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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 | ||
a7549a6a | 90 | // Give an error saying that the value of the expression is not used. |
e440a328 | 91 | |
92 | void | |
a7549a6a | 93 | Expression::unused_value_error() |
e440a328 | 94 | { |
4f2138d7 | 95 | this->report_error(_("value computed is not used")); |
e440a328 | 96 | } |
97 | ||
98 | // Note that this expression is an error. This is called by children | |
99 | // when they discover an error. | |
100 | ||
101 | void | |
102 | Expression::set_is_error() | |
103 | { | |
104 | this->classification_ = EXPRESSION_ERROR; | |
105 | } | |
106 | ||
107 | // For children to call to report an error conveniently. | |
108 | ||
109 | void | |
110 | Expression::report_error(const char* msg) | |
111 | { | |
631d5788 | 112 | go_error_at(this->location_, "%s", msg); |
e440a328 | 113 | this->set_is_error(); |
114 | } | |
115 | ||
116 | // Set types of variables and constants. This is implemented by the | |
117 | // child class. | |
118 | ||
119 | void | |
120 | Expression::determine_type(const Type_context* context) | |
121 | { | |
122 | this->do_determine_type(context); | |
123 | } | |
124 | ||
125 | // Set types when there is no context. | |
126 | ||
127 | void | |
128 | Expression::determine_type_no_context() | |
129 | { | |
130 | Type_context context; | |
131 | this->do_determine_type(&context); | |
132 | } | |
133 | ||
d3c55148 | 134 | // Return true if two expressions refer to the same variable or struct |
135 | // field. This can only be true when there are no side effects. | |
136 | ||
137 | bool | |
138 | Expression::is_same_variable(Expression* a, Expression* b) | |
139 | { | |
140 | if (a->classification() != b->classification()) | |
141 | return false; | |
142 | ||
143 | Var_expression* av = a->var_expression(); | |
144 | if (av != NULL) | |
145 | return av->named_object() == b->var_expression()->named_object(); | |
146 | ||
147 | Field_reference_expression* af = a->field_reference_expression(); | |
148 | if (af != NULL) | |
149 | { | |
150 | Field_reference_expression* bf = b->field_reference_expression(); | |
151 | return (af->field_index() == bf->field_index() | |
152 | && Expression::is_same_variable(af->expr(), bf->expr())); | |
153 | } | |
154 | ||
155 | Unary_expression* au = a->unary_expression(); | |
156 | if (au != NULL) | |
157 | { | |
158 | Unary_expression* bu = b->unary_expression(); | |
159 | return (au->op() == OPERATOR_MULT | |
160 | && bu->op() == OPERATOR_MULT | |
161 | && Expression::is_same_variable(au->operand(), | |
162 | bu->operand())); | |
163 | } | |
164 | ||
165 | return false; | |
166 | } | |
167 | ||
2c809f8f | 168 | // Return an expression handling any conversions which must be done during |
e440a328 | 169 | // assignment. |
170 | ||
2c809f8f | 171 | Expression* |
b4a33049 | 172 | Expression::convert_for_assignment(Gogo*, Type* lhs_type, |
2c809f8f | 173 | Expression* rhs, Location location) |
e440a328 | 174 | { |
2c809f8f | 175 | Type* rhs_type = rhs->type(); |
176 | if (lhs_type->is_error() | |
177 | || rhs_type->is_error() | |
178 | || rhs->is_error_expression()) | |
179 | return Expression::make_error(location); | |
e440a328 | 180 | |
3a522dcc | 181 | bool are_identical = Type::are_identical(lhs_type, rhs_type, |
182 | (Type::COMPARE_ERRORS | |
183 | | Type::COMPARE_TAGS), | |
184 | NULL); | |
22984631 | 185 | if (!are_identical && lhs_type->interface_type() != NULL) |
e440a328 | 186 | { |
187 | if (rhs_type->interface_type() == NULL) | |
2c809f8f | 188 | return Expression::convert_type_to_interface(lhs_type, rhs, location); |
e440a328 | 189 | else |
2c809f8f | 190 | return Expression::convert_interface_to_interface(lhs_type, rhs, false, |
191 | location); | |
e440a328 | 192 | } |
22984631 | 193 | else if (!are_identical && rhs_type->interface_type() != NULL) |
2c809f8f | 194 | return Expression::convert_interface_to_type(lhs_type, rhs, location); |
411eb89e | 195 | else if (lhs_type->is_slice_type() && rhs_type->is_nil_type()) |
e440a328 | 196 | { |
2c809f8f | 197 | // Assigning nil to a slice. |
2c809f8f | 198 | Expression* nil = Expression::make_nil(location); |
e67508fa | 199 | Expression* zero = Expression::make_integer_ul(0, NULL, location); |
2c809f8f | 200 | return Expression::make_slice_value(lhs_type, nil, zero, zero, location); |
e440a328 | 201 | } |
202 | else if (rhs_type->is_nil_type()) | |
2c809f8f | 203 | return Expression::make_nil(location); |
22984631 | 204 | else if (are_identical) |
e440a328 | 205 | { |
22984631 | 206 | if (lhs_type->forwarded() != rhs_type->forwarded()) |
207 | { | |
208 | // Different but identical types require an explicit | |
209 | // conversion. This happens with type aliases. | |
210 | return Expression::make_cast(lhs_type, rhs, location); | |
211 | } | |
212 | ||
e440a328 | 213 | // No conversion is needed. |
2c809f8f | 214 | return rhs; |
215 | } | |
216 | else if (lhs_type->points_to() != NULL) | |
217 | return Expression::make_unsafe_cast(lhs_type, rhs, location); | |
218 | else if (lhs_type->is_numeric_type()) | |
219 | return Expression::make_cast(lhs_type, rhs, location); | |
220 | else if ((lhs_type->struct_type() != NULL | |
221 | && rhs_type->struct_type() != NULL) | |
222 | || (lhs_type->array_type() != NULL | |
223 | && rhs_type->array_type() != NULL)) | |
e440a328 | 224 | { |
225 | // This conversion must be permitted by Go, or we wouldn't have | |
226 | // gotten here. | |
2c809f8f | 227 | return Expression::make_unsafe_cast(lhs_type, rhs, location); |
e440a328 | 228 | } |
229 | else | |
2c809f8f | 230 | return rhs; |
e440a328 | 231 | } |
232 | ||
2c809f8f | 233 | // Return an expression for a conversion from a non-interface type to an |
e440a328 | 234 | // interface type. |
235 | ||
2c809f8f | 236 | Expression* |
237 | Expression::convert_type_to_interface(Type* lhs_type, Expression* rhs, | |
238 | Location location) | |
e440a328 | 239 | { |
e440a328 | 240 | Interface_type* lhs_interface_type = lhs_type->interface_type(); |
241 | bool lhs_is_empty = lhs_interface_type->is_empty(); | |
242 | ||
243 | // Since RHS_TYPE is a static type, we can create the interface | |
244 | // method table at compile time. | |
245 | ||
246 | // When setting an interface to nil, we just set both fields to | |
247 | // NULL. | |
2c809f8f | 248 | Type* rhs_type = rhs->type(); |
e440a328 | 249 | if (rhs_type->is_nil_type()) |
63697958 | 250 | { |
2c809f8f | 251 | Expression* nil = Expression::make_nil(location); |
252 | return Expression::make_interface_value(lhs_type, nil, nil, location); | |
63697958 | 253 | } |
e440a328 | 254 | |
255 | // This should have been checked already. | |
2b8629dd | 256 | if (!lhs_interface_type->implements_interface(rhs_type, NULL)) |
257 | { | |
258 | go_assert(saw_errors()); | |
259 | return Expression::make_error(location); | |
260 | } | |
e440a328 | 261 | |
e440a328 | 262 | // An interface is a tuple. If LHS_TYPE is an empty interface type, |
263 | // then the first field is the type descriptor for RHS_TYPE. | |
264 | // Otherwise it is the interface method table for RHS_TYPE. | |
2c809f8f | 265 | Expression* first_field; |
e440a328 | 266 | if (lhs_is_empty) |
2c809f8f | 267 | first_field = Expression::make_type_descriptor(rhs_type, location); |
e440a328 | 268 | else |
269 | { | |
270 | // Build the interface method table for this interface and this | |
271 | // object type: a list of function pointers for each interface | |
272 | // method. | |
273 | Named_type* rhs_named_type = rhs_type->named_type(); | |
c0cab2ec | 274 | Struct_type* rhs_struct_type = rhs_type->struct_type(); |
e440a328 | 275 | bool is_pointer = false; |
c0cab2ec | 276 | if (rhs_named_type == NULL && rhs_struct_type == NULL) |
e440a328 | 277 | { |
278 | rhs_named_type = rhs_type->deref()->named_type(); | |
c0cab2ec | 279 | rhs_struct_type = rhs_type->deref()->struct_type(); |
e440a328 | 280 | is_pointer = true; |
281 | } | |
c0cab2ec | 282 | if (rhs_named_type != NULL) |
2c809f8f | 283 | first_field = |
284 | rhs_named_type->interface_method_table(lhs_interface_type, | |
285 | is_pointer); | |
c0cab2ec | 286 | else if (rhs_struct_type != NULL) |
2c809f8f | 287 | first_field = |
288 | rhs_struct_type->interface_method_table(lhs_interface_type, | |
289 | is_pointer); | |
c0cab2ec | 290 | else |
2c809f8f | 291 | first_field = Expression::make_nil(location); |
e440a328 | 292 | } |
e440a328 | 293 | |
2c809f8f | 294 | Expression* obj; |
e440a328 | 295 | if (rhs_type->points_to() != NULL) |
296 | { | |
2c809f8f | 297 | // We are assigning a pointer to the interface; the interface |
e440a328 | 298 | // holds the pointer itself. |
2c809f8f | 299 | obj = rhs; |
300 | } | |
301 | else | |
302 | { | |
303 | // We are assigning a non-pointer value to the interface; the | |
45ff893b | 304 | // interface gets a copy of the value in the heap if it escapes. |
305 | // TODO(cmang): Associate escape state state of RHS with newly | |
306 | // created OBJ. | |
2c809f8f | 307 | obj = Expression::make_heap_expression(rhs, location); |
e440a328 | 308 | } |
309 | ||
2c809f8f | 310 | return Expression::make_interface_value(lhs_type, first_field, obj, location); |
311 | } | |
e440a328 | 312 | |
2c809f8f | 313 | // Return an expression for the type descriptor of RHS. |
e440a328 | 314 | |
2c809f8f | 315 | Expression* |
316 | Expression::get_interface_type_descriptor(Expression* rhs) | |
317 | { | |
318 | go_assert(rhs->type()->interface_type() != NULL); | |
319 | Location location = rhs->location(); | |
e440a328 | 320 | |
2c809f8f | 321 | // The type descriptor is the first field of an empty interface. |
322 | if (rhs->type()->interface_type()->is_empty()) | |
323 | return Expression::make_interface_info(rhs, INTERFACE_INFO_TYPE_DESCRIPTOR, | |
324 | location); | |
325 | ||
326 | Expression* mtable = | |
327 | Expression::make_interface_info(rhs, INTERFACE_INFO_METHODS, location); | |
e440a328 | 328 | |
2c809f8f | 329 | Expression* descriptor = |
f614ea8b | 330 | Expression::make_dereference(mtable, NIL_CHECK_NOT_NEEDED, location); |
2c809f8f | 331 | descriptor = Expression::make_field_reference(descriptor, 0, location); |
332 | Expression* nil = Expression::make_nil(location); | |
e440a328 | 333 | |
2c809f8f | 334 | Expression* eq = |
335 | Expression::make_binary(OPERATOR_EQEQ, mtable, nil, location); | |
336 | return Expression::make_conditional(eq, nil, descriptor, location); | |
e440a328 | 337 | } |
338 | ||
2c809f8f | 339 | // Return an expression for the conversion of an interface type to an |
e440a328 | 340 | // interface type. |
341 | ||
2c809f8f | 342 | Expression* |
343 | Expression::convert_interface_to_interface(Type *lhs_type, Expression* rhs, | |
344 | bool for_type_guard, | |
345 | Location location) | |
e440a328 | 346 | { |
3a522dcc | 347 | if (Type::are_identical(lhs_type, rhs->type(), |
348 | Type::COMPARE_ERRORS | Type::COMPARE_TAGS, | |
349 | NULL)) | |
8ba8cc87 | 350 | return rhs; |
351 | ||
e440a328 | 352 | Interface_type* lhs_interface_type = lhs_type->interface_type(); |
353 | bool lhs_is_empty = lhs_interface_type->is_empty(); | |
354 | ||
e440a328 | 355 | // In the general case this requires runtime examination of the type |
356 | // method table to match it up with the interface methods. | |
357 | ||
358 | // FIXME: If all of the methods in the right hand side interface | |
359 | // also appear in the left hand side interface, then we don't need | |
360 | // to do a runtime check, although we still need to build a new | |
361 | // method table. | |
362 | ||
8ba8cc87 | 363 | // We are going to evaluate RHS multiple times. |
364 | go_assert(rhs->is_variable()); | |
365 | ||
e440a328 | 366 | // Get the type descriptor for the right hand side. This will be |
367 | // NULL for a nil interface. | |
2c809f8f | 368 | Expression* rhs_type_expr = Expression::get_interface_type_descriptor(rhs); |
369 | Expression* lhs_type_expr = | |
370 | Expression::make_type_descriptor(lhs_type, location); | |
e440a328 | 371 | |
2c809f8f | 372 | Expression* first_field; |
e440a328 | 373 | if (for_type_guard) |
374 | { | |
375 | // A type assertion fails when converting a nil interface. | |
6098d6cb | 376 | first_field = Runtime::make_call(Runtime::ASSERTITAB, location, 2, |
377 | lhs_type_expr, rhs_type_expr); | |
e440a328 | 378 | } |
379 | else if (lhs_is_empty) | |
380 | { | |
2c809f8f | 381 | // A conversion to an empty interface always succeeds, and the |
e440a328 | 382 | // first field is just the type descriptor of the object. |
2c809f8f | 383 | first_field = rhs_type_expr; |
e440a328 | 384 | } |
385 | else | |
386 | { | |
387 | // A conversion to a non-empty interface may fail, but unlike a | |
388 | // type assertion converting nil will always succeed. | |
6098d6cb | 389 | first_field = Runtime::make_call(Runtime::REQUIREITAB, location, 2, |
390 | lhs_type_expr, rhs_type_expr); | |
e440a328 | 391 | } |
392 | ||
393 | // The second field is simply the object pointer. | |
2c809f8f | 394 | Expression* obj = |
395 | Expression::make_interface_info(rhs, INTERFACE_INFO_OBJECT, location); | |
396 | return Expression::make_interface_value(lhs_type, first_field, obj, location); | |
e440a328 | 397 | } |
398 | ||
2c809f8f | 399 | // Return an expression for the conversion of an interface type to a |
e440a328 | 400 | // non-interface type. |
401 | ||
2c809f8f | 402 | Expression* |
403 | Expression::convert_interface_to_type(Type *lhs_type, Expression* rhs, | |
404 | Location location) | |
e440a328 | 405 | { |
8ba8cc87 | 406 | // We are going to evaluate RHS multiple times. |
407 | go_assert(rhs->is_variable()); | |
408 | ||
e440a328 | 409 | // Call a function to check that the type is valid. The function |
410 | // will panic with an appropriate runtime type error if the type is | |
411 | // not valid. | |
2c809f8f | 412 | Expression* lhs_type_expr = Expression::make_type_descriptor(lhs_type, |
413 | location); | |
414 | Expression* rhs_descriptor = | |
415 | Expression::get_interface_type_descriptor(rhs); | |
416 | ||
417 | Type* rhs_type = rhs->type(); | |
418 | Expression* rhs_inter_expr = Expression::make_type_descriptor(rhs_type, | |
419 | location); | |
420 | ||
6098d6cb | 421 | Expression* check_iface = Runtime::make_call(Runtime::ASSERTI2T, |
2c809f8f | 422 | location, 3, lhs_type_expr, |
423 | rhs_descriptor, rhs_inter_expr); | |
e440a328 | 424 | |
425 | // If the call succeeds, pull out the value. | |
2c809f8f | 426 | Expression* obj = Expression::make_interface_info(rhs, INTERFACE_INFO_OBJECT, |
427 | location); | |
e440a328 | 428 | |
429 | // If the value is a pointer, then it is the value we want. | |
430 | // Otherwise it points to the value. | |
431 | if (lhs_type->points_to() == NULL) | |
432 | { | |
2c809f8f | 433 | obj = Expression::make_unsafe_cast(Type::make_pointer_type(lhs_type), obj, |
434 | location); | |
f614ea8b | 435 | obj = Expression::make_dereference(obj, NIL_CHECK_NOT_NEEDED, |
436 | location); | |
e440a328 | 437 | } |
2c809f8f | 438 | return Expression::make_compound(check_iface, obj, location); |
e440a328 | 439 | } |
440 | ||
ea664253 | 441 | // Convert an expression to its backend representation. This is implemented by |
442 | // the child class. Not that it is not in general safe to call this multiple | |
e440a328 | 443 | // times for a single expression, but that we don't catch such errors. |
444 | ||
ea664253 | 445 | Bexpression* |
446 | Expression::get_backend(Translate_context* context) | |
e440a328 | 447 | { |
448 | // The child may have marked this expression as having an error. | |
449 | if (this->classification_ == EXPRESSION_ERROR) | |
ea664253 | 450 | return context->backend()->error_expression(); |
e440a328 | 451 | |
ea664253 | 452 | return this->do_get_backend(context); |
e440a328 | 453 | } |
454 | ||
48c2a53a | 455 | // Return a backend expression for VAL. |
456 | Bexpression* | |
457 | Expression::backend_numeric_constant_expression(Translate_context* context, | |
458 | Numeric_constant* val) | |
e440a328 | 459 | { |
48c2a53a | 460 | Gogo* gogo = context->gogo(); |
461 | Type* type = val->type(); | |
462 | if (type == NULL) | |
463 | return gogo->backend()->error_expression(); | |
e440a328 | 464 | |
48c2a53a | 465 | Btype* btype = type->get_backend(gogo); |
466 | Bexpression* ret; | |
467 | if (type->integer_type() != NULL) | |
e440a328 | 468 | { |
469 | mpz_t ival; | |
48c2a53a | 470 | if (!val->to_int(&ival)) |
471 | { | |
472 | go_assert(saw_errors()); | |
473 | return gogo->backend()->error_expression(); | |
474 | } | |
475 | ret = gogo->backend()->integer_constant_expression(btype, ival); | |
e440a328 | 476 | mpz_clear(ival); |
e440a328 | 477 | } |
48c2a53a | 478 | else if (type->float_type() != NULL) |
e440a328 | 479 | { |
48c2a53a | 480 | mpfr_t fval; |
481 | if (!val->to_float(&fval)) | |
482 | { | |
483 | go_assert(saw_errors()); | |
484 | return gogo->backend()->error_expression(); | |
485 | } | |
486 | ret = gogo->backend()->float_constant_expression(btype, fval); | |
487 | mpfr_clear(fval); | |
e440a328 | 488 | } |
48c2a53a | 489 | else if (type->complex_type() != NULL) |
e440a328 | 490 | { |
fcbea5e4 | 491 | mpc_t cval; |
492 | if (!val->to_complex(&cval)) | |
48c2a53a | 493 | { |
494 | go_assert(saw_errors()); | |
495 | return gogo->backend()->error_expression(); | |
496 | } | |
fcbea5e4 | 497 | ret = gogo->backend()->complex_constant_expression(btype, cval); |
498 | mpc_clear(cval); | |
e440a328 | 499 | } |
500 | else | |
c3e6f413 | 501 | go_unreachable(); |
e440a328 | 502 | |
48c2a53a | 503 | return ret; |
e440a328 | 504 | } |
505 | ||
2c809f8f | 506 | // Return an expression which evaluates to true if VAL, of arbitrary integer |
507 | // type, is negative or is more than the maximum value of the Go type "int". | |
e440a328 | 508 | |
2c809f8f | 509 | Expression* |
510 | Expression::check_bounds(Expression* val, Location loc) | |
e440a328 | 511 | { |
2c809f8f | 512 | Type* val_type = val->type(); |
513 | Type* bound_type = Type::lookup_integer_type("int"); | |
514 | ||
515 | int val_type_size; | |
516 | bool val_is_unsigned = false; | |
517 | if (val_type->integer_type() != NULL) | |
518 | { | |
519 | val_type_size = val_type->integer_type()->bits(); | |
520 | val_is_unsigned = val_type->integer_type()->is_unsigned(); | |
521 | } | |
522 | else | |
523 | { | |
524 | if (!val_type->is_numeric_type() | |
525 | || !Type::are_convertible(bound_type, val_type, NULL)) | |
526 | { | |
527 | go_assert(saw_errors()); | |
528 | return Expression::make_boolean(true, loc); | |
529 | } | |
e440a328 | 530 | |
2c809f8f | 531 | if (val_type->complex_type() != NULL) |
532 | val_type_size = val_type->complex_type()->bits(); | |
533 | else | |
534 | val_type_size = val_type->float_type()->bits(); | |
535 | } | |
536 | ||
537 | Expression* negative_index = Expression::make_boolean(false, loc); | |
538 | Expression* index_overflows = Expression::make_boolean(false, loc); | |
539 | if (!val_is_unsigned) | |
e440a328 | 540 | { |
e67508fa | 541 | Expression* zero = Expression::make_integer_ul(0, val_type, loc); |
2c809f8f | 542 | negative_index = Expression::make_binary(OPERATOR_LT, val, zero, loc); |
e440a328 | 543 | } |
544 | ||
2c809f8f | 545 | int bound_type_size = bound_type->integer_type()->bits(); |
c3068ac0 | 546 | if (val_type_size > bound_type_size |
547 | || (val_type_size == bound_type_size | |
2c809f8f | 548 | && val_is_unsigned)) |
549 | { | |
550 | mpz_t one; | |
551 | mpz_init_set_ui(one, 1UL); | |
552 | ||
553 | // maxval = 2^(bound_type_size - 1) - 1 | |
554 | mpz_t maxval; | |
555 | mpz_init(maxval); | |
556 | mpz_mul_2exp(maxval, one, bound_type_size - 1); | |
557 | mpz_sub_ui(maxval, maxval, 1); | |
e67508fa | 558 | Expression* max = Expression::make_integer_z(&maxval, val_type, loc); |
2c809f8f | 559 | mpz_clear(one); |
560 | mpz_clear(maxval); | |
561 | ||
562 | index_overflows = Expression::make_binary(OPERATOR_GT, val, max, loc); | |
e440a328 | 563 | } |
564 | ||
2c809f8f | 565 | return Expression::make_binary(OPERATOR_OROR, negative_index, index_overflows, |
566 | loc); | |
e440a328 | 567 | } |
568 | ||
d751bb78 | 569 | void |
570 | Expression::dump_expression(Ast_dump_context* ast_dump_context) const | |
571 | { | |
572 | this->do_dump_expression(ast_dump_context); | |
573 | } | |
574 | ||
e440a328 | 575 | // Error expressions. This are used to avoid cascading errors. |
576 | ||
577 | class Error_expression : public Expression | |
578 | { | |
579 | public: | |
b13c66cd | 580 | Error_expression(Location location) |
e440a328 | 581 | : Expression(EXPRESSION_ERROR, location) |
582 | { } | |
583 | ||
584 | protected: | |
585 | bool | |
586 | do_is_constant() const | |
587 | { return true; } | |
588 | ||
589 | bool | |
0c77715b | 590 | do_numeric_constant_value(Numeric_constant* nc) const |
e440a328 | 591 | { |
0c77715b | 592 | nc->set_unsigned_long(NULL, 0); |
e440a328 | 593 | return true; |
594 | } | |
595 | ||
4f2138d7 | 596 | bool |
e440a328 | 597 | do_discarding_value() |
4f2138d7 | 598 | { return true; } |
e440a328 | 599 | |
600 | Type* | |
601 | do_type() | |
602 | { return Type::make_error_type(); } | |
603 | ||
604 | void | |
605 | do_determine_type(const Type_context*) | |
606 | { } | |
607 | ||
608 | Expression* | |
609 | do_copy() | |
610 | { return this; } | |
611 | ||
612 | bool | |
613 | do_is_addressable() const | |
614 | { return true; } | |
615 | ||
ea664253 | 616 | Bexpression* |
617 | do_get_backend(Translate_context* context) | |
618 | { return context->backend()->error_expression(); } | |
d751bb78 | 619 | |
620 | void | |
621 | do_dump_expression(Ast_dump_context*) const; | |
e440a328 | 622 | }; |
623 | ||
d751bb78 | 624 | // Dump the ast representation for an error expression to a dump context. |
625 | ||
626 | void | |
627 | Error_expression::do_dump_expression(Ast_dump_context* ast_dump_context) const | |
628 | { | |
629 | ast_dump_context->ostream() << "_Error_" ; | |
630 | } | |
631 | ||
e440a328 | 632 | Expression* |
b13c66cd | 633 | Expression::make_error(Location location) |
e440a328 | 634 | { |
635 | return new Error_expression(location); | |
636 | } | |
637 | ||
638 | // An expression which is really a type. This is used during parsing. | |
639 | // It is an error if these survive after lowering. | |
640 | ||
641 | class | |
642 | Type_expression : public Expression | |
643 | { | |
644 | public: | |
b13c66cd | 645 | Type_expression(Type* type, Location location) |
e440a328 | 646 | : Expression(EXPRESSION_TYPE, location), |
647 | type_(type) | |
648 | { } | |
649 | ||
650 | protected: | |
651 | int | |
652 | do_traverse(Traverse* traverse) | |
653 | { return Type::traverse(this->type_, traverse); } | |
654 | ||
655 | Type* | |
656 | do_type() | |
657 | { return this->type_; } | |
658 | ||
659 | void | |
660 | do_determine_type(const Type_context*) | |
661 | { } | |
662 | ||
663 | void | |
664 | do_check_types(Gogo*) | |
665 | { this->report_error(_("invalid use of type")); } | |
666 | ||
667 | Expression* | |
668 | do_copy() | |
669 | { return this; } | |
670 | ||
ea664253 | 671 | Bexpression* |
672 | do_get_backend(Translate_context*) | |
c3e6f413 | 673 | { go_unreachable(); } |
e440a328 | 674 | |
d751bb78 | 675 | void do_dump_expression(Ast_dump_context*) const; |
f03a9fbf | 676 | |
e440a328 | 677 | private: |
678 | // The type which we are representing as an expression. | |
679 | Type* type_; | |
680 | }; | |
681 | ||
d751bb78 | 682 | void |
683 | Type_expression::do_dump_expression(Ast_dump_context* ast_dump_context) const | |
684 | { | |
685 | ast_dump_context->dump_type(this->type_); | |
686 | } | |
687 | ||
e440a328 | 688 | Expression* |
b13c66cd | 689 | Expression::make_type(Type* type, Location location) |
e440a328 | 690 | { |
691 | return new Type_expression(type, location); | |
692 | } | |
693 | ||
e03bdf36 | 694 | // Class Parser_expression. |
695 | ||
696 | Type* | |
697 | Parser_expression::do_type() | |
698 | { | |
699 | // We should never really ask for the type of a Parser_expression. | |
700 | // However, it can happen, at least when we have an invalid const | |
701 | // whose initializer refers to the const itself. In that case we | |
702 | // may ask for the type when lowering the const itself. | |
c484d925 | 703 | go_assert(saw_errors()); |
e03bdf36 | 704 | return Type::make_error_type(); |
705 | } | |
706 | ||
e440a328 | 707 | // Class Var_expression. |
708 | ||
709 | // Lower a variable expression. Here we just make sure that the | |
710 | // initialization expression of the variable has been lowered. This | |
711 | // ensures that we will be able to determine the type of the variable | |
712 | // if necessary. | |
713 | ||
714 | Expression* | |
ceeb4318 | 715 | Var_expression::do_lower(Gogo* gogo, Named_object* function, |
716 | Statement_inserter* inserter, int) | |
e440a328 | 717 | { |
718 | if (this->variable_->is_variable()) | |
719 | { | |
720 | Variable* var = this->variable_->var_value(); | |
721 | // This is either a local variable or a global variable. A | |
722 | // reference to a variable which is local to an enclosing | |
723 | // function will be a reference to a field in a closure. | |
724 | if (var->is_global()) | |
ceeb4318 | 725 | { |
726 | function = NULL; | |
727 | inserter = NULL; | |
728 | } | |
729 | var->lower_init_expression(gogo, function, inserter); | |
e440a328 | 730 | } |
731 | return this; | |
732 | } | |
733 | ||
e440a328 | 734 | // Return the type of a reference to a variable. |
735 | ||
736 | Type* | |
737 | Var_expression::do_type() | |
738 | { | |
739 | if (this->variable_->is_variable()) | |
740 | return this->variable_->var_value()->type(); | |
741 | else if (this->variable_->is_result_variable()) | |
742 | return this->variable_->result_var_value()->type(); | |
743 | else | |
c3e6f413 | 744 | go_unreachable(); |
e440a328 | 745 | } |
746 | ||
0ab09e06 | 747 | // Determine the type of a reference to a variable. |
748 | ||
749 | void | |
750 | Var_expression::do_determine_type(const Type_context*) | |
751 | { | |
752 | if (this->variable_->is_variable()) | |
753 | this->variable_->var_value()->determine_type(); | |
754 | } | |
755 | ||
e440a328 | 756 | // Something takes the address of this variable. This means that we |
757 | // may want to move the variable onto the heap. | |
758 | ||
759 | void | |
760 | Var_expression::do_address_taken(bool escapes) | |
761 | { | |
762 | if (!escapes) | |
f325319b | 763 | { |
764 | if (this->variable_->is_variable()) | |
765 | this->variable_->var_value()->set_non_escaping_address_taken(); | |
766 | else if (this->variable_->is_result_variable()) | |
767 | this->variable_->result_var_value()->set_non_escaping_address_taken(); | |
768 | else | |
769 | go_unreachable(); | |
770 | } | |
e440a328 | 771 | else |
f325319b | 772 | { |
773 | if (this->variable_->is_variable()) | |
774 | this->variable_->var_value()->set_address_taken(); | |
775 | else if (this->variable_->is_result_variable()) | |
776 | this->variable_->result_var_value()->set_address_taken(); | |
777 | else | |
778 | go_unreachable(); | |
779 | } | |
45ff893b | 780 | |
781 | if (this->variable_->is_variable() | |
782 | && this->variable_->var_value()->is_in_heap()) | |
783 | { | |
784 | Node::make_node(this)->set_encoding(Node::ESCAPE_HEAP); | |
785 | Node::make_node(this->variable_)->set_encoding(Node::ESCAPE_HEAP); | |
786 | } | |
e440a328 | 787 | } |
788 | ||
5f6f5357 | 789 | // The cost to inline a variable reference. We currently only support |
790 | // references to parameters. | |
791 | ||
792 | int | |
793 | Var_expression::do_inlining_cost() const | |
794 | { | |
795 | if (this->variable_->is_variable()) | |
796 | { | |
797 | if (this->variable_->var_value()->is_parameter()) | |
798 | return 1; | |
799 | } | |
800 | else if (this->variable_->is_result_variable()) | |
801 | return 1; | |
802 | ||
803 | return 0x100000; | |
804 | } | |
805 | ||
806 | // Export a reference to a variable. | |
807 | ||
808 | void | |
809 | Var_expression::do_export(Export_function_body* efb) const | |
810 | { | |
811 | efb->write_string(Gogo::unpack_hidden_name(this->variable_->name())); | |
812 | } | |
813 | ||
ea664253 | 814 | // Get the backend representation for a reference to a variable. |
e440a328 | 815 | |
ea664253 | 816 | Bexpression* |
817 | Var_expression::do_get_backend(Translate_context* context) | |
e440a328 | 818 | { |
fe2f84cf | 819 | Bvariable* bvar = this->variable_->get_backend_variable(context->gogo(), |
820 | context->function()); | |
fe2f84cf | 821 | bool is_in_heap; |
c6777780 | 822 | Location loc = this->location(); |
9b27b43c | 823 | Btype* btype; |
824 | Gogo* gogo = context->gogo(); | |
fe2f84cf | 825 | if (this->variable_->is_variable()) |
9b27b43c | 826 | { |
827 | is_in_heap = this->variable_->var_value()->is_in_heap(); | |
828 | btype = this->variable_->var_value()->type()->get_backend(gogo); | |
829 | } | |
fe2f84cf | 830 | else if (this->variable_->is_result_variable()) |
9b27b43c | 831 | { |
832 | is_in_heap = this->variable_->result_var_value()->is_in_heap(); | |
833 | btype = this->variable_->result_var_value()->type()->get_backend(gogo); | |
834 | } | |
fe2f84cf | 835 | else |
c3e6f413 | 836 | go_unreachable(); |
c6777780 | 837 | |
d4e6573e | 838 | Bexpression* ret = |
7af8e400 | 839 | context->backend()->var_expression(bvar, loc); |
fe2f84cf | 840 | if (is_in_heap) |
9b27b43c | 841 | ret = context->backend()->indirect_expression(btype, ret, true, loc); |
ea664253 | 842 | return ret; |
e440a328 | 843 | } |
844 | ||
d751bb78 | 845 | // Ast dump for variable expression. |
846 | ||
847 | void | |
848 | Var_expression::do_dump_expression(Ast_dump_context* ast_dump_context) const | |
849 | { | |
cd5e24c1 | 850 | ast_dump_context->ostream() << this->variable_->message_name() ; |
d751bb78 | 851 | } |
852 | ||
e440a328 | 853 | // Make a reference to a variable in an expression. |
854 | ||
855 | Expression* | |
b13c66cd | 856 | Expression::make_var_reference(Named_object* var, Location location) |
e440a328 | 857 | { |
858 | if (var->is_sink()) | |
859 | return Expression::make_sink(location); | |
860 | ||
861 | // FIXME: Creating a new object for each reference to a variable is | |
862 | // wasteful. | |
863 | return new Var_expression(var, location); | |
864 | } | |
865 | ||
b0c09712 | 866 | // Class Enclosed_var_expression. |
867 | ||
868 | int | |
869 | Enclosed_var_expression::do_traverse(Traverse*) | |
870 | { | |
871 | return TRAVERSE_CONTINUE; | |
872 | } | |
873 | ||
874 | // Lower the reference to the enclosed variable. | |
875 | ||
876 | Expression* | |
877 | Enclosed_var_expression::do_lower(Gogo* gogo, Named_object* function, | |
878 | Statement_inserter* inserter, int) | |
879 | { | |
880 | gogo->lower_expression(function, inserter, &this->reference_); | |
881 | return this; | |
882 | } | |
883 | ||
884 | // Flatten the reference to the enclosed variable. | |
885 | ||
886 | Expression* | |
887 | Enclosed_var_expression::do_flatten(Gogo* gogo, Named_object* function, | |
888 | Statement_inserter* inserter) | |
889 | { | |
890 | gogo->flatten_expression(function, inserter, &this->reference_); | |
891 | return this; | |
892 | } | |
893 | ||
894 | void | |
895 | Enclosed_var_expression::do_address_taken(bool escapes) | |
896 | { | |
897 | if (!escapes) | |
898 | { | |
899 | if (this->variable_->is_variable()) | |
900 | this->variable_->var_value()->set_non_escaping_address_taken(); | |
901 | else if (this->variable_->is_result_variable()) | |
902 | this->variable_->result_var_value()->set_non_escaping_address_taken(); | |
903 | else | |
904 | go_unreachable(); | |
905 | } | |
906 | else | |
907 | { | |
908 | if (this->variable_->is_variable()) | |
909 | this->variable_->var_value()->set_address_taken(); | |
910 | else if (this->variable_->is_result_variable()) | |
911 | this->variable_->result_var_value()->set_address_taken(); | |
912 | else | |
913 | go_unreachable(); | |
914 | } | |
45ff893b | 915 | |
916 | if (this->variable_->is_variable() | |
917 | && this->variable_->var_value()->is_in_heap()) | |
918 | Node::make_node(this->variable_)->set_encoding(Node::ESCAPE_HEAP); | |
b0c09712 | 919 | } |
920 | ||
921 | // Ast dump for enclosed variable expression. | |
922 | ||
923 | void | |
924 | Enclosed_var_expression::do_dump_expression(Ast_dump_context* adc) const | |
925 | { | |
cd5e24c1 | 926 | adc->ostream() << this->variable_->message_name(); |
b0c09712 | 927 | } |
928 | ||
929 | // Make a reference to a variable within an enclosing function. | |
930 | ||
931 | Expression* | |
932 | Expression::make_enclosing_var_reference(Expression* reference, | |
933 | Named_object* var, Location location) | |
934 | { | |
935 | return new Enclosed_var_expression(reference, var, location); | |
936 | } | |
937 | ||
e440a328 | 938 | // Class Temporary_reference_expression. |
939 | ||
940 | // The type. | |
941 | ||
942 | Type* | |
943 | Temporary_reference_expression::do_type() | |
944 | { | |
945 | return this->statement_->type(); | |
946 | } | |
947 | ||
948 | // Called if something takes the address of this temporary variable. | |
949 | // We never have to move temporary variables to the heap, but we do | |
950 | // need to know that they must live in the stack rather than in a | |
951 | // register. | |
952 | ||
953 | void | |
954 | Temporary_reference_expression::do_address_taken(bool) | |
955 | { | |
956 | this->statement_->set_is_address_taken(); | |
957 | } | |
958 | ||
ea664253 | 959 | // Get a backend expression referring to the variable. |
e440a328 | 960 | |
ea664253 | 961 | Bexpression* |
962 | Temporary_reference_expression::do_get_backend(Translate_context* context) | |
e440a328 | 963 | { |
cd440cff | 964 | Gogo* gogo = context->gogo(); |
eefc1ed3 | 965 | Bvariable* bvar = this->statement_->get_backend_variable(context); |
7af8e400 | 966 | Bexpression* ret = gogo->backend()->var_expression(bvar, this->location()); |
eefc1ed3 | 967 | |
cd440cff | 968 | // The backend can't always represent the same set of recursive types |
eefc1ed3 | 969 | // that the Go frontend can. In some cases this means that a |
970 | // temporary variable won't have the right backend type. Correct | |
971 | // that here by adding a type cast. We need to use base() to push | |
972 | // the circularity down one level. | |
cd440cff | 973 | Type* stype = this->statement_->type(); |
ceeb4318 | 974 | if (!this->is_lvalue_ |
03118c21 | 975 | && stype->points_to() != NULL |
976 | && stype->points_to()->is_void_type()) | |
eefc1ed3 | 977 | { |
cd440cff | 978 | Btype* btype = this->type()->base()->get_backend(gogo); |
979 | ret = gogo->backend()->convert_expression(btype, ret, this->location()); | |
eefc1ed3 | 980 | } |
ea664253 | 981 | return ret; |
e440a328 | 982 | } |
983 | ||
d751bb78 | 984 | // Ast dump for temporary reference. |
985 | ||
986 | void | |
987 | Temporary_reference_expression::do_dump_expression( | |
988 | Ast_dump_context* ast_dump_context) const | |
989 | { | |
990 | ast_dump_context->dump_temp_variable_name(this->statement_); | |
991 | } | |
992 | ||
e440a328 | 993 | // Make a reference to a temporary variable. |
994 | ||
ceeb4318 | 995 | Temporary_reference_expression* |
e440a328 | 996 | Expression::make_temporary_reference(Temporary_statement* statement, |
b13c66cd | 997 | Location location) |
e440a328 | 998 | { |
999 | return new Temporary_reference_expression(statement, location); | |
1000 | } | |
1001 | ||
e9d3367e | 1002 | // Class Set_and_use_temporary_expression. |
1003 | ||
1004 | // Return the type. | |
1005 | ||
1006 | Type* | |
1007 | Set_and_use_temporary_expression::do_type() | |
1008 | { | |
1009 | return this->statement_->type(); | |
1010 | } | |
1011 | ||
0afbb937 | 1012 | // Determine the type of the expression. |
1013 | ||
1014 | void | |
1015 | Set_and_use_temporary_expression::do_determine_type( | |
1016 | const Type_context* context) | |
1017 | { | |
1018 | this->expr_->determine_type(context); | |
1019 | } | |
1020 | ||
e9d3367e | 1021 | // Take the address. |
1022 | ||
1023 | void | |
1024 | Set_and_use_temporary_expression::do_address_taken(bool) | |
1025 | { | |
1026 | this->statement_->set_is_address_taken(); | |
1027 | } | |
1028 | ||
1029 | // Return the backend representation. | |
1030 | ||
ea664253 | 1031 | Bexpression* |
1032 | Set_and_use_temporary_expression::do_get_backend(Translate_context* context) | |
e9d3367e | 1033 | { |
e9d3367e | 1034 | Location loc = this->location(); |
a302c105 | 1035 | Gogo* gogo = context->gogo(); |
1036 | Bvariable* bvar = this->statement_->get_backend_variable(context); | |
7af8e400 | 1037 | Bexpression* lvar_ref = gogo->backend()->var_expression(bvar, loc); |
a302c105 | 1038 | |
0ab48656 | 1039 | Named_object* fn = context->function(); |
1040 | go_assert(fn != NULL); | |
1041 | Bfunction* bfn = fn->func_value()->get_or_make_decl(gogo, fn); | |
ea664253 | 1042 | Bexpression* bexpr = this->expr_->get_backend(context); |
0ab48656 | 1043 | Bstatement* set = gogo->backend()->assignment_statement(bfn, lvar_ref, |
1044 | bexpr, loc); | |
7af8e400 | 1045 | Bexpression* var_ref = gogo->backend()->var_expression(bvar, loc); |
a302c105 | 1046 | Bexpression* ret = gogo->backend()->compound_expression(set, var_ref, loc); |
ea664253 | 1047 | return ret; |
e9d3367e | 1048 | } |
1049 | ||
1050 | // Dump. | |
1051 | ||
1052 | void | |
1053 | Set_and_use_temporary_expression::do_dump_expression( | |
1054 | Ast_dump_context* ast_dump_context) const | |
1055 | { | |
1056 | ast_dump_context->ostream() << '('; | |
1057 | ast_dump_context->dump_temp_variable_name(this->statement_); | |
1058 | ast_dump_context->ostream() << " = "; | |
1059 | this->expr_->dump_expression(ast_dump_context); | |
1060 | ast_dump_context->ostream() << ')'; | |
1061 | } | |
1062 | ||
1063 | // Make a set-and-use temporary. | |
1064 | ||
1065 | Set_and_use_temporary_expression* | |
1066 | Expression::make_set_and_use_temporary(Temporary_statement* statement, | |
1067 | Expression* expr, Location location) | |
1068 | { | |
1069 | return new Set_and_use_temporary_expression(statement, expr, location); | |
1070 | } | |
1071 | ||
e440a328 | 1072 | // A sink expression--a use of the blank identifier _. |
1073 | ||
1074 | class Sink_expression : public Expression | |
1075 | { | |
1076 | public: | |
b13c66cd | 1077 | Sink_expression(Location location) |
e440a328 | 1078 | : Expression(EXPRESSION_SINK, location), |
aa93217a | 1079 | type_(NULL), bvar_(NULL) |
e440a328 | 1080 | { } |
1081 | ||
1082 | protected: | |
4f2138d7 | 1083 | bool |
e440a328 | 1084 | do_discarding_value() |
4f2138d7 | 1085 | { return true; } |
e440a328 | 1086 | |
1087 | Type* | |
1088 | do_type(); | |
1089 | ||
1090 | void | |
1091 | do_determine_type(const Type_context*); | |
1092 | ||
1093 | Expression* | |
1094 | do_copy() | |
1095 | { return new Sink_expression(this->location()); } | |
1096 | ||
ea664253 | 1097 | Bexpression* |
1098 | do_get_backend(Translate_context*); | |
e440a328 | 1099 | |
d751bb78 | 1100 | void |
1101 | do_dump_expression(Ast_dump_context*) const; | |
1102 | ||
e440a328 | 1103 | private: |
1104 | // The type of this sink variable. | |
1105 | Type* type_; | |
1106 | // The temporary variable we generate. | |
aa93217a | 1107 | Bvariable* bvar_; |
e440a328 | 1108 | }; |
1109 | ||
1110 | // Return the type of a sink expression. | |
1111 | ||
1112 | Type* | |
1113 | Sink_expression::do_type() | |
1114 | { | |
1115 | if (this->type_ == NULL) | |
1116 | return Type::make_sink_type(); | |
1117 | return this->type_; | |
1118 | } | |
1119 | ||
1120 | // Determine the type of a sink expression. | |
1121 | ||
1122 | void | |
1123 | Sink_expression::do_determine_type(const Type_context* context) | |
1124 | { | |
1125 | if (context->type != NULL) | |
1126 | this->type_ = context->type; | |
1127 | } | |
1128 | ||
1129 | // Return a temporary variable for a sink expression. This will | |
1130 | // presumably be a write-only variable which the middle-end will drop. | |
1131 | ||
ea664253 | 1132 | Bexpression* |
1133 | Sink_expression::do_get_backend(Translate_context* context) | |
e440a328 | 1134 | { |
aa93217a | 1135 | Location loc = this->location(); |
1136 | Gogo* gogo = context->gogo(); | |
1137 | if (this->bvar_ == NULL) | |
e440a328 | 1138 | { |
c484d925 | 1139 | go_assert(this->type_ != NULL && !this->type_->is_sink_type()); |
aa93217a | 1140 | Named_object* fn = context->function(); |
1141 | go_assert(fn != NULL); | |
1142 | Bfunction* fn_ctx = fn->func_value()->get_or_make_decl(gogo, fn); | |
9f0e0513 | 1143 | Btype* bt = this->type_->get_backend(context->gogo()); |
aa93217a | 1144 | Bstatement* decl; |
1145 | this->bvar_ = | |
1146 | gogo->backend()->temporary_variable(fn_ctx, context->bblock(), bt, NULL, | |
1147 | false, loc, &decl); | |
d4e6573e | 1148 | Bexpression* var_ref = |
7af8e400 | 1149 | gogo->backend()->var_expression(this->bvar_, loc); |
aa93217a | 1150 | var_ref = gogo->backend()->compound_expression(decl, var_ref, loc); |
ea664253 | 1151 | return var_ref; |
e440a328 | 1152 | } |
7af8e400 | 1153 | return gogo->backend()->var_expression(this->bvar_, loc); |
e440a328 | 1154 | } |
1155 | ||
d751bb78 | 1156 | // Ast dump for sink expression. |
1157 | ||
1158 | void | |
1159 | Sink_expression::do_dump_expression(Ast_dump_context* ast_dump_context) const | |
1160 | { | |
1161 | ast_dump_context->ostream() << "_" ; | |
1162 | } | |
1163 | ||
e440a328 | 1164 | // Make a sink expression. |
1165 | ||
1166 | Expression* | |
b13c66cd | 1167 | Expression::make_sink(Location location) |
e440a328 | 1168 | { |
1169 | return new Sink_expression(location); | |
1170 | } | |
1171 | ||
1172 | // Class Func_expression. | |
1173 | ||
1174 | // FIXME: Can a function expression appear in a constant expression? | |
1175 | // The value is unchanging. Initializing a constant to the address of | |
1176 | // a function seems like it could work, though there might be little | |
1177 | // point to it. | |
1178 | ||
e440a328 | 1179 | // Traversal. |
1180 | ||
1181 | int | |
1182 | Func_expression::do_traverse(Traverse* traverse) | |
1183 | { | |
1184 | return (this->closure_ == NULL | |
1185 | ? TRAVERSE_CONTINUE | |
1186 | : Expression::traverse(&this->closure_, traverse)); | |
1187 | } | |
1188 | ||
1189 | // Return the type of a function expression. | |
1190 | ||
1191 | Type* | |
1192 | Func_expression::do_type() | |
1193 | { | |
1194 | if (this->function_->is_function()) | |
1195 | return this->function_->func_value()->type(); | |
1196 | else if (this->function_->is_function_declaration()) | |
1197 | return this->function_->func_declaration_value()->type(); | |
1198 | else | |
c3e6f413 | 1199 | go_unreachable(); |
e440a328 | 1200 | } |
1201 | ||
ea664253 | 1202 | // Get the backend representation for the code of a function expression. |
e440a328 | 1203 | |
97267c39 | 1204 | Bexpression* |
8381eda7 | 1205 | Func_expression::get_code_pointer(Gogo* gogo, Named_object* no, Location loc) |
e440a328 | 1206 | { |
1207 | Function_type* fntype; | |
8381eda7 | 1208 | if (no->is_function()) |
1209 | fntype = no->func_value()->type(); | |
1210 | else if (no->is_function_declaration()) | |
1211 | fntype = no->func_declaration_value()->type(); | |
e440a328 | 1212 | else |
c3e6f413 | 1213 | go_unreachable(); |
e440a328 | 1214 | |
1215 | // Builtin functions are handled specially by Call_expression. We | |
1216 | // can't take their address. | |
1217 | if (fntype->is_builtin()) | |
1218 | { | |
631d5788 | 1219 | go_error_at(loc, |
1220 | "invalid use of special builtin function %qs; must be called", | |
1221 | no->message_name().c_str()); | |
97267c39 | 1222 | return gogo->backend()->error_expression(); |
e440a328 | 1223 | } |
1224 | ||
97267c39 | 1225 | Bfunction* fndecl; |
e440a328 | 1226 | if (no->is_function()) |
cf3cae55 | 1227 | fndecl = no->func_value()->get_or_make_decl(gogo, no); |
e440a328 | 1228 | else if (no->is_function_declaration()) |
cf3cae55 | 1229 | fndecl = no->func_declaration_value()->get_or_make_decl(gogo, no); |
e440a328 | 1230 | else |
c3e6f413 | 1231 | go_unreachable(); |
e440a328 | 1232 | |
97267c39 | 1233 | return gogo->backend()->function_code_expression(fndecl, loc); |
e440a328 | 1234 | } |
1235 | ||
ea664253 | 1236 | // Get the backend representation for a function expression. This is used when |
1237 | // we take the address of a function rather than simply calling it. A func | |
8381eda7 | 1238 | // value is represented as a pointer to a block of memory. The first |
1239 | // word of that memory is a pointer to the function code. The | |
1240 | // remaining parts of that memory are the addresses of variables that | |
1241 | // the function closes over. | |
e440a328 | 1242 | |
ea664253 | 1243 | Bexpression* |
1244 | Func_expression::do_get_backend(Translate_context* context) | |
e440a328 | 1245 | { |
8381eda7 | 1246 | // If there is no closure, just use the function descriptor. |
2010c17a | 1247 | if (this->closure_ == NULL) |
8381eda7 | 1248 | { |
1249 | Gogo* gogo = context->gogo(); | |
1250 | Named_object* no = this->function_; | |
1251 | Expression* descriptor; | |
1252 | if (no->is_function()) | |
1253 | descriptor = no->func_value()->descriptor(gogo, no); | |
1254 | else if (no->is_function_declaration()) | |
1255 | { | |
1256 | if (no->func_declaration_value()->type()->is_builtin()) | |
1257 | { | |
631d5788 | 1258 | go_error_at(this->location(), |
1259 | ("invalid use of special builtin function %qs; " | |
1260 | "must be called"), | |
1261 | no->message_name().c_str()); | |
ea664253 | 1262 | return gogo->backend()->error_expression(); |
8381eda7 | 1263 | } |
1264 | descriptor = no->func_declaration_value()->descriptor(gogo, no); | |
1265 | } | |
1266 | else | |
1267 | go_unreachable(); | |
2010c17a | 1268 | |
ea664253 | 1269 | Bexpression* bdesc = descriptor->get_backend(context); |
1270 | return gogo->backend()->address_expression(bdesc, this->location()); | |
8381eda7 | 1271 | } |
e440a328 | 1272 | |
8381eda7 | 1273 | go_assert(this->function_->func_value()->enclosing() != NULL); |
e440a328 | 1274 | |
8381eda7 | 1275 | // If there is a closure, then the closure is itself the function |
1276 | // expression. It is a pointer to a struct whose first field points | |
1277 | // to the function code and whose remaining fields are the addresses | |
1278 | // of the closed-over variables. | |
76818e19 | 1279 | Bexpression *bexpr = this->closure_->get_backend(context); |
1280 | ||
1281 | // Introduce a backend type conversion, to account for any differences | |
1282 | // between the argument type (function descriptor, struct with a | |
1283 | // single field) and the closure (struct with multiple fields). | |
1284 | Gogo* gogo = context->gogo(); | |
1285 | Btype *btype = this->type()->get_backend(gogo); | |
1286 | return gogo->backend()->convert_expression(btype, bexpr, this->location()); | |
e440a328 | 1287 | } |
1288 | ||
d751bb78 | 1289 | // Ast dump for function. |
1290 | ||
1291 | void | |
1292 | Func_expression::do_dump_expression(Ast_dump_context* ast_dump_context) const | |
1293 | { | |
8b1c301d | 1294 | ast_dump_context->ostream() << this->function_->name(); |
1295 | if (this->closure_ != NULL) | |
1296 | { | |
1297 | ast_dump_context->ostream() << " {closure = "; | |
1298 | this->closure_->dump_expression(ast_dump_context); | |
1299 | ast_dump_context->ostream() << "}"; | |
1300 | } | |
d751bb78 | 1301 | } |
1302 | ||
e440a328 | 1303 | // Make a reference to a function in an expression. |
1304 | ||
1305 | Expression* | |
1306 | Expression::make_func_reference(Named_object* function, Expression* closure, | |
b13c66cd | 1307 | Location location) |
e440a328 | 1308 | { |
b1d7ecfa | 1309 | Func_expression* fe = new Func_expression(function, closure, location); |
1310 | ||
1311 | // Detect references to builtin functions and set the runtime code if | |
1312 | // appropriate. | |
1313 | if (function->is_function_declaration()) | |
1314 | fe->set_runtime_code(Runtime::name_to_code(function->name())); | |
1315 | return fe; | |
e440a328 | 1316 | } |
1317 | ||
c6837989 | 1318 | // Class Func_descriptor_expression. |
8381eda7 | 1319 | |
c6837989 | 1320 | // Constructor. |
8381eda7 | 1321 | |
c6837989 | 1322 | Func_descriptor_expression::Func_descriptor_expression(Named_object* fn) |
1323 | : Expression(EXPRESSION_FUNC_DESCRIPTOR, fn->location()), | |
f8bdf81a | 1324 | fn_(fn), dvar_(NULL) |
c6837989 | 1325 | { |
1326 | go_assert(!fn->is_function() || !fn->func_value()->needs_closure()); | |
1327 | } | |
8381eda7 | 1328 | |
c6837989 | 1329 | // Traversal. |
8381eda7 | 1330 | |
c6837989 | 1331 | int |
1332 | Func_descriptor_expression::do_traverse(Traverse*) | |
1333 | { | |
1334 | return TRAVERSE_CONTINUE; | |
1335 | } | |
8381eda7 | 1336 | |
1337 | // All function descriptors have the same type. | |
1338 | ||
1339 | Type* Func_descriptor_expression::descriptor_type; | |
1340 | ||
1341 | void | |
1342 | Func_descriptor_expression::make_func_descriptor_type() | |
1343 | { | |
1344 | if (Func_descriptor_expression::descriptor_type != NULL) | |
1345 | return; | |
1346 | Type* uintptr_type = Type::lookup_integer_type("uintptr"); | |
81487fff | 1347 | Type* struct_type = Type::make_builtin_struct_type(1, "fn", uintptr_type); |
8381eda7 | 1348 | Func_descriptor_expression::descriptor_type = |
1349 | Type::make_builtin_named_type("functionDescriptor", struct_type); | |
1350 | } | |
1351 | ||
1352 | Type* | |
1353 | Func_descriptor_expression::do_type() | |
1354 | { | |
1355 | Func_descriptor_expression::make_func_descriptor_type(); | |
1356 | return Func_descriptor_expression::descriptor_type; | |
1357 | } | |
1358 | ||
ea664253 | 1359 | // The backend representation for a function descriptor. |
8381eda7 | 1360 | |
ea664253 | 1361 | Bexpression* |
1362 | Func_descriptor_expression::do_get_backend(Translate_context* context) | |
8381eda7 | 1363 | { |
8381eda7 | 1364 | Named_object* no = this->fn_; |
1365 | Location loc = no->location(); | |
ea664253 | 1366 | if (this->dvar_ != NULL) |
7af8e400 | 1367 | return context->backend()->var_expression(this->dvar_, loc); |
8381eda7 | 1368 | |
ea664253 | 1369 | Gogo* gogo = context->gogo(); |
19272321 | 1370 | std::string var_name(gogo->function_descriptor_name(no)); |
09e57698 | 1371 | bool is_descriptor = false; |
1372 | if (no->is_function_declaration() | |
1373 | && !no->func_declaration_value()->asm_name().empty() | |
1374 | && Linemap::is_predeclared_location(no->location())) | |
19272321 | 1375 | is_descriptor = true; |
8381eda7 | 1376 | |
13f2fdb8 | 1377 | // The runtime package implements some functions defined in the |
1378 | // syscall package. Let the syscall package define the descriptor | |
1379 | // in this case. | |
1380 | if (gogo->compiling_runtime() | |
1381 | && gogo->package_name() == "runtime" | |
1382 | && no->is_function() | |
1383 | && !no->func_value()->asm_name().empty() | |
1384 | && no->func_value()->asm_name().compare(0, 8, "syscall.") == 0) | |
1385 | is_descriptor = true; | |
1386 | ||
8381eda7 | 1387 | Btype* btype = this->type()->get_backend(gogo); |
1388 | ||
1389 | Bvariable* bvar; | |
438b4bec | 1390 | std::string asm_name(go_selectively_encode_id(var_name)); |
09e57698 | 1391 | if (no->package() != NULL || is_descriptor) |
438b4bec | 1392 | bvar = context->backend()->immutable_struct_reference(var_name, asm_name, |
1393 | btype, loc); | |
8381eda7 | 1394 | else |
1395 | { | |
1396 | Location bloc = Linemap::predeclared_location(); | |
80efb81d | 1397 | |
1398 | // The runtime package has hash/equality functions that are | |
1399 | // referenced by type descriptors outside of the runtime, so the | |
1400 | // function descriptors must be visible even though they are not | |
1401 | // exported. | |
1402 | bool is_exported_runtime = false; | |
1403 | if (gogo->compiling_runtime() | |
1404 | && gogo->package_name() == "runtime" | |
1405 | && (no->name().find("hash") != std::string::npos | |
1406 | || no->name().find("equal") != std::string::npos)) | |
1407 | is_exported_runtime = true; | |
1408 | ||
8381eda7 | 1409 | bool is_hidden = ((no->is_function() |
1410 | && no->func_value()->enclosing() != NULL) | |
80efb81d | 1411 | || (Gogo::is_hidden_name(no->name()) |
1412 | && !is_exported_runtime) | |
8381eda7 | 1413 | || Gogo::is_thunk(no)); |
80efb81d | 1414 | |
438b4bec | 1415 | bvar = context->backend()->immutable_struct(var_name, asm_name, |
1416 | is_hidden, false, | |
8381eda7 | 1417 | btype, bloc); |
1418 | Expression_list* vals = new Expression_list(); | |
f8bdf81a | 1419 | vals->push_back(Expression::make_func_code_reference(this->fn_, bloc)); |
8381eda7 | 1420 | Expression* init = |
1421 | Expression::make_struct_composite_literal(this->type(), vals, bloc); | |
1422 | Translate_context bcontext(gogo, NULL, NULL, NULL); | |
1423 | bcontext.set_is_const(); | |
ea664253 | 1424 | Bexpression* binit = init->get_backend(&bcontext); |
8381eda7 | 1425 | context->backend()->immutable_struct_set_init(bvar, var_name, is_hidden, |
1426 | false, btype, bloc, binit); | |
1427 | } | |
1428 | ||
1429 | this->dvar_ = bvar; | |
7af8e400 | 1430 | return gogo->backend()->var_expression(bvar, loc); |
8381eda7 | 1431 | } |
1432 | ||
c6837989 | 1433 | // Print a function descriptor expression. |
1434 | ||
1435 | void | |
1436 | Func_descriptor_expression::do_dump_expression(Ast_dump_context* context) const | |
1437 | { | |
1438 | context->ostream() << "[descriptor " << this->fn_->name() << "]"; | |
1439 | } | |
1440 | ||
8381eda7 | 1441 | // Make a function descriptor expression. |
1442 | ||
c6837989 | 1443 | Func_descriptor_expression* |
1444 | Expression::make_func_descriptor(Named_object* fn) | |
8381eda7 | 1445 | { |
c6837989 | 1446 | return new Func_descriptor_expression(fn); |
8381eda7 | 1447 | } |
1448 | ||
1449 | // Make the function descriptor type, so that it can be converted. | |
1450 | ||
1451 | void | |
1452 | Expression::make_func_descriptor_type() | |
1453 | { | |
1454 | Func_descriptor_expression::make_func_descriptor_type(); | |
1455 | } | |
1456 | ||
1457 | // A reference to just the code of a function. | |
1458 | ||
1459 | class Func_code_reference_expression : public Expression | |
1460 | { | |
1461 | public: | |
1462 | Func_code_reference_expression(Named_object* function, Location location) | |
1463 | : Expression(EXPRESSION_FUNC_CODE_REFERENCE, location), | |
1464 | function_(function) | |
1465 | { } | |
1466 | ||
1467 | protected: | |
1468 | int | |
1469 | do_traverse(Traverse*) | |
1470 | { return TRAVERSE_CONTINUE; } | |
1471 | ||
f9ca30f9 | 1472 | bool |
3ae06f68 | 1473 | do_is_static_initializer() const |
f9ca30f9 | 1474 | { return true; } |
1475 | ||
8381eda7 | 1476 | Type* |
1477 | do_type() | |
1478 | { return Type::make_pointer_type(Type::make_void_type()); } | |
1479 | ||
1480 | void | |
1481 | do_determine_type(const Type_context*) | |
1482 | { } | |
1483 | ||
1484 | Expression* | |
1485 | do_copy() | |
1486 | { | |
1487 | return Expression::make_func_code_reference(this->function_, | |
1488 | this->location()); | |
1489 | } | |
1490 | ||
ea664253 | 1491 | Bexpression* |
1492 | do_get_backend(Translate_context*); | |
8381eda7 | 1493 | |
1494 | void | |
1495 | do_dump_expression(Ast_dump_context* context) const | |
1496 | { context->ostream() << "[raw " << this->function_->name() << "]" ; } | |
1497 | ||
1498 | private: | |
1499 | // The function. | |
1500 | Named_object* function_; | |
1501 | }; | |
1502 | ||
ea664253 | 1503 | // Get the backend representation for a reference to function code. |
8381eda7 | 1504 | |
ea664253 | 1505 | Bexpression* |
1506 | Func_code_reference_expression::do_get_backend(Translate_context* context) | |
8381eda7 | 1507 | { |
ea664253 | 1508 | return Func_expression::get_code_pointer(context->gogo(), this->function_, |
1509 | this->location()); | |
8381eda7 | 1510 | } |
1511 | ||
1512 | // Make a reference to the code of a function. | |
1513 | ||
1514 | Expression* | |
1515 | Expression::make_func_code_reference(Named_object* function, Location location) | |
1516 | { | |
1517 | return new Func_code_reference_expression(function, location); | |
1518 | } | |
1519 | ||
e440a328 | 1520 | // Class Unknown_expression. |
1521 | ||
1522 | // Return the name of an unknown expression. | |
1523 | ||
1524 | const std::string& | |
1525 | Unknown_expression::name() const | |
1526 | { | |
1527 | return this->named_object_->name(); | |
1528 | } | |
1529 | ||
1530 | // Lower a reference to an unknown name. | |
1531 | ||
1532 | Expression* | |
ceeb4318 | 1533 | Unknown_expression::do_lower(Gogo*, Named_object*, Statement_inserter*, int) |
e440a328 | 1534 | { |
b13c66cd | 1535 | Location location = this->location(); |
e440a328 | 1536 | Named_object* no = this->named_object_; |
deded542 | 1537 | Named_object* real; |
1538 | if (!no->is_unknown()) | |
1539 | real = no; | |
1540 | else | |
e440a328 | 1541 | { |
deded542 | 1542 | real = no->unknown_value()->real_named_object(); |
1543 | if (real == NULL) | |
1544 | { | |
1545 | if (this->is_composite_literal_key_) | |
1546 | return this; | |
acf8e158 | 1547 | if (!this->no_error_message_) |
631d5788 | 1548 | go_error_at(location, "reference to undefined name %qs", |
1549 | this->named_object_->message_name().c_str()); | |
deded542 | 1550 | return Expression::make_error(location); |
1551 | } | |
e440a328 | 1552 | } |
1553 | switch (real->classification()) | |
1554 | { | |
1555 | case Named_object::NAMED_OBJECT_CONST: | |
1556 | return Expression::make_const_reference(real, location); | |
1557 | case Named_object::NAMED_OBJECT_TYPE: | |
1558 | return Expression::make_type(real->type_value(), location); | |
1559 | case Named_object::NAMED_OBJECT_TYPE_DECLARATION: | |
1560 | if (this->is_composite_literal_key_) | |
1561 | return this; | |
acf8e158 | 1562 | if (!this->no_error_message_) |
631d5788 | 1563 | go_error_at(location, "reference to undefined type %qs", |
1564 | real->message_name().c_str()); | |
e440a328 | 1565 | return Expression::make_error(location); |
1566 | case Named_object::NAMED_OBJECT_VAR: | |
7d834090 | 1567 | real->var_value()->set_is_used(); |
e440a328 | 1568 | return Expression::make_var_reference(real, location); |
1569 | case Named_object::NAMED_OBJECT_FUNC: | |
1570 | case Named_object::NAMED_OBJECT_FUNC_DECLARATION: | |
1571 | return Expression::make_func_reference(real, NULL, location); | |
1572 | case Named_object::NAMED_OBJECT_PACKAGE: | |
1573 | if (this->is_composite_literal_key_) | |
1574 | return this; | |
acf8e158 | 1575 | if (!this->no_error_message_) |
631d5788 | 1576 | go_error_at(location, "unexpected reference to package"); |
e440a328 | 1577 | return Expression::make_error(location); |
1578 | default: | |
c3e6f413 | 1579 | go_unreachable(); |
e440a328 | 1580 | } |
1581 | } | |
1582 | ||
d751bb78 | 1583 | // Dump the ast representation for an unknown expression to a dump context. |
1584 | ||
1585 | void | |
1586 | Unknown_expression::do_dump_expression(Ast_dump_context* ast_dump_context) const | |
1587 | { | |
1588 | ast_dump_context->ostream() << "_Unknown_(" << this->named_object_->name() | |
1589 | << ")"; | |
d751bb78 | 1590 | } |
1591 | ||
e440a328 | 1592 | // Make a reference to an unknown name. |
1593 | ||
acf8e158 | 1594 | Unknown_expression* |
b13c66cd | 1595 | Expression::make_unknown_reference(Named_object* no, Location location) |
e440a328 | 1596 | { |
e440a328 | 1597 | return new Unknown_expression(no, location); |
1598 | } | |
1599 | ||
1600 | // A boolean expression. | |
1601 | ||
1602 | class Boolean_expression : public Expression | |
1603 | { | |
1604 | public: | |
b13c66cd | 1605 | Boolean_expression(bool val, Location location) |
e440a328 | 1606 | : Expression(EXPRESSION_BOOLEAN, location), |
1607 | val_(val), type_(NULL) | |
1608 | { } | |
1609 | ||
1610 | static Expression* | |
bc8e2ef4 | 1611 | do_import(Import_expression*, Location); |
e440a328 | 1612 | |
1613 | protected: | |
1614 | bool | |
1615 | do_is_constant() const | |
1616 | { return true; } | |
1617 | ||
0e168074 | 1618 | bool |
3ae06f68 | 1619 | do_is_static_initializer() const |
0e168074 | 1620 | { return true; } |
1621 | ||
e440a328 | 1622 | Type* |
1623 | do_type(); | |
1624 | ||
1625 | void | |
1626 | do_determine_type(const Type_context*); | |
1627 | ||
1628 | Expression* | |
1629 | do_copy() | |
1630 | { return this; } | |
1631 | ||
ea664253 | 1632 | Bexpression* |
1633 | do_get_backend(Translate_context* context) | |
1634 | { return context->backend()->boolean_constant_expression(this->val_); } | |
e440a328 | 1635 | |
5f6f5357 | 1636 | int |
1637 | do_inlining_cost() const | |
1638 | { return 1; } | |
1639 | ||
e440a328 | 1640 | void |
548be246 | 1641 | do_export(Export_function_body* efb) const |
204d4af4 | 1642 | { efb->write_c_string(this->val_ ? "$true" : "$false"); } |
e440a328 | 1643 | |
d751bb78 | 1644 | void |
1645 | do_dump_expression(Ast_dump_context* ast_dump_context) const | |
1646 | { ast_dump_context->ostream() << (this->val_ ? "true" : "false"); } | |
1647 | ||
e440a328 | 1648 | private: |
1649 | // The constant. | |
1650 | bool val_; | |
1651 | // The type as determined by context. | |
1652 | Type* type_; | |
1653 | }; | |
1654 | ||
1655 | // Get the type. | |
1656 | ||
1657 | Type* | |
1658 | Boolean_expression::do_type() | |
1659 | { | |
1660 | if (this->type_ == NULL) | |
1661 | this->type_ = Type::make_boolean_type(); | |
1662 | return this->type_; | |
1663 | } | |
1664 | ||
1665 | // Set the type from the context. | |
1666 | ||
1667 | void | |
1668 | Boolean_expression::do_determine_type(const Type_context* context) | |
1669 | { | |
1670 | if (this->type_ != NULL && !this->type_->is_abstract()) | |
1671 | ; | |
1672 | else if (context->type != NULL && context->type->is_boolean_type()) | |
1673 | this->type_ = context->type; | |
1674 | else if (!context->may_be_abstract) | |
1675 | this->type_ = Type::lookup_bool_type(); | |
1676 | } | |
1677 | ||
1678 | // Import a boolean constant. | |
1679 | ||
1680 | Expression* | |
bc8e2ef4 | 1681 | Boolean_expression::do_import(Import_expression* imp, Location loc) |
e440a328 | 1682 | { |
204d4af4 | 1683 | if (imp->version() >= EXPORT_FORMAT_V3) |
1684 | imp->require_c_string("$"); | |
e440a328 | 1685 | if (imp->peek_char() == 't') |
1686 | { | |
1687 | imp->require_c_string("true"); | |
9b92780c | 1688 | return Expression::make_boolean(true, loc); |
e440a328 | 1689 | } |
1690 | else | |
1691 | { | |
1692 | imp->require_c_string("false"); | |
9b92780c | 1693 | return Expression::make_boolean(false, loc); |
e440a328 | 1694 | } |
1695 | } | |
1696 | ||
1697 | // Make a boolean expression. | |
1698 | ||
1699 | Expression* | |
b13c66cd | 1700 | Expression::make_boolean(bool val, Location location) |
e440a328 | 1701 | { |
1702 | return new Boolean_expression(val, location); | |
1703 | } | |
1704 | ||
1705 | // Class String_expression. | |
1706 | ||
1707 | // Get the type. | |
1708 | ||
1709 | Type* | |
1710 | String_expression::do_type() | |
1711 | { | |
1712 | if (this->type_ == NULL) | |
1713 | this->type_ = Type::make_string_type(); | |
1714 | return this->type_; | |
1715 | } | |
1716 | ||
1717 | // Set the type from the context. | |
1718 | ||
1719 | void | |
1720 | String_expression::do_determine_type(const Type_context* context) | |
1721 | { | |
1722 | if (this->type_ != NULL && !this->type_->is_abstract()) | |
1723 | ; | |
1724 | else if (context->type != NULL && context->type->is_string_type()) | |
1725 | this->type_ = context->type; | |
1726 | else if (!context->may_be_abstract) | |
1727 | this->type_ = Type::lookup_string_type(); | |
1728 | } | |
1729 | ||
1730 | // Build a string constant. | |
1731 | ||
ea664253 | 1732 | Bexpression* |
1733 | String_expression::do_get_backend(Translate_context* context) | |
e440a328 | 1734 | { |
2c809f8f | 1735 | Gogo* gogo = context->gogo(); |
1736 | Btype* btype = Type::make_string_type()->get_backend(gogo); | |
1737 | ||
1738 | Location loc = this->location(); | |
1739 | std::vector<Bexpression*> init(2); | |
1740 | Bexpression* str_cst = | |
1741 | gogo->backend()->string_constant_expression(this->val_); | |
1742 | init[0] = gogo->backend()->address_expression(str_cst, loc); | |
1743 | ||
1744 | Btype* int_btype = Type::lookup_integer_type("int")->get_backend(gogo); | |
1745 | mpz_t lenval; | |
1746 | mpz_init_set_ui(lenval, this->val_.length()); | |
1747 | init[1] = gogo->backend()->integer_constant_expression(int_btype, lenval); | |
1748 | mpz_clear(lenval); | |
1749 | ||
ea664253 | 1750 | return gogo->backend()->constructor_expression(btype, init, loc); |
e440a328 | 1751 | } |
1752 | ||
8b1c301d | 1753 | // Write string literal to string dump. |
e440a328 | 1754 | |
1755 | void | |
8b1c301d | 1756 | String_expression::export_string(String_dump* exp, |
1757 | const String_expression* str) | |
e440a328 | 1758 | { |
1759 | std::string s; | |
8b1c301d | 1760 | s.reserve(str->val_.length() * 4 + 2); |
e440a328 | 1761 | s += '"'; |
8b1c301d | 1762 | for (std::string::const_iterator p = str->val_.begin(); |
1763 | p != str->val_.end(); | |
e440a328 | 1764 | ++p) |
1765 | { | |
1766 | if (*p == '\\' || *p == '"') | |
1767 | { | |
1768 | s += '\\'; | |
1769 | s += *p; | |
1770 | } | |
1771 | else if (*p >= 0x20 && *p < 0x7f) | |
1772 | s += *p; | |
1773 | else if (*p == '\n') | |
1774 | s += "\\n"; | |
1775 | else if (*p == '\t') | |
1776 | s += "\\t"; | |
1777 | else | |
1778 | { | |
1779 | s += "\\x"; | |
1780 | unsigned char c = *p; | |
1781 | unsigned int dig = c >> 4; | |
1782 | s += dig < 10 ? '0' + dig : 'A' + dig - 10; | |
1783 | dig = c & 0xf; | |
1784 | s += dig < 10 ? '0' + dig : 'A' + dig - 10; | |
1785 | } | |
1786 | } | |
1787 | s += '"'; | |
1788 | exp->write_string(s); | |
1789 | } | |
1790 | ||
8b1c301d | 1791 | // Export a string expression. |
1792 | ||
1793 | void | |
548be246 | 1794 | String_expression::do_export(Export_function_body* efb) const |
8b1c301d | 1795 | { |
548be246 | 1796 | String_expression::export_string(efb, this); |
8b1c301d | 1797 | } |
1798 | ||
e440a328 | 1799 | // Import a string expression. |
1800 | ||
1801 | Expression* | |
bc8e2ef4 | 1802 | String_expression::do_import(Import_expression* imp, Location loc) |
e440a328 | 1803 | { |
1804 | imp->require_c_string("\""); | |
1805 | std::string val; | |
1806 | while (true) | |
1807 | { | |
1808 | int c = imp->get_char(); | |
1809 | if (c == '"' || c == -1) | |
1810 | break; | |
1811 | if (c != '\\') | |
1812 | val += static_cast<char>(c); | |
1813 | else | |
1814 | { | |
1815 | c = imp->get_char(); | |
1816 | if (c == '\\' || c == '"') | |
1817 | val += static_cast<char>(c); | |
1818 | else if (c == 'n') | |
1819 | val += '\n'; | |
1820 | else if (c == 't') | |
1821 | val += '\t'; | |
1822 | else if (c == 'x') | |
1823 | { | |
1824 | c = imp->get_char(); | |
1825 | unsigned int vh = c >= '0' && c <= '9' ? c - '0' : c - 'A' + 10; | |
1826 | c = imp->get_char(); | |
1827 | unsigned int vl = c >= '0' && c <= '9' ? c - '0' : c - 'A' + 10; | |
1828 | char v = (vh << 4) | vl; | |
1829 | val += v; | |
1830 | } | |
1831 | else | |
1832 | { | |
631d5788 | 1833 | go_error_at(imp->location(), "bad string constant"); |
9b92780c | 1834 | return Expression::make_error(loc); |
e440a328 | 1835 | } |
1836 | } | |
1837 | } | |
9b92780c | 1838 | return Expression::make_string(val, loc); |
e440a328 | 1839 | } |
1840 | ||
d751bb78 | 1841 | // Ast dump for string expression. |
1842 | ||
1843 | void | |
1844 | String_expression::do_dump_expression(Ast_dump_context* ast_dump_context) const | |
1845 | { | |
8b1c301d | 1846 | String_expression::export_string(ast_dump_context, this); |
d751bb78 | 1847 | } |
1848 | ||
e440a328 | 1849 | // Make a string expression. |
1850 | ||
1851 | Expression* | |
b13c66cd | 1852 | Expression::make_string(const std::string& val, Location location) |
e440a328 | 1853 | { |
1854 | return new String_expression(val, location); | |
1855 | } | |
1856 | ||
2c809f8f | 1857 | // An expression that evaluates to some characteristic of a string. |
1858 | // This is used when indexing, bound-checking, or nil checking a string. | |
1859 | ||
1860 | class String_info_expression : public Expression | |
1861 | { | |
1862 | public: | |
1863 | String_info_expression(Expression* string, String_info string_info, | |
1864 | Location location) | |
1865 | : Expression(EXPRESSION_STRING_INFO, location), | |
1866 | string_(string), string_info_(string_info) | |
1867 | { } | |
1868 | ||
1869 | protected: | |
1870 | Type* | |
1871 | do_type(); | |
1872 | ||
1873 | void | |
1874 | do_determine_type(const Type_context*) | |
1875 | { go_unreachable(); } | |
1876 | ||
1877 | Expression* | |
1878 | do_copy() | |
1879 | { | |
1880 | return new String_info_expression(this->string_->copy(), this->string_info_, | |
1881 | this->location()); | |
1882 | } | |
1883 | ||
ea664253 | 1884 | Bexpression* |
1885 | do_get_backend(Translate_context* context); | |
2c809f8f | 1886 | |
1887 | void | |
1888 | do_dump_expression(Ast_dump_context*) const; | |
1889 | ||
1890 | void | |
1891 | do_issue_nil_check() | |
1892 | { this->string_->issue_nil_check(); } | |
1893 | ||
1894 | private: | |
1895 | // The string for which we are getting information. | |
1896 | Expression* string_; | |
1897 | // What information we want. | |
1898 | String_info string_info_; | |
1899 | }; | |
1900 | ||
1901 | // Return the type of the string info. | |
1902 | ||
1903 | Type* | |
1904 | String_info_expression::do_type() | |
1905 | { | |
1906 | switch (this->string_info_) | |
1907 | { | |
1908 | case STRING_INFO_DATA: | |
1909 | { | |
1910 | Type* byte_type = Type::lookup_integer_type("uint8"); | |
1911 | return Type::make_pointer_type(byte_type); | |
1912 | } | |
1913 | case STRING_INFO_LENGTH: | |
1914 | return Type::lookup_integer_type("int"); | |
1915 | default: | |
1916 | go_unreachable(); | |
1917 | } | |
1918 | } | |
1919 | ||
1920 | // Return string information in GENERIC. | |
1921 | ||
ea664253 | 1922 | Bexpression* |
1923 | String_info_expression::do_get_backend(Translate_context* context) | |
2c809f8f | 1924 | { |
1925 | Gogo* gogo = context->gogo(); | |
1926 | ||
ea664253 | 1927 | Bexpression* bstring = this->string_->get_backend(context); |
2c809f8f | 1928 | switch (this->string_info_) |
1929 | { | |
1930 | case STRING_INFO_DATA: | |
1931 | case STRING_INFO_LENGTH: | |
ea664253 | 1932 | return gogo->backend()->struct_field_expression(bstring, |
1933 | this->string_info_, | |
1934 | this->location()); | |
2c809f8f | 1935 | break; |
1936 | default: | |
1937 | go_unreachable(); | |
1938 | } | |
2c809f8f | 1939 | } |
1940 | ||
1941 | // Dump ast representation for a type info expression. | |
1942 | ||
1943 | void | |
1944 | String_info_expression::do_dump_expression( | |
1945 | Ast_dump_context* ast_dump_context) const | |
1946 | { | |
1947 | ast_dump_context->ostream() << "stringinfo("; | |
1948 | this->string_->dump_expression(ast_dump_context); | |
1949 | ast_dump_context->ostream() << ","; | |
1950 | ast_dump_context->ostream() << | |
1951 | (this->string_info_ == STRING_INFO_DATA ? "data" | |
1952 | : this->string_info_ == STRING_INFO_LENGTH ? "length" | |
1953 | : "unknown"); | |
1954 | ast_dump_context->ostream() << ")"; | |
1955 | } | |
1956 | ||
1957 | // Make a string info expression. | |
1958 | ||
1959 | Expression* | |
1960 | Expression::make_string_info(Expression* string, String_info string_info, | |
1961 | Location location) | |
1962 | { | |
1963 | return new String_info_expression(string, string_info, location); | |
1964 | } | |
1965 | ||
e440a328 | 1966 | // Make an integer expression. |
1967 | ||
1968 | class Integer_expression : public Expression | |
1969 | { | |
1970 | public: | |
5d4b8566 | 1971 | Integer_expression(const mpz_t* val, Type* type, bool is_character_constant, |
1972 | Location location) | |
e440a328 | 1973 | : Expression(EXPRESSION_INTEGER, location), |
5d4b8566 | 1974 | type_(type), is_character_constant_(is_character_constant) |
e440a328 | 1975 | { mpz_init_set(this->val_, *val); } |
1976 | ||
1977 | static Expression* | |
bc8e2ef4 | 1978 | do_import(Import_expression*, Location); |
e440a328 | 1979 | |
8b1c301d | 1980 | // Write VAL to string dump. |
e440a328 | 1981 | static void |
8b1c301d | 1982 | export_integer(String_dump* exp, const mpz_t val); |
e440a328 | 1983 | |
d751bb78 | 1984 | // Write VAL to dump context. |
1985 | static void | |
1986 | dump_integer(Ast_dump_context* ast_dump_context, const mpz_t val); | |
1987 | ||
e440a328 | 1988 | protected: |
1989 | bool | |
1990 | do_is_constant() const | |
1991 | { return true; } | |
1992 | ||
0e168074 | 1993 | bool |
3ae06f68 | 1994 | do_is_static_initializer() const |
0e168074 | 1995 | { return true; } |
1996 | ||
e440a328 | 1997 | bool |
0c77715b | 1998 | do_numeric_constant_value(Numeric_constant* nc) const; |
e440a328 | 1999 | |
2000 | Type* | |
2001 | do_type(); | |
2002 | ||
2003 | void | |
2004 | do_determine_type(const Type_context* context); | |
2005 | ||
2006 | void | |
2007 | do_check_types(Gogo*); | |
2008 | ||
ea664253 | 2009 | Bexpression* |
2010 | do_get_backend(Translate_context*); | |
e440a328 | 2011 | |
2012 | Expression* | |
2013 | do_copy() | |
5d4b8566 | 2014 | { |
2015 | if (this->is_character_constant_) | |
de590a61 | 2016 | return Expression::make_character(&this->val_, |
2017 | (this->type_ == NULL | |
2018 | ? NULL | |
2019 | : this->type_->copy_expressions()), | |
5d4b8566 | 2020 | this->location()); |
2021 | else | |
de590a61 | 2022 | return Expression::make_integer_z(&this->val_, |
2023 | (this->type_ == NULL | |
2024 | ? NULL | |
2025 | : this->type_->copy_expressions()), | |
e67508fa | 2026 | this->location()); |
5d4b8566 | 2027 | } |
e440a328 | 2028 | |
5f6f5357 | 2029 | int |
2030 | do_inlining_cost() const | |
2031 | { return 1; } | |
2032 | ||
e440a328 | 2033 | void |
548be246 | 2034 | do_export(Export_function_body*) const; |
e440a328 | 2035 | |
d751bb78 | 2036 | void |
2037 | do_dump_expression(Ast_dump_context*) const; | |
2038 | ||
e440a328 | 2039 | private: |
2040 | // The integer value. | |
2041 | mpz_t val_; | |
2042 | // The type so far. | |
2043 | Type* type_; | |
5d4b8566 | 2044 | // Whether this is a character constant. |
2045 | bool is_character_constant_; | |
e440a328 | 2046 | }; |
2047 | ||
0c77715b | 2048 | // Return a numeric constant for this expression. We have to mark |
2049 | // this as a character when appropriate. | |
e440a328 | 2050 | |
2051 | bool | |
0c77715b | 2052 | Integer_expression::do_numeric_constant_value(Numeric_constant* nc) const |
e440a328 | 2053 | { |
0c77715b | 2054 | if (this->is_character_constant_) |
2055 | nc->set_rune(this->type_, this->val_); | |
2056 | else | |
2057 | nc->set_int(this->type_, this->val_); | |
e440a328 | 2058 | return true; |
2059 | } | |
2060 | ||
2061 | // Return the current type. If we haven't set the type yet, we return | |
2062 | // an abstract integer type. | |
2063 | ||
2064 | Type* | |
2065 | Integer_expression::do_type() | |
2066 | { | |
2067 | if (this->type_ == NULL) | |
5d4b8566 | 2068 | { |
2069 | if (this->is_character_constant_) | |
2070 | this->type_ = Type::make_abstract_character_type(); | |
2071 | else | |
2072 | this->type_ = Type::make_abstract_integer_type(); | |
2073 | } | |
e440a328 | 2074 | return this->type_; |
2075 | } | |
2076 | ||
2077 | // Set the type of the integer value. Here we may switch from an | |
2078 | // abstract type to a real type. | |
2079 | ||
2080 | void | |
2081 | Integer_expression::do_determine_type(const Type_context* context) | |
2082 | { | |
2083 | if (this->type_ != NULL && !this->type_->is_abstract()) | |
2084 | ; | |
0c77715b | 2085 | else if (context->type != NULL && context->type->is_numeric_type()) |
e440a328 | 2086 | this->type_ = context->type; |
2087 | else if (!context->may_be_abstract) | |
5d4b8566 | 2088 | { |
2089 | if (this->is_character_constant_) | |
2090 | this->type_ = Type::lookup_integer_type("int32"); | |
2091 | else | |
2092 | this->type_ = Type::lookup_integer_type("int"); | |
2093 | } | |
e440a328 | 2094 | } |
2095 | ||
e440a328 | 2096 | // Check the type of an integer constant. |
2097 | ||
2098 | void | |
2099 | Integer_expression::do_check_types(Gogo*) | |
2100 | { | |
0c77715b | 2101 | Type* type = this->type_; |
2102 | if (type == NULL) | |
e440a328 | 2103 | return; |
0c77715b | 2104 | Numeric_constant nc; |
2105 | if (this->is_character_constant_) | |
2106 | nc.set_rune(NULL, this->val_); | |
2107 | else | |
2108 | nc.set_int(NULL, this->val_); | |
2109 | if (!nc.set_type(type, true, this->location())) | |
e440a328 | 2110 | this->set_is_error(); |
2111 | } | |
2112 | ||
ea664253 | 2113 | // Get the backend representation for an integer constant. |
e440a328 | 2114 | |
ea664253 | 2115 | Bexpression* |
2116 | Integer_expression::do_get_backend(Translate_context* context) | |
e440a328 | 2117 | { |
12373dd5 | 2118 | if (this->is_error_expression() |
2119 | || (this->type_ != NULL && this->type_->is_error_type())) | |
2120 | { | |
2121 | go_assert(saw_errors()); | |
2122 | return context->gogo()->backend()->error_expression(); | |
2123 | } | |
2124 | ||
48c2a53a | 2125 | Type* resolved_type = NULL; |
e440a328 | 2126 | if (this->type_ != NULL && !this->type_->is_abstract()) |
48c2a53a | 2127 | resolved_type = this->type_; |
e440a328 | 2128 | else if (this->type_ != NULL && this->type_->float_type() != NULL) |
2129 | { | |
2130 | // We are converting to an abstract floating point type. | |
48c2a53a | 2131 | resolved_type = Type::lookup_float_type("float64"); |
e440a328 | 2132 | } |
2133 | else if (this->type_ != NULL && this->type_->complex_type() != NULL) | |
2134 | { | |
2135 | // We are converting to an abstract complex type. | |
48c2a53a | 2136 | resolved_type = Type::lookup_complex_type("complex128"); |
e440a328 | 2137 | } |
2138 | else | |
2139 | { | |
2140 | // If we still have an abstract type here, then this is being | |
2141 | // used in a constant expression which didn't get reduced for | |
2142 | // some reason. Use a type which will fit the value. We use <, | |
2143 | // not <=, because we need an extra bit for the sign bit. | |
2144 | int bits = mpz_sizeinbase(this->val_, 2); | |
1b1f2abf | 2145 | Type* int_type = Type::lookup_integer_type("int"); |
2146 | if (bits < int_type->integer_type()->bits()) | |
48c2a53a | 2147 | resolved_type = int_type; |
e440a328 | 2148 | else if (bits < 64) |
48c2a53a | 2149 | resolved_type = Type::lookup_integer_type("int64"); |
e440a328 | 2150 | else |
48c2a53a | 2151 | { |
2152 | if (!saw_errors()) | |
631d5788 | 2153 | go_error_at(this->location(), |
2154 | "unknown type for large integer constant"); | |
ea664253 | 2155 | return context->gogo()->backend()->error_expression(); |
48c2a53a | 2156 | } |
e440a328 | 2157 | } |
48c2a53a | 2158 | Numeric_constant nc; |
2159 | nc.set_int(resolved_type, this->val_); | |
ea664253 | 2160 | return Expression::backend_numeric_constant_expression(context, &nc); |
e440a328 | 2161 | } |
2162 | ||
2163 | // Write VAL to export data. | |
2164 | ||
2165 | void | |
8b1c301d | 2166 | Integer_expression::export_integer(String_dump* exp, const mpz_t val) |
e440a328 | 2167 | { |
2168 | char* s = mpz_get_str(NULL, 10, val); | |
2169 | exp->write_c_string(s); | |
2170 | free(s); | |
2171 | } | |
2172 | ||
2173 | // Export an integer in a constant expression. | |
2174 | ||
2175 | void | |
548be246 | 2176 | Integer_expression::do_export(Export_function_body* efb) const |
e440a328 | 2177 | { |
69f634cc | 2178 | bool added_type = false; |
2179 | if (this->type_ != NULL | |
2180 | && !this->type_->is_abstract() | |
2181 | && this->type_ != efb->type_context()) | |
2182 | { | |
2183 | efb->write_c_string("$convert("); | |
2184 | efb->write_type(this->type_); | |
2185 | efb->write_c_string(", "); | |
2186 | added_type = true; | |
2187 | } | |
2188 | ||
548be246 | 2189 | Integer_expression::export_integer(efb, this->val_); |
5d4b8566 | 2190 | if (this->is_character_constant_) |
548be246 | 2191 | efb->write_c_string("'"); |
e440a328 | 2192 | // A trailing space lets us reliably identify the end of the number. |
548be246 | 2193 | efb->write_c_string(" "); |
69f634cc | 2194 | |
2195 | if (added_type) | |
2196 | efb->write_c_string(")"); | |
e440a328 | 2197 | } |
2198 | ||
2199 | // Import an integer, floating point, or complex value. This handles | |
2200 | // all these types because they all start with digits. | |
2201 | ||
2202 | Expression* | |
bc8e2ef4 | 2203 | Integer_expression::do_import(Import_expression* imp, Location loc) |
e440a328 | 2204 | { |
2205 | std::string num = imp->read_identifier(); | |
2206 | imp->require_c_string(" "); | |
2207 | if (!num.empty() && num[num.length() - 1] == 'i') | |
2208 | { | |
2209 | mpfr_t real; | |
2210 | size_t plus_pos = num.find('+', 1); | |
2211 | size_t minus_pos = num.find('-', 1); | |
2212 | size_t pos; | |
2213 | if (plus_pos == std::string::npos) | |
2214 | pos = minus_pos; | |
2215 | else if (minus_pos == std::string::npos) | |
2216 | pos = plus_pos; | |
2217 | else | |
2218 | { | |
631d5788 | 2219 | go_error_at(imp->location(), "bad number in import data: %qs", |
2220 | num.c_str()); | |
9b92780c | 2221 | return Expression::make_error(loc); |
e440a328 | 2222 | } |
2223 | if (pos == std::string::npos) | |
2224 | mpfr_set_ui(real, 0, GMP_RNDN); | |
2225 | else | |
2226 | { | |
2227 | std::string real_str = num.substr(0, pos); | |
2228 | if (mpfr_init_set_str(real, real_str.c_str(), 10, GMP_RNDN) != 0) | |
2229 | { | |
631d5788 | 2230 | go_error_at(imp->location(), "bad number in import data: %qs", |
2231 | real_str.c_str()); | |
9b92780c | 2232 | return Expression::make_error(loc); |
e440a328 | 2233 | } |
2234 | } | |
2235 | ||
2236 | std::string imag_str; | |
2237 | if (pos == std::string::npos) | |
2238 | imag_str = num; | |
2239 | else | |
2240 | imag_str = num.substr(pos); | |
2241 | imag_str = imag_str.substr(0, imag_str.size() - 1); | |
2242 | mpfr_t imag; | |
2243 | if (mpfr_init_set_str(imag, imag_str.c_str(), 10, GMP_RNDN) != 0) | |
2244 | { | |
631d5788 | 2245 | go_error_at(imp->location(), "bad number in import data: %qs", |
2246 | imag_str.c_str()); | |
9b92780c | 2247 | return Expression::make_error(loc); |
e440a328 | 2248 | } |
fcbea5e4 | 2249 | mpc_t cval; |
2250 | mpc_init2(cval, mpc_precision); | |
2251 | mpc_set_fr_fr(cval, real, imag, MPC_RNDNN); | |
e440a328 | 2252 | mpfr_clear(real); |
2253 | mpfr_clear(imag); | |
9b92780c | 2254 | Expression* ret = Expression::make_complex(&cval, NULL, loc); |
fcbea5e4 | 2255 | mpc_clear(cval); |
e440a328 | 2256 | return ret; |
2257 | } | |
2258 | else if (num.find('.') == std::string::npos | |
2259 | && num.find('E') == std::string::npos) | |
2260 | { | |
5d4b8566 | 2261 | bool is_character_constant = (!num.empty() |
2262 | && num[num.length() - 1] == '\''); | |
2263 | if (is_character_constant) | |
2264 | num = num.substr(0, num.length() - 1); | |
e440a328 | 2265 | mpz_t val; |
2266 | if (mpz_init_set_str(val, num.c_str(), 10) != 0) | |
2267 | { | |
631d5788 | 2268 | go_error_at(imp->location(), "bad number in import data: %qs", |
2269 | num.c_str()); | |
9b92780c | 2270 | return Expression::make_error(loc); |
e440a328 | 2271 | } |
5d4b8566 | 2272 | Expression* ret; |
2273 | if (is_character_constant) | |
9b92780c | 2274 | ret = Expression::make_character(&val, NULL, loc); |
5d4b8566 | 2275 | else |
9b92780c | 2276 | ret = Expression::make_integer_z(&val, NULL, loc); |
e440a328 | 2277 | mpz_clear(val); |
2278 | return ret; | |
2279 | } | |
2280 | else | |
2281 | { | |
2282 | mpfr_t val; | |
2283 | if (mpfr_init_set_str(val, num.c_str(), 10, GMP_RNDN) != 0) | |
2284 | { | |
631d5788 | 2285 | go_error_at(imp->location(), "bad number in import data: %qs", |
2286 | num.c_str()); | |
9b92780c | 2287 | return Expression::make_error(loc); |
e440a328 | 2288 | } |
9b92780c | 2289 | Expression* ret = Expression::make_float(&val, NULL, loc); |
e440a328 | 2290 | mpfr_clear(val); |
2291 | return ret; | |
2292 | } | |
2293 | } | |
d751bb78 | 2294 | // Ast dump for integer expression. |
2295 | ||
2296 | void | |
2297 | Integer_expression::do_dump_expression(Ast_dump_context* ast_dump_context) const | |
2298 | { | |
5d4b8566 | 2299 | if (this->is_character_constant_) |
2300 | ast_dump_context->ostream() << '\''; | |
8b1c301d | 2301 | Integer_expression::export_integer(ast_dump_context, this->val_); |
5d4b8566 | 2302 | if (this->is_character_constant_) |
2303 | ast_dump_context->ostream() << '\''; | |
d751bb78 | 2304 | } |
2305 | ||
e67508fa | 2306 | // Build a new integer value from a multi-precision integer. |
e440a328 | 2307 | |
2308 | Expression* | |
e67508fa | 2309 | Expression::make_integer_z(const mpz_t* val, Type* type, Location location) |
5d4b8566 | 2310 | { |
2311 | return new Integer_expression(val, type, false, location); | |
2312 | } | |
2313 | ||
e67508fa | 2314 | // Build a new integer value from an unsigned long. |
2315 | ||
2316 | Expression* | |
2317 | Expression::make_integer_ul(unsigned long val, Type *type, Location location) | |
2318 | { | |
2319 | mpz_t zval; | |
2320 | mpz_init_set_ui(zval, val); | |
2321 | Expression* ret = Expression::make_integer_z(&zval, type, location); | |
2322 | mpz_clear(zval); | |
2323 | return ret; | |
2324 | } | |
2325 | ||
2326 | // Build a new integer value from a signed long. | |
2327 | ||
2328 | Expression* | |
2329 | Expression::make_integer_sl(long val, Type *type, Location location) | |
2330 | { | |
2331 | mpz_t zval; | |
2332 | mpz_init_set_si(zval, val); | |
2333 | Expression* ret = Expression::make_integer_z(&zval, type, location); | |
2334 | mpz_clear(zval); | |
2335 | return ret; | |
2336 | } | |
2337 | ||
3f378015 | 2338 | // Store an int64_t in an uninitialized mpz_t. |
2339 | ||
2340 | static void | |
2341 | set_mpz_from_int64(mpz_t* zval, int64_t val) | |
2342 | { | |
2343 | if (val >= 0) | |
2344 | { | |
2345 | unsigned long ul = static_cast<unsigned long>(val); | |
2346 | if (static_cast<int64_t>(ul) == val) | |
2347 | { | |
2348 | mpz_init_set_ui(*zval, ul); | |
2349 | return; | |
2350 | } | |
2351 | } | |
2352 | uint64_t uv; | |
2353 | if (val >= 0) | |
2354 | uv = static_cast<uint64_t>(val); | |
2355 | else | |
2356 | uv = static_cast<uint64_t>(- val); | |
2357 | unsigned long ul = uv & 0xffffffffUL; | |
2358 | mpz_init_set_ui(*zval, ul); | |
2359 | mpz_t hval; | |
2360 | mpz_init_set_ui(hval, static_cast<unsigned long>(uv >> 32)); | |
2361 | mpz_mul_2exp(hval, hval, 32); | |
2362 | mpz_add(*zval, *zval, hval); | |
2363 | mpz_clear(hval); | |
2364 | if (val < 0) | |
2365 | mpz_neg(*zval, *zval); | |
2366 | } | |
2367 | ||
2368 | // Build a new integer value from an int64_t. | |
2369 | ||
2370 | Expression* | |
2371 | Expression::make_integer_int64(int64_t val, Type* type, Location location) | |
2372 | { | |
2373 | mpz_t zval; | |
2374 | set_mpz_from_int64(&zval, val); | |
2375 | Expression* ret = Expression::make_integer_z(&zval, type, location); | |
2376 | mpz_clear(zval); | |
2377 | return ret; | |
2378 | } | |
2379 | ||
5d4b8566 | 2380 | // Build a new character constant value. |
2381 | ||
2382 | Expression* | |
2383 | Expression::make_character(const mpz_t* val, Type* type, Location location) | |
e440a328 | 2384 | { |
5d4b8566 | 2385 | return new Integer_expression(val, type, true, location); |
e440a328 | 2386 | } |
2387 | ||
2388 | // Floats. | |
2389 | ||
2390 | class Float_expression : public Expression | |
2391 | { | |
2392 | public: | |
b13c66cd | 2393 | Float_expression(const mpfr_t* val, Type* type, Location location) |
e440a328 | 2394 | : Expression(EXPRESSION_FLOAT, location), |
2395 | type_(type) | |
2396 | { | |
2397 | mpfr_init_set(this->val_, *val, GMP_RNDN); | |
2398 | } | |
2399 | ||
e440a328 | 2400 | // Write VAL to export data. |
2401 | static void | |
8b1c301d | 2402 | export_float(String_dump* exp, const mpfr_t val); |
2403 | ||
d751bb78 | 2404 | // Write VAL to dump file. |
2405 | static void | |
2406 | dump_float(Ast_dump_context* ast_dump_context, const mpfr_t val); | |
e440a328 | 2407 | |
2408 | protected: | |
2409 | bool | |
2410 | do_is_constant() const | |
2411 | { return true; } | |
2412 | ||
0e168074 | 2413 | bool |
3ae06f68 | 2414 | do_is_static_initializer() const |
0e168074 | 2415 | { return true; } |
2416 | ||
e440a328 | 2417 | bool |
0c77715b | 2418 | do_numeric_constant_value(Numeric_constant* nc) const |
2419 | { | |
2420 | nc->set_float(this->type_, this->val_); | |
2421 | return true; | |
2422 | } | |
e440a328 | 2423 | |
2424 | Type* | |
2425 | do_type(); | |
2426 | ||
2427 | void | |
2428 | do_determine_type(const Type_context*); | |
2429 | ||
2430 | void | |
2431 | do_check_types(Gogo*); | |
2432 | ||
2433 | Expression* | |
2434 | do_copy() | |
de590a61 | 2435 | { return Expression::make_float(&this->val_, |
2436 | (this->type_ == NULL | |
2437 | ? NULL | |
2438 | : this->type_->copy_expressions()), | |
e440a328 | 2439 | this->location()); } |
2440 | ||
ea664253 | 2441 | Bexpression* |
2442 | do_get_backend(Translate_context*); | |
e440a328 | 2443 | |
5f6f5357 | 2444 | int |
2445 | do_inlining_cost() const | |
2446 | { return 1; } | |
2447 | ||
e440a328 | 2448 | void |
548be246 | 2449 | do_export(Export_function_body*) const; |
e440a328 | 2450 | |
d751bb78 | 2451 | void |
2452 | do_dump_expression(Ast_dump_context*) const; | |
2453 | ||
e440a328 | 2454 | private: |
2455 | // The floating point value. | |
2456 | mpfr_t val_; | |
2457 | // The type so far. | |
2458 | Type* type_; | |
2459 | }; | |
2460 | ||
e440a328 | 2461 | // Return the current type. If we haven't set the type yet, we return |
2462 | // an abstract float type. | |
2463 | ||
2464 | Type* | |
2465 | Float_expression::do_type() | |
2466 | { | |
2467 | if (this->type_ == NULL) | |
2468 | this->type_ = Type::make_abstract_float_type(); | |
2469 | return this->type_; | |
2470 | } | |
2471 | ||
2472 | // Set the type of the float value. Here we may switch from an | |
2473 | // abstract type to a real type. | |
2474 | ||
2475 | void | |
2476 | Float_expression::do_determine_type(const Type_context* context) | |
2477 | { | |
2478 | if (this->type_ != NULL && !this->type_->is_abstract()) | |
2479 | ; | |
2480 | else if (context->type != NULL | |
2481 | && (context->type->integer_type() != NULL | |
2482 | || context->type->float_type() != NULL | |
2483 | || context->type->complex_type() != NULL)) | |
2484 | this->type_ = context->type; | |
2485 | else if (!context->may_be_abstract) | |
48080209 | 2486 | this->type_ = Type::lookup_float_type("float64"); |
e440a328 | 2487 | } |
2488 | ||
e440a328 | 2489 | // Check the type of a float value. |
2490 | ||
2491 | void | |
2492 | Float_expression::do_check_types(Gogo*) | |
2493 | { | |
0c77715b | 2494 | Type* type = this->type_; |
2495 | if (type == NULL) | |
e440a328 | 2496 | return; |
0c77715b | 2497 | Numeric_constant nc; |
2498 | nc.set_float(NULL, this->val_); | |
2499 | if (!nc.set_type(this->type_, true, this->location())) | |
e440a328 | 2500 | this->set_is_error(); |
e440a328 | 2501 | } |
2502 | ||
ea664253 | 2503 | // Get the backend representation for a float constant. |
e440a328 | 2504 | |
ea664253 | 2505 | Bexpression* |
2506 | Float_expression::do_get_backend(Translate_context* context) | |
e440a328 | 2507 | { |
12373dd5 | 2508 | if (this->is_error_expression() |
2509 | || (this->type_ != NULL && this->type_->is_error_type())) | |
2510 | { | |
2511 | go_assert(saw_errors()); | |
2512 | return context->gogo()->backend()->error_expression(); | |
2513 | } | |
2514 | ||
48c2a53a | 2515 | Type* resolved_type; |
e440a328 | 2516 | if (this->type_ != NULL && !this->type_->is_abstract()) |
48c2a53a | 2517 | resolved_type = this->type_; |
e440a328 | 2518 | else if (this->type_ != NULL && this->type_->integer_type() != NULL) |
2519 | { | |
2520 | // We have an abstract integer type. We just hope for the best. | |
48c2a53a | 2521 | resolved_type = Type::lookup_integer_type("int"); |
2522 | } | |
2523 | else if (this->type_ != NULL && this->type_->complex_type() != NULL) | |
2524 | { | |
2525 | // We are converting to an abstract complex type. | |
2526 | resolved_type = Type::lookup_complex_type("complex128"); | |
e440a328 | 2527 | } |
2528 | else | |
2529 | { | |
2530 | // If we still have an abstract type here, then this is being | |
2531 | // used in a constant expression which didn't get reduced. We | |
2532 | // just use float64 and hope for the best. | |
48c2a53a | 2533 | resolved_type = Type::lookup_float_type("float64"); |
e440a328 | 2534 | } |
48c2a53a | 2535 | |
2536 | Numeric_constant nc; | |
2537 | nc.set_float(resolved_type, this->val_); | |
ea664253 | 2538 | return Expression::backend_numeric_constant_expression(context, &nc); |
e440a328 | 2539 | } |
2540 | ||
8b1c301d | 2541 | // Write a floating point number to a string dump. |
e440a328 | 2542 | |
2543 | void | |
8b1c301d | 2544 | Float_expression::export_float(String_dump *exp, const mpfr_t val) |
e440a328 | 2545 | { |
2546 | mp_exp_t exponent; | |
2547 | char* s = mpfr_get_str(NULL, &exponent, 10, 0, val, GMP_RNDN); | |
2548 | if (*s == '-') | |
2549 | exp->write_c_string("-"); | |
2550 | exp->write_c_string("0."); | |
2551 | exp->write_c_string(*s == '-' ? s + 1 : s); | |
2552 | mpfr_free_str(s); | |
2553 | char buf[30]; | |
2554 | snprintf(buf, sizeof buf, "E%ld", exponent); | |
2555 | exp->write_c_string(buf); | |
2556 | } | |
2557 | ||
2558 | // Export a floating point number in a constant expression. | |
2559 | ||
2560 | void | |
548be246 | 2561 | Float_expression::do_export(Export_function_body* efb) const |
e440a328 | 2562 | { |
69f634cc | 2563 | bool added_type = false; |
2564 | if (this->type_ != NULL | |
2565 | && !this->type_->is_abstract() | |
2566 | && this->type_ != efb->type_context()) | |
2567 | { | |
2568 | efb->write_c_string("$convert("); | |
2569 | efb->write_type(this->type_); | |
2570 | efb->write_c_string(", "); | |
2571 | added_type = true; | |
2572 | } | |
2573 | ||
548be246 | 2574 | Float_expression::export_float(efb, this->val_); |
e440a328 | 2575 | // A trailing space lets us reliably identify the end of the number. |
548be246 | 2576 | efb->write_c_string(" "); |
69f634cc | 2577 | |
2578 | if (added_type) | |
2579 | efb->write_c_string(")"); | |
e440a328 | 2580 | } |
2581 | ||
d751bb78 | 2582 | // Dump a floating point number to the dump file. |
2583 | ||
2584 | void | |
2585 | Float_expression::do_dump_expression(Ast_dump_context* ast_dump_context) const | |
2586 | { | |
8b1c301d | 2587 | Float_expression::export_float(ast_dump_context, this->val_); |
d751bb78 | 2588 | } |
2589 | ||
e440a328 | 2590 | // Make a float expression. |
2591 | ||
2592 | Expression* | |
b13c66cd | 2593 | Expression::make_float(const mpfr_t* val, Type* type, Location location) |
e440a328 | 2594 | { |
2595 | return new Float_expression(val, type, location); | |
2596 | } | |
2597 | ||
2598 | // Complex numbers. | |
2599 | ||
2600 | class Complex_expression : public Expression | |
2601 | { | |
2602 | public: | |
fcbea5e4 | 2603 | Complex_expression(const mpc_t* val, Type* type, Location location) |
e440a328 | 2604 | : Expression(EXPRESSION_COMPLEX, location), |
2605 | type_(type) | |
2606 | { | |
fcbea5e4 | 2607 | mpc_init2(this->val_, mpc_precision); |
2608 | mpc_set(this->val_, *val, MPC_RNDNN); | |
e440a328 | 2609 | } |
2610 | ||
fcbea5e4 | 2611 | // Write VAL to string dump. |
e440a328 | 2612 | static void |
fcbea5e4 | 2613 | export_complex(String_dump* exp, const mpc_t val); |
e440a328 | 2614 | |
d751bb78 | 2615 | // Write REAL/IMAG to dump context. |
2616 | static void | |
fcbea5e4 | 2617 | dump_complex(Ast_dump_context* ast_dump_context, const mpc_t val); |
d751bb78 | 2618 | |
e440a328 | 2619 | protected: |
2620 | bool | |
2621 | do_is_constant() const | |
2622 | { return true; } | |
2623 | ||
0e168074 | 2624 | bool |
3ae06f68 | 2625 | do_is_static_initializer() const |
0e168074 | 2626 | { return true; } |
2627 | ||
e440a328 | 2628 | bool |
0c77715b | 2629 | do_numeric_constant_value(Numeric_constant* nc) const |
2630 | { | |
fcbea5e4 | 2631 | nc->set_complex(this->type_, this->val_); |
0c77715b | 2632 | return true; |
2633 | } | |
e440a328 | 2634 | |
2635 | Type* | |
2636 | do_type(); | |
2637 | ||
2638 | void | |
2639 | do_determine_type(const Type_context*); | |
2640 | ||
2641 | void | |
2642 | do_check_types(Gogo*); | |
2643 | ||
2644 | Expression* | |
2645 | do_copy() | |
2646 | { | |
de590a61 | 2647 | return Expression::make_complex(&this->val_, |
2648 | (this->type_ == NULL | |
2649 | ? NULL | |
2650 | : this->type_->copy_expressions()), | |
e440a328 | 2651 | this->location()); |
2652 | } | |
2653 | ||
ea664253 | 2654 | Bexpression* |
2655 | do_get_backend(Translate_context*); | |
e440a328 | 2656 | |
5f6f5357 | 2657 | int |
2658 | do_inlining_cost() const | |
2659 | { return 2; } | |
2660 | ||
e440a328 | 2661 | void |
548be246 | 2662 | do_export(Export_function_body*) const; |
e440a328 | 2663 | |
d751bb78 | 2664 | void |
2665 | do_dump_expression(Ast_dump_context*) const; | |
abd26de0 | 2666 | |
e440a328 | 2667 | private: |
fcbea5e4 | 2668 | // The complex value. |
2669 | mpc_t val_; | |
e440a328 | 2670 | // The type if known. |
2671 | Type* type_; | |
2672 | }; | |
2673 | ||
e440a328 | 2674 | // Return the current type. If we haven't set the type yet, we return |
2675 | // an abstract complex type. | |
2676 | ||
2677 | Type* | |
2678 | Complex_expression::do_type() | |
2679 | { | |
2680 | if (this->type_ == NULL) | |
2681 | this->type_ = Type::make_abstract_complex_type(); | |
2682 | return this->type_; | |
2683 | } | |
2684 | ||
2685 | // Set the type of the complex value. Here we may switch from an | |
2686 | // abstract type to a real type. | |
2687 | ||
2688 | void | |
2689 | Complex_expression::do_determine_type(const Type_context* context) | |
2690 | { | |
2691 | if (this->type_ != NULL && !this->type_->is_abstract()) | |
2692 | ; | |
abd26de0 | 2693 | else if (context->type != NULL && context->type->is_numeric_type()) |
e440a328 | 2694 | this->type_ = context->type; |
2695 | else if (!context->may_be_abstract) | |
48080209 | 2696 | this->type_ = Type::lookup_complex_type("complex128"); |
e440a328 | 2697 | } |
2698 | ||
e440a328 | 2699 | // Check the type of a complex value. |
2700 | ||
2701 | void | |
2702 | Complex_expression::do_check_types(Gogo*) | |
2703 | { | |
0c77715b | 2704 | Type* type = this->type_; |
2705 | if (type == NULL) | |
e440a328 | 2706 | return; |
0c77715b | 2707 | Numeric_constant nc; |
fcbea5e4 | 2708 | nc.set_complex(NULL, this->val_); |
0c77715b | 2709 | if (!nc.set_type(this->type_, true, this->location())) |
e440a328 | 2710 | this->set_is_error(); |
2711 | } | |
2712 | ||
ea664253 | 2713 | // Get the backend representation for a complex constant. |
e440a328 | 2714 | |
ea664253 | 2715 | Bexpression* |
2716 | Complex_expression::do_get_backend(Translate_context* context) | |
e440a328 | 2717 | { |
12373dd5 | 2718 | if (this->is_error_expression() |
2719 | || (this->type_ != NULL && this->type_->is_error_type())) | |
2720 | { | |
2721 | go_assert(saw_errors()); | |
2722 | return context->gogo()->backend()->error_expression(); | |
2723 | } | |
2724 | ||
48c2a53a | 2725 | Type* resolved_type; |
e440a328 | 2726 | if (this->type_ != NULL && !this->type_->is_abstract()) |
48c2a53a | 2727 | resolved_type = this->type_; |
2728 | else if (this->type_ != NULL && this->type_->integer_type() != NULL) | |
2729 | { | |
2730 | // We are converting to an abstract integer type. | |
2731 | resolved_type = Type::lookup_integer_type("int"); | |
2732 | } | |
2733 | else if (this->type_ != NULL && this->type_->float_type() != NULL) | |
2734 | { | |
2735 | // We are converting to an abstract float type. | |
2736 | resolved_type = Type::lookup_float_type("float64"); | |
2737 | } | |
e440a328 | 2738 | else |
2739 | { | |
47ae02b7 | 2740 | // If we still have an abstract type here, this is being |
e440a328 | 2741 | // used in a constant expression which didn't get reduced. We |
2742 | // just use complex128 and hope for the best. | |
48c2a53a | 2743 | resolved_type = Type::lookup_complex_type("complex128"); |
e440a328 | 2744 | } |
48c2a53a | 2745 | |
2746 | Numeric_constant nc; | |
fcbea5e4 | 2747 | nc.set_complex(resolved_type, this->val_); |
ea664253 | 2748 | return Expression::backend_numeric_constant_expression(context, &nc); |
e440a328 | 2749 | } |
2750 | ||
2751 | // Write REAL/IMAG to export data. | |
2752 | ||
2753 | void | |
fcbea5e4 | 2754 | Complex_expression::export_complex(String_dump* exp, const mpc_t val) |
e440a328 | 2755 | { |
fcbea5e4 | 2756 | if (!mpfr_zero_p(mpc_realref(val))) |
e440a328 | 2757 | { |
fcbea5e4 | 2758 | Float_expression::export_float(exp, mpc_realref(val)); |
d1db782d | 2759 | if (mpfr_sgn(mpc_imagref(val)) >= 0) |
e440a328 | 2760 | exp->write_c_string("+"); |
2761 | } | |
fcbea5e4 | 2762 | Float_expression::export_float(exp, mpc_imagref(val)); |
e440a328 | 2763 | exp->write_c_string("i"); |
2764 | } | |
2765 | ||
2766 | // Export a complex number in a constant expression. | |
2767 | ||
2768 | void | |
548be246 | 2769 | Complex_expression::do_export(Export_function_body* efb) const |
e440a328 | 2770 | { |
69f634cc | 2771 | bool added_type = false; |
2772 | if (this->type_ != NULL | |
2773 | && !this->type_->is_abstract() | |
2774 | && this->type_ != efb->type_context()) | |
2775 | { | |
2776 | efb->write_c_string("$convert("); | |
2777 | efb->write_type(this->type_); | |
2778 | efb->write_c_string(", "); | |
2779 | added_type = true; | |
2780 | } | |
2781 | ||
548be246 | 2782 | Complex_expression::export_complex(efb, this->val_); |
e440a328 | 2783 | // A trailing space lets us reliably identify the end of the number. |
548be246 | 2784 | efb->write_c_string(" "); |
69f634cc | 2785 | |
2786 | if (added_type) | |
2787 | efb->write_c_string(")"); | |
e440a328 | 2788 | } |
2789 | ||
d751bb78 | 2790 | // Dump a complex expression to the dump file. |
2791 | ||
2792 | void | |
2793 | Complex_expression::do_dump_expression(Ast_dump_context* ast_dump_context) const | |
2794 | { | |
fcbea5e4 | 2795 | Complex_expression::export_complex(ast_dump_context, this->val_); |
d751bb78 | 2796 | } |
2797 | ||
e440a328 | 2798 | // Make a complex expression. |
2799 | ||
2800 | Expression* | |
fcbea5e4 | 2801 | Expression::make_complex(const mpc_t* val, Type* type, Location location) |
e440a328 | 2802 | { |
fcbea5e4 | 2803 | return new Complex_expression(val, type, location); |
e440a328 | 2804 | } |
2805 | ||
d5b605df | 2806 | // Find a named object in an expression. |
2807 | ||
2808 | class Find_named_object : public Traverse | |
2809 | { | |
2810 | public: | |
2811 | Find_named_object(Named_object* no) | |
2812 | : Traverse(traverse_expressions), | |
2813 | no_(no), found_(false) | |
2814 | { } | |
2815 | ||
2816 | // Whether we found the object. | |
2817 | bool | |
2818 | found() const | |
2819 | { return this->found_; } | |
2820 | ||
2821 | protected: | |
2822 | int | |
2823 | expression(Expression**); | |
2824 | ||
2825 | private: | |
2826 | // The object we are looking for. | |
2827 | Named_object* no_; | |
2828 | // Whether we found it. | |
2829 | bool found_; | |
2830 | }; | |
2831 | ||
e440a328 | 2832 | // A reference to a const in an expression. |
2833 | ||
2834 | class Const_expression : public Expression | |
2835 | { | |
2836 | public: | |
b13c66cd | 2837 | Const_expression(Named_object* constant, Location location) |
e440a328 | 2838 | : Expression(EXPRESSION_CONST_REFERENCE, location), |
13e818f5 | 2839 | constant_(constant), type_(NULL), seen_(false) |
e440a328 | 2840 | { } |
2841 | ||
d5b605df | 2842 | Named_object* |
2843 | named_object() | |
2844 | { return this->constant_; } | |
2845 | ||
a7f064d5 | 2846 | // Check that the initializer does not refer to the constant itself. |
2847 | void | |
2848 | check_for_init_loop(); | |
2849 | ||
e440a328 | 2850 | protected: |
ba4aedd4 | 2851 | int |
2852 | do_traverse(Traverse*); | |
2853 | ||
e440a328 | 2854 | Expression* |
ceeb4318 | 2855 | do_lower(Gogo*, Named_object*, Statement_inserter*, int); |
e440a328 | 2856 | |
2857 | bool | |
2858 | do_is_constant() const | |
2859 | { return true; } | |
2860 | ||
0e168074 | 2861 | bool |
3ae06f68 | 2862 | do_is_static_initializer() const |
0e168074 | 2863 | { return true; } |
2864 | ||
e440a328 | 2865 | bool |
0c77715b | 2866 | do_numeric_constant_value(Numeric_constant* nc) const; |
e440a328 | 2867 | |
2868 | bool | |
af6b489a | 2869 | do_string_constant_value(std::string* val) const; |
e440a328 | 2870 | |
2871 | Type* | |
2872 | do_type(); | |
2873 | ||
2874 | // The type of a const is set by the declaration, not the use. | |
2875 | void | |
2876 | do_determine_type(const Type_context*); | |
2877 | ||
2878 | void | |
2879 | do_check_types(Gogo*); | |
2880 | ||
2881 | Expression* | |
2882 | do_copy() | |
2883 | { return this; } | |
2884 | ||
ea664253 | 2885 | Bexpression* |
2886 | do_get_backend(Translate_context* context); | |
e440a328 | 2887 | |
2888 | // When exporting a reference to a const as part of a const | |
2889 | // expression, we export the value. We ignore the fact that it has | |
2890 | // a name. | |
2891 | void | |
548be246 | 2892 | do_export(Export_function_body* efb) const |
2893 | { this->constant_->const_value()->expr()->export_expression(efb); } | |
e440a328 | 2894 | |
d751bb78 | 2895 | void |
2896 | do_dump_expression(Ast_dump_context*) const; | |
2897 | ||
e440a328 | 2898 | private: |
2899 | // The constant. | |
2900 | Named_object* constant_; | |
2901 | // The type of this reference. This is used if the constant has an | |
2902 | // abstract type. | |
2903 | Type* type_; | |
13e818f5 | 2904 | // Used to prevent infinite recursion when a constant incorrectly |
2905 | // refers to itself. | |
2906 | mutable bool seen_; | |
e440a328 | 2907 | }; |
2908 | ||
ba4aedd4 | 2909 | // Traversal. |
2910 | ||
2911 | int | |
2912 | Const_expression::do_traverse(Traverse* traverse) | |
2913 | { | |
2914 | if (this->type_ != NULL) | |
2915 | return Type::traverse(this->type_, traverse); | |
2916 | return TRAVERSE_CONTINUE; | |
2917 | } | |
2918 | ||
e440a328 | 2919 | // Lower a constant expression. This is where we convert the |
2920 | // predeclared constant iota into an integer value. | |
2921 | ||
2922 | Expression* | |
ceeb4318 | 2923 | Const_expression::do_lower(Gogo* gogo, Named_object*, |
2924 | Statement_inserter*, int iota_value) | |
e440a328 | 2925 | { |
2926 | if (this->constant_->const_value()->expr()->classification() | |
2927 | == EXPRESSION_IOTA) | |
2928 | { | |
2929 | if (iota_value == -1) | |
2930 | { | |
631d5788 | 2931 | go_error_at(this->location(), |
2932 | "iota is only defined in const declarations"); | |
e440a328 | 2933 | iota_value = 0; |
2934 | } | |
e67508fa | 2935 | return Expression::make_integer_ul(iota_value, NULL, this->location()); |
e440a328 | 2936 | } |
2937 | ||
2938 | // Make sure that the constant itself has been lowered. | |
2939 | gogo->lower_constant(this->constant_); | |
2940 | ||
2941 | return this; | |
2942 | } | |
2943 | ||
0c77715b | 2944 | // Return a numeric constant value. |
e440a328 | 2945 | |
2946 | bool | |
0c77715b | 2947 | Const_expression::do_numeric_constant_value(Numeric_constant* nc) const |
e440a328 | 2948 | { |
13e818f5 | 2949 | if (this->seen_) |
2950 | return false; | |
2951 | ||
e440a328 | 2952 | Expression* e = this->constant_->const_value()->expr(); |
f03a9fbf | 2953 | |
13e818f5 | 2954 | this->seen_ = true; |
2955 | ||
0c77715b | 2956 | bool r = e->numeric_constant_value(nc); |
e440a328 | 2957 | |
13e818f5 | 2958 | this->seen_ = false; |
2959 | ||
e440a328 | 2960 | Type* ctype; |
2961 | if (this->type_ != NULL) | |
2962 | ctype = this->type_; | |
2963 | else | |
2964 | ctype = this->constant_->const_value()->type(); | |
e440a328 | 2965 | if (r && ctype != NULL) |
2966 | { | |
0c77715b | 2967 | if (!nc->set_type(ctype, false, this->location())) |
e440a328 | 2968 | return false; |
e440a328 | 2969 | } |
e440a328 | 2970 | |
e440a328 | 2971 | return r; |
2972 | } | |
2973 | ||
af6b489a | 2974 | bool |
2975 | Const_expression::do_string_constant_value(std::string* val) const | |
2976 | { | |
2977 | if (this->seen_) | |
2978 | return false; | |
2979 | ||
2980 | Expression* e = this->constant_->const_value()->expr(); | |
2981 | ||
2982 | this->seen_ = true; | |
2983 | bool ok = e->string_constant_value(val); | |
2984 | this->seen_ = false; | |
2985 | ||
2986 | return ok; | |
2987 | } | |
2988 | ||
e440a328 | 2989 | // Return the type of the const reference. |
2990 | ||
2991 | Type* | |
2992 | Const_expression::do_type() | |
2993 | { | |
2994 | if (this->type_ != NULL) | |
2995 | return this->type_; | |
13e818f5 | 2996 | |
2f78f012 | 2997 | Named_constant* nc = this->constant_->const_value(); |
2998 | ||
2999 | if (this->seen_ || nc->lowering()) | |
13e818f5 | 3000 | { |
4b2ab536 | 3001 | if (nc->type() == NULL || !nc->type()->is_error_type()) |
3002 | { | |
3003 | Location loc = this->location(); | |
3004 | if (!this->seen_) | |
3005 | loc = nc->location(); | |
3006 | go_error_at(loc, "constant refers to itself"); | |
3007 | } | |
3008 | this->set_is_error(); | |
13e818f5 | 3009 | this->type_ = Type::make_error_type(); |
4b2ab536 | 3010 | nc->set_type(this->type_); |
13e818f5 | 3011 | return this->type_; |
3012 | } | |
3013 | ||
3014 | this->seen_ = true; | |
3015 | ||
e440a328 | 3016 | Type* ret = nc->type(); |
13e818f5 | 3017 | |
e440a328 | 3018 | if (ret != NULL) |
13e818f5 | 3019 | { |
3020 | this->seen_ = false; | |
3021 | return ret; | |
3022 | } | |
3023 | ||
e440a328 | 3024 | // During parsing, a named constant may have a NULL type, but we |
3025 | // must not return a NULL type here. | |
13e818f5 | 3026 | ret = nc->expr()->type(); |
3027 | ||
3028 | this->seen_ = false; | |
3029 | ||
4b2ab536 | 3030 | if (ret->is_error_type()) |
3031 | nc->set_type(ret); | |
3032 | ||
13e818f5 | 3033 | return ret; |
e440a328 | 3034 | } |
3035 | ||
3036 | // Set the type of the const reference. | |
3037 | ||
3038 | void | |
3039 | Const_expression::do_determine_type(const Type_context* context) | |
3040 | { | |
3041 | Type* ctype = this->constant_->const_value()->type(); | |
3042 | Type* cetype = (ctype != NULL | |
3043 | ? ctype | |
3044 | : this->constant_->const_value()->expr()->type()); | |
3045 | if (ctype != NULL && !ctype->is_abstract()) | |
3046 | ; | |
3047 | else if (context->type != NULL | |
0c77715b | 3048 | && context->type->is_numeric_type() |
3049 | && cetype->is_numeric_type()) | |
e440a328 | 3050 | this->type_ = context->type; |
3051 | else if (context->type != NULL | |
3052 | && context->type->is_string_type() | |
3053 | && cetype->is_string_type()) | |
3054 | this->type_ = context->type; | |
3055 | else if (context->type != NULL | |
3056 | && context->type->is_boolean_type() | |
3057 | && cetype->is_boolean_type()) | |
3058 | this->type_ = context->type; | |
3059 | else if (!context->may_be_abstract) | |
3060 | { | |
3061 | if (cetype->is_abstract()) | |
3062 | cetype = cetype->make_non_abstract_type(); | |
3063 | this->type_ = cetype; | |
3064 | } | |
3065 | } | |
3066 | ||
a7f064d5 | 3067 | // Check for a loop in which the initializer of a constant refers to |
3068 | // the constant itself. | |
e440a328 | 3069 | |
3070 | void | |
a7f064d5 | 3071 | Const_expression::check_for_init_loop() |
e440a328 | 3072 | { |
5c13bd80 | 3073 | if (this->type_ != NULL && this->type_->is_error()) |
d5b605df | 3074 | return; |
3075 | ||
a7f064d5 | 3076 | if (this->seen_) |
3077 | { | |
3078 | this->report_error(_("constant refers to itself")); | |
3079 | this->type_ = Type::make_error_type(); | |
3080 | return; | |
3081 | } | |
3082 | ||
d5b605df | 3083 | Expression* init = this->constant_->const_value()->expr(); |
3084 | Find_named_object find_named_object(this->constant_); | |
a7f064d5 | 3085 | |
3086 | this->seen_ = true; | |
d5b605df | 3087 | Expression::traverse(&init, &find_named_object); |
a7f064d5 | 3088 | this->seen_ = false; |
3089 | ||
d5b605df | 3090 | if (find_named_object.found()) |
3091 | { | |
5c13bd80 | 3092 | if (this->type_ == NULL || !this->type_->is_error()) |
a7f064d5 | 3093 | { |
3094 | this->report_error(_("constant refers to itself")); | |
3095 | this->type_ = Type::make_error_type(); | |
3096 | } | |
d5b605df | 3097 | return; |
3098 | } | |
a7f064d5 | 3099 | } |
3100 | ||
3101 | // Check types of a const reference. | |
3102 | ||
3103 | void | |
3104 | Const_expression::do_check_types(Gogo*) | |
3105 | { | |
5c13bd80 | 3106 | if (this->type_ != NULL && this->type_->is_error()) |
a7f064d5 | 3107 | return; |
3108 | ||
3109 | this->check_for_init_loop(); | |
d5b605df | 3110 | |
0c77715b | 3111 | // Check that numeric constant fits in type. |
3112 | if (this->type_ != NULL && this->type_->is_numeric_type()) | |
e440a328 | 3113 | { |
0c77715b | 3114 | Numeric_constant nc; |
3115 | if (this->constant_->const_value()->expr()->numeric_constant_value(&nc)) | |
e440a328 | 3116 | { |
0c77715b | 3117 | if (!nc.set_type(this->type_, true, this->location())) |
3118 | this->set_is_error(); | |
e440a328 | 3119 | } |
e440a328 | 3120 | } |
3121 | } | |
3122 | ||
ea664253 | 3123 | // Return the backend representation for a const reference. |
e440a328 | 3124 | |
ea664253 | 3125 | Bexpression* |
3126 | Const_expression::do_get_backend(Translate_context* context) | |
e440a328 | 3127 | { |
12373dd5 | 3128 | if (this->is_error_expression() |
3129 | || (this->type_ != NULL && this->type_->is_error())) | |
3130 | { | |
3131 | go_assert(saw_errors()); | |
3132 | return context->backend()->error_expression(); | |
3133 | } | |
e440a328 | 3134 | |
3135 | // If the type has been set for this expression, but the underlying | |
3136 | // object is an abstract int or float, we try to get the abstract | |
3137 | // value. Otherwise we may lose something in the conversion. | |
f2de4532 | 3138 | Expression* expr = this->constant_->const_value()->expr(); |
e440a328 | 3139 | if (this->type_ != NULL |
0c77715b | 3140 | && this->type_->is_numeric_type() |
a68492b4 | 3141 | && (this->constant_->const_value()->type() == NULL |
3142 | || this->constant_->const_value()->type()->is_abstract())) | |
e440a328 | 3143 | { |
0c77715b | 3144 | Numeric_constant nc; |
3145 | if (expr->numeric_constant_value(&nc) | |
3146 | && nc.set_type(this->type_, false, this->location())) | |
e440a328 | 3147 | { |
0c77715b | 3148 | Expression* e = nc.expression(this->location()); |
ea664253 | 3149 | return e->get_backend(context); |
e440a328 | 3150 | } |
e440a328 | 3151 | } |
3152 | ||
2c809f8f | 3153 | if (this->type_ != NULL) |
f2de4532 | 3154 | expr = Expression::make_cast(this->type_, expr, this->location()); |
ea664253 | 3155 | return expr->get_backend(context); |
e440a328 | 3156 | } |
3157 | ||
d751bb78 | 3158 | // Dump ast representation for constant expression. |
3159 | ||
3160 | void | |
3161 | Const_expression::do_dump_expression(Ast_dump_context* ast_dump_context) const | |
3162 | { | |
3163 | ast_dump_context->ostream() << this->constant_->name(); | |
3164 | } | |
3165 | ||
e440a328 | 3166 | // Make a reference to a constant in an expression. |
3167 | ||
3168 | Expression* | |
3169 | Expression::make_const_reference(Named_object* constant, | |
b13c66cd | 3170 | Location location) |
e440a328 | 3171 | { |
3172 | return new Const_expression(constant, location); | |
3173 | } | |
3174 | ||
d5b605df | 3175 | // Find a named object in an expression. |
3176 | ||
3177 | int | |
3178 | Find_named_object::expression(Expression** pexpr) | |
3179 | { | |
3180 | switch ((*pexpr)->classification()) | |
3181 | { | |
3182 | case Expression::EXPRESSION_CONST_REFERENCE: | |
a7f064d5 | 3183 | { |
3184 | Const_expression* ce = static_cast<Const_expression*>(*pexpr); | |
3185 | if (ce->named_object() == this->no_) | |
3186 | break; | |
3187 | ||
3188 | // We need to check a constant initializer explicitly, as | |
3189 | // loops here will not be caught by the loop checking for | |
3190 | // variable initializers. | |
3191 | ce->check_for_init_loop(); | |
3192 | ||
3193 | return TRAVERSE_CONTINUE; | |
3194 | } | |
3195 | ||
d5b605df | 3196 | case Expression::EXPRESSION_VAR_REFERENCE: |
3197 | if ((*pexpr)->var_expression()->named_object() == this->no_) | |
3198 | break; | |
3199 | return TRAVERSE_CONTINUE; | |
3200 | case Expression::EXPRESSION_FUNC_REFERENCE: | |
3201 | if ((*pexpr)->func_expression()->named_object() == this->no_) | |
3202 | break; | |
3203 | return TRAVERSE_CONTINUE; | |
3204 | default: | |
3205 | return TRAVERSE_CONTINUE; | |
3206 | } | |
3207 | this->found_ = true; | |
3208 | return TRAVERSE_EXIT; | |
3209 | } | |
3210 | ||
e440a328 | 3211 | // The nil value. |
3212 | ||
3213 | class Nil_expression : public Expression | |
3214 | { | |
3215 | public: | |
b13c66cd | 3216 | Nil_expression(Location location) |
e440a328 | 3217 | : Expression(EXPRESSION_NIL, location) |
3218 | { } | |
3219 | ||
3220 | static Expression* | |
bc8e2ef4 | 3221 | do_import(Import_expression*, Location); |
e440a328 | 3222 | |
3223 | protected: | |
3224 | bool | |
3225 | do_is_constant() const | |
3226 | { return true; } | |
3227 | ||
f9ca30f9 | 3228 | bool |
3ae06f68 | 3229 | do_is_static_initializer() const |
f9ca30f9 | 3230 | { return true; } |
3231 | ||
e440a328 | 3232 | Type* |
3233 | do_type() | |
3234 | { return Type::make_nil_type(); } | |
3235 | ||
3236 | void | |
3237 | do_determine_type(const Type_context*) | |
3238 | { } | |
3239 | ||
3240 | Expression* | |
3241 | do_copy() | |
3242 | { return this; } | |
3243 | ||
ea664253 | 3244 | Bexpression* |
3245 | do_get_backend(Translate_context* context) | |
3246 | { return context->backend()->nil_pointer_expression(); } | |
e440a328 | 3247 | |
5f6f5357 | 3248 | int |
3249 | do_inlining_cost() const | |
3250 | { return 1; } | |
3251 | ||
e440a328 | 3252 | void |
548be246 | 3253 | do_export(Export_function_body* efb) const |
204d4af4 | 3254 | { efb->write_c_string("$nil"); } |
d751bb78 | 3255 | |
3256 | void | |
3257 | do_dump_expression(Ast_dump_context* ast_dump_context) const | |
3258 | { ast_dump_context->ostream() << "nil"; } | |
e440a328 | 3259 | }; |
3260 | ||
3261 | // Import a nil expression. | |
3262 | ||
3263 | Expression* | |
bc8e2ef4 | 3264 | Nil_expression::do_import(Import_expression* imp, Location loc) |
e440a328 | 3265 | { |
204d4af4 | 3266 | if (imp->version() >= EXPORT_FORMAT_V3) |
3267 | imp->require_c_string("$"); | |
e440a328 | 3268 | imp->require_c_string("nil"); |
9b92780c | 3269 | return Expression::make_nil(loc); |
e440a328 | 3270 | } |
3271 | ||
3272 | // Make a nil expression. | |
3273 | ||
3274 | Expression* | |
b13c66cd | 3275 | Expression::make_nil(Location location) |
e440a328 | 3276 | { |
3277 | return new Nil_expression(location); | |
3278 | } | |
3279 | ||
3280 | // The value of the predeclared constant iota. This is little more | |
3281 | // than a marker. This will be lowered to an integer in | |
3282 | // Const_expression::do_lower, which is where we know the value that | |
3283 | // it should have. | |
3284 | ||
3285 | class Iota_expression : public Parser_expression | |
3286 | { | |
3287 | public: | |
b13c66cd | 3288 | Iota_expression(Location location) |
e440a328 | 3289 | : Parser_expression(EXPRESSION_IOTA, location) |
3290 | { } | |
3291 | ||
3292 | protected: | |
3293 | Expression* | |
ceeb4318 | 3294 | do_lower(Gogo*, Named_object*, Statement_inserter*, int) |
c3e6f413 | 3295 | { go_unreachable(); } |
e440a328 | 3296 | |
3297 | // There should only ever be one of these. | |
3298 | Expression* | |
3299 | do_copy() | |
c3e6f413 | 3300 | { go_unreachable(); } |
f03a9fbf | 3301 | |
d751bb78 | 3302 | void |
3303 | do_dump_expression(Ast_dump_context* ast_dump_context) const | |
f03a9fbf | 3304 | { ast_dump_context->ostream() << "iota"; } |
e440a328 | 3305 | }; |
3306 | ||
3307 | // Make an iota expression. This is only called for one case: the | |
3308 | // value of the predeclared constant iota. | |
3309 | ||
3310 | Expression* | |
3311 | Expression::make_iota() | |
3312 | { | |
b13c66cd | 3313 | static Iota_expression iota_expression(Linemap::unknown_location()); |
e440a328 | 3314 | return &iota_expression; |
3315 | } | |
3316 | ||
da244e59 | 3317 | // Class Type_conversion_expression. |
e440a328 | 3318 | |
3319 | // Traversal. | |
3320 | ||
3321 | int | |
3322 | Type_conversion_expression::do_traverse(Traverse* traverse) | |
3323 | { | |
3324 | if (Expression::traverse(&this->expr_, traverse) == TRAVERSE_EXIT | |
3325 | || Type::traverse(this->type_, traverse) == TRAVERSE_EXIT) | |
3326 | return TRAVERSE_EXIT; | |
3327 | return TRAVERSE_CONTINUE; | |
3328 | } | |
3329 | ||
3330 | // Convert to a constant at lowering time. | |
3331 | ||
3332 | Expression* | |
ceeb4318 | 3333 | Type_conversion_expression::do_lower(Gogo*, Named_object*, |
3334 | Statement_inserter*, int) | |
e440a328 | 3335 | { |
3336 | Type* type = this->type_; | |
3337 | Expression* val = this->expr_; | |
b13c66cd | 3338 | Location location = this->location(); |
e440a328 | 3339 | |
0c77715b | 3340 | if (type->is_numeric_type()) |
e440a328 | 3341 | { |
0c77715b | 3342 | Numeric_constant nc; |
3343 | if (val->numeric_constant_value(&nc)) | |
e440a328 | 3344 | { |
0c77715b | 3345 | if (!nc.set_type(type, true, location)) |
3346 | return Expression::make_error(location); | |
3347 | return nc.expression(location); | |
e440a328 | 3348 | } |
e440a328 | 3349 | } |
3350 | ||
d7739c9a | 3351 | // According to the language specification on string conversions |
3352 | // (http://golang.org/ref/spec#Conversions_to_and_from_a_string_type): | |
3353 | // When converting an integer into a string, the string will be a UTF-8 | |
3354 | // representation of the integer and integers "outside the range of valid | |
3355 | // Unicode code points are converted to '\uFFFD'." | |
3356 | if (type->is_string_type()) | |
3357 | { | |
3358 | Numeric_constant nc; | |
3359 | if (val->numeric_constant_value(&nc) && nc.is_int()) | |
3360 | { | |
3361 | // An integer value doesn't fit in the Unicode code point range if it | |
3362 | // overflows the Go "int" type or is negative. | |
3363 | unsigned long ul; | |
3364 | if (!nc.set_type(Type::lookup_integer_type("int"), false, location) | |
3365 | || nc.to_unsigned_long(&ul) == Numeric_constant::NC_UL_NEGATIVE) | |
3366 | return Expression::make_string("\ufffd", location); | |
3367 | } | |
3368 | } | |
3369 | ||
55072f2b | 3370 | if (type->is_slice_type()) |
e440a328 | 3371 | { |
3372 | Type* element_type = type->array_type()->element_type()->forwarded(); | |
60963afd | 3373 | bool is_byte = (element_type->integer_type() != NULL |
3374 | && element_type->integer_type()->is_byte()); | |
3375 | bool is_rune = (element_type->integer_type() != NULL | |
3376 | && element_type->integer_type()->is_rune()); | |
3377 | if (is_byte || is_rune) | |
e440a328 | 3378 | { |
3379 | std::string s; | |
3380 | if (val->string_constant_value(&s)) | |
3381 | { | |
3382 | Expression_list* vals = new Expression_list(); | |
3383 | if (is_byte) | |
3384 | { | |
3385 | for (std::string::const_iterator p = s.begin(); | |
3386 | p != s.end(); | |
3387 | p++) | |
3388 | { | |
e67508fa | 3389 | unsigned char c = static_cast<unsigned char>(*p); |
3390 | vals->push_back(Expression::make_integer_ul(c, | |
3391 | element_type, | |
3392 | location)); | |
e440a328 | 3393 | } |
3394 | } | |
3395 | else | |
3396 | { | |
3397 | const char *p = s.data(); | |
3398 | const char *pend = s.data() + s.length(); | |
3399 | while (p < pend) | |
3400 | { | |
3401 | unsigned int c; | |
3402 | int adv = Lex::fetch_char(p, &c); | |
3403 | if (adv == 0) | |
3404 | { | |
631d5788 | 3405 | go_warning_at(this->location(), 0, |
e440a328 | 3406 | "invalid UTF-8 encoding"); |
3407 | adv = 1; | |
3408 | } | |
3409 | p += adv; | |
e67508fa | 3410 | vals->push_back(Expression::make_integer_ul(c, |
3411 | element_type, | |
3412 | location)); | |
e440a328 | 3413 | } |
3414 | } | |
3415 | ||
3416 | return Expression::make_slice_composite_literal(type, vals, | |
3417 | location); | |
3418 | } | |
3419 | } | |
3420 | } | |
3421 | ||
3422 | return this; | |
3423 | } | |
3424 | ||
35a54f17 | 3425 | // Flatten a type conversion by using a temporary variable for the slice |
3426 | // in slice to string conversions. | |
3427 | ||
3428 | Expression* | |
3429 | Type_conversion_expression::do_flatten(Gogo*, Named_object*, | |
3430 | Statement_inserter* inserter) | |
3431 | { | |
5bf8be8b | 3432 | if (this->type()->is_error_type() || this->expr_->is_error_expression()) |
3433 | { | |
3434 | go_assert(saw_errors()); | |
3435 | return Expression::make_error(this->location()); | |
3436 | } | |
3437 | ||
2c809f8f | 3438 | if (((this->type()->is_string_type() |
3439 | && this->expr_->type()->is_slice_type()) | |
8ba8cc87 | 3440 | || this->expr_->type()->interface_type() != NULL) |
35a54f17 | 3441 | && !this->expr_->is_variable()) |
3442 | { | |
3443 | Temporary_statement* temp = | |
3444 | Statement::make_temporary(NULL, this->expr_, this->location()); | |
3445 | inserter->insert(temp); | |
3446 | this->expr_ = Expression::make_temporary_reference(temp, this->location()); | |
3447 | } | |
3448 | return this; | |
3449 | } | |
3450 | ||
1ca01a59 | 3451 | // Return whether a type conversion is a constant. |
3452 | ||
3453 | bool | |
3454 | Type_conversion_expression::do_is_constant() const | |
3455 | { | |
3456 | if (!this->expr_->is_constant()) | |
3457 | return false; | |
3458 | ||
3459 | // A conversion to a type that may not be used as a constant is not | |
3460 | // a constant. For example, []byte(nil). | |
3461 | Type* type = this->type_; | |
3462 | if (type->integer_type() == NULL | |
3463 | && type->float_type() == NULL | |
3464 | && type->complex_type() == NULL | |
3465 | && !type->is_boolean_type() | |
3466 | && !type->is_string_type()) | |
3467 | return false; | |
3468 | ||
3469 | return true; | |
3470 | } | |
3471 | ||
3ae06f68 | 3472 | // Return whether a type conversion can be used in a constant |
3473 | // initializer. | |
0e168074 | 3474 | |
3475 | bool | |
3ae06f68 | 3476 | Type_conversion_expression::do_is_static_initializer() const |
0e168074 | 3477 | { |
3478 | Type* type = this->type_; | |
3479 | Type* expr_type = this->expr_->type(); | |
3480 | ||
3481 | if (type->interface_type() != NULL | |
3482 | || expr_type->interface_type() != NULL) | |
3483 | return false; | |
3484 | ||
3ae06f68 | 3485 | if (!this->expr_->is_static_initializer()) |
0e168074 | 3486 | return false; |
3487 | ||
3a522dcc | 3488 | if (Type::are_identical(type, expr_type, |
3489 | Type::COMPARE_ERRORS | Type::COMPARE_TAGS, | |
3490 | NULL)) | |
0e168074 | 3491 | return true; |
3492 | ||
03118c21 | 3493 | if (type->is_string_type() && expr_type->is_string_type()) |
3494 | return true; | |
3495 | ||
3496 | if ((type->is_numeric_type() | |
3497 | || type->is_boolean_type() | |
3498 | || type->points_to() != NULL) | |
3499 | && (expr_type->is_numeric_type() | |
3500 | || expr_type->is_boolean_type() | |
3501 | || expr_type->points_to() != NULL)) | |
3502 | return true; | |
3503 | ||
3504 | return false; | |
0e168074 | 3505 | } |
3506 | ||
0c77715b | 3507 | // Return the constant numeric value if there is one. |
e440a328 | 3508 | |
3509 | bool | |
0c77715b | 3510 | Type_conversion_expression::do_numeric_constant_value( |
3511 | Numeric_constant* nc) const | |
e440a328 | 3512 | { |
0c77715b | 3513 | if (!this->type_->is_numeric_type()) |
e440a328 | 3514 | return false; |
0c77715b | 3515 | if (!this->expr_->numeric_constant_value(nc)) |
e440a328 | 3516 | return false; |
0c77715b | 3517 | return nc->set_type(this->type_, false, this->location()); |
e440a328 | 3518 | } |
3519 | ||
3520 | // Return the constant string value if there is one. | |
3521 | ||
3522 | bool | |
3523 | Type_conversion_expression::do_string_constant_value(std::string* val) const | |
3524 | { | |
3525 | if (this->type_->is_string_type() | |
3526 | && this->expr_->type()->integer_type() != NULL) | |
3527 | { | |
0c77715b | 3528 | Numeric_constant nc; |
3529 | if (this->expr_->numeric_constant_value(&nc)) | |
e440a328 | 3530 | { |
0c77715b | 3531 | unsigned long ival; |
3532 | if (nc.to_unsigned_long(&ival) == Numeric_constant::NC_UL_VALID) | |
e440a328 | 3533 | { |
0c77715b | 3534 | val->clear(); |
3535 | Lex::append_char(ival, true, val, this->location()); | |
e440a328 | 3536 | return true; |
3537 | } | |
3538 | } | |
e440a328 | 3539 | } |
3540 | ||
3541 | // FIXME: Could handle conversion from const []int here. | |
3542 | ||
3543 | return false; | |
3544 | } | |
3545 | ||
da244e59 | 3546 | // Determine the resulting type of the conversion. |
3547 | ||
3548 | void | |
3549 | Type_conversion_expression::do_determine_type(const Type_context*) | |
3550 | { | |
3551 | Type_context subcontext(this->type_, false); | |
3552 | this->expr_->determine_type(&subcontext); | |
3553 | } | |
3554 | ||
e440a328 | 3555 | // Check that types are convertible. |
3556 | ||
3557 | void | |
3558 | Type_conversion_expression::do_check_types(Gogo*) | |
3559 | { | |
3560 | Type* type = this->type_; | |
3561 | Type* expr_type = this->expr_->type(); | |
3562 | std::string reason; | |
3563 | ||
5c13bd80 | 3564 | if (type->is_error() || expr_type->is_error()) |
842f6425 | 3565 | { |
842f6425 | 3566 | this->set_is_error(); |
3567 | return; | |
3568 | } | |
3569 | ||
e440a328 | 3570 | if (this->may_convert_function_types_ |
3571 | && type->function_type() != NULL | |
3572 | && expr_type->function_type() != NULL) | |
3573 | return; | |
3574 | ||
3575 | if (Type::are_convertible(type, expr_type, &reason)) | |
3576 | return; | |
3577 | ||
631d5788 | 3578 | go_error_at(this->location(), "%s", reason.c_str()); |
e440a328 | 3579 | this->set_is_error(); |
3580 | } | |
3581 | ||
de590a61 | 3582 | // Copy. |
3583 | ||
3584 | Expression* | |
3585 | Type_conversion_expression::do_copy() | |
3586 | { | |
3587 | return new Type_conversion_expression(this->type_->copy_expressions(), | |
3588 | this->expr_->copy(), | |
3589 | this->location()); | |
3590 | } | |
3591 | ||
ea664253 | 3592 | // Get the backend representation for a type conversion. |
e440a328 | 3593 | |
ea664253 | 3594 | Bexpression* |
3595 | Type_conversion_expression::do_get_backend(Translate_context* context) | |
e440a328 | 3596 | { |
e440a328 | 3597 | Type* type = this->type_; |
3598 | Type* expr_type = this->expr_->type(); | |
2c809f8f | 3599 | |
3600 | Gogo* gogo = context->gogo(); | |
3601 | Btype* btype = type->get_backend(gogo); | |
2c809f8f | 3602 | Location loc = this->location(); |
3603 | ||
3a522dcc | 3604 | if (Type::are_identical(type, expr_type, |
3605 | Type::COMPARE_ERRORS | Type::COMPARE_TAGS, | |
3606 | NULL)) | |
859cdc93 | 3607 | { |
3608 | Bexpression* bexpr = this->expr_->get_backend(context); | |
3609 | return gogo->backend()->convert_expression(btype, bexpr, loc); | |
3610 | } | |
2c809f8f | 3611 | else if (type->interface_type() != NULL |
3612 | || expr_type->interface_type() != NULL) | |
e440a328 | 3613 | { |
2c809f8f | 3614 | Expression* conversion = |
3615 | Expression::convert_for_assignment(gogo, type, this->expr_, | |
3616 | this->location()); | |
ea664253 | 3617 | return conversion->get_backend(context); |
e440a328 | 3618 | } |
3619 | else if (type->is_string_type() | |
3620 | && expr_type->integer_type() != NULL) | |
3621 | { | |
2c809f8f | 3622 | mpz_t intval; |
3623 | Numeric_constant nc; | |
3624 | if (this->expr_->numeric_constant_value(&nc) | |
3625 | && nc.to_int(&intval) | |
3626 | && mpz_fits_ushort_p(intval)) | |
e440a328 | 3627 | { |
e440a328 | 3628 | std::string s; |
2c809f8f | 3629 | Lex::append_char(mpz_get_ui(intval), true, &s, loc); |
3630 | mpz_clear(intval); | |
3631 | Expression* se = Expression::make_string(s, loc); | |
ea664253 | 3632 | return se->get_backend(context); |
e440a328 | 3633 | } |
3634 | ||
f16ab008 | 3635 | Expression* i2s_expr = |
736a16ba | 3636 | Runtime::make_call(Runtime::INTSTRING, loc, 2, |
3637 | Expression::make_nil(loc), this->expr_); | |
ea664253 | 3638 | return Expression::make_cast(type, i2s_expr, loc)->get_backend(context); |
e440a328 | 3639 | } |
55072f2b | 3640 | else if (type->is_string_type() && expr_type->is_slice_type()) |
e440a328 | 3641 | { |
55072f2b | 3642 | Array_type* a = expr_type->array_type(); |
e440a328 | 3643 | Type* e = a->element_type()->forwarded(); |
c484d925 | 3644 | go_assert(e->integer_type() != NULL); |
35a54f17 | 3645 | go_assert(this->expr_->is_variable()); |
3646 | ||
3647 | Runtime::Function code; | |
60963afd | 3648 | if (e->integer_type()->is_byte()) |
736a16ba | 3649 | code = Runtime::SLICEBYTETOSTRING; |
e440a328 | 3650 | else |
35a54f17 | 3651 | { |
3652 | go_assert(e->integer_type()->is_rune()); | |
736a16ba | 3653 | code = Runtime::SLICERUNETOSTRING; |
35a54f17 | 3654 | } |
736a16ba | 3655 | return Runtime::make_call(code, loc, 2, Expression::make_nil(loc), |
3656 | this->expr_)->get_backend(context); | |
e440a328 | 3657 | } |
411eb89e | 3658 | else if (type->is_slice_type() && expr_type->is_string_type()) |
e440a328 | 3659 | { |
3660 | Type* e = type->array_type()->element_type()->forwarded(); | |
c484d925 | 3661 | go_assert(e->integer_type() != NULL); |
6c252e42 | 3662 | |
2c809f8f | 3663 | Runtime::Function code; |
60963afd | 3664 | if (e->integer_type()->is_byte()) |
736a16ba | 3665 | code = Runtime::STRINGTOSLICEBYTE; |
e440a328 | 3666 | else |
3667 | { | |
60963afd | 3668 | go_assert(e->integer_type()->is_rune()); |
736a16ba | 3669 | code = Runtime::STRINGTOSLICERUNE; |
e440a328 | 3670 | } |
736a16ba | 3671 | Expression* s2a = Runtime::make_call(code, loc, 2, |
3672 | Expression::make_nil(loc), | |
3673 | this->expr_); | |
ea664253 | 3674 | return Expression::make_unsafe_cast(type, s2a, loc)->get_backend(context); |
2c809f8f | 3675 | } |
3676 | else if (type->is_numeric_type()) | |
3677 | { | |
3678 | go_assert(Type::are_convertible(type, expr_type, NULL)); | |
859cdc93 | 3679 | Bexpression* bexpr = this->expr_->get_backend(context); |
ea664253 | 3680 | return gogo->backend()->convert_expression(btype, bexpr, loc); |
e440a328 | 3681 | } |
3682 | else if ((type->is_unsafe_pointer_type() | |
2c809f8f | 3683 | && (expr_type->points_to() != NULL |
3684 | || expr_type->integer_type())) | |
3685 | || (expr_type->is_unsafe_pointer_type() | |
3686 | && type->points_to() != NULL) | |
3687 | || (this->may_convert_function_types_ | |
3688 | && type->function_type() != NULL | |
3689 | && expr_type->function_type() != NULL)) | |
859cdc93 | 3690 | { |
3691 | Bexpression* bexpr = this->expr_->get_backend(context); | |
3692 | return gogo->backend()->convert_expression(btype, bexpr, loc); | |
3693 | } | |
e440a328 | 3694 | else |
2c809f8f | 3695 | { |
3696 | Expression* conversion = | |
3697 | Expression::convert_for_assignment(gogo, type, this->expr_, loc); | |
ea664253 | 3698 | return conversion->get_backend(context); |
2c809f8f | 3699 | } |
e440a328 | 3700 | } |
3701 | ||
5f6f5357 | 3702 | // Cost of inlining a type conversion. |
3703 | ||
3704 | int | |
3705 | Type_conversion_expression::do_inlining_cost() const | |
3706 | { | |
3707 | Type* type = this->type_; | |
3708 | Type* expr_type = this->expr_->type(); | |
3709 | if (type->interface_type() != NULL || expr_type->interface_type() != NULL) | |
3710 | return 10; | |
3711 | else if (type->is_string_type() && expr_type->integer_type() != NULL) | |
3712 | return 10; | |
3713 | else if (type->is_string_type() && expr_type->is_slice_type()) | |
3714 | return 10; | |
3715 | else if (type->is_slice_type() && expr_type->is_string_type()) | |
3716 | return 10; | |
3717 | else | |
3718 | return 1; | |
3719 | } | |
3720 | ||
e440a328 | 3721 | // Output a type conversion in a constant expression. |
3722 | ||
3723 | void | |
548be246 | 3724 | Type_conversion_expression::do_export(Export_function_body* efb) const |
e440a328 | 3725 | { |
204d4af4 | 3726 | efb->write_c_string("$convert("); |
548be246 | 3727 | efb->write_type(this->type_); |
3728 | efb->write_c_string(", "); | |
69f634cc | 3729 | |
3730 | Type* old_context = efb->type_context(); | |
3731 | efb->set_type_context(this->type_); | |
3732 | ||
548be246 | 3733 | this->expr_->export_expression(efb); |
69f634cc | 3734 | |
3735 | efb->set_type_context(old_context); | |
3736 | ||
548be246 | 3737 | efb->write_c_string(")"); |
e440a328 | 3738 | } |
3739 | ||
3740 | // Import a type conversion or a struct construction. | |
3741 | ||
3742 | Expression* | |
bc8e2ef4 | 3743 | Type_conversion_expression::do_import(Import_expression* imp, Location loc) |
e440a328 | 3744 | { |
204d4af4 | 3745 | imp->require_c_string("$convert("); |
e440a328 | 3746 | Type* type = imp->read_type(); |
3747 | imp->require_c_string(", "); | |
9b92780c | 3748 | Expression* val = Expression::import_expression(imp, loc); |
e440a328 | 3749 | imp->require_c_string(")"); |
9b92780c | 3750 | return Expression::make_cast(type, val, loc); |
e440a328 | 3751 | } |
3752 | ||
d751bb78 | 3753 | // Dump ast representation for a type conversion expression. |
3754 | ||
3755 | void | |
3756 | Type_conversion_expression::do_dump_expression( | |
3757 | Ast_dump_context* ast_dump_context) const | |
3758 | { | |
3759 | ast_dump_context->dump_type(this->type_); | |
3760 | ast_dump_context->ostream() << "("; | |
3761 | ast_dump_context->dump_expression(this->expr_); | |
3762 | ast_dump_context->ostream() << ") "; | |
3763 | } | |
3764 | ||
e440a328 | 3765 | // Make a type cast expression. |
3766 | ||
3767 | Expression* | |
b13c66cd | 3768 | Expression::make_cast(Type* type, Expression* val, Location location) |
e440a328 | 3769 | { |
3770 | if (type->is_error_type() || val->is_error_expression()) | |
3771 | return Expression::make_error(location); | |
3772 | return new Type_conversion_expression(type, val, location); | |
3773 | } | |
3774 | ||
98f62f7a | 3775 | // Class Unsafe_type_conversion_expression. |
9581e91d | 3776 | |
3777 | // Traversal. | |
3778 | ||
3779 | int | |
3780 | Unsafe_type_conversion_expression::do_traverse(Traverse* traverse) | |
3781 | { | |
3782 | if (Expression::traverse(&this->expr_, traverse) == TRAVERSE_EXIT | |
3783 | || Type::traverse(this->type_, traverse) == TRAVERSE_EXIT) | |
3784 | return TRAVERSE_EXIT; | |
3785 | return TRAVERSE_CONTINUE; | |
3786 | } | |
3787 | ||
3ae06f68 | 3788 | // Return whether an unsafe type conversion can be used as a constant |
3789 | // initializer. | |
aa5ae575 | 3790 | |
3791 | bool | |
3ae06f68 | 3792 | Unsafe_type_conversion_expression::do_is_static_initializer() const |
aa5ae575 | 3793 | { |
3794 | Type* type = this->type_; | |
3795 | Type* expr_type = this->expr_->type(); | |
3796 | ||
3797 | if (type->interface_type() != NULL | |
3798 | || expr_type->interface_type() != NULL) | |
3799 | return false; | |
3800 | ||
3ae06f68 | 3801 | if (!this->expr_->is_static_initializer()) |
aa5ae575 | 3802 | return false; |
3803 | ||
3804 | if (Type::are_convertible(type, expr_type, NULL)) | |
3805 | return true; | |
3806 | ||
03118c21 | 3807 | if (type->is_string_type() && expr_type->is_string_type()) |
3808 | return true; | |
3809 | ||
3810 | if ((type->is_numeric_type() | |
3811 | || type->is_boolean_type() | |
3812 | || type->points_to() != NULL) | |
3813 | && (expr_type->is_numeric_type() | |
3814 | || expr_type->is_boolean_type() | |
3815 | || expr_type->points_to() != NULL)) | |
3816 | return true; | |
3817 | ||
3818 | return false; | |
aa5ae575 | 3819 | } |
3820 | ||
de590a61 | 3821 | // Copy. |
3822 | ||
3823 | Expression* | |
3824 | Unsafe_type_conversion_expression::do_copy() | |
3825 | { | |
3826 | return new Unsafe_type_conversion_expression(this->type_->copy_expressions(), | |
3827 | this->expr_->copy(), | |
3828 | this->location()); | |
3829 | } | |
3830 | ||
9581e91d | 3831 | // Convert to backend representation. |
3832 | ||
ea664253 | 3833 | Bexpression* |
3834 | Unsafe_type_conversion_expression::do_get_backend(Translate_context* context) | |
9581e91d | 3835 | { |
3836 | // We are only called for a limited number of cases. | |
3837 | ||
3838 | Type* t = this->type_; | |
3839 | Type* et = this->expr_->type(); | |
5c4802f1 | 3840 | |
3841 | if (t->is_error_type() | |
3842 | || this->expr_->is_error_expression() | |
3843 | || et->is_error_type()) | |
3844 | { | |
3845 | go_assert(saw_errors()); | |
3846 | return context->backend()->error_expression(); | |
3847 | } | |
3848 | ||
2c809f8f | 3849 | if (t->array_type() != NULL) |
3850 | go_assert(et->array_type() != NULL | |
3851 | && t->is_slice_type() == et->is_slice_type()); | |
3852 | else if (t->struct_type() != NULL) | |
9581e91d | 3853 | { |
2c809f8f | 3854 | if (t->named_type() != NULL |
3855 | && et->named_type() != NULL | |
3856 | && !Type::are_convertible(t, et, NULL)) | |
3857 | { | |
3858 | go_assert(saw_errors()); | |
ea664253 | 3859 | return context->backend()->error_expression(); |
2c809f8f | 3860 | } |
3861 | ||
3862 | go_assert(et->struct_type() != NULL | |
3863 | && Type::are_convertible(t, et, NULL)); | |
3864 | } | |
3865 | else if (t->map_type() != NULL) | |
c484d925 | 3866 | go_assert(et->map_type() != NULL); |
9581e91d | 3867 | else if (t->channel_type() != NULL) |
c484d925 | 3868 | go_assert(et->channel_type() != NULL); |
09ea332d | 3869 | else if (t->points_to() != NULL) |
2c809f8f | 3870 | go_assert(et->points_to() != NULL |
3871 | || et->channel_type() != NULL | |
3872 | || et->map_type() != NULL | |
3873 | || et->function_type() != NULL | |
132ed071 | 3874 | || et->integer_type() != NULL |
2c809f8f | 3875 | || et->is_nil_type()); |
9581e91d | 3876 | else if (et->is_unsafe_pointer_type()) |
81487fff | 3877 | go_assert(t->points_to() != NULL |
3878 | || (t->integer_type() != NULL | |
3879 | && t->integer_type() == Type::lookup_integer_type("uintptr")->real_type())); | |
2c809f8f | 3880 | else if (t->interface_type() != NULL) |
9581e91d | 3881 | { |
2c809f8f | 3882 | bool empty_iface = t->interface_type()->is_empty(); |
c484d925 | 3883 | go_assert(et->interface_type() != NULL |
2c809f8f | 3884 | && et->interface_type()->is_empty() == empty_iface); |
9581e91d | 3885 | } |
588e3cf9 | 3886 | else if (t->integer_type() != NULL) |
2c809f8f | 3887 | go_assert(et->is_boolean_type() |
3888 | || et->integer_type() != NULL | |
3889 | || et->function_type() != NULL | |
3890 | || et->points_to() != NULL | |
3891 | || et->map_type() != NULL | |
8ba8cc87 | 3892 | || et->channel_type() != NULL |
3893 | || et->is_nil_type()); | |
cd39797e | 3894 | else if (t->function_type() != NULL) |
3895 | go_assert(et->points_to() != NULL); | |
9581e91d | 3896 | else |
c3e6f413 | 3897 | go_unreachable(); |
9581e91d | 3898 | |
2c809f8f | 3899 | Gogo* gogo = context->gogo(); |
3900 | Btype* btype = t->get_backend(gogo); | |
ea664253 | 3901 | Bexpression* bexpr = this->expr_->get_backend(context); |
2c809f8f | 3902 | Location loc = this->location(); |
ea664253 | 3903 | return gogo->backend()->convert_expression(btype, bexpr, loc); |
9581e91d | 3904 | } |
3905 | ||
d751bb78 | 3906 | // Dump ast representation for an unsafe type conversion expression. |
3907 | ||
3908 | void | |
3909 | Unsafe_type_conversion_expression::do_dump_expression( | |
3910 | Ast_dump_context* ast_dump_context) const | |
3911 | { | |
3912 | ast_dump_context->dump_type(this->type_); | |
3913 | ast_dump_context->ostream() << "("; | |
3914 | ast_dump_context->dump_expression(this->expr_); | |
3915 | ast_dump_context->ostream() << ") "; | |
3916 | } | |
3917 | ||
9581e91d | 3918 | // Make an unsafe type conversion expression. |
3919 | ||
3920 | Expression* | |
3921 | Expression::make_unsafe_cast(Type* type, Expression* expr, | |
b13c66cd | 3922 | Location location) |
9581e91d | 3923 | { |
3924 | return new Unsafe_type_conversion_expression(type, expr, location); | |
3925 | } | |
3926 | ||
76f85fd6 | 3927 | // Class Unary_expression. |
e440a328 | 3928 | |
03118c21 | 3929 | // Call the address_taken method of the operand if needed. This is |
3930 | // called after escape analysis but before inserting write barriers. | |
3931 | ||
3932 | void | |
c1177ba4 | 3933 | Unary_expression::check_operand_address_taken(Gogo*) |
03118c21 | 3934 | { |
3935 | if (this->op_ != OPERATOR_AND) | |
3936 | return; | |
3937 | ||
3938 | // If this->escapes_ is false at this point, then it was set to | |
3939 | // false by an explicit call to set_does_not_escape, and the value | |
3940 | // does not escape. If this->escapes_ is true, we may be able to | |
2f86af0a | 3941 | // set it to false based on the escape analysis pass. |
3942 | if (this->escapes_) | |
3943 | { | |
3944 | Node* n = Node::make_node(this); | |
3945 | if ((n->encoding() & ESCAPE_MASK) == int(Node::ESCAPE_NONE)) | |
3946 | this->escapes_ = false; | |
03118c21 | 3947 | } |
3948 | ||
3949 | this->expr_->address_taken(this->escapes_); | |
3950 | } | |
3951 | ||
e440a328 | 3952 | // If we are taking the address of a composite literal, and the |
2c809f8f | 3953 | // contents are not constant, then we want to make a heap expression |
e440a328 | 3954 | // instead. |
3955 | ||
3956 | Expression* | |
ceeb4318 | 3957 | Unary_expression::do_lower(Gogo*, Named_object*, Statement_inserter*, int) |
e440a328 | 3958 | { |
b13c66cd | 3959 | Location loc = this->location(); |
e440a328 | 3960 | Operator op = this->op_; |
3961 | Expression* expr = this->expr_; | |
3962 | ||
3963 | if (op == OPERATOR_MULT && expr->is_type_expression()) | |
3964 | return Expression::make_type(Type::make_pointer_type(expr->type()), loc); | |
3965 | ||
3966 | // *&x simplifies to x. *(*T)(unsafe.Pointer)(&x) does not require | |
3967 | // moving x to the heap. FIXME: Is it worth doing a real escape | |
3968 | // analysis here? This case is found in math/unsafe.go and is | |
3969 | // therefore worth special casing. | |
3970 | if (op == OPERATOR_MULT) | |
3971 | { | |
3972 | Expression* e = expr; | |
3973 | while (e->classification() == EXPRESSION_CONVERSION) | |
3974 | { | |
3975 | Type_conversion_expression* te | |
3976 | = static_cast<Type_conversion_expression*>(e); | |
3977 | e = te->expr(); | |
3978 | } | |
3979 | ||
3980 | if (e->classification() == EXPRESSION_UNARY) | |
3981 | { | |
3982 | Unary_expression* ue = static_cast<Unary_expression*>(e); | |
3983 | if (ue->op_ == OPERATOR_AND) | |
3984 | { | |
3985 | if (e == expr) | |
3986 | { | |
3987 | // *&x == x. | |
f4dea966 | 3988 | if (!ue->expr_->is_addressable() && !ue->create_temp_) |
3989 | { | |
631d5788 | 3990 | go_error_at(ue->location(), |
3991 | "invalid operand for unary %<&%>"); | |
f4dea966 | 3992 | this->set_is_error(); |
3993 | } | |
e440a328 | 3994 | return ue->expr_; |
3995 | } | |
3996 | ue->set_does_not_escape(); | |
3997 | } | |
3998 | } | |
3999 | } | |
4000 | ||
55661ce9 | 4001 | // Catching an invalid indirection of unsafe.Pointer here avoid |
4002 | // having to deal with TYPE_VOID in other places. | |
4003 | if (op == OPERATOR_MULT && expr->type()->is_unsafe_pointer_type()) | |
4004 | { | |
631d5788 | 4005 | go_error_at(this->location(), "invalid indirect of %<unsafe.Pointer%>"); |
55661ce9 | 4006 | return Expression::make_error(this->location()); |
4007 | } | |
4008 | ||
d9f3743a | 4009 | // Check for an invalid pointer dereference. We need to do this |
4010 | // here because Unary_expression::do_type will return an error type | |
4011 | // in this case. That can cause code to appear erroneous, and | |
4012 | // therefore disappear at lowering time, without any error message. | |
4013 | if (op == OPERATOR_MULT && expr->type()->points_to() == NULL) | |
4014 | { | |
4015 | this->report_error(_("expected pointer")); | |
4016 | return Expression::make_error(this->location()); | |
4017 | } | |
4018 | ||
59a401fe | 4019 | if (op == OPERATOR_PLUS || op == OPERATOR_MINUS || op == OPERATOR_XOR) |
e440a328 | 4020 | { |
0c77715b | 4021 | Numeric_constant nc; |
4022 | if (expr->numeric_constant_value(&nc)) | |
e440a328 | 4023 | { |
0c77715b | 4024 | Numeric_constant result; |
af7a5274 | 4025 | bool issued_error; |
4026 | if (Unary_expression::eval_constant(op, &nc, loc, &result, | |
4027 | &issued_error)) | |
0c77715b | 4028 | return result.expression(loc); |
af7a5274 | 4029 | else if (issued_error) |
4030 | return Expression::make_error(this->location()); | |
e440a328 | 4031 | } |
4032 | } | |
4033 | ||
4034 | return this; | |
4035 | } | |
4036 | ||
f9ca30f9 | 4037 | // Flatten expression if a nil check must be performed and create temporary |
4038 | // variables if necessary. | |
4039 | ||
4040 | Expression* | |
4041 | Unary_expression::do_flatten(Gogo* gogo, Named_object*, | |
4042 | Statement_inserter* inserter) | |
4043 | { | |
5bf8be8b | 4044 | if (this->is_error_expression() |
4045 | || this->expr_->is_error_expression() | |
4046 | || this->expr_->type()->is_error_type()) | |
4047 | { | |
4048 | go_assert(saw_errors()); | |
4049 | return Expression::make_error(this->location()); | |
4050 | } | |
f4dea966 | 4051 | |
f9ca30f9 | 4052 | Location location = this->location(); |
4053 | if (this->op_ == OPERATOR_MULT | |
4054 | && !this->expr_->is_variable()) | |
4055 | { | |
4056 | go_assert(this->expr_->type()->points_to() != NULL); | |
f614ea8b | 4057 | switch (this->requires_nil_check(gogo)) |
f9ca30f9 | 4058 | { |
f614ea8b | 4059 | case NIL_CHECK_ERROR_ENCOUNTERED: |
2a305b85 | 4060 | { |
4061 | go_assert(saw_errors()); | |
4062 | return Expression::make_error(this->location()); | |
4063 | } | |
f614ea8b | 4064 | case NIL_CHECK_NOT_NEEDED: |
4065 | break; | |
4066 | case NIL_CHECK_NEEDED: | |
4067 | this->create_temp_ = true; | |
4068 | break; | |
4069 | case NIL_CHECK_DEFAULT: | |
4070 | go_unreachable(); | |
f9ca30f9 | 4071 | } |
4072 | } | |
4073 | ||
4074 | if (this->create_temp_ && !this->expr_->is_variable()) | |
4075 | { | |
4076 | Temporary_statement* temp = | |
4077 | Statement::make_temporary(NULL, this->expr_, location); | |
4078 | inserter->insert(temp); | |
4079 | this->expr_ = Expression::make_temporary_reference(temp, location); | |
4080 | } | |
4081 | ||
4082 | return this; | |
4083 | } | |
4084 | ||
e440a328 | 4085 | // Return whether a unary expression is a constant. |
4086 | ||
4087 | bool | |
4088 | Unary_expression::do_is_constant() const | |
4089 | { | |
4090 | if (this->op_ == OPERATOR_MULT) | |
4091 | { | |
4092 | // Indirecting through a pointer is only constant if the object | |
4093 | // to which the expression points is constant, but we currently | |
4094 | // have no way to determine that. | |
4095 | return false; | |
4096 | } | |
4097 | else if (this->op_ == OPERATOR_AND) | |
4098 | { | |
4099 | // Taking the address of a variable is constant if it is a | |
f9ca30f9 | 4100 | // global variable, not constant otherwise. In other cases taking the |
4101 | // address is probably not a constant. | |
e440a328 | 4102 | Var_expression* ve = this->expr_->var_expression(); |
4103 | if (ve != NULL) | |
4104 | { | |
4105 | Named_object* no = ve->named_object(); | |
4106 | return no->is_variable() && no->var_value()->is_global(); | |
4107 | } | |
4108 | return false; | |
4109 | } | |
4110 | else | |
4111 | return this->expr_->is_constant(); | |
4112 | } | |
4113 | ||
3ae06f68 | 4114 | // Return whether a unary expression can be used as a constant |
4115 | // initializer. | |
4116 | ||
4117 | bool | |
4118 | Unary_expression::do_is_static_initializer() const | |
4119 | { | |
4120 | if (this->op_ == OPERATOR_MULT) | |
4121 | return false; | |
4122 | else if (this->op_ == OPERATOR_AND) | |
de048538 | 4123 | return Unary_expression::base_is_static_initializer(this->expr_); |
4124 | else | |
4125 | return this->expr_->is_static_initializer(); | |
4126 | } | |
3ae06f68 | 4127 | |
de048538 | 4128 | // Return whether the address of EXPR can be used as a static |
4129 | // initializer. | |
3ae06f68 | 4130 | |
de048538 | 4131 | bool |
4132 | Unary_expression::base_is_static_initializer(Expression* expr) | |
4133 | { | |
4134 | // The address of a field reference can be a static initializer if | |
4135 | // the base can be a static initializer. | |
4136 | Field_reference_expression* fre = expr->field_reference_expression(); | |
4137 | if (fre != NULL) | |
4138 | return Unary_expression::base_is_static_initializer(fre->expr()); | |
4139 | ||
4140 | // The address of an index expression can be a static initializer if | |
4141 | // the base can be a static initializer and the index is constant. | |
4142 | Array_index_expression* aind = expr->array_index_expression(); | |
4143 | if (aind != NULL) | |
4144 | return (aind->end() == NULL | |
4145 | && aind->start()->is_constant() | |
4146 | && Unary_expression::base_is_static_initializer(aind->array())); | |
4147 | ||
4148 | // The address of a global variable can be a static initializer. | |
4149 | Var_expression* ve = expr->var_expression(); | |
4150 | if (ve != NULL) | |
4151 | { | |
4152 | Named_object* no = ve->named_object(); | |
4153 | return no->is_variable() && no->var_value()->is_global(); | |
4154 | } | |
4155 | ||
4156 | // The address of a composite literal can be used as a static | |
4157 | // initializer if the composite literal is itself usable as a | |
4158 | // static initializer. | |
4159 | if (expr->is_composite_literal() && expr->is_static_initializer()) | |
4160 | return true; | |
3ae06f68 | 4161 | |
de048538 | 4162 | // The address of a string constant can be used as a static |
4163 | // initializer. This can not be written in Go itself but this is | |
4164 | // used when building a type descriptor. | |
4165 | if (expr->string_expression() != NULL) | |
4166 | return true; | |
4167 | ||
4168 | return false; | |
3ae06f68 | 4169 | } |
4170 | ||
f614ea8b | 4171 | // Return whether this dereference expression requires an explicit nil |
4172 | // check. If we are dereferencing the pointer to a large struct | |
4173 | // (greater than the specified size threshold), we need to check for | |
4174 | // nil. We don't bother to check for small structs because we expect | |
4175 | // the system to crash on a nil pointer dereference. However, if we | |
4176 | // know the address of this expression is being taken, we must always | |
4177 | // check for nil. | |
4178 | Unary_expression::Nil_check_classification | |
f03a9fbf | 4179 | Unary_expression::requires_nil_check(Gogo* gogo) |
f614ea8b | 4180 | { |
4181 | go_assert(this->op_ == OPERATOR_MULT); | |
4182 | go_assert(this->expr_->type()->points_to() != NULL); | |
4183 | ||
4184 | if (this->issue_nil_check_ == NIL_CHECK_NEEDED) | |
4185 | return NIL_CHECK_NEEDED; | |
4186 | else if (this->issue_nil_check_ == NIL_CHECK_NOT_NEEDED) | |
4187 | return NIL_CHECK_NOT_NEEDED; | |
4188 | ||
4189 | Type* ptype = this->expr_->type()->points_to(); | |
4190 | int64_t type_size = -1; | |
4191 | if (!ptype->is_void_type()) | |
4192 | { | |
4193 | bool ok = ptype->backend_type_size(gogo, &type_size); | |
4194 | if (!ok) | |
4195 | return NIL_CHECK_ERROR_ENCOUNTERED; | |
4196 | } | |
4197 | ||
4198 | int64_t size_cutoff = gogo->nil_check_size_threshold(); | |
4199 | if (size_cutoff == -1 || (type_size != -1 && type_size >= size_cutoff)) | |
4200 | this->issue_nil_check_ = NIL_CHECK_NEEDED; | |
4201 | else | |
4202 | this->issue_nil_check_ = NIL_CHECK_NOT_NEEDED; | |
4203 | return this->issue_nil_check_; | |
4204 | } | |
4205 | ||
0c77715b | 4206 | // Apply unary opcode OP to UNC, setting NC. Return true if this |
af7a5274 | 4207 | // could be done, false if not. On overflow, issues an error and sets |
4208 | // *ISSUED_ERROR. | |
e440a328 | 4209 | |
4210 | bool | |
0c77715b | 4211 | Unary_expression::eval_constant(Operator op, const Numeric_constant* unc, |
af7a5274 | 4212 | Location location, Numeric_constant* nc, |
4213 | bool* issued_error) | |
e440a328 | 4214 | { |
af7a5274 | 4215 | *issued_error = false; |
e440a328 | 4216 | switch (op) |
4217 | { | |
4218 | case OPERATOR_PLUS: | |
0c77715b | 4219 | *nc = *unc; |
e440a328 | 4220 | return true; |
0c77715b | 4221 | |
e440a328 | 4222 | case OPERATOR_MINUS: |
0c77715b | 4223 | if (unc->is_int() || unc->is_rune()) |
4224 | break; | |
4225 | else if (unc->is_float()) | |
4226 | { | |
4227 | mpfr_t uval; | |
4228 | unc->get_float(&uval); | |
4229 | mpfr_t val; | |
4230 | mpfr_init(val); | |
4231 | mpfr_neg(val, uval, GMP_RNDN); | |
4232 | nc->set_float(unc->type(), val); | |
4233 | mpfr_clear(uval); | |
4234 | mpfr_clear(val); | |
4235 | return true; | |
4236 | } | |
4237 | else if (unc->is_complex()) | |
4238 | { | |
fcbea5e4 | 4239 | mpc_t uval; |
4240 | unc->get_complex(&uval); | |
4241 | mpc_t val; | |
4242 | mpc_init2(val, mpc_precision); | |
4243 | mpc_neg(val, uval, MPC_RNDNN); | |
4244 | nc->set_complex(unc->type(), val); | |
4245 | mpc_clear(uval); | |
4246 | mpc_clear(val); | |
0c77715b | 4247 | return true; |
4248 | } | |
e440a328 | 4249 | else |
0c77715b | 4250 | go_unreachable(); |
e440a328 | 4251 | |
0c77715b | 4252 | case OPERATOR_XOR: |
4253 | break; | |
68448d53 | 4254 | |
59a401fe | 4255 | case OPERATOR_NOT: |
e440a328 | 4256 | case OPERATOR_AND: |
4257 | case OPERATOR_MULT: | |
4258 | return false; | |
0c77715b | 4259 | |
e440a328 | 4260 | default: |
c3e6f413 | 4261 | go_unreachable(); |
e440a328 | 4262 | } |
e440a328 | 4263 | |
0c77715b | 4264 | if (!unc->is_int() && !unc->is_rune()) |
4265 | return false; | |
4266 | ||
4267 | mpz_t uval; | |
8387e1df | 4268 | if (unc->is_rune()) |
4269 | unc->get_rune(&uval); | |
4270 | else | |
4271 | unc->get_int(&uval); | |
0c77715b | 4272 | mpz_t val; |
4273 | mpz_init(val); | |
e440a328 | 4274 | |
e440a328 | 4275 | switch (op) |
4276 | { | |
e440a328 | 4277 | case OPERATOR_MINUS: |
0c77715b | 4278 | mpz_neg(val, uval); |
4279 | break; | |
4280 | ||
e440a328 | 4281 | case OPERATOR_NOT: |
0c77715b | 4282 | mpz_set_ui(val, mpz_cmp_si(uval, 0) == 0 ? 1 : 0); |
4283 | break; | |
4284 | ||
e440a328 | 4285 | case OPERATOR_XOR: |
0c77715b | 4286 | { |
4287 | Type* utype = unc->type(); | |
4288 | if (utype->integer_type() == NULL | |
4289 | || utype->integer_type()->is_abstract()) | |
4290 | mpz_com(val, uval); | |
4291 | else | |
4292 | { | |
4293 | // The number of HOST_WIDE_INTs that it takes to represent | |
4294 | // UVAL. | |
4295 | size_t count = ((mpz_sizeinbase(uval, 2) | |
4296 | + HOST_BITS_PER_WIDE_INT | |
4297 | - 1) | |
4298 | / HOST_BITS_PER_WIDE_INT); | |
e440a328 | 4299 | |
0c77715b | 4300 | unsigned HOST_WIDE_INT* phwi = new unsigned HOST_WIDE_INT[count]; |
4301 | memset(phwi, 0, count * sizeof(HOST_WIDE_INT)); | |
4302 | ||
4303 | size_t obits = utype->integer_type()->bits(); | |
4304 | ||
4305 | if (!utype->integer_type()->is_unsigned() && mpz_sgn(uval) < 0) | |
4306 | { | |
4307 | mpz_t adj; | |
4308 | mpz_init_set_ui(adj, 1); | |
4309 | mpz_mul_2exp(adj, adj, obits); | |
4310 | mpz_add(uval, uval, adj); | |
4311 | mpz_clear(adj); | |
4312 | } | |
4313 | ||
4314 | size_t ecount; | |
4315 | mpz_export(phwi, &ecount, -1, sizeof(HOST_WIDE_INT), 0, 0, uval); | |
4316 | go_assert(ecount <= count); | |
4317 | ||
4318 | // Trim down to the number of words required by the type. | |
4319 | size_t ocount = ((obits + HOST_BITS_PER_WIDE_INT - 1) | |
4320 | / HOST_BITS_PER_WIDE_INT); | |
4321 | go_assert(ocount <= count); | |
4322 | ||
4323 | for (size_t i = 0; i < ocount; ++i) | |
4324 | phwi[i] = ~phwi[i]; | |
4325 | ||
4326 | size_t clearbits = ocount * HOST_BITS_PER_WIDE_INT - obits; | |
4327 | if (clearbits != 0) | |
4328 | phwi[ocount - 1] &= (((unsigned HOST_WIDE_INT) (HOST_WIDE_INT) -1) | |
4329 | >> clearbits); | |
4330 | ||
4331 | mpz_import(val, ocount, -1, sizeof(HOST_WIDE_INT), 0, 0, phwi); | |
4332 | ||
4333 | if (!utype->integer_type()->is_unsigned() | |
4334 | && mpz_tstbit(val, obits - 1)) | |
4335 | { | |
4336 | mpz_t adj; | |
4337 | mpz_init_set_ui(adj, 1); | |
4338 | mpz_mul_2exp(adj, adj, obits); | |
4339 | mpz_sub(val, val, adj); | |
4340 | mpz_clear(adj); | |
4341 | } | |
4342 | ||
4343 | delete[] phwi; | |
4344 | } | |
4345 | } | |
4346 | break; | |
e440a328 | 4347 | |
e440a328 | 4348 | default: |
c3e6f413 | 4349 | go_unreachable(); |
e440a328 | 4350 | } |
e440a328 | 4351 | |
0c77715b | 4352 | if (unc->is_rune()) |
4353 | nc->set_rune(NULL, val); | |
e440a328 | 4354 | else |
0c77715b | 4355 | nc->set_int(NULL, val); |
e440a328 | 4356 | |
0c77715b | 4357 | mpz_clear(uval); |
4358 | mpz_clear(val); | |
e440a328 | 4359 | |
af7a5274 | 4360 | if (!nc->set_type(unc->type(), true, location)) |
4361 | { | |
4362 | *issued_error = true; | |
4363 | return false; | |
4364 | } | |
4365 | return true; | |
e440a328 | 4366 | } |
4367 | ||
0c77715b | 4368 | // Return the integral constant value of a unary expression, if it has one. |
e440a328 | 4369 | |
4370 | bool | |
0c77715b | 4371 | Unary_expression::do_numeric_constant_value(Numeric_constant* nc) const |
e440a328 | 4372 | { |
0c77715b | 4373 | Numeric_constant unc; |
4374 | if (!this->expr_->numeric_constant_value(&unc)) | |
4375 | return false; | |
af7a5274 | 4376 | bool issued_error; |
0c77715b | 4377 | return Unary_expression::eval_constant(this->op_, &unc, this->location(), |
af7a5274 | 4378 | nc, &issued_error); |
e440a328 | 4379 | } |
4380 | ||
4381 | // Return the type of a unary expression. | |
4382 | ||
4383 | Type* | |
4384 | Unary_expression::do_type() | |
4385 | { | |
4386 | switch (this->op_) | |
4387 | { | |
4388 | case OPERATOR_PLUS: | |
4389 | case OPERATOR_MINUS: | |
4390 | case OPERATOR_NOT: | |
4391 | case OPERATOR_XOR: | |
4392 | return this->expr_->type(); | |
4393 | ||
4394 | case OPERATOR_AND: | |
4395 | return Type::make_pointer_type(this->expr_->type()); | |
4396 | ||
4397 | case OPERATOR_MULT: | |
4398 | { | |
4399 | Type* subtype = this->expr_->type(); | |
4400 | Type* points_to = subtype->points_to(); | |
4401 | if (points_to == NULL) | |
4402 | return Type::make_error_type(); | |
4403 | return points_to; | |
4404 | } | |
4405 | ||
4406 | default: | |
c3e6f413 | 4407 | go_unreachable(); |
e440a328 | 4408 | } |
4409 | } | |
4410 | ||
4411 | // Determine abstract types for a unary expression. | |
4412 | ||
4413 | void | |
4414 | Unary_expression::do_determine_type(const Type_context* context) | |
4415 | { | |
4416 | switch (this->op_) | |
4417 | { | |
4418 | case OPERATOR_PLUS: | |
4419 | case OPERATOR_MINUS: | |
4420 | case OPERATOR_NOT: | |
4421 | case OPERATOR_XOR: | |
4422 | this->expr_->determine_type(context); | |
4423 | break; | |
4424 | ||
4425 | case OPERATOR_AND: | |
4426 | // Taking the address of something. | |
4427 | { | |
4428 | Type* subtype = (context->type == NULL | |
4429 | ? NULL | |
4430 | : context->type->points_to()); | |
4431 | Type_context subcontext(subtype, false); | |
4432 | this->expr_->determine_type(&subcontext); | |
4433 | } | |
4434 | break; | |
4435 | ||
4436 | case OPERATOR_MULT: | |
4437 | // Indirecting through a pointer. | |
4438 | { | |
4439 | Type* subtype = (context->type == NULL | |
4440 | ? NULL | |
4441 | : Type::make_pointer_type(context->type)); | |
4442 | Type_context subcontext(subtype, false); | |
4443 | this->expr_->determine_type(&subcontext); | |
4444 | } | |
4445 | break; | |
4446 | ||
4447 | default: | |
c3e6f413 | 4448 | go_unreachable(); |
e440a328 | 4449 | } |
4450 | } | |
4451 | ||
4452 | // Check types for a unary expression. | |
4453 | ||
4454 | void | |
4455 | Unary_expression::do_check_types(Gogo*) | |
4456 | { | |
9fe897ef | 4457 | Type* type = this->expr_->type(); |
5c13bd80 | 4458 | if (type->is_error()) |
9fe897ef | 4459 | { |
4460 | this->set_is_error(); | |
4461 | return; | |
4462 | } | |
4463 | ||
e440a328 | 4464 | switch (this->op_) |
4465 | { | |
4466 | case OPERATOR_PLUS: | |
4467 | case OPERATOR_MINUS: | |
9fe897ef | 4468 | if (type->integer_type() == NULL |
4469 | && type->float_type() == NULL | |
4470 | && type->complex_type() == NULL) | |
4471 | this->report_error(_("expected numeric type")); | |
e440a328 | 4472 | break; |
4473 | ||
4474 | case OPERATOR_NOT: | |
59a401fe | 4475 | if (!type->is_boolean_type()) |
4476 | this->report_error(_("expected boolean type")); | |
4477 | break; | |
4478 | ||
e440a328 | 4479 | case OPERATOR_XOR: |
b3b1474e | 4480 | if (type->integer_type() == NULL) |
4481 | this->report_error(_("expected integer")); | |
e440a328 | 4482 | break; |
4483 | ||
4484 | case OPERATOR_AND: | |
4485 | if (!this->expr_->is_addressable()) | |
09ea332d | 4486 | { |
4487 | if (!this->create_temp_) | |
f4dea966 | 4488 | { |
631d5788 | 4489 | go_error_at(this->location(), "invalid operand for unary %<&%>"); |
f4dea966 | 4490 | this->set_is_error(); |
4491 | } | |
09ea332d | 4492 | } |
e440a328 | 4493 | else |
da244e59 | 4494 | this->expr_->issue_nil_check(); |
e440a328 | 4495 | break; |
4496 | ||
4497 | case OPERATOR_MULT: | |
4498 | // Indirecting through a pointer. | |
9fe897ef | 4499 | if (type->points_to() == NULL) |
4500 | this->report_error(_("expected pointer")); | |
7661d702 | 4501 | if (type->points_to()->is_error()) |
4502 | this->set_is_error(); | |
e440a328 | 4503 | break; |
4504 | ||
4505 | default: | |
c3e6f413 | 4506 | go_unreachable(); |
e440a328 | 4507 | } |
4508 | } | |
4509 | ||
ea664253 | 4510 | // Get the backend representation for a unary expression. |
e440a328 | 4511 | |
ea664253 | 4512 | Bexpression* |
4513 | Unary_expression::do_get_backend(Translate_context* context) | |
e440a328 | 4514 | { |
1b1f2abf | 4515 | Gogo* gogo = context->gogo(); |
e9d3367e | 4516 | Location loc = this->location(); |
4517 | ||
4518 | // Taking the address of a set-and-use-temporary expression requires | |
4519 | // setting the temporary and then taking the address. | |
4520 | if (this->op_ == OPERATOR_AND) | |
4521 | { | |
4522 | Set_and_use_temporary_expression* sut = | |
4523 | this->expr_->set_and_use_temporary_expression(); | |
4524 | if (sut != NULL) | |
4525 | { | |
4526 | Temporary_statement* temp = sut->temporary(); | |
4527 | Bvariable* bvar = temp->get_backend_variable(context); | |
d4e6573e | 4528 | Bexpression* bvar_expr = |
7af8e400 | 4529 | gogo->backend()->var_expression(bvar, loc); |
ea664253 | 4530 | Bexpression* bval = sut->expression()->get_backend(context); |
f9ca30f9 | 4531 | |
0ab48656 | 4532 | Named_object* fn = context->function(); |
4533 | go_assert(fn != NULL); | |
4534 | Bfunction* bfn = | |
4535 | fn->func_value()->get_or_make_decl(gogo, fn); | |
f9ca30f9 | 4536 | Bstatement* bassign = |
0ab48656 | 4537 | gogo->backend()->assignment_statement(bfn, bvar_expr, bval, loc); |
f9ca30f9 | 4538 | Bexpression* bvar_addr = |
4539 | gogo->backend()->address_expression(bvar_expr, loc); | |
ea664253 | 4540 | return gogo->backend()->compound_expression(bassign, bvar_addr, loc); |
e9d3367e | 4541 | } |
4542 | } | |
4543 | ||
f9ca30f9 | 4544 | Bexpression* ret; |
ea664253 | 4545 | Bexpression* bexpr = this->expr_->get_backend(context); |
f9ca30f9 | 4546 | Btype* btype = this->expr_->type()->get_backend(gogo); |
e440a328 | 4547 | switch (this->op_) |
4548 | { | |
4549 | case OPERATOR_PLUS: | |
f9ca30f9 | 4550 | ret = bexpr; |
4551 | break; | |
e440a328 | 4552 | |
4553 | case OPERATOR_MINUS: | |
f9ca30f9 | 4554 | ret = gogo->backend()->unary_expression(this->op_, bexpr, loc); |
4555 | ret = gogo->backend()->convert_expression(btype, ret, loc); | |
4556 | break; | |
e440a328 | 4557 | |
4558 | case OPERATOR_NOT: | |
e440a328 | 4559 | case OPERATOR_XOR: |
f9ca30f9 | 4560 | ret = gogo->backend()->unary_expression(this->op_, bexpr, loc); |
4561 | break; | |
e440a328 | 4562 | |
4563 | case OPERATOR_AND: | |
09ea332d | 4564 | if (!this->create_temp_) |
4565 | { | |
4566 | // We should not see a non-constant constructor here; cases | |
4567 | // where we would see one should have been moved onto the | |
4568 | // heap at parse time. Taking the address of a nonconstant | |
4569 | // constructor will not do what the programmer expects. | |
f9ca30f9 | 4570 | |
4571 | go_assert(!this->expr_->is_composite_literal() | |
3ae06f68 | 4572 | || this->expr_->is_static_initializer()); |
24060bf9 | 4573 | if (this->expr_->classification() == EXPRESSION_UNARY) |
4574 | { | |
4575 | Unary_expression* ue = | |
4576 | static_cast<Unary_expression*>(this->expr_); | |
4577 | go_assert(ue->op() != OPERATOR_AND); | |
4578 | } | |
09ea332d | 4579 | } |
e440a328 | 4580 | |
f23d7786 | 4581 | if (this->is_gc_root_ || this->is_slice_init_) |
76f85fd6 | 4582 | { |
19272321 | 4583 | std::string var_name; |
f23d7786 | 4584 | bool copy_to_heap = false; |
4585 | if (this->is_gc_root_) | |
4586 | { | |
4587 | // Build a decl for a GC root variable. GC roots are mutable, so | |
4588 | // they cannot be represented as an immutable_struct in the | |
4589 | // backend. | |
19272321 | 4590 | var_name = gogo->gc_root_name(); |
f23d7786 | 4591 | } |
4592 | else | |
4593 | { | |
4594 | // Build a decl for a slice value initializer. An immutable slice | |
4595 | // value initializer may have to be copied to the heap if it | |
4596 | // contains pointers in a non-constant context. | |
19272321 | 4597 | var_name = gogo->initializer_name(); |
f23d7786 | 4598 | |
4599 | Array_type* at = this->expr_->type()->array_type(); | |
4600 | go_assert(at != NULL); | |
4601 | ||
4602 | // If we are not copying the value to the heap, we will only | |
4603 | // initialize the value once, so we can use this directly | |
4604 | // rather than copying it. In that case we can't make it | |
4605 | // read-only, because the program is permitted to change it. | |
ee200713 | 4606 | copy_to_heap = (context->function() != NULL |
4607 | || context->is_const()); | |
f23d7786 | 4608 | } |
19272321 | 4609 | std::string asm_name(go_selectively_encode_id(var_name)); |
f23d7786 | 4610 | Bvariable* implicit = |
19272321 | 4611 | gogo->backend()->implicit_variable(var_name, asm_name, |
438b4bec | 4612 | btype, true, copy_to_heap, |
4613 | false, 0); | |
19272321 | 4614 | gogo->backend()->implicit_variable_set_init(implicit, var_name, btype, |
aa5ae575 | 4615 | true, copy_to_heap, false, |
4616 | bexpr); | |
7af8e400 | 4617 | bexpr = gogo->backend()->var_expression(implicit, loc); |
1b4fb1e0 | 4618 | |
4619 | // If we are not copying a slice initializer to the heap, | |
4620 | // then it can be changed by the program, so if it can | |
4621 | // contain pointers we must register it as a GC root. | |
4622 | if (this->is_slice_init_ | |
4623 | && !copy_to_heap | |
4624 | && this->expr_->type()->has_pointer()) | |
4625 | { | |
4626 | Bexpression* root = | |
7af8e400 | 4627 | gogo->backend()->var_expression(implicit, loc); |
1b4fb1e0 | 4628 | root = gogo->backend()->address_expression(root, loc); |
4629 | Type* type = Type::make_pointer_type(this->expr_->type()); | |
4630 | gogo->add_gc_root(Expression::make_backend(root, type, loc)); | |
4631 | } | |
76f85fd6 | 4632 | } |
4633 | else if ((this->expr_->is_composite_literal() | |
3ae06f68 | 4634 | || this->expr_->string_expression() != NULL) |
4635 | && this->expr_->is_static_initializer()) | |
f9ca30f9 | 4636 | { |
19272321 | 4637 | std::string var_name(gogo->initializer_name()); |
4638 | std::string asm_name(go_selectively_encode_id(var_name)); | |
f9ca30f9 | 4639 | Bvariable* decl = |
19272321 | 4640 | gogo->backend()->immutable_struct(var_name, asm_name, |
438b4bec | 4641 | true, false, btype, loc); |
19272321 | 4642 | gogo->backend()->immutable_struct_set_init(decl, var_name, true, |
4643 | false, btype, loc, bexpr); | |
7af8e400 | 4644 | bexpr = gogo->backend()->var_expression(decl, loc); |
f9ca30f9 | 4645 | } |
09ea332d | 4646 | |
f9ca30f9 | 4647 | go_assert(!this->create_temp_ || this->expr_->is_variable()); |
4648 | ret = gogo->backend()->address_expression(bexpr, loc); | |
4649 | break; | |
e440a328 | 4650 | |
4651 | case OPERATOR_MULT: | |
4652 | { | |
f9ca30f9 | 4653 | go_assert(this->expr_->type()->points_to() != NULL); |
e440a328 | 4654 | |
f614ea8b | 4655 | bool known_valid = false; |
f9ca30f9 | 4656 | Type* ptype = this->expr_->type()->points_to(); |
4657 | Btype* pbtype = ptype->get_backend(gogo); | |
f614ea8b | 4658 | switch (this->requires_nil_check(gogo)) |
4659 | { | |
4660 | case NIL_CHECK_NOT_NEEDED: | |
4661 | break; | |
4662 | case NIL_CHECK_ERROR_ENCOUNTERED: | |
2a305b85 | 4663 | { |
4664 | go_assert(saw_errors()); | |
4665 | return gogo->backend()->error_expression(); | |
4666 | } | |
f614ea8b | 4667 | case NIL_CHECK_NEEDED: |
4668 | { | |
f9ca30f9 | 4669 | go_assert(this->expr_->is_variable()); |
2dd89704 | 4670 | |
4671 | // If we're nil-checking the result of a set-and-use-temporary | |
4672 | // expression, then pick out the target temp and use that | |
4673 | // for the final result of the conditional. | |
4674 | Bexpression* tbexpr = bexpr; | |
4675 | Bexpression* ubexpr = bexpr; | |
4676 | Set_and_use_temporary_expression* sut = | |
4677 | this->expr_->set_and_use_temporary_expression(); | |
4678 | if (sut != NULL) { | |
4679 | Temporary_statement* temp = sut->temporary(); | |
4680 | Bvariable* bvar = temp->get_backend_variable(context); | |
4681 | ubexpr = gogo->backend()->var_expression(bvar, loc); | |
4682 | } | |
ea664253 | 4683 | Bexpression* nil = |
f614ea8b | 4684 | Expression::make_nil(loc)->get_backend(context); |
f9ca30f9 | 4685 | Bexpression* compare = |
2dd89704 | 4686 | gogo->backend()->binary_expression(OPERATOR_EQEQ, tbexpr, |
f9ca30f9 | 4687 | nil, loc); |
f9ca30f9 | 4688 | Bexpression* crash = |
f614ea8b | 4689 | gogo->runtime_error(RUNTIME_ERROR_NIL_DEREFERENCE, |
4690 | loc)->get_backend(context); | |
93715b75 | 4691 | Bfunction* bfn = context->function()->func_value()->get_decl(); |
4692 | bexpr = gogo->backend()->conditional_expression(bfn, btype, | |
4693 | compare, | |
2dd89704 | 4694 | crash, ubexpr, |
f9ca30f9 | 4695 | loc); |
f614ea8b | 4696 | known_valid = true; |
4697 | break; | |
4698 | } | |
4699 | case NIL_CHECK_DEFAULT: | |
4700 | go_unreachable(); | |
4701 | } | |
4702 | ret = gogo->backend()->indirect_expression(pbtype, bexpr, | |
4703 | known_valid, loc); | |
e440a328 | 4704 | } |
f9ca30f9 | 4705 | break; |
e440a328 | 4706 | |
4707 | default: | |
c3e6f413 | 4708 | go_unreachable(); |
e440a328 | 4709 | } |
f9ca30f9 | 4710 | |
ea664253 | 4711 | return ret; |
e440a328 | 4712 | } |
4713 | ||
4714 | // Export a unary expression. | |
4715 | ||
4716 | void | |
548be246 | 4717 | Unary_expression::do_export(Export_function_body* efb) const |
e440a328 | 4718 | { |
4719 | switch (this->op_) | |
4720 | { | |
4721 | case OPERATOR_PLUS: | |
204d4af4 | 4722 | efb->write_c_string("+"); |
e440a328 | 4723 | break; |
4724 | case OPERATOR_MINUS: | |
204d4af4 | 4725 | efb->write_c_string("-"); |
e440a328 | 4726 | break; |
4727 | case OPERATOR_NOT: | |
204d4af4 | 4728 | efb->write_c_string("!"); |
e440a328 | 4729 | break; |
4730 | case OPERATOR_XOR: | |
204d4af4 | 4731 | efb->write_c_string("^"); |
e440a328 | 4732 | break; |
4733 | case OPERATOR_AND: | |
5f6f5357 | 4734 | efb->write_c_string("&"); |
4735 | break; | |
e440a328 | 4736 | case OPERATOR_MULT: |
5f6f5357 | 4737 | efb->write_c_string("*"); |
4738 | break; | |
e440a328 | 4739 | default: |
c3e6f413 | 4740 | go_unreachable(); |
e440a328 | 4741 | } |
548be246 | 4742 | this->expr_->export_expression(efb); |
e440a328 | 4743 | } |
4744 | ||
4745 | // Import a unary expression. | |
4746 | ||
4747 | Expression* | |
bc8e2ef4 | 4748 | Unary_expression::do_import(Import_expression* imp, Location loc) |
e440a328 | 4749 | { |
4750 | Operator op; | |
4751 | switch (imp->get_char()) | |
4752 | { | |
4753 | case '+': | |
4754 | op = OPERATOR_PLUS; | |
4755 | break; | |
4756 | case '-': | |
4757 | op = OPERATOR_MINUS; | |
4758 | break; | |
4759 | case '!': | |
4760 | op = OPERATOR_NOT; | |
4761 | break; | |
4762 | case '^': | |
4763 | op = OPERATOR_XOR; | |
4764 | break; | |
5f6f5357 | 4765 | case '&': |
4766 | op = OPERATOR_AND; | |
4767 | break; | |
4768 | case '*': | |
4769 | op = OPERATOR_MULT; | |
4770 | break; | |
e440a328 | 4771 | default: |
c3e6f413 | 4772 | go_unreachable(); |
e440a328 | 4773 | } |
204d4af4 | 4774 | if (imp->version() < EXPORT_FORMAT_V3) |
4775 | imp->require_c_string(" "); | |
9b92780c | 4776 | Expression* expr = Expression::import_expression(imp, loc); |
4777 | return Expression::make_unary(op, expr, loc); | |
e440a328 | 4778 | } |
4779 | ||
d751bb78 | 4780 | // Dump ast representation of an unary expression. |
4781 | ||
4782 | void | |
4783 | Unary_expression::do_dump_expression(Ast_dump_context* ast_dump_context) const | |
4784 | { | |
4785 | ast_dump_context->dump_operator(this->op_); | |
4786 | ast_dump_context->ostream() << "("; | |
4787 | ast_dump_context->dump_expression(this->expr_); | |
4788 | ast_dump_context->ostream() << ") "; | |
4789 | } | |
4790 | ||
e440a328 | 4791 | // Make a unary expression. |
4792 | ||
4793 | Expression* | |
b13c66cd | 4794 | Expression::make_unary(Operator op, Expression* expr, Location location) |
e440a328 | 4795 | { |
4796 | return new Unary_expression(op, expr, location); | |
4797 | } | |
4798 | ||
f614ea8b | 4799 | Expression* |
4800 | Expression::make_dereference(Expression* ptr, | |
4801 | Nil_check_classification docheck, | |
4802 | Location location) | |
4803 | { | |
4804 | Expression* deref = Expression::make_unary(OPERATOR_MULT, ptr, location); | |
4805 | if (docheck == NIL_CHECK_NEEDED) | |
4806 | deref->unary_expression()->set_requires_nil_check(true); | |
4807 | else if (docheck == NIL_CHECK_NOT_NEEDED) | |
4808 | deref->unary_expression()->set_requires_nil_check(false); | |
4809 | return deref; | |
4810 | } | |
4811 | ||
e440a328 | 4812 | // If this is an indirection through a pointer, return the expression |
4813 | // being pointed through. Otherwise return this. | |
4814 | ||
4815 | Expression* | |
4816 | Expression::deref() | |
4817 | { | |
4818 | if (this->classification_ == EXPRESSION_UNARY) | |
4819 | { | |
4820 | Unary_expression* ue = static_cast<Unary_expression*>(this); | |
4821 | if (ue->op() == OPERATOR_MULT) | |
4822 | return ue->operand(); | |
4823 | } | |
4824 | return this; | |
4825 | } | |
4826 | ||
4827 | // Class Binary_expression. | |
4828 | ||
4829 | // Traversal. | |
4830 | ||
4831 | int | |
4832 | Binary_expression::do_traverse(Traverse* traverse) | |
4833 | { | |
4834 | int t = Expression::traverse(&this->left_, traverse); | |
4835 | if (t == TRAVERSE_EXIT) | |
4836 | return TRAVERSE_EXIT; | |
4837 | return Expression::traverse(&this->right_, traverse); | |
4838 | } | |
4839 | ||
3ae06f68 | 4840 | // Return whether this expression may be used as a static initializer. |
4841 | ||
4842 | bool | |
4843 | Binary_expression::do_is_static_initializer() const | |
4844 | { | |
4845 | if (!this->left_->is_static_initializer() | |
4846 | || !this->right_->is_static_initializer()) | |
4847 | return false; | |
4848 | ||
4849 | // Addresses can be static initializers, but we can't implement | |
4850 | // arbitray binary expressions of them. | |
4851 | Unary_expression* lu = this->left_->unary_expression(); | |
4852 | Unary_expression* ru = this->right_->unary_expression(); | |
4853 | if (lu != NULL && lu->op() == OPERATOR_AND) | |
4854 | { | |
4855 | if (ru != NULL && ru->op() == OPERATOR_AND) | |
4856 | return this->op_ == OPERATOR_MINUS; | |
4857 | else | |
4858 | return this->op_ == OPERATOR_PLUS || this->op_ == OPERATOR_MINUS; | |
4859 | } | |
4860 | else if (ru != NULL && ru->op() == OPERATOR_AND) | |
4861 | return this->op_ == OPERATOR_PLUS || this->op_ == OPERATOR_MINUS; | |
4862 | ||
4863 | // Other cases should resolve in the backend. | |
4864 | return true; | |
4865 | } | |
4866 | ||
0c77715b | 4867 | // Return the type to use for a binary operation on operands of |
4868 | // LEFT_TYPE and RIGHT_TYPE. These are the types of constants and as | |
4869 | // such may be NULL or abstract. | |
4870 | ||
4871 | bool | |
4872 | Binary_expression::operation_type(Operator op, Type* left_type, | |
4873 | Type* right_type, Type** result_type) | |
4874 | { | |
4875 | if (left_type != right_type | |
4876 | && !left_type->is_abstract() | |
4877 | && !right_type->is_abstract() | |
4878 | && left_type->base() != right_type->base() | |
4879 | && op != OPERATOR_LSHIFT | |
4880 | && op != OPERATOR_RSHIFT) | |
4881 | { | |
4882 | // May be a type error--let it be diagnosed elsewhere. | |
4883 | return false; | |
4884 | } | |
4885 | ||
4886 | if (op == OPERATOR_LSHIFT || op == OPERATOR_RSHIFT) | |
4887 | { | |
4888 | if (left_type->integer_type() != NULL) | |
4889 | *result_type = left_type; | |
4890 | else | |
4891 | *result_type = Type::make_abstract_integer_type(); | |
4892 | } | |
4893 | else if (!left_type->is_abstract() && left_type->named_type() != NULL) | |
4894 | *result_type = left_type; | |
4895 | else if (!right_type->is_abstract() && right_type->named_type() != NULL) | |
4896 | *result_type = right_type; | |
4897 | else if (!left_type->is_abstract()) | |
4898 | *result_type = left_type; | |
4899 | else if (!right_type->is_abstract()) | |
4900 | *result_type = right_type; | |
4901 | else if (left_type->complex_type() != NULL) | |
4902 | *result_type = left_type; | |
4903 | else if (right_type->complex_type() != NULL) | |
4904 | *result_type = right_type; | |
4905 | else if (left_type->float_type() != NULL) | |
4906 | *result_type = left_type; | |
4907 | else if (right_type->float_type() != NULL) | |
4908 | *result_type = right_type; | |
4909 | else if (left_type->integer_type() != NULL | |
4910 | && left_type->integer_type()->is_rune()) | |
4911 | *result_type = left_type; | |
4912 | else if (right_type->integer_type() != NULL | |
4913 | && right_type->integer_type()->is_rune()) | |
4914 | *result_type = right_type; | |
4915 | else | |
4916 | *result_type = left_type; | |
4917 | ||
4918 | return true; | |
4919 | } | |
4920 | ||
4921 | // Convert an integer comparison code and an operator to a boolean | |
4922 | // value. | |
e440a328 | 4923 | |
4924 | bool | |
0c77715b | 4925 | Binary_expression::cmp_to_bool(Operator op, int cmp) |
e440a328 | 4926 | { |
e440a328 | 4927 | switch (op) |
4928 | { | |
4929 | case OPERATOR_EQEQ: | |
0c77715b | 4930 | return cmp == 0; |
4931 | break; | |
e440a328 | 4932 | case OPERATOR_NOTEQ: |
0c77715b | 4933 | return cmp != 0; |
4934 | break; | |
e440a328 | 4935 | case OPERATOR_LT: |
0c77715b | 4936 | return cmp < 0; |
4937 | break; | |
e440a328 | 4938 | case OPERATOR_LE: |
0c77715b | 4939 | return cmp <= 0; |
e440a328 | 4940 | case OPERATOR_GT: |
0c77715b | 4941 | return cmp > 0; |
e440a328 | 4942 | case OPERATOR_GE: |
0c77715b | 4943 | return cmp >= 0; |
e440a328 | 4944 | default: |
c3e6f413 | 4945 | go_unreachable(); |
e440a328 | 4946 | } |
4947 | } | |
4948 | ||
0c77715b | 4949 | // Compare constants according to OP. |
e440a328 | 4950 | |
4951 | bool | |
0c77715b | 4952 | Binary_expression::compare_constant(Operator op, Numeric_constant* left_nc, |
4953 | Numeric_constant* right_nc, | |
4954 | Location location, bool* result) | |
e440a328 | 4955 | { |
0c77715b | 4956 | Type* left_type = left_nc->type(); |
4957 | Type* right_type = right_nc->type(); | |
4958 | ||
4959 | Type* type; | |
4960 | if (!Binary_expression::operation_type(op, left_type, right_type, &type)) | |
4961 | return false; | |
4962 | ||
4963 | // When comparing an untyped operand to a typed operand, we are | |
4964 | // effectively coercing the untyped operand to the other operand's | |
4965 | // type, so make sure that is valid. | |
4966 | if (!left_nc->set_type(type, true, location) | |
4967 | || !right_nc->set_type(type, true, location)) | |
4968 | return false; | |
4969 | ||
4970 | bool ret; | |
4971 | int cmp; | |
4972 | if (type->complex_type() != NULL) | |
4973 | { | |
4974 | if (op != OPERATOR_EQEQ && op != OPERATOR_NOTEQ) | |
4975 | return false; | |
4976 | ret = Binary_expression::compare_complex(left_nc, right_nc, &cmp); | |
4977 | } | |
4978 | else if (type->float_type() != NULL) | |
4979 | ret = Binary_expression::compare_float(left_nc, right_nc, &cmp); | |
e440a328 | 4980 | else |
0c77715b | 4981 | ret = Binary_expression::compare_integer(left_nc, right_nc, &cmp); |
4982 | ||
4983 | if (ret) | |
4984 | *result = Binary_expression::cmp_to_bool(op, cmp); | |
4985 | ||
4986 | return ret; | |
4987 | } | |
4988 | ||
4989 | // Compare integer constants. | |
4990 | ||
4991 | bool | |
4992 | Binary_expression::compare_integer(const Numeric_constant* left_nc, | |
4993 | const Numeric_constant* right_nc, | |
4994 | int* cmp) | |
4995 | { | |
4996 | mpz_t left_val; | |
4997 | if (!left_nc->to_int(&left_val)) | |
4998 | return false; | |
4999 | mpz_t right_val; | |
5000 | if (!right_nc->to_int(&right_val)) | |
e440a328 | 5001 | { |
0c77715b | 5002 | mpz_clear(left_val); |
5003 | return false; | |
e440a328 | 5004 | } |
0c77715b | 5005 | |
5006 | *cmp = mpz_cmp(left_val, right_val); | |
5007 | ||
5008 | mpz_clear(left_val); | |
5009 | mpz_clear(right_val); | |
5010 | ||
5011 | return true; | |
5012 | } | |
5013 | ||
5014 | // Compare floating point constants. | |
5015 | ||
5016 | bool | |
5017 | Binary_expression::compare_float(const Numeric_constant* left_nc, | |
5018 | const Numeric_constant* right_nc, | |
5019 | int* cmp) | |
5020 | { | |
5021 | mpfr_t left_val; | |
5022 | if (!left_nc->to_float(&left_val)) | |
5023 | return false; | |
5024 | mpfr_t right_val; | |
5025 | if (!right_nc->to_float(&right_val)) | |
e440a328 | 5026 | { |
0c77715b | 5027 | mpfr_clear(left_val); |
5028 | return false; | |
5029 | } | |
5030 | ||
5031 | // We already coerced both operands to the same type. If that type | |
5032 | // is not an abstract type, we need to round the values accordingly. | |
5033 | Type* type = left_nc->type(); | |
5034 | if (!type->is_abstract() && type->float_type() != NULL) | |
5035 | { | |
5036 | int bits = type->float_type()->bits(); | |
5037 | mpfr_prec_round(left_val, bits, GMP_RNDN); | |
5038 | mpfr_prec_round(right_val, bits, GMP_RNDN); | |
e440a328 | 5039 | } |
0c77715b | 5040 | |
5041 | *cmp = mpfr_cmp(left_val, right_val); | |
5042 | ||
5043 | mpfr_clear(left_val); | |
5044 | mpfr_clear(right_val); | |
5045 | ||
5046 | return true; | |
e440a328 | 5047 | } |
5048 | ||
0c77715b | 5049 | // Compare complex constants. Complex numbers may only be compared |
5050 | // for equality. | |
e440a328 | 5051 | |
5052 | bool | |
0c77715b | 5053 | Binary_expression::compare_complex(const Numeric_constant* left_nc, |
5054 | const Numeric_constant* right_nc, | |
5055 | int* cmp) | |
e440a328 | 5056 | { |
fcbea5e4 | 5057 | mpc_t left_val; |
5058 | if (!left_nc->to_complex(&left_val)) | |
0c77715b | 5059 | return false; |
fcbea5e4 | 5060 | mpc_t right_val; |
5061 | if (!right_nc->to_complex(&right_val)) | |
e440a328 | 5062 | { |
fcbea5e4 | 5063 | mpc_clear(left_val); |
0c77715b | 5064 | return false; |
e440a328 | 5065 | } |
0c77715b | 5066 | |
5067 | // We already coerced both operands to the same type. If that type | |
5068 | // is not an abstract type, we need to round the values accordingly. | |
5069 | Type* type = left_nc->type(); | |
5070 | if (!type->is_abstract() && type->complex_type() != NULL) | |
e440a328 | 5071 | { |
0c77715b | 5072 | int bits = type->complex_type()->bits(); |
fcbea5e4 | 5073 | mpfr_prec_round(mpc_realref(left_val), bits / 2, GMP_RNDN); |
5074 | mpfr_prec_round(mpc_imagref(left_val), bits / 2, GMP_RNDN); | |
5075 | mpfr_prec_round(mpc_realref(right_val), bits / 2, GMP_RNDN); | |
5076 | mpfr_prec_round(mpc_imagref(right_val), bits / 2, GMP_RNDN); | |
e440a328 | 5077 | } |
0c77715b | 5078 | |
fcbea5e4 | 5079 | *cmp = mpc_cmp(left_val, right_val) != 0; |
0c77715b | 5080 | |
fcbea5e4 | 5081 | mpc_clear(left_val); |
5082 | mpc_clear(right_val); | |
0c77715b | 5083 | |
5084 | return true; | |
e440a328 | 5085 | } |
5086 | ||
0c77715b | 5087 | // Apply binary opcode OP to LEFT_NC and RIGHT_NC, setting NC. Return |
5088 | // true if this could be done, false if not. Issue errors at LOCATION | |
af7a5274 | 5089 | // as appropriate, and sets *ISSUED_ERROR if it did. |
e440a328 | 5090 | |
5091 | bool | |
0c77715b | 5092 | Binary_expression::eval_constant(Operator op, Numeric_constant* left_nc, |
5093 | Numeric_constant* right_nc, | |
af7a5274 | 5094 | Location location, Numeric_constant* nc, |
5095 | bool* issued_error) | |
e440a328 | 5096 | { |
af7a5274 | 5097 | *issued_error = false; |
e440a328 | 5098 | switch (op) |
5099 | { | |
5100 | case OPERATOR_OROR: | |
5101 | case OPERATOR_ANDAND: | |
5102 | case OPERATOR_EQEQ: | |
5103 | case OPERATOR_NOTEQ: | |
5104 | case OPERATOR_LT: | |
5105 | case OPERATOR_LE: | |
5106 | case OPERATOR_GT: | |
5107 | case OPERATOR_GE: | |
9767e2d3 | 5108 | // These return boolean values, not numeric. |
5109 | return false; | |
0c77715b | 5110 | default: |
5111 | break; | |
5112 | } | |
5113 | ||
5114 | Type* left_type = left_nc->type(); | |
5115 | Type* right_type = right_nc->type(); | |
5116 | ||
5117 | Type* type; | |
5118 | if (!Binary_expression::operation_type(op, left_type, right_type, &type)) | |
5119 | return false; | |
5120 | ||
5121 | bool is_shift = op == OPERATOR_LSHIFT || op == OPERATOR_RSHIFT; | |
5122 | ||
5123 | // When combining an untyped operand with a typed operand, we are | |
5124 | // effectively coercing the untyped operand to the other operand's | |
5125 | // type, so make sure that is valid. | |
5126 | if (!left_nc->set_type(type, true, location)) | |
5127 | return false; | |
5128 | if (!is_shift && !right_nc->set_type(type, true, location)) | |
5129 | return false; | |
85334a21 | 5130 | if (is_shift |
5131 | && ((left_type->integer_type() == NULL | |
5132 | && !left_type->is_abstract()) | |
5133 | || (right_type->integer_type() == NULL | |
5134 | && !right_type->is_abstract()))) | |
5135 | return false; | |
0c77715b | 5136 | |
5137 | bool r; | |
5138 | if (type->complex_type() != NULL) | |
5139 | r = Binary_expression::eval_complex(op, left_nc, right_nc, location, nc); | |
5140 | else if (type->float_type() != NULL) | |
5141 | r = Binary_expression::eval_float(op, left_nc, right_nc, location, nc); | |
5142 | else | |
5143 | r = Binary_expression::eval_integer(op, left_nc, right_nc, location, nc); | |
5144 | ||
5145 | if (r) | |
af7a5274 | 5146 | { |
5147 | r = nc->set_type(type, true, location); | |
5148 | if (!r) | |
5149 | *issued_error = true; | |
5150 | } | |
0c77715b | 5151 | |
5152 | return r; | |
5153 | } | |
5154 | ||
5155 | // Apply binary opcode OP to LEFT_NC and RIGHT_NC, setting NC, using | |
5156 | // integer operations. Return true if this could be done, false if | |
5157 | // not. | |
5158 | ||
5159 | bool | |
5160 | Binary_expression::eval_integer(Operator op, const Numeric_constant* left_nc, | |
5161 | const Numeric_constant* right_nc, | |
5162 | Location location, Numeric_constant* nc) | |
5163 | { | |
5164 | mpz_t left_val; | |
5165 | if (!left_nc->to_int(&left_val)) | |
5166 | return false; | |
5167 | mpz_t right_val; | |
5168 | if (!right_nc->to_int(&right_val)) | |
5169 | { | |
5170 | mpz_clear(left_val); | |
e440a328 | 5171 | return false; |
0c77715b | 5172 | } |
5173 | ||
5174 | mpz_t val; | |
5175 | mpz_init(val); | |
5176 | ||
5177 | switch (op) | |
5178 | { | |
e440a328 | 5179 | case OPERATOR_PLUS: |
5180 | mpz_add(val, left_val, right_val); | |
2c809f8f | 5181 | if (mpz_sizeinbase(val, 2) > 0x100000) |
5182 | { | |
631d5788 | 5183 | go_error_at(location, "constant addition overflow"); |
71a45216 | 5184 | nc->set_invalid(); |
2c809f8f | 5185 | mpz_set_ui(val, 1); |
5186 | } | |
e440a328 | 5187 | break; |
5188 | case OPERATOR_MINUS: | |
5189 | mpz_sub(val, left_val, right_val); | |
2c809f8f | 5190 | if (mpz_sizeinbase(val, 2) > 0x100000) |
5191 | { | |
631d5788 | 5192 | go_error_at(location, "constant subtraction overflow"); |
71a45216 | 5193 | nc->set_invalid(); |
2c809f8f | 5194 | mpz_set_ui(val, 1); |
5195 | } | |
e440a328 | 5196 | break; |
5197 | case OPERATOR_OR: | |
5198 | mpz_ior(val, left_val, right_val); | |
5199 | break; | |
5200 | case OPERATOR_XOR: | |
5201 | mpz_xor(val, left_val, right_val); | |
5202 | break; | |
5203 | case OPERATOR_MULT: | |
5204 | mpz_mul(val, left_val, right_val); | |
2c809f8f | 5205 | if (mpz_sizeinbase(val, 2) > 0x100000) |
5206 | { | |
631d5788 | 5207 | go_error_at(location, "constant multiplication overflow"); |
71a45216 | 5208 | nc->set_invalid(); |
2c809f8f | 5209 | mpz_set_ui(val, 1); |
5210 | } | |
e440a328 | 5211 | break; |
5212 | case OPERATOR_DIV: | |
5213 | if (mpz_sgn(right_val) != 0) | |
5214 | mpz_tdiv_q(val, left_val, right_val); | |
5215 | else | |
5216 | { | |
631d5788 | 5217 | go_error_at(location, "division by zero"); |
71a45216 | 5218 | nc->set_invalid(); |
e440a328 | 5219 | mpz_set_ui(val, 0); |
e440a328 | 5220 | } |
5221 | break; | |
5222 | case OPERATOR_MOD: | |
5223 | if (mpz_sgn(right_val) != 0) | |
5224 | mpz_tdiv_r(val, left_val, right_val); | |
5225 | else | |
5226 | { | |
631d5788 | 5227 | go_error_at(location, "division by zero"); |
71a45216 | 5228 | nc->set_invalid(); |
e440a328 | 5229 | mpz_set_ui(val, 0); |
e440a328 | 5230 | } |
5231 | break; | |
5232 | case OPERATOR_LSHIFT: | |
5233 | { | |
5234 | unsigned long shift = mpz_get_ui(right_val); | |
0c77715b | 5235 | if (mpz_cmp_ui(right_val, shift) == 0 && shift <= 0x100000) |
5236 | mpz_mul_2exp(val, left_val, shift); | |
5237 | else | |
e440a328 | 5238 | { |
631d5788 | 5239 | go_error_at(location, "shift count overflow"); |
71a45216 | 5240 | nc->set_invalid(); |
2c809f8f | 5241 | mpz_set_ui(val, 1); |
e440a328 | 5242 | } |
e440a328 | 5243 | break; |
5244 | } | |
5245 | break; | |
5246 | case OPERATOR_RSHIFT: | |
5247 | { | |
5248 | unsigned long shift = mpz_get_ui(right_val); | |
5249 | if (mpz_cmp_ui(right_val, shift) != 0) | |
5250 | { | |
631d5788 | 5251 | go_error_at(location, "shift count overflow"); |
71a45216 | 5252 | nc->set_invalid(); |
2c809f8f | 5253 | mpz_set_ui(val, 1); |
e440a328 | 5254 | } |
e440a328 | 5255 | else |
0c77715b | 5256 | { |
5257 | if (mpz_cmp_ui(left_val, 0) >= 0) | |
5258 | mpz_tdiv_q_2exp(val, left_val, shift); | |
5259 | else | |
5260 | mpz_fdiv_q_2exp(val, left_val, shift); | |
5261 | } | |
e440a328 | 5262 | break; |
5263 | } | |
5264 | break; | |
5265 | case OPERATOR_AND: | |
5266 | mpz_and(val, left_val, right_val); | |
5267 | break; | |
5268 | case OPERATOR_BITCLEAR: | |
5269 | { | |
5270 | mpz_t tval; | |
5271 | mpz_init(tval); | |
5272 | mpz_com(tval, right_val); | |
5273 | mpz_and(val, left_val, tval); | |
5274 | mpz_clear(tval); | |
5275 | } | |
5276 | break; | |
5277 | default: | |
c3e6f413 | 5278 | go_unreachable(); |
e440a328 | 5279 | } |
5280 | ||
0c77715b | 5281 | mpz_clear(left_val); |
5282 | mpz_clear(right_val); | |
e440a328 | 5283 | |
0c77715b | 5284 | if (left_nc->is_rune() |
5285 | || (op != OPERATOR_LSHIFT | |
5286 | && op != OPERATOR_RSHIFT | |
5287 | && right_nc->is_rune())) | |
5288 | nc->set_rune(NULL, val); | |
5289 | else | |
5290 | nc->set_int(NULL, val); | |
5291 | ||
5292 | mpz_clear(val); | |
e440a328 | 5293 | |
5294 | return true; | |
5295 | } | |
5296 | ||
0c77715b | 5297 | // Apply binary opcode OP to LEFT_NC and RIGHT_NC, setting NC, using |
5298 | // floating point operations. Return true if this could be done, | |
5299 | // false if not. | |
e440a328 | 5300 | |
5301 | bool | |
0c77715b | 5302 | Binary_expression::eval_float(Operator op, const Numeric_constant* left_nc, |
5303 | const Numeric_constant* right_nc, | |
5304 | Location location, Numeric_constant* nc) | |
e440a328 | 5305 | { |
0c77715b | 5306 | mpfr_t left_val; |
5307 | if (!left_nc->to_float(&left_val)) | |
5308 | return false; | |
5309 | mpfr_t right_val; | |
5310 | if (!right_nc->to_float(&right_val)) | |
e440a328 | 5311 | { |
0c77715b | 5312 | mpfr_clear(left_val); |
e440a328 | 5313 | return false; |
0c77715b | 5314 | } |
5315 | ||
5316 | mpfr_t val; | |
5317 | mpfr_init(val); | |
5318 | ||
5319 | bool ret = true; | |
5320 | switch (op) | |
5321 | { | |
e440a328 | 5322 | case OPERATOR_PLUS: |
5323 | mpfr_add(val, left_val, right_val, GMP_RNDN); | |
5324 | break; | |
5325 | case OPERATOR_MINUS: | |
5326 | mpfr_sub(val, left_val, right_val, GMP_RNDN); | |
5327 | break; | |
5328 | case OPERATOR_OR: | |
5329 | case OPERATOR_XOR: | |
5330 | case OPERATOR_AND: | |
5331 | case OPERATOR_BITCLEAR: | |
0c77715b | 5332 | case OPERATOR_MOD: |
5333 | case OPERATOR_LSHIFT: | |
5334 | case OPERATOR_RSHIFT: | |
5335 | mpfr_set_ui(val, 0, GMP_RNDN); | |
5336 | ret = false; | |
5337 | break; | |
e440a328 | 5338 | case OPERATOR_MULT: |
5339 | mpfr_mul(val, left_val, right_val, GMP_RNDN); | |
5340 | break; | |
5341 | case OPERATOR_DIV: | |
0c77715b | 5342 | if (!mpfr_zero_p(right_val)) |
5343 | mpfr_div(val, left_val, right_val, GMP_RNDN); | |
5344 | else | |
5345 | { | |
631d5788 | 5346 | go_error_at(location, "division by zero"); |
71a45216 | 5347 | nc->set_invalid(); |
0c77715b | 5348 | mpfr_set_ui(val, 0, GMP_RNDN); |
5349 | } | |
e440a328 | 5350 | break; |
e440a328 | 5351 | default: |
c3e6f413 | 5352 | go_unreachable(); |
e440a328 | 5353 | } |
5354 | ||
0c77715b | 5355 | mpfr_clear(left_val); |
5356 | mpfr_clear(right_val); | |
e440a328 | 5357 | |
0c77715b | 5358 | nc->set_float(NULL, val); |
5359 | mpfr_clear(val); | |
e440a328 | 5360 | |
0c77715b | 5361 | return ret; |
e440a328 | 5362 | } |
5363 | ||
0c77715b | 5364 | // Apply binary opcode OP to LEFT_NC and RIGHT_NC, setting NC, using |
5365 | // complex operations. Return true if this could be done, false if | |
5366 | // not. | |
e440a328 | 5367 | |
5368 | bool | |
0c77715b | 5369 | Binary_expression::eval_complex(Operator op, const Numeric_constant* left_nc, |
5370 | const Numeric_constant* right_nc, | |
5371 | Location location, Numeric_constant* nc) | |
e440a328 | 5372 | { |
fcbea5e4 | 5373 | mpc_t left_val; |
5374 | if (!left_nc->to_complex(&left_val)) | |
0c77715b | 5375 | return false; |
fcbea5e4 | 5376 | mpc_t right_val; |
5377 | if (!right_nc->to_complex(&right_val)) | |
e440a328 | 5378 | { |
fcbea5e4 | 5379 | mpc_clear(left_val); |
e440a328 | 5380 | return false; |
0c77715b | 5381 | } |
5382 | ||
fcbea5e4 | 5383 | mpc_t val; |
5384 | mpc_init2(val, mpc_precision); | |
0c77715b | 5385 | |
5386 | bool ret = true; | |
5387 | switch (op) | |
5388 | { | |
e440a328 | 5389 | case OPERATOR_PLUS: |
fcbea5e4 | 5390 | mpc_add(val, left_val, right_val, MPC_RNDNN); |
e440a328 | 5391 | break; |
5392 | case OPERATOR_MINUS: | |
fcbea5e4 | 5393 | mpc_sub(val, left_val, right_val, MPC_RNDNN); |
e440a328 | 5394 | break; |
5395 | case OPERATOR_OR: | |
5396 | case OPERATOR_XOR: | |
5397 | case OPERATOR_AND: | |
5398 | case OPERATOR_BITCLEAR: | |
0c77715b | 5399 | case OPERATOR_MOD: |
5400 | case OPERATOR_LSHIFT: | |
5401 | case OPERATOR_RSHIFT: | |
fcbea5e4 | 5402 | mpc_set_ui(val, 0, MPC_RNDNN); |
0c77715b | 5403 | ret = false; |
5404 | break; | |
e440a328 | 5405 | case OPERATOR_MULT: |
fcbea5e4 | 5406 | mpc_mul(val, left_val, right_val, MPC_RNDNN); |
e440a328 | 5407 | break; |
5408 | case OPERATOR_DIV: | |
fcbea5e4 | 5409 | if (mpc_cmp_si(right_val, 0) == 0) |
5410 | { | |
631d5788 | 5411 | go_error_at(location, "division by zero"); |
71a45216 | 5412 | nc->set_invalid(); |
fcbea5e4 | 5413 | mpc_set_ui(val, 0, MPC_RNDNN); |
5414 | break; | |
5415 | } | |
5416 | mpc_div(val, left_val, right_val, MPC_RNDNN); | |
e440a328 | 5417 | break; |
e440a328 | 5418 | default: |
c3e6f413 | 5419 | go_unreachable(); |
e440a328 | 5420 | } |
5421 | ||
fcbea5e4 | 5422 | mpc_clear(left_val); |
5423 | mpc_clear(right_val); | |
e440a328 | 5424 | |
fcbea5e4 | 5425 | nc->set_complex(NULL, val); |
5426 | mpc_clear(val); | |
e440a328 | 5427 | |
0c77715b | 5428 | return ret; |
e440a328 | 5429 | } |
5430 | ||
5431 | // Lower a binary expression. We have to evaluate constant | |
5432 | // expressions now, in order to implement Go's unlimited precision | |
5433 | // constants. | |
5434 | ||
5435 | Expression* | |
e9d3367e | 5436 | Binary_expression::do_lower(Gogo* gogo, Named_object*, |
5437 | Statement_inserter* inserter, int) | |
e440a328 | 5438 | { |
b13c66cd | 5439 | Location location = this->location(); |
e440a328 | 5440 | Operator op = this->op_; |
5441 | Expression* left = this->left_; | |
5442 | Expression* right = this->right_; | |
5443 | ||
5444 | const bool is_comparison = (op == OPERATOR_EQEQ | |
5445 | || op == OPERATOR_NOTEQ | |
5446 | || op == OPERATOR_LT | |
5447 | || op == OPERATOR_LE | |
5448 | || op == OPERATOR_GT | |
5449 | || op == OPERATOR_GE); | |
5450 | ||
0c77715b | 5451 | // Numeric constant expressions. |
e440a328 | 5452 | { |
0c77715b | 5453 | Numeric_constant left_nc; |
5454 | Numeric_constant right_nc; | |
5455 | if (left->numeric_constant_value(&left_nc) | |
5456 | && right->numeric_constant_value(&right_nc)) | |
e440a328 | 5457 | { |
0c77715b | 5458 | if (is_comparison) |
e440a328 | 5459 | { |
0c77715b | 5460 | bool result; |
5461 | if (!Binary_expression::compare_constant(op, &left_nc, | |
5462 | &right_nc, location, | |
5463 | &result)) | |
5464 | return this; | |
e90c9dfc | 5465 | return Expression::make_cast(Type::make_boolean_type(), |
0c77715b | 5466 | Expression::make_boolean(result, |
5467 | location), | |
5468 | location); | |
e440a328 | 5469 | } |
5470 | else | |
5471 | { | |
0c77715b | 5472 | Numeric_constant nc; |
af7a5274 | 5473 | bool issued_error; |
0c77715b | 5474 | if (!Binary_expression::eval_constant(op, &left_nc, &right_nc, |
af7a5274 | 5475 | location, &nc, |
5476 | &issued_error)) | |
5477 | { | |
5478 | if (issued_error) | |
5479 | return Expression::make_error(location); | |
71a45216 | 5480 | return this; |
af7a5274 | 5481 | } |
0c77715b | 5482 | return nc.expression(location); |
e440a328 | 5483 | } |
5484 | } | |
e440a328 | 5485 | } |
5486 | ||
5487 | // String constant expressions. | |
315fa98d | 5488 | if (left->type()->is_string_type() && right->type()->is_string_type()) |
e440a328 | 5489 | { |
5490 | std::string left_string; | |
5491 | std::string right_string; | |
5492 | if (left->string_constant_value(&left_string) | |
5493 | && right->string_constant_value(&right_string)) | |
315fa98d | 5494 | { |
5495 | if (op == OPERATOR_PLUS) | |
5496 | return Expression::make_string(left_string + right_string, | |
5497 | location); | |
5498 | else if (is_comparison) | |
5499 | { | |
5500 | int cmp = left_string.compare(right_string); | |
0c77715b | 5501 | bool r = Binary_expression::cmp_to_bool(op, cmp); |
e90c9dfc | 5502 | return Expression::make_boolean(r, location); |
b40dc774 | 5503 | } |
5504 | } | |
b40dc774 | 5505 | } |
5506 | ||
ceeb12d7 | 5507 | // Lower struct, array, and some interface comparisons. |
e9d3367e | 5508 | if (op == OPERATOR_EQEQ || op == OPERATOR_NOTEQ) |
5509 | { | |
b79832ca | 5510 | if (left->type()->struct_type() != NULL |
5511 | && right->type()->struct_type() != NULL) | |
e9d3367e | 5512 | return this->lower_struct_comparison(gogo, inserter); |
5513 | else if (left->type()->array_type() != NULL | |
b79832ca | 5514 | && !left->type()->is_slice_type() |
5515 | && right->type()->array_type() != NULL | |
5516 | && !right->type()->is_slice_type()) | |
e9d3367e | 5517 | return this->lower_array_comparison(gogo, inserter); |
ceeb12d7 | 5518 | else if ((left->type()->interface_type() != NULL |
5519 | && right->type()->interface_type() == NULL) | |
5520 | || (left->type()->interface_type() == NULL | |
5521 | && right->type()->interface_type() != NULL)) | |
5522 | return this->lower_interface_value_comparison(gogo, inserter); | |
e9d3367e | 5523 | } |
5524 | ||
736a16ba | 5525 | // Lower string concatenation to String_concat_expression, so that |
5526 | // we can group sequences of string additions. | |
5527 | if (this->left_->type()->is_string_type() && this->op_ == OPERATOR_PLUS) | |
5528 | { | |
5529 | Expression_list* exprs; | |
5530 | String_concat_expression* left_sce = | |
5531 | this->left_->string_concat_expression(); | |
5532 | if (left_sce != NULL) | |
5533 | exprs = left_sce->exprs(); | |
5534 | else | |
5535 | { | |
5536 | exprs = new Expression_list(); | |
5537 | exprs->push_back(this->left_); | |
5538 | } | |
5539 | ||
5540 | String_concat_expression* right_sce = | |
5541 | this->right_->string_concat_expression(); | |
5542 | if (right_sce != NULL) | |
5543 | exprs->append(right_sce->exprs()); | |
5544 | else | |
5545 | exprs->push_back(this->right_); | |
5546 | ||
5547 | return Expression::make_string_concat(exprs); | |
5548 | } | |
5549 | ||
e440a328 | 5550 | return this; |
5551 | } | |
5552 | ||
e9d3367e | 5553 | // Lower a struct comparison. |
5554 | ||
5555 | Expression* | |
5556 | Binary_expression::lower_struct_comparison(Gogo* gogo, | |
5557 | Statement_inserter* inserter) | |
5558 | { | |
5559 | Struct_type* st = this->left_->type()->struct_type(); | |
5560 | Struct_type* st2 = this->right_->type()->struct_type(); | |
5561 | if (st2 == NULL) | |
5562 | return this; | |
3a522dcc | 5563 | if (st != st2 |
5564 | && !Type::are_identical(st, st2, | |
5565 | Type::COMPARE_ERRORS | Type::COMPARE_TAGS, | |
5566 | NULL)) | |
e9d3367e | 5567 | return this; |
5568 | if (!Type::are_compatible_for_comparison(true, this->left_->type(), | |
5569 | this->right_->type(), NULL)) | |
5570 | return this; | |
5571 | ||
5572 | // See if we can compare using memcmp. As a heuristic, we use | |
5573 | // memcmp rather than field references and comparisons if there are | |
5574 | // more than two fields. | |
113ef6a5 | 5575 | if (st->compare_is_identity(gogo) && st->total_field_count() > 2) |
e9d3367e | 5576 | return this->lower_compare_to_memcmp(gogo, inserter); |
5577 | ||
5578 | Location loc = this->location(); | |
5579 | ||
5580 | Expression* left = this->left_; | |
5581 | Temporary_statement* left_temp = NULL; | |
5582 | if (left->var_expression() == NULL | |
5583 | && left->temporary_reference_expression() == NULL) | |
5584 | { | |
5585 | left_temp = Statement::make_temporary(left->type(), NULL, loc); | |
5586 | inserter->insert(left_temp); | |
5587 | left = Expression::make_set_and_use_temporary(left_temp, left, loc); | |
5588 | } | |
5589 | ||
5590 | Expression* right = this->right_; | |
5591 | Temporary_statement* right_temp = NULL; | |
5592 | if (right->var_expression() == NULL | |
5593 | && right->temporary_reference_expression() == NULL) | |
5594 | { | |
5595 | right_temp = Statement::make_temporary(right->type(), NULL, loc); | |
5596 | inserter->insert(right_temp); | |
5597 | right = Expression::make_set_and_use_temporary(right_temp, right, loc); | |
5598 | } | |
5599 | ||
5600 | Expression* ret = Expression::make_boolean(true, loc); | |
5601 | const Struct_field_list* fields = st->fields(); | |
5602 | unsigned int field_index = 0; | |
5603 | for (Struct_field_list::const_iterator pf = fields->begin(); | |
5604 | pf != fields->end(); | |
5605 | ++pf, ++field_index) | |
5606 | { | |
f5165c05 | 5607 | if (Gogo::is_sink_name(pf->field_name())) |
5608 | continue; | |
5609 | ||
e9d3367e | 5610 | if (field_index > 0) |
5611 | { | |
5612 | if (left_temp == NULL) | |
5613 | left = left->copy(); | |
5614 | else | |
5615 | left = Expression::make_temporary_reference(left_temp, loc); | |
5616 | if (right_temp == NULL) | |
5617 | right = right->copy(); | |
5618 | else | |
5619 | right = Expression::make_temporary_reference(right_temp, loc); | |
5620 | } | |
5621 | Expression* f1 = Expression::make_field_reference(left, field_index, | |
5622 | loc); | |
5623 | Expression* f2 = Expression::make_field_reference(right, field_index, | |
5624 | loc); | |
5625 | Expression* cond = Expression::make_binary(OPERATOR_EQEQ, f1, f2, loc); | |
5626 | ret = Expression::make_binary(OPERATOR_ANDAND, ret, cond, loc); | |
5627 | } | |
5628 | ||
5629 | if (this->op_ == OPERATOR_NOTEQ) | |
5630 | ret = Expression::make_unary(OPERATOR_NOT, ret, loc); | |
5631 | ||
5632 | return ret; | |
5633 | } | |
5634 | ||
5635 | // Lower an array comparison. | |
5636 | ||
5637 | Expression* | |
5638 | Binary_expression::lower_array_comparison(Gogo* gogo, | |
5639 | Statement_inserter* inserter) | |
5640 | { | |
5641 | Array_type* at = this->left_->type()->array_type(); | |
5642 | Array_type* at2 = this->right_->type()->array_type(); | |
5643 | if (at2 == NULL) | |
5644 | return this; | |
3a522dcc | 5645 | if (at != at2 |
5646 | && !Type::are_identical(at, at2, | |
5647 | Type::COMPARE_ERRORS | Type::COMPARE_TAGS, | |
5648 | NULL)) | |
e9d3367e | 5649 | return this; |
5650 | if (!Type::are_compatible_for_comparison(true, this->left_->type(), | |
5651 | this->right_->type(), NULL)) | |
5652 | return this; | |
5653 | ||
5654 | // Call memcmp directly if possible. This may let the middle-end | |
5655 | // optimize the call. | |
113ef6a5 | 5656 | if (at->compare_is_identity(gogo)) |
e9d3367e | 5657 | return this->lower_compare_to_memcmp(gogo, inserter); |
5658 | ||
5659 | // Call the array comparison function. | |
5660 | Named_object* hash_fn; | |
5661 | Named_object* equal_fn; | |
5662 | at->type_functions(gogo, this->left_->type()->named_type(), NULL, NULL, | |
5663 | &hash_fn, &equal_fn); | |
5664 | ||
5665 | Location loc = this->location(); | |
5666 | ||
5667 | Expression* func = Expression::make_func_reference(equal_fn, NULL, loc); | |
5668 | ||
5669 | Expression_list* args = new Expression_list(); | |
5670 | args->push_back(this->operand_address(inserter, this->left_)); | |
5671 | args->push_back(this->operand_address(inserter, this->right_)); | |
e9d3367e | 5672 | |
5673 | Expression* ret = Expression::make_call(func, args, false, loc); | |
5674 | ||
5675 | if (this->op_ == OPERATOR_NOTEQ) | |
5676 | ret = Expression::make_unary(OPERATOR_NOT, ret, loc); | |
5677 | ||
5678 | return ret; | |
5679 | } | |
5680 | ||
ceeb12d7 | 5681 | // Lower an interface to value comparison. |
5682 | ||
5683 | Expression* | |
5684 | Binary_expression::lower_interface_value_comparison(Gogo*, | |
5685 | Statement_inserter* inserter) | |
5686 | { | |
5687 | Type* left_type = this->left_->type(); | |
5688 | Type* right_type = this->right_->type(); | |
5689 | Interface_type* ift; | |
5690 | if (left_type->interface_type() != NULL) | |
5691 | { | |
5692 | ift = left_type->interface_type(); | |
5693 | if (!ift->implements_interface(right_type, NULL)) | |
5694 | return this; | |
5695 | } | |
5696 | else | |
5697 | { | |
5698 | ift = right_type->interface_type(); | |
5699 | if (!ift->implements_interface(left_type, NULL)) | |
5700 | return this; | |
5701 | } | |
5702 | if (!Type::are_compatible_for_comparison(true, left_type, right_type, NULL)) | |
5703 | return this; | |
5704 | ||
5705 | Location loc = this->location(); | |
5706 | ||
5707 | if (left_type->interface_type() == NULL | |
5708 | && left_type->points_to() == NULL | |
5709 | && !this->left_->is_addressable()) | |
5710 | { | |
5711 | Temporary_statement* temp = | |
5712 | Statement::make_temporary(left_type, NULL, loc); | |
5713 | inserter->insert(temp); | |
5714 | this->left_ = | |
5715 | Expression::make_set_and_use_temporary(temp, this->left_, loc); | |
5716 | } | |
5717 | ||
5718 | if (right_type->interface_type() == NULL | |
5719 | && right_type->points_to() == NULL | |
5720 | && !this->right_->is_addressable()) | |
5721 | { | |
5722 | Temporary_statement* temp = | |
5723 | Statement::make_temporary(right_type, NULL, loc); | |
5724 | inserter->insert(temp); | |
5725 | this->right_ = | |
5726 | Expression::make_set_and_use_temporary(temp, this->right_, loc); | |
5727 | } | |
5728 | ||
5729 | return this; | |
5730 | } | |
5731 | ||
e9d3367e | 5732 | // Lower a struct or array comparison to a call to memcmp. |
5733 | ||
5734 | Expression* | |
5735 | Binary_expression::lower_compare_to_memcmp(Gogo*, Statement_inserter* inserter) | |
5736 | { | |
5737 | Location loc = this->location(); | |
5738 | ||
5739 | Expression* a1 = this->operand_address(inserter, this->left_); | |
5740 | Expression* a2 = this->operand_address(inserter, this->right_); | |
5741 | Expression* len = Expression::make_type_info(this->left_->type(), | |
5742 | TYPE_INFO_SIZE); | |
5743 | ||
5744 | Expression* call = Runtime::make_call(Runtime::MEMCMP, loc, 3, a1, a2, len); | |
e67508fa | 5745 | Expression* zero = Expression::make_integer_ul(0, NULL, loc); |
e9d3367e | 5746 | return Expression::make_binary(this->op_, call, zero, loc); |
5747 | } | |
5748 | ||
a32698ee | 5749 | Expression* |
5c3f3470 | 5750 | Binary_expression::do_flatten(Gogo* gogo, Named_object*, |
a32698ee | 5751 | Statement_inserter* inserter) |
5752 | { | |
5753 | Location loc = this->location(); | |
5bf8be8b | 5754 | if (this->left_->type()->is_error_type() |
5755 | || this->right_->type()->is_error_type() | |
5756 | || this->left_->is_error_expression() | |
5757 | || this->right_->is_error_expression()) | |
5758 | { | |
5759 | go_assert(saw_errors()); | |
5760 | return Expression::make_error(loc); | |
5761 | } | |
5762 | ||
a32698ee | 5763 | Temporary_statement* temp; |
a32698ee | 5764 | |
5765 | Type* left_type = this->left_->type(); | |
5766 | bool is_shift_op = (this->op_ == OPERATOR_LSHIFT | |
5767 | || this->op_ == OPERATOR_RSHIFT); | |
5768 | bool is_idiv_op = ((this->op_ == OPERATOR_DIV && | |
5769 | left_type->integer_type() != NULL) | |
5770 | || this->op_ == OPERATOR_MOD); | |
5771 | ||
a32698ee | 5772 | if (is_shift_op |
5c3f3470 | 5773 | || (is_idiv_op |
5774 | && (gogo->check_divide_by_zero() || gogo->check_divide_overflow()))) | |
a32698ee | 5775 | { |
545ab43b | 5776 | if (!this->left_->is_variable() && !this->left_->is_constant()) |
a32698ee | 5777 | { |
5778 | temp = Statement::make_temporary(NULL, this->left_, loc); | |
5779 | inserter->insert(temp); | |
5780 | this->left_ = Expression::make_temporary_reference(temp, loc); | |
5781 | } | |
545ab43b | 5782 | if (!this->right_->is_variable() && !this->right_->is_constant()) |
a32698ee | 5783 | { |
5784 | temp = | |
5785 | Statement::make_temporary(NULL, this->right_, loc); | |
5786 | this->right_ = Expression::make_temporary_reference(temp, loc); | |
5787 | inserter->insert(temp); | |
5788 | } | |
5789 | } | |
5790 | return this; | |
5791 | } | |
5792 | ||
5793 | ||
e9d3367e | 5794 | // Return the address of EXPR, cast to unsafe.Pointer. |
5795 | ||
5796 | Expression* | |
5797 | Binary_expression::operand_address(Statement_inserter* inserter, | |
5798 | Expression* expr) | |
5799 | { | |
5800 | Location loc = this->location(); | |
5801 | ||
5802 | if (!expr->is_addressable()) | |
5803 | { | |
5804 | Temporary_statement* temp = Statement::make_temporary(expr->type(), NULL, | |
5805 | loc); | |
5806 | inserter->insert(temp); | |
5807 | expr = Expression::make_set_and_use_temporary(temp, expr, loc); | |
5808 | } | |
5809 | expr = Expression::make_unary(OPERATOR_AND, expr, loc); | |
5810 | static_cast<Unary_expression*>(expr)->set_does_not_escape(); | |
5811 | Type* void_type = Type::make_void_type(); | |
5812 | Type* unsafe_pointer_type = Type::make_pointer_type(void_type); | |
5813 | return Expression::make_cast(unsafe_pointer_type, expr, loc); | |
5814 | } | |
5815 | ||
0c77715b | 5816 | // Return the numeric constant value, if it has one. |
e440a328 | 5817 | |
5818 | bool | |
0c77715b | 5819 | Binary_expression::do_numeric_constant_value(Numeric_constant* nc) const |
e440a328 | 5820 | { |
0c77715b | 5821 | Numeric_constant left_nc; |
5822 | if (!this->left_->numeric_constant_value(&left_nc)) | |
5823 | return false; | |
5824 | Numeric_constant right_nc; | |
5825 | if (!this->right_->numeric_constant_value(&right_nc)) | |
5826 | return false; | |
af7a5274 | 5827 | bool issued_error; |
9767e2d3 | 5828 | return Binary_expression::eval_constant(this->op_, &left_nc, &right_nc, |
af7a5274 | 5829 | this->location(), nc, &issued_error); |
e440a328 | 5830 | } |
5831 | ||
5832 | // Note that the value is being discarded. | |
5833 | ||
4f2138d7 | 5834 | bool |
e440a328 | 5835 | Binary_expression::do_discarding_value() |
5836 | { | |
5837 | if (this->op_ == OPERATOR_OROR || this->op_ == OPERATOR_ANDAND) | |
4f2138d7 | 5838 | return this->right_->discarding_value(); |
e440a328 | 5839 | else |
4f2138d7 | 5840 | { |
5841 | this->unused_value_error(); | |
5842 | return false; | |
5843 | } | |
e440a328 | 5844 | } |
5845 | ||
5846 | // Get type. | |
5847 | ||
5848 | Type* | |
5849 | Binary_expression::do_type() | |
5850 | { | |
5f5fea79 | 5851 | if (this->classification() == EXPRESSION_ERROR) |
5852 | return Type::make_error_type(); | |
5853 | ||
e440a328 | 5854 | switch (this->op_) |
5855 | { | |
e440a328 | 5856 | case OPERATOR_EQEQ: |
5857 | case OPERATOR_NOTEQ: | |
5858 | case OPERATOR_LT: | |
5859 | case OPERATOR_LE: | |
5860 | case OPERATOR_GT: | |
5861 | case OPERATOR_GE: | |
e90c9dfc | 5862 | if (this->type_ == NULL) |
5863 | this->type_ = Type::make_boolean_type(); | |
5864 | return this->type_; | |
e440a328 | 5865 | |
5866 | case OPERATOR_PLUS: | |
5867 | case OPERATOR_MINUS: | |
5868 | case OPERATOR_OR: | |
5869 | case OPERATOR_XOR: | |
5870 | case OPERATOR_MULT: | |
5871 | case OPERATOR_DIV: | |
5872 | case OPERATOR_MOD: | |
5873 | case OPERATOR_AND: | |
5874 | case OPERATOR_BITCLEAR: | |
e90c9dfc | 5875 | case OPERATOR_OROR: |
5876 | case OPERATOR_ANDAND: | |
e440a328 | 5877 | { |
0c77715b | 5878 | Type* type; |
5879 | if (!Binary_expression::operation_type(this->op_, | |
5880 | this->left_->type(), | |
5881 | this->right_->type(), | |
5882 | &type)) | |
5883 | return Type::make_error_type(); | |
5884 | return type; | |
e440a328 | 5885 | } |
5886 | ||
5887 | case OPERATOR_LSHIFT: | |
5888 | case OPERATOR_RSHIFT: | |
5889 | return this->left_->type(); | |
5890 | ||
5891 | default: | |
c3e6f413 | 5892 | go_unreachable(); |
e440a328 | 5893 | } |
5894 | } | |
5895 | ||
5896 | // Set type for a binary expression. | |
5897 | ||
5898 | void | |
5899 | Binary_expression::do_determine_type(const Type_context* context) | |
5900 | { | |
5901 | Type* tleft = this->left_->type(); | |
5902 | Type* tright = this->right_->type(); | |
5903 | ||
5904 | // Both sides should have the same type, except for the shift | |
5905 | // operations. For a comparison, we should ignore the incoming | |
5906 | // type. | |
5907 | ||
5908 | bool is_shift_op = (this->op_ == OPERATOR_LSHIFT | |
5909 | || this->op_ == OPERATOR_RSHIFT); | |
5910 | ||
5911 | bool is_comparison = (this->op_ == OPERATOR_EQEQ | |
5912 | || this->op_ == OPERATOR_NOTEQ | |
5913 | || this->op_ == OPERATOR_LT | |
5914 | || this->op_ == OPERATOR_LE | |
5915 | || this->op_ == OPERATOR_GT | |
5916 | || this->op_ == OPERATOR_GE); | |
5917 | ||
c999c2a7 | 5918 | // For constant expressions, the context of the result is not useful in |
5919 | // determining the types of the operands. It is only legal to use abstract | |
5920 | // boolean, numeric, and string constants as operands where it is legal to | |
5921 | // use non-abstract boolean, numeric, and string constants, respectively. | |
5922 | // Any issues with the operation will be resolved in the check_types pass. | |
5923 | bool is_constant_expr = (this->left_->is_constant() | |
5924 | && this->right_->is_constant()); | |
5925 | ||
e440a328 | 5926 | Type_context subcontext(*context); |
5927 | ||
9c4ff2ce | 5928 | if (is_constant_expr && !is_shift_op) |
af7a5274 | 5929 | { |
5930 | subcontext.type = NULL; | |
5931 | subcontext.may_be_abstract = true; | |
5932 | } | |
5933 | else if (is_comparison) | |
e440a328 | 5934 | { |
5935 | // In a comparison, the context does not determine the types of | |
5936 | // the operands. | |
5937 | subcontext.type = NULL; | |
5938 | } | |
5939 | ||
5940 | // Set the context for the left hand operand. | |
5941 | if (is_shift_op) | |
5942 | { | |
b40dc774 | 5943 | // The right hand operand of a shift plays no role in |
5944 | // determining the type of the left hand operand. | |
e440a328 | 5945 | } |
5946 | else if (!tleft->is_abstract()) | |
5947 | subcontext.type = tleft; | |
5948 | else if (!tright->is_abstract()) | |
5949 | subcontext.type = tright; | |
5950 | else if (subcontext.type == NULL) | |
5951 | { | |
5952 | if ((tleft->integer_type() != NULL && tright->integer_type() != NULL) | |
5953 | || (tleft->float_type() != NULL && tright->float_type() != NULL) | |
5954 | || (tleft->complex_type() != NULL && tright->complex_type() != NULL)) | |
5955 | { | |
5956 | // Both sides have an abstract integer, abstract float, or | |
5957 | // abstract complex type. Just let CONTEXT determine | |
5958 | // whether they may remain abstract or not. | |
5959 | } | |
5960 | else if (tleft->complex_type() != NULL) | |
5961 | subcontext.type = tleft; | |
5962 | else if (tright->complex_type() != NULL) | |
5963 | subcontext.type = tright; | |
5964 | else if (tleft->float_type() != NULL) | |
5965 | subcontext.type = tleft; | |
5966 | else if (tright->float_type() != NULL) | |
5967 | subcontext.type = tright; | |
5968 | else | |
5969 | subcontext.type = tleft; | |
f58a23ae | 5970 | |
5971 | if (subcontext.type != NULL && !context->may_be_abstract) | |
5972 | subcontext.type = subcontext.type->make_non_abstract_type(); | |
e440a328 | 5973 | } |
5974 | ||
af7a5274 | 5975 | this->left_->determine_type(&subcontext); |
e440a328 | 5976 | |
e440a328 | 5977 | if (is_shift_op) |
5978 | { | |
b40dc774 | 5979 | // We may have inherited an unusable type for the shift operand. |
5980 | // Give a useful error if that happened. | |
5981 | if (tleft->is_abstract() | |
5982 | && subcontext.type != NULL | |
8ab6effb | 5983 | && !subcontext.may_be_abstract |
f6bc81e6 | 5984 | && subcontext.type->interface_type() == NULL |
8ab6effb | 5985 | && subcontext.type->integer_type() == NULL) |
b40dc774 | 5986 | this->report_error(("invalid context-determined non-integer type " |
8ab6effb | 5987 | "for left operand of shift")); |
b40dc774 | 5988 | |
5989 | // The context for the right hand operand is the same as for the | |
5990 | // left hand operand, except for a shift operator. | |
e440a328 | 5991 | subcontext.type = Type::lookup_integer_type("uint"); |
5992 | subcontext.may_be_abstract = false; | |
5993 | } | |
5994 | ||
af7a5274 | 5995 | this->right_->determine_type(&subcontext); |
e90c9dfc | 5996 | |
5997 | if (is_comparison) | |
5998 | { | |
5999 | if (this->type_ != NULL && !this->type_->is_abstract()) | |
6000 | ; | |
6001 | else if (context->type != NULL && context->type->is_boolean_type()) | |
6002 | this->type_ = context->type; | |
6003 | else if (!context->may_be_abstract) | |
6004 | this->type_ = Type::lookup_bool_type(); | |
6005 | } | |
e440a328 | 6006 | } |
6007 | ||
6008 | // Report an error if the binary operator OP does not support TYPE. | |
be8b5eee | 6009 | // OTYPE is the type of the other operand. Return whether the |
6010 | // operation is OK. This should not be used for shift. | |
e440a328 | 6011 | |
6012 | bool | |
be8b5eee | 6013 | Binary_expression::check_operator_type(Operator op, Type* type, Type* otype, |
b13c66cd | 6014 | Location location) |
e440a328 | 6015 | { |
6016 | switch (op) | |
6017 | { | |
6018 | case OPERATOR_OROR: | |
6019 | case OPERATOR_ANDAND: | |
c999c2a7 | 6020 | if (!type->is_boolean_type() |
6021 | || !otype->is_boolean_type()) | |
e440a328 | 6022 | { |
631d5788 | 6023 | go_error_at(location, "expected boolean type"); |
e440a328 | 6024 | return false; |
6025 | } | |
6026 | break; | |
6027 | ||
6028 | case OPERATOR_EQEQ: | |
6029 | case OPERATOR_NOTEQ: | |
e9d3367e | 6030 | { |
6031 | std::string reason; | |
6032 | if (!Type::are_compatible_for_comparison(true, type, otype, &reason)) | |
6033 | { | |
631d5788 | 6034 | go_error_at(location, "%s", reason.c_str()); |
e9d3367e | 6035 | return false; |
6036 | } | |
6037 | } | |
e440a328 | 6038 | break; |
6039 | ||
6040 | case OPERATOR_LT: | |
6041 | case OPERATOR_LE: | |
6042 | case OPERATOR_GT: | |
6043 | case OPERATOR_GE: | |
e9d3367e | 6044 | { |
6045 | std::string reason; | |
6046 | if (!Type::are_compatible_for_comparison(false, type, otype, &reason)) | |
6047 | { | |
631d5788 | 6048 | go_error_at(location, "%s", reason.c_str()); |
e9d3367e | 6049 | return false; |
6050 | } | |
6051 | } | |
e440a328 | 6052 | break; |
6053 | ||
6054 | case OPERATOR_PLUS: | |
6055 | case OPERATOR_PLUSEQ: | |
c999c2a7 | 6056 | if ((!type->is_numeric_type() && !type->is_string_type()) |
6057 | || (!otype->is_numeric_type() && !otype->is_string_type())) | |
e440a328 | 6058 | { |
631d5788 | 6059 | go_error_at(location, |
e440a328 | 6060 | "expected integer, floating, complex, or string type"); |
6061 | return false; | |
6062 | } | |
6063 | break; | |
6064 | ||
6065 | case OPERATOR_MINUS: | |
6066 | case OPERATOR_MINUSEQ: | |
6067 | case OPERATOR_MULT: | |
6068 | case OPERATOR_MULTEQ: | |
6069 | case OPERATOR_DIV: | |
6070 | case OPERATOR_DIVEQ: | |
c999c2a7 | 6071 | if (!type->is_numeric_type() || !otype->is_numeric_type()) |
e440a328 | 6072 | { |
631d5788 | 6073 | go_error_at(location, "expected integer, floating, or complex type"); |
e440a328 | 6074 | return false; |
6075 | } | |
6076 | break; | |
6077 | ||
6078 | case OPERATOR_MOD: | |
6079 | case OPERATOR_MODEQ: | |
6080 | case OPERATOR_OR: | |
6081 | case OPERATOR_OREQ: | |
6082 | case OPERATOR_AND: | |
6083 | case OPERATOR_ANDEQ: | |
6084 | case OPERATOR_XOR: | |
6085 | case OPERATOR_XOREQ: | |
6086 | case OPERATOR_BITCLEAR: | |
6087 | case OPERATOR_BITCLEAREQ: | |
c999c2a7 | 6088 | if (type->integer_type() == NULL || otype->integer_type() == NULL) |
e440a328 | 6089 | { |
631d5788 | 6090 | go_error_at(location, "expected integer type"); |
e440a328 | 6091 | return false; |
6092 | } | |
6093 | break; | |
6094 | ||
6095 | default: | |
c3e6f413 | 6096 | go_unreachable(); |
e440a328 | 6097 | } |
6098 | ||
6099 | return true; | |
6100 | } | |
6101 | ||
6102 | // Check types. | |
6103 | ||
6104 | void | |
6105 | Binary_expression::do_check_types(Gogo*) | |
6106 | { | |
5f5fea79 | 6107 | if (this->classification() == EXPRESSION_ERROR) |
6108 | return; | |
6109 | ||
e440a328 | 6110 | Type* left_type = this->left_->type(); |
6111 | Type* right_type = this->right_->type(); | |
5c13bd80 | 6112 | if (left_type->is_error() || right_type->is_error()) |
9fe897ef | 6113 | { |
6114 | this->set_is_error(); | |
6115 | return; | |
6116 | } | |
e440a328 | 6117 | |
6118 | if (this->op_ == OPERATOR_EQEQ | |
6119 | || this->op_ == OPERATOR_NOTEQ | |
6120 | || this->op_ == OPERATOR_LT | |
6121 | || this->op_ == OPERATOR_LE | |
6122 | || this->op_ == OPERATOR_GT | |
6123 | || this->op_ == OPERATOR_GE) | |
6124 | { | |
907c5ecd | 6125 | if (left_type->is_nil_type() && right_type->is_nil_type()) |
6126 | { | |
6127 | this->report_error(_("invalid comparison of nil with nil")); | |
6128 | return; | |
6129 | } | |
e440a328 | 6130 | if (!Type::are_assignable(left_type, right_type, NULL) |
6131 | && !Type::are_assignable(right_type, left_type, NULL)) | |
6132 | { | |
6133 | this->report_error(_("incompatible types in binary expression")); | |
6134 | return; | |
6135 | } | |
6136 | if (!Binary_expression::check_operator_type(this->op_, left_type, | |
be8b5eee | 6137 | right_type, |
e440a328 | 6138 | this->location()) |
6139 | || !Binary_expression::check_operator_type(this->op_, right_type, | |
be8b5eee | 6140 | left_type, |
e440a328 | 6141 | this->location())) |
6142 | { | |
6143 | this->set_is_error(); | |
6144 | return; | |
6145 | } | |
6146 | } | |
6147 | else if (this->op_ != OPERATOR_LSHIFT && this->op_ != OPERATOR_RSHIFT) | |
6148 | { | |
6149 | if (!Type::are_compatible_for_binop(left_type, right_type)) | |
6150 | { | |
6151 | this->report_error(_("incompatible types in binary expression")); | |
6152 | return; | |
6153 | } | |
6154 | if (!Binary_expression::check_operator_type(this->op_, left_type, | |
be8b5eee | 6155 | right_type, |
e440a328 | 6156 | this->location())) |
6157 | { | |
6158 | this->set_is_error(); | |
6159 | return; | |
6160 | } | |
5c65b19d | 6161 | if (this->op_ == OPERATOR_DIV || this->op_ == OPERATOR_MOD) |
6162 | { | |
6163 | // Division by a zero integer constant is an error. | |
6164 | Numeric_constant rconst; | |
6165 | unsigned long rval; | |
6166 | if (left_type->integer_type() != NULL | |
6167 | && this->right_->numeric_constant_value(&rconst) | |
6168 | && rconst.to_unsigned_long(&rval) == Numeric_constant::NC_UL_VALID | |
6169 | && rval == 0) | |
6170 | { | |
6171 | this->report_error(_("integer division by zero")); | |
6172 | return; | |
6173 | } | |
6174 | } | |
e440a328 | 6175 | } |
6176 | else | |
6177 | { | |
6178 | if (left_type->integer_type() == NULL) | |
6179 | this->report_error(_("shift of non-integer operand")); | |
6180 | ||
6b5e0fac | 6181 | if (right_type->is_string_type()) |
6182 | this->report_error(_("shift count not unsigned integer")); | |
6183 | else if (!right_type->is_abstract() | |
e440a328 | 6184 | && (right_type->integer_type() == NULL |
6185 | || !right_type->integer_type()->is_unsigned())) | |
6186 | this->report_error(_("shift count not unsigned integer")); | |
6187 | else | |
6188 | { | |
0c77715b | 6189 | Numeric_constant nc; |
6190 | if (this->right_->numeric_constant_value(&nc)) | |
e440a328 | 6191 | { |
0c77715b | 6192 | mpz_t val; |
6193 | if (!nc.to_int(&val)) | |
6194 | this->report_error(_("shift count not unsigned integer")); | |
6195 | else | |
a4eba91b | 6196 | { |
0c77715b | 6197 | if (mpz_sgn(val) < 0) |
6198 | { | |
6199 | this->report_error(_("negative shift count")); | |
0c77715b | 6200 | Location rloc = this->right_->location(); |
e67508fa | 6201 | this->right_ = Expression::make_integer_ul(0, right_type, |
6202 | rloc); | |
0c77715b | 6203 | } |
6204 | mpz_clear(val); | |
a4eba91b | 6205 | } |
e440a328 | 6206 | } |
e440a328 | 6207 | } |
6208 | } | |
6209 | } | |
6210 | ||
ea664253 | 6211 | // Get the backend representation for a binary expression. |
e440a328 | 6212 | |
ea664253 | 6213 | Bexpression* |
6214 | Binary_expression::do_get_backend(Translate_context* context) | |
e440a328 | 6215 | { |
1b1f2abf | 6216 | Gogo* gogo = context->gogo(); |
a32698ee | 6217 | Location loc = this->location(); |
6218 | Type* left_type = this->left_->type(); | |
6219 | Type* right_type = this->right_->type(); | |
1b1f2abf | 6220 | |
e440a328 | 6221 | bool use_left_type = true; |
6222 | bool is_shift_op = false; | |
29a2d1d8 | 6223 | bool is_idiv_op = false; |
e440a328 | 6224 | switch (this->op_) |
6225 | { | |
6226 | case OPERATOR_EQEQ: | |
6227 | case OPERATOR_NOTEQ: | |
6228 | case OPERATOR_LT: | |
6229 | case OPERATOR_LE: | |
6230 | case OPERATOR_GT: | |
6231 | case OPERATOR_GE: | |
ea664253 | 6232 | return Expression::comparison(context, this->type_, this->op_, |
6233 | this->left_, this->right_, loc); | |
e440a328 | 6234 | |
6235 | case OPERATOR_OROR: | |
e440a328 | 6236 | case OPERATOR_ANDAND: |
e440a328 | 6237 | use_left_type = false; |
6238 | break; | |
6239 | case OPERATOR_PLUS: | |
e440a328 | 6240 | case OPERATOR_MINUS: |
e440a328 | 6241 | case OPERATOR_OR: |
e440a328 | 6242 | case OPERATOR_XOR: |
e440a328 | 6243 | case OPERATOR_MULT: |
e440a328 | 6244 | break; |
6245 | case OPERATOR_DIV: | |
a32698ee | 6246 | if (left_type->float_type() != NULL || left_type->complex_type() != NULL) |
6247 | break; | |
729f8831 | 6248 | // Fall through. |
e440a328 | 6249 | case OPERATOR_MOD: |
29a2d1d8 | 6250 | is_idiv_op = true; |
e440a328 | 6251 | break; |
6252 | case OPERATOR_LSHIFT: | |
e440a328 | 6253 | case OPERATOR_RSHIFT: |
e440a328 | 6254 | is_shift_op = true; |
6255 | break; | |
e440a328 | 6256 | case OPERATOR_BITCLEAR: |
a32698ee | 6257 | this->right_ = Expression::make_unary(OPERATOR_XOR, this->right_, loc); |
6258 | case OPERATOR_AND: | |
e440a328 | 6259 | break; |
6260 | default: | |
c3e6f413 | 6261 | go_unreachable(); |
e440a328 | 6262 | } |
6263 | ||
736a16ba | 6264 | // The only binary operation for string is +, and that should have |
6265 | // been converted to a String_concat_expression in do_lower. | |
6266 | go_assert(!left_type->is_string_type()); | |
a32698ee | 6267 | |
6268 | // For complex division Go might want slightly different results than the | |
6269 | // backend implementation provides, so we have our own runtime routine. | |
1850e20c | 6270 | if (this->op_ == OPERATOR_DIV && this->left_->type()->complex_type() != NULL) |
6271 | { | |
a32698ee | 6272 | Runtime::Function complex_code; |
1850e20c | 6273 | switch (this->left_->type()->complex_type()->bits()) |
6274 | { | |
6275 | case 64: | |
a32698ee | 6276 | complex_code = Runtime::COMPLEX64_DIV; |
1850e20c | 6277 | break; |
6278 | case 128: | |
a32698ee | 6279 | complex_code = Runtime::COMPLEX128_DIV; |
1850e20c | 6280 | break; |
6281 | default: | |
6282 | go_unreachable(); | |
6283 | } | |
a32698ee | 6284 | Expression* complex_div = |
6285 | Runtime::make_call(complex_code, loc, 2, this->left_, this->right_); | |
ea664253 | 6286 | return complex_div->get_backend(context); |
1850e20c | 6287 | } |
6288 | ||
ea664253 | 6289 | Bexpression* left = this->left_->get_backend(context); |
6290 | Bexpression* right = this->right_->get_backend(context); | |
e440a328 | 6291 | |
a32698ee | 6292 | Type* type = use_left_type ? left_type : right_type; |
6293 | Btype* btype = type->get_backend(gogo); | |
6294 | ||
6295 | Bexpression* ret = | |
6296 | gogo->backend()->binary_expression(this->op_, left, right, loc); | |
6297 | ret = gogo->backend()->convert_expression(btype, ret, loc); | |
e440a328 | 6298 | |
a32698ee | 6299 | // Initialize overflow constants. |
6300 | Bexpression* overflow; | |
6301 | mpz_t zero; | |
6302 | mpz_init_set_ui(zero, 0UL); | |
6303 | mpz_t one; | |
6304 | mpz_init_set_ui(one, 1UL); | |
6305 | mpz_t neg_one; | |
6306 | mpz_init_set_si(neg_one, -1); | |
e440a328 | 6307 | |
a32698ee | 6308 | Btype* left_btype = left_type->get_backend(gogo); |
6309 | Btype* right_btype = right_type->get_backend(gogo); | |
e440a328 | 6310 | |
6311 | // In Go, a shift larger than the size of the type is well-defined. | |
a32698ee | 6312 | // This is not true in C, so we need to insert a conditional. |
e440a328 | 6313 | if (is_shift_op) |
6314 | { | |
a32698ee | 6315 | go_assert(left_type->integer_type() != NULL); |
e440a328 | 6316 | |
a32698ee | 6317 | int bits = left_type->integer_type()->bits(); |
a7c5b619 | 6318 | |
6319 | Numeric_constant nc; | |
6320 | unsigned long ul; | |
6321 | if (!this->right_->numeric_constant_value(&nc) | |
6322 | || nc.to_unsigned_long(&ul) != Numeric_constant::NC_UL_VALID | |
6323 | || ul >= static_cast<unsigned long>(bits)) | |
e440a328 | 6324 | { |
a7c5b619 | 6325 | mpz_t bitsval; |
6326 | mpz_init_set_ui(bitsval, bits); | |
6327 | Bexpression* bits_expr = | |
6328 | gogo->backend()->integer_constant_expression(right_btype, bitsval); | |
6329 | Bexpression* compare = | |
6330 | gogo->backend()->binary_expression(OPERATOR_LT, | |
6331 | right, bits_expr, loc); | |
6332 | ||
6333 | Bexpression* zero_expr = | |
6334 | gogo->backend()->integer_constant_expression(left_btype, zero); | |
6335 | overflow = zero_expr; | |
6336 | Bfunction* bfn = context->function()->func_value()->get_decl(); | |
6337 | if (this->op_ == OPERATOR_RSHIFT | |
6338 | && !left_type->integer_type()->is_unsigned()) | |
6339 | { | |
6340 | Bexpression* neg_expr = | |
6341 | gogo->backend()->binary_expression(OPERATOR_LT, left, | |
6342 | zero_expr, loc); | |
6343 | Bexpression* neg_one_expr = | |
6344 | gogo->backend()->integer_constant_expression(left_btype, | |
6345 | neg_one); | |
6346 | overflow = gogo->backend()->conditional_expression(bfn, | |
6347 | btype, | |
6348 | neg_expr, | |
6349 | neg_one_expr, | |
6350 | zero_expr, | |
6351 | loc); | |
6352 | } | |
6353 | ret = gogo->backend()->conditional_expression(bfn, btype, compare, | |
6354 | ret, overflow, loc); | |
6355 | mpz_clear(bitsval); | |
29a2d1d8 | 6356 | } |
29a2d1d8 | 6357 | } |
6358 | ||
6359 | // Add checks for division by zero and division overflow as needed. | |
6360 | if (is_idiv_op) | |
6361 | { | |
5c3f3470 | 6362 | if (gogo->check_divide_by_zero()) |
29a2d1d8 | 6363 | { |
6364 | // right == 0 | |
a32698ee | 6365 | Bexpression* zero_expr = |
6366 | gogo->backend()->integer_constant_expression(right_btype, zero); | |
6367 | Bexpression* check = | |
6368 | gogo->backend()->binary_expression(OPERATOR_EQEQ, | |
6369 | right, zero_expr, loc); | |
29a2d1d8 | 6370 | |
a32698ee | 6371 | // __go_runtime_error(RUNTIME_ERROR_DIVISION_BY_ZERO) |
29a2d1d8 | 6372 | int errcode = RUNTIME_ERROR_DIVISION_BY_ZERO; |
ea664253 | 6373 | Bexpression* crash = gogo->runtime_error(errcode, |
6374 | loc)->get_backend(context); | |
29a2d1d8 | 6375 | |
6376 | // right == 0 ? (__go_runtime_error(...), 0) : ret | |
93715b75 | 6377 | Bfunction* bfn = context->function()->func_value()->get_decl(); |
6378 | ret = gogo->backend()->conditional_expression(bfn, btype, | |
6379 | check, crash, | |
ea664253 | 6380 | ret, loc); |
b13c66cd | 6381 | } |
6382 | ||
5c3f3470 | 6383 | if (gogo->check_divide_overflow()) |
29a2d1d8 | 6384 | { |
6385 | // right == -1 | |
6386 | // FIXME: It would be nice to say that this test is expected | |
6387 | // to return false. | |
a32698ee | 6388 | |
6389 | Bexpression* neg_one_expr = | |
6390 | gogo->backend()->integer_constant_expression(right_btype, neg_one); | |
6391 | Bexpression* check = | |
6392 | gogo->backend()->binary_expression(OPERATOR_EQEQ, | |
6393 | right, neg_one_expr, loc); | |
6394 | ||
6395 | Bexpression* zero_expr = | |
6396 | gogo->backend()->integer_constant_expression(btype, zero); | |
6397 | Bexpression* one_expr = | |
6398 | gogo->backend()->integer_constant_expression(btype, one); | |
93715b75 | 6399 | Bfunction* bfn = context->function()->func_value()->get_decl(); |
a32698ee | 6400 | |
6401 | if (type->integer_type()->is_unsigned()) | |
29a2d1d8 | 6402 | { |
6403 | // An unsigned -1 is the largest possible number, so | |
6404 | // dividing is always 1 or 0. | |
a32698ee | 6405 | |
6406 | Bexpression* cmp = | |
6407 | gogo->backend()->binary_expression(OPERATOR_EQEQ, | |
6408 | left, right, loc); | |
29a2d1d8 | 6409 | if (this->op_ == OPERATOR_DIV) |
a32698ee | 6410 | overflow = |
93715b75 | 6411 | gogo->backend()->conditional_expression(bfn, btype, cmp, |
a32698ee | 6412 | one_expr, zero_expr, |
6413 | loc); | |
29a2d1d8 | 6414 | else |
a32698ee | 6415 | overflow = |
93715b75 | 6416 | gogo->backend()->conditional_expression(bfn, btype, cmp, |
a32698ee | 6417 | zero_expr, left, |
6418 | loc); | |
29a2d1d8 | 6419 | } |
6420 | else | |
6421 | { | |
6422 | // Computing left / -1 is the same as computing - left, | |
6423 | // which does not overflow since Go sets -fwrapv. | |
6424 | if (this->op_ == OPERATOR_DIV) | |
a32698ee | 6425 | { |
6426 | Expression* negate_expr = | |
6427 | Expression::make_unary(OPERATOR_MINUS, this->left_, loc); | |
ea664253 | 6428 | overflow = negate_expr->get_backend(context); |
a32698ee | 6429 | } |
29a2d1d8 | 6430 | else |
a32698ee | 6431 | overflow = zero_expr; |
29a2d1d8 | 6432 | } |
a32698ee | 6433 | overflow = gogo->backend()->convert_expression(btype, overflow, loc); |
29a2d1d8 | 6434 | |
6435 | // right == -1 ? - left : ret | |
93715b75 | 6436 | ret = gogo->backend()->conditional_expression(bfn, btype, |
6437 | check, overflow, | |
a32698ee | 6438 | ret, loc); |
29a2d1d8 | 6439 | } |
e440a328 | 6440 | } |
6441 | ||
a32698ee | 6442 | mpz_clear(zero); |
6443 | mpz_clear(one); | |
6444 | mpz_clear(neg_one); | |
ea664253 | 6445 | return ret; |
e440a328 | 6446 | } |
6447 | ||
6448 | // Export a binary expression. | |
6449 | ||
6450 | void | |
548be246 | 6451 | Binary_expression::do_export(Export_function_body* efb) const |
e440a328 | 6452 | { |
548be246 | 6453 | efb->write_c_string("("); |
6454 | this->left_->export_expression(efb); | |
e440a328 | 6455 | switch (this->op_) |
6456 | { | |
6457 | case OPERATOR_OROR: | |
548be246 | 6458 | efb->write_c_string(" || "); |
e440a328 | 6459 | break; |
6460 | case OPERATOR_ANDAND: | |
548be246 | 6461 | efb->write_c_string(" && "); |
e440a328 | 6462 | break; |
6463 | case OPERATOR_EQEQ: | |
548be246 | 6464 | efb->write_c_string(" == "); |
e440a328 | 6465 | break; |
6466 | case OPERATOR_NOTEQ: | |
548be246 | 6467 | efb->write_c_string(" != "); |
e440a328 | 6468 | break; |
6469 | case OPERATOR_LT: | |
548be246 | 6470 | efb->write_c_string(" < "); |
e440a328 | 6471 | break; |
6472 | case OPERATOR_LE: | |
548be246 | 6473 | efb->write_c_string(" <= "); |
e440a328 | 6474 | break; |
6475 | case OPERATOR_GT: | |
548be246 | 6476 | efb->write_c_string(" > "); |
e440a328 | 6477 | break; |
6478 | case OPERATOR_GE: | |
548be246 | 6479 | efb->write_c_string(" >= "); |
e440a328 | 6480 | break; |
6481 | case OPERATOR_PLUS: | |
548be246 | 6482 | efb->write_c_string(" + "); |
e440a328 | 6483 | break; |
6484 | case OPERATOR_MINUS: | |
548be246 | 6485 | efb->write_c_string(" - "); |
e440a328 | 6486 | break; |
6487 | case OPERATOR_OR: | |
548be246 | 6488 | efb->write_c_string(" | "); |
e440a328 | 6489 | break; |
6490 | case OPERATOR_XOR: | |
548be246 | 6491 | efb->write_c_string(" ^ "); |
e440a328 | 6492 | break; |
6493 | case OPERATOR_MULT: | |
548be246 | 6494 | efb->write_c_string(" * "); |
e440a328 | 6495 | break; |
6496 | case OPERATOR_DIV: | |
548be246 | 6497 | efb->write_c_string(" / "); |
e440a328 | 6498 | break; |
6499 | case OPERATOR_MOD: | |
548be246 | 6500 | efb->write_c_string(" % "); |
e440a328 | 6501 | break; |
6502 | case OPERATOR_LSHIFT: | |
548be246 | 6503 | efb->write_c_string(" << "); |
e440a328 | 6504 | break; |
6505 | case OPERATOR_RSHIFT: | |
548be246 | 6506 | efb->write_c_string(" >> "); |
e440a328 | 6507 | break; |
6508 | case OPERATOR_AND: | |
548be246 | 6509 | efb->write_c_string(" & "); |
e440a328 | 6510 | break; |
6511 | case OPERATOR_BITCLEAR: | |
548be246 | 6512 | efb->write_c_string(" &^ "); |
e440a328 | 6513 | break; |
6514 | default: | |
c3e6f413 | 6515 | go_unreachable(); |
e440a328 | 6516 | } |
548be246 | 6517 | this->right_->export_expression(efb); |
6518 | efb->write_c_string(")"); | |
e440a328 | 6519 | } |
6520 | ||
6521 | // Import a binary expression. | |
6522 | ||
6523 | Expression* | |
bc8e2ef4 | 6524 | Binary_expression::do_import(Import_expression* imp, Location loc) |
e440a328 | 6525 | { |
6526 | imp->require_c_string("("); | |
6527 | ||
9b92780c | 6528 | Expression* left = Expression::import_expression(imp, loc); |
e440a328 | 6529 | |
6530 | Operator op; | |
6531 | if (imp->match_c_string(" || ")) | |
6532 | { | |
6533 | op = OPERATOR_OROR; | |
6534 | imp->advance(4); | |
6535 | } | |
6536 | else if (imp->match_c_string(" && ")) | |
6537 | { | |
6538 | op = OPERATOR_ANDAND; | |
6539 | imp->advance(4); | |
6540 | } | |
6541 | else if (imp->match_c_string(" == ")) | |
6542 | { | |
6543 | op = OPERATOR_EQEQ; | |
6544 | imp->advance(4); | |
6545 | } | |
6546 | else if (imp->match_c_string(" != ")) | |
6547 | { | |
6548 | op = OPERATOR_NOTEQ; | |
6549 | imp->advance(4); | |
6550 | } | |
6551 | else if (imp->match_c_string(" < ")) | |
6552 | { | |
6553 | op = OPERATOR_LT; | |
6554 | imp->advance(3); | |
6555 | } | |
6556 | else if (imp->match_c_string(" <= ")) | |
6557 | { | |
6558 | op = OPERATOR_LE; | |
6559 | imp->advance(4); | |
6560 | } | |
6561 | else if (imp->match_c_string(" > ")) | |
6562 | { | |
6563 | op = OPERATOR_GT; | |
6564 | imp->advance(3); | |
6565 | } | |
6566 | else if (imp->match_c_string(" >= ")) | |
6567 | { | |
6568 | op = OPERATOR_GE; | |
6569 | imp->advance(4); | |
6570 | } | |
6571 | else if (imp->match_c_string(" + ")) | |
6572 | { | |
6573 | op = OPERATOR_PLUS; | |
6574 | imp->advance(3); | |
6575 | } | |
6576 | else if (imp->match_c_string(" - ")) | |
6577 | { | |
6578 | op = OPERATOR_MINUS; | |
6579 | imp->advance(3); | |
6580 | } | |
6581 | else if (imp->match_c_string(" | ")) | |
6582 | { | |
6583 | op = OPERATOR_OR; | |
6584 | imp->advance(3); | |
6585 | } | |
6586 | else if (imp->match_c_string(" ^ ")) | |
6587 | { | |
6588 | op = OPERATOR_XOR; | |
6589 | imp->advance(3); | |
6590 | } | |
6591 | else if (imp->match_c_string(" * ")) | |
6592 | { | |
6593 | op = OPERATOR_MULT; | |
6594 | imp->advance(3); | |
6595 | } | |
6596 | else if (imp->match_c_string(" / ")) | |
6597 | { | |
6598 | op = OPERATOR_DIV; | |
6599 | imp->advance(3); | |
6600 | } | |
6601 | else if (imp->match_c_string(" % ")) | |
6602 | { | |
6603 | op = OPERATOR_MOD; | |
6604 | imp->advance(3); | |
6605 | } | |
6606 | else if (imp->match_c_string(" << ")) | |
6607 | { | |
6608 | op = OPERATOR_LSHIFT; | |
6609 | imp->advance(4); | |
6610 | } | |
6611 | else if (imp->match_c_string(" >> ")) | |
6612 | { | |
6613 | op = OPERATOR_RSHIFT; | |
6614 | imp->advance(4); | |
6615 | } | |
6616 | else if (imp->match_c_string(" & ")) | |
6617 | { | |
6618 | op = OPERATOR_AND; | |
6619 | imp->advance(3); | |
6620 | } | |
6621 | else if (imp->match_c_string(" &^ ")) | |
6622 | { | |
6623 | op = OPERATOR_BITCLEAR; | |
6624 | imp->advance(4); | |
6625 | } | |
6626 | else | |
6627 | { | |
631d5788 | 6628 | go_error_at(imp->location(), "unrecognized binary operator"); |
9b92780c | 6629 | return Expression::make_error(loc); |
e440a328 | 6630 | } |
6631 | ||
9b92780c | 6632 | Expression* right = Expression::import_expression(imp, loc); |
e440a328 | 6633 | |
6634 | imp->require_c_string(")"); | |
6635 | ||
9b92780c | 6636 | return Expression::make_binary(op, left, right, loc); |
e440a328 | 6637 | } |
6638 | ||
d751bb78 | 6639 | // Dump ast representation of a binary expression. |
6640 | ||
6641 | void | |
6642 | Binary_expression::do_dump_expression(Ast_dump_context* ast_dump_context) const | |
6643 | { | |
6644 | ast_dump_context->ostream() << "("; | |
6645 | ast_dump_context->dump_expression(this->left_); | |
6646 | ast_dump_context->ostream() << " "; | |
6647 | ast_dump_context->dump_operator(this->op_); | |
6648 | ast_dump_context->ostream() << " "; | |
6649 | ast_dump_context->dump_expression(this->right_); | |
6650 | ast_dump_context->ostream() << ") "; | |
6651 | } | |
6652 | ||
e440a328 | 6653 | // Make a binary expression. |
6654 | ||
6655 | Expression* | |
6656 | Expression::make_binary(Operator op, Expression* left, Expression* right, | |
b13c66cd | 6657 | Location location) |
e440a328 | 6658 | { |
6659 | return new Binary_expression(op, left, right, location); | |
6660 | } | |
6661 | ||
6662 | // Implement a comparison. | |
6663 | ||
a32698ee | 6664 | Bexpression* |
6665 | Expression::comparison(Translate_context* context, Type* result_type, | |
6666 | Operator op, Expression* left, Expression* right, | |
6667 | Location location) | |
e440a328 | 6668 | { |
2387f644 | 6669 | Type* left_type = left->type(); |
6670 | Type* right_type = right->type(); | |
ceeb12d7 | 6671 | |
e67508fa | 6672 | Expression* zexpr = Expression::make_integer_ul(0, NULL, location); |
1b1f2abf | 6673 | |
15c67ee2 | 6674 | if (left_type->is_string_type() && right_type->is_string_type()) |
e440a328 | 6675 | { |
6098d6cb | 6676 | if (op == OPERATOR_EQEQ || op == OPERATOR_NOTEQ) |
6677 | { | |
6678 | left = Runtime::make_call(Runtime::EQSTRING, location, 2, | |
6679 | left, right); | |
6680 | right = Expression::make_boolean(true, location); | |
6681 | } | |
6682 | else | |
6683 | { | |
6684 | left = Runtime::make_call(Runtime::CMPSTRING, location, 2, | |
6685 | left, right); | |
6686 | right = zexpr; | |
6687 | } | |
e440a328 | 6688 | } |
15c67ee2 | 6689 | else if ((left_type->interface_type() != NULL |
6690 | && right_type->interface_type() == NULL | |
6691 | && !right_type->is_nil_type()) | |
6692 | || (left_type->interface_type() == NULL | |
6693 | && !left_type->is_nil_type() | |
6694 | && right_type->interface_type() != NULL)) | |
e440a328 | 6695 | { |
6696 | // Comparing an interface value to a non-interface value. | |
6697 | if (left_type->interface_type() == NULL) | |
6698 | { | |
6699 | std::swap(left_type, right_type); | |
2387f644 | 6700 | std::swap(left, right); |
e440a328 | 6701 | } |
6702 | ||
6703 | // The right operand is not an interface. We need to take its | |
6704 | // address if it is not a pointer. | |
ceeb12d7 | 6705 | Expression* pointer_arg = NULL; |
e440a328 | 6706 | if (right_type->points_to() != NULL) |
2387f644 | 6707 | pointer_arg = right; |
e440a328 | 6708 | else |
6709 | { | |
2387f644 | 6710 | go_assert(right->is_addressable()); |
6711 | pointer_arg = Expression::make_unary(OPERATOR_AND, right, | |
ceeb12d7 | 6712 | location); |
e440a328 | 6713 | } |
e440a328 | 6714 | |
2387f644 | 6715 | Expression* descriptor = |
6716 | Expression::make_type_descriptor(right_type, location); | |
6717 | left = | |
ceeb12d7 | 6718 | Runtime::make_call((left_type->interface_type()->is_empty() |
6098d6cb | 6719 | ? Runtime::EFACEVALEQ |
6720 | : Runtime::IFACEVALEQ), | |
2387f644 | 6721 | location, 3, left, descriptor, |
ceeb12d7 | 6722 | pointer_arg); |
6098d6cb | 6723 | go_assert(op == OPERATOR_EQEQ || op == OPERATOR_NOTEQ); |
6724 | right = Expression::make_boolean(true, location); | |
e440a328 | 6725 | } |
6726 | else if (left_type->interface_type() != NULL | |
6727 | && right_type->interface_type() != NULL) | |
6728 | { | |
ceeb12d7 | 6729 | Runtime::Function compare_function; |
739bad04 | 6730 | if (left_type->interface_type()->is_empty() |
6731 | && right_type->interface_type()->is_empty()) | |
6098d6cb | 6732 | compare_function = Runtime::EFACEEQ; |
739bad04 | 6733 | else if (!left_type->interface_type()->is_empty() |
6734 | && !right_type->interface_type()->is_empty()) | |
6098d6cb | 6735 | compare_function = Runtime::IFACEEQ; |
739bad04 | 6736 | else |
6737 | { | |
6738 | if (left_type->interface_type()->is_empty()) | |
6739 | { | |
739bad04 | 6740 | std::swap(left_type, right_type); |
2387f644 | 6741 | std::swap(left, right); |
739bad04 | 6742 | } |
c484d925 | 6743 | go_assert(!left_type->interface_type()->is_empty()); |
6744 | go_assert(right_type->interface_type()->is_empty()); | |
6098d6cb | 6745 | compare_function = Runtime::IFACEEFACEEQ; |
739bad04 | 6746 | } |
6747 | ||
2387f644 | 6748 | left = Runtime::make_call(compare_function, location, 2, left, right); |
6098d6cb | 6749 | go_assert(op == OPERATOR_EQEQ || op == OPERATOR_NOTEQ); |
6750 | right = Expression::make_boolean(true, location); | |
e440a328 | 6751 | } |
6752 | ||
6753 | if (left_type->is_nil_type() | |
6754 | && (op == OPERATOR_EQEQ || op == OPERATOR_NOTEQ)) | |
6755 | { | |
6756 | std::swap(left_type, right_type); | |
2387f644 | 6757 | std::swap(left, right); |
e440a328 | 6758 | } |
6759 | ||
6760 | if (right_type->is_nil_type()) | |
6761 | { | |
2387f644 | 6762 | right = Expression::make_nil(location); |
e440a328 | 6763 | if (left_type->array_type() != NULL |
6764 | && left_type->array_type()->length() == NULL) | |
6765 | { | |
6766 | Array_type* at = left_type->array_type(); | |
44dbe1d7 | 6767 | bool is_lvalue = false; |
6768 | left = at->get_value_pointer(context->gogo(), left, is_lvalue); | |
e440a328 | 6769 | } |
6770 | else if (left_type->interface_type() != NULL) | |
6771 | { | |
6772 | // An interface is nil if the first field is nil. | |
2387f644 | 6773 | left = Expression::make_field_reference(left, 0, location); |
e440a328 | 6774 | } |
6775 | } | |
6776 | ||
ea664253 | 6777 | Bexpression* left_bexpr = left->get_backend(context); |
6778 | Bexpression* right_bexpr = right->get_backend(context); | |
e90c9dfc | 6779 | |
a32698ee | 6780 | Gogo* gogo = context->gogo(); |
6781 | Bexpression* ret = gogo->backend()->binary_expression(op, left_bexpr, | |
6782 | right_bexpr, location); | |
6783 | if (result_type != NULL) | |
6784 | ret = gogo->backend()->convert_expression(result_type->get_backend(gogo), | |
6785 | ret, location); | |
e440a328 | 6786 | return ret; |
6787 | } | |
6788 | ||
736a16ba | 6789 | // Class String_concat_expression. |
6790 | ||
6791 | bool | |
6792 | String_concat_expression::do_is_constant() const | |
6793 | { | |
6794 | for (Expression_list::const_iterator pe = this->exprs_->begin(); | |
6795 | pe != this->exprs_->end(); | |
6796 | ++pe) | |
6797 | { | |
6798 | if (!(*pe)->is_constant()) | |
6799 | return false; | |
6800 | } | |
6801 | return true; | |
6802 | } | |
6803 | ||
6804 | bool | |
3ae06f68 | 6805 | String_concat_expression::do_is_static_initializer() const |
736a16ba | 6806 | { |
6807 | for (Expression_list::const_iterator pe = this->exprs_->begin(); | |
6808 | pe != this->exprs_->end(); | |
6809 | ++pe) | |
6810 | { | |
3ae06f68 | 6811 | if (!(*pe)->is_static_initializer()) |
736a16ba | 6812 | return false; |
6813 | } | |
6814 | return true; | |
6815 | } | |
6816 | ||
6817 | Type* | |
6818 | String_concat_expression::do_type() | |
6819 | { | |
6820 | Type* t = this->exprs_->front()->type(); | |
6821 | Expression_list::iterator pe = this->exprs_->begin(); | |
6822 | ++pe; | |
6823 | for (; pe != this->exprs_->end(); ++pe) | |
6824 | { | |
6825 | Type* t1; | |
6826 | if (!Binary_expression::operation_type(OPERATOR_PLUS, t, | |
6827 | (*pe)->type(), | |
6828 | &t1)) | |
6829 | return Type::make_error_type(); | |
6830 | t = t1; | |
6831 | } | |
6832 | return t; | |
6833 | } | |
6834 | ||
6835 | void | |
6836 | String_concat_expression::do_determine_type(const Type_context* context) | |
6837 | { | |
6838 | Type_context subcontext(*context); | |
6839 | for (Expression_list::iterator pe = this->exprs_->begin(); | |
6840 | pe != this->exprs_->end(); | |
6841 | ++pe) | |
6842 | { | |
6843 | Type* t = (*pe)->type(); | |
6844 | if (!t->is_abstract()) | |
6845 | { | |
6846 | subcontext.type = t; | |
6847 | break; | |
6848 | } | |
6849 | } | |
6850 | if (subcontext.type == NULL) | |
6851 | subcontext.type = this->exprs_->front()->type(); | |
6852 | for (Expression_list::iterator pe = this->exprs_->begin(); | |
6853 | pe != this->exprs_->end(); | |
6854 | ++pe) | |
6855 | (*pe)->determine_type(&subcontext); | |
6856 | } | |
6857 | ||
6858 | void | |
6859 | String_concat_expression::do_check_types(Gogo*) | |
6860 | { | |
6861 | if (this->is_error_expression()) | |
6862 | return; | |
6863 | Type* t = this->exprs_->front()->type(); | |
6864 | if (t->is_error()) | |
6865 | { | |
6866 | this->set_is_error(); | |
6867 | return; | |
6868 | } | |
6869 | Expression_list::iterator pe = this->exprs_->begin(); | |
6870 | ++pe; | |
6871 | for (; pe != this->exprs_->end(); ++pe) | |
6872 | { | |
6873 | Type* t1 = (*pe)->type(); | |
6874 | if (!Type::are_compatible_for_binop(t, t1)) | |
6875 | { | |
6876 | this->report_error("incompatible types in binary expression"); | |
6877 | return; | |
6878 | } | |
6879 | if (!Binary_expression::check_operator_type(OPERATOR_PLUS, t, t1, | |
6880 | this->location())) | |
6881 | { | |
6882 | this->set_is_error(); | |
6883 | return; | |
6884 | } | |
6885 | } | |
6886 | } | |
6887 | ||
6888 | Expression* | |
6889 | String_concat_expression::do_flatten(Gogo*, Named_object*, | |
6890 | Statement_inserter*) | |
6891 | { | |
6892 | if (this->is_error_expression()) | |
6893 | return this; | |
6894 | Location loc = this->location(); | |
6895 | Type* type = this->type(); | |
6896 | Expression* nil_arg = Expression::make_nil(loc); | |
6897 | Expression* call; | |
6898 | switch (this->exprs_->size()) | |
6899 | { | |
6900 | case 0: case 1: | |
6901 | go_unreachable(); | |
6902 | ||
6903 | case 2: case 3: case 4: case 5: | |
6904 | { | |
6905 | Expression* len = Expression::make_integer_ul(this->exprs_->size(), | |
6906 | NULL, loc); | |
6907 | Array_type* arg_type = Type::make_array_type(type, len); | |
6908 | arg_type->set_is_array_incomparable(); | |
6909 | Expression* arg = | |
6910 | Expression::make_array_composite_literal(arg_type, this->exprs_, | |
6911 | loc); | |
6912 | Runtime::Function code; | |
6913 | switch (this->exprs_->size()) | |
6914 | { | |
6915 | default: | |
6916 | go_unreachable(); | |
6917 | case 2: | |
6918 | code = Runtime::CONCATSTRING2; | |
6919 | break; | |
6920 | case 3: | |
6921 | code = Runtime::CONCATSTRING3; | |
6922 | break; | |
6923 | case 4: | |
6924 | code = Runtime::CONCATSTRING4; | |
6925 | break; | |
6926 | case 5: | |
6927 | code = Runtime::CONCATSTRING5; | |
6928 | break; | |
6929 | } | |
6930 | call = Runtime::make_call(code, loc, 2, nil_arg, arg); | |
6931 | } | |
6932 | break; | |
6933 | ||
6934 | default: | |
6935 | { | |
6936 | Type* arg_type = Type::make_array_type(type, NULL); | |
6937 | Slice_construction_expression* sce = | |
6938 | Expression::make_slice_composite_literal(arg_type, this->exprs_, | |
6939 | loc); | |
6940 | sce->set_storage_does_not_escape(); | |
6941 | call = Runtime::make_call(Runtime::CONCATSTRINGS, loc, 2, nil_arg, | |
6942 | sce); | |
6943 | } | |
6944 | break; | |
6945 | } | |
6946 | ||
6947 | return Expression::make_cast(type, call, loc); | |
6948 | } | |
6949 | ||
6950 | void | |
6951 | String_concat_expression::do_dump_expression( | |
6952 | Ast_dump_context* ast_dump_context) const | |
6953 | { | |
6954 | ast_dump_context->ostream() << "concat("; | |
6955 | ast_dump_context->dump_expression_list(this->exprs_, false); | |
6956 | ast_dump_context->ostream() << ")"; | |
6957 | } | |
6958 | ||
6959 | Expression* | |
6960 | Expression::make_string_concat(Expression_list* exprs) | |
6961 | { | |
6962 | return new String_concat_expression(exprs); | |
6963 | } | |
6964 | ||
e440a328 | 6965 | // Class Bound_method_expression. |
6966 | ||
6967 | // Traversal. | |
6968 | ||
6969 | int | |
6970 | Bound_method_expression::do_traverse(Traverse* traverse) | |
6971 | { | |
e0659c9e | 6972 | return Expression::traverse(&this->expr_, traverse); |
e440a328 | 6973 | } |
6974 | ||
6975 | // Return the type of a bound method expression. The type of this | |
0afbb937 | 6976 | // object is simply the type of the method with no receiver. |
e440a328 | 6977 | |
6978 | Type* | |
6979 | Bound_method_expression::do_type() | |
6980 | { | |
0afbb937 | 6981 | Named_object* fn = this->method_->named_object(); |
6982 | Function_type* fntype; | |
6983 | if (fn->is_function()) | |
6984 | fntype = fn->func_value()->type(); | |
6985 | else if (fn->is_function_declaration()) | |
6986 | fntype = fn->func_declaration_value()->type(); | |
e0659c9e | 6987 | else |
6988 | return Type::make_error_type(); | |
0afbb937 | 6989 | return fntype->copy_without_receiver(); |
e440a328 | 6990 | } |
6991 | ||
6992 | // Determine the types of a method expression. | |
6993 | ||
6994 | void | |
6995 | Bound_method_expression::do_determine_type(const Type_context*) | |
6996 | { | |
0afbb937 | 6997 | Named_object* fn = this->method_->named_object(); |
6998 | Function_type* fntype; | |
6999 | if (fn->is_function()) | |
7000 | fntype = fn->func_value()->type(); | |
7001 | else if (fn->is_function_declaration()) | |
7002 | fntype = fn->func_declaration_value()->type(); | |
7003 | else | |
7004 | fntype = NULL; | |
e440a328 | 7005 | if (fntype == NULL || !fntype->is_method()) |
7006 | this->expr_->determine_type_no_context(); | |
7007 | else | |
7008 | { | |
7009 | Type_context subcontext(fntype->receiver()->type(), false); | |
7010 | this->expr_->determine_type(&subcontext); | |
7011 | } | |
7012 | } | |
7013 | ||
7014 | // Check the types of a method expression. | |
7015 | ||
7016 | void | |
7017 | Bound_method_expression::do_check_types(Gogo*) | |
7018 | { | |
0afbb937 | 7019 | Named_object* fn = this->method_->named_object(); |
7020 | if (!fn->is_function() && !fn->is_function_declaration()) | |
7021 | { | |
7022 | this->report_error(_("object is not a method")); | |
7023 | return; | |
7024 | } | |
7025 | ||
7026 | Function_type* fntype; | |
7027 | if (fn->is_function()) | |
7028 | fntype = fn->func_value()->type(); | |
7029 | else if (fn->is_function_declaration()) | |
7030 | fntype = fn->func_declaration_value()->type(); | |
e440a328 | 7031 | else |
0afbb937 | 7032 | go_unreachable(); |
7033 | Type* rtype = fntype->receiver()->type()->deref(); | |
7034 | Type* etype = (this->expr_type_ != NULL | |
7035 | ? this->expr_type_ | |
7036 | : this->expr_->type()); | |
7037 | etype = etype->deref(); | |
3a522dcc | 7038 | if (!Type::are_identical(rtype, etype, Type::COMPARE_TAGS, NULL)) |
0afbb937 | 7039 | this->report_error(_("method type does not match object type")); |
7040 | } | |
7041 | ||
7042 | // If a bound method expression is not simply called, then it is | |
7043 | // represented as a closure. The closure will hold a single variable, | |
7044 | // the receiver to pass to the method. The function will be a simple | |
7045 | // thunk that pulls that value from the closure and calls the method | |
7046 | // with the remaining arguments. | |
7047 | // | |
7048 | // Because method values are not common, we don't build all thunks for | |
7049 | // every methods, but instead only build them as we need them. In | |
7050 | // particular, we even build them on demand for methods defined in | |
7051 | // other packages. | |
7052 | ||
7053 | Bound_method_expression::Method_value_thunks | |
7054 | Bound_method_expression::method_value_thunks; | |
7055 | ||
7056 | // Find or create the thunk for METHOD. | |
7057 | ||
7058 | Named_object* | |
7059 | Bound_method_expression::create_thunk(Gogo* gogo, const Method* method, | |
7060 | Named_object* fn) | |
7061 | { | |
7062 | std::pair<Named_object*, Named_object*> val(fn, NULL); | |
7063 | std::pair<Method_value_thunks::iterator, bool> ins = | |
7064 | Bound_method_expression::method_value_thunks.insert(val); | |
7065 | if (!ins.second) | |
7066 | { | |
7067 | // We have seen this method before. | |
7068 | go_assert(ins.first->second != NULL); | |
7069 | return ins.first->second; | |
7070 | } | |
7071 | ||
7072 | Location loc = fn->location(); | |
7073 | ||
7074 | Function_type* orig_fntype; | |
7075 | if (fn->is_function()) | |
7076 | orig_fntype = fn->func_value()->type(); | |
7077 | else if (fn->is_function_declaration()) | |
7078 | orig_fntype = fn->func_declaration_value()->type(); | |
7079 | else | |
7080 | orig_fntype = NULL; | |
7081 | ||
7082 | if (orig_fntype == NULL || !orig_fntype->is_method()) | |
e440a328 | 7083 | { |
13f2fdb8 | 7084 | ins.first->second = |
7085 | Named_object::make_erroneous_name(gogo->thunk_name()); | |
0afbb937 | 7086 | return ins.first->second; |
e440a328 | 7087 | } |
0afbb937 | 7088 | |
7089 | Struct_field_list* sfl = new Struct_field_list(); | |
f8bdf81a | 7090 | // The type here is wrong--it should be the C function type. But it |
7091 | // doesn't really matter. | |
0afbb937 | 7092 | Type* vt = Type::make_pointer_type(Type::make_void_type()); |
13f2fdb8 | 7093 | sfl->push_back(Struct_field(Typed_identifier("fn", vt, loc))); |
7094 | sfl->push_back(Struct_field(Typed_identifier("val", | |
0afbb937 | 7095 | orig_fntype->receiver()->type(), |
7096 | loc))); | |
6bf4793c | 7097 | Struct_type* st = Type::make_struct_type(sfl, loc); |
7098 | st->set_is_struct_incomparable(); | |
7099 | Type* closure_type = Type::make_pointer_type(st); | |
0afbb937 | 7100 | |
f8bdf81a | 7101 | Function_type* new_fntype = orig_fntype->copy_with_names(); |
0afbb937 | 7102 | |
13f2fdb8 | 7103 | std::string thunk_name = gogo->thunk_name(); |
da244e59 | 7104 | Named_object* new_no = gogo->start_function(thunk_name, new_fntype, |
0afbb937 | 7105 | false, loc); |
7106 | ||
f8bdf81a | 7107 | Variable* cvar = new Variable(closure_type, NULL, false, false, false, loc); |
7108 | cvar->set_is_used(); | |
1ecc6157 | 7109 | cvar->set_is_closure(); |
da244e59 | 7110 | Named_object* cp = Named_object::make_variable("$closure" + thunk_name, |
7111 | NULL, cvar); | |
f8bdf81a | 7112 | new_no->func_value()->set_closure_var(cp); |
0afbb937 | 7113 | |
f8bdf81a | 7114 | gogo->start_block(loc); |
0afbb937 | 7115 | |
7116 | // Field 0 of the closure is the function code pointer, field 1 is | |
7117 | // the value on which to invoke the method. | |
7118 | Expression* arg = Expression::make_var_reference(cp, loc); | |
f614ea8b | 7119 | arg = Expression::make_dereference(arg, NIL_CHECK_NOT_NEEDED, loc); |
0afbb937 | 7120 | arg = Expression::make_field_reference(arg, 1, loc); |
7121 | ||
7122 | Expression* bme = Expression::make_bound_method(arg, method, fn, loc); | |
7123 | ||
7124 | const Typed_identifier_list* orig_params = orig_fntype->parameters(); | |
7125 | Expression_list* args; | |
7126 | if (orig_params == NULL || orig_params->empty()) | |
7127 | args = NULL; | |
7128 | else | |
7129 | { | |
7130 | const Typed_identifier_list* new_params = new_fntype->parameters(); | |
7131 | args = new Expression_list(); | |
7132 | for (Typed_identifier_list::const_iterator p = new_params->begin(); | |
f8bdf81a | 7133 | p != new_params->end(); |
0afbb937 | 7134 | ++p) |
7135 | { | |
7136 | Named_object* p_no = gogo->lookup(p->name(), NULL); | |
7137 | go_assert(p_no != NULL | |
7138 | && p_no->is_variable() | |
7139 | && p_no->var_value()->is_parameter()); | |
7140 | args->push_back(Expression::make_var_reference(p_no, loc)); | |
7141 | } | |
7142 | } | |
7143 | ||
7144 | Call_expression* call = Expression::make_call(bme, args, | |
7145 | orig_fntype->is_varargs(), | |
7146 | loc); | |
7147 | call->set_varargs_are_lowered(); | |
7148 | ||
7149 | Statement* s = Statement::make_return_from_call(call, loc); | |
7150 | gogo->add_statement(s); | |
7151 | Block* b = gogo->finish_block(loc); | |
7152 | gogo->add_block(b, loc); | |
7153 | gogo->lower_block(new_no, b); | |
a32698ee | 7154 | gogo->flatten_block(new_no, b); |
0afbb937 | 7155 | gogo->finish_function(loc); |
7156 | ||
7157 | ins.first->second = new_no; | |
7158 | return new_no; | |
7159 | } | |
7160 | ||
7161 | // Return an expression to check *REF for nil while dereferencing | |
7162 | // according to FIELD_INDEXES. Update *REF to build up the field | |
7163 | // reference. This is a static function so that we don't have to | |
7164 | // worry about declaring Field_indexes in expressions.h. | |
7165 | ||
7166 | static Expression* | |
7167 | bme_check_nil(const Method::Field_indexes* field_indexes, Location loc, | |
7168 | Expression** ref) | |
7169 | { | |
7170 | if (field_indexes == NULL) | |
7171 | return Expression::make_boolean(false, loc); | |
7172 | Expression* cond = bme_check_nil(field_indexes->next, loc, ref); | |
7173 | Struct_type* stype = (*ref)->type()->deref()->struct_type(); | |
7174 | go_assert(stype != NULL | |
7175 | && field_indexes->field_index < stype->field_count()); | |
7176 | if ((*ref)->type()->struct_type() == NULL) | |
7177 | { | |
7178 | go_assert((*ref)->type()->points_to() != NULL); | |
7179 | Expression* n = Expression::make_binary(OPERATOR_EQEQ, *ref, | |
7180 | Expression::make_nil(loc), | |
7181 | loc); | |
7182 | cond = Expression::make_binary(OPERATOR_OROR, cond, n, loc); | |
f614ea8b | 7183 | *ref = Expression::make_dereference(*ref, Expression::NIL_CHECK_DEFAULT, |
7184 | loc); | |
0afbb937 | 7185 | go_assert((*ref)->type()->struct_type() == stype); |
7186 | } | |
7187 | *ref = Expression::make_field_reference(*ref, field_indexes->field_index, | |
7188 | loc); | |
7189 | return cond; | |
e440a328 | 7190 | } |
7191 | ||
cd39797e | 7192 | // Flatten a method value into a struct with nil checks. We can't do |
7193 | // this in the lowering phase, because if the method value is called | |
7194 | // directly we don't need a thunk. That case will have been handled | |
7195 | // by Call_expression::do_lower, so if we get here then we do need a | |
7196 | // thunk. | |
e440a328 | 7197 | |
cd39797e | 7198 | Expression* |
7199 | Bound_method_expression::do_flatten(Gogo* gogo, Named_object*, | |
7200 | Statement_inserter* inserter) | |
e440a328 | 7201 | { |
cd39797e | 7202 | Location loc = this->location(); |
7203 | ||
7204 | Named_object* thunk = Bound_method_expression::create_thunk(gogo, | |
0afbb937 | 7205 | this->method_, |
7206 | this->function_); | |
7207 | if (thunk->is_erroneous()) | |
7208 | { | |
7209 | go_assert(saw_errors()); | |
cd39797e | 7210 | return Expression::make_error(loc); |
0afbb937 | 7211 | } |
7212 | ||
cd39797e | 7213 | // Force the expression into a variable. This is only necessary if |
7214 | // we are going to do nil checks below, but it's easy enough to | |
7215 | // always do it. | |
7216 | Expression* expr = this->expr_; | |
7217 | if (!expr->is_variable()) | |
7218 | { | |
7219 | Temporary_statement* etemp = Statement::make_temporary(NULL, expr, loc); | |
7220 | inserter->insert(etemp); | |
7221 | expr = Expression::make_temporary_reference(etemp, loc); | |
7222 | } | |
0afbb937 | 7223 | |
7224 | // If the method expects a value, and we have a pointer, we need to | |
7225 | // dereference the pointer. | |
7226 | ||
7227 | Named_object* fn = this->method_->named_object(); | |
cd39797e | 7228 | Function_type *fntype; |
0afbb937 | 7229 | if (fn->is_function()) |
7230 | fntype = fn->func_value()->type(); | |
7231 | else if (fn->is_function_declaration()) | |
7232 | fntype = fn->func_declaration_value()->type(); | |
7233 | else | |
7234 | go_unreachable(); | |
7235 | ||
cd39797e | 7236 | Expression* val = expr; |
0afbb937 | 7237 | if (fntype->receiver()->type()->points_to() == NULL |
7238 | && val->type()->points_to() != NULL) | |
f614ea8b | 7239 | val = Expression::make_dereference(val, NIL_CHECK_DEFAULT, loc); |
0afbb937 | 7240 | |
7241 | // Note that we are ignoring this->expr_type_ here. The thunk will | |
7242 | // expect a closure whose second field has type this->expr_type_ (if | |
7243 | // that is not NULL). We are going to pass it a closure whose | |
7244 | // second field has type this->expr_->type(). Since | |
7245 | // this->expr_type_ is only not-NULL for pointer types, we can get | |
7246 | // away with this. | |
7247 | ||
7248 | Struct_field_list* fields = new Struct_field_list(); | |
13f2fdb8 | 7249 | fields->push_back(Struct_field(Typed_identifier("fn", |
0afbb937 | 7250 | thunk->func_value()->type(), |
7251 | loc))); | |
13f2fdb8 | 7252 | fields->push_back(Struct_field(Typed_identifier("val", val->type(), loc))); |
0afbb937 | 7253 | Struct_type* st = Type::make_struct_type(fields, loc); |
6bf4793c | 7254 | st->set_is_struct_incomparable(); |
0afbb937 | 7255 | |
7256 | Expression_list* vals = new Expression_list(); | |
7257 | vals->push_back(Expression::make_func_code_reference(thunk, loc)); | |
7258 | vals->push_back(val); | |
7259 | ||
7260 | Expression* ret = Expression::make_struct_composite_literal(st, vals, loc); | |
c1177ba4 | 7261 | ret = Expression::make_heap_expression(ret, loc); |
0afbb937 | 7262 | |
c1177ba4 | 7263 | Node* n = Node::make_node(this); |
7264 | if ((n->encoding() & ESCAPE_MASK) == Node::ESCAPE_NONE) | |
7265 | ret->heap_expression()->set_allocate_on_stack(); | |
7266 | else if (gogo->compiling_runtime() && gogo->package_name() == "runtime") | |
7267 | go_error_at(loc, "%s escapes to heap, not allowed in runtime", | |
7268 | n->ast_format(gogo).c_str()); | |
cd39797e | 7269 | |
7270 | // If necessary, check whether the expression or any embedded | |
7271 | // pointers are nil. | |
0afbb937 | 7272 | |
df7ef1fd | 7273 | Expression* nil_check = NULL; |
0afbb937 | 7274 | if (this->method_->field_indexes() != NULL) |
7275 | { | |
0afbb937 | 7276 | Expression* ref = expr; |
7277 | nil_check = bme_check_nil(this->method_->field_indexes(), loc, &ref); | |
7278 | expr = ref; | |
7279 | } | |
7280 | ||
7281 | if (this->method_->is_value_method() && expr->type()->points_to() != NULL) | |
7282 | { | |
7283 | Expression* n = Expression::make_binary(OPERATOR_EQEQ, expr, | |
7284 | Expression::make_nil(loc), | |
7285 | loc); | |
7286 | if (nil_check == NULL) | |
7287 | nil_check = n; | |
7288 | else | |
7289 | nil_check = Expression::make_binary(OPERATOR_OROR, nil_check, n, loc); | |
7290 | } | |
7291 | ||
7292 | if (nil_check != NULL) | |
7293 | { | |
cd39797e | 7294 | Expression* crash = gogo->runtime_error(RUNTIME_ERROR_NIL_DEREFERENCE, |
7295 | loc); | |
7296 | // Fix the type of the conditional expression by pretending to | |
7297 | // evaluate to RET either way through the conditional. | |
7298 | crash = Expression::make_compound(crash, ret, loc); | |
7299 | ret = Expression::make_conditional(nil_check, crash, ret, loc); | |
7300 | } | |
7301 | ||
7302 | // RET is a pointer to a struct, but we want a function type. | |
7303 | ret = Expression::make_unsafe_cast(this->type(), ret, loc); | |
7304 | ||
7305 | return ret; | |
e440a328 | 7306 | } |
7307 | ||
d751bb78 | 7308 | // Dump ast representation of a bound method expression. |
7309 | ||
7310 | void | |
7311 | Bound_method_expression::do_dump_expression(Ast_dump_context* ast_dump_context) | |
7312 | const | |
7313 | { | |
7314 | if (this->expr_type_ != NULL) | |
7315 | ast_dump_context->ostream() << "("; | |
f03a9fbf | 7316 | ast_dump_context->dump_expression(this->expr_); |
7317 | if (this->expr_type_ != NULL) | |
d751bb78 | 7318 | { |
7319 | ast_dump_context->ostream() << ":"; | |
7320 | ast_dump_context->dump_type(this->expr_type_); | |
7321 | ast_dump_context->ostream() << ")"; | |
7322 | } | |
f03a9fbf | 7323 | |
0afbb937 | 7324 | ast_dump_context->ostream() << "." << this->function_->name(); |
d751bb78 | 7325 | } |
7326 | ||
e440a328 | 7327 | // Make a method expression. |
7328 | ||
7329 | Bound_method_expression* | |
0afbb937 | 7330 | Expression::make_bound_method(Expression* expr, const Method* method, |
7331 | Named_object* function, Location location) | |
e440a328 | 7332 | { |
0afbb937 | 7333 | return new Bound_method_expression(expr, method, function, location); |
e440a328 | 7334 | } |
7335 | ||
7336 | // Class Builtin_call_expression. This is used for a call to a | |
7337 | // builtin function. | |
7338 | ||
e440a328 | 7339 | Builtin_call_expression::Builtin_call_expression(Gogo* gogo, |
7340 | Expression* fn, | |
7341 | Expression_list* args, | |
7342 | bool is_varargs, | |
b13c66cd | 7343 | Location location) |
e440a328 | 7344 | : Call_expression(fn, args, is_varargs, location), |
6334270b | 7345 | gogo_(gogo), code_(BUILTIN_INVALID), seen_(false), |
7346 | recover_arg_is_set_(false) | |
e440a328 | 7347 | { |
7348 | Func_expression* fnexp = this->fn()->func_expression(); | |
79651b1f | 7349 | if (fnexp == NULL) |
7350 | { | |
7351 | this->code_ = BUILTIN_INVALID; | |
7352 | return; | |
7353 | } | |
e440a328 | 7354 | const std::string& name(fnexp->named_object()->name()); |
7355 | if (name == "append") | |
7356 | this->code_ = BUILTIN_APPEND; | |
7357 | else if (name == "cap") | |
7358 | this->code_ = BUILTIN_CAP; | |
7359 | else if (name == "close") | |
7360 | this->code_ = BUILTIN_CLOSE; | |
48080209 | 7361 | else if (name == "complex") |
7362 | this->code_ = BUILTIN_COMPLEX; | |
e440a328 | 7363 | else if (name == "copy") |
7364 | this->code_ = BUILTIN_COPY; | |
1cce762f | 7365 | else if (name == "delete") |
7366 | this->code_ = BUILTIN_DELETE; | |
e440a328 | 7367 | else if (name == "imag") |
7368 | this->code_ = BUILTIN_IMAG; | |
7369 | else if (name == "len") | |
7370 | this->code_ = BUILTIN_LEN; | |
7371 | else if (name == "make") | |
7372 | this->code_ = BUILTIN_MAKE; | |
7373 | else if (name == "new") | |
7374 | this->code_ = BUILTIN_NEW; | |
7375 | else if (name == "panic") | |
7376 | this->code_ = BUILTIN_PANIC; | |
7377 | else if (name == "print") | |
7378 | this->code_ = BUILTIN_PRINT; | |
7379 | else if (name == "println") | |
7380 | this->code_ = BUILTIN_PRINTLN; | |
7381 | else if (name == "real") | |
7382 | this->code_ = BUILTIN_REAL; | |
7383 | else if (name == "recover") | |
7384 | this->code_ = BUILTIN_RECOVER; | |
7385 | else if (name == "Alignof") | |
7386 | this->code_ = BUILTIN_ALIGNOF; | |
7387 | else if (name == "Offsetof") | |
7388 | this->code_ = BUILTIN_OFFSETOF; | |
7389 | else if (name == "Sizeof") | |
7390 | this->code_ = BUILTIN_SIZEOF; | |
7391 | else | |
c3e6f413 | 7392 | go_unreachable(); |
e440a328 | 7393 | } |
7394 | ||
7395 | // Return whether this is a call to recover. This is a virtual | |
7396 | // function called from the parent class. | |
7397 | ||
7398 | bool | |
7399 | Builtin_call_expression::do_is_recover_call() const | |
7400 | { | |
7401 | if (this->classification() == EXPRESSION_ERROR) | |
7402 | return false; | |
7403 | return this->code_ == BUILTIN_RECOVER; | |
7404 | } | |
7405 | ||
7406 | // Set the argument for a call to recover. | |
7407 | ||
7408 | void | |
7409 | Builtin_call_expression::do_set_recover_arg(Expression* arg) | |
7410 | { | |
7411 | const Expression_list* args = this->args(); | |
c484d925 | 7412 | go_assert(args == NULL || args->empty()); |
e440a328 | 7413 | Expression_list* new_args = new Expression_list(); |
7414 | new_args->push_back(arg); | |
7415 | this->set_args(new_args); | |
6334270b | 7416 | this->recover_arg_is_set_ = true; |
e440a328 | 7417 | } |
7418 | ||
e440a328 | 7419 | // Lower a builtin call expression. This turns new and make into |
7420 | // specific expressions. We also convert to a constant if we can. | |
7421 | ||
7422 | Expression* | |
321e5ad2 | 7423 | Builtin_call_expression::do_lower(Gogo*, Named_object* function, |
ceeb4318 | 7424 | Statement_inserter* inserter, int) |
e440a328 | 7425 | { |
79651b1f | 7426 | if (this->is_error_expression()) |
a9182619 | 7427 | return this; |
7428 | ||
b13c66cd | 7429 | Location loc = this->location(); |
1cce762f | 7430 | |
a8725655 | 7431 | if (this->is_varargs() && this->code_ != BUILTIN_APPEND) |
7432 | { | |
7433 | this->report_error(_("invalid use of %<...%> with builtin function")); | |
1cce762f | 7434 | return Expression::make_error(loc); |
a8725655 | 7435 | } |
7436 | ||
393ba00b | 7437 | if (this->code_ == BUILTIN_OFFSETOF) |
7438 | { | |
7439 | Expression* arg = this->one_arg(); | |
12e69faa | 7440 | |
7441 | if (arg->bound_method_expression() != NULL | |
7442 | || arg->interface_field_reference_expression() != NULL) | |
7443 | { | |
7444 | this->report_error(_("invalid use of method value as argument " | |
7445 | "of Offsetof")); | |
7446 | return this; | |
7447 | } | |
7448 | ||
393ba00b | 7449 | Field_reference_expression* farg = arg->field_reference_expression(); |
7450 | while (farg != NULL) | |
7451 | { | |
7452 | if (!farg->implicit()) | |
7453 | break; | |
7454 | // When the selector refers to an embedded field, | |
7455 | // it must not be reached through pointer indirections. | |
7456 | if (farg->expr()->deref() != farg->expr()) | |
7457 | { | |
12e69faa | 7458 | this->report_error(_("argument of Offsetof implies " |
7459 | "indirection of an embedded field")); | |
393ba00b | 7460 | return this; |
7461 | } | |
7462 | // Go up until we reach the original base. | |
7463 | farg = farg->expr()->field_reference_expression(); | |
7464 | } | |
7465 | } | |
f03a9fbf | 7466 | |
1cce762f | 7467 | if (this->is_constant()) |
e440a328 | 7468 | { |
0c77715b | 7469 | Numeric_constant nc; |
7470 | if (this->numeric_constant_value(&nc)) | |
7471 | return nc.expression(loc); | |
e440a328 | 7472 | } |
1cce762f | 7473 | |
7474 | switch (this->code_) | |
e440a328 | 7475 | { |
1cce762f | 7476 | default: |
7477 | break; | |
7478 | ||
7479 | case BUILTIN_NEW: | |
7480 | { | |
7481 | const Expression_list* args = this->args(); | |
7482 | if (args == NULL || args->size() < 1) | |
7483 | this->report_error(_("not enough arguments")); | |
7484 | else if (args->size() > 1) | |
7485 | this->report_error(_("too many arguments")); | |
7486 | else | |
7487 | { | |
7488 | Expression* arg = args->front(); | |
7489 | if (!arg->is_type_expression()) | |
7490 | { | |
631d5788 | 7491 | go_error_at(arg->location(), "expected type"); |
1cce762f | 7492 | this->set_is_error(); |
7493 | } | |
7494 | else | |
7495 | return Expression::make_allocation(arg->type(), loc); | |
7496 | } | |
7497 | } | |
7498 | break; | |
7499 | ||
7500 | case BUILTIN_MAKE: | |
321e5ad2 | 7501 | return this->lower_make(inserter); |
1cce762f | 7502 | |
7503 | case BUILTIN_RECOVER: | |
e440a328 | 7504 | if (function != NULL) |
7505 | function->func_value()->set_calls_recover(); | |
7506 | else | |
7507 | { | |
7508 | // Calling recover outside of a function always returns the | |
7509 | // nil empty interface. | |
823c7e3d | 7510 | Type* eface = Type::make_empty_interface_type(loc); |
1cce762f | 7511 | return Expression::make_cast(eface, Expression::make_nil(loc), loc); |
e440a328 | 7512 | } |
1cce762f | 7513 | break; |
7514 | ||
1cce762f | 7515 | case BUILTIN_DELETE: |
7516 | { | |
7517 | // Lower to a runtime function call. | |
7518 | const Expression_list* args = this->args(); | |
7519 | if (args == NULL || args->size() < 2) | |
7520 | this->report_error(_("not enough arguments")); | |
7521 | else if (args->size() > 2) | |
7522 | this->report_error(_("too many arguments")); | |
7523 | else if (args->front()->type()->map_type() == NULL) | |
7524 | this->report_error(_("argument 1 must be a map")); | |
7525 | else | |
7526 | { | |
7527 | // Since this function returns no value it must appear in | |
7528 | // a statement by itself, so we don't have to worry about | |
7529 | // order of evaluation of values around it. Evaluate the | |
7530 | // map first to get order of evaluation right. | |
7531 | Map_type* mt = args->front()->type()->map_type(); | |
7532 | Temporary_statement* map_temp = | |
7533 | Statement::make_temporary(mt, args->front(), loc); | |
7534 | inserter->insert(map_temp); | |
7535 | ||
7536 | Temporary_statement* key_temp = | |
7537 | Statement::make_temporary(mt->key_type(), args->back(), loc); | |
7538 | inserter->insert(key_temp); | |
7539 | ||
0d5530d9 | 7540 | Expression* e1 = Expression::make_type_descriptor(mt, loc); |
7541 | Expression* e2 = Expression::make_temporary_reference(map_temp, | |
1cce762f | 7542 | loc); |
0d5530d9 | 7543 | Expression* e3 = Expression::make_temporary_reference(key_temp, |
1cce762f | 7544 | loc); |
28819633 | 7545 | |
7546 | // If the call to delete is deferred, and is in a loop, | |
7547 | // then the loop will only have a single instance of the | |
7548 | // temporary variable. Passing the address of the | |
7549 | // temporary variable here means that the deferred call | |
7550 | // will see the last value in the loop, not the current | |
7551 | // value. So for this unusual case copy the value into | |
7552 | // the heap. | |
7553 | if (!this->is_deferred()) | |
7554 | e3 = Expression::make_unary(OPERATOR_AND, e3, loc); | |
7555 | else | |
7556 | { | |
7557 | Expression* a = Expression::make_allocation(mt->key_type(), | |
7558 | loc); | |
7559 | Temporary_statement* atemp = | |
7560 | Statement::make_temporary(NULL, a, loc); | |
7561 | inserter->insert(atemp); | |
7562 | ||
7563 | a = Expression::make_temporary_reference(atemp, loc); | |
7564 | a = Expression::make_dereference(a, NIL_CHECK_NOT_NEEDED, loc); | |
7565 | Statement* s = Statement::make_assignment(a, e3, loc); | |
7566 | inserter->insert(s); | |
7567 | ||
7568 | e3 = Expression::make_temporary_reference(atemp, loc); | |
7569 | } | |
7570 | ||
1cce762f | 7571 | return Runtime::make_call(Runtime::MAPDELETE, this->location(), |
0d5530d9 | 7572 | 3, e1, e2, e3); |
1cce762f | 7573 | } |
7574 | } | |
7575 | break; | |
88b03a70 | 7576 | |
7577 | case BUILTIN_PRINT: | |
7578 | case BUILTIN_PRINTLN: | |
7579 | // Force all the arguments into temporary variables, so that we | |
7580 | // don't try to evaluate something while holding the print lock. | |
7581 | if (this->args() == NULL) | |
7582 | break; | |
7583 | for (Expression_list::iterator pa = this->args()->begin(); | |
7584 | pa != this->args()->end(); | |
7585 | ++pa) | |
7586 | { | |
493ce3ee | 7587 | if (!(*pa)->is_variable() && !(*pa)->is_constant()) |
88b03a70 | 7588 | { |
7589 | Temporary_statement* temp = | |
7590 | Statement::make_temporary(NULL, *pa, loc); | |
7591 | inserter->insert(temp); | |
7592 | *pa = Expression::make_temporary_reference(temp, loc); | |
7593 | } | |
7594 | } | |
7595 | break; | |
e440a328 | 7596 | } |
7597 | ||
7598 | return this; | |
7599 | } | |
7600 | ||
35a54f17 | 7601 | // Flatten a builtin call expression. This turns the arguments of copy and |
7602 | // append into temporary expressions. | |
7603 | ||
7604 | Expression* | |
321e5ad2 | 7605 | Builtin_call_expression::do_flatten(Gogo* gogo, Named_object* function, |
35a54f17 | 7606 | Statement_inserter* inserter) |
7607 | { | |
16cb7fec | 7608 | Location loc = this->location(); |
7609 | ||
7610 | switch (this->code_) | |
35a54f17 | 7611 | { |
16cb7fec | 7612 | default: |
7613 | break; | |
7614 | ||
7615 | case BUILTIN_APPEND: | |
d3c55148 | 7616 | return this->flatten_append(gogo, function, inserter, NULL, NULL); |
321e5ad2 | 7617 | |
16cb7fec | 7618 | case BUILTIN_COPY: |
7619 | { | |
7620 | Type* at = this->args()->front()->type(); | |
7621 | for (Expression_list::iterator pa = this->args()->begin(); | |
7622 | pa != this->args()->end(); | |
7623 | ++pa) | |
7624 | { | |
7625 | if ((*pa)->is_nil_expression()) | |
7626 | { | |
7627 | Expression* nil = Expression::make_nil(loc); | |
7628 | Expression* zero = Expression::make_integer_ul(0, NULL, loc); | |
7629 | *pa = Expression::make_slice_value(at, nil, zero, zero, loc); | |
7630 | } | |
7631 | if (!(*pa)->is_variable()) | |
7632 | { | |
7633 | Temporary_statement* temp = | |
7634 | Statement::make_temporary(NULL, *pa, loc); | |
7635 | inserter->insert(temp); | |
7636 | *pa = Expression::make_temporary_reference(temp, loc); | |
7637 | } | |
7638 | } | |
7639 | } | |
7640 | break; | |
7641 | ||
7642 | case BUILTIN_PANIC: | |
35a54f17 | 7643 | for (Expression_list::iterator pa = this->args()->begin(); |
16cb7fec | 7644 | pa != this->args()->end(); |
7645 | ++pa) | |
7646 | { | |
7647 | if (!(*pa)->is_variable() && (*pa)->type()->interface_type() != NULL) | |
55e8ba6a | 7648 | { |
16cb7fec | 7649 | Temporary_statement* temp = |
7650 | Statement::make_temporary(NULL, *pa, loc); | |
7651 | inserter->insert(temp); | |
7652 | *pa = Expression::make_temporary_reference(temp, loc); | |
55e8ba6a | 7653 | } |
16cb7fec | 7654 | } |
7739537f | 7655 | break; |
0d5530d9 | 7656 | |
7657 | case BUILTIN_LEN: | |
132ed071 | 7658 | case BUILTIN_CAP: |
321e5ad2 | 7659 | { |
7660 | Expression_list::iterator pa = this->args()->begin(); | |
7661 | if (!(*pa)->is_variable() | |
7662 | && ((*pa)->type()->map_type() != NULL | |
7663 | || (*pa)->type()->channel_type() != NULL)) | |
7664 | { | |
7665 | Temporary_statement* temp = | |
7666 | Statement::make_temporary(NULL, *pa, loc); | |
7667 | inserter->insert(temp); | |
7668 | *pa = Expression::make_temporary_reference(temp, loc); | |
7669 | } | |
7670 | } | |
7671 | break; | |
35a54f17 | 7672 | } |
16cb7fec | 7673 | |
35a54f17 | 7674 | return this; |
7675 | } | |
7676 | ||
a9182619 | 7677 | // Lower a make expression. |
7678 | ||
7679 | Expression* | |
321e5ad2 | 7680 | Builtin_call_expression::lower_make(Statement_inserter* inserter) |
a9182619 | 7681 | { |
b13c66cd | 7682 | Location loc = this->location(); |
a9182619 | 7683 | |
7684 | const Expression_list* args = this->args(); | |
7685 | if (args == NULL || args->size() < 1) | |
7686 | { | |
7687 | this->report_error(_("not enough arguments")); | |
7688 | return Expression::make_error(this->location()); | |
7689 | } | |
7690 | ||
7691 | Expression_list::const_iterator parg = args->begin(); | |
7692 | ||
7693 | Expression* first_arg = *parg; | |
7694 | if (!first_arg->is_type_expression()) | |
7695 | { | |
631d5788 | 7696 | go_error_at(first_arg->location(), "expected type"); |
a9182619 | 7697 | this->set_is_error(); |
7698 | return Expression::make_error(this->location()); | |
7699 | } | |
7700 | Type* type = first_arg->type(); | |
7701 | ||
22deed0d | 7702 | if (!type->in_heap()) |
7703 | go_error_at(first_arg->location(), | |
7704 | "can't make slice of go:notinheap type"); | |
7705 | ||
a9182619 | 7706 | bool is_slice = false; |
7707 | bool is_map = false; | |
7708 | bool is_chan = false; | |
411eb89e | 7709 | if (type->is_slice_type()) |
a9182619 | 7710 | is_slice = true; |
7711 | else if (type->map_type() != NULL) | |
7712 | is_map = true; | |
7713 | else if (type->channel_type() != NULL) | |
7714 | is_chan = true; | |
7715 | else | |
7716 | { | |
7717 | this->report_error(_("invalid type for make function")); | |
7718 | return Expression::make_error(this->location()); | |
7719 | } | |
7720 | ||
f6bc81e6 | 7721 | Type_context int_context(Type::lookup_integer_type("int"), false); |
7722 | ||
a9182619 | 7723 | ++parg; |
7724 | Expression* len_arg; | |
ccea2b36 | 7725 | bool len_small = false; |
a9182619 | 7726 | if (parg == args->end()) |
7727 | { | |
7728 | if (is_slice) | |
7729 | { | |
7730 | this->report_error(_("length required when allocating a slice")); | |
7731 | return Expression::make_error(this->location()); | |
7732 | } | |
e67508fa | 7733 | len_arg = Expression::make_integer_ul(0, NULL, loc); |
33d1d391 | 7734 | len_small = true; |
a9182619 | 7735 | } |
7736 | else | |
7737 | { | |
7738 | len_arg = *parg; | |
f6bc81e6 | 7739 | len_arg->determine_type(&int_context); |
a065edc5 | 7740 | if (len_arg->type()->integer_type() == NULL) |
7741 | { | |
7742 | go_error_at(len_arg->location(), "non-integer len argument in make"); | |
7743 | return Expression::make_error(this->location()); | |
7744 | } | |
ccea2b36 | 7745 | if (!this->check_int_value(len_arg, true, &len_small)) |
1ad00fd4 | 7746 | return Expression::make_error(this->location()); |
a9182619 | 7747 | ++parg; |
7748 | } | |
7749 | ||
7750 | Expression* cap_arg = NULL; | |
ccea2b36 | 7751 | bool cap_small = false; |
72bf0e6e | 7752 | Numeric_constant nclen; |
7753 | Numeric_constant nccap; | |
7754 | unsigned long vlen; | |
7755 | unsigned long vcap; | |
a9182619 | 7756 | if (is_slice && parg != args->end()) |
7757 | { | |
7758 | cap_arg = *parg; | |
f6bc81e6 | 7759 | cap_arg->determine_type(&int_context); |
a065edc5 | 7760 | if (cap_arg->type()->integer_type() == NULL) |
7761 | { | |
7762 | go_error_at(cap_arg->location(), "non-integer cap argument in make"); | |
7763 | return Expression::make_error(this->location()); | |
7764 | } | |
ccea2b36 | 7765 | if (!this->check_int_value(cap_arg, false, &cap_small)) |
1ad00fd4 | 7766 | return Expression::make_error(this->location()); |
7767 | ||
1ad00fd4 | 7768 | if (len_arg->numeric_constant_value(&nclen) |
7769 | && cap_arg->numeric_constant_value(&nccap) | |
7770 | && nclen.to_unsigned_long(&vlen) == Numeric_constant::NC_UL_VALID | |
7771 | && nccap.to_unsigned_long(&vcap) == Numeric_constant::NC_UL_VALID | |
7772 | && vlen > vcap) | |
a9182619 | 7773 | { |
1ad00fd4 | 7774 | this->report_error(_("len larger than cap")); |
a9182619 | 7775 | return Expression::make_error(this->location()); |
7776 | } | |
1ad00fd4 | 7777 | |
a9182619 | 7778 | ++parg; |
7779 | } | |
7780 | ||
7781 | if (parg != args->end()) | |
7782 | { | |
7783 | this->report_error(_("too many arguments to make")); | |
7784 | return Expression::make_error(this->location()); | |
7785 | } | |
7786 | ||
b13c66cd | 7787 | Location type_loc = first_arg->location(); |
a9182619 | 7788 | |
7789 | Expression* call; | |
7790 | if (is_slice) | |
7791 | { | |
d633d0fb | 7792 | Temporary_statement* len_temp = NULL; |
7793 | if (!len_arg->is_constant()) | |
7794 | { | |
7795 | len_temp = Statement::make_temporary(NULL, len_arg, loc); | |
7796 | inserter->insert(len_temp); | |
7797 | len_arg = Expression::make_temporary_reference(len_temp, loc); | |
7798 | } | |
7799 | ||
a9182619 | 7800 | if (cap_arg == NULL) |
321e5ad2 | 7801 | { |
72bf0e6e | 7802 | cap_small = len_small; |
d633d0fb | 7803 | if (len_temp == NULL) |
7804 | cap_arg = len_arg->copy(); | |
7805 | else | |
7806 | cap_arg = Expression::make_temporary_reference(len_temp, loc); | |
7807 | } | |
7808 | else if (!cap_arg->is_constant()) | |
7809 | { | |
7810 | Temporary_statement* cap_temp = Statement::make_temporary(NULL, | |
7811 | cap_arg, | |
7812 | loc); | |
7813 | inserter->insert(cap_temp); | |
7814 | cap_arg = Expression::make_temporary_reference(cap_temp, loc); | |
321e5ad2 | 7815 | } |
ccea2b36 | 7816 | |
72bf0e6e | 7817 | Type* et = type->array_type()->element_type(); |
7818 | Expression* type_arg = Expression::make_type_descriptor(et, type_loc); | |
ccea2b36 | 7819 | Runtime::Function code = Runtime::MAKESLICE; |
7820 | if (!len_small || !cap_small) | |
7821 | code = Runtime::MAKESLICE64; | |
d633d0fb | 7822 | Expression* mem = Runtime::make_call(code, loc, 3, type_arg, len_arg, |
7823 | cap_arg); | |
7824 | mem = Expression::make_unsafe_cast(Type::make_pointer_type(et), mem, | |
7825 | loc); | |
f81232c1 | 7826 | Type* int_type = Type::lookup_integer_type("int"); |
7827 | len_arg = Expression::make_cast(int_type, len_arg->copy(), loc); | |
7828 | cap_arg = Expression::make_cast(int_type, cap_arg->copy(), loc); | |
7829 | call = Expression::make_slice_value(type, mem, len_arg, cap_arg, loc); | |
a9182619 | 7830 | } |
7831 | else if (is_map) | |
321e5ad2 | 7832 | { |
7833 | Expression* type_arg = Expression::make_type_descriptor(type, type_loc); | |
33d1d391 | 7834 | if (!len_small) |
7835 | call = Runtime::make_call(Runtime::MAKEMAP64, loc, 3, type_arg, | |
7836 | len_arg, | |
7837 | Expression::make_nil(loc)); | |
7838 | else | |
7839 | { | |
7840 | Numeric_constant nclen; | |
7841 | unsigned long vlen; | |
7842 | if (len_arg->numeric_constant_value(&nclen) | |
7843 | && nclen.to_unsigned_long(&vlen) == Numeric_constant::NC_UL_VALID | |
7844 | && vlen <= Map_type::bucket_size) | |
7845 | call = Runtime::make_call(Runtime::MAKEMAP_SMALL, loc, 0); | |
7846 | else | |
7847 | call = Runtime::make_call(Runtime::MAKEMAP, loc, 3, type_arg, | |
7848 | len_arg, | |
7849 | Expression::make_nil(loc)); | |
7850 | } | |
321e5ad2 | 7851 | } |
a9182619 | 7852 | else if (is_chan) |
321e5ad2 | 7853 | { |
7854 | Expression* type_arg = Expression::make_type_descriptor(type, type_loc); | |
1423c90a | 7855 | Runtime::Function code = Runtime::MAKECHAN; |
7856 | if (!len_small) | |
7857 | code = Runtime::MAKECHAN64; | |
7858 | call = Runtime::make_call(code, loc, 2, type_arg, len_arg); | |
321e5ad2 | 7859 | } |
a9182619 | 7860 | else |
7861 | go_unreachable(); | |
7862 | ||
7863 | return Expression::make_unsafe_cast(type, call, loc); | |
7864 | } | |
7865 | ||
321e5ad2 | 7866 | // Flatten a call to the predeclared append function. We do this in |
7867 | // the flatten phase, not the lowering phase, so that we run after | |
d3c55148 | 7868 | // type checking and after order_evaluations. If ASSIGN_LHS is not |
7869 | // NULL, this append is the right-hand-side of an assignment and | |
7870 | // ASSIGN_LHS is the left-hand-side; in that case, set LHS directly | |
7871 | // rather than returning a slice. This lets us omit a write barrier | |
7872 | // in common cases like a = append(a, ...) when the slice does not | |
7873 | // need to grow. ENCLOSING is not NULL iff ASSIGN_LHS is not NULL. | |
321e5ad2 | 7874 | |
7875 | Expression* | |
7876 | Builtin_call_expression::flatten_append(Gogo* gogo, Named_object* function, | |
d3c55148 | 7877 | Statement_inserter* inserter, |
7878 | Expression* assign_lhs, | |
7879 | Block* enclosing) | |
321e5ad2 | 7880 | { |
7881 | if (this->is_error_expression()) | |
7882 | return this; | |
7883 | ||
7884 | Location loc = this->location(); | |
7885 | ||
7886 | const Expression_list* args = this->args(); | |
7887 | go_assert(args != NULL && !args->empty()); | |
7888 | ||
7889 | Type* slice_type = args->front()->type(); | |
7890 | go_assert(slice_type->is_slice_type()); | |
7891 | Type* element_type = slice_type->array_type()->element_type(); | |
7892 | ||
7893 | if (args->size() == 1) | |
7894 | { | |
7895 | // append(s) evaluates to s. | |
d3c55148 | 7896 | if (assign_lhs != NULL) |
7897 | return NULL; | |
321e5ad2 | 7898 | return args->front(); |
7899 | } | |
7900 | ||
7901 | Type* int_type = Type::lookup_integer_type("int"); | |
7902 | Type* uint_type = Type::lookup_integer_type("uint"); | |
7903 | ||
7904 | // Implementing | |
7905 | // append(s1, s2...) | |
7906 | // or | |
7907 | // append(s1, a1, a2, a3, ...) | |
7908 | ||
7909 | // s1tmp := s1 | |
7910 | Temporary_statement* s1tmp = Statement::make_temporary(NULL, args->front(), | |
7911 | loc); | |
7912 | inserter->insert(s1tmp); | |
7913 | ||
7914 | // l1tmp := len(s1tmp) | |
7915 | Named_object* lenfn = gogo->lookup_global("len"); | |
7916 | Expression* lenref = Expression::make_func_reference(lenfn, NULL, loc); | |
7917 | Expression_list* call_args = new Expression_list(); | |
7918 | call_args->push_back(Expression::make_temporary_reference(s1tmp, loc)); | |
7919 | Expression* len = Expression::make_call(lenref, call_args, false, loc); | |
7920 | gogo->lower_expression(function, inserter, &len); | |
7921 | gogo->flatten_expression(function, inserter, &len); | |
7922 | Temporary_statement* l1tmp = Statement::make_temporary(int_type, len, loc); | |
7923 | inserter->insert(l1tmp); | |
7924 | ||
7925 | Temporary_statement* s2tmp = NULL; | |
7926 | Temporary_statement* l2tmp = NULL; | |
7927 | Expression_list* add = NULL; | |
7928 | Expression* len2; | |
7929 | if (this->is_varargs()) | |
7930 | { | |
7931 | go_assert(args->size() == 2); | |
7932 | ||
7933 | // s2tmp := s2 | |
7934 | s2tmp = Statement::make_temporary(NULL, args->back(), loc); | |
7935 | inserter->insert(s2tmp); | |
7936 | ||
7937 | // l2tmp := len(s2tmp) | |
7938 | lenref = Expression::make_func_reference(lenfn, NULL, loc); | |
7939 | call_args = new Expression_list(); | |
7940 | call_args->push_back(Expression::make_temporary_reference(s2tmp, loc)); | |
7941 | len = Expression::make_call(lenref, call_args, false, loc); | |
7942 | gogo->lower_expression(function, inserter, &len); | |
7943 | gogo->flatten_expression(function, inserter, &len); | |
7944 | l2tmp = Statement::make_temporary(int_type, len, loc); | |
7945 | inserter->insert(l2tmp); | |
7946 | ||
7947 | // len2 = l2tmp | |
7948 | len2 = Expression::make_temporary_reference(l2tmp, loc); | |
7949 | } | |
7950 | else | |
7951 | { | |
7952 | // We have to ensure that all the arguments are in variables | |
7953 | // now, because otherwise if one of them is an index expression | |
7954 | // into the current slice we could overwrite it before we fetch | |
7955 | // it. | |
7956 | add = new Expression_list(); | |
7957 | Expression_list::const_iterator pa = args->begin(); | |
7958 | for (++pa; pa != args->end(); ++pa) | |
7959 | { | |
7960 | if ((*pa)->is_variable()) | |
7961 | add->push_back(*pa); | |
7962 | else | |
7963 | { | |
7964 | Temporary_statement* tmp = Statement::make_temporary(NULL, *pa, | |
7965 | loc); | |
7966 | inserter->insert(tmp); | |
7967 | add->push_back(Expression::make_temporary_reference(tmp, loc)); | |
7968 | } | |
7969 | } | |
7970 | ||
7971 | // len2 = len(add) | |
7972 | len2 = Expression::make_integer_ul(add->size(), int_type, loc); | |
7973 | } | |
7974 | ||
7975 | // ntmp := l1tmp + len2 | |
7976 | Expression* ref = Expression::make_temporary_reference(l1tmp, loc); | |
7977 | Expression* sum = Expression::make_binary(OPERATOR_PLUS, ref, len2, loc); | |
7978 | gogo->lower_expression(function, inserter, &sum); | |
7979 | gogo->flatten_expression(function, inserter, &sum); | |
7980 | Temporary_statement* ntmp = Statement::make_temporary(int_type, sum, loc); | |
7981 | inserter->insert(ntmp); | |
7982 | ||
7983 | // s1tmp = uint(ntmp) > uint(cap(s1tmp)) ? | |
7984 | // growslice(type, s1tmp, ntmp) : | |
7985 | // s1tmp[:ntmp] | |
7986 | // Using uint here means that if the computation of ntmp overflowed, | |
7987 | // we will call growslice which will panic. | |
7988 | ||
7989 | Expression* left = Expression::make_temporary_reference(ntmp, loc); | |
7990 | left = Expression::make_cast(uint_type, left, loc); | |
7991 | ||
7992 | Named_object* capfn = gogo->lookup_global("cap"); | |
7993 | Expression* capref = Expression::make_func_reference(capfn, NULL, loc); | |
7994 | call_args = new Expression_list(); | |
7995 | call_args->push_back(Expression::make_temporary_reference(s1tmp, loc)); | |
7996 | Expression* right = Expression::make_call(capref, call_args, false, loc); | |
7997 | right = Expression::make_cast(uint_type, right, loc); | |
7998 | ||
7999 | Expression* cond = Expression::make_binary(OPERATOR_GT, left, right, loc); | |
8000 | ||
8001 | Expression* a1 = Expression::make_type_descriptor(element_type, loc); | |
8002 | Expression* a2 = Expression::make_temporary_reference(s1tmp, loc); | |
8003 | Expression* a3 = Expression::make_temporary_reference(ntmp, loc); | |
8004 | Expression* call = Runtime::make_call(Runtime::GROWSLICE, loc, 3, | |
8005 | a1, a2, a3); | |
8006 | call = Expression::make_unsafe_cast(slice_type, call, loc); | |
8007 | ||
8008 | ref = Expression::make_temporary_reference(s1tmp, loc); | |
8009 | Expression* zero = Expression::make_integer_ul(0, int_type, loc); | |
8010 | Expression* ref2 = Expression::make_temporary_reference(ntmp, loc); | |
3d135120 | 8011 | ref = Expression::make_array_index(ref, zero, ref2, NULL, loc); |
8012 | ref->array_index_expression()->set_needs_bounds_check(false); | |
321e5ad2 | 8013 | |
d3c55148 | 8014 | if (assign_lhs == NULL) |
8015 | { | |
8016 | Expression* rhs = Expression::make_conditional(cond, call, ref, loc); | |
8017 | ||
8018 | gogo->lower_expression(function, inserter, &rhs); | |
8019 | gogo->flatten_expression(function, inserter, &rhs); | |
8020 | ||
8021 | ref = Expression::make_temporary_reference(s1tmp, loc); | |
8022 | Statement* assign = Statement::make_assignment(ref, rhs, loc); | |
8023 | inserter->insert(assign); | |
8024 | } | |
8025 | else | |
8026 | { | |
8027 | gogo->lower_expression(function, inserter, &cond); | |
8028 | gogo->flatten_expression(function, inserter, &cond); | |
8029 | gogo->lower_expression(function, inserter, &call); | |
8030 | gogo->flatten_expression(function, inserter, &call); | |
8031 | gogo->lower_expression(function, inserter, &ref); | |
8032 | gogo->flatten_expression(function, inserter, &ref); | |
8033 | ||
8034 | Block* then_block = new Block(enclosing, loc); | |
8035 | Assignment_statement* assign = | |
8036 | Statement::make_assignment(assign_lhs, call, loc); | |
8037 | then_block->add_statement(assign); | |
321e5ad2 | 8038 | |
d3c55148 | 8039 | Block* else_block = new Block(enclosing, loc); |
8040 | assign = Statement::make_assignment(assign_lhs->copy(), ref, loc); | |
8041 | // This assignment will not change the pointer value, so it does | |
8042 | // not need a write barrier. | |
8043 | assign->set_omit_write_barrier(); | |
8044 | else_block->add_statement(assign); | |
321e5ad2 | 8045 | |
d3c55148 | 8046 | Statement* s = Statement::make_if_statement(cond, then_block, |
8047 | else_block, loc); | |
8048 | inserter->insert(s); | |
8049 | ||
8050 | ref = Expression::make_temporary_reference(s1tmp, loc); | |
8051 | assign = Statement::make_assignment(ref, assign_lhs->copy(), loc); | |
8052 | inserter->insert(assign); | |
8053 | } | |
321e5ad2 | 8054 | |
8055 | if (this->is_varargs()) | |
8056 | { | |
8057 | // copy(s1tmp[l1tmp:], s2tmp) | |
8058 | a1 = Expression::make_temporary_reference(s1tmp, loc); | |
8059 | ref = Expression::make_temporary_reference(l1tmp, loc); | |
8060 | Expression* nil = Expression::make_nil(loc); | |
3d135120 | 8061 | a1 = Expression::make_array_index(a1, ref, nil, NULL, loc); |
8062 | a1->array_index_expression()->set_needs_bounds_check(false); | |
321e5ad2 | 8063 | |
8064 | a2 = Expression::make_temporary_reference(s2tmp, loc); | |
8065 | ||
8066 | Named_object* copyfn = gogo->lookup_global("copy"); | |
8067 | Expression* copyref = Expression::make_func_reference(copyfn, NULL, loc); | |
8068 | call_args = new Expression_list(); | |
8069 | call_args->push_back(a1); | |
8070 | call_args->push_back(a2); | |
8071 | call = Expression::make_call(copyref, call_args, false, loc); | |
8072 | gogo->lower_expression(function, inserter, &call); | |
8073 | gogo->flatten_expression(function, inserter, &call); | |
8074 | inserter->insert(Statement::make_statement(call, false)); | |
8075 | } | |
8076 | else | |
8077 | { | |
8078 | // For each argument: | |
8079 | // s1tmp[l1tmp+i] = a | |
8080 | unsigned long i = 0; | |
8081 | for (Expression_list::const_iterator pa = add->begin(); | |
8082 | pa != add->end(); | |
8083 | ++pa, ++i) | |
8084 | { | |
8085 | ref = Expression::make_temporary_reference(s1tmp, loc); | |
8086 | ref2 = Expression::make_temporary_reference(l1tmp, loc); | |
8087 | Expression* off = Expression::make_integer_ul(i, int_type, loc); | |
8088 | ref2 = Expression::make_binary(OPERATOR_PLUS, ref2, off, loc); | |
3d135120 | 8089 | Expression* lhs = Expression::make_array_index(ref, ref2, NULL, |
8090 | NULL, loc); | |
8091 | lhs->array_index_expression()->set_needs_bounds_check(false); | |
321e5ad2 | 8092 | gogo->lower_expression(function, inserter, &lhs); |
8093 | gogo->flatten_expression(function, inserter, &lhs); | |
03118c21 | 8094 | // The flatten pass runs after the write barrier pass, so we |
8095 | // need to insert a write barrier here if necessary. | |
d3c55148 | 8096 | // However, if ASSIGN_LHS is not NULL, we have been called |
8097 | // directly before the write barrier pass. | |
8098 | Statement* assign; | |
8099 | if (assign_lhs != NULL | |
8100 | || !gogo->assign_needs_write_barrier(lhs)) | |
03118c21 | 8101 | assign = Statement::make_assignment(lhs, *pa, loc); |
8102 | else | |
8103 | { | |
8104 | Function* f = function == NULL ? NULL : function->func_value(); | |
8105 | assign = gogo->assign_with_write_barrier(f, NULL, inserter, | |
8106 | lhs, *pa, loc); | |
8107 | } | |
321e5ad2 | 8108 | inserter->insert(assign); |
8109 | } | |
8110 | } | |
8111 | ||
d3c55148 | 8112 | if (assign_lhs != NULL) |
8113 | return NULL; | |
8114 | ||
321e5ad2 | 8115 | return Expression::make_temporary_reference(s1tmp, loc); |
8116 | } | |
8117 | ||
a9182619 | 8118 | // Return whether an expression has an integer value. Report an error |
8119 | // if not. This is used when handling calls to the predeclared make | |
ccea2b36 | 8120 | // function. Set *SMALL if the value is known to fit in type "int". |
a9182619 | 8121 | |
8122 | bool | |
ccea2b36 | 8123 | Builtin_call_expression::check_int_value(Expression* e, bool is_length, |
8124 | bool *small) | |
a9182619 | 8125 | { |
ccea2b36 | 8126 | *small = false; |
8127 | ||
0c77715b | 8128 | Numeric_constant nc; |
1ad00fd4 | 8129 | if (e->numeric_constant_value(&nc)) |
a9182619 | 8130 | { |
1ad00fd4 | 8131 | unsigned long v; |
8132 | switch (nc.to_unsigned_long(&v)) | |
8133 | { | |
8134 | case Numeric_constant::NC_UL_VALID: | |
1b10c5e7 | 8135 | break; |
1ad00fd4 | 8136 | case Numeric_constant::NC_UL_NOTINT: |
631d5788 | 8137 | go_error_at(e->location(), "non-integer %s argument to make", |
8138 | is_length ? "len" : "cap"); | |
1ad00fd4 | 8139 | return false; |
8140 | case Numeric_constant::NC_UL_NEGATIVE: | |
631d5788 | 8141 | go_error_at(e->location(), "negative %s argument to make", |
8142 | is_length ? "len" : "cap"); | |
1ad00fd4 | 8143 | return false; |
8144 | case Numeric_constant::NC_UL_BIG: | |
8145 | // We don't want to give a compile-time error for a 64-bit | |
8146 | // value on a 32-bit target. | |
1b10c5e7 | 8147 | break; |
1ad00fd4 | 8148 | } |
1b10c5e7 | 8149 | |
8150 | mpz_t val; | |
8151 | if (!nc.to_int(&val)) | |
8152 | go_unreachable(); | |
8153 | int bits = mpz_sizeinbase(val, 2); | |
8154 | mpz_clear(val); | |
8155 | Type* int_type = Type::lookup_integer_type("int"); | |
8156 | if (bits >= int_type->integer_type()->bits()) | |
8157 | { | |
631d5788 | 8158 | go_error_at(e->location(), "%s argument too large for make", |
8159 | is_length ? "len" : "cap"); | |
1b10c5e7 | 8160 | return false; |
8161 | } | |
8162 | ||
ccea2b36 | 8163 | *small = true; |
1b10c5e7 | 8164 | return true; |
a9182619 | 8165 | } |
8166 | ||
1ad00fd4 | 8167 | if (e->type()->integer_type() != NULL) |
ccea2b36 | 8168 | { |
8169 | int ebits = e->type()->integer_type()->bits(); | |
8170 | int intbits = Type::lookup_integer_type("int")->integer_type()->bits(); | |
8171 | ||
8172 | // We can treat ebits == intbits as small even for an unsigned | |
8173 | // integer type, because we will convert the value to int and | |
8174 | // then reject it in the runtime if it is negative. | |
8175 | *small = ebits <= intbits; | |
8176 | ||
8177 | return true; | |
8178 | } | |
1ad00fd4 | 8179 | |
631d5788 | 8180 | go_error_at(e->location(), "non-integer %s argument to make", |
8181 | is_length ? "len" : "cap"); | |
a9182619 | 8182 | return false; |
8183 | } | |
8184 | ||
e440a328 | 8185 | // Return the type of the real or imag functions, given the type of |
fcbea5e4 | 8186 | // the argument. We need to map complex64 to float32 and complex128 |
8187 | // to float64, so it has to be done by name. This returns NULL if it | |
8188 | // can't figure out the type. | |
e440a328 | 8189 | |
8190 | Type* | |
8191 | Builtin_call_expression::real_imag_type(Type* arg_type) | |
8192 | { | |
8193 | if (arg_type == NULL || arg_type->is_abstract()) | |
8194 | return NULL; | |
8195 | Named_type* nt = arg_type->named_type(); | |
8196 | if (nt == NULL) | |
8197 | return NULL; | |
8198 | while (nt->real_type()->named_type() != NULL) | |
8199 | nt = nt->real_type()->named_type(); | |
48080209 | 8200 | if (nt->name() == "complex64") |
e440a328 | 8201 | return Type::lookup_float_type("float32"); |
8202 | else if (nt->name() == "complex128") | |
8203 | return Type::lookup_float_type("float64"); | |
8204 | else | |
8205 | return NULL; | |
8206 | } | |
8207 | ||
48080209 | 8208 | // Return the type of the complex function, given the type of one of the |
e440a328 | 8209 | // argments. Like real_imag_type, we have to map by name. |
8210 | ||
8211 | Type* | |
48080209 | 8212 | Builtin_call_expression::complex_type(Type* arg_type) |
e440a328 | 8213 | { |
8214 | if (arg_type == NULL || arg_type->is_abstract()) | |
8215 | return NULL; | |
8216 | Named_type* nt = arg_type->named_type(); | |
8217 | if (nt == NULL) | |
8218 | return NULL; | |
8219 | while (nt->real_type()->named_type() != NULL) | |
8220 | nt = nt->real_type()->named_type(); | |
48080209 | 8221 | if (nt->name() == "float32") |
e440a328 | 8222 | return Type::lookup_complex_type("complex64"); |
8223 | else if (nt->name() == "float64") | |
8224 | return Type::lookup_complex_type("complex128"); | |
8225 | else | |
8226 | return NULL; | |
8227 | } | |
8228 | ||
8229 | // Return a single argument, or NULL if there isn't one. | |
8230 | ||
8231 | Expression* | |
8232 | Builtin_call_expression::one_arg() const | |
8233 | { | |
8234 | const Expression_list* args = this->args(); | |
aa615cb3 | 8235 | if (args == NULL || args->size() != 1) |
e440a328 | 8236 | return NULL; |
8237 | return args->front(); | |
8238 | } | |
8239 | ||
83921647 | 8240 | // A traversal class which looks for a call or receive expression. |
8241 | ||
8242 | class Find_call_expression : public Traverse | |
8243 | { | |
8244 | public: | |
8245 | Find_call_expression() | |
8246 | : Traverse(traverse_expressions), | |
8247 | found_(false) | |
8248 | { } | |
8249 | ||
8250 | int | |
8251 | expression(Expression**); | |
8252 | ||
8253 | bool | |
8254 | found() | |
8255 | { return this->found_; } | |
8256 | ||
8257 | private: | |
8258 | bool found_; | |
8259 | }; | |
8260 | ||
8261 | int | |
8262 | Find_call_expression::expression(Expression** pexpr) | |
8263 | { | |
4714afb2 | 8264 | Expression* expr = *pexpr; |
8265 | if (!expr->is_constant() | |
8266 | && (expr->call_expression() != NULL | |
8267 | || expr->receive_expression() != NULL)) | |
83921647 | 8268 | { |
8269 | this->found_ = true; | |
8270 | return TRAVERSE_EXIT; | |
8271 | } | |
8272 | return TRAVERSE_CONTINUE; | |
8273 | } | |
8274 | ||
4714afb2 | 8275 | // Return whether calling len or cap on EXPR, of array type, is a |
8276 | // constant. The language spec says "the expressions len(s) and | |
8277 | // cap(s) are constants if the type of s is an array or pointer to an | |
8278 | // array and the expression s does not contain channel receives or | |
8279 | // (non-constant) function calls." | |
8280 | ||
8281 | bool | |
8282 | Builtin_call_expression::array_len_is_constant(Expression* expr) | |
8283 | { | |
8284 | go_assert(expr->type()->deref()->array_type() != NULL | |
8285 | && !expr->type()->deref()->is_slice_type()); | |
8286 | if (expr->is_constant()) | |
8287 | return true; | |
8288 | Find_call_expression find_call; | |
8289 | Expression::traverse(&expr, &find_call); | |
8290 | return !find_call.found(); | |
8291 | } | |
8292 | ||
83921647 | 8293 | // Return whether this is constant: len of a string constant, or len |
8294 | // or cap of an array, or unsafe.Sizeof, unsafe.Offsetof, | |
8295 | // unsafe.Alignof. | |
e440a328 | 8296 | |
8297 | bool | |
8298 | Builtin_call_expression::do_is_constant() const | |
8299 | { | |
12e69faa | 8300 | if (this->is_error_expression()) |
8301 | return true; | |
e440a328 | 8302 | switch (this->code_) |
8303 | { | |
8304 | case BUILTIN_LEN: | |
8305 | case BUILTIN_CAP: | |
8306 | { | |
0f914071 | 8307 | if (this->seen_) |
8308 | return false; | |
8309 | ||
e440a328 | 8310 | Expression* arg = this->one_arg(); |
8311 | if (arg == NULL) | |
8312 | return false; | |
8313 | Type* arg_type = arg->type(); | |
8314 | ||
8315 | if (arg_type->points_to() != NULL | |
8316 | && arg_type->points_to()->array_type() != NULL | |
411eb89e | 8317 | && !arg_type->points_to()->is_slice_type()) |
e440a328 | 8318 | arg_type = arg_type->points_to(); |
8319 | ||
8320 | if (arg_type->array_type() != NULL | |
54934d77 | 8321 | && arg_type->array_type()->length() != NULL) |
8322 | { | |
8323 | this->seen_ = true; | |
8324 | bool ret = Builtin_call_expression::array_len_is_constant(arg); | |
8325 | this->seen_ = false; | |
8326 | return ret; | |
8327 | } | |
e440a328 | 8328 | |
8329 | if (this->code_ == BUILTIN_LEN && arg_type->is_string_type()) | |
0f914071 | 8330 | { |
8331 | this->seen_ = true; | |
8332 | bool ret = arg->is_constant(); | |
8333 | this->seen_ = false; | |
8334 | return ret; | |
8335 | } | |
e440a328 | 8336 | } |
8337 | break; | |
8338 | ||
8339 | case BUILTIN_SIZEOF: | |
8340 | case BUILTIN_ALIGNOF: | |
8341 | return this->one_arg() != NULL; | |
8342 | ||
8343 | case BUILTIN_OFFSETOF: | |
8344 | { | |
8345 | Expression* arg = this->one_arg(); | |
8346 | if (arg == NULL) | |
8347 | return false; | |
8348 | return arg->field_reference_expression() != NULL; | |
8349 | } | |
8350 | ||
48080209 | 8351 | case BUILTIN_COMPLEX: |
e440a328 | 8352 | { |
8353 | const Expression_list* args = this->args(); | |
8354 | if (args != NULL && args->size() == 2) | |
8355 | return args->front()->is_constant() && args->back()->is_constant(); | |
8356 | } | |
8357 | break; | |
8358 | ||
8359 | case BUILTIN_REAL: | |
8360 | case BUILTIN_IMAG: | |
8361 | { | |
8362 | Expression* arg = this->one_arg(); | |
8363 | return arg != NULL && arg->is_constant(); | |
8364 | } | |
8365 | ||
8366 | default: | |
8367 | break; | |
8368 | } | |
8369 | ||
8370 | return false; | |
8371 | } | |
8372 | ||
0c77715b | 8373 | // Return a numeric constant if possible. |
e440a328 | 8374 | |
8375 | bool | |
0c77715b | 8376 | Builtin_call_expression::do_numeric_constant_value(Numeric_constant* nc) const |
e440a328 | 8377 | { |
8378 | if (this->code_ == BUILTIN_LEN | |
8379 | || this->code_ == BUILTIN_CAP) | |
8380 | { | |
8381 | Expression* arg = this->one_arg(); | |
8382 | if (arg == NULL) | |
8383 | return false; | |
8384 | Type* arg_type = arg->type(); | |
8385 | ||
8386 | if (this->code_ == BUILTIN_LEN && arg_type->is_string_type()) | |
8387 | { | |
8388 | std::string sval; | |
8389 | if (arg->string_constant_value(&sval)) | |
8390 | { | |
0c77715b | 8391 | nc->set_unsigned_long(Type::lookup_integer_type("int"), |
8392 | sval.length()); | |
e440a328 | 8393 | return true; |
8394 | } | |
8395 | } | |
8396 | ||
8397 | if (arg_type->points_to() != NULL | |
8398 | && arg_type->points_to()->array_type() != NULL | |
411eb89e | 8399 | && !arg_type->points_to()->is_slice_type()) |
e440a328 | 8400 | arg_type = arg_type->points_to(); |
8401 | ||
8402 | if (arg_type->array_type() != NULL | |
8403 | && arg_type->array_type()->length() != NULL) | |
8404 | { | |
0f914071 | 8405 | if (this->seen_) |
8406 | return false; | |
e440a328 | 8407 | Expression* e = arg_type->array_type()->length(); |
0f914071 | 8408 | this->seen_ = true; |
0c77715b | 8409 | bool r = e->numeric_constant_value(nc); |
0f914071 | 8410 | this->seen_ = false; |
8411 | if (r) | |
e440a328 | 8412 | { |
0c77715b | 8413 | if (!nc->set_type(Type::lookup_integer_type("int"), false, |
8414 | this->location())) | |
8415 | r = false; | |
e440a328 | 8416 | } |
0c77715b | 8417 | return r; |
e440a328 | 8418 | } |
8419 | } | |
8420 | else if (this->code_ == BUILTIN_SIZEOF | |
8421 | || this->code_ == BUILTIN_ALIGNOF) | |
8422 | { | |
8423 | Expression* arg = this->one_arg(); | |
8424 | if (arg == NULL) | |
8425 | return false; | |
8426 | Type* arg_type = arg->type(); | |
5c13bd80 | 8427 | if (arg_type->is_error()) |
e440a328 | 8428 | return false; |
8429 | if (arg_type->is_abstract()) | |
7200ac0e | 8430 | arg_type = arg_type->make_non_abstract_type(); |
2c809f8f | 8431 | if (this->seen_) |
8432 | return false; | |
927a01eb | 8433 | |
3f378015 | 8434 | int64_t ret; |
e440a328 | 8435 | if (this->code_ == BUILTIN_SIZEOF) |
8436 | { | |
2c809f8f | 8437 | this->seen_ = true; |
8438 | bool ok = arg_type->backend_type_size(this->gogo_, &ret); | |
8439 | this->seen_ = false; | |
8440 | if (!ok) | |
e440a328 | 8441 | return false; |
8442 | } | |
8443 | else if (this->code_ == BUILTIN_ALIGNOF) | |
8444 | { | |
2c809f8f | 8445 | bool ok; |
8446 | this->seen_ = true; | |
637bd3af | 8447 | if (arg->field_reference_expression() == NULL) |
2c809f8f | 8448 | ok = arg_type->backend_type_align(this->gogo_, &ret); |
637bd3af | 8449 | else |
e440a328 | 8450 | { |
8451 | // Calling unsafe.Alignof(s.f) returns the alignment of | |
8452 | // the type of f when it is used as a field in a struct. | |
2c809f8f | 8453 | ok = arg_type->backend_type_field_align(this->gogo_, &ret); |
e440a328 | 8454 | } |
2c809f8f | 8455 | this->seen_ = false; |
8456 | if (!ok) | |
8457 | return false; | |
e440a328 | 8458 | } |
8459 | else | |
c3e6f413 | 8460 | go_unreachable(); |
927a01eb | 8461 | |
3f378015 | 8462 | mpz_t zval; |
8463 | set_mpz_from_int64(&zval, ret); | |
8464 | nc->set_int(Type::lookup_integer_type("uintptr"), zval); | |
8465 | mpz_clear(zval); | |
e440a328 | 8466 | return true; |
8467 | } | |
8468 | else if (this->code_ == BUILTIN_OFFSETOF) | |
8469 | { | |
8470 | Expression* arg = this->one_arg(); | |
8471 | if (arg == NULL) | |
8472 | return false; | |
8473 | Field_reference_expression* farg = arg->field_reference_expression(); | |
8474 | if (farg == NULL) | |
8475 | return false; | |
2c809f8f | 8476 | if (this->seen_) |
8477 | return false; | |
8478 | ||
3f378015 | 8479 | int64_t total_offset = 0; |
9a4bd570 | 8480 | while (true) |
8481 | { | |
8482 | Expression* struct_expr = farg->expr(); | |
8483 | Type* st = struct_expr->type(); | |
8484 | if (st->struct_type() == NULL) | |
8485 | return false; | |
8486 | if (st->named_type() != NULL) | |
8487 | st->named_type()->convert(this->gogo_); | |
fbabafbd | 8488 | if (st->is_error_type()) |
8489 | { | |
8490 | go_assert(saw_errors()); | |
8491 | return false; | |
8492 | } | |
3f378015 | 8493 | int64_t offset; |
2c809f8f | 8494 | this->seen_ = true; |
8495 | bool ok = st->struct_type()->backend_field_offset(this->gogo_, | |
8496 | farg->field_index(), | |
8497 | &offset); | |
8498 | this->seen_ = false; | |
8499 | if (!ok) | |
8500 | return false; | |
9a4bd570 | 8501 | total_offset += offset; |
8502 | if (farg->implicit() && struct_expr->field_reference_expression() != NULL) | |
8503 | { | |
8504 | // Go up until we reach the original base. | |
8505 | farg = struct_expr->field_reference_expression(); | |
8506 | continue; | |
8507 | } | |
8508 | break; | |
8509 | } | |
3f378015 | 8510 | mpz_t zval; |
8511 | set_mpz_from_int64(&zval, total_offset); | |
8512 | nc->set_int(Type::lookup_integer_type("uintptr"), zval); | |
8513 | mpz_clear(zval); | |
e440a328 | 8514 | return true; |
8515 | } | |
0c77715b | 8516 | else if (this->code_ == BUILTIN_REAL || this->code_ == BUILTIN_IMAG) |
e440a328 | 8517 | { |
8518 | Expression* arg = this->one_arg(); | |
8519 | if (arg == NULL) | |
8520 | return false; | |
8521 | ||
0c77715b | 8522 | Numeric_constant argnc; |
8523 | if (!arg->numeric_constant_value(&argnc)) | |
8524 | return false; | |
8525 | ||
fcbea5e4 | 8526 | mpc_t val; |
8527 | if (!argnc.to_complex(&val)) | |
0c77715b | 8528 | return false; |
e440a328 | 8529 | |
0c77715b | 8530 | Type* type = Builtin_call_expression::real_imag_type(argnc.type()); |
8531 | if (this->code_ == BUILTIN_REAL) | |
fcbea5e4 | 8532 | nc->set_float(type, mpc_realref(val)); |
0c77715b | 8533 | else |
fcbea5e4 | 8534 | nc->set_float(type, mpc_imagref(val)); |
8535 | mpc_clear(val); | |
0c77715b | 8536 | return true; |
e440a328 | 8537 | } |
0c77715b | 8538 | else if (this->code_ == BUILTIN_COMPLEX) |
e440a328 | 8539 | { |
8540 | const Expression_list* args = this->args(); | |
8541 | if (args == NULL || args->size() != 2) | |
8542 | return false; | |
8543 | ||
0c77715b | 8544 | Numeric_constant rnc; |
8545 | if (!args->front()->numeric_constant_value(&rnc)) | |
8546 | return false; | |
8547 | Numeric_constant inc; | |
8548 | if (!args->back()->numeric_constant_value(&inc)) | |
8549 | return false; | |
8550 | ||
8551 | if (rnc.type() != NULL | |
8552 | && !rnc.type()->is_abstract() | |
8553 | && inc.type() != NULL | |
8554 | && !inc.type()->is_abstract() | |
3a522dcc | 8555 | && !Type::are_identical(rnc.type(), inc.type(), |
8556 | Type::COMPARE_ERRORS | Type::COMPARE_TAGS, | |
8557 | NULL)) | |
0c77715b | 8558 | return false; |
8559 | ||
e440a328 | 8560 | mpfr_t r; |
0c77715b | 8561 | if (!rnc.to_float(&r)) |
8562 | return false; | |
8563 | mpfr_t i; | |
8564 | if (!inc.to_float(&i)) | |
e440a328 | 8565 | { |
8566 | mpfr_clear(r); | |
8567 | return false; | |
8568 | } | |
8569 | ||
0c77715b | 8570 | Type* arg_type = rnc.type(); |
8571 | if (arg_type == NULL || arg_type->is_abstract()) | |
8572 | arg_type = inc.type(); | |
e440a328 | 8573 | |
fcbea5e4 | 8574 | mpc_t val; |
8575 | mpc_init2(val, mpc_precision); | |
8576 | mpc_set_fr_fr(val, r, i, MPC_RNDNN); | |
e440a328 | 8577 | mpfr_clear(r); |
8578 | mpfr_clear(i); | |
8579 | ||
fcbea5e4 | 8580 | Type* type = Builtin_call_expression::complex_type(arg_type); |
8581 | nc->set_complex(type, val); | |
8582 | ||
8583 | mpc_clear(val); | |
8584 | ||
0c77715b | 8585 | return true; |
e440a328 | 8586 | } |
8587 | ||
8588 | return false; | |
8589 | } | |
8590 | ||
a7549a6a | 8591 | // Give an error if we are discarding the value of an expression which |
8592 | // should not normally be discarded. We don't give an error for | |
8593 | // discarding the value of an ordinary function call, but we do for | |
8594 | // builtin functions, purely for consistency with the gc compiler. | |
8595 | ||
4f2138d7 | 8596 | bool |
a7549a6a | 8597 | Builtin_call_expression::do_discarding_value() |
8598 | { | |
8599 | switch (this->code_) | |
8600 | { | |
8601 | case BUILTIN_INVALID: | |
8602 | default: | |
8603 | go_unreachable(); | |
8604 | ||
8605 | case BUILTIN_APPEND: | |
8606 | case BUILTIN_CAP: | |
8607 | case BUILTIN_COMPLEX: | |
8608 | case BUILTIN_IMAG: | |
8609 | case BUILTIN_LEN: | |
8610 | case BUILTIN_MAKE: | |
8611 | case BUILTIN_NEW: | |
8612 | case BUILTIN_REAL: | |
8613 | case BUILTIN_ALIGNOF: | |
8614 | case BUILTIN_OFFSETOF: | |
8615 | case BUILTIN_SIZEOF: | |
8616 | this->unused_value_error(); | |
4f2138d7 | 8617 | return false; |
a7549a6a | 8618 | |
8619 | case BUILTIN_CLOSE: | |
8620 | case BUILTIN_COPY: | |
1cce762f | 8621 | case BUILTIN_DELETE: |
a7549a6a | 8622 | case BUILTIN_PANIC: |
8623 | case BUILTIN_PRINT: | |
8624 | case BUILTIN_PRINTLN: | |
8625 | case BUILTIN_RECOVER: | |
4f2138d7 | 8626 | return true; |
a7549a6a | 8627 | } |
8628 | } | |
8629 | ||
e440a328 | 8630 | // Return the type. |
8631 | ||
8632 | Type* | |
8633 | Builtin_call_expression::do_type() | |
8634 | { | |
79651b1f | 8635 | if (this->is_error_expression()) |
8636 | return Type::make_error_type(); | |
e440a328 | 8637 | switch (this->code_) |
8638 | { | |
8639 | case BUILTIN_INVALID: | |
8640 | default: | |
79651b1f | 8641 | return Type::make_error_type(); |
e440a328 | 8642 | |
8643 | case BUILTIN_NEW: | |
e440a328 | 8644 | { |
8645 | const Expression_list* args = this->args(); | |
8646 | if (args == NULL || args->empty()) | |
8647 | return Type::make_error_type(); | |
8648 | return Type::make_pointer_type(args->front()->type()); | |
8649 | } | |
8650 | ||
a065edc5 | 8651 | case BUILTIN_MAKE: |
8652 | { | |
8653 | const Expression_list* args = this->args(); | |
8654 | if (args == NULL || args->empty()) | |
8655 | return Type::make_error_type(); | |
8656 | return args->front()->type(); | |
8657 | } | |
8658 | ||
e440a328 | 8659 | case BUILTIN_CAP: |
8660 | case BUILTIN_COPY: | |
8661 | case BUILTIN_LEN: | |
7ba86326 | 8662 | return Type::lookup_integer_type("int"); |
8663 | ||
e440a328 | 8664 | case BUILTIN_ALIGNOF: |
8665 | case BUILTIN_OFFSETOF: | |
8666 | case BUILTIN_SIZEOF: | |
7ba86326 | 8667 | return Type::lookup_integer_type("uintptr"); |
e440a328 | 8668 | |
8669 | case BUILTIN_CLOSE: | |
1cce762f | 8670 | case BUILTIN_DELETE: |
e440a328 | 8671 | case BUILTIN_PANIC: |
8672 | case BUILTIN_PRINT: | |
8673 | case BUILTIN_PRINTLN: | |
8674 | return Type::make_void_type(); | |
8675 | ||
e440a328 | 8676 | case BUILTIN_RECOVER: |
823c7e3d | 8677 | return Type::make_empty_interface_type(Linemap::predeclared_location()); |
e440a328 | 8678 | |
8679 | case BUILTIN_APPEND: | |
8680 | { | |
8681 | const Expression_list* args = this->args(); | |
8682 | if (args == NULL || args->empty()) | |
8683 | return Type::make_error_type(); | |
3ff4863b | 8684 | Type *ret = args->front()->type(); |
8685 | if (!ret->is_slice_type()) | |
8686 | return Type::make_error_type(); | |
8687 | return ret; | |
e440a328 | 8688 | } |
8689 | ||
8690 | case BUILTIN_REAL: | |
8691 | case BUILTIN_IMAG: | |
8692 | { | |
8693 | Expression* arg = this->one_arg(); | |
8694 | if (arg == NULL) | |
8695 | return Type::make_error_type(); | |
8696 | Type* t = arg->type(); | |
8697 | if (t->is_abstract()) | |
8698 | t = t->make_non_abstract_type(); | |
8699 | t = Builtin_call_expression::real_imag_type(t); | |
8700 | if (t == NULL) | |
8701 | t = Type::make_error_type(); | |
8702 | return t; | |
8703 | } | |
8704 | ||
48080209 | 8705 | case BUILTIN_COMPLEX: |
e440a328 | 8706 | { |
8707 | const Expression_list* args = this->args(); | |
8708 | if (args == NULL || args->size() != 2) | |
8709 | return Type::make_error_type(); | |
8710 | Type* t = args->front()->type(); | |
8711 | if (t->is_abstract()) | |
8712 | { | |
8713 | t = args->back()->type(); | |
8714 | if (t->is_abstract()) | |
8715 | t = t->make_non_abstract_type(); | |
8716 | } | |
48080209 | 8717 | t = Builtin_call_expression::complex_type(t); |
e440a328 | 8718 | if (t == NULL) |
8719 | t = Type::make_error_type(); | |
8720 | return t; | |
8721 | } | |
8722 | } | |
8723 | } | |
8724 | ||
8725 | // Determine the type. | |
8726 | ||
8727 | void | |
8728 | Builtin_call_expression::do_determine_type(const Type_context* context) | |
8729 | { | |
fb94b0ca | 8730 | if (!this->determining_types()) |
8731 | return; | |
8732 | ||
e440a328 | 8733 | this->fn()->determine_type_no_context(); |
8734 | ||
8735 | const Expression_list* args = this->args(); | |
8736 | ||
8737 | bool is_print; | |
8738 | Type* arg_type = NULL; | |
321e5ad2 | 8739 | Type* trailing_arg_types = NULL; |
e440a328 | 8740 | switch (this->code_) |
8741 | { | |
8742 | case BUILTIN_PRINT: | |
8743 | case BUILTIN_PRINTLN: | |
8744 | // Do not force a large integer constant to "int". | |
8745 | is_print = true; | |
8746 | break; | |
8747 | ||
8748 | case BUILTIN_REAL: | |
8749 | case BUILTIN_IMAG: | |
48080209 | 8750 | arg_type = Builtin_call_expression::complex_type(context->type); |
f6bc81e6 | 8751 | if (arg_type == NULL) |
8752 | arg_type = Type::lookup_complex_type("complex128"); | |
e440a328 | 8753 | is_print = false; |
8754 | break; | |
8755 | ||
48080209 | 8756 | case BUILTIN_COMPLEX: |
e440a328 | 8757 | { |
48080209 | 8758 | // For the complex function the type of one operand can |
e440a328 | 8759 | // determine the type of the other, as in a binary expression. |
8760 | arg_type = Builtin_call_expression::real_imag_type(context->type); | |
f6bc81e6 | 8761 | if (arg_type == NULL) |
8762 | arg_type = Type::lookup_float_type("float64"); | |
e440a328 | 8763 | if (args != NULL && args->size() == 2) |
8764 | { | |
8765 | Type* t1 = args->front()->type(); | |
c849bb59 | 8766 | Type* t2 = args->back()->type(); |
e440a328 | 8767 | if (!t1->is_abstract()) |
8768 | arg_type = t1; | |
8769 | else if (!t2->is_abstract()) | |
8770 | arg_type = t2; | |
8771 | } | |
8772 | is_print = false; | |
8773 | } | |
8774 | break; | |
8775 | ||
321e5ad2 | 8776 | case BUILTIN_APPEND: |
8777 | if (!this->is_varargs() | |
8778 | && args != NULL | |
8779 | && !args->empty() | |
8780 | && args->front()->type()->is_slice_type()) | |
8781 | trailing_arg_types = | |
8782 | args->front()->type()->array_type()->element_type(); | |
8783 | is_print = false; | |
8784 | break; | |
8785 | ||
e440a328 | 8786 | default: |
8787 | is_print = false; | |
8788 | break; | |
8789 | } | |
8790 | ||
8791 | if (args != NULL) | |
8792 | { | |
8793 | for (Expression_list::const_iterator pa = args->begin(); | |
8794 | pa != args->end(); | |
8795 | ++pa) | |
8796 | { | |
8797 | Type_context subcontext; | |
8798 | subcontext.type = arg_type; | |
8799 | ||
8800 | if (is_print) | |
8801 | { | |
8802 | // We want to print large constants, we so can't just | |
8803 | // use the appropriate nonabstract type. Use uint64 for | |
8804 | // an integer if we know it is nonnegative, otherwise | |
8805 | // use int64 for a integer, otherwise use float64 for a | |
8806 | // float or complex128 for a complex. | |
8807 | Type* want_type = NULL; | |
8808 | Type* atype = (*pa)->type(); | |
8809 | if (atype->is_abstract()) | |
8810 | { | |
8811 | if (atype->integer_type() != NULL) | |
8812 | { | |
0c77715b | 8813 | Numeric_constant nc; |
8814 | if (this->numeric_constant_value(&nc)) | |
8815 | { | |
8816 | mpz_t val; | |
8817 | if (nc.to_int(&val)) | |
8818 | { | |
8819 | if (mpz_sgn(val) >= 0) | |
8820 | want_type = Type::lookup_integer_type("uint64"); | |
8821 | mpz_clear(val); | |
8822 | } | |
8823 | } | |
8824 | if (want_type == NULL) | |
e440a328 | 8825 | want_type = Type::lookup_integer_type("int64"); |
e440a328 | 8826 | } |
8827 | else if (atype->float_type() != NULL) | |
8828 | want_type = Type::lookup_float_type("float64"); | |
8829 | else if (atype->complex_type() != NULL) | |
8830 | want_type = Type::lookup_complex_type("complex128"); | |
8831 | else if (atype->is_abstract_string_type()) | |
8832 | want_type = Type::lookup_string_type(); | |
8833 | else if (atype->is_abstract_boolean_type()) | |
8834 | want_type = Type::lookup_bool_type(); | |
8835 | else | |
c3e6f413 | 8836 | go_unreachable(); |
e440a328 | 8837 | subcontext.type = want_type; |
8838 | } | |
8839 | } | |
8840 | ||
8841 | (*pa)->determine_type(&subcontext); | |
321e5ad2 | 8842 | |
8843 | if (trailing_arg_types != NULL) | |
8844 | { | |
8845 | arg_type = trailing_arg_types; | |
8846 | trailing_arg_types = NULL; | |
8847 | } | |
e440a328 | 8848 | } |
8849 | } | |
8850 | } | |
8851 | ||
8852 | // If there is exactly one argument, return true. Otherwise give an | |
8853 | // error message and return false. | |
8854 | ||
8855 | bool | |
8856 | Builtin_call_expression::check_one_arg() | |
8857 | { | |
8858 | const Expression_list* args = this->args(); | |
8859 | if (args == NULL || args->size() < 1) | |
8860 | { | |
8861 | this->report_error(_("not enough arguments")); | |
8862 | return false; | |
8863 | } | |
8864 | else if (args->size() > 1) | |
8865 | { | |
8866 | this->report_error(_("too many arguments")); | |
8867 | return false; | |
8868 | } | |
8869 | if (args->front()->is_error_expression() | |
5c13bd80 | 8870 | || args->front()->type()->is_error()) |
e440a328 | 8871 | { |
8872 | this->set_is_error(); | |
8873 | return false; | |
8874 | } | |
8875 | return true; | |
8876 | } | |
8877 | ||
8878 | // Check argument types for a builtin function. | |
8879 | ||
8880 | void | |
8881 | Builtin_call_expression::do_check_types(Gogo*) | |
8882 | { | |
375646ea | 8883 | if (this->is_error_expression()) |
8884 | return; | |
e440a328 | 8885 | switch (this->code_) |
8886 | { | |
8887 | case BUILTIN_INVALID: | |
8888 | case BUILTIN_NEW: | |
8889 | case BUILTIN_MAKE: | |
cd238b8d | 8890 | case BUILTIN_DELETE: |
e440a328 | 8891 | return; |
8892 | ||
8893 | case BUILTIN_LEN: | |
8894 | case BUILTIN_CAP: | |
8895 | { | |
8896 | // The single argument may be either a string or an array or a | |
8897 | // map or a channel, or a pointer to a closed array. | |
8898 | if (this->check_one_arg()) | |
8899 | { | |
8900 | Type* arg_type = this->one_arg()->type(); | |
8901 | if (arg_type->points_to() != NULL | |
8902 | && arg_type->points_to()->array_type() != NULL | |
411eb89e | 8903 | && !arg_type->points_to()->is_slice_type()) |
e440a328 | 8904 | arg_type = arg_type->points_to(); |
8905 | if (this->code_ == BUILTIN_CAP) | |
8906 | { | |
5c13bd80 | 8907 | if (!arg_type->is_error() |
e440a328 | 8908 | && arg_type->array_type() == NULL |
8909 | && arg_type->channel_type() == NULL) | |
8910 | this->report_error(_("argument must be array or slice " | |
8911 | "or channel")); | |
8912 | } | |
8913 | else | |
8914 | { | |
5c13bd80 | 8915 | if (!arg_type->is_error() |
e440a328 | 8916 | && !arg_type->is_string_type() |
8917 | && arg_type->array_type() == NULL | |
8918 | && arg_type->map_type() == NULL | |
8919 | && arg_type->channel_type() == NULL) | |
8920 | this->report_error(_("argument must be string or " | |
8921 | "array or slice or map or channel")); | |
8922 | } | |
8923 | } | |
8924 | } | |
8925 | break; | |
8926 | ||
8927 | case BUILTIN_PRINT: | |
8928 | case BUILTIN_PRINTLN: | |
8929 | { | |
8930 | const Expression_list* args = this->args(); | |
8931 | if (args == NULL) | |
8932 | { | |
8933 | if (this->code_ == BUILTIN_PRINT) | |
631d5788 | 8934 | go_warning_at(this->location(), 0, |
e440a328 | 8935 | "no arguments for builtin function %<%s%>", |
8936 | (this->code_ == BUILTIN_PRINT | |
8937 | ? "print" | |
8938 | : "println")); | |
8939 | } | |
8940 | else | |
8941 | { | |
8942 | for (Expression_list::const_iterator p = args->begin(); | |
8943 | p != args->end(); | |
8944 | ++p) | |
8945 | { | |
8946 | Type* type = (*p)->type(); | |
5c13bd80 | 8947 | if (type->is_error() |
e440a328 | 8948 | || type->is_string_type() |
8949 | || type->integer_type() != NULL | |
8950 | || type->float_type() != NULL | |
8951 | || type->complex_type() != NULL | |
8952 | || type->is_boolean_type() | |
8953 | || type->points_to() != NULL | |
8954 | || type->interface_type() != NULL | |
8955 | || type->channel_type() != NULL | |
8956 | || type->map_type() != NULL | |
8957 | || type->function_type() != NULL | |
411eb89e | 8958 | || type->is_slice_type()) |
e440a328 | 8959 | ; |
acf8e158 | 8960 | else if ((*p)->is_type_expression()) |
8961 | { | |
8962 | // If this is a type expression it's going to give | |
8963 | // an error anyhow, so we don't need one here. | |
8964 | } | |
e440a328 | 8965 | else |
8966 | this->report_error(_("unsupported argument type to " | |
8967 | "builtin function")); | |
8968 | } | |
8969 | } | |
8970 | } | |
8971 | break; | |
8972 | ||
8973 | case BUILTIN_CLOSE: | |
e440a328 | 8974 | if (this->check_one_arg()) |
8975 | { | |
8976 | if (this->one_arg()->type()->channel_type() == NULL) | |
8977 | this->report_error(_("argument must be channel")); | |
5202d986 | 8978 | else if (!this->one_arg()->type()->channel_type()->may_send()) |
8979 | this->report_error(_("cannot close receive-only channel")); | |
e440a328 | 8980 | } |
8981 | break; | |
8982 | ||
8983 | case BUILTIN_PANIC: | |
8984 | case BUILTIN_SIZEOF: | |
8985 | case BUILTIN_ALIGNOF: | |
8986 | this->check_one_arg(); | |
8987 | break; | |
8988 | ||
8989 | case BUILTIN_RECOVER: | |
6334270b | 8990 | if (this->args() != NULL |
8991 | && !this->args()->empty() | |
8992 | && !this->recover_arg_is_set_) | |
e440a328 | 8993 | this->report_error(_("too many arguments")); |
8994 | break; | |
8995 | ||
8996 | case BUILTIN_OFFSETOF: | |
8997 | if (this->check_one_arg()) | |
8998 | { | |
8999 | Expression* arg = this->one_arg(); | |
9000 | if (arg->field_reference_expression() == NULL) | |
9001 | this->report_error(_("argument must be a field reference")); | |
9002 | } | |
9003 | break; | |
9004 | ||
9005 | case BUILTIN_COPY: | |
9006 | { | |
9007 | const Expression_list* args = this->args(); | |
9008 | if (args == NULL || args->size() < 2) | |
9009 | { | |
9010 | this->report_error(_("not enough arguments")); | |
9011 | break; | |
9012 | } | |
9013 | else if (args->size() > 2) | |
9014 | { | |
9015 | this->report_error(_("too many arguments")); | |
9016 | break; | |
9017 | } | |
9018 | Type* arg1_type = args->front()->type(); | |
9019 | Type* arg2_type = args->back()->type(); | |
5c13bd80 | 9020 | if (arg1_type->is_error() || arg2_type->is_error()) |
6bebb39d | 9021 | { |
9022 | this->set_is_error(); | |
9023 | break; | |
9024 | } | |
e440a328 | 9025 | |
9026 | Type* e1; | |
411eb89e | 9027 | if (arg1_type->is_slice_type()) |
e440a328 | 9028 | e1 = arg1_type->array_type()->element_type(); |
9029 | else | |
9030 | { | |
9031 | this->report_error(_("left argument must be a slice")); | |
9032 | break; | |
9033 | } | |
9034 | ||
411eb89e | 9035 | if (arg2_type->is_slice_type()) |
60963afd | 9036 | { |
9037 | Type* e2 = arg2_type->array_type()->element_type(); | |
3a522dcc | 9038 | if (!Type::are_identical(e1, e2, Type::COMPARE_TAGS, NULL)) |
60963afd | 9039 | this->report_error(_("element types must be the same")); |
9040 | } | |
e440a328 | 9041 | else if (arg2_type->is_string_type()) |
e440a328 | 9042 | { |
60963afd | 9043 | if (e1->integer_type() == NULL || !e1->integer_type()->is_byte()) |
9044 | this->report_error(_("first argument must be []byte")); | |
e440a328 | 9045 | } |
60963afd | 9046 | else |
9047 | this->report_error(_("second argument must be slice or string")); | |
e440a328 | 9048 | } |
9049 | break; | |
9050 | ||
9051 | case BUILTIN_APPEND: | |
9052 | { | |
9053 | const Expression_list* args = this->args(); | |
321e5ad2 | 9054 | if (args == NULL || args->empty()) |
e440a328 | 9055 | { |
9056 | this->report_error(_("not enough arguments")); | |
9057 | break; | |
9058 | } | |
321e5ad2 | 9059 | |
9060 | Type* slice_type = args->front()->type(); | |
9061 | if (!slice_type->is_slice_type()) | |
6bebb39d | 9062 | { |
321e5ad2 | 9063 | if (slice_type->is_error_type()) |
9064 | break; | |
9065 | if (slice_type->is_nil_type()) | |
9066 | go_error_at(args->front()->location(), "use of untyped nil"); | |
9067 | else | |
9068 | go_error_at(args->front()->location(), | |
9069 | "argument 1 must be a slice"); | |
6bebb39d | 9070 | this->set_is_error(); |
9071 | break; | |
9072 | } | |
cd238b8d | 9073 | |
321e5ad2 | 9074 | Type* element_type = slice_type->array_type()->element_type(); |
22deed0d | 9075 | if (!element_type->in_heap()) |
9076 | go_error_at(args->front()->location(), | |
9077 | "can't append to slice of go:notinheap type"); | |
321e5ad2 | 9078 | if (this->is_varargs()) |
4fd4fcf4 | 9079 | { |
321e5ad2 | 9080 | if (!args->back()->type()->is_slice_type() |
9081 | && !args->back()->type()->is_string_type()) | |
9082 | { | |
9083 | go_error_at(args->back()->location(), | |
9084 | "invalid use of %<...%> with non-slice/non-string"); | |
9085 | this->set_is_error(); | |
9086 | break; | |
9087 | } | |
4fd4fcf4 | 9088 | |
321e5ad2 | 9089 | if (args->size() < 2) |
9090 | { | |
9091 | this->report_error(_("not enough arguments")); | |
9092 | break; | |
9093 | } | |
9094 | if (args->size() > 2) | |
9095 | { | |
9096 | this->report_error(_("too many arguments")); | |
9097 | break; | |
9098 | } | |
9099 | ||
9100 | if (args->back()->type()->is_string_type() | |
9101 | && element_type->integer_type() != NULL | |
9102 | && element_type->integer_type()->is_byte()) | |
9103 | { | |
9104 | // Permit append(s1, s2...) when s1 is a slice of | |
9105 | // bytes and s2 is a string type. | |
9106 | } | |
e440a328 | 9107 | else |
9108 | { | |
321e5ad2 | 9109 | // We have to test for assignment compatibility to a |
9110 | // slice of the element type, which is not necessarily | |
9111 | // the same as the type of the first argument: the | |
9112 | // first argument might have a named type. | |
9113 | Type* check_type = Type::make_array_type(element_type, NULL); | |
9114 | std::string reason; | |
9115 | if (!Type::are_assignable(check_type, args->back()->type(), | |
9116 | &reason)) | |
9117 | { | |
9118 | if (reason.empty()) | |
9119 | go_error_at(args->back()->location(), | |
9120 | "argument 2 has invalid type"); | |
9121 | else | |
9122 | go_error_at(args->back()->location(), | |
9123 | "argument 2 has invalid type (%s)", | |
9124 | reason.c_str()); | |
9125 | this->set_is_error(); | |
9126 | break; | |
9127 | } | |
9128 | } | |
9129 | } | |
9130 | else | |
9131 | { | |
9132 | Expression_list::const_iterator pa = args->begin(); | |
9133 | int i = 2; | |
9134 | for (++pa; pa != args->end(); ++pa, ++i) | |
9135 | { | |
9136 | std::string reason; | |
9137 | if (!Type::are_assignable(element_type, (*pa)->type(), | |
9138 | &reason)) | |
9139 | { | |
9140 | if (reason.empty()) | |
9141 | go_error_at((*pa)->location(), | |
9142 | "argument %d has incompatible type", i); | |
9143 | else | |
9144 | go_error_at((*pa)->location(), | |
9145 | "argument %d has incompatible type (%s)", | |
9146 | i, reason.c_str()); | |
9147 | this->set_is_error(); | |
9148 | } | |
e440a328 | 9149 | } |
9150 | } | |
e440a328 | 9151 | } |
321e5ad2 | 9152 | break; |
e440a328 | 9153 | |
9154 | case BUILTIN_REAL: | |
9155 | case BUILTIN_IMAG: | |
9156 | if (this->check_one_arg()) | |
9157 | { | |
9158 | if (this->one_arg()->type()->complex_type() == NULL) | |
9159 | this->report_error(_("argument must have complex type")); | |
9160 | } | |
9161 | break; | |
9162 | ||
48080209 | 9163 | case BUILTIN_COMPLEX: |
e440a328 | 9164 | { |
9165 | const Expression_list* args = this->args(); | |
9166 | if (args == NULL || args->size() < 2) | |
9167 | this->report_error(_("not enough arguments")); | |
9168 | else if (args->size() > 2) | |
9169 | this->report_error(_("too many arguments")); | |
9170 | else if (args->front()->is_error_expression() | |
5c13bd80 | 9171 | || args->front()->type()->is_error() |
e440a328 | 9172 | || args->back()->is_error_expression() |
5c13bd80 | 9173 | || args->back()->type()->is_error()) |
e440a328 | 9174 | this->set_is_error(); |
9175 | else if (!Type::are_identical(args->front()->type(), | |
3a522dcc | 9176 | args->back()->type(), |
9177 | Type::COMPARE_TAGS, NULL)) | |
48080209 | 9178 | this->report_error(_("complex arguments must have identical types")); |
e440a328 | 9179 | else if (args->front()->type()->float_type() == NULL) |
48080209 | 9180 | this->report_error(_("complex arguments must have " |
e440a328 | 9181 | "floating-point type")); |
9182 | } | |
9183 | break; | |
9184 | ||
9185 | default: | |
c3e6f413 | 9186 | go_unreachable(); |
e440a328 | 9187 | } |
9188 | } | |
9189 | ||
72666aed | 9190 | Expression* |
9191 | Builtin_call_expression::do_copy() | |
9192 | { | |
9193 | Call_expression* bce = | |
9194 | new Builtin_call_expression(this->gogo_, this->fn()->copy(), | |
da244e59 | 9195 | (this->args() == NULL |
9196 | ? NULL | |
9197 | : this->args()->copy()), | |
72666aed | 9198 | this->is_varargs(), |
9199 | this->location()); | |
9200 | ||
9201 | if (this->varargs_are_lowered()) | |
9202 | bce->set_varargs_are_lowered(); | |
28819633 | 9203 | if (this->is_deferred()) |
9204 | bce->set_is_deferred(); | |
9205 | if (this->is_concurrent()) | |
9206 | bce->set_is_concurrent(); | |
72666aed | 9207 | return bce; |
9208 | } | |
9209 | ||
ea664253 | 9210 | // Return the backend representation for a builtin function. |
e440a328 | 9211 | |
ea664253 | 9212 | Bexpression* |
9213 | Builtin_call_expression::do_get_backend(Translate_context* context) | |
e440a328 | 9214 | { |
9215 | Gogo* gogo = context->gogo(); | |
b13c66cd | 9216 | Location location = this->location(); |
a0d8874e | 9217 | |
9218 | if (this->is_erroneous_call()) | |
9219 | { | |
9220 | go_assert(saw_errors()); | |
9221 | return gogo->backend()->error_expression(); | |
9222 | } | |
9223 | ||
e440a328 | 9224 | switch (this->code_) |
9225 | { | |
9226 | case BUILTIN_INVALID: | |
9227 | case BUILTIN_NEW: | |
9228 | case BUILTIN_MAKE: | |
c3e6f413 | 9229 | go_unreachable(); |
e440a328 | 9230 | |
9231 | case BUILTIN_LEN: | |
9232 | case BUILTIN_CAP: | |
9233 | { | |
9234 | const Expression_list* args = this->args(); | |
c484d925 | 9235 | go_assert(args != NULL && args->size() == 1); |
2c809f8f | 9236 | Expression* arg = args->front(); |
e440a328 | 9237 | Type* arg_type = arg->type(); |
0f914071 | 9238 | |
9239 | if (this->seen_) | |
9240 | { | |
c484d925 | 9241 | go_assert(saw_errors()); |
ea664253 | 9242 | return context->backend()->error_expression(); |
0f914071 | 9243 | } |
9244 | this->seen_ = true; | |
0f914071 | 9245 | this->seen_ = false; |
e440a328 | 9246 | if (arg_type->points_to() != NULL) |
9247 | { | |
9248 | arg_type = arg_type->points_to(); | |
c484d925 | 9249 | go_assert(arg_type->array_type() != NULL |
411eb89e | 9250 | && !arg_type->is_slice_type()); |
f614ea8b | 9251 | arg = Expression::make_dereference(arg, NIL_CHECK_DEFAULT, |
9252 | location); | |
e440a328 | 9253 | } |
9254 | ||
1b1f2abf | 9255 | Type* int_type = Type::lookup_integer_type("int"); |
2c809f8f | 9256 | Expression* val; |
e440a328 | 9257 | if (this->code_ == BUILTIN_LEN) |
9258 | { | |
9259 | if (arg_type->is_string_type()) | |
2c809f8f | 9260 | val = Expression::make_string_info(arg, STRING_INFO_LENGTH, |
9261 | location); | |
e440a328 | 9262 | else if (arg_type->array_type() != NULL) |
0f914071 | 9263 | { |
9264 | if (this->seen_) | |
9265 | { | |
c484d925 | 9266 | go_assert(saw_errors()); |
ea664253 | 9267 | return context->backend()->error_expression(); |
0f914071 | 9268 | } |
9269 | this->seen_ = true; | |
2c809f8f | 9270 | val = arg_type->array_type()->get_length(gogo, arg); |
0f914071 | 9271 | this->seen_ = false; |
9272 | } | |
0d5530d9 | 9273 | else if (arg_type->map_type() != NULL |
9274 | || arg_type->channel_type() != NULL) | |
9275 | { | |
9276 | // The first field is the length. If the pointer is | |
9277 | // nil, the length is zero. | |
9278 | Type* pint_type = Type::make_pointer_type(int_type); | |
9279 | arg = Expression::make_unsafe_cast(pint_type, arg, location); | |
9280 | Expression* nil = Expression::make_nil(location); | |
9281 | nil = Expression::make_cast(pint_type, nil, location); | |
9282 | Expression* cmp = Expression::make_binary(OPERATOR_EQEQ, | |
9283 | arg, nil, location); | |
9284 | Expression* zero = Expression::make_integer_ul(0, int_type, | |
9285 | location); | |
f614ea8b | 9286 | Expression* indir = |
9287 | Expression::make_dereference(arg, NIL_CHECK_NOT_NEEDED, | |
9288 | location); | |
0d5530d9 | 9289 | val = Expression::make_conditional(cmp, zero, indir, location); |
9290 | } | |
e440a328 | 9291 | else |
c3e6f413 | 9292 | go_unreachable(); |
e440a328 | 9293 | } |
9294 | else | |
9295 | { | |
9296 | if (arg_type->array_type() != NULL) | |
0f914071 | 9297 | { |
9298 | if (this->seen_) | |
9299 | { | |
c484d925 | 9300 | go_assert(saw_errors()); |
ea664253 | 9301 | return context->backend()->error_expression(); |
0f914071 | 9302 | } |
9303 | this->seen_ = true; | |
2c809f8f | 9304 | val = arg_type->array_type()->get_capacity(gogo, arg); |
0f914071 | 9305 | this->seen_ = false; |
9306 | } | |
e440a328 | 9307 | else if (arg_type->channel_type() != NULL) |
132ed071 | 9308 | { |
9309 | // The second field is the capacity. If the pointer | |
9310 | // is nil, the capacity is zero. | |
9311 | Type* uintptr_type = Type::lookup_integer_type("uintptr"); | |
9312 | Type* pint_type = Type::make_pointer_type(int_type); | |
9313 | Expression* parg = Expression::make_unsafe_cast(uintptr_type, | |
9314 | arg, | |
9315 | location); | |
9316 | int off = int_type->integer_type()->bits() / 8; | |
9317 | Expression* eoff = Expression::make_integer_ul(off, | |
9318 | uintptr_type, | |
9319 | location); | |
9320 | parg = Expression::make_binary(OPERATOR_PLUS, parg, eoff, | |
9321 | location); | |
9322 | parg = Expression::make_unsafe_cast(pint_type, parg, location); | |
9323 | Expression* nil = Expression::make_nil(location); | |
9324 | nil = Expression::make_cast(pint_type, nil, location); | |
9325 | Expression* cmp = Expression::make_binary(OPERATOR_EQEQ, | |
9326 | arg, nil, location); | |
9327 | Expression* zero = Expression::make_integer_ul(0, int_type, | |
9328 | location); | |
f614ea8b | 9329 | Expression* indir = |
9330 | Expression::make_dereference(parg, NIL_CHECK_NOT_NEEDED, | |
9331 | location); | |
132ed071 | 9332 | val = Expression::make_conditional(cmp, zero, indir, location); |
9333 | } | |
e440a328 | 9334 | else |
c3e6f413 | 9335 | go_unreachable(); |
e440a328 | 9336 | } |
9337 | ||
2c809f8f | 9338 | return Expression::make_cast(int_type, val, |
ea664253 | 9339 | location)->get_backend(context); |
e440a328 | 9340 | } |
9341 | ||
9342 | case BUILTIN_PRINT: | |
9343 | case BUILTIN_PRINTLN: | |
9344 | { | |
9345 | const bool is_ln = this->code_ == BUILTIN_PRINTLN; | |
88b03a70 | 9346 | |
9347 | Expression* print_stmts = Runtime::make_call(Runtime::PRINTLOCK, | |
9348 | location, 0); | |
e440a328 | 9349 | |
9350 | const Expression_list* call_args = this->args(); | |
9351 | if (call_args != NULL) | |
9352 | { | |
9353 | for (Expression_list::const_iterator p = call_args->begin(); | |
9354 | p != call_args->end(); | |
9355 | ++p) | |
9356 | { | |
9357 | if (is_ln && p != call_args->begin()) | |
9358 | { | |
2c809f8f | 9359 | Expression* print_space = |
88b03a70 | 9360 | Runtime::make_call(Runtime::PRINTSP, location, 0); |
e440a328 | 9361 | |
2c809f8f | 9362 | print_stmts = |
9363 | Expression::make_compound(print_stmts, print_space, | |
9364 | location); | |
9365 | } | |
e440a328 | 9366 | |
2c809f8f | 9367 | Expression* arg = *p; |
9368 | Type* type = arg->type(); | |
9369 | Runtime::Function code; | |
e440a328 | 9370 | if (type->is_string_type()) |
88b03a70 | 9371 | code = Runtime::PRINTSTRING; |
e440a328 | 9372 | else if (type->integer_type() != NULL |
9373 | && type->integer_type()->is_unsigned()) | |
9374 | { | |
e440a328 | 9375 | Type* itype = Type::lookup_integer_type("uint64"); |
2c809f8f | 9376 | arg = Expression::make_cast(itype, arg, location); |
88b03a70 | 9377 | code = Runtime::PRINTUINT; |
e440a328 | 9378 | } |
9379 | else if (type->integer_type() != NULL) | |
9380 | { | |
e440a328 | 9381 | Type* itype = Type::lookup_integer_type("int64"); |
2c809f8f | 9382 | arg = Expression::make_cast(itype, arg, location); |
88b03a70 | 9383 | code = Runtime::PRINTINT; |
e440a328 | 9384 | } |
9385 | else if (type->float_type() != NULL) | |
9386 | { | |
2c809f8f | 9387 | Type* dtype = Type::lookup_float_type("float64"); |
9388 | arg = Expression::make_cast(dtype, arg, location); | |
88b03a70 | 9389 | code = Runtime::PRINTFLOAT; |
e440a328 | 9390 | } |
9391 | else if (type->complex_type() != NULL) | |
9392 | { | |
2c809f8f | 9393 | Type* ctype = Type::lookup_complex_type("complex128"); |
9394 | arg = Expression::make_cast(ctype, arg, location); | |
88b03a70 | 9395 | code = Runtime::PRINTCOMPLEX; |
e440a328 | 9396 | } |
9397 | else if (type->is_boolean_type()) | |
88b03a70 | 9398 | code = Runtime::PRINTBOOL; |
e440a328 | 9399 | else if (type->points_to() != NULL |
9400 | || type->channel_type() != NULL | |
9401 | || type->map_type() != NULL | |
9402 | || type->function_type() != NULL) | |
9403 | { | |
2c809f8f | 9404 | arg = Expression::make_cast(type, arg, location); |
88b03a70 | 9405 | code = Runtime::PRINTPOINTER; |
e440a328 | 9406 | } |
9407 | else if (type->interface_type() != NULL) | |
9408 | { | |
9409 | if (type->interface_type()->is_empty()) | |
88b03a70 | 9410 | code = Runtime::PRINTEFACE; |
e440a328 | 9411 | else |
88b03a70 | 9412 | code = Runtime::PRINTIFACE; |
e440a328 | 9413 | } |
411eb89e | 9414 | else if (type->is_slice_type()) |
88b03a70 | 9415 | code = Runtime::PRINTSLICE; |
e440a328 | 9416 | else |
cd238b8d | 9417 | { |
9418 | go_assert(saw_errors()); | |
ea664253 | 9419 | return context->backend()->error_expression(); |
cd238b8d | 9420 | } |
e440a328 | 9421 | |
2c809f8f | 9422 | Expression* call = Runtime::make_call(code, location, 1, arg); |
88b03a70 | 9423 | print_stmts = Expression::make_compound(print_stmts, call, |
9424 | location); | |
e440a328 | 9425 | } |
9426 | } | |
9427 | ||
9428 | if (is_ln) | |
9429 | { | |
2c809f8f | 9430 | Expression* print_nl = |
88b03a70 | 9431 | Runtime::make_call(Runtime::PRINTNL, location, 0); |
9432 | print_stmts = Expression::make_compound(print_stmts, print_nl, | |
9433 | location); | |
e440a328 | 9434 | } |
9435 | ||
88b03a70 | 9436 | Expression* unlock = Runtime::make_call(Runtime::PRINTUNLOCK, |
9437 | location, 0); | |
9438 | print_stmts = Expression::make_compound(print_stmts, unlock, location); | |
32e3ff69 | 9439 | |
ea664253 | 9440 | return print_stmts->get_backend(context); |
e440a328 | 9441 | } |
9442 | ||
9443 | case BUILTIN_PANIC: | |
9444 | { | |
9445 | const Expression_list* args = this->args(); | |
c484d925 | 9446 | go_assert(args != NULL && args->size() == 1); |
e440a328 | 9447 | Expression* arg = args->front(); |
b13c66cd | 9448 | Type *empty = |
823c7e3d | 9449 | Type::make_empty_interface_type(Linemap::predeclared_location()); |
2c809f8f | 9450 | arg = Expression::convert_for_assignment(gogo, empty, arg, location); |
9451 | ||
9452 | Expression* panic = | |
03ac9de4 | 9453 | Runtime::make_call(Runtime::GOPANIC, location, 1, arg); |
ea664253 | 9454 | return panic->get_backend(context); |
e440a328 | 9455 | } |
9456 | ||
9457 | case BUILTIN_RECOVER: | |
9458 | { | |
9459 | // The argument is set when building recover thunks. It's a | |
9460 | // boolean value which is true if we can recover a value now. | |
9461 | const Expression_list* args = this->args(); | |
c484d925 | 9462 | go_assert(args != NULL && args->size() == 1); |
e440a328 | 9463 | Expression* arg = args->front(); |
b13c66cd | 9464 | Type *empty = |
823c7e3d | 9465 | Type::make_empty_interface_type(Linemap::predeclared_location()); |
e440a328 | 9466 | |
e440a328 | 9467 | Expression* nil = Expression::make_nil(location); |
2c809f8f | 9468 | nil = Expression::convert_for_assignment(gogo, empty, nil, location); |
e440a328 | 9469 | |
9470 | // We need to handle a deferred call to recover specially, | |
9471 | // because it changes whether it can recover a panic or not. | |
9472 | // See test7 in test/recover1.go. | |
2c809f8f | 9473 | Expression* recover = Runtime::make_call((this->is_deferred() |
03ac9de4 | 9474 | ? Runtime::DEFERREDRECOVER |
9475 | : Runtime::GORECOVER), | |
2c809f8f | 9476 | location, 0); |
9477 | Expression* cond = | |
9478 | Expression::make_conditional(arg, recover, nil, location); | |
ea664253 | 9479 | return cond->get_backend(context); |
e440a328 | 9480 | } |
9481 | ||
9482 | case BUILTIN_CLOSE: | |
e440a328 | 9483 | { |
9484 | const Expression_list* args = this->args(); | |
c484d925 | 9485 | go_assert(args != NULL && args->size() == 1); |
e440a328 | 9486 | Expression* arg = args->front(); |
2c809f8f | 9487 | Expression* close = Runtime::make_call(Runtime::CLOSE, location, |
9488 | 1, arg); | |
ea664253 | 9489 | return close->get_backend(context); |
e440a328 | 9490 | } |
9491 | ||
9492 | case BUILTIN_SIZEOF: | |
9493 | case BUILTIN_OFFSETOF: | |
9494 | case BUILTIN_ALIGNOF: | |
9495 | { | |
0c77715b | 9496 | Numeric_constant nc; |
9497 | unsigned long val; | |
9498 | if (!this->numeric_constant_value(&nc) | |
9499 | || nc.to_unsigned_long(&val) != Numeric_constant::NC_UL_VALID) | |
7f1d9abd | 9500 | { |
c484d925 | 9501 | go_assert(saw_errors()); |
ea664253 | 9502 | return context->backend()->error_expression(); |
7f1d9abd | 9503 | } |
7ba86326 | 9504 | Type* uintptr_type = Type::lookup_integer_type("uintptr"); |
2c809f8f | 9505 | mpz_t ival; |
9506 | nc.get_int(&ival); | |
9507 | Expression* int_cst = | |
e67508fa | 9508 | Expression::make_integer_z(&ival, uintptr_type, location); |
2c809f8f | 9509 | mpz_clear(ival); |
ea664253 | 9510 | return int_cst->get_backend(context); |
e440a328 | 9511 | } |
9512 | ||
9513 | case BUILTIN_COPY: | |
9514 | { | |
9515 | const Expression_list* args = this->args(); | |
c484d925 | 9516 | go_assert(args != NULL && args->size() == 2); |
e440a328 | 9517 | Expression* arg1 = args->front(); |
9518 | Expression* arg2 = args->back(); | |
9519 | ||
e440a328 | 9520 | Type* arg1_type = arg1->type(); |
9521 | Array_type* at = arg1_type->array_type(); | |
35a54f17 | 9522 | go_assert(arg1->is_variable()); |
321e5ad2 | 9523 | |
9524 | Expression* call; | |
e440a328 | 9525 | |
9526 | Type* arg2_type = arg2->type(); | |
2c809f8f | 9527 | go_assert(arg2->is_variable()); |
321e5ad2 | 9528 | if (arg2_type->is_string_type()) |
9529 | call = Runtime::make_call(Runtime::SLICESTRINGCOPY, location, | |
9530 | 2, arg1, arg2); | |
e440a328 | 9531 | else |
9532 | { | |
321e5ad2 | 9533 | Type* et = at->element_type(); |
9534 | if (et->has_pointer()) | |
9535 | { | |
9536 | Expression* td = Expression::make_type_descriptor(et, | |
9537 | location); | |
9538 | call = Runtime::make_call(Runtime::TYPEDSLICECOPY, location, | |
9539 | 3, td, arg1, arg2); | |
9540 | } | |
9541 | else | |
9542 | { | |
9543 | Expression* sz = Expression::make_type_info(et, | |
9544 | TYPE_INFO_SIZE); | |
9545 | call = Runtime::make_call(Runtime::SLICECOPY, location, 3, | |
9546 | arg1, arg2, sz); | |
9547 | } | |
e440a328 | 9548 | } |
2c809f8f | 9549 | |
321e5ad2 | 9550 | return call->get_backend(context); |
e440a328 | 9551 | } |
9552 | ||
9553 | case BUILTIN_APPEND: | |
321e5ad2 | 9554 | // Handled in Builtin_call_expression::flatten_append. |
9555 | go_unreachable(); | |
e440a328 | 9556 | |
9557 | case BUILTIN_REAL: | |
9558 | case BUILTIN_IMAG: | |
9559 | { | |
9560 | const Expression_list* args = this->args(); | |
c484d925 | 9561 | go_assert(args != NULL && args->size() == 1); |
2c809f8f | 9562 | |
9563 | Bexpression* ret; | |
ea664253 | 9564 | Bexpression* bcomplex = args->front()->get_backend(context); |
2c809f8f | 9565 | if (this->code_ == BUILTIN_REAL) |
9566 | ret = gogo->backend()->real_part_expression(bcomplex, location); | |
9567 | else | |
9568 | ret = gogo->backend()->imag_part_expression(bcomplex, location); | |
ea664253 | 9569 | return ret; |
e440a328 | 9570 | } |
9571 | ||
48080209 | 9572 | case BUILTIN_COMPLEX: |
e440a328 | 9573 | { |
9574 | const Expression_list* args = this->args(); | |
c484d925 | 9575 | go_assert(args != NULL && args->size() == 2); |
ea664253 | 9576 | Bexpression* breal = args->front()->get_backend(context); |
9577 | Bexpression* bimag = args->back()->get_backend(context); | |
9578 | return gogo->backend()->complex_expression(breal, bimag, location); | |
e440a328 | 9579 | } |
9580 | ||
9581 | default: | |
c3e6f413 | 9582 | go_unreachable(); |
e440a328 | 9583 | } |
9584 | } | |
9585 | ||
9586 | // We have to support exporting a builtin call expression, because | |
9587 | // code can set a constant to the result of a builtin expression. | |
9588 | ||
9589 | void | |
548be246 | 9590 | Builtin_call_expression::do_export(Export_function_body* efb) const |
e440a328 | 9591 | { |
0c77715b | 9592 | Numeric_constant nc; |
9593 | if (!this->numeric_constant_value(&nc)) | |
9594 | { | |
631d5788 | 9595 | go_error_at(this->location(), "value is not constant"); |
0c77715b | 9596 | return; |
9597 | } | |
e440a328 | 9598 | |
0c77715b | 9599 | if (nc.is_int()) |
e440a328 | 9600 | { |
0c77715b | 9601 | mpz_t val; |
9602 | nc.get_int(&val); | |
548be246 | 9603 | Integer_expression::export_integer(efb, val); |
0c77715b | 9604 | mpz_clear(val); |
e440a328 | 9605 | } |
0c77715b | 9606 | else if (nc.is_float()) |
e440a328 | 9607 | { |
9608 | mpfr_t fval; | |
0c77715b | 9609 | nc.get_float(&fval); |
548be246 | 9610 | Float_expression::export_float(efb, fval); |
e440a328 | 9611 | mpfr_clear(fval); |
9612 | } | |
0c77715b | 9613 | else if (nc.is_complex()) |
e440a328 | 9614 | { |
fcbea5e4 | 9615 | mpc_t cval; |
9616 | nc.get_complex(&cval); | |
548be246 | 9617 | Complex_expression::export_complex(efb, cval); |
fcbea5e4 | 9618 | mpc_clear(cval); |
e440a328 | 9619 | } |
0c77715b | 9620 | else |
9621 | go_unreachable(); | |
e440a328 | 9622 | |
9623 | // A trailing space lets us reliably identify the end of the number. | |
548be246 | 9624 | efb->write_c_string(" "); |
e440a328 | 9625 | } |
9626 | ||
9627 | // Class Call_expression. | |
9628 | ||
8381eda7 | 9629 | // A Go function can be viewed in a couple of different ways. The |
9630 | // code of a Go function becomes a backend function with parameters | |
9631 | // whose types are simply the backend representation of the Go types. | |
9632 | // If there are multiple results, they are returned as a backend | |
9633 | // struct. | |
9634 | ||
9635 | // However, when Go code refers to a function other than simply | |
9636 | // calling it, the backend type of that function is actually a struct. | |
9637 | // The first field of the struct points to the Go function code | |
9638 | // (sometimes a wrapper as described below). The remaining fields | |
9639 | // hold addresses of closed-over variables. This struct is called a | |
9640 | // closure. | |
9641 | ||
9642 | // There are a few cases to consider. | |
9643 | ||
9644 | // A direct function call of a known function in package scope. In | |
9645 | // this case there are no closed-over variables, and we know the name | |
9646 | // of the function code. We can simply produce a backend call to the | |
9647 | // function directly, and not worry about the closure. | |
9648 | ||
9649 | // A direct function call of a known function literal. In this case | |
9650 | // we know the function code and we know the closure. We generate the | |
9651 | // function code such that it expects an additional final argument of | |
9652 | // the closure type. We pass the closure as the last argument, after | |
9653 | // the other arguments. | |
9654 | ||
9655 | // An indirect function call. In this case we have a closure. We | |
9656 | // load the pointer to the function code from the first field of the | |
9657 | // closure. We pass the address of the closure as the last argument. | |
9658 | ||
9659 | // A call to a method of an interface. Type methods are always at | |
9660 | // package scope, so we call the function directly, and don't worry | |
9661 | // about the closure. | |
9662 | ||
9663 | // This means that for a function at package scope we have two cases. | |
9664 | // One is the direct call, which has no closure. The other is the | |
9665 | // indirect call, which does have a closure. We can't simply ignore | |
9666 | // the closure, even though it is the last argument, because that will | |
9667 | // fail on targets where the function pops its arguments. So when | |
9668 | // generating a closure for a package-scope function we set the | |
9669 | // function code pointer in the closure to point to a wrapper | |
9670 | // function. This wrapper function accepts a final argument that | |
9671 | // points to the closure, ignores it, and calls the real function as a | |
9672 | // direct function call. This wrapper will normally be efficient, and | |
9673 | // can often simply be a tail call to the real function. | |
9674 | ||
9675 | // We don't use GCC's static chain pointer because 1) we don't need | |
9676 | // it; 2) GCC only permits using a static chain to call a known | |
9677 | // function, so we can't use it for an indirect call anyhow. Since we | |
9678 | // can't use it for an indirect call, we may as well not worry about | |
9679 | // using it for a direct call either. | |
9680 | ||
9681 | // We pass the closure last rather than first because it means that | |
9682 | // the function wrapper we put into a closure for a package-scope | |
9683 | // function can normally just be a tail call to the real function. | |
9684 | ||
9685 | // For method expressions we generate a wrapper that loads the | |
9686 | // receiver from the closure and then calls the method. This | |
9687 | // unfortunately forces reshuffling the arguments, since there is a | |
9688 | // new first argument, but we can't avoid reshuffling either for | |
9689 | // method expressions or for indirect calls of package-scope | |
9690 | // functions, and since the latter are more common we reshuffle for | |
9691 | // method expressions. | |
9692 | ||
9693 | // Note that the Go code retains the Go types. The extra final | |
9694 | // argument only appears when we convert to the backend | |
9695 | // representation. | |
9696 | ||
e440a328 | 9697 | // Traversal. |
9698 | ||
9699 | int | |
9700 | Call_expression::do_traverse(Traverse* traverse) | |
9701 | { | |
0c0dacab | 9702 | // If we are calling a function in a different package that returns |
9703 | // an unnamed type, this may be the only chance we get to traverse | |
9704 | // that type. We don't traverse this->type_ because it may be a | |
9705 | // Call_multiple_result_type that will just lead back here. | |
9706 | if (this->type_ != NULL && !this->type_->is_error_type()) | |
9707 | { | |
9708 | Function_type *fntype = this->get_function_type(); | |
9709 | if (fntype != NULL && Type::traverse(fntype, traverse) == TRAVERSE_EXIT) | |
9710 | return TRAVERSE_EXIT; | |
9711 | } | |
e440a328 | 9712 | if (Expression::traverse(&this->fn_, traverse) == TRAVERSE_EXIT) |
9713 | return TRAVERSE_EXIT; | |
9714 | if (this->args_ != NULL) | |
9715 | { | |
9716 | if (this->args_->traverse(traverse) == TRAVERSE_EXIT) | |
9717 | return TRAVERSE_EXIT; | |
9718 | } | |
9719 | return TRAVERSE_CONTINUE; | |
9720 | } | |
9721 | ||
9722 | // Lower a call statement. | |
9723 | ||
9724 | Expression* | |
ceeb4318 | 9725 | Call_expression::do_lower(Gogo* gogo, Named_object* function, |
9726 | Statement_inserter* inserter, int) | |
e440a328 | 9727 | { |
b13c66cd | 9728 | Location loc = this->location(); |
09ea332d | 9729 | |
ceeb4318 | 9730 | // A type cast can look like a function call. |
e440a328 | 9731 | if (this->fn_->is_type_expression() |
9732 | && this->args_ != NULL | |
9733 | && this->args_->size() == 1) | |
9734 | return Expression::make_cast(this->fn_->type(), this->args_->front(), | |
09ea332d | 9735 | loc); |
e440a328 | 9736 | |
88f06749 | 9737 | // Because do_type will return an error type and thus prevent future |
9738 | // errors, check for that case now to ensure that the error gets | |
9739 | // reported. | |
37448b10 | 9740 | Function_type* fntype = this->get_function_type(); |
9741 | if (fntype == NULL) | |
88f06749 | 9742 | { |
9743 | if (!this->fn_->type()->is_error()) | |
9744 | this->report_error(_("expected function")); | |
5f1045b5 | 9745 | this->set_is_error(); |
9746 | return this; | |
88f06749 | 9747 | } |
9748 | ||
e440a328 | 9749 | // Handle an argument which is a call to a function which returns |
9750 | // multiple results. | |
9751 | if (this->args_ != NULL | |
9752 | && this->args_->size() == 1 | |
37448b10 | 9753 | && this->args_->front()->call_expression() != NULL) |
e440a328 | 9754 | { |
e440a328 | 9755 | size_t rc = this->args_->front()->call_expression()->result_count(); |
9756 | if (rc > 1 | |
37448b10 | 9757 | && ((fntype->parameters() != NULL |
9758 | && (fntype->parameters()->size() == rc | |
9759 | || (fntype->is_varargs() | |
9760 | && fntype->parameters()->size() - 1 <= rc))) | |
9761 | || fntype->is_builtin())) | |
e440a328 | 9762 | { |
9763 | Call_expression* call = this->args_->front()->call_expression(); | |
e90ecd2d | 9764 | call->set_is_multi_value_arg(); |
c33af8e4 | 9765 | if (this->is_varargs_) |
9766 | { | |
9767 | // It is not clear which result of a multiple result call | |
9768 | // the ellipsis operator should be applied to. If we unpack the | |
9769 | // the call into its individual results here, the ellipsis will be | |
9770 | // applied to the last result. | |
631d5788 | 9771 | go_error_at(call->location(), |
9772 | _("multiple-value argument in single-value context")); | |
c33af8e4 | 9773 | return Expression::make_error(call->location()); |
9774 | } | |
9775 | ||
e440a328 | 9776 | Expression_list* args = new Expression_list; |
9777 | for (size_t i = 0; i < rc; ++i) | |
9778 | args->push_back(Expression::make_call_result(call, i)); | |
9779 | // We can't return a new call expression here, because this | |
42535814 | 9780 | // one may be referenced by Call_result expressions. We |
9781 | // also can't delete the old arguments, because we may still | |
9782 | // traverse them somewhere up the call stack. FIXME. | |
e440a328 | 9783 | this->args_ = args; |
9784 | } | |
9785 | } | |
9786 | ||
37448b10 | 9787 | // Recognize a call to a builtin function. |
9788 | if (fntype->is_builtin()) | |
28819633 | 9789 | { |
9790 | Builtin_call_expression* bce = | |
9791 | new Builtin_call_expression(gogo, this->fn_, this->args_, | |
9792 | this->is_varargs_, loc); | |
9793 | if (this->is_deferred_) | |
9794 | bce->set_is_deferred(); | |
9795 | if (this->is_concurrent_) | |
9796 | bce->set_is_concurrent(); | |
9797 | return bce; | |
9798 | } | |
37448b10 | 9799 | |
ceeb4318 | 9800 | // If this call returns multiple results, create a temporary |
5731103c | 9801 | // variable to hold them. |
9802 | if (this->result_count() > 1 && this->call_temp_ == NULL) | |
ceeb4318 | 9803 | { |
5731103c | 9804 | Struct_field_list* sfl = new Struct_field_list(); |
9805 | Function_type* fntype = this->get_function_type(); | |
37448b10 | 9806 | const Typed_identifier_list* results = fntype->results(); |
5731103c | 9807 | Location loc = this->location(); |
9808 | ||
9809 | int i = 0; | |
9810 | char buf[20]; | |
ceeb4318 | 9811 | for (Typed_identifier_list::const_iterator p = results->begin(); |
5731103c | 9812 | p != results->end(); |
9813 | ++p, ++i) | |
9814 | { | |
9815 | snprintf(buf, sizeof buf, "res%d", i); | |
9816 | sfl->push_back(Struct_field(Typed_identifier(buf, p->type(), loc))); | |
9817 | } | |
9818 | ||
9819 | Struct_type* st = Type::make_struct_type(sfl, loc); | |
9820 | st->set_is_struct_incomparable(); | |
9821 | this->call_temp_ = Statement::make_temporary(st, NULL, loc); | |
9822 | inserter->insert(this->call_temp_); | |
ceeb4318 | 9823 | } |
9824 | ||
e440a328 | 9825 | // Handle a call to a varargs function by packaging up the extra |
9826 | // parameters. | |
37448b10 | 9827 | if (fntype->is_varargs()) |
e440a328 | 9828 | { |
e440a328 | 9829 | const Typed_identifier_list* parameters = fntype->parameters(); |
c484d925 | 9830 | go_assert(parameters != NULL && !parameters->empty()); |
e440a328 | 9831 | Type* varargs_type = parameters->back().type(); |
09ea332d | 9832 | this->lower_varargs(gogo, function, inserter, varargs_type, |
0e9a2e72 | 9833 | parameters->size(), SLICE_STORAGE_MAY_ESCAPE); |
09ea332d | 9834 | } |
9835 | ||
9836 | // If this is call to a method, call the method directly passing the | |
9837 | // object as the first parameter. | |
9838 | Bound_method_expression* bme = this->fn_->bound_method_expression(); | |
9839 | if (bme != NULL) | |
9840 | { | |
0afbb937 | 9841 | Named_object* methodfn = bme->function(); |
09ea332d | 9842 | Expression* first_arg = bme->first_argument(); |
9843 | ||
9844 | // We always pass a pointer when calling a method. | |
9845 | if (first_arg->type()->points_to() == NULL | |
9846 | && !first_arg->type()->is_error()) | |
9847 | { | |
9848 | first_arg = Expression::make_unary(OPERATOR_AND, first_arg, loc); | |
9849 | // We may need to create a temporary variable so that we can | |
9850 | // take the address. We can't do that here because it will | |
9851 | // mess up the order of evaluation. | |
9852 | Unary_expression* ue = static_cast<Unary_expression*>(first_arg); | |
9853 | ue->set_create_temp(); | |
9854 | } | |
9855 | ||
9856 | // If we are calling a method which was inherited from an | |
9857 | // embedded struct, and the method did not get a stub, then the | |
9858 | // first type may be wrong. | |
9859 | Type* fatype = bme->first_argument_type(); | |
9860 | if (fatype != NULL) | |
9861 | { | |
9862 | if (fatype->points_to() == NULL) | |
9863 | fatype = Type::make_pointer_type(fatype); | |
9864 | first_arg = Expression::make_unsafe_cast(fatype, first_arg, loc); | |
9865 | } | |
9866 | ||
9867 | Expression_list* new_args = new Expression_list(); | |
9868 | new_args->push_back(first_arg); | |
9869 | if (this->args_ != NULL) | |
9870 | { | |
9871 | for (Expression_list::const_iterator p = this->args_->begin(); | |
9872 | p != this->args_->end(); | |
9873 | ++p) | |
9874 | new_args->push_back(*p); | |
9875 | } | |
9876 | ||
9877 | // We have to change in place because this structure may be | |
9878 | // referenced by Call_result_expressions. We can't delete the | |
9879 | // old arguments, because we may be traversing them up in some | |
9880 | // caller. FIXME. | |
9881 | this->args_ = new_args; | |
0afbb937 | 9882 | this->fn_ = Expression::make_func_reference(methodfn, NULL, |
09ea332d | 9883 | bme->location()); |
e440a328 | 9884 | } |
9885 | ||
105f9a24 | 9886 | // Handle a couple of special runtime functions. In the runtime |
9887 | // package, getcallerpc returns the PC of the caller, and | |
9888 | // getcallersp returns the frame pointer of the caller. Implement | |
9889 | // these by turning them into calls to GCC builtin functions. We | |
9890 | // could implement them in normal code, but then we would have to | |
9891 | // explicitly unwind the stack. These functions are intended to be | |
9892 | // efficient. Note that this technique obviously only works for | |
33d1d391 | 9893 | // direct calls, but that is the only way they are used. |
9894 | if (gogo->compiling_runtime() && gogo->package_name() == "runtime") | |
105f9a24 | 9895 | { |
9896 | Func_expression* fe = this->fn_->func_expression(); | |
9897 | if (fe != NULL | |
9898 | && fe->named_object()->is_function_declaration() | |
9899 | && fe->named_object()->package() == NULL) | |
9900 | { | |
9901 | std::string n = Gogo::unpack_hidden_name(fe->named_object()->name()); | |
33d1d391 | 9902 | if ((this->args_ == NULL || this->args_->size() == 0) |
9903 | && n == "getcallerpc") | |
105f9a24 | 9904 | { |
9905 | static Named_object* builtin_return_address; | |
9a8c5dc0 | 9906 | int arg = 0; |
105f9a24 | 9907 | return this->lower_to_builtin(&builtin_return_address, |
9908 | "__builtin_return_address", | |
9a8c5dc0 | 9909 | &arg); |
105f9a24 | 9910 | } |
b5665f52 | 9911 | else if ((this->args_ == NULL || this->args_->size() == 0) |
33d1d391 | 9912 | && n == "getcallersp") |
105f9a24 | 9913 | { |
9a8c5dc0 | 9914 | static Named_object* builtin_dwarf_cfa; |
9915 | return this->lower_to_builtin(&builtin_dwarf_cfa, | |
9916 | "__builtin_dwarf_cfa", | |
9917 | NULL); | |
105f9a24 | 9918 | } |
9919 | } | |
9920 | } | |
9921 | ||
81affb1d | 9922 | // If this is a call to an imported function for which we have an |
9923 | // inlinable function body, add it to the list of functions to give | |
9924 | // to the backend as inlining opportunities. | |
9925 | Func_expression* fe = this->fn_->func_expression(); | |
9926 | if (fe != NULL | |
9927 | && fe->named_object()->is_function_declaration() | |
9928 | && fe->named_object()->func_declaration_value()->has_imported_body()) | |
9929 | gogo->add_imported_inlinable_function(fe->named_object()); | |
9930 | ||
e440a328 | 9931 | return this; |
9932 | } | |
9933 | ||
9934 | // Lower a call to a varargs function. FUNCTION is the function in | |
9935 | // which the call occurs--it's not the function we are calling. | |
9936 | // VARARGS_TYPE is the type of the varargs parameter, a slice type. | |
9937 | // PARAM_COUNT is the number of parameters of the function we are | |
9938 | // calling; the last of these parameters will be the varargs | |
9939 | // parameter. | |
9940 | ||
09ea332d | 9941 | void |
e440a328 | 9942 | Call_expression::lower_varargs(Gogo* gogo, Named_object* function, |
ceeb4318 | 9943 | Statement_inserter* inserter, |
0e9a2e72 | 9944 | Type* varargs_type, size_t param_count, |
9945 | Slice_storage_escape_disp escape_disp) | |
e440a328 | 9946 | { |
9947 | if (this->varargs_are_lowered_) | |
09ea332d | 9948 | return; |
e440a328 | 9949 | |
b13c66cd | 9950 | Location loc = this->location(); |
e440a328 | 9951 | |
c484d925 | 9952 | go_assert(param_count > 0); |
411eb89e | 9953 | go_assert(varargs_type->is_slice_type()); |
e440a328 | 9954 | |
9955 | size_t arg_count = this->args_ == NULL ? 0 : this->args_->size(); | |
9956 | if (arg_count < param_count - 1) | |
9957 | { | |
9958 | // Not enough arguments; will be caught in check_types. | |
09ea332d | 9959 | return; |
e440a328 | 9960 | } |
9961 | ||
9962 | Expression_list* old_args = this->args_; | |
9963 | Expression_list* new_args = new Expression_list(); | |
9964 | bool push_empty_arg = false; | |
9965 | if (old_args == NULL || old_args->empty()) | |
9966 | { | |
c484d925 | 9967 | go_assert(param_count == 1); |
e440a328 | 9968 | push_empty_arg = true; |
9969 | } | |
9970 | else | |
9971 | { | |
9972 | Expression_list::const_iterator pa; | |
9973 | int i = 1; | |
9974 | for (pa = old_args->begin(); pa != old_args->end(); ++pa, ++i) | |
9975 | { | |
9976 | if (static_cast<size_t>(i) == param_count) | |
9977 | break; | |
9978 | new_args->push_back(*pa); | |
9979 | } | |
9980 | ||
9981 | // We have reached the varargs parameter. | |
9982 | ||
9983 | bool issued_error = false; | |
9984 | if (pa == old_args->end()) | |
9985 | push_empty_arg = true; | |
9986 | else if (pa + 1 == old_args->end() && this->is_varargs_) | |
9987 | new_args->push_back(*pa); | |
9988 | else if (this->is_varargs_) | |
9989 | { | |
a6645f74 | 9990 | if ((*pa)->type()->is_slice_type()) |
9991 | this->report_error(_("too many arguments")); | |
9992 | else | |
9993 | { | |
631d5788 | 9994 | go_error_at(this->location(), |
9995 | _("invalid use of %<...%> with non-slice")); | |
a6645f74 | 9996 | this->set_is_error(); |
9997 | } | |
09ea332d | 9998 | return; |
e440a328 | 9999 | } |
e440a328 | 10000 | else |
10001 | { | |
10002 | Type* element_type = varargs_type->array_type()->element_type(); | |
10003 | Expression_list* vals = new Expression_list; | |
10004 | for (; pa != old_args->end(); ++pa, ++i) | |
10005 | { | |
10006 | // Check types here so that we get a better message. | |
10007 | Type* patype = (*pa)->type(); | |
b13c66cd | 10008 | Location paloc = (*pa)->location(); |
e440a328 | 10009 | if (!this->check_argument_type(i, element_type, patype, |
10010 | paloc, issued_error)) | |
10011 | continue; | |
10012 | vals->push_back(*pa); | |
10013 | } | |
0e9a2e72 | 10014 | Slice_construction_expression* sce = |
e440a328 | 10015 | Expression::make_slice_composite_literal(varargs_type, vals, loc); |
0e9a2e72 | 10016 | if (escape_disp == SLICE_STORAGE_DOES_NOT_ESCAPE) |
10017 | sce->set_storage_does_not_escape(); | |
10018 | Expression* val = sce; | |
09ea332d | 10019 | gogo->lower_expression(function, inserter, &val); |
e440a328 | 10020 | new_args->push_back(val); |
10021 | } | |
10022 | } | |
10023 | ||
10024 | if (push_empty_arg) | |
10025 | new_args->push_back(Expression::make_nil(loc)); | |
10026 | ||
10027 | // We can't return a new call expression here, because this one may | |
6d4c2432 | 10028 | // be referenced by Call_result expressions. FIXME. We can't |
10029 | // delete OLD_ARGS because we may have both a Call_expression and a | |
10030 | // Builtin_call_expression which refer to them. FIXME. | |
e440a328 | 10031 | this->args_ = new_args; |
10032 | this->varargs_are_lowered_ = true; | |
e440a328 | 10033 | } |
10034 | ||
9a8c5dc0 | 10035 | // Return a call to __builtin_return_address or __builtin_dwarf_cfa. |
105f9a24 | 10036 | |
10037 | Expression* | |
10038 | Call_expression::lower_to_builtin(Named_object** pno, const char* name, | |
9a8c5dc0 | 10039 | int* arg) |
105f9a24 | 10040 | { |
10041 | if (*pno == NULL) | |
9a8c5dc0 | 10042 | *pno = Gogo::declare_builtin_rf_address(name, arg != NULL); |
105f9a24 | 10043 | |
10044 | Location loc = this->location(); | |
10045 | ||
10046 | Expression* fn = Expression::make_func_reference(*pno, NULL, loc); | |
105f9a24 | 10047 | Expression_list *args = new Expression_list(); |
9a8c5dc0 | 10048 | if (arg != NULL) |
10049 | { | |
10050 | Expression* a = Expression::make_integer_ul(*arg, NULL, loc); | |
10051 | args->push_back(a); | |
10052 | } | |
105f9a24 | 10053 | Expression* call = Expression::make_call(fn, args, false, loc); |
10054 | ||
10055 | // The builtin functions return void*, but the Go functions return uintptr. | |
10056 | Type* uintptr_type = Type::lookup_integer_type("uintptr"); | |
10057 | return Expression::make_cast(uintptr_type, call, loc); | |
10058 | } | |
10059 | ||
2c809f8f | 10060 | // Flatten a call with multiple results into a temporary. |
10061 | ||
10062 | Expression* | |
b8e86a51 | 10063 | Call_expression::do_flatten(Gogo* gogo, Named_object*, |
10064 | Statement_inserter* inserter) | |
2c809f8f | 10065 | { |
5bf8be8b | 10066 | if (this->is_erroneous_call()) |
10067 | { | |
10068 | go_assert(saw_errors()); | |
10069 | return Expression::make_error(this->location()); | |
10070 | } | |
b8e86a51 | 10071 | |
91c0fd76 | 10072 | if (this->is_flattened_) |
10073 | return this; | |
10074 | this->is_flattened_ = true; | |
10075 | ||
b8e86a51 | 10076 | // Add temporary variables for all arguments that require type |
10077 | // conversion. | |
10078 | Function_type* fntype = this->get_function_type(); | |
9782d556 | 10079 | if (fntype == NULL) |
10080 | { | |
10081 | go_assert(saw_errors()); | |
10082 | return this; | |
10083 | } | |
b8e86a51 | 10084 | if (this->args_ != NULL && !this->args_->empty() |
10085 | && fntype->parameters() != NULL && !fntype->parameters()->empty()) | |
10086 | { | |
10087 | bool is_interface_method = | |
10088 | this->fn_->interface_field_reference_expression() != NULL; | |
10089 | ||
10090 | Expression_list *args = new Expression_list(); | |
10091 | Typed_identifier_list::const_iterator pp = fntype->parameters()->begin(); | |
10092 | Expression_list::const_iterator pa = this->args_->begin(); | |
10093 | if (!is_interface_method && fntype->is_method()) | |
10094 | { | |
10095 | // The receiver argument. | |
10096 | args->push_back(*pa); | |
10097 | ++pa; | |
10098 | } | |
10099 | for (; pa != this->args_->end(); ++pa, ++pp) | |
10100 | { | |
10101 | go_assert(pp != fntype->parameters()->end()); | |
3a522dcc | 10102 | if (Type::are_identical(pp->type(), (*pa)->type(), |
10103 | Type::COMPARE_TAGS, NULL)) | |
b8e86a51 | 10104 | args->push_back(*pa); |
10105 | else | |
10106 | { | |
10107 | Location loc = (*pa)->location(); | |
8ba8cc87 | 10108 | Expression* arg = *pa; |
10109 | if (!arg->is_variable()) | |
10110 | { | |
10111 | Temporary_statement *temp = | |
10112 | Statement::make_temporary(NULL, arg, loc); | |
10113 | inserter->insert(temp); | |
10114 | arg = Expression::make_temporary_reference(temp, loc); | |
10115 | } | |
10116 | arg = Expression::convert_for_assignment(gogo, pp->type(), arg, | |
10117 | loc); | |
10118 | args->push_back(arg); | |
b8e86a51 | 10119 | } |
10120 | } | |
10121 | delete this->args_; | |
10122 | this->args_ = args; | |
10123 | } | |
10124 | ||
2c809f8f | 10125 | return this; |
10126 | } | |
10127 | ||
ceeb4318 | 10128 | // Get the function type. This can return NULL in error cases. |
e440a328 | 10129 | |
10130 | Function_type* | |
10131 | Call_expression::get_function_type() const | |
10132 | { | |
10133 | return this->fn_->type()->function_type(); | |
10134 | } | |
10135 | ||
10136 | // Return the number of values which this call will return. | |
10137 | ||
10138 | size_t | |
10139 | Call_expression::result_count() const | |
10140 | { | |
10141 | const Function_type* fntype = this->get_function_type(); | |
10142 | if (fntype == NULL) | |
10143 | return 0; | |
10144 | if (fntype->results() == NULL) | |
10145 | return 0; | |
10146 | return fntype->results()->size(); | |
10147 | } | |
10148 | ||
5731103c | 10149 | // Return the temporary that holds the result for a call with multiple |
10150 | // results. | |
ceeb4318 | 10151 | |
10152 | Temporary_statement* | |
5731103c | 10153 | Call_expression::results() const |
ceeb4318 | 10154 | { |
5731103c | 10155 | if (this->call_temp_ == NULL) |
cd238b8d | 10156 | { |
10157 | go_assert(saw_errors()); | |
10158 | return NULL; | |
10159 | } | |
5731103c | 10160 | return this->call_temp_; |
ceeb4318 | 10161 | } |
10162 | ||
1373401e | 10163 | // Set the number of results expected from a call expression. |
10164 | ||
10165 | void | |
10166 | Call_expression::set_expected_result_count(size_t count) | |
10167 | { | |
10168 | go_assert(this->expected_result_count_ == 0); | |
10169 | this->expected_result_count_ = count; | |
10170 | } | |
10171 | ||
e440a328 | 10172 | // Return whether this is a call to the predeclared function recover. |
10173 | ||
10174 | bool | |
10175 | Call_expression::is_recover_call() const | |
10176 | { | |
10177 | return this->do_is_recover_call(); | |
10178 | } | |
10179 | ||
10180 | // Set the argument to the recover function. | |
10181 | ||
10182 | void | |
10183 | Call_expression::set_recover_arg(Expression* arg) | |
10184 | { | |
10185 | this->do_set_recover_arg(arg); | |
10186 | } | |
10187 | ||
10188 | // Virtual functions also implemented by Builtin_call_expression. | |
10189 | ||
10190 | bool | |
10191 | Call_expression::do_is_recover_call() const | |
10192 | { | |
10193 | return false; | |
10194 | } | |
10195 | ||
10196 | void | |
10197 | Call_expression::do_set_recover_arg(Expression*) | |
10198 | { | |
c3e6f413 | 10199 | go_unreachable(); |
e440a328 | 10200 | } |
10201 | ||
ceeb4318 | 10202 | // We have found an error with this call expression; return true if |
10203 | // we should report it. | |
10204 | ||
10205 | bool | |
10206 | Call_expression::issue_error() | |
10207 | { | |
10208 | if (this->issued_error_) | |
10209 | return false; | |
10210 | else | |
10211 | { | |
10212 | this->issued_error_ = true; | |
10213 | return true; | |
10214 | } | |
10215 | } | |
10216 | ||
5bf8be8b | 10217 | // Whether or not this call contains errors, either in the call or the |
10218 | // arguments to the call. | |
10219 | ||
10220 | bool | |
10221 | Call_expression::is_erroneous_call() | |
10222 | { | |
10223 | if (this->is_error_expression() || this->fn()->is_error_expression()) | |
10224 | return true; | |
10225 | ||
10226 | if (this->args() == NULL) | |
10227 | return false; | |
10228 | for (Expression_list::iterator pa = this->args()->begin(); | |
10229 | pa != this->args()->end(); | |
10230 | ++pa) | |
10231 | { | |
10232 | if ((*pa)->type()->is_error_type() || (*pa)->is_error_expression()) | |
10233 | return true; | |
10234 | } | |
10235 | return false; | |
10236 | } | |
10237 | ||
e440a328 | 10238 | // Get the type. |
10239 | ||
10240 | Type* | |
10241 | Call_expression::do_type() | |
10242 | { | |
10243 | if (this->type_ != NULL) | |
10244 | return this->type_; | |
10245 | ||
10246 | Type* ret; | |
10247 | Function_type* fntype = this->get_function_type(); | |
10248 | if (fntype == NULL) | |
10249 | return Type::make_error_type(); | |
10250 | ||
10251 | const Typed_identifier_list* results = fntype->results(); | |
10252 | if (results == NULL) | |
10253 | ret = Type::make_void_type(); | |
10254 | else if (results->size() == 1) | |
10255 | ret = results->begin()->type(); | |
10256 | else | |
2801343b | 10257 | ret = Type::make_call_multiple_result_type(this); |
e440a328 | 10258 | |
10259 | this->type_ = ret; | |
10260 | ||
10261 | return this->type_; | |
10262 | } | |
10263 | ||
10264 | // Determine types for a call expression. We can use the function | |
10265 | // parameter types to set the types of the arguments. | |
10266 | ||
10267 | void | |
10268 | Call_expression::do_determine_type(const Type_context*) | |
10269 | { | |
fb94b0ca | 10270 | if (!this->determining_types()) |
10271 | return; | |
10272 | ||
e440a328 | 10273 | this->fn_->determine_type_no_context(); |
10274 | Function_type* fntype = this->get_function_type(); | |
10275 | const Typed_identifier_list* parameters = NULL; | |
10276 | if (fntype != NULL) | |
10277 | parameters = fntype->parameters(); | |
10278 | if (this->args_ != NULL) | |
10279 | { | |
10280 | Typed_identifier_list::const_iterator pt; | |
10281 | if (parameters != NULL) | |
10282 | pt = parameters->begin(); | |
09ea332d | 10283 | bool first = true; |
e440a328 | 10284 | for (Expression_list::const_iterator pa = this->args_->begin(); |
10285 | pa != this->args_->end(); | |
10286 | ++pa) | |
10287 | { | |
09ea332d | 10288 | if (first) |
10289 | { | |
10290 | first = false; | |
10291 | // If this is a method, the first argument is the | |
10292 | // receiver. | |
10293 | if (fntype != NULL && fntype->is_method()) | |
10294 | { | |
10295 | Type* rtype = fntype->receiver()->type(); | |
10296 | // The receiver is always passed as a pointer. | |
10297 | if (rtype->points_to() == NULL) | |
10298 | rtype = Type::make_pointer_type(rtype); | |
10299 | Type_context subcontext(rtype, false); | |
10300 | (*pa)->determine_type(&subcontext); | |
10301 | continue; | |
10302 | } | |
10303 | } | |
10304 | ||
e440a328 | 10305 | if (parameters != NULL && pt != parameters->end()) |
10306 | { | |
10307 | Type_context subcontext(pt->type(), false); | |
10308 | (*pa)->determine_type(&subcontext); | |
10309 | ++pt; | |
10310 | } | |
10311 | else | |
10312 | (*pa)->determine_type_no_context(); | |
10313 | } | |
10314 | } | |
10315 | } | |
10316 | ||
fb94b0ca | 10317 | // Called when determining types for a Call_expression. Return true |
10318 | // if we should go ahead, false if they have already been determined. | |
10319 | ||
10320 | bool | |
10321 | Call_expression::determining_types() | |
10322 | { | |
10323 | if (this->types_are_determined_) | |
10324 | return false; | |
10325 | else | |
10326 | { | |
10327 | this->types_are_determined_ = true; | |
10328 | return true; | |
10329 | } | |
10330 | } | |
10331 | ||
e440a328 | 10332 | // Check types for parameter I. |
10333 | ||
10334 | bool | |
10335 | Call_expression::check_argument_type(int i, const Type* parameter_type, | |
10336 | const Type* argument_type, | |
b13c66cd | 10337 | Location argument_location, |
e440a328 | 10338 | bool issued_error) |
10339 | { | |
10340 | std::string reason; | |
1eae365b | 10341 | if (!Type::are_assignable(parameter_type, argument_type, &reason)) |
e440a328 | 10342 | { |
10343 | if (!issued_error) | |
10344 | { | |
10345 | if (reason.empty()) | |
631d5788 | 10346 | go_error_at(argument_location, "argument %d has incompatible type", i); |
e440a328 | 10347 | else |
631d5788 | 10348 | go_error_at(argument_location, |
10349 | "argument %d has incompatible type (%s)", | |
10350 | i, reason.c_str()); | |
e440a328 | 10351 | } |
10352 | this->set_is_error(); | |
10353 | return false; | |
10354 | } | |
10355 | return true; | |
10356 | } | |
10357 | ||
10358 | // Check types. | |
10359 | ||
10360 | void | |
10361 | Call_expression::do_check_types(Gogo*) | |
10362 | { | |
a6645f74 | 10363 | if (this->classification() == EXPRESSION_ERROR) |
10364 | return; | |
10365 | ||
e440a328 | 10366 | Function_type* fntype = this->get_function_type(); |
10367 | if (fntype == NULL) | |
10368 | { | |
5c13bd80 | 10369 | if (!this->fn_->type()->is_error()) |
e440a328 | 10370 | this->report_error(_("expected function")); |
10371 | return; | |
10372 | } | |
10373 | ||
1373401e | 10374 | if (this->expected_result_count_ != 0 |
10375 | && this->expected_result_count_ != this->result_count()) | |
10376 | { | |
10377 | if (this->issue_error()) | |
10378 | this->report_error(_("function result count mismatch")); | |
10379 | this->set_is_error(); | |
10380 | return; | |
10381 | } | |
10382 | ||
09ea332d | 10383 | bool is_method = fntype->is_method(); |
10384 | if (is_method) | |
e440a328 | 10385 | { |
09ea332d | 10386 | go_assert(this->args_ != NULL && !this->args_->empty()); |
10387 | Type* rtype = fntype->receiver()->type(); | |
10388 | Expression* first_arg = this->args_->front(); | |
1eae365b | 10389 | // We dereference the values since receivers are always passed |
10390 | // as pointers. | |
09ea332d | 10391 | std::string reason; |
1eae365b | 10392 | if (!Type::are_assignable(rtype->deref(), first_arg->type()->deref(), |
10393 | &reason)) | |
e440a328 | 10394 | { |
09ea332d | 10395 | if (reason.empty()) |
10396 | this->report_error(_("incompatible type for receiver")); | |
10397 | else | |
e440a328 | 10398 | { |
631d5788 | 10399 | go_error_at(this->location(), |
10400 | "incompatible type for receiver (%s)", | |
10401 | reason.c_str()); | |
09ea332d | 10402 | this->set_is_error(); |
e440a328 | 10403 | } |
10404 | } | |
10405 | } | |
10406 | ||
10407 | // Note that varargs was handled by the lower_varargs() method, so | |
a6645f74 | 10408 | // we don't have to worry about it here unless something is wrong. |
10409 | if (this->is_varargs_ && !this->varargs_are_lowered_) | |
10410 | { | |
10411 | if (!fntype->is_varargs()) | |
10412 | { | |
631d5788 | 10413 | go_error_at(this->location(), |
10414 | _("invalid use of %<...%> calling non-variadic function")); | |
a6645f74 | 10415 | this->set_is_error(); |
10416 | return; | |
10417 | } | |
10418 | } | |
e440a328 | 10419 | |
10420 | const Typed_identifier_list* parameters = fntype->parameters(); | |
33d1d391 | 10421 | if (this->args_ == NULL || this->args_->size() == 0) |
e440a328 | 10422 | { |
10423 | if (parameters != NULL && !parameters->empty()) | |
10424 | this->report_error(_("not enough arguments")); | |
10425 | } | |
10426 | else if (parameters == NULL) | |
09ea332d | 10427 | { |
10428 | if (!is_method || this->args_->size() > 1) | |
10429 | this->report_error(_("too many arguments")); | |
10430 | } | |
1373401e | 10431 | else if (this->args_->size() == 1 |
10432 | && this->args_->front()->call_expression() != NULL | |
10433 | && this->args_->front()->call_expression()->result_count() > 1) | |
10434 | { | |
10435 | // This is F(G()) when G returns more than one result. If the | |
10436 | // results can be matched to parameters, it would have been | |
10437 | // lowered in do_lower. If we get here we know there is a | |
10438 | // mismatch. | |
10439 | if (this->args_->front()->call_expression()->result_count() | |
10440 | < parameters->size()) | |
10441 | this->report_error(_("not enough arguments")); | |
10442 | else | |
10443 | this->report_error(_("too many arguments")); | |
10444 | } | |
e440a328 | 10445 | else |
10446 | { | |
10447 | int i = 0; | |
09ea332d | 10448 | Expression_list::const_iterator pa = this->args_->begin(); |
10449 | if (is_method) | |
10450 | ++pa; | |
10451 | for (Typed_identifier_list::const_iterator pt = parameters->begin(); | |
10452 | pt != parameters->end(); | |
10453 | ++pt, ++pa, ++i) | |
e440a328 | 10454 | { |
09ea332d | 10455 | if (pa == this->args_->end()) |
e440a328 | 10456 | { |
09ea332d | 10457 | this->report_error(_("not enough arguments")); |
e440a328 | 10458 | return; |
10459 | } | |
10460 | this->check_argument_type(i + 1, pt->type(), (*pa)->type(), | |
10461 | (*pa)->location(), false); | |
10462 | } | |
09ea332d | 10463 | if (pa != this->args_->end()) |
10464 | this->report_error(_("too many arguments")); | |
e440a328 | 10465 | } |
10466 | } | |
10467 | ||
72666aed | 10468 | Expression* |
10469 | Call_expression::do_copy() | |
10470 | { | |
10471 | Call_expression* call = | |
10472 | Expression::make_call(this->fn_->copy(), | |
10473 | (this->args_ == NULL | |
10474 | ? NULL | |
10475 | : this->args_->copy()), | |
10476 | this->is_varargs_, this->location()); | |
10477 | ||
10478 | if (this->varargs_are_lowered_) | |
10479 | call->set_varargs_are_lowered(); | |
28819633 | 10480 | if (this->is_deferred_) |
10481 | call->set_is_deferred(); | |
10482 | if (this->is_concurrent_) | |
10483 | call->set_is_concurrent(); | |
72666aed | 10484 | return call; |
10485 | } | |
10486 | ||
e440a328 | 10487 | // Return whether we have to use a temporary variable to ensure that |
10488 | // we evaluate this call expression in order. If the call returns no | |
ceeb4318 | 10489 | // results then it will inevitably be executed last. |
e440a328 | 10490 | |
10491 | bool | |
10492 | Call_expression::do_must_eval_in_order() const | |
10493 | { | |
ceeb4318 | 10494 | return this->result_count() > 0; |
e440a328 | 10495 | } |
10496 | ||
e440a328 | 10497 | // Get the function and the first argument to use when calling an |
10498 | // interface method. | |
10499 | ||
2387f644 | 10500 | Expression* |
e440a328 | 10501 | Call_expression::interface_method_function( |
e440a328 | 10502 | Interface_field_reference_expression* interface_method, |
db122cb9 | 10503 | Expression** first_arg_ptr, |
10504 | Location location) | |
e440a328 | 10505 | { |
db122cb9 | 10506 | Expression* object = interface_method->get_underlying_object(); |
10507 | Type* unsafe_ptr_type = Type::make_pointer_type(Type::make_void_type()); | |
10508 | *first_arg_ptr = | |
10509 | Expression::make_unsafe_cast(unsafe_ptr_type, object, location); | |
2387f644 | 10510 | return interface_method->get_function(); |
e440a328 | 10511 | } |
10512 | ||
10513 | // Build the call expression. | |
10514 | ||
ea664253 | 10515 | Bexpression* |
10516 | Call_expression::do_get_backend(Translate_context* context) | |
e440a328 | 10517 | { |
5731103c | 10518 | Location location = this->location(); |
10519 | ||
2c809f8f | 10520 | if (this->call_ != NULL) |
5731103c | 10521 | { |
10522 | // If the call returns multiple results, make a new reference to | |
10523 | // the temporary. | |
10524 | if (this->call_temp_ != NULL) | |
10525 | { | |
10526 | Expression* ref = | |
10527 | Expression::make_temporary_reference(this->call_temp_, location); | |
10528 | return ref->get_backend(context); | |
10529 | } | |
10530 | ||
10531 | return this->call_; | |
10532 | } | |
e440a328 | 10533 | |
10534 | Function_type* fntype = this->get_function_type(); | |
10535 | if (fntype == NULL) | |
ea664253 | 10536 | return context->backend()->error_expression(); |
e440a328 | 10537 | |
10538 | if (this->fn_->is_error_expression()) | |
ea664253 | 10539 | return context->backend()->error_expression(); |
e440a328 | 10540 | |
10541 | Gogo* gogo = context->gogo(); | |
e440a328 | 10542 | |
10543 | Func_expression* func = this->fn_->func_expression(); | |
e440a328 | 10544 | Interface_field_reference_expression* interface_method = |
10545 | this->fn_->interface_field_reference_expression(); | |
10546 | const bool has_closure = func != NULL && func->closure() != NULL; | |
09ea332d | 10547 | const bool is_interface_method = interface_method != NULL; |
e440a328 | 10548 | |
f8bdf81a | 10549 | bool has_closure_arg; |
8381eda7 | 10550 | if (has_closure) |
f8bdf81a | 10551 | has_closure_arg = true; |
8381eda7 | 10552 | else if (func != NULL) |
f8bdf81a | 10553 | has_closure_arg = false; |
8381eda7 | 10554 | else if (is_interface_method) |
f8bdf81a | 10555 | has_closure_arg = false; |
8381eda7 | 10556 | else |
f8bdf81a | 10557 | has_closure_arg = true; |
8381eda7 | 10558 | |
e440a328 | 10559 | int nargs; |
2c809f8f | 10560 | std::vector<Bexpression*> fn_args; |
e440a328 | 10561 | if (this->args_ == NULL || this->args_->empty()) |
10562 | { | |
f8bdf81a | 10563 | nargs = is_interface_method ? 1 : 0; |
2c809f8f | 10564 | if (nargs > 0) |
10565 | fn_args.resize(1); | |
e440a328 | 10566 | } |
09ea332d | 10567 | else if (fntype->parameters() == NULL || fntype->parameters()->empty()) |
10568 | { | |
10569 | // Passing a receiver parameter. | |
10570 | go_assert(!is_interface_method | |
10571 | && fntype->is_method() | |
10572 | && this->args_->size() == 1); | |
f8bdf81a | 10573 | nargs = 1; |
2c809f8f | 10574 | fn_args.resize(1); |
ea664253 | 10575 | fn_args[0] = this->args_->front()->get_backend(context); |
09ea332d | 10576 | } |
e440a328 | 10577 | else |
10578 | { | |
10579 | const Typed_identifier_list* params = fntype->parameters(); | |
e440a328 | 10580 | |
10581 | nargs = this->args_->size(); | |
09ea332d | 10582 | int i = is_interface_method ? 1 : 0; |
e440a328 | 10583 | nargs += i; |
2c809f8f | 10584 | fn_args.resize(nargs); |
e440a328 | 10585 | |
10586 | Typed_identifier_list::const_iterator pp = params->begin(); | |
09ea332d | 10587 | Expression_list::const_iterator pe = this->args_->begin(); |
10588 | if (!is_interface_method && fntype->is_method()) | |
10589 | { | |
ea664253 | 10590 | fn_args[i] = (*pe)->get_backend(context); |
09ea332d | 10591 | ++pe; |
10592 | ++i; | |
10593 | } | |
10594 | for (; pe != this->args_->end(); ++pe, ++pp, ++i) | |
e440a328 | 10595 | { |
c484d925 | 10596 | go_assert(pp != params->end()); |
2c809f8f | 10597 | Expression* arg = |
10598 | Expression::convert_for_assignment(gogo, pp->type(), *pe, | |
10599 | location); | |
ea664253 | 10600 | fn_args[i] = arg->get_backend(context); |
e440a328 | 10601 | } |
c484d925 | 10602 | go_assert(pp == params->end()); |
f8bdf81a | 10603 | go_assert(i == nargs); |
e440a328 | 10604 | } |
10605 | ||
2c809f8f | 10606 | Expression* fn; |
10607 | Expression* closure = NULL; | |
8381eda7 | 10608 | if (func != NULL) |
10609 | { | |
10610 | Named_object* no = func->named_object(); | |
2c809f8f | 10611 | fn = Expression::make_func_code_reference(no, location); |
10612 | if (has_closure) | |
10613 | closure = func->closure(); | |
8381eda7 | 10614 | } |
09ea332d | 10615 | else if (!is_interface_method) |
8381eda7 | 10616 | { |
2c809f8f | 10617 | closure = this->fn_; |
10618 | ||
10619 | // The backend representation of this function type is a pointer | |
10620 | // to a struct whose first field is the actual function to call. | |
10621 | Type* pfntype = | |
10622 | Type::make_pointer_type( | |
10623 | Type::make_pointer_type(Type::make_void_type())); | |
10624 | fn = Expression::make_unsafe_cast(pfntype, this->fn_, location); | |
f614ea8b | 10625 | fn = Expression::make_dereference(fn, NIL_CHECK_NOT_NEEDED, location); |
2c809f8f | 10626 | } |
e440a328 | 10627 | else |
cf609de4 | 10628 | { |
2387f644 | 10629 | Expression* first_arg; |
db122cb9 | 10630 | fn = this->interface_method_function(interface_method, &first_arg, |
10631 | location); | |
ea664253 | 10632 | fn_args[0] = first_arg->get_backend(context); |
e440a328 | 10633 | } |
10634 | ||
1ecc6157 | 10635 | Bexpression* bclosure = NULL; |
10636 | if (has_closure_arg) | |
10637 | bclosure = closure->get_backend(context); | |
f8bdf81a | 10638 | else |
1ecc6157 | 10639 | go_assert(closure == NULL); |
f8bdf81a | 10640 | |
ea664253 | 10641 | Bexpression* bfn = fn->get_backend(context); |
80d1e1a8 | 10642 | |
10643 | // When not calling a named function directly, use a type conversion | |
10644 | // in case the type of the function is a recursive type which refers | |
10645 | // to itself. We don't do this for an interface method because 1) | |
10646 | // an interface method never refers to itself, so we always have a | |
10647 | // function type here; 2) we pass an extra first argument to an | |
10648 | // interface method, so fntype is not correct. | |
10649 | if (func == NULL && !is_interface_method) | |
10650 | { | |
10651 | Btype* bft = fntype->get_backend_fntype(gogo); | |
10652 | bfn = gogo->backend()->convert_expression(bft, bfn, location); | |
10653 | } | |
10654 | ||
4ced7af9 | 10655 | Bfunction* bfunction = NULL; |
10656 | if (context->function()) | |
10657 | bfunction = context->function()->func_value()->get_decl(); | |
10658 | Bexpression* call = gogo->backend()->call_expression(bfunction, bfn, | |
10659 | fn_args, bclosure, | |
10660 | location); | |
e440a328 | 10661 | |
5731103c | 10662 | if (this->call_temp_ != NULL) |
e440a328 | 10663 | { |
5731103c | 10664 | // This case occurs when the call returns multiple results. |
e440a328 | 10665 | |
5731103c | 10666 | Expression* ref = Expression::make_temporary_reference(this->call_temp_, |
10667 | location); | |
10668 | Bexpression* bref = ref->get_backend(context); | |
10669 | Bstatement* bassn = gogo->backend()->assignment_statement(bfunction, | |
10670 | bref, call, | |
10671 | location); | |
e440a328 | 10672 | |
5731103c | 10673 | ref = Expression::make_temporary_reference(this->call_temp_, location); |
10674 | this->call_ = ref->get_backend(context); | |
10675 | ||
10676 | return gogo->backend()->compound_expression(bassn, this->call_, | |
10677 | location); | |
2c809f8f | 10678 | } |
e440a328 | 10679 | |
2c809f8f | 10680 | this->call_ = call; |
ea664253 | 10681 | return this->call_; |
e440a328 | 10682 | } |
10683 | ||
d751bb78 | 10684 | // Dump ast representation for a call expressin. |
10685 | ||
10686 | void | |
10687 | Call_expression::do_dump_expression(Ast_dump_context* ast_dump_context) const | |
10688 | { | |
10689 | this->fn_->dump_expression(ast_dump_context); | |
10690 | ast_dump_context->ostream() << "("; | |
10691 | if (args_ != NULL) | |
10692 | ast_dump_context->dump_expression_list(this->args_); | |
10693 | ||
10694 | ast_dump_context->ostream() << ") "; | |
10695 | } | |
10696 | ||
e440a328 | 10697 | // Make a call expression. |
10698 | ||
10699 | Call_expression* | |
10700 | Expression::make_call(Expression* fn, Expression_list* args, bool is_varargs, | |
b13c66cd | 10701 | Location location) |
e440a328 | 10702 | { |
10703 | return new Call_expression(fn, args, is_varargs, location); | |
10704 | } | |
10705 | ||
da244e59 | 10706 | // Class Call_result_expression. |
e440a328 | 10707 | |
10708 | // Traverse a call result. | |
10709 | ||
10710 | int | |
10711 | Call_result_expression::do_traverse(Traverse* traverse) | |
10712 | { | |
10713 | if (traverse->remember_expression(this->call_)) | |
10714 | { | |
10715 | // We have already traversed the call expression. | |
10716 | return TRAVERSE_CONTINUE; | |
10717 | } | |
10718 | return Expression::traverse(&this->call_, traverse); | |
10719 | } | |
10720 | ||
10721 | // Get the type. | |
10722 | ||
10723 | Type* | |
10724 | Call_result_expression::do_type() | |
10725 | { | |
425dd051 | 10726 | if (this->classification() == EXPRESSION_ERROR) |
10727 | return Type::make_error_type(); | |
10728 | ||
e440a328 | 10729 | // THIS->CALL_ can be replaced with a temporary reference due to |
10730 | // Call_expression::do_must_eval_in_order when there is an error. | |
10731 | Call_expression* ce = this->call_->call_expression(); | |
10732 | if (ce == NULL) | |
5e85f268 | 10733 | { |
10734 | this->set_is_error(); | |
10735 | return Type::make_error_type(); | |
10736 | } | |
e440a328 | 10737 | Function_type* fntype = ce->get_function_type(); |
10738 | if (fntype == NULL) | |
5e85f268 | 10739 | { |
e37658e2 | 10740 | if (ce->issue_error()) |
99b3f06f | 10741 | { |
10742 | if (!ce->fn()->type()->is_error()) | |
10743 | this->report_error(_("expected function")); | |
10744 | } | |
5e85f268 | 10745 | this->set_is_error(); |
10746 | return Type::make_error_type(); | |
10747 | } | |
e440a328 | 10748 | const Typed_identifier_list* results = fntype->results(); |
ceeb4318 | 10749 | if (results == NULL || results->size() < 2) |
7b8d861f | 10750 | { |
ceeb4318 | 10751 | if (ce->issue_error()) |
10752 | this->report_error(_("number of results does not match " | |
10753 | "number of values")); | |
7b8d861f | 10754 | return Type::make_error_type(); |
10755 | } | |
e440a328 | 10756 | Typed_identifier_list::const_iterator pr = results->begin(); |
10757 | for (unsigned int i = 0; i < this->index_; ++i) | |
10758 | { | |
10759 | if (pr == results->end()) | |
425dd051 | 10760 | break; |
e440a328 | 10761 | ++pr; |
10762 | } | |
10763 | if (pr == results->end()) | |
425dd051 | 10764 | { |
ceeb4318 | 10765 | if (ce->issue_error()) |
10766 | this->report_error(_("number of results does not match " | |
10767 | "number of values")); | |
425dd051 | 10768 | return Type::make_error_type(); |
10769 | } | |
e440a328 | 10770 | return pr->type(); |
10771 | } | |
10772 | ||
425dd051 | 10773 | // Check the type. Just make sure that we trigger the warning in |
10774 | // do_type. | |
e440a328 | 10775 | |
10776 | void | |
10777 | Call_result_expression::do_check_types(Gogo*) | |
10778 | { | |
425dd051 | 10779 | this->type(); |
e440a328 | 10780 | } |
10781 | ||
10782 | // Determine the type. We have nothing to do here, but the 0 result | |
10783 | // needs to pass down to the caller. | |
10784 | ||
10785 | void | |
10786 | Call_result_expression::do_determine_type(const Type_context*) | |
10787 | { | |
fb94b0ca | 10788 | this->call_->determine_type_no_context(); |
e440a328 | 10789 | } |
10790 | ||
ea664253 | 10791 | // Return the backend representation. We just refer to the temporary set by the |
10792 | // call expression. We don't do this at lowering time because it makes it | |
ceeb4318 | 10793 | // hard to evaluate the call at the right time. |
e440a328 | 10794 | |
ea664253 | 10795 | Bexpression* |
10796 | Call_result_expression::do_get_backend(Translate_context* context) | |
e440a328 | 10797 | { |
ceeb4318 | 10798 | Call_expression* ce = this->call_->call_expression(); |
cd238b8d | 10799 | if (ce == NULL) |
10800 | { | |
10801 | go_assert(this->call_->is_error_expression()); | |
ea664253 | 10802 | return context->backend()->error_expression(); |
cd238b8d | 10803 | } |
5731103c | 10804 | Temporary_statement* ts = ce->results(); |
cd238b8d | 10805 | if (ts == NULL) |
10806 | { | |
10807 | go_assert(saw_errors()); | |
ea664253 | 10808 | return context->backend()->error_expression(); |
cd238b8d | 10809 | } |
ceeb4318 | 10810 | Expression* ref = Expression::make_temporary_reference(ts, this->location()); |
5731103c | 10811 | ref = Expression::make_field_reference(ref, this->index_, this->location()); |
ea664253 | 10812 | return ref->get_backend(context); |
e440a328 | 10813 | } |
10814 | ||
d751bb78 | 10815 | // Dump ast representation for a call result expression. |
10816 | ||
10817 | void | |
10818 | Call_result_expression::do_dump_expression(Ast_dump_context* ast_dump_context) | |
10819 | const | |
10820 | { | |
f03a9fbf | 10821 | // FIXME: Wouldn't it be better if the call is assigned to a temporary |
d751bb78 | 10822 | // (struct) and the fields are referenced instead. |
10823 | ast_dump_context->ostream() << this->index_ << "@("; | |
10824 | ast_dump_context->dump_expression(this->call_); | |
10825 | ast_dump_context->ostream() << ")"; | |
10826 | } | |
10827 | ||
e440a328 | 10828 | // Make a reference to a single result of a call which returns |
10829 | // multiple results. | |
10830 | ||
10831 | Expression* | |
10832 | Expression::make_call_result(Call_expression* call, unsigned int index) | |
10833 | { | |
10834 | return new Call_result_expression(call, index); | |
10835 | } | |
10836 | ||
10837 | // Class Index_expression. | |
10838 | ||
10839 | // Traversal. | |
10840 | ||
10841 | int | |
10842 | Index_expression::do_traverse(Traverse* traverse) | |
10843 | { | |
10844 | if (Expression::traverse(&this->left_, traverse) == TRAVERSE_EXIT | |
10845 | || Expression::traverse(&this->start_, traverse) == TRAVERSE_EXIT | |
10846 | || (this->end_ != NULL | |
acf2b673 | 10847 | && Expression::traverse(&this->end_, traverse) == TRAVERSE_EXIT) |
10848 | || (this->cap_ != NULL | |
10849 | && Expression::traverse(&this->cap_, traverse) == TRAVERSE_EXIT)) | |
e440a328 | 10850 | return TRAVERSE_EXIT; |
10851 | return TRAVERSE_CONTINUE; | |
10852 | } | |
10853 | ||
10854 | // Lower an index expression. This converts the generic index | |
10855 | // expression into an array index, a string index, or a map index. | |
10856 | ||
10857 | Expression* | |
ceeb4318 | 10858 | Index_expression::do_lower(Gogo*, Named_object*, Statement_inserter*, int) |
e440a328 | 10859 | { |
b13c66cd | 10860 | Location location = this->location(); |
e440a328 | 10861 | Expression* left = this->left_; |
10862 | Expression* start = this->start_; | |
10863 | Expression* end = this->end_; | |
acf2b673 | 10864 | Expression* cap = this->cap_; |
e440a328 | 10865 | |
10866 | Type* type = left->type(); | |
5c13bd80 | 10867 | if (type->is_error()) |
d9f3743a | 10868 | { |
10869 | go_assert(saw_errors()); | |
10870 | return Expression::make_error(location); | |
10871 | } | |
b0cf7ddd | 10872 | else if (left->is_type_expression()) |
10873 | { | |
631d5788 | 10874 | go_error_at(location, "attempt to index type expression"); |
b0cf7ddd | 10875 | return Expression::make_error(location); |
10876 | } | |
e440a328 | 10877 | else if (type->array_type() != NULL) |
acf2b673 | 10878 | return Expression::make_array_index(left, start, end, cap, location); |
e440a328 | 10879 | else if (type->points_to() != NULL |
10880 | && type->points_to()->array_type() != NULL | |
411eb89e | 10881 | && !type->points_to()->is_slice_type()) |
e440a328 | 10882 | { |
f614ea8b | 10883 | Expression* deref = |
10884 | Expression::make_dereference(left, NIL_CHECK_DEFAULT, location); | |
38092374 | 10885 | |
10886 | // For an ordinary index into the array, the pointer will be | |
10887 | // dereferenced. For a slice it will not--the resulting slice | |
10888 | // will simply reuse the pointer, which is incorrect if that | |
10889 | // pointer is nil. | |
10890 | if (end != NULL || cap != NULL) | |
10891 | deref->issue_nil_check(); | |
10892 | ||
acf2b673 | 10893 | return Expression::make_array_index(deref, start, end, cap, location); |
e440a328 | 10894 | } |
10895 | else if (type->is_string_type()) | |
acf2b673 | 10896 | { |
10897 | if (cap != NULL) | |
10898 | { | |
631d5788 | 10899 | go_error_at(location, "invalid 3-index slice of string"); |
acf2b673 | 10900 | return Expression::make_error(location); |
10901 | } | |
10902 | return Expression::make_string_index(left, start, end, location); | |
10903 | } | |
e440a328 | 10904 | else if (type->map_type() != NULL) |
10905 | { | |
acf2b673 | 10906 | if (end != NULL || cap != NULL) |
e440a328 | 10907 | { |
631d5788 | 10908 | go_error_at(location, "invalid slice of map"); |
e440a328 | 10909 | return Expression::make_error(location); |
10910 | } | |
0d5530d9 | 10911 | return Expression::make_map_index(left, start, location); |
e440a328 | 10912 | } |
b1aba207 | 10913 | else if (cap != NULL) |
10914 | { | |
10915 | go_error_at(location, | |
10916 | "invalid 3-index slice of object that is not a slice"); | |
10917 | return Expression::make_error(location); | |
10918 | } | |
10919 | else if (end != NULL) | |
10920 | { | |
10921 | go_error_at(location, | |
10922 | ("attempt to slice object that is not " | |
10923 | "array, slice, or string")); | |
10924 | return Expression::make_error(location); | |
10925 | } | |
e440a328 | 10926 | else |
10927 | { | |
631d5788 | 10928 | go_error_at(location, |
b1aba207 | 10929 | ("attempt to index object that is not " |
10930 | "array, slice, string, or map")); | |
e440a328 | 10931 | return Expression::make_error(location); |
10932 | } | |
10933 | } | |
10934 | ||
acf2b673 | 10935 | // Write an indexed expression |
10936 | // (expr[expr:expr:expr], expr[expr:expr] or expr[expr]) to a dump context. | |
d751bb78 | 10937 | |
10938 | void | |
f03a9fbf | 10939 | Index_expression::dump_index_expression(Ast_dump_context* ast_dump_context, |
10940 | const Expression* expr, | |
d751bb78 | 10941 | const Expression* start, |
acf2b673 | 10942 | const Expression* end, |
10943 | const Expression* cap) | |
d751bb78 | 10944 | { |
10945 | expr->dump_expression(ast_dump_context); | |
10946 | ast_dump_context->ostream() << "["; | |
10947 | start->dump_expression(ast_dump_context); | |
10948 | if (end != NULL) | |
10949 | { | |
10950 | ast_dump_context->ostream() << ":"; | |
10951 | end->dump_expression(ast_dump_context); | |
10952 | } | |
acf2b673 | 10953 | if (cap != NULL) |
10954 | { | |
10955 | ast_dump_context->ostream() << ":"; | |
10956 | cap->dump_expression(ast_dump_context); | |
10957 | } | |
d751bb78 | 10958 | ast_dump_context->ostream() << "]"; |
10959 | } | |
10960 | ||
10961 | // Dump ast representation for an index expression. | |
10962 | ||
10963 | void | |
f03a9fbf | 10964 | Index_expression::do_dump_expression(Ast_dump_context* ast_dump_context) |
d751bb78 | 10965 | const |
10966 | { | |
f03a9fbf | 10967 | Index_expression::dump_index_expression(ast_dump_context, this->left_, |
acf2b673 | 10968 | this->start_, this->end_, this->cap_); |
d751bb78 | 10969 | } |
10970 | ||
e440a328 | 10971 | // Make an index expression. |
10972 | ||
10973 | Expression* | |
10974 | Expression::make_index(Expression* left, Expression* start, Expression* end, | |
acf2b673 | 10975 | Expression* cap, Location location) |
e440a328 | 10976 | { |
acf2b673 | 10977 | return new Index_expression(left, start, end, cap, location); |
e440a328 | 10978 | } |
10979 | ||
da244e59 | 10980 | // Class Array_index_expression. |
e440a328 | 10981 | |
10982 | // Array index traversal. | |
10983 | ||
10984 | int | |
10985 | Array_index_expression::do_traverse(Traverse* traverse) | |
10986 | { | |
10987 | if (Expression::traverse(&this->array_, traverse) == TRAVERSE_EXIT) | |
10988 | return TRAVERSE_EXIT; | |
10989 | if (Expression::traverse(&this->start_, traverse) == TRAVERSE_EXIT) | |
10990 | return TRAVERSE_EXIT; | |
10991 | if (this->end_ != NULL) | |
10992 | { | |
10993 | if (Expression::traverse(&this->end_, traverse) == TRAVERSE_EXIT) | |
10994 | return TRAVERSE_EXIT; | |
10995 | } | |
acf2b673 | 10996 | if (this->cap_ != NULL) |
10997 | { | |
10998 | if (Expression::traverse(&this->cap_, traverse) == TRAVERSE_EXIT) | |
10999 | return TRAVERSE_EXIT; | |
11000 | } | |
e440a328 | 11001 | return TRAVERSE_CONTINUE; |
11002 | } | |
11003 | ||
11004 | // Return the type of an array index. | |
11005 | ||
11006 | Type* | |
11007 | Array_index_expression::do_type() | |
11008 | { | |
11009 | if (this->type_ == NULL) | |
11010 | { | |
11011 | Array_type* type = this->array_->type()->array_type(); | |
11012 | if (type == NULL) | |
11013 | this->type_ = Type::make_error_type(); | |
11014 | else if (this->end_ == NULL) | |
11015 | this->type_ = type->element_type(); | |
411eb89e | 11016 | else if (type->is_slice_type()) |
e440a328 | 11017 | { |
11018 | // A slice of a slice has the same type as the original | |
11019 | // slice. | |
11020 | this->type_ = this->array_->type()->deref(); | |
11021 | } | |
11022 | else | |
11023 | { | |
11024 | // A slice of an array is a slice. | |
11025 | this->type_ = Type::make_array_type(type->element_type(), NULL); | |
11026 | } | |
11027 | } | |
11028 | return this->type_; | |
11029 | } | |
11030 | ||
11031 | // Set the type of an array index. | |
11032 | ||
11033 | void | |
11034 | Array_index_expression::do_determine_type(const Type_context*) | |
11035 | { | |
11036 | this->array_->determine_type_no_context(); | |
f77aa642 | 11037 | |
11038 | Type_context index_context(Type::lookup_integer_type("int"), false); | |
11039 | if (this->start_->is_constant()) | |
11040 | this->start_->determine_type(&index_context); | |
11041 | else | |
11042 | this->start_->determine_type_no_context(); | |
e440a328 | 11043 | if (this->end_ != NULL) |
f77aa642 | 11044 | { |
11045 | if (this->end_->is_constant()) | |
11046 | this->end_->determine_type(&index_context); | |
11047 | else | |
11048 | this->end_->determine_type_no_context(); | |
11049 | } | |
acf2b673 | 11050 | if (this->cap_ != NULL) |
f77aa642 | 11051 | { |
11052 | if (this->cap_->is_constant()) | |
11053 | this->cap_->determine_type(&index_context); | |
11054 | else | |
11055 | this->cap_->determine_type_no_context(); | |
11056 | } | |
e440a328 | 11057 | } |
11058 | ||
11059 | // Check types of an array index. | |
11060 | ||
11061 | void | |
b7327dbf | 11062 | Array_index_expression::do_check_types(Gogo*) |
e440a328 | 11063 | { |
f6bc81e6 | 11064 | Numeric_constant nc; |
11065 | unsigned long v; | |
11066 | if (this->start_->type()->integer_type() == NULL | |
11067 | && !this->start_->type()->is_error() | |
11068 | && (!this->start_->numeric_constant_value(&nc) | |
11069 | || nc.to_unsigned_long(&v) == Numeric_constant::NC_UL_NOTINT)) | |
e440a328 | 11070 | this->report_error(_("index must be integer")); |
11071 | if (this->end_ != NULL | |
11072 | && this->end_->type()->integer_type() == NULL | |
99b3f06f | 11073 | && !this->end_->type()->is_error() |
11074 | && !this->end_->is_nil_expression() | |
f6bc81e6 | 11075 | && !this->end_->is_error_expression() |
11076 | && (!this->end_->numeric_constant_value(&nc) | |
11077 | || nc.to_unsigned_long(&v) == Numeric_constant::NC_UL_NOTINT)) | |
e440a328 | 11078 | this->report_error(_("slice end must be integer")); |
acf2b673 | 11079 | if (this->cap_ != NULL |
11080 | && this->cap_->type()->integer_type() == NULL | |
11081 | && !this->cap_->type()->is_error() | |
11082 | && !this->cap_->is_nil_expression() | |
11083 | && !this->cap_->is_error_expression() | |
11084 | && (!this->cap_->numeric_constant_value(&nc) | |
11085 | || nc.to_unsigned_long(&v) == Numeric_constant::NC_UL_NOTINT)) | |
11086 | this->report_error(_("slice capacity must be integer")); | |
e440a328 | 11087 | |
11088 | Array_type* array_type = this->array_->type()->array_type(); | |
f9c68f17 | 11089 | if (array_type == NULL) |
11090 | { | |
c484d925 | 11091 | go_assert(this->array_->type()->is_error()); |
f9c68f17 | 11092 | return; |
11093 | } | |
e440a328 | 11094 | |
11095 | unsigned int int_bits = | |
11096 | Type::lookup_integer_type("int")->integer_type()->bits(); | |
11097 | ||
0c77715b | 11098 | Numeric_constant lvalnc; |
e440a328 | 11099 | mpz_t lval; |
e440a328 | 11100 | bool lval_valid = (array_type->length() != NULL |
0c77715b | 11101 | && array_type->length()->numeric_constant_value(&lvalnc) |
11102 | && lvalnc.to_int(&lval)); | |
11103 | Numeric_constant inc; | |
e440a328 | 11104 | mpz_t ival; |
0bd5d859 | 11105 | bool ival_valid = false; |
0c77715b | 11106 | if (this->start_->numeric_constant_value(&inc) && inc.to_int(&ival)) |
e440a328 | 11107 | { |
0bd5d859 | 11108 | ival_valid = true; |
e440a328 | 11109 | if (mpz_sgn(ival) < 0 |
11110 | || mpz_sizeinbase(ival, 2) >= int_bits | |
11111 | || (lval_valid | |
11112 | && (this->end_ == NULL | |
11113 | ? mpz_cmp(ival, lval) >= 0 | |
11114 | : mpz_cmp(ival, lval) > 0))) | |
11115 | { | |
631d5788 | 11116 | go_error_at(this->start_->location(), "array index out of bounds"); |
e440a328 | 11117 | this->set_is_error(); |
11118 | } | |
11119 | } | |
11120 | if (this->end_ != NULL && !this->end_->is_nil_expression()) | |
11121 | { | |
0c77715b | 11122 | Numeric_constant enc; |
11123 | mpz_t eval; | |
acf2b673 | 11124 | bool eval_valid = false; |
0c77715b | 11125 | if (this->end_->numeric_constant_value(&enc) && enc.to_int(&eval)) |
e440a328 | 11126 | { |
acf2b673 | 11127 | eval_valid = true; |
0c77715b | 11128 | if (mpz_sgn(eval) < 0 |
11129 | || mpz_sizeinbase(eval, 2) >= int_bits | |
11130 | || (lval_valid && mpz_cmp(eval, lval) > 0)) | |
e440a328 | 11131 | { |
631d5788 | 11132 | go_error_at(this->end_->location(), "array index out of bounds"); |
e440a328 | 11133 | this->set_is_error(); |
11134 | } | |
0bd5d859 | 11135 | else if (ival_valid && mpz_cmp(ival, eval) > 0) |
11136 | this->report_error(_("inverted slice range")); | |
e440a328 | 11137 | } |
acf2b673 | 11138 | |
11139 | Numeric_constant cnc; | |
11140 | mpz_t cval; | |
11141 | if (this->cap_ != NULL | |
11142 | && this->cap_->numeric_constant_value(&cnc) && cnc.to_int(&cval)) | |
11143 | { | |
11144 | if (mpz_sgn(cval) < 0 | |
11145 | || mpz_sizeinbase(cval, 2) >= int_bits | |
11146 | || (lval_valid && mpz_cmp(cval, lval) > 0)) | |
11147 | { | |
631d5788 | 11148 | go_error_at(this->cap_->location(), "array index out of bounds"); |
acf2b673 | 11149 | this->set_is_error(); |
11150 | } | |
11151 | else if (ival_valid && mpz_cmp(ival, cval) > 0) | |
11152 | { | |
631d5788 | 11153 | go_error_at(this->cap_->location(), |
11154 | "invalid slice index: capacity less than start"); | |
acf2b673 | 11155 | this->set_is_error(); |
11156 | } | |
11157 | else if (eval_valid && mpz_cmp(eval, cval) > 0) | |
11158 | { | |
631d5788 | 11159 | go_error_at(this->cap_->location(), |
11160 | "invalid slice index: capacity less than length"); | |
acf2b673 | 11161 | this->set_is_error(); |
11162 | } | |
11163 | mpz_clear(cval); | |
11164 | } | |
11165 | ||
11166 | if (eval_valid) | |
11167 | mpz_clear(eval); | |
e440a328 | 11168 | } |
0bd5d859 | 11169 | if (ival_valid) |
11170 | mpz_clear(ival); | |
0c77715b | 11171 | if (lval_valid) |
11172 | mpz_clear(lval); | |
e440a328 | 11173 | |
11174 | // A slice of an array requires an addressable array. A slice of a | |
11175 | // slice is always possible. | |
411eb89e | 11176 | if (this->end_ != NULL && !array_type->is_slice_type()) |
88ec30c8 | 11177 | { |
11178 | if (!this->array_->is_addressable()) | |
8da39c3b | 11179 | this->report_error(_("slice of unaddressable value")); |
88ec30c8 | 11180 | else |
b7327dbf | 11181 | // Set the array address taken but not escape. The escape |
11182 | // analysis will make it escape to heap when needed. | |
11183 | this->array_->address_taken(false); | |
88ec30c8 | 11184 | } |
e440a328 | 11185 | } |
11186 | ||
71a38860 | 11187 | // The subexpressions of an array index must be evaluated in order. |
11188 | // If this is indexing into an array, rather than a slice, then only | |
11189 | // the index should be evaluated. Since this is called for values on | |
11190 | // the left hand side of an assigment, evaluating the array, meaning | |
11191 | // copying the array, will cause a different array to be modified. | |
11192 | ||
11193 | bool | |
11194 | Array_index_expression::do_must_eval_subexpressions_in_order( | |
11195 | int* skip) const | |
11196 | { | |
11197 | *skip = this->array_->type()->is_slice_type() ? 0 : 1; | |
11198 | return true; | |
11199 | } | |
11200 | ||
2c809f8f | 11201 | // Flatten array indexing by using temporary variables for slices and indexes. |
35a54f17 | 11202 | |
11203 | Expression* | |
11204 | Array_index_expression::do_flatten(Gogo*, Named_object*, | |
11205 | Statement_inserter* inserter) | |
11206 | { | |
11207 | Location loc = this->location(); | |
5bf8be8b | 11208 | Expression* array = this->array_; |
11209 | Expression* start = this->start_; | |
11210 | Expression* end = this->end_; | |
11211 | Expression* cap = this->cap_; | |
11212 | if (array->is_error_expression() | |
11213 | || array->type()->is_error_type() | |
11214 | || start->is_error_expression() | |
11215 | || start->type()->is_error_type() | |
11216 | || (end != NULL | |
11217 | && (end->is_error_expression() || end->type()->is_error_type())) | |
11218 | || (cap != NULL | |
11219 | && (cap->is_error_expression() || cap->type()->is_error_type()))) | |
11220 | { | |
11221 | go_assert(saw_errors()); | |
11222 | return Expression::make_error(loc); | |
11223 | } | |
11224 | ||
2c809f8f | 11225 | Temporary_statement* temp; |
5bf8be8b | 11226 | if (array->type()->is_slice_type() && !array->is_variable()) |
35a54f17 | 11227 | { |
5bf8be8b | 11228 | temp = Statement::make_temporary(NULL, array, loc); |
35a54f17 | 11229 | inserter->insert(temp); |
11230 | this->array_ = Expression::make_temporary_reference(temp, loc); | |
11231 | } | |
5bf8be8b | 11232 | if (!start->is_variable()) |
2c809f8f | 11233 | { |
5bf8be8b | 11234 | temp = Statement::make_temporary(NULL, start, loc); |
2c809f8f | 11235 | inserter->insert(temp); |
11236 | this->start_ = Expression::make_temporary_reference(temp, loc); | |
11237 | } | |
5bf8be8b | 11238 | if (end != NULL |
11239 | && !end->is_nil_expression() | |
11240 | && !end->is_variable()) | |
2c809f8f | 11241 | { |
5bf8be8b | 11242 | temp = Statement::make_temporary(NULL, end, loc); |
2c809f8f | 11243 | inserter->insert(temp); |
11244 | this->end_ = Expression::make_temporary_reference(temp, loc); | |
11245 | } | |
03118c21 | 11246 | if (cap != NULL && !cap->is_variable()) |
2c809f8f | 11247 | { |
5bf8be8b | 11248 | temp = Statement::make_temporary(NULL, cap, loc); |
2c809f8f | 11249 | inserter->insert(temp); |
11250 | this->cap_ = Expression::make_temporary_reference(temp, loc); | |
11251 | } | |
11252 | ||
35a54f17 | 11253 | return this; |
11254 | } | |
11255 | ||
e440a328 | 11256 | // Return whether this expression is addressable. |
11257 | ||
11258 | bool | |
11259 | Array_index_expression::do_is_addressable() const | |
11260 | { | |
11261 | // A slice expression is not addressable. | |
11262 | if (this->end_ != NULL) | |
11263 | return false; | |
11264 | ||
11265 | // An index into a slice is addressable. | |
411eb89e | 11266 | if (this->array_->type()->is_slice_type()) |
e440a328 | 11267 | return true; |
11268 | ||
11269 | // An index into an array is addressable if the array is | |
11270 | // addressable. | |
11271 | return this->array_->is_addressable(); | |
11272 | } | |
11273 | ||
bf1323be | 11274 | void |
11275 | Array_index_expression::do_address_taken(bool escapes) | |
11276 | { | |
11277 | // In &x[0], if x is a slice, then x's address is not taken. | |
11278 | if (!this->array_->type()->is_slice_type()) | |
11279 | this->array_->address_taken(escapes); | |
11280 | } | |
11281 | ||
ea664253 | 11282 | // Get the backend representation for an array index. |
e440a328 | 11283 | |
ea664253 | 11284 | Bexpression* |
11285 | Array_index_expression::do_get_backend(Translate_context* context) | |
e440a328 | 11286 | { |
e440a328 | 11287 | Array_type* array_type = this->array_->type()->array_type(); |
d8cd8e2d | 11288 | if (array_type == NULL) |
11289 | { | |
c484d925 | 11290 | go_assert(this->array_->type()->is_error()); |
ea664253 | 11291 | return context->backend()->error_expression(); |
d8cd8e2d | 11292 | } |
35a54f17 | 11293 | go_assert(!array_type->is_slice_type() || this->array_->is_variable()); |
e440a328 | 11294 | |
2c809f8f | 11295 | Location loc = this->location(); |
11296 | Gogo* gogo = context->gogo(); | |
11297 | ||
6dfedc16 | 11298 | Type* int_type = Type::lookup_integer_type("int"); |
11299 | Btype* int_btype = int_type->get_backend(gogo); | |
e440a328 | 11300 | |
2c809f8f | 11301 | // We need to convert the length and capacity to the Go "int" type here |
11302 | // because the length of a fixed-length array could be of type "uintptr" | |
11303 | // and gimple disallows binary operations between "uintptr" and other | |
11304 | // integer types. FIXME. | |
11305 | Bexpression* length = NULL; | |
a04bfdfc | 11306 | if (this->end_ == NULL || this->end_->is_nil_expression()) |
11307 | { | |
35a54f17 | 11308 | Expression* len = array_type->get_length(gogo, this->array_); |
ea664253 | 11309 | length = len->get_backend(context); |
2c809f8f | 11310 | length = gogo->backend()->convert_expression(int_btype, length, loc); |
a04bfdfc | 11311 | } |
11312 | ||
2c809f8f | 11313 | Bexpression* capacity = NULL; |
a04bfdfc | 11314 | if (this->end_ != NULL) |
11315 | { | |
35a54f17 | 11316 | Expression* cap = array_type->get_capacity(gogo, this->array_); |
ea664253 | 11317 | capacity = cap->get_backend(context); |
2c809f8f | 11318 | capacity = gogo->backend()->convert_expression(int_btype, capacity, loc); |
a04bfdfc | 11319 | } |
11320 | ||
2c809f8f | 11321 | Bexpression* cap_arg = capacity; |
acf2b673 | 11322 | if (this->cap_ != NULL) |
11323 | { | |
ea664253 | 11324 | cap_arg = this->cap_->get_backend(context); |
2c809f8f | 11325 | cap_arg = gogo->backend()->convert_expression(int_btype, cap_arg, loc); |
acf2b673 | 11326 | } |
11327 | ||
2c809f8f | 11328 | if (length == NULL) |
11329 | length = cap_arg; | |
e440a328 | 11330 | |
6dfedc16 | 11331 | if (this->start_->type()->integer_type() == NULL |
11332 | && !Type::are_convertible(int_type, this->start_->type(), NULL)) | |
11333 | { | |
11334 | go_assert(saw_errors()); | |
11335 | return context->backend()->error_expression(); | |
11336 | } | |
d9f3743a | 11337 | |
ea664253 | 11338 | Bexpression* start = this->start_->get_backend(context); |
2c809f8f | 11339 | start = gogo->backend()->convert_expression(int_btype, start, loc); |
3d135120 | 11340 | |
11341 | Bexpression* crash = NULL; | |
11342 | Bexpression* bad_index = NULL; | |
11343 | if (this->needs_bounds_check_) | |
11344 | { | |
11345 | int code = (array_type->length() != NULL | |
11346 | ? (this->end_ == NULL | |
11347 | ? RUNTIME_ERROR_ARRAY_INDEX_OUT_OF_BOUNDS | |
11348 | : RUNTIME_ERROR_ARRAY_SLICE_OUT_OF_BOUNDS) | |
11349 | : (this->end_ == NULL | |
11350 | ? RUNTIME_ERROR_SLICE_INDEX_OUT_OF_BOUNDS | |
11351 | : RUNTIME_ERROR_SLICE_SLICE_OUT_OF_BOUNDS)); | |
11352 | crash = gogo->runtime_error(code, loc)->get_backend(context); | |
11353 | bad_index = Expression::check_bounds(this->start_, loc)->get_backend(context); | |
11354 | Bexpression* start_too_large = | |
11355 | gogo->backend()->binary_expression((this->end_ == NULL | |
11356 | ? OPERATOR_GE | |
11357 | : OPERATOR_GT), | |
11358 | start, | |
11359 | (this->end_ == NULL | |
11360 | ? length | |
11361 | : capacity), | |
11362 | loc); | |
11363 | bad_index = gogo->backend()->binary_expression(OPERATOR_OROR, | |
11364 | start_too_large, | |
11365 | bad_index, loc); | |
11366 | } | |
11367 | ||
e440a328 | 11368 | |
93715b75 | 11369 | Bfunction* bfn = context->function()->func_value()->get_decl(); |
e440a328 | 11370 | if (this->end_ == NULL) |
11371 | { | |
11372 | // Simple array indexing. This has to return an l-value, so | |
2c809f8f | 11373 | // wrap the index check into START. |
3d135120 | 11374 | if (this->needs_bounds_check_) |
11375 | start = | |
11376 | gogo->backend()->conditional_expression(bfn, int_btype, bad_index, | |
11377 | crash, start, loc); | |
e440a328 | 11378 | |
2c809f8f | 11379 | Bexpression* ret; |
e440a328 | 11380 | if (array_type->length() != NULL) |
11381 | { | |
ea664253 | 11382 | Bexpression* array = this->array_->get_backend(context); |
2c809f8f | 11383 | ret = gogo->backend()->array_index_expression(array, start, loc); |
e440a328 | 11384 | } |
11385 | else | |
11386 | { | |
2c809f8f | 11387 | // Slice. |
11388 | Expression* valptr = | |
44dbe1d7 | 11389 | array_type->get_value_pointer(gogo, this->array_, |
11390 | this->is_lvalue_); | |
ea664253 | 11391 | Bexpression* ptr = valptr->get_backend(context); |
2c809f8f | 11392 | ptr = gogo->backend()->pointer_offset_expression(ptr, start, loc); |
9b27b43c | 11393 | |
11394 | Type* ele_type = this->array_->type()->array_type()->element_type(); | |
11395 | Btype* ele_btype = ele_type->get_backend(gogo); | |
11396 | ret = gogo->backend()->indirect_expression(ele_btype, ptr, true, loc); | |
e440a328 | 11397 | } |
ea664253 | 11398 | return ret; |
e440a328 | 11399 | } |
11400 | ||
11401 | // Array slice. | |
11402 | ||
acf2b673 | 11403 | if (this->cap_ != NULL) |
11404 | { | |
2c809f8f | 11405 | cap_arg = gogo->backend()->convert_expression(int_btype, cap_arg, loc); |
11406 | ||
3d135120 | 11407 | if (this->needs_bounds_check_) |
11408 | { | |
11409 | Bexpression* bounds_bcheck = | |
11410 | Expression::check_bounds(this->cap_, loc)->get_backend(context); | |
11411 | bad_index = | |
11412 | gogo->backend()->binary_expression(OPERATOR_OROR, bounds_bcheck, | |
11413 | bad_index, loc); | |
11414 | ||
11415 | Bexpression* cap_too_small = | |
11416 | gogo->backend()->binary_expression(OPERATOR_LT, cap_arg, start, loc); | |
11417 | Bexpression* cap_too_large = | |
11418 | gogo->backend()->binary_expression(OPERATOR_GT, cap_arg, capacity, loc); | |
11419 | Bexpression* bad_cap = | |
11420 | gogo->backend()->binary_expression(OPERATOR_OROR, cap_too_small, | |
11421 | cap_too_large, loc); | |
11422 | bad_index = gogo->backend()->binary_expression(OPERATOR_OROR, bad_cap, | |
11423 | bad_index, loc); | |
11424 | } | |
2c809f8f | 11425 | } |
11426 | ||
11427 | Bexpression* end; | |
e440a328 | 11428 | if (this->end_->is_nil_expression()) |
2c809f8f | 11429 | end = length; |
e440a328 | 11430 | else |
11431 | { | |
ea664253 | 11432 | end = this->end_->get_backend(context); |
2c809f8f | 11433 | end = gogo->backend()->convert_expression(int_btype, end, loc); |
3d135120 | 11434 | if (this->needs_bounds_check_) |
11435 | { | |
11436 | Bexpression* bounds_bcheck = | |
11437 | Expression::check_bounds(this->end_, loc)->get_backend(context); | |
11438 | bad_index = | |
11439 | gogo->backend()->binary_expression(OPERATOR_OROR, bounds_bcheck, | |
11440 | bad_index, loc); | |
11441 | ||
11442 | Bexpression* end_too_small = | |
11443 | gogo->backend()->binary_expression(OPERATOR_LT, end, start, loc); | |
11444 | Bexpression* end_too_large = | |
11445 | gogo->backend()->binary_expression(OPERATOR_GT, end, cap_arg, loc); | |
11446 | Bexpression* bad_end = | |
11447 | gogo->backend()->binary_expression(OPERATOR_OROR, end_too_small, | |
11448 | end_too_large, loc); | |
11449 | bad_index = gogo->backend()->binary_expression(OPERATOR_OROR, bad_end, | |
11450 | bad_index, loc); | |
11451 | } | |
e440a328 | 11452 | } |
11453 | ||
2c809f8f | 11454 | Bexpression* result_length = |
11455 | gogo->backend()->binary_expression(OPERATOR_MINUS, end, start, loc); | |
e440a328 | 11456 | |
2c809f8f | 11457 | Bexpression* result_capacity = |
11458 | gogo->backend()->binary_expression(OPERATOR_MINUS, cap_arg, start, loc); | |
e440a328 | 11459 | |
03118c21 | 11460 | // If the new capacity is zero, don't change val. Otherwise we can |
11461 | // get a pointer to the next object in memory, keeping it live | |
11462 | // unnecessarily. When the capacity is zero, the actual pointer | |
11463 | // value doesn't matter. | |
11464 | Bexpression* zero = | |
11465 | Expression::make_integer_ul(0, int_type, loc)->get_backend(context); | |
11466 | Bexpression* cond = | |
11467 | gogo->backend()->binary_expression(OPERATOR_EQEQ, result_capacity, zero, | |
11468 | loc); | |
11469 | Bexpression* offset = gogo->backend()->conditional_expression(bfn, int_btype, | |
11470 | cond, zero, | |
11471 | start, loc); | |
44dbe1d7 | 11472 | Expression* valptr = array_type->get_value_pointer(gogo, this->array_, |
11473 | this->is_lvalue_); | |
03118c21 | 11474 | Bexpression* val = valptr->get_backend(context); |
11475 | val = gogo->backend()->pointer_offset_expression(val, offset, loc); | |
11476 | ||
2c809f8f | 11477 | Btype* struct_btype = this->type()->get_backend(gogo); |
11478 | std::vector<Bexpression*> init; | |
11479 | init.push_back(val); | |
11480 | init.push_back(result_length); | |
11481 | init.push_back(result_capacity); | |
e440a328 | 11482 | |
3d135120 | 11483 | Bexpression* ret = |
2c809f8f | 11484 | gogo->backend()->constructor_expression(struct_btype, init, loc); |
3d135120 | 11485 | if (this->needs_bounds_check_) |
11486 | ret = gogo->backend()->conditional_expression(bfn, struct_btype, bad_index, | |
11487 | crash, ret, loc); | |
11488 | return ret; | |
e440a328 | 11489 | } |
11490 | ||
d751bb78 | 11491 | // Dump ast representation for an array index expression. |
11492 | ||
11493 | void | |
f03a9fbf | 11494 | Array_index_expression::do_dump_expression(Ast_dump_context* ast_dump_context) |
d751bb78 | 11495 | const |
11496 | { | |
f03a9fbf | 11497 | Index_expression::dump_index_expression(ast_dump_context, this->array_, |
acf2b673 | 11498 | this->start_, this->end_, this->cap_); |
d751bb78 | 11499 | } |
11500 | ||
acf2b673 | 11501 | // Make an array index expression. END and CAP may be NULL. |
e440a328 | 11502 | |
11503 | Expression* | |
11504 | Expression::make_array_index(Expression* array, Expression* start, | |
acf2b673 | 11505 | Expression* end, Expression* cap, |
11506 | Location location) | |
e440a328 | 11507 | { |
acf2b673 | 11508 | return new Array_index_expression(array, start, end, cap, location); |
e440a328 | 11509 | } |
11510 | ||
50075d74 | 11511 | // Class String_index_expression. |
e440a328 | 11512 | |
11513 | // String index traversal. | |
11514 | ||
11515 | int | |
11516 | String_index_expression::do_traverse(Traverse* traverse) | |
11517 | { | |
11518 | if (Expression::traverse(&this->string_, traverse) == TRAVERSE_EXIT) | |
11519 | return TRAVERSE_EXIT; | |
11520 | if (Expression::traverse(&this->start_, traverse) == TRAVERSE_EXIT) | |
11521 | return TRAVERSE_EXIT; | |
11522 | if (this->end_ != NULL) | |
11523 | { | |
11524 | if (Expression::traverse(&this->end_, traverse) == TRAVERSE_EXIT) | |
11525 | return TRAVERSE_EXIT; | |
11526 | } | |
11527 | return TRAVERSE_CONTINUE; | |
11528 | } | |
11529 | ||
2c809f8f | 11530 | Expression* |
11531 | String_index_expression::do_flatten(Gogo*, Named_object*, | |
11532 | Statement_inserter* inserter) | |
e440a328 | 11533 | { |
2c809f8f | 11534 | Location loc = this->location(); |
5bf8be8b | 11535 | Expression* string = this->string_; |
11536 | Expression* start = this->start_; | |
11537 | Expression* end = this->end_; | |
11538 | if (string->is_error_expression() | |
11539 | || string->type()->is_error_type() | |
11540 | || start->is_error_expression() | |
11541 | || start->type()->is_error_type() | |
11542 | || (end != NULL | |
11543 | && (end->is_error_expression() || end->type()->is_error_type()))) | |
11544 | { | |
11545 | go_assert(saw_errors()); | |
11546 | return Expression::make_error(loc); | |
11547 | } | |
11548 | ||
11549 | Temporary_statement* temp; | |
2c809f8f | 11550 | if (!this->string_->is_variable()) |
11551 | { | |
11552 | temp = Statement::make_temporary(NULL, this->string_, loc); | |
11553 | inserter->insert(temp); | |
11554 | this->string_ = Expression::make_temporary_reference(temp, loc); | |
11555 | } | |
11556 | if (!this->start_->is_variable()) | |
11557 | { | |
11558 | temp = Statement::make_temporary(NULL, this->start_, loc); | |
11559 | inserter->insert(temp); | |
11560 | this->start_ = Expression::make_temporary_reference(temp, loc); | |
11561 | } | |
11562 | if (this->end_ != NULL | |
11563 | && !this->end_->is_nil_expression() | |
11564 | && !this->end_->is_variable()) | |
11565 | { | |
11566 | temp = Statement::make_temporary(NULL, this->end_, loc); | |
11567 | inserter->insert(temp); | |
11568 | this->end_ = Expression::make_temporary_reference(temp, loc); | |
11569 | } | |
11570 | ||
11571 | return this; | |
11572 | } | |
11573 | ||
11574 | // Return the type of a string index. | |
11575 | ||
11576 | Type* | |
11577 | String_index_expression::do_type() | |
11578 | { | |
11579 | if (this->end_ == NULL) | |
11580 | return Type::lookup_integer_type("uint8"); | |
11581 | else | |
11582 | return this->string_->type(); | |
11583 | } | |
11584 | ||
11585 | // Determine the type of a string index. | |
11586 | ||
11587 | void | |
11588 | String_index_expression::do_determine_type(const Type_context*) | |
11589 | { | |
11590 | this->string_->determine_type_no_context(); | |
f77aa642 | 11591 | |
11592 | Type_context index_context(Type::lookup_integer_type("int"), false); | |
11593 | if (this->start_->is_constant()) | |
11594 | this->start_->determine_type(&index_context); | |
11595 | else | |
11596 | this->start_->determine_type_no_context(); | |
e440a328 | 11597 | if (this->end_ != NULL) |
f77aa642 | 11598 | { |
11599 | if (this->end_->is_constant()) | |
11600 | this->end_->determine_type(&index_context); | |
11601 | else | |
11602 | this->end_->determine_type_no_context(); | |
11603 | } | |
e440a328 | 11604 | } |
11605 | ||
11606 | // Check types of a string index. | |
11607 | ||
11608 | void | |
11609 | String_index_expression::do_check_types(Gogo*) | |
11610 | { | |
acdc230d | 11611 | Numeric_constant nc; |
11612 | unsigned long v; | |
11613 | if (this->start_->type()->integer_type() == NULL | |
11614 | && !this->start_->type()->is_error() | |
11615 | && (!this->start_->numeric_constant_value(&nc) | |
11616 | || nc.to_unsigned_long(&v) == Numeric_constant::NC_UL_NOTINT)) | |
e440a328 | 11617 | this->report_error(_("index must be integer")); |
11618 | if (this->end_ != NULL | |
11619 | && this->end_->type()->integer_type() == NULL | |
acdc230d | 11620 | && !this->end_->type()->is_error() |
11621 | && !this->end_->is_nil_expression() | |
11622 | && !this->end_->is_error_expression() | |
11623 | && (!this->end_->numeric_constant_value(&nc) | |
11624 | || nc.to_unsigned_long(&v) == Numeric_constant::NC_UL_NOTINT)) | |
e440a328 | 11625 | this->report_error(_("slice end must be integer")); |
11626 | ||
11627 | std::string sval; | |
11628 | bool sval_valid = this->string_->string_constant_value(&sval); | |
11629 | ||
0c77715b | 11630 | Numeric_constant inc; |
e440a328 | 11631 | mpz_t ival; |
0bd5d859 | 11632 | bool ival_valid = false; |
0c77715b | 11633 | if (this->start_->numeric_constant_value(&inc) && inc.to_int(&ival)) |
e440a328 | 11634 | { |
0bd5d859 | 11635 | ival_valid = true; |
e440a328 | 11636 | if (mpz_sgn(ival) < 0 |
b10f32fb | 11637 | || (sval_valid |
11638 | && (this->end_ == NULL | |
11639 | ? mpz_cmp_ui(ival, sval.length()) >= 0 | |
11640 | : mpz_cmp_ui(ival, sval.length()) > 0))) | |
e440a328 | 11641 | { |
631d5788 | 11642 | go_error_at(this->start_->location(), "string index out of bounds"); |
e440a328 | 11643 | this->set_is_error(); |
11644 | } | |
11645 | } | |
11646 | if (this->end_ != NULL && !this->end_->is_nil_expression()) | |
11647 | { | |
0c77715b | 11648 | Numeric_constant enc; |
11649 | mpz_t eval; | |
11650 | if (this->end_->numeric_constant_value(&enc) && enc.to_int(&eval)) | |
e440a328 | 11651 | { |
0c77715b | 11652 | if (mpz_sgn(eval) < 0 |
11653 | || (sval_valid && mpz_cmp_ui(eval, sval.length()) > 0)) | |
e440a328 | 11654 | { |
631d5788 | 11655 | go_error_at(this->end_->location(), "string index out of bounds"); |
e440a328 | 11656 | this->set_is_error(); |
11657 | } | |
0bd5d859 | 11658 | else if (ival_valid && mpz_cmp(ival, eval) > 0) |
11659 | this->report_error(_("inverted slice range")); | |
0c77715b | 11660 | mpz_clear(eval); |
e440a328 | 11661 | } |
11662 | } | |
0bd5d859 | 11663 | if (ival_valid) |
11664 | mpz_clear(ival); | |
e440a328 | 11665 | } |
11666 | ||
ea664253 | 11667 | // Get the backend representation for a string index. |
e440a328 | 11668 | |
ea664253 | 11669 | Bexpression* |
11670 | String_index_expression::do_get_backend(Translate_context* context) | |
e440a328 | 11671 | { |
b13c66cd | 11672 | Location loc = this->location(); |
2c809f8f | 11673 | Expression* string_arg = this->string_; |
11674 | if (this->string_->type()->points_to() != NULL) | |
f614ea8b | 11675 | string_arg = Expression::make_dereference(this->string_, |
11676 | NIL_CHECK_NOT_NEEDED, loc); | |
e440a328 | 11677 | |
2c809f8f | 11678 | Expression* bad_index = Expression::check_bounds(this->start_, loc); |
e440a328 | 11679 | |
2c809f8f | 11680 | int code = (this->end_ == NULL |
11681 | ? RUNTIME_ERROR_STRING_INDEX_OUT_OF_BOUNDS | |
11682 | : RUNTIME_ERROR_STRING_SLICE_OUT_OF_BOUNDS); | |
e440a328 | 11683 | |
2c809f8f | 11684 | Gogo* gogo = context->gogo(); |
ea664253 | 11685 | Bexpression* crash = gogo->runtime_error(code, loc)->get_backend(context); |
1b1f2abf | 11686 | |
11687 | Type* int_type = Type::lookup_integer_type("int"); | |
e440a328 | 11688 | |
2c809f8f | 11689 | // It is possible that an error occurred earlier because the start index |
11690 | // cannot be represented as an integer type. In this case, we shouldn't | |
11691 | // try casting the starting index into an integer since | |
11692 | // Type_conversion_expression will fail to get the backend representation. | |
11693 | // FIXME. | |
11694 | if (this->start_->type()->integer_type() == NULL | |
11695 | && !Type::are_convertible(int_type, this->start_->type(), NULL)) | |
11696 | { | |
11697 | go_assert(saw_errors()); | |
ea664253 | 11698 | return context->backend()->error_expression(); |
2c809f8f | 11699 | } |
e440a328 | 11700 | |
2c809f8f | 11701 | Expression* start = Expression::make_cast(int_type, this->start_, loc); |
93715b75 | 11702 | Bfunction* bfn = context->function()->func_value()->get_decl(); |
e440a328 | 11703 | |
2c809f8f | 11704 | if (this->end_ == NULL) |
11705 | { | |
11706 | Expression* length = | |
11707 | Expression::make_string_info(this->string_, STRING_INFO_LENGTH, loc); | |
e440a328 | 11708 | |
2c809f8f | 11709 | Expression* start_too_large = |
11710 | Expression::make_binary(OPERATOR_GE, start, length, loc); | |
11711 | bad_index = Expression::make_binary(OPERATOR_OROR, start_too_large, | |
11712 | bad_index, loc); | |
11713 | Expression* bytes = | |
11714 | Expression::make_string_info(this->string_, STRING_INFO_DATA, loc); | |
e440a328 | 11715 | |
ea664253 | 11716 | Bexpression* bstart = start->get_backend(context); |
11717 | Bexpression* ptr = bytes->get_backend(context); | |
2c809f8f | 11718 | ptr = gogo->backend()->pointer_offset_expression(ptr, bstart, loc); |
9b27b43c | 11719 | Btype* ubtype = Type::lookup_integer_type("uint8")->get_backend(gogo); |
f03a9fbf | 11720 | Bexpression* index = |
9b27b43c | 11721 | gogo->backend()->indirect_expression(ubtype, ptr, true, loc); |
e440a328 | 11722 | |
2c809f8f | 11723 | Btype* byte_btype = bytes->type()->points_to()->get_backend(gogo); |
ea664253 | 11724 | Bexpression* index_error = bad_index->get_backend(context); |
93715b75 | 11725 | return gogo->backend()->conditional_expression(bfn, byte_btype, |
11726 | index_error, crash, | |
11727 | index, loc); | |
2c809f8f | 11728 | } |
11729 | ||
11730 | Expression* end = NULL; | |
11731 | if (this->end_->is_nil_expression()) | |
e67508fa | 11732 | end = Expression::make_integer_sl(-1, int_type, loc); |
e440a328 | 11733 | else |
11734 | { | |
2c809f8f | 11735 | Expression* bounds_check = Expression::check_bounds(this->end_, loc); |
11736 | bad_index = | |
11737 | Expression::make_binary(OPERATOR_OROR, bounds_check, bad_index, loc); | |
11738 | end = Expression::make_cast(int_type, this->end_, loc); | |
e440a328 | 11739 | } |
2c809f8f | 11740 | |
11741 | Expression* strslice = Runtime::make_call(Runtime::STRING_SLICE, loc, 3, | |
11742 | string_arg, start, end); | |
ea664253 | 11743 | Bexpression* bstrslice = strslice->get_backend(context); |
2c809f8f | 11744 | |
11745 | Btype* str_btype = strslice->type()->get_backend(gogo); | |
ea664253 | 11746 | Bexpression* index_error = bad_index->get_backend(context); |
93715b75 | 11747 | return gogo->backend()->conditional_expression(bfn, str_btype, index_error, |
ea664253 | 11748 | crash, bstrslice, loc); |
e440a328 | 11749 | } |
11750 | ||
d751bb78 | 11751 | // Dump ast representation for a string index expression. |
11752 | ||
11753 | void | |
11754 | String_index_expression::do_dump_expression(Ast_dump_context* ast_dump_context) | |
11755 | const | |
11756 | { | |
acf2b673 | 11757 | Index_expression::dump_index_expression(ast_dump_context, this->string_, |
11758 | this->start_, this->end_, NULL); | |
d751bb78 | 11759 | } |
11760 | ||
e440a328 | 11761 | // Make a string index expression. END may be NULL. |
11762 | ||
11763 | Expression* | |
11764 | Expression::make_string_index(Expression* string, Expression* start, | |
b13c66cd | 11765 | Expression* end, Location location) |
e440a328 | 11766 | { |
11767 | return new String_index_expression(string, start, end, location); | |
11768 | } | |
11769 | ||
11770 | // Class Map_index. | |
11771 | ||
11772 | // Get the type of the map. | |
11773 | ||
11774 | Map_type* | |
11775 | Map_index_expression::get_map_type() const | |
11776 | { | |
0d5530d9 | 11777 | Map_type* mt = this->map_->type()->map_type(); |
c7524fae | 11778 | if (mt == NULL) |
c484d925 | 11779 | go_assert(saw_errors()); |
e440a328 | 11780 | return mt; |
11781 | } | |
11782 | ||
11783 | // Map index traversal. | |
11784 | ||
11785 | int | |
11786 | Map_index_expression::do_traverse(Traverse* traverse) | |
11787 | { | |
11788 | if (Expression::traverse(&this->map_, traverse) == TRAVERSE_EXIT) | |
11789 | return TRAVERSE_EXIT; | |
11790 | return Expression::traverse(&this->index_, traverse); | |
11791 | } | |
11792 | ||
2c809f8f | 11793 | // We need to pass in a pointer to the key, so flatten the index into a |
11794 | // temporary variable if it isn't already. The value pointer will be | |
11795 | // dereferenced and checked for nil, so flatten into a temporary to avoid | |
11796 | // recomputation. | |
11797 | ||
11798 | Expression* | |
91c0fd76 | 11799 | Map_index_expression::do_flatten(Gogo* gogo, Named_object*, |
2c809f8f | 11800 | Statement_inserter* inserter) |
11801 | { | |
91c0fd76 | 11802 | Location loc = this->location(); |
2c809f8f | 11803 | Map_type* mt = this->get_map_type(); |
5bf8be8b | 11804 | if (this->index()->is_error_expression() |
11805 | || this->index()->type()->is_error_type() | |
11806 | || mt->is_error_type()) | |
11807 | { | |
11808 | go_assert(saw_errors()); | |
11809 | return Expression::make_error(loc); | |
11810 | } | |
11811 | ||
3a522dcc | 11812 | if (!Type::are_identical(mt->key_type(), this->index_->type(), |
11813 | Type::COMPARE_ERRORS | Type::COMPARE_TAGS, | |
11814 | NULL)) | |
91c0fd76 | 11815 | { |
11816 | if (this->index_->type()->interface_type() != NULL | |
11817 | && !this->index_->is_variable()) | |
11818 | { | |
11819 | Temporary_statement* temp = | |
11820 | Statement::make_temporary(NULL, this->index_, loc); | |
11821 | inserter->insert(temp); | |
11822 | this->index_ = Expression::make_temporary_reference(temp, loc); | |
11823 | } | |
11824 | this->index_ = Expression::convert_for_assignment(gogo, mt->key_type(), | |
11825 | this->index_, loc); | |
11826 | } | |
2c809f8f | 11827 | |
11828 | if (!this->index_->is_variable()) | |
11829 | { | |
11830 | Temporary_statement* temp = Statement::make_temporary(NULL, this->index_, | |
91c0fd76 | 11831 | loc); |
2c809f8f | 11832 | inserter->insert(temp); |
91c0fd76 | 11833 | this->index_ = Expression::make_temporary_reference(temp, loc); |
2c809f8f | 11834 | } |
11835 | ||
11836 | if (this->value_pointer_ == NULL) | |
0d5530d9 | 11837 | this->get_value_pointer(gogo); |
5bf8be8b | 11838 | if (this->value_pointer_->is_error_expression() |
11839 | || this->value_pointer_->type()->is_error_type()) | |
11840 | return Expression::make_error(loc); | |
2c809f8f | 11841 | if (!this->value_pointer_->is_variable()) |
11842 | { | |
11843 | Temporary_statement* temp = | |
91c0fd76 | 11844 | Statement::make_temporary(NULL, this->value_pointer_, loc); |
2c809f8f | 11845 | inserter->insert(temp); |
91c0fd76 | 11846 | this->value_pointer_ = Expression::make_temporary_reference(temp, loc); |
2c809f8f | 11847 | } |
11848 | ||
11849 | return this; | |
11850 | } | |
11851 | ||
e440a328 | 11852 | // Return the type of a map index. |
11853 | ||
11854 | Type* | |
11855 | Map_index_expression::do_type() | |
11856 | { | |
c7524fae | 11857 | Map_type* mt = this->get_map_type(); |
11858 | if (mt == NULL) | |
11859 | return Type::make_error_type(); | |
0d5530d9 | 11860 | return mt->val_type(); |
e440a328 | 11861 | } |
11862 | ||
11863 | // Fix the type of a map index. | |
11864 | ||
11865 | void | |
11866 | Map_index_expression::do_determine_type(const Type_context*) | |
11867 | { | |
11868 | this->map_->determine_type_no_context(); | |
c7524fae | 11869 | Map_type* mt = this->get_map_type(); |
11870 | Type* key_type = mt == NULL ? NULL : mt->key_type(); | |
11871 | Type_context subcontext(key_type, false); | |
e440a328 | 11872 | this->index_->determine_type(&subcontext); |
11873 | } | |
11874 | ||
11875 | // Check types of a map index. | |
11876 | ||
11877 | void | |
11878 | Map_index_expression::do_check_types(Gogo*) | |
11879 | { | |
11880 | std::string reason; | |
c7524fae | 11881 | Map_type* mt = this->get_map_type(); |
11882 | if (mt == NULL) | |
11883 | return; | |
11884 | if (!Type::are_assignable(mt->key_type(), this->index_->type(), &reason)) | |
e440a328 | 11885 | { |
11886 | if (reason.empty()) | |
11887 | this->report_error(_("incompatible type for map index")); | |
11888 | else | |
11889 | { | |
631d5788 | 11890 | go_error_at(this->location(), "incompatible type for map index (%s)", |
11891 | reason.c_str()); | |
e440a328 | 11892 | this->set_is_error(); |
11893 | } | |
11894 | } | |
11895 | } | |
11896 | ||
ea664253 | 11897 | // Get the backend representation for a map index. |
e440a328 | 11898 | |
ea664253 | 11899 | Bexpression* |
11900 | Map_index_expression::do_get_backend(Translate_context* context) | |
e440a328 | 11901 | { |
11902 | Map_type* type = this->get_map_type(); | |
c7524fae | 11903 | if (type == NULL) |
2c809f8f | 11904 | { |
11905 | go_assert(saw_errors()); | |
ea664253 | 11906 | return context->backend()->error_expression(); |
2c809f8f | 11907 | } |
e440a328 | 11908 | |
2c809f8f | 11909 | go_assert(this->value_pointer_ != NULL |
11910 | && this->value_pointer_->is_variable()); | |
e440a328 | 11911 | |
f614ea8b | 11912 | Expression* val = Expression::make_dereference(this->value_pointer_, |
11913 | NIL_CHECK_NOT_NEEDED, | |
11914 | this->location()); | |
0d5530d9 | 11915 | return val->get_backend(context); |
e440a328 | 11916 | } |
11917 | ||
0d5530d9 | 11918 | // Get an expression for the map index. This returns an expression |
11919 | // that evaluates to a pointer to a value. If the key is not in the | |
11920 | // map, the pointer will point to a zero value. | |
e440a328 | 11921 | |
2c809f8f | 11922 | Expression* |
0d5530d9 | 11923 | Map_index_expression::get_value_pointer(Gogo* gogo) |
e440a328 | 11924 | { |
2c809f8f | 11925 | if (this->value_pointer_ == NULL) |
746d2e73 | 11926 | { |
2c809f8f | 11927 | Map_type* type = this->get_map_type(); |
11928 | if (type == NULL) | |
746d2e73 | 11929 | { |
2c809f8f | 11930 | go_assert(saw_errors()); |
11931 | return Expression::make_error(this->location()); | |
746d2e73 | 11932 | } |
e440a328 | 11933 | |
2c809f8f | 11934 | Location loc = this->location(); |
11935 | Expression* map_ref = this->map_; | |
e440a328 | 11936 | |
0d5530d9 | 11937 | Expression* index_ptr = Expression::make_unary(OPERATOR_AND, |
11938 | this->index_, | |
2c809f8f | 11939 | loc); |
0d5530d9 | 11940 | |
11941 | Expression* zero = type->fat_zero_value(gogo); | |
11942 | ||
11943 | Expression* map_index; | |
11944 | ||
11945 | if (zero == NULL) | |
11946 | map_index = | |
11947 | Runtime::make_call(Runtime::MAPACCESS1, loc, 3, | |
11948 | Expression::make_type_descriptor(type, loc), | |
11949 | map_ref, index_ptr); | |
11950 | else | |
11951 | map_index = | |
11952 | Runtime::make_call(Runtime::MAPACCESS1_FAT, loc, 4, | |
11953 | Expression::make_type_descriptor(type, loc), | |
11954 | map_ref, index_ptr, zero); | |
2c809f8f | 11955 | |
11956 | Type* val_type = type->val_type(); | |
11957 | this->value_pointer_ = | |
11958 | Expression::make_unsafe_cast(Type::make_pointer_type(val_type), | |
11959 | map_index, this->location()); | |
11960 | } | |
0d5530d9 | 11961 | |
2c809f8f | 11962 | return this->value_pointer_; |
e440a328 | 11963 | } |
11964 | ||
d751bb78 | 11965 | // Dump ast representation for a map index expression |
11966 | ||
11967 | void | |
f03a9fbf | 11968 | Map_index_expression::do_dump_expression(Ast_dump_context* ast_dump_context) |
d751bb78 | 11969 | const |
11970 | { | |
acf2b673 | 11971 | Index_expression::dump_index_expression(ast_dump_context, this->map_, |
11972 | this->index_, NULL, NULL); | |
d751bb78 | 11973 | } |
11974 | ||
e440a328 | 11975 | // Make a map index expression. |
11976 | ||
11977 | Map_index_expression* | |
11978 | Expression::make_map_index(Expression* map, Expression* index, | |
b13c66cd | 11979 | Location location) |
e440a328 | 11980 | { |
11981 | return new Map_index_expression(map, index, location); | |
11982 | } | |
11983 | ||
11984 | // Class Field_reference_expression. | |
11985 | ||
149eabc5 | 11986 | // Lower a field reference expression. There is nothing to lower, but |
11987 | // this is where we generate the tracking information for fields with | |
11988 | // the magic go:"track" tag. | |
11989 | ||
11990 | Expression* | |
11991 | Field_reference_expression::do_lower(Gogo* gogo, Named_object* function, | |
11992 | Statement_inserter* inserter, int) | |
11993 | { | |
11994 | Struct_type* struct_type = this->expr_->type()->struct_type(); | |
11995 | if (struct_type == NULL) | |
11996 | { | |
11997 | // Error will be reported elsewhere. | |
11998 | return this; | |
11999 | } | |
12000 | const Struct_field* field = struct_type->field(this->field_index_); | |
12001 | if (field == NULL) | |
12002 | return this; | |
12003 | if (!field->has_tag()) | |
12004 | return this; | |
12005 | if (field->tag().find("go:\"track\"") == std::string::npos) | |
12006 | return this; | |
12007 | ||
604e278d | 12008 | // References from functions generated by the compiler don't count. |
c6292d1d | 12009 | if (function != NULL && function->func_value()->is_type_specific_function()) |
604e278d | 12010 | return this; |
12011 | ||
149eabc5 | 12012 | // We have found a reference to a tracked field. Build a call to |
12013 | // the runtime function __go_fieldtrack with a string that describes | |
12014 | // the field. FIXME: We should only call this once per referenced | |
12015 | // field per function, not once for each reference to the field. | |
12016 | ||
12017 | if (this->called_fieldtrack_) | |
12018 | return this; | |
12019 | this->called_fieldtrack_ = true; | |
12020 | ||
12021 | Location loc = this->location(); | |
12022 | ||
12023 | std::string s = "fieldtrack \""; | |
e65055a5 | 12024 | Named_type* nt = this->expr_->type()->unalias()->named_type(); |
149eabc5 | 12025 | if (nt == NULL || nt->named_object()->package() == NULL) |
12026 | s.append(gogo->pkgpath()); | |
12027 | else | |
12028 | s.append(nt->named_object()->package()->pkgpath()); | |
12029 | s.push_back('.'); | |
12030 | if (nt != NULL) | |
5c29ad36 | 12031 | s.append(Gogo::unpack_hidden_name(nt->name())); |
149eabc5 | 12032 | s.push_back('.'); |
12033 | s.append(field->field_name()); | |
12034 | s.push_back('"'); | |
12035 | ||
12036 | // We can't use a string here, because internally a string holds a | |
12037 | // pointer to the actual bytes; when the linker garbage collects the | |
12038 | // string, it won't garbage collect the bytes. So we use a | |
12039 | // [...]byte. | |
12040 | ||
e67508fa | 12041 | Expression* length_expr = Expression::make_integer_ul(s.length(), NULL, loc); |
149eabc5 | 12042 | |
12043 | Type* byte_type = gogo->lookup_global("byte")->type_value(); | |
6bf4793c | 12044 | Array_type* array_type = Type::make_array_type(byte_type, length_expr); |
12045 | array_type->set_is_array_incomparable(); | |
149eabc5 | 12046 | |
12047 | Expression_list* bytes = new Expression_list(); | |
12048 | for (std::string::const_iterator p = s.begin(); p != s.end(); p++) | |
12049 | { | |
e67508fa | 12050 | unsigned char c = static_cast<unsigned char>(*p); |
12051 | bytes->push_back(Expression::make_integer_ul(c, NULL, loc)); | |
149eabc5 | 12052 | } |
12053 | ||
12054 | Expression* e = Expression::make_composite_literal(array_type, 0, false, | |
62750cd5 | 12055 | bytes, false, loc); |
149eabc5 | 12056 | |
12057 | Variable* var = new Variable(array_type, e, true, false, false, loc); | |
12058 | ||
12059 | static int count; | |
12060 | char buf[50]; | |
12061 | snprintf(buf, sizeof buf, "fieldtrack.%d", count); | |
12062 | ++count; | |
12063 | ||
12064 | Named_object* no = gogo->add_variable(buf, var); | |
12065 | e = Expression::make_var_reference(no, loc); | |
12066 | e = Expression::make_unary(OPERATOR_AND, e, loc); | |
12067 | ||
12068 | Expression* call = Runtime::make_call(Runtime::FIELDTRACK, loc, 1, e); | |
604e278d | 12069 | gogo->lower_expression(function, inserter, &call); |
149eabc5 | 12070 | inserter->insert(Statement::make_statement(call, false)); |
12071 | ||
12072 | // Put this function, and the global variable we just created, into | |
12073 | // unique sections. This will permit the linker to garbage collect | |
12074 | // them if they are not referenced. The effect is that the only | |
12075 | // strings, indicating field references, that will wind up in the | |
12076 | // executable will be those for functions that are actually needed. | |
66a6be58 | 12077 | if (function != NULL) |
12078 | function->func_value()->set_in_unique_section(); | |
149eabc5 | 12079 | var->set_in_unique_section(); |
12080 | ||
12081 | return this; | |
12082 | } | |
12083 | ||
e440a328 | 12084 | // Return the type of a field reference. |
12085 | ||
12086 | Type* | |
12087 | Field_reference_expression::do_type() | |
12088 | { | |
b0e628fb | 12089 | Type* type = this->expr_->type(); |
5c13bd80 | 12090 | if (type->is_error()) |
b0e628fb | 12091 | return type; |
12092 | Struct_type* struct_type = type->struct_type(); | |
c484d925 | 12093 | go_assert(struct_type != NULL); |
e440a328 | 12094 | return struct_type->field(this->field_index_)->type(); |
12095 | } | |
12096 | ||
12097 | // Check the types for a field reference. | |
12098 | ||
12099 | void | |
12100 | Field_reference_expression::do_check_types(Gogo*) | |
12101 | { | |
b0e628fb | 12102 | Type* type = this->expr_->type(); |
5c13bd80 | 12103 | if (type->is_error()) |
b0e628fb | 12104 | return; |
12105 | Struct_type* struct_type = type->struct_type(); | |
c484d925 | 12106 | go_assert(struct_type != NULL); |
12107 | go_assert(struct_type->field(this->field_index_) != NULL); | |
e440a328 | 12108 | } |
12109 | ||
ea664253 | 12110 | // Get the backend representation for a field reference. |
e440a328 | 12111 | |
ea664253 | 12112 | Bexpression* |
12113 | Field_reference_expression::do_get_backend(Translate_context* context) | |
e440a328 | 12114 | { |
ea664253 | 12115 | Bexpression* bstruct = this->expr_->get_backend(context); |
12116 | return context->gogo()->backend()->struct_field_expression(bstruct, | |
12117 | this->field_index_, | |
12118 | this->location()); | |
e440a328 | 12119 | } |
12120 | ||
d751bb78 | 12121 | // Dump ast representation for a field reference expression. |
12122 | ||
12123 | void | |
12124 | Field_reference_expression::do_dump_expression( | |
12125 | Ast_dump_context* ast_dump_context) const | |
12126 | { | |
12127 | this->expr_->dump_expression(ast_dump_context); | |
12128 | ast_dump_context->ostream() << "." << this->field_index_; | |
12129 | } | |
12130 | ||
e440a328 | 12131 | // Make a reference to a qualified identifier in an expression. |
12132 | ||
12133 | Field_reference_expression* | |
12134 | Expression::make_field_reference(Expression* expr, unsigned int field_index, | |
b13c66cd | 12135 | Location location) |
e440a328 | 12136 | { |
12137 | return new Field_reference_expression(expr, field_index, location); | |
12138 | } | |
12139 | ||
12140 | // Class Interface_field_reference_expression. | |
12141 | ||
2387f644 | 12142 | // Return an expression for the pointer to the function to call. |
e440a328 | 12143 | |
2387f644 | 12144 | Expression* |
12145 | Interface_field_reference_expression::get_function() | |
e440a328 | 12146 | { |
2387f644 | 12147 | Expression* ref = this->expr_; |
12148 | Location loc = this->location(); | |
12149 | if (ref->type()->points_to() != NULL) | |
f614ea8b | 12150 | ref = Expression::make_dereference(ref, NIL_CHECK_DEFAULT, loc); |
e440a328 | 12151 | |
2387f644 | 12152 | Expression* mtable = |
12153 | Expression::make_interface_info(ref, INTERFACE_INFO_METHODS, loc); | |
12154 | Struct_type* mtable_type = mtable->type()->points_to()->struct_type(); | |
e440a328 | 12155 | |
12156 | std::string name = Gogo::unpack_hidden_name(this->name_); | |
2387f644 | 12157 | unsigned int index; |
12158 | const Struct_field* field = mtable_type->find_local_field(name, &index); | |
12159 | go_assert(field != NULL); | |
f614ea8b | 12160 | |
12161 | mtable = Expression::make_dereference(mtable, NIL_CHECK_NOT_NEEDED, loc); | |
2387f644 | 12162 | return Expression::make_field_reference(mtable, index, loc); |
e440a328 | 12163 | } |
12164 | ||
2387f644 | 12165 | // Return an expression for the first argument to pass to the interface |
e440a328 | 12166 | // function. |
12167 | ||
2387f644 | 12168 | Expression* |
12169 | Interface_field_reference_expression::get_underlying_object() | |
e440a328 | 12170 | { |
2387f644 | 12171 | Expression* expr = this->expr_; |
12172 | if (expr->type()->points_to() != NULL) | |
f614ea8b | 12173 | expr = Expression::make_dereference(expr, NIL_CHECK_DEFAULT, |
12174 | this->location()); | |
2387f644 | 12175 | return Expression::make_interface_info(expr, INTERFACE_INFO_OBJECT, |
12176 | this->location()); | |
e440a328 | 12177 | } |
12178 | ||
12179 | // Traversal. | |
12180 | ||
12181 | int | |
12182 | Interface_field_reference_expression::do_traverse(Traverse* traverse) | |
12183 | { | |
12184 | return Expression::traverse(&this->expr_, traverse); | |
12185 | } | |
12186 | ||
0afbb937 | 12187 | // Lower the expression. If this expression is not called, we need to |
12188 | // evaluate the expression twice when converting to the backend | |
12189 | // interface. So introduce a temporary variable if necessary. | |
12190 | ||
12191 | Expression* | |
9782d556 | 12192 | Interface_field_reference_expression::do_flatten(Gogo*, Named_object*, |
12193 | Statement_inserter* inserter) | |
0afbb937 | 12194 | { |
5bf8be8b | 12195 | if (this->expr_->is_error_expression() |
12196 | || this->expr_->type()->is_error_type()) | |
12197 | { | |
12198 | go_assert(saw_errors()); | |
12199 | return Expression::make_error(this->location()); | |
12200 | } | |
12201 | ||
2387f644 | 12202 | if (!this->expr_->is_variable()) |
0afbb937 | 12203 | { |
12204 | Temporary_statement* temp = | |
9189e53b | 12205 | Statement::make_temporary(NULL, this->expr_, this->location()); |
0afbb937 | 12206 | inserter->insert(temp); |
9189e53b | 12207 | this->expr_ = Expression::make_temporary_reference(temp, this->location()); |
0afbb937 | 12208 | } |
12209 | return this; | |
12210 | } | |
12211 | ||
e440a328 | 12212 | // Return the type of an interface field reference. |
12213 | ||
12214 | Type* | |
12215 | Interface_field_reference_expression::do_type() | |
12216 | { | |
12217 | Type* expr_type = this->expr_->type(); | |
12218 | ||
12219 | Type* points_to = expr_type->points_to(); | |
12220 | if (points_to != NULL) | |
12221 | expr_type = points_to; | |
12222 | ||
12223 | Interface_type* interface_type = expr_type->interface_type(); | |
12224 | if (interface_type == NULL) | |
12225 | return Type::make_error_type(); | |
12226 | ||
12227 | const Typed_identifier* method = interface_type->find_method(this->name_); | |
12228 | if (method == NULL) | |
12229 | return Type::make_error_type(); | |
12230 | ||
12231 | return method->type(); | |
12232 | } | |
12233 | ||
12234 | // Determine types. | |
12235 | ||
12236 | void | |
12237 | Interface_field_reference_expression::do_determine_type(const Type_context*) | |
12238 | { | |
12239 | this->expr_->determine_type_no_context(); | |
12240 | } | |
12241 | ||
12242 | // Check the types for an interface field reference. | |
12243 | ||
12244 | void | |
12245 | Interface_field_reference_expression::do_check_types(Gogo*) | |
12246 | { | |
12247 | Type* type = this->expr_->type(); | |
12248 | ||
12249 | Type* points_to = type->points_to(); | |
12250 | if (points_to != NULL) | |
12251 | type = points_to; | |
12252 | ||
12253 | Interface_type* interface_type = type->interface_type(); | |
12254 | if (interface_type == NULL) | |
5c491127 | 12255 | { |
12256 | if (!type->is_error_type()) | |
12257 | this->report_error(_("expected interface or pointer to interface")); | |
12258 | } | |
e440a328 | 12259 | else |
12260 | { | |
12261 | const Typed_identifier* method = | |
12262 | interface_type->find_method(this->name_); | |
12263 | if (method == NULL) | |
12264 | { | |
631d5788 | 12265 | go_error_at(this->location(), "method %qs not in interface", |
12266 | Gogo::message_name(this->name_).c_str()); | |
e440a328 | 12267 | this->set_is_error(); |
12268 | } | |
12269 | } | |
12270 | } | |
12271 | ||
0afbb937 | 12272 | // If an interface field reference is not simply called, then it is |
12273 | // represented as a closure. The closure will hold a single variable, | |
12274 | // the value of the interface on which the method should be called. | |
12275 | // The function will be a simple thunk that pulls the value from the | |
12276 | // closure and calls the method with the remaining arguments. | |
12277 | ||
12278 | // Because method values are not common, we don't build all thunks for | |
12279 | // all possible interface methods, but instead only build them as we | |
12280 | // need them. In particular, we even build them on demand for | |
12281 | // interface methods defined in other packages. | |
12282 | ||
12283 | Interface_field_reference_expression::Interface_method_thunks | |
12284 | Interface_field_reference_expression::interface_method_thunks; | |
12285 | ||
12286 | // Find or create the thunk to call method NAME on TYPE. | |
12287 | ||
12288 | Named_object* | |
12289 | Interface_field_reference_expression::create_thunk(Gogo* gogo, | |
12290 | Interface_type* type, | |
12291 | const std::string& name) | |
12292 | { | |
12293 | std::pair<Interface_type*, Method_thunks*> val(type, NULL); | |
12294 | std::pair<Interface_method_thunks::iterator, bool> ins = | |
12295 | Interface_field_reference_expression::interface_method_thunks.insert(val); | |
12296 | if (ins.second) | |
12297 | { | |
12298 | // This is the first time we have seen this interface. | |
12299 | ins.first->second = new Method_thunks(); | |
12300 | } | |
12301 | ||
12302 | for (Method_thunks::const_iterator p = ins.first->second->begin(); | |
12303 | p != ins.first->second->end(); | |
12304 | p++) | |
12305 | if (p->first == name) | |
12306 | return p->second; | |
12307 | ||
12308 | Location loc = type->location(); | |
12309 | ||
12310 | const Typed_identifier* method_id = type->find_method(name); | |
12311 | if (method_id == NULL) | |
13f2fdb8 | 12312 | return Named_object::make_erroneous_name(gogo->thunk_name()); |
0afbb937 | 12313 | |
12314 | Function_type* orig_fntype = method_id->type()->function_type(); | |
12315 | if (orig_fntype == NULL) | |
13f2fdb8 | 12316 | return Named_object::make_erroneous_name(gogo->thunk_name()); |
0afbb937 | 12317 | |
12318 | Struct_field_list* sfl = new Struct_field_list(); | |
f8bdf81a | 12319 | // The type here is wrong--it should be the C function type. But it |
12320 | // doesn't really matter. | |
0afbb937 | 12321 | Type* vt = Type::make_pointer_type(Type::make_void_type()); |
13f2fdb8 | 12322 | sfl->push_back(Struct_field(Typed_identifier("fn", vt, loc))); |
12323 | sfl->push_back(Struct_field(Typed_identifier("val", type, loc))); | |
6bf4793c | 12324 | Struct_type* st = Type::make_struct_type(sfl, loc); |
12325 | st->set_is_struct_incomparable(); | |
12326 | Type* closure_type = Type::make_pointer_type(st); | |
0afbb937 | 12327 | |
f8bdf81a | 12328 | Function_type* new_fntype = orig_fntype->copy_with_names(); |
0afbb937 | 12329 | |
13f2fdb8 | 12330 | std::string thunk_name = gogo->thunk_name(); |
da244e59 | 12331 | Named_object* new_no = gogo->start_function(thunk_name, new_fntype, |
0afbb937 | 12332 | false, loc); |
12333 | ||
f8bdf81a | 12334 | Variable* cvar = new Variable(closure_type, NULL, false, false, false, loc); |
12335 | cvar->set_is_used(); | |
1ecc6157 | 12336 | cvar->set_is_closure(); |
da244e59 | 12337 | Named_object* cp = Named_object::make_variable("$closure" + thunk_name, |
12338 | NULL, cvar); | |
f8bdf81a | 12339 | new_no->func_value()->set_closure_var(cp); |
0afbb937 | 12340 | |
f8bdf81a | 12341 | gogo->start_block(loc); |
0afbb937 | 12342 | |
12343 | // Field 0 of the closure is the function code pointer, field 1 is | |
12344 | // the value on which to invoke the method. | |
12345 | Expression* arg = Expression::make_var_reference(cp, loc); | |
f614ea8b | 12346 | arg = Expression::make_dereference(arg, NIL_CHECK_NOT_NEEDED, loc); |
0afbb937 | 12347 | arg = Expression::make_field_reference(arg, 1, loc); |
12348 | ||
12349 | Expression *ifre = Expression::make_interface_field_reference(arg, name, | |
12350 | loc); | |
12351 | ||
12352 | const Typed_identifier_list* orig_params = orig_fntype->parameters(); | |
12353 | Expression_list* args; | |
12354 | if (orig_params == NULL || orig_params->empty()) | |
12355 | args = NULL; | |
12356 | else | |
12357 | { | |
12358 | const Typed_identifier_list* new_params = new_fntype->parameters(); | |
12359 | args = new Expression_list(); | |
12360 | for (Typed_identifier_list::const_iterator p = new_params->begin(); | |
f8bdf81a | 12361 | p != new_params->end(); |
0afbb937 | 12362 | ++p) |
12363 | { | |
12364 | Named_object* p_no = gogo->lookup(p->name(), NULL); | |
12365 | go_assert(p_no != NULL | |
12366 | && p_no->is_variable() | |
12367 | && p_no->var_value()->is_parameter()); | |
12368 | args->push_back(Expression::make_var_reference(p_no, loc)); | |
12369 | } | |
12370 | } | |
12371 | ||
12372 | Call_expression* call = Expression::make_call(ifre, args, | |
12373 | orig_fntype->is_varargs(), | |
12374 | loc); | |
12375 | call->set_varargs_are_lowered(); | |
12376 | ||
12377 | Statement* s = Statement::make_return_from_call(call, loc); | |
12378 | gogo->add_statement(s); | |
12379 | Block* b = gogo->finish_block(loc); | |
12380 | gogo->add_block(b, loc); | |
12381 | gogo->lower_block(new_no, b); | |
a32698ee | 12382 | gogo->flatten_block(new_no, b); |
0afbb937 | 12383 | gogo->finish_function(loc); |
12384 | ||
12385 | ins.first->second->push_back(std::make_pair(name, new_no)); | |
12386 | return new_no; | |
12387 | } | |
12388 | ||
ea664253 | 12389 | // Get the backend representation for a method value. |
e440a328 | 12390 | |
ea664253 | 12391 | Bexpression* |
12392 | Interface_field_reference_expression::do_get_backend(Translate_context* context) | |
e440a328 | 12393 | { |
0afbb937 | 12394 | Interface_type* type = this->expr_->type()->interface_type(); |
12395 | if (type == NULL) | |
12396 | { | |
12397 | go_assert(saw_errors()); | |
ea664253 | 12398 | return context->backend()->error_expression(); |
0afbb937 | 12399 | } |
12400 | ||
12401 | Named_object* thunk = | |
12402 | Interface_field_reference_expression::create_thunk(context->gogo(), | |
12403 | type, this->name_); | |
12404 | if (thunk->is_erroneous()) | |
12405 | { | |
12406 | go_assert(saw_errors()); | |
ea664253 | 12407 | return context->backend()->error_expression(); |
0afbb937 | 12408 | } |
12409 | ||
12410 | // FIXME: We should lower this earlier, but we can't it lower it in | |
12411 | // the lowering pass because at that point we don't know whether we | |
12412 | // need to create the thunk or not. If the expression is called, we | |
12413 | // don't need the thunk. | |
12414 | ||
12415 | Location loc = this->location(); | |
12416 | ||
12417 | Struct_field_list* fields = new Struct_field_list(); | |
13f2fdb8 | 12418 | fields->push_back(Struct_field(Typed_identifier("fn", |
0afbb937 | 12419 | thunk->func_value()->type(), |
12420 | loc))); | |
13f2fdb8 | 12421 | fields->push_back(Struct_field(Typed_identifier("val", |
0afbb937 | 12422 | this->expr_->type(), |
12423 | loc))); | |
12424 | Struct_type* st = Type::make_struct_type(fields, loc); | |
6bf4793c | 12425 | st->set_is_struct_incomparable(); |
0afbb937 | 12426 | |
12427 | Expression_list* vals = new Expression_list(); | |
12428 | vals->push_back(Expression::make_func_code_reference(thunk, loc)); | |
12429 | vals->push_back(this->expr_); | |
12430 | ||
12431 | Expression* expr = Expression::make_struct_composite_literal(st, vals, loc); | |
ea664253 | 12432 | Bexpression* bclosure = |
12433 | Expression::make_heap_expression(expr, loc)->get_backend(context); | |
0afbb937 | 12434 | |
4df0c2d4 | 12435 | Gogo* gogo = context->gogo(); |
12436 | Btype* btype = this->type()->get_backend(gogo); | |
12437 | bclosure = gogo->backend()->convert_expression(btype, bclosure, loc); | |
12438 | ||
2387f644 | 12439 | Expression* nil_check = |
12440 | Expression::make_binary(OPERATOR_EQEQ, this->expr_, | |
12441 | Expression::make_nil(loc), loc); | |
ea664253 | 12442 | Bexpression* bnil_check = nil_check->get_backend(context); |
0afbb937 | 12443 | |
ea664253 | 12444 | Bexpression* bcrash = gogo->runtime_error(RUNTIME_ERROR_NIL_DEREFERENCE, |
12445 | loc)->get_backend(context); | |
2387f644 | 12446 | |
93715b75 | 12447 | Bfunction* bfn = context->function()->func_value()->get_decl(); |
2387f644 | 12448 | Bexpression* bcond = |
93715b75 | 12449 | gogo->backend()->conditional_expression(bfn, NULL, |
12450 | bnil_check, bcrash, NULL, loc); | |
0ab48656 | 12451 | Bfunction* bfunction = context->function()->func_value()->get_decl(); |
12452 | Bstatement* cond_statement = | |
12453 | gogo->backend()->expression_statement(bfunction, bcond); | |
ea664253 | 12454 | return gogo->backend()->compound_expression(cond_statement, bclosure, loc); |
e440a328 | 12455 | } |
12456 | ||
d751bb78 | 12457 | // Dump ast representation for an interface field reference. |
12458 | ||
12459 | void | |
12460 | Interface_field_reference_expression::do_dump_expression( | |
12461 | Ast_dump_context* ast_dump_context) const | |
12462 | { | |
12463 | this->expr_->dump_expression(ast_dump_context); | |
12464 | ast_dump_context->ostream() << "." << this->name_; | |
12465 | } | |
12466 | ||
e440a328 | 12467 | // Make a reference to a field in an interface. |
12468 | ||
12469 | Expression* | |
12470 | Expression::make_interface_field_reference(Expression* expr, | |
12471 | const std::string& field, | |
b13c66cd | 12472 | Location location) |
e440a328 | 12473 | { |
12474 | return new Interface_field_reference_expression(expr, field, location); | |
12475 | } | |
12476 | ||
12477 | // A general selector. This is a Parser_expression for LEFT.NAME. It | |
12478 | // is lowered after we know the type of the left hand side. | |
12479 | ||
12480 | class Selector_expression : public Parser_expression | |
12481 | { | |
12482 | public: | |
12483 | Selector_expression(Expression* left, const std::string& name, | |
b13c66cd | 12484 | Location location) |
e440a328 | 12485 | : Parser_expression(EXPRESSION_SELECTOR, location), |
12486 | left_(left), name_(name) | |
12487 | { } | |
12488 | ||
12489 | protected: | |
12490 | int | |
12491 | do_traverse(Traverse* traverse) | |
12492 | { return Expression::traverse(&this->left_, traverse); } | |
12493 | ||
12494 | Expression* | |
ceeb4318 | 12495 | do_lower(Gogo*, Named_object*, Statement_inserter*, int); |
e440a328 | 12496 | |
12497 | Expression* | |
12498 | do_copy() | |
12499 | { | |
12500 | return new Selector_expression(this->left_->copy(), this->name_, | |
12501 | this->location()); | |
12502 | } | |
12503 | ||
d751bb78 | 12504 | void |
12505 | do_dump_expression(Ast_dump_context* ast_dump_context) const; | |
12506 | ||
e440a328 | 12507 | private: |
12508 | Expression* | |
12509 | lower_method_expression(Gogo*); | |
12510 | ||
12511 | // The expression on the left hand side. | |
12512 | Expression* left_; | |
12513 | // The name on the right hand side. | |
12514 | std::string name_; | |
12515 | }; | |
12516 | ||
12517 | // Lower a selector expression once we know the real type of the left | |
12518 | // hand side. | |
12519 | ||
12520 | Expression* | |
ceeb4318 | 12521 | Selector_expression::do_lower(Gogo* gogo, Named_object*, Statement_inserter*, |
12522 | int) | |
e440a328 | 12523 | { |
12524 | Expression* left = this->left_; | |
12525 | if (left->is_type_expression()) | |
12526 | return this->lower_method_expression(gogo); | |
12527 | return Type::bind_field_or_method(gogo, left->type(), left, this->name_, | |
12528 | this->location()); | |
12529 | } | |
12530 | ||
12531 | // Lower a method expression T.M or (*T).M. We turn this into a | |
12532 | // function literal. | |
12533 | ||
12534 | Expression* | |
12535 | Selector_expression::lower_method_expression(Gogo* gogo) | |
12536 | { | |
b13c66cd | 12537 | Location location = this->location(); |
868b439e | 12538 | Type* left_type = this->left_->type(); |
12539 | Type* type = left_type; | |
e440a328 | 12540 | const std::string& name(this->name_); |
12541 | ||
12542 | bool is_pointer; | |
12543 | if (type->points_to() == NULL) | |
12544 | is_pointer = false; | |
12545 | else | |
12546 | { | |
12547 | is_pointer = true; | |
12548 | type = type->points_to(); | |
12549 | } | |
12550 | Named_type* nt = type->named_type(); | |
12551 | if (nt == NULL) | |
12552 | { | |
631d5788 | 12553 | go_error_at(location, |
12554 | ("method expression requires named type or " | |
12555 | "pointer to named type")); | |
e440a328 | 12556 | return Expression::make_error(location); |
12557 | } | |
12558 | ||
12559 | bool is_ambiguous; | |
12560 | Method* method = nt->method_function(name, &is_ambiguous); | |
ab1468c3 | 12561 | const Typed_identifier* imethod = NULL; |
dcc8506b | 12562 | if (method == NULL && !is_pointer) |
ab1468c3 | 12563 | { |
12564 | Interface_type* it = nt->interface_type(); | |
12565 | if (it != NULL) | |
12566 | imethod = it->find_method(name); | |
12567 | } | |
12568 | ||
f03a9fbf | 12569 | if ((method == NULL && imethod == NULL) |
868b439e | 12570 | || (left_type->named_type() != NULL && left_type->points_to() != NULL)) |
e440a328 | 12571 | { |
12572 | if (!is_ambiguous) | |
631d5788 | 12573 | go_error_at(location, "type %<%s%s%> has no method %<%s%>", |
12574 | is_pointer ? "*" : "", | |
12575 | nt->message_name().c_str(), | |
12576 | Gogo::message_name(name).c_str()); | |
e440a328 | 12577 | else |
631d5788 | 12578 | go_error_at(location, "method %<%s%s%> is ambiguous in type %<%s%>", |
12579 | Gogo::message_name(name).c_str(), | |
12580 | is_pointer ? "*" : "", | |
12581 | nt->message_name().c_str()); | |
e440a328 | 12582 | return Expression::make_error(location); |
12583 | } | |
12584 | ||
ab1468c3 | 12585 | if (method != NULL && !is_pointer && !method->is_value_method()) |
e440a328 | 12586 | { |
631d5788 | 12587 | go_error_at(location, "method requires pointer (use %<(*%s).%s%>)", |
12588 | nt->message_name().c_str(), | |
12589 | Gogo::message_name(name).c_str()); | |
e440a328 | 12590 | return Expression::make_error(location); |
12591 | } | |
12592 | ||
12593 | // Build a new function type in which the receiver becomes the first | |
12594 | // argument. | |
ab1468c3 | 12595 | Function_type* method_type; |
12596 | if (method != NULL) | |
12597 | { | |
12598 | method_type = method->type(); | |
c484d925 | 12599 | go_assert(method_type->is_method()); |
ab1468c3 | 12600 | } |
12601 | else | |
12602 | { | |
12603 | method_type = imethod->type()->function_type(); | |
c484d925 | 12604 | go_assert(method_type != NULL && !method_type->is_method()); |
ab1468c3 | 12605 | } |
e440a328 | 12606 | |
12607 | const char* const receiver_name = "$this"; | |
12608 | Typed_identifier_list* parameters = new Typed_identifier_list(); | |
12609 | parameters->push_back(Typed_identifier(receiver_name, this->left_->type(), | |
12610 | location)); | |
12611 | ||
12612 | const Typed_identifier_list* method_parameters = method_type->parameters(); | |
12613 | if (method_parameters != NULL) | |
12614 | { | |
f470da59 | 12615 | int i = 0; |
e440a328 | 12616 | for (Typed_identifier_list::const_iterator p = method_parameters->begin(); |
12617 | p != method_parameters->end(); | |
f470da59 | 12618 | ++p, ++i) |
12619 | { | |
68883531 | 12620 | if (!p->name().empty()) |
f470da59 | 12621 | parameters->push_back(*p); |
12622 | else | |
12623 | { | |
12624 | char buf[20]; | |
12625 | snprintf(buf, sizeof buf, "$param%d", i); | |
12626 | parameters->push_back(Typed_identifier(buf, p->type(), | |
12627 | p->location())); | |
12628 | } | |
12629 | } | |
e440a328 | 12630 | } |
12631 | ||
12632 | const Typed_identifier_list* method_results = method_type->results(); | |
12633 | Typed_identifier_list* results; | |
12634 | if (method_results == NULL) | |
12635 | results = NULL; | |
12636 | else | |
12637 | { | |
12638 | results = new Typed_identifier_list(); | |
12639 | for (Typed_identifier_list::const_iterator p = method_results->begin(); | |
12640 | p != method_results->end(); | |
12641 | ++p) | |
12642 | results->push_back(*p); | |
12643 | } | |
f03a9fbf | 12644 | |
e440a328 | 12645 | Function_type* fntype = Type::make_function_type(NULL, parameters, results, |
12646 | location); | |
12647 | if (method_type->is_varargs()) | |
12648 | fntype->set_is_varargs(); | |
12649 | ||
12650 | // We generate methods which always takes a pointer to the receiver | |
12651 | // as their first argument. If this is for a pointer type, we can | |
12652 | // simply reuse the existing function. We use an internal hack to | |
12653 | // get the right type. | |
8381eda7 | 12654 | // FIXME: This optimization is disabled because it doesn't yet work |
12655 | // with function descriptors when the method expression is not | |
12656 | // directly called. | |
12657 | if (method != NULL && is_pointer && false) | |
e440a328 | 12658 | { |
12659 | Named_object* mno = (method->needs_stub_method() | |
12660 | ? method->stub_object() | |
12661 | : method->named_object()); | |
12662 | Expression* f = Expression::make_func_reference(mno, NULL, location); | |
12663 | f = Expression::make_cast(fntype, f, location); | |
12664 | Type_conversion_expression* tce = | |
12665 | static_cast<Type_conversion_expression*>(f); | |
12666 | tce->set_may_convert_function_types(); | |
12667 | return f; | |
12668 | } | |
12669 | ||
13f2fdb8 | 12670 | Named_object* no = gogo->start_function(gogo->thunk_name(), fntype, false, |
e440a328 | 12671 | location); |
12672 | ||
12673 | Named_object* vno = gogo->lookup(receiver_name, NULL); | |
c484d925 | 12674 | go_assert(vno != NULL); |
e440a328 | 12675 | Expression* ve = Expression::make_var_reference(vno, location); |
ab1468c3 | 12676 | Expression* bm; |
12677 | if (method != NULL) | |
12678 | bm = Type::bind_field_or_method(gogo, nt, ve, name, location); | |
12679 | else | |
12680 | bm = Expression::make_interface_field_reference(ve, name, location); | |
f690b0bb | 12681 | |
12682 | // Even though we found the method above, if it has an error type we | |
12683 | // may see an error here. | |
12684 | if (bm->is_error_expression()) | |
463fe805 | 12685 | { |
12686 | gogo->finish_function(location); | |
12687 | return bm; | |
12688 | } | |
e440a328 | 12689 | |
12690 | Expression_list* args; | |
f470da59 | 12691 | if (parameters->size() <= 1) |
e440a328 | 12692 | args = NULL; |
12693 | else | |
12694 | { | |
12695 | args = new Expression_list(); | |
f470da59 | 12696 | Typed_identifier_list::const_iterator p = parameters->begin(); |
12697 | ++p; | |
12698 | for (; p != parameters->end(); ++p) | |
e440a328 | 12699 | { |
12700 | vno = gogo->lookup(p->name(), NULL); | |
c484d925 | 12701 | go_assert(vno != NULL); |
e440a328 | 12702 | args->push_back(Expression::make_var_reference(vno, location)); |
12703 | } | |
12704 | } | |
12705 | ||
ceeb4318 | 12706 | gogo->start_block(location); |
12707 | ||
e440a328 | 12708 | Call_expression* call = Expression::make_call(bm, args, |
12709 | method_type->is_varargs(), | |
12710 | location); | |
12711 | ||
0afbb937 | 12712 | Statement* s = Statement::make_return_from_call(call, location); |
e440a328 | 12713 | gogo->add_statement(s); |
12714 | ||
ceeb4318 | 12715 | Block* b = gogo->finish_block(location); |
12716 | ||
12717 | gogo->add_block(b, location); | |
12718 | ||
12719 | // Lower the call in case there are multiple results. | |
12720 | gogo->lower_block(no, b); | |
a32698ee | 12721 | gogo->flatten_block(no, b); |
ceeb4318 | 12722 | |
e440a328 | 12723 | gogo->finish_function(location); |
12724 | ||
12725 | return Expression::make_func_reference(no, NULL, location); | |
12726 | } | |
12727 | ||
d751bb78 | 12728 | // Dump the ast for a selector expression. |
12729 | ||
12730 | void | |
f03a9fbf | 12731 | Selector_expression::do_dump_expression(Ast_dump_context* ast_dump_context) |
d751bb78 | 12732 | const |
12733 | { | |
12734 | ast_dump_context->dump_expression(this->left_); | |
12735 | ast_dump_context->ostream() << "."; | |
12736 | ast_dump_context->ostream() << this->name_; | |
12737 | } | |
f03a9fbf | 12738 | |
e440a328 | 12739 | // Make a selector expression. |
12740 | ||
12741 | Expression* | |
12742 | Expression::make_selector(Expression* left, const std::string& name, | |
b13c66cd | 12743 | Location location) |
e440a328 | 12744 | { |
12745 | return new Selector_expression(left, name, location); | |
12746 | } | |
12747 | ||
da244e59 | 12748 | // Class Allocation_expression. |
e440a328 | 12749 | |
da244e59 | 12750 | int |
12751 | Allocation_expression::do_traverse(Traverse* traverse) | |
e440a328 | 12752 | { |
da244e59 | 12753 | return Type::traverse(this->type_, traverse); |
12754 | } | |
e440a328 | 12755 | |
da244e59 | 12756 | Type* |
12757 | Allocation_expression::do_type() | |
12758 | { | |
12759 | return Type::make_pointer_type(this->type_); | |
12760 | } | |
e440a328 | 12761 | |
22deed0d | 12762 | void |
12763 | Allocation_expression::do_check_types(Gogo*) | |
12764 | { | |
12765 | if (!this->type_->in_heap()) | |
12766 | go_error_at(this->location(), "can't heap allocate go:notinheap type"); | |
12767 | } | |
12768 | ||
da244e59 | 12769 | // Make a copy of an allocation expression. |
e440a328 | 12770 | |
da244e59 | 12771 | Expression* |
12772 | Allocation_expression::do_copy() | |
12773 | { | |
12774 | Allocation_expression* alloc = | |
de590a61 | 12775 | new Allocation_expression(this->type_->copy_expressions(), |
12776 | this->location()); | |
da244e59 | 12777 | if (this->allocate_on_stack_) |
12778 | alloc->set_allocate_on_stack(); | |
12779 | return alloc; | |
12780 | } | |
e440a328 | 12781 | |
ea664253 | 12782 | // Return the backend representation for an allocation expression. |
e440a328 | 12783 | |
ea664253 | 12784 | Bexpression* |
12785 | Allocation_expression::do_get_backend(Translate_context* context) | |
e440a328 | 12786 | { |
2c809f8f | 12787 | Gogo* gogo = context->gogo(); |
12788 | Location loc = this->location(); | |
06e83d10 | 12789 | Btype* btype = this->type_->get_backend(gogo); |
da244e59 | 12790 | |
5973ede0 | 12791 | if (this->allocate_on_stack_) |
da244e59 | 12792 | { |
2a305b85 | 12793 | int64_t size; |
12794 | bool ok = this->type_->backend_type_size(gogo, &size); | |
12795 | if (!ok) | |
12796 | { | |
12797 | go_assert(saw_errors()); | |
12798 | return gogo->backend()->error_expression(); | |
12799 | } | |
06e83d10 | 12800 | Bstatement* decl; |
12801 | Named_object* fn = context->function(); | |
12802 | go_assert(fn != NULL); | |
12803 | Bfunction* fndecl = fn->func_value()->get_or_make_decl(gogo, fn); | |
12804 | Bexpression* zero = gogo->backend()->zero_expression(btype); | |
12805 | Bvariable* temp = | |
12806 | gogo->backend()->temporary_variable(fndecl, context->bblock(), btype, | |
12807 | zero, true, loc, &decl); | |
12808 | Bexpression* ret = gogo->backend()->var_expression(temp, loc); | |
12809 | ret = gogo->backend()->address_expression(ret, loc); | |
12810 | ret = gogo->backend()->compound_expression(decl, ret, loc); | |
12811 | return ret; | |
da244e59 | 12812 | } |
12813 | ||
2a305b85 | 12814 | Bexpression* space = |
ea664253 | 12815 | gogo->allocate_memory(this->type_, loc)->get_backend(context); |
d5d1c295 | 12816 | Btype* pbtype = gogo->backend()->pointer_type(btype); |
ea664253 | 12817 | return gogo->backend()->convert_expression(pbtype, space, loc); |
e440a328 | 12818 | } |
12819 | ||
d751bb78 | 12820 | // Dump ast representation for an allocation expression. |
12821 | ||
12822 | void | |
f03a9fbf | 12823 | Allocation_expression::do_dump_expression(Ast_dump_context* ast_dump_context) |
d751bb78 | 12824 | const |
12825 | { | |
12826 | ast_dump_context->ostream() << "new("; | |
12827 | ast_dump_context->dump_type(this->type_); | |
12828 | ast_dump_context->ostream() << ")"; | |
12829 | } | |
12830 | ||
e440a328 | 12831 | // Make an allocation expression. |
12832 | ||
12833 | Expression* | |
b13c66cd | 12834 | Expression::make_allocation(Type* type, Location location) |
e440a328 | 12835 | { |
12836 | return new Allocation_expression(type, location); | |
12837 | } | |
12838 | ||
e32de7ba | 12839 | // Class Ordered_value_list. |
e440a328 | 12840 | |
12841 | int | |
e32de7ba | 12842 | Ordered_value_list::traverse_vals(Traverse* traverse) |
e440a328 | 12843 | { |
0c4f5a19 | 12844 | if (this->vals_ != NULL) |
12845 | { | |
12846 | if (this->traverse_order_ == NULL) | |
12847 | { | |
12848 | if (this->vals_->traverse(traverse) == TRAVERSE_EXIT) | |
12849 | return TRAVERSE_EXIT; | |
12850 | } | |
12851 | else | |
12852 | { | |
e32de7ba | 12853 | for (std::vector<unsigned long>::const_iterator p = |
12854 | this->traverse_order_->begin(); | |
0c4f5a19 | 12855 | p != this->traverse_order_->end(); |
12856 | ++p) | |
12857 | { | |
12858 | if (Expression::traverse(&this->vals_->at(*p), traverse) | |
12859 | == TRAVERSE_EXIT) | |
12860 | return TRAVERSE_EXIT; | |
12861 | } | |
12862 | } | |
12863 | } | |
e32de7ba | 12864 | return TRAVERSE_CONTINUE; |
12865 | } | |
12866 | ||
12867 | // Class Struct_construction_expression. | |
12868 | ||
12869 | // Traversal. | |
12870 | ||
12871 | int | |
12872 | Struct_construction_expression::do_traverse(Traverse* traverse) | |
12873 | { | |
12874 | if (this->traverse_vals(traverse) == TRAVERSE_EXIT) | |
12875 | return TRAVERSE_EXIT; | |
e440a328 | 12876 | if (Type::traverse(this->type_, traverse) == TRAVERSE_EXIT) |
12877 | return TRAVERSE_EXIT; | |
12878 | return TRAVERSE_CONTINUE; | |
12879 | } | |
12880 | ||
12881 | // Return whether this is a constant initializer. | |
12882 | ||
12883 | bool | |
12884 | Struct_construction_expression::is_constant_struct() const | |
12885 | { | |
e32de7ba | 12886 | if (this->vals() == NULL) |
e440a328 | 12887 | return true; |
e32de7ba | 12888 | for (Expression_list::const_iterator pv = this->vals()->begin(); |
12889 | pv != this->vals()->end(); | |
e440a328 | 12890 | ++pv) |
12891 | { | |
12892 | if (*pv != NULL | |
12893 | && !(*pv)->is_constant() | |
12894 | && (!(*pv)->is_composite_literal() | |
12895 | || (*pv)->is_nonconstant_composite_literal())) | |
12896 | return false; | |
12897 | } | |
12898 | ||
12899 | const Struct_field_list* fields = this->type_->struct_type()->fields(); | |
12900 | for (Struct_field_list::const_iterator pf = fields->begin(); | |
12901 | pf != fields->end(); | |
12902 | ++pf) | |
12903 | { | |
12904 | // There are no constant constructors for interfaces. | |
12905 | if (pf->type()->interface_type() != NULL) | |
12906 | return false; | |
12907 | } | |
12908 | ||
12909 | return true; | |
12910 | } | |
12911 | ||
3ae06f68 | 12912 | // Return whether this struct can be used as a constant initializer. |
f9ca30f9 | 12913 | |
12914 | bool | |
3ae06f68 | 12915 | Struct_construction_expression::do_is_static_initializer() const |
f9ca30f9 | 12916 | { |
e32de7ba | 12917 | if (this->vals() == NULL) |
f9ca30f9 | 12918 | return true; |
e32de7ba | 12919 | for (Expression_list::const_iterator pv = this->vals()->begin(); |
12920 | pv != this->vals()->end(); | |
f9ca30f9 | 12921 | ++pv) |
12922 | { | |
3ae06f68 | 12923 | if (*pv != NULL && !(*pv)->is_static_initializer()) |
f9ca30f9 | 12924 | return false; |
12925 | } | |
de048538 | 12926 | |
12927 | const Struct_field_list* fields = this->type_->struct_type()->fields(); | |
12928 | for (Struct_field_list::const_iterator pf = fields->begin(); | |
12929 | pf != fields->end(); | |
12930 | ++pf) | |
12931 | { | |
12932 | // There are no constant constructors for interfaces. | |
12933 | if (pf->type()->interface_type() != NULL) | |
12934 | return false; | |
12935 | } | |
12936 | ||
f9ca30f9 | 12937 | return true; |
12938 | } | |
12939 | ||
e440a328 | 12940 | // Final type determination. |
12941 | ||
12942 | void | |
12943 | Struct_construction_expression::do_determine_type(const Type_context*) | |
12944 | { | |
e32de7ba | 12945 | if (this->vals() == NULL) |
e440a328 | 12946 | return; |
12947 | const Struct_field_list* fields = this->type_->struct_type()->fields(); | |
e32de7ba | 12948 | Expression_list::const_iterator pv = this->vals()->begin(); |
e440a328 | 12949 | for (Struct_field_list::const_iterator pf = fields->begin(); |
12950 | pf != fields->end(); | |
12951 | ++pf, ++pv) | |
12952 | { | |
e32de7ba | 12953 | if (pv == this->vals()->end()) |
e440a328 | 12954 | return; |
12955 | if (*pv != NULL) | |
12956 | { | |
12957 | Type_context subcontext(pf->type(), false); | |
12958 | (*pv)->determine_type(&subcontext); | |
12959 | } | |
12960 | } | |
a6cb4c0e | 12961 | // Extra values are an error we will report elsewhere; we still want |
12962 | // to determine the type to avoid knockon errors. | |
e32de7ba | 12963 | for (; pv != this->vals()->end(); ++pv) |
a6cb4c0e | 12964 | (*pv)->determine_type_no_context(); |
e440a328 | 12965 | } |
12966 | ||
12967 | // Check types. | |
12968 | ||
12969 | void | |
12970 | Struct_construction_expression::do_check_types(Gogo*) | |
12971 | { | |
e32de7ba | 12972 | if (this->vals() == NULL) |
e440a328 | 12973 | return; |
12974 | ||
12975 | Struct_type* st = this->type_->struct_type(); | |
e32de7ba | 12976 | if (this->vals()->size() > st->field_count()) |
e440a328 | 12977 | { |
12978 | this->report_error(_("too many expressions for struct")); | |
12979 | return; | |
12980 | } | |
12981 | ||
12982 | const Struct_field_list* fields = st->fields(); | |
e32de7ba | 12983 | Expression_list::const_iterator pv = this->vals()->begin(); |
e440a328 | 12984 | int i = 0; |
12985 | for (Struct_field_list::const_iterator pf = fields->begin(); | |
12986 | pf != fields->end(); | |
12987 | ++pf, ++pv, ++i) | |
12988 | { | |
e32de7ba | 12989 | if (pv == this->vals()->end()) |
e440a328 | 12990 | { |
12991 | this->report_error(_("too few expressions for struct")); | |
12992 | break; | |
12993 | } | |
12994 | ||
12995 | if (*pv == NULL) | |
12996 | continue; | |
12997 | ||
12998 | std::string reason; | |
12999 | if (!Type::are_assignable(pf->type(), (*pv)->type(), &reason)) | |
13000 | { | |
13001 | if (reason.empty()) | |
631d5788 | 13002 | go_error_at((*pv)->location(), |
13003 | "incompatible type for field %d in struct construction", | |
13004 | i + 1); | |
e440a328 | 13005 | else |
631d5788 | 13006 | go_error_at((*pv)->location(), |
13007 | ("incompatible type for field %d in " | |
13008 | "struct construction (%s)"), | |
13009 | i + 1, reason.c_str()); | |
e440a328 | 13010 | this->set_is_error(); |
13011 | } | |
13012 | } | |
e32de7ba | 13013 | go_assert(pv == this->vals()->end()); |
e440a328 | 13014 | } |
13015 | ||
de590a61 | 13016 | // Copy. |
13017 | ||
13018 | Expression* | |
13019 | Struct_construction_expression::do_copy() | |
13020 | { | |
13021 | Struct_construction_expression* ret = | |
13022 | new Struct_construction_expression(this->type_->copy_expressions(), | |
13023 | (this->vals() == NULL | |
13024 | ? NULL | |
13025 | : this->vals()->copy()), | |
13026 | this->location()); | |
13027 | if (this->traverse_order() != NULL) | |
13028 | ret->set_traverse_order(this->traverse_order()); | |
13029 | return ret; | |
13030 | } | |
13031 | ||
8ba8cc87 | 13032 | // Flatten a struct construction expression. Store the values into |
13033 | // temporaries in case they need interface conversion. | |
13034 | ||
13035 | Expression* | |
13036 | Struct_construction_expression::do_flatten(Gogo*, Named_object*, | |
13037 | Statement_inserter* inserter) | |
13038 | { | |
e32de7ba | 13039 | if (this->vals() == NULL) |
8ba8cc87 | 13040 | return this; |
13041 | ||
13042 | // If this is a constant struct, we don't need temporaries. | |
de048538 | 13043 | if (this->is_constant_struct() || this->is_static_initializer()) |
8ba8cc87 | 13044 | return this; |
13045 | ||
13046 | Location loc = this->location(); | |
e32de7ba | 13047 | for (Expression_list::iterator pv = this->vals()->begin(); |
13048 | pv != this->vals()->end(); | |
8ba8cc87 | 13049 | ++pv) |
13050 | { | |
13051 | if (*pv != NULL) | |
13052 | { | |
5bf8be8b | 13053 | if ((*pv)->is_error_expression() || (*pv)->type()->is_error_type()) |
13054 | { | |
13055 | go_assert(saw_errors()); | |
13056 | return Expression::make_error(loc); | |
13057 | } | |
8ba8cc87 | 13058 | if (!(*pv)->is_variable()) |
13059 | { | |
13060 | Temporary_statement* temp = | |
13061 | Statement::make_temporary(NULL, *pv, loc); | |
13062 | inserter->insert(temp); | |
13063 | *pv = Expression::make_temporary_reference(temp, loc); | |
13064 | } | |
13065 | } | |
13066 | } | |
13067 | return this; | |
13068 | } | |
13069 | ||
ea664253 | 13070 | // Return the backend representation for constructing a struct. |
e440a328 | 13071 | |
ea664253 | 13072 | Bexpression* |
13073 | Struct_construction_expression::do_get_backend(Translate_context* context) | |
e440a328 | 13074 | { |
13075 | Gogo* gogo = context->gogo(); | |
13076 | ||
2c809f8f | 13077 | Btype* btype = this->type_->get_backend(gogo); |
e32de7ba | 13078 | if (this->vals() == NULL) |
ea664253 | 13079 | return gogo->backend()->zero_expression(btype); |
e440a328 | 13080 | |
e440a328 | 13081 | const Struct_field_list* fields = this->type_->struct_type()->fields(); |
e32de7ba | 13082 | Expression_list::const_iterator pv = this->vals()->begin(); |
2c809f8f | 13083 | std::vector<Bexpression*> init; |
13084 | for (Struct_field_list::const_iterator pf = fields->begin(); | |
13085 | pf != fields->end(); | |
13086 | ++pf) | |
e440a328 | 13087 | { |
63697958 | 13088 | Btype* fbtype = pf->type()->get_backend(gogo); |
e32de7ba | 13089 | if (pv == this->vals()->end()) |
2c809f8f | 13090 | init.push_back(gogo->backend()->zero_expression(fbtype)); |
e440a328 | 13091 | else if (*pv == NULL) |
13092 | { | |
2c809f8f | 13093 | init.push_back(gogo->backend()->zero_expression(fbtype)); |
e440a328 | 13094 | ++pv; |
13095 | } | |
13096 | else | |
13097 | { | |
2c809f8f | 13098 | Expression* val = |
13099 | Expression::convert_for_assignment(gogo, pf->type(), | |
13100 | *pv, this->location()); | |
ea664253 | 13101 | init.push_back(val->get_backend(context)); |
e440a328 | 13102 | ++pv; |
13103 | } | |
e440a328 | 13104 | } |
0fdf8340 | 13105 | if (this->type_->struct_type()->has_padding()) |
13106 | { | |
13107 | // Feed an extra value if there is a padding field. | |
13108 | Btype *fbtype = Type::lookup_integer_type("uint8")->get_backend(gogo); | |
13109 | init.push_back(gogo->backend()->zero_expression(fbtype)); | |
13110 | } | |
ea664253 | 13111 | return gogo->backend()->constructor_expression(btype, init, this->location()); |
e440a328 | 13112 | } |
13113 | ||
13114 | // Export a struct construction. | |
13115 | ||
13116 | void | |
548be246 | 13117 | Struct_construction_expression::do_export(Export_function_body* efb) const |
e440a328 | 13118 | { |
204d4af4 | 13119 | efb->write_c_string("$convert("); |
548be246 | 13120 | efb->write_type(this->type_); |
e32de7ba | 13121 | for (Expression_list::const_iterator pv = this->vals()->begin(); |
13122 | pv != this->vals()->end(); | |
e440a328 | 13123 | ++pv) |
13124 | { | |
548be246 | 13125 | efb->write_c_string(", "); |
e440a328 | 13126 | if (*pv != NULL) |
548be246 | 13127 | (*pv)->export_expression(efb); |
e440a328 | 13128 | } |
548be246 | 13129 | efb->write_c_string(")"); |
e440a328 | 13130 | } |
13131 | ||
d751bb78 | 13132 | // Dump ast representation of a struct construction expression. |
13133 | ||
13134 | void | |
13135 | Struct_construction_expression::do_dump_expression( | |
13136 | Ast_dump_context* ast_dump_context) const | |
13137 | { | |
d751bb78 | 13138 | ast_dump_context->dump_type(this->type_); |
13139 | ast_dump_context->ostream() << "{"; | |
e32de7ba | 13140 | ast_dump_context->dump_expression_list(this->vals()); |
d751bb78 | 13141 | ast_dump_context->ostream() << "}"; |
13142 | } | |
13143 | ||
e440a328 | 13144 | // Make a struct composite literal. This used by the thunk code. |
13145 | ||
13146 | Expression* | |
13147 | Expression::make_struct_composite_literal(Type* type, Expression_list* vals, | |
b13c66cd | 13148 | Location location) |
e440a328 | 13149 | { |
c484d925 | 13150 | go_assert(type->struct_type() != NULL); |
e440a328 | 13151 | return new Struct_construction_expression(type, vals, location); |
13152 | } | |
13153 | ||
da244e59 | 13154 | // Class Array_construction_expression. |
e440a328 | 13155 | |
13156 | // Traversal. | |
13157 | ||
13158 | int | |
13159 | Array_construction_expression::do_traverse(Traverse* traverse) | |
13160 | { | |
e32de7ba | 13161 | if (this->traverse_vals(traverse) == TRAVERSE_EXIT) |
e440a328 | 13162 | return TRAVERSE_EXIT; |
13163 | if (Type::traverse(this->type_, traverse) == TRAVERSE_EXIT) | |
13164 | return TRAVERSE_EXIT; | |
13165 | return TRAVERSE_CONTINUE; | |
13166 | } | |
13167 | ||
13168 | // Return whether this is a constant initializer. | |
13169 | ||
13170 | bool | |
13171 | Array_construction_expression::is_constant_array() const | |
13172 | { | |
e32de7ba | 13173 | if (this->vals() == NULL) |
e440a328 | 13174 | return true; |
13175 | ||
13176 | // There are no constant constructors for interfaces. | |
13177 | if (this->type_->array_type()->element_type()->interface_type() != NULL) | |
13178 | return false; | |
13179 | ||
e32de7ba | 13180 | for (Expression_list::const_iterator pv = this->vals()->begin(); |
13181 | pv != this->vals()->end(); | |
e440a328 | 13182 | ++pv) |
13183 | { | |
13184 | if (*pv != NULL | |
13185 | && !(*pv)->is_constant() | |
13186 | && (!(*pv)->is_composite_literal() | |
13187 | || (*pv)->is_nonconstant_composite_literal())) | |
13188 | return false; | |
13189 | } | |
13190 | return true; | |
13191 | } | |
13192 | ||
3ae06f68 | 13193 | // Return whether this can be used a constant initializer. |
f9ca30f9 | 13194 | |
13195 | bool | |
3ae06f68 | 13196 | Array_construction_expression::do_is_static_initializer() const |
f9ca30f9 | 13197 | { |
e32de7ba | 13198 | if (this->vals() == NULL) |
f9ca30f9 | 13199 | return true; |
de048538 | 13200 | |
13201 | // There are no constant constructors for interfaces. | |
13202 | if (this->type_->array_type()->element_type()->interface_type() != NULL) | |
13203 | return false; | |
13204 | ||
e32de7ba | 13205 | for (Expression_list::const_iterator pv = this->vals()->begin(); |
13206 | pv != this->vals()->end(); | |
f9ca30f9 | 13207 | ++pv) |
13208 | { | |
3ae06f68 | 13209 | if (*pv != NULL && !(*pv)->is_static_initializer()) |
f9ca30f9 | 13210 | return false; |
13211 | } | |
13212 | return true; | |
13213 | } | |
13214 | ||
e440a328 | 13215 | // Final type determination. |
13216 | ||
13217 | void | |
13218 | Array_construction_expression::do_determine_type(const Type_context*) | |
13219 | { | |
e32de7ba | 13220 | if (this->vals() == NULL) |
e440a328 | 13221 | return; |
13222 | Type_context subcontext(this->type_->array_type()->element_type(), false); | |
e32de7ba | 13223 | for (Expression_list::const_iterator pv = this->vals()->begin(); |
13224 | pv != this->vals()->end(); | |
e440a328 | 13225 | ++pv) |
13226 | { | |
13227 | if (*pv != NULL) | |
13228 | (*pv)->determine_type(&subcontext); | |
13229 | } | |
13230 | } | |
13231 | ||
13232 | // Check types. | |
13233 | ||
13234 | void | |
13235 | Array_construction_expression::do_check_types(Gogo*) | |
13236 | { | |
e32de7ba | 13237 | if (this->vals() == NULL) |
e440a328 | 13238 | return; |
13239 | ||
13240 | Array_type* at = this->type_->array_type(); | |
13241 | int i = 0; | |
13242 | Type* element_type = at->element_type(); | |
e32de7ba | 13243 | for (Expression_list::const_iterator pv = this->vals()->begin(); |
13244 | pv != this->vals()->end(); | |
e440a328 | 13245 | ++pv, ++i) |
13246 | { | |
13247 | if (*pv != NULL | |
13248 | && !Type::are_assignable(element_type, (*pv)->type(), NULL)) | |
13249 | { | |
631d5788 | 13250 | go_error_at((*pv)->location(), |
13251 | "incompatible type for element %d in composite literal", | |
13252 | i + 1); | |
e440a328 | 13253 | this->set_is_error(); |
13254 | } | |
13255 | } | |
e440a328 | 13256 | } |
13257 | ||
8ba8cc87 | 13258 | // Flatten an array construction expression. Store the values into |
13259 | // temporaries in case they need interface conversion. | |
13260 | ||
13261 | Expression* | |
13262 | Array_construction_expression::do_flatten(Gogo*, Named_object*, | |
13263 | Statement_inserter* inserter) | |
13264 | { | |
e32de7ba | 13265 | if (this->vals() == NULL) |
8ba8cc87 | 13266 | return this; |
13267 | ||
13268 | // If this is a constant array, we don't need temporaries. | |
de048538 | 13269 | if (this->is_constant_array() || this->is_static_initializer()) |
8ba8cc87 | 13270 | return this; |
13271 | ||
13272 | Location loc = this->location(); | |
e32de7ba | 13273 | for (Expression_list::iterator pv = this->vals()->begin(); |
13274 | pv != this->vals()->end(); | |
8ba8cc87 | 13275 | ++pv) |
13276 | { | |
13277 | if (*pv != NULL) | |
13278 | { | |
5bf8be8b | 13279 | if ((*pv)->is_error_expression() || (*pv)->type()->is_error_type()) |
13280 | { | |
13281 | go_assert(saw_errors()); | |
13282 | return Expression::make_error(loc); | |
13283 | } | |
8ba8cc87 | 13284 | if (!(*pv)->is_variable()) |
13285 | { | |
13286 | Temporary_statement* temp = | |
13287 | Statement::make_temporary(NULL, *pv, loc); | |
13288 | inserter->insert(temp); | |
13289 | *pv = Expression::make_temporary_reference(temp, loc); | |
13290 | } | |
13291 | } | |
13292 | } | |
13293 | return this; | |
13294 | } | |
13295 | ||
2c809f8f | 13296 | // Get a constructor expression for the array values. |
e440a328 | 13297 | |
2c809f8f | 13298 | Bexpression* |
13299 | Array_construction_expression::get_constructor(Translate_context* context, | |
13300 | Btype* array_btype) | |
e440a328 | 13301 | { |
e440a328 | 13302 | Type* element_type = this->type_->array_type()->element_type(); |
2c809f8f | 13303 | |
13304 | std::vector<unsigned long> indexes; | |
13305 | std::vector<Bexpression*> vals; | |
13306 | Gogo* gogo = context->gogo(); | |
e32de7ba | 13307 | if (this->vals() != NULL) |
e440a328 | 13308 | { |
13309 | size_t i = 0; | |
ffe743ca | 13310 | std::vector<unsigned long>::const_iterator pi; |
13311 | if (this->indexes_ != NULL) | |
13312 | pi = this->indexes_->begin(); | |
e32de7ba | 13313 | for (Expression_list::const_iterator pv = this->vals()->begin(); |
13314 | pv != this->vals()->end(); | |
e440a328 | 13315 | ++pv, ++i) |
13316 | { | |
ffe743ca | 13317 | if (this->indexes_ != NULL) |
13318 | go_assert(pi != this->indexes_->end()); | |
ffe743ca | 13319 | |
13320 | if (this->indexes_ == NULL) | |
2c809f8f | 13321 | indexes.push_back(i); |
ffe743ca | 13322 | else |
2c809f8f | 13323 | indexes.push_back(*pi); |
e440a328 | 13324 | if (*pv == NULL) |
63697958 | 13325 | { |
63697958 | 13326 | Btype* ebtype = element_type->get_backend(gogo); |
13327 | Bexpression *zv = gogo->backend()->zero_expression(ebtype); | |
2c809f8f | 13328 | vals.push_back(zv); |
63697958 | 13329 | } |
e440a328 | 13330 | else |
13331 | { | |
2c809f8f | 13332 | Expression* val_expr = |
13333 | Expression::convert_for_assignment(gogo, element_type, *pv, | |
13334 | this->location()); | |
ea664253 | 13335 | vals.push_back(val_expr->get_backend(context)); |
e440a328 | 13336 | } |
ffe743ca | 13337 | if (this->indexes_ != NULL) |
13338 | ++pi; | |
e440a328 | 13339 | } |
ffe743ca | 13340 | if (this->indexes_ != NULL) |
13341 | go_assert(pi == this->indexes_->end()); | |
e440a328 | 13342 | } |
2c809f8f | 13343 | return gogo->backend()->array_constructor_expression(array_btype, indexes, |
13344 | vals, this->location()); | |
e440a328 | 13345 | } |
13346 | ||
13347 | // Export an array construction. | |
13348 | ||
13349 | void | |
548be246 | 13350 | Array_construction_expression::do_export(Export_function_body* efb) const |
e440a328 | 13351 | { |
204d4af4 | 13352 | efb->write_c_string("$convert("); |
548be246 | 13353 | efb->write_type(this->type_); |
e32de7ba | 13354 | if (this->vals() != NULL) |
e440a328 | 13355 | { |
ffe743ca | 13356 | std::vector<unsigned long>::const_iterator pi; |
13357 | if (this->indexes_ != NULL) | |
13358 | pi = this->indexes_->begin(); | |
e32de7ba | 13359 | for (Expression_list::const_iterator pv = this->vals()->begin(); |
13360 | pv != this->vals()->end(); | |
e440a328 | 13361 | ++pv) |
13362 | { | |
548be246 | 13363 | efb->write_c_string(", "); |
ffe743ca | 13364 | |
13365 | if (this->indexes_ != NULL) | |
13366 | { | |
13367 | char buf[100]; | |
13368 | snprintf(buf, sizeof buf, "%lu", *pi); | |
548be246 | 13369 | efb->write_c_string(buf); |
13370 | efb->write_c_string(":"); | |
ffe743ca | 13371 | } |
13372 | ||
e440a328 | 13373 | if (*pv != NULL) |
548be246 | 13374 | (*pv)->export_expression(efb); |
ffe743ca | 13375 | |
13376 | if (this->indexes_ != NULL) | |
13377 | ++pi; | |
e440a328 | 13378 | } |
13379 | } | |
548be246 | 13380 | efb->write_c_string(")"); |
e440a328 | 13381 | } |
13382 | ||
0e9a2e72 | 13383 | // Dump ast representation of an array construction expression. |
d751bb78 | 13384 | |
13385 | void | |
13386 | Array_construction_expression::do_dump_expression( | |
13387 | Ast_dump_context* ast_dump_context) const | |
13388 | { | |
ffe743ca | 13389 | Expression* length = this->type_->array_type()->length(); |
8b1c301d | 13390 | |
13391 | ast_dump_context->ostream() << "[" ; | |
13392 | if (length != NULL) | |
13393 | { | |
13394 | ast_dump_context->dump_expression(length); | |
13395 | } | |
13396 | ast_dump_context->ostream() << "]" ; | |
d751bb78 | 13397 | ast_dump_context->dump_type(this->type_); |
0e9a2e72 | 13398 | this->dump_slice_storage_expression(ast_dump_context); |
d751bb78 | 13399 | ast_dump_context->ostream() << "{" ; |
ffe743ca | 13400 | if (this->indexes_ == NULL) |
e32de7ba | 13401 | ast_dump_context->dump_expression_list(this->vals()); |
ffe743ca | 13402 | else |
13403 | { | |
e32de7ba | 13404 | Expression_list::const_iterator pv = this->vals()->begin(); |
ffe743ca | 13405 | for (std::vector<unsigned long>::const_iterator pi = |
13406 | this->indexes_->begin(); | |
13407 | pi != this->indexes_->end(); | |
13408 | ++pi, ++pv) | |
13409 | { | |
13410 | if (pi != this->indexes_->begin()) | |
13411 | ast_dump_context->ostream() << ", "; | |
13412 | ast_dump_context->ostream() << *pi << ':'; | |
13413 | ast_dump_context->dump_expression(*pv); | |
13414 | } | |
13415 | } | |
d751bb78 | 13416 | ast_dump_context->ostream() << "}" ; |
13417 | ||
13418 | } | |
13419 | ||
da244e59 | 13420 | // Class Fixed_array_construction_expression. |
e440a328 | 13421 | |
da244e59 | 13422 | Fixed_array_construction_expression::Fixed_array_construction_expression( |
13423 | Type* type, const std::vector<unsigned long>* indexes, | |
13424 | Expression_list* vals, Location location) | |
13425 | : Array_construction_expression(EXPRESSION_FIXED_ARRAY_CONSTRUCTION, | |
13426 | type, indexes, vals, location) | |
13427 | { go_assert(type->array_type() != NULL && !type->is_slice_type()); } | |
e440a328 | 13428 | |
de590a61 | 13429 | |
13430 | // Copy. | |
13431 | ||
13432 | Expression* | |
13433 | Fixed_array_construction_expression::do_copy() | |
13434 | { | |
13435 | Type* t = this->type()->copy_expressions(); | |
13436 | return new Fixed_array_construction_expression(t, this->indexes(), | |
13437 | (this->vals() == NULL | |
13438 | ? NULL | |
13439 | : this->vals()->copy()), | |
13440 | this->location()); | |
13441 | } | |
13442 | ||
ea664253 | 13443 | // Return the backend representation for constructing a fixed array. |
e440a328 | 13444 | |
ea664253 | 13445 | Bexpression* |
13446 | Fixed_array_construction_expression::do_get_backend(Translate_context* context) | |
e440a328 | 13447 | { |
9f0e0513 | 13448 | Type* type = this->type(); |
13449 | Btype* btype = type->get_backend(context->gogo()); | |
ea664253 | 13450 | return this->get_constructor(context, btype); |
e440a328 | 13451 | } |
13452 | ||
76f85fd6 | 13453 | Expression* |
13454 | Expression::make_array_composite_literal(Type* type, Expression_list* vals, | |
13455 | Location location) | |
13456 | { | |
13457 | go_assert(type->array_type() != NULL && !type->is_slice_type()); | |
13458 | return new Fixed_array_construction_expression(type, NULL, vals, location); | |
13459 | } | |
13460 | ||
da244e59 | 13461 | // Class Slice_construction_expression. |
e440a328 | 13462 | |
da244e59 | 13463 | Slice_construction_expression::Slice_construction_expression( |
13464 | Type* type, const std::vector<unsigned long>* indexes, | |
13465 | Expression_list* vals, Location location) | |
13466 | : Array_construction_expression(EXPRESSION_SLICE_CONSTRUCTION, | |
13467 | type, indexes, vals, location), | |
0e9a2e72 | 13468 | valtype_(NULL), array_val_(NULL), slice_storage_(NULL), |
13469 | storage_escapes_(true) | |
e440a328 | 13470 | { |
da244e59 | 13471 | go_assert(type->is_slice_type()); |
23d77f91 | 13472 | |
da244e59 | 13473 | unsigned long lenval; |
13474 | Expression* length; | |
13475 | if (vals == NULL || vals->empty()) | |
13476 | lenval = 0; | |
13477 | else | |
13478 | { | |
13479 | if (this->indexes() == NULL) | |
13480 | lenval = vals->size(); | |
13481 | else | |
13482 | lenval = indexes->back() + 1; | |
13483 | } | |
13484 | Type* int_type = Type::lookup_integer_type("int"); | |
13485 | length = Expression::make_integer_ul(lenval, int_type, location); | |
13486 | Type* element_type = type->array_type()->element_type(); | |
6bf4793c | 13487 | Array_type* array_type = Type::make_array_type(element_type, length); |
13488 | array_type->set_is_array_incomparable(); | |
13489 | this->valtype_ = array_type; | |
da244e59 | 13490 | } |
e440a328 | 13491 | |
23d77f91 | 13492 | // Traversal. |
13493 | ||
13494 | int | |
13495 | Slice_construction_expression::do_traverse(Traverse* traverse) | |
13496 | { | |
13497 | if (this->Array_construction_expression::do_traverse(traverse) | |
13498 | == TRAVERSE_EXIT) | |
13499 | return TRAVERSE_EXIT; | |
13500 | if (Type::traverse(this->valtype_, traverse) == TRAVERSE_EXIT) | |
13501 | return TRAVERSE_EXIT; | |
0e9a2e72 | 13502 | if (this->array_val_ != NULL |
13503 | && Expression::traverse(&this->array_val_, traverse) == TRAVERSE_EXIT) | |
13504 | return TRAVERSE_EXIT; | |
13505 | if (this->slice_storage_ != NULL | |
13506 | && Expression::traverse(&this->slice_storage_, traverse) == TRAVERSE_EXIT) | |
13507 | return TRAVERSE_EXIT; | |
23d77f91 | 13508 | return TRAVERSE_CONTINUE; |
13509 | } | |
13510 | ||
0e9a2e72 | 13511 | // Helper routine to create fixed array value underlying the slice literal. |
13512 | // May be called during flattening, or later during do_get_backend(). | |
e440a328 | 13513 | |
0e9a2e72 | 13514 | Expression* |
13515 | Slice_construction_expression::create_array_val() | |
e440a328 | 13516 | { |
f9c68f17 | 13517 | Array_type* array_type = this->type()->array_type(); |
13518 | if (array_type == NULL) | |
13519 | { | |
c484d925 | 13520 | go_assert(this->type()->is_error()); |
0e9a2e72 | 13521 | return NULL; |
f9c68f17 | 13522 | } |
13523 | ||
f23d7786 | 13524 | Location loc = this->location(); |
23d77f91 | 13525 | go_assert(this->valtype_ != NULL); |
3d60812e | 13526 | |
f23d7786 | 13527 | Expression_list* vals = this->vals(); |
0e9a2e72 | 13528 | return new Fixed_array_construction_expression( |
13529 | this->valtype_, this->indexes(), vals, loc); | |
13530 | } | |
13531 | ||
13532 | // If we're previous established that the slice storage does not | |
13533 | // escape, then create a separate array temp val here for it. We | |
13534 | // need to do this as part of flattening so as to be able to insert | |
13535 | // the new temp statement. | |
13536 | ||
13537 | Expression* | |
13538 | Slice_construction_expression::do_flatten(Gogo* gogo, Named_object* no, | |
13539 | Statement_inserter* inserter) | |
13540 | { | |
13541 | if (this->type()->array_type() == NULL) | |
13542 | return NULL; | |
13543 | ||
13544 | // Base class flattening first | |
13545 | this->Array_construction_expression::do_flatten(gogo, no, inserter); | |
13546 | ||
a1bbc2c3 | 13547 | // Create a stack-allocated storage temp if storage won't escape |
03118c21 | 13548 | if (!this->storage_escapes_ |
13549 | && this->slice_storage_ == NULL | |
13550 | && this->element_count() > 0) | |
0e9a2e72 | 13551 | { |
13552 | Location loc = this->location(); | |
03118c21 | 13553 | this->array_val_ = this->create_array_val(); |
0e9a2e72 | 13554 | go_assert(this->array_val_); |
13555 | Temporary_statement* temp = | |
13556 | Statement::make_temporary(this->valtype_, this->array_val_, loc); | |
13557 | inserter->insert(temp); | |
13558 | this->slice_storage_ = Expression::make_temporary_reference(temp, loc); | |
13559 | } | |
13560 | return this; | |
13561 | } | |
13562 | ||
13563 | // When dumping a slice construction expression that has an explicit | |
13564 | // storeage temp, emit the temp here (if we don't do this the storage | |
13565 | // temp appears unused in the AST dump). | |
13566 | ||
13567 | void | |
13568 | Slice_construction_expression:: | |
13569 | dump_slice_storage_expression(Ast_dump_context* ast_dump_context) const | |
13570 | { | |
13571 | if (this->slice_storage_ == NULL) | |
13572 | return; | |
13573 | ast_dump_context->ostream() << "storage=" ; | |
13574 | ast_dump_context->dump_expression(this->slice_storage_); | |
13575 | } | |
13576 | ||
de590a61 | 13577 | // Copy. |
13578 | ||
13579 | Expression* | |
13580 | Slice_construction_expression::do_copy() | |
13581 | { | |
13582 | return new Slice_construction_expression(this->type()->copy_expressions(), | |
13583 | this->indexes(), | |
13584 | (this->vals() == NULL | |
13585 | ? NULL | |
13586 | : this->vals()->copy()), | |
13587 | this->location()); | |
13588 | } | |
13589 | ||
0e9a2e72 | 13590 | // Return the backend representation for constructing a slice. |
13591 | ||
13592 | Bexpression* | |
13593 | Slice_construction_expression::do_get_backend(Translate_context* context) | |
13594 | { | |
13595 | if (this->array_val_ == NULL) | |
03118c21 | 13596 | this->array_val_ = this->create_array_val(); |
0e9a2e72 | 13597 | if (this->array_val_ == NULL) |
13598 | { | |
13599 | go_assert(this->type()->is_error()); | |
13600 | return context->backend()->error_expression(); | |
13601 | } | |
13602 | ||
13603 | Location loc = this->location(); | |
e440a328 | 13604 | |
3ae06f68 | 13605 | bool is_static_initializer = this->array_val_->is_static_initializer(); |
d8829beb | 13606 | |
13607 | // We have to copy the initial values into heap memory if we are in | |
3ae06f68 | 13608 | // a function or if the values are not constants. |
13609 | bool copy_to_heap = context->function() != NULL || !is_static_initializer; | |
e440a328 | 13610 | |
f23d7786 | 13611 | Expression* space; |
0e9a2e72 | 13612 | |
13613 | if (this->slice_storage_ != NULL) | |
13614 | { | |
13615 | go_assert(!this->storage_escapes_); | |
13616 | space = Expression::make_unary(OPERATOR_AND, this->slice_storage_, loc); | |
13617 | } | |
13618 | else if (!copy_to_heap) | |
e440a328 | 13619 | { |
f23d7786 | 13620 | // The initializer will only run once. |
0e9a2e72 | 13621 | space = Expression::make_unary(OPERATOR_AND, this->array_val_, loc); |
f23d7786 | 13622 | space->unary_expression()->set_is_slice_init(); |
e440a328 | 13623 | } |
13624 | else | |
45ff893b | 13625 | { |
5973ede0 | 13626 | go_assert(this->storage_escapes_ || this->element_count() == 0); |
0e9a2e72 | 13627 | space = Expression::make_heap_expression(this->array_val_, loc); |
45ff893b | 13628 | } |
d633d0fb | 13629 | Array_type* at = this->valtype_->array_type(); |
13630 | Type* et = at->element_type(); | |
13631 | space = Expression::make_unsafe_cast(Type::make_pointer_type(et), | |
13632 | space, loc); | |
e440a328 | 13633 | |
2c809f8f | 13634 | // Build a constructor for the slice. |
d633d0fb | 13635 | Expression* len = at->length(); |
f23d7786 | 13636 | Expression* slice_val = |
13637 | Expression::make_slice_value(this->type(), space, len, len, loc); | |
ea664253 | 13638 | return slice_val->get_backend(context); |
e440a328 | 13639 | } |
13640 | ||
13641 | // Make a slice composite literal. This is used by the type | |
13642 | // descriptor code. | |
13643 | ||
0e9a2e72 | 13644 | Slice_construction_expression* |
e440a328 | 13645 | Expression::make_slice_composite_literal(Type* type, Expression_list* vals, |
b13c66cd | 13646 | Location location) |
e440a328 | 13647 | { |
411eb89e | 13648 | go_assert(type->is_slice_type()); |
2c809f8f | 13649 | return new Slice_construction_expression(type, NULL, vals, location); |
e440a328 | 13650 | } |
13651 | ||
da244e59 | 13652 | // Class Map_construction_expression. |
e440a328 | 13653 | |
13654 | // Traversal. | |
13655 | ||
13656 | int | |
13657 | Map_construction_expression::do_traverse(Traverse* traverse) | |
13658 | { | |
13659 | if (this->vals_ != NULL | |
13660 | && this->vals_->traverse(traverse) == TRAVERSE_EXIT) | |
13661 | return TRAVERSE_EXIT; | |
13662 | if (Type::traverse(this->type_, traverse) == TRAVERSE_EXIT) | |
13663 | return TRAVERSE_EXIT; | |
13664 | return TRAVERSE_CONTINUE; | |
13665 | } | |
13666 | ||
2c809f8f | 13667 | // Flatten constructor initializer into a temporary variable since |
13668 | // we need to take its address for __go_construct_map. | |
13669 | ||
13670 | Expression* | |
13671 | Map_construction_expression::do_flatten(Gogo* gogo, Named_object*, | |
13672 | Statement_inserter* inserter) | |
13673 | { | |
13674 | if (!this->is_error_expression() | |
13675 | && this->vals_ != NULL | |
13676 | && !this->vals_->empty() | |
13677 | && this->constructor_temp_ == NULL) | |
13678 | { | |
13679 | Map_type* mt = this->type_->map_type(); | |
13680 | Type* key_type = mt->key_type(); | |
13681 | Type* val_type = mt->val_type(); | |
13682 | this->element_type_ = Type::make_builtin_struct_type(2, | |
13683 | "__key", key_type, | |
13684 | "__val", val_type); | |
13685 | ||
13686 | Expression_list* value_pairs = new Expression_list(); | |
13687 | Location loc = this->location(); | |
13688 | ||
13689 | size_t i = 0; | |
13690 | for (Expression_list::const_iterator pv = this->vals_->begin(); | |
13691 | pv != this->vals_->end(); | |
13692 | ++pv, ++i) | |
13693 | { | |
13694 | Expression_list* key_value_pair = new Expression_list(); | |
91c0fd76 | 13695 | Expression* key = *pv; |
5bf8be8b | 13696 | if (key->is_error_expression() || key->type()->is_error_type()) |
13697 | { | |
13698 | go_assert(saw_errors()); | |
13699 | return Expression::make_error(loc); | |
13700 | } | |
91c0fd76 | 13701 | if (key->type()->interface_type() != NULL && !key->is_variable()) |
13702 | { | |
13703 | Temporary_statement* temp = | |
13704 | Statement::make_temporary(NULL, key, loc); | |
13705 | inserter->insert(temp); | |
13706 | key = Expression::make_temporary_reference(temp, loc); | |
13707 | } | |
13708 | key = Expression::convert_for_assignment(gogo, key_type, key, loc); | |
2c809f8f | 13709 | |
13710 | ++pv; | |
91c0fd76 | 13711 | Expression* val = *pv; |
5bf8be8b | 13712 | if (val->is_error_expression() || val->type()->is_error_type()) |
13713 | { | |
13714 | go_assert(saw_errors()); | |
13715 | return Expression::make_error(loc); | |
13716 | } | |
91c0fd76 | 13717 | if (val->type()->interface_type() != NULL && !val->is_variable()) |
13718 | { | |
13719 | Temporary_statement* temp = | |
13720 | Statement::make_temporary(NULL, val, loc); | |
13721 | inserter->insert(temp); | |
13722 | val = Expression::make_temporary_reference(temp, loc); | |
13723 | } | |
13724 | val = Expression::convert_for_assignment(gogo, val_type, val, loc); | |
2c809f8f | 13725 | |
13726 | key_value_pair->push_back(key); | |
13727 | key_value_pair->push_back(val); | |
13728 | value_pairs->push_back( | |
13729 | Expression::make_struct_composite_literal(this->element_type_, | |
13730 | key_value_pair, loc)); | |
13731 | } | |
13732 | ||
e67508fa | 13733 | Expression* element_count = Expression::make_integer_ul(i, NULL, loc); |
6bf4793c | 13734 | Array_type* ctor_type = |
2c809f8f | 13735 | Type::make_array_type(this->element_type_, element_count); |
6bf4793c | 13736 | ctor_type->set_is_array_incomparable(); |
2c809f8f | 13737 | Expression* constructor = |
13738 | new Fixed_array_construction_expression(ctor_type, NULL, | |
13739 | value_pairs, loc); | |
13740 | ||
13741 | this->constructor_temp_ = | |
13742 | Statement::make_temporary(NULL, constructor, loc); | |
13743 | constructor->issue_nil_check(); | |
13744 | this->constructor_temp_->set_is_address_taken(); | |
13745 | inserter->insert(this->constructor_temp_); | |
13746 | } | |
13747 | ||
13748 | return this; | |
13749 | } | |
13750 | ||
e440a328 | 13751 | // Final type determination. |
13752 | ||
13753 | void | |
13754 | Map_construction_expression::do_determine_type(const Type_context*) | |
13755 | { | |
13756 | if (this->vals_ == NULL) | |
13757 | return; | |
13758 | ||
13759 | Map_type* mt = this->type_->map_type(); | |
13760 | Type_context key_context(mt->key_type(), false); | |
13761 | Type_context val_context(mt->val_type(), false); | |
13762 | for (Expression_list::const_iterator pv = this->vals_->begin(); | |
13763 | pv != this->vals_->end(); | |
13764 | ++pv) | |
13765 | { | |
13766 | (*pv)->determine_type(&key_context); | |
13767 | ++pv; | |
13768 | (*pv)->determine_type(&val_context); | |
13769 | } | |
13770 | } | |
13771 | ||
13772 | // Check types. | |
13773 | ||
13774 | void | |
13775 | Map_construction_expression::do_check_types(Gogo*) | |
13776 | { | |
13777 | if (this->vals_ == NULL) | |
13778 | return; | |
13779 | ||
13780 | Map_type* mt = this->type_->map_type(); | |
13781 | int i = 0; | |
13782 | Type* key_type = mt->key_type(); | |
13783 | Type* val_type = mt->val_type(); | |
13784 | for (Expression_list::const_iterator pv = this->vals_->begin(); | |
13785 | pv != this->vals_->end(); | |
13786 | ++pv, ++i) | |
13787 | { | |
13788 | if (!Type::are_assignable(key_type, (*pv)->type(), NULL)) | |
13789 | { | |
631d5788 | 13790 | go_error_at((*pv)->location(), |
13791 | "incompatible type for element %d key in map construction", | |
13792 | i + 1); | |
e440a328 | 13793 | this->set_is_error(); |
13794 | } | |
13795 | ++pv; | |
13796 | if (!Type::are_assignable(val_type, (*pv)->type(), NULL)) | |
13797 | { | |
631d5788 | 13798 | go_error_at((*pv)->location(), |
13799 | ("incompatible type for element %d value " | |
13800 | "in map construction"), | |
e440a328 | 13801 | i + 1); |
13802 | this->set_is_error(); | |
13803 | } | |
13804 | } | |
13805 | } | |
13806 | ||
de590a61 | 13807 | // Copy. |
13808 | ||
13809 | Expression* | |
13810 | Map_construction_expression::do_copy() | |
13811 | { | |
13812 | return new Map_construction_expression(this->type_->copy_expressions(), | |
13813 | (this->vals_ == NULL | |
13814 | ? NULL | |
13815 | : this->vals_->copy()), | |
13816 | this->location()); | |
13817 | } | |
13818 | ||
ea664253 | 13819 | // Return the backend representation for constructing a map. |
e440a328 | 13820 | |
ea664253 | 13821 | Bexpression* |
13822 | Map_construction_expression::do_get_backend(Translate_context* context) | |
e440a328 | 13823 | { |
2c809f8f | 13824 | if (this->is_error_expression()) |
ea664253 | 13825 | return context->backend()->error_expression(); |
2c809f8f | 13826 | Location loc = this->location(); |
e440a328 | 13827 | |
e440a328 | 13828 | size_t i = 0; |
2c809f8f | 13829 | Expression* ventries; |
e440a328 | 13830 | if (this->vals_ == NULL || this->vals_->empty()) |
2c809f8f | 13831 | ventries = Expression::make_nil(loc); |
e440a328 | 13832 | else |
13833 | { | |
2c809f8f | 13834 | go_assert(this->constructor_temp_ != NULL); |
13835 | i = this->vals_->size() / 2; | |
e440a328 | 13836 | |
2c809f8f | 13837 | Expression* ctor_ref = |
13838 | Expression::make_temporary_reference(this->constructor_temp_, loc); | |
13839 | ventries = Expression::make_unary(OPERATOR_AND, ctor_ref, loc); | |
13840 | } | |
e440a328 | 13841 | |
2c809f8f | 13842 | Map_type* mt = this->type_->map_type(); |
13843 | if (this->element_type_ == NULL) | |
13844 | this->element_type_ = | |
13845 | Type::make_builtin_struct_type(2, | |
13846 | "__key", mt->key_type(), | |
13847 | "__val", mt->val_type()); | |
0d5530d9 | 13848 | Expression* descriptor = Expression::make_type_descriptor(mt, loc); |
2c809f8f | 13849 | |
13850 | Type* uintptr_t = Type::lookup_integer_type("uintptr"); | |
e67508fa | 13851 | Expression* count = Expression::make_integer_ul(i, uintptr_t, loc); |
2c809f8f | 13852 | |
13853 | Expression* entry_size = | |
13854 | Expression::make_type_info(this->element_type_, TYPE_INFO_SIZE); | |
13855 | ||
13856 | unsigned int field_index; | |
13857 | const Struct_field* valfield = | |
13858 | this->element_type_->find_local_field("__val", &field_index); | |
13859 | Expression* val_offset = | |
13860 | Expression::make_struct_field_offset(this->element_type_, valfield); | |
2c809f8f | 13861 | |
13862 | Expression* map_ctor = | |
0d5530d9 | 13863 | Runtime::make_call(Runtime::CONSTRUCT_MAP, loc, 5, descriptor, count, |
13864 | entry_size, val_offset, ventries); | |
ea664253 | 13865 | return map_ctor->get_backend(context); |
2c809f8f | 13866 | } |
e440a328 | 13867 | |
2c809f8f | 13868 | // Export an array construction. |
e440a328 | 13869 | |
2c809f8f | 13870 | void |
548be246 | 13871 | Map_construction_expression::do_export(Export_function_body* efb) const |
2c809f8f | 13872 | { |
204d4af4 | 13873 | efb->write_c_string("$convert("); |
548be246 | 13874 | efb->write_type(this->type_); |
2c809f8f | 13875 | for (Expression_list::const_iterator pv = this->vals_->begin(); |
13876 | pv != this->vals_->end(); | |
13877 | ++pv) | |
13878 | { | |
548be246 | 13879 | efb->write_c_string(", "); |
13880 | (*pv)->export_expression(efb); | |
2c809f8f | 13881 | } |
548be246 | 13882 | efb->write_c_string(")"); |
2c809f8f | 13883 | } |
e440a328 | 13884 | |
2c809f8f | 13885 | // Dump ast representation for a map construction expression. |
d751bb78 | 13886 | |
13887 | void | |
13888 | Map_construction_expression::do_dump_expression( | |
13889 | Ast_dump_context* ast_dump_context) const | |
13890 | { | |
d751bb78 | 13891 | ast_dump_context->ostream() << "{" ; |
8b1c301d | 13892 | ast_dump_context->dump_expression_list(this->vals_, true); |
d751bb78 | 13893 | ast_dump_context->ostream() << "}"; |
13894 | } | |
13895 | ||
7795ac51 | 13896 | // Class Composite_literal_expression. |
e440a328 | 13897 | |
13898 | // Traversal. | |
13899 | ||
13900 | int | |
13901 | Composite_literal_expression::do_traverse(Traverse* traverse) | |
13902 | { | |
dbffccfc | 13903 | if (Type::traverse(this->type_, traverse) == TRAVERSE_EXIT) |
e440a328 | 13904 | return TRAVERSE_EXIT; |
dbffccfc | 13905 | |
13906 | // If this is a struct composite literal with keys, then the keys | |
13907 | // are field names, not expressions. We don't want to traverse them | |
13908 | // in that case. If we do, we can give an erroneous error "variable | |
13909 | // initializer refers to itself." See bug482.go in the testsuite. | |
13910 | if (this->has_keys_ && this->vals_ != NULL) | |
13911 | { | |
13912 | // The type may not be resolvable at this point. | |
13913 | Type* type = this->type_; | |
a01f2481 | 13914 | |
7795ac51 | 13915 | for (int depth = 0; depth < this->depth_; ++depth) |
a01f2481 | 13916 | { |
13917 | if (type->array_type() != NULL) | |
13918 | type = type->array_type()->element_type(); | |
13919 | else if (type->map_type() != NULL) | |
7795ac51 | 13920 | { |
13921 | if (this->key_path_[depth]) | |
13922 | type = type->map_type()->key_type(); | |
13923 | else | |
13924 | type = type->map_type()->val_type(); | |
13925 | } | |
a01f2481 | 13926 | else |
13927 | { | |
13928 | // This error will be reported during lowering. | |
13929 | return TRAVERSE_CONTINUE; | |
13930 | } | |
13931 | } | |
13932 | ||
dbffccfc | 13933 | while (true) |
13934 | { | |
13935 | if (type->classification() == Type::TYPE_NAMED) | |
13936 | type = type->named_type()->real_type(); | |
13937 | else if (type->classification() == Type::TYPE_FORWARD) | |
13938 | { | |
13939 | Type* t = type->forwarded(); | |
13940 | if (t == type) | |
13941 | break; | |
13942 | type = t; | |
13943 | } | |
13944 | else | |
13945 | break; | |
13946 | } | |
13947 | ||
13948 | if (type->classification() == Type::TYPE_STRUCT) | |
13949 | { | |
13950 | Expression_list::iterator p = this->vals_->begin(); | |
13951 | while (p != this->vals_->end()) | |
13952 | { | |
13953 | // Skip key. | |
13954 | ++p; | |
13955 | go_assert(p != this->vals_->end()); | |
13956 | if (Expression::traverse(&*p, traverse) == TRAVERSE_EXIT) | |
13957 | return TRAVERSE_EXIT; | |
13958 | ++p; | |
13959 | } | |
13960 | return TRAVERSE_CONTINUE; | |
13961 | } | |
13962 | } | |
13963 | ||
13964 | if (this->vals_ != NULL) | |
13965 | return this->vals_->traverse(traverse); | |
13966 | ||
13967 | return TRAVERSE_CONTINUE; | |
e440a328 | 13968 | } |
13969 | ||
13970 | // Lower a generic composite literal into a specific version based on | |
13971 | // the type. | |
13972 | ||
13973 | Expression* | |
ceeb4318 | 13974 | Composite_literal_expression::do_lower(Gogo* gogo, Named_object* function, |
13975 | Statement_inserter* inserter, int) | |
e440a328 | 13976 | { |
13977 | Type* type = this->type_; | |
13978 | ||
7795ac51 | 13979 | for (int depth = 0; depth < this->depth_; ++depth) |
e440a328 | 13980 | { |
67a2ed75 | 13981 | type = type->deref(); |
e440a328 | 13982 | if (type->array_type() != NULL) |
13983 | type = type->array_type()->element_type(); | |
13984 | else if (type->map_type() != NULL) | |
7795ac51 | 13985 | { |
13986 | if (this->key_path_[depth]) | |
13987 | type = type->map_type()->key_type(); | |
13988 | else | |
13989 | type = type->map_type()->val_type(); | |
13990 | } | |
e440a328 | 13991 | else |
13992 | { | |
5c13bd80 | 13993 | if (!type->is_error()) |
631d5788 | 13994 | go_error_at(this->location(), |
13995 | ("may only omit types within composite literals " | |
13996 | "of slice, array, or map type")); | |
e440a328 | 13997 | return Expression::make_error(this->location()); |
13998 | } | |
13999 | } | |
14000 | ||
e00772b3 | 14001 | Type *pt = type->points_to(); |
14002 | bool is_pointer = false; | |
14003 | if (pt != NULL) | |
14004 | { | |
14005 | is_pointer = true; | |
14006 | type = pt; | |
14007 | } | |
14008 | ||
14009 | Expression* ret; | |
5c13bd80 | 14010 | if (type->is_error()) |
e440a328 | 14011 | return Expression::make_error(this->location()); |
14012 | else if (type->struct_type() != NULL) | |
e00772b3 | 14013 | ret = this->lower_struct(gogo, type); |
e440a328 | 14014 | else if (type->array_type() != NULL) |
113ef6a5 | 14015 | ret = this->lower_array(type); |
e440a328 | 14016 | else if (type->map_type() != NULL) |
e00772b3 | 14017 | ret = this->lower_map(gogo, function, inserter, type); |
e440a328 | 14018 | else |
14019 | { | |
631d5788 | 14020 | go_error_at(this->location(), |
14021 | ("expected struct, slice, array, or map type " | |
14022 | "for composite literal")); | |
e440a328 | 14023 | return Expression::make_error(this->location()); |
14024 | } | |
e00772b3 | 14025 | |
14026 | if (is_pointer) | |
2c809f8f | 14027 | ret = Expression::make_heap_expression(ret, this->location()); |
e00772b3 | 14028 | |
14029 | return ret; | |
e440a328 | 14030 | } |
14031 | ||
14032 | // Lower a struct composite literal. | |
14033 | ||
14034 | Expression* | |
81c4b26b | 14035 | Composite_literal_expression::lower_struct(Gogo* gogo, Type* type) |
e440a328 | 14036 | { |
b13c66cd | 14037 | Location location = this->location(); |
e440a328 | 14038 | Struct_type* st = type->struct_type(); |
14039 | if (this->vals_ == NULL || !this->has_keys_) | |
07daa4e7 | 14040 | { |
e6013c28 | 14041 | if (this->vals_ != NULL |
14042 | && !this->vals_->empty() | |
14043 | && type->named_type() != NULL | |
14044 | && type->named_type()->named_object()->package() != NULL) | |
14045 | { | |
14046 | for (Struct_field_list::const_iterator pf = st->fields()->begin(); | |
14047 | pf != st->fields()->end(); | |
14048 | ++pf) | |
07daa4e7 | 14049 | { |
07ba7f26 | 14050 | if (Gogo::is_hidden_name(pf->field_name()) |
14051 | || pf->is_embedded_builtin(gogo)) | |
631d5788 | 14052 | go_error_at(this->location(), |
14053 | "assignment of unexported field %qs in %qs literal", | |
14054 | Gogo::message_name(pf->field_name()).c_str(), | |
14055 | type->named_type()->message_name().c_str()); | |
07daa4e7 | 14056 | } |
14057 | } | |
14058 | ||
14059 | return new Struct_construction_expression(type, this->vals_, location); | |
14060 | } | |
e440a328 | 14061 | |
14062 | size_t field_count = st->field_count(); | |
14063 | std::vector<Expression*> vals(field_count); | |
e32de7ba | 14064 | std::vector<unsigned long>* traverse_order = new(std::vector<unsigned long>); |
e440a328 | 14065 | Expression_list::const_iterator p = this->vals_->begin(); |
62750cd5 | 14066 | Expression* external_expr = NULL; |
14067 | const Named_object* external_no = NULL; | |
e440a328 | 14068 | while (p != this->vals_->end()) |
14069 | { | |
14070 | Expression* name_expr = *p; | |
14071 | ||
14072 | ++p; | |
c484d925 | 14073 | go_assert(p != this->vals_->end()); |
e440a328 | 14074 | Expression* val = *p; |
14075 | ||
14076 | ++p; | |
14077 | ||
14078 | if (name_expr == NULL) | |
14079 | { | |
631d5788 | 14080 | go_error_at(val->location(), |
14081 | "mixture of field and value initializers"); | |
e440a328 | 14082 | return Expression::make_error(location); |
14083 | } | |
14084 | ||
14085 | bool bad_key = false; | |
14086 | std::string name; | |
81c4b26b | 14087 | const Named_object* no = NULL; |
e440a328 | 14088 | switch (name_expr->classification()) |
14089 | { | |
14090 | case EXPRESSION_UNKNOWN_REFERENCE: | |
14091 | name = name_expr->unknown_expression()->name(); | |
7f7ce694 | 14092 | if (type->named_type() != NULL) |
14093 | { | |
14094 | // If the named object found for this field name comes from a | |
14095 | // different package than the struct it is a part of, do not count | |
14096 | // this incorrect lookup as a usage of the object's package. | |
14097 | no = name_expr->unknown_expression()->named_object(); | |
14098 | if (no->package() != NULL | |
14099 | && no->package() != type->named_type()->named_object()->package()) | |
14100 | no->package()->forget_usage(name_expr); | |
14101 | } | |
e440a328 | 14102 | break; |
14103 | ||
14104 | case EXPRESSION_CONST_REFERENCE: | |
81c4b26b | 14105 | no = static_cast<Const_expression*>(name_expr)->named_object(); |
e440a328 | 14106 | break; |
14107 | ||
14108 | case EXPRESSION_TYPE: | |
14109 | { | |
14110 | Type* t = name_expr->type(); | |
14111 | Named_type* nt = t->named_type(); | |
14112 | if (nt == NULL) | |
14113 | bad_key = true; | |
14114 | else | |
81c4b26b | 14115 | no = nt->named_object(); |
e440a328 | 14116 | } |
14117 | break; | |
14118 | ||
14119 | case EXPRESSION_VAR_REFERENCE: | |
81c4b26b | 14120 | no = name_expr->var_expression()->named_object(); |
e440a328 | 14121 | break; |
14122 | ||
b0c09712 | 14123 | case EXPRESSION_ENCLOSED_VAR_REFERENCE: |
14124 | no = name_expr->enclosed_var_expression()->variable(); | |
e440a328 | 14125 | break; |
14126 | ||
b0c09712 | 14127 | case EXPRESSION_FUNC_REFERENCE: |
14128 | no = name_expr->func_expression()->named_object(); | |
e440a328 | 14129 | break; |
14130 | ||
14131 | default: | |
14132 | bad_key = true; | |
14133 | break; | |
14134 | } | |
14135 | if (bad_key) | |
14136 | { | |
631d5788 | 14137 | go_error_at(name_expr->location(), "expected struct field name"); |
e440a328 | 14138 | return Expression::make_error(location); |
14139 | } | |
14140 | ||
81c4b26b | 14141 | if (no != NULL) |
14142 | { | |
62750cd5 | 14143 | if (no->package() != NULL && external_expr == NULL) |
14144 | { | |
14145 | external_expr = name_expr; | |
14146 | external_no = no; | |
14147 | } | |
14148 | ||
81c4b26b | 14149 | name = no->name(); |
14150 | ||
14151 | // A predefined name won't be packed. If it starts with a | |
14152 | // lower case letter we need to check for that case, because | |
2d29d278 | 14153 | // the field name will be packed. FIXME. |
81c4b26b | 14154 | if (!Gogo::is_hidden_name(name) |
14155 | && name[0] >= 'a' | |
14156 | && name[0] <= 'z') | |
14157 | { | |
14158 | Named_object* gno = gogo->lookup_global(name.c_str()); | |
14159 | if (gno == no) | |
14160 | name = gogo->pack_hidden_name(name, false); | |
14161 | } | |
14162 | } | |
14163 | ||
e440a328 | 14164 | unsigned int index; |
14165 | const Struct_field* sf = st->find_local_field(name, &index); | |
14166 | if (sf == NULL) | |
14167 | { | |
631d5788 | 14168 | go_error_at(name_expr->location(), "unknown field %qs in %qs", |
14169 | Gogo::message_name(name).c_str(), | |
14170 | (type->named_type() != NULL | |
14171 | ? type->named_type()->message_name().c_str() | |
14172 | : "unnamed struct")); | |
e440a328 | 14173 | return Expression::make_error(location); |
14174 | } | |
14175 | if (vals[index] != NULL) | |
14176 | { | |
631d5788 | 14177 | go_error_at(name_expr->location(), |
14178 | "duplicate value for field %qs in %qs", | |
14179 | Gogo::message_name(name).c_str(), | |
14180 | (type->named_type() != NULL | |
14181 | ? type->named_type()->message_name().c_str() | |
14182 | : "unnamed struct")); | |
e440a328 | 14183 | return Expression::make_error(location); |
14184 | } | |
14185 | ||
07daa4e7 | 14186 | if (type->named_type() != NULL |
14187 | && type->named_type()->named_object()->package() != NULL | |
07ba7f26 | 14188 | && (Gogo::is_hidden_name(sf->field_name()) |
14189 | || sf->is_embedded_builtin(gogo))) | |
631d5788 | 14190 | go_error_at(name_expr->location(), |
14191 | "assignment of unexported field %qs in %qs literal", | |
14192 | Gogo::message_name(sf->field_name()).c_str(), | |
14193 | type->named_type()->message_name().c_str()); | |
07daa4e7 | 14194 | |
e440a328 | 14195 | vals[index] = val; |
e32de7ba | 14196 | traverse_order->push_back(static_cast<unsigned long>(index)); |
e440a328 | 14197 | } |
14198 | ||
62750cd5 | 14199 | if (!this->all_are_names_) |
14200 | { | |
14201 | // This is a weird case like bug462 in the testsuite. | |
14202 | if (external_expr == NULL) | |
631d5788 | 14203 | go_error_at(this->location(), "unknown field in %qs literal", |
14204 | (type->named_type() != NULL | |
14205 | ? type->named_type()->message_name().c_str() | |
14206 | : "unnamed struct")); | |
62750cd5 | 14207 | else |
631d5788 | 14208 | go_error_at(external_expr->location(), "unknown field %qs in %qs", |
14209 | external_no->message_name().c_str(), | |
14210 | (type->named_type() != NULL | |
14211 | ? type->named_type()->message_name().c_str() | |
14212 | : "unnamed struct")); | |
62750cd5 | 14213 | return Expression::make_error(location); |
14214 | } | |
14215 | ||
e440a328 | 14216 | Expression_list* list = new Expression_list; |
14217 | list->reserve(field_count); | |
14218 | for (size_t i = 0; i < field_count; ++i) | |
14219 | list->push_back(vals[i]); | |
14220 | ||
0c4f5a19 | 14221 | Struct_construction_expression* ret = |
14222 | new Struct_construction_expression(type, list, location); | |
14223 | ret->set_traverse_order(traverse_order); | |
14224 | return ret; | |
e440a328 | 14225 | } |
14226 | ||
e32de7ba | 14227 | // Index/value/traversal-order triple. |
00773463 | 14228 | |
e32de7ba | 14229 | struct IVT_triple { |
14230 | unsigned long index; | |
14231 | unsigned long traversal_order; | |
14232 | Expression* expr; | |
14233 | IVT_triple(unsigned long i, unsigned long to, Expression *e) | |
14234 | : index(i), traversal_order(to), expr(e) { } | |
14235 | bool operator<(const IVT_triple& other) const | |
14236 | { return this->index < other.index; } | |
00773463 | 14237 | }; |
14238 | ||
e440a328 | 14239 | // Lower an array composite literal. |
14240 | ||
14241 | Expression* | |
113ef6a5 | 14242 | Composite_literal_expression::lower_array(Type* type) |
e440a328 | 14243 | { |
b13c66cd | 14244 | Location location = this->location(); |
e440a328 | 14245 | if (this->vals_ == NULL || !this->has_keys_) |
ffe743ca | 14246 | return this->make_array(type, NULL, this->vals_); |
e440a328 | 14247 | |
ffe743ca | 14248 | std::vector<unsigned long>* indexes = new std::vector<unsigned long>; |
14249 | indexes->reserve(this->vals_->size()); | |
00773463 | 14250 | bool indexes_out_of_order = false; |
ffe743ca | 14251 | Expression_list* vals = new Expression_list(); |
14252 | vals->reserve(this->vals_->size()); | |
e440a328 | 14253 | unsigned long index = 0; |
14254 | Expression_list::const_iterator p = this->vals_->begin(); | |
14255 | while (p != this->vals_->end()) | |
14256 | { | |
14257 | Expression* index_expr = *p; | |
14258 | ||
14259 | ++p; | |
c484d925 | 14260 | go_assert(p != this->vals_->end()); |
e440a328 | 14261 | Expression* val = *p; |
14262 | ||
14263 | ++p; | |
14264 | ||
ffe743ca | 14265 | if (index_expr == NULL) |
14266 | { | |
8f2ebee5 | 14267 | if (std::find(indexes->begin(), indexes->end(), index) |
14268 | != indexes->end()) | |
14269 | { | |
14270 | go_error_at(val->location(), | |
14271 | "duplicate value for index %lu", index); | |
14272 | return Expression::make_error(location); | |
14273 | } | |
ffe743ca | 14274 | if (!indexes->empty()) |
14275 | indexes->push_back(index); | |
14276 | } | |
14277 | else | |
e440a328 | 14278 | { |
ffe743ca | 14279 | if (indexes->empty() && !vals->empty()) |
14280 | { | |
14281 | for (size_t i = 0; i < vals->size(); ++i) | |
14282 | indexes->push_back(i); | |
14283 | } | |
14284 | ||
0c77715b | 14285 | Numeric_constant nc; |
14286 | if (!index_expr->numeric_constant_value(&nc)) | |
e440a328 | 14287 | { |
631d5788 | 14288 | go_error_at(index_expr->location(), |
14289 | "index expression is not integer constant"); | |
e440a328 | 14290 | return Expression::make_error(location); |
14291 | } | |
6f6d9955 | 14292 | |
0c77715b | 14293 | switch (nc.to_unsigned_long(&index)) |
e440a328 | 14294 | { |
0c77715b | 14295 | case Numeric_constant::NC_UL_VALID: |
14296 | break; | |
14297 | case Numeric_constant::NC_UL_NOTINT: | |
631d5788 | 14298 | go_error_at(index_expr->location(), |
14299 | "index expression is not integer constant"); | |
0c77715b | 14300 | return Expression::make_error(location); |
14301 | case Numeric_constant::NC_UL_NEGATIVE: | |
631d5788 | 14302 | go_error_at(index_expr->location(), |
14303 | "index expression is negative"); | |
e440a328 | 14304 | return Expression::make_error(location); |
0c77715b | 14305 | case Numeric_constant::NC_UL_BIG: |
631d5788 | 14306 | go_error_at(index_expr->location(), "index value overflow"); |
e440a328 | 14307 | return Expression::make_error(location); |
0c77715b | 14308 | default: |
14309 | go_unreachable(); | |
e440a328 | 14310 | } |
6f6d9955 | 14311 | |
14312 | Named_type* ntype = Type::lookup_integer_type("int"); | |
14313 | Integer_type* inttype = ntype->integer_type(); | |
0c77715b | 14314 | if (sizeof(index) <= static_cast<size_t>(inttype->bits() * 8) |
14315 | && index >> (inttype->bits() - 1) != 0) | |
6f6d9955 | 14316 | { |
631d5788 | 14317 | go_error_at(index_expr->location(), "index value overflow"); |
6f6d9955 | 14318 | return Expression::make_error(location); |
14319 | } | |
14320 | ||
ffe743ca | 14321 | if (std::find(indexes->begin(), indexes->end(), index) |
14322 | != indexes->end()) | |
e440a328 | 14323 | { |
631d5788 | 14324 | go_error_at(index_expr->location(), |
14325 | "duplicate value for index %lu", | |
14326 | index); | |
e440a328 | 14327 | return Expression::make_error(location); |
14328 | } | |
ffe743ca | 14329 | |
00773463 | 14330 | if (!indexes->empty() && index < indexes->back()) |
14331 | indexes_out_of_order = true; | |
14332 | ||
ffe743ca | 14333 | indexes->push_back(index); |
e440a328 | 14334 | } |
14335 | ||
ffe743ca | 14336 | vals->push_back(val); |
14337 | ||
e440a328 | 14338 | ++index; |
14339 | } | |
14340 | ||
ffe743ca | 14341 | if (indexes->empty()) |
14342 | { | |
14343 | delete indexes; | |
14344 | indexes = NULL; | |
14345 | } | |
e440a328 | 14346 | |
e32de7ba | 14347 | std::vector<unsigned long>* traverse_order = NULL; |
00773463 | 14348 | if (indexes_out_of_order) |
14349 | { | |
e32de7ba | 14350 | typedef std::vector<IVT_triple> V; |
00773463 | 14351 | |
14352 | V v; | |
14353 | v.reserve(indexes->size()); | |
14354 | std::vector<unsigned long>::const_iterator pi = indexes->begin(); | |
e32de7ba | 14355 | unsigned long torder = 0; |
00773463 | 14356 | for (Expression_list::const_iterator pe = vals->begin(); |
14357 | pe != vals->end(); | |
e32de7ba | 14358 | ++pe, ++pi, ++torder) |
14359 | v.push_back(IVT_triple(*pi, torder, *pe)); | |
00773463 | 14360 | |
e32de7ba | 14361 | std::sort(v.begin(), v.end()); |
00773463 | 14362 | |
14363 | delete indexes; | |
14364 | delete vals; | |
e32de7ba | 14365 | |
00773463 | 14366 | indexes = new std::vector<unsigned long>(); |
14367 | indexes->reserve(v.size()); | |
14368 | vals = new Expression_list(); | |
14369 | vals->reserve(v.size()); | |
e32de7ba | 14370 | traverse_order = new std::vector<unsigned long>(); |
14371 | traverse_order->reserve(v.size()); | |
00773463 | 14372 | |
14373 | for (V::const_iterator p = v.begin(); p != v.end(); ++p) | |
14374 | { | |
e32de7ba | 14375 | indexes->push_back(p->index); |
14376 | vals->push_back(p->expr); | |
14377 | traverse_order->push_back(p->traversal_order); | |
00773463 | 14378 | } |
14379 | } | |
14380 | ||
e32de7ba | 14381 | Expression* ret = this->make_array(type, indexes, vals); |
14382 | Array_construction_expression* ace = ret->array_literal(); | |
14383 | if (ace != NULL && traverse_order != NULL) | |
14384 | ace->set_traverse_order(traverse_order); | |
14385 | return ret; | |
e440a328 | 14386 | } |
14387 | ||
14388 | // Actually build the array composite literal. This handles | |
14389 | // [...]{...}. | |
14390 | ||
14391 | Expression* | |
ffe743ca | 14392 | Composite_literal_expression::make_array( |
14393 | Type* type, | |
14394 | const std::vector<unsigned long>* indexes, | |
14395 | Expression_list* vals) | |
e440a328 | 14396 | { |
b13c66cd | 14397 | Location location = this->location(); |
e440a328 | 14398 | Array_type* at = type->array_type(); |
ffe743ca | 14399 | |
e440a328 | 14400 | if (at->length() != NULL && at->length()->is_nil_expression()) |
14401 | { | |
ffe743ca | 14402 | size_t size; |
14403 | if (vals == NULL) | |
14404 | size = 0; | |
00773463 | 14405 | else if (indexes != NULL) |
14406 | size = indexes->back() + 1; | |
14407 | else | |
ffe743ca | 14408 | { |
14409 | size = vals->size(); | |
14410 | Integer_type* it = Type::lookup_integer_type("int")->integer_type(); | |
14411 | if (sizeof(size) <= static_cast<size_t>(it->bits() * 8) | |
14412 | && size >> (it->bits() - 1) != 0) | |
14413 | { | |
631d5788 | 14414 | go_error_at(location, "too many elements in composite literal"); |
ffe743ca | 14415 | return Expression::make_error(location); |
14416 | } | |
14417 | } | |
ffe743ca | 14418 | |
e67508fa | 14419 | Expression* elen = Expression::make_integer_ul(size, NULL, location); |
e440a328 | 14420 | at = Type::make_array_type(at->element_type(), elen); |
14421 | type = at; | |
14422 | } | |
ffe743ca | 14423 | else if (at->length() != NULL |
14424 | && !at->length()->is_error_expression() | |
14425 | && this->vals_ != NULL) | |
14426 | { | |
14427 | Numeric_constant nc; | |
14428 | unsigned long val; | |
14429 | if (at->length()->numeric_constant_value(&nc) | |
14430 | && nc.to_unsigned_long(&val) == Numeric_constant::NC_UL_VALID) | |
14431 | { | |
14432 | if (indexes == NULL) | |
14433 | { | |
14434 | if (this->vals_->size() > val) | |
14435 | { | |
631d5788 | 14436 | go_error_at(location, |
14437 | "too many elements in composite literal"); | |
ffe743ca | 14438 | return Expression::make_error(location); |
14439 | } | |
14440 | } | |
14441 | else | |
14442 | { | |
00773463 | 14443 | unsigned long max = indexes->back(); |
ffe743ca | 14444 | if (max >= val) |
14445 | { | |
631d5788 | 14446 | go_error_at(location, |
14447 | ("some element keys in composite literal " | |
14448 | "are out of range")); | |
ffe743ca | 14449 | return Expression::make_error(location); |
14450 | } | |
14451 | } | |
14452 | } | |
14453 | } | |
14454 | ||
e440a328 | 14455 | if (at->length() != NULL) |
ffe743ca | 14456 | return new Fixed_array_construction_expression(type, indexes, vals, |
14457 | location); | |
e440a328 | 14458 | else |
2c809f8f | 14459 | return new Slice_construction_expression(type, indexes, vals, location); |
e440a328 | 14460 | } |
14461 | ||
14462 | // Lower a map composite literal. | |
14463 | ||
14464 | Expression* | |
a287720d | 14465 | Composite_literal_expression::lower_map(Gogo* gogo, Named_object* function, |
ceeb4318 | 14466 | Statement_inserter* inserter, |
a287720d | 14467 | Type* type) |
e440a328 | 14468 | { |
b13c66cd | 14469 | Location location = this->location(); |
f03a9fbf | 14470 | Unordered_map(unsigned int, std::vector<Expression*>) st; |
0ab32342 | 14471 | Unordered_map(unsigned int, std::vector<Expression*>) nt; |
e440a328 | 14472 | if (this->vals_ != NULL) |
14473 | { | |
14474 | if (!this->has_keys_) | |
14475 | { | |
631d5788 | 14476 | go_error_at(location, "map composite literal must have keys"); |
e440a328 | 14477 | return Expression::make_error(location); |
14478 | } | |
14479 | ||
a287720d | 14480 | for (Expression_list::iterator p = this->vals_->begin(); |
e440a328 | 14481 | p != this->vals_->end(); |
14482 | p += 2) | |
14483 | { | |
14484 | if (*p == NULL) | |
14485 | { | |
14486 | ++p; | |
631d5788 | 14487 | go_error_at((*p)->location(), |
14488 | ("map composite literal must " | |
14489 | "have keys for every value")); | |
e440a328 | 14490 | return Expression::make_error(location); |
14491 | } | |
a287720d | 14492 | // Make sure we have lowered the key; it may not have been |
14493 | // lowered in order to handle keys for struct composite | |
14494 | // literals. Lower it now to get the right error message. | |
14495 | if ((*p)->unknown_expression() != NULL) | |
14496 | { | |
14497 | (*p)->unknown_expression()->clear_is_composite_literal_key(); | |
ceeb4318 | 14498 | gogo->lower_expression(function, inserter, &*p); |
c484d925 | 14499 | go_assert((*p)->is_error_expression()); |
a287720d | 14500 | return Expression::make_error(location); |
14501 | } | |
f03a9fbf | 14502 | // Check if there are duplicate constant keys. |
14503 | if (!(*p)->is_constant()) | |
14504 | continue; | |
14505 | std::string sval; | |
0ab32342 | 14506 | Numeric_constant nval; |
14507 | if ((*p)->string_constant_value(&sval)) // Check string keys. | |
f03a9fbf | 14508 | { |
14509 | unsigned int h = Gogo::hash_string(sval, 0); | |
14510 | // Search the index h in the hash map. | |
14511 | Unordered_map(unsigned int, std::vector<Expression*>)::iterator mit; | |
14512 | mit = st.find(h); | |
14513 | if (mit == st.end()) | |
14514 | { | |
14515 | // No duplicate since h is a new index. | |
14516 | // Create a new vector indexed by h and add it to the hash map. | |
14517 | std::vector<Expression*> l; | |
14518 | l.push_back(*p); | |
14519 | std::pair<unsigned int, std::vector<Expression*> > val(h, l); | |
14520 | st.insert(val); | |
14521 | } | |
14522 | else | |
14523 | { | |
14524 | // Do further check since index h already exists. | |
14525 | for (std::vector<Expression*>::iterator lit = | |
14526 | mit->second.begin(); | |
14527 | lit != mit->second.end(); | |
14528 | lit++) | |
14529 | { | |
14530 | std::string s; | |
14531 | bool ok = (*lit)->string_constant_value(&s); | |
14532 | go_assert(ok); | |
14533 | if (s == sval) | |
14534 | { | |
14535 | go_error_at((*p)->location(), ("duplicate key " | |
14536 | "in map literal")); | |
14537 | return Expression::make_error(location); | |
14538 | } | |
14539 | } | |
14540 | // Add this new string key to the vector indexed by h. | |
14541 | mit->second.push_back(*p); | |
14542 | } | |
14543 | } | |
0ab32342 | 14544 | else if ((*p)->numeric_constant_value(&nval)) // Check numeric keys. |
14545 | { | |
14546 | unsigned int h = nval.hash(0); | |
14547 | Unordered_map(unsigned int, std::vector<Expression*>)::iterator mit; | |
14548 | mit = nt.find(h); | |
14549 | if (mit == nt.end()) | |
14550 | { | |
14551 | // No duplicate since h is a new code. | |
14552 | // Create a new vector indexed by h and add it to the hash map. | |
14553 | std::vector<Expression*> l; | |
14554 | l.push_back(*p); | |
14555 | std::pair<unsigned int, std::vector<Expression*> > val(h, l); | |
14556 | nt.insert(val); | |
14557 | } | |
14558 | else | |
14559 | { | |
14560 | // Do further check since h already exists. | |
14561 | for (std::vector<Expression*>::iterator lit = | |
14562 | mit->second.begin(); | |
14563 | lit != mit->second.end(); | |
14564 | lit++) | |
14565 | { | |
14566 | Numeric_constant rval; | |
14567 | bool ok = (*lit)->numeric_constant_value(&rval); | |
14568 | go_assert(ok); | |
14569 | if (nval.equals(rval)) | |
14570 | { | |
14571 | go_error_at((*p)->location(), | |
14572 | "duplicate key in map literal"); | |
14573 | return Expression::make_error(location); | |
14574 | } | |
14575 | } | |
14576 | // Add this new numeric key to the vector indexed by h. | |
14577 | mit->second.push_back(*p); | |
14578 | } | |
14579 | } | |
e440a328 | 14580 | } |
14581 | } | |
14582 | ||
14583 | return new Map_construction_expression(type, this->vals_, location); | |
14584 | } | |
14585 | ||
de590a61 | 14586 | // Copy. |
14587 | ||
14588 | Expression* | |
14589 | Composite_literal_expression::do_copy() | |
14590 | { | |
14591 | Composite_literal_expression* ret = | |
14592 | new Composite_literal_expression(this->type_->copy_expressions(), | |
14593 | this->depth_, this->has_keys_, | |
14594 | (this->vals_ == NULL | |
14595 | ? NULL | |
14596 | : this->vals_->copy()), | |
14597 | this->all_are_names_, | |
14598 | this->location()); | |
14599 | ret->key_path_ = this->key_path_; | |
14600 | return ret; | |
14601 | } | |
14602 | ||
d751bb78 | 14603 | // Dump ast representation for a composite literal expression. |
14604 | ||
14605 | void | |
14606 | Composite_literal_expression::do_dump_expression( | |
14607 | Ast_dump_context* ast_dump_context) const | |
14608 | { | |
8b1c301d | 14609 | ast_dump_context->ostream() << "composite("; |
d751bb78 | 14610 | ast_dump_context->dump_type(this->type_); |
14611 | ast_dump_context->ostream() << ", {"; | |
8b1c301d | 14612 | ast_dump_context->dump_expression_list(this->vals_, this->has_keys_); |
d751bb78 | 14613 | ast_dump_context->ostream() << "})"; |
14614 | } | |
14615 | ||
e440a328 | 14616 | // Make a composite literal expression. |
14617 | ||
14618 | Expression* | |
14619 | Expression::make_composite_literal(Type* type, int depth, bool has_keys, | |
62750cd5 | 14620 | Expression_list* vals, bool all_are_names, |
b13c66cd | 14621 | Location location) |
e440a328 | 14622 | { |
14623 | return new Composite_literal_expression(type, depth, has_keys, vals, | |
62750cd5 | 14624 | all_are_names, location); |
e440a328 | 14625 | } |
14626 | ||
14627 | // Return whether this expression is a composite literal. | |
14628 | ||
14629 | bool | |
14630 | Expression::is_composite_literal() const | |
14631 | { | |
14632 | switch (this->classification_) | |
14633 | { | |
14634 | case EXPRESSION_COMPOSITE_LITERAL: | |
14635 | case EXPRESSION_STRUCT_CONSTRUCTION: | |
14636 | case EXPRESSION_FIXED_ARRAY_CONSTRUCTION: | |
2c809f8f | 14637 | case EXPRESSION_SLICE_CONSTRUCTION: |
e440a328 | 14638 | case EXPRESSION_MAP_CONSTRUCTION: |
14639 | return true; | |
14640 | default: | |
14641 | return false; | |
14642 | } | |
14643 | } | |
14644 | ||
14645 | // Return whether this expression is a composite literal which is not | |
14646 | // constant. | |
14647 | ||
14648 | bool | |
14649 | Expression::is_nonconstant_composite_literal() const | |
14650 | { | |
14651 | switch (this->classification_) | |
14652 | { | |
14653 | case EXPRESSION_STRUCT_CONSTRUCTION: | |
14654 | { | |
14655 | const Struct_construction_expression *psce = | |
14656 | static_cast<const Struct_construction_expression*>(this); | |
14657 | return !psce->is_constant_struct(); | |
14658 | } | |
14659 | case EXPRESSION_FIXED_ARRAY_CONSTRUCTION: | |
14660 | { | |
14661 | const Fixed_array_construction_expression *pace = | |
14662 | static_cast<const Fixed_array_construction_expression*>(this); | |
14663 | return !pace->is_constant_array(); | |
14664 | } | |
2c809f8f | 14665 | case EXPRESSION_SLICE_CONSTRUCTION: |
e440a328 | 14666 | { |
2c809f8f | 14667 | const Slice_construction_expression *pace = |
14668 | static_cast<const Slice_construction_expression*>(this); | |
e440a328 | 14669 | return !pace->is_constant_array(); |
14670 | } | |
14671 | case EXPRESSION_MAP_CONSTRUCTION: | |
14672 | return true; | |
14673 | default: | |
14674 | return false; | |
14675 | } | |
14676 | } | |
14677 | ||
35a54f17 | 14678 | // Return true if this is a variable or temporary_variable. |
14679 | ||
14680 | bool | |
14681 | Expression::is_variable() const | |
14682 | { | |
14683 | switch (this->classification_) | |
14684 | { | |
14685 | case EXPRESSION_VAR_REFERENCE: | |
14686 | case EXPRESSION_TEMPORARY_REFERENCE: | |
14687 | case EXPRESSION_SET_AND_USE_TEMPORARY: | |
b0c09712 | 14688 | case EXPRESSION_ENCLOSED_VAR_REFERENCE: |
35a54f17 | 14689 | return true; |
14690 | default: | |
14691 | return false; | |
14692 | } | |
14693 | } | |
14694 | ||
e440a328 | 14695 | // Return true if this is a reference to a local variable. |
14696 | ||
14697 | bool | |
14698 | Expression::is_local_variable() const | |
14699 | { | |
14700 | const Var_expression* ve = this->var_expression(); | |
14701 | if (ve == NULL) | |
14702 | return false; | |
14703 | const Named_object* no = ve->named_object(); | |
14704 | return (no->is_result_variable() | |
14705 | || (no->is_variable() && !no->var_value()->is_global())); | |
14706 | } | |
14707 | ||
14708 | // Class Type_guard_expression. | |
14709 | ||
14710 | // Traversal. | |
14711 | ||
14712 | int | |
14713 | Type_guard_expression::do_traverse(Traverse* traverse) | |
14714 | { | |
14715 | if (Expression::traverse(&this->expr_, traverse) == TRAVERSE_EXIT | |
14716 | || Type::traverse(this->type_, traverse) == TRAVERSE_EXIT) | |
14717 | return TRAVERSE_EXIT; | |
14718 | return TRAVERSE_CONTINUE; | |
14719 | } | |
14720 | ||
2c809f8f | 14721 | Expression* |
14722 | Type_guard_expression::do_flatten(Gogo*, Named_object*, | |
14723 | Statement_inserter* inserter) | |
14724 | { | |
5bf8be8b | 14725 | if (this->expr_->is_error_expression() |
14726 | || this->expr_->type()->is_error_type()) | |
14727 | { | |
14728 | go_assert(saw_errors()); | |
14729 | return Expression::make_error(this->location()); | |
14730 | } | |
14731 | ||
2c809f8f | 14732 | if (!this->expr_->is_variable()) |
14733 | { | |
14734 | Temporary_statement* temp = Statement::make_temporary(NULL, this->expr_, | |
14735 | this->location()); | |
14736 | inserter->insert(temp); | |
14737 | this->expr_ = | |
14738 | Expression::make_temporary_reference(temp, this->location()); | |
14739 | } | |
14740 | return this; | |
14741 | } | |
14742 | ||
e440a328 | 14743 | // Check types of a type guard expression. The expression must have |
14744 | // an interface type, but the actual type conversion is checked at run | |
14745 | // time. | |
14746 | ||
14747 | void | |
14748 | Type_guard_expression::do_check_types(Gogo*) | |
14749 | { | |
e440a328 | 14750 | Type* expr_type = this->expr_->type(); |
7e9da23f | 14751 | if (expr_type->interface_type() == NULL) |
f725ade8 | 14752 | { |
5c13bd80 | 14753 | if (!expr_type->is_error() && !this->type_->is_error()) |
f725ade8 | 14754 | this->report_error(_("type assertion only valid for interface types")); |
14755 | this->set_is_error(); | |
14756 | } | |
e440a328 | 14757 | else if (this->type_->interface_type() == NULL) |
14758 | { | |
14759 | std::string reason; | |
14760 | if (!expr_type->interface_type()->implements_interface(this->type_, | |
14761 | &reason)) | |
14762 | { | |
5c13bd80 | 14763 | if (!this->type_->is_error()) |
e440a328 | 14764 | { |
f725ade8 | 14765 | if (reason.empty()) |
14766 | this->report_error(_("impossible type assertion: " | |
14767 | "type does not implement interface")); | |
14768 | else | |
631d5788 | 14769 | go_error_at(this->location(), |
14770 | ("impossible type assertion: " | |
14771 | "type does not implement interface (%s)"), | |
14772 | reason.c_str()); | |
e440a328 | 14773 | } |
f725ade8 | 14774 | this->set_is_error(); |
e440a328 | 14775 | } |
14776 | } | |
14777 | } | |
14778 | ||
de590a61 | 14779 | // Copy. |
14780 | ||
14781 | Expression* | |
14782 | Type_guard_expression::do_copy() | |
14783 | { | |
14784 | return new Type_guard_expression(this->expr_->copy(), | |
14785 | this->type_->copy_expressions(), | |
14786 | this->location()); | |
14787 | } | |
14788 | ||
ea664253 | 14789 | // Return the backend representation for a type guard expression. |
e440a328 | 14790 | |
ea664253 | 14791 | Bexpression* |
14792 | Type_guard_expression::do_get_backend(Translate_context* context) | |
e440a328 | 14793 | { |
2c809f8f | 14794 | Expression* conversion; |
7e9da23f | 14795 | if (this->type_->interface_type() != NULL) |
2c809f8f | 14796 | conversion = |
14797 | Expression::convert_interface_to_interface(this->type_, this->expr_, | |
14798 | true, this->location()); | |
e440a328 | 14799 | else |
2c809f8f | 14800 | conversion = |
14801 | Expression::convert_for_assignment(context->gogo(), this->type_, | |
14802 | this->expr_, this->location()); | |
14803 | ||
21b70e8f | 14804 | Gogo* gogo = context->gogo(); |
14805 | Btype* bt = this->type_->get_backend(gogo); | |
14806 | Bexpression* bexpr = conversion->get_backend(context); | |
14807 | return gogo->backend()->convert_expression(bt, bexpr, this->location()); | |
e440a328 | 14808 | } |
14809 | ||
d751bb78 | 14810 | // Dump ast representation for a type guard expression. |
14811 | ||
14812 | void | |
2c809f8f | 14813 | Type_guard_expression::do_dump_expression(Ast_dump_context* ast_dump_context) |
d751bb78 | 14814 | const |
14815 | { | |
14816 | this->expr_->dump_expression(ast_dump_context); | |
14817 | ast_dump_context->ostream() << "."; | |
14818 | ast_dump_context->dump_type(this->type_); | |
14819 | } | |
14820 | ||
e440a328 | 14821 | // Make a type guard expression. |
14822 | ||
14823 | Expression* | |
14824 | Expression::make_type_guard(Expression* expr, Type* type, | |
b13c66cd | 14825 | Location location) |
e440a328 | 14826 | { |
14827 | return new Type_guard_expression(expr, type, location); | |
14828 | } | |
14829 | ||
2c809f8f | 14830 | // Class Heap_expression. |
e440a328 | 14831 | |
da244e59 | 14832 | // Return the type of the expression stored on the heap. |
e440a328 | 14833 | |
da244e59 | 14834 | Type* |
14835 | Heap_expression::do_type() | |
14836 | { return Type::make_pointer_type(this->expr_->type()); } | |
e440a328 | 14837 | |
ea664253 | 14838 | // Return the backend representation for allocating an expression on the heap. |
e440a328 | 14839 | |
ea664253 | 14840 | Bexpression* |
14841 | Heap_expression::do_get_backend(Translate_context* context) | |
e440a328 | 14842 | { |
03118c21 | 14843 | Type* etype = this->expr_->type(); |
14844 | if (this->expr_->is_error_expression() || etype->is_error()) | |
ea664253 | 14845 | return context->backend()->error_expression(); |
2c809f8f | 14846 | |
02c19a1a | 14847 | Location loc = this->location(); |
2c809f8f | 14848 | Gogo* gogo = context->gogo(); |
02c19a1a | 14849 | Btype* btype = this->type()->get_backend(gogo); |
45ff893b | 14850 | |
03118c21 | 14851 | Expression* alloc = Expression::make_allocation(etype, loc); |
5973ede0 | 14852 | if (this->allocate_on_stack_) |
45ff893b | 14853 | alloc->allocation_expression()->set_allocate_on_stack(); |
14854 | Bexpression* space = alloc->get_backend(context); | |
02c19a1a | 14855 | |
14856 | Bstatement* decl; | |
14857 | Named_object* fn = context->function(); | |
14858 | go_assert(fn != NULL); | |
14859 | Bfunction* fndecl = fn->func_value()->get_or_make_decl(gogo, fn); | |
14860 | Bvariable* space_temp = | |
14861 | gogo->backend()->temporary_variable(fndecl, context->bblock(), btype, | |
14862 | space, true, loc, &decl); | |
03118c21 | 14863 | Btype* expr_btype = etype->get_backend(gogo); |
02c19a1a | 14864 | |
ea664253 | 14865 | Bexpression* bexpr = this->expr_->get_backend(context); |
03118c21 | 14866 | |
14867 | // If this assignment needs a write barrier, call typedmemmove. We | |
14868 | // don't do this in the write barrier pass because in some cases | |
14869 | // backend conversion can introduce new Heap_expression values. | |
14870 | Bstatement* assn; | |
06e83d10 | 14871 | if (!etype->has_pointer() || this->allocate_on_stack_) |
03118c21 | 14872 | { |
7af8e400 | 14873 | space = gogo->backend()->var_expression(space_temp, loc); |
03118c21 | 14874 | Bexpression* ref = |
14875 | gogo->backend()->indirect_expression(expr_btype, space, true, loc); | |
14876 | assn = gogo->backend()->assignment_statement(fndecl, ref, bexpr, loc); | |
14877 | } | |
14878 | else | |
14879 | { | |
14880 | Bstatement* edecl; | |
14881 | Bvariable* btemp = | |
14882 | gogo->backend()->temporary_variable(fndecl, context->bblock(), | |
14883 | expr_btype, bexpr, true, loc, | |
14884 | &edecl); | |
14885 | Bexpression* btempref = gogo->backend()->var_expression(btemp, | |
7af8e400 | 14886 | loc); |
03118c21 | 14887 | Bexpression* addr = gogo->backend()->address_expression(btempref, loc); |
14888 | ||
14889 | Expression* td = Expression::make_type_descriptor(etype, loc); | |
14890 | Type* etype_ptr = Type::make_pointer_type(etype); | |
7af8e400 | 14891 | space = gogo->backend()->var_expression(space_temp, loc); |
03118c21 | 14892 | Expression* elhs = Expression::make_backend(space, etype_ptr, loc); |
14893 | Expression* erhs = Expression::make_backend(addr, etype_ptr, loc); | |
14894 | Expression* call = Runtime::make_call(Runtime::TYPEDMEMMOVE, loc, 3, | |
14895 | td, elhs, erhs); | |
14896 | Bexpression* bcall = call->get_backend(context); | |
14897 | Bstatement* s = gogo->backend()->expression_statement(fndecl, bcall); | |
14898 | assn = gogo->backend()->compound_statement(edecl, s); | |
14899 | } | |
02c19a1a | 14900 | decl = gogo->backend()->compound_statement(decl, assn); |
7af8e400 | 14901 | space = gogo->backend()->var_expression(space_temp, loc); |
ea664253 | 14902 | return gogo->backend()->compound_expression(decl, space, loc); |
e440a328 | 14903 | } |
14904 | ||
2c809f8f | 14905 | // Dump ast representation for a heap expression. |
d751bb78 | 14906 | |
14907 | void | |
2c809f8f | 14908 | Heap_expression::do_dump_expression( |
d751bb78 | 14909 | Ast_dump_context* ast_dump_context) const |
14910 | { | |
14911 | ast_dump_context->ostream() << "&("; | |
14912 | ast_dump_context->dump_expression(this->expr_); | |
14913 | ast_dump_context->ostream() << ")"; | |
14914 | } | |
14915 | ||
2c809f8f | 14916 | // Allocate an expression on the heap. |
e440a328 | 14917 | |
14918 | Expression* | |
2c809f8f | 14919 | Expression::make_heap_expression(Expression* expr, Location location) |
e440a328 | 14920 | { |
2c809f8f | 14921 | return new Heap_expression(expr, location); |
e440a328 | 14922 | } |
14923 | ||
14924 | // Class Receive_expression. | |
14925 | ||
14926 | // Return the type of a receive expression. | |
14927 | ||
14928 | Type* | |
14929 | Receive_expression::do_type() | |
14930 | { | |
e429e3bd | 14931 | if (this->is_error_expression()) |
14932 | return Type::make_error_type(); | |
e440a328 | 14933 | Channel_type* channel_type = this->channel_->type()->channel_type(); |
14934 | if (channel_type == NULL) | |
e429e3bd | 14935 | { |
14936 | this->report_error(_("expected channel")); | |
14937 | return Type::make_error_type(); | |
14938 | } | |
e440a328 | 14939 | return channel_type->element_type(); |
14940 | } | |
14941 | ||
14942 | // Check types for a receive expression. | |
14943 | ||
14944 | void | |
14945 | Receive_expression::do_check_types(Gogo*) | |
14946 | { | |
14947 | Type* type = this->channel_->type(); | |
5c13bd80 | 14948 | if (type->is_error()) |
e440a328 | 14949 | { |
e429e3bd | 14950 | go_assert(saw_errors()); |
e440a328 | 14951 | this->set_is_error(); |
14952 | return; | |
14953 | } | |
14954 | if (type->channel_type() == NULL) | |
14955 | { | |
14956 | this->report_error(_("expected channel")); | |
14957 | return; | |
14958 | } | |
14959 | if (!type->channel_type()->may_receive()) | |
14960 | { | |
14961 | this->report_error(_("invalid receive on send-only channel")); | |
14962 | return; | |
14963 | } | |
14964 | } | |
14965 | ||
2c809f8f | 14966 | // Flattening for receive expressions creates a temporary variable to store |
14967 | // received data in for receives. | |
14968 | ||
14969 | Expression* | |
14970 | Receive_expression::do_flatten(Gogo*, Named_object*, | |
14971 | Statement_inserter* inserter) | |
14972 | { | |
14973 | Channel_type* channel_type = this->channel_->type()->channel_type(); | |
14974 | if (channel_type == NULL) | |
14975 | { | |
14976 | go_assert(saw_errors()); | |
14977 | return this; | |
14978 | } | |
5bf8be8b | 14979 | else if (this->channel_->is_error_expression()) |
14980 | { | |
14981 | go_assert(saw_errors()); | |
14982 | return Expression::make_error(this->location()); | |
14983 | } | |
2c809f8f | 14984 | |
14985 | Type* element_type = channel_type->element_type(); | |
14986 | if (this->temp_receiver_ == NULL) | |
14987 | { | |
14988 | this->temp_receiver_ = Statement::make_temporary(element_type, NULL, | |
14989 | this->location()); | |
14990 | this->temp_receiver_->set_is_address_taken(); | |
14991 | inserter->insert(this->temp_receiver_); | |
14992 | } | |
14993 | ||
14994 | return this; | |
14995 | } | |
14996 | ||
ea664253 | 14997 | // Get the backend representation for a receive expression. |
e440a328 | 14998 | |
ea664253 | 14999 | Bexpression* |
15000 | Receive_expression::do_get_backend(Translate_context* context) | |
e440a328 | 15001 | { |
f24f10bb | 15002 | Location loc = this->location(); |
15003 | ||
e440a328 | 15004 | Channel_type* channel_type = this->channel_->type()->channel_type(); |
5b8368f4 | 15005 | if (channel_type == NULL) |
15006 | { | |
c484d925 | 15007 | go_assert(this->channel_->type()->is_error()); |
ea664253 | 15008 | return context->backend()->error_expression(); |
5b8368f4 | 15009 | } |
e440a328 | 15010 | |
2c809f8f | 15011 | Expression* recv_ref = |
15012 | Expression::make_temporary_reference(this->temp_receiver_, loc); | |
15013 | Expression* recv_addr = | |
15014 | Expression::make_temporary_reference(this->temp_receiver_, loc); | |
15015 | recv_addr = Expression::make_unary(OPERATOR_AND, recv_addr, loc); | |
e36a5ff5 | 15016 | Expression* recv = Runtime::make_call(Runtime::CHANRECV1, loc, 2, |
15017 | this->channel_, recv_addr); | |
ea664253 | 15018 | return Expression::make_compound(recv, recv_ref, loc)->get_backend(context); |
e440a328 | 15019 | } |
15020 | ||
d751bb78 | 15021 | // Dump ast representation for a receive expression. |
15022 | ||
15023 | void | |
15024 | Receive_expression::do_dump_expression(Ast_dump_context* ast_dump_context) const | |
15025 | { | |
15026 | ast_dump_context->ostream() << " <- " ; | |
15027 | ast_dump_context->dump_expression(channel_); | |
15028 | } | |
15029 | ||
e440a328 | 15030 | // Make a receive expression. |
15031 | ||
15032 | Receive_expression* | |
b13c66cd | 15033 | Expression::make_receive(Expression* channel, Location location) |
e440a328 | 15034 | { |
15035 | return new Receive_expression(channel, location); | |
15036 | } | |
15037 | ||
e440a328 | 15038 | // An expression which evaluates to a pointer to the type descriptor |
15039 | // of a type. | |
15040 | ||
15041 | class Type_descriptor_expression : public Expression | |
15042 | { | |
15043 | public: | |
b13c66cd | 15044 | Type_descriptor_expression(Type* type, Location location) |
e440a328 | 15045 | : Expression(EXPRESSION_TYPE_DESCRIPTOR, location), |
15046 | type_(type) | |
15047 | { } | |
15048 | ||
15049 | protected: | |
4b686186 | 15050 | int |
15051 | do_traverse(Traverse*); | |
15052 | ||
e440a328 | 15053 | Type* |
15054 | do_type() | |
15055 | { return Type::make_type_descriptor_ptr_type(); } | |
15056 | ||
f9ca30f9 | 15057 | bool |
3ae06f68 | 15058 | do_is_static_initializer() const |
f9ca30f9 | 15059 | { return true; } |
15060 | ||
e440a328 | 15061 | void |
15062 | do_determine_type(const Type_context*) | |
15063 | { } | |
15064 | ||
15065 | Expression* | |
15066 | do_copy() | |
15067 | { return this; } | |
15068 | ||
ea664253 | 15069 | Bexpression* |
15070 | do_get_backend(Translate_context* context) | |
a1d23b41 | 15071 | { |
ea664253 | 15072 | return this->type_->type_descriptor_pointer(context->gogo(), |
15073 | this->location()); | |
a1d23b41 | 15074 | } |
e440a328 | 15075 | |
d751bb78 | 15076 | void |
15077 | do_dump_expression(Ast_dump_context*) const; | |
15078 | ||
e440a328 | 15079 | private: |
15080 | // The type for which this is the descriptor. | |
15081 | Type* type_; | |
15082 | }; | |
15083 | ||
4b686186 | 15084 | int |
15085 | Type_descriptor_expression::do_traverse(Traverse* traverse) | |
15086 | { | |
15087 | if (Type::traverse(this->type_, traverse) == TRAVERSE_EXIT) | |
15088 | return TRAVERSE_EXIT; | |
15089 | return TRAVERSE_CONTINUE; | |
15090 | } | |
15091 | ||
d751bb78 | 15092 | // Dump ast representation for a type descriptor expression. |
15093 | ||
15094 | void | |
15095 | Type_descriptor_expression::do_dump_expression( | |
15096 | Ast_dump_context* ast_dump_context) const | |
15097 | { | |
15098 | ast_dump_context->dump_type(this->type_); | |
15099 | } | |
15100 | ||
e440a328 | 15101 | // Make a type descriptor expression. |
15102 | ||
15103 | Expression* | |
b13c66cd | 15104 | Expression::make_type_descriptor(Type* type, Location location) |
e440a328 | 15105 | { |
15106 | return new Type_descriptor_expression(type, location); | |
15107 | } | |
15108 | ||
aa5ae575 | 15109 | // An expression which evaluates to a pointer to the Garbage Collection symbol |
15110 | // of a type. | |
15111 | ||
15112 | class GC_symbol_expression : public Expression | |
15113 | { | |
15114 | public: | |
15115 | GC_symbol_expression(Type* type) | |
15116 | : Expression(EXPRESSION_GC_SYMBOL, Linemap::predeclared_location()), | |
15117 | type_(type) | |
15118 | {} | |
15119 | ||
15120 | protected: | |
15121 | Type* | |
15122 | do_type() | |
03118c21 | 15123 | { return Type::make_pointer_type(Type::lookup_integer_type("uint8")); } |
aa5ae575 | 15124 | |
15125 | bool | |
3ae06f68 | 15126 | do_is_static_initializer() const |
aa5ae575 | 15127 | { return true; } |
15128 | ||
15129 | void | |
15130 | do_determine_type(const Type_context*) | |
15131 | { } | |
15132 | ||
15133 | Expression* | |
15134 | do_copy() | |
15135 | { return this; } | |
15136 | ||
15137 | Bexpression* | |
15138 | do_get_backend(Translate_context* context) | |
15139 | { return this->type_->gc_symbol_pointer(context->gogo()); } | |
15140 | ||
15141 | void | |
15142 | do_dump_expression(Ast_dump_context*) const; | |
15143 | ||
15144 | private: | |
15145 | // The type which this gc symbol describes. | |
15146 | Type* type_; | |
15147 | }; | |
15148 | ||
15149 | // Dump ast representation for a gc symbol expression. | |
15150 | ||
15151 | void | |
15152 | GC_symbol_expression::do_dump_expression( | |
15153 | Ast_dump_context* ast_dump_context) const | |
15154 | { | |
15155 | ast_dump_context->ostream() << "gcdata("; | |
15156 | ast_dump_context->dump_type(this->type_); | |
15157 | ast_dump_context->ostream() << ")"; | |
15158 | } | |
15159 | ||
15160 | // Make a gc symbol expression. | |
15161 | ||
15162 | Expression* | |
15163 | Expression::make_gc_symbol(Type* type) | |
15164 | { | |
15165 | return new GC_symbol_expression(type); | |
15166 | } | |
15167 | ||
03118c21 | 15168 | // An expression that evaluates to a pointer to a symbol holding the |
15169 | // ptrmask data of a type. | |
15170 | ||
15171 | class Ptrmask_symbol_expression : public Expression | |
15172 | { | |
15173 | public: | |
15174 | Ptrmask_symbol_expression(Type* type) | |
15175 | : Expression(EXPRESSION_PTRMASK_SYMBOL, Linemap::predeclared_location()), | |
15176 | type_(type) | |
15177 | {} | |
15178 | ||
15179 | protected: | |
15180 | Type* | |
15181 | do_type() | |
15182 | { return Type::make_pointer_type(Type::lookup_integer_type("uint8")); } | |
15183 | ||
15184 | bool | |
15185 | do_is_static_initializer() const | |
15186 | { return true; } | |
15187 | ||
15188 | void | |
15189 | do_determine_type(const Type_context*) | |
15190 | { } | |
15191 | ||
15192 | Expression* | |
15193 | do_copy() | |
15194 | { return this; } | |
15195 | ||
15196 | Bexpression* | |
15197 | do_get_backend(Translate_context*); | |
15198 | ||
15199 | void | |
15200 | do_dump_expression(Ast_dump_context*) const; | |
15201 | ||
15202 | private: | |
15203 | // The type that this ptrmask symbol describes. | |
15204 | Type* type_; | |
15205 | }; | |
15206 | ||
15207 | // Return the ptrmask variable. | |
15208 | ||
15209 | Bexpression* | |
15210 | Ptrmask_symbol_expression::do_get_backend(Translate_context* context) | |
15211 | { | |
15212 | Gogo* gogo = context->gogo(); | |
15213 | ||
15214 | // If this type does not need a gcprog, then we can use the standard | |
15215 | // GC symbol. | |
15216 | int64_t ptrsize, ptrdata; | |
15217 | if (!this->type_->needs_gcprog(gogo, &ptrsize, &ptrdata)) | |
15218 | return this->type_->gc_symbol_pointer(gogo); | |
15219 | ||
15220 | // Otherwise we have to build a ptrmask variable, and return a | |
15221 | // pointer to it. | |
15222 | ||
15223 | Bvariable* bvar = this->type_->gc_ptrmask_var(gogo, ptrsize, ptrdata); | |
15224 | Location bloc = Linemap::predeclared_location(); | |
7af8e400 | 15225 | Bexpression* bref = gogo->backend()->var_expression(bvar, bloc); |
03118c21 | 15226 | Bexpression* baddr = gogo->backend()->address_expression(bref, bloc); |
15227 | ||
15228 | Type* uint8_type = Type::lookup_integer_type("uint8"); | |
15229 | Type* pointer_uint8_type = Type::make_pointer_type(uint8_type); | |
15230 | Btype* ubtype = pointer_uint8_type->get_backend(gogo); | |
15231 | return gogo->backend()->convert_expression(ubtype, baddr, bloc); | |
15232 | } | |
15233 | ||
15234 | // Dump AST for a ptrmask symbol expression. | |
15235 | ||
15236 | void | |
15237 | Ptrmask_symbol_expression::do_dump_expression( | |
15238 | Ast_dump_context* ast_dump_context) const | |
15239 | { | |
15240 | ast_dump_context->ostream() << "ptrmask("; | |
15241 | ast_dump_context->dump_type(this->type_); | |
15242 | ast_dump_context->ostream() << ")"; | |
15243 | } | |
15244 | ||
15245 | // Make a ptrmask symbol expression. | |
15246 | ||
15247 | Expression* | |
15248 | Expression::make_ptrmask_symbol(Type* type) | |
15249 | { | |
15250 | return new Ptrmask_symbol_expression(type); | |
15251 | } | |
15252 | ||
e440a328 | 15253 | // An expression which evaluates to some characteristic of a type. |
15254 | // This is only used to initialize fields of a type descriptor. Using | |
15255 | // a new expression class is slightly inefficient but gives us a good | |
15256 | // separation between the frontend and the middle-end with regard to | |
15257 | // how types are laid out. | |
15258 | ||
15259 | class Type_info_expression : public Expression | |
15260 | { | |
15261 | public: | |
15262 | Type_info_expression(Type* type, Type_info type_info) | |
b13c66cd | 15263 | : Expression(EXPRESSION_TYPE_INFO, Linemap::predeclared_location()), |
e440a328 | 15264 | type_(type), type_info_(type_info) |
15265 | { } | |
15266 | ||
15267 | protected: | |
0e168074 | 15268 | bool |
3ae06f68 | 15269 | do_is_static_initializer() const |
0e168074 | 15270 | { return true; } |
15271 | ||
e440a328 | 15272 | Type* |
15273 | do_type(); | |
15274 | ||
15275 | void | |
15276 | do_determine_type(const Type_context*) | |
15277 | { } | |
15278 | ||
15279 | Expression* | |
15280 | do_copy() | |
15281 | { return this; } | |
15282 | ||
ea664253 | 15283 | Bexpression* |
15284 | do_get_backend(Translate_context* context); | |
e440a328 | 15285 | |
d751bb78 | 15286 | void |
15287 | do_dump_expression(Ast_dump_context*) const; | |
15288 | ||
e440a328 | 15289 | private: |
15290 | // The type for which we are getting information. | |
15291 | Type* type_; | |
15292 | // What information we want. | |
15293 | Type_info type_info_; | |
15294 | }; | |
15295 | ||
15296 | // The type is chosen to match what the type descriptor struct | |
15297 | // expects. | |
15298 | ||
15299 | Type* | |
15300 | Type_info_expression::do_type() | |
15301 | { | |
15302 | switch (this->type_info_) | |
15303 | { | |
15304 | case TYPE_INFO_SIZE: | |
03118c21 | 15305 | case TYPE_INFO_BACKEND_PTRDATA: |
15306 | case TYPE_INFO_DESCRIPTOR_PTRDATA: | |
e440a328 | 15307 | return Type::lookup_integer_type("uintptr"); |
15308 | case TYPE_INFO_ALIGNMENT: | |
15309 | case TYPE_INFO_FIELD_ALIGNMENT: | |
15310 | return Type::lookup_integer_type("uint8"); | |
15311 | default: | |
c3e6f413 | 15312 | go_unreachable(); |
e440a328 | 15313 | } |
15314 | } | |
15315 | ||
ea664253 | 15316 | // Return the backend representation for type information. |
e440a328 | 15317 | |
ea664253 | 15318 | Bexpression* |
15319 | Type_info_expression::do_get_backend(Translate_context* context) | |
e440a328 | 15320 | { |
927a01eb | 15321 | Gogo* gogo = context->gogo(); |
2a305b85 | 15322 | bool ok = true; |
3f378015 | 15323 | int64_t val; |
927a01eb | 15324 | switch (this->type_info_) |
e440a328 | 15325 | { |
927a01eb | 15326 | case TYPE_INFO_SIZE: |
2a305b85 | 15327 | ok = this->type_->backend_type_size(gogo, &val); |
927a01eb | 15328 | break; |
15329 | case TYPE_INFO_ALIGNMENT: | |
2a305b85 | 15330 | ok = this->type_->backend_type_align(gogo, &val); |
927a01eb | 15331 | break; |
15332 | case TYPE_INFO_FIELD_ALIGNMENT: | |
2a305b85 | 15333 | ok = this->type_->backend_type_field_align(gogo, &val); |
927a01eb | 15334 | break; |
03118c21 | 15335 | case TYPE_INFO_BACKEND_PTRDATA: |
15336 | ok = this->type_->backend_type_ptrdata(gogo, &val); | |
15337 | break; | |
15338 | case TYPE_INFO_DESCRIPTOR_PTRDATA: | |
15339 | ok = this->type_->descriptor_ptrdata(gogo, &val); | |
15340 | break; | |
927a01eb | 15341 | default: |
15342 | go_unreachable(); | |
e440a328 | 15343 | } |
2a305b85 | 15344 | if (!ok) |
15345 | { | |
15346 | go_assert(saw_errors()); | |
15347 | return gogo->backend()->error_expression(); | |
15348 | } | |
3f378015 | 15349 | Expression* e = Expression::make_integer_int64(val, this->type(), |
15350 | this->location()); | |
15351 | return e->get_backend(context); | |
e440a328 | 15352 | } |
15353 | ||
d751bb78 | 15354 | // Dump ast representation for a type info expression. |
15355 | ||
15356 | void | |
15357 | Type_info_expression::do_dump_expression( | |
15358 | Ast_dump_context* ast_dump_context) const | |
15359 | { | |
15360 | ast_dump_context->ostream() << "typeinfo("; | |
15361 | ast_dump_context->dump_type(this->type_); | |
15362 | ast_dump_context->ostream() << ","; | |
f03a9fbf | 15363 | ast_dump_context->ostream() << |
15364 | (this->type_info_ == TYPE_INFO_ALIGNMENT ? "alignment" | |
d751bb78 | 15365 | : this->type_info_ == TYPE_INFO_FIELD_ALIGNMENT ? "field alignment" |
03118c21 | 15366 | : this->type_info_ == TYPE_INFO_SIZE ? "size" |
15367 | : this->type_info_ == TYPE_INFO_BACKEND_PTRDATA ? "backend_ptrdata" | |
15368 | : this->type_info_ == TYPE_INFO_DESCRIPTOR_PTRDATA ? "descriptor_ptrdata" | |
d751bb78 | 15369 | : "unknown"); |
15370 | ast_dump_context->ostream() << ")"; | |
15371 | } | |
15372 | ||
e440a328 | 15373 | // Make a type info expression. |
15374 | ||
15375 | Expression* | |
15376 | Expression::make_type_info(Type* type, Type_info type_info) | |
15377 | { | |
15378 | return new Type_info_expression(type, type_info); | |
15379 | } | |
15380 | ||
35a54f17 | 15381 | // An expression that evaluates to some characteristic of a slice. |
15382 | // This is used when indexing, bound-checking, or nil checking a slice. | |
15383 | ||
15384 | class Slice_info_expression : public Expression | |
15385 | { | |
15386 | public: | |
15387 | Slice_info_expression(Expression* slice, Slice_info slice_info, | |
15388 | Location location) | |
15389 | : Expression(EXPRESSION_SLICE_INFO, location), | |
15390 | slice_(slice), slice_info_(slice_info) | |
15391 | { } | |
15392 | ||
15393 | protected: | |
15394 | Type* | |
15395 | do_type(); | |
15396 | ||
15397 | void | |
15398 | do_determine_type(const Type_context*) | |
15399 | { } | |
15400 | ||
15401 | Expression* | |
15402 | do_copy() | |
15403 | { | |
15404 | return new Slice_info_expression(this->slice_->copy(), this->slice_info_, | |
15405 | this->location()); | |
15406 | } | |
15407 | ||
ea664253 | 15408 | Bexpression* |
15409 | do_get_backend(Translate_context* context); | |
35a54f17 | 15410 | |
15411 | void | |
15412 | do_dump_expression(Ast_dump_context*) const; | |
15413 | ||
15414 | void | |
15415 | do_issue_nil_check() | |
15416 | { this->slice_->issue_nil_check(); } | |
15417 | ||
15418 | private: | |
15419 | // The slice for which we are getting information. | |
15420 | Expression* slice_; | |
15421 | // What information we want. | |
15422 | Slice_info slice_info_; | |
15423 | }; | |
15424 | ||
15425 | // Return the type of the slice info. | |
15426 | ||
15427 | Type* | |
15428 | Slice_info_expression::do_type() | |
15429 | { | |
15430 | switch (this->slice_info_) | |
15431 | { | |
15432 | case SLICE_INFO_VALUE_POINTER: | |
15433 | return Type::make_pointer_type( | |
15434 | this->slice_->type()->array_type()->element_type()); | |
15435 | case SLICE_INFO_LENGTH: | |
15436 | case SLICE_INFO_CAPACITY: | |
15437 | return Type::lookup_integer_type("int"); | |
15438 | default: | |
15439 | go_unreachable(); | |
15440 | } | |
15441 | } | |
15442 | ||
ea664253 | 15443 | // Return the backend information for slice information. |
35a54f17 | 15444 | |
ea664253 | 15445 | Bexpression* |
15446 | Slice_info_expression::do_get_backend(Translate_context* context) | |
35a54f17 | 15447 | { |
15448 | Gogo* gogo = context->gogo(); | |
ea664253 | 15449 | Bexpression* bslice = this->slice_->get_backend(context); |
35a54f17 | 15450 | switch (this->slice_info_) |
15451 | { | |
15452 | case SLICE_INFO_VALUE_POINTER: | |
15453 | case SLICE_INFO_LENGTH: | |
15454 | case SLICE_INFO_CAPACITY: | |
ea664253 | 15455 | return gogo->backend()->struct_field_expression(bslice, this->slice_info_, |
15456 | this->location()); | |
35a54f17 | 15457 | break; |
15458 | default: | |
15459 | go_unreachable(); | |
15460 | } | |
35a54f17 | 15461 | } |
15462 | ||
15463 | // Dump ast representation for a type info expression. | |
15464 | ||
15465 | void | |
15466 | Slice_info_expression::do_dump_expression( | |
15467 | Ast_dump_context* ast_dump_context) const | |
15468 | { | |
15469 | ast_dump_context->ostream() << "sliceinfo("; | |
15470 | this->slice_->dump_expression(ast_dump_context); | |
15471 | ast_dump_context->ostream() << ","; | |
f03a9fbf | 15472 | ast_dump_context->ostream() << |
15473 | (this->slice_info_ == SLICE_INFO_VALUE_POINTER ? "values" | |
35a54f17 | 15474 | : this->slice_info_ == SLICE_INFO_LENGTH ? "length" |
15475 | : this->slice_info_ == SLICE_INFO_CAPACITY ? "capacity " | |
15476 | : "unknown"); | |
15477 | ast_dump_context->ostream() << ")"; | |
15478 | } | |
15479 | ||
15480 | // Make a slice info expression. | |
15481 | ||
15482 | Expression* | |
15483 | Expression::make_slice_info(Expression* slice, Slice_info slice_info, | |
15484 | Location location) | |
15485 | { | |
15486 | return new Slice_info_expression(slice, slice_info, location); | |
15487 | } | |
15488 | ||
d633d0fb | 15489 | // Class Slice_value_expression. |
2c809f8f | 15490 | |
15491 | int | |
15492 | Slice_value_expression::do_traverse(Traverse* traverse) | |
15493 | { | |
55e8ba6a | 15494 | if (Type::traverse(this->type_, traverse) == TRAVERSE_EXIT |
d633d0fb | 15495 | || Expression::traverse(&this->valmem_, traverse) == TRAVERSE_EXIT |
2c809f8f | 15496 | || Expression::traverse(&this->len_, traverse) == TRAVERSE_EXIT |
15497 | || Expression::traverse(&this->cap_, traverse) == TRAVERSE_EXIT) | |
15498 | return TRAVERSE_EXIT; | |
15499 | return TRAVERSE_CONTINUE; | |
15500 | } | |
15501 | ||
d633d0fb | 15502 | Expression* |
15503 | Slice_value_expression::do_copy() | |
15504 | { | |
15505 | return new Slice_value_expression(this->type_->copy_expressions(), | |
15506 | this->valmem_->copy(), | |
15507 | this->len_->copy(), this->cap_->copy(), | |
15508 | this->location()); | |
15509 | } | |
15510 | ||
ea664253 | 15511 | Bexpression* |
15512 | Slice_value_expression::do_get_backend(Translate_context* context) | |
2c809f8f | 15513 | { |
15514 | std::vector<Bexpression*> vals(3); | |
d633d0fb | 15515 | vals[0] = this->valmem_->get_backend(context); |
ea664253 | 15516 | vals[1] = this->len_->get_backend(context); |
15517 | vals[2] = this->cap_->get_backend(context); | |
2c809f8f | 15518 | |
15519 | Gogo* gogo = context->gogo(); | |
15520 | Btype* btype = this->type_->get_backend(gogo); | |
ea664253 | 15521 | return gogo->backend()->constructor_expression(btype, vals, this->location()); |
2c809f8f | 15522 | } |
15523 | ||
15524 | void | |
15525 | Slice_value_expression::do_dump_expression( | |
15526 | Ast_dump_context* ast_dump_context) const | |
15527 | { | |
15528 | ast_dump_context->ostream() << "slicevalue("; | |
15529 | ast_dump_context->ostream() << "values: "; | |
d633d0fb | 15530 | this->valmem_->dump_expression(ast_dump_context); |
2c809f8f | 15531 | ast_dump_context->ostream() << ", length: "; |
15532 | this->len_->dump_expression(ast_dump_context); | |
15533 | ast_dump_context->ostream() << ", capacity: "; | |
15534 | this->cap_->dump_expression(ast_dump_context); | |
15535 | ast_dump_context->ostream() << ")"; | |
15536 | } | |
15537 | ||
15538 | Expression* | |
d633d0fb | 15539 | Expression::make_slice_value(Type* at, Expression* valmem, Expression* len, |
2c809f8f | 15540 | Expression* cap, Location location) |
15541 | { | |
15542 | go_assert(at->is_slice_type()); | |
d633d0fb | 15543 | go_assert(valmem->is_nil_expression() |
15544 | || (at->array_type()->element_type() | |
15545 | == valmem->type()->points_to())); | |
15546 | return new Slice_value_expression(at, valmem, len, cap, location); | |
2c809f8f | 15547 | } |
2387f644 | 15548 | |
15549 | // An expression that evaluates to some characteristic of a non-empty interface. | |
15550 | // This is used to access the method table or underlying object of an interface. | |
15551 | ||
15552 | class Interface_info_expression : public Expression | |
15553 | { | |
15554 | public: | |
15555 | Interface_info_expression(Expression* iface, Interface_info iface_info, | |
2c809f8f | 15556 | Location location) |
2387f644 | 15557 | : Expression(EXPRESSION_INTERFACE_INFO, location), |
15558 | iface_(iface), iface_info_(iface_info) | |
15559 | { } | |
15560 | ||
15561 | protected: | |
15562 | Type* | |
15563 | do_type(); | |
15564 | ||
15565 | void | |
15566 | do_determine_type(const Type_context*) | |
15567 | { } | |
15568 | ||
15569 | Expression* | |
15570 | do_copy() | |
15571 | { | |
15572 | return new Interface_info_expression(this->iface_->copy(), | |
15573 | this->iface_info_, this->location()); | |
15574 | } | |
15575 | ||
ea664253 | 15576 | Bexpression* |
15577 | do_get_backend(Translate_context* context); | |
2387f644 | 15578 | |
15579 | void | |
15580 | do_dump_expression(Ast_dump_context*) const; | |
15581 | ||
15582 | void | |
15583 | do_issue_nil_check() | |
15584 | { this->iface_->issue_nil_check(); } | |
15585 | ||
15586 | private: | |
15587 | // The interface for which we are getting information. | |
15588 | Expression* iface_; | |
15589 | // What information we want. | |
15590 | Interface_info iface_info_; | |
15591 | }; | |
15592 | ||
15593 | // Return the type of the interface info. | |
15594 | ||
15595 | Type* | |
15596 | Interface_info_expression::do_type() | |
15597 | { | |
15598 | switch (this->iface_info_) | |
15599 | { | |
15600 | case INTERFACE_INFO_METHODS: | |
15601 | { | |
625d3118 | 15602 | typedef Unordered_map(Interface_type*, Type*) Hashtable; |
15603 | static Hashtable result_types; | |
15604 | ||
15605 | Interface_type* itype = this->iface_->type()->interface_type(); | |
15606 | ||
15607 | Hashtable::const_iterator p = result_types.find(itype); | |
15608 | if (p != result_types.end()) | |
15609 | return p->second; | |
15610 | ||
2c809f8f | 15611 | Type* pdt = Type::make_type_descriptor_ptr_type(); |
625d3118 | 15612 | if (itype->is_empty()) |
15613 | { | |
15614 | result_types[itype] = pdt; | |
15615 | return pdt; | |
15616 | } | |
2c809f8f | 15617 | |
2387f644 | 15618 | Location loc = this->location(); |
15619 | Struct_field_list* sfl = new Struct_field_list(); | |
2387f644 | 15620 | sfl->push_back( |
15621 | Struct_field(Typed_identifier("__type_descriptor", pdt, loc))); | |
15622 | ||
2387f644 | 15623 | for (Typed_identifier_list::const_iterator p = itype->methods()->begin(); |
15624 | p != itype->methods()->end(); | |
15625 | ++p) | |
15626 | { | |
15627 | Function_type* ft = p->type()->function_type(); | |
15628 | go_assert(ft->receiver() == NULL); | |
15629 | ||
15630 | const Typed_identifier_list* params = ft->parameters(); | |
15631 | Typed_identifier_list* mparams = new Typed_identifier_list(); | |
15632 | if (params != NULL) | |
15633 | mparams->reserve(params->size() + 1); | |
15634 | Type* vt = Type::make_pointer_type(Type::make_void_type()); | |
15635 | mparams->push_back(Typed_identifier("", vt, ft->location())); | |
15636 | if (params != NULL) | |
15637 | { | |
15638 | for (Typed_identifier_list::const_iterator pp = params->begin(); | |
15639 | pp != params->end(); | |
15640 | ++pp) | |
15641 | mparams->push_back(*pp); | |
15642 | } | |
15643 | ||
15644 | Typed_identifier_list* mresults = (ft->results() == NULL | |
15645 | ? NULL | |
15646 | : ft->results()->copy()); | |
15647 | Backend_function_type* mft = | |
15648 | Type::make_backend_function_type(NULL, mparams, mresults, | |
15649 | ft->location()); | |
15650 | ||
15651 | std::string fname = Gogo::unpack_hidden_name(p->name()); | |
15652 | sfl->push_back(Struct_field(Typed_identifier(fname, mft, loc))); | |
15653 | } | |
15654 | ||
6bf4793c | 15655 | Struct_type* st = Type::make_struct_type(sfl, loc); |
15656 | st->set_is_struct_incomparable(); | |
15657 | Pointer_type *pt = Type::make_pointer_type(st); | |
625d3118 | 15658 | result_types[itype] = pt; |
15659 | return pt; | |
2387f644 | 15660 | } |
15661 | case INTERFACE_INFO_OBJECT: | |
15662 | return Type::make_pointer_type(Type::make_void_type()); | |
15663 | default: | |
15664 | go_unreachable(); | |
15665 | } | |
15666 | } | |
15667 | ||
ea664253 | 15668 | // Return the backend representation for interface information. |
2387f644 | 15669 | |
ea664253 | 15670 | Bexpression* |
15671 | Interface_info_expression::do_get_backend(Translate_context* context) | |
2387f644 | 15672 | { |
15673 | Gogo* gogo = context->gogo(); | |
ea664253 | 15674 | Bexpression* biface = this->iface_->get_backend(context); |
2387f644 | 15675 | switch (this->iface_info_) |
15676 | { | |
15677 | case INTERFACE_INFO_METHODS: | |
15678 | case INTERFACE_INFO_OBJECT: | |
ea664253 | 15679 | return gogo->backend()->struct_field_expression(biface, this->iface_info_, |
15680 | this->location()); | |
2387f644 | 15681 | break; |
15682 | default: | |
15683 | go_unreachable(); | |
15684 | } | |
2387f644 | 15685 | } |
15686 | ||
15687 | // Dump ast representation for an interface info expression. | |
15688 | ||
15689 | void | |
15690 | Interface_info_expression::do_dump_expression( | |
15691 | Ast_dump_context* ast_dump_context) const | |
15692 | { | |
2c809f8f | 15693 | bool is_empty = this->iface_->type()->interface_type()->is_empty(); |
2387f644 | 15694 | ast_dump_context->ostream() << "interfaceinfo("; |
15695 | this->iface_->dump_expression(ast_dump_context); | |
15696 | ast_dump_context->ostream() << ","; | |
15697 | ast_dump_context->ostream() << | |
2c809f8f | 15698 | (this->iface_info_ == INTERFACE_INFO_METHODS && !is_empty ? "methods" |
15699 | : this->iface_info_ == INTERFACE_INFO_TYPE_DESCRIPTOR ? "type_descriptor" | |
2387f644 | 15700 | : this->iface_info_ == INTERFACE_INFO_OBJECT ? "object" |
15701 | : "unknown"); | |
15702 | ast_dump_context->ostream() << ")"; | |
15703 | } | |
15704 | ||
15705 | // Make an interface info expression. | |
15706 | ||
15707 | Expression* | |
15708 | Expression::make_interface_info(Expression* iface, Interface_info iface_info, | |
15709 | Location location) | |
15710 | { | |
15711 | return new Interface_info_expression(iface, iface_info, location); | |
15712 | } | |
15713 | ||
2c809f8f | 15714 | // An expression that represents an interface value. The first field is either |
15715 | // a type descriptor for an empty interface or a pointer to the interface method | |
15716 | // table for a non-empty interface. The second field is always the object. | |
15717 | ||
15718 | class Interface_value_expression : public Expression | |
15719 | { | |
15720 | public: | |
15721 | Interface_value_expression(Type* type, Expression* first_field, | |
15722 | Expression* obj, Location location) | |
15723 | : Expression(EXPRESSION_INTERFACE_VALUE, location), | |
15724 | type_(type), first_field_(first_field), obj_(obj) | |
15725 | { } | |
15726 | ||
15727 | protected: | |
15728 | int | |
15729 | do_traverse(Traverse*); | |
15730 | ||
15731 | Type* | |
15732 | do_type() | |
15733 | { return this->type_; } | |
15734 | ||
15735 | void | |
15736 | do_determine_type(const Type_context*) | |
15737 | { go_unreachable(); } | |
15738 | ||
15739 | Expression* | |
15740 | do_copy() | |
15741 | { | |
de590a61 | 15742 | return new Interface_value_expression(this->type_->copy_expressions(), |
2c809f8f | 15743 | this->first_field_->copy(), |
15744 | this->obj_->copy(), this->location()); | |
15745 | } | |
15746 | ||
ea664253 | 15747 | Bexpression* |
15748 | do_get_backend(Translate_context* context); | |
2c809f8f | 15749 | |
15750 | void | |
15751 | do_dump_expression(Ast_dump_context*) const; | |
15752 | ||
15753 | private: | |
15754 | // The type of the interface value. | |
15755 | Type* type_; | |
15756 | // The first field of the interface (either a type descriptor or a pointer | |
15757 | // to the method table. | |
15758 | Expression* first_field_; | |
15759 | // The underlying object of the interface. | |
15760 | Expression* obj_; | |
15761 | }; | |
15762 | ||
15763 | int | |
15764 | Interface_value_expression::do_traverse(Traverse* traverse) | |
15765 | { | |
15766 | if (Expression::traverse(&this->first_field_, traverse) == TRAVERSE_EXIT | |
15767 | || Expression::traverse(&this->obj_, traverse) == TRAVERSE_EXIT) | |
15768 | return TRAVERSE_EXIT; | |
15769 | return TRAVERSE_CONTINUE; | |
15770 | } | |
15771 | ||
ea664253 | 15772 | Bexpression* |
15773 | Interface_value_expression::do_get_backend(Translate_context* context) | |
2c809f8f | 15774 | { |
15775 | std::vector<Bexpression*> vals(2); | |
ea664253 | 15776 | vals[0] = this->first_field_->get_backend(context); |
15777 | vals[1] = this->obj_->get_backend(context); | |
2c809f8f | 15778 | |
15779 | Gogo* gogo = context->gogo(); | |
15780 | Btype* btype = this->type_->get_backend(gogo); | |
ea664253 | 15781 | return gogo->backend()->constructor_expression(btype, vals, this->location()); |
2c809f8f | 15782 | } |
15783 | ||
15784 | void | |
15785 | Interface_value_expression::do_dump_expression( | |
15786 | Ast_dump_context* ast_dump_context) const | |
15787 | { | |
15788 | ast_dump_context->ostream() << "interfacevalue("; | |
15789 | ast_dump_context->ostream() << | |
15790 | (this->type_->interface_type()->is_empty() | |
15791 | ? "type_descriptor: " | |
15792 | : "methods: "); | |
15793 | this->first_field_->dump_expression(ast_dump_context); | |
15794 | ast_dump_context->ostream() << ", object: "; | |
15795 | this->obj_->dump_expression(ast_dump_context); | |
15796 | ast_dump_context->ostream() << ")"; | |
15797 | } | |
15798 | ||
15799 | Expression* | |
15800 | Expression::make_interface_value(Type* type, Expression* first_value, | |
15801 | Expression* object, Location location) | |
15802 | { | |
15803 | return new Interface_value_expression(type, first_value, object, location); | |
15804 | } | |
15805 | ||
15806 | // An interface method table for a pair of types: an interface type and a type | |
15807 | // that implements that interface. | |
15808 | ||
15809 | class Interface_mtable_expression : public Expression | |
15810 | { | |
15811 | public: | |
15812 | Interface_mtable_expression(Interface_type* itype, Type* type, | |
15813 | bool is_pointer, Location location) | |
15814 | : Expression(EXPRESSION_INTERFACE_MTABLE, location), | |
15815 | itype_(itype), type_(type), is_pointer_(is_pointer), | |
15816 | method_table_type_(NULL), bvar_(NULL) | |
15817 | { } | |
15818 | ||
15819 | protected: | |
15820 | int | |
15821 | do_traverse(Traverse*); | |
15822 | ||
15823 | Type* | |
15824 | do_type(); | |
15825 | ||
15826 | bool | |
3ae06f68 | 15827 | do_is_static_initializer() const |
2c809f8f | 15828 | { return true; } |
15829 | ||
15830 | void | |
15831 | do_determine_type(const Type_context*) | |
15832 | { go_unreachable(); } | |
15833 | ||
15834 | Expression* | |
15835 | do_copy() | |
15836 | { | |
de590a61 | 15837 | Interface_type* itype = this->itype_->copy_expressions()->interface_type(); |
15838 | return new Interface_mtable_expression(itype, | |
15839 | this->type_->copy_expressions(), | |
2c809f8f | 15840 | this->is_pointer_, this->location()); |
15841 | } | |
15842 | ||
15843 | bool | |
15844 | do_is_addressable() const | |
15845 | { return true; } | |
15846 | ||
ea664253 | 15847 | Bexpression* |
15848 | do_get_backend(Translate_context* context); | |
2c809f8f | 15849 | |
15850 | void | |
15851 | do_dump_expression(Ast_dump_context*) const; | |
15852 | ||
15853 | private: | |
15854 | // The interface type for which the methods are defined. | |
15855 | Interface_type* itype_; | |
15856 | // The type to construct the interface method table for. | |
15857 | Type* type_; | |
15858 | // Whether this table contains the method set for the receiver type or the | |
15859 | // pointer receiver type. | |
15860 | bool is_pointer_; | |
15861 | // The type of the method table. | |
15862 | Type* method_table_type_; | |
15863 | // The backend variable that refers to the interface method table. | |
15864 | Bvariable* bvar_; | |
15865 | }; | |
15866 | ||
15867 | int | |
15868 | Interface_mtable_expression::do_traverse(Traverse* traverse) | |
15869 | { | |
15870 | if (Type::traverse(this->itype_, traverse) == TRAVERSE_EXIT | |
15871 | || Type::traverse(this->type_, traverse) == TRAVERSE_EXIT) | |
15872 | return TRAVERSE_EXIT; | |
15873 | return TRAVERSE_CONTINUE; | |
15874 | } | |
15875 | ||
15876 | Type* | |
15877 | Interface_mtable_expression::do_type() | |
15878 | { | |
15879 | if (this->method_table_type_ != NULL) | |
15880 | return this->method_table_type_; | |
15881 | ||
15882 | const Typed_identifier_list* interface_methods = this->itype_->methods(); | |
15883 | go_assert(!interface_methods->empty()); | |
15884 | ||
15885 | Struct_field_list* sfl = new Struct_field_list; | |
15886 | Typed_identifier tid("__type_descriptor", Type::make_type_descriptor_ptr_type(), | |
15887 | this->location()); | |
15888 | sfl->push_back(Struct_field(tid)); | |
db122cb9 | 15889 | Type* unsafe_ptr_type = Type::make_pointer_type(Type::make_void_type()); |
2c809f8f | 15890 | for (Typed_identifier_list::const_iterator p = interface_methods->begin(); |
15891 | p != interface_methods->end(); | |
15892 | ++p) | |
db122cb9 | 15893 | { |
15894 | // We want C function pointers here, not func descriptors; model | |
15895 | // using void* pointers. | |
15896 | Typed_identifier method(p->name(), unsafe_ptr_type, p->location()); | |
15897 | sfl->push_back(Struct_field(method)); | |
15898 | } | |
6bf4793c | 15899 | Struct_type* st = Type::make_struct_type(sfl, this->location()); |
15900 | st->set_is_struct_incomparable(); | |
15901 | this->method_table_type_ = st; | |
2c809f8f | 15902 | return this->method_table_type_; |
15903 | } | |
15904 | ||
ea664253 | 15905 | Bexpression* |
15906 | Interface_mtable_expression::do_get_backend(Translate_context* context) | |
2c809f8f | 15907 | { |
15908 | Gogo* gogo = context->gogo(); | |
2c809f8f | 15909 | Location loc = Linemap::predeclared_location(); |
15910 | if (this->bvar_ != NULL) | |
7af8e400 | 15911 | return gogo->backend()->var_expression(this->bvar_, this->location()); |
2c809f8f | 15912 | |
15913 | const Typed_identifier_list* interface_methods = this->itype_->methods(); | |
15914 | go_assert(!interface_methods->empty()); | |
15915 | ||
19272321 | 15916 | std::string mangled_name = |
15917 | gogo->interface_method_table_name(this->itype_, this->type_, | |
15918 | this->is_pointer_); | |
2c809f8f | 15919 | |
1530c754 | 15920 | // Set is_public if we are converting a named type to an interface |
15921 | // type that is defined in the same package as the named type, and | |
15922 | // the interface has hidden methods. In that case the interface | |
15923 | // method table will be defined by the package that defines the | |
15924 | // types. | |
15925 | bool is_public = false; | |
15926 | if (this->type_->named_type() != NULL | |
15927 | && (this->type_->named_type()->named_object()->package() | |
15928 | == this->itype_->package())) | |
15929 | { | |
15930 | for (Typed_identifier_list::const_iterator p = interface_methods->begin(); | |
15931 | p != interface_methods->end(); | |
15932 | ++p) | |
2c809f8f | 15933 | { |
1530c754 | 15934 | if (Gogo::is_hidden_name(p->name())) |
15935 | { | |
15936 | is_public = true; | |
15937 | break; | |
15938 | } | |
2c809f8f | 15939 | } |
15940 | } | |
15941 | ||
1530c754 | 15942 | if (is_public |
2c809f8f | 15943 | && this->type_->named_type()->named_object()->package() != NULL) |
15944 | { | |
1530c754 | 15945 | // The interface conversion table is defined elsewhere. |
2c809f8f | 15946 | Btype* btype = this->type()->get_backend(gogo); |
438b4bec | 15947 | std::string asm_name(go_selectively_encode_id(mangled_name)); |
2c809f8f | 15948 | this->bvar_ = |
438b4bec | 15949 | gogo->backend()->immutable_struct_reference(mangled_name, asm_name, |
15950 | btype, loc); | |
7af8e400 | 15951 | return gogo->backend()->var_expression(this->bvar_, this->location()); |
2c809f8f | 15952 | } |
15953 | ||
15954 | // The first element is the type descriptor. | |
15955 | Type* td_type; | |
15956 | if (!this->is_pointer_) | |
15957 | td_type = this->type_; | |
15958 | else | |
15959 | td_type = Type::make_pointer_type(this->type_); | |
15960 | ||
db122cb9 | 15961 | std::vector<Backend::Btyped_identifier> bstructfields; |
15962 | ||
2c809f8f | 15963 | // Build an interface method table for a type: a type descriptor followed by a |
15964 | // list of function pointers, one for each interface method. This is used for | |
15965 | // interfaces. | |
15966 | Expression_list* svals = new Expression_list(); | |
db122cb9 | 15967 | Expression* tdescriptor = Expression::make_type_descriptor(td_type, loc); |
15968 | svals->push_back(tdescriptor); | |
15969 | ||
15970 | Btype* tdesc_btype = tdescriptor->type()->get_backend(gogo); | |
15971 | Backend::Btyped_identifier btd("_type", tdesc_btype, loc); | |
15972 | bstructfields.push_back(btd); | |
2c809f8f | 15973 | |
15974 | Named_type* nt = this->type_->named_type(); | |
15975 | Struct_type* st = this->type_->struct_type(); | |
15976 | go_assert(nt != NULL || st != NULL); | |
15977 | ||
15978 | for (Typed_identifier_list::const_iterator p = interface_methods->begin(); | |
15979 | p != interface_methods->end(); | |
15980 | ++p) | |
15981 | { | |
15982 | bool is_ambiguous; | |
15983 | Method* m; | |
15984 | if (nt != NULL) | |
15985 | m = nt->method_function(p->name(), &is_ambiguous); | |
15986 | else | |
15987 | m = st->method_function(p->name(), &is_ambiguous); | |
15988 | go_assert(m != NULL); | |
15989 | Named_object* no = m->named_object(); | |
15990 | ||
15991 | go_assert(no->is_function() || no->is_function_declaration()); | |
db122cb9 | 15992 | |
15993 | Btype* fcn_btype = m->type()->get_backend_fntype(gogo); | |
15994 | Backend::Btyped_identifier bmtype(p->name(), fcn_btype, loc); | |
15995 | bstructfields.push_back(bmtype); | |
15996 | ||
2c809f8f | 15997 | svals->push_back(Expression::make_func_code_reference(no, loc)); |
15998 | } | |
15999 | ||
db122cb9 | 16000 | Btype *btype = gogo->backend()->struct_type(bstructfields); |
16001 | std::vector<Bexpression*> ctor_bexprs; | |
16002 | for (Expression_list::const_iterator pe = svals->begin(); | |
16003 | pe != svals->end(); | |
16004 | ++pe) | |
16005 | { | |
16006 | ctor_bexprs.push_back((*pe)->get_backend(context)); | |
16007 | } | |
16008 | Bexpression* ctor = | |
16009 | gogo->backend()->constructor_expression(btype, ctor_bexprs, loc); | |
2c809f8f | 16010 | |
438b4bec | 16011 | std::string asm_name(go_selectively_encode_id(mangled_name)); |
16012 | this->bvar_ = gogo->backend()->immutable_struct(mangled_name, asm_name, false, | |
2c809f8f | 16013 | !is_public, btype, loc); |
16014 | gogo->backend()->immutable_struct_set_init(this->bvar_, mangled_name, false, | |
16015 | !is_public, btype, loc, ctor); | |
7af8e400 | 16016 | return gogo->backend()->var_expression(this->bvar_, loc); |
2c809f8f | 16017 | } |
16018 | ||
16019 | void | |
16020 | Interface_mtable_expression::do_dump_expression( | |
16021 | Ast_dump_context* ast_dump_context) const | |
16022 | { | |
16023 | ast_dump_context->ostream() << "__go_" | |
16024 | << (this->is_pointer_ ? "pimt__" : "imt_"); | |
16025 | ast_dump_context->dump_type(this->itype_); | |
16026 | ast_dump_context->ostream() << "__"; | |
16027 | ast_dump_context->dump_type(this->type_); | |
16028 | } | |
16029 | ||
16030 | Expression* | |
16031 | Expression::make_interface_mtable_ref(Interface_type* itype, Type* type, | |
16032 | bool is_pointer, Location location) | |
16033 | { | |
16034 | return new Interface_mtable_expression(itype, type, is_pointer, location); | |
16035 | } | |
16036 | ||
e440a328 | 16037 | // An expression which evaluates to the offset of a field within a |
16038 | // struct. This, like Type_info_expression, q.v., is only used to | |
16039 | // initialize fields of a type descriptor. | |
16040 | ||
16041 | class Struct_field_offset_expression : public Expression | |
16042 | { | |
16043 | public: | |
16044 | Struct_field_offset_expression(Struct_type* type, const Struct_field* field) | |
b13c66cd | 16045 | : Expression(EXPRESSION_STRUCT_FIELD_OFFSET, |
16046 | Linemap::predeclared_location()), | |
e440a328 | 16047 | type_(type), field_(field) |
16048 | { } | |
16049 | ||
16050 | protected: | |
f23d7786 | 16051 | bool |
3ae06f68 | 16052 | do_is_static_initializer() const |
f23d7786 | 16053 | { return true; } |
16054 | ||
e440a328 | 16055 | Type* |
16056 | do_type() | |
16057 | { return Type::lookup_integer_type("uintptr"); } | |
16058 | ||
16059 | void | |
16060 | do_determine_type(const Type_context*) | |
16061 | { } | |
16062 | ||
16063 | Expression* | |
16064 | do_copy() | |
16065 | { return this; } | |
16066 | ||
ea664253 | 16067 | Bexpression* |
16068 | do_get_backend(Translate_context* context); | |
e440a328 | 16069 | |
d751bb78 | 16070 | void |
16071 | do_dump_expression(Ast_dump_context*) const; | |
f03a9fbf | 16072 | |
e440a328 | 16073 | private: |
16074 | // The type of the struct. | |
16075 | Struct_type* type_; | |
16076 | // The field. | |
16077 | const Struct_field* field_; | |
16078 | }; | |
16079 | ||
ea664253 | 16080 | // Return the backend representation for a struct field offset. |
e440a328 | 16081 | |
ea664253 | 16082 | Bexpression* |
16083 | Struct_field_offset_expression::do_get_backend(Translate_context* context) | |
e440a328 | 16084 | { |
e440a328 | 16085 | const Struct_field_list* fields = this->type_->fields(); |
e440a328 | 16086 | Struct_field_list::const_iterator p; |
2c8bda43 | 16087 | unsigned i = 0; |
e440a328 | 16088 | for (p = fields->begin(); |
16089 | p != fields->end(); | |
2c8bda43 | 16090 | ++p, ++i) |
16091 | if (&*p == this->field_) | |
16092 | break; | |
c484d925 | 16093 | go_assert(&*p == this->field_); |
e440a328 | 16094 | |
2c8bda43 | 16095 | Gogo* gogo = context->gogo(); |
16096 | Btype* btype = this->type_->get_backend(gogo); | |
16097 | ||
3f378015 | 16098 | int64_t offset = gogo->backend()->type_field_offset(btype, i); |
2c8bda43 | 16099 | Type* uptr_type = Type::lookup_integer_type("uintptr"); |
e67508fa | 16100 | Expression* ret = |
3f378015 | 16101 | Expression::make_integer_int64(offset, uptr_type, |
16102 | Linemap::predeclared_location()); | |
ea664253 | 16103 | return ret->get_backend(context); |
e440a328 | 16104 | } |
16105 | ||
d751bb78 | 16106 | // Dump ast representation for a struct field offset expression. |
16107 | ||
16108 | void | |
16109 | Struct_field_offset_expression::do_dump_expression( | |
16110 | Ast_dump_context* ast_dump_context) const | |
16111 | { | |
16112 | ast_dump_context->ostream() << "unsafe.Offsetof("; | |
2d29d278 | 16113 | ast_dump_context->dump_type(this->type_); |
16114 | ast_dump_context->ostream() << '.'; | |
16115 | ast_dump_context->ostream() << | |
16116 | Gogo::message_name(this->field_->field_name()); | |
d751bb78 | 16117 | ast_dump_context->ostream() << ")"; |
16118 | } | |
16119 | ||
e440a328 | 16120 | // Make an expression for a struct field offset. |
16121 | ||
16122 | Expression* | |
16123 | Expression::make_struct_field_offset(Struct_type* type, | |
16124 | const Struct_field* field) | |
16125 | { | |
16126 | return new Struct_field_offset_expression(type, field); | |
16127 | } | |
16128 | ||
16129 | // An expression which evaluates to the address of an unnamed label. | |
16130 | ||
16131 | class Label_addr_expression : public Expression | |
16132 | { | |
16133 | public: | |
b13c66cd | 16134 | Label_addr_expression(Label* label, Location location) |
e440a328 | 16135 | : Expression(EXPRESSION_LABEL_ADDR, location), |
16136 | label_(label) | |
16137 | { } | |
16138 | ||
16139 | protected: | |
16140 | Type* | |
16141 | do_type() | |
16142 | { return Type::make_pointer_type(Type::make_void_type()); } | |
16143 | ||
16144 | void | |
16145 | do_determine_type(const Type_context*) | |
16146 | { } | |
16147 | ||
16148 | Expression* | |
16149 | do_copy() | |
16150 | { return new Label_addr_expression(this->label_, this->location()); } | |
16151 | ||
ea664253 | 16152 | Bexpression* |
16153 | do_get_backend(Translate_context* context) | |
16154 | { return this->label_->get_addr(context, this->location()); } | |
e440a328 | 16155 | |
d751bb78 | 16156 | void |
16157 | do_dump_expression(Ast_dump_context* ast_dump_context) const | |
16158 | { ast_dump_context->ostream() << this->label_->name(); } | |
f03a9fbf | 16159 | |
e440a328 | 16160 | private: |
16161 | // The label whose address we are taking. | |
16162 | Label* label_; | |
16163 | }; | |
16164 | ||
16165 | // Make an expression for the address of an unnamed label. | |
16166 | ||
16167 | Expression* | |
b13c66cd | 16168 | Expression::make_label_addr(Label* label, Location location) |
e440a328 | 16169 | { |
16170 | return new Label_addr_expression(label, location); | |
16171 | } | |
16172 | ||
da244e59 | 16173 | // Class Conditional_expression. |
283a177b | 16174 | |
2c809f8f | 16175 | // Traversal. |
16176 | ||
16177 | int | |
16178 | Conditional_expression::do_traverse(Traverse* traverse) | |
16179 | { | |
16180 | if (Expression::traverse(&this->cond_, traverse) == TRAVERSE_EXIT | |
16181 | || Expression::traverse(&this->then_, traverse) == TRAVERSE_EXIT | |
16182 | || Expression::traverse(&this->else_, traverse) == TRAVERSE_EXIT) | |
16183 | return TRAVERSE_EXIT; | |
16184 | return TRAVERSE_CONTINUE; | |
16185 | } | |
16186 | ||
283a177b | 16187 | // Return the type of the conditional expression. |
16188 | ||
16189 | Type* | |
16190 | Conditional_expression::do_type() | |
16191 | { | |
16192 | Type* result_type = Type::make_void_type(); | |
3a522dcc | 16193 | if (Type::are_identical(this->then_->type(), this->else_->type(), |
16194 | Type::COMPARE_ERRORS | Type::COMPARE_TAGS, | |
2c809f8f | 16195 | NULL)) |
283a177b | 16196 | result_type = this->then_->type(); |
16197 | else if (this->then_->is_nil_expression() | |
16198 | || this->else_->is_nil_expression()) | |
16199 | result_type = (!this->then_->is_nil_expression() | |
16200 | ? this->then_->type() | |
16201 | : this->else_->type()); | |
16202 | return result_type; | |
16203 | } | |
16204 | ||
2c809f8f | 16205 | // Determine type for a conditional expression. |
16206 | ||
16207 | void | |
16208 | Conditional_expression::do_determine_type(const Type_context* context) | |
16209 | { | |
16210 | this->cond_->determine_type_no_context(); | |
16211 | this->then_->determine_type(context); | |
16212 | this->else_->determine_type(context); | |
16213 | } | |
16214 | ||
283a177b | 16215 | // Get the backend representation of a conditional expression. |
16216 | ||
ea664253 | 16217 | Bexpression* |
16218 | Conditional_expression::do_get_backend(Translate_context* context) | |
283a177b | 16219 | { |
16220 | Gogo* gogo = context->gogo(); | |
16221 | Btype* result_btype = this->type()->get_backend(gogo); | |
ea664253 | 16222 | Bexpression* cond = this->cond_->get_backend(context); |
16223 | Bexpression* then = this->then_->get_backend(context); | |
16224 | Bexpression* belse = this->else_->get_backend(context); | |
93715b75 | 16225 | Bfunction* bfn = context->function()->func_value()->get_decl(); |
16226 | return gogo->backend()->conditional_expression(bfn, result_btype, cond, then, | |
ea664253 | 16227 | belse, this->location()); |
283a177b | 16228 | } |
16229 | ||
16230 | // Dump ast representation of a conditional expression. | |
16231 | ||
16232 | void | |
16233 | Conditional_expression::do_dump_expression( | |
16234 | Ast_dump_context* ast_dump_context) const | |
16235 | { | |
16236 | ast_dump_context->ostream() << "("; | |
16237 | ast_dump_context->dump_expression(this->cond_); | |
16238 | ast_dump_context->ostream() << " ? "; | |
16239 | ast_dump_context->dump_expression(this->then_); | |
16240 | ast_dump_context->ostream() << " : "; | |
16241 | ast_dump_context->dump_expression(this->else_); | |
16242 | ast_dump_context->ostream() << ") "; | |
16243 | } | |
16244 | ||
16245 | // Make a conditional expression. | |
16246 | ||
16247 | Expression* | |
16248 | Expression::make_conditional(Expression* cond, Expression* then, | |
16249 | Expression* else_expr, Location location) | |
16250 | { | |
16251 | return new Conditional_expression(cond, then, else_expr, location); | |
16252 | } | |
16253 | ||
da244e59 | 16254 | // Class Compound_expression. |
2c809f8f | 16255 | |
16256 | // Traversal. | |
16257 | ||
16258 | int | |
16259 | Compound_expression::do_traverse(Traverse* traverse) | |
16260 | { | |
16261 | if (Expression::traverse(&this->init_, traverse) == TRAVERSE_EXIT | |
16262 | || Expression::traverse(&this->expr_, traverse) == TRAVERSE_EXIT) | |
16263 | return TRAVERSE_EXIT; | |
16264 | return TRAVERSE_CONTINUE; | |
16265 | } | |
16266 | ||
16267 | // Return the type of the compound expression. | |
16268 | ||
16269 | Type* | |
16270 | Compound_expression::do_type() | |
16271 | { | |
16272 | return this->expr_->type(); | |
16273 | } | |
16274 | ||
16275 | // Determine type for a compound expression. | |
16276 | ||
16277 | void | |
16278 | Compound_expression::do_determine_type(const Type_context* context) | |
16279 | { | |
16280 | this->init_->determine_type_no_context(); | |
16281 | this->expr_->determine_type(context); | |
16282 | } | |
16283 | ||
16284 | // Get the backend representation of a compound expression. | |
16285 | ||
ea664253 | 16286 | Bexpression* |
16287 | Compound_expression::do_get_backend(Translate_context* context) | |
2c809f8f | 16288 | { |
16289 | Gogo* gogo = context->gogo(); | |
ea664253 | 16290 | Bexpression* binit = this->init_->get_backend(context); |
0ab48656 | 16291 | Bfunction* bfunction = context->function()->func_value()->get_decl(); |
16292 | Bstatement* init_stmt = gogo->backend()->expression_statement(bfunction, | |
16293 | binit); | |
ea664253 | 16294 | Bexpression* bexpr = this->expr_->get_backend(context); |
16295 | return gogo->backend()->compound_expression(init_stmt, bexpr, | |
16296 | this->location()); | |
2c809f8f | 16297 | } |
16298 | ||
16299 | // Dump ast representation of a conditional expression. | |
16300 | ||
16301 | void | |
16302 | Compound_expression::do_dump_expression( | |
16303 | Ast_dump_context* ast_dump_context) const | |
16304 | { | |
16305 | ast_dump_context->ostream() << "("; | |
16306 | ast_dump_context->dump_expression(this->init_); | |
16307 | ast_dump_context->ostream() << ","; | |
16308 | ast_dump_context->dump_expression(this->expr_); | |
16309 | ast_dump_context->ostream() << ") "; | |
16310 | } | |
16311 | ||
16312 | // Make a compound expression. | |
16313 | ||
16314 | Expression* | |
16315 | Expression::make_compound(Expression* init, Expression* expr, Location location) | |
16316 | { | |
16317 | return new Compound_expression(init, expr, location); | |
16318 | } | |
16319 | ||
1b4fb1e0 | 16320 | // Class Backend_expression. |
16321 | ||
16322 | int | |
16323 | Backend_expression::do_traverse(Traverse*) | |
16324 | { | |
16325 | return TRAVERSE_CONTINUE; | |
16326 | } | |
16327 | ||
de590a61 | 16328 | Expression* |
16329 | Backend_expression::do_copy() | |
16330 | { | |
16331 | return new Backend_expression(this->bexpr_, this->type_->copy_expressions(), | |
16332 | this->location()); | |
16333 | } | |
16334 | ||
1b4fb1e0 | 16335 | void |
16336 | Backend_expression::do_dump_expression(Ast_dump_context* ast_dump_context) const | |
16337 | { | |
16338 | ast_dump_context->ostream() << "backend_expression<"; | |
16339 | ast_dump_context->dump_type(this->type_); | |
16340 | ast_dump_context->ostream() << ">"; | |
16341 | } | |
16342 | ||
16343 | Expression* | |
16344 | Expression::make_backend(Bexpression* bexpr, Type* type, Location location) | |
16345 | { | |
16346 | return new Backend_expression(bexpr, type, location); | |
16347 | } | |
16348 | ||
e440a328 | 16349 | // Import an expression. This comes at the end in order to see the |
16350 | // various class definitions. | |
16351 | ||
16352 | Expression* | |
bc8e2ef4 | 16353 | Expression::import_expression(Import_expression* imp, Location loc) |
e440a328 | 16354 | { |
16355 | int c = imp->peek_char(); | |
5f6f5357 | 16356 | if (c == '+' || c == '-' || c == '!' || c == '^' || c == '&' || c == '*') |
9b92780c | 16357 | return Unary_expression::do_import(imp, loc); |
e440a328 | 16358 | else if (c == '(') |
9b92780c | 16359 | return Binary_expression::do_import(imp, loc); |
204d4af4 | 16360 | else if (imp->match_c_string("$true") |
16361 | || imp->match_c_string("$false") | |
16362 | || (imp->version() < EXPORT_FORMAT_V3 | |
16363 | && (imp->match_c_string("true") | |
16364 | || imp->match_c_string("false")))) | |
9b92780c | 16365 | return Boolean_expression::do_import(imp, loc); |
e440a328 | 16366 | else if (c == '"') |
9b92780c | 16367 | return String_expression::do_import(imp, loc); |
e440a328 | 16368 | else if (c == '-' || (c >= '0' && c <= '9')) |
16369 | { | |
16370 | // This handles integers, floats and complex constants. | |
9b92780c | 16371 | return Integer_expression::do_import(imp, loc); |
e440a328 | 16372 | } |
204d4af4 | 16373 | else if (imp->match_c_string("$nil") |
16374 | || (imp->version() < EXPORT_FORMAT_V3 | |
16375 | && imp->match_c_string("nil"))) | |
9b92780c | 16376 | return Nil_expression::do_import(imp, loc); |
204d4af4 | 16377 | else if (imp->match_c_string("$convert") |
16378 | || (imp->version() < EXPORT_FORMAT_V3 | |
16379 | && imp->match_c_string("convert"))) | |
9b92780c | 16380 | return Type_conversion_expression::do_import(imp, loc); |
5f6f5357 | 16381 | |
16382 | Import_function_body* ifb = imp->ifb(); | |
16383 | if (ifb == NULL) | |
e440a328 | 16384 | { |
631d5788 | 16385 | go_error_at(imp->location(), "import error: expected expression"); |
9b92780c | 16386 | return Expression::make_error(loc); |
e440a328 | 16387 | } |
5f6f5357 | 16388 | if (ifb->saw_error()) |
16389 | return Expression::make_error(loc); | |
16390 | std::string id = ifb->read_identifier(); | |
16391 | if (id.empty()) | |
16392 | { | |
16393 | if (!ifb->saw_error()) | |
16394 | go_error_at(imp->location(), | |
16395 | "import error: expected identifier at %lu", | |
16396 | static_cast<unsigned long>(ifb->off())); | |
16397 | ifb->set_saw_error(); | |
16398 | return Expression::make_error(loc); | |
16399 | } | |
16400 | Named_object* var = ifb->block()->bindings()->lookup(id); | |
16401 | if (var == NULL) | |
16402 | { | |
16403 | if (!ifb->saw_error()) | |
16404 | go_error_at(imp->location(), "import error: lookup of %qs failed", | |
16405 | id.c_str()); | |
16406 | ifb->set_saw_error(); | |
16407 | return Expression::make_error(loc); | |
16408 | } | |
16409 | return Expression::make_var_reference(var, loc); | |
e440a328 | 16410 | } |
16411 | ||
16412 | // Class Expression_list. | |
16413 | ||
16414 | // Traverse the list. | |
16415 | ||
16416 | int | |
16417 | Expression_list::traverse(Traverse* traverse) | |
16418 | { | |
16419 | for (Expression_list::iterator p = this->begin(); | |
16420 | p != this->end(); | |
16421 | ++p) | |
16422 | { | |
16423 | if (*p != NULL) | |
16424 | { | |
16425 | if (Expression::traverse(&*p, traverse) == TRAVERSE_EXIT) | |
16426 | return TRAVERSE_EXIT; | |
16427 | } | |
16428 | } | |
16429 | return TRAVERSE_CONTINUE; | |
16430 | } | |
16431 | ||
16432 | // Copy the list. | |
16433 | ||
16434 | Expression_list* | |
16435 | Expression_list::copy() | |
16436 | { | |
16437 | Expression_list* ret = new Expression_list(); | |
16438 | for (Expression_list::iterator p = this->begin(); | |
16439 | p != this->end(); | |
16440 | ++p) | |
16441 | { | |
16442 | if (*p == NULL) | |
16443 | ret->push_back(NULL); | |
16444 | else | |
16445 | ret->push_back((*p)->copy()); | |
16446 | } | |
16447 | return ret; | |
16448 | } | |
16449 | ||
16450 | // Return whether an expression list has an error expression. | |
16451 | ||
16452 | bool | |
16453 | Expression_list::contains_error() const | |
16454 | { | |
16455 | for (Expression_list::const_iterator p = this->begin(); | |
16456 | p != this->end(); | |
16457 | ++p) | |
16458 | if (*p != NULL && (*p)->is_error_expression()) | |
16459 | return true; | |
16460 | return false; | |
16461 | } | |
0c77715b | 16462 | |
16463 | // Class Numeric_constant. | |
16464 | ||
16465 | // Destructor. | |
16466 | ||
16467 | Numeric_constant::~Numeric_constant() | |
16468 | { | |
16469 | this->clear(); | |
16470 | } | |
16471 | ||
16472 | // Copy constructor. | |
16473 | ||
16474 | Numeric_constant::Numeric_constant(const Numeric_constant& a) | |
16475 | : classification_(a.classification_), type_(a.type_) | |
16476 | { | |
16477 | switch (a.classification_) | |
16478 | { | |
16479 | case NC_INVALID: | |
16480 | break; | |
16481 | case NC_INT: | |
16482 | case NC_RUNE: | |
16483 | mpz_init_set(this->u_.int_val, a.u_.int_val); | |
16484 | break; | |
16485 | case NC_FLOAT: | |
16486 | mpfr_init_set(this->u_.float_val, a.u_.float_val, GMP_RNDN); | |
16487 | break; | |
16488 | case NC_COMPLEX: | |
fcbea5e4 | 16489 | mpc_init2(this->u_.complex_val, mpc_precision); |
16490 | mpc_set(this->u_.complex_val, a.u_.complex_val, MPC_RNDNN); | |
0c77715b | 16491 | break; |
16492 | default: | |
16493 | go_unreachable(); | |
16494 | } | |
16495 | } | |
16496 | ||
16497 | // Assignment operator. | |
16498 | ||
16499 | Numeric_constant& | |
16500 | Numeric_constant::operator=(const Numeric_constant& a) | |
16501 | { | |
16502 | this->clear(); | |
16503 | this->classification_ = a.classification_; | |
16504 | this->type_ = a.type_; | |
16505 | switch (a.classification_) | |
16506 | { | |
16507 | case NC_INVALID: | |
16508 | break; | |
16509 | case NC_INT: | |
16510 | case NC_RUNE: | |
16511 | mpz_init_set(this->u_.int_val, a.u_.int_val); | |
16512 | break; | |
16513 | case NC_FLOAT: | |
16514 | mpfr_init_set(this->u_.float_val, a.u_.float_val, GMP_RNDN); | |
16515 | break; | |
16516 | case NC_COMPLEX: | |
fcbea5e4 | 16517 | mpc_init2(this->u_.complex_val, mpc_precision); |
16518 | mpc_set(this->u_.complex_val, a.u_.complex_val, MPC_RNDNN); | |
0c77715b | 16519 | break; |
16520 | default: | |
16521 | go_unreachable(); | |
16522 | } | |
16523 | return *this; | |
16524 | } | |
16525 | ||
0ab32342 | 16526 | // Check equality with another numeric constant. |
16527 | ||
16528 | bool | |
16529 | Numeric_constant::equals(const Numeric_constant& a) const | |
16530 | { | |
16531 | if (this->classification_ != a.classification_) | |
16532 | return false; | |
16533 | ||
16534 | if (this->type_ != NULL && a.type_ != NULL | |
16535 | && !Type::are_identical(this->type_, a.type_, | |
16536 | Type::COMPARE_ALIASES, NULL)) | |
16537 | return false; | |
16538 | ||
16539 | switch (a.classification_) | |
16540 | { | |
16541 | case NC_INVALID: | |
16542 | break; | |
16543 | case NC_INT: | |
16544 | case NC_RUNE: | |
16545 | return mpz_cmp(this->u_.int_val, a.u_.int_val) == 0; | |
16546 | case NC_FLOAT: | |
16547 | return mpfr_cmp(this->u_.float_val, a.u_.float_val) == 0; | |
16548 | case NC_COMPLEX: | |
16549 | return mpc_cmp(this->u_.complex_val, a.u_.complex_val) == 0; | |
16550 | default: | |
16551 | go_unreachable(); | |
16552 | } | |
16553 | return false; | |
16554 | } | |
16555 | ||
0c77715b | 16556 | // Clear the contents. |
16557 | ||
16558 | void | |
16559 | Numeric_constant::clear() | |
16560 | { | |
16561 | switch (this->classification_) | |
16562 | { | |
16563 | case NC_INVALID: | |
16564 | break; | |
16565 | case NC_INT: | |
16566 | case NC_RUNE: | |
16567 | mpz_clear(this->u_.int_val); | |
16568 | break; | |
16569 | case NC_FLOAT: | |
16570 | mpfr_clear(this->u_.float_val); | |
16571 | break; | |
16572 | case NC_COMPLEX: | |
fcbea5e4 | 16573 | mpc_clear(this->u_.complex_val); |
0c77715b | 16574 | break; |
16575 | default: | |
16576 | go_unreachable(); | |
16577 | } | |
16578 | this->classification_ = NC_INVALID; | |
16579 | } | |
16580 | ||
16581 | // Set to an unsigned long value. | |
16582 | ||
16583 | void | |
16584 | Numeric_constant::set_unsigned_long(Type* type, unsigned long val) | |
16585 | { | |
16586 | this->clear(); | |
16587 | this->classification_ = NC_INT; | |
16588 | this->type_ = type; | |
16589 | mpz_init_set_ui(this->u_.int_val, val); | |
16590 | } | |
16591 | ||
16592 | // Set to an integer value. | |
16593 | ||
16594 | void | |
16595 | Numeric_constant::set_int(Type* type, const mpz_t val) | |
16596 | { | |
16597 | this->clear(); | |
16598 | this->classification_ = NC_INT; | |
16599 | this->type_ = type; | |
16600 | mpz_init_set(this->u_.int_val, val); | |
16601 | } | |
16602 | ||
16603 | // Set to a rune value. | |
16604 | ||
16605 | void | |
16606 | Numeric_constant::set_rune(Type* type, const mpz_t val) | |
16607 | { | |
16608 | this->clear(); | |
16609 | this->classification_ = NC_RUNE; | |
16610 | this->type_ = type; | |
16611 | mpz_init_set(this->u_.int_val, val); | |
16612 | } | |
16613 | ||
16614 | // Set to a floating point value. | |
16615 | ||
16616 | void | |
16617 | Numeric_constant::set_float(Type* type, const mpfr_t val) | |
16618 | { | |
16619 | this->clear(); | |
16620 | this->classification_ = NC_FLOAT; | |
16621 | this->type_ = type; | |
d1d4ace3 | 16622 | |
833b523c | 16623 | // Numeric constants do not have negative zero values, so remove |
16624 | // them here. They also don't have infinity or NaN values, but we | |
16625 | // should never see them here. | |
d1d4ace3 | 16626 | int bits = 0; |
16627 | if (type != NULL | |
16628 | && type->float_type() != NULL | |
16629 | && !type->float_type()->is_abstract()) | |
16630 | bits = type->float_type()->bits(); | |
16631 | if (Numeric_constant::is_float_neg_zero(val, bits)) | |
833b523c | 16632 | mpfr_init_set_ui(this->u_.float_val, 0, GMP_RNDN); |
16633 | else | |
16634 | mpfr_init_set(this->u_.float_val, val, GMP_RNDN); | |
0c77715b | 16635 | } |
16636 | ||
16637 | // Set to a complex value. | |
16638 | ||
16639 | void | |
fcbea5e4 | 16640 | Numeric_constant::set_complex(Type* type, const mpc_t val) |
0c77715b | 16641 | { |
16642 | this->clear(); | |
16643 | this->classification_ = NC_COMPLEX; | |
16644 | this->type_ = type; | |
d1d4ace3 | 16645 | |
16646 | // Avoid negative zero as in set_float. | |
16647 | int bits = 0; | |
16648 | if (type != NULL | |
16649 | && type->complex_type() != NULL | |
16650 | && !type->complex_type()->is_abstract()) | |
16651 | bits = type->complex_type()->bits() / 2; | |
16652 | ||
16653 | mpfr_t real; | |
16654 | mpfr_init_set(real, mpc_realref(val), GMP_RNDN); | |
16655 | if (Numeric_constant::is_float_neg_zero(real, bits)) | |
16656 | mpfr_set_ui(real, 0, GMP_RNDN); | |
16657 | ||
16658 | mpfr_t imag; | |
16659 | mpfr_init_set(imag, mpc_imagref(val), GMP_RNDN); | |
16660 | if (Numeric_constant::is_float_neg_zero(imag, bits)) | |
16661 | mpfr_set_ui(imag, 0, GMP_RNDN); | |
16662 | ||
fcbea5e4 | 16663 | mpc_init2(this->u_.complex_val, mpc_precision); |
d1d4ace3 | 16664 | mpc_set_fr_fr(this->u_.complex_val, real, imag, MPC_RNDNN); |
16665 | ||
16666 | mpfr_clear(real); | |
16667 | mpfr_clear(imag); | |
16668 | } | |
16669 | ||
16670 | // Return whether VAL, at a precision of BITS, is a negative zero. | |
16671 | // BITS may be zero in which case it is ignored. | |
16672 | ||
16673 | bool | |
16674 | Numeric_constant::is_float_neg_zero(const mpfr_t val, int bits) | |
16675 | { | |
16676 | if (!mpfr_signbit(val)) | |
16677 | return false; | |
16678 | if (mpfr_zero_p(val)) | |
16679 | return true; | |
16680 | mp_exp_t min_exp; | |
16681 | switch (bits) | |
16682 | { | |
16683 | case 0: | |
16684 | return false; | |
16685 | case 32: | |
16686 | // In a denormalized float32 the exponent is -126, and there are | |
16687 | // 24 bits of which at least the last must be 1, so the smallest | |
16688 | // representable non-zero exponent is -126 - (24 - 1) == -149. | |
16689 | min_exp = -149; | |
16690 | break; | |
16691 | case 64: | |
16692 | // Minimum exponent is -1022, there are 53 bits. | |
16693 | min_exp = -1074; | |
16694 | break; | |
16695 | default: | |
16696 | go_unreachable(); | |
16697 | } | |
16698 | return mpfr_get_exp(val) < min_exp; | |
0c77715b | 16699 | } |
16700 | ||
16701 | // Get an int value. | |
16702 | ||
16703 | void | |
16704 | Numeric_constant::get_int(mpz_t* val) const | |
16705 | { | |
16706 | go_assert(this->is_int()); | |
16707 | mpz_init_set(*val, this->u_.int_val); | |
16708 | } | |
16709 | ||
16710 | // Get a rune value. | |
16711 | ||
16712 | void | |
16713 | Numeric_constant::get_rune(mpz_t* val) const | |
16714 | { | |
16715 | go_assert(this->is_rune()); | |
16716 | mpz_init_set(*val, this->u_.int_val); | |
16717 | } | |
16718 | ||
16719 | // Get a floating point value. | |
16720 | ||
16721 | void | |
16722 | Numeric_constant::get_float(mpfr_t* val) const | |
16723 | { | |
16724 | go_assert(this->is_float()); | |
16725 | mpfr_init_set(*val, this->u_.float_val, GMP_RNDN); | |
16726 | } | |
16727 | ||
16728 | // Get a complex value. | |
16729 | ||
16730 | void | |
fcbea5e4 | 16731 | Numeric_constant::get_complex(mpc_t* val) const |
0c77715b | 16732 | { |
16733 | go_assert(this->is_complex()); | |
fcbea5e4 | 16734 | mpc_init2(*val, mpc_precision); |
16735 | mpc_set(*val, this->u_.complex_val, MPC_RNDNN); | |
0c77715b | 16736 | } |
16737 | ||
16738 | // Express value as unsigned long if possible. | |
16739 | ||
16740 | Numeric_constant::To_unsigned_long | |
16741 | Numeric_constant::to_unsigned_long(unsigned long* val) const | |
16742 | { | |
16743 | switch (this->classification_) | |
16744 | { | |
16745 | case NC_INT: | |
16746 | case NC_RUNE: | |
16747 | return this->mpz_to_unsigned_long(this->u_.int_val, val); | |
16748 | case NC_FLOAT: | |
16749 | return this->mpfr_to_unsigned_long(this->u_.float_val, val); | |
16750 | case NC_COMPLEX: | |
fcbea5e4 | 16751 | if (!mpfr_zero_p(mpc_imagref(this->u_.complex_val))) |
0c77715b | 16752 | return NC_UL_NOTINT; |
fcbea5e4 | 16753 | return this->mpfr_to_unsigned_long(mpc_realref(this->u_.complex_val), |
16754 | val); | |
0c77715b | 16755 | default: |
16756 | go_unreachable(); | |
16757 | } | |
16758 | } | |
16759 | ||
16760 | // Express integer value as unsigned long if possible. | |
16761 | ||
16762 | Numeric_constant::To_unsigned_long | |
16763 | Numeric_constant::mpz_to_unsigned_long(const mpz_t ival, | |
16764 | unsigned long *val) const | |
16765 | { | |
16766 | if (mpz_sgn(ival) < 0) | |
16767 | return NC_UL_NEGATIVE; | |
16768 | unsigned long ui = mpz_get_ui(ival); | |
16769 | if (mpz_cmp_ui(ival, ui) != 0) | |
16770 | return NC_UL_BIG; | |
16771 | *val = ui; | |
16772 | return NC_UL_VALID; | |
16773 | } | |
16774 | ||
16775 | // Express floating point value as unsigned long if possible. | |
16776 | ||
16777 | Numeric_constant::To_unsigned_long | |
16778 | Numeric_constant::mpfr_to_unsigned_long(const mpfr_t fval, | |
16779 | unsigned long *val) const | |
16780 | { | |
16781 | if (!mpfr_integer_p(fval)) | |
16782 | return NC_UL_NOTINT; | |
16783 | mpz_t ival; | |
16784 | mpz_init(ival); | |
16785 | mpfr_get_z(ival, fval, GMP_RNDN); | |
16786 | To_unsigned_long ret = this->mpz_to_unsigned_long(ival, val); | |
16787 | mpz_clear(ival); | |
16788 | return ret; | |
16789 | } | |
16790 | ||
03118c21 | 16791 | // Express value as memory size if possible. |
16792 | ||
16793 | bool | |
16794 | Numeric_constant::to_memory_size(int64_t* val) const | |
16795 | { | |
16796 | switch (this->classification_) | |
16797 | { | |
16798 | case NC_INT: | |
16799 | case NC_RUNE: | |
16800 | return this->mpz_to_memory_size(this->u_.int_val, val); | |
16801 | case NC_FLOAT: | |
16802 | return this->mpfr_to_memory_size(this->u_.float_val, val); | |
16803 | case NC_COMPLEX: | |
16804 | if (!mpfr_zero_p(mpc_imagref(this->u_.complex_val))) | |
16805 | return false; | |
16806 | return this->mpfr_to_memory_size(mpc_realref(this->u_.complex_val), val); | |
16807 | default: | |
16808 | go_unreachable(); | |
16809 | } | |
16810 | } | |
16811 | ||
16812 | // Express integer as memory size if possible. | |
16813 | ||
16814 | bool | |
16815 | Numeric_constant::mpz_to_memory_size(const mpz_t ival, int64_t* val) const | |
16816 | { | |
16817 | if (mpz_sgn(ival) < 0) | |
16818 | return false; | |
16819 | if (mpz_fits_slong_p(ival)) | |
16820 | { | |
16821 | *val = static_cast<int64_t>(mpz_get_si(ival)); | |
16822 | return true; | |
16823 | } | |
16824 | ||
16825 | // Test >= 64, not > 64, because an int64_t can hold 63 bits of a | |
16826 | // positive value. | |
16827 | if (mpz_sizeinbase(ival, 2) >= 64) | |
16828 | return false; | |
16829 | ||
16830 | mpz_t q, r; | |
16831 | mpz_init(q); | |
16832 | mpz_init(r); | |
16833 | mpz_tdiv_q_2exp(q, ival, 32); | |
16834 | mpz_tdiv_r_2exp(r, ival, 32); | |
16835 | go_assert(mpz_fits_ulong_p(q) && mpz_fits_ulong_p(r)); | |
16836 | *val = ((static_cast<int64_t>(mpz_get_ui(q)) << 32) | |
16837 | + static_cast<int64_t>(mpz_get_ui(r))); | |
16838 | mpz_clear(r); | |
16839 | mpz_clear(q); | |
16840 | return true; | |
16841 | } | |
16842 | ||
16843 | // Express floating point value as memory size if possible. | |
16844 | ||
16845 | bool | |
16846 | Numeric_constant::mpfr_to_memory_size(const mpfr_t fval, int64_t* val) const | |
16847 | { | |
16848 | if (!mpfr_integer_p(fval)) | |
16849 | return false; | |
16850 | mpz_t ival; | |
16851 | mpz_init(ival); | |
16852 | mpfr_get_z(ival, fval, GMP_RNDN); | |
16853 | bool ret = this->mpz_to_memory_size(ival, val); | |
16854 | mpz_clear(ival); | |
16855 | return ret; | |
16856 | } | |
16857 | ||
0c77715b | 16858 | // Convert value to integer if possible. |
16859 | ||
16860 | bool | |
16861 | Numeric_constant::to_int(mpz_t* val) const | |
16862 | { | |
16863 | switch (this->classification_) | |
16864 | { | |
16865 | case NC_INT: | |
16866 | case NC_RUNE: | |
16867 | mpz_init_set(*val, this->u_.int_val); | |
16868 | return true; | |
16869 | case NC_FLOAT: | |
16870 | if (!mpfr_integer_p(this->u_.float_val)) | |
16871 | return false; | |
16872 | mpz_init(*val); | |
16873 | mpfr_get_z(*val, this->u_.float_val, GMP_RNDN); | |
16874 | return true; | |
16875 | case NC_COMPLEX: | |
fcbea5e4 | 16876 | if (!mpfr_zero_p(mpc_imagref(this->u_.complex_val)) |
16877 | || !mpfr_integer_p(mpc_realref(this->u_.complex_val))) | |
0c77715b | 16878 | return false; |
16879 | mpz_init(*val); | |
fcbea5e4 | 16880 | mpfr_get_z(*val, mpc_realref(this->u_.complex_val), GMP_RNDN); |
0c77715b | 16881 | return true; |
16882 | default: | |
16883 | go_unreachable(); | |
16884 | } | |
16885 | } | |
16886 | ||
16887 | // Convert value to floating point if possible. | |
16888 | ||
16889 | bool | |
16890 | Numeric_constant::to_float(mpfr_t* val) const | |
16891 | { | |
16892 | switch (this->classification_) | |
16893 | { | |
16894 | case NC_INT: | |
16895 | case NC_RUNE: | |
16896 | mpfr_init_set_z(*val, this->u_.int_val, GMP_RNDN); | |
16897 | return true; | |
16898 | case NC_FLOAT: | |
16899 | mpfr_init_set(*val, this->u_.float_val, GMP_RNDN); | |
16900 | return true; | |
16901 | case NC_COMPLEX: | |
fcbea5e4 | 16902 | if (!mpfr_zero_p(mpc_imagref(this->u_.complex_val))) |
0c77715b | 16903 | return false; |
fcbea5e4 | 16904 | mpfr_init_set(*val, mpc_realref(this->u_.complex_val), GMP_RNDN); |
0c77715b | 16905 | return true; |
16906 | default: | |
16907 | go_unreachable(); | |
16908 | } | |
16909 | } | |
16910 | ||
16911 | // Convert value to complex. | |
16912 | ||
16913 | bool | |
fcbea5e4 | 16914 | Numeric_constant::to_complex(mpc_t* val) const |
0c77715b | 16915 | { |
fcbea5e4 | 16916 | mpc_init2(*val, mpc_precision); |
0c77715b | 16917 | switch (this->classification_) |
16918 | { | |
16919 | case NC_INT: | |
16920 | case NC_RUNE: | |
fcbea5e4 | 16921 | mpc_set_z(*val, this->u_.int_val, MPC_RNDNN); |
0c77715b | 16922 | return true; |
16923 | case NC_FLOAT: | |
fcbea5e4 | 16924 | mpc_set_fr(*val, this->u_.float_val, MPC_RNDNN); |
0c77715b | 16925 | return true; |
16926 | case NC_COMPLEX: | |
fcbea5e4 | 16927 | mpc_set(*val, this->u_.complex_val, MPC_RNDNN); |
0c77715b | 16928 | return true; |
16929 | default: | |
16930 | go_unreachable(); | |
16931 | } | |
16932 | } | |
16933 | ||
16934 | // Get the type. | |
16935 | ||
16936 | Type* | |
16937 | Numeric_constant::type() const | |
16938 | { | |
16939 | if (this->type_ != NULL) | |
16940 | return this->type_; | |
16941 | switch (this->classification_) | |
16942 | { | |
16943 | case NC_INT: | |
16944 | return Type::make_abstract_integer_type(); | |
16945 | case NC_RUNE: | |
16946 | return Type::make_abstract_character_type(); | |
16947 | case NC_FLOAT: | |
16948 | return Type::make_abstract_float_type(); | |
16949 | case NC_COMPLEX: | |
16950 | return Type::make_abstract_complex_type(); | |
16951 | default: | |
16952 | go_unreachable(); | |
16953 | } | |
16954 | } | |
16955 | ||
16956 | // If the constant can be expressed in TYPE, then set the type of the | |
16957 | // constant to TYPE and return true. Otherwise return false, and, if | |
16958 | // ISSUE_ERROR is true, report an appropriate error message. | |
16959 | ||
16960 | bool | |
16961 | Numeric_constant::set_type(Type* type, bool issue_error, Location loc) | |
16962 | { | |
16963 | bool ret; | |
f11c2155 | 16964 | if (type == NULL || type->is_error()) |
0c77715b | 16965 | ret = true; |
16966 | else if (type->integer_type() != NULL) | |
16967 | ret = this->check_int_type(type->integer_type(), issue_error, loc); | |
16968 | else if (type->float_type() != NULL) | |
16969 | ret = this->check_float_type(type->float_type(), issue_error, loc); | |
16970 | else if (type->complex_type() != NULL) | |
16971 | ret = this->check_complex_type(type->complex_type(), issue_error, loc); | |
16972 | else | |
5706ab68 | 16973 | { |
16974 | ret = false; | |
16975 | if (issue_error) | |
16976 | go_assert(saw_errors()); | |
16977 | } | |
0c77715b | 16978 | if (ret) |
16979 | this->type_ = type; | |
16980 | return ret; | |
16981 | } | |
16982 | ||
16983 | // Check whether the constant can be expressed in an integer type. | |
16984 | ||
16985 | bool | |
16986 | Numeric_constant::check_int_type(Integer_type* type, bool issue_error, | |
71a45216 | 16987 | Location location) |
0c77715b | 16988 | { |
16989 | mpz_t val; | |
16990 | switch (this->classification_) | |
16991 | { | |
16992 | case NC_INT: | |
16993 | case NC_RUNE: | |
16994 | mpz_init_set(val, this->u_.int_val); | |
16995 | break; | |
16996 | ||
16997 | case NC_FLOAT: | |
16998 | if (!mpfr_integer_p(this->u_.float_val)) | |
16999 | { | |
17000 | if (issue_error) | |
71a45216 | 17001 | { |
631d5788 | 17002 | go_error_at(location, |
17003 | "floating point constant truncated to integer"); | |
71a45216 | 17004 | this->set_invalid(); |
17005 | } | |
0c77715b | 17006 | return false; |
17007 | } | |
17008 | mpz_init(val); | |
17009 | mpfr_get_z(val, this->u_.float_val, GMP_RNDN); | |
17010 | break; | |
17011 | ||
17012 | case NC_COMPLEX: | |
fcbea5e4 | 17013 | if (!mpfr_integer_p(mpc_realref(this->u_.complex_val)) |
17014 | || !mpfr_zero_p(mpc_imagref(this->u_.complex_val))) | |
0c77715b | 17015 | { |
17016 | if (issue_error) | |
71a45216 | 17017 | { |
631d5788 | 17018 | go_error_at(location, "complex constant truncated to integer"); |
71a45216 | 17019 | this->set_invalid(); |
17020 | } | |
0c77715b | 17021 | return false; |
17022 | } | |
17023 | mpz_init(val); | |
fcbea5e4 | 17024 | mpfr_get_z(val, mpc_realref(this->u_.complex_val), GMP_RNDN); |
0c77715b | 17025 | break; |
17026 | ||
17027 | default: | |
17028 | go_unreachable(); | |
17029 | } | |
17030 | ||
17031 | bool ret; | |
17032 | if (type->is_abstract()) | |
17033 | ret = true; | |
17034 | else | |
17035 | { | |
17036 | int bits = mpz_sizeinbase(val, 2); | |
17037 | if (type->is_unsigned()) | |
17038 | { | |
17039 | // For an unsigned type we can only accept a nonnegative | |
17040 | // number, and we must be able to represents at least BITS. | |
17041 | ret = mpz_sgn(val) >= 0 && bits <= type->bits(); | |
17042 | } | |
17043 | else | |
17044 | { | |
17045 | // For a signed type we need an extra bit to indicate the | |
17046 | // sign. We have to handle the most negative integer | |
17047 | // specially. | |
17048 | ret = (bits + 1 <= type->bits() | |
17049 | || (bits <= type->bits() | |
17050 | && mpz_sgn(val) < 0 | |
17051 | && (mpz_scan1(val, 0) | |
17052 | == static_cast<unsigned long>(type->bits() - 1)) | |
17053 | && mpz_scan0(val, type->bits()) == ULONG_MAX)); | |
17054 | } | |
17055 | } | |
17056 | ||
17057 | if (!ret && issue_error) | |
71a45216 | 17058 | { |
631d5788 | 17059 | go_error_at(location, "integer constant overflow"); |
71a45216 | 17060 | this->set_invalid(); |
17061 | } | |
0c77715b | 17062 | |
17063 | return ret; | |
17064 | } | |
17065 | ||
17066 | // Check whether the constant can be expressed in a floating point | |
17067 | // type. | |
17068 | ||
17069 | bool | |
17070 | Numeric_constant::check_float_type(Float_type* type, bool issue_error, | |
d0bcce51 | 17071 | Location location) |
0c77715b | 17072 | { |
17073 | mpfr_t val; | |
17074 | switch (this->classification_) | |
17075 | { | |
17076 | case NC_INT: | |
17077 | case NC_RUNE: | |
17078 | mpfr_init_set_z(val, this->u_.int_val, GMP_RNDN); | |
17079 | break; | |
17080 | ||
17081 | case NC_FLOAT: | |
17082 | mpfr_init_set(val, this->u_.float_val, GMP_RNDN); | |
17083 | break; | |
17084 | ||
17085 | case NC_COMPLEX: | |
fcbea5e4 | 17086 | if (!mpfr_zero_p(mpc_imagref(this->u_.complex_val))) |
0c77715b | 17087 | { |
17088 | if (issue_error) | |
71a45216 | 17089 | { |
17090 | this->set_invalid(); | |
631d5788 | 17091 | go_error_at(location, "complex constant truncated to float"); |
71a45216 | 17092 | } |
0c77715b | 17093 | return false; |
17094 | } | |
fcbea5e4 | 17095 | mpfr_init_set(val, mpc_realref(this->u_.complex_val), GMP_RNDN); |
0c77715b | 17096 | break; |
17097 | ||
17098 | default: | |
17099 | go_unreachable(); | |
17100 | } | |
17101 | ||
17102 | bool ret; | |
17103 | if (type->is_abstract()) | |
17104 | ret = true; | |
17105 | else if (mpfr_nan_p(val) || mpfr_inf_p(val) || mpfr_zero_p(val)) | |
17106 | { | |
17107 | // A NaN or Infinity always fits in the range of the type. | |
17108 | ret = true; | |
17109 | } | |
17110 | else | |
17111 | { | |
17112 | mp_exp_t exp = mpfr_get_exp(val); | |
17113 | mp_exp_t max_exp; | |
17114 | switch (type->bits()) | |
17115 | { | |
17116 | case 32: | |
17117 | max_exp = 128; | |
17118 | break; | |
17119 | case 64: | |
17120 | max_exp = 1024; | |
17121 | break; | |
17122 | default: | |
17123 | go_unreachable(); | |
17124 | } | |
17125 | ||
17126 | ret = exp <= max_exp; | |
d0bcce51 | 17127 | |
17128 | if (ret) | |
17129 | { | |
17130 | // Round the constant to the desired type. | |
17131 | mpfr_t t; | |
17132 | mpfr_init(t); | |
17133 | switch (type->bits()) | |
17134 | { | |
17135 | case 32: | |
17136 | mpfr_set_prec(t, 24); | |
17137 | break; | |
17138 | case 64: | |
17139 | mpfr_set_prec(t, 53); | |
17140 | break; | |
17141 | default: | |
17142 | go_unreachable(); | |
17143 | } | |
17144 | mpfr_set(t, val, GMP_RNDN); | |
17145 | mpfr_set(val, t, GMP_RNDN); | |
17146 | mpfr_clear(t); | |
17147 | ||
17148 | this->set_float(type, val); | |
17149 | } | |
0c77715b | 17150 | } |
17151 | ||
17152 | mpfr_clear(val); | |
17153 | ||
17154 | if (!ret && issue_error) | |
71a45216 | 17155 | { |
631d5788 | 17156 | go_error_at(location, "floating point constant overflow"); |
71a45216 | 17157 | this->set_invalid(); |
17158 | } | |
0c77715b | 17159 | |
17160 | return ret; | |
f03a9fbf | 17161 | } |
0c77715b | 17162 | |
17163 | // Check whether the constant can be expressed in a complex type. | |
17164 | ||
17165 | bool | |
17166 | Numeric_constant::check_complex_type(Complex_type* type, bool issue_error, | |
d0bcce51 | 17167 | Location location) |
0c77715b | 17168 | { |
17169 | if (type->is_abstract()) | |
17170 | return true; | |
17171 | ||
17172 | mp_exp_t max_exp; | |
17173 | switch (type->bits()) | |
17174 | { | |
17175 | case 64: | |
17176 | max_exp = 128; | |
17177 | break; | |
17178 | case 128: | |
17179 | max_exp = 1024; | |
17180 | break; | |
17181 | default: | |
17182 | go_unreachable(); | |
17183 | } | |
17184 | ||
fcbea5e4 | 17185 | mpc_t val; |
17186 | mpc_init2(val, mpc_precision); | |
0c77715b | 17187 | switch (this->classification_) |
17188 | { | |
17189 | case NC_INT: | |
17190 | case NC_RUNE: | |
fcbea5e4 | 17191 | mpc_set_z(val, this->u_.int_val, MPC_RNDNN); |
0c77715b | 17192 | break; |
17193 | ||
17194 | case NC_FLOAT: | |
fcbea5e4 | 17195 | mpc_set_fr(val, this->u_.float_val, MPC_RNDNN); |
0c77715b | 17196 | break; |
17197 | ||
17198 | case NC_COMPLEX: | |
fcbea5e4 | 17199 | mpc_set(val, this->u_.complex_val, MPC_RNDNN); |
0c77715b | 17200 | break; |
17201 | ||
17202 | default: | |
17203 | go_unreachable(); | |
17204 | } | |
17205 | ||
d0bcce51 | 17206 | bool ret = true; |
fcbea5e4 | 17207 | if (!mpfr_nan_p(mpc_realref(val)) |
17208 | && !mpfr_inf_p(mpc_realref(val)) | |
17209 | && !mpfr_zero_p(mpc_realref(val)) | |
17210 | && mpfr_get_exp(mpc_realref(val)) > max_exp) | |
d0bcce51 | 17211 | { |
17212 | if (issue_error) | |
71a45216 | 17213 | { |
631d5788 | 17214 | go_error_at(location, "complex real part overflow"); |
71a45216 | 17215 | this->set_invalid(); |
17216 | } | |
d0bcce51 | 17217 | ret = false; |
17218 | } | |
0c77715b | 17219 | |
fcbea5e4 | 17220 | if (!mpfr_nan_p(mpc_imagref(val)) |
17221 | && !mpfr_inf_p(mpc_imagref(val)) | |
17222 | && !mpfr_zero_p(mpc_imagref(val)) | |
17223 | && mpfr_get_exp(mpc_imagref(val)) > max_exp) | |
d0bcce51 | 17224 | { |
17225 | if (issue_error) | |
71a45216 | 17226 | { |
631d5788 | 17227 | go_error_at(location, "complex imaginary part overflow"); |
71a45216 | 17228 | this->set_invalid(); |
17229 | } | |
d0bcce51 | 17230 | ret = false; |
17231 | } | |
0c77715b | 17232 | |
d0bcce51 | 17233 | if (ret) |
17234 | { | |
17235 | // Round the constant to the desired type. | |
fcbea5e4 | 17236 | mpc_t t; |
d0bcce51 | 17237 | switch (type->bits()) |
17238 | { | |
17239 | case 64: | |
fcbea5e4 | 17240 | mpc_init2(t, 24); |
d0bcce51 | 17241 | break; |
17242 | case 128: | |
fcbea5e4 | 17243 | mpc_init2(t, 53); |
d0bcce51 | 17244 | break; |
17245 | default: | |
17246 | go_unreachable(); | |
17247 | } | |
fcbea5e4 | 17248 | mpc_set(t, val, MPC_RNDNN); |
17249 | mpc_set(val, t, MPC_RNDNN); | |
17250 | mpc_clear(t); | |
d0bcce51 | 17251 | |
fcbea5e4 | 17252 | this->set_complex(type, val); |
d0bcce51 | 17253 | } |
17254 | ||
fcbea5e4 | 17255 | mpc_clear(val); |
0c77715b | 17256 | |
17257 | return ret; | |
17258 | } | |
17259 | ||
17260 | // Return an Expression for this value. | |
17261 | ||
17262 | Expression* | |
17263 | Numeric_constant::expression(Location loc) const | |
17264 | { | |
17265 | switch (this->classification_) | |
17266 | { | |
17267 | case NC_INT: | |
e67508fa | 17268 | return Expression::make_integer_z(&this->u_.int_val, this->type_, loc); |
0c77715b | 17269 | case NC_RUNE: |
17270 | return Expression::make_character(&this->u_.int_val, this->type_, loc); | |
17271 | case NC_FLOAT: | |
17272 | return Expression::make_float(&this->u_.float_val, this->type_, loc); | |
17273 | case NC_COMPLEX: | |
fcbea5e4 | 17274 | return Expression::make_complex(&this->u_.complex_val, this->type_, loc); |
71a45216 | 17275 | case NC_INVALID: |
17276 | go_assert(saw_errors()); | |
17277 | return Expression::make_error(loc); | |
0c77715b | 17278 | default: |
17279 | go_unreachable(); | |
17280 | } | |
17281 | } | |
0ab32342 | 17282 | |
17283 | // Calculate a hash code with a given seed. | |
17284 | ||
17285 | unsigned int | |
17286 | Numeric_constant::hash(unsigned int seed) const | |
17287 | { | |
17288 | unsigned long val; | |
17289 | const unsigned int PRIME = 97; | |
17290 | long e = 0; | |
17291 | double f = 1.0; | |
17292 | mpfr_t m; | |
17293 | ||
17294 | switch (this->classification_) | |
17295 | { | |
17296 | case NC_INVALID: | |
17297 | return PRIME; | |
17298 | case NC_INT: | |
17299 | case NC_RUNE: | |
17300 | val = mpz_get_ui(this->u_.int_val); | |
17301 | break; | |
17302 | case NC_COMPLEX: | |
17303 | mpfr_init(m); | |
0570cb84 | 17304 | mpc_abs(m, this->u_.complex_val, GMP_RNDN); |
17305 | val = mpfr_get_ui(m, GMP_RNDN); | |
0ab32342 | 17306 | mpfr_clear(m); |
17307 | break; | |
17308 | case NC_FLOAT: | |
29d43984 | 17309 | f = mpfr_get_d_2exp(&e, this->u_.float_val, GMP_RNDN) * 4294967295.0; |
0ab32342 | 17310 | val = static_cast<unsigned long>(e + static_cast<long>(f)); |
17311 | break; | |
17312 | default: | |
17313 | go_unreachable(); | |
17314 | } | |
17315 | ||
17316 | return (static_cast<unsigned int>(val) + seed) * PRIME; | |
17317 | } | |
17318 |