]>
Commit | Line | Data |
---|---|---|
e440a328 | 1 | // expressions.cc -- Go frontend expression handling. |
2 | ||
3 | // Copyright 2009 The Go Authors. All rights reserved. | |
4 | // Use of this source code is governed by a BSD-style | |
5 | // license that can be found in the LICENSE file. | |
6 | ||
7 | #include "go-system.h" | |
8 | ||
ffe743ca | 9 | #include <algorithm> |
10 | ||
e440a328 | 11 | #include "go-c.h" |
12 | #include "gogo.h" | |
631d5788 | 13 | #include "go-diagnostics.h" |
438b4bec | 14 | #include "go-encode-id.h" |
e440a328 | 15 | #include "types.h" |
16 | #include "export.h" | |
17 | #include "import.h" | |
18 | #include "statements.h" | |
19 | #include "lex.h" | |
a9182619 | 20 | #include "runtime.h" |
6e193e6f | 21 | #include "backend.h" |
e440a328 | 22 | #include "expressions.h" |
d751bb78 | 23 | #include "ast-dump.h" |
e440a328 | 24 | |
25 | // Class Expression. | |
26 | ||
27 | Expression::Expression(Expression_classification classification, | |
b13c66cd | 28 | Location location) |
e440a328 | 29 | : classification_(classification), location_(location) |
30 | { | |
31 | } | |
32 | ||
33 | Expression::~Expression() | |
34 | { | |
35 | } | |
36 | ||
e440a328 | 37 | // Traverse the expressions. |
38 | ||
39 | int | |
40 | Expression::traverse(Expression** pexpr, Traverse* traverse) | |
41 | { | |
42 | Expression* expr = *pexpr; | |
43 | if ((traverse->traverse_mask() & Traverse::traverse_expressions) != 0) | |
44 | { | |
45 | int t = traverse->expression(pexpr); | |
46 | if (t == TRAVERSE_EXIT) | |
47 | return TRAVERSE_EXIT; | |
48 | else if (t == TRAVERSE_SKIP_COMPONENTS) | |
49 | return TRAVERSE_CONTINUE; | |
50 | } | |
51 | return expr->do_traverse(traverse); | |
52 | } | |
53 | ||
54 | // Traverse subexpressions of this expression. | |
55 | ||
56 | int | |
57 | Expression::traverse_subexpressions(Traverse* traverse) | |
58 | { | |
59 | return this->do_traverse(traverse); | |
60 | } | |
61 | ||
62 | // Default implementation for do_traverse for child classes. | |
63 | ||
64 | int | |
65 | Expression::do_traverse(Traverse*) | |
66 | { | |
67 | return TRAVERSE_CONTINUE; | |
68 | } | |
69 | ||
70 | // This virtual function is called by the parser if the value of this | |
a7549a6a | 71 | // expression is being discarded. By default, we give an error. |
72 | // Expressions with side effects override. | |
e440a328 | 73 | |
4f2138d7 | 74 | bool |
e440a328 | 75 | Expression::do_discarding_value() |
76 | { | |
a7549a6a | 77 | this->unused_value_error(); |
4f2138d7 | 78 | return false; |
e440a328 | 79 | } |
80 | ||
81 | // This virtual function is called to export expressions. This will | |
82 | // only be used by expressions which may be constant. | |
83 | ||
84 | void | |
548be246 | 85 | Expression::do_export(Export_function_body*) const |
e440a328 | 86 | { |
c3e6f413 | 87 | go_unreachable(); |
e440a328 | 88 | } |
89 | ||
015399f9 | 90 | // Write a name to the export data. |
91 | ||
92 | void | |
93 | Expression::export_name(Export_function_body* efb, const Named_object* no) | |
94 | { | |
95 | if (no->package() != NULL) | |
96 | { | |
97 | char buf[50]; | |
98 | snprintf(buf, sizeof buf, "<p%d>", efb->package_index(no->package())); | |
99 | efb->write_c_string(buf); | |
100 | } | |
101 | ||
102 | if (!Gogo::is_hidden_name(no->name())) | |
103 | efb->write_string(no->name()); | |
104 | else | |
105 | { | |
106 | efb->write_c_string("."); | |
107 | efb->write_string(Gogo::unpack_hidden_name(no->name())); | |
108 | } | |
109 | } | |
110 | ||
a7549a6a | 111 | // Give an error saying that the value of the expression is not used. |
e440a328 | 112 | |
113 | void | |
a7549a6a | 114 | Expression::unused_value_error() |
e440a328 | 115 | { |
4f2138d7 | 116 | this->report_error(_("value computed is not used")); |
e440a328 | 117 | } |
118 | ||
119 | // Note that this expression is an error. This is called by children | |
120 | // when they discover an error. | |
121 | ||
122 | void | |
123 | Expression::set_is_error() | |
124 | { | |
125 | this->classification_ = EXPRESSION_ERROR; | |
126 | } | |
127 | ||
128 | // For children to call to report an error conveniently. | |
129 | ||
130 | void | |
131 | Expression::report_error(const char* msg) | |
132 | { | |
631d5788 | 133 | go_error_at(this->location_, "%s", msg); |
e440a328 | 134 | this->set_is_error(); |
135 | } | |
136 | ||
137 | // Set types of variables and constants. This is implemented by the | |
138 | // child class. | |
139 | ||
140 | void | |
141 | Expression::determine_type(const Type_context* context) | |
142 | { | |
143 | this->do_determine_type(context); | |
144 | } | |
145 | ||
146 | // Set types when there is no context. | |
147 | ||
148 | void | |
149 | Expression::determine_type_no_context() | |
150 | { | |
151 | Type_context context; | |
152 | this->do_determine_type(&context); | |
153 | } | |
154 | ||
d3c55148 | 155 | // Return true if two expressions refer to the same variable or struct |
156 | // field. This can only be true when there are no side effects. | |
157 | ||
158 | bool | |
159 | Expression::is_same_variable(Expression* a, Expression* b) | |
160 | { | |
161 | if (a->classification() != b->classification()) | |
162 | return false; | |
163 | ||
164 | Var_expression* av = a->var_expression(); | |
165 | if (av != NULL) | |
166 | return av->named_object() == b->var_expression()->named_object(); | |
167 | ||
168 | Field_reference_expression* af = a->field_reference_expression(); | |
169 | if (af != NULL) | |
170 | { | |
171 | Field_reference_expression* bf = b->field_reference_expression(); | |
172 | return (af->field_index() == bf->field_index() | |
173 | && Expression::is_same_variable(af->expr(), bf->expr())); | |
174 | } | |
175 | ||
176 | Unary_expression* au = a->unary_expression(); | |
177 | if (au != NULL) | |
178 | { | |
179 | Unary_expression* bu = b->unary_expression(); | |
180 | return (au->op() == OPERATOR_MULT | |
181 | && bu->op() == OPERATOR_MULT | |
182 | && Expression::is_same_variable(au->operand(), | |
183 | bu->operand())); | |
184 | } | |
185 | ||
186 | return false; | |
187 | } | |
188 | ||
2c809f8f | 189 | // Return an expression handling any conversions which must be done during |
e440a328 | 190 | // assignment. |
191 | ||
2c809f8f | 192 | Expression* |
b4a33049 | 193 | Expression::convert_for_assignment(Gogo*, Type* lhs_type, |
2c809f8f | 194 | Expression* rhs, Location location) |
e440a328 | 195 | { |
2c809f8f | 196 | Type* rhs_type = rhs->type(); |
197 | if (lhs_type->is_error() | |
198 | || rhs_type->is_error() | |
199 | || rhs->is_error_expression()) | |
200 | return Expression::make_error(location); | |
e440a328 | 201 | |
3a522dcc | 202 | bool are_identical = Type::are_identical(lhs_type, rhs_type, |
203 | (Type::COMPARE_ERRORS | |
204 | | Type::COMPARE_TAGS), | |
205 | NULL); | |
22984631 | 206 | if (!are_identical && lhs_type->interface_type() != NULL) |
e440a328 | 207 | { |
e007b1eb | 208 | // Type to interface conversions have been made explicit early. |
209 | go_assert(rhs_type->interface_type() != NULL); | |
210 | return Expression::convert_interface_to_interface(lhs_type, rhs, false, | |
211 | location); | |
e440a328 | 212 | } |
22984631 | 213 | else if (!are_identical && rhs_type->interface_type() != NULL) |
2c809f8f | 214 | return Expression::convert_interface_to_type(lhs_type, rhs, location); |
411eb89e | 215 | else if (lhs_type->is_slice_type() && rhs_type->is_nil_type()) |
e440a328 | 216 | { |
2c809f8f | 217 | // Assigning nil to a slice. |
2c809f8f | 218 | Expression* nil = Expression::make_nil(location); |
e67508fa | 219 | Expression* zero = Expression::make_integer_ul(0, NULL, location); |
2c809f8f | 220 | return Expression::make_slice_value(lhs_type, nil, zero, zero, location); |
e440a328 | 221 | } |
222 | else if (rhs_type->is_nil_type()) | |
2c809f8f | 223 | return Expression::make_nil(location); |
22984631 | 224 | else if (are_identical) |
e440a328 | 225 | { |
22984631 | 226 | if (lhs_type->forwarded() != rhs_type->forwarded()) |
227 | { | |
228 | // Different but identical types require an explicit | |
229 | // conversion. This happens with type aliases. | |
230 | return Expression::make_cast(lhs_type, rhs, location); | |
231 | } | |
232 | ||
e440a328 | 233 | // No conversion is needed. |
2c809f8f | 234 | return rhs; |
235 | } | |
236 | else if (lhs_type->points_to() != NULL) | |
237 | return Expression::make_unsafe_cast(lhs_type, rhs, location); | |
238 | else if (lhs_type->is_numeric_type()) | |
239 | return Expression::make_cast(lhs_type, rhs, location); | |
240 | else if ((lhs_type->struct_type() != NULL | |
241 | && rhs_type->struct_type() != NULL) | |
242 | || (lhs_type->array_type() != NULL | |
243 | && rhs_type->array_type() != NULL)) | |
e440a328 | 244 | { |
245 | // This conversion must be permitted by Go, or we wouldn't have | |
246 | // gotten here. | |
2c809f8f | 247 | return Expression::make_unsafe_cast(lhs_type, rhs, location); |
e440a328 | 248 | } |
249 | else | |
2c809f8f | 250 | return rhs; |
e440a328 | 251 | } |
252 | ||
2c809f8f | 253 | // Return an expression for a conversion from a non-interface type to an |
e007b1eb | 254 | // interface type. If ON_STACK is true, it can allocate the storage on |
255 | // stack. | |
e440a328 | 256 | |
2c809f8f | 257 | Expression* |
258 | Expression::convert_type_to_interface(Type* lhs_type, Expression* rhs, | |
e007b1eb | 259 | bool on_stack, Location location) |
e440a328 | 260 | { |
e440a328 | 261 | Interface_type* lhs_interface_type = lhs_type->interface_type(); |
262 | bool lhs_is_empty = lhs_interface_type->is_empty(); | |
263 | ||
264 | // Since RHS_TYPE is a static type, we can create the interface | |
265 | // method table at compile time. | |
266 | ||
267 | // When setting an interface to nil, we just set both fields to | |
268 | // NULL. | |
2c809f8f | 269 | Type* rhs_type = rhs->type(); |
e440a328 | 270 | if (rhs_type->is_nil_type()) |
63697958 | 271 | { |
2c809f8f | 272 | Expression* nil = Expression::make_nil(location); |
273 | return Expression::make_interface_value(lhs_type, nil, nil, location); | |
63697958 | 274 | } |
e440a328 | 275 | |
276 | // This should have been checked already. | |
2b8629dd | 277 | if (!lhs_interface_type->implements_interface(rhs_type, NULL)) |
278 | { | |
279 | go_assert(saw_errors()); | |
280 | return Expression::make_error(location); | |
281 | } | |
e440a328 | 282 | |
e440a328 | 283 | // An interface is a tuple. If LHS_TYPE is an empty interface type, |
284 | // then the first field is the type descriptor for RHS_TYPE. | |
285 | // Otherwise it is the interface method table for RHS_TYPE. | |
2c809f8f | 286 | Expression* first_field; |
e440a328 | 287 | if (lhs_is_empty) |
2c809f8f | 288 | first_field = Expression::make_type_descriptor(rhs_type, location); |
e440a328 | 289 | else |
290 | { | |
291 | // Build the interface method table for this interface and this | |
292 | // object type: a list of function pointers for each interface | |
293 | // method. | |
294 | Named_type* rhs_named_type = rhs_type->named_type(); | |
c0cab2ec | 295 | Struct_type* rhs_struct_type = rhs_type->struct_type(); |
e440a328 | 296 | bool is_pointer = false; |
c0cab2ec | 297 | if (rhs_named_type == NULL && rhs_struct_type == NULL) |
e440a328 | 298 | { |
299 | rhs_named_type = rhs_type->deref()->named_type(); | |
c0cab2ec | 300 | rhs_struct_type = rhs_type->deref()->struct_type(); |
e440a328 | 301 | is_pointer = true; |
302 | } | |
c0cab2ec | 303 | if (rhs_named_type != NULL) |
2c809f8f | 304 | first_field = |
305 | rhs_named_type->interface_method_table(lhs_interface_type, | |
306 | is_pointer); | |
c0cab2ec | 307 | else if (rhs_struct_type != NULL) |
2c809f8f | 308 | first_field = |
309 | rhs_struct_type->interface_method_table(lhs_interface_type, | |
310 | is_pointer); | |
c0cab2ec | 311 | else |
2c809f8f | 312 | first_field = Expression::make_nil(location); |
e440a328 | 313 | } |
e440a328 | 314 | |
2c809f8f | 315 | Expression* obj; |
5b665222 | 316 | if (rhs_type->is_direct_iface_type()) |
e440a328 | 317 | { |
2c809f8f | 318 | // We are assigning a pointer to the interface; the interface |
e440a328 | 319 | // holds the pointer itself. |
5b665222 | 320 | obj = unpack_direct_iface(rhs, location); |
2c809f8f | 321 | } |
322 | else | |
323 | { | |
324 | // We are assigning a non-pointer value to the interface; the | |
45ff893b | 325 | // interface gets a copy of the value in the heap if it escapes. |
e47edcf7 | 326 | if (rhs->is_constant()) |
327 | obj = Expression::make_unary(OPERATOR_AND, rhs, location); | |
328 | else | |
329 | { | |
330 | obj = Expression::make_heap_expression(rhs, location); | |
331 | if (on_stack) | |
332 | obj->heap_expression()->set_allocate_on_stack(); | |
333 | } | |
e440a328 | 334 | } |
335 | ||
2c809f8f | 336 | return Expression::make_interface_value(lhs_type, first_field, obj, location); |
337 | } | |
e440a328 | 338 | |
5b665222 | 339 | // Return an expression for the pointer-typed value of a direct interface |
340 | // type. Specifically, for single field struct or array, get the single | |
341 | // field, and do this recursively. The reason for this is that we don't | |
342 | // want to assign a struct or an array to a pointer-typed field. The | |
343 | // backend may not like that. | |
344 | ||
345 | Expression* | |
346 | Expression::unpack_direct_iface(Expression* rhs, Location loc) | |
347 | { | |
348 | Struct_type* st = rhs->type()->struct_type(); | |
349 | if (st != NULL) | |
350 | { | |
351 | go_assert(st->field_count() == 1); | |
352 | Expression* field = Expression::make_field_reference(rhs, 0, loc); | |
353 | return unpack_direct_iface(field, loc); | |
354 | } | |
355 | Array_type* at = rhs->type()->array_type(); | |
356 | if (at != NULL) | |
357 | { | |
358 | int64_t len; | |
359 | bool ok = at->int_length(&len); | |
360 | go_assert(ok && len == 1); | |
361 | Type* int_type = Type::lookup_integer_type("int"); | |
362 | Expression* index = Expression::make_integer_ul(0, int_type, loc); | |
363 | Expression* elem = Expression::make_array_index(rhs, index, NULL, NULL, loc); | |
364 | return unpack_direct_iface(elem, loc); | |
365 | } | |
366 | return rhs; | |
367 | } | |
368 | ||
369 | // The opposite of unpack_direct_iface. | |
370 | ||
371 | Expression* | |
372 | Expression::pack_direct_iface(Type* t, Expression* rhs, Location loc) | |
373 | { | |
374 | if (rhs->type() == t) | |
375 | return rhs; | |
376 | Struct_type* st = t->struct_type(); | |
377 | if (st != NULL) | |
378 | { | |
379 | Expression_list* vals = new Expression_list(); | |
380 | vals->push_back(pack_direct_iface(st->field(0)->type(), rhs, loc)); | |
381 | return Expression::make_struct_composite_literal(t, vals, loc); | |
382 | } | |
383 | Array_type* at = t->array_type(); | |
384 | if (at != NULL) | |
385 | { | |
386 | Expression_list* vals = new Expression_list(); | |
387 | vals->push_back(pack_direct_iface(at->element_type(), rhs, loc)); | |
388 | return Expression::make_array_composite_literal(t, vals, loc); | |
389 | } | |
390 | return Expression::make_unsafe_cast(t, rhs, loc); | |
391 | } | |
392 | ||
2c809f8f | 393 | // Return an expression for the type descriptor of RHS. |
e440a328 | 394 | |
2c809f8f | 395 | Expression* |
396 | Expression::get_interface_type_descriptor(Expression* rhs) | |
397 | { | |
398 | go_assert(rhs->type()->interface_type() != NULL); | |
399 | Location location = rhs->location(); | |
e440a328 | 400 | |
2c809f8f | 401 | // The type descriptor is the first field of an empty interface. |
402 | if (rhs->type()->interface_type()->is_empty()) | |
403 | return Expression::make_interface_info(rhs, INTERFACE_INFO_TYPE_DESCRIPTOR, | |
404 | location); | |
405 | ||
406 | Expression* mtable = | |
407 | Expression::make_interface_info(rhs, INTERFACE_INFO_METHODS, location); | |
e440a328 | 408 | |
2c809f8f | 409 | Expression* descriptor = |
f614ea8b | 410 | Expression::make_dereference(mtable, NIL_CHECK_NOT_NEEDED, location); |
2c809f8f | 411 | descriptor = Expression::make_field_reference(descriptor, 0, location); |
412 | Expression* nil = Expression::make_nil(location); | |
e440a328 | 413 | |
2c809f8f | 414 | Expression* eq = |
415 | Expression::make_binary(OPERATOR_EQEQ, mtable, nil, location); | |
416 | return Expression::make_conditional(eq, nil, descriptor, location); | |
e440a328 | 417 | } |
418 | ||
2c809f8f | 419 | // Return an expression for the conversion of an interface type to an |
e440a328 | 420 | // interface type. |
421 | ||
2c809f8f | 422 | Expression* |
423 | Expression::convert_interface_to_interface(Type *lhs_type, Expression* rhs, | |
424 | bool for_type_guard, | |
425 | Location location) | |
e440a328 | 426 | { |
3a522dcc | 427 | if (Type::are_identical(lhs_type, rhs->type(), |
428 | Type::COMPARE_ERRORS | Type::COMPARE_TAGS, | |
429 | NULL)) | |
8ba8cc87 | 430 | return rhs; |
431 | ||
e440a328 | 432 | Interface_type* lhs_interface_type = lhs_type->interface_type(); |
433 | bool lhs_is_empty = lhs_interface_type->is_empty(); | |
434 | ||
e440a328 | 435 | // In the general case this requires runtime examination of the type |
436 | // method table to match it up with the interface methods. | |
437 | ||
438 | // FIXME: If all of the methods in the right hand side interface | |
439 | // also appear in the left hand side interface, then we don't need | |
440 | // to do a runtime check, although we still need to build a new | |
441 | // method table. | |
442 | ||
8ba8cc87 | 443 | // We are going to evaluate RHS multiple times. |
444 | go_assert(rhs->is_variable()); | |
445 | ||
e440a328 | 446 | // Get the type descriptor for the right hand side. This will be |
447 | // NULL for a nil interface. | |
2c809f8f | 448 | Expression* rhs_type_expr = Expression::get_interface_type_descriptor(rhs); |
449 | Expression* lhs_type_expr = | |
450 | Expression::make_type_descriptor(lhs_type, location); | |
e440a328 | 451 | |
2c809f8f | 452 | Expression* first_field; |
e440a328 | 453 | if (for_type_guard) |
454 | { | |
455 | // A type assertion fails when converting a nil interface. | |
6098d6cb | 456 | first_field = Runtime::make_call(Runtime::ASSERTITAB, location, 2, |
457 | lhs_type_expr, rhs_type_expr); | |
e440a328 | 458 | } |
459 | else if (lhs_is_empty) | |
460 | { | |
2c809f8f | 461 | // A conversion to an empty interface always succeeds, and the |
e440a328 | 462 | // first field is just the type descriptor of the object. |
2c809f8f | 463 | first_field = rhs_type_expr; |
e440a328 | 464 | } |
465 | else | |
466 | { | |
467 | // A conversion to a non-empty interface may fail, but unlike a | |
468 | // type assertion converting nil will always succeed. | |
6098d6cb | 469 | first_field = Runtime::make_call(Runtime::REQUIREITAB, location, 2, |
470 | lhs_type_expr, rhs_type_expr); | |
e440a328 | 471 | } |
472 | ||
473 | // The second field is simply the object pointer. | |
2c809f8f | 474 | Expression* obj = |
475 | Expression::make_interface_info(rhs, INTERFACE_INFO_OBJECT, location); | |
476 | return Expression::make_interface_value(lhs_type, first_field, obj, location); | |
e440a328 | 477 | } |
478 | ||
2c809f8f | 479 | // Return an expression for the conversion of an interface type to a |
e440a328 | 480 | // non-interface type. |
481 | ||
2c809f8f | 482 | Expression* |
483 | Expression::convert_interface_to_type(Type *lhs_type, Expression* rhs, | |
484 | Location location) | |
e440a328 | 485 | { |
8ba8cc87 | 486 | // We are going to evaluate RHS multiple times. |
487 | go_assert(rhs->is_variable()); | |
488 | ||
ff736f11 | 489 | // Build an expression to check that the type is valid. It will |
490 | // panic with an appropriate runtime type error if the type is not | |
491 | // valid. | |
492 | // (lhs_type != rhs_type ? panicdottype(lhs_type, rhs_type, inter_type) : | |
493 | // nil /*dummy*/) | |
2c809f8f | 494 | Expression* lhs_type_expr = Expression::make_type_descriptor(lhs_type, |
495 | location); | |
496 | Expression* rhs_descriptor = | |
497 | Expression::get_interface_type_descriptor(rhs); | |
498 | ||
499 | Type* rhs_type = rhs->type(); | |
500 | Expression* rhs_inter_expr = Expression::make_type_descriptor(rhs_type, | |
501 | location); | |
502 | ||
ff736f11 | 503 | Expression* cond = Expression::make_binary(OPERATOR_NOTEQ, lhs_type_expr, |
504 | rhs_descriptor, location); | |
505 | rhs_descriptor = Expression::get_interface_type_descriptor(rhs); | |
506 | Expression* panic = Runtime::make_call(Runtime::PANICDOTTYPE, location, | |
507 | 3, lhs_type_expr->copy(), | |
508 | rhs_descriptor, | |
509 | rhs_inter_expr); | |
510 | Expression* nil = Expression::make_nil(location); | |
511 | Expression* check = Expression::make_conditional(cond, panic, nil, | |
512 | location); | |
e440a328 | 513 | |
ff736f11 | 514 | // If the conversion succeeds, pull out the value. |
2c809f8f | 515 | Expression* obj = Expression::make_interface_info(rhs, INTERFACE_INFO_OBJECT, |
516 | location); | |
e440a328 | 517 | |
5b665222 | 518 | // If the value is a direct interface, then it is the value we want. |
e440a328 | 519 | // Otherwise it points to the value. |
5b665222 | 520 | if (lhs_type->is_direct_iface_type()) |
521 | obj = Expression::pack_direct_iface(lhs_type, obj, location); | |
522 | else | |
e440a328 | 523 | { |
2c809f8f | 524 | obj = Expression::make_unsafe_cast(Type::make_pointer_type(lhs_type), obj, |
525 | location); | |
f614ea8b | 526 | obj = Expression::make_dereference(obj, NIL_CHECK_NOT_NEEDED, |
527 | location); | |
e440a328 | 528 | } |
ff736f11 | 529 | return Expression::make_compound(check, obj, location); |
e440a328 | 530 | } |
531 | ||
ea664253 | 532 | // Convert an expression to its backend representation. This is implemented by |
533 | // the child class. Not that it is not in general safe to call this multiple | |
e440a328 | 534 | // times for a single expression, but that we don't catch such errors. |
535 | ||
ea664253 | 536 | Bexpression* |
537 | Expression::get_backend(Translate_context* context) | |
e440a328 | 538 | { |
539 | // The child may have marked this expression as having an error. | |
540 | if (this->classification_ == EXPRESSION_ERROR) | |
ea664253 | 541 | return context->backend()->error_expression(); |
e440a328 | 542 | |
ea664253 | 543 | return this->do_get_backend(context); |
e440a328 | 544 | } |
545 | ||
48c2a53a | 546 | // Return a backend expression for VAL. |
547 | Bexpression* | |
548 | Expression::backend_numeric_constant_expression(Translate_context* context, | |
549 | Numeric_constant* val) | |
e440a328 | 550 | { |
48c2a53a | 551 | Gogo* gogo = context->gogo(); |
552 | Type* type = val->type(); | |
553 | if (type == NULL) | |
554 | return gogo->backend()->error_expression(); | |
e440a328 | 555 | |
48c2a53a | 556 | Btype* btype = type->get_backend(gogo); |
557 | Bexpression* ret; | |
558 | if (type->integer_type() != NULL) | |
e440a328 | 559 | { |
560 | mpz_t ival; | |
48c2a53a | 561 | if (!val->to_int(&ival)) |
562 | { | |
563 | go_assert(saw_errors()); | |
564 | return gogo->backend()->error_expression(); | |
565 | } | |
566 | ret = gogo->backend()->integer_constant_expression(btype, ival); | |
e440a328 | 567 | mpz_clear(ival); |
e440a328 | 568 | } |
48c2a53a | 569 | else if (type->float_type() != NULL) |
e440a328 | 570 | { |
48c2a53a | 571 | mpfr_t fval; |
572 | if (!val->to_float(&fval)) | |
573 | { | |
574 | go_assert(saw_errors()); | |
575 | return gogo->backend()->error_expression(); | |
576 | } | |
577 | ret = gogo->backend()->float_constant_expression(btype, fval); | |
578 | mpfr_clear(fval); | |
e440a328 | 579 | } |
48c2a53a | 580 | else if (type->complex_type() != NULL) |
e440a328 | 581 | { |
fcbea5e4 | 582 | mpc_t cval; |
583 | if (!val->to_complex(&cval)) | |
48c2a53a | 584 | { |
585 | go_assert(saw_errors()); | |
586 | return gogo->backend()->error_expression(); | |
587 | } | |
fcbea5e4 | 588 | ret = gogo->backend()->complex_constant_expression(btype, cval); |
589 | mpc_clear(cval); | |
e440a328 | 590 | } |
591 | else | |
c3e6f413 | 592 | go_unreachable(); |
e440a328 | 593 | |
48c2a53a | 594 | return ret; |
e440a328 | 595 | } |
596 | ||
2c809f8f | 597 | // Return an expression which evaluates to true if VAL, of arbitrary integer |
598 | // type, is negative or is more than the maximum value of the Go type "int". | |
e440a328 | 599 | |
2c809f8f | 600 | Expression* |
601 | Expression::check_bounds(Expression* val, Location loc) | |
e440a328 | 602 | { |
2c809f8f | 603 | Type* val_type = val->type(); |
604 | Type* bound_type = Type::lookup_integer_type("int"); | |
605 | ||
606 | int val_type_size; | |
607 | bool val_is_unsigned = false; | |
608 | if (val_type->integer_type() != NULL) | |
609 | { | |
610 | val_type_size = val_type->integer_type()->bits(); | |
611 | val_is_unsigned = val_type->integer_type()->is_unsigned(); | |
612 | } | |
613 | else | |
614 | { | |
615 | if (!val_type->is_numeric_type() | |
616 | || !Type::are_convertible(bound_type, val_type, NULL)) | |
617 | { | |
618 | go_assert(saw_errors()); | |
619 | return Expression::make_boolean(true, loc); | |
620 | } | |
e440a328 | 621 | |
2c809f8f | 622 | if (val_type->complex_type() != NULL) |
623 | val_type_size = val_type->complex_type()->bits(); | |
624 | else | |
625 | val_type_size = val_type->float_type()->bits(); | |
626 | } | |
627 | ||
628 | Expression* negative_index = Expression::make_boolean(false, loc); | |
629 | Expression* index_overflows = Expression::make_boolean(false, loc); | |
630 | if (!val_is_unsigned) | |
e440a328 | 631 | { |
e67508fa | 632 | Expression* zero = Expression::make_integer_ul(0, val_type, loc); |
2c809f8f | 633 | negative_index = Expression::make_binary(OPERATOR_LT, val, zero, loc); |
e440a328 | 634 | } |
635 | ||
2c809f8f | 636 | int bound_type_size = bound_type->integer_type()->bits(); |
c3068ac0 | 637 | if (val_type_size > bound_type_size |
638 | || (val_type_size == bound_type_size | |
2c809f8f | 639 | && val_is_unsigned)) |
640 | { | |
641 | mpz_t one; | |
642 | mpz_init_set_ui(one, 1UL); | |
643 | ||
644 | // maxval = 2^(bound_type_size - 1) - 1 | |
645 | mpz_t maxval; | |
646 | mpz_init(maxval); | |
647 | mpz_mul_2exp(maxval, one, bound_type_size - 1); | |
648 | mpz_sub_ui(maxval, maxval, 1); | |
e67508fa | 649 | Expression* max = Expression::make_integer_z(&maxval, val_type, loc); |
2c809f8f | 650 | mpz_clear(one); |
651 | mpz_clear(maxval); | |
652 | ||
653 | index_overflows = Expression::make_binary(OPERATOR_GT, val, max, loc); | |
e440a328 | 654 | } |
655 | ||
2c809f8f | 656 | return Expression::make_binary(OPERATOR_OROR, negative_index, index_overflows, |
657 | loc); | |
e440a328 | 658 | } |
659 | ||
d751bb78 | 660 | void |
661 | Expression::dump_expression(Ast_dump_context* ast_dump_context) const | |
662 | { | |
663 | this->do_dump_expression(ast_dump_context); | |
664 | } | |
665 | ||
e440a328 | 666 | // Error expressions. This are used to avoid cascading errors. |
667 | ||
668 | class Error_expression : public Expression | |
669 | { | |
670 | public: | |
b13c66cd | 671 | Error_expression(Location location) |
e440a328 | 672 | : Expression(EXPRESSION_ERROR, location) |
673 | { } | |
674 | ||
675 | protected: | |
676 | bool | |
677 | do_is_constant() const | |
678 | { return true; } | |
679 | ||
680 | bool | |
0c77715b | 681 | do_numeric_constant_value(Numeric_constant* nc) const |
e440a328 | 682 | { |
0c77715b | 683 | nc->set_unsigned_long(NULL, 0); |
e440a328 | 684 | return true; |
685 | } | |
686 | ||
4f2138d7 | 687 | bool |
e440a328 | 688 | do_discarding_value() |
4f2138d7 | 689 | { return true; } |
e440a328 | 690 | |
691 | Type* | |
692 | do_type() | |
693 | { return Type::make_error_type(); } | |
694 | ||
695 | void | |
696 | do_determine_type(const Type_context*) | |
697 | { } | |
698 | ||
699 | Expression* | |
700 | do_copy() | |
701 | { return this; } | |
702 | ||
703 | bool | |
704 | do_is_addressable() const | |
705 | { return true; } | |
706 | ||
ea664253 | 707 | Bexpression* |
708 | do_get_backend(Translate_context* context) | |
709 | { return context->backend()->error_expression(); } | |
d751bb78 | 710 | |
711 | void | |
712 | do_dump_expression(Ast_dump_context*) const; | |
e440a328 | 713 | }; |
714 | ||
d751bb78 | 715 | // Dump the ast representation for an error expression to a dump context. |
716 | ||
717 | void | |
718 | Error_expression::do_dump_expression(Ast_dump_context* ast_dump_context) const | |
719 | { | |
720 | ast_dump_context->ostream() << "_Error_" ; | |
721 | } | |
722 | ||
e440a328 | 723 | Expression* |
b13c66cd | 724 | Expression::make_error(Location location) |
e440a328 | 725 | { |
726 | return new Error_expression(location); | |
727 | } | |
728 | ||
729 | // An expression which is really a type. This is used during parsing. | |
730 | // It is an error if these survive after lowering. | |
731 | ||
732 | class | |
733 | Type_expression : public Expression | |
734 | { | |
735 | public: | |
b13c66cd | 736 | Type_expression(Type* type, Location location) |
e440a328 | 737 | : Expression(EXPRESSION_TYPE, location), |
738 | type_(type) | |
739 | { } | |
740 | ||
741 | protected: | |
742 | int | |
743 | do_traverse(Traverse* traverse) | |
744 | { return Type::traverse(this->type_, traverse); } | |
745 | ||
746 | Type* | |
747 | do_type() | |
748 | { return this->type_; } | |
749 | ||
750 | void | |
751 | do_determine_type(const Type_context*) | |
752 | { } | |
753 | ||
754 | void | |
755 | do_check_types(Gogo*) | |
756 | { this->report_error(_("invalid use of type")); } | |
757 | ||
758 | Expression* | |
759 | do_copy() | |
760 | { return this; } | |
761 | ||
ea664253 | 762 | Bexpression* |
763 | do_get_backend(Translate_context*) | |
c3e6f413 | 764 | { go_unreachable(); } |
e440a328 | 765 | |
d751bb78 | 766 | void do_dump_expression(Ast_dump_context*) const; |
f03a9fbf | 767 | |
e440a328 | 768 | private: |
769 | // The type which we are representing as an expression. | |
770 | Type* type_; | |
771 | }; | |
772 | ||
d751bb78 | 773 | void |
774 | Type_expression::do_dump_expression(Ast_dump_context* ast_dump_context) const | |
775 | { | |
776 | ast_dump_context->dump_type(this->type_); | |
777 | } | |
778 | ||
e440a328 | 779 | Expression* |
b13c66cd | 780 | Expression::make_type(Type* type, Location location) |
e440a328 | 781 | { |
782 | return new Type_expression(type, location); | |
783 | } | |
784 | ||
e03bdf36 | 785 | // Class Parser_expression. |
786 | ||
787 | Type* | |
788 | Parser_expression::do_type() | |
789 | { | |
790 | // We should never really ask for the type of a Parser_expression. | |
791 | // However, it can happen, at least when we have an invalid const | |
792 | // whose initializer refers to the const itself. In that case we | |
793 | // may ask for the type when lowering the const itself. | |
c484d925 | 794 | go_assert(saw_errors()); |
e03bdf36 | 795 | return Type::make_error_type(); |
796 | } | |
797 | ||
e440a328 | 798 | // Class Var_expression. |
799 | ||
800 | // Lower a variable expression. Here we just make sure that the | |
801 | // initialization expression of the variable has been lowered. This | |
802 | // ensures that we will be able to determine the type of the variable | |
803 | // if necessary. | |
804 | ||
805 | Expression* | |
ceeb4318 | 806 | Var_expression::do_lower(Gogo* gogo, Named_object* function, |
807 | Statement_inserter* inserter, int) | |
e440a328 | 808 | { |
809 | if (this->variable_->is_variable()) | |
810 | { | |
811 | Variable* var = this->variable_->var_value(); | |
812 | // This is either a local variable or a global variable. A | |
813 | // reference to a variable which is local to an enclosing | |
814 | // function will be a reference to a field in a closure. | |
815 | if (var->is_global()) | |
ceeb4318 | 816 | { |
817 | function = NULL; | |
818 | inserter = NULL; | |
819 | } | |
820 | var->lower_init_expression(gogo, function, inserter); | |
e440a328 | 821 | } |
822 | return this; | |
823 | } | |
824 | ||
e440a328 | 825 | // Return the type of a reference to a variable. |
826 | ||
827 | Type* | |
828 | Var_expression::do_type() | |
829 | { | |
830 | if (this->variable_->is_variable()) | |
831 | return this->variable_->var_value()->type(); | |
832 | else if (this->variable_->is_result_variable()) | |
833 | return this->variable_->result_var_value()->type(); | |
834 | else | |
c3e6f413 | 835 | go_unreachable(); |
e440a328 | 836 | } |
837 | ||
0ab09e06 | 838 | // Determine the type of a reference to a variable. |
839 | ||
840 | void | |
841 | Var_expression::do_determine_type(const Type_context*) | |
842 | { | |
843 | if (this->variable_->is_variable()) | |
844 | this->variable_->var_value()->determine_type(); | |
845 | } | |
846 | ||
e440a328 | 847 | // Something takes the address of this variable. This means that we |
848 | // may want to move the variable onto the heap. | |
849 | ||
850 | void | |
851 | Var_expression::do_address_taken(bool escapes) | |
852 | { | |
853 | if (!escapes) | |
f325319b | 854 | { |
855 | if (this->variable_->is_variable()) | |
856 | this->variable_->var_value()->set_non_escaping_address_taken(); | |
857 | else if (this->variable_->is_result_variable()) | |
858 | this->variable_->result_var_value()->set_non_escaping_address_taken(); | |
859 | else | |
860 | go_unreachable(); | |
861 | } | |
e440a328 | 862 | else |
f325319b | 863 | { |
864 | if (this->variable_->is_variable()) | |
865 | this->variable_->var_value()->set_address_taken(); | |
866 | else if (this->variable_->is_result_variable()) | |
867 | this->variable_->result_var_value()->set_address_taken(); | |
868 | else | |
869 | go_unreachable(); | |
870 | } | |
45ff893b | 871 | |
872 | if (this->variable_->is_variable() | |
873 | && this->variable_->var_value()->is_in_heap()) | |
874 | { | |
875 | Node::make_node(this)->set_encoding(Node::ESCAPE_HEAP); | |
876 | Node::make_node(this->variable_)->set_encoding(Node::ESCAPE_HEAP); | |
877 | } | |
e440a328 | 878 | } |
879 | ||
5f6f5357 | 880 | // Export a reference to a variable. |
881 | ||
882 | void | |
883 | Var_expression::do_export(Export_function_body* efb) const | |
884 | { | |
015399f9 | 885 | Named_object* no = this->variable_; |
886 | if (no->is_result_variable() || !no->var_value()->is_global()) | |
887 | efb->write_string(Gogo::unpack_hidden_name(no->name())); | |
888 | else | |
889 | Expression::export_name(efb, no); | |
5f6f5357 | 890 | } |
891 | ||
ea664253 | 892 | // Get the backend representation for a reference to a variable. |
e440a328 | 893 | |
ea664253 | 894 | Bexpression* |
895 | Var_expression::do_get_backend(Translate_context* context) | |
e440a328 | 896 | { |
fe2f84cf | 897 | Bvariable* bvar = this->variable_->get_backend_variable(context->gogo(), |
898 | context->function()); | |
fe2f84cf | 899 | bool is_in_heap; |
c6777780 | 900 | Location loc = this->location(); |
9b27b43c | 901 | Btype* btype; |
902 | Gogo* gogo = context->gogo(); | |
fe2f84cf | 903 | if (this->variable_->is_variable()) |
9b27b43c | 904 | { |
905 | is_in_heap = this->variable_->var_value()->is_in_heap(); | |
906 | btype = this->variable_->var_value()->type()->get_backend(gogo); | |
907 | } | |
fe2f84cf | 908 | else if (this->variable_->is_result_variable()) |
9b27b43c | 909 | { |
910 | is_in_heap = this->variable_->result_var_value()->is_in_heap(); | |
911 | btype = this->variable_->result_var_value()->type()->get_backend(gogo); | |
912 | } | |
fe2f84cf | 913 | else |
c3e6f413 | 914 | go_unreachable(); |
c6777780 | 915 | |
d4e6573e | 916 | Bexpression* ret = |
7af8e400 | 917 | context->backend()->var_expression(bvar, loc); |
fe2f84cf | 918 | if (is_in_heap) |
9b27b43c | 919 | ret = context->backend()->indirect_expression(btype, ret, true, loc); |
ea664253 | 920 | return ret; |
e440a328 | 921 | } |
922 | ||
d751bb78 | 923 | // Ast dump for variable expression. |
924 | ||
925 | void | |
926 | Var_expression::do_dump_expression(Ast_dump_context* ast_dump_context) const | |
927 | { | |
cd5e24c1 | 928 | ast_dump_context->ostream() << this->variable_->message_name() ; |
d751bb78 | 929 | } |
930 | ||
e440a328 | 931 | // Make a reference to a variable in an expression. |
932 | ||
933 | Expression* | |
b13c66cd | 934 | Expression::make_var_reference(Named_object* var, Location location) |
e440a328 | 935 | { |
936 | if (var->is_sink()) | |
937 | return Expression::make_sink(location); | |
938 | ||
939 | // FIXME: Creating a new object for each reference to a variable is | |
940 | // wasteful. | |
941 | return new Var_expression(var, location); | |
942 | } | |
943 | ||
b0c09712 | 944 | // Class Enclosed_var_expression. |
945 | ||
946 | int | |
947 | Enclosed_var_expression::do_traverse(Traverse*) | |
948 | { | |
949 | return TRAVERSE_CONTINUE; | |
950 | } | |
951 | ||
952 | // Lower the reference to the enclosed variable. | |
953 | ||
954 | Expression* | |
955 | Enclosed_var_expression::do_lower(Gogo* gogo, Named_object* function, | |
956 | Statement_inserter* inserter, int) | |
957 | { | |
958 | gogo->lower_expression(function, inserter, &this->reference_); | |
959 | return this; | |
960 | } | |
961 | ||
962 | // Flatten the reference to the enclosed variable. | |
963 | ||
964 | Expression* | |
965 | Enclosed_var_expression::do_flatten(Gogo* gogo, Named_object* function, | |
966 | Statement_inserter* inserter) | |
967 | { | |
968 | gogo->flatten_expression(function, inserter, &this->reference_); | |
969 | return this; | |
970 | } | |
971 | ||
972 | void | |
973 | Enclosed_var_expression::do_address_taken(bool escapes) | |
974 | { | |
975 | if (!escapes) | |
976 | { | |
977 | if (this->variable_->is_variable()) | |
978 | this->variable_->var_value()->set_non_escaping_address_taken(); | |
979 | else if (this->variable_->is_result_variable()) | |
980 | this->variable_->result_var_value()->set_non_escaping_address_taken(); | |
981 | else | |
982 | go_unreachable(); | |
983 | } | |
984 | else | |
985 | { | |
986 | if (this->variable_->is_variable()) | |
987 | this->variable_->var_value()->set_address_taken(); | |
988 | else if (this->variable_->is_result_variable()) | |
989 | this->variable_->result_var_value()->set_address_taken(); | |
990 | else | |
991 | go_unreachable(); | |
992 | } | |
45ff893b | 993 | |
994 | if (this->variable_->is_variable() | |
995 | && this->variable_->var_value()->is_in_heap()) | |
996 | Node::make_node(this->variable_)->set_encoding(Node::ESCAPE_HEAP); | |
b0c09712 | 997 | } |
998 | ||
999 | // Ast dump for enclosed variable expression. | |
1000 | ||
1001 | void | |
1002 | Enclosed_var_expression::do_dump_expression(Ast_dump_context* adc) const | |
1003 | { | |
cd5e24c1 | 1004 | adc->ostream() << this->variable_->message_name(); |
b0c09712 | 1005 | } |
1006 | ||
1007 | // Make a reference to a variable within an enclosing function. | |
1008 | ||
1009 | Expression* | |
1010 | Expression::make_enclosing_var_reference(Expression* reference, | |
1011 | Named_object* var, Location location) | |
1012 | { | |
1013 | return new Enclosed_var_expression(reference, var, location); | |
1014 | } | |
1015 | ||
e440a328 | 1016 | // Class Temporary_reference_expression. |
1017 | ||
1018 | // The type. | |
1019 | ||
1020 | Type* | |
1021 | Temporary_reference_expression::do_type() | |
1022 | { | |
1023 | return this->statement_->type(); | |
1024 | } | |
1025 | ||
1026 | // Called if something takes the address of this temporary variable. | |
1027 | // We never have to move temporary variables to the heap, but we do | |
1028 | // need to know that they must live in the stack rather than in a | |
1029 | // register. | |
1030 | ||
1031 | void | |
1032 | Temporary_reference_expression::do_address_taken(bool) | |
1033 | { | |
1034 | this->statement_->set_is_address_taken(); | |
1035 | } | |
1036 | ||
f6492beb | 1037 | // Export a reference to a temporary. |
1038 | ||
1039 | void | |
1040 | Temporary_reference_expression::do_export(Export_function_body* efb) const | |
1041 | { | |
1042 | unsigned int idx = efb->temporary_index(this->statement_); | |
1043 | char buf[50]; | |
1044 | snprintf(buf, sizeof buf, "$t%u", idx); | |
1045 | efb->write_c_string(buf); | |
1046 | } | |
1047 | ||
1048 | // Import a reference to a temporary. | |
1049 | ||
1050 | Expression* | |
1051 | Temporary_reference_expression::do_import(Import_function_body* ifb, | |
1052 | Location loc) | |
1053 | { | |
1054 | std::string id = ifb->read_identifier(); | |
1055 | go_assert(id[0] == '$' && id[1] == 't'); | |
1056 | const char *p = id.c_str(); | |
1057 | char *end; | |
1058 | long idx = strtol(p + 2, &end, 10); | |
1059 | if (*end != '\0' || idx > 0x7fffffff) | |
1060 | { | |
1061 | if (!ifb->saw_error()) | |
1062 | go_error_at(loc, | |
1063 | ("invalid export data for %qs: " | |
1064 | "invalid temporary reference index at %lu"), | |
1065 | ifb->name().c_str(), | |
1066 | static_cast<unsigned long>(ifb->off())); | |
1067 | ifb->set_saw_error(); | |
1068 | return Expression::make_error(loc); | |
1069 | } | |
1070 | ||
1071 | Temporary_statement* temp = | |
1072 | ifb->temporary_statement(static_cast<unsigned int>(idx)); | |
1073 | if (temp == NULL) | |
1074 | { | |
1075 | if (!ifb->saw_error()) | |
1076 | go_error_at(loc, | |
1077 | ("invalid export data for %qs: " | |
1078 | "undefined temporary reference index at %lu"), | |
1079 | ifb->name().c_str(), | |
1080 | static_cast<unsigned long>(ifb->off())); | |
1081 | ifb->set_saw_error(); | |
1082 | return Expression::make_error(loc); | |
1083 | } | |
1084 | ||
1085 | return Expression::make_temporary_reference(temp, loc); | |
1086 | } | |
1087 | ||
ea664253 | 1088 | // Get a backend expression referring to the variable. |
e440a328 | 1089 | |
ea664253 | 1090 | Bexpression* |
1091 | Temporary_reference_expression::do_get_backend(Translate_context* context) | |
e440a328 | 1092 | { |
cd440cff | 1093 | Gogo* gogo = context->gogo(); |
eefc1ed3 | 1094 | Bvariable* bvar = this->statement_->get_backend_variable(context); |
7af8e400 | 1095 | Bexpression* ret = gogo->backend()->var_expression(bvar, this->location()); |
eefc1ed3 | 1096 | |
cd440cff | 1097 | // The backend can't always represent the same set of recursive types |
eefc1ed3 | 1098 | // that the Go frontend can. In some cases this means that a |
1099 | // temporary variable won't have the right backend type. Correct | |
1100 | // that here by adding a type cast. We need to use base() to push | |
1101 | // the circularity down one level. | |
cd440cff | 1102 | Type* stype = this->statement_->type(); |
ceeb4318 | 1103 | if (!this->is_lvalue_ |
03118c21 | 1104 | && stype->points_to() != NULL |
1105 | && stype->points_to()->is_void_type()) | |
eefc1ed3 | 1106 | { |
cd440cff | 1107 | Btype* btype = this->type()->base()->get_backend(gogo); |
1108 | ret = gogo->backend()->convert_expression(btype, ret, this->location()); | |
eefc1ed3 | 1109 | } |
ea664253 | 1110 | return ret; |
e440a328 | 1111 | } |
1112 | ||
d751bb78 | 1113 | // Ast dump for temporary reference. |
1114 | ||
1115 | void | |
1116 | Temporary_reference_expression::do_dump_expression( | |
1117 | Ast_dump_context* ast_dump_context) const | |
1118 | { | |
1119 | ast_dump_context->dump_temp_variable_name(this->statement_); | |
1120 | } | |
1121 | ||
e440a328 | 1122 | // Make a reference to a temporary variable. |
1123 | ||
ceeb4318 | 1124 | Temporary_reference_expression* |
e440a328 | 1125 | Expression::make_temporary_reference(Temporary_statement* statement, |
b13c66cd | 1126 | Location location) |
e440a328 | 1127 | { |
38ba9eec | 1128 | statement->add_use(); |
e440a328 | 1129 | return new Temporary_reference_expression(statement, location); |
1130 | } | |
1131 | ||
e9d3367e | 1132 | // Class Set_and_use_temporary_expression. |
1133 | ||
1134 | // Return the type. | |
1135 | ||
1136 | Type* | |
1137 | Set_and_use_temporary_expression::do_type() | |
1138 | { | |
1139 | return this->statement_->type(); | |
1140 | } | |
1141 | ||
0afbb937 | 1142 | // Determine the type of the expression. |
1143 | ||
1144 | void | |
1145 | Set_and_use_temporary_expression::do_determine_type( | |
1146 | const Type_context* context) | |
1147 | { | |
1148 | this->expr_->determine_type(context); | |
1149 | } | |
1150 | ||
e9d3367e | 1151 | // Take the address. |
1152 | ||
1153 | void | |
1154 | Set_and_use_temporary_expression::do_address_taken(bool) | |
1155 | { | |
1156 | this->statement_->set_is_address_taken(); | |
1157 | } | |
1158 | ||
1159 | // Return the backend representation. | |
1160 | ||
ea664253 | 1161 | Bexpression* |
1162 | Set_and_use_temporary_expression::do_get_backend(Translate_context* context) | |
e9d3367e | 1163 | { |
e9d3367e | 1164 | Location loc = this->location(); |
a302c105 | 1165 | Gogo* gogo = context->gogo(); |
1166 | Bvariable* bvar = this->statement_->get_backend_variable(context); | |
7af8e400 | 1167 | Bexpression* lvar_ref = gogo->backend()->var_expression(bvar, loc); |
a302c105 | 1168 | |
0ab48656 | 1169 | Named_object* fn = context->function(); |
1170 | go_assert(fn != NULL); | |
1171 | Bfunction* bfn = fn->func_value()->get_or_make_decl(gogo, fn); | |
ea664253 | 1172 | Bexpression* bexpr = this->expr_->get_backend(context); |
0ab48656 | 1173 | Bstatement* set = gogo->backend()->assignment_statement(bfn, lvar_ref, |
1174 | bexpr, loc); | |
7af8e400 | 1175 | Bexpression* var_ref = gogo->backend()->var_expression(bvar, loc); |
a302c105 | 1176 | Bexpression* ret = gogo->backend()->compound_expression(set, var_ref, loc); |
ea664253 | 1177 | return ret; |
e9d3367e | 1178 | } |
1179 | ||
1180 | // Dump. | |
1181 | ||
1182 | void | |
1183 | Set_and_use_temporary_expression::do_dump_expression( | |
1184 | Ast_dump_context* ast_dump_context) const | |
1185 | { | |
1186 | ast_dump_context->ostream() << '('; | |
1187 | ast_dump_context->dump_temp_variable_name(this->statement_); | |
1188 | ast_dump_context->ostream() << " = "; | |
1189 | this->expr_->dump_expression(ast_dump_context); | |
1190 | ast_dump_context->ostream() << ')'; | |
1191 | } | |
1192 | ||
1193 | // Make a set-and-use temporary. | |
1194 | ||
1195 | Set_and_use_temporary_expression* | |
1196 | Expression::make_set_and_use_temporary(Temporary_statement* statement, | |
1197 | Expression* expr, Location location) | |
1198 | { | |
1199 | return new Set_and_use_temporary_expression(statement, expr, location); | |
1200 | } | |
1201 | ||
e440a328 | 1202 | // A sink expression--a use of the blank identifier _. |
1203 | ||
1204 | class Sink_expression : public Expression | |
1205 | { | |
1206 | public: | |
b13c66cd | 1207 | Sink_expression(Location location) |
e440a328 | 1208 | : Expression(EXPRESSION_SINK, location), |
aa93217a | 1209 | type_(NULL), bvar_(NULL) |
e440a328 | 1210 | { } |
1211 | ||
1212 | protected: | |
4f2138d7 | 1213 | bool |
e440a328 | 1214 | do_discarding_value() |
4f2138d7 | 1215 | { return true; } |
e440a328 | 1216 | |
1217 | Type* | |
1218 | do_type(); | |
1219 | ||
1220 | void | |
1221 | do_determine_type(const Type_context*); | |
1222 | ||
1223 | Expression* | |
1224 | do_copy() | |
1225 | { return new Sink_expression(this->location()); } | |
1226 | ||
ea664253 | 1227 | Bexpression* |
1228 | do_get_backend(Translate_context*); | |
e440a328 | 1229 | |
d751bb78 | 1230 | void |
1231 | do_dump_expression(Ast_dump_context*) const; | |
1232 | ||
e440a328 | 1233 | private: |
1234 | // The type of this sink variable. | |
1235 | Type* type_; | |
1236 | // The temporary variable we generate. | |
aa93217a | 1237 | Bvariable* bvar_; |
e440a328 | 1238 | }; |
1239 | ||
1240 | // Return the type of a sink expression. | |
1241 | ||
1242 | Type* | |
1243 | Sink_expression::do_type() | |
1244 | { | |
1245 | if (this->type_ == NULL) | |
1246 | return Type::make_sink_type(); | |
1247 | return this->type_; | |
1248 | } | |
1249 | ||
1250 | // Determine the type of a sink expression. | |
1251 | ||
1252 | void | |
1253 | Sink_expression::do_determine_type(const Type_context* context) | |
1254 | { | |
1255 | if (context->type != NULL) | |
1256 | this->type_ = context->type; | |
1257 | } | |
1258 | ||
1259 | // Return a temporary variable for a sink expression. This will | |
1260 | // presumably be a write-only variable which the middle-end will drop. | |
1261 | ||
ea664253 | 1262 | Bexpression* |
1263 | Sink_expression::do_get_backend(Translate_context* context) | |
e440a328 | 1264 | { |
aa93217a | 1265 | Location loc = this->location(); |
1266 | Gogo* gogo = context->gogo(); | |
1267 | if (this->bvar_ == NULL) | |
e440a328 | 1268 | { |
c484d925 | 1269 | go_assert(this->type_ != NULL && !this->type_->is_sink_type()); |
aa93217a | 1270 | Named_object* fn = context->function(); |
1271 | go_assert(fn != NULL); | |
1272 | Bfunction* fn_ctx = fn->func_value()->get_or_make_decl(gogo, fn); | |
9f0e0513 | 1273 | Btype* bt = this->type_->get_backend(context->gogo()); |
aa93217a | 1274 | Bstatement* decl; |
1275 | this->bvar_ = | |
1276 | gogo->backend()->temporary_variable(fn_ctx, context->bblock(), bt, NULL, | |
1277 | false, loc, &decl); | |
d4e6573e | 1278 | Bexpression* var_ref = |
7af8e400 | 1279 | gogo->backend()->var_expression(this->bvar_, loc); |
aa93217a | 1280 | var_ref = gogo->backend()->compound_expression(decl, var_ref, loc); |
ea664253 | 1281 | return var_ref; |
e440a328 | 1282 | } |
7af8e400 | 1283 | return gogo->backend()->var_expression(this->bvar_, loc); |
e440a328 | 1284 | } |
1285 | ||
d751bb78 | 1286 | // Ast dump for sink expression. |
1287 | ||
1288 | void | |
1289 | Sink_expression::do_dump_expression(Ast_dump_context* ast_dump_context) const | |
1290 | { | |
1291 | ast_dump_context->ostream() << "_" ; | |
1292 | } | |
1293 | ||
e440a328 | 1294 | // Make a sink expression. |
1295 | ||
1296 | Expression* | |
b13c66cd | 1297 | Expression::make_sink(Location location) |
e440a328 | 1298 | { |
1299 | return new Sink_expression(location); | |
1300 | } | |
1301 | ||
1302 | // Class Func_expression. | |
1303 | ||
1304 | // FIXME: Can a function expression appear in a constant expression? | |
1305 | // The value is unchanging. Initializing a constant to the address of | |
1306 | // a function seems like it could work, though there might be little | |
1307 | // point to it. | |
1308 | ||
e440a328 | 1309 | // Traversal. |
1310 | ||
1311 | int | |
1312 | Func_expression::do_traverse(Traverse* traverse) | |
1313 | { | |
1314 | return (this->closure_ == NULL | |
1315 | ? TRAVERSE_CONTINUE | |
1316 | : Expression::traverse(&this->closure_, traverse)); | |
1317 | } | |
1318 | ||
1319 | // Return the type of a function expression. | |
1320 | ||
1321 | Type* | |
1322 | Func_expression::do_type() | |
1323 | { | |
1324 | if (this->function_->is_function()) | |
1325 | return this->function_->func_value()->type(); | |
1326 | else if (this->function_->is_function_declaration()) | |
1327 | return this->function_->func_declaration_value()->type(); | |
1328 | else | |
c3e6f413 | 1329 | go_unreachable(); |
e440a328 | 1330 | } |
1331 | ||
ea664253 | 1332 | // Get the backend representation for the code of a function expression. |
e440a328 | 1333 | |
97267c39 | 1334 | Bexpression* |
8381eda7 | 1335 | Func_expression::get_code_pointer(Gogo* gogo, Named_object* no, Location loc) |
e440a328 | 1336 | { |
1337 | Function_type* fntype; | |
8381eda7 | 1338 | if (no->is_function()) |
1339 | fntype = no->func_value()->type(); | |
1340 | else if (no->is_function_declaration()) | |
1341 | fntype = no->func_declaration_value()->type(); | |
e440a328 | 1342 | else |
c3e6f413 | 1343 | go_unreachable(); |
e440a328 | 1344 | |
1345 | // Builtin functions are handled specially by Call_expression. We | |
1346 | // can't take their address. | |
1347 | if (fntype->is_builtin()) | |
1348 | { | |
631d5788 | 1349 | go_error_at(loc, |
37423a84 | 1350 | ("invalid use of special built-in function %qs; " |
1351 | "must be called"), | |
631d5788 | 1352 | no->message_name().c_str()); |
97267c39 | 1353 | return gogo->backend()->error_expression(); |
e440a328 | 1354 | } |
1355 | ||
97267c39 | 1356 | Bfunction* fndecl; |
e440a328 | 1357 | if (no->is_function()) |
cf3cae55 | 1358 | fndecl = no->func_value()->get_or_make_decl(gogo, no); |
e440a328 | 1359 | else if (no->is_function_declaration()) |
cf3cae55 | 1360 | fndecl = no->func_declaration_value()->get_or_make_decl(gogo, no); |
e440a328 | 1361 | else |
c3e6f413 | 1362 | go_unreachable(); |
e440a328 | 1363 | |
97267c39 | 1364 | return gogo->backend()->function_code_expression(fndecl, loc); |
e440a328 | 1365 | } |
1366 | ||
ea664253 | 1367 | // Get the backend representation for a function expression. This is used when |
1368 | // we take the address of a function rather than simply calling it. A func | |
8381eda7 | 1369 | // value is represented as a pointer to a block of memory. The first |
1370 | // word of that memory is a pointer to the function code. The | |
1371 | // remaining parts of that memory are the addresses of variables that | |
1372 | // the function closes over. | |
e440a328 | 1373 | |
ea664253 | 1374 | Bexpression* |
1375 | Func_expression::do_get_backend(Translate_context* context) | |
e440a328 | 1376 | { |
8381eda7 | 1377 | // If there is no closure, just use the function descriptor. |
2010c17a | 1378 | if (this->closure_ == NULL) |
8381eda7 | 1379 | { |
1380 | Gogo* gogo = context->gogo(); | |
1381 | Named_object* no = this->function_; | |
1382 | Expression* descriptor; | |
1383 | if (no->is_function()) | |
1384 | descriptor = no->func_value()->descriptor(gogo, no); | |
1385 | else if (no->is_function_declaration()) | |
1386 | { | |
1387 | if (no->func_declaration_value()->type()->is_builtin()) | |
1388 | { | |
631d5788 | 1389 | go_error_at(this->location(), |
37423a84 | 1390 | ("invalid use of special built-in function %qs; " |
631d5788 | 1391 | "must be called"), |
1392 | no->message_name().c_str()); | |
ea664253 | 1393 | return gogo->backend()->error_expression(); |
8381eda7 | 1394 | } |
1395 | descriptor = no->func_declaration_value()->descriptor(gogo, no); | |
1396 | } | |
1397 | else | |
1398 | go_unreachable(); | |
2010c17a | 1399 | |
ea664253 | 1400 | Bexpression* bdesc = descriptor->get_backend(context); |
1401 | return gogo->backend()->address_expression(bdesc, this->location()); | |
8381eda7 | 1402 | } |
e440a328 | 1403 | |
8381eda7 | 1404 | go_assert(this->function_->func_value()->enclosing() != NULL); |
e440a328 | 1405 | |
8381eda7 | 1406 | // If there is a closure, then the closure is itself the function |
1407 | // expression. It is a pointer to a struct whose first field points | |
1408 | // to the function code and whose remaining fields are the addresses | |
1409 | // of the closed-over variables. | |
76818e19 | 1410 | Bexpression *bexpr = this->closure_->get_backend(context); |
1411 | ||
1412 | // Introduce a backend type conversion, to account for any differences | |
1413 | // between the argument type (function descriptor, struct with a | |
1414 | // single field) and the closure (struct with multiple fields). | |
1415 | Gogo* gogo = context->gogo(); | |
1416 | Btype *btype = this->type()->get_backend(gogo); | |
1417 | return gogo->backend()->convert_expression(btype, bexpr, this->location()); | |
e440a328 | 1418 | } |
1419 | ||
e3d09834 | 1420 | // The cost of inlining a function reference. |
1421 | ||
1422 | int | |
1423 | Func_expression::do_inlining_cost() const | |
1424 | { | |
1425 | // FIXME: We don't inline references to nested functions. | |
1426 | if (this->closure_ != NULL) | |
1427 | return 0x100000; | |
1428 | if (this->function_->is_function() | |
1429 | && this->function_->func_value()->enclosing() != NULL) | |
1430 | return 0x100000; | |
1431 | ||
1432 | return 1; | |
1433 | } | |
1434 | ||
1435 | // Export a reference to a function. | |
1436 | ||
1437 | void | |
1438 | Func_expression::do_export(Export_function_body* efb) const | |
1439 | { | |
1440 | Expression::export_name(efb, this->function_); | |
1441 | } | |
1442 | ||
d751bb78 | 1443 | // Ast dump for function. |
1444 | ||
1445 | void | |
1446 | Func_expression::do_dump_expression(Ast_dump_context* ast_dump_context) const | |
1447 | { | |
8b1c301d | 1448 | ast_dump_context->ostream() << this->function_->name(); |
1449 | if (this->closure_ != NULL) | |
1450 | { | |
1451 | ast_dump_context->ostream() << " {closure = "; | |
1452 | this->closure_->dump_expression(ast_dump_context); | |
1453 | ast_dump_context->ostream() << "}"; | |
1454 | } | |
d751bb78 | 1455 | } |
1456 | ||
e440a328 | 1457 | // Make a reference to a function in an expression. |
1458 | ||
1459 | Expression* | |
1460 | Expression::make_func_reference(Named_object* function, Expression* closure, | |
b13c66cd | 1461 | Location location) |
e440a328 | 1462 | { |
b1d7ecfa | 1463 | Func_expression* fe = new Func_expression(function, closure, location); |
1464 | ||
1465 | // Detect references to builtin functions and set the runtime code if | |
1466 | // appropriate. | |
1467 | if (function->is_function_declaration()) | |
1468 | fe->set_runtime_code(Runtime::name_to_code(function->name())); | |
1469 | return fe; | |
e440a328 | 1470 | } |
1471 | ||
c6837989 | 1472 | // Class Func_descriptor_expression. |
8381eda7 | 1473 | |
c6837989 | 1474 | // Constructor. |
8381eda7 | 1475 | |
c6837989 | 1476 | Func_descriptor_expression::Func_descriptor_expression(Named_object* fn) |
1477 | : Expression(EXPRESSION_FUNC_DESCRIPTOR, fn->location()), | |
f8bdf81a | 1478 | fn_(fn), dvar_(NULL) |
c6837989 | 1479 | { |
1480 | go_assert(!fn->is_function() || !fn->func_value()->needs_closure()); | |
1481 | } | |
8381eda7 | 1482 | |
c6837989 | 1483 | // Traversal. |
8381eda7 | 1484 | |
c6837989 | 1485 | int |
1486 | Func_descriptor_expression::do_traverse(Traverse*) | |
1487 | { | |
1488 | return TRAVERSE_CONTINUE; | |
1489 | } | |
8381eda7 | 1490 | |
1491 | // All function descriptors have the same type. | |
1492 | ||
1493 | Type* Func_descriptor_expression::descriptor_type; | |
1494 | ||
1495 | void | |
1496 | Func_descriptor_expression::make_func_descriptor_type() | |
1497 | { | |
1498 | if (Func_descriptor_expression::descriptor_type != NULL) | |
1499 | return; | |
1500 | Type* uintptr_type = Type::lookup_integer_type("uintptr"); | |
81487fff | 1501 | Type* struct_type = Type::make_builtin_struct_type(1, "fn", uintptr_type); |
8381eda7 | 1502 | Func_descriptor_expression::descriptor_type = |
1503 | Type::make_builtin_named_type("functionDescriptor", struct_type); | |
1504 | } | |
1505 | ||
1506 | Type* | |
1507 | Func_descriptor_expression::do_type() | |
1508 | { | |
1509 | Func_descriptor_expression::make_func_descriptor_type(); | |
1510 | return Func_descriptor_expression::descriptor_type; | |
1511 | } | |
1512 | ||
ea664253 | 1513 | // The backend representation for a function descriptor. |
8381eda7 | 1514 | |
ea664253 | 1515 | Bexpression* |
1516 | Func_descriptor_expression::do_get_backend(Translate_context* context) | |
8381eda7 | 1517 | { |
8381eda7 | 1518 | Named_object* no = this->fn_; |
1519 | Location loc = no->location(); | |
ea664253 | 1520 | if (this->dvar_ != NULL) |
7af8e400 | 1521 | return context->backend()->var_expression(this->dvar_, loc); |
8381eda7 | 1522 | |
ea664253 | 1523 | Gogo* gogo = context->gogo(); |
19272321 | 1524 | std::string var_name(gogo->function_descriptor_name(no)); |
09e57698 | 1525 | bool is_descriptor = false; |
1526 | if (no->is_function_declaration() | |
1527 | && !no->func_declaration_value()->asm_name().empty() | |
1528 | && Linemap::is_predeclared_location(no->location())) | |
19272321 | 1529 | is_descriptor = true; |
8381eda7 | 1530 | |
13f2fdb8 | 1531 | // The runtime package implements some functions defined in the |
1532 | // syscall package. Let the syscall package define the descriptor | |
1533 | // in this case. | |
1534 | if (gogo->compiling_runtime() | |
1535 | && gogo->package_name() == "runtime" | |
1536 | && no->is_function() | |
1537 | && !no->func_value()->asm_name().empty() | |
1538 | && no->func_value()->asm_name().compare(0, 8, "syscall.") == 0) | |
1539 | is_descriptor = true; | |
1540 | ||
8381eda7 | 1541 | Btype* btype = this->type()->get_backend(gogo); |
1542 | ||
1543 | Bvariable* bvar; | |
438b4bec | 1544 | std::string asm_name(go_selectively_encode_id(var_name)); |
09e57698 | 1545 | if (no->package() != NULL || is_descriptor) |
438b4bec | 1546 | bvar = context->backend()->immutable_struct_reference(var_name, asm_name, |
1547 | btype, loc); | |
8381eda7 | 1548 | else |
1549 | { | |
1550 | Location bloc = Linemap::predeclared_location(); | |
80efb81d | 1551 | |
1552 | // The runtime package has hash/equality functions that are | |
1553 | // referenced by type descriptors outside of the runtime, so the | |
1554 | // function descriptors must be visible even though they are not | |
1555 | // exported. | |
1556 | bool is_exported_runtime = false; | |
1557 | if (gogo->compiling_runtime() | |
1558 | && gogo->package_name() == "runtime" | |
1559 | && (no->name().find("hash") != std::string::npos | |
1560 | || no->name().find("equal") != std::string::npos)) | |
1561 | is_exported_runtime = true; | |
1562 | ||
8381eda7 | 1563 | bool is_hidden = ((no->is_function() |
1564 | && no->func_value()->enclosing() != NULL) | |
80efb81d | 1565 | || (Gogo::is_hidden_name(no->name()) |
1566 | && !is_exported_runtime) | |
8381eda7 | 1567 | || Gogo::is_thunk(no)); |
80efb81d | 1568 | |
438b4bec | 1569 | bvar = context->backend()->immutable_struct(var_name, asm_name, |
1570 | is_hidden, false, | |
8381eda7 | 1571 | btype, bloc); |
1572 | Expression_list* vals = new Expression_list(); | |
f8bdf81a | 1573 | vals->push_back(Expression::make_func_code_reference(this->fn_, bloc)); |
8381eda7 | 1574 | Expression* init = |
1575 | Expression::make_struct_composite_literal(this->type(), vals, bloc); | |
1576 | Translate_context bcontext(gogo, NULL, NULL, NULL); | |
1577 | bcontext.set_is_const(); | |
ea664253 | 1578 | Bexpression* binit = init->get_backend(&bcontext); |
8381eda7 | 1579 | context->backend()->immutable_struct_set_init(bvar, var_name, is_hidden, |
1580 | false, btype, bloc, binit); | |
1581 | } | |
1582 | ||
1583 | this->dvar_ = bvar; | |
7af8e400 | 1584 | return gogo->backend()->var_expression(bvar, loc); |
8381eda7 | 1585 | } |
1586 | ||
c6837989 | 1587 | // Print a function descriptor expression. |
1588 | ||
1589 | void | |
1590 | Func_descriptor_expression::do_dump_expression(Ast_dump_context* context) const | |
1591 | { | |
1592 | context->ostream() << "[descriptor " << this->fn_->name() << "]"; | |
1593 | } | |
1594 | ||
8381eda7 | 1595 | // Make a function descriptor expression. |
1596 | ||
c6837989 | 1597 | Func_descriptor_expression* |
1598 | Expression::make_func_descriptor(Named_object* fn) | |
8381eda7 | 1599 | { |
c6837989 | 1600 | return new Func_descriptor_expression(fn); |
8381eda7 | 1601 | } |
1602 | ||
1603 | // Make the function descriptor type, so that it can be converted. | |
1604 | ||
1605 | void | |
1606 | Expression::make_func_descriptor_type() | |
1607 | { | |
1608 | Func_descriptor_expression::make_func_descriptor_type(); | |
1609 | } | |
1610 | ||
1611 | // A reference to just the code of a function. | |
1612 | ||
1613 | class Func_code_reference_expression : public Expression | |
1614 | { | |
1615 | public: | |
1616 | Func_code_reference_expression(Named_object* function, Location location) | |
1617 | : Expression(EXPRESSION_FUNC_CODE_REFERENCE, location), | |
1618 | function_(function) | |
1619 | { } | |
1620 | ||
1621 | protected: | |
1622 | int | |
1623 | do_traverse(Traverse*) | |
1624 | { return TRAVERSE_CONTINUE; } | |
1625 | ||
f9ca30f9 | 1626 | bool |
3ae06f68 | 1627 | do_is_static_initializer() const |
f9ca30f9 | 1628 | { return true; } |
1629 | ||
8381eda7 | 1630 | Type* |
1631 | do_type() | |
1632 | { return Type::make_pointer_type(Type::make_void_type()); } | |
1633 | ||
1634 | void | |
1635 | do_determine_type(const Type_context*) | |
1636 | { } | |
1637 | ||
1638 | Expression* | |
1639 | do_copy() | |
1640 | { | |
1641 | return Expression::make_func_code_reference(this->function_, | |
1642 | this->location()); | |
1643 | } | |
1644 | ||
ea664253 | 1645 | Bexpression* |
1646 | do_get_backend(Translate_context*); | |
8381eda7 | 1647 | |
1648 | void | |
1649 | do_dump_expression(Ast_dump_context* context) const | |
1650 | { context->ostream() << "[raw " << this->function_->name() << "]" ; } | |
1651 | ||
1652 | private: | |
1653 | // The function. | |
1654 | Named_object* function_; | |
1655 | }; | |
1656 | ||
ea664253 | 1657 | // Get the backend representation for a reference to function code. |
8381eda7 | 1658 | |
ea664253 | 1659 | Bexpression* |
1660 | Func_code_reference_expression::do_get_backend(Translate_context* context) | |
8381eda7 | 1661 | { |
ea664253 | 1662 | return Func_expression::get_code_pointer(context->gogo(), this->function_, |
1663 | this->location()); | |
8381eda7 | 1664 | } |
1665 | ||
1666 | // Make a reference to the code of a function. | |
1667 | ||
1668 | Expression* | |
1669 | Expression::make_func_code_reference(Named_object* function, Location location) | |
1670 | { | |
1671 | return new Func_code_reference_expression(function, location); | |
1672 | } | |
1673 | ||
e440a328 | 1674 | // Class Unknown_expression. |
1675 | ||
1676 | // Return the name of an unknown expression. | |
1677 | ||
1678 | const std::string& | |
1679 | Unknown_expression::name() const | |
1680 | { | |
1681 | return this->named_object_->name(); | |
1682 | } | |
1683 | ||
1684 | // Lower a reference to an unknown name. | |
1685 | ||
1686 | Expression* | |
ceeb4318 | 1687 | Unknown_expression::do_lower(Gogo*, Named_object*, Statement_inserter*, int) |
e440a328 | 1688 | { |
b13c66cd | 1689 | Location location = this->location(); |
e440a328 | 1690 | Named_object* no = this->named_object_; |
deded542 | 1691 | Named_object* real; |
1692 | if (!no->is_unknown()) | |
1693 | real = no; | |
1694 | else | |
e440a328 | 1695 | { |
deded542 | 1696 | real = no->unknown_value()->real_named_object(); |
1697 | if (real == NULL) | |
1698 | { | |
1699 | if (this->is_composite_literal_key_) | |
1700 | return this; | |
acf8e158 | 1701 | if (!this->no_error_message_) |
631d5788 | 1702 | go_error_at(location, "reference to undefined name %qs", |
1703 | this->named_object_->message_name().c_str()); | |
deded542 | 1704 | return Expression::make_error(location); |
1705 | } | |
e440a328 | 1706 | } |
1707 | switch (real->classification()) | |
1708 | { | |
1709 | case Named_object::NAMED_OBJECT_CONST: | |
1710 | return Expression::make_const_reference(real, location); | |
1711 | case Named_object::NAMED_OBJECT_TYPE: | |
1712 | return Expression::make_type(real->type_value(), location); | |
1713 | case Named_object::NAMED_OBJECT_TYPE_DECLARATION: | |
1714 | if (this->is_composite_literal_key_) | |
1715 | return this; | |
acf8e158 | 1716 | if (!this->no_error_message_) |
631d5788 | 1717 | go_error_at(location, "reference to undefined type %qs", |
1718 | real->message_name().c_str()); | |
e440a328 | 1719 | return Expression::make_error(location); |
1720 | case Named_object::NAMED_OBJECT_VAR: | |
7d834090 | 1721 | real->var_value()->set_is_used(); |
e440a328 | 1722 | return Expression::make_var_reference(real, location); |
1723 | case Named_object::NAMED_OBJECT_FUNC: | |
1724 | case Named_object::NAMED_OBJECT_FUNC_DECLARATION: | |
1725 | return Expression::make_func_reference(real, NULL, location); | |
1726 | case Named_object::NAMED_OBJECT_PACKAGE: | |
1727 | if (this->is_composite_literal_key_) | |
1728 | return this; | |
acf8e158 | 1729 | if (!this->no_error_message_) |
631d5788 | 1730 | go_error_at(location, "unexpected reference to package"); |
e440a328 | 1731 | return Expression::make_error(location); |
1732 | default: | |
c3e6f413 | 1733 | go_unreachable(); |
e440a328 | 1734 | } |
1735 | } | |
1736 | ||
d751bb78 | 1737 | // Dump the ast representation for an unknown expression to a dump context. |
1738 | ||
1739 | void | |
1740 | Unknown_expression::do_dump_expression(Ast_dump_context* ast_dump_context) const | |
1741 | { | |
1742 | ast_dump_context->ostream() << "_Unknown_(" << this->named_object_->name() | |
1743 | << ")"; | |
d751bb78 | 1744 | } |
1745 | ||
e440a328 | 1746 | // Make a reference to an unknown name. |
1747 | ||
acf8e158 | 1748 | Unknown_expression* |
b13c66cd | 1749 | Expression::make_unknown_reference(Named_object* no, Location location) |
e440a328 | 1750 | { |
e440a328 | 1751 | return new Unknown_expression(no, location); |
1752 | } | |
1753 | ||
1754 | // A boolean expression. | |
1755 | ||
1756 | class Boolean_expression : public Expression | |
1757 | { | |
1758 | public: | |
b13c66cd | 1759 | Boolean_expression(bool val, Location location) |
e440a328 | 1760 | : Expression(EXPRESSION_BOOLEAN, location), |
1761 | val_(val), type_(NULL) | |
1762 | { } | |
1763 | ||
1764 | static Expression* | |
bc8e2ef4 | 1765 | do_import(Import_expression*, Location); |
e440a328 | 1766 | |
1767 | protected: | |
1768 | bool | |
1769 | do_is_constant() const | |
1770 | { return true; } | |
1771 | ||
d2199dbc | 1772 | bool |
1773 | do_is_zero_value() const | |
1774 | { return this->val_ == false; } | |
1775 | ||
ac7ef97d | 1776 | bool |
1777 | do_boolean_constant_value(bool* val) const | |
1778 | { | |
1779 | *val = this->val_; | |
1780 | return true; | |
1781 | } | |
1782 | ||
0e168074 | 1783 | bool |
3ae06f68 | 1784 | do_is_static_initializer() const |
0e168074 | 1785 | { return true; } |
1786 | ||
e440a328 | 1787 | Type* |
1788 | do_type(); | |
1789 | ||
1790 | void | |
1791 | do_determine_type(const Type_context*); | |
1792 | ||
1793 | Expression* | |
1794 | do_copy() | |
1795 | { return this; } | |
1796 | ||
ea664253 | 1797 | Bexpression* |
1798 | do_get_backend(Translate_context* context) | |
1799 | { return context->backend()->boolean_constant_expression(this->val_); } | |
e440a328 | 1800 | |
5f6f5357 | 1801 | int |
1802 | do_inlining_cost() const | |
1803 | { return 1; } | |
1804 | ||
e440a328 | 1805 | void |
548be246 | 1806 | do_export(Export_function_body* efb) const |
204d4af4 | 1807 | { efb->write_c_string(this->val_ ? "$true" : "$false"); } |
e440a328 | 1808 | |
d751bb78 | 1809 | void |
1810 | do_dump_expression(Ast_dump_context* ast_dump_context) const | |
1811 | { ast_dump_context->ostream() << (this->val_ ? "true" : "false"); } | |
66b1ea95 | 1812 | |
e440a328 | 1813 | private: |
1814 | // The constant. | |
1815 | bool val_; | |
1816 | // The type as determined by context. | |
1817 | Type* type_; | |
1818 | }; | |
1819 | ||
1820 | // Get the type. | |
1821 | ||
1822 | Type* | |
1823 | Boolean_expression::do_type() | |
1824 | { | |
1825 | if (this->type_ == NULL) | |
1826 | this->type_ = Type::make_boolean_type(); | |
1827 | return this->type_; | |
1828 | } | |
1829 | ||
1830 | // Set the type from the context. | |
1831 | ||
1832 | void | |
1833 | Boolean_expression::do_determine_type(const Type_context* context) | |
1834 | { | |
1835 | if (this->type_ != NULL && !this->type_->is_abstract()) | |
1836 | ; | |
1837 | else if (context->type != NULL && context->type->is_boolean_type()) | |
1838 | this->type_ = context->type; | |
1839 | else if (!context->may_be_abstract) | |
1840 | this->type_ = Type::lookup_bool_type(); | |
1841 | } | |
1842 | ||
1843 | // Import a boolean constant. | |
1844 | ||
1845 | Expression* | |
bc8e2ef4 | 1846 | Boolean_expression::do_import(Import_expression* imp, Location loc) |
e440a328 | 1847 | { |
204d4af4 | 1848 | if (imp->version() >= EXPORT_FORMAT_V3) |
1849 | imp->require_c_string("$"); | |
e440a328 | 1850 | if (imp->peek_char() == 't') |
1851 | { | |
1852 | imp->require_c_string("true"); | |
9b92780c | 1853 | return Expression::make_boolean(true, loc); |
e440a328 | 1854 | } |
1855 | else | |
1856 | { | |
1857 | imp->require_c_string("false"); | |
9b92780c | 1858 | return Expression::make_boolean(false, loc); |
e440a328 | 1859 | } |
1860 | } | |
1861 | ||
1862 | // Make a boolean expression. | |
1863 | ||
1864 | Expression* | |
b13c66cd | 1865 | Expression::make_boolean(bool val, Location location) |
e440a328 | 1866 | { |
1867 | return new Boolean_expression(val, location); | |
1868 | } | |
1869 | ||
1870 | // Class String_expression. | |
1871 | ||
1872 | // Get the type. | |
1873 | ||
1874 | Type* | |
1875 | String_expression::do_type() | |
1876 | { | |
1877 | if (this->type_ == NULL) | |
1878 | this->type_ = Type::make_string_type(); | |
1879 | return this->type_; | |
1880 | } | |
1881 | ||
1882 | // Set the type from the context. | |
1883 | ||
1884 | void | |
1885 | String_expression::do_determine_type(const Type_context* context) | |
1886 | { | |
1887 | if (this->type_ != NULL && !this->type_->is_abstract()) | |
1888 | ; | |
1889 | else if (context->type != NULL && context->type->is_string_type()) | |
1890 | this->type_ = context->type; | |
1891 | else if (!context->may_be_abstract) | |
1892 | this->type_ = Type::lookup_string_type(); | |
1893 | } | |
1894 | ||
1895 | // Build a string constant. | |
1896 | ||
ea664253 | 1897 | Bexpression* |
1898 | String_expression::do_get_backend(Translate_context* context) | |
e440a328 | 1899 | { |
2c809f8f | 1900 | Gogo* gogo = context->gogo(); |
1901 | Btype* btype = Type::make_string_type()->get_backend(gogo); | |
1902 | ||
1903 | Location loc = this->location(); | |
1904 | std::vector<Bexpression*> init(2); | |
1905 | Bexpression* str_cst = | |
1906 | gogo->backend()->string_constant_expression(this->val_); | |
1907 | init[0] = gogo->backend()->address_expression(str_cst, loc); | |
1908 | ||
1909 | Btype* int_btype = Type::lookup_integer_type("int")->get_backend(gogo); | |
1910 | mpz_t lenval; | |
1911 | mpz_init_set_ui(lenval, this->val_.length()); | |
1912 | init[1] = gogo->backend()->integer_constant_expression(int_btype, lenval); | |
1913 | mpz_clear(lenval); | |
1914 | ||
ea664253 | 1915 | return gogo->backend()->constructor_expression(btype, init, loc); |
e440a328 | 1916 | } |
1917 | ||
8b1c301d | 1918 | // Write string literal to string dump. |
e440a328 | 1919 | |
1920 | void | |
8b1c301d | 1921 | String_expression::export_string(String_dump* exp, |
1922 | const String_expression* str) | |
e440a328 | 1923 | { |
1924 | std::string s; | |
8b1c301d | 1925 | s.reserve(str->val_.length() * 4 + 2); |
e440a328 | 1926 | s += '"'; |
8b1c301d | 1927 | for (std::string::const_iterator p = str->val_.begin(); |
1928 | p != str->val_.end(); | |
e440a328 | 1929 | ++p) |
1930 | { | |
1931 | if (*p == '\\' || *p == '"') | |
1932 | { | |
1933 | s += '\\'; | |
1934 | s += *p; | |
1935 | } | |
1936 | else if (*p >= 0x20 && *p < 0x7f) | |
1937 | s += *p; | |
1938 | else if (*p == '\n') | |
1939 | s += "\\n"; | |
1940 | else if (*p == '\t') | |
1941 | s += "\\t"; | |
1942 | else | |
1943 | { | |
1944 | s += "\\x"; | |
1945 | unsigned char c = *p; | |
1946 | unsigned int dig = c >> 4; | |
1947 | s += dig < 10 ? '0' + dig : 'A' + dig - 10; | |
1948 | dig = c & 0xf; | |
1949 | s += dig < 10 ? '0' + dig : 'A' + dig - 10; | |
1950 | } | |
1951 | } | |
1952 | s += '"'; | |
1953 | exp->write_string(s); | |
1954 | } | |
1955 | ||
8b1c301d | 1956 | // Export a string expression. |
1957 | ||
1958 | void | |
548be246 | 1959 | String_expression::do_export(Export_function_body* efb) const |
8b1c301d | 1960 | { |
548be246 | 1961 | String_expression::export_string(efb, this); |
8b1c301d | 1962 | } |
1963 | ||
e440a328 | 1964 | // Import a string expression. |
1965 | ||
1966 | Expression* | |
bc8e2ef4 | 1967 | String_expression::do_import(Import_expression* imp, Location loc) |
e440a328 | 1968 | { |
1969 | imp->require_c_string("\""); | |
1970 | std::string val; | |
1971 | while (true) | |
1972 | { | |
1973 | int c = imp->get_char(); | |
1974 | if (c == '"' || c == -1) | |
1975 | break; | |
1976 | if (c != '\\') | |
1977 | val += static_cast<char>(c); | |
1978 | else | |
1979 | { | |
1980 | c = imp->get_char(); | |
1981 | if (c == '\\' || c == '"') | |
1982 | val += static_cast<char>(c); | |
1983 | else if (c == 'n') | |
1984 | val += '\n'; | |
1985 | else if (c == 't') | |
1986 | val += '\t'; | |
1987 | else if (c == 'x') | |
1988 | { | |
1989 | c = imp->get_char(); | |
1990 | unsigned int vh = c >= '0' && c <= '9' ? c - '0' : c - 'A' + 10; | |
1991 | c = imp->get_char(); | |
1992 | unsigned int vl = c >= '0' && c <= '9' ? c - '0' : c - 'A' + 10; | |
1993 | char v = (vh << 4) | vl; | |
1994 | val += v; | |
1995 | } | |
1996 | else | |
1997 | { | |
631d5788 | 1998 | go_error_at(imp->location(), "bad string constant"); |
9b92780c | 1999 | return Expression::make_error(loc); |
e440a328 | 2000 | } |
2001 | } | |
2002 | } | |
9b92780c | 2003 | return Expression::make_string(val, loc); |
e440a328 | 2004 | } |
2005 | ||
d751bb78 | 2006 | // Ast dump for string expression. |
2007 | ||
2008 | void | |
2009 | String_expression::do_dump_expression(Ast_dump_context* ast_dump_context) const | |
2010 | { | |
8b1c301d | 2011 | String_expression::export_string(ast_dump_context, this); |
d751bb78 | 2012 | } |
2013 | ||
4713b5b9 | 2014 | // Make a string expression with abstract string type (common case). |
e440a328 | 2015 | |
2016 | Expression* | |
b13c66cd | 2017 | Expression::make_string(const std::string& val, Location location) |
e440a328 | 2018 | { |
4713b5b9 | 2019 | return new String_expression(val, NULL, location); |
2020 | } | |
2021 | ||
2022 | // Make a string expression with a specific string type. | |
2023 | ||
2024 | Expression* | |
2025 | Expression::make_string_typed(const std::string& val, Type* type, Location location) | |
2026 | { | |
2027 | return new String_expression(val, type, location); | |
e440a328 | 2028 | } |
2029 | ||
2c809f8f | 2030 | // An expression that evaluates to some characteristic of a string. |
2031 | // This is used when indexing, bound-checking, or nil checking a string. | |
2032 | ||
2033 | class String_info_expression : public Expression | |
2034 | { | |
2035 | public: | |
2036 | String_info_expression(Expression* string, String_info string_info, | |
2037 | Location location) | |
2038 | : Expression(EXPRESSION_STRING_INFO, location), | |
2039 | string_(string), string_info_(string_info) | |
2040 | { } | |
2041 | ||
2042 | protected: | |
2043 | Type* | |
2044 | do_type(); | |
2045 | ||
2046 | void | |
2047 | do_determine_type(const Type_context*) | |
2048 | { go_unreachable(); } | |
2049 | ||
2050 | Expression* | |
2051 | do_copy() | |
2052 | { | |
2053 | return new String_info_expression(this->string_->copy(), this->string_info_, | |
2054 | this->location()); | |
2055 | } | |
2056 | ||
ea664253 | 2057 | Bexpression* |
2058 | do_get_backend(Translate_context* context); | |
2c809f8f | 2059 | |
2060 | void | |
2061 | do_dump_expression(Ast_dump_context*) const; | |
2062 | ||
2063 | void | |
2064 | do_issue_nil_check() | |
2065 | { this->string_->issue_nil_check(); } | |
2066 | ||
2067 | private: | |
2068 | // The string for which we are getting information. | |
2069 | Expression* string_; | |
2070 | // What information we want. | |
2071 | String_info string_info_; | |
2072 | }; | |
2073 | ||
2074 | // Return the type of the string info. | |
2075 | ||
2076 | Type* | |
2077 | String_info_expression::do_type() | |
2078 | { | |
2079 | switch (this->string_info_) | |
2080 | { | |
2081 | case STRING_INFO_DATA: | |
2082 | { | |
2083 | Type* byte_type = Type::lookup_integer_type("uint8"); | |
2084 | return Type::make_pointer_type(byte_type); | |
2085 | } | |
2086 | case STRING_INFO_LENGTH: | |
2087 | return Type::lookup_integer_type("int"); | |
2088 | default: | |
2089 | go_unreachable(); | |
2090 | } | |
2091 | } | |
2092 | ||
2093 | // Return string information in GENERIC. | |
2094 | ||
ea664253 | 2095 | Bexpression* |
2096 | String_info_expression::do_get_backend(Translate_context* context) | |
2c809f8f | 2097 | { |
2098 | Gogo* gogo = context->gogo(); | |
2099 | ||
ea664253 | 2100 | Bexpression* bstring = this->string_->get_backend(context); |
2c809f8f | 2101 | switch (this->string_info_) |
2102 | { | |
2103 | case STRING_INFO_DATA: | |
2104 | case STRING_INFO_LENGTH: | |
ea664253 | 2105 | return gogo->backend()->struct_field_expression(bstring, |
2106 | this->string_info_, | |
2107 | this->location()); | |
2c809f8f | 2108 | break; |
2109 | default: | |
2110 | go_unreachable(); | |
2111 | } | |
2c809f8f | 2112 | } |
2113 | ||
2114 | // Dump ast representation for a type info expression. | |
2115 | ||
2116 | void | |
2117 | String_info_expression::do_dump_expression( | |
2118 | Ast_dump_context* ast_dump_context) const | |
2119 | { | |
2120 | ast_dump_context->ostream() << "stringinfo("; | |
2121 | this->string_->dump_expression(ast_dump_context); | |
2122 | ast_dump_context->ostream() << ","; | |
66b1ea95 | 2123 | ast_dump_context->ostream() << |
2124 | (this->string_info_ == STRING_INFO_DATA ? "data" | |
2c809f8f | 2125 | : this->string_info_ == STRING_INFO_LENGTH ? "length" |
2126 | : "unknown"); | |
2127 | ast_dump_context->ostream() << ")"; | |
2128 | } | |
2129 | ||
2130 | // Make a string info expression. | |
2131 | ||
2132 | Expression* | |
2133 | Expression::make_string_info(Expression* string, String_info string_info, | |
2134 | Location location) | |
2135 | { | |
2136 | return new String_info_expression(string, string_info, location); | |
2137 | } | |
2138 | ||
ae77af58 | 2139 | // An expression that represents an string value: a struct with value pointer |
2140 | // and length fields. | |
2141 | ||
2142 | class String_value_expression : public Expression | |
2143 | { | |
2144 | public: | |
2145 | String_value_expression(Expression* valptr, Expression* len, Location location) | |
2146 | : Expression(EXPRESSION_STRING_VALUE, location), | |
2147 | valptr_(valptr), len_(len) | |
2148 | { } | |
2149 | ||
2150 | protected: | |
2151 | int | |
2152 | do_traverse(Traverse*); | |
2153 | ||
2154 | Type* | |
2155 | do_type() | |
2156 | { return Type::make_string_type(); } | |
2157 | ||
2158 | void | |
2159 | do_determine_type(const Type_context*) | |
2160 | { go_unreachable(); } | |
2161 | ||
2162 | Expression* | |
2163 | do_copy() | |
2164 | { | |
2165 | return new String_value_expression(this->valptr_->copy(), | |
2166 | this->len_->copy(), | |
2167 | this->location()); | |
2168 | } | |
2169 | ||
2170 | Bexpression* | |
2171 | do_get_backend(Translate_context* context); | |
2172 | ||
2173 | void | |
2174 | do_dump_expression(Ast_dump_context*) const; | |
2175 | ||
2176 | private: | |
2177 | // The value pointer. | |
2178 | Expression* valptr_; | |
2179 | // The length. | |
2180 | Expression* len_; | |
2181 | }; | |
2182 | ||
2183 | int | |
2184 | String_value_expression::do_traverse(Traverse* traverse) | |
2185 | { | |
2186 | if (Expression::traverse(&this->valptr_, traverse) == TRAVERSE_EXIT | |
2187 | || Expression::traverse(&this->len_, traverse) == TRAVERSE_EXIT) | |
2188 | return TRAVERSE_EXIT; | |
2189 | return TRAVERSE_CONTINUE; | |
2190 | } | |
2191 | ||
2192 | Bexpression* | |
2193 | String_value_expression::do_get_backend(Translate_context* context) | |
2194 | { | |
2195 | std::vector<Bexpression*> vals(2); | |
2196 | vals[0] = this->valptr_->get_backend(context); | |
2197 | vals[1] = this->len_->get_backend(context); | |
2198 | ||
2199 | Gogo* gogo = context->gogo(); | |
2200 | Btype* btype = Type::make_string_type()->get_backend(gogo); | |
2201 | return gogo->backend()->constructor_expression(btype, vals, this->location()); | |
2202 | } | |
2203 | ||
2204 | void | |
2205 | String_value_expression::do_dump_expression( | |
2206 | Ast_dump_context* ast_dump_context) const | |
2207 | { | |
2208 | ast_dump_context->ostream() << "stringvalue("; | |
2209 | ast_dump_context->ostream() << "value: "; | |
2210 | this->valptr_->dump_expression(ast_dump_context); | |
2211 | ast_dump_context->ostream() << ", length: "; | |
2212 | this->len_->dump_expression(ast_dump_context); | |
2213 | ast_dump_context->ostream() << ")"; | |
2214 | } | |
2215 | ||
2216 | Expression* | |
2217 | Expression::make_string_value(Expression* valptr, Expression* len, | |
2218 | Location location) | |
2219 | { | |
2220 | return new String_value_expression(valptr, len, location); | |
2221 | } | |
2222 | ||
e440a328 | 2223 | // Make an integer expression. |
2224 | ||
2225 | class Integer_expression : public Expression | |
2226 | { | |
2227 | public: | |
5d4b8566 | 2228 | Integer_expression(const mpz_t* val, Type* type, bool is_character_constant, |
2229 | Location location) | |
e440a328 | 2230 | : Expression(EXPRESSION_INTEGER, location), |
5d4b8566 | 2231 | type_(type), is_character_constant_(is_character_constant) |
e440a328 | 2232 | { mpz_init_set(this->val_, *val); } |
2233 | ||
2234 | static Expression* | |
bc8e2ef4 | 2235 | do_import(Import_expression*, Location); |
e440a328 | 2236 | |
8b1c301d | 2237 | // Write VAL to string dump. |
e440a328 | 2238 | static void |
8b1c301d | 2239 | export_integer(String_dump* exp, const mpz_t val); |
e440a328 | 2240 | |
d751bb78 | 2241 | // Write VAL to dump context. |
2242 | static void | |
2243 | dump_integer(Ast_dump_context* ast_dump_context, const mpz_t val); | |
2244 | ||
e440a328 | 2245 | protected: |
2246 | bool | |
2247 | do_is_constant() const | |
2248 | { return true; } | |
2249 | ||
d2199dbc | 2250 | bool |
2251 | do_is_zero_value() const | |
2252 | { return mpz_sgn(this->val_) == 0; } | |
2253 | ||
0e168074 | 2254 | bool |
3ae06f68 | 2255 | do_is_static_initializer() const |
0e168074 | 2256 | { return true; } |
2257 | ||
e440a328 | 2258 | bool |
0c77715b | 2259 | do_numeric_constant_value(Numeric_constant* nc) const; |
e440a328 | 2260 | |
2261 | Type* | |
2262 | do_type(); | |
2263 | ||
2264 | void | |
2265 | do_determine_type(const Type_context* context); | |
2266 | ||
2267 | void | |
2268 | do_check_types(Gogo*); | |
2269 | ||
ea664253 | 2270 | Bexpression* |
2271 | do_get_backend(Translate_context*); | |
e440a328 | 2272 | |
2273 | Expression* | |
2274 | do_copy() | |
5d4b8566 | 2275 | { |
2276 | if (this->is_character_constant_) | |
de590a61 | 2277 | return Expression::make_character(&this->val_, |
2278 | (this->type_ == NULL | |
2279 | ? NULL | |
2280 | : this->type_->copy_expressions()), | |
5d4b8566 | 2281 | this->location()); |
2282 | else | |
de590a61 | 2283 | return Expression::make_integer_z(&this->val_, |
2284 | (this->type_ == NULL | |
2285 | ? NULL | |
2286 | : this->type_->copy_expressions()), | |
e67508fa | 2287 | this->location()); |
5d4b8566 | 2288 | } |
e440a328 | 2289 | |
5f6f5357 | 2290 | int |
2291 | do_inlining_cost() const | |
2292 | { return 1; } | |
2293 | ||
e440a328 | 2294 | void |
548be246 | 2295 | do_export(Export_function_body*) const; |
e440a328 | 2296 | |
d751bb78 | 2297 | void |
2298 | do_dump_expression(Ast_dump_context*) const; | |
2299 | ||
e440a328 | 2300 | private: |
2301 | // The integer value. | |
2302 | mpz_t val_; | |
2303 | // The type so far. | |
2304 | Type* type_; | |
5d4b8566 | 2305 | // Whether this is a character constant. |
2306 | bool is_character_constant_; | |
e440a328 | 2307 | }; |
2308 | ||
0c77715b | 2309 | // Return a numeric constant for this expression. We have to mark |
2310 | // this as a character when appropriate. | |
e440a328 | 2311 | |
2312 | bool | |
0c77715b | 2313 | Integer_expression::do_numeric_constant_value(Numeric_constant* nc) const |
e440a328 | 2314 | { |
0c77715b | 2315 | if (this->is_character_constant_) |
2316 | nc->set_rune(this->type_, this->val_); | |
2317 | else | |
2318 | nc->set_int(this->type_, this->val_); | |
e440a328 | 2319 | return true; |
2320 | } | |
2321 | ||
2322 | // Return the current type. If we haven't set the type yet, we return | |
2323 | // an abstract integer type. | |
2324 | ||
2325 | Type* | |
2326 | Integer_expression::do_type() | |
2327 | { | |
2328 | if (this->type_ == NULL) | |
5d4b8566 | 2329 | { |
2330 | if (this->is_character_constant_) | |
2331 | this->type_ = Type::make_abstract_character_type(); | |
2332 | else | |
2333 | this->type_ = Type::make_abstract_integer_type(); | |
2334 | } | |
e440a328 | 2335 | return this->type_; |
2336 | } | |
2337 | ||
2338 | // Set the type of the integer value. Here we may switch from an | |
2339 | // abstract type to a real type. | |
2340 | ||
2341 | void | |
2342 | Integer_expression::do_determine_type(const Type_context* context) | |
2343 | { | |
2344 | if (this->type_ != NULL && !this->type_->is_abstract()) | |
2345 | ; | |
0c77715b | 2346 | else if (context->type != NULL && context->type->is_numeric_type()) |
e440a328 | 2347 | this->type_ = context->type; |
2348 | else if (!context->may_be_abstract) | |
5d4b8566 | 2349 | { |
2350 | if (this->is_character_constant_) | |
2351 | this->type_ = Type::lookup_integer_type("int32"); | |
2352 | else | |
2353 | this->type_ = Type::lookup_integer_type("int"); | |
2354 | } | |
e440a328 | 2355 | } |
2356 | ||
e440a328 | 2357 | // Check the type of an integer constant. |
2358 | ||
2359 | void | |
2360 | Integer_expression::do_check_types(Gogo*) | |
2361 | { | |
0c77715b | 2362 | Type* type = this->type_; |
2363 | if (type == NULL) | |
e440a328 | 2364 | return; |
0c77715b | 2365 | Numeric_constant nc; |
2366 | if (this->is_character_constant_) | |
2367 | nc.set_rune(NULL, this->val_); | |
2368 | else | |
2369 | nc.set_int(NULL, this->val_); | |
2370 | if (!nc.set_type(type, true, this->location())) | |
e440a328 | 2371 | this->set_is_error(); |
2372 | } | |
2373 | ||
ea664253 | 2374 | // Get the backend representation for an integer constant. |
e440a328 | 2375 | |
ea664253 | 2376 | Bexpression* |
2377 | Integer_expression::do_get_backend(Translate_context* context) | |
e440a328 | 2378 | { |
12373dd5 | 2379 | if (this->is_error_expression() |
2380 | || (this->type_ != NULL && this->type_->is_error_type())) | |
2381 | { | |
2382 | go_assert(saw_errors()); | |
2383 | return context->gogo()->backend()->error_expression(); | |
2384 | } | |
2385 | ||
48c2a53a | 2386 | Type* resolved_type = NULL; |
e440a328 | 2387 | if (this->type_ != NULL && !this->type_->is_abstract()) |
48c2a53a | 2388 | resolved_type = this->type_; |
e440a328 | 2389 | else if (this->type_ != NULL && this->type_->float_type() != NULL) |
2390 | { | |
2391 | // We are converting to an abstract floating point type. | |
48c2a53a | 2392 | resolved_type = Type::lookup_float_type("float64"); |
e440a328 | 2393 | } |
2394 | else if (this->type_ != NULL && this->type_->complex_type() != NULL) | |
2395 | { | |
2396 | // We are converting to an abstract complex type. | |
48c2a53a | 2397 | resolved_type = Type::lookup_complex_type("complex128"); |
e440a328 | 2398 | } |
2399 | else | |
2400 | { | |
2401 | // If we still have an abstract type here, then this is being | |
2402 | // used in a constant expression which didn't get reduced for | |
2403 | // some reason. Use a type which will fit the value. We use <, | |
2404 | // not <=, because we need an extra bit for the sign bit. | |
2405 | int bits = mpz_sizeinbase(this->val_, 2); | |
1b1f2abf | 2406 | Type* int_type = Type::lookup_integer_type("int"); |
2407 | if (bits < int_type->integer_type()->bits()) | |
48c2a53a | 2408 | resolved_type = int_type; |
e440a328 | 2409 | else if (bits < 64) |
48c2a53a | 2410 | resolved_type = Type::lookup_integer_type("int64"); |
e440a328 | 2411 | else |
48c2a53a | 2412 | { |
2413 | if (!saw_errors()) | |
631d5788 | 2414 | go_error_at(this->location(), |
2415 | "unknown type for large integer constant"); | |
ea664253 | 2416 | return context->gogo()->backend()->error_expression(); |
48c2a53a | 2417 | } |
e440a328 | 2418 | } |
48c2a53a | 2419 | Numeric_constant nc; |
2420 | nc.set_int(resolved_type, this->val_); | |
ea664253 | 2421 | return Expression::backend_numeric_constant_expression(context, &nc); |
e440a328 | 2422 | } |
2423 | ||
2424 | // Write VAL to export data. | |
2425 | ||
2426 | void | |
8b1c301d | 2427 | Integer_expression::export_integer(String_dump* exp, const mpz_t val) |
e440a328 | 2428 | { |
2429 | char* s = mpz_get_str(NULL, 10, val); | |
2430 | exp->write_c_string(s); | |
2431 | free(s); | |
2432 | } | |
2433 | ||
2434 | // Export an integer in a constant expression. | |
2435 | ||
2436 | void | |
548be246 | 2437 | Integer_expression::do_export(Export_function_body* efb) const |
e440a328 | 2438 | { |
69f634cc | 2439 | bool added_type = false; |
2440 | if (this->type_ != NULL | |
2441 | && !this->type_->is_abstract() | |
2442 | && this->type_ != efb->type_context()) | |
2443 | { | |
2444 | efb->write_c_string("$convert("); | |
2445 | efb->write_type(this->type_); | |
2446 | efb->write_c_string(", "); | |
2447 | added_type = true; | |
2448 | } | |
2449 | ||
548be246 | 2450 | Integer_expression::export_integer(efb, this->val_); |
5d4b8566 | 2451 | if (this->is_character_constant_) |
548be246 | 2452 | efb->write_c_string("'"); |
e440a328 | 2453 | // A trailing space lets us reliably identify the end of the number. |
548be246 | 2454 | efb->write_c_string(" "); |
69f634cc | 2455 | |
2456 | if (added_type) | |
2457 | efb->write_c_string(")"); | |
e440a328 | 2458 | } |
2459 | ||
2460 | // Import an integer, floating point, or complex value. This handles | |
2461 | // all these types because they all start with digits. | |
2462 | ||
2463 | Expression* | |
bc8e2ef4 | 2464 | Integer_expression::do_import(Import_expression* imp, Location loc) |
e440a328 | 2465 | { |
2466 | std::string num = imp->read_identifier(); | |
2467 | imp->require_c_string(" "); | |
2468 | if (!num.empty() && num[num.length() - 1] == 'i') | |
2469 | { | |
2470 | mpfr_t real; | |
2471 | size_t plus_pos = num.find('+', 1); | |
2472 | size_t minus_pos = num.find('-', 1); | |
2473 | size_t pos; | |
2474 | if (plus_pos == std::string::npos) | |
2475 | pos = minus_pos; | |
2476 | else if (minus_pos == std::string::npos) | |
2477 | pos = plus_pos; | |
2478 | else | |
2479 | { | |
631d5788 | 2480 | go_error_at(imp->location(), "bad number in import data: %qs", |
2481 | num.c_str()); | |
9b92780c | 2482 | return Expression::make_error(loc); |
e440a328 | 2483 | } |
2484 | if (pos == std::string::npos) | |
2485 | mpfr_set_ui(real, 0, GMP_RNDN); | |
2486 | else | |
2487 | { | |
2488 | std::string real_str = num.substr(0, pos); | |
2489 | if (mpfr_init_set_str(real, real_str.c_str(), 10, GMP_RNDN) != 0) | |
2490 | { | |
631d5788 | 2491 | go_error_at(imp->location(), "bad number in import data: %qs", |
2492 | real_str.c_str()); | |
9b92780c | 2493 | return Expression::make_error(loc); |
e440a328 | 2494 | } |
2495 | } | |
2496 | ||
2497 | std::string imag_str; | |
2498 | if (pos == std::string::npos) | |
2499 | imag_str = num; | |
2500 | else | |
2501 | imag_str = num.substr(pos); | |
2502 | imag_str = imag_str.substr(0, imag_str.size() - 1); | |
2503 | mpfr_t imag; | |
2504 | if (mpfr_init_set_str(imag, imag_str.c_str(), 10, GMP_RNDN) != 0) | |
2505 | { | |
631d5788 | 2506 | go_error_at(imp->location(), "bad number in import data: %qs", |
2507 | imag_str.c_str()); | |
9b92780c | 2508 | return Expression::make_error(loc); |
e440a328 | 2509 | } |
fcbea5e4 | 2510 | mpc_t cval; |
2511 | mpc_init2(cval, mpc_precision); | |
2512 | mpc_set_fr_fr(cval, real, imag, MPC_RNDNN); | |
e440a328 | 2513 | mpfr_clear(real); |
2514 | mpfr_clear(imag); | |
9b92780c | 2515 | Expression* ret = Expression::make_complex(&cval, NULL, loc); |
fcbea5e4 | 2516 | mpc_clear(cval); |
e440a328 | 2517 | return ret; |
2518 | } | |
2519 | else if (num.find('.') == std::string::npos | |
2520 | && num.find('E') == std::string::npos) | |
2521 | { | |
5d4b8566 | 2522 | bool is_character_constant = (!num.empty() |
2523 | && num[num.length() - 1] == '\''); | |
2524 | if (is_character_constant) | |
2525 | num = num.substr(0, num.length() - 1); | |
e440a328 | 2526 | mpz_t val; |
2527 | if (mpz_init_set_str(val, num.c_str(), 10) != 0) | |
2528 | { | |
631d5788 | 2529 | go_error_at(imp->location(), "bad number in import data: %qs", |
2530 | num.c_str()); | |
9b92780c | 2531 | return Expression::make_error(loc); |
e440a328 | 2532 | } |
5d4b8566 | 2533 | Expression* ret; |
2534 | if (is_character_constant) | |
9b92780c | 2535 | ret = Expression::make_character(&val, NULL, loc); |
5d4b8566 | 2536 | else |
9b92780c | 2537 | ret = Expression::make_integer_z(&val, NULL, loc); |
e440a328 | 2538 | mpz_clear(val); |
2539 | return ret; | |
2540 | } | |
2541 | else | |
2542 | { | |
2543 | mpfr_t val; | |
2544 | if (mpfr_init_set_str(val, num.c_str(), 10, GMP_RNDN) != 0) | |
2545 | { | |
631d5788 | 2546 | go_error_at(imp->location(), "bad number in import data: %qs", |
2547 | num.c_str()); | |
9b92780c | 2548 | return Expression::make_error(loc); |
e440a328 | 2549 | } |
9b92780c | 2550 | Expression* ret = Expression::make_float(&val, NULL, loc); |
e440a328 | 2551 | mpfr_clear(val); |
2552 | return ret; | |
2553 | } | |
2554 | } | |
d751bb78 | 2555 | // Ast dump for integer expression. |
2556 | ||
2557 | void | |
2558 | Integer_expression::do_dump_expression(Ast_dump_context* ast_dump_context) const | |
2559 | { | |
5d4b8566 | 2560 | if (this->is_character_constant_) |
2561 | ast_dump_context->ostream() << '\''; | |
8b1c301d | 2562 | Integer_expression::export_integer(ast_dump_context, this->val_); |
5d4b8566 | 2563 | if (this->is_character_constant_) |
2564 | ast_dump_context->ostream() << '\''; | |
d751bb78 | 2565 | } |
2566 | ||
e67508fa | 2567 | // Build a new integer value from a multi-precision integer. |
e440a328 | 2568 | |
2569 | Expression* | |
e67508fa | 2570 | Expression::make_integer_z(const mpz_t* val, Type* type, Location location) |
5d4b8566 | 2571 | { |
2572 | return new Integer_expression(val, type, false, location); | |
2573 | } | |
2574 | ||
e67508fa | 2575 | // Build a new integer value from an unsigned long. |
2576 | ||
2577 | Expression* | |
2578 | Expression::make_integer_ul(unsigned long val, Type *type, Location location) | |
2579 | { | |
2580 | mpz_t zval; | |
2581 | mpz_init_set_ui(zval, val); | |
2582 | Expression* ret = Expression::make_integer_z(&zval, type, location); | |
2583 | mpz_clear(zval); | |
2584 | return ret; | |
2585 | } | |
2586 | ||
2587 | // Build a new integer value from a signed long. | |
2588 | ||
2589 | Expression* | |
2590 | Expression::make_integer_sl(long val, Type *type, Location location) | |
2591 | { | |
2592 | mpz_t zval; | |
2593 | mpz_init_set_si(zval, val); | |
2594 | Expression* ret = Expression::make_integer_z(&zval, type, location); | |
2595 | mpz_clear(zval); | |
2596 | return ret; | |
2597 | } | |
2598 | ||
3f378015 | 2599 | // Store an int64_t in an uninitialized mpz_t. |
2600 | ||
2601 | static void | |
2602 | set_mpz_from_int64(mpz_t* zval, int64_t val) | |
2603 | { | |
2604 | if (val >= 0) | |
2605 | { | |
2606 | unsigned long ul = static_cast<unsigned long>(val); | |
2607 | if (static_cast<int64_t>(ul) == val) | |
2608 | { | |
2609 | mpz_init_set_ui(*zval, ul); | |
2610 | return; | |
2611 | } | |
2612 | } | |
2613 | uint64_t uv; | |
2614 | if (val >= 0) | |
2615 | uv = static_cast<uint64_t>(val); | |
2616 | else | |
2617 | uv = static_cast<uint64_t>(- val); | |
2618 | unsigned long ul = uv & 0xffffffffUL; | |
2619 | mpz_init_set_ui(*zval, ul); | |
2620 | mpz_t hval; | |
2621 | mpz_init_set_ui(hval, static_cast<unsigned long>(uv >> 32)); | |
2622 | mpz_mul_2exp(hval, hval, 32); | |
2623 | mpz_add(*zval, *zval, hval); | |
2624 | mpz_clear(hval); | |
2625 | if (val < 0) | |
2626 | mpz_neg(*zval, *zval); | |
2627 | } | |
2628 | ||
2629 | // Build a new integer value from an int64_t. | |
2630 | ||
2631 | Expression* | |
2632 | Expression::make_integer_int64(int64_t val, Type* type, Location location) | |
2633 | { | |
2634 | mpz_t zval; | |
2635 | set_mpz_from_int64(&zval, val); | |
2636 | Expression* ret = Expression::make_integer_z(&zval, type, location); | |
2637 | mpz_clear(zval); | |
2638 | return ret; | |
2639 | } | |
2640 | ||
5d4b8566 | 2641 | // Build a new character constant value. |
2642 | ||
2643 | Expression* | |
2644 | Expression::make_character(const mpz_t* val, Type* type, Location location) | |
e440a328 | 2645 | { |
5d4b8566 | 2646 | return new Integer_expression(val, type, true, location); |
e440a328 | 2647 | } |
2648 | ||
2649 | // Floats. | |
2650 | ||
2651 | class Float_expression : public Expression | |
2652 | { | |
2653 | public: | |
b13c66cd | 2654 | Float_expression(const mpfr_t* val, Type* type, Location location) |
e440a328 | 2655 | : Expression(EXPRESSION_FLOAT, location), |
2656 | type_(type) | |
2657 | { | |
2658 | mpfr_init_set(this->val_, *val, GMP_RNDN); | |
2659 | } | |
2660 | ||
e440a328 | 2661 | // Write VAL to export data. |
2662 | static void | |
8b1c301d | 2663 | export_float(String_dump* exp, const mpfr_t val); |
2664 | ||
d751bb78 | 2665 | // Write VAL to dump file. |
2666 | static void | |
2667 | dump_float(Ast_dump_context* ast_dump_context, const mpfr_t val); | |
e440a328 | 2668 | |
2669 | protected: | |
2670 | bool | |
2671 | do_is_constant() const | |
2672 | { return true; } | |
2673 | ||
d2199dbc | 2674 | bool |
2675 | do_is_zero_value() const | |
2676 | { | |
2677 | return mpfr_zero_p(this->val_) != 0 | |
2678 | && mpfr_signbit(this->val_) == 0; | |
2679 | } | |
2680 | ||
0e168074 | 2681 | bool |
3ae06f68 | 2682 | do_is_static_initializer() const |
0e168074 | 2683 | { return true; } |
2684 | ||
e440a328 | 2685 | bool |
0c77715b | 2686 | do_numeric_constant_value(Numeric_constant* nc) const |
2687 | { | |
2688 | nc->set_float(this->type_, this->val_); | |
2689 | return true; | |
2690 | } | |
e440a328 | 2691 | |
2692 | Type* | |
2693 | do_type(); | |
2694 | ||
2695 | void | |
2696 | do_determine_type(const Type_context*); | |
2697 | ||
2698 | void | |
2699 | do_check_types(Gogo*); | |
2700 | ||
2701 | Expression* | |
2702 | do_copy() | |
de590a61 | 2703 | { return Expression::make_float(&this->val_, |
2704 | (this->type_ == NULL | |
2705 | ? NULL | |
2706 | : this->type_->copy_expressions()), | |
e440a328 | 2707 | this->location()); } |
2708 | ||
ea664253 | 2709 | Bexpression* |
2710 | do_get_backend(Translate_context*); | |
e440a328 | 2711 | |
5f6f5357 | 2712 | int |
2713 | do_inlining_cost() const | |
2714 | { return 1; } | |
2715 | ||
e440a328 | 2716 | void |
548be246 | 2717 | do_export(Export_function_body*) const; |
e440a328 | 2718 | |
d751bb78 | 2719 | void |
2720 | do_dump_expression(Ast_dump_context*) const; | |
2721 | ||
e440a328 | 2722 | private: |
2723 | // The floating point value. | |
2724 | mpfr_t val_; | |
2725 | // The type so far. | |
2726 | Type* type_; | |
2727 | }; | |
2728 | ||
e440a328 | 2729 | // Return the current type. If we haven't set the type yet, we return |
2730 | // an abstract float type. | |
2731 | ||
2732 | Type* | |
2733 | Float_expression::do_type() | |
2734 | { | |
2735 | if (this->type_ == NULL) | |
2736 | this->type_ = Type::make_abstract_float_type(); | |
2737 | return this->type_; | |
2738 | } | |
2739 | ||
2740 | // Set the type of the float value. Here we may switch from an | |
2741 | // abstract type to a real type. | |
2742 | ||
2743 | void | |
2744 | Float_expression::do_determine_type(const Type_context* context) | |
2745 | { | |
2746 | if (this->type_ != NULL && !this->type_->is_abstract()) | |
2747 | ; | |
2748 | else if (context->type != NULL | |
2749 | && (context->type->integer_type() != NULL | |
2750 | || context->type->float_type() != NULL | |
2751 | || context->type->complex_type() != NULL)) | |
2752 | this->type_ = context->type; | |
2753 | else if (!context->may_be_abstract) | |
48080209 | 2754 | this->type_ = Type::lookup_float_type("float64"); |
e440a328 | 2755 | } |
2756 | ||
e440a328 | 2757 | // Check the type of a float value. |
2758 | ||
2759 | void | |
2760 | Float_expression::do_check_types(Gogo*) | |
2761 | { | |
0c77715b | 2762 | Type* type = this->type_; |
2763 | if (type == NULL) | |
e440a328 | 2764 | return; |
0c77715b | 2765 | Numeric_constant nc; |
2766 | nc.set_float(NULL, this->val_); | |
2767 | if (!nc.set_type(this->type_, true, this->location())) | |
e440a328 | 2768 | this->set_is_error(); |
e440a328 | 2769 | } |
2770 | ||
ea664253 | 2771 | // Get the backend representation for a float constant. |
e440a328 | 2772 | |
ea664253 | 2773 | Bexpression* |
2774 | Float_expression::do_get_backend(Translate_context* context) | |
e440a328 | 2775 | { |
12373dd5 | 2776 | if (this->is_error_expression() |
2777 | || (this->type_ != NULL && this->type_->is_error_type())) | |
2778 | { | |
2779 | go_assert(saw_errors()); | |
2780 | return context->gogo()->backend()->error_expression(); | |
2781 | } | |
2782 | ||
48c2a53a | 2783 | Type* resolved_type; |
e440a328 | 2784 | if (this->type_ != NULL && !this->type_->is_abstract()) |
48c2a53a | 2785 | resolved_type = this->type_; |
e440a328 | 2786 | else if (this->type_ != NULL && this->type_->integer_type() != NULL) |
2787 | { | |
2788 | // We have an abstract integer type. We just hope for the best. | |
48c2a53a | 2789 | resolved_type = Type::lookup_integer_type("int"); |
2790 | } | |
2791 | else if (this->type_ != NULL && this->type_->complex_type() != NULL) | |
2792 | { | |
2793 | // We are converting to an abstract complex type. | |
2794 | resolved_type = Type::lookup_complex_type("complex128"); | |
e440a328 | 2795 | } |
2796 | else | |
2797 | { | |
2798 | // If we still have an abstract type here, then this is being | |
2799 | // used in a constant expression which didn't get reduced. We | |
2800 | // just use float64 and hope for the best. | |
48c2a53a | 2801 | resolved_type = Type::lookup_float_type("float64"); |
e440a328 | 2802 | } |
48c2a53a | 2803 | |
2804 | Numeric_constant nc; | |
2805 | nc.set_float(resolved_type, this->val_); | |
ea664253 | 2806 | return Expression::backend_numeric_constant_expression(context, &nc); |
e440a328 | 2807 | } |
2808 | ||
8b1c301d | 2809 | // Write a floating point number to a string dump. |
e440a328 | 2810 | |
2811 | void | |
8b1c301d | 2812 | Float_expression::export_float(String_dump *exp, const mpfr_t val) |
e440a328 | 2813 | { |
2814 | mp_exp_t exponent; | |
2815 | char* s = mpfr_get_str(NULL, &exponent, 10, 0, val, GMP_RNDN); | |
2816 | if (*s == '-') | |
2817 | exp->write_c_string("-"); | |
2818 | exp->write_c_string("0."); | |
2819 | exp->write_c_string(*s == '-' ? s + 1 : s); | |
2820 | mpfr_free_str(s); | |
2821 | char buf[30]; | |
2822 | snprintf(buf, sizeof buf, "E%ld", exponent); | |
2823 | exp->write_c_string(buf); | |
2824 | } | |
2825 | ||
2826 | // Export a floating point number in a constant expression. | |
2827 | ||
2828 | void | |
548be246 | 2829 | Float_expression::do_export(Export_function_body* efb) const |
e440a328 | 2830 | { |
69f634cc | 2831 | bool added_type = false; |
2832 | if (this->type_ != NULL | |
2833 | && !this->type_->is_abstract() | |
2834 | && this->type_ != efb->type_context()) | |
2835 | { | |
2836 | efb->write_c_string("$convert("); | |
2837 | efb->write_type(this->type_); | |
2838 | efb->write_c_string(", "); | |
2839 | added_type = true; | |
2840 | } | |
2841 | ||
548be246 | 2842 | Float_expression::export_float(efb, this->val_); |
e440a328 | 2843 | // A trailing space lets us reliably identify the end of the number. |
548be246 | 2844 | efb->write_c_string(" "); |
69f634cc | 2845 | |
2846 | if (added_type) | |
2847 | efb->write_c_string(")"); | |
e440a328 | 2848 | } |
2849 | ||
d751bb78 | 2850 | // Dump a floating point number to the dump file. |
2851 | ||
2852 | void | |
2853 | Float_expression::do_dump_expression(Ast_dump_context* ast_dump_context) const | |
2854 | { | |
8b1c301d | 2855 | Float_expression::export_float(ast_dump_context, this->val_); |
d751bb78 | 2856 | } |
2857 | ||
e440a328 | 2858 | // Make a float expression. |
2859 | ||
2860 | Expression* | |
b13c66cd | 2861 | Expression::make_float(const mpfr_t* val, Type* type, Location location) |
e440a328 | 2862 | { |
2863 | return new Float_expression(val, type, location); | |
2864 | } | |
2865 | ||
2866 | // Complex numbers. | |
2867 | ||
2868 | class Complex_expression : public Expression | |
2869 | { | |
2870 | public: | |
fcbea5e4 | 2871 | Complex_expression(const mpc_t* val, Type* type, Location location) |
e440a328 | 2872 | : Expression(EXPRESSION_COMPLEX, location), |
2873 | type_(type) | |
2874 | { | |
fcbea5e4 | 2875 | mpc_init2(this->val_, mpc_precision); |
2876 | mpc_set(this->val_, *val, MPC_RNDNN); | |
e440a328 | 2877 | } |
2878 | ||
fcbea5e4 | 2879 | // Write VAL to string dump. |
e440a328 | 2880 | static void |
fcbea5e4 | 2881 | export_complex(String_dump* exp, const mpc_t val); |
e440a328 | 2882 | |
d751bb78 | 2883 | // Write REAL/IMAG to dump context. |
2884 | static void | |
fcbea5e4 | 2885 | dump_complex(Ast_dump_context* ast_dump_context, const mpc_t val); |
66b1ea95 | 2886 | |
e440a328 | 2887 | protected: |
2888 | bool | |
2889 | do_is_constant() const | |
2890 | { return true; } | |
2891 | ||
d2199dbc | 2892 | bool |
2893 | do_is_zero_value() const | |
2894 | { | |
2895 | return mpfr_zero_p(mpc_realref(this->val_)) != 0 | |
2896 | && mpfr_signbit(mpc_realref(this->val_)) == 0 | |
2897 | && mpfr_zero_p(mpc_imagref(this->val_)) != 0 | |
2898 | && mpfr_signbit(mpc_imagref(this->val_)) == 0; | |
2899 | } | |
2900 | ||
0e168074 | 2901 | bool |
3ae06f68 | 2902 | do_is_static_initializer() const |
0e168074 | 2903 | { return true; } |
2904 | ||
e440a328 | 2905 | bool |
0c77715b | 2906 | do_numeric_constant_value(Numeric_constant* nc) const |
2907 | { | |
fcbea5e4 | 2908 | nc->set_complex(this->type_, this->val_); |
0c77715b | 2909 | return true; |
2910 | } | |
e440a328 | 2911 | |
2912 | Type* | |
2913 | do_type(); | |
2914 | ||
2915 | void | |
2916 | do_determine_type(const Type_context*); | |
2917 | ||
2918 | void | |
2919 | do_check_types(Gogo*); | |
2920 | ||
2921 | Expression* | |
2922 | do_copy() | |
2923 | { | |
de590a61 | 2924 | return Expression::make_complex(&this->val_, |
2925 | (this->type_ == NULL | |
2926 | ? NULL | |
2927 | : this->type_->copy_expressions()), | |
e440a328 | 2928 | this->location()); |
2929 | } | |
2930 | ||
ea664253 | 2931 | Bexpression* |
2932 | do_get_backend(Translate_context*); | |
e440a328 | 2933 | |
5f6f5357 | 2934 | int |
2935 | do_inlining_cost() const | |
2936 | { return 2; } | |
2937 | ||
e440a328 | 2938 | void |
548be246 | 2939 | do_export(Export_function_body*) const; |
e440a328 | 2940 | |
d751bb78 | 2941 | void |
2942 | do_dump_expression(Ast_dump_context*) const; | |
abd26de0 | 2943 | |
e440a328 | 2944 | private: |
fcbea5e4 | 2945 | // The complex value. |
2946 | mpc_t val_; | |
e440a328 | 2947 | // The type if known. |
2948 | Type* type_; | |
2949 | }; | |
2950 | ||
e440a328 | 2951 | // Return the current type. If we haven't set the type yet, we return |
2952 | // an abstract complex type. | |
2953 | ||
2954 | Type* | |
2955 | Complex_expression::do_type() | |
2956 | { | |
2957 | if (this->type_ == NULL) | |
2958 | this->type_ = Type::make_abstract_complex_type(); | |
2959 | return this->type_; | |
2960 | } | |
2961 | ||
2962 | // Set the type of the complex value. Here we may switch from an | |
2963 | // abstract type to a real type. | |
2964 | ||
2965 | void | |
2966 | Complex_expression::do_determine_type(const Type_context* context) | |
2967 | { | |
2968 | if (this->type_ != NULL && !this->type_->is_abstract()) | |
2969 | ; | |
abd26de0 | 2970 | else if (context->type != NULL && context->type->is_numeric_type()) |
e440a328 | 2971 | this->type_ = context->type; |
2972 | else if (!context->may_be_abstract) | |
48080209 | 2973 | this->type_ = Type::lookup_complex_type("complex128"); |
e440a328 | 2974 | } |
2975 | ||
e440a328 | 2976 | // Check the type of a complex value. |
2977 | ||
2978 | void | |
2979 | Complex_expression::do_check_types(Gogo*) | |
2980 | { | |
0c77715b | 2981 | Type* type = this->type_; |
2982 | if (type == NULL) | |
e440a328 | 2983 | return; |
0c77715b | 2984 | Numeric_constant nc; |
fcbea5e4 | 2985 | nc.set_complex(NULL, this->val_); |
0c77715b | 2986 | if (!nc.set_type(this->type_, true, this->location())) |
e440a328 | 2987 | this->set_is_error(); |
2988 | } | |
2989 | ||
ea664253 | 2990 | // Get the backend representation for a complex constant. |
e440a328 | 2991 | |
ea664253 | 2992 | Bexpression* |
2993 | Complex_expression::do_get_backend(Translate_context* context) | |
e440a328 | 2994 | { |
12373dd5 | 2995 | if (this->is_error_expression() |
2996 | || (this->type_ != NULL && this->type_->is_error_type())) | |
2997 | { | |
2998 | go_assert(saw_errors()); | |
2999 | return context->gogo()->backend()->error_expression(); | |
3000 | } | |
3001 | ||
48c2a53a | 3002 | Type* resolved_type; |
e440a328 | 3003 | if (this->type_ != NULL && !this->type_->is_abstract()) |
48c2a53a | 3004 | resolved_type = this->type_; |
3005 | else if (this->type_ != NULL && this->type_->integer_type() != NULL) | |
3006 | { | |
3007 | // We are converting to an abstract integer type. | |
3008 | resolved_type = Type::lookup_integer_type("int"); | |
3009 | } | |
3010 | else if (this->type_ != NULL && this->type_->float_type() != NULL) | |
3011 | { | |
3012 | // We are converting to an abstract float type. | |
3013 | resolved_type = Type::lookup_float_type("float64"); | |
3014 | } | |
e440a328 | 3015 | else |
3016 | { | |
47ae02b7 | 3017 | // If we still have an abstract type here, this is being |
e440a328 | 3018 | // used in a constant expression which didn't get reduced. We |
3019 | // just use complex128 and hope for the best. | |
48c2a53a | 3020 | resolved_type = Type::lookup_complex_type("complex128"); |
e440a328 | 3021 | } |
48c2a53a | 3022 | |
3023 | Numeric_constant nc; | |
fcbea5e4 | 3024 | nc.set_complex(resolved_type, this->val_); |
ea664253 | 3025 | return Expression::backend_numeric_constant_expression(context, &nc); |
e440a328 | 3026 | } |
3027 | ||
3028 | // Write REAL/IMAG to export data. | |
3029 | ||
3030 | void | |
fcbea5e4 | 3031 | Complex_expression::export_complex(String_dump* exp, const mpc_t val) |
e440a328 | 3032 | { |
fcbea5e4 | 3033 | if (!mpfr_zero_p(mpc_realref(val))) |
e440a328 | 3034 | { |
fcbea5e4 | 3035 | Float_expression::export_float(exp, mpc_realref(val)); |
d1db782d | 3036 | if (mpfr_sgn(mpc_imagref(val)) >= 0) |
e440a328 | 3037 | exp->write_c_string("+"); |
3038 | } | |
fcbea5e4 | 3039 | Float_expression::export_float(exp, mpc_imagref(val)); |
e440a328 | 3040 | exp->write_c_string("i"); |
3041 | } | |
3042 | ||
3043 | // Export a complex number in a constant expression. | |
3044 | ||
3045 | void | |
548be246 | 3046 | Complex_expression::do_export(Export_function_body* efb) const |
e440a328 | 3047 | { |
69f634cc | 3048 | bool added_type = false; |
3049 | if (this->type_ != NULL | |
3050 | && !this->type_->is_abstract() | |
3051 | && this->type_ != efb->type_context()) | |
3052 | { | |
3053 | efb->write_c_string("$convert("); | |
3054 | efb->write_type(this->type_); | |
3055 | efb->write_c_string(", "); | |
3056 | added_type = true; | |
3057 | } | |
3058 | ||
548be246 | 3059 | Complex_expression::export_complex(efb, this->val_); |
e440a328 | 3060 | // A trailing space lets us reliably identify the end of the number. |
548be246 | 3061 | efb->write_c_string(" "); |
69f634cc | 3062 | |
3063 | if (added_type) | |
3064 | efb->write_c_string(")"); | |
e440a328 | 3065 | } |
3066 | ||
d751bb78 | 3067 | // Dump a complex expression to the dump file. |
3068 | ||
3069 | void | |
3070 | Complex_expression::do_dump_expression(Ast_dump_context* ast_dump_context) const | |
3071 | { | |
fcbea5e4 | 3072 | Complex_expression::export_complex(ast_dump_context, this->val_); |
d751bb78 | 3073 | } |
3074 | ||
e440a328 | 3075 | // Make a complex expression. |
3076 | ||
3077 | Expression* | |
fcbea5e4 | 3078 | Expression::make_complex(const mpc_t* val, Type* type, Location location) |
e440a328 | 3079 | { |
fcbea5e4 | 3080 | return new Complex_expression(val, type, location); |
e440a328 | 3081 | } |
3082 | ||
d5b605df | 3083 | // Find a named object in an expression. |
3084 | ||
3085 | class Find_named_object : public Traverse | |
3086 | { | |
3087 | public: | |
3088 | Find_named_object(Named_object* no) | |
3089 | : Traverse(traverse_expressions), | |
3090 | no_(no), found_(false) | |
3091 | { } | |
3092 | ||
3093 | // Whether we found the object. | |
3094 | bool | |
3095 | found() const | |
3096 | { return this->found_; } | |
3097 | ||
3098 | protected: | |
3099 | int | |
3100 | expression(Expression**); | |
3101 | ||
3102 | private: | |
3103 | // The object we are looking for. | |
3104 | Named_object* no_; | |
3105 | // Whether we found it. | |
3106 | bool found_; | |
3107 | }; | |
3108 | ||
e440a328 | 3109 | // A reference to a const in an expression. |
3110 | ||
3111 | class Const_expression : public Expression | |
3112 | { | |
3113 | public: | |
b13c66cd | 3114 | Const_expression(Named_object* constant, Location location) |
e440a328 | 3115 | : Expression(EXPRESSION_CONST_REFERENCE, location), |
13e818f5 | 3116 | constant_(constant), type_(NULL), seen_(false) |
e440a328 | 3117 | { } |
3118 | ||
d5b605df | 3119 | Named_object* |
3120 | named_object() | |
3121 | { return this->constant_; } | |
3122 | ||
a7f064d5 | 3123 | // Check that the initializer does not refer to the constant itself. |
3124 | void | |
3125 | check_for_init_loop(); | |
3126 | ||
e440a328 | 3127 | protected: |
ba4aedd4 | 3128 | int |
3129 | do_traverse(Traverse*); | |
3130 | ||
e440a328 | 3131 | Expression* |
ceeb4318 | 3132 | do_lower(Gogo*, Named_object*, Statement_inserter*, int); |
e440a328 | 3133 | |
3134 | bool | |
3135 | do_is_constant() const | |
3136 | { return true; } | |
3137 | ||
d2199dbc | 3138 | bool |
3139 | do_is_zero_value() const | |
3140 | { return this->constant_->const_value()->expr()->is_zero_value(); } | |
3141 | ||
0e168074 | 3142 | bool |
3ae06f68 | 3143 | do_is_static_initializer() const |
0e168074 | 3144 | { return true; } |
3145 | ||
e440a328 | 3146 | bool |
0c77715b | 3147 | do_numeric_constant_value(Numeric_constant* nc) const; |
e440a328 | 3148 | |
3149 | bool | |
af6b489a | 3150 | do_string_constant_value(std::string* val) const; |
e440a328 | 3151 | |
ac7ef97d | 3152 | bool |
3153 | do_boolean_constant_value(bool* val) const; | |
3154 | ||
e440a328 | 3155 | Type* |
3156 | do_type(); | |
3157 | ||
3158 | // The type of a const is set by the declaration, not the use. | |
3159 | void | |
3160 | do_determine_type(const Type_context*); | |
3161 | ||
3162 | void | |
3163 | do_check_types(Gogo*); | |
3164 | ||
3165 | Expression* | |
3166 | do_copy() | |
3167 | { return this; } | |
3168 | ||
ea664253 | 3169 | Bexpression* |
3170 | do_get_backend(Translate_context* context); | |
e440a328 | 3171 | |
3172 | // When exporting a reference to a const as part of a const | |
3173 | // expression, we export the value. We ignore the fact that it has | |
3174 | // a name. | |
3175 | void | |
548be246 | 3176 | do_export(Export_function_body* efb) const |
3177 | { this->constant_->const_value()->expr()->export_expression(efb); } | |
e440a328 | 3178 | |
d751bb78 | 3179 | void |
3180 | do_dump_expression(Ast_dump_context*) const; | |
3181 | ||
e440a328 | 3182 | private: |
3183 | // The constant. | |
3184 | Named_object* constant_; | |
3185 | // The type of this reference. This is used if the constant has an | |
3186 | // abstract type. | |
3187 | Type* type_; | |
13e818f5 | 3188 | // Used to prevent infinite recursion when a constant incorrectly |
3189 | // refers to itself. | |
3190 | mutable bool seen_; | |
e440a328 | 3191 | }; |
3192 | ||
ba4aedd4 | 3193 | // Traversal. |
3194 | ||
3195 | int | |
3196 | Const_expression::do_traverse(Traverse* traverse) | |
3197 | { | |
3198 | if (this->type_ != NULL) | |
3199 | return Type::traverse(this->type_, traverse); | |
3200 | return TRAVERSE_CONTINUE; | |
3201 | } | |
3202 | ||
e440a328 | 3203 | // Lower a constant expression. This is where we convert the |
3204 | // predeclared constant iota into an integer value. | |
3205 | ||
3206 | Expression* | |
ceeb4318 | 3207 | Const_expression::do_lower(Gogo* gogo, Named_object*, |
3208 | Statement_inserter*, int iota_value) | |
e440a328 | 3209 | { |
3210 | if (this->constant_->const_value()->expr()->classification() | |
3211 | == EXPRESSION_IOTA) | |
3212 | { | |
3213 | if (iota_value == -1) | |
3214 | { | |
631d5788 | 3215 | go_error_at(this->location(), |
3216 | "iota is only defined in const declarations"); | |
e440a328 | 3217 | iota_value = 0; |
3218 | } | |
e67508fa | 3219 | return Expression::make_integer_ul(iota_value, NULL, this->location()); |
e440a328 | 3220 | } |
3221 | ||
3222 | // Make sure that the constant itself has been lowered. | |
3223 | gogo->lower_constant(this->constant_); | |
3224 | ||
3225 | return this; | |
3226 | } | |
3227 | ||
0c77715b | 3228 | // Return a numeric constant value. |
e440a328 | 3229 | |
3230 | bool | |
0c77715b | 3231 | Const_expression::do_numeric_constant_value(Numeric_constant* nc) const |
e440a328 | 3232 | { |
13e818f5 | 3233 | if (this->seen_) |
3234 | return false; | |
3235 | ||
e440a328 | 3236 | Expression* e = this->constant_->const_value()->expr(); |
f03a9fbf | 3237 | |
13e818f5 | 3238 | this->seen_ = true; |
3239 | ||
0c77715b | 3240 | bool r = e->numeric_constant_value(nc); |
e440a328 | 3241 | |
13e818f5 | 3242 | this->seen_ = false; |
3243 | ||
e440a328 | 3244 | Type* ctype; |
3245 | if (this->type_ != NULL) | |
3246 | ctype = this->type_; | |
3247 | else | |
3248 | ctype = this->constant_->const_value()->type(); | |
e440a328 | 3249 | if (r && ctype != NULL) |
3250 | { | |
0c77715b | 3251 | if (!nc->set_type(ctype, false, this->location())) |
e440a328 | 3252 | return false; |
e440a328 | 3253 | } |
e440a328 | 3254 | |
e440a328 | 3255 | return r; |
3256 | } | |
3257 | ||
af6b489a | 3258 | bool |
3259 | Const_expression::do_string_constant_value(std::string* val) const | |
3260 | { | |
3261 | if (this->seen_) | |
3262 | return false; | |
3263 | ||
3264 | Expression* e = this->constant_->const_value()->expr(); | |
3265 | ||
3266 | this->seen_ = true; | |
3267 | bool ok = e->string_constant_value(val); | |
3268 | this->seen_ = false; | |
3269 | ||
3270 | return ok; | |
3271 | } | |
3272 | ||
ac7ef97d | 3273 | bool |
3274 | Const_expression::do_boolean_constant_value(bool* val) const | |
3275 | { | |
3276 | if (this->seen_) | |
3277 | return false; | |
3278 | ||
3279 | Expression* e = this->constant_->const_value()->expr(); | |
3280 | ||
3281 | this->seen_ = true; | |
3282 | bool ok = e->boolean_constant_value(val); | |
3283 | this->seen_ = false; | |
3284 | ||
3285 | return ok; | |
3286 | } | |
3287 | ||
e440a328 | 3288 | // Return the type of the const reference. |
3289 | ||
3290 | Type* | |
3291 | Const_expression::do_type() | |
3292 | { | |
3293 | if (this->type_ != NULL) | |
3294 | return this->type_; | |
13e818f5 | 3295 | |
2f78f012 | 3296 | Named_constant* nc = this->constant_->const_value(); |
3297 | ||
3298 | if (this->seen_ || nc->lowering()) | |
13e818f5 | 3299 | { |
4b2ab536 | 3300 | if (nc->type() == NULL || !nc->type()->is_error_type()) |
3301 | { | |
3302 | Location loc = this->location(); | |
3303 | if (!this->seen_) | |
3304 | loc = nc->location(); | |
3305 | go_error_at(loc, "constant refers to itself"); | |
3306 | } | |
3307 | this->set_is_error(); | |
13e818f5 | 3308 | this->type_ = Type::make_error_type(); |
4b2ab536 | 3309 | nc->set_type(this->type_); |
13e818f5 | 3310 | return this->type_; |
3311 | } | |
3312 | ||
3313 | this->seen_ = true; | |
3314 | ||
e440a328 | 3315 | Type* ret = nc->type(); |
13e818f5 | 3316 | |
e440a328 | 3317 | if (ret != NULL) |
13e818f5 | 3318 | { |
3319 | this->seen_ = false; | |
3320 | return ret; | |
3321 | } | |
3322 | ||
e440a328 | 3323 | // During parsing, a named constant may have a NULL type, but we |
3324 | // must not return a NULL type here. | |
13e818f5 | 3325 | ret = nc->expr()->type(); |
3326 | ||
3327 | this->seen_ = false; | |
3328 | ||
4b2ab536 | 3329 | if (ret->is_error_type()) |
3330 | nc->set_type(ret); | |
3331 | ||
13e818f5 | 3332 | return ret; |
e440a328 | 3333 | } |
3334 | ||
3335 | // Set the type of the const reference. | |
3336 | ||
3337 | void | |
3338 | Const_expression::do_determine_type(const Type_context* context) | |
3339 | { | |
3340 | Type* ctype = this->constant_->const_value()->type(); | |
3341 | Type* cetype = (ctype != NULL | |
3342 | ? ctype | |
3343 | : this->constant_->const_value()->expr()->type()); | |
3344 | if (ctype != NULL && !ctype->is_abstract()) | |
3345 | ; | |
3346 | else if (context->type != NULL | |
0c77715b | 3347 | && context->type->is_numeric_type() |
3348 | && cetype->is_numeric_type()) | |
e440a328 | 3349 | this->type_ = context->type; |
3350 | else if (context->type != NULL | |
3351 | && context->type->is_string_type() | |
3352 | && cetype->is_string_type()) | |
3353 | this->type_ = context->type; | |
3354 | else if (context->type != NULL | |
3355 | && context->type->is_boolean_type() | |
3356 | && cetype->is_boolean_type()) | |
3357 | this->type_ = context->type; | |
3358 | else if (!context->may_be_abstract) | |
3359 | { | |
3360 | if (cetype->is_abstract()) | |
3361 | cetype = cetype->make_non_abstract_type(); | |
3362 | this->type_ = cetype; | |
3363 | } | |
3364 | } | |
3365 | ||
a7f064d5 | 3366 | // Check for a loop in which the initializer of a constant refers to |
3367 | // the constant itself. | |
e440a328 | 3368 | |
3369 | void | |
a7f064d5 | 3370 | Const_expression::check_for_init_loop() |
e440a328 | 3371 | { |
5c13bd80 | 3372 | if (this->type_ != NULL && this->type_->is_error()) |
d5b605df | 3373 | return; |
3374 | ||
a7f064d5 | 3375 | if (this->seen_) |
3376 | { | |
3377 | this->report_error(_("constant refers to itself")); | |
3378 | this->type_ = Type::make_error_type(); | |
3379 | return; | |
3380 | } | |
3381 | ||
d5b605df | 3382 | Expression* init = this->constant_->const_value()->expr(); |
3383 | Find_named_object find_named_object(this->constant_); | |
a7f064d5 | 3384 | |
3385 | this->seen_ = true; | |
d5b605df | 3386 | Expression::traverse(&init, &find_named_object); |
a7f064d5 | 3387 | this->seen_ = false; |
3388 | ||
d5b605df | 3389 | if (find_named_object.found()) |
3390 | { | |
5c13bd80 | 3391 | if (this->type_ == NULL || !this->type_->is_error()) |
a7f064d5 | 3392 | { |
3393 | this->report_error(_("constant refers to itself")); | |
3394 | this->type_ = Type::make_error_type(); | |
3395 | } | |
d5b605df | 3396 | return; |
3397 | } | |
a7f064d5 | 3398 | } |
3399 | ||
3400 | // Check types of a const reference. | |
3401 | ||
3402 | void | |
3403 | Const_expression::do_check_types(Gogo*) | |
3404 | { | |
5c13bd80 | 3405 | if (this->type_ != NULL && this->type_->is_error()) |
a7f064d5 | 3406 | return; |
3407 | ||
3408 | this->check_for_init_loop(); | |
d5b605df | 3409 | |
0c77715b | 3410 | // Check that numeric constant fits in type. |
3411 | if (this->type_ != NULL && this->type_->is_numeric_type()) | |
e440a328 | 3412 | { |
0c77715b | 3413 | Numeric_constant nc; |
3414 | if (this->constant_->const_value()->expr()->numeric_constant_value(&nc)) | |
e440a328 | 3415 | { |
0c77715b | 3416 | if (!nc.set_type(this->type_, true, this->location())) |
3417 | this->set_is_error(); | |
e440a328 | 3418 | } |
e440a328 | 3419 | } |
3420 | } | |
3421 | ||
ea664253 | 3422 | // Return the backend representation for a const reference. |
e440a328 | 3423 | |
ea664253 | 3424 | Bexpression* |
3425 | Const_expression::do_get_backend(Translate_context* context) | |
e440a328 | 3426 | { |
12373dd5 | 3427 | if (this->is_error_expression() |
3428 | || (this->type_ != NULL && this->type_->is_error())) | |
3429 | { | |
3430 | go_assert(saw_errors()); | |
3431 | return context->backend()->error_expression(); | |
3432 | } | |
e440a328 | 3433 | |
3434 | // If the type has been set for this expression, but the underlying | |
3435 | // object is an abstract int or float, we try to get the abstract | |
3436 | // value. Otherwise we may lose something in the conversion. | |
f2de4532 | 3437 | Expression* expr = this->constant_->const_value()->expr(); |
e440a328 | 3438 | if (this->type_ != NULL |
0c77715b | 3439 | && this->type_->is_numeric_type() |
a68492b4 | 3440 | && (this->constant_->const_value()->type() == NULL |
3441 | || this->constant_->const_value()->type()->is_abstract())) | |
e440a328 | 3442 | { |
0c77715b | 3443 | Numeric_constant nc; |
3444 | if (expr->numeric_constant_value(&nc) | |
3445 | && nc.set_type(this->type_, false, this->location())) | |
e440a328 | 3446 | { |
0c77715b | 3447 | Expression* e = nc.expression(this->location()); |
ea664253 | 3448 | return e->get_backend(context); |
e440a328 | 3449 | } |
e440a328 | 3450 | } |
3451 | ||
2c809f8f | 3452 | if (this->type_ != NULL) |
f2de4532 | 3453 | expr = Expression::make_cast(this->type_, expr, this->location()); |
ea664253 | 3454 | return expr->get_backend(context); |
e440a328 | 3455 | } |
3456 | ||
d751bb78 | 3457 | // Dump ast representation for constant expression. |
3458 | ||
3459 | void | |
3460 | Const_expression::do_dump_expression(Ast_dump_context* ast_dump_context) const | |
3461 | { | |
3462 | ast_dump_context->ostream() << this->constant_->name(); | |
3463 | } | |
3464 | ||
e440a328 | 3465 | // Make a reference to a constant in an expression. |
3466 | ||
3467 | Expression* | |
3468 | Expression::make_const_reference(Named_object* constant, | |
b13c66cd | 3469 | Location location) |
e440a328 | 3470 | { |
3471 | return new Const_expression(constant, location); | |
3472 | } | |
3473 | ||
d5b605df | 3474 | // Find a named object in an expression. |
3475 | ||
3476 | int | |
3477 | Find_named_object::expression(Expression** pexpr) | |
3478 | { | |
3479 | switch ((*pexpr)->classification()) | |
3480 | { | |
3481 | case Expression::EXPRESSION_CONST_REFERENCE: | |
a7f064d5 | 3482 | { |
3483 | Const_expression* ce = static_cast<Const_expression*>(*pexpr); | |
3484 | if (ce->named_object() == this->no_) | |
3485 | break; | |
3486 | ||
3487 | // We need to check a constant initializer explicitly, as | |
3488 | // loops here will not be caught by the loop checking for | |
3489 | // variable initializers. | |
3490 | ce->check_for_init_loop(); | |
3491 | ||
3492 | return TRAVERSE_CONTINUE; | |
3493 | } | |
3494 | ||
d5b605df | 3495 | case Expression::EXPRESSION_VAR_REFERENCE: |
3496 | if ((*pexpr)->var_expression()->named_object() == this->no_) | |
3497 | break; | |
3498 | return TRAVERSE_CONTINUE; | |
3499 | case Expression::EXPRESSION_FUNC_REFERENCE: | |
3500 | if ((*pexpr)->func_expression()->named_object() == this->no_) | |
3501 | break; | |
3502 | return TRAVERSE_CONTINUE; | |
3503 | default: | |
3504 | return TRAVERSE_CONTINUE; | |
3505 | } | |
3506 | this->found_ = true; | |
3507 | return TRAVERSE_EXIT; | |
3508 | } | |
3509 | ||
e440a328 | 3510 | // The nil value. |
3511 | ||
3512 | class Nil_expression : public Expression | |
3513 | { | |
3514 | public: | |
b13c66cd | 3515 | Nil_expression(Location location) |
e440a328 | 3516 | : Expression(EXPRESSION_NIL, location) |
3517 | { } | |
3518 | ||
3519 | static Expression* | |
bc8e2ef4 | 3520 | do_import(Import_expression*, Location); |
e440a328 | 3521 | |
3522 | protected: | |
3523 | bool | |
3524 | do_is_constant() const | |
3525 | { return true; } | |
3526 | ||
d2199dbc | 3527 | bool |
3528 | do_is_zero_value() const | |
3529 | { return true; } | |
3530 | ||
f9ca30f9 | 3531 | bool |
3ae06f68 | 3532 | do_is_static_initializer() const |
f9ca30f9 | 3533 | { return true; } |
3534 | ||
e440a328 | 3535 | Type* |
3536 | do_type() | |
3537 | { return Type::make_nil_type(); } | |
3538 | ||
3539 | void | |
3540 | do_determine_type(const Type_context*) | |
3541 | { } | |
3542 | ||
3543 | Expression* | |
3544 | do_copy() | |
3545 | { return this; } | |
3546 | ||
ea664253 | 3547 | Bexpression* |
3548 | do_get_backend(Translate_context* context) | |
3549 | { return context->backend()->nil_pointer_expression(); } | |
e440a328 | 3550 | |
5f6f5357 | 3551 | int |
3552 | do_inlining_cost() const | |
3553 | { return 1; } | |
3554 | ||
e440a328 | 3555 | void |
548be246 | 3556 | do_export(Export_function_body* efb) const |
204d4af4 | 3557 | { efb->write_c_string("$nil"); } |
d751bb78 | 3558 | |
3559 | void | |
3560 | do_dump_expression(Ast_dump_context* ast_dump_context) const | |
3561 | { ast_dump_context->ostream() << "nil"; } | |
e440a328 | 3562 | }; |
3563 | ||
3564 | // Import a nil expression. | |
3565 | ||
3566 | Expression* | |
bc8e2ef4 | 3567 | Nil_expression::do_import(Import_expression* imp, Location loc) |
e440a328 | 3568 | { |
204d4af4 | 3569 | if (imp->version() >= EXPORT_FORMAT_V3) |
3570 | imp->require_c_string("$"); | |
e440a328 | 3571 | imp->require_c_string("nil"); |
9b92780c | 3572 | return Expression::make_nil(loc); |
e440a328 | 3573 | } |
3574 | ||
3575 | // Make a nil expression. | |
3576 | ||
3577 | Expression* | |
b13c66cd | 3578 | Expression::make_nil(Location location) |
e440a328 | 3579 | { |
3580 | return new Nil_expression(location); | |
3581 | } | |
3582 | ||
3583 | // The value of the predeclared constant iota. This is little more | |
3584 | // than a marker. This will be lowered to an integer in | |
3585 | // Const_expression::do_lower, which is where we know the value that | |
3586 | // it should have. | |
3587 | ||
3588 | class Iota_expression : public Parser_expression | |
3589 | { | |
3590 | public: | |
b13c66cd | 3591 | Iota_expression(Location location) |
e440a328 | 3592 | : Parser_expression(EXPRESSION_IOTA, location) |
3593 | { } | |
3594 | ||
3595 | protected: | |
3596 | Expression* | |
ceeb4318 | 3597 | do_lower(Gogo*, Named_object*, Statement_inserter*, int) |
c3e6f413 | 3598 | { go_unreachable(); } |
e440a328 | 3599 | |
3600 | // There should only ever be one of these. | |
3601 | Expression* | |
3602 | do_copy() | |
c3e6f413 | 3603 | { go_unreachable(); } |
f03a9fbf | 3604 | |
d751bb78 | 3605 | void |
3606 | do_dump_expression(Ast_dump_context* ast_dump_context) const | |
f03a9fbf | 3607 | { ast_dump_context->ostream() << "iota"; } |
e440a328 | 3608 | }; |
3609 | ||
3610 | // Make an iota expression. This is only called for one case: the | |
3611 | // value of the predeclared constant iota. | |
3612 | ||
3613 | Expression* | |
3614 | Expression::make_iota() | |
3615 | { | |
b13c66cd | 3616 | static Iota_expression iota_expression(Linemap::unknown_location()); |
e440a328 | 3617 | return &iota_expression; |
3618 | } | |
3619 | ||
da244e59 | 3620 | // Class Type_conversion_expression. |
e440a328 | 3621 | |
3622 | // Traversal. | |
3623 | ||
3624 | int | |
3625 | Type_conversion_expression::do_traverse(Traverse* traverse) | |
3626 | { | |
3627 | if (Expression::traverse(&this->expr_, traverse) == TRAVERSE_EXIT | |
3628 | || Type::traverse(this->type_, traverse) == TRAVERSE_EXIT) | |
3629 | return TRAVERSE_EXIT; | |
3630 | return TRAVERSE_CONTINUE; | |
3631 | } | |
3632 | ||
3633 | // Convert to a constant at lowering time. | |
3634 | ||
3635 | Expression* | |
ceeb4318 | 3636 | Type_conversion_expression::do_lower(Gogo*, Named_object*, |
3637 | Statement_inserter*, int) | |
e440a328 | 3638 | { |
3639 | Type* type = this->type_; | |
3640 | Expression* val = this->expr_; | |
b13c66cd | 3641 | Location location = this->location(); |
e440a328 | 3642 | |
0c77715b | 3643 | if (type->is_numeric_type()) |
e440a328 | 3644 | { |
0c77715b | 3645 | Numeric_constant nc; |
3646 | if (val->numeric_constant_value(&nc)) | |
e440a328 | 3647 | { |
0c77715b | 3648 | if (!nc.set_type(type, true, location)) |
3649 | return Expression::make_error(location); | |
3650 | return nc.expression(location); | |
e440a328 | 3651 | } |
e440a328 | 3652 | } |
3653 | ||
d7739c9a | 3654 | // According to the language specification on string conversions |
3655 | // (http://golang.org/ref/spec#Conversions_to_and_from_a_string_type): | |
3656 | // When converting an integer into a string, the string will be a UTF-8 | |
3657 | // representation of the integer and integers "outside the range of valid | |
3658 | // Unicode code points are converted to '\uFFFD'." | |
3659 | if (type->is_string_type()) | |
3660 | { | |
3661 | Numeric_constant nc; | |
3662 | if (val->numeric_constant_value(&nc) && nc.is_int()) | |
3663 | { | |
3664 | // An integer value doesn't fit in the Unicode code point range if it | |
3665 | // overflows the Go "int" type or is negative. | |
3666 | unsigned long ul; | |
3667 | if (!nc.set_type(Type::lookup_integer_type("int"), false, location) | |
3668 | || nc.to_unsigned_long(&ul) == Numeric_constant::NC_UL_NEGATIVE) | |
3669 | return Expression::make_string("\ufffd", location); | |
3670 | } | |
3671 | } | |
3672 | ||
55072f2b | 3673 | if (type->is_slice_type()) |
e440a328 | 3674 | { |
3675 | Type* element_type = type->array_type()->element_type()->forwarded(); | |
60963afd | 3676 | bool is_byte = (element_type->integer_type() != NULL |
3677 | && element_type->integer_type()->is_byte()); | |
3678 | bool is_rune = (element_type->integer_type() != NULL | |
3679 | && element_type->integer_type()->is_rune()); | |
3680 | if (is_byte || is_rune) | |
e440a328 | 3681 | { |
3682 | std::string s; | |
3683 | if (val->string_constant_value(&s)) | |
3684 | { | |
3685 | Expression_list* vals = new Expression_list(); | |
3686 | if (is_byte) | |
3687 | { | |
3688 | for (std::string::const_iterator p = s.begin(); | |
3689 | p != s.end(); | |
3690 | p++) | |
3691 | { | |
e67508fa | 3692 | unsigned char c = static_cast<unsigned char>(*p); |
3693 | vals->push_back(Expression::make_integer_ul(c, | |
3694 | element_type, | |
3695 | location)); | |
e440a328 | 3696 | } |
3697 | } | |
3698 | else | |
3699 | { | |
3700 | const char *p = s.data(); | |
3701 | const char *pend = s.data() + s.length(); | |
3702 | while (p < pend) | |
3703 | { | |
3704 | unsigned int c; | |
3705 | int adv = Lex::fetch_char(p, &c); | |
3706 | if (adv == 0) | |
3707 | { | |
631d5788 | 3708 | go_warning_at(this->location(), 0, |
e440a328 | 3709 | "invalid UTF-8 encoding"); |
3710 | adv = 1; | |
3711 | } | |
3712 | p += adv; | |
e67508fa | 3713 | vals->push_back(Expression::make_integer_ul(c, |
3714 | element_type, | |
3715 | location)); | |
e440a328 | 3716 | } |
3717 | } | |
3718 | ||
3719 | return Expression::make_slice_composite_literal(type, vals, | |
3720 | location); | |
3721 | } | |
3722 | } | |
3723 | } | |
3724 | ||
3725 | return this; | |
3726 | } | |
3727 | ||
35a54f17 | 3728 | // Flatten a type conversion by using a temporary variable for the slice |
3729 | // in slice to string conversions. | |
3730 | ||
3731 | Expression* | |
3732 | Type_conversion_expression::do_flatten(Gogo*, Named_object*, | |
3733 | Statement_inserter* inserter) | |
3734 | { | |
5bf8be8b | 3735 | if (this->type()->is_error_type() || this->expr_->is_error_expression()) |
3736 | { | |
3737 | go_assert(saw_errors()); | |
3738 | return Expression::make_error(this->location()); | |
3739 | } | |
3740 | ||
2c809f8f | 3741 | if (((this->type()->is_string_type() |
3742 | && this->expr_->type()->is_slice_type()) | |
8ba8cc87 | 3743 | || this->expr_->type()->interface_type() != NULL) |
35a54f17 | 3744 | && !this->expr_->is_variable()) |
3745 | { | |
3746 | Temporary_statement* temp = | |
3747 | Statement::make_temporary(NULL, this->expr_, this->location()); | |
3748 | inserter->insert(temp); | |
3749 | this->expr_ = Expression::make_temporary_reference(temp, this->location()); | |
3750 | } | |
e007b1eb | 3751 | |
20a381c4 | 3752 | // For interface conversion and string to/from slice conversions, |
3753 | // decide if we can allocate on stack. | |
3754 | if (this->type()->interface_type() != NULL | |
3755 | || this->type()->is_string_type() | |
3756 | || this->expr_->type()->is_string_type()) | |
e007b1eb | 3757 | { |
3758 | Node* n = Node::make_node(this); | |
3759 | if ((n->encoding() & ESCAPE_MASK) == Node::ESCAPE_NONE) | |
3760 | this->no_escape_ = true; | |
3761 | } | |
35a54f17 | 3762 | return this; |
3763 | } | |
3764 | ||
1ca01a59 | 3765 | // Return whether a type conversion is a constant. |
3766 | ||
3767 | bool | |
3768 | Type_conversion_expression::do_is_constant() const | |
3769 | { | |
3770 | if (!this->expr_->is_constant()) | |
3771 | return false; | |
3772 | ||
3773 | // A conversion to a type that may not be used as a constant is not | |
3774 | // a constant. For example, []byte(nil). | |
3775 | Type* type = this->type_; | |
3776 | if (type->integer_type() == NULL | |
3777 | && type->float_type() == NULL | |
3778 | && type->complex_type() == NULL | |
3779 | && !type->is_boolean_type() | |
3780 | && !type->is_string_type()) | |
3781 | return false; | |
3782 | ||
3783 | return true; | |
3784 | } | |
3785 | ||
d2199dbc | 3786 | // Return whether a type conversion is a zero value. |
3787 | ||
3788 | bool | |
3789 | Type_conversion_expression::do_is_zero_value() const | |
3790 | { | |
3791 | if (!this->expr_->is_zero_value()) | |
3792 | return false; | |
3793 | ||
3794 | // Some type conversion from zero value is still not zero value. | |
3795 | // For example, []byte("") or interface{}(0). | |
3796 | // Conservatively, only report true if the RHS is nil. | |
3797 | Type* type = this->type_; | |
3798 | if (type->integer_type() == NULL | |
3799 | && type->float_type() == NULL | |
3800 | && type->complex_type() == NULL | |
3801 | && !type->is_boolean_type() | |
3802 | && !type->is_string_type()) | |
3803 | return this->expr_->is_nil_expression(); | |
3804 | ||
3805 | return true; | |
3806 | } | |
3807 | ||
3ae06f68 | 3808 | // Return whether a type conversion can be used in a constant |
3809 | // initializer. | |
0e168074 | 3810 | |
3811 | bool | |
3ae06f68 | 3812 | Type_conversion_expression::do_is_static_initializer() const |
0e168074 | 3813 | { |
3814 | Type* type = this->type_; | |
3815 | Type* expr_type = this->expr_->type(); | |
3816 | ||
3817 | if (type->interface_type() != NULL | |
3818 | || expr_type->interface_type() != NULL) | |
3819 | return false; | |
3820 | ||
3ae06f68 | 3821 | if (!this->expr_->is_static_initializer()) |
0e168074 | 3822 | return false; |
3823 | ||
3a522dcc | 3824 | if (Type::are_identical(type, expr_type, |
3825 | Type::COMPARE_ERRORS | Type::COMPARE_TAGS, | |
3826 | NULL)) | |
0e168074 | 3827 | return true; |
3828 | ||
03118c21 | 3829 | if (type->is_string_type() && expr_type->is_string_type()) |
3830 | return true; | |
3831 | ||
3832 | if ((type->is_numeric_type() | |
3833 | || type->is_boolean_type() | |
3834 | || type->points_to() != NULL) | |
3835 | && (expr_type->is_numeric_type() | |
3836 | || expr_type->is_boolean_type() | |
3837 | || expr_type->points_to() != NULL)) | |
3838 | return true; | |
3839 | ||
3840 | return false; | |
0e168074 | 3841 | } |
3842 | ||
0c77715b | 3843 | // Return the constant numeric value if there is one. |
e440a328 | 3844 | |
3845 | bool | |
0c77715b | 3846 | Type_conversion_expression::do_numeric_constant_value( |
3847 | Numeric_constant* nc) const | |
e440a328 | 3848 | { |
0c77715b | 3849 | if (!this->type_->is_numeric_type()) |
e440a328 | 3850 | return false; |
0c77715b | 3851 | if (!this->expr_->numeric_constant_value(nc)) |
e440a328 | 3852 | return false; |
0c77715b | 3853 | return nc->set_type(this->type_, false, this->location()); |
e440a328 | 3854 | } |
3855 | ||
3856 | // Return the constant string value if there is one. | |
3857 | ||
3858 | bool | |
3859 | Type_conversion_expression::do_string_constant_value(std::string* val) const | |
3860 | { | |
3861 | if (this->type_->is_string_type() | |
3862 | && this->expr_->type()->integer_type() != NULL) | |
3863 | { | |
0c77715b | 3864 | Numeric_constant nc; |
3865 | if (this->expr_->numeric_constant_value(&nc)) | |
e440a328 | 3866 | { |
0c77715b | 3867 | unsigned long ival; |
3868 | if (nc.to_unsigned_long(&ival) == Numeric_constant::NC_UL_VALID) | |
e440a328 | 3869 | { |
0c77715b | 3870 | val->clear(); |
3871 | Lex::append_char(ival, true, val, this->location()); | |
e440a328 | 3872 | return true; |
3873 | } | |
3874 | } | |
e440a328 | 3875 | } |
3876 | ||
3877 | // FIXME: Could handle conversion from const []int here. | |
3878 | ||
3879 | return false; | |
3880 | } | |
3881 | ||
ac7ef97d | 3882 | // Return the constant boolean value if there is one. |
3883 | ||
3884 | bool | |
3885 | Type_conversion_expression::do_boolean_constant_value(bool* val) const | |
3886 | { | |
3887 | if (!this->type_->is_boolean_type()) | |
3888 | return false; | |
3889 | return this->expr_->boolean_constant_value(val); | |
3890 | } | |
3891 | ||
da244e59 | 3892 | // Determine the resulting type of the conversion. |
3893 | ||
3894 | void | |
3895 | Type_conversion_expression::do_determine_type(const Type_context*) | |
3896 | { | |
3897 | Type_context subcontext(this->type_, false); | |
3898 | this->expr_->determine_type(&subcontext); | |
3899 | } | |
3900 | ||
e440a328 | 3901 | // Check that types are convertible. |
3902 | ||
3903 | void | |
3904 | Type_conversion_expression::do_check_types(Gogo*) | |
3905 | { | |
3906 | Type* type = this->type_; | |
3907 | Type* expr_type = this->expr_->type(); | |
3908 | std::string reason; | |
3909 | ||
5c13bd80 | 3910 | if (type->is_error() || expr_type->is_error()) |
842f6425 | 3911 | { |
842f6425 | 3912 | this->set_is_error(); |
3913 | return; | |
3914 | } | |
3915 | ||
e440a328 | 3916 | if (this->may_convert_function_types_ |
3917 | && type->function_type() != NULL | |
3918 | && expr_type->function_type() != NULL) | |
3919 | return; | |
3920 | ||
3921 | if (Type::are_convertible(type, expr_type, &reason)) | |
3922 | return; | |
3923 | ||
631d5788 | 3924 | go_error_at(this->location(), "%s", reason.c_str()); |
e440a328 | 3925 | this->set_is_error(); |
3926 | } | |
3927 | ||
de590a61 | 3928 | // Copy. |
3929 | ||
3930 | Expression* | |
3931 | Type_conversion_expression::do_copy() | |
3932 | { | |
ae77af58 | 3933 | Expression* ret = new Type_conversion_expression(this->type_->copy_expressions(), |
3934 | this->expr_->copy(), | |
3935 | this->location()); | |
3936 | ret->conversion_expression()->set_no_copy(this->no_copy_); | |
3937 | return ret; | |
de590a61 | 3938 | } |
3939 | ||
ea664253 | 3940 | // Get the backend representation for a type conversion. |
e440a328 | 3941 | |
ea664253 | 3942 | Bexpression* |
3943 | Type_conversion_expression::do_get_backend(Translate_context* context) | |
e440a328 | 3944 | { |
e440a328 | 3945 | Type* type = this->type_; |
3946 | Type* expr_type = this->expr_->type(); | |
2c809f8f | 3947 | |
3948 | Gogo* gogo = context->gogo(); | |
3949 | Btype* btype = type->get_backend(gogo); | |
2c809f8f | 3950 | Location loc = this->location(); |
3951 | ||
3a522dcc | 3952 | if (Type::are_identical(type, expr_type, |
3953 | Type::COMPARE_ERRORS | Type::COMPARE_TAGS, | |
3954 | NULL)) | |
859cdc93 | 3955 | { |
3956 | Bexpression* bexpr = this->expr_->get_backend(context); | |
3957 | return gogo->backend()->convert_expression(btype, bexpr, loc); | |
3958 | } | |
e007b1eb | 3959 | else if (type->interface_type() != NULL |
3960 | && expr_type->interface_type() == NULL) | |
3961 | { | |
3962 | Expression* conversion = | |
3963 | Expression::convert_type_to_interface(type, this->expr_, | |
3964 | this->no_escape_, loc); | |
3965 | return conversion->get_backend(context); | |
3966 | } | |
2c809f8f | 3967 | else if (type->interface_type() != NULL |
3968 | || expr_type->interface_type() != NULL) | |
e440a328 | 3969 | { |
2c809f8f | 3970 | Expression* conversion = |
3971 | Expression::convert_for_assignment(gogo, type, this->expr_, | |
e007b1eb | 3972 | loc); |
ea664253 | 3973 | return conversion->get_backend(context); |
e440a328 | 3974 | } |
3975 | else if (type->is_string_type() | |
3976 | && expr_type->integer_type() != NULL) | |
3977 | { | |
2c809f8f | 3978 | mpz_t intval; |
3979 | Numeric_constant nc; | |
3980 | if (this->expr_->numeric_constant_value(&nc) | |
9ee9df22 | 3981 | && nc.to_int(&intval)) |
e440a328 | 3982 | { |
e440a328 | 3983 | std::string s; |
9ee9df22 | 3984 | unsigned int x; |
3985 | if (mpz_fits_uint_p(intval)) | |
3986 | x = mpz_get_ui(intval); | |
3987 | else | |
3988 | { | |
3989 | char* s = mpz_get_str(NULL, 16, intval); | |
3990 | go_warning_at(loc, 0, | |
3991 | "unicode code point 0x%s out of range in string", s); | |
3992 | x = 0xfffd; | |
3993 | } | |
3994 | Lex::append_char(x, true, &s, loc); | |
2c809f8f | 3995 | mpz_clear(intval); |
3996 | Expression* se = Expression::make_string(s, loc); | |
ea664253 | 3997 | return se->get_backend(context); |
e440a328 | 3998 | } |
3999 | ||
20a381c4 | 4000 | Expression* buf; |
4001 | if (this->no_escape_) | |
4002 | { | |
4003 | Type* byte_type = Type::lookup_integer_type("uint8"); | |
4004 | Expression* buflen = | |
4005 | Expression::make_integer_ul(4, NULL, loc); | |
4006 | Type* array_type = Type::make_array_type(byte_type, buflen); | |
4007 | buf = Expression::make_allocation(array_type, loc); | |
4008 | buf->allocation_expression()->set_allocate_on_stack(); | |
4009 | buf->allocation_expression()->set_no_zero(); | |
4010 | } | |
4011 | else | |
4012 | buf = Expression::make_nil(loc); | |
f16ab008 | 4013 | Expression* i2s_expr = |
20a381c4 | 4014 | Runtime::make_call(Runtime::INTSTRING, loc, 2, buf, this->expr_); |
ea664253 | 4015 | return Expression::make_cast(type, i2s_expr, loc)->get_backend(context); |
e440a328 | 4016 | } |
55072f2b | 4017 | else if (type->is_string_type() && expr_type->is_slice_type()) |
e440a328 | 4018 | { |
55072f2b | 4019 | Array_type* a = expr_type->array_type(); |
e440a328 | 4020 | Type* e = a->element_type()->forwarded(); |
c484d925 | 4021 | go_assert(e->integer_type() != NULL); |
35a54f17 | 4022 | go_assert(this->expr_->is_variable()); |
4023 | ||
4024 | Runtime::Function code; | |
60963afd | 4025 | if (e->integer_type()->is_byte()) |
ae77af58 | 4026 | { |
4027 | if (this->no_copy_) | |
4028 | { | |
4029 | if (gogo->debug_optimization()) | |
37188bf9 | 4030 | go_debug(loc, "no copy string([]byte)"); |
ae77af58 | 4031 | Expression* ptr = Expression::make_slice_info(this->expr_, |
4032 | SLICE_INFO_VALUE_POINTER, | |
4033 | loc); | |
4034 | Expression* len = Expression::make_slice_info(this->expr_, | |
4035 | SLICE_INFO_LENGTH, | |
4036 | loc); | |
4037 | Expression* str = Expression::make_string_value(ptr, len, loc); | |
4038 | return str->get_backend(context); | |
4039 | } | |
4040 | code = Runtime::SLICEBYTETOSTRING; | |
4041 | } | |
e440a328 | 4042 | else |
35a54f17 | 4043 | { |
4044 | go_assert(e->integer_type()->is_rune()); | |
736a16ba | 4045 | code = Runtime::SLICERUNETOSTRING; |
35a54f17 | 4046 | } |
20a381c4 | 4047 | |
4048 | Expression* buf; | |
4049 | if (this->no_escape_) | |
4050 | { | |
4051 | Type* byte_type = Type::lookup_integer_type("uint8"); | |
4052 | Expression* buflen = | |
4053 | Expression::make_integer_ul(tmp_string_buf_size, NULL, loc); | |
4054 | Type* array_type = Type::make_array_type(byte_type, buflen); | |
4055 | buf = Expression::make_allocation(array_type, loc); | |
4056 | buf->allocation_expression()->set_allocate_on_stack(); | |
4057 | buf->allocation_expression()->set_no_zero(); | |
4058 | } | |
4059 | else | |
4060 | buf = Expression::make_nil(loc); | |
4061 | return Runtime::make_call(code, loc, 2, buf, | |
736a16ba | 4062 | this->expr_)->get_backend(context); |
e440a328 | 4063 | } |
411eb89e | 4064 | else if (type->is_slice_type() && expr_type->is_string_type()) |
e440a328 | 4065 | { |
4066 | Type* e = type->array_type()->element_type()->forwarded(); | |
c484d925 | 4067 | go_assert(e->integer_type() != NULL); |
6c252e42 | 4068 | |
2c809f8f | 4069 | Runtime::Function code; |
60963afd | 4070 | if (e->integer_type()->is_byte()) |
736a16ba | 4071 | code = Runtime::STRINGTOSLICEBYTE; |
e440a328 | 4072 | else |
4073 | { | |
60963afd | 4074 | go_assert(e->integer_type()->is_rune()); |
736a16ba | 4075 | code = Runtime::STRINGTOSLICERUNE; |
e440a328 | 4076 | } |
20a381c4 | 4077 | |
4078 | Expression* buf; | |
4079 | if (this->no_escape_) | |
4080 | { | |
4081 | Expression* buflen = | |
4082 | Expression::make_integer_ul(tmp_string_buf_size, NULL, loc); | |
4083 | Type* array_type = Type::make_array_type(e, buflen); | |
4084 | buf = Expression::make_allocation(array_type, loc); | |
4085 | buf->allocation_expression()->set_allocate_on_stack(); | |
4086 | buf->allocation_expression()->set_no_zero(); | |
4087 | } | |
4088 | else | |
4089 | buf = Expression::make_nil(loc); | |
4090 | Expression* s2a = Runtime::make_call(code, loc, 2, buf, this->expr_); | |
ea664253 | 4091 | return Expression::make_unsafe_cast(type, s2a, loc)->get_backend(context); |
2c809f8f | 4092 | } |
4093 | else if (type->is_numeric_type()) | |
4094 | { | |
4095 | go_assert(Type::are_convertible(type, expr_type, NULL)); | |
859cdc93 | 4096 | Bexpression* bexpr = this->expr_->get_backend(context); |
ea664253 | 4097 | return gogo->backend()->convert_expression(btype, bexpr, loc); |
e440a328 | 4098 | } |
4099 | else if ((type->is_unsafe_pointer_type() | |
2c809f8f | 4100 | && (expr_type->points_to() != NULL |
4101 | || expr_type->integer_type())) | |
4102 | || (expr_type->is_unsafe_pointer_type() | |
4103 | && type->points_to() != NULL) | |
4104 | || (this->may_convert_function_types_ | |
4105 | && type->function_type() != NULL | |
4106 | && expr_type->function_type() != NULL)) | |
859cdc93 | 4107 | { |
4108 | Bexpression* bexpr = this->expr_->get_backend(context); | |
4109 | return gogo->backend()->convert_expression(btype, bexpr, loc); | |
4110 | } | |
e440a328 | 4111 | else |
2c809f8f | 4112 | { |
4113 | Expression* conversion = | |
4114 | Expression::convert_for_assignment(gogo, type, this->expr_, loc); | |
ea664253 | 4115 | return conversion->get_backend(context); |
2c809f8f | 4116 | } |
e440a328 | 4117 | } |
4118 | ||
5f6f5357 | 4119 | // Cost of inlining a type conversion. |
4120 | ||
4121 | int | |
4122 | Type_conversion_expression::do_inlining_cost() const | |
4123 | { | |
4124 | Type* type = this->type_; | |
4125 | Type* expr_type = this->expr_->type(); | |
4126 | if (type->interface_type() != NULL || expr_type->interface_type() != NULL) | |
4127 | return 10; | |
4128 | else if (type->is_string_type() && expr_type->integer_type() != NULL) | |
4129 | return 10; | |
4130 | else if (type->is_string_type() && expr_type->is_slice_type()) | |
4131 | return 10; | |
4132 | else if (type->is_slice_type() && expr_type->is_string_type()) | |
4133 | return 10; | |
4134 | else | |
4135 | return 1; | |
4136 | } | |
4137 | ||
e440a328 | 4138 | // Output a type conversion in a constant expression. |
4139 | ||
4140 | void | |
548be246 | 4141 | Type_conversion_expression::do_export(Export_function_body* efb) const |
e440a328 | 4142 | { |
204d4af4 | 4143 | efb->write_c_string("$convert("); |
548be246 | 4144 | efb->write_type(this->type_); |
4145 | efb->write_c_string(", "); | |
69f634cc | 4146 | |
4147 | Type* old_context = efb->type_context(); | |
4148 | efb->set_type_context(this->type_); | |
4149 | ||
548be246 | 4150 | this->expr_->export_expression(efb); |
69f634cc | 4151 | |
4152 | efb->set_type_context(old_context); | |
4153 | ||
548be246 | 4154 | efb->write_c_string(")"); |
e440a328 | 4155 | } |
4156 | ||
4157 | // Import a type conversion or a struct construction. | |
4158 | ||
4159 | Expression* | |
bc8e2ef4 | 4160 | Type_conversion_expression::do_import(Import_expression* imp, Location loc) |
e440a328 | 4161 | { |
204d4af4 | 4162 | imp->require_c_string("$convert("); |
e440a328 | 4163 | Type* type = imp->read_type(); |
4164 | imp->require_c_string(", "); | |
9b92780c | 4165 | Expression* val = Expression::import_expression(imp, loc); |
e440a328 | 4166 | imp->require_c_string(")"); |
9b92780c | 4167 | return Expression::make_cast(type, val, loc); |
e440a328 | 4168 | } |
4169 | ||
d751bb78 | 4170 | // Dump ast representation for a type conversion expression. |
4171 | ||
4172 | void | |
4173 | Type_conversion_expression::do_dump_expression( | |
4174 | Ast_dump_context* ast_dump_context) const | |
4175 | { | |
4176 | ast_dump_context->dump_type(this->type_); | |
4177 | ast_dump_context->ostream() << "("; | |
4178 | ast_dump_context->dump_expression(this->expr_); | |
4179 | ast_dump_context->ostream() << ") "; | |
4180 | } | |
4181 | ||
e440a328 | 4182 | // Make a type cast expression. |
4183 | ||
4184 | Expression* | |
b13c66cd | 4185 | Expression::make_cast(Type* type, Expression* val, Location location) |
e440a328 | 4186 | { |
4187 | if (type->is_error_type() || val->is_error_expression()) | |
4188 | return Expression::make_error(location); | |
4189 | return new Type_conversion_expression(type, val, location); | |
4190 | } | |
4191 | ||
98f62f7a | 4192 | // Class Unsafe_type_conversion_expression. |
9581e91d | 4193 | |
4194 | // Traversal. | |
4195 | ||
4196 | int | |
4197 | Unsafe_type_conversion_expression::do_traverse(Traverse* traverse) | |
4198 | { | |
4199 | if (Expression::traverse(&this->expr_, traverse) == TRAVERSE_EXIT | |
4200 | || Type::traverse(this->type_, traverse) == TRAVERSE_EXIT) | |
4201 | return TRAVERSE_EXIT; | |
4202 | return TRAVERSE_CONTINUE; | |
4203 | } | |
4204 | ||
3ae06f68 | 4205 | // Return whether an unsafe type conversion can be used as a constant |
4206 | // initializer. | |
aa5ae575 | 4207 | |
4208 | bool | |
3ae06f68 | 4209 | Unsafe_type_conversion_expression::do_is_static_initializer() const |
aa5ae575 | 4210 | { |
4211 | Type* type = this->type_; | |
4212 | Type* expr_type = this->expr_->type(); | |
4213 | ||
4214 | if (type->interface_type() != NULL | |
4215 | || expr_type->interface_type() != NULL) | |
4216 | return false; | |
4217 | ||
3ae06f68 | 4218 | if (!this->expr_->is_static_initializer()) |
aa5ae575 | 4219 | return false; |
4220 | ||
4221 | if (Type::are_convertible(type, expr_type, NULL)) | |
4222 | return true; | |
4223 | ||
03118c21 | 4224 | if (type->is_string_type() && expr_type->is_string_type()) |
4225 | return true; | |
4226 | ||
4227 | if ((type->is_numeric_type() | |
4228 | || type->is_boolean_type() | |
4229 | || type->points_to() != NULL) | |
4230 | && (expr_type->is_numeric_type() | |
4231 | || expr_type->is_boolean_type() | |
4232 | || expr_type->points_to() != NULL)) | |
4233 | return true; | |
4234 | ||
4235 | return false; | |
aa5ae575 | 4236 | } |
4237 | ||
de590a61 | 4238 | // Copy. |
4239 | ||
4240 | Expression* | |
4241 | Unsafe_type_conversion_expression::do_copy() | |
4242 | { | |
4243 | return new Unsafe_type_conversion_expression(this->type_->copy_expressions(), | |
4244 | this->expr_->copy(), | |
4245 | this->location()); | |
4246 | } | |
4247 | ||
9581e91d | 4248 | // Convert to backend representation. |
4249 | ||
ea664253 | 4250 | Bexpression* |
4251 | Unsafe_type_conversion_expression::do_get_backend(Translate_context* context) | |
9581e91d | 4252 | { |
4253 | // We are only called for a limited number of cases. | |
4254 | ||
4255 | Type* t = this->type_; | |
4256 | Type* et = this->expr_->type(); | |
5c4802f1 | 4257 | |
4258 | if (t->is_error_type() | |
4259 | || this->expr_->is_error_expression() | |
4260 | || et->is_error_type()) | |
4261 | { | |
4262 | go_assert(saw_errors()); | |
4263 | return context->backend()->error_expression(); | |
4264 | } | |
4265 | ||
2c809f8f | 4266 | if (t->array_type() != NULL) |
4267 | go_assert(et->array_type() != NULL | |
4268 | && t->is_slice_type() == et->is_slice_type()); | |
4269 | else if (t->struct_type() != NULL) | |
9581e91d | 4270 | { |
2c809f8f | 4271 | if (t->named_type() != NULL |
4272 | && et->named_type() != NULL | |
4273 | && !Type::are_convertible(t, et, NULL)) | |
4274 | { | |
4275 | go_assert(saw_errors()); | |
ea664253 | 4276 | return context->backend()->error_expression(); |
2c809f8f | 4277 | } |
4278 | ||
4279 | go_assert(et->struct_type() != NULL | |
4280 | && Type::are_convertible(t, et, NULL)); | |
4281 | } | |
4282 | else if (t->map_type() != NULL) | |
5b665222 | 4283 | go_assert(et->map_type() != NULL || et->points_to() != NULL); |
9581e91d | 4284 | else if (t->channel_type() != NULL) |
5b665222 | 4285 | go_assert(et->channel_type() != NULL || et->points_to() != NULL); |
09ea332d | 4286 | else if (t->points_to() != NULL) |
2c809f8f | 4287 | go_assert(et->points_to() != NULL |
4288 | || et->channel_type() != NULL | |
4289 | || et->map_type() != NULL | |
4290 | || et->function_type() != NULL | |
132ed071 | 4291 | || et->integer_type() != NULL |
2c809f8f | 4292 | || et->is_nil_type()); |
5b665222 | 4293 | else if (t->function_type() != NULL) |
4294 | go_assert(et->points_to() != NULL); | |
9581e91d | 4295 | else if (et->is_unsafe_pointer_type()) |
81487fff | 4296 | go_assert(t->points_to() != NULL |
4297 | || (t->integer_type() != NULL | |
4298 | && t->integer_type() == Type::lookup_integer_type("uintptr")->real_type())); | |
2c809f8f | 4299 | else if (t->interface_type() != NULL) |
9581e91d | 4300 | { |
2c809f8f | 4301 | bool empty_iface = t->interface_type()->is_empty(); |
c484d925 | 4302 | go_assert(et->interface_type() != NULL |
2c809f8f | 4303 | && et->interface_type()->is_empty() == empty_iface); |
9581e91d | 4304 | } |
588e3cf9 | 4305 | else if (t->integer_type() != NULL) |
2c809f8f | 4306 | go_assert(et->is_boolean_type() |
4307 | || et->integer_type() != NULL | |
4308 | || et->function_type() != NULL | |
4309 | || et->points_to() != NULL | |
4310 | || et->map_type() != NULL | |
8ba8cc87 | 4311 | || et->channel_type() != NULL |
4312 | || et->is_nil_type()); | |
9581e91d | 4313 | else |
c3e6f413 | 4314 | go_unreachable(); |
9581e91d | 4315 | |
2c809f8f | 4316 | Gogo* gogo = context->gogo(); |
4317 | Btype* btype = t->get_backend(gogo); | |
ea664253 | 4318 | Bexpression* bexpr = this->expr_->get_backend(context); |
2c809f8f | 4319 | Location loc = this->location(); |
ea664253 | 4320 | return gogo->backend()->convert_expression(btype, bexpr, loc); |
9581e91d | 4321 | } |
4322 | ||
d751bb78 | 4323 | // Dump ast representation for an unsafe type conversion expression. |
4324 | ||
4325 | void | |
4326 | Unsafe_type_conversion_expression::do_dump_expression( | |
4327 | Ast_dump_context* ast_dump_context) const | |
4328 | { | |
4329 | ast_dump_context->dump_type(this->type_); | |
4330 | ast_dump_context->ostream() << "("; | |
4331 | ast_dump_context->dump_expression(this->expr_); | |
4332 | ast_dump_context->ostream() << ") "; | |
4333 | } | |
4334 | ||
9581e91d | 4335 | // Make an unsafe type conversion expression. |
4336 | ||
4337 | Expression* | |
4338 | Expression::make_unsafe_cast(Type* type, Expression* expr, | |
b13c66cd | 4339 | Location location) |
9581e91d | 4340 | { |
4341 | return new Unsafe_type_conversion_expression(type, expr, location); | |
4342 | } | |
4343 | ||
76f85fd6 | 4344 | // Class Unary_expression. |
e440a328 | 4345 | |
03118c21 | 4346 | // Call the address_taken method of the operand if needed. This is |
4347 | // called after escape analysis but before inserting write barriers. | |
4348 | ||
4349 | void | |
c1177ba4 | 4350 | Unary_expression::check_operand_address_taken(Gogo*) |
03118c21 | 4351 | { |
4352 | if (this->op_ != OPERATOR_AND) | |
4353 | return; | |
4354 | ||
4355 | // If this->escapes_ is false at this point, then it was set to | |
4356 | // false by an explicit call to set_does_not_escape, and the value | |
4357 | // does not escape. If this->escapes_ is true, we may be able to | |
2f86af0a | 4358 | // set it to false based on the escape analysis pass. |
4359 | if (this->escapes_) | |
4360 | { | |
4361 | Node* n = Node::make_node(this); | |
4362 | if ((n->encoding() & ESCAPE_MASK) == int(Node::ESCAPE_NONE)) | |
4363 | this->escapes_ = false; | |
03118c21 | 4364 | } |
4365 | ||
4366 | this->expr_->address_taken(this->escapes_); | |
4367 | } | |
4368 | ||
e440a328 | 4369 | // If we are taking the address of a composite literal, and the |
2c809f8f | 4370 | // contents are not constant, then we want to make a heap expression |
e440a328 | 4371 | // instead. |
4372 | ||
4373 | Expression* | |
ceeb4318 | 4374 | Unary_expression::do_lower(Gogo*, Named_object*, Statement_inserter*, int) |
e440a328 | 4375 | { |
b13c66cd | 4376 | Location loc = this->location(); |
e440a328 | 4377 | Operator op = this->op_; |
4378 | Expression* expr = this->expr_; | |
4379 | ||
4380 | if (op == OPERATOR_MULT && expr->is_type_expression()) | |
4381 | return Expression::make_type(Type::make_pointer_type(expr->type()), loc); | |
4382 | ||
4383 | // *&x simplifies to x. *(*T)(unsafe.Pointer)(&x) does not require | |
4384 | // moving x to the heap. FIXME: Is it worth doing a real escape | |
4385 | // analysis here? This case is found in math/unsafe.go and is | |
4386 | // therefore worth special casing. | |
4387 | if (op == OPERATOR_MULT) | |
4388 | { | |
4389 | Expression* e = expr; | |
4390 | while (e->classification() == EXPRESSION_CONVERSION) | |
4391 | { | |
4392 | Type_conversion_expression* te | |
4393 | = static_cast<Type_conversion_expression*>(e); | |
4394 | e = te->expr(); | |
4395 | } | |
4396 | ||
4397 | if (e->classification() == EXPRESSION_UNARY) | |
4398 | { | |
4399 | Unary_expression* ue = static_cast<Unary_expression*>(e); | |
4400 | if (ue->op_ == OPERATOR_AND) | |
4401 | { | |
4402 | if (e == expr) | |
4403 | { | |
4404 | // *&x == x. | |
f4dea966 | 4405 | if (!ue->expr_->is_addressable() && !ue->create_temp_) |
4406 | { | |
631d5788 | 4407 | go_error_at(ue->location(), |
4408 | "invalid operand for unary %<&%>"); | |
f4dea966 | 4409 | this->set_is_error(); |
4410 | } | |
e440a328 | 4411 | return ue->expr_; |
4412 | } | |
4413 | ue->set_does_not_escape(); | |
4414 | } | |
4415 | } | |
4416 | } | |
4417 | ||
55661ce9 | 4418 | // Catching an invalid indirection of unsafe.Pointer here avoid |
4419 | // having to deal with TYPE_VOID in other places. | |
4420 | if (op == OPERATOR_MULT && expr->type()->is_unsafe_pointer_type()) | |
4421 | { | |
631d5788 | 4422 | go_error_at(this->location(), "invalid indirect of %<unsafe.Pointer%>"); |
55661ce9 | 4423 | return Expression::make_error(this->location()); |
4424 | } | |
4425 | ||
d9f3743a | 4426 | // Check for an invalid pointer dereference. We need to do this |
4427 | // here because Unary_expression::do_type will return an error type | |
4428 | // in this case. That can cause code to appear erroneous, and | |
4429 | // therefore disappear at lowering time, without any error message. | |
4430 | if (op == OPERATOR_MULT && expr->type()->points_to() == NULL) | |
4431 | { | |
4432 | this->report_error(_("expected pointer")); | |
4433 | return Expression::make_error(this->location()); | |
4434 | } | |
4435 | ||
59a401fe | 4436 | if (op == OPERATOR_PLUS || op == OPERATOR_MINUS || op == OPERATOR_XOR) |
e440a328 | 4437 | { |
0c77715b | 4438 | Numeric_constant nc; |
4439 | if (expr->numeric_constant_value(&nc)) | |
e440a328 | 4440 | { |
0c77715b | 4441 | Numeric_constant result; |
af7a5274 | 4442 | bool issued_error; |
4443 | if (Unary_expression::eval_constant(op, &nc, loc, &result, | |
4444 | &issued_error)) | |
0c77715b | 4445 | return result.expression(loc); |
af7a5274 | 4446 | else if (issued_error) |
4447 | return Expression::make_error(this->location()); | |
e440a328 | 4448 | } |
4449 | } | |
4450 | ||
4451 | return this; | |
4452 | } | |
4453 | ||
f9ca30f9 | 4454 | // Flatten expression if a nil check must be performed and create temporary |
4455 | // variables if necessary. | |
4456 | ||
4457 | Expression* | |
4458 | Unary_expression::do_flatten(Gogo* gogo, Named_object*, | |
4459 | Statement_inserter* inserter) | |
4460 | { | |
5bf8be8b | 4461 | if (this->is_error_expression() |
4462 | || this->expr_->is_error_expression() | |
4463 | || this->expr_->type()->is_error_type()) | |
4464 | { | |
4465 | go_assert(saw_errors()); | |
4466 | return Expression::make_error(this->location()); | |
4467 | } | |
f4dea966 | 4468 | |
f9ca30f9 | 4469 | Location location = this->location(); |
4470 | if (this->op_ == OPERATOR_MULT | |
4471 | && !this->expr_->is_variable()) | |
4472 | { | |
4473 | go_assert(this->expr_->type()->points_to() != NULL); | |
f614ea8b | 4474 | switch (this->requires_nil_check(gogo)) |
f9ca30f9 | 4475 | { |
f614ea8b | 4476 | case NIL_CHECK_ERROR_ENCOUNTERED: |
2a305b85 | 4477 | { |
4478 | go_assert(saw_errors()); | |
4479 | return Expression::make_error(this->location()); | |
4480 | } | |
f614ea8b | 4481 | case NIL_CHECK_NOT_NEEDED: |
4482 | break; | |
4483 | case NIL_CHECK_NEEDED: | |
4484 | this->create_temp_ = true; | |
4485 | break; | |
4486 | case NIL_CHECK_DEFAULT: | |
4487 | go_unreachable(); | |
f9ca30f9 | 4488 | } |
4489 | } | |
4490 | ||
4491 | if (this->create_temp_ && !this->expr_->is_variable()) | |
4492 | { | |
4493 | Temporary_statement* temp = | |
4494 | Statement::make_temporary(NULL, this->expr_, location); | |
4495 | inserter->insert(temp); | |
4496 | this->expr_ = Expression::make_temporary_reference(temp, location); | |
4497 | } | |
4498 | ||
4499 | return this; | |
4500 | } | |
4501 | ||
e440a328 | 4502 | // Return whether a unary expression is a constant. |
4503 | ||
4504 | bool | |
4505 | Unary_expression::do_is_constant() const | |
4506 | { | |
4507 | if (this->op_ == OPERATOR_MULT) | |
4508 | { | |
4509 | // Indirecting through a pointer is only constant if the object | |
4510 | // to which the expression points is constant, but we currently | |
4511 | // have no way to determine that. | |
4512 | return false; | |
4513 | } | |
4514 | else if (this->op_ == OPERATOR_AND) | |
4515 | { | |
4516 | // Taking the address of a variable is constant if it is a | |
f9ca30f9 | 4517 | // global variable, not constant otherwise. In other cases taking the |
4518 | // address is probably not a constant. | |
e440a328 | 4519 | Var_expression* ve = this->expr_->var_expression(); |
4520 | if (ve != NULL) | |
4521 | { | |
4522 | Named_object* no = ve->named_object(); | |
4523 | return no->is_variable() && no->var_value()->is_global(); | |
4524 | } | |
4525 | return false; | |
4526 | } | |
4527 | else | |
4528 | return this->expr_->is_constant(); | |
4529 | } | |
4530 | ||
3ae06f68 | 4531 | // Return whether a unary expression can be used as a constant |
4532 | // initializer. | |
4533 | ||
4534 | bool | |
4535 | Unary_expression::do_is_static_initializer() const | |
4536 | { | |
4537 | if (this->op_ == OPERATOR_MULT) | |
4538 | return false; | |
4539 | else if (this->op_ == OPERATOR_AND) | |
de048538 | 4540 | return Unary_expression::base_is_static_initializer(this->expr_); |
4541 | else | |
4542 | return this->expr_->is_static_initializer(); | |
4543 | } | |
3ae06f68 | 4544 | |
de048538 | 4545 | // Return whether the address of EXPR can be used as a static |
4546 | // initializer. | |
3ae06f68 | 4547 | |
de048538 | 4548 | bool |
4549 | Unary_expression::base_is_static_initializer(Expression* expr) | |
4550 | { | |
4551 | // The address of a field reference can be a static initializer if | |
4552 | // the base can be a static initializer. | |
4553 | Field_reference_expression* fre = expr->field_reference_expression(); | |
4554 | if (fre != NULL) | |
4555 | return Unary_expression::base_is_static_initializer(fre->expr()); | |
4556 | ||
4557 | // The address of an index expression can be a static initializer if | |
4558 | // the base can be a static initializer and the index is constant. | |
4559 | Array_index_expression* aind = expr->array_index_expression(); | |
4560 | if (aind != NULL) | |
4561 | return (aind->end() == NULL | |
4562 | && aind->start()->is_constant() | |
4563 | && Unary_expression::base_is_static_initializer(aind->array())); | |
4564 | ||
4565 | // The address of a global variable can be a static initializer. | |
4566 | Var_expression* ve = expr->var_expression(); | |
4567 | if (ve != NULL) | |
4568 | { | |
4569 | Named_object* no = ve->named_object(); | |
4570 | return no->is_variable() && no->var_value()->is_global(); | |
4571 | } | |
4572 | ||
4573 | // The address of a composite literal can be used as a static | |
4574 | // initializer if the composite literal is itself usable as a | |
4575 | // static initializer. | |
4576 | if (expr->is_composite_literal() && expr->is_static_initializer()) | |
4577 | return true; | |
3ae06f68 | 4578 | |
de048538 | 4579 | // The address of a string constant can be used as a static |
4580 | // initializer. This can not be written in Go itself but this is | |
4581 | // used when building a type descriptor. | |
4582 | if (expr->string_expression() != NULL) | |
4583 | return true; | |
4584 | ||
4585 | return false; | |
3ae06f68 | 4586 | } |
4587 | ||
f614ea8b | 4588 | // Return whether this dereference expression requires an explicit nil |
4589 | // check. If we are dereferencing the pointer to a large struct | |
4590 | // (greater than the specified size threshold), we need to check for | |
4591 | // nil. We don't bother to check for small structs because we expect | |
4592 | // the system to crash on a nil pointer dereference. However, if we | |
4593 | // know the address of this expression is being taken, we must always | |
4594 | // check for nil. | |
4595 | Unary_expression::Nil_check_classification | |
f03a9fbf | 4596 | Unary_expression::requires_nil_check(Gogo* gogo) |
f614ea8b | 4597 | { |
4598 | go_assert(this->op_ == OPERATOR_MULT); | |
4599 | go_assert(this->expr_->type()->points_to() != NULL); | |
4600 | ||
4601 | if (this->issue_nil_check_ == NIL_CHECK_NEEDED) | |
4602 | return NIL_CHECK_NEEDED; | |
4603 | else if (this->issue_nil_check_ == NIL_CHECK_NOT_NEEDED) | |
4604 | return NIL_CHECK_NOT_NEEDED; | |
4605 | ||
4606 | Type* ptype = this->expr_->type()->points_to(); | |
4607 | int64_t type_size = -1; | |
4608 | if (!ptype->is_void_type()) | |
4609 | { | |
4610 | bool ok = ptype->backend_type_size(gogo, &type_size); | |
4611 | if (!ok) | |
4612 | return NIL_CHECK_ERROR_ENCOUNTERED; | |
4613 | } | |
4614 | ||
4615 | int64_t size_cutoff = gogo->nil_check_size_threshold(); | |
4616 | if (size_cutoff == -1 || (type_size != -1 && type_size >= size_cutoff)) | |
4617 | this->issue_nil_check_ = NIL_CHECK_NEEDED; | |
4618 | else | |
4619 | this->issue_nil_check_ = NIL_CHECK_NOT_NEEDED; | |
4620 | return this->issue_nil_check_; | |
4621 | } | |
4622 | ||
0c77715b | 4623 | // Apply unary opcode OP to UNC, setting NC. Return true if this |
af7a5274 | 4624 | // could be done, false if not. On overflow, issues an error and sets |
4625 | // *ISSUED_ERROR. | |
e440a328 | 4626 | |
4627 | bool | |
0c77715b | 4628 | Unary_expression::eval_constant(Operator op, const Numeric_constant* unc, |
af7a5274 | 4629 | Location location, Numeric_constant* nc, |
4630 | bool* issued_error) | |
e440a328 | 4631 | { |
af7a5274 | 4632 | *issued_error = false; |
e440a328 | 4633 | switch (op) |
4634 | { | |
4635 | case OPERATOR_PLUS: | |
0c77715b | 4636 | *nc = *unc; |
e440a328 | 4637 | return true; |
0c77715b | 4638 | |
e440a328 | 4639 | case OPERATOR_MINUS: |
0c77715b | 4640 | if (unc->is_int() || unc->is_rune()) |
4641 | break; | |
4642 | else if (unc->is_float()) | |
4643 | { | |
4644 | mpfr_t uval; | |
4645 | unc->get_float(&uval); | |
4646 | mpfr_t val; | |
4647 | mpfr_init(val); | |
4648 | mpfr_neg(val, uval, GMP_RNDN); | |
4649 | nc->set_float(unc->type(), val); | |
4650 | mpfr_clear(uval); | |
4651 | mpfr_clear(val); | |
4652 | return true; | |
4653 | } | |
4654 | else if (unc->is_complex()) | |
4655 | { | |
fcbea5e4 | 4656 | mpc_t uval; |
4657 | unc->get_complex(&uval); | |
4658 | mpc_t val; | |
4659 | mpc_init2(val, mpc_precision); | |
4660 | mpc_neg(val, uval, MPC_RNDNN); | |
4661 | nc->set_complex(unc->type(), val); | |
4662 | mpc_clear(uval); | |
4663 | mpc_clear(val); | |
0c77715b | 4664 | return true; |
4665 | } | |
e440a328 | 4666 | else |
0c77715b | 4667 | go_unreachable(); |
e440a328 | 4668 | |
0c77715b | 4669 | case OPERATOR_XOR: |
4670 | break; | |
68448d53 | 4671 | |
59a401fe | 4672 | case OPERATOR_NOT: |
e440a328 | 4673 | case OPERATOR_AND: |
4674 | case OPERATOR_MULT: | |
4675 | return false; | |
0c77715b | 4676 | |
e440a328 | 4677 | default: |
c3e6f413 | 4678 | go_unreachable(); |
e440a328 | 4679 | } |
e440a328 | 4680 | |
0c77715b | 4681 | if (!unc->is_int() && !unc->is_rune()) |
4682 | return false; | |
4683 | ||
4684 | mpz_t uval; | |
8387e1df | 4685 | if (unc->is_rune()) |
4686 | unc->get_rune(&uval); | |
4687 | else | |
4688 | unc->get_int(&uval); | |
0c77715b | 4689 | mpz_t val; |
4690 | mpz_init(val); | |
e440a328 | 4691 | |
e440a328 | 4692 | switch (op) |
4693 | { | |
e440a328 | 4694 | case OPERATOR_MINUS: |
0c77715b | 4695 | mpz_neg(val, uval); |
4696 | break; | |
4697 | ||
e440a328 | 4698 | case OPERATOR_NOT: |
0c77715b | 4699 | mpz_set_ui(val, mpz_cmp_si(uval, 0) == 0 ? 1 : 0); |
4700 | break; | |
4701 | ||
e440a328 | 4702 | case OPERATOR_XOR: |
0c77715b | 4703 | { |
4704 | Type* utype = unc->type(); | |
4705 | if (utype->integer_type() == NULL | |
4706 | || utype->integer_type()->is_abstract()) | |
4707 | mpz_com(val, uval); | |
4708 | else | |
4709 | { | |
4710 | // The number of HOST_WIDE_INTs that it takes to represent | |
4711 | // UVAL. | |
4712 | size_t count = ((mpz_sizeinbase(uval, 2) | |
4713 | + HOST_BITS_PER_WIDE_INT | |
4714 | - 1) | |
4715 | / HOST_BITS_PER_WIDE_INT); | |
e440a328 | 4716 | |
0c77715b | 4717 | unsigned HOST_WIDE_INT* phwi = new unsigned HOST_WIDE_INT[count]; |
4718 | memset(phwi, 0, count * sizeof(HOST_WIDE_INT)); | |
4719 | ||
4720 | size_t obits = utype->integer_type()->bits(); | |
4721 | ||
4722 | if (!utype->integer_type()->is_unsigned() && mpz_sgn(uval) < 0) | |
4723 | { | |
4724 | mpz_t adj; | |
4725 | mpz_init_set_ui(adj, 1); | |
4726 | mpz_mul_2exp(adj, adj, obits); | |
4727 | mpz_add(uval, uval, adj); | |
4728 | mpz_clear(adj); | |
4729 | } | |
4730 | ||
4731 | size_t ecount; | |
4732 | mpz_export(phwi, &ecount, -1, sizeof(HOST_WIDE_INT), 0, 0, uval); | |
4733 | go_assert(ecount <= count); | |
4734 | ||
4735 | // Trim down to the number of words required by the type. | |
4736 | size_t ocount = ((obits + HOST_BITS_PER_WIDE_INT - 1) | |
4737 | / HOST_BITS_PER_WIDE_INT); | |
4738 | go_assert(ocount <= count); | |
4739 | ||
4740 | for (size_t i = 0; i < ocount; ++i) | |
4741 | phwi[i] = ~phwi[i]; | |
4742 | ||
4743 | size_t clearbits = ocount * HOST_BITS_PER_WIDE_INT - obits; | |
4744 | if (clearbits != 0) | |
4745 | phwi[ocount - 1] &= (((unsigned HOST_WIDE_INT) (HOST_WIDE_INT) -1) | |
4746 | >> clearbits); | |
4747 | ||
4748 | mpz_import(val, ocount, -1, sizeof(HOST_WIDE_INT), 0, 0, phwi); | |
4749 | ||
4750 | if (!utype->integer_type()->is_unsigned() | |
4751 | && mpz_tstbit(val, obits - 1)) | |
4752 | { | |
4753 | mpz_t adj; | |
4754 | mpz_init_set_ui(adj, 1); | |
4755 | mpz_mul_2exp(adj, adj, obits); | |
4756 | mpz_sub(val, val, adj); | |
4757 | mpz_clear(adj); | |
4758 | } | |
4759 | ||
4760 | delete[] phwi; | |
4761 | } | |
4762 | } | |
4763 | break; | |
e440a328 | 4764 | |
e440a328 | 4765 | default: |
c3e6f413 | 4766 | go_unreachable(); |
e440a328 | 4767 | } |
e440a328 | 4768 | |
0c77715b | 4769 | if (unc->is_rune()) |
4770 | nc->set_rune(NULL, val); | |
e440a328 | 4771 | else |
0c77715b | 4772 | nc->set_int(NULL, val); |
e440a328 | 4773 | |
0c77715b | 4774 | mpz_clear(uval); |
4775 | mpz_clear(val); | |
e440a328 | 4776 | |
af7a5274 | 4777 | if (!nc->set_type(unc->type(), true, location)) |
4778 | { | |
4779 | *issued_error = true; | |
4780 | return false; | |
4781 | } | |
4782 | return true; | |
e440a328 | 4783 | } |
4784 | ||
0c77715b | 4785 | // Return the integral constant value of a unary expression, if it has one. |
e440a328 | 4786 | |
4787 | bool | |
0c77715b | 4788 | Unary_expression::do_numeric_constant_value(Numeric_constant* nc) const |
e440a328 | 4789 | { |
0c77715b | 4790 | Numeric_constant unc; |
4791 | if (!this->expr_->numeric_constant_value(&unc)) | |
4792 | return false; | |
af7a5274 | 4793 | bool issued_error; |
0c77715b | 4794 | return Unary_expression::eval_constant(this->op_, &unc, this->location(), |
af7a5274 | 4795 | nc, &issued_error); |
e440a328 | 4796 | } |
4797 | ||
ac7ef97d | 4798 | // Return the boolean constant value of a unary expression, if it has one. |
4799 | ||
4800 | bool | |
4801 | Unary_expression::do_boolean_constant_value(bool* val) const | |
4802 | { | |
4803 | if (this->op_ == OPERATOR_NOT | |
4804 | && this->expr_->boolean_constant_value(val)) | |
4805 | { | |
4806 | *val = !*val; | |
4807 | return true; | |
4808 | } | |
4809 | return false; | |
4810 | } | |
4811 | ||
e440a328 | 4812 | // Return the type of a unary expression. |
4813 | ||
4814 | Type* | |
4815 | Unary_expression::do_type() | |
4816 | { | |
4817 | switch (this->op_) | |
4818 | { | |
4819 | case OPERATOR_PLUS: | |
4820 | case OPERATOR_MINUS: | |
4821 | case OPERATOR_NOT: | |
4822 | case OPERATOR_XOR: | |
4823 | return this->expr_->type(); | |
4824 | ||
4825 | case OPERATOR_AND: | |
4826 | return Type::make_pointer_type(this->expr_->type()); | |
4827 | ||
4828 | case OPERATOR_MULT: | |
4829 | { | |
4830 | Type* subtype = this->expr_->type(); | |
4831 | Type* points_to = subtype->points_to(); | |
4832 | if (points_to == NULL) | |
4833 | return Type::make_error_type(); | |
4834 | return points_to; | |
4835 | } | |
4836 | ||
4837 | default: | |
c3e6f413 | 4838 | go_unreachable(); |
e440a328 | 4839 | } |
4840 | } | |
4841 | ||
4842 | // Determine abstract types for a unary expression. | |
4843 | ||
4844 | void | |
4845 | Unary_expression::do_determine_type(const Type_context* context) | |
4846 | { | |
4847 | switch (this->op_) | |
4848 | { | |
4849 | case OPERATOR_PLUS: | |
4850 | case OPERATOR_MINUS: | |
4851 | case OPERATOR_NOT: | |
4852 | case OPERATOR_XOR: | |
4853 | this->expr_->determine_type(context); | |
4854 | break; | |
4855 | ||
4856 | case OPERATOR_AND: | |
4857 | // Taking the address of something. | |
4858 | { | |
4859 | Type* subtype = (context->type == NULL | |
4860 | ? NULL | |
4861 | : context->type->points_to()); | |
4862 | Type_context subcontext(subtype, false); | |
4863 | this->expr_->determine_type(&subcontext); | |
4864 | } | |
4865 | break; | |
4866 | ||
4867 | case OPERATOR_MULT: | |
4868 | // Indirecting through a pointer. | |
4869 | { | |
4870 | Type* subtype = (context->type == NULL | |
4871 | ? NULL | |
4872 | : Type::make_pointer_type(context->type)); | |
4873 | Type_context subcontext(subtype, false); | |
4874 | this->expr_->determine_type(&subcontext); | |
4875 | } | |
4876 | break; | |
4877 | ||
4878 | default: | |
c3e6f413 | 4879 | go_unreachable(); |
e440a328 | 4880 | } |
4881 | } | |
4882 | ||
4883 | // Check types for a unary expression. | |
4884 | ||
4885 | void | |
4886 | Unary_expression::do_check_types(Gogo*) | |
4887 | { | |
9fe897ef | 4888 | Type* type = this->expr_->type(); |
5c13bd80 | 4889 | if (type->is_error()) |
9fe897ef | 4890 | { |
4891 | this->set_is_error(); | |
4892 | return; | |
4893 | } | |
4894 | ||
e440a328 | 4895 | switch (this->op_) |
4896 | { | |
4897 | case OPERATOR_PLUS: | |
4898 | case OPERATOR_MINUS: | |
9fe897ef | 4899 | if (type->integer_type() == NULL |
4900 | && type->float_type() == NULL | |
4901 | && type->complex_type() == NULL) | |
4902 | this->report_error(_("expected numeric type")); | |
e440a328 | 4903 | break; |
4904 | ||
4905 | case OPERATOR_NOT: | |
59a401fe | 4906 | if (!type->is_boolean_type()) |
4907 | this->report_error(_("expected boolean type")); | |
4908 | break; | |
4909 | ||
e440a328 | 4910 | case OPERATOR_XOR: |
b3b1474e | 4911 | if (type->integer_type() == NULL) |
4912 | this->report_error(_("expected integer")); | |
e440a328 | 4913 | break; |
4914 | ||
4915 | case OPERATOR_AND: | |
4916 | if (!this->expr_->is_addressable()) | |
09ea332d | 4917 | { |
4918 | if (!this->create_temp_) | |
f4dea966 | 4919 | { |
631d5788 | 4920 | go_error_at(this->location(), "invalid operand for unary %<&%>"); |
f4dea966 | 4921 | this->set_is_error(); |
4922 | } | |
09ea332d | 4923 | } |
e440a328 | 4924 | else |
da244e59 | 4925 | this->expr_->issue_nil_check(); |
e440a328 | 4926 | break; |
4927 | ||
4928 | case OPERATOR_MULT: | |
4929 | // Indirecting through a pointer. | |
9fe897ef | 4930 | if (type->points_to() == NULL) |
4931 | this->report_error(_("expected pointer")); | |
7661d702 | 4932 | if (type->points_to()->is_error()) |
4933 | this->set_is_error(); | |
e440a328 | 4934 | break; |
4935 | ||
4936 | default: | |
c3e6f413 | 4937 | go_unreachable(); |
e440a328 | 4938 | } |
4939 | } | |
4940 | ||
ea664253 | 4941 | // Get the backend representation for a unary expression. |
e440a328 | 4942 | |
ea664253 | 4943 | Bexpression* |
4944 | Unary_expression::do_get_backend(Translate_context* context) | |
e440a328 | 4945 | { |
1b1f2abf | 4946 | Gogo* gogo = context->gogo(); |
e9d3367e | 4947 | Location loc = this->location(); |
4948 | ||
4949 | // Taking the address of a set-and-use-temporary expression requires | |
4950 | // setting the temporary and then taking the address. | |
4951 | if (this->op_ == OPERATOR_AND) | |
4952 | { | |
4953 | Set_and_use_temporary_expression* sut = | |
4954 | this->expr_->set_and_use_temporary_expression(); | |
4955 | if (sut != NULL) | |
4956 | { | |
4957 | Temporary_statement* temp = sut->temporary(); | |
4958 | Bvariable* bvar = temp->get_backend_variable(context); | |
d4e6573e | 4959 | Bexpression* bvar_expr = |
7af8e400 | 4960 | gogo->backend()->var_expression(bvar, loc); |
ea664253 | 4961 | Bexpression* bval = sut->expression()->get_backend(context); |
f9ca30f9 | 4962 | |
0ab48656 | 4963 | Named_object* fn = context->function(); |
4964 | go_assert(fn != NULL); | |
4965 | Bfunction* bfn = | |
4966 | fn->func_value()->get_or_make_decl(gogo, fn); | |
f9ca30f9 | 4967 | Bstatement* bassign = |
0ab48656 | 4968 | gogo->backend()->assignment_statement(bfn, bvar_expr, bval, loc); |
f9ca30f9 | 4969 | Bexpression* bvar_addr = |
4970 | gogo->backend()->address_expression(bvar_expr, loc); | |
ea664253 | 4971 | return gogo->backend()->compound_expression(bassign, bvar_addr, loc); |
e9d3367e | 4972 | } |
4973 | } | |
4974 | ||
f9ca30f9 | 4975 | Bexpression* ret; |
ea664253 | 4976 | Bexpression* bexpr = this->expr_->get_backend(context); |
f9ca30f9 | 4977 | Btype* btype = this->expr_->type()->get_backend(gogo); |
e440a328 | 4978 | switch (this->op_) |
4979 | { | |
4980 | case OPERATOR_PLUS: | |
f9ca30f9 | 4981 | ret = bexpr; |
4982 | break; | |
e440a328 | 4983 | |
4984 | case OPERATOR_MINUS: | |
f9ca30f9 | 4985 | ret = gogo->backend()->unary_expression(this->op_, bexpr, loc); |
4986 | ret = gogo->backend()->convert_expression(btype, ret, loc); | |
4987 | break; | |
e440a328 | 4988 | |
4989 | case OPERATOR_NOT: | |
e440a328 | 4990 | case OPERATOR_XOR: |
f9ca30f9 | 4991 | ret = gogo->backend()->unary_expression(this->op_, bexpr, loc); |
4992 | break; | |
e440a328 | 4993 | |
4994 | case OPERATOR_AND: | |
09ea332d | 4995 | if (!this->create_temp_) |
4996 | { | |
4997 | // We should not see a non-constant constructor here; cases | |
4998 | // where we would see one should have been moved onto the | |
4999 | // heap at parse time. Taking the address of a nonconstant | |
5000 | // constructor will not do what the programmer expects. | |
f9ca30f9 | 5001 | |
5002 | go_assert(!this->expr_->is_composite_literal() | |
3ae06f68 | 5003 | || this->expr_->is_static_initializer()); |
24060bf9 | 5004 | if (this->expr_->classification() == EXPRESSION_UNARY) |
5005 | { | |
5006 | Unary_expression* ue = | |
5007 | static_cast<Unary_expression*>(this->expr_); | |
5008 | go_assert(ue->op() != OPERATOR_AND); | |
5009 | } | |
09ea332d | 5010 | } |
e440a328 | 5011 | |
f23d7786 | 5012 | if (this->is_gc_root_ || this->is_slice_init_) |
76f85fd6 | 5013 | { |
19272321 | 5014 | std::string var_name; |
f23d7786 | 5015 | bool copy_to_heap = false; |
5016 | if (this->is_gc_root_) | |
5017 | { | |
5018 | // Build a decl for a GC root variable. GC roots are mutable, so | |
5019 | // they cannot be represented as an immutable_struct in the | |
5020 | // backend. | |
19272321 | 5021 | var_name = gogo->gc_root_name(); |
f23d7786 | 5022 | } |
5023 | else | |
5024 | { | |
5025 | // Build a decl for a slice value initializer. An immutable slice | |
5026 | // value initializer may have to be copied to the heap if it | |
5027 | // contains pointers in a non-constant context. | |
19272321 | 5028 | var_name = gogo->initializer_name(); |
f23d7786 | 5029 | |
5030 | Array_type* at = this->expr_->type()->array_type(); | |
5031 | go_assert(at != NULL); | |
5032 | ||
5033 | // If we are not copying the value to the heap, we will only | |
5034 | // initialize the value once, so we can use this directly | |
5035 | // rather than copying it. In that case we can't make it | |
5036 | // read-only, because the program is permitted to change it. | |
ee200713 | 5037 | copy_to_heap = (context->function() != NULL |
5038 | || context->is_const()); | |
f23d7786 | 5039 | } |
19272321 | 5040 | std::string asm_name(go_selectively_encode_id(var_name)); |
f23d7786 | 5041 | Bvariable* implicit = |
19272321 | 5042 | gogo->backend()->implicit_variable(var_name, asm_name, |
438b4bec | 5043 | btype, true, copy_to_heap, |
5044 | false, 0); | |
19272321 | 5045 | gogo->backend()->implicit_variable_set_init(implicit, var_name, btype, |
aa5ae575 | 5046 | true, copy_to_heap, false, |
5047 | bexpr); | |
7af8e400 | 5048 | bexpr = gogo->backend()->var_expression(implicit, loc); |
1b4fb1e0 | 5049 | |
5050 | // If we are not copying a slice initializer to the heap, | |
5051 | // then it can be changed by the program, so if it can | |
5052 | // contain pointers we must register it as a GC root. | |
5053 | if (this->is_slice_init_ | |
5054 | && !copy_to_heap | |
5055 | && this->expr_->type()->has_pointer()) | |
5056 | { | |
5057 | Bexpression* root = | |
7af8e400 | 5058 | gogo->backend()->var_expression(implicit, loc); |
1b4fb1e0 | 5059 | root = gogo->backend()->address_expression(root, loc); |
5060 | Type* type = Type::make_pointer_type(this->expr_->type()); | |
5061 | gogo->add_gc_root(Expression::make_backend(root, type, loc)); | |
5062 | } | |
76f85fd6 | 5063 | } |
5064 | else if ((this->expr_->is_composite_literal() | |
3ae06f68 | 5065 | || this->expr_->string_expression() != NULL) |
5066 | && this->expr_->is_static_initializer()) | |
f9ca30f9 | 5067 | { |
19272321 | 5068 | std::string var_name(gogo->initializer_name()); |
5069 | std::string asm_name(go_selectively_encode_id(var_name)); | |
f9ca30f9 | 5070 | Bvariable* decl = |
19272321 | 5071 | gogo->backend()->immutable_struct(var_name, asm_name, |
438b4bec | 5072 | true, false, btype, loc); |
19272321 | 5073 | gogo->backend()->immutable_struct_set_init(decl, var_name, true, |
5074 | false, btype, loc, bexpr); | |
7af8e400 | 5075 | bexpr = gogo->backend()->var_expression(decl, loc); |
f9ca30f9 | 5076 | } |
e47edcf7 | 5077 | else if (this->expr_->is_constant()) |
5078 | { | |
5079 | std::string var_name(gogo->initializer_name()); | |
5080 | std::string asm_name(go_selectively_encode_id(var_name)); | |
5081 | Bvariable* decl = | |
5082 | gogo->backend()->implicit_variable(var_name, asm_name, btype, | |
5083 | true, true, false, 0); | |
5084 | gogo->backend()->implicit_variable_set_init(decl, var_name, btype, | |
5085 | true, true, false, | |
5086 | bexpr); | |
5087 | bexpr = gogo->backend()->var_expression(decl, loc); | |
5088 | } | |
09ea332d | 5089 | |
f9ca30f9 | 5090 | go_assert(!this->create_temp_ || this->expr_->is_variable()); |
5091 | ret = gogo->backend()->address_expression(bexpr, loc); | |
5092 | break; | |
e440a328 | 5093 | |
5094 | case OPERATOR_MULT: | |
5095 | { | |
f9ca30f9 | 5096 | go_assert(this->expr_->type()->points_to() != NULL); |
e440a328 | 5097 | |
f614ea8b | 5098 | bool known_valid = false; |
f9ca30f9 | 5099 | Type* ptype = this->expr_->type()->points_to(); |
5100 | Btype* pbtype = ptype->get_backend(gogo); | |
f614ea8b | 5101 | switch (this->requires_nil_check(gogo)) |
5102 | { | |
5103 | case NIL_CHECK_NOT_NEEDED: | |
5104 | break; | |
5105 | case NIL_CHECK_ERROR_ENCOUNTERED: | |
2a305b85 | 5106 | { |
5107 | go_assert(saw_errors()); | |
5108 | return gogo->backend()->error_expression(); | |
5109 | } | |
f614ea8b | 5110 | case NIL_CHECK_NEEDED: |
5111 | { | |
f9ca30f9 | 5112 | go_assert(this->expr_->is_variable()); |
2dd89704 | 5113 | |
5114 | // If we're nil-checking the result of a set-and-use-temporary | |
5115 | // expression, then pick out the target temp and use that | |
5116 | // for the final result of the conditional. | |
5117 | Bexpression* tbexpr = bexpr; | |
5118 | Bexpression* ubexpr = bexpr; | |
5119 | Set_and_use_temporary_expression* sut = | |
5120 | this->expr_->set_and_use_temporary_expression(); | |
5121 | if (sut != NULL) { | |
5122 | Temporary_statement* temp = sut->temporary(); | |
5123 | Bvariable* bvar = temp->get_backend_variable(context); | |
5124 | ubexpr = gogo->backend()->var_expression(bvar, loc); | |
5125 | } | |
ea664253 | 5126 | Bexpression* nil = |
f614ea8b | 5127 | Expression::make_nil(loc)->get_backend(context); |
f9ca30f9 | 5128 | Bexpression* compare = |
2dd89704 | 5129 | gogo->backend()->binary_expression(OPERATOR_EQEQ, tbexpr, |
f9ca30f9 | 5130 | nil, loc); |
f9ca30f9 | 5131 | Bexpression* crash = |
f614ea8b | 5132 | gogo->runtime_error(RUNTIME_ERROR_NIL_DEREFERENCE, |
5133 | loc)->get_backend(context); | |
93715b75 | 5134 | Bfunction* bfn = context->function()->func_value()->get_decl(); |
5135 | bexpr = gogo->backend()->conditional_expression(bfn, btype, | |
5136 | compare, | |
2dd89704 | 5137 | crash, ubexpr, |
f9ca30f9 | 5138 | loc); |
f614ea8b | 5139 | known_valid = true; |
5140 | break; | |
5141 | } | |
5142 | case NIL_CHECK_DEFAULT: | |
5143 | go_unreachable(); | |
5144 | } | |
5145 | ret = gogo->backend()->indirect_expression(pbtype, bexpr, | |
5146 | known_valid, loc); | |
e440a328 | 5147 | } |
f9ca30f9 | 5148 | break; |
e440a328 | 5149 | |
5150 | default: | |
c3e6f413 | 5151 | go_unreachable(); |
e440a328 | 5152 | } |
f9ca30f9 | 5153 | |
ea664253 | 5154 | return ret; |
e440a328 | 5155 | } |
5156 | ||
5157 | // Export a unary expression. | |
5158 | ||
5159 | void | |
548be246 | 5160 | Unary_expression::do_export(Export_function_body* efb) const |
e440a328 | 5161 | { |
5162 | switch (this->op_) | |
5163 | { | |
5164 | case OPERATOR_PLUS: | |
204d4af4 | 5165 | efb->write_c_string("+"); |
e440a328 | 5166 | break; |
5167 | case OPERATOR_MINUS: | |
204d4af4 | 5168 | efb->write_c_string("-"); |
e440a328 | 5169 | break; |
5170 | case OPERATOR_NOT: | |
204d4af4 | 5171 | efb->write_c_string("!"); |
e440a328 | 5172 | break; |
5173 | case OPERATOR_XOR: | |
204d4af4 | 5174 | efb->write_c_string("^"); |
e440a328 | 5175 | break; |
5176 | case OPERATOR_AND: | |
5f6f5357 | 5177 | efb->write_c_string("&"); |
5178 | break; | |
e440a328 | 5179 | case OPERATOR_MULT: |
5f6f5357 | 5180 | efb->write_c_string("*"); |
5181 | break; | |
e440a328 | 5182 | default: |
c3e6f413 | 5183 | go_unreachable(); |
e440a328 | 5184 | } |
548be246 | 5185 | this->expr_->export_expression(efb); |
e440a328 | 5186 | } |
5187 | ||
5188 | // Import a unary expression. | |
5189 | ||
5190 | Expression* | |
bc8e2ef4 | 5191 | Unary_expression::do_import(Import_expression* imp, Location loc) |
e440a328 | 5192 | { |
5193 | Operator op; | |
5194 | switch (imp->get_char()) | |
5195 | { | |
5196 | case '+': | |
5197 | op = OPERATOR_PLUS; | |
5198 | break; | |
5199 | case '-': | |
5200 | op = OPERATOR_MINUS; | |
5201 | break; | |
5202 | case '!': | |
5203 | op = OPERATOR_NOT; | |
5204 | break; | |
5205 | case '^': | |
5206 | op = OPERATOR_XOR; | |
5207 | break; | |
5f6f5357 | 5208 | case '&': |
5209 | op = OPERATOR_AND; | |
5210 | break; | |
5211 | case '*': | |
5212 | op = OPERATOR_MULT; | |
5213 | break; | |
e440a328 | 5214 | default: |
c3e6f413 | 5215 | go_unreachable(); |
e440a328 | 5216 | } |
204d4af4 | 5217 | if (imp->version() < EXPORT_FORMAT_V3) |
5218 | imp->require_c_string(" "); | |
9b92780c | 5219 | Expression* expr = Expression::import_expression(imp, loc); |
5220 | return Expression::make_unary(op, expr, loc); | |
e440a328 | 5221 | } |
5222 | ||
d751bb78 | 5223 | // Dump ast representation of an unary expression. |
5224 | ||
5225 | void | |
5226 | Unary_expression::do_dump_expression(Ast_dump_context* ast_dump_context) const | |
5227 | { | |
5228 | ast_dump_context->dump_operator(this->op_); | |
5229 | ast_dump_context->ostream() << "("; | |
5230 | ast_dump_context->dump_expression(this->expr_); | |
5231 | ast_dump_context->ostream() << ") "; | |
5232 | } | |
5233 | ||
e440a328 | 5234 | // Make a unary expression. |
5235 | ||
5236 | Expression* | |
b13c66cd | 5237 | Expression::make_unary(Operator op, Expression* expr, Location location) |
e440a328 | 5238 | { |
5239 | return new Unary_expression(op, expr, location); | |
5240 | } | |
5241 | ||
f614ea8b | 5242 | Expression* |
5243 | Expression::make_dereference(Expression* ptr, | |
5244 | Nil_check_classification docheck, | |
5245 | Location location) | |
5246 | { | |
5247 | Expression* deref = Expression::make_unary(OPERATOR_MULT, ptr, location); | |
5248 | if (docheck == NIL_CHECK_NEEDED) | |
5249 | deref->unary_expression()->set_requires_nil_check(true); | |
5250 | else if (docheck == NIL_CHECK_NOT_NEEDED) | |
5251 | deref->unary_expression()->set_requires_nil_check(false); | |
5252 | return deref; | |
5253 | } | |
5254 | ||
e440a328 | 5255 | // If this is an indirection through a pointer, return the expression |
5256 | // being pointed through. Otherwise return this. | |
5257 | ||
5258 | Expression* | |
5259 | Expression::deref() | |
5260 | { | |
5261 | if (this->classification_ == EXPRESSION_UNARY) | |
5262 | { | |
5263 | Unary_expression* ue = static_cast<Unary_expression*>(this); | |
5264 | if (ue->op() == OPERATOR_MULT) | |
5265 | return ue->operand(); | |
5266 | } | |
5267 | return this; | |
5268 | } | |
5269 | ||
5270 | // Class Binary_expression. | |
5271 | ||
5272 | // Traversal. | |
5273 | ||
5274 | int | |
5275 | Binary_expression::do_traverse(Traverse* traverse) | |
5276 | { | |
5277 | int t = Expression::traverse(&this->left_, traverse); | |
5278 | if (t == TRAVERSE_EXIT) | |
5279 | return TRAVERSE_EXIT; | |
5280 | return Expression::traverse(&this->right_, traverse); | |
5281 | } | |
5282 | ||
3ae06f68 | 5283 | // Return whether this expression may be used as a static initializer. |
5284 | ||
5285 | bool | |
5286 | Binary_expression::do_is_static_initializer() const | |
5287 | { | |
5288 | if (!this->left_->is_static_initializer() | |
5289 | || !this->right_->is_static_initializer()) | |
5290 | return false; | |
5291 | ||
5292 | // Addresses can be static initializers, but we can't implement | |
5293 | // arbitray binary expressions of them. | |
5294 | Unary_expression* lu = this->left_->unary_expression(); | |
5295 | Unary_expression* ru = this->right_->unary_expression(); | |
5296 | if (lu != NULL && lu->op() == OPERATOR_AND) | |
5297 | { | |
5298 | if (ru != NULL && ru->op() == OPERATOR_AND) | |
5299 | return this->op_ == OPERATOR_MINUS; | |
5300 | else | |
5301 | return this->op_ == OPERATOR_PLUS || this->op_ == OPERATOR_MINUS; | |
5302 | } | |
5303 | else if (ru != NULL && ru->op() == OPERATOR_AND) | |
5304 | return this->op_ == OPERATOR_PLUS || this->op_ == OPERATOR_MINUS; | |
5305 | ||
5306 | // Other cases should resolve in the backend. | |
5307 | return true; | |
5308 | } | |
5309 | ||
0c77715b | 5310 | // Return the type to use for a binary operation on operands of |
5311 | // LEFT_TYPE and RIGHT_TYPE. These are the types of constants and as | |
5312 | // such may be NULL or abstract. | |
5313 | ||
5314 | bool | |
5315 | Binary_expression::operation_type(Operator op, Type* left_type, | |
5316 | Type* right_type, Type** result_type) | |
5317 | { | |
5318 | if (left_type != right_type | |
5319 | && !left_type->is_abstract() | |
5320 | && !right_type->is_abstract() | |
5321 | && left_type->base() != right_type->base() | |
5322 | && op != OPERATOR_LSHIFT | |
5323 | && op != OPERATOR_RSHIFT) | |
5324 | { | |
5325 | // May be a type error--let it be diagnosed elsewhere. | |
5326 | return false; | |
5327 | } | |
5328 | ||
5329 | if (op == OPERATOR_LSHIFT || op == OPERATOR_RSHIFT) | |
5330 | { | |
5331 | if (left_type->integer_type() != NULL) | |
5332 | *result_type = left_type; | |
5333 | else | |
5334 | *result_type = Type::make_abstract_integer_type(); | |
5335 | } | |
5336 | else if (!left_type->is_abstract() && left_type->named_type() != NULL) | |
5337 | *result_type = left_type; | |
5338 | else if (!right_type->is_abstract() && right_type->named_type() != NULL) | |
5339 | *result_type = right_type; | |
5340 | else if (!left_type->is_abstract()) | |
5341 | *result_type = left_type; | |
5342 | else if (!right_type->is_abstract()) | |
5343 | *result_type = right_type; | |
5344 | else if (left_type->complex_type() != NULL) | |
5345 | *result_type = left_type; | |
5346 | else if (right_type->complex_type() != NULL) | |
5347 | *result_type = right_type; | |
5348 | else if (left_type->float_type() != NULL) | |
5349 | *result_type = left_type; | |
5350 | else if (right_type->float_type() != NULL) | |
5351 | *result_type = right_type; | |
5352 | else if (left_type->integer_type() != NULL | |
5353 | && left_type->integer_type()->is_rune()) | |
5354 | *result_type = left_type; | |
5355 | else if (right_type->integer_type() != NULL | |
5356 | && right_type->integer_type()->is_rune()) | |
5357 | *result_type = right_type; | |
5358 | else | |
5359 | *result_type = left_type; | |
5360 | ||
5361 | return true; | |
5362 | } | |
5363 | ||
5364 | // Convert an integer comparison code and an operator to a boolean | |
5365 | // value. | |
e440a328 | 5366 | |
5367 | bool | |
0c77715b | 5368 | Binary_expression::cmp_to_bool(Operator op, int cmp) |
e440a328 | 5369 | { |
e440a328 | 5370 | switch (op) |
5371 | { | |
5372 | case OPERATOR_EQEQ: | |
0c77715b | 5373 | return cmp == 0; |
5374 | break; | |
e440a328 | 5375 | case OPERATOR_NOTEQ: |
0c77715b | 5376 | return cmp != 0; |
5377 | break; | |
e440a328 | 5378 | case OPERATOR_LT: |
0c77715b | 5379 | return cmp < 0; |
5380 | break; | |
e440a328 | 5381 | case OPERATOR_LE: |
0c77715b | 5382 | return cmp <= 0; |
e440a328 | 5383 | case OPERATOR_GT: |
0c77715b | 5384 | return cmp > 0; |
e440a328 | 5385 | case OPERATOR_GE: |
0c77715b | 5386 | return cmp >= 0; |
e440a328 | 5387 | default: |
c3e6f413 | 5388 | go_unreachable(); |
e440a328 | 5389 | } |
5390 | } | |
5391 | ||
0c77715b | 5392 | // Compare constants according to OP. |
e440a328 | 5393 | |
5394 | bool | |
0c77715b | 5395 | Binary_expression::compare_constant(Operator op, Numeric_constant* left_nc, |
5396 | Numeric_constant* right_nc, | |
5397 | Location location, bool* result) | |
e440a328 | 5398 | { |
0c77715b | 5399 | Type* left_type = left_nc->type(); |
5400 | Type* right_type = right_nc->type(); | |
5401 | ||
5402 | Type* type; | |
5403 | if (!Binary_expression::operation_type(op, left_type, right_type, &type)) | |
5404 | return false; | |
5405 | ||
5406 | // When comparing an untyped operand to a typed operand, we are | |
5407 | // effectively coercing the untyped operand to the other operand's | |
5408 | // type, so make sure that is valid. | |
5409 | if (!left_nc->set_type(type, true, location) | |
5410 | || !right_nc->set_type(type, true, location)) | |
5411 | return false; | |
5412 | ||
5413 | bool ret; | |
5414 | int cmp; | |
5415 | if (type->complex_type() != NULL) | |
5416 | { | |
5417 | if (op != OPERATOR_EQEQ && op != OPERATOR_NOTEQ) | |
5418 | return false; | |
5419 | ret = Binary_expression::compare_complex(left_nc, right_nc, &cmp); | |
5420 | } | |
5421 | else if (type->float_type() != NULL) | |
5422 | ret = Binary_expression::compare_float(left_nc, right_nc, &cmp); | |
e440a328 | 5423 | else |
0c77715b | 5424 | ret = Binary_expression::compare_integer(left_nc, right_nc, &cmp); |
5425 | ||
5426 | if (ret) | |
5427 | *result = Binary_expression::cmp_to_bool(op, cmp); | |
5428 | ||
5429 | return ret; | |
5430 | } | |
5431 | ||
5432 | // Compare integer constants. | |
5433 | ||
5434 | bool | |
5435 | Binary_expression::compare_integer(const Numeric_constant* left_nc, | |
5436 | const Numeric_constant* right_nc, | |
5437 | int* cmp) | |
5438 | { | |
5439 | mpz_t left_val; | |
5440 | if (!left_nc->to_int(&left_val)) | |
5441 | return false; | |
5442 | mpz_t right_val; | |
5443 | if (!right_nc->to_int(&right_val)) | |
e440a328 | 5444 | { |
0c77715b | 5445 | mpz_clear(left_val); |
5446 | return false; | |
e440a328 | 5447 | } |
0c77715b | 5448 | |
5449 | *cmp = mpz_cmp(left_val, right_val); | |
5450 | ||
5451 | mpz_clear(left_val); | |
5452 | mpz_clear(right_val); | |
5453 | ||
5454 | return true; | |
5455 | } | |
5456 | ||
5457 | // Compare floating point constants. | |
5458 | ||
5459 | bool | |
5460 | Binary_expression::compare_float(const Numeric_constant* left_nc, | |
5461 | const Numeric_constant* right_nc, | |
5462 | int* cmp) | |
5463 | { | |
5464 | mpfr_t left_val; | |
5465 | if (!left_nc->to_float(&left_val)) | |
5466 | return false; | |
5467 | mpfr_t right_val; | |
5468 | if (!right_nc->to_float(&right_val)) | |
e440a328 | 5469 | { |
0c77715b | 5470 | mpfr_clear(left_val); |
5471 | return false; | |
5472 | } | |
5473 | ||
5474 | // We already coerced both operands to the same type. If that type | |
5475 | // is not an abstract type, we need to round the values accordingly. | |
5476 | Type* type = left_nc->type(); | |
5477 | if (!type->is_abstract() && type->float_type() != NULL) | |
5478 | { | |
5479 | int bits = type->float_type()->bits(); | |
5480 | mpfr_prec_round(left_val, bits, GMP_RNDN); | |
5481 | mpfr_prec_round(right_val, bits, GMP_RNDN); | |
e440a328 | 5482 | } |
0c77715b | 5483 | |
5484 | *cmp = mpfr_cmp(left_val, right_val); | |
5485 | ||
5486 | mpfr_clear(left_val); | |
5487 | mpfr_clear(right_val); | |
5488 | ||
5489 | return true; | |
e440a328 | 5490 | } |
5491 | ||
0c77715b | 5492 | // Compare complex constants. Complex numbers may only be compared |
5493 | // for equality. | |
e440a328 | 5494 | |
5495 | bool | |
0c77715b | 5496 | Binary_expression::compare_complex(const Numeric_constant* left_nc, |
5497 | const Numeric_constant* right_nc, | |
5498 | int* cmp) | |
e440a328 | 5499 | { |
fcbea5e4 | 5500 | mpc_t left_val; |
5501 | if (!left_nc->to_complex(&left_val)) | |
0c77715b | 5502 | return false; |
fcbea5e4 | 5503 | mpc_t right_val; |
5504 | if (!right_nc->to_complex(&right_val)) | |
e440a328 | 5505 | { |
fcbea5e4 | 5506 | mpc_clear(left_val); |
0c77715b | 5507 | return false; |
e440a328 | 5508 | } |
0c77715b | 5509 | |
5510 | // We already coerced both operands to the same type. If that type | |
5511 | // is not an abstract type, we need to round the values accordingly. | |
5512 | Type* type = left_nc->type(); | |
5513 | if (!type->is_abstract() && type->complex_type() != NULL) | |
e440a328 | 5514 | { |
0c77715b | 5515 | int bits = type->complex_type()->bits(); |
fcbea5e4 | 5516 | mpfr_prec_round(mpc_realref(left_val), bits / 2, GMP_RNDN); |
5517 | mpfr_prec_round(mpc_imagref(left_val), bits / 2, GMP_RNDN); | |
5518 | mpfr_prec_round(mpc_realref(right_val), bits / 2, GMP_RNDN); | |
5519 | mpfr_prec_round(mpc_imagref(right_val), bits / 2, GMP_RNDN); | |
e440a328 | 5520 | } |
0c77715b | 5521 | |
fcbea5e4 | 5522 | *cmp = mpc_cmp(left_val, right_val) != 0; |
0c77715b | 5523 | |
fcbea5e4 | 5524 | mpc_clear(left_val); |
5525 | mpc_clear(right_val); | |
0c77715b | 5526 | |
5527 | return true; | |
e440a328 | 5528 | } |
5529 | ||
0c77715b | 5530 | // Apply binary opcode OP to LEFT_NC and RIGHT_NC, setting NC. Return |
5531 | // true if this could be done, false if not. Issue errors at LOCATION | |
af7a5274 | 5532 | // as appropriate, and sets *ISSUED_ERROR if it did. |
e440a328 | 5533 | |
5534 | bool | |
0c77715b | 5535 | Binary_expression::eval_constant(Operator op, Numeric_constant* left_nc, |
5536 | Numeric_constant* right_nc, | |
af7a5274 | 5537 | Location location, Numeric_constant* nc, |
5538 | bool* issued_error) | |
e440a328 | 5539 | { |
af7a5274 | 5540 | *issued_error = false; |
e440a328 | 5541 | switch (op) |
5542 | { | |
5543 | case OPERATOR_OROR: | |
5544 | case OPERATOR_ANDAND: | |
5545 | case OPERATOR_EQEQ: | |
5546 | case OPERATOR_NOTEQ: | |
5547 | case OPERATOR_LT: | |
5548 | case OPERATOR_LE: | |
5549 | case OPERATOR_GT: | |
5550 | case OPERATOR_GE: | |
9767e2d3 | 5551 | // These return boolean values, not numeric. |
5552 | return false; | |
0c77715b | 5553 | default: |
5554 | break; | |
5555 | } | |
5556 | ||
5557 | Type* left_type = left_nc->type(); | |
5558 | Type* right_type = right_nc->type(); | |
5559 | ||
5560 | Type* type; | |
5561 | if (!Binary_expression::operation_type(op, left_type, right_type, &type)) | |
5562 | return false; | |
5563 | ||
5564 | bool is_shift = op == OPERATOR_LSHIFT || op == OPERATOR_RSHIFT; | |
5565 | ||
5566 | // When combining an untyped operand with a typed operand, we are | |
5567 | // effectively coercing the untyped operand to the other operand's | |
5568 | // type, so make sure that is valid. | |
5569 | if (!left_nc->set_type(type, true, location)) | |
5570 | return false; | |
5571 | if (!is_shift && !right_nc->set_type(type, true, location)) | |
5572 | return false; | |
85334a21 | 5573 | if (is_shift |
5574 | && ((left_type->integer_type() == NULL | |
5575 | && !left_type->is_abstract()) | |
5576 | || (right_type->integer_type() == NULL | |
5577 | && !right_type->is_abstract()))) | |
5578 | return false; | |
0c77715b | 5579 | |
5580 | bool r; | |
5581 | if (type->complex_type() != NULL) | |
5582 | r = Binary_expression::eval_complex(op, left_nc, right_nc, location, nc); | |
5583 | else if (type->float_type() != NULL) | |
5584 | r = Binary_expression::eval_float(op, left_nc, right_nc, location, nc); | |
5585 | else | |
5586 | r = Binary_expression::eval_integer(op, left_nc, right_nc, location, nc); | |
5587 | ||
5588 | if (r) | |
af7a5274 | 5589 | { |
5590 | r = nc->set_type(type, true, location); | |
5591 | if (!r) | |
5592 | *issued_error = true; | |
5593 | } | |
0c77715b | 5594 | |
5595 | return r; | |
5596 | } | |
5597 | ||
5598 | // Apply binary opcode OP to LEFT_NC and RIGHT_NC, setting NC, using | |
5599 | // integer operations. Return true if this could be done, false if | |
5600 | // not. | |
5601 | ||
5602 | bool | |
5603 | Binary_expression::eval_integer(Operator op, const Numeric_constant* left_nc, | |
5604 | const Numeric_constant* right_nc, | |
5605 | Location location, Numeric_constant* nc) | |
5606 | { | |
5607 | mpz_t left_val; | |
5608 | if (!left_nc->to_int(&left_val)) | |
5609 | return false; | |
5610 | mpz_t right_val; | |
5611 | if (!right_nc->to_int(&right_val)) | |
5612 | { | |
5613 | mpz_clear(left_val); | |
e440a328 | 5614 | return false; |
0c77715b | 5615 | } |
5616 | ||
5617 | mpz_t val; | |
5618 | mpz_init(val); | |
5619 | ||
5620 | switch (op) | |
5621 | { | |
e440a328 | 5622 | case OPERATOR_PLUS: |
5623 | mpz_add(val, left_val, right_val); | |
2c809f8f | 5624 | if (mpz_sizeinbase(val, 2) > 0x100000) |
5625 | { | |
631d5788 | 5626 | go_error_at(location, "constant addition overflow"); |
71a45216 | 5627 | nc->set_invalid(); |
2c809f8f | 5628 | mpz_set_ui(val, 1); |
5629 | } | |
e440a328 | 5630 | break; |
5631 | case OPERATOR_MINUS: | |
5632 | mpz_sub(val, left_val, right_val); | |
2c809f8f | 5633 | if (mpz_sizeinbase(val, 2) > 0x100000) |
5634 | { | |
631d5788 | 5635 | go_error_at(location, "constant subtraction overflow"); |
71a45216 | 5636 | nc->set_invalid(); |
2c809f8f | 5637 | mpz_set_ui(val, 1); |
5638 | } | |
e440a328 | 5639 | break; |
5640 | case OPERATOR_OR: | |
5641 | mpz_ior(val, left_val, right_val); | |
5642 | break; | |
5643 | case OPERATOR_XOR: | |
5644 | mpz_xor(val, left_val, right_val); | |
5645 | break; | |
5646 | case OPERATOR_MULT: | |
5647 | mpz_mul(val, left_val, right_val); | |
2c809f8f | 5648 | if (mpz_sizeinbase(val, 2) > 0x100000) |
5649 | { | |
631d5788 | 5650 | go_error_at(location, "constant multiplication overflow"); |
71a45216 | 5651 | nc->set_invalid(); |
2c809f8f | 5652 | mpz_set_ui(val, 1); |
5653 | } | |
e440a328 | 5654 | break; |
5655 | case OPERATOR_DIV: | |
5656 | if (mpz_sgn(right_val) != 0) | |
5657 | mpz_tdiv_q(val, left_val, right_val); | |
5658 | else | |
5659 | { | |
631d5788 | 5660 | go_error_at(location, "division by zero"); |
71a45216 | 5661 | nc->set_invalid(); |
e440a328 | 5662 | mpz_set_ui(val, 0); |
e440a328 | 5663 | } |
5664 | break; | |
5665 | case OPERATOR_MOD: | |
5666 | if (mpz_sgn(right_val) != 0) | |
5667 | mpz_tdiv_r(val, left_val, right_val); | |
5668 | else | |
5669 | { | |
631d5788 | 5670 | go_error_at(location, "division by zero"); |
71a45216 | 5671 | nc->set_invalid(); |
e440a328 | 5672 | mpz_set_ui(val, 0); |
e440a328 | 5673 | } |
5674 | break; | |
5675 | case OPERATOR_LSHIFT: | |
5676 | { | |
5677 | unsigned long shift = mpz_get_ui(right_val); | |
0c77715b | 5678 | if (mpz_cmp_ui(right_val, shift) == 0 && shift <= 0x100000) |
5679 | mpz_mul_2exp(val, left_val, shift); | |
5680 | else | |
e440a328 | 5681 | { |
631d5788 | 5682 | go_error_at(location, "shift count overflow"); |
71a45216 | 5683 | nc->set_invalid(); |
2c809f8f | 5684 | mpz_set_ui(val, 1); |
e440a328 | 5685 | } |
e440a328 | 5686 | break; |
5687 | } | |
5688 | break; | |
5689 | case OPERATOR_RSHIFT: | |
5690 | { | |
5691 | unsigned long shift = mpz_get_ui(right_val); | |
5692 | if (mpz_cmp_ui(right_val, shift) != 0) | |
5693 | { | |
631d5788 | 5694 | go_error_at(location, "shift count overflow"); |
71a45216 | 5695 | nc->set_invalid(); |
2c809f8f | 5696 | mpz_set_ui(val, 1); |
e440a328 | 5697 | } |
e440a328 | 5698 | else |
0c77715b | 5699 | { |
5700 | if (mpz_cmp_ui(left_val, 0) >= 0) | |
5701 | mpz_tdiv_q_2exp(val, left_val, shift); | |
5702 | else | |
5703 | mpz_fdiv_q_2exp(val, left_val, shift); | |
5704 | } | |
e440a328 | 5705 | break; |
5706 | } | |
5707 | break; | |
5708 | case OPERATOR_AND: | |
5709 | mpz_and(val, left_val, right_val); | |
5710 | break; | |
5711 | case OPERATOR_BITCLEAR: | |
5712 | { | |
5713 | mpz_t tval; | |
5714 | mpz_init(tval); | |
5715 | mpz_com(tval, right_val); | |
5716 | mpz_and(val, left_val, tval); | |
5717 | mpz_clear(tval); | |
5718 | } | |
5719 | break; | |
5720 | default: | |
c3e6f413 | 5721 | go_unreachable(); |
e440a328 | 5722 | } |
5723 | ||
0c77715b | 5724 | mpz_clear(left_val); |
5725 | mpz_clear(right_val); | |
e440a328 | 5726 | |
0c77715b | 5727 | if (left_nc->is_rune() |
5728 | || (op != OPERATOR_LSHIFT | |
5729 | && op != OPERATOR_RSHIFT | |
5730 | && right_nc->is_rune())) | |
5731 | nc->set_rune(NULL, val); | |
5732 | else | |
5733 | nc->set_int(NULL, val); | |
5734 | ||
5735 | mpz_clear(val); | |
e440a328 | 5736 | |
5737 | return true; | |
5738 | } | |
5739 | ||
0c77715b | 5740 | // Apply binary opcode OP to LEFT_NC and RIGHT_NC, setting NC, using |
5741 | // floating point operations. Return true if this could be done, | |
5742 | // false if not. | |
e440a328 | 5743 | |
5744 | bool | |
0c77715b | 5745 | Binary_expression::eval_float(Operator op, const Numeric_constant* left_nc, |
5746 | const Numeric_constant* right_nc, | |
5747 | Location location, Numeric_constant* nc) | |
e440a328 | 5748 | { |
0c77715b | 5749 | mpfr_t left_val; |
5750 | if (!left_nc->to_float(&left_val)) | |
5751 | return false; | |
5752 | mpfr_t right_val; | |
5753 | if (!right_nc->to_float(&right_val)) | |
e440a328 | 5754 | { |
0c77715b | 5755 | mpfr_clear(left_val); |
e440a328 | 5756 | return false; |
0c77715b | 5757 | } |
5758 | ||
5759 | mpfr_t val; | |
5760 | mpfr_init(val); | |
5761 | ||
5762 | bool ret = true; | |
5763 | switch (op) | |
5764 | { | |
e440a328 | 5765 | case OPERATOR_PLUS: |
5766 | mpfr_add(val, left_val, right_val, GMP_RNDN); | |
5767 | break; | |
5768 | case OPERATOR_MINUS: | |
5769 | mpfr_sub(val, left_val, right_val, GMP_RNDN); | |
5770 | break; | |
5771 | case OPERATOR_OR: | |
5772 | case OPERATOR_XOR: | |
5773 | case OPERATOR_AND: | |
5774 | case OPERATOR_BITCLEAR: | |
0c77715b | 5775 | case OPERATOR_MOD: |
5776 | case OPERATOR_LSHIFT: | |
5777 | case OPERATOR_RSHIFT: | |
5778 | mpfr_set_ui(val, 0, GMP_RNDN); | |
5779 | ret = false; | |
5780 | break; | |
e440a328 | 5781 | case OPERATOR_MULT: |
5782 | mpfr_mul(val, left_val, right_val, GMP_RNDN); | |
5783 | break; | |
5784 | case OPERATOR_DIV: | |
0c77715b | 5785 | if (!mpfr_zero_p(right_val)) |
5786 | mpfr_div(val, left_val, right_val, GMP_RNDN); | |
5787 | else | |
5788 | { | |
631d5788 | 5789 | go_error_at(location, "division by zero"); |
71a45216 | 5790 | nc->set_invalid(); |
0c77715b | 5791 | mpfr_set_ui(val, 0, GMP_RNDN); |
5792 | } | |
e440a328 | 5793 | break; |
e440a328 | 5794 | default: |
c3e6f413 | 5795 | go_unreachable(); |
e440a328 | 5796 | } |
5797 | ||
0c77715b | 5798 | mpfr_clear(left_val); |
5799 | mpfr_clear(right_val); | |
e440a328 | 5800 | |
0c77715b | 5801 | nc->set_float(NULL, val); |
5802 | mpfr_clear(val); | |
e440a328 | 5803 | |
0c77715b | 5804 | return ret; |
e440a328 | 5805 | } |
5806 | ||
0c77715b | 5807 | // Apply binary opcode OP to LEFT_NC and RIGHT_NC, setting NC, using |
5808 | // complex operations. Return true if this could be done, false if | |
5809 | // not. | |
e440a328 | 5810 | |
5811 | bool | |
0c77715b | 5812 | Binary_expression::eval_complex(Operator op, const Numeric_constant* left_nc, |
5813 | const Numeric_constant* right_nc, | |
5814 | Location location, Numeric_constant* nc) | |
e440a328 | 5815 | { |
fcbea5e4 | 5816 | mpc_t left_val; |
5817 | if (!left_nc->to_complex(&left_val)) | |
0c77715b | 5818 | return false; |
fcbea5e4 | 5819 | mpc_t right_val; |
5820 | if (!right_nc->to_complex(&right_val)) | |
e440a328 | 5821 | { |
fcbea5e4 | 5822 | mpc_clear(left_val); |
e440a328 | 5823 | return false; |
0c77715b | 5824 | } |
5825 | ||
fcbea5e4 | 5826 | mpc_t val; |
5827 | mpc_init2(val, mpc_precision); | |
0c77715b | 5828 | |
5829 | bool ret = true; | |
5830 | switch (op) | |
5831 | { | |
e440a328 | 5832 | case OPERATOR_PLUS: |
fcbea5e4 | 5833 | mpc_add(val, left_val, right_val, MPC_RNDNN); |
e440a328 | 5834 | break; |
5835 | case OPERATOR_MINUS: | |
fcbea5e4 | 5836 | mpc_sub(val, left_val, right_val, MPC_RNDNN); |
e440a328 | 5837 | break; |
5838 | case OPERATOR_OR: | |
5839 | case OPERATOR_XOR: | |
5840 | case OPERATOR_AND: | |
5841 | case OPERATOR_BITCLEAR: | |
0c77715b | 5842 | case OPERATOR_MOD: |
5843 | case OPERATOR_LSHIFT: | |
5844 | case OPERATOR_RSHIFT: | |
fcbea5e4 | 5845 | mpc_set_ui(val, 0, MPC_RNDNN); |
0c77715b | 5846 | ret = false; |
5847 | break; | |
e440a328 | 5848 | case OPERATOR_MULT: |
fcbea5e4 | 5849 | mpc_mul(val, left_val, right_val, MPC_RNDNN); |
e440a328 | 5850 | break; |
5851 | case OPERATOR_DIV: | |
fcbea5e4 | 5852 | if (mpc_cmp_si(right_val, 0) == 0) |
5853 | { | |
631d5788 | 5854 | go_error_at(location, "division by zero"); |
71a45216 | 5855 | nc->set_invalid(); |
fcbea5e4 | 5856 | mpc_set_ui(val, 0, MPC_RNDNN); |
5857 | break; | |
5858 | } | |
5859 | mpc_div(val, left_val, right_val, MPC_RNDNN); | |
e440a328 | 5860 | break; |
e440a328 | 5861 | default: |
c3e6f413 | 5862 | go_unreachable(); |
e440a328 | 5863 | } |
5864 | ||
fcbea5e4 | 5865 | mpc_clear(left_val); |
5866 | mpc_clear(right_val); | |
e440a328 | 5867 | |
fcbea5e4 | 5868 | nc->set_complex(NULL, val); |
5869 | mpc_clear(val); | |
e440a328 | 5870 | |
0c77715b | 5871 | return ret; |
e440a328 | 5872 | } |
5873 | ||
5874 | // Lower a binary expression. We have to evaluate constant | |
5875 | // expressions now, in order to implement Go's unlimited precision | |
5876 | // constants. | |
5877 | ||
5878 | Expression* | |
e9d3367e | 5879 | Binary_expression::do_lower(Gogo* gogo, Named_object*, |
5880 | Statement_inserter* inserter, int) | |
e440a328 | 5881 | { |
b13c66cd | 5882 | Location location = this->location(); |
e440a328 | 5883 | Operator op = this->op_; |
5884 | Expression* left = this->left_; | |
5885 | Expression* right = this->right_; | |
5886 | ||
5887 | const bool is_comparison = (op == OPERATOR_EQEQ | |
5888 | || op == OPERATOR_NOTEQ | |
5889 | || op == OPERATOR_LT | |
5890 | || op == OPERATOR_LE | |
5891 | || op == OPERATOR_GT | |
5892 | || op == OPERATOR_GE); | |
5893 | ||
0c77715b | 5894 | // Numeric constant expressions. |
e440a328 | 5895 | { |
0c77715b | 5896 | Numeric_constant left_nc; |
5897 | Numeric_constant right_nc; | |
5898 | if (left->numeric_constant_value(&left_nc) | |
5899 | && right->numeric_constant_value(&right_nc)) | |
e440a328 | 5900 | { |
0c77715b | 5901 | if (is_comparison) |
e440a328 | 5902 | { |
0c77715b | 5903 | bool result; |
5904 | if (!Binary_expression::compare_constant(op, &left_nc, | |
5905 | &right_nc, location, | |
5906 | &result)) | |
5907 | return this; | |
e90c9dfc | 5908 | return Expression::make_cast(Type::make_boolean_type(), |
0c77715b | 5909 | Expression::make_boolean(result, |
5910 | location), | |
5911 | location); | |
e440a328 | 5912 | } |
5913 | else | |
5914 | { | |
0c77715b | 5915 | Numeric_constant nc; |
af7a5274 | 5916 | bool issued_error; |
0c77715b | 5917 | if (!Binary_expression::eval_constant(op, &left_nc, &right_nc, |
af7a5274 | 5918 | location, &nc, |
5919 | &issued_error)) | |
5920 | { | |
5921 | if (issued_error) | |
5922 | return Expression::make_error(location); | |
71a45216 | 5923 | return this; |
af7a5274 | 5924 | } |
0c77715b | 5925 | return nc.expression(location); |
e440a328 | 5926 | } |
5927 | } | |
e440a328 | 5928 | } |
5929 | ||
5930 | // String constant expressions. | |
4713b5b9 | 5931 | // |
5932 | // Avoid constant folding here if the left and right types are incompatible | |
5933 | // (leave the operation intact so that the type checker can complain about it | |
5934 | // later on). If concatenating an abstract string with a named string type, | |
5935 | // result type needs to be of the named type (see issue 31412). | |
5936 | if (left->type()->is_string_type() | |
5937 | && right->type()->is_string_type() | |
5938 | && (left->type()->named_type() == NULL | |
5939 | || right->type()->named_type() == NULL | |
5940 | || left->type()->named_type() == right->type()->named_type())) | |
e440a328 | 5941 | { |
5942 | std::string left_string; | |
5943 | std::string right_string; | |
5944 | if (left->string_constant_value(&left_string) | |
5945 | && right->string_constant_value(&right_string)) | |
315fa98d | 5946 | { |
5947 | if (op == OPERATOR_PLUS) | |
4713b5b9 | 5948 | { |
5949 | Type* result_type = (left->type()->named_type() != NULL | |
5950 | ? left->type() | |
5951 | : right->type()); | |
5952 | return Expression::make_string_typed(left_string + right_string, | |
5953 | result_type, location); | |
5954 | } | |
315fa98d | 5955 | else if (is_comparison) |
5956 | { | |
5957 | int cmp = left_string.compare(right_string); | |
0c77715b | 5958 | bool r = Binary_expression::cmp_to_bool(op, cmp); |
e90c9dfc | 5959 | return Expression::make_boolean(r, location); |
b40dc774 | 5960 | } |
5961 | } | |
b40dc774 | 5962 | } |
5963 | ||
ceeb12d7 | 5964 | // Lower struct, array, and some interface comparisons. |
e9d3367e | 5965 | if (op == OPERATOR_EQEQ || op == OPERATOR_NOTEQ) |
5966 | { | |
b79832ca | 5967 | if (left->type()->struct_type() != NULL |
5968 | && right->type()->struct_type() != NULL) | |
e9d3367e | 5969 | return this->lower_struct_comparison(gogo, inserter); |
5970 | else if (left->type()->array_type() != NULL | |
b79832ca | 5971 | && !left->type()->is_slice_type() |
5972 | && right->type()->array_type() != NULL | |
5973 | && !right->type()->is_slice_type()) | |
e9d3367e | 5974 | return this->lower_array_comparison(gogo, inserter); |
ceeb12d7 | 5975 | else if ((left->type()->interface_type() != NULL |
5976 | && right->type()->interface_type() == NULL) | |
5977 | || (left->type()->interface_type() == NULL | |
5978 | && right->type()->interface_type() != NULL)) | |
5979 | return this->lower_interface_value_comparison(gogo, inserter); | |
e9d3367e | 5980 | } |
5981 | ||
736a16ba | 5982 | // Lower string concatenation to String_concat_expression, so that |
5983 | // we can group sequences of string additions. | |
5984 | if (this->left_->type()->is_string_type() && this->op_ == OPERATOR_PLUS) | |
5985 | { | |
5986 | Expression_list* exprs; | |
5987 | String_concat_expression* left_sce = | |
5988 | this->left_->string_concat_expression(); | |
5989 | if (left_sce != NULL) | |
5990 | exprs = left_sce->exprs(); | |
5991 | else | |
5992 | { | |
5993 | exprs = new Expression_list(); | |
5994 | exprs->push_back(this->left_); | |
5995 | } | |
5996 | ||
5997 | String_concat_expression* right_sce = | |
5998 | this->right_->string_concat_expression(); | |
5999 | if (right_sce != NULL) | |
6000 | exprs->append(right_sce->exprs()); | |
6001 | else | |
6002 | exprs->push_back(this->right_); | |
6003 | ||
6004 | return Expression::make_string_concat(exprs); | |
6005 | } | |
6006 | ||
e440a328 | 6007 | return this; |
6008 | } | |
6009 | ||
e9d3367e | 6010 | // Lower a struct comparison. |
6011 | ||
6012 | Expression* | |
6013 | Binary_expression::lower_struct_comparison(Gogo* gogo, | |
6014 | Statement_inserter* inserter) | |
6015 | { | |
6016 | Struct_type* st = this->left_->type()->struct_type(); | |
6017 | Struct_type* st2 = this->right_->type()->struct_type(); | |
6018 | if (st2 == NULL) | |
6019 | return this; | |
3a522dcc | 6020 | if (st != st2 |
6021 | && !Type::are_identical(st, st2, | |
6022 | Type::COMPARE_ERRORS | Type::COMPARE_TAGS, | |
6023 | NULL)) | |
e9d3367e | 6024 | return this; |
6025 | if (!Type::are_compatible_for_comparison(true, this->left_->type(), | |
6026 | this->right_->type(), NULL)) | |
6027 | return this; | |
6028 | ||
6029 | // See if we can compare using memcmp. As a heuristic, we use | |
6030 | // memcmp rather than field references and comparisons if there are | |
6031 | // more than two fields. | |
113ef6a5 | 6032 | if (st->compare_is_identity(gogo) && st->total_field_count() > 2) |
e9d3367e | 6033 | return this->lower_compare_to_memcmp(gogo, inserter); |
6034 | ||
6035 | Location loc = this->location(); | |
6036 | ||
6037 | Expression* left = this->left_; | |
6038 | Temporary_statement* left_temp = NULL; | |
6039 | if (left->var_expression() == NULL | |
6040 | && left->temporary_reference_expression() == NULL) | |
6041 | { | |
6042 | left_temp = Statement::make_temporary(left->type(), NULL, loc); | |
6043 | inserter->insert(left_temp); | |
6044 | left = Expression::make_set_and_use_temporary(left_temp, left, loc); | |
6045 | } | |
6046 | ||
6047 | Expression* right = this->right_; | |
6048 | Temporary_statement* right_temp = NULL; | |
6049 | if (right->var_expression() == NULL | |
6050 | && right->temporary_reference_expression() == NULL) | |
6051 | { | |
6052 | right_temp = Statement::make_temporary(right->type(), NULL, loc); | |
6053 | inserter->insert(right_temp); | |
6054 | right = Expression::make_set_and_use_temporary(right_temp, right, loc); | |
6055 | } | |
6056 | ||
6057 | Expression* ret = Expression::make_boolean(true, loc); | |
6058 | const Struct_field_list* fields = st->fields(); | |
6059 | unsigned int field_index = 0; | |
6060 | for (Struct_field_list::const_iterator pf = fields->begin(); | |
6061 | pf != fields->end(); | |
6062 | ++pf, ++field_index) | |
6063 | { | |
f5165c05 | 6064 | if (Gogo::is_sink_name(pf->field_name())) |
6065 | continue; | |
6066 | ||
e9d3367e | 6067 | if (field_index > 0) |
6068 | { | |
6069 | if (left_temp == NULL) | |
6070 | left = left->copy(); | |
6071 | else | |
6072 | left = Expression::make_temporary_reference(left_temp, loc); | |
6073 | if (right_temp == NULL) | |
6074 | right = right->copy(); | |
6075 | else | |
6076 | right = Expression::make_temporary_reference(right_temp, loc); | |
6077 | } | |
6078 | Expression* f1 = Expression::make_field_reference(left, field_index, | |
6079 | loc); | |
6080 | Expression* f2 = Expression::make_field_reference(right, field_index, | |
6081 | loc); | |
6082 | Expression* cond = Expression::make_binary(OPERATOR_EQEQ, f1, f2, loc); | |
6083 | ret = Expression::make_binary(OPERATOR_ANDAND, ret, cond, loc); | |
6084 | } | |
6085 | ||
6086 | if (this->op_ == OPERATOR_NOTEQ) | |
6087 | ret = Expression::make_unary(OPERATOR_NOT, ret, loc); | |
6088 | ||
6089 | return ret; | |
6090 | } | |
6091 | ||
6092 | // Lower an array comparison. | |
6093 | ||
6094 | Expression* | |
6095 | Binary_expression::lower_array_comparison(Gogo* gogo, | |
6096 | Statement_inserter* inserter) | |
6097 | { | |
6098 | Array_type* at = this->left_->type()->array_type(); | |
6099 | Array_type* at2 = this->right_->type()->array_type(); | |
6100 | if (at2 == NULL) | |
6101 | return this; | |
3a522dcc | 6102 | if (at != at2 |
6103 | && !Type::are_identical(at, at2, | |
6104 | Type::COMPARE_ERRORS | Type::COMPARE_TAGS, | |
6105 | NULL)) | |
e9d3367e | 6106 | return this; |
6107 | if (!Type::are_compatible_for_comparison(true, this->left_->type(), | |
6108 | this->right_->type(), NULL)) | |
6109 | return this; | |
6110 | ||
6111 | // Call memcmp directly if possible. This may let the middle-end | |
6112 | // optimize the call. | |
113ef6a5 | 6113 | if (at->compare_is_identity(gogo)) |
e9d3367e | 6114 | return this->lower_compare_to_memcmp(gogo, inserter); |
6115 | ||
6116 | // Call the array comparison function. | |
6117 | Named_object* hash_fn; | |
6118 | Named_object* equal_fn; | |
6119 | at->type_functions(gogo, this->left_->type()->named_type(), NULL, NULL, | |
6120 | &hash_fn, &equal_fn); | |
6121 | ||
6122 | Location loc = this->location(); | |
6123 | ||
6124 | Expression* func = Expression::make_func_reference(equal_fn, NULL, loc); | |
6125 | ||
6126 | Expression_list* args = new Expression_list(); | |
6127 | args->push_back(this->operand_address(inserter, this->left_)); | |
6128 | args->push_back(this->operand_address(inserter, this->right_)); | |
e9d3367e | 6129 | |
6130 | Expression* ret = Expression::make_call(func, args, false, loc); | |
6131 | ||
6132 | if (this->op_ == OPERATOR_NOTEQ) | |
6133 | ret = Expression::make_unary(OPERATOR_NOT, ret, loc); | |
6134 | ||
6135 | return ret; | |
6136 | } | |
6137 | ||
ceeb12d7 | 6138 | // Lower an interface to value comparison. |
6139 | ||
6140 | Expression* | |
6141 | Binary_expression::lower_interface_value_comparison(Gogo*, | |
6142 | Statement_inserter* inserter) | |
6143 | { | |
6144 | Type* left_type = this->left_->type(); | |
6145 | Type* right_type = this->right_->type(); | |
6146 | Interface_type* ift; | |
6147 | if (left_type->interface_type() != NULL) | |
6148 | { | |
6149 | ift = left_type->interface_type(); | |
6150 | if (!ift->implements_interface(right_type, NULL)) | |
6151 | return this; | |
6152 | } | |
6153 | else | |
6154 | { | |
6155 | ift = right_type->interface_type(); | |
6156 | if (!ift->implements_interface(left_type, NULL)) | |
6157 | return this; | |
6158 | } | |
6159 | if (!Type::are_compatible_for_comparison(true, left_type, right_type, NULL)) | |
6160 | return this; | |
6161 | ||
6162 | Location loc = this->location(); | |
6163 | ||
6164 | if (left_type->interface_type() == NULL | |
6165 | && left_type->points_to() == NULL | |
6166 | && !this->left_->is_addressable()) | |
6167 | { | |
6168 | Temporary_statement* temp = | |
6169 | Statement::make_temporary(left_type, NULL, loc); | |
6170 | inserter->insert(temp); | |
6171 | this->left_ = | |
6172 | Expression::make_set_and_use_temporary(temp, this->left_, loc); | |
6173 | } | |
6174 | ||
6175 | if (right_type->interface_type() == NULL | |
6176 | && right_type->points_to() == NULL | |
6177 | && !this->right_->is_addressable()) | |
6178 | { | |
6179 | Temporary_statement* temp = | |
6180 | Statement::make_temporary(right_type, NULL, loc); | |
6181 | inserter->insert(temp); | |
6182 | this->right_ = | |
6183 | Expression::make_set_and_use_temporary(temp, this->right_, loc); | |
6184 | } | |
6185 | ||
6186 | return this; | |
6187 | } | |
6188 | ||
e9d3367e | 6189 | // Lower a struct or array comparison to a call to memcmp. |
6190 | ||
6191 | Expression* | |
6192 | Binary_expression::lower_compare_to_memcmp(Gogo*, Statement_inserter* inserter) | |
6193 | { | |
6194 | Location loc = this->location(); | |
6195 | ||
6196 | Expression* a1 = this->operand_address(inserter, this->left_); | |
6197 | Expression* a2 = this->operand_address(inserter, this->right_); | |
6198 | Expression* len = Expression::make_type_info(this->left_->type(), | |
6199 | TYPE_INFO_SIZE); | |
6200 | ||
6201 | Expression* call = Runtime::make_call(Runtime::MEMCMP, loc, 3, a1, a2, len); | |
dbebbff8 | 6202 | Type* int32_type = Type::lookup_integer_type("int32"); |
6203 | Expression* zero = Expression::make_integer_ul(0, int32_type, loc); | |
e9d3367e | 6204 | return Expression::make_binary(this->op_, call, zero, loc); |
6205 | } | |
6206 | ||
a32698ee | 6207 | Expression* |
5c3f3470 | 6208 | Binary_expression::do_flatten(Gogo* gogo, Named_object*, |
a32698ee | 6209 | Statement_inserter* inserter) |
6210 | { | |
6211 | Location loc = this->location(); | |
5bf8be8b | 6212 | if (this->left_->type()->is_error_type() |
6213 | || this->right_->type()->is_error_type() | |
6214 | || this->left_->is_error_expression() | |
6215 | || this->right_->is_error_expression()) | |
6216 | { | |
6217 | go_assert(saw_errors()); | |
6218 | return Expression::make_error(loc); | |
6219 | } | |
6220 | ||
a32698ee | 6221 | Temporary_statement* temp; |
a32698ee | 6222 | |
6223 | Type* left_type = this->left_->type(); | |
6224 | bool is_shift_op = (this->op_ == OPERATOR_LSHIFT | |
6225 | || this->op_ == OPERATOR_RSHIFT); | |
6226 | bool is_idiv_op = ((this->op_ == OPERATOR_DIV && | |
6227 | left_type->integer_type() != NULL) | |
6228 | || this->op_ == OPERATOR_MOD); | |
aad830e6 | 6229 | bool is_string_op = (left_type->is_string_type() |
6230 | && this->right_->type()->is_string_type()); | |
6231 | ||
6232 | if (is_string_op) | |
6233 | { | |
6234 | // Mark string([]byte) operands to reuse the backing store. | |
6235 | // String comparison does not keep the reference, so it is safe. | |
6236 | Type_conversion_expression* lce = | |
6237 | this->left_->conversion_expression(); | |
6238 | if (lce != NULL && lce->expr()->type()->is_slice_type()) | |
6239 | lce->set_no_copy(true); | |
6240 | Type_conversion_expression* rce = | |
6241 | this->right_->conversion_expression(); | |
6242 | if (rce != NULL && rce->expr()->type()->is_slice_type()) | |
6243 | rce->set_no_copy(true); | |
6244 | } | |
a32698ee | 6245 | |
a32698ee | 6246 | if (is_shift_op |
5c3f3470 | 6247 | || (is_idiv_op |
aad830e6 | 6248 | && (gogo->check_divide_by_zero() || gogo->check_divide_overflow())) |
6249 | || is_string_op) | |
a32698ee | 6250 | { |
545ab43b | 6251 | if (!this->left_->is_variable() && !this->left_->is_constant()) |
a32698ee | 6252 | { |
6253 | temp = Statement::make_temporary(NULL, this->left_, loc); | |
6254 | inserter->insert(temp); | |
6255 | this->left_ = Expression::make_temporary_reference(temp, loc); | |
6256 | } | |
545ab43b | 6257 | if (!this->right_->is_variable() && !this->right_->is_constant()) |
a32698ee | 6258 | { |
6259 | temp = | |
6260 | Statement::make_temporary(NULL, this->right_, loc); | |
6261 | this->right_ = Expression::make_temporary_reference(temp, loc); | |
6262 | inserter->insert(temp); | |
6263 | } | |
6264 | } | |
6265 | return this; | |
6266 | } | |
6267 | ||
6268 | ||
e9d3367e | 6269 | // Return the address of EXPR, cast to unsafe.Pointer. |
6270 | ||
6271 | Expression* | |
6272 | Binary_expression::operand_address(Statement_inserter* inserter, | |
6273 | Expression* expr) | |
6274 | { | |
6275 | Location loc = this->location(); | |
6276 | ||
6277 | if (!expr->is_addressable()) | |
6278 | { | |
6279 | Temporary_statement* temp = Statement::make_temporary(expr->type(), NULL, | |
6280 | loc); | |
6281 | inserter->insert(temp); | |
6282 | expr = Expression::make_set_and_use_temporary(temp, expr, loc); | |
6283 | } | |
6284 | expr = Expression::make_unary(OPERATOR_AND, expr, loc); | |
6285 | static_cast<Unary_expression*>(expr)->set_does_not_escape(); | |
6286 | Type* void_type = Type::make_void_type(); | |
6287 | Type* unsafe_pointer_type = Type::make_pointer_type(void_type); | |
6288 | return Expression::make_cast(unsafe_pointer_type, expr, loc); | |
6289 | } | |
6290 | ||
0c77715b | 6291 | // Return the numeric constant value, if it has one. |
e440a328 | 6292 | |
6293 | bool | |
0c77715b | 6294 | Binary_expression::do_numeric_constant_value(Numeric_constant* nc) const |
e440a328 | 6295 | { |
0c77715b | 6296 | Numeric_constant left_nc; |
6297 | if (!this->left_->numeric_constant_value(&left_nc)) | |
6298 | return false; | |
6299 | Numeric_constant right_nc; | |
6300 | if (!this->right_->numeric_constant_value(&right_nc)) | |
6301 | return false; | |
af7a5274 | 6302 | bool issued_error; |
9767e2d3 | 6303 | return Binary_expression::eval_constant(this->op_, &left_nc, &right_nc, |
af7a5274 | 6304 | this->location(), nc, &issued_error); |
e440a328 | 6305 | } |
6306 | ||
ac7ef97d | 6307 | // Return the boolean constant value, if it has one. |
6308 | ||
6309 | bool | |
6310 | Binary_expression::do_boolean_constant_value(bool* val) const | |
6311 | { | |
6312 | bool is_comparison = false; | |
6313 | switch (this->op_) | |
6314 | { | |
6315 | case OPERATOR_EQEQ: | |
6316 | case OPERATOR_NOTEQ: | |
6317 | case OPERATOR_LT: | |
6318 | case OPERATOR_LE: | |
6319 | case OPERATOR_GT: | |
6320 | case OPERATOR_GE: | |
6321 | is_comparison = true; | |
6322 | break; | |
6323 | case OPERATOR_ANDAND: | |
6324 | case OPERATOR_OROR: | |
6325 | break; | |
6326 | default: | |
6327 | return false; | |
6328 | } | |
6329 | ||
6330 | Numeric_constant left_nc, right_nc; | |
6331 | if (is_comparison | |
6332 | && this->left_->numeric_constant_value(&left_nc) | |
6333 | && this->right_->numeric_constant_value(&right_nc)) | |
6334 | return Binary_expression::compare_constant(this->op_, &left_nc, | |
6335 | &right_nc, | |
6336 | this->location(), | |
6337 | val); | |
6338 | ||
6339 | std::string left_str, right_str; | |
6340 | if (is_comparison | |
6341 | && this->left_->string_constant_value(&left_str) | |
6342 | && this->right_->string_constant_value(&right_str)) | |
6343 | { | |
6344 | *val = Binary_expression::cmp_to_bool(this->op_, | |
6345 | left_str.compare(right_str)); | |
6346 | return true; | |
6347 | } | |
6348 | ||
6349 | bool left_bval; | |
6350 | if (this->left_->boolean_constant_value(&left_bval)) | |
6351 | { | |
6352 | if (this->op_ == OPERATOR_ANDAND && !left_bval) | |
6353 | { | |
6354 | *val = false; | |
6355 | return true; | |
6356 | } | |
6357 | else if (this->op_ == OPERATOR_OROR && left_bval) | |
6358 | { | |
6359 | *val = true; | |
6360 | return true; | |
6361 | } | |
6362 | ||
6363 | bool right_bval; | |
6364 | if (this->right_->boolean_constant_value(&right_bval)) | |
6365 | { | |
6366 | switch (this->op_) | |
6367 | { | |
6368 | case OPERATOR_EQEQ: | |
6369 | *val = (left_bval == right_bval); | |
6370 | return true; | |
6371 | case OPERATOR_NOTEQ: | |
6372 | *val = (left_bval != right_bval); | |
6373 | return true; | |
6374 | case OPERATOR_ANDAND: | |
6375 | case OPERATOR_OROR: | |
6376 | *val = right_bval; | |
6377 | return true; | |
6378 | default: | |
6379 | go_unreachable(); | |
6380 | } | |
6381 | } | |
6382 | } | |
6383 | ||
6384 | return false; | |
6385 | } | |
6386 | ||
e440a328 | 6387 | // Note that the value is being discarded. |
6388 | ||
4f2138d7 | 6389 | bool |
e440a328 | 6390 | Binary_expression::do_discarding_value() |
6391 | { | |
6392 | if (this->op_ == OPERATOR_OROR || this->op_ == OPERATOR_ANDAND) | |
4f2138d7 | 6393 | return this->right_->discarding_value(); |
e440a328 | 6394 | else |
4f2138d7 | 6395 | { |
6396 | this->unused_value_error(); | |
6397 | return false; | |
6398 | } | |
e440a328 | 6399 | } |
6400 | ||
6401 | // Get type. | |
6402 | ||
6403 | Type* | |
6404 | Binary_expression::do_type() | |
6405 | { | |
5f5fea79 | 6406 | if (this->classification() == EXPRESSION_ERROR) |
6407 | return Type::make_error_type(); | |
6408 | ||
e440a328 | 6409 | switch (this->op_) |
6410 | { | |
e440a328 | 6411 | case OPERATOR_EQEQ: |
6412 | case OPERATOR_NOTEQ: | |
6413 | case OPERATOR_LT: | |
6414 | case OPERATOR_LE: | |
6415 | case OPERATOR_GT: | |
6416 | case OPERATOR_GE: | |
e90c9dfc | 6417 | if (this->type_ == NULL) |
6418 | this->type_ = Type::make_boolean_type(); | |
6419 | return this->type_; | |
e440a328 | 6420 | |
6421 | case OPERATOR_PLUS: | |
6422 | case OPERATOR_MINUS: | |
6423 | case OPERATOR_OR: | |
6424 | case OPERATOR_XOR: | |
6425 | case OPERATOR_MULT: | |
6426 | case OPERATOR_DIV: | |
6427 | case OPERATOR_MOD: | |
6428 | case OPERATOR_AND: | |
6429 | case OPERATOR_BITCLEAR: | |
e90c9dfc | 6430 | case OPERATOR_OROR: |
6431 | case OPERATOR_ANDAND: | |
e440a328 | 6432 | { |
0c77715b | 6433 | Type* type; |
6434 | if (!Binary_expression::operation_type(this->op_, | |
6435 | this->left_->type(), | |
6436 | this->right_->type(), | |
6437 | &type)) | |
6438 | return Type::make_error_type(); | |
6439 | return type; | |
e440a328 | 6440 | } |
6441 | ||
6442 | case OPERATOR_LSHIFT: | |
6443 | case OPERATOR_RSHIFT: | |
6444 | return this->left_->type(); | |
6445 | ||
6446 | default: | |
c3e6f413 | 6447 | go_unreachable(); |
e440a328 | 6448 | } |
6449 | } | |
6450 | ||
6451 | // Set type for a binary expression. | |
6452 | ||
6453 | void | |
6454 | Binary_expression::do_determine_type(const Type_context* context) | |
6455 | { | |
6456 | Type* tleft = this->left_->type(); | |
6457 | Type* tright = this->right_->type(); | |
6458 | ||
6459 | // Both sides should have the same type, except for the shift | |
6460 | // operations. For a comparison, we should ignore the incoming | |
6461 | // type. | |
6462 | ||
6463 | bool is_shift_op = (this->op_ == OPERATOR_LSHIFT | |
6464 | || this->op_ == OPERATOR_RSHIFT); | |
6465 | ||
6466 | bool is_comparison = (this->op_ == OPERATOR_EQEQ | |
6467 | || this->op_ == OPERATOR_NOTEQ | |
6468 | || this->op_ == OPERATOR_LT | |
6469 | || this->op_ == OPERATOR_LE | |
6470 | || this->op_ == OPERATOR_GT | |
6471 | || this->op_ == OPERATOR_GE); | |
6472 | ||
c999c2a7 | 6473 | // For constant expressions, the context of the result is not useful in |
6474 | // determining the types of the operands. It is only legal to use abstract | |
6475 | // boolean, numeric, and string constants as operands where it is legal to | |
6476 | // use non-abstract boolean, numeric, and string constants, respectively. | |
6477 | // Any issues with the operation will be resolved in the check_types pass. | |
6478 | bool is_constant_expr = (this->left_->is_constant() | |
6479 | && this->right_->is_constant()); | |
6480 | ||
e440a328 | 6481 | Type_context subcontext(*context); |
6482 | ||
9c4ff2ce | 6483 | if (is_constant_expr && !is_shift_op) |
af7a5274 | 6484 | { |
6485 | subcontext.type = NULL; | |
6486 | subcontext.may_be_abstract = true; | |
6487 | } | |
6488 | else if (is_comparison) | |
e440a328 | 6489 | { |
6490 | // In a comparison, the context does not determine the types of | |
6491 | // the operands. | |
6492 | subcontext.type = NULL; | |
6493 | } | |
6494 | ||
6495 | // Set the context for the left hand operand. | |
6496 | if (is_shift_op) | |
6497 | { | |
b40dc774 | 6498 | // The right hand operand of a shift plays no role in |
6499 | // determining the type of the left hand operand. | |
e440a328 | 6500 | } |
6501 | else if (!tleft->is_abstract()) | |
6502 | subcontext.type = tleft; | |
6503 | else if (!tright->is_abstract()) | |
6504 | subcontext.type = tright; | |
6505 | else if (subcontext.type == NULL) | |
6506 | { | |
6507 | if ((tleft->integer_type() != NULL && tright->integer_type() != NULL) | |
6508 | || (tleft->float_type() != NULL && tright->float_type() != NULL) | |
6509 | || (tleft->complex_type() != NULL && tright->complex_type() != NULL)) | |
6510 | { | |
6511 | // Both sides have an abstract integer, abstract float, or | |
6512 | // abstract complex type. Just let CONTEXT determine | |
6513 | // whether they may remain abstract or not. | |
6514 | } | |
6515 | else if (tleft->complex_type() != NULL) | |
6516 | subcontext.type = tleft; | |
6517 | else if (tright->complex_type() != NULL) | |
6518 | subcontext.type = tright; | |
6519 | else if (tleft->float_type() != NULL) | |
6520 | subcontext.type = tleft; | |
6521 | else if (tright->float_type() != NULL) | |
6522 | subcontext.type = tright; | |
6523 | else | |
6524 | subcontext.type = tleft; | |
f58a23ae | 6525 | |
6526 | if (subcontext.type != NULL && !context->may_be_abstract) | |
6527 | subcontext.type = subcontext.type->make_non_abstract_type(); | |
e440a328 | 6528 | } |
6529 | ||
af7a5274 | 6530 | this->left_->determine_type(&subcontext); |
e440a328 | 6531 | |
e440a328 | 6532 | if (is_shift_op) |
6533 | { | |
b40dc774 | 6534 | // We may have inherited an unusable type for the shift operand. |
6535 | // Give a useful error if that happened. | |
6536 | if (tleft->is_abstract() | |
6537 | && subcontext.type != NULL | |
8ab6effb | 6538 | && !subcontext.may_be_abstract |
f6bc81e6 | 6539 | && subcontext.type->interface_type() == NULL |
8ab6effb | 6540 | && subcontext.type->integer_type() == NULL) |
b40dc774 | 6541 | this->report_error(("invalid context-determined non-integer type " |
8ab6effb | 6542 | "for left operand of shift")); |
b40dc774 | 6543 | |
6544 | // The context for the right hand operand is the same as for the | |
6545 | // left hand operand, except for a shift operator. | |
e440a328 | 6546 | subcontext.type = Type::lookup_integer_type("uint"); |
6547 | subcontext.may_be_abstract = false; | |
6548 | } | |
6549 | ||
af7a5274 | 6550 | this->right_->determine_type(&subcontext); |
e90c9dfc | 6551 | |
6552 | if (is_comparison) | |
6553 | { | |
6554 | if (this->type_ != NULL && !this->type_->is_abstract()) | |
6555 | ; | |
6556 | else if (context->type != NULL && context->type->is_boolean_type()) | |
6557 | this->type_ = context->type; | |
6558 | else if (!context->may_be_abstract) | |
6559 | this->type_ = Type::lookup_bool_type(); | |
6560 | } | |
e440a328 | 6561 | } |
6562 | ||
6563 | // Report an error if the binary operator OP does not support TYPE. | |
be8b5eee | 6564 | // OTYPE is the type of the other operand. Return whether the |
6565 | // operation is OK. This should not be used for shift. | |
e440a328 | 6566 | |
6567 | bool | |
be8b5eee | 6568 | Binary_expression::check_operator_type(Operator op, Type* type, Type* otype, |
b13c66cd | 6569 | Location location) |
e440a328 | 6570 | { |
6571 | switch (op) | |
6572 | { | |
6573 | case OPERATOR_OROR: | |
6574 | case OPERATOR_ANDAND: | |
c999c2a7 | 6575 | if (!type->is_boolean_type() |
6576 | || !otype->is_boolean_type()) | |
e440a328 | 6577 | { |
631d5788 | 6578 | go_error_at(location, "expected boolean type"); |
e440a328 | 6579 | return false; |
6580 | } | |
6581 | break; | |
6582 | ||
6583 | case OPERATOR_EQEQ: | |
6584 | case OPERATOR_NOTEQ: | |
e9d3367e | 6585 | { |
6586 | std::string reason; | |
6587 | if (!Type::are_compatible_for_comparison(true, type, otype, &reason)) | |
6588 | { | |
631d5788 | 6589 | go_error_at(location, "%s", reason.c_str()); |
e9d3367e | 6590 | return false; |
6591 | } | |
6592 | } | |
e440a328 | 6593 | break; |
6594 | ||
6595 | case OPERATOR_LT: | |
6596 | case OPERATOR_LE: | |
6597 | case OPERATOR_GT: | |
6598 | case OPERATOR_GE: | |
e9d3367e | 6599 | { |
6600 | std::string reason; | |
6601 | if (!Type::are_compatible_for_comparison(false, type, otype, &reason)) | |
6602 | { | |
631d5788 | 6603 | go_error_at(location, "%s", reason.c_str()); |
e9d3367e | 6604 | return false; |
6605 | } | |
6606 | } | |
e440a328 | 6607 | break; |
6608 | ||
6609 | case OPERATOR_PLUS: | |
6610 | case OPERATOR_PLUSEQ: | |
c999c2a7 | 6611 | if ((!type->is_numeric_type() && !type->is_string_type()) |
6612 | || (!otype->is_numeric_type() && !otype->is_string_type())) | |
e440a328 | 6613 | { |
631d5788 | 6614 | go_error_at(location, |
e440a328 | 6615 | "expected integer, floating, complex, or string type"); |
6616 | return false; | |
6617 | } | |
6618 | break; | |
6619 | ||
6620 | case OPERATOR_MINUS: | |
6621 | case OPERATOR_MINUSEQ: | |
6622 | case OPERATOR_MULT: | |
6623 | case OPERATOR_MULTEQ: | |
6624 | case OPERATOR_DIV: | |
6625 | case OPERATOR_DIVEQ: | |
c999c2a7 | 6626 | if (!type->is_numeric_type() || !otype->is_numeric_type()) |
e440a328 | 6627 | { |
631d5788 | 6628 | go_error_at(location, "expected integer, floating, or complex type"); |
e440a328 | 6629 | return false; |
6630 | } | |
6631 | break; | |
6632 | ||
6633 | case OPERATOR_MOD: | |
6634 | case OPERATOR_MODEQ: | |
6635 | case OPERATOR_OR: | |
6636 | case OPERATOR_OREQ: | |
6637 | case OPERATOR_AND: | |
6638 | case OPERATOR_ANDEQ: | |
6639 | case OPERATOR_XOR: | |
6640 | case OPERATOR_XOREQ: | |
6641 | case OPERATOR_BITCLEAR: | |
6642 | case OPERATOR_BITCLEAREQ: | |
c999c2a7 | 6643 | if (type->integer_type() == NULL || otype->integer_type() == NULL) |
e440a328 | 6644 | { |
631d5788 | 6645 | go_error_at(location, "expected integer type"); |
e440a328 | 6646 | return false; |
6647 | } | |
6648 | break; | |
6649 | ||
6650 | default: | |
c3e6f413 | 6651 | go_unreachable(); |
e440a328 | 6652 | } |
6653 | ||
6654 | return true; | |
6655 | } | |
6656 | ||
6657 | // Check types. | |
6658 | ||
6659 | void | |
6660 | Binary_expression::do_check_types(Gogo*) | |
6661 | { | |
5f5fea79 | 6662 | if (this->classification() == EXPRESSION_ERROR) |
6663 | return; | |
6664 | ||
e440a328 | 6665 | Type* left_type = this->left_->type(); |
6666 | Type* right_type = this->right_->type(); | |
5c13bd80 | 6667 | if (left_type->is_error() || right_type->is_error()) |
9fe897ef | 6668 | { |
6669 | this->set_is_error(); | |
6670 | return; | |
6671 | } | |
e440a328 | 6672 | |
6673 | if (this->op_ == OPERATOR_EQEQ | |
6674 | || this->op_ == OPERATOR_NOTEQ | |
6675 | || this->op_ == OPERATOR_LT | |
6676 | || this->op_ == OPERATOR_LE | |
6677 | || this->op_ == OPERATOR_GT | |
6678 | || this->op_ == OPERATOR_GE) | |
6679 | { | |
907c5ecd | 6680 | if (left_type->is_nil_type() && right_type->is_nil_type()) |
6681 | { | |
6682 | this->report_error(_("invalid comparison of nil with nil")); | |
6683 | return; | |
6684 | } | |
e440a328 | 6685 | if (!Type::are_assignable(left_type, right_type, NULL) |
6686 | && !Type::are_assignable(right_type, left_type, NULL)) | |
6687 | { | |
6688 | this->report_error(_("incompatible types in binary expression")); | |
6689 | return; | |
6690 | } | |
6691 | if (!Binary_expression::check_operator_type(this->op_, left_type, | |
be8b5eee | 6692 | right_type, |
e440a328 | 6693 | this->location()) |
6694 | || !Binary_expression::check_operator_type(this->op_, right_type, | |
be8b5eee | 6695 | left_type, |
e440a328 | 6696 | this->location())) |
6697 | { | |
6698 | this->set_is_error(); | |
6699 | return; | |
6700 | } | |
6701 | } | |
6702 | else if (this->op_ != OPERATOR_LSHIFT && this->op_ != OPERATOR_RSHIFT) | |
6703 | { | |
6704 | if (!Type::are_compatible_for_binop(left_type, right_type)) | |
6705 | { | |
6706 | this->report_error(_("incompatible types in binary expression")); | |
6707 | return; | |
6708 | } | |
6709 | if (!Binary_expression::check_operator_type(this->op_, left_type, | |
be8b5eee | 6710 | right_type, |
e440a328 | 6711 | this->location())) |
6712 | { | |
6713 | this->set_is_error(); | |
6714 | return; | |
6715 | } | |
5c65b19d | 6716 | if (this->op_ == OPERATOR_DIV || this->op_ == OPERATOR_MOD) |
6717 | { | |
6718 | // Division by a zero integer constant is an error. | |
6719 | Numeric_constant rconst; | |
6720 | unsigned long rval; | |
6721 | if (left_type->integer_type() != NULL | |
6722 | && this->right_->numeric_constant_value(&rconst) | |
6723 | && rconst.to_unsigned_long(&rval) == Numeric_constant::NC_UL_VALID | |
6724 | && rval == 0) | |
6725 | { | |
6726 | this->report_error(_("integer division by zero")); | |
6727 | return; | |
6728 | } | |
6729 | } | |
e440a328 | 6730 | } |
6731 | else | |
6732 | { | |
6733 | if (left_type->integer_type() == NULL) | |
6734 | this->report_error(_("shift of non-integer operand")); | |
6735 | ||
6b5e0fac | 6736 | if (right_type->is_string_type()) |
16ac1e7c | 6737 | this->report_error(_("shift count not integer")); |
6b5e0fac | 6738 | else if (!right_type->is_abstract() |
16ac1e7c | 6739 | && right_type->integer_type() == NULL) |
6740 | this->report_error(_("shift count not integer")); | |
e440a328 | 6741 | else |
6742 | { | |
0c77715b | 6743 | Numeric_constant nc; |
6744 | if (this->right_->numeric_constant_value(&nc)) | |
e440a328 | 6745 | { |
0c77715b | 6746 | mpz_t val; |
6747 | if (!nc.to_int(&val)) | |
16ac1e7c | 6748 | this->report_error(_("shift count not integer")); |
0c77715b | 6749 | else |
a4eba91b | 6750 | { |
0c77715b | 6751 | if (mpz_sgn(val) < 0) |
6752 | { | |
6753 | this->report_error(_("negative shift count")); | |
0c77715b | 6754 | Location rloc = this->right_->location(); |
e67508fa | 6755 | this->right_ = Expression::make_integer_ul(0, right_type, |
6756 | rloc); | |
0c77715b | 6757 | } |
6758 | mpz_clear(val); | |
a4eba91b | 6759 | } |
e440a328 | 6760 | } |
e440a328 | 6761 | } |
6762 | } | |
6763 | } | |
6764 | ||
ea664253 | 6765 | // Get the backend representation for a binary expression. |
e440a328 | 6766 | |
ea664253 | 6767 | Bexpression* |
6768 | Binary_expression::do_get_backend(Translate_context* context) | |
e440a328 | 6769 | { |
1b1f2abf | 6770 | Gogo* gogo = context->gogo(); |
a32698ee | 6771 | Location loc = this->location(); |
6772 | Type* left_type = this->left_->type(); | |
6773 | Type* right_type = this->right_->type(); | |
1b1f2abf | 6774 | |
e440a328 | 6775 | bool use_left_type = true; |
6776 | bool is_shift_op = false; | |
29a2d1d8 | 6777 | bool is_idiv_op = false; |
e440a328 | 6778 | switch (this->op_) |
6779 | { | |
6780 | case OPERATOR_EQEQ: | |
6781 | case OPERATOR_NOTEQ: | |
6782 | case OPERATOR_LT: | |
6783 | case OPERATOR_LE: | |
6784 | case OPERATOR_GT: | |
6785 | case OPERATOR_GE: | |
ea664253 | 6786 | return Expression::comparison(context, this->type_, this->op_, |
6787 | this->left_, this->right_, loc); | |
e440a328 | 6788 | |
6789 | case OPERATOR_OROR: | |
e440a328 | 6790 | case OPERATOR_ANDAND: |
e440a328 | 6791 | use_left_type = false; |
6792 | break; | |
6793 | case OPERATOR_PLUS: | |
e440a328 | 6794 | case OPERATOR_MINUS: |
e440a328 | 6795 | case OPERATOR_OR: |
e440a328 | 6796 | case OPERATOR_XOR: |
e440a328 | 6797 | case OPERATOR_MULT: |
e440a328 | 6798 | break; |
6799 | case OPERATOR_DIV: | |
a32698ee | 6800 | if (left_type->float_type() != NULL || left_type->complex_type() != NULL) |
6801 | break; | |
729f8831 | 6802 | // Fall through. |
e440a328 | 6803 | case OPERATOR_MOD: |
29a2d1d8 | 6804 | is_idiv_op = true; |
e440a328 | 6805 | break; |
6806 | case OPERATOR_LSHIFT: | |
e440a328 | 6807 | case OPERATOR_RSHIFT: |
e440a328 | 6808 | is_shift_op = true; |
6809 | break; | |
e440a328 | 6810 | case OPERATOR_BITCLEAR: |
a32698ee | 6811 | this->right_ = Expression::make_unary(OPERATOR_XOR, this->right_, loc); |
6812 | case OPERATOR_AND: | |
e440a328 | 6813 | break; |
6814 | default: | |
c3e6f413 | 6815 | go_unreachable(); |
e440a328 | 6816 | } |
6817 | ||
736a16ba | 6818 | // The only binary operation for string is +, and that should have |
6819 | // been converted to a String_concat_expression in do_lower. | |
6820 | go_assert(!left_type->is_string_type()); | |
a32698ee | 6821 | |
6822 | // For complex division Go might want slightly different results than the | |
6823 | // backend implementation provides, so we have our own runtime routine. | |
1850e20c | 6824 | if (this->op_ == OPERATOR_DIV && this->left_->type()->complex_type() != NULL) |
6825 | { | |
a32698ee | 6826 | Runtime::Function complex_code; |
1850e20c | 6827 | switch (this->left_->type()->complex_type()->bits()) |
6828 | { | |
6829 | case 64: | |
a32698ee | 6830 | complex_code = Runtime::COMPLEX64_DIV; |
1850e20c | 6831 | break; |
6832 | case 128: | |
a32698ee | 6833 | complex_code = Runtime::COMPLEX128_DIV; |
1850e20c | 6834 | break; |
6835 | default: | |
6836 | go_unreachable(); | |
6837 | } | |
a32698ee | 6838 | Expression* complex_div = |
6839 | Runtime::make_call(complex_code, loc, 2, this->left_, this->right_); | |
ea664253 | 6840 | return complex_div->get_backend(context); |
1850e20c | 6841 | } |
6842 | ||
ea664253 | 6843 | Bexpression* left = this->left_->get_backend(context); |
6844 | Bexpression* right = this->right_->get_backend(context); | |
e440a328 | 6845 | |
a32698ee | 6846 | Type* type = use_left_type ? left_type : right_type; |
6847 | Btype* btype = type->get_backend(gogo); | |
6848 | ||
6849 | Bexpression* ret = | |
6850 | gogo->backend()->binary_expression(this->op_, left, right, loc); | |
6851 | ret = gogo->backend()->convert_expression(btype, ret, loc); | |
e440a328 | 6852 | |
a32698ee | 6853 | // Initialize overflow constants. |
6854 | Bexpression* overflow; | |
6855 | mpz_t zero; | |
6856 | mpz_init_set_ui(zero, 0UL); | |
6857 | mpz_t one; | |
6858 | mpz_init_set_ui(one, 1UL); | |
6859 | mpz_t neg_one; | |
6860 | mpz_init_set_si(neg_one, -1); | |
e440a328 | 6861 | |
a32698ee | 6862 | Btype* left_btype = left_type->get_backend(gogo); |
6863 | Btype* right_btype = right_type->get_backend(gogo); | |
e440a328 | 6864 | |
6865 | // In Go, a shift larger than the size of the type is well-defined. | |
a32698ee | 6866 | // This is not true in C, so we need to insert a conditional. |
16ac1e7c | 6867 | // We also need to check for a negative shift count. |
e440a328 | 6868 | if (is_shift_op) |
6869 | { | |
a32698ee | 6870 | go_assert(left_type->integer_type() != NULL); |
16ac1e7c | 6871 | go_assert(right_type->integer_type() != NULL); |
e440a328 | 6872 | |
a32698ee | 6873 | int bits = left_type->integer_type()->bits(); |
a7c5b619 | 6874 | |
6875 | Numeric_constant nc; | |
6876 | unsigned long ul; | |
6877 | if (!this->right_->numeric_constant_value(&nc) | |
6878 | || nc.to_unsigned_long(&ul) != Numeric_constant::NC_UL_VALID | |
6879 | || ul >= static_cast<unsigned long>(bits)) | |
e440a328 | 6880 | { |
a7c5b619 | 6881 | mpz_t bitsval; |
6882 | mpz_init_set_ui(bitsval, bits); | |
6883 | Bexpression* bits_expr = | |
6884 | gogo->backend()->integer_constant_expression(right_btype, bitsval); | |
6885 | Bexpression* compare = | |
6886 | gogo->backend()->binary_expression(OPERATOR_LT, | |
6887 | right, bits_expr, loc); | |
6888 | ||
6889 | Bexpression* zero_expr = | |
6890 | gogo->backend()->integer_constant_expression(left_btype, zero); | |
6891 | overflow = zero_expr; | |
6892 | Bfunction* bfn = context->function()->func_value()->get_decl(); | |
6893 | if (this->op_ == OPERATOR_RSHIFT | |
6894 | && !left_type->integer_type()->is_unsigned()) | |
6895 | { | |
6896 | Bexpression* neg_expr = | |
6897 | gogo->backend()->binary_expression(OPERATOR_LT, left, | |
6898 | zero_expr, loc); | |
6899 | Bexpression* neg_one_expr = | |
6900 | gogo->backend()->integer_constant_expression(left_btype, | |
6901 | neg_one); | |
6902 | overflow = gogo->backend()->conditional_expression(bfn, | |
6903 | btype, | |
6904 | neg_expr, | |
6905 | neg_one_expr, | |
6906 | zero_expr, | |
6907 | loc); | |
6908 | } | |
6909 | ret = gogo->backend()->conditional_expression(bfn, btype, compare, | |
6910 | ret, overflow, loc); | |
6911 | mpz_clear(bitsval); | |
29a2d1d8 | 6912 | } |
16ac1e7c | 6913 | |
6914 | if (!right_type->integer_type()->is_unsigned() | |
6915 | && (!this->right_->numeric_constant_value(&nc) | |
6916 | || nc.to_unsigned_long(&ul) != Numeric_constant::NC_UL_VALID)) | |
6917 | { | |
6918 | Bexpression* zero_expr = | |
6919 | gogo->backend()->integer_constant_expression(right_btype, zero); | |
6920 | Bexpression* compare = | |
6921 | gogo->backend()->binary_expression(OPERATOR_LT, right, zero_expr, | |
6922 | loc); | |
6923 | const int errcode = RUNTIME_ERROR_SHIFT_BY_NEGATIVE; | |
6924 | Bexpression* crash = | |
6925 | gogo->runtime_error(errcode, loc)->get_backend(context); | |
6926 | Bfunction* bfn = context->function()->func_value()->get_decl(); | |
6927 | ret = gogo->backend()->conditional_expression(bfn, btype, compare, | |
6928 | crash, ret, loc); | |
6929 | } | |
29a2d1d8 | 6930 | } |
6931 | ||
6932 | // Add checks for division by zero and division overflow as needed. | |
6933 | if (is_idiv_op) | |
6934 | { | |
5c3f3470 | 6935 | if (gogo->check_divide_by_zero()) |
29a2d1d8 | 6936 | { |
6937 | // right == 0 | |
a32698ee | 6938 | Bexpression* zero_expr = |
6939 | gogo->backend()->integer_constant_expression(right_btype, zero); | |
6940 | Bexpression* check = | |
6941 | gogo->backend()->binary_expression(OPERATOR_EQEQ, | |
6942 | right, zero_expr, loc); | |
29a2d1d8 | 6943 | |
a32698ee | 6944 | // __go_runtime_error(RUNTIME_ERROR_DIVISION_BY_ZERO) |
29a2d1d8 | 6945 | int errcode = RUNTIME_ERROR_DIVISION_BY_ZERO; |
ea664253 | 6946 | Bexpression* crash = gogo->runtime_error(errcode, |
6947 | loc)->get_backend(context); | |
29a2d1d8 | 6948 | |
6949 | // right == 0 ? (__go_runtime_error(...), 0) : ret | |
93715b75 | 6950 | Bfunction* bfn = context->function()->func_value()->get_decl(); |
6951 | ret = gogo->backend()->conditional_expression(bfn, btype, | |
6952 | check, crash, | |
ea664253 | 6953 | ret, loc); |
b13c66cd | 6954 | } |
6955 | ||
5c3f3470 | 6956 | if (gogo->check_divide_overflow()) |
29a2d1d8 | 6957 | { |
6958 | // right == -1 | |
6959 | // FIXME: It would be nice to say that this test is expected | |
6960 | // to return false. | |
a32698ee | 6961 | |
6962 | Bexpression* neg_one_expr = | |
6963 | gogo->backend()->integer_constant_expression(right_btype, neg_one); | |
6964 | Bexpression* check = | |
6965 | gogo->backend()->binary_expression(OPERATOR_EQEQ, | |
6966 | right, neg_one_expr, loc); | |
6967 | ||
6968 | Bexpression* zero_expr = | |
6969 | gogo->backend()->integer_constant_expression(btype, zero); | |
6970 | Bexpression* one_expr = | |
6971 | gogo->backend()->integer_constant_expression(btype, one); | |
93715b75 | 6972 | Bfunction* bfn = context->function()->func_value()->get_decl(); |
a32698ee | 6973 | |
6974 | if (type->integer_type()->is_unsigned()) | |
29a2d1d8 | 6975 | { |
6976 | // An unsigned -1 is the largest possible number, so | |
6977 | // dividing is always 1 or 0. | |
a32698ee | 6978 | |
6979 | Bexpression* cmp = | |
6980 | gogo->backend()->binary_expression(OPERATOR_EQEQ, | |
6981 | left, right, loc); | |
29a2d1d8 | 6982 | if (this->op_ == OPERATOR_DIV) |
a32698ee | 6983 | overflow = |
93715b75 | 6984 | gogo->backend()->conditional_expression(bfn, btype, cmp, |
a32698ee | 6985 | one_expr, zero_expr, |
6986 | loc); | |
29a2d1d8 | 6987 | else |
a32698ee | 6988 | overflow = |
93715b75 | 6989 | gogo->backend()->conditional_expression(bfn, btype, cmp, |
a32698ee | 6990 | zero_expr, left, |
6991 | loc); | |
29a2d1d8 | 6992 | } |
6993 | else | |
6994 | { | |
6995 | // Computing left / -1 is the same as computing - left, | |
6996 | // which does not overflow since Go sets -fwrapv. | |
6997 | if (this->op_ == OPERATOR_DIV) | |
a32698ee | 6998 | { |
6999 | Expression* negate_expr = | |
7000 | Expression::make_unary(OPERATOR_MINUS, this->left_, loc); | |
ea664253 | 7001 | overflow = negate_expr->get_backend(context); |
a32698ee | 7002 | } |
29a2d1d8 | 7003 | else |
a32698ee | 7004 | overflow = zero_expr; |
29a2d1d8 | 7005 | } |
a32698ee | 7006 | overflow = gogo->backend()->convert_expression(btype, overflow, loc); |
29a2d1d8 | 7007 | |
7008 | // right == -1 ? - left : ret | |
93715b75 | 7009 | ret = gogo->backend()->conditional_expression(bfn, btype, |
7010 | check, overflow, | |
a32698ee | 7011 | ret, loc); |
29a2d1d8 | 7012 | } |
e440a328 | 7013 | } |
7014 | ||
a32698ee | 7015 | mpz_clear(zero); |
7016 | mpz_clear(one); | |
7017 | mpz_clear(neg_one); | |
ea664253 | 7018 | return ret; |
e440a328 | 7019 | } |
7020 | ||
7021 | // Export a binary expression. | |
7022 | ||
7023 | void | |
548be246 | 7024 | Binary_expression::do_export(Export_function_body* efb) const |
e440a328 | 7025 | { |
548be246 | 7026 | efb->write_c_string("("); |
7027 | this->left_->export_expression(efb); | |
e440a328 | 7028 | switch (this->op_) |
7029 | { | |
7030 | case OPERATOR_OROR: | |
548be246 | 7031 | efb->write_c_string(" || "); |
e440a328 | 7032 | break; |
7033 | case OPERATOR_ANDAND: | |
548be246 | 7034 | efb->write_c_string(" && "); |
e440a328 | 7035 | break; |
7036 | case OPERATOR_EQEQ: | |
548be246 | 7037 | efb->write_c_string(" == "); |
e440a328 | 7038 | break; |
7039 | case OPERATOR_NOTEQ: | |
548be246 | 7040 | efb->write_c_string(" != "); |
e440a328 | 7041 | break; |
7042 | case OPERATOR_LT: | |
548be246 | 7043 | efb->write_c_string(" < "); |
e440a328 | 7044 | break; |
7045 | case OPERATOR_LE: | |
548be246 | 7046 | efb->write_c_string(" <= "); |
e440a328 | 7047 | break; |
7048 | case OPERATOR_GT: | |
548be246 | 7049 | efb->write_c_string(" > "); |
e440a328 | 7050 | break; |
7051 | case OPERATOR_GE: | |
548be246 | 7052 | efb->write_c_string(" >= "); |
e440a328 | 7053 | break; |
7054 | case OPERATOR_PLUS: | |
548be246 | 7055 | efb->write_c_string(" + "); |
e440a328 | 7056 | break; |
7057 | case OPERATOR_MINUS: | |
548be246 | 7058 | efb->write_c_string(" - "); |
e440a328 | 7059 | break; |
7060 | case OPERATOR_OR: | |
548be246 | 7061 | efb->write_c_string(" | "); |
e440a328 | 7062 | break; |
7063 | case OPERATOR_XOR: | |
548be246 | 7064 | efb->write_c_string(" ^ "); |
e440a328 | 7065 | break; |
7066 | case OPERATOR_MULT: | |
548be246 | 7067 | efb->write_c_string(" * "); |
e440a328 | 7068 | break; |
7069 | case OPERATOR_DIV: | |
548be246 | 7070 | efb->write_c_string(" / "); |
e440a328 | 7071 | break; |
7072 | case OPERATOR_MOD: | |
548be246 | 7073 | efb->write_c_string(" % "); |
e440a328 | 7074 | break; |
7075 | case OPERATOR_LSHIFT: | |
548be246 | 7076 | efb->write_c_string(" << "); |
e440a328 | 7077 | break; |
7078 | case OPERATOR_RSHIFT: | |
548be246 | 7079 | efb->write_c_string(" >> "); |
e440a328 | 7080 | break; |
7081 | case OPERATOR_AND: | |
548be246 | 7082 | efb->write_c_string(" & "); |
e440a328 | 7083 | break; |
7084 | case OPERATOR_BITCLEAR: | |
548be246 | 7085 | efb->write_c_string(" &^ "); |
e440a328 | 7086 | break; |
7087 | default: | |
c3e6f413 | 7088 | go_unreachable(); |
e440a328 | 7089 | } |
548be246 | 7090 | this->right_->export_expression(efb); |
7091 | efb->write_c_string(")"); | |
e440a328 | 7092 | } |
7093 | ||
7094 | // Import a binary expression. | |
7095 | ||
7096 | Expression* | |
bc8e2ef4 | 7097 | Binary_expression::do_import(Import_expression* imp, Location loc) |
e440a328 | 7098 | { |
7099 | imp->require_c_string("("); | |
7100 | ||
9b92780c | 7101 | Expression* left = Expression::import_expression(imp, loc); |
e440a328 | 7102 | |
7103 | Operator op; | |
7104 | if (imp->match_c_string(" || ")) | |
7105 | { | |
7106 | op = OPERATOR_OROR; | |
7107 | imp->advance(4); | |
7108 | } | |
7109 | else if (imp->match_c_string(" && ")) | |
7110 | { | |
7111 | op = OPERATOR_ANDAND; | |
7112 | imp->advance(4); | |
7113 | } | |
7114 | else if (imp->match_c_string(" == ")) | |
7115 | { | |
7116 | op = OPERATOR_EQEQ; | |
7117 | imp->advance(4); | |
7118 | } | |
7119 | else if (imp->match_c_string(" != ")) | |
7120 | { | |
7121 | op = OPERATOR_NOTEQ; | |
7122 | imp->advance(4); | |
7123 | } | |
7124 | else if (imp->match_c_string(" < ")) | |
7125 | { | |
7126 | op = OPERATOR_LT; | |
7127 | imp->advance(3); | |
7128 | } | |
7129 | else if (imp->match_c_string(" <= ")) | |
7130 | { | |
7131 | op = OPERATOR_LE; | |
7132 | imp->advance(4); | |
7133 | } | |
7134 | else if (imp->match_c_string(" > ")) | |
7135 | { | |
7136 | op = OPERATOR_GT; | |
7137 | imp->advance(3); | |
7138 | } | |
7139 | else if (imp->match_c_string(" >= ")) | |
7140 | { | |
7141 | op = OPERATOR_GE; | |
7142 | imp->advance(4); | |
7143 | } | |
7144 | else if (imp->match_c_string(" + ")) | |
7145 | { | |
7146 | op = OPERATOR_PLUS; | |
7147 | imp->advance(3); | |
7148 | } | |
7149 | else if (imp->match_c_string(" - ")) | |
7150 | { | |
7151 | op = OPERATOR_MINUS; | |
7152 | imp->advance(3); | |
7153 | } | |
7154 | else if (imp->match_c_string(" | ")) | |
7155 | { | |
7156 | op = OPERATOR_OR; | |
7157 | imp->advance(3); | |
7158 | } | |
7159 | else if (imp->match_c_string(" ^ ")) | |
7160 | { | |
7161 | op = OPERATOR_XOR; | |
7162 | imp->advance(3); | |
7163 | } | |
7164 | else if (imp->match_c_string(" * ")) | |
7165 | { | |
7166 | op = OPERATOR_MULT; | |
7167 | imp->advance(3); | |
7168 | } | |
7169 | else if (imp->match_c_string(" / ")) | |
7170 | { | |
7171 | op = OPERATOR_DIV; | |
7172 | imp->advance(3); | |
7173 | } | |
7174 | else if (imp->match_c_string(" % ")) | |
7175 | { | |
7176 | op = OPERATOR_MOD; | |
7177 | imp->advance(3); | |
7178 | } | |
7179 | else if (imp->match_c_string(" << ")) | |
7180 | { | |
7181 | op = OPERATOR_LSHIFT; | |
7182 | imp->advance(4); | |
7183 | } | |
7184 | else if (imp->match_c_string(" >> ")) | |
7185 | { | |
7186 | op = OPERATOR_RSHIFT; | |
7187 | imp->advance(4); | |
7188 | } | |
7189 | else if (imp->match_c_string(" & ")) | |
7190 | { | |
7191 | op = OPERATOR_AND; | |
7192 | imp->advance(3); | |
7193 | } | |
7194 | else if (imp->match_c_string(" &^ ")) | |
7195 | { | |
7196 | op = OPERATOR_BITCLEAR; | |
7197 | imp->advance(4); | |
7198 | } | |
171fd404 | 7199 | else if (imp->match_c_string(")")) |
7200 | { | |
7201 | // Not a binary operator after all. | |
7202 | imp->advance(1); | |
7203 | return left; | |
7204 | } | |
e440a328 | 7205 | else |
7206 | { | |
631d5788 | 7207 | go_error_at(imp->location(), "unrecognized binary operator"); |
9b92780c | 7208 | return Expression::make_error(loc); |
e440a328 | 7209 | } |
7210 | ||
9b92780c | 7211 | Expression* right = Expression::import_expression(imp, loc); |
e440a328 | 7212 | |
7213 | imp->require_c_string(")"); | |
7214 | ||
9b92780c | 7215 | return Expression::make_binary(op, left, right, loc); |
e440a328 | 7216 | } |
7217 | ||
d751bb78 | 7218 | // Dump ast representation of a binary expression. |
7219 | ||
7220 | void | |
7221 | Binary_expression::do_dump_expression(Ast_dump_context* ast_dump_context) const | |
7222 | { | |
7223 | ast_dump_context->ostream() << "("; | |
7224 | ast_dump_context->dump_expression(this->left_); | |
7225 | ast_dump_context->ostream() << " "; | |
7226 | ast_dump_context->dump_operator(this->op_); | |
7227 | ast_dump_context->ostream() << " "; | |
7228 | ast_dump_context->dump_expression(this->right_); | |
7229 | ast_dump_context->ostream() << ") "; | |
7230 | } | |
7231 | ||
e440a328 | 7232 | // Make a binary expression. |
7233 | ||
7234 | Expression* | |
7235 | Expression::make_binary(Operator op, Expression* left, Expression* right, | |
b13c66cd | 7236 | Location location) |
e440a328 | 7237 | { |
7238 | return new Binary_expression(op, left, right, location); | |
7239 | } | |
7240 | ||
7241 | // Implement a comparison. | |
7242 | ||
a32698ee | 7243 | Bexpression* |
7244 | Expression::comparison(Translate_context* context, Type* result_type, | |
7245 | Operator op, Expression* left, Expression* right, | |
7246 | Location location) | |
e440a328 | 7247 | { |
2387f644 | 7248 | Type* left_type = left->type(); |
7249 | Type* right_type = right->type(); | |
ceeb12d7 | 7250 | |
e67508fa | 7251 | Expression* zexpr = Expression::make_integer_ul(0, NULL, location); |
1b1f2abf | 7252 | |
15c67ee2 | 7253 | if (left_type->is_string_type() && right_type->is_string_type()) |
e440a328 | 7254 | { |
aad830e6 | 7255 | go_assert(left->is_variable() || left->is_constant()); |
7256 | go_assert(right->is_variable() || right->is_constant()); | |
ae77af58 | 7257 | |
6098d6cb | 7258 | if (op == OPERATOR_EQEQ || op == OPERATOR_NOTEQ) |
7259 | { | |
aad830e6 | 7260 | // (l.len == r.len |
7261 | // ? (l.ptr == r.ptr ? true : memcmp(l.ptr, r.ptr, r.len) == 0) | |
7262 | // : false) | |
7263 | Expression* llen = Expression::make_string_info(left, | |
7264 | STRING_INFO_LENGTH, | |
7265 | location); | |
7266 | Expression* rlen = Expression::make_string_info(right, | |
7267 | STRING_INFO_LENGTH, | |
7268 | location); | |
7269 | Expression* leneq = Expression::make_binary(OPERATOR_EQEQ, llen, rlen, | |
7270 | location); | |
7271 | Expression* lptr = Expression::make_string_info(left->copy(), | |
7272 | STRING_INFO_DATA, | |
7273 | location); | |
7274 | Expression* rptr = Expression::make_string_info(right->copy(), | |
7275 | STRING_INFO_DATA, | |
7276 | location); | |
7277 | Expression* ptreq = Expression::make_binary(OPERATOR_EQEQ, lptr, rptr, | |
7278 | location); | |
7279 | Expression* btrue = Expression::make_boolean(true, location); | |
7280 | Expression* call = Runtime::make_call(Runtime::MEMCMP, location, 3, | |
7281 | lptr->copy(), rptr->copy(), | |
7282 | rlen->copy()); | |
7283 | Type* int32_type = Type::lookup_integer_type("int32"); | |
7284 | Expression* zero = Expression::make_integer_ul(0, int32_type, location); | |
7285 | Expression* cmp = Expression::make_binary(OPERATOR_EQEQ, call, zero, | |
7286 | location); | |
7287 | Expression* cond = Expression::make_conditional(ptreq, btrue, cmp, | |
7288 | location); | |
7289 | Expression* bfalse = Expression::make_boolean(false, location); | |
7290 | left = Expression::make_conditional(leneq, cond, bfalse, location); | |
6098d6cb | 7291 | right = Expression::make_boolean(true, location); |
7292 | } | |
7293 | else | |
7294 | { | |
7295 | left = Runtime::make_call(Runtime::CMPSTRING, location, 2, | |
7296 | left, right); | |
7297 | right = zexpr; | |
7298 | } | |
e440a328 | 7299 | } |
15c67ee2 | 7300 | else if ((left_type->interface_type() != NULL |
7301 | && right_type->interface_type() == NULL | |
7302 | && !right_type->is_nil_type()) | |
7303 | || (left_type->interface_type() == NULL | |
7304 | && !left_type->is_nil_type() | |
7305 | && right_type->interface_type() != NULL)) | |
e440a328 | 7306 | { |
7307 | // Comparing an interface value to a non-interface value. | |
7308 | if (left_type->interface_type() == NULL) | |
7309 | { | |
7310 | std::swap(left_type, right_type); | |
2387f644 | 7311 | std::swap(left, right); |
e440a328 | 7312 | } |
7313 | ||
7314 | // The right operand is not an interface. We need to take its | |
5b665222 | 7315 | // address if it is not a direct interface type. |
ceeb12d7 | 7316 | Expression* pointer_arg = NULL; |
5b665222 | 7317 | if (right_type->is_direct_iface_type()) |
7318 | pointer_arg = Expression::unpack_direct_iface(right, location); | |
e440a328 | 7319 | else |
7320 | { | |
2387f644 | 7321 | go_assert(right->is_addressable()); |
7322 | pointer_arg = Expression::make_unary(OPERATOR_AND, right, | |
ceeb12d7 | 7323 | location); |
e440a328 | 7324 | } |
e440a328 | 7325 | |
2387f644 | 7326 | Expression* descriptor = |
7327 | Expression::make_type_descriptor(right_type, location); | |
7328 | left = | |
ceeb12d7 | 7329 | Runtime::make_call((left_type->interface_type()->is_empty() |
6098d6cb | 7330 | ? Runtime::EFACEVALEQ |
7331 | : Runtime::IFACEVALEQ), | |
2387f644 | 7332 | location, 3, left, descriptor, |
ceeb12d7 | 7333 | pointer_arg); |
6098d6cb | 7334 | go_assert(op == OPERATOR_EQEQ || op == OPERATOR_NOTEQ); |
7335 | right = Expression::make_boolean(true, location); | |
e440a328 | 7336 | } |
7337 | else if (left_type->interface_type() != NULL | |
7338 | && right_type->interface_type() != NULL) | |
7339 | { | |
ceeb12d7 | 7340 | Runtime::Function compare_function; |
739bad04 | 7341 | if (left_type->interface_type()->is_empty() |
7342 | && right_type->interface_type()->is_empty()) | |
6098d6cb | 7343 | compare_function = Runtime::EFACEEQ; |
739bad04 | 7344 | else if (!left_type->interface_type()->is_empty() |
7345 | && !right_type->interface_type()->is_empty()) | |
6098d6cb | 7346 | compare_function = Runtime::IFACEEQ; |
739bad04 | 7347 | else |
7348 | { | |
7349 | if (left_type->interface_type()->is_empty()) | |
7350 | { | |
739bad04 | 7351 | std::swap(left_type, right_type); |
2387f644 | 7352 | std::swap(left, right); |
739bad04 | 7353 | } |
c484d925 | 7354 | go_assert(!left_type->interface_type()->is_empty()); |
7355 | go_assert(right_type->interface_type()->is_empty()); | |
6098d6cb | 7356 | compare_function = Runtime::IFACEEFACEEQ; |
739bad04 | 7357 | } |
7358 | ||
2387f644 | 7359 | left = Runtime::make_call(compare_function, location, 2, left, right); |
6098d6cb | 7360 | go_assert(op == OPERATOR_EQEQ || op == OPERATOR_NOTEQ); |
7361 | right = Expression::make_boolean(true, location); | |
e440a328 | 7362 | } |
7363 | ||
7364 | if (left_type->is_nil_type() | |
7365 | && (op == OPERATOR_EQEQ || op == OPERATOR_NOTEQ)) | |
7366 | { | |
7367 | std::swap(left_type, right_type); | |
2387f644 | 7368 | std::swap(left, right); |
e440a328 | 7369 | } |
7370 | ||
7371 | if (right_type->is_nil_type()) | |
7372 | { | |
2387f644 | 7373 | right = Expression::make_nil(location); |
e440a328 | 7374 | if (left_type->array_type() != NULL |
7375 | && left_type->array_type()->length() == NULL) | |
7376 | { | |
7377 | Array_type* at = left_type->array_type(); | |
44dbe1d7 | 7378 | bool is_lvalue = false; |
7379 | left = at->get_value_pointer(context->gogo(), left, is_lvalue); | |
e440a328 | 7380 | } |
7381 | else if (left_type->interface_type() != NULL) | |
7382 | { | |
7383 | // An interface is nil if the first field is nil. | |
2387f644 | 7384 | left = Expression::make_field_reference(left, 0, location); |
e440a328 | 7385 | } |
7386 | } | |
7387 | ||
ea664253 | 7388 | Bexpression* left_bexpr = left->get_backend(context); |
7389 | Bexpression* right_bexpr = right->get_backend(context); | |
e90c9dfc | 7390 | |
a32698ee | 7391 | Gogo* gogo = context->gogo(); |
7392 | Bexpression* ret = gogo->backend()->binary_expression(op, left_bexpr, | |
7393 | right_bexpr, location); | |
7394 | if (result_type != NULL) | |
7395 | ret = gogo->backend()->convert_expression(result_type->get_backend(gogo), | |
7396 | ret, location); | |
e440a328 | 7397 | return ret; |
7398 | } | |
7399 | ||
736a16ba | 7400 | // Class String_concat_expression. |
7401 | ||
7402 | bool | |
7403 | String_concat_expression::do_is_constant() const | |
7404 | { | |
7405 | for (Expression_list::const_iterator pe = this->exprs_->begin(); | |
7406 | pe != this->exprs_->end(); | |
7407 | ++pe) | |
7408 | { | |
7409 | if (!(*pe)->is_constant()) | |
7410 | return false; | |
7411 | } | |
7412 | return true; | |
7413 | } | |
7414 | ||
d2199dbc | 7415 | bool |
7416 | String_concat_expression::do_is_zero_value() const | |
7417 | { | |
7418 | for (Expression_list::const_iterator pe = this->exprs_->begin(); | |
7419 | pe != this->exprs_->end(); | |
7420 | ++pe) | |
7421 | { | |
7422 | if (!(*pe)->is_zero_value()) | |
7423 | return false; | |
7424 | } | |
7425 | return true; | |
7426 | } | |
7427 | ||
736a16ba | 7428 | bool |
3ae06f68 | 7429 | String_concat_expression::do_is_static_initializer() const |
736a16ba | 7430 | { |
7431 | for (Expression_list::const_iterator pe = this->exprs_->begin(); | |
7432 | pe != this->exprs_->end(); | |
7433 | ++pe) | |
7434 | { | |
3ae06f68 | 7435 | if (!(*pe)->is_static_initializer()) |
736a16ba | 7436 | return false; |
7437 | } | |
7438 | return true; | |
7439 | } | |
7440 | ||
7441 | Type* | |
7442 | String_concat_expression::do_type() | |
7443 | { | |
7444 | Type* t = this->exprs_->front()->type(); | |
7445 | Expression_list::iterator pe = this->exprs_->begin(); | |
7446 | ++pe; | |
7447 | for (; pe != this->exprs_->end(); ++pe) | |
7448 | { | |
7449 | Type* t1; | |
7450 | if (!Binary_expression::operation_type(OPERATOR_PLUS, t, | |
7451 | (*pe)->type(), | |
7452 | &t1)) | |
7453 | return Type::make_error_type(); | |
7454 | t = t1; | |
7455 | } | |
7456 | return t; | |
7457 | } | |
7458 | ||
7459 | void | |
7460 | String_concat_expression::do_determine_type(const Type_context* context) | |
7461 | { | |
7462 | Type_context subcontext(*context); | |
7463 | for (Expression_list::iterator pe = this->exprs_->begin(); | |
7464 | pe != this->exprs_->end(); | |
7465 | ++pe) | |
7466 | { | |
7467 | Type* t = (*pe)->type(); | |
7468 | if (!t->is_abstract()) | |
7469 | { | |
7470 | subcontext.type = t; | |
7471 | break; | |
7472 | } | |
7473 | } | |
7474 | if (subcontext.type == NULL) | |
7475 | subcontext.type = this->exprs_->front()->type(); | |
7476 | for (Expression_list::iterator pe = this->exprs_->begin(); | |
7477 | pe != this->exprs_->end(); | |
7478 | ++pe) | |
7479 | (*pe)->determine_type(&subcontext); | |
7480 | } | |
7481 | ||
7482 | void | |
7483 | String_concat_expression::do_check_types(Gogo*) | |
7484 | { | |
7485 | if (this->is_error_expression()) | |
7486 | return; | |
7487 | Type* t = this->exprs_->front()->type(); | |
7488 | if (t->is_error()) | |
7489 | { | |
7490 | this->set_is_error(); | |
7491 | return; | |
7492 | } | |
7493 | Expression_list::iterator pe = this->exprs_->begin(); | |
7494 | ++pe; | |
7495 | for (; pe != this->exprs_->end(); ++pe) | |
7496 | { | |
7497 | Type* t1 = (*pe)->type(); | |
7498 | if (!Type::are_compatible_for_binop(t, t1)) | |
7499 | { | |
7500 | this->report_error("incompatible types in binary expression"); | |
7501 | return; | |
7502 | } | |
7503 | if (!Binary_expression::check_operator_type(OPERATOR_PLUS, t, t1, | |
7504 | this->location())) | |
7505 | { | |
7506 | this->set_is_error(); | |
7507 | return; | |
7508 | } | |
7509 | } | |
7510 | } | |
7511 | ||
7512 | Expression* | |
7513 | String_concat_expression::do_flatten(Gogo*, Named_object*, | |
85c94669 | 7514 | Statement_inserter* inserter) |
736a16ba | 7515 | { |
7516 | if (this->is_error_expression()) | |
7517 | return this; | |
7518 | Location loc = this->location(); | |
7519 | Type* type = this->type(); | |
cb9d693f | 7520 | |
7521 | // Mark string([]byte) operands to reuse the backing store. | |
7522 | // runtime.concatstrings does not keep the reference. | |
7523 | // | |
7524 | // Note: in the gc runtime, if all but one inputs are empty, | |
7525 | // concatstrings returns the only nonempty input without copy. | |
7526 | // So it is not safe to reuse the backing store if it is a | |
7527 | // string([]byte) conversion. So the gc compiler does the | |
7528 | // no-copy optimization only when there is at least one | |
7529 | // constant nonempty input. Currently the gccgo runtime | |
7530 | // doesn't do this, so we don't do the check. | |
7531 | for (Expression_list::iterator p = this->exprs_->begin(); | |
7532 | p != this->exprs_->end(); | |
7533 | ++p) | |
7534 | { | |
7535 | Type_conversion_expression* tce = (*p)->conversion_expression(); | |
7536 | if (tce != NULL) | |
7537 | tce->set_no_copy(true); | |
7538 | } | |
7539 | ||
20a381c4 | 7540 | Expression* buf = NULL; |
7541 | Node* n = Node::make_node(this); | |
7542 | if ((n->encoding() & ESCAPE_MASK) == Node::ESCAPE_NONE) | |
7543 | { | |
7544 | size_t size = 0; | |
7545 | for (Expression_list::iterator p = this->exprs_->begin(); | |
7546 | p != this->exprs_->end(); | |
7547 | ++p) | |
7548 | { | |
7549 | std::string s; | |
7550 | if ((*p)->string_constant_value(&s)) | |
7551 | size += s.length(); | |
7552 | } | |
7553 | // Make a buffer on stack if the result does not escape. | |
7554 | // But don't do this if we know it won't fit. | |
7555 | if (size < (size_t)tmp_string_buf_size) | |
7556 | { | |
7557 | Type* byte_type = Type::lookup_integer_type("uint8"); | |
7558 | Expression* buflen = | |
7559 | Expression::make_integer_ul(tmp_string_buf_size, NULL, loc); | |
7560 | Expression::make_integer_ul(tmp_string_buf_size, NULL, loc); | |
7561 | Type* array_type = Type::make_array_type(byte_type, buflen); | |
7562 | buf = Expression::make_allocation(array_type, loc); | |
7563 | buf->allocation_expression()->set_allocate_on_stack(); | |
7564 | buf->allocation_expression()->set_no_zero(); | |
7565 | } | |
7566 | } | |
7567 | if (buf == NULL) | |
7568 | buf = Expression::make_nil(loc); | |
85c94669 | 7569 | go_assert(this->exprs_->size() > 1); |
7570 | Expression* len = | |
7571 | Expression::make_integer_ul(this->exprs_->size(), NULL, loc); | |
7572 | Array_type* array_type = Type::make_array_type(type, len); | |
7573 | array_type->set_is_array_incomparable(); | |
7574 | Expression* array = | |
7575 | Expression::make_array_composite_literal(array_type, this->exprs_, | |
7576 | loc); | |
7577 | Temporary_statement* ts = | |
7578 | Statement::make_temporary(array_type, array, loc); | |
7579 | inserter->insert(ts); | |
7580 | Expression* ref = Expression::make_temporary_reference(ts, loc); | |
7581 | ref = Expression::make_unary(OPERATOR_AND, ref, loc); | |
7582 | Expression* call = | |
7583 | Runtime::make_call(Runtime::CONCATSTRINGS, loc, 3, buf, | |
7584 | ref, len->copy()); | |
736a16ba | 7585 | return Expression::make_cast(type, call, loc); |
7586 | } | |
7587 | ||
7588 | void | |
7589 | String_concat_expression::do_dump_expression( | |
7590 | Ast_dump_context* ast_dump_context) const | |
7591 | { | |
7592 | ast_dump_context->ostream() << "concat("; | |
7593 | ast_dump_context->dump_expression_list(this->exprs_, false); | |
7594 | ast_dump_context->ostream() << ")"; | |
7595 | } | |
7596 | ||
7597 | Expression* | |
7598 | Expression::make_string_concat(Expression_list* exprs) | |
7599 | { | |
7600 | return new String_concat_expression(exprs); | |
7601 | } | |
7602 | ||
e440a328 | 7603 | // Class Bound_method_expression. |
7604 | ||
7605 | // Traversal. | |
7606 | ||
7607 | int | |
7608 | Bound_method_expression::do_traverse(Traverse* traverse) | |
7609 | { | |
e0659c9e | 7610 | return Expression::traverse(&this->expr_, traverse); |
e440a328 | 7611 | } |
7612 | ||
7613 | // Return the type of a bound method expression. The type of this | |
0afbb937 | 7614 | // object is simply the type of the method with no receiver. |
e440a328 | 7615 | |
7616 | Type* | |
7617 | Bound_method_expression::do_type() | |
7618 | { | |
0afbb937 | 7619 | Named_object* fn = this->method_->named_object(); |
7620 | Function_type* fntype; | |
7621 | if (fn->is_function()) | |
7622 | fntype = fn->func_value()->type(); | |
7623 | else if (fn->is_function_declaration()) | |
7624 | fntype = fn->func_declaration_value()->type(); | |
e0659c9e | 7625 | else |
7626 | return Type::make_error_type(); | |
0afbb937 | 7627 | return fntype->copy_without_receiver(); |
e440a328 | 7628 | } |
7629 | ||
7630 | // Determine the types of a method expression. | |
7631 | ||
7632 | void | |
7633 | Bound_method_expression::do_determine_type(const Type_context*) | |
7634 | { | |
0afbb937 | 7635 | Named_object* fn = this->method_->named_object(); |
7636 | Function_type* fntype; | |
7637 | if (fn->is_function()) | |
7638 | fntype = fn->func_value()->type(); | |
7639 | else if (fn->is_function_declaration()) | |
7640 | fntype = fn->func_declaration_value()->type(); | |
7641 | else | |
7642 | fntype = NULL; | |
e440a328 | 7643 | if (fntype == NULL || !fntype->is_method()) |
7644 | this->expr_->determine_type_no_context(); | |
7645 | else | |
7646 | { | |
7647 | Type_context subcontext(fntype->receiver()->type(), false); | |
7648 | this->expr_->determine_type(&subcontext); | |
7649 | } | |
7650 | } | |
7651 | ||
7652 | // Check the types of a method expression. | |
7653 | ||
7654 | void | |
7655 | Bound_method_expression::do_check_types(Gogo*) | |
7656 | { | |
0afbb937 | 7657 | Named_object* fn = this->method_->named_object(); |
7658 | if (!fn->is_function() && !fn->is_function_declaration()) | |
7659 | { | |
7660 | this->report_error(_("object is not a method")); | |
7661 | return; | |
7662 | } | |
7663 | ||
7664 | Function_type* fntype; | |
7665 | if (fn->is_function()) | |
7666 | fntype = fn->func_value()->type(); | |
7667 | else if (fn->is_function_declaration()) | |
7668 | fntype = fn->func_declaration_value()->type(); | |
e440a328 | 7669 | else |
0afbb937 | 7670 | go_unreachable(); |
7671 | Type* rtype = fntype->receiver()->type()->deref(); | |
7672 | Type* etype = (this->expr_type_ != NULL | |
7673 | ? this->expr_type_ | |
7674 | : this->expr_->type()); | |
7675 | etype = etype->deref(); | |
3a522dcc | 7676 | if (!Type::are_identical(rtype, etype, Type::COMPARE_TAGS, NULL)) |
0afbb937 | 7677 | this->report_error(_("method type does not match object type")); |
7678 | } | |
7679 | ||
7680 | // If a bound method expression is not simply called, then it is | |
7681 | // represented as a closure. The closure will hold a single variable, | |
7682 | // the receiver to pass to the method. The function will be a simple | |
7683 | // thunk that pulls that value from the closure and calls the method | |
7684 | // with the remaining arguments. | |
7685 | // | |
7686 | // Because method values are not common, we don't build all thunks for | |
7687 | // every methods, but instead only build them as we need them. In | |
7688 | // particular, we even build them on demand for methods defined in | |
7689 | // other packages. | |
7690 | ||
7691 | Bound_method_expression::Method_value_thunks | |
7692 | Bound_method_expression::method_value_thunks; | |
7693 | ||
7694 | // Find or create the thunk for METHOD. | |
7695 | ||
7696 | Named_object* | |
7697 | Bound_method_expression::create_thunk(Gogo* gogo, const Method* method, | |
7698 | Named_object* fn) | |
7699 | { | |
7700 | std::pair<Named_object*, Named_object*> val(fn, NULL); | |
7701 | std::pair<Method_value_thunks::iterator, bool> ins = | |
7702 | Bound_method_expression::method_value_thunks.insert(val); | |
7703 | if (!ins.second) | |
7704 | { | |
7705 | // We have seen this method before. | |
7706 | go_assert(ins.first->second != NULL); | |
7707 | return ins.first->second; | |
7708 | } | |
7709 | ||
7710 | Location loc = fn->location(); | |
7711 | ||
7712 | Function_type* orig_fntype; | |
7713 | if (fn->is_function()) | |
7714 | orig_fntype = fn->func_value()->type(); | |
7715 | else if (fn->is_function_declaration()) | |
7716 | orig_fntype = fn->func_declaration_value()->type(); | |
7717 | else | |
7718 | orig_fntype = NULL; | |
7719 | ||
7720 | if (orig_fntype == NULL || !orig_fntype->is_method()) | |
e440a328 | 7721 | { |
13f2fdb8 | 7722 | ins.first->second = |
7723 | Named_object::make_erroneous_name(gogo->thunk_name()); | |
0afbb937 | 7724 | return ins.first->second; |
e440a328 | 7725 | } |
0afbb937 | 7726 | |
7727 | Struct_field_list* sfl = new Struct_field_list(); | |
f8bdf81a | 7728 | // The type here is wrong--it should be the C function type. But it |
7729 | // doesn't really matter. | |
0afbb937 | 7730 | Type* vt = Type::make_pointer_type(Type::make_void_type()); |
13f2fdb8 | 7731 | sfl->push_back(Struct_field(Typed_identifier("fn", vt, loc))); |
7732 | sfl->push_back(Struct_field(Typed_identifier("val", | |
0afbb937 | 7733 | orig_fntype->receiver()->type(), |
7734 | loc))); | |
6bf4793c | 7735 | Struct_type* st = Type::make_struct_type(sfl, loc); |
7736 | st->set_is_struct_incomparable(); | |
7737 | Type* closure_type = Type::make_pointer_type(st); | |
0afbb937 | 7738 | |
f8bdf81a | 7739 | Function_type* new_fntype = orig_fntype->copy_with_names(); |
0afbb937 | 7740 | |
13f2fdb8 | 7741 | std::string thunk_name = gogo->thunk_name(); |
da244e59 | 7742 | Named_object* new_no = gogo->start_function(thunk_name, new_fntype, |
0afbb937 | 7743 | false, loc); |
7744 | ||
f8bdf81a | 7745 | Variable* cvar = new Variable(closure_type, NULL, false, false, false, loc); |
7746 | cvar->set_is_used(); | |
1ecc6157 | 7747 | cvar->set_is_closure(); |
da244e59 | 7748 | Named_object* cp = Named_object::make_variable("$closure" + thunk_name, |
7749 | NULL, cvar); | |
f8bdf81a | 7750 | new_no->func_value()->set_closure_var(cp); |
0afbb937 | 7751 | |
f8bdf81a | 7752 | gogo->start_block(loc); |
0afbb937 | 7753 | |
7754 | // Field 0 of the closure is the function code pointer, field 1 is | |
7755 | // the value on which to invoke the method. | |
7756 | Expression* arg = Expression::make_var_reference(cp, loc); | |
f614ea8b | 7757 | arg = Expression::make_dereference(arg, NIL_CHECK_NOT_NEEDED, loc); |
0afbb937 | 7758 | arg = Expression::make_field_reference(arg, 1, loc); |
7759 | ||
7760 | Expression* bme = Expression::make_bound_method(arg, method, fn, loc); | |
7761 | ||
7762 | const Typed_identifier_list* orig_params = orig_fntype->parameters(); | |
7763 | Expression_list* args; | |
7764 | if (orig_params == NULL || orig_params->empty()) | |
7765 | args = NULL; | |
7766 | else | |
7767 | { | |
7768 | const Typed_identifier_list* new_params = new_fntype->parameters(); | |
7769 | args = new Expression_list(); | |
7770 | for (Typed_identifier_list::const_iterator p = new_params->begin(); | |
f8bdf81a | 7771 | p != new_params->end(); |
0afbb937 | 7772 | ++p) |
7773 | { | |
7774 | Named_object* p_no = gogo->lookup(p->name(), NULL); | |
7775 | go_assert(p_no != NULL | |
7776 | && p_no->is_variable() | |
7777 | && p_no->var_value()->is_parameter()); | |
7778 | args->push_back(Expression::make_var_reference(p_no, loc)); | |
7779 | } | |
7780 | } | |
7781 | ||
7782 | Call_expression* call = Expression::make_call(bme, args, | |
7783 | orig_fntype->is_varargs(), | |
7784 | loc); | |
7785 | call->set_varargs_are_lowered(); | |
7786 | ||
7787 | Statement* s = Statement::make_return_from_call(call, loc); | |
7788 | gogo->add_statement(s); | |
7789 | Block* b = gogo->finish_block(loc); | |
7790 | gogo->add_block(b, loc); | |
7791 | gogo->lower_block(new_no, b); | |
a32698ee | 7792 | gogo->flatten_block(new_no, b); |
0afbb937 | 7793 | gogo->finish_function(loc); |
7794 | ||
7795 | ins.first->second = new_no; | |
7796 | return new_no; | |
7797 | } | |
7798 | ||
7799 | // Return an expression to check *REF for nil while dereferencing | |
7800 | // according to FIELD_INDEXES. Update *REF to build up the field | |
7801 | // reference. This is a static function so that we don't have to | |
7802 | // worry about declaring Field_indexes in expressions.h. | |
7803 | ||
7804 | static Expression* | |
7805 | bme_check_nil(const Method::Field_indexes* field_indexes, Location loc, | |
7806 | Expression** ref) | |
7807 | { | |
7808 | if (field_indexes == NULL) | |
7809 | return Expression::make_boolean(false, loc); | |
7810 | Expression* cond = bme_check_nil(field_indexes->next, loc, ref); | |
7811 | Struct_type* stype = (*ref)->type()->deref()->struct_type(); | |
7812 | go_assert(stype != NULL | |
7813 | && field_indexes->field_index < stype->field_count()); | |
7814 | if ((*ref)->type()->struct_type() == NULL) | |
7815 | { | |
7816 | go_assert((*ref)->type()->points_to() != NULL); | |
7817 | Expression* n = Expression::make_binary(OPERATOR_EQEQ, *ref, | |
7818 | Expression::make_nil(loc), | |
7819 | loc); | |
7820 | cond = Expression::make_binary(OPERATOR_OROR, cond, n, loc); | |
f614ea8b | 7821 | *ref = Expression::make_dereference(*ref, Expression::NIL_CHECK_DEFAULT, |
7822 | loc); | |
0afbb937 | 7823 | go_assert((*ref)->type()->struct_type() == stype); |
7824 | } | |
7825 | *ref = Expression::make_field_reference(*ref, field_indexes->field_index, | |
7826 | loc); | |
7827 | return cond; | |
e440a328 | 7828 | } |
7829 | ||
cd39797e | 7830 | // Flatten a method value into a struct with nil checks. We can't do |
7831 | // this in the lowering phase, because if the method value is called | |
7832 | // directly we don't need a thunk. That case will have been handled | |
7833 | // by Call_expression::do_lower, so if we get here then we do need a | |
7834 | // thunk. | |
e440a328 | 7835 | |
cd39797e | 7836 | Expression* |
7837 | Bound_method_expression::do_flatten(Gogo* gogo, Named_object*, | |
7838 | Statement_inserter* inserter) | |
e440a328 | 7839 | { |
cd39797e | 7840 | Location loc = this->location(); |
7841 | ||
7842 | Named_object* thunk = Bound_method_expression::create_thunk(gogo, | |
0afbb937 | 7843 | this->method_, |
7844 | this->function_); | |
7845 | if (thunk->is_erroneous()) | |
7846 | { | |
7847 | go_assert(saw_errors()); | |
cd39797e | 7848 | return Expression::make_error(loc); |
0afbb937 | 7849 | } |
7850 | ||
cd39797e | 7851 | // Force the expression into a variable. This is only necessary if |
7852 | // we are going to do nil checks below, but it's easy enough to | |
7853 | // always do it. | |
7854 | Expression* expr = this->expr_; | |
7855 | if (!expr->is_variable()) | |
7856 | { | |
7857 | Temporary_statement* etemp = Statement::make_temporary(NULL, expr, loc); | |
7858 | inserter->insert(etemp); | |
7859 | expr = Expression::make_temporary_reference(etemp, loc); | |
7860 | } | |
0afbb937 | 7861 | |
7862 | // If the method expects a value, and we have a pointer, we need to | |
7863 | // dereference the pointer. | |
7864 | ||
7865 | Named_object* fn = this->method_->named_object(); | |
cd39797e | 7866 | Function_type *fntype; |
0afbb937 | 7867 | if (fn->is_function()) |
7868 | fntype = fn->func_value()->type(); | |
7869 | else if (fn->is_function_declaration()) | |
7870 | fntype = fn->func_declaration_value()->type(); | |
7871 | else | |
7872 | go_unreachable(); | |
7873 | ||
cd39797e | 7874 | Expression* val = expr; |
0afbb937 | 7875 | if (fntype->receiver()->type()->points_to() == NULL |
7876 | && val->type()->points_to() != NULL) | |
f614ea8b | 7877 | val = Expression::make_dereference(val, NIL_CHECK_DEFAULT, loc); |
0afbb937 | 7878 | |
7879 | // Note that we are ignoring this->expr_type_ here. The thunk will | |
7880 | // expect a closure whose second field has type this->expr_type_ (if | |
7881 | // that is not NULL). We are going to pass it a closure whose | |
7882 | // second field has type this->expr_->type(). Since | |
7883 | // this->expr_type_ is only not-NULL for pointer types, we can get | |
7884 | // away with this. | |
7885 | ||
7886 | Struct_field_list* fields = new Struct_field_list(); | |
13f2fdb8 | 7887 | fields->push_back(Struct_field(Typed_identifier("fn", |
0afbb937 | 7888 | thunk->func_value()->type(), |
7889 | loc))); | |
13f2fdb8 | 7890 | fields->push_back(Struct_field(Typed_identifier("val", val->type(), loc))); |
0afbb937 | 7891 | Struct_type* st = Type::make_struct_type(fields, loc); |
6bf4793c | 7892 | st->set_is_struct_incomparable(); |
0afbb937 | 7893 | |
7894 | Expression_list* vals = new Expression_list(); | |
7895 | vals->push_back(Expression::make_func_code_reference(thunk, loc)); | |
7896 | vals->push_back(val); | |
7897 | ||
7898 | Expression* ret = Expression::make_struct_composite_literal(st, vals, loc); | |
c1177ba4 | 7899 | ret = Expression::make_heap_expression(ret, loc); |
0afbb937 | 7900 | |
c1177ba4 | 7901 | Node* n = Node::make_node(this); |
7902 | if ((n->encoding() & ESCAPE_MASK) == Node::ESCAPE_NONE) | |
7903 | ret->heap_expression()->set_allocate_on_stack(); | |
7904 | else if (gogo->compiling_runtime() && gogo->package_name() == "runtime") | |
7905 | go_error_at(loc, "%s escapes to heap, not allowed in runtime", | |
7906 | n->ast_format(gogo).c_str()); | |
cd39797e | 7907 | |
7908 | // If necessary, check whether the expression or any embedded | |
7909 | // pointers are nil. | |
0afbb937 | 7910 | |
df7ef1fd | 7911 | Expression* nil_check = NULL; |
0afbb937 | 7912 | if (this->method_->field_indexes() != NULL) |
7913 | { | |
0afbb937 | 7914 | Expression* ref = expr; |
7915 | nil_check = bme_check_nil(this->method_->field_indexes(), loc, &ref); | |
7916 | expr = ref; | |
7917 | } | |
7918 | ||
7919 | if (this->method_->is_value_method() && expr->type()->points_to() != NULL) | |
7920 | { | |
7921 | Expression* n = Expression::make_binary(OPERATOR_EQEQ, expr, | |
7922 | Expression::make_nil(loc), | |
7923 | loc); | |
7924 | if (nil_check == NULL) | |
7925 | nil_check = n; | |
7926 | else | |
7927 | nil_check = Expression::make_binary(OPERATOR_OROR, nil_check, n, loc); | |
7928 | } | |
7929 | ||
7930 | if (nil_check != NULL) | |
7931 | { | |
cd39797e | 7932 | Expression* crash = gogo->runtime_error(RUNTIME_ERROR_NIL_DEREFERENCE, |
7933 | loc); | |
7934 | // Fix the type of the conditional expression by pretending to | |
7935 | // evaluate to RET either way through the conditional. | |
7936 | crash = Expression::make_compound(crash, ret, loc); | |
7937 | ret = Expression::make_conditional(nil_check, crash, ret, loc); | |
7938 | } | |
7939 | ||
7940 | // RET is a pointer to a struct, but we want a function type. | |
7941 | ret = Expression::make_unsafe_cast(this->type(), ret, loc); | |
7942 | ||
7943 | return ret; | |
e440a328 | 7944 | } |
7945 | ||
d751bb78 | 7946 | // Dump ast representation of a bound method expression. |
7947 | ||
7948 | void | |
7949 | Bound_method_expression::do_dump_expression(Ast_dump_context* ast_dump_context) | |
7950 | const | |
7951 | { | |
7952 | if (this->expr_type_ != NULL) | |
7953 | ast_dump_context->ostream() << "("; | |
f03a9fbf | 7954 | ast_dump_context->dump_expression(this->expr_); |
7955 | if (this->expr_type_ != NULL) | |
d751bb78 | 7956 | { |
7957 | ast_dump_context->ostream() << ":"; | |
7958 | ast_dump_context->dump_type(this->expr_type_); | |
7959 | ast_dump_context->ostream() << ")"; | |
7960 | } | |
f03a9fbf | 7961 | |
0afbb937 | 7962 | ast_dump_context->ostream() << "." << this->function_->name(); |
d751bb78 | 7963 | } |
7964 | ||
e440a328 | 7965 | // Make a method expression. |
7966 | ||
7967 | Bound_method_expression* | |
0afbb937 | 7968 | Expression::make_bound_method(Expression* expr, const Method* method, |
7969 | Named_object* function, Location location) | |
e440a328 | 7970 | { |
0afbb937 | 7971 | return new Bound_method_expression(expr, method, function, location); |
e440a328 | 7972 | } |
7973 | ||
7974 | // Class Builtin_call_expression. This is used for a call to a | |
7975 | // builtin function. | |
7976 | ||
e440a328 | 7977 | Builtin_call_expression::Builtin_call_expression(Gogo* gogo, |
7978 | Expression* fn, | |
7979 | Expression_list* args, | |
7980 | bool is_varargs, | |
b13c66cd | 7981 | Location location) |
e440a328 | 7982 | : Call_expression(fn, args, is_varargs, location), |
6334270b | 7983 | gogo_(gogo), code_(BUILTIN_INVALID), seen_(false), |
7984 | recover_arg_is_set_(false) | |
e440a328 | 7985 | { |
7986 | Func_expression* fnexp = this->fn()->func_expression(); | |
79651b1f | 7987 | if (fnexp == NULL) |
7988 | { | |
7989 | this->code_ = BUILTIN_INVALID; | |
7990 | return; | |
7991 | } | |
e440a328 | 7992 | const std::string& name(fnexp->named_object()->name()); |
7993 | if (name == "append") | |
7994 | this->code_ = BUILTIN_APPEND; | |
7995 | else if (name == "cap") | |
7996 | this->code_ = BUILTIN_CAP; | |
7997 | else if (name == "close") | |
7998 | this->code_ = BUILTIN_CLOSE; | |
48080209 | 7999 | else if (name == "complex") |
8000 | this->code_ = BUILTIN_COMPLEX; | |
e440a328 | 8001 | else if (name == "copy") |
8002 | this->code_ = BUILTIN_COPY; | |
1cce762f | 8003 | else if (name == "delete") |
8004 | this->code_ = BUILTIN_DELETE; | |
e440a328 | 8005 | else if (name == "imag") |
8006 | this->code_ = BUILTIN_IMAG; | |
8007 | else if (name == "len") | |
8008 | this->code_ = BUILTIN_LEN; | |
8009 | else if (name == "make") | |
8010 | this->code_ = BUILTIN_MAKE; | |
8011 | else if (name == "new") | |
8012 | this->code_ = BUILTIN_NEW; | |
8013 | else if (name == "panic") | |
8014 | this->code_ = BUILTIN_PANIC; | |
8015 | else if (name == "print") | |
8016 | this->code_ = BUILTIN_PRINT; | |
8017 | else if (name == "println") | |
8018 | this->code_ = BUILTIN_PRINTLN; | |
8019 | else if (name == "real") | |
8020 | this->code_ = BUILTIN_REAL; | |
8021 | else if (name == "recover") | |
8022 | this->code_ = BUILTIN_RECOVER; | |
8023 | else if (name == "Alignof") | |
8024 | this->code_ = BUILTIN_ALIGNOF; | |
8025 | else if (name == "Offsetof") | |
8026 | this->code_ = BUILTIN_OFFSETOF; | |
8027 | else if (name == "Sizeof") | |
8028 | this->code_ = BUILTIN_SIZEOF; | |
8029 | else | |
c3e6f413 | 8030 | go_unreachable(); |
e440a328 | 8031 | } |
8032 | ||
8033 | // Return whether this is a call to recover. This is a virtual | |
8034 | // function called from the parent class. | |
8035 | ||
8036 | bool | |
8037 | Builtin_call_expression::do_is_recover_call() const | |
8038 | { | |
8039 | if (this->classification() == EXPRESSION_ERROR) | |
8040 | return false; | |
8041 | return this->code_ == BUILTIN_RECOVER; | |
8042 | } | |
8043 | ||
8044 | // Set the argument for a call to recover. | |
8045 | ||
8046 | void | |
8047 | Builtin_call_expression::do_set_recover_arg(Expression* arg) | |
8048 | { | |
8049 | const Expression_list* args = this->args(); | |
c484d925 | 8050 | go_assert(args == NULL || args->empty()); |
e440a328 | 8051 | Expression_list* new_args = new Expression_list(); |
8052 | new_args->push_back(arg); | |
8053 | this->set_args(new_args); | |
6334270b | 8054 | this->recover_arg_is_set_ = true; |
e440a328 | 8055 | } |
8056 | ||
e440a328 | 8057 | // Lower a builtin call expression. This turns new and make into |
8058 | // specific expressions. We also convert to a constant if we can. | |
8059 | ||
8060 | Expression* | |
321e5ad2 | 8061 | Builtin_call_expression::do_lower(Gogo*, Named_object* function, |
ceeb4318 | 8062 | Statement_inserter* inserter, int) |
e440a328 | 8063 | { |
79651b1f | 8064 | if (this->is_error_expression()) |
a9182619 | 8065 | return this; |
8066 | ||
b13c66cd | 8067 | Location loc = this->location(); |
1cce762f | 8068 | |
a8725655 | 8069 | if (this->is_varargs() && this->code_ != BUILTIN_APPEND) |
8070 | { | |
8071 | this->report_error(_("invalid use of %<...%> with builtin function")); | |
1cce762f | 8072 | return Expression::make_error(loc); |
a8725655 | 8073 | } |
8074 | ||
393ba00b | 8075 | if (this->code_ == BUILTIN_OFFSETOF) |
8076 | { | |
8077 | Expression* arg = this->one_arg(); | |
12e69faa | 8078 | |
8079 | if (arg->bound_method_expression() != NULL | |
8080 | || arg->interface_field_reference_expression() != NULL) | |
8081 | { | |
8082 | this->report_error(_("invalid use of method value as argument " | |
8083 | "of Offsetof")); | |
8084 | return this; | |
8085 | } | |
8086 | ||
393ba00b | 8087 | Field_reference_expression* farg = arg->field_reference_expression(); |
8088 | while (farg != NULL) | |
8089 | { | |
8090 | if (!farg->implicit()) | |
8091 | break; | |
8092 | // When the selector refers to an embedded field, | |
8093 | // it must not be reached through pointer indirections. | |
8094 | if (farg->expr()->deref() != farg->expr()) | |
8095 | { | |
12e69faa | 8096 | this->report_error(_("argument of Offsetof implies " |
8097 | "indirection of an embedded field")); | |
393ba00b | 8098 | return this; |
8099 | } | |
8100 | // Go up until we reach the original base. | |
8101 | farg = farg->expr()->field_reference_expression(); | |
8102 | } | |
8103 | } | |
f03a9fbf | 8104 | |
1cce762f | 8105 | if (this->is_constant()) |
e440a328 | 8106 | { |
0c77715b | 8107 | Numeric_constant nc; |
8108 | if (this->numeric_constant_value(&nc)) | |
8109 | return nc.expression(loc); | |
e440a328 | 8110 | } |
1cce762f | 8111 | |
8112 | switch (this->code_) | |
e440a328 | 8113 | { |
1cce762f | 8114 | default: |
8115 | break; | |
8116 | ||
8117 | case BUILTIN_NEW: | |
8118 | { | |
8119 | const Expression_list* args = this->args(); | |
8120 | if (args == NULL || args->size() < 1) | |
8121 | this->report_error(_("not enough arguments")); | |
8122 | else if (args->size() > 1) | |
8123 | this->report_error(_("too many arguments")); | |
8124 | else | |
8125 | { | |
8126 | Expression* arg = args->front(); | |
8127 | if (!arg->is_type_expression()) | |
8128 | { | |
631d5788 | 8129 | go_error_at(arg->location(), "expected type"); |
1cce762f | 8130 | this->set_is_error(); |
8131 | } | |
8132 | else | |
8133 | return Expression::make_allocation(arg->type(), loc); | |
8134 | } | |
8135 | } | |
8136 | break; | |
8137 | ||
8138 | case BUILTIN_MAKE: | |
321e5ad2 | 8139 | return this->lower_make(inserter); |
1cce762f | 8140 | |
8141 | case BUILTIN_RECOVER: | |
e440a328 | 8142 | if (function != NULL) |
8143 | function->func_value()->set_calls_recover(); | |
8144 | else | |
8145 | { | |
8146 | // Calling recover outside of a function always returns the | |
8147 | // nil empty interface. | |
823c7e3d | 8148 | Type* eface = Type::make_empty_interface_type(loc); |
1cce762f | 8149 | return Expression::make_cast(eface, Expression::make_nil(loc), loc); |
e440a328 | 8150 | } |
1cce762f | 8151 | break; |
8152 | ||
1cce762f | 8153 | case BUILTIN_DELETE: |
8154 | { | |
26329c24 | 8155 | const Expression_list* args = this->args(); |
8156 | if (args == NULL || args->size() < 2) | |
8157 | this->report_error(_("not enough arguments")); | |
8158 | else if (args->size() > 2) | |
8159 | this->report_error(_("too many arguments")); | |
8160 | else if (args->front()->type()->map_type() == NULL) | |
8161 | this->report_error(_("argument 1 must be a map")); | |
8162 | else | |
8163 | { | |
8164 | Type* key_type = | |
8165 | args->front()->type()->map_type()->key_type(); | |
8166 | Expression_list::iterator pa = this->args()->begin(); | |
8167 | pa++; | |
8168 | Type* arg_type = (*pa)->type(); | |
8169 | std::string reason; | |
8170 | if (!Type::are_assignable(key_type, arg_type, &reason)) | |
8171 | { | |
8172 | if (reason.empty()) | |
8173 | go_error_at(loc, "argument 2 has incompatible type"); | |
8174 | else | |
8175 | go_error_at(loc, "argument 2 has incompatible type (%s)", | |
8176 | reason.c_str()); | |
8177 | this->set_is_error(); | |
8178 | } | |
8179 | else if (!Type::are_identical(key_type, arg_type, 0, NULL)) | |
8180 | *pa = Expression::make_cast(key_type, *pa, loc); | |
8181 | } | |
1cce762f | 8182 | } |
8183 | break; | |
88b03a70 | 8184 | |
8185 | case BUILTIN_PRINT: | |
8186 | case BUILTIN_PRINTLN: | |
8187 | // Force all the arguments into temporary variables, so that we | |
8188 | // don't try to evaluate something while holding the print lock. | |
8189 | if (this->args() == NULL) | |
8190 | break; | |
8191 | for (Expression_list::iterator pa = this->args()->begin(); | |
8192 | pa != this->args()->end(); | |
8193 | ++pa) | |
8194 | { | |
493ce3ee | 8195 | if (!(*pa)->is_variable() && !(*pa)->is_constant()) |
88b03a70 | 8196 | { |
8197 | Temporary_statement* temp = | |
8198 | Statement::make_temporary(NULL, *pa, loc); | |
8199 | inserter->insert(temp); | |
8200 | *pa = Expression::make_temporary_reference(temp, loc); | |
8201 | } | |
8202 | } | |
8203 | break; | |
e440a328 | 8204 | } |
8205 | ||
8206 | return this; | |
8207 | } | |
8208 | ||
7fdb0876 | 8209 | // Flatten a builtin call expression. This turns the arguments of some |
8210 | // builtin calls into temporary expressions. Also expand copy and append | |
8211 | // to runtime calls. | |
35a54f17 | 8212 | |
8213 | Expression* | |
321e5ad2 | 8214 | Builtin_call_expression::do_flatten(Gogo* gogo, Named_object* function, |
35a54f17 | 8215 | Statement_inserter* inserter) |
8216 | { | |
26329c24 | 8217 | if (this->is_error_expression()) |
8218 | { | |
8219 | go_assert(saw_errors()); | |
8220 | return this; | |
8221 | } | |
8222 | ||
16cb7fec | 8223 | Location loc = this->location(); |
8224 | ||
8225 | switch (this->code_) | |
35a54f17 | 8226 | { |
16cb7fec | 8227 | default: |
8228 | break; | |
8229 | ||
8230 | case BUILTIN_APPEND: | |
d3c55148 | 8231 | return this->flatten_append(gogo, function, inserter, NULL, NULL); |
321e5ad2 | 8232 | |
16cb7fec | 8233 | case BUILTIN_COPY: |
8234 | { | |
8235 | Type* at = this->args()->front()->type(); | |
8236 | for (Expression_list::iterator pa = this->args()->begin(); | |
8237 | pa != this->args()->end(); | |
8238 | ++pa) | |
8239 | { | |
8240 | if ((*pa)->is_nil_expression()) | |
8241 | { | |
8242 | Expression* nil = Expression::make_nil(loc); | |
8243 | Expression* zero = Expression::make_integer_ul(0, NULL, loc); | |
8244 | *pa = Expression::make_slice_value(at, nil, zero, zero, loc); | |
8245 | } | |
8246 | if (!(*pa)->is_variable()) | |
8247 | { | |
8248 | Temporary_statement* temp = | |
8249 | Statement::make_temporary(NULL, *pa, loc); | |
8250 | inserter->insert(temp); | |
8251 | *pa = Expression::make_temporary_reference(temp, loc); | |
8252 | } | |
8253 | } | |
7fdb0876 | 8254 | |
8255 | // Lower to runtime call. | |
8256 | const Expression_list* args = this->args(); | |
8257 | go_assert(args != NULL && args->size() == 2); | |
8258 | Expression* arg1 = args->front(); | |
8259 | Expression* arg2 = args->back(); | |
8260 | go_assert(arg1->is_variable()); | |
8261 | go_assert(arg2->is_variable()); | |
8262 | bool arg2_is_string = arg2->type()->is_string_type(); | |
8263 | ||
8264 | Expression* ret; | |
8265 | Type* et = at->array_type()->element_type(); | |
8266 | if (et->has_pointer()) | |
8267 | { | |
8268 | Expression* td = Expression::make_type_descriptor(et, loc); | |
8269 | ret = Runtime::make_call(Runtime::TYPEDSLICECOPY, loc, | |
8270 | 3, td, arg1, arg2); | |
8271 | } | |
8272 | else | |
8273 | { | |
8274 | Type* int_type = Type::lookup_integer_type("int"); | |
8275 | Type* uintptr_type = Type::lookup_integer_type("uintptr"); | |
8276 | ||
8277 | // l1 = len(arg1) | |
8278 | Named_object* lenfn = gogo->lookup_global("len"); | |
8279 | Expression* lenref = Expression::make_func_reference(lenfn, NULL, loc); | |
8280 | Expression_list* len_args = new Expression_list(); | |
8281 | len_args->push_back(arg1->copy()); | |
8282 | Expression* len1 = Expression::make_call(lenref, len_args, false, loc); | |
8283 | gogo->lower_expression(function, inserter, &len1); | |
8284 | gogo->flatten_expression(function, inserter, &len1); | |
8285 | Temporary_statement* l1tmp = Statement::make_temporary(int_type, len1, loc); | |
8286 | inserter->insert(l1tmp); | |
8287 | ||
8288 | // l2 = len(arg2) | |
8289 | len_args = new Expression_list(); | |
8290 | len_args->push_back(arg2->copy()); | |
8291 | Expression* len2 = Expression::make_call(lenref, len_args, false, loc); | |
8292 | gogo->lower_expression(function, inserter, &len2); | |
8293 | gogo->flatten_expression(function, inserter, &len2); | |
8294 | Temporary_statement* l2tmp = Statement::make_temporary(int_type, len2, loc); | |
8295 | inserter->insert(l2tmp); | |
8296 | ||
8297 | // n = (l1 < l2 ? l1 : l2) | |
8298 | Expression* l1ref = Expression::make_temporary_reference(l1tmp, loc); | |
8299 | Expression* l2ref = Expression::make_temporary_reference(l2tmp, loc); | |
8300 | Expression* cond = Expression::make_binary(OPERATOR_LT, l1ref, l2ref, loc); | |
8301 | Expression* n = Expression::make_conditional(cond, | |
8302 | l1ref->copy(), | |
8303 | l2ref->copy(), | |
8304 | loc); | |
8305 | Temporary_statement* ntmp = Statement::make_temporary(NULL, n, loc); | |
8306 | inserter->insert(ntmp); | |
8307 | ||
8308 | // sz = n * sizeof(elem_type) | |
8309 | Expression* nref = Expression::make_temporary_reference(ntmp, loc); | |
8310 | nref = Expression::make_cast(uintptr_type, nref, loc); | |
8311 | Expression* sz = Expression::make_type_info(et, TYPE_INFO_SIZE); | |
8312 | sz = Expression::make_binary(OPERATOR_MULT, sz, nref, loc); | |
8313 | ||
8314 | // memmove(arg1.ptr, arg2.ptr, sz) | |
8315 | Expression* p1 = Expression::make_slice_info(arg1, | |
8316 | SLICE_INFO_VALUE_POINTER, | |
8317 | loc); | |
8318 | Expression* p2 = (arg2_is_string | |
8319 | ? Expression::make_string_info(arg2, | |
8320 | STRING_INFO_DATA, | |
8321 | loc) | |
8322 | : Expression::make_slice_info(arg2, | |
8323 | SLICE_INFO_VALUE_POINTER, | |
8324 | loc)); | |
8325 | Expression* call = Runtime::make_call(Runtime::BUILTIN_MEMMOVE, loc, 3, | |
8326 | p1, p2, sz); | |
8327 | ||
8328 | // n is the return value of copy | |
8329 | nref = Expression::make_temporary_reference(ntmp, loc); | |
8330 | ret = Expression::make_compound(call, nref, loc); | |
8331 | } | |
8332 | return ret; | |
16cb7fec | 8333 | } |
8334 | break; | |
8335 | ||
8336 | case BUILTIN_PANIC: | |
35a54f17 | 8337 | for (Expression_list::iterator pa = this->args()->begin(); |
16cb7fec | 8338 | pa != this->args()->end(); |
8339 | ++pa) | |
8340 | { | |
8341 | if (!(*pa)->is_variable() && (*pa)->type()->interface_type() != NULL) | |
55e8ba6a | 8342 | { |
16cb7fec | 8343 | Temporary_statement* temp = |
8344 | Statement::make_temporary(NULL, *pa, loc); | |
8345 | inserter->insert(temp); | |
8346 | *pa = Expression::make_temporary_reference(temp, loc); | |
55e8ba6a | 8347 | } |
16cb7fec | 8348 | } |
7739537f | 8349 | break; |
0d5530d9 | 8350 | |
8351 | case BUILTIN_LEN: | |
132ed071 | 8352 | case BUILTIN_CAP: |
321e5ad2 | 8353 | { |
8354 | Expression_list::iterator pa = this->args()->begin(); | |
8355 | if (!(*pa)->is_variable() | |
8356 | && ((*pa)->type()->map_type() != NULL | |
8357 | || (*pa)->type()->channel_type() != NULL)) | |
8358 | { | |
8359 | Temporary_statement* temp = | |
8360 | Statement::make_temporary(NULL, *pa, loc); | |
8361 | inserter->insert(temp); | |
8362 | *pa = Expression::make_temporary_reference(temp, loc); | |
8363 | } | |
8364 | } | |
8365 | break; | |
26329c24 | 8366 | |
8367 | case BUILTIN_DELETE: | |
8368 | { | |
8369 | // Lower to a runtime function call. | |
8370 | const Expression_list* args = this->args(); | |
8371 | ||
8372 | // Since this function returns no value it must appear in | |
8373 | // a statement by itself, so we don't have to worry about | |
8374 | // order of evaluation of values around it. Evaluate the | |
8375 | // map first to get order of evaluation right. | |
8376 | Map_type* mt = args->front()->type()->map_type(); | |
8377 | Temporary_statement* map_temp = | |
8378 | Statement::make_temporary(mt, args->front(), loc); | |
8379 | inserter->insert(map_temp); | |
8380 | ||
8381 | Temporary_statement* key_temp = | |
8382 | Statement::make_temporary(mt->key_type(), args->back(), loc); | |
8383 | inserter->insert(key_temp); | |
8384 | ||
8385 | Expression* e1 = Expression::make_type_descriptor(mt, loc); | |
8386 | Expression* e2 = Expression::make_temporary_reference(map_temp, | |
8387 | loc); | |
8388 | Expression* e3 = Expression::make_temporary_reference(key_temp, | |
8389 | loc); | |
8390 | ||
8391 | Runtime::Function code; | |
8392 | switch (mt->algorithm(gogo)) | |
8393 | { | |
8394 | case Map_type::MAP_ALG_FAST32: | |
8395 | case Map_type::MAP_ALG_FAST32PTR: | |
8396 | { | |
8397 | code = Runtime::MAPDELETE_FAST32; | |
8398 | Type* uint32_type = Type::lookup_integer_type("uint32"); | |
8399 | Type* uint32_ptr_type = Type::make_pointer_type(uint32_type); | |
8400 | e3 = Expression::make_unary(OPERATOR_AND, e3, loc); | |
8401 | e3 = Expression::make_unsafe_cast(uint32_ptr_type, e3, | |
8402 | loc); | |
8403 | e3 = Expression::make_dereference(e3, | |
8404 | Expression::NIL_CHECK_NOT_NEEDED, | |
8405 | loc); | |
8406 | break; | |
8407 | } | |
8408 | case Map_type::MAP_ALG_FAST64: | |
8409 | case Map_type::MAP_ALG_FAST64PTR: | |
8410 | { | |
8411 | code = Runtime::MAPDELETE_FAST64; | |
8412 | Type* uint64_type = Type::lookup_integer_type("uint64"); | |
8413 | Type* uint64_ptr_type = Type::make_pointer_type(uint64_type); | |
8414 | e3 = Expression::make_unary(OPERATOR_AND, e3, loc); | |
8415 | e3 = Expression::make_unsafe_cast(uint64_ptr_type, e3, | |
8416 | loc); | |
8417 | e3 = Expression::make_dereference(e3, | |
8418 | Expression::NIL_CHECK_NOT_NEEDED, | |
8419 | loc); | |
8420 | break; | |
8421 | } | |
8422 | case Map_type::MAP_ALG_FASTSTR: | |
8423 | code = Runtime::MAPDELETE_FASTSTR; | |
8424 | break; | |
8425 | default: | |
8426 | code = Runtime::MAPDELETE; | |
8427 | ||
8428 | // If the call to delete is deferred, and is in a loop, | |
8429 | // then the loop will only have a single instance of the | |
8430 | // temporary variable. Passing the address of the | |
8431 | // temporary variable here means that the deferred call | |
8432 | // will see the last value in the loop, not the current | |
8433 | // value. So for this unusual case copy the value into | |
8434 | // the heap. | |
8435 | if (!this->is_deferred()) | |
8436 | e3 = Expression::make_unary(OPERATOR_AND, e3, loc); | |
8437 | else | |
8438 | { | |
8439 | Expression* a = Expression::make_allocation(mt->key_type(), | |
8440 | loc); | |
8441 | Temporary_statement* atemp = | |
8442 | Statement::make_temporary(NULL, a, loc); | |
8443 | inserter->insert(atemp); | |
8444 | ||
8445 | a = Expression::make_temporary_reference(atemp, loc); | |
8446 | a = Expression::make_dereference(a, NIL_CHECK_NOT_NEEDED, loc); | |
8447 | Statement* s = Statement::make_assignment(a, e3, loc); | |
8448 | inserter->insert(s); | |
8449 | ||
8450 | e3 = Expression::make_temporary_reference(atemp, loc); | |
8451 | } | |
8452 | } | |
8453 | ||
8454 | return Runtime::make_call(code, loc, 3, e1, e2, e3); | |
8455 | } | |
35a54f17 | 8456 | } |
16cb7fec | 8457 | |
35a54f17 | 8458 | return this; |
8459 | } | |
8460 | ||
a9182619 | 8461 | // Lower a make expression. |
8462 | ||
8463 | Expression* | |
321e5ad2 | 8464 | Builtin_call_expression::lower_make(Statement_inserter* inserter) |
a9182619 | 8465 | { |
b13c66cd | 8466 | Location loc = this->location(); |
a9182619 | 8467 | |
8468 | const Expression_list* args = this->args(); | |
8469 | if (args == NULL || args->size() < 1) | |
8470 | { | |
8471 | this->report_error(_("not enough arguments")); | |
8472 | return Expression::make_error(this->location()); | |
8473 | } | |
8474 | ||
8475 | Expression_list::const_iterator parg = args->begin(); | |
8476 | ||
8477 | Expression* first_arg = *parg; | |
8478 | if (!first_arg->is_type_expression()) | |
8479 | { | |
631d5788 | 8480 | go_error_at(first_arg->location(), "expected type"); |
a9182619 | 8481 | this->set_is_error(); |
8482 | return Expression::make_error(this->location()); | |
8483 | } | |
8484 | Type* type = first_arg->type(); | |
8485 | ||
22deed0d | 8486 | if (!type->in_heap()) |
8487 | go_error_at(first_arg->location(), | |
37423a84 | 8488 | "cannot make slice of go:notinheap type"); |
22deed0d | 8489 | |
a9182619 | 8490 | bool is_slice = false; |
8491 | bool is_map = false; | |
8492 | bool is_chan = false; | |
411eb89e | 8493 | if (type->is_slice_type()) |
a9182619 | 8494 | is_slice = true; |
8495 | else if (type->map_type() != NULL) | |
8496 | is_map = true; | |
8497 | else if (type->channel_type() != NULL) | |
8498 | is_chan = true; | |
8499 | else | |
8500 | { | |
8501 | this->report_error(_("invalid type for make function")); | |
8502 | return Expression::make_error(this->location()); | |
8503 | } | |
8504 | ||
f6bc81e6 | 8505 | Type_context int_context(Type::lookup_integer_type("int"), false); |
8506 | ||
a9182619 | 8507 | ++parg; |
8508 | Expression* len_arg; | |
ccea2b36 | 8509 | bool len_small = false; |
a9182619 | 8510 | if (parg == args->end()) |
8511 | { | |
8512 | if (is_slice) | |
8513 | { | |
8514 | this->report_error(_("length required when allocating a slice")); | |
8515 | return Expression::make_error(this->location()); | |
8516 | } | |
e67508fa | 8517 | len_arg = Expression::make_integer_ul(0, NULL, loc); |
33d1d391 | 8518 | len_small = true; |
a9182619 | 8519 | } |
8520 | else | |
8521 | { | |
8522 | len_arg = *parg; | |
f6bc81e6 | 8523 | len_arg->determine_type(&int_context); |
a065edc5 | 8524 | if (len_arg->type()->integer_type() == NULL) |
8525 | { | |
8526 | go_error_at(len_arg->location(), "non-integer len argument in make"); | |
8527 | return Expression::make_error(this->location()); | |
8528 | } | |
ccea2b36 | 8529 | if (!this->check_int_value(len_arg, true, &len_small)) |
1ad00fd4 | 8530 | return Expression::make_error(this->location()); |
a9182619 | 8531 | ++parg; |
8532 | } | |
8533 | ||
8534 | Expression* cap_arg = NULL; | |
ccea2b36 | 8535 | bool cap_small = false; |
72bf0e6e | 8536 | Numeric_constant nclen; |
8537 | Numeric_constant nccap; | |
8538 | unsigned long vlen; | |
8539 | unsigned long vcap; | |
a9182619 | 8540 | if (is_slice && parg != args->end()) |
8541 | { | |
8542 | cap_arg = *parg; | |
f6bc81e6 | 8543 | cap_arg->determine_type(&int_context); |
a065edc5 | 8544 | if (cap_arg->type()->integer_type() == NULL) |
8545 | { | |
8546 | go_error_at(cap_arg->location(), "non-integer cap argument in make"); | |
8547 | return Expression::make_error(this->location()); | |
8548 | } | |
ccea2b36 | 8549 | if (!this->check_int_value(cap_arg, false, &cap_small)) |
1ad00fd4 | 8550 | return Expression::make_error(this->location()); |
8551 | ||
1ad00fd4 | 8552 | if (len_arg->numeric_constant_value(&nclen) |
8553 | && cap_arg->numeric_constant_value(&nccap) | |
8554 | && nclen.to_unsigned_long(&vlen) == Numeric_constant::NC_UL_VALID | |
8555 | && nccap.to_unsigned_long(&vcap) == Numeric_constant::NC_UL_VALID | |
8556 | && vlen > vcap) | |
a9182619 | 8557 | { |
1ad00fd4 | 8558 | this->report_error(_("len larger than cap")); |
a9182619 | 8559 | return Expression::make_error(this->location()); |
8560 | } | |
1ad00fd4 | 8561 | |
a9182619 | 8562 | ++parg; |
8563 | } | |
8564 | ||
8565 | if (parg != args->end()) | |
8566 | { | |
8567 | this->report_error(_("too many arguments to make")); | |
8568 | return Expression::make_error(this->location()); | |
8569 | } | |
8570 | ||
b13c66cd | 8571 | Location type_loc = first_arg->location(); |
a9182619 | 8572 | |
8573 | Expression* call; | |
8574 | if (is_slice) | |
8575 | { | |
d633d0fb | 8576 | Temporary_statement* len_temp = NULL; |
8577 | if (!len_arg->is_constant()) | |
8578 | { | |
8579 | len_temp = Statement::make_temporary(NULL, len_arg, loc); | |
8580 | inserter->insert(len_temp); | |
8581 | len_arg = Expression::make_temporary_reference(len_temp, loc); | |
8582 | } | |
8583 | ||
a9182619 | 8584 | if (cap_arg == NULL) |
321e5ad2 | 8585 | { |
72bf0e6e | 8586 | cap_small = len_small; |
d633d0fb | 8587 | if (len_temp == NULL) |
8588 | cap_arg = len_arg->copy(); | |
8589 | else | |
8590 | cap_arg = Expression::make_temporary_reference(len_temp, loc); | |
8591 | } | |
8592 | else if (!cap_arg->is_constant()) | |
8593 | { | |
8594 | Temporary_statement* cap_temp = Statement::make_temporary(NULL, | |
8595 | cap_arg, | |
8596 | loc); | |
8597 | inserter->insert(cap_temp); | |
8598 | cap_arg = Expression::make_temporary_reference(cap_temp, loc); | |
321e5ad2 | 8599 | } |
ccea2b36 | 8600 | |
72bf0e6e | 8601 | Type* et = type->array_type()->element_type(); |
8602 | Expression* type_arg = Expression::make_type_descriptor(et, type_loc); | |
ccea2b36 | 8603 | Runtime::Function code = Runtime::MAKESLICE; |
8604 | if (!len_small || !cap_small) | |
8605 | code = Runtime::MAKESLICE64; | |
d633d0fb | 8606 | Expression* mem = Runtime::make_call(code, loc, 3, type_arg, len_arg, |
8607 | cap_arg); | |
8608 | mem = Expression::make_unsafe_cast(Type::make_pointer_type(et), mem, | |
8609 | loc); | |
f81232c1 | 8610 | Type* int_type = Type::lookup_integer_type("int"); |
8611 | len_arg = Expression::make_cast(int_type, len_arg->copy(), loc); | |
8612 | cap_arg = Expression::make_cast(int_type, cap_arg->copy(), loc); | |
8613 | call = Expression::make_slice_value(type, mem, len_arg, cap_arg, loc); | |
a9182619 | 8614 | } |
8615 | else if (is_map) | |
321e5ad2 | 8616 | { |
8617 | Expression* type_arg = Expression::make_type_descriptor(type, type_loc); | |
33d1d391 | 8618 | if (!len_small) |
8619 | call = Runtime::make_call(Runtime::MAKEMAP64, loc, 3, type_arg, | |
8620 | len_arg, | |
8621 | Expression::make_nil(loc)); | |
8622 | else | |
8623 | { | |
8624 | Numeric_constant nclen; | |
8625 | unsigned long vlen; | |
8626 | if (len_arg->numeric_constant_value(&nclen) | |
8627 | && nclen.to_unsigned_long(&vlen) == Numeric_constant::NC_UL_VALID | |
8628 | && vlen <= Map_type::bucket_size) | |
8629 | call = Runtime::make_call(Runtime::MAKEMAP_SMALL, loc, 0); | |
8630 | else | |
8631 | call = Runtime::make_call(Runtime::MAKEMAP, loc, 3, type_arg, | |
8632 | len_arg, | |
8633 | Expression::make_nil(loc)); | |
8634 | } | |
321e5ad2 | 8635 | } |
a9182619 | 8636 | else if (is_chan) |
321e5ad2 | 8637 | { |
8638 | Expression* type_arg = Expression::make_type_descriptor(type, type_loc); | |
1423c90a | 8639 | Runtime::Function code = Runtime::MAKECHAN; |
8640 | if (!len_small) | |
8641 | code = Runtime::MAKECHAN64; | |
8642 | call = Runtime::make_call(code, loc, 2, type_arg, len_arg); | |
321e5ad2 | 8643 | } |
a9182619 | 8644 | else |
8645 | go_unreachable(); | |
8646 | ||
8647 | return Expression::make_unsafe_cast(type, call, loc); | |
8648 | } | |
8649 | ||
321e5ad2 | 8650 | // Flatten a call to the predeclared append function. We do this in |
8651 | // the flatten phase, not the lowering phase, so that we run after | |
d3c55148 | 8652 | // type checking and after order_evaluations. If ASSIGN_LHS is not |
8653 | // NULL, this append is the right-hand-side of an assignment and | |
8654 | // ASSIGN_LHS is the left-hand-side; in that case, set LHS directly | |
8655 | // rather than returning a slice. This lets us omit a write barrier | |
8656 | // in common cases like a = append(a, ...) when the slice does not | |
8657 | // need to grow. ENCLOSING is not NULL iff ASSIGN_LHS is not NULL. | |
321e5ad2 | 8658 | |
8659 | Expression* | |
8660 | Builtin_call_expression::flatten_append(Gogo* gogo, Named_object* function, | |
d3c55148 | 8661 | Statement_inserter* inserter, |
8662 | Expression* assign_lhs, | |
8663 | Block* enclosing) | |
321e5ad2 | 8664 | { |
8665 | if (this->is_error_expression()) | |
8666 | return this; | |
8667 | ||
8668 | Location loc = this->location(); | |
8669 | ||
8670 | const Expression_list* args = this->args(); | |
8671 | go_assert(args != NULL && !args->empty()); | |
8672 | ||
8673 | Type* slice_type = args->front()->type(); | |
8674 | go_assert(slice_type->is_slice_type()); | |
8675 | Type* element_type = slice_type->array_type()->element_type(); | |
8676 | ||
8677 | if (args->size() == 1) | |
8678 | { | |
8679 | // append(s) evaluates to s. | |
d3c55148 | 8680 | if (assign_lhs != NULL) |
8681 | return NULL; | |
321e5ad2 | 8682 | return args->front(); |
8683 | } | |
8684 | ||
8685 | Type* int_type = Type::lookup_integer_type("int"); | |
8686 | Type* uint_type = Type::lookup_integer_type("uint"); | |
8687 | ||
8688 | // Implementing | |
8689 | // append(s1, s2...) | |
8690 | // or | |
8691 | // append(s1, a1, a2, a3, ...) | |
8692 | ||
8693 | // s1tmp := s1 | |
8694 | Temporary_statement* s1tmp = Statement::make_temporary(NULL, args->front(), | |
8695 | loc); | |
8696 | inserter->insert(s1tmp); | |
8697 | ||
8698 | // l1tmp := len(s1tmp) | |
8699 | Named_object* lenfn = gogo->lookup_global("len"); | |
8700 | Expression* lenref = Expression::make_func_reference(lenfn, NULL, loc); | |
8701 | Expression_list* call_args = new Expression_list(); | |
8702 | call_args->push_back(Expression::make_temporary_reference(s1tmp, loc)); | |
8703 | Expression* len = Expression::make_call(lenref, call_args, false, loc); | |
8704 | gogo->lower_expression(function, inserter, &len); | |
8705 | gogo->flatten_expression(function, inserter, &len); | |
8706 | Temporary_statement* l1tmp = Statement::make_temporary(int_type, len, loc); | |
8707 | inserter->insert(l1tmp); | |
8708 | ||
8709 | Temporary_statement* s2tmp = NULL; | |
8710 | Temporary_statement* l2tmp = NULL; | |
8711 | Expression_list* add = NULL; | |
8712 | Expression* len2; | |
38ba9eec | 8713 | Call_expression* makecall = NULL; |
321e5ad2 | 8714 | if (this->is_varargs()) |
8715 | { | |
8716 | go_assert(args->size() == 2); | |
8717 | ||
38ba9eec | 8718 | std::pair<Call_expression*, Temporary_statement*> p = |
8719 | Expression::find_makeslice_call(args->back()); | |
8720 | makecall = p.first; | |
8721 | if (makecall != NULL) | |
8722 | { | |
8723 | // We are handling | |
8724 | // append(s, make([]T, len[, cap])...)) | |
8725 | // which has already been lowered to | |
8726 | // append(s, runtime.makeslice(T, len, cap)). | |
8727 | // We will optimize this to directly zeroing the tail, | |
8728 | // instead of allocating a new slice then copy. | |
8729 | ||
8730 | // Retrieve the length. Cannot reference s2 as we will remove | |
8731 | // the makeslice call. | |
8732 | Expression* len_arg = makecall->args()->at(1); | |
8733 | len_arg = Expression::make_cast(int_type, len_arg, loc); | |
8734 | l2tmp = Statement::make_temporary(int_type, len_arg, loc); | |
8735 | inserter->insert(l2tmp); | |
8736 | ||
8737 | Expression* cap_arg = makecall->args()->at(2); | |
8738 | cap_arg = Expression::make_cast(int_type, cap_arg, loc); | |
8739 | Temporary_statement* c2tmp = | |
8740 | Statement::make_temporary(int_type, cap_arg, loc); | |
8741 | inserter->insert(c2tmp); | |
8742 | ||
8743 | // Check bad len/cap here. | |
8744 | // if len2 < 0 { panicmakeslicelen(); } | |
8745 | len2 = Expression::make_temporary_reference(l2tmp, loc); | |
8746 | Expression* zero = Expression::make_integer_ul(0, int_type, loc); | |
8747 | Expression* cond = Expression::make_binary(OPERATOR_LT, len2, | |
8748 | zero, loc); | |
8749 | Expression* arg = | |
8750 | Expression::make_integer_ul(RUNTIME_ERROR_MAKE_SLICE_LEN_OUT_OF_BOUNDS, | |
8751 | NULL, loc); | |
8752 | Expression* call = Runtime::make_call(Runtime::RUNTIME_ERROR, | |
8753 | loc, 1, arg); | |
8754 | cond = Expression::make_conditional(cond, call, zero->copy(), loc); | |
8755 | gogo->lower_expression(function, inserter, &cond); | |
8756 | gogo->flatten_expression(function, inserter, &cond); | |
8757 | Statement* s = Statement::make_statement(cond, false); | |
8758 | inserter->insert(s); | |
8759 | ||
8760 | // if cap2 < 0 { panicmakeslicecap(); } | |
8761 | Expression* cap2 = Expression::make_temporary_reference(c2tmp, loc); | |
8762 | cond = Expression::make_binary(OPERATOR_LT, cap2, | |
8763 | zero->copy(), loc); | |
8764 | arg = Expression::make_integer_ul(RUNTIME_ERROR_MAKE_SLICE_CAP_OUT_OF_BOUNDS, | |
8765 | NULL, loc); | |
8766 | call = Runtime::make_call(Runtime::RUNTIME_ERROR, loc, 1, arg); | |
8767 | cond = Expression::make_conditional(cond, call, zero->copy(), loc); | |
8768 | gogo->lower_expression(function, inserter, &cond); | |
8769 | gogo->flatten_expression(function, inserter, &cond); | |
8770 | s = Statement::make_statement(cond, false); | |
8771 | inserter->insert(s); | |
8772 | ||
8773 | // Remove the original makeslice call. | |
8774 | Temporary_statement* ts = p.second; | |
8775 | if (ts != NULL && ts->uses() == 1) | |
8776 | ts->set_init(Expression::make_nil(loc)); | |
8777 | } | |
8778 | else | |
8779 | { | |
8780 | // s2tmp := s2 | |
8781 | s2tmp = Statement::make_temporary(NULL, args->back(), loc); | |
8782 | inserter->insert(s2tmp); | |
321e5ad2 | 8783 | |
38ba9eec | 8784 | // l2tmp := len(s2tmp) |
8785 | lenref = Expression::make_func_reference(lenfn, NULL, loc); | |
8786 | call_args = new Expression_list(); | |
8787 | call_args->push_back(Expression::make_temporary_reference(s2tmp, loc)); | |
8788 | len = Expression::make_call(lenref, call_args, false, loc); | |
8789 | gogo->lower_expression(function, inserter, &len); | |
8790 | gogo->flatten_expression(function, inserter, &len); | |
8791 | l2tmp = Statement::make_temporary(int_type, len, loc); | |
8792 | inserter->insert(l2tmp); | |
8793 | } | |
321e5ad2 | 8794 | |
8795 | // len2 = l2tmp | |
8796 | len2 = Expression::make_temporary_reference(l2tmp, loc); | |
8797 | } | |
8798 | else | |
8799 | { | |
8800 | // We have to ensure that all the arguments are in variables | |
8801 | // now, because otherwise if one of them is an index expression | |
8802 | // into the current slice we could overwrite it before we fetch | |
8803 | // it. | |
8804 | add = new Expression_list(); | |
8805 | Expression_list::const_iterator pa = args->begin(); | |
8806 | for (++pa; pa != args->end(); ++pa) | |
8807 | { | |
8808 | if ((*pa)->is_variable()) | |
8809 | add->push_back(*pa); | |
8810 | else | |
8811 | { | |
8812 | Temporary_statement* tmp = Statement::make_temporary(NULL, *pa, | |
8813 | loc); | |
8814 | inserter->insert(tmp); | |
8815 | add->push_back(Expression::make_temporary_reference(tmp, loc)); | |
8816 | } | |
8817 | } | |
8818 | ||
8819 | // len2 = len(add) | |
8820 | len2 = Expression::make_integer_ul(add->size(), int_type, loc); | |
8821 | } | |
8822 | ||
8823 | // ntmp := l1tmp + len2 | |
8824 | Expression* ref = Expression::make_temporary_reference(l1tmp, loc); | |
8825 | Expression* sum = Expression::make_binary(OPERATOR_PLUS, ref, len2, loc); | |
8826 | gogo->lower_expression(function, inserter, &sum); | |
8827 | gogo->flatten_expression(function, inserter, &sum); | |
8828 | Temporary_statement* ntmp = Statement::make_temporary(int_type, sum, loc); | |
8829 | inserter->insert(ntmp); | |
8830 | ||
8831 | // s1tmp = uint(ntmp) > uint(cap(s1tmp)) ? | |
8832 | // growslice(type, s1tmp, ntmp) : | |
8833 | // s1tmp[:ntmp] | |
8834 | // Using uint here means that if the computation of ntmp overflowed, | |
8835 | // we will call growslice which will panic. | |
8836 | ||
321e5ad2 | 8837 | Named_object* capfn = gogo->lookup_global("cap"); |
8838 | Expression* capref = Expression::make_func_reference(capfn, NULL, loc); | |
8839 | call_args = new Expression_list(); | |
8840 | call_args->push_back(Expression::make_temporary_reference(s1tmp, loc)); | |
16c9b8e5 | 8841 | Expression* cap = Expression::make_call(capref, call_args, false, loc); |
8842 | gogo->lower_expression(function, inserter, &cap); | |
8843 | gogo->flatten_expression(function, inserter, &cap); | |
8844 | Temporary_statement* c1tmp = Statement::make_temporary(int_type, cap, loc); | |
8845 | inserter->insert(c1tmp); | |
8846 | ||
8847 | Expression* left = Expression::make_temporary_reference(ntmp, loc); | |
8848 | left = Expression::make_cast(uint_type, left, loc); | |
8849 | Expression* right = Expression::make_temporary_reference(c1tmp, loc); | |
321e5ad2 | 8850 | right = Expression::make_cast(uint_type, right, loc); |
8851 | ||
8852 | Expression* cond = Expression::make_binary(OPERATOR_GT, left, right, loc); | |
8853 | ||
16c9b8e5 | 8854 | Type* unsafe_ptr_type = Type::make_pointer_type(Type::make_void_type()); |
321e5ad2 | 8855 | Expression* a1 = Expression::make_type_descriptor(element_type, loc); |
8856 | Expression* a2 = Expression::make_temporary_reference(s1tmp, loc); | |
16c9b8e5 | 8857 | a2 = slice_type->array_type()->get_value_pointer(gogo, a2, false); |
8858 | a2 = Expression::make_cast(unsafe_ptr_type, a2, loc); | |
8859 | Expression* a3 = Expression::make_temporary_reference(l1tmp, loc); | |
8860 | Expression* a4 = Expression::make_temporary_reference(c1tmp, loc); | |
8861 | Expression* a5 = Expression::make_temporary_reference(ntmp, loc); | |
8862 | Expression* call = Runtime::make_call(Runtime::GROWSLICE, loc, 5, | |
8863 | a1, a2, a3, a4, a5); | |
321e5ad2 | 8864 | call = Expression::make_unsafe_cast(slice_type, call, loc); |
8865 | ||
8866 | ref = Expression::make_temporary_reference(s1tmp, loc); | |
8867 | Expression* zero = Expression::make_integer_ul(0, int_type, loc); | |
8868 | Expression* ref2 = Expression::make_temporary_reference(ntmp, loc); | |
3d135120 | 8869 | ref = Expression::make_array_index(ref, zero, ref2, NULL, loc); |
8870 | ref->array_index_expression()->set_needs_bounds_check(false); | |
321e5ad2 | 8871 | |
d3c55148 | 8872 | if (assign_lhs == NULL) |
8873 | { | |
8874 | Expression* rhs = Expression::make_conditional(cond, call, ref, loc); | |
8875 | ||
8876 | gogo->lower_expression(function, inserter, &rhs); | |
8877 | gogo->flatten_expression(function, inserter, &rhs); | |
8878 | ||
8879 | ref = Expression::make_temporary_reference(s1tmp, loc); | |
8880 | Statement* assign = Statement::make_assignment(ref, rhs, loc); | |
8881 | inserter->insert(assign); | |
8882 | } | |
8883 | else | |
8884 | { | |
8885 | gogo->lower_expression(function, inserter, &cond); | |
8886 | gogo->flatten_expression(function, inserter, &cond); | |
8887 | gogo->lower_expression(function, inserter, &call); | |
8888 | gogo->flatten_expression(function, inserter, &call); | |
8889 | gogo->lower_expression(function, inserter, &ref); | |
8890 | gogo->flatten_expression(function, inserter, &ref); | |
8891 | ||
8892 | Block* then_block = new Block(enclosing, loc); | |
8893 | Assignment_statement* assign = | |
8894 | Statement::make_assignment(assign_lhs, call, loc); | |
8895 | then_block->add_statement(assign); | |
321e5ad2 | 8896 | |
d3c55148 | 8897 | Block* else_block = new Block(enclosing, loc); |
8898 | assign = Statement::make_assignment(assign_lhs->copy(), ref, loc); | |
8899 | // This assignment will not change the pointer value, so it does | |
8900 | // not need a write barrier. | |
8901 | assign->set_omit_write_barrier(); | |
8902 | else_block->add_statement(assign); | |
321e5ad2 | 8903 | |
d3c55148 | 8904 | Statement* s = Statement::make_if_statement(cond, then_block, |
8905 | else_block, loc); | |
8906 | inserter->insert(s); | |
8907 | ||
8908 | ref = Expression::make_temporary_reference(s1tmp, loc); | |
8909 | assign = Statement::make_assignment(ref, assign_lhs->copy(), loc); | |
8910 | inserter->insert(assign); | |
8911 | } | |
321e5ad2 | 8912 | |
38ba9eec | 8913 | Type* uintptr_type = Type::lookup_integer_type("uintptr"); |
8914 | ||
321e5ad2 | 8915 | if (this->is_varargs()) |
8916 | { | |
38ba9eec | 8917 | if (makecall != NULL) |
7fdb0876 | 8918 | { |
38ba9eec | 8919 | // memclr(&s1tmp[l1tmp], l2tmp*sizeof(elem)) |
7fdb0876 | 8920 | a1 = Expression::make_temporary_reference(s1tmp, loc); |
8921 | ref = Expression::make_temporary_reference(l1tmp, loc); | |
8922 | a1 = Expression::make_array_index(a1, ref, NULL, NULL, loc); | |
8923 | a1->array_index_expression()->set_needs_bounds_check(false); | |
8924 | a1 = Expression::make_unary(OPERATOR_AND, a1, loc); | |
8925 | ||
7fdb0876 | 8926 | ref = Expression::make_temporary_reference(l2tmp, loc); |
8927 | ref = Expression::make_cast(uintptr_type, ref, loc); | |
38ba9eec | 8928 | a2 = Expression::make_type_info(element_type, TYPE_INFO_SIZE); |
8929 | a2 = Expression::make_binary(OPERATOR_MULT, a2, ref, loc); | |
7fdb0876 | 8930 | |
07ccb2ee | 8931 | if (element_type->has_pointer()) |
8932 | call = Runtime::make_call(Runtime::MEMCLRHASPTR, loc, 2, a1, a2); | |
8933 | else | |
8934 | { | |
8935 | Type* int32_type = Type::lookup_integer_type("int32"); | |
8936 | Expression* zero = | |
8937 | Expression::make_integer_ul(0, int32_type, loc); | |
8938 | call = Runtime::make_call(Runtime::BUILTIN_MEMSET, loc, 3, a1, | |
8939 | zero, a2); | |
8940 | } | |
38ba9eec | 8941 | |
8942 | if (element_type->has_pointer()) | |
8943 | { | |
8944 | // For a slice containing pointers, growslice already zeroed | |
8945 | // the memory. We only need to zero in non-growing case. | |
8946 | // Note: growslice does not zero the memory in non-pointer case. | |
8947 | Expression* left = | |
8948 | Expression::make_temporary_reference(ntmp, loc); | |
8949 | left = Expression::make_cast(uint_type, left, loc); | |
8950 | Expression* right = | |
8951 | Expression::make_temporary_reference(c1tmp, loc); | |
8952 | right = Expression::make_cast(uint_type, right, loc); | |
8953 | Expression* cond = | |
8954 | Expression::make_binary(OPERATOR_GT, left, right, loc); | |
8955 | Expression* zero = Expression::make_integer_ul(0, int_type, loc); | |
8956 | call = Expression::make_conditional(cond, call, zero, loc); | |
8957 | } | |
8958 | } | |
8959 | else | |
8960 | { | |
8961 | if (element_type->has_pointer()) | |
8962 | { | |
8963 | // copy(s1tmp[l1tmp:], s2tmp) | |
8964 | a1 = Expression::make_temporary_reference(s1tmp, loc); | |
8965 | ref = Expression::make_temporary_reference(l1tmp, loc); | |
8966 | Expression* nil = Expression::make_nil(loc); | |
8967 | a1 = Expression::make_array_index(a1, ref, nil, NULL, loc); | |
8968 | a1->array_index_expression()->set_needs_bounds_check(false); | |
8969 | ||
8970 | a2 = Expression::make_temporary_reference(s2tmp, loc); | |
8971 | ||
8972 | Named_object* copyfn = gogo->lookup_global("copy"); | |
8973 | Expression* copyref = Expression::make_func_reference(copyfn, NULL, loc); | |
8974 | call_args = new Expression_list(); | |
8975 | call_args->push_back(a1); | |
8976 | call_args->push_back(a2); | |
8977 | call = Expression::make_call(copyref, call_args, false, loc); | |
8978 | } | |
8979 | else | |
8980 | { | |
8981 | // memmove(&s1tmp[l1tmp], s2tmp.ptr, l2tmp*sizeof(elem)) | |
8982 | a1 = Expression::make_temporary_reference(s1tmp, loc); | |
8983 | ref = Expression::make_temporary_reference(l1tmp, loc); | |
8984 | a1 = Expression::make_array_index(a1, ref, NULL, NULL, loc); | |
8985 | a1->array_index_expression()->set_needs_bounds_check(false); | |
8986 | a1 = Expression::make_unary(OPERATOR_AND, a1, loc); | |
8987 | ||
8988 | a2 = Expression::make_temporary_reference(s2tmp, loc); | |
8989 | a2 = (a2->type()->is_string_type() | |
8990 | ? Expression::make_string_info(a2, | |
8991 | STRING_INFO_DATA, | |
8992 | loc) | |
8993 | : Expression::make_slice_info(a2, | |
8994 | SLICE_INFO_VALUE_POINTER, | |
8995 | loc)); | |
8996 | ||
8997 | ref = Expression::make_temporary_reference(l2tmp, loc); | |
8998 | ref = Expression::make_cast(uintptr_type, ref, loc); | |
8999 | a3 = Expression::make_type_info(element_type, TYPE_INFO_SIZE); | |
9000 | a3 = Expression::make_binary(OPERATOR_MULT, a3, ref, loc); | |
9001 | ||
9002 | call = Runtime::make_call(Runtime::BUILTIN_MEMMOVE, loc, 3, | |
9003 | a1, a2, a3); | |
9004 | } | |
7fdb0876 | 9005 | } |
321e5ad2 | 9006 | gogo->lower_expression(function, inserter, &call); |
9007 | gogo->flatten_expression(function, inserter, &call); | |
9008 | inserter->insert(Statement::make_statement(call, false)); | |
9009 | } | |
9010 | else | |
9011 | { | |
9012 | // For each argument: | |
9013 | // s1tmp[l1tmp+i] = a | |
9014 | unsigned long i = 0; | |
9015 | for (Expression_list::const_iterator pa = add->begin(); | |
9016 | pa != add->end(); | |
9017 | ++pa, ++i) | |
9018 | { | |
9019 | ref = Expression::make_temporary_reference(s1tmp, loc); | |
9020 | ref2 = Expression::make_temporary_reference(l1tmp, loc); | |
9021 | Expression* off = Expression::make_integer_ul(i, int_type, loc); | |
9022 | ref2 = Expression::make_binary(OPERATOR_PLUS, ref2, off, loc); | |
3d135120 | 9023 | Expression* lhs = Expression::make_array_index(ref, ref2, NULL, |
9024 | NULL, loc); | |
9025 | lhs->array_index_expression()->set_needs_bounds_check(false); | |
321e5ad2 | 9026 | gogo->lower_expression(function, inserter, &lhs); |
9027 | gogo->flatten_expression(function, inserter, &lhs); | |
e007b1eb | 9028 | Expression* elem = *pa; |
9029 | if (!Type::are_identical(element_type, elem->type(), 0, NULL) | |
9030 | && element_type->interface_type() != NULL) | |
9031 | elem = Expression::make_cast(element_type, elem, loc); | |
03118c21 | 9032 | // The flatten pass runs after the write barrier pass, so we |
9033 | // need to insert a write barrier here if necessary. | |
d3c55148 | 9034 | // However, if ASSIGN_LHS is not NULL, we have been called |
9035 | // directly before the write barrier pass. | |
9036 | Statement* assign; | |
9037 | if (assign_lhs != NULL | |
9038 | || !gogo->assign_needs_write_barrier(lhs)) | |
e007b1eb | 9039 | assign = Statement::make_assignment(lhs, elem, loc); |
03118c21 | 9040 | else |
9041 | { | |
9042 | Function* f = function == NULL ? NULL : function->func_value(); | |
9043 | assign = gogo->assign_with_write_barrier(f, NULL, inserter, | |
e007b1eb | 9044 | lhs, elem, loc); |
03118c21 | 9045 | } |
321e5ad2 | 9046 | inserter->insert(assign); |
9047 | } | |
9048 | } | |
9049 | ||
d3c55148 | 9050 | if (assign_lhs != NULL) |
9051 | return NULL; | |
9052 | ||
321e5ad2 | 9053 | return Expression::make_temporary_reference(s1tmp, loc); |
9054 | } | |
9055 | ||
a9182619 | 9056 | // Return whether an expression has an integer value. Report an error |
9057 | // if not. This is used when handling calls to the predeclared make | |
ccea2b36 | 9058 | // function. Set *SMALL if the value is known to fit in type "int". |
a9182619 | 9059 | |
9060 | bool | |
ccea2b36 | 9061 | Builtin_call_expression::check_int_value(Expression* e, bool is_length, |
9062 | bool *small) | |
a9182619 | 9063 | { |
ccea2b36 | 9064 | *small = false; |
9065 | ||
0c77715b | 9066 | Numeric_constant nc; |
1ad00fd4 | 9067 | if (e->numeric_constant_value(&nc)) |
a9182619 | 9068 | { |
1ad00fd4 | 9069 | unsigned long v; |
9070 | switch (nc.to_unsigned_long(&v)) | |
9071 | { | |
9072 | case Numeric_constant::NC_UL_VALID: | |
1b10c5e7 | 9073 | break; |
1ad00fd4 | 9074 | case Numeric_constant::NC_UL_NOTINT: |
631d5788 | 9075 | go_error_at(e->location(), "non-integer %s argument to make", |
9076 | is_length ? "len" : "cap"); | |
1ad00fd4 | 9077 | return false; |
9078 | case Numeric_constant::NC_UL_NEGATIVE: | |
631d5788 | 9079 | go_error_at(e->location(), "negative %s argument to make", |
9080 | is_length ? "len" : "cap"); | |
1ad00fd4 | 9081 | return false; |
9082 | case Numeric_constant::NC_UL_BIG: | |
9083 | // We don't want to give a compile-time error for a 64-bit | |
9084 | // value on a 32-bit target. | |
1b10c5e7 | 9085 | break; |
1ad00fd4 | 9086 | } |
1b10c5e7 | 9087 | |
9088 | mpz_t val; | |
9089 | if (!nc.to_int(&val)) | |
9090 | go_unreachable(); | |
9091 | int bits = mpz_sizeinbase(val, 2); | |
9092 | mpz_clear(val); | |
9093 | Type* int_type = Type::lookup_integer_type("int"); | |
9094 | if (bits >= int_type->integer_type()->bits()) | |
9095 | { | |
631d5788 | 9096 | go_error_at(e->location(), "%s argument too large for make", |
9097 | is_length ? "len" : "cap"); | |
1b10c5e7 | 9098 | return false; |
9099 | } | |
9100 | ||
ccea2b36 | 9101 | *small = true; |
1b10c5e7 | 9102 | return true; |
a9182619 | 9103 | } |
9104 | ||
1ad00fd4 | 9105 | if (e->type()->integer_type() != NULL) |
ccea2b36 | 9106 | { |
9107 | int ebits = e->type()->integer_type()->bits(); | |
9108 | int intbits = Type::lookup_integer_type("int")->integer_type()->bits(); | |
9109 | ||
9110 | // We can treat ebits == intbits as small even for an unsigned | |
9111 | // integer type, because we will convert the value to int and | |
9112 | // then reject it in the runtime if it is negative. | |
9113 | *small = ebits <= intbits; | |
9114 | ||
9115 | return true; | |
9116 | } | |
1ad00fd4 | 9117 | |
631d5788 | 9118 | go_error_at(e->location(), "non-integer %s argument to make", |
9119 | is_length ? "len" : "cap"); | |
a9182619 | 9120 | return false; |
9121 | } | |
9122 | ||
e440a328 | 9123 | // Return the type of the real or imag functions, given the type of |
fcbea5e4 | 9124 | // the argument. We need to map complex64 to float32 and complex128 |
9125 | // to float64, so it has to be done by name. This returns NULL if it | |
9126 | // can't figure out the type. | |
e440a328 | 9127 | |
9128 | Type* | |
9129 | Builtin_call_expression::real_imag_type(Type* arg_type) | |
9130 | { | |
9131 | if (arg_type == NULL || arg_type->is_abstract()) | |
9132 | return NULL; | |
9133 | Named_type* nt = arg_type->named_type(); | |
9134 | if (nt == NULL) | |
9135 | return NULL; | |
9136 | while (nt->real_type()->named_type() != NULL) | |
9137 | nt = nt->real_type()->named_type(); | |
48080209 | 9138 | if (nt->name() == "complex64") |
e440a328 | 9139 | return Type::lookup_float_type("float32"); |
9140 | else if (nt->name() == "complex128") | |
9141 | return Type::lookup_float_type("float64"); | |
9142 | else | |
9143 | return NULL; | |
9144 | } | |
9145 | ||
48080209 | 9146 | // Return the type of the complex function, given the type of one of the |
e440a328 | 9147 | // argments. Like real_imag_type, we have to map by name. |
9148 | ||
9149 | Type* | |
48080209 | 9150 | Builtin_call_expression::complex_type(Type* arg_type) |
e440a328 | 9151 | { |
9152 | if (arg_type == NULL || arg_type->is_abstract()) | |
9153 | return NULL; | |
9154 | Named_type* nt = arg_type->named_type(); | |
9155 | if (nt == NULL) | |
9156 | return NULL; | |
9157 | while (nt->real_type()->named_type() != NULL) | |
9158 | nt = nt->real_type()->named_type(); | |
48080209 | 9159 | if (nt->name() == "float32") |
e440a328 | 9160 | return Type::lookup_complex_type("complex64"); |
9161 | else if (nt->name() == "float64") | |
9162 | return Type::lookup_complex_type("complex128"); | |
9163 | else | |
9164 | return NULL; | |
9165 | } | |
9166 | ||
9167 | // Return a single argument, or NULL if there isn't one. | |
9168 | ||
9169 | Expression* | |
9170 | Builtin_call_expression::one_arg() const | |
9171 | { | |
9172 | const Expression_list* args = this->args(); | |
aa615cb3 | 9173 | if (args == NULL || args->size() != 1) |
e440a328 | 9174 | return NULL; |
9175 | return args->front(); | |
9176 | } | |
9177 | ||
83921647 | 9178 | // A traversal class which looks for a call or receive expression. |
9179 | ||
9180 | class Find_call_expression : public Traverse | |
9181 | { | |
9182 | public: | |
9183 | Find_call_expression() | |
9184 | : Traverse(traverse_expressions), | |
9185 | found_(false) | |
9186 | { } | |
9187 | ||
9188 | int | |
9189 | expression(Expression**); | |
9190 | ||
9191 | bool | |
9192 | found() | |
9193 | { return this->found_; } | |
9194 | ||
9195 | private: | |
9196 | bool found_; | |
9197 | }; | |
9198 | ||
9199 | int | |
9200 | Find_call_expression::expression(Expression** pexpr) | |
9201 | { | |
4714afb2 | 9202 | Expression* expr = *pexpr; |
9203 | if (!expr->is_constant() | |
9204 | && (expr->call_expression() != NULL | |
9205 | || expr->receive_expression() != NULL)) | |
83921647 | 9206 | { |
9207 | this->found_ = true; | |
9208 | return TRAVERSE_EXIT; | |
9209 | } | |
9210 | return TRAVERSE_CONTINUE; | |
9211 | } | |
9212 | ||
4714afb2 | 9213 | // Return whether calling len or cap on EXPR, of array type, is a |
9214 | // constant. The language spec says "the expressions len(s) and | |
9215 | // cap(s) are constants if the type of s is an array or pointer to an | |
9216 | // array and the expression s does not contain channel receives or | |
9217 | // (non-constant) function calls." | |
9218 | ||
9219 | bool | |
9220 | Builtin_call_expression::array_len_is_constant(Expression* expr) | |
9221 | { | |
9222 | go_assert(expr->type()->deref()->array_type() != NULL | |
9223 | && !expr->type()->deref()->is_slice_type()); | |
9224 | if (expr->is_constant()) | |
9225 | return true; | |
9226 | Find_call_expression find_call; | |
9227 | Expression::traverse(&expr, &find_call); | |
9228 | return !find_call.found(); | |
9229 | } | |
9230 | ||
83921647 | 9231 | // Return whether this is constant: len of a string constant, or len |
9232 | // or cap of an array, or unsafe.Sizeof, unsafe.Offsetof, | |
9233 | // unsafe.Alignof. | |
e440a328 | 9234 | |
9235 | bool | |
9236 | Builtin_call_expression::do_is_constant() const | |
9237 | { | |
12e69faa | 9238 | if (this->is_error_expression()) |
9239 | return true; | |
e440a328 | 9240 | switch (this->code_) |
9241 | { | |
9242 | case BUILTIN_LEN: | |
9243 | case BUILTIN_CAP: | |
9244 | { | |
0f914071 | 9245 | if (this->seen_) |
9246 | return false; | |
9247 | ||
e440a328 | 9248 | Expression* arg = this->one_arg(); |
9249 | if (arg == NULL) | |
9250 | return false; | |
9251 | Type* arg_type = arg->type(); | |
9252 | ||
9253 | if (arg_type->points_to() != NULL | |
9254 | && arg_type->points_to()->array_type() != NULL | |
411eb89e | 9255 | && !arg_type->points_to()->is_slice_type()) |
e440a328 | 9256 | arg_type = arg_type->points_to(); |
9257 | ||
9258 | if (arg_type->array_type() != NULL | |
54934d77 | 9259 | && arg_type->array_type()->length() != NULL) |
9260 | { | |
9261 | this->seen_ = true; | |
9262 | bool ret = Builtin_call_expression::array_len_is_constant(arg); | |
9263 | this->seen_ = false; | |
9264 | return ret; | |
9265 | } | |
e440a328 | 9266 | |
9267 | if (this->code_ == BUILTIN_LEN && arg_type->is_string_type()) | |
0f914071 | 9268 | { |
9269 | this->seen_ = true; | |
9270 | bool ret = arg->is_constant(); | |
9271 | this->seen_ = false; | |
9272 | return ret; | |
9273 | } | |
e440a328 | 9274 | } |
9275 | break; | |
9276 | ||
9277 | case BUILTIN_SIZEOF: | |
9278 | case BUILTIN_ALIGNOF: | |
9279 | return this->one_arg() != NULL; | |
9280 | ||
9281 | case BUILTIN_OFFSETOF: | |
9282 | { | |
9283 | Expression* arg = this->one_arg(); | |
9284 | if (arg == NULL) | |
9285 | return false; | |
9286 | return arg->field_reference_expression() != NULL; | |
9287 | } | |
9288 | ||
48080209 | 9289 | case BUILTIN_COMPLEX: |
e440a328 | 9290 | { |
9291 | const Expression_list* args = this->args(); | |
9292 | if (args != NULL && args->size() == 2) | |
9293 | return args->front()->is_constant() && args->back()->is_constant(); | |
9294 | } | |
9295 | break; | |
9296 | ||
9297 | case BUILTIN_REAL: | |
9298 | case BUILTIN_IMAG: | |
9299 | { | |
9300 | Expression* arg = this->one_arg(); | |
9301 | return arg != NULL && arg->is_constant(); | |
9302 | } | |
9303 | ||
9304 | default: | |
9305 | break; | |
9306 | } | |
9307 | ||
9308 | return false; | |
9309 | } | |
9310 | ||
0c77715b | 9311 | // Return a numeric constant if possible. |
e440a328 | 9312 | |
9313 | bool | |
0c77715b | 9314 | Builtin_call_expression::do_numeric_constant_value(Numeric_constant* nc) const |
e440a328 | 9315 | { |
9316 | if (this->code_ == BUILTIN_LEN | |
9317 | || this->code_ == BUILTIN_CAP) | |
9318 | { | |
9319 | Expression* arg = this->one_arg(); | |
9320 | if (arg == NULL) | |
9321 | return false; | |
9322 | Type* arg_type = arg->type(); | |
9323 | ||
9324 | if (this->code_ == BUILTIN_LEN && arg_type->is_string_type()) | |
9325 | { | |
9326 | std::string sval; | |
9327 | if (arg->string_constant_value(&sval)) | |
9328 | { | |
0c77715b | 9329 | nc->set_unsigned_long(Type::lookup_integer_type("int"), |
9330 | sval.length()); | |
e440a328 | 9331 | return true; |
9332 | } | |
9333 | } | |
9334 | ||
9335 | if (arg_type->points_to() != NULL | |
9336 | && arg_type->points_to()->array_type() != NULL | |
411eb89e | 9337 | && !arg_type->points_to()->is_slice_type()) |
e440a328 | 9338 | arg_type = arg_type->points_to(); |
9339 | ||
9340 | if (arg_type->array_type() != NULL | |
9341 | && arg_type->array_type()->length() != NULL) | |
9342 | { | |
0f914071 | 9343 | if (this->seen_) |
9344 | return false; | |
e440a328 | 9345 | Expression* e = arg_type->array_type()->length(); |
0f914071 | 9346 | this->seen_ = true; |
0c77715b | 9347 | bool r = e->numeric_constant_value(nc); |
0f914071 | 9348 | this->seen_ = false; |
9349 | if (r) | |
e440a328 | 9350 | { |
0c77715b | 9351 | if (!nc->set_type(Type::lookup_integer_type("int"), false, |
9352 | this->location())) | |
9353 | r = false; | |
e440a328 | 9354 | } |
0c77715b | 9355 | return r; |
e440a328 | 9356 | } |
9357 | } | |
9358 | else if (this->code_ == BUILTIN_SIZEOF | |
9359 | || this->code_ == BUILTIN_ALIGNOF) | |
9360 | { | |
9361 | Expression* arg = this->one_arg(); | |
9362 | if (arg == NULL) | |
9363 | return false; | |
9364 | Type* arg_type = arg->type(); | |
5c13bd80 | 9365 | if (arg_type->is_error()) |
e440a328 | 9366 | return false; |
9367 | if (arg_type->is_abstract()) | |
7200ac0e | 9368 | arg_type = arg_type->make_non_abstract_type(); |
2c809f8f | 9369 | if (this->seen_) |
9370 | return false; | |
927a01eb | 9371 | |
3f378015 | 9372 | int64_t ret; |
e440a328 | 9373 | if (this->code_ == BUILTIN_SIZEOF) |
9374 | { | |
2c809f8f | 9375 | this->seen_ = true; |
9376 | bool ok = arg_type->backend_type_size(this->gogo_, &ret); | |
9377 | this->seen_ = false; | |
9378 | if (!ok) | |
e440a328 | 9379 | return false; |
9380 | } | |
9381 | else if (this->code_ == BUILTIN_ALIGNOF) | |
9382 | { | |
2c809f8f | 9383 | bool ok; |
9384 | this->seen_ = true; | |
637bd3af | 9385 | if (arg->field_reference_expression() == NULL) |
2c809f8f | 9386 | ok = arg_type->backend_type_align(this->gogo_, &ret); |
637bd3af | 9387 | else |
e440a328 | 9388 | { |
9389 | // Calling unsafe.Alignof(s.f) returns the alignment of | |
9390 | // the type of f when it is used as a field in a struct. | |
2c809f8f | 9391 | ok = arg_type->backend_type_field_align(this->gogo_, &ret); |
e440a328 | 9392 | } |
2c809f8f | 9393 | this->seen_ = false; |
9394 | if (!ok) | |
9395 | return false; | |
e440a328 | 9396 | } |
9397 | else | |
c3e6f413 | 9398 | go_unreachable(); |
927a01eb | 9399 | |
3f378015 | 9400 | mpz_t zval; |
9401 | set_mpz_from_int64(&zval, ret); | |
9402 | nc->set_int(Type::lookup_integer_type("uintptr"), zval); | |
9403 | mpz_clear(zval); | |
e440a328 | 9404 | return true; |
9405 | } | |
9406 | else if (this->code_ == BUILTIN_OFFSETOF) | |
9407 | { | |
9408 | Expression* arg = this->one_arg(); | |
9409 | if (arg == NULL) | |
9410 | return false; | |
9411 | Field_reference_expression* farg = arg->field_reference_expression(); | |
9412 | if (farg == NULL) | |
9413 | return false; | |
2c809f8f | 9414 | if (this->seen_) |
9415 | return false; | |
9416 | ||
3f378015 | 9417 | int64_t total_offset = 0; |
9a4bd570 | 9418 | while (true) |
9419 | { | |
9420 | Expression* struct_expr = farg->expr(); | |
9421 | Type* st = struct_expr->type(); | |
9422 | if (st->struct_type() == NULL) | |
9423 | return false; | |
9424 | if (st->named_type() != NULL) | |
9425 | st->named_type()->convert(this->gogo_); | |
fbabafbd | 9426 | if (st->is_error_type()) |
9427 | { | |
9428 | go_assert(saw_errors()); | |
9429 | return false; | |
9430 | } | |
3f378015 | 9431 | int64_t offset; |
2c809f8f | 9432 | this->seen_ = true; |
9433 | bool ok = st->struct_type()->backend_field_offset(this->gogo_, | |
9434 | farg->field_index(), | |
9435 | &offset); | |
9436 | this->seen_ = false; | |
9437 | if (!ok) | |
9438 | return false; | |
9a4bd570 | 9439 | total_offset += offset; |
9440 | if (farg->implicit() && struct_expr->field_reference_expression() != NULL) | |
9441 | { | |
9442 | // Go up until we reach the original base. | |
9443 | farg = struct_expr->field_reference_expression(); | |
9444 | continue; | |
9445 | } | |
9446 | break; | |
9447 | } | |
3f378015 | 9448 | mpz_t zval; |
9449 | set_mpz_from_int64(&zval, total_offset); | |
9450 | nc->set_int(Type::lookup_integer_type("uintptr"), zval); | |
9451 | mpz_clear(zval); | |
e440a328 | 9452 | return true; |
9453 | } | |
0c77715b | 9454 | else if (this->code_ == BUILTIN_REAL || this->code_ == BUILTIN_IMAG) |
e440a328 | 9455 | { |
9456 | Expression* arg = this->one_arg(); | |
9457 | if (arg == NULL) | |
9458 | return false; | |
9459 | ||
0c77715b | 9460 | Numeric_constant argnc; |
9461 | if (!arg->numeric_constant_value(&argnc)) | |
9462 | return false; | |
9463 | ||
fcbea5e4 | 9464 | mpc_t val; |
9465 | if (!argnc.to_complex(&val)) | |
0c77715b | 9466 | return false; |
e440a328 | 9467 | |
0c77715b | 9468 | Type* type = Builtin_call_expression::real_imag_type(argnc.type()); |
9469 | if (this->code_ == BUILTIN_REAL) | |
fcbea5e4 | 9470 | nc->set_float(type, mpc_realref(val)); |
0c77715b | 9471 | else |
fcbea5e4 | 9472 | nc->set_float(type, mpc_imagref(val)); |
9473 | mpc_clear(val); | |
0c77715b | 9474 | return true; |
e440a328 | 9475 | } |
0c77715b | 9476 | else if (this->code_ == BUILTIN_COMPLEX) |
e440a328 | 9477 | { |
9478 | const Expression_list* args = this->args(); | |
9479 | if (args == NULL || args->size() != 2) | |
9480 | return false; | |
9481 | ||
0c77715b | 9482 | Numeric_constant rnc; |
9483 | if (!args->front()->numeric_constant_value(&rnc)) | |
9484 | return false; | |
9485 | Numeric_constant inc; | |
9486 | if (!args->back()->numeric_constant_value(&inc)) | |
9487 | return false; | |
9488 | ||
9489 | if (rnc.type() != NULL | |
9490 | && !rnc.type()->is_abstract() | |
9491 | && inc.type() != NULL | |
9492 | && !inc.type()->is_abstract() | |
3a522dcc | 9493 | && !Type::are_identical(rnc.type(), inc.type(), |
9494 | Type::COMPARE_ERRORS | Type::COMPARE_TAGS, | |
9495 | NULL)) | |
0c77715b | 9496 | return false; |
9497 | ||
e440a328 | 9498 | mpfr_t r; |
0c77715b | 9499 | if (!rnc.to_float(&r)) |
9500 | return false; | |
9501 | mpfr_t i; | |
9502 | if (!inc.to_float(&i)) | |
e440a328 | 9503 | { |
9504 | mpfr_clear(r); | |
9505 | return false; | |
9506 | } | |
9507 | ||
0c77715b | 9508 | Type* arg_type = rnc.type(); |
9509 | if (arg_type == NULL || arg_type->is_abstract()) | |
9510 | arg_type = inc.type(); | |
e440a328 | 9511 | |
fcbea5e4 | 9512 | mpc_t val; |
9513 | mpc_init2(val, mpc_precision); | |
9514 | mpc_set_fr_fr(val, r, i, MPC_RNDNN); | |
e440a328 | 9515 | mpfr_clear(r); |
9516 | mpfr_clear(i); | |
9517 | ||
fcbea5e4 | 9518 | Type* type = Builtin_call_expression::complex_type(arg_type); |
9519 | nc->set_complex(type, val); | |
9520 | ||
9521 | mpc_clear(val); | |
9522 | ||
0c77715b | 9523 | return true; |
e440a328 | 9524 | } |
9525 | ||
9526 | return false; | |
9527 | } | |
9528 | ||
a7549a6a | 9529 | // Give an error if we are discarding the value of an expression which |
9530 | // should not normally be discarded. We don't give an error for | |
9531 | // discarding the value of an ordinary function call, but we do for | |
9532 | // builtin functions, purely for consistency with the gc compiler. | |
9533 | ||
4f2138d7 | 9534 | bool |
a7549a6a | 9535 | Builtin_call_expression::do_discarding_value() |
9536 | { | |
9537 | switch (this->code_) | |
9538 | { | |
9539 | case BUILTIN_INVALID: | |
9540 | default: | |
9541 | go_unreachable(); | |
9542 | ||
9543 | case BUILTIN_APPEND: | |
9544 | case BUILTIN_CAP: | |
9545 | case BUILTIN_COMPLEX: | |
9546 | case BUILTIN_IMAG: | |
9547 | case BUILTIN_LEN: | |
9548 | case BUILTIN_MAKE: | |
9549 | case BUILTIN_NEW: | |
9550 | case BUILTIN_REAL: | |
9551 | case BUILTIN_ALIGNOF: | |
9552 | case BUILTIN_OFFSETOF: | |
9553 | case BUILTIN_SIZEOF: | |
9554 | this->unused_value_error(); | |
4f2138d7 | 9555 | return false; |
a7549a6a | 9556 | |
9557 | case BUILTIN_CLOSE: | |
9558 | case BUILTIN_COPY: | |
1cce762f | 9559 | case BUILTIN_DELETE: |
a7549a6a | 9560 | case BUILTIN_PANIC: |
9561 | case BUILTIN_PRINT: | |
9562 | case BUILTIN_PRINTLN: | |
9563 | case BUILTIN_RECOVER: | |
4f2138d7 | 9564 | return true; |
a7549a6a | 9565 | } |
9566 | } | |
9567 | ||
e440a328 | 9568 | // Return the type. |
9569 | ||
9570 | Type* | |
9571 | Builtin_call_expression::do_type() | |
9572 | { | |
79651b1f | 9573 | if (this->is_error_expression()) |
9574 | return Type::make_error_type(); | |
e440a328 | 9575 | switch (this->code_) |
9576 | { | |
9577 | case BUILTIN_INVALID: | |
9578 | default: | |
79651b1f | 9579 | return Type::make_error_type(); |
e440a328 | 9580 | |
9581 | case BUILTIN_NEW: | |
e440a328 | 9582 | { |
9583 | const Expression_list* args = this->args(); | |
9584 | if (args == NULL || args->empty()) | |
9585 | return Type::make_error_type(); | |
9586 | return Type::make_pointer_type(args->front()->type()); | |
9587 | } | |
9588 | ||
a065edc5 | 9589 | case BUILTIN_MAKE: |
9590 | { | |
9591 | const Expression_list* args = this->args(); | |
9592 | if (args == NULL || args->empty()) | |
9593 | return Type::make_error_type(); | |
9594 | return args->front()->type(); | |
9595 | } | |
9596 | ||
e440a328 | 9597 | case BUILTIN_CAP: |
9598 | case BUILTIN_COPY: | |
9599 | case BUILTIN_LEN: | |
7ba86326 | 9600 | return Type::lookup_integer_type("int"); |
9601 | ||
e440a328 | 9602 | case BUILTIN_ALIGNOF: |
9603 | case BUILTIN_OFFSETOF: | |
9604 | case BUILTIN_SIZEOF: | |
7ba86326 | 9605 | return Type::lookup_integer_type("uintptr"); |
e440a328 | 9606 | |
9607 | case BUILTIN_CLOSE: | |
1cce762f | 9608 | case BUILTIN_DELETE: |
e440a328 | 9609 | case BUILTIN_PANIC: |
9610 | case BUILTIN_PRINT: | |
9611 | case BUILTIN_PRINTLN: | |
9612 | return Type::make_void_type(); | |
9613 | ||
e440a328 | 9614 | case BUILTIN_RECOVER: |
823c7e3d | 9615 | return Type::make_empty_interface_type(Linemap::predeclared_location()); |
e440a328 | 9616 | |
9617 | case BUILTIN_APPEND: | |
9618 | { | |
9619 | const Expression_list* args = this->args(); | |
9620 | if (args == NULL || args->empty()) | |
9621 | return Type::make_error_type(); | |
3ff4863b | 9622 | Type *ret = args->front()->type(); |
9623 | if (!ret->is_slice_type()) | |
9624 | return Type::make_error_type(); | |
9625 | return ret; | |
e440a328 | 9626 | } |
9627 | ||
9628 | case BUILTIN_REAL: | |
9629 | case BUILTIN_IMAG: | |
9630 | { | |
9631 | Expression* arg = this->one_arg(); | |
9632 | if (arg == NULL) | |
9633 | return Type::make_error_type(); | |
9634 | Type* t = arg->type(); | |
9635 | if (t->is_abstract()) | |
9636 | t = t->make_non_abstract_type(); | |
9637 | t = Builtin_call_expression::real_imag_type(t); | |
9638 | if (t == NULL) | |
9639 | t = Type::make_error_type(); | |
9640 | return t; | |
9641 | } | |
9642 | ||
48080209 | 9643 | case BUILTIN_COMPLEX: |
e440a328 | 9644 | { |
9645 | const Expression_list* args = this->args(); | |
9646 | if (args == NULL || args->size() != 2) | |
9647 | return Type::make_error_type(); | |
9648 | Type* t = args->front()->type(); | |
9649 | if (t->is_abstract()) | |
9650 | { | |
9651 | t = args->back()->type(); | |
9652 | if (t->is_abstract()) | |
9653 | t = t->make_non_abstract_type(); | |
9654 | } | |
48080209 | 9655 | t = Builtin_call_expression::complex_type(t); |
e440a328 | 9656 | if (t == NULL) |
9657 | t = Type::make_error_type(); | |
9658 | return t; | |
9659 | } | |
9660 | } | |
9661 | } | |
9662 | ||
9663 | // Determine the type. | |
9664 | ||
9665 | void | |
9666 | Builtin_call_expression::do_determine_type(const Type_context* context) | |
9667 | { | |
fb94b0ca | 9668 | if (!this->determining_types()) |
9669 | return; | |
9670 | ||
e440a328 | 9671 | this->fn()->determine_type_no_context(); |
9672 | ||
9673 | const Expression_list* args = this->args(); | |
9674 | ||
9675 | bool is_print; | |
9676 | Type* arg_type = NULL; | |
321e5ad2 | 9677 | Type* trailing_arg_types = NULL; |
e440a328 | 9678 | switch (this->code_) |
9679 | { | |
9680 | case BUILTIN_PRINT: | |
9681 | case BUILTIN_PRINTLN: | |
9682 | // Do not force a large integer constant to "int". | |
9683 | is_print = true; | |
9684 | break; | |
9685 | ||
9686 | case BUILTIN_REAL: | |
9687 | case BUILTIN_IMAG: | |
48080209 | 9688 | arg_type = Builtin_call_expression::complex_type(context->type); |
f6bc81e6 | 9689 | if (arg_type == NULL) |
9690 | arg_type = Type::lookup_complex_type("complex128"); | |
e440a328 | 9691 | is_print = false; |
9692 | break; | |
9693 | ||
48080209 | 9694 | case BUILTIN_COMPLEX: |
e440a328 | 9695 | { |
48080209 | 9696 | // For the complex function the type of one operand can |
e440a328 | 9697 | // determine the type of the other, as in a binary expression. |
9698 | arg_type = Builtin_call_expression::real_imag_type(context->type); | |
f6bc81e6 | 9699 | if (arg_type == NULL) |
9700 | arg_type = Type::lookup_float_type("float64"); | |
e440a328 | 9701 | if (args != NULL && args->size() == 2) |
9702 | { | |
9703 | Type* t1 = args->front()->type(); | |
c849bb59 | 9704 | Type* t2 = args->back()->type(); |
e440a328 | 9705 | if (!t1->is_abstract()) |
9706 | arg_type = t1; | |
9707 | else if (!t2->is_abstract()) | |
9708 | arg_type = t2; | |
9709 | } | |
9710 | is_print = false; | |
9711 | } | |
9712 | break; | |
9713 | ||
321e5ad2 | 9714 | case BUILTIN_APPEND: |
9715 | if (!this->is_varargs() | |
9716 | && args != NULL | |
9717 | && !args->empty() | |
9718 | && args->front()->type()->is_slice_type()) | |
9719 | trailing_arg_types = | |
9720 | args->front()->type()->array_type()->element_type(); | |
9721 | is_print = false; | |
9722 | break; | |
9723 | ||
e440a328 | 9724 | default: |
9725 | is_print = false; | |
9726 | break; | |
9727 | } | |
9728 | ||
9729 | if (args != NULL) | |
9730 | { | |
9731 | for (Expression_list::const_iterator pa = args->begin(); | |
9732 | pa != args->end(); | |
9733 | ++pa) | |
9734 | { | |
9735 | Type_context subcontext; | |
9736 | subcontext.type = arg_type; | |
9737 | ||
9738 | if (is_print) | |
9739 | { | |
9740 | // We want to print large constants, we so can't just | |
9741 | // use the appropriate nonabstract type. Use uint64 for | |
9742 | // an integer if we know it is nonnegative, otherwise | |
9743 | // use int64 for a integer, otherwise use float64 for a | |
9744 | // float or complex128 for a complex. | |
9745 | Type* want_type = NULL; | |
9746 | Type* atype = (*pa)->type(); | |
9747 | if (atype->is_abstract()) | |
9748 | { | |
9749 | if (atype->integer_type() != NULL) | |
9750 | { | |
0c77715b | 9751 | Numeric_constant nc; |
9752 | if (this->numeric_constant_value(&nc)) | |
9753 | { | |
9754 | mpz_t val; | |
9755 | if (nc.to_int(&val)) | |
9756 | { | |
9757 | if (mpz_sgn(val) >= 0) | |
9758 | want_type = Type::lookup_integer_type("uint64"); | |
9759 | mpz_clear(val); | |
9760 | } | |
9761 | } | |
9762 | if (want_type == NULL) | |
e440a328 | 9763 | want_type = Type::lookup_integer_type("int64"); |
e440a328 | 9764 | } |
9765 | else if (atype->float_type() != NULL) | |
9766 | want_type = Type::lookup_float_type("float64"); | |
9767 | else if (atype->complex_type() != NULL) | |
9768 | want_type = Type::lookup_complex_type("complex128"); | |
9769 | else if (atype->is_abstract_string_type()) | |
9770 | want_type = Type::lookup_string_type(); | |
9771 | else if (atype->is_abstract_boolean_type()) | |
9772 | want_type = Type::lookup_bool_type(); | |
9773 | else | |
c3e6f413 | 9774 | go_unreachable(); |
e440a328 | 9775 | subcontext.type = want_type; |
9776 | } | |
9777 | } | |
9778 | ||
9779 | (*pa)->determine_type(&subcontext); | |
321e5ad2 | 9780 | |
9781 | if (trailing_arg_types != NULL) | |
9782 | { | |
9783 | arg_type = trailing_arg_types; | |
9784 | trailing_arg_types = NULL; | |
9785 | } | |
e440a328 | 9786 | } |
9787 | } | |
9788 | } | |
9789 | ||
9790 | // If there is exactly one argument, return true. Otherwise give an | |
9791 | // error message and return false. | |
9792 | ||
9793 | bool | |
9794 | Builtin_call_expression::check_one_arg() | |
9795 | { | |
9796 | const Expression_list* args = this->args(); | |
9797 | if (args == NULL || args->size() < 1) | |
9798 | { | |
9799 | this->report_error(_("not enough arguments")); | |
9800 | return false; | |
9801 | } | |
9802 | else if (args->size() > 1) | |
9803 | { | |
9804 | this->report_error(_("too many arguments")); | |
9805 | return false; | |
9806 | } | |
9807 | if (args->front()->is_error_expression() | |
5c13bd80 | 9808 | || args->front()->type()->is_error()) |
e440a328 | 9809 | { |
9810 | this->set_is_error(); | |
9811 | return false; | |
9812 | } | |
9813 | return true; | |
9814 | } | |
9815 | ||
9816 | // Check argument types for a builtin function. | |
9817 | ||
9818 | void | |
9819 | Builtin_call_expression::do_check_types(Gogo*) | |
9820 | { | |
375646ea | 9821 | if (this->is_error_expression()) |
9822 | return; | |
e440a328 | 9823 | switch (this->code_) |
9824 | { | |
9825 | case BUILTIN_INVALID: | |
9826 | case BUILTIN_NEW: | |
9827 | case BUILTIN_MAKE: | |
cd238b8d | 9828 | case BUILTIN_DELETE: |
e440a328 | 9829 | return; |
9830 | ||
9831 | case BUILTIN_LEN: | |
9832 | case BUILTIN_CAP: | |
9833 | { | |
9834 | // The single argument may be either a string or an array or a | |
9835 | // map or a channel, or a pointer to a closed array. | |
9836 | if (this->check_one_arg()) | |
9837 | { | |
9838 | Type* arg_type = this->one_arg()->type(); | |
9839 | if (arg_type->points_to() != NULL | |
9840 | && arg_type->points_to()->array_type() != NULL | |
411eb89e | 9841 | && !arg_type->points_to()->is_slice_type()) |
e440a328 | 9842 | arg_type = arg_type->points_to(); |
9843 | if (this->code_ == BUILTIN_CAP) | |
9844 | { | |
5c13bd80 | 9845 | if (!arg_type->is_error() |
e440a328 | 9846 | && arg_type->array_type() == NULL |
9847 | && arg_type->channel_type() == NULL) | |
9848 | this->report_error(_("argument must be array or slice " | |
9849 | "or channel")); | |
9850 | } | |
9851 | else | |
9852 | { | |
5c13bd80 | 9853 | if (!arg_type->is_error() |
e440a328 | 9854 | && !arg_type->is_string_type() |
9855 | && arg_type->array_type() == NULL | |
9856 | && arg_type->map_type() == NULL | |
9857 | && arg_type->channel_type() == NULL) | |
9858 | this->report_error(_("argument must be string or " | |
9859 | "array or slice or map or channel")); | |
9860 | } | |
9861 | } | |
9862 | } | |
9863 | break; | |
9864 | ||
9865 | case BUILTIN_PRINT: | |
9866 | case BUILTIN_PRINTLN: | |
9867 | { | |
9868 | const Expression_list* args = this->args(); | |
9869 | if (args == NULL) | |
9870 | { | |
9871 | if (this->code_ == BUILTIN_PRINT) | |
631d5788 | 9872 | go_warning_at(this->location(), 0, |
37423a84 | 9873 | "no arguments for built-in function %<%s%>", |
e440a328 | 9874 | (this->code_ == BUILTIN_PRINT |
9875 | ? "print" | |
9876 | : "println")); | |
9877 | } | |
9878 | else | |
9879 | { | |
9880 | for (Expression_list::const_iterator p = args->begin(); | |
9881 | p != args->end(); | |
9882 | ++p) | |
9883 | { | |
9884 | Type* type = (*p)->type(); | |
5c13bd80 | 9885 | if (type->is_error() |
e440a328 | 9886 | || type->is_string_type() |
9887 | || type->integer_type() != NULL | |
9888 | || type->float_type() != NULL | |
9889 | || type->complex_type() != NULL | |
9890 | || type->is_boolean_type() | |
9891 | || type->points_to() != NULL | |
9892 | || type->interface_type() != NULL | |
9893 | || type->channel_type() != NULL | |
9894 | || type->map_type() != NULL | |
9895 | || type->function_type() != NULL | |
411eb89e | 9896 | || type->is_slice_type()) |
e440a328 | 9897 | ; |
acf8e158 | 9898 | else if ((*p)->is_type_expression()) |
9899 | { | |
9900 | // If this is a type expression it's going to give | |
9901 | // an error anyhow, so we don't need one here. | |
9902 | } | |
e440a328 | 9903 | else |
9904 | this->report_error(_("unsupported argument type to " | |
9905 | "builtin function")); | |
9906 | } | |
9907 | } | |
9908 | } | |
9909 | break; | |
9910 | ||
9911 | case BUILTIN_CLOSE: | |
e440a328 | 9912 | if (this->check_one_arg()) |
9913 | { | |
9914 | if (this->one_arg()->type()->channel_type() == NULL) | |
9915 | this->report_error(_("argument must be channel")); | |
5202d986 | 9916 | else if (!this->one_arg()->type()->channel_type()->may_send()) |
9917 | this->report_error(_("cannot close receive-only channel")); | |
e440a328 | 9918 | } |
9919 | break; | |
9920 | ||
9921 | case BUILTIN_PANIC: | |
9922 | case BUILTIN_SIZEOF: | |
9923 | case BUILTIN_ALIGNOF: | |
9924 | this->check_one_arg(); | |
9925 | break; | |
9926 | ||
9927 | case BUILTIN_RECOVER: | |
6334270b | 9928 | if (this->args() != NULL |
9929 | && !this->args()->empty() | |
9930 | && !this->recover_arg_is_set_) | |
e440a328 | 9931 | this->report_error(_("too many arguments")); |
9932 | break; | |
9933 | ||
9934 | case BUILTIN_OFFSETOF: | |
9935 | if (this->check_one_arg()) | |
9936 | { | |
9937 | Expression* arg = this->one_arg(); | |
9938 | if (arg->field_reference_expression() == NULL) | |
9939 | this->report_error(_("argument must be a field reference")); | |
9940 | } | |
9941 | break; | |
9942 | ||
9943 | case BUILTIN_COPY: | |
9944 | { | |
9945 | const Expression_list* args = this->args(); | |
9946 | if (args == NULL || args->size() < 2) | |
9947 | { | |
9948 | this->report_error(_("not enough arguments")); | |
9949 | break; | |
9950 | } | |
9951 | else if (args->size() > 2) | |
9952 | { | |
9953 | this->report_error(_("too many arguments")); | |
9954 | break; | |
9955 | } | |
9956 | Type* arg1_type = args->front()->type(); | |
9957 | Type* arg2_type = args->back()->type(); | |
5c13bd80 | 9958 | if (arg1_type->is_error() || arg2_type->is_error()) |
6bebb39d | 9959 | { |
9960 | this->set_is_error(); | |
9961 | break; | |
9962 | } | |
e440a328 | 9963 | |
9964 | Type* e1; | |
411eb89e | 9965 | if (arg1_type->is_slice_type()) |
e440a328 | 9966 | e1 = arg1_type->array_type()->element_type(); |
9967 | else | |
9968 | { | |
9969 | this->report_error(_("left argument must be a slice")); | |
9970 | break; | |
9971 | } | |
9972 | ||
411eb89e | 9973 | if (arg2_type->is_slice_type()) |
60963afd | 9974 | { |
9975 | Type* e2 = arg2_type->array_type()->element_type(); | |
3a522dcc | 9976 | if (!Type::are_identical(e1, e2, Type::COMPARE_TAGS, NULL)) |
60963afd | 9977 | this->report_error(_("element types must be the same")); |
9978 | } | |
e440a328 | 9979 | else if (arg2_type->is_string_type()) |
e440a328 | 9980 | { |
60963afd | 9981 | if (e1->integer_type() == NULL || !e1->integer_type()->is_byte()) |
9982 | this->report_error(_("first argument must be []byte")); | |
e440a328 | 9983 | } |
60963afd | 9984 | else |
9985 | this->report_error(_("second argument must be slice or string")); | |
e440a328 | 9986 | } |
9987 | break; | |
9988 | ||
9989 | case BUILTIN_APPEND: | |
9990 | { | |
9991 | const Expression_list* args = this->args(); | |
321e5ad2 | 9992 | if (args == NULL || args->empty()) |
e440a328 | 9993 | { |
9994 | this->report_error(_("not enough arguments")); | |
9995 | break; | |
9996 | } | |
321e5ad2 | 9997 | |
9998 | Type* slice_type = args->front()->type(); | |
9999 | if (!slice_type->is_slice_type()) | |
6bebb39d | 10000 | { |
321e5ad2 | 10001 | if (slice_type->is_error_type()) |
10002 | break; | |
10003 | if (slice_type->is_nil_type()) | |
10004 | go_error_at(args->front()->location(), "use of untyped nil"); | |
10005 | else | |
10006 | go_error_at(args->front()->location(), | |
10007 | "argument 1 must be a slice"); | |
6bebb39d | 10008 | this->set_is_error(); |
10009 | break; | |
10010 | } | |
cd238b8d | 10011 | |
321e5ad2 | 10012 | Type* element_type = slice_type->array_type()->element_type(); |
22deed0d | 10013 | if (!element_type->in_heap()) |
10014 | go_error_at(args->front()->location(), | |
37423a84 | 10015 | "cannot append to slice of go:notinheap type"); |
321e5ad2 | 10016 | if (this->is_varargs()) |
4fd4fcf4 | 10017 | { |
321e5ad2 | 10018 | if (!args->back()->type()->is_slice_type() |
10019 | && !args->back()->type()->is_string_type()) | |
10020 | { | |
10021 | go_error_at(args->back()->location(), | |
10022 | "invalid use of %<...%> with non-slice/non-string"); | |
10023 | this->set_is_error(); | |
10024 | break; | |
10025 | } | |
4fd4fcf4 | 10026 | |
321e5ad2 | 10027 | if (args->size() < 2) |
10028 | { | |
10029 | this->report_error(_("not enough arguments")); | |
10030 | break; | |
10031 | } | |
10032 | if (args->size() > 2) | |
10033 | { | |
10034 | this->report_error(_("too many arguments")); | |
10035 | break; | |
10036 | } | |
10037 | ||
10038 | if (args->back()->type()->is_string_type() | |
10039 | && element_type->integer_type() != NULL | |
10040 | && element_type->integer_type()->is_byte()) | |
10041 | { | |
10042 | // Permit append(s1, s2...) when s1 is a slice of | |
10043 | // bytes and s2 is a string type. | |
10044 | } | |
e440a328 | 10045 | else |
10046 | { | |
321e5ad2 | 10047 | // We have to test for assignment compatibility to a |
10048 | // slice of the element type, which is not necessarily | |
10049 | // the same as the type of the first argument: the | |
10050 | // first argument might have a named type. | |
10051 | Type* check_type = Type::make_array_type(element_type, NULL); | |
10052 | std::string reason; | |
10053 | if (!Type::are_assignable(check_type, args->back()->type(), | |
10054 | &reason)) | |
10055 | { | |
10056 | if (reason.empty()) | |
10057 | go_error_at(args->back()->location(), | |
10058 | "argument 2 has invalid type"); | |
10059 | else | |
10060 | go_error_at(args->back()->location(), | |
10061 | "argument 2 has invalid type (%s)", | |
10062 | reason.c_str()); | |
10063 | this->set_is_error(); | |
10064 | break; | |
10065 | } | |
10066 | } | |
10067 | } | |
10068 | else | |
10069 | { | |
10070 | Expression_list::const_iterator pa = args->begin(); | |
10071 | int i = 2; | |
10072 | for (++pa; pa != args->end(); ++pa, ++i) | |
10073 | { | |
10074 | std::string reason; | |
10075 | if (!Type::are_assignable(element_type, (*pa)->type(), | |
10076 | &reason)) | |
10077 | { | |
10078 | if (reason.empty()) | |
10079 | go_error_at((*pa)->location(), | |
10080 | "argument %d has incompatible type", i); | |
10081 | else | |
10082 | go_error_at((*pa)->location(), | |
10083 | "argument %d has incompatible type (%s)", | |
10084 | i, reason.c_str()); | |
10085 | this->set_is_error(); | |
10086 | } | |
e440a328 | 10087 | } |
10088 | } | |
e440a328 | 10089 | } |
321e5ad2 | 10090 | break; |
e440a328 | 10091 | |
10092 | case BUILTIN_REAL: | |
10093 | case BUILTIN_IMAG: | |
10094 | if (this->check_one_arg()) | |
10095 | { | |
10096 | if (this->one_arg()->type()->complex_type() == NULL) | |
10097 | this->report_error(_("argument must have complex type")); | |
10098 | } | |
10099 | break; | |
10100 | ||
48080209 | 10101 | case BUILTIN_COMPLEX: |
e440a328 | 10102 | { |
10103 | const Expression_list* args = this->args(); | |
10104 | if (args == NULL || args->size() < 2) | |
10105 | this->report_error(_("not enough arguments")); | |
10106 | else if (args->size() > 2) | |
10107 | this->report_error(_("too many arguments")); | |
10108 | else if (args->front()->is_error_expression() | |
5c13bd80 | 10109 | || args->front()->type()->is_error() |
e440a328 | 10110 | || args->back()->is_error_expression() |
5c13bd80 | 10111 | || args->back()->type()->is_error()) |
e440a328 | 10112 | this->set_is_error(); |
10113 | else if (!Type::are_identical(args->front()->type(), | |
3a522dcc | 10114 | args->back()->type(), |
10115 | Type::COMPARE_TAGS, NULL)) | |
48080209 | 10116 | this->report_error(_("complex arguments must have identical types")); |
e440a328 | 10117 | else if (args->front()->type()->float_type() == NULL) |
48080209 | 10118 | this->report_error(_("complex arguments must have " |
e440a328 | 10119 | "floating-point type")); |
10120 | } | |
10121 | break; | |
10122 | ||
10123 | default: | |
c3e6f413 | 10124 | go_unreachable(); |
e440a328 | 10125 | } |
10126 | } | |
10127 | ||
72666aed | 10128 | Expression* |
10129 | Builtin_call_expression::do_copy() | |
10130 | { | |
10131 | Call_expression* bce = | |
10132 | new Builtin_call_expression(this->gogo_, this->fn()->copy(), | |
da244e59 | 10133 | (this->args() == NULL |
10134 | ? NULL | |
10135 | : this->args()->copy()), | |
72666aed | 10136 | this->is_varargs(), |
10137 | this->location()); | |
10138 | ||
10139 | if (this->varargs_are_lowered()) | |
10140 | bce->set_varargs_are_lowered(); | |
28819633 | 10141 | if (this->is_deferred()) |
10142 | bce->set_is_deferred(); | |
10143 | if (this->is_concurrent()) | |
10144 | bce->set_is_concurrent(); | |
72666aed | 10145 | return bce; |
10146 | } | |
10147 | ||
ea664253 | 10148 | // Return the backend representation for a builtin function. |
e440a328 | 10149 | |
ea664253 | 10150 | Bexpression* |
10151 | Builtin_call_expression::do_get_backend(Translate_context* context) | |
e440a328 | 10152 | { |
10153 | Gogo* gogo = context->gogo(); | |
b13c66cd | 10154 | Location location = this->location(); |
a0d8874e | 10155 | |
10156 | if (this->is_erroneous_call()) | |
10157 | { | |
10158 | go_assert(saw_errors()); | |
10159 | return gogo->backend()->error_expression(); | |
10160 | } | |
10161 | ||
e440a328 | 10162 | switch (this->code_) |
10163 | { | |
10164 | case BUILTIN_INVALID: | |
10165 | case BUILTIN_NEW: | |
10166 | case BUILTIN_MAKE: | |
c3e6f413 | 10167 | go_unreachable(); |
e440a328 | 10168 | |
10169 | case BUILTIN_LEN: | |
10170 | case BUILTIN_CAP: | |
10171 | { | |
10172 | const Expression_list* args = this->args(); | |
c484d925 | 10173 | go_assert(args != NULL && args->size() == 1); |
2c809f8f | 10174 | Expression* arg = args->front(); |
e440a328 | 10175 | Type* arg_type = arg->type(); |
0f914071 | 10176 | |
10177 | if (this->seen_) | |
10178 | { | |
c484d925 | 10179 | go_assert(saw_errors()); |
ea664253 | 10180 | return context->backend()->error_expression(); |
0f914071 | 10181 | } |
10182 | this->seen_ = true; | |
0f914071 | 10183 | this->seen_ = false; |
e440a328 | 10184 | if (arg_type->points_to() != NULL) |
10185 | { | |
10186 | arg_type = arg_type->points_to(); | |
c484d925 | 10187 | go_assert(arg_type->array_type() != NULL |
411eb89e | 10188 | && !arg_type->is_slice_type()); |
f614ea8b | 10189 | arg = Expression::make_dereference(arg, NIL_CHECK_DEFAULT, |
10190 | location); | |
e440a328 | 10191 | } |
10192 | ||
1b1f2abf | 10193 | Type* int_type = Type::lookup_integer_type("int"); |
2c809f8f | 10194 | Expression* val; |
e440a328 | 10195 | if (this->code_ == BUILTIN_LEN) |
10196 | { | |
10197 | if (arg_type->is_string_type()) | |
2c809f8f | 10198 | val = Expression::make_string_info(arg, STRING_INFO_LENGTH, |
10199 | location); | |
e440a328 | 10200 | else if (arg_type->array_type() != NULL) |
0f914071 | 10201 | { |
10202 | if (this->seen_) | |
10203 | { | |
c484d925 | 10204 | go_assert(saw_errors()); |
ea664253 | 10205 | return context->backend()->error_expression(); |
0f914071 | 10206 | } |
10207 | this->seen_ = true; | |
2c809f8f | 10208 | val = arg_type->array_type()->get_length(gogo, arg); |
0f914071 | 10209 | this->seen_ = false; |
10210 | } | |
0d5530d9 | 10211 | else if (arg_type->map_type() != NULL |
10212 | || arg_type->channel_type() != NULL) | |
10213 | { | |
10214 | // The first field is the length. If the pointer is | |
10215 | // nil, the length is zero. | |
10216 | Type* pint_type = Type::make_pointer_type(int_type); | |
10217 | arg = Expression::make_unsafe_cast(pint_type, arg, location); | |
10218 | Expression* nil = Expression::make_nil(location); | |
10219 | nil = Expression::make_cast(pint_type, nil, location); | |
10220 | Expression* cmp = Expression::make_binary(OPERATOR_EQEQ, | |
10221 | arg, nil, location); | |
10222 | Expression* zero = Expression::make_integer_ul(0, int_type, | |
10223 | location); | |
f614ea8b | 10224 | Expression* indir = |
10225 | Expression::make_dereference(arg, NIL_CHECK_NOT_NEEDED, | |
10226 | location); | |
0d5530d9 | 10227 | val = Expression::make_conditional(cmp, zero, indir, location); |
10228 | } | |
e440a328 | 10229 | else |
c3e6f413 | 10230 | go_unreachable(); |
e440a328 | 10231 | } |
10232 | else | |
10233 | { | |
10234 | if (arg_type->array_type() != NULL) | |
0f914071 | 10235 | { |
10236 | if (this->seen_) | |
10237 | { | |
c484d925 | 10238 | go_assert(saw_errors()); |
ea664253 | 10239 | return context->backend()->error_expression(); |
0f914071 | 10240 | } |
10241 | this->seen_ = true; | |
2c809f8f | 10242 | val = arg_type->array_type()->get_capacity(gogo, arg); |
0f914071 | 10243 | this->seen_ = false; |
10244 | } | |
e440a328 | 10245 | else if (arg_type->channel_type() != NULL) |
132ed071 | 10246 | { |
10247 | // The second field is the capacity. If the pointer | |
10248 | // is nil, the capacity is zero. | |
10249 | Type* uintptr_type = Type::lookup_integer_type("uintptr"); | |
10250 | Type* pint_type = Type::make_pointer_type(int_type); | |
10251 | Expression* parg = Expression::make_unsafe_cast(uintptr_type, | |
10252 | arg, | |
10253 | location); | |
10254 | int off = int_type->integer_type()->bits() / 8; | |
10255 | Expression* eoff = Expression::make_integer_ul(off, | |
10256 | uintptr_type, | |
10257 | location); | |
10258 | parg = Expression::make_binary(OPERATOR_PLUS, parg, eoff, | |
10259 | location); | |
10260 | parg = Expression::make_unsafe_cast(pint_type, parg, location); | |
10261 | Expression* nil = Expression::make_nil(location); | |
10262 | nil = Expression::make_cast(pint_type, nil, location); | |
10263 | Expression* cmp = Expression::make_binary(OPERATOR_EQEQ, | |
10264 | arg, nil, location); | |
10265 | Expression* zero = Expression::make_integer_ul(0, int_type, | |
10266 | location); | |
f614ea8b | 10267 | Expression* indir = |
10268 | Expression::make_dereference(parg, NIL_CHECK_NOT_NEEDED, | |
10269 | location); | |
132ed071 | 10270 | val = Expression::make_conditional(cmp, zero, indir, location); |
10271 | } | |
e440a328 | 10272 | else |
c3e6f413 | 10273 | go_unreachable(); |
e440a328 | 10274 | } |
10275 | ||
2c809f8f | 10276 | return Expression::make_cast(int_type, val, |
ea664253 | 10277 | location)->get_backend(context); |
e440a328 | 10278 | } |
10279 | ||
10280 | case BUILTIN_PRINT: | |
10281 | case BUILTIN_PRINTLN: | |
10282 | { | |
10283 | const bool is_ln = this->code_ == BUILTIN_PRINTLN; | |
88b03a70 | 10284 | |
10285 | Expression* print_stmts = Runtime::make_call(Runtime::PRINTLOCK, | |
10286 | location, 0); | |
e440a328 | 10287 | |
10288 | const Expression_list* call_args = this->args(); | |
10289 | if (call_args != NULL) | |
10290 | { | |
10291 | for (Expression_list::const_iterator p = call_args->begin(); | |
10292 | p != call_args->end(); | |
10293 | ++p) | |
10294 | { | |
10295 | if (is_ln && p != call_args->begin()) | |
10296 | { | |
2c809f8f | 10297 | Expression* print_space = |
88b03a70 | 10298 | Runtime::make_call(Runtime::PRINTSP, location, 0); |
e440a328 | 10299 | |
2c809f8f | 10300 | print_stmts = |
10301 | Expression::make_compound(print_stmts, print_space, | |
10302 | location); | |
10303 | } | |
e440a328 | 10304 | |
2c809f8f | 10305 | Expression* arg = *p; |
10306 | Type* type = arg->type(); | |
10307 | Runtime::Function code; | |
e440a328 | 10308 | if (type->is_string_type()) |
88b03a70 | 10309 | code = Runtime::PRINTSTRING; |
e440a328 | 10310 | else if (type->integer_type() != NULL |
10311 | && type->integer_type()->is_unsigned()) | |
10312 | { | |
e440a328 | 10313 | Type* itype = Type::lookup_integer_type("uint64"); |
2c809f8f | 10314 | arg = Expression::make_cast(itype, arg, location); |
32e9e3f2 | 10315 | if (gogo->compiling_runtime() |
10316 | && type->named_type() != NULL | |
10317 | && gogo->unpack_hidden_name(type->named_type()->name()) | |
10318 | == "hex") | |
10319 | code = Runtime::PRINTHEX; | |
10320 | else | |
10321 | code = Runtime::PRINTUINT; | |
e440a328 | 10322 | } |
10323 | else if (type->integer_type() != NULL) | |
10324 | { | |
e440a328 | 10325 | Type* itype = Type::lookup_integer_type("int64"); |
2c809f8f | 10326 | arg = Expression::make_cast(itype, arg, location); |
88b03a70 | 10327 | code = Runtime::PRINTINT; |
e440a328 | 10328 | } |
10329 | else if (type->float_type() != NULL) | |
10330 | { | |
2c809f8f | 10331 | Type* dtype = Type::lookup_float_type("float64"); |
10332 | arg = Expression::make_cast(dtype, arg, location); | |
88b03a70 | 10333 | code = Runtime::PRINTFLOAT; |
e440a328 | 10334 | } |
10335 | else if (type->complex_type() != NULL) | |
10336 | { | |
2c809f8f | 10337 | Type* ctype = Type::lookup_complex_type("complex128"); |
10338 | arg = Expression::make_cast(ctype, arg, location); | |
88b03a70 | 10339 | code = Runtime::PRINTCOMPLEX; |
e440a328 | 10340 | } |
10341 | else if (type->is_boolean_type()) | |
88b03a70 | 10342 | code = Runtime::PRINTBOOL; |
e440a328 | 10343 | else if (type->points_to() != NULL |
10344 | || type->channel_type() != NULL | |
10345 | || type->map_type() != NULL | |
10346 | || type->function_type() != NULL) | |
10347 | { | |
2c809f8f | 10348 | arg = Expression::make_cast(type, arg, location); |
88b03a70 | 10349 | code = Runtime::PRINTPOINTER; |
e440a328 | 10350 | } |
10351 | else if (type->interface_type() != NULL) | |
10352 | { | |
10353 | if (type->interface_type()->is_empty()) | |
88b03a70 | 10354 | code = Runtime::PRINTEFACE; |
e440a328 | 10355 | else |
88b03a70 | 10356 | code = Runtime::PRINTIFACE; |
e440a328 | 10357 | } |
411eb89e | 10358 | else if (type->is_slice_type()) |
88b03a70 | 10359 | code = Runtime::PRINTSLICE; |
e440a328 | 10360 | else |
cd238b8d | 10361 | { |
10362 | go_assert(saw_errors()); | |
ea664253 | 10363 | return context->backend()->error_expression(); |
cd238b8d | 10364 | } |
e440a328 | 10365 | |
2c809f8f | 10366 | Expression* call = Runtime::make_call(code, location, 1, arg); |
88b03a70 | 10367 | print_stmts = Expression::make_compound(print_stmts, call, |
10368 | location); | |
e440a328 | 10369 | } |
10370 | } | |
10371 | ||
10372 | if (is_ln) | |
10373 | { | |
2c809f8f | 10374 | Expression* print_nl = |
88b03a70 | 10375 | Runtime::make_call(Runtime::PRINTNL, location, 0); |
10376 | print_stmts = Expression::make_compound(print_stmts, print_nl, | |
10377 | location); | |
e440a328 | 10378 | } |
10379 | ||
88b03a70 | 10380 | Expression* unlock = Runtime::make_call(Runtime::PRINTUNLOCK, |
10381 | location, 0); | |
10382 | print_stmts = Expression::make_compound(print_stmts, unlock, location); | |
32e3ff69 | 10383 | |
ea664253 | 10384 | return print_stmts->get_backend(context); |
e440a328 | 10385 | } |
10386 | ||
10387 | case BUILTIN_PANIC: | |
10388 | { | |
10389 | const Expression_list* args = this->args(); | |
c484d925 | 10390 | go_assert(args != NULL && args->size() == 1); |
e440a328 | 10391 | Expression* arg = args->front(); |
b13c66cd | 10392 | Type *empty = |
823c7e3d | 10393 | Type::make_empty_interface_type(Linemap::predeclared_location()); |
2c809f8f | 10394 | arg = Expression::convert_for_assignment(gogo, empty, arg, location); |
10395 | ||
10396 | Expression* panic = | |
03ac9de4 | 10397 | Runtime::make_call(Runtime::GOPANIC, location, 1, arg); |
ea664253 | 10398 | return panic->get_backend(context); |
e440a328 | 10399 | } |
10400 | ||
10401 | case BUILTIN_RECOVER: | |
10402 | { | |
10403 | // The argument is set when building recover thunks. It's a | |
10404 | // boolean value which is true if we can recover a value now. | |
10405 | const Expression_list* args = this->args(); | |
c484d925 | 10406 | go_assert(args != NULL && args->size() == 1); |
e440a328 | 10407 | Expression* arg = args->front(); |
b13c66cd | 10408 | Type *empty = |
823c7e3d | 10409 | Type::make_empty_interface_type(Linemap::predeclared_location()); |
e440a328 | 10410 | |
e440a328 | 10411 | Expression* nil = Expression::make_nil(location); |
e007b1eb | 10412 | nil = Expression::make_interface_value(empty, nil, nil, location); |
e440a328 | 10413 | |
10414 | // We need to handle a deferred call to recover specially, | |
10415 | // because it changes whether it can recover a panic or not. | |
10416 | // See test7 in test/recover1.go. | |
2c809f8f | 10417 | Expression* recover = Runtime::make_call((this->is_deferred() |
03ac9de4 | 10418 | ? Runtime::DEFERREDRECOVER |
10419 | : Runtime::GORECOVER), | |
2c809f8f | 10420 | location, 0); |
10421 | Expression* cond = | |
10422 | Expression::make_conditional(arg, recover, nil, location); | |
ea664253 | 10423 | return cond->get_backend(context); |
e440a328 | 10424 | } |
10425 | ||
10426 | case BUILTIN_CLOSE: | |
e440a328 | 10427 | { |
10428 | const Expression_list* args = this->args(); | |
c484d925 | 10429 | go_assert(args != NULL && args->size() == 1); |
e440a328 | 10430 | Expression* arg = args->front(); |
2c809f8f | 10431 | Expression* close = Runtime::make_call(Runtime::CLOSE, location, |
10432 | 1, arg); | |
ea664253 | 10433 | return close->get_backend(context); |
e440a328 | 10434 | } |
10435 | ||
10436 | case BUILTIN_SIZEOF: | |
10437 | case BUILTIN_OFFSETOF: | |
10438 | case BUILTIN_ALIGNOF: | |
10439 | { | |
0c77715b | 10440 | Numeric_constant nc; |
10441 | unsigned long val; | |
10442 | if (!this->numeric_constant_value(&nc) | |
10443 | || nc.to_unsigned_long(&val) != Numeric_constant::NC_UL_VALID) | |
7f1d9abd | 10444 | { |
c484d925 | 10445 | go_assert(saw_errors()); |
ea664253 | 10446 | return context->backend()->error_expression(); |
7f1d9abd | 10447 | } |
7ba86326 | 10448 | Type* uintptr_type = Type::lookup_integer_type("uintptr"); |
2c809f8f | 10449 | mpz_t ival; |
10450 | nc.get_int(&ival); | |
10451 | Expression* int_cst = | |
e67508fa | 10452 | Expression::make_integer_z(&ival, uintptr_type, location); |
2c809f8f | 10453 | mpz_clear(ival); |
ea664253 | 10454 | return int_cst->get_backend(context); |
e440a328 | 10455 | } |
10456 | ||
10457 | case BUILTIN_COPY: | |
7fdb0876 | 10458 | // Handled in Builtin_call_expression::do_flatten. |
10459 | go_unreachable(); | |
e440a328 | 10460 | |
10461 | case BUILTIN_APPEND: | |
321e5ad2 | 10462 | // Handled in Builtin_call_expression::flatten_append. |
10463 | go_unreachable(); | |
e440a328 | 10464 | |
10465 | case BUILTIN_REAL: | |
10466 | case BUILTIN_IMAG: | |
10467 | { | |
10468 | const Expression_list* args = this->args(); | |
c484d925 | 10469 | go_assert(args != NULL && args->size() == 1); |
2c809f8f | 10470 | |
10471 | Bexpression* ret; | |
ea664253 | 10472 | Bexpression* bcomplex = args->front()->get_backend(context); |
2c809f8f | 10473 | if (this->code_ == BUILTIN_REAL) |
10474 | ret = gogo->backend()->real_part_expression(bcomplex, location); | |
10475 | else | |
10476 | ret = gogo->backend()->imag_part_expression(bcomplex, location); | |
ea664253 | 10477 | return ret; |
e440a328 | 10478 | } |
10479 | ||
48080209 | 10480 | case BUILTIN_COMPLEX: |
e440a328 | 10481 | { |
10482 | const Expression_list* args = this->args(); | |
c484d925 | 10483 | go_assert(args != NULL && args->size() == 2); |
ea664253 | 10484 | Bexpression* breal = args->front()->get_backend(context); |
10485 | Bexpression* bimag = args->back()->get_backend(context); | |
10486 | return gogo->backend()->complex_expression(breal, bimag, location); | |
e440a328 | 10487 | } |
10488 | ||
10489 | default: | |
c3e6f413 | 10490 | go_unreachable(); |
e440a328 | 10491 | } |
10492 | } | |
10493 | ||
10494 | // We have to support exporting a builtin call expression, because | |
10495 | // code can set a constant to the result of a builtin expression. | |
10496 | ||
10497 | void | |
548be246 | 10498 | Builtin_call_expression::do_export(Export_function_body* efb) const |
e440a328 | 10499 | { |
0c77715b | 10500 | Numeric_constant nc; |
e3d09834 | 10501 | if (this->numeric_constant_value(&nc)) |
0c77715b | 10502 | { |
e3d09834 | 10503 | if (nc.is_int()) |
10504 | { | |
10505 | mpz_t val; | |
10506 | nc.get_int(&val); | |
10507 | Integer_expression::export_integer(efb, val); | |
10508 | mpz_clear(val); | |
10509 | } | |
10510 | else if (nc.is_float()) | |
10511 | { | |
10512 | mpfr_t fval; | |
10513 | nc.get_float(&fval); | |
10514 | Float_expression::export_float(efb, fval); | |
10515 | mpfr_clear(fval); | |
10516 | } | |
10517 | else if (nc.is_complex()) | |
10518 | { | |
10519 | mpc_t cval; | |
10520 | nc.get_complex(&cval); | |
10521 | Complex_expression::export_complex(efb, cval); | |
10522 | mpc_clear(cval); | |
10523 | } | |
10524 | else | |
10525 | go_unreachable(); | |
e440a328 | 10526 | |
e3d09834 | 10527 | // A trailing space lets us reliably identify the end of the number. |
10528 | efb->write_c_string(" "); | |
e440a328 | 10529 | } |
e3d09834 | 10530 | else |
e440a328 | 10531 | { |
e3d09834 | 10532 | const char *s = NULL; |
10533 | switch (this->code_) | |
10534 | { | |
10535 | default: | |
10536 | go_unreachable(); | |
10537 | case BUILTIN_APPEND: | |
10538 | s = "append"; | |
10539 | break; | |
10540 | case BUILTIN_COPY: | |
10541 | s = "copy"; | |
10542 | break; | |
10543 | case BUILTIN_LEN: | |
10544 | s = "len"; | |
10545 | break; | |
10546 | case BUILTIN_CAP: | |
10547 | s = "cap"; | |
10548 | break; | |
26329c24 | 10549 | case BUILTIN_DELETE: |
10550 | s = "delete"; | |
10551 | break; | |
e3d09834 | 10552 | case BUILTIN_PRINT: |
10553 | s = "print"; | |
10554 | break; | |
10555 | case BUILTIN_PRINTLN: | |
10556 | s = "println"; | |
10557 | break; | |
10558 | case BUILTIN_PANIC: | |
10559 | s = "panic"; | |
10560 | break; | |
10561 | case BUILTIN_RECOVER: | |
10562 | s = "recover"; | |
10563 | break; | |
10564 | case BUILTIN_CLOSE: | |
10565 | s = "close"; | |
10566 | break; | |
10567 | case BUILTIN_REAL: | |
10568 | s = "real"; | |
10569 | break; | |
10570 | case BUILTIN_IMAG: | |
10571 | s = "imag"; | |
10572 | break; | |
10573 | case BUILTIN_COMPLEX: | |
10574 | s = "complex"; | |
10575 | break; | |
10576 | } | |
10577 | efb->write_c_string(s); | |
10578 | this->export_arguments(efb); | |
e440a328 | 10579 | } |
e440a328 | 10580 | } |
10581 | ||
10582 | // Class Call_expression. | |
10583 | ||
8381eda7 | 10584 | // A Go function can be viewed in a couple of different ways. The |
10585 | // code of a Go function becomes a backend function with parameters | |
10586 | // whose types are simply the backend representation of the Go types. | |
10587 | // If there are multiple results, they are returned as a backend | |
10588 | // struct. | |
10589 | ||
10590 | // However, when Go code refers to a function other than simply | |
10591 | // calling it, the backend type of that function is actually a struct. | |
10592 | // The first field of the struct points to the Go function code | |
10593 | // (sometimes a wrapper as described below). The remaining fields | |
10594 | // hold addresses of closed-over variables. This struct is called a | |
10595 | // closure. | |
10596 | ||
10597 | // There are a few cases to consider. | |
10598 | ||
10599 | // A direct function call of a known function in package scope. In | |
10600 | // this case there are no closed-over variables, and we know the name | |
10601 | // of the function code. We can simply produce a backend call to the | |
10602 | // function directly, and not worry about the closure. | |
10603 | ||
10604 | // A direct function call of a known function literal. In this case | |
10605 | // we know the function code and we know the closure. We generate the | |
10606 | // function code such that it expects an additional final argument of | |
10607 | // the closure type. We pass the closure as the last argument, after | |
10608 | // the other arguments. | |
10609 | ||
10610 | // An indirect function call. In this case we have a closure. We | |
10611 | // load the pointer to the function code from the first field of the | |
10612 | // closure. We pass the address of the closure as the last argument. | |
10613 | ||
10614 | // A call to a method of an interface. Type methods are always at | |
10615 | // package scope, so we call the function directly, and don't worry | |
10616 | // about the closure. | |
10617 | ||
10618 | // This means that for a function at package scope we have two cases. | |
10619 | // One is the direct call, which has no closure. The other is the | |
10620 | // indirect call, which does have a closure. We can't simply ignore | |
10621 | // the closure, even though it is the last argument, because that will | |
10622 | // fail on targets where the function pops its arguments. So when | |
10623 | // generating a closure for a package-scope function we set the | |
10624 | // function code pointer in the closure to point to a wrapper | |
10625 | // function. This wrapper function accepts a final argument that | |
10626 | // points to the closure, ignores it, and calls the real function as a | |
10627 | // direct function call. This wrapper will normally be efficient, and | |
10628 | // can often simply be a tail call to the real function. | |
10629 | ||
10630 | // We don't use GCC's static chain pointer because 1) we don't need | |
10631 | // it; 2) GCC only permits using a static chain to call a known | |
10632 | // function, so we can't use it for an indirect call anyhow. Since we | |
10633 | // can't use it for an indirect call, we may as well not worry about | |
10634 | // using it for a direct call either. | |
10635 | ||
10636 | // We pass the closure last rather than first because it means that | |
10637 | // the function wrapper we put into a closure for a package-scope | |
10638 | // function can normally just be a tail call to the real function. | |
10639 | ||
10640 | // For method expressions we generate a wrapper that loads the | |
10641 | // receiver from the closure and then calls the method. This | |
10642 | // unfortunately forces reshuffling the arguments, since there is a | |
10643 | // new first argument, but we can't avoid reshuffling either for | |
10644 | // method expressions or for indirect calls of package-scope | |
10645 | // functions, and since the latter are more common we reshuffle for | |
10646 | // method expressions. | |
10647 | ||
10648 | // Note that the Go code retains the Go types. The extra final | |
10649 | // argument only appears when we convert to the backend | |
10650 | // representation. | |
10651 | ||
e440a328 | 10652 | // Traversal. |
10653 | ||
10654 | int | |
10655 | Call_expression::do_traverse(Traverse* traverse) | |
10656 | { | |
0c0dacab | 10657 | // If we are calling a function in a different package that returns |
10658 | // an unnamed type, this may be the only chance we get to traverse | |
10659 | // that type. We don't traverse this->type_ because it may be a | |
10660 | // Call_multiple_result_type that will just lead back here. | |
10661 | if (this->type_ != NULL && !this->type_->is_error_type()) | |
10662 | { | |
10663 | Function_type *fntype = this->get_function_type(); | |
10664 | if (fntype != NULL && Type::traverse(fntype, traverse) == TRAVERSE_EXIT) | |
10665 | return TRAVERSE_EXIT; | |
10666 | } | |
e440a328 | 10667 | if (Expression::traverse(&this->fn_, traverse) == TRAVERSE_EXIT) |
10668 | return TRAVERSE_EXIT; | |
10669 | if (this->args_ != NULL) | |
10670 | { | |
10671 | if (this->args_->traverse(traverse) == TRAVERSE_EXIT) | |
10672 | return TRAVERSE_EXIT; | |
10673 | } | |
10674 | return TRAVERSE_CONTINUE; | |
10675 | } | |
10676 | ||
10677 | // Lower a call statement. | |
10678 | ||
10679 | Expression* | |
ceeb4318 | 10680 | Call_expression::do_lower(Gogo* gogo, Named_object* function, |
10681 | Statement_inserter* inserter, int) | |
e440a328 | 10682 | { |
b13c66cd | 10683 | Location loc = this->location(); |
09ea332d | 10684 | |
ceeb4318 | 10685 | // A type cast can look like a function call. |
e440a328 | 10686 | if (this->fn_->is_type_expression() |
10687 | && this->args_ != NULL | |
10688 | && this->args_->size() == 1) | |
10689 | return Expression::make_cast(this->fn_->type(), this->args_->front(), | |
09ea332d | 10690 | loc); |
e440a328 | 10691 | |
88f06749 | 10692 | // Because do_type will return an error type and thus prevent future |
10693 | // errors, check for that case now to ensure that the error gets | |
10694 | // reported. | |
37448b10 | 10695 | Function_type* fntype = this->get_function_type(); |
10696 | if (fntype == NULL) | |
88f06749 | 10697 | { |
10698 | if (!this->fn_->type()->is_error()) | |
10699 | this->report_error(_("expected function")); | |
5f1045b5 | 10700 | this->set_is_error(); |
10701 | return this; | |
88f06749 | 10702 | } |
10703 | ||
e440a328 | 10704 | // Handle an argument which is a call to a function which returns |
10705 | // multiple results. | |
10706 | if (this->args_ != NULL | |
10707 | && this->args_->size() == 1 | |
37448b10 | 10708 | && this->args_->front()->call_expression() != NULL) |
e440a328 | 10709 | { |
e440a328 | 10710 | size_t rc = this->args_->front()->call_expression()->result_count(); |
10711 | if (rc > 1 | |
37448b10 | 10712 | && ((fntype->parameters() != NULL |
10713 | && (fntype->parameters()->size() == rc | |
10714 | || (fntype->is_varargs() | |
10715 | && fntype->parameters()->size() - 1 <= rc))) | |
10716 | || fntype->is_builtin())) | |
e440a328 | 10717 | { |
10718 | Call_expression* call = this->args_->front()->call_expression(); | |
e90ecd2d | 10719 | call->set_is_multi_value_arg(); |
c33af8e4 | 10720 | if (this->is_varargs_) |
10721 | { | |
10722 | // It is not clear which result of a multiple result call | |
10723 | // the ellipsis operator should be applied to. If we unpack the | |
10724 | // the call into its individual results here, the ellipsis will be | |
10725 | // applied to the last result. | |
631d5788 | 10726 | go_error_at(call->location(), |
10727 | _("multiple-value argument in single-value context")); | |
c33af8e4 | 10728 | return Expression::make_error(call->location()); |
10729 | } | |
10730 | ||
e440a328 | 10731 | Expression_list* args = new Expression_list; |
10732 | for (size_t i = 0; i < rc; ++i) | |
10733 | args->push_back(Expression::make_call_result(call, i)); | |
10734 | // We can't return a new call expression here, because this | |
42535814 | 10735 | // one may be referenced by Call_result expressions. We |
10736 | // also can't delete the old arguments, because we may still | |
10737 | // traverse them somewhere up the call stack. FIXME. | |
e440a328 | 10738 | this->args_ = args; |
10739 | } | |
10740 | } | |
10741 | ||
37448b10 | 10742 | // Recognize a call to a builtin function. |
10743 | if (fntype->is_builtin()) | |
28819633 | 10744 | { |
10745 | Builtin_call_expression* bce = | |
10746 | new Builtin_call_expression(gogo, this->fn_, this->args_, | |
10747 | this->is_varargs_, loc); | |
10748 | if (this->is_deferred_) | |
10749 | bce->set_is_deferred(); | |
10750 | if (this->is_concurrent_) | |
10751 | bce->set_is_concurrent(); | |
10752 | return bce; | |
10753 | } | |
37448b10 | 10754 | |
ceeb4318 | 10755 | // If this call returns multiple results, create a temporary |
5731103c | 10756 | // variable to hold them. |
10757 | if (this->result_count() > 1 && this->call_temp_ == NULL) | |
ceeb4318 | 10758 | { |
5731103c | 10759 | Struct_field_list* sfl = new Struct_field_list(); |
10760 | Function_type* fntype = this->get_function_type(); | |
37448b10 | 10761 | const Typed_identifier_list* results = fntype->results(); |
5731103c | 10762 | Location loc = this->location(); |
10763 | ||
10764 | int i = 0; | |
10765 | char buf[20]; | |
ceeb4318 | 10766 | for (Typed_identifier_list::const_iterator p = results->begin(); |
5731103c | 10767 | p != results->end(); |
10768 | ++p, ++i) | |
10769 | { | |
10770 | snprintf(buf, sizeof buf, "res%d", i); | |
10771 | sfl->push_back(Struct_field(Typed_identifier(buf, p->type(), loc))); | |
10772 | } | |
10773 | ||
10774 | Struct_type* st = Type::make_struct_type(sfl, loc); | |
10775 | st->set_is_struct_incomparable(); | |
10776 | this->call_temp_ = Statement::make_temporary(st, NULL, loc); | |
10777 | inserter->insert(this->call_temp_); | |
ceeb4318 | 10778 | } |
10779 | ||
e440a328 | 10780 | // Handle a call to a varargs function by packaging up the extra |
10781 | // parameters. | |
37448b10 | 10782 | if (fntype->is_varargs()) |
e440a328 | 10783 | { |
e440a328 | 10784 | const Typed_identifier_list* parameters = fntype->parameters(); |
c484d925 | 10785 | go_assert(parameters != NULL && !parameters->empty()); |
e440a328 | 10786 | Type* varargs_type = parameters->back().type(); |
09ea332d | 10787 | this->lower_varargs(gogo, function, inserter, varargs_type, |
0e9a2e72 | 10788 | parameters->size(), SLICE_STORAGE_MAY_ESCAPE); |
09ea332d | 10789 | } |
10790 | ||
10791 | // If this is call to a method, call the method directly passing the | |
10792 | // object as the first parameter. | |
10793 | Bound_method_expression* bme = this->fn_->bound_method_expression(); | |
10794 | if (bme != NULL) | |
10795 | { | |
0afbb937 | 10796 | Named_object* methodfn = bme->function(); |
5b665222 | 10797 | Function_type* mft = (methodfn->is_function() |
10798 | ? methodfn->func_value()->type() | |
10799 | : methodfn->func_declaration_value()->type()); | |
09ea332d | 10800 | Expression* first_arg = bme->first_argument(); |
10801 | ||
5b665222 | 10802 | // We always pass a pointer when calling a method, except for |
10803 | // direct interface types when calling a value method. | |
10804 | if (!first_arg->type()->is_error() | |
10805 | && !first_arg->type()->is_direct_iface_type()) | |
09ea332d | 10806 | { |
10807 | first_arg = Expression::make_unary(OPERATOR_AND, first_arg, loc); | |
10808 | // We may need to create a temporary variable so that we can | |
10809 | // take the address. We can't do that here because it will | |
10810 | // mess up the order of evaluation. | |
10811 | Unary_expression* ue = static_cast<Unary_expression*>(first_arg); | |
10812 | ue->set_create_temp(); | |
10813 | } | |
5b665222 | 10814 | else if (mft->receiver()->type()->points_to() == NULL |
10815 | && first_arg->type()->points_to() != NULL | |
10816 | && first_arg->type()->points_to()->is_direct_iface_type()) | |
10817 | first_arg = Expression::make_dereference(first_arg, | |
10818 | Expression::NIL_CHECK_DEFAULT, | |
10819 | loc); | |
09ea332d | 10820 | |
10821 | // If we are calling a method which was inherited from an | |
10822 | // embedded struct, and the method did not get a stub, then the | |
10823 | // first type may be wrong. | |
10824 | Type* fatype = bme->first_argument_type(); | |
10825 | if (fatype != NULL) | |
10826 | { | |
10827 | if (fatype->points_to() == NULL) | |
10828 | fatype = Type::make_pointer_type(fatype); | |
10829 | first_arg = Expression::make_unsafe_cast(fatype, first_arg, loc); | |
10830 | } | |
10831 | ||
10832 | Expression_list* new_args = new Expression_list(); | |
10833 | new_args->push_back(first_arg); | |
10834 | if (this->args_ != NULL) | |
10835 | { | |
10836 | for (Expression_list::const_iterator p = this->args_->begin(); | |
10837 | p != this->args_->end(); | |
10838 | ++p) | |
10839 | new_args->push_back(*p); | |
10840 | } | |
10841 | ||
10842 | // We have to change in place because this structure may be | |
10843 | // referenced by Call_result_expressions. We can't delete the | |
10844 | // old arguments, because we may be traversing them up in some | |
10845 | // caller. FIXME. | |
10846 | this->args_ = new_args; | |
0afbb937 | 10847 | this->fn_ = Expression::make_func_reference(methodfn, NULL, |
09ea332d | 10848 | bme->location()); |
e440a328 | 10849 | } |
10850 | ||
81affb1d | 10851 | // If this is a call to an imported function for which we have an |
10852 | // inlinable function body, add it to the list of functions to give | |
10853 | // to the backend as inlining opportunities. | |
10854 | Func_expression* fe = this->fn_->func_expression(); | |
10855 | if (fe != NULL | |
10856 | && fe->named_object()->is_function_declaration() | |
10857 | && fe->named_object()->func_declaration_value()->has_imported_body()) | |
10858 | gogo->add_imported_inlinable_function(fe->named_object()); | |
10859 | ||
e440a328 | 10860 | return this; |
10861 | } | |
10862 | ||
10863 | // Lower a call to a varargs function. FUNCTION is the function in | |
10864 | // which the call occurs--it's not the function we are calling. | |
10865 | // VARARGS_TYPE is the type of the varargs parameter, a slice type. | |
10866 | // PARAM_COUNT is the number of parameters of the function we are | |
10867 | // calling; the last of these parameters will be the varargs | |
10868 | // parameter. | |
10869 | ||
09ea332d | 10870 | void |
e440a328 | 10871 | Call_expression::lower_varargs(Gogo* gogo, Named_object* function, |
ceeb4318 | 10872 | Statement_inserter* inserter, |
0e9a2e72 | 10873 | Type* varargs_type, size_t param_count, |
10874 | Slice_storage_escape_disp escape_disp) | |
e440a328 | 10875 | { |
10876 | if (this->varargs_are_lowered_) | |
09ea332d | 10877 | return; |
e440a328 | 10878 | |
b13c66cd | 10879 | Location loc = this->location(); |
e440a328 | 10880 | |
c484d925 | 10881 | go_assert(param_count > 0); |
411eb89e | 10882 | go_assert(varargs_type->is_slice_type()); |
e440a328 | 10883 | |
10884 | size_t arg_count = this->args_ == NULL ? 0 : this->args_->size(); | |
10885 | if (arg_count < param_count - 1) | |
10886 | { | |
10887 | // Not enough arguments; will be caught in check_types. | |
09ea332d | 10888 | return; |
e440a328 | 10889 | } |
10890 | ||
10891 | Expression_list* old_args = this->args_; | |
10892 | Expression_list* new_args = new Expression_list(); | |
10893 | bool push_empty_arg = false; | |
10894 | if (old_args == NULL || old_args->empty()) | |
10895 | { | |
c484d925 | 10896 | go_assert(param_count == 1); |
e440a328 | 10897 | push_empty_arg = true; |
10898 | } | |
10899 | else | |
10900 | { | |
10901 | Expression_list::const_iterator pa; | |
10902 | int i = 1; | |
10903 | for (pa = old_args->begin(); pa != old_args->end(); ++pa, ++i) | |
10904 | { | |
10905 | if (static_cast<size_t>(i) == param_count) | |
10906 | break; | |
10907 | new_args->push_back(*pa); | |
10908 | } | |
10909 | ||
10910 | // We have reached the varargs parameter. | |
10911 | ||
10912 | bool issued_error = false; | |
10913 | if (pa == old_args->end()) | |
10914 | push_empty_arg = true; | |
10915 | else if (pa + 1 == old_args->end() && this->is_varargs_) | |
10916 | new_args->push_back(*pa); | |
10917 | else if (this->is_varargs_) | |
10918 | { | |
a6645f74 | 10919 | if ((*pa)->type()->is_slice_type()) |
10920 | this->report_error(_("too many arguments")); | |
10921 | else | |
10922 | { | |
631d5788 | 10923 | go_error_at(this->location(), |
10924 | _("invalid use of %<...%> with non-slice")); | |
a6645f74 | 10925 | this->set_is_error(); |
10926 | } | |
09ea332d | 10927 | return; |
e440a328 | 10928 | } |
e440a328 | 10929 | else |
10930 | { | |
10931 | Type* element_type = varargs_type->array_type()->element_type(); | |
10932 | Expression_list* vals = new Expression_list; | |
10933 | for (; pa != old_args->end(); ++pa, ++i) | |
10934 | { | |
10935 | // Check types here so that we get a better message. | |
10936 | Type* patype = (*pa)->type(); | |
b13c66cd | 10937 | Location paloc = (*pa)->location(); |
e440a328 | 10938 | if (!this->check_argument_type(i, element_type, patype, |
10939 | paloc, issued_error)) | |
10940 | continue; | |
10941 | vals->push_back(*pa); | |
10942 | } | |
0e9a2e72 | 10943 | Slice_construction_expression* sce = |
e440a328 | 10944 | Expression::make_slice_composite_literal(varargs_type, vals, loc); |
0e9a2e72 | 10945 | if (escape_disp == SLICE_STORAGE_DOES_NOT_ESCAPE) |
10946 | sce->set_storage_does_not_escape(); | |
10947 | Expression* val = sce; | |
09ea332d | 10948 | gogo->lower_expression(function, inserter, &val); |
e440a328 | 10949 | new_args->push_back(val); |
10950 | } | |
10951 | } | |
10952 | ||
10953 | if (push_empty_arg) | |
10954 | new_args->push_back(Expression::make_nil(loc)); | |
10955 | ||
10956 | // We can't return a new call expression here, because this one may | |
6d4c2432 | 10957 | // be referenced by Call_result expressions. FIXME. We can't |
10958 | // delete OLD_ARGS because we may have both a Call_expression and a | |
10959 | // Builtin_call_expression which refer to them. FIXME. | |
e440a328 | 10960 | this->args_ = new_args; |
10961 | this->varargs_are_lowered_ = true; | |
e440a328 | 10962 | } |
10963 | ||
2c809f8f | 10964 | // Flatten a call with multiple results into a temporary. |
10965 | ||
10966 | Expression* | |
b8e86a51 | 10967 | Call_expression::do_flatten(Gogo* gogo, Named_object*, |
10968 | Statement_inserter* inserter) | |
2c809f8f | 10969 | { |
5bf8be8b | 10970 | if (this->is_erroneous_call()) |
10971 | { | |
10972 | go_assert(saw_errors()); | |
10973 | return Expression::make_error(this->location()); | |
10974 | } | |
b8e86a51 | 10975 | |
91c0fd76 | 10976 | if (this->is_flattened_) |
10977 | return this; | |
10978 | this->is_flattened_ = true; | |
10979 | ||
b8e86a51 | 10980 | // Add temporary variables for all arguments that require type |
10981 | // conversion. | |
10982 | Function_type* fntype = this->get_function_type(); | |
9782d556 | 10983 | if (fntype == NULL) |
10984 | { | |
10985 | go_assert(saw_errors()); | |
10986 | return this; | |
10987 | } | |
b8e86a51 | 10988 | if (this->args_ != NULL && !this->args_->empty() |
10989 | && fntype->parameters() != NULL && !fntype->parameters()->empty()) | |
10990 | { | |
10991 | bool is_interface_method = | |
10992 | this->fn_->interface_field_reference_expression() != NULL; | |
10993 | ||
10994 | Expression_list *args = new Expression_list(); | |
10995 | Typed_identifier_list::const_iterator pp = fntype->parameters()->begin(); | |
10996 | Expression_list::const_iterator pa = this->args_->begin(); | |
10997 | if (!is_interface_method && fntype->is_method()) | |
10998 | { | |
10999 | // The receiver argument. | |
11000 | args->push_back(*pa); | |
11001 | ++pa; | |
11002 | } | |
11003 | for (; pa != this->args_->end(); ++pa, ++pp) | |
11004 | { | |
11005 | go_assert(pp != fntype->parameters()->end()); | |
3a522dcc | 11006 | if (Type::are_identical(pp->type(), (*pa)->type(), |
11007 | Type::COMPARE_TAGS, NULL)) | |
b8e86a51 | 11008 | args->push_back(*pa); |
11009 | else | |
11010 | { | |
11011 | Location loc = (*pa)->location(); | |
8ba8cc87 | 11012 | Expression* arg = *pa; |
11013 | if (!arg->is_variable()) | |
11014 | { | |
11015 | Temporary_statement *temp = | |
11016 | Statement::make_temporary(NULL, arg, loc); | |
11017 | inserter->insert(temp); | |
11018 | arg = Expression::make_temporary_reference(temp, loc); | |
11019 | } | |
11020 | arg = Expression::convert_for_assignment(gogo, pp->type(), arg, | |
11021 | loc); | |
11022 | args->push_back(arg); | |
b8e86a51 | 11023 | } |
11024 | } | |
11025 | delete this->args_; | |
11026 | this->args_ = args; | |
11027 | } | |
11028 | ||
6c8a521f | 11029 | // Lower to compiler intrinsic if possible. |
11030 | Func_expression* fe = this->fn_->func_expression(); | |
2f0168ee | 11031 | if (!this->is_concurrent_ && !this->is_deferred_ |
11032 | && fe != NULL | |
6c8a521f | 11033 | && (fe->named_object()->is_function_declaration() |
11034 | || fe->named_object()->is_function())) | |
11035 | { | |
11036 | Expression* ret = this->intrinsify(gogo, inserter); | |
11037 | if (ret != NULL) | |
11038 | return ret; | |
11039 | } | |
11040 | ||
2c809f8f | 11041 | return this; |
11042 | } | |
11043 | ||
6c8a521f | 11044 | // Lower a call to a compiler intrinsic if possible. |
11045 | // Returns NULL if it is not an intrinsic. | |
11046 | ||
11047 | Expression* | |
11048 | Call_expression::intrinsify(Gogo* gogo, | |
11049 | Statement_inserter* inserter) | |
11050 | { | |
11051 | Func_expression* fe = this->fn_->func_expression(); | |
11052 | Named_object* no = fe->named_object(); | |
11053 | std::string name = Gogo::unpack_hidden_name(no->name()); | |
11054 | std::string package = (no->package() != NULL | |
11055 | ? no->package()->pkgpath() | |
11056 | : gogo->pkgpath()); | |
11057 | Location loc = this->location(); | |
11058 | ||
11059 | Type* int_type = Type::lookup_integer_type("int"); | |
daccb2bc | 11060 | Type* int32_type = Type::lookup_integer_type("int32"); |
11061 | Type* int64_type = Type::lookup_integer_type("int64"); | |
11062 | Type* uint_type = Type::lookup_integer_type("uint"); | |
6c8a521f | 11063 | Type* uint32_type = Type::lookup_integer_type("uint32"); |
11064 | Type* uint64_type = Type::lookup_integer_type("uint64"); | |
11065 | Type* uintptr_type = Type::lookup_integer_type("uintptr"); | |
daccb2bc | 11066 | Type* pointer_type = Type::make_pointer_type(Type::make_void_type()); |
11067 | ||
11068 | int int_size = int_type->named_type()->real_type()->integer_type()->bits() / 8; | |
11069 | int ptr_size = uintptr_type->named_type()->real_type()->integer_type()->bits() / 8; | |
6c8a521f | 11070 | |
2f0168ee | 11071 | if (package == "sync/atomic") |
11072 | { | |
11073 | // sync/atomic functions and runtime/internal/atomic functions | |
11074 | // are very similar. In order not to duplicate code, we just | |
11075 | // redirect to the latter and let the code below to handle them. | |
11076 | // In case there is no equivalent functions (slight variance | |
11077 | // in types), we just make an artificial name (begin with '$'). | |
11078 | // Note: no StorePointer, SwapPointer, and CompareAndSwapPointer, | |
11079 | // as they need write barriers. | |
11080 | if (name == "LoadInt32") | |
11081 | name = "$Loadint32"; | |
11082 | else if (name == "LoadInt64") | |
11083 | name = "Loadint64"; | |
11084 | else if (name == "LoadUint32") | |
11085 | name = "Load"; | |
11086 | else if (name == "LoadUint64") | |
11087 | name = "Load64"; | |
11088 | else if (name == "LoadUintptr") | |
11089 | name = "Loaduintptr"; | |
11090 | else if (name == "LoadPointer") | |
11091 | name = "Loadp"; | |
11092 | else if (name == "StoreInt32") | |
11093 | name = "$Storeint32"; | |
11094 | else if (name == "StoreInt64") | |
11095 | name = "$Storeint64"; | |
11096 | else if (name == "StoreUint32") | |
11097 | name = "Store"; | |
11098 | else if (name == "StoreUint64") | |
11099 | name = "Store64"; | |
11100 | else if (name == "StoreUintptr") | |
11101 | name = "Storeuintptr"; | |
11102 | else if (name == "AddInt32") | |
11103 | name = "$Xaddint32"; | |
11104 | else if (name == "AddInt64") | |
11105 | name = "Xaddint64"; | |
11106 | else if (name == "AddUint32") | |
11107 | name = "Xadd"; | |
11108 | else if (name == "AddUint64") | |
11109 | name = "Xadd64"; | |
11110 | else if (name == "AddUintptr") | |
11111 | name = "Xadduintptr"; | |
11112 | else if (name == "SwapInt32") | |
11113 | name = "$Xchgint32"; | |
11114 | else if (name == "SwapInt64") | |
11115 | name = "$Xchgint64"; | |
11116 | else if (name == "SwapUint32") | |
11117 | name = "Xchg"; | |
11118 | else if (name == "SwapUint64") | |
11119 | name = "Xchg64"; | |
11120 | else if (name == "SwapUintptr") | |
11121 | name = "Xchguintptr"; | |
11122 | else if (name == "CompareAndSwapInt32") | |
11123 | name = "$Casint32"; | |
11124 | else if (name == "CompareAndSwapInt64") | |
11125 | name = "$Casint64"; | |
11126 | else if (name == "CompareAndSwapUint32") | |
11127 | name = "Cas"; | |
11128 | else if (name == "CompareAndSwapUint64") | |
11129 | name = "Cas64"; | |
11130 | else if (name == "CompareAndSwapUintptr") | |
11131 | name = "Casuintptr"; | |
11132 | else | |
11133 | return NULL; | |
11134 | ||
11135 | package = "runtime/internal/atomic"; | |
11136 | } | |
11137 | ||
fdae40b7 | 11138 | if (package == "runtime/internal/sys") |
11139 | { | |
11140 | // runtime/internal/sys functions and math/bits functions | |
11141 | // are very similar. In order not to duplicate code, we just | |
11142 | // redirect to the latter and let the code below to handle them. | |
11143 | if (name == "Bswap32") | |
11144 | name = "ReverseBytes32"; | |
11145 | else if (name == "Bswap64") | |
11146 | name = "ReverseBytes64"; | |
11147 | else if (name == "Ctz32") | |
11148 | name = "TrailingZeros32"; | |
11149 | else if (name == "Ctz64") | |
11150 | name = "TrailingZeros64"; | |
11151 | else | |
11152 | return NULL; | |
11153 | ||
11154 | package = "math/bits"; | |
11155 | } | |
11156 | ||
6c8a521f | 11157 | if (package == "runtime") |
11158 | { | |
11159 | // Handle a couple of special runtime functions. In the runtime | |
11160 | // package, getcallerpc returns the PC of the caller, and | |
11161 | // getcallersp returns the frame pointer of the caller. Implement | |
11162 | // these by turning them into calls to GCC builtin functions. We | |
11163 | // could implement them in normal code, but then we would have to | |
11164 | // explicitly unwind the stack. These functions are intended to be | |
11165 | // efficient. Note that this technique obviously only works for | |
11166 | // direct calls, but that is the only way they are used. | |
11167 | if (name == "getcallerpc" | |
11168 | && (this->args_ == NULL || this->args_->size() == 0)) | |
11169 | { | |
11170 | Expression* arg = Expression::make_integer_ul(0, uint32_type, loc); | |
11171 | Expression* call = | |
11172 | Runtime::make_call(Runtime::BUILTIN_RETURN_ADDRESS, loc, | |
11173 | 1, arg); | |
11174 | // The builtin functions return void*, but the Go functions return uintptr. | |
11175 | return Expression::make_cast(uintptr_type, call, loc); | |
11176 | } | |
11177 | else if (name == "getcallersp" | |
11178 | && (this->args_ == NULL || this->args_->size() == 0)) | |
11179 | ||
11180 | { | |
11181 | Expression* call = | |
11182 | Runtime::make_call(Runtime::BUILTIN_DWARF_CFA, loc, 0); | |
11183 | // The builtin functions return void*, but the Go functions return uintptr. | |
11184 | return Expression::make_cast(uintptr_type, call, loc); | |
11185 | } | |
11186 | } | |
fdae40b7 | 11187 | else if (package == "math/bits") |
6c8a521f | 11188 | { |
fdae40b7 | 11189 | if ((name == "ReverseBytes16" || name == "ReverseBytes32" |
11190 | || name == "ReverseBytes64" || name == "ReverseBytes") | |
6c8a521f | 11191 | && this->args_ != NULL && this->args_->size() == 1) |
11192 | { | |
fdae40b7 | 11193 | Runtime::Function code; |
11194 | if (name == "ReverseBytes16") | |
11195 | code = Runtime::BUILTIN_BSWAP16; | |
11196 | else if (name == "ReverseBytes32") | |
11197 | code = Runtime::BUILTIN_BSWAP32; | |
11198 | else if (name == "ReverseBytes64") | |
11199 | code = Runtime::BUILTIN_BSWAP64; | |
11200 | else if (name == "ReverseBytes") | |
11201 | code = (int_size == 8 ? Runtime::BUILTIN_BSWAP64 : Runtime::BUILTIN_BSWAP32); | |
11202 | else | |
11203 | go_unreachable(); | |
6c8a521f | 11204 | Expression* arg = this->args_->front(); |
fdae40b7 | 11205 | Expression* call = Runtime::make_call(code, loc, 1, arg); |
11206 | if (name == "ReverseBytes") | |
11207 | return Expression::make_cast(uint_type, call, loc); | |
11208 | return call; | |
6c8a521f | 11209 | } |
fdae40b7 | 11210 | else if ((name == "TrailingZeros8" || name == "TrailingZeros16") |
6c8a521f | 11211 | && this->args_ != NULL && this->args_->size() == 1) |
11212 | { | |
fdae40b7 | 11213 | // GCC does not have a ctz8 or ctz16 intrinsic. We do |
11214 | // ctz32(0x100 | arg) or ctz32(0x10000 | arg). | |
6c8a521f | 11215 | Expression* arg = this->args_->front(); |
fdae40b7 | 11216 | arg = Expression::make_cast(uint32_type, arg, loc); |
11217 | unsigned long mask = (name == "TrailingZeros8" ? 0x100 : 0x10000); | |
11218 | Expression* c = Expression::make_integer_ul(mask, uint32_type, loc); | |
11219 | arg = Expression::make_binary(OPERATOR_OR, arg, c, loc); | |
11220 | Expression* call = Runtime::make_call(Runtime::BUILTIN_CTZ, loc, 1, arg); | |
11221 | return Expression::make_cast(int_type, call, loc); | |
6c8a521f | 11222 | } |
fdae40b7 | 11223 | else if ((name == "TrailingZeros32" |
11224 | || (name == "TrailingZeros" && int_size == 4)) | |
6c8a521f | 11225 | && this->args_ != NULL && this->args_->size() == 1) |
11226 | { | |
11227 | Expression* arg = this->args_->front(); | |
11228 | if (!arg->is_variable()) | |
11229 | { | |
11230 | Temporary_statement* ts = Statement::make_temporary(uint32_type, arg, loc); | |
11231 | inserter->insert(ts); | |
11232 | arg = Expression::make_temporary_reference(ts, loc); | |
11233 | } | |
11234 | // arg == 0 ? 32 : __builtin_ctz(arg) | |
11235 | Expression* zero = Expression::make_integer_ul(0, uint32_type, loc); | |
11236 | Expression* cmp = Expression::make_binary(OPERATOR_EQEQ, arg, zero, loc); | |
11237 | Expression* c32 = Expression::make_integer_ul(32, int_type, loc); | |
11238 | Expression* call = Runtime::make_call(Runtime::BUILTIN_CTZ, loc, 1, arg->copy()); | |
11239 | call = Expression::make_cast(int_type, call, loc); | |
11240 | return Expression::make_conditional(cmp, c32, call, loc); | |
11241 | } | |
fdae40b7 | 11242 | else if ((name == "TrailingZeros64" |
11243 | || (name == "TrailingZeros" && int_size == 8)) | |
6c8a521f | 11244 | && this->args_ != NULL && this->args_->size() == 1) |
11245 | { | |
11246 | Expression* arg = this->args_->front(); | |
11247 | if (!arg->is_variable()) | |
11248 | { | |
11249 | Temporary_statement* ts = Statement::make_temporary(uint64_type, arg, loc); | |
11250 | inserter->insert(ts); | |
11251 | arg = Expression::make_temporary_reference(ts, loc); | |
11252 | } | |
11253 | // arg == 0 ? 64 : __builtin_ctzll(arg) | |
11254 | Expression* zero = Expression::make_integer_ul(0, uint64_type, loc); | |
11255 | Expression* cmp = Expression::make_binary(OPERATOR_EQEQ, arg, zero, loc); | |
11256 | Expression* c64 = Expression::make_integer_ul(64, int_type, loc); | |
11257 | Expression* call = Runtime::make_call(Runtime::BUILTIN_CTZLL, loc, 1, arg->copy()); | |
11258 | call = Expression::make_cast(int_type, call, loc); | |
11259 | return Expression::make_conditional(cmp, c64, call, loc); | |
11260 | } | |
fdae40b7 | 11261 | else if ((name == "LeadingZeros8" || name == "LeadingZeros16" |
11262 | || name == "Len8" || name == "Len16") | |
11263 | && this->args_ != NULL && this->args_->size() == 1) | |
11264 | { | |
11265 | // GCC does not have a clz8 ir clz16 intrinsic. We do | |
11266 | // clz32(arg<<24 | 0xffffff) or clz32(arg<<16 | 0xffff). | |
11267 | Expression* arg = this->args_->front(); | |
11268 | arg = Expression::make_cast(uint32_type, arg, loc); | |
11269 | unsigned long shift = | |
11270 | ((name == "LeadingZeros8" || name == "Len8") ? 24 : 16); | |
11271 | Expression* c = Expression::make_integer_ul(shift, uint32_type, loc); | |
11272 | arg = Expression::make_binary(OPERATOR_LSHIFT, arg, c, loc); | |
11273 | unsigned long mask = | |
11274 | ((name == "LeadingZeros8" || name == "Len8") ? 0xffffff : 0xffff); | |
11275 | c = Expression::make_integer_ul(mask, uint32_type, loc); | |
11276 | arg = Expression::make_binary(OPERATOR_OR, arg, c, loc); | |
11277 | Expression* call = Runtime::make_call(Runtime::BUILTIN_CLZ, loc, 1, arg); | |
11278 | call = Expression::make_cast(int_type, call, loc); | |
11279 | // len = width - clz | |
11280 | if (name == "Len8") | |
11281 | { | |
11282 | c = Expression::make_integer_ul(8, int_type, loc); | |
11283 | return Expression::make_binary(OPERATOR_MINUS, c, call, loc); | |
11284 | } | |
11285 | else if (name == "Len16") | |
11286 | { | |
11287 | c = Expression::make_integer_ul(16, int_type, loc); | |
11288 | return Expression::make_binary(OPERATOR_MINUS, c, call, loc); | |
11289 | } | |
11290 | return call; | |
11291 | } | |
11292 | else if ((name == "LeadingZeros32" || name == "Len32" | |
11293 | || ((name == "LeadingZeros" || name == "Len") && int_size == 4)) | |
11294 | && this->args_ != NULL && this->args_->size() == 1) | |
11295 | { | |
11296 | Expression* arg = this->args_->front(); | |
11297 | if (!arg->is_variable()) | |
11298 | { | |
11299 | Temporary_statement* ts = Statement::make_temporary(uint32_type, arg, loc); | |
11300 | inserter->insert(ts); | |
11301 | arg = Expression::make_temporary_reference(ts, loc); | |
11302 | } | |
11303 | // arg == 0 ? 32 : __builtin_clz(arg) | |
11304 | Expression* zero = Expression::make_integer_ul(0, uint32_type, loc); | |
11305 | Expression* cmp = Expression::make_binary(OPERATOR_EQEQ, arg, zero, loc); | |
11306 | Expression* c32 = Expression::make_integer_ul(32, int_type, loc); | |
11307 | Expression* call = Runtime::make_call(Runtime::BUILTIN_CLZ, loc, 1, arg->copy()); | |
11308 | call = Expression::make_cast(int_type, call, loc); | |
11309 | Expression* cond = Expression::make_conditional(cmp, c32, call, loc); | |
11310 | // len = 32 - clz | |
11311 | if (name == "Len32" || name == "Len") | |
11312 | return Expression::make_binary(OPERATOR_MINUS, c32->copy(), cond, loc); | |
11313 | return cond; | |
11314 | } | |
11315 | else if ((name == "LeadingZeros64" || name == "Len64" | |
11316 | || ((name == "LeadingZeros" || name == "Len") && int_size == 8)) | |
11317 | && this->args_ != NULL && this->args_->size() == 1) | |
11318 | { | |
11319 | Expression* arg = this->args_->front(); | |
11320 | if (!arg->is_variable()) | |
11321 | { | |
11322 | Temporary_statement* ts = Statement::make_temporary(uint64_type, arg, loc); | |
11323 | inserter->insert(ts); | |
11324 | arg = Expression::make_temporary_reference(ts, loc); | |
11325 | } | |
11326 | // arg == 0 ? 64 : __builtin_clzll(arg) | |
11327 | Expression* zero = Expression::make_integer_ul(0, uint64_type, loc); | |
11328 | Expression* cmp = Expression::make_binary(OPERATOR_EQEQ, arg, zero, loc); | |
11329 | Expression* c64 = Expression::make_integer_ul(64, int_type, loc); | |
11330 | Expression* call = Runtime::make_call(Runtime::BUILTIN_CLZLL, loc, 1, arg->copy()); | |
11331 | call = Expression::make_cast(int_type, call, loc); | |
11332 | Expression* cond = Expression::make_conditional(cmp, c64, call, loc); | |
11333 | // len = 64 - clz | |
11334 | if (name == "Len64" || name == "Len") | |
11335 | return Expression::make_binary(OPERATOR_MINUS, c64->copy(), cond, loc); | |
11336 | return cond; | |
11337 | } | |
11338 | else if ((name == "OnesCount8" || name == "OnesCount16" | |
11339 | || name == "OnesCount32" || name == "OnesCount64" | |
11340 | || name == "OnesCount") | |
11341 | && this->args_ != NULL && this->args_->size() == 1) | |
11342 | { | |
11343 | Runtime::Function code; | |
11344 | if (name == "OnesCount64") | |
11345 | code = Runtime::BUILTIN_POPCOUNTLL; | |
11346 | else if (name == "OnesCount") | |
11347 | code = (int_size == 8 ? Runtime::BUILTIN_POPCOUNTLL : Runtime::BUILTIN_POPCOUNT); | |
11348 | else | |
11349 | code = Runtime::BUILTIN_POPCOUNT; | |
11350 | Expression* arg = this->args_->front(); | |
11351 | Expression* call = Runtime::make_call(code, loc, 1, arg); | |
11352 | return Expression::make_cast(int_type, call, loc); | |
11353 | } | |
6c8a521f | 11354 | } |
daccb2bc | 11355 | else if (package == "runtime/internal/atomic") |
11356 | { | |
11357 | int memorder = __ATOMIC_SEQ_CST; | |
11358 | ||
11359 | if ((name == "Load" || name == "Load64" || name == "Loadint64" || name == "Loadp" | |
2f0168ee | 11360 | || name == "Loaduint" || name == "Loaduintptr" || name == "LoadAcq" |
11361 | || name == "$Loadint32") | |
daccb2bc | 11362 | && this->args_ != NULL && this->args_->size() == 1) |
11363 | { | |
11364 | if (int_size < 8 && (name == "Load64" || name == "Loadint64")) | |
11365 | // On 32-bit architectures we need to check alignment. | |
11366 | // Not intrinsify for now. | |
11367 | return NULL; | |
11368 | ||
11369 | Runtime::Function code; | |
11370 | Type* res_type; | |
11371 | if (name == "Load") | |
11372 | { | |
11373 | code = Runtime::ATOMIC_LOAD_4; | |
11374 | res_type = uint32_type; | |
11375 | } | |
11376 | else if (name == "Load64") | |
11377 | { | |
11378 | code = Runtime::ATOMIC_LOAD_8; | |
11379 | res_type = uint64_type; | |
11380 | } | |
2f0168ee | 11381 | else if (name == "$Loadint32") |
11382 | { | |
11383 | code = Runtime::ATOMIC_LOAD_4; | |
11384 | res_type = int32_type; | |
11385 | } | |
daccb2bc | 11386 | else if (name == "Loadint64") |
11387 | { | |
11388 | code = Runtime::ATOMIC_LOAD_8; | |
11389 | res_type = int64_type; | |
11390 | } | |
11391 | else if (name == "Loaduint") | |
11392 | { | |
11393 | code = (int_size == 8 | |
11394 | ? Runtime::ATOMIC_LOAD_8 | |
11395 | : Runtime::ATOMIC_LOAD_4); | |
11396 | res_type = uint_type; | |
11397 | } | |
11398 | else if (name == "Loaduintptr") | |
11399 | { | |
11400 | code = (ptr_size == 8 | |
11401 | ? Runtime::ATOMIC_LOAD_8 | |
11402 | : Runtime::ATOMIC_LOAD_4); | |
11403 | res_type = uintptr_type; | |
11404 | } | |
11405 | else if (name == "Loadp") | |
11406 | { | |
11407 | code = (ptr_size == 8 | |
11408 | ? Runtime::ATOMIC_LOAD_8 | |
11409 | : Runtime::ATOMIC_LOAD_4); | |
11410 | res_type = pointer_type; | |
11411 | } | |
11412 | else if (name == "LoadAcq") | |
11413 | { | |
11414 | code = Runtime::ATOMIC_LOAD_4; | |
11415 | res_type = uint32_type; | |
11416 | memorder = __ATOMIC_ACQUIRE; | |
11417 | } | |
11418 | else | |
11419 | go_unreachable(); | |
11420 | Expression* a1 = this->args_->front(); | |
11421 | Expression* a2 = Expression::make_integer_ul(memorder, int32_type, loc); | |
11422 | Expression* call = Runtime::make_call(code, loc, 2, a1, a2); | |
11423 | return Expression::make_unsafe_cast(res_type, call, loc); | |
11424 | } | |
11425 | ||
11426 | if ((name == "Store" || name == "Store64" || name == "StorepNoWB" | |
2f0168ee | 11427 | || name == "Storeuintptr" || name == "StoreRel" |
11428 | || name == "$Storeint32" || name == "$Storeint64") | |
daccb2bc | 11429 | && this->args_ != NULL && this->args_->size() == 2) |
11430 | { | |
2f0168ee | 11431 | if (int_size < 8 && (name == "Store64" || name == "$Storeint64")) |
daccb2bc | 11432 | return NULL; |
11433 | ||
11434 | Runtime::Function code; | |
11435 | Expression* a1 = this->args_->at(0); | |
11436 | Expression* a2 = this->args_->at(1); | |
11437 | if (name == "Store") | |
11438 | code = Runtime::ATOMIC_STORE_4; | |
11439 | else if (name == "Store64") | |
11440 | code = Runtime::ATOMIC_STORE_8; | |
2f0168ee | 11441 | else if (name == "$Storeint32") |
11442 | code = Runtime::ATOMIC_STORE_4; | |
11443 | else if (name == "$Storeint64") | |
11444 | code = Runtime::ATOMIC_STORE_8; | |
daccb2bc | 11445 | else if (name == "Storeuintptr") |
11446 | code = (ptr_size == 8 ? Runtime::ATOMIC_STORE_8 : Runtime::ATOMIC_STORE_4); | |
11447 | else if (name == "StorepNoWB") | |
11448 | { | |
11449 | code = (ptr_size == 8 ? Runtime::ATOMIC_STORE_8 : Runtime::ATOMIC_STORE_4); | |
11450 | a2 = Expression::make_unsafe_cast(uintptr_type, a2, loc); | |
11451 | a2 = Expression::make_cast(uint64_type, a2, loc); | |
11452 | } | |
11453 | else if (name == "StoreRel") | |
11454 | { | |
11455 | code = Runtime::ATOMIC_STORE_4; | |
11456 | memorder = __ATOMIC_RELEASE; | |
11457 | } | |
11458 | else | |
11459 | go_unreachable(); | |
11460 | Expression* a3 = Expression::make_integer_ul(memorder, int32_type, loc); | |
11461 | return Runtime::make_call(code, loc, 3, a1, a2, a3); | |
11462 | } | |
11463 | ||
2f0168ee | 11464 | if ((name == "Xchg" || name == "Xchg64" || name == "Xchguintptr" |
11465 | || name == "$Xchgint32" || name == "$Xchgint64") | |
daccb2bc | 11466 | && this->args_ != NULL && this->args_->size() == 2) |
11467 | { | |
2f0168ee | 11468 | if (int_size < 8 && (name == "Xchg64" || name == "Xchgint64")) |
daccb2bc | 11469 | return NULL; |
11470 | ||
11471 | Runtime::Function code; | |
11472 | Type* res_type; | |
11473 | if (name == "Xchg") | |
11474 | { | |
11475 | code = Runtime::ATOMIC_EXCHANGE_4; | |
11476 | res_type = uint32_type; | |
11477 | } | |
11478 | else if (name == "Xchg64") | |
11479 | { | |
11480 | code = Runtime::ATOMIC_EXCHANGE_8; | |
11481 | res_type = uint64_type; | |
11482 | } | |
2f0168ee | 11483 | else if (name == "$Xchgint32") |
11484 | { | |
11485 | code = Runtime::ATOMIC_EXCHANGE_4; | |
11486 | res_type = int32_type; | |
11487 | } | |
11488 | else if (name == "$Xchgint64") | |
11489 | { | |
11490 | code = Runtime::ATOMIC_EXCHANGE_8; | |
11491 | res_type = int64_type; | |
11492 | } | |
daccb2bc | 11493 | else if (name == "Xchguintptr") |
11494 | { | |
11495 | code = (ptr_size == 8 | |
11496 | ? Runtime::ATOMIC_EXCHANGE_8 | |
11497 | : Runtime::ATOMIC_EXCHANGE_4); | |
11498 | res_type = uintptr_type; | |
11499 | } | |
11500 | else | |
11501 | go_unreachable(); | |
11502 | Expression* a1 = this->args_->at(0); | |
11503 | Expression* a2 = this->args_->at(1); | |
11504 | Expression* a3 = Expression::make_integer_ul(memorder, int32_type, loc); | |
11505 | Expression* call = Runtime::make_call(code, loc, 3, a1, a2, a3); | |
11506 | return Expression::make_cast(res_type, call, loc); | |
11507 | } | |
11508 | ||
11509 | if ((name == "Cas" || name == "Cas64" || name == "Casuintptr" | |
2f0168ee | 11510 | || name == "Casp1" || name == "CasRel" |
11511 | || name == "$Casint32" || name == "$Casint64") | |
daccb2bc | 11512 | && this->args_ != NULL && this->args_->size() == 3) |
11513 | { | |
2f0168ee | 11514 | if (int_size < 8 && (name == "Cas64" || name == "$Casint64")) |
daccb2bc | 11515 | return NULL; |
11516 | ||
11517 | Runtime::Function code; | |
11518 | Expression* a1 = this->args_->at(0); | |
11519 | ||
11520 | // Builtin cas takes a pointer to the old value. | |
11521 | // Store it in a temporary and take the address. | |
11522 | Expression* a2 = this->args_->at(1); | |
11523 | Temporary_statement* ts = Statement::make_temporary(NULL, a2, loc); | |
11524 | inserter->insert(ts); | |
11525 | a2 = Expression::make_temporary_reference(ts, loc); | |
11526 | a2 = Expression::make_unary(OPERATOR_AND, a2, loc); | |
11527 | ||
11528 | Expression* a3 = this->args_->at(2); | |
11529 | if (name == "Cas") | |
11530 | code = Runtime::ATOMIC_COMPARE_EXCHANGE_4; | |
11531 | else if (name == "Cas64") | |
11532 | code = Runtime::ATOMIC_COMPARE_EXCHANGE_8; | |
2f0168ee | 11533 | else if (name == "$Casint32") |
11534 | code = Runtime::ATOMIC_COMPARE_EXCHANGE_4; | |
11535 | else if (name == "$Casint64") | |
11536 | code = Runtime::ATOMIC_COMPARE_EXCHANGE_8; | |
daccb2bc | 11537 | else if (name == "Casuintptr") |
11538 | code = (ptr_size == 8 | |
11539 | ? Runtime::ATOMIC_COMPARE_EXCHANGE_8 | |
11540 | : Runtime::ATOMIC_COMPARE_EXCHANGE_4); | |
11541 | else if (name == "Casp1") | |
11542 | { | |
11543 | code = (ptr_size == 8 | |
11544 | ? Runtime::ATOMIC_COMPARE_EXCHANGE_8 | |
11545 | : Runtime::ATOMIC_COMPARE_EXCHANGE_4); | |
11546 | a3 = Expression::make_unsafe_cast(uintptr_type, a3, loc); | |
11547 | a3 = Expression::make_cast(uint64_type, a3, loc); | |
11548 | } | |
11549 | else if (name == "CasRel") | |
11550 | { | |
11551 | code = Runtime::ATOMIC_COMPARE_EXCHANGE_4; | |
11552 | memorder = __ATOMIC_RELEASE; | |
11553 | } | |
11554 | else | |
11555 | go_unreachable(); | |
11556 | Expression* a4 = Expression::make_boolean(false, loc); | |
11557 | Expression* a5 = Expression::make_integer_ul(memorder, int32_type, loc); | |
11558 | Expression* a6 = Expression::make_integer_ul(__ATOMIC_RELAXED, int32_type, loc); | |
11559 | return Runtime::make_call(code, loc, 6, a1, a2, a3, a4, a5, a6); | |
11560 | } | |
11561 | ||
11562 | if ((name == "Xadd" || name == "Xadd64" || name == "Xaddint64" | |
2f0168ee | 11563 | || name == "Xadduintptr" || name == "$Xaddint32") |
daccb2bc | 11564 | && this->args_ != NULL && this->args_->size() == 2) |
11565 | { | |
11566 | if (int_size < 8 && (name == "Xadd64" || name == "Xaddint64")) | |
11567 | return NULL; | |
11568 | ||
11569 | Runtime::Function code; | |
11570 | Type* res_type; | |
11571 | if (name == "Xadd") | |
11572 | { | |
11573 | code = Runtime::ATOMIC_ADD_FETCH_4; | |
11574 | res_type = uint32_type; | |
11575 | } | |
11576 | else if (name == "Xadd64") | |
11577 | { | |
11578 | code = Runtime::ATOMIC_ADD_FETCH_8; | |
11579 | res_type = uint64_type; | |
11580 | } | |
2f0168ee | 11581 | else if (name == "$Xaddint32") |
11582 | { | |
11583 | code = Runtime::ATOMIC_ADD_FETCH_4; | |
11584 | res_type = int32_type; | |
11585 | } | |
daccb2bc | 11586 | else if (name == "Xaddint64") |
11587 | { | |
11588 | code = Runtime::ATOMIC_ADD_FETCH_8; | |
11589 | res_type = int64_type; | |
11590 | } | |
11591 | else if (name == "Xadduintptr") | |
11592 | { | |
11593 | code = (ptr_size == 8 | |
11594 | ? Runtime::ATOMIC_ADD_FETCH_8 | |
11595 | : Runtime::ATOMIC_ADD_FETCH_4); | |
11596 | res_type = uintptr_type; | |
11597 | } | |
11598 | else | |
11599 | go_unreachable(); | |
11600 | Expression* a1 = this->args_->at(0); | |
11601 | Expression* a2 = this->args_->at(1); | |
11602 | Expression* a3 = Expression::make_integer_ul(memorder, int32_type, loc); | |
11603 | Expression* call = Runtime::make_call(code, loc, 3, a1, a2, a3); | |
11604 | return Expression::make_cast(res_type, call, loc); | |
11605 | } | |
11606 | ||
11607 | if ((name == "And8" || name == "Or8") | |
11608 | && this->args_ != NULL && this->args_->size() == 2) | |
11609 | { | |
11610 | Runtime::Function code; | |
11611 | if (name == "And8") | |
11612 | code = Runtime::ATOMIC_AND_FETCH_1; | |
11613 | else if (name == "Or8") | |
11614 | code = Runtime::ATOMIC_OR_FETCH_1; | |
11615 | else | |
11616 | go_unreachable(); | |
11617 | Expression* a1 = this->args_->at(0); | |
11618 | Expression* a2 = this->args_->at(1); | |
11619 | Expression* a3 = Expression::make_integer_ul(memorder, int32_type, loc); | |
11620 | return Runtime::make_call(code, loc, 3, a1, a2, a3); | |
11621 | } | |
11622 | } | |
6c8a521f | 11623 | |
11624 | return NULL; | |
11625 | } | |
11626 | ||
e007b1eb | 11627 | // Make implicit type conversions explicit. |
11628 | ||
11629 | void | |
11630 | Call_expression::do_add_conversions() | |
11631 | { | |
11632 | // Skip call that requires a thunk. We generate conversions inside the thunk. | |
11633 | if (this->is_concurrent_ || this->is_deferred_) | |
11634 | return; | |
11635 | ||
11636 | if (this->args_ == NULL || this->args_->empty()) | |
11637 | return; | |
11638 | ||
11639 | Function_type* fntype = this->get_function_type(); | |
11640 | if (fntype == NULL) | |
11641 | { | |
11642 | go_assert(saw_errors()); | |
11643 | return; | |
11644 | } | |
11645 | if (fntype->parameters() == NULL || fntype->parameters()->empty()) | |
11646 | return; | |
11647 | ||
11648 | Location loc = this->location(); | |
11649 | Expression_list::iterator pa = this->args_->begin(); | |
11650 | Typed_identifier_list::const_iterator pp = fntype->parameters()->begin(); | |
11651 | bool is_interface_method = | |
11652 | this->fn_->interface_field_reference_expression() != NULL; | |
11653 | if (!is_interface_method && fntype->is_method()) | |
11654 | { | |
11655 | // Skip the receiver argument, which cannot be interface. | |
11656 | pa++; | |
11657 | } | |
11658 | for (; pa != this->args_->end(); ++pa, ++pp) | |
11659 | { | |
11660 | Type* pt = pp->type(); | |
11661 | if (!Type::are_identical(pt, (*pa)->type(), 0, NULL) | |
11662 | && pt->interface_type() != NULL) | |
11663 | *pa = Expression::make_cast(pt, *pa, loc); | |
11664 | } | |
11665 | } | |
11666 | ||
ceeb4318 | 11667 | // Get the function type. This can return NULL in error cases. |
e440a328 | 11668 | |
11669 | Function_type* | |
11670 | Call_expression::get_function_type() const | |
11671 | { | |
11672 | return this->fn_->type()->function_type(); | |
11673 | } | |
11674 | ||
11675 | // Return the number of values which this call will return. | |
11676 | ||
11677 | size_t | |
11678 | Call_expression::result_count() const | |
11679 | { | |
11680 | const Function_type* fntype = this->get_function_type(); | |
11681 | if (fntype == NULL) | |
11682 | return 0; | |
11683 | if (fntype->results() == NULL) | |
11684 | return 0; | |
11685 | return fntype->results()->size(); | |
11686 | } | |
11687 | ||
5731103c | 11688 | // Return the temporary that holds the result for a call with multiple |
11689 | // results. | |
ceeb4318 | 11690 | |
11691 | Temporary_statement* | |
5731103c | 11692 | Call_expression::results() const |
ceeb4318 | 11693 | { |
5731103c | 11694 | if (this->call_temp_ == NULL) |
cd238b8d | 11695 | { |
11696 | go_assert(saw_errors()); | |
11697 | return NULL; | |
11698 | } | |
5731103c | 11699 | return this->call_temp_; |
ceeb4318 | 11700 | } |
11701 | ||
1373401e | 11702 | // Set the number of results expected from a call expression. |
11703 | ||
11704 | void | |
11705 | Call_expression::set_expected_result_count(size_t count) | |
11706 | { | |
11707 | go_assert(this->expected_result_count_ == 0); | |
11708 | this->expected_result_count_ = count; | |
11709 | } | |
11710 | ||
e440a328 | 11711 | // Return whether this is a call to the predeclared function recover. |
11712 | ||
11713 | bool | |
11714 | Call_expression::is_recover_call() const | |
11715 | { | |
11716 | return this->do_is_recover_call(); | |
11717 | } | |
11718 | ||
11719 | // Set the argument to the recover function. | |
11720 | ||
11721 | void | |
11722 | Call_expression::set_recover_arg(Expression* arg) | |
11723 | { | |
11724 | this->do_set_recover_arg(arg); | |
11725 | } | |
11726 | ||
11727 | // Virtual functions also implemented by Builtin_call_expression. | |
11728 | ||
11729 | bool | |
11730 | Call_expression::do_is_recover_call() const | |
11731 | { | |
11732 | return false; | |
11733 | } | |
11734 | ||
11735 | void | |
11736 | Call_expression::do_set_recover_arg(Expression*) | |
11737 | { | |
c3e6f413 | 11738 | go_unreachable(); |
e440a328 | 11739 | } |
11740 | ||
ceeb4318 | 11741 | // We have found an error with this call expression; return true if |
11742 | // we should report it. | |
11743 | ||
11744 | bool | |
11745 | Call_expression::issue_error() | |
11746 | { | |
11747 | if (this->issued_error_) | |
11748 | return false; | |
11749 | else | |
11750 | { | |
11751 | this->issued_error_ = true; | |
11752 | return true; | |
11753 | } | |
11754 | } | |
11755 | ||
5bf8be8b | 11756 | // Whether or not this call contains errors, either in the call or the |
11757 | // arguments to the call. | |
11758 | ||
11759 | bool | |
11760 | Call_expression::is_erroneous_call() | |
11761 | { | |
11762 | if (this->is_error_expression() || this->fn()->is_error_expression()) | |
11763 | return true; | |
11764 | ||
11765 | if (this->args() == NULL) | |
11766 | return false; | |
11767 | for (Expression_list::iterator pa = this->args()->begin(); | |
11768 | pa != this->args()->end(); | |
11769 | ++pa) | |
11770 | { | |
11771 | if ((*pa)->type()->is_error_type() || (*pa)->is_error_expression()) | |
11772 | return true; | |
11773 | } | |
11774 | return false; | |
11775 | } | |
11776 | ||
e440a328 | 11777 | // Get the type. |
11778 | ||
11779 | Type* | |
11780 | Call_expression::do_type() | |
11781 | { | |
11782 | if (this->type_ != NULL) | |
11783 | return this->type_; | |
11784 | ||
11785 | Type* ret; | |
11786 | Function_type* fntype = this->get_function_type(); | |
11787 | if (fntype == NULL) | |
11788 | return Type::make_error_type(); | |
11789 | ||
11790 | const Typed_identifier_list* results = fntype->results(); | |
11791 | if (results == NULL) | |
11792 | ret = Type::make_void_type(); | |
11793 | else if (results->size() == 1) | |
11794 | ret = results->begin()->type(); | |
11795 | else | |
2801343b | 11796 | ret = Type::make_call_multiple_result_type(this); |
e440a328 | 11797 | |
11798 | this->type_ = ret; | |
11799 | ||
11800 | return this->type_; | |
11801 | } | |
11802 | ||
11803 | // Determine types for a call expression. We can use the function | |
11804 | // parameter types to set the types of the arguments. | |
11805 | ||
11806 | void | |
11807 | Call_expression::do_determine_type(const Type_context*) | |
11808 | { | |
fb94b0ca | 11809 | if (!this->determining_types()) |
11810 | return; | |
11811 | ||
e440a328 | 11812 | this->fn_->determine_type_no_context(); |
11813 | Function_type* fntype = this->get_function_type(); | |
11814 | const Typed_identifier_list* parameters = NULL; | |
11815 | if (fntype != NULL) | |
11816 | parameters = fntype->parameters(); | |
11817 | if (this->args_ != NULL) | |
11818 | { | |
11819 | Typed_identifier_list::const_iterator pt; | |
11820 | if (parameters != NULL) | |
11821 | pt = parameters->begin(); | |
09ea332d | 11822 | bool first = true; |
e440a328 | 11823 | for (Expression_list::const_iterator pa = this->args_->begin(); |
11824 | pa != this->args_->end(); | |
11825 | ++pa) | |
11826 | { | |
09ea332d | 11827 | if (first) |
11828 | { | |
11829 | first = false; | |
11830 | // If this is a method, the first argument is the | |
11831 | // receiver. | |
11832 | if (fntype != NULL && fntype->is_method()) | |
11833 | { | |
11834 | Type* rtype = fntype->receiver()->type(); | |
11835 | // The receiver is always passed as a pointer. | |
11836 | if (rtype->points_to() == NULL) | |
11837 | rtype = Type::make_pointer_type(rtype); | |
11838 | Type_context subcontext(rtype, false); | |
11839 | (*pa)->determine_type(&subcontext); | |
11840 | continue; | |
11841 | } | |
11842 | } | |
11843 | ||
e440a328 | 11844 | if (parameters != NULL && pt != parameters->end()) |
11845 | { | |
11846 | Type_context subcontext(pt->type(), false); | |
11847 | (*pa)->determine_type(&subcontext); | |
11848 | ++pt; | |
11849 | } | |
11850 | else | |
11851 | (*pa)->determine_type_no_context(); | |
11852 | } | |
11853 | } | |
11854 | } | |
11855 | ||
fb94b0ca | 11856 | // Called when determining types for a Call_expression. Return true |
11857 | // if we should go ahead, false if they have already been determined. | |
11858 | ||
11859 | bool | |
11860 | Call_expression::determining_types() | |
11861 | { | |
11862 | if (this->types_are_determined_) | |
11863 | return false; | |
11864 | else | |
11865 | { | |
11866 | this->types_are_determined_ = true; | |
11867 | return true; | |
11868 | } | |
11869 | } | |
11870 | ||
e440a328 | 11871 | // Check types for parameter I. |
11872 | ||
11873 | bool | |
11874 | Call_expression::check_argument_type(int i, const Type* parameter_type, | |
11875 | const Type* argument_type, | |
b13c66cd | 11876 | Location argument_location, |
e440a328 | 11877 | bool issued_error) |
11878 | { | |
11879 | std::string reason; | |
1eae365b | 11880 | if (!Type::are_assignable(parameter_type, argument_type, &reason)) |
e440a328 | 11881 | { |
11882 | if (!issued_error) | |
11883 | { | |
11884 | if (reason.empty()) | |
631d5788 | 11885 | go_error_at(argument_location, "argument %d has incompatible type", i); |
e440a328 | 11886 | else |
631d5788 | 11887 | go_error_at(argument_location, |
11888 | "argument %d has incompatible type (%s)", | |
11889 | i, reason.c_str()); | |
e440a328 | 11890 | } |
11891 | this->set_is_error(); | |
11892 | return false; | |
11893 | } | |
11894 | return true; | |
11895 | } | |
11896 | ||
11897 | // Check types. | |
11898 | ||
11899 | void | |
11900 | Call_expression::do_check_types(Gogo*) | |
11901 | { | |
a6645f74 | 11902 | if (this->classification() == EXPRESSION_ERROR) |
11903 | return; | |
11904 | ||
e440a328 | 11905 | Function_type* fntype = this->get_function_type(); |
11906 | if (fntype == NULL) | |
11907 | { | |
5c13bd80 | 11908 | if (!this->fn_->type()->is_error()) |
e440a328 | 11909 | this->report_error(_("expected function")); |
11910 | return; | |
11911 | } | |
11912 | ||
1373401e | 11913 | if (this->expected_result_count_ != 0 |
11914 | && this->expected_result_count_ != this->result_count()) | |
11915 | { | |
11916 | if (this->issue_error()) | |
11917 | this->report_error(_("function result count mismatch")); | |
11918 | this->set_is_error(); | |
11919 | return; | |
11920 | } | |
11921 | ||
09ea332d | 11922 | bool is_method = fntype->is_method(); |
11923 | if (is_method) | |
e440a328 | 11924 | { |
09ea332d | 11925 | go_assert(this->args_ != NULL && !this->args_->empty()); |
11926 | Type* rtype = fntype->receiver()->type(); | |
11927 | Expression* first_arg = this->args_->front(); | |
1eae365b | 11928 | // We dereference the values since receivers are always passed |
11929 | // as pointers. | |
09ea332d | 11930 | std::string reason; |
1eae365b | 11931 | if (!Type::are_assignable(rtype->deref(), first_arg->type()->deref(), |
11932 | &reason)) | |
e440a328 | 11933 | { |
09ea332d | 11934 | if (reason.empty()) |
11935 | this->report_error(_("incompatible type for receiver")); | |
11936 | else | |
e440a328 | 11937 | { |
631d5788 | 11938 | go_error_at(this->location(), |
11939 | "incompatible type for receiver (%s)", | |
11940 | reason.c_str()); | |
09ea332d | 11941 | this->set_is_error(); |
e440a328 | 11942 | } |
11943 | } | |
11944 | } | |
11945 | ||
11946 | // Note that varargs was handled by the lower_varargs() method, so | |
a6645f74 | 11947 | // we don't have to worry about it here unless something is wrong. |
11948 | if (this->is_varargs_ && !this->varargs_are_lowered_) | |
11949 | { | |
11950 | if (!fntype->is_varargs()) | |
11951 | { | |
631d5788 | 11952 | go_error_at(this->location(), |
11953 | _("invalid use of %<...%> calling non-variadic function")); | |
a6645f74 | 11954 | this->set_is_error(); |
11955 | return; | |
11956 | } | |
11957 | } | |
e440a328 | 11958 | |
11959 | const Typed_identifier_list* parameters = fntype->parameters(); | |
33d1d391 | 11960 | if (this->args_ == NULL || this->args_->size() == 0) |
e440a328 | 11961 | { |
11962 | if (parameters != NULL && !parameters->empty()) | |
11963 | this->report_error(_("not enough arguments")); | |
11964 | } | |
11965 | else if (parameters == NULL) | |
09ea332d | 11966 | { |
11967 | if (!is_method || this->args_->size() > 1) | |
11968 | this->report_error(_("too many arguments")); | |
11969 | } | |
1373401e | 11970 | else if (this->args_->size() == 1 |
11971 | && this->args_->front()->call_expression() != NULL | |
11972 | && this->args_->front()->call_expression()->result_count() > 1) | |
11973 | { | |
11974 | // This is F(G()) when G returns more than one result. If the | |
11975 | // results can be matched to parameters, it would have been | |
11976 | // lowered in do_lower. If we get here we know there is a | |
11977 | // mismatch. | |
11978 | if (this->args_->front()->call_expression()->result_count() | |
11979 | < parameters->size()) | |
11980 | this->report_error(_("not enough arguments")); | |
11981 | else | |
11982 | this->report_error(_("too many arguments")); | |
11983 | } | |
e440a328 | 11984 | else |
11985 | { | |
11986 | int i = 0; | |
09ea332d | 11987 | Expression_list::const_iterator pa = this->args_->begin(); |
11988 | if (is_method) | |
11989 | ++pa; | |
11990 | for (Typed_identifier_list::const_iterator pt = parameters->begin(); | |
11991 | pt != parameters->end(); | |
11992 | ++pt, ++pa, ++i) | |
e440a328 | 11993 | { |
09ea332d | 11994 | if (pa == this->args_->end()) |
e440a328 | 11995 | { |
09ea332d | 11996 | this->report_error(_("not enough arguments")); |
e440a328 | 11997 | return; |
11998 | } | |
11999 | this->check_argument_type(i + 1, pt->type(), (*pa)->type(), | |
12000 | (*pa)->location(), false); | |
12001 | } | |
09ea332d | 12002 | if (pa != this->args_->end()) |
12003 | this->report_error(_("too many arguments")); | |
e440a328 | 12004 | } |
12005 | } | |
12006 | ||
72666aed | 12007 | Expression* |
12008 | Call_expression::do_copy() | |
12009 | { | |
12010 | Call_expression* call = | |
12011 | Expression::make_call(this->fn_->copy(), | |
12012 | (this->args_ == NULL | |
12013 | ? NULL | |
12014 | : this->args_->copy()), | |
12015 | this->is_varargs_, this->location()); | |
12016 | ||
12017 | if (this->varargs_are_lowered_) | |
12018 | call->set_varargs_are_lowered(); | |
28819633 | 12019 | if (this->is_deferred_) |
12020 | call->set_is_deferred(); | |
12021 | if (this->is_concurrent_) | |
12022 | call->set_is_concurrent(); | |
72666aed | 12023 | return call; |
12024 | } | |
12025 | ||
e440a328 | 12026 | // Return whether we have to use a temporary variable to ensure that |
12027 | // we evaluate this call expression in order. If the call returns no | |
ceeb4318 | 12028 | // results then it will inevitably be executed last. |
e440a328 | 12029 | |
12030 | bool | |
12031 | Call_expression::do_must_eval_in_order() const | |
12032 | { | |
ceeb4318 | 12033 | return this->result_count() > 0; |
e440a328 | 12034 | } |
12035 | ||
e440a328 | 12036 | // Get the function and the first argument to use when calling an |
12037 | // interface method. | |
12038 | ||
2387f644 | 12039 | Expression* |
e440a328 | 12040 | Call_expression::interface_method_function( |
e440a328 | 12041 | Interface_field_reference_expression* interface_method, |
db122cb9 | 12042 | Expression** first_arg_ptr, |
12043 | Location location) | |
e440a328 | 12044 | { |
db122cb9 | 12045 | Expression* object = interface_method->get_underlying_object(); |
12046 | Type* unsafe_ptr_type = Type::make_pointer_type(Type::make_void_type()); | |
12047 | *first_arg_ptr = | |
12048 | Expression::make_unsafe_cast(unsafe_ptr_type, object, location); | |
2387f644 | 12049 | return interface_method->get_function(); |
e440a328 | 12050 | } |
12051 | ||
12052 | // Build the call expression. | |
12053 | ||
ea664253 | 12054 | Bexpression* |
12055 | Call_expression::do_get_backend(Translate_context* context) | |
e440a328 | 12056 | { |
5731103c | 12057 | Location location = this->location(); |
12058 | ||
2c809f8f | 12059 | if (this->call_ != NULL) |
5731103c | 12060 | { |
12061 | // If the call returns multiple results, make a new reference to | |
12062 | // the temporary. | |
12063 | if (this->call_temp_ != NULL) | |
12064 | { | |
12065 | Expression* ref = | |
12066 | Expression::make_temporary_reference(this->call_temp_, location); | |
12067 | return ref->get_backend(context); | |
12068 | } | |
12069 | ||
12070 | return this->call_; | |
12071 | } | |
e440a328 | 12072 | |
12073 | Function_type* fntype = this->get_function_type(); | |
12074 | if (fntype == NULL) | |
ea664253 | 12075 | return context->backend()->error_expression(); |
e440a328 | 12076 | |
12077 | if (this->fn_->is_error_expression()) | |
ea664253 | 12078 | return context->backend()->error_expression(); |
e440a328 | 12079 | |
12080 | Gogo* gogo = context->gogo(); | |
e440a328 | 12081 | |
12082 | Func_expression* func = this->fn_->func_expression(); | |
e440a328 | 12083 | Interface_field_reference_expression* interface_method = |
12084 | this->fn_->interface_field_reference_expression(); | |
12085 | const bool has_closure = func != NULL && func->closure() != NULL; | |
09ea332d | 12086 | const bool is_interface_method = interface_method != NULL; |
e440a328 | 12087 | |
f8bdf81a | 12088 | bool has_closure_arg; |
8381eda7 | 12089 | if (has_closure) |
f8bdf81a | 12090 | has_closure_arg = true; |
8381eda7 | 12091 | else if (func != NULL) |
f8bdf81a | 12092 | has_closure_arg = false; |
8381eda7 | 12093 | else if (is_interface_method) |
f8bdf81a | 12094 | has_closure_arg = false; |
8381eda7 | 12095 | else |
f8bdf81a | 12096 | has_closure_arg = true; |
8381eda7 | 12097 | |
fa502e3a | 12098 | Expression* first_arg = NULL; |
12099 | if (!is_interface_method && fntype->is_method()) | |
12100 | { | |
12101 | first_arg = this->args_->front(); | |
12102 | if (first_arg->type()->points_to() == NULL | |
12103 | && first_arg->type()->is_direct_iface_type()) | |
12104 | first_arg = Expression::unpack_direct_iface(first_arg, | |
12105 | first_arg->location()); | |
12106 | } | |
12107 | ||
e440a328 | 12108 | int nargs; |
2c809f8f | 12109 | std::vector<Bexpression*> fn_args; |
e440a328 | 12110 | if (this->args_ == NULL || this->args_->empty()) |
12111 | { | |
f8bdf81a | 12112 | nargs = is_interface_method ? 1 : 0; |
2c809f8f | 12113 | if (nargs > 0) |
12114 | fn_args.resize(1); | |
e440a328 | 12115 | } |
09ea332d | 12116 | else if (fntype->parameters() == NULL || fntype->parameters()->empty()) |
12117 | { | |
12118 | // Passing a receiver parameter. | |
12119 | go_assert(!is_interface_method | |
12120 | && fntype->is_method() | |
12121 | && this->args_->size() == 1); | |
f8bdf81a | 12122 | nargs = 1; |
2c809f8f | 12123 | fn_args.resize(1); |
fa502e3a | 12124 | fn_args[0] = first_arg->get_backend(context); |
09ea332d | 12125 | } |
e440a328 | 12126 | else |
12127 | { | |
12128 | const Typed_identifier_list* params = fntype->parameters(); | |
e440a328 | 12129 | |
12130 | nargs = this->args_->size(); | |
09ea332d | 12131 | int i = is_interface_method ? 1 : 0; |
e440a328 | 12132 | nargs += i; |
2c809f8f | 12133 | fn_args.resize(nargs); |
e440a328 | 12134 | |
12135 | Typed_identifier_list::const_iterator pp = params->begin(); | |
09ea332d | 12136 | Expression_list::const_iterator pe = this->args_->begin(); |
12137 | if (!is_interface_method && fntype->is_method()) | |
12138 | { | |
fa502e3a | 12139 | fn_args[i] = first_arg->get_backend(context); |
09ea332d | 12140 | ++pe; |
12141 | ++i; | |
12142 | } | |
12143 | for (; pe != this->args_->end(); ++pe, ++pp, ++i) | |
e440a328 | 12144 | { |
c484d925 | 12145 | go_assert(pp != params->end()); |
2c809f8f | 12146 | Expression* arg = |
12147 | Expression::convert_for_assignment(gogo, pp->type(), *pe, | |
12148 | location); | |
ea664253 | 12149 | fn_args[i] = arg->get_backend(context); |
e440a328 | 12150 | } |
c484d925 | 12151 | go_assert(pp == params->end()); |
f8bdf81a | 12152 | go_assert(i == nargs); |
e440a328 | 12153 | } |
12154 | ||
2c809f8f | 12155 | Expression* fn; |
12156 | Expression* closure = NULL; | |
8381eda7 | 12157 | if (func != NULL) |
12158 | { | |
12159 | Named_object* no = func->named_object(); | |
2c809f8f | 12160 | fn = Expression::make_func_code_reference(no, location); |
12161 | if (has_closure) | |
12162 | closure = func->closure(); | |
8381eda7 | 12163 | } |
09ea332d | 12164 | else if (!is_interface_method) |
8381eda7 | 12165 | { |
2c809f8f | 12166 | closure = this->fn_; |
12167 | ||
12168 | // The backend representation of this function type is a pointer | |
12169 | // to a struct whose first field is the actual function to call. | |
12170 | Type* pfntype = | |
12171 | Type::make_pointer_type( | |
12172 | Type::make_pointer_type(Type::make_void_type())); | |
12173 | fn = Expression::make_unsafe_cast(pfntype, this->fn_, location); | |
f614ea8b | 12174 | fn = Expression::make_dereference(fn, NIL_CHECK_NOT_NEEDED, location); |
2c809f8f | 12175 | } |
e440a328 | 12176 | else |
cf609de4 | 12177 | { |
2387f644 | 12178 | Expression* first_arg; |
db122cb9 | 12179 | fn = this->interface_method_function(interface_method, &first_arg, |
12180 | location); | |
ea664253 | 12181 | fn_args[0] = first_arg->get_backend(context); |
e440a328 | 12182 | } |
12183 | ||
1ecc6157 | 12184 | Bexpression* bclosure = NULL; |
12185 | if (has_closure_arg) | |
12186 | bclosure = closure->get_backend(context); | |
f8bdf81a | 12187 | else |
1ecc6157 | 12188 | go_assert(closure == NULL); |
f8bdf81a | 12189 | |
ea664253 | 12190 | Bexpression* bfn = fn->get_backend(context); |
80d1e1a8 | 12191 | |
12192 | // When not calling a named function directly, use a type conversion | |
12193 | // in case the type of the function is a recursive type which refers | |
12194 | // to itself. We don't do this for an interface method because 1) | |
12195 | // an interface method never refers to itself, so we always have a | |
12196 | // function type here; 2) we pass an extra first argument to an | |
12197 | // interface method, so fntype is not correct. | |
12198 | if (func == NULL && !is_interface_method) | |
12199 | { | |
12200 | Btype* bft = fntype->get_backend_fntype(gogo); | |
12201 | bfn = gogo->backend()->convert_expression(bft, bfn, location); | |
12202 | } | |
12203 | ||
4ced7af9 | 12204 | Bfunction* bfunction = NULL; |
12205 | if (context->function()) | |
12206 | bfunction = context->function()->func_value()->get_decl(); | |
12207 | Bexpression* call = gogo->backend()->call_expression(bfunction, bfn, | |
12208 | fn_args, bclosure, | |
12209 | location); | |
e440a328 | 12210 | |
5731103c | 12211 | if (this->call_temp_ != NULL) |
e440a328 | 12212 | { |
5731103c | 12213 | // This case occurs when the call returns multiple results. |
e440a328 | 12214 | |
5731103c | 12215 | Expression* ref = Expression::make_temporary_reference(this->call_temp_, |
12216 | location); | |
12217 | Bexpression* bref = ref->get_backend(context); | |
12218 | Bstatement* bassn = gogo->backend()->assignment_statement(bfunction, | |
12219 | bref, call, | |
12220 | location); | |
e440a328 | 12221 | |
5731103c | 12222 | ref = Expression::make_temporary_reference(this->call_temp_, location); |
12223 | this->call_ = ref->get_backend(context); | |
12224 | ||
12225 | return gogo->backend()->compound_expression(bassn, this->call_, | |
12226 | location); | |
2c809f8f | 12227 | } |
e440a328 | 12228 | |
2c809f8f | 12229 | this->call_ = call; |
ea664253 | 12230 | return this->call_; |
e440a328 | 12231 | } |
12232 | ||
e3d09834 | 12233 | // The cost of inlining a call expression. |
12234 | ||
12235 | int | |
12236 | Call_expression::do_inlining_cost() const | |
12237 | { | |
12238 | Func_expression* fn = this->fn_->func_expression(); | |
12239 | ||
12240 | // FIXME: We don't yet support all kinds of calls. | |
12241 | if (fn != NULL && fn->closure() != NULL) | |
12242 | return 0x100000; | |
12243 | if (this->fn_->interface_field_reference_expression()) | |
12244 | return 0x100000; | |
12245 | if (this->get_function_type()->is_method()) | |
12246 | return 0x100000; | |
12247 | ||
12248 | return 5; | |
12249 | } | |
12250 | ||
12251 | // Export a call expression. | |
12252 | ||
12253 | void | |
12254 | Call_expression::do_export(Export_function_body* efb) const | |
12255 | { | |
12256 | this->fn_->export_expression(efb); | |
12257 | this->export_arguments(efb); | |
12258 | } | |
12259 | ||
12260 | // Export call expression arguments. | |
12261 | ||
12262 | void | |
12263 | Call_expression::export_arguments(Export_function_body* efb) const | |
12264 | { | |
12265 | efb->write_c_string("("); | |
12266 | if (this->args_ != NULL && !this->args_->empty()) | |
12267 | { | |
12268 | Expression_list::const_iterator pa = this->args_->begin(); | |
12269 | (*pa)->export_expression(efb); | |
12270 | for (pa++; pa != this->args_->end(); pa++) | |
12271 | { | |
12272 | efb->write_c_string(", "); | |
12273 | (*pa)->export_expression(efb); | |
12274 | } | |
12275 | if (this->is_varargs_) | |
12276 | efb->write_c_string("..."); | |
12277 | } | |
12278 | efb->write_c_string(")"); | |
12279 | } | |
12280 | ||
12281 | // Dump ast representation for a call expression. | |
d751bb78 | 12282 | |
12283 | void | |
12284 | Call_expression::do_dump_expression(Ast_dump_context* ast_dump_context) const | |
12285 | { | |
12286 | this->fn_->dump_expression(ast_dump_context); | |
12287 | ast_dump_context->ostream() << "("; | |
12288 | if (args_ != NULL) | |
12289 | ast_dump_context->dump_expression_list(this->args_); | |
12290 | ||
12291 | ast_dump_context->ostream() << ") "; | |
12292 | } | |
12293 | ||
e440a328 | 12294 | // Make a call expression. |
12295 | ||
12296 | Call_expression* | |
12297 | Expression::make_call(Expression* fn, Expression_list* args, bool is_varargs, | |
b13c66cd | 12298 | Location location) |
e440a328 | 12299 | { |
12300 | return new Call_expression(fn, args, is_varargs, location); | |
12301 | } | |
12302 | ||
da244e59 | 12303 | // Class Call_result_expression. |
e440a328 | 12304 | |
12305 | // Traverse a call result. | |
12306 | ||
12307 | int | |
12308 | Call_result_expression::do_traverse(Traverse* traverse) | |
12309 | { | |
12310 | if (traverse->remember_expression(this->call_)) | |
12311 | { | |
12312 | // We have already traversed the call expression. | |
12313 | return TRAVERSE_CONTINUE; | |
12314 | } | |
12315 | return Expression::traverse(&this->call_, traverse); | |
12316 | } | |
12317 | ||
12318 | // Get the type. | |
12319 | ||
12320 | Type* | |
12321 | Call_result_expression::do_type() | |
12322 | { | |
425dd051 | 12323 | if (this->classification() == EXPRESSION_ERROR) |
12324 | return Type::make_error_type(); | |
12325 | ||
e440a328 | 12326 | // THIS->CALL_ can be replaced with a temporary reference due to |
12327 | // Call_expression::do_must_eval_in_order when there is an error. | |
12328 | Call_expression* ce = this->call_->call_expression(); | |
12329 | if (ce == NULL) | |
5e85f268 | 12330 | { |
12331 | this->set_is_error(); | |
12332 | return Type::make_error_type(); | |
12333 | } | |
e440a328 | 12334 | Function_type* fntype = ce->get_function_type(); |
12335 | if (fntype == NULL) | |
5e85f268 | 12336 | { |
e37658e2 | 12337 | if (ce->issue_error()) |
99b3f06f | 12338 | { |
12339 | if (!ce->fn()->type()->is_error()) | |
12340 | this->report_error(_("expected function")); | |
12341 | } | |
5e85f268 | 12342 | this->set_is_error(); |
12343 | return Type::make_error_type(); | |
12344 | } | |
e440a328 | 12345 | const Typed_identifier_list* results = fntype->results(); |
ceeb4318 | 12346 | if (results == NULL || results->size() < 2) |
7b8d861f | 12347 | { |
ceeb4318 | 12348 | if (ce->issue_error()) |
12349 | this->report_error(_("number of results does not match " | |
12350 | "number of values")); | |
7b8d861f | 12351 | return Type::make_error_type(); |
12352 | } | |
e440a328 | 12353 | Typed_identifier_list::const_iterator pr = results->begin(); |
12354 | for (unsigned int i = 0; i < this->index_; ++i) | |
12355 | { | |
12356 | if (pr == results->end()) | |
425dd051 | 12357 | break; |
e440a328 | 12358 | ++pr; |
12359 | } | |
12360 | if (pr == results->end()) | |
425dd051 | 12361 | { |
ceeb4318 | 12362 | if (ce->issue_error()) |
12363 | this->report_error(_("number of results does not match " | |
12364 | "number of values")); | |
425dd051 | 12365 | return Type::make_error_type(); |
12366 | } | |
e440a328 | 12367 | return pr->type(); |
12368 | } | |
12369 | ||
425dd051 | 12370 | // Check the type. Just make sure that we trigger the warning in |
12371 | // do_type. | |
e440a328 | 12372 | |
12373 | void | |
12374 | Call_result_expression::do_check_types(Gogo*) | |
12375 | { | |
425dd051 | 12376 | this->type(); |
e440a328 | 12377 | } |
12378 | ||
12379 | // Determine the type. We have nothing to do here, but the 0 result | |
12380 | // needs to pass down to the caller. | |
12381 | ||
12382 | void | |
12383 | Call_result_expression::do_determine_type(const Type_context*) | |
12384 | { | |
fb94b0ca | 12385 | this->call_->determine_type_no_context(); |
e440a328 | 12386 | } |
12387 | ||
ea664253 | 12388 | // Return the backend representation. We just refer to the temporary set by the |
12389 | // call expression. We don't do this at lowering time because it makes it | |
ceeb4318 | 12390 | // hard to evaluate the call at the right time. |
e440a328 | 12391 | |
ea664253 | 12392 | Bexpression* |
12393 | Call_result_expression::do_get_backend(Translate_context* context) | |
e440a328 | 12394 | { |
ceeb4318 | 12395 | Call_expression* ce = this->call_->call_expression(); |
cd238b8d | 12396 | if (ce == NULL) |
12397 | { | |
12398 | go_assert(this->call_->is_error_expression()); | |
ea664253 | 12399 | return context->backend()->error_expression(); |
cd238b8d | 12400 | } |
5731103c | 12401 | Temporary_statement* ts = ce->results(); |
cd238b8d | 12402 | if (ts == NULL) |
12403 | { | |
12404 | go_assert(saw_errors()); | |
ea664253 | 12405 | return context->backend()->error_expression(); |
cd238b8d | 12406 | } |
ceeb4318 | 12407 | Expression* ref = Expression::make_temporary_reference(ts, this->location()); |
5731103c | 12408 | ref = Expression::make_field_reference(ref, this->index_, this->location()); |
ea664253 | 12409 | return ref->get_backend(context); |
e440a328 | 12410 | } |
12411 | ||
d751bb78 | 12412 | // Dump ast representation for a call result expression. |
12413 | ||
12414 | void | |
12415 | Call_result_expression::do_dump_expression(Ast_dump_context* ast_dump_context) | |
12416 | const | |
12417 | { | |
f03a9fbf | 12418 | // FIXME: Wouldn't it be better if the call is assigned to a temporary |
d751bb78 | 12419 | // (struct) and the fields are referenced instead. |
12420 | ast_dump_context->ostream() << this->index_ << "@("; | |
12421 | ast_dump_context->dump_expression(this->call_); | |
12422 | ast_dump_context->ostream() << ")"; | |
12423 | } | |
12424 | ||
e440a328 | 12425 | // Make a reference to a single result of a call which returns |
12426 | // multiple results. | |
12427 | ||
12428 | Expression* | |
12429 | Expression::make_call_result(Call_expression* call, unsigned int index) | |
12430 | { | |
12431 | return new Call_result_expression(call, index); | |
12432 | } | |
12433 | ||
12434 | // Class Index_expression. | |
12435 | ||
12436 | // Traversal. | |
12437 | ||
12438 | int | |
12439 | Index_expression::do_traverse(Traverse* traverse) | |
12440 | { | |
12441 | if (Expression::traverse(&this->left_, traverse) == TRAVERSE_EXIT | |
12442 | || Expression::traverse(&this->start_, traverse) == TRAVERSE_EXIT | |
12443 | || (this->end_ != NULL | |
acf2b673 | 12444 | && Expression::traverse(&this->end_, traverse) == TRAVERSE_EXIT) |
12445 | || (this->cap_ != NULL | |
12446 | && Expression::traverse(&this->cap_, traverse) == TRAVERSE_EXIT)) | |
e440a328 | 12447 | return TRAVERSE_EXIT; |
12448 | return TRAVERSE_CONTINUE; | |
12449 | } | |
12450 | ||
12451 | // Lower an index expression. This converts the generic index | |
12452 | // expression into an array index, a string index, or a map index. | |
12453 | ||
12454 | Expression* | |
ceeb4318 | 12455 | Index_expression::do_lower(Gogo*, Named_object*, Statement_inserter*, int) |
e440a328 | 12456 | { |
b13c66cd | 12457 | Location location = this->location(); |
e440a328 | 12458 | Expression* left = this->left_; |
12459 | Expression* start = this->start_; | |
12460 | Expression* end = this->end_; | |
acf2b673 | 12461 | Expression* cap = this->cap_; |
e440a328 | 12462 | |
12463 | Type* type = left->type(); | |
5c13bd80 | 12464 | if (type->is_error()) |
d9f3743a | 12465 | { |
12466 | go_assert(saw_errors()); | |
12467 | return Expression::make_error(location); | |
12468 | } | |
b0cf7ddd | 12469 | else if (left->is_type_expression()) |
12470 | { | |
631d5788 | 12471 | go_error_at(location, "attempt to index type expression"); |
b0cf7ddd | 12472 | return Expression::make_error(location); |
12473 | } | |
e440a328 | 12474 | else if (type->array_type() != NULL) |
acf2b673 | 12475 | return Expression::make_array_index(left, start, end, cap, location); |
e440a328 | 12476 | else if (type->points_to() != NULL |
12477 | && type->points_to()->array_type() != NULL | |
411eb89e | 12478 | && !type->points_to()->is_slice_type()) |
e440a328 | 12479 | { |
f614ea8b | 12480 | Expression* deref = |
12481 | Expression::make_dereference(left, NIL_CHECK_DEFAULT, location); | |
38092374 | 12482 | |
12483 | // For an ordinary index into the array, the pointer will be | |
12484 | // dereferenced. For a slice it will not--the resulting slice | |
12485 | // will simply reuse the pointer, which is incorrect if that | |
12486 | // pointer is nil. | |
12487 | if (end != NULL || cap != NULL) | |
12488 | deref->issue_nil_check(); | |
12489 | ||
acf2b673 | 12490 | return Expression::make_array_index(deref, start, end, cap, location); |
e440a328 | 12491 | } |
12492 | else if (type->is_string_type()) | |
acf2b673 | 12493 | { |
12494 | if (cap != NULL) | |
12495 | { | |
631d5788 | 12496 | go_error_at(location, "invalid 3-index slice of string"); |
acf2b673 | 12497 | return Expression::make_error(location); |
12498 | } | |
12499 | return Expression::make_string_index(left, start, end, location); | |
12500 | } | |
e440a328 | 12501 | else if (type->map_type() != NULL) |
12502 | { | |
acf2b673 | 12503 | if (end != NULL || cap != NULL) |
e440a328 | 12504 | { |
631d5788 | 12505 | go_error_at(location, "invalid slice of map"); |
e440a328 | 12506 | return Expression::make_error(location); |
12507 | } | |
0d5530d9 | 12508 | return Expression::make_map_index(left, start, location); |
e440a328 | 12509 | } |
b1aba207 | 12510 | else if (cap != NULL) |
12511 | { | |
12512 | go_error_at(location, | |
12513 | "invalid 3-index slice of object that is not a slice"); | |
12514 | return Expression::make_error(location); | |
12515 | } | |
12516 | else if (end != NULL) | |
12517 | { | |
12518 | go_error_at(location, | |
12519 | ("attempt to slice object that is not " | |
12520 | "array, slice, or string")); | |
12521 | return Expression::make_error(location); | |
12522 | } | |
e440a328 | 12523 | else |
12524 | { | |
631d5788 | 12525 | go_error_at(location, |
b1aba207 | 12526 | ("attempt to index object that is not " |
12527 | "array, slice, string, or map")); | |
e440a328 | 12528 | return Expression::make_error(location); |
12529 | } | |
12530 | } | |
12531 | ||
acf2b673 | 12532 | // Write an indexed expression |
12533 | // (expr[expr:expr:expr], expr[expr:expr] or expr[expr]) to a dump context. | |
d751bb78 | 12534 | |
12535 | void | |
f03a9fbf | 12536 | Index_expression::dump_index_expression(Ast_dump_context* ast_dump_context, |
12537 | const Expression* expr, | |
d751bb78 | 12538 | const Expression* start, |
acf2b673 | 12539 | const Expression* end, |
12540 | const Expression* cap) | |
d751bb78 | 12541 | { |
12542 | expr->dump_expression(ast_dump_context); | |
12543 | ast_dump_context->ostream() << "["; | |
12544 | start->dump_expression(ast_dump_context); | |
12545 | if (end != NULL) | |
12546 | { | |
12547 | ast_dump_context->ostream() << ":"; | |
12548 | end->dump_expression(ast_dump_context); | |
12549 | } | |
acf2b673 | 12550 | if (cap != NULL) |
12551 | { | |
12552 | ast_dump_context->ostream() << ":"; | |
12553 | cap->dump_expression(ast_dump_context); | |
12554 | } | |
d751bb78 | 12555 | ast_dump_context->ostream() << "]"; |
12556 | } | |
12557 | ||
12558 | // Dump ast representation for an index expression. | |
12559 | ||
12560 | void | |
f03a9fbf | 12561 | Index_expression::do_dump_expression(Ast_dump_context* ast_dump_context) |
d751bb78 | 12562 | const |
12563 | { | |
f03a9fbf | 12564 | Index_expression::dump_index_expression(ast_dump_context, this->left_, |
acf2b673 | 12565 | this->start_, this->end_, this->cap_); |
d751bb78 | 12566 | } |
12567 | ||
e440a328 | 12568 | // Make an index expression. |
12569 | ||
12570 | Expression* | |
12571 | Expression::make_index(Expression* left, Expression* start, Expression* end, | |
acf2b673 | 12572 | Expression* cap, Location location) |
e440a328 | 12573 | { |
acf2b673 | 12574 | return new Index_expression(left, start, end, cap, location); |
e440a328 | 12575 | } |
12576 | ||
da244e59 | 12577 | // Class Array_index_expression. |
e440a328 | 12578 | |
12579 | // Array index traversal. | |
12580 | ||
12581 | int | |
12582 | Array_index_expression::do_traverse(Traverse* traverse) | |
12583 | { | |
12584 | if (Expression::traverse(&this->array_, traverse) == TRAVERSE_EXIT) | |
12585 | return TRAVERSE_EXIT; | |
12586 | if (Expression::traverse(&this->start_, traverse) == TRAVERSE_EXIT) | |
12587 | return TRAVERSE_EXIT; | |
12588 | if (this->end_ != NULL) | |
12589 | { | |
12590 | if (Expression::traverse(&this->end_, traverse) == TRAVERSE_EXIT) | |
12591 | return TRAVERSE_EXIT; | |
12592 | } | |
acf2b673 | 12593 | if (this->cap_ != NULL) |
12594 | { | |
12595 | if (Expression::traverse(&this->cap_, traverse) == TRAVERSE_EXIT) | |
12596 | return TRAVERSE_EXIT; | |
12597 | } | |
e440a328 | 12598 | return TRAVERSE_CONTINUE; |
12599 | } | |
12600 | ||
12601 | // Return the type of an array index. | |
12602 | ||
12603 | Type* | |
12604 | Array_index_expression::do_type() | |
12605 | { | |
12606 | if (this->type_ == NULL) | |
12607 | { | |
12608 | Array_type* type = this->array_->type()->array_type(); | |
12609 | if (type == NULL) | |
12610 | this->type_ = Type::make_error_type(); | |
12611 | else if (this->end_ == NULL) | |
12612 | this->type_ = type->element_type(); | |
411eb89e | 12613 | else if (type->is_slice_type()) |
e440a328 | 12614 | { |
12615 | // A slice of a slice has the same type as the original | |
12616 | // slice. | |
12617 | this->type_ = this->array_->type()->deref(); | |
12618 | } | |
12619 | else | |
12620 | { | |
12621 | // A slice of an array is a slice. | |
12622 | this->type_ = Type::make_array_type(type->element_type(), NULL); | |
12623 | } | |
12624 | } | |
12625 | return this->type_; | |
12626 | } | |
12627 | ||
12628 | // Set the type of an array index. | |
12629 | ||
12630 | void | |
12631 | Array_index_expression::do_determine_type(const Type_context*) | |
12632 | { | |
12633 | this->array_->determine_type_no_context(); | |
f77aa642 | 12634 | |
12635 | Type_context index_context(Type::lookup_integer_type("int"), false); | |
12636 | if (this->start_->is_constant()) | |
12637 | this->start_->determine_type(&index_context); | |
12638 | else | |
12639 | this->start_->determine_type_no_context(); | |
e440a328 | 12640 | if (this->end_ != NULL) |
f77aa642 | 12641 | { |
12642 | if (this->end_->is_constant()) | |
12643 | this->end_->determine_type(&index_context); | |
12644 | else | |
12645 | this->end_->determine_type_no_context(); | |
12646 | } | |
acf2b673 | 12647 | if (this->cap_ != NULL) |
f77aa642 | 12648 | { |
12649 | if (this->cap_->is_constant()) | |
12650 | this->cap_->determine_type(&index_context); | |
12651 | else | |
12652 | this->cap_->determine_type_no_context(); | |
12653 | } | |
e440a328 | 12654 | } |
12655 | ||
12656 | // Check types of an array index. | |
12657 | ||
12658 | void | |
b7327dbf | 12659 | Array_index_expression::do_check_types(Gogo*) |
e440a328 | 12660 | { |
f6bc81e6 | 12661 | Numeric_constant nc; |
12662 | unsigned long v; | |
12663 | if (this->start_->type()->integer_type() == NULL | |
12664 | && !this->start_->type()->is_error() | |
12665 | && (!this->start_->numeric_constant_value(&nc) | |
12666 | || nc.to_unsigned_long(&v) == Numeric_constant::NC_UL_NOTINT)) | |
e440a328 | 12667 | this->report_error(_("index must be integer")); |
12668 | if (this->end_ != NULL | |
12669 | && this->end_->type()->integer_type() == NULL | |
99b3f06f | 12670 | && !this->end_->type()->is_error() |
12671 | && !this->end_->is_nil_expression() | |
f6bc81e6 | 12672 | && !this->end_->is_error_expression() |
12673 | && (!this->end_->numeric_constant_value(&nc) | |
12674 | || nc.to_unsigned_long(&v) == Numeric_constant::NC_UL_NOTINT)) | |
e440a328 | 12675 | this->report_error(_("slice end must be integer")); |
acf2b673 | 12676 | if (this->cap_ != NULL |
12677 | && this->cap_->type()->integer_type() == NULL | |
12678 | && !this->cap_->type()->is_error() | |
12679 | && !this->cap_->is_nil_expression() | |
12680 | && !this->cap_->is_error_expression() | |
12681 | && (!this->cap_->numeric_constant_value(&nc) | |
12682 | || nc.to_unsigned_long(&v) == Numeric_constant::NC_UL_NOTINT)) | |
12683 | this->report_error(_("slice capacity must be integer")); | |
e440a328 | 12684 | |
12685 | Array_type* array_type = this->array_->type()->array_type(); | |
f9c68f17 | 12686 | if (array_type == NULL) |
12687 | { | |
c484d925 | 12688 | go_assert(this->array_->type()->is_error()); |
f9c68f17 | 12689 | return; |
12690 | } | |
e440a328 | 12691 | |
12692 | unsigned int int_bits = | |
12693 | Type::lookup_integer_type("int")->integer_type()->bits(); | |
12694 | ||
0c77715b | 12695 | Numeric_constant lvalnc; |
e440a328 | 12696 | mpz_t lval; |
e440a328 | 12697 | bool lval_valid = (array_type->length() != NULL |
0c77715b | 12698 | && array_type->length()->numeric_constant_value(&lvalnc) |
12699 | && lvalnc.to_int(&lval)); | |
12700 | Numeric_constant inc; | |
e440a328 | 12701 | mpz_t ival; |
0bd5d859 | 12702 | bool ival_valid = false; |
0c77715b | 12703 | if (this->start_->numeric_constant_value(&inc) && inc.to_int(&ival)) |
e440a328 | 12704 | { |
0bd5d859 | 12705 | ival_valid = true; |
e440a328 | 12706 | if (mpz_sgn(ival) < 0 |
12707 | || mpz_sizeinbase(ival, 2) >= int_bits | |
12708 | || (lval_valid | |
12709 | && (this->end_ == NULL | |
12710 | ? mpz_cmp(ival, lval) >= 0 | |
12711 | : mpz_cmp(ival, lval) > 0))) | |
12712 | { | |
631d5788 | 12713 | go_error_at(this->start_->location(), "array index out of bounds"); |
e440a328 | 12714 | this->set_is_error(); |
12715 | } | |
12716 | } | |
12717 | if (this->end_ != NULL && !this->end_->is_nil_expression()) | |
12718 | { | |
0c77715b | 12719 | Numeric_constant enc; |
12720 | mpz_t eval; | |
acf2b673 | 12721 | bool eval_valid = false; |
0c77715b | 12722 | if (this->end_->numeric_constant_value(&enc) && enc.to_int(&eval)) |
e440a328 | 12723 | { |
acf2b673 | 12724 | eval_valid = true; |
0c77715b | 12725 | if (mpz_sgn(eval) < 0 |
12726 | || mpz_sizeinbase(eval, 2) >= int_bits | |
12727 | || (lval_valid && mpz_cmp(eval, lval) > 0)) | |
e440a328 | 12728 | { |
631d5788 | 12729 | go_error_at(this->end_->location(), "array index out of bounds"); |
e440a328 | 12730 | this->set_is_error(); |
12731 | } | |
0bd5d859 | 12732 | else if (ival_valid && mpz_cmp(ival, eval) > 0) |
12733 | this->report_error(_("inverted slice range")); | |
e440a328 | 12734 | } |
acf2b673 | 12735 | |
12736 | Numeric_constant cnc; | |
12737 | mpz_t cval; | |
12738 | if (this->cap_ != NULL | |
12739 | && this->cap_->numeric_constant_value(&cnc) && cnc.to_int(&cval)) | |
12740 | { | |
12741 | if (mpz_sgn(cval) < 0 | |
12742 | || mpz_sizeinbase(cval, 2) >= int_bits | |
12743 | || (lval_valid && mpz_cmp(cval, lval) > 0)) | |
12744 | { | |
631d5788 | 12745 | go_error_at(this->cap_->location(), "array index out of bounds"); |
acf2b673 | 12746 | this->set_is_error(); |
12747 | } | |
12748 | else if (ival_valid && mpz_cmp(ival, cval) > 0) | |
12749 | { | |
631d5788 | 12750 | go_error_at(this->cap_->location(), |
12751 | "invalid slice index: capacity less than start"); | |
acf2b673 | 12752 | this->set_is_error(); |
12753 | } | |
12754 | else if (eval_valid && mpz_cmp(eval, cval) > 0) | |
12755 | { | |
631d5788 | 12756 | go_error_at(this->cap_->location(), |
12757 | "invalid slice index: capacity less than length"); | |
acf2b673 | 12758 | this->set_is_error(); |
12759 | } | |
12760 | mpz_clear(cval); | |
12761 | } | |
12762 | ||
12763 | if (eval_valid) | |
12764 | mpz_clear(eval); | |
e440a328 | 12765 | } |
0bd5d859 | 12766 | if (ival_valid) |
12767 | mpz_clear(ival); | |
0c77715b | 12768 | if (lval_valid) |
12769 | mpz_clear(lval); | |
e440a328 | 12770 | |
12771 | // A slice of an array requires an addressable array. A slice of a | |
12772 | // slice is always possible. | |
411eb89e | 12773 | if (this->end_ != NULL && !array_type->is_slice_type()) |
88ec30c8 | 12774 | { |
12775 | if (!this->array_->is_addressable()) | |
8da39c3b | 12776 | this->report_error(_("slice of unaddressable value")); |
88ec30c8 | 12777 | else |
b7327dbf | 12778 | // Set the array address taken but not escape. The escape |
12779 | // analysis will make it escape to heap when needed. | |
12780 | this->array_->address_taken(false); | |
88ec30c8 | 12781 | } |
e440a328 | 12782 | } |
12783 | ||
71a38860 | 12784 | // The subexpressions of an array index must be evaluated in order. |
12785 | // If this is indexing into an array, rather than a slice, then only | |
12786 | // the index should be evaluated. Since this is called for values on | |
12787 | // the left hand side of an assigment, evaluating the array, meaning | |
12788 | // copying the array, will cause a different array to be modified. | |
12789 | ||
12790 | bool | |
12791 | Array_index_expression::do_must_eval_subexpressions_in_order( | |
12792 | int* skip) const | |
12793 | { | |
12794 | *skip = this->array_->type()->is_slice_type() ? 0 : 1; | |
12795 | return true; | |
12796 | } | |
12797 | ||
2c809f8f | 12798 | // Flatten array indexing by using temporary variables for slices and indexes. |
35a54f17 | 12799 | |
12800 | Expression* | |
12801 | Array_index_expression::do_flatten(Gogo*, Named_object*, | |
12802 | Statement_inserter* inserter) | |
12803 | { | |
12804 | Location loc = this->location(); | |
5bf8be8b | 12805 | Expression* array = this->array_; |
12806 | Expression* start = this->start_; | |
12807 | Expression* end = this->end_; | |
12808 | Expression* cap = this->cap_; | |
12809 | if (array->is_error_expression() | |
12810 | || array->type()->is_error_type() | |
12811 | || start->is_error_expression() | |
12812 | || start->type()->is_error_type() | |
12813 | || (end != NULL | |
12814 | && (end->is_error_expression() || end->type()->is_error_type())) | |
12815 | || (cap != NULL | |
12816 | && (cap->is_error_expression() || cap->type()->is_error_type()))) | |
12817 | { | |
12818 | go_assert(saw_errors()); | |
12819 | return Expression::make_error(loc); | |
12820 | } | |
12821 | ||
2c809f8f | 12822 | Temporary_statement* temp; |
5bf8be8b | 12823 | if (array->type()->is_slice_type() && !array->is_variable()) |
35a54f17 | 12824 | { |
5bf8be8b | 12825 | temp = Statement::make_temporary(NULL, array, loc); |
35a54f17 | 12826 | inserter->insert(temp); |
12827 | this->array_ = Expression::make_temporary_reference(temp, loc); | |
12828 | } | |
5bf8be8b | 12829 | if (!start->is_variable()) |
2c809f8f | 12830 | { |
5bf8be8b | 12831 | temp = Statement::make_temporary(NULL, start, loc); |
2c809f8f | 12832 | inserter->insert(temp); |
12833 | this->start_ = Expression::make_temporary_reference(temp, loc); | |
12834 | } | |
5bf8be8b | 12835 | if (end != NULL |
12836 | && !end->is_nil_expression() | |
12837 | && !end->is_variable()) | |
2c809f8f | 12838 | { |
5bf8be8b | 12839 | temp = Statement::make_temporary(NULL, end, loc); |
2c809f8f | 12840 | inserter->insert(temp); |
12841 | this->end_ = Expression::make_temporary_reference(temp, loc); | |
12842 | } | |
03118c21 | 12843 | if (cap != NULL && !cap->is_variable()) |
2c809f8f | 12844 | { |
5bf8be8b | 12845 | temp = Statement::make_temporary(NULL, cap, loc); |
2c809f8f | 12846 | inserter->insert(temp); |
12847 | this->cap_ = Expression::make_temporary_reference(temp, loc); | |
12848 | } | |
12849 | ||
35a54f17 | 12850 | return this; |
12851 | } | |
12852 | ||
e440a328 | 12853 | // Return whether this expression is addressable. |
12854 | ||
12855 | bool | |
12856 | Array_index_expression::do_is_addressable() const | |
12857 | { | |
12858 | // A slice expression is not addressable. | |
12859 | if (this->end_ != NULL) | |
12860 | return false; | |
12861 | ||
12862 | // An index into a slice is addressable. | |
411eb89e | 12863 | if (this->array_->type()->is_slice_type()) |
e440a328 | 12864 | return true; |
12865 | ||
12866 | // An index into an array is addressable if the array is | |
12867 | // addressable. | |
12868 | return this->array_->is_addressable(); | |
12869 | } | |
12870 | ||
bf1323be | 12871 | void |
12872 | Array_index_expression::do_address_taken(bool escapes) | |
12873 | { | |
12874 | // In &x[0], if x is a slice, then x's address is not taken. | |
12875 | if (!this->array_->type()->is_slice_type()) | |
12876 | this->array_->address_taken(escapes); | |
12877 | } | |
12878 | ||
ea664253 | 12879 | // Get the backend representation for an array index. |
e440a328 | 12880 | |
ea664253 | 12881 | Bexpression* |
12882 | Array_index_expression::do_get_backend(Translate_context* context) | |
e440a328 | 12883 | { |
e440a328 | 12884 | Array_type* array_type = this->array_->type()->array_type(); |
d8cd8e2d | 12885 | if (array_type == NULL) |
12886 | { | |
c484d925 | 12887 | go_assert(this->array_->type()->is_error()); |
ea664253 | 12888 | return context->backend()->error_expression(); |
d8cd8e2d | 12889 | } |
35a54f17 | 12890 | go_assert(!array_type->is_slice_type() || this->array_->is_variable()); |
e440a328 | 12891 | |
2c809f8f | 12892 | Location loc = this->location(); |
12893 | Gogo* gogo = context->gogo(); | |
12894 | ||
6dfedc16 | 12895 | Type* int_type = Type::lookup_integer_type("int"); |
12896 | Btype* int_btype = int_type->get_backend(gogo); | |
e440a328 | 12897 | |
2c809f8f | 12898 | // We need to convert the length and capacity to the Go "int" type here |
12899 | // because the length of a fixed-length array could be of type "uintptr" | |
12900 | // and gimple disallows binary operations between "uintptr" and other | |
12901 | // integer types. FIXME. | |
12902 | Bexpression* length = NULL; | |
a04bfdfc | 12903 | if (this->end_ == NULL || this->end_->is_nil_expression()) |
12904 | { | |
35a54f17 | 12905 | Expression* len = array_type->get_length(gogo, this->array_); |
ea664253 | 12906 | length = len->get_backend(context); |
2c809f8f | 12907 | length = gogo->backend()->convert_expression(int_btype, length, loc); |
a04bfdfc | 12908 | } |
12909 | ||
2c809f8f | 12910 | Bexpression* capacity = NULL; |
a04bfdfc | 12911 | if (this->end_ != NULL) |
12912 | { | |
35a54f17 | 12913 | Expression* cap = array_type->get_capacity(gogo, this->array_); |
ea664253 | 12914 | capacity = cap->get_backend(context); |
2c809f8f | 12915 | capacity = gogo->backend()->convert_expression(int_btype, capacity, loc); |
a04bfdfc | 12916 | } |
12917 | ||
2c809f8f | 12918 | Bexpression* cap_arg = capacity; |
acf2b673 | 12919 | if (this->cap_ != NULL) |
12920 | { | |
ea664253 | 12921 | cap_arg = this->cap_->get_backend(context); |
2c809f8f | 12922 | cap_arg = gogo->backend()->convert_expression(int_btype, cap_arg, loc); |
acf2b673 | 12923 | } |
12924 | ||
2c809f8f | 12925 | if (length == NULL) |
12926 | length = cap_arg; | |
e440a328 | 12927 | |
6dfedc16 | 12928 | if (this->start_->type()->integer_type() == NULL |
12929 | && !Type::are_convertible(int_type, this->start_->type(), NULL)) | |
12930 | { | |
12931 | go_assert(saw_errors()); | |
12932 | return context->backend()->error_expression(); | |
12933 | } | |
d9f3743a | 12934 | |
ea664253 | 12935 | Bexpression* start = this->start_->get_backend(context); |
2c809f8f | 12936 | start = gogo->backend()->convert_expression(int_btype, start, loc); |
3d135120 | 12937 | |
12938 | Bexpression* crash = NULL; | |
12939 | Bexpression* bad_index = NULL; | |
12940 | if (this->needs_bounds_check_) | |
12941 | { | |
12942 | int code = (array_type->length() != NULL | |
12943 | ? (this->end_ == NULL | |
12944 | ? RUNTIME_ERROR_ARRAY_INDEX_OUT_OF_BOUNDS | |
12945 | : RUNTIME_ERROR_ARRAY_SLICE_OUT_OF_BOUNDS) | |
12946 | : (this->end_ == NULL | |
12947 | ? RUNTIME_ERROR_SLICE_INDEX_OUT_OF_BOUNDS | |
12948 | : RUNTIME_ERROR_SLICE_SLICE_OUT_OF_BOUNDS)); | |
12949 | crash = gogo->runtime_error(code, loc)->get_backend(context); | |
12950 | bad_index = Expression::check_bounds(this->start_, loc)->get_backend(context); | |
12951 | Bexpression* start_too_large = | |
12952 | gogo->backend()->binary_expression((this->end_ == NULL | |
12953 | ? OPERATOR_GE | |
12954 | : OPERATOR_GT), | |
12955 | start, | |
12956 | (this->end_ == NULL | |
12957 | ? length | |
12958 | : capacity), | |
12959 | loc); | |
12960 | bad_index = gogo->backend()->binary_expression(OPERATOR_OROR, | |
12961 | start_too_large, | |
12962 | bad_index, loc); | |
12963 | } | |
12964 | ||
e440a328 | 12965 | |
93715b75 | 12966 | Bfunction* bfn = context->function()->func_value()->get_decl(); |
e440a328 | 12967 | if (this->end_ == NULL) |
12968 | { | |
12969 | // Simple array indexing. This has to return an l-value, so | |
2c809f8f | 12970 | // wrap the index check into START. |
3d135120 | 12971 | if (this->needs_bounds_check_) |
12972 | start = | |
12973 | gogo->backend()->conditional_expression(bfn, int_btype, bad_index, | |
12974 | crash, start, loc); | |
e440a328 | 12975 | |
2c809f8f | 12976 | Bexpression* ret; |
e440a328 | 12977 | if (array_type->length() != NULL) |
12978 | { | |
ea664253 | 12979 | Bexpression* array = this->array_->get_backend(context); |
2c809f8f | 12980 | ret = gogo->backend()->array_index_expression(array, start, loc); |
e440a328 | 12981 | } |
12982 | else | |
12983 | { | |
2c809f8f | 12984 | // Slice. |
12985 | Expression* valptr = | |
44dbe1d7 | 12986 | array_type->get_value_pointer(gogo, this->array_, |
12987 | this->is_lvalue_); | |
ea664253 | 12988 | Bexpression* ptr = valptr->get_backend(context); |
2c809f8f | 12989 | ptr = gogo->backend()->pointer_offset_expression(ptr, start, loc); |
9b27b43c | 12990 | |
12991 | Type* ele_type = this->array_->type()->array_type()->element_type(); | |
12992 | Btype* ele_btype = ele_type->get_backend(gogo); | |
12993 | ret = gogo->backend()->indirect_expression(ele_btype, ptr, true, loc); | |
e440a328 | 12994 | } |
ea664253 | 12995 | return ret; |
e440a328 | 12996 | } |
12997 | ||
12998 | // Array slice. | |
12999 | ||
acf2b673 | 13000 | if (this->cap_ != NULL) |
13001 | { | |
2c809f8f | 13002 | cap_arg = gogo->backend()->convert_expression(int_btype, cap_arg, loc); |
13003 | ||
3d135120 | 13004 | if (this->needs_bounds_check_) |
13005 | { | |
13006 | Bexpression* bounds_bcheck = | |
13007 | Expression::check_bounds(this->cap_, loc)->get_backend(context); | |
13008 | bad_index = | |
13009 | gogo->backend()->binary_expression(OPERATOR_OROR, bounds_bcheck, | |
13010 | bad_index, loc); | |
13011 | ||
13012 | Bexpression* cap_too_small = | |
13013 | gogo->backend()->binary_expression(OPERATOR_LT, cap_arg, start, loc); | |
13014 | Bexpression* cap_too_large = | |
13015 | gogo->backend()->binary_expression(OPERATOR_GT, cap_arg, capacity, loc); | |
13016 | Bexpression* bad_cap = | |
13017 | gogo->backend()->binary_expression(OPERATOR_OROR, cap_too_small, | |
13018 | cap_too_large, loc); | |
13019 | bad_index = gogo->backend()->binary_expression(OPERATOR_OROR, bad_cap, | |
13020 | bad_index, loc); | |
13021 | } | |
2c809f8f | 13022 | } |
13023 | ||
13024 | Bexpression* end; | |
e440a328 | 13025 | if (this->end_->is_nil_expression()) |
2c809f8f | 13026 | end = length; |
e440a328 | 13027 | else |
13028 | { | |
ea664253 | 13029 | end = this->end_->get_backend(context); |
2c809f8f | 13030 | end = gogo->backend()->convert_expression(int_btype, end, loc); |
3d135120 | 13031 | if (this->needs_bounds_check_) |
13032 | { | |
13033 | Bexpression* bounds_bcheck = | |
13034 | Expression::check_bounds(this->end_, loc)->get_backend(context); | |
13035 | bad_index = | |
13036 | gogo->backend()->binary_expression(OPERATOR_OROR, bounds_bcheck, | |
13037 | bad_index, loc); | |
13038 | ||
13039 | Bexpression* end_too_small = | |
13040 | gogo->backend()->binary_expression(OPERATOR_LT, end, start, loc); | |
13041 | Bexpression* end_too_large = | |
13042 | gogo->backend()->binary_expression(OPERATOR_GT, end, cap_arg, loc); | |
13043 | Bexpression* bad_end = | |
13044 | gogo->backend()->binary_expression(OPERATOR_OROR, end_too_small, | |
13045 | end_too_large, loc); | |
13046 | bad_index = gogo->backend()->binary_expression(OPERATOR_OROR, bad_end, | |
13047 | bad_index, loc); | |
13048 | } | |
e440a328 | 13049 | } |
13050 | ||
2c809f8f | 13051 | Bexpression* result_length = |
13052 | gogo->backend()->binary_expression(OPERATOR_MINUS, end, start, loc); | |
e440a328 | 13053 | |
2c809f8f | 13054 | Bexpression* result_capacity = |
13055 | gogo->backend()->binary_expression(OPERATOR_MINUS, cap_arg, start, loc); | |
e440a328 | 13056 | |
03118c21 | 13057 | // If the new capacity is zero, don't change val. Otherwise we can |
13058 | // get a pointer to the next object in memory, keeping it live | |
13059 | // unnecessarily. When the capacity is zero, the actual pointer | |
13060 | // value doesn't matter. | |
13061 | Bexpression* zero = | |
13062 | Expression::make_integer_ul(0, int_type, loc)->get_backend(context); | |
13063 | Bexpression* cond = | |
13064 | gogo->backend()->binary_expression(OPERATOR_EQEQ, result_capacity, zero, | |
13065 | loc); | |
13066 | Bexpression* offset = gogo->backend()->conditional_expression(bfn, int_btype, | |
13067 | cond, zero, | |
13068 | start, loc); | |
44dbe1d7 | 13069 | Expression* valptr = array_type->get_value_pointer(gogo, this->array_, |
13070 | this->is_lvalue_); | |
03118c21 | 13071 | Bexpression* val = valptr->get_backend(context); |
13072 | val = gogo->backend()->pointer_offset_expression(val, offset, loc); | |
13073 | ||
2c809f8f | 13074 | Btype* struct_btype = this->type()->get_backend(gogo); |
13075 | std::vector<Bexpression*> init; | |
13076 | init.push_back(val); | |
13077 | init.push_back(result_length); | |
13078 | init.push_back(result_capacity); | |
e440a328 | 13079 | |
3d135120 | 13080 | Bexpression* ret = |
2c809f8f | 13081 | gogo->backend()->constructor_expression(struct_btype, init, loc); |
3d135120 | 13082 | if (this->needs_bounds_check_) |
13083 | ret = gogo->backend()->conditional_expression(bfn, struct_btype, bad_index, | |
13084 | crash, ret, loc); | |
13085 | return ret; | |
e440a328 | 13086 | } |
13087 | ||
171fd404 | 13088 | // Export an array index expression. |
13089 | ||
13090 | void | |
13091 | Array_index_expression::do_export(Export_function_body* efb) const | |
13092 | { | |
13093 | efb->write_c_string("("); | |
13094 | this->array_->export_expression(efb); | |
13095 | efb->write_c_string(")["); | |
13096 | ||
13097 | Type* old_context = efb->type_context(); | |
13098 | efb->set_type_context(Type::lookup_integer_type("int")); | |
13099 | ||
13100 | this->start_->export_expression(efb); | |
13101 | if (this->end_ == NULL) | |
13102 | go_assert(this->cap_ == NULL); | |
13103 | else | |
13104 | { | |
13105 | efb->write_c_string(":"); | |
13106 | if (!this->end_->is_nil_expression()) | |
13107 | this->end_->export_expression(efb); | |
13108 | if (this->cap_ != NULL) | |
13109 | { | |
13110 | efb->write_c_string(":"); | |
13111 | this->cap_->export_expression(efb); | |
13112 | } | |
13113 | } | |
13114 | ||
13115 | efb->set_type_context(old_context); | |
13116 | ||
13117 | efb->write_c_string("]"); | |
13118 | } | |
13119 | ||
d751bb78 | 13120 | // Dump ast representation for an array index expression. |
13121 | ||
13122 | void | |
f03a9fbf | 13123 | Array_index_expression::do_dump_expression(Ast_dump_context* ast_dump_context) |
d751bb78 | 13124 | const |
13125 | { | |
f03a9fbf | 13126 | Index_expression::dump_index_expression(ast_dump_context, this->array_, |
acf2b673 | 13127 | this->start_, this->end_, this->cap_); |
d751bb78 | 13128 | } |
13129 | ||
acf2b673 | 13130 | // Make an array index expression. END and CAP may be NULL. |
e440a328 | 13131 | |
13132 | Expression* | |
13133 | Expression::make_array_index(Expression* array, Expression* start, | |
acf2b673 | 13134 | Expression* end, Expression* cap, |
13135 | Location location) | |
e440a328 | 13136 | { |
acf2b673 | 13137 | return new Array_index_expression(array, start, end, cap, location); |
e440a328 | 13138 | } |
13139 | ||
50075d74 | 13140 | // Class String_index_expression. |
e440a328 | 13141 | |
13142 | // String index traversal. | |
13143 | ||
13144 | int | |
13145 | String_index_expression::do_traverse(Traverse* traverse) | |
13146 | { | |
13147 | if (Expression::traverse(&this->string_, traverse) == TRAVERSE_EXIT) | |
13148 | return TRAVERSE_EXIT; | |
13149 | if (Expression::traverse(&this->start_, traverse) == TRAVERSE_EXIT) | |
13150 | return TRAVERSE_EXIT; | |
13151 | if (this->end_ != NULL) | |
13152 | { | |
13153 | if (Expression::traverse(&this->end_, traverse) == TRAVERSE_EXIT) | |
13154 | return TRAVERSE_EXIT; | |
13155 | } | |
13156 | return TRAVERSE_CONTINUE; | |
13157 | } | |
13158 | ||
2c809f8f | 13159 | Expression* |
13160 | String_index_expression::do_flatten(Gogo*, Named_object*, | |
13161 | Statement_inserter* inserter) | |
e440a328 | 13162 | { |
2c809f8f | 13163 | Location loc = this->location(); |
5bf8be8b | 13164 | Expression* string = this->string_; |
13165 | Expression* start = this->start_; | |
13166 | Expression* end = this->end_; | |
13167 | if (string->is_error_expression() | |
13168 | || string->type()->is_error_type() | |
13169 | || start->is_error_expression() | |
13170 | || start->type()->is_error_type() | |
13171 | || (end != NULL | |
13172 | && (end->is_error_expression() || end->type()->is_error_type()))) | |
13173 | { | |
13174 | go_assert(saw_errors()); | |
13175 | return Expression::make_error(loc); | |
13176 | } | |
13177 | ||
13178 | Temporary_statement* temp; | |
2c809f8f | 13179 | if (!this->string_->is_variable()) |
13180 | { | |
13181 | temp = Statement::make_temporary(NULL, this->string_, loc); | |
13182 | inserter->insert(temp); | |
13183 | this->string_ = Expression::make_temporary_reference(temp, loc); | |
13184 | } | |
13185 | if (!this->start_->is_variable()) | |
13186 | { | |
13187 | temp = Statement::make_temporary(NULL, this->start_, loc); | |
13188 | inserter->insert(temp); | |
13189 | this->start_ = Expression::make_temporary_reference(temp, loc); | |
13190 | } | |
13191 | if (this->end_ != NULL | |
13192 | && !this->end_->is_nil_expression() | |
13193 | && !this->end_->is_variable()) | |
13194 | { | |
13195 | temp = Statement::make_temporary(NULL, this->end_, loc); | |
13196 | inserter->insert(temp); | |
13197 | this->end_ = Expression::make_temporary_reference(temp, loc); | |
13198 | } | |
13199 | ||
13200 | return this; | |
13201 | } | |
13202 | ||
13203 | // Return the type of a string index. | |
13204 | ||
13205 | Type* | |
13206 | String_index_expression::do_type() | |
13207 | { | |
13208 | if (this->end_ == NULL) | |
13209 | return Type::lookup_integer_type("uint8"); | |
13210 | else | |
13211 | return this->string_->type(); | |
13212 | } | |
13213 | ||
13214 | // Determine the type of a string index. | |
13215 | ||
13216 | void | |
13217 | String_index_expression::do_determine_type(const Type_context*) | |
13218 | { | |
13219 | this->string_->determine_type_no_context(); | |
f77aa642 | 13220 | |
13221 | Type_context index_context(Type::lookup_integer_type("int"), false); | |
13222 | if (this->start_->is_constant()) | |
13223 | this->start_->determine_type(&index_context); | |
13224 | else | |
13225 | this->start_->determine_type_no_context(); | |
e440a328 | 13226 | if (this->end_ != NULL) |
f77aa642 | 13227 | { |
13228 | if (this->end_->is_constant()) | |
13229 | this->end_->determine_type(&index_context); | |
13230 | else | |
13231 | this->end_->determine_type_no_context(); | |
13232 | } | |
e440a328 | 13233 | } |
13234 | ||
13235 | // Check types of a string index. | |
13236 | ||
13237 | void | |
13238 | String_index_expression::do_check_types(Gogo*) | |
13239 | { | |
acdc230d | 13240 | Numeric_constant nc; |
13241 | unsigned long v; | |
13242 | if (this->start_->type()->integer_type() == NULL | |
13243 | && !this->start_->type()->is_error() | |
13244 | && (!this->start_->numeric_constant_value(&nc) | |
13245 | || nc.to_unsigned_long(&v) == Numeric_constant::NC_UL_NOTINT)) | |
e440a328 | 13246 | this->report_error(_("index must be integer")); |
13247 | if (this->end_ != NULL | |
13248 | && this->end_->type()->integer_type() == NULL | |
acdc230d | 13249 | && !this->end_->type()->is_error() |
13250 | && !this->end_->is_nil_expression() | |
13251 | && !this->end_->is_error_expression() | |
13252 | && (!this->end_->numeric_constant_value(&nc) | |
13253 | || nc.to_unsigned_long(&v) == Numeric_constant::NC_UL_NOTINT)) | |
e440a328 | 13254 | this->report_error(_("slice end must be integer")); |
13255 | ||
13256 | std::string sval; | |
13257 | bool sval_valid = this->string_->string_constant_value(&sval); | |
13258 | ||
0c77715b | 13259 | Numeric_constant inc; |
e440a328 | 13260 | mpz_t ival; |
0bd5d859 | 13261 | bool ival_valid = false; |
0c77715b | 13262 | if (this->start_->numeric_constant_value(&inc) && inc.to_int(&ival)) |
e440a328 | 13263 | { |
0bd5d859 | 13264 | ival_valid = true; |
e440a328 | 13265 | if (mpz_sgn(ival) < 0 |
b10f32fb | 13266 | || (sval_valid |
13267 | && (this->end_ == NULL | |
13268 | ? mpz_cmp_ui(ival, sval.length()) >= 0 | |
13269 | : mpz_cmp_ui(ival, sval.length()) > 0))) | |
e440a328 | 13270 | { |
631d5788 | 13271 | go_error_at(this->start_->location(), "string index out of bounds"); |
e440a328 | 13272 | this->set_is_error(); |
13273 | } | |
13274 | } | |
13275 | if (this->end_ != NULL && !this->end_->is_nil_expression()) | |
13276 | { | |
0c77715b | 13277 | Numeric_constant enc; |
13278 | mpz_t eval; | |
13279 | if (this->end_->numeric_constant_value(&enc) && enc.to_int(&eval)) | |
e440a328 | 13280 | { |
0c77715b | 13281 | if (mpz_sgn(eval) < 0 |
13282 | || (sval_valid && mpz_cmp_ui(eval, sval.length()) > 0)) | |
e440a328 | 13283 | { |
631d5788 | 13284 | go_error_at(this->end_->location(), "string index out of bounds"); |
e440a328 | 13285 | this->set_is_error(); |
13286 | } | |
0bd5d859 | 13287 | else if (ival_valid && mpz_cmp(ival, eval) > 0) |
13288 | this->report_error(_("inverted slice range")); | |
0c77715b | 13289 | mpz_clear(eval); |
e440a328 | 13290 | } |
13291 | } | |
0bd5d859 | 13292 | if (ival_valid) |
13293 | mpz_clear(ival); | |
e440a328 | 13294 | } |
13295 | ||
ea664253 | 13296 | // Get the backend representation for a string index. |
e440a328 | 13297 | |
ea664253 | 13298 | Bexpression* |
13299 | String_index_expression::do_get_backend(Translate_context* context) | |
e440a328 | 13300 | { |
b13c66cd | 13301 | Location loc = this->location(); |
2c809f8f | 13302 | Expression* bad_index = Expression::check_bounds(this->start_, loc); |
e440a328 | 13303 | |
2c809f8f | 13304 | int code = (this->end_ == NULL |
13305 | ? RUNTIME_ERROR_STRING_INDEX_OUT_OF_BOUNDS | |
13306 | : RUNTIME_ERROR_STRING_SLICE_OUT_OF_BOUNDS); | |
e440a328 | 13307 | |
2c809f8f | 13308 | Gogo* gogo = context->gogo(); |
ea664253 | 13309 | Bexpression* crash = gogo->runtime_error(code, loc)->get_backend(context); |
1b1f2abf | 13310 | |
13311 | Type* int_type = Type::lookup_integer_type("int"); | |
e440a328 | 13312 | |
2c809f8f | 13313 | // It is possible that an error occurred earlier because the start index |
13314 | // cannot be represented as an integer type. In this case, we shouldn't | |
13315 | // try casting the starting index into an integer since | |
13316 | // Type_conversion_expression will fail to get the backend representation. | |
13317 | // FIXME. | |
13318 | if (this->start_->type()->integer_type() == NULL | |
13319 | && !Type::are_convertible(int_type, this->start_->type(), NULL)) | |
13320 | { | |
13321 | go_assert(saw_errors()); | |
ea664253 | 13322 | return context->backend()->error_expression(); |
2c809f8f | 13323 | } |
e440a328 | 13324 | |
28bc9435 | 13325 | go_assert(this->string_->is_variable()); |
13326 | go_assert(this->start_->is_variable()); | |
13327 | ||
2c809f8f | 13328 | Expression* start = Expression::make_cast(int_type, this->start_, loc); |
93715b75 | 13329 | Bfunction* bfn = context->function()->func_value()->get_decl(); |
e440a328 | 13330 | |
28bc9435 | 13331 | Expression* length = |
13332 | Expression::make_string_info(this->string_, STRING_INFO_LENGTH, loc); | |
13333 | Expression* bytes = | |
13334 | Expression::make_string_info(this->string_, STRING_INFO_DATA, loc); | |
13335 | ||
13336 | Bexpression* bstart = start->get_backend(context); | |
13337 | Bexpression* ptr = bytes->get_backend(context); | |
13338 | ||
2c809f8f | 13339 | if (this->end_ == NULL) |
13340 | { | |
2c809f8f | 13341 | Expression* start_too_large = |
13342 | Expression::make_binary(OPERATOR_GE, start, length, loc); | |
13343 | bad_index = Expression::make_binary(OPERATOR_OROR, start_too_large, | |
13344 | bad_index, loc); | |
e440a328 | 13345 | |
2c809f8f | 13346 | ptr = gogo->backend()->pointer_offset_expression(ptr, bstart, loc); |
9b27b43c | 13347 | Btype* ubtype = Type::lookup_integer_type("uint8")->get_backend(gogo); |
f03a9fbf | 13348 | Bexpression* index = |
9b27b43c | 13349 | gogo->backend()->indirect_expression(ubtype, ptr, true, loc); |
e440a328 | 13350 | |
2c809f8f | 13351 | Btype* byte_btype = bytes->type()->points_to()->get_backend(gogo); |
ea664253 | 13352 | Bexpression* index_error = bad_index->get_backend(context); |
93715b75 | 13353 | return gogo->backend()->conditional_expression(bfn, byte_btype, |
13354 | index_error, crash, | |
13355 | index, loc); | |
2c809f8f | 13356 | } |
13357 | ||
13358 | Expression* end = NULL; | |
13359 | if (this->end_->is_nil_expression()) | |
28bc9435 | 13360 | end = length; |
e440a328 | 13361 | else |
13362 | { | |
28bc9435 | 13363 | go_assert(this->end_->is_variable()); |
2c809f8f | 13364 | Expression* bounds_check = Expression::check_bounds(this->end_, loc); |
13365 | bad_index = | |
13366 | Expression::make_binary(OPERATOR_OROR, bounds_check, bad_index, loc); | |
13367 | end = Expression::make_cast(int_type, this->end_, loc); | |
28bc9435 | 13368 | |
13369 | Expression* end_too_large = | |
13370 | Expression::make_binary(OPERATOR_GT, end, length, loc); | |
13371 | bad_index = Expression::make_binary(OPERATOR_OROR, end_too_large, | |
13372 | bad_index, loc); | |
e440a328 | 13373 | } |
28bc9435 | 13374 | Expression* start_too_large = |
13375 | Expression::make_binary(OPERATOR_GT, start->copy(), end->copy(), loc); | |
13376 | bad_index = Expression::make_binary(OPERATOR_OROR, start_too_large, | |
13377 | bad_index, loc); | |
13378 | ||
13379 | end = end->copy(); | |
13380 | Bexpression* bend = end->get_backend(context); | |
13381 | Bexpression* new_length = | |
13382 | gogo->backend()->binary_expression(OPERATOR_MINUS, bend, bstart, loc); | |
2c809f8f | 13383 | |
28bc9435 | 13384 | // If the new length is zero, don't change pointer. Otherwise we can |
13385 | // get a pointer to the next object in memory, keeping it live | |
13386 | // unnecessarily. When the length is zero, the actual pointer | |
13387 | // value doesn't matter. | |
13388 | Btype* int_btype = int_type->get_backend(gogo); | |
13389 | Bexpression* zero = | |
13390 | Expression::make_integer_ul(0, int_type, loc)->get_backend(context); | |
13391 | Bexpression* cond = | |
13392 | gogo->backend()->binary_expression(OPERATOR_EQEQ, new_length, zero, | |
13393 | loc); | |
13394 | Bexpression* offset = | |
13395 | gogo->backend()->conditional_expression(bfn, int_btype, cond, zero, | |
13396 | bstart, loc); | |
13397 | ||
13398 | ptr = gogo->backend()->pointer_offset_expression(ptr, offset, loc); | |
13399 | ||
13400 | Btype* str_btype = this->type()->get_backend(gogo); | |
13401 | std::vector<Bexpression*> init; | |
13402 | init.push_back(ptr); | |
13403 | init.push_back(new_length); | |
13404 | Bexpression* bstrslice = | |
13405 | gogo->backend()->constructor_expression(str_btype, init, loc); | |
2c809f8f | 13406 | |
ea664253 | 13407 | Bexpression* index_error = bad_index->get_backend(context); |
93715b75 | 13408 | return gogo->backend()->conditional_expression(bfn, str_btype, index_error, |
ea664253 | 13409 | crash, bstrslice, loc); |
e440a328 | 13410 | } |
13411 | ||
171fd404 | 13412 | // Export a string index expression. |
13413 | ||
13414 | void | |
13415 | String_index_expression::do_export(Export_function_body* efb) const | |
13416 | { | |
13417 | efb->write_c_string("("); | |
13418 | this->string_->export_expression(efb); | |
13419 | efb->write_c_string(")["); | |
13420 | ||
13421 | Type* old_context = efb->type_context(); | |
13422 | efb->set_type_context(Type::lookup_integer_type("int")); | |
13423 | ||
13424 | this->start_->export_expression(efb); | |
13425 | if (this->end_ != NULL) | |
13426 | { | |
13427 | efb->write_c_string(":"); | |
13428 | if (!this->end_->is_nil_expression()) | |
13429 | this->end_->export_expression(efb); | |
13430 | } | |
13431 | ||
13432 | efb->set_type_context(old_context); | |
13433 | ||
13434 | efb->write_c_string("]"); | |
13435 | } | |
13436 | ||
d751bb78 | 13437 | // Dump ast representation for a string index expression. |
13438 | ||
13439 | void | |
13440 | String_index_expression::do_dump_expression(Ast_dump_context* ast_dump_context) | |
13441 | const | |
13442 | { | |
acf2b673 | 13443 | Index_expression::dump_index_expression(ast_dump_context, this->string_, |
13444 | this->start_, this->end_, NULL); | |
d751bb78 | 13445 | } |
13446 | ||
e440a328 | 13447 | // Make a string index expression. END may be NULL. |
13448 | ||
13449 | Expression* | |
13450 | Expression::make_string_index(Expression* string, Expression* start, | |
b13c66cd | 13451 | Expression* end, Location location) |
e440a328 | 13452 | { |
13453 | return new String_index_expression(string, start, end, location); | |
13454 | } | |
13455 | ||
13456 | // Class Map_index. | |
13457 | ||
13458 | // Get the type of the map. | |
13459 | ||
13460 | Map_type* | |
13461 | Map_index_expression::get_map_type() const | |
13462 | { | |
0d5530d9 | 13463 | Map_type* mt = this->map_->type()->map_type(); |
c7524fae | 13464 | if (mt == NULL) |
c484d925 | 13465 | go_assert(saw_errors()); |
e440a328 | 13466 | return mt; |
13467 | } | |
13468 | ||
13469 | // Map index traversal. | |
13470 | ||
13471 | int | |
13472 | Map_index_expression::do_traverse(Traverse* traverse) | |
13473 | { | |
13474 | if (Expression::traverse(&this->map_, traverse) == TRAVERSE_EXIT) | |
13475 | return TRAVERSE_EXIT; | |
13476 | return Expression::traverse(&this->index_, traverse); | |
13477 | } | |
13478 | ||
2c809f8f | 13479 | // We need to pass in a pointer to the key, so flatten the index into a |
13480 | // temporary variable if it isn't already. The value pointer will be | |
13481 | // dereferenced and checked for nil, so flatten into a temporary to avoid | |
13482 | // recomputation. | |
13483 | ||
13484 | Expression* | |
91c0fd76 | 13485 | Map_index_expression::do_flatten(Gogo* gogo, Named_object*, |
2c809f8f | 13486 | Statement_inserter* inserter) |
13487 | { | |
91c0fd76 | 13488 | Location loc = this->location(); |
2c809f8f | 13489 | Map_type* mt = this->get_map_type(); |
5bf8be8b | 13490 | if (this->index()->is_error_expression() |
13491 | || this->index()->type()->is_error_type() | |
13492 | || mt->is_error_type()) | |
13493 | { | |
13494 | go_assert(saw_errors()); | |
13495 | return Expression::make_error(loc); | |
13496 | } | |
13497 | ||
e2b25cf3 | 13498 | // Avoid copy for string([]byte) conversions used in map keys. |
13499 | // mapaccess doesn't keep the reference, so this is safe. | |
13500 | Type_conversion_expression* ce = this->index_->conversion_expression(); | |
13501 | if (ce != NULL && ce->type()->is_string_type() | |
13502 | && ce->expr()->type()->is_slice_type()) | |
13503 | ce->set_no_copy(true); | |
13504 | ||
3a522dcc | 13505 | if (!Type::are_identical(mt->key_type(), this->index_->type(), |
13506 | Type::COMPARE_ERRORS | Type::COMPARE_TAGS, | |
13507 | NULL)) | |
91c0fd76 | 13508 | { |
13509 | if (this->index_->type()->interface_type() != NULL | |
13510 | && !this->index_->is_variable()) | |
13511 | { | |
13512 | Temporary_statement* temp = | |
13513 | Statement::make_temporary(NULL, this->index_, loc); | |
13514 | inserter->insert(temp); | |
13515 | this->index_ = Expression::make_temporary_reference(temp, loc); | |
13516 | } | |
13517 | this->index_ = Expression::convert_for_assignment(gogo, mt->key_type(), | |
13518 | this->index_, loc); | |
13519 | } | |
2c809f8f | 13520 | |
13521 | if (!this->index_->is_variable()) | |
13522 | { | |
13523 | Temporary_statement* temp = Statement::make_temporary(NULL, this->index_, | |
91c0fd76 | 13524 | loc); |
2c809f8f | 13525 | inserter->insert(temp); |
91c0fd76 | 13526 | this->index_ = Expression::make_temporary_reference(temp, loc); |
2c809f8f | 13527 | } |
13528 | ||
13529 | if (this->value_pointer_ == NULL) | |
0d5530d9 | 13530 | this->get_value_pointer(gogo); |
5bf8be8b | 13531 | if (this->value_pointer_->is_error_expression() |
13532 | || this->value_pointer_->type()->is_error_type()) | |
13533 | return Expression::make_error(loc); | |
2c809f8f | 13534 | if (!this->value_pointer_->is_variable()) |
13535 | { | |
13536 | Temporary_statement* temp = | |
91c0fd76 | 13537 | Statement::make_temporary(NULL, this->value_pointer_, loc); |
2c809f8f | 13538 | inserter->insert(temp); |
91c0fd76 | 13539 | this->value_pointer_ = Expression::make_temporary_reference(temp, loc); |
2c809f8f | 13540 | } |
13541 | ||
13542 | return this; | |
13543 | } | |
13544 | ||
e440a328 | 13545 | // Return the type of a map index. |
13546 | ||
13547 | Type* | |
13548 | Map_index_expression::do_type() | |
13549 | { | |
c7524fae | 13550 | Map_type* mt = this->get_map_type(); |
13551 | if (mt == NULL) | |
13552 | return Type::make_error_type(); | |
0d5530d9 | 13553 | return mt->val_type(); |
e440a328 | 13554 | } |
13555 | ||
13556 | // Fix the type of a map index. | |
13557 | ||
13558 | void | |
13559 | Map_index_expression::do_determine_type(const Type_context*) | |
13560 | { | |
13561 | this->map_->determine_type_no_context(); | |
c7524fae | 13562 | Map_type* mt = this->get_map_type(); |
13563 | Type* key_type = mt == NULL ? NULL : mt->key_type(); | |
13564 | Type_context subcontext(key_type, false); | |
e440a328 | 13565 | this->index_->determine_type(&subcontext); |
13566 | } | |
13567 | ||
13568 | // Check types of a map index. | |
13569 | ||
13570 | void | |
13571 | Map_index_expression::do_check_types(Gogo*) | |
13572 | { | |
13573 | std::string reason; | |
c7524fae | 13574 | Map_type* mt = this->get_map_type(); |
13575 | if (mt == NULL) | |
13576 | return; | |
13577 | if (!Type::are_assignable(mt->key_type(), this->index_->type(), &reason)) | |
e440a328 | 13578 | { |
13579 | if (reason.empty()) | |
13580 | this->report_error(_("incompatible type for map index")); | |
13581 | else | |
13582 | { | |
631d5788 | 13583 | go_error_at(this->location(), "incompatible type for map index (%s)", |
13584 | reason.c_str()); | |
e440a328 | 13585 | this->set_is_error(); |
13586 | } | |
13587 | } | |
13588 | } | |
13589 | ||
e007b1eb | 13590 | // Add explicit type conversions. |
13591 | ||
13592 | void | |
13593 | Map_index_expression::do_add_conversions() | |
13594 | { | |
13595 | Map_type* mt = this->get_map_type(); | |
13596 | if (mt == NULL) | |
13597 | return; | |
13598 | Type* lt = mt->key_type(); | |
13599 | Type* rt = this->index_->type(); | |
13600 | if (!Type::are_identical(lt, rt, 0, NULL) | |
13601 | && lt->interface_type() != NULL) | |
13602 | this->index_ = Expression::make_cast(lt, this->index_, this->location()); | |
13603 | } | |
13604 | ||
ea664253 | 13605 | // Get the backend representation for a map index. |
e440a328 | 13606 | |
ea664253 | 13607 | Bexpression* |
13608 | Map_index_expression::do_get_backend(Translate_context* context) | |
e440a328 | 13609 | { |
13610 | Map_type* type = this->get_map_type(); | |
c7524fae | 13611 | if (type == NULL) |
2c809f8f | 13612 | { |
13613 | go_assert(saw_errors()); | |
ea664253 | 13614 | return context->backend()->error_expression(); |
2c809f8f | 13615 | } |
e440a328 | 13616 | |
2c809f8f | 13617 | go_assert(this->value_pointer_ != NULL |
13618 | && this->value_pointer_->is_variable()); | |
e440a328 | 13619 | |
f614ea8b | 13620 | Expression* val = Expression::make_dereference(this->value_pointer_, |
13621 | NIL_CHECK_NOT_NEEDED, | |
13622 | this->location()); | |
0d5530d9 | 13623 | return val->get_backend(context); |
e440a328 | 13624 | } |
13625 | ||
0d5530d9 | 13626 | // Get an expression for the map index. This returns an expression |
13627 | // that evaluates to a pointer to a value. If the key is not in the | |
13628 | // map, the pointer will point to a zero value. | |
e440a328 | 13629 | |
2c809f8f | 13630 | Expression* |
0d5530d9 | 13631 | Map_index_expression::get_value_pointer(Gogo* gogo) |
e440a328 | 13632 | { |
2c809f8f | 13633 | if (this->value_pointer_ == NULL) |
746d2e73 | 13634 | { |
2c809f8f | 13635 | Map_type* type = this->get_map_type(); |
13636 | if (type == NULL) | |
746d2e73 | 13637 | { |
2c809f8f | 13638 | go_assert(saw_errors()); |
13639 | return Expression::make_error(this->location()); | |
746d2e73 | 13640 | } |
e440a328 | 13641 | |
2c809f8f | 13642 | Location loc = this->location(); |
13643 | Expression* map_ref = this->map_; | |
e440a328 | 13644 | |
0d5530d9 | 13645 | Expression* index_ptr = Expression::make_unary(OPERATOR_AND, |
13646 | this->index_, | |
2c809f8f | 13647 | loc); |
0d5530d9 | 13648 | |
26329c24 | 13649 | Expression* type_expr = Expression::make_type_descriptor(type, loc); |
0d5530d9 | 13650 | Expression* zero = type->fat_zero_value(gogo); |
0d5530d9 | 13651 | Expression* map_index; |
0d5530d9 | 13652 | if (zero == NULL) |
26329c24 | 13653 | { |
13654 | Runtime::Function code; | |
13655 | Expression* key; | |
13656 | switch (type->algorithm(gogo)) | |
13657 | { | |
13658 | case Map_type::MAP_ALG_FAST32: | |
13659 | case Map_type::MAP_ALG_FAST32PTR: | |
13660 | { | |
13661 | Type* uint32_type = Type::lookup_integer_type("uint32"); | |
13662 | Type* uint32_ptr_type = Type::make_pointer_type(uint32_type); | |
13663 | key = Expression::make_unsafe_cast(uint32_ptr_type, index_ptr, | |
13664 | loc); | |
13665 | key = Expression::make_dereference(key, NIL_CHECK_NOT_NEEDED, | |
13666 | loc); | |
13667 | code = Runtime::MAPACCESS1_FAST32; | |
13668 | break; | |
13669 | } | |
13670 | case Map_type::MAP_ALG_FAST64: | |
13671 | case Map_type::MAP_ALG_FAST64PTR: | |
13672 | { | |
13673 | Type* uint64_type = Type::lookup_integer_type("uint64"); | |
13674 | Type* uint64_ptr_type = Type::make_pointer_type(uint64_type); | |
13675 | key = Expression::make_unsafe_cast(uint64_ptr_type, index_ptr, | |
13676 | loc); | |
13677 | key = Expression::make_dereference(key, NIL_CHECK_NOT_NEEDED, | |
13678 | loc); | |
13679 | code = Runtime::MAPACCESS1_FAST64; | |
13680 | break; | |
13681 | } | |
13682 | case Map_type::MAP_ALG_FASTSTR: | |
13683 | key = this->index_; | |
13684 | code = Runtime::MAPACCESS1_FASTSTR; | |
13685 | break; | |
13686 | default: | |
13687 | key = index_ptr; | |
13688 | code = Runtime::MAPACCESS1; | |
13689 | break; | |
13690 | } | |
13691 | map_index = Runtime::make_call(code, loc, 3, | |
13692 | type_expr, map_ref, key); | |
13693 | } | |
0d5530d9 | 13694 | else |
26329c24 | 13695 | map_index = Runtime::make_call(Runtime::MAPACCESS1_FAT, loc, 4, |
13696 | type_expr, map_ref, index_ptr, zero); | |
2c809f8f | 13697 | |
13698 | Type* val_type = type->val_type(); | |
13699 | this->value_pointer_ = | |
13700 | Expression::make_unsafe_cast(Type::make_pointer_type(val_type), | |
13701 | map_index, this->location()); | |
13702 | } | |
0d5530d9 | 13703 | |
2c809f8f | 13704 | return this->value_pointer_; |
e440a328 | 13705 | } |
13706 | ||
171fd404 | 13707 | // Export a map index expression. |
13708 | ||
13709 | void | |
13710 | Map_index_expression::do_export(Export_function_body* efb) const | |
13711 | { | |
13712 | efb->write_c_string("("); | |
13713 | this->map_->export_expression(efb); | |
13714 | efb->write_c_string(")["); | |
13715 | ||
13716 | Type* old_context = efb->type_context(); | |
13717 | efb->set_type_context(this->get_map_type()->key_type()); | |
13718 | ||
13719 | this->index_->export_expression(efb); | |
13720 | ||
13721 | efb->set_type_context(old_context); | |
13722 | ||
13723 | efb->write_c_string("]"); | |
13724 | } | |
13725 | ||
d751bb78 | 13726 | // Dump ast representation for a map index expression |
13727 | ||
13728 | void | |
f03a9fbf | 13729 | Map_index_expression::do_dump_expression(Ast_dump_context* ast_dump_context) |
d751bb78 | 13730 | const |
13731 | { | |
acf2b673 | 13732 | Index_expression::dump_index_expression(ast_dump_context, this->map_, |
13733 | this->index_, NULL, NULL); | |
d751bb78 | 13734 | } |
13735 | ||
e440a328 | 13736 | // Make a map index expression. |
13737 | ||
13738 | Map_index_expression* | |
13739 | Expression::make_map_index(Expression* map, Expression* index, | |
b13c66cd | 13740 | Location location) |
e440a328 | 13741 | { |
13742 | return new Map_index_expression(map, index, location); | |
13743 | } | |
13744 | ||
13745 | // Class Field_reference_expression. | |
13746 | ||
149eabc5 | 13747 | // Lower a field reference expression. There is nothing to lower, but |
13748 | // this is where we generate the tracking information for fields with | |
13749 | // the magic go:"track" tag. | |
13750 | ||
13751 | Expression* | |
13752 | Field_reference_expression::do_lower(Gogo* gogo, Named_object* function, | |
13753 | Statement_inserter* inserter, int) | |
13754 | { | |
13755 | Struct_type* struct_type = this->expr_->type()->struct_type(); | |
13756 | if (struct_type == NULL) | |
13757 | { | |
13758 | // Error will be reported elsewhere. | |
13759 | return this; | |
13760 | } | |
13761 | const Struct_field* field = struct_type->field(this->field_index_); | |
13762 | if (field == NULL) | |
13763 | return this; | |
13764 | if (!field->has_tag()) | |
13765 | return this; | |
13766 | if (field->tag().find("go:\"track\"") == std::string::npos) | |
13767 | return this; | |
13768 | ||
604e278d | 13769 | // References from functions generated by the compiler don't count. |
c6292d1d | 13770 | if (function != NULL && function->func_value()->is_type_specific_function()) |
604e278d | 13771 | return this; |
13772 | ||
149eabc5 | 13773 | // We have found a reference to a tracked field. Build a call to |
13774 | // the runtime function __go_fieldtrack with a string that describes | |
13775 | // the field. FIXME: We should only call this once per referenced | |
13776 | // field per function, not once for each reference to the field. | |
13777 | ||
13778 | if (this->called_fieldtrack_) | |
13779 | return this; | |
13780 | this->called_fieldtrack_ = true; | |
13781 | ||
13782 | Location loc = this->location(); | |
13783 | ||
13784 | std::string s = "fieldtrack \""; | |
e65055a5 | 13785 | Named_type* nt = this->expr_->type()->unalias()->named_type(); |
149eabc5 | 13786 | if (nt == NULL || nt->named_object()->package() == NULL) |
13787 | s.append(gogo->pkgpath()); | |
13788 | else | |
13789 | s.append(nt->named_object()->package()->pkgpath()); | |
13790 | s.push_back('.'); | |
13791 | if (nt != NULL) | |
5c29ad36 | 13792 | s.append(Gogo::unpack_hidden_name(nt->name())); |
149eabc5 | 13793 | s.push_back('.'); |
13794 | s.append(field->field_name()); | |
13795 | s.push_back('"'); | |
13796 | ||
13797 | // We can't use a string here, because internally a string holds a | |
13798 | // pointer to the actual bytes; when the linker garbage collects the | |
13799 | // string, it won't garbage collect the bytes. So we use a | |
13800 | // [...]byte. | |
13801 | ||
e67508fa | 13802 | Expression* length_expr = Expression::make_integer_ul(s.length(), NULL, loc); |
149eabc5 | 13803 | |
13804 | Type* byte_type = gogo->lookup_global("byte")->type_value(); | |
6bf4793c | 13805 | Array_type* array_type = Type::make_array_type(byte_type, length_expr); |
13806 | array_type->set_is_array_incomparable(); | |
149eabc5 | 13807 | |
13808 | Expression_list* bytes = new Expression_list(); | |
13809 | for (std::string::const_iterator p = s.begin(); p != s.end(); p++) | |
13810 | { | |
e67508fa | 13811 | unsigned char c = static_cast<unsigned char>(*p); |
13812 | bytes->push_back(Expression::make_integer_ul(c, NULL, loc)); | |
149eabc5 | 13813 | } |
13814 | ||
13815 | Expression* e = Expression::make_composite_literal(array_type, 0, false, | |
62750cd5 | 13816 | bytes, false, loc); |
149eabc5 | 13817 | |
13818 | Variable* var = new Variable(array_type, e, true, false, false, loc); | |
13819 | ||
13820 | static int count; | |
13821 | char buf[50]; | |
13822 | snprintf(buf, sizeof buf, "fieldtrack.%d", count); | |
13823 | ++count; | |
13824 | ||
13825 | Named_object* no = gogo->add_variable(buf, var); | |
13826 | e = Expression::make_var_reference(no, loc); | |
13827 | e = Expression::make_unary(OPERATOR_AND, e, loc); | |
13828 | ||
13829 | Expression* call = Runtime::make_call(Runtime::FIELDTRACK, loc, 1, e); | |
604e278d | 13830 | gogo->lower_expression(function, inserter, &call); |
149eabc5 | 13831 | inserter->insert(Statement::make_statement(call, false)); |
13832 | ||
13833 | // Put this function, and the global variable we just created, into | |
13834 | // unique sections. This will permit the linker to garbage collect | |
13835 | // them if they are not referenced. The effect is that the only | |
13836 | // strings, indicating field references, that will wind up in the | |
13837 | // executable will be those for functions that are actually needed. | |
66a6be58 | 13838 | if (function != NULL) |
13839 | function->func_value()->set_in_unique_section(); | |
149eabc5 | 13840 | var->set_in_unique_section(); |
13841 | ||
13842 | return this; | |
13843 | } | |
13844 | ||
e440a328 | 13845 | // Return the type of a field reference. |
13846 | ||
13847 | Type* | |
13848 | Field_reference_expression::do_type() | |
13849 | { | |
b0e628fb | 13850 | Type* type = this->expr_->type(); |
5c13bd80 | 13851 | if (type->is_error()) |
b0e628fb | 13852 | return type; |
13853 | Struct_type* struct_type = type->struct_type(); | |
c484d925 | 13854 | go_assert(struct_type != NULL); |
e440a328 | 13855 | return struct_type->field(this->field_index_)->type(); |
13856 | } | |
13857 | ||
13858 | // Check the types for a field reference. | |
13859 | ||
13860 | void | |
13861 | Field_reference_expression::do_check_types(Gogo*) | |
13862 | { | |
b0e628fb | 13863 | Type* type = this->expr_->type(); |
5c13bd80 | 13864 | if (type->is_error()) |
b0e628fb | 13865 | return; |
13866 | Struct_type* struct_type = type->struct_type(); | |
c484d925 | 13867 | go_assert(struct_type != NULL); |
13868 | go_assert(struct_type->field(this->field_index_) != NULL); | |
e440a328 | 13869 | } |
13870 | ||
ea664253 | 13871 | // Get the backend representation for a field reference. |
e440a328 | 13872 | |
ea664253 | 13873 | Bexpression* |
13874 | Field_reference_expression::do_get_backend(Translate_context* context) | |
e440a328 | 13875 | { |
ea664253 | 13876 | Bexpression* bstruct = this->expr_->get_backend(context); |
13877 | return context->gogo()->backend()->struct_field_expression(bstruct, | |
13878 | this->field_index_, | |
13879 | this->location()); | |
e440a328 | 13880 | } |
13881 | ||
d751bb78 | 13882 | // Dump ast representation for a field reference expression. |
13883 | ||
13884 | void | |
13885 | Field_reference_expression::do_dump_expression( | |
13886 | Ast_dump_context* ast_dump_context) const | |
13887 | { | |
13888 | this->expr_->dump_expression(ast_dump_context); | |
13889 | ast_dump_context->ostream() << "." << this->field_index_; | |
13890 | } | |
13891 | ||
e440a328 | 13892 | // Make a reference to a qualified identifier in an expression. |
13893 | ||
13894 | Field_reference_expression* | |
13895 | Expression::make_field_reference(Expression* expr, unsigned int field_index, | |
b13c66cd | 13896 | Location location) |
e440a328 | 13897 | { |
13898 | return new Field_reference_expression(expr, field_index, location); | |
13899 | } | |
13900 | ||
13901 | // Class Interface_field_reference_expression. | |
13902 | ||
2387f644 | 13903 | // Return an expression for the pointer to the function to call. |
e440a328 | 13904 | |
2387f644 | 13905 | Expression* |
13906 | Interface_field_reference_expression::get_function() | |
e440a328 | 13907 | { |
2387f644 | 13908 | Expression* ref = this->expr_; |
13909 | Location loc = this->location(); | |
13910 | if (ref->type()->points_to() != NULL) | |
f614ea8b | 13911 | ref = Expression::make_dereference(ref, NIL_CHECK_DEFAULT, loc); |
e440a328 | 13912 | |
2387f644 | 13913 | Expression* mtable = |
13914 | Expression::make_interface_info(ref, INTERFACE_INFO_METHODS, loc); | |
13915 | Struct_type* mtable_type = mtable->type()->points_to()->struct_type(); | |
e440a328 | 13916 | |
13917 | std::string name = Gogo::unpack_hidden_name(this->name_); | |
2387f644 | 13918 | unsigned int index; |
13919 | const Struct_field* field = mtable_type->find_local_field(name, &index); | |
13920 | go_assert(field != NULL); | |
f614ea8b | 13921 | |
13922 | mtable = Expression::make_dereference(mtable, NIL_CHECK_NOT_NEEDED, loc); | |
2387f644 | 13923 | return Expression::make_field_reference(mtable, index, loc); |
e440a328 | 13924 | } |
13925 | ||
2387f644 | 13926 | // Return an expression for the first argument to pass to the interface |
e440a328 | 13927 | // function. |
13928 | ||
2387f644 | 13929 | Expression* |
13930 | Interface_field_reference_expression::get_underlying_object() | |
e440a328 | 13931 | { |
2387f644 | 13932 | Expression* expr = this->expr_; |
13933 | if (expr->type()->points_to() != NULL) | |
f614ea8b | 13934 | expr = Expression::make_dereference(expr, NIL_CHECK_DEFAULT, |
13935 | this->location()); | |
2387f644 | 13936 | return Expression::make_interface_info(expr, INTERFACE_INFO_OBJECT, |
13937 | this->location()); | |
e440a328 | 13938 | } |
13939 | ||
13940 | // Traversal. | |
13941 | ||
13942 | int | |
13943 | Interface_field_reference_expression::do_traverse(Traverse* traverse) | |
13944 | { | |
13945 | return Expression::traverse(&this->expr_, traverse); | |
13946 | } | |
13947 | ||
0afbb937 | 13948 | // Lower the expression. If this expression is not called, we need to |
13949 | // evaluate the expression twice when converting to the backend | |
13950 | // interface. So introduce a temporary variable if necessary. | |
13951 | ||
13952 | Expression* | |
9782d556 | 13953 | Interface_field_reference_expression::do_flatten(Gogo*, Named_object*, |
13954 | Statement_inserter* inserter) | |
0afbb937 | 13955 | { |
5bf8be8b | 13956 | if (this->expr_->is_error_expression() |
13957 | || this->expr_->type()->is_error_type()) | |
13958 | { | |
13959 | go_assert(saw_errors()); | |
13960 | return Expression::make_error(this->location()); | |
13961 | } | |
13962 | ||
2387f644 | 13963 | if (!this->expr_->is_variable()) |
0afbb937 | 13964 | { |
13965 | Temporary_statement* temp = | |
9189e53b | 13966 | Statement::make_temporary(NULL, this->expr_, this->location()); |
0afbb937 | 13967 | inserter->insert(temp); |
9189e53b | 13968 | this->expr_ = Expression::make_temporary_reference(temp, this->location()); |
0afbb937 | 13969 | } |
13970 | return this; | |
13971 | } | |
13972 | ||
e440a328 | 13973 | // Return the type of an interface field reference. |
13974 | ||
13975 | Type* | |
13976 | Interface_field_reference_expression::do_type() | |
13977 | { | |
13978 | Type* expr_type = this->expr_->type(); | |
13979 | ||
13980 | Type* points_to = expr_type->points_to(); | |
13981 | if (points_to != NULL) | |
13982 | expr_type = points_to; | |
13983 | ||
13984 | Interface_type* interface_type = expr_type->interface_type(); | |
13985 | if (interface_type == NULL) | |
13986 | return Type::make_error_type(); | |
13987 | ||
13988 | const Typed_identifier* method = interface_type->find_method(this->name_); | |
13989 | if (method == NULL) | |
13990 | return Type::make_error_type(); | |
13991 | ||
13992 | return method->type(); | |
13993 | } | |
13994 | ||
13995 | // Determine types. | |
13996 | ||
13997 | void | |
13998 | Interface_field_reference_expression::do_determine_type(const Type_context*) | |
13999 | { | |
14000 | this->expr_->determine_type_no_context(); | |
14001 | } | |
14002 | ||
14003 | // Check the types for an interface field reference. | |
14004 | ||
14005 | void | |
14006 | Interface_field_reference_expression::do_check_types(Gogo*) | |
14007 | { | |
14008 | Type* type = this->expr_->type(); | |
14009 | ||
14010 | Type* points_to = type->points_to(); | |
14011 | if (points_to != NULL) | |
14012 | type = points_to; | |
14013 | ||
14014 | Interface_type* interface_type = type->interface_type(); | |
14015 | if (interface_type == NULL) | |
5c491127 | 14016 | { |
14017 | if (!type->is_error_type()) | |
14018 | this->report_error(_("expected interface or pointer to interface")); | |
14019 | } | |
e440a328 | 14020 | else |
14021 | { | |
14022 | const Typed_identifier* method = | |
14023 | interface_type->find_method(this->name_); | |
14024 | if (method == NULL) | |
14025 | { | |
631d5788 | 14026 | go_error_at(this->location(), "method %qs not in interface", |
14027 | Gogo::message_name(this->name_).c_str()); | |
e440a328 | 14028 | this->set_is_error(); |
14029 | } | |
14030 | } | |
14031 | } | |
14032 | ||
0afbb937 | 14033 | // If an interface field reference is not simply called, then it is |
14034 | // represented as a closure. The closure will hold a single variable, | |
14035 | // the value of the interface on which the method should be called. | |
14036 | // The function will be a simple thunk that pulls the value from the | |
14037 | // closure and calls the method with the remaining arguments. | |
14038 | ||
14039 | // Because method values are not common, we don't build all thunks for | |
14040 | // all possible interface methods, but instead only build them as we | |
14041 | // need them. In particular, we even build them on demand for | |
14042 | // interface methods defined in other packages. | |
14043 | ||
14044 | Interface_field_reference_expression::Interface_method_thunks | |
14045 | Interface_field_reference_expression::interface_method_thunks; | |
14046 | ||
14047 | // Find or create the thunk to call method NAME on TYPE. | |
14048 | ||
14049 | Named_object* | |
14050 | Interface_field_reference_expression::create_thunk(Gogo* gogo, | |
14051 | Interface_type* type, | |
14052 | const std::string& name) | |
14053 | { | |
14054 | std::pair<Interface_type*, Method_thunks*> val(type, NULL); | |
14055 | std::pair<Interface_method_thunks::iterator, bool> ins = | |
14056 | Interface_field_reference_expression::interface_method_thunks.insert(val); | |
14057 | if (ins.second) | |
14058 | { | |
14059 | // This is the first time we have seen this interface. | |
14060 | ins.first->second = new Method_thunks(); | |
14061 | } | |
14062 | ||
14063 | for (Method_thunks::const_iterator p = ins.first->second->begin(); | |
14064 | p != ins.first->second->end(); | |
14065 | p++) | |
14066 | if (p->first == name) | |
14067 | return p->second; | |
14068 | ||
14069 | Location loc = type->location(); | |
14070 | ||
14071 | const Typed_identifier* method_id = type->find_method(name); | |
14072 | if (method_id == NULL) | |
13f2fdb8 | 14073 | return Named_object::make_erroneous_name(gogo->thunk_name()); |
0afbb937 | 14074 | |
14075 | Function_type* orig_fntype = method_id->type()->function_type(); | |
14076 | if (orig_fntype == NULL) | |
13f2fdb8 | 14077 | return Named_object::make_erroneous_name(gogo->thunk_name()); |
0afbb937 | 14078 | |
14079 | Struct_field_list* sfl = new Struct_field_list(); | |
f8bdf81a | 14080 | // The type here is wrong--it should be the C function type. But it |
14081 | // doesn't really matter. | |
0afbb937 | 14082 | Type* vt = Type::make_pointer_type(Type::make_void_type()); |
13f2fdb8 | 14083 | sfl->push_back(Struct_field(Typed_identifier("fn", vt, loc))); |
14084 | sfl->push_back(Struct_field(Typed_identifier("val", type, loc))); | |
6bf4793c | 14085 | Struct_type* st = Type::make_struct_type(sfl, loc); |
14086 | st->set_is_struct_incomparable(); | |
14087 | Type* closure_type = Type::make_pointer_type(st); | |
0afbb937 | 14088 | |
f8bdf81a | 14089 | Function_type* new_fntype = orig_fntype->copy_with_names(); |
0afbb937 | 14090 | |
13f2fdb8 | 14091 | std::string thunk_name = gogo->thunk_name(); |
da244e59 | 14092 | Named_object* new_no = gogo->start_function(thunk_name, new_fntype, |
0afbb937 | 14093 | false, loc); |
14094 | ||
f8bdf81a | 14095 | Variable* cvar = new Variable(closure_type, NULL, false, false, false, loc); |
14096 | cvar->set_is_used(); | |
1ecc6157 | 14097 | cvar->set_is_closure(); |
da244e59 | 14098 | Named_object* cp = Named_object::make_variable("$closure" + thunk_name, |
14099 | NULL, cvar); | |
f8bdf81a | 14100 | new_no->func_value()->set_closure_var(cp); |
0afbb937 | 14101 | |
f8bdf81a | 14102 | gogo->start_block(loc); |
0afbb937 | 14103 | |
14104 | // Field 0 of the closure is the function code pointer, field 1 is | |
14105 | // the value on which to invoke the method. | |
14106 | Expression* arg = Expression::make_var_reference(cp, loc); | |
f614ea8b | 14107 | arg = Expression::make_dereference(arg, NIL_CHECK_NOT_NEEDED, loc); |
0afbb937 | 14108 | arg = Expression::make_field_reference(arg, 1, loc); |
14109 | ||
14110 | Expression *ifre = Expression::make_interface_field_reference(arg, name, | |
14111 | loc); | |
14112 | ||
14113 | const Typed_identifier_list* orig_params = orig_fntype->parameters(); | |
14114 | Expression_list* args; | |
14115 | if (orig_params == NULL || orig_params->empty()) | |
14116 | args = NULL; | |
14117 | else | |
14118 | { | |
14119 | const Typed_identifier_list* new_params = new_fntype->parameters(); | |
14120 | args = new Expression_list(); | |
14121 | for (Typed_identifier_list::const_iterator p = new_params->begin(); | |
f8bdf81a | 14122 | p != new_params->end(); |
0afbb937 | 14123 | ++p) |
14124 | { | |
14125 | Named_object* p_no = gogo->lookup(p->name(), NULL); | |
14126 | go_assert(p_no != NULL | |
14127 | && p_no->is_variable() | |
14128 | && p_no->var_value()->is_parameter()); | |
14129 | args->push_back(Expression::make_var_reference(p_no, loc)); | |
14130 | } | |
14131 | } | |
14132 | ||
14133 | Call_expression* call = Expression::make_call(ifre, args, | |
14134 | orig_fntype->is_varargs(), | |
14135 | loc); | |
14136 | call->set_varargs_are_lowered(); | |
14137 | ||
14138 | Statement* s = Statement::make_return_from_call(call, loc); | |
14139 | gogo->add_statement(s); | |
14140 | Block* b = gogo->finish_block(loc); | |
14141 | gogo->add_block(b, loc); | |
14142 | gogo->lower_block(new_no, b); | |
a32698ee | 14143 | gogo->flatten_block(new_no, b); |
0afbb937 | 14144 | gogo->finish_function(loc); |
14145 | ||
14146 | ins.first->second->push_back(std::make_pair(name, new_no)); | |
14147 | return new_no; | |
14148 | } | |
14149 | ||
ea664253 | 14150 | // Get the backend representation for a method value. |
e440a328 | 14151 | |
ea664253 | 14152 | Bexpression* |
14153 | Interface_field_reference_expression::do_get_backend(Translate_context* context) | |
e440a328 | 14154 | { |
0afbb937 | 14155 | Interface_type* type = this->expr_->type()->interface_type(); |
14156 | if (type == NULL) | |
14157 | { | |
14158 | go_assert(saw_errors()); | |
ea664253 | 14159 | return context->backend()->error_expression(); |
0afbb937 | 14160 | } |
14161 | ||
14162 | Named_object* thunk = | |
14163 | Interface_field_reference_expression::create_thunk(context->gogo(), | |
14164 | type, this->name_); | |
14165 | if (thunk->is_erroneous()) | |
14166 | { | |
14167 | go_assert(saw_errors()); | |
ea664253 | 14168 | return context->backend()->error_expression(); |
0afbb937 | 14169 | } |
14170 | ||
14171 | // FIXME: We should lower this earlier, but we can't it lower it in | |
14172 | // the lowering pass because at that point we don't know whether we | |
14173 | // need to create the thunk or not. If the expression is called, we | |
14174 | // don't need the thunk. | |
14175 | ||
14176 | Location loc = this->location(); | |
14177 | ||
14178 | Struct_field_list* fields = new Struct_field_list(); | |
13f2fdb8 | 14179 | fields->push_back(Struct_field(Typed_identifier("fn", |
0afbb937 | 14180 | thunk->func_value()->type(), |
14181 | loc))); | |
13f2fdb8 | 14182 | fields->push_back(Struct_field(Typed_identifier("val", |
0afbb937 | 14183 | this->expr_->type(), |
14184 | loc))); | |
14185 | Struct_type* st = Type::make_struct_type(fields, loc); | |
6bf4793c | 14186 | st->set_is_struct_incomparable(); |
0afbb937 | 14187 | |
14188 | Expression_list* vals = new Expression_list(); | |
14189 | vals->push_back(Expression::make_func_code_reference(thunk, loc)); | |
14190 | vals->push_back(this->expr_); | |
14191 | ||
14192 | Expression* expr = Expression::make_struct_composite_literal(st, vals, loc); | |
ea664253 | 14193 | Bexpression* bclosure = |
14194 | Expression::make_heap_expression(expr, loc)->get_backend(context); | |
0afbb937 | 14195 | |
4df0c2d4 | 14196 | Gogo* gogo = context->gogo(); |
14197 | Btype* btype = this->type()->get_backend(gogo); | |
14198 | bclosure = gogo->backend()->convert_expression(btype, bclosure, loc); | |
14199 | ||
2387f644 | 14200 | Expression* nil_check = |
14201 | Expression::make_binary(OPERATOR_EQEQ, this->expr_, | |
14202 | Expression::make_nil(loc), loc); | |
ea664253 | 14203 | Bexpression* bnil_check = nil_check->get_backend(context); |
0afbb937 | 14204 | |
ea664253 | 14205 | Bexpression* bcrash = gogo->runtime_error(RUNTIME_ERROR_NIL_DEREFERENCE, |
14206 | loc)->get_backend(context); | |
2387f644 | 14207 | |
93715b75 | 14208 | Bfunction* bfn = context->function()->func_value()->get_decl(); |
2387f644 | 14209 | Bexpression* bcond = |
93715b75 | 14210 | gogo->backend()->conditional_expression(bfn, NULL, |
14211 | bnil_check, bcrash, NULL, loc); | |
0ab48656 | 14212 | Bfunction* bfunction = context->function()->func_value()->get_decl(); |
14213 | Bstatement* cond_statement = | |
14214 | gogo->backend()->expression_statement(bfunction, bcond); | |
ea664253 | 14215 | return gogo->backend()->compound_expression(cond_statement, bclosure, loc); |
e440a328 | 14216 | } |
14217 | ||
d751bb78 | 14218 | // Dump ast representation for an interface field reference. |
14219 | ||
14220 | void | |
14221 | Interface_field_reference_expression::do_dump_expression( | |
14222 | Ast_dump_context* ast_dump_context) const | |
14223 | { | |
14224 | this->expr_->dump_expression(ast_dump_context); | |
14225 | ast_dump_context->ostream() << "." << this->name_; | |
14226 | } | |
14227 | ||
e440a328 | 14228 | // Make a reference to a field in an interface. |
14229 | ||
14230 | Expression* | |
14231 | Expression::make_interface_field_reference(Expression* expr, | |
14232 | const std::string& field, | |
b13c66cd | 14233 | Location location) |
e440a328 | 14234 | { |
14235 | return new Interface_field_reference_expression(expr, field, location); | |
14236 | } | |
14237 | ||
14238 | // A general selector. This is a Parser_expression for LEFT.NAME. It | |
14239 | // is lowered after we know the type of the left hand side. | |
14240 | ||
14241 | class Selector_expression : public Parser_expression | |
14242 | { | |
14243 | public: | |
14244 | Selector_expression(Expression* left, const std::string& name, | |
b13c66cd | 14245 | Location location) |
e440a328 | 14246 | : Parser_expression(EXPRESSION_SELECTOR, location), |
14247 | left_(left), name_(name) | |
14248 | { } | |
14249 | ||
14250 | protected: | |
14251 | int | |
14252 | do_traverse(Traverse* traverse) | |
14253 | { return Expression::traverse(&this->left_, traverse); } | |
14254 | ||
14255 | Expression* | |
ceeb4318 | 14256 | do_lower(Gogo*, Named_object*, Statement_inserter*, int); |
e440a328 | 14257 | |
14258 | Expression* | |
14259 | do_copy() | |
14260 | { | |
14261 | return new Selector_expression(this->left_->copy(), this->name_, | |
14262 | this->location()); | |
14263 | } | |
14264 | ||
d751bb78 | 14265 | void |
14266 | do_dump_expression(Ast_dump_context* ast_dump_context) const; | |
14267 | ||
e440a328 | 14268 | private: |
14269 | Expression* | |
14270 | lower_method_expression(Gogo*); | |
14271 | ||
14272 | // The expression on the left hand side. | |
14273 | Expression* left_; | |
14274 | // The name on the right hand side. | |
14275 | std::string name_; | |
14276 | }; | |
14277 | ||
14278 | // Lower a selector expression once we know the real type of the left | |
14279 | // hand side. | |
14280 | ||
14281 | Expression* | |
ceeb4318 | 14282 | Selector_expression::do_lower(Gogo* gogo, Named_object*, Statement_inserter*, |
14283 | int) | |
e440a328 | 14284 | { |
14285 | Expression* left = this->left_; | |
14286 | if (left->is_type_expression()) | |
14287 | return this->lower_method_expression(gogo); | |
14288 | return Type::bind_field_or_method(gogo, left->type(), left, this->name_, | |
14289 | this->location()); | |
14290 | } | |
14291 | ||
14292 | // Lower a method expression T.M or (*T).M. We turn this into a | |
14293 | // function literal. | |
14294 | ||
14295 | Expression* | |
14296 | Selector_expression::lower_method_expression(Gogo* gogo) | |
14297 | { | |
b13c66cd | 14298 | Location location = this->location(); |
868b439e | 14299 | Type* left_type = this->left_->type(); |
14300 | Type* type = left_type; | |
e440a328 | 14301 | const std::string& name(this->name_); |
14302 | ||
14303 | bool is_pointer; | |
14304 | if (type->points_to() == NULL) | |
14305 | is_pointer = false; | |
14306 | else | |
14307 | { | |
14308 | is_pointer = true; | |
14309 | type = type->points_to(); | |
14310 | } | |
14311 | Named_type* nt = type->named_type(); | |
14312 | if (nt == NULL) | |
14313 | { | |
631d5788 | 14314 | go_error_at(location, |
14315 | ("method expression requires named type or " | |
14316 | "pointer to named type")); | |
e440a328 | 14317 | return Expression::make_error(location); |
14318 | } | |
14319 | ||
14320 | bool is_ambiguous; | |
14321 | Method* method = nt->method_function(name, &is_ambiguous); | |
ab1468c3 | 14322 | const Typed_identifier* imethod = NULL; |
dcc8506b | 14323 | if (method == NULL && !is_pointer) |
ab1468c3 | 14324 | { |
14325 | Interface_type* it = nt->interface_type(); | |
14326 | if (it != NULL) | |
14327 | imethod = it->find_method(name); | |
14328 | } | |
14329 | ||
f03a9fbf | 14330 | if ((method == NULL && imethod == NULL) |
868b439e | 14331 | || (left_type->named_type() != NULL && left_type->points_to() != NULL)) |
e440a328 | 14332 | { |
14333 | if (!is_ambiguous) | |
631d5788 | 14334 | go_error_at(location, "type %<%s%s%> has no method %<%s%>", |
14335 | is_pointer ? "*" : "", | |
14336 | nt->message_name().c_str(), | |
14337 | Gogo::message_name(name).c_str()); | |
e440a328 | 14338 | else |
631d5788 | 14339 | go_error_at(location, "method %<%s%s%> is ambiguous in type %<%s%>", |
14340 | Gogo::message_name(name).c_str(), | |
14341 | is_pointer ? "*" : "", | |
14342 | nt->message_name().c_str()); | |
e440a328 | 14343 | return Expression::make_error(location); |
14344 | } | |
14345 | ||
ab1468c3 | 14346 | if (method != NULL && !is_pointer && !method->is_value_method()) |
e440a328 | 14347 | { |
631d5788 | 14348 | go_error_at(location, "method requires pointer (use %<(*%s).%s%>)", |
14349 | nt->message_name().c_str(), | |
14350 | Gogo::message_name(name).c_str()); | |
e440a328 | 14351 | return Expression::make_error(location); |
14352 | } | |
14353 | ||
14354 | // Build a new function type in which the receiver becomes the first | |
14355 | // argument. | |
ab1468c3 | 14356 | Function_type* method_type; |
14357 | if (method != NULL) | |
14358 | { | |
14359 | method_type = method->type(); | |
c484d925 | 14360 | go_assert(method_type->is_method()); |
ab1468c3 | 14361 | } |
14362 | else | |
14363 | { | |
14364 | method_type = imethod->type()->function_type(); | |
c484d925 | 14365 | go_assert(method_type != NULL && !method_type->is_method()); |
ab1468c3 | 14366 | } |
e440a328 | 14367 | |
14368 | const char* const receiver_name = "$this"; | |
14369 | Typed_identifier_list* parameters = new Typed_identifier_list(); | |
14370 | parameters->push_back(Typed_identifier(receiver_name, this->left_->type(), | |
14371 | location)); | |
14372 | ||
14373 | const Typed_identifier_list* method_parameters = method_type->parameters(); | |
14374 | if (method_parameters != NULL) | |
14375 | { | |
f470da59 | 14376 | int i = 0; |
e440a328 | 14377 | for (Typed_identifier_list::const_iterator p = method_parameters->begin(); |
14378 | p != method_parameters->end(); | |
f470da59 | 14379 | ++p, ++i) |
14380 | { | |
68883531 | 14381 | if (!p->name().empty()) |
f470da59 | 14382 | parameters->push_back(*p); |
14383 | else | |
14384 | { | |
14385 | char buf[20]; | |
14386 | snprintf(buf, sizeof buf, "$param%d", i); | |
14387 | parameters->push_back(Typed_identifier(buf, p->type(), | |
14388 | p->location())); | |
14389 | } | |
14390 | } | |
e440a328 | 14391 | } |
14392 | ||
14393 | const Typed_identifier_list* method_results = method_type->results(); | |
14394 | Typed_identifier_list* results; | |
14395 | if (method_results == NULL) | |
14396 | results = NULL; | |
14397 | else | |
14398 | { | |
14399 | results = new Typed_identifier_list(); | |
14400 | for (Typed_identifier_list::const_iterator p = method_results->begin(); | |
14401 | p != method_results->end(); | |
14402 | ++p) | |
14403 | results->push_back(*p); | |
14404 | } | |
f03a9fbf | 14405 | |
e440a328 | 14406 | Function_type* fntype = Type::make_function_type(NULL, parameters, results, |
14407 | location); | |
14408 | if (method_type->is_varargs()) | |
14409 | fntype->set_is_varargs(); | |
14410 | ||
14411 | // We generate methods which always takes a pointer to the receiver | |
14412 | // as their first argument. If this is for a pointer type, we can | |
14413 | // simply reuse the existing function. We use an internal hack to | |
14414 | // get the right type. | |
8381eda7 | 14415 | // FIXME: This optimization is disabled because it doesn't yet work |
14416 | // with function descriptors when the method expression is not | |
14417 | // directly called. | |
14418 | if (method != NULL && is_pointer && false) | |
e440a328 | 14419 | { |
14420 | Named_object* mno = (method->needs_stub_method() | |
14421 | ? method->stub_object() | |
14422 | : method->named_object()); | |
14423 | Expression* f = Expression::make_func_reference(mno, NULL, location); | |
14424 | f = Expression::make_cast(fntype, f, location); | |
14425 | Type_conversion_expression* tce = | |
14426 | static_cast<Type_conversion_expression*>(f); | |
14427 | tce->set_may_convert_function_types(); | |
14428 | return f; | |
14429 | } | |
14430 | ||
13f2fdb8 | 14431 | Named_object* no = gogo->start_function(gogo->thunk_name(), fntype, false, |
e440a328 | 14432 | location); |
14433 | ||
14434 | Named_object* vno = gogo->lookup(receiver_name, NULL); | |
c484d925 | 14435 | go_assert(vno != NULL); |
e440a328 | 14436 | Expression* ve = Expression::make_var_reference(vno, location); |
ab1468c3 | 14437 | Expression* bm; |
14438 | if (method != NULL) | |
14439 | bm = Type::bind_field_or_method(gogo, nt, ve, name, location); | |
14440 | else | |
14441 | bm = Expression::make_interface_field_reference(ve, name, location); | |
f690b0bb | 14442 | |
14443 | // Even though we found the method above, if it has an error type we | |
14444 | // may see an error here. | |
14445 | if (bm->is_error_expression()) | |
463fe805 | 14446 | { |
14447 | gogo->finish_function(location); | |
14448 | return bm; | |
14449 | } | |
e440a328 | 14450 | |
14451 | Expression_list* args; | |
f470da59 | 14452 | if (parameters->size() <= 1) |
e440a328 | 14453 | args = NULL; |
14454 | else | |
14455 | { | |
14456 | args = new Expression_list(); | |
f470da59 | 14457 | Typed_identifier_list::const_iterator p = parameters->begin(); |
14458 | ++p; | |
14459 | for (; p != parameters->end(); ++p) | |
e440a328 | 14460 | { |
14461 | vno = gogo->lookup(p->name(), NULL); | |
c484d925 | 14462 | go_assert(vno != NULL); |
e440a328 | 14463 | args->push_back(Expression::make_var_reference(vno, location)); |
14464 | } | |
14465 | } | |
14466 | ||
ceeb4318 | 14467 | gogo->start_block(location); |
14468 | ||
e440a328 | 14469 | Call_expression* call = Expression::make_call(bm, args, |
14470 | method_type->is_varargs(), | |
14471 | location); | |
14472 | ||
0afbb937 | 14473 | Statement* s = Statement::make_return_from_call(call, location); |
e440a328 | 14474 | gogo->add_statement(s); |
14475 | ||
ceeb4318 | 14476 | Block* b = gogo->finish_block(location); |
14477 | ||
14478 | gogo->add_block(b, location); | |
14479 | ||
14480 | // Lower the call in case there are multiple results. | |
14481 | gogo->lower_block(no, b); | |
a32698ee | 14482 | gogo->flatten_block(no, b); |
ceeb4318 | 14483 | |
e440a328 | 14484 | gogo->finish_function(location); |
14485 | ||
14486 | return Expression::make_func_reference(no, NULL, location); | |
14487 | } | |
14488 | ||
d751bb78 | 14489 | // Dump the ast for a selector expression. |
14490 | ||
14491 | void | |
f03a9fbf | 14492 | Selector_expression::do_dump_expression(Ast_dump_context* ast_dump_context) |
d751bb78 | 14493 | const |
14494 | { | |
14495 | ast_dump_context->dump_expression(this->left_); | |
14496 | ast_dump_context->ostream() << "."; | |
14497 | ast_dump_context->ostream() << this->name_; | |
14498 | } | |
f03a9fbf | 14499 | |
e440a328 | 14500 | // Make a selector expression. |
14501 | ||
14502 | Expression* | |
14503 | Expression::make_selector(Expression* left, const std::string& name, | |
b13c66cd | 14504 | Location location) |
e440a328 | 14505 | { |
14506 | return new Selector_expression(left, name, location); | |
14507 | } | |
14508 | ||
da244e59 | 14509 | // Class Allocation_expression. |
e440a328 | 14510 | |
da244e59 | 14511 | int |
14512 | Allocation_expression::do_traverse(Traverse* traverse) | |
e440a328 | 14513 | { |
da244e59 | 14514 | return Type::traverse(this->type_, traverse); |
14515 | } | |
e440a328 | 14516 | |
da244e59 | 14517 | Type* |
14518 | Allocation_expression::do_type() | |
14519 | { | |
14520 | return Type::make_pointer_type(this->type_); | |
14521 | } | |
e440a328 | 14522 | |
22deed0d | 14523 | void |
14524 | Allocation_expression::do_check_types(Gogo*) | |
14525 | { | |
14526 | if (!this->type_->in_heap()) | |
37423a84 | 14527 | go_error_at(this->location(), "cannot heap allocate go:notinheap type"); |
22deed0d | 14528 | } |
14529 | ||
da244e59 | 14530 | // Make a copy of an allocation expression. |
e440a328 | 14531 | |
da244e59 | 14532 | Expression* |
14533 | Allocation_expression::do_copy() | |
14534 | { | |
14535 | Allocation_expression* alloc = | |
de590a61 | 14536 | new Allocation_expression(this->type_->copy_expressions(), |
14537 | this->location()); | |
da244e59 | 14538 | if (this->allocate_on_stack_) |
14539 | alloc->set_allocate_on_stack(); | |
20a381c4 | 14540 | if (this->no_zero_) |
14541 | alloc->set_no_zero(); | |
da244e59 | 14542 | return alloc; |
14543 | } | |
e440a328 | 14544 | |
ea664253 | 14545 | // Return the backend representation for an allocation expression. |
e440a328 | 14546 | |
ea664253 | 14547 | Bexpression* |
14548 | Allocation_expression::do_get_backend(Translate_context* context) | |
e440a328 | 14549 | { |
2c809f8f | 14550 | Gogo* gogo = context->gogo(); |
14551 | Location loc = this->location(); | |
06e83d10 | 14552 | Btype* btype = this->type_->get_backend(gogo); |
da244e59 | 14553 | |
5973ede0 | 14554 | if (this->allocate_on_stack_) |
da244e59 | 14555 | { |
2a305b85 | 14556 | int64_t size; |
14557 | bool ok = this->type_->backend_type_size(gogo, &size); | |
14558 | if (!ok) | |
14559 | { | |
14560 | go_assert(saw_errors()); | |
14561 | return gogo->backend()->error_expression(); | |
14562 | } | |
06e83d10 | 14563 | Bstatement* decl; |
14564 | Named_object* fn = context->function(); | |
14565 | go_assert(fn != NULL); | |
14566 | Bfunction* fndecl = fn->func_value()->get_or_make_decl(gogo, fn); | |
20a381c4 | 14567 | Bexpression* init = (this->no_zero_ |
14568 | ? NULL | |
14569 | : gogo->backend()->zero_expression(btype)); | |
06e83d10 | 14570 | Bvariable* temp = |
14571 | gogo->backend()->temporary_variable(fndecl, context->bblock(), btype, | |
20a381c4 | 14572 | init, true, loc, &decl); |
06e83d10 | 14573 | Bexpression* ret = gogo->backend()->var_expression(temp, loc); |
14574 | ret = gogo->backend()->address_expression(ret, loc); | |
14575 | ret = gogo->backend()->compound_expression(decl, ret, loc); | |
14576 | return ret; | |
da244e59 | 14577 | } |
14578 | ||
2a305b85 | 14579 | Bexpression* space = |
ea664253 | 14580 | gogo->allocate_memory(this->type_, loc)->get_backend(context); |
d5d1c295 | 14581 | Btype* pbtype = gogo->backend()->pointer_type(btype); |
ea664253 | 14582 | return gogo->backend()->convert_expression(pbtype, space, loc); |
e440a328 | 14583 | } |
14584 | ||
d751bb78 | 14585 | // Dump ast representation for an allocation expression. |
14586 | ||
14587 | void | |
f03a9fbf | 14588 | Allocation_expression::do_dump_expression(Ast_dump_context* ast_dump_context) |
d751bb78 | 14589 | const |
14590 | { | |
14591 | ast_dump_context->ostream() << "new("; | |
14592 | ast_dump_context->dump_type(this->type_); | |
14593 | ast_dump_context->ostream() << ")"; | |
14594 | } | |
14595 | ||
e440a328 | 14596 | // Make an allocation expression. |
14597 | ||
14598 | Expression* | |
b13c66cd | 14599 | Expression::make_allocation(Type* type, Location location) |
e440a328 | 14600 | { |
14601 | return new Allocation_expression(type, location); | |
14602 | } | |
14603 | ||
e32de7ba | 14604 | // Class Ordered_value_list. |
e440a328 | 14605 | |
14606 | int | |
e32de7ba | 14607 | Ordered_value_list::traverse_vals(Traverse* traverse) |
e440a328 | 14608 | { |
0c4f5a19 | 14609 | if (this->vals_ != NULL) |
14610 | { | |
14611 | if (this->traverse_order_ == NULL) | |
14612 | { | |
14613 | if (this->vals_->traverse(traverse) == TRAVERSE_EXIT) | |
14614 | return TRAVERSE_EXIT; | |
14615 | } | |
14616 | else | |
14617 | { | |
e32de7ba | 14618 | for (std::vector<unsigned long>::const_iterator p = |
14619 | this->traverse_order_->begin(); | |
0c4f5a19 | 14620 | p != this->traverse_order_->end(); |
14621 | ++p) | |
14622 | { | |
14623 | if (Expression::traverse(&this->vals_->at(*p), traverse) | |
14624 | == TRAVERSE_EXIT) | |
14625 | return TRAVERSE_EXIT; | |
14626 | } | |
14627 | } | |
14628 | } | |
e32de7ba | 14629 | return TRAVERSE_CONTINUE; |
14630 | } | |
14631 | ||
14632 | // Class Struct_construction_expression. | |
14633 | ||
14634 | // Traversal. | |
14635 | ||
14636 | int | |
14637 | Struct_construction_expression::do_traverse(Traverse* traverse) | |
14638 | { | |
14639 | if (this->traverse_vals(traverse) == TRAVERSE_EXIT) | |
14640 | return TRAVERSE_EXIT; | |
e440a328 | 14641 | if (Type::traverse(this->type_, traverse) == TRAVERSE_EXIT) |
14642 | return TRAVERSE_EXIT; | |
14643 | return TRAVERSE_CONTINUE; | |
14644 | } | |
14645 | ||
14646 | // Return whether this is a constant initializer. | |
14647 | ||
14648 | bool | |
14649 | Struct_construction_expression::is_constant_struct() const | |
14650 | { | |
e32de7ba | 14651 | if (this->vals() == NULL) |
e440a328 | 14652 | return true; |
e32de7ba | 14653 | for (Expression_list::const_iterator pv = this->vals()->begin(); |
14654 | pv != this->vals()->end(); | |
e440a328 | 14655 | ++pv) |
14656 | { | |
14657 | if (*pv != NULL | |
14658 | && !(*pv)->is_constant() | |
14659 | && (!(*pv)->is_composite_literal() | |
14660 | || (*pv)->is_nonconstant_composite_literal())) | |
14661 | return false; | |
14662 | } | |
14663 | ||
14664 | const Struct_field_list* fields = this->type_->struct_type()->fields(); | |
14665 | for (Struct_field_list::const_iterator pf = fields->begin(); | |
14666 | pf != fields->end(); | |
14667 | ++pf) | |
14668 | { | |
14669 | // There are no constant constructors for interfaces. | |
14670 | if (pf->type()->interface_type() != NULL) | |
14671 | return false; | |
14672 | } | |
14673 | ||
14674 | return true; | |
14675 | } | |
14676 | ||
d2199dbc | 14677 | // Return whether this is a zero value. |
14678 | ||
14679 | bool | |
14680 | Struct_construction_expression::do_is_zero_value() const | |
14681 | { | |
14682 | if (this->vals() == NULL) | |
14683 | return true; | |
14684 | for (Expression_list::const_iterator pv = this->vals()->begin(); | |
14685 | pv != this->vals()->end(); | |
14686 | ++pv) | |
14687 | if (*pv != NULL && !(*pv)->is_zero_value()) | |
14688 | return false; | |
14689 | ||
14690 | const Struct_field_list* fields = this->type_->struct_type()->fields(); | |
14691 | for (Struct_field_list::const_iterator pf = fields->begin(); | |
14692 | pf != fields->end(); | |
14693 | ++pf) | |
14694 | { | |
14695 | // Interface conversion may cause a zero value being converted | |
14696 | // to a non-zero value, like interface{}(0). Be conservative. | |
14697 | if (pf->type()->interface_type() != NULL) | |
14698 | return false; | |
14699 | } | |
14700 | ||
14701 | return true; | |
14702 | } | |
14703 | ||
3ae06f68 | 14704 | // Return whether this struct can be used as a constant initializer. |
f9ca30f9 | 14705 | |
14706 | bool | |
3ae06f68 | 14707 | Struct_construction_expression::do_is_static_initializer() const |
f9ca30f9 | 14708 | { |
e32de7ba | 14709 | if (this->vals() == NULL) |
f9ca30f9 | 14710 | return true; |
e32de7ba | 14711 | for (Expression_list::const_iterator pv = this->vals()->begin(); |
14712 | pv != this->vals()->end(); | |
f9ca30f9 | 14713 | ++pv) |
14714 | { | |
3ae06f68 | 14715 | if (*pv != NULL && !(*pv)->is_static_initializer()) |
f9ca30f9 | 14716 | return false; |
14717 | } | |
de048538 | 14718 | |
14719 | const Struct_field_list* fields = this->type_->struct_type()->fields(); | |
14720 | for (Struct_field_list::const_iterator pf = fields->begin(); | |
14721 | pf != fields->end(); | |
14722 | ++pf) | |
14723 | { | |
14724 | // There are no constant constructors for interfaces. | |
14725 | if (pf->type()->interface_type() != NULL) | |
14726 | return false; | |
14727 | } | |
14728 | ||
f9ca30f9 | 14729 | return true; |
14730 | } | |
14731 | ||
e440a328 | 14732 | // Final type determination. |
14733 | ||
14734 | void | |
14735 | Struct_construction_expression::do_determine_type(const Type_context*) | |
14736 | { | |
e32de7ba | 14737 | if (this->vals() == NULL) |
e440a328 | 14738 | return; |
14739 | const Struct_field_list* fields = this->type_->struct_type()->fields(); | |
e32de7ba | 14740 | Expression_list::const_iterator pv = this->vals()->begin(); |
e440a328 | 14741 | for (Struct_field_list::const_iterator pf = fields->begin(); |
14742 | pf != fields->end(); | |
14743 | ++pf, ++pv) | |
14744 | { | |
e32de7ba | 14745 | if (pv == this->vals()->end()) |
e440a328 | 14746 | return; |
14747 | if (*pv != NULL) | |
14748 | { | |
14749 | Type_context subcontext(pf->type(), false); | |
14750 | (*pv)->determine_type(&subcontext); | |
14751 | } | |
14752 | } | |
a6cb4c0e | 14753 | // Extra values are an error we will report elsewhere; we still want |
14754 | // to determine the type to avoid knockon errors. | |
e32de7ba | 14755 | for (; pv != this->vals()->end(); ++pv) |
a6cb4c0e | 14756 | (*pv)->determine_type_no_context(); |
e440a328 | 14757 | } |
14758 | ||
14759 | // Check types. | |
14760 | ||
14761 | void | |
14762 | Struct_construction_expression::do_check_types(Gogo*) | |
14763 | { | |
e32de7ba | 14764 | if (this->vals() == NULL) |
e440a328 | 14765 | return; |
14766 | ||
14767 | Struct_type* st = this->type_->struct_type(); | |
e32de7ba | 14768 | if (this->vals()->size() > st->field_count()) |
e440a328 | 14769 | { |
14770 | this->report_error(_("too many expressions for struct")); | |
14771 | return; | |
14772 | } | |
14773 | ||
14774 | const Struct_field_list* fields = st->fields(); | |
e32de7ba | 14775 | Expression_list::const_iterator pv = this->vals()->begin(); |
e440a328 | 14776 | int i = 0; |
14777 | for (Struct_field_list::const_iterator pf = fields->begin(); | |
14778 | pf != fields->end(); | |
14779 | ++pf, ++pv, ++i) | |
14780 | { | |
e32de7ba | 14781 | if (pv == this->vals()->end()) |
e440a328 | 14782 | { |
14783 | this->report_error(_("too few expressions for struct")); | |
14784 | break; | |
14785 | } | |
14786 | ||
14787 | if (*pv == NULL) | |
14788 | continue; | |
14789 | ||
14790 | std::string reason; | |
14791 | if (!Type::are_assignable(pf->type(), (*pv)->type(), &reason)) | |
14792 | { | |
14793 | if (reason.empty()) | |
631d5788 | 14794 | go_error_at((*pv)->location(), |
14795 | "incompatible type for field %d in struct construction", | |
14796 | i + 1); | |
e440a328 | 14797 | else |
631d5788 | 14798 | go_error_at((*pv)->location(), |
14799 | ("incompatible type for field %d in " | |
14800 | "struct construction (%s)"), | |
14801 | i + 1, reason.c_str()); | |
e440a328 | 14802 | this->set_is_error(); |
14803 | } | |
14804 | } | |
e32de7ba | 14805 | go_assert(pv == this->vals()->end()); |
e440a328 | 14806 | } |
14807 | ||
de590a61 | 14808 | // Copy. |
14809 | ||
14810 | Expression* | |
14811 | Struct_construction_expression::do_copy() | |
14812 | { | |
14813 | Struct_construction_expression* ret = | |
14814 | new Struct_construction_expression(this->type_->copy_expressions(), | |
14815 | (this->vals() == NULL | |
14816 | ? NULL | |
14817 | : this->vals()->copy()), | |
14818 | this->location()); | |
14819 | if (this->traverse_order() != NULL) | |
14820 | ret->set_traverse_order(this->traverse_order()); | |
14821 | return ret; | |
14822 | } | |
14823 | ||
8ba8cc87 | 14824 | // Flatten a struct construction expression. Store the values into |
14825 | // temporaries in case they need interface conversion. | |
14826 | ||
14827 | Expression* | |
14828 | Struct_construction_expression::do_flatten(Gogo*, Named_object*, | |
14829 | Statement_inserter* inserter) | |
14830 | { | |
e32de7ba | 14831 | if (this->vals() == NULL) |
8ba8cc87 | 14832 | return this; |
14833 | ||
14834 | // If this is a constant struct, we don't need temporaries. | |
de048538 | 14835 | if (this->is_constant_struct() || this->is_static_initializer()) |
8ba8cc87 | 14836 | return this; |
14837 | ||
14838 | Location loc = this->location(); | |
e32de7ba | 14839 | for (Expression_list::iterator pv = this->vals()->begin(); |
14840 | pv != this->vals()->end(); | |
8ba8cc87 | 14841 | ++pv) |
14842 | { | |
14843 | if (*pv != NULL) | |
14844 | { | |
5bf8be8b | 14845 | if ((*pv)->is_error_expression() || (*pv)->type()->is_error_type()) |
14846 | { | |
14847 | go_assert(saw_errors()); | |
14848 | return Expression::make_error(loc); | |
14849 | } | |
8ba8cc87 | 14850 | if (!(*pv)->is_variable()) |
14851 | { | |
14852 | Temporary_statement* temp = | |
14853 | Statement::make_temporary(NULL, *pv, loc); | |
14854 | inserter->insert(temp); | |
14855 | *pv = Expression::make_temporary_reference(temp, loc); | |
14856 | } | |
14857 | } | |
14858 | } | |
14859 | return this; | |
14860 | } | |
14861 | ||
e007b1eb | 14862 | // Make implicit type conversions explicit. |
14863 | ||
14864 | void | |
14865 | Struct_construction_expression::do_add_conversions() | |
14866 | { | |
14867 | if (this->vals() == NULL) | |
14868 | return; | |
14869 | ||
14870 | Location loc = this->location(); | |
14871 | const Struct_field_list* fields = this->type_->struct_type()->fields(); | |
14872 | Expression_list::iterator pv = this->vals()->begin(); | |
14873 | for (Struct_field_list::const_iterator pf = fields->begin(); | |
14874 | pf != fields->end(); | |
14875 | ++pf, ++pv) | |
14876 | { | |
14877 | if (pv == this->vals()->end()) | |
14878 | break; | |
14879 | if (*pv != NULL) | |
14880 | { | |
14881 | Type* ft = pf->type(); | |
14882 | if (!Type::are_identical(ft, (*pv)->type(), 0, NULL) | |
14883 | && ft->interface_type() != NULL) | |
14884 | *pv = Expression::make_cast(ft, *pv, loc); | |
14885 | } | |
14886 | } | |
14887 | } | |
14888 | ||
ea664253 | 14889 | // Return the backend representation for constructing a struct. |
e440a328 | 14890 | |
ea664253 | 14891 | Bexpression* |
14892 | Struct_construction_expression::do_get_backend(Translate_context* context) | |
e440a328 | 14893 | { |
14894 | Gogo* gogo = context->gogo(); | |
14895 | ||
2c809f8f | 14896 | Btype* btype = this->type_->get_backend(gogo); |
e32de7ba | 14897 | if (this->vals() == NULL) |
ea664253 | 14898 | return gogo->backend()->zero_expression(btype); |
e440a328 | 14899 | |
e440a328 | 14900 | const Struct_field_list* fields = this->type_->struct_type()->fields(); |
e32de7ba | 14901 | Expression_list::const_iterator pv = this->vals()->begin(); |
2c809f8f | 14902 | std::vector<Bexpression*> init; |
14903 | for (Struct_field_list::const_iterator pf = fields->begin(); | |
14904 | pf != fields->end(); | |
14905 | ++pf) | |
e440a328 | 14906 | { |
63697958 | 14907 | Btype* fbtype = pf->type()->get_backend(gogo); |
e32de7ba | 14908 | if (pv == this->vals()->end()) |
2c809f8f | 14909 | init.push_back(gogo->backend()->zero_expression(fbtype)); |
e440a328 | 14910 | else if (*pv == NULL) |
14911 | { | |
2c809f8f | 14912 | init.push_back(gogo->backend()->zero_expression(fbtype)); |
e440a328 | 14913 | ++pv; |
14914 | } | |
14915 | else | |
14916 | { | |
2c809f8f | 14917 | Expression* val = |
14918 | Expression::convert_for_assignment(gogo, pf->type(), | |
14919 | *pv, this->location()); | |
ea664253 | 14920 | init.push_back(val->get_backend(context)); |
e440a328 | 14921 | ++pv; |
14922 | } | |
e440a328 | 14923 | } |
0fdf8340 | 14924 | if (this->type_->struct_type()->has_padding()) |
14925 | { | |
14926 | // Feed an extra value if there is a padding field. | |
14927 | Btype *fbtype = Type::lookup_integer_type("uint8")->get_backend(gogo); | |
14928 | init.push_back(gogo->backend()->zero_expression(fbtype)); | |
14929 | } | |
ea664253 | 14930 | return gogo->backend()->constructor_expression(btype, init, this->location()); |
e440a328 | 14931 | } |
14932 | ||
14933 | // Export a struct construction. | |
14934 | ||
14935 | void | |
548be246 | 14936 | Struct_construction_expression::do_export(Export_function_body* efb) const |
e440a328 | 14937 | { |
204d4af4 | 14938 | efb->write_c_string("$convert("); |
548be246 | 14939 | efb->write_type(this->type_); |
e32de7ba | 14940 | for (Expression_list::const_iterator pv = this->vals()->begin(); |
14941 | pv != this->vals()->end(); | |
e440a328 | 14942 | ++pv) |
14943 | { | |
548be246 | 14944 | efb->write_c_string(", "); |
e440a328 | 14945 | if (*pv != NULL) |
548be246 | 14946 | (*pv)->export_expression(efb); |
e440a328 | 14947 | } |
548be246 | 14948 | efb->write_c_string(")"); |
e440a328 | 14949 | } |
14950 | ||
d751bb78 | 14951 | // Dump ast representation of a struct construction expression. |
14952 | ||
14953 | void | |
14954 | Struct_construction_expression::do_dump_expression( | |
14955 | Ast_dump_context* ast_dump_context) const | |
14956 | { | |
d751bb78 | 14957 | ast_dump_context->dump_type(this->type_); |
14958 | ast_dump_context->ostream() << "{"; | |
e32de7ba | 14959 | ast_dump_context->dump_expression_list(this->vals()); |
d751bb78 | 14960 | ast_dump_context->ostream() << "}"; |
14961 | } | |
14962 | ||
e440a328 | 14963 | // Make a struct composite literal. This used by the thunk code. |
14964 | ||
14965 | Expression* | |
14966 | Expression::make_struct_composite_literal(Type* type, Expression_list* vals, | |
b13c66cd | 14967 | Location location) |
e440a328 | 14968 | { |
c484d925 | 14969 | go_assert(type->struct_type() != NULL); |
e440a328 | 14970 | return new Struct_construction_expression(type, vals, location); |
14971 | } | |
14972 | ||
da244e59 | 14973 | // Class Array_construction_expression. |
e440a328 | 14974 | |
14975 | // Traversal. | |
14976 | ||
14977 | int | |
14978 | Array_construction_expression::do_traverse(Traverse* traverse) | |
14979 | { | |
e32de7ba | 14980 | if (this->traverse_vals(traverse) == TRAVERSE_EXIT) |
e440a328 | 14981 | return TRAVERSE_EXIT; |
14982 | if (Type::traverse(this->type_, traverse) == TRAVERSE_EXIT) | |
14983 | return TRAVERSE_EXIT; | |
14984 | return TRAVERSE_CONTINUE; | |
14985 | } | |
14986 | ||
14987 | // Return whether this is a constant initializer. | |
14988 | ||
14989 | bool | |
14990 | Array_construction_expression::is_constant_array() const | |
14991 | { | |
e32de7ba | 14992 | if (this->vals() == NULL) |
e440a328 | 14993 | return true; |
14994 | ||
14995 | // There are no constant constructors for interfaces. | |
14996 | if (this->type_->array_type()->element_type()->interface_type() != NULL) | |
14997 | return false; | |
14998 | ||
e32de7ba | 14999 | for (Expression_list::const_iterator pv = this->vals()->begin(); |
15000 | pv != this->vals()->end(); | |
e440a328 | 15001 | ++pv) |
15002 | { | |
15003 | if (*pv != NULL | |
15004 | && !(*pv)->is_constant() | |
15005 | && (!(*pv)->is_composite_literal() | |
15006 | || (*pv)->is_nonconstant_composite_literal())) | |
15007 | return false; | |
15008 | } | |
15009 | return true; | |
15010 | } | |
15011 | ||
d2199dbc | 15012 | // Return whether this is a zero value. |
15013 | ||
15014 | bool | |
15015 | Array_construction_expression::do_is_zero_value() const | |
15016 | { | |
15017 | if (this->vals() == NULL) | |
15018 | return true; | |
15019 | ||
15020 | // Interface conversion may cause a zero value being converted | |
15021 | // to a non-zero value, like interface{}(0). Be conservative. | |
15022 | if (this->type_->array_type()->element_type()->interface_type() != NULL) | |
15023 | return false; | |
15024 | ||
15025 | for (Expression_list::const_iterator pv = this->vals()->begin(); | |
15026 | pv != this->vals()->end(); | |
15027 | ++pv) | |
15028 | if (*pv != NULL && !(*pv)->is_zero_value()) | |
15029 | return false; | |
15030 | ||
15031 | return true; | |
15032 | } | |
15033 | ||
3ae06f68 | 15034 | // Return whether this can be used a constant initializer. |
f9ca30f9 | 15035 | |
15036 | bool | |
3ae06f68 | 15037 | Array_construction_expression::do_is_static_initializer() const |
f9ca30f9 | 15038 | { |
e32de7ba | 15039 | if (this->vals() == NULL) |
f9ca30f9 | 15040 | return true; |
de048538 | 15041 | |
15042 | // There are no constant constructors for interfaces. | |
15043 | if (this->type_->array_type()->element_type()->interface_type() != NULL) | |
15044 | return false; | |
15045 | ||
e32de7ba | 15046 | for (Expression_list::const_iterator pv = this->vals()->begin(); |
15047 | pv != this->vals()->end(); | |
f9ca30f9 | 15048 | ++pv) |
15049 | { | |
3ae06f68 | 15050 | if (*pv != NULL && !(*pv)->is_static_initializer()) |
f9ca30f9 | 15051 | return false; |
15052 | } | |
15053 | return true; | |
15054 | } | |
15055 | ||
e440a328 | 15056 | // Final type determination. |
15057 | ||
15058 | void | |
15059 | Array_construction_expression::do_determine_type(const Type_context*) | |
15060 | { | |
e32de7ba | 15061 | if (this->vals() == NULL) |
e440a328 | 15062 | return; |
15063 | Type_context subcontext(this->type_->array_type()->element_type(), false); | |
e32de7ba | 15064 | for (Expression_list::const_iterator pv = this->vals()->begin(); |
15065 | pv != this->vals()->end(); | |
e440a328 | 15066 | ++pv) |
15067 | { | |
15068 | if (*pv != NULL) | |
15069 | (*pv)->determine_type(&subcontext); | |
15070 | } | |
15071 | } | |
15072 | ||
15073 | // Check types. | |
15074 | ||
15075 | void | |
15076 | Array_construction_expression::do_check_types(Gogo*) | |
15077 | { | |
e32de7ba | 15078 | if (this->vals() == NULL) |
e440a328 | 15079 | return; |
15080 | ||
15081 | Array_type* at = this->type_->array_type(); | |
15082 | int i = 0; | |
15083 | Type* element_type = at->element_type(); | |
e32de7ba | 15084 | for (Expression_list::const_iterator pv = this->vals()->begin(); |
15085 | pv != this->vals()->end(); | |
e440a328 | 15086 | ++pv, ++i) |
15087 | { | |
15088 | if (*pv != NULL | |
15089 | && !Type::are_assignable(element_type, (*pv)->type(), NULL)) | |
15090 | { | |
631d5788 | 15091 | go_error_at((*pv)->location(), |
15092 | "incompatible type for element %d in composite literal", | |
15093 | i + 1); | |
e440a328 | 15094 | this->set_is_error(); |
15095 | } | |
15096 | } | |
e440a328 | 15097 | } |
15098 | ||
8ba8cc87 | 15099 | // Flatten an array construction expression. Store the values into |
15100 | // temporaries in case they need interface conversion. | |
15101 | ||
15102 | Expression* | |
15103 | Array_construction_expression::do_flatten(Gogo*, Named_object*, | |
15104 | Statement_inserter* inserter) | |
15105 | { | |
e32de7ba | 15106 | if (this->vals() == NULL) |
8ba8cc87 | 15107 | return this; |
15108 | ||
15109 | // If this is a constant array, we don't need temporaries. | |
de048538 | 15110 | if (this->is_constant_array() || this->is_static_initializer()) |
8ba8cc87 | 15111 | return this; |
15112 | ||
15113 | Location loc = this->location(); | |
e32de7ba | 15114 | for (Expression_list::iterator pv = this->vals()->begin(); |
15115 | pv != this->vals()->end(); | |
8ba8cc87 | 15116 | ++pv) |
15117 | { | |
15118 | if (*pv != NULL) | |
15119 | { | |
5bf8be8b | 15120 | if ((*pv)->is_error_expression() || (*pv)->type()->is_error_type()) |
15121 | { | |
15122 | go_assert(saw_errors()); | |
15123 | return Expression::make_error(loc); | |
15124 | } | |
8ba8cc87 | 15125 | if (!(*pv)->is_variable()) |
15126 | { | |
15127 | Temporary_statement* temp = | |
15128 | Statement::make_temporary(NULL, *pv, loc); | |
15129 | inserter->insert(temp); | |
15130 | *pv = Expression::make_temporary_reference(temp, loc); | |
15131 | } | |
15132 | } | |
15133 | } | |
15134 | return this; | |
15135 | } | |
15136 | ||
e007b1eb | 15137 | // Make implicit type conversions explicit. |
15138 | ||
15139 | void | |
15140 | Array_construction_expression::do_add_conversions() | |
15141 | { | |
15142 | if (this->vals() == NULL) | |
15143 | return; | |
15144 | ||
15145 | Type* et = this->type_->array_type()->element_type(); | |
15146 | if (et->interface_type() == NULL) | |
15147 | return; | |
15148 | ||
15149 | Location loc = this->location(); | |
15150 | for (Expression_list::iterator pv = this->vals()->begin(); | |
15151 | pv != this->vals()->end(); | |
15152 | ++pv) | |
15153 | if (!Type::are_identical(et, (*pv)->type(), 0, NULL)) | |
15154 | *pv = Expression::make_cast(et, *pv, loc); | |
15155 | } | |
15156 | ||
2c809f8f | 15157 | // Get a constructor expression for the array values. |
e440a328 | 15158 | |
2c809f8f | 15159 | Bexpression* |
15160 | Array_construction_expression::get_constructor(Translate_context* context, | |
15161 | Btype* array_btype) | |
e440a328 | 15162 | { |
e440a328 | 15163 | Type* element_type = this->type_->array_type()->element_type(); |
2c809f8f | 15164 | |
15165 | std::vector<unsigned long> indexes; | |
15166 | std::vector<Bexpression*> vals; | |
15167 | Gogo* gogo = context->gogo(); | |
e32de7ba | 15168 | if (this->vals() != NULL) |
e440a328 | 15169 | { |
15170 | size_t i = 0; | |
ffe743ca | 15171 | std::vector<unsigned long>::const_iterator pi; |
15172 | if (this->indexes_ != NULL) | |
15173 | pi = this->indexes_->begin(); | |
e32de7ba | 15174 | for (Expression_list::const_iterator pv = this->vals()->begin(); |
15175 | pv != this->vals()->end(); | |
e440a328 | 15176 | ++pv, ++i) |
15177 | { | |
ffe743ca | 15178 | if (this->indexes_ != NULL) |
15179 | go_assert(pi != this->indexes_->end()); | |
ffe743ca | 15180 | |
15181 | if (this->indexes_ == NULL) | |
2c809f8f | 15182 | indexes.push_back(i); |
ffe743ca | 15183 | else |
2c809f8f | 15184 | indexes.push_back(*pi); |
e440a328 | 15185 | if (*pv == NULL) |
63697958 | 15186 | { |
63697958 | 15187 | Btype* ebtype = element_type->get_backend(gogo); |
15188 | Bexpression *zv = gogo->backend()->zero_expression(ebtype); | |
2c809f8f | 15189 | vals.push_back(zv); |
63697958 | 15190 | } |
e440a328 | 15191 | else |
15192 | { | |
2c809f8f | 15193 | Expression* val_expr = |
15194 | Expression::convert_for_assignment(gogo, element_type, *pv, | |
15195 | this->location()); | |
ea664253 | 15196 | vals.push_back(val_expr->get_backend(context)); |
e440a328 | 15197 | } |
ffe743ca | 15198 | if (this->indexes_ != NULL) |
15199 | ++pi; | |
e440a328 | 15200 | } |
ffe743ca | 15201 | if (this->indexes_ != NULL) |
15202 | go_assert(pi == this->indexes_->end()); | |
e440a328 | 15203 | } |
2c809f8f | 15204 | return gogo->backend()->array_constructor_expression(array_btype, indexes, |
15205 | vals, this->location()); | |
e440a328 | 15206 | } |
15207 | ||
15208 | // Export an array construction. | |
15209 | ||
15210 | void | |
548be246 | 15211 | Array_construction_expression::do_export(Export_function_body* efb) const |
e440a328 | 15212 | { |
204d4af4 | 15213 | efb->write_c_string("$convert("); |
548be246 | 15214 | efb->write_type(this->type_); |
e32de7ba | 15215 | if (this->vals() != NULL) |
e440a328 | 15216 | { |
ffe743ca | 15217 | std::vector<unsigned long>::const_iterator pi; |
15218 | if (this->indexes_ != NULL) | |
15219 | pi = this->indexes_->begin(); | |
e32de7ba | 15220 | for (Expression_list::const_iterator pv = this->vals()->begin(); |
15221 | pv != this->vals()->end(); | |
e440a328 | 15222 | ++pv) |
15223 | { | |
548be246 | 15224 | efb->write_c_string(", "); |
ffe743ca | 15225 | |
15226 | if (this->indexes_ != NULL) | |
15227 | { | |
15228 | char buf[100]; | |
15229 | snprintf(buf, sizeof buf, "%lu", *pi); | |
548be246 | 15230 | efb->write_c_string(buf); |
15231 | efb->write_c_string(":"); | |
ffe743ca | 15232 | } |
15233 | ||
e440a328 | 15234 | if (*pv != NULL) |
548be246 | 15235 | (*pv)->export_expression(efb); |
ffe743ca | 15236 | |
15237 | if (this->indexes_ != NULL) | |
15238 | ++pi; | |
e440a328 | 15239 | } |
15240 | } | |
548be246 | 15241 | efb->write_c_string(")"); |
e440a328 | 15242 | } |
15243 | ||
0e9a2e72 | 15244 | // Dump ast representation of an array construction expression. |
d751bb78 | 15245 | |
15246 | void | |
15247 | Array_construction_expression::do_dump_expression( | |
15248 | Ast_dump_context* ast_dump_context) const | |
15249 | { | |
ffe743ca | 15250 | Expression* length = this->type_->array_type()->length(); |
8b1c301d | 15251 | |
15252 | ast_dump_context->ostream() << "[" ; | |
15253 | if (length != NULL) | |
15254 | { | |
15255 | ast_dump_context->dump_expression(length); | |
15256 | } | |
15257 | ast_dump_context->ostream() << "]" ; | |
d751bb78 | 15258 | ast_dump_context->dump_type(this->type_); |
0e9a2e72 | 15259 | this->dump_slice_storage_expression(ast_dump_context); |
d751bb78 | 15260 | ast_dump_context->ostream() << "{" ; |
ffe743ca | 15261 | if (this->indexes_ == NULL) |
e32de7ba | 15262 | ast_dump_context->dump_expression_list(this->vals()); |
ffe743ca | 15263 | else |
15264 | { | |
e32de7ba | 15265 | Expression_list::const_iterator pv = this->vals()->begin(); |
ffe743ca | 15266 | for (std::vector<unsigned long>::const_iterator pi = |
15267 | this->indexes_->begin(); | |
15268 | pi != this->indexes_->end(); | |
15269 | ++pi, ++pv) | |
15270 | { | |
15271 | if (pi != this->indexes_->begin()) | |
15272 | ast_dump_context->ostream() << ", "; | |
15273 | ast_dump_context->ostream() << *pi << ':'; | |
15274 | ast_dump_context->dump_expression(*pv); | |
15275 | } | |
15276 | } | |
d751bb78 | 15277 | ast_dump_context->ostream() << "}" ; |
15278 | ||
15279 | } | |
15280 | ||
da244e59 | 15281 | // Class Fixed_array_construction_expression. |
e440a328 | 15282 | |
da244e59 | 15283 | Fixed_array_construction_expression::Fixed_array_construction_expression( |
15284 | Type* type, const std::vector<unsigned long>* indexes, | |
15285 | Expression_list* vals, Location location) | |
15286 | : Array_construction_expression(EXPRESSION_FIXED_ARRAY_CONSTRUCTION, | |
15287 | type, indexes, vals, location) | |
15288 | { go_assert(type->array_type() != NULL && !type->is_slice_type()); } | |
e440a328 | 15289 | |
de590a61 | 15290 | |
15291 | // Copy. | |
15292 | ||
15293 | Expression* | |
15294 | Fixed_array_construction_expression::do_copy() | |
15295 | { | |
15296 | Type* t = this->type()->copy_expressions(); | |
15297 | return new Fixed_array_construction_expression(t, this->indexes(), | |
15298 | (this->vals() == NULL | |
15299 | ? NULL | |
15300 | : this->vals()->copy()), | |
15301 | this->location()); | |
15302 | } | |
15303 | ||
ea664253 | 15304 | // Return the backend representation for constructing a fixed array. |
e440a328 | 15305 | |
ea664253 | 15306 | Bexpression* |
15307 | Fixed_array_construction_expression::do_get_backend(Translate_context* context) | |
e440a328 | 15308 | { |
9f0e0513 | 15309 | Type* type = this->type(); |
15310 | Btype* btype = type->get_backend(context->gogo()); | |
ea664253 | 15311 | return this->get_constructor(context, btype); |
e440a328 | 15312 | } |
15313 | ||
76f85fd6 | 15314 | Expression* |
15315 | Expression::make_array_composite_literal(Type* type, Expression_list* vals, | |
15316 | Location location) | |
15317 | { | |
15318 | go_assert(type->array_type() != NULL && !type->is_slice_type()); | |
15319 | return new Fixed_array_construction_expression(type, NULL, vals, location); | |
15320 | } | |
15321 | ||
da244e59 | 15322 | // Class Slice_construction_expression. |
e440a328 | 15323 | |
da244e59 | 15324 | Slice_construction_expression::Slice_construction_expression( |
15325 | Type* type, const std::vector<unsigned long>* indexes, | |
15326 | Expression_list* vals, Location location) | |
15327 | : Array_construction_expression(EXPRESSION_SLICE_CONSTRUCTION, | |
15328 | type, indexes, vals, location), | |
0e9a2e72 | 15329 | valtype_(NULL), array_val_(NULL), slice_storage_(NULL), |
15330 | storage_escapes_(true) | |
e440a328 | 15331 | { |
da244e59 | 15332 | go_assert(type->is_slice_type()); |
23d77f91 | 15333 | |
da244e59 | 15334 | unsigned long lenval; |
15335 | Expression* length; | |
15336 | if (vals == NULL || vals->empty()) | |
15337 | lenval = 0; | |
15338 | else | |
15339 | { | |
15340 | if (this->indexes() == NULL) | |
15341 | lenval = vals->size(); | |
15342 | else | |
15343 | lenval = indexes->back() + 1; | |
15344 | } | |
15345 | Type* int_type = Type::lookup_integer_type("int"); | |
15346 | length = Expression::make_integer_ul(lenval, int_type, location); | |
15347 | Type* element_type = type->array_type()->element_type(); | |
6bf4793c | 15348 | Array_type* array_type = Type::make_array_type(element_type, length); |
15349 | array_type->set_is_array_incomparable(); | |
15350 | this->valtype_ = array_type; | |
da244e59 | 15351 | } |
e440a328 | 15352 | |
23d77f91 | 15353 | // Traversal. |
15354 | ||
15355 | int | |
15356 | Slice_construction_expression::do_traverse(Traverse* traverse) | |
15357 | { | |
15358 | if (this->Array_construction_expression::do_traverse(traverse) | |
15359 | == TRAVERSE_EXIT) | |
15360 | return TRAVERSE_EXIT; | |
15361 | if (Type::traverse(this->valtype_, traverse) == TRAVERSE_EXIT) | |
15362 | return TRAVERSE_EXIT; | |
0e9a2e72 | 15363 | if (this->array_val_ != NULL |
15364 | && Expression::traverse(&this->array_val_, traverse) == TRAVERSE_EXIT) | |
15365 | return TRAVERSE_EXIT; | |
15366 | if (this->slice_storage_ != NULL | |
15367 | && Expression::traverse(&this->slice_storage_, traverse) == TRAVERSE_EXIT) | |
15368 | return TRAVERSE_EXIT; | |
23d77f91 | 15369 | return TRAVERSE_CONTINUE; |
15370 | } | |
15371 | ||
0e9a2e72 | 15372 | // Helper routine to create fixed array value underlying the slice literal. |
15373 | // May be called during flattening, or later during do_get_backend(). | |
e440a328 | 15374 | |
0e9a2e72 | 15375 | Expression* |
15376 | Slice_construction_expression::create_array_val() | |
e440a328 | 15377 | { |
f9c68f17 | 15378 | Array_type* array_type = this->type()->array_type(); |
15379 | if (array_type == NULL) | |
15380 | { | |
c484d925 | 15381 | go_assert(this->type()->is_error()); |
0e9a2e72 | 15382 | return NULL; |
f9c68f17 | 15383 | } |
15384 | ||
f23d7786 | 15385 | Location loc = this->location(); |
23d77f91 | 15386 | go_assert(this->valtype_ != NULL); |
3d60812e | 15387 | |
f23d7786 | 15388 | Expression_list* vals = this->vals(); |
0e9a2e72 | 15389 | return new Fixed_array_construction_expression( |
15390 | this->valtype_, this->indexes(), vals, loc); | |
15391 | } | |
15392 | ||
15393 | // If we're previous established that the slice storage does not | |
15394 | // escape, then create a separate array temp val here for it. We | |
15395 | // need to do this as part of flattening so as to be able to insert | |
15396 | // the new temp statement. | |
15397 | ||
15398 | Expression* | |
15399 | Slice_construction_expression::do_flatten(Gogo* gogo, Named_object* no, | |
15400 | Statement_inserter* inserter) | |
15401 | { | |
15402 | if (this->type()->array_type() == NULL) | |
15403 | return NULL; | |
15404 | ||
15405 | // Base class flattening first | |
15406 | this->Array_construction_expression::do_flatten(gogo, no, inserter); | |
15407 | ||
a1bbc2c3 | 15408 | // Create a stack-allocated storage temp if storage won't escape |
03118c21 | 15409 | if (!this->storage_escapes_ |
15410 | && this->slice_storage_ == NULL | |
15411 | && this->element_count() > 0) | |
0e9a2e72 | 15412 | { |
15413 | Location loc = this->location(); | |
03118c21 | 15414 | this->array_val_ = this->create_array_val(); |
0e9a2e72 | 15415 | go_assert(this->array_val_); |
15416 | Temporary_statement* temp = | |
15417 | Statement::make_temporary(this->valtype_, this->array_val_, loc); | |
15418 | inserter->insert(temp); | |
15419 | this->slice_storage_ = Expression::make_temporary_reference(temp, loc); | |
15420 | } | |
15421 | return this; | |
15422 | } | |
15423 | ||
15424 | // When dumping a slice construction expression that has an explicit | |
15425 | // storeage temp, emit the temp here (if we don't do this the storage | |
15426 | // temp appears unused in the AST dump). | |
15427 | ||
15428 | void | |
15429 | Slice_construction_expression:: | |
15430 | dump_slice_storage_expression(Ast_dump_context* ast_dump_context) const | |
15431 | { | |
15432 | if (this->slice_storage_ == NULL) | |
15433 | return; | |
15434 | ast_dump_context->ostream() << "storage=" ; | |
15435 | ast_dump_context->dump_expression(this->slice_storage_); | |
15436 | } | |
15437 | ||
de590a61 | 15438 | // Copy. |
15439 | ||
15440 | Expression* | |
15441 | Slice_construction_expression::do_copy() | |
15442 | { | |
15443 | return new Slice_construction_expression(this->type()->copy_expressions(), | |
15444 | this->indexes(), | |
15445 | (this->vals() == NULL | |
15446 | ? NULL | |
15447 | : this->vals()->copy()), | |
15448 | this->location()); | |
15449 | } | |
15450 | ||
0e9a2e72 | 15451 | // Return the backend representation for constructing a slice. |
15452 | ||
15453 | Bexpression* | |
15454 | Slice_construction_expression::do_get_backend(Translate_context* context) | |
15455 | { | |
15456 | if (this->array_val_ == NULL) | |
03118c21 | 15457 | this->array_val_ = this->create_array_val(); |
0e9a2e72 | 15458 | if (this->array_val_ == NULL) |
15459 | { | |
15460 | go_assert(this->type()->is_error()); | |
15461 | return context->backend()->error_expression(); | |
15462 | } | |
15463 | ||
15464 | Location loc = this->location(); | |
e440a328 | 15465 | |
3ae06f68 | 15466 | bool is_static_initializer = this->array_val_->is_static_initializer(); |
d8829beb | 15467 | |
15468 | // We have to copy the initial values into heap memory if we are in | |
3ae06f68 | 15469 | // a function or if the values are not constants. |
15470 | bool copy_to_heap = context->function() != NULL || !is_static_initializer; | |
e440a328 | 15471 | |
f23d7786 | 15472 | Expression* space; |
0e9a2e72 | 15473 | |
15474 | if (this->slice_storage_ != NULL) | |
15475 | { | |
15476 | go_assert(!this->storage_escapes_); | |
15477 | space = Expression::make_unary(OPERATOR_AND, this->slice_storage_, loc); | |
15478 | } | |
15479 | else if (!copy_to_heap) | |
e440a328 | 15480 | { |
f23d7786 | 15481 | // The initializer will only run once. |
0e9a2e72 | 15482 | space = Expression::make_unary(OPERATOR_AND, this->array_val_, loc); |
f23d7786 | 15483 | space->unary_expression()->set_is_slice_init(); |
e440a328 | 15484 | } |
15485 | else | |
45ff893b | 15486 | { |
5973ede0 | 15487 | go_assert(this->storage_escapes_ || this->element_count() == 0); |
0e9a2e72 | 15488 | space = Expression::make_heap_expression(this->array_val_, loc); |
45ff893b | 15489 | } |
d633d0fb | 15490 | Array_type* at = this->valtype_->array_type(); |
15491 | Type* et = at->element_type(); | |
15492 | space = Expression::make_unsafe_cast(Type::make_pointer_type(et), | |
15493 | space, loc); | |
e440a328 | 15494 | |
2c809f8f | 15495 | // Build a constructor for the slice. |
d633d0fb | 15496 | Expression* len = at->length(); |
f23d7786 | 15497 | Expression* slice_val = |
15498 | Expression::make_slice_value(this->type(), space, len, len, loc); | |
ea664253 | 15499 | return slice_val->get_backend(context); |
e440a328 | 15500 | } |
15501 | ||
15502 | // Make a slice composite literal. This is used by the type | |
15503 | // descriptor code. | |
15504 | ||
0e9a2e72 | 15505 | Slice_construction_expression* |
e440a328 | 15506 | Expression::make_slice_composite_literal(Type* type, Expression_list* vals, |
b13c66cd | 15507 | Location location) |
e440a328 | 15508 | { |
411eb89e | 15509 | go_assert(type->is_slice_type()); |
2c809f8f | 15510 | return new Slice_construction_expression(type, NULL, vals, location); |
e440a328 | 15511 | } |
15512 | ||
da244e59 | 15513 | // Class Map_construction_expression. |
e440a328 | 15514 | |
15515 | // Traversal. | |
15516 | ||
15517 | int | |
15518 | Map_construction_expression::do_traverse(Traverse* traverse) | |
15519 | { | |
15520 | if (this->vals_ != NULL | |
15521 | && this->vals_->traverse(traverse) == TRAVERSE_EXIT) | |
15522 | return TRAVERSE_EXIT; | |
15523 | if (Type::traverse(this->type_, traverse) == TRAVERSE_EXIT) | |
15524 | return TRAVERSE_EXIT; | |
15525 | return TRAVERSE_CONTINUE; | |
15526 | } | |
15527 | ||
2c809f8f | 15528 | // Flatten constructor initializer into a temporary variable since |
15529 | // we need to take its address for __go_construct_map. | |
15530 | ||
15531 | Expression* | |
15532 | Map_construction_expression::do_flatten(Gogo* gogo, Named_object*, | |
15533 | Statement_inserter* inserter) | |
15534 | { | |
15535 | if (!this->is_error_expression() | |
15536 | && this->vals_ != NULL | |
15537 | && !this->vals_->empty() | |
15538 | && this->constructor_temp_ == NULL) | |
15539 | { | |
15540 | Map_type* mt = this->type_->map_type(); | |
15541 | Type* key_type = mt->key_type(); | |
15542 | Type* val_type = mt->val_type(); | |
15543 | this->element_type_ = Type::make_builtin_struct_type(2, | |
15544 | "__key", key_type, | |
15545 | "__val", val_type); | |
15546 | ||
15547 | Expression_list* value_pairs = new Expression_list(); | |
15548 | Location loc = this->location(); | |
15549 | ||
15550 | size_t i = 0; | |
15551 | for (Expression_list::const_iterator pv = this->vals_->begin(); | |
15552 | pv != this->vals_->end(); | |
15553 | ++pv, ++i) | |
15554 | { | |
15555 | Expression_list* key_value_pair = new Expression_list(); | |
91c0fd76 | 15556 | Expression* key = *pv; |
5bf8be8b | 15557 | if (key->is_error_expression() || key->type()->is_error_type()) |
15558 | { | |
15559 | go_assert(saw_errors()); | |
15560 | return Expression::make_error(loc); | |
15561 | } | |
91c0fd76 | 15562 | if (key->type()->interface_type() != NULL && !key->is_variable()) |
15563 | { | |
15564 | Temporary_statement* temp = | |
15565 | Statement::make_temporary(NULL, key, loc); | |
15566 | inserter->insert(temp); | |
15567 | key = Expression::make_temporary_reference(temp, loc); | |
15568 | } | |
15569 | key = Expression::convert_for_assignment(gogo, key_type, key, loc); | |
2c809f8f | 15570 | |
15571 | ++pv; | |
91c0fd76 | 15572 | Expression* val = *pv; |
5bf8be8b | 15573 | if (val->is_error_expression() || val->type()->is_error_type()) |
15574 | { | |
15575 | go_assert(saw_errors()); | |
15576 | return Expression::make_error(loc); | |
15577 | } | |
91c0fd76 | 15578 | if (val->type()->interface_type() != NULL && !val->is_variable()) |
15579 | { | |
15580 | Temporary_statement* temp = | |
15581 | Statement::make_temporary(NULL, val, loc); | |
15582 | inserter->insert(temp); | |
15583 | val = Expression::make_temporary_reference(temp, loc); | |
15584 | } | |
15585 | val = Expression::convert_for_assignment(gogo, val_type, val, loc); | |
2c809f8f | 15586 | |
15587 | key_value_pair->push_back(key); | |
15588 | key_value_pair->push_back(val); | |
15589 | value_pairs->push_back( | |
15590 | Expression::make_struct_composite_literal(this->element_type_, | |
15591 | key_value_pair, loc)); | |
15592 | } | |
15593 | ||
e67508fa | 15594 | Expression* element_count = Expression::make_integer_ul(i, NULL, loc); |
6bf4793c | 15595 | Array_type* ctor_type = |
2c809f8f | 15596 | Type::make_array_type(this->element_type_, element_count); |
6bf4793c | 15597 | ctor_type->set_is_array_incomparable(); |
2c809f8f | 15598 | Expression* constructor = |
15599 | new Fixed_array_construction_expression(ctor_type, NULL, | |
15600 | value_pairs, loc); | |
15601 | ||
15602 | this->constructor_temp_ = | |
15603 | Statement::make_temporary(NULL, constructor, loc); | |
15604 | constructor->issue_nil_check(); | |
15605 | this->constructor_temp_->set_is_address_taken(); | |
15606 | inserter->insert(this->constructor_temp_); | |
15607 | } | |
15608 | ||
15609 | return this; | |
15610 | } | |
15611 | ||
e440a328 | 15612 | // Final type determination. |
15613 | ||
15614 | void | |
15615 | Map_construction_expression::do_determine_type(const Type_context*) | |
15616 | { | |
15617 | if (this->vals_ == NULL) | |
15618 | return; | |
15619 | ||
15620 | Map_type* mt = this->type_->map_type(); | |
15621 | Type_context key_context(mt->key_type(), false); | |
15622 | Type_context val_context(mt->val_type(), false); | |
15623 | for (Expression_list::const_iterator pv = this->vals_->begin(); | |
15624 | pv != this->vals_->end(); | |
15625 | ++pv) | |
15626 | { | |
15627 | (*pv)->determine_type(&key_context); | |
15628 | ++pv; | |
15629 | (*pv)->determine_type(&val_context); | |
15630 | } | |
15631 | } | |
15632 | ||
15633 | // Check types. | |
15634 | ||
15635 | void | |
15636 | Map_construction_expression::do_check_types(Gogo*) | |
15637 | { | |
15638 | if (this->vals_ == NULL) | |
15639 | return; | |
15640 | ||
15641 | Map_type* mt = this->type_->map_type(); | |
15642 | int i = 0; | |
15643 | Type* key_type = mt->key_type(); | |
15644 | Type* val_type = mt->val_type(); | |
15645 | for (Expression_list::const_iterator pv = this->vals_->begin(); | |
15646 | pv != this->vals_->end(); | |
15647 | ++pv, ++i) | |
15648 | { | |
15649 | if (!Type::are_assignable(key_type, (*pv)->type(), NULL)) | |
15650 | { | |
631d5788 | 15651 | go_error_at((*pv)->location(), |
15652 | "incompatible type for element %d key in map construction", | |
15653 | i + 1); | |
e440a328 | 15654 | this->set_is_error(); |
15655 | } | |
15656 | ++pv; | |
15657 | if (!Type::are_assignable(val_type, (*pv)->type(), NULL)) | |
15658 | { | |
631d5788 | 15659 | go_error_at((*pv)->location(), |
15660 | ("incompatible type for element %d value " | |
15661 | "in map construction"), | |
e440a328 | 15662 | i + 1); |
15663 | this->set_is_error(); | |
15664 | } | |
15665 | } | |
15666 | } | |
15667 | ||
de590a61 | 15668 | // Copy. |
15669 | ||
15670 | Expression* | |
15671 | Map_construction_expression::do_copy() | |
15672 | { | |
15673 | return new Map_construction_expression(this->type_->copy_expressions(), | |
15674 | (this->vals_ == NULL | |
15675 | ? NULL | |
15676 | : this->vals_->copy()), | |
15677 | this->location()); | |
15678 | } | |
15679 | ||
e007b1eb | 15680 | // Make implicit type conversions explicit. |
15681 | ||
15682 | void | |
15683 | Map_construction_expression::do_add_conversions() | |
15684 | { | |
15685 | if (this->vals_ == NULL || this->vals_->empty()) | |
15686 | return; | |
15687 | ||
15688 | Map_type* mt = this->type_->map_type(); | |
15689 | Type* kt = mt->key_type(); | |
15690 | Type* vt = mt->val_type(); | |
15691 | bool key_is_interface = (kt->interface_type() != NULL); | |
15692 | bool val_is_interface = (vt->interface_type() != NULL); | |
15693 | if (!key_is_interface && !val_is_interface) | |
15694 | return; | |
15695 | ||
15696 | Location loc = this->location(); | |
15697 | for (Expression_list::iterator pv = this->vals_->begin(); | |
15698 | pv != this->vals_->end(); | |
15699 | ++pv) | |
15700 | { | |
15701 | if (key_is_interface && | |
15702 | !Type::are_identical(kt, (*pv)->type(), 0, NULL)) | |
15703 | *pv = Expression::make_cast(kt, *pv, loc); | |
15704 | ++pv; | |
15705 | if (val_is_interface && | |
15706 | !Type::are_identical(vt, (*pv)->type(), 0, NULL)) | |
15707 | *pv = Expression::make_cast(vt, *pv, loc); | |
15708 | } | |
15709 | } | |
15710 | ||
ea664253 | 15711 | // Return the backend representation for constructing a map. |
e440a328 | 15712 | |
ea664253 | 15713 | Bexpression* |
15714 | Map_construction_expression::do_get_backend(Translate_context* context) | |
e440a328 | 15715 | { |
2c809f8f | 15716 | if (this->is_error_expression()) |
ea664253 | 15717 | return context->backend()->error_expression(); |
2c809f8f | 15718 | Location loc = this->location(); |
e440a328 | 15719 | |
e440a328 | 15720 | size_t i = 0; |
2c809f8f | 15721 | Expression* ventries; |
e440a328 | 15722 | if (this->vals_ == NULL || this->vals_->empty()) |
2c809f8f | 15723 | ventries = Expression::make_nil(loc); |
e440a328 | 15724 | else |
15725 | { | |
2c809f8f | 15726 | go_assert(this->constructor_temp_ != NULL); |
15727 | i = this->vals_->size() / 2; | |
e440a328 | 15728 | |
2c809f8f | 15729 | Expression* ctor_ref = |
15730 | Expression::make_temporary_reference(this->constructor_temp_, loc); | |
15731 | ventries = Expression::make_unary(OPERATOR_AND, ctor_ref, loc); | |
15732 | } | |
e440a328 | 15733 | |
2c809f8f | 15734 | Map_type* mt = this->type_->map_type(); |
15735 | if (this->element_type_ == NULL) | |
15736 | this->element_type_ = | |
15737 | Type::make_builtin_struct_type(2, | |
15738 | "__key", mt->key_type(), | |
15739 | "__val", mt->val_type()); | |
0d5530d9 | 15740 | Expression* descriptor = Expression::make_type_descriptor(mt, loc); |
2c809f8f | 15741 | |
15742 | Type* uintptr_t = Type::lookup_integer_type("uintptr"); | |
e67508fa | 15743 | Expression* count = Expression::make_integer_ul(i, uintptr_t, loc); |
2c809f8f | 15744 | |
15745 | Expression* entry_size = | |
15746 | Expression::make_type_info(this->element_type_, TYPE_INFO_SIZE); | |
15747 | ||
15748 | unsigned int field_index; | |
15749 | const Struct_field* valfield = | |
15750 | this->element_type_->find_local_field("__val", &field_index); | |
15751 | Expression* val_offset = | |
15752 | Expression::make_struct_field_offset(this->element_type_, valfield); | |
2c809f8f | 15753 | |
15754 | Expression* map_ctor = | |
0d5530d9 | 15755 | Runtime::make_call(Runtime::CONSTRUCT_MAP, loc, 5, descriptor, count, |
15756 | entry_size, val_offset, ventries); | |
ea664253 | 15757 | return map_ctor->get_backend(context); |
2c809f8f | 15758 | } |
e440a328 | 15759 | |
2c809f8f | 15760 | // Export an array construction. |
e440a328 | 15761 | |
2c809f8f | 15762 | void |
548be246 | 15763 | Map_construction_expression::do_export(Export_function_body* efb) const |
2c809f8f | 15764 | { |
204d4af4 | 15765 | efb->write_c_string("$convert("); |
548be246 | 15766 | efb->write_type(this->type_); |
2c809f8f | 15767 | for (Expression_list::const_iterator pv = this->vals_->begin(); |
15768 | pv != this->vals_->end(); | |
15769 | ++pv) | |
15770 | { | |
548be246 | 15771 | efb->write_c_string(", "); |
15772 | (*pv)->export_expression(efb); | |
2c809f8f | 15773 | } |
548be246 | 15774 | efb->write_c_string(")"); |
2c809f8f | 15775 | } |
e440a328 | 15776 | |
2c809f8f | 15777 | // Dump ast representation for a map construction expression. |
d751bb78 | 15778 | |
15779 | void | |
15780 | Map_construction_expression::do_dump_expression( | |
15781 | Ast_dump_context* ast_dump_context) const | |
15782 | { | |
d751bb78 | 15783 | ast_dump_context->ostream() << "{" ; |
8b1c301d | 15784 | ast_dump_context->dump_expression_list(this->vals_, true); |
d751bb78 | 15785 | ast_dump_context->ostream() << "}"; |
15786 | } | |
15787 | ||
7795ac51 | 15788 | // Class Composite_literal_expression. |
e440a328 | 15789 | |
15790 | // Traversal. | |
15791 | ||
15792 | int | |
15793 | Composite_literal_expression::do_traverse(Traverse* traverse) | |
15794 | { | |
dbffccfc | 15795 | if (Type::traverse(this->type_, traverse) == TRAVERSE_EXIT) |
e440a328 | 15796 | return TRAVERSE_EXIT; |
dbffccfc | 15797 | |
15798 | // If this is a struct composite literal with keys, then the keys | |
15799 | // are field names, not expressions. We don't want to traverse them | |
15800 | // in that case. If we do, we can give an erroneous error "variable | |
15801 | // initializer refers to itself." See bug482.go in the testsuite. | |
15802 | if (this->has_keys_ && this->vals_ != NULL) | |
15803 | { | |
15804 | // The type may not be resolvable at this point. | |
15805 | Type* type = this->type_; | |
a01f2481 | 15806 | |
7795ac51 | 15807 | for (int depth = 0; depth < this->depth_; ++depth) |
a01f2481 | 15808 | { |
15809 | if (type->array_type() != NULL) | |
15810 | type = type->array_type()->element_type(); | |
15811 | else if (type->map_type() != NULL) | |
7795ac51 | 15812 | { |
15813 | if (this->key_path_[depth]) | |
15814 | type = type->map_type()->key_type(); | |
15815 | else | |
15816 | type = type->map_type()->val_type(); | |
15817 | } | |
a01f2481 | 15818 | else |
15819 | { | |
15820 | // This error will be reported during lowering. | |
15821 | return TRAVERSE_CONTINUE; | |
15822 | } | |
15823 | } | |
15824 | ||
dbffccfc | 15825 | while (true) |
15826 | { | |
15827 | if (type->classification() == Type::TYPE_NAMED) | |
15828 | type = type->named_type()->real_type(); | |
15829 | else if (type->classification() == Type::TYPE_FORWARD) | |
15830 | { | |
15831 | Type* t = type->forwarded(); | |
15832 | if (t == type) | |
15833 | break; | |
15834 | type = t; | |
15835 | } | |
15836 | else | |
15837 | break; | |
15838 | } | |
15839 | ||
15840 | if (type->classification() == Type::TYPE_STRUCT) | |
15841 | { | |
15842 | Expression_list::iterator p = this->vals_->begin(); | |
15843 | while (p != this->vals_->end()) | |
15844 | { | |
15845 | // Skip key. | |
15846 | ++p; | |
15847 | go_assert(p != this->vals_->end()); | |
15848 | if (Expression::traverse(&*p, traverse) == TRAVERSE_EXIT) | |
15849 | return TRAVERSE_EXIT; | |
15850 | ++p; | |
15851 | } | |
15852 | return TRAVERSE_CONTINUE; | |
15853 | } | |
15854 | } | |
15855 | ||
15856 | if (this->vals_ != NULL) | |
15857 | return this->vals_->traverse(traverse); | |
15858 | ||
15859 | return TRAVERSE_CONTINUE; | |
e440a328 | 15860 | } |
15861 | ||
15862 | // Lower a generic composite literal into a specific version based on | |
15863 | // the type. | |
15864 | ||
15865 | Expression* | |
ceeb4318 | 15866 | Composite_literal_expression::do_lower(Gogo* gogo, Named_object* function, |
15867 | Statement_inserter* inserter, int) | |
e440a328 | 15868 | { |
15869 | Type* type = this->type_; | |
15870 | ||
7795ac51 | 15871 | for (int depth = 0; depth < this->depth_; ++depth) |
e440a328 | 15872 | { |
67a2ed75 | 15873 | type = type->deref(); |
e440a328 | 15874 | if (type->array_type() != NULL) |
15875 | type = type->array_type()->element_type(); | |
15876 | else if (type->map_type() != NULL) | |
7795ac51 | 15877 | { |
15878 | if (this->key_path_[depth]) | |
15879 | type = type->map_type()->key_type(); | |
15880 | else | |
15881 | type = type->map_type()->val_type(); | |
15882 | } | |
e440a328 | 15883 | else |
15884 | { | |
5c13bd80 | 15885 | if (!type->is_error()) |
631d5788 | 15886 | go_error_at(this->location(), |
15887 | ("may only omit types within composite literals " | |
15888 | "of slice, array, or map type")); | |
e440a328 | 15889 | return Expression::make_error(this->location()); |
15890 | } | |
15891 | } | |
15892 | ||
e00772b3 | 15893 | Type *pt = type->points_to(); |
15894 | bool is_pointer = false; | |
15895 | if (pt != NULL) | |
15896 | { | |
15897 | is_pointer = true; | |
15898 | type = pt; | |
15899 | } | |
15900 | ||
15901 | Expression* ret; | |
5c13bd80 | 15902 | if (type->is_error()) |
e440a328 | 15903 | return Expression::make_error(this->location()); |
15904 | else if (type->struct_type() != NULL) | |
e00772b3 | 15905 | ret = this->lower_struct(gogo, type); |
e440a328 | 15906 | else if (type->array_type() != NULL) |
113ef6a5 | 15907 | ret = this->lower_array(type); |
e440a328 | 15908 | else if (type->map_type() != NULL) |
e00772b3 | 15909 | ret = this->lower_map(gogo, function, inserter, type); |
e440a328 | 15910 | else |
15911 | { | |
631d5788 | 15912 | go_error_at(this->location(), |
15913 | ("expected struct, slice, array, or map type " | |
15914 | "for composite literal")); | |
e440a328 | 15915 | return Expression::make_error(this->location()); |
15916 | } | |
e00772b3 | 15917 | |
15918 | if (is_pointer) | |
2c809f8f | 15919 | ret = Expression::make_heap_expression(ret, this->location()); |
e00772b3 | 15920 | |
15921 | return ret; | |
e440a328 | 15922 | } |
15923 | ||
15924 | // Lower a struct composite literal. | |
15925 | ||
15926 | Expression* | |
81c4b26b | 15927 | Composite_literal_expression::lower_struct(Gogo* gogo, Type* type) |
e440a328 | 15928 | { |
b13c66cd | 15929 | Location location = this->location(); |
e440a328 | 15930 | Struct_type* st = type->struct_type(); |
15931 | if (this->vals_ == NULL || !this->has_keys_) | |
07daa4e7 | 15932 | { |
e6013c28 | 15933 | if (this->vals_ != NULL |
15934 | && !this->vals_->empty() | |
15935 | && type->named_type() != NULL | |
15936 | && type->named_type()->named_object()->package() != NULL) | |
15937 | { | |
15938 | for (Struct_field_list::const_iterator pf = st->fields()->begin(); | |
15939 | pf != st->fields()->end(); | |
15940 | ++pf) | |
07daa4e7 | 15941 | { |
07ba7f26 | 15942 | if (Gogo::is_hidden_name(pf->field_name()) |
15943 | || pf->is_embedded_builtin(gogo)) | |
631d5788 | 15944 | go_error_at(this->location(), |
15945 | "assignment of unexported field %qs in %qs literal", | |
15946 | Gogo::message_name(pf->field_name()).c_str(), | |
15947 | type->named_type()->message_name().c_str()); | |
07daa4e7 | 15948 | } |
15949 | } | |
15950 | ||
15951 | return new Struct_construction_expression(type, this->vals_, location); | |
15952 | } | |
e440a328 | 15953 | |
15954 | size_t field_count = st->field_count(); | |
15955 | std::vector<Expression*> vals(field_count); | |
e32de7ba | 15956 | std::vector<unsigned long>* traverse_order = new(std::vector<unsigned long>); |
e440a328 | 15957 | Expression_list::const_iterator p = this->vals_->begin(); |
62750cd5 | 15958 | Expression* external_expr = NULL; |
15959 | const Named_object* external_no = NULL; | |
e440a328 | 15960 | while (p != this->vals_->end()) |
15961 | { | |
15962 | Expression* name_expr = *p; | |
15963 | ||
15964 | ++p; | |
c484d925 | 15965 | go_assert(p != this->vals_->end()); |
e440a328 | 15966 | Expression* val = *p; |
15967 | ||
15968 | ++p; | |
15969 | ||
15970 | if (name_expr == NULL) | |
15971 | { | |
631d5788 | 15972 | go_error_at(val->location(), |
15973 | "mixture of field and value initializers"); | |
e440a328 | 15974 | return Expression::make_error(location); |
15975 | } | |
15976 | ||
15977 | bool bad_key = false; | |
15978 | std::string name; | |
81c4b26b | 15979 | const Named_object* no = NULL; |
e440a328 | 15980 | switch (name_expr->classification()) |
15981 | { | |
15982 | case EXPRESSION_UNKNOWN_REFERENCE: | |
15983 | name = name_expr->unknown_expression()->name(); | |
7f7ce694 | 15984 | if (type->named_type() != NULL) |
15985 | { | |
15986 | // If the named object found for this field name comes from a | |
15987 | // different package than the struct it is a part of, do not count | |
15988 | // this incorrect lookup as a usage of the object's package. | |
15989 | no = name_expr->unknown_expression()->named_object(); | |
15990 | if (no->package() != NULL | |
15991 | && no->package() != type->named_type()->named_object()->package()) | |
15992 | no->package()->forget_usage(name_expr); | |
15993 | } | |
e440a328 | 15994 | break; |
15995 | ||
15996 | case EXPRESSION_CONST_REFERENCE: | |
81c4b26b | 15997 | no = static_cast<Const_expression*>(name_expr)->named_object(); |
e440a328 | 15998 | break; |
15999 | ||
16000 | case EXPRESSION_TYPE: | |
16001 | { | |
16002 | Type* t = name_expr->type(); | |
16003 | Named_type* nt = t->named_type(); | |
16004 | if (nt == NULL) | |
16005 | bad_key = true; | |
16006 | else | |
81c4b26b | 16007 | no = nt->named_object(); |
e440a328 | 16008 | } |
16009 | break; | |
16010 | ||
16011 | case EXPRESSION_VAR_REFERENCE: | |
81c4b26b | 16012 | no = name_expr->var_expression()->named_object(); |
e440a328 | 16013 | break; |
16014 | ||
b0c09712 | 16015 | case EXPRESSION_ENCLOSED_VAR_REFERENCE: |
16016 | no = name_expr->enclosed_var_expression()->variable(); | |
e440a328 | 16017 | break; |
16018 | ||
b0c09712 | 16019 | case EXPRESSION_FUNC_REFERENCE: |
16020 | no = name_expr->func_expression()->named_object(); | |
e440a328 | 16021 | break; |
16022 | ||
16023 | default: | |
16024 | bad_key = true; | |
16025 | break; | |
16026 | } | |
16027 | if (bad_key) | |
16028 | { | |
631d5788 | 16029 | go_error_at(name_expr->location(), "expected struct field name"); |
e440a328 | 16030 | return Expression::make_error(location); |
16031 | } | |
16032 | ||
81c4b26b | 16033 | if (no != NULL) |
16034 | { | |
62750cd5 | 16035 | if (no->package() != NULL && external_expr == NULL) |
16036 | { | |
16037 | external_expr = name_expr; | |
16038 | external_no = no; | |
16039 | } | |
16040 | ||
81c4b26b | 16041 | name = no->name(); |
16042 | ||
16043 | // A predefined name won't be packed. If it starts with a | |
16044 | // lower case letter we need to check for that case, because | |
2d29d278 | 16045 | // the field name will be packed. FIXME. |
81c4b26b | 16046 | if (!Gogo::is_hidden_name(name) |
16047 | && name[0] >= 'a' | |
16048 | && name[0] <= 'z') | |
16049 | { | |
16050 | Named_object* gno = gogo->lookup_global(name.c_str()); | |
16051 | if (gno == no) | |
16052 | name = gogo->pack_hidden_name(name, false); | |
16053 | } | |
16054 | } | |
16055 | ||
e440a328 | 16056 | unsigned int index; |
16057 | const Struct_field* sf = st->find_local_field(name, &index); | |
16058 | if (sf == NULL) | |
16059 | { | |
631d5788 | 16060 | go_error_at(name_expr->location(), "unknown field %qs in %qs", |
16061 | Gogo::message_name(name).c_str(), | |
16062 | (type->named_type() != NULL | |
16063 | ? type->named_type()->message_name().c_str() | |
16064 | : "unnamed struct")); | |
e440a328 | 16065 | return Expression::make_error(location); |
16066 | } | |
16067 | if (vals[index] != NULL) | |
16068 | { | |
631d5788 | 16069 | go_error_at(name_expr->location(), |
16070 | "duplicate value for field %qs in %qs", | |
16071 | Gogo::message_name(name).c_str(), | |
16072 | (type->named_type() != NULL | |
16073 | ? type->named_type()->message_name().c_str() | |
16074 | : "unnamed struct")); | |
e440a328 | 16075 | return Expression::make_error(location); |
16076 | } | |
16077 | ||
07daa4e7 | 16078 | if (type->named_type() != NULL |
16079 | && type->named_type()->named_object()->package() != NULL | |
07ba7f26 | 16080 | && (Gogo::is_hidden_name(sf->field_name()) |
16081 | || sf->is_embedded_builtin(gogo))) | |
631d5788 | 16082 | go_error_at(name_expr->location(), |
16083 | "assignment of unexported field %qs in %qs literal", | |
16084 | Gogo::message_name(sf->field_name()).c_str(), | |
16085 | type->named_type()->message_name().c_str()); | |
07daa4e7 | 16086 | |
e440a328 | 16087 | vals[index] = val; |
e32de7ba | 16088 | traverse_order->push_back(static_cast<unsigned long>(index)); |
e440a328 | 16089 | } |
16090 | ||
62750cd5 | 16091 | if (!this->all_are_names_) |
16092 | { | |
16093 | // This is a weird case like bug462 in the testsuite. | |
16094 | if (external_expr == NULL) | |
631d5788 | 16095 | go_error_at(this->location(), "unknown field in %qs literal", |
16096 | (type->named_type() != NULL | |
16097 | ? type->named_type()->message_name().c_str() | |
16098 | : "unnamed struct")); | |
62750cd5 | 16099 | else |
631d5788 | 16100 | go_error_at(external_expr->location(), "unknown field %qs in %qs", |
16101 | external_no->message_name().c_str(), | |
16102 | (type->named_type() != NULL | |
16103 | ? type->named_type()->message_name().c_str() | |
16104 | : "unnamed struct")); | |
62750cd5 | 16105 | return Expression::make_error(location); |
16106 | } | |
16107 | ||
e440a328 | 16108 | Expression_list* list = new Expression_list; |
16109 | list->reserve(field_count); | |
16110 | for (size_t i = 0; i < field_count; ++i) | |
16111 | list->push_back(vals[i]); | |
16112 | ||
0c4f5a19 | 16113 | Struct_construction_expression* ret = |
16114 | new Struct_construction_expression(type, list, location); | |
16115 | ret->set_traverse_order(traverse_order); | |
16116 | return ret; | |
e440a328 | 16117 | } |
16118 | ||
e32de7ba | 16119 | // Index/value/traversal-order triple. |
00773463 | 16120 | |
e32de7ba | 16121 | struct IVT_triple { |
16122 | unsigned long index; | |
16123 | unsigned long traversal_order; | |
16124 | Expression* expr; | |
16125 | IVT_triple(unsigned long i, unsigned long to, Expression *e) | |
16126 | : index(i), traversal_order(to), expr(e) { } | |
16127 | bool operator<(const IVT_triple& other) const | |
16128 | { return this->index < other.index; } | |
00773463 | 16129 | }; |
16130 | ||
e440a328 | 16131 | // Lower an array composite literal. |
16132 | ||
16133 | Expression* | |
113ef6a5 | 16134 | Composite_literal_expression::lower_array(Type* type) |
e440a328 | 16135 | { |
b13c66cd | 16136 | Location location = this->location(); |
e440a328 | 16137 | if (this->vals_ == NULL || !this->has_keys_) |
ffe743ca | 16138 | return this->make_array(type, NULL, this->vals_); |
e440a328 | 16139 | |
ffe743ca | 16140 | std::vector<unsigned long>* indexes = new std::vector<unsigned long>; |
16141 | indexes->reserve(this->vals_->size()); | |
00773463 | 16142 | bool indexes_out_of_order = false; |
ffe743ca | 16143 | Expression_list* vals = new Expression_list(); |
16144 | vals->reserve(this->vals_->size()); | |
e440a328 | 16145 | unsigned long index = 0; |
16146 | Expression_list::const_iterator p = this->vals_->begin(); | |
16147 | while (p != this->vals_->end()) | |
16148 | { | |
16149 | Expression* index_expr = *p; | |
16150 | ||
16151 | ++p; | |
c484d925 | 16152 | go_assert(p != this->vals_->end()); |
e440a328 | 16153 | Expression* val = *p; |
16154 | ||
16155 | ++p; | |
16156 | ||
ffe743ca | 16157 | if (index_expr == NULL) |
16158 | { | |
8f2ebee5 | 16159 | if (std::find(indexes->begin(), indexes->end(), index) |
16160 | != indexes->end()) | |
16161 | { | |
16162 | go_error_at(val->location(), | |
16163 | "duplicate value for index %lu", index); | |
16164 | return Expression::make_error(location); | |
16165 | } | |
ffe743ca | 16166 | if (!indexes->empty()) |
16167 | indexes->push_back(index); | |
16168 | } | |
16169 | else | |
e440a328 | 16170 | { |
ffe743ca | 16171 | if (indexes->empty() && !vals->empty()) |
16172 | { | |
16173 | for (size_t i = 0; i < vals->size(); ++i) | |
16174 | indexes->push_back(i); | |
16175 | } | |
16176 | ||
0c77715b | 16177 | Numeric_constant nc; |
16178 | if (!index_expr->numeric_constant_value(&nc)) | |
e440a328 | 16179 | { |
631d5788 | 16180 | go_error_at(index_expr->location(), |
16181 | "index expression is not integer constant"); | |
e440a328 | 16182 | return Expression::make_error(location); |
16183 | } | |
6f6d9955 | 16184 | |
0c77715b | 16185 | switch (nc.to_unsigned_long(&index)) |
e440a328 | 16186 | { |
0c77715b | 16187 | case Numeric_constant::NC_UL_VALID: |
16188 | break; | |
16189 | case Numeric_constant::NC_UL_NOTINT: | |
631d5788 | 16190 | go_error_at(index_expr->location(), |
16191 | "index expression is not integer constant"); | |
0c77715b | 16192 | return Expression::make_error(location); |
16193 | case Numeric_constant::NC_UL_NEGATIVE: | |
631d5788 | 16194 | go_error_at(index_expr->location(), |
16195 | "index expression is negative"); | |
e440a328 | 16196 | return Expression::make_error(location); |
0c77715b | 16197 | case Numeric_constant::NC_UL_BIG: |
631d5788 | 16198 | go_error_at(index_expr->location(), "index value overflow"); |
e440a328 | 16199 | return Expression::make_error(location); |
0c77715b | 16200 | default: |
16201 | go_unreachable(); | |
e440a328 | 16202 | } |
6f6d9955 | 16203 | |
16204 | Named_type* ntype = Type::lookup_integer_type("int"); | |
16205 | Integer_type* inttype = ntype->integer_type(); | |
0c77715b | 16206 | if (sizeof(index) <= static_cast<size_t>(inttype->bits() * 8) |
16207 | && index >> (inttype->bits() - 1) != 0) | |
6f6d9955 | 16208 | { |
631d5788 | 16209 | go_error_at(index_expr->location(), "index value overflow"); |
6f6d9955 | 16210 | return Expression::make_error(location); |
16211 | } | |
16212 | ||
ffe743ca | 16213 | if (std::find(indexes->begin(), indexes->end(), index) |
16214 | != indexes->end()) | |
e440a328 | 16215 | { |
631d5788 | 16216 | go_error_at(index_expr->location(), |
16217 | "duplicate value for index %lu", | |
16218 | index); | |
e440a328 | 16219 | return Expression::make_error(location); |
16220 | } | |
ffe743ca | 16221 | |
00773463 | 16222 | if (!indexes->empty() && index < indexes->back()) |
16223 | indexes_out_of_order = true; | |
16224 | ||
ffe743ca | 16225 | indexes->push_back(index); |
e440a328 | 16226 | } |
16227 | ||
ffe743ca | 16228 | vals->push_back(val); |
16229 | ||
e440a328 | 16230 | ++index; |
16231 | } | |
16232 | ||
ffe743ca | 16233 | if (indexes->empty()) |
16234 | { | |
16235 | delete indexes; | |
16236 | indexes = NULL; | |
16237 | } | |
e440a328 | 16238 | |
e32de7ba | 16239 | std::vector<unsigned long>* traverse_order = NULL; |
00773463 | 16240 | if (indexes_out_of_order) |
16241 | { | |
e32de7ba | 16242 | typedef std::vector<IVT_triple> V; |
00773463 | 16243 | |
16244 | V v; | |
16245 | v.reserve(indexes->size()); | |
16246 | std::vector<unsigned long>::const_iterator pi = indexes->begin(); | |
e32de7ba | 16247 | unsigned long torder = 0; |
00773463 | 16248 | for (Expression_list::const_iterator pe = vals->begin(); |
16249 | pe != vals->end(); | |
e32de7ba | 16250 | ++pe, ++pi, ++torder) |
16251 | v.push_back(IVT_triple(*pi, torder, *pe)); | |
00773463 | 16252 | |
e32de7ba | 16253 | std::sort(v.begin(), v.end()); |
00773463 | 16254 | |
16255 | delete indexes; | |
16256 | delete vals; | |
e32de7ba | 16257 | |
00773463 | 16258 | indexes = new std::vector<unsigned long>(); |
16259 | indexes->reserve(v.size()); | |
16260 | vals = new Expression_list(); | |
16261 | vals->reserve(v.size()); | |
e32de7ba | 16262 | traverse_order = new std::vector<unsigned long>(); |
16263 | traverse_order->reserve(v.size()); | |
00773463 | 16264 | |
16265 | for (V::const_iterator p = v.begin(); p != v.end(); ++p) | |
16266 | { | |
e32de7ba | 16267 | indexes->push_back(p->index); |
16268 | vals->push_back(p->expr); | |
16269 | traverse_order->push_back(p->traversal_order); | |
00773463 | 16270 | } |
16271 | } | |
16272 | ||
e32de7ba | 16273 | Expression* ret = this->make_array(type, indexes, vals); |
16274 | Array_construction_expression* ace = ret->array_literal(); | |
16275 | if (ace != NULL && traverse_order != NULL) | |
16276 | ace->set_traverse_order(traverse_order); | |
16277 | return ret; | |
e440a328 | 16278 | } |
16279 | ||
16280 | // Actually build the array composite literal. This handles | |
16281 | // [...]{...}. | |
16282 | ||
16283 | Expression* | |
ffe743ca | 16284 | Composite_literal_expression::make_array( |
16285 | Type* type, | |
16286 | const std::vector<unsigned long>* indexes, | |
16287 | Expression_list* vals) | |
e440a328 | 16288 | { |
b13c66cd | 16289 | Location location = this->location(); |
e440a328 | 16290 | Array_type* at = type->array_type(); |
ffe743ca | 16291 | |
e440a328 | 16292 | if (at->length() != NULL && at->length()->is_nil_expression()) |
16293 | { | |
ffe743ca | 16294 | size_t size; |
16295 | if (vals == NULL) | |
16296 | size = 0; | |
00773463 | 16297 | else if (indexes != NULL) |
16298 | size = indexes->back() + 1; | |
16299 | else | |
ffe743ca | 16300 | { |
16301 | size = vals->size(); | |
16302 | Integer_type* it = Type::lookup_integer_type("int")->integer_type(); | |
16303 | if (sizeof(size) <= static_cast<size_t>(it->bits() * 8) | |
16304 | && size >> (it->bits() - 1) != 0) | |
16305 | { | |
631d5788 | 16306 | go_error_at(location, "too many elements in composite literal"); |
ffe743ca | 16307 | return Expression::make_error(location); |
16308 | } | |
16309 | } | |
ffe743ca | 16310 | |
e67508fa | 16311 | Expression* elen = Expression::make_integer_ul(size, NULL, location); |
e440a328 | 16312 | at = Type::make_array_type(at->element_type(), elen); |
16313 | type = at; | |
16314 | } | |
ffe743ca | 16315 | else if (at->length() != NULL |
16316 | && !at->length()->is_error_expression() | |
16317 | && this->vals_ != NULL) | |
16318 | { | |
16319 | Numeric_constant nc; | |
16320 | unsigned long val; | |
16321 | if (at->length()->numeric_constant_value(&nc) | |
16322 | && nc.to_unsigned_long(&val) == Numeric_constant::NC_UL_VALID) | |
16323 | { | |
16324 | if (indexes == NULL) | |
16325 | { | |
16326 | if (this->vals_->size() > val) | |
16327 | { | |
631d5788 | 16328 | go_error_at(location, |
16329 | "too many elements in composite literal"); | |
ffe743ca | 16330 | return Expression::make_error(location); |
16331 | } | |
16332 | } | |
16333 | else | |
16334 | { | |
00773463 | 16335 | unsigned long max = indexes->back(); |
ffe743ca | 16336 | if (max >= val) |
16337 | { | |
631d5788 | 16338 | go_error_at(location, |
16339 | ("some element keys in composite literal " | |
16340 | "are out of range")); | |
ffe743ca | 16341 | return Expression::make_error(location); |
16342 | } | |
16343 | } | |
16344 | } | |
16345 | } | |
16346 | ||
e440a328 | 16347 | if (at->length() != NULL) |
ffe743ca | 16348 | return new Fixed_array_construction_expression(type, indexes, vals, |
16349 | location); | |
e440a328 | 16350 | else |
2c809f8f | 16351 | return new Slice_construction_expression(type, indexes, vals, location); |
e440a328 | 16352 | } |
16353 | ||
16354 | // Lower a map composite literal. | |
16355 | ||
16356 | Expression* | |
a287720d | 16357 | Composite_literal_expression::lower_map(Gogo* gogo, Named_object* function, |
ceeb4318 | 16358 | Statement_inserter* inserter, |
a287720d | 16359 | Type* type) |
e440a328 | 16360 | { |
b13c66cd | 16361 | Location location = this->location(); |
f03a9fbf | 16362 | Unordered_map(unsigned int, std::vector<Expression*>) st; |
0ab32342 | 16363 | Unordered_map(unsigned int, std::vector<Expression*>) nt; |
e440a328 | 16364 | if (this->vals_ != NULL) |
16365 | { | |
16366 | if (!this->has_keys_) | |
16367 | { | |
631d5788 | 16368 | go_error_at(location, "map composite literal must have keys"); |
e440a328 | 16369 | return Expression::make_error(location); |
16370 | } | |
16371 | ||
a287720d | 16372 | for (Expression_list::iterator p = this->vals_->begin(); |
e440a328 | 16373 | p != this->vals_->end(); |
16374 | p += 2) | |
16375 | { | |
16376 | if (*p == NULL) | |
16377 | { | |
16378 | ++p; | |
631d5788 | 16379 | go_error_at((*p)->location(), |
16380 | ("map composite literal must " | |
16381 | "have keys for every value")); | |
e440a328 | 16382 | return Expression::make_error(location); |
16383 | } | |
a287720d | 16384 | // Make sure we have lowered the key; it may not have been |
16385 | // lowered in order to handle keys for struct composite | |
16386 | // literals. Lower it now to get the right error message. | |
16387 | if ((*p)->unknown_expression() != NULL) | |
16388 | { | |
16389 | (*p)->unknown_expression()->clear_is_composite_literal_key(); | |
ceeb4318 | 16390 | gogo->lower_expression(function, inserter, &*p); |
c484d925 | 16391 | go_assert((*p)->is_error_expression()); |
a287720d | 16392 | return Expression::make_error(location); |
16393 | } | |
f03a9fbf | 16394 | // Check if there are duplicate constant keys. |
16395 | if (!(*p)->is_constant()) | |
16396 | continue; | |
16397 | std::string sval; | |
0ab32342 | 16398 | Numeric_constant nval; |
16399 | if ((*p)->string_constant_value(&sval)) // Check string keys. | |
f03a9fbf | 16400 | { |
16401 | unsigned int h = Gogo::hash_string(sval, 0); | |
16402 | // Search the index h in the hash map. | |
16403 | Unordered_map(unsigned int, std::vector<Expression*>)::iterator mit; | |
16404 | mit = st.find(h); | |
16405 | if (mit == st.end()) | |
16406 | { | |
16407 | // No duplicate since h is a new index. | |
16408 | // Create a new vector indexed by h and add it to the hash map. | |
16409 | std::vector<Expression*> l; | |
16410 | l.push_back(*p); | |
16411 | std::pair<unsigned int, std::vector<Expression*> > val(h, l); | |
16412 | st.insert(val); | |
16413 | } | |
16414 | else | |
16415 | { | |
16416 | // Do further check since index h already exists. | |
16417 | for (std::vector<Expression*>::iterator lit = | |
16418 | mit->second.begin(); | |
16419 | lit != mit->second.end(); | |
16420 | lit++) | |
16421 | { | |
16422 | std::string s; | |
16423 | bool ok = (*lit)->string_constant_value(&s); | |
16424 | go_assert(ok); | |
16425 | if (s == sval) | |
16426 | { | |
16427 | go_error_at((*p)->location(), ("duplicate key " | |
16428 | "in map literal")); | |
16429 | return Expression::make_error(location); | |
16430 | } | |
16431 | } | |
16432 | // Add this new string key to the vector indexed by h. | |
16433 | mit->second.push_back(*p); | |
16434 | } | |
16435 | } | |
0ab32342 | 16436 | else if ((*p)->numeric_constant_value(&nval)) // Check numeric keys. |
16437 | { | |
16438 | unsigned int h = nval.hash(0); | |
16439 | Unordered_map(unsigned int, std::vector<Expression*>)::iterator mit; | |
16440 | mit = nt.find(h); | |
16441 | if (mit == nt.end()) | |
16442 | { | |
16443 | // No duplicate since h is a new code. | |
16444 | // Create a new vector indexed by h and add it to the hash map. | |
16445 | std::vector<Expression*> l; | |
16446 | l.push_back(*p); | |
16447 | std::pair<unsigned int, std::vector<Expression*> > val(h, l); | |
16448 | nt.insert(val); | |
16449 | } | |
16450 | else | |
16451 | { | |
16452 | // Do further check since h already exists. | |
16453 | for (std::vector<Expression*>::iterator lit = | |
16454 | mit->second.begin(); | |
16455 | lit != mit->second.end(); | |
16456 | lit++) | |
16457 | { | |
16458 | Numeric_constant rval; | |
16459 | bool ok = (*lit)->numeric_constant_value(&rval); | |
16460 | go_assert(ok); | |
16461 | if (nval.equals(rval)) | |
16462 | { | |
16463 | go_error_at((*p)->location(), | |
16464 | "duplicate key in map literal"); | |
16465 | return Expression::make_error(location); | |
16466 | } | |
16467 | } | |
16468 | // Add this new numeric key to the vector indexed by h. | |
16469 | mit->second.push_back(*p); | |
16470 | } | |
16471 | } | |
e440a328 | 16472 | } |
16473 | } | |
16474 | ||
16475 | return new Map_construction_expression(type, this->vals_, location); | |
16476 | } | |
16477 | ||
de590a61 | 16478 | // Copy. |
16479 | ||
16480 | Expression* | |
16481 | Composite_literal_expression::do_copy() | |
16482 | { | |
16483 | Composite_literal_expression* ret = | |
16484 | new Composite_literal_expression(this->type_->copy_expressions(), | |
16485 | this->depth_, this->has_keys_, | |
16486 | (this->vals_ == NULL | |
16487 | ? NULL | |
16488 | : this->vals_->copy()), | |
16489 | this->all_are_names_, | |
16490 | this->location()); | |
16491 | ret->key_path_ = this->key_path_; | |
16492 | return ret; | |
16493 | } | |
16494 | ||
d751bb78 | 16495 | // Dump ast representation for a composite literal expression. |
16496 | ||
16497 | void | |
16498 | Composite_literal_expression::do_dump_expression( | |
16499 | Ast_dump_context* ast_dump_context) const | |
16500 | { | |
8b1c301d | 16501 | ast_dump_context->ostream() << "composite("; |
d751bb78 | 16502 | ast_dump_context->dump_type(this->type_); |
16503 | ast_dump_context->ostream() << ", {"; | |
8b1c301d | 16504 | ast_dump_context->dump_expression_list(this->vals_, this->has_keys_); |
d751bb78 | 16505 | ast_dump_context->ostream() << "})"; |
16506 | } | |
16507 | ||
e440a328 | 16508 | // Make a composite literal expression. |
16509 | ||
16510 | Expression* | |
16511 | Expression::make_composite_literal(Type* type, int depth, bool has_keys, | |
62750cd5 | 16512 | Expression_list* vals, bool all_are_names, |
b13c66cd | 16513 | Location location) |
e440a328 | 16514 | { |
16515 | return new Composite_literal_expression(type, depth, has_keys, vals, | |
62750cd5 | 16516 | all_are_names, location); |
e440a328 | 16517 | } |
16518 | ||
16519 | // Return whether this expression is a composite literal. | |
16520 | ||
16521 | bool | |
16522 | Expression::is_composite_literal() const | |
16523 | { | |
16524 | switch (this->classification_) | |
16525 | { | |
16526 | case EXPRESSION_COMPOSITE_LITERAL: | |
16527 | case EXPRESSION_STRUCT_CONSTRUCTION: | |
16528 | case EXPRESSION_FIXED_ARRAY_CONSTRUCTION: | |
2c809f8f | 16529 | case EXPRESSION_SLICE_CONSTRUCTION: |
e440a328 | 16530 | case EXPRESSION_MAP_CONSTRUCTION: |
16531 | return true; | |
16532 | default: | |
16533 | return false; | |
16534 | } | |
16535 | } | |
16536 | ||
16537 | // Return whether this expression is a composite literal which is not | |
16538 | // constant. | |
16539 | ||
16540 | bool | |
16541 | Expression::is_nonconstant_composite_literal() const | |
16542 | { | |
16543 | switch (this->classification_) | |
16544 | { | |
16545 | case EXPRESSION_STRUCT_CONSTRUCTION: | |
16546 | { | |
16547 | const Struct_construction_expression *psce = | |
16548 | static_cast<const Struct_construction_expression*>(this); | |
16549 | return !psce->is_constant_struct(); | |
16550 | } | |
16551 | case EXPRESSION_FIXED_ARRAY_CONSTRUCTION: | |
16552 | { | |
16553 | const Fixed_array_construction_expression *pace = | |
16554 | static_cast<const Fixed_array_construction_expression*>(this); | |
16555 | return !pace->is_constant_array(); | |
16556 | } | |
2c809f8f | 16557 | case EXPRESSION_SLICE_CONSTRUCTION: |
e440a328 | 16558 | { |
2c809f8f | 16559 | const Slice_construction_expression *pace = |
16560 | static_cast<const Slice_construction_expression*>(this); | |
e440a328 | 16561 | return !pace->is_constant_array(); |
16562 | } | |
16563 | case EXPRESSION_MAP_CONSTRUCTION: | |
16564 | return true; | |
16565 | default: | |
16566 | return false; | |
16567 | } | |
16568 | } | |
16569 | ||
35a54f17 | 16570 | // Return true if this is a variable or temporary_variable. |
16571 | ||
16572 | bool | |
16573 | Expression::is_variable() const | |
16574 | { | |
16575 | switch (this->classification_) | |
16576 | { | |
16577 | case EXPRESSION_VAR_REFERENCE: | |
16578 | case EXPRESSION_TEMPORARY_REFERENCE: | |
16579 | case EXPRESSION_SET_AND_USE_TEMPORARY: | |
b0c09712 | 16580 | case EXPRESSION_ENCLOSED_VAR_REFERENCE: |
35a54f17 | 16581 | return true; |
16582 | default: | |
16583 | return false; | |
16584 | } | |
16585 | } | |
16586 | ||
e440a328 | 16587 | // Return true if this is a reference to a local variable. |
16588 | ||
16589 | bool | |
16590 | Expression::is_local_variable() const | |
16591 | { | |
16592 | const Var_expression* ve = this->var_expression(); | |
16593 | if (ve == NULL) | |
16594 | return false; | |
16595 | const Named_object* no = ve->named_object(); | |
16596 | return (no->is_result_variable() | |
16597 | || (no->is_variable() && !no->var_value()->is_global())); | |
16598 | } | |
16599 | ||
16600 | // Class Type_guard_expression. | |
16601 | ||
16602 | // Traversal. | |
16603 | ||
16604 | int | |
16605 | Type_guard_expression::do_traverse(Traverse* traverse) | |
16606 | { | |
16607 | if (Expression::traverse(&this->expr_, traverse) == TRAVERSE_EXIT | |
16608 | || Type::traverse(this->type_, traverse) == TRAVERSE_EXIT) | |
16609 | return TRAVERSE_EXIT; | |
16610 | return TRAVERSE_CONTINUE; | |
16611 | } | |
16612 | ||
2c809f8f | 16613 | Expression* |
16614 | Type_guard_expression::do_flatten(Gogo*, Named_object*, | |
16615 | Statement_inserter* inserter) | |
16616 | { | |
5bf8be8b | 16617 | if (this->expr_->is_error_expression() |
16618 | || this->expr_->type()->is_error_type()) | |
16619 | { | |
16620 | go_assert(saw_errors()); | |
16621 | return Expression::make_error(this->location()); | |
16622 | } | |
16623 | ||
2c809f8f | 16624 | if (!this->expr_->is_variable()) |
16625 | { | |
16626 | Temporary_statement* temp = Statement::make_temporary(NULL, this->expr_, | |
16627 | this->location()); | |
16628 | inserter->insert(temp); | |
16629 | this->expr_ = | |
16630 | Expression::make_temporary_reference(temp, this->location()); | |
16631 | } | |
16632 | return this; | |
16633 | } | |
16634 | ||
e440a328 | 16635 | // Check types of a type guard expression. The expression must have |
16636 | // an interface type, but the actual type conversion is checked at run | |
16637 | // time. | |
16638 | ||
16639 | void | |
16640 | Type_guard_expression::do_check_types(Gogo*) | |
16641 | { | |
e440a328 | 16642 | Type* expr_type = this->expr_->type(); |
7e9da23f | 16643 | if (expr_type->interface_type() == NULL) |
f725ade8 | 16644 | { |
5c13bd80 | 16645 | if (!expr_type->is_error() && !this->type_->is_error()) |
f725ade8 | 16646 | this->report_error(_("type assertion only valid for interface types")); |
16647 | this->set_is_error(); | |
16648 | } | |
e440a328 | 16649 | else if (this->type_->interface_type() == NULL) |
16650 | { | |
16651 | std::string reason; | |
16652 | if (!expr_type->interface_type()->implements_interface(this->type_, | |
16653 | &reason)) | |
16654 | { | |
5c13bd80 | 16655 | if (!this->type_->is_error()) |
e440a328 | 16656 | { |
f725ade8 | 16657 | if (reason.empty()) |
16658 | this->report_error(_("impossible type assertion: " | |
16659 | "type does not implement interface")); | |
16660 | else | |
631d5788 | 16661 | go_error_at(this->location(), |
16662 | ("impossible type assertion: " | |
16663 | "type does not implement interface (%s)"), | |
16664 | reason.c_str()); | |
e440a328 | 16665 | } |
f725ade8 | 16666 | this->set_is_error(); |
e440a328 | 16667 | } |
16668 | } | |
16669 | } | |
16670 | ||
de590a61 | 16671 | // Copy. |
16672 | ||
16673 | Expression* | |
16674 | Type_guard_expression::do_copy() | |
16675 | { | |
16676 | return new Type_guard_expression(this->expr_->copy(), | |
16677 | this->type_->copy_expressions(), | |
16678 | this->location()); | |
16679 | } | |
16680 | ||
ea664253 | 16681 | // Return the backend representation for a type guard expression. |
e440a328 | 16682 | |
ea664253 | 16683 | Bexpression* |
16684 | Type_guard_expression::do_get_backend(Translate_context* context) | |
e440a328 | 16685 | { |
2c809f8f | 16686 | Expression* conversion; |
7e9da23f | 16687 | if (this->type_->interface_type() != NULL) |
2c809f8f | 16688 | conversion = |
16689 | Expression::convert_interface_to_interface(this->type_, this->expr_, | |
16690 | true, this->location()); | |
e440a328 | 16691 | else |
2c809f8f | 16692 | conversion = |
16693 | Expression::convert_for_assignment(context->gogo(), this->type_, | |
16694 | this->expr_, this->location()); | |
16695 | ||
21b70e8f | 16696 | Gogo* gogo = context->gogo(); |
16697 | Btype* bt = this->type_->get_backend(gogo); | |
16698 | Bexpression* bexpr = conversion->get_backend(context); | |
16699 | return gogo->backend()->convert_expression(bt, bexpr, this->location()); | |
e440a328 | 16700 | } |
16701 | ||
d751bb78 | 16702 | // Dump ast representation for a type guard expression. |
16703 | ||
16704 | void | |
2c809f8f | 16705 | Type_guard_expression::do_dump_expression(Ast_dump_context* ast_dump_context) |
d751bb78 | 16706 | const |
16707 | { | |
16708 | this->expr_->dump_expression(ast_dump_context); | |
16709 | ast_dump_context->ostream() << "."; | |
16710 | ast_dump_context->dump_type(this->type_); | |
16711 | } | |
16712 | ||
e440a328 | 16713 | // Make a type guard expression. |
16714 | ||
16715 | Expression* | |
16716 | Expression::make_type_guard(Expression* expr, Type* type, | |
b13c66cd | 16717 | Location location) |
e440a328 | 16718 | { |
16719 | return new Type_guard_expression(expr, type, location); | |
16720 | } | |
16721 | ||
2c809f8f | 16722 | // Class Heap_expression. |
e440a328 | 16723 | |
da244e59 | 16724 | // Return the type of the expression stored on the heap. |
e440a328 | 16725 | |
da244e59 | 16726 | Type* |
16727 | Heap_expression::do_type() | |
16728 | { return Type::make_pointer_type(this->expr_->type()); } | |
e440a328 | 16729 | |
ea664253 | 16730 | // Return the backend representation for allocating an expression on the heap. |
e440a328 | 16731 | |
ea664253 | 16732 | Bexpression* |
16733 | Heap_expression::do_get_backend(Translate_context* context) | |
e440a328 | 16734 | { |
03118c21 | 16735 | Type* etype = this->expr_->type(); |
16736 | if (this->expr_->is_error_expression() || etype->is_error()) | |
ea664253 | 16737 | return context->backend()->error_expression(); |
2c809f8f | 16738 | |
02c19a1a | 16739 | Location loc = this->location(); |
2c809f8f | 16740 | Gogo* gogo = context->gogo(); |
02c19a1a | 16741 | Btype* btype = this->type()->get_backend(gogo); |
45ff893b | 16742 | |
03118c21 | 16743 | Expression* alloc = Expression::make_allocation(etype, loc); |
5973ede0 | 16744 | if (this->allocate_on_stack_) |
45ff893b | 16745 | alloc->allocation_expression()->set_allocate_on_stack(); |
16746 | Bexpression* space = alloc->get_backend(context); | |
02c19a1a | 16747 | |
16748 | Bstatement* decl; | |
16749 | Named_object* fn = context->function(); | |
16750 | go_assert(fn != NULL); | |
16751 | Bfunction* fndecl = fn->func_value()->get_or_make_decl(gogo, fn); | |
16752 | Bvariable* space_temp = | |
16753 | gogo->backend()->temporary_variable(fndecl, context->bblock(), btype, | |
16754 | space, true, loc, &decl); | |
03118c21 | 16755 | Btype* expr_btype = etype->get_backend(gogo); |
02c19a1a | 16756 | |
ea664253 | 16757 | Bexpression* bexpr = this->expr_->get_backend(context); |
03118c21 | 16758 | |
16759 | // If this assignment needs a write barrier, call typedmemmove. We | |
16760 | // don't do this in the write barrier pass because in some cases | |
16761 | // backend conversion can introduce new Heap_expression values. | |
16762 | Bstatement* assn; | |
06e83d10 | 16763 | if (!etype->has_pointer() || this->allocate_on_stack_) |
03118c21 | 16764 | { |
7af8e400 | 16765 | space = gogo->backend()->var_expression(space_temp, loc); |
03118c21 | 16766 | Bexpression* ref = |
16767 | gogo->backend()->indirect_expression(expr_btype, space, true, loc); | |
16768 | assn = gogo->backend()->assignment_statement(fndecl, ref, bexpr, loc); | |
16769 | } | |
16770 | else | |
16771 | { | |
16772 | Bstatement* edecl; | |
16773 | Bvariable* btemp = | |
16774 | gogo->backend()->temporary_variable(fndecl, context->bblock(), | |
16775 | expr_btype, bexpr, true, loc, | |
16776 | &edecl); | |
16777 | Bexpression* btempref = gogo->backend()->var_expression(btemp, | |
7af8e400 | 16778 | loc); |
7af8e400 | 16779 | space = gogo->backend()->var_expression(space_temp, loc); |
d6eeba01 | 16780 | Type* etype_ptr = Type::make_pointer_type(etype); |
03118c21 | 16781 | Expression* elhs = Expression::make_backend(space, etype_ptr, loc); |
d6eeba01 | 16782 | Expression* erhs; |
16783 | Expression* call; | |
16784 | if (etype->is_direct_iface_type()) | |
16785 | { | |
16786 | // Single pointer. | |
16787 | Type* uintptr_type = Type::lookup_integer_type("uintptr"); | |
16788 | erhs = Expression::make_backend(btempref, etype, loc); | |
16789 | erhs = Expression::unpack_direct_iface(erhs, loc); | |
16790 | erhs = Expression::make_unsafe_cast(uintptr_type, erhs, loc); | |
16791 | call = Runtime::make_call(Runtime::GCWRITEBARRIER, loc, 2, | |
16792 | elhs, erhs); | |
16793 | } | |
16794 | else | |
16795 | { | |
16796 | Expression* td = Expression::make_type_descriptor(etype, loc); | |
16797 | Bexpression* addr = | |
16798 | gogo->backend()->address_expression(btempref, loc); | |
16799 | erhs = Expression::make_backend(addr, etype_ptr, loc); | |
16800 | call = Runtime::make_call(Runtime::TYPEDMEMMOVE, loc, 3, | |
16801 | td, elhs, erhs); | |
16802 | } | |
16803 | Statement* cs = Statement::make_statement(call, false); | |
16804 | ||
16805 | space = gogo->backend()->var_expression(space_temp, loc); | |
16806 | Bexpression* ref = | |
16807 | gogo->backend()->indirect_expression(expr_btype, space, true, loc); | |
16808 | Expression* eref = Expression::make_backend(ref, etype, loc); | |
16809 | btempref = gogo->backend()->var_expression(btemp, loc); | |
16810 | erhs = Expression::make_backend(btempref, etype, loc); | |
16811 | Statement* as = Statement::make_assignment(eref, erhs, loc); | |
16812 | ||
16813 | as = gogo->check_write_barrier(context->block(), as, cs); | |
16814 | Bstatement* s = as->get_backend(context); | |
16815 | ||
03118c21 | 16816 | assn = gogo->backend()->compound_statement(edecl, s); |
16817 | } | |
02c19a1a | 16818 | decl = gogo->backend()->compound_statement(decl, assn); |
7af8e400 | 16819 | space = gogo->backend()->var_expression(space_temp, loc); |
ea664253 | 16820 | return gogo->backend()->compound_expression(decl, space, loc); |
e440a328 | 16821 | } |
16822 | ||
2c809f8f | 16823 | // Dump ast representation for a heap expression. |
d751bb78 | 16824 | |
16825 | void | |
2c809f8f | 16826 | Heap_expression::do_dump_expression( |
d751bb78 | 16827 | Ast_dump_context* ast_dump_context) const |
16828 | { | |
16829 | ast_dump_context->ostream() << "&("; | |
16830 | ast_dump_context->dump_expression(this->expr_); | |
16831 | ast_dump_context->ostream() << ")"; | |
16832 | } | |
16833 | ||
2c809f8f | 16834 | // Allocate an expression on the heap. |
e440a328 | 16835 | |
16836 | Expression* | |
2c809f8f | 16837 | Expression::make_heap_expression(Expression* expr, Location location) |
e440a328 | 16838 | { |
2c809f8f | 16839 | return new Heap_expression(expr, location); |
e440a328 | 16840 | } |
16841 | ||
16842 | // Class Receive_expression. | |
16843 | ||
16844 | // Return the type of a receive expression. | |
16845 | ||
16846 | Type* | |
16847 | Receive_expression::do_type() | |
16848 | { | |
e429e3bd | 16849 | if (this->is_error_expression()) |
16850 | return Type::make_error_type(); | |
e440a328 | 16851 | Channel_type* channel_type = this->channel_->type()->channel_type(); |
16852 | if (channel_type == NULL) | |
e429e3bd | 16853 | { |
16854 | this->report_error(_("expected channel")); | |
16855 | return Type::make_error_type(); | |
16856 | } | |
e440a328 | 16857 | return channel_type->element_type(); |
16858 | } | |
16859 | ||
16860 | // Check types for a receive expression. | |
16861 | ||
16862 | void | |
16863 | Receive_expression::do_check_types(Gogo*) | |
16864 | { | |
16865 | Type* type = this->channel_->type(); | |
5c13bd80 | 16866 | if (type->is_error()) |
e440a328 | 16867 | { |
e429e3bd | 16868 | go_assert(saw_errors()); |
e440a328 | 16869 | this->set_is_error(); |
16870 | return; | |
16871 | } | |
16872 | if (type->channel_type() == NULL) | |
16873 | { | |
16874 | this->report_error(_("expected channel")); | |
16875 | return; | |
16876 | } | |
16877 | if (!type->channel_type()->may_receive()) | |
16878 | { | |
16879 | this->report_error(_("invalid receive on send-only channel")); | |
16880 | return; | |
16881 | } | |
16882 | } | |
16883 | ||
2c809f8f | 16884 | // Flattening for receive expressions creates a temporary variable to store |
16885 | // received data in for receives. | |
16886 | ||
16887 | Expression* | |
16888 | Receive_expression::do_flatten(Gogo*, Named_object*, | |
16889 | Statement_inserter* inserter) | |
16890 | { | |
16891 | Channel_type* channel_type = this->channel_->type()->channel_type(); | |
16892 | if (channel_type == NULL) | |
16893 | { | |
16894 | go_assert(saw_errors()); | |
16895 | return this; | |
16896 | } | |
5bf8be8b | 16897 | else if (this->channel_->is_error_expression()) |
16898 | { | |
16899 | go_assert(saw_errors()); | |
16900 | return Expression::make_error(this->location()); | |
16901 | } | |
2c809f8f | 16902 | |
16903 | Type* element_type = channel_type->element_type(); | |
16904 | if (this->temp_receiver_ == NULL) | |
16905 | { | |
16906 | this->temp_receiver_ = Statement::make_temporary(element_type, NULL, | |
16907 | this->location()); | |
16908 | this->temp_receiver_->set_is_address_taken(); | |
16909 | inserter->insert(this->temp_receiver_); | |
16910 | } | |
16911 | ||
16912 | return this; | |
16913 | } | |
16914 | ||
ea664253 | 16915 | // Get the backend representation for a receive expression. |
e440a328 | 16916 | |
ea664253 | 16917 | Bexpression* |
16918 | Receive_expression::do_get_backend(Translate_context* context) | |
e440a328 | 16919 | { |
f24f10bb | 16920 | Location loc = this->location(); |
16921 | ||
e440a328 | 16922 | Channel_type* channel_type = this->channel_->type()->channel_type(); |
5b8368f4 | 16923 | if (channel_type == NULL) |
16924 | { | |
c484d925 | 16925 | go_assert(this->channel_->type()->is_error()); |
ea664253 | 16926 | return context->backend()->error_expression(); |
5b8368f4 | 16927 | } |
e440a328 | 16928 | |
2c809f8f | 16929 | Expression* recv_ref = |
16930 | Expression::make_temporary_reference(this->temp_receiver_, loc); | |
16931 | Expression* recv_addr = | |
16932 | Expression::make_temporary_reference(this->temp_receiver_, loc); | |
16933 | recv_addr = Expression::make_unary(OPERATOR_AND, recv_addr, loc); | |
e36a5ff5 | 16934 | Expression* recv = Runtime::make_call(Runtime::CHANRECV1, loc, 2, |
16935 | this->channel_, recv_addr); | |
ea664253 | 16936 | return Expression::make_compound(recv, recv_ref, loc)->get_backend(context); |
e440a328 | 16937 | } |
16938 | ||
0b2617a3 | 16939 | // Export a receive expression. |
16940 | ||
16941 | void | |
16942 | Receive_expression::do_export(Export_function_body* efb) const | |
16943 | { | |
16944 | efb->write_c_string("<-"); | |
16945 | this->channel_->export_expression(efb); | |
16946 | } | |
16947 | ||
d751bb78 | 16948 | // Dump ast representation for a receive expression. |
16949 | ||
16950 | void | |
16951 | Receive_expression::do_dump_expression(Ast_dump_context* ast_dump_context) const | |
16952 | { | |
16953 | ast_dump_context->ostream() << " <- " ; | |
16954 | ast_dump_context->dump_expression(channel_); | |
16955 | } | |
16956 | ||
0b2617a3 | 16957 | // Import a receive expression. |
16958 | ||
16959 | Expression* | |
16960 | Receive_expression::do_import(Import_expression* imp, Location loc) | |
16961 | { | |
16962 | imp->require_c_string("<-"); | |
16963 | Expression* expr = Expression::import_expression(imp, loc); | |
16964 | return Expression::make_receive(expr, loc); | |
16965 | } | |
16966 | ||
e440a328 | 16967 | // Make a receive expression. |
16968 | ||
16969 | Receive_expression* | |
b13c66cd | 16970 | Expression::make_receive(Expression* channel, Location location) |
e440a328 | 16971 | { |
16972 | return new Receive_expression(channel, location); | |
16973 | } | |
16974 | ||
e440a328 | 16975 | // An expression which evaluates to a pointer to the type descriptor |
16976 | // of a type. | |
16977 | ||
16978 | class Type_descriptor_expression : public Expression | |
16979 | { | |
16980 | public: | |
b13c66cd | 16981 | Type_descriptor_expression(Type* type, Location location) |
e440a328 | 16982 | : Expression(EXPRESSION_TYPE_DESCRIPTOR, location), |
16983 | type_(type) | |
16984 | { } | |
16985 | ||
16986 | protected: | |
4b686186 | 16987 | int |
16988 | do_traverse(Traverse*); | |
16989 | ||
e440a328 | 16990 | Type* |
16991 | do_type() | |
16992 | { return Type::make_type_descriptor_ptr_type(); } | |
16993 | ||
f9ca30f9 | 16994 | bool |
3ae06f68 | 16995 | do_is_static_initializer() const |
f9ca30f9 | 16996 | { return true; } |
16997 | ||
e440a328 | 16998 | void |
16999 | do_determine_type(const Type_context*) | |
17000 | { } | |
17001 | ||
17002 | Expression* | |
17003 | do_copy() | |
17004 | { return this; } | |
17005 | ||
ea664253 | 17006 | Bexpression* |
17007 | do_get_backend(Translate_context* context) | |
a1d23b41 | 17008 | { |
ea664253 | 17009 | return this->type_->type_descriptor_pointer(context->gogo(), |
17010 | this->location()); | |
a1d23b41 | 17011 | } |
e440a328 | 17012 | |
d751bb78 | 17013 | void |
17014 | do_dump_expression(Ast_dump_context*) const; | |
17015 | ||
e440a328 | 17016 | private: |
17017 | // The type for which this is the descriptor. | |
17018 | Type* type_; | |
17019 | }; | |
17020 | ||
4b686186 | 17021 | int |
17022 | Type_descriptor_expression::do_traverse(Traverse* traverse) | |
17023 | { | |
17024 | if (Type::traverse(this->type_, traverse) == TRAVERSE_EXIT) | |
17025 | return TRAVERSE_EXIT; | |
17026 | return TRAVERSE_CONTINUE; | |
17027 | } | |
17028 | ||
d751bb78 | 17029 | // Dump ast representation for a type descriptor expression. |
17030 | ||
17031 | void | |
17032 | Type_descriptor_expression::do_dump_expression( | |
17033 | Ast_dump_context* ast_dump_context) const | |
17034 | { | |
17035 | ast_dump_context->dump_type(this->type_); | |
17036 | } | |
17037 | ||
e440a328 | 17038 | // Make a type descriptor expression. |
17039 | ||
17040 | Expression* | |
b13c66cd | 17041 | Expression::make_type_descriptor(Type* type, Location location) |
e440a328 | 17042 | { |
17043 | return new Type_descriptor_expression(type, location); | |
17044 | } | |
17045 | ||
aa5ae575 | 17046 | // An expression which evaluates to a pointer to the Garbage Collection symbol |
17047 | // of a type. | |
17048 | ||
17049 | class GC_symbol_expression : public Expression | |
17050 | { | |
17051 | public: | |
17052 | GC_symbol_expression(Type* type) | |
17053 | : Expression(EXPRESSION_GC_SYMBOL, Linemap::predeclared_location()), | |
17054 | type_(type) | |
17055 | {} | |
17056 | ||
17057 | protected: | |
17058 | Type* | |
17059 | do_type() | |
03118c21 | 17060 | { return Type::make_pointer_type(Type::lookup_integer_type("uint8")); } |
aa5ae575 | 17061 | |
17062 | bool | |
3ae06f68 | 17063 | do_is_static_initializer() const |
aa5ae575 | 17064 | { return true; } |
17065 | ||
17066 | void | |
17067 | do_determine_type(const Type_context*) | |
17068 | { } | |
17069 | ||
17070 | Expression* | |
17071 | do_copy() | |
17072 | { return this; } | |
17073 | ||
17074 | Bexpression* | |
17075 | do_get_backend(Translate_context* context) | |
17076 | { return this->type_->gc_symbol_pointer(context->gogo()); } | |
17077 | ||
17078 | void | |
17079 | do_dump_expression(Ast_dump_context*) const; | |
17080 | ||
17081 | private: | |
17082 | // The type which this gc symbol describes. | |
17083 | Type* type_; | |
17084 | }; | |
17085 | ||
17086 | // Dump ast representation for a gc symbol expression. | |
17087 | ||
17088 | void | |
17089 | GC_symbol_expression::do_dump_expression( | |
17090 | Ast_dump_context* ast_dump_context) const | |
17091 | { | |
17092 | ast_dump_context->ostream() << "gcdata("; | |
17093 | ast_dump_context->dump_type(this->type_); | |
17094 | ast_dump_context->ostream() << ")"; | |
17095 | } | |
17096 | ||
17097 | // Make a gc symbol expression. | |
17098 | ||
17099 | Expression* | |
17100 | Expression::make_gc_symbol(Type* type) | |
17101 | { | |
17102 | return new GC_symbol_expression(type); | |
17103 | } | |
17104 | ||
03118c21 | 17105 | // An expression that evaluates to a pointer to a symbol holding the |
17106 | // ptrmask data of a type. | |
17107 | ||
17108 | class Ptrmask_symbol_expression : public Expression | |
17109 | { | |
17110 | public: | |
17111 | Ptrmask_symbol_expression(Type* type) | |
17112 | : Expression(EXPRESSION_PTRMASK_SYMBOL, Linemap::predeclared_location()), | |
17113 | type_(type) | |
17114 | {} | |
17115 | ||
17116 | protected: | |
17117 | Type* | |
17118 | do_type() | |
17119 | { return Type::make_pointer_type(Type::lookup_integer_type("uint8")); } | |
17120 | ||
17121 | bool | |
17122 | do_is_static_initializer() const | |
17123 | { return true; } | |
17124 | ||
17125 | void | |
17126 | do_determine_type(const Type_context*) | |
17127 | { } | |
17128 | ||
17129 | Expression* | |
17130 | do_copy() | |
17131 | { return this; } | |
17132 | ||
17133 | Bexpression* | |
17134 | do_get_backend(Translate_context*); | |
17135 | ||
17136 | void | |
17137 | do_dump_expression(Ast_dump_context*) const; | |
17138 | ||
17139 | private: | |
17140 | // The type that this ptrmask symbol describes. | |
17141 | Type* type_; | |
17142 | }; | |
17143 | ||
17144 | // Return the ptrmask variable. | |
17145 | ||
17146 | Bexpression* | |
17147 | Ptrmask_symbol_expression::do_get_backend(Translate_context* context) | |
17148 | { | |
17149 | Gogo* gogo = context->gogo(); | |
17150 | ||
17151 | // If this type does not need a gcprog, then we can use the standard | |
17152 | // GC symbol. | |
17153 | int64_t ptrsize, ptrdata; | |
17154 | if (!this->type_->needs_gcprog(gogo, &ptrsize, &ptrdata)) | |
17155 | return this->type_->gc_symbol_pointer(gogo); | |
17156 | ||
17157 | // Otherwise we have to build a ptrmask variable, and return a | |
17158 | // pointer to it. | |
17159 | ||
17160 | Bvariable* bvar = this->type_->gc_ptrmask_var(gogo, ptrsize, ptrdata); | |
17161 | Location bloc = Linemap::predeclared_location(); | |
7af8e400 | 17162 | Bexpression* bref = gogo->backend()->var_expression(bvar, bloc); |
03118c21 | 17163 | Bexpression* baddr = gogo->backend()->address_expression(bref, bloc); |
17164 | ||
17165 | Type* uint8_type = Type::lookup_integer_type("uint8"); | |
17166 | Type* pointer_uint8_type = Type::make_pointer_type(uint8_type); | |
17167 | Btype* ubtype = pointer_uint8_type->get_backend(gogo); | |
17168 | return gogo->backend()->convert_expression(ubtype, baddr, bloc); | |
17169 | } | |
17170 | ||
17171 | // Dump AST for a ptrmask symbol expression. | |
17172 | ||
17173 | void | |
17174 | Ptrmask_symbol_expression::do_dump_expression( | |
17175 | Ast_dump_context* ast_dump_context) const | |
17176 | { | |
17177 | ast_dump_context->ostream() << "ptrmask("; | |
17178 | ast_dump_context->dump_type(this->type_); | |
17179 | ast_dump_context->ostream() << ")"; | |
17180 | } | |
17181 | ||
17182 | // Make a ptrmask symbol expression. | |
17183 | ||
17184 | Expression* | |
17185 | Expression::make_ptrmask_symbol(Type* type) | |
17186 | { | |
17187 | return new Ptrmask_symbol_expression(type); | |
17188 | } | |
17189 | ||
e440a328 | 17190 | // An expression which evaluates to some characteristic of a type. |
17191 | // This is only used to initialize fields of a type descriptor. Using | |
17192 | // a new expression class is slightly inefficient but gives us a good | |
17193 | // separation between the frontend and the middle-end with regard to | |
17194 | // how types are laid out. | |
17195 | ||
17196 | class Type_info_expression : public Expression | |
17197 | { | |
17198 | public: | |
17199 | Type_info_expression(Type* type, Type_info type_info) | |
b13c66cd | 17200 | : Expression(EXPRESSION_TYPE_INFO, Linemap::predeclared_location()), |
e440a328 | 17201 | type_(type), type_info_(type_info) |
17202 | { } | |
17203 | ||
17204 | protected: | |
0e168074 | 17205 | bool |
3ae06f68 | 17206 | do_is_static_initializer() const |
0e168074 | 17207 | { return true; } |
17208 | ||
e440a328 | 17209 | Type* |
17210 | do_type(); | |
17211 | ||
17212 | void | |
17213 | do_determine_type(const Type_context*) | |
17214 | { } | |
17215 | ||
17216 | Expression* | |
17217 | do_copy() | |
17218 | { return this; } | |
17219 | ||
ea664253 | 17220 | Bexpression* |
17221 | do_get_backend(Translate_context* context); | |
e440a328 | 17222 | |
d751bb78 | 17223 | void |
17224 | do_dump_expression(Ast_dump_context*) const; | |
17225 | ||
e440a328 | 17226 | private: |
17227 | // The type for which we are getting information. | |
17228 | Type* type_; | |
17229 | // What information we want. | |
17230 | Type_info type_info_; | |
17231 | }; | |
17232 | ||
17233 | // The type is chosen to match what the type descriptor struct | |
17234 | // expects. | |
17235 | ||
17236 | Type* | |
17237 | Type_info_expression::do_type() | |
17238 | { | |
17239 | switch (this->type_info_) | |
17240 | { | |
17241 | case TYPE_INFO_SIZE: | |
03118c21 | 17242 | case TYPE_INFO_BACKEND_PTRDATA: |
17243 | case TYPE_INFO_DESCRIPTOR_PTRDATA: | |
e440a328 | 17244 | return Type::lookup_integer_type("uintptr"); |
17245 | case TYPE_INFO_ALIGNMENT: | |
17246 | case TYPE_INFO_FIELD_ALIGNMENT: | |
17247 | return Type::lookup_integer_type("uint8"); | |
17248 | default: | |
c3e6f413 | 17249 | go_unreachable(); |
e440a328 | 17250 | } |
17251 | } | |
17252 | ||
ea664253 | 17253 | // Return the backend representation for type information. |
e440a328 | 17254 | |
ea664253 | 17255 | Bexpression* |
17256 | Type_info_expression::do_get_backend(Translate_context* context) | |
e440a328 | 17257 | { |
927a01eb | 17258 | Gogo* gogo = context->gogo(); |
2a305b85 | 17259 | bool ok = true; |
3f378015 | 17260 | int64_t val; |
927a01eb | 17261 | switch (this->type_info_) |
e440a328 | 17262 | { |
927a01eb | 17263 | case TYPE_INFO_SIZE: |
2a305b85 | 17264 | ok = this->type_->backend_type_size(gogo, &val); |
927a01eb | 17265 | break; |
17266 | case TYPE_INFO_ALIGNMENT: | |
2a305b85 | 17267 | ok = this->type_->backend_type_align(gogo, &val); |
927a01eb | 17268 | break; |
17269 | case TYPE_INFO_FIELD_ALIGNMENT: | |
2a305b85 | 17270 | ok = this->type_->backend_type_field_align(gogo, &val); |
927a01eb | 17271 | break; |
03118c21 | 17272 | case TYPE_INFO_BACKEND_PTRDATA: |
17273 | ok = this->type_->backend_type_ptrdata(gogo, &val); | |
17274 | break; | |
17275 | case TYPE_INFO_DESCRIPTOR_PTRDATA: | |
17276 | ok = this->type_->descriptor_ptrdata(gogo, &val); | |
17277 | break; | |
927a01eb | 17278 | default: |
17279 | go_unreachable(); | |
e440a328 | 17280 | } |
2a305b85 | 17281 | if (!ok) |
17282 | { | |
17283 | go_assert(saw_errors()); | |
17284 | return gogo->backend()->error_expression(); | |
17285 | } | |
3f378015 | 17286 | Expression* e = Expression::make_integer_int64(val, this->type(), |
17287 | this->location()); | |
17288 | return e->get_backend(context); | |
e440a328 | 17289 | } |
17290 | ||
d751bb78 | 17291 | // Dump ast representation for a type info expression. |
17292 | ||
17293 | void | |
17294 | Type_info_expression::do_dump_expression( | |
17295 | Ast_dump_context* ast_dump_context) const | |
17296 | { | |
17297 | ast_dump_context->ostream() << "typeinfo("; | |
17298 | ast_dump_context->dump_type(this->type_); | |
17299 | ast_dump_context->ostream() << ","; | |
f03a9fbf | 17300 | ast_dump_context->ostream() << |
17301 | (this->type_info_ == TYPE_INFO_ALIGNMENT ? "alignment" | |
d751bb78 | 17302 | : this->type_info_ == TYPE_INFO_FIELD_ALIGNMENT ? "field alignment" |
03118c21 | 17303 | : this->type_info_ == TYPE_INFO_SIZE ? "size" |
17304 | : this->type_info_ == TYPE_INFO_BACKEND_PTRDATA ? "backend_ptrdata" | |
17305 | : this->type_info_ == TYPE_INFO_DESCRIPTOR_PTRDATA ? "descriptor_ptrdata" | |
d751bb78 | 17306 | : "unknown"); |
17307 | ast_dump_context->ostream() << ")"; | |
17308 | } | |
17309 | ||
e440a328 | 17310 | // Make a type info expression. |
17311 | ||
17312 | Expression* | |
17313 | Expression::make_type_info(Type* type, Type_info type_info) | |
17314 | { | |
17315 | return new Type_info_expression(type, type_info); | |
17316 | } | |
17317 | ||
35a54f17 | 17318 | // An expression that evaluates to some characteristic of a slice. |
17319 | // This is used when indexing, bound-checking, or nil checking a slice. | |
17320 | ||
17321 | class Slice_info_expression : public Expression | |
17322 | { | |
17323 | public: | |
17324 | Slice_info_expression(Expression* slice, Slice_info slice_info, | |
17325 | Location location) | |
17326 | : Expression(EXPRESSION_SLICE_INFO, location), | |
17327 | slice_(slice), slice_info_(slice_info) | |
17328 | { } | |
17329 | ||
17330 | protected: | |
17331 | Type* | |
17332 | do_type(); | |
17333 | ||
17334 | void | |
17335 | do_determine_type(const Type_context*) | |
17336 | { } | |
17337 | ||
17338 | Expression* | |
17339 | do_copy() | |
17340 | { | |
17341 | return new Slice_info_expression(this->slice_->copy(), this->slice_info_, | |
17342 | this->location()); | |
17343 | } | |
17344 | ||
ea664253 | 17345 | Bexpression* |
17346 | do_get_backend(Translate_context* context); | |
35a54f17 | 17347 | |
17348 | void | |
17349 | do_dump_expression(Ast_dump_context*) const; | |
17350 | ||
17351 | void | |
17352 | do_issue_nil_check() | |
17353 | { this->slice_->issue_nil_check(); } | |
17354 | ||
17355 | private: | |
17356 | // The slice for which we are getting information. | |
17357 | Expression* slice_; | |
17358 | // What information we want. | |
17359 | Slice_info slice_info_; | |
17360 | }; | |
17361 | ||
17362 | // Return the type of the slice info. | |
17363 | ||
17364 | Type* | |
17365 | Slice_info_expression::do_type() | |
17366 | { | |
17367 | switch (this->slice_info_) | |
17368 | { | |
17369 | case SLICE_INFO_VALUE_POINTER: | |
17370 | return Type::make_pointer_type( | |
17371 | this->slice_->type()->array_type()->element_type()); | |
17372 | case SLICE_INFO_LENGTH: | |
17373 | case SLICE_INFO_CAPACITY: | |
17374 | return Type::lookup_integer_type("int"); | |
17375 | default: | |
17376 | go_unreachable(); | |
17377 | } | |
17378 | } | |
17379 | ||
ea664253 | 17380 | // Return the backend information for slice information. |
35a54f17 | 17381 | |
ea664253 | 17382 | Bexpression* |
17383 | Slice_info_expression::do_get_backend(Translate_context* context) | |
35a54f17 | 17384 | { |
17385 | Gogo* gogo = context->gogo(); | |
ea664253 | 17386 | Bexpression* bslice = this->slice_->get_backend(context); |
35a54f17 | 17387 | switch (this->slice_info_) |
17388 | { | |
17389 | case SLICE_INFO_VALUE_POINTER: | |
17390 | case SLICE_INFO_LENGTH: | |
17391 | case SLICE_INFO_CAPACITY: | |
ea664253 | 17392 | return gogo->backend()->struct_field_expression(bslice, this->slice_info_, |
17393 | this->location()); | |
35a54f17 | 17394 | break; |
17395 | default: | |
17396 | go_unreachable(); | |
17397 | } | |
35a54f17 | 17398 | } |
17399 | ||
17400 | // Dump ast representation for a type info expression. | |
17401 | ||
17402 | void | |
17403 | Slice_info_expression::do_dump_expression( | |
17404 | Ast_dump_context* ast_dump_context) const | |
17405 | { | |
17406 | ast_dump_context->ostream() << "sliceinfo("; | |
17407 | this->slice_->dump_expression(ast_dump_context); | |
17408 | ast_dump_context->ostream() << ","; | |
f03a9fbf | 17409 | ast_dump_context->ostream() << |
17410 | (this->slice_info_ == SLICE_INFO_VALUE_POINTER ? "values" | |
35a54f17 | 17411 | : this->slice_info_ == SLICE_INFO_LENGTH ? "length" |
17412 | : this->slice_info_ == SLICE_INFO_CAPACITY ? "capacity " | |
17413 | : "unknown"); | |
17414 | ast_dump_context->ostream() << ")"; | |
17415 | } | |
17416 | ||
17417 | // Make a slice info expression. | |
17418 | ||
17419 | Expression* | |
17420 | Expression::make_slice_info(Expression* slice, Slice_info slice_info, | |
17421 | Location location) | |
17422 | { | |
17423 | return new Slice_info_expression(slice, slice_info, location); | |
17424 | } | |
17425 | ||
d633d0fb | 17426 | // Class Slice_value_expression. |
2c809f8f | 17427 | |
17428 | int | |
17429 | Slice_value_expression::do_traverse(Traverse* traverse) | |
17430 | { | |
55e8ba6a | 17431 | if (Type::traverse(this->type_, traverse) == TRAVERSE_EXIT |
d633d0fb | 17432 | || Expression::traverse(&this->valmem_, traverse) == TRAVERSE_EXIT |
2c809f8f | 17433 | || Expression::traverse(&this->len_, traverse) == TRAVERSE_EXIT |
17434 | || Expression::traverse(&this->cap_, traverse) == TRAVERSE_EXIT) | |
17435 | return TRAVERSE_EXIT; | |
17436 | return TRAVERSE_CONTINUE; | |
17437 | } | |
17438 | ||
d633d0fb | 17439 | Expression* |
17440 | Slice_value_expression::do_copy() | |
17441 | { | |
17442 | return new Slice_value_expression(this->type_->copy_expressions(), | |
17443 | this->valmem_->copy(), | |
17444 | this->len_->copy(), this->cap_->copy(), | |
17445 | this->location()); | |
17446 | } | |
17447 | ||
ea664253 | 17448 | Bexpression* |
17449 | Slice_value_expression::do_get_backend(Translate_context* context) | |
2c809f8f | 17450 | { |
17451 | std::vector<Bexpression*> vals(3); | |
d633d0fb | 17452 | vals[0] = this->valmem_->get_backend(context); |
ea664253 | 17453 | vals[1] = this->len_->get_backend(context); |
17454 | vals[2] = this->cap_->get_backend(context); | |
2c809f8f | 17455 | |
17456 | Gogo* gogo = context->gogo(); | |
17457 | Btype* btype = this->type_->get_backend(gogo); | |
ea664253 | 17458 | return gogo->backend()->constructor_expression(btype, vals, this->location()); |
2c809f8f | 17459 | } |
17460 | ||
17461 | void | |
17462 | Slice_value_expression::do_dump_expression( | |
17463 | Ast_dump_context* ast_dump_context) const | |
17464 | { | |
17465 | ast_dump_context->ostream() << "slicevalue("; | |
17466 | ast_dump_context->ostream() << "values: "; | |
d633d0fb | 17467 | this->valmem_->dump_expression(ast_dump_context); |
2c809f8f | 17468 | ast_dump_context->ostream() << ", length: "; |
17469 | this->len_->dump_expression(ast_dump_context); | |
17470 | ast_dump_context->ostream() << ", capacity: "; | |
17471 | this->cap_->dump_expression(ast_dump_context); | |
17472 | ast_dump_context->ostream() << ")"; | |
17473 | } | |
17474 | ||
17475 | Expression* | |
d633d0fb | 17476 | Expression::make_slice_value(Type* at, Expression* valmem, Expression* len, |
2c809f8f | 17477 | Expression* cap, Location location) |
17478 | { | |
17479 | go_assert(at->is_slice_type()); | |
d633d0fb | 17480 | go_assert(valmem->is_nil_expression() |
17481 | || (at->array_type()->element_type() | |
17482 | == valmem->type()->points_to())); | |
17483 | return new Slice_value_expression(at, valmem, len, cap, location); | |
2c809f8f | 17484 | } |
2387f644 | 17485 | |
38ba9eec | 17486 | // Look through the expression of a Slice_value_expression's valmem to |
17487 | // find an call to makeslice. If found, return the call expression and | |
17488 | // the containing temporary statement (if any). | |
17489 | ||
17490 | std::pair<Call_expression*, Temporary_statement*> | |
17491 | Expression::find_makeslice_call(Expression* expr) | |
17492 | { | |
17493 | Unsafe_type_conversion_expression* utce = | |
17494 | expr->unsafe_conversion_expression(); | |
17495 | if (utce != NULL) | |
17496 | expr = utce->expr(); | |
17497 | ||
17498 | Slice_value_expression* sve = expr->slice_value_expression(); | |
17499 | if (sve == NULL) | |
17500 | return std::make_pair<Call_expression*, Temporary_statement*>(NULL, NULL); | |
17501 | expr = sve->valmem(); | |
17502 | ||
17503 | utce = expr->unsafe_conversion_expression(); | |
17504 | if (utce != NULL) | |
17505 | expr = utce->expr(); | |
17506 | ||
17507 | Temporary_reference_expression* tre = expr->temporary_reference_expression(); | |
17508 | Temporary_statement* ts = (tre != NULL ? tre->statement() : NULL); | |
17509 | if (ts != NULL && ts->init() != NULL && !ts->assigned() | |
17510 | && !ts->is_address_taken()) | |
17511 | expr = ts->init(); | |
17512 | ||
17513 | Call_expression* call = expr->call_expression(); | |
17514 | if (call == NULL) | |
17515 | return std::make_pair<Call_expression*, Temporary_statement*>(NULL, NULL); | |
17516 | ||
17517 | Func_expression* fe = call->fn()->func_expression(); | |
17518 | if (fe != NULL | |
17519 | && fe->runtime_code() == Runtime::MAKESLICE) | |
17520 | return std::make_pair(call, ts); | |
17521 | ||
17522 | return std::make_pair<Call_expression*, Temporary_statement*>(NULL, NULL); | |
17523 | } | |
17524 | ||
2387f644 | 17525 | // An expression that evaluates to some characteristic of a non-empty interface. |
17526 | // This is used to access the method table or underlying object of an interface. | |
17527 | ||
17528 | class Interface_info_expression : public Expression | |
17529 | { | |
17530 | public: | |
17531 | Interface_info_expression(Expression* iface, Interface_info iface_info, | |
2c809f8f | 17532 | Location location) |
2387f644 | 17533 | : Expression(EXPRESSION_INTERFACE_INFO, location), |
17534 | iface_(iface), iface_info_(iface_info) | |
17535 | { } | |
17536 | ||
17537 | protected: | |
17538 | Type* | |
17539 | do_type(); | |
17540 | ||
17541 | void | |
17542 | do_determine_type(const Type_context*) | |
17543 | { } | |
17544 | ||
17545 | Expression* | |
17546 | do_copy() | |
17547 | { | |
17548 | return new Interface_info_expression(this->iface_->copy(), | |
17549 | this->iface_info_, this->location()); | |
17550 | } | |
17551 | ||
ea664253 | 17552 | Bexpression* |
17553 | do_get_backend(Translate_context* context); | |
2387f644 | 17554 | |
17555 | void | |
17556 | do_dump_expression(Ast_dump_context*) const; | |
17557 | ||
17558 | void | |
17559 | do_issue_nil_check() | |
17560 | { this->iface_->issue_nil_check(); } | |
17561 | ||
17562 | private: | |
17563 | // The interface for which we are getting information. | |
17564 | Expression* iface_; | |
17565 | // What information we want. | |
17566 | Interface_info iface_info_; | |
17567 | }; | |
17568 | ||
17569 | // Return the type of the interface info. | |
17570 | ||
17571 | Type* | |
17572 | Interface_info_expression::do_type() | |
17573 | { | |
17574 | switch (this->iface_info_) | |
17575 | { | |
17576 | case INTERFACE_INFO_METHODS: | |
17577 | { | |
625d3118 | 17578 | typedef Unordered_map(Interface_type*, Type*) Hashtable; |
17579 | static Hashtable result_types; | |
17580 | ||
17581 | Interface_type* itype = this->iface_->type()->interface_type(); | |
17582 | ||
17583 | Hashtable::const_iterator p = result_types.find(itype); | |
17584 | if (p != result_types.end()) | |
17585 | return p->second; | |
17586 | ||
2c809f8f | 17587 | Type* pdt = Type::make_type_descriptor_ptr_type(); |
625d3118 | 17588 | if (itype->is_empty()) |
17589 | { | |
17590 | result_types[itype] = pdt; | |
17591 | return pdt; | |
17592 | } | |
2c809f8f | 17593 | |
2387f644 | 17594 | Location loc = this->location(); |
17595 | Struct_field_list* sfl = new Struct_field_list(); | |
2387f644 | 17596 | sfl->push_back( |
17597 | Struct_field(Typed_identifier("__type_descriptor", pdt, loc))); | |
17598 | ||
2387f644 | 17599 | for (Typed_identifier_list::const_iterator p = itype->methods()->begin(); |
17600 | p != itype->methods()->end(); | |
17601 | ++p) | |
17602 | { | |
17603 | Function_type* ft = p->type()->function_type(); | |
17604 | go_assert(ft->receiver() == NULL); | |
17605 | ||
17606 | const Typed_identifier_list* params = ft->parameters(); | |
17607 | Typed_identifier_list* mparams = new Typed_identifier_list(); | |
17608 | if (params != NULL) | |
17609 | mparams->reserve(params->size() + 1); | |
17610 | Type* vt = Type::make_pointer_type(Type::make_void_type()); | |
17611 | mparams->push_back(Typed_identifier("", vt, ft->location())); | |
17612 | if (params != NULL) | |
17613 | { | |
17614 | for (Typed_identifier_list::const_iterator pp = params->begin(); | |
17615 | pp != params->end(); | |
17616 | ++pp) | |
17617 | mparams->push_back(*pp); | |
17618 | } | |
17619 | ||
17620 | Typed_identifier_list* mresults = (ft->results() == NULL | |
17621 | ? NULL | |
17622 | : ft->results()->copy()); | |
17623 | Backend_function_type* mft = | |
17624 | Type::make_backend_function_type(NULL, mparams, mresults, | |
17625 | ft->location()); | |
17626 | ||
17627 | std::string fname = Gogo::unpack_hidden_name(p->name()); | |
17628 | sfl->push_back(Struct_field(Typed_identifier(fname, mft, loc))); | |
17629 | } | |
17630 | ||
6bf4793c | 17631 | Struct_type* st = Type::make_struct_type(sfl, loc); |
17632 | st->set_is_struct_incomparable(); | |
17633 | Pointer_type *pt = Type::make_pointer_type(st); | |
625d3118 | 17634 | result_types[itype] = pt; |
17635 | return pt; | |
2387f644 | 17636 | } |
17637 | case INTERFACE_INFO_OBJECT: | |
17638 | return Type::make_pointer_type(Type::make_void_type()); | |
17639 | default: | |
17640 | go_unreachable(); | |
17641 | } | |
17642 | } | |
17643 | ||
ea664253 | 17644 | // Return the backend representation for interface information. |
2387f644 | 17645 | |
ea664253 | 17646 | Bexpression* |
17647 | Interface_info_expression::do_get_backend(Translate_context* context) | |
2387f644 | 17648 | { |
17649 | Gogo* gogo = context->gogo(); | |
ea664253 | 17650 | Bexpression* biface = this->iface_->get_backend(context); |
2387f644 | 17651 | switch (this->iface_info_) |
17652 | { | |
17653 | case INTERFACE_INFO_METHODS: | |
17654 | case INTERFACE_INFO_OBJECT: | |
ea664253 | 17655 | return gogo->backend()->struct_field_expression(biface, this->iface_info_, |
17656 | this->location()); | |
2387f644 | 17657 | break; |
17658 | default: | |
17659 | go_unreachable(); | |
17660 | } | |
2387f644 | 17661 | } |
17662 | ||
17663 | // Dump ast representation for an interface info expression. | |
17664 | ||
17665 | void | |
17666 | Interface_info_expression::do_dump_expression( | |
17667 | Ast_dump_context* ast_dump_context) const | |
17668 | { | |
2c809f8f | 17669 | bool is_empty = this->iface_->type()->interface_type()->is_empty(); |
2387f644 | 17670 | ast_dump_context->ostream() << "interfaceinfo("; |
17671 | this->iface_->dump_expression(ast_dump_context); | |
17672 | ast_dump_context->ostream() << ","; | |
17673 | ast_dump_context->ostream() << | |
2c809f8f | 17674 | (this->iface_info_ == INTERFACE_INFO_METHODS && !is_empty ? "methods" |
17675 | : this->iface_info_ == INTERFACE_INFO_TYPE_DESCRIPTOR ? "type_descriptor" | |
2387f644 | 17676 | : this->iface_info_ == INTERFACE_INFO_OBJECT ? "object" |
17677 | : "unknown"); | |
17678 | ast_dump_context->ostream() << ")"; | |
17679 | } | |
17680 | ||
17681 | // Make an interface info expression. | |
17682 | ||
17683 | Expression* | |
17684 | Expression::make_interface_info(Expression* iface, Interface_info iface_info, | |
17685 | Location location) | |
17686 | { | |
17687 | return new Interface_info_expression(iface, iface_info, location); | |
17688 | } | |
17689 | ||
2c809f8f | 17690 | // An expression that represents an interface value. The first field is either |
17691 | // a type descriptor for an empty interface or a pointer to the interface method | |
17692 | // table for a non-empty interface. The second field is always the object. | |
17693 | ||
17694 | class Interface_value_expression : public Expression | |
17695 | { | |
17696 | public: | |
17697 | Interface_value_expression(Type* type, Expression* first_field, | |
17698 | Expression* obj, Location location) | |
17699 | : Expression(EXPRESSION_INTERFACE_VALUE, location), | |
17700 | type_(type), first_field_(first_field), obj_(obj) | |
17701 | { } | |
17702 | ||
17703 | protected: | |
17704 | int | |
17705 | do_traverse(Traverse*); | |
17706 | ||
17707 | Type* | |
17708 | do_type() | |
17709 | { return this->type_; } | |
17710 | ||
17711 | void | |
17712 | do_determine_type(const Type_context*) | |
17713 | { go_unreachable(); } | |
17714 | ||
17715 | Expression* | |
17716 | do_copy() | |
17717 | { | |
de590a61 | 17718 | return new Interface_value_expression(this->type_->copy_expressions(), |
2c809f8f | 17719 | this->first_field_->copy(), |
17720 | this->obj_->copy(), this->location()); | |
17721 | } | |
17722 | ||
ea664253 | 17723 | Bexpression* |
17724 | do_get_backend(Translate_context* context); | |
2c809f8f | 17725 | |
17726 | void | |
17727 | do_dump_expression(Ast_dump_context*) const; | |
17728 | ||
17729 | private: | |
17730 | // The type of the interface value. | |
17731 | Type* type_; | |
17732 | // The first field of the interface (either a type descriptor or a pointer | |
17733 | // to the method table. | |
17734 | Expression* first_field_; | |
17735 | // The underlying object of the interface. | |
17736 | Expression* obj_; | |
17737 | }; | |
17738 | ||
17739 | int | |
17740 | Interface_value_expression::do_traverse(Traverse* traverse) | |
17741 | { | |
17742 | if (Expression::traverse(&this->first_field_, traverse) == TRAVERSE_EXIT | |
17743 | || Expression::traverse(&this->obj_, traverse) == TRAVERSE_EXIT) | |
17744 | return TRAVERSE_EXIT; | |
17745 | return TRAVERSE_CONTINUE; | |
17746 | } | |
17747 | ||
ea664253 | 17748 | Bexpression* |
17749 | Interface_value_expression::do_get_backend(Translate_context* context) | |
2c809f8f | 17750 | { |
17751 | std::vector<Bexpression*> vals(2); | |
ea664253 | 17752 | vals[0] = this->first_field_->get_backend(context); |
17753 | vals[1] = this->obj_->get_backend(context); | |
2c809f8f | 17754 | |
17755 | Gogo* gogo = context->gogo(); | |
17756 | Btype* btype = this->type_->get_backend(gogo); | |
ea664253 | 17757 | return gogo->backend()->constructor_expression(btype, vals, this->location()); |
2c809f8f | 17758 | } |
17759 | ||
17760 | void | |
17761 | Interface_value_expression::do_dump_expression( | |
17762 | Ast_dump_context* ast_dump_context) const | |
17763 | { | |
17764 | ast_dump_context->ostream() << "interfacevalue("; | |
17765 | ast_dump_context->ostream() << | |
17766 | (this->type_->interface_type()->is_empty() | |
17767 | ? "type_descriptor: " | |
17768 | : "methods: "); | |
17769 | this->first_field_->dump_expression(ast_dump_context); | |
17770 | ast_dump_context->ostream() << ", object: "; | |
17771 | this->obj_->dump_expression(ast_dump_context); | |
17772 | ast_dump_context->ostream() << ")"; | |
17773 | } | |
17774 | ||
17775 | Expression* | |
17776 | Expression::make_interface_value(Type* type, Expression* first_value, | |
17777 | Expression* object, Location location) | |
17778 | { | |
17779 | return new Interface_value_expression(type, first_value, object, location); | |
17780 | } | |
17781 | ||
17782 | // An interface method table for a pair of types: an interface type and a type | |
17783 | // that implements that interface. | |
17784 | ||
17785 | class Interface_mtable_expression : public Expression | |
17786 | { | |
17787 | public: | |
17788 | Interface_mtable_expression(Interface_type* itype, Type* type, | |
17789 | bool is_pointer, Location location) | |
17790 | : Expression(EXPRESSION_INTERFACE_MTABLE, location), | |
17791 | itype_(itype), type_(type), is_pointer_(is_pointer), | |
17792 | method_table_type_(NULL), bvar_(NULL) | |
17793 | { } | |
17794 | ||
17795 | protected: | |
17796 | int | |
17797 | do_traverse(Traverse*); | |
17798 | ||
17799 | Type* | |
17800 | do_type(); | |
17801 | ||
17802 | bool | |
3ae06f68 | 17803 | do_is_static_initializer() const |
2c809f8f | 17804 | { return true; } |
17805 | ||
17806 | void | |
17807 | do_determine_type(const Type_context*) | |
17808 | { go_unreachable(); } | |
17809 | ||
17810 | Expression* | |
17811 | do_copy() | |
17812 | { | |
de590a61 | 17813 | Interface_type* itype = this->itype_->copy_expressions()->interface_type(); |
17814 | return new Interface_mtable_expression(itype, | |
17815 | this->type_->copy_expressions(), | |
2c809f8f | 17816 | this->is_pointer_, this->location()); |
17817 | } | |
17818 | ||
17819 | bool | |
17820 | do_is_addressable() const | |
17821 | { return true; } | |
17822 | ||
ea664253 | 17823 | Bexpression* |
17824 | do_get_backend(Translate_context* context); | |
2c809f8f | 17825 | |
17826 | void | |
17827 | do_dump_expression(Ast_dump_context*) const; | |
17828 | ||
17829 | private: | |
17830 | // The interface type for which the methods are defined. | |
17831 | Interface_type* itype_; | |
17832 | // The type to construct the interface method table for. | |
17833 | Type* type_; | |
17834 | // Whether this table contains the method set for the receiver type or the | |
17835 | // pointer receiver type. | |
17836 | bool is_pointer_; | |
17837 | // The type of the method table. | |
17838 | Type* method_table_type_; | |
17839 | // The backend variable that refers to the interface method table. | |
17840 | Bvariable* bvar_; | |
17841 | }; | |
17842 | ||
17843 | int | |
17844 | Interface_mtable_expression::do_traverse(Traverse* traverse) | |
17845 | { | |
17846 | if (Type::traverse(this->itype_, traverse) == TRAVERSE_EXIT | |
17847 | || Type::traverse(this->type_, traverse) == TRAVERSE_EXIT) | |
17848 | return TRAVERSE_EXIT; | |
17849 | return TRAVERSE_CONTINUE; | |
17850 | } | |
17851 | ||
17852 | Type* | |
17853 | Interface_mtable_expression::do_type() | |
17854 | { | |
17855 | if (this->method_table_type_ != NULL) | |
17856 | return this->method_table_type_; | |
17857 | ||
17858 | const Typed_identifier_list* interface_methods = this->itype_->methods(); | |
17859 | go_assert(!interface_methods->empty()); | |
17860 | ||
17861 | Struct_field_list* sfl = new Struct_field_list; | |
17862 | Typed_identifier tid("__type_descriptor", Type::make_type_descriptor_ptr_type(), | |
17863 | this->location()); | |
17864 | sfl->push_back(Struct_field(tid)); | |
db122cb9 | 17865 | Type* unsafe_ptr_type = Type::make_pointer_type(Type::make_void_type()); |
2c809f8f | 17866 | for (Typed_identifier_list::const_iterator p = interface_methods->begin(); |
17867 | p != interface_methods->end(); | |
17868 | ++p) | |
db122cb9 | 17869 | { |
17870 | // We want C function pointers here, not func descriptors; model | |
17871 | // using void* pointers. | |
17872 | Typed_identifier method(p->name(), unsafe_ptr_type, p->location()); | |
17873 | sfl->push_back(Struct_field(method)); | |
17874 | } | |
6bf4793c | 17875 | Struct_type* st = Type::make_struct_type(sfl, this->location()); |
17876 | st->set_is_struct_incomparable(); | |
17877 | this->method_table_type_ = st; | |
2c809f8f | 17878 | return this->method_table_type_; |
17879 | } | |
17880 | ||
ea664253 | 17881 | Bexpression* |
17882 | Interface_mtable_expression::do_get_backend(Translate_context* context) | |
2c809f8f | 17883 | { |
17884 | Gogo* gogo = context->gogo(); | |
2c809f8f | 17885 | Location loc = Linemap::predeclared_location(); |
17886 | if (this->bvar_ != NULL) | |
7af8e400 | 17887 | return gogo->backend()->var_expression(this->bvar_, this->location()); |
2c809f8f | 17888 | |
17889 | const Typed_identifier_list* interface_methods = this->itype_->methods(); | |
17890 | go_assert(!interface_methods->empty()); | |
17891 | ||
19272321 | 17892 | std::string mangled_name = |
17893 | gogo->interface_method_table_name(this->itype_, this->type_, | |
17894 | this->is_pointer_); | |
2c809f8f | 17895 | |
1530c754 | 17896 | // Set is_public if we are converting a named type to an interface |
17897 | // type that is defined in the same package as the named type, and | |
17898 | // the interface has hidden methods. In that case the interface | |
17899 | // method table will be defined by the package that defines the | |
17900 | // types. | |
17901 | bool is_public = false; | |
17902 | if (this->type_->named_type() != NULL | |
17903 | && (this->type_->named_type()->named_object()->package() | |
17904 | == this->itype_->package())) | |
17905 | { | |
17906 | for (Typed_identifier_list::const_iterator p = interface_methods->begin(); | |
17907 | p != interface_methods->end(); | |
17908 | ++p) | |
2c809f8f | 17909 | { |
1530c754 | 17910 | if (Gogo::is_hidden_name(p->name())) |
17911 | { | |
17912 | is_public = true; | |
17913 | break; | |
17914 | } | |
2c809f8f | 17915 | } |
17916 | } | |
17917 | ||
1530c754 | 17918 | if (is_public |
2c809f8f | 17919 | && this->type_->named_type()->named_object()->package() != NULL) |
17920 | { | |
1530c754 | 17921 | // The interface conversion table is defined elsewhere. |
2c809f8f | 17922 | Btype* btype = this->type()->get_backend(gogo); |
438b4bec | 17923 | std::string asm_name(go_selectively_encode_id(mangled_name)); |
2c809f8f | 17924 | this->bvar_ = |
438b4bec | 17925 | gogo->backend()->immutable_struct_reference(mangled_name, asm_name, |
17926 | btype, loc); | |
7af8e400 | 17927 | return gogo->backend()->var_expression(this->bvar_, this->location()); |
2c809f8f | 17928 | } |
17929 | ||
17930 | // The first element is the type descriptor. | |
17931 | Type* td_type; | |
17932 | if (!this->is_pointer_) | |
17933 | td_type = this->type_; | |
17934 | else | |
17935 | td_type = Type::make_pointer_type(this->type_); | |
17936 | ||
db122cb9 | 17937 | std::vector<Backend::Btyped_identifier> bstructfields; |
17938 | ||
2c809f8f | 17939 | // Build an interface method table for a type: a type descriptor followed by a |
17940 | // list of function pointers, one for each interface method. This is used for | |
17941 | // interfaces. | |
17942 | Expression_list* svals = new Expression_list(); | |
db122cb9 | 17943 | Expression* tdescriptor = Expression::make_type_descriptor(td_type, loc); |
17944 | svals->push_back(tdescriptor); | |
17945 | ||
17946 | Btype* tdesc_btype = tdescriptor->type()->get_backend(gogo); | |
17947 | Backend::Btyped_identifier btd("_type", tdesc_btype, loc); | |
17948 | bstructfields.push_back(btd); | |
2c809f8f | 17949 | |
17950 | Named_type* nt = this->type_->named_type(); | |
17951 | Struct_type* st = this->type_->struct_type(); | |
17952 | go_assert(nt != NULL || st != NULL); | |
17953 | ||
17954 | for (Typed_identifier_list::const_iterator p = interface_methods->begin(); | |
17955 | p != interface_methods->end(); | |
17956 | ++p) | |
17957 | { | |
17958 | bool is_ambiguous; | |
17959 | Method* m; | |
17960 | if (nt != NULL) | |
17961 | m = nt->method_function(p->name(), &is_ambiguous); | |
17962 | else | |
17963 | m = st->method_function(p->name(), &is_ambiguous); | |
17964 | go_assert(m != NULL); | |
5b665222 | 17965 | Named_object* no = |
17966 | (this->is_pointer_ | |
17967 | && this->type_->is_direct_iface_type() | |
17968 | && m->is_value_method() | |
17969 | ? m->iface_stub_object() | |
17970 | : m->named_object()); | |
2c809f8f | 17971 | |
17972 | go_assert(no->is_function() || no->is_function_declaration()); | |
db122cb9 | 17973 | |
5b665222 | 17974 | Function_type* fcn_type = (no->is_function() |
17975 | ? no->func_value()->type() | |
17976 | : no->func_declaration_value()->type()); | |
17977 | Btype* fcn_btype = fcn_type->get_backend_fntype(gogo); | |
db122cb9 | 17978 | Backend::Btyped_identifier bmtype(p->name(), fcn_btype, loc); |
17979 | bstructfields.push_back(bmtype); | |
17980 | ||
2c809f8f | 17981 | svals->push_back(Expression::make_func_code_reference(no, loc)); |
17982 | } | |
17983 | ||
db122cb9 | 17984 | Btype *btype = gogo->backend()->struct_type(bstructfields); |
17985 | std::vector<Bexpression*> ctor_bexprs; | |
17986 | for (Expression_list::const_iterator pe = svals->begin(); | |
17987 | pe != svals->end(); | |
17988 | ++pe) | |
17989 | { | |
17990 | ctor_bexprs.push_back((*pe)->get_backend(context)); | |
17991 | } | |
17992 | Bexpression* ctor = | |
17993 | gogo->backend()->constructor_expression(btype, ctor_bexprs, loc); | |
2c809f8f | 17994 | |
438b4bec | 17995 | std::string asm_name(go_selectively_encode_id(mangled_name)); |
17996 | this->bvar_ = gogo->backend()->immutable_struct(mangled_name, asm_name, false, | |
2c809f8f | 17997 | !is_public, btype, loc); |
17998 | gogo->backend()->immutable_struct_set_init(this->bvar_, mangled_name, false, | |
17999 | !is_public, btype, loc, ctor); | |
7af8e400 | 18000 | return gogo->backend()->var_expression(this->bvar_, loc); |
2c809f8f | 18001 | } |
18002 | ||
18003 | void | |
18004 | Interface_mtable_expression::do_dump_expression( | |
18005 | Ast_dump_context* ast_dump_context) const | |
18006 | { | |
18007 | ast_dump_context->ostream() << "__go_" | |
18008 | << (this->is_pointer_ ? "pimt__" : "imt_"); | |
18009 | ast_dump_context->dump_type(this->itype_); | |
18010 | ast_dump_context->ostream() << "__"; | |
18011 | ast_dump_context->dump_type(this->type_); | |
18012 | } | |
18013 | ||
18014 | Expression* | |
18015 | Expression::make_interface_mtable_ref(Interface_type* itype, Type* type, | |
18016 | bool is_pointer, Location location) | |
18017 | { | |
18018 | return new Interface_mtable_expression(itype, type, is_pointer, location); | |
18019 | } | |
18020 | ||
e440a328 | 18021 | // An expression which evaluates to the offset of a field within a |
18022 | // struct. This, like Type_info_expression, q.v., is only used to | |
18023 | // initialize fields of a type descriptor. | |
18024 | ||
18025 | class Struct_field_offset_expression : public Expression | |
18026 | { | |
18027 | public: | |
18028 | Struct_field_offset_expression(Struct_type* type, const Struct_field* field) | |
b13c66cd | 18029 | : Expression(EXPRESSION_STRUCT_FIELD_OFFSET, |
18030 | Linemap::predeclared_location()), | |
e440a328 | 18031 | type_(type), field_(field) |
18032 | { } | |
18033 | ||
18034 | protected: | |
f23d7786 | 18035 | bool |
3ae06f68 | 18036 | do_is_static_initializer() const |
f23d7786 | 18037 | { return true; } |
18038 | ||
e440a328 | 18039 | Type* |
18040 | do_type() | |
18041 | { return Type::lookup_integer_type("uintptr"); } | |
18042 | ||
18043 | void | |
18044 | do_determine_type(const Type_context*) | |
18045 | { } | |
18046 | ||
18047 | Expression* | |
18048 | do_copy() | |
18049 | { return this; } | |
18050 | ||
ea664253 | 18051 | Bexpression* |
18052 | do_get_backend(Translate_context* context); | |
e440a328 | 18053 | |
d751bb78 | 18054 | void |
18055 | do_dump_expression(Ast_dump_context*) const; | |
f03a9fbf | 18056 | |
e440a328 | 18057 | private: |
18058 | // The type of the struct. | |
18059 | Struct_type* type_; | |
18060 | // The field. | |
18061 | const Struct_field* field_; | |
18062 | }; | |
18063 | ||
ea664253 | 18064 | // Return the backend representation for a struct field offset. |
e440a328 | 18065 | |
ea664253 | 18066 | Bexpression* |
18067 | Struct_field_offset_expression::do_get_backend(Translate_context* context) | |
e440a328 | 18068 | { |
e440a328 | 18069 | const Struct_field_list* fields = this->type_->fields(); |
e440a328 | 18070 | Struct_field_list::const_iterator p; |
2c8bda43 | 18071 | unsigned i = 0; |
e440a328 | 18072 | for (p = fields->begin(); |
18073 | p != fields->end(); | |
2c8bda43 | 18074 | ++p, ++i) |
18075 | if (&*p == this->field_) | |
18076 | break; | |
c484d925 | 18077 | go_assert(&*p == this->field_); |
e440a328 | 18078 | |
2c8bda43 | 18079 | Gogo* gogo = context->gogo(); |
18080 | Btype* btype = this->type_->get_backend(gogo); | |
18081 | ||
3f378015 | 18082 | int64_t offset = gogo->backend()->type_field_offset(btype, i); |
2c8bda43 | 18083 | Type* uptr_type = Type::lookup_integer_type("uintptr"); |
e67508fa | 18084 | Expression* ret = |
3f378015 | 18085 | Expression::make_integer_int64(offset, uptr_type, |
18086 | Linemap::predeclared_location()); | |
ea664253 | 18087 | return ret->get_backend(context); |
e440a328 | 18088 | } |
18089 | ||
d751bb78 | 18090 | // Dump ast representation for a struct field offset expression. |
18091 | ||
18092 | void | |
18093 | Struct_field_offset_expression::do_dump_expression( | |
18094 | Ast_dump_context* ast_dump_context) const | |
18095 | { | |
18096 | ast_dump_context->ostream() << "unsafe.Offsetof("; | |
2d29d278 | 18097 | ast_dump_context->dump_type(this->type_); |
18098 | ast_dump_context->ostream() << '.'; | |
18099 | ast_dump_context->ostream() << | |
18100 | Gogo::message_name(this->field_->field_name()); | |
d751bb78 | 18101 | ast_dump_context->ostream() << ")"; |
18102 | } | |
18103 | ||
e440a328 | 18104 | // Make an expression for a struct field offset. |
18105 | ||
18106 | Expression* | |
18107 | Expression::make_struct_field_offset(Struct_type* type, | |
18108 | const Struct_field* field) | |
18109 | { | |
18110 | return new Struct_field_offset_expression(type, field); | |
18111 | } | |
18112 | ||
18113 | // An expression which evaluates to the address of an unnamed label. | |
18114 | ||
18115 | class Label_addr_expression : public Expression | |
18116 | { | |
18117 | public: | |
b13c66cd | 18118 | Label_addr_expression(Label* label, Location location) |
e440a328 | 18119 | : Expression(EXPRESSION_LABEL_ADDR, location), |
18120 | label_(label) | |
18121 | { } | |
18122 | ||
18123 | protected: | |
18124 | Type* | |
18125 | do_type() | |
18126 | { return Type::make_pointer_type(Type::make_void_type()); } | |
18127 | ||
18128 | void | |
18129 | do_determine_type(const Type_context*) | |
18130 | { } | |
18131 | ||
18132 | Expression* | |
18133 | do_copy() | |
18134 | { return new Label_addr_expression(this->label_, this->location()); } | |
18135 | ||
ea664253 | 18136 | Bexpression* |
18137 | do_get_backend(Translate_context* context) | |
18138 | { return this->label_->get_addr(context, this->location()); } | |
e440a328 | 18139 | |
d751bb78 | 18140 | void |
18141 | do_dump_expression(Ast_dump_context* ast_dump_context) const | |
18142 | { ast_dump_context->ostream() << this->label_->name(); } | |
f03a9fbf | 18143 | |
e440a328 | 18144 | private: |
18145 | // The label whose address we are taking. | |
18146 | Label* label_; | |
18147 | }; | |
18148 | ||
18149 | // Make an expression for the address of an unnamed label. | |
18150 | ||
18151 | Expression* | |
b13c66cd | 18152 | Expression::make_label_addr(Label* label, Location location) |
e440a328 | 18153 | { |
18154 | return new Label_addr_expression(label, location); | |
18155 | } | |
18156 | ||
da244e59 | 18157 | // Class Conditional_expression. |
283a177b | 18158 | |
2c809f8f | 18159 | // Traversal. |
18160 | ||
18161 | int | |
18162 | Conditional_expression::do_traverse(Traverse* traverse) | |
18163 | { | |
18164 | if (Expression::traverse(&this->cond_, traverse) == TRAVERSE_EXIT | |
18165 | || Expression::traverse(&this->then_, traverse) == TRAVERSE_EXIT | |
18166 | || Expression::traverse(&this->else_, traverse) == TRAVERSE_EXIT) | |
18167 | return TRAVERSE_EXIT; | |
18168 | return TRAVERSE_CONTINUE; | |
18169 | } | |
18170 | ||
283a177b | 18171 | // Return the type of the conditional expression. |
18172 | ||
18173 | Type* | |
18174 | Conditional_expression::do_type() | |
18175 | { | |
18176 | Type* result_type = Type::make_void_type(); | |
3a522dcc | 18177 | if (Type::are_identical(this->then_->type(), this->else_->type(), |
18178 | Type::COMPARE_ERRORS | Type::COMPARE_TAGS, | |
2c809f8f | 18179 | NULL)) |
283a177b | 18180 | result_type = this->then_->type(); |
18181 | else if (this->then_->is_nil_expression() | |
18182 | || this->else_->is_nil_expression()) | |
18183 | result_type = (!this->then_->is_nil_expression() | |
18184 | ? this->then_->type() | |
18185 | : this->else_->type()); | |
18186 | return result_type; | |
18187 | } | |
18188 | ||
2c809f8f | 18189 | // Determine type for a conditional expression. |
18190 | ||
18191 | void | |
18192 | Conditional_expression::do_determine_type(const Type_context* context) | |
18193 | { | |
18194 | this->cond_->determine_type_no_context(); | |
18195 | this->then_->determine_type(context); | |
18196 | this->else_->determine_type(context); | |
18197 | } | |
18198 | ||
283a177b | 18199 | // Get the backend representation of a conditional expression. |
18200 | ||
ea664253 | 18201 | Bexpression* |
18202 | Conditional_expression::do_get_backend(Translate_context* context) | |
283a177b | 18203 | { |
18204 | Gogo* gogo = context->gogo(); | |
18205 | Btype* result_btype = this->type()->get_backend(gogo); | |
ea664253 | 18206 | Bexpression* cond = this->cond_->get_backend(context); |
18207 | Bexpression* then = this->then_->get_backend(context); | |
18208 | Bexpression* belse = this->else_->get_backend(context); | |
93715b75 | 18209 | Bfunction* bfn = context->function()->func_value()->get_decl(); |
18210 | return gogo->backend()->conditional_expression(bfn, result_btype, cond, then, | |
ea664253 | 18211 | belse, this->location()); |
283a177b | 18212 | } |
18213 | ||
18214 | // Dump ast representation of a conditional expression. | |
18215 | ||
18216 | void | |
18217 | Conditional_expression::do_dump_expression( | |
18218 | Ast_dump_context* ast_dump_context) const | |
18219 | { | |
18220 | ast_dump_context->ostream() << "("; | |
18221 | ast_dump_context->dump_expression(this->cond_); | |
18222 | ast_dump_context->ostream() << " ? "; | |
18223 | ast_dump_context->dump_expression(this->then_); | |
18224 | ast_dump_context->ostream() << " : "; | |
18225 | ast_dump_context->dump_expression(this->else_); | |
18226 | ast_dump_context->ostream() << ") "; | |
18227 | } | |
18228 | ||
18229 | // Make a conditional expression. | |
18230 | ||
18231 | Expression* | |
18232 | Expression::make_conditional(Expression* cond, Expression* then, | |
18233 | Expression* else_expr, Location location) | |
18234 | { | |
18235 | return new Conditional_expression(cond, then, else_expr, location); | |
18236 | } | |
18237 | ||
da244e59 | 18238 | // Class Compound_expression. |
2c809f8f | 18239 | |
18240 | // Traversal. | |
18241 | ||
18242 | int | |
18243 | Compound_expression::do_traverse(Traverse* traverse) | |
18244 | { | |
18245 | if (Expression::traverse(&this->init_, traverse) == TRAVERSE_EXIT | |
18246 | || Expression::traverse(&this->expr_, traverse) == TRAVERSE_EXIT) | |
18247 | return TRAVERSE_EXIT; | |
18248 | return TRAVERSE_CONTINUE; | |
18249 | } | |
18250 | ||
18251 | // Return the type of the compound expression. | |
18252 | ||
18253 | Type* | |
18254 | Compound_expression::do_type() | |
18255 | { | |
18256 | return this->expr_->type(); | |
18257 | } | |
18258 | ||
18259 | // Determine type for a compound expression. | |
18260 | ||
18261 | void | |
18262 | Compound_expression::do_determine_type(const Type_context* context) | |
18263 | { | |
18264 | this->init_->determine_type_no_context(); | |
18265 | this->expr_->determine_type(context); | |
18266 | } | |
18267 | ||
18268 | // Get the backend representation of a compound expression. | |
18269 | ||
ea664253 | 18270 | Bexpression* |
18271 | Compound_expression::do_get_backend(Translate_context* context) | |
2c809f8f | 18272 | { |
18273 | Gogo* gogo = context->gogo(); | |
ea664253 | 18274 | Bexpression* binit = this->init_->get_backend(context); |
0ab48656 | 18275 | Bfunction* bfunction = context->function()->func_value()->get_decl(); |
18276 | Bstatement* init_stmt = gogo->backend()->expression_statement(bfunction, | |
18277 | binit); | |
ea664253 | 18278 | Bexpression* bexpr = this->expr_->get_backend(context); |
18279 | return gogo->backend()->compound_expression(init_stmt, bexpr, | |
18280 | this->location()); | |
2c809f8f | 18281 | } |
18282 | ||
18283 | // Dump ast representation of a conditional expression. | |
18284 | ||
18285 | void | |
18286 | Compound_expression::do_dump_expression( | |
18287 | Ast_dump_context* ast_dump_context) const | |
18288 | { | |
18289 | ast_dump_context->ostream() << "("; | |
18290 | ast_dump_context->dump_expression(this->init_); | |
18291 | ast_dump_context->ostream() << ","; | |
18292 | ast_dump_context->dump_expression(this->expr_); | |
18293 | ast_dump_context->ostream() << ") "; | |
18294 | } | |
18295 | ||
18296 | // Make a compound expression. | |
18297 | ||
18298 | Expression* | |
18299 | Expression::make_compound(Expression* init, Expression* expr, Location location) | |
18300 | { | |
18301 | return new Compound_expression(init, expr, location); | |
18302 | } | |
18303 | ||
1b4fb1e0 | 18304 | // Class Backend_expression. |
18305 | ||
18306 | int | |
18307 | Backend_expression::do_traverse(Traverse*) | |
18308 | { | |
18309 | return TRAVERSE_CONTINUE; | |
18310 | } | |
18311 | ||
de590a61 | 18312 | Expression* |
18313 | Backend_expression::do_copy() | |
18314 | { | |
18315 | return new Backend_expression(this->bexpr_, this->type_->copy_expressions(), | |
18316 | this->location()); | |
18317 | } | |
18318 | ||
1b4fb1e0 | 18319 | void |
18320 | Backend_expression::do_dump_expression(Ast_dump_context* ast_dump_context) const | |
18321 | { | |
18322 | ast_dump_context->ostream() << "backend_expression<"; | |
18323 | ast_dump_context->dump_type(this->type_); | |
18324 | ast_dump_context->ostream() << ">"; | |
18325 | } | |
18326 | ||
18327 | Expression* | |
18328 | Expression::make_backend(Bexpression* bexpr, Type* type, Location location) | |
18329 | { | |
18330 | return new Backend_expression(bexpr, type, location); | |
18331 | } | |
18332 | ||
e440a328 | 18333 | // Import an expression. This comes at the end in order to see the |
18334 | // various class definitions. | |
18335 | ||
18336 | Expression* | |
bc8e2ef4 | 18337 | Expression::import_expression(Import_expression* imp, Location loc) |
e3d09834 | 18338 | { |
18339 | Expression* expr = Expression::import_expression_without_suffix(imp, loc); | |
18340 | while (true) | |
18341 | { | |
18342 | if (imp->match_c_string("(")) | |
18343 | { | |
18344 | imp->advance(1); | |
18345 | Expression_list* args = new Expression_list(); | |
18346 | bool is_varargs = false; | |
18347 | while (!imp->match_c_string(")")) | |
18348 | { | |
18349 | Expression* arg = Expression::import_expression(imp, loc); | |
18350 | if (arg->is_error_expression()) | |
18351 | return arg; | |
18352 | args->push_back(arg); | |
18353 | if (imp->match_c_string(")")) | |
18354 | break; | |
18355 | else if (imp->match_c_string("...)")) | |
18356 | { | |
18357 | imp->advance(3); | |
18358 | is_varargs = true; | |
18359 | break; | |
18360 | } | |
18361 | imp->require_c_string(", "); | |
18362 | } | |
18363 | imp->require_c_string(")"); | |
18364 | expr = Expression::make_call(expr, args, is_varargs, loc); | |
431a858a | 18365 | expr->call_expression()->set_varargs_are_lowered(); |
e3d09834 | 18366 | } |
171fd404 | 18367 | else if (imp->match_c_string("[")) |
18368 | { | |
18369 | imp->advance(1); | |
18370 | Expression* start = Expression::import_expression(imp, loc); | |
18371 | Expression* end = NULL; | |
18372 | Expression* cap = NULL; | |
18373 | if (imp->match_c_string(":")) | |
18374 | { | |
18375 | imp->advance(1); | |
18376 | int c = imp->peek_char(); | |
18377 | if (c == ':' || c == ']') | |
18378 | end = Expression::make_nil(loc); | |
18379 | else | |
18380 | end = Expression::import_expression(imp, loc); | |
18381 | if (imp->match_c_string(":")) | |
18382 | { | |
18383 | imp->advance(1); | |
18384 | cap = Expression::import_expression(imp, loc); | |
18385 | } | |
18386 | } | |
18387 | imp->require_c_string("]"); | |
18388 | expr = Expression::make_index(expr, start, end, cap, loc); | |
18389 | } | |
e3d09834 | 18390 | else |
18391 | break; | |
18392 | } | |
18393 | ||
18394 | return expr; | |
18395 | } | |
18396 | ||
18397 | // Import an expression without considering a suffix (function | |
18398 | // arguments, index operations, etc.). | |
18399 | ||
18400 | Expression* | |
18401 | Expression::import_expression_without_suffix(Import_expression* imp, | |
18402 | Location loc) | |
e440a328 | 18403 | { |
18404 | int c = imp->peek_char(); | |
5f6f5357 | 18405 | if (c == '+' || c == '-' || c == '!' || c == '^' || c == '&' || c == '*') |
9b92780c | 18406 | return Unary_expression::do_import(imp, loc); |
e440a328 | 18407 | else if (c == '(') |
9b92780c | 18408 | return Binary_expression::do_import(imp, loc); |
204d4af4 | 18409 | else if (imp->match_c_string("$true") |
18410 | || imp->match_c_string("$false") | |
18411 | || (imp->version() < EXPORT_FORMAT_V3 | |
18412 | && (imp->match_c_string("true") | |
18413 | || imp->match_c_string("false")))) | |
9b92780c | 18414 | return Boolean_expression::do_import(imp, loc); |
e440a328 | 18415 | else if (c == '"') |
9b92780c | 18416 | return String_expression::do_import(imp, loc); |
e440a328 | 18417 | else if (c == '-' || (c >= '0' && c <= '9')) |
18418 | { | |
18419 | // This handles integers, floats and complex constants. | |
9b92780c | 18420 | return Integer_expression::do_import(imp, loc); |
e440a328 | 18421 | } |
0b2617a3 | 18422 | else if (imp->match_c_string("<-")) |
18423 | return Receive_expression::do_import(imp, loc); | |
204d4af4 | 18424 | else if (imp->match_c_string("$nil") |
18425 | || (imp->version() < EXPORT_FORMAT_V3 | |
18426 | && imp->match_c_string("nil"))) | |
9b92780c | 18427 | return Nil_expression::do_import(imp, loc); |
204d4af4 | 18428 | else if (imp->match_c_string("$convert") |
18429 | || (imp->version() < EXPORT_FORMAT_V3 | |
18430 | && imp->match_c_string("convert"))) | |
9b92780c | 18431 | return Type_conversion_expression::do_import(imp, loc); |
5f6f5357 | 18432 | |
18433 | Import_function_body* ifb = imp->ifb(); | |
18434 | if (ifb == NULL) | |
e440a328 | 18435 | { |
631d5788 | 18436 | go_error_at(imp->location(), "import error: expected expression"); |
9b92780c | 18437 | return Expression::make_error(loc); |
e440a328 | 18438 | } |
5f6f5357 | 18439 | if (ifb->saw_error()) |
18440 | return Expression::make_error(loc); | |
f6492beb | 18441 | |
18442 | if (ifb->match_c_string("$t")) | |
18443 | return Temporary_reference_expression::do_import(ifb, loc); | |
18444 | ||
015399f9 | 18445 | return Expression::import_identifier(ifb, loc); |
18446 | } | |
18447 | ||
18448 | // Import an identifier in an expression. This is a reference to a | |
18449 | // variable or function. | |
18450 | ||
18451 | Expression* | |
18452 | Expression::import_identifier(Import_function_body* ifb, Location loc) | |
18453 | { | |
18454 | std::string id; | |
18455 | Package* pkg; | |
18456 | bool is_exported; | |
18457 | if (!Import::read_qualified_identifier(ifb, &id, &pkg, &is_exported)) | |
5f6f5357 | 18458 | { |
18459 | if (!ifb->saw_error()) | |
015399f9 | 18460 | go_error_at(ifb->location(), |
18461 | "import error for %qs: bad qualified identifier at %lu", | |
18462 | ifb->name().c_str(), | |
5f6f5357 | 18463 | static_cast<unsigned long>(ifb->off())); |
18464 | ifb->set_saw_error(); | |
18465 | return Expression::make_error(loc); | |
18466 | } | |
015399f9 | 18467 | |
18468 | Named_object* no = NULL; | |
18469 | if (pkg == NULL && is_exported) | |
18470 | no = ifb->block()->bindings()->lookup(id); | |
18471 | if (no == NULL) | |
18472 | { | |
18473 | const Package* ipkg = pkg; | |
18474 | if (ipkg == NULL) | |
18475 | ipkg = ifb->function()->package(); | |
18476 | if (!is_exported) | |
18477 | id = '.' + ipkg->pkgpath() + '.' + id; | |
18478 | no = ipkg->bindings()->lookup(id); | |
18479 | } | |
18480 | if (no == NULL) | |
18481 | no = ifb->gogo()->lookup_global(id.c_str()); | |
18482 | ||
18483 | if (no == NULL) | |
5f6f5357 | 18484 | { |
18485 | if (!ifb->saw_error()) | |
015399f9 | 18486 | go_error_at(ifb->location(), |
18487 | "import error for %qs: lookup of %qs failed", | |
18488 | ifb->name().c_str(), id.c_str()); | |
5f6f5357 | 18489 | ifb->set_saw_error(); |
18490 | return Expression::make_error(loc); | |
18491 | } | |
015399f9 | 18492 | |
e3d09834 | 18493 | if (no->is_variable() || no->is_result_variable()) |
18494 | return Expression::make_var_reference(no, loc); | |
18495 | else if (no->is_function() || no->is_function_declaration()) | |
18496 | return Expression::make_func_reference(no, NULL, loc); | |
18497 | else | |
18498 | { | |
18499 | if (!ifb->saw_error()) | |
18500 | go_error_at(ifb->location(), | |
18501 | ("import error for %qs: " | |
18502 | "unexpected type of identifier %qs (%d)"), | |
18503 | ifb->name().c_str(), | |
18504 | id.c_str(), no->classification()); | |
18505 | ifb->set_saw_error(); | |
18506 | return Expression::make_error(loc); | |
18507 | } | |
e440a328 | 18508 | } |
18509 | ||
18510 | // Class Expression_list. | |
18511 | ||
18512 | // Traverse the list. | |
18513 | ||
18514 | int | |
18515 | Expression_list::traverse(Traverse* traverse) | |
18516 | { | |
18517 | for (Expression_list::iterator p = this->begin(); | |
18518 | p != this->end(); | |
18519 | ++p) | |
18520 | { | |
18521 | if (*p != NULL) | |
18522 | { | |
18523 | if (Expression::traverse(&*p, traverse) == TRAVERSE_EXIT) | |
18524 | return TRAVERSE_EXIT; | |
18525 | } | |
18526 | } | |
18527 | return TRAVERSE_CONTINUE; | |
18528 | } | |
18529 | ||
18530 | // Copy the list. | |
18531 | ||
18532 | Expression_list* | |
18533 | Expression_list::copy() | |
18534 | { | |
18535 | Expression_list* ret = new Expression_list(); | |
18536 | for (Expression_list::iterator p = this->begin(); | |
18537 | p != this->end(); | |
18538 | ++p) | |
18539 | { | |
18540 | if (*p == NULL) | |
18541 | ret->push_back(NULL); | |
18542 | else | |
18543 | ret->push_back((*p)->copy()); | |
18544 | } | |
18545 | return ret; | |
18546 | } | |
18547 | ||
18548 | // Return whether an expression list has an error expression. | |
18549 | ||
18550 | bool | |
18551 | Expression_list::contains_error() const | |
18552 | { | |
18553 | for (Expression_list::const_iterator p = this->begin(); | |
18554 | p != this->end(); | |
18555 | ++p) | |
18556 | if (*p != NULL && (*p)->is_error_expression()) | |
18557 | return true; | |
18558 | return false; | |
18559 | } | |
0c77715b | 18560 | |
18561 | // Class Numeric_constant. | |
18562 | ||
18563 | // Destructor. | |
18564 | ||
18565 | Numeric_constant::~Numeric_constant() | |
18566 | { | |
18567 | this->clear(); | |
18568 | } | |
18569 | ||
18570 | // Copy constructor. | |
18571 | ||
18572 | Numeric_constant::Numeric_constant(const Numeric_constant& a) | |
18573 | : classification_(a.classification_), type_(a.type_) | |
18574 | { | |
18575 | switch (a.classification_) | |
18576 | { | |
18577 | case NC_INVALID: | |
18578 | break; | |
18579 | case NC_INT: | |
18580 | case NC_RUNE: | |
18581 | mpz_init_set(this->u_.int_val, a.u_.int_val); | |
18582 | break; | |
18583 | case NC_FLOAT: | |
18584 | mpfr_init_set(this->u_.float_val, a.u_.float_val, GMP_RNDN); | |
18585 | break; | |
18586 | case NC_COMPLEX: | |
fcbea5e4 | 18587 | mpc_init2(this->u_.complex_val, mpc_precision); |
18588 | mpc_set(this->u_.complex_val, a.u_.complex_val, MPC_RNDNN); | |
0c77715b | 18589 | break; |
18590 | default: | |
18591 | go_unreachable(); | |
18592 | } | |
18593 | } | |
18594 | ||
18595 | // Assignment operator. | |
18596 | ||
18597 | Numeric_constant& | |
18598 | Numeric_constant::operator=(const Numeric_constant& a) | |
18599 | { | |
18600 | this->clear(); | |
18601 | this->classification_ = a.classification_; | |
18602 | this->type_ = a.type_; | |
18603 | switch (a.classification_) | |
18604 | { | |
18605 | case NC_INVALID: | |
18606 | break; | |
18607 | case NC_INT: | |
18608 | case NC_RUNE: | |
18609 | mpz_init_set(this->u_.int_val, a.u_.int_val); | |
18610 | break; | |
18611 | case NC_FLOAT: | |
18612 | mpfr_init_set(this->u_.float_val, a.u_.float_val, GMP_RNDN); | |
18613 | break; | |
18614 | case NC_COMPLEX: | |
fcbea5e4 | 18615 | mpc_init2(this->u_.complex_val, mpc_precision); |
18616 | mpc_set(this->u_.complex_val, a.u_.complex_val, MPC_RNDNN); | |
0c77715b | 18617 | break; |
18618 | default: | |
18619 | go_unreachable(); | |
18620 | } | |
18621 | return *this; | |
18622 | } | |
18623 | ||
0ab32342 | 18624 | // Check equality with another numeric constant. |
18625 | ||
18626 | bool | |
18627 | Numeric_constant::equals(const Numeric_constant& a) const | |
18628 | { | |
18629 | if (this->classification_ != a.classification_) | |
18630 | return false; | |
18631 | ||
18632 | if (this->type_ != NULL && a.type_ != NULL | |
18633 | && !Type::are_identical(this->type_, a.type_, | |
18634 | Type::COMPARE_ALIASES, NULL)) | |
18635 | return false; | |
18636 | ||
18637 | switch (a.classification_) | |
18638 | { | |
18639 | case NC_INVALID: | |
18640 | break; | |
18641 | case NC_INT: | |
18642 | case NC_RUNE: | |
18643 | return mpz_cmp(this->u_.int_val, a.u_.int_val) == 0; | |
18644 | case NC_FLOAT: | |
18645 | return mpfr_cmp(this->u_.float_val, a.u_.float_val) == 0; | |
18646 | case NC_COMPLEX: | |
18647 | return mpc_cmp(this->u_.complex_val, a.u_.complex_val) == 0; | |
18648 | default: | |
18649 | go_unreachable(); | |
18650 | } | |
18651 | return false; | |
18652 | } | |
18653 | ||
0c77715b | 18654 | // Clear the contents. |
18655 | ||
18656 | void | |
18657 | Numeric_constant::clear() | |
18658 | { | |
18659 | switch (this->classification_) | |
18660 | { | |
18661 | case NC_INVALID: | |
18662 | break; | |
18663 | case NC_INT: | |
18664 | case NC_RUNE: | |
18665 | mpz_clear(this->u_.int_val); | |
18666 | break; | |
18667 | case NC_FLOAT: | |
18668 | mpfr_clear(this->u_.float_val); | |
18669 | break; | |
18670 | case NC_COMPLEX: | |
fcbea5e4 | 18671 | mpc_clear(this->u_.complex_val); |
0c77715b | 18672 | break; |
18673 | default: | |
18674 | go_unreachable(); | |
18675 | } | |
18676 | this->classification_ = NC_INVALID; | |
18677 | } | |
18678 | ||
18679 | // Set to an unsigned long value. | |
18680 | ||
18681 | void | |
18682 | Numeric_constant::set_unsigned_long(Type* type, unsigned long val) | |
18683 | { | |
18684 | this->clear(); | |
18685 | this->classification_ = NC_INT; | |
18686 | this->type_ = type; | |
18687 | mpz_init_set_ui(this->u_.int_val, val); | |
18688 | } | |
18689 | ||
18690 | // Set to an integer value. | |
18691 | ||
18692 | void | |
18693 | Numeric_constant::set_int(Type* type, const mpz_t val) | |
18694 | { | |
18695 | this->clear(); | |
18696 | this->classification_ = NC_INT; | |
18697 | this->type_ = type; | |
18698 | mpz_init_set(this->u_.int_val, val); | |
18699 | } | |
18700 | ||
18701 | // Set to a rune value. | |
18702 | ||
18703 | void | |
18704 | Numeric_constant::set_rune(Type* type, const mpz_t val) | |
18705 | { | |
18706 | this->clear(); | |
18707 | this->classification_ = NC_RUNE; | |
18708 | this->type_ = type; | |
18709 | mpz_init_set(this->u_.int_val, val); | |
18710 | } | |
18711 | ||
18712 | // Set to a floating point value. | |
18713 | ||
18714 | void | |
18715 | Numeric_constant::set_float(Type* type, const mpfr_t val) | |
18716 | { | |
18717 | this->clear(); | |
18718 | this->classification_ = NC_FLOAT; | |
18719 | this->type_ = type; | |
d1d4ace3 | 18720 | |
833b523c | 18721 | // Numeric constants do not have negative zero values, so remove |
18722 | // them here. They also don't have infinity or NaN values, but we | |
18723 | // should never see them here. | |
d1d4ace3 | 18724 | int bits = 0; |
18725 | if (type != NULL | |
18726 | && type->float_type() != NULL | |
18727 | && !type->float_type()->is_abstract()) | |
18728 | bits = type->float_type()->bits(); | |
18729 | if (Numeric_constant::is_float_neg_zero(val, bits)) | |
833b523c | 18730 | mpfr_init_set_ui(this->u_.float_val, 0, GMP_RNDN); |
18731 | else | |
18732 | mpfr_init_set(this->u_.float_val, val, GMP_RNDN); | |
0c77715b | 18733 | } |
18734 | ||
18735 | // Set to a complex value. | |
18736 | ||
18737 | void | |
fcbea5e4 | 18738 | Numeric_constant::set_complex(Type* type, const mpc_t val) |
0c77715b | 18739 | { |
18740 | this->clear(); | |
18741 | this->classification_ = NC_COMPLEX; | |
18742 | this->type_ = type; | |
d1d4ace3 | 18743 | |
18744 | // Avoid negative zero as in set_float. | |
18745 | int bits = 0; | |
18746 | if (type != NULL | |
18747 | && type->complex_type() != NULL | |
18748 | && !type->complex_type()->is_abstract()) | |
18749 | bits = type->complex_type()->bits() / 2; | |
18750 | ||
18751 | mpfr_t real; | |
18752 | mpfr_init_set(real, mpc_realref(val), GMP_RNDN); | |
18753 | if (Numeric_constant::is_float_neg_zero(real, bits)) | |
18754 | mpfr_set_ui(real, 0, GMP_RNDN); | |
18755 | ||
18756 | mpfr_t imag; | |
18757 | mpfr_init_set(imag, mpc_imagref(val), GMP_RNDN); | |
18758 | if (Numeric_constant::is_float_neg_zero(imag, bits)) | |
18759 | mpfr_set_ui(imag, 0, GMP_RNDN); | |
18760 | ||
fcbea5e4 | 18761 | mpc_init2(this->u_.complex_val, mpc_precision); |
d1d4ace3 | 18762 | mpc_set_fr_fr(this->u_.complex_val, real, imag, MPC_RNDNN); |
18763 | ||
18764 | mpfr_clear(real); | |
18765 | mpfr_clear(imag); | |
18766 | } | |
18767 | ||
18768 | // Return whether VAL, at a precision of BITS, is a negative zero. | |
18769 | // BITS may be zero in which case it is ignored. | |
18770 | ||
18771 | bool | |
18772 | Numeric_constant::is_float_neg_zero(const mpfr_t val, int bits) | |
18773 | { | |
18774 | if (!mpfr_signbit(val)) | |
18775 | return false; | |
18776 | if (mpfr_zero_p(val)) | |
18777 | return true; | |
18778 | mp_exp_t min_exp; | |
18779 | switch (bits) | |
18780 | { | |
18781 | case 0: | |
18782 | return false; | |
18783 | case 32: | |
18784 | // In a denormalized float32 the exponent is -126, and there are | |
18785 | // 24 bits of which at least the last must be 1, so the smallest | |
18786 | // representable non-zero exponent is -126 - (24 - 1) == -149. | |
18787 | min_exp = -149; | |
18788 | break; | |
18789 | case 64: | |
18790 | // Minimum exponent is -1022, there are 53 bits. | |
18791 | min_exp = -1074; | |
18792 | break; | |
18793 | default: | |
18794 | go_unreachable(); | |
18795 | } | |
18796 | return mpfr_get_exp(val) < min_exp; | |
0c77715b | 18797 | } |
18798 | ||
18799 | // Get an int value. | |
18800 | ||
18801 | void | |
18802 | Numeric_constant::get_int(mpz_t* val) const | |
18803 | { | |
18804 | go_assert(this->is_int()); | |
18805 | mpz_init_set(*val, this->u_.int_val); | |
18806 | } | |
18807 | ||
18808 | // Get a rune value. | |
18809 | ||
18810 | void | |
18811 | Numeric_constant::get_rune(mpz_t* val) const | |
18812 | { | |
18813 | go_assert(this->is_rune()); | |
18814 | mpz_init_set(*val, this->u_.int_val); | |
18815 | } | |
18816 | ||
18817 | // Get a floating point value. | |
18818 | ||
18819 | void | |
18820 | Numeric_constant::get_float(mpfr_t* val) const | |
18821 | { | |
18822 | go_assert(this->is_float()); | |
18823 | mpfr_init_set(*val, this->u_.float_val, GMP_RNDN); | |
18824 | } | |
18825 | ||
18826 | // Get a complex value. | |
18827 | ||
18828 | void | |
fcbea5e4 | 18829 | Numeric_constant::get_complex(mpc_t* val) const |
0c77715b | 18830 | { |
18831 | go_assert(this->is_complex()); | |
fcbea5e4 | 18832 | mpc_init2(*val, mpc_precision); |
18833 | mpc_set(*val, this->u_.complex_val, MPC_RNDNN); | |
0c77715b | 18834 | } |
18835 | ||
18836 | // Express value as unsigned long if possible. | |
18837 | ||
18838 | Numeric_constant::To_unsigned_long | |
18839 | Numeric_constant::to_unsigned_long(unsigned long* val) const | |
18840 | { | |
18841 | switch (this->classification_) | |
18842 | { | |
18843 | case NC_INT: | |
18844 | case NC_RUNE: | |
18845 | return this->mpz_to_unsigned_long(this->u_.int_val, val); | |
18846 | case NC_FLOAT: | |
18847 | return this->mpfr_to_unsigned_long(this->u_.float_val, val); | |
18848 | case NC_COMPLEX: | |
fcbea5e4 | 18849 | if (!mpfr_zero_p(mpc_imagref(this->u_.complex_val))) |
0c77715b | 18850 | return NC_UL_NOTINT; |
fcbea5e4 | 18851 | return this->mpfr_to_unsigned_long(mpc_realref(this->u_.complex_val), |
18852 | val); | |
0c77715b | 18853 | default: |
18854 | go_unreachable(); | |
18855 | } | |
18856 | } | |
18857 | ||
18858 | // Express integer value as unsigned long if possible. | |
18859 | ||
18860 | Numeric_constant::To_unsigned_long | |
18861 | Numeric_constant::mpz_to_unsigned_long(const mpz_t ival, | |
18862 | unsigned long *val) const | |
18863 | { | |
18864 | if (mpz_sgn(ival) < 0) | |
18865 | return NC_UL_NEGATIVE; | |
18866 | unsigned long ui = mpz_get_ui(ival); | |
18867 | if (mpz_cmp_ui(ival, ui) != 0) | |
18868 | return NC_UL_BIG; | |
18869 | *val = ui; | |
18870 | return NC_UL_VALID; | |
18871 | } | |
18872 | ||
18873 | // Express floating point value as unsigned long if possible. | |
18874 | ||
18875 | Numeric_constant::To_unsigned_long | |
18876 | Numeric_constant::mpfr_to_unsigned_long(const mpfr_t fval, | |
18877 | unsigned long *val) const | |
18878 | { | |
18879 | if (!mpfr_integer_p(fval)) | |
18880 | return NC_UL_NOTINT; | |
18881 | mpz_t ival; | |
18882 | mpz_init(ival); | |
18883 | mpfr_get_z(ival, fval, GMP_RNDN); | |
18884 | To_unsigned_long ret = this->mpz_to_unsigned_long(ival, val); | |
18885 | mpz_clear(ival); | |
18886 | return ret; | |
18887 | } | |
18888 | ||
03118c21 | 18889 | // Express value as memory size if possible. |
18890 | ||
18891 | bool | |
18892 | Numeric_constant::to_memory_size(int64_t* val) const | |
18893 | { | |
18894 | switch (this->classification_) | |
18895 | { | |
18896 | case NC_INT: | |
18897 | case NC_RUNE: | |
18898 | return this->mpz_to_memory_size(this->u_.int_val, val); | |
18899 | case NC_FLOAT: | |
18900 | return this->mpfr_to_memory_size(this->u_.float_val, val); | |
18901 | case NC_COMPLEX: | |
18902 | if (!mpfr_zero_p(mpc_imagref(this->u_.complex_val))) | |
18903 | return false; | |
18904 | return this->mpfr_to_memory_size(mpc_realref(this->u_.complex_val), val); | |
18905 | default: | |
18906 | go_unreachable(); | |
18907 | } | |
18908 | } | |
18909 | ||
18910 | // Express integer as memory size if possible. | |
18911 | ||
18912 | bool | |
18913 | Numeric_constant::mpz_to_memory_size(const mpz_t ival, int64_t* val) const | |
18914 | { | |
18915 | if (mpz_sgn(ival) < 0) | |
18916 | return false; | |
18917 | if (mpz_fits_slong_p(ival)) | |
18918 | { | |
18919 | *val = static_cast<int64_t>(mpz_get_si(ival)); | |
18920 | return true; | |
18921 | } | |
18922 | ||
18923 | // Test >= 64, not > 64, because an int64_t can hold 63 bits of a | |
18924 | // positive value. | |
18925 | if (mpz_sizeinbase(ival, 2) >= 64) | |
18926 | return false; | |
18927 | ||
18928 | mpz_t q, r; | |
18929 | mpz_init(q); | |
18930 | mpz_init(r); | |
18931 | mpz_tdiv_q_2exp(q, ival, 32); | |
18932 | mpz_tdiv_r_2exp(r, ival, 32); | |
18933 | go_assert(mpz_fits_ulong_p(q) && mpz_fits_ulong_p(r)); | |
18934 | *val = ((static_cast<int64_t>(mpz_get_ui(q)) << 32) | |
18935 | + static_cast<int64_t>(mpz_get_ui(r))); | |
18936 | mpz_clear(r); | |
18937 | mpz_clear(q); | |
18938 | return true; | |
18939 | } | |
18940 | ||
18941 | // Express floating point value as memory size if possible. | |
18942 | ||
18943 | bool | |
18944 | Numeric_constant::mpfr_to_memory_size(const mpfr_t fval, int64_t* val) const | |
18945 | { | |
18946 | if (!mpfr_integer_p(fval)) | |
18947 | return false; | |
18948 | mpz_t ival; | |
18949 | mpz_init(ival); | |
18950 | mpfr_get_z(ival, fval, GMP_RNDN); | |
18951 | bool ret = this->mpz_to_memory_size(ival, val); | |
18952 | mpz_clear(ival); | |
18953 | return ret; | |
18954 | } | |
18955 | ||
0c77715b | 18956 | // Convert value to integer if possible. |
18957 | ||
18958 | bool | |
18959 | Numeric_constant::to_int(mpz_t* val) const | |
18960 | { | |
18961 | switch (this->classification_) | |
18962 | { | |
18963 | case NC_INT: | |
18964 | case NC_RUNE: | |
18965 | mpz_init_set(*val, this->u_.int_val); | |
18966 | return true; | |
18967 | case NC_FLOAT: | |
18968 | if (!mpfr_integer_p(this->u_.float_val)) | |
18969 | return false; | |
18970 | mpz_init(*val); | |
18971 | mpfr_get_z(*val, this->u_.float_val, GMP_RNDN); | |
18972 | return true; | |
18973 | case NC_COMPLEX: | |
fcbea5e4 | 18974 | if (!mpfr_zero_p(mpc_imagref(this->u_.complex_val)) |
18975 | || !mpfr_integer_p(mpc_realref(this->u_.complex_val))) | |
0c77715b | 18976 | return false; |
18977 | mpz_init(*val); | |
fcbea5e4 | 18978 | mpfr_get_z(*val, mpc_realref(this->u_.complex_val), GMP_RNDN); |
0c77715b | 18979 | return true; |
18980 | default: | |
18981 | go_unreachable(); | |
18982 | } | |
18983 | } | |
18984 | ||
18985 | // Convert value to floating point if possible. | |
18986 | ||
18987 | bool | |
18988 | Numeric_constant::to_float(mpfr_t* val) const | |
18989 | { | |
18990 | switch (this->classification_) | |
18991 | { | |
18992 | case NC_INT: | |
18993 | case NC_RUNE: | |
18994 | mpfr_init_set_z(*val, this->u_.int_val, GMP_RNDN); | |
18995 | return true; | |
18996 | case NC_FLOAT: | |
18997 | mpfr_init_set(*val, this->u_.float_val, GMP_RNDN); | |
18998 | return true; | |
18999 | case NC_COMPLEX: | |
fcbea5e4 | 19000 | if (!mpfr_zero_p(mpc_imagref(this->u_.complex_val))) |
0c77715b | 19001 | return false; |
fcbea5e4 | 19002 | mpfr_init_set(*val, mpc_realref(this->u_.complex_val), GMP_RNDN); |
0c77715b | 19003 | return true; |
19004 | default: | |
19005 | go_unreachable(); | |
19006 | } | |
19007 | } | |
19008 | ||
19009 | // Convert value to complex. | |
19010 | ||
19011 | bool | |
fcbea5e4 | 19012 | Numeric_constant::to_complex(mpc_t* val) const |
0c77715b | 19013 | { |
fcbea5e4 | 19014 | mpc_init2(*val, mpc_precision); |
0c77715b | 19015 | switch (this->classification_) |
19016 | { | |
19017 | case NC_INT: | |
19018 | case NC_RUNE: | |
fcbea5e4 | 19019 | mpc_set_z(*val, this->u_.int_val, MPC_RNDNN); |
0c77715b | 19020 | return true; |
19021 | case NC_FLOAT: | |
fcbea5e4 | 19022 | mpc_set_fr(*val, this->u_.float_val, MPC_RNDNN); |
0c77715b | 19023 | return true; |
19024 | case NC_COMPLEX: | |
fcbea5e4 | 19025 | mpc_set(*val, this->u_.complex_val, MPC_RNDNN); |
0c77715b | 19026 | return true; |
19027 | default: | |
19028 | go_unreachable(); | |
19029 | } | |
19030 | } | |
19031 | ||
19032 | // Get the type. | |
19033 | ||
19034 | Type* | |
19035 | Numeric_constant::type() const | |
19036 | { | |
19037 | if (this->type_ != NULL) | |
19038 | return this->type_; | |
19039 | switch (this->classification_) | |
19040 | { | |
19041 | case NC_INT: | |
19042 | return Type::make_abstract_integer_type(); | |
19043 | case NC_RUNE: | |
19044 | return Type::make_abstract_character_type(); | |
19045 | case NC_FLOAT: | |
19046 | return Type::make_abstract_float_type(); | |
19047 | case NC_COMPLEX: | |
19048 | return Type::make_abstract_complex_type(); | |
19049 | default: | |
19050 | go_unreachable(); | |
19051 | } | |
19052 | } | |
19053 | ||
19054 | // If the constant can be expressed in TYPE, then set the type of the | |
19055 | // constant to TYPE and return true. Otherwise return false, and, if | |
19056 | // ISSUE_ERROR is true, report an appropriate error message. | |
19057 | ||
19058 | bool | |
19059 | Numeric_constant::set_type(Type* type, bool issue_error, Location loc) | |
19060 | { | |
19061 | bool ret; | |
f11c2155 | 19062 | if (type == NULL || type->is_error()) |
0c77715b | 19063 | ret = true; |
19064 | else if (type->integer_type() != NULL) | |
19065 | ret = this->check_int_type(type->integer_type(), issue_error, loc); | |
19066 | else if (type->float_type() != NULL) | |
19067 | ret = this->check_float_type(type->float_type(), issue_error, loc); | |
19068 | else if (type->complex_type() != NULL) | |
19069 | ret = this->check_complex_type(type->complex_type(), issue_error, loc); | |
19070 | else | |
5706ab68 | 19071 | { |
19072 | ret = false; | |
19073 | if (issue_error) | |
19074 | go_assert(saw_errors()); | |
19075 | } | |
0c77715b | 19076 | if (ret) |
19077 | this->type_ = type; | |
19078 | return ret; | |
19079 | } | |
19080 | ||
19081 | // Check whether the constant can be expressed in an integer type. | |
19082 | ||
19083 | bool | |
19084 | Numeric_constant::check_int_type(Integer_type* type, bool issue_error, | |
71a45216 | 19085 | Location location) |
0c77715b | 19086 | { |
19087 | mpz_t val; | |
19088 | switch (this->classification_) | |
19089 | { | |
19090 | case NC_INT: | |
19091 | case NC_RUNE: | |
19092 | mpz_init_set(val, this->u_.int_val); | |
19093 | break; | |
19094 | ||
19095 | case NC_FLOAT: | |
19096 | if (!mpfr_integer_p(this->u_.float_val)) | |
19097 | { | |
19098 | if (issue_error) | |
71a45216 | 19099 | { |
631d5788 | 19100 | go_error_at(location, |
37423a84 | 19101 | "floating-point constant truncated to integer"); |
71a45216 | 19102 | this->set_invalid(); |
19103 | } | |
0c77715b | 19104 | return false; |
19105 | } | |
19106 | mpz_init(val); | |
19107 | mpfr_get_z(val, this->u_.float_val, GMP_RNDN); | |
19108 | break; | |
19109 | ||
19110 | case NC_COMPLEX: | |
fcbea5e4 | 19111 | if (!mpfr_integer_p(mpc_realref(this->u_.complex_val)) |
19112 | || !mpfr_zero_p(mpc_imagref(this->u_.complex_val))) | |
0c77715b | 19113 | { |
19114 | if (issue_error) | |
71a45216 | 19115 | { |
631d5788 | 19116 | go_error_at(location, "complex constant truncated to integer"); |
71a45216 | 19117 | this->set_invalid(); |
19118 | } | |
0c77715b | 19119 | return false; |
19120 | } | |
19121 | mpz_init(val); | |
fcbea5e4 | 19122 | mpfr_get_z(val, mpc_realref(this->u_.complex_val), GMP_RNDN); |
0c77715b | 19123 | break; |
19124 | ||
19125 | default: | |
19126 | go_unreachable(); | |
19127 | } | |
19128 | ||
19129 | bool ret; | |
19130 | if (type->is_abstract()) | |
19131 | ret = true; | |
19132 | else | |
19133 | { | |
19134 | int bits = mpz_sizeinbase(val, 2); | |
19135 | if (type->is_unsigned()) | |
19136 | { | |
19137 | // For an unsigned type we can only accept a nonnegative | |
19138 | // number, and we must be able to represents at least BITS. | |
19139 | ret = mpz_sgn(val) >= 0 && bits <= type->bits(); | |
19140 | } | |
19141 | else | |
19142 | { | |
19143 | // For a signed type we need an extra bit to indicate the | |
19144 | // sign. We have to handle the most negative integer | |
19145 | // specially. | |
19146 | ret = (bits + 1 <= type->bits() | |
19147 | || (bits <= type->bits() | |
19148 | && mpz_sgn(val) < 0 | |
19149 | && (mpz_scan1(val, 0) | |
19150 | == static_cast<unsigned long>(type->bits() - 1)) | |
19151 | && mpz_scan0(val, type->bits()) == ULONG_MAX)); | |
19152 | } | |
19153 | } | |
19154 | ||
19155 | if (!ret && issue_error) | |
71a45216 | 19156 | { |
631d5788 | 19157 | go_error_at(location, "integer constant overflow"); |
71a45216 | 19158 | this->set_invalid(); |
19159 | } | |
0c77715b | 19160 | |
19161 | return ret; | |
19162 | } | |
19163 | ||
19164 | // Check whether the constant can be expressed in a floating point | |
19165 | // type. | |
19166 | ||
19167 | bool | |
19168 | Numeric_constant::check_float_type(Float_type* type, bool issue_error, | |
d0bcce51 | 19169 | Location location) |
0c77715b | 19170 | { |
19171 | mpfr_t val; | |
19172 | switch (this->classification_) | |
19173 | { | |
19174 | case NC_INT: | |
19175 | case NC_RUNE: | |
19176 | mpfr_init_set_z(val, this->u_.int_val, GMP_RNDN); | |
19177 | break; | |
19178 | ||
19179 | case NC_FLOAT: | |
19180 | mpfr_init_set(val, this->u_.float_val, GMP_RNDN); | |
19181 | break; | |
19182 | ||
19183 | case NC_COMPLEX: | |
fcbea5e4 | 19184 | if (!mpfr_zero_p(mpc_imagref(this->u_.complex_val))) |
0c77715b | 19185 | { |
19186 | if (issue_error) | |
71a45216 | 19187 | { |
19188 | this->set_invalid(); | |
37423a84 | 19189 | go_error_at(location, |
19190 | "complex constant truncated to floating-point"); | |
71a45216 | 19191 | } |
0c77715b | 19192 | return false; |
19193 | } | |
fcbea5e4 | 19194 | mpfr_init_set(val, mpc_realref(this->u_.complex_val), GMP_RNDN); |
0c77715b | 19195 | break; |
19196 | ||
19197 | default: | |
19198 | go_unreachable(); | |
19199 | } | |
19200 | ||
19201 | bool ret; | |
19202 | if (type->is_abstract()) | |
19203 | ret = true; | |
19204 | else if (mpfr_nan_p(val) || mpfr_inf_p(val) || mpfr_zero_p(val)) | |
19205 | { | |
19206 | // A NaN or Infinity always fits in the range of the type. | |
19207 | ret = true; | |
19208 | } | |
19209 | else | |
19210 | { | |
19211 | mp_exp_t exp = mpfr_get_exp(val); | |
19212 | mp_exp_t max_exp; | |
19213 | switch (type->bits()) | |
19214 | { | |
19215 | case 32: | |
19216 | max_exp = 128; | |
19217 | break; | |
19218 | case 64: | |
19219 | max_exp = 1024; | |
19220 | break; | |
19221 | default: | |
19222 | go_unreachable(); | |
19223 | } | |
19224 | ||
19225 | ret = exp <= max_exp; | |
d0bcce51 | 19226 | |
19227 | if (ret) | |
19228 | { | |
19229 | // Round the constant to the desired type. | |
19230 | mpfr_t t; | |
19231 | mpfr_init(t); | |
19232 | switch (type->bits()) | |
19233 | { | |
19234 | case 32: | |
19235 | mpfr_set_prec(t, 24); | |
19236 | break; | |
19237 | case 64: | |
19238 | mpfr_set_prec(t, 53); | |
19239 | break; | |
19240 | default: | |
19241 | go_unreachable(); | |
19242 | } | |
19243 | mpfr_set(t, val, GMP_RNDN); | |
19244 | mpfr_set(val, t, GMP_RNDN); | |
19245 | mpfr_clear(t); | |
19246 | ||
19247 | this->set_float(type, val); | |
19248 | } | |
0c77715b | 19249 | } |
19250 | ||
19251 | mpfr_clear(val); | |
19252 | ||
19253 | if (!ret && issue_error) | |
71a45216 | 19254 | { |
37423a84 | 19255 | go_error_at(location, "floating-point constant overflow"); |
71a45216 | 19256 | this->set_invalid(); |
19257 | } | |
0c77715b | 19258 | |
19259 | return ret; | |
f03a9fbf | 19260 | } |
0c77715b | 19261 | |
19262 | // Check whether the constant can be expressed in a complex type. | |
19263 | ||
19264 | bool | |
19265 | Numeric_constant::check_complex_type(Complex_type* type, bool issue_error, | |
d0bcce51 | 19266 | Location location) |
0c77715b | 19267 | { |
19268 | if (type->is_abstract()) | |
19269 | return true; | |
19270 | ||
19271 | mp_exp_t max_exp; | |
19272 | switch (type->bits()) | |
19273 | { | |
19274 | case 64: | |
19275 | max_exp = 128; | |
19276 | break; | |
19277 | case 128: | |
19278 | max_exp = 1024; | |
19279 | break; | |
19280 | default: | |
19281 | go_unreachable(); | |
19282 | } | |
19283 | ||
fcbea5e4 | 19284 | mpc_t val; |
19285 | mpc_init2(val, mpc_precision); | |
0c77715b | 19286 | switch (this->classification_) |
19287 | { | |
19288 | case NC_INT: | |
19289 | case NC_RUNE: | |
fcbea5e4 | 19290 | mpc_set_z(val, this->u_.int_val, MPC_RNDNN); |
0c77715b | 19291 | break; |
19292 | ||
19293 | case NC_FLOAT: | |
fcbea5e4 | 19294 | mpc_set_fr(val, this->u_.float_val, MPC_RNDNN); |
0c77715b | 19295 | break; |
19296 | ||
19297 | case NC_COMPLEX: | |
fcbea5e4 | 19298 | mpc_set(val, this->u_.complex_val, MPC_RNDNN); |
0c77715b | 19299 | break; |
19300 | ||
19301 | default: | |
19302 | go_unreachable(); | |
19303 | } | |
19304 | ||
d0bcce51 | 19305 | bool ret = true; |
fcbea5e4 | 19306 | if (!mpfr_nan_p(mpc_realref(val)) |
19307 | && !mpfr_inf_p(mpc_realref(val)) | |
19308 | && !mpfr_zero_p(mpc_realref(val)) | |
19309 | && mpfr_get_exp(mpc_realref(val)) > max_exp) | |
d0bcce51 | 19310 | { |
19311 | if (issue_error) | |
71a45216 | 19312 | { |
631d5788 | 19313 | go_error_at(location, "complex real part overflow"); |
71a45216 | 19314 | this->set_invalid(); |
19315 | } | |
d0bcce51 | 19316 | ret = false; |
19317 | } | |
0c77715b | 19318 | |
fcbea5e4 | 19319 | if (!mpfr_nan_p(mpc_imagref(val)) |
19320 | && !mpfr_inf_p(mpc_imagref(val)) | |
19321 | && !mpfr_zero_p(mpc_imagref(val)) | |
19322 | && mpfr_get_exp(mpc_imagref(val)) > max_exp) | |
d0bcce51 | 19323 | { |
19324 | if (issue_error) | |
71a45216 | 19325 | { |
631d5788 | 19326 | go_error_at(location, "complex imaginary part overflow"); |
71a45216 | 19327 | this->set_invalid(); |
19328 | } | |
d0bcce51 | 19329 | ret = false; |
19330 | } | |
0c77715b | 19331 | |
d0bcce51 | 19332 | if (ret) |
19333 | { | |
19334 | // Round the constant to the desired type. | |
fcbea5e4 | 19335 | mpc_t t; |
d0bcce51 | 19336 | switch (type->bits()) |
19337 | { | |
19338 | case 64: | |
fcbea5e4 | 19339 | mpc_init2(t, 24); |
d0bcce51 | 19340 | break; |
19341 | case 128: | |
fcbea5e4 | 19342 | mpc_init2(t, 53); |
d0bcce51 | 19343 | break; |
19344 | default: | |
19345 | go_unreachable(); | |
19346 | } | |
fcbea5e4 | 19347 | mpc_set(t, val, MPC_RNDNN); |
19348 | mpc_set(val, t, MPC_RNDNN); | |
19349 | mpc_clear(t); | |
d0bcce51 | 19350 | |
fcbea5e4 | 19351 | this->set_complex(type, val); |
d0bcce51 | 19352 | } |
19353 | ||
fcbea5e4 | 19354 | mpc_clear(val); |
0c77715b | 19355 | |
19356 | return ret; | |
19357 | } | |
19358 | ||
19359 | // Return an Expression for this value. | |
19360 | ||
19361 | Expression* | |
19362 | Numeric_constant::expression(Location loc) const | |
19363 | { | |
19364 | switch (this->classification_) | |
19365 | { | |
19366 | case NC_INT: | |
e67508fa | 19367 | return Expression::make_integer_z(&this->u_.int_val, this->type_, loc); |
0c77715b | 19368 | case NC_RUNE: |
19369 | return Expression::make_character(&this->u_.int_val, this->type_, loc); | |
19370 | case NC_FLOAT: | |
19371 | return Expression::make_float(&this->u_.float_val, this->type_, loc); | |
19372 | case NC_COMPLEX: | |
fcbea5e4 | 19373 | return Expression::make_complex(&this->u_.complex_val, this->type_, loc); |
71a45216 | 19374 | case NC_INVALID: |
19375 | go_assert(saw_errors()); | |
19376 | return Expression::make_error(loc); | |
0c77715b | 19377 | default: |
19378 | go_unreachable(); | |
19379 | } | |
19380 | } | |
0ab32342 | 19381 | |
19382 | // Calculate a hash code with a given seed. | |
19383 | ||
19384 | unsigned int | |
19385 | Numeric_constant::hash(unsigned int seed) const | |
19386 | { | |
19387 | unsigned long val; | |
19388 | const unsigned int PRIME = 97; | |
19389 | long e = 0; | |
19390 | double f = 1.0; | |
19391 | mpfr_t m; | |
19392 | ||
19393 | switch (this->classification_) | |
19394 | { | |
19395 | case NC_INVALID: | |
19396 | return PRIME; | |
19397 | case NC_INT: | |
19398 | case NC_RUNE: | |
19399 | val = mpz_get_ui(this->u_.int_val); | |
19400 | break; | |
19401 | case NC_COMPLEX: | |
19402 | mpfr_init(m); | |
0570cb84 | 19403 | mpc_abs(m, this->u_.complex_val, GMP_RNDN); |
19404 | val = mpfr_get_ui(m, GMP_RNDN); | |
0ab32342 | 19405 | mpfr_clear(m); |
19406 | break; | |
19407 | case NC_FLOAT: | |
29d43984 | 19408 | f = mpfr_get_d_2exp(&e, this->u_.float_val, GMP_RNDN) * 4294967295.0; |
0ab32342 | 19409 | val = static_cast<unsigned long>(e + static_cast<long>(f)); |
19410 | break; | |
19411 | default: | |
19412 | go_unreachable(); | |
19413 | } | |
19414 | ||
19415 | return (static_cast<unsigned int>(val) + seed) * PRIME; | |
19416 | } |