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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; |
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"); | |
1347 | Type* struct_type = Type::make_builtin_struct_type(1, "code", uintptr_type); | |
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(); |
0c77715b | 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(); } |
d751bb78 | 3301 | |
3302 | void | |
3303 | do_dump_expression(Ast_dump_context* ast_dump_context) const | |
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()) |
c484d925 | 3877 | go_assert(t->points_to() != NULL); |
2c809f8f | 3878 | else if (t->interface_type() != NULL) |
9581e91d | 3879 | { |
2c809f8f | 3880 | bool empty_iface = t->interface_type()->is_empty(); |
c484d925 | 3881 | go_assert(et->interface_type() != NULL |
2c809f8f | 3882 | && et->interface_type()->is_empty() == empty_iface); |
9581e91d | 3883 | } |
588e3cf9 | 3884 | else if (t->integer_type() != NULL) |
2c809f8f | 3885 | go_assert(et->is_boolean_type() |
3886 | || et->integer_type() != NULL | |
3887 | || et->function_type() != NULL | |
3888 | || et->points_to() != NULL | |
3889 | || et->map_type() != NULL | |
8ba8cc87 | 3890 | || et->channel_type() != NULL |
3891 | || et->is_nil_type()); | |
cd39797e | 3892 | else if (t->function_type() != NULL) |
3893 | go_assert(et->points_to() != NULL); | |
9581e91d | 3894 | else |
c3e6f413 | 3895 | go_unreachable(); |
9581e91d | 3896 | |
2c809f8f | 3897 | Gogo* gogo = context->gogo(); |
3898 | Btype* btype = t->get_backend(gogo); | |
ea664253 | 3899 | Bexpression* bexpr = this->expr_->get_backend(context); |
2c809f8f | 3900 | Location loc = this->location(); |
ea664253 | 3901 | return gogo->backend()->convert_expression(btype, bexpr, loc); |
9581e91d | 3902 | } |
3903 | ||
d751bb78 | 3904 | // Dump ast representation for an unsafe type conversion expression. |
3905 | ||
3906 | void | |
3907 | Unsafe_type_conversion_expression::do_dump_expression( | |
3908 | Ast_dump_context* ast_dump_context) const | |
3909 | { | |
3910 | ast_dump_context->dump_type(this->type_); | |
3911 | ast_dump_context->ostream() << "("; | |
3912 | ast_dump_context->dump_expression(this->expr_); | |
3913 | ast_dump_context->ostream() << ") "; | |
3914 | } | |
3915 | ||
9581e91d | 3916 | // Make an unsafe type conversion expression. |
3917 | ||
3918 | Expression* | |
3919 | Expression::make_unsafe_cast(Type* type, Expression* expr, | |
b13c66cd | 3920 | Location location) |
9581e91d | 3921 | { |
3922 | return new Unsafe_type_conversion_expression(type, expr, location); | |
3923 | } | |
3924 | ||
76f85fd6 | 3925 | // Class Unary_expression. |
e440a328 | 3926 | |
03118c21 | 3927 | // Call the address_taken method of the operand if needed. This is |
3928 | // called after escape analysis but before inserting write barriers. | |
3929 | ||
3930 | void | |
c1177ba4 | 3931 | Unary_expression::check_operand_address_taken(Gogo*) |
03118c21 | 3932 | { |
3933 | if (this->op_ != OPERATOR_AND) | |
3934 | return; | |
3935 | ||
3936 | // If this->escapes_ is false at this point, then it was set to | |
3937 | // false by an explicit call to set_does_not_escape, and the value | |
3938 | // does not escape. If this->escapes_ is true, we may be able to | |
2f86af0a | 3939 | // set it to false based on the escape analysis pass. |
3940 | if (this->escapes_) | |
3941 | { | |
3942 | Node* n = Node::make_node(this); | |
3943 | if ((n->encoding() & ESCAPE_MASK) == int(Node::ESCAPE_NONE)) | |
3944 | this->escapes_ = false; | |
03118c21 | 3945 | } |
3946 | ||
3947 | this->expr_->address_taken(this->escapes_); | |
3948 | } | |
3949 | ||
e440a328 | 3950 | // If we are taking the address of a composite literal, and the |
2c809f8f | 3951 | // contents are not constant, then we want to make a heap expression |
e440a328 | 3952 | // instead. |
3953 | ||
3954 | Expression* | |
ceeb4318 | 3955 | Unary_expression::do_lower(Gogo*, Named_object*, Statement_inserter*, int) |
e440a328 | 3956 | { |
b13c66cd | 3957 | Location loc = this->location(); |
e440a328 | 3958 | Operator op = this->op_; |
3959 | Expression* expr = this->expr_; | |
3960 | ||
3961 | if (op == OPERATOR_MULT && expr->is_type_expression()) | |
3962 | return Expression::make_type(Type::make_pointer_type(expr->type()), loc); | |
3963 | ||
3964 | // *&x simplifies to x. *(*T)(unsafe.Pointer)(&x) does not require | |
3965 | // moving x to the heap. FIXME: Is it worth doing a real escape | |
3966 | // analysis here? This case is found in math/unsafe.go and is | |
3967 | // therefore worth special casing. | |
3968 | if (op == OPERATOR_MULT) | |
3969 | { | |
3970 | Expression* e = expr; | |
3971 | while (e->classification() == EXPRESSION_CONVERSION) | |
3972 | { | |
3973 | Type_conversion_expression* te | |
3974 | = static_cast<Type_conversion_expression*>(e); | |
3975 | e = te->expr(); | |
3976 | } | |
3977 | ||
3978 | if (e->classification() == EXPRESSION_UNARY) | |
3979 | { | |
3980 | Unary_expression* ue = static_cast<Unary_expression*>(e); | |
3981 | if (ue->op_ == OPERATOR_AND) | |
3982 | { | |
3983 | if (e == expr) | |
3984 | { | |
3985 | // *&x == x. | |
f4dea966 | 3986 | if (!ue->expr_->is_addressable() && !ue->create_temp_) |
3987 | { | |
631d5788 | 3988 | go_error_at(ue->location(), |
3989 | "invalid operand for unary %<&%>"); | |
f4dea966 | 3990 | this->set_is_error(); |
3991 | } | |
e440a328 | 3992 | return ue->expr_; |
3993 | } | |
3994 | ue->set_does_not_escape(); | |
3995 | } | |
3996 | } | |
3997 | } | |
3998 | ||
55661ce9 | 3999 | // Catching an invalid indirection of unsafe.Pointer here avoid |
4000 | // having to deal with TYPE_VOID in other places. | |
4001 | if (op == OPERATOR_MULT && expr->type()->is_unsafe_pointer_type()) | |
4002 | { | |
631d5788 | 4003 | go_error_at(this->location(), "invalid indirect of %<unsafe.Pointer%>"); |
55661ce9 | 4004 | return Expression::make_error(this->location()); |
4005 | } | |
4006 | ||
d9f3743a | 4007 | // Check for an invalid pointer dereference. We need to do this |
4008 | // here because Unary_expression::do_type will return an error type | |
4009 | // in this case. That can cause code to appear erroneous, and | |
4010 | // therefore disappear at lowering time, without any error message. | |
4011 | if (op == OPERATOR_MULT && expr->type()->points_to() == NULL) | |
4012 | { | |
4013 | this->report_error(_("expected pointer")); | |
4014 | return Expression::make_error(this->location()); | |
4015 | } | |
4016 | ||
59a401fe | 4017 | if (op == OPERATOR_PLUS || op == OPERATOR_MINUS || op == OPERATOR_XOR) |
e440a328 | 4018 | { |
0c77715b | 4019 | Numeric_constant nc; |
4020 | if (expr->numeric_constant_value(&nc)) | |
e440a328 | 4021 | { |
0c77715b | 4022 | Numeric_constant result; |
af7a5274 | 4023 | bool issued_error; |
4024 | if (Unary_expression::eval_constant(op, &nc, loc, &result, | |
4025 | &issued_error)) | |
0c77715b | 4026 | return result.expression(loc); |
af7a5274 | 4027 | else if (issued_error) |
4028 | return Expression::make_error(this->location()); | |
e440a328 | 4029 | } |
4030 | } | |
4031 | ||
4032 | return this; | |
4033 | } | |
4034 | ||
f9ca30f9 | 4035 | // Flatten expression if a nil check must be performed and create temporary |
4036 | // variables if necessary. | |
4037 | ||
4038 | Expression* | |
4039 | Unary_expression::do_flatten(Gogo* gogo, Named_object*, | |
4040 | Statement_inserter* inserter) | |
4041 | { | |
5bf8be8b | 4042 | if (this->is_error_expression() |
4043 | || this->expr_->is_error_expression() | |
4044 | || this->expr_->type()->is_error_type()) | |
4045 | { | |
4046 | go_assert(saw_errors()); | |
4047 | return Expression::make_error(this->location()); | |
4048 | } | |
f4dea966 | 4049 | |
f9ca30f9 | 4050 | Location location = this->location(); |
4051 | if (this->op_ == OPERATOR_MULT | |
4052 | && !this->expr_->is_variable()) | |
4053 | { | |
4054 | go_assert(this->expr_->type()->points_to() != NULL); | |
f614ea8b | 4055 | switch (this->requires_nil_check(gogo)) |
f9ca30f9 | 4056 | { |
f614ea8b | 4057 | case NIL_CHECK_ERROR_ENCOUNTERED: |
2a305b85 | 4058 | { |
4059 | go_assert(saw_errors()); | |
4060 | return Expression::make_error(this->location()); | |
4061 | } | |
f614ea8b | 4062 | case NIL_CHECK_NOT_NEEDED: |
4063 | break; | |
4064 | case NIL_CHECK_NEEDED: | |
4065 | this->create_temp_ = true; | |
4066 | break; | |
4067 | case NIL_CHECK_DEFAULT: | |
4068 | go_unreachable(); | |
f9ca30f9 | 4069 | } |
4070 | } | |
4071 | ||
4072 | if (this->create_temp_ && !this->expr_->is_variable()) | |
4073 | { | |
4074 | Temporary_statement* temp = | |
4075 | Statement::make_temporary(NULL, this->expr_, location); | |
4076 | inserter->insert(temp); | |
4077 | this->expr_ = Expression::make_temporary_reference(temp, location); | |
4078 | } | |
4079 | ||
4080 | return this; | |
4081 | } | |
4082 | ||
e440a328 | 4083 | // Return whether a unary expression is a constant. |
4084 | ||
4085 | bool | |
4086 | Unary_expression::do_is_constant() const | |
4087 | { | |
4088 | if (this->op_ == OPERATOR_MULT) | |
4089 | { | |
4090 | // Indirecting through a pointer is only constant if the object | |
4091 | // to which the expression points is constant, but we currently | |
4092 | // have no way to determine that. | |
4093 | return false; | |
4094 | } | |
4095 | else if (this->op_ == OPERATOR_AND) | |
4096 | { | |
4097 | // Taking the address of a variable is constant if it is a | |
f9ca30f9 | 4098 | // global variable, not constant otherwise. In other cases taking the |
4099 | // address is probably not a constant. | |
e440a328 | 4100 | Var_expression* ve = this->expr_->var_expression(); |
4101 | if (ve != NULL) | |
4102 | { | |
4103 | Named_object* no = ve->named_object(); | |
4104 | return no->is_variable() && no->var_value()->is_global(); | |
4105 | } | |
4106 | return false; | |
4107 | } | |
4108 | else | |
4109 | return this->expr_->is_constant(); | |
4110 | } | |
4111 | ||
3ae06f68 | 4112 | // Return whether a unary expression can be used as a constant |
4113 | // initializer. | |
4114 | ||
4115 | bool | |
4116 | Unary_expression::do_is_static_initializer() const | |
4117 | { | |
4118 | if (this->op_ == OPERATOR_MULT) | |
4119 | return false; | |
4120 | else if (this->op_ == OPERATOR_AND) | |
de048538 | 4121 | return Unary_expression::base_is_static_initializer(this->expr_); |
4122 | else | |
4123 | return this->expr_->is_static_initializer(); | |
4124 | } | |
3ae06f68 | 4125 | |
de048538 | 4126 | // Return whether the address of EXPR can be used as a static |
4127 | // initializer. | |
3ae06f68 | 4128 | |
de048538 | 4129 | bool |
4130 | Unary_expression::base_is_static_initializer(Expression* expr) | |
4131 | { | |
4132 | // The address of a field reference can be a static initializer if | |
4133 | // the base can be a static initializer. | |
4134 | Field_reference_expression* fre = expr->field_reference_expression(); | |
4135 | if (fre != NULL) | |
4136 | return Unary_expression::base_is_static_initializer(fre->expr()); | |
4137 | ||
4138 | // The address of an index expression can be a static initializer if | |
4139 | // the base can be a static initializer and the index is constant. | |
4140 | Array_index_expression* aind = expr->array_index_expression(); | |
4141 | if (aind != NULL) | |
4142 | return (aind->end() == NULL | |
4143 | && aind->start()->is_constant() | |
4144 | && Unary_expression::base_is_static_initializer(aind->array())); | |
4145 | ||
4146 | // The address of a global variable can be a static initializer. | |
4147 | Var_expression* ve = expr->var_expression(); | |
4148 | if (ve != NULL) | |
4149 | { | |
4150 | Named_object* no = ve->named_object(); | |
4151 | return no->is_variable() && no->var_value()->is_global(); | |
4152 | } | |
4153 | ||
4154 | // The address of a composite literal can be used as a static | |
4155 | // initializer if the composite literal is itself usable as a | |
4156 | // static initializer. | |
4157 | if (expr->is_composite_literal() && expr->is_static_initializer()) | |
4158 | return true; | |
3ae06f68 | 4159 | |
de048538 | 4160 | // The address of a string constant can be used as a static |
4161 | // initializer. This can not be written in Go itself but this is | |
4162 | // used when building a type descriptor. | |
4163 | if (expr->string_expression() != NULL) | |
4164 | return true; | |
4165 | ||
4166 | return false; | |
3ae06f68 | 4167 | } |
4168 | ||
f614ea8b | 4169 | // Return whether this dereference expression requires an explicit nil |
4170 | // check. If we are dereferencing the pointer to a large struct | |
4171 | // (greater than the specified size threshold), we need to check for | |
4172 | // nil. We don't bother to check for small structs because we expect | |
4173 | // the system to crash on a nil pointer dereference. However, if we | |
4174 | // know the address of this expression is being taken, we must always | |
4175 | // check for nil. | |
4176 | Unary_expression::Nil_check_classification | |
4177 | Unary_expression::requires_nil_check(Gogo* gogo) | |
4178 | { | |
4179 | go_assert(this->op_ == OPERATOR_MULT); | |
4180 | go_assert(this->expr_->type()->points_to() != NULL); | |
4181 | ||
4182 | if (this->issue_nil_check_ == NIL_CHECK_NEEDED) | |
4183 | return NIL_CHECK_NEEDED; | |
4184 | else if (this->issue_nil_check_ == NIL_CHECK_NOT_NEEDED) | |
4185 | return NIL_CHECK_NOT_NEEDED; | |
4186 | ||
4187 | Type* ptype = this->expr_->type()->points_to(); | |
4188 | int64_t type_size = -1; | |
4189 | if (!ptype->is_void_type()) | |
4190 | { | |
4191 | bool ok = ptype->backend_type_size(gogo, &type_size); | |
4192 | if (!ok) | |
4193 | return NIL_CHECK_ERROR_ENCOUNTERED; | |
4194 | } | |
4195 | ||
4196 | int64_t size_cutoff = gogo->nil_check_size_threshold(); | |
4197 | if (size_cutoff == -1 || (type_size != -1 && type_size >= size_cutoff)) | |
4198 | this->issue_nil_check_ = NIL_CHECK_NEEDED; | |
4199 | else | |
4200 | this->issue_nil_check_ = NIL_CHECK_NOT_NEEDED; | |
4201 | return this->issue_nil_check_; | |
4202 | } | |
4203 | ||
0c77715b | 4204 | // Apply unary opcode OP to UNC, setting NC. Return true if this |
af7a5274 | 4205 | // could be done, false if not. On overflow, issues an error and sets |
4206 | // *ISSUED_ERROR. | |
e440a328 | 4207 | |
4208 | bool | |
0c77715b | 4209 | Unary_expression::eval_constant(Operator op, const Numeric_constant* unc, |
af7a5274 | 4210 | Location location, Numeric_constant* nc, |
4211 | bool* issued_error) | |
e440a328 | 4212 | { |
af7a5274 | 4213 | *issued_error = false; |
e440a328 | 4214 | switch (op) |
4215 | { | |
4216 | case OPERATOR_PLUS: | |
0c77715b | 4217 | *nc = *unc; |
e440a328 | 4218 | return true; |
0c77715b | 4219 | |
e440a328 | 4220 | case OPERATOR_MINUS: |
0c77715b | 4221 | if (unc->is_int() || unc->is_rune()) |
4222 | break; | |
4223 | else if (unc->is_float()) | |
4224 | { | |
4225 | mpfr_t uval; | |
4226 | unc->get_float(&uval); | |
4227 | mpfr_t val; | |
4228 | mpfr_init(val); | |
4229 | mpfr_neg(val, uval, GMP_RNDN); | |
4230 | nc->set_float(unc->type(), val); | |
4231 | mpfr_clear(uval); | |
4232 | mpfr_clear(val); | |
4233 | return true; | |
4234 | } | |
4235 | else if (unc->is_complex()) | |
4236 | { | |
fcbea5e4 | 4237 | mpc_t uval; |
4238 | unc->get_complex(&uval); | |
4239 | mpc_t val; | |
4240 | mpc_init2(val, mpc_precision); | |
4241 | mpc_neg(val, uval, MPC_RNDNN); | |
4242 | nc->set_complex(unc->type(), val); | |
4243 | mpc_clear(uval); | |
4244 | mpc_clear(val); | |
0c77715b | 4245 | return true; |
4246 | } | |
e440a328 | 4247 | else |
0c77715b | 4248 | go_unreachable(); |
e440a328 | 4249 | |
0c77715b | 4250 | case OPERATOR_XOR: |
4251 | break; | |
68448d53 | 4252 | |
59a401fe | 4253 | case OPERATOR_NOT: |
e440a328 | 4254 | case OPERATOR_AND: |
4255 | case OPERATOR_MULT: | |
4256 | return false; | |
0c77715b | 4257 | |
e440a328 | 4258 | default: |
c3e6f413 | 4259 | go_unreachable(); |
e440a328 | 4260 | } |
e440a328 | 4261 | |
0c77715b | 4262 | if (!unc->is_int() && !unc->is_rune()) |
4263 | return false; | |
4264 | ||
4265 | mpz_t uval; | |
8387e1df | 4266 | if (unc->is_rune()) |
4267 | unc->get_rune(&uval); | |
4268 | else | |
4269 | unc->get_int(&uval); | |
0c77715b | 4270 | mpz_t val; |
4271 | mpz_init(val); | |
e440a328 | 4272 | |
e440a328 | 4273 | switch (op) |
4274 | { | |
e440a328 | 4275 | case OPERATOR_MINUS: |
0c77715b | 4276 | mpz_neg(val, uval); |
4277 | break; | |
4278 | ||
e440a328 | 4279 | case OPERATOR_NOT: |
0c77715b | 4280 | mpz_set_ui(val, mpz_cmp_si(uval, 0) == 0 ? 1 : 0); |
4281 | break; | |
4282 | ||
e440a328 | 4283 | case OPERATOR_XOR: |
0c77715b | 4284 | { |
4285 | Type* utype = unc->type(); | |
4286 | if (utype->integer_type() == NULL | |
4287 | || utype->integer_type()->is_abstract()) | |
4288 | mpz_com(val, uval); | |
4289 | else | |
4290 | { | |
4291 | // The number of HOST_WIDE_INTs that it takes to represent | |
4292 | // UVAL. | |
4293 | size_t count = ((mpz_sizeinbase(uval, 2) | |
4294 | + HOST_BITS_PER_WIDE_INT | |
4295 | - 1) | |
4296 | / HOST_BITS_PER_WIDE_INT); | |
e440a328 | 4297 | |
0c77715b | 4298 | unsigned HOST_WIDE_INT* phwi = new unsigned HOST_WIDE_INT[count]; |
4299 | memset(phwi, 0, count * sizeof(HOST_WIDE_INT)); | |
4300 | ||
4301 | size_t obits = utype->integer_type()->bits(); | |
4302 | ||
4303 | if (!utype->integer_type()->is_unsigned() && mpz_sgn(uval) < 0) | |
4304 | { | |
4305 | mpz_t adj; | |
4306 | mpz_init_set_ui(adj, 1); | |
4307 | mpz_mul_2exp(adj, adj, obits); | |
4308 | mpz_add(uval, uval, adj); | |
4309 | mpz_clear(adj); | |
4310 | } | |
4311 | ||
4312 | size_t ecount; | |
4313 | mpz_export(phwi, &ecount, -1, sizeof(HOST_WIDE_INT), 0, 0, uval); | |
4314 | go_assert(ecount <= count); | |
4315 | ||
4316 | // Trim down to the number of words required by the type. | |
4317 | size_t ocount = ((obits + HOST_BITS_PER_WIDE_INT - 1) | |
4318 | / HOST_BITS_PER_WIDE_INT); | |
4319 | go_assert(ocount <= count); | |
4320 | ||
4321 | for (size_t i = 0; i < ocount; ++i) | |
4322 | phwi[i] = ~phwi[i]; | |
4323 | ||
4324 | size_t clearbits = ocount * HOST_BITS_PER_WIDE_INT - obits; | |
4325 | if (clearbits != 0) | |
4326 | phwi[ocount - 1] &= (((unsigned HOST_WIDE_INT) (HOST_WIDE_INT) -1) | |
4327 | >> clearbits); | |
4328 | ||
4329 | mpz_import(val, ocount, -1, sizeof(HOST_WIDE_INT), 0, 0, phwi); | |
4330 | ||
4331 | if (!utype->integer_type()->is_unsigned() | |
4332 | && mpz_tstbit(val, obits - 1)) | |
4333 | { | |
4334 | mpz_t adj; | |
4335 | mpz_init_set_ui(adj, 1); | |
4336 | mpz_mul_2exp(adj, adj, obits); | |
4337 | mpz_sub(val, val, adj); | |
4338 | mpz_clear(adj); | |
4339 | } | |
4340 | ||
4341 | delete[] phwi; | |
4342 | } | |
4343 | } | |
4344 | break; | |
e440a328 | 4345 | |
e440a328 | 4346 | default: |
c3e6f413 | 4347 | go_unreachable(); |
e440a328 | 4348 | } |
e440a328 | 4349 | |
0c77715b | 4350 | if (unc->is_rune()) |
4351 | nc->set_rune(NULL, val); | |
e440a328 | 4352 | else |
0c77715b | 4353 | nc->set_int(NULL, val); |
e440a328 | 4354 | |
0c77715b | 4355 | mpz_clear(uval); |
4356 | mpz_clear(val); | |
e440a328 | 4357 | |
af7a5274 | 4358 | if (!nc->set_type(unc->type(), true, location)) |
4359 | { | |
4360 | *issued_error = true; | |
4361 | return false; | |
4362 | } | |
4363 | return true; | |
e440a328 | 4364 | } |
4365 | ||
0c77715b | 4366 | // Return the integral constant value of a unary expression, if it has one. |
e440a328 | 4367 | |
4368 | bool | |
0c77715b | 4369 | Unary_expression::do_numeric_constant_value(Numeric_constant* nc) const |
e440a328 | 4370 | { |
0c77715b | 4371 | Numeric_constant unc; |
4372 | if (!this->expr_->numeric_constant_value(&unc)) | |
4373 | return false; | |
af7a5274 | 4374 | bool issued_error; |
0c77715b | 4375 | return Unary_expression::eval_constant(this->op_, &unc, this->location(), |
af7a5274 | 4376 | nc, &issued_error); |
e440a328 | 4377 | } |
4378 | ||
4379 | // Return the type of a unary expression. | |
4380 | ||
4381 | Type* | |
4382 | Unary_expression::do_type() | |
4383 | { | |
4384 | switch (this->op_) | |
4385 | { | |
4386 | case OPERATOR_PLUS: | |
4387 | case OPERATOR_MINUS: | |
4388 | case OPERATOR_NOT: | |
4389 | case OPERATOR_XOR: | |
4390 | return this->expr_->type(); | |
4391 | ||
4392 | case OPERATOR_AND: | |
4393 | return Type::make_pointer_type(this->expr_->type()); | |
4394 | ||
4395 | case OPERATOR_MULT: | |
4396 | { | |
4397 | Type* subtype = this->expr_->type(); | |
4398 | Type* points_to = subtype->points_to(); | |
4399 | if (points_to == NULL) | |
4400 | return Type::make_error_type(); | |
4401 | return points_to; | |
4402 | } | |
4403 | ||
4404 | default: | |
c3e6f413 | 4405 | go_unreachable(); |
e440a328 | 4406 | } |
4407 | } | |
4408 | ||
4409 | // Determine abstract types for a unary expression. | |
4410 | ||
4411 | void | |
4412 | Unary_expression::do_determine_type(const Type_context* context) | |
4413 | { | |
4414 | switch (this->op_) | |
4415 | { | |
4416 | case OPERATOR_PLUS: | |
4417 | case OPERATOR_MINUS: | |
4418 | case OPERATOR_NOT: | |
4419 | case OPERATOR_XOR: | |
4420 | this->expr_->determine_type(context); | |
4421 | break; | |
4422 | ||
4423 | case OPERATOR_AND: | |
4424 | // Taking the address of something. | |
4425 | { | |
4426 | Type* subtype = (context->type == NULL | |
4427 | ? NULL | |
4428 | : context->type->points_to()); | |
4429 | Type_context subcontext(subtype, false); | |
4430 | this->expr_->determine_type(&subcontext); | |
4431 | } | |
4432 | break; | |
4433 | ||
4434 | case OPERATOR_MULT: | |
4435 | // Indirecting through a pointer. | |
4436 | { | |
4437 | Type* subtype = (context->type == NULL | |
4438 | ? NULL | |
4439 | : Type::make_pointer_type(context->type)); | |
4440 | Type_context subcontext(subtype, false); | |
4441 | this->expr_->determine_type(&subcontext); | |
4442 | } | |
4443 | break; | |
4444 | ||
4445 | default: | |
c3e6f413 | 4446 | go_unreachable(); |
e440a328 | 4447 | } |
4448 | } | |
4449 | ||
4450 | // Check types for a unary expression. | |
4451 | ||
4452 | void | |
4453 | Unary_expression::do_check_types(Gogo*) | |
4454 | { | |
9fe897ef | 4455 | Type* type = this->expr_->type(); |
5c13bd80 | 4456 | if (type->is_error()) |
9fe897ef | 4457 | { |
4458 | this->set_is_error(); | |
4459 | return; | |
4460 | } | |
4461 | ||
e440a328 | 4462 | switch (this->op_) |
4463 | { | |
4464 | case OPERATOR_PLUS: | |
4465 | case OPERATOR_MINUS: | |
9fe897ef | 4466 | if (type->integer_type() == NULL |
4467 | && type->float_type() == NULL | |
4468 | && type->complex_type() == NULL) | |
4469 | this->report_error(_("expected numeric type")); | |
e440a328 | 4470 | break; |
4471 | ||
4472 | case OPERATOR_NOT: | |
59a401fe | 4473 | if (!type->is_boolean_type()) |
4474 | this->report_error(_("expected boolean type")); | |
4475 | break; | |
4476 | ||
e440a328 | 4477 | case OPERATOR_XOR: |
b3b1474e | 4478 | if (type->integer_type() == NULL) |
4479 | this->report_error(_("expected integer")); | |
e440a328 | 4480 | break; |
4481 | ||
4482 | case OPERATOR_AND: | |
4483 | if (!this->expr_->is_addressable()) | |
09ea332d | 4484 | { |
4485 | if (!this->create_temp_) | |
f4dea966 | 4486 | { |
631d5788 | 4487 | go_error_at(this->location(), "invalid operand for unary %<&%>"); |
f4dea966 | 4488 | this->set_is_error(); |
4489 | } | |
09ea332d | 4490 | } |
e440a328 | 4491 | else |
da244e59 | 4492 | this->expr_->issue_nil_check(); |
e440a328 | 4493 | break; |
4494 | ||
4495 | case OPERATOR_MULT: | |
4496 | // Indirecting through a pointer. | |
9fe897ef | 4497 | if (type->points_to() == NULL) |
4498 | this->report_error(_("expected pointer")); | |
7661d702 | 4499 | if (type->points_to()->is_error()) |
4500 | this->set_is_error(); | |
e440a328 | 4501 | break; |
4502 | ||
4503 | default: | |
c3e6f413 | 4504 | go_unreachable(); |
e440a328 | 4505 | } |
4506 | } | |
4507 | ||
ea664253 | 4508 | // Get the backend representation for a unary expression. |
e440a328 | 4509 | |
ea664253 | 4510 | Bexpression* |
4511 | Unary_expression::do_get_backend(Translate_context* context) | |
e440a328 | 4512 | { |
1b1f2abf | 4513 | Gogo* gogo = context->gogo(); |
e9d3367e | 4514 | Location loc = this->location(); |
4515 | ||
4516 | // Taking the address of a set-and-use-temporary expression requires | |
4517 | // setting the temporary and then taking the address. | |
4518 | if (this->op_ == OPERATOR_AND) | |
4519 | { | |
4520 | Set_and_use_temporary_expression* sut = | |
4521 | this->expr_->set_and_use_temporary_expression(); | |
4522 | if (sut != NULL) | |
4523 | { | |
4524 | Temporary_statement* temp = sut->temporary(); | |
4525 | Bvariable* bvar = temp->get_backend_variable(context); | |
d4e6573e | 4526 | Bexpression* bvar_expr = |
7af8e400 | 4527 | gogo->backend()->var_expression(bvar, loc); |
ea664253 | 4528 | Bexpression* bval = sut->expression()->get_backend(context); |
f9ca30f9 | 4529 | |
0ab48656 | 4530 | Named_object* fn = context->function(); |
4531 | go_assert(fn != NULL); | |
4532 | Bfunction* bfn = | |
4533 | fn->func_value()->get_or_make_decl(gogo, fn); | |
f9ca30f9 | 4534 | Bstatement* bassign = |
0ab48656 | 4535 | gogo->backend()->assignment_statement(bfn, bvar_expr, bval, loc); |
f9ca30f9 | 4536 | Bexpression* bvar_addr = |
4537 | gogo->backend()->address_expression(bvar_expr, loc); | |
ea664253 | 4538 | return gogo->backend()->compound_expression(bassign, bvar_addr, loc); |
e9d3367e | 4539 | } |
4540 | } | |
4541 | ||
f9ca30f9 | 4542 | Bexpression* ret; |
ea664253 | 4543 | Bexpression* bexpr = this->expr_->get_backend(context); |
f9ca30f9 | 4544 | Btype* btype = this->expr_->type()->get_backend(gogo); |
e440a328 | 4545 | switch (this->op_) |
4546 | { | |
4547 | case OPERATOR_PLUS: | |
f9ca30f9 | 4548 | ret = bexpr; |
4549 | break; | |
e440a328 | 4550 | |
4551 | case OPERATOR_MINUS: | |
f9ca30f9 | 4552 | ret = gogo->backend()->unary_expression(this->op_, bexpr, loc); |
4553 | ret = gogo->backend()->convert_expression(btype, ret, loc); | |
4554 | break; | |
e440a328 | 4555 | |
4556 | case OPERATOR_NOT: | |
e440a328 | 4557 | case OPERATOR_XOR: |
f9ca30f9 | 4558 | ret = gogo->backend()->unary_expression(this->op_, bexpr, loc); |
4559 | break; | |
e440a328 | 4560 | |
4561 | case OPERATOR_AND: | |
09ea332d | 4562 | if (!this->create_temp_) |
4563 | { | |
4564 | // We should not see a non-constant constructor here; cases | |
4565 | // where we would see one should have been moved onto the | |
4566 | // heap at parse time. Taking the address of a nonconstant | |
4567 | // constructor will not do what the programmer expects. | |
f9ca30f9 | 4568 | |
4569 | go_assert(!this->expr_->is_composite_literal() | |
3ae06f68 | 4570 | || this->expr_->is_static_initializer()); |
24060bf9 | 4571 | if (this->expr_->classification() == EXPRESSION_UNARY) |
4572 | { | |
4573 | Unary_expression* ue = | |
4574 | static_cast<Unary_expression*>(this->expr_); | |
4575 | go_assert(ue->op() != OPERATOR_AND); | |
4576 | } | |
09ea332d | 4577 | } |
e440a328 | 4578 | |
f23d7786 | 4579 | if (this->is_gc_root_ || this->is_slice_init_) |
76f85fd6 | 4580 | { |
19272321 | 4581 | std::string var_name; |
f23d7786 | 4582 | bool copy_to_heap = false; |
4583 | if (this->is_gc_root_) | |
4584 | { | |
4585 | // Build a decl for a GC root variable. GC roots are mutable, so | |
4586 | // they cannot be represented as an immutable_struct in the | |
4587 | // backend. | |
19272321 | 4588 | var_name = gogo->gc_root_name(); |
f23d7786 | 4589 | } |
4590 | else | |
4591 | { | |
4592 | // Build a decl for a slice value initializer. An immutable slice | |
4593 | // value initializer may have to be copied to the heap if it | |
4594 | // contains pointers in a non-constant context. | |
19272321 | 4595 | var_name = gogo->initializer_name(); |
f23d7786 | 4596 | |
4597 | Array_type* at = this->expr_->type()->array_type(); | |
4598 | go_assert(at != NULL); | |
4599 | ||
4600 | // If we are not copying the value to the heap, we will only | |
4601 | // initialize the value once, so we can use this directly | |
4602 | // rather than copying it. In that case we can't make it | |
4603 | // read-only, because the program is permitted to change it. | |
ee200713 | 4604 | copy_to_heap = (context->function() != NULL |
4605 | || context->is_const()); | |
f23d7786 | 4606 | } |
19272321 | 4607 | std::string asm_name(go_selectively_encode_id(var_name)); |
f23d7786 | 4608 | Bvariable* implicit = |
19272321 | 4609 | gogo->backend()->implicit_variable(var_name, asm_name, |
438b4bec | 4610 | btype, true, copy_to_heap, |
4611 | false, 0); | |
19272321 | 4612 | gogo->backend()->implicit_variable_set_init(implicit, var_name, btype, |
aa5ae575 | 4613 | true, copy_to_heap, false, |
4614 | bexpr); | |
7af8e400 | 4615 | bexpr = gogo->backend()->var_expression(implicit, loc); |
1b4fb1e0 | 4616 | |
4617 | // If we are not copying a slice initializer to the heap, | |
4618 | // then it can be changed by the program, so if it can | |
4619 | // contain pointers we must register it as a GC root. | |
4620 | if (this->is_slice_init_ | |
4621 | && !copy_to_heap | |
4622 | && this->expr_->type()->has_pointer()) | |
4623 | { | |
4624 | Bexpression* root = | |
7af8e400 | 4625 | gogo->backend()->var_expression(implicit, loc); |
1b4fb1e0 | 4626 | root = gogo->backend()->address_expression(root, loc); |
4627 | Type* type = Type::make_pointer_type(this->expr_->type()); | |
4628 | gogo->add_gc_root(Expression::make_backend(root, type, loc)); | |
4629 | } | |
76f85fd6 | 4630 | } |
4631 | else if ((this->expr_->is_composite_literal() | |
3ae06f68 | 4632 | || this->expr_->string_expression() != NULL) |
4633 | && this->expr_->is_static_initializer()) | |
f9ca30f9 | 4634 | { |
19272321 | 4635 | std::string var_name(gogo->initializer_name()); |
4636 | std::string asm_name(go_selectively_encode_id(var_name)); | |
f9ca30f9 | 4637 | Bvariable* decl = |
19272321 | 4638 | gogo->backend()->immutable_struct(var_name, asm_name, |
438b4bec | 4639 | true, false, btype, loc); |
19272321 | 4640 | gogo->backend()->immutable_struct_set_init(decl, var_name, true, |
4641 | false, btype, loc, bexpr); | |
7af8e400 | 4642 | bexpr = gogo->backend()->var_expression(decl, loc); |
f9ca30f9 | 4643 | } |
09ea332d | 4644 | |
f9ca30f9 | 4645 | go_assert(!this->create_temp_ || this->expr_->is_variable()); |
4646 | ret = gogo->backend()->address_expression(bexpr, loc); | |
4647 | break; | |
e440a328 | 4648 | |
4649 | case OPERATOR_MULT: | |
4650 | { | |
f9ca30f9 | 4651 | go_assert(this->expr_->type()->points_to() != NULL); |
e440a328 | 4652 | |
f614ea8b | 4653 | bool known_valid = false; |
f9ca30f9 | 4654 | Type* ptype = this->expr_->type()->points_to(); |
4655 | Btype* pbtype = ptype->get_backend(gogo); | |
f614ea8b | 4656 | switch (this->requires_nil_check(gogo)) |
4657 | { | |
4658 | case NIL_CHECK_NOT_NEEDED: | |
4659 | break; | |
4660 | case NIL_CHECK_ERROR_ENCOUNTERED: | |
2a305b85 | 4661 | { |
4662 | go_assert(saw_errors()); | |
4663 | return gogo->backend()->error_expression(); | |
4664 | } | |
f614ea8b | 4665 | case NIL_CHECK_NEEDED: |
4666 | { | |
f9ca30f9 | 4667 | go_assert(this->expr_->is_variable()); |
2dd89704 | 4668 | |
4669 | // If we're nil-checking the result of a set-and-use-temporary | |
4670 | // expression, then pick out the target temp and use that | |
4671 | // for the final result of the conditional. | |
4672 | Bexpression* tbexpr = bexpr; | |
4673 | Bexpression* ubexpr = bexpr; | |
4674 | Set_and_use_temporary_expression* sut = | |
4675 | this->expr_->set_and_use_temporary_expression(); | |
4676 | if (sut != NULL) { | |
4677 | Temporary_statement* temp = sut->temporary(); | |
4678 | Bvariable* bvar = temp->get_backend_variable(context); | |
4679 | ubexpr = gogo->backend()->var_expression(bvar, loc); | |
4680 | } | |
ea664253 | 4681 | Bexpression* nil = |
f614ea8b | 4682 | Expression::make_nil(loc)->get_backend(context); |
f9ca30f9 | 4683 | Bexpression* compare = |
2dd89704 | 4684 | gogo->backend()->binary_expression(OPERATOR_EQEQ, tbexpr, |
f9ca30f9 | 4685 | nil, loc); |
f9ca30f9 | 4686 | Bexpression* crash = |
f614ea8b | 4687 | gogo->runtime_error(RUNTIME_ERROR_NIL_DEREFERENCE, |
4688 | loc)->get_backend(context); | |
93715b75 | 4689 | Bfunction* bfn = context->function()->func_value()->get_decl(); |
4690 | bexpr = gogo->backend()->conditional_expression(bfn, btype, | |
4691 | compare, | |
2dd89704 | 4692 | crash, ubexpr, |
f9ca30f9 | 4693 | loc); |
f614ea8b | 4694 | known_valid = true; |
4695 | break; | |
4696 | } | |
4697 | case NIL_CHECK_DEFAULT: | |
4698 | go_unreachable(); | |
4699 | } | |
4700 | ret = gogo->backend()->indirect_expression(pbtype, bexpr, | |
4701 | known_valid, loc); | |
e440a328 | 4702 | } |
f9ca30f9 | 4703 | break; |
e440a328 | 4704 | |
4705 | default: | |
c3e6f413 | 4706 | go_unreachable(); |
e440a328 | 4707 | } |
f9ca30f9 | 4708 | |
ea664253 | 4709 | return ret; |
e440a328 | 4710 | } |
4711 | ||
4712 | // Export a unary expression. | |
4713 | ||
4714 | void | |
548be246 | 4715 | Unary_expression::do_export(Export_function_body* efb) const |
e440a328 | 4716 | { |
4717 | switch (this->op_) | |
4718 | { | |
4719 | case OPERATOR_PLUS: | |
204d4af4 | 4720 | efb->write_c_string("+"); |
e440a328 | 4721 | break; |
4722 | case OPERATOR_MINUS: | |
204d4af4 | 4723 | efb->write_c_string("-"); |
e440a328 | 4724 | break; |
4725 | case OPERATOR_NOT: | |
204d4af4 | 4726 | efb->write_c_string("!"); |
e440a328 | 4727 | break; |
4728 | case OPERATOR_XOR: | |
204d4af4 | 4729 | efb->write_c_string("^"); |
e440a328 | 4730 | break; |
4731 | case OPERATOR_AND: | |
5f6f5357 | 4732 | efb->write_c_string("&"); |
4733 | break; | |
e440a328 | 4734 | case OPERATOR_MULT: |
5f6f5357 | 4735 | efb->write_c_string("*"); |
4736 | break; | |
e440a328 | 4737 | default: |
c3e6f413 | 4738 | go_unreachable(); |
e440a328 | 4739 | } |
548be246 | 4740 | this->expr_->export_expression(efb); |
e440a328 | 4741 | } |
4742 | ||
4743 | // Import a unary expression. | |
4744 | ||
4745 | Expression* | |
bc8e2ef4 | 4746 | Unary_expression::do_import(Import_expression* imp, Location loc) |
e440a328 | 4747 | { |
4748 | Operator op; | |
4749 | switch (imp->get_char()) | |
4750 | { | |
4751 | case '+': | |
4752 | op = OPERATOR_PLUS; | |
4753 | break; | |
4754 | case '-': | |
4755 | op = OPERATOR_MINUS; | |
4756 | break; | |
4757 | case '!': | |
4758 | op = OPERATOR_NOT; | |
4759 | break; | |
4760 | case '^': | |
4761 | op = OPERATOR_XOR; | |
4762 | break; | |
5f6f5357 | 4763 | case '&': |
4764 | op = OPERATOR_AND; | |
4765 | break; | |
4766 | case '*': | |
4767 | op = OPERATOR_MULT; | |
4768 | break; | |
e440a328 | 4769 | default: |
c3e6f413 | 4770 | go_unreachable(); |
e440a328 | 4771 | } |
204d4af4 | 4772 | if (imp->version() < EXPORT_FORMAT_V3) |
4773 | imp->require_c_string(" "); | |
9b92780c | 4774 | Expression* expr = Expression::import_expression(imp, loc); |
4775 | return Expression::make_unary(op, expr, loc); | |
e440a328 | 4776 | } |
4777 | ||
d751bb78 | 4778 | // Dump ast representation of an unary expression. |
4779 | ||
4780 | void | |
4781 | Unary_expression::do_dump_expression(Ast_dump_context* ast_dump_context) const | |
4782 | { | |
4783 | ast_dump_context->dump_operator(this->op_); | |
4784 | ast_dump_context->ostream() << "("; | |
4785 | ast_dump_context->dump_expression(this->expr_); | |
4786 | ast_dump_context->ostream() << ") "; | |
4787 | } | |
4788 | ||
e440a328 | 4789 | // Make a unary expression. |
4790 | ||
4791 | Expression* | |
b13c66cd | 4792 | Expression::make_unary(Operator op, Expression* expr, Location location) |
e440a328 | 4793 | { |
4794 | return new Unary_expression(op, expr, location); | |
4795 | } | |
4796 | ||
f614ea8b | 4797 | Expression* |
4798 | Expression::make_dereference(Expression* ptr, | |
4799 | Nil_check_classification docheck, | |
4800 | Location location) | |
4801 | { | |
4802 | Expression* deref = Expression::make_unary(OPERATOR_MULT, ptr, location); | |
4803 | if (docheck == NIL_CHECK_NEEDED) | |
4804 | deref->unary_expression()->set_requires_nil_check(true); | |
4805 | else if (docheck == NIL_CHECK_NOT_NEEDED) | |
4806 | deref->unary_expression()->set_requires_nil_check(false); | |
4807 | return deref; | |
4808 | } | |
4809 | ||
e440a328 | 4810 | // If this is an indirection through a pointer, return the expression |
4811 | // being pointed through. Otherwise return this. | |
4812 | ||
4813 | Expression* | |
4814 | Expression::deref() | |
4815 | { | |
4816 | if (this->classification_ == EXPRESSION_UNARY) | |
4817 | { | |
4818 | Unary_expression* ue = static_cast<Unary_expression*>(this); | |
4819 | if (ue->op() == OPERATOR_MULT) | |
4820 | return ue->operand(); | |
4821 | } | |
4822 | return this; | |
4823 | } | |
4824 | ||
4825 | // Class Binary_expression. | |
4826 | ||
4827 | // Traversal. | |
4828 | ||
4829 | int | |
4830 | Binary_expression::do_traverse(Traverse* traverse) | |
4831 | { | |
4832 | int t = Expression::traverse(&this->left_, traverse); | |
4833 | if (t == TRAVERSE_EXIT) | |
4834 | return TRAVERSE_EXIT; | |
4835 | return Expression::traverse(&this->right_, traverse); | |
4836 | } | |
4837 | ||
3ae06f68 | 4838 | // Return whether this expression may be used as a static initializer. |
4839 | ||
4840 | bool | |
4841 | Binary_expression::do_is_static_initializer() const | |
4842 | { | |
4843 | if (!this->left_->is_static_initializer() | |
4844 | || !this->right_->is_static_initializer()) | |
4845 | return false; | |
4846 | ||
4847 | // Addresses can be static initializers, but we can't implement | |
4848 | // arbitray binary expressions of them. | |
4849 | Unary_expression* lu = this->left_->unary_expression(); | |
4850 | Unary_expression* ru = this->right_->unary_expression(); | |
4851 | if (lu != NULL && lu->op() == OPERATOR_AND) | |
4852 | { | |
4853 | if (ru != NULL && ru->op() == OPERATOR_AND) | |
4854 | return this->op_ == OPERATOR_MINUS; | |
4855 | else | |
4856 | return this->op_ == OPERATOR_PLUS || this->op_ == OPERATOR_MINUS; | |
4857 | } | |
4858 | else if (ru != NULL && ru->op() == OPERATOR_AND) | |
4859 | return this->op_ == OPERATOR_PLUS || this->op_ == OPERATOR_MINUS; | |
4860 | ||
4861 | // Other cases should resolve in the backend. | |
4862 | return true; | |
4863 | } | |
4864 | ||
0c77715b | 4865 | // Return the type to use for a binary operation on operands of |
4866 | // LEFT_TYPE and RIGHT_TYPE. These are the types of constants and as | |
4867 | // such may be NULL or abstract. | |
4868 | ||
4869 | bool | |
4870 | Binary_expression::operation_type(Operator op, Type* left_type, | |
4871 | Type* right_type, Type** result_type) | |
4872 | { | |
4873 | if (left_type != right_type | |
4874 | && !left_type->is_abstract() | |
4875 | && !right_type->is_abstract() | |
4876 | && left_type->base() != right_type->base() | |
4877 | && op != OPERATOR_LSHIFT | |
4878 | && op != OPERATOR_RSHIFT) | |
4879 | { | |
4880 | // May be a type error--let it be diagnosed elsewhere. | |
4881 | return false; | |
4882 | } | |
4883 | ||
4884 | if (op == OPERATOR_LSHIFT || op == OPERATOR_RSHIFT) | |
4885 | { | |
4886 | if (left_type->integer_type() != NULL) | |
4887 | *result_type = left_type; | |
4888 | else | |
4889 | *result_type = Type::make_abstract_integer_type(); | |
4890 | } | |
4891 | else if (!left_type->is_abstract() && left_type->named_type() != NULL) | |
4892 | *result_type = left_type; | |
4893 | else if (!right_type->is_abstract() && right_type->named_type() != NULL) | |
4894 | *result_type = right_type; | |
4895 | else if (!left_type->is_abstract()) | |
4896 | *result_type = left_type; | |
4897 | else if (!right_type->is_abstract()) | |
4898 | *result_type = right_type; | |
4899 | else if (left_type->complex_type() != NULL) | |
4900 | *result_type = left_type; | |
4901 | else if (right_type->complex_type() != NULL) | |
4902 | *result_type = right_type; | |
4903 | else if (left_type->float_type() != NULL) | |
4904 | *result_type = left_type; | |
4905 | else if (right_type->float_type() != NULL) | |
4906 | *result_type = right_type; | |
4907 | else if (left_type->integer_type() != NULL | |
4908 | && left_type->integer_type()->is_rune()) | |
4909 | *result_type = left_type; | |
4910 | else if (right_type->integer_type() != NULL | |
4911 | && right_type->integer_type()->is_rune()) | |
4912 | *result_type = right_type; | |
4913 | else | |
4914 | *result_type = left_type; | |
4915 | ||
4916 | return true; | |
4917 | } | |
4918 | ||
4919 | // Convert an integer comparison code and an operator to a boolean | |
4920 | // value. | |
e440a328 | 4921 | |
4922 | bool | |
0c77715b | 4923 | Binary_expression::cmp_to_bool(Operator op, int cmp) |
e440a328 | 4924 | { |
e440a328 | 4925 | switch (op) |
4926 | { | |
4927 | case OPERATOR_EQEQ: | |
0c77715b | 4928 | return cmp == 0; |
4929 | break; | |
e440a328 | 4930 | case OPERATOR_NOTEQ: |
0c77715b | 4931 | return cmp != 0; |
4932 | break; | |
e440a328 | 4933 | case OPERATOR_LT: |
0c77715b | 4934 | return cmp < 0; |
4935 | break; | |
e440a328 | 4936 | case OPERATOR_LE: |
0c77715b | 4937 | return cmp <= 0; |
e440a328 | 4938 | case OPERATOR_GT: |
0c77715b | 4939 | return cmp > 0; |
e440a328 | 4940 | case OPERATOR_GE: |
0c77715b | 4941 | return cmp >= 0; |
e440a328 | 4942 | default: |
c3e6f413 | 4943 | go_unreachable(); |
e440a328 | 4944 | } |
4945 | } | |
4946 | ||
0c77715b | 4947 | // Compare constants according to OP. |
e440a328 | 4948 | |
4949 | bool | |
0c77715b | 4950 | Binary_expression::compare_constant(Operator op, Numeric_constant* left_nc, |
4951 | Numeric_constant* right_nc, | |
4952 | Location location, bool* result) | |
e440a328 | 4953 | { |
0c77715b | 4954 | Type* left_type = left_nc->type(); |
4955 | Type* right_type = right_nc->type(); | |
4956 | ||
4957 | Type* type; | |
4958 | if (!Binary_expression::operation_type(op, left_type, right_type, &type)) | |
4959 | return false; | |
4960 | ||
4961 | // When comparing an untyped operand to a typed operand, we are | |
4962 | // effectively coercing the untyped operand to the other operand's | |
4963 | // type, so make sure that is valid. | |
4964 | if (!left_nc->set_type(type, true, location) | |
4965 | || !right_nc->set_type(type, true, location)) | |
4966 | return false; | |
4967 | ||
4968 | bool ret; | |
4969 | int cmp; | |
4970 | if (type->complex_type() != NULL) | |
4971 | { | |
4972 | if (op != OPERATOR_EQEQ && op != OPERATOR_NOTEQ) | |
4973 | return false; | |
4974 | ret = Binary_expression::compare_complex(left_nc, right_nc, &cmp); | |
4975 | } | |
4976 | else if (type->float_type() != NULL) | |
4977 | ret = Binary_expression::compare_float(left_nc, right_nc, &cmp); | |
e440a328 | 4978 | else |
0c77715b | 4979 | ret = Binary_expression::compare_integer(left_nc, right_nc, &cmp); |
4980 | ||
4981 | if (ret) | |
4982 | *result = Binary_expression::cmp_to_bool(op, cmp); | |
4983 | ||
4984 | return ret; | |
4985 | } | |
4986 | ||
4987 | // Compare integer constants. | |
4988 | ||
4989 | bool | |
4990 | Binary_expression::compare_integer(const Numeric_constant* left_nc, | |
4991 | const Numeric_constant* right_nc, | |
4992 | int* cmp) | |
4993 | { | |
4994 | mpz_t left_val; | |
4995 | if (!left_nc->to_int(&left_val)) | |
4996 | return false; | |
4997 | mpz_t right_val; | |
4998 | if (!right_nc->to_int(&right_val)) | |
e440a328 | 4999 | { |
0c77715b | 5000 | mpz_clear(left_val); |
5001 | return false; | |
e440a328 | 5002 | } |
0c77715b | 5003 | |
5004 | *cmp = mpz_cmp(left_val, right_val); | |
5005 | ||
5006 | mpz_clear(left_val); | |
5007 | mpz_clear(right_val); | |
5008 | ||
5009 | return true; | |
5010 | } | |
5011 | ||
5012 | // Compare floating point constants. | |
5013 | ||
5014 | bool | |
5015 | Binary_expression::compare_float(const Numeric_constant* left_nc, | |
5016 | const Numeric_constant* right_nc, | |
5017 | int* cmp) | |
5018 | { | |
5019 | mpfr_t left_val; | |
5020 | if (!left_nc->to_float(&left_val)) | |
5021 | return false; | |
5022 | mpfr_t right_val; | |
5023 | if (!right_nc->to_float(&right_val)) | |
e440a328 | 5024 | { |
0c77715b | 5025 | mpfr_clear(left_val); |
5026 | return false; | |
5027 | } | |
5028 | ||
5029 | // We already coerced both operands to the same type. If that type | |
5030 | // is not an abstract type, we need to round the values accordingly. | |
5031 | Type* type = left_nc->type(); | |
5032 | if (!type->is_abstract() && type->float_type() != NULL) | |
5033 | { | |
5034 | int bits = type->float_type()->bits(); | |
5035 | mpfr_prec_round(left_val, bits, GMP_RNDN); | |
5036 | mpfr_prec_round(right_val, bits, GMP_RNDN); | |
e440a328 | 5037 | } |
0c77715b | 5038 | |
5039 | *cmp = mpfr_cmp(left_val, right_val); | |
5040 | ||
5041 | mpfr_clear(left_val); | |
5042 | mpfr_clear(right_val); | |
5043 | ||
5044 | return true; | |
e440a328 | 5045 | } |
5046 | ||
0c77715b | 5047 | // Compare complex constants. Complex numbers may only be compared |
5048 | // for equality. | |
e440a328 | 5049 | |
5050 | bool | |
0c77715b | 5051 | Binary_expression::compare_complex(const Numeric_constant* left_nc, |
5052 | const Numeric_constant* right_nc, | |
5053 | int* cmp) | |
e440a328 | 5054 | { |
fcbea5e4 | 5055 | mpc_t left_val; |
5056 | if (!left_nc->to_complex(&left_val)) | |
0c77715b | 5057 | return false; |
fcbea5e4 | 5058 | mpc_t right_val; |
5059 | if (!right_nc->to_complex(&right_val)) | |
e440a328 | 5060 | { |
fcbea5e4 | 5061 | mpc_clear(left_val); |
0c77715b | 5062 | return false; |
e440a328 | 5063 | } |
0c77715b | 5064 | |
5065 | // We already coerced both operands to the same type. If that type | |
5066 | // is not an abstract type, we need to round the values accordingly. | |
5067 | Type* type = left_nc->type(); | |
5068 | if (!type->is_abstract() && type->complex_type() != NULL) | |
e440a328 | 5069 | { |
0c77715b | 5070 | int bits = type->complex_type()->bits(); |
fcbea5e4 | 5071 | mpfr_prec_round(mpc_realref(left_val), bits / 2, GMP_RNDN); |
5072 | mpfr_prec_round(mpc_imagref(left_val), bits / 2, GMP_RNDN); | |
5073 | mpfr_prec_round(mpc_realref(right_val), bits / 2, GMP_RNDN); | |
5074 | mpfr_prec_round(mpc_imagref(right_val), bits / 2, GMP_RNDN); | |
e440a328 | 5075 | } |
0c77715b | 5076 | |
fcbea5e4 | 5077 | *cmp = mpc_cmp(left_val, right_val) != 0; |
0c77715b | 5078 | |
fcbea5e4 | 5079 | mpc_clear(left_val); |
5080 | mpc_clear(right_val); | |
0c77715b | 5081 | |
5082 | return true; | |
e440a328 | 5083 | } |
5084 | ||
0c77715b | 5085 | // Apply binary opcode OP to LEFT_NC and RIGHT_NC, setting NC. Return |
5086 | // true if this could be done, false if not. Issue errors at LOCATION | |
af7a5274 | 5087 | // as appropriate, and sets *ISSUED_ERROR if it did. |
e440a328 | 5088 | |
5089 | bool | |
0c77715b | 5090 | Binary_expression::eval_constant(Operator op, Numeric_constant* left_nc, |
5091 | Numeric_constant* right_nc, | |
af7a5274 | 5092 | Location location, Numeric_constant* nc, |
5093 | bool* issued_error) | |
e440a328 | 5094 | { |
af7a5274 | 5095 | *issued_error = false; |
e440a328 | 5096 | switch (op) |
5097 | { | |
5098 | case OPERATOR_OROR: | |
5099 | case OPERATOR_ANDAND: | |
5100 | case OPERATOR_EQEQ: | |
5101 | case OPERATOR_NOTEQ: | |
5102 | case OPERATOR_LT: | |
5103 | case OPERATOR_LE: | |
5104 | case OPERATOR_GT: | |
5105 | case OPERATOR_GE: | |
9767e2d3 | 5106 | // These return boolean values, not numeric. |
5107 | return false; | |
0c77715b | 5108 | default: |
5109 | break; | |
5110 | } | |
5111 | ||
5112 | Type* left_type = left_nc->type(); | |
5113 | Type* right_type = right_nc->type(); | |
5114 | ||
5115 | Type* type; | |
5116 | if (!Binary_expression::operation_type(op, left_type, right_type, &type)) | |
5117 | return false; | |
5118 | ||
5119 | bool is_shift = op == OPERATOR_LSHIFT || op == OPERATOR_RSHIFT; | |
5120 | ||
5121 | // When combining an untyped operand with a typed operand, we are | |
5122 | // effectively coercing the untyped operand to the other operand's | |
5123 | // type, so make sure that is valid. | |
5124 | if (!left_nc->set_type(type, true, location)) | |
5125 | return false; | |
5126 | if (!is_shift && !right_nc->set_type(type, true, location)) | |
5127 | return false; | |
85334a21 | 5128 | if (is_shift |
5129 | && ((left_type->integer_type() == NULL | |
5130 | && !left_type->is_abstract()) | |
5131 | || (right_type->integer_type() == NULL | |
5132 | && !right_type->is_abstract()))) | |
5133 | return false; | |
0c77715b | 5134 | |
5135 | bool r; | |
5136 | if (type->complex_type() != NULL) | |
5137 | r = Binary_expression::eval_complex(op, left_nc, right_nc, location, nc); | |
5138 | else if (type->float_type() != NULL) | |
5139 | r = Binary_expression::eval_float(op, left_nc, right_nc, location, nc); | |
5140 | else | |
5141 | r = Binary_expression::eval_integer(op, left_nc, right_nc, location, nc); | |
5142 | ||
5143 | if (r) | |
af7a5274 | 5144 | { |
5145 | r = nc->set_type(type, true, location); | |
5146 | if (!r) | |
5147 | *issued_error = true; | |
5148 | } | |
0c77715b | 5149 | |
5150 | return r; | |
5151 | } | |
5152 | ||
5153 | // Apply binary opcode OP to LEFT_NC and RIGHT_NC, setting NC, using | |
5154 | // integer operations. Return true if this could be done, false if | |
5155 | // not. | |
5156 | ||
5157 | bool | |
5158 | Binary_expression::eval_integer(Operator op, const Numeric_constant* left_nc, | |
5159 | const Numeric_constant* right_nc, | |
5160 | Location location, Numeric_constant* nc) | |
5161 | { | |
5162 | mpz_t left_val; | |
5163 | if (!left_nc->to_int(&left_val)) | |
5164 | return false; | |
5165 | mpz_t right_val; | |
5166 | if (!right_nc->to_int(&right_val)) | |
5167 | { | |
5168 | mpz_clear(left_val); | |
e440a328 | 5169 | return false; |
0c77715b | 5170 | } |
5171 | ||
5172 | mpz_t val; | |
5173 | mpz_init(val); | |
5174 | ||
5175 | switch (op) | |
5176 | { | |
e440a328 | 5177 | case OPERATOR_PLUS: |
5178 | mpz_add(val, left_val, right_val); | |
2c809f8f | 5179 | if (mpz_sizeinbase(val, 2) > 0x100000) |
5180 | { | |
631d5788 | 5181 | go_error_at(location, "constant addition overflow"); |
71a45216 | 5182 | nc->set_invalid(); |
2c809f8f | 5183 | mpz_set_ui(val, 1); |
5184 | } | |
e440a328 | 5185 | break; |
5186 | case OPERATOR_MINUS: | |
5187 | mpz_sub(val, left_val, right_val); | |
2c809f8f | 5188 | if (mpz_sizeinbase(val, 2) > 0x100000) |
5189 | { | |
631d5788 | 5190 | go_error_at(location, "constant subtraction overflow"); |
71a45216 | 5191 | nc->set_invalid(); |
2c809f8f | 5192 | mpz_set_ui(val, 1); |
5193 | } | |
e440a328 | 5194 | break; |
5195 | case OPERATOR_OR: | |
5196 | mpz_ior(val, left_val, right_val); | |
5197 | break; | |
5198 | case OPERATOR_XOR: | |
5199 | mpz_xor(val, left_val, right_val); | |
5200 | break; | |
5201 | case OPERATOR_MULT: | |
5202 | mpz_mul(val, left_val, right_val); | |
2c809f8f | 5203 | if (mpz_sizeinbase(val, 2) > 0x100000) |
5204 | { | |
631d5788 | 5205 | go_error_at(location, "constant multiplication overflow"); |
71a45216 | 5206 | nc->set_invalid(); |
2c809f8f | 5207 | mpz_set_ui(val, 1); |
5208 | } | |
e440a328 | 5209 | break; |
5210 | case OPERATOR_DIV: | |
5211 | if (mpz_sgn(right_val) != 0) | |
5212 | mpz_tdiv_q(val, left_val, right_val); | |
5213 | else | |
5214 | { | |
631d5788 | 5215 | go_error_at(location, "division by zero"); |
71a45216 | 5216 | nc->set_invalid(); |
e440a328 | 5217 | mpz_set_ui(val, 0); |
e440a328 | 5218 | } |
5219 | break; | |
5220 | case OPERATOR_MOD: | |
5221 | if (mpz_sgn(right_val) != 0) | |
5222 | mpz_tdiv_r(val, left_val, right_val); | |
5223 | else | |
5224 | { | |
631d5788 | 5225 | go_error_at(location, "division by zero"); |
71a45216 | 5226 | nc->set_invalid(); |
e440a328 | 5227 | mpz_set_ui(val, 0); |
e440a328 | 5228 | } |
5229 | break; | |
5230 | case OPERATOR_LSHIFT: | |
5231 | { | |
5232 | unsigned long shift = mpz_get_ui(right_val); | |
0c77715b | 5233 | if (mpz_cmp_ui(right_val, shift) == 0 && shift <= 0x100000) |
5234 | mpz_mul_2exp(val, left_val, shift); | |
5235 | else | |
e440a328 | 5236 | { |
631d5788 | 5237 | go_error_at(location, "shift count overflow"); |
71a45216 | 5238 | nc->set_invalid(); |
2c809f8f | 5239 | mpz_set_ui(val, 1); |
e440a328 | 5240 | } |
e440a328 | 5241 | break; |
5242 | } | |
5243 | break; | |
5244 | case OPERATOR_RSHIFT: | |
5245 | { | |
5246 | unsigned long shift = mpz_get_ui(right_val); | |
5247 | if (mpz_cmp_ui(right_val, shift) != 0) | |
5248 | { | |
631d5788 | 5249 | go_error_at(location, "shift count overflow"); |
71a45216 | 5250 | nc->set_invalid(); |
2c809f8f | 5251 | mpz_set_ui(val, 1); |
e440a328 | 5252 | } |
e440a328 | 5253 | else |
0c77715b | 5254 | { |
5255 | if (mpz_cmp_ui(left_val, 0) >= 0) | |
5256 | mpz_tdiv_q_2exp(val, left_val, shift); | |
5257 | else | |
5258 | mpz_fdiv_q_2exp(val, left_val, shift); | |
5259 | } | |
e440a328 | 5260 | break; |
5261 | } | |
5262 | break; | |
5263 | case OPERATOR_AND: | |
5264 | mpz_and(val, left_val, right_val); | |
5265 | break; | |
5266 | case OPERATOR_BITCLEAR: | |
5267 | { | |
5268 | mpz_t tval; | |
5269 | mpz_init(tval); | |
5270 | mpz_com(tval, right_val); | |
5271 | mpz_and(val, left_val, tval); | |
5272 | mpz_clear(tval); | |
5273 | } | |
5274 | break; | |
5275 | default: | |
c3e6f413 | 5276 | go_unreachable(); |
e440a328 | 5277 | } |
5278 | ||
0c77715b | 5279 | mpz_clear(left_val); |
5280 | mpz_clear(right_val); | |
e440a328 | 5281 | |
0c77715b | 5282 | if (left_nc->is_rune() |
5283 | || (op != OPERATOR_LSHIFT | |
5284 | && op != OPERATOR_RSHIFT | |
5285 | && right_nc->is_rune())) | |
5286 | nc->set_rune(NULL, val); | |
5287 | else | |
5288 | nc->set_int(NULL, val); | |
5289 | ||
5290 | mpz_clear(val); | |
e440a328 | 5291 | |
5292 | return true; | |
5293 | } | |
5294 | ||
0c77715b | 5295 | // Apply binary opcode OP to LEFT_NC and RIGHT_NC, setting NC, using |
5296 | // floating point operations. Return true if this could be done, | |
5297 | // false if not. | |
e440a328 | 5298 | |
5299 | bool | |
0c77715b | 5300 | Binary_expression::eval_float(Operator op, const Numeric_constant* left_nc, |
5301 | const Numeric_constant* right_nc, | |
5302 | Location location, Numeric_constant* nc) | |
e440a328 | 5303 | { |
0c77715b | 5304 | mpfr_t left_val; |
5305 | if (!left_nc->to_float(&left_val)) | |
5306 | return false; | |
5307 | mpfr_t right_val; | |
5308 | if (!right_nc->to_float(&right_val)) | |
e440a328 | 5309 | { |
0c77715b | 5310 | mpfr_clear(left_val); |
e440a328 | 5311 | return false; |
0c77715b | 5312 | } |
5313 | ||
5314 | mpfr_t val; | |
5315 | mpfr_init(val); | |
5316 | ||
5317 | bool ret = true; | |
5318 | switch (op) | |
5319 | { | |
e440a328 | 5320 | case OPERATOR_PLUS: |
5321 | mpfr_add(val, left_val, right_val, GMP_RNDN); | |
5322 | break; | |
5323 | case OPERATOR_MINUS: | |
5324 | mpfr_sub(val, left_val, right_val, GMP_RNDN); | |
5325 | break; | |
5326 | case OPERATOR_OR: | |
5327 | case OPERATOR_XOR: | |
5328 | case OPERATOR_AND: | |
5329 | case OPERATOR_BITCLEAR: | |
0c77715b | 5330 | case OPERATOR_MOD: |
5331 | case OPERATOR_LSHIFT: | |
5332 | case OPERATOR_RSHIFT: | |
5333 | mpfr_set_ui(val, 0, GMP_RNDN); | |
5334 | ret = false; | |
5335 | break; | |
e440a328 | 5336 | case OPERATOR_MULT: |
5337 | mpfr_mul(val, left_val, right_val, GMP_RNDN); | |
5338 | break; | |
5339 | case OPERATOR_DIV: | |
0c77715b | 5340 | if (!mpfr_zero_p(right_val)) |
5341 | mpfr_div(val, left_val, right_val, GMP_RNDN); | |
5342 | else | |
5343 | { | |
631d5788 | 5344 | go_error_at(location, "division by zero"); |
71a45216 | 5345 | nc->set_invalid(); |
0c77715b | 5346 | mpfr_set_ui(val, 0, GMP_RNDN); |
5347 | } | |
e440a328 | 5348 | break; |
e440a328 | 5349 | default: |
c3e6f413 | 5350 | go_unreachable(); |
e440a328 | 5351 | } |
5352 | ||
0c77715b | 5353 | mpfr_clear(left_val); |
5354 | mpfr_clear(right_val); | |
e440a328 | 5355 | |
0c77715b | 5356 | nc->set_float(NULL, val); |
5357 | mpfr_clear(val); | |
e440a328 | 5358 | |
0c77715b | 5359 | return ret; |
e440a328 | 5360 | } |
5361 | ||
0c77715b | 5362 | // Apply binary opcode OP to LEFT_NC and RIGHT_NC, setting NC, using |
5363 | // complex operations. Return true if this could be done, false if | |
5364 | // not. | |
e440a328 | 5365 | |
5366 | bool | |
0c77715b | 5367 | Binary_expression::eval_complex(Operator op, const Numeric_constant* left_nc, |
5368 | const Numeric_constant* right_nc, | |
5369 | Location location, Numeric_constant* nc) | |
e440a328 | 5370 | { |
fcbea5e4 | 5371 | mpc_t left_val; |
5372 | if (!left_nc->to_complex(&left_val)) | |
0c77715b | 5373 | return false; |
fcbea5e4 | 5374 | mpc_t right_val; |
5375 | if (!right_nc->to_complex(&right_val)) | |
e440a328 | 5376 | { |
fcbea5e4 | 5377 | mpc_clear(left_val); |
e440a328 | 5378 | return false; |
0c77715b | 5379 | } |
5380 | ||
fcbea5e4 | 5381 | mpc_t val; |
5382 | mpc_init2(val, mpc_precision); | |
0c77715b | 5383 | |
5384 | bool ret = true; | |
5385 | switch (op) | |
5386 | { | |
e440a328 | 5387 | case OPERATOR_PLUS: |
fcbea5e4 | 5388 | mpc_add(val, left_val, right_val, MPC_RNDNN); |
e440a328 | 5389 | break; |
5390 | case OPERATOR_MINUS: | |
fcbea5e4 | 5391 | mpc_sub(val, left_val, right_val, MPC_RNDNN); |
e440a328 | 5392 | break; |
5393 | case OPERATOR_OR: | |
5394 | case OPERATOR_XOR: | |
5395 | case OPERATOR_AND: | |
5396 | case OPERATOR_BITCLEAR: | |
0c77715b | 5397 | case OPERATOR_MOD: |
5398 | case OPERATOR_LSHIFT: | |
5399 | case OPERATOR_RSHIFT: | |
fcbea5e4 | 5400 | mpc_set_ui(val, 0, MPC_RNDNN); |
0c77715b | 5401 | ret = false; |
5402 | break; | |
e440a328 | 5403 | case OPERATOR_MULT: |
fcbea5e4 | 5404 | mpc_mul(val, left_val, right_val, MPC_RNDNN); |
e440a328 | 5405 | break; |
5406 | case OPERATOR_DIV: | |
fcbea5e4 | 5407 | if (mpc_cmp_si(right_val, 0) == 0) |
5408 | { | |
631d5788 | 5409 | go_error_at(location, "division by zero"); |
71a45216 | 5410 | nc->set_invalid(); |
fcbea5e4 | 5411 | mpc_set_ui(val, 0, MPC_RNDNN); |
5412 | break; | |
5413 | } | |
5414 | mpc_div(val, left_val, right_val, MPC_RNDNN); | |
e440a328 | 5415 | break; |
e440a328 | 5416 | default: |
c3e6f413 | 5417 | go_unreachable(); |
e440a328 | 5418 | } |
5419 | ||
fcbea5e4 | 5420 | mpc_clear(left_val); |
5421 | mpc_clear(right_val); | |
e440a328 | 5422 | |
fcbea5e4 | 5423 | nc->set_complex(NULL, val); |
5424 | mpc_clear(val); | |
e440a328 | 5425 | |
0c77715b | 5426 | return ret; |
e440a328 | 5427 | } |
5428 | ||
5429 | // Lower a binary expression. We have to evaluate constant | |
5430 | // expressions now, in order to implement Go's unlimited precision | |
5431 | // constants. | |
5432 | ||
5433 | Expression* | |
e9d3367e | 5434 | Binary_expression::do_lower(Gogo* gogo, Named_object*, |
5435 | Statement_inserter* inserter, int) | |
e440a328 | 5436 | { |
b13c66cd | 5437 | Location location = this->location(); |
e440a328 | 5438 | Operator op = this->op_; |
5439 | Expression* left = this->left_; | |
5440 | Expression* right = this->right_; | |
5441 | ||
5442 | const bool is_comparison = (op == OPERATOR_EQEQ | |
5443 | || op == OPERATOR_NOTEQ | |
5444 | || op == OPERATOR_LT | |
5445 | || op == OPERATOR_LE | |
5446 | || op == OPERATOR_GT | |
5447 | || op == OPERATOR_GE); | |
5448 | ||
0c77715b | 5449 | // Numeric constant expressions. |
e440a328 | 5450 | { |
0c77715b | 5451 | Numeric_constant left_nc; |
5452 | Numeric_constant right_nc; | |
5453 | if (left->numeric_constant_value(&left_nc) | |
5454 | && right->numeric_constant_value(&right_nc)) | |
e440a328 | 5455 | { |
0c77715b | 5456 | if (is_comparison) |
e440a328 | 5457 | { |
0c77715b | 5458 | bool result; |
5459 | if (!Binary_expression::compare_constant(op, &left_nc, | |
5460 | &right_nc, location, | |
5461 | &result)) | |
5462 | return this; | |
e90c9dfc | 5463 | return Expression::make_cast(Type::make_boolean_type(), |
0c77715b | 5464 | Expression::make_boolean(result, |
5465 | location), | |
5466 | location); | |
e440a328 | 5467 | } |
5468 | else | |
5469 | { | |
0c77715b | 5470 | Numeric_constant nc; |
af7a5274 | 5471 | bool issued_error; |
0c77715b | 5472 | if (!Binary_expression::eval_constant(op, &left_nc, &right_nc, |
af7a5274 | 5473 | location, &nc, |
5474 | &issued_error)) | |
5475 | { | |
5476 | if (issued_error) | |
5477 | return Expression::make_error(location); | |
71a45216 | 5478 | return this; |
af7a5274 | 5479 | } |
0c77715b | 5480 | return nc.expression(location); |
e440a328 | 5481 | } |
5482 | } | |
e440a328 | 5483 | } |
5484 | ||
5485 | // String constant expressions. | |
315fa98d | 5486 | if (left->type()->is_string_type() && right->type()->is_string_type()) |
e440a328 | 5487 | { |
5488 | std::string left_string; | |
5489 | std::string right_string; | |
5490 | if (left->string_constant_value(&left_string) | |
5491 | && right->string_constant_value(&right_string)) | |
315fa98d | 5492 | { |
5493 | if (op == OPERATOR_PLUS) | |
5494 | return Expression::make_string(left_string + right_string, | |
5495 | location); | |
5496 | else if (is_comparison) | |
5497 | { | |
5498 | int cmp = left_string.compare(right_string); | |
0c77715b | 5499 | bool r = Binary_expression::cmp_to_bool(op, cmp); |
e90c9dfc | 5500 | return Expression::make_boolean(r, location); |
b40dc774 | 5501 | } |
5502 | } | |
b40dc774 | 5503 | } |
5504 | ||
ceeb12d7 | 5505 | // Lower struct, array, and some interface comparisons. |
e9d3367e | 5506 | if (op == OPERATOR_EQEQ || op == OPERATOR_NOTEQ) |
5507 | { | |
b79832ca | 5508 | if (left->type()->struct_type() != NULL |
5509 | && right->type()->struct_type() != NULL) | |
e9d3367e | 5510 | return this->lower_struct_comparison(gogo, inserter); |
5511 | else if (left->type()->array_type() != NULL | |
b79832ca | 5512 | && !left->type()->is_slice_type() |
5513 | && right->type()->array_type() != NULL | |
5514 | && !right->type()->is_slice_type()) | |
e9d3367e | 5515 | return this->lower_array_comparison(gogo, inserter); |
ceeb12d7 | 5516 | else if ((left->type()->interface_type() != NULL |
5517 | && right->type()->interface_type() == NULL) | |
5518 | || (left->type()->interface_type() == NULL | |
5519 | && right->type()->interface_type() != NULL)) | |
5520 | return this->lower_interface_value_comparison(gogo, inserter); | |
e9d3367e | 5521 | } |
5522 | ||
736a16ba | 5523 | // Lower string concatenation to String_concat_expression, so that |
5524 | // we can group sequences of string additions. | |
5525 | if (this->left_->type()->is_string_type() && this->op_ == OPERATOR_PLUS) | |
5526 | { | |
5527 | Expression_list* exprs; | |
5528 | String_concat_expression* left_sce = | |
5529 | this->left_->string_concat_expression(); | |
5530 | if (left_sce != NULL) | |
5531 | exprs = left_sce->exprs(); | |
5532 | else | |
5533 | { | |
5534 | exprs = new Expression_list(); | |
5535 | exprs->push_back(this->left_); | |
5536 | } | |
5537 | ||
5538 | String_concat_expression* right_sce = | |
5539 | this->right_->string_concat_expression(); | |
5540 | if (right_sce != NULL) | |
5541 | exprs->append(right_sce->exprs()); | |
5542 | else | |
5543 | exprs->push_back(this->right_); | |
5544 | ||
5545 | return Expression::make_string_concat(exprs); | |
5546 | } | |
5547 | ||
e440a328 | 5548 | return this; |
5549 | } | |
5550 | ||
e9d3367e | 5551 | // Lower a struct comparison. |
5552 | ||
5553 | Expression* | |
5554 | Binary_expression::lower_struct_comparison(Gogo* gogo, | |
5555 | Statement_inserter* inserter) | |
5556 | { | |
5557 | Struct_type* st = this->left_->type()->struct_type(); | |
5558 | Struct_type* st2 = this->right_->type()->struct_type(); | |
5559 | if (st2 == NULL) | |
5560 | return this; | |
3a522dcc | 5561 | if (st != st2 |
5562 | && !Type::are_identical(st, st2, | |
5563 | Type::COMPARE_ERRORS | Type::COMPARE_TAGS, | |
5564 | NULL)) | |
e9d3367e | 5565 | return this; |
5566 | if (!Type::are_compatible_for_comparison(true, this->left_->type(), | |
5567 | this->right_->type(), NULL)) | |
5568 | return this; | |
5569 | ||
5570 | // See if we can compare using memcmp. As a heuristic, we use | |
5571 | // memcmp rather than field references and comparisons if there are | |
5572 | // more than two fields. | |
113ef6a5 | 5573 | if (st->compare_is_identity(gogo) && st->total_field_count() > 2) |
e9d3367e | 5574 | return this->lower_compare_to_memcmp(gogo, inserter); |
5575 | ||
5576 | Location loc = this->location(); | |
5577 | ||
5578 | Expression* left = this->left_; | |
5579 | Temporary_statement* left_temp = NULL; | |
5580 | if (left->var_expression() == NULL | |
5581 | && left->temporary_reference_expression() == NULL) | |
5582 | { | |
5583 | left_temp = Statement::make_temporary(left->type(), NULL, loc); | |
5584 | inserter->insert(left_temp); | |
5585 | left = Expression::make_set_and_use_temporary(left_temp, left, loc); | |
5586 | } | |
5587 | ||
5588 | Expression* right = this->right_; | |
5589 | Temporary_statement* right_temp = NULL; | |
5590 | if (right->var_expression() == NULL | |
5591 | && right->temporary_reference_expression() == NULL) | |
5592 | { | |
5593 | right_temp = Statement::make_temporary(right->type(), NULL, loc); | |
5594 | inserter->insert(right_temp); | |
5595 | right = Expression::make_set_and_use_temporary(right_temp, right, loc); | |
5596 | } | |
5597 | ||
5598 | Expression* ret = Expression::make_boolean(true, loc); | |
5599 | const Struct_field_list* fields = st->fields(); | |
5600 | unsigned int field_index = 0; | |
5601 | for (Struct_field_list::const_iterator pf = fields->begin(); | |
5602 | pf != fields->end(); | |
5603 | ++pf, ++field_index) | |
5604 | { | |
f5165c05 | 5605 | if (Gogo::is_sink_name(pf->field_name())) |
5606 | continue; | |
5607 | ||
e9d3367e | 5608 | if (field_index > 0) |
5609 | { | |
5610 | if (left_temp == NULL) | |
5611 | left = left->copy(); | |
5612 | else | |
5613 | left = Expression::make_temporary_reference(left_temp, loc); | |
5614 | if (right_temp == NULL) | |
5615 | right = right->copy(); | |
5616 | else | |
5617 | right = Expression::make_temporary_reference(right_temp, loc); | |
5618 | } | |
5619 | Expression* f1 = Expression::make_field_reference(left, field_index, | |
5620 | loc); | |
5621 | Expression* f2 = Expression::make_field_reference(right, field_index, | |
5622 | loc); | |
5623 | Expression* cond = Expression::make_binary(OPERATOR_EQEQ, f1, f2, loc); | |
5624 | ret = Expression::make_binary(OPERATOR_ANDAND, ret, cond, loc); | |
5625 | } | |
5626 | ||
5627 | if (this->op_ == OPERATOR_NOTEQ) | |
5628 | ret = Expression::make_unary(OPERATOR_NOT, ret, loc); | |
5629 | ||
5630 | return ret; | |
5631 | } | |
5632 | ||
5633 | // Lower an array comparison. | |
5634 | ||
5635 | Expression* | |
5636 | Binary_expression::lower_array_comparison(Gogo* gogo, | |
5637 | Statement_inserter* inserter) | |
5638 | { | |
5639 | Array_type* at = this->left_->type()->array_type(); | |
5640 | Array_type* at2 = this->right_->type()->array_type(); | |
5641 | if (at2 == NULL) | |
5642 | return this; | |
3a522dcc | 5643 | if (at != at2 |
5644 | && !Type::are_identical(at, at2, | |
5645 | Type::COMPARE_ERRORS | Type::COMPARE_TAGS, | |
5646 | NULL)) | |
e9d3367e | 5647 | return this; |
5648 | if (!Type::are_compatible_for_comparison(true, this->left_->type(), | |
5649 | this->right_->type(), NULL)) | |
5650 | return this; | |
5651 | ||
5652 | // Call memcmp directly if possible. This may let the middle-end | |
5653 | // optimize the call. | |
113ef6a5 | 5654 | if (at->compare_is_identity(gogo)) |
e9d3367e | 5655 | return this->lower_compare_to_memcmp(gogo, inserter); |
5656 | ||
5657 | // Call the array comparison function. | |
5658 | Named_object* hash_fn; | |
5659 | Named_object* equal_fn; | |
5660 | at->type_functions(gogo, this->left_->type()->named_type(), NULL, NULL, | |
5661 | &hash_fn, &equal_fn); | |
5662 | ||
5663 | Location loc = this->location(); | |
5664 | ||
5665 | Expression* func = Expression::make_func_reference(equal_fn, NULL, loc); | |
5666 | ||
5667 | Expression_list* args = new Expression_list(); | |
5668 | args->push_back(this->operand_address(inserter, this->left_)); | |
5669 | args->push_back(this->operand_address(inserter, this->right_)); | |
e9d3367e | 5670 | |
5671 | Expression* ret = Expression::make_call(func, args, false, loc); | |
5672 | ||
5673 | if (this->op_ == OPERATOR_NOTEQ) | |
5674 | ret = Expression::make_unary(OPERATOR_NOT, ret, loc); | |
5675 | ||
5676 | return ret; | |
5677 | } | |
5678 | ||
ceeb12d7 | 5679 | // Lower an interface to value comparison. |
5680 | ||
5681 | Expression* | |
5682 | Binary_expression::lower_interface_value_comparison(Gogo*, | |
5683 | Statement_inserter* inserter) | |
5684 | { | |
5685 | Type* left_type = this->left_->type(); | |
5686 | Type* right_type = this->right_->type(); | |
5687 | Interface_type* ift; | |
5688 | if (left_type->interface_type() != NULL) | |
5689 | { | |
5690 | ift = left_type->interface_type(); | |
5691 | if (!ift->implements_interface(right_type, NULL)) | |
5692 | return this; | |
5693 | } | |
5694 | else | |
5695 | { | |
5696 | ift = right_type->interface_type(); | |
5697 | if (!ift->implements_interface(left_type, NULL)) | |
5698 | return this; | |
5699 | } | |
5700 | if (!Type::are_compatible_for_comparison(true, left_type, right_type, NULL)) | |
5701 | return this; | |
5702 | ||
5703 | Location loc = this->location(); | |
5704 | ||
5705 | if (left_type->interface_type() == NULL | |
5706 | && left_type->points_to() == NULL | |
5707 | && !this->left_->is_addressable()) | |
5708 | { | |
5709 | Temporary_statement* temp = | |
5710 | Statement::make_temporary(left_type, NULL, loc); | |
5711 | inserter->insert(temp); | |
5712 | this->left_ = | |
5713 | Expression::make_set_and_use_temporary(temp, this->left_, loc); | |
5714 | } | |
5715 | ||
5716 | if (right_type->interface_type() == NULL | |
5717 | && right_type->points_to() == NULL | |
5718 | && !this->right_->is_addressable()) | |
5719 | { | |
5720 | Temporary_statement* temp = | |
5721 | Statement::make_temporary(right_type, NULL, loc); | |
5722 | inserter->insert(temp); | |
5723 | this->right_ = | |
5724 | Expression::make_set_and_use_temporary(temp, this->right_, loc); | |
5725 | } | |
5726 | ||
5727 | return this; | |
5728 | } | |
5729 | ||
e9d3367e | 5730 | // Lower a struct or array comparison to a call to memcmp. |
5731 | ||
5732 | Expression* | |
5733 | Binary_expression::lower_compare_to_memcmp(Gogo*, Statement_inserter* inserter) | |
5734 | { | |
5735 | Location loc = this->location(); | |
5736 | ||
5737 | Expression* a1 = this->operand_address(inserter, this->left_); | |
5738 | Expression* a2 = this->operand_address(inserter, this->right_); | |
5739 | Expression* len = Expression::make_type_info(this->left_->type(), | |
5740 | TYPE_INFO_SIZE); | |
5741 | ||
5742 | Expression* call = Runtime::make_call(Runtime::MEMCMP, loc, 3, a1, a2, len); | |
e67508fa | 5743 | Expression* zero = Expression::make_integer_ul(0, NULL, loc); |
e9d3367e | 5744 | return Expression::make_binary(this->op_, call, zero, loc); |
5745 | } | |
5746 | ||
a32698ee | 5747 | Expression* |
5c3f3470 | 5748 | Binary_expression::do_flatten(Gogo* gogo, Named_object*, |
a32698ee | 5749 | Statement_inserter* inserter) |
5750 | { | |
5751 | Location loc = this->location(); | |
5bf8be8b | 5752 | if (this->left_->type()->is_error_type() |
5753 | || this->right_->type()->is_error_type() | |
5754 | || this->left_->is_error_expression() | |
5755 | || this->right_->is_error_expression()) | |
5756 | { | |
5757 | go_assert(saw_errors()); | |
5758 | return Expression::make_error(loc); | |
5759 | } | |
5760 | ||
a32698ee | 5761 | Temporary_statement* temp; |
a32698ee | 5762 | |
5763 | Type* left_type = this->left_->type(); | |
5764 | bool is_shift_op = (this->op_ == OPERATOR_LSHIFT | |
5765 | || this->op_ == OPERATOR_RSHIFT); | |
5766 | bool is_idiv_op = ((this->op_ == OPERATOR_DIV && | |
5767 | left_type->integer_type() != NULL) | |
5768 | || this->op_ == OPERATOR_MOD); | |
5769 | ||
a32698ee | 5770 | if (is_shift_op |
5c3f3470 | 5771 | || (is_idiv_op |
5772 | && (gogo->check_divide_by_zero() || gogo->check_divide_overflow()))) | |
a32698ee | 5773 | { |
545ab43b | 5774 | if (!this->left_->is_variable() && !this->left_->is_constant()) |
a32698ee | 5775 | { |
5776 | temp = Statement::make_temporary(NULL, this->left_, loc); | |
5777 | inserter->insert(temp); | |
5778 | this->left_ = Expression::make_temporary_reference(temp, loc); | |
5779 | } | |
545ab43b | 5780 | if (!this->right_->is_variable() && !this->right_->is_constant()) |
a32698ee | 5781 | { |
5782 | temp = | |
5783 | Statement::make_temporary(NULL, this->right_, loc); | |
5784 | this->right_ = Expression::make_temporary_reference(temp, loc); | |
5785 | inserter->insert(temp); | |
5786 | } | |
5787 | } | |
5788 | return this; | |
5789 | } | |
5790 | ||
5791 | ||
e9d3367e | 5792 | // Return the address of EXPR, cast to unsafe.Pointer. |
5793 | ||
5794 | Expression* | |
5795 | Binary_expression::operand_address(Statement_inserter* inserter, | |
5796 | Expression* expr) | |
5797 | { | |
5798 | Location loc = this->location(); | |
5799 | ||
5800 | if (!expr->is_addressable()) | |
5801 | { | |
5802 | Temporary_statement* temp = Statement::make_temporary(expr->type(), NULL, | |
5803 | loc); | |
5804 | inserter->insert(temp); | |
5805 | expr = Expression::make_set_and_use_temporary(temp, expr, loc); | |
5806 | } | |
5807 | expr = Expression::make_unary(OPERATOR_AND, expr, loc); | |
5808 | static_cast<Unary_expression*>(expr)->set_does_not_escape(); | |
5809 | Type* void_type = Type::make_void_type(); | |
5810 | Type* unsafe_pointer_type = Type::make_pointer_type(void_type); | |
5811 | return Expression::make_cast(unsafe_pointer_type, expr, loc); | |
5812 | } | |
5813 | ||
0c77715b | 5814 | // Return the numeric constant value, if it has one. |
e440a328 | 5815 | |
5816 | bool | |
0c77715b | 5817 | Binary_expression::do_numeric_constant_value(Numeric_constant* nc) const |
e440a328 | 5818 | { |
0c77715b | 5819 | Numeric_constant left_nc; |
5820 | if (!this->left_->numeric_constant_value(&left_nc)) | |
5821 | return false; | |
5822 | Numeric_constant right_nc; | |
5823 | if (!this->right_->numeric_constant_value(&right_nc)) | |
5824 | return false; | |
af7a5274 | 5825 | bool issued_error; |
9767e2d3 | 5826 | return Binary_expression::eval_constant(this->op_, &left_nc, &right_nc, |
af7a5274 | 5827 | this->location(), nc, &issued_error); |
e440a328 | 5828 | } |
5829 | ||
5830 | // Note that the value is being discarded. | |
5831 | ||
4f2138d7 | 5832 | bool |
e440a328 | 5833 | Binary_expression::do_discarding_value() |
5834 | { | |
5835 | if (this->op_ == OPERATOR_OROR || this->op_ == OPERATOR_ANDAND) | |
4f2138d7 | 5836 | return this->right_->discarding_value(); |
e440a328 | 5837 | else |
4f2138d7 | 5838 | { |
5839 | this->unused_value_error(); | |
5840 | return false; | |
5841 | } | |
e440a328 | 5842 | } |
5843 | ||
5844 | // Get type. | |
5845 | ||
5846 | Type* | |
5847 | Binary_expression::do_type() | |
5848 | { | |
5f5fea79 | 5849 | if (this->classification() == EXPRESSION_ERROR) |
5850 | return Type::make_error_type(); | |
5851 | ||
e440a328 | 5852 | switch (this->op_) |
5853 | { | |
e440a328 | 5854 | case OPERATOR_EQEQ: |
5855 | case OPERATOR_NOTEQ: | |
5856 | case OPERATOR_LT: | |
5857 | case OPERATOR_LE: | |
5858 | case OPERATOR_GT: | |
5859 | case OPERATOR_GE: | |
e90c9dfc | 5860 | if (this->type_ == NULL) |
5861 | this->type_ = Type::make_boolean_type(); | |
5862 | return this->type_; | |
e440a328 | 5863 | |
5864 | case OPERATOR_PLUS: | |
5865 | case OPERATOR_MINUS: | |
5866 | case OPERATOR_OR: | |
5867 | case OPERATOR_XOR: | |
5868 | case OPERATOR_MULT: | |
5869 | case OPERATOR_DIV: | |
5870 | case OPERATOR_MOD: | |
5871 | case OPERATOR_AND: | |
5872 | case OPERATOR_BITCLEAR: | |
e90c9dfc | 5873 | case OPERATOR_OROR: |
5874 | case OPERATOR_ANDAND: | |
e440a328 | 5875 | { |
0c77715b | 5876 | Type* type; |
5877 | if (!Binary_expression::operation_type(this->op_, | |
5878 | this->left_->type(), | |
5879 | this->right_->type(), | |
5880 | &type)) | |
5881 | return Type::make_error_type(); | |
5882 | return type; | |
e440a328 | 5883 | } |
5884 | ||
5885 | case OPERATOR_LSHIFT: | |
5886 | case OPERATOR_RSHIFT: | |
5887 | return this->left_->type(); | |
5888 | ||
5889 | default: | |
c3e6f413 | 5890 | go_unreachable(); |
e440a328 | 5891 | } |
5892 | } | |
5893 | ||
5894 | // Set type for a binary expression. | |
5895 | ||
5896 | void | |
5897 | Binary_expression::do_determine_type(const Type_context* context) | |
5898 | { | |
5899 | Type* tleft = this->left_->type(); | |
5900 | Type* tright = this->right_->type(); | |
5901 | ||
5902 | // Both sides should have the same type, except for the shift | |
5903 | // operations. For a comparison, we should ignore the incoming | |
5904 | // type. | |
5905 | ||
5906 | bool is_shift_op = (this->op_ == OPERATOR_LSHIFT | |
5907 | || this->op_ == OPERATOR_RSHIFT); | |
5908 | ||
5909 | bool is_comparison = (this->op_ == OPERATOR_EQEQ | |
5910 | || this->op_ == OPERATOR_NOTEQ | |
5911 | || this->op_ == OPERATOR_LT | |
5912 | || this->op_ == OPERATOR_LE | |
5913 | || this->op_ == OPERATOR_GT | |
5914 | || this->op_ == OPERATOR_GE); | |
5915 | ||
c999c2a7 | 5916 | // For constant expressions, the context of the result is not useful in |
5917 | // determining the types of the operands. It is only legal to use abstract | |
5918 | // boolean, numeric, and string constants as operands where it is legal to | |
5919 | // use non-abstract boolean, numeric, and string constants, respectively. | |
5920 | // Any issues with the operation will be resolved in the check_types pass. | |
5921 | bool is_constant_expr = (this->left_->is_constant() | |
5922 | && this->right_->is_constant()); | |
5923 | ||
e440a328 | 5924 | Type_context subcontext(*context); |
5925 | ||
9c4ff2ce | 5926 | if (is_constant_expr && !is_shift_op) |
af7a5274 | 5927 | { |
5928 | subcontext.type = NULL; | |
5929 | subcontext.may_be_abstract = true; | |
5930 | } | |
5931 | else if (is_comparison) | |
e440a328 | 5932 | { |
5933 | // In a comparison, the context does not determine the types of | |
5934 | // the operands. | |
5935 | subcontext.type = NULL; | |
5936 | } | |
5937 | ||
5938 | // Set the context for the left hand operand. | |
5939 | if (is_shift_op) | |
5940 | { | |
b40dc774 | 5941 | // The right hand operand of a shift plays no role in |
5942 | // determining the type of the left hand operand. | |
e440a328 | 5943 | } |
5944 | else if (!tleft->is_abstract()) | |
5945 | subcontext.type = tleft; | |
5946 | else if (!tright->is_abstract()) | |
5947 | subcontext.type = tright; | |
5948 | else if (subcontext.type == NULL) | |
5949 | { | |
5950 | if ((tleft->integer_type() != NULL && tright->integer_type() != NULL) | |
5951 | || (tleft->float_type() != NULL && tright->float_type() != NULL) | |
5952 | || (tleft->complex_type() != NULL && tright->complex_type() != NULL)) | |
5953 | { | |
5954 | // Both sides have an abstract integer, abstract float, or | |
5955 | // abstract complex type. Just let CONTEXT determine | |
5956 | // whether they may remain abstract or not. | |
5957 | } | |
5958 | else if (tleft->complex_type() != NULL) | |
5959 | subcontext.type = tleft; | |
5960 | else if (tright->complex_type() != NULL) | |
5961 | subcontext.type = tright; | |
5962 | else if (tleft->float_type() != NULL) | |
5963 | subcontext.type = tleft; | |
5964 | else if (tright->float_type() != NULL) | |
5965 | subcontext.type = tright; | |
5966 | else | |
5967 | subcontext.type = tleft; | |
f58a23ae | 5968 | |
5969 | if (subcontext.type != NULL && !context->may_be_abstract) | |
5970 | subcontext.type = subcontext.type->make_non_abstract_type(); | |
e440a328 | 5971 | } |
5972 | ||
af7a5274 | 5973 | this->left_->determine_type(&subcontext); |
e440a328 | 5974 | |
e440a328 | 5975 | if (is_shift_op) |
5976 | { | |
b40dc774 | 5977 | // We may have inherited an unusable type for the shift operand. |
5978 | // Give a useful error if that happened. | |
5979 | if (tleft->is_abstract() | |
5980 | && subcontext.type != NULL | |
8ab6effb | 5981 | && !subcontext.may_be_abstract |
f6bc81e6 | 5982 | && subcontext.type->interface_type() == NULL |
8ab6effb | 5983 | && subcontext.type->integer_type() == NULL) |
b40dc774 | 5984 | this->report_error(("invalid context-determined non-integer type " |
8ab6effb | 5985 | "for left operand of shift")); |
b40dc774 | 5986 | |
5987 | // The context for the right hand operand is the same as for the | |
5988 | // left hand operand, except for a shift operator. | |
e440a328 | 5989 | subcontext.type = Type::lookup_integer_type("uint"); |
5990 | subcontext.may_be_abstract = false; | |
5991 | } | |
5992 | ||
af7a5274 | 5993 | this->right_->determine_type(&subcontext); |
e90c9dfc | 5994 | |
5995 | if (is_comparison) | |
5996 | { | |
5997 | if (this->type_ != NULL && !this->type_->is_abstract()) | |
5998 | ; | |
5999 | else if (context->type != NULL && context->type->is_boolean_type()) | |
6000 | this->type_ = context->type; | |
6001 | else if (!context->may_be_abstract) | |
6002 | this->type_ = Type::lookup_bool_type(); | |
6003 | } | |
e440a328 | 6004 | } |
6005 | ||
6006 | // Report an error if the binary operator OP does not support TYPE. | |
be8b5eee | 6007 | // OTYPE is the type of the other operand. Return whether the |
6008 | // operation is OK. This should not be used for shift. | |
e440a328 | 6009 | |
6010 | bool | |
be8b5eee | 6011 | Binary_expression::check_operator_type(Operator op, Type* type, Type* otype, |
b13c66cd | 6012 | Location location) |
e440a328 | 6013 | { |
6014 | switch (op) | |
6015 | { | |
6016 | case OPERATOR_OROR: | |
6017 | case OPERATOR_ANDAND: | |
c999c2a7 | 6018 | if (!type->is_boolean_type() |
6019 | || !otype->is_boolean_type()) | |
e440a328 | 6020 | { |
631d5788 | 6021 | go_error_at(location, "expected boolean type"); |
e440a328 | 6022 | return false; |
6023 | } | |
6024 | break; | |
6025 | ||
6026 | case OPERATOR_EQEQ: | |
6027 | case OPERATOR_NOTEQ: | |
e9d3367e | 6028 | { |
6029 | std::string reason; | |
6030 | if (!Type::are_compatible_for_comparison(true, type, otype, &reason)) | |
6031 | { | |
631d5788 | 6032 | go_error_at(location, "%s", reason.c_str()); |
e9d3367e | 6033 | return false; |
6034 | } | |
6035 | } | |
e440a328 | 6036 | break; |
6037 | ||
6038 | case OPERATOR_LT: | |
6039 | case OPERATOR_LE: | |
6040 | case OPERATOR_GT: | |
6041 | case OPERATOR_GE: | |
e9d3367e | 6042 | { |
6043 | std::string reason; | |
6044 | if (!Type::are_compatible_for_comparison(false, type, otype, &reason)) | |
6045 | { | |
631d5788 | 6046 | go_error_at(location, "%s", reason.c_str()); |
e9d3367e | 6047 | return false; |
6048 | } | |
6049 | } | |
e440a328 | 6050 | break; |
6051 | ||
6052 | case OPERATOR_PLUS: | |
6053 | case OPERATOR_PLUSEQ: | |
c999c2a7 | 6054 | if ((!type->is_numeric_type() && !type->is_string_type()) |
6055 | || (!otype->is_numeric_type() && !otype->is_string_type())) | |
e440a328 | 6056 | { |
631d5788 | 6057 | go_error_at(location, |
e440a328 | 6058 | "expected integer, floating, complex, or string type"); |
6059 | return false; | |
6060 | } | |
6061 | break; | |
6062 | ||
6063 | case OPERATOR_MINUS: | |
6064 | case OPERATOR_MINUSEQ: | |
6065 | case OPERATOR_MULT: | |
6066 | case OPERATOR_MULTEQ: | |
6067 | case OPERATOR_DIV: | |
6068 | case OPERATOR_DIVEQ: | |
c999c2a7 | 6069 | if (!type->is_numeric_type() || !otype->is_numeric_type()) |
e440a328 | 6070 | { |
631d5788 | 6071 | go_error_at(location, "expected integer, floating, or complex type"); |
e440a328 | 6072 | return false; |
6073 | } | |
6074 | break; | |
6075 | ||
6076 | case OPERATOR_MOD: | |
6077 | case OPERATOR_MODEQ: | |
6078 | case OPERATOR_OR: | |
6079 | case OPERATOR_OREQ: | |
6080 | case OPERATOR_AND: | |
6081 | case OPERATOR_ANDEQ: | |
6082 | case OPERATOR_XOR: | |
6083 | case OPERATOR_XOREQ: | |
6084 | case OPERATOR_BITCLEAR: | |
6085 | case OPERATOR_BITCLEAREQ: | |
c999c2a7 | 6086 | if (type->integer_type() == NULL || otype->integer_type() == NULL) |
e440a328 | 6087 | { |
631d5788 | 6088 | go_error_at(location, "expected integer type"); |
e440a328 | 6089 | return false; |
6090 | } | |
6091 | break; | |
6092 | ||
6093 | default: | |
c3e6f413 | 6094 | go_unreachable(); |
e440a328 | 6095 | } |
6096 | ||
6097 | return true; | |
6098 | } | |
6099 | ||
6100 | // Check types. | |
6101 | ||
6102 | void | |
6103 | Binary_expression::do_check_types(Gogo*) | |
6104 | { | |
5f5fea79 | 6105 | if (this->classification() == EXPRESSION_ERROR) |
6106 | return; | |
6107 | ||
e440a328 | 6108 | Type* left_type = this->left_->type(); |
6109 | Type* right_type = this->right_->type(); | |
5c13bd80 | 6110 | if (left_type->is_error() || right_type->is_error()) |
9fe897ef | 6111 | { |
6112 | this->set_is_error(); | |
6113 | return; | |
6114 | } | |
e440a328 | 6115 | |
6116 | if (this->op_ == OPERATOR_EQEQ | |
6117 | || this->op_ == OPERATOR_NOTEQ | |
6118 | || this->op_ == OPERATOR_LT | |
6119 | || this->op_ == OPERATOR_LE | |
6120 | || this->op_ == OPERATOR_GT | |
6121 | || this->op_ == OPERATOR_GE) | |
6122 | { | |
907c5ecd | 6123 | if (left_type->is_nil_type() && right_type->is_nil_type()) |
6124 | { | |
6125 | this->report_error(_("invalid comparison of nil with nil")); | |
6126 | return; | |
6127 | } | |
e440a328 | 6128 | if (!Type::are_assignable(left_type, right_type, NULL) |
6129 | && !Type::are_assignable(right_type, left_type, NULL)) | |
6130 | { | |
6131 | this->report_error(_("incompatible types in binary expression")); | |
6132 | return; | |
6133 | } | |
6134 | if (!Binary_expression::check_operator_type(this->op_, left_type, | |
be8b5eee | 6135 | right_type, |
e440a328 | 6136 | this->location()) |
6137 | || !Binary_expression::check_operator_type(this->op_, right_type, | |
be8b5eee | 6138 | left_type, |
e440a328 | 6139 | this->location())) |
6140 | { | |
6141 | this->set_is_error(); | |
6142 | return; | |
6143 | } | |
6144 | } | |
6145 | else if (this->op_ != OPERATOR_LSHIFT && this->op_ != OPERATOR_RSHIFT) | |
6146 | { | |
6147 | if (!Type::are_compatible_for_binop(left_type, right_type)) | |
6148 | { | |
6149 | this->report_error(_("incompatible types in binary expression")); | |
6150 | return; | |
6151 | } | |
6152 | if (!Binary_expression::check_operator_type(this->op_, left_type, | |
be8b5eee | 6153 | right_type, |
e440a328 | 6154 | this->location())) |
6155 | { | |
6156 | this->set_is_error(); | |
6157 | return; | |
6158 | } | |
5c65b19d | 6159 | if (this->op_ == OPERATOR_DIV || this->op_ == OPERATOR_MOD) |
6160 | { | |
6161 | // Division by a zero integer constant is an error. | |
6162 | Numeric_constant rconst; | |
6163 | unsigned long rval; | |
6164 | if (left_type->integer_type() != NULL | |
6165 | && this->right_->numeric_constant_value(&rconst) | |
6166 | && rconst.to_unsigned_long(&rval) == Numeric_constant::NC_UL_VALID | |
6167 | && rval == 0) | |
6168 | { | |
6169 | this->report_error(_("integer division by zero")); | |
6170 | return; | |
6171 | } | |
6172 | } | |
e440a328 | 6173 | } |
6174 | else | |
6175 | { | |
6176 | if (left_type->integer_type() == NULL) | |
6177 | this->report_error(_("shift of non-integer operand")); | |
6178 | ||
6b5e0fac | 6179 | if (right_type->is_string_type()) |
6180 | this->report_error(_("shift count not unsigned integer")); | |
6181 | else if (!right_type->is_abstract() | |
e440a328 | 6182 | && (right_type->integer_type() == NULL |
6183 | || !right_type->integer_type()->is_unsigned())) | |
6184 | this->report_error(_("shift count not unsigned integer")); | |
6185 | else | |
6186 | { | |
0c77715b | 6187 | Numeric_constant nc; |
6188 | if (this->right_->numeric_constant_value(&nc)) | |
e440a328 | 6189 | { |
0c77715b | 6190 | mpz_t val; |
6191 | if (!nc.to_int(&val)) | |
6192 | this->report_error(_("shift count not unsigned integer")); | |
6193 | else | |
a4eba91b | 6194 | { |
0c77715b | 6195 | if (mpz_sgn(val) < 0) |
6196 | { | |
6197 | this->report_error(_("negative shift count")); | |
0c77715b | 6198 | Location rloc = this->right_->location(); |
e67508fa | 6199 | this->right_ = Expression::make_integer_ul(0, right_type, |
6200 | rloc); | |
0c77715b | 6201 | } |
6202 | mpz_clear(val); | |
a4eba91b | 6203 | } |
e440a328 | 6204 | } |
e440a328 | 6205 | } |
6206 | } | |
6207 | } | |
6208 | ||
ea664253 | 6209 | // Get the backend representation for a binary expression. |
e440a328 | 6210 | |
ea664253 | 6211 | Bexpression* |
6212 | Binary_expression::do_get_backend(Translate_context* context) | |
e440a328 | 6213 | { |
1b1f2abf | 6214 | Gogo* gogo = context->gogo(); |
a32698ee | 6215 | Location loc = this->location(); |
6216 | Type* left_type = this->left_->type(); | |
6217 | Type* right_type = this->right_->type(); | |
1b1f2abf | 6218 | |
e440a328 | 6219 | bool use_left_type = true; |
6220 | bool is_shift_op = false; | |
29a2d1d8 | 6221 | bool is_idiv_op = false; |
e440a328 | 6222 | switch (this->op_) |
6223 | { | |
6224 | case OPERATOR_EQEQ: | |
6225 | case OPERATOR_NOTEQ: | |
6226 | case OPERATOR_LT: | |
6227 | case OPERATOR_LE: | |
6228 | case OPERATOR_GT: | |
6229 | case OPERATOR_GE: | |
ea664253 | 6230 | return Expression::comparison(context, this->type_, this->op_, |
6231 | this->left_, this->right_, loc); | |
e440a328 | 6232 | |
6233 | case OPERATOR_OROR: | |
e440a328 | 6234 | case OPERATOR_ANDAND: |
e440a328 | 6235 | use_left_type = false; |
6236 | break; | |
6237 | case OPERATOR_PLUS: | |
e440a328 | 6238 | case OPERATOR_MINUS: |
e440a328 | 6239 | case OPERATOR_OR: |
e440a328 | 6240 | case OPERATOR_XOR: |
e440a328 | 6241 | case OPERATOR_MULT: |
e440a328 | 6242 | break; |
6243 | case OPERATOR_DIV: | |
a32698ee | 6244 | if (left_type->float_type() != NULL || left_type->complex_type() != NULL) |
6245 | break; | |
729f8831 | 6246 | // Fall through. |
e440a328 | 6247 | case OPERATOR_MOD: |
29a2d1d8 | 6248 | is_idiv_op = true; |
e440a328 | 6249 | break; |
6250 | case OPERATOR_LSHIFT: | |
e440a328 | 6251 | case OPERATOR_RSHIFT: |
e440a328 | 6252 | is_shift_op = true; |
6253 | break; | |
e440a328 | 6254 | case OPERATOR_BITCLEAR: |
a32698ee | 6255 | this->right_ = Expression::make_unary(OPERATOR_XOR, this->right_, loc); |
6256 | case OPERATOR_AND: | |
e440a328 | 6257 | break; |
6258 | default: | |
c3e6f413 | 6259 | go_unreachable(); |
e440a328 | 6260 | } |
6261 | ||
736a16ba | 6262 | // The only binary operation for string is +, and that should have |
6263 | // been converted to a String_concat_expression in do_lower. | |
6264 | go_assert(!left_type->is_string_type()); | |
a32698ee | 6265 | |
6266 | // For complex division Go might want slightly different results than the | |
6267 | // backend implementation provides, so we have our own runtime routine. | |
1850e20c | 6268 | if (this->op_ == OPERATOR_DIV && this->left_->type()->complex_type() != NULL) |
6269 | { | |
a32698ee | 6270 | Runtime::Function complex_code; |
1850e20c | 6271 | switch (this->left_->type()->complex_type()->bits()) |
6272 | { | |
6273 | case 64: | |
a32698ee | 6274 | complex_code = Runtime::COMPLEX64_DIV; |
1850e20c | 6275 | break; |
6276 | case 128: | |
a32698ee | 6277 | complex_code = Runtime::COMPLEX128_DIV; |
1850e20c | 6278 | break; |
6279 | default: | |
6280 | go_unreachable(); | |
6281 | } | |
a32698ee | 6282 | Expression* complex_div = |
6283 | Runtime::make_call(complex_code, loc, 2, this->left_, this->right_); | |
ea664253 | 6284 | return complex_div->get_backend(context); |
1850e20c | 6285 | } |
6286 | ||
ea664253 | 6287 | Bexpression* left = this->left_->get_backend(context); |
6288 | Bexpression* right = this->right_->get_backend(context); | |
e440a328 | 6289 | |
a32698ee | 6290 | Type* type = use_left_type ? left_type : right_type; |
6291 | Btype* btype = type->get_backend(gogo); | |
6292 | ||
6293 | Bexpression* ret = | |
6294 | gogo->backend()->binary_expression(this->op_, left, right, loc); | |
6295 | ret = gogo->backend()->convert_expression(btype, ret, loc); | |
e440a328 | 6296 | |
a32698ee | 6297 | // Initialize overflow constants. |
6298 | Bexpression* overflow; | |
6299 | mpz_t zero; | |
6300 | mpz_init_set_ui(zero, 0UL); | |
6301 | mpz_t one; | |
6302 | mpz_init_set_ui(one, 1UL); | |
6303 | mpz_t neg_one; | |
6304 | mpz_init_set_si(neg_one, -1); | |
e440a328 | 6305 | |
a32698ee | 6306 | Btype* left_btype = left_type->get_backend(gogo); |
6307 | Btype* right_btype = right_type->get_backend(gogo); | |
e440a328 | 6308 | |
6309 | // In Go, a shift larger than the size of the type is well-defined. | |
a32698ee | 6310 | // This is not true in C, so we need to insert a conditional. |
e440a328 | 6311 | if (is_shift_op) |
6312 | { | |
a32698ee | 6313 | go_assert(left_type->integer_type() != NULL); |
e440a328 | 6314 | |
a32698ee | 6315 | int bits = left_type->integer_type()->bits(); |
a7c5b619 | 6316 | |
6317 | Numeric_constant nc; | |
6318 | unsigned long ul; | |
6319 | if (!this->right_->numeric_constant_value(&nc) | |
6320 | || nc.to_unsigned_long(&ul) != Numeric_constant::NC_UL_VALID | |
6321 | || ul >= static_cast<unsigned long>(bits)) | |
e440a328 | 6322 | { |
a7c5b619 | 6323 | mpz_t bitsval; |
6324 | mpz_init_set_ui(bitsval, bits); | |
6325 | Bexpression* bits_expr = | |
6326 | gogo->backend()->integer_constant_expression(right_btype, bitsval); | |
6327 | Bexpression* compare = | |
6328 | gogo->backend()->binary_expression(OPERATOR_LT, | |
6329 | right, bits_expr, loc); | |
6330 | ||
6331 | Bexpression* zero_expr = | |
6332 | gogo->backend()->integer_constant_expression(left_btype, zero); | |
6333 | overflow = zero_expr; | |
6334 | Bfunction* bfn = context->function()->func_value()->get_decl(); | |
6335 | if (this->op_ == OPERATOR_RSHIFT | |
6336 | && !left_type->integer_type()->is_unsigned()) | |
6337 | { | |
6338 | Bexpression* neg_expr = | |
6339 | gogo->backend()->binary_expression(OPERATOR_LT, left, | |
6340 | zero_expr, loc); | |
6341 | Bexpression* neg_one_expr = | |
6342 | gogo->backend()->integer_constant_expression(left_btype, | |
6343 | neg_one); | |
6344 | overflow = gogo->backend()->conditional_expression(bfn, | |
6345 | btype, | |
6346 | neg_expr, | |
6347 | neg_one_expr, | |
6348 | zero_expr, | |
6349 | loc); | |
6350 | } | |
6351 | ret = gogo->backend()->conditional_expression(bfn, btype, compare, | |
6352 | ret, overflow, loc); | |
6353 | mpz_clear(bitsval); | |
29a2d1d8 | 6354 | } |
29a2d1d8 | 6355 | } |
6356 | ||
6357 | // Add checks for division by zero and division overflow as needed. | |
6358 | if (is_idiv_op) | |
6359 | { | |
5c3f3470 | 6360 | if (gogo->check_divide_by_zero()) |
29a2d1d8 | 6361 | { |
6362 | // right == 0 | |
a32698ee | 6363 | Bexpression* zero_expr = |
6364 | gogo->backend()->integer_constant_expression(right_btype, zero); | |
6365 | Bexpression* check = | |
6366 | gogo->backend()->binary_expression(OPERATOR_EQEQ, | |
6367 | right, zero_expr, loc); | |
29a2d1d8 | 6368 | |
a32698ee | 6369 | // __go_runtime_error(RUNTIME_ERROR_DIVISION_BY_ZERO) |
29a2d1d8 | 6370 | int errcode = RUNTIME_ERROR_DIVISION_BY_ZERO; |
ea664253 | 6371 | Bexpression* crash = gogo->runtime_error(errcode, |
6372 | loc)->get_backend(context); | |
29a2d1d8 | 6373 | |
6374 | // right == 0 ? (__go_runtime_error(...), 0) : ret | |
93715b75 | 6375 | Bfunction* bfn = context->function()->func_value()->get_decl(); |
6376 | ret = gogo->backend()->conditional_expression(bfn, btype, | |
6377 | check, crash, | |
ea664253 | 6378 | ret, loc); |
b13c66cd | 6379 | } |
6380 | ||
5c3f3470 | 6381 | if (gogo->check_divide_overflow()) |
29a2d1d8 | 6382 | { |
6383 | // right == -1 | |
6384 | // FIXME: It would be nice to say that this test is expected | |
6385 | // to return false. | |
a32698ee | 6386 | |
6387 | Bexpression* neg_one_expr = | |
6388 | gogo->backend()->integer_constant_expression(right_btype, neg_one); | |
6389 | Bexpression* check = | |
6390 | gogo->backend()->binary_expression(OPERATOR_EQEQ, | |
6391 | right, neg_one_expr, loc); | |
6392 | ||
6393 | Bexpression* zero_expr = | |
6394 | gogo->backend()->integer_constant_expression(btype, zero); | |
6395 | Bexpression* one_expr = | |
6396 | gogo->backend()->integer_constant_expression(btype, one); | |
93715b75 | 6397 | Bfunction* bfn = context->function()->func_value()->get_decl(); |
a32698ee | 6398 | |
6399 | if (type->integer_type()->is_unsigned()) | |
29a2d1d8 | 6400 | { |
6401 | // An unsigned -1 is the largest possible number, so | |
6402 | // dividing is always 1 or 0. | |
a32698ee | 6403 | |
6404 | Bexpression* cmp = | |
6405 | gogo->backend()->binary_expression(OPERATOR_EQEQ, | |
6406 | left, right, loc); | |
29a2d1d8 | 6407 | if (this->op_ == OPERATOR_DIV) |
a32698ee | 6408 | overflow = |
93715b75 | 6409 | gogo->backend()->conditional_expression(bfn, btype, cmp, |
a32698ee | 6410 | one_expr, zero_expr, |
6411 | loc); | |
29a2d1d8 | 6412 | else |
a32698ee | 6413 | overflow = |
93715b75 | 6414 | gogo->backend()->conditional_expression(bfn, btype, cmp, |
a32698ee | 6415 | zero_expr, left, |
6416 | loc); | |
29a2d1d8 | 6417 | } |
6418 | else | |
6419 | { | |
6420 | // Computing left / -1 is the same as computing - left, | |
6421 | // which does not overflow since Go sets -fwrapv. | |
6422 | if (this->op_ == OPERATOR_DIV) | |
a32698ee | 6423 | { |
6424 | Expression* negate_expr = | |
6425 | Expression::make_unary(OPERATOR_MINUS, this->left_, loc); | |
ea664253 | 6426 | overflow = negate_expr->get_backend(context); |
a32698ee | 6427 | } |
29a2d1d8 | 6428 | else |
a32698ee | 6429 | overflow = zero_expr; |
29a2d1d8 | 6430 | } |
a32698ee | 6431 | overflow = gogo->backend()->convert_expression(btype, overflow, loc); |
29a2d1d8 | 6432 | |
6433 | // right == -1 ? - left : ret | |
93715b75 | 6434 | ret = gogo->backend()->conditional_expression(bfn, btype, |
6435 | check, overflow, | |
a32698ee | 6436 | ret, loc); |
29a2d1d8 | 6437 | } |
e440a328 | 6438 | } |
6439 | ||
a32698ee | 6440 | mpz_clear(zero); |
6441 | mpz_clear(one); | |
6442 | mpz_clear(neg_one); | |
ea664253 | 6443 | return ret; |
e440a328 | 6444 | } |
6445 | ||
6446 | // Export a binary expression. | |
6447 | ||
6448 | void | |
548be246 | 6449 | Binary_expression::do_export(Export_function_body* efb) const |
e440a328 | 6450 | { |
548be246 | 6451 | efb->write_c_string("("); |
6452 | this->left_->export_expression(efb); | |
e440a328 | 6453 | switch (this->op_) |
6454 | { | |
6455 | case OPERATOR_OROR: | |
548be246 | 6456 | efb->write_c_string(" || "); |
e440a328 | 6457 | break; |
6458 | case OPERATOR_ANDAND: | |
548be246 | 6459 | efb->write_c_string(" && "); |
e440a328 | 6460 | break; |
6461 | case OPERATOR_EQEQ: | |
548be246 | 6462 | efb->write_c_string(" == "); |
e440a328 | 6463 | break; |
6464 | case OPERATOR_NOTEQ: | |
548be246 | 6465 | efb->write_c_string(" != "); |
e440a328 | 6466 | break; |
6467 | case OPERATOR_LT: | |
548be246 | 6468 | efb->write_c_string(" < "); |
e440a328 | 6469 | break; |
6470 | case OPERATOR_LE: | |
548be246 | 6471 | efb->write_c_string(" <= "); |
e440a328 | 6472 | break; |
6473 | case OPERATOR_GT: | |
548be246 | 6474 | efb->write_c_string(" > "); |
e440a328 | 6475 | break; |
6476 | case OPERATOR_GE: | |
548be246 | 6477 | efb->write_c_string(" >= "); |
e440a328 | 6478 | break; |
6479 | case OPERATOR_PLUS: | |
548be246 | 6480 | efb->write_c_string(" + "); |
e440a328 | 6481 | break; |
6482 | case OPERATOR_MINUS: | |
548be246 | 6483 | efb->write_c_string(" - "); |
e440a328 | 6484 | break; |
6485 | case OPERATOR_OR: | |
548be246 | 6486 | efb->write_c_string(" | "); |
e440a328 | 6487 | break; |
6488 | case OPERATOR_XOR: | |
548be246 | 6489 | efb->write_c_string(" ^ "); |
e440a328 | 6490 | break; |
6491 | case OPERATOR_MULT: | |
548be246 | 6492 | efb->write_c_string(" * "); |
e440a328 | 6493 | break; |
6494 | case OPERATOR_DIV: | |
548be246 | 6495 | efb->write_c_string(" / "); |
e440a328 | 6496 | break; |
6497 | case OPERATOR_MOD: | |
548be246 | 6498 | efb->write_c_string(" % "); |
e440a328 | 6499 | break; |
6500 | case OPERATOR_LSHIFT: | |
548be246 | 6501 | efb->write_c_string(" << "); |
e440a328 | 6502 | break; |
6503 | case OPERATOR_RSHIFT: | |
548be246 | 6504 | efb->write_c_string(" >> "); |
e440a328 | 6505 | break; |
6506 | case OPERATOR_AND: | |
548be246 | 6507 | efb->write_c_string(" & "); |
e440a328 | 6508 | break; |
6509 | case OPERATOR_BITCLEAR: | |
548be246 | 6510 | efb->write_c_string(" &^ "); |
e440a328 | 6511 | break; |
6512 | default: | |
c3e6f413 | 6513 | go_unreachable(); |
e440a328 | 6514 | } |
548be246 | 6515 | this->right_->export_expression(efb); |
6516 | efb->write_c_string(")"); | |
e440a328 | 6517 | } |
6518 | ||
6519 | // Import a binary expression. | |
6520 | ||
6521 | Expression* | |
bc8e2ef4 | 6522 | Binary_expression::do_import(Import_expression* imp, Location loc) |
e440a328 | 6523 | { |
6524 | imp->require_c_string("("); | |
6525 | ||
9b92780c | 6526 | Expression* left = Expression::import_expression(imp, loc); |
e440a328 | 6527 | |
6528 | Operator op; | |
6529 | if (imp->match_c_string(" || ")) | |
6530 | { | |
6531 | op = OPERATOR_OROR; | |
6532 | imp->advance(4); | |
6533 | } | |
6534 | else if (imp->match_c_string(" && ")) | |
6535 | { | |
6536 | op = OPERATOR_ANDAND; | |
6537 | imp->advance(4); | |
6538 | } | |
6539 | else if (imp->match_c_string(" == ")) | |
6540 | { | |
6541 | op = OPERATOR_EQEQ; | |
6542 | imp->advance(4); | |
6543 | } | |
6544 | else if (imp->match_c_string(" != ")) | |
6545 | { | |
6546 | op = OPERATOR_NOTEQ; | |
6547 | imp->advance(4); | |
6548 | } | |
6549 | else if (imp->match_c_string(" < ")) | |
6550 | { | |
6551 | op = OPERATOR_LT; | |
6552 | imp->advance(3); | |
6553 | } | |
6554 | else if (imp->match_c_string(" <= ")) | |
6555 | { | |
6556 | op = OPERATOR_LE; | |
6557 | imp->advance(4); | |
6558 | } | |
6559 | else if (imp->match_c_string(" > ")) | |
6560 | { | |
6561 | op = OPERATOR_GT; | |
6562 | imp->advance(3); | |
6563 | } | |
6564 | else if (imp->match_c_string(" >= ")) | |
6565 | { | |
6566 | op = OPERATOR_GE; | |
6567 | imp->advance(4); | |
6568 | } | |
6569 | else if (imp->match_c_string(" + ")) | |
6570 | { | |
6571 | op = OPERATOR_PLUS; | |
6572 | imp->advance(3); | |
6573 | } | |
6574 | else if (imp->match_c_string(" - ")) | |
6575 | { | |
6576 | op = OPERATOR_MINUS; | |
6577 | imp->advance(3); | |
6578 | } | |
6579 | else if (imp->match_c_string(" | ")) | |
6580 | { | |
6581 | op = OPERATOR_OR; | |
6582 | imp->advance(3); | |
6583 | } | |
6584 | else if (imp->match_c_string(" ^ ")) | |
6585 | { | |
6586 | op = OPERATOR_XOR; | |
6587 | imp->advance(3); | |
6588 | } | |
6589 | else if (imp->match_c_string(" * ")) | |
6590 | { | |
6591 | op = OPERATOR_MULT; | |
6592 | imp->advance(3); | |
6593 | } | |
6594 | else if (imp->match_c_string(" / ")) | |
6595 | { | |
6596 | op = OPERATOR_DIV; | |
6597 | imp->advance(3); | |
6598 | } | |
6599 | else if (imp->match_c_string(" % ")) | |
6600 | { | |
6601 | op = OPERATOR_MOD; | |
6602 | imp->advance(3); | |
6603 | } | |
6604 | else if (imp->match_c_string(" << ")) | |
6605 | { | |
6606 | op = OPERATOR_LSHIFT; | |
6607 | imp->advance(4); | |
6608 | } | |
6609 | else if (imp->match_c_string(" >> ")) | |
6610 | { | |
6611 | op = OPERATOR_RSHIFT; | |
6612 | imp->advance(4); | |
6613 | } | |
6614 | else if (imp->match_c_string(" & ")) | |
6615 | { | |
6616 | op = OPERATOR_AND; | |
6617 | imp->advance(3); | |
6618 | } | |
6619 | else if (imp->match_c_string(" &^ ")) | |
6620 | { | |
6621 | op = OPERATOR_BITCLEAR; | |
6622 | imp->advance(4); | |
6623 | } | |
6624 | else | |
6625 | { | |
631d5788 | 6626 | go_error_at(imp->location(), "unrecognized binary operator"); |
9b92780c | 6627 | return Expression::make_error(loc); |
e440a328 | 6628 | } |
6629 | ||
9b92780c | 6630 | Expression* right = Expression::import_expression(imp, loc); |
e440a328 | 6631 | |
6632 | imp->require_c_string(")"); | |
6633 | ||
9b92780c | 6634 | return Expression::make_binary(op, left, right, loc); |
e440a328 | 6635 | } |
6636 | ||
d751bb78 | 6637 | // Dump ast representation of a binary expression. |
6638 | ||
6639 | void | |
6640 | Binary_expression::do_dump_expression(Ast_dump_context* ast_dump_context) const | |
6641 | { | |
6642 | ast_dump_context->ostream() << "("; | |
6643 | ast_dump_context->dump_expression(this->left_); | |
6644 | ast_dump_context->ostream() << " "; | |
6645 | ast_dump_context->dump_operator(this->op_); | |
6646 | ast_dump_context->ostream() << " "; | |
6647 | ast_dump_context->dump_expression(this->right_); | |
6648 | ast_dump_context->ostream() << ") "; | |
6649 | } | |
6650 | ||
e440a328 | 6651 | // Make a binary expression. |
6652 | ||
6653 | Expression* | |
6654 | Expression::make_binary(Operator op, Expression* left, Expression* right, | |
b13c66cd | 6655 | Location location) |
e440a328 | 6656 | { |
6657 | return new Binary_expression(op, left, right, location); | |
6658 | } | |
6659 | ||
6660 | // Implement a comparison. | |
6661 | ||
a32698ee | 6662 | Bexpression* |
6663 | Expression::comparison(Translate_context* context, Type* result_type, | |
6664 | Operator op, Expression* left, Expression* right, | |
6665 | Location location) | |
e440a328 | 6666 | { |
2387f644 | 6667 | Type* left_type = left->type(); |
6668 | Type* right_type = right->type(); | |
ceeb12d7 | 6669 | |
e67508fa | 6670 | Expression* zexpr = Expression::make_integer_ul(0, NULL, location); |
1b1f2abf | 6671 | |
15c67ee2 | 6672 | if (left_type->is_string_type() && right_type->is_string_type()) |
e440a328 | 6673 | { |
6098d6cb | 6674 | if (op == OPERATOR_EQEQ || op == OPERATOR_NOTEQ) |
6675 | { | |
6676 | left = Runtime::make_call(Runtime::EQSTRING, location, 2, | |
6677 | left, right); | |
6678 | right = Expression::make_boolean(true, location); | |
6679 | } | |
6680 | else | |
6681 | { | |
6682 | left = Runtime::make_call(Runtime::CMPSTRING, location, 2, | |
6683 | left, right); | |
6684 | right = zexpr; | |
6685 | } | |
e440a328 | 6686 | } |
15c67ee2 | 6687 | else if ((left_type->interface_type() != NULL |
6688 | && right_type->interface_type() == NULL | |
6689 | && !right_type->is_nil_type()) | |
6690 | || (left_type->interface_type() == NULL | |
6691 | && !left_type->is_nil_type() | |
6692 | && right_type->interface_type() != NULL)) | |
e440a328 | 6693 | { |
6694 | // Comparing an interface value to a non-interface value. | |
6695 | if (left_type->interface_type() == NULL) | |
6696 | { | |
6697 | std::swap(left_type, right_type); | |
2387f644 | 6698 | std::swap(left, right); |
e440a328 | 6699 | } |
6700 | ||
6701 | // The right operand is not an interface. We need to take its | |
6702 | // address if it is not a pointer. | |
ceeb12d7 | 6703 | Expression* pointer_arg = NULL; |
e440a328 | 6704 | if (right_type->points_to() != NULL) |
2387f644 | 6705 | pointer_arg = right; |
e440a328 | 6706 | else |
6707 | { | |
2387f644 | 6708 | go_assert(right->is_addressable()); |
6709 | pointer_arg = Expression::make_unary(OPERATOR_AND, right, | |
ceeb12d7 | 6710 | location); |
e440a328 | 6711 | } |
e440a328 | 6712 | |
2387f644 | 6713 | Expression* descriptor = |
6714 | Expression::make_type_descriptor(right_type, location); | |
6715 | left = | |
ceeb12d7 | 6716 | Runtime::make_call((left_type->interface_type()->is_empty() |
6098d6cb | 6717 | ? Runtime::EFACEVALEQ |
6718 | : Runtime::IFACEVALEQ), | |
2387f644 | 6719 | location, 3, left, descriptor, |
ceeb12d7 | 6720 | pointer_arg); |
6098d6cb | 6721 | go_assert(op == OPERATOR_EQEQ || op == OPERATOR_NOTEQ); |
6722 | right = Expression::make_boolean(true, location); | |
e440a328 | 6723 | } |
6724 | else if (left_type->interface_type() != NULL | |
6725 | && right_type->interface_type() != NULL) | |
6726 | { | |
ceeb12d7 | 6727 | Runtime::Function compare_function; |
739bad04 | 6728 | if (left_type->interface_type()->is_empty() |
6729 | && right_type->interface_type()->is_empty()) | |
6098d6cb | 6730 | compare_function = Runtime::EFACEEQ; |
739bad04 | 6731 | else if (!left_type->interface_type()->is_empty() |
6732 | && !right_type->interface_type()->is_empty()) | |
6098d6cb | 6733 | compare_function = Runtime::IFACEEQ; |
739bad04 | 6734 | else |
6735 | { | |
6736 | if (left_type->interface_type()->is_empty()) | |
6737 | { | |
739bad04 | 6738 | std::swap(left_type, right_type); |
2387f644 | 6739 | std::swap(left, right); |
739bad04 | 6740 | } |
c484d925 | 6741 | go_assert(!left_type->interface_type()->is_empty()); |
6742 | go_assert(right_type->interface_type()->is_empty()); | |
6098d6cb | 6743 | compare_function = Runtime::IFACEEFACEEQ; |
739bad04 | 6744 | } |
6745 | ||
2387f644 | 6746 | left = Runtime::make_call(compare_function, location, 2, left, right); |
6098d6cb | 6747 | go_assert(op == OPERATOR_EQEQ || op == OPERATOR_NOTEQ); |
6748 | right = Expression::make_boolean(true, location); | |
e440a328 | 6749 | } |
6750 | ||
6751 | if (left_type->is_nil_type() | |
6752 | && (op == OPERATOR_EQEQ || op == OPERATOR_NOTEQ)) | |
6753 | { | |
6754 | std::swap(left_type, right_type); | |
2387f644 | 6755 | std::swap(left, right); |
e440a328 | 6756 | } |
6757 | ||
6758 | if (right_type->is_nil_type()) | |
6759 | { | |
2387f644 | 6760 | right = Expression::make_nil(location); |
e440a328 | 6761 | if (left_type->array_type() != NULL |
6762 | && left_type->array_type()->length() == NULL) | |
6763 | { | |
6764 | Array_type* at = left_type->array_type(); | |
44dbe1d7 | 6765 | bool is_lvalue = false; |
6766 | left = at->get_value_pointer(context->gogo(), left, is_lvalue); | |
e440a328 | 6767 | } |
6768 | else if (left_type->interface_type() != NULL) | |
6769 | { | |
6770 | // An interface is nil if the first field is nil. | |
2387f644 | 6771 | left = Expression::make_field_reference(left, 0, location); |
e440a328 | 6772 | } |
6773 | } | |
6774 | ||
ea664253 | 6775 | Bexpression* left_bexpr = left->get_backend(context); |
6776 | Bexpression* right_bexpr = right->get_backend(context); | |
e90c9dfc | 6777 | |
a32698ee | 6778 | Gogo* gogo = context->gogo(); |
6779 | Bexpression* ret = gogo->backend()->binary_expression(op, left_bexpr, | |
6780 | right_bexpr, location); | |
6781 | if (result_type != NULL) | |
6782 | ret = gogo->backend()->convert_expression(result_type->get_backend(gogo), | |
6783 | ret, location); | |
e440a328 | 6784 | return ret; |
6785 | } | |
6786 | ||
736a16ba | 6787 | // Class String_concat_expression. |
6788 | ||
6789 | bool | |
6790 | String_concat_expression::do_is_constant() const | |
6791 | { | |
6792 | for (Expression_list::const_iterator pe = this->exprs_->begin(); | |
6793 | pe != this->exprs_->end(); | |
6794 | ++pe) | |
6795 | { | |
6796 | if (!(*pe)->is_constant()) | |
6797 | return false; | |
6798 | } | |
6799 | return true; | |
6800 | } | |
6801 | ||
6802 | bool | |
3ae06f68 | 6803 | String_concat_expression::do_is_static_initializer() const |
736a16ba | 6804 | { |
6805 | for (Expression_list::const_iterator pe = this->exprs_->begin(); | |
6806 | pe != this->exprs_->end(); | |
6807 | ++pe) | |
6808 | { | |
3ae06f68 | 6809 | if (!(*pe)->is_static_initializer()) |
736a16ba | 6810 | return false; |
6811 | } | |
6812 | return true; | |
6813 | } | |
6814 | ||
6815 | Type* | |
6816 | String_concat_expression::do_type() | |
6817 | { | |
6818 | Type* t = this->exprs_->front()->type(); | |
6819 | Expression_list::iterator pe = this->exprs_->begin(); | |
6820 | ++pe; | |
6821 | for (; pe != this->exprs_->end(); ++pe) | |
6822 | { | |
6823 | Type* t1; | |
6824 | if (!Binary_expression::operation_type(OPERATOR_PLUS, t, | |
6825 | (*pe)->type(), | |
6826 | &t1)) | |
6827 | return Type::make_error_type(); | |
6828 | t = t1; | |
6829 | } | |
6830 | return t; | |
6831 | } | |
6832 | ||
6833 | void | |
6834 | String_concat_expression::do_determine_type(const Type_context* context) | |
6835 | { | |
6836 | Type_context subcontext(*context); | |
6837 | for (Expression_list::iterator pe = this->exprs_->begin(); | |
6838 | pe != this->exprs_->end(); | |
6839 | ++pe) | |
6840 | { | |
6841 | Type* t = (*pe)->type(); | |
6842 | if (!t->is_abstract()) | |
6843 | { | |
6844 | subcontext.type = t; | |
6845 | break; | |
6846 | } | |
6847 | } | |
6848 | if (subcontext.type == NULL) | |
6849 | subcontext.type = this->exprs_->front()->type(); | |
6850 | for (Expression_list::iterator pe = this->exprs_->begin(); | |
6851 | pe != this->exprs_->end(); | |
6852 | ++pe) | |
6853 | (*pe)->determine_type(&subcontext); | |
6854 | } | |
6855 | ||
6856 | void | |
6857 | String_concat_expression::do_check_types(Gogo*) | |
6858 | { | |
6859 | if (this->is_error_expression()) | |
6860 | return; | |
6861 | Type* t = this->exprs_->front()->type(); | |
6862 | if (t->is_error()) | |
6863 | { | |
6864 | this->set_is_error(); | |
6865 | return; | |
6866 | } | |
6867 | Expression_list::iterator pe = this->exprs_->begin(); | |
6868 | ++pe; | |
6869 | for (; pe != this->exprs_->end(); ++pe) | |
6870 | { | |
6871 | Type* t1 = (*pe)->type(); | |
6872 | if (!Type::are_compatible_for_binop(t, t1)) | |
6873 | { | |
6874 | this->report_error("incompatible types in binary expression"); | |
6875 | return; | |
6876 | } | |
6877 | if (!Binary_expression::check_operator_type(OPERATOR_PLUS, t, t1, | |
6878 | this->location())) | |
6879 | { | |
6880 | this->set_is_error(); | |
6881 | return; | |
6882 | } | |
6883 | } | |
6884 | } | |
6885 | ||
6886 | Expression* | |
6887 | String_concat_expression::do_flatten(Gogo*, Named_object*, | |
6888 | Statement_inserter*) | |
6889 | { | |
6890 | if (this->is_error_expression()) | |
6891 | return this; | |
6892 | Location loc = this->location(); | |
6893 | Type* type = this->type(); | |
6894 | Expression* nil_arg = Expression::make_nil(loc); | |
6895 | Expression* call; | |
6896 | switch (this->exprs_->size()) | |
6897 | { | |
6898 | case 0: case 1: | |
6899 | go_unreachable(); | |
6900 | ||
6901 | case 2: case 3: case 4: case 5: | |
6902 | { | |
6903 | Expression* len = Expression::make_integer_ul(this->exprs_->size(), | |
6904 | NULL, loc); | |
6905 | Array_type* arg_type = Type::make_array_type(type, len); | |
6906 | arg_type->set_is_array_incomparable(); | |
6907 | Expression* arg = | |
6908 | Expression::make_array_composite_literal(arg_type, this->exprs_, | |
6909 | loc); | |
6910 | Runtime::Function code; | |
6911 | switch (this->exprs_->size()) | |
6912 | { | |
6913 | default: | |
6914 | go_unreachable(); | |
6915 | case 2: | |
6916 | code = Runtime::CONCATSTRING2; | |
6917 | break; | |
6918 | case 3: | |
6919 | code = Runtime::CONCATSTRING3; | |
6920 | break; | |
6921 | case 4: | |
6922 | code = Runtime::CONCATSTRING4; | |
6923 | break; | |
6924 | case 5: | |
6925 | code = Runtime::CONCATSTRING5; | |
6926 | break; | |
6927 | } | |
6928 | call = Runtime::make_call(code, loc, 2, nil_arg, arg); | |
6929 | } | |
6930 | break; | |
6931 | ||
6932 | default: | |
6933 | { | |
6934 | Type* arg_type = Type::make_array_type(type, NULL); | |
6935 | Slice_construction_expression* sce = | |
6936 | Expression::make_slice_composite_literal(arg_type, this->exprs_, | |
6937 | loc); | |
6938 | sce->set_storage_does_not_escape(); | |
6939 | call = Runtime::make_call(Runtime::CONCATSTRINGS, loc, 2, nil_arg, | |
6940 | sce); | |
6941 | } | |
6942 | break; | |
6943 | } | |
6944 | ||
6945 | return Expression::make_cast(type, call, loc); | |
6946 | } | |
6947 | ||
6948 | void | |
6949 | String_concat_expression::do_dump_expression( | |
6950 | Ast_dump_context* ast_dump_context) const | |
6951 | { | |
6952 | ast_dump_context->ostream() << "concat("; | |
6953 | ast_dump_context->dump_expression_list(this->exprs_, false); | |
6954 | ast_dump_context->ostream() << ")"; | |
6955 | } | |
6956 | ||
6957 | Expression* | |
6958 | Expression::make_string_concat(Expression_list* exprs) | |
6959 | { | |
6960 | return new String_concat_expression(exprs); | |
6961 | } | |
6962 | ||
e440a328 | 6963 | // Class Bound_method_expression. |
6964 | ||
6965 | // Traversal. | |
6966 | ||
6967 | int | |
6968 | Bound_method_expression::do_traverse(Traverse* traverse) | |
6969 | { | |
e0659c9e | 6970 | return Expression::traverse(&this->expr_, traverse); |
e440a328 | 6971 | } |
6972 | ||
6973 | // Return the type of a bound method expression. The type of this | |
0afbb937 | 6974 | // object is simply the type of the method with no receiver. |
e440a328 | 6975 | |
6976 | Type* | |
6977 | Bound_method_expression::do_type() | |
6978 | { | |
0afbb937 | 6979 | Named_object* fn = this->method_->named_object(); |
6980 | Function_type* fntype; | |
6981 | if (fn->is_function()) | |
6982 | fntype = fn->func_value()->type(); | |
6983 | else if (fn->is_function_declaration()) | |
6984 | fntype = fn->func_declaration_value()->type(); | |
e0659c9e | 6985 | else |
6986 | return Type::make_error_type(); | |
0afbb937 | 6987 | return fntype->copy_without_receiver(); |
e440a328 | 6988 | } |
6989 | ||
6990 | // Determine the types of a method expression. | |
6991 | ||
6992 | void | |
6993 | Bound_method_expression::do_determine_type(const Type_context*) | |
6994 | { | |
0afbb937 | 6995 | Named_object* fn = this->method_->named_object(); |
6996 | Function_type* fntype; | |
6997 | if (fn->is_function()) | |
6998 | fntype = fn->func_value()->type(); | |
6999 | else if (fn->is_function_declaration()) | |
7000 | fntype = fn->func_declaration_value()->type(); | |
7001 | else | |
7002 | fntype = NULL; | |
e440a328 | 7003 | if (fntype == NULL || !fntype->is_method()) |
7004 | this->expr_->determine_type_no_context(); | |
7005 | else | |
7006 | { | |
7007 | Type_context subcontext(fntype->receiver()->type(), false); | |
7008 | this->expr_->determine_type(&subcontext); | |
7009 | } | |
7010 | } | |
7011 | ||
7012 | // Check the types of a method expression. | |
7013 | ||
7014 | void | |
7015 | Bound_method_expression::do_check_types(Gogo*) | |
7016 | { | |
0afbb937 | 7017 | Named_object* fn = this->method_->named_object(); |
7018 | if (!fn->is_function() && !fn->is_function_declaration()) | |
7019 | { | |
7020 | this->report_error(_("object is not a method")); | |
7021 | return; | |
7022 | } | |
7023 | ||
7024 | Function_type* fntype; | |
7025 | if (fn->is_function()) | |
7026 | fntype = fn->func_value()->type(); | |
7027 | else if (fn->is_function_declaration()) | |
7028 | fntype = fn->func_declaration_value()->type(); | |
e440a328 | 7029 | else |
0afbb937 | 7030 | go_unreachable(); |
7031 | Type* rtype = fntype->receiver()->type()->deref(); | |
7032 | Type* etype = (this->expr_type_ != NULL | |
7033 | ? this->expr_type_ | |
7034 | : this->expr_->type()); | |
7035 | etype = etype->deref(); | |
3a522dcc | 7036 | if (!Type::are_identical(rtype, etype, Type::COMPARE_TAGS, NULL)) |
0afbb937 | 7037 | this->report_error(_("method type does not match object type")); |
7038 | } | |
7039 | ||
7040 | // If a bound method expression is not simply called, then it is | |
7041 | // represented as a closure. The closure will hold a single variable, | |
7042 | // the receiver to pass to the method. The function will be a simple | |
7043 | // thunk that pulls that value from the closure and calls the method | |
7044 | // with the remaining arguments. | |
7045 | // | |
7046 | // Because method values are not common, we don't build all thunks for | |
7047 | // every methods, but instead only build them as we need them. In | |
7048 | // particular, we even build them on demand for methods defined in | |
7049 | // other packages. | |
7050 | ||
7051 | Bound_method_expression::Method_value_thunks | |
7052 | Bound_method_expression::method_value_thunks; | |
7053 | ||
7054 | // Find or create the thunk for METHOD. | |
7055 | ||
7056 | Named_object* | |
7057 | Bound_method_expression::create_thunk(Gogo* gogo, const Method* method, | |
7058 | Named_object* fn) | |
7059 | { | |
7060 | std::pair<Named_object*, Named_object*> val(fn, NULL); | |
7061 | std::pair<Method_value_thunks::iterator, bool> ins = | |
7062 | Bound_method_expression::method_value_thunks.insert(val); | |
7063 | if (!ins.second) | |
7064 | { | |
7065 | // We have seen this method before. | |
7066 | go_assert(ins.first->second != NULL); | |
7067 | return ins.first->second; | |
7068 | } | |
7069 | ||
7070 | Location loc = fn->location(); | |
7071 | ||
7072 | Function_type* orig_fntype; | |
7073 | if (fn->is_function()) | |
7074 | orig_fntype = fn->func_value()->type(); | |
7075 | else if (fn->is_function_declaration()) | |
7076 | orig_fntype = fn->func_declaration_value()->type(); | |
7077 | else | |
7078 | orig_fntype = NULL; | |
7079 | ||
7080 | if (orig_fntype == NULL || !orig_fntype->is_method()) | |
e440a328 | 7081 | { |
13f2fdb8 | 7082 | ins.first->second = |
7083 | Named_object::make_erroneous_name(gogo->thunk_name()); | |
0afbb937 | 7084 | return ins.first->second; |
e440a328 | 7085 | } |
0afbb937 | 7086 | |
7087 | Struct_field_list* sfl = new Struct_field_list(); | |
f8bdf81a | 7088 | // The type here is wrong--it should be the C function type. But it |
7089 | // doesn't really matter. | |
0afbb937 | 7090 | Type* vt = Type::make_pointer_type(Type::make_void_type()); |
13f2fdb8 | 7091 | sfl->push_back(Struct_field(Typed_identifier("fn", vt, loc))); |
7092 | sfl->push_back(Struct_field(Typed_identifier("val", | |
0afbb937 | 7093 | orig_fntype->receiver()->type(), |
7094 | loc))); | |
6bf4793c | 7095 | Struct_type* st = Type::make_struct_type(sfl, loc); |
7096 | st->set_is_struct_incomparable(); | |
7097 | Type* closure_type = Type::make_pointer_type(st); | |
0afbb937 | 7098 | |
f8bdf81a | 7099 | Function_type* new_fntype = orig_fntype->copy_with_names(); |
0afbb937 | 7100 | |
13f2fdb8 | 7101 | std::string thunk_name = gogo->thunk_name(); |
da244e59 | 7102 | Named_object* new_no = gogo->start_function(thunk_name, new_fntype, |
0afbb937 | 7103 | false, loc); |
7104 | ||
f8bdf81a | 7105 | Variable* cvar = new Variable(closure_type, NULL, false, false, false, loc); |
7106 | cvar->set_is_used(); | |
1ecc6157 | 7107 | cvar->set_is_closure(); |
da244e59 | 7108 | Named_object* cp = Named_object::make_variable("$closure" + thunk_name, |
7109 | NULL, cvar); | |
f8bdf81a | 7110 | new_no->func_value()->set_closure_var(cp); |
0afbb937 | 7111 | |
f8bdf81a | 7112 | gogo->start_block(loc); |
0afbb937 | 7113 | |
7114 | // Field 0 of the closure is the function code pointer, field 1 is | |
7115 | // the value on which to invoke the method. | |
7116 | Expression* arg = Expression::make_var_reference(cp, loc); | |
f614ea8b | 7117 | arg = Expression::make_dereference(arg, NIL_CHECK_NOT_NEEDED, loc); |
0afbb937 | 7118 | arg = Expression::make_field_reference(arg, 1, loc); |
7119 | ||
7120 | Expression* bme = Expression::make_bound_method(arg, method, fn, loc); | |
7121 | ||
7122 | const Typed_identifier_list* orig_params = orig_fntype->parameters(); | |
7123 | Expression_list* args; | |
7124 | if (orig_params == NULL || orig_params->empty()) | |
7125 | args = NULL; | |
7126 | else | |
7127 | { | |
7128 | const Typed_identifier_list* new_params = new_fntype->parameters(); | |
7129 | args = new Expression_list(); | |
7130 | for (Typed_identifier_list::const_iterator p = new_params->begin(); | |
f8bdf81a | 7131 | p != new_params->end(); |
0afbb937 | 7132 | ++p) |
7133 | { | |
7134 | Named_object* p_no = gogo->lookup(p->name(), NULL); | |
7135 | go_assert(p_no != NULL | |
7136 | && p_no->is_variable() | |
7137 | && p_no->var_value()->is_parameter()); | |
7138 | args->push_back(Expression::make_var_reference(p_no, loc)); | |
7139 | } | |
7140 | } | |
7141 | ||
7142 | Call_expression* call = Expression::make_call(bme, args, | |
7143 | orig_fntype->is_varargs(), | |
7144 | loc); | |
7145 | call->set_varargs_are_lowered(); | |
7146 | ||
7147 | Statement* s = Statement::make_return_from_call(call, loc); | |
7148 | gogo->add_statement(s); | |
7149 | Block* b = gogo->finish_block(loc); | |
7150 | gogo->add_block(b, loc); | |
7151 | gogo->lower_block(new_no, b); | |
a32698ee | 7152 | gogo->flatten_block(new_no, b); |
0afbb937 | 7153 | gogo->finish_function(loc); |
7154 | ||
7155 | ins.first->second = new_no; | |
7156 | return new_no; | |
7157 | } | |
7158 | ||
7159 | // Return an expression to check *REF for nil while dereferencing | |
7160 | // according to FIELD_INDEXES. Update *REF to build up the field | |
7161 | // reference. This is a static function so that we don't have to | |
7162 | // worry about declaring Field_indexes in expressions.h. | |
7163 | ||
7164 | static Expression* | |
7165 | bme_check_nil(const Method::Field_indexes* field_indexes, Location loc, | |
7166 | Expression** ref) | |
7167 | { | |
7168 | if (field_indexes == NULL) | |
7169 | return Expression::make_boolean(false, loc); | |
7170 | Expression* cond = bme_check_nil(field_indexes->next, loc, ref); | |
7171 | Struct_type* stype = (*ref)->type()->deref()->struct_type(); | |
7172 | go_assert(stype != NULL | |
7173 | && field_indexes->field_index < stype->field_count()); | |
7174 | if ((*ref)->type()->struct_type() == NULL) | |
7175 | { | |
7176 | go_assert((*ref)->type()->points_to() != NULL); | |
7177 | Expression* n = Expression::make_binary(OPERATOR_EQEQ, *ref, | |
7178 | Expression::make_nil(loc), | |
7179 | loc); | |
7180 | cond = Expression::make_binary(OPERATOR_OROR, cond, n, loc); | |
f614ea8b | 7181 | *ref = Expression::make_dereference(*ref, Expression::NIL_CHECK_DEFAULT, |
7182 | loc); | |
0afbb937 | 7183 | go_assert((*ref)->type()->struct_type() == stype); |
7184 | } | |
7185 | *ref = Expression::make_field_reference(*ref, field_indexes->field_index, | |
7186 | loc); | |
7187 | return cond; | |
e440a328 | 7188 | } |
7189 | ||
cd39797e | 7190 | // Flatten a method value into a struct with nil checks. We can't do |
7191 | // this in the lowering phase, because if the method value is called | |
7192 | // directly we don't need a thunk. That case will have been handled | |
7193 | // by Call_expression::do_lower, so if we get here then we do need a | |
7194 | // thunk. | |
e440a328 | 7195 | |
cd39797e | 7196 | Expression* |
7197 | Bound_method_expression::do_flatten(Gogo* gogo, Named_object*, | |
7198 | Statement_inserter* inserter) | |
e440a328 | 7199 | { |
cd39797e | 7200 | Location loc = this->location(); |
7201 | ||
7202 | Named_object* thunk = Bound_method_expression::create_thunk(gogo, | |
0afbb937 | 7203 | this->method_, |
7204 | this->function_); | |
7205 | if (thunk->is_erroneous()) | |
7206 | { | |
7207 | go_assert(saw_errors()); | |
cd39797e | 7208 | return Expression::make_error(loc); |
0afbb937 | 7209 | } |
7210 | ||
cd39797e | 7211 | // Force the expression into a variable. This is only necessary if |
7212 | // we are going to do nil checks below, but it's easy enough to | |
7213 | // always do it. | |
7214 | Expression* expr = this->expr_; | |
7215 | if (!expr->is_variable()) | |
7216 | { | |
7217 | Temporary_statement* etemp = Statement::make_temporary(NULL, expr, loc); | |
7218 | inserter->insert(etemp); | |
7219 | expr = Expression::make_temporary_reference(etemp, loc); | |
7220 | } | |
0afbb937 | 7221 | |
7222 | // If the method expects a value, and we have a pointer, we need to | |
7223 | // dereference the pointer. | |
7224 | ||
7225 | Named_object* fn = this->method_->named_object(); | |
cd39797e | 7226 | Function_type *fntype; |
0afbb937 | 7227 | if (fn->is_function()) |
7228 | fntype = fn->func_value()->type(); | |
7229 | else if (fn->is_function_declaration()) | |
7230 | fntype = fn->func_declaration_value()->type(); | |
7231 | else | |
7232 | go_unreachable(); | |
7233 | ||
cd39797e | 7234 | Expression* val = expr; |
0afbb937 | 7235 | if (fntype->receiver()->type()->points_to() == NULL |
7236 | && val->type()->points_to() != NULL) | |
f614ea8b | 7237 | val = Expression::make_dereference(val, NIL_CHECK_DEFAULT, loc); |
0afbb937 | 7238 | |
7239 | // Note that we are ignoring this->expr_type_ here. The thunk will | |
7240 | // expect a closure whose second field has type this->expr_type_ (if | |
7241 | // that is not NULL). We are going to pass it a closure whose | |
7242 | // second field has type this->expr_->type(). Since | |
7243 | // this->expr_type_ is only not-NULL for pointer types, we can get | |
7244 | // away with this. | |
7245 | ||
7246 | Struct_field_list* fields = new Struct_field_list(); | |
13f2fdb8 | 7247 | fields->push_back(Struct_field(Typed_identifier("fn", |
0afbb937 | 7248 | thunk->func_value()->type(), |
7249 | loc))); | |
13f2fdb8 | 7250 | fields->push_back(Struct_field(Typed_identifier("val", val->type(), loc))); |
0afbb937 | 7251 | Struct_type* st = Type::make_struct_type(fields, loc); |
6bf4793c | 7252 | st->set_is_struct_incomparable(); |
0afbb937 | 7253 | |
7254 | Expression_list* vals = new Expression_list(); | |
7255 | vals->push_back(Expression::make_func_code_reference(thunk, loc)); | |
7256 | vals->push_back(val); | |
7257 | ||
7258 | Expression* ret = Expression::make_struct_composite_literal(st, vals, loc); | |
c1177ba4 | 7259 | ret = Expression::make_heap_expression(ret, loc); |
0afbb937 | 7260 | |
c1177ba4 | 7261 | Node* n = Node::make_node(this); |
7262 | if ((n->encoding() & ESCAPE_MASK) == Node::ESCAPE_NONE) | |
7263 | ret->heap_expression()->set_allocate_on_stack(); | |
7264 | else if (gogo->compiling_runtime() && gogo->package_name() == "runtime") | |
7265 | go_error_at(loc, "%s escapes to heap, not allowed in runtime", | |
7266 | n->ast_format(gogo).c_str()); | |
cd39797e | 7267 | |
7268 | // If necessary, check whether the expression or any embedded | |
7269 | // pointers are nil. | |
0afbb937 | 7270 | |
df7ef1fd | 7271 | Expression* nil_check = NULL; |
0afbb937 | 7272 | if (this->method_->field_indexes() != NULL) |
7273 | { | |
0afbb937 | 7274 | Expression* ref = expr; |
7275 | nil_check = bme_check_nil(this->method_->field_indexes(), loc, &ref); | |
7276 | expr = ref; | |
7277 | } | |
7278 | ||
7279 | if (this->method_->is_value_method() && expr->type()->points_to() != NULL) | |
7280 | { | |
7281 | Expression* n = Expression::make_binary(OPERATOR_EQEQ, expr, | |
7282 | Expression::make_nil(loc), | |
7283 | loc); | |
7284 | if (nil_check == NULL) | |
7285 | nil_check = n; | |
7286 | else | |
7287 | nil_check = Expression::make_binary(OPERATOR_OROR, nil_check, n, loc); | |
7288 | } | |
7289 | ||
7290 | if (nil_check != NULL) | |
7291 | { | |
cd39797e | 7292 | Expression* crash = gogo->runtime_error(RUNTIME_ERROR_NIL_DEREFERENCE, |
7293 | loc); | |
7294 | // Fix the type of the conditional expression by pretending to | |
7295 | // evaluate to RET either way through the conditional. | |
7296 | crash = Expression::make_compound(crash, ret, loc); | |
7297 | ret = Expression::make_conditional(nil_check, crash, ret, loc); | |
7298 | } | |
7299 | ||
7300 | // RET is a pointer to a struct, but we want a function type. | |
7301 | ret = Expression::make_unsafe_cast(this->type(), ret, loc); | |
7302 | ||
7303 | return ret; | |
e440a328 | 7304 | } |
7305 | ||
d751bb78 | 7306 | // Dump ast representation of a bound method expression. |
7307 | ||
7308 | void | |
7309 | Bound_method_expression::do_dump_expression(Ast_dump_context* ast_dump_context) | |
7310 | const | |
7311 | { | |
7312 | if (this->expr_type_ != NULL) | |
7313 | ast_dump_context->ostream() << "("; | |
7314 | ast_dump_context->dump_expression(this->expr_); | |
7315 | if (this->expr_type_ != NULL) | |
7316 | { | |
7317 | ast_dump_context->ostream() << ":"; | |
7318 | ast_dump_context->dump_type(this->expr_type_); | |
7319 | ast_dump_context->ostream() << ")"; | |
7320 | } | |
7321 | ||
0afbb937 | 7322 | ast_dump_context->ostream() << "." << this->function_->name(); |
d751bb78 | 7323 | } |
7324 | ||
e440a328 | 7325 | // Make a method expression. |
7326 | ||
7327 | Bound_method_expression* | |
0afbb937 | 7328 | Expression::make_bound_method(Expression* expr, const Method* method, |
7329 | Named_object* function, Location location) | |
e440a328 | 7330 | { |
0afbb937 | 7331 | return new Bound_method_expression(expr, method, function, location); |
e440a328 | 7332 | } |
7333 | ||
7334 | // Class Builtin_call_expression. This is used for a call to a | |
7335 | // builtin function. | |
7336 | ||
e440a328 | 7337 | Builtin_call_expression::Builtin_call_expression(Gogo* gogo, |
7338 | Expression* fn, | |
7339 | Expression_list* args, | |
7340 | bool is_varargs, | |
b13c66cd | 7341 | Location location) |
e440a328 | 7342 | : Call_expression(fn, args, is_varargs, location), |
6334270b | 7343 | gogo_(gogo), code_(BUILTIN_INVALID), seen_(false), |
7344 | recover_arg_is_set_(false) | |
e440a328 | 7345 | { |
7346 | Func_expression* fnexp = this->fn()->func_expression(); | |
79651b1f | 7347 | if (fnexp == NULL) |
7348 | { | |
7349 | this->code_ = BUILTIN_INVALID; | |
7350 | return; | |
7351 | } | |
e440a328 | 7352 | const std::string& name(fnexp->named_object()->name()); |
7353 | if (name == "append") | |
7354 | this->code_ = BUILTIN_APPEND; | |
7355 | else if (name == "cap") | |
7356 | this->code_ = BUILTIN_CAP; | |
7357 | else if (name == "close") | |
7358 | this->code_ = BUILTIN_CLOSE; | |
48080209 | 7359 | else if (name == "complex") |
7360 | this->code_ = BUILTIN_COMPLEX; | |
e440a328 | 7361 | else if (name == "copy") |
7362 | this->code_ = BUILTIN_COPY; | |
1cce762f | 7363 | else if (name == "delete") |
7364 | this->code_ = BUILTIN_DELETE; | |
e440a328 | 7365 | else if (name == "imag") |
7366 | this->code_ = BUILTIN_IMAG; | |
7367 | else if (name == "len") | |
7368 | this->code_ = BUILTIN_LEN; | |
7369 | else if (name == "make") | |
7370 | this->code_ = BUILTIN_MAKE; | |
7371 | else if (name == "new") | |
7372 | this->code_ = BUILTIN_NEW; | |
7373 | else if (name == "panic") | |
7374 | this->code_ = BUILTIN_PANIC; | |
7375 | else if (name == "print") | |
7376 | this->code_ = BUILTIN_PRINT; | |
7377 | else if (name == "println") | |
7378 | this->code_ = BUILTIN_PRINTLN; | |
7379 | else if (name == "real") | |
7380 | this->code_ = BUILTIN_REAL; | |
7381 | else if (name == "recover") | |
7382 | this->code_ = BUILTIN_RECOVER; | |
7383 | else if (name == "Alignof") | |
7384 | this->code_ = BUILTIN_ALIGNOF; | |
7385 | else if (name == "Offsetof") | |
7386 | this->code_ = BUILTIN_OFFSETOF; | |
7387 | else if (name == "Sizeof") | |
7388 | this->code_ = BUILTIN_SIZEOF; | |
7389 | else | |
c3e6f413 | 7390 | go_unreachable(); |
e440a328 | 7391 | } |
7392 | ||
7393 | // Return whether this is a call to recover. This is a virtual | |
7394 | // function called from the parent class. | |
7395 | ||
7396 | bool | |
7397 | Builtin_call_expression::do_is_recover_call() const | |
7398 | { | |
7399 | if (this->classification() == EXPRESSION_ERROR) | |
7400 | return false; | |
7401 | return this->code_ == BUILTIN_RECOVER; | |
7402 | } | |
7403 | ||
7404 | // Set the argument for a call to recover. | |
7405 | ||
7406 | void | |
7407 | Builtin_call_expression::do_set_recover_arg(Expression* arg) | |
7408 | { | |
7409 | const Expression_list* args = this->args(); | |
c484d925 | 7410 | go_assert(args == NULL || args->empty()); |
e440a328 | 7411 | Expression_list* new_args = new Expression_list(); |
7412 | new_args->push_back(arg); | |
7413 | this->set_args(new_args); | |
6334270b | 7414 | this->recover_arg_is_set_ = true; |
e440a328 | 7415 | } |
7416 | ||
e440a328 | 7417 | // Lower a builtin call expression. This turns new and make into |
7418 | // specific expressions. We also convert to a constant if we can. | |
7419 | ||
7420 | Expression* | |
321e5ad2 | 7421 | Builtin_call_expression::do_lower(Gogo*, Named_object* function, |
ceeb4318 | 7422 | Statement_inserter* inserter, int) |
e440a328 | 7423 | { |
79651b1f | 7424 | if (this->is_error_expression()) |
a9182619 | 7425 | return this; |
7426 | ||
b13c66cd | 7427 | Location loc = this->location(); |
1cce762f | 7428 | |
a8725655 | 7429 | if (this->is_varargs() && this->code_ != BUILTIN_APPEND) |
7430 | { | |
7431 | this->report_error(_("invalid use of %<...%> with builtin function")); | |
1cce762f | 7432 | return Expression::make_error(loc); |
a8725655 | 7433 | } |
7434 | ||
393ba00b | 7435 | if (this->code_ == BUILTIN_OFFSETOF) |
7436 | { | |
7437 | Expression* arg = this->one_arg(); | |
12e69faa | 7438 | |
7439 | if (arg->bound_method_expression() != NULL | |
7440 | || arg->interface_field_reference_expression() != NULL) | |
7441 | { | |
7442 | this->report_error(_("invalid use of method value as argument " | |
7443 | "of Offsetof")); | |
7444 | return this; | |
7445 | } | |
7446 | ||
393ba00b | 7447 | Field_reference_expression* farg = arg->field_reference_expression(); |
7448 | while (farg != NULL) | |
7449 | { | |
7450 | if (!farg->implicit()) | |
7451 | break; | |
7452 | // When the selector refers to an embedded field, | |
7453 | // it must not be reached through pointer indirections. | |
7454 | if (farg->expr()->deref() != farg->expr()) | |
7455 | { | |
12e69faa | 7456 | this->report_error(_("argument of Offsetof implies " |
7457 | "indirection of an embedded field")); | |
393ba00b | 7458 | return this; |
7459 | } | |
7460 | // Go up until we reach the original base. | |
7461 | farg = farg->expr()->field_reference_expression(); | |
7462 | } | |
7463 | } | |
7464 | ||
1cce762f | 7465 | if (this->is_constant()) |
e440a328 | 7466 | { |
0c77715b | 7467 | Numeric_constant nc; |
7468 | if (this->numeric_constant_value(&nc)) | |
7469 | return nc.expression(loc); | |
e440a328 | 7470 | } |
1cce762f | 7471 | |
7472 | switch (this->code_) | |
e440a328 | 7473 | { |
1cce762f | 7474 | default: |
7475 | break; | |
7476 | ||
7477 | case BUILTIN_NEW: | |
7478 | { | |
7479 | const Expression_list* args = this->args(); | |
7480 | if (args == NULL || args->size() < 1) | |
7481 | this->report_error(_("not enough arguments")); | |
7482 | else if (args->size() > 1) | |
7483 | this->report_error(_("too many arguments")); | |
7484 | else | |
7485 | { | |
7486 | Expression* arg = args->front(); | |
7487 | if (!arg->is_type_expression()) | |
7488 | { | |
631d5788 | 7489 | go_error_at(arg->location(), "expected type"); |
1cce762f | 7490 | this->set_is_error(); |
7491 | } | |
7492 | else | |
7493 | return Expression::make_allocation(arg->type(), loc); | |
7494 | } | |
7495 | } | |
7496 | break; | |
7497 | ||
7498 | case BUILTIN_MAKE: | |
321e5ad2 | 7499 | return this->lower_make(inserter); |
1cce762f | 7500 | |
7501 | case BUILTIN_RECOVER: | |
e440a328 | 7502 | if (function != NULL) |
7503 | function->func_value()->set_calls_recover(); | |
7504 | else | |
7505 | { | |
7506 | // Calling recover outside of a function always returns the | |
7507 | // nil empty interface. | |
823c7e3d | 7508 | Type* eface = Type::make_empty_interface_type(loc); |
1cce762f | 7509 | return Expression::make_cast(eface, Expression::make_nil(loc), loc); |
e440a328 | 7510 | } |
1cce762f | 7511 | break; |
7512 | ||
1cce762f | 7513 | case BUILTIN_DELETE: |
7514 | { | |
7515 | // Lower to a runtime function call. | |
7516 | const Expression_list* args = this->args(); | |
7517 | if (args == NULL || args->size() < 2) | |
7518 | this->report_error(_("not enough arguments")); | |
7519 | else if (args->size() > 2) | |
7520 | this->report_error(_("too many arguments")); | |
7521 | else if (args->front()->type()->map_type() == NULL) | |
7522 | this->report_error(_("argument 1 must be a map")); | |
7523 | else | |
7524 | { | |
7525 | // Since this function returns no value it must appear in | |
7526 | // a statement by itself, so we don't have to worry about | |
7527 | // order of evaluation of values around it. Evaluate the | |
7528 | // map first to get order of evaluation right. | |
7529 | Map_type* mt = args->front()->type()->map_type(); | |
7530 | Temporary_statement* map_temp = | |
7531 | Statement::make_temporary(mt, args->front(), loc); | |
7532 | inserter->insert(map_temp); | |
7533 | ||
7534 | Temporary_statement* key_temp = | |
7535 | Statement::make_temporary(mt->key_type(), args->back(), loc); | |
7536 | inserter->insert(key_temp); | |
7537 | ||
0d5530d9 | 7538 | Expression* e1 = Expression::make_type_descriptor(mt, loc); |
7539 | Expression* e2 = Expression::make_temporary_reference(map_temp, | |
1cce762f | 7540 | loc); |
0d5530d9 | 7541 | Expression* e3 = Expression::make_temporary_reference(key_temp, |
1cce762f | 7542 | loc); |
28819633 | 7543 | |
7544 | // If the call to delete is deferred, and is in a loop, | |
7545 | // then the loop will only have a single instance of the | |
7546 | // temporary variable. Passing the address of the | |
7547 | // temporary variable here means that the deferred call | |
7548 | // will see the last value in the loop, not the current | |
7549 | // value. So for this unusual case copy the value into | |
7550 | // the heap. | |
7551 | if (!this->is_deferred()) | |
7552 | e3 = Expression::make_unary(OPERATOR_AND, e3, loc); | |
7553 | else | |
7554 | { | |
7555 | Expression* a = Expression::make_allocation(mt->key_type(), | |
7556 | loc); | |
7557 | Temporary_statement* atemp = | |
7558 | Statement::make_temporary(NULL, a, loc); | |
7559 | inserter->insert(atemp); | |
7560 | ||
7561 | a = Expression::make_temporary_reference(atemp, loc); | |
7562 | a = Expression::make_dereference(a, NIL_CHECK_NOT_NEEDED, loc); | |
7563 | Statement* s = Statement::make_assignment(a, e3, loc); | |
7564 | inserter->insert(s); | |
7565 | ||
7566 | e3 = Expression::make_temporary_reference(atemp, loc); | |
7567 | } | |
7568 | ||
1cce762f | 7569 | return Runtime::make_call(Runtime::MAPDELETE, this->location(), |
0d5530d9 | 7570 | 3, e1, e2, e3); |
1cce762f | 7571 | } |
7572 | } | |
7573 | break; | |
88b03a70 | 7574 | |
7575 | case BUILTIN_PRINT: | |
7576 | case BUILTIN_PRINTLN: | |
7577 | // Force all the arguments into temporary variables, so that we | |
7578 | // don't try to evaluate something while holding the print lock. | |
7579 | if (this->args() == NULL) | |
7580 | break; | |
7581 | for (Expression_list::iterator pa = this->args()->begin(); | |
7582 | pa != this->args()->end(); | |
7583 | ++pa) | |
7584 | { | |
493ce3ee | 7585 | if (!(*pa)->is_variable() && !(*pa)->is_constant()) |
88b03a70 | 7586 | { |
7587 | Temporary_statement* temp = | |
7588 | Statement::make_temporary(NULL, *pa, loc); | |
7589 | inserter->insert(temp); | |
7590 | *pa = Expression::make_temporary_reference(temp, loc); | |
7591 | } | |
7592 | } | |
7593 | break; | |
e440a328 | 7594 | } |
7595 | ||
7596 | return this; | |
7597 | } | |
7598 | ||
35a54f17 | 7599 | // Flatten a builtin call expression. This turns the arguments of copy and |
7600 | // append into temporary expressions. | |
7601 | ||
7602 | Expression* | |
321e5ad2 | 7603 | Builtin_call_expression::do_flatten(Gogo* gogo, Named_object* function, |
35a54f17 | 7604 | Statement_inserter* inserter) |
7605 | { | |
16cb7fec | 7606 | Location loc = this->location(); |
7607 | ||
7608 | switch (this->code_) | |
35a54f17 | 7609 | { |
16cb7fec | 7610 | default: |
7611 | break; | |
7612 | ||
7613 | case BUILTIN_APPEND: | |
d3c55148 | 7614 | return this->flatten_append(gogo, function, inserter, NULL, NULL); |
321e5ad2 | 7615 | |
16cb7fec | 7616 | case BUILTIN_COPY: |
7617 | { | |
7618 | Type* at = this->args()->front()->type(); | |
7619 | for (Expression_list::iterator pa = this->args()->begin(); | |
7620 | pa != this->args()->end(); | |
7621 | ++pa) | |
7622 | { | |
7623 | if ((*pa)->is_nil_expression()) | |
7624 | { | |
7625 | Expression* nil = Expression::make_nil(loc); | |
7626 | Expression* zero = Expression::make_integer_ul(0, NULL, loc); | |
7627 | *pa = Expression::make_slice_value(at, nil, zero, zero, loc); | |
7628 | } | |
7629 | if (!(*pa)->is_variable()) | |
7630 | { | |
7631 | Temporary_statement* temp = | |
7632 | Statement::make_temporary(NULL, *pa, loc); | |
7633 | inserter->insert(temp); | |
7634 | *pa = Expression::make_temporary_reference(temp, loc); | |
7635 | } | |
7636 | } | |
7637 | } | |
7638 | break; | |
7639 | ||
7640 | case BUILTIN_PANIC: | |
35a54f17 | 7641 | for (Expression_list::iterator pa = this->args()->begin(); |
16cb7fec | 7642 | pa != this->args()->end(); |
7643 | ++pa) | |
7644 | { | |
7645 | if (!(*pa)->is_variable() && (*pa)->type()->interface_type() != NULL) | |
55e8ba6a | 7646 | { |
16cb7fec | 7647 | Temporary_statement* temp = |
7648 | Statement::make_temporary(NULL, *pa, loc); | |
7649 | inserter->insert(temp); | |
7650 | *pa = Expression::make_temporary_reference(temp, loc); | |
55e8ba6a | 7651 | } |
16cb7fec | 7652 | } |
7739537f | 7653 | break; |
0d5530d9 | 7654 | |
7655 | case BUILTIN_LEN: | |
132ed071 | 7656 | case BUILTIN_CAP: |
321e5ad2 | 7657 | { |
7658 | Expression_list::iterator pa = this->args()->begin(); | |
7659 | if (!(*pa)->is_variable() | |
7660 | && ((*pa)->type()->map_type() != NULL | |
7661 | || (*pa)->type()->channel_type() != NULL)) | |
7662 | { | |
7663 | Temporary_statement* temp = | |
7664 | Statement::make_temporary(NULL, *pa, loc); | |
7665 | inserter->insert(temp); | |
7666 | *pa = Expression::make_temporary_reference(temp, loc); | |
7667 | } | |
7668 | } | |
7669 | break; | |
35a54f17 | 7670 | } |
16cb7fec | 7671 | |
35a54f17 | 7672 | return this; |
7673 | } | |
7674 | ||
a9182619 | 7675 | // Lower a make expression. |
7676 | ||
7677 | Expression* | |
321e5ad2 | 7678 | Builtin_call_expression::lower_make(Statement_inserter* inserter) |
a9182619 | 7679 | { |
b13c66cd | 7680 | Location loc = this->location(); |
a9182619 | 7681 | |
7682 | const Expression_list* args = this->args(); | |
7683 | if (args == NULL || args->size() < 1) | |
7684 | { | |
7685 | this->report_error(_("not enough arguments")); | |
7686 | return Expression::make_error(this->location()); | |
7687 | } | |
7688 | ||
7689 | Expression_list::const_iterator parg = args->begin(); | |
7690 | ||
7691 | Expression* first_arg = *parg; | |
7692 | if (!first_arg->is_type_expression()) | |
7693 | { | |
631d5788 | 7694 | go_error_at(first_arg->location(), "expected type"); |
a9182619 | 7695 | this->set_is_error(); |
7696 | return Expression::make_error(this->location()); | |
7697 | } | |
7698 | Type* type = first_arg->type(); | |
7699 | ||
22deed0d | 7700 | if (!type->in_heap()) |
7701 | go_error_at(first_arg->location(), | |
7702 | "can't make slice of go:notinheap type"); | |
7703 | ||
a9182619 | 7704 | bool is_slice = false; |
7705 | bool is_map = false; | |
7706 | bool is_chan = false; | |
411eb89e | 7707 | if (type->is_slice_type()) |
a9182619 | 7708 | is_slice = true; |
7709 | else if (type->map_type() != NULL) | |
7710 | is_map = true; | |
7711 | else if (type->channel_type() != NULL) | |
7712 | is_chan = true; | |
7713 | else | |
7714 | { | |
7715 | this->report_error(_("invalid type for make function")); | |
7716 | return Expression::make_error(this->location()); | |
7717 | } | |
7718 | ||
f6bc81e6 | 7719 | Type_context int_context(Type::lookup_integer_type("int"), false); |
7720 | ||
a9182619 | 7721 | ++parg; |
7722 | Expression* len_arg; | |
ccea2b36 | 7723 | bool len_small = false; |
a9182619 | 7724 | if (parg == args->end()) |
7725 | { | |
7726 | if (is_slice) | |
7727 | { | |
7728 | this->report_error(_("length required when allocating a slice")); | |
7729 | return Expression::make_error(this->location()); | |
7730 | } | |
e67508fa | 7731 | len_arg = Expression::make_integer_ul(0, NULL, loc); |
33d1d391 | 7732 | len_small = true; |
a9182619 | 7733 | } |
7734 | else | |
7735 | { | |
7736 | len_arg = *parg; | |
f6bc81e6 | 7737 | len_arg->determine_type(&int_context); |
a065edc5 | 7738 | if (len_arg->type()->integer_type() == NULL) |
7739 | { | |
7740 | go_error_at(len_arg->location(), "non-integer len argument in make"); | |
7741 | return Expression::make_error(this->location()); | |
7742 | } | |
ccea2b36 | 7743 | if (!this->check_int_value(len_arg, true, &len_small)) |
1ad00fd4 | 7744 | return Expression::make_error(this->location()); |
a9182619 | 7745 | ++parg; |
7746 | } | |
7747 | ||
7748 | Expression* cap_arg = NULL; | |
ccea2b36 | 7749 | bool cap_small = false; |
72bf0e6e | 7750 | Numeric_constant nclen; |
7751 | Numeric_constant nccap; | |
7752 | unsigned long vlen; | |
7753 | unsigned long vcap; | |
a9182619 | 7754 | if (is_slice && parg != args->end()) |
7755 | { | |
7756 | cap_arg = *parg; | |
f6bc81e6 | 7757 | cap_arg->determine_type(&int_context); |
a065edc5 | 7758 | if (cap_arg->type()->integer_type() == NULL) |
7759 | { | |
7760 | go_error_at(cap_arg->location(), "non-integer cap argument in make"); | |
7761 | return Expression::make_error(this->location()); | |
7762 | } | |
ccea2b36 | 7763 | if (!this->check_int_value(cap_arg, false, &cap_small)) |
1ad00fd4 | 7764 | return Expression::make_error(this->location()); |
7765 | ||
1ad00fd4 | 7766 | if (len_arg->numeric_constant_value(&nclen) |
7767 | && cap_arg->numeric_constant_value(&nccap) | |
7768 | && nclen.to_unsigned_long(&vlen) == Numeric_constant::NC_UL_VALID | |
7769 | && nccap.to_unsigned_long(&vcap) == Numeric_constant::NC_UL_VALID | |
7770 | && vlen > vcap) | |
a9182619 | 7771 | { |
1ad00fd4 | 7772 | this->report_error(_("len larger than cap")); |
a9182619 | 7773 | return Expression::make_error(this->location()); |
7774 | } | |
1ad00fd4 | 7775 | |
a9182619 | 7776 | ++parg; |
7777 | } | |
7778 | ||
7779 | if (parg != args->end()) | |
7780 | { | |
7781 | this->report_error(_("too many arguments to make")); | |
7782 | return Expression::make_error(this->location()); | |
7783 | } | |
7784 | ||
b13c66cd | 7785 | Location type_loc = first_arg->location(); |
a9182619 | 7786 | |
7787 | Expression* call; | |
7788 | if (is_slice) | |
7789 | { | |
d633d0fb | 7790 | Temporary_statement* len_temp = NULL; |
7791 | if (!len_arg->is_constant()) | |
7792 | { | |
7793 | len_temp = Statement::make_temporary(NULL, len_arg, loc); | |
7794 | inserter->insert(len_temp); | |
7795 | len_arg = Expression::make_temporary_reference(len_temp, loc); | |
7796 | } | |
7797 | ||
a9182619 | 7798 | if (cap_arg == NULL) |
321e5ad2 | 7799 | { |
72bf0e6e | 7800 | cap_small = len_small; |
d633d0fb | 7801 | if (len_temp == NULL) |
7802 | cap_arg = len_arg->copy(); | |
7803 | else | |
7804 | cap_arg = Expression::make_temporary_reference(len_temp, loc); | |
7805 | } | |
7806 | else if (!cap_arg->is_constant()) | |
7807 | { | |
7808 | Temporary_statement* cap_temp = Statement::make_temporary(NULL, | |
7809 | cap_arg, | |
7810 | loc); | |
7811 | inserter->insert(cap_temp); | |
7812 | cap_arg = Expression::make_temporary_reference(cap_temp, loc); | |
321e5ad2 | 7813 | } |
ccea2b36 | 7814 | |
72bf0e6e | 7815 | Type* et = type->array_type()->element_type(); |
7816 | Expression* type_arg = Expression::make_type_descriptor(et, type_loc); | |
ccea2b36 | 7817 | Runtime::Function code = Runtime::MAKESLICE; |
7818 | if (!len_small || !cap_small) | |
7819 | code = Runtime::MAKESLICE64; | |
d633d0fb | 7820 | Expression* mem = Runtime::make_call(code, loc, 3, type_arg, len_arg, |
7821 | cap_arg); | |
7822 | mem = Expression::make_unsafe_cast(Type::make_pointer_type(et), mem, | |
7823 | loc); | |
f81232c1 | 7824 | Type* int_type = Type::lookup_integer_type("int"); |
7825 | len_arg = Expression::make_cast(int_type, len_arg->copy(), loc); | |
7826 | cap_arg = Expression::make_cast(int_type, cap_arg->copy(), loc); | |
7827 | call = Expression::make_slice_value(type, mem, len_arg, cap_arg, loc); | |
a9182619 | 7828 | } |
7829 | else if (is_map) | |
321e5ad2 | 7830 | { |
7831 | Expression* type_arg = Expression::make_type_descriptor(type, type_loc); | |
33d1d391 | 7832 | if (!len_small) |
7833 | call = Runtime::make_call(Runtime::MAKEMAP64, loc, 3, type_arg, | |
7834 | len_arg, | |
7835 | Expression::make_nil(loc)); | |
7836 | else | |
7837 | { | |
7838 | Numeric_constant nclen; | |
7839 | unsigned long vlen; | |
7840 | if (len_arg->numeric_constant_value(&nclen) | |
7841 | && nclen.to_unsigned_long(&vlen) == Numeric_constant::NC_UL_VALID | |
7842 | && vlen <= Map_type::bucket_size) | |
7843 | call = Runtime::make_call(Runtime::MAKEMAP_SMALL, loc, 0); | |
7844 | else | |
7845 | call = Runtime::make_call(Runtime::MAKEMAP, loc, 3, type_arg, | |
7846 | len_arg, | |
7847 | Expression::make_nil(loc)); | |
7848 | } | |
321e5ad2 | 7849 | } |
a9182619 | 7850 | else if (is_chan) |
321e5ad2 | 7851 | { |
7852 | Expression* type_arg = Expression::make_type_descriptor(type, type_loc); | |
1423c90a | 7853 | Runtime::Function code = Runtime::MAKECHAN; |
7854 | if (!len_small) | |
7855 | code = Runtime::MAKECHAN64; | |
7856 | call = Runtime::make_call(code, loc, 2, type_arg, len_arg); | |
321e5ad2 | 7857 | } |
a9182619 | 7858 | else |
7859 | go_unreachable(); | |
7860 | ||
7861 | return Expression::make_unsafe_cast(type, call, loc); | |
7862 | } | |
7863 | ||
321e5ad2 | 7864 | // Flatten a call to the predeclared append function. We do this in |
7865 | // the flatten phase, not the lowering phase, so that we run after | |
d3c55148 | 7866 | // type checking and after order_evaluations. If ASSIGN_LHS is not |
7867 | // NULL, this append is the right-hand-side of an assignment and | |
7868 | // ASSIGN_LHS is the left-hand-side; in that case, set LHS directly | |
7869 | // rather than returning a slice. This lets us omit a write barrier | |
7870 | // in common cases like a = append(a, ...) when the slice does not | |
7871 | // need to grow. ENCLOSING is not NULL iff ASSIGN_LHS is not NULL. | |
321e5ad2 | 7872 | |
7873 | Expression* | |
7874 | Builtin_call_expression::flatten_append(Gogo* gogo, Named_object* function, | |
d3c55148 | 7875 | Statement_inserter* inserter, |
7876 | Expression* assign_lhs, | |
7877 | Block* enclosing) | |
321e5ad2 | 7878 | { |
7879 | if (this->is_error_expression()) | |
7880 | return this; | |
7881 | ||
7882 | Location loc = this->location(); | |
7883 | ||
7884 | const Expression_list* args = this->args(); | |
7885 | go_assert(args != NULL && !args->empty()); | |
7886 | ||
7887 | Type* slice_type = args->front()->type(); | |
7888 | go_assert(slice_type->is_slice_type()); | |
7889 | Type* element_type = slice_type->array_type()->element_type(); | |
7890 | ||
7891 | if (args->size() == 1) | |
7892 | { | |
7893 | // append(s) evaluates to s. | |
d3c55148 | 7894 | if (assign_lhs != NULL) |
7895 | return NULL; | |
321e5ad2 | 7896 | return args->front(); |
7897 | } | |
7898 | ||
7899 | Type* int_type = Type::lookup_integer_type("int"); | |
7900 | Type* uint_type = Type::lookup_integer_type("uint"); | |
7901 | ||
7902 | // Implementing | |
7903 | // append(s1, s2...) | |
7904 | // or | |
7905 | // append(s1, a1, a2, a3, ...) | |
7906 | ||
7907 | // s1tmp := s1 | |
7908 | Temporary_statement* s1tmp = Statement::make_temporary(NULL, args->front(), | |
7909 | loc); | |
7910 | inserter->insert(s1tmp); | |
7911 | ||
7912 | // l1tmp := len(s1tmp) | |
7913 | Named_object* lenfn = gogo->lookup_global("len"); | |
7914 | Expression* lenref = Expression::make_func_reference(lenfn, NULL, loc); | |
7915 | Expression_list* call_args = new Expression_list(); | |
7916 | call_args->push_back(Expression::make_temporary_reference(s1tmp, loc)); | |
7917 | Expression* len = Expression::make_call(lenref, call_args, false, loc); | |
7918 | gogo->lower_expression(function, inserter, &len); | |
7919 | gogo->flatten_expression(function, inserter, &len); | |
7920 | Temporary_statement* l1tmp = Statement::make_temporary(int_type, len, loc); | |
7921 | inserter->insert(l1tmp); | |
7922 | ||
7923 | Temporary_statement* s2tmp = NULL; | |
7924 | Temporary_statement* l2tmp = NULL; | |
7925 | Expression_list* add = NULL; | |
7926 | Expression* len2; | |
7927 | if (this->is_varargs()) | |
7928 | { | |
7929 | go_assert(args->size() == 2); | |
7930 | ||
7931 | // s2tmp := s2 | |
7932 | s2tmp = Statement::make_temporary(NULL, args->back(), loc); | |
7933 | inserter->insert(s2tmp); | |
7934 | ||
7935 | // l2tmp := len(s2tmp) | |
7936 | lenref = Expression::make_func_reference(lenfn, NULL, loc); | |
7937 | call_args = new Expression_list(); | |
7938 | call_args->push_back(Expression::make_temporary_reference(s2tmp, loc)); | |
7939 | len = Expression::make_call(lenref, call_args, false, loc); | |
7940 | gogo->lower_expression(function, inserter, &len); | |
7941 | gogo->flatten_expression(function, inserter, &len); | |
7942 | l2tmp = Statement::make_temporary(int_type, len, loc); | |
7943 | inserter->insert(l2tmp); | |
7944 | ||
7945 | // len2 = l2tmp | |
7946 | len2 = Expression::make_temporary_reference(l2tmp, loc); | |
7947 | } | |
7948 | else | |
7949 | { | |
7950 | // We have to ensure that all the arguments are in variables | |
7951 | // now, because otherwise if one of them is an index expression | |
7952 | // into the current slice we could overwrite it before we fetch | |
7953 | // it. | |
7954 | add = new Expression_list(); | |
7955 | Expression_list::const_iterator pa = args->begin(); | |
7956 | for (++pa; pa != args->end(); ++pa) | |
7957 | { | |
7958 | if ((*pa)->is_variable()) | |
7959 | add->push_back(*pa); | |
7960 | else | |
7961 | { | |
7962 | Temporary_statement* tmp = Statement::make_temporary(NULL, *pa, | |
7963 | loc); | |
7964 | inserter->insert(tmp); | |
7965 | add->push_back(Expression::make_temporary_reference(tmp, loc)); | |
7966 | } | |
7967 | } | |
7968 | ||
7969 | // len2 = len(add) | |
7970 | len2 = Expression::make_integer_ul(add->size(), int_type, loc); | |
7971 | } | |
7972 | ||
7973 | // ntmp := l1tmp + len2 | |
7974 | Expression* ref = Expression::make_temporary_reference(l1tmp, loc); | |
7975 | Expression* sum = Expression::make_binary(OPERATOR_PLUS, ref, len2, loc); | |
7976 | gogo->lower_expression(function, inserter, &sum); | |
7977 | gogo->flatten_expression(function, inserter, &sum); | |
7978 | Temporary_statement* ntmp = Statement::make_temporary(int_type, sum, loc); | |
7979 | inserter->insert(ntmp); | |
7980 | ||
7981 | // s1tmp = uint(ntmp) > uint(cap(s1tmp)) ? | |
7982 | // growslice(type, s1tmp, ntmp) : | |
7983 | // s1tmp[:ntmp] | |
7984 | // Using uint here means that if the computation of ntmp overflowed, | |
7985 | // we will call growslice which will panic. | |
7986 | ||
7987 | Expression* left = Expression::make_temporary_reference(ntmp, loc); | |
7988 | left = Expression::make_cast(uint_type, left, loc); | |
7989 | ||
7990 | Named_object* capfn = gogo->lookup_global("cap"); | |
7991 | Expression* capref = Expression::make_func_reference(capfn, NULL, loc); | |
7992 | call_args = new Expression_list(); | |
7993 | call_args->push_back(Expression::make_temporary_reference(s1tmp, loc)); | |
7994 | Expression* right = Expression::make_call(capref, call_args, false, loc); | |
7995 | right = Expression::make_cast(uint_type, right, loc); | |
7996 | ||
7997 | Expression* cond = Expression::make_binary(OPERATOR_GT, left, right, loc); | |
7998 | ||
7999 | Expression* a1 = Expression::make_type_descriptor(element_type, loc); | |
8000 | Expression* a2 = Expression::make_temporary_reference(s1tmp, loc); | |
8001 | Expression* a3 = Expression::make_temporary_reference(ntmp, loc); | |
8002 | Expression* call = Runtime::make_call(Runtime::GROWSLICE, loc, 3, | |
8003 | a1, a2, a3); | |
8004 | call = Expression::make_unsafe_cast(slice_type, call, loc); | |
8005 | ||
8006 | ref = Expression::make_temporary_reference(s1tmp, loc); | |
8007 | Expression* zero = Expression::make_integer_ul(0, int_type, loc); | |
8008 | Expression* ref2 = Expression::make_temporary_reference(ntmp, loc); | |
8009 | // FIXME: Mark this index as not requiring bounds checks. | |
8010 | ref = Expression::make_index(ref, zero, ref2, NULL, loc); | |
8011 | ||
d3c55148 | 8012 | if (assign_lhs == NULL) |
8013 | { | |
8014 | Expression* rhs = Expression::make_conditional(cond, call, ref, loc); | |
8015 | ||
8016 | gogo->lower_expression(function, inserter, &rhs); | |
8017 | gogo->flatten_expression(function, inserter, &rhs); | |
8018 | ||
8019 | ref = Expression::make_temporary_reference(s1tmp, loc); | |
8020 | Statement* assign = Statement::make_assignment(ref, rhs, loc); | |
8021 | inserter->insert(assign); | |
8022 | } | |
8023 | else | |
8024 | { | |
8025 | gogo->lower_expression(function, inserter, &cond); | |
8026 | gogo->flatten_expression(function, inserter, &cond); | |
8027 | gogo->lower_expression(function, inserter, &call); | |
8028 | gogo->flatten_expression(function, inserter, &call); | |
8029 | gogo->lower_expression(function, inserter, &ref); | |
8030 | gogo->flatten_expression(function, inserter, &ref); | |
8031 | ||
8032 | Block* then_block = new Block(enclosing, loc); | |
8033 | Assignment_statement* assign = | |
8034 | Statement::make_assignment(assign_lhs, call, loc); | |
8035 | then_block->add_statement(assign); | |
321e5ad2 | 8036 | |
d3c55148 | 8037 | Block* else_block = new Block(enclosing, loc); |
8038 | assign = Statement::make_assignment(assign_lhs->copy(), ref, loc); | |
8039 | // This assignment will not change the pointer value, so it does | |
8040 | // not need a write barrier. | |
8041 | assign->set_omit_write_barrier(); | |
8042 | else_block->add_statement(assign); | |
321e5ad2 | 8043 | |
d3c55148 | 8044 | Statement* s = Statement::make_if_statement(cond, then_block, |
8045 | else_block, loc); | |
8046 | inserter->insert(s); | |
8047 | ||
8048 | ref = Expression::make_temporary_reference(s1tmp, loc); | |
8049 | assign = Statement::make_assignment(ref, assign_lhs->copy(), loc); | |
8050 | inserter->insert(assign); | |
8051 | } | |
321e5ad2 | 8052 | |
8053 | if (this->is_varargs()) | |
8054 | { | |
8055 | // copy(s1tmp[l1tmp:], s2tmp) | |
8056 | a1 = Expression::make_temporary_reference(s1tmp, loc); | |
8057 | ref = Expression::make_temporary_reference(l1tmp, loc); | |
8058 | Expression* nil = Expression::make_nil(loc); | |
8059 | // FIXME: Mark this index as not requiring bounds checks. | |
8060 | a1 = Expression::make_index(a1, ref, nil, NULL, loc); | |
8061 | ||
8062 | a2 = Expression::make_temporary_reference(s2tmp, loc); | |
8063 | ||
8064 | Named_object* copyfn = gogo->lookup_global("copy"); | |
8065 | Expression* copyref = Expression::make_func_reference(copyfn, NULL, loc); | |
8066 | call_args = new Expression_list(); | |
8067 | call_args->push_back(a1); | |
8068 | call_args->push_back(a2); | |
8069 | call = Expression::make_call(copyref, call_args, false, loc); | |
8070 | gogo->lower_expression(function, inserter, &call); | |
8071 | gogo->flatten_expression(function, inserter, &call); | |
8072 | inserter->insert(Statement::make_statement(call, false)); | |
8073 | } | |
8074 | else | |
8075 | { | |
8076 | // For each argument: | |
8077 | // s1tmp[l1tmp+i] = a | |
8078 | unsigned long i = 0; | |
8079 | for (Expression_list::const_iterator pa = add->begin(); | |
8080 | pa != add->end(); | |
8081 | ++pa, ++i) | |
8082 | { | |
8083 | ref = Expression::make_temporary_reference(s1tmp, loc); | |
8084 | ref2 = Expression::make_temporary_reference(l1tmp, loc); | |
8085 | Expression* off = Expression::make_integer_ul(i, int_type, loc); | |
8086 | ref2 = Expression::make_binary(OPERATOR_PLUS, ref2, off, loc); | |
8087 | // FIXME: Mark this index as not requiring bounds checks. | |
d3c55148 | 8088 | Expression* lhs = Expression::make_index(ref, ref2, NULL, NULL, |
8089 | loc); | |
321e5ad2 | 8090 | gogo->lower_expression(function, inserter, &lhs); |
8091 | gogo->flatten_expression(function, inserter, &lhs); | |
03118c21 | 8092 | // The flatten pass runs after the write barrier pass, so we |
8093 | // need to insert a write barrier here if necessary. | |
d3c55148 | 8094 | // However, if ASSIGN_LHS is not NULL, we have been called |
8095 | // directly before the write barrier pass. | |
8096 | Statement* assign; | |
8097 | if (assign_lhs != NULL | |
8098 | || !gogo->assign_needs_write_barrier(lhs)) | |
03118c21 | 8099 | assign = Statement::make_assignment(lhs, *pa, loc); |
8100 | else | |
8101 | { | |
8102 | Function* f = function == NULL ? NULL : function->func_value(); | |
8103 | assign = gogo->assign_with_write_barrier(f, NULL, inserter, | |
8104 | lhs, *pa, loc); | |
8105 | } | |
321e5ad2 | 8106 | inserter->insert(assign); |
8107 | } | |
8108 | } | |
8109 | ||
d3c55148 | 8110 | if (assign_lhs != NULL) |
8111 | return NULL; | |
8112 | ||
321e5ad2 | 8113 | return Expression::make_temporary_reference(s1tmp, loc); |
8114 | } | |
8115 | ||
a9182619 | 8116 | // Return whether an expression has an integer value. Report an error |
8117 | // if not. This is used when handling calls to the predeclared make | |
ccea2b36 | 8118 | // function. Set *SMALL if the value is known to fit in type "int". |
a9182619 | 8119 | |
8120 | bool | |
ccea2b36 | 8121 | Builtin_call_expression::check_int_value(Expression* e, bool is_length, |
8122 | bool *small) | |
a9182619 | 8123 | { |
ccea2b36 | 8124 | *small = false; |
8125 | ||
0c77715b | 8126 | Numeric_constant nc; |
1ad00fd4 | 8127 | if (e->numeric_constant_value(&nc)) |
a9182619 | 8128 | { |
1ad00fd4 | 8129 | unsigned long v; |
8130 | switch (nc.to_unsigned_long(&v)) | |
8131 | { | |
8132 | case Numeric_constant::NC_UL_VALID: | |
1b10c5e7 | 8133 | break; |
1ad00fd4 | 8134 | case Numeric_constant::NC_UL_NOTINT: |
631d5788 | 8135 | go_error_at(e->location(), "non-integer %s argument to make", |
8136 | is_length ? "len" : "cap"); | |
1ad00fd4 | 8137 | return false; |
8138 | case Numeric_constant::NC_UL_NEGATIVE: | |
631d5788 | 8139 | go_error_at(e->location(), "negative %s argument to make", |
8140 | is_length ? "len" : "cap"); | |
1ad00fd4 | 8141 | return false; |
8142 | case Numeric_constant::NC_UL_BIG: | |
8143 | // We don't want to give a compile-time error for a 64-bit | |
8144 | // value on a 32-bit target. | |
1b10c5e7 | 8145 | break; |
1ad00fd4 | 8146 | } |
1b10c5e7 | 8147 | |
8148 | mpz_t val; | |
8149 | if (!nc.to_int(&val)) | |
8150 | go_unreachable(); | |
8151 | int bits = mpz_sizeinbase(val, 2); | |
8152 | mpz_clear(val); | |
8153 | Type* int_type = Type::lookup_integer_type("int"); | |
8154 | if (bits >= int_type->integer_type()->bits()) | |
8155 | { | |
631d5788 | 8156 | go_error_at(e->location(), "%s argument too large for make", |
8157 | is_length ? "len" : "cap"); | |
1b10c5e7 | 8158 | return false; |
8159 | } | |
8160 | ||
ccea2b36 | 8161 | *small = true; |
1b10c5e7 | 8162 | return true; |
a9182619 | 8163 | } |
8164 | ||
1ad00fd4 | 8165 | if (e->type()->integer_type() != NULL) |
ccea2b36 | 8166 | { |
8167 | int ebits = e->type()->integer_type()->bits(); | |
8168 | int intbits = Type::lookup_integer_type("int")->integer_type()->bits(); | |
8169 | ||
8170 | // We can treat ebits == intbits as small even for an unsigned | |
8171 | // integer type, because we will convert the value to int and | |
8172 | // then reject it in the runtime if it is negative. | |
8173 | *small = ebits <= intbits; | |
8174 | ||
8175 | return true; | |
8176 | } | |
1ad00fd4 | 8177 | |
631d5788 | 8178 | go_error_at(e->location(), "non-integer %s argument to make", |
8179 | is_length ? "len" : "cap"); | |
a9182619 | 8180 | return false; |
8181 | } | |
8182 | ||
e440a328 | 8183 | // Return the type of the real or imag functions, given the type of |
fcbea5e4 | 8184 | // the argument. We need to map complex64 to float32 and complex128 |
8185 | // to float64, so it has to be done by name. This returns NULL if it | |
8186 | // can't figure out the type. | |
e440a328 | 8187 | |
8188 | Type* | |
8189 | Builtin_call_expression::real_imag_type(Type* arg_type) | |
8190 | { | |
8191 | if (arg_type == NULL || arg_type->is_abstract()) | |
8192 | return NULL; | |
8193 | Named_type* nt = arg_type->named_type(); | |
8194 | if (nt == NULL) | |
8195 | return NULL; | |
8196 | while (nt->real_type()->named_type() != NULL) | |
8197 | nt = nt->real_type()->named_type(); | |
48080209 | 8198 | if (nt->name() == "complex64") |
e440a328 | 8199 | return Type::lookup_float_type("float32"); |
8200 | else if (nt->name() == "complex128") | |
8201 | return Type::lookup_float_type("float64"); | |
8202 | else | |
8203 | return NULL; | |
8204 | } | |
8205 | ||
48080209 | 8206 | // Return the type of the complex function, given the type of one of the |
e440a328 | 8207 | // argments. Like real_imag_type, we have to map by name. |
8208 | ||
8209 | Type* | |
48080209 | 8210 | Builtin_call_expression::complex_type(Type* arg_type) |
e440a328 | 8211 | { |
8212 | if (arg_type == NULL || arg_type->is_abstract()) | |
8213 | return NULL; | |
8214 | Named_type* nt = arg_type->named_type(); | |
8215 | if (nt == NULL) | |
8216 | return NULL; | |
8217 | while (nt->real_type()->named_type() != NULL) | |
8218 | nt = nt->real_type()->named_type(); | |
48080209 | 8219 | if (nt->name() == "float32") |
e440a328 | 8220 | return Type::lookup_complex_type("complex64"); |
8221 | else if (nt->name() == "float64") | |
8222 | return Type::lookup_complex_type("complex128"); | |
8223 | else | |
8224 | return NULL; | |
8225 | } | |
8226 | ||
8227 | // Return a single argument, or NULL if there isn't one. | |
8228 | ||
8229 | Expression* | |
8230 | Builtin_call_expression::one_arg() const | |
8231 | { | |
8232 | const Expression_list* args = this->args(); | |
aa615cb3 | 8233 | if (args == NULL || args->size() != 1) |
e440a328 | 8234 | return NULL; |
8235 | return args->front(); | |
8236 | } | |
8237 | ||
83921647 | 8238 | // A traversal class which looks for a call or receive expression. |
8239 | ||
8240 | class Find_call_expression : public Traverse | |
8241 | { | |
8242 | public: | |
8243 | Find_call_expression() | |
8244 | : Traverse(traverse_expressions), | |
8245 | found_(false) | |
8246 | { } | |
8247 | ||
8248 | int | |
8249 | expression(Expression**); | |
8250 | ||
8251 | bool | |
8252 | found() | |
8253 | { return this->found_; } | |
8254 | ||
8255 | private: | |
8256 | bool found_; | |
8257 | }; | |
8258 | ||
8259 | int | |
8260 | Find_call_expression::expression(Expression** pexpr) | |
8261 | { | |
4714afb2 | 8262 | Expression* expr = *pexpr; |
8263 | if (!expr->is_constant() | |
8264 | && (expr->call_expression() != NULL | |
8265 | || expr->receive_expression() != NULL)) | |
83921647 | 8266 | { |
8267 | this->found_ = true; | |
8268 | return TRAVERSE_EXIT; | |
8269 | } | |
8270 | return TRAVERSE_CONTINUE; | |
8271 | } | |
8272 | ||
4714afb2 | 8273 | // Return whether calling len or cap on EXPR, of array type, is a |
8274 | // constant. The language spec says "the expressions len(s) and | |
8275 | // cap(s) are constants if the type of s is an array or pointer to an | |
8276 | // array and the expression s does not contain channel receives or | |
8277 | // (non-constant) function calls." | |
8278 | ||
8279 | bool | |
8280 | Builtin_call_expression::array_len_is_constant(Expression* expr) | |
8281 | { | |
8282 | go_assert(expr->type()->deref()->array_type() != NULL | |
8283 | && !expr->type()->deref()->is_slice_type()); | |
8284 | if (expr->is_constant()) | |
8285 | return true; | |
8286 | Find_call_expression find_call; | |
8287 | Expression::traverse(&expr, &find_call); | |
8288 | return !find_call.found(); | |
8289 | } | |
8290 | ||
83921647 | 8291 | // Return whether this is constant: len of a string constant, or len |
8292 | // or cap of an array, or unsafe.Sizeof, unsafe.Offsetof, | |
8293 | // unsafe.Alignof. | |
e440a328 | 8294 | |
8295 | bool | |
8296 | Builtin_call_expression::do_is_constant() const | |
8297 | { | |
12e69faa | 8298 | if (this->is_error_expression()) |
8299 | return true; | |
e440a328 | 8300 | switch (this->code_) |
8301 | { | |
8302 | case BUILTIN_LEN: | |
8303 | case BUILTIN_CAP: | |
8304 | { | |
0f914071 | 8305 | if (this->seen_) |
8306 | return false; | |
8307 | ||
e440a328 | 8308 | Expression* arg = this->one_arg(); |
8309 | if (arg == NULL) | |
8310 | return false; | |
8311 | Type* arg_type = arg->type(); | |
8312 | ||
8313 | if (arg_type->points_to() != NULL | |
8314 | && arg_type->points_to()->array_type() != NULL | |
411eb89e | 8315 | && !arg_type->points_to()->is_slice_type()) |
e440a328 | 8316 | arg_type = arg_type->points_to(); |
8317 | ||
8318 | if (arg_type->array_type() != NULL | |
54934d77 | 8319 | && arg_type->array_type()->length() != NULL) |
8320 | { | |
8321 | this->seen_ = true; | |
8322 | bool ret = Builtin_call_expression::array_len_is_constant(arg); | |
8323 | this->seen_ = false; | |
8324 | return ret; | |
8325 | } | |
e440a328 | 8326 | |
8327 | if (this->code_ == BUILTIN_LEN && arg_type->is_string_type()) | |
0f914071 | 8328 | { |
8329 | this->seen_ = true; | |
8330 | bool ret = arg->is_constant(); | |
8331 | this->seen_ = false; | |
8332 | return ret; | |
8333 | } | |
e440a328 | 8334 | } |
8335 | break; | |
8336 | ||
8337 | case BUILTIN_SIZEOF: | |
8338 | case BUILTIN_ALIGNOF: | |
8339 | return this->one_arg() != NULL; | |
8340 | ||
8341 | case BUILTIN_OFFSETOF: | |
8342 | { | |
8343 | Expression* arg = this->one_arg(); | |
8344 | if (arg == NULL) | |
8345 | return false; | |
8346 | return arg->field_reference_expression() != NULL; | |
8347 | } | |
8348 | ||
48080209 | 8349 | case BUILTIN_COMPLEX: |
e440a328 | 8350 | { |
8351 | const Expression_list* args = this->args(); | |
8352 | if (args != NULL && args->size() == 2) | |
8353 | return args->front()->is_constant() && args->back()->is_constant(); | |
8354 | } | |
8355 | break; | |
8356 | ||
8357 | case BUILTIN_REAL: | |
8358 | case BUILTIN_IMAG: | |
8359 | { | |
8360 | Expression* arg = this->one_arg(); | |
8361 | return arg != NULL && arg->is_constant(); | |
8362 | } | |
8363 | ||
8364 | default: | |
8365 | break; | |
8366 | } | |
8367 | ||
8368 | return false; | |
8369 | } | |
8370 | ||
0c77715b | 8371 | // Return a numeric constant if possible. |
e440a328 | 8372 | |
8373 | bool | |
0c77715b | 8374 | Builtin_call_expression::do_numeric_constant_value(Numeric_constant* nc) const |
e440a328 | 8375 | { |
8376 | if (this->code_ == BUILTIN_LEN | |
8377 | || this->code_ == BUILTIN_CAP) | |
8378 | { | |
8379 | Expression* arg = this->one_arg(); | |
8380 | if (arg == NULL) | |
8381 | return false; | |
8382 | Type* arg_type = arg->type(); | |
8383 | ||
8384 | if (this->code_ == BUILTIN_LEN && arg_type->is_string_type()) | |
8385 | { | |
8386 | std::string sval; | |
8387 | if (arg->string_constant_value(&sval)) | |
8388 | { | |
0c77715b | 8389 | nc->set_unsigned_long(Type::lookup_integer_type("int"), |
8390 | sval.length()); | |
e440a328 | 8391 | return true; |
8392 | } | |
8393 | } | |
8394 | ||
8395 | if (arg_type->points_to() != NULL | |
8396 | && arg_type->points_to()->array_type() != NULL | |
411eb89e | 8397 | && !arg_type->points_to()->is_slice_type()) |
e440a328 | 8398 | arg_type = arg_type->points_to(); |
8399 | ||
8400 | if (arg_type->array_type() != NULL | |
8401 | && arg_type->array_type()->length() != NULL) | |
8402 | { | |
0f914071 | 8403 | if (this->seen_) |
8404 | return false; | |
e440a328 | 8405 | Expression* e = arg_type->array_type()->length(); |
0f914071 | 8406 | this->seen_ = true; |
0c77715b | 8407 | bool r = e->numeric_constant_value(nc); |
0f914071 | 8408 | this->seen_ = false; |
8409 | if (r) | |
e440a328 | 8410 | { |
0c77715b | 8411 | if (!nc->set_type(Type::lookup_integer_type("int"), false, |
8412 | this->location())) | |
8413 | r = false; | |
e440a328 | 8414 | } |
0c77715b | 8415 | return r; |
e440a328 | 8416 | } |
8417 | } | |
8418 | else if (this->code_ == BUILTIN_SIZEOF | |
8419 | || this->code_ == BUILTIN_ALIGNOF) | |
8420 | { | |
8421 | Expression* arg = this->one_arg(); | |
8422 | if (arg == NULL) | |
8423 | return false; | |
8424 | Type* arg_type = arg->type(); | |
5c13bd80 | 8425 | if (arg_type->is_error()) |
e440a328 | 8426 | return false; |
8427 | if (arg_type->is_abstract()) | |
7200ac0e | 8428 | arg_type = arg_type->make_non_abstract_type(); |
2c809f8f | 8429 | if (this->seen_) |
8430 | return false; | |
927a01eb | 8431 | |
3f378015 | 8432 | int64_t ret; |
e440a328 | 8433 | if (this->code_ == BUILTIN_SIZEOF) |
8434 | { | |
2c809f8f | 8435 | this->seen_ = true; |
8436 | bool ok = arg_type->backend_type_size(this->gogo_, &ret); | |
8437 | this->seen_ = false; | |
8438 | if (!ok) | |
e440a328 | 8439 | return false; |
8440 | } | |
8441 | else if (this->code_ == BUILTIN_ALIGNOF) | |
8442 | { | |
2c809f8f | 8443 | bool ok; |
8444 | this->seen_ = true; | |
637bd3af | 8445 | if (arg->field_reference_expression() == NULL) |
2c809f8f | 8446 | ok = arg_type->backend_type_align(this->gogo_, &ret); |
637bd3af | 8447 | else |
e440a328 | 8448 | { |
8449 | // Calling unsafe.Alignof(s.f) returns the alignment of | |
8450 | // the type of f when it is used as a field in a struct. | |
2c809f8f | 8451 | ok = arg_type->backend_type_field_align(this->gogo_, &ret); |
e440a328 | 8452 | } |
2c809f8f | 8453 | this->seen_ = false; |
8454 | if (!ok) | |
8455 | return false; | |
e440a328 | 8456 | } |
8457 | else | |
c3e6f413 | 8458 | go_unreachable(); |
927a01eb | 8459 | |
3f378015 | 8460 | mpz_t zval; |
8461 | set_mpz_from_int64(&zval, ret); | |
8462 | nc->set_int(Type::lookup_integer_type("uintptr"), zval); | |
8463 | mpz_clear(zval); | |
e440a328 | 8464 | return true; |
8465 | } | |
8466 | else if (this->code_ == BUILTIN_OFFSETOF) | |
8467 | { | |
8468 | Expression* arg = this->one_arg(); | |
8469 | if (arg == NULL) | |
8470 | return false; | |
8471 | Field_reference_expression* farg = arg->field_reference_expression(); | |
8472 | if (farg == NULL) | |
8473 | return false; | |
2c809f8f | 8474 | if (this->seen_) |
8475 | return false; | |
8476 | ||
3f378015 | 8477 | int64_t total_offset = 0; |
9a4bd570 | 8478 | while (true) |
8479 | { | |
8480 | Expression* struct_expr = farg->expr(); | |
8481 | Type* st = struct_expr->type(); | |
8482 | if (st->struct_type() == NULL) | |
8483 | return false; | |
8484 | if (st->named_type() != NULL) | |
8485 | st->named_type()->convert(this->gogo_); | |
fbabafbd | 8486 | if (st->is_error_type()) |
8487 | { | |
8488 | go_assert(saw_errors()); | |
8489 | return false; | |
8490 | } | |
3f378015 | 8491 | int64_t offset; |
2c809f8f | 8492 | this->seen_ = true; |
8493 | bool ok = st->struct_type()->backend_field_offset(this->gogo_, | |
8494 | farg->field_index(), | |
8495 | &offset); | |
8496 | this->seen_ = false; | |
8497 | if (!ok) | |
8498 | return false; | |
9a4bd570 | 8499 | total_offset += offset; |
8500 | if (farg->implicit() && struct_expr->field_reference_expression() != NULL) | |
8501 | { | |
8502 | // Go up until we reach the original base. | |
8503 | farg = struct_expr->field_reference_expression(); | |
8504 | continue; | |
8505 | } | |
8506 | break; | |
8507 | } | |
3f378015 | 8508 | mpz_t zval; |
8509 | set_mpz_from_int64(&zval, total_offset); | |
8510 | nc->set_int(Type::lookup_integer_type("uintptr"), zval); | |
8511 | mpz_clear(zval); | |
e440a328 | 8512 | return true; |
8513 | } | |
0c77715b | 8514 | else if (this->code_ == BUILTIN_REAL || this->code_ == BUILTIN_IMAG) |
e440a328 | 8515 | { |
8516 | Expression* arg = this->one_arg(); | |
8517 | if (arg == NULL) | |
8518 | return false; | |
8519 | ||
0c77715b | 8520 | Numeric_constant argnc; |
8521 | if (!arg->numeric_constant_value(&argnc)) | |
8522 | return false; | |
8523 | ||
fcbea5e4 | 8524 | mpc_t val; |
8525 | if (!argnc.to_complex(&val)) | |
0c77715b | 8526 | return false; |
e440a328 | 8527 | |
0c77715b | 8528 | Type* type = Builtin_call_expression::real_imag_type(argnc.type()); |
8529 | if (this->code_ == BUILTIN_REAL) | |
fcbea5e4 | 8530 | nc->set_float(type, mpc_realref(val)); |
0c77715b | 8531 | else |
fcbea5e4 | 8532 | nc->set_float(type, mpc_imagref(val)); |
8533 | mpc_clear(val); | |
0c77715b | 8534 | return true; |
e440a328 | 8535 | } |
0c77715b | 8536 | else if (this->code_ == BUILTIN_COMPLEX) |
e440a328 | 8537 | { |
8538 | const Expression_list* args = this->args(); | |
8539 | if (args == NULL || args->size() != 2) | |
8540 | return false; | |
8541 | ||
0c77715b | 8542 | Numeric_constant rnc; |
8543 | if (!args->front()->numeric_constant_value(&rnc)) | |
8544 | return false; | |
8545 | Numeric_constant inc; | |
8546 | if (!args->back()->numeric_constant_value(&inc)) | |
8547 | return false; | |
8548 | ||
8549 | if (rnc.type() != NULL | |
8550 | && !rnc.type()->is_abstract() | |
8551 | && inc.type() != NULL | |
8552 | && !inc.type()->is_abstract() | |
3a522dcc | 8553 | && !Type::are_identical(rnc.type(), inc.type(), |
8554 | Type::COMPARE_ERRORS | Type::COMPARE_TAGS, | |
8555 | NULL)) | |
0c77715b | 8556 | return false; |
8557 | ||
e440a328 | 8558 | mpfr_t r; |
0c77715b | 8559 | if (!rnc.to_float(&r)) |
8560 | return false; | |
8561 | mpfr_t i; | |
8562 | if (!inc.to_float(&i)) | |
e440a328 | 8563 | { |
8564 | mpfr_clear(r); | |
8565 | return false; | |
8566 | } | |
8567 | ||
0c77715b | 8568 | Type* arg_type = rnc.type(); |
8569 | if (arg_type == NULL || arg_type->is_abstract()) | |
8570 | arg_type = inc.type(); | |
e440a328 | 8571 | |
fcbea5e4 | 8572 | mpc_t val; |
8573 | mpc_init2(val, mpc_precision); | |
8574 | mpc_set_fr_fr(val, r, i, MPC_RNDNN); | |
e440a328 | 8575 | mpfr_clear(r); |
8576 | mpfr_clear(i); | |
8577 | ||
fcbea5e4 | 8578 | Type* type = Builtin_call_expression::complex_type(arg_type); |
8579 | nc->set_complex(type, val); | |
8580 | ||
8581 | mpc_clear(val); | |
8582 | ||
0c77715b | 8583 | return true; |
e440a328 | 8584 | } |
8585 | ||
8586 | return false; | |
8587 | } | |
8588 | ||
a7549a6a | 8589 | // Give an error if we are discarding the value of an expression which |
8590 | // should not normally be discarded. We don't give an error for | |
8591 | // discarding the value of an ordinary function call, but we do for | |
8592 | // builtin functions, purely for consistency with the gc compiler. | |
8593 | ||
4f2138d7 | 8594 | bool |
a7549a6a | 8595 | Builtin_call_expression::do_discarding_value() |
8596 | { | |
8597 | switch (this->code_) | |
8598 | { | |
8599 | case BUILTIN_INVALID: | |
8600 | default: | |
8601 | go_unreachable(); | |
8602 | ||
8603 | case BUILTIN_APPEND: | |
8604 | case BUILTIN_CAP: | |
8605 | case BUILTIN_COMPLEX: | |
8606 | case BUILTIN_IMAG: | |
8607 | case BUILTIN_LEN: | |
8608 | case BUILTIN_MAKE: | |
8609 | case BUILTIN_NEW: | |
8610 | case BUILTIN_REAL: | |
8611 | case BUILTIN_ALIGNOF: | |
8612 | case BUILTIN_OFFSETOF: | |
8613 | case BUILTIN_SIZEOF: | |
8614 | this->unused_value_error(); | |
4f2138d7 | 8615 | return false; |
a7549a6a | 8616 | |
8617 | case BUILTIN_CLOSE: | |
8618 | case BUILTIN_COPY: | |
1cce762f | 8619 | case BUILTIN_DELETE: |
a7549a6a | 8620 | case BUILTIN_PANIC: |
8621 | case BUILTIN_PRINT: | |
8622 | case BUILTIN_PRINTLN: | |
8623 | case BUILTIN_RECOVER: | |
4f2138d7 | 8624 | return true; |
a7549a6a | 8625 | } |
8626 | } | |
8627 | ||
e440a328 | 8628 | // Return the type. |
8629 | ||
8630 | Type* | |
8631 | Builtin_call_expression::do_type() | |
8632 | { | |
79651b1f | 8633 | if (this->is_error_expression()) |
8634 | return Type::make_error_type(); | |
e440a328 | 8635 | switch (this->code_) |
8636 | { | |
8637 | case BUILTIN_INVALID: | |
8638 | default: | |
79651b1f | 8639 | return Type::make_error_type(); |
e440a328 | 8640 | |
8641 | case BUILTIN_NEW: | |
e440a328 | 8642 | { |
8643 | const Expression_list* args = this->args(); | |
8644 | if (args == NULL || args->empty()) | |
8645 | return Type::make_error_type(); | |
8646 | return Type::make_pointer_type(args->front()->type()); | |
8647 | } | |
8648 | ||
a065edc5 | 8649 | case BUILTIN_MAKE: |
8650 | { | |
8651 | const Expression_list* args = this->args(); | |
8652 | if (args == NULL || args->empty()) | |
8653 | return Type::make_error_type(); | |
8654 | return args->front()->type(); | |
8655 | } | |
8656 | ||
e440a328 | 8657 | case BUILTIN_CAP: |
8658 | case BUILTIN_COPY: | |
8659 | case BUILTIN_LEN: | |
7ba86326 | 8660 | return Type::lookup_integer_type("int"); |
8661 | ||
e440a328 | 8662 | case BUILTIN_ALIGNOF: |
8663 | case BUILTIN_OFFSETOF: | |
8664 | case BUILTIN_SIZEOF: | |
7ba86326 | 8665 | return Type::lookup_integer_type("uintptr"); |
e440a328 | 8666 | |
8667 | case BUILTIN_CLOSE: | |
1cce762f | 8668 | case BUILTIN_DELETE: |
e440a328 | 8669 | case BUILTIN_PANIC: |
8670 | case BUILTIN_PRINT: | |
8671 | case BUILTIN_PRINTLN: | |
8672 | return Type::make_void_type(); | |
8673 | ||
e440a328 | 8674 | case BUILTIN_RECOVER: |
823c7e3d | 8675 | return Type::make_empty_interface_type(Linemap::predeclared_location()); |
e440a328 | 8676 | |
8677 | case BUILTIN_APPEND: | |
8678 | { | |
8679 | const Expression_list* args = this->args(); | |
8680 | if (args == NULL || args->empty()) | |
8681 | return Type::make_error_type(); | |
3ff4863b | 8682 | Type *ret = args->front()->type(); |
8683 | if (!ret->is_slice_type()) | |
8684 | return Type::make_error_type(); | |
8685 | return ret; | |
e440a328 | 8686 | } |
8687 | ||
8688 | case BUILTIN_REAL: | |
8689 | case BUILTIN_IMAG: | |
8690 | { | |
8691 | Expression* arg = this->one_arg(); | |
8692 | if (arg == NULL) | |
8693 | return Type::make_error_type(); | |
8694 | Type* t = arg->type(); | |
8695 | if (t->is_abstract()) | |
8696 | t = t->make_non_abstract_type(); | |
8697 | t = Builtin_call_expression::real_imag_type(t); | |
8698 | if (t == NULL) | |
8699 | t = Type::make_error_type(); | |
8700 | return t; | |
8701 | } | |
8702 | ||
48080209 | 8703 | case BUILTIN_COMPLEX: |
e440a328 | 8704 | { |
8705 | const Expression_list* args = this->args(); | |
8706 | if (args == NULL || args->size() != 2) | |
8707 | return Type::make_error_type(); | |
8708 | Type* t = args->front()->type(); | |
8709 | if (t->is_abstract()) | |
8710 | { | |
8711 | t = args->back()->type(); | |
8712 | if (t->is_abstract()) | |
8713 | t = t->make_non_abstract_type(); | |
8714 | } | |
48080209 | 8715 | t = Builtin_call_expression::complex_type(t); |
e440a328 | 8716 | if (t == NULL) |
8717 | t = Type::make_error_type(); | |
8718 | return t; | |
8719 | } | |
8720 | } | |
8721 | } | |
8722 | ||
8723 | // Determine the type. | |
8724 | ||
8725 | void | |
8726 | Builtin_call_expression::do_determine_type(const Type_context* context) | |
8727 | { | |
fb94b0ca | 8728 | if (!this->determining_types()) |
8729 | return; | |
8730 | ||
e440a328 | 8731 | this->fn()->determine_type_no_context(); |
8732 | ||
8733 | const Expression_list* args = this->args(); | |
8734 | ||
8735 | bool is_print; | |
8736 | Type* arg_type = NULL; | |
321e5ad2 | 8737 | Type* trailing_arg_types = NULL; |
e440a328 | 8738 | switch (this->code_) |
8739 | { | |
8740 | case BUILTIN_PRINT: | |
8741 | case BUILTIN_PRINTLN: | |
8742 | // Do not force a large integer constant to "int". | |
8743 | is_print = true; | |
8744 | break; | |
8745 | ||
8746 | case BUILTIN_REAL: | |
8747 | case BUILTIN_IMAG: | |
48080209 | 8748 | arg_type = Builtin_call_expression::complex_type(context->type); |
f6bc81e6 | 8749 | if (arg_type == NULL) |
8750 | arg_type = Type::lookup_complex_type("complex128"); | |
e440a328 | 8751 | is_print = false; |
8752 | break; | |
8753 | ||
48080209 | 8754 | case BUILTIN_COMPLEX: |
e440a328 | 8755 | { |
48080209 | 8756 | // For the complex function the type of one operand can |
e440a328 | 8757 | // determine the type of the other, as in a binary expression. |
8758 | arg_type = Builtin_call_expression::real_imag_type(context->type); | |
f6bc81e6 | 8759 | if (arg_type == NULL) |
8760 | arg_type = Type::lookup_float_type("float64"); | |
e440a328 | 8761 | if (args != NULL && args->size() == 2) |
8762 | { | |
8763 | Type* t1 = args->front()->type(); | |
c849bb59 | 8764 | Type* t2 = args->back()->type(); |
e440a328 | 8765 | if (!t1->is_abstract()) |
8766 | arg_type = t1; | |
8767 | else if (!t2->is_abstract()) | |
8768 | arg_type = t2; | |
8769 | } | |
8770 | is_print = false; | |
8771 | } | |
8772 | break; | |
8773 | ||
321e5ad2 | 8774 | case BUILTIN_APPEND: |
8775 | if (!this->is_varargs() | |
8776 | && args != NULL | |
8777 | && !args->empty() | |
8778 | && args->front()->type()->is_slice_type()) | |
8779 | trailing_arg_types = | |
8780 | args->front()->type()->array_type()->element_type(); | |
8781 | is_print = false; | |
8782 | break; | |
8783 | ||
e440a328 | 8784 | default: |
8785 | is_print = false; | |
8786 | break; | |
8787 | } | |
8788 | ||
8789 | if (args != NULL) | |
8790 | { | |
8791 | for (Expression_list::const_iterator pa = args->begin(); | |
8792 | pa != args->end(); | |
8793 | ++pa) | |
8794 | { | |
8795 | Type_context subcontext; | |
8796 | subcontext.type = arg_type; | |
8797 | ||
8798 | if (is_print) | |
8799 | { | |
8800 | // We want to print large constants, we so can't just | |
8801 | // use the appropriate nonabstract type. Use uint64 for | |
8802 | // an integer if we know it is nonnegative, otherwise | |
8803 | // use int64 for a integer, otherwise use float64 for a | |
8804 | // float or complex128 for a complex. | |
8805 | Type* want_type = NULL; | |
8806 | Type* atype = (*pa)->type(); | |
8807 | if (atype->is_abstract()) | |
8808 | { | |
8809 | if (atype->integer_type() != NULL) | |
8810 | { | |
0c77715b | 8811 | Numeric_constant nc; |
8812 | if (this->numeric_constant_value(&nc)) | |
8813 | { | |
8814 | mpz_t val; | |
8815 | if (nc.to_int(&val)) | |
8816 | { | |
8817 | if (mpz_sgn(val) >= 0) | |
8818 | want_type = Type::lookup_integer_type("uint64"); | |
8819 | mpz_clear(val); | |
8820 | } | |
8821 | } | |
8822 | if (want_type == NULL) | |
e440a328 | 8823 | want_type = Type::lookup_integer_type("int64"); |
e440a328 | 8824 | } |
8825 | else if (atype->float_type() != NULL) | |
8826 | want_type = Type::lookup_float_type("float64"); | |
8827 | else if (atype->complex_type() != NULL) | |
8828 | want_type = Type::lookup_complex_type("complex128"); | |
8829 | else if (atype->is_abstract_string_type()) | |
8830 | want_type = Type::lookup_string_type(); | |
8831 | else if (atype->is_abstract_boolean_type()) | |
8832 | want_type = Type::lookup_bool_type(); | |
8833 | else | |
c3e6f413 | 8834 | go_unreachable(); |
e440a328 | 8835 | subcontext.type = want_type; |
8836 | } | |
8837 | } | |
8838 | ||
8839 | (*pa)->determine_type(&subcontext); | |
321e5ad2 | 8840 | |
8841 | if (trailing_arg_types != NULL) | |
8842 | { | |
8843 | arg_type = trailing_arg_types; | |
8844 | trailing_arg_types = NULL; | |
8845 | } | |
e440a328 | 8846 | } |
8847 | } | |
8848 | } | |
8849 | ||
8850 | // If there is exactly one argument, return true. Otherwise give an | |
8851 | // error message and return false. | |
8852 | ||
8853 | bool | |
8854 | Builtin_call_expression::check_one_arg() | |
8855 | { | |
8856 | const Expression_list* args = this->args(); | |
8857 | if (args == NULL || args->size() < 1) | |
8858 | { | |
8859 | this->report_error(_("not enough arguments")); | |
8860 | return false; | |
8861 | } | |
8862 | else if (args->size() > 1) | |
8863 | { | |
8864 | this->report_error(_("too many arguments")); | |
8865 | return false; | |
8866 | } | |
8867 | if (args->front()->is_error_expression() | |
5c13bd80 | 8868 | || args->front()->type()->is_error()) |
e440a328 | 8869 | { |
8870 | this->set_is_error(); | |
8871 | return false; | |
8872 | } | |
8873 | return true; | |
8874 | } | |
8875 | ||
8876 | // Check argument types for a builtin function. | |
8877 | ||
8878 | void | |
8879 | Builtin_call_expression::do_check_types(Gogo*) | |
8880 | { | |
375646ea | 8881 | if (this->is_error_expression()) |
8882 | return; | |
e440a328 | 8883 | switch (this->code_) |
8884 | { | |
8885 | case BUILTIN_INVALID: | |
8886 | case BUILTIN_NEW: | |
8887 | case BUILTIN_MAKE: | |
cd238b8d | 8888 | case BUILTIN_DELETE: |
e440a328 | 8889 | return; |
8890 | ||
8891 | case BUILTIN_LEN: | |
8892 | case BUILTIN_CAP: | |
8893 | { | |
8894 | // The single argument may be either a string or an array or a | |
8895 | // map or a channel, or a pointer to a closed array. | |
8896 | if (this->check_one_arg()) | |
8897 | { | |
8898 | Type* arg_type = this->one_arg()->type(); | |
8899 | if (arg_type->points_to() != NULL | |
8900 | && arg_type->points_to()->array_type() != NULL | |
411eb89e | 8901 | && !arg_type->points_to()->is_slice_type()) |
e440a328 | 8902 | arg_type = arg_type->points_to(); |
8903 | if (this->code_ == BUILTIN_CAP) | |
8904 | { | |
5c13bd80 | 8905 | if (!arg_type->is_error() |
e440a328 | 8906 | && arg_type->array_type() == NULL |
8907 | && arg_type->channel_type() == NULL) | |
8908 | this->report_error(_("argument must be array or slice " | |
8909 | "or channel")); | |
8910 | } | |
8911 | else | |
8912 | { | |
5c13bd80 | 8913 | if (!arg_type->is_error() |
e440a328 | 8914 | && !arg_type->is_string_type() |
8915 | && arg_type->array_type() == NULL | |
8916 | && arg_type->map_type() == NULL | |
8917 | && arg_type->channel_type() == NULL) | |
8918 | this->report_error(_("argument must be string or " | |
8919 | "array or slice or map or channel")); | |
8920 | } | |
8921 | } | |
8922 | } | |
8923 | break; | |
8924 | ||
8925 | case BUILTIN_PRINT: | |
8926 | case BUILTIN_PRINTLN: | |
8927 | { | |
8928 | const Expression_list* args = this->args(); | |
8929 | if (args == NULL) | |
8930 | { | |
8931 | if (this->code_ == BUILTIN_PRINT) | |
631d5788 | 8932 | go_warning_at(this->location(), 0, |
e440a328 | 8933 | "no arguments for builtin function %<%s%>", |
8934 | (this->code_ == BUILTIN_PRINT | |
8935 | ? "print" | |
8936 | : "println")); | |
8937 | } | |
8938 | else | |
8939 | { | |
8940 | for (Expression_list::const_iterator p = args->begin(); | |
8941 | p != args->end(); | |
8942 | ++p) | |
8943 | { | |
8944 | Type* type = (*p)->type(); | |
5c13bd80 | 8945 | if (type->is_error() |
e440a328 | 8946 | || type->is_string_type() |
8947 | || type->integer_type() != NULL | |
8948 | || type->float_type() != NULL | |
8949 | || type->complex_type() != NULL | |
8950 | || type->is_boolean_type() | |
8951 | || type->points_to() != NULL | |
8952 | || type->interface_type() != NULL | |
8953 | || type->channel_type() != NULL | |
8954 | || type->map_type() != NULL | |
8955 | || type->function_type() != NULL | |
411eb89e | 8956 | || type->is_slice_type()) |
e440a328 | 8957 | ; |
acf8e158 | 8958 | else if ((*p)->is_type_expression()) |
8959 | { | |
8960 | // If this is a type expression it's going to give | |
8961 | // an error anyhow, so we don't need one here. | |
8962 | } | |
e440a328 | 8963 | else |
8964 | this->report_error(_("unsupported argument type to " | |
8965 | "builtin function")); | |
8966 | } | |
8967 | } | |
8968 | } | |
8969 | break; | |
8970 | ||
8971 | case BUILTIN_CLOSE: | |
e440a328 | 8972 | if (this->check_one_arg()) |
8973 | { | |
8974 | if (this->one_arg()->type()->channel_type() == NULL) | |
8975 | this->report_error(_("argument must be channel")); | |
5202d986 | 8976 | else if (!this->one_arg()->type()->channel_type()->may_send()) |
8977 | this->report_error(_("cannot close receive-only channel")); | |
e440a328 | 8978 | } |
8979 | break; | |
8980 | ||
8981 | case BUILTIN_PANIC: | |
8982 | case BUILTIN_SIZEOF: | |
8983 | case BUILTIN_ALIGNOF: | |
8984 | this->check_one_arg(); | |
8985 | break; | |
8986 | ||
8987 | case BUILTIN_RECOVER: | |
6334270b | 8988 | if (this->args() != NULL |
8989 | && !this->args()->empty() | |
8990 | && !this->recover_arg_is_set_) | |
e440a328 | 8991 | this->report_error(_("too many arguments")); |
8992 | break; | |
8993 | ||
8994 | case BUILTIN_OFFSETOF: | |
8995 | if (this->check_one_arg()) | |
8996 | { | |
8997 | Expression* arg = this->one_arg(); | |
8998 | if (arg->field_reference_expression() == NULL) | |
8999 | this->report_error(_("argument must be a field reference")); | |
9000 | } | |
9001 | break; | |
9002 | ||
9003 | case BUILTIN_COPY: | |
9004 | { | |
9005 | const Expression_list* args = this->args(); | |
9006 | if (args == NULL || args->size() < 2) | |
9007 | { | |
9008 | this->report_error(_("not enough arguments")); | |
9009 | break; | |
9010 | } | |
9011 | else if (args->size() > 2) | |
9012 | { | |
9013 | this->report_error(_("too many arguments")); | |
9014 | break; | |
9015 | } | |
9016 | Type* arg1_type = args->front()->type(); | |
9017 | Type* arg2_type = args->back()->type(); | |
5c13bd80 | 9018 | if (arg1_type->is_error() || arg2_type->is_error()) |
6bebb39d | 9019 | { |
9020 | this->set_is_error(); | |
9021 | break; | |
9022 | } | |
e440a328 | 9023 | |
9024 | Type* e1; | |
411eb89e | 9025 | if (arg1_type->is_slice_type()) |
e440a328 | 9026 | e1 = arg1_type->array_type()->element_type(); |
9027 | else | |
9028 | { | |
9029 | this->report_error(_("left argument must be a slice")); | |
9030 | break; | |
9031 | } | |
9032 | ||
411eb89e | 9033 | if (arg2_type->is_slice_type()) |
60963afd | 9034 | { |
9035 | Type* e2 = arg2_type->array_type()->element_type(); | |
3a522dcc | 9036 | if (!Type::are_identical(e1, e2, Type::COMPARE_TAGS, NULL)) |
60963afd | 9037 | this->report_error(_("element types must be the same")); |
9038 | } | |
e440a328 | 9039 | else if (arg2_type->is_string_type()) |
e440a328 | 9040 | { |
60963afd | 9041 | if (e1->integer_type() == NULL || !e1->integer_type()->is_byte()) |
9042 | this->report_error(_("first argument must be []byte")); | |
e440a328 | 9043 | } |
60963afd | 9044 | else |
9045 | this->report_error(_("second argument must be slice or string")); | |
e440a328 | 9046 | } |
9047 | break; | |
9048 | ||
9049 | case BUILTIN_APPEND: | |
9050 | { | |
9051 | const Expression_list* args = this->args(); | |
321e5ad2 | 9052 | if (args == NULL || args->empty()) |
e440a328 | 9053 | { |
9054 | this->report_error(_("not enough arguments")); | |
9055 | break; | |
9056 | } | |
321e5ad2 | 9057 | |
9058 | Type* slice_type = args->front()->type(); | |
9059 | if (!slice_type->is_slice_type()) | |
6bebb39d | 9060 | { |
321e5ad2 | 9061 | if (slice_type->is_error_type()) |
9062 | break; | |
9063 | if (slice_type->is_nil_type()) | |
9064 | go_error_at(args->front()->location(), "use of untyped nil"); | |
9065 | else | |
9066 | go_error_at(args->front()->location(), | |
9067 | "argument 1 must be a slice"); | |
6bebb39d | 9068 | this->set_is_error(); |
9069 | break; | |
9070 | } | |
cd238b8d | 9071 | |
321e5ad2 | 9072 | Type* element_type = slice_type->array_type()->element_type(); |
22deed0d | 9073 | if (!element_type->in_heap()) |
9074 | go_error_at(args->front()->location(), | |
9075 | "can't append to slice of go:notinheap type"); | |
321e5ad2 | 9076 | if (this->is_varargs()) |
4fd4fcf4 | 9077 | { |
321e5ad2 | 9078 | if (!args->back()->type()->is_slice_type() |
9079 | && !args->back()->type()->is_string_type()) | |
9080 | { | |
9081 | go_error_at(args->back()->location(), | |
9082 | "invalid use of %<...%> with non-slice/non-string"); | |
9083 | this->set_is_error(); | |
9084 | break; | |
9085 | } | |
4fd4fcf4 | 9086 | |
321e5ad2 | 9087 | if (args->size() < 2) |
9088 | { | |
9089 | this->report_error(_("not enough arguments")); | |
9090 | break; | |
9091 | } | |
9092 | if (args->size() > 2) | |
9093 | { | |
9094 | this->report_error(_("too many arguments")); | |
9095 | break; | |
9096 | } | |
9097 | ||
9098 | if (args->back()->type()->is_string_type() | |
9099 | && element_type->integer_type() != NULL | |
9100 | && element_type->integer_type()->is_byte()) | |
9101 | { | |
9102 | // Permit append(s1, s2...) when s1 is a slice of | |
9103 | // bytes and s2 is a string type. | |
9104 | } | |
e440a328 | 9105 | else |
9106 | { | |
321e5ad2 | 9107 | // We have to test for assignment compatibility to a |
9108 | // slice of the element type, which is not necessarily | |
9109 | // the same as the type of the first argument: the | |
9110 | // first argument might have a named type. | |
9111 | Type* check_type = Type::make_array_type(element_type, NULL); | |
9112 | std::string reason; | |
9113 | if (!Type::are_assignable(check_type, args->back()->type(), | |
9114 | &reason)) | |
9115 | { | |
9116 | if (reason.empty()) | |
9117 | go_error_at(args->back()->location(), | |
9118 | "argument 2 has invalid type"); | |
9119 | else | |
9120 | go_error_at(args->back()->location(), | |
9121 | "argument 2 has invalid type (%s)", | |
9122 | reason.c_str()); | |
9123 | this->set_is_error(); | |
9124 | break; | |
9125 | } | |
9126 | } | |
9127 | } | |
9128 | else | |
9129 | { | |
9130 | Expression_list::const_iterator pa = args->begin(); | |
9131 | int i = 2; | |
9132 | for (++pa; pa != args->end(); ++pa, ++i) | |
9133 | { | |
9134 | std::string reason; | |
9135 | if (!Type::are_assignable(element_type, (*pa)->type(), | |
9136 | &reason)) | |
9137 | { | |
9138 | if (reason.empty()) | |
9139 | go_error_at((*pa)->location(), | |
9140 | "argument %d has incompatible type", i); | |
9141 | else | |
9142 | go_error_at((*pa)->location(), | |
9143 | "argument %d has incompatible type (%s)", | |
9144 | i, reason.c_str()); | |
9145 | this->set_is_error(); | |
9146 | } | |
e440a328 | 9147 | } |
9148 | } | |
e440a328 | 9149 | } |
321e5ad2 | 9150 | break; |
e440a328 | 9151 | |
9152 | case BUILTIN_REAL: | |
9153 | case BUILTIN_IMAG: | |
9154 | if (this->check_one_arg()) | |
9155 | { | |
9156 | if (this->one_arg()->type()->complex_type() == NULL) | |
9157 | this->report_error(_("argument must have complex type")); | |
9158 | } | |
9159 | break; | |
9160 | ||
48080209 | 9161 | case BUILTIN_COMPLEX: |
e440a328 | 9162 | { |
9163 | const Expression_list* args = this->args(); | |
9164 | if (args == NULL || args->size() < 2) | |
9165 | this->report_error(_("not enough arguments")); | |
9166 | else if (args->size() > 2) | |
9167 | this->report_error(_("too many arguments")); | |
9168 | else if (args->front()->is_error_expression() | |
5c13bd80 | 9169 | || args->front()->type()->is_error() |
e440a328 | 9170 | || args->back()->is_error_expression() |
5c13bd80 | 9171 | || args->back()->type()->is_error()) |
e440a328 | 9172 | this->set_is_error(); |
9173 | else if (!Type::are_identical(args->front()->type(), | |
3a522dcc | 9174 | args->back()->type(), |
9175 | Type::COMPARE_TAGS, NULL)) | |
48080209 | 9176 | this->report_error(_("complex arguments must have identical types")); |
e440a328 | 9177 | else if (args->front()->type()->float_type() == NULL) |
48080209 | 9178 | this->report_error(_("complex arguments must have " |
e440a328 | 9179 | "floating-point type")); |
9180 | } | |
9181 | break; | |
9182 | ||
9183 | default: | |
c3e6f413 | 9184 | go_unreachable(); |
e440a328 | 9185 | } |
9186 | } | |
9187 | ||
72666aed | 9188 | Expression* |
9189 | Builtin_call_expression::do_copy() | |
9190 | { | |
9191 | Call_expression* bce = | |
9192 | new Builtin_call_expression(this->gogo_, this->fn()->copy(), | |
da244e59 | 9193 | (this->args() == NULL |
9194 | ? NULL | |
9195 | : this->args()->copy()), | |
72666aed | 9196 | this->is_varargs(), |
9197 | this->location()); | |
9198 | ||
9199 | if (this->varargs_are_lowered()) | |
9200 | bce->set_varargs_are_lowered(); | |
28819633 | 9201 | if (this->is_deferred()) |
9202 | bce->set_is_deferred(); | |
9203 | if (this->is_concurrent()) | |
9204 | bce->set_is_concurrent(); | |
72666aed | 9205 | return bce; |
9206 | } | |
9207 | ||
ea664253 | 9208 | // Return the backend representation for a builtin function. |
e440a328 | 9209 | |
ea664253 | 9210 | Bexpression* |
9211 | Builtin_call_expression::do_get_backend(Translate_context* context) | |
e440a328 | 9212 | { |
9213 | Gogo* gogo = context->gogo(); | |
b13c66cd | 9214 | Location location = this->location(); |
a0d8874e | 9215 | |
9216 | if (this->is_erroneous_call()) | |
9217 | { | |
9218 | go_assert(saw_errors()); | |
9219 | return gogo->backend()->error_expression(); | |
9220 | } | |
9221 | ||
e440a328 | 9222 | switch (this->code_) |
9223 | { | |
9224 | case BUILTIN_INVALID: | |
9225 | case BUILTIN_NEW: | |
9226 | case BUILTIN_MAKE: | |
c3e6f413 | 9227 | go_unreachable(); |
e440a328 | 9228 | |
9229 | case BUILTIN_LEN: | |
9230 | case BUILTIN_CAP: | |
9231 | { | |
9232 | const Expression_list* args = this->args(); | |
c484d925 | 9233 | go_assert(args != NULL && args->size() == 1); |
2c809f8f | 9234 | Expression* arg = args->front(); |
e440a328 | 9235 | Type* arg_type = arg->type(); |
0f914071 | 9236 | |
9237 | if (this->seen_) | |
9238 | { | |
c484d925 | 9239 | go_assert(saw_errors()); |
ea664253 | 9240 | return context->backend()->error_expression(); |
0f914071 | 9241 | } |
9242 | this->seen_ = true; | |
0f914071 | 9243 | this->seen_ = false; |
e440a328 | 9244 | if (arg_type->points_to() != NULL) |
9245 | { | |
9246 | arg_type = arg_type->points_to(); | |
c484d925 | 9247 | go_assert(arg_type->array_type() != NULL |
411eb89e | 9248 | && !arg_type->is_slice_type()); |
f614ea8b | 9249 | arg = Expression::make_dereference(arg, NIL_CHECK_DEFAULT, |
9250 | location); | |
e440a328 | 9251 | } |
9252 | ||
1b1f2abf | 9253 | Type* int_type = Type::lookup_integer_type("int"); |
2c809f8f | 9254 | Expression* val; |
e440a328 | 9255 | if (this->code_ == BUILTIN_LEN) |
9256 | { | |
9257 | if (arg_type->is_string_type()) | |
2c809f8f | 9258 | val = Expression::make_string_info(arg, STRING_INFO_LENGTH, |
9259 | location); | |
e440a328 | 9260 | else if (arg_type->array_type() != NULL) |
0f914071 | 9261 | { |
9262 | if (this->seen_) | |
9263 | { | |
c484d925 | 9264 | go_assert(saw_errors()); |
ea664253 | 9265 | return context->backend()->error_expression(); |
0f914071 | 9266 | } |
9267 | this->seen_ = true; | |
2c809f8f | 9268 | val = arg_type->array_type()->get_length(gogo, arg); |
0f914071 | 9269 | this->seen_ = false; |
9270 | } | |
0d5530d9 | 9271 | else if (arg_type->map_type() != NULL |
9272 | || arg_type->channel_type() != NULL) | |
9273 | { | |
9274 | // The first field is the length. If the pointer is | |
9275 | // nil, the length is zero. | |
9276 | Type* pint_type = Type::make_pointer_type(int_type); | |
9277 | arg = Expression::make_unsafe_cast(pint_type, arg, location); | |
9278 | Expression* nil = Expression::make_nil(location); | |
9279 | nil = Expression::make_cast(pint_type, nil, location); | |
9280 | Expression* cmp = Expression::make_binary(OPERATOR_EQEQ, | |
9281 | arg, nil, location); | |
9282 | Expression* zero = Expression::make_integer_ul(0, int_type, | |
9283 | location); | |
f614ea8b | 9284 | Expression* indir = |
9285 | Expression::make_dereference(arg, NIL_CHECK_NOT_NEEDED, | |
9286 | location); | |
0d5530d9 | 9287 | val = Expression::make_conditional(cmp, zero, indir, location); |
9288 | } | |
e440a328 | 9289 | else |
c3e6f413 | 9290 | go_unreachable(); |
e440a328 | 9291 | } |
9292 | else | |
9293 | { | |
9294 | if (arg_type->array_type() != NULL) | |
0f914071 | 9295 | { |
9296 | if (this->seen_) | |
9297 | { | |
c484d925 | 9298 | go_assert(saw_errors()); |
ea664253 | 9299 | return context->backend()->error_expression(); |
0f914071 | 9300 | } |
9301 | this->seen_ = true; | |
2c809f8f | 9302 | val = arg_type->array_type()->get_capacity(gogo, arg); |
0f914071 | 9303 | this->seen_ = false; |
9304 | } | |
e440a328 | 9305 | else if (arg_type->channel_type() != NULL) |
132ed071 | 9306 | { |
9307 | // The second field is the capacity. If the pointer | |
9308 | // is nil, the capacity is zero. | |
9309 | Type* uintptr_type = Type::lookup_integer_type("uintptr"); | |
9310 | Type* pint_type = Type::make_pointer_type(int_type); | |
9311 | Expression* parg = Expression::make_unsafe_cast(uintptr_type, | |
9312 | arg, | |
9313 | location); | |
9314 | int off = int_type->integer_type()->bits() / 8; | |
9315 | Expression* eoff = Expression::make_integer_ul(off, | |
9316 | uintptr_type, | |
9317 | location); | |
9318 | parg = Expression::make_binary(OPERATOR_PLUS, parg, eoff, | |
9319 | location); | |
9320 | parg = Expression::make_unsafe_cast(pint_type, parg, location); | |
9321 | Expression* nil = Expression::make_nil(location); | |
9322 | nil = Expression::make_cast(pint_type, nil, location); | |
9323 | Expression* cmp = Expression::make_binary(OPERATOR_EQEQ, | |
9324 | arg, nil, location); | |
9325 | Expression* zero = Expression::make_integer_ul(0, int_type, | |
9326 | location); | |
f614ea8b | 9327 | Expression* indir = |
9328 | Expression::make_dereference(parg, NIL_CHECK_NOT_NEEDED, | |
9329 | location); | |
132ed071 | 9330 | val = Expression::make_conditional(cmp, zero, indir, location); |
9331 | } | |
e440a328 | 9332 | else |
c3e6f413 | 9333 | go_unreachable(); |
e440a328 | 9334 | } |
9335 | ||
2c809f8f | 9336 | return Expression::make_cast(int_type, val, |
ea664253 | 9337 | location)->get_backend(context); |
e440a328 | 9338 | } |
9339 | ||
9340 | case BUILTIN_PRINT: | |
9341 | case BUILTIN_PRINTLN: | |
9342 | { | |
9343 | const bool is_ln = this->code_ == BUILTIN_PRINTLN; | |
88b03a70 | 9344 | |
9345 | Expression* print_stmts = Runtime::make_call(Runtime::PRINTLOCK, | |
9346 | location, 0); | |
e440a328 | 9347 | |
9348 | const Expression_list* call_args = this->args(); | |
9349 | if (call_args != NULL) | |
9350 | { | |
9351 | for (Expression_list::const_iterator p = call_args->begin(); | |
9352 | p != call_args->end(); | |
9353 | ++p) | |
9354 | { | |
9355 | if (is_ln && p != call_args->begin()) | |
9356 | { | |
2c809f8f | 9357 | Expression* print_space = |
88b03a70 | 9358 | Runtime::make_call(Runtime::PRINTSP, location, 0); |
e440a328 | 9359 | |
2c809f8f | 9360 | print_stmts = |
9361 | Expression::make_compound(print_stmts, print_space, | |
9362 | location); | |
9363 | } | |
e440a328 | 9364 | |
2c809f8f | 9365 | Expression* arg = *p; |
9366 | Type* type = arg->type(); | |
9367 | Runtime::Function code; | |
e440a328 | 9368 | if (type->is_string_type()) |
88b03a70 | 9369 | code = Runtime::PRINTSTRING; |
e440a328 | 9370 | else if (type->integer_type() != NULL |
9371 | && type->integer_type()->is_unsigned()) | |
9372 | { | |
e440a328 | 9373 | Type* itype = Type::lookup_integer_type("uint64"); |
2c809f8f | 9374 | arg = Expression::make_cast(itype, arg, location); |
88b03a70 | 9375 | code = Runtime::PRINTUINT; |
e440a328 | 9376 | } |
9377 | else if (type->integer_type() != NULL) | |
9378 | { | |
e440a328 | 9379 | Type* itype = Type::lookup_integer_type("int64"); |
2c809f8f | 9380 | arg = Expression::make_cast(itype, arg, location); |
88b03a70 | 9381 | code = Runtime::PRINTINT; |
e440a328 | 9382 | } |
9383 | else if (type->float_type() != NULL) | |
9384 | { | |
2c809f8f | 9385 | Type* dtype = Type::lookup_float_type("float64"); |
9386 | arg = Expression::make_cast(dtype, arg, location); | |
88b03a70 | 9387 | code = Runtime::PRINTFLOAT; |
e440a328 | 9388 | } |
9389 | else if (type->complex_type() != NULL) | |
9390 | { | |
2c809f8f | 9391 | Type* ctype = Type::lookup_complex_type("complex128"); |
9392 | arg = Expression::make_cast(ctype, arg, location); | |
88b03a70 | 9393 | code = Runtime::PRINTCOMPLEX; |
e440a328 | 9394 | } |
9395 | else if (type->is_boolean_type()) | |
88b03a70 | 9396 | code = Runtime::PRINTBOOL; |
e440a328 | 9397 | else if (type->points_to() != NULL |
9398 | || type->channel_type() != NULL | |
9399 | || type->map_type() != NULL | |
9400 | || type->function_type() != NULL) | |
9401 | { | |
2c809f8f | 9402 | arg = Expression::make_cast(type, arg, location); |
88b03a70 | 9403 | code = Runtime::PRINTPOINTER; |
e440a328 | 9404 | } |
9405 | else if (type->interface_type() != NULL) | |
9406 | { | |
9407 | if (type->interface_type()->is_empty()) | |
88b03a70 | 9408 | code = Runtime::PRINTEFACE; |
e440a328 | 9409 | else |
88b03a70 | 9410 | code = Runtime::PRINTIFACE; |
e440a328 | 9411 | } |
411eb89e | 9412 | else if (type->is_slice_type()) |
88b03a70 | 9413 | code = Runtime::PRINTSLICE; |
e440a328 | 9414 | else |
cd238b8d | 9415 | { |
9416 | go_assert(saw_errors()); | |
ea664253 | 9417 | return context->backend()->error_expression(); |
cd238b8d | 9418 | } |
e440a328 | 9419 | |
2c809f8f | 9420 | Expression* call = Runtime::make_call(code, location, 1, arg); |
88b03a70 | 9421 | print_stmts = Expression::make_compound(print_stmts, call, |
9422 | location); | |
e440a328 | 9423 | } |
9424 | } | |
9425 | ||
9426 | if (is_ln) | |
9427 | { | |
2c809f8f | 9428 | Expression* print_nl = |
88b03a70 | 9429 | Runtime::make_call(Runtime::PRINTNL, location, 0); |
9430 | print_stmts = Expression::make_compound(print_stmts, print_nl, | |
9431 | location); | |
e440a328 | 9432 | } |
9433 | ||
88b03a70 | 9434 | Expression* unlock = Runtime::make_call(Runtime::PRINTUNLOCK, |
9435 | location, 0); | |
9436 | print_stmts = Expression::make_compound(print_stmts, unlock, location); | |
32e3ff69 | 9437 | |
ea664253 | 9438 | return print_stmts->get_backend(context); |
e440a328 | 9439 | } |
9440 | ||
9441 | case BUILTIN_PANIC: | |
9442 | { | |
9443 | const Expression_list* args = this->args(); | |
c484d925 | 9444 | go_assert(args != NULL && args->size() == 1); |
e440a328 | 9445 | Expression* arg = args->front(); |
b13c66cd | 9446 | Type *empty = |
823c7e3d | 9447 | Type::make_empty_interface_type(Linemap::predeclared_location()); |
2c809f8f | 9448 | arg = Expression::convert_for_assignment(gogo, empty, arg, location); |
9449 | ||
9450 | Expression* panic = | |
03ac9de4 | 9451 | Runtime::make_call(Runtime::GOPANIC, location, 1, arg); |
ea664253 | 9452 | return panic->get_backend(context); |
e440a328 | 9453 | } |
9454 | ||
9455 | case BUILTIN_RECOVER: | |
9456 | { | |
9457 | // The argument is set when building recover thunks. It's a | |
9458 | // boolean value which is true if we can recover a value now. | |
9459 | const Expression_list* args = this->args(); | |
c484d925 | 9460 | go_assert(args != NULL && args->size() == 1); |
e440a328 | 9461 | Expression* arg = args->front(); |
b13c66cd | 9462 | Type *empty = |
823c7e3d | 9463 | Type::make_empty_interface_type(Linemap::predeclared_location()); |
e440a328 | 9464 | |
e440a328 | 9465 | Expression* nil = Expression::make_nil(location); |
2c809f8f | 9466 | nil = Expression::convert_for_assignment(gogo, empty, nil, location); |
e440a328 | 9467 | |
9468 | // We need to handle a deferred call to recover specially, | |
9469 | // because it changes whether it can recover a panic or not. | |
9470 | // See test7 in test/recover1.go. | |
2c809f8f | 9471 | Expression* recover = Runtime::make_call((this->is_deferred() |
03ac9de4 | 9472 | ? Runtime::DEFERREDRECOVER |
9473 | : Runtime::GORECOVER), | |
2c809f8f | 9474 | location, 0); |
9475 | Expression* cond = | |
9476 | Expression::make_conditional(arg, recover, nil, location); | |
ea664253 | 9477 | return cond->get_backend(context); |
e440a328 | 9478 | } |
9479 | ||
9480 | case BUILTIN_CLOSE: | |
e440a328 | 9481 | { |
9482 | const Expression_list* args = this->args(); | |
c484d925 | 9483 | go_assert(args != NULL && args->size() == 1); |
e440a328 | 9484 | Expression* arg = args->front(); |
2c809f8f | 9485 | Expression* close = Runtime::make_call(Runtime::CLOSE, location, |
9486 | 1, arg); | |
ea664253 | 9487 | return close->get_backend(context); |
e440a328 | 9488 | } |
9489 | ||
9490 | case BUILTIN_SIZEOF: | |
9491 | case BUILTIN_OFFSETOF: | |
9492 | case BUILTIN_ALIGNOF: | |
9493 | { | |
0c77715b | 9494 | Numeric_constant nc; |
9495 | unsigned long val; | |
9496 | if (!this->numeric_constant_value(&nc) | |
9497 | || nc.to_unsigned_long(&val) != Numeric_constant::NC_UL_VALID) | |
7f1d9abd | 9498 | { |
c484d925 | 9499 | go_assert(saw_errors()); |
ea664253 | 9500 | return context->backend()->error_expression(); |
7f1d9abd | 9501 | } |
7ba86326 | 9502 | Type* uintptr_type = Type::lookup_integer_type("uintptr"); |
2c809f8f | 9503 | mpz_t ival; |
9504 | nc.get_int(&ival); | |
9505 | Expression* int_cst = | |
e67508fa | 9506 | Expression::make_integer_z(&ival, uintptr_type, location); |
2c809f8f | 9507 | mpz_clear(ival); |
ea664253 | 9508 | return int_cst->get_backend(context); |
e440a328 | 9509 | } |
9510 | ||
9511 | case BUILTIN_COPY: | |
9512 | { | |
9513 | const Expression_list* args = this->args(); | |
c484d925 | 9514 | go_assert(args != NULL && args->size() == 2); |
e440a328 | 9515 | Expression* arg1 = args->front(); |
9516 | Expression* arg2 = args->back(); | |
9517 | ||
e440a328 | 9518 | Type* arg1_type = arg1->type(); |
9519 | Array_type* at = arg1_type->array_type(); | |
35a54f17 | 9520 | go_assert(arg1->is_variable()); |
321e5ad2 | 9521 | |
9522 | Expression* call; | |
e440a328 | 9523 | |
9524 | Type* arg2_type = arg2->type(); | |
2c809f8f | 9525 | go_assert(arg2->is_variable()); |
321e5ad2 | 9526 | if (arg2_type->is_string_type()) |
9527 | call = Runtime::make_call(Runtime::SLICESTRINGCOPY, location, | |
9528 | 2, arg1, arg2); | |
e440a328 | 9529 | else |
9530 | { | |
321e5ad2 | 9531 | Type* et = at->element_type(); |
9532 | if (et->has_pointer()) | |
9533 | { | |
9534 | Expression* td = Expression::make_type_descriptor(et, | |
9535 | location); | |
9536 | call = Runtime::make_call(Runtime::TYPEDSLICECOPY, location, | |
9537 | 3, td, arg1, arg2); | |
9538 | } | |
9539 | else | |
9540 | { | |
9541 | Expression* sz = Expression::make_type_info(et, | |
9542 | TYPE_INFO_SIZE); | |
9543 | call = Runtime::make_call(Runtime::SLICECOPY, location, 3, | |
9544 | arg1, arg2, sz); | |
9545 | } | |
e440a328 | 9546 | } |
2c809f8f | 9547 | |
321e5ad2 | 9548 | return call->get_backend(context); |
e440a328 | 9549 | } |
9550 | ||
9551 | case BUILTIN_APPEND: | |
321e5ad2 | 9552 | // Handled in Builtin_call_expression::flatten_append. |
9553 | go_unreachable(); | |
e440a328 | 9554 | |
9555 | case BUILTIN_REAL: | |
9556 | case BUILTIN_IMAG: | |
9557 | { | |
9558 | const Expression_list* args = this->args(); | |
c484d925 | 9559 | go_assert(args != NULL && args->size() == 1); |
2c809f8f | 9560 | |
9561 | Bexpression* ret; | |
ea664253 | 9562 | Bexpression* bcomplex = args->front()->get_backend(context); |
2c809f8f | 9563 | if (this->code_ == BUILTIN_REAL) |
9564 | ret = gogo->backend()->real_part_expression(bcomplex, location); | |
9565 | else | |
9566 | ret = gogo->backend()->imag_part_expression(bcomplex, location); | |
ea664253 | 9567 | return ret; |
e440a328 | 9568 | } |
9569 | ||
48080209 | 9570 | case BUILTIN_COMPLEX: |
e440a328 | 9571 | { |
9572 | const Expression_list* args = this->args(); | |
c484d925 | 9573 | go_assert(args != NULL && args->size() == 2); |
ea664253 | 9574 | Bexpression* breal = args->front()->get_backend(context); |
9575 | Bexpression* bimag = args->back()->get_backend(context); | |
9576 | return gogo->backend()->complex_expression(breal, bimag, location); | |
e440a328 | 9577 | } |
9578 | ||
9579 | default: | |
c3e6f413 | 9580 | go_unreachable(); |
e440a328 | 9581 | } |
9582 | } | |
9583 | ||
9584 | // We have to support exporting a builtin call expression, because | |
9585 | // code can set a constant to the result of a builtin expression. | |
9586 | ||
9587 | void | |
548be246 | 9588 | Builtin_call_expression::do_export(Export_function_body* efb) const |
e440a328 | 9589 | { |
0c77715b | 9590 | Numeric_constant nc; |
9591 | if (!this->numeric_constant_value(&nc)) | |
9592 | { | |
631d5788 | 9593 | go_error_at(this->location(), "value is not constant"); |
0c77715b | 9594 | return; |
9595 | } | |
e440a328 | 9596 | |
0c77715b | 9597 | if (nc.is_int()) |
e440a328 | 9598 | { |
0c77715b | 9599 | mpz_t val; |
9600 | nc.get_int(&val); | |
548be246 | 9601 | Integer_expression::export_integer(efb, val); |
0c77715b | 9602 | mpz_clear(val); |
e440a328 | 9603 | } |
0c77715b | 9604 | else if (nc.is_float()) |
e440a328 | 9605 | { |
9606 | mpfr_t fval; | |
0c77715b | 9607 | nc.get_float(&fval); |
548be246 | 9608 | Float_expression::export_float(efb, fval); |
e440a328 | 9609 | mpfr_clear(fval); |
9610 | } | |
0c77715b | 9611 | else if (nc.is_complex()) |
e440a328 | 9612 | { |
fcbea5e4 | 9613 | mpc_t cval; |
9614 | nc.get_complex(&cval); | |
548be246 | 9615 | Complex_expression::export_complex(efb, cval); |
fcbea5e4 | 9616 | mpc_clear(cval); |
e440a328 | 9617 | } |
0c77715b | 9618 | else |
9619 | go_unreachable(); | |
e440a328 | 9620 | |
9621 | // A trailing space lets us reliably identify the end of the number. | |
548be246 | 9622 | efb->write_c_string(" "); |
e440a328 | 9623 | } |
9624 | ||
9625 | // Class Call_expression. | |
9626 | ||
8381eda7 | 9627 | // A Go function can be viewed in a couple of different ways. The |
9628 | // code of a Go function becomes a backend function with parameters | |
9629 | // whose types are simply the backend representation of the Go types. | |
9630 | // If there are multiple results, they are returned as a backend | |
9631 | // struct. | |
9632 | ||
9633 | // However, when Go code refers to a function other than simply | |
9634 | // calling it, the backend type of that function is actually a struct. | |
9635 | // The first field of the struct points to the Go function code | |
9636 | // (sometimes a wrapper as described below). The remaining fields | |
9637 | // hold addresses of closed-over variables. This struct is called a | |
9638 | // closure. | |
9639 | ||
9640 | // There are a few cases to consider. | |
9641 | ||
9642 | // A direct function call of a known function in package scope. In | |
9643 | // this case there are no closed-over variables, and we know the name | |
9644 | // of the function code. We can simply produce a backend call to the | |
9645 | // function directly, and not worry about the closure. | |
9646 | ||
9647 | // A direct function call of a known function literal. In this case | |
9648 | // we know the function code and we know the closure. We generate the | |
9649 | // function code such that it expects an additional final argument of | |
9650 | // the closure type. We pass the closure as the last argument, after | |
9651 | // the other arguments. | |
9652 | ||
9653 | // An indirect function call. In this case we have a closure. We | |
9654 | // load the pointer to the function code from the first field of the | |
9655 | // closure. We pass the address of the closure as the last argument. | |
9656 | ||
9657 | // A call to a method of an interface. Type methods are always at | |
9658 | // package scope, so we call the function directly, and don't worry | |
9659 | // about the closure. | |
9660 | ||
9661 | // This means that for a function at package scope we have two cases. | |
9662 | // One is the direct call, which has no closure. The other is the | |
9663 | // indirect call, which does have a closure. We can't simply ignore | |
9664 | // the closure, even though it is the last argument, because that will | |
9665 | // fail on targets where the function pops its arguments. So when | |
9666 | // generating a closure for a package-scope function we set the | |
9667 | // function code pointer in the closure to point to a wrapper | |
9668 | // function. This wrapper function accepts a final argument that | |
9669 | // points to the closure, ignores it, and calls the real function as a | |
9670 | // direct function call. This wrapper will normally be efficient, and | |
9671 | // can often simply be a tail call to the real function. | |
9672 | ||
9673 | // We don't use GCC's static chain pointer because 1) we don't need | |
9674 | // it; 2) GCC only permits using a static chain to call a known | |
9675 | // function, so we can't use it for an indirect call anyhow. Since we | |
9676 | // can't use it for an indirect call, we may as well not worry about | |
9677 | // using it for a direct call either. | |
9678 | ||
9679 | // We pass the closure last rather than first because it means that | |
9680 | // the function wrapper we put into a closure for a package-scope | |
9681 | // function can normally just be a tail call to the real function. | |
9682 | ||
9683 | // For method expressions we generate a wrapper that loads the | |
9684 | // receiver from the closure and then calls the method. This | |
9685 | // unfortunately forces reshuffling the arguments, since there is a | |
9686 | // new first argument, but we can't avoid reshuffling either for | |
9687 | // method expressions or for indirect calls of package-scope | |
9688 | // functions, and since the latter are more common we reshuffle for | |
9689 | // method expressions. | |
9690 | ||
9691 | // Note that the Go code retains the Go types. The extra final | |
9692 | // argument only appears when we convert to the backend | |
9693 | // representation. | |
9694 | ||
e440a328 | 9695 | // Traversal. |
9696 | ||
9697 | int | |
9698 | Call_expression::do_traverse(Traverse* traverse) | |
9699 | { | |
0c0dacab | 9700 | // If we are calling a function in a different package that returns |
9701 | // an unnamed type, this may be the only chance we get to traverse | |
9702 | // that type. We don't traverse this->type_ because it may be a | |
9703 | // Call_multiple_result_type that will just lead back here. | |
9704 | if (this->type_ != NULL && !this->type_->is_error_type()) | |
9705 | { | |
9706 | Function_type *fntype = this->get_function_type(); | |
9707 | if (fntype != NULL && Type::traverse(fntype, traverse) == TRAVERSE_EXIT) | |
9708 | return TRAVERSE_EXIT; | |
9709 | } | |
e440a328 | 9710 | if (Expression::traverse(&this->fn_, traverse) == TRAVERSE_EXIT) |
9711 | return TRAVERSE_EXIT; | |
9712 | if (this->args_ != NULL) | |
9713 | { | |
9714 | if (this->args_->traverse(traverse) == TRAVERSE_EXIT) | |
9715 | return TRAVERSE_EXIT; | |
9716 | } | |
9717 | return TRAVERSE_CONTINUE; | |
9718 | } | |
9719 | ||
9720 | // Lower a call statement. | |
9721 | ||
9722 | Expression* | |
ceeb4318 | 9723 | Call_expression::do_lower(Gogo* gogo, Named_object* function, |
9724 | Statement_inserter* inserter, int) | |
e440a328 | 9725 | { |
b13c66cd | 9726 | Location loc = this->location(); |
09ea332d | 9727 | |
ceeb4318 | 9728 | // A type cast can look like a function call. |
e440a328 | 9729 | if (this->fn_->is_type_expression() |
9730 | && this->args_ != NULL | |
9731 | && this->args_->size() == 1) | |
9732 | return Expression::make_cast(this->fn_->type(), this->args_->front(), | |
09ea332d | 9733 | loc); |
e440a328 | 9734 | |
88f06749 | 9735 | // Because do_type will return an error type and thus prevent future |
9736 | // errors, check for that case now to ensure that the error gets | |
9737 | // reported. | |
37448b10 | 9738 | Function_type* fntype = this->get_function_type(); |
9739 | if (fntype == NULL) | |
88f06749 | 9740 | { |
9741 | if (!this->fn_->type()->is_error()) | |
9742 | this->report_error(_("expected function")); | |
5f1045b5 | 9743 | this->set_is_error(); |
9744 | return this; | |
88f06749 | 9745 | } |
9746 | ||
e440a328 | 9747 | // Handle an argument which is a call to a function which returns |
9748 | // multiple results. | |
9749 | if (this->args_ != NULL | |
9750 | && this->args_->size() == 1 | |
37448b10 | 9751 | && this->args_->front()->call_expression() != NULL) |
e440a328 | 9752 | { |
e440a328 | 9753 | size_t rc = this->args_->front()->call_expression()->result_count(); |
9754 | if (rc > 1 | |
37448b10 | 9755 | && ((fntype->parameters() != NULL |
9756 | && (fntype->parameters()->size() == rc | |
9757 | || (fntype->is_varargs() | |
9758 | && fntype->parameters()->size() - 1 <= rc))) | |
9759 | || fntype->is_builtin())) | |
e440a328 | 9760 | { |
9761 | Call_expression* call = this->args_->front()->call_expression(); | |
e90ecd2d | 9762 | call->set_is_multi_value_arg(); |
c33af8e4 | 9763 | if (this->is_varargs_) |
9764 | { | |
9765 | // It is not clear which result of a multiple result call | |
9766 | // the ellipsis operator should be applied to. If we unpack the | |
9767 | // the call into its individual results here, the ellipsis will be | |
9768 | // applied to the last result. | |
631d5788 | 9769 | go_error_at(call->location(), |
9770 | _("multiple-value argument in single-value context")); | |
c33af8e4 | 9771 | return Expression::make_error(call->location()); |
9772 | } | |
9773 | ||
e440a328 | 9774 | Expression_list* args = new Expression_list; |
9775 | for (size_t i = 0; i < rc; ++i) | |
9776 | args->push_back(Expression::make_call_result(call, i)); | |
9777 | // We can't return a new call expression here, because this | |
42535814 | 9778 | // one may be referenced by Call_result expressions. We |
9779 | // also can't delete the old arguments, because we may still | |
9780 | // traverse them somewhere up the call stack. FIXME. | |
e440a328 | 9781 | this->args_ = args; |
9782 | } | |
9783 | } | |
9784 | ||
37448b10 | 9785 | // Recognize a call to a builtin function. |
9786 | if (fntype->is_builtin()) | |
28819633 | 9787 | { |
9788 | Builtin_call_expression* bce = | |
9789 | new Builtin_call_expression(gogo, this->fn_, this->args_, | |
9790 | this->is_varargs_, loc); | |
9791 | if (this->is_deferred_) | |
9792 | bce->set_is_deferred(); | |
9793 | if (this->is_concurrent_) | |
9794 | bce->set_is_concurrent(); | |
9795 | return bce; | |
9796 | } | |
37448b10 | 9797 | |
ceeb4318 | 9798 | // If this call returns multiple results, create a temporary |
5731103c | 9799 | // variable to hold them. |
9800 | if (this->result_count() > 1 && this->call_temp_ == NULL) | |
ceeb4318 | 9801 | { |
5731103c | 9802 | Struct_field_list* sfl = new Struct_field_list(); |
9803 | Function_type* fntype = this->get_function_type(); | |
37448b10 | 9804 | const Typed_identifier_list* results = fntype->results(); |
5731103c | 9805 | Location loc = this->location(); |
9806 | ||
9807 | int i = 0; | |
9808 | char buf[20]; | |
ceeb4318 | 9809 | for (Typed_identifier_list::const_iterator p = results->begin(); |
5731103c | 9810 | p != results->end(); |
9811 | ++p, ++i) | |
9812 | { | |
9813 | snprintf(buf, sizeof buf, "res%d", i); | |
9814 | sfl->push_back(Struct_field(Typed_identifier(buf, p->type(), loc))); | |
9815 | } | |
9816 | ||
9817 | Struct_type* st = Type::make_struct_type(sfl, loc); | |
9818 | st->set_is_struct_incomparable(); | |
9819 | this->call_temp_ = Statement::make_temporary(st, NULL, loc); | |
9820 | inserter->insert(this->call_temp_); | |
ceeb4318 | 9821 | } |
9822 | ||
e440a328 | 9823 | // Handle a call to a varargs function by packaging up the extra |
9824 | // parameters. | |
37448b10 | 9825 | if (fntype->is_varargs()) |
e440a328 | 9826 | { |
e440a328 | 9827 | const Typed_identifier_list* parameters = fntype->parameters(); |
c484d925 | 9828 | go_assert(parameters != NULL && !parameters->empty()); |
e440a328 | 9829 | Type* varargs_type = parameters->back().type(); |
09ea332d | 9830 | this->lower_varargs(gogo, function, inserter, varargs_type, |
0e9a2e72 | 9831 | parameters->size(), SLICE_STORAGE_MAY_ESCAPE); |
09ea332d | 9832 | } |
9833 | ||
9834 | // If this is call to a method, call the method directly passing the | |
9835 | // object as the first parameter. | |
9836 | Bound_method_expression* bme = this->fn_->bound_method_expression(); | |
9837 | if (bme != NULL) | |
9838 | { | |
0afbb937 | 9839 | Named_object* methodfn = bme->function(); |
09ea332d | 9840 | Expression* first_arg = bme->first_argument(); |
9841 | ||
9842 | // We always pass a pointer when calling a method. | |
9843 | if (first_arg->type()->points_to() == NULL | |
9844 | && !first_arg->type()->is_error()) | |
9845 | { | |
9846 | first_arg = Expression::make_unary(OPERATOR_AND, first_arg, loc); | |
9847 | // We may need to create a temporary variable so that we can | |
9848 | // take the address. We can't do that here because it will | |
9849 | // mess up the order of evaluation. | |
9850 | Unary_expression* ue = static_cast<Unary_expression*>(first_arg); | |
9851 | ue->set_create_temp(); | |
9852 | } | |
9853 | ||
9854 | // If we are calling a method which was inherited from an | |
9855 | // embedded struct, and the method did not get a stub, then the | |
9856 | // first type may be wrong. | |
9857 | Type* fatype = bme->first_argument_type(); | |
9858 | if (fatype != NULL) | |
9859 | { | |
9860 | if (fatype->points_to() == NULL) | |
9861 | fatype = Type::make_pointer_type(fatype); | |
9862 | first_arg = Expression::make_unsafe_cast(fatype, first_arg, loc); | |
9863 | } | |
9864 | ||
9865 | Expression_list* new_args = new Expression_list(); | |
9866 | new_args->push_back(first_arg); | |
9867 | if (this->args_ != NULL) | |
9868 | { | |
9869 | for (Expression_list::const_iterator p = this->args_->begin(); | |
9870 | p != this->args_->end(); | |
9871 | ++p) | |
9872 | new_args->push_back(*p); | |
9873 | } | |
9874 | ||
9875 | // We have to change in place because this structure may be | |
9876 | // referenced by Call_result_expressions. We can't delete the | |
9877 | // old arguments, because we may be traversing them up in some | |
9878 | // caller. FIXME. | |
9879 | this->args_ = new_args; | |
0afbb937 | 9880 | this->fn_ = Expression::make_func_reference(methodfn, NULL, |
09ea332d | 9881 | bme->location()); |
e440a328 | 9882 | } |
9883 | ||
105f9a24 | 9884 | // Handle a couple of special runtime functions. In the runtime |
9885 | // package, getcallerpc returns the PC of the caller, and | |
9886 | // getcallersp returns the frame pointer of the caller. Implement | |
9887 | // these by turning them into calls to GCC builtin functions. We | |
9888 | // could implement them in normal code, but then we would have to | |
9889 | // explicitly unwind the stack. These functions are intended to be | |
9890 | // efficient. Note that this technique obviously only works for | |
33d1d391 | 9891 | // direct calls, but that is the only way they are used. |
9892 | if (gogo->compiling_runtime() && gogo->package_name() == "runtime") | |
105f9a24 | 9893 | { |
9894 | Func_expression* fe = this->fn_->func_expression(); | |
9895 | if (fe != NULL | |
9896 | && fe->named_object()->is_function_declaration() | |
9897 | && fe->named_object()->package() == NULL) | |
9898 | { | |
9899 | std::string n = Gogo::unpack_hidden_name(fe->named_object()->name()); | |
33d1d391 | 9900 | if ((this->args_ == NULL || this->args_->size() == 0) |
9901 | && n == "getcallerpc") | |
105f9a24 | 9902 | { |
9903 | static Named_object* builtin_return_address; | |
9904 | return this->lower_to_builtin(&builtin_return_address, | |
9905 | "__builtin_return_address", | |
9906 | 0); | |
9907 | } | |
b5665f52 | 9908 | else if ((this->args_ == NULL || this->args_->size() == 0) |
33d1d391 | 9909 | && n == "getcallersp") |
105f9a24 | 9910 | { |
9911 | static Named_object* builtin_frame_address; | |
9912 | return this->lower_to_builtin(&builtin_frame_address, | |
9913 | "__builtin_frame_address", | |
9914 | 1); | |
9915 | } | |
9916 | } | |
9917 | } | |
9918 | ||
81affb1d | 9919 | // If this is a call to an imported function for which we have an |
9920 | // inlinable function body, add it to the list of functions to give | |
9921 | // to the backend as inlining opportunities. | |
9922 | Func_expression* fe = this->fn_->func_expression(); | |
9923 | if (fe != NULL | |
9924 | && fe->named_object()->is_function_declaration() | |
9925 | && fe->named_object()->func_declaration_value()->has_imported_body()) | |
9926 | gogo->add_imported_inlinable_function(fe->named_object()); | |
9927 | ||
e440a328 | 9928 | return this; |
9929 | } | |
9930 | ||
9931 | // Lower a call to a varargs function. FUNCTION is the function in | |
9932 | // which the call occurs--it's not the function we are calling. | |
9933 | // VARARGS_TYPE is the type of the varargs parameter, a slice type. | |
9934 | // PARAM_COUNT is the number of parameters of the function we are | |
9935 | // calling; the last of these parameters will be the varargs | |
9936 | // parameter. | |
9937 | ||
09ea332d | 9938 | void |
e440a328 | 9939 | Call_expression::lower_varargs(Gogo* gogo, Named_object* function, |
ceeb4318 | 9940 | Statement_inserter* inserter, |
0e9a2e72 | 9941 | Type* varargs_type, size_t param_count, |
9942 | Slice_storage_escape_disp escape_disp) | |
e440a328 | 9943 | { |
9944 | if (this->varargs_are_lowered_) | |
09ea332d | 9945 | return; |
e440a328 | 9946 | |
b13c66cd | 9947 | Location loc = this->location(); |
e440a328 | 9948 | |
c484d925 | 9949 | go_assert(param_count > 0); |
411eb89e | 9950 | go_assert(varargs_type->is_slice_type()); |
e440a328 | 9951 | |
9952 | size_t arg_count = this->args_ == NULL ? 0 : this->args_->size(); | |
9953 | if (arg_count < param_count - 1) | |
9954 | { | |
9955 | // Not enough arguments; will be caught in check_types. | |
09ea332d | 9956 | return; |
e440a328 | 9957 | } |
9958 | ||
9959 | Expression_list* old_args = this->args_; | |
9960 | Expression_list* new_args = new Expression_list(); | |
9961 | bool push_empty_arg = false; | |
9962 | if (old_args == NULL || old_args->empty()) | |
9963 | { | |
c484d925 | 9964 | go_assert(param_count == 1); |
e440a328 | 9965 | push_empty_arg = true; |
9966 | } | |
9967 | else | |
9968 | { | |
9969 | Expression_list::const_iterator pa; | |
9970 | int i = 1; | |
9971 | for (pa = old_args->begin(); pa != old_args->end(); ++pa, ++i) | |
9972 | { | |
9973 | if (static_cast<size_t>(i) == param_count) | |
9974 | break; | |
9975 | new_args->push_back(*pa); | |
9976 | } | |
9977 | ||
9978 | // We have reached the varargs parameter. | |
9979 | ||
9980 | bool issued_error = false; | |
9981 | if (pa == old_args->end()) | |
9982 | push_empty_arg = true; | |
9983 | else if (pa + 1 == old_args->end() && this->is_varargs_) | |
9984 | new_args->push_back(*pa); | |
9985 | else if (this->is_varargs_) | |
9986 | { | |
a6645f74 | 9987 | if ((*pa)->type()->is_slice_type()) |
9988 | this->report_error(_("too many arguments")); | |
9989 | else | |
9990 | { | |
631d5788 | 9991 | go_error_at(this->location(), |
9992 | _("invalid use of %<...%> with non-slice")); | |
a6645f74 | 9993 | this->set_is_error(); |
9994 | } | |
09ea332d | 9995 | return; |
e440a328 | 9996 | } |
e440a328 | 9997 | else |
9998 | { | |
9999 | Type* element_type = varargs_type->array_type()->element_type(); | |
10000 | Expression_list* vals = new Expression_list; | |
10001 | for (; pa != old_args->end(); ++pa, ++i) | |
10002 | { | |
10003 | // Check types here so that we get a better message. | |
10004 | Type* patype = (*pa)->type(); | |
b13c66cd | 10005 | Location paloc = (*pa)->location(); |
e440a328 | 10006 | if (!this->check_argument_type(i, element_type, patype, |
10007 | paloc, issued_error)) | |
10008 | continue; | |
10009 | vals->push_back(*pa); | |
10010 | } | |
0e9a2e72 | 10011 | Slice_construction_expression* sce = |
e440a328 | 10012 | Expression::make_slice_composite_literal(varargs_type, vals, loc); |
0e9a2e72 | 10013 | if (escape_disp == SLICE_STORAGE_DOES_NOT_ESCAPE) |
10014 | sce->set_storage_does_not_escape(); | |
10015 | Expression* val = sce; | |
09ea332d | 10016 | gogo->lower_expression(function, inserter, &val); |
e440a328 | 10017 | new_args->push_back(val); |
10018 | } | |
10019 | } | |
10020 | ||
10021 | if (push_empty_arg) | |
10022 | new_args->push_back(Expression::make_nil(loc)); | |
10023 | ||
10024 | // We can't return a new call expression here, because this one may | |
6d4c2432 | 10025 | // be referenced by Call_result expressions. FIXME. We can't |
10026 | // delete OLD_ARGS because we may have both a Call_expression and a | |
10027 | // Builtin_call_expression which refer to them. FIXME. | |
e440a328 | 10028 | this->args_ = new_args; |
10029 | this->varargs_are_lowered_ = true; | |
e440a328 | 10030 | } |
10031 | ||
105f9a24 | 10032 | // Return a call to __builtin_return_address or __builtin_frame_address. |
10033 | ||
10034 | Expression* | |
10035 | Call_expression::lower_to_builtin(Named_object** pno, const char* name, | |
10036 | int arg) | |
10037 | { | |
10038 | if (*pno == NULL) | |
10039 | *pno = Gogo::declare_builtin_rf_address(name); | |
10040 | ||
10041 | Location loc = this->location(); | |
10042 | ||
10043 | Expression* fn = Expression::make_func_reference(*pno, NULL, loc); | |
10044 | Expression* a = Expression::make_integer_ul(arg, NULL, loc); | |
10045 | Expression_list *args = new Expression_list(); | |
10046 | args->push_back(a); | |
10047 | Expression* call = Expression::make_call(fn, args, false, loc); | |
10048 | ||
10049 | // The builtin functions return void*, but the Go functions return uintptr. | |
10050 | Type* uintptr_type = Type::lookup_integer_type("uintptr"); | |
10051 | return Expression::make_cast(uintptr_type, call, loc); | |
10052 | } | |
10053 | ||
2c809f8f | 10054 | // Flatten a call with multiple results into a temporary. |
10055 | ||
10056 | Expression* | |
b8e86a51 | 10057 | Call_expression::do_flatten(Gogo* gogo, Named_object*, |
10058 | Statement_inserter* inserter) | |
2c809f8f | 10059 | { |
5bf8be8b | 10060 | if (this->is_erroneous_call()) |
10061 | { | |
10062 | go_assert(saw_errors()); | |
10063 | return Expression::make_error(this->location()); | |
10064 | } | |
b8e86a51 | 10065 | |
91c0fd76 | 10066 | if (this->is_flattened_) |
10067 | return this; | |
10068 | this->is_flattened_ = true; | |
10069 | ||
b8e86a51 | 10070 | // Add temporary variables for all arguments that require type |
10071 | // conversion. | |
10072 | Function_type* fntype = this->get_function_type(); | |
9782d556 | 10073 | if (fntype == NULL) |
10074 | { | |
10075 | go_assert(saw_errors()); | |
10076 | return this; | |
10077 | } | |
b8e86a51 | 10078 | if (this->args_ != NULL && !this->args_->empty() |
10079 | && fntype->parameters() != NULL && !fntype->parameters()->empty()) | |
10080 | { | |
10081 | bool is_interface_method = | |
10082 | this->fn_->interface_field_reference_expression() != NULL; | |
10083 | ||
10084 | Expression_list *args = new Expression_list(); | |
10085 | Typed_identifier_list::const_iterator pp = fntype->parameters()->begin(); | |
10086 | Expression_list::const_iterator pa = this->args_->begin(); | |
10087 | if (!is_interface_method && fntype->is_method()) | |
10088 | { | |
10089 | // The receiver argument. | |
10090 | args->push_back(*pa); | |
10091 | ++pa; | |
10092 | } | |
10093 | for (; pa != this->args_->end(); ++pa, ++pp) | |
10094 | { | |
10095 | go_assert(pp != fntype->parameters()->end()); | |
3a522dcc | 10096 | if (Type::are_identical(pp->type(), (*pa)->type(), |
10097 | Type::COMPARE_TAGS, NULL)) | |
b8e86a51 | 10098 | args->push_back(*pa); |
10099 | else | |
10100 | { | |
10101 | Location loc = (*pa)->location(); | |
8ba8cc87 | 10102 | Expression* arg = *pa; |
10103 | if (!arg->is_variable()) | |
10104 | { | |
10105 | Temporary_statement *temp = | |
10106 | Statement::make_temporary(NULL, arg, loc); | |
10107 | inserter->insert(temp); | |
10108 | arg = Expression::make_temporary_reference(temp, loc); | |
10109 | } | |
10110 | arg = Expression::convert_for_assignment(gogo, pp->type(), arg, | |
10111 | loc); | |
10112 | args->push_back(arg); | |
b8e86a51 | 10113 | } |
10114 | } | |
10115 | delete this->args_; | |
10116 | this->args_ = args; | |
10117 | } | |
10118 | ||
2c809f8f | 10119 | return this; |
10120 | } | |
10121 | ||
ceeb4318 | 10122 | // Get the function type. This can return NULL in error cases. |
e440a328 | 10123 | |
10124 | Function_type* | |
10125 | Call_expression::get_function_type() const | |
10126 | { | |
10127 | return this->fn_->type()->function_type(); | |
10128 | } | |
10129 | ||
10130 | // Return the number of values which this call will return. | |
10131 | ||
10132 | size_t | |
10133 | Call_expression::result_count() const | |
10134 | { | |
10135 | const Function_type* fntype = this->get_function_type(); | |
10136 | if (fntype == NULL) | |
10137 | return 0; | |
10138 | if (fntype->results() == NULL) | |
10139 | return 0; | |
10140 | return fntype->results()->size(); | |
10141 | } | |
10142 | ||
5731103c | 10143 | // Return the temporary that holds the result for a call with multiple |
10144 | // results. | |
ceeb4318 | 10145 | |
10146 | Temporary_statement* | |
5731103c | 10147 | Call_expression::results() const |
ceeb4318 | 10148 | { |
5731103c | 10149 | if (this->call_temp_ == NULL) |
cd238b8d | 10150 | { |
10151 | go_assert(saw_errors()); | |
10152 | return NULL; | |
10153 | } | |
5731103c | 10154 | return this->call_temp_; |
ceeb4318 | 10155 | } |
10156 | ||
1373401e | 10157 | // Set the number of results expected from a call expression. |
10158 | ||
10159 | void | |
10160 | Call_expression::set_expected_result_count(size_t count) | |
10161 | { | |
10162 | go_assert(this->expected_result_count_ == 0); | |
10163 | this->expected_result_count_ = count; | |
10164 | } | |
10165 | ||
e440a328 | 10166 | // Return whether this is a call to the predeclared function recover. |
10167 | ||
10168 | bool | |
10169 | Call_expression::is_recover_call() const | |
10170 | { | |
10171 | return this->do_is_recover_call(); | |
10172 | } | |
10173 | ||
10174 | // Set the argument to the recover function. | |
10175 | ||
10176 | void | |
10177 | Call_expression::set_recover_arg(Expression* arg) | |
10178 | { | |
10179 | this->do_set_recover_arg(arg); | |
10180 | } | |
10181 | ||
10182 | // Virtual functions also implemented by Builtin_call_expression. | |
10183 | ||
10184 | bool | |
10185 | Call_expression::do_is_recover_call() const | |
10186 | { | |
10187 | return false; | |
10188 | } | |
10189 | ||
10190 | void | |
10191 | Call_expression::do_set_recover_arg(Expression*) | |
10192 | { | |
c3e6f413 | 10193 | go_unreachable(); |
e440a328 | 10194 | } |
10195 | ||
ceeb4318 | 10196 | // We have found an error with this call expression; return true if |
10197 | // we should report it. | |
10198 | ||
10199 | bool | |
10200 | Call_expression::issue_error() | |
10201 | { | |
10202 | if (this->issued_error_) | |
10203 | return false; | |
10204 | else | |
10205 | { | |
10206 | this->issued_error_ = true; | |
10207 | return true; | |
10208 | } | |
10209 | } | |
10210 | ||
5bf8be8b | 10211 | // Whether or not this call contains errors, either in the call or the |
10212 | // arguments to the call. | |
10213 | ||
10214 | bool | |
10215 | Call_expression::is_erroneous_call() | |
10216 | { | |
10217 | if (this->is_error_expression() || this->fn()->is_error_expression()) | |
10218 | return true; | |
10219 | ||
10220 | if (this->args() == NULL) | |
10221 | return false; | |
10222 | for (Expression_list::iterator pa = this->args()->begin(); | |
10223 | pa != this->args()->end(); | |
10224 | ++pa) | |
10225 | { | |
10226 | if ((*pa)->type()->is_error_type() || (*pa)->is_error_expression()) | |
10227 | return true; | |
10228 | } | |
10229 | return false; | |
10230 | } | |
10231 | ||
e440a328 | 10232 | // Get the type. |
10233 | ||
10234 | Type* | |
10235 | Call_expression::do_type() | |
10236 | { | |
10237 | if (this->type_ != NULL) | |
10238 | return this->type_; | |
10239 | ||
10240 | Type* ret; | |
10241 | Function_type* fntype = this->get_function_type(); | |
10242 | if (fntype == NULL) | |
10243 | return Type::make_error_type(); | |
10244 | ||
10245 | const Typed_identifier_list* results = fntype->results(); | |
10246 | if (results == NULL) | |
10247 | ret = Type::make_void_type(); | |
10248 | else if (results->size() == 1) | |
10249 | ret = results->begin()->type(); | |
10250 | else | |
2801343b | 10251 | ret = Type::make_call_multiple_result_type(this); |
e440a328 | 10252 | |
10253 | this->type_ = ret; | |
10254 | ||
10255 | return this->type_; | |
10256 | } | |
10257 | ||
10258 | // Determine types for a call expression. We can use the function | |
10259 | // parameter types to set the types of the arguments. | |
10260 | ||
10261 | void | |
10262 | Call_expression::do_determine_type(const Type_context*) | |
10263 | { | |
fb94b0ca | 10264 | if (!this->determining_types()) |
10265 | return; | |
10266 | ||
e440a328 | 10267 | this->fn_->determine_type_no_context(); |
10268 | Function_type* fntype = this->get_function_type(); | |
10269 | const Typed_identifier_list* parameters = NULL; | |
10270 | if (fntype != NULL) | |
10271 | parameters = fntype->parameters(); | |
10272 | if (this->args_ != NULL) | |
10273 | { | |
10274 | Typed_identifier_list::const_iterator pt; | |
10275 | if (parameters != NULL) | |
10276 | pt = parameters->begin(); | |
09ea332d | 10277 | bool first = true; |
e440a328 | 10278 | for (Expression_list::const_iterator pa = this->args_->begin(); |
10279 | pa != this->args_->end(); | |
10280 | ++pa) | |
10281 | { | |
09ea332d | 10282 | if (first) |
10283 | { | |
10284 | first = false; | |
10285 | // If this is a method, the first argument is the | |
10286 | // receiver. | |
10287 | if (fntype != NULL && fntype->is_method()) | |
10288 | { | |
10289 | Type* rtype = fntype->receiver()->type(); | |
10290 | // The receiver is always passed as a pointer. | |
10291 | if (rtype->points_to() == NULL) | |
10292 | rtype = Type::make_pointer_type(rtype); | |
10293 | Type_context subcontext(rtype, false); | |
10294 | (*pa)->determine_type(&subcontext); | |
10295 | continue; | |
10296 | } | |
10297 | } | |
10298 | ||
e440a328 | 10299 | if (parameters != NULL && pt != parameters->end()) |
10300 | { | |
10301 | Type_context subcontext(pt->type(), false); | |
10302 | (*pa)->determine_type(&subcontext); | |
10303 | ++pt; | |
10304 | } | |
10305 | else | |
10306 | (*pa)->determine_type_no_context(); | |
10307 | } | |
10308 | } | |
10309 | } | |
10310 | ||
fb94b0ca | 10311 | // Called when determining types for a Call_expression. Return true |
10312 | // if we should go ahead, false if they have already been determined. | |
10313 | ||
10314 | bool | |
10315 | Call_expression::determining_types() | |
10316 | { | |
10317 | if (this->types_are_determined_) | |
10318 | return false; | |
10319 | else | |
10320 | { | |
10321 | this->types_are_determined_ = true; | |
10322 | return true; | |
10323 | } | |
10324 | } | |
10325 | ||
e440a328 | 10326 | // Check types for parameter I. |
10327 | ||
10328 | bool | |
10329 | Call_expression::check_argument_type(int i, const Type* parameter_type, | |
10330 | const Type* argument_type, | |
b13c66cd | 10331 | Location argument_location, |
e440a328 | 10332 | bool issued_error) |
10333 | { | |
10334 | std::string reason; | |
1eae365b | 10335 | if (!Type::are_assignable(parameter_type, argument_type, &reason)) |
e440a328 | 10336 | { |
10337 | if (!issued_error) | |
10338 | { | |
10339 | if (reason.empty()) | |
631d5788 | 10340 | go_error_at(argument_location, "argument %d has incompatible type", i); |
e440a328 | 10341 | else |
631d5788 | 10342 | go_error_at(argument_location, |
10343 | "argument %d has incompatible type (%s)", | |
10344 | i, reason.c_str()); | |
e440a328 | 10345 | } |
10346 | this->set_is_error(); | |
10347 | return false; | |
10348 | } | |
10349 | return true; | |
10350 | } | |
10351 | ||
10352 | // Check types. | |
10353 | ||
10354 | void | |
10355 | Call_expression::do_check_types(Gogo*) | |
10356 | { | |
a6645f74 | 10357 | if (this->classification() == EXPRESSION_ERROR) |
10358 | return; | |
10359 | ||
e440a328 | 10360 | Function_type* fntype = this->get_function_type(); |
10361 | if (fntype == NULL) | |
10362 | { | |
5c13bd80 | 10363 | if (!this->fn_->type()->is_error()) |
e440a328 | 10364 | this->report_error(_("expected function")); |
10365 | return; | |
10366 | } | |
10367 | ||
1373401e | 10368 | if (this->expected_result_count_ != 0 |
10369 | && this->expected_result_count_ != this->result_count()) | |
10370 | { | |
10371 | if (this->issue_error()) | |
10372 | this->report_error(_("function result count mismatch")); | |
10373 | this->set_is_error(); | |
10374 | return; | |
10375 | } | |
10376 | ||
09ea332d | 10377 | bool is_method = fntype->is_method(); |
10378 | if (is_method) | |
e440a328 | 10379 | { |
09ea332d | 10380 | go_assert(this->args_ != NULL && !this->args_->empty()); |
10381 | Type* rtype = fntype->receiver()->type(); | |
10382 | Expression* first_arg = this->args_->front(); | |
1eae365b | 10383 | // We dereference the values since receivers are always passed |
10384 | // as pointers. | |
09ea332d | 10385 | std::string reason; |
1eae365b | 10386 | if (!Type::are_assignable(rtype->deref(), first_arg->type()->deref(), |
10387 | &reason)) | |
e440a328 | 10388 | { |
09ea332d | 10389 | if (reason.empty()) |
10390 | this->report_error(_("incompatible type for receiver")); | |
10391 | else | |
e440a328 | 10392 | { |
631d5788 | 10393 | go_error_at(this->location(), |
10394 | "incompatible type for receiver (%s)", | |
10395 | reason.c_str()); | |
09ea332d | 10396 | this->set_is_error(); |
e440a328 | 10397 | } |
10398 | } | |
10399 | } | |
10400 | ||
10401 | // Note that varargs was handled by the lower_varargs() method, so | |
a6645f74 | 10402 | // we don't have to worry about it here unless something is wrong. |
10403 | if (this->is_varargs_ && !this->varargs_are_lowered_) | |
10404 | { | |
10405 | if (!fntype->is_varargs()) | |
10406 | { | |
631d5788 | 10407 | go_error_at(this->location(), |
10408 | _("invalid use of %<...%> calling non-variadic function")); | |
a6645f74 | 10409 | this->set_is_error(); |
10410 | return; | |
10411 | } | |
10412 | } | |
e440a328 | 10413 | |
10414 | const Typed_identifier_list* parameters = fntype->parameters(); | |
33d1d391 | 10415 | if (this->args_ == NULL || this->args_->size() == 0) |
e440a328 | 10416 | { |
10417 | if (parameters != NULL && !parameters->empty()) | |
10418 | this->report_error(_("not enough arguments")); | |
10419 | } | |
10420 | else if (parameters == NULL) | |
09ea332d | 10421 | { |
10422 | if (!is_method || this->args_->size() > 1) | |
10423 | this->report_error(_("too many arguments")); | |
10424 | } | |
1373401e | 10425 | else if (this->args_->size() == 1 |
10426 | && this->args_->front()->call_expression() != NULL | |
10427 | && this->args_->front()->call_expression()->result_count() > 1) | |
10428 | { | |
10429 | // This is F(G()) when G returns more than one result. If the | |
10430 | // results can be matched to parameters, it would have been | |
10431 | // lowered in do_lower. If we get here we know there is a | |
10432 | // mismatch. | |
10433 | if (this->args_->front()->call_expression()->result_count() | |
10434 | < parameters->size()) | |
10435 | this->report_error(_("not enough arguments")); | |
10436 | else | |
10437 | this->report_error(_("too many arguments")); | |
10438 | } | |
e440a328 | 10439 | else |
10440 | { | |
10441 | int i = 0; | |
09ea332d | 10442 | Expression_list::const_iterator pa = this->args_->begin(); |
10443 | if (is_method) | |
10444 | ++pa; | |
10445 | for (Typed_identifier_list::const_iterator pt = parameters->begin(); | |
10446 | pt != parameters->end(); | |
10447 | ++pt, ++pa, ++i) | |
e440a328 | 10448 | { |
09ea332d | 10449 | if (pa == this->args_->end()) |
e440a328 | 10450 | { |
09ea332d | 10451 | this->report_error(_("not enough arguments")); |
e440a328 | 10452 | return; |
10453 | } | |
10454 | this->check_argument_type(i + 1, pt->type(), (*pa)->type(), | |
10455 | (*pa)->location(), false); | |
10456 | } | |
09ea332d | 10457 | if (pa != this->args_->end()) |
10458 | this->report_error(_("too many arguments")); | |
e440a328 | 10459 | } |
10460 | } | |
10461 | ||
72666aed | 10462 | Expression* |
10463 | Call_expression::do_copy() | |
10464 | { | |
10465 | Call_expression* call = | |
10466 | Expression::make_call(this->fn_->copy(), | |
10467 | (this->args_ == NULL | |
10468 | ? NULL | |
10469 | : this->args_->copy()), | |
10470 | this->is_varargs_, this->location()); | |
10471 | ||
10472 | if (this->varargs_are_lowered_) | |
10473 | call->set_varargs_are_lowered(); | |
28819633 | 10474 | if (this->is_deferred_) |
10475 | call->set_is_deferred(); | |
10476 | if (this->is_concurrent_) | |
10477 | call->set_is_concurrent(); | |
72666aed | 10478 | return call; |
10479 | } | |
10480 | ||
e440a328 | 10481 | // Return whether we have to use a temporary variable to ensure that |
10482 | // we evaluate this call expression in order. If the call returns no | |
ceeb4318 | 10483 | // results then it will inevitably be executed last. |
e440a328 | 10484 | |
10485 | bool | |
10486 | Call_expression::do_must_eval_in_order() const | |
10487 | { | |
ceeb4318 | 10488 | return this->result_count() > 0; |
e440a328 | 10489 | } |
10490 | ||
e440a328 | 10491 | // Get the function and the first argument to use when calling an |
10492 | // interface method. | |
10493 | ||
2387f644 | 10494 | Expression* |
e440a328 | 10495 | Call_expression::interface_method_function( |
e440a328 | 10496 | Interface_field_reference_expression* interface_method, |
db122cb9 | 10497 | Expression** first_arg_ptr, |
10498 | Location location) | |
e440a328 | 10499 | { |
db122cb9 | 10500 | Expression* object = interface_method->get_underlying_object(); |
10501 | Type* unsafe_ptr_type = Type::make_pointer_type(Type::make_void_type()); | |
10502 | *first_arg_ptr = | |
10503 | Expression::make_unsafe_cast(unsafe_ptr_type, object, location); | |
2387f644 | 10504 | return interface_method->get_function(); |
e440a328 | 10505 | } |
10506 | ||
10507 | // Build the call expression. | |
10508 | ||
ea664253 | 10509 | Bexpression* |
10510 | Call_expression::do_get_backend(Translate_context* context) | |
e440a328 | 10511 | { |
5731103c | 10512 | Location location = this->location(); |
10513 | ||
2c809f8f | 10514 | if (this->call_ != NULL) |
5731103c | 10515 | { |
10516 | // If the call returns multiple results, make a new reference to | |
10517 | // the temporary. | |
10518 | if (this->call_temp_ != NULL) | |
10519 | { | |
10520 | Expression* ref = | |
10521 | Expression::make_temporary_reference(this->call_temp_, location); | |
10522 | return ref->get_backend(context); | |
10523 | } | |
10524 | ||
10525 | return this->call_; | |
10526 | } | |
e440a328 | 10527 | |
10528 | Function_type* fntype = this->get_function_type(); | |
10529 | if (fntype == NULL) | |
ea664253 | 10530 | return context->backend()->error_expression(); |
e440a328 | 10531 | |
10532 | if (this->fn_->is_error_expression()) | |
ea664253 | 10533 | return context->backend()->error_expression(); |
e440a328 | 10534 | |
10535 | Gogo* gogo = context->gogo(); | |
e440a328 | 10536 | |
10537 | Func_expression* func = this->fn_->func_expression(); | |
e440a328 | 10538 | Interface_field_reference_expression* interface_method = |
10539 | this->fn_->interface_field_reference_expression(); | |
10540 | const bool has_closure = func != NULL && func->closure() != NULL; | |
09ea332d | 10541 | const bool is_interface_method = interface_method != NULL; |
e440a328 | 10542 | |
f8bdf81a | 10543 | bool has_closure_arg; |
8381eda7 | 10544 | if (has_closure) |
f8bdf81a | 10545 | has_closure_arg = true; |
8381eda7 | 10546 | else if (func != NULL) |
f8bdf81a | 10547 | has_closure_arg = false; |
8381eda7 | 10548 | else if (is_interface_method) |
f8bdf81a | 10549 | has_closure_arg = false; |
8381eda7 | 10550 | else |
f8bdf81a | 10551 | has_closure_arg = true; |
8381eda7 | 10552 | |
e440a328 | 10553 | int nargs; |
2c809f8f | 10554 | std::vector<Bexpression*> fn_args; |
e440a328 | 10555 | if (this->args_ == NULL || this->args_->empty()) |
10556 | { | |
f8bdf81a | 10557 | nargs = is_interface_method ? 1 : 0; |
2c809f8f | 10558 | if (nargs > 0) |
10559 | fn_args.resize(1); | |
e440a328 | 10560 | } |
09ea332d | 10561 | else if (fntype->parameters() == NULL || fntype->parameters()->empty()) |
10562 | { | |
10563 | // Passing a receiver parameter. | |
10564 | go_assert(!is_interface_method | |
10565 | && fntype->is_method() | |
10566 | && this->args_->size() == 1); | |
f8bdf81a | 10567 | nargs = 1; |
2c809f8f | 10568 | fn_args.resize(1); |
ea664253 | 10569 | fn_args[0] = this->args_->front()->get_backend(context); |
09ea332d | 10570 | } |
e440a328 | 10571 | else |
10572 | { | |
10573 | const Typed_identifier_list* params = fntype->parameters(); | |
e440a328 | 10574 | |
10575 | nargs = this->args_->size(); | |
09ea332d | 10576 | int i = is_interface_method ? 1 : 0; |
e440a328 | 10577 | nargs += i; |
2c809f8f | 10578 | fn_args.resize(nargs); |
e440a328 | 10579 | |
10580 | Typed_identifier_list::const_iterator pp = params->begin(); | |
09ea332d | 10581 | Expression_list::const_iterator pe = this->args_->begin(); |
10582 | if (!is_interface_method && fntype->is_method()) | |
10583 | { | |
ea664253 | 10584 | fn_args[i] = (*pe)->get_backend(context); |
09ea332d | 10585 | ++pe; |
10586 | ++i; | |
10587 | } | |
10588 | for (; pe != this->args_->end(); ++pe, ++pp, ++i) | |
e440a328 | 10589 | { |
c484d925 | 10590 | go_assert(pp != params->end()); |
2c809f8f | 10591 | Expression* arg = |
10592 | Expression::convert_for_assignment(gogo, pp->type(), *pe, | |
10593 | location); | |
ea664253 | 10594 | fn_args[i] = arg->get_backend(context); |
e440a328 | 10595 | } |
c484d925 | 10596 | go_assert(pp == params->end()); |
f8bdf81a | 10597 | go_assert(i == nargs); |
e440a328 | 10598 | } |
10599 | ||
2c809f8f | 10600 | Expression* fn; |
10601 | Expression* closure = NULL; | |
8381eda7 | 10602 | if (func != NULL) |
10603 | { | |
10604 | Named_object* no = func->named_object(); | |
2c809f8f | 10605 | fn = Expression::make_func_code_reference(no, location); |
10606 | if (has_closure) | |
10607 | closure = func->closure(); | |
8381eda7 | 10608 | } |
09ea332d | 10609 | else if (!is_interface_method) |
8381eda7 | 10610 | { |
2c809f8f | 10611 | closure = this->fn_; |
10612 | ||
10613 | // The backend representation of this function type is a pointer | |
10614 | // to a struct whose first field is the actual function to call. | |
10615 | Type* pfntype = | |
10616 | Type::make_pointer_type( | |
10617 | Type::make_pointer_type(Type::make_void_type())); | |
10618 | fn = Expression::make_unsafe_cast(pfntype, this->fn_, location); | |
f614ea8b | 10619 | fn = Expression::make_dereference(fn, NIL_CHECK_NOT_NEEDED, location); |
2c809f8f | 10620 | } |
e440a328 | 10621 | else |
cf609de4 | 10622 | { |
2387f644 | 10623 | Expression* first_arg; |
db122cb9 | 10624 | fn = this->interface_method_function(interface_method, &first_arg, |
10625 | location); | |
ea664253 | 10626 | fn_args[0] = first_arg->get_backend(context); |
e440a328 | 10627 | } |
10628 | ||
1ecc6157 | 10629 | Bexpression* bclosure = NULL; |
10630 | if (has_closure_arg) | |
10631 | bclosure = closure->get_backend(context); | |
f8bdf81a | 10632 | else |
1ecc6157 | 10633 | go_assert(closure == NULL); |
f8bdf81a | 10634 | |
ea664253 | 10635 | Bexpression* bfn = fn->get_backend(context); |
80d1e1a8 | 10636 | |
10637 | // When not calling a named function directly, use a type conversion | |
10638 | // in case the type of the function is a recursive type which refers | |
10639 | // to itself. We don't do this for an interface method because 1) | |
10640 | // an interface method never refers to itself, so we always have a | |
10641 | // function type here; 2) we pass an extra first argument to an | |
10642 | // interface method, so fntype is not correct. | |
10643 | if (func == NULL && !is_interface_method) | |
10644 | { | |
10645 | Btype* bft = fntype->get_backend_fntype(gogo); | |
10646 | bfn = gogo->backend()->convert_expression(bft, bfn, location); | |
10647 | } | |
10648 | ||
4ced7af9 | 10649 | Bfunction* bfunction = NULL; |
10650 | if (context->function()) | |
10651 | bfunction = context->function()->func_value()->get_decl(); | |
10652 | Bexpression* call = gogo->backend()->call_expression(bfunction, bfn, | |
10653 | fn_args, bclosure, | |
10654 | location); | |
e440a328 | 10655 | |
5731103c | 10656 | if (this->call_temp_ != NULL) |
e440a328 | 10657 | { |
5731103c | 10658 | // This case occurs when the call returns multiple results. |
e440a328 | 10659 | |
5731103c | 10660 | Expression* ref = Expression::make_temporary_reference(this->call_temp_, |
10661 | location); | |
10662 | Bexpression* bref = ref->get_backend(context); | |
10663 | Bstatement* bassn = gogo->backend()->assignment_statement(bfunction, | |
10664 | bref, call, | |
10665 | location); | |
e440a328 | 10666 | |
5731103c | 10667 | ref = Expression::make_temporary_reference(this->call_temp_, location); |
10668 | this->call_ = ref->get_backend(context); | |
10669 | ||
10670 | return gogo->backend()->compound_expression(bassn, this->call_, | |
10671 | location); | |
2c809f8f | 10672 | } |
e440a328 | 10673 | |
2c809f8f | 10674 | this->call_ = call; |
ea664253 | 10675 | return this->call_; |
e440a328 | 10676 | } |
10677 | ||
d751bb78 | 10678 | // Dump ast representation for a call expressin. |
10679 | ||
10680 | void | |
10681 | Call_expression::do_dump_expression(Ast_dump_context* ast_dump_context) const | |
10682 | { | |
10683 | this->fn_->dump_expression(ast_dump_context); | |
10684 | ast_dump_context->ostream() << "("; | |
10685 | if (args_ != NULL) | |
10686 | ast_dump_context->dump_expression_list(this->args_); | |
10687 | ||
10688 | ast_dump_context->ostream() << ") "; | |
10689 | } | |
10690 | ||
e440a328 | 10691 | // Make a call expression. |
10692 | ||
10693 | Call_expression* | |
10694 | Expression::make_call(Expression* fn, Expression_list* args, bool is_varargs, | |
b13c66cd | 10695 | Location location) |
e440a328 | 10696 | { |
10697 | return new Call_expression(fn, args, is_varargs, location); | |
10698 | } | |
10699 | ||
da244e59 | 10700 | // Class Call_result_expression. |
e440a328 | 10701 | |
10702 | // Traverse a call result. | |
10703 | ||
10704 | int | |
10705 | Call_result_expression::do_traverse(Traverse* traverse) | |
10706 | { | |
10707 | if (traverse->remember_expression(this->call_)) | |
10708 | { | |
10709 | // We have already traversed the call expression. | |
10710 | return TRAVERSE_CONTINUE; | |
10711 | } | |
10712 | return Expression::traverse(&this->call_, traverse); | |
10713 | } | |
10714 | ||
10715 | // Get the type. | |
10716 | ||
10717 | Type* | |
10718 | Call_result_expression::do_type() | |
10719 | { | |
425dd051 | 10720 | if (this->classification() == EXPRESSION_ERROR) |
10721 | return Type::make_error_type(); | |
10722 | ||
e440a328 | 10723 | // THIS->CALL_ can be replaced with a temporary reference due to |
10724 | // Call_expression::do_must_eval_in_order when there is an error. | |
10725 | Call_expression* ce = this->call_->call_expression(); | |
10726 | if (ce == NULL) | |
5e85f268 | 10727 | { |
10728 | this->set_is_error(); | |
10729 | return Type::make_error_type(); | |
10730 | } | |
e440a328 | 10731 | Function_type* fntype = ce->get_function_type(); |
10732 | if (fntype == NULL) | |
5e85f268 | 10733 | { |
e37658e2 | 10734 | if (ce->issue_error()) |
99b3f06f | 10735 | { |
10736 | if (!ce->fn()->type()->is_error()) | |
10737 | this->report_error(_("expected function")); | |
10738 | } | |
5e85f268 | 10739 | this->set_is_error(); |
10740 | return Type::make_error_type(); | |
10741 | } | |
e440a328 | 10742 | const Typed_identifier_list* results = fntype->results(); |
ceeb4318 | 10743 | if (results == NULL || results->size() < 2) |
7b8d861f | 10744 | { |
ceeb4318 | 10745 | if (ce->issue_error()) |
10746 | this->report_error(_("number of results does not match " | |
10747 | "number of values")); | |
7b8d861f | 10748 | return Type::make_error_type(); |
10749 | } | |
e440a328 | 10750 | Typed_identifier_list::const_iterator pr = results->begin(); |
10751 | for (unsigned int i = 0; i < this->index_; ++i) | |
10752 | { | |
10753 | if (pr == results->end()) | |
425dd051 | 10754 | break; |
e440a328 | 10755 | ++pr; |
10756 | } | |
10757 | if (pr == results->end()) | |
425dd051 | 10758 | { |
ceeb4318 | 10759 | if (ce->issue_error()) |
10760 | this->report_error(_("number of results does not match " | |
10761 | "number of values")); | |
425dd051 | 10762 | return Type::make_error_type(); |
10763 | } | |
e440a328 | 10764 | return pr->type(); |
10765 | } | |
10766 | ||
425dd051 | 10767 | // Check the type. Just make sure that we trigger the warning in |
10768 | // do_type. | |
e440a328 | 10769 | |
10770 | void | |
10771 | Call_result_expression::do_check_types(Gogo*) | |
10772 | { | |
425dd051 | 10773 | this->type(); |
e440a328 | 10774 | } |
10775 | ||
10776 | // Determine the type. We have nothing to do here, but the 0 result | |
10777 | // needs to pass down to the caller. | |
10778 | ||
10779 | void | |
10780 | Call_result_expression::do_determine_type(const Type_context*) | |
10781 | { | |
fb94b0ca | 10782 | this->call_->determine_type_no_context(); |
e440a328 | 10783 | } |
10784 | ||
ea664253 | 10785 | // Return the backend representation. We just refer to the temporary set by the |
10786 | // call expression. We don't do this at lowering time because it makes it | |
ceeb4318 | 10787 | // hard to evaluate the call at the right time. |
e440a328 | 10788 | |
ea664253 | 10789 | Bexpression* |
10790 | Call_result_expression::do_get_backend(Translate_context* context) | |
e440a328 | 10791 | { |
ceeb4318 | 10792 | Call_expression* ce = this->call_->call_expression(); |
cd238b8d | 10793 | if (ce == NULL) |
10794 | { | |
10795 | go_assert(this->call_->is_error_expression()); | |
ea664253 | 10796 | return context->backend()->error_expression(); |
cd238b8d | 10797 | } |
5731103c | 10798 | Temporary_statement* ts = ce->results(); |
cd238b8d | 10799 | if (ts == NULL) |
10800 | { | |
10801 | go_assert(saw_errors()); | |
ea664253 | 10802 | return context->backend()->error_expression(); |
cd238b8d | 10803 | } |
ceeb4318 | 10804 | Expression* ref = Expression::make_temporary_reference(ts, this->location()); |
5731103c | 10805 | ref = Expression::make_field_reference(ref, this->index_, this->location()); |
ea664253 | 10806 | return ref->get_backend(context); |
e440a328 | 10807 | } |
10808 | ||
d751bb78 | 10809 | // Dump ast representation for a call result expression. |
10810 | ||
10811 | void | |
10812 | Call_result_expression::do_dump_expression(Ast_dump_context* ast_dump_context) | |
10813 | const | |
10814 | { | |
10815 | // FIXME: Wouldn't it be better if the call is assigned to a temporary | |
10816 | // (struct) and the fields are referenced instead. | |
10817 | ast_dump_context->ostream() << this->index_ << "@("; | |
10818 | ast_dump_context->dump_expression(this->call_); | |
10819 | ast_dump_context->ostream() << ")"; | |
10820 | } | |
10821 | ||
e440a328 | 10822 | // Make a reference to a single result of a call which returns |
10823 | // multiple results. | |
10824 | ||
10825 | Expression* | |
10826 | Expression::make_call_result(Call_expression* call, unsigned int index) | |
10827 | { | |
10828 | return new Call_result_expression(call, index); | |
10829 | } | |
10830 | ||
10831 | // Class Index_expression. | |
10832 | ||
10833 | // Traversal. | |
10834 | ||
10835 | int | |
10836 | Index_expression::do_traverse(Traverse* traverse) | |
10837 | { | |
10838 | if (Expression::traverse(&this->left_, traverse) == TRAVERSE_EXIT | |
10839 | || Expression::traverse(&this->start_, traverse) == TRAVERSE_EXIT | |
10840 | || (this->end_ != NULL | |
acf2b673 | 10841 | && Expression::traverse(&this->end_, traverse) == TRAVERSE_EXIT) |
10842 | || (this->cap_ != NULL | |
10843 | && Expression::traverse(&this->cap_, traverse) == TRAVERSE_EXIT)) | |
e440a328 | 10844 | return TRAVERSE_EXIT; |
10845 | return TRAVERSE_CONTINUE; | |
10846 | } | |
10847 | ||
10848 | // Lower an index expression. This converts the generic index | |
10849 | // expression into an array index, a string index, or a map index. | |
10850 | ||
10851 | Expression* | |
ceeb4318 | 10852 | Index_expression::do_lower(Gogo*, Named_object*, Statement_inserter*, int) |
e440a328 | 10853 | { |
b13c66cd | 10854 | Location location = this->location(); |
e440a328 | 10855 | Expression* left = this->left_; |
10856 | Expression* start = this->start_; | |
10857 | Expression* end = this->end_; | |
acf2b673 | 10858 | Expression* cap = this->cap_; |
e440a328 | 10859 | |
10860 | Type* type = left->type(); | |
5c13bd80 | 10861 | if (type->is_error()) |
d9f3743a | 10862 | { |
10863 | go_assert(saw_errors()); | |
10864 | return Expression::make_error(location); | |
10865 | } | |
b0cf7ddd | 10866 | else if (left->is_type_expression()) |
10867 | { | |
631d5788 | 10868 | go_error_at(location, "attempt to index type expression"); |
b0cf7ddd | 10869 | return Expression::make_error(location); |
10870 | } | |
e440a328 | 10871 | else if (type->array_type() != NULL) |
acf2b673 | 10872 | return Expression::make_array_index(left, start, end, cap, location); |
e440a328 | 10873 | else if (type->points_to() != NULL |
10874 | && type->points_to()->array_type() != NULL | |
411eb89e | 10875 | && !type->points_to()->is_slice_type()) |
e440a328 | 10876 | { |
f614ea8b | 10877 | Expression* deref = |
10878 | Expression::make_dereference(left, NIL_CHECK_DEFAULT, location); | |
38092374 | 10879 | |
10880 | // For an ordinary index into the array, the pointer will be | |
10881 | // dereferenced. For a slice it will not--the resulting slice | |
10882 | // will simply reuse the pointer, which is incorrect if that | |
10883 | // pointer is nil. | |
10884 | if (end != NULL || cap != NULL) | |
10885 | deref->issue_nil_check(); | |
10886 | ||
acf2b673 | 10887 | return Expression::make_array_index(deref, start, end, cap, location); |
e440a328 | 10888 | } |
10889 | else if (type->is_string_type()) | |
acf2b673 | 10890 | { |
10891 | if (cap != NULL) | |
10892 | { | |
631d5788 | 10893 | go_error_at(location, "invalid 3-index slice of string"); |
acf2b673 | 10894 | return Expression::make_error(location); |
10895 | } | |
10896 | return Expression::make_string_index(left, start, end, location); | |
10897 | } | |
e440a328 | 10898 | else if (type->map_type() != NULL) |
10899 | { | |
acf2b673 | 10900 | if (end != NULL || cap != NULL) |
e440a328 | 10901 | { |
631d5788 | 10902 | go_error_at(location, "invalid slice of map"); |
e440a328 | 10903 | return Expression::make_error(location); |
10904 | } | |
0d5530d9 | 10905 | return Expression::make_map_index(left, start, location); |
e440a328 | 10906 | } |
b1aba207 | 10907 | else if (cap != NULL) |
10908 | { | |
10909 | go_error_at(location, | |
10910 | "invalid 3-index slice of object that is not a slice"); | |
10911 | return Expression::make_error(location); | |
10912 | } | |
10913 | else if (end != NULL) | |
10914 | { | |
10915 | go_error_at(location, | |
10916 | ("attempt to slice object that is not " | |
10917 | "array, slice, or string")); | |
10918 | return Expression::make_error(location); | |
10919 | } | |
e440a328 | 10920 | else |
10921 | { | |
631d5788 | 10922 | go_error_at(location, |
b1aba207 | 10923 | ("attempt to index object that is not " |
10924 | "array, slice, string, or map")); | |
e440a328 | 10925 | return Expression::make_error(location); |
10926 | } | |
10927 | } | |
10928 | ||
acf2b673 | 10929 | // Write an indexed expression |
10930 | // (expr[expr:expr:expr], expr[expr:expr] or expr[expr]) to a dump context. | |
d751bb78 | 10931 | |
10932 | void | |
10933 | Index_expression::dump_index_expression(Ast_dump_context* ast_dump_context, | |
10934 | const Expression* expr, | |
10935 | const Expression* start, | |
acf2b673 | 10936 | const Expression* end, |
10937 | const Expression* cap) | |
d751bb78 | 10938 | { |
10939 | expr->dump_expression(ast_dump_context); | |
10940 | ast_dump_context->ostream() << "["; | |
10941 | start->dump_expression(ast_dump_context); | |
10942 | if (end != NULL) | |
10943 | { | |
10944 | ast_dump_context->ostream() << ":"; | |
10945 | end->dump_expression(ast_dump_context); | |
10946 | } | |
acf2b673 | 10947 | if (cap != NULL) |
10948 | { | |
10949 | ast_dump_context->ostream() << ":"; | |
10950 | cap->dump_expression(ast_dump_context); | |
10951 | } | |
d751bb78 | 10952 | ast_dump_context->ostream() << "]"; |
10953 | } | |
10954 | ||
10955 | // Dump ast representation for an index expression. | |
10956 | ||
10957 | void | |
10958 | Index_expression::do_dump_expression(Ast_dump_context* ast_dump_context) | |
10959 | const | |
10960 | { | |
10961 | Index_expression::dump_index_expression(ast_dump_context, this->left_, | |
acf2b673 | 10962 | this->start_, this->end_, this->cap_); |
d751bb78 | 10963 | } |
10964 | ||
e440a328 | 10965 | // Make an index expression. |
10966 | ||
10967 | Expression* | |
10968 | Expression::make_index(Expression* left, Expression* start, Expression* end, | |
acf2b673 | 10969 | Expression* cap, Location location) |
e440a328 | 10970 | { |
acf2b673 | 10971 | return new Index_expression(left, start, end, cap, location); |
e440a328 | 10972 | } |
10973 | ||
da244e59 | 10974 | // Class Array_index_expression. |
e440a328 | 10975 | |
10976 | // Array index traversal. | |
10977 | ||
10978 | int | |
10979 | Array_index_expression::do_traverse(Traverse* traverse) | |
10980 | { | |
10981 | if (Expression::traverse(&this->array_, traverse) == TRAVERSE_EXIT) | |
10982 | return TRAVERSE_EXIT; | |
10983 | if (Expression::traverse(&this->start_, traverse) == TRAVERSE_EXIT) | |
10984 | return TRAVERSE_EXIT; | |
10985 | if (this->end_ != NULL) | |
10986 | { | |
10987 | if (Expression::traverse(&this->end_, traverse) == TRAVERSE_EXIT) | |
10988 | return TRAVERSE_EXIT; | |
10989 | } | |
acf2b673 | 10990 | if (this->cap_ != NULL) |
10991 | { | |
10992 | if (Expression::traverse(&this->cap_, traverse) == TRAVERSE_EXIT) | |
10993 | return TRAVERSE_EXIT; | |
10994 | } | |
e440a328 | 10995 | return TRAVERSE_CONTINUE; |
10996 | } | |
10997 | ||
10998 | // Return the type of an array index. | |
10999 | ||
11000 | Type* | |
11001 | Array_index_expression::do_type() | |
11002 | { | |
11003 | if (this->type_ == NULL) | |
11004 | { | |
11005 | Array_type* type = this->array_->type()->array_type(); | |
11006 | if (type == NULL) | |
11007 | this->type_ = Type::make_error_type(); | |
11008 | else if (this->end_ == NULL) | |
11009 | this->type_ = type->element_type(); | |
411eb89e | 11010 | else if (type->is_slice_type()) |
e440a328 | 11011 | { |
11012 | // A slice of a slice has the same type as the original | |
11013 | // slice. | |
11014 | this->type_ = this->array_->type()->deref(); | |
11015 | } | |
11016 | else | |
11017 | { | |
11018 | // A slice of an array is a slice. | |
11019 | this->type_ = Type::make_array_type(type->element_type(), NULL); | |
11020 | } | |
11021 | } | |
11022 | return this->type_; | |
11023 | } | |
11024 | ||
11025 | // Set the type of an array index. | |
11026 | ||
11027 | void | |
11028 | Array_index_expression::do_determine_type(const Type_context*) | |
11029 | { | |
11030 | this->array_->determine_type_no_context(); | |
f77aa642 | 11031 | |
11032 | Type_context index_context(Type::lookup_integer_type("int"), false); | |
11033 | if (this->start_->is_constant()) | |
11034 | this->start_->determine_type(&index_context); | |
11035 | else | |
11036 | this->start_->determine_type_no_context(); | |
e440a328 | 11037 | if (this->end_ != NULL) |
f77aa642 | 11038 | { |
11039 | if (this->end_->is_constant()) | |
11040 | this->end_->determine_type(&index_context); | |
11041 | else | |
11042 | this->end_->determine_type_no_context(); | |
11043 | } | |
acf2b673 | 11044 | if (this->cap_ != NULL) |
f77aa642 | 11045 | { |
11046 | if (this->cap_->is_constant()) | |
11047 | this->cap_->determine_type(&index_context); | |
11048 | else | |
11049 | this->cap_->determine_type_no_context(); | |
11050 | } | |
e440a328 | 11051 | } |
11052 | ||
11053 | // Check types of an array index. | |
11054 | ||
11055 | void | |
b7327dbf | 11056 | Array_index_expression::do_check_types(Gogo*) |
e440a328 | 11057 | { |
f6bc81e6 | 11058 | Numeric_constant nc; |
11059 | unsigned long v; | |
11060 | if (this->start_->type()->integer_type() == NULL | |
11061 | && !this->start_->type()->is_error() | |
11062 | && (!this->start_->numeric_constant_value(&nc) | |
11063 | || nc.to_unsigned_long(&v) == Numeric_constant::NC_UL_NOTINT)) | |
e440a328 | 11064 | this->report_error(_("index must be integer")); |
11065 | if (this->end_ != NULL | |
11066 | && this->end_->type()->integer_type() == NULL | |
99b3f06f | 11067 | && !this->end_->type()->is_error() |
11068 | && !this->end_->is_nil_expression() | |
f6bc81e6 | 11069 | && !this->end_->is_error_expression() |
11070 | && (!this->end_->numeric_constant_value(&nc) | |
11071 | || nc.to_unsigned_long(&v) == Numeric_constant::NC_UL_NOTINT)) | |
e440a328 | 11072 | this->report_error(_("slice end must be integer")); |
acf2b673 | 11073 | if (this->cap_ != NULL |
11074 | && this->cap_->type()->integer_type() == NULL | |
11075 | && !this->cap_->type()->is_error() | |
11076 | && !this->cap_->is_nil_expression() | |
11077 | && !this->cap_->is_error_expression() | |
11078 | && (!this->cap_->numeric_constant_value(&nc) | |
11079 | || nc.to_unsigned_long(&v) == Numeric_constant::NC_UL_NOTINT)) | |
11080 | this->report_error(_("slice capacity must be integer")); | |
e440a328 | 11081 | |
11082 | Array_type* array_type = this->array_->type()->array_type(); | |
f9c68f17 | 11083 | if (array_type == NULL) |
11084 | { | |
c484d925 | 11085 | go_assert(this->array_->type()->is_error()); |
f9c68f17 | 11086 | return; |
11087 | } | |
e440a328 | 11088 | |
11089 | unsigned int int_bits = | |
11090 | Type::lookup_integer_type("int")->integer_type()->bits(); | |
11091 | ||
0c77715b | 11092 | Numeric_constant lvalnc; |
e440a328 | 11093 | mpz_t lval; |
e440a328 | 11094 | bool lval_valid = (array_type->length() != NULL |
0c77715b | 11095 | && array_type->length()->numeric_constant_value(&lvalnc) |
11096 | && lvalnc.to_int(&lval)); | |
11097 | Numeric_constant inc; | |
e440a328 | 11098 | mpz_t ival; |
0bd5d859 | 11099 | bool ival_valid = false; |
0c77715b | 11100 | if (this->start_->numeric_constant_value(&inc) && inc.to_int(&ival)) |
e440a328 | 11101 | { |
0bd5d859 | 11102 | ival_valid = true; |
e440a328 | 11103 | if (mpz_sgn(ival) < 0 |
11104 | || mpz_sizeinbase(ival, 2) >= int_bits | |
11105 | || (lval_valid | |
11106 | && (this->end_ == NULL | |
11107 | ? mpz_cmp(ival, lval) >= 0 | |
11108 | : mpz_cmp(ival, lval) > 0))) | |
11109 | { | |
631d5788 | 11110 | go_error_at(this->start_->location(), "array index out of bounds"); |
e440a328 | 11111 | this->set_is_error(); |
11112 | } | |
11113 | } | |
11114 | if (this->end_ != NULL && !this->end_->is_nil_expression()) | |
11115 | { | |
0c77715b | 11116 | Numeric_constant enc; |
11117 | mpz_t eval; | |
acf2b673 | 11118 | bool eval_valid = false; |
0c77715b | 11119 | if (this->end_->numeric_constant_value(&enc) && enc.to_int(&eval)) |
e440a328 | 11120 | { |
acf2b673 | 11121 | eval_valid = true; |
0c77715b | 11122 | if (mpz_sgn(eval) < 0 |
11123 | || mpz_sizeinbase(eval, 2) >= int_bits | |
11124 | || (lval_valid && mpz_cmp(eval, lval) > 0)) | |
e440a328 | 11125 | { |
631d5788 | 11126 | go_error_at(this->end_->location(), "array index out of bounds"); |
e440a328 | 11127 | this->set_is_error(); |
11128 | } | |
0bd5d859 | 11129 | else if (ival_valid && mpz_cmp(ival, eval) > 0) |
11130 | this->report_error(_("inverted slice range")); | |
e440a328 | 11131 | } |
acf2b673 | 11132 | |
11133 | Numeric_constant cnc; | |
11134 | mpz_t cval; | |
11135 | if (this->cap_ != NULL | |
11136 | && this->cap_->numeric_constant_value(&cnc) && cnc.to_int(&cval)) | |
11137 | { | |
11138 | if (mpz_sgn(cval) < 0 | |
11139 | || mpz_sizeinbase(cval, 2) >= int_bits | |
11140 | || (lval_valid && mpz_cmp(cval, lval) > 0)) | |
11141 | { | |
631d5788 | 11142 | go_error_at(this->cap_->location(), "array index out of bounds"); |
acf2b673 | 11143 | this->set_is_error(); |
11144 | } | |
11145 | else if (ival_valid && mpz_cmp(ival, cval) > 0) | |
11146 | { | |
631d5788 | 11147 | go_error_at(this->cap_->location(), |
11148 | "invalid slice index: capacity less than start"); | |
acf2b673 | 11149 | this->set_is_error(); |
11150 | } | |
11151 | else if (eval_valid && mpz_cmp(eval, cval) > 0) | |
11152 | { | |
631d5788 | 11153 | go_error_at(this->cap_->location(), |
11154 | "invalid slice index: capacity less than length"); | |
acf2b673 | 11155 | this->set_is_error(); |
11156 | } | |
11157 | mpz_clear(cval); | |
11158 | } | |
11159 | ||
11160 | if (eval_valid) | |
11161 | mpz_clear(eval); | |
e440a328 | 11162 | } |
0bd5d859 | 11163 | if (ival_valid) |
11164 | mpz_clear(ival); | |
0c77715b | 11165 | if (lval_valid) |
11166 | mpz_clear(lval); | |
e440a328 | 11167 | |
11168 | // A slice of an array requires an addressable array. A slice of a | |
11169 | // slice is always possible. | |
411eb89e | 11170 | if (this->end_ != NULL && !array_type->is_slice_type()) |
88ec30c8 | 11171 | { |
11172 | if (!this->array_->is_addressable()) | |
8da39c3b | 11173 | this->report_error(_("slice of unaddressable value")); |
88ec30c8 | 11174 | else |
b7327dbf | 11175 | // Set the array address taken but not escape. The escape |
11176 | // analysis will make it escape to heap when needed. | |
11177 | this->array_->address_taken(false); | |
88ec30c8 | 11178 | } |
e440a328 | 11179 | } |
11180 | ||
71a38860 | 11181 | // The subexpressions of an array index must be evaluated in order. |
11182 | // If this is indexing into an array, rather than a slice, then only | |
11183 | // the index should be evaluated. Since this is called for values on | |
11184 | // the left hand side of an assigment, evaluating the array, meaning | |
11185 | // copying the array, will cause a different array to be modified. | |
11186 | ||
11187 | bool | |
11188 | Array_index_expression::do_must_eval_subexpressions_in_order( | |
11189 | int* skip) const | |
11190 | { | |
11191 | *skip = this->array_->type()->is_slice_type() ? 0 : 1; | |
11192 | return true; | |
11193 | } | |
11194 | ||
2c809f8f | 11195 | // Flatten array indexing by using temporary variables for slices and indexes. |
35a54f17 | 11196 | |
11197 | Expression* | |
11198 | Array_index_expression::do_flatten(Gogo*, Named_object*, | |
11199 | Statement_inserter* inserter) | |
11200 | { | |
11201 | Location loc = this->location(); | |
5bf8be8b | 11202 | Expression* array = this->array_; |
11203 | Expression* start = this->start_; | |
11204 | Expression* end = this->end_; | |
11205 | Expression* cap = this->cap_; | |
11206 | if (array->is_error_expression() | |
11207 | || array->type()->is_error_type() | |
11208 | || start->is_error_expression() | |
11209 | || start->type()->is_error_type() | |
11210 | || (end != NULL | |
11211 | && (end->is_error_expression() || end->type()->is_error_type())) | |
11212 | || (cap != NULL | |
11213 | && (cap->is_error_expression() || cap->type()->is_error_type()))) | |
11214 | { | |
11215 | go_assert(saw_errors()); | |
11216 | return Expression::make_error(loc); | |
11217 | } | |
11218 | ||
2c809f8f | 11219 | Temporary_statement* temp; |
5bf8be8b | 11220 | if (array->type()->is_slice_type() && !array->is_variable()) |
35a54f17 | 11221 | { |
5bf8be8b | 11222 | temp = Statement::make_temporary(NULL, array, loc); |
35a54f17 | 11223 | inserter->insert(temp); |
11224 | this->array_ = Expression::make_temporary_reference(temp, loc); | |
11225 | } | |
5bf8be8b | 11226 | if (!start->is_variable()) |
2c809f8f | 11227 | { |
5bf8be8b | 11228 | temp = Statement::make_temporary(NULL, start, loc); |
2c809f8f | 11229 | inserter->insert(temp); |
11230 | this->start_ = Expression::make_temporary_reference(temp, loc); | |
11231 | } | |
5bf8be8b | 11232 | if (end != NULL |
11233 | && !end->is_nil_expression() | |
11234 | && !end->is_variable()) | |
2c809f8f | 11235 | { |
5bf8be8b | 11236 | temp = Statement::make_temporary(NULL, end, loc); |
2c809f8f | 11237 | inserter->insert(temp); |
11238 | this->end_ = Expression::make_temporary_reference(temp, loc); | |
11239 | } | |
03118c21 | 11240 | if (cap != NULL && !cap->is_variable()) |
2c809f8f | 11241 | { |
5bf8be8b | 11242 | temp = Statement::make_temporary(NULL, cap, loc); |
2c809f8f | 11243 | inserter->insert(temp); |
11244 | this->cap_ = Expression::make_temporary_reference(temp, loc); | |
11245 | } | |
11246 | ||
35a54f17 | 11247 | return this; |
11248 | } | |
11249 | ||
e440a328 | 11250 | // Return whether this expression is addressable. |
11251 | ||
11252 | bool | |
11253 | Array_index_expression::do_is_addressable() const | |
11254 | { | |
11255 | // A slice expression is not addressable. | |
11256 | if (this->end_ != NULL) | |
11257 | return false; | |
11258 | ||
11259 | // An index into a slice is addressable. | |
411eb89e | 11260 | if (this->array_->type()->is_slice_type()) |
e440a328 | 11261 | return true; |
11262 | ||
11263 | // An index into an array is addressable if the array is | |
11264 | // addressable. | |
11265 | return this->array_->is_addressable(); | |
11266 | } | |
11267 | ||
bf1323be | 11268 | void |
11269 | Array_index_expression::do_address_taken(bool escapes) | |
11270 | { | |
11271 | // In &x[0], if x is a slice, then x's address is not taken. | |
11272 | if (!this->array_->type()->is_slice_type()) | |
11273 | this->array_->address_taken(escapes); | |
11274 | } | |
11275 | ||
ea664253 | 11276 | // Get the backend representation for an array index. |
e440a328 | 11277 | |
ea664253 | 11278 | Bexpression* |
11279 | Array_index_expression::do_get_backend(Translate_context* context) | |
e440a328 | 11280 | { |
e440a328 | 11281 | Array_type* array_type = this->array_->type()->array_type(); |
d8cd8e2d | 11282 | if (array_type == NULL) |
11283 | { | |
c484d925 | 11284 | go_assert(this->array_->type()->is_error()); |
ea664253 | 11285 | return context->backend()->error_expression(); |
d8cd8e2d | 11286 | } |
35a54f17 | 11287 | go_assert(!array_type->is_slice_type() || this->array_->is_variable()); |
e440a328 | 11288 | |
2c809f8f | 11289 | Location loc = this->location(); |
11290 | Gogo* gogo = context->gogo(); | |
11291 | ||
6dfedc16 | 11292 | Type* int_type = Type::lookup_integer_type("int"); |
11293 | Btype* int_btype = int_type->get_backend(gogo); | |
e440a328 | 11294 | |
2c809f8f | 11295 | // We need to convert the length and capacity to the Go "int" type here |
11296 | // because the length of a fixed-length array could be of type "uintptr" | |
11297 | // and gimple disallows binary operations between "uintptr" and other | |
11298 | // integer types. FIXME. | |
11299 | Bexpression* length = NULL; | |
a04bfdfc | 11300 | if (this->end_ == NULL || this->end_->is_nil_expression()) |
11301 | { | |
35a54f17 | 11302 | Expression* len = array_type->get_length(gogo, this->array_); |
ea664253 | 11303 | length = len->get_backend(context); |
2c809f8f | 11304 | length = gogo->backend()->convert_expression(int_btype, length, loc); |
a04bfdfc | 11305 | } |
11306 | ||
2c809f8f | 11307 | Bexpression* capacity = NULL; |
a04bfdfc | 11308 | if (this->end_ != NULL) |
11309 | { | |
35a54f17 | 11310 | Expression* cap = array_type->get_capacity(gogo, this->array_); |
ea664253 | 11311 | capacity = cap->get_backend(context); |
2c809f8f | 11312 | capacity = gogo->backend()->convert_expression(int_btype, capacity, loc); |
a04bfdfc | 11313 | } |
11314 | ||
2c809f8f | 11315 | Bexpression* cap_arg = capacity; |
acf2b673 | 11316 | if (this->cap_ != NULL) |
11317 | { | |
ea664253 | 11318 | cap_arg = this->cap_->get_backend(context); |
2c809f8f | 11319 | cap_arg = gogo->backend()->convert_expression(int_btype, cap_arg, loc); |
acf2b673 | 11320 | } |
11321 | ||
2c809f8f | 11322 | if (length == NULL) |
11323 | length = cap_arg; | |
e440a328 | 11324 | |
11325 | int code = (array_type->length() != NULL | |
11326 | ? (this->end_ == NULL | |
11327 | ? RUNTIME_ERROR_ARRAY_INDEX_OUT_OF_BOUNDS | |
11328 | : RUNTIME_ERROR_ARRAY_SLICE_OUT_OF_BOUNDS) | |
11329 | : (this->end_ == NULL | |
11330 | ? RUNTIME_ERROR_SLICE_INDEX_OUT_OF_BOUNDS | |
11331 | : RUNTIME_ERROR_SLICE_SLICE_OUT_OF_BOUNDS)); | |
ea664253 | 11332 | Bexpression* crash = gogo->runtime_error(code, loc)->get_backend(context); |
2c809f8f | 11333 | |
6dfedc16 | 11334 | if (this->start_->type()->integer_type() == NULL |
11335 | && !Type::are_convertible(int_type, this->start_->type(), NULL)) | |
11336 | { | |
11337 | go_assert(saw_errors()); | |
11338 | return context->backend()->error_expression(); | |
11339 | } | |
d9f3743a | 11340 | |
ea664253 | 11341 | Bexpression* bad_index = |
d9f3743a | 11342 | Expression::check_bounds(this->start_, loc)->get_backend(context); |
2c809f8f | 11343 | |
ea664253 | 11344 | Bexpression* start = this->start_->get_backend(context); |
2c809f8f | 11345 | start = gogo->backend()->convert_expression(int_btype, start, loc); |
11346 | Bexpression* start_too_large = | |
11347 | gogo->backend()->binary_expression((this->end_ == NULL | |
11348 | ? OPERATOR_GE | |
11349 | : OPERATOR_GT), | |
11350 | start, | |
11351 | (this->end_ == NULL | |
11352 | ? length | |
11353 | : capacity), | |
11354 | loc); | |
11355 | bad_index = gogo->backend()->binary_expression(OPERATOR_OROR, start_too_large, | |
11356 | bad_index, loc); | |
e440a328 | 11357 | |
93715b75 | 11358 | Bfunction* bfn = context->function()->func_value()->get_decl(); |
e440a328 | 11359 | if (this->end_ == NULL) |
11360 | { | |
11361 | // Simple array indexing. This has to return an l-value, so | |
2c809f8f | 11362 | // wrap the index check into START. |
11363 | start = | |
93715b75 | 11364 | gogo->backend()->conditional_expression(bfn, int_btype, bad_index, |
2c809f8f | 11365 | crash, start, loc); |
e440a328 | 11366 | |
2c809f8f | 11367 | Bexpression* ret; |
e440a328 | 11368 | if (array_type->length() != NULL) |
11369 | { | |
ea664253 | 11370 | Bexpression* array = this->array_->get_backend(context); |
2c809f8f | 11371 | ret = gogo->backend()->array_index_expression(array, start, loc); |
e440a328 | 11372 | } |
11373 | else | |
11374 | { | |
2c809f8f | 11375 | // Slice. |
11376 | Expression* valptr = | |
44dbe1d7 | 11377 | array_type->get_value_pointer(gogo, this->array_, |
11378 | this->is_lvalue_); | |
ea664253 | 11379 | Bexpression* ptr = valptr->get_backend(context); |
2c809f8f | 11380 | ptr = gogo->backend()->pointer_offset_expression(ptr, start, loc); |
9b27b43c | 11381 | |
11382 | Type* ele_type = this->array_->type()->array_type()->element_type(); | |
11383 | Btype* ele_btype = ele_type->get_backend(gogo); | |
11384 | ret = gogo->backend()->indirect_expression(ele_btype, ptr, true, loc); | |
e440a328 | 11385 | } |
ea664253 | 11386 | return ret; |
e440a328 | 11387 | } |
11388 | ||
11389 | // Array slice. | |
11390 | ||
acf2b673 | 11391 | if (this->cap_ != NULL) |
11392 | { | |
2c809f8f | 11393 | Bexpression* bounds_bcheck = |
ea664253 | 11394 | Expression::check_bounds(this->cap_, loc)->get_backend(context); |
2c809f8f | 11395 | bad_index = |
11396 | gogo->backend()->binary_expression(OPERATOR_OROR, bounds_bcheck, | |
11397 | bad_index, loc); | |
11398 | cap_arg = gogo->backend()->convert_expression(int_btype, cap_arg, loc); | |
11399 | ||
11400 | Bexpression* cap_too_small = | |
11401 | gogo->backend()->binary_expression(OPERATOR_LT, cap_arg, start, loc); | |
11402 | Bexpression* cap_too_large = | |
11403 | gogo->backend()->binary_expression(OPERATOR_GT, cap_arg, capacity, loc); | |
11404 | Bexpression* bad_cap = | |
11405 | gogo->backend()->binary_expression(OPERATOR_OROR, cap_too_small, | |
11406 | cap_too_large, loc); | |
11407 | bad_index = gogo->backend()->binary_expression(OPERATOR_OROR, bad_cap, | |
11408 | bad_index, loc); | |
11409 | } | |
11410 | ||
11411 | Bexpression* end; | |
e440a328 | 11412 | if (this->end_->is_nil_expression()) |
2c809f8f | 11413 | end = length; |
e440a328 | 11414 | else |
11415 | { | |
2c809f8f | 11416 | Bexpression* bounds_bcheck = |
ea664253 | 11417 | Expression::check_bounds(this->end_, loc)->get_backend(context); |
e440a328 | 11418 | |
2c809f8f | 11419 | bad_index = |
11420 | gogo->backend()->binary_expression(OPERATOR_OROR, bounds_bcheck, | |
11421 | bad_index, loc); | |
e440a328 | 11422 | |
ea664253 | 11423 | end = this->end_->get_backend(context); |
2c809f8f | 11424 | end = gogo->backend()->convert_expression(int_btype, end, loc); |
11425 | Bexpression* end_too_small = | |
11426 | gogo->backend()->binary_expression(OPERATOR_LT, end, start, loc); | |
11427 | Bexpression* end_too_large = | |
11428 | gogo->backend()->binary_expression(OPERATOR_GT, end, cap_arg, loc); | |
11429 | Bexpression* bad_end = | |
11430 | gogo->backend()->binary_expression(OPERATOR_OROR, end_too_small, | |
11431 | end_too_large, loc); | |
11432 | bad_index = gogo->backend()->binary_expression(OPERATOR_OROR, bad_end, | |
11433 | bad_index, loc); | |
e440a328 | 11434 | } |
11435 | ||
2c809f8f | 11436 | Bexpression* result_length = |
11437 | gogo->backend()->binary_expression(OPERATOR_MINUS, end, start, loc); | |
e440a328 | 11438 | |
2c809f8f | 11439 | Bexpression* result_capacity = |
11440 | gogo->backend()->binary_expression(OPERATOR_MINUS, cap_arg, start, loc); | |
e440a328 | 11441 | |
03118c21 | 11442 | // If the new capacity is zero, don't change val. Otherwise we can |
11443 | // get a pointer to the next object in memory, keeping it live | |
11444 | // unnecessarily. When the capacity is zero, the actual pointer | |
11445 | // value doesn't matter. | |
11446 | Bexpression* zero = | |
11447 | Expression::make_integer_ul(0, int_type, loc)->get_backend(context); | |
11448 | Bexpression* cond = | |
11449 | gogo->backend()->binary_expression(OPERATOR_EQEQ, result_capacity, zero, | |
11450 | loc); | |
11451 | Bexpression* offset = gogo->backend()->conditional_expression(bfn, int_btype, | |
11452 | cond, zero, | |
11453 | start, loc); | |
44dbe1d7 | 11454 | Expression* valptr = array_type->get_value_pointer(gogo, this->array_, |
11455 | this->is_lvalue_); | |
03118c21 | 11456 | Bexpression* val = valptr->get_backend(context); |
11457 | val = gogo->backend()->pointer_offset_expression(val, offset, loc); | |
11458 | ||
2c809f8f | 11459 | Btype* struct_btype = this->type()->get_backend(gogo); |
11460 | std::vector<Bexpression*> init; | |
11461 | init.push_back(val); | |
11462 | init.push_back(result_length); | |
11463 | init.push_back(result_capacity); | |
e440a328 | 11464 | |
2c809f8f | 11465 | Bexpression* ctor = |
11466 | gogo->backend()->constructor_expression(struct_btype, init, loc); | |
93715b75 | 11467 | return gogo->backend()->conditional_expression(bfn, struct_btype, bad_index, |
ea664253 | 11468 | crash, ctor, loc); |
e440a328 | 11469 | } |
11470 | ||
d751bb78 | 11471 | // Dump ast representation for an array index expression. |
11472 | ||
11473 | void | |
11474 | Array_index_expression::do_dump_expression(Ast_dump_context* ast_dump_context) | |
11475 | const | |
11476 | { | |
11477 | Index_expression::dump_index_expression(ast_dump_context, this->array_, | |
acf2b673 | 11478 | this->start_, this->end_, this->cap_); |
d751bb78 | 11479 | } |
11480 | ||
acf2b673 | 11481 | // Make an array index expression. END and CAP may be NULL. |
e440a328 | 11482 | |
11483 | Expression* | |
11484 | Expression::make_array_index(Expression* array, Expression* start, | |
acf2b673 | 11485 | Expression* end, Expression* cap, |
11486 | Location location) | |
e440a328 | 11487 | { |
acf2b673 | 11488 | return new Array_index_expression(array, start, end, cap, location); |
e440a328 | 11489 | } |
11490 | ||
50075d74 | 11491 | // Class String_index_expression. |
e440a328 | 11492 | |
11493 | // String index traversal. | |
11494 | ||
11495 | int | |
11496 | String_index_expression::do_traverse(Traverse* traverse) | |
11497 | { | |
11498 | if (Expression::traverse(&this->string_, traverse) == TRAVERSE_EXIT) | |
11499 | return TRAVERSE_EXIT; | |
11500 | if (Expression::traverse(&this->start_, traverse) == TRAVERSE_EXIT) | |
11501 | return TRAVERSE_EXIT; | |
11502 | if (this->end_ != NULL) | |
11503 | { | |
11504 | if (Expression::traverse(&this->end_, traverse) == TRAVERSE_EXIT) | |
11505 | return TRAVERSE_EXIT; | |
11506 | } | |
11507 | return TRAVERSE_CONTINUE; | |
11508 | } | |
11509 | ||
2c809f8f | 11510 | Expression* |
11511 | String_index_expression::do_flatten(Gogo*, Named_object*, | |
11512 | Statement_inserter* inserter) | |
e440a328 | 11513 | { |
2c809f8f | 11514 | Location loc = this->location(); |
5bf8be8b | 11515 | Expression* string = this->string_; |
11516 | Expression* start = this->start_; | |
11517 | Expression* end = this->end_; | |
11518 | if (string->is_error_expression() | |
11519 | || string->type()->is_error_type() | |
11520 | || start->is_error_expression() | |
11521 | || start->type()->is_error_type() | |
11522 | || (end != NULL | |
11523 | && (end->is_error_expression() || end->type()->is_error_type()))) | |
11524 | { | |
11525 | go_assert(saw_errors()); | |
11526 | return Expression::make_error(loc); | |
11527 | } | |
11528 | ||
11529 | Temporary_statement* temp; | |
2c809f8f | 11530 | if (!this->string_->is_variable()) |
11531 | { | |
11532 | temp = Statement::make_temporary(NULL, this->string_, loc); | |
11533 | inserter->insert(temp); | |
11534 | this->string_ = Expression::make_temporary_reference(temp, loc); | |
11535 | } | |
11536 | if (!this->start_->is_variable()) | |
11537 | { | |
11538 | temp = Statement::make_temporary(NULL, this->start_, loc); | |
11539 | inserter->insert(temp); | |
11540 | this->start_ = Expression::make_temporary_reference(temp, loc); | |
11541 | } | |
11542 | if (this->end_ != NULL | |
11543 | && !this->end_->is_nil_expression() | |
11544 | && !this->end_->is_variable()) | |
11545 | { | |
11546 | temp = Statement::make_temporary(NULL, this->end_, loc); | |
11547 | inserter->insert(temp); | |
11548 | this->end_ = Expression::make_temporary_reference(temp, loc); | |
11549 | } | |
11550 | ||
11551 | return this; | |
11552 | } | |
11553 | ||
11554 | // Return the type of a string index. | |
11555 | ||
11556 | Type* | |
11557 | String_index_expression::do_type() | |
11558 | { | |
11559 | if (this->end_ == NULL) | |
11560 | return Type::lookup_integer_type("uint8"); | |
11561 | else | |
11562 | return this->string_->type(); | |
11563 | } | |
11564 | ||
11565 | // Determine the type of a string index. | |
11566 | ||
11567 | void | |
11568 | String_index_expression::do_determine_type(const Type_context*) | |
11569 | { | |
11570 | this->string_->determine_type_no_context(); | |
f77aa642 | 11571 | |
11572 | Type_context index_context(Type::lookup_integer_type("int"), false); | |
11573 | if (this->start_->is_constant()) | |
11574 | this->start_->determine_type(&index_context); | |
11575 | else | |
11576 | this->start_->determine_type_no_context(); | |
e440a328 | 11577 | if (this->end_ != NULL) |
f77aa642 | 11578 | { |
11579 | if (this->end_->is_constant()) | |
11580 | this->end_->determine_type(&index_context); | |
11581 | else | |
11582 | this->end_->determine_type_no_context(); | |
11583 | } | |
e440a328 | 11584 | } |
11585 | ||
11586 | // Check types of a string index. | |
11587 | ||
11588 | void | |
11589 | String_index_expression::do_check_types(Gogo*) | |
11590 | { | |
acdc230d | 11591 | Numeric_constant nc; |
11592 | unsigned long v; | |
11593 | if (this->start_->type()->integer_type() == NULL | |
11594 | && !this->start_->type()->is_error() | |
11595 | && (!this->start_->numeric_constant_value(&nc) | |
11596 | || nc.to_unsigned_long(&v) == Numeric_constant::NC_UL_NOTINT)) | |
e440a328 | 11597 | this->report_error(_("index must be integer")); |
11598 | if (this->end_ != NULL | |
11599 | && this->end_->type()->integer_type() == NULL | |
acdc230d | 11600 | && !this->end_->type()->is_error() |
11601 | && !this->end_->is_nil_expression() | |
11602 | && !this->end_->is_error_expression() | |
11603 | && (!this->end_->numeric_constant_value(&nc) | |
11604 | || nc.to_unsigned_long(&v) == Numeric_constant::NC_UL_NOTINT)) | |
e440a328 | 11605 | this->report_error(_("slice end must be integer")); |
11606 | ||
11607 | std::string sval; | |
11608 | bool sval_valid = this->string_->string_constant_value(&sval); | |
11609 | ||
0c77715b | 11610 | Numeric_constant inc; |
e440a328 | 11611 | mpz_t ival; |
0bd5d859 | 11612 | bool ival_valid = false; |
0c77715b | 11613 | if (this->start_->numeric_constant_value(&inc) && inc.to_int(&ival)) |
e440a328 | 11614 | { |
0bd5d859 | 11615 | ival_valid = true; |
e440a328 | 11616 | if (mpz_sgn(ival) < 0 |
b10f32fb | 11617 | || (sval_valid |
11618 | && (this->end_ == NULL | |
11619 | ? mpz_cmp_ui(ival, sval.length()) >= 0 | |
11620 | : mpz_cmp_ui(ival, sval.length()) > 0))) | |
e440a328 | 11621 | { |
631d5788 | 11622 | go_error_at(this->start_->location(), "string index out of bounds"); |
e440a328 | 11623 | this->set_is_error(); |
11624 | } | |
11625 | } | |
11626 | if (this->end_ != NULL && !this->end_->is_nil_expression()) | |
11627 | { | |
0c77715b | 11628 | Numeric_constant enc; |
11629 | mpz_t eval; | |
11630 | if (this->end_->numeric_constant_value(&enc) && enc.to_int(&eval)) | |
e440a328 | 11631 | { |
0c77715b | 11632 | if (mpz_sgn(eval) < 0 |
11633 | || (sval_valid && mpz_cmp_ui(eval, sval.length()) > 0)) | |
e440a328 | 11634 | { |
631d5788 | 11635 | go_error_at(this->end_->location(), "string index out of bounds"); |
e440a328 | 11636 | this->set_is_error(); |
11637 | } | |
0bd5d859 | 11638 | else if (ival_valid && mpz_cmp(ival, eval) > 0) |
11639 | this->report_error(_("inverted slice range")); | |
0c77715b | 11640 | mpz_clear(eval); |
e440a328 | 11641 | } |
11642 | } | |
0bd5d859 | 11643 | if (ival_valid) |
11644 | mpz_clear(ival); | |
e440a328 | 11645 | } |
11646 | ||
ea664253 | 11647 | // Get the backend representation for a string index. |
e440a328 | 11648 | |
ea664253 | 11649 | Bexpression* |
11650 | String_index_expression::do_get_backend(Translate_context* context) | |
e440a328 | 11651 | { |
b13c66cd | 11652 | Location loc = this->location(); |
2c809f8f | 11653 | Expression* string_arg = this->string_; |
11654 | if (this->string_->type()->points_to() != NULL) | |
f614ea8b | 11655 | string_arg = Expression::make_dereference(this->string_, |
11656 | NIL_CHECK_NOT_NEEDED, loc); | |
e440a328 | 11657 | |
2c809f8f | 11658 | Expression* bad_index = Expression::check_bounds(this->start_, loc); |
e440a328 | 11659 | |
2c809f8f | 11660 | int code = (this->end_ == NULL |
11661 | ? RUNTIME_ERROR_STRING_INDEX_OUT_OF_BOUNDS | |
11662 | : RUNTIME_ERROR_STRING_SLICE_OUT_OF_BOUNDS); | |
e440a328 | 11663 | |
2c809f8f | 11664 | Gogo* gogo = context->gogo(); |
ea664253 | 11665 | Bexpression* crash = gogo->runtime_error(code, loc)->get_backend(context); |
1b1f2abf | 11666 | |
11667 | Type* int_type = Type::lookup_integer_type("int"); | |
e440a328 | 11668 | |
2c809f8f | 11669 | // It is possible that an error occurred earlier because the start index |
11670 | // cannot be represented as an integer type. In this case, we shouldn't | |
11671 | // try casting the starting index into an integer since | |
11672 | // Type_conversion_expression will fail to get the backend representation. | |
11673 | // FIXME. | |
11674 | if (this->start_->type()->integer_type() == NULL | |
11675 | && !Type::are_convertible(int_type, this->start_->type(), NULL)) | |
11676 | { | |
11677 | go_assert(saw_errors()); | |
ea664253 | 11678 | return context->backend()->error_expression(); |
2c809f8f | 11679 | } |
e440a328 | 11680 | |
2c809f8f | 11681 | Expression* start = Expression::make_cast(int_type, this->start_, loc); |
93715b75 | 11682 | Bfunction* bfn = context->function()->func_value()->get_decl(); |
e440a328 | 11683 | |
2c809f8f | 11684 | if (this->end_ == NULL) |
11685 | { | |
11686 | Expression* length = | |
11687 | Expression::make_string_info(this->string_, STRING_INFO_LENGTH, loc); | |
e440a328 | 11688 | |
2c809f8f | 11689 | Expression* start_too_large = |
11690 | Expression::make_binary(OPERATOR_GE, start, length, loc); | |
11691 | bad_index = Expression::make_binary(OPERATOR_OROR, start_too_large, | |
11692 | bad_index, loc); | |
11693 | Expression* bytes = | |
11694 | Expression::make_string_info(this->string_, STRING_INFO_DATA, loc); | |
e440a328 | 11695 | |
ea664253 | 11696 | Bexpression* bstart = start->get_backend(context); |
11697 | Bexpression* ptr = bytes->get_backend(context); | |
2c809f8f | 11698 | ptr = gogo->backend()->pointer_offset_expression(ptr, bstart, loc); |
9b27b43c | 11699 | Btype* ubtype = Type::lookup_integer_type("uint8")->get_backend(gogo); |
11700 | Bexpression* index = | |
11701 | gogo->backend()->indirect_expression(ubtype, ptr, true, loc); | |
e440a328 | 11702 | |
2c809f8f | 11703 | Btype* byte_btype = bytes->type()->points_to()->get_backend(gogo); |
ea664253 | 11704 | Bexpression* index_error = bad_index->get_backend(context); |
93715b75 | 11705 | return gogo->backend()->conditional_expression(bfn, byte_btype, |
11706 | index_error, crash, | |
11707 | index, loc); | |
2c809f8f | 11708 | } |
11709 | ||
11710 | Expression* end = NULL; | |
11711 | if (this->end_->is_nil_expression()) | |
e67508fa | 11712 | end = Expression::make_integer_sl(-1, int_type, loc); |
e440a328 | 11713 | else |
11714 | { | |
2c809f8f | 11715 | Expression* bounds_check = Expression::check_bounds(this->end_, loc); |
11716 | bad_index = | |
11717 | Expression::make_binary(OPERATOR_OROR, bounds_check, bad_index, loc); | |
11718 | end = Expression::make_cast(int_type, this->end_, loc); | |
e440a328 | 11719 | } |
2c809f8f | 11720 | |
11721 | Expression* strslice = Runtime::make_call(Runtime::STRING_SLICE, loc, 3, | |
11722 | string_arg, start, end); | |
ea664253 | 11723 | Bexpression* bstrslice = strslice->get_backend(context); |
2c809f8f | 11724 | |
11725 | Btype* str_btype = strslice->type()->get_backend(gogo); | |
ea664253 | 11726 | Bexpression* index_error = bad_index->get_backend(context); |
93715b75 | 11727 | return gogo->backend()->conditional_expression(bfn, str_btype, index_error, |
ea664253 | 11728 | crash, bstrslice, loc); |
e440a328 | 11729 | } |
11730 | ||
d751bb78 | 11731 | // Dump ast representation for a string index expression. |
11732 | ||
11733 | void | |
11734 | String_index_expression::do_dump_expression(Ast_dump_context* ast_dump_context) | |
11735 | const | |
11736 | { | |
acf2b673 | 11737 | Index_expression::dump_index_expression(ast_dump_context, this->string_, |
11738 | this->start_, this->end_, NULL); | |
d751bb78 | 11739 | } |
11740 | ||
e440a328 | 11741 | // Make a string index expression. END may be NULL. |
11742 | ||
11743 | Expression* | |
11744 | Expression::make_string_index(Expression* string, Expression* start, | |
b13c66cd | 11745 | Expression* end, Location location) |
e440a328 | 11746 | { |
11747 | return new String_index_expression(string, start, end, location); | |
11748 | } | |
11749 | ||
11750 | // Class Map_index. | |
11751 | ||
11752 | // Get the type of the map. | |
11753 | ||
11754 | Map_type* | |
11755 | Map_index_expression::get_map_type() const | |
11756 | { | |
0d5530d9 | 11757 | Map_type* mt = this->map_->type()->map_type(); |
c7524fae | 11758 | if (mt == NULL) |
c484d925 | 11759 | go_assert(saw_errors()); |
e440a328 | 11760 | return mt; |
11761 | } | |
11762 | ||
11763 | // Map index traversal. | |
11764 | ||
11765 | int | |
11766 | Map_index_expression::do_traverse(Traverse* traverse) | |
11767 | { | |
11768 | if (Expression::traverse(&this->map_, traverse) == TRAVERSE_EXIT) | |
11769 | return TRAVERSE_EXIT; | |
11770 | return Expression::traverse(&this->index_, traverse); | |
11771 | } | |
11772 | ||
2c809f8f | 11773 | // We need to pass in a pointer to the key, so flatten the index into a |
11774 | // temporary variable if it isn't already. The value pointer will be | |
11775 | // dereferenced and checked for nil, so flatten into a temporary to avoid | |
11776 | // recomputation. | |
11777 | ||
11778 | Expression* | |
91c0fd76 | 11779 | Map_index_expression::do_flatten(Gogo* gogo, Named_object*, |
2c809f8f | 11780 | Statement_inserter* inserter) |
11781 | { | |
91c0fd76 | 11782 | Location loc = this->location(); |
2c809f8f | 11783 | Map_type* mt = this->get_map_type(); |
5bf8be8b | 11784 | if (this->index()->is_error_expression() |
11785 | || this->index()->type()->is_error_type() | |
11786 | || mt->is_error_type()) | |
11787 | { | |
11788 | go_assert(saw_errors()); | |
11789 | return Expression::make_error(loc); | |
11790 | } | |
11791 | ||
3a522dcc | 11792 | if (!Type::are_identical(mt->key_type(), this->index_->type(), |
11793 | Type::COMPARE_ERRORS | Type::COMPARE_TAGS, | |
11794 | NULL)) | |
91c0fd76 | 11795 | { |
11796 | if (this->index_->type()->interface_type() != NULL | |
11797 | && !this->index_->is_variable()) | |
11798 | { | |
11799 | Temporary_statement* temp = | |
11800 | Statement::make_temporary(NULL, this->index_, loc); | |
11801 | inserter->insert(temp); | |
11802 | this->index_ = Expression::make_temporary_reference(temp, loc); | |
11803 | } | |
11804 | this->index_ = Expression::convert_for_assignment(gogo, mt->key_type(), | |
11805 | this->index_, loc); | |
11806 | } | |
2c809f8f | 11807 | |
11808 | if (!this->index_->is_variable()) | |
11809 | { | |
11810 | Temporary_statement* temp = Statement::make_temporary(NULL, this->index_, | |
91c0fd76 | 11811 | loc); |
2c809f8f | 11812 | inserter->insert(temp); |
91c0fd76 | 11813 | this->index_ = Expression::make_temporary_reference(temp, loc); |
2c809f8f | 11814 | } |
11815 | ||
11816 | if (this->value_pointer_ == NULL) | |
0d5530d9 | 11817 | this->get_value_pointer(gogo); |
5bf8be8b | 11818 | if (this->value_pointer_->is_error_expression() |
11819 | || this->value_pointer_->type()->is_error_type()) | |
11820 | return Expression::make_error(loc); | |
2c809f8f | 11821 | if (!this->value_pointer_->is_variable()) |
11822 | { | |
11823 | Temporary_statement* temp = | |
91c0fd76 | 11824 | Statement::make_temporary(NULL, this->value_pointer_, loc); |
2c809f8f | 11825 | inserter->insert(temp); |
91c0fd76 | 11826 | this->value_pointer_ = Expression::make_temporary_reference(temp, loc); |
2c809f8f | 11827 | } |
11828 | ||
11829 | return this; | |
11830 | } | |
11831 | ||
e440a328 | 11832 | // Return the type of a map index. |
11833 | ||
11834 | Type* | |
11835 | Map_index_expression::do_type() | |
11836 | { | |
c7524fae | 11837 | Map_type* mt = this->get_map_type(); |
11838 | if (mt == NULL) | |
11839 | return Type::make_error_type(); | |
0d5530d9 | 11840 | return mt->val_type(); |
e440a328 | 11841 | } |
11842 | ||
11843 | // Fix the type of a map index. | |
11844 | ||
11845 | void | |
11846 | Map_index_expression::do_determine_type(const Type_context*) | |
11847 | { | |
11848 | this->map_->determine_type_no_context(); | |
c7524fae | 11849 | Map_type* mt = this->get_map_type(); |
11850 | Type* key_type = mt == NULL ? NULL : mt->key_type(); | |
11851 | Type_context subcontext(key_type, false); | |
e440a328 | 11852 | this->index_->determine_type(&subcontext); |
11853 | } | |
11854 | ||
11855 | // Check types of a map index. | |
11856 | ||
11857 | void | |
11858 | Map_index_expression::do_check_types(Gogo*) | |
11859 | { | |
11860 | std::string reason; | |
c7524fae | 11861 | Map_type* mt = this->get_map_type(); |
11862 | if (mt == NULL) | |
11863 | return; | |
11864 | if (!Type::are_assignable(mt->key_type(), this->index_->type(), &reason)) | |
e440a328 | 11865 | { |
11866 | if (reason.empty()) | |
11867 | this->report_error(_("incompatible type for map index")); | |
11868 | else | |
11869 | { | |
631d5788 | 11870 | go_error_at(this->location(), "incompatible type for map index (%s)", |
11871 | reason.c_str()); | |
e440a328 | 11872 | this->set_is_error(); |
11873 | } | |
11874 | } | |
11875 | } | |
11876 | ||
ea664253 | 11877 | // Get the backend representation for a map index. |
e440a328 | 11878 | |
ea664253 | 11879 | Bexpression* |
11880 | Map_index_expression::do_get_backend(Translate_context* context) | |
e440a328 | 11881 | { |
11882 | Map_type* type = this->get_map_type(); | |
c7524fae | 11883 | if (type == NULL) |
2c809f8f | 11884 | { |
11885 | go_assert(saw_errors()); | |
ea664253 | 11886 | return context->backend()->error_expression(); |
2c809f8f | 11887 | } |
e440a328 | 11888 | |
2c809f8f | 11889 | go_assert(this->value_pointer_ != NULL |
11890 | && this->value_pointer_->is_variable()); | |
e440a328 | 11891 | |
f614ea8b | 11892 | Expression* val = Expression::make_dereference(this->value_pointer_, |
11893 | NIL_CHECK_NOT_NEEDED, | |
11894 | this->location()); | |
0d5530d9 | 11895 | return val->get_backend(context); |
e440a328 | 11896 | } |
11897 | ||
0d5530d9 | 11898 | // Get an expression for the map index. This returns an expression |
11899 | // that evaluates to a pointer to a value. If the key is not in the | |
11900 | // map, the pointer will point to a zero value. | |
e440a328 | 11901 | |
2c809f8f | 11902 | Expression* |
0d5530d9 | 11903 | Map_index_expression::get_value_pointer(Gogo* gogo) |
e440a328 | 11904 | { |
2c809f8f | 11905 | if (this->value_pointer_ == NULL) |
746d2e73 | 11906 | { |
2c809f8f | 11907 | Map_type* type = this->get_map_type(); |
11908 | if (type == NULL) | |
746d2e73 | 11909 | { |
2c809f8f | 11910 | go_assert(saw_errors()); |
11911 | return Expression::make_error(this->location()); | |
746d2e73 | 11912 | } |
e440a328 | 11913 | |
2c809f8f | 11914 | Location loc = this->location(); |
11915 | Expression* map_ref = this->map_; | |
e440a328 | 11916 | |
0d5530d9 | 11917 | Expression* index_ptr = Expression::make_unary(OPERATOR_AND, |
11918 | this->index_, | |
2c809f8f | 11919 | loc); |
0d5530d9 | 11920 | |
11921 | Expression* zero = type->fat_zero_value(gogo); | |
11922 | ||
11923 | Expression* map_index; | |
11924 | ||
11925 | if (zero == NULL) | |
11926 | map_index = | |
11927 | Runtime::make_call(Runtime::MAPACCESS1, loc, 3, | |
11928 | Expression::make_type_descriptor(type, loc), | |
11929 | map_ref, index_ptr); | |
11930 | else | |
11931 | map_index = | |
11932 | Runtime::make_call(Runtime::MAPACCESS1_FAT, loc, 4, | |
11933 | Expression::make_type_descriptor(type, loc), | |
11934 | map_ref, index_ptr, zero); | |
2c809f8f | 11935 | |
11936 | Type* val_type = type->val_type(); | |
11937 | this->value_pointer_ = | |
11938 | Expression::make_unsafe_cast(Type::make_pointer_type(val_type), | |
11939 | map_index, this->location()); | |
11940 | } | |
0d5530d9 | 11941 | |
2c809f8f | 11942 | return this->value_pointer_; |
e440a328 | 11943 | } |
11944 | ||
d751bb78 | 11945 | // Dump ast representation for a map index expression |
11946 | ||
11947 | void | |
11948 | Map_index_expression::do_dump_expression(Ast_dump_context* ast_dump_context) | |
11949 | const | |
11950 | { | |
acf2b673 | 11951 | Index_expression::dump_index_expression(ast_dump_context, this->map_, |
11952 | this->index_, NULL, NULL); | |
d751bb78 | 11953 | } |
11954 | ||
e440a328 | 11955 | // Make a map index expression. |
11956 | ||
11957 | Map_index_expression* | |
11958 | Expression::make_map_index(Expression* map, Expression* index, | |
b13c66cd | 11959 | Location location) |
e440a328 | 11960 | { |
11961 | return new Map_index_expression(map, index, location); | |
11962 | } | |
11963 | ||
11964 | // Class Field_reference_expression. | |
11965 | ||
149eabc5 | 11966 | // Lower a field reference expression. There is nothing to lower, but |
11967 | // this is where we generate the tracking information for fields with | |
11968 | // the magic go:"track" tag. | |
11969 | ||
11970 | Expression* | |
11971 | Field_reference_expression::do_lower(Gogo* gogo, Named_object* function, | |
11972 | Statement_inserter* inserter, int) | |
11973 | { | |
11974 | Struct_type* struct_type = this->expr_->type()->struct_type(); | |
11975 | if (struct_type == NULL) | |
11976 | { | |
11977 | // Error will be reported elsewhere. | |
11978 | return this; | |
11979 | } | |
11980 | const Struct_field* field = struct_type->field(this->field_index_); | |
11981 | if (field == NULL) | |
11982 | return this; | |
11983 | if (!field->has_tag()) | |
11984 | return this; | |
11985 | if (field->tag().find("go:\"track\"") == std::string::npos) | |
11986 | return this; | |
11987 | ||
604e278d | 11988 | // References from functions generated by the compiler don't count. |
c6292d1d | 11989 | if (function != NULL && function->func_value()->is_type_specific_function()) |
604e278d | 11990 | return this; |
11991 | ||
149eabc5 | 11992 | // We have found a reference to a tracked field. Build a call to |
11993 | // the runtime function __go_fieldtrack with a string that describes | |
11994 | // the field. FIXME: We should only call this once per referenced | |
11995 | // field per function, not once for each reference to the field. | |
11996 | ||
11997 | if (this->called_fieldtrack_) | |
11998 | return this; | |
11999 | this->called_fieldtrack_ = true; | |
12000 | ||
12001 | Location loc = this->location(); | |
12002 | ||
12003 | std::string s = "fieldtrack \""; | |
e65055a5 | 12004 | Named_type* nt = this->expr_->type()->unalias()->named_type(); |
149eabc5 | 12005 | if (nt == NULL || nt->named_object()->package() == NULL) |
12006 | s.append(gogo->pkgpath()); | |
12007 | else | |
12008 | s.append(nt->named_object()->package()->pkgpath()); | |
12009 | s.push_back('.'); | |
12010 | if (nt != NULL) | |
5c29ad36 | 12011 | s.append(Gogo::unpack_hidden_name(nt->name())); |
149eabc5 | 12012 | s.push_back('.'); |
12013 | s.append(field->field_name()); | |
12014 | s.push_back('"'); | |
12015 | ||
12016 | // We can't use a string here, because internally a string holds a | |
12017 | // pointer to the actual bytes; when the linker garbage collects the | |
12018 | // string, it won't garbage collect the bytes. So we use a | |
12019 | // [...]byte. | |
12020 | ||
e67508fa | 12021 | Expression* length_expr = Expression::make_integer_ul(s.length(), NULL, loc); |
149eabc5 | 12022 | |
12023 | Type* byte_type = gogo->lookup_global("byte")->type_value(); | |
6bf4793c | 12024 | Array_type* array_type = Type::make_array_type(byte_type, length_expr); |
12025 | array_type->set_is_array_incomparable(); | |
149eabc5 | 12026 | |
12027 | Expression_list* bytes = new Expression_list(); | |
12028 | for (std::string::const_iterator p = s.begin(); p != s.end(); p++) | |
12029 | { | |
e67508fa | 12030 | unsigned char c = static_cast<unsigned char>(*p); |
12031 | bytes->push_back(Expression::make_integer_ul(c, NULL, loc)); | |
149eabc5 | 12032 | } |
12033 | ||
12034 | Expression* e = Expression::make_composite_literal(array_type, 0, false, | |
62750cd5 | 12035 | bytes, false, loc); |
149eabc5 | 12036 | |
12037 | Variable* var = new Variable(array_type, e, true, false, false, loc); | |
12038 | ||
12039 | static int count; | |
12040 | char buf[50]; | |
12041 | snprintf(buf, sizeof buf, "fieldtrack.%d", count); | |
12042 | ++count; | |
12043 | ||
12044 | Named_object* no = gogo->add_variable(buf, var); | |
12045 | e = Expression::make_var_reference(no, loc); | |
12046 | e = Expression::make_unary(OPERATOR_AND, e, loc); | |
12047 | ||
12048 | Expression* call = Runtime::make_call(Runtime::FIELDTRACK, loc, 1, e); | |
604e278d | 12049 | gogo->lower_expression(function, inserter, &call); |
149eabc5 | 12050 | inserter->insert(Statement::make_statement(call, false)); |
12051 | ||
12052 | // Put this function, and the global variable we just created, into | |
12053 | // unique sections. This will permit the linker to garbage collect | |
12054 | // them if they are not referenced. The effect is that the only | |
12055 | // strings, indicating field references, that will wind up in the | |
12056 | // executable will be those for functions that are actually needed. | |
66a6be58 | 12057 | if (function != NULL) |
12058 | function->func_value()->set_in_unique_section(); | |
149eabc5 | 12059 | var->set_in_unique_section(); |
12060 | ||
12061 | return this; | |
12062 | } | |
12063 | ||
e440a328 | 12064 | // Return the type of a field reference. |
12065 | ||
12066 | Type* | |
12067 | Field_reference_expression::do_type() | |
12068 | { | |
b0e628fb | 12069 | Type* type = this->expr_->type(); |
5c13bd80 | 12070 | if (type->is_error()) |
b0e628fb | 12071 | return type; |
12072 | Struct_type* struct_type = type->struct_type(); | |
c484d925 | 12073 | go_assert(struct_type != NULL); |
e440a328 | 12074 | return struct_type->field(this->field_index_)->type(); |
12075 | } | |
12076 | ||
12077 | // Check the types for a field reference. | |
12078 | ||
12079 | void | |
12080 | Field_reference_expression::do_check_types(Gogo*) | |
12081 | { | |
b0e628fb | 12082 | Type* type = this->expr_->type(); |
5c13bd80 | 12083 | if (type->is_error()) |
b0e628fb | 12084 | return; |
12085 | Struct_type* struct_type = type->struct_type(); | |
c484d925 | 12086 | go_assert(struct_type != NULL); |
12087 | go_assert(struct_type->field(this->field_index_) != NULL); | |
e440a328 | 12088 | } |
12089 | ||
ea664253 | 12090 | // Get the backend representation for a field reference. |
e440a328 | 12091 | |
ea664253 | 12092 | Bexpression* |
12093 | Field_reference_expression::do_get_backend(Translate_context* context) | |
e440a328 | 12094 | { |
ea664253 | 12095 | Bexpression* bstruct = this->expr_->get_backend(context); |
12096 | return context->gogo()->backend()->struct_field_expression(bstruct, | |
12097 | this->field_index_, | |
12098 | this->location()); | |
e440a328 | 12099 | } |
12100 | ||
d751bb78 | 12101 | // Dump ast representation for a field reference expression. |
12102 | ||
12103 | void | |
12104 | Field_reference_expression::do_dump_expression( | |
12105 | Ast_dump_context* ast_dump_context) const | |
12106 | { | |
12107 | this->expr_->dump_expression(ast_dump_context); | |
12108 | ast_dump_context->ostream() << "." << this->field_index_; | |
12109 | } | |
12110 | ||
e440a328 | 12111 | // Make a reference to a qualified identifier in an expression. |
12112 | ||
12113 | Field_reference_expression* | |
12114 | Expression::make_field_reference(Expression* expr, unsigned int field_index, | |
b13c66cd | 12115 | Location location) |
e440a328 | 12116 | { |
12117 | return new Field_reference_expression(expr, field_index, location); | |
12118 | } | |
12119 | ||
12120 | // Class Interface_field_reference_expression. | |
12121 | ||
2387f644 | 12122 | // Return an expression for the pointer to the function to call. |
e440a328 | 12123 | |
2387f644 | 12124 | Expression* |
12125 | Interface_field_reference_expression::get_function() | |
e440a328 | 12126 | { |
2387f644 | 12127 | Expression* ref = this->expr_; |
12128 | Location loc = this->location(); | |
12129 | if (ref->type()->points_to() != NULL) | |
f614ea8b | 12130 | ref = Expression::make_dereference(ref, NIL_CHECK_DEFAULT, loc); |
e440a328 | 12131 | |
2387f644 | 12132 | Expression* mtable = |
12133 | Expression::make_interface_info(ref, INTERFACE_INFO_METHODS, loc); | |
12134 | Struct_type* mtable_type = mtable->type()->points_to()->struct_type(); | |
e440a328 | 12135 | |
12136 | std::string name = Gogo::unpack_hidden_name(this->name_); | |
2387f644 | 12137 | unsigned int index; |
12138 | const Struct_field* field = mtable_type->find_local_field(name, &index); | |
12139 | go_assert(field != NULL); | |
f614ea8b | 12140 | |
12141 | mtable = Expression::make_dereference(mtable, NIL_CHECK_NOT_NEEDED, loc); | |
2387f644 | 12142 | return Expression::make_field_reference(mtable, index, loc); |
e440a328 | 12143 | } |
12144 | ||
2387f644 | 12145 | // Return an expression for the first argument to pass to the interface |
e440a328 | 12146 | // function. |
12147 | ||
2387f644 | 12148 | Expression* |
12149 | Interface_field_reference_expression::get_underlying_object() | |
e440a328 | 12150 | { |
2387f644 | 12151 | Expression* expr = this->expr_; |
12152 | if (expr->type()->points_to() != NULL) | |
f614ea8b | 12153 | expr = Expression::make_dereference(expr, NIL_CHECK_DEFAULT, |
12154 | this->location()); | |
2387f644 | 12155 | return Expression::make_interface_info(expr, INTERFACE_INFO_OBJECT, |
12156 | this->location()); | |
e440a328 | 12157 | } |
12158 | ||
12159 | // Traversal. | |
12160 | ||
12161 | int | |
12162 | Interface_field_reference_expression::do_traverse(Traverse* traverse) | |
12163 | { | |
12164 | return Expression::traverse(&this->expr_, traverse); | |
12165 | } | |
12166 | ||
0afbb937 | 12167 | // Lower the expression. If this expression is not called, we need to |
12168 | // evaluate the expression twice when converting to the backend | |
12169 | // interface. So introduce a temporary variable if necessary. | |
12170 | ||
12171 | Expression* | |
9782d556 | 12172 | Interface_field_reference_expression::do_flatten(Gogo*, Named_object*, |
12173 | Statement_inserter* inserter) | |
0afbb937 | 12174 | { |
5bf8be8b | 12175 | if (this->expr_->is_error_expression() |
12176 | || this->expr_->type()->is_error_type()) | |
12177 | { | |
12178 | go_assert(saw_errors()); | |
12179 | return Expression::make_error(this->location()); | |
12180 | } | |
12181 | ||
2387f644 | 12182 | if (!this->expr_->is_variable()) |
0afbb937 | 12183 | { |
12184 | Temporary_statement* temp = | |
9189e53b | 12185 | Statement::make_temporary(NULL, this->expr_, this->location()); |
0afbb937 | 12186 | inserter->insert(temp); |
9189e53b | 12187 | this->expr_ = Expression::make_temporary_reference(temp, this->location()); |
0afbb937 | 12188 | } |
12189 | return this; | |
12190 | } | |
12191 | ||
e440a328 | 12192 | // Return the type of an interface field reference. |
12193 | ||
12194 | Type* | |
12195 | Interface_field_reference_expression::do_type() | |
12196 | { | |
12197 | Type* expr_type = this->expr_->type(); | |
12198 | ||
12199 | Type* points_to = expr_type->points_to(); | |
12200 | if (points_to != NULL) | |
12201 | expr_type = points_to; | |
12202 | ||
12203 | Interface_type* interface_type = expr_type->interface_type(); | |
12204 | if (interface_type == NULL) | |
12205 | return Type::make_error_type(); | |
12206 | ||
12207 | const Typed_identifier* method = interface_type->find_method(this->name_); | |
12208 | if (method == NULL) | |
12209 | return Type::make_error_type(); | |
12210 | ||
12211 | return method->type(); | |
12212 | } | |
12213 | ||
12214 | // Determine types. | |
12215 | ||
12216 | void | |
12217 | Interface_field_reference_expression::do_determine_type(const Type_context*) | |
12218 | { | |
12219 | this->expr_->determine_type_no_context(); | |
12220 | } | |
12221 | ||
12222 | // Check the types for an interface field reference. | |
12223 | ||
12224 | void | |
12225 | Interface_field_reference_expression::do_check_types(Gogo*) | |
12226 | { | |
12227 | Type* type = this->expr_->type(); | |
12228 | ||
12229 | Type* points_to = type->points_to(); | |
12230 | if (points_to != NULL) | |
12231 | type = points_to; | |
12232 | ||
12233 | Interface_type* interface_type = type->interface_type(); | |
12234 | if (interface_type == NULL) | |
5c491127 | 12235 | { |
12236 | if (!type->is_error_type()) | |
12237 | this->report_error(_("expected interface or pointer to interface")); | |
12238 | } | |
e440a328 | 12239 | else |
12240 | { | |
12241 | const Typed_identifier* method = | |
12242 | interface_type->find_method(this->name_); | |
12243 | if (method == NULL) | |
12244 | { | |
631d5788 | 12245 | go_error_at(this->location(), "method %qs not in interface", |
12246 | Gogo::message_name(this->name_).c_str()); | |
e440a328 | 12247 | this->set_is_error(); |
12248 | } | |
12249 | } | |
12250 | } | |
12251 | ||
0afbb937 | 12252 | // If an interface field reference is not simply called, then it is |
12253 | // represented as a closure. The closure will hold a single variable, | |
12254 | // the value of the interface on which the method should be called. | |
12255 | // The function will be a simple thunk that pulls the value from the | |
12256 | // closure and calls the method with the remaining arguments. | |
12257 | ||
12258 | // Because method values are not common, we don't build all thunks for | |
12259 | // all possible interface methods, but instead only build them as we | |
12260 | // need them. In particular, we even build them on demand for | |
12261 | // interface methods defined in other packages. | |
12262 | ||
12263 | Interface_field_reference_expression::Interface_method_thunks | |
12264 | Interface_field_reference_expression::interface_method_thunks; | |
12265 | ||
12266 | // Find or create the thunk to call method NAME on TYPE. | |
12267 | ||
12268 | Named_object* | |
12269 | Interface_field_reference_expression::create_thunk(Gogo* gogo, | |
12270 | Interface_type* type, | |
12271 | const std::string& name) | |
12272 | { | |
12273 | std::pair<Interface_type*, Method_thunks*> val(type, NULL); | |
12274 | std::pair<Interface_method_thunks::iterator, bool> ins = | |
12275 | Interface_field_reference_expression::interface_method_thunks.insert(val); | |
12276 | if (ins.second) | |
12277 | { | |
12278 | // This is the first time we have seen this interface. | |
12279 | ins.first->second = new Method_thunks(); | |
12280 | } | |
12281 | ||
12282 | for (Method_thunks::const_iterator p = ins.first->second->begin(); | |
12283 | p != ins.first->second->end(); | |
12284 | p++) | |
12285 | if (p->first == name) | |
12286 | return p->second; | |
12287 | ||
12288 | Location loc = type->location(); | |
12289 | ||
12290 | const Typed_identifier* method_id = type->find_method(name); | |
12291 | if (method_id == NULL) | |
13f2fdb8 | 12292 | return Named_object::make_erroneous_name(gogo->thunk_name()); |
0afbb937 | 12293 | |
12294 | Function_type* orig_fntype = method_id->type()->function_type(); | |
12295 | if (orig_fntype == NULL) | |
13f2fdb8 | 12296 | return Named_object::make_erroneous_name(gogo->thunk_name()); |
0afbb937 | 12297 | |
12298 | Struct_field_list* sfl = new Struct_field_list(); | |
f8bdf81a | 12299 | // The type here is wrong--it should be the C function type. But it |
12300 | // doesn't really matter. | |
0afbb937 | 12301 | Type* vt = Type::make_pointer_type(Type::make_void_type()); |
13f2fdb8 | 12302 | sfl->push_back(Struct_field(Typed_identifier("fn", vt, loc))); |
12303 | sfl->push_back(Struct_field(Typed_identifier("val", type, loc))); | |
6bf4793c | 12304 | Struct_type* st = Type::make_struct_type(sfl, loc); |
12305 | st->set_is_struct_incomparable(); | |
12306 | Type* closure_type = Type::make_pointer_type(st); | |
0afbb937 | 12307 | |
f8bdf81a | 12308 | Function_type* new_fntype = orig_fntype->copy_with_names(); |
0afbb937 | 12309 | |
13f2fdb8 | 12310 | std::string thunk_name = gogo->thunk_name(); |
da244e59 | 12311 | Named_object* new_no = gogo->start_function(thunk_name, new_fntype, |
0afbb937 | 12312 | false, loc); |
12313 | ||
f8bdf81a | 12314 | Variable* cvar = new Variable(closure_type, NULL, false, false, false, loc); |
12315 | cvar->set_is_used(); | |
1ecc6157 | 12316 | cvar->set_is_closure(); |
da244e59 | 12317 | Named_object* cp = Named_object::make_variable("$closure" + thunk_name, |
12318 | NULL, cvar); | |
f8bdf81a | 12319 | new_no->func_value()->set_closure_var(cp); |
0afbb937 | 12320 | |
f8bdf81a | 12321 | gogo->start_block(loc); |
0afbb937 | 12322 | |
12323 | // Field 0 of the closure is the function code pointer, field 1 is | |
12324 | // the value on which to invoke the method. | |
12325 | Expression* arg = Expression::make_var_reference(cp, loc); | |
f614ea8b | 12326 | arg = Expression::make_dereference(arg, NIL_CHECK_NOT_NEEDED, loc); |
0afbb937 | 12327 | arg = Expression::make_field_reference(arg, 1, loc); |
12328 | ||
12329 | Expression *ifre = Expression::make_interface_field_reference(arg, name, | |
12330 | loc); | |
12331 | ||
12332 | const Typed_identifier_list* orig_params = orig_fntype->parameters(); | |
12333 | Expression_list* args; | |
12334 | if (orig_params == NULL || orig_params->empty()) | |
12335 | args = NULL; | |
12336 | else | |
12337 | { | |
12338 | const Typed_identifier_list* new_params = new_fntype->parameters(); | |
12339 | args = new Expression_list(); | |
12340 | for (Typed_identifier_list::const_iterator p = new_params->begin(); | |
f8bdf81a | 12341 | p != new_params->end(); |
0afbb937 | 12342 | ++p) |
12343 | { | |
12344 | Named_object* p_no = gogo->lookup(p->name(), NULL); | |
12345 | go_assert(p_no != NULL | |
12346 | && p_no->is_variable() | |
12347 | && p_no->var_value()->is_parameter()); | |
12348 | args->push_back(Expression::make_var_reference(p_no, loc)); | |
12349 | } | |
12350 | } | |
12351 | ||
12352 | Call_expression* call = Expression::make_call(ifre, args, | |
12353 | orig_fntype->is_varargs(), | |
12354 | loc); | |
12355 | call->set_varargs_are_lowered(); | |
12356 | ||
12357 | Statement* s = Statement::make_return_from_call(call, loc); | |
12358 | gogo->add_statement(s); | |
12359 | Block* b = gogo->finish_block(loc); | |
12360 | gogo->add_block(b, loc); | |
12361 | gogo->lower_block(new_no, b); | |
a32698ee | 12362 | gogo->flatten_block(new_no, b); |
0afbb937 | 12363 | gogo->finish_function(loc); |
12364 | ||
12365 | ins.first->second->push_back(std::make_pair(name, new_no)); | |
12366 | return new_no; | |
12367 | } | |
12368 | ||
ea664253 | 12369 | // Get the backend representation for a method value. |
e440a328 | 12370 | |
ea664253 | 12371 | Bexpression* |
12372 | Interface_field_reference_expression::do_get_backend(Translate_context* context) | |
e440a328 | 12373 | { |
0afbb937 | 12374 | Interface_type* type = this->expr_->type()->interface_type(); |
12375 | if (type == NULL) | |
12376 | { | |
12377 | go_assert(saw_errors()); | |
ea664253 | 12378 | return context->backend()->error_expression(); |
0afbb937 | 12379 | } |
12380 | ||
12381 | Named_object* thunk = | |
12382 | Interface_field_reference_expression::create_thunk(context->gogo(), | |
12383 | type, this->name_); | |
12384 | if (thunk->is_erroneous()) | |
12385 | { | |
12386 | go_assert(saw_errors()); | |
ea664253 | 12387 | return context->backend()->error_expression(); |
0afbb937 | 12388 | } |
12389 | ||
12390 | // FIXME: We should lower this earlier, but we can't it lower it in | |
12391 | // the lowering pass because at that point we don't know whether we | |
12392 | // need to create the thunk or not. If the expression is called, we | |
12393 | // don't need the thunk. | |
12394 | ||
12395 | Location loc = this->location(); | |
12396 | ||
12397 | Struct_field_list* fields = new Struct_field_list(); | |
13f2fdb8 | 12398 | fields->push_back(Struct_field(Typed_identifier("fn", |
0afbb937 | 12399 | thunk->func_value()->type(), |
12400 | loc))); | |
13f2fdb8 | 12401 | fields->push_back(Struct_field(Typed_identifier("val", |
0afbb937 | 12402 | this->expr_->type(), |
12403 | loc))); | |
12404 | Struct_type* st = Type::make_struct_type(fields, loc); | |
6bf4793c | 12405 | st->set_is_struct_incomparable(); |
0afbb937 | 12406 | |
12407 | Expression_list* vals = new Expression_list(); | |
12408 | vals->push_back(Expression::make_func_code_reference(thunk, loc)); | |
12409 | vals->push_back(this->expr_); | |
12410 | ||
12411 | Expression* expr = Expression::make_struct_composite_literal(st, vals, loc); | |
ea664253 | 12412 | Bexpression* bclosure = |
12413 | Expression::make_heap_expression(expr, loc)->get_backend(context); | |
0afbb937 | 12414 | |
4df0c2d4 | 12415 | Gogo* gogo = context->gogo(); |
12416 | Btype* btype = this->type()->get_backend(gogo); | |
12417 | bclosure = gogo->backend()->convert_expression(btype, bclosure, loc); | |
12418 | ||
2387f644 | 12419 | Expression* nil_check = |
12420 | Expression::make_binary(OPERATOR_EQEQ, this->expr_, | |
12421 | Expression::make_nil(loc), loc); | |
ea664253 | 12422 | Bexpression* bnil_check = nil_check->get_backend(context); |
0afbb937 | 12423 | |
ea664253 | 12424 | Bexpression* bcrash = gogo->runtime_error(RUNTIME_ERROR_NIL_DEREFERENCE, |
12425 | loc)->get_backend(context); | |
2387f644 | 12426 | |
93715b75 | 12427 | Bfunction* bfn = context->function()->func_value()->get_decl(); |
2387f644 | 12428 | Bexpression* bcond = |
93715b75 | 12429 | gogo->backend()->conditional_expression(bfn, NULL, |
12430 | bnil_check, bcrash, NULL, loc); | |
0ab48656 | 12431 | Bfunction* bfunction = context->function()->func_value()->get_decl(); |
12432 | Bstatement* cond_statement = | |
12433 | gogo->backend()->expression_statement(bfunction, bcond); | |
ea664253 | 12434 | return gogo->backend()->compound_expression(cond_statement, bclosure, loc); |
e440a328 | 12435 | } |
12436 | ||
d751bb78 | 12437 | // Dump ast representation for an interface field reference. |
12438 | ||
12439 | void | |
12440 | Interface_field_reference_expression::do_dump_expression( | |
12441 | Ast_dump_context* ast_dump_context) const | |
12442 | { | |
12443 | this->expr_->dump_expression(ast_dump_context); | |
12444 | ast_dump_context->ostream() << "." << this->name_; | |
12445 | } | |
12446 | ||
e440a328 | 12447 | // Make a reference to a field in an interface. |
12448 | ||
12449 | Expression* | |
12450 | Expression::make_interface_field_reference(Expression* expr, | |
12451 | const std::string& field, | |
b13c66cd | 12452 | Location location) |
e440a328 | 12453 | { |
12454 | return new Interface_field_reference_expression(expr, field, location); | |
12455 | } | |
12456 | ||
12457 | // A general selector. This is a Parser_expression for LEFT.NAME. It | |
12458 | // is lowered after we know the type of the left hand side. | |
12459 | ||
12460 | class Selector_expression : public Parser_expression | |
12461 | { | |
12462 | public: | |
12463 | Selector_expression(Expression* left, const std::string& name, | |
b13c66cd | 12464 | Location location) |
e440a328 | 12465 | : Parser_expression(EXPRESSION_SELECTOR, location), |
12466 | left_(left), name_(name) | |
12467 | { } | |
12468 | ||
12469 | protected: | |
12470 | int | |
12471 | do_traverse(Traverse* traverse) | |
12472 | { return Expression::traverse(&this->left_, traverse); } | |
12473 | ||
12474 | Expression* | |
ceeb4318 | 12475 | do_lower(Gogo*, Named_object*, Statement_inserter*, int); |
e440a328 | 12476 | |
12477 | Expression* | |
12478 | do_copy() | |
12479 | { | |
12480 | return new Selector_expression(this->left_->copy(), this->name_, | |
12481 | this->location()); | |
12482 | } | |
12483 | ||
d751bb78 | 12484 | void |
12485 | do_dump_expression(Ast_dump_context* ast_dump_context) const; | |
12486 | ||
e440a328 | 12487 | private: |
12488 | Expression* | |
12489 | lower_method_expression(Gogo*); | |
12490 | ||
12491 | // The expression on the left hand side. | |
12492 | Expression* left_; | |
12493 | // The name on the right hand side. | |
12494 | std::string name_; | |
12495 | }; | |
12496 | ||
12497 | // Lower a selector expression once we know the real type of the left | |
12498 | // hand side. | |
12499 | ||
12500 | Expression* | |
ceeb4318 | 12501 | Selector_expression::do_lower(Gogo* gogo, Named_object*, Statement_inserter*, |
12502 | int) | |
e440a328 | 12503 | { |
12504 | Expression* left = this->left_; | |
12505 | if (left->is_type_expression()) | |
12506 | return this->lower_method_expression(gogo); | |
12507 | return Type::bind_field_or_method(gogo, left->type(), left, this->name_, | |
12508 | this->location()); | |
12509 | } | |
12510 | ||
12511 | // Lower a method expression T.M or (*T).M. We turn this into a | |
12512 | // function literal. | |
12513 | ||
12514 | Expression* | |
12515 | Selector_expression::lower_method_expression(Gogo* gogo) | |
12516 | { | |
b13c66cd | 12517 | Location location = this->location(); |
868b439e | 12518 | Type* left_type = this->left_->type(); |
12519 | Type* type = left_type; | |
e440a328 | 12520 | const std::string& name(this->name_); |
12521 | ||
12522 | bool is_pointer; | |
12523 | if (type->points_to() == NULL) | |
12524 | is_pointer = false; | |
12525 | else | |
12526 | { | |
12527 | is_pointer = true; | |
12528 | type = type->points_to(); | |
12529 | } | |
12530 | Named_type* nt = type->named_type(); | |
12531 | if (nt == NULL) | |
12532 | { | |
631d5788 | 12533 | go_error_at(location, |
12534 | ("method expression requires named type or " | |
12535 | "pointer to named type")); | |
e440a328 | 12536 | return Expression::make_error(location); |
12537 | } | |
12538 | ||
12539 | bool is_ambiguous; | |
12540 | Method* method = nt->method_function(name, &is_ambiguous); | |
ab1468c3 | 12541 | const Typed_identifier* imethod = NULL; |
dcc8506b | 12542 | if (method == NULL && !is_pointer) |
ab1468c3 | 12543 | { |
12544 | Interface_type* it = nt->interface_type(); | |
12545 | if (it != NULL) | |
12546 | imethod = it->find_method(name); | |
12547 | } | |
12548 | ||
868b439e | 12549 | if ((method == NULL && imethod == NULL) |
12550 | || (left_type->named_type() != NULL && left_type->points_to() != NULL)) | |
e440a328 | 12551 | { |
12552 | if (!is_ambiguous) | |
631d5788 | 12553 | go_error_at(location, "type %<%s%s%> has no method %<%s%>", |
12554 | is_pointer ? "*" : "", | |
12555 | nt->message_name().c_str(), | |
12556 | Gogo::message_name(name).c_str()); | |
e440a328 | 12557 | else |
631d5788 | 12558 | go_error_at(location, "method %<%s%s%> is ambiguous in type %<%s%>", |
12559 | Gogo::message_name(name).c_str(), | |
12560 | is_pointer ? "*" : "", | |
12561 | nt->message_name().c_str()); | |
e440a328 | 12562 | return Expression::make_error(location); |
12563 | } | |
12564 | ||
ab1468c3 | 12565 | if (method != NULL && !is_pointer && !method->is_value_method()) |
e440a328 | 12566 | { |
631d5788 | 12567 | go_error_at(location, "method requires pointer (use %<(*%s).%s%>)", |
12568 | nt->message_name().c_str(), | |
12569 | Gogo::message_name(name).c_str()); | |
e440a328 | 12570 | return Expression::make_error(location); |
12571 | } | |
12572 | ||
12573 | // Build a new function type in which the receiver becomes the first | |
12574 | // argument. | |
ab1468c3 | 12575 | Function_type* method_type; |
12576 | if (method != NULL) | |
12577 | { | |
12578 | method_type = method->type(); | |
c484d925 | 12579 | go_assert(method_type->is_method()); |
ab1468c3 | 12580 | } |
12581 | else | |
12582 | { | |
12583 | method_type = imethod->type()->function_type(); | |
c484d925 | 12584 | go_assert(method_type != NULL && !method_type->is_method()); |
ab1468c3 | 12585 | } |
e440a328 | 12586 | |
12587 | const char* const receiver_name = "$this"; | |
12588 | Typed_identifier_list* parameters = new Typed_identifier_list(); | |
12589 | parameters->push_back(Typed_identifier(receiver_name, this->left_->type(), | |
12590 | location)); | |
12591 | ||
12592 | const Typed_identifier_list* method_parameters = method_type->parameters(); | |
12593 | if (method_parameters != NULL) | |
12594 | { | |
f470da59 | 12595 | int i = 0; |
e440a328 | 12596 | for (Typed_identifier_list::const_iterator p = method_parameters->begin(); |
12597 | p != method_parameters->end(); | |
f470da59 | 12598 | ++p, ++i) |
12599 | { | |
68883531 | 12600 | if (!p->name().empty()) |
f470da59 | 12601 | parameters->push_back(*p); |
12602 | else | |
12603 | { | |
12604 | char buf[20]; | |
12605 | snprintf(buf, sizeof buf, "$param%d", i); | |
12606 | parameters->push_back(Typed_identifier(buf, p->type(), | |
12607 | p->location())); | |
12608 | } | |
12609 | } | |
e440a328 | 12610 | } |
12611 | ||
12612 | const Typed_identifier_list* method_results = method_type->results(); | |
12613 | Typed_identifier_list* results; | |
12614 | if (method_results == NULL) | |
12615 | results = NULL; | |
12616 | else | |
12617 | { | |
12618 | results = new Typed_identifier_list(); | |
12619 | for (Typed_identifier_list::const_iterator p = method_results->begin(); | |
12620 | p != method_results->end(); | |
12621 | ++p) | |
12622 | results->push_back(*p); | |
12623 | } | |
12624 | ||
12625 | Function_type* fntype = Type::make_function_type(NULL, parameters, results, | |
12626 | location); | |
12627 | if (method_type->is_varargs()) | |
12628 | fntype->set_is_varargs(); | |
12629 | ||
12630 | // We generate methods which always takes a pointer to the receiver | |
12631 | // as their first argument. If this is for a pointer type, we can | |
12632 | // simply reuse the existing function. We use an internal hack to | |
12633 | // get the right type. | |
8381eda7 | 12634 | // FIXME: This optimization is disabled because it doesn't yet work |
12635 | // with function descriptors when the method expression is not | |
12636 | // directly called. | |
12637 | if (method != NULL && is_pointer && false) | |
e440a328 | 12638 | { |
12639 | Named_object* mno = (method->needs_stub_method() | |
12640 | ? method->stub_object() | |
12641 | : method->named_object()); | |
12642 | Expression* f = Expression::make_func_reference(mno, NULL, location); | |
12643 | f = Expression::make_cast(fntype, f, location); | |
12644 | Type_conversion_expression* tce = | |
12645 | static_cast<Type_conversion_expression*>(f); | |
12646 | tce->set_may_convert_function_types(); | |
12647 | return f; | |
12648 | } | |
12649 | ||
13f2fdb8 | 12650 | Named_object* no = gogo->start_function(gogo->thunk_name(), fntype, false, |
e440a328 | 12651 | location); |
12652 | ||
12653 | Named_object* vno = gogo->lookup(receiver_name, NULL); | |
c484d925 | 12654 | go_assert(vno != NULL); |
e440a328 | 12655 | Expression* ve = Expression::make_var_reference(vno, location); |
ab1468c3 | 12656 | Expression* bm; |
12657 | if (method != NULL) | |
12658 | bm = Type::bind_field_or_method(gogo, nt, ve, name, location); | |
12659 | else | |
12660 | bm = Expression::make_interface_field_reference(ve, name, location); | |
f690b0bb | 12661 | |
12662 | // Even though we found the method above, if it has an error type we | |
12663 | // may see an error here. | |
12664 | if (bm->is_error_expression()) | |
463fe805 | 12665 | { |
12666 | gogo->finish_function(location); | |
12667 | return bm; | |
12668 | } | |
e440a328 | 12669 | |
12670 | Expression_list* args; | |
f470da59 | 12671 | if (parameters->size() <= 1) |
e440a328 | 12672 | args = NULL; |
12673 | else | |
12674 | { | |
12675 | args = new Expression_list(); | |
f470da59 | 12676 | Typed_identifier_list::const_iterator p = parameters->begin(); |
12677 | ++p; | |
12678 | for (; p != parameters->end(); ++p) | |
e440a328 | 12679 | { |
12680 | vno = gogo->lookup(p->name(), NULL); | |
c484d925 | 12681 | go_assert(vno != NULL); |
e440a328 | 12682 | args->push_back(Expression::make_var_reference(vno, location)); |
12683 | } | |
12684 | } | |
12685 | ||
ceeb4318 | 12686 | gogo->start_block(location); |
12687 | ||
e440a328 | 12688 | Call_expression* call = Expression::make_call(bm, args, |
12689 | method_type->is_varargs(), | |
12690 | location); | |
12691 | ||
0afbb937 | 12692 | Statement* s = Statement::make_return_from_call(call, location); |
e440a328 | 12693 | gogo->add_statement(s); |
12694 | ||
ceeb4318 | 12695 | Block* b = gogo->finish_block(location); |
12696 | ||
12697 | gogo->add_block(b, location); | |
12698 | ||
12699 | // Lower the call in case there are multiple results. | |
12700 | gogo->lower_block(no, b); | |
a32698ee | 12701 | gogo->flatten_block(no, b); |
ceeb4318 | 12702 | |
e440a328 | 12703 | gogo->finish_function(location); |
12704 | ||
12705 | return Expression::make_func_reference(no, NULL, location); | |
12706 | } | |
12707 | ||
d751bb78 | 12708 | // Dump the ast for a selector expression. |
12709 | ||
12710 | void | |
12711 | Selector_expression::do_dump_expression(Ast_dump_context* ast_dump_context) | |
12712 | const | |
12713 | { | |
12714 | ast_dump_context->dump_expression(this->left_); | |
12715 | ast_dump_context->ostream() << "."; | |
12716 | ast_dump_context->ostream() << this->name_; | |
12717 | } | |
12718 | ||
e440a328 | 12719 | // Make a selector expression. |
12720 | ||
12721 | Expression* | |
12722 | Expression::make_selector(Expression* left, const std::string& name, | |
b13c66cd | 12723 | Location location) |
e440a328 | 12724 | { |
12725 | return new Selector_expression(left, name, location); | |
12726 | } | |
12727 | ||
da244e59 | 12728 | // Class Allocation_expression. |
e440a328 | 12729 | |
da244e59 | 12730 | int |
12731 | Allocation_expression::do_traverse(Traverse* traverse) | |
e440a328 | 12732 | { |
da244e59 | 12733 | return Type::traverse(this->type_, traverse); |
12734 | } | |
e440a328 | 12735 | |
da244e59 | 12736 | Type* |
12737 | Allocation_expression::do_type() | |
12738 | { | |
12739 | return Type::make_pointer_type(this->type_); | |
12740 | } | |
e440a328 | 12741 | |
22deed0d | 12742 | void |
12743 | Allocation_expression::do_check_types(Gogo*) | |
12744 | { | |
12745 | if (!this->type_->in_heap()) | |
12746 | go_error_at(this->location(), "can't heap allocate go:notinheap type"); | |
12747 | } | |
12748 | ||
da244e59 | 12749 | // Make a copy of an allocation expression. |
e440a328 | 12750 | |
da244e59 | 12751 | Expression* |
12752 | Allocation_expression::do_copy() | |
12753 | { | |
12754 | Allocation_expression* alloc = | |
de590a61 | 12755 | new Allocation_expression(this->type_->copy_expressions(), |
12756 | this->location()); | |
da244e59 | 12757 | if (this->allocate_on_stack_) |
12758 | alloc->set_allocate_on_stack(); | |
12759 | return alloc; | |
12760 | } | |
e440a328 | 12761 | |
ea664253 | 12762 | // Return the backend representation for an allocation expression. |
e440a328 | 12763 | |
ea664253 | 12764 | Bexpression* |
12765 | Allocation_expression::do_get_backend(Translate_context* context) | |
e440a328 | 12766 | { |
2c809f8f | 12767 | Gogo* gogo = context->gogo(); |
12768 | Location loc = this->location(); | |
06e83d10 | 12769 | Btype* btype = this->type_->get_backend(gogo); |
da244e59 | 12770 | |
5973ede0 | 12771 | if (this->allocate_on_stack_) |
da244e59 | 12772 | { |
2a305b85 | 12773 | int64_t size; |
12774 | bool ok = this->type_->backend_type_size(gogo, &size); | |
12775 | if (!ok) | |
12776 | { | |
12777 | go_assert(saw_errors()); | |
12778 | return gogo->backend()->error_expression(); | |
12779 | } | |
06e83d10 | 12780 | Bstatement* decl; |
12781 | Named_object* fn = context->function(); | |
12782 | go_assert(fn != NULL); | |
12783 | Bfunction* fndecl = fn->func_value()->get_or_make_decl(gogo, fn); | |
12784 | Bexpression* zero = gogo->backend()->zero_expression(btype); | |
12785 | Bvariable* temp = | |
12786 | gogo->backend()->temporary_variable(fndecl, context->bblock(), btype, | |
12787 | zero, true, loc, &decl); | |
12788 | Bexpression* ret = gogo->backend()->var_expression(temp, loc); | |
12789 | ret = gogo->backend()->address_expression(ret, loc); | |
12790 | ret = gogo->backend()->compound_expression(decl, ret, loc); | |
12791 | return ret; | |
da244e59 | 12792 | } |
12793 | ||
2a305b85 | 12794 | Bexpression* space = |
ea664253 | 12795 | gogo->allocate_memory(this->type_, loc)->get_backend(context); |
d5d1c295 | 12796 | Btype* pbtype = gogo->backend()->pointer_type(btype); |
ea664253 | 12797 | return gogo->backend()->convert_expression(pbtype, space, loc); |
e440a328 | 12798 | } |
12799 | ||
d751bb78 | 12800 | // Dump ast representation for an allocation expression. |
12801 | ||
12802 | void | |
12803 | Allocation_expression::do_dump_expression(Ast_dump_context* ast_dump_context) | |
12804 | const | |
12805 | { | |
12806 | ast_dump_context->ostream() << "new("; | |
12807 | ast_dump_context->dump_type(this->type_); | |
12808 | ast_dump_context->ostream() << ")"; | |
12809 | } | |
12810 | ||
e440a328 | 12811 | // Make an allocation expression. |
12812 | ||
12813 | Expression* | |
b13c66cd | 12814 | Expression::make_allocation(Type* type, Location location) |
e440a328 | 12815 | { |
12816 | return new Allocation_expression(type, location); | |
12817 | } | |
12818 | ||
e32de7ba | 12819 | // Class Ordered_value_list. |
e440a328 | 12820 | |
12821 | int | |
e32de7ba | 12822 | Ordered_value_list::traverse_vals(Traverse* traverse) |
e440a328 | 12823 | { |
0c4f5a19 | 12824 | if (this->vals_ != NULL) |
12825 | { | |
12826 | if (this->traverse_order_ == NULL) | |
12827 | { | |
12828 | if (this->vals_->traverse(traverse) == TRAVERSE_EXIT) | |
12829 | return TRAVERSE_EXIT; | |
12830 | } | |
12831 | else | |
12832 | { | |
e32de7ba | 12833 | for (std::vector<unsigned long>::const_iterator p = |
12834 | this->traverse_order_->begin(); | |
0c4f5a19 | 12835 | p != this->traverse_order_->end(); |
12836 | ++p) | |
12837 | { | |
12838 | if (Expression::traverse(&this->vals_->at(*p), traverse) | |
12839 | == TRAVERSE_EXIT) | |
12840 | return TRAVERSE_EXIT; | |
12841 | } | |
12842 | } | |
12843 | } | |
e32de7ba | 12844 | return TRAVERSE_CONTINUE; |
12845 | } | |
12846 | ||
12847 | // Class Struct_construction_expression. | |
12848 | ||
12849 | // Traversal. | |
12850 | ||
12851 | int | |
12852 | Struct_construction_expression::do_traverse(Traverse* traverse) | |
12853 | { | |
12854 | if (this->traverse_vals(traverse) == TRAVERSE_EXIT) | |
12855 | return TRAVERSE_EXIT; | |
e440a328 | 12856 | if (Type::traverse(this->type_, traverse) == TRAVERSE_EXIT) |
12857 | return TRAVERSE_EXIT; | |
12858 | return TRAVERSE_CONTINUE; | |
12859 | } | |
12860 | ||
12861 | // Return whether this is a constant initializer. | |
12862 | ||
12863 | bool | |
12864 | Struct_construction_expression::is_constant_struct() const | |
12865 | { | |
e32de7ba | 12866 | if (this->vals() == NULL) |
e440a328 | 12867 | return true; |
e32de7ba | 12868 | for (Expression_list::const_iterator pv = this->vals()->begin(); |
12869 | pv != this->vals()->end(); | |
e440a328 | 12870 | ++pv) |
12871 | { | |
12872 | if (*pv != NULL | |
12873 | && !(*pv)->is_constant() | |
12874 | && (!(*pv)->is_composite_literal() | |
12875 | || (*pv)->is_nonconstant_composite_literal())) | |
12876 | return false; | |
12877 | } | |
12878 | ||
12879 | const Struct_field_list* fields = this->type_->struct_type()->fields(); | |
12880 | for (Struct_field_list::const_iterator pf = fields->begin(); | |
12881 | pf != fields->end(); | |
12882 | ++pf) | |
12883 | { | |
12884 | // There are no constant constructors for interfaces. | |
12885 | if (pf->type()->interface_type() != NULL) | |
12886 | return false; | |
12887 | } | |
12888 | ||
12889 | return true; | |
12890 | } | |
12891 | ||
3ae06f68 | 12892 | // Return whether this struct can be used as a constant initializer. |
f9ca30f9 | 12893 | |
12894 | bool | |
3ae06f68 | 12895 | Struct_construction_expression::do_is_static_initializer() const |
f9ca30f9 | 12896 | { |
e32de7ba | 12897 | if (this->vals() == NULL) |
f9ca30f9 | 12898 | return true; |
e32de7ba | 12899 | for (Expression_list::const_iterator pv = this->vals()->begin(); |
12900 | pv != this->vals()->end(); | |
f9ca30f9 | 12901 | ++pv) |
12902 | { | |
3ae06f68 | 12903 | if (*pv != NULL && !(*pv)->is_static_initializer()) |
f9ca30f9 | 12904 | return false; |
12905 | } | |
de048538 | 12906 | |
12907 | const Struct_field_list* fields = this->type_->struct_type()->fields(); | |
12908 | for (Struct_field_list::const_iterator pf = fields->begin(); | |
12909 | pf != fields->end(); | |
12910 | ++pf) | |
12911 | { | |
12912 | // There are no constant constructors for interfaces. | |
12913 | if (pf->type()->interface_type() != NULL) | |
12914 | return false; | |
12915 | } | |
12916 | ||
f9ca30f9 | 12917 | return true; |
12918 | } | |
12919 | ||
e440a328 | 12920 | // Final type determination. |
12921 | ||
12922 | void | |
12923 | Struct_construction_expression::do_determine_type(const Type_context*) | |
12924 | { | |
e32de7ba | 12925 | if (this->vals() == NULL) |
e440a328 | 12926 | return; |
12927 | const Struct_field_list* fields = this->type_->struct_type()->fields(); | |
e32de7ba | 12928 | Expression_list::const_iterator pv = this->vals()->begin(); |
e440a328 | 12929 | for (Struct_field_list::const_iterator pf = fields->begin(); |
12930 | pf != fields->end(); | |
12931 | ++pf, ++pv) | |
12932 | { | |
e32de7ba | 12933 | if (pv == this->vals()->end()) |
e440a328 | 12934 | return; |
12935 | if (*pv != NULL) | |
12936 | { | |
12937 | Type_context subcontext(pf->type(), false); | |
12938 | (*pv)->determine_type(&subcontext); | |
12939 | } | |
12940 | } | |
a6cb4c0e | 12941 | // Extra values are an error we will report elsewhere; we still want |
12942 | // to determine the type to avoid knockon errors. | |
e32de7ba | 12943 | for (; pv != this->vals()->end(); ++pv) |
a6cb4c0e | 12944 | (*pv)->determine_type_no_context(); |
e440a328 | 12945 | } |
12946 | ||
12947 | // Check types. | |
12948 | ||
12949 | void | |
12950 | Struct_construction_expression::do_check_types(Gogo*) | |
12951 | { | |
e32de7ba | 12952 | if (this->vals() == NULL) |
e440a328 | 12953 | return; |
12954 | ||
12955 | Struct_type* st = this->type_->struct_type(); | |
e32de7ba | 12956 | if (this->vals()->size() > st->field_count()) |
e440a328 | 12957 | { |
12958 | this->report_error(_("too many expressions for struct")); | |
12959 | return; | |
12960 | } | |
12961 | ||
12962 | const Struct_field_list* fields = st->fields(); | |
e32de7ba | 12963 | Expression_list::const_iterator pv = this->vals()->begin(); |
e440a328 | 12964 | int i = 0; |
12965 | for (Struct_field_list::const_iterator pf = fields->begin(); | |
12966 | pf != fields->end(); | |
12967 | ++pf, ++pv, ++i) | |
12968 | { | |
e32de7ba | 12969 | if (pv == this->vals()->end()) |
e440a328 | 12970 | { |
12971 | this->report_error(_("too few expressions for struct")); | |
12972 | break; | |
12973 | } | |
12974 | ||
12975 | if (*pv == NULL) | |
12976 | continue; | |
12977 | ||
12978 | std::string reason; | |
12979 | if (!Type::are_assignable(pf->type(), (*pv)->type(), &reason)) | |
12980 | { | |
12981 | if (reason.empty()) | |
631d5788 | 12982 | go_error_at((*pv)->location(), |
12983 | "incompatible type for field %d in struct construction", | |
12984 | i + 1); | |
e440a328 | 12985 | else |
631d5788 | 12986 | go_error_at((*pv)->location(), |
12987 | ("incompatible type for field %d in " | |
12988 | "struct construction (%s)"), | |
12989 | i + 1, reason.c_str()); | |
e440a328 | 12990 | this->set_is_error(); |
12991 | } | |
12992 | } | |
e32de7ba | 12993 | go_assert(pv == this->vals()->end()); |
e440a328 | 12994 | } |
12995 | ||
de590a61 | 12996 | // Copy. |
12997 | ||
12998 | Expression* | |
12999 | Struct_construction_expression::do_copy() | |
13000 | { | |
13001 | Struct_construction_expression* ret = | |
13002 | new Struct_construction_expression(this->type_->copy_expressions(), | |
13003 | (this->vals() == NULL | |
13004 | ? NULL | |
13005 | : this->vals()->copy()), | |
13006 | this->location()); | |
13007 | if (this->traverse_order() != NULL) | |
13008 | ret->set_traverse_order(this->traverse_order()); | |
13009 | return ret; | |
13010 | } | |
13011 | ||
8ba8cc87 | 13012 | // Flatten a struct construction expression. Store the values into |
13013 | // temporaries in case they need interface conversion. | |
13014 | ||
13015 | Expression* | |
13016 | Struct_construction_expression::do_flatten(Gogo*, Named_object*, | |
13017 | Statement_inserter* inserter) | |
13018 | { | |
e32de7ba | 13019 | if (this->vals() == NULL) |
8ba8cc87 | 13020 | return this; |
13021 | ||
13022 | // If this is a constant struct, we don't need temporaries. | |
de048538 | 13023 | if (this->is_constant_struct() || this->is_static_initializer()) |
8ba8cc87 | 13024 | return this; |
13025 | ||
13026 | Location loc = this->location(); | |
e32de7ba | 13027 | for (Expression_list::iterator pv = this->vals()->begin(); |
13028 | pv != this->vals()->end(); | |
8ba8cc87 | 13029 | ++pv) |
13030 | { | |
13031 | if (*pv != NULL) | |
13032 | { | |
5bf8be8b | 13033 | if ((*pv)->is_error_expression() || (*pv)->type()->is_error_type()) |
13034 | { | |
13035 | go_assert(saw_errors()); | |
13036 | return Expression::make_error(loc); | |
13037 | } | |
8ba8cc87 | 13038 | if (!(*pv)->is_variable()) |
13039 | { | |
13040 | Temporary_statement* temp = | |
13041 | Statement::make_temporary(NULL, *pv, loc); | |
13042 | inserter->insert(temp); | |
13043 | *pv = Expression::make_temporary_reference(temp, loc); | |
13044 | } | |
13045 | } | |
13046 | } | |
13047 | return this; | |
13048 | } | |
13049 | ||
ea664253 | 13050 | // Return the backend representation for constructing a struct. |
e440a328 | 13051 | |
ea664253 | 13052 | Bexpression* |
13053 | Struct_construction_expression::do_get_backend(Translate_context* context) | |
e440a328 | 13054 | { |
13055 | Gogo* gogo = context->gogo(); | |
13056 | ||
2c809f8f | 13057 | Btype* btype = this->type_->get_backend(gogo); |
e32de7ba | 13058 | if (this->vals() == NULL) |
ea664253 | 13059 | return gogo->backend()->zero_expression(btype); |
e440a328 | 13060 | |
e440a328 | 13061 | const Struct_field_list* fields = this->type_->struct_type()->fields(); |
e32de7ba | 13062 | Expression_list::const_iterator pv = this->vals()->begin(); |
2c809f8f | 13063 | std::vector<Bexpression*> init; |
13064 | for (Struct_field_list::const_iterator pf = fields->begin(); | |
13065 | pf != fields->end(); | |
13066 | ++pf) | |
e440a328 | 13067 | { |
63697958 | 13068 | Btype* fbtype = pf->type()->get_backend(gogo); |
e32de7ba | 13069 | if (pv == this->vals()->end()) |
2c809f8f | 13070 | init.push_back(gogo->backend()->zero_expression(fbtype)); |
e440a328 | 13071 | else if (*pv == NULL) |
13072 | { | |
2c809f8f | 13073 | init.push_back(gogo->backend()->zero_expression(fbtype)); |
e440a328 | 13074 | ++pv; |
13075 | } | |
13076 | else | |
13077 | { | |
2c809f8f | 13078 | Expression* val = |
13079 | Expression::convert_for_assignment(gogo, pf->type(), | |
13080 | *pv, this->location()); | |
ea664253 | 13081 | init.push_back(val->get_backend(context)); |
e440a328 | 13082 | ++pv; |
13083 | } | |
e440a328 | 13084 | } |
0fdf8340 | 13085 | if (this->type_->struct_type()->has_padding()) |
13086 | { | |
13087 | // Feed an extra value if there is a padding field. | |
13088 | Btype *fbtype = Type::lookup_integer_type("uint8")->get_backend(gogo); | |
13089 | init.push_back(gogo->backend()->zero_expression(fbtype)); | |
13090 | } | |
ea664253 | 13091 | return gogo->backend()->constructor_expression(btype, init, this->location()); |
e440a328 | 13092 | } |
13093 | ||
13094 | // Export a struct construction. | |
13095 | ||
13096 | void | |
548be246 | 13097 | Struct_construction_expression::do_export(Export_function_body* efb) const |
e440a328 | 13098 | { |
204d4af4 | 13099 | efb->write_c_string("$convert("); |
548be246 | 13100 | efb->write_type(this->type_); |
e32de7ba | 13101 | for (Expression_list::const_iterator pv = this->vals()->begin(); |
13102 | pv != this->vals()->end(); | |
e440a328 | 13103 | ++pv) |
13104 | { | |
548be246 | 13105 | efb->write_c_string(", "); |
e440a328 | 13106 | if (*pv != NULL) |
548be246 | 13107 | (*pv)->export_expression(efb); |
e440a328 | 13108 | } |
548be246 | 13109 | efb->write_c_string(")"); |
e440a328 | 13110 | } |
13111 | ||
d751bb78 | 13112 | // Dump ast representation of a struct construction expression. |
13113 | ||
13114 | void | |
13115 | Struct_construction_expression::do_dump_expression( | |
13116 | Ast_dump_context* ast_dump_context) const | |
13117 | { | |
d751bb78 | 13118 | ast_dump_context->dump_type(this->type_); |
13119 | ast_dump_context->ostream() << "{"; | |
e32de7ba | 13120 | ast_dump_context->dump_expression_list(this->vals()); |
d751bb78 | 13121 | ast_dump_context->ostream() << "}"; |
13122 | } | |
13123 | ||
e440a328 | 13124 | // Make a struct composite literal. This used by the thunk code. |
13125 | ||
13126 | Expression* | |
13127 | Expression::make_struct_composite_literal(Type* type, Expression_list* vals, | |
b13c66cd | 13128 | Location location) |
e440a328 | 13129 | { |
c484d925 | 13130 | go_assert(type->struct_type() != NULL); |
e440a328 | 13131 | return new Struct_construction_expression(type, vals, location); |
13132 | } | |
13133 | ||
da244e59 | 13134 | // Class Array_construction_expression. |
e440a328 | 13135 | |
13136 | // Traversal. | |
13137 | ||
13138 | int | |
13139 | Array_construction_expression::do_traverse(Traverse* traverse) | |
13140 | { | |
e32de7ba | 13141 | if (this->traverse_vals(traverse) == TRAVERSE_EXIT) |
e440a328 | 13142 | return TRAVERSE_EXIT; |
13143 | if (Type::traverse(this->type_, traverse) == TRAVERSE_EXIT) | |
13144 | return TRAVERSE_EXIT; | |
13145 | return TRAVERSE_CONTINUE; | |
13146 | } | |
13147 | ||
13148 | // Return whether this is a constant initializer. | |
13149 | ||
13150 | bool | |
13151 | Array_construction_expression::is_constant_array() const | |
13152 | { | |
e32de7ba | 13153 | if (this->vals() == NULL) |
e440a328 | 13154 | return true; |
13155 | ||
13156 | // There are no constant constructors for interfaces. | |
13157 | if (this->type_->array_type()->element_type()->interface_type() != NULL) | |
13158 | return false; | |
13159 | ||
e32de7ba | 13160 | for (Expression_list::const_iterator pv = this->vals()->begin(); |
13161 | pv != this->vals()->end(); | |
e440a328 | 13162 | ++pv) |
13163 | { | |
13164 | if (*pv != NULL | |
13165 | && !(*pv)->is_constant() | |
13166 | && (!(*pv)->is_composite_literal() | |
13167 | || (*pv)->is_nonconstant_composite_literal())) | |
13168 | return false; | |
13169 | } | |
13170 | return true; | |
13171 | } | |
13172 | ||
3ae06f68 | 13173 | // Return whether this can be used a constant initializer. |
f9ca30f9 | 13174 | |
13175 | bool | |
3ae06f68 | 13176 | Array_construction_expression::do_is_static_initializer() const |
f9ca30f9 | 13177 | { |
e32de7ba | 13178 | if (this->vals() == NULL) |
f9ca30f9 | 13179 | return true; |
de048538 | 13180 | |
13181 | // There are no constant constructors for interfaces. | |
13182 | if (this->type_->array_type()->element_type()->interface_type() != NULL) | |
13183 | return false; | |
13184 | ||
e32de7ba | 13185 | for (Expression_list::const_iterator pv = this->vals()->begin(); |
13186 | pv != this->vals()->end(); | |
f9ca30f9 | 13187 | ++pv) |
13188 | { | |
3ae06f68 | 13189 | if (*pv != NULL && !(*pv)->is_static_initializer()) |
f9ca30f9 | 13190 | return false; |
13191 | } | |
13192 | return true; | |
13193 | } | |
13194 | ||
e440a328 | 13195 | // Final type determination. |
13196 | ||
13197 | void | |
13198 | Array_construction_expression::do_determine_type(const Type_context*) | |
13199 | { | |
e32de7ba | 13200 | if (this->vals() == NULL) |
e440a328 | 13201 | return; |
13202 | Type_context subcontext(this->type_->array_type()->element_type(), false); | |
e32de7ba | 13203 | for (Expression_list::const_iterator pv = this->vals()->begin(); |
13204 | pv != this->vals()->end(); | |
e440a328 | 13205 | ++pv) |
13206 | { | |
13207 | if (*pv != NULL) | |
13208 | (*pv)->determine_type(&subcontext); | |
13209 | } | |
13210 | } | |
13211 | ||
13212 | // Check types. | |
13213 | ||
13214 | void | |
13215 | Array_construction_expression::do_check_types(Gogo*) | |
13216 | { | |
e32de7ba | 13217 | if (this->vals() == NULL) |
e440a328 | 13218 | return; |
13219 | ||
13220 | Array_type* at = this->type_->array_type(); | |
13221 | int i = 0; | |
13222 | Type* element_type = at->element_type(); | |
e32de7ba | 13223 | for (Expression_list::const_iterator pv = this->vals()->begin(); |
13224 | pv != this->vals()->end(); | |
e440a328 | 13225 | ++pv, ++i) |
13226 | { | |
13227 | if (*pv != NULL | |
13228 | && !Type::are_assignable(element_type, (*pv)->type(), NULL)) | |
13229 | { | |
631d5788 | 13230 | go_error_at((*pv)->location(), |
13231 | "incompatible type for element %d in composite literal", | |
13232 | i + 1); | |
e440a328 | 13233 | this->set_is_error(); |
13234 | } | |
13235 | } | |
e440a328 | 13236 | } |
13237 | ||
8ba8cc87 | 13238 | // Flatten an array construction expression. Store the values into |
13239 | // temporaries in case they need interface conversion. | |
13240 | ||
13241 | Expression* | |
13242 | Array_construction_expression::do_flatten(Gogo*, Named_object*, | |
13243 | Statement_inserter* inserter) | |
13244 | { | |
e32de7ba | 13245 | if (this->vals() == NULL) |
8ba8cc87 | 13246 | return this; |
13247 | ||
13248 | // If this is a constant array, we don't need temporaries. | |
de048538 | 13249 | if (this->is_constant_array() || this->is_static_initializer()) |
8ba8cc87 | 13250 | return this; |
13251 | ||
13252 | Location loc = this->location(); | |
e32de7ba | 13253 | for (Expression_list::iterator pv = this->vals()->begin(); |
13254 | pv != this->vals()->end(); | |
8ba8cc87 | 13255 | ++pv) |
13256 | { | |
13257 | if (*pv != NULL) | |
13258 | { | |
5bf8be8b | 13259 | if ((*pv)->is_error_expression() || (*pv)->type()->is_error_type()) |
13260 | { | |
13261 | go_assert(saw_errors()); | |
13262 | return Expression::make_error(loc); | |
13263 | } | |
8ba8cc87 | 13264 | if (!(*pv)->is_variable()) |
13265 | { | |
13266 | Temporary_statement* temp = | |
13267 | Statement::make_temporary(NULL, *pv, loc); | |
13268 | inserter->insert(temp); | |
13269 | *pv = Expression::make_temporary_reference(temp, loc); | |
13270 | } | |
13271 | } | |
13272 | } | |
13273 | return this; | |
13274 | } | |
13275 | ||
2c809f8f | 13276 | // Get a constructor expression for the array values. |
e440a328 | 13277 | |
2c809f8f | 13278 | Bexpression* |
13279 | Array_construction_expression::get_constructor(Translate_context* context, | |
13280 | Btype* array_btype) | |
e440a328 | 13281 | { |
e440a328 | 13282 | Type* element_type = this->type_->array_type()->element_type(); |
2c809f8f | 13283 | |
13284 | std::vector<unsigned long> indexes; | |
13285 | std::vector<Bexpression*> vals; | |
13286 | Gogo* gogo = context->gogo(); | |
e32de7ba | 13287 | if (this->vals() != NULL) |
e440a328 | 13288 | { |
13289 | size_t i = 0; | |
ffe743ca | 13290 | std::vector<unsigned long>::const_iterator pi; |
13291 | if (this->indexes_ != NULL) | |
13292 | pi = this->indexes_->begin(); | |
e32de7ba | 13293 | for (Expression_list::const_iterator pv = this->vals()->begin(); |
13294 | pv != this->vals()->end(); | |
e440a328 | 13295 | ++pv, ++i) |
13296 | { | |
ffe743ca | 13297 | if (this->indexes_ != NULL) |
13298 | go_assert(pi != this->indexes_->end()); | |
ffe743ca | 13299 | |
13300 | if (this->indexes_ == NULL) | |
2c809f8f | 13301 | indexes.push_back(i); |
ffe743ca | 13302 | else |
2c809f8f | 13303 | indexes.push_back(*pi); |
e440a328 | 13304 | if (*pv == NULL) |
63697958 | 13305 | { |
63697958 | 13306 | Btype* ebtype = element_type->get_backend(gogo); |
13307 | Bexpression *zv = gogo->backend()->zero_expression(ebtype); | |
2c809f8f | 13308 | vals.push_back(zv); |
63697958 | 13309 | } |
e440a328 | 13310 | else |
13311 | { | |
2c809f8f | 13312 | Expression* val_expr = |
13313 | Expression::convert_for_assignment(gogo, element_type, *pv, | |
13314 | this->location()); | |
ea664253 | 13315 | vals.push_back(val_expr->get_backend(context)); |
e440a328 | 13316 | } |
ffe743ca | 13317 | if (this->indexes_ != NULL) |
13318 | ++pi; | |
e440a328 | 13319 | } |
ffe743ca | 13320 | if (this->indexes_ != NULL) |
13321 | go_assert(pi == this->indexes_->end()); | |
e440a328 | 13322 | } |
2c809f8f | 13323 | return gogo->backend()->array_constructor_expression(array_btype, indexes, |
13324 | vals, this->location()); | |
e440a328 | 13325 | } |
13326 | ||
13327 | // Export an array construction. | |
13328 | ||
13329 | void | |
548be246 | 13330 | Array_construction_expression::do_export(Export_function_body* efb) const |
e440a328 | 13331 | { |
204d4af4 | 13332 | efb->write_c_string("$convert("); |
548be246 | 13333 | efb->write_type(this->type_); |
e32de7ba | 13334 | if (this->vals() != NULL) |
e440a328 | 13335 | { |
ffe743ca | 13336 | std::vector<unsigned long>::const_iterator pi; |
13337 | if (this->indexes_ != NULL) | |
13338 | pi = this->indexes_->begin(); | |
e32de7ba | 13339 | for (Expression_list::const_iterator pv = this->vals()->begin(); |
13340 | pv != this->vals()->end(); | |
e440a328 | 13341 | ++pv) |
13342 | { | |
548be246 | 13343 | efb->write_c_string(", "); |
ffe743ca | 13344 | |
13345 | if (this->indexes_ != NULL) | |
13346 | { | |
13347 | char buf[100]; | |
13348 | snprintf(buf, sizeof buf, "%lu", *pi); | |
548be246 | 13349 | efb->write_c_string(buf); |
13350 | efb->write_c_string(":"); | |
ffe743ca | 13351 | } |
13352 | ||
e440a328 | 13353 | if (*pv != NULL) |
548be246 | 13354 | (*pv)->export_expression(efb); |
ffe743ca | 13355 | |
13356 | if (this->indexes_ != NULL) | |
13357 | ++pi; | |
e440a328 | 13358 | } |
13359 | } | |
548be246 | 13360 | efb->write_c_string(")"); |
e440a328 | 13361 | } |
13362 | ||
0e9a2e72 | 13363 | // Dump ast representation of an array construction expression. |
d751bb78 | 13364 | |
13365 | void | |
13366 | Array_construction_expression::do_dump_expression( | |
13367 | Ast_dump_context* ast_dump_context) const | |
13368 | { | |
ffe743ca | 13369 | Expression* length = this->type_->array_type()->length(); |
8b1c301d | 13370 | |
13371 | ast_dump_context->ostream() << "[" ; | |
13372 | if (length != NULL) | |
13373 | { | |
13374 | ast_dump_context->dump_expression(length); | |
13375 | } | |
13376 | ast_dump_context->ostream() << "]" ; | |
d751bb78 | 13377 | ast_dump_context->dump_type(this->type_); |
0e9a2e72 | 13378 | this->dump_slice_storage_expression(ast_dump_context); |
d751bb78 | 13379 | ast_dump_context->ostream() << "{" ; |
ffe743ca | 13380 | if (this->indexes_ == NULL) |
e32de7ba | 13381 | ast_dump_context->dump_expression_list(this->vals()); |
ffe743ca | 13382 | else |
13383 | { | |
e32de7ba | 13384 | Expression_list::const_iterator pv = this->vals()->begin(); |
ffe743ca | 13385 | for (std::vector<unsigned long>::const_iterator pi = |
13386 | this->indexes_->begin(); | |
13387 | pi != this->indexes_->end(); | |
13388 | ++pi, ++pv) | |
13389 | { | |
13390 | if (pi != this->indexes_->begin()) | |
13391 | ast_dump_context->ostream() << ", "; | |
13392 | ast_dump_context->ostream() << *pi << ':'; | |
13393 | ast_dump_context->dump_expression(*pv); | |
13394 | } | |
13395 | } | |
d751bb78 | 13396 | ast_dump_context->ostream() << "}" ; |
13397 | ||
13398 | } | |
13399 | ||
da244e59 | 13400 | // Class Fixed_array_construction_expression. |
e440a328 | 13401 | |
da244e59 | 13402 | Fixed_array_construction_expression::Fixed_array_construction_expression( |
13403 | Type* type, const std::vector<unsigned long>* indexes, | |
13404 | Expression_list* vals, Location location) | |
13405 | : Array_construction_expression(EXPRESSION_FIXED_ARRAY_CONSTRUCTION, | |
13406 | type, indexes, vals, location) | |
13407 | { go_assert(type->array_type() != NULL && !type->is_slice_type()); } | |
e440a328 | 13408 | |
de590a61 | 13409 | |
13410 | // Copy. | |
13411 | ||
13412 | Expression* | |
13413 | Fixed_array_construction_expression::do_copy() | |
13414 | { | |
13415 | Type* t = this->type()->copy_expressions(); | |
13416 | return new Fixed_array_construction_expression(t, this->indexes(), | |
13417 | (this->vals() == NULL | |
13418 | ? NULL | |
13419 | : this->vals()->copy()), | |
13420 | this->location()); | |
13421 | } | |
13422 | ||
ea664253 | 13423 | // Return the backend representation for constructing a fixed array. |
e440a328 | 13424 | |
ea664253 | 13425 | Bexpression* |
13426 | Fixed_array_construction_expression::do_get_backend(Translate_context* context) | |
e440a328 | 13427 | { |
9f0e0513 | 13428 | Type* type = this->type(); |
13429 | Btype* btype = type->get_backend(context->gogo()); | |
ea664253 | 13430 | return this->get_constructor(context, btype); |
e440a328 | 13431 | } |
13432 | ||
76f85fd6 | 13433 | Expression* |
13434 | Expression::make_array_composite_literal(Type* type, Expression_list* vals, | |
13435 | Location location) | |
13436 | { | |
13437 | go_assert(type->array_type() != NULL && !type->is_slice_type()); | |
13438 | return new Fixed_array_construction_expression(type, NULL, vals, location); | |
13439 | } | |
13440 | ||
da244e59 | 13441 | // Class Slice_construction_expression. |
e440a328 | 13442 | |
da244e59 | 13443 | Slice_construction_expression::Slice_construction_expression( |
13444 | Type* type, const std::vector<unsigned long>* indexes, | |
13445 | Expression_list* vals, Location location) | |
13446 | : Array_construction_expression(EXPRESSION_SLICE_CONSTRUCTION, | |
13447 | type, indexes, vals, location), | |
0e9a2e72 | 13448 | valtype_(NULL), array_val_(NULL), slice_storage_(NULL), |
13449 | storage_escapes_(true) | |
e440a328 | 13450 | { |
da244e59 | 13451 | go_assert(type->is_slice_type()); |
23d77f91 | 13452 | |
da244e59 | 13453 | unsigned long lenval; |
13454 | Expression* length; | |
13455 | if (vals == NULL || vals->empty()) | |
13456 | lenval = 0; | |
13457 | else | |
13458 | { | |
13459 | if (this->indexes() == NULL) | |
13460 | lenval = vals->size(); | |
13461 | else | |
13462 | lenval = indexes->back() + 1; | |
13463 | } | |
13464 | Type* int_type = Type::lookup_integer_type("int"); | |
13465 | length = Expression::make_integer_ul(lenval, int_type, location); | |
13466 | Type* element_type = type->array_type()->element_type(); | |
6bf4793c | 13467 | Array_type* array_type = Type::make_array_type(element_type, length); |
13468 | array_type->set_is_array_incomparable(); | |
13469 | this->valtype_ = array_type; | |
da244e59 | 13470 | } |
e440a328 | 13471 | |
23d77f91 | 13472 | // Traversal. |
13473 | ||
13474 | int | |
13475 | Slice_construction_expression::do_traverse(Traverse* traverse) | |
13476 | { | |
13477 | if (this->Array_construction_expression::do_traverse(traverse) | |
13478 | == TRAVERSE_EXIT) | |
13479 | return TRAVERSE_EXIT; | |
13480 | if (Type::traverse(this->valtype_, traverse) == TRAVERSE_EXIT) | |
13481 | return TRAVERSE_EXIT; | |
0e9a2e72 | 13482 | if (this->array_val_ != NULL |
13483 | && Expression::traverse(&this->array_val_, traverse) == TRAVERSE_EXIT) | |
13484 | return TRAVERSE_EXIT; | |
13485 | if (this->slice_storage_ != NULL | |
13486 | && Expression::traverse(&this->slice_storage_, traverse) == TRAVERSE_EXIT) | |
13487 | return TRAVERSE_EXIT; | |
23d77f91 | 13488 | return TRAVERSE_CONTINUE; |
13489 | } | |
13490 | ||
0e9a2e72 | 13491 | // Helper routine to create fixed array value underlying the slice literal. |
13492 | // May be called during flattening, or later during do_get_backend(). | |
e440a328 | 13493 | |
0e9a2e72 | 13494 | Expression* |
13495 | Slice_construction_expression::create_array_val() | |
e440a328 | 13496 | { |
f9c68f17 | 13497 | Array_type* array_type = this->type()->array_type(); |
13498 | if (array_type == NULL) | |
13499 | { | |
c484d925 | 13500 | go_assert(this->type()->is_error()); |
0e9a2e72 | 13501 | return NULL; |
f9c68f17 | 13502 | } |
13503 | ||
f23d7786 | 13504 | Location loc = this->location(); |
23d77f91 | 13505 | go_assert(this->valtype_ != NULL); |
3d60812e | 13506 | |
f23d7786 | 13507 | Expression_list* vals = this->vals(); |
0e9a2e72 | 13508 | return new Fixed_array_construction_expression( |
13509 | this->valtype_, this->indexes(), vals, loc); | |
13510 | } | |
13511 | ||
13512 | // If we're previous established that the slice storage does not | |
13513 | // escape, then create a separate array temp val here for it. We | |
13514 | // need to do this as part of flattening so as to be able to insert | |
13515 | // the new temp statement. | |
13516 | ||
13517 | Expression* | |
13518 | Slice_construction_expression::do_flatten(Gogo* gogo, Named_object* no, | |
13519 | Statement_inserter* inserter) | |
13520 | { | |
13521 | if (this->type()->array_type() == NULL) | |
13522 | return NULL; | |
13523 | ||
13524 | // Base class flattening first | |
13525 | this->Array_construction_expression::do_flatten(gogo, no, inserter); | |
13526 | ||
a1bbc2c3 | 13527 | // Create a stack-allocated storage temp if storage won't escape |
03118c21 | 13528 | if (!this->storage_escapes_ |
13529 | && this->slice_storage_ == NULL | |
13530 | && this->element_count() > 0) | |
0e9a2e72 | 13531 | { |
13532 | Location loc = this->location(); | |
03118c21 | 13533 | this->array_val_ = this->create_array_val(); |
0e9a2e72 | 13534 | go_assert(this->array_val_); |
13535 | Temporary_statement* temp = | |
13536 | Statement::make_temporary(this->valtype_, this->array_val_, loc); | |
13537 | inserter->insert(temp); | |
13538 | this->slice_storage_ = Expression::make_temporary_reference(temp, loc); | |
13539 | } | |
13540 | return this; | |
13541 | } | |
13542 | ||
13543 | // When dumping a slice construction expression that has an explicit | |
13544 | // storeage temp, emit the temp here (if we don't do this the storage | |
13545 | // temp appears unused in the AST dump). | |
13546 | ||
13547 | void | |
13548 | Slice_construction_expression:: | |
13549 | dump_slice_storage_expression(Ast_dump_context* ast_dump_context) const | |
13550 | { | |
13551 | if (this->slice_storage_ == NULL) | |
13552 | return; | |
13553 | ast_dump_context->ostream() << "storage=" ; | |
13554 | ast_dump_context->dump_expression(this->slice_storage_); | |
13555 | } | |
13556 | ||
de590a61 | 13557 | // Copy. |
13558 | ||
13559 | Expression* | |
13560 | Slice_construction_expression::do_copy() | |
13561 | { | |
13562 | return new Slice_construction_expression(this->type()->copy_expressions(), | |
13563 | this->indexes(), | |
13564 | (this->vals() == NULL | |
13565 | ? NULL | |
13566 | : this->vals()->copy()), | |
13567 | this->location()); | |
13568 | } | |
13569 | ||
0e9a2e72 | 13570 | // Return the backend representation for constructing a slice. |
13571 | ||
13572 | Bexpression* | |
13573 | Slice_construction_expression::do_get_backend(Translate_context* context) | |
13574 | { | |
13575 | if (this->array_val_ == NULL) | |
03118c21 | 13576 | this->array_val_ = this->create_array_val(); |
0e9a2e72 | 13577 | if (this->array_val_ == NULL) |
13578 | { | |
13579 | go_assert(this->type()->is_error()); | |
13580 | return context->backend()->error_expression(); | |
13581 | } | |
13582 | ||
13583 | Location loc = this->location(); | |
e440a328 | 13584 | |
3ae06f68 | 13585 | bool is_static_initializer = this->array_val_->is_static_initializer(); |
d8829beb | 13586 | |
13587 | // We have to copy the initial values into heap memory if we are in | |
3ae06f68 | 13588 | // a function or if the values are not constants. |
13589 | bool copy_to_heap = context->function() != NULL || !is_static_initializer; | |
e440a328 | 13590 | |
f23d7786 | 13591 | Expression* space; |
0e9a2e72 | 13592 | |
13593 | if (this->slice_storage_ != NULL) | |
13594 | { | |
13595 | go_assert(!this->storage_escapes_); | |
13596 | space = Expression::make_unary(OPERATOR_AND, this->slice_storage_, loc); | |
13597 | } | |
13598 | else if (!copy_to_heap) | |
e440a328 | 13599 | { |
f23d7786 | 13600 | // The initializer will only run once. |
0e9a2e72 | 13601 | space = Expression::make_unary(OPERATOR_AND, this->array_val_, loc); |
f23d7786 | 13602 | space->unary_expression()->set_is_slice_init(); |
e440a328 | 13603 | } |
13604 | else | |
45ff893b | 13605 | { |
5973ede0 | 13606 | go_assert(this->storage_escapes_ || this->element_count() == 0); |
0e9a2e72 | 13607 | space = Expression::make_heap_expression(this->array_val_, loc); |
45ff893b | 13608 | } |
d633d0fb | 13609 | Array_type* at = this->valtype_->array_type(); |
13610 | Type* et = at->element_type(); | |
13611 | space = Expression::make_unsafe_cast(Type::make_pointer_type(et), | |
13612 | space, loc); | |
e440a328 | 13613 | |
2c809f8f | 13614 | // Build a constructor for the slice. |
d633d0fb | 13615 | Expression* len = at->length(); |
f23d7786 | 13616 | Expression* slice_val = |
13617 | Expression::make_slice_value(this->type(), space, len, len, loc); | |
ea664253 | 13618 | return slice_val->get_backend(context); |
e440a328 | 13619 | } |
13620 | ||
13621 | // Make a slice composite literal. This is used by the type | |
13622 | // descriptor code. | |
13623 | ||
0e9a2e72 | 13624 | Slice_construction_expression* |
e440a328 | 13625 | Expression::make_slice_composite_literal(Type* type, Expression_list* vals, |
b13c66cd | 13626 | Location location) |
e440a328 | 13627 | { |
411eb89e | 13628 | go_assert(type->is_slice_type()); |
2c809f8f | 13629 | return new Slice_construction_expression(type, NULL, vals, location); |
e440a328 | 13630 | } |
13631 | ||
da244e59 | 13632 | // Class Map_construction_expression. |
e440a328 | 13633 | |
13634 | // Traversal. | |
13635 | ||
13636 | int | |
13637 | Map_construction_expression::do_traverse(Traverse* traverse) | |
13638 | { | |
13639 | if (this->vals_ != NULL | |
13640 | && this->vals_->traverse(traverse) == TRAVERSE_EXIT) | |
13641 | return TRAVERSE_EXIT; | |
13642 | if (Type::traverse(this->type_, traverse) == TRAVERSE_EXIT) | |
13643 | return TRAVERSE_EXIT; | |
13644 | return TRAVERSE_CONTINUE; | |
13645 | } | |
13646 | ||
2c809f8f | 13647 | // Flatten constructor initializer into a temporary variable since |
13648 | // we need to take its address for __go_construct_map. | |
13649 | ||
13650 | Expression* | |
13651 | Map_construction_expression::do_flatten(Gogo* gogo, Named_object*, | |
13652 | Statement_inserter* inserter) | |
13653 | { | |
13654 | if (!this->is_error_expression() | |
13655 | && this->vals_ != NULL | |
13656 | && !this->vals_->empty() | |
13657 | && this->constructor_temp_ == NULL) | |
13658 | { | |
13659 | Map_type* mt = this->type_->map_type(); | |
13660 | Type* key_type = mt->key_type(); | |
13661 | Type* val_type = mt->val_type(); | |
13662 | this->element_type_ = Type::make_builtin_struct_type(2, | |
13663 | "__key", key_type, | |
13664 | "__val", val_type); | |
13665 | ||
13666 | Expression_list* value_pairs = new Expression_list(); | |
13667 | Location loc = this->location(); | |
13668 | ||
13669 | size_t i = 0; | |
13670 | for (Expression_list::const_iterator pv = this->vals_->begin(); | |
13671 | pv != this->vals_->end(); | |
13672 | ++pv, ++i) | |
13673 | { | |
13674 | Expression_list* key_value_pair = new Expression_list(); | |
91c0fd76 | 13675 | Expression* key = *pv; |
5bf8be8b | 13676 | if (key->is_error_expression() || key->type()->is_error_type()) |
13677 | { | |
13678 | go_assert(saw_errors()); | |
13679 | return Expression::make_error(loc); | |
13680 | } | |
91c0fd76 | 13681 | if (key->type()->interface_type() != NULL && !key->is_variable()) |
13682 | { | |
13683 | Temporary_statement* temp = | |
13684 | Statement::make_temporary(NULL, key, loc); | |
13685 | inserter->insert(temp); | |
13686 | key = Expression::make_temporary_reference(temp, loc); | |
13687 | } | |
13688 | key = Expression::convert_for_assignment(gogo, key_type, key, loc); | |
2c809f8f | 13689 | |
13690 | ++pv; | |
91c0fd76 | 13691 | Expression* val = *pv; |
5bf8be8b | 13692 | if (val->is_error_expression() || val->type()->is_error_type()) |
13693 | { | |
13694 | go_assert(saw_errors()); | |
13695 | return Expression::make_error(loc); | |
13696 | } | |
91c0fd76 | 13697 | if (val->type()->interface_type() != NULL && !val->is_variable()) |
13698 | { | |
13699 | Temporary_statement* temp = | |
13700 | Statement::make_temporary(NULL, val, loc); | |
13701 | inserter->insert(temp); | |
13702 | val = Expression::make_temporary_reference(temp, loc); | |
13703 | } | |
13704 | val = Expression::convert_for_assignment(gogo, val_type, val, loc); | |
2c809f8f | 13705 | |
13706 | key_value_pair->push_back(key); | |
13707 | key_value_pair->push_back(val); | |
13708 | value_pairs->push_back( | |
13709 | Expression::make_struct_composite_literal(this->element_type_, | |
13710 | key_value_pair, loc)); | |
13711 | } | |
13712 | ||
e67508fa | 13713 | Expression* element_count = Expression::make_integer_ul(i, NULL, loc); |
6bf4793c | 13714 | Array_type* ctor_type = |
2c809f8f | 13715 | Type::make_array_type(this->element_type_, element_count); |
6bf4793c | 13716 | ctor_type->set_is_array_incomparable(); |
2c809f8f | 13717 | Expression* constructor = |
13718 | new Fixed_array_construction_expression(ctor_type, NULL, | |
13719 | value_pairs, loc); | |
13720 | ||
13721 | this->constructor_temp_ = | |
13722 | Statement::make_temporary(NULL, constructor, loc); | |
13723 | constructor->issue_nil_check(); | |
13724 | this->constructor_temp_->set_is_address_taken(); | |
13725 | inserter->insert(this->constructor_temp_); | |
13726 | } | |
13727 | ||
13728 | return this; | |
13729 | } | |
13730 | ||
e440a328 | 13731 | // Final type determination. |
13732 | ||
13733 | void | |
13734 | Map_construction_expression::do_determine_type(const Type_context*) | |
13735 | { | |
13736 | if (this->vals_ == NULL) | |
13737 | return; | |
13738 | ||
13739 | Map_type* mt = this->type_->map_type(); | |
13740 | Type_context key_context(mt->key_type(), false); | |
13741 | Type_context val_context(mt->val_type(), false); | |
13742 | for (Expression_list::const_iterator pv = this->vals_->begin(); | |
13743 | pv != this->vals_->end(); | |
13744 | ++pv) | |
13745 | { | |
13746 | (*pv)->determine_type(&key_context); | |
13747 | ++pv; | |
13748 | (*pv)->determine_type(&val_context); | |
13749 | } | |
13750 | } | |
13751 | ||
13752 | // Check types. | |
13753 | ||
13754 | void | |
13755 | Map_construction_expression::do_check_types(Gogo*) | |
13756 | { | |
13757 | if (this->vals_ == NULL) | |
13758 | return; | |
13759 | ||
13760 | Map_type* mt = this->type_->map_type(); | |
13761 | int i = 0; | |
13762 | Type* key_type = mt->key_type(); | |
13763 | Type* val_type = mt->val_type(); | |
13764 | for (Expression_list::const_iterator pv = this->vals_->begin(); | |
13765 | pv != this->vals_->end(); | |
13766 | ++pv, ++i) | |
13767 | { | |
13768 | if (!Type::are_assignable(key_type, (*pv)->type(), NULL)) | |
13769 | { | |
631d5788 | 13770 | go_error_at((*pv)->location(), |
13771 | "incompatible type for element %d key in map construction", | |
13772 | i + 1); | |
e440a328 | 13773 | this->set_is_error(); |
13774 | } | |
13775 | ++pv; | |
13776 | if (!Type::are_assignable(val_type, (*pv)->type(), NULL)) | |
13777 | { | |
631d5788 | 13778 | go_error_at((*pv)->location(), |
13779 | ("incompatible type for element %d value " | |
13780 | "in map construction"), | |
e440a328 | 13781 | i + 1); |
13782 | this->set_is_error(); | |
13783 | } | |
13784 | } | |
13785 | } | |
13786 | ||
de590a61 | 13787 | // Copy. |
13788 | ||
13789 | Expression* | |
13790 | Map_construction_expression::do_copy() | |
13791 | { | |
13792 | return new Map_construction_expression(this->type_->copy_expressions(), | |
13793 | (this->vals_ == NULL | |
13794 | ? NULL | |
13795 | : this->vals_->copy()), | |
13796 | this->location()); | |
13797 | } | |
13798 | ||
ea664253 | 13799 | // Return the backend representation for constructing a map. |
e440a328 | 13800 | |
ea664253 | 13801 | Bexpression* |
13802 | Map_construction_expression::do_get_backend(Translate_context* context) | |
e440a328 | 13803 | { |
2c809f8f | 13804 | if (this->is_error_expression()) |
ea664253 | 13805 | return context->backend()->error_expression(); |
2c809f8f | 13806 | Location loc = this->location(); |
e440a328 | 13807 | |
e440a328 | 13808 | size_t i = 0; |
2c809f8f | 13809 | Expression* ventries; |
e440a328 | 13810 | if (this->vals_ == NULL || this->vals_->empty()) |
2c809f8f | 13811 | ventries = Expression::make_nil(loc); |
e440a328 | 13812 | else |
13813 | { | |
2c809f8f | 13814 | go_assert(this->constructor_temp_ != NULL); |
13815 | i = this->vals_->size() / 2; | |
e440a328 | 13816 | |
2c809f8f | 13817 | Expression* ctor_ref = |
13818 | Expression::make_temporary_reference(this->constructor_temp_, loc); | |
13819 | ventries = Expression::make_unary(OPERATOR_AND, ctor_ref, loc); | |
13820 | } | |
e440a328 | 13821 | |
2c809f8f | 13822 | Map_type* mt = this->type_->map_type(); |
13823 | if (this->element_type_ == NULL) | |
13824 | this->element_type_ = | |
13825 | Type::make_builtin_struct_type(2, | |
13826 | "__key", mt->key_type(), | |
13827 | "__val", mt->val_type()); | |
0d5530d9 | 13828 | Expression* descriptor = Expression::make_type_descriptor(mt, loc); |
2c809f8f | 13829 | |
13830 | Type* uintptr_t = Type::lookup_integer_type("uintptr"); | |
e67508fa | 13831 | Expression* count = Expression::make_integer_ul(i, uintptr_t, loc); |
2c809f8f | 13832 | |
13833 | Expression* entry_size = | |
13834 | Expression::make_type_info(this->element_type_, TYPE_INFO_SIZE); | |
13835 | ||
13836 | unsigned int field_index; | |
13837 | const Struct_field* valfield = | |
13838 | this->element_type_->find_local_field("__val", &field_index); | |
13839 | Expression* val_offset = | |
13840 | Expression::make_struct_field_offset(this->element_type_, valfield); | |
2c809f8f | 13841 | |
13842 | Expression* map_ctor = | |
0d5530d9 | 13843 | Runtime::make_call(Runtime::CONSTRUCT_MAP, loc, 5, descriptor, count, |
13844 | entry_size, val_offset, ventries); | |
ea664253 | 13845 | return map_ctor->get_backend(context); |
2c809f8f | 13846 | } |
e440a328 | 13847 | |
2c809f8f | 13848 | // Export an array construction. |
e440a328 | 13849 | |
2c809f8f | 13850 | void |
548be246 | 13851 | Map_construction_expression::do_export(Export_function_body* efb) const |
2c809f8f | 13852 | { |
204d4af4 | 13853 | efb->write_c_string("$convert("); |
548be246 | 13854 | efb->write_type(this->type_); |
2c809f8f | 13855 | for (Expression_list::const_iterator pv = this->vals_->begin(); |
13856 | pv != this->vals_->end(); | |
13857 | ++pv) | |
13858 | { | |
548be246 | 13859 | efb->write_c_string(", "); |
13860 | (*pv)->export_expression(efb); | |
2c809f8f | 13861 | } |
548be246 | 13862 | efb->write_c_string(")"); |
2c809f8f | 13863 | } |
e440a328 | 13864 | |
2c809f8f | 13865 | // Dump ast representation for a map construction expression. |
d751bb78 | 13866 | |
13867 | void | |
13868 | Map_construction_expression::do_dump_expression( | |
13869 | Ast_dump_context* ast_dump_context) const | |
13870 | { | |
d751bb78 | 13871 | ast_dump_context->ostream() << "{" ; |
8b1c301d | 13872 | ast_dump_context->dump_expression_list(this->vals_, true); |
d751bb78 | 13873 | ast_dump_context->ostream() << "}"; |
13874 | } | |
13875 | ||
7795ac51 | 13876 | // Class Composite_literal_expression. |
e440a328 | 13877 | |
13878 | // Traversal. | |
13879 | ||
13880 | int | |
13881 | Composite_literal_expression::do_traverse(Traverse* traverse) | |
13882 | { | |
dbffccfc | 13883 | if (Type::traverse(this->type_, traverse) == TRAVERSE_EXIT) |
e440a328 | 13884 | return TRAVERSE_EXIT; |
dbffccfc | 13885 | |
13886 | // If this is a struct composite literal with keys, then the keys | |
13887 | // are field names, not expressions. We don't want to traverse them | |
13888 | // in that case. If we do, we can give an erroneous error "variable | |
13889 | // initializer refers to itself." See bug482.go in the testsuite. | |
13890 | if (this->has_keys_ && this->vals_ != NULL) | |
13891 | { | |
13892 | // The type may not be resolvable at this point. | |
13893 | Type* type = this->type_; | |
a01f2481 | 13894 | |
7795ac51 | 13895 | for (int depth = 0; depth < this->depth_; ++depth) |
a01f2481 | 13896 | { |
13897 | if (type->array_type() != NULL) | |
13898 | type = type->array_type()->element_type(); | |
13899 | else if (type->map_type() != NULL) | |
7795ac51 | 13900 | { |
13901 | if (this->key_path_[depth]) | |
13902 | type = type->map_type()->key_type(); | |
13903 | else | |
13904 | type = type->map_type()->val_type(); | |
13905 | } | |
a01f2481 | 13906 | else |
13907 | { | |
13908 | // This error will be reported during lowering. | |
13909 | return TRAVERSE_CONTINUE; | |
13910 | } | |
13911 | } | |
13912 | ||
dbffccfc | 13913 | while (true) |
13914 | { | |
13915 | if (type->classification() == Type::TYPE_NAMED) | |
13916 | type = type->named_type()->real_type(); | |
13917 | else if (type->classification() == Type::TYPE_FORWARD) | |
13918 | { | |
13919 | Type* t = type->forwarded(); | |
13920 | if (t == type) | |
13921 | break; | |
13922 | type = t; | |
13923 | } | |
13924 | else | |
13925 | break; | |
13926 | } | |
13927 | ||
13928 | if (type->classification() == Type::TYPE_STRUCT) | |
13929 | { | |
13930 | Expression_list::iterator p = this->vals_->begin(); | |
13931 | while (p != this->vals_->end()) | |
13932 | { | |
13933 | // Skip key. | |
13934 | ++p; | |
13935 | go_assert(p != this->vals_->end()); | |
13936 | if (Expression::traverse(&*p, traverse) == TRAVERSE_EXIT) | |
13937 | return TRAVERSE_EXIT; | |
13938 | ++p; | |
13939 | } | |
13940 | return TRAVERSE_CONTINUE; | |
13941 | } | |
13942 | } | |
13943 | ||
13944 | if (this->vals_ != NULL) | |
13945 | return this->vals_->traverse(traverse); | |
13946 | ||
13947 | return TRAVERSE_CONTINUE; | |
e440a328 | 13948 | } |
13949 | ||
13950 | // Lower a generic composite literal into a specific version based on | |
13951 | // the type. | |
13952 | ||
13953 | Expression* | |
ceeb4318 | 13954 | Composite_literal_expression::do_lower(Gogo* gogo, Named_object* function, |
13955 | Statement_inserter* inserter, int) | |
e440a328 | 13956 | { |
13957 | Type* type = this->type_; | |
13958 | ||
7795ac51 | 13959 | for (int depth = 0; depth < this->depth_; ++depth) |
e440a328 | 13960 | { |
67a2ed75 | 13961 | type = type->deref(); |
e440a328 | 13962 | if (type->array_type() != NULL) |
13963 | type = type->array_type()->element_type(); | |
13964 | else if (type->map_type() != NULL) | |
7795ac51 | 13965 | { |
13966 | if (this->key_path_[depth]) | |
13967 | type = type->map_type()->key_type(); | |
13968 | else | |
13969 | type = type->map_type()->val_type(); | |
13970 | } | |
e440a328 | 13971 | else |
13972 | { | |
5c13bd80 | 13973 | if (!type->is_error()) |
631d5788 | 13974 | go_error_at(this->location(), |
13975 | ("may only omit types within composite literals " | |
13976 | "of slice, array, or map type")); | |
e440a328 | 13977 | return Expression::make_error(this->location()); |
13978 | } | |
13979 | } | |
13980 | ||
e00772b3 | 13981 | Type *pt = type->points_to(); |
13982 | bool is_pointer = false; | |
13983 | if (pt != NULL) | |
13984 | { | |
13985 | is_pointer = true; | |
13986 | type = pt; | |
13987 | } | |
13988 | ||
13989 | Expression* ret; | |
5c13bd80 | 13990 | if (type->is_error()) |
e440a328 | 13991 | return Expression::make_error(this->location()); |
13992 | else if (type->struct_type() != NULL) | |
e00772b3 | 13993 | ret = this->lower_struct(gogo, type); |
e440a328 | 13994 | else if (type->array_type() != NULL) |
113ef6a5 | 13995 | ret = this->lower_array(type); |
e440a328 | 13996 | else if (type->map_type() != NULL) |
e00772b3 | 13997 | ret = this->lower_map(gogo, function, inserter, type); |
e440a328 | 13998 | else |
13999 | { | |
631d5788 | 14000 | go_error_at(this->location(), |
14001 | ("expected struct, slice, array, or map type " | |
14002 | "for composite literal")); | |
e440a328 | 14003 | return Expression::make_error(this->location()); |
14004 | } | |
e00772b3 | 14005 | |
14006 | if (is_pointer) | |
2c809f8f | 14007 | ret = Expression::make_heap_expression(ret, this->location()); |
e00772b3 | 14008 | |
14009 | return ret; | |
e440a328 | 14010 | } |
14011 | ||
14012 | // Lower a struct composite literal. | |
14013 | ||
14014 | Expression* | |
81c4b26b | 14015 | Composite_literal_expression::lower_struct(Gogo* gogo, Type* type) |
e440a328 | 14016 | { |
b13c66cd | 14017 | Location location = this->location(); |
e440a328 | 14018 | Struct_type* st = type->struct_type(); |
14019 | if (this->vals_ == NULL || !this->has_keys_) | |
07daa4e7 | 14020 | { |
e6013c28 | 14021 | if (this->vals_ != NULL |
14022 | && !this->vals_->empty() | |
14023 | && type->named_type() != NULL | |
14024 | && type->named_type()->named_object()->package() != NULL) | |
14025 | { | |
14026 | for (Struct_field_list::const_iterator pf = st->fields()->begin(); | |
14027 | pf != st->fields()->end(); | |
14028 | ++pf) | |
07daa4e7 | 14029 | { |
07ba7f26 | 14030 | if (Gogo::is_hidden_name(pf->field_name()) |
14031 | || pf->is_embedded_builtin(gogo)) | |
631d5788 | 14032 | go_error_at(this->location(), |
14033 | "assignment of unexported field %qs in %qs literal", | |
14034 | Gogo::message_name(pf->field_name()).c_str(), | |
14035 | type->named_type()->message_name().c_str()); | |
07daa4e7 | 14036 | } |
14037 | } | |
14038 | ||
14039 | return new Struct_construction_expression(type, this->vals_, location); | |
14040 | } | |
e440a328 | 14041 | |
14042 | size_t field_count = st->field_count(); | |
14043 | std::vector<Expression*> vals(field_count); | |
e32de7ba | 14044 | std::vector<unsigned long>* traverse_order = new(std::vector<unsigned long>); |
e440a328 | 14045 | Expression_list::const_iterator p = this->vals_->begin(); |
62750cd5 | 14046 | Expression* external_expr = NULL; |
14047 | const Named_object* external_no = NULL; | |
e440a328 | 14048 | while (p != this->vals_->end()) |
14049 | { | |
14050 | Expression* name_expr = *p; | |
14051 | ||
14052 | ++p; | |
c484d925 | 14053 | go_assert(p != this->vals_->end()); |
e440a328 | 14054 | Expression* val = *p; |
14055 | ||
14056 | ++p; | |
14057 | ||
14058 | if (name_expr == NULL) | |
14059 | { | |
631d5788 | 14060 | go_error_at(val->location(), |
14061 | "mixture of field and value initializers"); | |
e440a328 | 14062 | return Expression::make_error(location); |
14063 | } | |
14064 | ||
14065 | bool bad_key = false; | |
14066 | std::string name; | |
81c4b26b | 14067 | const Named_object* no = NULL; |
e440a328 | 14068 | switch (name_expr->classification()) |
14069 | { | |
14070 | case EXPRESSION_UNKNOWN_REFERENCE: | |
14071 | name = name_expr->unknown_expression()->name(); | |
7f7ce694 | 14072 | if (type->named_type() != NULL) |
14073 | { | |
14074 | // If the named object found for this field name comes from a | |
14075 | // different package than the struct it is a part of, do not count | |
14076 | // this incorrect lookup as a usage of the object's package. | |
14077 | no = name_expr->unknown_expression()->named_object(); | |
14078 | if (no->package() != NULL | |
14079 | && no->package() != type->named_type()->named_object()->package()) | |
14080 | no->package()->forget_usage(name_expr); | |
14081 | } | |
e440a328 | 14082 | break; |
14083 | ||
14084 | case EXPRESSION_CONST_REFERENCE: | |
81c4b26b | 14085 | no = static_cast<Const_expression*>(name_expr)->named_object(); |
e440a328 | 14086 | break; |
14087 | ||
14088 | case EXPRESSION_TYPE: | |
14089 | { | |
14090 | Type* t = name_expr->type(); | |
14091 | Named_type* nt = t->named_type(); | |
14092 | if (nt == NULL) | |
14093 | bad_key = true; | |
14094 | else | |
81c4b26b | 14095 | no = nt->named_object(); |
e440a328 | 14096 | } |
14097 | break; | |
14098 | ||
14099 | case EXPRESSION_VAR_REFERENCE: | |
81c4b26b | 14100 | no = name_expr->var_expression()->named_object(); |
e440a328 | 14101 | break; |
14102 | ||
b0c09712 | 14103 | case EXPRESSION_ENCLOSED_VAR_REFERENCE: |
14104 | no = name_expr->enclosed_var_expression()->variable(); | |
e440a328 | 14105 | break; |
14106 | ||
b0c09712 | 14107 | case EXPRESSION_FUNC_REFERENCE: |
14108 | no = name_expr->func_expression()->named_object(); | |
e440a328 | 14109 | break; |
14110 | ||
14111 | default: | |
14112 | bad_key = true; | |
14113 | break; | |
14114 | } | |
14115 | if (bad_key) | |
14116 | { | |
631d5788 | 14117 | go_error_at(name_expr->location(), "expected struct field name"); |
e440a328 | 14118 | return Expression::make_error(location); |
14119 | } | |
14120 | ||
81c4b26b | 14121 | if (no != NULL) |
14122 | { | |
62750cd5 | 14123 | if (no->package() != NULL && external_expr == NULL) |
14124 | { | |
14125 | external_expr = name_expr; | |
14126 | external_no = no; | |
14127 | } | |
14128 | ||
81c4b26b | 14129 | name = no->name(); |
14130 | ||
14131 | // A predefined name won't be packed. If it starts with a | |
14132 | // lower case letter we need to check for that case, because | |
2d29d278 | 14133 | // the field name will be packed. FIXME. |
81c4b26b | 14134 | if (!Gogo::is_hidden_name(name) |
14135 | && name[0] >= 'a' | |
14136 | && name[0] <= 'z') | |
14137 | { | |
14138 | Named_object* gno = gogo->lookup_global(name.c_str()); | |
14139 | if (gno == no) | |
14140 | name = gogo->pack_hidden_name(name, false); | |
14141 | } | |
14142 | } | |
14143 | ||
e440a328 | 14144 | unsigned int index; |
14145 | const Struct_field* sf = st->find_local_field(name, &index); | |
14146 | if (sf == NULL) | |
14147 | { | |
631d5788 | 14148 | go_error_at(name_expr->location(), "unknown field %qs in %qs", |
14149 | Gogo::message_name(name).c_str(), | |
14150 | (type->named_type() != NULL | |
14151 | ? type->named_type()->message_name().c_str() | |
14152 | : "unnamed struct")); | |
e440a328 | 14153 | return Expression::make_error(location); |
14154 | } | |
14155 | if (vals[index] != NULL) | |
14156 | { | |
631d5788 | 14157 | go_error_at(name_expr->location(), |
14158 | "duplicate value for field %qs in %qs", | |
14159 | Gogo::message_name(name).c_str(), | |
14160 | (type->named_type() != NULL | |
14161 | ? type->named_type()->message_name().c_str() | |
14162 | : "unnamed struct")); | |
e440a328 | 14163 | return Expression::make_error(location); |
14164 | } | |
14165 | ||
07daa4e7 | 14166 | if (type->named_type() != NULL |
14167 | && type->named_type()->named_object()->package() != NULL | |
07ba7f26 | 14168 | && (Gogo::is_hidden_name(sf->field_name()) |
14169 | || sf->is_embedded_builtin(gogo))) | |
631d5788 | 14170 | go_error_at(name_expr->location(), |
14171 | "assignment of unexported field %qs in %qs literal", | |
14172 | Gogo::message_name(sf->field_name()).c_str(), | |
14173 | type->named_type()->message_name().c_str()); | |
07daa4e7 | 14174 | |
e440a328 | 14175 | vals[index] = val; |
e32de7ba | 14176 | traverse_order->push_back(static_cast<unsigned long>(index)); |
e440a328 | 14177 | } |
14178 | ||
62750cd5 | 14179 | if (!this->all_are_names_) |
14180 | { | |
14181 | // This is a weird case like bug462 in the testsuite. | |
14182 | if (external_expr == NULL) | |
631d5788 | 14183 | go_error_at(this->location(), "unknown field in %qs literal", |
14184 | (type->named_type() != NULL | |
14185 | ? type->named_type()->message_name().c_str() | |
14186 | : "unnamed struct")); | |
62750cd5 | 14187 | else |
631d5788 | 14188 | go_error_at(external_expr->location(), "unknown field %qs in %qs", |
14189 | external_no->message_name().c_str(), | |
14190 | (type->named_type() != NULL | |
14191 | ? type->named_type()->message_name().c_str() | |
14192 | : "unnamed struct")); | |
62750cd5 | 14193 | return Expression::make_error(location); |
14194 | } | |
14195 | ||
e440a328 | 14196 | Expression_list* list = new Expression_list; |
14197 | list->reserve(field_count); | |
14198 | for (size_t i = 0; i < field_count; ++i) | |
14199 | list->push_back(vals[i]); | |
14200 | ||
0c4f5a19 | 14201 | Struct_construction_expression* ret = |
14202 | new Struct_construction_expression(type, list, location); | |
14203 | ret->set_traverse_order(traverse_order); | |
14204 | return ret; | |
e440a328 | 14205 | } |
14206 | ||
e32de7ba | 14207 | // Index/value/traversal-order triple. |
00773463 | 14208 | |
e32de7ba | 14209 | struct IVT_triple { |
14210 | unsigned long index; | |
14211 | unsigned long traversal_order; | |
14212 | Expression* expr; | |
14213 | IVT_triple(unsigned long i, unsigned long to, Expression *e) | |
14214 | : index(i), traversal_order(to), expr(e) { } | |
14215 | bool operator<(const IVT_triple& other) const | |
14216 | { return this->index < other.index; } | |
00773463 | 14217 | }; |
14218 | ||
e440a328 | 14219 | // Lower an array composite literal. |
14220 | ||
14221 | Expression* | |
113ef6a5 | 14222 | Composite_literal_expression::lower_array(Type* type) |
e440a328 | 14223 | { |
b13c66cd | 14224 | Location location = this->location(); |
e440a328 | 14225 | if (this->vals_ == NULL || !this->has_keys_) |
ffe743ca | 14226 | return this->make_array(type, NULL, this->vals_); |
e440a328 | 14227 | |
ffe743ca | 14228 | std::vector<unsigned long>* indexes = new std::vector<unsigned long>; |
14229 | indexes->reserve(this->vals_->size()); | |
00773463 | 14230 | bool indexes_out_of_order = false; |
ffe743ca | 14231 | Expression_list* vals = new Expression_list(); |
14232 | vals->reserve(this->vals_->size()); | |
e440a328 | 14233 | unsigned long index = 0; |
14234 | Expression_list::const_iterator p = this->vals_->begin(); | |
14235 | while (p != this->vals_->end()) | |
14236 | { | |
14237 | Expression* index_expr = *p; | |
14238 | ||
14239 | ++p; | |
c484d925 | 14240 | go_assert(p != this->vals_->end()); |
e440a328 | 14241 | Expression* val = *p; |
14242 | ||
14243 | ++p; | |
14244 | ||
ffe743ca | 14245 | if (index_expr == NULL) |
14246 | { | |
8f2ebee5 | 14247 | if (std::find(indexes->begin(), indexes->end(), index) |
14248 | != indexes->end()) | |
14249 | { | |
14250 | go_error_at(val->location(), | |
14251 | "duplicate value for index %lu", index); | |
14252 | return Expression::make_error(location); | |
14253 | } | |
ffe743ca | 14254 | if (!indexes->empty()) |
14255 | indexes->push_back(index); | |
14256 | } | |
14257 | else | |
e440a328 | 14258 | { |
ffe743ca | 14259 | if (indexes->empty() && !vals->empty()) |
14260 | { | |
14261 | for (size_t i = 0; i < vals->size(); ++i) | |
14262 | indexes->push_back(i); | |
14263 | } | |
14264 | ||
0c77715b | 14265 | Numeric_constant nc; |
14266 | if (!index_expr->numeric_constant_value(&nc)) | |
e440a328 | 14267 | { |
631d5788 | 14268 | go_error_at(index_expr->location(), |
14269 | "index expression is not integer constant"); | |
e440a328 | 14270 | return Expression::make_error(location); |
14271 | } | |
6f6d9955 | 14272 | |
0c77715b | 14273 | switch (nc.to_unsigned_long(&index)) |
e440a328 | 14274 | { |
0c77715b | 14275 | case Numeric_constant::NC_UL_VALID: |
14276 | break; | |
14277 | case Numeric_constant::NC_UL_NOTINT: | |
631d5788 | 14278 | go_error_at(index_expr->location(), |
14279 | "index expression is not integer constant"); | |
0c77715b | 14280 | return Expression::make_error(location); |
14281 | case Numeric_constant::NC_UL_NEGATIVE: | |
631d5788 | 14282 | go_error_at(index_expr->location(), |
14283 | "index expression is negative"); | |
e440a328 | 14284 | return Expression::make_error(location); |
0c77715b | 14285 | case Numeric_constant::NC_UL_BIG: |
631d5788 | 14286 | go_error_at(index_expr->location(), "index value overflow"); |
e440a328 | 14287 | return Expression::make_error(location); |
0c77715b | 14288 | default: |
14289 | go_unreachable(); | |
e440a328 | 14290 | } |
6f6d9955 | 14291 | |
14292 | Named_type* ntype = Type::lookup_integer_type("int"); | |
14293 | Integer_type* inttype = ntype->integer_type(); | |
0c77715b | 14294 | if (sizeof(index) <= static_cast<size_t>(inttype->bits() * 8) |
14295 | && index >> (inttype->bits() - 1) != 0) | |
6f6d9955 | 14296 | { |
631d5788 | 14297 | go_error_at(index_expr->location(), "index value overflow"); |
6f6d9955 | 14298 | return Expression::make_error(location); |
14299 | } | |
14300 | ||
ffe743ca | 14301 | if (std::find(indexes->begin(), indexes->end(), index) |
14302 | != indexes->end()) | |
e440a328 | 14303 | { |
631d5788 | 14304 | go_error_at(index_expr->location(), |
14305 | "duplicate value for index %lu", | |
14306 | index); | |
e440a328 | 14307 | return Expression::make_error(location); |
14308 | } | |
ffe743ca | 14309 | |
00773463 | 14310 | if (!indexes->empty() && index < indexes->back()) |
14311 | indexes_out_of_order = true; | |
14312 | ||
ffe743ca | 14313 | indexes->push_back(index); |
e440a328 | 14314 | } |
14315 | ||
ffe743ca | 14316 | vals->push_back(val); |
14317 | ||
e440a328 | 14318 | ++index; |
14319 | } | |
14320 | ||
ffe743ca | 14321 | if (indexes->empty()) |
14322 | { | |
14323 | delete indexes; | |
14324 | indexes = NULL; | |
14325 | } | |
e440a328 | 14326 | |
e32de7ba | 14327 | std::vector<unsigned long>* traverse_order = NULL; |
00773463 | 14328 | if (indexes_out_of_order) |
14329 | { | |
e32de7ba | 14330 | typedef std::vector<IVT_triple> V; |
00773463 | 14331 | |
14332 | V v; | |
14333 | v.reserve(indexes->size()); | |
14334 | std::vector<unsigned long>::const_iterator pi = indexes->begin(); | |
e32de7ba | 14335 | unsigned long torder = 0; |
00773463 | 14336 | for (Expression_list::const_iterator pe = vals->begin(); |
14337 | pe != vals->end(); | |
e32de7ba | 14338 | ++pe, ++pi, ++torder) |
14339 | v.push_back(IVT_triple(*pi, torder, *pe)); | |
00773463 | 14340 | |
e32de7ba | 14341 | std::sort(v.begin(), v.end()); |
00773463 | 14342 | |
14343 | delete indexes; | |
14344 | delete vals; | |
e32de7ba | 14345 | |
00773463 | 14346 | indexes = new std::vector<unsigned long>(); |
14347 | indexes->reserve(v.size()); | |
14348 | vals = new Expression_list(); | |
14349 | vals->reserve(v.size()); | |
e32de7ba | 14350 | traverse_order = new std::vector<unsigned long>(); |
14351 | traverse_order->reserve(v.size()); | |
00773463 | 14352 | |
14353 | for (V::const_iterator p = v.begin(); p != v.end(); ++p) | |
14354 | { | |
e32de7ba | 14355 | indexes->push_back(p->index); |
14356 | vals->push_back(p->expr); | |
14357 | traverse_order->push_back(p->traversal_order); | |
00773463 | 14358 | } |
14359 | } | |
14360 | ||
e32de7ba | 14361 | Expression* ret = this->make_array(type, indexes, vals); |
14362 | Array_construction_expression* ace = ret->array_literal(); | |
14363 | if (ace != NULL && traverse_order != NULL) | |
14364 | ace->set_traverse_order(traverse_order); | |
14365 | return ret; | |
e440a328 | 14366 | } |
14367 | ||
14368 | // Actually build the array composite literal. This handles | |
14369 | // [...]{...}. | |
14370 | ||
14371 | Expression* | |
ffe743ca | 14372 | Composite_literal_expression::make_array( |
14373 | Type* type, | |
14374 | const std::vector<unsigned long>* indexes, | |
14375 | Expression_list* vals) | |
e440a328 | 14376 | { |
b13c66cd | 14377 | Location location = this->location(); |
e440a328 | 14378 | Array_type* at = type->array_type(); |
ffe743ca | 14379 | |
e440a328 | 14380 | if (at->length() != NULL && at->length()->is_nil_expression()) |
14381 | { | |
ffe743ca | 14382 | size_t size; |
14383 | if (vals == NULL) | |
14384 | size = 0; | |
00773463 | 14385 | else if (indexes != NULL) |
14386 | size = indexes->back() + 1; | |
14387 | else | |
ffe743ca | 14388 | { |
14389 | size = vals->size(); | |
14390 | Integer_type* it = Type::lookup_integer_type("int")->integer_type(); | |
14391 | if (sizeof(size) <= static_cast<size_t>(it->bits() * 8) | |
14392 | && size >> (it->bits() - 1) != 0) | |
14393 | { | |
631d5788 | 14394 | go_error_at(location, "too many elements in composite literal"); |
ffe743ca | 14395 | return Expression::make_error(location); |
14396 | } | |
14397 | } | |
ffe743ca | 14398 | |
e67508fa | 14399 | Expression* elen = Expression::make_integer_ul(size, NULL, location); |
e440a328 | 14400 | at = Type::make_array_type(at->element_type(), elen); |
14401 | type = at; | |
14402 | } | |
ffe743ca | 14403 | else if (at->length() != NULL |
14404 | && !at->length()->is_error_expression() | |
14405 | && this->vals_ != NULL) | |
14406 | { | |
14407 | Numeric_constant nc; | |
14408 | unsigned long val; | |
14409 | if (at->length()->numeric_constant_value(&nc) | |
14410 | && nc.to_unsigned_long(&val) == Numeric_constant::NC_UL_VALID) | |
14411 | { | |
14412 | if (indexes == NULL) | |
14413 | { | |
14414 | if (this->vals_->size() > val) | |
14415 | { | |
631d5788 | 14416 | go_error_at(location, |
14417 | "too many elements in composite literal"); | |
ffe743ca | 14418 | return Expression::make_error(location); |
14419 | } | |
14420 | } | |
14421 | else | |
14422 | { | |
00773463 | 14423 | unsigned long max = indexes->back(); |
ffe743ca | 14424 | if (max >= val) |
14425 | { | |
631d5788 | 14426 | go_error_at(location, |
14427 | ("some element keys in composite literal " | |
14428 | "are out of range")); | |
ffe743ca | 14429 | return Expression::make_error(location); |
14430 | } | |
14431 | } | |
14432 | } | |
14433 | } | |
14434 | ||
e440a328 | 14435 | if (at->length() != NULL) |
ffe743ca | 14436 | return new Fixed_array_construction_expression(type, indexes, vals, |
14437 | location); | |
e440a328 | 14438 | else |
2c809f8f | 14439 | return new Slice_construction_expression(type, indexes, vals, location); |
e440a328 | 14440 | } |
14441 | ||
14442 | // Lower a map composite literal. | |
14443 | ||
14444 | Expression* | |
a287720d | 14445 | Composite_literal_expression::lower_map(Gogo* gogo, Named_object* function, |
ceeb4318 | 14446 | Statement_inserter* inserter, |
a287720d | 14447 | Type* type) |
e440a328 | 14448 | { |
b13c66cd | 14449 | Location location = this->location(); |
e440a328 | 14450 | if (this->vals_ != NULL) |
14451 | { | |
14452 | if (!this->has_keys_) | |
14453 | { | |
631d5788 | 14454 | go_error_at(location, "map composite literal must have keys"); |
e440a328 | 14455 | return Expression::make_error(location); |
14456 | } | |
14457 | ||
a287720d | 14458 | for (Expression_list::iterator p = this->vals_->begin(); |
e440a328 | 14459 | p != this->vals_->end(); |
14460 | p += 2) | |
14461 | { | |
14462 | if (*p == NULL) | |
14463 | { | |
14464 | ++p; | |
631d5788 | 14465 | go_error_at((*p)->location(), |
14466 | ("map composite literal must " | |
14467 | "have keys for every value")); | |
e440a328 | 14468 | return Expression::make_error(location); |
14469 | } | |
a287720d | 14470 | // Make sure we have lowered the key; it may not have been |
14471 | // lowered in order to handle keys for struct composite | |
14472 | // literals. Lower it now to get the right error message. | |
14473 | if ((*p)->unknown_expression() != NULL) | |
14474 | { | |
14475 | (*p)->unknown_expression()->clear_is_composite_literal_key(); | |
ceeb4318 | 14476 | gogo->lower_expression(function, inserter, &*p); |
c484d925 | 14477 | go_assert((*p)->is_error_expression()); |
a287720d | 14478 | return Expression::make_error(location); |
14479 | } | |
e440a328 | 14480 | } |
14481 | } | |
14482 | ||
14483 | return new Map_construction_expression(type, this->vals_, location); | |
14484 | } | |
14485 | ||
de590a61 | 14486 | // Copy. |
14487 | ||
14488 | Expression* | |
14489 | Composite_literal_expression::do_copy() | |
14490 | { | |
14491 | Composite_literal_expression* ret = | |
14492 | new Composite_literal_expression(this->type_->copy_expressions(), | |
14493 | this->depth_, this->has_keys_, | |
14494 | (this->vals_ == NULL | |
14495 | ? NULL | |
14496 | : this->vals_->copy()), | |
14497 | this->all_are_names_, | |
14498 | this->location()); | |
14499 | ret->key_path_ = this->key_path_; | |
14500 | return ret; | |
14501 | } | |
14502 | ||
d751bb78 | 14503 | // Dump ast representation for a composite literal expression. |
14504 | ||
14505 | void | |
14506 | Composite_literal_expression::do_dump_expression( | |
14507 | Ast_dump_context* ast_dump_context) const | |
14508 | { | |
8b1c301d | 14509 | ast_dump_context->ostream() << "composite("; |
d751bb78 | 14510 | ast_dump_context->dump_type(this->type_); |
14511 | ast_dump_context->ostream() << ", {"; | |
8b1c301d | 14512 | ast_dump_context->dump_expression_list(this->vals_, this->has_keys_); |
d751bb78 | 14513 | ast_dump_context->ostream() << "})"; |
14514 | } | |
14515 | ||
e440a328 | 14516 | // Make a composite literal expression. |
14517 | ||
14518 | Expression* | |
14519 | Expression::make_composite_literal(Type* type, int depth, bool has_keys, | |
62750cd5 | 14520 | Expression_list* vals, bool all_are_names, |
b13c66cd | 14521 | Location location) |
e440a328 | 14522 | { |
14523 | return new Composite_literal_expression(type, depth, has_keys, vals, | |
62750cd5 | 14524 | all_are_names, location); |
e440a328 | 14525 | } |
14526 | ||
14527 | // Return whether this expression is a composite literal. | |
14528 | ||
14529 | bool | |
14530 | Expression::is_composite_literal() const | |
14531 | { | |
14532 | switch (this->classification_) | |
14533 | { | |
14534 | case EXPRESSION_COMPOSITE_LITERAL: | |
14535 | case EXPRESSION_STRUCT_CONSTRUCTION: | |
14536 | case EXPRESSION_FIXED_ARRAY_CONSTRUCTION: | |
2c809f8f | 14537 | case EXPRESSION_SLICE_CONSTRUCTION: |
e440a328 | 14538 | case EXPRESSION_MAP_CONSTRUCTION: |
14539 | return true; | |
14540 | default: | |
14541 | return false; | |
14542 | } | |
14543 | } | |
14544 | ||
14545 | // Return whether this expression is a composite literal which is not | |
14546 | // constant. | |
14547 | ||
14548 | bool | |
14549 | Expression::is_nonconstant_composite_literal() const | |
14550 | { | |
14551 | switch (this->classification_) | |
14552 | { | |
14553 | case EXPRESSION_STRUCT_CONSTRUCTION: | |
14554 | { | |
14555 | const Struct_construction_expression *psce = | |
14556 | static_cast<const Struct_construction_expression*>(this); | |
14557 | return !psce->is_constant_struct(); | |
14558 | } | |
14559 | case EXPRESSION_FIXED_ARRAY_CONSTRUCTION: | |
14560 | { | |
14561 | const Fixed_array_construction_expression *pace = | |
14562 | static_cast<const Fixed_array_construction_expression*>(this); | |
14563 | return !pace->is_constant_array(); | |
14564 | } | |
2c809f8f | 14565 | case EXPRESSION_SLICE_CONSTRUCTION: |
e440a328 | 14566 | { |
2c809f8f | 14567 | const Slice_construction_expression *pace = |
14568 | static_cast<const Slice_construction_expression*>(this); | |
e440a328 | 14569 | return !pace->is_constant_array(); |
14570 | } | |
14571 | case EXPRESSION_MAP_CONSTRUCTION: | |
14572 | return true; | |
14573 | default: | |
14574 | return false; | |
14575 | } | |
14576 | } | |
14577 | ||
35a54f17 | 14578 | // Return true if this is a variable or temporary_variable. |
14579 | ||
14580 | bool | |
14581 | Expression::is_variable() const | |
14582 | { | |
14583 | switch (this->classification_) | |
14584 | { | |
14585 | case EXPRESSION_VAR_REFERENCE: | |
14586 | case EXPRESSION_TEMPORARY_REFERENCE: | |
14587 | case EXPRESSION_SET_AND_USE_TEMPORARY: | |
b0c09712 | 14588 | case EXPRESSION_ENCLOSED_VAR_REFERENCE: |
35a54f17 | 14589 | return true; |
14590 | default: | |
14591 | return false; | |
14592 | } | |
14593 | } | |
14594 | ||
e440a328 | 14595 | // Return true if this is a reference to a local variable. |
14596 | ||
14597 | bool | |
14598 | Expression::is_local_variable() const | |
14599 | { | |
14600 | const Var_expression* ve = this->var_expression(); | |
14601 | if (ve == NULL) | |
14602 | return false; | |
14603 | const Named_object* no = ve->named_object(); | |
14604 | return (no->is_result_variable() | |
14605 | || (no->is_variable() && !no->var_value()->is_global())); | |
14606 | } | |
14607 | ||
14608 | // Class Type_guard_expression. | |
14609 | ||
14610 | // Traversal. | |
14611 | ||
14612 | int | |
14613 | Type_guard_expression::do_traverse(Traverse* traverse) | |
14614 | { | |
14615 | if (Expression::traverse(&this->expr_, traverse) == TRAVERSE_EXIT | |
14616 | || Type::traverse(this->type_, traverse) == TRAVERSE_EXIT) | |
14617 | return TRAVERSE_EXIT; | |
14618 | return TRAVERSE_CONTINUE; | |
14619 | } | |
14620 | ||
2c809f8f | 14621 | Expression* |
14622 | Type_guard_expression::do_flatten(Gogo*, Named_object*, | |
14623 | Statement_inserter* inserter) | |
14624 | { | |
5bf8be8b | 14625 | if (this->expr_->is_error_expression() |
14626 | || this->expr_->type()->is_error_type()) | |
14627 | { | |
14628 | go_assert(saw_errors()); | |
14629 | return Expression::make_error(this->location()); | |
14630 | } | |
14631 | ||
2c809f8f | 14632 | if (!this->expr_->is_variable()) |
14633 | { | |
14634 | Temporary_statement* temp = Statement::make_temporary(NULL, this->expr_, | |
14635 | this->location()); | |
14636 | inserter->insert(temp); | |
14637 | this->expr_ = | |
14638 | Expression::make_temporary_reference(temp, this->location()); | |
14639 | } | |
14640 | return this; | |
14641 | } | |
14642 | ||
e440a328 | 14643 | // Check types of a type guard expression. The expression must have |
14644 | // an interface type, but the actual type conversion is checked at run | |
14645 | // time. | |
14646 | ||
14647 | void | |
14648 | Type_guard_expression::do_check_types(Gogo*) | |
14649 | { | |
e440a328 | 14650 | Type* expr_type = this->expr_->type(); |
7e9da23f | 14651 | if (expr_type->interface_type() == NULL) |
f725ade8 | 14652 | { |
5c13bd80 | 14653 | if (!expr_type->is_error() && !this->type_->is_error()) |
f725ade8 | 14654 | this->report_error(_("type assertion only valid for interface types")); |
14655 | this->set_is_error(); | |
14656 | } | |
e440a328 | 14657 | else if (this->type_->interface_type() == NULL) |
14658 | { | |
14659 | std::string reason; | |
14660 | if (!expr_type->interface_type()->implements_interface(this->type_, | |
14661 | &reason)) | |
14662 | { | |
5c13bd80 | 14663 | if (!this->type_->is_error()) |
e440a328 | 14664 | { |
f725ade8 | 14665 | if (reason.empty()) |
14666 | this->report_error(_("impossible type assertion: " | |
14667 | "type does not implement interface")); | |
14668 | else | |
631d5788 | 14669 | go_error_at(this->location(), |
14670 | ("impossible type assertion: " | |
14671 | "type does not implement interface (%s)"), | |
14672 | reason.c_str()); | |
e440a328 | 14673 | } |
f725ade8 | 14674 | this->set_is_error(); |
e440a328 | 14675 | } |
14676 | } | |
14677 | } | |
14678 | ||
de590a61 | 14679 | // Copy. |
14680 | ||
14681 | Expression* | |
14682 | Type_guard_expression::do_copy() | |
14683 | { | |
14684 | return new Type_guard_expression(this->expr_->copy(), | |
14685 | this->type_->copy_expressions(), | |
14686 | this->location()); | |
14687 | } | |
14688 | ||
ea664253 | 14689 | // Return the backend representation for a type guard expression. |
e440a328 | 14690 | |
ea664253 | 14691 | Bexpression* |
14692 | Type_guard_expression::do_get_backend(Translate_context* context) | |
e440a328 | 14693 | { |
2c809f8f | 14694 | Expression* conversion; |
7e9da23f | 14695 | if (this->type_->interface_type() != NULL) |
2c809f8f | 14696 | conversion = |
14697 | Expression::convert_interface_to_interface(this->type_, this->expr_, | |
14698 | true, this->location()); | |
e440a328 | 14699 | else |
2c809f8f | 14700 | conversion = |
14701 | Expression::convert_for_assignment(context->gogo(), this->type_, | |
14702 | this->expr_, this->location()); | |
14703 | ||
21b70e8f | 14704 | Gogo* gogo = context->gogo(); |
14705 | Btype* bt = this->type_->get_backend(gogo); | |
14706 | Bexpression* bexpr = conversion->get_backend(context); | |
14707 | return gogo->backend()->convert_expression(bt, bexpr, this->location()); | |
e440a328 | 14708 | } |
14709 | ||
d751bb78 | 14710 | // Dump ast representation for a type guard expression. |
14711 | ||
14712 | void | |
2c809f8f | 14713 | Type_guard_expression::do_dump_expression(Ast_dump_context* ast_dump_context) |
d751bb78 | 14714 | const |
14715 | { | |
14716 | this->expr_->dump_expression(ast_dump_context); | |
14717 | ast_dump_context->ostream() << "."; | |
14718 | ast_dump_context->dump_type(this->type_); | |
14719 | } | |
14720 | ||
e440a328 | 14721 | // Make a type guard expression. |
14722 | ||
14723 | Expression* | |
14724 | Expression::make_type_guard(Expression* expr, Type* type, | |
b13c66cd | 14725 | Location location) |
e440a328 | 14726 | { |
14727 | return new Type_guard_expression(expr, type, location); | |
14728 | } | |
14729 | ||
2c809f8f | 14730 | // Class Heap_expression. |
e440a328 | 14731 | |
da244e59 | 14732 | // Return the type of the expression stored on the heap. |
e440a328 | 14733 | |
da244e59 | 14734 | Type* |
14735 | Heap_expression::do_type() | |
14736 | { return Type::make_pointer_type(this->expr_->type()); } | |
e440a328 | 14737 | |
ea664253 | 14738 | // Return the backend representation for allocating an expression on the heap. |
e440a328 | 14739 | |
ea664253 | 14740 | Bexpression* |
14741 | Heap_expression::do_get_backend(Translate_context* context) | |
e440a328 | 14742 | { |
03118c21 | 14743 | Type* etype = this->expr_->type(); |
14744 | if (this->expr_->is_error_expression() || etype->is_error()) | |
ea664253 | 14745 | return context->backend()->error_expression(); |
2c809f8f | 14746 | |
02c19a1a | 14747 | Location loc = this->location(); |
2c809f8f | 14748 | Gogo* gogo = context->gogo(); |
02c19a1a | 14749 | Btype* btype = this->type()->get_backend(gogo); |
45ff893b | 14750 | |
03118c21 | 14751 | Expression* alloc = Expression::make_allocation(etype, loc); |
5973ede0 | 14752 | if (this->allocate_on_stack_) |
45ff893b | 14753 | alloc->allocation_expression()->set_allocate_on_stack(); |
14754 | Bexpression* space = alloc->get_backend(context); | |
02c19a1a | 14755 | |
14756 | Bstatement* decl; | |
14757 | Named_object* fn = context->function(); | |
14758 | go_assert(fn != NULL); | |
14759 | Bfunction* fndecl = fn->func_value()->get_or_make_decl(gogo, fn); | |
14760 | Bvariable* space_temp = | |
14761 | gogo->backend()->temporary_variable(fndecl, context->bblock(), btype, | |
14762 | space, true, loc, &decl); | |
03118c21 | 14763 | Btype* expr_btype = etype->get_backend(gogo); |
02c19a1a | 14764 | |
ea664253 | 14765 | Bexpression* bexpr = this->expr_->get_backend(context); |
03118c21 | 14766 | |
14767 | // If this assignment needs a write barrier, call typedmemmove. We | |
14768 | // don't do this in the write barrier pass because in some cases | |
14769 | // backend conversion can introduce new Heap_expression values. | |
14770 | Bstatement* assn; | |
06e83d10 | 14771 | if (!etype->has_pointer() || this->allocate_on_stack_) |
03118c21 | 14772 | { |
7af8e400 | 14773 | space = gogo->backend()->var_expression(space_temp, loc); |
03118c21 | 14774 | Bexpression* ref = |
14775 | gogo->backend()->indirect_expression(expr_btype, space, true, loc); | |
14776 | assn = gogo->backend()->assignment_statement(fndecl, ref, bexpr, loc); | |
14777 | } | |
14778 | else | |
14779 | { | |
14780 | Bstatement* edecl; | |
14781 | Bvariable* btemp = | |
14782 | gogo->backend()->temporary_variable(fndecl, context->bblock(), | |
14783 | expr_btype, bexpr, true, loc, | |
14784 | &edecl); | |
14785 | Bexpression* btempref = gogo->backend()->var_expression(btemp, | |
7af8e400 | 14786 | loc); |
03118c21 | 14787 | Bexpression* addr = gogo->backend()->address_expression(btempref, loc); |
14788 | ||
14789 | Expression* td = Expression::make_type_descriptor(etype, loc); | |
14790 | Type* etype_ptr = Type::make_pointer_type(etype); | |
7af8e400 | 14791 | space = gogo->backend()->var_expression(space_temp, loc); |
03118c21 | 14792 | Expression* elhs = Expression::make_backend(space, etype_ptr, loc); |
14793 | Expression* erhs = Expression::make_backend(addr, etype_ptr, loc); | |
14794 | Expression* call = Runtime::make_call(Runtime::TYPEDMEMMOVE, loc, 3, | |
14795 | td, elhs, erhs); | |
14796 | Bexpression* bcall = call->get_backend(context); | |
14797 | Bstatement* s = gogo->backend()->expression_statement(fndecl, bcall); | |
14798 | assn = gogo->backend()->compound_statement(edecl, s); | |
14799 | } | |
02c19a1a | 14800 | decl = gogo->backend()->compound_statement(decl, assn); |
7af8e400 | 14801 | space = gogo->backend()->var_expression(space_temp, loc); |
ea664253 | 14802 | return gogo->backend()->compound_expression(decl, space, loc); |
e440a328 | 14803 | } |
14804 | ||
2c809f8f | 14805 | // Dump ast representation for a heap expression. |
d751bb78 | 14806 | |
14807 | void | |
2c809f8f | 14808 | Heap_expression::do_dump_expression( |
d751bb78 | 14809 | Ast_dump_context* ast_dump_context) const |
14810 | { | |
14811 | ast_dump_context->ostream() << "&("; | |
14812 | ast_dump_context->dump_expression(this->expr_); | |
14813 | ast_dump_context->ostream() << ")"; | |
14814 | } | |
14815 | ||
2c809f8f | 14816 | // Allocate an expression on the heap. |
e440a328 | 14817 | |
14818 | Expression* | |
2c809f8f | 14819 | Expression::make_heap_expression(Expression* expr, Location location) |
e440a328 | 14820 | { |
2c809f8f | 14821 | return new Heap_expression(expr, location); |
e440a328 | 14822 | } |
14823 | ||
14824 | // Class Receive_expression. | |
14825 | ||
14826 | // Return the type of a receive expression. | |
14827 | ||
14828 | Type* | |
14829 | Receive_expression::do_type() | |
14830 | { | |
e429e3bd | 14831 | if (this->is_error_expression()) |
14832 | return Type::make_error_type(); | |
e440a328 | 14833 | Channel_type* channel_type = this->channel_->type()->channel_type(); |
14834 | if (channel_type == NULL) | |
e429e3bd | 14835 | { |
14836 | this->report_error(_("expected channel")); | |
14837 | return Type::make_error_type(); | |
14838 | } | |
e440a328 | 14839 | return channel_type->element_type(); |
14840 | } | |
14841 | ||
14842 | // Check types for a receive expression. | |
14843 | ||
14844 | void | |
14845 | Receive_expression::do_check_types(Gogo*) | |
14846 | { | |
14847 | Type* type = this->channel_->type(); | |
5c13bd80 | 14848 | if (type->is_error()) |
e440a328 | 14849 | { |
e429e3bd | 14850 | go_assert(saw_errors()); |
e440a328 | 14851 | this->set_is_error(); |
14852 | return; | |
14853 | } | |
14854 | if (type->channel_type() == NULL) | |
14855 | { | |
14856 | this->report_error(_("expected channel")); | |
14857 | return; | |
14858 | } | |
14859 | if (!type->channel_type()->may_receive()) | |
14860 | { | |
14861 | this->report_error(_("invalid receive on send-only channel")); | |
14862 | return; | |
14863 | } | |
14864 | } | |
14865 | ||
2c809f8f | 14866 | // Flattening for receive expressions creates a temporary variable to store |
14867 | // received data in for receives. | |
14868 | ||
14869 | Expression* | |
14870 | Receive_expression::do_flatten(Gogo*, Named_object*, | |
14871 | Statement_inserter* inserter) | |
14872 | { | |
14873 | Channel_type* channel_type = this->channel_->type()->channel_type(); | |
14874 | if (channel_type == NULL) | |
14875 | { | |
14876 | go_assert(saw_errors()); | |
14877 | return this; | |
14878 | } | |
5bf8be8b | 14879 | else if (this->channel_->is_error_expression()) |
14880 | { | |
14881 | go_assert(saw_errors()); | |
14882 | return Expression::make_error(this->location()); | |
14883 | } | |
2c809f8f | 14884 | |
14885 | Type* element_type = channel_type->element_type(); | |
14886 | if (this->temp_receiver_ == NULL) | |
14887 | { | |
14888 | this->temp_receiver_ = Statement::make_temporary(element_type, NULL, | |
14889 | this->location()); | |
14890 | this->temp_receiver_->set_is_address_taken(); | |
14891 | inserter->insert(this->temp_receiver_); | |
14892 | } | |
14893 | ||
14894 | return this; | |
14895 | } | |
14896 | ||
ea664253 | 14897 | // Get the backend representation for a receive expression. |
e440a328 | 14898 | |
ea664253 | 14899 | Bexpression* |
14900 | Receive_expression::do_get_backend(Translate_context* context) | |
e440a328 | 14901 | { |
f24f10bb | 14902 | Location loc = this->location(); |
14903 | ||
e440a328 | 14904 | Channel_type* channel_type = this->channel_->type()->channel_type(); |
5b8368f4 | 14905 | if (channel_type == NULL) |
14906 | { | |
c484d925 | 14907 | go_assert(this->channel_->type()->is_error()); |
ea664253 | 14908 | return context->backend()->error_expression(); |
5b8368f4 | 14909 | } |
e440a328 | 14910 | |
2c809f8f | 14911 | Expression* recv_ref = |
14912 | Expression::make_temporary_reference(this->temp_receiver_, loc); | |
14913 | Expression* recv_addr = | |
14914 | Expression::make_temporary_reference(this->temp_receiver_, loc); | |
14915 | recv_addr = Expression::make_unary(OPERATOR_AND, recv_addr, loc); | |
e36a5ff5 | 14916 | Expression* recv = Runtime::make_call(Runtime::CHANRECV1, loc, 2, |
14917 | this->channel_, recv_addr); | |
ea664253 | 14918 | return Expression::make_compound(recv, recv_ref, loc)->get_backend(context); |
e440a328 | 14919 | } |
14920 | ||
d751bb78 | 14921 | // Dump ast representation for a receive expression. |
14922 | ||
14923 | void | |
14924 | Receive_expression::do_dump_expression(Ast_dump_context* ast_dump_context) const | |
14925 | { | |
14926 | ast_dump_context->ostream() << " <- " ; | |
14927 | ast_dump_context->dump_expression(channel_); | |
14928 | } | |
14929 | ||
e440a328 | 14930 | // Make a receive expression. |
14931 | ||
14932 | Receive_expression* | |
b13c66cd | 14933 | Expression::make_receive(Expression* channel, Location location) |
e440a328 | 14934 | { |
14935 | return new Receive_expression(channel, location); | |
14936 | } | |
14937 | ||
e440a328 | 14938 | // An expression which evaluates to a pointer to the type descriptor |
14939 | // of a type. | |
14940 | ||
14941 | class Type_descriptor_expression : public Expression | |
14942 | { | |
14943 | public: | |
b13c66cd | 14944 | Type_descriptor_expression(Type* type, Location location) |
e440a328 | 14945 | : Expression(EXPRESSION_TYPE_DESCRIPTOR, location), |
14946 | type_(type) | |
14947 | { } | |
14948 | ||
14949 | protected: | |
4b686186 | 14950 | int |
14951 | do_traverse(Traverse*); | |
14952 | ||
e440a328 | 14953 | Type* |
14954 | do_type() | |
14955 | { return Type::make_type_descriptor_ptr_type(); } | |
14956 | ||
f9ca30f9 | 14957 | bool |
3ae06f68 | 14958 | do_is_static_initializer() const |
f9ca30f9 | 14959 | { return true; } |
14960 | ||
e440a328 | 14961 | void |
14962 | do_determine_type(const Type_context*) | |
14963 | { } | |
14964 | ||
14965 | Expression* | |
14966 | do_copy() | |
14967 | { return this; } | |
14968 | ||
ea664253 | 14969 | Bexpression* |
14970 | do_get_backend(Translate_context* context) | |
a1d23b41 | 14971 | { |
ea664253 | 14972 | return this->type_->type_descriptor_pointer(context->gogo(), |
14973 | this->location()); | |
a1d23b41 | 14974 | } |
e440a328 | 14975 | |
d751bb78 | 14976 | void |
14977 | do_dump_expression(Ast_dump_context*) const; | |
14978 | ||
e440a328 | 14979 | private: |
14980 | // The type for which this is the descriptor. | |
14981 | Type* type_; | |
14982 | }; | |
14983 | ||
4b686186 | 14984 | int |
14985 | Type_descriptor_expression::do_traverse(Traverse* traverse) | |
14986 | { | |
14987 | if (Type::traverse(this->type_, traverse) == TRAVERSE_EXIT) | |
14988 | return TRAVERSE_EXIT; | |
14989 | return TRAVERSE_CONTINUE; | |
14990 | } | |
14991 | ||
d751bb78 | 14992 | // Dump ast representation for a type descriptor expression. |
14993 | ||
14994 | void | |
14995 | Type_descriptor_expression::do_dump_expression( | |
14996 | Ast_dump_context* ast_dump_context) const | |
14997 | { | |
14998 | ast_dump_context->dump_type(this->type_); | |
14999 | } | |
15000 | ||
e440a328 | 15001 | // Make a type descriptor expression. |
15002 | ||
15003 | Expression* | |
b13c66cd | 15004 | Expression::make_type_descriptor(Type* type, Location location) |
e440a328 | 15005 | { |
15006 | return new Type_descriptor_expression(type, location); | |
15007 | } | |
15008 | ||
aa5ae575 | 15009 | // An expression which evaluates to a pointer to the Garbage Collection symbol |
15010 | // of a type. | |
15011 | ||
15012 | class GC_symbol_expression : public Expression | |
15013 | { | |
15014 | public: | |
15015 | GC_symbol_expression(Type* type) | |
15016 | : Expression(EXPRESSION_GC_SYMBOL, Linemap::predeclared_location()), | |
15017 | type_(type) | |
15018 | {} | |
15019 | ||
15020 | protected: | |
15021 | Type* | |
15022 | do_type() | |
03118c21 | 15023 | { return Type::make_pointer_type(Type::lookup_integer_type("uint8")); } |
aa5ae575 | 15024 | |
15025 | bool | |
3ae06f68 | 15026 | do_is_static_initializer() const |
aa5ae575 | 15027 | { return true; } |
15028 | ||
15029 | void | |
15030 | do_determine_type(const Type_context*) | |
15031 | { } | |
15032 | ||
15033 | Expression* | |
15034 | do_copy() | |
15035 | { return this; } | |
15036 | ||
15037 | Bexpression* | |
15038 | do_get_backend(Translate_context* context) | |
15039 | { return this->type_->gc_symbol_pointer(context->gogo()); } | |
15040 | ||
15041 | void | |
15042 | do_dump_expression(Ast_dump_context*) const; | |
15043 | ||
15044 | private: | |
15045 | // The type which this gc symbol describes. | |
15046 | Type* type_; | |
15047 | }; | |
15048 | ||
15049 | // Dump ast representation for a gc symbol expression. | |
15050 | ||
15051 | void | |
15052 | GC_symbol_expression::do_dump_expression( | |
15053 | Ast_dump_context* ast_dump_context) const | |
15054 | { | |
15055 | ast_dump_context->ostream() << "gcdata("; | |
15056 | ast_dump_context->dump_type(this->type_); | |
15057 | ast_dump_context->ostream() << ")"; | |
15058 | } | |
15059 | ||
15060 | // Make a gc symbol expression. | |
15061 | ||
15062 | Expression* | |
15063 | Expression::make_gc_symbol(Type* type) | |
15064 | { | |
15065 | return new GC_symbol_expression(type); | |
15066 | } | |
15067 | ||
03118c21 | 15068 | // An expression that evaluates to a pointer to a symbol holding the |
15069 | // ptrmask data of a type. | |
15070 | ||
15071 | class Ptrmask_symbol_expression : public Expression | |
15072 | { | |
15073 | public: | |
15074 | Ptrmask_symbol_expression(Type* type) | |
15075 | : Expression(EXPRESSION_PTRMASK_SYMBOL, Linemap::predeclared_location()), | |
15076 | type_(type) | |
15077 | {} | |
15078 | ||
15079 | protected: | |
15080 | Type* | |
15081 | do_type() | |
15082 | { return Type::make_pointer_type(Type::lookup_integer_type("uint8")); } | |
15083 | ||
15084 | bool | |
15085 | do_is_static_initializer() const | |
15086 | { return true; } | |
15087 | ||
15088 | void | |
15089 | do_determine_type(const Type_context*) | |
15090 | { } | |
15091 | ||
15092 | Expression* | |
15093 | do_copy() | |
15094 | { return this; } | |
15095 | ||
15096 | Bexpression* | |
15097 | do_get_backend(Translate_context*); | |
15098 | ||
15099 | void | |
15100 | do_dump_expression(Ast_dump_context*) const; | |
15101 | ||
15102 | private: | |
15103 | // The type that this ptrmask symbol describes. | |
15104 | Type* type_; | |
15105 | }; | |
15106 | ||
15107 | // Return the ptrmask variable. | |
15108 | ||
15109 | Bexpression* | |
15110 | Ptrmask_symbol_expression::do_get_backend(Translate_context* context) | |
15111 | { | |
15112 | Gogo* gogo = context->gogo(); | |
15113 | ||
15114 | // If this type does not need a gcprog, then we can use the standard | |
15115 | // GC symbol. | |
15116 | int64_t ptrsize, ptrdata; | |
15117 | if (!this->type_->needs_gcprog(gogo, &ptrsize, &ptrdata)) | |
15118 | return this->type_->gc_symbol_pointer(gogo); | |
15119 | ||
15120 | // Otherwise we have to build a ptrmask variable, and return a | |
15121 | // pointer to it. | |
15122 | ||
15123 | Bvariable* bvar = this->type_->gc_ptrmask_var(gogo, ptrsize, ptrdata); | |
15124 | Location bloc = Linemap::predeclared_location(); | |
7af8e400 | 15125 | Bexpression* bref = gogo->backend()->var_expression(bvar, bloc); |
03118c21 | 15126 | Bexpression* baddr = gogo->backend()->address_expression(bref, bloc); |
15127 | ||
15128 | Type* uint8_type = Type::lookup_integer_type("uint8"); | |
15129 | Type* pointer_uint8_type = Type::make_pointer_type(uint8_type); | |
15130 | Btype* ubtype = pointer_uint8_type->get_backend(gogo); | |
15131 | return gogo->backend()->convert_expression(ubtype, baddr, bloc); | |
15132 | } | |
15133 | ||
15134 | // Dump AST for a ptrmask symbol expression. | |
15135 | ||
15136 | void | |
15137 | Ptrmask_symbol_expression::do_dump_expression( | |
15138 | Ast_dump_context* ast_dump_context) const | |
15139 | { | |
15140 | ast_dump_context->ostream() << "ptrmask("; | |
15141 | ast_dump_context->dump_type(this->type_); | |
15142 | ast_dump_context->ostream() << ")"; | |
15143 | } | |
15144 | ||
15145 | // Make a ptrmask symbol expression. | |
15146 | ||
15147 | Expression* | |
15148 | Expression::make_ptrmask_symbol(Type* type) | |
15149 | { | |
15150 | return new Ptrmask_symbol_expression(type); | |
15151 | } | |
15152 | ||
e440a328 | 15153 | // An expression which evaluates to some characteristic of a type. |
15154 | // This is only used to initialize fields of a type descriptor. Using | |
15155 | // a new expression class is slightly inefficient but gives us a good | |
15156 | // separation between the frontend and the middle-end with regard to | |
15157 | // how types are laid out. | |
15158 | ||
15159 | class Type_info_expression : public Expression | |
15160 | { | |
15161 | public: | |
15162 | Type_info_expression(Type* type, Type_info type_info) | |
b13c66cd | 15163 | : Expression(EXPRESSION_TYPE_INFO, Linemap::predeclared_location()), |
e440a328 | 15164 | type_(type), type_info_(type_info) |
15165 | { } | |
15166 | ||
15167 | protected: | |
0e168074 | 15168 | bool |
3ae06f68 | 15169 | do_is_static_initializer() const |
0e168074 | 15170 | { return true; } |
15171 | ||
e440a328 | 15172 | Type* |
15173 | do_type(); | |
15174 | ||
15175 | void | |
15176 | do_determine_type(const Type_context*) | |
15177 | { } | |
15178 | ||
15179 | Expression* | |
15180 | do_copy() | |
15181 | { return this; } | |
15182 | ||
ea664253 | 15183 | Bexpression* |
15184 | do_get_backend(Translate_context* context); | |
e440a328 | 15185 | |
d751bb78 | 15186 | void |
15187 | do_dump_expression(Ast_dump_context*) const; | |
15188 | ||
e440a328 | 15189 | private: |
15190 | // The type for which we are getting information. | |
15191 | Type* type_; | |
15192 | // What information we want. | |
15193 | Type_info type_info_; | |
15194 | }; | |
15195 | ||
15196 | // The type is chosen to match what the type descriptor struct | |
15197 | // expects. | |
15198 | ||
15199 | Type* | |
15200 | Type_info_expression::do_type() | |
15201 | { | |
15202 | switch (this->type_info_) | |
15203 | { | |
15204 | case TYPE_INFO_SIZE: | |
03118c21 | 15205 | case TYPE_INFO_BACKEND_PTRDATA: |
15206 | case TYPE_INFO_DESCRIPTOR_PTRDATA: | |
e440a328 | 15207 | return Type::lookup_integer_type("uintptr"); |
15208 | case TYPE_INFO_ALIGNMENT: | |
15209 | case TYPE_INFO_FIELD_ALIGNMENT: | |
15210 | return Type::lookup_integer_type("uint8"); | |
15211 | default: | |
c3e6f413 | 15212 | go_unreachable(); |
e440a328 | 15213 | } |
15214 | } | |
15215 | ||
ea664253 | 15216 | // Return the backend representation for type information. |
e440a328 | 15217 | |
ea664253 | 15218 | Bexpression* |
15219 | Type_info_expression::do_get_backend(Translate_context* context) | |
e440a328 | 15220 | { |
927a01eb | 15221 | Gogo* gogo = context->gogo(); |
2a305b85 | 15222 | bool ok = true; |
3f378015 | 15223 | int64_t val; |
927a01eb | 15224 | switch (this->type_info_) |
e440a328 | 15225 | { |
927a01eb | 15226 | case TYPE_INFO_SIZE: |
2a305b85 | 15227 | ok = this->type_->backend_type_size(gogo, &val); |
927a01eb | 15228 | break; |
15229 | case TYPE_INFO_ALIGNMENT: | |
2a305b85 | 15230 | ok = this->type_->backend_type_align(gogo, &val); |
927a01eb | 15231 | break; |
15232 | case TYPE_INFO_FIELD_ALIGNMENT: | |
2a305b85 | 15233 | ok = this->type_->backend_type_field_align(gogo, &val); |
927a01eb | 15234 | break; |
03118c21 | 15235 | case TYPE_INFO_BACKEND_PTRDATA: |
15236 | ok = this->type_->backend_type_ptrdata(gogo, &val); | |
15237 | break; | |
15238 | case TYPE_INFO_DESCRIPTOR_PTRDATA: | |
15239 | ok = this->type_->descriptor_ptrdata(gogo, &val); | |
15240 | break; | |
927a01eb | 15241 | default: |
15242 | go_unreachable(); | |
e440a328 | 15243 | } |
2a305b85 | 15244 | if (!ok) |
15245 | { | |
15246 | go_assert(saw_errors()); | |
15247 | return gogo->backend()->error_expression(); | |
15248 | } | |
3f378015 | 15249 | Expression* e = Expression::make_integer_int64(val, this->type(), |
15250 | this->location()); | |
15251 | return e->get_backend(context); | |
e440a328 | 15252 | } |
15253 | ||
d751bb78 | 15254 | // Dump ast representation for a type info expression. |
15255 | ||
15256 | void | |
15257 | Type_info_expression::do_dump_expression( | |
15258 | Ast_dump_context* ast_dump_context) const | |
15259 | { | |
15260 | ast_dump_context->ostream() << "typeinfo("; | |
15261 | ast_dump_context->dump_type(this->type_); | |
15262 | ast_dump_context->ostream() << ","; | |
15263 | ast_dump_context->ostream() << | |
15264 | (this->type_info_ == TYPE_INFO_ALIGNMENT ? "alignment" | |
15265 | : this->type_info_ == TYPE_INFO_FIELD_ALIGNMENT ? "field alignment" | |
03118c21 | 15266 | : this->type_info_ == TYPE_INFO_SIZE ? "size" |
15267 | : this->type_info_ == TYPE_INFO_BACKEND_PTRDATA ? "backend_ptrdata" | |
15268 | : this->type_info_ == TYPE_INFO_DESCRIPTOR_PTRDATA ? "descriptor_ptrdata" | |
d751bb78 | 15269 | : "unknown"); |
15270 | ast_dump_context->ostream() << ")"; | |
15271 | } | |
15272 | ||
e440a328 | 15273 | // Make a type info expression. |
15274 | ||
15275 | Expression* | |
15276 | Expression::make_type_info(Type* type, Type_info type_info) | |
15277 | { | |
15278 | return new Type_info_expression(type, type_info); | |
15279 | } | |
15280 | ||
35a54f17 | 15281 | // An expression that evaluates to some characteristic of a slice. |
15282 | // This is used when indexing, bound-checking, or nil checking a slice. | |
15283 | ||
15284 | class Slice_info_expression : public Expression | |
15285 | { | |
15286 | public: | |
15287 | Slice_info_expression(Expression* slice, Slice_info slice_info, | |
15288 | Location location) | |
15289 | : Expression(EXPRESSION_SLICE_INFO, location), | |
15290 | slice_(slice), slice_info_(slice_info) | |
15291 | { } | |
15292 | ||
15293 | protected: | |
15294 | Type* | |
15295 | do_type(); | |
15296 | ||
15297 | void | |
15298 | do_determine_type(const Type_context*) | |
15299 | { } | |
15300 | ||
15301 | Expression* | |
15302 | do_copy() | |
15303 | { | |
15304 | return new Slice_info_expression(this->slice_->copy(), this->slice_info_, | |
15305 | this->location()); | |
15306 | } | |
15307 | ||
ea664253 | 15308 | Bexpression* |
15309 | do_get_backend(Translate_context* context); | |
35a54f17 | 15310 | |
15311 | void | |
15312 | do_dump_expression(Ast_dump_context*) const; | |
15313 | ||
15314 | void | |
15315 | do_issue_nil_check() | |
15316 | { this->slice_->issue_nil_check(); } | |
15317 | ||
15318 | private: | |
15319 | // The slice for which we are getting information. | |
15320 | Expression* slice_; | |
15321 | // What information we want. | |
15322 | Slice_info slice_info_; | |
15323 | }; | |
15324 | ||
15325 | // Return the type of the slice info. | |
15326 | ||
15327 | Type* | |
15328 | Slice_info_expression::do_type() | |
15329 | { | |
15330 | switch (this->slice_info_) | |
15331 | { | |
15332 | case SLICE_INFO_VALUE_POINTER: | |
15333 | return Type::make_pointer_type( | |
15334 | this->slice_->type()->array_type()->element_type()); | |
15335 | case SLICE_INFO_LENGTH: | |
15336 | case SLICE_INFO_CAPACITY: | |
15337 | return Type::lookup_integer_type("int"); | |
15338 | default: | |
15339 | go_unreachable(); | |
15340 | } | |
15341 | } | |
15342 | ||
ea664253 | 15343 | // Return the backend information for slice information. |
35a54f17 | 15344 | |
ea664253 | 15345 | Bexpression* |
15346 | Slice_info_expression::do_get_backend(Translate_context* context) | |
35a54f17 | 15347 | { |
15348 | Gogo* gogo = context->gogo(); | |
ea664253 | 15349 | Bexpression* bslice = this->slice_->get_backend(context); |
35a54f17 | 15350 | switch (this->slice_info_) |
15351 | { | |
15352 | case SLICE_INFO_VALUE_POINTER: | |
15353 | case SLICE_INFO_LENGTH: | |
15354 | case SLICE_INFO_CAPACITY: | |
ea664253 | 15355 | return gogo->backend()->struct_field_expression(bslice, this->slice_info_, |
15356 | this->location()); | |
35a54f17 | 15357 | break; |
15358 | default: | |
15359 | go_unreachable(); | |
15360 | } | |
35a54f17 | 15361 | } |
15362 | ||
15363 | // Dump ast representation for a type info expression. | |
15364 | ||
15365 | void | |
15366 | Slice_info_expression::do_dump_expression( | |
15367 | Ast_dump_context* ast_dump_context) const | |
15368 | { | |
15369 | ast_dump_context->ostream() << "sliceinfo("; | |
15370 | this->slice_->dump_expression(ast_dump_context); | |
15371 | ast_dump_context->ostream() << ","; | |
15372 | ast_dump_context->ostream() << | |
15373 | (this->slice_info_ == SLICE_INFO_VALUE_POINTER ? "values" | |
15374 | : this->slice_info_ == SLICE_INFO_LENGTH ? "length" | |
15375 | : this->slice_info_ == SLICE_INFO_CAPACITY ? "capacity " | |
15376 | : "unknown"); | |
15377 | ast_dump_context->ostream() << ")"; | |
15378 | } | |
15379 | ||
15380 | // Make a slice info expression. | |
15381 | ||
15382 | Expression* | |
15383 | Expression::make_slice_info(Expression* slice, Slice_info slice_info, | |
15384 | Location location) | |
15385 | { | |
15386 | return new Slice_info_expression(slice, slice_info, location); | |
15387 | } | |
15388 | ||
d633d0fb | 15389 | // Class Slice_value_expression. |
2c809f8f | 15390 | |
15391 | int | |
15392 | Slice_value_expression::do_traverse(Traverse* traverse) | |
15393 | { | |
55e8ba6a | 15394 | if (Type::traverse(this->type_, traverse) == TRAVERSE_EXIT |
d633d0fb | 15395 | || Expression::traverse(&this->valmem_, traverse) == TRAVERSE_EXIT |
2c809f8f | 15396 | || Expression::traverse(&this->len_, traverse) == TRAVERSE_EXIT |
15397 | || Expression::traverse(&this->cap_, traverse) == TRAVERSE_EXIT) | |
15398 | return TRAVERSE_EXIT; | |
15399 | return TRAVERSE_CONTINUE; | |
15400 | } | |
15401 | ||
d633d0fb | 15402 | Expression* |
15403 | Slice_value_expression::do_copy() | |
15404 | { | |
15405 | return new Slice_value_expression(this->type_->copy_expressions(), | |
15406 | this->valmem_->copy(), | |
15407 | this->len_->copy(), this->cap_->copy(), | |
15408 | this->location()); | |
15409 | } | |
15410 | ||
ea664253 | 15411 | Bexpression* |
15412 | Slice_value_expression::do_get_backend(Translate_context* context) | |
2c809f8f | 15413 | { |
15414 | std::vector<Bexpression*> vals(3); | |
d633d0fb | 15415 | vals[0] = this->valmem_->get_backend(context); |
ea664253 | 15416 | vals[1] = this->len_->get_backend(context); |
15417 | vals[2] = this->cap_->get_backend(context); | |
2c809f8f | 15418 | |
15419 | Gogo* gogo = context->gogo(); | |
15420 | Btype* btype = this->type_->get_backend(gogo); | |
ea664253 | 15421 | return gogo->backend()->constructor_expression(btype, vals, this->location()); |
2c809f8f | 15422 | } |
15423 | ||
15424 | void | |
15425 | Slice_value_expression::do_dump_expression( | |
15426 | Ast_dump_context* ast_dump_context) const | |
15427 | { | |
15428 | ast_dump_context->ostream() << "slicevalue("; | |
15429 | ast_dump_context->ostream() << "values: "; | |
d633d0fb | 15430 | this->valmem_->dump_expression(ast_dump_context); |
2c809f8f | 15431 | ast_dump_context->ostream() << ", length: "; |
15432 | this->len_->dump_expression(ast_dump_context); | |
15433 | ast_dump_context->ostream() << ", capacity: "; | |
15434 | this->cap_->dump_expression(ast_dump_context); | |
15435 | ast_dump_context->ostream() << ")"; | |
15436 | } | |
15437 | ||
15438 | Expression* | |
d633d0fb | 15439 | Expression::make_slice_value(Type* at, Expression* valmem, Expression* len, |
2c809f8f | 15440 | Expression* cap, Location location) |
15441 | { | |
15442 | go_assert(at->is_slice_type()); | |
d633d0fb | 15443 | go_assert(valmem->is_nil_expression() |
15444 | || (at->array_type()->element_type() | |
15445 | == valmem->type()->points_to())); | |
15446 | return new Slice_value_expression(at, valmem, len, cap, location); | |
2c809f8f | 15447 | } |
2387f644 | 15448 | |
15449 | // An expression that evaluates to some characteristic of a non-empty interface. | |
15450 | // This is used to access the method table or underlying object of an interface. | |
15451 | ||
15452 | class Interface_info_expression : public Expression | |
15453 | { | |
15454 | public: | |
15455 | Interface_info_expression(Expression* iface, Interface_info iface_info, | |
2c809f8f | 15456 | Location location) |
2387f644 | 15457 | : Expression(EXPRESSION_INTERFACE_INFO, location), |
15458 | iface_(iface), iface_info_(iface_info) | |
15459 | { } | |
15460 | ||
15461 | protected: | |
15462 | Type* | |
15463 | do_type(); | |
15464 | ||
15465 | void | |
15466 | do_determine_type(const Type_context*) | |
15467 | { } | |
15468 | ||
15469 | Expression* | |
15470 | do_copy() | |
15471 | { | |
15472 | return new Interface_info_expression(this->iface_->copy(), | |
15473 | this->iface_info_, this->location()); | |
15474 | } | |
15475 | ||
ea664253 | 15476 | Bexpression* |
15477 | do_get_backend(Translate_context* context); | |
2387f644 | 15478 | |
15479 | void | |
15480 | do_dump_expression(Ast_dump_context*) const; | |
15481 | ||
15482 | void | |
15483 | do_issue_nil_check() | |
15484 | { this->iface_->issue_nil_check(); } | |
15485 | ||
15486 | private: | |
15487 | // The interface for which we are getting information. | |
15488 | Expression* iface_; | |
15489 | // What information we want. | |
15490 | Interface_info iface_info_; | |
15491 | }; | |
15492 | ||
15493 | // Return the type of the interface info. | |
15494 | ||
15495 | Type* | |
15496 | Interface_info_expression::do_type() | |
15497 | { | |
15498 | switch (this->iface_info_) | |
15499 | { | |
15500 | case INTERFACE_INFO_METHODS: | |
15501 | { | |
625d3118 | 15502 | typedef Unordered_map(Interface_type*, Type*) Hashtable; |
15503 | static Hashtable result_types; | |
15504 | ||
15505 | Interface_type* itype = this->iface_->type()->interface_type(); | |
15506 | ||
15507 | Hashtable::const_iterator p = result_types.find(itype); | |
15508 | if (p != result_types.end()) | |
15509 | return p->second; | |
15510 | ||
2c809f8f | 15511 | Type* pdt = Type::make_type_descriptor_ptr_type(); |
625d3118 | 15512 | if (itype->is_empty()) |
15513 | { | |
15514 | result_types[itype] = pdt; | |
15515 | return pdt; | |
15516 | } | |
2c809f8f | 15517 | |
2387f644 | 15518 | Location loc = this->location(); |
15519 | Struct_field_list* sfl = new Struct_field_list(); | |
2387f644 | 15520 | sfl->push_back( |
15521 | Struct_field(Typed_identifier("__type_descriptor", pdt, loc))); | |
15522 | ||
2387f644 | 15523 | for (Typed_identifier_list::const_iterator p = itype->methods()->begin(); |
15524 | p != itype->methods()->end(); | |
15525 | ++p) | |
15526 | { | |
15527 | Function_type* ft = p->type()->function_type(); | |
15528 | go_assert(ft->receiver() == NULL); | |
15529 | ||
15530 | const Typed_identifier_list* params = ft->parameters(); | |
15531 | Typed_identifier_list* mparams = new Typed_identifier_list(); | |
15532 | if (params != NULL) | |
15533 | mparams->reserve(params->size() + 1); | |
15534 | Type* vt = Type::make_pointer_type(Type::make_void_type()); | |
15535 | mparams->push_back(Typed_identifier("", vt, ft->location())); | |
15536 | if (params != NULL) | |
15537 | { | |
15538 | for (Typed_identifier_list::const_iterator pp = params->begin(); | |
15539 | pp != params->end(); | |
15540 | ++pp) | |
15541 | mparams->push_back(*pp); | |
15542 | } | |
15543 | ||
15544 | Typed_identifier_list* mresults = (ft->results() == NULL | |
15545 | ? NULL | |
15546 | : ft->results()->copy()); | |
15547 | Backend_function_type* mft = | |
15548 | Type::make_backend_function_type(NULL, mparams, mresults, | |
15549 | ft->location()); | |
15550 | ||
15551 | std::string fname = Gogo::unpack_hidden_name(p->name()); | |
15552 | sfl->push_back(Struct_field(Typed_identifier(fname, mft, loc))); | |
15553 | } | |
15554 | ||
6bf4793c | 15555 | Struct_type* st = Type::make_struct_type(sfl, loc); |
15556 | st->set_is_struct_incomparable(); | |
15557 | Pointer_type *pt = Type::make_pointer_type(st); | |
625d3118 | 15558 | result_types[itype] = pt; |
15559 | return pt; | |
2387f644 | 15560 | } |
15561 | case INTERFACE_INFO_OBJECT: | |
15562 | return Type::make_pointer_type(Type::make_void_type()); | |
15563 | default: | |
15564 | go_unreachable(); | |
15565 | } | |
15566 | } | |
15567 | ||
ea664253 | 15568 | // Return the backend representation for interface information. |
2387f644 | 15569 | |
ea664253 | 15570 | Bexpression* |
15571 | Interface_info_expression::do_get_backend(Translate_context* context) | |
2387f644 | 15572 | { |
15573 | Gogo* gogo = context->gogo(); | |
ea664253 | 15574 | Bexpression* biface = this->iface_->get_backend(context); |
2387f644 | 15575 | switch (this->iface_info_) |
15576 | { | |
15577 | case INTERFACE_INFO_METHODS: | |
15578 | case INTERFACE_INFO_OBJECT: | |
ea664253 | 15579 | return gogo->backend()->struct_field_expression(biface, this->iface_info_, |
15580 | this->location()); | |
2387f644 | 15581 | break; |
15582 | default: | |
15583 | go_unreachable(); | |
15584 | } | |
2387f644 | 15585 | } |
15586 | ||
15587 | // Dump ast representation for an interface info expression. | |
15588 | ||
15589 | void | |
15590 | Interface_info_expression::do_dump_expression( | |
15591 | Ast_dump_context* ast_dump_context) const | |
15592 | { | |
2c809f8f | 15593 | bool is_empty = this->iface_->type()->interface_type()->is_empty(); |
2387f644 | 15594 | ast_dump_context->ostream() << "interfaceinfo("; |
15595 | this->iface_->dump_expression(ast_dump_context); | |
15596 | ast_dump_context->ostream() << ","; | |
15597 | ast_dump_context->ostream() << | |
2c809f8f | 15598 | (this->iface_info_ == INTERFACE_INFO_METHODS && !is_empty ? "methods" |
15599 | : this->iface_info_ == INTERFACE_INFO_TYPE_DESCRIPTOR ? "type_descriptor" | |
2387f644 | 15600 | : this->iface_info_ == INTERFACE_INFO_OBJECT ? "object" |
15601 | : "unknown"); | |
15602 | ast_dump_context->ostream() << ")"; | |
15603 | } | |
15604 | ||
15605 | // Make an interface info expression. | |
15606 | ||
15607 | Expression* | |
15608 | Expression::make_interface_info(Expression* iface, Interface_info iface_info, | |
15609 | Location location) | |
15610 | { | |
15611 | return new Interface_info_expression(iface, iface_info, location); | |
15612 | } | |
15613 | ||
2c809f8f | 15614 | // An expression that represents an interface value. The first field is either |
15615 | // a type descriptor for an empty interface or a pointer to the interface method | |
15616 | // table for a non-empty interface. The second field is always the object. | |
15617 | ||
15618 | class Interface_value_expression : public Expression | |
15619 | { | |
15620 | public: | |
15621 | Interface_value_expression(Type* type, Expression* first_field, | |
15622 | Expression* obj, Location location) | |
15623 | : Expression(EXPRESSION_INTERFACE_VALUE, location), | |
15624 | type_(type), first_field_(first_field), obj_(obj) | |
15625 | { } | |
15626 | ||
15627 | protected: | |
15628 | int | |
15629 | do_traverse(Traverse*); | |
15630 | ||
15631 | Type* | |
15632 | do_type() | |
15633 | { return this->type_; } | |
15634 | ||
15635 | void | |
15636 | do_determine_type(const Type_context*) | |
15637 | { go_unreachable(); } | |
15638 | ||
15639 | Expression* | |
15640 | do_copy() | |
15641 | { | |
de590a61 | 15642 | return new Interface_value_expression(this->type_->copy_expressions(), |
2c809f8f | 15643 | this->first_field_->copy(), |
15644 | this->obj_->copy(), this->location()); | |
15645 | } | |
15646 | ||
ea664253 | 15647 | Bexpression* |
15648 | do_get_backend(Translate_context* context); | |
2c809f8f | 15649 | |
15650 | void | |
15651 | do_dump_expression(Ast_dump_context*) const; | |
15652 | ||
15653 | private: | |
15654 | // The type of the interface value. | |
15655 | Type* type_; | |
15656 | // The first field of the interface (either a type descriptor or a pointer | |
15657 | // to the method table. | |
15658 | Expression* first_field_; | |
15659 | // The underlying object of the interface. | |
15660 | Expression* obj_; | |
15661 | }; | |
15662 | ||
15663 | int | |
15664 | Interface_value_expression::do_traverse(Traverse* traverse) | |
15665 | { | |
15666 | if (Expression::traverse(&this->first_field_, traverse) == TRAVERSE_EXIT | |
15667 | || Expression::traverse(&this->obj_, traverse) == TRAVERSE_EXIT) | |
15668 | return TRAVERSE_EXIT; | |
15669 | return TRAVERSE_CONTINUE; | |
15670 | } | |
15671 | ||
ea664253 | 15672 | Bexpression* |
15673 | Interface_value_expression::do_get_backend(Translate_context* context) | |
2c809f8f | 15674 | { |
15675 | std::vector<Bexpression*> vals(2); | |
ea664253 | 15676 | vals[0] = this->first_field_->get_backend(context); |
15677 | vals[1] = this->obj_->get_backend(context); | |
2c809f8f | 15678 | |
15679 | Gogo* gogo = context->gogo(); | |
15680 | Btype* btype = this->type_->get_backend(gogo); | |
ea664253 | 15681 | return gogo->backend()->constructor_expression(btype, vals, this->location()); |
2c809f8f | 15682 | } |
15683 | ||
15684 | void | |
15685 | Interface_value_expression::do_dump_expression( | |
15686 | Ast_dump_context* ast_dump_context) const | |
15687 | { | |
15688 | ast_dump_context->ostream() << "interfacevalue("; | |
15689 | ast_dump_context->ostream() << | |
15690 | (this->type_->interface_type()->is_empty() | |
15691 | ? "type_descriptor: " | |
15692 | : "methods: "); | |
15693 | this->first_field_->dump_expression(ast_dump_context); | |
15694 | ast_dump_context->ostream() << ", object: "; | |
15695 | this->obj_->dump_expression(ast_dump_context); | |
15696 | ast_dump_context->ostream() << ")"; | |
15697 | } | |
15698 | ||
15699 | Expression* | |
15700 | Expression::make_interface_value(Type* type, Expression* first_value, | |
15701 | Expression* object, Location location) | |
15702 | { | |
15703 | return new Interface_value_expression(type, first_value, object, location); | |
15704 | } | |
15705 | ||
15706 | // An interface method table for a pair of types: an interface type and a type | |
15707 | // that implements that interface. | |
15708 | ||
15709 | class Interface_mtable_expression : public Expression | |
15710 | { | |
15711 | public: | |
15712 | Interface_mtable_expression(Interface_type* itype, Type* type, | |
15713 | bool is_pointer, Location location) | |
15714 | : Expression(EXPRESSION_INTERFACE_MTABLE, location), | |
15715 | itype_(itype), type_(type), is_pointer_(is_pointer), | |
15716 | method_table_type_(NULL), bvar_(NULL) | |
15717 | { } | |
15718 | ||
15719 | protected: | |
15720 | int | |
15721 | do_traverse(Traverse*); | |
15722 | ||
15723 | Type* | |
15724 | do_type(); | |
15725 | ||
15726 | bool | |
3ae06f68 | 15727 | do_is_static_initializer() const |
2c809f8f | 15728 | { return true; } |
15729 | ||
15730 | void | |
15731 | do_determine_type(const Type_context*) | |
15732 | { go_unreachable(); } | |
15733 | ||
15734 | Expression* | |
15735 | do_copy() | |
15736 | { | |
de590a61 | 15737 | Interface_type* itype = this->itype_->copy_expressions()->interface_type(); |
15738 | return new Interface_mtable_expression(itype, | |
15739 | this->type_->copy_expressions(), | |
2c809f8f | 15740 | this->is_pointer_, this->location()); |
15741 | } | |
15742 | ||
15743 | bool | |
15744 | do_is_addressable() const | |
15745 | { return true; } | |
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 interface type for which the methods are defined. | |
15755 | Interface_type* itype_; | |
15756 | // The type to construct the interface method table for. | |
15757 | Type* type_; | |
15758 | // Whether this table contains the method set for the receiver type or the | |
15759 | // pointer receiver type. | |
15760 | bool is_pointer_; | |
15761 | // The type of the method table. | |
15762 | Type* method_table_type_; | |
15763 | // The backend variable that refers to the interface method table. | |
15764 | Bvariable* bvar_; | |
15765 | }; | |
15766 | ||
15767 | int | |
15768 | Interface_mtable_expression::do_traverse(Traverse* traverse) | |
15769 | { | |
15770 | if (Type::traverse(this->itype_, traverse) == TRAVERSE_EXIT | |
15771 | || Type::traverse(this->type_, traverse) == TRAVERSE_EXIT) | |
15772 | return TRAVERSE_EXIT; | |
15773 | return TRAVERSE_CONTINUE; | |
15774 | } | |
15775 | ||
15776 | Type* | |
15777 | Interface_mtable_expression::do_type() | |
15778 | { | |
15779 | if (this->method_table_type_ != NULL) | |
15780 | return this->method_table_type_; | |
15781 | ||
15782 | const Typed_identifier_list* interface_methods = this->itype_->methods(); | |
15783 | go_assert(!interface_methods->empty()); | |
15784 | ||
15785 | Struct_field_list* sfl = new Struct_field_list; | |
15786 | Typed_identifier tid("__type_descriptor", Type::make_type_descriptor_ptr_type(), | |
15787 | this->location()); | |
15788 | sfl->push_back(Struct_field(tid)); | |
db122cb9 | 15789 | Type* unsafe_ptr_type = Type::make_pointer_type(Type::make_void_type()); |
2c809f8f | 15790 | for (Typed_identifier_list::const_iterator p = interface_methods->begin(); |
15791 | p != interface_methods->end(); | |
15792 | ++p) | |
db122cb9 | 15793 | { |
15794 | // We want C function pointers here, not func descriptors; model | |
15795 | // using void* pointers. | |
15796 | Typed_identifier method(p->name(), unsafe_ptr_type, p->location()); | |
15797 | sfl->push_back(Struct_field(method)); | |
15798 | } | |
6bf4793c | 15799 | Struct_type* st = Type::make_struct_type(sfl, this->location()); |
15800 | st->set_is_struct_incomparable(); | |
15801 | this->method_table_type_ = st; | |
2c809f8f | 15802 | return this->method_table_type_; |
15803 | } | |
15804 | ||
ea664253 | 15805 | Bexpression* |
15806 | Interface_mtable_expression::do_get_backend(Translate_context* context) | |
2c809f8f | 15807 | { |
15808 | Gogo* gogo = context->gogo(); | |
2c809f8f | 15809 | Location loc = Linemap::predeclared_location(); |
15810 | if (this->bvar_ != NULL) | |
7af8e400 | 15811 | return gogo->backend()->var_expression(this->bvar_, this->location()); |
2c809f8f | 15812 | |
15813 | const Typed_identifier_list* interface_methods = this->itype_->methods(); | |
15814 | go_assert(!interface_methods->empty()); | |
15815 | ||
19272321 | 15816 | std::string mangled_name = |
15817 | gogo->interface_method_table_name(this->itype_, this->type_, | |
15818 | this->is_pointer_); | |
2c809f8f | 15819 | |
1530c754 | 15820 | // Set is_public if we are converting a named type to an interface |
15821 | // type that is defined in the same package as the named type, and | |
15822 | // the interface has hidden methods. In that case the interface | |
15823 | // method table will be defined by the package that defines the | |
15824 | // types. | |
15825 | bool is_public = false; | |
15826 | if (this->type_->named_type() != NULL | |
15827 | && (this->type_->named_type()->named_object()->package() | |
15828 | == this->itype_->package())) | |
15829 | { | |
15830 | for (Typed_identifier_list::const_iterator p = interface_methods->begin(); | |
15831 | p != interface_methods->end(); | |
15832 | ++p) | |
2c809f8f | 15833 | { |
1530c754 | 15834 | if (Gogo::is_hidden_name(p->name())) |
15835 | { | |
15836 | is_public = true; | |
15837 | break; | |
15838 | } | |
2c809f8f | 15839 | } |
15840 | } | |
15841 | ||
1530c754 | 15842 | if (is_public |
2c809f8f | 15843 | && this->type_->named_type()->named_object()->package() != NULL) |
15844 | { | |
1530c754 | 15845 | // The interface conversion table is defined elsewhere. |
2c809f8f | 15846 | Btype* btype = this->type()->get_backend(gogo); |
438b4bec | 15847 | std::string asm_name(go_selectively_encode_id(mangled_name)); |
2c809f8f | 15848 | this->bvar_ = |
438b4bec | 15849 | gogo->backend()->immutable_struct_reference(mangled_name, asm_name, |
15850 | btype, loc); | |
7af8e400 | 15851 | return gogo->backend()->var_expression(this->bvar_, this->location()); |
2c809f8f | 15852 | } |
15853 | ||
15854 | // The first element is the type descriptor. | |
15855 | Type* td_type; | |
15856 | if (!this->is_pointer_) | |
15857 | td_type = this->type_; | |
15858 | else | |
15859 | td_type = Type::make_pointer_type(this->type_); | |
15860 | ||
db122cb9 | 15861 | std::vector<Backend::Btyped_identifier> bstructfields; |
15862 | ||
2c809f8f | 15863 | // Build an interface method table for a type: a type descriptor followed by a |
15864 | // list of function pointers, one for each interface method. This is used for | |
15865 | // interfaces. | |
15866 | Expression_list* svals = new Expression_list(); | |
db122cb9 | 15867 | Expression* tdescriptor = Expression::make_type_descriptor(td_type, loc); |
15868 | svals->push_back(tdescriptor); | |
15869 | ||
15870 | Btype* tdesc_btype = tdescriptor->type()->get_backend(gogo); | |
15871 | Backend::Btyped_identifier btd("_type", tdesc_btype, loc); | |
15872 | bstructfields.push_back(btd); | |
2c809f8f | 15873 | |
15874 | Named_type* nt = this->type_->named_type(); | |
15875 | Struct_type* st = this->type_->struct_type(); | |
15876 | go_assert(nt != NULL || st != NULL); | |
15877 | ||
15878 | for (Typed_identifier_list::const_iterator p = interface_methods->begin(); | |
15879 | p != interface_methods->end(); | |
15880 | ++p) | |
15881 | { | |
15882 | bool is_ambiguous; | |
15883 | Method* m; | |
15884 | if (nt != NULL) | |
15885 | m = nt->method_function(p->name(), &is_ambiguous); | |
15886 | else | |
15887 | m = st->method_function(p->name(), &is_ambiguous); | |
15888 | go_assert(m != NULL); | |
15889 | Named_object* no = m->named_object(); | |
15890 | ||
15891 | go_assert(no->is_function() || no->is_function_declaration()); | |
db122cb9 | 15892 | |
15893 | Btype* fcn_btype = m->type()->get_backend_fntype(gogo); | |
15894 | Backend::Btyped_identifier bmtype(p->name(), fcn_btype, loc); | |
15895 | bstructfields.push_back(bmtype); | |
15896 | ||
2c809f8f | 15897 | svals->push_back(Expression::make_func_code_reference(no, loc)); |
15898 | } | |
15899 | ||
db122cb9 | 15900 | Btype *btype = gogo->backend()->struct_type(bstructfields); |
15901 | std::vector<Bexpression*> ctor_bexprs; | |
15902 | for (Expression_list::const_iterator pe = svals->begin(); | |
15903 | pe != svals->end(); | |
15904 | ++pe) | |
15905 | { | |
15906 | ctor_bexprs.push_back((*pe)->get_backend(context)); | |
15907 | } | |
15908 | Bexpression* ctor = | |
15909 | gogo->backend()->constructor_expression(btype, ctor_bexprs, loc); | |
2c809f8f | 15910 | |
438b4bec | 15911 | std::string asm_name(go_selectively_encode_id(mangled_name)); |
15912 | this->bvar_ = gogo->backend()->immutable_struct(mangled_name, asm_name, false, | |
2c809f8f | 15913 | !is_public, btype, loc); |
15914 | gogo->backend()->immutable_struct_set_init(this->bvar_, mangled_name, false, | |
15915 | !is_public, btype, loc, ctor); | |
7af8e400 | 15916 | return gogo->backend()->var_expression(this->bvar_, loc); |
2c809f8f | 15917 | } |
15918 | ||
15919 | void | |
15920 | Interface_mtable_expression::do_dump_expression( | |
15921 | Ast_dump_context* ast_dump_context) const | |
15922 | { | |
15923 | ast_dump_context->ostream() << "__go_" | |
15924 | << (this->is_pointer_ ? "pimt__" : "imt_"); | |
15925 | ast_dump_context->dump_type(this->itype_); | |
15926 | ast_dump_context->ostream() << "__"; | |
15927 | ast_dump_context->dump_type(this->type_); | |
15928 | } | |
15929 | ||
15930 | Expression* | |
15931 | Expression::make_interface_mtable_ref(Interface_type* itype, Type* type, | |
15932 | bool is_pointer, Location location) | |
15933 | { | |
15934 | return new Interface_mtable_expression(itype, type, is_pointer, location); | |
15935 | } | |
15936 | ||
e440a328 | 15937 | // An expression which evaluates to the offset of a field within a |
15938 | // struct. This, like Type_info_expression, q.v., is only used to | |
15939 | // initialize fields of a type descriptor. | |
15940 | ||
15941 | class Struct_field_offset_expression : public Expression | |
15942 | { | |
15943 | public: | |
15944 | Struct_field_offset_expression(Struct_type* type, const Struct_field* field) | |
b13c66cd | 15945 | : Expression(EXPRESSION_STRUCT_FIELD_OFFSET, |
15946 | Linemap::predeclared_location()), | |
e440a328 | 15947 | type_(type), field_(field) |
15948 | { } | |
15949 | ||
15950 | protected: | |
f23d7786 | 15951 | bool |
3ae06f68 | 15952 | do_is_static_initializer() const |
f23d7786 | 15953 | { return true; } |
15954 | ||
e440a328 | 15955 | Type* |
15956 | do_type() | |
15957 | { return Type::lookup_integer_type("uintptr"); } | |
15958 | ||
15959 | void | |
15960 | do_determine_type(const Type_context*) | |
15961 | { } | |
15962 | ||
15963 | Expression* | |
15964 | do_copy() | |
15965 | { return this; } | |
15966 | ||
ea664253 | 15967 | Bexpression* |
15968 | do_get_backend(Translate_context* context); | |
e440a328 | 15969 | |
d751bb78 | 15970 | void |
15971 | do_dump_expression(Ast_dump_context*) const; | |
15972 | ||
e440a328 | 15973 | private: |
15974 | // The type of the struct. | |
15975 | Struct_type* type_; | |
15976 | // The field. | |
15977 | const Struct_field* field_; | |
15978 | }; | |
15979 | ||
ea664253 | 15980 | // Return the backend representation for a struct field offset. |
e440a328 | 15981 | |
ea664253 | 15982 | Bexpression* |
15983 | Struct_field_offset_expression::do_get_backend(Translate_context* context) | |
e440a328 | 15984 | { |
e440a328 | 15985 | const Struct_field_list* fields = this->type_->fields(); |
e440a328 | 15986 | Struct_field_list::const_iterator p; |
2c8bda43 | 15987 | unsigned i = 0; |
e440a328 | 15988 | for (p = fields->begin(); |
15989 | p != fields->end(); | |
2c8bda43 | 15990 | ++p, ++i) |
15991 | if (&*p == this->field_) | |
15992 | break; | |
c484d925 | 15993 | go_assert(&*p == this->field_); |
e440a328 | 15994 | |
2c8bda43 | 15995 | Gogo* gogo = context->gogo(); |
15996 | Btype* btype = this->type_->get_backend(gogo); | |
15997 | ||
3f378015 | 15998 | int64_t offset = gogo->backend()->type_field_offset(btype, i); |
2c8bda43 | 15999 | Type* uptr_type = Type::lookup_integer_type("uintptr"); |
e67508fa | 16000 | Expression* ret = |
3f378015 | 16001 | Expression::make_integer_int64(offset, uptr_type, |
16002 | Linemap::predeclared_location()); | |
ea664253 | 16003 | return ret->get_backend(context); |
e440a328 | 16004 | } |
16005 | ||
d751bb78 | 16006 | // Dump ast representation for a struct field offset expression. |
16007 | ||
16008 | void | |
16009 | Struct_field_offset_expression::do_dump_expression( | |
16010 | Ast_dump_context* ast_dump_context) const | |
16011 | { | |
16012 | ast_dump_context->ostream() << "unsafe.Offsetof("; | |
2d29d278 | 16013 | ast_dump_context->dump_type(this->type_); |
16014 | ast_dump_context->ostream() << '.'; | |
16015 | ast_dump_context->ostream() << | |
16016 | Gogo::message_name(this->field_->field_name()); | |
d751bb78 | 16017 | ast_dump_context->ostream() << ")"; |
16018 | } | |
16019 | ||
e440a328 | 16020 | // Make an expression for a struct field offset. |
16021 | ||
16022 | Expression* | |
16023 | Expression::make_struct_field_offset(Struct_type* type, | |
16024 | const Struct_field* field) | |
16025 | { | |
16026 | return new Struct_field_offset_expression(type, field); | |
16027 | } | |
16028 | ||
16029 | // An expression which evaluates to the address of an unnamed label. | |
16030 | ||
16031 | class Label_addr_expression : public Expression | |
16032 | { | |
16033 | public: | |
b13c66cd | 16034 | Label_addr_expression(Label* label, Location location) |
e440a328 | 16035 | : Expression(EXPRESSION_LABEL_ADDR, location), |
16036 | label_(label) | |
16037 | { } | |
16038 | ||
16039 | protected: | |
16040 | Type* | |
16041 | do_type() | |
16042 | { return Type::make_pointer_type(Type::make_void_type()); } | |
16043 | ||
16044 | void | |
16045 | do_determine_type(const Type_context*) | |
16046 | { } | |
16047 | ||
16048 | Expression* | |
16049 | do_copy() | |
16050 | { return new Label_addr_expression(this->label_, this->location()); } | |
16051 | ||
ea664253 | 16052 | Bexpression* |
16053 | do_get_backend(Translate_context* context) | |
16054 | { return this->label_->get_addr(context, this->location()); } | |
e440a328 | 16055 | |
d751bb78 | 16056 | void |
16057 | do_dump_expression(Ast_dump_context* ast_dump_context) const | |
16058 | { ast_dump_context->ostream() << this->label_->name(); } | |
16059 | ||
e440a328 | 16060 | private: |
16061 | // The label whose address we are taking. | |
16062 | Label* label_; | |
16063 | }; | |
16064 | ||
16065 | // Make an expression for the address of an unnamed label. | |
16066 | ||
16067 | Expression* | |
b13c66cd | 16068 | Expression::make_label_addr(Label* label, Location location) |
e440a328 | 16069 | { |
16070 | return new Label_addr_expression(label, location); | |
16071 | } | |
16072 | ||
da244e59 | 16073 | // Class Conditional_expression. |
283a177b | 16074 | |
2c809f8f | 16075 | // Traversal. |
16076 | ||
16077 | int | |
16078 | Conditional_expression::do_traverse(Traverse* traverse) | |
16079 | { | |
16080 | if (Expression::traverse(&this->cond_, traverse) == TRAVERSE_EXIT | |
16081 | || Expression::traverse(&this->then_, traverse) == TRAVERSE_EXIT | |
16082 | || Expression::traverse(&this->else_, traverse) == TRAVERSE_EXIT) | |
16083 | return TRAVERSE_EXIT; | |
16084 | return TRAVERSE_CONTINUE; | |
16085 | } | |
16086 | ||
283a177b | 16087 | // Return the type of the conditional expression. |
16088 | ||
16089 | Type* | |
16090 | Conditional_expression::do_type() | |
16091 | { | |
16092 | Type* result_type = Type::make_void_type(); | |
3a522dcc | 16093 | if (Type::are_identical(this->then_->type(), this->else_->type(), |
16094 | Type::COMPARE_ERRORS | Type::COMPARE_TAGS, | |
2c809f8f | 16095 | NULL)) |
283a177b | 16096 | result_type = this->then_->type(); |
16097 | else if (this->then_->is_nil_expression() | |
16098 | || this->else_->is_nil_expression()) | |
16099 | result_type = (!this->then_->is_nil_expression() | |
16100 | ? this->then_->type() | |
16101 | : this->else_->type()); | |
16102 | return result_type; | |
16103 | } | |
16104 | ||
2c809f8f | 16105 | // Determine type for a conditional expression. |
16106 | ||
16107 | void | |
16108 | Conditional_expression::do_determine_type(const Type_context* context) | |
16109 | { | |
16110 | this->cond_->determine_type_no_context(); | |
16111 | this->then_->determine_type(context); | |
16112 | this->else_->determine_type(context); | |
16113 | } | |
16114 | ||
283a177b | 16115 | // Get the backend representation of a conditional expression. |
16116 | ||
ea664253 | 16117 | Bexpression* |
16118 | Conditional_expression::do_get_backend(Translate_context* context) | |
283a177b | 16119 | { |
16120 | Gogo* gogo = context->gogo(); | |
16121 | Btype* result_btype = this->type()->get_backend(gogo); | |
ea664253 | 16122 | Bexpression* cond = this->cond_->get_backend(context); |
16123 | Bexpression* then = this->then_->get_backend(context); | |
16124 | Bexpression* belse = this->else_->get_backend(context); | |
93715b75 | 16125 | Bfunction* bfn = context->function()->func_value()->get_decl(); |
16126 | return gogo->backend()->conditional_expression(bfn, result_btype, cond, then, | |
ea664253 | 16127 | belse, this->location()); |
283a177b | 16128 | } |
16129 | ||
16130 | // Dump ast representation of a conditional expression. | |
16131 | ||
16132 | void | |
16133 | Conditional_expression::do_dump_expression( | |
16134 | Ast_dump_context* ast_dump_context) const | |
16135 | { | |
16136 | ast_dump_context->ostream() << "("; | |
16137 | ast_dump_context->dump_expression(this->cond_); | |
16138 | ast_dump_context->ostream() << " ? "; | |
16139 | ast_dump_context->dump_expression(this->then_); | |
16140 | ast_dump_context->ostream() << " : "; | |
16141 | ast_dump_context->dump_expression(this->else_); | |
16142 | ast_dump_context->ostream() << ") "; | |
16143 | } | |
16144 | ||
16145 | // Make a conditional expression. | |
16146 | ||
16147 | Expression* | |
16148 | Expression::make_conditional(Expression* cond, Expression* then, | |
16149 | Expression* else_expr, Location location) | |
16150 | { | |
16151 | return new Conditional_expression(cond, then, else_expr, location); | |
16152 | } | |
16153 | ||
da244e59 | 16154 | // Class Compound_expression. |
2c809f8f | 16155 | |
16156 | // Traversal. | |
16157 | ||
16158 | int | |
16159 | Compound_expression::do_traverse(Traverse* traverse) | |
16160 | { | |
16161 | if (Expression::traverse(&this->init_, traverse) == TRAVERSE_EXIT | |
16162 | || Expression::traverse(&this->expr_, traverse) == TRAVERSE_EXIT) | |
16163 | return TRAVERSE_EXIT; | |
16164 | return TRAVERSE_CONTINUE; | |
16165 | } | |
16166 | ||
16167 | // Return the type of the compound expression. | |
16168 | ||
16169 | Type* | |
16170 | Compound_expression::do_type() | |
16171 | { | |
16172 | return this->expr_->type(); | |
16173 | } | |
16174 | ||
16175 | // Determine type for a compound expression. | |
16176 | ||
16177 | void | |
16178 | Compound_expression::do_determine_type(const Type_context* context) | |
16179 | { | |
16180 | this->init_->determine_type_no_context(); | |
16181 | this->expr_->determine_type(context); | |
16182 | } | |
16183 | ||
16184 | // Get the backend representation of a compound expression. | |
16185 | ||
ea664253 | 16186 | Bexpression* |
16187 | Compound_expression::do_get_backend(Translate_context* context) | |
2c809f8f | 16188 | { |
16189 | Gogo* gogo = context->gogo(); | |
ea664253 | 16190 | Bexpression* binit = this->init_->get_backend(context); |
0ab48656 | 16191 | Bfunction* bfunction = context->function()->func_value()->get_decl(); |
16192 | Bstatement* init_stmt = gogo->backend()->expression_statement(bfunction, | |
16193 | binit); | |
ea664253 | 16194 | Bexpression* bexpr = this->expr_->get_backend(context); |
16195 | return gogo->backend()->compound_expression(init_stmt, bexpr, | |
16196 | this->location()); | |
2c809f8f | 16197 | } |
16198 | ||
16199 | // Dump ast representation of a conditional expression. | |
16200 | ||
16201 | void | |
16202 | Compound_expression::do_dump_expression( | |
16203 | Ast_dump_context* ast_dump_context) const | |
16204 | { | |
16205 | ast_dump_context->ostream() << "("; | |
16206 | ast_dump_context->dump_expression(this->init_); | |
16207 | ast_dump_context->ostream() << ","; | |
16208 | ast_dump_context->dump_expression(this->expr_); | |
16209 | ast_dump_context->ostream() << ") "; | |
16210 | } | |
16211 | ||
16212 | // Make a compound expression. | |
16213 | ||
16214 | Expression* | |
16215 | Expression::make_compound(Expression* init, Expression* expr, Location location) | |
16216 | { | |
16217 | return new Compound_expression(init, expr, location); | |
16218 | } | |
16219 | ||
1b4fb1e0 | 16220 | // Class Backend_expression. |
16221 | ||
16222 | int | |
16223 | Backend_expression::do_traverse(Traverse*) | |
16224 | { | |
16225 | return TRAVERSE_CONTINUE; | |
16226 | } | |
16227 | ||
de590a61 | 16228 | Expression* |
16229 | Backend_expression::do_copy() | |
16230 | { | |
16231 | return new Backend_expression(this->bexpr_, this->type_->copy_expressions(), | |
16232 | this->location()); | |
16233 | } | |
16234 | ||
1b4fb1e0 | 16235 | void |
16236 | Backend_expression::do_dump_expression(Ast_dump_context* ast_dump_context) const | |
16237 | { | |
16238 | ast_dump_context->ostream() << "backend_expression<"; | |
16239 | ast_dump_context->dump_type(this->type_); | |
16240 | ast_dump_context->ostream() << ">"; | |
16241 | } | |
16242 | ||
16243 | Expression* | |
16244 | Expression::make_backend(Bexpression* bexpr, Type* type, Location location) | |
16245 | { | |
16246 | return new Backend_expression(bexpr, type, location); | |
16247 | } | |
16248 | ||
e440a328 | 16249 | // Import an expression. This comes at the end in order to see the |
16250 | // various class definitions. | |
16251 | ||
16252 | Expression* | |
bc8e2ef4 | 16253 | Expression::import_expression(Import_expression* imp, Location loc) |
e440a328 | 16254 | { |
16255 | int c = imp->peek_char(); | |
5f6f5357 | 16256 | if (c == '+' || c == '-' || c == '!' || c == '^' || c == '&' || c == '*') |
9b92780c | 16257 | return Unary_expression::do_import(imp, loc); |
e440a328 | 16258 | else if (c == '(') |
9b92780c | 16259 | return Binary_expression::do_import(imp, loc); |
204d4af4 | 16260 | else if (imp->match_c_string("$true") |
16261 | || imp->match_c_string("$false") | |
16262 | || (imp->version() < EXPORT_FORMAT_V3 | |
16263 | && (imp->match_c_string("true") | |
16264 | || imp->match_c_string("false")))) | |
9b92780c | 16265 | return Boolean_expression::do_import(imp, loc); |
e440a328 | 16266 | else if (c == '"') |
9b92780c | 16267 | return String_expression::do_import(imp, loc); |
e440a328 | 16268 | else if (c == '-' || (c >= '0' && c <= '9')) |
16269 | { | |
16270 | // This handles integers, floats and complex constants. | |
9b92780c | 16271 | return Integer_expression::do_import(imp, loc); |
e440a328 | 16272 | } |
204d4af4 | 16273 | else if (imp->match_c_string("$nil") |
16274 | || (imp->version() < EXPORT_FORMAT_V3 | |
16275 | && imp->match_c_string("nil"))) | |
9b92780c | 16276 | return Nil_expression::do_import(imp, loc); |
204d4af4 | 16277 | else if (imp->match_c_string("$convert") |
16278 | || (imp->version() < EXPORT_FORMAT_V3 | |
16279 | && imp->match_c_string("convert"))) | |
9b92780c | 16280 | return Type_conversion_expression::do_import(imp, loc); |
5f6f5357 | 16281 | |
16282 | Import_function_body* ifb = imp->ifb(); | |
16283 | if (ifb == NULL) | |
e440a328 | 16284 | { |
631d5788 | 16285 | go_error_at(imp->location(), "import error: expected expression"); |
9b92780c | 16286 | return Expression::make_error(loc); |
e440a328 | 16287 | } |
5f6f5357 | 16288 | if (ifb->saw_error()) |
16289 | return Expression::make_error(loc); | |
16290 | std::string id = ifb->read_identifier(); | |
16291 | if (id.empty()) | |
16292 | { | |
16293 | if (!ifb->saw_error()) | |
16294 | go_error_at(imp->location(), | |
16295 | "import error: expected identifier at %lu", | |
16296 | static_cast<unsigned long>(ifb->off())); | |
16297 | ifb->set_saw_error(); | |
16298 | return Expression::make_error(loc); | |
16299 | } | |
16300 | Named_object* var = ifb->block()->bindings()->lookup(id); | |
16301 | if (var == NULL) | |
16302 | { | |
16303 | if (!ifb->saw_error()) | |
16304 | go_error_at(imp->location(), "import error: lookup of %qs failed", | |
16305 | id.c_str()); | |
16306 | ifb->set_saw_error(); | |
16307 | return Expression::make_error(loc); | |
16308 | } | |
16309 | return Expression::make_var_reference(var, loc); | |
e440a328 | 16310 | } |
16311 | ||
16312 | // Class Expression_list. | |
16313 | ||
16314 | // Traverse the list. | |
16315 | ||
16316 | int | |
16317 | Expression_list::traverse(Traverse* traverse) | |
16318 | { | |
16319 | for (Expression_list::iterator p = this->begin(); | |
16320 | p != this->end(); | |
16321 | ++p) | |
16322 | { | |
16323 | if (*p != NULL) | |
16324 | { | |
16325 | if (Expression::traverse(&*p, traverse) == TRAVERSE_EXIT) | |
16326 | return TRAVERSE_EXIT; | |
16327 | } | |
16328 | } | |
16329 | return TRAVERSE_CONTINUE; | |
16330 | } | |
16331 | ||
16332 | // Copy the list. | |
16333 | ||
16334 | Expression_list* | |
16335 | Expression_list::copy() | |
16336 | { | |
16337 | Expression_list* ret = new Expression_list(); | |
16338 | for (Expression_list::iterator p = this->begin(); | |
16339 | p != this->end(); | |
16340 | ++p) | |
16341 | { | |
16342 | if (*p == NULL) | |
16343 | ret->push_back(NULL); | |
16344 | else | |
16345 | ret->push_back((*p)->copy()); | |
16346 | } | |
16347 | return ret; | |
16348 | } | |
16349 | ||
16350 | // Return whether an expression list has an error expression. | |
16351 | ||
16352 | bool | |
16353 | Expression_list::contains_error() const | |
16354 | { | |
16355 | for (Expression_list::const_iterator p = this->begin(); | |
16356 | p != this->end(); | |
16357 | ++p) | |
16358 | if (*p != NULL && (*p)->is_error_expression()) | |
16359 | return true; | |
16360 | return false; | |
16361 | } | |
0c77715b | 16362 | |
16363 | // Class Numeric_constant. | |
16364 | ||
16365 | // Destructor. | |
16366 | ||
16367 | Numeric_constant::~Numeric_constant() | |
16368 | { | |
16369 | this->clear(); | |
16370 | } | |
16371 | ||
16372 | // Copy constructor. | |
16373 | ||
16374 | Numeric_constant::Numeric_constant(const Numeric_constant& a) | |
16375 | : classification_(a.classification_), type_(a.type_) | |
16376 | { | |
16377 | switch (a.classification_) | |
16378 | { | |
16379 | case NC_INVALID: | |
16380 | break; | |
16381 | case NC_INT: | |
16382 | case NC_RUNE: | |
16383 | mpz_init_set(this->u_.int_val, a.u_.int_val); | |
16384 | break; | |
16385 | case NC_FLOAT: | |
16386 | mpfr_init_set(this->u_.float_val, a.u_.float_val, GMP_RNDN); | |
16387 | break; | |
16388 | case NC_COMPLEX: | |
fcbea5e4 | 16389 | mpc_init2(this->u_.complex_val, mpc_precision); |
16390 | mpc_set(this->u_.complex_val, a.u_.complex_val, MPC_RNDNN); | |
0c77715b | 16391 | break; |
16392 | default: | |
16393 | go_unreachable(); | |
16394 | } | |
16395 | } | |
16396 | ||
16397 | // Assignment operator. | |
16398 | ||
16399 | Numeric_constant& | |
16400 | Numeric_constant::operator=(const Numeric_constant& a) | |
16401 | { | |
16402 | this->clear(); | |
16403 | this->classification_ = a.classification_; | |
16404 | this->type_ = a.type_; | |
16405 | switch (a.classification_) | |
16406 | { | |
16407 | case NC_INVALID: | |
16408 | break; | |
16409 | case NC_INT: | |
16410 | case NC_RUNE: | |
16411 | mpz_init_set(this->u_.int_val, a.u_.int_val); | |
16412 | break; | |
16413 | case NC_FLOAT: | |
16414 | mpfr_init_set(this->u_.float_val, a.u_.float_val, GMP_RNDN); | |
16415 | break; | |
16416 | case NC_COMPLEX: | |
fcbea5e4 | 16417 | mpc_init2(this->u_.complex_val, mpc_precision); |
16418 | mpc_set(this->u_.complex_val, a.u_.complex_val, MPC_RNDNN); | |
0c77715b | 16419 | break; |
16420 | default: | |
16421 | go_unreachable(); | |
16422 | } | |
16423 | return *this; | |
16424 | } | |
16425 | ||
16426 | // Clear the contents. | |
16427 | ||
16428 | void | |
16429 | Numeric_constant::clear() | |
16430 | { | |
16431 | switch (this->classification_) | |
16432 | { | |
16433 | case NC_INVALID: | |
16434 | break; | |
16435 | case NC_INT: | |
16436 | case NC_RUNE: | |
16437 | mpz_clear(this->u_.int_val); | |
16438 | break; | |
16439 | case NC_FLOAT: | |
16440 | mpfr_clear(this->u_.float_val); | |
16441 | break; | |
16442 | case NC_COMPLEX: | |
fcbea5e4 | 16443 | mpc_clear(this->u_.complex_val); |
0c77715b | 16444 | break; |
16445 | default: | |
16446 | go_unreachable(); | |
16447 | } | |
16448 | this->classification_ = NC_INVALID; | |
16449 | } | |
16450 | ||
16451 | // Set to an unsigned long value. | |
16452 | ||
16453 | void | |
16454 | Numeric_constant::set_unsigned_long(Type* type, unsigned long val) | |
16455 | { | |
16456 | this->clear(); | |
16457 | this->classification_ = NC_INT; | |
16458 | this->type_ = type; | |
16459 | mpz_init_set_ui(this->u_.int_val, val); | |
16460 | } | |
16461 | ||
16462 | // Set to an integer value. | |
16463 | ||
16464 | void | |
16465 | Numeric_constant::set_int(Type* type, const mpz_t val) | |
16466 | { | |
16467 | this->clear(); | |
16468 | this->classification_ = NC_INT; | |
16469 | this->type_ = type; | |
16470 | mpz_init_set(this->u_.int_val, val); | |
16471 | } | |
16472 | ||
16473 | // Set to a rune value. | |
16474 | ||
16475 | void | |
16476 | Numeric_constant::set_rune(Type* type, const mpz_t val) | |
16477 | { | |
16478 | this->clear(); | |
16479 | this->classification_ = NC_RUNE; | |
16480 | this->type_ = type; | |
16481 | mpz_init_set(this->u_.int_val, val); | |
16482 | } | |
16483 | ||
16484 | // Set to a floating point value. | |
16485 | ||
16486 | void | |
16487 | Numeric_constant::set_float(Type* type, const mpfr_t val) | |
16488 | { | |
16489 | this->clear(); | |
16490 | this->classification_ = NC_FLOAT; | |
16491 | this->type_ = type; | |
d1d4ace3 | 16492 | |
833b523c | 16493 | // Numeric constants do not have negative zero values, so remove |
16494 | // them here. They also don't have infinity or NaN values, but we | |
16495 | // should never see them here. | |
d1d4ace3 | 16496 | int bits = 0; |
16497 | if (type != NULL | |
16498 | && type->float_type() != NULL | |
16499 | && !type->float_type()->is_abstract()) | |
16500 | bits = type->float_type()->bits(); | |
16501 | if (Numeric_constant::is_float_neg_zero(val, bits)) | |
833b523c | 16502 | mpfr_init_set_ui(this->u_.float_val, 0, GMP_RNDN); |
16503 | else | |
16504 | mpfr_init_set(this->u_.float_val, val, GMP_RNDN); | |
0c77715b | 16505 | } |
16506 | ||
16507 | // Set to a complex value. | |
16508 | ||
16509 | void | |
fcbea5e4 | 16510 | Numeric_constant::set_complex(Type* type, const mpc_t val) |
0c77715b | 16511 | { |
16512 | this->clear(); | |
16513 | this->classification_ = NC_COMPLEX; | |
16514 | this->type_ = type; | |
d1d4ace3 | 16515 | |
16516 | // Avoid negative zero as in set_float. | |
16517 | int bits = 0; | |
16518 | if (type != NULL | |
16519 | && type->complex_type() != NULL | |
16520 | && !type->complex_type()->is_abstract()) | |
16521 | bits = type->complex_type()->bits() / 2; | |
16522 | ||
16523 | mpfr_t real; | |
16524 | mpfr_init_set(real, mpc_realref(val), GMP_RNDN); | |
16525 | if (Numeric_constant::is_float_neg_zero(real, bits)) | |
16526 | mpfr_set_ui(real, 0, GMP_RNDN); | |
16527 | ||
16528 | mpfr_t imag; | |
16529 | mpfr_init_set(imag, mpc_imagref(val), GMP_RNDN); | |
16530 | if (Numeric_constant::is_float_neg_zero(imag, bits)) | |
16531 | mpfr_set_ui(imag, 0, GMP_RNDN); | |
16532 | ||
fcbea5e4 | 16533 | mpc_init2(this->u_.complex_val, mpc_precision); |
d1d4ace3 | 16534 | mpc_set_fr_fr(this->u_.complex_val, real, imag, MPC_RNDNN); |
16535 | ||
16536 | mpfr_clear(real); | |
16537 | mpfr_clear(imag); | |
16538 | } | |
16539 | ||
16540 | // Return whether VAL, at a precision of BITS, is a negative zero. | |
16541 | // BITS may be zero in which case it is ignored. | |
16542 | ||
16543 | bool | |
16544 | Numeric_constant::is_float_neg_zero(const mpfr_t val, int bits) | |
16545 | { | |
16546 | if (!mpfr_signbit(val)) | |
16547 | return false; | |
16548 | if (mpfr_zero_p(val)) | |
16549 | return true; | |
16550 | mp_exp_t min_exp; | |
16551 | switch (bits) | |
16552 | { | |
16553 | case 0: | |
16554 | return false; | |
16555 | case 32: | |
16556 | // In a denormalized float32 the exponent is -126, and there are | |
16557 | // 24 bits of which at least the last must be 1, so the smallest | |
16558 | // representable non-zero exponent is -126 - (24 - 1) == -149. | |
16559 | min_exp = -149; | |
16560 | break; | |
16561 | case 64: | |
16562 | // Minimum exponent is -1022, there are 53 bits. | |
16563 | min_exp = -1074; | |
16564 | break; | |
16565 | default: | |
16566 | go_unreachable(); | |
16567 | } | |
16568 | return mpfr_get_exp(val) < min_exp; | |
0c77715b | 16569 | } |
16570 | ||
16571 | // Get an int value. | |
16572 | ||
16573 | void | |
16574 | Numeric_constant::get_int(mpz_t* val) const | |
16575 | { | |
16576 | go_assert(this->is_int()); | |
16577 | mpz_init_set(*val, this->u_.int_val); | |
16578 | } | |
16579 | ||
16580 | // Get a rune value. | |
16581 | ||
16582 | void | |
16583 | Numeric_constant::get_rune(mpz_t* val) const | |
16584 | { | |
16585 | go_assert(this->is_rune()); | |
16586 | mpz_init_set(*val, this->u_.int_val); | |
16587 | } | |
16588 | ||
16589 | // Get a floating point value. | |
16590 | ||
16591 | void | |
16592 | Numeric_constant::get_float(mpfr_t* val) const | |
16593 | { | |
16594 | go_assert(this->is_float()); | |
16595 | mpfr_init_set(*val, this->u_.float_val, GMP_RNDN); | |
16596 | } | |
16597 | ||
16598 | // Get a complex value. | |
16599 | ||
16600 | void | |
fcbea5e4 | 16601 | Numeric_constant::get_complex(mpc_t* val) const |
0c77715b | 16602 | { |
16603 | go_assert(this->is_complex()); | |
fcbea5e4 | 16604 | mpc_init2(*val, mpc_precision); |
16605 | mpc_set(*val, this->u_.complex_val, MPC_RNDNN); | |
0c77715b | 16606 | } |
16607 | ||
16608 | // Express value as unsigned long if possible. | |
16609 | ||
16610 | Numeric_constant::To_unsigned_long | |
16611 | Numeric_constant::to_unsigned_long(unsigned long* val) const | |
16612 | { | |
16613 | switch (this->classification_) | |
16614 | { | |
16615 | case NC_INT: | |
16616 | case NC_RUNE: | |
16617 | return this->mpz_to_unsigned_long(this->u_.int_val, val); | |
16618 | case NC_FLOAT: | |
16619 | return this->mpfr_to_unsigned_long(this->u_.float_val, val); | |
16620 | case NC_COMPLEX: | |
fcbea5e4 | 16621 | if (!mpfr_zero_p(mpc_imagref(this->u_.complex_val))) |
0c77715b | 16622 | return NC_UL_NOTINT; |
fcbea5e4 | 16623 | return this->mpfr_to_unsigned_long(mpc_realref(this->u_.complex_val), |
16624 | val); | |
0c77715b | 16625 | default: |
16626 | go_unreachable(); | |
16627 | } | |
16628 | } | |
16629 | ||
16630 | // Express integer value as unsigned long if possible. | |
16631 | ||
16632 | Numeric_constant::To_unsigned_long | |
16633 | Numeric_constant::mpz_to_unsigned_long(const mpz_t ival, | |
16634 | unsigned long *val) const | |
16635 | { | |
16636 | if (mpz_sgn(ival) < 0) | |
16637 | return NC_UL_NEGATIVE; | |
16638 | unsigned long ui = mpz_get_ui(ival); | |
16639 | if (mpz_cmp_ui(ival, ui) != 0) | |
16640 | return NC_UL_BIG; | |
16641 | *val = ui; | |
16642 | return NC_UL_VALID; | |
16643 | } | |
16644 | ||
16645 | // Express floating point value as unsigned long if possible. | |
16646 | ||
16647 | Numeric_constant::To_unsigned_long | |
16648 | Numeric_constant::mpfr_to_unsigned_long(const mpfr_t fval, | |
16649 | unsigned long *val) const | |
16650 | { | |
16651 | if (!mpfr_integer_p(fval)) | |
16652 | return NC_UL_NOTINT; | |
16653 | mpz_t ival; | |
16654 | mpz_init(ival); | |
16655 | mpfr_get_z(ival, fval, GMP_RNDN); | |
16656 | To_unsigned_long ret = this->mpz_to_unsigned_long(ival, val); | |
16657 | mpz_clear(ival); | |
16658 | return ret; | |
16659 | } | |
16660 | ||
03118c21 | 16661 | // Express value as memory size if possible. |
16662 | ||
16663 | bool | |
16664 | Numeric_constant::to_memory_size(int64_t* val) const | |
16665 | { | |
16666 | switch (this->classification_) | |
16667 | { | |
16668 | case NC_INT: | |
16669 | case NC_RUNE: | |
16670 | return this->mpz_to_memory_size(this->u_.int_val, val); | |
16671 | case NC_FLOAT: | |
16672 | return this->mpfr_to_memory_size(this->u_.float_val, val); | |
16673 | case NC_COMPLEX: | |
16674 | if (!mpfr_zero_p(mpc_imagref(this->u_.complex_val))) | |
16675 | return false; | |
16676 | return this->mpfr_to_memory_size(mpc_realref(this->u_.complex_val), val); | |
16677 | default: | |
16678 | go_unreachable(); | |
16679 | } | |
16680 | } | |
16681 | ||
16682 | // Express integer as memory size if possible. | |
16683 | ||
16684 | bool | |
16685 | Numeric_constant::mpz_to_memory_size(const mpz_t ival, int64_t* val) const | |
16686 | { | |
16687 | if (mpz_sgn(ival) < 0) | |
16688 | return false; | |
16689 | if (mpz_fits_slong_p(ival)) | |
16690 | { | |
16691 | *val = static_cast<int64_t>(mpz_get_si(ival)); | |
16692 | return true; | |
16693 | } | |
16694 | ||
16695 | // Test >= 64, not > 64, because an int64_t can hold 63 bits of a | |
16696 | // positive value. | |
16697 | if (mpz_sizeinbase(ival, 2) >= 64) | |
16698 | return false; | |
16699 | ||
16700 | mpz_t q, r; | |
16701 | mpz_init(q); | |
16702 | mpz_init(r); | |
16703 | mpz_tdiv_q_2exp(q, ival, 32); | |
16704 | mpz_tdiv_r_2exp(r, ival, 32); | |
16705 | go_assert(mpz_fits_ulong_p(q) && mpz_fits_ulong_p(r)); | |
16706 | *val = ((static_cast<int64_t>(mpz_get_ui(q)) << 32) | |
16707 | + static_cast<int64_t>(mpz_get_ui(r))); | |
16708 | mpz_clear(r); | |
16709 | mpz_clear(q); | |
16710 | return true; | |
16711 | } | |
16712 | ||
16713 | // Express floating point value as memory size if possible. | |
16714 | ||
16715 | bool | |
16716 | Numeric_constant::mpfr_to_memory_size(const mpfr_t fval, int64_t* val) const | |
16717 | { | |
16718 | if (!mpfr_integer_p(fval)) | |
16719 | return false; | |
16720 | mpz_t ival; | |
16721 | mpz_init(ival); | |
16722 | mpfr_get_z(ival, fval, GMP_RNDN); | |
16723 | bool ret = this->mpz_to_memory_size(ival, val); | |
16724 | mpz_clear(ival); | |
16725 | return ret; | |
16726 | } | |
16727 | ||
0c77715b | 16728 | // Convert value to integer if possible. |
16729 | ||
16730 | bool | |
16731 | Numeric_constant::to_int(mpz_t* val) const | |
16732 | { | |
16733 | switch (this->classification_) | |
16734 | { | |
16735 | case NC_INT: | |
16736 | case NC_RUNE: | |
16737 | mpz_init_set(*val, this->u_.int_val); | |
16738 | return true; | |
16739 | case NC_FLOAT: | |
16740 | if (!mpfr_integer_p(this->u_.float_val)) | |
16741 | return false; | |
16742 | mpz_init(*val); | |
16743 | mpfr_get_z(*val, this->u_.float_val, GMP_RNDN); | |
16744 | return true; | |
16745 | case NC_COMPLEX: | |
fcbea5e4 | 16746 | if (!mpfr_zero_p(mpc_imagref(this->u_.complex_val)) |
16747 | || !mpfr_integer_p(mpc_realref(this->u_.complex_val))) | |
0c77715b | 16748 | return false; |
16749 | mpz_init(*val); | |
fcbea5e4 | 16750 | mpfr_get_z(*val, mpc_realref(this->u_.complex_val), GMP_RNDN); |
0c77715b | 16751 | return true; |
16752 | default: | |
16753 | go_unreachable(); | |
16754 | } | |
16755 | } | |
16756 | ||
16757 | // Convert value to floating point if possible. | |
16758 | ||
16759 | bool | |
16760 | Numeric_constant::to_float(mpfr_t* val) const | |
16761 | { | |
16762 | switch (this->classification_) | |
16763 | { | |
16764 | case NC_INT: | |
16765 | case NC_RUNE: | |
16766 | mpfr_init_set_z(*val, this->u_.int_val, GMP_RNDN); | |
16767 | return true; | |
16768 | case NC_FLOAT: | |
16769 | mpfr_init_set(*val, this->u_.float_val, GMP_RNDN); | |
16770 | return true; | |
16771 | case NC_COMPLEX: | |
fcbea5e4 | 16772 | if (!mpfr_zero_p(mpc_imagref(this->u_.complex_val))) |
0c77715b | 16773 | return false; |
fcbea5e4 | 16774 | mpfr_init_set(*val, mpc_realref(this->u_.complex_val), GMP_RNDN); |
0c77715b | 16775 | return true; |
16776 | default: | |
16777 | go_unreachable(); | |
16778 | } | |
16779 | } | |
16780 | ||
16781 | // Convert value to complex. | |
16782 | ||
16783 | bool | |
fcbea5e4 | 16784 | Numeric_constant::to_complex(mpc_t* val) const |
0c77715b | 16785 | { |
fcbea5e4 | 16786 | mpc_init2(*val, mpc_precision); |
0c77715b | 16787 | switch (this->classification_) |
16788 | { | |
16789 | case NC_INT: | |
16790 | case NC_RUNE: | |
fcbea5e4 | 16791 | mpc_set_z(*val, this->u_.int_val, MPC_RNDNN); |
0c77715b | 16792 | return true; |
16793 | case NC_FLOAT: | |
fcbea5e4 | 16794 | mpc_set_fr(*val, this->u_.float_val, MPC_RNDNN); |
0c77715b | 16795 | return true; |
16796 | case NC_COMPLEX: | |
fcbea5e4 | 16797 | mpc_set(*val, this->u_.complex_val, MPC_RNDNN); |
0c77715b | 16798 | return true; |
16799 | default: | |
16800 | go_unreachable(); | |
16801 | } | |
16802 | } | |
16803 | ||
16804 | // Get the type. | |
16805 | ||
16806 | Type* | |
16807 | Numeric_constant::type() const | |
16808 | { | |
16809 | if (this->type_ != NULL) | |
16810 | return this->type_; | |
16811 | switch (this->classification_) | |
16812 | { | |
16813 | case NC_INT: | |
16814 | return Type::make_abstract_integer_type(); | |
16815 | case NC_RUNE: | |
16816 | return Type::make_abstract_character_type(); | |
16817 | case NC_FLOAT: | |
16818 | return Type::make_abstract_float_type(); | |
16819 | case NC_COMPLEX: | |
16820 | return Type::make_abstract_complex_type(); | |
16821 | default: | |
16822 | go_unreachable(); | |
16823 | } | |
16824 | } | |
16825 | ||
16826 | // If the constant can be expressed in TYPE, then set the type of the | |
16827 | // constant to TYPE and return true. Otherwise return false, and, if | |
16828 | // ISSUE_ERROR is true, report an appropriate error message. | |
16829 | ||
16830 | bool | |
16831 | Numeric_constant::set_type(Type* type, bool issue_error, Location loc) | |
16832 | { | |
16833 | bool ret; | |
f11c2155 | 16834 | if (type == NULL || type->is_error()) |
0c77715b | 16835 | ret = true; |
16836 | else if (type->integer_type() != NULL) | |
16837 | ret = this->check_int_type(type->integer_type(), issue_error, loc); | |
16838 | else if (type->float_type() != NULL) | |
16839 | ret = this->check_float_type(type->float_type(), issue_error, loc); | |
16840 | else if (type->complex_type() != NULL) | |
16841 | ret = this->check_complex_type(type->complex_type(), issue_error, loc); | |
16842 | else | |
5706ab68 | 16843 | { |
16844 | ret = false; | |
16845 | if (issue_error) | |
16846 | go_assert(saw_errors()); | |
16847 | } | |
0c77715b | 16848 | if (ret) |
16849 | this->type_ = type; | |
16850 | return ret; | |
16851 | } | |
16852 | ||
16853 | // Check whether the constant can be expressed in an integer type. | |
16854 | ||
16855 | bool | |
16856 | Numeric_constant::check_int_type(Integer_type* type, bool issue_error, | |
71a45216 | 16857 | Location location) |
0c77715b | 16858 | { |
16859 | mpz_t val; | |
16860 | switch (this->classification_) | |
16861 | { | |
16862 | case NC_INT: | |
16863 | case NC_RUNE: | |
16864 | mpz_init_set(val, this->u_.int_val); | |
16865 | break; | |
16866 | ||
16867 | case NC_FLOAT: | |
16868 | if (!mpfr_integer_p(this->u_.float_val)) | |
16869 | { | |
16870 | if (issue_error) | |
71a45216 | 16871 | { |
631d5788 | 16872 | go_error_at(location, |
16873 | "floating point constant truncated to integer"); | |
71a45216 | 16874 | this->set_invalid(); |
16875 | } | |
0c77715b | 16876 | return false; |
16877 | } | |
16878 | mpz_init(val); | |
16879 | mpfr_get_z(val, this->u_.float_val, GMP_RNDN); | |
16880 | break; | |
16881 | ||
16882 | case NC_COMPLEX: | |
fcbea5e4 | 16883 | if (!mpfr_integer_p(mpc_realref(this->u_.complex_val)) |
16884 | || !mpfr_zero_p(mpc_imagref(this->u_.complex_val))) | |
0c77715b | 16885 | { |
16886 | if (issue_error) | |
71a45216 | 16887 | { |
631d5788 | 16888 | go_error_at(location, "complex constant truncated to integer"); |
71a45216 | 16889 | this->set_invalid(); |
16890 | } | |
0c77715b | 16891 | return false; |
16892 | } | |
16893 | mpz_init(val); | |
fcbea5e4 | 16894 | mpfr_get_z(val, mpc_realref(this->u_.complex_val), GMP_RNDN); |
0c77715b | 16895 | break; |
16896 | ||
16897 | default: | |
16898 | go_unreachable(); | |
16899 | } | |
16900 | ||
16901 | bool ret; | |
16902 | if (type->is_abstract()) | |
16903 | ret = true; | |
16904 | else | |
16905 | { | |
16906 | int bits = mpz_sizeinbase(val, 2); | |
16907 | if (type->is_unsigned()) | |
16908 | { | |
16909 | // For an unsigned type we can only accept a nonnegative | |
16910 | // number, and we must be able to represents at least BITS. | |
16911 | ret = mpz_sgn(val) >= 0 && bits <= type->bits(); | |
16912 | } | |
16913 | else | |
16914 | { | |
16915 | // For a signed type we need an extra bit to indicate the | |
16916 | // sign. We have to handle the most negative integer | |
16917 | // specially. | |
16918 | ret = (bits + 1 <= type->bits() | |
16919 | || (bits <= type->bits() | |
16920 | && mpz_sgn(val) < 0 | |
16921 | && (mpz_scan1(val, 0) | |
16922 | == static_cast<unsigned long>(type->bits() - 1)) | |
16923 | && mpz_scan0(val, type->bits()) == ULONG_MAX)); | |
16924 | } | |
16925 | } | |
16926 | ||
16927 | if (!ret && issue_error) | |
71a45216 | 16928 | { |
631d5788 | 16929 | go_error_at(location, "integer constant overflow"); |
71a45216 | 16930 | this->set_invalid(); |
16931 | } | |
0c77715b | 16932 | |
16933 | return ret; | |
16934 | } | |
16935 | ||
16936 | // Check whether the constant can be expressed in a floating point | |
16937 | // type. | |
16938 | ||
16939 | bool | |
16940 | Numeric_constant::check_float_type(Float_type* type, bool issue_error, | |
d0bcce51 | 16941 | Location location) |
0c77715b | 16942 | { |
16943 | mpfr_t val; | |
16944 | switch (this->classification_) | |
16945 | { | |
16946 | case NC_INT: | |
16947 | case NC_RUNE: | |
16948 | mpfr_init_set_z(val, this->u_.int_val, GMP_RNDN); | |
16949 | break; | |
16950 | ||
16951 | case NC_FLOAT: | |
16952 | mpfr_init_set(val, this->u_.float_val, GMP_RNDN); | |
16953 | break; | |
16954 | ||
16955 | case NC_COMPLEX: | |
fcbea5e4 | 16956 | if (!mpfr_zero_p(mpc_imagref(this->u_.complex_val))) |
0c77715b | 16957 | { |
16958 | if (issue_error) | |
71a45216 | 16959 | { |
16960 | this->set_invalid(); | |
631d5788 | 16961 | go_error_at(location, "complex constant truncated to float"); |
71a45216 | 16962 | } |
0c77715b | 16963 | return false; |
16964 | } | |
fcbea5e4 | 16965 | mpfr_init_set(val, mpc_realref(this->u_.complex_val), GMP_RNDN); |
0c77715b | 16966 | break; |
16967 | ||
16968 | default: | |
16969 | go_unreachable(); | |
16970 | } | |
16971 | ||
16972 | bool ret; | |
16973 | if (type->is_abstract()) | |
16974 | ret = true; | |
16975 | else if (mpfr_nan_p(val) || mpfr_inf_p(val) || mpfr_zero_p(val)) | |
16976 | { | |
16977 | // A NaN or Infinity always fits in the range of the type. | |
16978 | ret = true; | |
16979 | } | |
16980 | else | |
16981 | { | |
16982 | mp_exp_t exp = mpfr_get_exp(val); | |
16983 | mp_exp_t max_exp; | |
16984 | switch (type->bits()) | |
16985 | { | |
16986 | case 32: | |
16987 | max_exp = 128; | |
16988 | break; | |
16989 | case 64: | |
16990 | max_exp = 1024; | |
16991 | break; | |
16992 | default: | |
16993 | go_unreachable(); | |
16994 | } | |
16995 | ||
16996 | ret = exp <= max_exp; | |
d0bcce51 | 16997 | |
16998 | if (ret) | |
16999 | { | |
17000 | // Round the constant to the desired type. | |
17001 | mpfr_t t; | |
17002 | mpfr_init(t); | |
17003 | switch (type->bits()) | |
17004 | { | |
17005 | case 32: | |
17006 | mpfr_set_prec(t, 24); | |
17007 | break; | |
17008 | case 64: | |
17009 | mpfr_set_prec(t, 53); | |
17010 | break; | |
17011 | default: | |
17012 | go_unreachable(); | |
17013 | } | |
17014 | mpfr_set(t, val, GMP_RNDN); | |
17015 | mpfr_set(val, t, GMP_RNDN); | |
17016 | mpfr_clear(t); | |
17017 | ||
17018 | this->set_float(type, val); | |
17019 | } | |
0c77715b | 17020 | } |
17021 | ||
17022 | mpfr_clear(val); | |
17023 | ||
17024 | if (!ret && issue_error) | |
71a45216 | 17025 | { |
631d5788 | 17026 | go_error_at(location, "floating point constant overflow"); |
71a45216 | 17027 | this->set_invalid(); |
17028 | } | |
0c77715b | 17029 | |
17030 | return ret; | |
17031 | } | |
17032 | ||
17033 | // Check whether the constant can be expressed in a complex type. | |
17034 | ||
17035 | bool | |
17036 | Numeric_constant::check_complex_type(Complex_type* type, bool issue_error, | |
d0bcce51 | 17037 | Location location) |
0c77715b | 17038 | { |
17039 | if (type->is_abstract()) | |
17040 | return true; | |
17041 | ||
17042 | mp_exp_t max_exp; | |
17043 | switch (type->bits()) | |
17044 | { | |
17045 | case 64: | |
17046 | max_exp = 128; | |
17047 | break; | |
17048 | case 128: | |
17049 | max_exp = 1024; | |
17050 | break; | |
17051 | default: | |
17052 | go_unreachable(); | |
17053 | } | |
17054 | ||
fcbea5e4 | 17055 | mpc_t val; |
17056 | mpc_init2(val, mpc_precision); | |
0c77715b | 17057 | switch (this->classification_) |
17058 | { | |
17059 | case NC_INT: | |
17060 | case NC_RUNE: | |
fcbea5e4 | 17061 | mpc_set_z(val, this->u_.int_val, MPC_RNDNN); |
0c77715b | 17062 | break; |
17063 | ||
17064 | case NC_FLOAT: | |
fcbea5e4 | 17065 | mpc_set_fr(val, this->u_.float_val, MPC_RNDNN); |
0c77715b | 17066 | break; |
17067 | ||
17068 | case NC_COMPLEX: | |
fcbea5e4 | 17069 | mpc_set(val, this->u_.complex_val, MPC_RNDNN); |
0c77715b | 17070 | break; |
17071 | ||
17072 | default: | |
17073 | go_unreachable(); | |
17074 | } | |
17075 | ||
d0bcce51 | 17076 | bool ret = true; |
fcbea5e4 | 17077 | if (!mpfr_nan_p(mpc_realref(val)) |
17078 | && !mpfr_inf_p(mpc_realref(val)) | |
17079 | && !mpfr_zero_p(mpc_realref(val)) | |
17080 | && mpfr_get_exp(mpc_realref(val)) > max_exp) | |
d0bcce51 | 17081 | { |
17082 | if (issue_error) | |
71a45216 | 17083 | { |
631d5788 | 17084 | go_error_at(location, "complex real part overflow"); |
71a45216 | 17085 | this->set_invalid(); |
17086 | } | |
d0bcce51 | 17087 | ret = false; |
17088 | } | |
0c77715b | 17089 | |
fcbea5e4 | 17090 | if (!mpfr_nan_p(mpc_imagref(val)) |
17091 | && !mpfr_inf_p(mpc_imagref(val)) | |
17092 | && !mpfr_zero_p(mpc_imagref(val)) | |
17093 | && mpfr_get_exp(mpc_imagref(val)) > max_exp) | |
d0bcce51 | 17094 | { |
17095 | if (issue_error) | |
71a45216 | 17096 | { |
631d5788 | 17097 | go_error_at(location, "complex imaginary part overflow"); |
71a45216 | 17098 | this->set_invalid(); |
17099 | } | |
d0bcce51 | 17100 | ret = false; |
17101 | } | |
0c77715b | 17102 | |
d0bcce51 | 17103 | if (ret) |
17104 | { | |
17105 | // Round the constant to the desired type. | |
fcbea5e4 | 17106 | mpc_t t; |
d0bcce51 | 17107 | switch (type->bits()) |
17108 | { | |
17109 | case 64: | |
fcbea5e4 | 17110 | mpc_init2(t, 24); |
d0bcce51 | 17111 | break; |
17112 | case 128: | |
fcbea5e4 | 17113 | mpc_init2(t, 53); |
d0bcce51 | 17114 | break; |
17115 | default: | |
17116 | go_unreachable(); | |
17117 | } | |
fcbea5e4 | 17118 | mpc_set(t, val, MPC_RNDNN); |
17119 | mpc_set(val, t, MPC_RNDNN); | |
17120 | mpc_clear(t); | |
d0bcce51 | 17121 | |
fcbea5e4 | 17122 | this->set_complex(type, val); |
d0bcce51 | 17123 | } |
17124 | ||
fcbea5e4 | 17125 | mpc_clear(val); |
0c77715b | 17126 | |
17127 | return ret; | |
17128 | } | |
17129 | ||
17130 | // Return an Expression for this value. | |
17131 | ||
17132 | Expression* | |
17133 | Numeric_constant::expression(Location loc) const | |
17134 | { | |
17135 | switch (this->classification_) | |
17136 | { | |
17137 | case NC_INT: | |
e67508fa | 17138 | return Expression::make_integer_z(&this->u_.int_val, this->type_, loc); |
0c77715b | 17139 | case NC_RUNE: |
17140 | return Expression::make_character(&this->u_.int_val, this->type_, loc); | |
17141 | case NC_FLOAT: | |
17142 | return Expression::make_float(&this->u_.float_val, this->type_, loc); | |
17143 | case NC_COMPLEX: | |
fcbea5e4 | 17144 | return Expression::make_complex(&this->u_.complex_val, this->type_, loc); |
71a45216 | 17145 | case NC_INVALID: |
17146 | go_assert(saw_errors()); | |
17147 | return Expression::make_error(loc); | |
0c77715b | 17148 | default: |
17149 | go_unreachable(); | |
17150 | } | |
17151 | } |