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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 | |
85 | Expression::do_export(Export*) const | |
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 | ||
2c809f8f | 134 | // Return an expression handling any conversions which must be done during |
e440a328 | 135 | // assignment. |
136 | ||
2c809f8f | 137 | Expression* |
b4a33049 | 138 | Expression::convert_for_assignment(Gogo*, Type* lhs_type, |
2c809f8f | 139 | Expression* rhs, Location location) |
e440a328 | 140 | { |
2c809f8f | 141 | Type* rhs_type = rhs->type(); |
142 | if (lhs_type->is_error() | |
143 | || rhs_type->is_error() | |
144 | || rhs->is_error_expression()) | |
145 | return Expression::make_error(location); | |
e440a328 | 146 | |
54211955 | 147 | if (lhs_type->forwarded() != rhs_type->forwarded() |
148 | && lhs_type->interface_type() != NULL) | |
e440a328 | 149 | { |
150 | if (rhs_type->interface_type() == NULL) | |
2c809f8f | 151 | return Expression::convert_type_to_interface(lhs_type, rhs, location); |
e440a328 | 152 | else |
2c809f8f | 153 | return Expression::convert_interface_to_interface(lhs_type, rhs, false, |
154 | location); | |
e440a328 | 155 | } |
54211955 | 156 | else if (lhs_type->forwarded() != rhs_type->forwarded() |
157 | && rhs_type->interface_type() != NULL) | |
2c809f8f | 158 | return Expression::convert_interface_to_type(lhs_type, rhs, location); |
411eb89e | 159 | else if (lhs_type->is_slice_type() && rhs_type->is_nil_type()) |
e440a328 | 160 | { |
2c809f8f | 161 | // Assigning nil to a slice. |
2c809f8f | 162 | Expression* nil = Expression::make_nil(location); |
e67508fa | 163 | Expression* zero = Expression::make_integer_ul(0, NULL, location); |
2c809f8f | 164 | return Expression::make_slice_value(lhs_type, nil, zero, zero, location); |
e440a328 | 165 | } |
166 | else if (rhs_type->is_nil_type()) | |
2c809f8f | 167 | return Expression::make_nil(location); |
168 | else if (Type::are_identical(lhs_type, rhs_type, false, NULL)) | |
e440a328 | 169 | { |
170 | // No conversion is needed. | |
2c809f8f | 171 | return rhs; |
172 | } | |
173 | else if (lhs_type->points_to() != NULL) | |
174 | return Expression::make_unsafe_cast(lhs_type, rhs, location); | |
175 | else if (lhs_type->is_numeric_type()) | |
176 | return Expression::make_cast(lhs_type, rhs, location); | |
177 | else if ((lhs_type->struct_type() != NULL | |
178 | && rhs_type->struct_type() != NULL) | |
179 | || (lhs_type->array_type() != NULL | |
180 | && rhs_type->array_type() != NULL)) | |
e440a328 | 181 | { |
182 | // This conversion must be permitted by Go, or we wouldn't have | |
183 | // gotten here. | |
2c809f8f | 184 | return Expression::make_unsafe_cast(lhs_type, rhs, location); |
e440a328 | 185 | } |
186 | else | |
2c809f8f | 187 | return rhs; |
e440a328 | 188 | } |
189 | ||
2c809f8f | 190 | // Return an expression for a conversion from a non-interface type to an |
e440a328 | 191 | // interface type. |
192 | ||
2c809f8f | 193 | Expression* |
194 | Expression::convert_type_to_interface(Type* lhs_type, Expression* rhs, | |
195 | Location location) | |
e440a328 | 196 | { |
e440a328 | 197 | Interface_type* lhs_interface_type = lhs_type->interface_type(); |
198 | bool lhs_is_empty = lhs_interface_type->is_empty(); | |
199 | ||
200 | // Since RHS_TYPE is a static type, we can create the interface | |
201 | // method table at compile time. | |
202 | ||
203 | // When setting an interface to nil, we just set both fields to | |
204 | // NULL. | |
2c809f8f | 205 | Type* rhs_type = rhs->type(); |
e440a328 | 206 | if (rhs_type->is_nil_type()) |
63697958 | 207 | { |
2c809f8f | 208 | Expression* nil = Expression::make_nil(location); |
209 | return Expression::make_interface_value(lhs_type, nil, nil, location); | |
63697958 | 210 | } |
e440a328 | 211 | |
212 | // This should have been checked already. | |
c484d925 | 213 | go_assert(lhs_interface_type->implements_interface(rhs_type, NULL)); |
e440a328 | 214 | |
e440a328 | 215 | // An interface is a tuple. If LHS_TYPE is an empty interface type, |
216 | // then the first field is the type descriptor for RHS_TYPE. | |
217 | // Otherwise it is the interface method table for RHS_TYPE. | |
2c809f8f | 218 | Expression* first_field; |
e440a328 | 219 | if (lhs_is_empty) |
2c809f8f | 220 | first_field = Expression::make_type_descriptor(rhs_type, location); |
e440a328 | 221 | else |
222 | { | |
223 | // Build the interface method table for this interface and this | |
224 | // object type: a list of function pointers for each interface | |
225 | // method. | |
226 | Named_type* rhs_named_type = rhs_type->named_type(); | |
c0cab2ec | 227 | Struct_type* rhs_struct_type = rhs_type->struct_type(); |
e440a328 | 228 | bool is_pointer = false; |
c0cab2ec | 229 | if (rhs_named_type == NULL && rhs_struct_type == NULL) |
e440a328 | 230 | { |
231 | rhs_named_type = rhs_type->deref()->named_type(); | |
c0cab2ec | 232 | rhs_struct_type = rhs_type->deref()->struct_type(); |
e440a328 | 233 | is_pointer = true; |
234 | } | |
c0cab2ec | 235 | if (rhs_named_type != NULL) |
2c809f8f | 236 | first_field = |
237 | rhs_named_type->interface_method_table(lhs_interface_type, | |
238 | is_pointer); | |
c0cab2ec | 239 | else if (rhs_struct_type != NULL) |
2c809f8f | 240 | first_field = |
241 | rhs_struct_type->interface_method_table(lhs_interface_type, | |
242 | is_pointer); | |
c0cab2ec | 243 | else |
2c809f8f | 244 | first_field = Expression::make_nil(location); |
e440a328 | 245 | } |
e440a328 | 246 | |
2c809f8f | 247 | Expression* obj; |
e440a328 | 248 | if (rhs_type->points_to() != NULL) |
249 | { | |
2c809f8f | 250 | // We are assigning a pointer to the interface; the interface |
e440a328 | 251 | // holds the pointer itself. |
2c809f8f | 252 | obj = rhs; |
253 | } | |
254 | else | |
255 | { | |
256 | // We are assigning a non-pointer value to the interface; the | |
45ff893b | 257 | // interface gets a copy of the value in the heap if it escapes. |
258 | // TODO(cmang): Associate escape state state of RHS with newly | |
259 | // created OBJ. | |
2c809f8f | 260 | obj = Expression::make_heap_expression(rhs, location); |
e440a328 | 261 | } |
262 | ||
2c809f8f | 263 | return Expression::make_interface_value(lhs_type, first_field, obj, location); |
264 | } | |
e440a328 | 265 | |
2c809f8f | 266 | // Return an expression for the type descriptor of RHS. |
e440a328 | 267 | |
2c809f8f | 268 | Expression* |
269 | Expression::get_interface_type_descriptor(Expression* rhs) | |
270 | { | |
271 | go_assert(rhs->type()->interface_type() != NULL); | |
272 | Location location = rhs->location(); | |
e440a328 | 273 | |
2c809f8f | 274 | // The type descriptor is the first field of an empty interface. |
275 | if (rhs->type()->interface_type()->is_empty()) | |
276 | return Expression::make_interface_info(rhs, INTERFACE_INFO_TYPE_DESCRIPTOR, | |
277 | location); | |
278 | ||
279 | Expression* mtable = | |
280 | Expression::make_interface_info(rhs, INTERFACE_INFO_METHODS, location); | |
e440a328 | 281 | |
2c809f8f | 282 | Expression* descriptor = |
283 | Expression::make_unary(OPERATOR_MULT, mtable, location); | |
284 | descriptor = Expression::make_field_reference(descriptor, 0, location); | |
285 | Expression* nil = Expression::make_nil(location); | |
e440a328 | 286 | |
2c809f8f | 287 | Expression* eq = |
288 | Expression::make_binary(OPERATOR_EQEQ, mtable, nil, location); | |
289 | return Expression::make_conditional(eq, nil, descriptor, location); | |
e440a328 | 290 | } |
291 | ||
2c809f8f | 292 | // Return an expression for the conversion of an interface type to an |
e440a328 | 293 | // interface type. |
294 | ||
2c809f8f | 295 | Expression* |
296 | Expression::convert_interface_to_interface(Type *lhs_type, Expression* rhs, | |
297 | bool for_type_guard, | |
298 | Location location) | |
e440a328 | 299 | { |
8ba8cc87 | 300 | if (Type::are_identical(lhs_type, rhs->type(), false, NULL)) |
301 | return rhs; | |
302 | ||
e440a328 | 303 | Interface_type* lhs_interface_type = lhs_type->interface_type(); |
304 | bool lhs_is_empty = lhs_interface_type->is_empty(); | |
305 | ||
e440a328 | 306 | // In the general case this requires runtime examination of the type |
307 | // method table to match it up with the interface methods. | |
308 | ||
309 | // FIXME: If all of the methods in the right hand side interface | |
310 | // also appear in the left hand side interface, then we don't need | |
311 | // to do a runtime check, although we still need to build a new | |
312 | // method table. | |
313 | ||
8ba8cc87 | 314 | // We are going to evaluate RHS multiple times. |
315 | go_assert(rhs->is_variable()); | |
316 | ||
e440a328 | 317 | // Get the type descriptor for the right hand side. This will be |
318 | // NULL for a nil interface. | |
2c809f8f | 319 | Expression* rhs_type_expr = Expression::get_interface_type_descriptor(rhs); |
320 | Expression* lhs_type_expr = | |
321 | Expression::make_type_descriptor(lhs_type, location); | |
e440a328 | 322 | |
2c809f8f | 323 | Expression* first_field; |
e440a328 | 324 | if (for_type_guard) |
325 | { | |
326 | // A type assertion fails when converting a nil interface. | |
6098d6cb | 327 | first_field = Runtime::make_call(Runtime::ASSERTITAB, location, 2, |
328 | lhs_type_expr, rhs_type_expr); | |
e440a328 | 329 | } |
330 | else if (lhs_is_empty) | |
331 | { | |
2c809f8f | 332 | // A conversion to an empty interface always succeeds, and the |
e440a328 | 333 | // first field is just the type descriptor of the object. |
2c809f8f | 334 | first_field = rhs_type_expr; |
e440a328 | 335 | } |
336 | else | |
337 | { | |
338 | // A conversion to a non-empty interface may fail, but unlike a | |
339 | // type assertion converting nil will always succeed. | |
6098d6cb | 340 | first_field = Runtime::make_call(Runtime::REQUIREITAB, location, 2, |
341 | lhs_type_expr, rhs_type_expr); | |
e440a328 | 342 | } |
343 | ||
344 | // The second field is simply the object pointer. | |
2c809f8f | 345 | Expression* obj = |
346 | Expression::make_interface_info(rhs, INTERFACE_INFO_OBJECT, location); | |
347 | return Expression::make_interface_value(lhs_type, first_field, obj, location); | |
e440a328 | 348 | } |
349 | ||
2c809f8f | 350 | // Return an expression for the conversion of an interface type to a |
e440a328 | 351 | // non-interface type. |
352 | ||
2c809f8f | 353 | Expression* |
354 | Expression::convert_interface_to_type(Type *lhs_type, Expression* rhs, | |
355 | Location location) | |
e440a328 | 356 | { |
8ba8cc87 | 357 | // We are going to evaluate RHS multiple times. |
358 | go_assert(rhs->is_variable()); | |
359 | ||
e440a328 | 360 | // Call a function to check that the type is valid. The function |
361 | // will panic with an appropriate runtime type error if the type is | |
362 | // not valid. | |
2c809f8f | 363 | Expression* lhs_type_expr = Expression::make_type_descriptor(lhs_type, |
364 | location); | |
365 | Expression* rhs_descriptor = | |
366 | Expression::get_interface_type_descriptor(rhs); | |
367 | ||
368 | Type* rhs_type = rhs->type(); | |
369 | Expression* rhs_inter_expr = Expression::make_type_descriptor(rhs_type, | |
370 | location); | |
371 | ||
6098d6cb | 372 | Expression* check_iface = Runtime::make_call(Runtime::ASSERTI2T, |
2c809f8f | 373 | location, 3, lhs_type_expr, |
374 | rhs_descriptor, rhs_inter_expr); | |
e440a328 | 375 | |
376 | // If the call succeeds, pull out the value. | |
2c809f8f | 377 | Expression* obj = Expression::make_interface_info(rhs, INTERFACE_INFO_OBJECT, |
378 | location); | |
e440a328 | 379 | |
380 | // If the value is a pointer, then it is the value we want. | |
381 | // Otherwise it points to the value. | |
382 | if (lhs_type->points_to() == NULL) | |
383 | { | |
2c809f8f | 384 | obj = Expression::make_unsafe_cast(Type::make_pointer_type(lhs_type), obj, |
385 | location); | |
386 | obj = Expression::make_unary(OPERATOR_MULT, obj, location); | |
e440a328 | 387 | } |
2c809f8f | 388 | return Expression::make_compound(check_iface, obj, location); |
e440a328 | 389 | } |
390 | ||
ea664253 | 391 | // Convert an expression to its backend representation. This is implemented by |
392 | // the child class. Not that it is not in general safe to call this multiple | |
e440a328 | 393 | // times for a single expression, but that we don't catch such errors. |
394 | ||
ea664253 | 395 | Bexpression* |
396 | Expression::get_backend(Translate_context* context) | |
e440a328 | 397 | { |
398 | // The child may have marked this expression as having an error. | |
399 | if (this->classification_ == EXPRESSION_ERROR) | |
ea664253 | 400 | return context->backend()->error_expression(); |
e440a328 | 401 | |
ea664253 | 402 | return this->do_get_backend(context); |
e440a328 | 403 | } |
404 | ||
48c2a53a | 405 | // Return a backend expression for VAL. |
406 | Bexpression* | |
407 | Expression::backend_numeric_constant_expression(Translate_context* context, | |
408 | Numeric_constant* val) | |
e440a328 | 409 | { |
48c2a53a | 410 | Gogo* gogo = context->gogo(); |
411 | Type* type = val->type(); | |
412 | if (type == NULL) | |
413 | return gogo->backend()->error_expression(); | |
e440a328 | 414 | |
48c2a53a | 415 | Btype* btype = type->get_backend(gogo); |
416 | Bexpression* ret; | |
417 | if (type->integer_type() != NULL) | |
e440a328 | 418 | { |
419 | mpz_t ival; | |
48c2a53a | 420 | if (!val->to_int(&ival)) |
421 | { | |
422 | go_assert(saw_errors()); | |
423 | return gogo->backend()->error_expression(); | |
424 | } | |
425 | ret = gogo->backend()->integer_constant_expression(btype, ival); | |
e440a328 | 426 | mpz_clear(ival); |
e440a328 | 427 | } |
48c2a53a | 428 | else if (type->float_type() != NULL) |
e440a328 | 429 | { |
48c2a53a | 430 | mpfr_t fval; |
431 | if (!val->to_float(&fval)) | |
432 | { | |
433 | go_assert(saw_errors()); | |
434 | return gogo->backend()->error_expression(); | |
435 | } | |
436 | ret = gogo->backend()->float_constant_expression(btype, fval); | |
437 | mpfr_clear(fval); | |
e440a328 | 438 | } |
48c2a53a | 439 | else if (type->complex_type() != NULL) |
e440a328 | 440 | { |
fcbea5e4 | 441 | mpc_t cval; |
442 | if (!val->to_complex(&cval)) | |
48c2a53a | 443 | { |
444 | go_assert(saw_errors()); | |
445 | return gogo->backend()->error_expression(); | |
446 | } | |
fcbea5e4 | 447 | ret = gogo->backend()->complex_constant_expression(btype, cval); |
448 | mpc_clear(cval); | |
e440a328 | 449 | } |
450 | else | |
c3e6f413 | 451 | go_unreachable(); |
e440a328 | 452 | |
48c2a53a | 453 | return ret; |
e440a328 | 454 | } |
455 | ||
2c809f8f | 456 | // Return an expression which evaluates to true if VAL, of arbitrary integer |
457 | // type, is negative or is more than the maximum value of the Go type "int". | |
e440a328 | 458 | |
2c809f8f | 459 | Expression* |
460 | Expression::check_bounds(Expression* val, Location loc) | |
e440a328 | 461 | { |
2c809f8f | 462 | Type* val_type = val->type(); |
463 | Type* bound_type = Type::lookup_integer_type("int"); | |
464 | ||
465 | int val_type_size; | |
466 | bool val_is_unsigned = false; | |
467 | if (val_type->integer_type() != NULL) | |
468 | { | |
469 | val_type_size = val_type->integer_type()->bits(); | |
470 | val_is_unsigned = val_type->integer_type()->is_unsigned(); | |
471 | } | |
472 | else | |
473 | { | |
474 | if (!val_type->is_numeric_type() | |
475 | || !Type::are_convertible(bound_type, val_type, NULL)) | |
476 | { | |
477 | go_assert(saw_errors()); | |
478 | return Expression::make_boolean(true, loc); | |
479 | } | |
e440a328 | 480 | |
2c809f8f | 481 | if (val_type->complex_type() != NULL) |
482 | val_type_size = val_type->complex_type()->bits(); | |
483 | else | |
484 | val_type_size = val_type->float_type()->bits(); | |
485 | } | |
486 | ||
487 | Expression* negative_index = Expression::make_boolean(false, loc); | |
488 | Expression* index_overflows = Expression::make_boolean(false, loc); | |
489 | if (!val_is_unsigned) | |
e440a328 | 490 | { |
e67508fa | 491 | Expression* zero = Expression::make_integer_ul(0, val_type, loc); |
2c809f8f | 492 | negative_index = Expression::make_binary(OPERATOR_LT, val, zero, loc); |
e440a328 | 493 | } |
494 | ||
2c809f8f | 495 | int bound_type_size = bound_type->integer_type()->bits(); |
c3068ac0 | 496 | if (val_type_size > bound_type_size |
497 | || (val_type_size == bound_type_size | |
2c809f8f | 498 | && val_is_unsigned)) |
499 | { | |
500 | mpz_t one; | |
501 | mpz_init_set_ui(one, 1UL); | |
502 | ||
503 | // maxval = 2^(bound_type_size - 1) - 1 | |
504 | mpz_t maxval; | |
505 | mpz_init(maxval); | |
506 | mpz_mul_2exp(maxval, one, bound_type_size - 1); | |
507 | mpz_sub_ui(maxval, maxval, 1); | |
e67508fa | 508 | Expression* max = Expression::make_integer_z(&maxval, val_type, loc); |
2c809f8f | 509 | mpz_clear(one); |
510 | mpz_clear(maxval); | |
511 | ||
512 | index_overflows = Expression::make_binary(OPERATOR_GT, val, max, loc); | |
e440a328 | 513 | } |
514 | ||
2c809f8f | 515 | return Expression::make_binary(OPERATOR_OROR, negative_index, index_overflows, |
516 | loc); | |
e440a328 | 517 | } |
518 | ||
d751bb78 | 519 | void |
520 | Expression::dump_expression(Ast_dump_context* ast_dump_context) const | |
521 | { | |
522 | this->do_dump_expression(ast_dump_context); | |
523 | } | |
524 | ||
e440a328 | 525 | // Error expressions. This are used to avoid cascading errors. |
526 | ||
527 | class Error_expression : public Expression | |
528 | { | |
529 | public: | |
b13c66cd | 530 | Error_expression(Location location) |
e440a328 | 531 | : Expression(EXPRESSION_ERROR, location) |
532 | { } | |
533 | ||
534 | protected: | |
535 | bool | |
536 | do_is_constant() const | |
537 | { return true; } | |
538 | ||
539 | bool | |
0c77715b | 540 | do_numeric_constant_value(Numeric_constant* nc) const |
e440a328 | 541 | { |
0c77715b | 542 | nc->set_unsigned_long(NULL, 0); |
e440a328 | 543 | return true; |
544 | } | |
545 | ||
4f2138d7 | 546 | bool |
e440a328 | 547 | do_discarding_value() |
4f2138d7 | 548 | { return true; } |
e440a328 | 549 | |
550 | Type* | |
551 | do_type() | |
552 | { return Type::make_error_type(); } | |
553 | ||
554 | void | |
555 | do_determine_type(const Type_context*) | |
556 | { } | |
557 | ||
558 | Expression* | |
559 | do_copy() | |
560 | { return this; } | |
561 | ||
562 | bool | |
563 | do_is_addressable() const | |
564 | { return true; } | |
565 | ||
ea664253 | 566 | Bexpression* |
567 | do_get_backend(Translate_context* context) | |
568 | { return context->backend()->error_expression(); } | |
d751bb78 | 569 | |
570 | void | |
571 | do_dump_expression(Ast_dump_context*) const; | |
e440a328 | 572 | }; |
573 | ||
d751bb78 | 574 | // Dump the ast representation for an error expression to a dump context. |
575 | ||
576 | void | |
577 | Error_expression::do_dump_expression(Ast_dump_context* ast_dump_context) const | |
578 | { | |
579 | ast_dump_context->ostream() << "_Error_" ; | |
580 | } | |
581 | ||
e440a328 | 582 | Expression* |
b13c66cd | 583 | Expression::make_error(Location location) |
e440a328 | 584 | { |
585 | return new Error_expression(location); | |
586 | } | |
587 | ||
588 | // An expression which is really a type. This is used during parsing. | |
589 | // It is an error if these survive after lowering. | |
590 | ||
591 | class | |
592 | Type_expression : public Expression | |
593 | { | |
594 | public: | |
b13c66cd | 595 | Type_expression(Type* type, Location location) |
e440a328 | 596 | : Expression(EXPRESSION_TYPE, location), |
597 | type_(type) | |
598 | { } | |
599 | ||
600 | protected: | |
601 | int | |
602 | do_traverse(Traverse* traverse) | |
603 | { return Type::traverse(this->type_, traverse); } | |
604 | ||
605 | Type* | |
606 | do_type() | |
607 | { return this->type_; } | |
608 | ||
609 | void | |
610 | do_determine_type(const Type_context*) | |
611 | { } | |
612 | ||
613 | void | |
614 | do_check_types(Gogo*) | |
615 | { this->report_error(_("invalid use of type")); } | |
616 | ||
617 | Expression* | |
618 | do_copy() | |
619 | { return this; } | |
620 | ||
ea664253 | 621 | Bexpression* |
622 | do_get_backend(Translate_context*) | |
c3e6f413 | 623 | { go_unreachable(); } |
e440a328 | 624 | |
d751bb78 | 625 | void do_dump_expression(Ast_dump_context*) const; |
626 | ||
e440a328 | 627 | private: |
628 | // The type which we are representing as an expression. | |
629 | Type* type_; | |
630 | }; | |
631 | ||
d751bb78 | 632 | void |
633 | Type_expression::do_dump_expression(Ast_dump_context* ast_dump_context) const | |
634 | { | |
635 | ast_dump_context->dump_type(this->type_); | |
636 | } | |
637 | ||
e440a328 | 638 | Expression* |
b13c66cd | 639 | Expression::make_type(Type* type, Location location) |
e440a328 | 640 | { |
641 | return new Type_expression(type, location); | |
642 | } | |
643 | ||
e03bdf36 | 644 | // Class Parser_expression. |
645 | ||
646 | Type* | |
647 | Parser_expression::do_type() | |
648 | { | |
649 | // We should never really ask for the type of a Parser_expression. | |
650 | // However, it can happen, at least when we have an invalid const | |
651 | // whose initializer refers to the const itself. In that case we | |
652 | // may ask for the type when lowering the const itself. | |
c484d925 | 653 | go_assert(saw_errors()); |
e03bdf36 | 654 | return Type::make_error_type(); |
655 | } | |
656 | ||
e440a328 | 657 | // Class Var_expression. |
658 | ||
659 | // Lower a variable expression. Here we just make sure that the | |
660 | // initialization expression of the variable has been lowered. This | |
661 | // ensures that we will be able to determine the type of the variable | |
662 | // if necessary. | |
663 | ||
664 | Expression* | |
ceeb4318 | 665 | Var_expression::do_lower(Gogo* gogo, Named_object* function, |
666 | Statement_inserter* inserter, int) | |
e440a328 | 667 | { |
668 | if (this->variable_->is_variable()) | |
669 | { | |
670 | Variable* var = this->variable_->var_value(); | |
671 | // This is either a local variable or a global variable. A | |
672 | // reference to a variable which is local to an enclosing | |
673 | // function will be a reference to a field in a closure. | |
674 | if (var->is_global()) | |
ceeb4318 | 675 | { |
676 | function = NULL; | |
677 | inserter = NULL; | |
678 | } | |
679 | var->lower_init_expression(gogo, function, inserter); | |
e440a328 | 680 | } |
681 | return this; | |
682 | } | |
683 | ||
e440a328 | 684 | // Return the type of a reference to a variable. |
685 | ||
686 | Type* | |
687 | Var_expression::do_type() | |
688 | { | |
689 | if (this->variable_->is_variable()) | |
690 | return this->variable_->var_value()->type(); | |
691 | else if (this->variable_->is_result_variable()) | |
692 | return this->variable_->result_var_value()->type(); | |
693 | else | |
c3e6f413 | 694 | go_unreachable(); |
e440a328 | 695 | } |
696 | ||
0ab09e06 | 697 | // Determine the type of a reference to a variable. |
698 | ||
699 | void | |
700 | Var_expression::do_determine_type(const Type_context*) | |
701 | { | |
702 | if (this->variable_->is_variable()) | |
703 | this->variable_->var_value()->determine_type(); | |
704 | } | |
705 | ||
e440a328 | 706 | // Something takes the address of this variable. This means that we |
707 | // may want to move the variable onto the heap. | |
708 | ||
709 | void | |
710 | Var_expression::do_address_taken(bool escapes) | |
711 | { | |
712 | if (!escapes) | |
f325319b | 713 | { |
714 | if (this->variable_->is_variable()) | |
715 | this->variable_->var_value()->set_non_escaping_address_taken(); | |
716 | else if (this->variable_->is_result_variable()) | |
717 | this->variable_->result_var_value()->set_non_escaping_address_taken(); | |
718 | else | |
719 | go_unreachable(); | |
720 | } | |
e440a328 | 721 | else |
f325319b | 722 | { |
723 | if (this->variable_->is_variable()) | |
724 | this->variable_->var_value()->set_address_taken(); | |
725 | else if (this->variable_->is_result_variable()) | |
726 | this->variable_->result_var_value()->set_address_taken(); | |
727 | else | |
728 | go_unreachable(); | |
729 | } | |
45ff893b | 730 | |
731 | if (this->variable_->is_variable() | |
732 | && this->variable_->var_value()->is_in_heap()) | |
733 | { | |
734 | Node::make_node(this)->set_encoding(Node::ESCAPE_HEAP); | |
735 | Node::make_node(this->variable_)->set_encoding(Node::ESCAPE_HEAP); | |
736 | } | |
e440a328 | 737 | } |
738 | ||
ea664253 | 739 | // Get the backend representation for a reference to a variable. |
e440a328 | 740 | |
ea664253 | 741 | Bexpression* |
742 | Var_expression::do_get_backend(Translate_context* context) | |
e440a328 | 743 | { |
fe2f84cf | 744 | Bvariable* bvar = this->variable_->get_backend_variable(context->gogo(), |
745 | context->function()); | |
fe2f84cf | 746 | bool is_in_heap; |
c6777780 | 747 | Location loc = this->location(); |
9b27b43c | 748 | Btype* btype; |
749 | Gogo* gogo = context->gogo(); | |
fe2f84cf | 750 | if (this->variable_->is_variable()) |
9b27b43c | 751 | { |
752 | is_in_heap = this->variable_->var_value()->is_in_heap(); | |
753 | btype = this->variable_->var_value()->type()->get_backend(gogo); | |
754 | } | |
fe2f84cf | 755 | else if (this->variable_->is_result_variable()) |
9b27b43c | 756 | { |
757 | is_in_heap = this->variable_->result_var_value()->is_in_heap(); | |
758 | btype = this->variable_->result_var_value()->type()->get_backend(gogo); | |
759 | } | |
fe2f84cf | 760 | else |
c3e6f413 | 761 | go_unreachable(); |
c6777780 | 762 | |
d4e6573e | 763 | Bexpression* ret = |
764 | context->backend()->var_expression(bvar, this->in_lvalue_pos_, loc); | |
fe2f84cf | 765 | if (is_in_heap) |
9b27b43c | 766 | ret = context->backend()->indirect_expression(btype, ret, true, loc); |
ea664253 | 767 | return ret; |
e440a328 | 768 | } |
769 | ||
d751bb78 | 770 | // Ast dump for variable expression. |
771 | ||
772 | void | |
773 | Var_expression::do_dump_expression(Ast_dump_context* ast_dump_context) const | |
774 | { | |
775 | ast_dump_context->ostream() << this->variable_->name() ; | |
776 | } | |
777 | ||
e440a328 | 778 | // Make a reference to a variable in an expression. |
779 | ||
780 | Expression* | |
b13c66cd | 781 | Expression::make_var_reference(Named_object* var, Location location) |
e440a328 | 782 | { |
783 | if (var->is_sink()) | |
784 | return Expression::make_sink(location); | |
785 | ||
786 | // FIXME: Creating a new object for each reference to a variable is | |
787 | // wasteful. | |
788 | return new Var_expression(var, location); | |
789 | } | |
790 | ||
b0c09712 | 791 | // Class Enclosed_var_expression. |
792 | ||
793 | int | |
794 | Enclosed_var_expression::do_traverse(Traverse*) | |
795 | { | |
796 | return TRAVERSE_CONTINUE; | |
797 | } | |
798 | ||
799 | // Lower the reference to the enclosed variable. | |
800 | ||
801 | Expression* | |
802 | Enclosed_var_expression::do_lower(Gogo* gogo, Named_object* function, | |
803 | Statement_inserter* inserter, int) | |
804 | { | |
805 | gogo->lower_expression(function, inserter, &this->reference_); | |
806 | return this; | |
807 | } | |
808 | ||
809 | // Flatten the reference to the enclosed variable. | |
810 | ||
811 | Expression* | |
812 | Enclosed_var_expression::do_flatten(Gogo* gogo, Named_object* function, | |
813 | Statement_inserter* inserter) | |
814 | { | |
815 | gogo->flatten_expression(function, inserter, &this->reference_); | |
816 | return this; | |
817 | } | |
818 | ||
819 | void | |
820 | Enclosed_var_expression::do_address_taken(bool escapes) | |
821 | { | |
822 | if (!escapes) | |
823 | { | |
824 | if (this->variable_->is_variable()) | |
825 | this->variable_->var_value()->set_non_escaping_address_taken(); | |
826 | else if (this->variable_->is_result_variable()) | |
827 | this->variable_->result_var_value()->set_non_escaping_address_taken(); | |
828 | else | |
829 | go_unreachable(); | |
830 | } | |
831 | else | |
832 | { | |
833 | if (this->variable_->is_variable()) | |
834 | this->variable_->var_value()->set_address_taken(); | |
835 | else if (this->variable_->is_result_variable()) | |
836 | this->variable_->result_var_value()->set_address_taken(); | |
837 | else | |
838 | go_unreachable(); | |
839 | } | |
45ff893b | 840 | |
841 | if (this->variable_->is_variable() | |
842 | && this->variable_->var_value()->is_in_heap()) | |
843 | Node::make_node(this->variable_)->set_encoding(Node::ESCAPE_HEAP); | |
b0c09712 | 844 | } |
845 | ||
846 | // Ast dump for enclosed variable expression. | |
847 | ||
848 | void | |
849 | Enclosed_var_expression::do_dump_expression(Ast_dump_context* adc) const | |
850 | { | |
851 | adc->ostream() << this->variable_->name(); | |
852 | } | |
853 | ||
854 | // Make a reference to a variable within an enclosing function. | |
855 | ||
856 | Expression* | |
857 | Expression::make_enclosing_var_reference(Expression* reference, | |
858 | Named_object* var, Location location) | |
859 | { | |
860 | return new Enclosed_var_expression(reference, var, location); | |
861 | } | |
862 | ||
e440a328 | 863 | // Class Temporary_reference_expression. |
864 | ||
865 | // The type. | |
866 | ||
867 | Type* | |
868 | Temporary_reference_expression::do_type() | |
869 | { | |
870 | return this->statement_->type(); | |
871 | } | |
872 | ||
873 | // Called if something takes the address of this temporary variable. | |
874 | // We never have to move temporary variables to the heap, but we do | |
875 | // need to know that they must live in the stack rather than in a | |
876 | // register. | |
877 | ||
878 | void | |
879 | Temporary_reference_expression::do_address_taken(bool) | |
880 | { | |
881 | this->statement_->set_is_address_taken(); | |
882 | } | |
883 | ||
ea664253 | 884 | // Get a backend expression referring to the variable. |
e440a328 | 885 | |
ea664253 | 886 | Bexpression* |
887 | Temporary_reference_expression::do_get_backend(Translate_context* context) | |
e440a328 | 888 | { |
cd440cff | 889 | Gogo* gogo = context->gogo(); |
eefc1ed3 | 890 | Bvariable* bvar = this->statement_->get_backend_variable(context); |
d4e6573e | 891 | Varexpr_context ve_ctxt = (this->is_lvalue_ ? VE_lvalue : VE_rvalue); |
892 | ||
893 | Bexpression* ret = gogo->backend()->var_expression(bvar, ve_ctxt, | |
894 | this->location()); | |
eefc1ed3 | 895 | |
cd440cff | 896 | // The backend can't always represent the same set of recursive types |
eefc1ed3 | 897 | // that the Go frontend can. In some cases this means that a |
898 | // temporary variable won't have the right backend type. Correct | |
899 | // that here by adding a type cast. We need to use base() to push | |
900 | // the circularity down one level. | |
cd440cff | 901 | Type* stype = this->statement_->type(); |
ceeb4318 | 902 | if (!this->is_lvalue_ |
03118c21 | 903 | && stype->points_to() != NULL |
904 | && stype->points_to()->is_void_type()) | |
eefc1ed3 | 905 | { |
cd440cff | 906 | Btype* btype = this->type()->base()->get_backend(gogo); |
907 | ret = gogo->backend()->convert_expression(btype, ret, this->location()); | |
eefc1ed3 | 908 | } |
ea664253 | 909 | return ret; |
e440a328 | 910 | } |
911 | ||
d751bb78 | 912 | // Ast dump for temporary reference. |
913 | ||
914 | void | |
915 | Temporary_reference_expression::do_dump_expression( | |
916 | Ast_dump_context* ast_dump_context) const | |
917 | { | |
918 | ast_dump_context->dump_temp_variable_name(this->statement_); | |
919 | } | |
920 | ||
e440a328 | 921 | // Make a reference to a temporary variable. |
922 | ||
ceeb4318 | 923 | Temporary_reference_expression* |
e440a328 | 924 | Expression::make_temporary_reference(Temporary_statement* statement, |
b13c66cd | 925 | Location location) |
e440a328 | 926 | { |
927 | return new Temporary_reference_expression(statement, location); | |
928 | } | |
929 | ||
e9d3367e | 930 | // Class Set_and_use_temporary_expression. |
931 | ||
932 | // Return the type. | |
933 | ||
934 | Type* | |
935 | Set_and_use_temporary_expression::do_type() | |
936 | { | |
937 | return this->statement_->type(); | |
938 | } | |
939 | ||
0afbb937 | 940 | // Determine the type of the expression. |
941 | ||
942 | void | |
943 | Set_and_use_temporary_expression::do_determine_type( | |
944 | const Type_context* context) | |
945 | { | |
946 | this->expr_->determine_type(context); | |
947 | } | |
948 | ||
e9d3367e | 949 | // Take the address. |
950 | ||
951 | void | |
952 | Set_and_use_temporary_expression::do_address_taken(bool) | |
953 | { | |
954 | this->statement_->set_is_address_taken(); | |
955 | } | |
956 | ||
957 | // Return the backend representation. | |
958 | ||
ea664253 | 959 | Bexpression* |
960 | Set_and_use_temporary_expression::do_get_backend(Translate_context* context) | |
e9d3367e | 961 | { |
e9d3367e | 962 | Location loc = this->location(); |
a302c105 | 963 | Gogo* gogo = context->gogo(); |
964 | Bvariable* bvar = this->statement_->get_backend_variable(context); | |
d4e6573e | 965 | Bexpression* lvar_ref = gogo->backend()->var_expression(bvar, VE_rvalue, loc); |
a302c105 | 966 | |
0ab48656 | 967 | Named_object* fn = context->function(); |
968 | go_assert(fn != NULL); | |
969 | Bfunction* bfn = fn->func_value()->get_or_make_decl(gogo, fn); | |
ea664253 | 970 | Bexpression* bexpr = this->expr_->get_backend(context); |
0ab48656 | 971 | Bstatement* set = gogo->backend()->assignment_statement(bfn, lvar_ref, |
972 | bexpr, loc); | |
d4e6573e | 973 | Bexpression* var_ref = gogo->backend()->var_expression(bvar, VE_lvalue, loc); |
a302c105 | 974 | Bexpression* ret = gogo->backend()->compound_expression(set, var_ref, loc); |
ea664253 | 975 | return ret; |
e9d3367e | 976 | } |
977 | ||
978 | // Dump. | |
979 | ||
980 | void | |
981 | Set_and_use_temporary_expression::do_dump_expression( | |
982 | Ast_dump_context* ast_dump_context) const | |
983 | { | |
984 | ast_dump_context->ostream() << '('; | |
985 | ast_dump_context->dump_temp_variable_name(this->statement_); | |
986 | ast_dump_context->ostream() << " = "; | |
987 | this->expr_->dump_expression(ast_dump_context); | |
988 | ast_dump_context->ostream() << ')'; | |
989 | } | |
990 | ||
991 | // Make a set-and-use temporary. | |
992 | ||
993 | Set_and_use_temporary_expression* | |
994 | Expression::make_set_and_use_temporary(Temporary_statement* statement, | |
995 | Expression* expr, Location location) | |
996 | { | |
997 | return new Set_and_use_temporary_expression(statement, expr, location); | |
998 | } | |
999 | ||
e440a328 | 1000 | // A sink expression--a use of the blank identifier _. |
1001 | ||
1002 | class Sink_expression : public Expression | |
1003 | { | |
1004 | public: | |
b13c66cd | 1005 | Sink_expression(Location location) |
e440a328 | 1006 | : Expression(EXPRESSION_SINK, location), |
aa93217a | 1007 | type_(NULL), bvar_(NULL) |
e440a328 | 1008 | { } |
1009 | ||
1010 | protected: | |
4f2138d7 | 1011 | bool |
e440a328 | 1012 | do_discarding_value() |
4f2138d7 | 1013 | { return true; } |
e440a328 | 1014 | |
1015 | Type* | |
1016 | do_type(); | |
1017 | ||
1018 | void | |
1019 | do_determine_type(const Type_context*); | |
1020 | ||
1021 | Expression* | |
1022 | do_copy() | |
1023 | { return new Sink_expression(this->location()); } | |
1024 | ||
ea664253 | 1025 | Bexpression* |
1026 | do_get_backend(Translate_context*); | |
e440a328 | 1027 | |
d751bb78 | 1028 | void |
1029 | do_dump_expression(Ast_dump_context*) const; | |
1030 | ||
e440a328 | 1031 | private: |
1032 | // The type of this sink variable. | |
1033 | Type* type_; | |
1034 | // The temporary variable we generate. | |
aa93217a | 1035 | Bvariable* bvar_; |
e440a328 | 1036 | }; |
1037 | ||
1038 | // Return the type of a sink expression. | |
1039 | ||
1040 | Type* | |
1041 | Sink_expression::do_type() | |
1042 | { | |
1043 | if (this->type_ == NULL) | |
1044 | return Type::make_sink_type(); | |
1045 | return this->type_; | |
1046 | } | |
1047 | ||
1048 | // Determine the type of a sink expression. | |
1049 | ||
1050 | void | |
1051 | Sink_expression::do_determine_type(const Type_context* context) | |
1052 | { | |
1053 | if (context->type != NULL) | |
1054 | this->type_ = context->type; | |
1055 | } | |
1056 | ||
1057 | // Return a temporary variable for a sink expression. This will | |
1058 | // presumably be a write-only variable which the middle-end will drop. | |
1059 | ||
ea664253 | 1060 | Bexpression* |
1061 | Sink_expression::do_get_backend(Translate_context* context) | |
e440a328 | 1062 | { |
aa93217a | 1063 | Location loc = this->location(); |
1064 | Gogo* gogo = context->gogo(); | |
1065 | if (this->bvar_ == NULL) | |
e440a328 | 1066 | { |
c484d925 | 1067 | go_assert(this->type_ != NULL && !this->type_->is_sink_type()); |
aa93217a | 1068 | Named_object* fn = context->function(); |
1069 | go_assert(fn != NULL); | |
1070 | Bfunction* fn_ctx = fn->func_value()->get_or_make_decl(gogo, fn); | |
9f0e0513 | 1071 | Btype* bt = this->type_->get_backend(context->gogo()); |
aa93217a | 1072 | Bstatement* decl; |
1073 | this->bvar_ = | |
1074 | gogo->backend()->temporary_variable(fn_ctx, context->bblock(), bt, NULL, | |
1075 | false, loc, &decl); | |
d4e6573e | 1076 | Bexpression* var_ref = |
1077 | gogo->backend()->var_expression(this->bvar_, VE_lvalue, loc); | |
aa93217a | 1078 | var_ref = gogo->backend()->compound_expression(decl, var_ref, loc); |
ea664253 | 1079 | return var_ref; |
e440a328 | 1080 | } |
d4e6573e | 1081 | return gogo->backend()->var_expression(this->bvar_, VE_lvalue, loc); |
e440a328 | 1082 | } |
1083 | ||
d751bb78 | 1084 | // Ast dump for sink expression. |
1085 | ||
1086 | void | |
1087 | Sink_expression::do_dump_expression(Ast_dump_context* ast_dump_context) const | |
1088 | { | |
1089 | ast_dump_context->ostream() << "_" ; | |
1090 | } | |
1091 | ||
e440a328 | 1092 | // Make a sink expression. |
1093 | ||
1094 | Expression* | |
b13c66cd | 1095 | Expression::make_sink(Location location) |
e440a328 | 1096 | { |
1097 | return new Sink_expression(location); | |
1098 | } | |
1099 | ||
1100 | // Class Func_expression. | |
1101 | ||
1102 | // FIXME: Can a function expression appear in a constant expression? | |
1103 | // The value is unchanging. Initializing a constant to the address of | |
1104 | // a function seems like it could work, though there might be little | |
1105 | // point to it. | |
1106 | ||
e440a328 | 1107 | // Traversal. |
1108 | ||
1109 | int | |
1110 | Func_expression::do_traverse(Traverse* traverse) | |
1111 | { | |
1112 | return (this->closure_ == NULL | |
1113 | ? TRAVERSE_CONTINUE | |
1114 | : Expression::traverse(&this->closure_, traverse)); | |
1115 | } | |
1116 | ||
1117 | // Return the type of a function expression. | |
1118 | ||
1119 | Type* | |
1120 | Func_expression::do_type() | |
1121 | { | |
1122 | if (this->function_->is_function()) | |
1123 | return this->function_->func_value()->type(); | |
1124 | else if (this->function_->is_function_declaration()) | |
1125 | return this->function_->func_declaration_value()->type(); | |
1126 | else | |
c3e6f413 | 1127 | go_unreachable(); |
e440a328 | 1128 | } |
1129 | ||
ea664253 | 1130 | // Get the backend representation for the code of a function expression. |
e440a328 | 1131 | |
97267c39 | 1132 | Bexpression* |
8381eda7 | 1133 | Func_expression::get_code_pointer(Gogo* gogo, Named_object* no, Location loc) |
e440a328 | 1134 | { |
1135 | Function_type* fntype; | |
8381eda7 | 1136 | if (no->is_function()) |
1137 | fntype = no->func_value()->type(); | |
1138 | else if (no->is_function_declaration()) | |
1139 | fntype = no->func_declaration_value()->type(); | |
e440a328 | 1140 | else |
c3e6f413 | 1141 | go_unreachable(); |
e440a328 | 1142 | |
1143 | // Builtin functions are handled specially by Call_expression. We | |
1144 | // can't take their address. | |
1145 | if (fntype->is_builtin()) | |
1146 | { | |
631d5788 | 1147 | go_error_at(loc, |
1148 | "invalid use of special builtin function %qs; must be called", | |
1149 | no->message_name().c_str()); | |
97267c39 | 1150 | return gogo->backend()->error_expression(); |
e440a328 | 1151 | } |
1152 | ||
97267c39 | 1153 | Bfunction* fndecl; |
e440a328 | 1154 | if (no->is_function()) |
cf3cae55 | 1155 | fndecl = no->func_value()->get_or_make_decl(gogo, no); |
e440a328 | 1156 | else if (no->is_function_declaration()) |
cf3cae55 | 1157 | fndecl = no->func_declaration_value()->get_or_make_decl(gogo, no); |
e440a328 | 1158 | else |
c3e6f413 | 1159 | go_unreachable(); |
e440a328 | 1160 | |
97267c39 | 1161 | return gogo->backend()->function_code_expression(fndecl, loc); |
e440a328 | 1162 | } |
1163 | ||
ea664253 | 1164 | // Get the backend representation for a function expression. This is used when |
1165 | // we take the address of a function rather than simply calling it. A func | |
8381eda7 | 1166 | // value is represented as a pointer to a block of memory. The first |
1167 | // word of that memory is a pointer to the function code. The | |
1168 | // remaining parts of that memory are the addresses of variables that | |
1169 | // the function closes over. | |
e440a328 | 1170 | |
ea664253 | 1171 | Bexpression* |
1172 | Func_expression::do_get_backend(Translate_context* context) | |
e440a328 | 1173 | { |
8381eda7 | 1174 | // If there is no closure, just use the function descriptor. |
2010c17a | 1175 | if (this->closure_ == NULL) |
8381eda7 | 1176 | { |
1177 | Gogo* gogo = context->gogo(); | |
1178 | Named_object* no = this->function_; | |
1179 | Expression* descriptor; | |
1180 | if (no->is_function()) | |
1181 | descriptor = no->func_value()->descriptor(gogo, no); | |
1182 | else if (no->is_function_declaration()) | |
1183 | { | |
1184 | if (no->func_declaration_value()->type()->is_builtin()) | |
1185 | { | |
631d5788 | 1186 | go_error_at(this->location(), |
1187 | ("invalid use of special builtin function %qs; " | |
1188 | "must be called"), | |
1189 | no->message_name().c_str()); | |
ea664253 | 1190 | return gogo->backend()->error_expression(); |
8381eda7 | 1191 | } |
1192 | descriptor = no->func_declaration_value()->descriptor(gogo, no); | |
1193 | } | |
1194 | else | |
1195 | go_unreachable(); | |
2010c17a | 1196 | |
ea664253 | 1197 | Bexpression* bdesc = descriptor->get_backend(context); |
1198 | return gogo->backend()->address_expression(bdesc, this->location()); | |
8381eda7 | 1199 | } |
e440a328 | 1200 | |
8381eda7 | 1201 | go_assert(this->function_->func_value()->enclosing() != NULL); |
e440a328 | 1202 | |
8381eda7 | 1203 | // If there is a closure, then the closure is itself the function |
1204 | // expression. It is a pointer to a struct whose first field points | |
1205 | // to the function code and whose remaining fields are the addresses | |
1206 | // of the closed-over variables. | |
ea664253 | 1207 | return this->closure_->get_backend(context); |
e440a328 | 1208 | } |
1209 | ||
d751bb78 | 1210 | // Ast dump for function. |
1211 | ||
1212 | void | |
1213 | Func_expression::do_dump_expression(Ast_dump_context* ast_dump_context) const | |
1214 | { | |
8b1c301d | 1215 | ast_dump_context->ostream() << this->function_->name(); |
1216 | if (this->closure_ != NULL) | |
1217 | { | |
1218 | ast_dump_context->ostream() << " {closure = "; | |
1219 | this->closure_->dump_expression(ast_dump_context); | |
1220 | ast_dump_context->ostream() << "}"; | |
1221 | } | |
d751bb78 | 1222 | } |
1223 | ||
e440a328 | 1224 | // Make a reference to a function in an expression. |
1225 | ||
1226 | Expression* | |
1227 | Expression::make_func_reference(Named_object* function, Expression* closure, | |
b13c66cd | 1228 | Location location) |
e440a328 | 1229 | { |
b1d7ecfa | 1230 | Func_expression* fe = new Func_expression(function, closure, location); |
1231 | ||
1232 | // Detect references to builtin functions and set the runtime code if | |
1233 | // appropriate. | |
1234 | if (function->is_function_declaration()) | |
1235 | fe->set_runtime_code(Runtime::name_to_code(function->name())); | |
1236 | return fe; | |
e440a328 | 1237 | } |
1238 | ||
c6837989 | 1239 | // Class Func_descriptor_expression. |
8381eda7 | 1240 | |
c6837989 | 1241 | // Constructor. |
8381eda7 | 1242 | |
c6837989 | 1243 | Func_descriptor_expression::Func_descriptor_expression(Named_object* fn) |
1244 | : Expression(EXPRESSION_FUNC_DESCRIPTOR, fn->location()), | |
f8bdf81a | 1245 | fn_(fn), dvar_(NULL) |
c6837989 | 1246 | { |
1247 | go_assert(!fn->is_function() || !fn->func_value()->needs_closure()); | |
1248 | } | |
8381eda7 | 1249 | |
c6837989 | 1250 | // Traversal. |
8381eda7 | 1251 | |
c6837989 | 1252 | int |
1253 | Func_descriptor_expression::do_traverse(Traverse*) | |
1254 | { | |
1255 | return TRAVERSE_CONTINUE; | |
1256 | } | |
8381eda7 | 1257 | |
1258 | // All function descriptors have the same type. | |
1259 | ||
1260 | Type* Func_descriptor_expression::descriptor_type; | |
1261 | ||
1262 | void | |
1263 | Func_descriptor_expression::make_func_descriptor_type() | |
1264 | { | |
1265 | if (Func_descriptor_expression::descriptor_type != NULL) | |
1266 | return; | |
1267 | Type* uintptr_type = Type::lookup_integer_type("uintptr"); | |
1268 | Type* struct_type = Type::make_builtin_struct_type(1, "code", uintptr_type); | |
1269 | Func_descriptor_expression::descriptor_type = | |
1270 | Type::make_builtin_named_type("functionDescriptor", struct_type); | |
1271 | } | |
1272 | ||
1273 | Type* | |
1274 | Func_descriptor_expression::do_type() | |
1275 | { | |
1276 | Func_descriptor_expression::make_func_descriptor_type(); | |
1277 | return Func_descriptor_expression::descriptor_type; | |
1278 | } | |
1279 | ||
ea664253 | 1280 | // The backend representation for a function descriptor. |
8381eda7 | 1281 | |
ea664253 | 1282 | Bexpression* |
1283 | Func_descriptor_expression::do_get_backend(Translate_context* context) | |
8381eda7 | 1284 | { |
8381eda7 | 1285 | Named_object* no = this->fn_; |
1286 | Location loc = no->location(); | |
ea664253 | 1287 | if (this->dvar_ != NULL) |
d4e6573e | 1288 | return context->backend()->var_expression(this->dvar_, VE_rvalue, loc); |
8381eda7 | 1289 | |
ea664253 | 1290 | Gogo* gogo = context->gogo(); |
8381eda7 | 1291 | std::string var_name; |
09e57698 | 1292 | bool is_descriptor = false; |
1293 | if (no->is_function_declaration() | |
1294 | && !no->func_declaration_value()->asm_name().empty() | |
1295 | && Linemap::is_predeclared_location(no->location())) | |
1296 | { | |
6098d6cb | 1297 | if (no->func_declaration_value()->asm_name().substr(0, 8) != "runtime.") |
1298 | var_name = no->func_declaration_value()->asm_name() + "_descriptor"; | |
1299 | else | |
1300 | var_name = no->func_declaration_value()->asm_name() + "$descriptor"; | |
09e57698 | 1301 | is_descriptor = true; |
1302 | } | |
8381eda7 | 1303 | else |
09e57698 | 1304 | { |
1305 | if (no->package() == NULL) | |
1306 | var_name = gogo->pkgpath_symbol(); | |
1307 | else | |
1308 | var_name = no->package()->pkgpath_symbol(); | |
1309 | var_name.push_back('.'); | |
1310 | var_name.append(Gogo::unpack_hidden_name(no->name())); | |
1311 | var_name.append("$descriptor"); | |
1312 | } | |
8381eda7 | 1313 | |
1314 | Btype* btype = this->type()->get_backend(gogo); | |
1315 | ||
1316 | Bvariable* bvar; | |
438b4bec | 1317 | std::string asm_name(go_selectively_encode_id(var_name)); |
09e57698 | 1318 | if (no->package() != NULL || is_descriptor) |
438b4bec | 1319 | bvar = context->backend()->immutable_struct_reference(var_name, asm_name, |
1320 | btype, loc); | |
8381eda7 | 1321 | else |
1322 | { | |
1323 | Location bloc = Linemap::predeclared_location(); | |
1324 | bool is_hidden = ((no->is_function() | |
1325 | && no->func_value()->enclosing() != NULL) | |
1326 | || Gogo::is_thunk(no)); | |
438b4bec | 1327 | bvar = context->backend()->immutable_struct(var_name, asm_name, |
1328 | is_hidden, false, | |
8381eda7 | 1329 | btype, bloc); |
1330 | Expression_list* vals = new Expression_list(); | |
f8bdf81a | 1331 | vals->push_back(Expression::make_func_code_reference(this->fn_, bloc)); |
8381eda7 | 1332 | Expression* init = |
1333 | Expression::make_struct_composite_literal(this->type(), vals, bloc); | |
1334 | Translate_context bcontext(gogo, NULL, NULL, NULL); | |
1335 | bcontext.set_is_const(); | |
ea664253 | 1336 | Bexpression* binit = init->get_backend(&bcontext); |
8381eda7 | 1337 | context->backend()->immutable_struct_set_init(bvar, var_name, is_hidden, |
1338 | false, btype, bloc, binit); | |
1339 | } | |
1340 | ||
1341 | this->dvar_ = bvar; | |
d4e6573e | 1342 | return gogo->backend()->var_expression(bvar, VE_rvalue, loc); |
8381eda7 | 1343 | } |
1344 | ||
c6837989 | 1345 | // Print a function descriptor expression. |
1346 | ||
1347 | void | |
1348 | Func_descriptor_expression::do_dump_expression(Ast_dump_context* context) const | |
1349 | { | |
1350 | context->ostream() << "[descriptor " << this->fn_->name() << "]"; | |
1351 | } | |
1352 | ||
8381eda7 | 1353 | // Make a function descriptor expression. |
1354 | ||
c6837989 | 1355 | Func_descriptor_expression* |
1356 | Expression::make_func_descriptor(Named_object* fn) | |
8381eda7 | 1357 | { |
c6837989 | 1358 | return new Func_descriptor_expression(fn); |
8381eda7 | 1359 | } |
1360 | ||
1361 | // Make the function descriptor type, so that it can be converted. | |
1362 | ||
1363 | void | |
1364 | Expression::make_func_descriptor_type() | |
1365 | { | |
1366 | Func_descriptor_expression::make_func_descriptor_type(); | |
1367 | } | |
1368 | ||
1369 | // A reference to just the code of a function. | |
1370 | ||
1371 | class Func_code_reference_expression : public Expression | |
1372 | { | |
1373 | public: | |
1374 | Func_code_reference_expression(Named_object* function, Location location) | |
1375 | : Expression(EXPRESSION_FUNC_CODE_REFERENCE, location), | |
1376 | function_(function) | |
1377 | { } | |
1378 | ||
1379 | protected: | |
1380 | int | |
1381 | do_traverse(Traverse*) | |
1382 | { return TRAVERSE_CONTINUE; } | |
1383 | ||
f9ca30f9 | 1384 | bool |
3ae06f68 | 1385 | do_is_static_initializer() const |
f9ca30f9 | 1386 | { return true; } |
1387 | ||
8381eda7 | 1388 | Type* |
1389 | do_type() | |
1390 | { return Type::make_pointer_type(Type::make_void_type()); } | |
1391 | ||
1392 | void | |
1393 | do_determine_type(const Type_context*) | |
1394 | { } | |
1395 | ||
1396 | Expression* | |
1397 | do_copy() | |
1398 | { | |
1399 | return Expression::make_func_code_reference(this->function_, | |
1400 | this->location()); | |
1401 | } | |
1402 | ||
ea664253 | 1403 | Bexpression* |
1404 | do_get_backend(Translate_context*); | |
8381eda7 | 1405 | |
1406 | void | |
1407 | do_dump_expression(Ast_dump_context* context) const | |
1408 | { context->ostream() << "[raw " << this->function_->name() << "]" ; } | |
1409 | ||
1410 | private: | |
1411 | // The function. | |
1412 | Named_object* function_; | |
1413 | }; | |
1414 | ||
ea664253 | 1415 | // Get the backend representation for a reference to function code. |
8381eda7 | 1416 | |
ea664253 | 1417 | Bexpression* |
1418 | Func_code_reference_expression::do_get_backend(Translate_context* context) | |
8381eda7 | 1419 | { |
ea664253 | 1420 | return Func_expression::get_code_pointer(context->gogo(), this->function_, |
1421 | this->location()); | |
8381eda7 | 1422 | } |
1423 | ||
1424 | // Make a reference to the code of a function. | |
1425 | ||
1426 | Expression* | |
1427 | Expression::make_func_code_reference(Named_object* function, Location location) | |
1428 | { | |
1429 | return new Func_code_reference_expression(function, location); | |
1430 | } | |
1431 | ||
e440a328 | 1432 | // Class Unknown_expression. |
1433 | ||
1434 | // Return the name of an unknown expression. | |
1435 | ||
1436 | const std::string& | |
1437 | Unknown_expression::name() const | |
1438 | { | |
1439 | return this->named_object_->name(); | |
1440 | } | |
1441 | ||
1442 | // Lower a reference to an unknown name. | |
1443 | ||
1444 | Expression* | |
ceeb4318 | 1445 | Unknown_expression::do_lower(Gogo*, Named_object*, Statement_inserter*, int) |
e440a328 | 1446 | { |
b13c66cd | 1447 | Location location = this->location(); |
e440a328 | 1448 | Named_object* no = this->named_object_; |
deded542 | 1449 | Named_object* real; |
1450 | if (!no->is_unknown()) | |
1451 | real = no; | |
1452 | else | |
e440a328 | 1453 | { |
deded542 | 1454 | real = no->unknown_value()->real_named_object(); |
1455 | if (real == NULL) | |
1456 | { | |
1457 | if (this->is_composite_literal_key_) | |
1458 | return this; | |
acf8e158 | 1459 | if (!this->no_error_message_) |
631d5788 | 1460 | go_error_at(location, "reference to undefined name %qs", |
1461 | this->named_object_->message_name().c_str()); | |
deded542 | 1462 | return Expression::make_error(location); |
1463 | } | |
e440a328 | 1464 | } |
1465 | switch (real->classification()) | |
1466 | { | |
1467 | case Named_object::NAMED_OBJECT_CONST: | |
1468 | return Expression::make_const_reference(real, location); | |
1469 | case Named_object::NAMED_OBJECT_TYPE: | |
1470 | return Expression::make_type(real->type_value(), location); | |
1471 | case Named_object::NAMED_OBJECT_TYPE_DECLARATION: | |
1472 | if (this->is_composite_literal_key_) | |
1473 | return this; | |
acf8e158 | 1474 | if (!this->no_error_message_) |
631d5788 | 1475 | go_error_at(location, "reference to undefined type %qs", |
1476 | real->message_name().c_str()); | |
e440a328 | 1477 | return Expression::make_error(location); |
1478 | case Named_object::NAMED_OBJECT_VAR: | |
7d834090 | 1479 | real->var_value()->set_is_used(); |
e440a328 | 1480 | return Expression::make_var_reference(real, location); |
1481 | case Named_object::NAMED_OBJECT_FUNC: | |
1482 | case Named_object::NAMED_OBJECT_FUNC_DECLARATION: | |
1483 | return Expression::make_func_reference(real, NULL, location); | |
1484 | case Named_object::NAMED_OBJECT_PACKAGE: | |
1485 | if (this->is_composite_literal_key_) | |
1486 | return this; | |
acf8e158 | 1487 | if (!this->no_error_message_) |
631d5788 | 1488 | go_error_at(location, "unexpected reference to package"); |
e440a328 | 1489 | return Expression::make_error(location); |
1490 | default: | |
c3e6f413 | 1491 | go_unreachable(); |
e440a328 | 1492 | } |
1493 | } | |
1494 | ||
d751bb78 | 1495 | // Dump the ast representation for an unknown expression to a dump context. |
1496 | ||
1497 | void | |
1498 | Unknown_expression::do_dump_expression(Ast_dump_context* ast_dump_context) const | |
1499 | { | |
1500 | ast_dump_context->ostream() << "_Unknown_(" << this->named_object_->name() | |
1501 | << ")"; | |
d751bb78 | 1502 | } |
1503 | ||
e440a328 | 1504 | // Make a reference to an unknown name. |
1505 | ||
acf8e158 | 1506 | Unknown_expression* |
b13c66cd | 1507 | Expression::make_unknown_reference(Named_object* no, Location location) |
e440a328 | 1508 | { |
e440a328 | 1509 | return new Unknown_expression(no, location); |
1510 | } | |
1511 | ||
1512 | // A boolean expression. | |
1513 | ||
1514 | class Boolean_expression : public Expression | |
1515 | { | |
1516 | public: | |
b13c66cd | 1517 | Boolean_expression(bool val, Location location) |
e440a328 | 1518 | : Expression(EXPRESSION_BOOLEAN, location), |
1519 | val_(val), type_(NULL) | |
1520 | { } | |
1521 | ||
1522 | static Expression* | |
1523 | do_import(Import*); | |
1524 | ||
1525 | protected: | |
1526 | bool | |
1527 | do_is_constant() const | |
1528 | { return true; } | |
1529 | ||
0e168074 | 1530 | bool |
3ae06f68 | 1531 | do_is_static_initializer() const |
0e168074 | 1532 | { return true; } |
1533 | ||
e440a328 | 1534 | Type* |
1535 | do_type(); | |
1536 | ||
1537 | void | |
1538 | do_determine_type(const Type_context*); | |
1539 | ||
1540 | Expression* | |
1541 | do_copy() | |
1542 | { return this; } | |
1543 | ||
ea664253 | 1544 | Bexpression* |
1545 | do_get_backend(Translate_context* context) | |
1546 | { return context->backend()->boolean_constant_expression(this->val_); } | |
e440a328 | 1547 | |
1548 | void | |
1549 | do_export(Export* exp) const | |
1550 | { exp->write_c_string(this->val_ ? "true" : "false"); } | |
1551 | ||
d751bb78 | 1552 | void |
1553 | do_dump_expression(Ast_dump_context* ast_dump_context) const | |
1554 | { ast_dump_context->ostream() << (this->val_ ? "true" : "false"); } | |
1555 | ||
e440a328 | 1556 | private: |
1557 | // The constant. | |
1558 | bool val_; | |
1559 | // The type as determined by context. | |
1560 | Type* type_; | |
1561 | }; | |
1562 | ||
1563 | // Get the type. | |
1564 | ||
1565 | Type* | |
1566 | Boolean_expression::do_type() | |
1567 | { | |
1568 | if (this->type_ == NULL) | |
1569 | this->type_ = Type::make_boolean_type(); | |
1570 | return this->type_; | |
1571 | } | |
1572 | ||
1573 | // Set the type from the context. | |
1574 | ||
1575 | void | |
1576 | Boolean_expression::do_determine_type(const Type_context* context) | |
1577 | { | |
1578 | if (this->type_ != NULL && !this->type_->is_abstract()) | |
1579 | ; | |
1580 | else if (context->type != NULL && context->type->is_boolean_type()) | |
1581 | this->type_ = context->type; | |
1582 | else if (!context->may_be_abstract) | |
1583 | this->type_ = Type::lookup_bool_type(); | |
1584 | } | |
1585 | ||
1586 | // Import a boolean constant. | |
1587 | ||
1588 | Expression* | |
1589 | Boolean_expression::do_import(Import* imp) | |
1590 | { | |
1591 | if (imp->peek_char() == 't') | |
1592 | { | |
1593 | imp->require_c_string("true"); | |
1594 | return Expression::make_boolean(true, imp->location()); | |
1595 | } | |
1596 | else | |
1597 | { | |
1598 | imp->require_c_string("false"); | |
1599 | return Expression::make_boolean(false, imp->location()); | |
1600 | } | |
1601 | } | |
1602 | ||
1603 | // Make a boolean expression. | |
1604 | ||
1605 | Expression* | |
b13c66cd | 1606 | Expression::make_boolean(bool val, Location location) |
e440a328 | 1607 | { |
1608 | return new Boolean_expression(val, location); | |
1609 | } | |
1610 | ||
1611 | // Class String_expression. | |
1612 | ||
1613 | // Get the type. | |
1614 | ||
1615 | Type* | |
1616 | String_expression::do_type() | |
1617 | { | |
1618 | if (this->type_ == NULL) | |
1619 | this->type_ = Type::make_string_type(); | |
1620 | return this->type_; | |
1621 | } | |
1622 | ||
1623 | // Set the type from the context. | |
1624 | ||
1625 | void | |
1626 | String_expression::do_determine_type(const Type_context* context) | |
1627 | { | |
1628 | if (this->type_ != NULL && !this->type_->is_abstract()) | |
1629 | ; | |
1630 | else if (context->type != NULL && context->type->is_string_type()) | |
1631 | this->type_ = context->type; | |
1632 | else if (!context->may_be_abstract) | |
1633 | this->type_ = Type::lookup_string_type(); | |
1634 | } | |
1635 | ||
1636 | // Build a string constant. | |
1637 | ||
ea664253 | 1638 | Bexpression* |
1639 | String_expression::do_get_backend(Translate_context* context) | |
e440a328 | 1640 | { |
2c809f8f | 1641 | Gogo* gogo = context->gogo(); |
1642 | Btype* btype = Type::make_string_type()->get_backend(gogo); | |
1643 | ||
1644 | Location loc = this->location(); | |
1645 | std::vector<Bexpression*> init(2); | |
1646 | Bexpression* str_cst = | |
1647 | gogo->backend()->string_constant_expression(this->val_); | |
1648 | init[0] = gogo->backend()->address_expression(str_cst, loc); | |
1649 | ||
1650 | Btype* int_btype = Type::lookup_integer_type("int")->get_backend(gogo); | |
1651 | mpz_t lenval; | |
1652 | mpz_init_set_ui(lenval, this->val_.length()); | |
1653 | init[1] = gogo->backend()->integer_constant_expression(int_btype, lenval); | |
1654 | mpz_clear(lenval); | |
1655 | ||
ea664253 | 1656 | return gogo->backend()->constructor_expression(btype, init, loc); |
e440a328 | 1657 | } |
1658 | ||
8b1c301d | 1659 | // Write string literal to string dump. |
e440a328 | 1660 | |
1661 | void | |
8b1c301d | 1662 | String_expression::export_string(String_dump* exp, |
1663 | const String_expression* str) | |
e440a328 | 1664 | { |
1665 | std::string s; | |
8b1c301d | 1666 | s.reserve(str->val_.length() * 4 + 2); |
e440a328 | 1667 | s += '"'; |
8b1c301d | 1668 | for (std::string::const_iterator p = str->val_.begin(); |
1669 | p != str->val_.end(); | |
e440a328 | 1670 | ++p) |
1671 | { | |
1672 | if (*p == '\\' || *p == '"') | |
1673 | { | |
1674 | s += '\\'; | |
1675 | s += *p; | |
1676 | } | |
1677 | else if (*p >= 0x20 && *p < 0x7f) | |
1678 | s += *p; | |
1679 | else if (*p == '\n') | |
1680 | s += "\\n"; | |
1681 | else if (*p == '\t') | |
1682 | s += "\\t"; | |
1683 | else | |
1684 | { | |
1685 | s += "\\x"; | |
1686 | unsigned char c = *p; | |
1687 | unsigned int dig = c >> 4; | |
1688 | s += dig < 10 ? '0' + dig : 'A' + dig - 10; | |
1689 | dig = c & 0xf; | |
1690 | s += dig < 10 ? '0' + dig : 'A' + dig - 10; | |
1691 | } | |
1692 | } | |
1693 | s += '"'; | |
1694 | exp->write_string(s); | |
1695 | } | |
1696 | ||
8b1c301d | 1697 | // Export a string expression. |
1698 | ||
1699 | void | |
1700 | String_expression::do_export(Export* exp) const | |
1701 | { | |
1702 | String_expression::export_string(exp, this); | |
1703 | } | |
1704 | ||
e440a328 | 1705 | // Import a string expression. |
1706 | ||
1707 | Expression* | |
1708 | String_expression::do_import(Import* imp) | |
1709 | { | |
1710 | imp->require_c_string("\""); | |
1711 | std::string val; | |
1712 | while (true) | |
1713 | { | |
1714 | int c = imp->get_char(); | |
1715 | if (c == '"' || c == -1) | |
1716 | break; | |
1717 | if (c != '\\') | |
1718 | val += static_cast<char>(c); | |
1719 | else | |
1720 | { | |
1721 | c = imp->get_char(); | |
1722 | if (c == '\\' || c == '"') | |
1723 | val += static_cast<char>(c); | |
1724 | else if (c == 'n') | |
1725 | val += '\n'; | |
1726 | else if (c == 't') | |
1727 | val += '\t'; | |
1728 | else if (c == 'x') | |
1729 | { | |
1730 | c = imp->get_char(); | |
1731 | unsigned int vh = c >= '0' && c <= '9' ? c - '0' : c - 'A' + 10; | |
1732 | c = imp->get_char(); | |
1733 | unsigned int vl = c >= '0' && c <= '9' ? c - '0' : c - 'A' + 10; | |
1734 | char v = (vh << 4) | vl; | |
1735 | val += v; | |
1736 | } | |
1737 | else | |
1738 | { | |
631d5788 | 1739 | go_error_at(imp->location(), "bad string constant"); |
e440a328 | 1740 | return Expression::make_error(imp->location()); |
1741 | } | |
1742 | } | |
1743 | } | |
1744 | return Expression::make_string(val, imp->location()); | |
1745 | } | |
1746 | ||
d751bb78 | 1747 | // Ast dump for string expression. |
1748 | ||
1749 | void | |
1750 | String_expression::do_dump_expression(Ast_dump_context* ast_dump_context) const | |
1751 | { | |
8b1c301d | 1752 | String_expression::export_string(ast_dump_context, this); |
d751bb78 | 1753 | } |
1754 | ||
e440a328 | 1755 | // Make a string expression. |
1756 | ||
1757 | Expression* | |
b13c66cd | 1758 | Expression::make_string(const std::string& val, Location location) |
e440a328 | 1759 | { |
1760 | return new String_expression(val, location); | |
1761 | } | |
1762 | ||
2c809f8f | 1763 | // An expression that evaluates to some characteristic of a string. |
1764 | // This is used when indexing, bound-checking, or nil checking a string. | |
1765 | ||
1766 | class String_info_expression : public Expression | |
1767 | { | |
1768 | public: | |
1769 | String_info_expression(Expression* string, String_info string_info, | |
1770 | Location location) | |
1771 | : Expression(EXPRESSION_STRING_INFO, location), | |
1772 | string_(string), string_info_(string_info) | |
1773 | { } | |
1774 | ||
1775 | protected: | |
1776 | Type* | |
1777 | do_type(); | |
1778 | ||
1779 | void | |
1780 | do_determine_type(const Type_context*) | |
1781 | { go_unreachable(); } | |
1782 | ||
1783 | Expression* | |
1784 | do_copy() | |
1785 | { | |
1786 | return new String_info_expression(this->string_->copy(), this->string_info_, | |
1787 | this->location()); | |
1788 | } | |
1789 | ||
ea664253 | 1790 | Bexpression* |
1791 | do_get_backend(Translate_context* context); | |
2c809f8f | 1792 | |
1793 | void | |
1794 | do_dump_expression(Ast_dump_context*) const; | |
1795 | ||
1796 | void | |
1797 | do_issue_nil_check() | |
1798 | { this->string_->issue_nil_check(); } | |
1799 | ||
1800 | private: | |
1801 | // The string for which we are getting information. | |
1802 | Expression* string_; | |
1803 | // What information we want. | |
1804 | String_info string_info_; | |
1805 | }; | |
1806 | ||
1807 | // Return the type of the string info. | |
1808 | ||
1809 | Type* | |
1810 | String_info_expression::do_type() | |
1811 | { | |
1812 | switch (this->string_info_) | |
1813 | { | |
1814 | case STRING_INFO_DATA: | |
1815 | { | |
1816 | Type* byte_type = Type::lookup_integer_type("uint8"); | |
1817 | return Type::make_pointer_type(byte_type); | |
1818 | } | |
1819 | case STRING_INFO_LENGTH: | |
1820 | return Type::lookup_integer_type("int"); | |
1821 | default: | |
1822 | go_unreachable(); | |
1823 | } | |
1824 | } | |
1825 | ||
1826 | // Return string information in GENERIC. | |
1827 | ||
ea664253 | 1828 | Bexpression* |
1829 | String_info_expression::do_get_backend(Translate_context* context) | |
2c809f8f | 1830 | { |
1831 | Gogo* gogo = context->gogo(); | |
1832 | ||
ea664253 | 1833 | Bexpression* bstring = this->string_->get_backend(context); |
2c809f8f | 1834 | switch (this->string_info_) |
1835 | { | |
1836 | case STRING_INFO_DATA: | |
1837 | case STRING_INFO_LENGTH: | |
ea664253 | 1838 | return gogo->backend()->struct_field_expression(bstring, |
1839 | this->string_info_, | |
1840 | this->location()); | |
2c809f8f | 1841 | break; |
1842 | default: | |
1843 | go_unreachable(); | |
1844 | } | |
2c809f8f | 1845 | } |
1846 | ||
1847 | // Dump ast representation for a type info expression. | |
1848 | ||
1849 | void | |
1850 | String_info_expression::do_dump_expression( | |
1851 | Ast_dump_context* ast_dump_context) const | |
1852 | { | |
1853 | ast_dump_context->ostream() << "stringinfo("; | |
1854 | this->string_->dump_expression(ast_dump_context); | |
1855 | ast_dump_context->ostream() << ","; | |
1856 | ast_dump_context->ostream() << | |
1857 | (this->string_info_ == STRING_INFO_DATA ? "data" | |
1858 | : this->string_info_ == STRING_INFO_LENGTH ? "length" | |
1859 | : "unknown"); | |
1860 | ast_dump_context->ostream() << ")"; | |
1861 | } | |
1862 | ||
1863 | // Make a string info expression. | |
1864 | ||
1865 | Expression* | |
1866 | Expression::make_string_info(Expression* string, String_info string_info, | |
1867 | Location location) | |
1868 | { | |
1869 | return new String_info_expression(string, string_info, location); | |
1870 | } | |
1871 | ||
e440a328 | 1872 | // Make an integer expression. |
1873 | ||
1874 | class Integer_expression : public Expression | |
1875 | { | |
1876 | public: | |
5d4b8566 | 1877 | Integer_expression(const mpz_t* val, Type* type, bool is_character_constant, |
1878 | Location location) | |
e440a328 | 1879 | : Expression(EXPRESSION_INTEGER, location), |
5d4b8566 | 1880 | type_(type), is_character_constant_(is_character_constant) |
e440a328 | 1881 | { mpz_init_set(this->val_, *val); } |
1882 | ||
1883 | static Expression* | |
1884 | do_import(Import*); | |
1885 | ||
8b1c301d | 1886 | // Write VAL to string dump. |
e440a328 | 1887 | static void |
8b1c301d | 1888 | export_integer(String_dump* exp, const mpz_t val); |
e440a328 | 1889 | |
d751bb78 | 1890 | // Write VAL to dump context. |
1891 | static void | |
1892 | dump_integer(Ast_dump_context* ast_dump_context, const mpz_t val); | |
1893 | ||
e440a328 | 1894 | protected: |
1895 | bool | |
1896 | do_is_constant() const | |
1897 | { return true; } | |
1898 | ||
0e168074 | 1899 | bool |
3ae06f68 | 1900 | do_is_static_initializer() const |
0e168074 | 1901 | { return true; } |
1902 | ||
e440a328 | 1903 | bool |
0c77715b | 1904 | do_numeric_constant_value(Numeric_constant* nc) const; |
e440a328 | 1905 | |
1906 | Type* | |
1907 | do_type(); | |
1908 | ||
1909 | void | |
1910 | do_determine_type(const Type_context* context); | |
1911 | ||
1912 | void | |
1913 | do_check_types(Gogo*); | |
1914 | ||
ea664253 | 1915 | Bexpression* |
1916 | do_get_backend(Translate_context*); | |
e440a328 | 1917 | |
1918 | Expression* | |
1919 | do_copy() | |
5d4b8566 | 1920 | { |
1921 | if (this->is_character_constant_) | |
1922 | return Expression::make_character(&this->val_, this->type_, | |
1923 | this->location()); | |
1924 | else | |
e67508fa | 1925 | return Expression::make_integer_z(&this->val_, this->type_, |
1926 | this->location()); | |
5d4b8566 | 1927 | } |
e440a328 | 1928 | |
1929 | void | |
1930 | do_export(Export*) const; | |
1931 | ||
d751bb78 | 1932 | void |
1933 | do_dump_expression(Ast_dump_context*) const; | |
1934 | ||
e440a328 | 1935 | private: |
1936 | // The integer value. | |
1937 | mpz_t val_; | |
1938 | // The type so far. | |
1939 | Type* type_; | |
5d4b8566 | 1940 | // Whether this is a character constant. |
1941 | bool is_character_constant_; | |
e440a328 | 1942 | }; |
1943 | ||
0c77715b | 1944 | // Return a numeric constant for this expression. We have to mark |
1945 | // this as a character when appropriate. | |
e440a328 | 1946 | |
1947 | bool | |
0c77715b | 1948 | Integer_expression::do_numeric_constant_value(Numeric_constant* nc) const |
e440a328 | 1949 | { |
0c77715b | 1950 | if (this->is_character_constant_) |
1951 | nc->set_rune(this->type_, this->val_); | |
1952 | else | |
1953 | nc->set_int(this->type_, this->val_); | |
e440a328 | 1954 | return true; |
1955 | } | |
1956 | ||
1957 | // Return the current type. If we haven't set the type yet, we return | |
1958 | // an abstract integer type. | |
1959 | ||
1960 | Type* | |
1961 | Integer_expression::do_type() | |
1962 | { | |
1963 | if (this->type_ == NULL) | |
5d4b8566 | 1964 | { |
1965 | if (this->is_character_constant_) | |
1966 | this->type_ = Type::make_abstract_character_type(); | |
1967 | else | |
1968 | this->type_ = Type::make_abstract_integer_type(); | |
1969 | } | |
e440a328 | 1970 | return this->type_; |
1971 | } | |
1972 | ||
1973 | // Set the type of the integer value. Here we may switch from an | |
1974 | // abstract type to a real type. | |
1975 | ||
1976 | void | |
1977 | Integer_expression::do_determine_type(const Type_context* context) | |
1978 | { | |
1979 | if (this->type_ != NULL && !this->type_->is_abstract()) | |
1980 | ; | |
0c77715b | 1981 | else if (context->type != NULL && context->type->is_numeric_type()) |
e440a328 | 1982 | this->type_ = context->type; |
1983 | else if (!context->may_be_abstract) | |
5d4b8566 | 1984 | { |
1985 | if (this->is_character_constant_) | |
1986 | this->type_ = Type::lookup_integer_type("int32"); | |
1987 | else | |
1988 | this->type_ = Type::lookup_integer_type("int"); | |
1989 | } | |
e440a328 | 1990 | } |
1991 | ||
e440a328 | 1992 | // Check the type of an integer constant. |
1993 | ||
1994 | void | |
1995 | Integer_expression::do_check_types(Gogo*) | |
1996 | { | |
0c77715b | 1997 | Type* type = this->type_; |
1998 | if (type == NULL) | |
e440a328 | 1999 | return; |
0c77715b | 2000 | Numeric_constant nc; |
2001 | if (this->is_character_constant_) | |
2002 | nc.set_rune(NULL, this->val_); | |
2003 | else | |
2004 | nc.set_int(NULL, this->val_); | |
2005 | if (!nc.set_type(type, true, this->location())) | |
e440a328 | 2006 | this->set_is_error(); |
2007 | } | |
2008 | ||
ea664253 | 2009 | // Get the backend representation for an integer constant. |
e440a328 | 2010 | |
ea664253 | 2011 | Bexpression* |
2012 | Integer_expression::do_get_backend(Translate_context* context) | |
e440a328 | 2013 | { |
12373dd5 | 2014 | if (this->is_error_expression() |
2015 | || (this->type_ != NULL && this->type_->is_error_type())) | |
2016 | { | |
2017 | go_assert(saw_errors()); | |
2018 | return context->gogo()->backend()->error_expression(); | |
2019 | } | |
2020 | ||
48c2a53a | 2021 | Type* resolved_type = NULL; |
e440a328 | 2022 | if (this->type_ != NULL && !this->type_->is_abstract()) |
48c2a53a | 2023 | resolved_type = this->type_; |
e440a328 | 2024 | else if (this->type_ != NULL && this->type_->float_type() != NULL) |
2025 | { | |
2026 | // We are converting to an abstract floating point type. | |
48c2a53a | 2027 | resolved_type = Type::lookup_float_type("float64"); |
e440a328 | 2028 | } |
2029 | else if (this->type_ != NULL && this->type_->complex_type() != NULL) | |
2030 | { | |
2031 | // We are converting to an abstract complex type. | |
48c2a53a | 2032 | resolved_type = Type::lookup_complex_type("complex128"); |
e440a328 | 2033 | } |
2034 | else | |
2035 | { | |
2036 | // If we still have an abstract type here, then this is being | |
2037 | // used in a constant expression which didn't get reduced for | |
2038 | // some reason. Use a type which will fit the value. We use <, | |
2039 | // not <=, because we need an extra bit for the sign bit. | |
2040 | int bits = mpz_sizeinbase(this->val_, 2); | |
1b1f2abf | 2041 | Type* int_type = Type::lookup_integer_type("int"); |
2042 | if (bits < int_type->integer_type()->bits()) | |
48c2a53a | 2043 | resolved_type = int_type; |
e440a328 | 2044 | else if (bits < 64) |
48c2a53a | 2045 | resolved_type = Type::lookup_integer_type("int64"); |
e440a328 | 2046 | else |
48c2a53a | 2047 | { |
2048 | if (!saw_errors()) | |
631d5788 | 2049 | go_error_at(this->location(), |
2050 | "unknown type for large integer constant"); | |
ea664253 | 2051 | return context->gogo()->backend()->error_expression(); |
48c2a53a | 2052 | } |
e440a328 | 2053 | } |
48c2a53a | 2054 | Numeric_constant nc; |
2055 | nc.set_int(resolved_type, this->val_); | |
ea664253 | 2056 | return Expression::backend_numeric_constant_expression(context, &nc); |
e440a328 | 2057 | } |
2058 | ||
2059 | // Write VAL to export data. | |
2060 | ||
2061 | void | |
8b1c301d | 2062 | Integer_expression::export_integer(String_dump* exp, const mpz_t val) |
e440a328 | 2063 | { |
2064 | char* s = mpz_get_str(NULL, 10, val); | |
2065 | exp->write_c_string(s); | |
2066 | free(s); | |
2067 | } | |
2068 | ||
2069 | // Export an integer in a constant expression. | |
2070 | ||
2071 | void | |
2072 | Integer_expression::do_export(Export* exp) const | |
2073 | { | |
2074 | Integer_expression::export_integer(exp, this->val_); | |
5d4b8566 | 2075 | if (this->is_character_constant_) |
2076 | exp->write_c_string("'"); | |
e440a328 | 2077 | // A trailing space lets us reliably identify the end of the number. |
2078 | exp->write_c_string(" "); | |
2079 | } | |
2080 | ||
2081 | // Import an integer, floating point, or complex value. This handles | |
2082 | // all these types because they all start with digits. | |
2083 | ||
2084 | Expression* | |
2085 | Integer_expression::do_import(Import* imp) | |
2086 | { | |
2087 | std::string num = imp->read_identifier(); | |
2088 | imp->require_c_string(" "); | |
2089 | if (!num.empty() && num[num.length() - 1] == 'i') | |
2090 | { | |
2091 | mpfr_t real; | |
2092 | size_t plus_pos = num.find('+', 1); | |
2093 | size_t minus_pos = num.find('-', 1); | |
2094 | size_t pos; | |
2095 | if (plus_pos == std::string::npos) | |
2096 | pos = minus_pos; | |
2097 | else if (minus_pos == std::string::npos) | |
2098 | pos = plus_pos; | |
2099 | else | |
2100 | { | |
631d5788 | 2101 | go_error_at(imp->location(), "bad number in import data: %qs", |
2102 | num.c_str()); | |
e440a328 | 2103 | return Expression::make_error(imp->location()); |
2104 | } | |
2105 | if (pos == std::string::npos) | |
2106 | mpfr_set_ui(real, 0, GMP_RNDN); | |
2107 | else | |
2108 | { | |
2109 | std::string real_str = num.substr(0, pos); | |
2110 | if (mpfr_init_set_str(real, real_str.c_str(), 10, GMP_RNDN) != 0) | |
2111 | { | |
631d5788 | 2112 | go_error_at(imp->location(), "bad number in import data: %qs", |
2113 | real_str.c_str()); | |
e440a328 | 2114 | return Expression::make_error(imp->location()); |
2115 | } | |
2116 | } | |
2117 | ||
2118 | std::string imag_str; | |
2119 | if (pos == std::string::npos) | |
2120 | imag_str = num; | |
2121 | else | |
2122 | imag_str = num.substr(pos); | |
2123 | imag_str = imag_str.substr(0, imag_str.size() - 1); | |
2124 | mpfr_t imag; | |
2125 | if (mpfr_init_set_str(imag, imag_str.c_str(), 10, GMP_RNDN) != 0) | |
2126 | { | |
631d5788 | 2127 | go_error_at(imp->location(), "bad number in import data: %qs", |
2128 | imag_str.c_str()); | |
e440a328 | 2129 | return Expression::make_error(imp->location()); |
2130 | } | |
fcbea5e4 | 2131 | mpc_t cval; |
2132 | mpc_init2(cval, mpc_precision); | |
2133 | mpc_set_fr_fr(cval, real, imag, MPC_RNDNN); | |
e440a328 | 2134 | mpfr_clear(real); |
2135 | mpfr_clear(imag); | |
fcbea5e4 | 2136 | Expression* ret = Expression::make_complex(&cval, NULL, imp->location()); |
2137 | mpc_clear(cval); | |
e440a328 | 2138 | return ret; |
2139 | } | |
2140 | else if (num.find('.') == std::string::npos | |
2141 | && num.find('E') == std::string::npos) | |
2142 | { | |
5d4b8566 | 2143 | bool is_character_constant = (!num.empty() |
2144 | && num[num.length() - 1] == '\''); | |
2145 | if (is_character_constant) | |
2146 | num = num.substr(0, num.length() - 1); | |
e440a328 | 2147 | mpz_t val; |
2148 | if (mpz_init_set_str(val, num.c_str(), 10) != 0) | |
2149 | { | |
631d5788 | 2150 | go_error_at(imp->location(), "bad number in import data: %qs", |
2151 | num.c_str()); | |
e440a328 | 2152 | return Expression::make_error(imp->location()); |
2153 | } | |
5d4b8566 | 2154 | Expression* ret; |
2155 | if (is_character_constant) | |
2156 | ret = Expression::make_character(&val, NULL, imp->location()); | |
2157 | else | |
e67508fa | 2158 | ret = Expression::make_integer_z(&val, NULL, imp->location()); |
e440a328 | 2159 | mpz_clear(val); |
2160 | return ret; | |
2161 | } | |
2162 | else | |
2163 | { | |
2164 | mpfr_t val; | |
2165 | if (mpfr_init_set_str(val, num.c_str(), 10, GMP_RNDN) != 0) | |
2166 | { | |
631d5788 | 2167 | go_error_at(imp->location(), "bad number in import data: %qs", |
2168 | num.c_str()); | |
e440a328 | 2169 | return Expression::make_error(imp->location()); |
2170 | } | |
2171 | Expression* ret = Expression::make_float(&val, NULL, imp->location()); | |
2172 | mpfr_clear(val); | |
2173 | return ret; | |
2174 | } | |
2175 | } | |
d751bb78 | 2176 | // Ast dump for integer expression. |
2177 | ||
2178 | void | |
2179 | Integer_expression::do_dump_expression(Ast_dump_context* ast_dump_context) const | |
2180 | { | |
5d4b8566 | 2181 | if (this->is_character_constant_) |
2182 | ast_dump_context->ostream() << '\''; | |
8b1c301d | 2183 | Integer_expression::export_integer(ast_dump_context, this->val_); |
5d4b8566 | 2184 | if (this->is_character_constant_) |
2185 | ast_dump_context->ostream() << '\''; | |
d751bb78 | 2186 | } |
2187 | ||
e67508fa | 2188 | // Build a new integer value from a multi-precision integer. |
e440a328 | 2189 | |
2190 | Expression* | |
e67508fa | 2191 | Expression::make_integer_z(const mpz_t* val, Type* type, Location location) |
5d4b8566 | 2192 | { |
2193 | return new Integer_expression(val, type, false, location); | |
2194 | } | |
2195 | ||
e67508fa | 2196 | // Build a new integer value from an unsigned long. |
2197 | ||
2198 | Expression* | |
2199 | Expression::make_integer_ul(unsigned long val, Type *type, Location location) | |
2200 | { | |
2201 | mpz_t zval; | |
2202 | mpz_init_set_ui(zval, val); | |
2203 | Expression* ret = Expression::make_integer_z(&zval, type, location); | |
2204 | mpz_clear(zval); | |
2205 | return ret; | |
2206 | } | |
2207 | ||
2208 | // Build a new integer value from a signed long. | |
2209 | ||
2210 | Expression* | |
2211 | Expression::make_integer_sl(long val, Type *type, Location location) | |
2212 | { | |
2213 | mpz_t zval; | |
2214 | mpz_init_set_si(zval, val); | |
2215 | Expression* ret = Expression::make_integer_z(&zval, type, location); | |
2216 | mpz_clear(zval); | |
2217 | return ret; | |
2218 | } | |
2219 | ||
3f378015 | 2220 | // Store an int64_t in an uninitialized mpz_t. |
2221 | ||
2222 | static void | |
2223 | set_mpz_from_int64(mpz_t* zval, int64_t val) | |
2224 | { | |
2225 | if (val >= 0) | |
2226 | { | |
2227 | unsigned long ul = static_cast<unsigned long>(val); | |
2228 | if (static_cast<int64_t>(ul) == val) | |
2229 | { | |
2230 | mpz_init_set_ui(*zval, ul); | |
2231 | return; | |
2232 | } | |
2233 | } | |
2234 | uint64_t uv; | |
2235 | if (val >= 0) | |
2236 | uv = static_cast<uint64_t>(val); | |
2237 | else | |
2238 | uv = static_cast<uint64_t>(- val); | |
2239 | unsigned long ul = uv & 0xffffffffUL; | |
2240 | mpz_init_set_ui(*zval, ul); | |
2241 | mpz_t hval; | |
2242 | mpz_init_set_ui(hval, static_cast<unsigned long>(uv >> 32)); | |
2243 | mpz_mul_2exp(hval, hval, 32); | |
2244 | mpz_add(*zval, *zval, hval); | |
2245 | mpz_clear(hval); | |
2246 | if (val < 0) | |
2247 | mpz_neg(*zval, *zval); | |
2248 | } | |
2249 | ||
2250 | // Build a new integer value from an int64_t. | |
2251 | ||
2252 | Expression* | |
2253 | Expression::make_integer_int64(int64_t val, Type* type, Location location) | |
2254 | { | |
2255 | mpz_t zval; | |
2256 | set_mpz_from_int64(&zval, val); | |
2257 | Expression* ret = Expression::make_integer_z(&zval, type, location); | |
2258 | mpz_clear(zval); | |
2259 | return ret; | |
2260 | } | |
2261 | ||
5d4b8566 | 2262 | // Build a new character constant value. |
2263 | ||
2264 | Expression* | |
2265 | Expression::make_character(const mpz_t* val, Type* type, Location location) | |
e440a328 | 2266 | { |
5d4b8566 | 2267 | return new Integer_expression(val, type, true, location); |
e440a328 | 2268 | } |
2269 | ||
2270 | // Floats. | |
2271 | ||
2272 | class Float_expression : public Expression | |
2273 | { | |
2274 | public: | |
b13c66cd | 2275 | Float_expression(const mpfr_t* val, Type* type, Location location) |
e440a328 | 2276 | : Expression(EXPRESSION_FLOAT, location), |
2277 | type_(type) | |
2278 | { | |
2279 | mpfr_init_set(this->val_, *val, GMP_RNDN); | |
2280 | } | |
2281 | ||
e440a328 | 2282 | // Write VAL to export data. |
2283 | static void | |
8b1c301d | 2284 | export_float(String_dump* exp, const mpfr_t val); |
2285 | ||
d751bb78 | 2286 | // Write VAL to dump file. |
2287 | static void | |
2288 | dump_float(Ast_dump_context* ast_dump_context, const mpfr_t val); | |
e440a328 | 2289 | |
2290 | protected: | |
2291 | bool | |
2292 | do_is_constant() const | |
2293 | { return true; } | |
2294 | ||
0e168074 | 2295 | bool |
3ae06f68 | 2296 | do_is_static_initializer() const |
0e168074 | 2297 | { return true; } |
2298 | ||
e440a328 | 2299 | bool |
0c77715b | 2300 | do_numeric_constant_value(Numeric_constant* nc) const |
2301 | { | |
2302 | nc->set_float(this->type_, this->val_); | |
2303 | return true; | |
2304 | } | |
e440a328 | 2305 | |
2306 | Type* | |
2307 | do_type(); | |
2308 | ||
2309 | void | |
2310 | do_determine_type(const Type_context*); | |
2311 | ||
2312 | void | |
2313 | do_check_types(Gogo*); | |
2314 | ||
2315 | Expression* | |
2316 | do_copy() | |
2317 | { return Expression::make_float(&this->val_, this->type_, | |
2318 | this->location()); } | |
2319 | ||
ea664253 | 2320 | Bexpression* |
2321 | do_get_backend(Translate_context*); | |
e440a328 | 2322 | |
2323 | void | |
2324 | do_export(Export*) const; | |
2325 | ||
d751bb78 | 2326 | void |
2327 | do_dump_expression(Ast_dump_context*) const; | |
2328 | ||
e440a328 | 2329 | private: |
2330 | // The floating point value. | |
2331 | mpfr_t val_; | |
2332 | // The type so far. | |
2333 | Type* type_; | |
2334 | }; | |
2335 | ||
e440a328 | 2336 | // Return the current type. If we haven't set the type yet, we return |
2337 | // an abstract float type. | |
2338 | ||
2339 | Type* | |
2340 | Float_expression::do_type() | |
2341 | { | |
2342 | if (this->type_ == NULL) | |
2343 | this->type_ = Type::make_abstract_float_type(); | |
2344 | return this->type_; | |
2345 | } | |
2346 | ||
2347 | // Set the type of the float value. Here we may switch from an | |
2348 | // abstract type to a real type. | |
2349 | ||
2350 | void | |
2351 | Float_expression::do_determine_type(const Type_context* context) | |
2352 | { | |
2353 | if (this->type_ != NULL && !this->type_->is_abstract()) | |
2354 | ; | |
2355 | else if (context->type != NULL | |
2356 | && (context->type->integer_type() != NULL | |
2357 | || context->type->float_type() != NULL | |
2358 | || context->type->complex_type() != NULL)) | |
2359 | this->type_ = context->type; | |
2360 | else if (!context->may_be_abstract) | |
48080209 | 2361 | this->type_ = Type::lookup_float_type("float64"); |
e440a328 | 2362 | } |
2363 | ||
e440a328 | 2364 | // Check the type of a float value. |
2365 | ||
2366 | void | |
2367 | Float_expression::do_check_types(Gogo*) | |
2368 | { | |
0c77715b | 2369 | Type* type = this->type_; |
2370 | if (type == NULL) | |
e440a328 | 2371 | return; |
0c77715b | 2372 | Numeric_constant nc; |
2373 | nc.set_float(NULL, this->val_); | |
2374 | if (!nc.set_type(this->type_, true, this->location())) | |
e440a328 | 2375 | this->set_is_error(); |
e440a328 | 2376 | } |
2377 | ||
ea664253 | 2378 | // Get the backend representation for a float constant. |
e440a328 | 2379 | |
ea664253 | 2380 | Bexpression* |
2381 | Float_expression::do_get_backend(Translate_context* context) | |
e440a328 | 2382 | { |
12373dd5 | 2383 | if (this->is_error_expression() |
2384 | || (this->type_ != NULL && this->type_->is_error_type())) | |
2385 | { | |
2386 | go_assert(saw_errors()); | |
2387 | return context->gogo()->backend()->error_expression(); | |
2388 | } | |
2389 | ||
48c2a53a | 2390 | Type* resolved_type; |
e440a328 | 2391 | if (this->type_ != NULL && !this->type_->is_abstract()) |
48c2a53a | 2392 | resolved_type = this->type_; |
e440a328 | 2393 | else if (this->type_ != NULL && this->type_->integer_type() != NULL) |
2394 | { | |
2395 | // We have an abstract integer type. We just hope for the best. | |
48c2a53a | 2396 | resolved_type = Type::lookup_integer_type("int"); |
2397 | } | |
2398 | else if (this->type_ != NULL && this->type_->complex_type() != NULL) | |
2399 | { | |
2400 | // We are converting to an abstract complex type. | |
2401 | resolved_type = Type::lookup_complex_type("complex128"); | |
e440a328 | 2402 | } |
2403 | else | |
2404 | { | |
2405 | // If we still have an abstract type here, then this is being | |
2406 | // used in a constant expression which didn't get reduced. We | |
2407 | // just use float64 and hope for the best. | |
48c2a53a | 2408 | resolved_type = Type::lookup_float_type("float64"); |
e440a328 | 2409 | } |
48c2a53a | 2410 | |
2411 | Numeric_constant nc; | |
2412 | nc.set_float(resolved_type, this->val_); | |
ea664253 | 2413 | return Expression::backend_numeric_constant_expression(context, &nc); |
e440a328 | 2414 | } |
2415 | ||
8b1c301d | 2416 | // Write a floating point number to a string dump. |
e440a328 | 2417 | |
2418 | void | |
8b1c301d | 2419 | Float_expression::export_float(String_dump *exp, const mpfr_t val) |
e440a328 | 2420 | { |
2421 | mp_exp_t exponent; | |
2422 | char* s = mpfr_get_str(NULL, &exponent, 10, 0, val, GMP_RNDN); | |
2423 | if (*s == '-') | |
2424 | exp->write_c_string("-"); | |
2425 | exp->write_c_string("0."); | |
2426 | exp->write_c_string(*s == '-' ? s + 1 : s); | |
2427 | mpfr_free_str(s); | |
2428 | char buf[30]; | |
2429 | snprintf(buf, sizeof buf, "E%ld", exponent); | |
2430 | exp->write_c_string(buf); | |
2431 | } | |
2432 | ||
2433 | // Export a floating point number in a constant expression. | |
2434 | ||
2435 | void | |
2436 | Float_expression::do_export(Export* exp) const | |
2437 | { | |
2438 | Float_expression::export_float(exp, this->val_); | |
2439 | // A trailing space lets us reliably identify the end of the number. | |
2440 | exp->write_c_string(" "); | |
2441 | } | |
2442 | ||
d751bb78 | 2443 | // Dump a floating point number to the dump file. |
2444 | ||
2445 | void | |
2446 | Float_expression::do_dump_expression(Ast_dump_context* ast_dump_context) const | |
2447 | { | |
8b1c301d | 2448 | Float_expression::export_float(ast_dump_context, this->val_); |
d751bb78 | 2449 | } |
2450 | ||
e440a328 | 2451 | // Make a float expression. |
2452 | ||
2453 | Expression* | |
b13c66cd | 2454 | Expression::make_float(const mpfr_t* val, Type* type, Location location) |
e440a328 | 2455 | { |
2456 | return new Float_expression(val, type, location); | |
2457 | } | |
2458 | ||
2459 | // Complex numbers. | |
2460 | ||
2461 | class Complex_expression : public Expression | |
2462 | { | |
2463 | public: | |
fcbea5e4 | 2464 | Complex_expression(const mpc_t* val, Type* type, Location location) |
e440a328 | 2465 | : Expression(EXPRESSION_COMPLEX, location), |
2466 | type_(type) | |
2467 | { | |
fcbea5e4 | 2468 | mpc_init2(this->val_, mpc_precision); |
2469 | mpc_set(this->val_, *val, MPC_RNDNN); | |
e440a328 | 2470 | } |
2471 | ||
fcbea5e4 | 2472 | // Write VAL to string dump. |
e440a328 | 2473 | static void |
fcbea5e4 | 2474 | export_complex(String_dump* exp, const mpc_t val); |
e440a328 | 2475 | |
d751bb78 | 2476 | // Write REAL/IMAG to dump context. |
2477 | static void | |
fcbea5e4 | 2478 | dump_complex(Ast_dump_context* ast_dump_context, const mpc_t val); |
d751bb78 | 2479 | |
e440a328 | 2480 | protected: |
2481 | bool | |
2482 | do_is_constant() const | |
2483 | { return true; } | |
2484 | ||
0e168074 | 2485 | bool |
3ae06f68 | 2486 | do_is_static_initializer() const |
0e168074 | 2487 | { return true; } |
2488 | ||
e440a328 | 2489 | bool |
0c77715b | 2490 | do_numeric_constant_value(Numeric_constant* nc) const |
2491 | { | |
fcbea5e4 | 2492 | nc->set_complex(this->type_, this->val_); |
0c77715b | 2493 | return true; |
2494 | } | |
e440a328 | 2495 | |
2496 | Type* | |
2497 | do_type(); | |
2498 | ||
2499 | void | |
2500 | do_determine_type(const Type_context*); | |
2501 | ||
2502 | void | |
2503 | do_check_types(Gogo*); | |
2504 | ||
2505 | Expression* | |
2506 | do_copy() | |
2507 | { | |
fcbea5e4 | 2508 | return Expression::make_complex(&this->val_, this->type_, |
e440a328 | 2509 | this->location()); |
2510 | } | |
2511 | ||
ea664253 | 2512 | Bexpression* |
2513 | do_get_backend(Translate_context*); | |
e440a328 | 2514 | |
2515 | void | |
2516 | do_export(Export*) const; | |
2517 | ||
d751bb78 | 2518 | void |
2519 | do_dump_expression(Ast_dump_context*) const; | |
abd26de0 | 2520 | |
e440a328 | 2521 | private: |
fcbea5e4 | 2522 | // The complex value. |
2523 | mpc_t val_; | |
e440a328 | 2524 | // The type if known. |
2525 | Type* type_; | |
2526 | }; | |
2527 | ||
e440a328 | 2528 | // Return the current type. If we haven't set the type yet, we return |
2529 | // an abstract complex type. | |
2530 | ||
2531 | Type* | |
2532 | Complex_expression::do_type() | |
2533 | { | |
2534 | if (this->type_ == NULL) | |
2535 | this->type_ = Type::make_abstract_complex_type(); | |
2536 | return this->type_; | |
2537 | } | |
2538 | ||
2539 | // Set the type of the complex value. Here we may switch from an | |
2540 | // abstract type to a real type. | |
2541 | ||
2542 | void | |
2543 | Complex_expression::do_determine_type(const Type_context* context) | |
2544 | { | |
2545 | if (this->type_ != NULL && !this->type_->is_abstract()) | |
2546 | ; | |
abd26de0 | 2547 | else if (context->type != NULL && context->type->is_numeric_type()) |
e440a328 | 2548 | this->type_ = context->type; |
2549 | else if (!context->may_be_abstract) | |
48080209 | 2550 | this->type_ = Type::lookup_complex_type("complex128"); |
e440a328 | 2551 | } |
2552 | ||
e440a328 | 2553 | // Check the type of a complex value. |
2554 | ||
2555 | void | |
2556 | Complex_expression::do_check_types(Gogo*) | |
2557 | { | |
0c77715b | 2558 | Type* type = this->type_; |
2559 | if (type == NULL) | |
e440a328 | 2560 | return; |
0c77715b | 2561 | Numeric_constant nc; |
fcbea5e4 | 2562 | nc.set_complex(NULL, this->val_); |
0c77715b | 2563 | if (!nc.set_type(this->type_, true, this->location())) |
e440a328 | 2564 | this->set_is_error(); |
2565 | } | |
2566 | ||
ea664253 | 2567 | // Get the backend representation for a complex constant. |
e440a328 | 2568 | |
ea664253 | 2569 | Bexpression* |
2570 | Complex_expression::do_get_backend(Translate_context* context) | |
e440a328 | 2571 | { |
12373dd5 | 2572 | if (this->is_error_expression() |
2573 | || (this->type_ != NULL && this->type_->is_error_type())) | |
2574 | { | |
2575 | go_assert(saw_errors()); | |
2576 | return context->gogo()->backend()->error_expression(); | |
2577 | } | |
2578 | ||
48c2a53a | 2579 | Type* resolved_type; |
e440a328 | 2580 | if (this->type_ != NULL && !this->type_->is_abstract()) |
48c2a53a | 2581 | resolved_type = this->type_; |
2582 | else if (this->type_ != NULL && this->type_->integer_type() != NULL) | |
2583 | { | |
2584 | // We are converting to an abstract integer type. | |
2585 | resolved_type = Type::lookup_integer_type("int"); | |
2586 | } | |
2587 | else if (this->type_ != NULL && this->type_->float_type() != NULL) | |
2588 | { | |
2589 | // We are converting to an abstract float type. | |
2590 | resolved_type = Type::lookup_float_type("float64"); | |
2591 | } | |
e440a328 | 2592 | else |
2593 | { | |
47ae02b7 | 2594 | // If we still have an abstract type here, this is being |
e440a328 | 2595 | // used in a constant expression which didn't get reduced. We |
2596 | // just use complex128 and hope for the best. | |
48c2a53a | 2597 | resolved_type = Type::lookup_complex_type("complex128"); |
e440a328 | 2598 | } |
48c2a53a | 2599 | |
2600 | Numeric_constant nc; | |
fcbea5e4 | 2601 | nc.set_complex(resolved_type, this->val_); |
ea664253 | 2602 | return Expression::backend_numeric_constant_expression(context, &nc); |
e440a328 | 2603 | } |
2604 | ||
2605 | // Write REAL/IMAG to export data. | |
2606 | ||
2607 | void | |
fcbea5e4 | 2608 | Complex_expression::export_complex(String_dump* exp, const mpc_t val) |
e440a328 | 2609 | { |
fcbea5e4 | 2610 | if (!mpfr_zero_p(mpc_realref(val))) |
e440a328 | 2611 | { |
fcbea5e4 | 2612 | Float_expression::export_float(exp, mpc_realref(val)); |
d1db782d | 2613 | if (mpfr_sgn(mpc_imagref(val)) >= 0) |
e440a328 | 2614 | exp->write_c_string("+"); |
2615 | } | |
fcbea5e4 | 2616 | Float_expression::export_float(exp, mpc_imagref(val)); |
e440a328 | 2617 | exp->write_c_string("i"); |
2618 | } | |
2619 | ||
2620 | // Export a complex number in a constant expression. | |
2621 | ||
2622 | void | |
2623 | Complex_expression::do_export(Export* exp) const | |
2624 | { | |
fcbea5e4 | 2625 | Complex_expression::export_complex(exp, this->val_); |
e440a328 | 2626 | // A trailing space lets us reliably identify the end of the number. |
2627 | exp->write_c_string(" "); | |
2628 | } | |
2629 | ||
d751bb78 | 2630 | // Dump a complex expression to the dump file. |
2631 | ||
2632 | void | |
2633 | Complex_expression::do_dump_expression(Ast_dump_context* ast_dump_context) const | |
2634 | { | |
fcbea5e4 | 2635 | Complex_expression::export_complex(ast_dump_context, this->val_); |
d751bb78 | 2636 | } |
2637 | ||
e440a328 | 2638 | // Make a complex expression. |
2639 | ||
2640 | Expression* | |
fcbea5e4 | 2641 | Expression::make_complex(const mpc_t* val, Type* type, Location location) |
e440a328 | 2642 | { |
fcbea5e4 | 2643 | return new Complex_expression(val, type, location); |
e440a328 | 2644 | } |
2645 | ||
d5b605df | 2646 | // Find a named object in an expression. |
2647 | ||
2648 | class Find_named_object : public Traverse | |
2649 | { | |
2650 | public: | |
2651 | Find_named_object(Named_object* no) | |
2652 | : Traverse(traverse_expressions), | |
2653 | no_(no), found_(false) | |
2654 | { } | |
2655 | ||
2656 | // Whether we found the object. | |
2657 | bool | |
2658 | found() const | |
2659 | { return this->found_; } | |
2660 | ||
2661 | protected: | |
2662 | int | |
2663 | expression(Expression**); | |
2664 | ||
2665 | private: | |
2666 | // The object we are looking for. | |
2667 | Named_object* no_; | |
2668 | // Whether we found it. | |
2669 | bool found_; | |
2670 | }; | |
2671 | ||
e440a328 | 2672 | // A reference to a const in an expression. |
2673 | ||
2674 | class Const_expression : public Expression | |
2675 | { | |
2676 | public: | |
b13c66cd | 2677 | Const_expression(Named_object* constant, Location location) |
e440a328 | 2678 | : Expression(EXPRESSION_CONST_REFERENCE, location), |
13e818f5 | 2679 | constant_(constant), type_(NULL), seen_(false) |
e440a328 | 2680 | { } |
2681 | ||
d5b605df | 2682 | Named_object* |
2683 | named_object() | |
2684 | { return this->constant_; } | |
2685 | ||
a7f064d5 | 2686 | // Check that the initializer does not refer to the constant itself. |
2687 | void | |
2688 | check_for_init_loop(); | |
2689 | ||
e440a328 | 2690 | protected: |
ba4aedd4 | 2691 | int |
2692 | do_traverse(Traverse*); | |
2693 | ||
e440a328 | 2694 | Expression* |
ceeb4318 | 2695 | do_lower(Gogo*, Named_object*, Statement_inserter*, int); |
e440a328 | 2696 | |
2697 | bool | |
2698 | do_is_constant() const | |
2699 | { return true; } | |
2700 | ||
0e168074 | 2701 | bool |
3ae06f68 | 2702 | do_is_static_initializer() const |
0e168074 | 2703 | { return true; } |
2704 | ||
e440a328 | 2705 | bool |
0c77715b | 2706 | do_numeric_constant_value(Numeric_constant* nc) const; |
e440a328 | 2707 | |
2708 | bool | |
af6b489a | 2709 | do_string_constant_value(std::string* val) const; |
e440a328 | 2710 | |
2711 | Type* | |
2712 | do_type(); | |
2713 | ||
2714 | // The type of a const is set by the declaration, not the use. | |
2715 | void | |
2716 | do_determine_type(const Type_context*); | |
2717 | ||
2718 | void | |
2719 | do_check_types(Gogo*); | |
2720 | ||
2721 | Expression* | |
2722 | do_copy() | |
2723 | { return this; } | |
2724 | ||
ea664253 | 2725 | Bexpression* |
2726 | do_get_backend(Translate_context* context); | |
e440a328 | 2727 | |
2728 | // When exporting a reference to a const as part of a const | |
2729 | // expression, we export the value. We ignore the fact that it has | |
2730 | // a name. | |
2731 | void | |
2732 | do_export(Export* exp) const | |
2733 | { this->constant_->const_value()->expr()->export_expression(exp); } | |
2734 | ||
d751bb78 | 2735 | void |
2736 | do_dump_expression(Ast_dump_context*) const; | |
2737 | ||
e440a328 | 2738 | private: |
2739 | // The constant. | |
2740 | Named_object* constant_; | |
2741 | // The type of this reference. This is used if the constant has an | |
2742 | // abstract type. | |
2743 | Type* type_; | |
13e818f5 | 2744 | // Used to prevent infinite recursion when a constant incorrectly |
2745 | // refers to itself. | |
2746 | mutable bool seen_; | |
e440a328 | 2747 | }; |
2748 | ||
ba4aedd4 | 2749 | // Traversal. |
2750 | ||
2751 | int | |
2752 | Const_expression::do_traverse(Traverse* traverse) | |
2753 | { | |
2754 | if (this->type_ != NULL) | |
2755 | return Type::traverse(this->type_, traverse); | |
2756 | return TRAVERSE_CONTINUE; | |
2757 | } | |
2758 | ||
e440a328 | 2759 | // Lower a constant expression. This is where we convert the |
2760 | // predeclared constant iota into an integer value. | |
2761 | ||
2762 | Expression* | |
ceeb4318 | 2763 | Const_expression::do_lower(Gogo* gogo, Named_object*, |
2764 | Statement_inserter*, int iota_value) | |
e440a328 | 2765 | { |
2766 | if (this->constant_->const_value()->expr()->classification() | |
2767 | == EXPRESSION_IOTA) | |
2768 | { | |
2769 | if (iota_value == -1) | |
2770 | { | |
631d5788 | 2771 | go_error_at(this->location(), |
2772 | "iota is only defined in const declarations"); | |
e440a328 | 2773 | iota_value = 0; |
2774 | } | |
e67508fa | 2775 | return Expression::make_integer_ul(iota_value, NULL, this->location()); |
e440a328 | 2776 | } |
2777 | ||
2778 | // Make sure that the constant itself has been lowered. | |
2779 | gogo->lower_constant(this->constant_); | |
2780 | ||
2781 | return this; | |
2782 | } | |
2783 | ||
0c77715b | 2784 | // Return a numeric constant value. |
e440a328 | 2785 | |
2786 | bool | |
0c77715b | 2787 | Const_expression::do_numeric_constant_value(Numeric_constant* nc) const |
e440a328 | 2788 | { |
13e818f5 | 2789 | if (this->seen_) |
2790 | return false; | |
2791 | ||
e440a328 | 2792 | Expression* e = this->constant_->const_value()->expr(); |
0c77715b | 2793 | |
13e818f5 | 2794 | this->seen_ = true; |
2795 | ||
0c77715b | 2796 | bool r = e->numeric_constant_value(nc); |
e440a328 | 2797 | |
13e818f5 | 2798 | this->seen_ = false; |
2799 | ||
e440a328 | 2800 | Type* ctype; |
2801 | if (this->type_ != NULL) | |
2802 | ctype = this->type_; | |
2803 | else | |
2804 | ctype = this->constant_->const_value()->type(); | |
e440a328 | 2805 | if (r && ctype != NULL) |
2806 | { | |
0c77715b | 2807 | if (!nc->set_type(ctype, false, this->location())) |
e440a328 | 2808 | return false; |
e440a328 | 2809 | } |
e440a328 | 2810 | |
e440a328 | 2811 | return r; |
2812 | } | |
2813 | ||
af6b489a | 2814 | bool |
2815 | Const_expression::do_string_constant_value(std::string* val) const | |
2816 | { | |
2817 | if (this->seen_) | |
2818 | return false; | |
2819 | ||
2820 | Expression* e = this->constant_->const_value()->expr(); | |
2821 | ||
2822 | this->seen_ = true; | |
2823 | bool ok = e->string_constant_value(val); | |
2824 | this->seen_ = false; | |
2825 | ||
2826 | return ok; | |
2827 | } | |
2828 | ||
e440a328 | 2829 | // Return the type of the const reference. |
2830 | ||
2831 | Type* | |
2832 | Const_expression::do_type() | |
2833 | { | |
2834 | if (this->type_ != NULL) | |
2835 | return this->type_; | |
13e818f5 | 2836 | |
2f78f012 | 2837 | Named_constant* nc = this->constant_->const_value(); |
2838 | ||
2839 | if (this->seen_ || nc->lowering()) | |
13e818f5 | 2840 | { |
2841 | this->report_error(_("constant refers to itself")); | |
2842 | this->type_ = Type::make_error_type(); | |
2843 | return this->type_; | |
2844 | } | |
2845 | ||
2846 | this->seen_ = true; | |
2847 | ||
e440a328 | 2848 | Type* ret = nc->type(); |
13e818f5 | 2849 | |
e440a328 | 2850 | if (ret != NULL) |
13e818f5 | 2851 | { |
2852 | this->seen_ = false; | |
2853 | return ret; | |
2854 | } | |
2855 | ||
e440a328 | 2856 | // During parsing, a named constant may have a NULL type, but we |
2857 | // must not return a NULL type here. | |
13e818f5 | 2858 | ret = nc->expr()->type(); |
2859 | ||
2860 | this->seen_ = false; | |
2861 | ||
2862 | return ret; | |
e440a328 | 2863 | } |
2864 | ||
2865 | // Set the type of the const reference. | |
2866 | ||
2867 | void | |
2868 | Const_expression::do_determine_type(const Type_context* context) | |
2869 | { | |
2870 | Type* ctype = this->constant_->const_value()->type(); | |
2871 | Type* cetype = (ctype != NULL | |
2872 | ? ctype | |
2873 | : this->constant_->const_value()->expr()->type()); | |
2874 | if (ctype != NULL && !ctype->is_abstract()) | |
2875 | ; | |
2876 | else if (context->type != NULL | |
0c77715b | 2877 | && context->type->is_numeric_type() |
2878 | && cetype->is_numeric_type()) | |
e440a328 | 2879 | this->type_ = context->type; |
2880 | else if (context->type != NULL | |
2881 | && context->type->is_string_type() | |
2882 | && cetype->is_string_type()) | |
2883 | this->type_ = context->type; | |
2884 | else if (context->type != NULL | |
2885 | && context->type->is_boolean_type() | |
2886 | && cetype->is_boolean_type()) | |
2887 | this->type_ = context->type; | |
2888 | else if (!context->may_be_abstract) | |
2889 | { | |
2890 | if (cetype->is_abstract()) | |
2891 | cetype = cetype->make_non_abstract_type(); | |
2892 | this->type_ = cetype; | |
2893 | } | |
2894 | } | |
2895 | ||
a7f064d5 | 2896 | // Check for a loop in which the initializer of a constant refers to |
2897 | // the constant itself. | |
e440a328 | 2898 | |
2899 | void | |
a7f064d5 | 2900 | Const_expression::check_for_init_loop() |
e440a328 | 2901 | { |
5c13bd80 | 2902 | if (this->type_ != NULL && this->type_->is_error()) |
d5b605df | 2903 | return; |
2904 | ||
a7f064d5 | 2905 | if (this->seen_) |
2906 | { | |
2907 | this->report_error(_("constant refers to itself")); | |
2908 | this->type_ = Type::make_error_type(); | |
2909 | return; | |
2910 | } | |
2911 | ||
d5b605df | 2912 | Expression* init = this->constant_->const_value()->expr(); |
2913 | Find_named_object find_named_object(this->constant_); | |
a7f064d5 | 2914 | |
2915 | this->seen_ = true; | |
d5b605df | 2916 | Expression::traverse(&init, &find_named_object); |
a7f064d5 | 2917 | this->seen_ = false; |
2918 | ||
d5b605df | 2919 | if (find_named_object.found()) |
2920 | { | |
5c13bd80 | 2921 | if (this->type_ == NULL || !this->type_->is_error()) |
a7f064d5 | 2922 | { |
2923 | this->report_error(_("constant refers to itself")); | |
2924 | this->type_ = Type::make_error_type(); | |
2925 | } | |
d5b605df | 2926 | return; |
2927 | } | |
a7f064d5 | 2928 | } |
2929 | ||
2930 | // Check types of a const reference. | |
2931 | ||
2932 | void | |
2933 | Const_expression::do_check_types(Gogo*) | |
2934 | { | |
5c13bd80 | 2935 | if (this->type_ != NULL && this->type_->is_error()) |
a7f064d5 | 2936 | return; |
2937 | ||
2938 | this->check_for_init_loop(); | |
d5b605df | 2939 | |
0c77715b | 2940 | // Check that numeric constant fits in type. |
2941 | if (this->type_ != NULL && this->type_->is_numeric_type()) | |
e440a328 | 2942 | { |
0c77715b | 2943 | Numeric_constant nc; |
2944 | if (this->constant_->const_value()->expr()->numeric_constant_value(&nc)) | |
e440a328 | 2945 | { |
0c77715b | 2946 | if (!nc.set_type(this->type_, true, this->location())) |
2947 | this->set_is_error(); | |
e440a328 | 2948 | } |
e440a328 | 2949 | } |
2950 | } | |
2951 | ||
ea664253 | 2952 | // Return the backend representation for a const reference. |
e440a328 | 2953 | |
ea664253 | 2954 | Bexpression* |
2955 | Const_expression::do_get_backend(Translate_context* context) | |
e440a328 | 2956 | { |
12373dd5 | 2957 | if (this->is_error_expression() |
2958 | || (this->type_ != NULL && this->type_->is_error())) | |
2959 | { | |
2960 | go_assert(saw_errors()); | |
2961 | return context->backend()->error_expression(); | |
2962 | } | |
e440a328 | 2963 | |
2964 | // If the type has been set for this expression, but the underlying | |
2965 | // object is an abstract int or float, we try to get the abstract | |
2966 | // value. Otherwise we may lose something in the conversion. | |
f2de4532 | 2967 | Expression* expr = this->constant_->const_value()->expr(); |
e440a328 | 2968 | if (this->type_ != NULL |
0c77715b | 2969 | && this->type_->is_numeric_type() |
a68492b4 | 2970 | && (this->constant_->const_value()->type() == NULL |
2971 | || this->constant_->const_value()->type()->is_abstract())) | |
e440a328 | 2972 | { |
0c77715b | 2973 | Numeric_constant nc; |
2974 | if (expr->numeric_constant_value(&nc) | |
2975 | && nc.set_type(this->type_, false, this->location())) | |
e440a328 | 2976 | { |
0c77715b | 2977 | Expression* e = nc.expression(this->location()); |
ea664253 | 2978 | return e->get_backend(context); |
e440a328 | 2979 | } |
e440a328 | 2980 | } |
2981 | ||
2c809f8f | 2982 | if (this->type_ != NULL) |
f2de4532 | 2983 | expr = Expression::make_cast(this->type_, expr, this->location()); |
ea664253 | 2984 | return expr->get_backend(context); |
e440a328 | 2985 | } |
2986 | ||
d751bb78 | 2987 | // Dump ast representation for constant expression. |
2988 | ||
2989 | void | |
2990 | Const_expression::do_dump_expression(Ast_dump_context* ast_dump_context) const | |
2991 | { | |
2992 | ast_dump_context->ostream() << this->constant_->name(); | |
2993 | } | |
2994 | ||
e440a328 | 2995 | // Make a reference to a constant in an expression. |
2996 | ||
2997 | Expression* | |
2998 | Expression::make_const_reference(Named_object* constant, | |
b13c66cd | 2999 | Location location) |
e440a328 | 3000 | { |
3001 | return new Const_expression(constant, location); | |
3002 | } | |
3003 | ||
d5b605df | 3004 | // Find a named object in an expression. |
3005 | ||
3006 | int | |
3007 | Find_named_object::expression(Expression** pexpr) | |
3008 | { | |
3009 | switch ((*pexpr)->classification()) | |
3010 | { | |
3011 | case Expression::EXPRESSION_CONST_REFERENCE: | |
a7f064d5 | 3012 | { |
3013 | Const_expression* ce = static_cast<Const_expression*>(*pexpr); | |
3014 | if (ce->named_object() == this->no_) | |
3015 | break; | |
3016 | ||
3017 | // We need to check a constant initializer explicitly, as | |
3018 | // loops here will not be caught by the loop checking for | |
3019 | // variable initializers. | |
3020 | ce->check_for_init_loop(); | |
3021 | ||
3022 | return TRAVERSE_CONTINUE; | |
3023 | } | |
3024 | ||
d5b605df | 3025 | case Expression::EXPRESSION_VAR_REFERENCE: |
3026 | if ((*pexpr)->var_expression()->named_object() == this->no_) | |
3027 | break; | |
3028 | return TRAVERSE_CONTINUE; | |
3029 | case Expression::EXPRESSION_FUNC_REFERENCE: | |
3030 | if ((*pexpr)->func_expression()->named_object() == this->no_) | |
3031 | break; | |
3032 | return TRAVERSE_CONTINUE; | |
3033 | default: | |
3034 | return TRAVERSE_CONTINUE; | |
3035 | } | |
3036 | this->found_ = true; | |
3037 | return TRAVERSE_EXIT; | |
3038 | } | |
3039 | ||
e440a328 | 3040 | // The nil value. |
3041 | ||
3042 | class Nil_expression : public Expression | |
3043 | { | |
3044 | public: | |
b13c66cd | 3045 | Nil_expression(Location location) |
e440a328 | 3046 | : Expression(EXPRESSION_NIL, location) |
3047 | { } | |
3048 | ||
3049 | static Expression* | |
3050 | do_import(Import*); | |
3051 | ||
3052 | protected: | |
3053 | bool | |
3054 | do_is_constant() const | |
3055 | { return true; } | |
3056 | ||
f9ca30f9 | 3057 | bool |
3ae06f68 | 3058 | do_is_static_initializer() const |
f9ca30f9 | 3059 | { return true; } |
3060 | ||
e440a328 | 3061 | Type* |
3062 | do_type() | |
3063 | { return Type::make_nil_type(); } | |
3064 | ||
3065 | void | |
3066 | do_determine_type(const Type_context*) | |
3067 | { } | |
3068 | ||
3069 | Expression* | |
3070 | do_copy() | |
3071 | { return this; } | |
3072 | ||
ea664253 | 3073 | Bexpression* |
3074 | do_get_backend(Translate_context* context) | |
3075 | { return context->backend()->nil_pointer_expression(); } | |
e440a328 | 3076 | |
3077 | void | |
3078 | do_export(Export* exp) const | |
3079 | { exp->write_c_string("nil"); } | |
d751bb78 | 3080 | |
3081 | void | |
3082 | do_dump_expression(Ast_dump_context* ast_dump_context) const | |
3083 | { ast_dump_context->ostream() << "nil"; } | |
e440a328 | 3084 | }; |
3085 | ||
3086 | // Import a nil expression. | |
3087 | ||
3088 | Expression* | |
3089 | Nil_expression::do_import(Import* imp) | |
3090 | { | |
3091 | imp->require_c_string("nil"); | |
3092 | return Expression::make_nil(imp->location()); | |
3093 | } | |
3094 | ||
3095 | // Make a nil expression. | |
3096 | ||
3097 | Expression* | |
b13c66cd | 3098 | Expression::make_nil(Location location) |
e440a328 | 3099 | { |
3100 | return new Nil_expression(location); | |
3101 | } | |
3102 | ||
3103 | // The value of the predeclared constant iota. This is little more | |
3104 | // than a marker. This will be lowered to an integer in | |
3105 | // Const_expression::do_lower, which is where we know the value that | |
3106 | // it should have. | |
3107 | ||
3108 | class Iota_expression : public Parser_expression | |
3109 | { | |
3110 | public: | |
b13c66cd | 3111 | Iota_expression(Location location) |
e440a328 | 3112 | : Parser_expression(EXPRESSION_IOTA, location) |
3113 | { } | |
3114 | ||
3115 | protected: | |
3116 | Expression* | |
ceeb4318 | 3117 | do_lower(Gogo*, Named_object*, Statement_inserter*, int) |
c3e6f413 | 3118 | { go_unreachable(); } |
e440a328 | 3119 | |
3120 | // There should only ever be one of these. | |
3121 | Expression* | |
3122 | do_copy() | |
c3e6f413 | 3123 | { go_unreachable(); } |
d751bb78 | 3124 | |
3125 | void | |
3126 | do_dump_expression(Ast_dump_context* ast_dump_context) const | |
3127 | { ast_dump_context->ostream() << "iota"; } | |
e440a328 | 3128 | }; |
3129 | ||
3130 | // Make an iota expression. This is only called for one case: the | |
3131 | // value of the predeclared constant iota. | |
3132 | ||
3133 | Expression* | |
3134 | Expression::make_iota() | |
3135 | { | |
b13c66cd | 3136 | static Iota_expression iota_expression(Linemap::unknown_location()); |
e440a328 | 3137 | return &iota_expression; |
3138 | } | |
3139 | ||
da244e59 | 3140 | // Class Type_conversion_expression. |
e440a328 | 3141 | |
3142 | // Traversal. | |
3143 | ||
3144 | int | |
3145 | Type_conversion_expression::do_traverse(Traverse* traverse) | |
3146 | { | |
3147 | if (Expression::traverse(&this->expr_, traverse) == TRAVERSE_EXIT | |
3148 | || Type::traverse(this->type_, traverse) == TRAVERSE_EXIT) | |
3149 | return TRAVERSE_EXIT; | |
3150 | return TRAVERSE_CONTINUE; | |
3151 | } | |
3152 | ||
3153 | // Convert to a constant at lowering time. | |
3154 | ||
3155 | Expression* | |
ceeb4318 | 3156 | Type_conversion_expression::do_lower(Gogo*, Named_object*, |
3157 | Statement_inserter*, int) | |
e440a328 | 3158 | { |
3159 | Type* type = this->type_; | |
3160 | Expression* val = this->expr_; | |
b13c66cd | 3161 | Location location = this->location(); |
e440a328 | 3162 | |
0c77715b | 3163 | if (type->is_numeric_type()) |
e440a328 | 3164 | { |
0c77715b | 3165 | Numeric_constant nc; |
3166 | if (val->numeric_constant_value(&nc)) | |
e440a328 | 3167 | { |
0c77715b | 3168 | if (!nc.set_type(type, true, location)) |
3169 | return Expression::make_error(location); | |
3170 | return nc.expression(location); | |
e440a328 | 3171 | } |
e440a328 | 3172 | } |
3173 | ||
d7739c9a | 3174 | // According to the language specification on string conversions |
3175 | // (http://golang.org/ref/spec#Conversions_to_and_from_a_string_type): | |
3176 | // When converting an integer into a string, the string will be a UTF-8 | |
3177 | // representation of the integer and integers "outside the range of valid | |
3178 | // Unicode code points are converted to '\uFFFD'." | |
3179 | if (type->is_string_type()) | |
3180 | { | |
3181 | Numeric_constant nc; | |
3182 | if (val->numeric_constant_value(&nc) && nc.is_int()) | |
3183 | { | |
3184 | // An integer value doesn't fit in the Unicode code point range if it | |
3185 | // overflows the Go "int" type or is negative. | |
3186 | unsigned long ul; | |
3187 | if (!nc.set_type(Type::lookup_integer_type("int"), false, location) | |
3188 | || nc.to_unsigned_long(&ul) == Numeric_constant::NC_UL_NEGATIVE) | |
3189 | return Expression::make_string("\ufffd", location); | |
3190 | } | |
3191 | } | |
3192 | ||
55072f2b | 3193 | if (type->is_slice_type()) |
e440a328 | 3194 | { |
3195 | Type* element_type = type->array_type()->element_type()->forwarded(); | |
60963afd | 3196 | bool is_byte = (element_type->integer_type() != NULL |
3197 | && element_type->integer_type()->is_byte()); | |
3198 | bool is_rune = (element_type->integer_type() != NULL | |
3199 | && element_type->integer_type()->is_rune()); | |
3200 | if (is_byte || is_rune) | |
e440a328 | 3201 | { |
3202 | std::string s; | |
3203 | if (val->string_constant_value(&s)) | |
3204 | { | |
3205 | Expression_list* vals = new Expression_list(); | |
3206 | if (is_byte) | |
3207 | { | |
3208 | for (std::string::const_iterator p = s.begin(); | |
3209 | p != s.end(); | |
3210 | p++) | |
3211 | { | |
e67508fa | 3212 | unsigned char c = static_cast<unsigned char>(*p); |
3213 | vals->push_back(Expression::make_integer_ul(c, | |
3214 | element_type, | |
3215 | location)); | |
e440a328 | 3216 | } |
3217 | } | |
3218 | else | |
3219 | { | |
3220 | const char *p = s.data(); | |
3221 | const char *pend = s.data() + s.length(); | |
3222 | while (p < pend) | |
3223 | { | |
3224 | unsigned int c; | |
3225 | int adv = Lex::fetch_char(p, &c); | |
3226 | if (adv == 0) | |
3227 | { | |
631d5788 | 3228 | go_warning_at(this->location(), 0, |
e440a328 | 3229 | "invalid UTF-8 encoding"); |
3230 | adv = 1; | |
3231 | } | |
3232 | p += adv; | |
e67508fa | 3233 | vals->push_back(Expression::make_integer_ul(c, |
3234 | element_type, | |
3235 | location)); | |
e440a328 | 3236 | } |
3237 | } | |
3238 | ||
3239 | return Expression::make_slice_composite_literal(type, vals, | |
3240 | location); | |
3241 | } | |
3242 | } | |
3243 | } | |
3244 | ||
3245 | return this; | |
3246 | } | |
3247 | ||
35a54f17 | 3248 | // Flatten a type conversion by using a temporary variable for the slice |
3249 | // in slice to string conversions. | |
3250 | ||
3251 | Expression* | |
3252 | Type_conversion_expression::do_flatten(Gogo*, Named_object*, | |
3253 | Statement_inserter* inserter) | |
3254 | { | |
5bf8be8b | 3255 | if (this->type()->is_error_type() || this->expr_->is_error_expression()) |
3256 | { | |
3257 | go_assert(saw_errors()); | |
3258 | return Expression::make_error(this->location()); | |
3259 | } | |
3260 | ||
2c809f8f | 3261 | if (((this->type()->is_string_type() |
3262 | && this->expr_->type()->is_slice_type()) | |
8ba8cc87 | 3263 | || this->expr_->type()->interface_type() != NULL) |
35a54f17 | 3264 | && !this->expr_->is_variable()) |
3265 | { | |
3266 | Temporary_statement* temp = | |
3267 | Statement::make_temporary(NULL, this->expr_, this->location()); | |
3268 | inserter->insert(temp); | |
3269 | this->expr_ = Expression::make_temporary_reference(temp, this->location()); | |
3270 | } | |
3271 | return this; | |
3272 | } | |
3273 | ||
1ca01a59 | 3274 | // Return whether a type conversion is a constant. |
3275 | ||
3276 | bool | |
3277 | Type_conversion_expression::do_is_constant() const | |
3278 | { | |
3279 | if (!this->expr_->is_constant()) | |
3280 | return false; | |
3281 | ||
3282 | // A conversion to a type that may not be used as a constant is not | |
3283 | // a constant. For example, []byte(nil). | |
3284 | Type* type = this->type_; | |
3285 | if (type->integer_type() == NULL | |
3286 | && type->float_type() == NULL | |
3287 | && type->complex_type() == NULL | |
3288 | && !type->is_boolean_type() | |
3289 | && !type->is_string_type()) | |
3290 | return false; | |
3291 | ||
3292 | return true; | |
3293 | } | |
3294 | ||
3ae06f68 | 3295 | // Return whether a type conversion can be used in a constant |
3296 | // initializer. | |
0e168074 | 3297 | |
3298 | bool | |
3ae06f68 | 3299 | Type_conversion_expression::do_is_static_initializer() const |
0e168074 | 3300 | { |
3301 | Type* type = this->type_; | |
3302 | Type* expr_type = this->expr_->type(); | |
3303 | ||
3304 | if (type->interface_type() != NULL | |
3305 | || expr_type->interface_type() != NULL) | |
3306 | return false; | |
3307 | ||
3ae06f68 | 3308 | if (!this->expr_->is_static_initializer()) |
0e168074 | 3309 | return false; |
3310 | ||
3311 | if (Type::are_identical(type, expr_type, false, NULL)) | |
3312 | return true; | |
3313 | ||
03118c21 | 3314 | if (type->is_string_type() && expr_type->is_string_type()) |
3315 | return true; | |
3316 | ||
3317 | if ((type->is_numeric_type() | |
3318 | || type->is_boolean_type() | |
3319 | || type->points_to() != NULL) | |
3320 | && (expr_type->is_numeric_type() | |
3321 | || expr_type->is_boolean_type() | |
3322 | || expr_type->points_to() != NULL)) | |
3323 | return true; | |
3324 | ||
3325 | return false; | |
0e168074 | 3326 | } |
3327 | ||
0c77715b | 3328 | // Return the constant numeric value if there is one. |
e440a328 | 3329 | |
3330 | bool | |
0c77715b | 3331 | Type_conversion_expression::do_numeric_constant_value( |
3332 | Numeric_constant* nc) const | |
e440a328 | 3333 | { |
0c77715b | 3334 | if (!this->type_->is_numeric_type()) |
e440a328 | 3335 | return false; |
0c77715b | 3336 | if (!this->expr_->numeric_constant_value(nc)) |
e440a328 | 3337 | return false; |
0c77715b | 3338 | return nc->set_type(this->type_, false, this->location()); |
e440a328 | 3339 | } |
3340 | ||
3341 | // Return the constant string value if there is one. | |
3342 | ||
3343 | bool | |
3344 | Type_conversion_expression::do_string_constant_value(std::string* val) const | |
3345 | { | |
3346 | if (this->type_->is_string_type() | |
3347 | && this->expr_->type()->integer_type() != NULL) | |
3348 | { | |
0c77715b | 3349 | Numeric_constant nc; |
3350 | if (this->expr_->numeric_constant_value(&nc)) | |
e440a328 | 3351 | { |
0c77715b | 3352 | unsigned long ival; |
3353 | if (nc.to_unsigned_long(&ival) == Numeric_constant::NC_UL_VALID) | |
e440a328 | 3354 | { |
0c77715b | 3355 | val->clear(); |
3356 | Lex::append_char(ival, true, val, this->location()); | |
e440a328 | 3357 | return true; |
3358 | } | |
3359 | } | |
e440a328 | 3360 | } |
3361 | ||
3362 | // FIXME: Could handle conversion from const []int here. | |
3363 | ||
3364 | return false; | |
3365 | } | |
3366 | ||
da244e59 | 3367 | // Determine the resulting type of the conversion. |
3368 | ||
3369 | void | |
3370 | Type_conversion_expression::do_determine_type(const Type_context*) | |
3371 | { | |
3372 | Type_context subcontext(this->type_, false); | |
3373 | this->expr_->determine_type(&subcontext); | |
3374 | } | |
3375 | ||
e440a328 | 3376 | // Check that types are convertible. |
3377 | ||
3378 | void | |
3379 | Type_conversion_expression::do_check_types(Gogo*) | |
3380 | { | |
3381 | Type* type = this->type_; | |
3382 | Type* expr_type = this->expr_->type(); | |
3383 | std::string reason; | |
3384 | ||
5c13bd80 | 3385 | if (type->is_error() || expr_type->is_error()) |
842f6425 | 3386 | { |
842f6425 | 3387 | this->set_is_error(); |
3388 | return; | |
3389 | } | |
3390 | ||
e440a328 | 3391 | if (this->may_convert_function_types_ |
3392 | && type->function_type() != NULL | |
3393 | && expr_type->function_type() != NULL) | |
3394 | return; | |
3395 | ||
3396 | if (Type::are_convertible(type, expr_type, &reason)) | |
3397 | return; | |
3398 | ||
631d5788 | 3399 | go_error_at(this->location(), "%s", reason.c_str()); |
e440a328 | 3400 | this->set_is_error(); |
3401 | } | |
3402 | ||
ea664253 | 3403 | // Get the backend representation for a type conversion. |
e440a328 | 3404 | |
ea664253 | 3405 | Bexpression* |
3406 | Type_conversion_expression::do_get_backend(Translate_context* context) | |
e440a328 | 3407 | { |
e440a328 | 3408 | Type* type = this->type_; |
3409 | Type* expr_type = this->expr_->type(); | |
2c809f8f | 3410 | |
3411 | Gogo* gogo = context->gogo(); | |
3412 | Btype* btype = type->get_backend(gogo); | |
ea664253 | 3413 | Bexpression* bexpr = this->expr_->get_backend(context); |
2c809f8f | 3414 | Location loc = this->location(); |
3415 | ||
3416 | if (Type::are_identical(type, expr_type, false, NULL)) | |
ea664253 | 3417 | return gogo->backend()->convert_expression(btype, bexpr, loc); |
2c809f8f | 3418 | else if (type->interface_type() != NULL |
3419 | || expr_type->interface_type() != NULL) | |
e440a328 | 3420 | { |
2c809f8f | 3421 | Expression* conversion = |
3422 | Expression::convert_for_assignment(gogo, type, this->expr_, | |
3423 | this->location()); | |
ea664253 | 3424 | return conversion->get_backend(context); |
e440a328 | 3425 | } |
3426 | else if (type->is_string_type() | |
3427 | && expr_type->integer_type() != NULL) | |
3428 | { | |
2c809f8f | 3429 | mpz_t intval; |
3430 | Numeric_constant nc; | |
3431 | if (this->expr_->numeric_constant_value(&nc) | |
3432 | && nc.to_int(&intval) | |
3433 | && mpz_fits_ushort_p(intval)) | |
e440a328 | 3434 | { |
e440a328 | 3435 | std::string s; |
2c809f8f | 3436 | Lex::append_char(mpz_get_ui(intval), true, &s, loc); |
3437 | mpz_clear(intval); | |
3438 | Expression* se = Expression::make_string(s, loc); | |
ea664253 | 3439 | return se->get_backend(context); |
e440a328 | 3440 | } |
3441 | ||
f16ab008 | 3442 | Expression* i2s_expr = |
736a16ba | 3443 | Runtime::make_call(Runtime::INTSTRING, loc, 2, |
3444 | Expression::make_nil(loc), this->expr_); | |
ea664253 | 3445 | return Expression::make_cast(type, i2s_expr, loc)->get_backend(context); |
e440a328 | 3446 | } |
55072f2b | 3447 | else if (type->is_string_type() && expr_type->is_slice_type()) |
e440a328 | 3448 | { |
55072f2b | 3449 | Array_type* a = expr_type->array_type(); |
e440a328 | 3450 | Type* e = a->element_type()->forwarded(); |
c484d925 | 3451 | go_assert(e->integer_type() != NULL); |
35a54f17 | 3452 | go_assert(this->expr_->is_variable()); |
3453 | ||
3454 | Runtime::Function code; | |
60963afd | 3455 | if (e->integer_type()->is_byte()) |
736a16ba | 3456 | code = Runtime::SLICEBYTETOSTRING; |
e440a328 | 3457 | else |
35a54f17 | 3458 | { |
3459 | go_assert(e->integer_type()->is_rune()); | |
736a16ba | 3460 | code = Runtime::SLICERUNETOSTRING; |
35a54f17 | 3461 | } |
736a16ba | 3462 | return Runtime::make_call(code, loc, 2, Expression::make_nil(loc), |
3463 | this->expr_)->get_backend(context); | |
e440a328 | 3464 | } |
411eb89e | 3465 | else if (type->is_slice_type() && expr_type->is_string_type()) |
e440a328 | 3466 | { |
3467 | Type* e = type->array_type()->element_type()->forwarded(); | |
c484d925 | 3468 | go_assert(e->integer_type() != NULL); |
6c252e42 | 3469 | |
2c809f8f | 3470 | Runtime::Function code; |
60963afd | 3471 | if (e->integer_type()->is_byte()) |
736a16ba | 3472 | code = Runtime::STRINGTOSLICEBYTE; |
e440a328 | 3473 | else |
3474 | { | |
60963afd | 3475 | go_assert(e->integer_type()->is_rune()); |
736a16ba | 3476 | code = Runtime::STRINGTOSLICERUNE; |
e440a328 | 3477 | } |
736a16ba | 3478 | Expression* s2a = Runtime::make_call(code, loc, 2, |
3479 | Expression::make_nil(loc), | |
3480 | this->expr_); | |
ea664253 | 3481 | return Expression::make_unsafe_cast(type, s2a, loc)->get_backend(context); |
2c809f8f | 3482 | } |
3483 | else if (type->is_numeric_type()) | |
3484 | { | |
3485 | go_assert(Type::are_convertible(type, expr_type, NULL)); | |
ea664253 | 3486 | return gogo->backend()->convert_expression(btype, bexpr, loc); |
e440a328 | 3487 | } |
3488 | else if ((type->is_unsafe_pointer_type() | |
2c809f8f | 3489 | && (expr_type->points_to() != NULL |
3490 | || expr_type->integer_type())) | |
3491 | || (expr_type->is_unsafe_pointer_type() | |
3492 | && type->points_to() != NULL) | |
3493 | || (this->may_convert_function_types_ | |
3494 | && type->function_type() != NULL | |
3495 | && expr_type->function_type() != NULL)) | |
ea664253 | 3496 | return gogo->backend()->convert_expression(btype, bexpr, loc); |
e440a328 | 3497 | else |
2c809f8f | 3498 | { |
3499 | Expression* conversion = | |
3500 | Expression::convert_for_assignment(gogo, type, this->expr_, loc); | |
ea664253 | 3501 | return conversion->get_backend(context); |
2c809f8f | 3502 | } |
e440a328 | 3503 | } |
3504 | ||
3505 | // Output a type conversion in a constant expression. | |
3506 | ||
3507 | void | |
3508 | Type_conversion_expression::do_export(Export* exp) const | |
3509 | { | |
3510 | exp->write_c_string("convert("); | |
3511 | exp->write_type(this->type_); | |
3512 | exp->write_c_string(", "); | |
3513 | this->expr_->export_expression(exp); | |
3514 | exp->write_c_string(")"); | |
3515 | } | |
3516 | ||
3517 | // Import a type conversion or a struct construction. | |
3518 | ||
3519 | Expression* | |
3520 | Type_conversion_expression::do_import(Import* imp) | |
3521 | { | |
3522 | imp->require_c_string("convert("); | |
3523 | Type* type = imp->read_type(); | |
3524 | imp->require_c_string(", "); | |
3525 | Expression* val = Expression::import_expression(imp); | |
3526 | imp->require_c_string(")"); | |
3527 | return Expression::make_cast(type, val, imp->location()); | |
3528 | } | |
3529 | ||
d751bb78 | 3530 | // Dump ast representation for a type conversion expression. |
3531 | ||
3532 | void | |
3533 | Type_conversion_expression::do_dump_expression( | |
3534 | Ast_dump_context* ast_dump_context) const | |
3535 | { | |
3536 | ast_dump_context->dump_type(this->type_); | |
3537 | ast_dump_context->ostream() << "("; | |
3538 | ast_dump_context->dump_expression(this->expr_); | |
3539 | ast_dump_context->ostream() << ") "; | |
3540 | } | |
3541 | ||
e440a328 | 3542 | // Make a type cast expression. |
3543 | ||
3544 | Expression* | |
b13c66cd | 3545 | Expression::make_cast(Type* type, Expression* val, Location location) |
e440a328 | 3546 | { |
3547 | if (type->is_error_type() || val->is_error_expression()) | |
3548 | return Expression::make_error(location); | |
3549 | return new Type_conversion_expression(type, val, location); | |
3550 | } | |
3551 | ||
98f62f7a | 3552 | // Class Unsafe_type_conversion_expression. |
9581e91d | 3553 | |
3554 | // Traversal. | |
3555 | ||
3556 | int | |
3557 | Unsafe_type_conversion_expression::do_traverse(Traverse* traverse) | |
3558 | { | |
3559 | if (Expression::traverse(&this->expr_, traverse) == TRAVERSE_EXIT | |
3560 | || Type::traverse(this->type_, traverse) == TRAVERSE_EXIT) | |
3561 | return TRAVERSE_EXIT; | |
3562 | return TRAVERSE_CONTINUE; | |
3563 | } | |
3564 | ||
3ae06f68 | 3565 | // Return whether an unsafe type conversion can be used as a constant |
3566 | // initializer. | |
aa5ae575 | 3567 | |
3568 | bool | |
3ae06f68 | 3569 | Unsafe_type_conversion_expression::do_is_static_initializer() const |
aa5ae575 | 3570 | { |
3571 | Type* type = this->type_; | |
3572 | Type* expr_type = this->expr_->type(); | |
3573 | ||
3574 | if (type->interface_type() != NULL | |
3575 | || expr_type->interface_type() != NULL) | |
3576 | return false; | |
3577 | ||
3ae06f68 | 3578 | if (!this->expr_->is_static_initializer()) |
aa5ae575 | 3579 | return false; |
3580 | ||
3581 | if (Type::are_convertible(type, expr_type, NULL)) | |
3582 | return true; | |
3583 | ||
03118c21 | 3584 | if (type->is_string_type() && expr_type->is_string_type()) |
3585 | return true; | |
3586 | ||
3587 | if ((type->is_numeric_type() | |
3588 | || type->is_boolean_type() | |
3589 | || type->points_to() != NULL) | |
3590 | && (expr_type->is_numeric_type() | |
3591 | || expr_type->is_boolean_type() | |
3592 | || expr_type->points_to() != NULL)) | |
3593 | return true; | |
3594 | ||
3595 | return false; | |
aa5ae575 | 3596 | } |
3597 | ||
9581e91d | 3598 | // Convert to backend representation. |
3599 | ||
ea664253 | 3600 | Bexpression* |
3601 | Unsafe_type_conversion_expression::do_get_backend(Translate_context* context) | |
9581e91d | 3602 | { |
3603 | // We are only called for a limited number of cases. | |
3604 | ||
3605 | Type* t = this->type_; | |
3606 | Type* et = this->expr_->type(); | |
5c4802f1 | 3607 | |
3608 | if (t->is_error_type() | |
3609 | || this->expr_->is_error_expression() | |
3610 | || et->is_error_type()) | |
3611 | { | |
3612 | go_assert(saw_errors()); | |
3613 | return context->backend()->error_expression(); | |
3614 | } | |
3615 | ||
2c809f8f | 3616 | if (t->array_type() != NULL) |
3617 | go_assert(et->array_type() != NULL | |
3618 | && t->is_slice_type() == et->is_slice_type()); | |
3619 | else if (t->struct_type() != NULL) | |
9581e91d | 3620 | { |
2c809f8f | 3621 | if (t->named_type() != NULL |
3622 | && et->named_type() != NULL | |
3623 | && !Type::are_convertible(t, et, NULL)) | |
3624 | { | |
3625 | go_assert(saw_errors()); | |
ea664253 | 3626 | return context->backend()->error_expression(); |
2c809f8f | 3627 | } |
3628 | ||
3629 | go_assert(et->struct_type() != NULL | |
3630 | && Type::are_convertible(t, et, NULL)); | |
3631 | } | |
3632 | else if (t->map_type() != NULL) | |
c484d925 | 3633 | go_assert(et->map_type() != NULL); |
9581e91d | 3634 | else if (t->channel_type() != NULL) |
c484d925 | 3635 | go_assert(et->channel_type() != NULL); |
09ea332d | 3636 | else if (t->points_to() != NULL) |
2c809f8f | 3637 | go_assert(et->points_to() != NULL |
3638 | || et->channel_type() != NULL | |
3639 | || et->map_type() != NULL | |
3640 | || et->function_type() != NULL | |
132ed071 | 3641 | || et->integer_type() != NULL |
2c809f8f | 3642 | || et->is_nil_type()); |
9581e91d | 3643 | else if (et->is_unsafe_pointer_type()) |
c484d925 | 3644 | go_assert(t->points_to() != NULL); |
2c809f8f | 3645 | else if (t->interface_type() != NULL) |
9581e91d | 3646 | { |
2c809f8f | 3647 | bool empty_iface = t->interface_type()->is_empty(); |
c484d925 | 3648 | go_assert(et->interface_type() != NULL |
2c809f8f | 3649 | && et->interface_type()->is_empty() == empty_iface); |
9581e91d | 3650 | } |
588e3cf9 | 3651 | else if (t->integer_type() != NULL) |
2c809f8f | 3652 | go_assert(et->is_boolean_type() |
3653 | || et->integer_type() != NULL | |
3654 | || et->function_type() != NULL | |
3655 | || et->points_to() != NULL | |
3656 | || et->map_type() != NULL | |
8ba8cc87 | 3657 | || et->channel_type() != NULL |
3658 | || et->is_nil_type()); | |
cd39797e | 3659 | else if (t->function_type() != NULL) |
3660 | go_assert(et->points_to() != NULL); | |
9581e91d | 3661 | else |
c3e6f413 | 3662 | go_unreachable(); |
9581e91d | 3663 | |
2c809f8f | 3664 | Gogo* gogo = context->gogo(); |
3665 | Btype* btype = t->get_backend(gogo); | |
ea664253 | 3666 | Bexpression* bexpr = this->expr_->get_backend(context); |
2c809f8f | 3667 | Location loc = this->location(); |
ea664253 | 3668 | return gogo->backend()->convert_expression(btype, bexpr, loc); |
9581e91d | 3669 | } |
3670 | ||
d751bb78 | 3671 | // Dump ast representation for an unsafe type conversion expression. |
3672 | ||
3673 | void | |
3674 | Unsafe_type_conversion_expression::do_dump_expression( | |
3675 | Ast_dump_context* ast_dump_context) const | |
3676 | { | |
3677 | ast_dump_context->dump_type(this->type_); | |
3678 | ast_dump_context->ostream() << "("; | |
3679 | ast_dump_context->dump_expression(this->expr_); | |
3680 | ast_dump_context->ostream() << ") "; | |
3681 | } | |
3682 | ||
9581e91d | 3683 | // Make an unsafe type conversion expression. |
3684 | ||
3685 | Expression* | |
3686 | Expression::make_unsafe_cast(Type* type, Expression* expr, | |
b13c66cd | 3687 | Location location) |
9581e91d | 3688 | { |
3689 | return new Unsafe_type_conversion_expression(type, expr, location); | |
3690 | } | |
3691 | ||
76f85fd6 | 3692 | // Class Unary_expression. |
e440a328 | 3693 | |
03118c21 | 3694 | // Call the address_taken method of the operand if needed. This is |
3695 | // called after escape analysis but before inserting write barriers. | |
3696 | ||
3697 | void | |
3698 | Unary_expression::check_operand_address_taken(Gogo* gogo) | |
3699 | { | |
3700 | if (this->op_ != OPERATOR_AND) | |
3701 | return; | |
3702 | ||
3703 | // If this->escapes_ is false at this point, then it was set to | |
3704 | // false by an explicit call to set_does_not_escape, and the value | |
3705 | // does not escape. If this->escapes_ is true, we may be able to | |
3706 | // set it to false if taking the address of a variable that does not | |
3707 | // escape. | |
3708 | Node* n = Node::make_node(this); | |
3709 | if ((n->encoding() & ESCAPE_MASK) == int(Node::ESCAPE_NONE)) | |
3710 | this->escapes_ = false; | |
3711 | ||
3712 | // When compiling the runtime, the address operator does not cause | |
3713 | // local variables to escape. When escape analysis becomes the | |
3714 | // default, this should be changed to make it an error if we have an | |
3715 | // address operator that escapes. | |
3716 | if (gogo->compiling_runtime() && gogo->package_name() == "runtime") | |
3717 | this->escapes_ = false; | |
3718 | ||
3719 | Named_object* var = NULL; | |
3720 | if (this->expr_->var_expression() != NULL) | |
3721 | var = this->expr_->var_expression()->named_object(); | |
3722 | else if (this->expr_->enclosed_var_expression() != NULL) | |
3723 | var = this->expr_->enclosed_var_expression()->variable(); | |
3724 | ||
3725 | if (this->escapes_ && var != NULL) | |
3726 | { | |
3727 | if (var->is_variable()) | |
3728 | this->escapes_ = var->var_value()->escapes(); | |
3729 | if (var->is_result_variable()) | |
3730 | this->escapes_ = var->result_var_value()->escapes(); | |
3731 | } | |
3732 | ||
3733 | this->expr_->address_taken(this->escapes_); | |
3734 | } | |
3735 | ||
e440a328 | 3736 | // If we are taking the address of a composite literal, and the |
2c809f8f | 3737 | // contents are not constant, then we want to make a heap expression |
e440a328 | 3738 | // instead. |
3739 | ||
3740 | Expression* | |
ceeb4318 | 3741 | Unary_expression::do_lower(Gogo*, Named_object*, Statement_inserter*, int) |
e440a328 | 3742 | { |
b13c66cd | 3743 | Location loc = this->location(); |
e440a328 | 3744 | Operator op = this->op_; |
3745 | Expression* expr = this->expr_; | |
3746 | ||
3747 | if (op == OPERATOR_MULT && expr->is_type_expression()) | |
3748 | return Expression::make_type(Type::make_pointer_type(expr->type()), loc); | |
3749 | ||
3750 | // *&x simplifies to x. *(*T)(unsafe.Pointer)(&x) does not require | |
3751 | // moving x to the heap. FIXME: Is it worth doing a real escape | |
3752 | // analysis here? This case is found in math/unsafe.go and is | |
3753 | // therefore worth special casing. | |
3754 | if (op == OPERATOR_MULT) | |
3755 | { | |
3756 | Expression* e = expr; | |
3757 | while (e->classification() == EXPRESSION_CONVERSION) | |
3758 | { | |
3759 | Type_conversion_expression* te | |
3760 | = static_cast<Type_conversion_expression*>(e); | |
3761 | e = te->expr(); | |
3762 | } | |
3763 | ||
3764 | if (e->classification() == EXPRESSION_UNARY) | |
3765 | { | |
3766 | Unary_expression* ue = static_cast<Unary_expression*>(e); | |
3767 | if (ue->op_ == OPERATOR_AND) | |
3768 | { | |
3769 | if (e == expr) | |
3770 | { | |
3771 | // *&x == x. | |
f4dea966 | 3772 | if (!ue->expr_->is_addressable() && !ue->create_temp_) |
3773 | { | |
631d5788 | 3774 | go_error_at(ue->location(), |
3775 | "invalid operand for unary %<&%>"); | |
f4dea966 | 3776 | this->set_is_error(); |
3777 | } | |
e440a328 | 3778 | return ue->expr_; |
3779 | } | |
3780 | ue->set_does_not_escape(); | |
3781 | } | |
3782 | } | |
3783 | } | |
3784 | ||
55661ce9 | 3785 | // Catching an invalid indirection of unsafe.Pointer here avoid |
3786 | // having to deal with TYPE_VOID in other places. | |
3787 | if (op == OPERATOR_MULT && expr->type()->is_unsafe_pointer_type()) | |
3788 | { | |
631d5788 | 3789 | go_error_at(this->location(), "invalid indirect of %<unsafe.Pointer%>"); |
55661ce9 | 3790 | return Expression::make_error(this->location()); |
3791 | } | |
3792 | ||
d9f3743a | 3793 | // Check for an invalid pointer dereference. We need to do this |
3794 | // here because Unary_expression::do_type will return an error type | |
3795 | // in this case. That can cause code to appear erroneous, and | |
3796 | // therefore disappear at lowering time, without any error message. | |
3797 | if (op == OPERATOR_MULT && expr->type()->points_to() == NULL) | |
3798 | { | |
3799 | this->report_error(_("expected pointer")); | |
3800 | return Expression::make_error(this->location()); | |
3801 | } | |
3802 | ||
59a401fe | 3803 | if (op == OPERATOR_PLUS || op == OPERATOR_MINUS || op == OPERATOR_XOR) |
e440a328 | 3804 | { |
0c77715b | 3805 | Numeric_constant nc; |
3806 | if (expr->numeric_constant_value(&nc)) | |
e440a328 | 3807 | { |
0c77715b | 3808 | Numeric_constant result; |
af7a5274 | 3809 | bool issued_error; |
3810 | if (Unary_expression::eval_constant(op, &nc, loc, &result, | |
3811 | &issued_error)) | |
0c77715b | 3812 | return result.expression(loc); |
af7a5274 | 3813 | else if (issued_error) |
3814 | return Expression::make_error(this->location()); | |
e440a328 | 3815 | } |
3816 | } | |
3817 | ||
3818 | return this; | |
3819 | } | |
3820 | ||
f9ca30f9 | 3821 | // Flatten expression if a nil check must be performed and create temporary |
3822 | // variables if necessary. | |
3823 | ||
3824 | Expression* | |
3825 | Unary_expression::do_flatten(Gogo* gogo, Named_object*, | |
3826 | Statement_inserter* inserter) | |
3827 | { | |
5bf8be8b | 3828 | if (this->is_error_expression() |
3829 | || this->expr_->is_error_expression() | |
3830 | || this->expr_->type()->is_error_type()) | |
3831 | { | |
3832 | go_assert(saw_errors()); | |
3833 | return Expression::make_error(this->location()); | |
3834 | } | |
f4dea966 | 3835 | |
f9ca30f9 | 3836 | Location location = this->location(); |
3837 | if (this->op_ == OPERATOR_MULT | |
3838 | && !this->expr_->is_variable()) | |
3839 | { | |
3840 | go_assert(this->expr_->type()->points_to() != NULL); | |
3841 | Type* ptype = this->expr_->type()->points_to(); | |
3842 | if (!ptype->is_void_type()) | |
3843 | { | |
2a305b85 | 3844 | int64_t s; |
3845 | bool ok = ptype->backend_type_size(gogo, &s); | |
3846 | if (!ok) | |
3847 | { | |
3848 | go_assert(saw_errors()); | |
3849 | return Expression::make_error(this->location()); | |
3850 | } | |
f9ca30f9 | 3851 | if (s >= 4096 || this->issue_nil_check_) |
3852 | { | |
3853 | Temporary_statement* temp = | |
3854 | Statement::make_temporary(NULL, this->expr_, location); | |
3855 | inserter->insert(temp); | |
3856 | this->expr_ = | |
3857 | Expression::make_temporary_reference(temp, location); | |
3858 | } | |
3859 | } | |
3860 | } | |
3861 | ||
3862 | if (this->create_temp_ && !this->expr_->is_variable()) | |
3863 | { | |
3864 | Temporary_statement* temp = | |
3865 | Statement::make_temporary(NULL, this->expr_, location); | |
3866 | inserter->insert(temp); | |
3867 | this->expr_ = Expression::make_temporary_reference(temp, location); | |
3868 | } | |
3869 | ||
3870 | return this; | |
3871 | } | |
3872 | ||
e440a328 | 3873 | // Return whether a unary expression is a constant. |
3874 | ||
3875 | bool | |
3876 | Unary_expression::do_is_constant() const | |
3877 | { | |
3878 | if (this->op_ == OPERATOR_MULT) | |
3879 | { | |
3880 | // Indirecting through a pointer is only constant if the object | |
3881 | // to which the expression points is constant, but we currently | |
3882 | // have no way to determine that. | |
3883 | return false; | |
3884 | } | |
3885 | else if (this->op_ == OPERATOR_AND) | |
3886 | { | |
3887 | // Taking the address of a variable is constant if it is a | |
f9ca30f9 | 3888 | // global variable, not constant otherwise. In other cases taking the |
3889 | // address is probably not a constant. | |
e440a328 | 3890 | Var_expression* ve = this->expr_->var_expression(); |
3891 | if (ve != NULL) | |
3892 | { | |
3893 | Named_object* no = ve->named_object(); | |
3894 | return no->is_variable() && no->var_value()->is_global(); | |
3895 | } | |
3896 | return false; | |
3897 | } | |
3898 | else | |
3899 | return this->expr_->is_constant(); | |
3900 | } | |
3901 | ||
3ae06f68 | 3902 | // Return whether a unary expression can be used as a constant |
3903 | // initializer. | |
3904 | ||
3905 | bool | |
3906 | Unary_expression::do_is_static_initializer() const | |
3907 | { | |
3908 | if (this->op_ == OPERATOR_MULT) | |
3909 | return false; | |
3910 | else if (this->op_ == OPERATOR_AND) | |
de048538 | 3911 | return Unary_expression::base_is_static_initializer(this->expr_); |
3912 | else | |
3913 | return this->expr_->is_static_initializer(); | |
3914 | } | |
3ae06f68 | 3915 | |
de048538 | 3916 | // Return whether the address of EXPR can be used as a static |
3917 | // initializer. | |
3ae06f68 | 3918 | |
de048538 | 3919 | bool |
3920 | Unary_expression::base_is_static_initializer(Expression* expr) | |
3921 | { | |
3922 | // The address of a field reference can be a static initializer if | |
3923 | // the base can be a static initializer. | |
3924 | Field_reference_expression* fre = expr->field_reference_expression(); | |
3925 | if (fre != NULL) | |
3926 | return Unary_expression::base_is_static_initializer(fre->expr()); | |
3927 | ||
3928 | // The address of an index expression can be a static initializer if | |
3929 | // the base can be a static initializer and the index is constant. | |
3930 | Array_index_expression* aind = expr->array_index_expression(); | |
3931 | if (aind != NULL) | |
3932 | return (aind->end() == NULL | |
3933 | && aind->start()->is_constant() | |
3934 | && Unary_expression::base_is_static_initializer(aind->array())); | |
3935 | ||
3936 | // The address of a global variable can be a static initializer. | |
3937 | Var_expression* ve = expr->var_expression(); | |
3938 | if (ve != NULL) | |
3939 | { | |
3940 | Named_object* no = ve->named_object(); | |
3941 | return no->is_variable() && no->var_value()->is_global(); | |
3942 | } | |
3943 | ||
3944 | // The address of a composite literal can be used as a static | |
3945 | // initializer if the composite literal is itself usable as a | |
3946 | // static initializer. | |
3947 | if (expr->is_composite_literal() && expr->is_static_initializer()) | |
3948 | return true; | |
3ae06f68 | 3949 | |
de048538 | 3950 | // The address of a string constant can be used as a static |
3951 | // initializer. This can not be written in Go itself but this is | |
3952 | // used when building a type descriptor. | |
3953 | if (expr->string_expression() != NULL) | |
3954 | return true; | |
3955 | ||
3956 | return false; | |
3ae06f68 | 3957 | } |
3958 | ||
0c77715b | 3959 | // Apply unary opcode OP to UNC, setting NC. Return true if this |
af7a5274 | 3960 | // could be done, false if not. On overflow, issues an error and sets |
3961 | // *ISSUED_ERROR. | |
e440a328 | 3962 | |
3963 | bool | |
0c77715b | 3964 | Unary_expression::eval_constant(Operator op, const Numeric_constant* unc, |
af7a5274 | 3965 | Location location, Numeric_constant* nc, |
3966 | bool* issued_error) | |
e440a328 | 3967 | { |
af7a5274 | 3968 | *issued_error = false; |
e440a328 | 3969 | switch (op) |
3970 | { | |
3971 | case OPERATOR_PLUS: | |
0c77715b | 3972 | *nc = *unc; |
e440a328 | 3973 | return true; |
0c77715b | 3974 | |
e440a328 | 3975 | case OPERATOR_MINUS: |
0c77715b | 3976 | if (unc->is_int() || unc->is_rune()) |
3977 | break; | |
3978 | else if (unc->is_float()) | |
3979 | { | |
3980 | mpfr_t uval; | |
3981 | unc->get_float(&uval); | |
3982 | mpfr_t val; | |
3983 | mpfr_init(val); | |
3984 | mpfr_neg(val, uval, GMP_RNDN); | |
3985 | nc->set_float(unc->type(), val); | |
3986 | mpfr_clear(uval); | |
3987 | mpfr_clear(val); | |
3988 | return true; | |
3989 | } | |
3990 | else if (unc->is_complex()) | |
3991 | { | |
fcbea5e4 | 3992 | mpc_t uval; |
3993 | unc->get_complex(&uval); | |
3994 | mpc_t val; | |
3995 | mpc_init2(val, mpc_precision); | |
3996 | mpc_neg(val, uval, MPC_RNDNN); | |
3997 | nc->set_complex(unc->type(), val); | |
3998 | mpc_clear(uval); | |
3999 | mpc_clear(val); | |
0c77715b | 4000 | return true; |
4001 | } | |
e440a328 | 4002 | else |
0c77715b | 4003 | go_unreachable(); |
e440a328 | 4004 | |
0c77715b | 4005 | case OPERATOR_XOR: |
4006 | break; | |
68448d53 | 4007 | |
59a401fe | 4008 | case OPERATOR_NOT: |
e440a328 | 4009 | case OPERATOR_AND: |
4010 | case OPERATOR_MULT: | |
4011 | return false; | |
0c77715b | 4012 | |
e440a328 | 4013 | default: |
c3e6f413 | 4014 | go_unreachable(); |
e440a328 | 4015 | } |
e440a328 | 4016 | |
0c77715b | 4017 | if (!unc->is_int() && !unc->is_rune()) |
4018 | return false; | |
4019 | ||
4020 | mpz_t uval; | |
8387e1df | 4021 | if (unc->is_rune()) |
4022 | unc->get_rune(&uval); | |
4023 | else | |
4024 | unc->get_int(&uval); | |
0c77715b | 4025 | mpz_t val; |
4026 | mpz_init(val); | |
e440a328 | 4027 | |
e440a328 | 4028 | switch (op) |
4029 | { | |
e440a328 | 4030 | case OPERATOR_MINUS: |
0c77715b | 4031 | mpz_neg(val, uval); |
4032 | break; | |
4033 | ||
e440a328 | 4034 | case OPERATOR_NOT: |
0c77715b | 4035 | mpz_set_ui(val, mpz_cmp_si(uval, 0) == 0 ? 1 : 0); |
4036 | break; | |
4037 | ||
e440a328 | 4038 | case OPERATOR_XOR: |
0c77715b | 4039 | { |
4040 | Type* utype = unc->type(); | |
4041 | if (utype->integer_type() == NULL | |
4042 | || utype->integer_type()->is_abstract()) | |
4043 | mpz_com(val, uval); | |
4044 | else | |
4045 | { | |
4046 | // The number of HOST_WIDE_INTs that it takes to represent | |
4047 | // UVAL. | |
4048 | size_t count = ((mpz_sizeinbase(uval, 2) | |
4049 | + HOST_BITS_PER_WIDE_INT | |
4050 | - 1) | |
4051 | / HOST_BITS_PER_WIDE_INT); | |
e440a328 | 4052 | |
0c77715b | 4053 | unsigned HOST_WIDE_INT* phwi = new unsigned HOST_WIDE_INT[count]; |
4054 | memset(phwi, 0, count * sizeof(HOST_WIDE_INT)); | |
4055 | ||
4056 | size_t obits = utype->integer_type()->bits(); | |
4057 | ||
4058 | if (!utype->integer_type()->is_unsigned() && mpz_sgn(uval) < 0) | |
4059 | { | |
4060 | mpz_t adj; | |
4061 | mpz_init_set_ui(adj, 1); | |
4062 | mpz_mul_2exp(adj, adj, obits); | |
4063 | mpz_add(uval, uval, adj); | |
4064 | mpz_clear(adj); | |
4065 | } | |
4066 | ||
4067 | size_t ecount; | |
4068 | mpz_export(phwi, &ecount, -1, sizeof(HOST_WIDE_INT), 0, 0, uval); | |
4069 | go_assert(ecount <= count); | |
4070 | ||
4071 | // Trim down to the number of words required by the type. | |
4072 | size_t ocount = ((obits + HOST_BITS_PER_WIDE_INT - 1) | |
4073 | / HOST_BITS_PER_WIDE_INT); | |
4074 | go_assert(ocount <= count); | |
4075 | ||
4076 | for (size_t i = 0; i < ocount; ++i) | |
4077 | phwi[i] = ~phwi[i]; | |
4078 | ||
4079 | size_t clearbits = ocount * HOST_BITS_PER_WIDE_INT - obits; | |
4080 | if (clearbits != 0) | |
4081 | phwi[ocount - 1] &= (((unsigned HOST_WIDE_INT) (HOST_WIDE_INT) -1) | |
4082 | >> clearbits); | |
4083 | ||
4084 | mpz_import(val, ocount, -1, sizeof(HOST_WIDE_INT), 0, 0, phwi); | |
4085 | ||
4086 | if (!utype->integer_type()->is_unsigned() | |
4087 | && mpz_tstbit(val, obits - 1)) | |
4088 | { | |
4089 | mpz_t adj; | |
4090 | mpz_init_set_ui(adj, 1); | |
4091 | mpz_mul_2exp(adj, adj, obits); | |
4092 | mpz_sub(val, val, adj); | |
4093 | mpz_clear(adj); | |
4094 | } | |
4095 | ||
4096 | delete[] phwi; | |
4097 | } | |
4098 | } | |
4099 | break; | |
e440a328 | 4100 | |
e440a328 | 4101 | default: |
c3e6f413 | 4102 | go_unreachable(); |
e440a328 | 4103 | } |
e440a328 | 4104 | |
0c77715b | 4105 | if (unc->is_rune()) |
4106 | nc->set_rune(NULL, val); | |
e440a328 | 4107 | else |
0c77715b | 4108 | nc->set_int(NULL, val); |
e440a328 | 4109 | |
0c77715b | 4110 | mpz_clear(uval); |
4111 | mpz_clear(val); | |
e440a328 | 4112 | |
af7a5274 | 4113 | if (!nc->set_type(unc->type(), true, location)) |
4114 | { | |
4115 | *issued_error = true; | |
4116 | return false; | |
4117 | } | |
4118 | return true; | |
e440a328 | 4119 | } |
4120 | ||
0c77715b | 4121 | // Return the integral constant value of a unary expression, if it has one. |
e440a328 | 4122 | |
4123 | bool | |
0c77715b | 4124 | Unary_expression::do_numeric_constant_value(Numeric_constant* nc) const |
e440a328 | 4125 | { |
0c77715b | 4126 | Numeric_constant unc; |
4127 | if (!this->expr_->numeric_constant_value(&unc)) | |
4128 | return false; | |
af7a5274 | 4129 | bool issued_error; |
0c77715b | 4130 | return Unary_expression::eval_constant(this->op_, &unc, this->location(), |
af7a5274 | 4131 | nc, &issued_error); |
e440a328 | 4132 | } |
4133 | ||
4134 | // Return the type of a unary expression. | |
4135 | ||
4136 | Type* | |
4137 | Unary_expression::do_type() | |
4138 | { | |
4139 | switch (this->op_) | |
4140 | { | |
4141 | case OPERATOR_PLUS: | |
4142 | case OPERATOR_MINUS: | |
4143 | case OPERATOR_NOT: | |
4144 | case OPERATOR_XOR: | |
4145 | return this->expr_->type(); | |
4146 | ||
4147 | case OPERATOR_AND: | |
4148 | return Type::make_pointer_type(this->expr_->type()); | |
4149 | ||
4150 | case OPERATOR_MULT: | |
4151 | { | |
4152 | Type* subtype = this->expr_->type(); | |
4153 | Type* points_to = subtype->points_to(); | |
4154 | if (points_to == NULL) | |
4155 | return Type::make_error_type(); | |
4156 | return points_to; | |
4157 | } | |
4158 | ||
4159 | default: | |
c3e6f413 | 4160 | go_unreachable(); |
e440a328 | 4161 | } |
4162 | } | |
4163 | ||
4164 | // Determine abstract types for a unary expression. | |
4165 | ||
4166 | void | |
4167 | Unary_expression::do_determine_type(const Type_context* context) | |
4168 | { | |
4169 | switch (this->op_) | |
4170 | { | |
4171 | case OPERATOR_PLUS: | |
4172 | case OPERATOR_MINUS: | |
4173 | case OPERATOR_NOT: | |
4174 | case OPERATOR_XOR: | |
4175 | this->expr_->determine_type(context); | |
4176 | break; | |
4177 | ||
4178 | case OPERATOR_AND: | |
4179 | // Taking the address of something. | |
4180 | { | |
4181 | Type* subtype = (context->type == NULL | |
4182 | ? NULL | |
4183 | : context->type->points_to()); | |
4184 | Type_context subcontext(subtype, false); | |
4185 | this->expr_->determine_type(&subcontext); | |
4186 | } | |
4187 | break; | |
4188 | ||
4189 | case OPERATOR_MULT: | |
4190 | // Indirecting through a pointer. | |
4191 | { | |
4192 | Type* subtype = (context->type == NULL | |
4193 | ? NULL | |
4194 | : Type::make_pointer_type(context->type)); | |
4195 | Type_context subcontext(subtype, false); | |
4196 | this->expr_->determine_type(&subcontext); | |
4197 | } | |
4198 | break; | |
4199 | ||
4200 | default: | |
c3e6f413 | 4201 | go_unreachable(); |
e440a328 | 4202 | } |
4203 | } | |
4204 | ||
4205 | // Check types for a unary expression. | |
4206 | ||
4207 | void | |
4208 | Unary_expression::do_check_types(Gogo*) | |
4209 | { | |
9fe897ef | 4210 | Type* type = this->expr_->type(); |
5c13bd80 | 4211 | if (type->is_error()) |
9fe897ef | 4212 | { |
4213 | this->set_is_error(); | |
4214 | return; | |
4215 | } | |
4216 | ||
e440a328 | 4217 | switch (this->op_) |
4218 | { | |
4219 | case OPERATOR_PLUS: | |
4220 | case OPERATOR_MINUS: | |
9fe897ef | 4221 | if (type->integer_type() == NULL |
4222 | && type->float_type() == NULL | |
4223 | && type->complex_type() == NULL) | |
4224 | this->report_error(_("expected numeric type")); | |
e440a328 | 4225 | break; |
4226 | ||
4227 | case OPERATOR_NOT: | |
59a401fe | 4228 | if (!type->is_boolean_type()) |
4229 | this->report_error(_("expected boolean type")); | |
4230 | break; | |
4231 | ||
e440a328 | 4232 | case OPERATOR_XOR: |
b3b1474e | 4233 | if (type->integer_type() == NULL) |
4234 | this->report_error(_("expected integer")); | |
e440a328 | 4235 | break; |
4236 | ||
4237 | case OPERATOR_AND: | |
4238 | if (!this->expr_->is_addressable()) | |
09ea332d | 4239 | { |
4240 | if (!this->create_temp_) | |
f4dea966 | 4241 | { |
631d5788 | 4242 | go_error_at(this->location(), "invalid operand for unary %<&%>"); |
f4dea966 | 4243 | this->set_is_error(); |
4244 | } | |
09ea332d | 4245 | } |
e440a328 | 4246 | else |
da244e59 | 4247 | this->expr_->issue_nil_check(); |
e440a328 | 4248 | break; |
4249 | ||
4250 | case OPERATOR_MULT: | |
4251 | // Indirecting through a pointer. | |
9fe897ef | 4252 | if (type->points_to() == NULL) |
4253 | this->report_error(_("expected pointer")); | |
7661d702 | 4254 | if (type->points_to()->is_error()) |
4255 | this->set_is_error(); | |
e440a328 | 4256 | break; |
4257 | ||
4258 | default: | |
c3e6f413 | 4259 | go_unreachable(); |
e440a328 | 4260 | } |
4261 | } | |
4262 | ||
ea664253 | 4263 | // Get the backend representation for a unary expression. |
e440a328 | 4264 | |
ea664253 | 4265 | Bexpression* |
4266 | Unary_expression::do_get_backend(Translate_context* context) | |
e440a328 | 4267 | { |
1b1f2abf | 4268 | Gogo* gogo = context->gogo(); |
e9d3367e | 4269 | Location loc = this->location(); |
4270 | ||
4271 | // Taking the address of a set-and-use-temporary expression requires | |
4272 | // setting the temporary and then taking the address. | |
4273 | if (this->op_ == OPERATOR_AND) | |
4274 | { | |
4275 | Set_and_use_temporary_expression* sut = | |
4276 | this->expr_->set_and_use_temporary_expression(); | |
4277 | if (sut != NULL) | |
4278 | { | |
4279 | Temporary_statement* temp = sut->temporary(); | |
4280 | Bvariable* bvar = temp->get_backend_variable(context); | |
d4e6573e | 4281 | Bexpression* bvar_expr = |
4282 | gogo->backend()->var_expression(bvar, VE_lvalue, loc); | |
ea664253 | 4283 | Bexpression* bval = sut->expression()->get_backend(context); |
f9ca30f9 | 4284 | |
0ab48656 | 4285 | Named_object* fn = context->function(); |
4286 | go_assert(fn != NULL); | |
4287 | Bfunction* bfn = | |
4288 | fn->func_value()->get_or_make_decl(gogo, fn); | |
f9ca30f9 | 4289 | Bstatement* bassign = |
0ab48656 | 4290 | gogo->backend()->assignment_statement(bfn, bvar_expr, bval, loc); |
f9ca30f9 | 4291 | Bexpression* bvar_addr = |
4292 | gogo->backend()->address_expression(bvar_expr, loc); | |
ea664253 | 4293 | return gogo->backend()->compound_expression(bassign, bvar_addr, loc); |
e9d3367e | 4294 | } |
4295 | } | |
4296 | ||
f9ca30f9 | 4297 | Bexpression* ret; |
ea664253 | 4298 | Bexpression* bexpr = this->expr_->get_backend(context); |
f9ca30f9 | 4299 | Btype* btype = this->expr_->type()->get_backend(gogo); |
e440a328 | 4300 | switch (this->op_) |
4301 | { | |
4302 | case OPERATOR_PLUS: | |
f9ca30f9 | 4303 | ret = bexpr; |
4304 | break; | |
e440a328 | 4305 | |
4306 | case OPERATOR_MINUS: | |
f9ca30f9 | 4307 | ret = gogo->backend()->unary_expression(this->op_, bexpr, loc); |
4308 | ret = gogo->backend()->convert_expression(btype, ret, loc); | |
4309 | break; | |
e440a328 | 4310 | |
4311 | case OPERATOR_NOT: | |
e440a328 | 4312 | case OPERATOR_XOR: |
f9ca30f9 | 4313 | ret = gogo->backend()->unary_expression(this->op_, bexpr, loc); |
4314 | break; | |
e440a328 | 4315 | |
4316 | case OPERATOR_AND: | |
09ea332d | 4317 | if (!this->create_temp_) |
4318 | { | |
4319 | // We should not see a non-constant constructor here; cases | |
4320 | // where we would see one should have been moved onto the | |
4321 | // heap at parse time. Taking the address of a nonconstant | |
4322 | // constructor will not do what the programmer expects. | |
f9ca30f9 | 4323 | |
4324 | go_assert(!this->expr_->is_composite_literal() | |
3ae06f68 | 4325 | || this->expr_->is_static_initializer()); |
24060bf9 | 4326 | if (this->expr_->classification() == EXPRESSION_UNARY) |
4327 | { | |
4328 | Unary_expression* ue = | |
4329 | static_cast<Unary_expression*>(this->expr_); | |
4330 | go_assert(ue->op() != OPERATOR_AND); | |
4331 | } | |
09ea332d | 4332 | } |
e440a328 | 4333 | |
f23d7786 | 4334 | static unsigned int counter; |
4335 | char buf[100]; | |
4336 | if (this->is_gc_root_ || this->is_slice_init_) | |
76f85fd6 | 4337 | { |
f23d7786 | 4338 | bool copy_to_heap = false; |
4339 | if (this->is_gc_root_) | |
4340 | { | |
4341 | // Build a decl for a GC root variable. GC roots are mutable, so | |
4342 | // they cannot be represented as an immutable_struct in the | |
4343 | // backend. | |
4344 | static unsigned int root_counter; | |
4345 | snprintf(buf, sizeof buf, "gc%u", root_counter); | |
4346 | ++root_counter; | |
4347 | } | |
4348 | else | |
4349 | { | |
4350 | // Build a decl for a slice value initializer. An immutable slice | |
4351 | // value initializer may have to be copied to the heap if it | |
4352 | // contains pointers in a non-constant context. | |
4353 | snprintf(buf, sizeof buf, "C%u", counter); | |
4354 | ++counter; | |
4355 | ||
4356 | Array_type* at = this->expr_->type()->array_type(); | |
4357 | go_assert(at != NULL); | |
4358 | ||
4359 | // If we are not copying the value to the heap, we will only | |
4360 | // initialize the value once, so we can use this directly | |
4361 | // rather than copying it. In that case we can't make it | |
4362 | // read-only, because the program is permitted to change it. | |
3ae06f68 | 4363 | copy_to_heap = context->function() != NULL; |
f23d7786 | 4364 | } |
438b4bec | 4365 | std::string asm_name(go_selectively_encode_id(buf)); |
f23d7786 | 4366 | Bvariable* implicit = |
438b4bec | 4367 | gogo->backend()->implicit_variable(buf, asm_name, |
4368 | btype, true, copy_to_heap, | |
4369 | false, 0); | |
aa5ae575 | 4370 | gogo->backend()->implicit_variable_set_init(implicit, buf, btype, |
4371 | true, copy_to_heap, false, | |
4372 | bexpr); | |
d4e6573e | 4373 | bexpr = gogo->backend()->var_expression(implicit, VE_lvalue, loc); |
1b4fb1e0 | 4374 | |
4375 | // If we are not copying a slice initializer to the heap, | |
4376 | // then it can be changed by the program, so if it can | |
4377 | // contain pointers we must register it as a GC root. | |
4378 | if (this->is_slice_init_ | |
4379 | && !copy_to_heap | |
4380 | && this->expr_->type()->has_pointer()) | |
4381 | { | |
4382 | Bexpression* root = | |
d4e6573e | 4383 | gogo->backend()->var_expression(implicit, VE_lvalue, loc); |
1b4fb1e0 | 4384 | root = gogo->backend()->address_expression(root, loc); |
4385 | Type* type = Type::make_pointer_type(this->expr_->type()); | |
4386 | gogo->add_gc_root(Expression::make_backend(root, type, loc)); | |
4387 | } | |
76f85fd6 | 4388 | } |
4389 | else if ((this->expr_->is_composite_literal() | |
3ae06f68 | 4390 | || this->expr_->string_expression() != NULL) |
4391 | && this->expr_->is_static_initializer()) | |
f9ca30f9 | 4392 | { |
76f85fd6 | 4393 | // Build a decl for a constant constructor. |
f9ca30f9 | 4394 | snprintf(buf, sizeof buf, "C%u", counter); |
4395 | ++counter; | |
4396 | ||
438b4bec | 4397 | std::string asm_name(go_selectively_encode_id(buf)); |
f9ca30f9 | 4398 | Bvariable* decl = |
438b4bec | 4399 | gogo->backend()->immutable_struct(buf, asm_name, |
4400 | true, false, btype, loc); | |
f9ca30f9 | 4401 | gogo->backend()->immutable_struct_set_init(decl, buf, true, false, |
4402 | btype, loc, bexpr); | |
d4e6573e | 4403 | bexpr = gogo->backend()->var_expression(decl, VE_lvalue, loc); |
f9ca30f9 | 4404 | } |
09ea332d | 4405 | |
f9ca30f9 | 4406 | go_assert(!this->create_temp_ || this->expr_->is_variable()); |
4407 | ret = gogo->backend()->address_expression(bexpr, loc); | |
4408 | break; | |
e440a328 | 4409 | |
4410 | case OPERATOR_MULT: | |
4411 | { | |
f9ca30f9 | 4412 | go_assert(this->expr_->type()->points_to() != NULL); |
e440a328 | 4413 | |
4414 | // If we are dereferencing the pointer to a large struct, we | |
4415 | // need to check for nil. We don't bother to check for small | |
4416 | // structs because we expect the system to crash on a nil | |
56080003 | 4417 | // pointer dereference. However, if we know the address of this |
4418 | // expression is being taken, we must always check for nil. | |
f9ca30f9 | 4419 | |
4420 | Type* ptype = this->expr_->type()->points_to(); | |
4421 | Btype* pbtype = ptype->get_backend(gogo); | |
4422 | if (!ptype->is_void_type()) | |
e440a328 | 4423 | { |
2a305b85 | 4424 | int64_t s; |
4425 | bool ok = ptype->backend_type_size(gogo, &s); | |
4426 | if (!ok) | |
4427 | { | |
4428 | go_assert(saw_errors()); | |
4429 | return gogo->backend()->error_expression(); | |
4430 | } | |
f9ca30f9 | 4431 | if (s >= 4096 || this->issue_nil_check_) |
19b4f09b | 4432 | { |
f9ca30f9 | 4433 | go_assert(this->expr_->is_variable()); |
ea664253 | 4434 | Bexpression* nil = |
4435 | Expression::make_nil(loc)->get_backend(context); | |
f9ca30f9 | 4436 | Bexpression* compare = |
4437 | gogo->backend()->binary_expression(OPERATOR_EQEQ, bexpr, | |
4438 | nil, loc); | |
f9ca30f9 | 4439 | Bexpression* crash = |
ea664253 | 4440 | gogo->runtime_error(RUNTIME_ERROR_NIL_DEREFERENCE, |
4441 | loc)->get_backend(context); | |
93715b75 | 4442 | Bfunction* bfn = context->function()->func_value()->get_decl(); |
4443 | bexpr = gogo->backend()->conditional_expression(bfn, btype, | |
4444 | compare, | |
f9ca30f9 | 4445 | crash, bexpr, |
4446 | loc); | |
4447 | ||
19b4f09b | 4448 | } |
e440a328 | 4449 | } |
9b27b43c | 4450 | ret = gogo->backend()->indirect_expression(pbtype, bexpr, false, loc); |
e440a328 | 4451 | } |
f9ca30f9 | 4452 | break; |
e440a328 | 4453 | |
4454 | default: | |
c3e6f413 | 4455 | go_unreachable(); |
e440a328 | 4456 | } |
f9ca30f9 | 4457 | |
ea664253 | 4458 | return ret; |
e440a328 | 4459 | } |
4460 | ||
4461 | // Export a unary expression. | |
4462 | ||
4463 | void | |
4464 | Unary_expression::do_export(Export* exp) const | |
4465 | { | |
4466 | switch (this->op_) | |
4467 | { | |
4468 | case OPERATOR_PLUS: | |
4469 | exp->write_c_string("+ "); | |
4470 | break; | |
4471 | case OPERATOR_MINUS: | |
4472 | exp->write_c_string("- "); | |
4473 | break; | |
4474 | case OPERATOR_NOT: | |
4475 | exp->write_c_string("! "); | |
4476 | break; | |
4477 | case OPERATOR_XOR: | |
4478 | exp->write_c_string("^ "); | |
4479 | break; | |
4480 | case OPERATOR_AND: | |
4481 | case OPERATOR_MULT: | |
4482 | default: | |
c3e6f413 | 4483 | go_unreachable(); |
e440a328 | 4484 | } |
4485 | this->expr_->export_expression(exp); | |
4486 | } | |
4487 | ||
4488 | // Import a unary expression. | |
4489 | ||
4490 | Expression* | |
4491 | Unary_expression::do_import(Import* imp) | |
4492 | { | |
4493 | Operator op; | |
4494 | switch (imp->get_char()) | |
4495 | { | |
4496 | case '+': | |
4497 | op = OPERATOR_PLUS; | |
4498 | break; | |
4499 | case '-': | |
4500 | op = OPERATOR_MINUS; | |
4501 | break; | |
4502 | case '!': | |
4503 | op = OPERATOR_NOT; | |
4504 | break; | |
4505 | case '^': | |
4506 | op = OPERATOR_XOR; | |
4507 | break; | |
4508 | default: | |
c3e6f413 | 4509 | go_unreachable(); |
e440a328 | 4510 | } |
4511 | imp->require_c_string(" "); | |
4512 | Expression* expr = Expression::import_expression(imp); | |
4513 | return Expression::make_unary(op, expr, imp->location()); | |
4514 | } | |
4515 | ||
d751bb78 | 4516 | // Dump ast representation of an unary expression. |
4517 | ||
4518 | void | |
4519 | Unary_expression::do_dump_expression(Ast_dump_context* ast_dump_context) const | |
4520 | { | |
4521 | ast_dump_context->dump_operator(this->op_); | |
4522 | ast_dump_context->ostream() << "("; | |
4523 | ast_dump_context->dump_expression(this->expr_); | |
4524 | ast_dump_context->ostream() << ") "; | |
4525 | } | |
4526 | ||
e440a328 | 4527 | // Make a unary expression. |
4528 | ||
4529 | Expression* | |
b13c66cd | 4530 | Expression::make_unary(Operator op, Expression* expr, Location location) |
e440a328 | 4531 | { |
4532 | return new Unary_expression(op, expr, location); | |
4533 | } | |
4534 | ||
4535 | // If this is an indirection through a pointer, return the expression | |
4536 | // being pointed through. Otherwise return this. | |
4537 | ||
4538 | Expression* | |
4539 | Expression::deref() | |
4540 | { | |
4541 | if (this->classification_ == EXPRESSION_UNARY) | |
4542 | { | |
4543 | Unary_expression* ue = static_cast<Unary_expression*>(this); | |
4544 | if (ue->op() == OPERATOR_MULT) | |
4545 | return ue->operand(); | |
4546 | } | |
4547 | return this; | |
4548 | } | |
4549 | ||
4550 | // Class Binary_expression. | |
4551 | ||
4552 | // Traversal. | |
4553 | ||
4554 | int | |
4555 | Binary_expression::do_traverse(Traverse* traverse) | |
4556 | { | |
4557 | int t = Expression::traverse(&this->left_, traverse); | |
4558 | if (t == TRAVERSE_EXIT) | |
4559 | return TRAVERSE_EXIT; | |
4560 | return Expression::traverse(&this->right_, traverse); | |
4561 | } | |
4562 | ||
3ae06f68 | 4563 | // Return whether this expression may be used as a static initializer. |
4564 | ||
4565 | bool | |
4566 | Binary_expression::do_is_static_initializer() const | |
4567 | { | |
4568 | if (!this->left_->is_static_initializer() | |
4569 | || !this->right_->is_static_initializer()) | |
4570 | return false; | |
4571 | ||
4572 | // Addresses can be static initializers, but we can't implement | |
4573 | // arbitray binary expressions of them. | |
4574 | Unary_expression* lu = this->left_->unary_expression(); | |
4575 | Unary_expression* ru = this->right_->unary_expression(); | |
4576 | if (lu != NULL && lu->op() == OPERATOR_AND) | |
4577 | { | |
4578 | if (ru != NULL && ru->op() == OPERATOR_AND) | |
4579 | return this->op_ == OPERATOR_MINUS; | |
4580 | else | |
4581 | return this->op_ == OPERATOR_PLUS || this->op_ == OPERATOR_MINUS; | |
4582 | } | |
4583 | else if (ru != NULL && ru->op() == OPERATOR_AND) | |
4584 | return this->op_ == OPERATOR_PLUS || this->op_ == OPERATOR_MINUS; | |
4585 | ||
4586 | // Other cases should resolve in the backend. | |
4587 | return true; | |
4588 | } | |
4589 | ||
0c77715b | 4590 | // Return the type to use for a binary operation on operands of |
4591 | // LEFT_TYPE and RIGHT_TYPE. These are the types of constants and as | |
4592 | // such may be NULL or abstract. | |
4593 | ||
4594 | bool | |
4595 | Binary_expression::operation_type(Operator op, Type* left_type, | |
4596 | Type* right_type, Type** result_type) | |
4597 | { | |
4598 | if (left_type != right_type | |
4599 | && !left_type->is_abstract() | |
4600 | && !right_type->is_abstract() | |
4601 | && left_type->base() != right_type->base() | |
4602 | && op != OPERATOR_LSHIFT | |
4603 | && op != OPERATOR_RSHIFT) | |
4604 | { | |
4605 | // May be a type error--let it be diagnosed elsewhere. | |
4606 | return false; | |
4607 | } | |
4608 | ||
4609 | if (op == OPERATOR_LSHIFT || op == OPERATOR_RSHIFT) | |
4610 | { | |
4611 | if (left_type->integer_type() != NULL) | |
4612 | *result_type = left_type; | |
4613 | else | |
4614 | *result_type = Type::make_abstract_integer_type(); | |
4615 | } | |
4616 | else if (!left_type->is_abstract() && left_type->named_type() != NULL) | |
4617 | *result_type = left_type; | |
4618 | else if (!right_type->is_abstract() && right_type->named_type() != NULL) | |
4619 | *result_type = right_type; | |
4620 | else if (!left_type->is_abstract()) | |
4621 | *result_type = left_type; | |
4622 | else if (!right_type->is_abstract()) | |
4623 | *result_type = right_type; | |
4624 | else if (left_type->complex_type() != NULL) | |
4625 | *result_type = left_type; | |
4626 | else if (right_type->complex_type() != NULL) | |
4627 | *result_type = right_type; | |
4628 | else if (left_type->float_type() != NULL) | |
4629 | *result_type = left_type; | |
4630 | else if (right_type->float_type() != NULL) | |
4631 | *result_type = right_type; | |
4632 | else if (left_type->integer_type() != NULL | |
4633 | && left_type->integer_type()->is_rune()) | |
4634 | *result_type = left_type; | |
4635 | else if (right_type->integer_type() != NULL | |
4636 | && right_type->integer_type()->is_rune()) | |
4637 | *result_type = right_type; | |
4638 | else | |
4639 | *result_type = left_type; | |
4640 | ||
4641 | return true; | |
4642 | } | |
4643 | ||
4644 | // Convert an integer comparison code and an operator to a boolean | |
4645 | // value. | |
e440a328 | 4646 | |
4647 | bool | |
0c77715b | 4648 | Binary_expression::cmp_to_bool(Operator op, int cmp) |
e440a328 | 4649 | { |
e440a328 | 4650 | switch (op) |
4651 | { | |
4652 | case OPERATOR_EQEQ: | |
0c77715b | 4653 | return cmp == 0; |
4654 | break; | |
e440a328 | 4655 | case OPERATOR_NOTEQ: |
0c77715b | 4656 | return cmp != 0; |
4657 | break; | |
e440a328 | 4658 | case OPERATOR_LT: |
0c77715b | 4659 | return cmp < 0; |
4660 | break; | |
e440a328 | 4661 | case OPERATOR_LE: |
0c77715b | 4662 | return cmp <= 0; |
e440a328 | 4663 | case OPERATOR_GT: |
0c77715b | 4664 | return cmp > 0; |
e440a328 | 4665 | case OPERATOR_GE: |
0c77715b | 4666 | return cmp >= 0; |
e440a328 | 4667 | default: |
c3e6f413 | 4668 | go_unreachable(); |
e440a328 | 4669 | } |
4670 | } | |
4671 | ||
0c77715b | 4672 | // Compare constants according to OP. |
e440a328 | 4673 | |
4674 | bool | |
0c77715b | 4675 | Binary_expression::compare_constant(Operator op, Numeric_constant* left_nc, |
4676 | Numeric_constant* right_nc, | |
4677 | Location location, bool* result) | |
e440a328 | 4678 | { |
0c77715b | 4679 | Type* left_type = left_nc->type(); |
4680 | Type* right_type = right_nc->type(); | |
4681 | ||
4682 | Type* type; | |
4683 | if (!Binary_expression::operation_type(op, left_type, right_type, &type)) | |
4684 | return false; | |
4685 | ||
4686 | // When comparing an untyped operand to a typed operand, we are | |
4687 | // effectively coercing the untyped operand to the other operand's | |
4688 | // type, so make sure that is valid. | |
4689 | if (!left_nc->set_type(type, true, location) | |
4690 | || !right_nc->set_type(type, true, location)) | |
4691 | return false; | |
4692 | ||
4693 | bool ret; | |
4694 | int cmp; | |
4695 | if (type->complex_type() != NULL) | |
4696 | { | |
4697 | if (op != OPERATOR_EQEQ && op != OPERATOR_NOTEQ) | |
4698 | return false; | |
4699 | ret = Binary_expression::compare_complex(left_nc, right_nc, &cmp); | |
4700 | } | |
4701 | else if (type->float_type() != NULL) | |
4702 | ret = Binary_expression::compare_float(left_nc, right_nc, &cmp); | |
e440a328 | 4703 | else |
0c77715b | 4704 | ret = Binary_expression::compare_integer(left_nc, right_nc, &cmp); |
4705 | ||
4706 | if (ret) | |
4707 | *result = Binary_expression::cmp_to_bool(op, cmp); | |
4708 | ||
4709 | return ret; | |
4710 | } | |
4711 | ||
4712 | // Compare integer constants. | |
4713 | ||
4714 | bool | |
4715 | Binary_expression::compare_integer(const Numeric_constant* left_nc, | |
4716 | const Numeric_constant* right_nc, | |
4717 | int* cmp) | |
4718 | { | |
4719 | mpz_t left_val; | |
4720 | if (!left_nc->to_int(&left_val)) | |
4721 | return false; | |
4722 | mpz_t right_val; | |
4723 | if (!right_nc->to_int(&right_val)) | |
e440a328 | 4724 | { |
0c77715b | 4725 | mpz_clear(left_val); |
4726 | return false; | |
e440a328 | 4727 | } |
0c77715b | 4728 | |
4729 | *cmp = mpz_cmp(left_val, right_val); | |
4730 | ||
4731 | mpz_clear(left_val); | |
4732 | mpz_clear(right_val); | |
4733 | ||
4734 | return true; | |
4735 | } | |
4736 | ||
4737 | // Compare floating point constants. | |
4738 | ||
4739 | bool | |
4740 | Binary_expression::compare_float(const Numeric_constant* left_nc, | |
4741 | const Numeric_constant* right_nc, | |
4742 | int* cmp) | |
4743 | { | |
4744 | mpfr_t left_val; | |
4745 | if (!left_nc->to_float(&left_val)) | |
4746 | return false; | |
4747 | mpfr_t right_val; | |
4748 | if (!right_nc->to_float(&right_val)) | |
e440a328 | 4749 | { |
0c77715b | 4750 | mpfr_clear(left_val); |
4751 | return false; | |
4752 | } | |
4753 | ||
4754 | // We already coerced both operands to the same type. If that type | |
4755 | // is not an abstract type, we need to round the values accordingly. | |
4756 | Type* type = left_nc->type(); | |
4757 | if (!type->is_abstract() && type->float_type() != NULL) | |
4758 | { | |
4759 | int bits = type->float_type()->bits(); | |
4760 | mpfr_prec_round(left_val, bits, GMP_RNDN); | |
4761 | mpfr_prec_round(right_val, bits, GMP_RNDN); | |
e440a328 | 4762 | } |
0c77715b | 4763 | |
4764 | *cmp = mpfr_cmp(left_val, right_val); | |
4765 | ||
4766 | mpfr_clear(left_val); | |
4767 | mpfr_clear(right_val); | |
4768 | ||
4769 | return true; | |
e440a328 | 4770 | } |
4771 | ||
0c77715b | 4772 | // Compare complex constants. Complex numbers may only be compared |
4773 | // for equality. | |
e440a328 | 4774 | |
4775 | bool | |
0c77715b | 4776 | Binary_expression::compare_complex(const Numeric_constant* left_nc, |
4777 | const Numeric_constant* right_nc, | |
4778 | int* cmp) | |
e440a328 | 4779 | { |
fcbea5e4 | 4780 | mpc_t left_val; |
4781 | if (!left_nc->to_complex(&left_val)) | |
0c77715b | 4782 | return false; |
fcbea5e4 | 4783 | mpc_t right_val; |
4784 | if (!right_nc->to_complex(&right_val)) | |
e440a328 | 4785 | { |
fcbea5e4 | 4786 | mpc_clear(left_val); |
0c77715b | 4787 | return false; |
e440a328 | 4788 | } |
0c77715b | 4789 | |
4790 | // We already coerced both operands to the same type. If that type | |
4791 | // is not an abstract type, we need to round the values accordingly. | |
4792 | Type* type = left_nc->type(); | |
4793 | if (!type->is_abstract() && type->complex_type() != NULL) | |
e440a328 | 4794 | { |
0c77715b | 4795 | int bits = type->complex_type()->bits(); |
fcbea5e4 | 4796 | mpfr_prec_round(mpc_realref(left_val), bits / 2, GMP_RNDN); |
4797 | mpfr_prec_round(mpc_imagref(left_val), bits / 2, GMP_RNDN); | |
4798 | mpfr_prec_round(mpc_realref(right_val), bits / 2, GMP_RNDN); | |
4799 | mpfr_prec_round(mpc_imagref(right_val), bits / 2, GMP_RNDN); | |
e440a328 | 4800 | } |
0c77715b | 4801 | |
fcbea5e4 | 4802 | *cmp = mpc_cmp(left_val, right_val) != 0; |
0c77715b | 4803 | |
fcbea5e4 | 4804 | mpc_clear(left_val); |
4805 | mpc_clear(right_val); | |
0c77715b | 4806 | |
4807 | return true; | |
e440a328 | 4808 | } |
4809 | ||
0c77715b | 4810 | // Apply binary opcode OP to LEFT_NC and RIGHT_NC, setting NC. Return |
4811 | // true if this could be done, false if not. Issue errors at LOCATION | |
af7a5274 | 4812 | // as appropriate, and sets *ISSUED_ERROR if it did. |
e440a328 | 4813 | |
4814 | bool | |
0c77715b | 4815 | Binary_expression::eval_constant(Operator op, Numeric_constant* left_nc, |
4816 | Numeric_constant* right_nc, | |
af7a5274 | 4817 | Location location, Numeric_constant* nc, |
4818 | bool* issued_error) | |
e440a328 | 4819 | { |
af7a5274 | 4820 | *issued_error = false; |
e440a328 | 4821 | switch (op) |
4822 | { | |
4823 | case OPERATOR_OROR: | |
4824 | case OPERATOR_ANDAND: | |
4825 | case OPERATOR_EQEQ: | |
4826 | case OPERATOR_NOTEQ: | |
4827 | case OPERATOR_LT: | |
4828 | case OPERATOR_LE: | |
4829 | case OPERATOR_GT: | |
4830 | case OPERATOR_GE: | |
9767e2d3 | 4831 | // These return boolean values, not numeric. |
4832 | return false; | |
0c77715b | 4833 | default: |
4834 | break; | |
4835 | } | |
4836 | ||
4837 | Type* left_type = left_nc->type(); | |
4838 | Type* right_type = right_nc->type(); | |
4839 | ||
4840 | Type* type; | |
4841 | if (!Binary_expression::operation_type(op, left_type, right_type, &type)) | |
4842 | return false; | |
4843 | ||
4844 | bool is_shift = op == OPERATOR_LSHIFT || op == OPERATOR_RSHIFT; | |
4845 | ||
4846 | // When combining an untyped operand with a typed operand, we are | |
4847 | // effectively coercing the untyped operand to the other operand's | |
4848 | // type, so make sure that is valid. | |
4849 | if (!left_nc->set_type(type, true, location)) | |
4850 | return false; | |
4851 | if (!is_shift && !right_nc->set_type(type, true, location)) | |
4852 | return false; | |
85334a21 | 4853 | if (is_shift |
4854 | && ((left_type->integer_type() == NULL | |
4855 | && !left_type->is_abstract()) | |
4856 | || (right_type->integer_type() == NULL | |
4857 | && !right_type->is_abstract()))) | |
4858 | return false; | |
0c77715b | 4859 | |
4860 | bool r; | |
4861 | if (type->complex_type() != NULL) | |
4862 | r = Binary_expression::eval_complex(op, left_nc, right_nc, location, nc); | |
4863 | else if (type->float_type() != NULL) | |
4864 | r = Binary_expression::eval_float(op, left_nc, right_nc, location, nc); | |
4865 | else | |
4866 | r = Binary_expression::eval_integer(op, left_nc, right_nc, location, nc); | |
4867 | ||
4868 | if (r) | |
af7a5274 | 4869 | { |
4870 | r = nc->set_type(type, true, location); | |
4871 | if (!r) | |
4872 | *issued_error = true; | |
4873 | } | |
0c77715b | 4874 | |
4875 | return r; | |
4876 | } | |
4877 | ||
4878 | // Apply binary opcode OP to LEFT_NC and RIGHT_NC, setting NC, using | |
4879 | // integer operations. Return true if this could be done, false if | |
4880 | // not. | |
4881 | ||
4882 | bool | |
4883 | Binary_expression::eval_integer(Operator op, const Numeric_constant* left_nc, | |
4884 | const Numeric_constant* right_nc, | |
4885 | Location location, Numeric_constant* nc) | |
4886 | { | |
4887 | mpz_t left_val; | |
4888 | if (!left_nc->to_int(&left_val)) | |
4889 | return false; | |
4890 | mpz_t right_val; | |
4891 | if (!right_nc->to_int(&right_val)) | |
4892 | { | |
4893 | mpz_clear(left_val); | |
e440a328 | 4894 | return false; |
0c77715b | 4895 | } |
4896 | ||
4897 | mpz_t val; | |
4898 | mpz_init(val); | |
4899 | ||
4900 | switch (op) | |
4901 | { | |
e440a328 | 4902 | case OPERATOR_PLUS: |
4903 | mpz_add(val, left_val, right_val); | |
2c809f8f | 4904 | if (mpz_sizeinbase(val, 2) > 0x100000) |
4905 | { | |
631d5788 | 4906 | go_error_at(location, "constant addition overflow"); |
71a45216 | 4907 | nc->set_invalid(); |
2c809f8f | 4908 | mpz_set_ui(val, 1); |
4909 | } | |
e440a328 | 4910 | break; |
4911 | case OPERATOR_MINUS: | |
4912 | mpz_sub(val, left_val, right_val); | |
2c809f8f | 4913 | if (mpz_sizeinbase(val, 2) > 0x100000) |
4914 | { | |
631d5788 | 4915 | go_error_at(location, "constant subtraction overflow"); |
71a45216 | 4916 | nc->set_invalid(); |
2c809f8f | 4917 | mpz_set_ui(val, 1); |
4918 | } | |
e440a328 | 4919 | break; |
4920 | case OPERATOR_OR: | |
4921 | mpz_ior(val, left_val, right_val); | |
4922 | break; | |
4923 | case OPERATOR_XOR: | |
4924 | mpz_xor(val, left_val, right_val); | |
4925 | break; | |
4926 | case OPERATOR_MULT: | |
4927 | mpz_mul(val, left_val, right_val); | |
2c809f8f | 4928 | if (mpz_sizeinbase(val, 2) > 0x100000) |
4929 | { | |
631d5788 | 4930 | go_error_at(location, "constant multiplication overflow"); |
71a45216 | 4931 | nc->set_invalid(); |
2c809f8f | 4932 | mpz_set_ui(val, 1); |
4933 | } | |
e440a328 | 4934 | break; |
4935 | case OPERATOR_DIV: | |
4936 | if (mpz_sgn(right_val) != 0) | |
4937 | mpz_tdiv_q(val, left_val, right_val); | |
4938 | else | |
4939 | { | |
631d5788 | 4940 | go_error_at(location, "division by zero"); |
71a45216 | 4941 | nc->set_invalid(); |
e440a328 | 4942 | mpz_set_ui(val, 0); |
e440a328 | 4943 | } |
4944 | break; | |
4945 | case OPERATOR_MOD: | |
4946 | if (mpz_sgn(right_val) != 0) | |
4947 | mpz_tdiv_r(val, left_val, right_val); | |
4948 | else | |
4949 | { | |
631d5788 | 4950 | go_error_at(location, "division by zero"); |
71a45216 | 4951 | nc->set_invalid(); |
e440a328 | 4952 | mpz_set_ui(val, 0); |
e440a328 | 4953 | } |
4954 | break; | |
4955 | case OPERATOR_LSHIFT: | |
4956 | { | |
4957 | unsigned long shift = mpz_get_ui(right_val); | |
0c77715b | 4958 | if (mpz_cmp_ui(right_val, shift) == 0 && shift <= 0x100000) |
4959 | mpz_mul_2exp(val, left_val, shift); | |
4960 | else | |
e440a328 | 4961 | { |
631d5788 | 4962 | go_error_at(location, "shift count overflow"); |
71a45216 | 4963 | nc->set_invalid(); |
2c809f8f | 4964 | mpz_set_ui(val, 1); |
e440a328 | 4965 | } |
e440a328 | 4966 | break; |
4967 | } | |
4968 | break; | |
4969 | case OPERATOR_RSHIFT: | |
4970 | { | |
4971 | unsigned long shift = mpz_get_ui(right_val); | |
4972 | if (mpz_cmp_ui(right_val, shift) != 0) | |
4973 | { | |
631d5788 | 4974 | go_error_at(location, "shift count overflow"); |
71a45216 | 4975 | nc->set_invalid(); |
2c809f8f | 4976 | mpz_set_ui(val, 1); |
e440a328 | 4977 | } |
e440a328 | 4978 | else |
0c77715b | 4979 | { |
4980 | if (mpz_cmp_ui(left_val, 0) >= 0) | |
4981 | mpz_tdiv_q_2exp(val, left_val, shift); | |
4982 | else | |
4983 | mpz_fdiv_q_2exp(val, left_val, shift); | |
4984 | } | |
e440a328 | 4985 | break; |
4986 | } | |
4987 | break; | |
4988 | case OPERATOR_AND: | |
4989 | mpz_and(val, left_val, right_val); | |
4990 | break; | |
4991 | case OPERATOR_BITCLEAR: | |
4992 | { | |
4993 | mpz_t tval; | |
4994 | mpz_init(tval); | |
4995 | mpz_com(tval, right_val); | |
4996 | mpz_and(val, left_val, tval); | |
4997 | mpz_clear(tval); | |
4998 | } | |
4999 | break; | |
5000 | default: | |
c3e6f413 | 5001 | go_unreachable(); |
e440a328 | 5002 | } |
5003 | ||
0c77715b | 5004 | mpz_clear(left_val); |
5005 | mpz_clear(right_val); | |
e440a328 | 5006 | |
0c77715b | 5007 | if (left_nc->is_rune() |
5008 | || (op != OPERATOR_LSHIFT | |
5009 | && op != OPERATOR_RSHIFT | |
5010 | && right_nc->is_rune())) | |
5011 | nc->set_rune(NULL, val); | |
5012 | else | |
5013 | nc->set_int(NULL, val); | |
5014 | ||
5015 | mpz_clear(val); | |
e440a328 | 5016 | |
5017 | return true; | |
5018 | } | |
5019 | ||
0c77715b | 5020 | // Apply binary opcode OP to LEFT_NC and RIGHT_NC, setting NC, using |
5021 | // floating point operations. Return true if this could be done, | |
5022 | // false if not. | |
e440a328 | 5023 | |
5024 | bool | |
0c77715b | 5025 | Binary_expression::eval_float(Operator op, const Numeric_constant* left_nc, |
5026 | const Numeric_constant* right_nc, | |
5027 | Location location, Numeric_constant* nc) | |
e440a328 | 5028 | { |
0c77715b | 5029 | mpfr_t left_val; |
5030 | if (!left_nc->to_float(&left_val)) | |
5031 | return false; | |
5032 | mpfr_t right_val; | |
5033 | if (!right_nc->to_float(&right_val)) | |
e440a328 | 5034 | { |
0c77715b | 5035 | mpfr_clear(left_val); |
e440a328 | 5036 | return false; |
0c77715b | 5037 | } |
5038 | ||
5039 | mpfr_t val; | |
5040 | mpfr_init(val); | |
5041 | ||
5042 | bool ret = true; | |
5043 | switch (op) | |
5044 | { | |
e440a328 | 5045 | case OPERATOR_PLUS: |
5046 | mpfr_add(val, left_val, right_val, GMP_RNDN); | |
5047 | break; | |
5048 | case OPERATOR_MINUS: | |
5049 | mpfr_sub(val, left_val, right_val, GMP_RNDN); | |
5050 | break; | |
5051 | case OPERATOR_OR: | |
5052 | case OPERATOR_XOR: | |
5053 | case OPERATOR_AND: | |
5054 | case OPERATOR_BITCLEAR: | |
0c77715b | 5055 | case OPERATOR_MOD: |
5056 | case OPERATOR_LSHIFT: | |
5057 | case OPERATOR_RSHIFT: | |
5058 | mpfr_set_ui(val, 0, GMP_RNDN); | |
5059 | ret = false; | |
5060 | break; | |
e440a328 | 5061 | case OPERATOR_MULT: |
5062 | mpfr_mul(val, left_val, right_val, GMP_RNDN); | |
5063 | break; | |
5064 | case OPERATOR_DIV: | |
0c77715b | 5065 | if (!mpfr_zero_p(right_val)) |
5066 | mpfr_div(val, left_val, right_val, GMP_RNDN); | |
5067 | else | |
5068 | { | |
631d5788 | 5069 | go_error_at(location, "division by zero"); |
71a45216 | 5070 | nc->set_invalid(); |
0c77715b | 5071 | mpfr_set_ui(val, 0, GMP_RNDN); |
5072 | } | |
e440a328 | 5073 | break; |
e440a328 | 5074 | default: |
c3e6f413 | 5075 | go_unreachable(); |
e440a328 | 5076 | } |
5077 | ||
0c77715b | 5078 | mpfr_clear(left_val); |
5079 | mpfr_clear(right_val); | |
e440a328 | 5080 | |
0c77715b | 5081 | nc->set_float(NULL, val); |
5082 | mpfr_clear(val); | |
e440a328 | 5083 | |
0c77715b | 5084 | return ret; |
e440a328 | 5085 | } |
5086 | ||
0c77715b | 5087 | // Apply binary opcode OP to LEFT_NC and RIGHT_NC, setting NC, using |
5088 | // complex operations. Return true if this could be done, false if | |
5089 | // not. | |
e440a328 | 5090 | |
5091 | bool | |
0c77715b | 5092 | Binary_expression::eval_complex(Operator op, const Numeric_constant* left_nc, |
5093 | const Numeric_constant* right_nc, | |
5094 | Location location, Numeric_constant* nc) | |
e440a328 | 5095 | { |
fcbea5e4 | 5096 | mpc_t left_val; |
5097 | if (!left_nc->to_complex(&left_val)) | |
0c77715b | 5098 | return false; |
fcbea5e4 | 5099 | mpc_t right_val; |
5100 | if (!right_nc->to_complex(&right_val)) | |
e440a328 | 5101 | { |
fcbea5e4 | 5102 | mpc_clear(left_val); |
e440a328 | 5103 | return false; |
0c77715b | 5104 | } |
5105 | ||
fcbea5e4 | 5106 | mpc_t val; |
5107 | mpc_init2(val, mpc_precision); | |
0c77715b | 5108 | |
5109 | bool ret = true; | |
5110 | switch (op) | |
5111 | { | |
e440a328 | 5112 | case OPERATOR_PLUS: |
fcbea5e4 | 5113 | mpc_add(val, left_val, right_val, MPC_RNDNN); |
e440a328 | 5114 | break; |
5115 | case OPERATOR_MINUS: | |
fcbea5e4 | 5116 | mpc_sub(val, left_val, right_val, MPC_RNDNN); |
e440a328 | 5117 | break; |
5118 | case OPERATOR_OR: | |
5119 | case OPERATOR_XOR: | |
5120 | case OPERATOR_AND: | |
5121 | case OPERATOR_BITCLEAR: | |
0c77715b | 5122 | case OPERATOR_MOD: |
5123 | case OPERATOR_LSHIFT: | |
5124 | case OPERATOR_RSHIFT: | |
fcbea5e4 | 5125 | mpc_set_ui(val, 0, MPC_RNDNN); |
0c77715b | 5126 | ret = false; |
5127 | break; | |
e440a328 | 5128 | case OPERATOR_MULT: |
fcbea5e4 | 5129 | mpc_mul(val, left_val, right_val, MPC_RNDNN); |
e440a328 | 5130 | break; |
5131 | case OPERATOR_DIV: | |
fcbea5e4 | 5132 | if (mpc_cmp_si(right_val, 0) == 0) |
5133 | { | |
631d5788 | 5134 | go_error_at(location, "division by zero"); |
71a45216 | 5135 | nc->set_invalid(); |
fcbea5e4 | 5136 | mpc_set_ui(val, 0, MPC_RNDNN); |
5137 | break; | |
5138 | } | |
5139 | mpc_div(val, left_val, right_val, MPC_RNDNN); | |
e440a328 | 5140 | break; |
e440a328 | 5141 | default: |
c3e6f413 | 5142 | go_unreachable(); |
e440a328 | 5143 | } |
5144 | ||
fcbea5e4 | 5145 | mpc_clear(left_val); |
5146 | mpc_clear(right_val); | |
e440a328 | 5147 | |
fcbea5e4 | 5148 | nc->set_complex(NULL, val); |
5149 | mpc_clear(val); | |
e440a328 | 5150 | |
0c77715b | 5151 | return ret; |
e440a328 | 5152 | } |
5153 | ||
5154 | // Lower a binary expression. We have to evaluate constant | |
5155 | // expressions now, in order to implement Go's unlimited precision | |
5156 | // constants. | |
5157 | ||
5158 | Expression* | |
e9d3367e | 5159 | Binary_expression::do_lower(Gogo* gogo, Named_object*, |
5160 | Statement_inserter* inserter, int) | |
e440a328 | 5161 | { |
b13c66cd | 5162 | Location location = this->location(); |
e440a328 | 5163 | Operator op = this->op_; |
5164 | Expression* left = this->left_; | |
5165 | Expression* right = this->right_; | |
5166 | ||
5167 | const bool is_comparison = (op == OPERATOR_EQEQ | |
5168 | || op == OPERATOR_NOTEQ | |
5169 | || op == OPERATOR_LT | |
5170 | || op == OPERATOR_LE | |
5171 | || op == OPERATOR_GT | |
5172 | || op == OPERATOR_GE); | |
5173 | ||
0c77715b | 5174 | // Numeric constant expressions. |
e440a328 | 5175 | { |
0c77715b | 5176 | Numeric_constant left_nc; |
5177 | Numeric_constant right_nc; | |
5178 | if (left->numeric_constant_value(&left_nc) | |
5179 | && right->numeric_constant_value(&right_nc)) | |
e440a328 | 5180 | { |
0c77715b | 5181 | if (is_comparison) |
e440a328 | 5182 | { |
0c77715b | 5183 | bool result; |
5184 | if (!Binary_expression::compare_constant(op, &left_nc, | |
5185 | &right_nc, location, | |
5186 | &result)) | |
5187 | return this; | |
e90c9dfc | 5188 | return Expression::make_cast(Type::make_boolean_type(), |
0c77715b | 5189 | Expression::make_boolean(result, |
5190 | location), | |
5191 | location); | |
e440a328 | 5192 | } |
5193 | else | |
5194 | { | |
0c77715b | 5195 | Numeric_constant nc; |
af7a5274 | 5196 | bool issued_error; |
0c77715b | 5197 | if (!Binary_expression::eval_constant(op, &left_nc, &right_nc, |
af7a5274 | 5198 | location, &nc, |
5199 | &issued_error)) | |
5200 | { | |
5201 | if (issued_error) | |
5202 | return Expression::make_error(location); | |
71a45216 | 5203 | return this; |
af7a5274 | 5204 | } |
0c77715b | 5205 | return nc.expression(location); |
e440a328 | 5206 | } |
5207 | } | |
e440a328 | 5208 | } |
5209 | ||
5210 | // String constant expressions. | |
315fa98d | 5211 | if (left->type()->is_string_type() && right->type()->is_string_type()) |
e440a328 | 5212 | { |
5213 | std::string left_string; | |
5214 | std::string right_string; | |
5215 | if (left->string_constant_value(&left_string) | |
5216 | && right->string_constant_value(&right_string)) | |
315fa98d | 5217 | { |
5218 | if (op == OPERATOR_PLUS) | |
5219 | return Expression::make_string(left_string + right_string, | |
5220 | location); | |
5221 | else if (is_comparison) | |
5222 | { | |
5223 | int cmp = left_string.compare(right_string); | |
0c77715b | 5224 | bool r = Binary_expression::cmp_to_bool(op, cmp); |
e90c9dfc | 5225 | return Expression::make_boolean(r, location); |
b40dc774 | 5226 | } |
5227 | } | |
b40dc774 | 5228 | } |
5229 | ||
ceeb12d7 | 5230 | // Lower struct, array, and some interface comparisons. |
e9d3367e | 5231 | if (op == OPERATOR_EQEQ || op == OPERATOR_NOTEQ) |
5232 | { | |
b79832ca | 5233 | if (left->type()->struct_type() != NULL |
5234 | && right->type()->struct_type() != NULL) | |
e9d3367e | 5235 | return this->lower_struct_comparison(gogo, inserter); |
5236 | else if (left->type()->array_type() != NULL | |
b79832ca | 5237 | && !left->type()->is_slice_type() |
5238 | && right->type()->array_type() != NULL | |
5239 | && !right->type()->is_slice_type()) | |
e9d3367e | 5240 | return this->lower_array_comparison(gogo, inserter); |
ceeb12d7 | 5241 | else if ((left->type()->interface_type() != NULL |
5242 | && right->type()->interface_type() == NULL) | |
5243 | || (left->type()->interface_type() == NULL | |
5244 | && right->type()->interface_type() != NULL)) | |
5245 | return this->lower_interface_value_comparison(gogo, inserter); | |
e9d3367e | 5246 | } |
5247 | ||
736a16ba | 5248 | // Lower string concatenation to String_concat_expression, so that |
5249 | // we can group sequences of string additions. | |
5250 | if (this->left_->type()->is_string_type() && this->op_ == OPERATOR_PLUS) | |
5251 | { | |
5252 | Expression_list* exprs; | |
5253 | String_concat_expression* left_sce = | |
5254 | this->left_->string_concat_expression(); | |
5255 | if (left_sce != NULL) | |
5256 | exprs = left_sce->exprs(); | |
5257 | else | |
5258 | { | |
5259 | exprs = new Expression_list(); | |
5260 | exprs->push_back(this->left_); | |
5261 | } | |
5262 | ||
5263 | String_concat_expression* right_sce = | |
5264 | this->right_->string_concat_expression(); | |
5265 | if (right_sce != NULL) | |
5266 | exprs->append(right_sce->exprs()); | |
5267 | else | |
5268 | exprs->push_back(this->right_); | |
5269 | ||
5270 | return Expression::make_string_concat(exprs); | |
5271 | } | |
5272 | ||
e440a328 | 5273 | return this; |
5274 | } | |
5275 | ||
e9d3367e | 5276 | // Lower a struct comparison. |
5277 | ||
5278 | Expression* | |
5279 | Binary_expression::lower_struct_comparison(Gogo* gogo, | |
5280 | Statement_inserter* inserter) | |
5281 | { | |
5282 | Struct_type* st = this->left_->type()->struct_type(); | |
5283 | Struct_type* st2 = this->right_->type()->struct_type(); | |
5284 | if (st2 == NULL) | |
5285 | return this; | |
5286 | if (st != st2 && !Type::are_identical(st, st2, false, NULL)) | |
5287 | return this; | |
5288 | if (!Type::are_compatible_for_comparison(true, this->left_->type(), | |
5289 | this->right_->type(), NULL)) | |
5290 | return this; | |
5291 | ||
5292 | // See if we can compare using memcmp. As a heuristic, we use | |
5293 | // memcmp rather than field references and comparisons if there are | |
5294 | // more than two fields. | |
113ef6a5 | 5295 | if (st->compare_is_identity(gogo) && st->total_field_count() > 2) |
e9d3367e | 5296 | return this->lower_compare_to_memcmp(gogo, inserter); |
5297 | ||
5298 | Location loc = this->location(); | |
5299 | ||
5300 | Expression* left = this->left_; | |
5301 | Temporary_statement* left_temp = NULL; | |
5302 | if (left->var_expression() == NULL | |
5303 | && left->temporary_reference_expression() == NULL) | |
5304 | { | |
5305 | left_temp = Statement::make_temporary(left->type(), NULL, loc); | |
5306 | inserter->insert(left_temp); | |
5307 | left = Expression::make_set_and_use_temporary(left_temp, left, loc); | |
5308 | } | |
5309 | ||
5310 | Expression* right = this->right_; | |
5311 | Temporary_statement* right_temp = NULL; | |
5312 | if (right->var_expression() == NULL | |
5313 | && right->temporary_reference_expression() == NULL) | |
5314 | { | |
5315 | right_temp = Statement::make_temporary(right->type(), NULL, loc); | |
5316 | inserter->insert(right_temp); | |
5317 | right = Expression::make_set_and_use_temporary(right_temp, right, loc); | |
5318 | } | |
5319 | ||
5320 | Expression* ret = Expression::make_boolean(true, loc); | |
5321 | const Struct_field_list* fields = st->fields(); | |
5322 | unsigned int field_index = 0; | |
5323 | for (Struct_field_list::const_iterator pf = fields->begin(); | |
5324 | pf != fields->end(); | |
5325 | ++pf, ++field_index) | |
5326 | { | |
f5165c05 | 5327 | if (Gogo::is_sink_name(pf->field_name())) |
5328 | continue; | |
5329 | ||
e9d3367e | 5330 | if (field_index > 0) |
5331 | { | |
5332 | if (left_temp == NULL) | |
5333 | left = left->copy(); | |
5334 | else | |
5335 | left = Expression::make_temporary_reference(left_temp, loc); | |
5336 | if (right_temp == NULL) | |
5337 | right = right->copy(); | |
5338 | else | |
5339 | right = Expression::make_temporary_reference(right_temp, loc); | |
5340 | } | |
5341 | Expression* f1 = Expression::make_field_reference(left, field_index, | |
5342 | loc); | |
5343 | Expression* f2 = Expression::make_field_reference(right, field_index, | |
5344 | loc); | |
5345 | Expression* cond = Expression::make_binary(OPERATOR_EQEQ, f1, f2, loc); | |
5346 | ret = Expression::make_binary(OPERATOR_ANDAND, ret, cond, loc); | |
5347 | } | |
5348 | ||
5349 | if (this->op_ == OPERATOR_NOTEQ) | |
5350 | ret = Expression::make_unary(OPERATOR_NOT, ret, loc); | |
5351 | ||
5352 | return ret; | |
5353 | } | |
5354 | ||
5355 | // Lower an array comparison. | |
5356 | ||
5357 | Expression* | |
5358 | Binary_expression::lower_array_comparison(Gogo* gogo, | |
5359 | Statement_inserter* inserter) | |
5360 | { | |
5361 | Array_type* at = this->left_->type()->array_type(); | |
5362 | Array_type* at2 = this->right_->type()->array_type(); | |
5363 | if (at2 == NULL) | |
5364 | return this; | |
5365 | if (at != at2 && !Type::are_identical(at, at2, false, NULL)) | |
5366 | return this; | |
5367 | if (!Type::are_compatible_for_comparison(true, this->left_->type(), | |
5368 | this->right_->type(), NULL)) | |
5369 | return this; | |
5370 | ||
5371 | // Call memcmp directly if possible. This may let the middle-end | |
5372 | // optimize the call. | |
113ef6a5 | 5373 | if (at->compare_is_identity(gogo)) |
e9d3367e | 5374 | return this->lower_compare_to_memcmp(gogo, inserter); |
5375 | ||
5376 | // Call the array comparison function. | |
5377 | Named_object* hash_fn; | |
5378 | Named_object* equal_fn; | |
5379 | at->type_functions(gogo, this->left_->type()->named_type(), NULL, NULL, | |
5380 | &hash_fn, &equal_fn); | |
5381 | ||
5382 | Location loc = this->location(); | |
5383 | ||
5384 | Expression* func = Expression::make_func_reference(equal_fn, NULL, loc); | |
5385 | ||
5386 | Expression_list* args = new Expression_list(); | |
5387 | args->push_back(this->operand_address(inserter, this->left_)); | |
5388 | args->push_back(this->operand_address(inserter, this->right_)); | |
e9d3367e | 5389 | |
5390 | Expression* ret = Expression::make_call(func, args, false, loc); | |
5391 | ||
5392 | if (this->op_ == OPERATOR_NOTEQ) | |
5393 | ret = Expression::make_unary(OPERATOR_NOT, ret, loc); | |
5394 | ||
5395 | return ret; | |
5396 | } | |
5397 | ||
ceeb12d7 | 5398 | // Lower an interface to value comparison. |
5399 | ||
5400 | Expression* | |
5401 | Binary_expression::lower_interface_value_comparison(Gogo*, | |
5402 | Statement_inserter* inserter) | |
5403 | { | |
5404 | Type* left_type = this->left_->type(); | |
5405 | Type* right_type = this->right_->type(); | |
5406 | Interface_type* ift; | |
5407 | if (left_type->interface_type() != NULL) | |
5408 | { | |
5409 | ift = left_type->interface_type(); | |
5410 | if (!ift->implements_interface(right_type, NULL)) | |
5411 | return this; | |
5412 | } | |
5413 | else | |
5414 | { | |
5415 | ift = right_type->interface_type(); | |
5416 | if (!ift->implements_interface(left_type, NULL)) | |
5417 | return this; | |
5418 | } | |
5419 | if (!Type::are_compatible_for_comparison(true, left_type, right_type, NULL)) | |
5420 | return this; | |
5421 | ||
5422 | Location loc = this->location(); | |
5423 | ||
5424 | if (left_type->interface_type() == NULL | |
5425 | && left_type->points_to() == NULL | |
5426 | && !this->left_->is_addressable()) | |
5427 | { | |
5428 | Temporary_statement* temp = | |
5429 | Statement::make_temporary(left_type, NULL, loc); | |
5430 | inserter->insert(temp); | |
5431 | this->left_ = | |
5432 | Expression::make_set_and_use_temporary(temp, this->left_, loc); | |
5433 | } | |
5434 | ||
5435 | if (right_type->interface_type() == NULL | |
5436 | && right_type->points_to() == NULL | |
5437 | && !this->right_->is_addressable()) | |
5438 | { | |
5439 | Temporary_statement* temp = | |
5440 | Statement::make_temporary(right_type, NULL, loc); | |
5441 | inserter->insert(temp); | |
5442 | this->right_ = | |
5443 | Expression::make_set_and_use_temporary(temp, this->right_, loc); | |
5444 | } | |
5445 | ||
5446 | return this; | |
5447 | } | |
5448 | ||
e9d3367e | 5449 | // Lower a struct or array comparison to a call to memcmp. |
5450 | ||
5451 | Expression* | |
5452 | Binary_expression::lower_compare_to_memcmp(Gogo*, Statement_inserter* inserter) | |
5453 | { | |
5454 | Location loc = this->location(); | |
5455 | ||
5456 | Expression* a1 = this->operand_address(inserter, this->left_); | |
5457 | Expression* a2 = this->operand_address(inserter, this->right_); | |
5458 | Expression* len = Expression::make_type_info(this->left_->type(), | |
5459 | TYPE_INFO_SIZE); | |
5460 | ||
5461 | Expression* call = Runtime::make_call(Runtime::MEMCMP, loc, 3, a1, a2, len); | |
e67508fa | 5462 | Expression* zero = Expression::make_integer_ul(0, NULL, loc); |
e9d3367e | 5463 | return Expression::make_binary(this->op_, call, zero, loc); |
5464 | } | |
5465 | ||
a32698ee | 5466 | Expression* |
5c3f3470 | 5467 | Binary_expression::do_flatten(Gogo* gogo, Named_object*, |
a32698ee | 5468 | Statement_inserter* inserter) |
5469 | { | |
5470 | Location loc = this->location(); | |
5bf8be8b | 5471 | if (this->left_->type()->is_error_type() |
5472 | || this->right_->type()->is_error_type() | |
5473 | || this->left_->is_error_expression() | |
5474 | || this->right_->is_error_expression()) | |
5475 | { | |
5476 | go_assert(saw_errors()); | |
5477 | return Expression::make_error(loc); | |
5478 | } | |
5479 | ||
a32698ee | 5480 | Temporary_statement* temp; |
a32698ee | 5481 | |
5482 | Type* left_type = this->left_->type(); | |
5483 | bool is_shift_op = (this->op_ == OPERATOR_LSHIFT | |
5484 | || this->op_ == OPERATOR_RSHIFT); | |
5485 | bool is_idiv_op = ((this->op_ == OPERATOR_DIV && | |
5486 | left_type->integer_type() != NULL) | |
5487 | || this->op_ == OPERATOR_MOD); | |
5488 | ||
a32698ee | 5489 | if (is_shift_op |
5c3f3470 | 5490 | || (is_idiv_op |
5491 | && (gogo->check_divide_by_zero() || gogo->check_divide_overflow()))) | |
a32698ee | 5492 | { |
545ab43b | 5493 | if (!this->left_->is_variable() && !this->left_->is_constant()) |
a32698ee | 5494 | { |
5495 | temp = Statement::make_temporary(NULL, this->left_, loc); | |
5496 | inserter->insert(temp); | |
5497 | this->left_ = Expression::make_temporary_reference(temp, loc); | |
5498 | } | |
545ab43b | 5499 | if (!this->right_->is_variable() && !this->right_->is_constant()) |
a32698ee | 5500 | { |
5501 | temp = | |
5502 | Statement::make_temporary(NULL, this->right_, loc); | |
5503 | this->right_ = Expression::make_temporary_reference(temp, loc); | |
5504 | inserter->insert(temp); | |
5505 | } | |
5506 | } | |
5507 | return this; | |
5508 | } | |
5509 | ||
5510 | ||
e9d3367e | 5511 | // Return the address of EXPR, cast to unsafe.Pointer. |
5512 | ||
5513 | Expression* | |
5514 | Binary_expression::operand_address(Statement_inserter* inserter, | |
5515 | Expression* expr) | |
5516 | { | |
5517 | Location loc = this->location(); | |
5518 | ||
5519 | if (!expr->is_addressable()) | |
5520 | { | |
5521 | Temporary_statement* temp = Statement::make_temporary(expr->type(), NULL, | |
5522 | loc); | |
5523 | inserter->insert(temp); | |
5524 | expr = Expression::make_set_and_use_temporary(temp, expr, loc); | |
5525 | } | |
5526 | expr = Expression::make_unary(OPERATOR_AND, expr, loc); | |
5527 | static_cast<Unary_expression*>(expr)->set_does_not_escape(); | |
5528 | Type* void_type = Type::make_void_type(); | |
5529 | Type* unsafe_pointer_type = Type::make_pointer_type(void_type); | |
5530 | return Expression::make_cast(unsafe_pointer_type, expr, loc); | |
5531 | } | |
5532 | ||
0c77715b | 5533 | // Return the numeric constant value, if it has one. |
e440a328 | 5534 | |
5535 | bool | |
0c77715b | 5536 | Binary_expression::do_numeric_constant_value(Numeric_constant* nc) const |
e440a328 | 5537 | { |
0c77715b | 5538 | Numeric_constant left_nc; |
5539 | if (!this->left_->numeric_constant_value(&left_nc)) | |
5540 | return false; | |
5541 | Numeric_constant right_nc; | |
5542 | if (!this->right_->numeric_constant_value(&right_nc)) | |
5543 | return false; | |
af7a5274 | 5544 | bool issued_error; |
9767e2d3 | 5545 | return Binary_expression::eval_constant(this->op_, &left_nc, &right_nc, |
af7a5274 | 5546 | this->location(), nc, &issued_error); |
e440a328 | 5547 | } |
5548 | ||
5549 | // Note that the value is being discarded. | |
5550 | ||
4f2138d7 | 5551 | bool |
e440a328 | 5552 | Binary_expression::do_discarding_value() |
5553 | { | |
5554 | if (this->op_ == OPERATOR_OROR || this->op_ == OPERATOR_ANDAND) | |
4f2138d7 | 5555 | return this->right_->discarding_value(); |
e440a328 | 5556 | else |
4f2138d7 | 5557 | { |
5558 | this->unused_value_error(); | |
5559 | return false; | |
5560 | } | |
e440a328 | 5561 | } |
5562 | ||
5563 | // Get type. | |
5564 | ||
5565 | Type* | |
5566 | Binary_expression::do_type() | |
5567 | { | |
5f5fea79 | 5568 | if (this->classification() == EXPRESSION_ERROR) |
5569 | return Type::make_error_type(); | |
5570 | ||
e440a328 | 5571 | switch (this->op_) |
5572 | { | |
e440a328 | 5573 | case OPERATOR_EQEQ: |
5574 | case OPERATOR_NOTEQ: | |
5575 | case OPERATOR_LT: | |
5576 | case OPERATOR_LE: | |
5577 | case OPERATOR_GT: | |
5578 | case OPERATOR_GE: | |
e90c9dfc | 5579 | if (this->type_ == NULL) |
5580 | this->type_ = Type::make_boolean_type(); | |
5581 | return this->type_; | |
e440a328 | 5582 | |
5583 | case OPERATOR_PLUS: | |
5584 | case OPERATOR_MINUS: | |
5585 | case OPERATOR_OR: | |
5586 | case OPERATOR_XOR: | |
5587 | case OPERATOR_MULT: | |
5588 | case OPERATOR_DIV: | |
5589 | case OPERATOR_MOD: | |
5590 | case OPERATOR_AND: | |
5591 | case OPERATOR_BITCLEAR: | |
e90c9dfc | 5592 | case OPERATOR_OROR: |
5593 | case OPERATOR_ANDAND: | |
e440a328 | 5594 | { |
0c77715b | 5595 | Type* type; |
5596 | if (!Binary_expression::operation_type(this->op_, | |
5597 | this->left_->type(), | |
5598 | this->right_->type(), | |
5599 | &type)) | |
5600 | return Type::make_error_type(); | |
5601 | return type; | |
e440a328 | 5602 | } |
5603 | ||
5604 | case OPERATOR_LSHIFT: | |
5605 | case OPERATOR_RSHIFT: | |
5606 | return this->left_->type(); | |
5607 | ||
5608 | default: | |
c3e6f413 | 5609 | go_unreachable(); |
e440a328 | 5610 | } |
5611 | } | |
5612 | ||
5613 | // Set type for a binary expression. | |
5614 | ||
5615 | void | |
5616 | Binary_expression::do_determine_type(const Type_context* context) | |
5617 | { | |
5618 | Type* tleft = this->left_->type(); | |
5619 | Type* tright = this->right_->type(); | |
5620 | ||
5621 | // Both sides should have the same type, except for the shift | |
5622 | // operations. For a comparison, we should ignore the incoming | |
5623 | // type. | |
5624 | ||
5625 | bool is_shift_op = (this->op_ == OPERATOR_LSHIFT | |
5626 | || this->op_ == OPERATOR_RSHIFT); | |
5627 | ||
5628 | bool is_comparison = (this->op_ == OPERATOR_EQEQ | |
5629 | || this->op_ == OPERATOR_NOTEQ | |
5630 | || this->op_ == OPERATOR_LT | |
5631 | || this->op_ == OPERATOR_LE | |
5632 | || this->op_ == OPERATOR_GT | |
5633 | || this->op_ == OPERATOR_GE); | |
5634 | ||
c999c2a7 | 5635 | // For constant expressions, the context of the result is not useful in |
5636 | // determining the types of the operands. It is only legal to use abstract | |
5637 | // boolean, numeric, and string constants as operands where it is legal to | |
5638 | // use non-abstract boolean, numeric, and string constants, respectively. | |
5639 | // Any issues with the operation will be resolved in the check_types pass. | |
5640 | bool is_constant_expr = (this->left_->is_constant() | |
5641 | && this->right_->is_constant()); | |
5642 | ||
e440a328 | 5643 | Type_context subcontext(*context); |
5644 | ||
af7a5274 | 5645 | if (is_constant_expr) |
5646 | { | |
5647 | subcontext.type = NULL; | |
5648 | subcontext.may_be_abstract = true; | |
5649 | } | |
5650 | else if (is_comparison) | |
e440a328 | 5651 | { |
5652 | // In a comparison, the context does not determine the types of | |
5653 | // the operands. | |
5654 | subcontext.type = NULL; | |
5655 | } | |
5656 | ||
5657 | // Set the context for the left hand operand. | |
5658 | if (is_shift_op) | |
5659 | { | |
b40dc774 | 5660 | // The right hand operand of a shift plays no role in |
5661 | // determining the type of the left hand operand. | |
e440a328 | 5662 | } |
5663 | else if (!tleft->is_abstract()) | |
5664 | subcontext.type = tleft; | |
5665 | else if (!tright->is_abstract()) | |
5666 | subcontext.type = tright; | |
5667 | else if (subcontext.type == NULL) | |
5668 | { | |
5669 | if ((tleft->integer_type() != NULL && tright->integer_type() != NULL) | |
5670 | || (tleft->float_type() != NULL && tright->float_type() != NULL) | |
5671 | || (tleft->complex_type() != NULL && tright->complex_type() != NULL)) | |
5672 | { | |
5673 | // Both sides have an abstract integer, abstract float, or | |
5674 | // abstract complex type. Just let CONTEXT determine | |
5675 | // whether they may remain abstract or not. | |
5676 | } | |
5677 | else if (tleft->complex_type() != NULL) | |
5678 | subcontext.type = tleft; | |
5679 | else if (tright->complex_type() != NULL) | |
5680 | subcontext.type = tright; | |
5681 | else if (tleft->float_type() != NULL) | |
5682 | subcontext.type = tleft; | |
5683 | else if (tright->float_type() != NULL) | |
5684 | subcontext.type = tright; | |
5685 | else | |
5686 | subcontext.type = tleft; | |
f58a23ae | 5687 | |
5688 | if (subcontext.type != NULL && !context->may_be_abstract) | |
5689 | subcontext.type = subcontext.type->make_non_abstract_type(); | |
e440a328 | 5690 | } |
5691 | ||
af7a5274 | 5692 | this->left_->determine_type(&subcontext); |
e440a328 | 5693 | |
e440a328 | 5694 | if (is_shift_op) |
5695 | { | |
b40dc774 | 5696 | // We may have inherited an unusable type for the shift operand. |
5697 | // Give a useful error if that happened. | |
5698 | if (tleft->is_abstract() | |
5699 | && subcontext.type != NULL | |
8ab6effb | 5700 | && !subcontext.may_be_abstract |
f6bc81e6 | 5701 | && subcontext.type->interface_type() == NULL |
8ab6effb | 5702 | && subcontext.type->integer_type() == NULL) |
b40dc774 | 5703 | this->report_error(("invalid context-determined non-integer type " |
8ab6effb | 5704 | "for left operand of shift")); |
b40dc774 | 5705 | |
5706 | // The context for the right hand operand is the same as for the | |
5707 | // left hand operand, except for a shift operator. | |
e440a328 | 5708 | subcontext.type = Type::lookup_integer_type("uint"); |
5709 | subcontext.may_be_abstract = false; | |
5710 | } | |
5711 | ||
af7a5274 | 5712 | this->right_->determine_type(&subcontext); |
e90c9dfc | 5713 | |
5714 | if (is_comparison) | |
5715 | { | |
5716 | if (this->type_ != NULL && !this->type_->is_abstract()) | |
5717 | ; | |
5718 | else if (context->type != NULL && context->type->is_boolean_type()) | |
5719 | this->type_ = context->type; | |
5720 | else if (!context->may_be_abstract) | |
5721 | this->type_ = Type::lookup_bool_type(); | |
5722 | } | |
e440a328 | 5723 | } |
5724 | ||
5725 | // Report an error if the binary operator OP does not support TYPE. | |
be8b5eee | 5726 | // OTYPE is the type of the other operand. Return whether the |
5727 | // operation is OK. This should not be used for shift. | |
e440a328 | 5728 | |
5729 | bool | |
be8b5eee | 5730 | Binary_expression::check_operator_type(Operator op, Type* type, Type* otype, |
b13c66cd | 5731 | Location location) |
e440a328 | 5732 | { |
5733 | switch (op) | |
5734 | { | |
5735 | case OPERATOR_OROR: | |
5736 | case OPERATOR_ANDAND: | |
c999c2a7 | 5737 | if (!type->is_boolean_type() |
5738 | || !otype->is_boolean_type()) | |
e440a328 | 5739 | { |
631d5788 | 5740 | go_error_at(location, "expected boolean type"); |
e440a328 | 5741 | return false; |
5742 | } | |
5743 | break; | |
5744 | ||
5745 | case OPERATOR_EQEQ: | |
5746 | case OPERATOR_NOTEQ: | |
e9d3367e | 5747 | { |
5748 | std::string reason; | |
5749 | if (!Type::are_compatible_for_comparison(true, type, otype, &reason)) | |
5750 | { | |
631d5788 | 5751 | go_error_at(location, "%s", reason.c_str()); |
e9d3367e | 5752 | return false; |
5753 | } | |
5754 | } | |
e440a328 | 5755 | break; |
5756 | ||
5757 | case OPERATOR_LT: | |
5758 | case OPERATOR_LE: | |
5759 | case OPERATOR_GT: | |
5760 | case OPERATOR_GE: | |
e9d3367e | 5761 | { |
5762 | std::string reason; | |
5763 | if (!Type::are_compatible_for_comparison(false, type, otype, &reason)) | |
5764 | { | |
631d5788 | 5765 | go_error_at(location, "%s", reason.c_str()); |
e9d3367e | 5766 | return false; |
5767 | } | |
5768 | } | |
e440a328 | 5769 | break; |
5770 | ||
5771 | case OPERATOR_PLUS: | |
5772 | case OPERATOR_PLUSEQ: | |
c999c2a7 | 5773 | if ((!type->is_numeric_type() && !type->is_string_type()) |
5774 | || (!otype->is_numeric_type() && !otype->is_string_type())) | |
e440a328 | 5775 | { |
631d5788 | 5776 | go_error_at(location, |
e440a328 | 5777 | "expected integer, floating, complex, or string type"); |
5778 | return false; | |
5779 | } | |
5780 | break; | |
5781 | ||
5782 | case OPERATOR_MINUS: | |
5783 | case OPERATOR_MINUSEQ: | |
5784 | case OPERATOR_MULT: | |
5785 | case OPERATOR_MULTEQ: | |
5786 | case OPERATOR_DIV: | |
5787 | case OPERATOR_DIVEQ: | |
c999c2a7 | 5788 | if (!type->is_numeric_type() || !otype->is_numeric_type()) |
e440a328 | 5789 | { |
631d5788 | 5790 | go_error_at(location, "expected integer, floating, or complex type"); |
e440a328 | 5791 | return false; |
5792 | } | |
5793 | break; | |
5794 | ||
5795 | case OPERATOR_MOD: | |
5796 | case OPERATOR_MODEQ: | |
5797 | case OPERATOR_OR: | |
5798 | case OPERATOR_OREQ: | |
5799 | case OPERATOR_AND: | |
5800 | case OPERATOR_ANDEQ: | |
5801 | case OPERATOR_XOR: | |
5802 | case OPERATOR_XOREQ: | |
5803 | case OPERATOR_BITCLEAR: | |
5804 | case OPERATOR_BITCLEAREQ: | |
c999c2a7 | 5805 | if (type->integer_type() == NULL || otype->integer_type() == NULL) |
e440a328 | 5806 | { |
631d5788 | 5807 | go_error_at(location, "expected integer type"); |
e440a328 | 5808 | return false; |
5809 | } | |
5810 | break; | |
5811 | ||
5812 | default: | |
c3e6f413 | 5813 | go_unreachable(); |
e440a328 | 5814 | } |
5815 | ||
5816 | return true; | |
5817 | } | |
5818 | ||
5819 | // Check types. | |
5820 | ||
5821 | void | |
5822 | Binary_expression::do_check_types(Gogo*) | |
5823 | { | |
5f5fea79 | 5824 | if (this->classification() == EXPRESSION_ERROR) |
5825 | return; | |
5826 | ||
e440a328 | 5827 | Type* left_type = this->left_->type(); |
5828 | Type* right_type = this->right_->type(); | |
5c13bd80 | 5829 | if (left_type->is_error() || right_type->is_error()) |
9fe897ef | 5830 | { |
5831 | this->set_is_error(); | |
5832 | return; | |
5833 | } | |
e440a328 | 5834 | |
5835 | if (this->op_ == OPERATOR_EQEQ | |
5836 | || this->op_ == OPERATOR_NOTEQ | |
5837 | || this->op_ == OPERATOR_LT | |
5838 | || this->op_ == OPERATOR_LE | |
5839 | || this->op_ == OPERATOR_GT | |
5840 | || this->op_ == OPERATOR_GE) | |
5841 | { | |
907c5ecd | 5842 | if (left_type->is_nil_type() && right_type->is_nil_type()) |
5843 | { | |
5844 | this->report_error(_("invalid comparison of nil with nil")); | |
5845 | return; | |
5846 | } | |
e440a328 | 5847 | if (!Type::are_assignable(left_type, right_type, NULL) |
5848 | && !Type::are_assignable(right_type, left_type, NULL)) | |
5849 | { | |
5850 | this->report_error(_("incompatible types in binary expression")); | |
5851 | return; | |
5852 | } | |
5853 | if (!Binary_expression::check_operator_type(this->op_, left_type, | |
be8b5eee | 5854 | right_type, |
e440a328 | 5855 | this->location()) |
5856 | || !Binary_expression::check_operator_type(this->op_, right_type, | |
be8b5eee | 5857 | left_type, |
e440a328 | 5858 | this->location())) |
5859 | { | |
5860 | this->set_is_error(); | |
5861 | return; | |
5862 | } | |
5863 | } | |
5864 | else if (this->op_ != OPERATOR_LSHIFT && this->op_ != OPERATOR_RSHIFT) | |
5865 | { | |
5866 | if (!Type::are_compatible_for_binop(left_type, right_type)) | |
5867 | { | |
5868 | this->report_error(_("incompatible types in binary expression")); | |
5869 | return; | |
5870 | } | |
5871 | if (!Binary_expression::check_operator_type(this->op_, left_type, | |
be8b5eee | 5872 | right_type, |
e440a328 | 5873 | this->location())) |
5874 | { | |
5875 | this->set_is_error(); | |
5876 | return; | |
5877 | } | |
5c65b19d | 5878 | if (this->op_ == OPERATOR_DIV || this->op_ == OPERATOR_MOD) |
5879 | { | |
5880 | // Division by a zero integer constant is an error. | |
5881 | Numeric_constant rconst; | |
5882 | unsigned long rval; | |
5883 | if (left_type->integer_type() != NULL | |
5884 | && this->right_->numeric_constant_value(&rconst) | |
5885 | && rconst.to_unsigned_long(&rval) == Numeric_constant::NC_UL_VALID | |
5886 | && rval == 0) | |
5887 | { | |
5888 | this->report_error(_("integer division by zero")); | |
5889 | return; | |
5890 | } | |
5891 | } | |
e440a328 | 5892 | } |
5893 | else | |
5894 | { | |
5895 | if (left_type->integer_type() == NULL) | |
5896 | this->report_error(_("shift of non-integer operand")); | |
5897 | ||
6b5e0fac | 5898 | if (right_type->is_string_type()) |
5899 | this->report_error(_("shift count not unsigned integer")); | |
5900 | else if (!right_type->is_abstract() | |
e440a328 | 5901 | && (right_type->integer_type() == NULL |
5902 | || !right_type->integer_type()->is_unsigned())) | |
5903 | this->report_error(_("shift count not unsigned integer")); | |
5904 | else | |
5905 | { | |
0c77715b | 5906 | Numeric_constant nc; |
5907 | if (this->right_->numeric_constant_value(&nc)) | |
e440a328 | 5908 | { |
0c77715b | 5909 | mpz_t val; |
5910 | if (!nc.to_int(&val)) | |
5911 | this->report_error(_("shift count not unsigned integer")); | |
5912 | else | |
a4eba91b | 5913 | { |
0c77715b | 5914 | if (mpz_sgn(val) < 0) |
5915 | { | |
5916 | this->report_error(_("negative shift count")); | |
0c77715b | 5917 | Location rloc = this->right_->location(); |
e67508fa | 5918 | this->right_ = Expression::make_integer_ul(0, right_type, |
5919 | rloc); | |
0c77715b | 5920 | } |
5921 | mpz_clear(val); | |
a4eba91b | 5922 | } |
e440a328 | 5923 | } |
e440a328 | 5924 | } |
5925 | } | |
5926 | } | |
5927 | ||
ea664253 | 5928 | // Get the backend representation for a binary expression. |
e440a328 | 5929 | |
ea664253 | 5930 | Bexpression* |
5931 | Binary_expression::do_get_backend(Translate_context* context) | |
e440a328 | 5932 | { |
1b1f2abf | 5933 | Gogo* gogo = context->gogo(); |
a32698ee | 5934 | Location loc = this->location(); |
5935 | Type* left_type = this->left_->type(); | |
5936 | Type* right_type = this->right_->type(); | |
1b1f2abf | 5937 | |
e440a328 | 5938 | bool use_left_type = true; |
5939 | bool is_shift_op = false; | |
29a2d1d8 | 5940 | bool is_idiv_op = false; |
e440a328 | 5941 | switch (this->op_) |
5942 | { | |
5943 | case OPERATOR_EQEQ: | |
5944 | case OPERATOR_NOTEQ: | |
5945 | case OPERATOR_LT: | |
5946 | case OPERATOR_LE: | |
5947 | case OPERATOR_GT: | |
5948 | case OPERATOR_GE: | |
ea664253 | 5949 | return Expression::comparison(context, this->type_, this->op_, |
5950 | this->left_, this->right_, loc); | |
e440a328 | 5951 | |
5952 | case OPERATOR_OROR: | |
e440a328 | 5953 | case OPERATOR_ANDAND: |
e440a328 | 5954 | use_left_type = false; |
5955 | break; | |
5956 | case OPERATOR_PLUS: | |
e440a328 | 5957 | case OPERATOR_MINUS: |
e440a328 | 5958 | case OPERATOR_OR: |
e440a328 | 5959 | case OPERATOR_XOR: |
e440a328 | 5960 | case OPERATOR_MULT: |
e440a328 | 5961 | break; |
5962 | case OPERATOR_DIV: | |
a32698ee | 5963 | if (left_type->float_type() != NULL || left_type->complex_type() != NULL) |
5964 | break; | |
729f8831 | 5965 | // Fall through. |
e440a328 | 5966 | case OPERATOR_MOD: |
29a2d1d8 | 5967 | is_idiv_op = true; |
e440a328 | 5968 | break; |
5969 | case OPERATOR_LSHIFT: | |
e440a328 | 5970 | case OPERATOR_RSHIFT: |
e440a328 | 5971 | is_shift_op = true; |
5972 | break; | |
e440a328 | 5973 | case OPERATOR_BITCLEAR: |
a32698ee | 5974 | this->right_ = Expression::make_unary(OPERATOR_XOR, this->right_, loc); |
5975 | case OPERATOR_AND: | |
e440a328 | 5976 | break; |
5977 | default: | |
c3e6f413 | 5978 | go_unreachable(); |
e440a328 | 5979 | } |
5980 | ||
736a16ba | 5981 | // The only binary operation for string is +, and that should have |
5982 | // been converted to a String_concat_expression in do_lower. | |
5983 | go_assert(!left_type->is_string_type()); | |
a32698ee | 5984 | |
5985 | // For complex division Go might want slightly different results than the | |
5986 | // backend implementation provides, so we have our own runtime routine. | |
1850e20c | 5987 | if (this->op_ == OPERATOR_DIV && this->left_->type()->complex_type() != NULL) |
5988 | { | |
a32698ee | 5989 | Runtime::Function complex_code; |
1850e20c | 5990 | switch (this->left_->type()->complex_type()->bits()) |
5991 | { | |
5992 | case 64: | |
a32698ee | 5993 | complex_code = Runtime::COMPLEX64_DIV; |
1850e20c | 5994 | break; |
5995 | case 128: | |
a32698ee | 5996 | complex_code = Runtime::COMPLEX128_DIV; |
1850e20c | 5997 | break; |
5998 | default: | |
5999 | go_unreachable(); | |
6000 | } | |
a32698ee | 6001 | Expression* complex_div = |
6002 | Runtime::make_call(complex_code, loc, 2, this->left_, this->right_); | |
ea664253 | 6003 | return complex_div->get_backend(context); |
1850e20c | 6004 | } |
6005 | ||
ea664253 | 6006 | Bexpression* left = this->left_->get_backend(context); |
6007 | Bexpression* right = this->right_->get_backend(context); | |
e440a328 | 6008 | |
a32698ee | 6009 | Type* type = use_left_type ? left_type : right_type; |
6010 | Btype* btype = type->get_backend(gogo); | |
6011 | ||
6012 | Bexpression* ret = | |
6013 | gogo->backend()->binary_expression(this->op_, left, right, loc); | |
6014 | ret = gogo->backend()->convert_expression(btype, ret, loc); | |
e440a328 | 6015 | |
a32698ee | 6016 | // Initialize overflow constants. |
6017 | Bexpression* overflow; | |
6018 | mpz_t zero; | |
6019 | mpz_init_set_ui(zero, 0UL); | |
6020 | mpz_t one; | |
6021 | mpz_init_set_ui(one, 1UL); | |
6022 | mpz_t neg_one; | |
6023 | mpz_init_set_si(neg_one, -1); | |
e440a328 | 6024 | |
a32698ee | 6025 | Btype* left_btype = left_type->get_backend(gogo); |
6026 | Btype* right_btype = right_type->get_backend(gogo); | |
e440a328 | 6027 | |
6028 | // In Go, a shift larger than the size of the type is well-defined. | |
a32698ee | 6029 | // This is not true in C, so we need to insert a conditional. |
e440a328 | 6030 | if (is_shift_op) |
6031 | { | |
a32698ee | 6032 | go_assert(left_type->integer_type() != NULL); |
e440a328 | 6033 | |
a32698ee | 6034 | mpz_t bitsval; |
6035 | int bits = left_type->integer_type()->bits(); | |
6036 | mpz_init_set_ui(bitsval, bits); | |
6037 | Bexpression* bits_expr = | |
6038 | gogo->backend()->integer_constant_expression(right_btype, bitsval); | |
6039 | Bexpression* compare = | |
6040 | gogo->backend()->binary_expression(OPERATOR_LT, | |
6041 | right, bits_expr, loc); | |
e440a328 | 6042 | |
a32698ee | 6043 | Bexpression* zero_expr = |
6044 | gogo->backend()->integer_constant_expression(left_btype, zero); | |
6045 | overflow = zero_expr; | |
93715b75 | 6046 | Bfunction* bfn = context->function()->func_value()->get_decl(); |
e440a328 | 6047 | if (this->op_ == OPERATOR_RSHIFT |
a32698ee | 6048 | && !left_type->integer_type()->is_unsigned()) |
e440a328 | 6049 | { |
a32698ee | 6050 | Bexpression* neg_expr = |
6051 | gogo->backend()->binary_expression(OPERATOR_LT, left, | |
6052 | zero_expr, loc); | |
6053 | Bexpression* neg_one_expr = | |
6054 | gogo->backend()->integer_constant_expression(left_btype, neg_one); | |
93715b75 | 6055 | overflow = gogo->backend()->conditional_expression(bfn, |
6056 | btype, neg_expr, | |
a32698ee | 6057 | neg_one_expr, |
6058 | zero_expr, loc); | |
29a2d1d8 | 6059 | } |
93715b75 | 6060 | ret = gogo->backend()->conditional_expression(bfn, btype, compare, ret, |
a32698ee | 6061 | overflow, loc); |
6062 | mpz_clear(bitsval); | |
29a2d1d8 | 6063 | } |
6064 | ||
6065 | // Add checks for division by zero and division overflow as needed. | |
6066 | if (is_idiv_op) | |
6067 | { | |
5c3f3470 | 6068 | if (gogo->check_divide_by_zero()) |
29a2d1d8 | 6069 | { |
6070 | // right == 0 | |
a32698ee | 6071 | Bexpression* zero_expr = |
6072 | gogo->backend()->integer_constant_expression(right_btype, zero); | |
6073 | Bexpression* check = | |
6074 | gogo->backend()->binary_expression(OPERATOR_EQEQ, | |
6075 | right, zero_expr, loc); | |
29a2d1d8 | 6076 | |
a32698ee | 6077 | // __go_runtime_error(RUNTIME_ERROR_DIVISION_BY_ZERO) |
29a2d1d8 | 6078 | int errcode = RUNTIME_ERROR_DIVISION_BY_ZERO; |
ea664253 | 6079 | Bexpression* crash = gogo->runtime_error(errcode, |
6080 | loc)->get_backend(context); | |
29a2d1d8 | 6081 | |
6082 | // right == 0 ? (__go_runtime_error(...), 0) : ret | |
93715b75 | 6083 | Bfunction* bfn = context->function()->func_value()->get_decl(); |
6084 | ret = gogo->backend()->conditional_expression(bfn, btype, | |
6085 | check, crash, | |
ea664253 | 6086 | ret, loc); |
b13c66cd | 6087 | } |
6088 | ||
5c3f3470 | 6089 | if (gogo->check_divide_overflow()) |
29a2d1d8 | 6090 | { |
6091 | // right == -1 | |
6092 | // FIXME: It would be nice to say that this test is expected | |
6093 | // to return false. | |
a32698ee | 6094 | |
6095 | Bexpression* neg_one_expr = | |
6096 | gogo->backend()->integer_constant_expression(right_btype, neg_one); | |
6097 | Bexpression* check = | |
6098 | gogo->backend()->binary_expression(OPERATOR_EQEQ, | |
6099 | right, neg_one_expr, loc); | |
6100 | ||
6101 | Bexpression* zero_expr = | |
6102 | gogo->backend()->integer_constant_expression(btype, zero); | |
6103 | Bexpression* one_expr = | |
6104 | gogo->backend()->integer_constant_expression(btype, one); | |
93715b75 | 6105 | Bfunction* bfn = context->function()->func_value()->get_decl(); |
a32698ee | 6106 | |
6107 | if (type->integer_type()->is_unsigned()) | |
29a2d1d8 | 6108 | { |
6109 | // An unsigned -1 is the largest possible number, so | |
6110 | // dividing is always 1 or 0. | |
a32698ee | 6111 | |
6112 | Bexpression* cmp = | |
6113 | gogo->backend()->binary_expression(OPERATOR_EQEQ, | |
6114 | left, right, loc); | |
29a2d1d8 | 6115 | if (this->op_ == OPERATOR_DIV) |
a32698ee | 6116 | overflow = |
93715b75 | 6117 | gogo->backend()->conditional_expression(bfn, btype, cmp, |
a32698ee | 6118 | one_expr, zero_expr, |
6119 | loc); | |
29a2d1d8 | 6120 | else |
a32698ee | 6121 | overflow = |
93715b75 | 6122 | gogo->backend()->conditional_expression(bfn, btype, cmp, |
a32698ee | 6123 | zero_expr, left, |
6124 | loc); | |
29a2d1d8 | 6125 | } |
6126 | else | |
6127 | { | |
6128 | // Computing left / -1 is the same as computing - left, | |
6129 | // which does not overflow since Go sets -fwrapv. | |
6130 | if (this->op_ == OPERATOR_DIV) | |
a32698ee | 6131 | { |
6132 | Expression* negate_expr = | |
6133 | Expression::make_unary(OPERATOR_MINUS, this->left_, loc); | |
ea664253 | 6134 | overflow = negate_expr->get_backend(context); |
a32698ee | 6135 | } |
29a2d1d8 | 6136 | else |
a32698ee | 6137 | overflow = zero_expr; |
29a2d1d8 | 6138 | } |
a32698ee | 6139 | overflow = gogo->backend()->convert_expression(btype, overflow, loc); |
29a2d1d8 | 6140 | |
6141 | // right == -1 ? - left : ret | |
93715b75 | 6142 | ret = gogo->backend()->conditional_expression(bfn, btype, |
6143 | check, overflow, | |
a32698ee | 6144 | ret, loc); |
29a2d1d8 | 6145 | } |
e440a328 | 6146 | } |
6147 | ||
a32698ee | 6148 | mpz_clear(zero); |
6149 | mpz_clear(one); | |
6150 | mpz_clear(neg_one); | |
ea664253 | 6151 | return ret; |
e440a328 | 6152 | } |
6153 | ||
6154 | // Export a binary expression. | |
6155 | ||
6156 | void | |
6157 | Binary_expression::do_export(Export* exp) const | |
6158 | { | |
6159 | exp->write_c_string("("); | |
6160 | this->left_->export_expression(exp); | |
6161 | switch (this->op_) | |
6162 | { | |
6163 | case OPERATOR_OROR: | |
6164 | exp->write_c_string(" || "); | |
6165 | break; | |
6166 | case OPERATOR_ANDAND: | |
6167 | exp->write_c_string(" && "); | |
6168 | break; | |
6169 | case OPERATOR_EQEQ: | |
6170 | exp->write_c_string(" == "); | |
6171 | break; | |
6172 | case OPERATOR_NOTEQ: | |
6173 | exp->write_c_string(" != "); | |
6174 | break; | |
6175 | case OPERATOR_LT: | |
6176 | exp->write_c_string(" < "); | |
6177 | break; | |
6178 | case OPERATOR_LE: | |
6179 | exp->write_c_string(" <= "); | |
6180 | break; | |
6181 | case OPERATOR_GT: | |
6182 | exp->write_c_string(" > "); | |
6183 | break; | |
6184 | case OPERATOR_GE: | |
6185 | exp->write_c_string(" >= "); | |
6186 | break; | |
6187 | case OPERATOR_PLUS: | |
6188 | exp->write_c_string(" + "); | |
6189 | break; | |
6190 | case OPERATOR_MINUS: | |
6191 | exp->write_c_string(" - "); | |
6192 | break; | |
6193 | case OPERATOR_OR: | |
6194 | exp->write_c_string(" | "); | |
6195 | break; | |
6196 | case OPERATOR_XOR: | |
6197 | exp->write_c_string(" ^ "); | |
6198 | break; | |
6199 | case OPERATOR_MULT: | |
6200 | exp->write_c_string(" * "); | |
6201 | break; | |
6202 | case OPERATOR_DIV: | |
6203 | exp->write_c_string(" / "); | |
6204 | break; | |
6205 | case OPERATOR_MOD: | |
6206 | exp->write_c_string(" % "); | |
6207 | break; | |
6208 | case OPERATOR_LSHIFT: | |
6209 | exp->write_c_string(" << "); | |
6210 | break; | |
6211 | case OPERATOR_RSHIFT: | |
6212 | exp->write_c_string(" >> "); | |
6213 | break; | |
6214 | case OPERATOR_AND: | |
6215 | exp->write_c_string(" & "); | |
6216 | break; | |
6217 | case OPERATOR_BITCLEAR: | |
6218 | exp->write_c_string(" &^ "); | |
6219 | break; | |
6220 | default: | |
c3e6f413 | 6221 | go_unreachable(); |
e440a328 | 6222 | } |
6223 | this->right_->export_expression(exp); | |
6224 | exp->write_c_string(")"); | |
6225 | } | |
6226 | ||
6227 | // Import a binary expression. | |
6228 | ||
6229 | Expression* | |
6230 | Binary_expression::do_import(Import* imp) | |
6231 | { | |
6232 | imp->require_c_string("("); | |
6233 | ||
6234 | Expression* left = Expression::import_expression(imp); | |
6235 | ||
6236 | Operator op; | |
6237 | if (imp->match_c_string(" || ")) | |
6238 | { | |
6239 | op = OPERATOR_OROR; | |
6240 | imp->advance(4); | |
6241 | } | |
6242 | else if (imp->match_c_string(" && ")) | |
6243 | { | |
6244 | op = OPERATOR_ANDAND; | |
6245 | imp->advance(4); | |
6246 | } | |
6247 | else if (imp->match_c_string(" == ")) | |
6248 | { | |
6249 | op = OPERATOR_EQEQ; | |
6250 | imp->advance(4); | |
6251 | } | |
6252 | else if (imp->match_c_string(" != ")) | |
6253 | { | |
6254 | op = OPERATOR_NOTEQ; | |
6255 | imp->advance(4); | |
6256 | } | |
6257 | else if (imp->match_c_string(" < ")) | |
6258 | { | |
6259 | op = OPERATOR_LT; | |
6260 | imp->advance(3); | |
6261 | } | |
6262 | else if (imp->match_c_string(" <= ")) | |
6263 | { | |
6264 | op = OPERATOR_LE; | |
6265 | imp->advance(4); | |
6266 | } | |
6267 | else if (imp->match_c_string(" > ")) | |
6268 | { | |
6269 | op = OPERATOR_GT; | |
6270 | imp->advance(3); | |
6271 | } | |
6272 | else if (imp->match_c_string(" >= ")) | |
6273 | { | |
6274 | op = OPERATOR_GE; | |
6275 | imp->advance(4); | |
6276 | } | |
6277 | else if (imp->match_c_string(" + ")) | |
6278 | { | |
6279 | op = OPERATOR_PLUS; | |
6280 | imp->advance(3); | |
6281 | } | |
6282 | else if (imp->match_c_string(" - ")) | |
6283 | { | |
6284 | op = OPERATOR_MINUS; | |
6285 | imp->advance(3); | |
6286 | } | |
6287 | else if (imp->match_c_string(" | ")) | |
6288 | { | |
6289 | op = OPERATOR_OR; | |
6290 | imp->advance(3); | |
6291 | } | |
6292 | else if (imp->match_c_string(" ^ ")) | |
6293 | { | |
6294 | op = OPERATOR_XOR; | |
6295 | imp->advance(3); | |
6296 | } | |
6297 | else if (imp->match_c_string(" * ")) | |
6298 | { | |
6299 | op = OPERATOR_MULT; | |
6300 | imp->advance(3); | |
6301 | } | |
6302 | else if (imp->match_c_string(" / ")) | |
6303 | { | |
6304 | op = OPERATOR_DIV; | |
6305 | imp->advance(3); | |
6306 | } | |
6307 | else if (imp->match_c_string(" % ")) | |
6308 | { | |
6309 | op = OPERATOR_MOD; | |
6310 | imp->advance(3); | |
6311 | } | |
6312 | else if (imp->match_c_string(" << ")) | |
6313 | { | |
6314 | op = OPERATOR_LSHIFT; | |
6315 | imp->advance(4); | |
6316 | } | |
6317 | else if (imp->match_c_string(" >> ")) | |
6318 | { | |
6319 | op = OPERATOR_RSHIFT; | |
6320 | imp->advance(4); | |
6321 | } | |
6322 | else if (imp->match_c_string(" & ")) | |
6323 | { | |
6324 | op = OPERATOR_AND; | |
6325 | imp->advance(3); | |
6326 | } | |
6327 | else if (imp->match_c_string(" &^ ")) | |
6328 | { | |
6329 | op = OPERATOR_BITCLEAR; | |
6330 | imp->advance(4); | |
6331 | } | |
6332 | else | |
6333 | { | |
631d5788 | 6334 | go_error_at(imp->location(), "unrecognized binary operator"); |
e440a328 | 6335 | return Expression::make_error(imp->location()); |
6336 | } | |
6337 | ||
6338 | Expression* right = Expression::import_expression(imp); | |
6339 | ||
6340 | imp->require_c_string(")"); | |
6341 | ||
6342 | return Expression::make_binary(op, left, right, imp->location()); | |
6343 | } | |
6344 | ||
d751bb78 | 6345 | // Dump ast representation of a binary expression. |
6346 | ||
6347 | void | |
6348 | Binary_expression::do_dump_expression(Ast_dump_context* ast_dump_context) const | |
6349 | { | |
6350 | ast_dump_context->ostream() << "("; | |
6351 | ast_dump_context->dump_expression(this->left_); | |
6352 | ast_dump_context->ostream() << " "; | |
6353 | ast_dump_context->dump_operator(this->op_); | |
6354 | ast_dump_context->ostream() << " "; | |
6355 | ast_dump_context->dump_expression(this->right_); | |
6356 | ast_dump_context->ostream() << ") "; | |
6357 | } | |
6358 | ||
e440a328 | 6359 | // Make a binary expression. |
6360 | ||
6361 | Expression* | |
6362 | Expression::make_binary(Operator op, Expression* left, Expression* right, | |
b13c66cd | 6363 | Location location) |
e440a328 | 6364 | { |
6365 | return new Binary_expression(op, left, right, location); | |
6366 | } | |
6367 | ||
6368 | // Implement a comparison. | |
6369 | ||
a32698ee | 6370 | Bexpression* |
6371 | Expression::comparison(Translate_context* context, Type* result_type, | |
6372 | Operator op, Expression* left, Expression* right, | |
6373 | Location location) | |
e440a328 | 6374 | { |
2387f644 | 6375 | Type* left_type = left->type(); |
6376 | Type* right_type = right->type(); | |
ceeb12d7 | 6377 | |
e67508fa | 6378 | Expression* zexpr = Expression::make_integer_ul(0, NULL, location); |
1b1f2abf | 6379 | |
15c67ee2 | 6380 | if (left_type->is_string_type() && right_type->is_string_type()) |
e440a328 | 6381 | { |
6098d6cb | 6382 | if (op == OPERATOR_EQEQ || op == OPERATOR_NOTEQ) |
6383 | { | |
6384 | left = Runtime::make_call(Runtime::EQSTRING, location, 2, | |
6385 | left, right); | |
6386 | right = Expression::make_boolean(true, location); | |
6387 | } | |
6388 | else | |
6389 | { | |
6390 | left = Runtime::make_call(Runtime::CMPSTRING, location, 2, | |
6391 | left, right); | |
6392 | right = zexpr; | |
6393 | } | |
e440a328 | 6394 | } |
15c67ee2 | 6395 | else if ((left_type->interface_type() != NULL |
6396 | && right_type->interface_type() == NULL | |
6397 | && !right_type->is_nil_type()) | |
6398 | || (left_type->interface_type() == NULL | |
6399 | && !left_type->is_nil_type() | |
6400 | && right_type->interface_type() != NULL)) | |
e440a328 | 6401 | { |
6402 | // Comparing an interface value to a non-interface value. | |
6403 | if (left_type->interface_type() == NULL) | |
6404 | { | |
6405 | std::swap(left_type, right_type); | |
2387f644 | 6406 | std::swap(left, right); |
e440a328 | 6407 | } |
6408 | ||
6409 | // The right operand is not an interface. We need to take its | |
6410 | // address if it is not a pointer. | |
ceeb12d7 | 6411 | Expression* pointer_arg = NULL; |
e440a328 | 6412 | if (right_type->points_to() != NULL) |
2387f644 | 6413 | pointer_arg = right; |
e440a328 | 6414 | else |
6415 | { | |
2387f644 | 6416 | go_assert(right->is_addressable()); |
6417 | pointer_arg = Expression::make_unary(OPERATOR_AND, right, | |
ceeb12d7 | 6418 | location); |
e440a328 | 6419 | } |
e440a328 | 6420 | |
2387f644 | 6421 | Expression* descriptor = |
6422 | Expression::make_type_descriptor(right_type, location); | |
6423 | left = | |
ceeb12d7 | 6424 | Runtime::make_call((left_type->interface_type()->is_empty() |
6098d6cb | 6425 | ? Runtime::EFACEVALEQ |
6426 | : Runtime::IFACEVALEQ), | |
2387f644 | 6427 | location, 3, left, descriptor, |
ceeb12d7 | 6428 | pointer_arg); |
6098d6cb | 6429 | go_assert(op == OPERATOR_EQEQ || op == OPERATOR_NOTEQ); |
6430 | right = Expression::make_boolean(true, location); | |
e440a328 | 6431 | } |
6432 | else if (left_type->interface_type() != NULL | |
6433 | && right_type->interface_type() != NULL) | |
6434 | { | |
ceeb12d7 | 6435 | Runtime::Function compare_function; |
739bad04 | 6436 | if (left_type->interface_type()->is_empty() |
6437 | && right_type->interface_type()->is_empty()) | |
6098d6cb | 6438 | compare_function = Runtime::EFACEEQ; |
739bad04 | 6439 | else if (!left_type->interface_type()->is_empty() |
6440 | && !right_type->interface_type()->is_empty()) | |
6098d6cb | 6441 | compare_function = Runtime::IFACEEQ; |
739bad04 | 6442 | else |
6443 | { | |
6444 | if (left_type->interface_type()->is_empty()) | |
6445 | { | |
739bad04 | 6446 | std::swap(left_type, right_type); |
2387f644 | 6447 | std::swap(left, right); |
739bad04 | 6448 | } |
c484d925 | 6449 | go_assert(!left_type->interface_type()->is_empty()); |
6450 | go_assert(right_type->interface_type()->is_empty()); | |
6098d6cb | 6451 | compare_function = Runtime::IFACEEFACEEQ; |
739bad04 | 6452 | } |
6453 | ||
2387f644 | 6454 | left = Runtime::make_call(compare_function, location, 2, left, right); |
6098d6cb | 6455 | go_assert(op == OPERATOR_EQEQ || op == OPERATOR_NOTEQ); |
6456 | right = Expression::make_boolean(true, location); | |
e440a328 | 6457 | } |
6458 | ||
6459 | if (left_type->is_nil_type() | |
6460 | && (op == OPERATOR_EQEQ || op == OPERATOR_NOTEQ)) | |
6461 | { | |
6462 | std::swap(left_type, right_type); | |
2387f644 | 6463 | std::swap(left, right); |
e440a328 | 6464 | } |
6465 | ||
6466 | if (right_type->is_nil_type()) | |
6467 | { | |
2387f644 | 6468 | right = Expression::make_nil(location); |
e440a328 | 6469 | if (left_type->array_type() != NULL |
6470 | && left_type->array_type()->length() == NULL) | |
6471 | { | |
6472 | Array_type* at = left_type->array_type(); | |
2387f644 | 6473 | left = at->get_value_pointer(context->gogo(), left); |
e440a328 | 6474 | } |
6475 | else if (left_type->interface_type() != NULL) | |
6476 | { | |
6477 | // An interface is nil if the first field is nil. | |
2387f644 | 6478 | left = Expression::make_field_reference(left, 0, location); |
e440a328 | 6479 | } |
6480 | } | |
6481 | ||
ea664253 | 6482 | Bexpression* left_bexpr = left->get_backend(context); |
6483 | Bexpression* right_bexpr = right->get_backend(context); | |
e90c9dfc | 6484 | |
a32698ee | 6485 | Gogo* gogo = context->gogo(); |
6486 | Bexpression* ret = gogo->backend()->binary_expression(op, left_bexpr, | |
6487 | right_bexpr, location); | |
6488 | if (result_type != NULL) | |
6489 | ret = gogo->backend()->convert_expression(result_type->get_backend(gogo), | |
6490 | ret, location); | |
e440a328 | 6491 | return ret; |
6492 | } | |
6493 | ||
736a16ba | 6494 | // Class String_concat_expression. |
6495 | ||
6496 | bool | |
6497 | String_concat_expression::do_is_constant() const | |
6498 | { | |
6499 | for (Expression_list::const_iterator pe = this->exprs_->begin(); | |
6500 | pe != this->exprs_->end(); | |
6501 | ++pe) | |
6502 | { | |
6503 | if (!(*pe)->is_constant()) | |
6504 | return false; | |
6505 | } | |
6506 | return true; | |
6507 | } | |
6508 | ||
6509 | bool | |
3ae06f68 | 6510 | String_concat_expression::do_is_static_initializer() const |
736a16ba | 6511 | { |
6512 | for (Expression_list::const_iterator pe = this->exprs_->begin(); | |
6513 | pe != this->exprs_->end(); | |
6514 | ++pe) | |
6515 | { | |
3ae06f68 | 6516 | if (!(*pe)->is_static_initializer()) |
736a16ba | 6517 | return false; |
6518 | } | |
6519 | return true; | |
6520 | } | |
6521 | ||
6522 | Type* | |
6523 | String_concat_expression::do_type() | |
6524 | { | |
6525 | Type* t = this->exprs_->front()->type(); | |
6526 | Expression_list::iterator pe = this->exprs_->begin(); | |
6527 | ++pe; | |
6528 | for (; pe != this->exprs_->end(); ++pe) | |
6529 | { | |
6530 | Type* t1; | |
6531 | if (!Binary_expression::operation_type(OPERATOR_PLUS, t, | |
6532 | (*pe)->type(), | |
6533 | &t1)) | |
6534 | return Type::make_error_type(); | |
6535 | t = t1; | |
6536 | } | |
6537 | return t; | |
6538 | } | |
6539 | ||
6540 | void | |
6541 | String_concat_expression::do_determine_type(const Type_context* context) | |
6542 | { | |
6543 | Type_context subcontext(*context); | |
6544 | for (Expression_list::iterator pe = this->exprs_->begin(); | |
6545 | pe != this->exprs_->end(); | |
6546 | ++pe) | |
6547 | { | |
6548 | Type* t = (*pe)->type(); | |
6549 | if (!t->is_abstract()) | |
6550 | { | |
6551 | subcontext.type = t; | |
6552 | break; | |
6553 | } | |
6554 | } | |
6555 | if (subcontext.type == NULL) | |
6556 | subcontext.type = this->exprs_->front()->type(); | |
6557 | for (Expression_list::iterator pe = this->exprs_->begin(); | |
6558 | pe != this->exprs_->end(); | |
6559 | ++pe) | |
6560 | (*pe)->determine_type(&subcontext); | |
6561 | } | |
6562 | ||
6563 | void | |
6564 | String_concat_expression::do_check_types(Gogo*) | |
6565 | { | |
6566 | if (this->is_error_expression()) | |
6567 | return; | |
6568 | Type* t = this->exprs_->front()->type(); | |
6569 | if (t->is_error()) | |
6570 | { | |
6571 | this->set_is_error(); | |
6572 | return; | |
6573 | } | |
6574 | Expression_list::iterator pe = this->exprs_->begin(); | |
6575 | ++pe; | |
6576 | for (; pe != this->exprs_->end(); ++pe) | |
6577 | { | |
6578 | Type* t1 = (*pe)->type(); | |
6579 | if (!Type::are_compatible_for_binop(t, t1)) | |
6580 | { | |
6581 | this->report_error("incompatible types in binary expression"); | |
6582 | return; | |
6583 | } | |
6584 | if (!Binary_expression::check_operator_type(OPERATOR_PLUS, t, t1, | |
6585 | this->location())) | |
6586 | { | |
6587 | this->set_is_error(); | |
6588 | return; | |
6589 | } | |
6590 | } | |
6591 | } | |
6592 | ||
6593 | Expression* | |
6594 | String_concat_expression::do_flatten(Gogo*, Named_object*, | |
6595 | Statement_inserter*) | |
6596 | { | |
6597 | if (this->is_error_expression()) | |
6598 | return this; | |
6599 | Location loc = this->location(); | |
6600 | Type* type = this->type(); | |
6601 | Expression* nil_arg = Expression::make_nil(loc); | |
6602 | Expression* call; | |
6603 | switch (this->exprs_->size()) | |
6604 | { | |
6605 | case 0: case 1: | |
6606 | go_unreachable(); | |
6607 | ||
6608 | case 2: case 3: case 4: case 5: | |
6609 | { | |
6610 | Expression* len = Expression::make_integer_ul(this->exprs_->size(), | |
6611 | NULL, loc); | |
6612 | Array_type* arg_type = Type::make_array_type(type, len); | |
6613 | arg_type->set_is_array_incomparable(); | |
6614 | Expression* arg = | |
6615 | Expression::make_array_composite_literal(arg_type, this->exprs_, | |
6616 | loc); | |
6617 | Runtime::Function code; | |
6618 | switch (this->exprs_->size()) | |
6619 | { | |
6620 | default: | |
6621 | go_unreachable(); | |
6622 | case 2: | |
6623 | code = Runtime::CONCATSTRING2; | |
6624 | break; | |
6625 | case 3: | |
6626 | code = Runtime::CONCATSTRING3; | |
6627 | break; | |
6628 | case 4: | |
6629 | code = Runtime::CONCATSTRING4; | |
6630 | break; | |
6631 | case 5: | |
6632 | code = Runtime::CONCATSTRING5; | |
6633 | break; | |
6634 | } | |
6635 | call = Runtime::make_call(code, loc, 2, nil_arg, arg); | |
6636 | } | |
6637 | break; | |
6638 | ||
6639 | default: | |
6640 | { | |
6641 | Type* arg_type = Type::make_array_type(type, NULL); | |
6642 | Slice_construction_expression* sce = | |
6643 | Expression::make_slice_composite_literal(arg_type, this->exprs_, | |
6644 | loc); | |
6645 | sce->set_storage_does_not_escape(); | |
6646 | call = Runtime::make_call(Runtime::CONCATSTRINGS, loc, 2, nil_arg, | |
6647 | sce); | |
6648 | } | |
6649 | break; | |
6650 | } | |
6651 | ||
6652 | return Expression::make_cast(type, call, loc); | |
6653 | } | |
6654 | ||
6655 | void | |
6656 | String_concat_expression::do_dump_expression( | |
6657 | Ast_dump_context* ast_dump_context) const | |
6658 | { | |
6659 | ast_dump_context->ostream() << "concat("; | |
6660 | ast_dump_context->dump_expression_list(this->exprs_, false); | |
6661 | ast_dump_context->ostream() << ")"; | |
6662 | } | |
6663 | ||
6664 | Expression* | |
6665 | Expression::make_string_concat(Expression_list* exprs) | |
6666 | { | |
6667 | return new String_concat_expression(exprs); | |
6668 | } | |
6669 | ||
e440a328 | 6670 | // Class Bound_method_expression. |
6671 | ||
6672 | // Traversal. | |
6673 | ||
6674 | int | |
6675 | Bound_method_expression::do_traverse(Traverse* traverse) | |
6676 | { | |
e0659c9e | 6677 | return Expression::traverse(&this->expr_, traverse); |
e440a328 | 6678 | } |
6679 | ||
6680 | // Return the type of a bound method expression. The type of this | |
0afbb937 | 6681 | // object is simply the type of the method with no receiver. |
e440a328 | 6682 | |
6683 | Type* | |
6684 | Bound_method_expression::do_type() | |
6685 | { | |
0afbb937 | 6686 | Named_object* fn = this->method_->named_object(); |
6687 | Function_type* fntype; | |
6688 | if (fn->is_function()) | |
6689 | fntype = fn->func_value()->type(); | |
6690 | else if (fn->is_function_declaration()) | |
6691 | fntype = fn->func_declaration_value()->type(); | |
e0659c9e | 6692 | else |
6693 | return Type::make_error_type(); | |
0afbb937 | 6694 | return fntype->copy_without_receiver(); |
e440a328 | 6695 | } |
6696 | ||
6697 | // Determine the types of a method expression. | |
6698 | ||
6699 | void | |
6700 | Bound_method_expression::do_determine_type(const Type_context*) | |
6701 | { | |
0afbb937 | 6702 | Named_object* fn = this->method_->named_object(); |
6703 | Function_type* fntype; | |
6704 | if (fn->is_function()) | |
6705 | fntype = fn->func_value()->type(); | |
6706 | else if (fn->is_function_declaration()) | |
6707 | fntype = fn->func_declaration_value()->type(); | |
6708 | else | |
6709 | fntype = NULL; | |
e440a328 | 6710 | if (fntype == NULL || !fntype->is_method()) |
6711 | this->expr_->determine_type_no_context(); | |
6712 | else | |
6713 | { | |
6714 | Type_context subcontext(fntype->receiver()->type(), false); | |
6715 | this->expr_->determine_type(&subcontext); | |
6716 | } | |
6717 | } | |
6718 | ||
6719 | // Check the types of a method expression. | |
6720 | ||
6721 | void | |
6722 | Bound_method_expression::do_check_types(Gogo*) | |
6723 | { | |
0afbb937 | 6724 | Named_object* fn = this->method_->named_object(); |
6725 | if (!fn->is_function() && !fn->is_function_declaration()) | |
6726 | { | |
6727 | this->report_error(_("object is not a method")); | |
6728 | return; | |
6729 | } | |
6730 | ||
6731 | Function_type* fntype; | |
6732 | if (fn->is_function()) | |
6733 | fntype = fn->func_value()->type(); | |
6734 | else if (fn->is_function_declaration()) | |
6735 | fntype = fn->func_declaration_value()->type(); | |
e440a328 | 6736 | else |
0afbb937 | 6737 | go_unreachable(); |
6738 | Type* rtype = fntype->receiver()->type()->deref(); | |
6739 | Type* etype = (this->expr_type_ != NULL | |
6740 | ? this->expr_type_ | |
6741 | : this->expr_->type()); | |
6742 | etype = etype->deref(); | |
6743 | if (!Type::are_identical(rtype, etype, true, NULL)) | |
6744 | this->report_error(_("method type does not match object type")); | |
6745 | } | |
6746 | ||
6747 | // If a bound method expression is not simply called, then it is | |
6748 | // represented as a closure. The closure will hold a single variable, | |
6749 | // the receiver to pass to the method. The function will be a simple | |
6750 | // thunk that pulls that value from the closure and calls the method | |
6751 | // with the remaining arguments. | |
6752 | // | |
6753 | // Because method values are not common, we don't build all thunks for | |
6754 | // every methods, but instead only build them as we need them. In | |
6755 | // particular, we even build them on demand for methods defined in | |
6756 | // other packages. | |
6757 | ||
6758 | Bound_method_expression::Method_value_thunks | |
6759 | Bound_method_expression::method_value_thunks; | |
6760 | ||
6761 | // Find or create the thunk for METHOD. | |
6762 | ||
6763 | Named_object* | |
6764 | Bound_method_expression::create_thunk(Gogo* gogo, const Method* method, | |
6765 | Named_object* fn) | |
6766 | { | |
6767 | std::pair<Named_object*, Named_object*> val(fn, NULL); | |
6768 | std::pair<Method_value_thunks::iterator, bool> ins = | |
6769 | Bound_method_expression::method_value_thunks.insert(val); | |
6770 | if (!ins.second) | |
6771 | { | |
6772 | // We have seen this method before. | |
6773 | go_assert(ins.first->second != NULL); | |
6774 | return ins.first->second; | |
6775 | } | |
6776 | ||
6777 | Location loc = fn->location(); | |
6778 | ||
6779 | Function_type* orig_fntype; | |
6780 | if (fn->is_function()) | |
6781 | orig_fntype = fn->func_value()->type(); | |
6782 | else if (fn->is_function_declaration()) | |
6783 | orig_fntype = fn->func_declaration_value()->type(); | |
6784 | else | |
6785 | orig_fntype = NULL; | |
6786 | ||
6787 | if (orig_fntype == NULL || !orig_fntype->is_method()) | |
e440a328 | 6788 | { |
0afbb937 | 6789 | ins.first->second = Named_object::make_erroneous_name(Gogo::thunk_name()); |
6790 | return ins.first->second; | |
e440a328 | 6791 | } |
0afbb937 | 6792 | |
6793 | Struct_field_list* sfl = new Struct_field_list(); | |
f8bdf81a | 6794 | // The type here is wrong--it should be the C function type. But it |
6795 | // doesn't really matter. | |
0afbb937 | 6796 | Type* vt = Type::make_pointer_type(Type::make_void_type()); |
6797 | sfl->push_back(Struct_field(Typed_identifier("fn.0", vt, loc))); | |
6798 | sfl->push_back(Struct_field(Typed_identifier("val.1", | |
6799 | orig_fntype->receiver()->type(), | |
6800 | loc))); | |
6bf4793c | 6801 | Struct_type* st = Type::make_struct_type(sfl, loc); |
6802 | st->set_is_struct_incomparable(); | |
6803 | Type* closure_type = Type::make_pointer_type(st); | |
0afbb937 | 6804 | |
f8bdf81a | 6805 | Function_type* new_fntype = orig_fntype->copy_with_names(); |
0afbb937 | 6806 | |
da244e59 | 6807 | std::string thunk_name = Gogo::thunk_name(); |
6808 | Named_object* new_no = gogo->start_function(thunk_name, new_fntype, | |
0afbb937 | 6809 | false, loc); |
6810 | ||
f8bdf81a | 6811 | Variable* cvar = new Variable(closure_type, NULL, false, false, false, loc); |
6812 | cvar->set_is_used(); | |
1ecc6157 | 6813 | cvar->set_is_closure(); |
da244e59 | 6814 | Named_object* cp = Named_object::make_variable("$closure" + thunk_name, |
6815 | NULL, cvar); | |
f8bdf81a | 6816 | new_no->func_value()->set_closure_var(cp); |
0afbb937 | 6817 | |
f8bdf81a | 6818 | gogo->start_block(loc); |
0afbb937 | 6819 | |
6820 | // Field 0 of the closure is the function code pointer, field 1 is | |
6821 | // the value on which to invoke the method. | |
6822 | Expression* arg = Expression::make_var_reference(cp, loc); | |
6823 | arg = Expression::make_unary(OPERATOR_MULT, arg, loc); | |
6824 | arg = Expression::make_field_reference(arg, 1, loc); | |
6825 | ||
6826 | Expression* bme = Expression::make_bound_method(arg, method, fn, loc); | |
6827 | ||
6828 | const Typed_identifier_list* orig_params = orig_fntype->parameters(); | |
6829 | Expression_list* args; | |
6830 | if (orig_params == NULL || orig_params->empty()) | |
6831 | args = NULL; | |
6832 | else | |
6833 | { | |
6834 | const Typed_identifier_list* new_params = new_fntype->parameters(); | |
6835 | args = new Expression_list(); | |
6836 | for (Typed_identifier_list::const_iterator p = new_params->begin(); | |
f8bdf81a | 6837 | p != new_params->end(); |
0afbb937 | 6838 | ++p) |
6839 | { | |
6840 | Named_object* p_no = gogo->lookup(p->name(), NULL); | |
6841 | go_assert(p_no != NULL | |
6842 | && p_no->is_variable() | |
6843 | && p_no->var_value()->is_parameter()); | |
6844 | args->push_back(Expression::make_var_reference(p_no, loc)); | |
6845 | } | |
6846 | } | |
6847 | ||
6848 | Call_expression* call = Expression::make_call(bme, args, | |
6849 | orig_fntype->is_varargs(), | |
6850 | loc); | |
6851 | call->set_varargs_are_lowered(); | |
6852 | ||
6853 | Statement* s = Statement::make_return_from_call(call, loc); | |
6854 | gogo->add_statement(s); | |
6855 | Block* b = gogo->finish_block(loc); | |
6856 | gogo->add_block(b, loc); | |
6857 | gogo->lower_block(new_no, b); | |
a32698ee | 6858 | gogo->flatten_block(new_no, b); |
0afbb937 | 6859 | gogo->finish_function(loc); |
6860 | ||
6861 | ins.first->second = new_no; | |
6862 | return new_no; | |
6863 | } | |
6864 | ||
6865 | // Return an expression to check *REF for nil while dereferencing | |
6866 | // according to FIELD_INDEXES. Update *REF to build up the field | |
6867 | // reference. This is a static function so that we don't have to | |
6868 | // worry about declaring Field_indexes in expressions.h. | |
6869 | ||
6870 | static Expression* | |
6871 | bme_check_nil(const Method::Field_indexes* field_indexes, Location loc, | |
6872 | Expression** ref) | |
6873 | { | |
6874 | if (field_indexes == NULL) | |
6875 | return Expression::make_boolean(false, loc); | |
6876 | Expression* cond = bme_check_nil(field_indexes->next, loc, ref); | |
6877 | Struct_type* stype = (*ref)->type()->deref()->struct_type(); | |
6878 | go_assert(stype != NULL | |
6879 | && field_indexes->field_index < stype->field_count()); | |
6880 | if ((*ref)->type()->struct_type() == NULL) | |
6881 | { | |
6882 | go_assert((*ref)->type()->points_to() != NULL); | |
6883 | Expression* n = Expression::make_binary(OPERATOR_EQEQ, *ref, | |
6884 | Expression::make_nil(loc), | |
6885 | loc); | |
6886 | cond = Expression::make_binary(OPERATOR_OROR, cond, n, loc); | |
6887 | *ref = Expression::make_unary(OPERATOR_MULT, *ref, loc); | |
6888 | go_assert((*ref)->type()->struct_type() == stype); | |
6889 | } | |
6890 | *ref = Expression::make_field_reference(*ref, field_indexes->field_index, | |
6891 | loc); | |
6892 | return cond; | |
e440a328 | 6893 | } |
6894 | ||
cd39797e | 6895 | // Flatten a method value into a struct with nil checks. We can't do |
6896 | // this in the lowering phase, because if the method value is called | |
6897 | // directly we don't need a thunk. That case will have been handled | |
6898 | // by Call_expression::do_lower, so if we get here then we do need a | |
6899 | // thunk. | |
e440a328 | 6900 | |
cd39797e | 6901 | Expression* |
6902 | Bound_method_expression::do_flatten(Gogo* gogo, Named_object*, | |
6903 | Statement_inserter* inserter) | |
e440a328 | 6904 | { |
cd39797e | 6905 | Location loc = this->location(); |
6906 | ||
6907 | Named_object* thunk = Bound_method_expression::create_thunk(gogo, | |
0afbb937 | 6908 | this->method_, |
6909 | this->function_); | |
6910 | if (thunk->is_erroneous()) | |
6911 | { | |
6912 | go_assert(saw_errors()); | |
cd39797e | 6913 | return Expression::make_error(loc); |
0afbb937 | 6914 | } |
6915 | ||
cd39797e | 6916 | // Force the expression into a variable. This is only necessary if |
6917 | // we are going to do nil checks below, but it's easy enough to | |
6918 | // always do it. | |
6919 | Expression* expr = this->expr_; | |
6920 | if (!expr->is_variable()) | |
6921 | { | |
6922 | Temporary_statement* etemp = Statement::make_temporary(NULL, expr, loc); | |
6923 | inserter->insert(etemp); | |
6924 | expr = Expression::make_temporary_reference(etemp, loc); | |
6925 | } | |
0afbb937 | 6926 | |
6927 | // If the method expects a value, and we have a pointer, we need to | |
6928 | // dereference the pointer. | |
6929 | ||
6930 | Named_object* fn = this->method_->named_object(); | |
cd39797e | 6931 | Function_type *fntype; |
0afbb937 | 6932 | if (fn->is_function()) |
6933 | fntype = fn->func_value()->type(); | |
6934 | else if (fn->is_function_declaration()) | |
6935 | fntype = fn->func_declaration_value()->type(); | |
6936 | else | |
6937 | go_unreachable(); | |
6938 | ||
cd39797e | 6939 | Expression* val = expr; |
0afbb937 | 6940 | if (fntype->receiver()->type()->points_to() == NULL |
6941 | && val->type()->points_to() != NULL) | |
6942 | val = Expression::make_unary(OPERATOR_MULT, val, loc); | |
6943 | ||
6944 | // Note that we are ignoring this->expr_type_ here. The thunk will | |
6945 | // expect a closure whose second field has type this->expr_type_ (if | |
6946 | // that is not NULL). We are going to pass it a closure whose | |
6947 | // second field has type this->expr_->type(). Since | |
6948 | // this->expr_type_ is only not-NULL for pointer types, we can get | |
6949 | // away with this. | |
6950 | ||
6951 | Struct_field_list* fields = new Struct_field_list(); | |
6952 | fields->push_back(Struct_field(Typed_identifier("fn.0", | |
6953 | thunk->func_value()->type(), | |
6954 | loc))); | |
6955 | fields->push_back(Struct_field(Typed_identifier("val.1", val->type(), loc))); | |
6956 | Struct_type* st = Type::make_struct_type(fields, loc); | |
6bf4793c | 6957 | st->set_is_struct_incomparable(); |
0afbb937 | 6958 | |
6959 | Expression_list* vals = new Expression_list(); | |
6960 | vals->push_back(Expression::make_func_code_reference(thunk, loc)); | |
6961 | vals->push_back(val); | |
6962 | ||
6963 | Expression* ret = Expression::make_struct_composite_literal(st, vals, loc); | |
0afbb937 | 6964 | |
cd39797e | 6965 | if (!gogo->compiling_runtime() || gogo->package_name() != "runtime") |
6966 | ret = Expression::make_heap_expression(ret, loc); | |
6967 | else | |
6968 | { | |
6969 | // When compiling the runtime, method closures do not escape. | |
6970 | // When escape analysis becomes the default, and applies to | |
6971 | // method closures, this should be changed to make it an error | |
6972 | // if a method closure escapes. | |
6973 | Temporary_statement* ctemp = Statement::make_temporary(st, ret, loc); | |
6974 | inserter->insert(ctemp); | |
6975 | ret = Expression::make_temporary_reference(ctemp, loc); | |
6976 | ret = Expression::make_unary(OPERATOR_AND, ret, loc); | |
6977 | ret->unary_expression()->set_does_not_escape(); | |
6978 | } | |
6979 | ||
6980 | // If necessary, check whether the expression or any embedded | |
6981 | // pointers are nil. | |
0afbb937 | 6982 | |
df7ef1fd | 6983 | Expression* nil_check = NULL; |
0afbb937 | 6984 | if (this->method_->field_indexes() != NULL) |
6985 | { | |
0afbb937 | 6986 | Expression* ref = expr; |
6987 | nil_check = bme_check_nil(this->method_->field_indexes(), loc, &ref); | |
6988 | expr = ref; | |
6989 | } | |
6990 | ||
6991 | if (this->method_->is_value_method() && expr->type()->points_to() != NULL) | |
6992 | { | |
6993 | Expression* n = Expression::make_binary(OPERATOR_EQEQ, expr, | |
6994 | Expression::make_nil(loc), | |
6995 | loc); | |
6996 | if (nil_check == NULL) | |
6997 | nil_check = n; | |
6998 | else | |
6999 | nil_check = Expression::make_binary(OPERATOR_OROR, nil_check, n, loc); | |
7000 | } | |
7001 | ||
7002 | if (nil_check != NULL) | |
7003 | { | |
cd39797e | 7004 | Expression* crash = gogo->runtime_error(RUNTIME_ERROR_NIL_DEREFERENCE, |
7005 | loc); | |
7006 | // Fix the type of the conditional expression by pretending to | |
7007 | // evaluate to RET either way through the conditional. | |
7008 | crash = Expression::make_compound(crash, ret, loc); | |
7009 | ret = Expression::make_conditional(nil_check, crash, ret, loc); | |
7010 | } | |
7011 | ||
7012 | // RET is a pointer to a struct, but we want a function type. | |
7013 | ret = Expression::make_unsafe_cast(this->type(), ret, loc); | |
7014 | ||
7015 | return ret; | |
e440a328 | 7016 | } |
7017 | ||
d751bb78 | 7018 | // Dump ast representation of a bound method expression. |
7019 | ||
7020 | void | |
7021 | Bound_method_expression::do_dump_expression(Ast_dump_context* ast_dump_context) | |
7022 | const | |
7023 | { | |
7024 | if (this->expr_type_ != NULL) | |
7025 | ast_dump_context->ostream() << "("; | |
7026 | ast_dump_context->dump_expression(this->expr_); | |
7027 | if (this->expr_type_ != NULL) | |
7028 | { | |
7029 | ast_dump_context->ostream() << ":"; | |
7030 | ast_dump_context->dump_type(this->expr_type_); | |
7031 | ast_dump_context->ostream() << ")"; | |
7032 | } | |
7033 | ||
0afbb937 | 7034 | ast_dump_context->ostream() << "." << this->function_->name(); |
d751bb78 | 7035 | } |
7036 | ||
e440a328 | 7037 | // Make a method expression. |
7038 | ||
7039 | Bound_method_expression* | |
0afbb937 | 7040 | Expression::make_bound_method(Expression* expr, const Method* method, |
7041 | Named_object* function, Location location) | |
e440a328 | 7042 | { |
0afbb937 | 7043 | return new Bound_method_expression(expr, method, function, location); |
e440a328 | 7044 | } |
7045 | ||
7046 | // Class Builtin_call_expression. This is used for a call to a | |
7047 | // builtin function. | |
7048 | ||
7049 | class Builtin_call_expression : public Call_expression | |
7050 | { | |
7051 | public: | |
7052 | Builtin_call_expression(Gogo* gogo, Expression* fn, Expression_list* args, | |
b13c66cd | 7053 | bool is_varargs, Location location); |
e440a328 | 7054 | |
7055 | protected: | |
7056 | // This overrides Call_expression::do_lower. | |
7057 | Expression* | |
ceeb4318 | 7058 | do_lower(Gogo*, Named_object*, Statement_inserter*, int); |
e440a328 | 7059 | |
35a54f17 | 7060 | Expression* |
7061 | do_flatten(Gogo*, Named_object*, Statement_inserter*); | |
7062 | ||
e440a328 | 7063 | bool |
7064 | do_is_constant() const; | |
7065 | ||
7066 | bool | |
0c77715b | 7067 | do_numeric_constant_value(Numeric_constant*) const; |
e440a328 | 7068 | |
4f2138d7 | 7069 | bool |
a7549a6a | 7070 | do_discarding_value(); |
7071 | ||
e440a328 | 7072 | Type* |
7073 | do_type(); | |
7074 | ||
7075 | void | |
7076 | do_determine_type(const Type_context*); | |
7077 | ||
7078 | void | |
7079 | do_check_types(Gogo*); | |
7080 | ||
7081 | Expression* | |
72666aed | 7082 | do_copy(); |
e440a328 | 7083 | |
ea664253 | 7084 | Bexpression* |
7085 | do_get_backend(Translate_context*); | |
e440a328 | 7086 | |
7087 | void | |
7088 | do_export(Export*) const; | |
7089 | ||
7090 | virtual bool | |
7091 | do_is_recover_call() const; | |
7092 | ||
7093 | virtual void | |
7094 | do_set_recover_arg(Expression*); | |
7095 | ||
7096 | private: | |
7097 | // The builtin functions. | |
7098 | enum Builtin_function_code | |
7099 | { | |
7100 | BUILTIN_INVALID, | |
7101 | ||
7102 | // Predeclared builtin functions. | |
7103 | BUILTIN_APPEND, | |
7104 | BUILTIN_CAP, | |
7105 | BUILTIN_CLOSE, | |
48080209 | 7106 | BUILTIN_COMPLEX, |
e440a328 | 7107 | BUILTIN_COPY, |
1cce762f | 7108 | BUILTIN_DELETE, |
e440a328 | 7109 | BUILTIN_IMAG, |
7110 | BUILTIN_LEN, | |
7111 | BUILTIN_MAKE, | |
7112 | BUILTIN_NEW, | |
7113 | BUILTIN_PANIC, | |
7114 | BUILTIN_PRINT, | |
7115 | BUILTIN_PRINTLN, | |
7116 | BUILTIN_REAL, | |
7117 | BUILTIN_RECOVER, | |
7118 | ||
7119 | // Builtin functions from the unsafe package. | |
7120 | BUILTIN_ALIGNOF, | |
7121 | BUILTIN_OFFSETOF, | |
7122 | BUILTIN_SIZEOF | |
7123 | }; | |
7124 | ||
7125 | Expression* | |
7126 | one_arg() const; | |
7127 | ||
7128 | bool | |
7129 | check_one_arg(); | |
7130 | ||
7131 | static Type* | |
7132 | real_imag_type(Type*); | |
7133 | ||
7134 | static Type* | |
48080209 | 7135 | complex_type(Type*); |
e440a328 | 7136 | |
a9182619 | 7137 | Expression* |
321e5ad2 | 7138 | lower_make(Statement_inserter*); |
7139 | ||
7140 | Expression* flatten_append(Gogo*, Named_object*, Statement_inserter*); | |
a9182619 | 7141 | |
7142 | bool | |
ccea2b36 | 7143 | check_int_value(Expression*, bool is_length, bool* small); |
a9182619 | 7144 | |
e440a328 | 7145 | // A pointer back to the general IR structure. This avoids a global |
7146 | // variable, or passing it around everywhere. | |
7147 | Gogo* gogo_; | |
7148 | // The builtin function being called. | |
7149 | Builtin_function_code code_; | |
0f914071 | 7150 | // Used to stop endless loops when the length of an array uses len |
7151 | // or cap of the array itself. | |
7152 | mutable bool seen_; | |
6334270b | 7153 | // Whether the argument is set for calls to BUILTIN_RECOVER. |
7154 | bool recover_arg_is_set_; | |
e440a328 | 7155 | }; |
7156 | ||
7157 | Builtin_call_expression::Builtin_call_expression(Gogo* gogo, | |
7158 | Expression* fn, | |
7159 | Expression_list* args, | |
7160 | bool is_varargs, | |
b13c66cd | 7161 | Location location) |
e440a328 | 7162 | : Call_expression(fn, args, is_varargs, location), |
6334270b | 7163 | gogo_(gogo), code_(BUILTIN_INVALID), seen_(false), |
7164 | recover_arg_is_set_(false) | |
e440a328 | 7165 | { |
7166 | Func_expression* fnexp = this->fn()->func_expression(); | |
79651b1f | 7167 | if (fnexp == NULL) |
7168 | { | |
7169 | this->code_ = BUILTIN_INVALID; | |
7170 | return; | |
7171 | } | |
e440a328 | 7172 | const std::string& name(fnexp->named_object()->name()); |
7173 | if (name == "append") | |
7174 | this->code_ = BUILTIN_APPEND; | |
7175 | else if (name == "cap") | |
7176 | this->code_ = BUILTIN_CAP; | |
7177 | else if (name == "close") | |
7178 | this->code_ = BUILTIN_CLOSE; | |
48080209 | 7179 | else if (name == "complex") |
7180 | this->code_ = BUILTIN_COMPLEX; | |
e440a328 | 7181 | else if (name == "copy") |
7182 | this->code_ = BUILTIN_COPY; | |
1cce762f | 7183 | else if (name == "delete") |
7184 | this->code_ = BUILTIN_DELETE; | |
e440a328 | 7185 | else if (name == "imag") |
7186 | this->code_ = BUILTIN_IMAG; | |
7187 | else if (name == "len") | |
7188 | this->code_ = BUILTIN_LEN; | |
7189 | else if (name == "make") | |
7190 | this->code_ = BUILTIN_MAKE; | |
7191 | else if (name == "new") | |
7192 | this->code_ = BUILTIN_NEW; | |
7193 | else if (name == "panic") | |
7194 | this->code_ = BUILTIN_PANIC; | |
7195 | else if (name == "print") | |
7196 | this->code_ = BUILTIN_PRINT; | |
7197 | else if (name == "println") | |
7198 | this->code_ = BUILTIN_PRINTLN; | |
7199 | else if (name == "real") | |
7200 | this->code_ = BUILTIN_REAL; | |
7201 | else if (name == "recover") | |
7202 | this->code_ = BUILTIN_RECOVER; | |
7203 | else if (name == "Alignof") | |
7204 | this->code_ = BUILTIN_ALIGNOF; | |
7205 | else if (name == "Offsetof") | |
7206 | this->code_ = BUILTIN_OFFSETOF; | |
7207 | else if (name == "Sizeof") | |
7208 | this->code_ = BUILTIN_SIZEOF; | |
7209 | else | |
c3e6f413 | 7210 | go_unreachable(); |
e440a328 | 7211 | } |
7212 | ||
7213 | // Return whether this is a call to recover. This is a virtual | |
7214 | // function called from the parent class. | |
7215 | ||
7216 | bool | |
7217 | Builtin_call_expression::do_is_recover_call() const | |
7218 | { | |
7219 | if (this->classification() == EXPRESSION_ERROR) | |
7220 | return false; | |
7221 | return this->code_ == BUILTIN_RECOVER; | |
7222 | } | |
7223 | ||
7224 | // Set the argument for a call to recover. | |
7225 | ||
7226 | void | |
7227 | Builtin_call_expression::do_set_recover_arg(Expression* arg) | |
7228 | { | |
7229 | const Expression_list* args = this->args(); | |
c484d925 | 7230 | go_assert(args == NULL || args->empty()); |
e440a328 | 7231 | Expression_list* new_args = new Expression_list(); |
7232 | new_args->push_back(arg); | |
7233 | this->set_args(new_args); | |
6334270b | 7234 | this->recover_arg_is_set_ = true; |
e440a328 | 7235 | } |
7236 | ||
e440a328 | 7237 | // Lower a builtin call expression. This turns new and make into |
7238 | // specific expressions. We also convert to a constant if we can. | |
7239 | ||
7240 | Expression* | |
321e5ad2 | 7241 | Builtin_call_expression::do_lower(Gogo*, Named_object* function, |
ceeb4318 | 7242 | Statement_inserter* inserter, int) |
e440a328 | 7243 | { |
79651b1f | 7244 | if (this->is_error_expression()) |
a9182619 | 7245 | return this; |
7246 | ||
b13c66cd | 7247 | Location loc = this->location(); |
1cce762f | 7248 | |
a8725655 | 7249 | if (this->is_varargs() && this->code_ != BUILTIN_APPEND) |
7250 | { | |
7251 | this->report_error(_("invalid use of %<...%> with builtin function")); | |
1cce762f | 7252 | return Expression::make_error(loc); |
a8725655 | 7253 | } |
7254 | ||
393ba00b | 7255 | if (this->code_ == BUILTIN_OFFSETOF) |
7256 | { | |
7257 | Expression* arg = this->one_arg(); | |
12e69faa | 7258 | |
7259 | if (arg->bound_method_expression() != NULL | |
7260 | || arg->interface_field_reference_expression() != NULL) | |
7261 | { | |
7262 | this->report_error(_("invalid use of method value as argument " | |
7263 | "of Offsetof")); | |
7264 | return this; | |
7265 | } | |
7266 | ||
393ba00b | 7267 | Field_reference_expression* farg = arg->field_reference_expression(); |
7268 | while (farg != NULL) | |
7269 | { | |
7270 | if (!farg->implicit()) | |
7271 | break; | |
7272 | // When the selector refers to an embedded field, | |
7273 | // it must not be reached through pointer indirections. | |
7274 | if (farg->expr()->deref() != farg->expr()) | |
7275 | { | |
12e69faa | 7276 | this->report_error(_("argument of Offsetof implies " |
7277 | "indirection of an embedded field")); | |
393ba00b | 7278 | return this; |
7279 | } | |
7280 | // Go up until we reach the original base. | |
7281 | farg = farg->expr()->field_reference_expression(); | |
7282 | } | |
7283 | } | |
7284 | ||
1cce762f | 7285 | if (this->is_constant()) |
e440a328 | 7286 | { |
0c77715b | 7287 | Numeric_constant nc; |
7288 | if (this->numeric_constant_value(&nc)) | |
7289 | return nc.expression(loc); | |
e440a328 | 7290 | } |
1cce762f | 7291 | |
7292 | switch (this->code_) | |
e440a328 | 7293 | { |
1cce762f | 7294 | default: |
7295 | break; | |
7296 | ||
7297 | case BUILTIN_NEW: | |
7298 | { | |
7299 | const Expression_list* args = this->args(); | |
7300 | if (args == NULL || args->size() < 1) | |
7301 | this->report_error(_("not enough arguments")); | |
7302 | else if (args->size() > 1) | |
7303 | this->report_error(_("too many arguments")); | |
7304 | else | |
7305 | { | |
7306 | Expression* arg = args->front(); | |
7307 | if (!arg->is_type_expression()) | |
7308 | { | |
631d5788 | 7309 | go_error_at(arg->location(), "expected type"); |
1cce762f | 7310 | this->set_is_error(); |
7311 | } | |
7312 | else | |
7313 | return Expression::make_allocation(arg->type(), loc); | |
7314 | } | |
7315 | } | |
7316 | break; | |
7317 | ||
7318 | case BUILTIN_MAKE: | |
321e5ad2 | 7319 | return this->lower_make(inserter); |
1cce762f | 7320 | |
7321 | case BUILTIN_RECOVER: | |
e440a328 | 7322 | if (function != NULL) |
7323 | function->func_value()->set_calls_recover(); | |
7324 | else | |
7325 | { | |
7326 | // Calling recover outside of a function always returns the | |
7327 | // nil empty interface. | |
823c7e3d | 7328 | Type* eface = Type::make_empty_interface_type(loc); |
1cce762f | 7329 | return Expression::make_cast(eface, Expression::make_nil(loc), loc); |
e440a328 | 7330 | } |
1cce762f | 7331 | break; |
7332 | ||
1cce762f | 7333 | case BUILTIN_DELETE: |
7334 | { | |
7335 | // Lower to a runtime function call. | |
7336 | const Expression_list* args = this->args(); | |
7337 | if (args == NULL || args->size() < 2) | |
7338 | this->report_error(_("not enough arguments")); | |
7339 | else if (args->size() > 2) | |
7340 | this->report_error(_("too many arguments")); | |
7341 | else if (args->front()->type()->map_type() == NULL) | |
7342 | this->report_error(_("argument 1 must be a map")); | |
7343 | else | |
7344 | { | |
7345 | // Since this function returns no value it must appear in | |
7346 | // a statement by itself, so we don't have to worry about | |
7347 | // order of evaluation of values around it. Evaluate the | |
7348 | // map first to get order of evaluation right. | |
7349 | Map_type* mt = args->front()->type()->map_type(); | |
7350 | Temporary_statement* map_temp = | |
7351 | Statement::make_temporary(mt, args->front(), loc); | |
7352 | inserter->insert(map_temp); | |
7353 | ||
7354 | Temporary_statement* key_temp = | |
7355 | Statement::make_temporary(mt->key_type(), args->back(), loc); | |
7356 | inserter->insert(key_temp); | |
7357 | ||
0d5530d9 | 7358 | Expression* e1 = Expression::make_type_descriptor(mt, loc); |
7359 | Expression* e2 = Expression::make_temporary_reference(map_temp, | |
1cce762f | 7360 | loc); |
0d5530d9 | 7361 | Expression* e3 = Expression::make_temporary_reference(key_temp, |
1cce762f | 7362 | loc); |
0d5530d9 | 7363 | e3 = Expression::make_unary(OPERATOR_AND, e3, loc); |
1cce762f | 7364 | return Runtime::make_call(Runtime::MAPDELETE, this->location(), |
0d5530d9 | 7365 | 3, e1, e2, e3); |
1cce762f | 7366 | } |
7367 | } | |
7368 | break; | |
88b03a70 | 7369 | |
7370 | case BUILTIN_PRINT: | |
7371 | case BUILTIN_PRINTLN: | |
7372 | // Force all the arguments into temporary variables, so that we | |
7373 | // don't try to evaluate something while holding the print lock. | |
7374 | if (this->args() == NULL) | |
7375 | break; | |
7376 | for (Expression_list::iterator pa = this->args()->begin(); | |
7377 | pa != this->args()->end(); | |
7378 | ++pa) | |
7379 | { | |
493ce3ee | 7380 | if (!(*pa)->is_variable() && !(*pa)->is_constant()) |
88b03a70 | 7381 | { |
7382 | Temporary_statement* temp = | |
7383 | Statement::make_temporary(NULL, *pa, loc); | |
7384 | inserter->insert(temp); | |
7385 | *pa = Expression::make_temporary_reference(temp, loc); | |
7386 | } | |
7387 | } | |
7388 | break; | |
e440a328 | 7389 | } |
7390 | ||
7391 | return this; | |
7392 | } | |
7393 | ||
35a54f17 | 7394 | // Flatten a builtin call expression. This turns the arguments of copy and |
7395 | // append into temporary expressions. | |
7396 | ||
7397 | Expression* | |
321e5ad2 | 7398 | Builtin_call_expression::do_flatten(Gogo* gogo, Named_object* function, |
35a54f17 | 7399 | Statement_inserter* inserter) |
7400 | { | |
16cb7fec | 7401 | Location loc = this->location(); |
7402 | ||
7403 | switch (this->code_) | |
35a54f17 | 7404 | { |
16cb7fec | 7405 | default: |
7406 | break; | |
7407 | ||
7408 | case BUILTIN_APPEND: | |
321e5ad2 | 7409 | return this->flatten_append(gogo, function, inserter); |
7410 | ||
16cb7fec | 7411 | case BUILTIN_COPY: |
7412 | { | |
7413 | Type* at = this->args()->front()->type(); | |
7414 | for (Expression_list::iterator pa = this->args()->begin(); | |
7415 | pa != this->args()->end(); | |
7416 | ++pa) | |
7417 | { | |
7418 | if ((*pa)->is_nil_expression()) | |
7419 | { | |
7420 | Expression* nil = Expression::make_nil(loc); | |
7421 | Expression* zero = Expression::make_integer_ul(0, NULL, loc); | |
7422 | *pa = Expression::make_slice_value(at, nil, zero, zero, loc); | |
7423 | } | |
7424 | if (!(*pa)->is_variable()) | |
7425 | { | |
7426 | Temporary_statement* temp = | |
7427 | Statement::make_temporary(NULL, *pa, loc); | |
7428 | inserter->insert(temp); | |
7429 | *pa = Expression::make_temporary_reference(temp, loc); | |
7430 | } | |
7431 | } | |
7432 | } | |
7433 | break; | |
7434 | ||
7435 | case BUILTIN_PANIC: | |
35a54f17 | 7436 | for (Expression_list::iterator pa = this->args()->begin(); |
16cb7fec | 7437 | pa != this->args()->end(); |
7438 | ++pa) | |
7439 | { | |
7440 | if (!(*pa)->is_variable() && (*pa)->type()->interface_type() != NULL) | |
55e8ba6a | 7441 | { |
16cb7fec | 7442 | Temporary_statement* temp = |
7443 | Statement::make_temporary(NULL, *pa, loc); | |
7444 | inserter->insert(temp); | |
7445 | *pa = Expression::make_temporary_reference(temp, loc); | |
55e8ba6a | 7446 | } |
16cb7fec | 7447 | } |
7739537f | 7448 | break; |
0d5530d9 | 7449 | |
7450 | case BUILTIN_LEN: | |
132ed071 | 7451 | case BUILTIN_CAP: |
321e5ad2 | 7452 | { |
7453 | Expression_list::iterator pa = this->args()->begin(); | |
7454 | if (!(*pa)->is_variable() | |
7455 | && ((*pa)->type()->map_type() != NULL | |
7456 | || (*pa)->type()->channel_type() != NULL)) | |
7457 | { | |
7458 | Temporary_statement* temp = | |
7459 | Statement::make_temporary(NULL, *pa, loc); | |
7460 | inserter->insert(temp); | |
7461 | *pa = Expression::make_temporary_reference(temp, loc); | |
7462 | } | |
7463 | } | |
7464 | break; | |
35a54f17 | 7465 | } |
16cb7fec | 7466 | |
35a54f17 | 7467 | return this; |
7468 | } | |
7469 | ||
a9182619 | 7470 | // Lower a make expression. |
7471 | ||
7472 | Expression* | |
321e5ad2 | 7473 | Builtin_call_expression::lower_make(Statement_inserter* inserter) |
a9182619 | 7474 | { |
b13c66cd | 7475 | Location loc = this->location(); |
a9182619 | 7476 | |
7477 | const Expression_list* args = this->args(); | |
7478 | if (args == NULL || args->size() < 1) | |
7479 | { | |
7480 | this->report_error(_("not enough arguments")); | |
7481 | return Expression::make_error(this->location()); | |
7482 | } | |
7483 | ||
7484 | Expression_list::const_iterator parg = args->begin(); | |
7485 | ||
7486 | Expression* first_arg = *parg; | |
7487 | if (!first_arg->is_type_expression()) | |
7488 | { | |
631d5788 | 7489 | go_error_at(first_arg->location(), "expected type"); |
a9182619 | 7490 | this->set_is_error(); |
7491 | return Expression::make_error(this->location()); | |
7492 | } | |
7493 | Type* type = first_arg->type(); | |
7494 | ||
7495 | bool is_slice = false; | |
7496 | bool is_map = false; | |
7497 | bool is_chan = false; | |
411eb89e | 7498 | if (type->is_slice_type()) |
a9182619 | 7499 | is_slice = true; |
7500 | else if (type->map_type() != NULL) | |
7501 | is_map = true; | |
7502 | else if (type->channel_type() != NULL) | |
7503 | is_chan = true; | |
7504 | else | |
7505 | { | |
7506 | this->report_error(_("invalid type for make function")); | |
7507 | return Expression::make_error(this->location()); | |
7508 | } | |
7509 | ||
f6bc81e6 | 7510 | Type_context int_context(Type::lookup_integer_type("int"), false); |
7511 | ||
a9182619 | 7512 | ++parg; |
7513 | Expression* len_arg; | |
ccea2b36 | 7514 | bool len_small = false; |
a9182619 | 7515 | if (parg == args->end()) |
7516 | { | |
7517 | if (is_slice) | |
7518 | { | |
7519 | this->report_error(_("length required when allocating a slice")); | |
7520 | return Expression::make_error(this->location()); | |
7521 | } | |
e67508fa | 7522 | len_arg = Expression::make_integer_ul(0, NULL, loc); |
a9182619 | 7523 | } |
7524 | else | |
7525 | { | |
7526 | len_arg = *parg; | |
f6bc81e6 | 7527 | len_arg->determine_type(&int_context); |
ccea2b36 | 7528 | if (!this->check_int_value(len_arg, true, &len_small)) |
1ad00fd4 | 7529 | return Expression::make_error(this->location()); |
a9182619 | 7530 | ++parg; |
7531 | } | |
7532 | ||
7533 | Expression* cap_arg = NULL; | |
ccea2b36 | 7534 | bool cap_small = false; |
a9182619 | 7535 | if (is_slice && parg != args->end()) |
7536 | { | |
7537 | cap_arg = *parg; | |
f6bc81e6 | 7538 | cap_arg->determine_type(&int_context); |
ccea2b36 | 7539 | if (!this->check_int_value(cap_arg, false, &cap_small)) |
1ad00fd4 | 7540 | return Expression::make_error(this->location()); |
7541 | ||
7542 | Numeric_constant nclen; | |
7543 | Numeric_constant nccap; | |
7544 | unsigned long vlen; | |
7545 | unsigned long vcap; | |
7546 | if (len_arg->numeric_constant_value(&nclen) | |
7547 | && cap_arg->numeric_constant_value(&nccap) | |
7548 | && nclen.to_unsigned_long(&vlen) == Numeric_constant::NC_UL_VALID | |
7549 | && nccap.to_unsigned_long(&vcap) == Numeric_constant::NC_UL_VALID | |
7550 | && vlen > vcap) | |
a9182619 | 7551 | { |
1ad00fd4 | 7552 | this->report_error(_("len larger than cap")); |
a9182619 | 7553 | return Expression::make_error(this->location()); |
7554 | } | |
1ad00fd4 | 7555 | |
a9182619 | 7556 | ++parg; |
7557 | } | |
7558 | ||
7559 | if (parg != args->end()) | |
7560 | { | |
7561 | this->report_error(_("too many arguments to make")); | |
7562 | return Expression::make_error(this->location()); | |
7563 | } | |
7564 | ||
b13c66cd | 7565 | Location type_loc = first_arg->location(); |
a9182619 | 7566 | |
7567 | Expression* call; | |
7568 | if (is_slice) | |
7569 | { | |
321e5ad2 | 7570 | Type* et = type->array_type()->element_type(); |
7571 | Expression* type_arg = Expression::make_type_descriptor(et, type_loc); | |
a9182619 | 7572 | if (cap_arg == NULL) |
321e5ad2 | 7573 | { |
7574 | Temporary_statement* temp = Statement::make_temporary(NULL, | |
7575 | len_arg, | |
7576 | loc); | |
7577 | inserter->insert(temp); | |
7578 | len_arg = Expression::make_temporary_reference(temp, loc); | |
7579 | cap_arg = Expression::make_temporary_reference(temp, loc); | |
ccea2b36 | 7580 | cap_small = len_small; |
321e5ad2 | 7581 | } |
ccea2b36 | 7582 | |
7583 | Runtime::Function code = Runtime::MAKESLICE; | |
7584 | if (!len_small || !cap_small) | |
7585 | code = Runtime::MAKESLICE64; | |
7586 | call = Runtime::make_call(code, loc, 3, type_arg, len_arg, cap_arg); | |
a9182619 | 7587 | } |
7588 | else if (is_map) | |
321e5ad2 | 7589 | { |
7590 | Expression* type_arg = Expression::make_type_descriptor(type, type_loc); | |
7591 | call = Runtime::make_call(Runtime::MAKEMAP, loc, 4, type_arg, len_arg, | |
7592 | Expression::make_nil(loc), | |
7593 | Expression::make_nil(loc)); | |
7594 | } | |
a9182619 | 7595 | else if (is_chan) |
321e5ad2 | 7596 | { |
7597 | Expression* type_arg = Expression::make_type_descriptor(type, type_loc); | |
7598 | call = Runtime::make_call(Runtime::MAKECHAN, loc, 2, type_arg, len_arg); | |
7599 | } | |
a9182619 | 7600 | else |
7601 | go_unreachable(); | |
7602 | ||
7603 | return Expression::make_unsafe_cast(type, call, loc); | |
7604 | } | |
7605 | ||
321e5ad2 | 7606 | // Flatten a call to the predeclared append function. We do this in |
7607 | // the flatten phase, not the lowering phase, so that we run after | |
7608 | // type checking and after order_evaluations. | |
7609 | ||
7610 | Expression* | |
7611 | Builtin_call_expression::flatten_append(Gogo* gogo, Named_object* function, | |
7612 | Statement_inserter* inserter) | |
7613 | { | |
7614 | if (this->is_error_expression()) | |
7615 | return this; | |
7616 | ||
7617 | Location loc = this->location(); | |
7618 | ||
7619 | const Expression_list* args = this->args(); | |
7620 | go_assert(args != NULL && !args->empty()); | |
7621 | ||
7622 | Type* slice_type = args->front()->type(); | |
7623 | go_assert(slice_type->is_slice_type()); | |
7624 | Type* element_type = slice_type->array_type()->element_type(); | |
7625 | ||
7626 | if (args->size() == 1) | |
7627 | { | |
7628 | // append(s) evaluates to s. | |
7629 | return args->front(); | |
7630 | } | |
7631 | ||
7632 | Type* int_type = Type::lookup_integer_type("int"); | |
7633 | Type* uint_type = Type::lookup_integer_type("uint"); | |
7634 | ||
7635 | // Implementing | |
7636 | // append(s1, s2...) | |
7637 | // or | |
7638 | // append(s1, a1, a2, a3, ...) | |
7639 | ||
7640 | // s1tmp := s1 | |
7641 | Temporary_statement* s1tmp = Statement::make_temporary(NULL, args->front(), | |
7642 | loc); | |
7643 | inserter->insert(s1tmp); | |
7644 | ||
7645 | // l1tmp := len(s1tmp) | |
7646 | Named_object* lenfn = gogo->lookup_global("len"); | |
7647 | Expression* lenref = Expression::make_func_reference(lenfn, NULL, loc); | |
7648 | Expression_list* call_args = new Expression_list(); | |
7649 | call_args->push_back(Expression::make_temporary_reference(s1tmp, loc)); | |
7650 | Expression* len = Expression::make_call(lenref, call_args, false, loc); | |
7651 | gogo->lower_expression(function, inserter, &len); | |
7652 | gogo->flatten_expression(function, inserter, &len); | |
7653 | Temporary_statement* l1tmp = Statement::make_temporary(int_type, len, loc); | |
7654 | inserter->insert(l1tmp); | |
7655 | ||
7656 | Temporary_statement* s2tmp = NULL; | |
7657 | Temporary_statement* l2tmp = NULL; | |
7658 | Expression_list* add = NULL; | |
7659 | Expression* len2; | |
7660 | if (this->is_varargs()) | |
7661 | { | |
7662 | go_assert(args->size() == 2); | |
7663 | ||
7664 | // s2tmp := s2 | |
7665 | s2tmp = Statement::make_temporary(NULL, args->back(), loc); | |
7666 | inserter->insert(s2tmp); | |
7667 | ||
7668 | // l2tmp := len(s2tmp) | |
7669 | lenref = Expression::make_func_reference(lenfn, NULL, loc); | |
7670 | call_args = new Expression_list(); | |
7671 | call_args->push_back(Expression::make_temporary_reference(s2tmp, loc)); | |
7672 | len = Expression::make_call(lenref, call_args, false, loc); | |
7673 | gogo->lower_expression(function, inserter, &len); | |
7674 | gogo->flatten_expression(function, inserter, &len); | |
7675 | l2tmp = Statement::make_temporary(int_type, len, loc); | |
7676 | inserter->insert(l2tmp); | |
7677 | ||
7678 | // len2 = l2tmp | |
7679 | len2 = Expression::make_temporary_reference(l2tmp, loc); | |
7680 | } | |
7681 | else | |
7682 | { | |
7683 | // We have to ensure that all the arguments are in variables | |
7684 | // now, because otherwise if one of them is an index expression | |
7685 | // into the current slice we could overwrite it before we fetch | |
7686 | // it. | |
7687 | add = new Expression_list(); | |
7688 | Expression_list::const_iterator pa = args->begin(); | |
7689 | for (++pa; pa != args->end(); ++pa) | |
7690 | { | |
7691 | if ((*pa)->is_variable()) | |
7692 | add->push_back(*pa); | |
7693 | else | |
7694 | { | |
7695 | Temporary_statement* tmp = Statement::make_temporary(NULL, *pa, | |
7696 | loc); | |
7697 | inserter->insert(tmp); | |
7698 | add->push_back(Expression::make_temporary_reference(tmp, loc)); | |
7699 | } | |
7700 | } | |
7701 | ||
7702 | // len2 = len(add) | |
7703 | len2 = Expression::make_integer_ul(add->size(), int_type, loc); | |
7704 | } | |
7705 | ||
7706 | // ntmp := l1tmp + len2 | |
7707 | Expression* ref = Expression::make_temporary_reference(l1tmp, loc); | |
7708 | Expression* sum = Expression::make_binary(OPERATOR_PLUS, ref, len2, loc); | |
7709 | gogo->lower_expression(function, inserter, &sum); | |
7710 | gogo->flatten_expression(function, inserter, &sum); | |
7711 | Temporary_statement* ntmp = Statement::make_temporary(int_type, sum, loc); | |
7712 | inserter->insert(ntmp); | |
7713 | ||
7714 | // s1tmp = uint(ntmp) > uint(cap(s1tmp)) ? | |
7715 | // growslice(type, s1tmp, ntmp) : | |
7716 | // s1tmp[:ntmp] | |
7717 | // Using uint here means that if the computation of ntmp overflowed, | |
7718 | // we will call growslice which will panic. | |
7719 | ||
7720 | Expression* left = Expression::make_temporary_reference(ntmp, loc); | |
7721 | left = Expression::make_cast(uint_type, left, loc); | |
7722 | ||
7723 | Named_object* capfn = gogo->lookup_global("cap"); | |
7724 | Expression* capref = Expression::make_func_reference(capfn, NULL, loc); | |
7725 | call_args = new Expression_list(); | |
7726 | call_args->push_back(Expression::make_temporary_reference(s1tmp, loc)); | |
7727 | Expression* right = Expression::make_call(capref, call_args, false, loc); | |
7728 | right = Expression::make_cast(uint_type, right, loc); | |
7729 | ||
7730 | Expression* cond = Expression::make_binary(OPERATOR_GT, left, right, loc); | |
7731 | ||
7732 | Expression* a1 = Expression::make_type_descriptor(element_type, loc); | |
7733 | Expression* a2 = Expression::make_temporary_reference(s1tmp, loc); | |
7734 | Expression* a3 = Expression::make_temporary_reference(ntmp, loc); | |
7735 | Expression* call = Runtime::make_call(Runtime::GROWSLICE, loc, 3, | |
7736 | a1, a2, a3); | |
7737 | call = Expression::make_unsafe_cast(slice_type, call, loc); | |
7738 | ||
7739 | ref = Expression::make_temporary_reference(s1tmp, loc); | |
7740 | Expression* zero = Expression::make_integer_ul(0, int_type, loc); | |
7741 | Expression* ref2 = Expression::make_temporary_reference(ntmp, loc); | |
7742 | // FIXME: Mark this index as not requiring bounds checks. | |
7743 | ref = Expression::make_index(ref, zero, ref2, NULL, loc); | |
7744 | ||
7745 | Expression* rhs = Expression::make_conditional(cond, call, ref, loc); | |
7746 | ||
7747 | gogo->lower_expression(function, inserter, &rhs); | |
7748 | gogo->flatten_expression(function, inserter, &rhs); | |
7749 | ||
7750 | Expression* lhs = Expression::make_temporary_reference(s1tmp, loc); | |
7751 | Statement* assign = Statement::make_assignment(lhs, rhs, loc); | |
7752 | inserter->insert(assign); | |
7753 | ||
7754 | if (this->is_varargs()) | |
7755 | { | |
7756 | // copy(s1tmp[l1tmp:], s2tmp) | |
7757 | a1 = Expression::make_temporary_reference(s1tmp, loc); | |
7758 | ref = Expression::make_temporary_reference(l1tmp, loc); | |
7759 | Expression* nil = Expression::make_nil(loc); | |
7760 | // FIXME: Mark this index as not requiring bounds checks. | |
7761 | a1 = Expression::make_index(a1, ref, nil, NULL, loc); | |
7762 | ||
7763 | a2 = Expression::make_temporary_reference(s2tmp, loc); | |
7764 | ||
7765 | Named_object* copyfn = gogo->lookup_global("copy"); | |
7766 | Expression* copyref = Expression::make_func_reference(copyfn, NULL, loc); | |
7767 | call_args = new Expression_list(); | |
7768 | call_args->push_back(a1); | |
7769 | call_args->push_back(a2); | |
7770 | call = Expression::make_call(copyref, call_args, false, loc); | |
7771 | gogo->lower_expression(function, inserter, &call); | |
7772 | gogo->flatten_expression(function, inserter, &call); | |
7773 | inserter->insert(Statement::make_statement(call, false)); | |
7774 | } | |
7775 | else | |
7776 | { | |
7777 | // For each argument: | |
7778 | // s1tmp[l1tmp+i] = a | |
7779 | unsigned long i = 0; | |
7780 | for (Expression_list::const_iterator pa = add->begin(); | |
7781 | pa != add->end(); | |
7782 | ++pa, ++i) | |
7783 | { | |
7784 | ref = Expression::make_temporary_reference(s1tmp, loc); | |
7785 | ref2 = Expression::make_temporary_reference(l1tmp, loc); | |
7786 | Expression* off = Expression::make_integer_ul(i, int_type, loc); | |
7787 | ref2 = Expression::make_binary(OPERATOR_PLUS, ref2, off, loc); | |
7788 | // FIXME: Mark this index as not requiring bounds checks. | |
7789 | lhs = Expression::make_index(ref, ref2, NULL, NULL, loc); | |
7790 | gogo->lower_expression(function, inserter, &lhs); | |
7791 | gogo->flatten_expression(function, inserter, &lhs); | |
03118c21 | 7792 | // The flatten pass runs after the write barrier pass, so we |
7793 | // need to insert a write barrier here if necessary. | |
7794 | if (!gogo->assign_needs_write_barrier(lhs)) | |
7795 | assign = Statement::make_assignment(lhs, *pa, loc); | |
7796 | else | |
7797 | { | |
7798 | Function* f = function == NULL ? NULL : function->func_value(); | |
7799 | assign = gogo->assign_with_write_barrier(f, NULL, inserter, | |
7800 | lhs, *pa, loc); | |
7801 | } | |
321e5ad2 | 7802 | inserter->insert(assign); |
7803 | } | |
7804 | } | |
7805 | ||
7806 | return Expression::make_temporary_reference(s1tmp, loc); | |
7807 | } | |
7808 | ||
a9182619 | 7809 | // Return whether an expression has an integer value. Report an error |
7810 | // if not. This is used when handling calls to the predeclared make | |
ccea2b36 | 7811 | // function. Set *SMALL if the value is known to fit in type "int". |
a9182619 | 7812 | |
7813 | bool | |
ccea2b36 | 7814 | Builtin_call_expression::check_int_value(Expression* e, bool is_length, |
7815 | bool *small) | |
a9182619 | 7816 | { |
ccea2b36 | 7817 | *small = false; |
7818 | ||
0c77715b | 7819 | Numeric_constant nc; |
1ad00fd4 | 7820 | if (e->numeric_constant_value(&nc)) |
a9182619 | 7821 | { |
1ad00fd4 | 7822 | unsigned long v; |
7823 | switch (nc.to_unsigned_long(&v)) | |
7824 | { | |
7825 | case Numeric_constant::NC_UL_VALID: | |
1b10c5e7 | 7826 | break; |
1ad00fd4 | 7827 | case Numeric_constant::NC_UL_NOTINT: |
631d5788 | 7828 | go_error_at(e->location(), "non-integer %s argument to make", |
7829 | is_length ? "len" : "cap"); | |
1ad00fd4 | 7830 | return false; |
7831 | case Numeric_constant::NC_UL_NEGATIVE: | |
631d5788 | 7832 | go_error_at(e->location(), "negative %s argument to make", |
7833 | is_length ? "len" : "cap"); | |
1ad00fd4 | 7834 | return false; |
7835 | case Numeric_constant::NC_UL_BIG: | |
7836 | // We don't want to give a compile-time error for a 64-bit | |
7837 | // value on a 32-bit target. | |
1b10c5e7 | 7838 | break; |
1ad00fd4 | 7839 | } |
1b10c5e7 | 7840 | |
7841 | mpz_t val; | |
7842 | if (!nc.to_int(&val)) | |
7843 | go_unreachable(); | |
7844 | int bits = mpz_sizeinbase(val, 2); | |
7845 | mpz_clear(val); | |
7846 | Type* int_type = Type::lookup_integer_type("int"); | |
7847 | if (bits >= int_type->integer_type()->bits()) | |
7848 | { | |
631d5788 | 7849 | go_error_at(e->location(), "%s argument too large for make", |
7850 | is_length ? "len" : "cap"); | |
1b10c5e7 | 7851 | return false; |
7852 | } | |
7853 | ||
ccea2b36 | 7854 | *small = true; |
1b10c5e7 | 7855 | return true; |
a9182619 | 7856 | } |
7857 | ||
1ad00fd4 | 7858 | if (e->type()->integer_type() != NULL) |
ccea2b36 | 7859 | { |
7860 | int ebits = e->type()->integer_type()->bits(); | |
7861 | int intbits = Type::lookup_integer_type("int")->integer_type()->bits(); | |
7862 | ||
7863 | // We can treat ebits == intbits as small even for an unsigned | |
7864 | // integer type, because we will convert the value to int and | |
7865 | // then reject it in the runtime if it is negative. | |
7866 | *small = ebits <= intbits; | |
7867 | ||
7868 | return true; | |
7869 | } | |
1ad00fd4 | 7870 | |
631d5788 | 7871 | go_error_at(e->location(), "non-integer %s argument to make", |
7872 | is_length ? "len" : "cap"); | |
a9182619 | 7873 | return false; |
7874 | } | |
7875 | ||
e440a328 | 7876 | // Return the type of the real or imag functions, given the type of |
fcbea5e4 | 7877 | // the argument. We need to map complex64 to float32 and complex128 |
7878 | // to float64, so it has to be done by name. This returns NULL if it | |
7879 | // can't figure out the type. | |
e440a328 | 7880 | |
7881 | Type* | |
7882 | Builtin_call_expression::real_imag_type(Type* arg_type) | |
7883 | { | |
7884 | if (arg_type == NULL || arg_type->is_abstract()) | |
7885 | return NULL; | |
7886 | Named_type* nt = arg_type->named_type(); | |
7887 | if (nt == NULL) | |
7888 | return NULL; | |
7889 | while (nt->real_type()->named_type() != NULL) | |
7890 | nt = nt->real_type()->named_type(); | |
48080209 | 7891 | if (nt->name() == "complex64") |
e440a328 | 7892 | return Type::lookup_float_type("float32"); |
7893 | else if (nt->name() == "complex128") | |
7894 | return Type::lookup_float_type("float64"); | |
7895 | else | |
7896 | return NULL; | |
7897 | } | |
7898 | ||
48080209 | 7899 | // Return the type of the complex function, given the type of one of the |
e440a328 | 7900 | // argments. Like real_imag_type, we have to map by name. |
7901 | ||
7902 | Type* | |
48080209 | 7903 | Builtin_call_expression::complex_type(Type* arg_type) |
e440a328 | 7904 | { |
7905 | if (arg_type == NULL || arg_type->is_abstract()) | |
7906 | return NULL; | |
7907 | Named_type* nt = arg_type->named_type(); | |
7908 | if (nt == NULL) | |
7909 | return NULL; | |
7910 | while (nt->real_type()->named_type() != NULL) | |
7911 | nt = nt->real_type()->named_type(); | |
48080209 | 7912 | if (nt->name() == "float32") |
e440a328 | 7913 | return Type::lookup_complex_type("complex64"); |
7914 | else if (nt->name() == "float64") | |
7915 | return Type::lookup_complex_type("complex128"); | |
7916 | else | |
7917 | return NULL; | |
7918 | } | |
7919 | ||
7920 | // Return a single argument, or NULL if there isn't one. | |
7921 | ||
7922 | Expression* | |
7923 | Builtin_call_expression::one_arg() const | |
7924 | { | |
7925 | const Expression_list* args = this->args(); | |
aa615cb3 | 7926 | if (args == NULL || args->size() != 1) |
e440a328 | 7927 | return NULL; |
7928 | return args->front(); | |
7929 | } | |
7930 | ||
83921647 | 7931 | // A traversal class which looks for a call or receive expression. |
7932 | ||
7933 | class Find_call_expression : public Traverse | |
7934 | { | |
7935 | public: | |
7936 | Find_call_expression() | |
7937 | : Traverse(traverse_expressions), | |
7938 | found_(false) | |
7939 | { } | |
7940 | ||
7941 | int | |
7942 | expression(Expression**); | |
7943 | ||
7944 | bool | |
7945 | found() | |
7946 | { return this->found_; } | |
7947 | ||
7948 | private: | |
7949 | bool found_; | |
7950 | }; | |
7951 | ||
7952 | int | |
7953 | Find_call_expression::expression(Expression** pexpr) | |
7954 | { | |
7955 | if ((*pexpr)->call_expression() != NULL | |
7956 | || (*pexpr)->receive_expression() != NULL) | |
7957 | { | |
7958 | this->found_ = true; | |
7959 | return TRAVERSE_EXIT; | |
7960 | } | |
7961 | return TRAVERSE_CONTINUE; | |
7962 | } | |
7963 | ||
7964 | // Return whether this is constant: len of a string constant, or len | |
7965 | // or cap of an array, or unsafe.Sizeof, unsafe.Offsetof, | |
7966 | // unsafe.Alignof. | |
e440a328 | 7967 | |
7968 | bool | |
7969 | Builtin_call_expression::do_is_constant() const | |
7970 | { | |
12e69faa | 7971 | if (this->is_error_expression()) |
7972 | return true; | |
e440a328 | 7973 | switch (this->code_) |
7974 | { | |
7975 | case BUILTIN_LEN: | |
7976 | case BUILTIN_CAP: | |
7977 | { | |
0f914071 | 7978 | if (this->seen_) |
7979 | return false; | |
7980 | ||
e440a328 | 7981 | Expression* arg = this->one_arg(); |
7982 | if (arg == NULL) | |
7983 | return false; | |
7984 | Type* arg_type = arg->type(); | |
7985 | ||
7986 | if (arg_type->points_to() != NULL | |
7987 | && arg_type->points_to()->array_type() != NULL | |
411eb89e | 7988 | && !arg_type->points_to()->is_slice_type()) |
e440a328 | 7989 | arg_type = arg_type->points_to(); |
7990 | ||
83921647 | 7991 | // The len and cap functions are only constant if there are no |
7992 | // function calls or channel operations in the arguments. | |
7993 | // Otherwise we have to make the call. | |
7994 | if (!arg->is_constant()) | |
7995 | { | |
7996 | Find_call_expression find_call; | |
7997 | Expression::traverse(&arg, &find_call); | |
7998 | if (find_call.found()) | |
7999 | return false; | |
8000 | } | |
8001 | ||
e440a328 | 8002 | if (arg_type->array_type() != NULL |
8003 | && arg_type->array_type()->length() != NULL) | |
0f914071 | 8004 | return true; |
e440a328 | 8005 | |
8006 | if (this->code_ == BUILTIN_LEN && arg_type->is_string_type()) | |
0f914071 | 8007 | { |
8008 | this->seen_ = true; | |
8009 | bool ret = arg->is_constant(); | |
8010 | this->seen_ = false; | |
8011 | return ret; | |
8012 | } | |
e440a328 | 8013 | } |
8014 | break; | |
8015 | ||
8016 | case BUILTIN_SIZEOF: | |
8017 | case BUILTIN_ALIGNOF: | |
8018 | return this->one_arg() != NULL; | |
8019 | ||
8020 | case BUILTIN_OFFSETOF: | |
8021 | { | |
8022 | Expression* arg = this->one_arg(); | |
8023 | if (arg == NULL) | |
8024 | return false; | |
8025 | return arg->field_reference_expression() != NULL; | |
8026 | } | |
8027 | ||
48080209 | 8028 | case BUILTIN_COMPLEX: |
e440a328 | 8029 | { |
8030 | const Expression_list* args = this->args(); | |
8031 | if (args != NULL && args->size() == 2) | |
8032 | return args->front()->is_constant() && args->back()->is_constant(); | |
8033 | } | |
8034 | break; | |
8035 | ||
8036 | case BUILTIN_REAL: | |
8037 | case BUILTIN_IMAG: | |
8038 | { | |
8039 | Expression* arg = this->one_arg(); | |
8040 | return arg != NULL && arg->is_constant(); | |
8041 | } | |
8042 | ||
8043 | default: | |
8044 | break; | |
8045 | } | |
8046 | ||
8047 | return false; | |
8048 | } | |
8049 | ||
0c77715b | 8050 | // Return a numeric constant if possible. |
e440a328 | 8051 | |
8052 | bool | |
0c77715b | 8053 | Builtin_call_expression::do_numeric_constant_value(Numeric_constant* nc) const |
e440a328 | 8054 | { |
8055 | if (this->code_ == BUILTIN_LEN | |
8056 | || this->code_ == BUILTIN_CAP) | |
8057 | { | |
8058 | Expression* arg = this->one_arg(); | |
8059 | if (arg == NULL) | |
8060 | return false; | |
8061 | Type* arg_type = arg->type(); | |
8062 | ||
8063 | if (this->code_ == BUILTIN_LEN && arg_type->is_string_type()) | |
8064 | { | |
8065 | std::string sval; | |
8066 | if (arg->string_constant_value(&sval)) | |
8067 | { | |
0c77715b | 8068 | nc->set_unsigned_long(Type::lookup_integer_type("int"), |
8069 | sval.length()); | |
e440a328 | 8070 | return true; |
8071 | } | |
8072 | } | |
8073 | ||
8074 | if (arg_type->points_to() != NULL | |
8075 | && arg_type->points_to()->array_type() != NULL | |
411eb89e | 8076 | && !arg_type->points_to()->is_slice_type()) |
e440a328 | 8077 | arg_type = arg_type->points_to(); |
8078 | ||
8079 | if (arg_type->array_type() != NULL | |
8080 | && arg_type->array_type()->length() != NULL) | |
8081 | { | |
0f914071 | 8082 | if (this->seen_) |
8083 | return false; | |
e440a328 | 8084 | Expression* e = arg_type->array_type()->length(); |
0f914071 | 8085 | this->seen_ = true; |
0c77715b | 8086 | bool r = e->numeric_constant_value(nc); |
0f914071 | 8087 | this->seen_ = false; |
8088 | if (r) | |
e440a328 | 8089 | { |
0c77715b | 8090 | if (!nc->set_type(Type::lookup_integer_type("int"), false, |
8091 | this->location())) | |
8092 | r = false; | |
e440a328 | 8093 | } |
0c77715b | 8094 | return r; |
e440a328 | 8095 | } |
8096 | } | |
8097 | else if (this->code_ == BUILTIN_SIZEOF | |
8098 | || this->code_ == BUILTIN_ALIGNOF) | |
8099 | { | |
8100 | Expression* arg = this->one_arg(); | |
8101 | if (arg == NULL) | |
8102 | return false; | |
8103 | Type* arg_type = arg->type(); | |
5c13bd80 | 8104 | if (arg_type->is_error()) |
e440a328 | 8105 | return false; |
8106 | if (arg_type->is_abstract()) | |
8107 | return false; | |
2c809f8f | 8108 | if (this->seen_) |
8109 | return false; | |
927a01eb | 8110 | |
3f378015 | 8111 | int64_t ret; |
e440a328 | 8112 | if (this->code_ == BUILTIN_SIZEOF) |
8113 | { | |
2c809f8f | 8114 | this->seen_ = true; |
8115 | bool ok = arg_type->backend_type_size(this->gogo_, &ret); | |
8116 | this->seen_ = false; | |
8117 | if (!ok) | |
e440a328 | 8118 | return false; |
8119 | } | |
8120 | else if (this->code_ == BUILTIN_ALIGNOF) | |
8121 | { | |
2c809f8f | 8122 | bool ok; |
8123 | this->seen_ = true; | |
637bd3af | 8124 | if (arg->field_reference_expression() == NULL) |
2c809f8f | 8125 | ok = arg_type->backend_type_align(this->gogo_, &ret); |
637bd3af | 8126 | else |
e440a328 | 8127 | { |
8128 | // Calling unsafe.Alignof(s.f) returns the alignment of | |
8129 | // the type of f when it is used as a field in a struct. | |
2c809f8f | 8130 | ok = arg_type->backend_type_field_align(this->gogo_, &ret); |
e440a328 | 8131 | } |
2c809f8f | 8132 | this->seen_ = false; |
8133 | if (!ok) | |
8134 | return false; | |
e440a328 | 8135 | } |
8136 | else | |
c3e6f413 | 8137 | go_unreachable(); |
927a01eb | 8138 | |
3f378015 | 8139 | mpz_t zval; |
8140 | set_mpz_from_int64(&zval, ret); | |
8141 | nc->set_int(Type::lookup_integer_type("uintptr"), zval); | |
8142 | mpz_clear(zval); | |
e440a328 | 8143 | return true; |
8144 | } | |
8145 | else if (this->code_ == BUILTIN_OFFSETOF) | |
8146 | { | |
8147 | Expression* arg = this->one_arg(); | |
8148 | if (arg == NULL) | |
8149 | return false; | |
8150 | Field_reference_expression* farg = arg->field_reference_expression(); | |
8151 | if (farg == NULL) | |
8152 | return false; | |
2c809f8f | 8153 | if (this->seen_) |
8154 | return false; | |
8155 | ||
3f378015 | 8156 | int64_t total_offset = 0; |
9a4bd570 | 8157 | while (true) |
8158 | { | |
8159 | Expression* struct_expr = farg->expr(); | |
8160 | Type* st = struct_expr->type(); | |
8161 | if (st->struct_type() == NULL) | |
8162 | return false; | |
8163 | if (st->named_type() != NULL) | |
8164 | st->named_type()->convert(this->gogo_); | |
3f378015 | 8165 | int64_t offset; |
2c809f8f | 8166 | this->seen_ = true; |
8167 | bool ok = st->struct_type()->backend_field_offset(this->gogo_, | |
8168 | farg->field_index(), | |
8169 | &offset); | |
8170 | this->seen_ = false; | |
8171 | if (!ok) | |
8172 | return false; | |
9a4bd570 | 8173 | total_offset += offset; |
8174 | if (farg->implicit() && struct_expr->field_reference_expression() != NULL) | |
8175 | { | |
8176 | // Go up until we reach the original base. | |
8177 | farg = struct_expr->field_reference_expression(); | |
8178 | continue; | |
8179 | } | |
8180 | break; | |
8181 | } | |
3f378015 | 8182 | mpz_t zval; |
8183 | set_mpz_from_int64(&zval, total_offset); | |
8184 | nc->set_int(Type::lookup_integer_type("uintptr"), zval); | |
8185 | mpz_clear(zval); | |
e440a328 | 8186 | return true; |
8187 | } | |
0c77715b | 8188 | else if (this->code_ == BUILTIN_REAL || this->code_ == BUILTIN_IMAG) |
e440a328 | 8189 | { |
8190 | Expression* arg = this->one_arg(); | |
8191 | if (arg == NULL) | |
8192 | return false; | |
8193 | ||
0c77715b | 8194 | Numeric_constant argnc; |
8195 | if (!arg->numeric_constant_value(&argnc)) | |
8196 | return false; | |
8197 | ||
fcbea5e4 | 8198 | mpc_t val; |
8199 | if (!argnc.to_complex(&val)) | |
0c77715b | 8200 | return false; |
e440a328 | 8201 | |
0c77715b | 8202 | Type* type = Builtin_call_expression::real_imag_type(argnc.type()); |
8203 | if (this->code_ == BUILTIN_REAL) | |
fcbea5e4 | 8204 | nc->set_float(type, mpc_realref(val)); |
0c77715b | 8205 | else |
fcbea5e4 | 8206 | nc->set_float(type, mpc_imagref(val)); |
8207 | mpc_clear(val); | |
0c77715b | 8208 | return true; |
e440a328 | 8209 | } |
0c77715b | 8210 | else if (this->code_ == BUILTIN_COMPLEX) |
e440a328 | 8211 | { |
8212 | const Expression_list* args = this->args(); | |
8213 | if (args == NULL || args->size() != 2) | |
8214 | return false; | |
8215 | ||
0c77715b | 8216 | Numeric_constant rnc; |
8217 | if (!args->front()->numeric_constant_value(&rnc)) | |
8218 | return false; | |
8219 | Numeric_constant inc; | |
8220 | if (!args->back()->numeric_constant_value(&inc)) | |
8221 | return false; | |
8222 | ||
8223 | if (rnc.type() != NULL | |
8224 | && !rnc.type()->is_abstract() | |
8225 | && inc.type() != NULL | |
8226 | && !inc.type()->is_abstract() | |
8227 | && !Type::are_identical(rnc.type(), inc.type(), false, NULL)) | |
8228 | return false; | |
8229 | ||
e440a328 | 8230 | mpfr_t r; |
0c77715b | 8231 | if (!rnc.to_float(&r)) |
8232 | return false; | |
8233 | mpfr_t i; | |
8234 | if (!inc.to_float(&i)) | |
e440a328 | 8235 | { |
8236 | mpfr_clear(r); | |
8237 | return false; | |
8238 | } | |
8239 | ||
0c77715b | 8240 | Type* arg_type = rnc.type(); |
8241 | if (arg_type == NULL || arg_type->is_abstract()) | |
8242 | arg_type = inc.type(); | |
e440a328 | 8243 | |
fcbea5e4 | 8244 | mpc_t val; |
8245 | mpc_init2(val, mpc_precision); | |
8246 | mpc_set_fr_fr(val, r, i, MPC_RNDNN); | |
e440a328 | 8247 | mpfr_clear(r); |
8248 | mpfr_clear(i); | |
8249 | ||
fcbea5e4 | 8250 | Type* type = Builtin_call_expression::complex_type(arg_type); |
8251 | nc->set_complex(type, val); | |
8252 | ||
8253 | mpc_clear(val); | |
8254 | ||
0c77715b | 8255 | return true; |
e440a328 | 8256 | } |
8257 | ||
8258 | return false; | |
8259 | } | |
8260 | ||
a7549a6a | 8261 | // Give an error if we are discarding the value of an expression which |
8262 | // should not normally be discarded. We don't give an error for | |
8263 | // discarding the value of an ordinary function call, but we do for | |
8264 | // builtin functions, purely for consistency with the gc compiler. | |
8265 | ||
4f2138d7 | 8266 | bool |
a7549a6a | 8267 | Builtin_call_expression::do_discarding_value() |
8268 | { | |
8269 | switch (this->code_) | |
8270 | { | |
8271 | case BUILTIN_INVALID: | |
8272 | default: | |
8273 | go_unreachable(); | |
8274 | ||
8275 | case BUILTIN_APPEND: | |
8276 | case BUILTIN_CAP: | |
8277 | case BUILTIN_COMPLEX: | |
8278 | case BUILTIN_IMAG: | |
8279 | case BUILTIN_LEN: | |
8280 | case BUILTIN_MAKE: | |
8281 | case BUILTIN_NEW: | |
8282 | case BUILTIN_REAL: | |
8283 | case BUILTIN_ALIGNOF: | |
8284 | case BUILTIN_OFFSETOF: | |
8285 | case BUILTIN_SIZEOF: | |
8286 | this->unused_value_error(); | |
4f2138d7 | 8287 | return false; |
a7549a6a | 8288 | |
8289 | case BUILTIN_CLOSE: | |
8290 | case BUILTIN_COPY: | |
1cce762f | 8291 | case BUILTIN_DELETE: |
a7549a6a | 8292 | case BUILTIN_PANIC: |
8293 | case BUILTIN_PRINT: | |
8294 | case BUILTIN_PRINTLN: | |
8295 | case BUILTIN_RECOVER: | |
4f2138d7 | 8296 | return true; |
a7549a6a | 8297 | } |
8298 | } | |
8299 | ||
e440a328 | 8300 | // Return the type. |
8301 | ||
8302 | Type* | |
8303 | Builtin_call_expression::do_type() | |
8304 | { | |
79651b1f | 8305 | if (this->is_error_expression()) |
8306 | return Type::make_error_type(); | |
e440a328 | 8307 | switch (this->code_) |
8308 | { | |
8309 | case BUILTIN_INVALID: | |
8310 | default: | |
79651b1f | 8311 | return Type::make_error_type(); |
e440a328 | 8312 | |
8313 | case BUILTIN_NEW: | |
8314 | case BUILTIN_MAKE: | |
8315 | { | |
8316 | const Expression_list* args = this->args(); | |
8317 | if (args == NULL || args->empty()) | |
8318 | return Type::make_error_type(); | |
8319 | return Type::make_pointer_type(args->front()->type()); | |
8320 | } | |
8321 | ||
8322 | case BUILTIN_CAP: | |
8323 | case BUILTIN_COPY: | |
8324 | case BUILTIN_LEN: | |
7ba86326 | 8325 | return Type::lookup_integer_type("int"); |
8326 | ||
e440a328 | 8327 | case BUILTIN_ALIGNOF: |
8328 | case BUILTIN_OFFSETOF: | |
8329 | case BUILTIN_SIZEOF: | |
7ba86326 | 8330 | return Type::lookup_integer_type("uintptr"); |
e440a328 | 8331 | |
8332 | case BUILTIN_CLOSE: | |
1cce762f | 8333 | case BUILTIN_DELETE: |
e440a328 | 8334 | case BUILTIN_PANIC: |
8335 | case BUILTIN_PRINT: | |
8336 | case BUILTIN_PRINTLN: | |
8337 | return Type::make_void_type(); | |
8338 | ||
e440a328 | 8339 | case BUILTIN_RECOVER: |
823c7e3d | 8340 | return Type::make_empty_interface_type(Linemap::predeclared_location()); |
e440a328 | 8341 | |
8342 | case BUILTIN_APPEND: | |
8343 | { | |
8344 | const Expression_list* args = this->args(); | |
8345 | if (args == NULL || args->empty()) | |
8346 | return Type::make_error_type(); | |
3ff4863b | 8347 | Type *ret = args->front()->type(); |
8348 | if (!ret->is_slice_type()) | |
8349 | return Type::make_error_type(); | |
8350 | return ret; | |
e440a328 | 8351 | } |
8352 | ||
8353 | case BUILTIN_REAL: | |
8354 | case BUILTIN_IMAG: | |
8355 | { | |
8356 | Expression* arg = this->one_arg(); | |
8357 | if (arg == NULL) | |
8358 | return Type::make_error_type(); | |
8359 | Type* t = arg->type(); | |
8360 | if (t->is_abstract()) | |
8361 | t = t->make_non_abstract_type(); | |
8362 | t = Builtin_call_expression::real_imag_type(t); | |
8363 | if (t == NULL) | |
8364 | t = Type::make_error_type(); | |
8365 | return t; | |
8366 | } | |
8367 | ||
48080209 | 8368 | case BUILTIN_COMPLEX: |
e440a328 | 8369 | { |
8370 | const Expression_list* args = this->args(); | |
8371 | if (args == NULL || args->size() != 2) | |
8372 | return Type::make_error_type(); | |
8373 | Type* t = args->front()->type(); | |
8374 | if (t->is_abstract()) | |
8375 | { | |
8376 | t = args->back()->type(); | |
8377 | if (t->is_abstract()) | |
8378 | t = t->make_non_abstract_type(); | |
8379 | } | |
48080209 | 8380 | t = Builtin_call_expression::complex_type(t); |
e440a328 | 8381 | if (t == NULL) |
8382 | t = Type::make_error_type(); | |
8383 | return t; | |
8384 | } | |
8385 | } | |
8386 | } | |
8387 | ||
8388 | // Determine the type. | |
8389 | ||
8390 | void | |
8391 | Builtin_call_expression::do_determine_type(const Type_context* context) | |
8392 | { | |
fb94b0ca | 8393 | if (!this->determining_types()) |
8394 | return; | |
8395 | ||
e440a328 | 8396 | this->fn()->determine_type_no_context(); |
8397 | ||
8398 | const Expression_list* args = this->args(); | |
8399 | ||
8400 | bool is_print; | |
8401 | Type* arg_type = NULL; | |
321e5ad2 | 8402 | Type* trailing_arg_types = NULL; |
e440a328 | 8403 | switch (this->code_) |
8404 | { | |
8405 | case BUILTIN_PRINT: | |
8406 | case BUILTIN_PRINTLN: | |
8407 | // Do not force a large integer constant to "int". | |
8408 | is_print = true; | |
8409 | break; | |
8410 | ||
8411 | case BUILTIN_REAL: | |
8412 | case BUILTIN_IMAG: | |
48080209 | 8413 | arg_type = Builtin_call_expression::complex_type(context->type); |
f6bc81e6 | 8414 | if (arg_type == NULL) |
8415 | arg_type = Type::lookup_complex_type("complex128"); | |
e440a328 | 8416 | is_print = false; |
8417 | break; | |
8418 | ||
48080209 | 8419 | case BUILTIN_COMPLEX: |
e440a328 | 8420 | { |
48080209 | 8421 | // For the complex function the type of one operand can |
e440a328 | 8422 | // determine the type of the other, as in a binary expression. |
8423 | arg_type = Builtin_call_expression::real_imag_type(context->type); | |
f6bc81e6 | 8424 | if (arg_type == NULL) |
8425 | arg_type = Type::lookup_float_type("float64"); | |
e440a328 | 8426 | if (args != NULL && args->size() == 2) |
8427 | { | |
8428 | Type* t1 = args->front()->type(); | |
c849bb59 | 8429 | Type* t2 = args->back()->type(); |
e440a328 | 8430 | if (!t1->is_abstract()) |
8431 | arg_type = t1; | |
8432 | else if (!t2->is_abstract()) | |
8433 | arg_type = t2; | |
8434 | } | |
8435 | is_print = false; | |
8436 | } | |
8437 | break; | |
8438 | ||
321e5ad2 | 8439 | case BUILTIN_APPEND: |
8440 | if (!this->is_varargs() | |
8441 | && args != NULL | |
8442 | && !args->empty() | |
8443 | && args->front()->type()->is_slice_type()) | |
8444 | trailing_arg_types = | |
8445 | args->front()->type()->array_type()->element_type(); | |
8446 | is_print = false; | |
8447 | break; | |
8448 | ||
e440a328 | 8449 | default: |
8450 | is_print = false; | |
8451 | break; | |
8452 | } | |
8453 | ||
8454 | if (args != NULL) | |
8455 | { | |
8456 | for (Expression_list::const_iterator pa = args->begin(); | |
8457 | pa != args->end(); | |
8458 | ++pa) | |
8459 | { | |
8460 | Type_context subcontext; | |
8461 | subcontext.type = arg_type; | |
8462 | ||
8463 | if (is_print) | |
8464 | { | |
8465 | // We want to print large constants, we so can't just | |
8466 | // use the appropriate nonabstract type. Use uint64 for | |
8467 | // an integer if we know it is nonnegative, otherwise | |
8468 | // use int64 for a integer, otherwise use float64 for a | |
8469 | // float or complex128 for a complex. | |
8470 | Type* want_type = NULL; | |
8471 | Type* atype = (*pa)->type(); | |
8472 | if (atype->is_abstract()) | |
8473 | { | |
8474 | if (atype->integer_type() != NULL) | |
8475 | { | |
0c77715b | 8476 | Numeric_constant nc; |
8477 | if (this->numeric_constant_value(&nc)) | |
8478 | { | |
8479 | mpz_t val; | |
8480 | if (nc.to_int(&val)) | |
8481 | { | |
8482 | if (mpz_sgn(val) >= 0) | |
8483 | want_type = Type::lookup_integer_type("uint64"); | |
8484 | mpz_clear(val); | |
8485 | } | |
8486 | } | |
8487 | if (want_type == NULL) | |
e440a328 | 8488 | want_type = Type::lookup_integer_type("int64"); |
e440a328 | 8489 | } |
8490 | else if (atype->float_type() != NULL) | |
8491 | want_type = Type::lookup_float_type("float64"); | |
8492 | else if (atype->complex_type() != NULL) | |
8493 | want_type = Type::lookup_complex_type("complex128"); | |
8494 | else if (atype->is_abstract_string_type()) | |
8495 | want_type = Type::lookup_string_type(); | |
8496 | else if (atype->is_abstract_boolean_type()) | |
8497 | want_type = Type::lookup_bool_type(); | |
8498 | else | |
c3e6f413 | 8499 | go_unreachable(); |
e440a328 | 8500 | subcontext.type = want_type; |
8501 | } | |
8502 | } | |
8503 | ||
8504 | (*pa)->determine_type(&subcontext); | |
321e5ad2 | 8505 | |
8506 | if (trailing_arg_types != NULL) | |
8507 | { | |
8508 | arg_type = trailing_arg_types; | |
8509 | trailing_arg_types = NULL; | |
8510 | } | |
e440a328 | 8511 | } |
8512 | } | |
8513 | } | |
8514 | ||
8515 | // If there is exactly one argument, return true. Otherwise give an | |
8516 | // error message and return false. | |
8517 | ||
8518 | bool | |
8519 | Builtin_call_expression::check_one_arg() | |
8520 | { | |
8521 | const Expression_list* args = this->args(); | |
8522 | if (args == NULL || args->size() < 1) | |
8523 | { | |
8524 | this->report_error(_("not enough arguments")); | |
8525 | return false; | |
8526 | } | |
8527 | else if (args->size() > 1) | |
8528 | { | |
8529 | this->report_error(_("too many arguments")); | |
8530 | return false; | |
8531 | } | |
8532 | if (args->front()->is_error_expression() | |
5c13bd80 | 8533 | || args->front()->type()->is_error()) |
e440a328 | 8534 | { |
8535 | this->set_is_error(); | |
8536 | return false; | |
8537 | } | |
8538 | return true; | |
8539 | } | |
8540 | ||
8541 | // Check argument types for a builtin function. | |
8542 | ||
8543 | void | |
8544 | Builtin_call_expression::do_check_types(Gogo*) | |
8545 | { | |
375646ea | 8546 | if (this->is_error_expression()) |
8547 | return; | |
e440a328 | 8548 | switch (this->code_) |
8549 | { | |
8550 | case BUILTIN_INVALID: | |
8551 | case BUILTIN_NEW: | |
8552 | case BUILTIN_MAKE: | |
cd238b8d | 8553 | case BUILTIN_DELETE: |
e440a328 | 8554 | return; |
8555 | ||
8556 | case BUILTIN_LEN: | |
8557 | case BUILTIN_CAP: | |
8558 | { | |
8559 | // The single argument may be either a string or an array or a | |
8560 | // map or a channel, or a pointer to a closed array. | |
8561 | if (this->check_one_arg()) | |
8562 | { | |
8563 | Type* arg_type = this->one_arg()->type(); | |
8564 | if (arg_type->points_to() != NULL | |
8565 | && arg_type->points_to()->array_type() != NULL | |
411eb89e | 8566 | && !arg_type->points_to()->is_slice_type()) |
e440a328 | 8567 | arg_type = arg_type->points_to(); |
8568 | if (this->code_ == BUILTIN_CAP) | |
8569 | { | |
5c13bd80 | 8570 | if (!arg_type->is_error() |
e440a328 | 8571 | && arg_type->array_type() == NULL |
8572 | && arg_type->channel_type() == NULL) | |
8573 | this->report_error(_("argument must be array or slice " | |
8574 | "or channel")); | |
8575 | } | |
8576 | else | |
8577 | { | |
5c13bd80 | 8578 | if (!arg_type->is_error() |
e440a328 | 8579 | && !arg_type->is_string_type() |
8580 | && arg_type->array_type() == NULL | |
8581 | && arg_type->map_type() == NULL | |
8582 | && arg_type->channel_type() == NULL) | |
8583 | this->report_error(_("argument must be string or " | |
8584 | "array or slice or map or channel")); | |
8585 | } | |
8586 | } | |
8587 | } | |
8588 | break; | |
8589 | ||
8590 | case BUILTIN_PRINT: | |
8591 | case BUILTIN_PRINTLN: | |
8592 | { | |
8593 | const Expression_list* args = this->args(); | |
8594 | if (args == NULL) | |
8595 | { | |
8596 | if (this->code_ == BUILTIN_PRINT) | |
631d5788 | 8597 | go_warning_at(this->location(), 0, |
e440a328 | 8598 | "no arguments for builtin function %<%s%>", |
8599 | (this->code_ == BUILTIN_PRINT | |
8600 | ? "print" | |
8601 | : "println")); | |
8602 | } | |
8603 | else | |
8604 | { | |
8605 | for (Expression_list::const_iterator p = args->begin(); | |
8606 | p != args->end(); | |
8607 | ++p) | |
8608 | { | |
8609 | Type* type = (*p)->type(); | |
5c13bd80 | 8610 | if (type->is_error() |
e440a328 | 8611 | || type->is_string_type() |
8612 | || type->integer_type() != NULL | |
8613 | || type->float_type() != NULL | |
8614 | || type->complex_type() != NULL | |
8615 | || type->is_boolean_type() | |
8616 | || type->points_to() != NULL | |
8617 | || type->interface_type() != NULL | |
8618 | || type->channel_type() != NULL | |
8619 | || type->map_type() != NULL | |
8620 | || type->function_type() != NULL | |
411eb89e | 8621 | || type->is_slice_type()) |
e440a328 | 8622 | ; |
acf8e158 | 8623 | else if ((*p)->is_type_expression()) |
8624 | { | |
8625 | // If this is a type expression it's going to give | |
8626 | // an error anyhow, so we don't need one here. | |
8627 | } | |
e440a328 | 8628 | else |
8629 | this->report_error(_("unsupported argument type to " | |
8630 | "builtin function")); | |
8631 | } | |
8632 | } | |
8633 | } | |
8634 | break; | |
8635 | ||
8636 | case BUILTIN_CLOSE: | |
e440a328 | 8637 | if (this->check_one_arg()) |
8638 | { | |
8639 | if (this->one_arg()->type()->channel_type() == NULL) | |
8640 | this->report_error(_("argument must be channel")); | |
5202d986 | 8641 | else if (!this->one_arg()->type()->channel_type()->may_send()) |
8642 | this->report_error(_("cannot close receive-only channel")); | |
e440a328 | 8643 | } |
8644 | break; | |
8645 | ||
8646 | case BUILTIN_PANIC: | |
8647 | case BUILTIN_SIZEOF: | |
8648 | case BUILTIN_ALIGNOF: | |
8649 | this->check_one_arg(); | |
8650 | break; | |
8651 | ||
8652 | case BUILTIN_RECOVER: | |
6334270b | 8653 | if (this->args() != NULL |
8654 | && !this->args()->empty() | |
8655 | && !this->recover_arg_is_set_) | |
e440a328 | 8656 | this->report_error(_("too many arguments")); |
8657 | break; | |
8658 | ||
8659 | case BUILTIN_OFFSETOF: | |
8660 | if (this->check_one_arg()) | |
8661 | { | |
8662 | Expression* arg = this->one_arg(); | |
8663 | if (arg->field_reference_expression() == NULL) | |
8664 | this->report_error(_("argument must be a field reference")); | |
8665 | } | |
8666 | break; | |
8667 | ||
8668 | case BUILTIN_COPY: | |
8669 | { | |
8670 | const Expression_list* args = this->args(); | |
8671 | if (args == NULL || args->size() < 2) | |
8672 | { | |
8673 | this->report_error(_("not enough arguments")); | |
8674 | break; | |
8675 | } | |
8676 | else if (args->size() > 2) | |
8677 | { | |
8678 | this->report_error(_("too many arguments")); | |
8679 | break; | |
8680 | } | |
8681 | Type* arg1_type = args->front()->type(); | |
8682 | Type* arg2_type = args->back()->type(); | |
5c13bd80 | 8683 | if (arg1_type->is_error() || arg2_type->is_error()) |
6bebb39d | 8684 | { |
8685 | this->set_is_error(); | |
8686 | break; | |
8687 | } | |
e440a328 | 8688 | |
8689 | Type* e1; | |
411eb89e | 8690 | if (arg1_type->is_slice_type()) |
e440a328 | 8691 | e1 = arg1_type->array_type()->element_type(); |
8692 | else | |
8693 | { | |
8694 | this->report_error(_("left argument must be a slice")); | |
8695 | break; | |
8696 | } | |
8697 | ||
411eb89e | 8698 | if (arg2_type->is_slice_type()) |
60963afd | 8699 | { |
8700 | Type* e2 = arg2_type->array_type()->element_type(); | |
8701 | if (!Type::are_identical(e1, e2, true, NULL)) | |
8702 | this->report_error(_("element types must be the same")); | |
8703 | } | |
e440a328 | 8704 | else if (arg2_type->is_string_type()) |
e440a328 | 8705 | { |
60963afd | 8706 | if (e1->integer_type() == NULL || !e1->integer_type()->is_byte()) |
8707 | this->report_error(_("first argument must be []byte")); | |
e440a328 | 8708 | } |
60963afd | 8709 | else |
8710 | this->report_error(_("second argument must be slice or string")); | |
e440a328 | 8711 | } |
8712 | break; | |
8713 | ||
8714 | case BUILTIN_APPEND: | |
8715 | { | |
8716 | const Expression_list* args = this->args(); | |
321e5ad2 | 8717 | if (args == NULL || args->empty()) |
e440a328 | 8718 | { |
8719 | this->report_error(_("not enough arguments")); | |
8720 | break; | |
8721 | } | |
321e5ad2 | 8722 | |
8723 | Type* slice_type = args->front()->type(); | |
8724 | if (!slice_type->is_slice_type()) | |
6bebb39d | 8725 | { |
321e5ad2 | 8726 | if (slice_type->is_error_type()) |
8727 | break; | |
8728 | if (slice_type->is_nil_type()) | |
8729 | go_error_at(args->front()->location(), "use of untyped nil"); | |
8730 | else | |
8731 | go_error_at(args->front()->location(), | |
8732 | "argument 1 must be a slice"); | |
6bebb39d | 8733 | this->set_is_error(); |
8734 | break; | |
8735 | } | |
cd238b8d | 8736 | |
321e5ad2 | 8737 | Type* element_type = slice_type->array_type()->element_type(); |
8738 | if (this->is_varargs()) | |
4fd4fcf4 | 8739 | { |
321e5ad2 | 8740 | if (!args->back()->type()->is_slice_type() |
8741 | && !args->back()->type()->is_string_type()) | |
8742 | { | |
8743 | go_error_at(args->back()->location(), | |
8744 | "invalid use of %<...%> with non-slice/non-string"); | |
8745 | this->set_is_error(); | |
8746 | break; | |
8747 | } | |
4fd4fcf4 | 8748 | |
321e5ad2 | 8749 | if (args->size() < 2) |
8750 | { | |
8751 | this->report_error(_("not enough arguments")); | |
8752 | break; | |
8753 | } | |
8754 | if (args->size() > 2) | |
8755 | { | |
8756 | this->report_error(_("too many arguments")); | |
8757 | break; | |
8758 | } | |
8759 | ||
8760 | if (args->back()->type()->is_string_type() | |
8761 | && element_type->integer_type() != NULL | |
8762 | && element_type->integer_type()->is_byte()) | |
8763 | { | |
8764 | // Permit append(s1, s2...) when s1 is a slice of | |
8765 | // bytes and s2 is a string type. | |
8766 | } | |
e440a328 | 8767 | else |
8768 | { | |
321e5ad2 | 8769 | // We have to test for assignment compatibility to a |
8770 | // slice of the element type, which is not necessarily | |
8771 | // the same as the type of the first argument: the | |
8772 | // first argument might have a named type. | |
8773 | Type* check_type = Type::make_array_type(element_type, NULL); | |
8774 | std::string reason; | |
8775 | if (!Type::are_assignable(check_type, args->back()->type(), | |
8776 | &reason)) | |
8777 | { | |
8778 | if (reason.empty()) | |
8779 | go_error_at(args->back()->location(), | |
8780 | "argument 2 has invalid type"); | |
8781 | else | |
8782 | go_error_at(args->back()->location(), | |
8783 | "argument 2 has invalid type (%s)", | |
8784 | reason.c_str()); | |
8785 | this->set_is_error(); | |
8786 | break; | |
8787 | } | |
8788 | } | |
8789 | } | |
8790 | else | |
8791 | { | |
8792 | Expression_list::const_iterator pa = args->begin(); | |
8793 | int i = 2; | |
8794 | for (++pa; pa != args->end(); ++pa, ++i) | |
8795 | { | |
8796 | std::string reason; | |
8797 | if (!Type::are_assignable(element_type, (*pa)->type(), | |
8798 | &reason)) | |
8799 | { | |
8800 | if (reason.empty()) | |
8801 | go_error_at((*pa)->location(), | |
8802 | "argument %d has incompatible type", i); | |
8803 | else | |
8804 | go_error_at((*pa)->location(), | |
8805 | "argument %d has incompatible type (%s)", | |
8806 | i, reason.c_str()); | |
8807 | this->set_is_error(); | |
8808 | } | |
e440a328 | 8809 | } |
8810 | } | |
e440a328 | 8811 | } |
321e5ad2 | 8812 | break; |
e440a328 | 8813 | |
8814 | case BUILTIN_REAL: | |
8815 | case BUILTIN_IMAG: | |
8816 | if (this->check_one_arg()) | |
8817 | { | |
8818 | if (this->one_arg()->type()->complex_type() == NULL) | |
8819 | this->report_error(_("argument must have complex type")); | |
8820 | } | |
8821 | break; | |
8822 | ||
48080209 | 8823 | case BUILTIN_COMPLEX: |
e440a328 | 8824 | { |
8825 | const Expression_list* args = this->args(); | |
8826 | if (args == NULL || args->size() < 2) | |
8827 | this->report_error(_("not enough arguments")); | |
8828 | else if (args->size() > 2) | |
8829 | this->report_error(_("too many arguments")); | |
8830 | else if (args->front()->is_error_expression() | |
5c13bd80 | 8831 | || args->front()->type()->is_error() |
e440a328 | 8832 | || args->back()->is_error_expression() |
5c13bd80 | 8833 | || args->back()->type()->is_error()) |
e440a328 | 8834 | this->set_is_error(); |
8835 | else if (!Type::are_identical(args->front()->type(), | |
07ba8be5 | 8836 | args->back()->type(), true, NULL)) |
48080209 | 8837 | this->report_error(_("complex arguments must have identical types")); |
e440a328 | 8838 | else if (args->front()->type()->float_type() == NULL) |
48080209 | 8839 | this->report_error(_("complex arguments must have " |
e440a328 | 8840 | "floating-point type")); |
8841 | } | |
8842 | break; | |
8843 | ||
8844 | default: | |
c3e6f413 | 8845 | go_unreachable(); |
e440a328 | 8846 | } |
8847 | } | |
8848 | ||
72666aed | 8849 | Expression* |
8850 | Builtin_call_expression::do_copy() | |
8851 | { | |
8852 | Call_expression* bce = | |
8853 | new Builtin_call_expression(this->gogo_, this->fn()->copy(), | |
da244e59 | 8854 | (this->args() == NULL |
8855 | ? NULL | |
8856 | : this->args()->copy()), | |
72666aed | 8857 | this->is_varargs(), |
8858 | this->location()); | |
8859 | ||
8860 | if (this->varargs_are_lowered()) | |
8861 | bce->set_varargs_are_lowered(); | |
8862 | return bce; | |
8863 | } | |
8864 | ||
ea664253 | 8865 | // Return the backend representation for a builtin function. |
e440a328 | 8866 | |
ea664253 | 8867 | Bexpression* |
8868 | Builtin_call_expression::do_get_backend(Translate_context* context) | |
e440a328 | 8869 | { |
8870 | Gogo* gogo = context->gogo(); | |
b13c66cd | 8871 | Location location = this->location(); |
a0d8874e | 8872 | |
8873 | if (this->is_erroneous_call()) | |
8874 | { | |
8875 | go_assert(saw_errors()); | |
8876 | return gogo->backend()->error_expression(); | |
8877 | } | |
8878 | ||
e440a328 | 8879 | switch (this->code_) |
8880 | { | |
8881 | case BUILTIN_INVALID: | |
8882 | case BUILTIN_NEW: | |
8883 | case BUILTIN_MAKE: | |
c3e6f413 | 8884 | go_unreachable(); |
e440a328 | 8885 | |
8886 | case BUILTIN_LEN: | |
8887 | case BUILTIN_CAP: | |
8888 | { | |
8889 | const Expression_list* args = this->args(); | |
c484d925 | 8890 | go_assert(args != NULL && args->size() == 1); |
2c809f8f | 8891 | Expression* arg = args->front(); |
e440a328 | 8892 | Type* arg_type = arg->type(); |
0f914071 | 8893 | |
8894 | if (this->seen_) | |
8895 | { | |
c484d925 | 8896 | go_assert(saw_errors()); |
ea664253 | 8897 | return context->backend()->error_expression(); |
0f914071 | 8898 | } |
8899 | this->seen_ = true; | |
0f914071 | 8900 | this->seen_ = false; |
e440a328 | 8901 | if (arg_type->points_to() != NULL) |
8902 | { | |
8903 | arg_type = arg_type->points_to(); | |
c484d925 | 8904 | go_assert(arg_type->array_type() != NULL |
411eb89e | 8905 | && !arg_type->is_slice_type()); |
2c809f8f | 8906 | arg = Expression::make_unary(OPERATOR_MULT, arg, location); |
e440a328 | 8907 | } |
8908 | ||
1b1f2abf | 8909 | Type* int_type = Type::lookup_integer_type("int"); |
2c809f8f | 8910 | Expression* val; |
e440a328 | 8911 | if (this->code_ == BUILTIN_LEN) |
8912 | { | |
8913 | if (arg_type->is_string_type()) | |
2c809f8f | 8914 | val = Expression::make_string_info(arg, STRING_INFO_LENGTH, |
8915 | location); | |
e440a328 | 8916 | else if (arg_type->array_type() != NULL) |
0f914071 | 8917 | { |
8918 | if (this->seen_) | |
8919 | { | |
c484d925 | 8920 | go_assert(saw_errors()); |
ea664253 | 8921 | return context->backend()->error_expression(); |
0f914071 | 8922 | } |
8923 | this->seen_ = true; | |
2c809f8f | 8924 | val = arg_type->array_type()->get_length(gogo, arg); |
0f914071 | 8925 | this->seen_ = false; |
8926 | } | |
0d5530d9 | 8927 | else if (arg_type->map_type() != NULL |
8928 | || arg_type->channel_type() != NULL) | |
8929 | { | |
8930 | // The first field is the length. If the pointer is | |
8931 | // nil, the length is zero. | |
8932 | Type* pint_type = Type::make_pointer_type(int_type); | |
8933 | arg = Expression::make_unsafe_cast(pint_type, arg, location); | |
8934 | Expression* nil = Expression::make_nil(location); | |
8935 | nil = Expression::make_cast(pint_type, nil, location); | |
8936 | Expression* cmp = Expression::make_binary(OPERATOR_EQEQ, | |
8937 | arg, nil, location); | |
8938 | Expression* zero = Expression::make_integer_ul(0, int_type, | |
8939 | location); | |
8940 | Expression* indir = Expression::make_unary(OPERATOR_MULT, | |
8941 | arg, location); | |
8942 | val = Expression::make_conditional(cmp, zero, indir, location); | |
8943 | } | |
e440a328 | 8944 | else |
c3e6f413 | 8945 | go_unreachable(); |
e440a328 | 8946 | } |
8947 | else | |
8948 | { | |
8949 | if (arg_type->array_type() != NULL) | |
0f914071 | 8950 | { |
8951 | if (this->seen_) | |
8952 | { | |
c484d925 | 8953 | go_assert(saw_errors()); |
ea664253 | 8954 | return context->backend()->error_expression(); |
0f914071 | 8955 | } |
8956 | this->seen_ = true; | |
2c809f8f | 8957 | val = arg_type->array_type()->get_capacity(gogo, arg); |
0f914071 | 8958 | this->seen_ = false; |
8959 | } | |
e440a328 | 8960 | else if (arg_type->channel_type() != NULL) |
132ed071 | 8961 | { |
8962 | // The second field is the capacity. If the pointer | |
8963 | // is nil, the capacity is zero. | |
8964 | Type* uintptr_type = Type::lookup_integer_type("uintptr"); | |
8965 | Type* pint_type = Type::make_pointer_type(int_type); | |
8966 | Expression* parg = Expression::make_unsafe_cast(uintptr_type, | |
8967 | arg, | |
8968 | location); | |
8969 | int off = int_type->integer_type()->bits() / 8; | |
8970 | Expression* eoff = Expression::make_integer_ul(off, | |
8971 | uintptr_type, | |
8972 | location); | |
8973 | parg = Expression::make_binary(OPERATOR_PLUS, parg, eoff, | |
8974 | location); | |
8975 | parg = Expression::make_unsafe_cast(pint_type, parg, location); | |
8976 | Expression* nil = Expression::make_nil(location); | |
8977 | nil = Expression::make_cast(pint_type, nil, location); | |
8978 | Expression* cmp = Expression::make_binary(OPERATOR_EQEQ, | |
8979 | arg, nil, location); | |
8980 | Expression* zero = Expression::make_integer_ul(0, int_type, | |
8981 | location); | |
8982 | Expression* indir = Expression::make_unary(OPERATOR_MULT, | |
8983 | parg, location); | |
8984 | val = Expression::make_conditional(cmp, zero, indir, location); | |
8985 | } | |
e440a328 | 8986 | else |
c3e6f413 | 8987 | go_unreachable(); |
e440a328 | 8988 | } |
8989 | ||
2c809f8f | 8990 | return Expression::make_cast(int_type, val, |
ea664253 | 8991 | location)->get_backend(context); |
e440a328 | 8992 | } |
8993 | ||
8994 | case BUILTIN_PRINT: | |
8995 | case BUILTIN_PRINTLN: | |
8996 | { | |
8997 | const bool is_ln = this->code_ == BUILTIN_PRINTLN; | |
88b03a70 | 8998 | |
8999 | Expression* print_stmts = Runtime::make_call(Runtime::PRINTLOCK, | |
9000 | location, 0); | |
e440a328 | 9001 | |
9002 | const Expression_list* call_args = this->args(); | |
9003 | if (call_args != NULL) | |
9004 | { | |
9005 | for (Expression_list::const_iterator p = call_args->begin(); | |
9006 | p != call_args->end(); | |
9007 | ++p) | |
9008 | { | |
9009 | if (is_ln && p != call_args->begin()) | |
9010 | { | |
2c809f8f | 9011 | Expression* print_space = |
88b03a70 | 9012 | Runtime::make_call(Runtime::PRINTSP, location, 0); |
e440a328 | 9013 | |
2c809f8f | 9014 | print_stmts = |
9015 | Expression::make_compound(print_stmts, print_space, | |
9016 | location); | |
9017 | } | |
e440a328 | 9018 | |
2c809f8f | 9019 | Expression* arg = *p; |
9020 | Type* type = arg->type(); | |
9021 | Runtime::Function code; | |
e440a328 | 9022 | if (type->is_string_type()) |
88b03a70 | 9023 | code = Runtime::PRINTSTRING; |
e440a328 | 9024 | else if (type->integer_type() != NULL |
9025 | && type->integer_type()->is_unsigned()) | |
9026 | { | |
e440a328 | 9027 | Type* itype = Type::lookup_integer_type("uint64"); |
2c809f8f | 9028 | arg = Expression::make_cast(itype, arg, location); |
88b03a70 | 9029 | code = Runtime::PRINTUINT; |
e440a328 | 9030 | } |
9031 | else if (type->integer_type() != NULL) | |
9032 | { | |
e440a328 | 9033 | Type* itype = Type::lookup_integer_type("int64"); |
2c809f8f | 9034 | arg = Expression::make_cast(itype, arg, location); |
88b03a70 | 9035 | code = Runtime::PRINTINT; |
e440a328 | 9036 | } |
9037 | else if (type->float_type() != NULL) | |
9038 | { | |
2c809f8f | 9039 | Type* dtype = Type::lookup_float_type("float64"); |
9040 | arg = Expression::make_cast(dtype, arg, location); | |
88b03a70 | 9041 | code = Runtime::PRINTFLOAT; |
e440a328 | 9042 | } |
9043 | else if (type->complex_type() != NULL) | |
9044 | { | |
2c809f8f | 9045 | Type* ctype = Type::lookup_complex_type("complex128"); |
9046 | arg = Expression::make_cast(ctype, arg, location); | |
88b03a70 | 9047 | code = Runtime::PRINTCOMPLEX; |
e440a328 | 9048 | } |
9049 | else if (type->is_boolean_type()) | |
88b03a70 | 9050 | code = Runtime::PRINTBOOL; |
e440a328 | 9051 | else if (type->points_to() != NULL |
9052 | || type->channel_type() != NULL | |
9053 | || type->map_type() != NULL | |
9054 | || type->function_type() != NULL) | |
9055 | { | |
2c809f8f | 9056 | arg = Expression::make_cast(type, arg, location); |
88b03a70 | 9057 | code = Runtime::PRINTPOINTER; |
e440a328 | 9058 | } |
9059 | else if (type->interface_type() != NULL) | |
9060 | { | |
9061 | if (type->interface_type()->is_empty()) | |
88b03a70 | 9062 | code = Runtime::PRINTEFACE; |
e440a328 | 9063 | else |
88b03a70 | 9064 | code = Runtime::PRINTIFACE; |
e440a328 | 9065 | } |
411eb89e | 9066 | else if (type->is_slice_type()) |
88b03a70 | 9067 | code = Runtime::PRINTSLICE; |
e440a328 | 9068 | else |
cd238b8d | 9069 | { |
9070 | go_assert(saw_errors()); | |
ea664253 | 9071 | return context->backend()->error_expression(); |
cd238b8d | 9072 | } |
e440a328 | 9073 | |
2c809f8f | 9074 | Expression* call = Runtime::make_call(code, location, 1, arg); |
88b03a70 | 9075 | print_stmts = Expression::make_compound(print_stmts, call, |
9076 | location); | |
e440a328 | 9077 | } |
9078 | } | |
9079 | ||
9080 | if (is_ln) | |
9081 | { | |
2c809f8f | 9082 | Expression* print_nl = |
88b03a70 | 9083 | Runtime::make_call(Runtime::PRINTNL, location, 0); |
9084 | print_stmts = Expression::make_compound(print_stmts, print_nl, | |
9085 | location); | |
e440a328 | 9086 | } |
9087 | ||
88b03a70 | 9088 | Expression* unlock = Runtime::make_call(Runtime::PRINTUNLOCK, |
9089 | location, 0); | |
9090 | print_stmts = Expression::make_compound(print_stmts, unlock, location); | |
32e3ff69 | 9091 | |
ea664253 | 9092 | return print_stmts->get_backend(context); |
e440a328 | 9093 | } |
9094 | ||
9095 | case BUILTIN_PANIC: | |
9096 | { | |
9097 | const Expression_list* args = this->args(); | |
c484d925 | 9098 | go_assert(args != NULL && args->size() == 1); |
e440a328 | 9099 | Expression* arg = args->front(); |
b13c66cd | 9100 | Type *empty = |
823c7e3d | 9101 | Type::make_empty_interface_type(Linemap::predeclared_location()); |
2c809f8f | 9102 | arg = Expression::convert_for_assignment(gogo, empty, arg, location); |
9103 | ||
9104 | Expression* panic = | |
03ac9de4 | 9105 | Runtime::make_call(Runtime::GOPANIC, location, 1, arg); |
ea664253 | 9106 | return panic->get_backend(context); |
e440a328 | 9107 | } |
9108 | ||
9109 | case BUILTIN_RECOVER: | |
9110 | { | |
9111 | // The argument is set when building recover thunks. It's a | |
9112 | // boolean value which is true if we can recover a value now. | |
9113 | const Expression_list* args = this->args(); | |
c484d925 | 9114 | go_assert(args != NULL && args->size() == 1); |
e440a328 | 9115 | Expression* arg = args->front(); |
b13c66cd | 9116 | Type *empty = |
823c7e3d | 9117 | Type::make_empty_interface_type(Linemap::predeclared_location()); |
e440a328 | 9118 | |
e440a328 | 9119 | Expression* nil = Expression::make_nil(location); |
2c809f8f | 9120 | nil = Expression::convert_for_assignment(gogo, empty, nil, location); |
e440a328 | 9121 | |
9122 | // We need to handle a deferred call to recover specially, | |
9123 | // because it changes whether it can recover a panic or not. | |
9124 | // See test7 in test/recover1.go. | |
2c809f8f | 9125 | Expression* recover = Runtime::make_call((this->is_deferred() |
03ac9de4 | 9126 | ? Runtime::DEFERREDRECOVER |
9127 | : Runtime::GORECOVER), | |
2c809f8f | 9128 | location, 0); |
9129 | Expression* cond = | |
9130 | Expression::make_conditional(arg, recover, nil, location); | |
ea664253 | 9131 | return cond->get_backend(context); |
e440a328 | 9132 | } |
9133 | ||
9134 | case BUILTIN_CLOSE: | |
e440a328 | 9135 | { |
9136 | const Expression_list* args = this->args(); | |
c484d925 | 9137 | go_assert(args != NULL && args->size() == 1); |
e440a328 | 9138 | Expression* arg = args->front(); |
2c809f8f | 9139 | Expression* close = Runtime::make_call(Runtime::CLOSE, location, |
9140 | 1, arg); | |
ea664253 | 9141 | return close->get_backend(context); |
e440a328 | 9142 | } |
9143 | ||
9144 | case BUILTIN_SIZEOF: | |
9145 | case BUILTIN_OFFSETOF: | |
9146 | case BUILTIN_ALIGNOF: | |
9147 | { | |
0c77715b | 9148 | Numeric_constant nc; |
9149 | unsigned long val; | |
9150 | if (!this->numeric_constant_value(&nc) | |
9151 | || nc.to_unsigned_long(&val) != Numeric_constant::NC_UL_VALID) | |
7f1d9abd | 9152 | { |
c484d925 | 9153 | go_assert(saw_errors()); |
ea664253 | 9154 | return context->backend()->error_expression(); |
7f1d9abd | 9155 | } |
7ba86326 | 9156 | Type* uintptr_type = Type::lookup_integer_type("uintptr"); |
2c809f8f | 9157 | mpz_t ival; |
9158 | nc.get_int(&ival); | |
9159 | Expression* int_cst = | |
e67508fa | 9160 | Expression::make_integer_z(&ival, uintptr_type, location); |
2c809f8f | 9161 | mpz_clear(ival); |
ea664253 | 9162 | return int_cst->get_backend(context); |
e440a328 | 9163 | } |
9164 | ||
9165 | case BUILTIN_COPY: | |
9166 | { | |
9167 | const Expression_list* args = this->args(); | |
c484d925 | 9168 | go_assert(args != NULL && args->size() == 2); |
e440a328 | 9169 | Expression* arg1 = args->front(); |
9170 | Expression* arg2 = args->back(); | |
9171 | ||
e440a328 | 9172 | Type* arg1_type = arg1->type(); |
9173 | Array_type* at = arg1_type->array_type(); | |
35a54f17 | 9174 | go_assert(arg1->is_variable()); |
321e5ad2 | 9175 | |
9176 | Expression* call; | |
e440a328 | 9177 | |
9178 | Type* arg2_type = arg2->type(); | |
2c809f8f | 9179 | go_assert(arg2->is_variable()); |
321e5ad2 | 9180 | if (arg2_type->is_string_type()) |
9181 | call = Runtime::make_call(Runtime::SLICESTRINGCOPY, location, | |
9182 | 2, arg1, arg2); | |
e440a328 | 9183 | else |
9184 | { | |
321e5ad2 | 9185 | Type* et = at->element_type(); |
9186 | if (et->has_pointer()) | |
9187 | { | |
9188 | Expression* td = Expression::make_type_descriptor(et, | |
9189 | location); | |
9190 | call = Runtime::make_call(Runtime::TYPEDSLICECOPY, location, | |
9191 | 3, td, arg1, arg2); | |
9192 | } | |
9193 | else | |
9194 | { | |
9195 | Expression* sz = Expression::make_type_info(et, | |
9196 | TYPE_INFO_SIZE); | |
9197 | call = Runtime::make_call(Runtime::SLICECOPY, location, 3, | |
9198 | arg1, arg2, sz); | |
9199 | } | |
e440a328 | 9200 | } |
2c809f8f | 9201 | |
321e5ad2 | 9202 | return call->get_backend(context); |
e440a328 | 9203 | } |
9204 | ||
9205 | case BUILTIN_APPEND: | |
321e5ad2 | 9206 | // Handled in Builtin_call_expression::flatten_append. |
9207 | go_unreachable(); | |
e440a328 | 9208 | |
9209 | case BUILTIN_REAL: | |
9210 | case BUILTIN_IMAG: | |
9211 | { | |
9212 | const Expression_list* args = this->args(); | |
c484d925 | 9213 | go_assert(args != NULL && args->size() == 1); |
2c809f8f | 9214 | |
9215 | Bexpression* ret; | |
ea664253 | 9216 | Bexpression* bcomplex = args->front()->get_backend(context); |
2c809f8f | 9217 | if (this->code_ == BUILTIN_REAL) |
9218 | ret = gogo->backend()->real_part_expression(bcomplex, location); | |
9219 | else | |
9220 | ret = gogo->backend()->imag_part_expression(bcomplex, location); | |
ea664253 | 9221 | return ret; |
e440a328 | 9222 | } |
9223 | ||
48080209 | 9224 | case BUILTIN_COMPLEX: |
e440a328 | 9225 | { |
9226 | const Expression_list* args = this->args(); | |
c484d925 | 9227 | go_assert(args != NULL && args->size() == 2); |
ea664253 | 9228 | Bexpression* breal = args->front()->get_backend(context); |
9229 | Bexpression* bimag = args->back()->get_backend(context); | |
9230 | return gogo->backend()->complex_expression(breal, bimag, location); | |
e440a328 | 9231 | } |
9232 | ||
9233 | default: | |
c3e6f413 | 9234 | go_unreachable(); |
e440a328 | 9235 | } |
9236 | } | |
9237 | ||
9238 | // We have to support exporting a builtin call expression, because | |
9239 | // code can set a constant to the result of a builtin expression. | |
9240 | ||
9241 | void | |
9242 | Builtin_call_expression::do_export(Export* exp) const | |
9243 | { | |
0c77715b | 9244 | Numeric_constant nc; |
9245 | if (!this->numeric_constant_value(&nc)) | |
9246 | { | |
631d5788 | 9247 | go_error_at(this->location(), "value is not constant"); |
0c77715b | 9248 | return; |
9249 | } | |
e440a328 | 9250 | |
0c77715b | 9251 | if (nc.is_int()) |
e440a328 | 9252 | { |
0c77715b | 9253 | mpz_t val; |
9254 | nc.get_int(&val); | |
e440a328 | 9255 | Integer_expression::export_integer(exp, val); |
0c77715b | 9256 | mpz_clear(val); |
e440a328 | 9257 | } |
0c77715b | 9258 | else if (nc.is_float()) |
e440a328 | 9259 | { |
9260 | mpfr_t fval; | |
0c77715b | 9261 | nc.get_float(&fval); |
9262 | Float_expression::export_float(exp, fval); | |
e440a328 | 9263 | mpfr_clear(fval); |
9264 | } | |
0c77715b | 9265 | else if (nc.is_complex()) |
e440a328 | 9266 | { |
fcbea5e4 | 9267 | mpc_t cval; |
9268 | nc.get_complex(&cval); | |
9269 | Complex_expression::export_complex(exp, cval); | |
9270 | mpc_clear(cval); | |
e440a328 | 9271 | } |
0c77715b | 9272 | else |
9273 | go_unreachable(); | |
e440a328 | 9274 | |
9275 | // A trailing space lets us reliably identify the end of the number. | |
9276 | exp->write_c_string(" "); | |
9277 | } | |
9278 | ||
9279 | // Class Call_expression. | |
9280 | ||
8381eda7 | 9281 | // A Go function can be viewed in a couple of different ways. The |
9282 | // code of a Go function becomes a backend function with parameters | |
9283 | // whose types are simply the backend representation of the Go types. | |
9284 | // If there are multiple results, they are returned as a backend | |
9285 | // struct. | |
9286 | ||
9287 | // However, when Go code refers to a function other than simply | |
9288 | // calling it, the backend type of that function is actually a struct. | |
9289 | // The first field of the struct points to the Go function code | |
9290 | // (sometimes a wrapper as described below). The remaining fields | |
9291 | // hold addresses of closed-over variables. This struct is called a | |
9292 | // closure. | |
9293 | ||
9294 | // There are a few cases to consider. | |
9295 | ||
9296 | // A direct function call of a known function in package scope. In | |
9297 | // this case there are no closed-over variables, and we know the name | |
9298 | // of the function code. We can simply produce a backend call to the | |
9299 | // function directly, and not worry about the closure. | |
9300 | ||
9301 | // A direct function call of a known function literal. In this case | |
9302 | // we know the function code and we know the closure. We generate the | |
9303 | // function code such that it expects an additional final argument of | |
9304 | // the closure type. We pass the closure as the last argument, after | |
9305 | // the other arguments. | |
9306 | ||
9307 | // An indirect function call. In this case we have a closure. We | |
9308 | // load the pointer to the function code from the first field of the | |
9309 | // closure. We pass the address of the closure as the last argument. | |
9310 | ||
9311 | // A call to a method of an interface. Type methods are always at | |
9312 | // package scope, so we call the function directly, and don't worry | |
9313 | // about the closure. | |
9314 | ||
9315 | // This means that for a function at package scope we have two cases. | |
9316 | // One is the direct call, which has no closure. The other is the | |
9317 | // indirect call, which does have a closure. We can't simply ignore | |
9318 | // the closure, even though it is the last argument, because that will | |
9319 | // fail on targets where the function pops its arguments. So when | |
9320 | // generating a closure for a package-scope function we set the | |
9321 | // function code pointer in the closure to point to a wrapper | |
9322 | // function. This wrapper function accepts a final argument that | |
9323 | // points to the closure, ignores it, and calls the real function as a | |
9324 | // direct function call. This wrapper will normally be efficient, and | |
9325 | // can often simply be a tail call to the real function. | |
9326 | ||
9327 | // We don't use GCC's static chain pointer because 1) we don't need | |
9328 | // it; 2) GCC only permits using a static chain to call a known | |
9329 | // function, so we can't use it for an indirect call anyhow. Since we | |
9330 | // can't use it for an indirect call, we may as well not worry about | |
9331 | // using it for a direct call either. | |
9332 | ||
9333 | // We pass the closure last rather than first because it means that | |
9334 | // the function wrapper we put into a closure for a package-scope | |
9335 | // function can normally just be a tail call to the real function. | |
9336 | ||
9337 | // For method expressions we generate a wrapper that loads the | |
9338 | // receiver from the closure and then calls the method. This | |
9339 | // unfortunately forces reshuffling the arguments, since there is a | |
9340 | // new first argument, but we can't avoid reshuffling either for | |
9341 | // method expressions or for indirect calls of package-scope | |
9342 | // functions, and since the latter are more common we reshuffle for | |
9343 | // method expressions. | |
9344 | ||
9345 | // Note that the Go code retains the Go types. The extra final | |
9346 | // argument only appears when we convert to the backend | |
9347 | // representation. | |
9348 | ||
e440a328 | 9349 | // Traversal. |
9350 | ||
9351 | int | |
9352 | Call_expression::do_traverse(Traverse* traverse) | |
9353 | { | |
0c0dacab | 9354 | // If we are calling a function in a different package that returns |
9355 | // an unnamed type, this may be the only chance we get to traverse | |
9356 | // that type. We don't traverse this->type_ because it may be a | |
9357 | // Call_multiple_result_type that will just lead back here. | |
9358 | if (this->type_ != NULL && !this->type_->is_error_type()) | |
9359 | { | |
9360 | Function_type *fntype = this->get_function_type(); | |
9361 | if (fntype != NULL && Type::traverse(fntype, traverse) == TRAVERSE_EXIT) | |
9362 | return TRAVERSE_EXIT; | |
9363 | } | |
e440a328 | 9364 | if (Expression::traverse(&this->fn_, traverse) == TRAVERSE_EXIT) |
9365 | return TRAVERSE_EXIT; | |
9366 | if (this->args_ != NULL) | |
9367 | { | |
9368 | if (this->args_->traverse(traverse) == TRAVERSE_EXIT) | |
9369 | return TRAVERSE_EXIT; | |
9370 | } | |
9371 | return TRAVERSE_CONTINUE; | |
9372 | } | |
9373 | ||
9374 | // Lower a call statement. | |
9375 | ||
9376 | Expression* | |
ceeb4318 | 9377 | Call_expression::do_lower(Gogo* gogo, Named_object* function, |
9378 | Statement_inserter* inserter, int) | |
e440a328 | 9379 | { |
b13c66cd | 9380 | Location loc = this->location(); |
09ea332d | 9381 | |
ceeb4318 | 9382 | // A type cast can look like a function call. |
e440a328 | 9383 | if (this->fn_->is_type_expression() |
9384 | && this->args_ != NULL | |
9385 | && this->args_->size() == 1) | |
9386 | return Expression::make_cast(this->fn_->type(), this->args_->front(), | |
09ea332d | 9387 | loc); |
e440a328 | 9388 | |
88f06749 | 9389 | // Because do_type will return an error type and thus prevent future |
9390 | // errors, check for that case now to ensure that the error gets | |
9391 | // reported. | |
37448b10 | 9392 | Function_type* fntype = this->get_function_type(); |
9393 | if (fntype == NULL) | |
88f06749 | 9394 | { |
9395 | if (!this->fn_->type()->is_error()) | |
9396 | this->report_error(_("expected function")); | |
5f1045b5 | 9397 | this->set_is_error(); |
9398 | return this; | |
88f06749 | 9399 | } |
9400 | ||
e440a328 | 9401 | // Handle an argument which is a call to a function which returns |
9402 | // multiple results. | |
9403 | if (this->args_ != NULL | |
9404 | && this->args_->size() == 1 | |
37448b10 | 9405 | && this->args_->front()->call_expression() != NULL) |
e440a328 | 9406 | { |
e440a328 | 9407 | size_t rc = this->args_->front()->call_expression()->result_count(); |
9408 | if (rc > 1 | |
37448b10 | 9409 | && ((fntype->parameters() != NULL |
9410 | && (fntype->parameters()->size() == rc | |
9411 | || (fntype->is_varargs() | |
9412 | && fntype->parameters()->size() - 1 <= rc))) | |
9413 | || fntype->is_builtin())) | |
e440a328 | 9414 | { |
9415 | Call_expression* call = this->args_->front()->call_expression(); | |
e90ecd2d | 9416 | call->set_is_multi_value_arg(); |
c33af8e4 | 9417 | if (this->is_varargs_) |
9418 | { | |
9419 | // It is not clear which result of a multiple result call | |
9420 | // the ellipsis operator should be applied to. If we unpack the | |
9421 | // the call into its individual results here, the ellipsis will be | |
9422 | // applied to the last result. | |
631d5788 | 9423 | go_error_at(call->location(), |
9424 | _("multiple-value argument in single-value context")); | |
c33af8e4 | 9425 | return Expression::make_error(call->location()); |
9426 | } | |
9427 | ||
e440a328 | 9428 | Expression_list* args = new Expression_list; |
9429 | for (size_t i = 0; i < rc; ++i) | |
9430 | args->push_back(Expression::make_call_result(call, i)); | |
9431 | // We can't return a new call expression here, because this | |
42535814 | 9432 | // one may be referenced by Call_result expressions. We |
9433 | // also can't delete the old arguments, because we may still | |
9434 | // traverse them somewhere up the call stack. FIXME. | |
e440a328 | 9435 | this->args_ = args; |
9436 | } | |
9437 | } | |
9438 | ||
37448b10 | 9439 | // Recognize a call to a builtin function. |
9440 | if (fntype->is_builtin()) | |
9441 | return new Builtin_call_expression(gogo, this->fn_, this->args_, | |
9442 | this->is_varargs_, loc); | |
9443 | ||
ceeb4318 | 9444 | // If this call returns multiple results, create a temporary |
9445 | // variable for each result. | |
9446 | size_t rc = this->result_count(); | |
9447 | if (rc > 1 && this->results_ == NULL) | |
9448 | { | |
9449 | std::vector<Temporary_statement*>* temps = | |
9450 | new std::vector<Temporary_statement*>; | |
9451 | temps->reserve(rc); | |
37448b10 | 9452 | const Typed_identifier_list* results = fntype->results(); |
ceeb4318 | 9453 | for (Typed_identifier_list::const_iterator p = results->begin(); |
9454 | p != results->end(); | |
9455 | ++p) | |
9456 | { | |
9457 | Temporary_statement* temp = Statement::make_temporary(p->type(), | |
09ea332d | 9458 | NULL, loc); |
ceeb4318 | 9459 | inserter->insert(temp); |
9460 | temps->push_back(temp); | |
9461 | } | |
9462 | this->results_ = temps; | |
9463 | } | |
9464 | ||
e440a328 | 9465 | // Handle a call to a varargs function by packaging up the extra |
9466 | // parameters. | |
37448b10 | 9467 | if (fntype->is_varargs()) |
e440a328 | 9468 | { |
e440a328 | 9469 | const Typed_identifier_list* parameters = fntype->parameters(); |
c484d925 | 9470 | go_assert(parameters != NULL && !parameters->empty()); |
e440a328 | 9471 | Type* varargs_type = parameters->back().type(); |
09ea332d | 9472 | this->lower_varargs(gogo, function, inserter, varargs_type, |
0e9a2e72 | 9473 | parameters->size(), SLICE_STORAGE_MAY_ESCAPE); |
09ea332d | 9474 | } |
9475 | ||
9476 | // If this is call to a method, call the method directly passing the | |
9477 | // object as the first parameter. | |
9478 | Bound_method_expression* bme = this->fn_->bound_method_expression(); | |
9479 | if (bme != NULL) | |
9480 | { | |
0afbb937 | 9481 | Named_object* methodfn = bme->function(); |
09ea332d | 9482 | Expression* first_arg = bme->first_argument(); |
9483 | ||
9484 | // We always pass a pointer when calling a method. | |
9485 | if (first_arg->type()->points_to() == NULL | |
9486 | && !first_arg->type()->is_error()) | |
9487 | { | |
9488 | first_arg = Expression::make_unary(OPERATOR_AND, first_arg, loc); | |
9489 | // We may need to create a temporary variable so that we can | |
9490 | // take the address. We can't do that here because it will | |
9491 | // mess up the order of evaluation. | |
9492 | Unary_expression* ue = static_cast<Unary_expression*>(first_arg); | |
9493 | ue->set_create_temp(); | |
9494 | } | |
9495 | ||
9496 | // If we are calling a method which was inherited from an | |
9497 | // embedded struct, and the method did not get a stub, then the | |
9498 | // first type may be wrong. | |
9499 | Type* fatype = bme->first_argument_type(); | |
9500 | if (fatype != NULL) | |
9501 | { | |
9502 | if (fatype->points_to() == NULL) | |
9503 | fatype = Type::make_pointer_type(fatype); | |
9504 | first_arg = Expression::make_unsafe_cast(fatype, first_arg, loc); | |
9505 | } | |
9506 | ||
9507 | Expression_list* new_args = new Expression_list(); | |
9508 | new_args->push_back(first_arg); | |
9509 | if (this->args_ != NULL) | |
9510 | { | |
9511 | for (Expression_list::const_iterator p = this->args_->begin(); | |
9512 | p != this->args_->end(); | |
9513 | ++p) | |
9514 | new_args->push_back(*p); | |
9515 | } | |
9516 | ||
9517 | // We have to change in place because this structure may be | |
9518 | // referenced by Call_result_expressions. We can't delete the | |
9519 | // old arguments, because we may be traversing them up in some | |
9520 | // caller. FIXME. | |
9521 | this->args_ = new_args; | |
0afbb937 | 9522 | this->fn_ = Expression::make_func_reference(methodfn, NULL, |
09ea332d | 9523 | bme->location()); |
e440a328 | 9524 | } |
9525 | ||
105f9a24 | 9526 | // Handle a couple of special runtime functions. In the runtime |
9527 | // package, getcallerpc returns the PC of the caller, and | |
9528 | // getcallersp returns the frame pointer of the caller. Implement | |
9529 | // these by turning them into calls to GCC builtin functions. We | |
9530 | // could implement them in normal code, but then we would have to | |
9531 | // explicitly unwind the stack. These functions are intended to be | |
9532 | // efficient. Note that this technique obviously only works for | |
9533 | // direct calls, but that is the only way they are used. The actual | |
9534 | // argument to these functions is always the address of a parameter; | |
9535 | // we don't need that for the GCC builtin functions, so we just | |
9536 | // ignore it. | |
9537 | if (gogo->compiling_runtime() | |
9538 | && this->args_ != NULL | |
9539 | && this->args_->size() == 1 | |
9540 | && gogo->package_name() == "runtime") | |
9541 | { | |
9542 | Func_expression* fe = this->fn_->func_expression(); | |
9543 | if (fe != NULL | |
9544 | && fe->named_object()->is_function_declaration() | |
9545 | && fe->named_object()->package() == NULL) | |
9546 | { | |
9547 | std::string n = Gogo::unpack_hidden_name(fe->named_object()->name()); | |
9548 | if (n == "getcallerpc") | |
9549 | { | |
9550 | static Named_object* builtin_return_address; | |
9551 | return this->lower_to_builtin(&builtin_return_address, | |
9552 | "__builtin_return_address", | |
9553 | 0); | |
9554 | } | |
9555 | else if (n == "getcallersp") | |
9556 | { | |
9557 | static Named_object* builtin_frame_address; | |
9558 | return this->lower_to_builtin(&builtin_frame_address, | |
9559 | "__builtin_frame_address", | |
9560 | 1); | |
9561 | } | |
9562 | } | |
9563 | } | |
9564 | ||
e440a328 | 9565 | return this; |
9566 | } | |
9567 | ||
9568 | // Lower a call to a varargs function. FUNCTION is the function in | |
9569 | // which the call occurs--it's not the function we are calling. | |
9570 | // VARARGS_TYPE is the type of the varargs parameter, a slice type. | |
9571 | // PARAM_COUNT is the number of parameters of the function we are | |
9572 | // calling; the last of these parameters will be the varargs | |
9573 | // parameter. | |
9574 | ||
09ea332d | 9575 | void |
e440a328 | 9576 | Call_expression::lower_varargs(Gogo* gogo, Named_object* function, |
ceeb4318 | 9577 | Statement_inserter* inserter, |
0e9a2e72 | 9578 | Type* varargs_type, size_t param_count, |
9579 | Slice_storage_escape_disp escape_disp) | |
e440a328 | 9580 | { |
03118c21 | 9581 | // When compiling the runtime, varargs slices do not escape. When |
9582 | // escape analysis becomes the default, this should be changed to | |
9583 | // make it an error if we have a varargs slice that escapes. | |
9584 | if (gogo->compiling_runtime() && gogo->package_name() == "runtime") | |
9585 | escape_disp = SLICE_STORAGE_DOES_NOT_ESCAPE; | |
9586 | ||
e440a328 | 9587 | if (this->varargs_are_lowered_) |
09ea332d | 9588 | return; |
e440a328 | 9589 | |
b13c66cd | 9590 | Location loc = this->location(); |
e440a328 | 9591 | |
c484d925 | 9592 | go_assert(param_count > 0); |
411eb89e | 9593 | go_assert(varargs_type->is_slice_type()); |
e440a328 | 9594 | |
9595 | size_t arg_count = this->args_ == NULL ? 0 : this->args_->size(); | |
9596 | if (arg_count < param_count - 1) | |
9597 | { | |
9598 | // Not enough arguments; will be caught in check_types. | |
09ea332d | 9599 | return; |
e440a328 | 9600 | } |
9601 | ||
9602 | Expression_list* old_args = this->args_; | |
9603 | Expression_list* new_args = new Expression_list(); | |
9604 | bool push_empty_arg = false; | |
9605 | if (old_args == NULL || old_args->empty()) | |
9606 | { | |
c484d925 | 9607 | go_assert(param_count == 1); |
e440a328 | 9608 | push_empty_arg = true; |
9609 | } | |
9610 | else | |
9611 | { | |
9612 | Expression_list::const_iterator pa; | |
9613 | int i = 1; | |
9614 | for (pa = old_args->begin(); pa != old_args->end(); ++pa, ++i) | |
9615 | { | |
9616 | if (static_cast<size_t>(i) == param_count) | |
9617 | break; | |
9618 | new_args->push_back(*pa); | |
9619 | } | |
9620 | ||
9621 | // We have reached the varargs parameter. | |
9622 | ||
9623 | bool issued_error = false; | |
9624 | if (pa == old_args->end()) | |
9625 | push_empty_arg = true; | |
9626 | else if (pa + 1 == old_args->end() && this->is_varargs_) | |
9627 | new_args->push_back(*pa); | |
9628 | else if (this->is_varargs_) | |
9629 | { | |
a6645f74 | 9630 | if ((*pa)->type()->is_slice_type()) |
9631 | this->report_error(_("too many arguments")); | |
9632 | else | |
9633 | { | |
631d5788 | 9634 | go_error_at(this->location(), |
9635 | _("invalid use of %<...%> with non-slice")); | |
a6645f74 | 9636 | this->set_is_error(); |
9637 | } | |
09ea332d | 9638 | return; |
e440a328 | 9639 | } |
e440a328 | 9640 | else |
9641 | { | |
9642 | Type* element_type = varargs_type->array_type()->element_type(); | |
9643 | Expression_list* vals = new Expression_list; | |
9644 | for (; pa != old_args->end(); ++pa, ++i) | |
9645 | { | |
9646 | // Check types here so that we get a better message. | |
9647 | Type* patype = (*pa)->type(); | |
b13c66cd | 9648 | Location paloc = (*pa)->location(); |
e440a328 | 9649 | if (!this->check_argument_type(i, element_type, patype, |
9650 | paloc, issued_error)) | |
9651 | continue; | |
9652 | vals->push_back(*pa); | |
9653 | } | |
0e9a2e72 | 9654 | Slice_construction_expression* sce = |
e440a328 | 9655 | Expression::make_slice_composite_literal(varargs_type, vals, loc); |
0e9a2e72 | 9656 | if (escape_disp == SLICE_STORAGE_DOES_NOT_ESCAPE) |
9657 | sce->set_storage_does_not_escape(); | |
9658 | Expression* val = sce; | |
09ea332d | 9659 | gogo->lower_expression(function, inserter, &val); |
e440a328 | 9660 | new_args->push_back(val); |
9661 | } | |
9662 | } | |
9663 | ||
9664 | if (push_empty_arg) | |
9665 | new_args->push_back(Expression::make_nil(loc)); | |
9666 | ||
9667 | // We can't return a new call expression here, because this one may | |
6d4c2432 | 9668 | // be referenced by Call_result expressions. FIXME. We can't |
9669 | // delete OLD_ARGS because we may have both a Call_expression and a | |
9670 | // Builtin_call_expression which refer to them. FIXME. | |
e440a328 | 9671 | this->args_ = new_args; |
9672 | this->varargs_are_lowered_ = true; | |
e440a328 | 9673 | } |
9674 | ||
105f9a24 | 9675 | // Return a call to __builtin_return_address or __builtin_frame_address. |
9676 | ||
9677 | Expression* | |
9678 | Call_expression::lower_to_builtin(Named_object** pno, const char* name, | |
9679 | int arg) | |
9680 | { | |
9681 | if (*pno == NULL) | |
9682 | *pno = Gogo::declare_builtin_rf_address(name); | |
9683 | ||
9684 | Location loc = this->location(); | |
9685 | ||
9686 | Expression* fn = Expression::make_func_reference(*pno, NULL, loc); | |
9687 | Expression* a = Expression::make_integer_ul(arg, NULL, loc); | |
9688 | Expression_list *args = new Expression_list(); | |
9689 | args->push_back(a); | |
9690 | Expression* call = Expression::make_call(fn, args, false, loc); | |
9691 | ||
9692 | // The builtin functions return void*, but the Go functions return uintptr. | |
9693 | Type* uintptr_type = Type::lookup_integer_type("uintptr"); | |
9694 | return Expression::make_cast(uintptr_type, call, loc); | |
9695 | } | |
9696 | ||
2c809f8f | 9697 | // Flatten a call with multiple results into a temporary. |
9698 | ||
9699 | Expression* | |
b8e86a51 | 9700 | Call_expression::do_flatten(Gogo* gogo, Named_object*, |
9701 | Statement_inserter* inserter) | |
2c809f8f | 9702 | { |
5bf8be8b | 9703 | if (this->is_erroneous_call()) |
9704 | { | |
9705 | go_assert(saw_errors()); | |
9706 | return Expression::make_error(this->location()); | |
9707 | } | |
b8e86a51 | 9708 | |
91c0fd76 | 9709 | if (this->is_flattened_) |
9710 | return this; | |
9711 | this->is_flattened_ = true; | |
9712 | ||
b8e86a51 | 9713 | // Add temporary variables for all arguments that require type |
9714 | // conversion. | |
9715 | Function_type* fntype = this->get_function_type(); | |
9782d556 | 9716 | if (fntype == NULL) |
9717 | { | |
9718 | go_assert(saw_errors()); | |
9719 | return this; | |
9720 | } | |
b8e86a51 | 9721 | if (this->args_ != NULL && !this->args_->empty() |
9722 | && fntype->parameters() != NULL && !fntype->parameters()->empty()) | |
9723 | { | |
9724 | bool is_interface_method = | |
9725 | this->fn_->interface_field_reference_expression() != NULL; | |
9726 | ||
9727 | Expression_list *args = new Expression_list(); | |
9728 | Typed_identifier_list::const_iterator pp = fntype->parameters()->begin(); | |
9729 | Expression_list::const_iterator pa = this->args_->begin(); | |
9730 | if (!is_interface_method && fntype->is_method()) | |
9731 | { | |
9732 | // The receiver argument. | |
9733 | args->push_back(*pa); | |
9734 | ++pa; | |
9735 | } | |
9736 | for (; pa != this->args_->end(); ++pa, ++pp) | |
9737 | { | |
9738 | go_assert(pp != fntype->parameters()->end()); | |
9739 | if (Type::are_identical(pp->type(), (*pa)->type(), true, NULL)) | |
9740 | args->push_back(*pa); | |
9741 | else | |
9742 | { | |
9743 | Location loc = (*pa)->location(); | |
8ba8cc87 | 9744 | Expression* arg = *pa; |
9745 | if (!arg->is_variable()) | |
9746 | { | |
9747 | Temporary_statement *temp = | |
9748 | Statement::make_temporary(NULL, arg, loc); | |
9749 | inserter->insert(temp); | |
9750 | arg = Expression::make_temporary_reference(temp, loc); | |
9751 | } | |
9752 | arg = Expression::convert_for_assignment(gogo, pp->type(), arg, | |
9753 | loc); | |
9754 | args->push_back(arg); | |
b8e86a51 | 9755 | } |
9756 | } | |
9757 | delete this->args_; | |
9758 | this->args_ = args; | |
9759 | } | |
9760 | ||
2c809f8f | 9761 | size_t rc = this->result_count(); |
9762 | if (rc > 1 && this->call_temp_ == NULL) | |
9763 | { | |
9764 | Struct_field_list* sfl = new Struct_field_list(); | |
9765 | Function_type* fntype = this->get_function_type(); | |
9766 | const Typed_identifier_list* results = fntype->results(); | |
9767 | Location loc = this->location(); | |
9768 | ||
9769 | int i = 0; | |
61575e0f | 9770 | char buf[20]; |
2c809f8f | 9771 | for (Typed_identifier_list::const_iterator p = results->begin(); |
9772 | p != results->end(); | |
9773 | ++p, ++i) | |
9774 | { | |
9775 | snprintf(buf, sizeof buf, "res%d", i); | |
9776 | sfl->push_back(Struct_field(Typed_identifier(buf, p->type(), loc))); | |
9777 | } | |
9778 | ||
9779 | Struct_type* st = Type::make_struct_type(sfl, loc); | |
6bf4793c | 9780 | st->set_is_struct_incomparable(); |
2c809f8f | 9781 | this->call_temp_ = Statement::make_temporary(st, NULL, loc); |
9782 | inserter->insert(this->call_temp_); | |
9783 | } | |
9784 | ||
9785 | return this; | |
9786 | } | |
9787 | ||
ceeb4318 | 9788 | // Get the function type. This can return NULL in error cases. |
e440a328 | 9789 | |
9790 | Function_type* | |
9791 | Call_expression::get_function_type() const | |
9792 | { | |
9793 | return this->fn_->type()->function_type(); | |
9794 | } | |
9795 | ||
9796 | // Return the number of values which this call will return. | |
9797 | ||
9798 | size_t | |
9799 | Call_expression::result_count() const | |
9800 | { | |
9801 | const Function_type* fntype = this->get_function_type(); | |
9802 | if (fntype == NULL) | |
9803 | return 0; | |
9804 | if (fntype->results() == NULL) | |
9805 | return 0; | |
9806 | return fntype->results()->size(); | |
9807 | } | |
9808 | ||
ceeb4318 | 9809 | // Return the temporary which holds a result. |
9810 | ||
9811 | Temporary_statement* | |
9812 | Call_expression::result(size_t i) const | |
9813 | { | |
cd238b8d | 9814 | if (this->results_ == NULL || this->results_->size() <= i) |
9815 | { | |
9816 | go_assert(saw_errors()); | |
9817 | return NULL; | |
9818 | } | |
ceeb4318 | 9819 | return (*this->results_)[i]; |
9820 | } | |
9821 | ||
1373401e | 9822 | // Set the number of results expected from a call expression. |
9823 | ||
9824 | void | |
9825 | Call_expression::set_expected_result_count(size_t count) | |
9826 | { | |
9827 | go_assert(this->expected_result_count_ == 0); | |
9828 | this->expected_result_count_ = count; | |
9829 | } | |
9830 | ||
e440a328 | 9831 | // Return whether this is a call to the predeclared function recover. |
9832 | ||
9833 | bool | |
9834 | Call_expression::is_recover_call() const | |
9835 | { | |
9836 | return this->do_is_recover_call(); | |
9837 | } | |
9838 | ||
9839 | // Set the argument to the recover function. | |
9840 | ||
9841 | void | |
9842 | Call_expression::set_recover_arg(Expression* arg) | |
9843 | { | |
9844 | this->do_set_recover_arg(arg); | |
9845 | } | |
9846 | ||
9847 | // Virtual functions also implemented by Builtin_call_expression. | |
9848 | ||
9849 | bool | |
9850 | Call_expression::do_is_recover_call() const | |
9851 | { | |
9852 | return false; | |
9853 | } | |
9854 | ||
9855 | void | |
9856 | Call_expression::do_set_recover_arg(Expression*) | |
9857 | { | |
c3e6f413 | 9858 | go_unreachable(); |
e440a328 | 9859 | } |
9860 | ||
ceeb4318 | 9861 | // We have found an error with this call expression; return true if |
9862 | // we should report it. | |
9863 | ||
9864 | bool | |
9865 | Call_expression::issue_error() | |
9866 | { | |
9867 | if (this->issued_error_) | |
9868 | return false; | |
9869 | else | |
9870 | { | |
9871 | this->issued_error_ = true; | |
9872 | return true; | |
9873 | } | |
9874 | } | |
9875 | ||
5bf8be8b | 9876 | // Whether or not this call contains errors, either in the call or the |
9877 | // arguments to the call. | |
9878 | ||
9879 | bool | |
9880 | Call_expression::is_erroneous_call() | |
9881 | { | |
9882 | if (this->is_error_expression() || this->fn()->is_error_expression()) | |
9883 | return true; | |
9884 | ||
9885 | if (this->args() == NULL) | |
9886 | return false; | |
9887 | for (Expression_list::iterator pa = this->args()->begin(); | |
9888 | pa != this->args()->end(); | |
9889 | ++pa) | |
9890 | { | |
9891 | if ((*pa)->type()->is_error_type() || (*pa)->is_error_expression()) | |
9892 | return true; | |
9893 | } | |
9894 | return false; | |
9895 | } | |
9896 | ||
e440a328 | 9897 | // Get the type. |
9898 | ||
9899 | Type* | |
9900 | Call_expression::do_type() | |
9901 | { | |
9902 | if (this->type_ != NULL) | |
9903 | return this->type_; | |
9904 | ||
9905 | Type* ret; | |
9906 | Function_type* fntype = this->get_function_type(); | |
9907 | if (fntype == NULL) | |
9908 | return Type::make_error_type(); | |
9909 | ||
9910 | const Typed_identifier_list* results = fntype->results(); | |
9911 | if (results == NULL) | |
9912 | ret = Type::make_void_type(); | |
9913 | else if (results->size() == 1) | |
9914 | ret = results->begin()->type(); | |
9915 | else | |
9916 | ret = Type::make_call_multiple_result_type(this); | |
9917 | ||
9918 | this->type_ = ret; | |
9919 | ||
9920 | return this->type_; | |
9921 | } | |
9922 | ||
9923 | // Determine types for a call expression. We can use the function | |
9924 | // parameter types to set the types of the arguments. | |
9925 | ||
9926 | void | |
9927 | Call_expression::do_determine_type(const Type_context*) | |
9928 | { | |
fb94b0ca | 9929 | if (!this->determining_types()) |
9930 | return; | |
9931 | ||
e440a328 | 9932 | this->fn_->determine_type_no_context(); |
9933 | Function_type* fntype = this->get_function_type(); | |
9934 | const Typed_identifier_list* parameters = NULL; | |
9935 | if (fntype != NULL) | |
9936 | parameters = fntype->parameters(); | |
9937 | if (this->args_ != NULL) | |
9938 | { | |
9939 | Typed_identifier_list::const_iterator pt; | |
9940 | if (parameters != NULL) | |
9941 | pt = parameters->begin(); | |
09ea332d | 9942 | bool first = true; |
e440a328 | 9943 | for (Expression_list::const_iterator pa = this->args_->begin(); |
9944 | pa != this->args_->end(); | |
9945 | ++pa) | |
9946 | { | |
09ea332d | 9947 | if (first) |
9948 | { | |
9949 | first = false; | |
9950 | // If this is a method, the first argument is the | |
9951 | // receiver. | |
9952 | if (fntype != NULL && fntype->is_method()) | |
9953 | { | |
9954 | Type* rtype = fntype->receiver()->type(); | |
9955 | // The receiver is always passed as a pointer. | |
9956 | if (rtype->points_to() == NULL) | |
9957 | rtype = Type::make_pointer_type(rtype); | |
9958 | Type_context subcontext(rtype, false); | |
9959 | (*pa)->determine_type(&subcontext); | |
9960 | continue; | |
9961 | } | |
9962 | } | |
9963 | ||
e440a328 | 9964 | if (parameters != NULL && pt != parameters->end()) |
9965 | { | |
9966 | Type_context subcontext(pt->type(), false); | |
9967 | (*pa)->determine_type(&subcontext); | |
9968 | ++pt; | |
9969 | } | |
9970 | else | |
9971 | (*pa)->determine_type_no_context(); | |
9972 | } | |
9973 | } | |
9974 | } | |
9975 | ||
fb94b0ca | 9976 | // Called when determining types for a Call_expression. Return true |
9977 | // if we should go ahead, false if they have already been determined. | |
9978 | ||
9979 | bool | |
9980 | Call_expression::determining_types() | |
9981 | { | |
9982 | if (this->types_are_determined_) | |
9983 | return false; | |
9984 | else | |
9985 | { | |
9986 | this->types_are_determined_ = true; | |
9987 | return true; | |
9988 | } | |
9989 | } | |
9990 | ||
e440a328 | 9991 | // Check types for parameter I. |
9992 | ||
9993 | bool | |
9994 | Call_expression::check_argument_type(int i, const Type* parameter_type, | |
9995 | const Type* argument_type, | |
b13c66cd | 9996 | Location argument_location, |
e440a328 | 9997 | bool issued_error) |
9998 | { | |
9999 | std::string reason; | |
1eae365b | 10000 | if (!Type::are_assignable(parameter_type, argument_type, &reason)) |
e440a328 | 10001 | { |
10002 | if (!issued_error) | |
10003 | { | |
10004 | if (reason.empty()) | |
631d5788 | 10005 | go_error_at(argument_location, "argument %d has incompatible type", i); |
e440a328 | 10006 | else |
631d5788 | 10007 | go_error_at(argument_location, |
10008 | "argument %d has incompatible type (%s)", | |
10009 | i, reason.c_str()); | |
e440a328 | 10010 | } |
10011 | this->set_is_error(); | |
10012 | return false; | |
10013 | } | |
10014 | return true; | |
10015 | } | |
10016 | ||
10017 | // Check types. | |
10018 | ||
10019 | void | |
10020 | Call_expression::do_check_types(Gogo*) | |
10021 | { | |
a6645f74 | 10022 | if (this->classification() == EXPRESSION_ERROR) |
10023 | return; | |
10024 | ||
e440a328 | 10025 | Function_type* fntype = this->get_function_type(); |
10026 | if (fntype == NULL) | |
10027 | { | |
5c13bd80 | 10028 | if (!this->fn_->type()->is_error()) |
e440a328 | 10029 | this->report_error(_("expected function")); |
10030 | return; | |
10031 | } | |
10032 | ||
1373401e | 10033 | if (this->expected_result_count_ != 0 |
10034 | && this->expected_result_count_ != this->result_count()) | |
10035 | { | |
10036 | if (this->issue_error()) | |
10037 | this->report_error(_("function result count mismatch")); | |
10038 | this->set_is_error(); | |
10039 | return; | |
10040 | } | |
10041 | ||
09ea332d | 10042 | bool is_method = fntype->is_method(); |
10043 | if (is_method) | |
e440a328 | 10044 | { |
09ea332d | 10045 | go_assert(this->args_ != NULL && !this->args_->empty()); |
10046 | Type* rtype = fntype->receiver()->type(); | |
10047 | Expression* first_arg = this->args_->front(); | |
1eae365b | 10048 | // We dereference the values since receivers are always passed |
10049 | // as pointers. | |
09ea332d | 10050 | std::string reason; |
1eae365b | 10051 | if (!Type::are_assignable(rtype->deref(), first_arg->type()->deref(), |
10052 | &reason)) | |
e440a328 | 10053 | { |
09ea332d | 10054 | if (reason.empty()) |
10055 | this->report_error(_("incompatible type for receiver")); | |
10056 | else | |
e440a328 | 10057 | { |
631d5788 | 10058 | go_error_at(this->location(), |
10059 | "incompatible type for receiver (%s)", | |
10060 | reason.c_str()); | |
09ea332d | 10061 | this->set_is_error(); |
e440a328 | 10062 | } |
10063 | } | |
10064 | } | |
10065 | ||
10066 | // Note that varargs was handled by the lower_varargs() method, so | |
a6645f74 | 10067 | // we don't have to worry about it here unless something is wrong. |
10068 | if (this->is_varargs_ && !this->varargs_are_lowered_) | |
10069 | { | |
10070 | if (!fntype->is_varargs()) | |
10071 | { | |
631d5788 | 10072 | go_error_at(this->location(), |
10073 | _("invalid use of %<...%> calling non-variadic function")); | |
a6645f74 | 10074 | this->set_is_error(); |
10075 | return; | |
10076 | } | |
10077 | } | |
e440a328 | 10078 | |
10079 | const Typed_identifier_list* parameters = fntype->parameters(); | |
10080 | if (this->args_ == NULL) | |
10081 | { | |
10082 | if (parameters != NULL && !parameters->empty()) | |
10083 | this->report_error(_("not enough arguments")); | |
10084 | } | |
10085 | else if (parameters == NULL) | |
09ea332d | 10086 | { |
10087 | if (!is_method || this->args_->size() > 1) | |
10088 | this->report_error(_("too many arguments")); | |
10089 | } | |
1373401e | 10090 | else if (this->args_->size() == 1 |
10091 | && this->args_->front()->call_expression() != NULL | |
10092 | && this->args_->front()->call_expression()->result_count() > 1) | |
10093 | { | |
10094 | // This is F(G()) when G returns more than one result. If the | |
10095 | // results can be matched to parameters, it would have been | |
10096 | // lowered in do_lower. If we get here we know there is a | |
10097 | // mismatch. | |
10098 | if (this->args_->front()->call_expression()->result_count() | |
10099 | < parameters->size()) | |
10100 | this->report_error(_("not enough arguments")); | |
10101 | else | |
10102 | this->report_error(_("too many arguments")); | |
10103 | } | |
e440a328 | 10104 | else |
10105 | { | |
10106 | int i = 0; | |
09ea332d | 10107 | Expression_list::const_iterator pa = this->args_->begin(); |
10108 | if (is_method) | |
10109 | ++pa; | |
10110 | for (Typed_identifier_list::const_iterator pt = parameters->begin(); | |
10111 | pt != parameters->end(); | |
10112 | ++pt, ++pa, ++i) | |
e440a328 | 10113 | { |
09ea332d | 10114 | if (pa == this->args_->end()) |
e440a328 | 10115 | { |
09ea332d | 10116 | this->report_error(_("not enough arguments")); |
e440a328 | 10117 | return; |
10118 | } | |
10119 | this->check_argument_type(i + 1, pt->type(), (*pa)->type(), | |
10120 | (*pa)->location(), false); | |
10121 | } | |
09ea332d | 10122 | if (pa != this->args_->end()) |
10123 | this->report_error(_("too many arguments")); | |
e440a328 | 10124 | } |
10125 | } | |
10126 | ||
72666aed | 10127 | Expression* |
10128 | Call_expression::do_copy() | |
10129 | { | |
10130 | Call_expression* call = | |
10131 | Expression::make_call(this->fn_->copy(), | |
10132 | (this->args_ == NULL | |
10133 | ? NULL | |
10134 | : this->args_->copy()), | |
10135 | this->is_varargs_, this->location()); | |
10136 | ||
10137 | if (this->varargs_are_lowered_) | |
10138 | call->set_varargs_are_lowered(); | |
10139 | return call; | |
10140 | } | |
10141 | ||
e440a328 | 10142 | // Return whether we have to use a temporary variable to ensure that |
10143 | // we evaluate this call expression in order. If the call returns no | |
ceeb4318 | 10144 | // results then it will inevitably be executed last. |
e440a328 | 10145 | |
10146 | bool | |
10147 | Call_expression::do_must_eval_in_order() const | |
10148 | { | |
ceeb4318 | 10149 | return this->result_count() > 0; |
e440a328 | 10150 | } |
10151 | ||
e440a328 | 10152 | // Get the function and the first argument to use when calling an |
10153 | // interface method. | |
10154 | ||
2387f644 | 10155 | Expression* |
e440a328 | 10156 | Call_expression::interface_method_function( |
e440a328 | 10157 | Interface_field_reference_expression* interface_method, |
2387f644 | 10158 | Expression** first_arg_ptr) |
e440a328 | 10159 | { |
2387f644 | 10160 | *first_arg_ptr = interface_method->get_underlying_object(); |
10161 | return interface_method->get_function(); | |
e440a328 | 10162 | } |
10163 | ||
10164 | // Build the call expression. | |
10165 | ||
ea664253 | 10166 | Bexpression* |
10167 | Call_expression::do_get_backend(Translate_context* context) | |
e440a328 | 10168 | { |
2c809f8f | 10169 | if (this->call_ != NULL) |
ea664253 | 10170 | return this->call_; |
e440a328 | 10171 | |
10172 | Function_type* fntype = this->get_function_type(); | |
10173 | if (fntype == NULL) | |
ea664253 | 10174 | return context->backend()->error_expression(); |
e440a328 | 10175 | |
10176 | if (this->fn_->is_error_expression()) | |
ea664253 | 10177 | return context->backend()->error_expression(); |
e440a328 | 10178 | |
10179 | Gogo* gogo = context->gogo(); | |
b13c66cd | 10180 | Location location = this->location(); |
e440a328 | 10181 | |
10182 | Func_expression* func = this->fn_->func_expression(); | |
e440a328 | 10183 | Interface_field_reference_expression* interface_method = |
10184 | this->fn_->interface_field_reference_expression(); | |
10185 | const bool has_closure = func != NULL && func->closure() != NULL; | |
09ea332d | 10186 | const bool is_interface_method = interface_method != NULL; |
e440a328 | 10187 | |
f8bdf81a | 10188 | bool has_closure_arg; |
8381eda7 | 10189 | if (has_closure) |
f8bdf81a | 10190 | has_closure_arg = true; |
8381eda7 | 10191 | else if (func != NULL) |
f8bdf81a | 10192 | has_closure_arg = false; |
8381eda7 | 10193 | else if (is_interface_method) |
f8bdf81a | 10194 | has_closure_arg = false; |
8381eda7 | 10195 | else |
f8bdf81a | 10196 | has_closure_arg = true; |
8381eda7 | 10197 | |
e440a328 | 10198 | int nargs; |
2c809f8f | 10199 | std::vector<Bexpression*> fn_args; |
e440a328 | 10200 | if (this->args_ == NULL || this->args_->empty()) |
10201 | { | |
f8bdf81a | 10202 | nargs = is_interface_method ? 1 : 0; |
2c809f8f | 10203 | if (nargs > 0) |
10204 | fn_args.resize(1); | |
e440a328 | 10205 | } |
09ea332d | 10206 | else if (fntype->parameters() == NULL || fntype->parameters()->empty()) |
10207 | { | |
10208 | // Passing a receiver parameter. | |
10209 | go_assert(!is_interface_method | |
10210 | && fntype->is_method() | |
10211 | && this->args_->size() == 1); | |
f8bdf81a | 10212 | nargs = 1; |
2c809f8f | 10213 | fn_args.resize(1); |
ea664253 | 10214 | fn_args[0] = this->args_->front()->get_backend(context); |
09ea332d | 10215 | } |
e440a328 | 10216 | else |
10217 | { | |
10218 | const Typed_identifier_list* params = fntype->parameters(); | |
e440a328 | 10219 | |
10220 | nargs = this->args_->size(); | |
09ea332d | 10221 | int i = is_interface_method ? 1 : 0; |
e440a328 | 10222 | nargs += i; |
2c809f8f | 10223 | fn_args.resize(nargs); |
e440a328 | 10224 | |
10225 | Typed_identifier_list::const_iterator pp = params->begin(); | |
09ea332d | 10226 | Expression_list::const_iterator pe = this->args_->begin(); |
10227 | if (!is_interface_method && fntype->is_method()) | |
10228 | { | |
ea664253 | 10229 | fn_args[i] = (*pe)->get_backend(context); |
09ea332d | 10230 | ++pe; |
10231 | ++i; | |
10232 | } | |
10233 | for (; pe != this->args_->end(); ++pe, ++pp, ++i) | |
e440a328 | 10234 | { |
c484d925 | 10235 | go_assert(pp != params->end()); |
2c809f8f | 10236 | Expression* arg = |
10237 | Expression::convert_for_assignment(gogo, pp->type(), *pe, | |
10238 | location); | |
ea664253 | 10239 | fn_args[i] = arg->get_backend(context); |
e440a328 | 10240 | } |
c484d925 | 10241 | go_assert(pp == params->end()); |
f8bdf81a | 10242 | go_assert(i == nargs); |
e440a328 | 10243 | } |
10244 | ||
2c809f8f | 10245 | Expression* fn; |
10246 | Expression* closure = NULL; | |
8381eda7 | 10247 | if (func != NULL) |
10248 | { | |
10249 | Named_object* no = func->named_object(); | |
2c809f8f | 10250 | fn = Expression::make_func_code_reference(no, location); |
10251 | if (has_closure) | |
10252 | closure = func->closure(); | |
8381eda7 | 10253 | } |
09ea332d | 10254 | else if (!is_interface_method) |
8381eda7 | 10255 | { |
2c809f8f | 10256 | closure = this->fn_; |
10257 | ||
10258 | // The backend representation of this function type is a pointer | |
10259 | // to a struct whose first field is the actual function to call. | |
10260 | Type* pfntype = | |
10261 | Type::make_pointer_type( | |
10262 | Type::make_pointer_type(Type::make_void_type())); | |
10263 | fn = Expression::make_unsafe_cast(pfntype, this->fn_, location); | |
10264 | fn = Expression::make_unary(OPERATOR_MULT, fn, location); | |
10265 | } | |
e440a328 | 10266 | else |
cf609de4 | 10267 | { |
2387f644 | 10268 | Expression* first_arg; |
2c809f8f | 10269 | fn = this->interface_method_function(interface_method, &first_arg); |
ea664253 | 10270 | fn_args[0] = first_arg->get_backend(context); |
e440a328 | 10271 | } |
10272 | ||
1ecc6157 | 10273 | Bexpression* bclosure = NULL; |
10274 | if (has_closure_arg) | |
10275 | bclosure = closure->get_backend(context); | |
f8bdf81a | 10276 | else |
1ecc6157 | 10277 | go_assert(closure == NULL); |
f8bdf81a | 10278 | |
ea664253 | 10279 | Bexpression* bfn = fn->get_backend(context); |
80d1e1a8 | 10280 | |
10281 | // When not calling a named function directly, use a type conversion | |
10282 | // in case the type of the function is a recursive type which refers | |
10283 | // to itself. We don't do this for an interface method because 1) | |
10284 | // an interface method never refers to itself, so we always have a | |
10285 | // function type here; 2) we pass an extra first argument to an | |
10286 | // interface method, so fntype is not correct. | |
10287 | if (func == NULL && !is_interface_method) | |
10288 | { | |
10289 | Btype* bft = fntype->get_backend_fntype(gogo); | |
10290 | bfn = gogo->backend()->convert_expression(bft, bfn, location); | |
10291 | } | |
10292 | ||
1ecc6157 | 10293 | Bexpression* call = gogo->backend()->call_expression(bfn, fn_args, |
10294 | bclosure, location); | |
e440a328 | 10295 | |
2c809f8f | 10296 | if (this->results_ != NULL) |
e440a328 | 10297 | { |
03118c21 | 10298 | Bexpression* bcall_ref = this->call_result_ref(context); |
0ab48656 | 10299 | Bfunction* bfunction = context->function()->func_value()->get_decl(); |
2c809f8f | 10300 | Bstatement* assn_stmt = |
0ab48656 | 10301 | gogo->backend()->assignment_statement(bfunction, |
10302 | bcall_ref, call, location); | |
e440a328 | 10303 | |
03118c21 | 10304 | this->call_ = this->set_results(context); |
e440a328 | 10305 | |
2c809f8f | 10306 | Bexpression* set_and_call = |
10307 | gogo->backend()->compound_expression(assn_stmt, this->call_, | |
10308 | location); | |
ea664253 | 10309 | return set_and_call; |
2c809f8f | 10310 | } |
e440a328 | 10311 | |
2c809f8f | 10312 | this->call_ = call; |
ea664253 | 10313 | return this->call_; |
e440a328 | 10314 | } |
10315 | ||
03118c21 | 10316 | // Return the backend representation of a reference to the struct used |
10317 | // to capture the result of a multiple-output call. | |
10318 | ||
10319 | Bexpression* | |
10320 | Call_expression::call_result_ref(Translate_context* context) | |
10321 | { | |
10322 | go_assert(this->call_temp_ != NULL); | |
10323 | Location location = this->location(); | |
10324 | Expression* call_ref = | |
10325 | Expression::make_temporary_reference(this->call_temp_, location); | |
10326 | Bexpression* bcall_ref = call_ref->get_backend(context); | |
10327 | return bcall_ref; | |
10328 | } | |
10329 | ||
ceeb4318 | 10330 | // Set the result variables if this call returns multiple results. |
10331 | ||
2c809f8f | 10332 | Bexpression* |
03118c21 | 10333 | Call_expression::set_results(Translate_context* context) |
ceeb4318 | 10334 | { |
2c809f8f | 10335 | Gogo* gogo = context->gogo(); |
ceeb4318 | 10336 | |
2c809f8f | 10337 | Bexpression* results = NULL; |
b13c66cd | 10338 | Location loc = this->location(); |
2c809f8f | 10339 | |
03118c21 | 10340 | go_assert(this->call_temp_ != NULL); |
10341 | ||
ceeb4318 | 10342 | size_t rc = this->result_count(); |
2c809f8f | 10343 | for (size_t i = 0; i < rc; ++i) |
ceeb4318 | 10344 | { |
ceeb4318 | 10345 | Temporary_statement* temp = this->result(i); |
cd238b8d | 10346 | if (temp == NULL) |
10347 | { | |
10348 | go_assert(saw_errors()); | |
2c809f8f | 10349 | return gogo->backend()->error_expression(); |
cd238b8d | 10350 | } |
ceeb4318 | 10351 | Temporary_reference_expression* ref = |
10352 | Expression::make_temporary_reference(temp, loc); | |
10353 | ref->set_is_lvalue(); | |
ceeb4318 | 10354 | |
0ab48656 | 10355 | Bfunction* bfunction = context->function()->func_value()->get_decl(); |
ea664253 | 10356 | Bexpression* result_ref = ref->get_backend(context); |
03118c21 | 10357 | Bexpression* bcall_ref = this->call_result_ref(context); |
2c809f8f | 10358 | Bexpression* call_result = |
03118c21 | 10359 | gogo->backend()->struct_field_expression(bcall_ref, i, loc); |
2c809f8f | 10360 | Bstatement* assn_stmt = |
0ab48656 | 10361 | gogo->backend()->assignment_statement(bfunction, |
10362 | result_ref, call_result, loc); | |
ceeb4318 | 10363 | |
03118c21 | 10364 | bcall_ref = this->call_result_ref(context); |
10365 | call_result = gogo->backend()->struct_field_expression(bcall_ref, i, loc); | |
2c809f8f | 10366 | Bexpression* result = |
10367 | gogo->backend()->compound_expression(assn_stmt, call_result, loc); | |
ceeb4318 | 10368 | |
2c809f8f | 10369 | if (results == NULL) |
10370 | results = result; | |
10371 | else | |
10372 | { | |
0ab48656 | 10373 | Bstatement* expr_stmt = |
10374 | gogo->backend()->expression_statement(bfunction, result); | |
2c809f8f | 10375 | results = |
10376 | gogo->backend()->compound_expression(expr_stmt, results, loc); | |
10377 | } | |
10378 | } | |
10379 | return results; | |
ceeb4318 | 10380 | } |
10381 | ||
d751bb78 | 10382 | // Dump ast representation for a call expressin. |
10383 | ||
10384 | void | |
10385 | Call_expression::do_dump_expression(Ast_dump_context* ast_dump_context) const | |
10386 | { | |
10387 | this->fn_->dump_expression(ast_dump_context); | |
10388 | ast_dump_context->ostream() << "("; | |
10389 | if (args_ != NULL) | |
10390 | ast_dump_context->dump_expression_list(this->args_); | |
10391 | ||
10392 | ast_dump_context->ostream() << ") "; | |
10393 | } | |
10394 | ||
e440a328 | 10395 | // Make a call expression. |
10396 | ||
10397 | Call_expression* | |
10398 | Expression::make_call(Expression* fn, Expression_list* args, bool is_varargs, | |
b13c66cd | 10399 | Location location) |
e440a328 | 10400 | { |
10401 | return new Call_expression(fn, args, is_varargs, location); | |
10402 | } | |
10403 | ||
da244e59 | 10404 | // Class Call_result_expression. |
e440a328 | 10405 | |
10406 | // Traverse a call result. | |
10407 | ||
10408 | int | |
10409 | Call_result_expression::do_traverse(Traverse* traverse) | |
10410 | { | |
10411 | if (traverse->remember_expression(this->call_)) | |
10412 | { | |
10413 | // We have already traversed the call expression. | |
10414 | return TRAVERSE_CONTINUE; | |
10415 | } | |
10416 | return Expression::traverse(&this->call_, traverse); | |
10417 | } | |
10418 | ||
10419 | // Get the type. | |
10420 | ||
10421 | Type* | |
10422 | Call_result_expression::do_type() | |
10423 | { | |
425dd051 | 10424 | if (this->classification() == EXPRESSION_ERROR) |
10425 | return Type::make_error_type(); | |
10426 | ||
e440a328 | 10427 | // THIS->CALL_ can be replaced with a temporary reference due to |
10428 | // Call_expression::do_must_eval_in_order when there is an error. | |
10429 | Call_expression* ce = this->call_->call_expression(); | |
10430 | if (ce == NULL) | |
5e85f268 | 10431 | { |
10432 | this->set_is_error(); | |
10433 | return Type::make_error_type(); | |
10434 | } | |
e440a328 | 10435 | Function_type* fntype = ce->get_function_type(); |
10436 | if (fntype == NULL) | |
5e85f268 | 10437 | { |
e37658e2 | 10438 | if (ce->issue_error()) |
99b3f06f | 10439 | { |
10440 | if (!ce->fn()->type()->is_error()) | |
10441 | this->report_error(_("expected function")); | |
10442 | } | |
5e85f268 | 10443 | this->set_is_error(); |
10444 | return Type::make_error_type(); | |
10445 | } | |
e440a328 | 10446 | const Typed_identifier_list* results = fntype->results(); |
ceeb4318 | 10447 | if (results == NULL || results->size() < 2) |
7b8d861f | 10448 | { |
ceeb4318 | 10449 | if (ce->issue_error()) |
10450 | this->report_error(_("number of results does not match " | |
10451 | "number of values")); | |
7b8d861f | 10452 | return Type::make_error_type(); |
10453 | } | |
e440a328 | 10454 | Typed_identifier_list::const_iterator pr = results->begin(); |
10455 | for (unsigned int i = 0; i < this->index_; ++i) | |
10456 | { | |
10457 | if (pr == results->end()) | |
425dd051 | 10458 | break; |
e440a328 | 10459 | ++pr; |
10460 | } | |
10461 | if (pr == results->end()) | |
425dd051 | 10462 | { |
ceeb4318 | 10463 | if (ce->issue_error()) |
10464 | this->report_error(_("number of results does not match " | |
10465 | "number of values")); | |
425dd051 | 10466 | return Type::make_error_type(); |
10467 | } | |
e440a328 | 10468 | return pr->type(); |
10469 | } | |
10470 | ||
425dd051 | 10471 | // Check the type. Just make sure that we trigger the warning in |
10472 | // do_type. | |
e440a328 | 10473 | |
10474 | void | |
10475 | Call_result_expression::do_check_types(Gogo*) | |
10476 | { | |
425dd051 | 10477 | this->type(); |
e440a328 | 10478 | } |
10479 | ||
10480 | // Determine the type. We have nothing to do here, but the 0 result | |
10481 | // needs to pass down to the caller. | |
10482 | ||
10483 | void | |
10484 | Call_result_expression::do_determine_type(const Type_context*) | |
10485 | { | |
fb94b0ca | 10486 | this->call_->determine_type_no_context(); |
e440a328 | 10487 | } |
10488 | ||
ea664253 | 10489 | // Return the backend representation. We just refer to the temporary set by the |
10490 | // call expression. We don't do this at lowering time because it makes it | |
ceeb4318 | 10491 | // hard to evaluate the call at the right time. |
e440a328 | 10492 | |
ea664253 | 10493 | Bexpression* |
10494 | Call_result_expression::do_get_backend(Translate_context* context) | |
e440a328 | 10495 | { |
ceeb4318 | 10496 | Call_expression* ce = this->call_->call_expression(); |
cd238b8d | 10497 | if (ce == NULL) |
10498 | { | |
10499 | go_assert(this->call_->is_error_expression()); | |
ea664253 | 10500 | return context->backend()->error_expression(); |
cd238b8d | 10501 | } |
ceeb4318 | 10502 | Temporary_statement* ts = ce->result(this->index_); |
cd238b8d | 10503 | if (ts == NULL) |
10504 | { | |
10505 | go_assert(saw_errors()); | |
ea664253 | 10506 | return context->backend()->error_expression(); |
cd238b8d | 10507 | } |
ceeb4318 | 10508 | Expression* ref = Expression::make_temporary_reference(ts, this->location()); |
ea664253 | 10509 | return ref->get_backend(context); |
e440a328 | 10510 | } |
10511 | ||
d751bb78 | 10512 | // Dump ast representation for a call result expression. |
10513 | ||
10514 | void | |
10515 | Call_result_expression::do_dump_expression(Ast_dump_context* ast_dump_context) | |
10516 | const | |
10517 | { | |
10518 | // FIXME: Wouldn't it be better if the call is assigned to a temporary | |
10519 | // (struct) and the fields are referenced instead. | |
10520 | ast_dump_context->ostream() << this->index_ << "@("; | |
10521 | ast_dump_context->dump_expression(this->call_); | |
10522 | ast_dump_context->ostream() << ")"; | |
10523 | } | |
10524 | ||
e440a328 | 10525 | // Make a reference to a single result of a call which returns |
10526 | // multiple results. | |
10527 | ||
10528 | Expression* | |
10529 | Expression::make_call_result(Call_expression* call, unsigned int index) | |
10530 | { | |
10531 | return new Call_result_expression(call, index); | |
10532 | } | |
10533 | ||
10534 | // Class Index_expression. | |
10535 | ||
10536 | // Traversal. | |
10537 | ||
10538 | int | |
10539 | Index_expression::do_traverse(Traverse* traverse) | |
10540 | { | |
10541 | if (Expression::traverse(&this->left_, traverse) == TRAVERSE_EXIT | |
10542 | || Expression::traverse(&this->start_, traverse) == TRAVERSE_EXIT | |
10543 | || (this->end_ != NULL | |
acf2b673 | 10544 | && Expression::traverse(&this->end_, traverse) == TRAVERSE_EXIT) |
10545 | || (this->cap_ != NULL | |
10546 | && Expression::traverse(&this->cap_, traverse) == TRAVERSE_EXIT)) | |
e440a328 | 10547 | return TRAVERSE_EXIT; |
10548 | return TRAVERSE_CONTINUE; | |
10549 | } | |
10550 | ||
10551 | // Lower an index expression. This converts the generic index | |
10552 | // expression into an array index, a string index, or a map index. | |
10553 | ||
10554 | Expression* | |
ceeb4318 | 10555 | Index_expression::do_lower(Gogo*, Named_object*, Statement_inserter*, int) |
e440a328 | 10556 | { |
b13c66cd | 10557 | Location location = this->location(); |
e440a328 | 10558 | Expression* left = this->left_; |
10559 | Expression* start = this->start_; | |
10560 | Expression* end = this->end_; | |
acf2b673 | 10561 | Expression* cap = this->cap_; |
e440a328 | 10562 | |
10563 | Type* type = left->type(); | |
5c13bd80 | 10564 | if (type->is_error()) |
d9f3743a | 10565 | { |
10566 | go_assert(saw_errors()); | |
10567 | return Expression::make_error(location); | |
10568 | } | |
b0cf7ddd | 10569 | else if (left->is_type_expression()) |
10570 | { | |
631d5788 | 10571 | go_error_at(location, "attempt to index type expression"); |
b0cf7ddd | 10572 | return Expression::make_error(location); |
10573 | } | |
e440a328 | 10574 | else if (type->array_type() != NULL) |
acf2b673 | 10575 | return Expression::make_array_index(left, start, end, cap, location); |
e440a328 | 10576 | else if (type->points_to() != NULL |
10577 | && type->points_to()->array_type() != NULL | |
411eb89e | 10578 | && !type->points_to()->is_slice_type()) |
e440a328 | 10579 | { |
10580 | Expression* deref = Expression::make_unary(OPERATOR_MULT, left, | |
10581 | location); | |
38092374 | 10582 | |
10583 | // For an ordinary index into the array, the pointer will be | |
10584 | // dereferenced. For a slice it will not--the resulting slice | |
10585 | // will simply reuse the pointer, which is incorrect if that | |
10586 | // pointer is nil. | |
10587 | if (end != NULL || cap != NULL) | |
10588 | deref->issue_nil_check(); | |
10589 | ||
acf2b673 | 10590 | return Expression::make_array_index(deref, start, end, cap, location); |
e440a328 | 10591 | } |
10592 | else if (type->is_string_type()) | |
acf2b673 | 10593 | { |
10594 | if (cap != NULL) | |
10595 | { | |
631d5788 | 10596 | go_error_at(location, "invalid 3-index slice of string"); |
acf2b673 | 10597 | return Expression::make_error(location); |
10598 | } | |
10599 | return Expression::make_string_index(left, start, end, location); | |
10600 | } | |
e440a328 | 10601 | else if (type->map_type() != NULL) |
10602 | { | |
acf2b673 | 10603 | if (end != NULL || cap != NULL) |
e440a328 | 10604 | { |
631d5788 | 10605 | go_error_at(location, "invalid slice of map"); |
e440a328 | 10606 | return Expression::make_error(location); |
10607 | } | |
0d5530d9 | 10608 | return Expression::make_map_index(left, start, location); |
e440a328 | 10609 | } |
10610 | else | |
10611 | { | |
631d5788 | 10612 | go_error_at(location, |
10613 | "attempt to index object which is not array, string, or map"); | |
e440a328 | 10614 | return Expression::make_error(location); |
10615 | } | |
10616 | } | |
10617 | ||
acf2b673 | 10618 | // Write an indexed expression |
10619 | // (expr[expr:expr:expr], expr[expr:expr] or expr[expr]) to a dump context. | |
d751bb78 | 10620 | |
10621 | void | |
10622 | Index_expression::dump_index_expression(Ast_dump_context* ast_dump_context, | |
10623 | const Expression* expr, | |
10624 | const Expression* start, | |
acf2b673 | 10625 | const Expression* end, |
10626 | const Expression* cap) | |
d751bb78 | 10627 | { |
10628 | expr->dump_expression(ast_dump_context); | |
10629 | ast_dump_context->ostream() << "["; | |
10630 | start->dump_expression(ast_dump_context); | |
10631 | if (end != NULL) | |
10632 | { | |
10633 | ast_dump_context->ostream() << ":"; | |
10634 | end->dump_expression(ast_dump_context); | |
10635 | } | |
acf2b673 | 10636 | if (cap != NULL) |
10637 | { | |
10638 | ast_dump_context->ostream() << ":"; | |
10639 | cap->dump_expression(ast_dump_context); | |
10640 | } | |
d751bb78 | 10641 | ast_dump_context->ostream() << "]"; |
10642 | } | |
10643 | ||
10644 | // Dump ast representation for an index expression. | |
10645 | ||
10646 | void | |
10647 | Index_expression::do_dump_expression(Ast_dump_context* ast_dump_context) | |
10648 | const | |
10649 | { | |
10650 | Index_expression::dump_index_expression(ast_dump_context, this->left_, | |
acf2b673 | 10651 | this->start_, this->end_, this->cap_); |
d751bb78 | 10652 | } |
10653 | ||
e440a328 | 10654 | // Make an index expression. |
10655 | ||
10656 | Expression* | |
10657 | Expression::make_index(Expression* left, Expression* start, Expression* end, | |
acf2b673 | 10658 | Expression* cap, Location location) |
e440a328 | 10659 | { |
acf2b673 | 10660 | return new Index_expression(left, start, end, cap, location); |
e440a328 | 10661 | } |
10662 | ||
da244e59 | 10663 | // Class Array_index_expression. |
e440a328 | 10664 | |
10665 | // Array index traversal. | |
10666 | ||
10667 | int | |
10668 | Array_index_expression::do_traverse(Traverse* traverse) | |
10669 | { | |
10670 | if (Expression::traverse(&this->array_, traverse) == TRAVERSE_EXIT) | |
10671 | return TRAVERSE_EXIT; | |
10672 | if (Expression::traverse(&this->start_, traverse) == TRAVERSE_EXIT) | |
10673 | return TRAVERSE_EXIT; | |
10674 | if (this->end_ != NULL) | |
10675 | { | |
10676 | if (Expression::traverse(&this->end_, traverse) == TRAVERSE_EXIT) | |
10677 | return TRAVERSE_EXIT; | |
10678 | } | |
acf2b673 | 10679 | if (this->cap_ != NULL) |
10680 | { | |
10681 | if (Expression::traverse(&this->cap_, traverse) == TRAVERSE_EXIT) | |
10682 | return TRAVERSE_EXIT; | |
10683 | } | |
e440a328 | 10684 | return TRAVERSE_CONTINUE; |
10685 | } | |
10686 | ||
10687 | // Return the type of an array index. | |
10688 | ||
10689 | Type* | |
10690 | Array_index_expression::do_type() | |
10691 | { | |
10692 | if (this->type_ == NULL) | |
10693 | { | |
10694 | Array_type* type = this->array_->type()->array_type(); | |
10695 | if (type == NULL) | |
10696 | this->type_ = Type::make_error_type(); | |
10697 | else if (this->end_ == NULL) | |
10698 | this->type_ = type->element_type(); | |
411eb89e | 10699 | else if (type->is_slice_type()) |
e440a328 | 10700 | { |
10701 | // A slice of a slice has the same type as the original | |
10702 | // slice. | |
10703 | this->type_ = this->array_->type()->deref(); | |
10704 | } | |
10705 | else | |
10706 | { | |
10707 | // A slice of an array is a slice. | |
10708 | this->type_ = Type::make_array_type(type->element_type(), NULL); | |
10709 | } | |
10710 | } | |
10711 | return this->type_; | |
10712 | } | |
10713 | ||
10714 | // Set the type of an array index. | |
10715 | ||
10716 | void | |
10717 | Array_index_expression::do_determine_type(const Type_context*) | |
10718 | { | |
10719 | this->array_->determine_type_no_context(); | |
f77aa642 | 10720 | |
10721 | Type_context index_context(Type::lookup_integer_type("int"), false); | |
10722 | if (this->start_->is_constant()) | |
10723 | this->start_->determine_type(&index_context); | |
10724 | else | |
10725 | this->start_->determine_type_no_context(); | |
e440a328 | 10726 | if (this->end_ != NULL) |
f77aa642 | 10727 | { |
10728 | if (this->end_->is_constant()) | |
10729 | this->end_->determine_type(&index_context); | |
10730 | else | |
10731 | this->end_->determine_type_no_context(); | |
10732 | } | |
acf2b673 | 10733 | if (this->cap_ != NULL) |
f77aa642 | 10734 | { |
10735 | if (this->cap_->is_constant()) | |
10736 | this->cap_->determine_type(&index_context); | |
10737 | else | |
10738 | this->cap_->determine_type_no_context(); | |
10739 | } | |
e440a328 | 10740 | } |
10741 | ||
10742 | // Check types of an array index. | |
10743 | ||
10744 | void | |
d0a50ed8 | 10745 | Array_index_expression::do_check_types(Gogo* gogo) |
e440a328 | 10746 | { |
f6bc81e6 | 10747 | Numeric_constant nc; |
10748 | unsigned long v; | |
10749 | if (this->start_->type()->integer_type() == NULL | |
10750 | && !this->start_->type()->is_error() | |
10751 | && (!this->start_->numeric_constant_value(&nc) | |
10752 | || nc.to_unsigned_long(&v) == Numeric_constant::NC_UL_NOTINT)) | |
e440a328 | 10753 | this->report_error(_("index must be integer")); |
10754 | if (this->end_ != NULL | |
10755 | && this->end_->type()->integer_type() == NULL | |
99b3f06f | 10756 | && !this->end_->type()->is_error() |
10757 | && !this->end_->is_nil_expression() | |
f6bc81e6 | 10758 | && !this->end_->is_error_expression() |
10759 | && (!this->end_->numeric_constant_value(&nc) | |
10760 | || nc.to_unsigned_long(&v) == Numeric_constant::NC_UL_NOTINT)) | |
e440a328 | 10761 | this->report_error(_("slice end must be integer")); |
acf2b673 | 10762 | if (this->cap_ != NULL |
10763 | && this->cap_->type()->integer_type() == NULL | |
10764 | && !this->cap_->type()->is_error() | |
10765 | && !this->cap_->is_nil_expression() | |
10766 | && !this->cap_->is_error_expression() | |
10767 | && (!this->cap_->numeric_constant_value(&nc) | |
10768 | || nc.to_unsigned_long(&v) == Numeric_constant::NC_UL_NOTINT)) | |
10769 | this->report_error(_("slice capacity must be integer")); | |
e440a328 | 10770 | |
10771 | Array_type* array_type = this->array_->type()->array_type(); | |
f9c68f17 | 10772 | if (array_type == NULL) |
10773 | { | |
c484d925 | 10774 | go_assert(this->array_->type()->is_error()); |
f9c68f17 | 10775 | return; |
10776 | } | |
e440a328 | 10777 | |
10778 | unsigned int int_bits = | |
10779 | Type::lookup_integer_type("int")->integer_type()->bits(); | |
10780 | ||
0c77715b | 10781 | Numeric_constant lvalnc; |
e440a328 | 10782 | mpz_t lval; |
e440a328 | 10783 | bool lval_valid = (array_type->length() != NULL |
0c77715b | 10784 | && array_type->length()->numeric_constant_value(&lvalnc) |
10785 | && lvalnc.to_int(&lval)); | |
10786 | Numeric_constant inc; | |
e440a328 | 10787 | mpz_t ival; |
0bd5d859 | 10788 | bool ival_valid = false; |
0c77715b | 10789 | if (this->start_->numeric_constant_value(&inc) && inc.to_int(&ival)) |
e440a328 | 10790 | { |
0bd5d859 | 10791 | ival_valid = true; |
e440a328 | 10792 | if (mpz_sgn(ival) < 0 |
10793 | || mpz_sizeinbase(ival, 2) >= int_bits | |
10794 | || (lval_valid | |
10795 | && (this->end_ == NULL | |
10796 | ? mpz_cmp(ival, lval) >= 0 | |
10797 | : mpz_cmp(ival, lval) > 0))) | |
10798 | { | |
631d5788 | 10799 | go_error_at(this->start_->location(), "array index out of bounds"); |
e440a328 | 10800 | this->set_is_error(); |
10801 | } | |
10802 | } | |
10803 | if (this->end_ != NULL && !this->end_->is_nil_expression()) | |
10804 | { | |
0c77715b | 10805 | Numeric_constant enc; |
10806 | mpz_t eval; | |
acf2b673 | 10807 | bool eval_valid = false; |
0c77715b | 10808 | if (this->end_->numeric_constant_value(&enc) && enc.to_int(&eval)) |
e440a328 | 10809 | { |
acf2b673 | 10810 | eval_valid = true; |
0c77715b | 10811 | if (mpz_sgn(eval) < 0 |
10812 | || mpz_sizeinbase(eval, 2) >= int_bits | |
10813 | || (lval_valid && mpz_cmp(eval, lval) > 0)) | |
e440a328 | 10814 | { |
631d5788 | 10815 | go_error_at(this->end_->location(), "array index out of bounds"); |
e440a328 | 10816 | this->set_is_error(); |
10817 | } | |
0bd5d859 | 10818 | else if (ival_valid && mpz_cmp(ival, eval) > 0) |
10819 | this->report_error(_("inverted slice range")); | |
e440a328 | 10820 | } |
acf2b673 | 10821 | |
10822 | Numeric_constant cnc; | |
10823 | mpz_t cval; | |
10824 | if (this->cap_ != NULL | |
10825 | && this->cap_->numeric_constant_value(&cnc) && cnc.to_int(&cval)) | |
10826 | { | |
10827 | if (mpz_sgn(cval) < 0 | |
10828 | || mpz_sizeinbase(cval, 2) >= int_bits | |
10829 | || (lval_valid && mpz_cmp(cval, lval) > 0)) | |
10830 | { | |
631d5788 | 10831 | go_error_at(this->cap_->location(), "array index out of bounds"); |
acf2b673 | 10832 | this->set_is_error(); |
10833 | } | |
10834 | else if (ival_valid && mpz_cmp(ival, cval) > 0) | |
10835 | { | |
631d5788 | 10836 | go_error_at(this->cap_->location(), |
10837 | "invalid slice index: capacity less than start"); | |
acf2b673 | 10838 | this->set_is_error(); |
10839 | } | |
10840 | else if (eval_valid && mpz_cmp(eval, cval) > 0) | |
10841 | { | |
631d5788 | 10842 | go_error_at(this->cap_->location(), |
10843 | "invalid slice index: capacity less than length"); | |
acf2b673 | 10844 | this->set_is_error(); |
10845 | } | |
10846 | mpz_clear(cval); | |
10847 | } | |
10848 | ||
10849 | if (eval_valid) | |
10850 | mpz_clear(eval); | |
e440a328 | 10851 | } |
0bd5d859 | 10852 | if (ival_valid) |
10853 | mpz_clear(ival); | |
0c77715b | 10854 | if (lval_valid) |
10855 | mpz_clear(lval); | |
e440a328 | 10856 | |
10857 | // A slice of an array requires an addressable array. A slice of a | |
10858 | // slice is always possible. | |
411eb89e | 10859 | if (this->end_ != NULL && !array_type->is_slice_type()) |
88ec30c8 | 10860 | { |
10861 | if (!this->array_->is_addressable()) | |
8da39c3b | 10862 | this->report_error(_("slice of unaddressable value")); |
88ec30c8 | 10863 | else |
d0a50ed8 | 10864 | { |
10865 | bool escapes = true; | |
10866 | ||
10867 | // When compiling the runtime, a slice operation does not | |
10868 | // cause local variables to escape. When escape analysis | |
10869 | // becomes the default, this should be changed to make it an | |
10870 | // error if we have a slice operation that escapes. | |
10871 | if (gogo->compiling_runtime() && gogo->package_name() == "runtime") | |
10872 | escapes = false; | |
10873 | ||
10874 | this->array_->address_taken(escapes); | |
10875 | } | |
88ec30c8 | 10876 | } |
e440a328 | 10877 | } |
10878 | ||
2c809f8f | 10879 | // Flatten array indexing by using temporary variables for slices and indexes. |
35a54f17 | 10880 | |
10881 | Expression* | |
10882 | Array_index_expression::do_flatten(Gogo*, Named_object*, | |
10883 | Statement_inserter* inserter) | |
10884 | { | |
10885 | Location loc = this->location(); | |
5bf8be8b | 10886 | Expression* array = this->array_; |
10887 | Expression* start = this->start_; | |
10888 | Expression* end = this->end_; | |
10889 | Expression* cap = this->cap_; | |
10890 | if (array->is_error_expression() | |
10891 | || array->type()->is_error_type() | |
10892 | || start->is_error_expression() | |
10893 | || start->type()->is_error_type() | |
10894 | || (end != NULL | |
10895 | && (end->is_error_expression() || end->type()->is_error_type())) | |
10896 | || (cap != NULL | |
10897 | && (cap->is_error_expression() || cap->type()->is_error_type()))) | |
10898 | { | |
10899 | go_assert(saw_errors()); | |
10900 | return Expression::make_error(loc); | |
10901 | } | |
10902 | ||
2c809f8f | 10903 | Temporary_statement* temp; |
5bf8be8b | 10904 | if (array->type()->is_slice_type() && !array->is_variable()) |
35a54f17 | 10905 | { |
5bf8be8b | 10906 | temp = Statement::make_temporary(NULL, array, loc); |
35a54f17 | 10907 | inserter->insert(temp); |
10908 | this->array_ = Expression::make_temporary_reference(temp, loc); | |
10909 | } | |
5bf8be8b | 10910 | if (!start->is_variable()) |
2c809f8f | 10911 | { |
5bf8be8b | 10912 | temp = Statement::make_temporary(NULL, start, loc); |
2c809f8f | 10913 | inserter->insert(temp); |
10914 | this->start_ = Expression::make_temporary_reference(temp, loc); | |
10915 | } | |
5bf8be8b | 10916 | if (end != NULL |
10917 | && !end->is_nil_expression() | |
10918 | && !end->is_variable()) | |
2c809f8f | 10919 | { |
5bf8be8b | 10920 | temp = Statement::make_temporary(NULL, end, loc); |
2c809f8f | 10921 | inserter->insert(temp); |
10922 | this->end_ = Expression::make_temporary_reference(temp, loc); | |
10923 | } | |
03118c21 | 10924 | if (cap != NULL && !cap->is_variable()) |
2c809f8f | 10925 | { |
5bf8be8b | 10926 | temp = Statement::make_temporary(NULL, cap, loc); |
2c809f8f | 10927 | inserter->insert(temp); |
10928 | this->cap_ = Expression::make_temporary_reference(temp, loc); | |
10929 | } | |
10930 | ||
35a54f17 | 10931 | return this; |
10932 | } | |
10933 | ||
e440a328 | 10934 | // Return whether this expression is addressable. |
10935 | ||
10936 | bool | |
10937 | Array_index_expression::do_is_addressable() const | |
10938 | { | |
10939 | // A slice expression is not addressable. | |
10940 | if (this->end_ != NULL) | |
10941 | return false; | |
10942 | ||
10943 | // An index into a slice is addressable. | |
411eb89e | 10944 | if (this->array_->type()->is_slice_type()) |
e440a328 | 10945 | return true; |
10946 | ||
10947 | // An index into an array is addressable if the array is | |
10948 | // addressable. | |
10949 | return this->array_->is_addressable(); | |
10950 | } | |
10951 | ||
ea664253 | 10952 | // Get the backend representation for an array index. |
e440a328 | 10953 | |
ea664253 | 10954 | Bexpression* |
10955 | Array_index_expression::do_get_backend(Translate_context* context) | |
e440a328 | 10956 | { |
e440a328 | 10957 | Array_type* array_type = this->array_->type()->array_type(); |
d8cd8e2d | 10958 | if (array_type == NULL) |
10959 | { | |
c484d925 | 10960 | go_assert(this->array_->type()->is_error()); |
ea664253 | 10961 | return context->backend()->error_expression(); |
d8cd8e2d | 10962 | } |
35a54f17 | 10963 | go_assert(!array_type->is_slice_type() || this->array_->is_variable()); |
e440a328 | 10964 | |
2c809f8f | 10965 | Location loc = this->location(); |
10966 | Gogo* gogo = context->gogo(); | |
10967 | ||
6dfedc16 | 10968 | Type* int_type = Type::lookup_integer_type("int"); |
10969 | Btype* int_btype = int_type->get_backend(gogo); | |
e440a328 | 10970 | |
2c809f8f | 10971 | // We need to convert the length and capacity to the Go "int" type here |
10972 | // because the length of a fixed-length array could be of type "uintptr" | |
10973 | // and gimple disallows binary operations between "uintptr" and other | |
10974 | // integer types. FIXME. | |
10975 | Bexpression* length = NULL; | |
a04bfdfc | 10976 | if (this->end_ == NULL || this->end_->is_nil_expression()) |
10977 | { | |
35a54f17 | 10978 | Expression* len = array_type->get_length(gogo, this->array_); |
ea664253 | 10979 | length = len->get_backend(context); |
2c809f8f | 10980 | length = gogo->backend()->convert_expression(int_btype, length, loc); |
a04bfdfc | 10981 | } |
10982 | ||
2c809f8f | 10983 | Bexpression* capacity = NULL; |
a04bfdfc | 10984 | if (this->end_ != NULL) |
10985 | { | |
35a54f17 | 10986 | Expression* cap = array_type->get_capacity(gogo, this->array_); |
ea664253 | 10987 | capacity = cap->get_backend(context); |
2c809f8f | 10988 | capacity = gogo->backend()->convert_expression(int_btype, capacity, loc); |
a04bfdfc | 10989 | } |
10990 | ||
2c809f8f | 10991 | Bexpression* cap_arg = capacity; |
acf2b673 | 10992 | if (this->cap_ != NULL) |
10993 | { | |
ea664253 | 10994 | cap_arg = this->cap_->get_backend(context); |
2c809f8f | 10995 | cap_arg = gogo->backend()->convert_expression(int_btype, cap_arg, loc); |
acf2b673 | 10996 | } |
10997 | ||
2c809f8f | 10998 | if (length == NULL) |
10999 | length = cap_arg; | |
e440a328 | 11000 | |
11001 | int code = (array_type->length() != NULL | |
11002 | ? (this->end_ == NULL | |
11003 | ? RUNTIME_ERROR_ARRAY_INDEX_OUT_OF_BOUNDS | |
11004 | : RUNTIME_ERROR_ARRAY_SLICE_OUT_OF_BOUNDS) | |
11005 | : (this->end_ == NULL | |
11006 | ? RUNTIME_ERROR_SLICE_INDEX_OUT_OF_BOUNDS | |
11007 | : RUNTIME_ERROR_SLICE_SLICE_OUT_OF_BOUNDS)); | |
ea664253 | 11008 | Bexpression* crash = gogo->runtime_error(code, loc)->get_backend(context); |
2c809f8f | 11009 | |
6dfedc16 | 11010 | if (this->start_->type()->integer_type() == NULL |
11011 | && !Type::are_convertible(int_type, this->start_->type(), NULL)) | |
11012 | { | |
11013 | go_assert(saw_errors()); | |
11014 | return context->backend()->error_expression(); | |
11015 | } | |
d9f3743a | 11016 | |
ea664253 | 11017 | Bexpression* bad_index = |
d9f3743a | 11018 | Expression::check_bounds(this->start_, loc)->get_backend(context); |
2c809f8f | 11019 | |
ea664253 | 11020 | Bexpression* start = this->start_->get_backend(context); |
2c809f8f | 11021 | start = gogo->backend()->convert_expression(int_btype, start, loc); |
11022 | Bexpression* start_too_large = | |
11023 | gogo->backend()->binary_expression((this->end_ == NULL | |
11024 | ? OPERATOR_GE | |
11025 | : OPERATOR_GT), | |
11026 | start, | |
11027 | (this->end_ == NULL | |
11028 | ? length | |
11029 | : capacity), | |
11030 | loc); | |
11031 | bad_index = gogo->backend()->binary_expression(OPERATOR_OROR, start_too_large, | |
11032 | bad_index, loc); | |
e440a328 | 11033 | |
93715b75 | 11034 | Bfunction* bfn = context->function()->func_value()->get_decl(); |
e440a328 | 11035 | if (this->end_ == NULL) |
11036 | { | |
11037 | // Simple array indexing. This has to return an l-value, so | |
2c809f8f | 11038 | // wrap the index check into START. |
11039 | start = | |
93715b75 | 11040 | gogo->backend()->conditional_expression(bfn, int_btype, bad_index, |
2c809f8f | 11041 | crash, start, loc); |
e440a328 | 11042 | |
2c809f8f | 11043 | Bexpression* ret; |
e440a328 | 11044 | if (array_type->length() != NULL) |
11045 | { | |
ea664253 | 11046 | Bexpression* array = this->array_->get_backend(context); |
2c809f8f | 11047 | ret = gogo->backend()->array_index_expression(array, start, loc); |
e440a328 | 11048 | } |
11049 | else | |
11050 | { | |
2c809f8f | 11051 | // Slice. |
11052 | Expression* valptr = | |
35a54f17 | 11053 | array_type->get_value_pointer(gogo, this->array_); |
ea664253 | 11054 | Bexpression* ptr = valptr->get_backend(context); |
2c809f8f | 11055 | ptr = gogo->backend()->pointer_offset_expression(ptr, start, loc); |
9b27b43c | 11056 | |
11057 | Type* ele_type = this->array_->type()->array_type()->element_type(); | |
11058 | Btype* ele_btype = ele_type->get_backend(gogo); | |
11059 | ret = gogo->backend()->indirect_expression(ele_btype, ptr, true, loc); | |
e440a328 | 11060 | } |
ea664253 | 11061 | return ret; |
e440a328 | 11062 | } |
11063 | ||
11064 | // Array slice. | |
11065 | ||
acf2b673 | 11066 | if (this->cap_ != NULL) |
11067 | { | |
2c809f8f | 11068 | Bexpression* bounds_bcheck = |
ea664253 | 11069 | Expression::check_bounds(this->cap_, loc)->get_backend(context); |
2c809f8f | 11070 | bad_index = |
11071 | gogo->backend()->binary_expression(OPERATOR_OROR, bounds_bcheck, | |
11072 | bad_index, loc); | |
11073 | cap_arg = gogo->backend()->convert_expression(int_btype, cap_arg, loc); | |
11074 | ||
11075 | Bexpression* cap_too_small = | |
11076 | gogo->backend()->binary_expression(OPERATOR_LT, cap_arg, start, loc); | |
11077 | Bexpression* cap_too_large = | |
11078 | gogo->backend()->binary_expression(OPERATOR_GT, cap_arg, capacity, loc); | |
11079 | Bexpression* bad_cap = | |
11080 | gogo->backend()->binary_expression(OPERATOR_OROR, cap_too_small, | |
11081 | cap_too_large, loc); | |
11082 | bad_index = gogo->backend()->binary_expression(OPERATOR_OROR, bad_cap, | |
11083 | bad_index, loc); | |
11084 | } | |
11085 | ||
11086 | Bexpression* end; | |
e440a328 | 11087 | if (this->end_->is_nil_expression()) |
2c809f8f | 11088 | end = length; |
e440a328 | 11089 | else |
11090 | { | |
2c809f8f | 11091 | Bexpression* bounds_bcheck = |
ea664253 | 11092 | Expression::check_bounds(this->end_, loc)->get_backend(context); |
e440a328 | 11093 | |
2c809f8f | 11094 | bad_index = |
11095 | gogo->backend()->binary_expression(OPERATOR_OROR, bounds_bcheck, | |
11096 | bad_index, loc); | |
e440a328 | 11097 | |
ea664253 | 11098 | end = this->end_->get_backend(context); |
2c809f8f | 11099 | end = gogo->backend()->convert_expression(int_btype, end, loc); |
11100 | Bexpression* end_too_small = | |
11101 | gogo->backend()->binary_expression(OPERATOR_LT, end, start, loc); | |
11102 | Bexpression* end_too_large = | |
11103 | gogo->backend()->binary_expression(OPERATOR_GT, end, cap_arg, loc); | |
11104 | Bexpression* bad_end = | |
11105 | gogo->backend()->binary_expression(OPERATOR_OROR, end_too_small, | |
11106 | end_too_large, loc); | |
11107 | bad_index = gogo->backend()->binary_expression(OPERATOR_OROR, bad_end, | |
11108 | bad_index, loc); | |
e440a328 | 11109 | } |
11110 | ||
2c809f8f | 11111 | Bexpression* result_length = |
11112 | gogo->backend()->binary_expression(OPERATOR_MINUS, end, start, loc); | |
e440a328 | 11113 | |
2c809f8f | 11114 | Bexpression* result_capacity = |
11115 | gogo->backend()->binary_expression(OPERATOR_MINUS, cap_arg, start, loc); | |
e440a328 | 11116 | |
03118c21 | 11117 | // If the new capacity is zero, don't change val. Otherwise we can |
11118 | // get a pointer to the next object in memory, keeping it live | |
11119 | // unnecessarily. When the capacity is zero, the actual pointer | |
11120 | // value doesn't matter. | |
11121 | Bexpression* zero = | |
11122 | Expression::make_integer_ul(0, int_type, loc)->get_backend(context); | |
11123 | Bexpression* cond = | |
11124 | gogo->backend()->binary_expression(OPERATOR_EQEQ, result_capacity, zero, | |
11125 | loc); | |
11126 | Bexpression* offset = gogo->backend()->conditional_expression(bfn, int_btype, | |
11127 | cond, zero, | |
11128 | start, loc); | |
11129 | Expression* valptr = array_type->get_value_pointer(gogo, this->array_); | |
11130 | Bexpression* val = valptr->get_backend(context); | |
11131 | val = gogo->backend()->pointer_offset_expression(val, offset, loc); | |
11132 | ||
2c809f8f | 11133 | Btype* struct_btype = this->type()->get_backend(gogo); |
11134 | std::vector<Bexpression*> init; | |
11135 | init.push_back(val); | |
11136 | init.push_back(result_length); | |
11137 | init.push_back(result_capacity); | |
e440a328 | 11138 | |
2c809f8f | 11139 | Bexpression* ctor = |
11140 | gogo->backend()->constructor_expression(struct_btype, init, loc); | |
93715b75 | 11141 | return gogo->backend()->conditional_expression(bfn, struct_btype, bad_index, |
ea664253 | 11142 | crash, ctor, loc); |
e440a328 | 11143 | } |
11144 | ||
d751bb78 | 11145 | // Dump ast representation for an array index expression. |
11146 | ||
11147 | void | |
11148 | Array_index_expression::do_dump_expression(Ast_dump_context* ast_dump_context) | |
11149 | const | |
11150 | { | |
11151 | Index_expression::dump_index_expression(ast_dump_context, this->array_, | |
acf2b673 | 11152 | this->start_, this->end_, this->cap_); |
d751bb78 | 11153 | } |
11154 | ||
acf2b673 | 11155 | // Make an array index expression. END and CAP may be NULL. |
e440a328 | 11156 | |
11157 | Expression* | |
11158 | Expression::make_array_index(Expression* array, Expression* start, | |
acf2b673 | 11159 | Expression* end, Expression* cap, |
11160 | Location location) | |
e440a328 | 11161 | { |
acf2b673 | 11162 | return new Array_index_expression(array, start, end, cap, location); |
e440a328 | 11163 | } |
11164 | ||
50075d74 | 11165 | // Class String_index_expression. |
e440a328 | 11166 | |
11167 | // String index traversal. | |
11168 | ||
11169 | int | |
11170 | String_index_expression::do_traverse(Traverse* traverse) | |
11171 | { | |
11172 | if (Expression::traverse(&this->string_, traverse) == TRAVERSE_EXIT) | |
11173 | return TRAVERSE_EXIT; | |
11174 | if (Expression::traverse(&this->start_, traverse) == TRAVERSE_EXIT) | |
11175 | return TRAVERSE_EXIT; | |
11176 | if (this->end_ != NULL) | |
11177 | { | |
11178 | if (Expression::traverse(&this->end_, traverse) == TRAVERSE_EXIT) | |
11179 | return TRAVERSE_EXIT; | |
11180 | } | |
11181 | return TRAVERSE_CONTINUE; | |
11182 | } | |
11183 | ||
2c809f8f | 11184 | Expression* |
11185 | String_index_expression::do_flatten(Gogo*, Named_object*, | |
11186 | Statement_inserter* inserter) | |
e440a328 | 11187 | { |
2c809f8f | 11188 | Location loc = this->location(); |
5bf8be8b | 11189 | Expression* string = this->string_; |
11190 | Expression* start = this->start_; | |
11191 | Expression* end = this->end_; | |
11192 | if (string->is_error_expression() | |
11193 | || string->type()->is_error_type() | |
11194 | || start->is_error_expression() | |
11195 | || start->type()->is_error_type() | |
11196 | || (end != NULL | |
11197 | && (end->is_error_expression() || end->type()->is_error_type()))) | |
11198 | { | |
11199 | go_assert(saw_errors()); | |
11200 | return Expression::make_error(loc); | |
11201 | } | |
11202 | ||
11203 | Temporary_statement* temp; | |
2c809f8f | 11204 | if (!this->string_->is_variable()) |
11205 | { | |
11206 | temp = Statement::make_temporary(NULL, this->string_, loc); | |
11207 | inserter->insert(temp); | |
11208 | this->string_ = Expression::make_temporary_reference(temp, loc); | |
11209 | } | |
11210 | if (!this->start_->is_variable()) | |
11211 | { | |
11212 | temp = Statement::make_temporary(NULL, this->start_, loc); | |
11213 | inserter->insert(temp); | |
11214 | this->start_ = Expression::make_temporary_reference(temp, loc); | |
11215 | } | |
11216 | if (this->end_ != NULL | |
11217 | && !this->end_->is_nil_expression() | |
11218 | && !this->end_->is_variable()) | |
11219 | { | |
11220 | temp = Statement::make_temporary(NULL, this->end_, loc); | |
11221 | inserter->insert(temp); | |
11222 | this->end_ = Expression::make_temporary_reference(temp, loc); | |
11223 | } | |
11224 | ||
11225 | return this; | |
11226 | } | |
11227 | ||
11228 | // Return the type of a string index. | |
11229 | ||
11230 | Type* | |
11231 | String_index_expression::do_type() | |
11232 | { | |
11233 | if (this->end_ == NULL) | |
11234 | return Type::lookup_integer_type("uint8"); | |
11235 | else | |
11236 | return this->string_->type(); | |
11237 | } | |
11238 | ||
11239 | // Determine the type of a string index. | |
11240 | ||
11241 | void | |
11242 | String_index_expression::do_determine_type(const Type_context*) | |
11243 | { | |
11244 | this->string_->determine_type_no_context(); | |
f77aa642 | 11245 | |
11246 | Type_context index_context(Type::lookup_integer_type("int"), false); | |
11247 | if (this->start_->is_constant()) | |
11248 | this->start_->determine_type(&index_context); | |
11249 | else | |
11250 | this->start_->determine_type_no_context(); | |
e440a328 | 11251 | if (this->end_ != NULL) |
f77aa642 | 11252 | { |
11253 | if (this->end_->is_constant()) | |
11254 | this->end_->determine_type(&index_context); | |
11255 | else | |
11256 | this->end_->determine_type_no_context(); | |
11257 | } | |
e440a328 | 11258 | } |
11259 | ||
11260 | // Check types of a string index. | |
11261 | ||
11262 | void | |
11263 | String_index_expression::do_check_types(Gogo*) | |
11264 | { | |
acdc230d | 11265 | Numeric_constant nc; |
11266 | unsigned long v; | |
11267 | if (this->start_->type()->integer_type() == NULL | |
11268 | && !this->start_->type()->is_error() | |
11269 | && (!this->start_->numeric_constant_value(&nc) | |
11270 | || nc.to_unsigned_long(&v) == Numeric_constant::NC_UL_NOTINT)) | |
e440a328 | 11271 | this->report_error(_("index must be integer")); |
11272 | if (this->end_ != NULL | |
11273 | && this->end_->type()->integer_type() == NULL | |
acdc230d | 11274 | && !this->end_->type()->is_error() |
11275 | && !this->end_->is_nil_expression() | |
11276 | && !this->end_->is_error_expression() | |
11277 | && (!this->end_->numeric_constant_value(&nc) | |
11278 | || nc.to_unsigned_long(&v) == Numeric_constant::NC_UL_NOTINT)) | |
e440a328 | 11279 | this->report_error(_("slice end must be integer")); |
11280 | ||
11281 | std::string sval; | |
11282 | bool sval_valid = this->string_->string_constant_value(&sval); | |
11283 | ||
0c77715b | 11284 | Numeric_constant inc; |
e440a328 | 11285 | mpz_t ival; |
0bd5d859 | 11286 | bool ival_valid = false; |
0c77715b | 11287 | if (this->start_->numeric_constant_value(&inc) && inc.to_int(&ival)) |
e440a328 | 11288 | { |
0bd5d859 | 11289 | ival_valid = true; |
e440a328 | 11290 | if (mpz_sgn(ival) < 0 |
b10f32fb | 11291 | || (sval_valid |
11292 | && (this->end_ == NULL | |
11293 | ? mpz_cmp_ui(ival, sval.length()) >= 0 | |
11294 | : mpz_cmp_ui(ival, sval.length()) > 0))) | |
e440a328 | 11295 | { |
631d5788 | 11296 | go_error_at(this->start_->location(), "string index out of bounds"); |
e440a328 | 11297 | this->set_is_error(); |
11298 | } | |
11299 | } | |
11300 | if (this->end_ != NULL && !this->end_->is_nil_expression()) | |
11301 | { | |
0c77715b | 11302 | Numeric_constant enc; |
11303 | mpz_t eval; | |
11304 | if (this->end_->numeric_constant_value(&enc) && enc.to_int(&eval)) | |
e440a328 | 11305 | { |
0c77715b | 11306 | if (mpz_sgn(eval) < 0 |
11307 | || (sval_valid && mpz_cmp_ui(eval, sval.length()) > 0)) | |
e440a328 | 11308 | { |
631d5788 | 11309 | go_error_at(this->end_->location(), "string index out of bounds"); |
e440a328 | 11310 | this->set_is_error(); |
11311 | } | |
0bd5d859 | 11312 | else if (ival_valid && mpz_cmp(ival, eval) > 0) |
11313 | this->report_error(_("inverted slice range")); | |
0c77715b | 11314 | mpz_clear(eval); |
e440a328 | 11315 | } |
11316 | } | |
0bd5d859 | 11317 | if (ival_valid) |
11318 | mpz_clear(ival); | |
e440a328 | 11319 | } |
11320 | ||
ea664253 | 11321 | // Get the backend representation for a string index. |
e440a328 | 11322 | |
ea664253 | 11323 | Bexpression* |
11324 | String_index_expression::do_get_backend(Translate_context* context) | |
e440a328 | 11325 | { |
b13c66cd | 11326 | Location loc = this->location(); |
2c809f8f | 11327 | Expression* string_arg = this->string_; |
11328 | if (this->string_->type()->points_to() != NULL) | |
11329 | string_arg = Expression::make_unary(OPERATOR_MULT, this->string_, loc); | |
e440a328 | 11330 | |
2c809f8f | 11331 | Expression* bad_index = Expression::check_bounds(this->start_, loc); |
e440a328 | 11332 | |
2c809f8f | 11333 | int code = (this->end_ == NULL |
11334 | ? RUNTIME_ERROR_STRING_INDEX_OUT_OF_BOUNDS | |
11335 | : RUNTIME_ERROR_STRING_SLICE_OUT_OF_BOUNDS); | |
e440a328 | 11336 | |
2c809f8f | 11337 | Gogo* gogo = context->gogo(); |
ea664253 | 11338 | Bexpression* crash = gogo->runtime_error(code, loc)->get_backend(context); |
1b1f2abf | 11339 | |
11340 | Type* int_type = Type::lookup_integer_type("int"); | |
e440a328 | 11341 | |
2c809f8f | 11342 | // It is possible that an error occurred earlier because the start index |
11343 | // cannot be represented as an integer type. In this case, we shouldn't | |
11344 | // try casting the starting index into an integer since | |
11345 | // Type_conversion_expression will fail to get the backend representation. | |
11346 | // FIXME. | |
11347 | if (this->start_->type()->integer_type() == NULL | |
11348 | && !Type::are_convertible(int_type, this->start_->type(), NULL)) | |
11349 | { | |
11350 | go_assert(saw_errors()); | |
ea664253 | 11351 | return context->backend()->error_expression(); |
2c809f8f | 11352 | } |
e440a328 | 11353 | |
2c809f8f | 11354 | Expression* start = Expression::make_cast(int_type, this->start_, loc); |
93715b75 | 11355 | Bfunction* bfn = context->function()->func_value()->get_decl(); |
e440a328 | 11356 | |
2c809f8f | 11357 | if (this->end_ == NULL) |
11358 | { | |
11359 | Expression* length = | |
11360 | Expression::make_string_info(this->string_, STRING_INFO_LENGTH, loc); | |
e440a328 | 11361 | |
2c809f8f | 11362 | Expression* start_too_large = |
11363 | Expression::make_binary(OPERATOR_GE, start, length, loc); | |
11364 | bad_index = Expression::make_binary(OPERATOR_OROR, start_too_large, | |
11365 | bad_index, loc); | |
11366 | Expression* bytes = | |
11367 | Expression::make_string_info(this->string_, STRING_INFO_DATA, loc); | |
e440a328 | 11368 | |
ea664253 | 11369 | Bexpression* bstart = start->get_backend(context); |
11370 | Bexpression* ptr = bytes->get_backend(context); | |
2c809f8f | 11371 | ptr = gogo->backend()->pointer_offset_expression(ptr, bstart, loc); |
9b27b43c | 11372 | Btype* ubtype = Type::lookup_integer_type("uint8")->get_backend(gogo); |
11373 | Bexpression* index = | |
11374 | gogo->backend()->indirect_expression(ubtype, ptr, true, loc); | |
e440a328 | 11375 | |
2c809f8f | 11376 | Btype* byte_btype = bytes->type()->points_to()->get_backend(gogo); |
ea664253 | 11377 | Bexpression* index_error = bad_index->get_backend(context); |
93715b75 | 11378 | return gogo->backend()->conditional_expression(bfn, byte_btype, |
11379 | index_error, crash, | |
11380 | index, loc); | |
2c809f8f | 11381 | } |
11382 | ||
11383 | Expression* end = NULL; | |
11384 | if (this->end_->is_nil_expression()) | |
e67508fa | 11385 | end = Expression::make_integer_sl(-1, int_type, loc); |
e440a328 | 11386 | else |
11387 | { | |
2c809f8f | 11388 | Expression* bounds_check = Expression::check_bounds(this->end_, loc); |
11389 | bad_index = | |
11390 | Expression::make_binary(OPERATOR_OROR, bounds_check, bad_index, loc); | |
11391 | end = Expression::make_cast(int_type, this->end_, loc); | |
e440a328 | 11392 | } |
2c809f8f | 11393 | |
11394 | Expression* strslice = Runtime::make_call(Runtime::STRING_SLICE, loc, 3, | |
11395 | string_arg, start, end); | |
ea664253 | 11396 | Bexpression* bstrslice = strslice->get_backend(context); |
2c809f8f | 11397 | |
11398 | Btype* str_btype = strslice->type()->get_backend(gogo); | |
ea664253 | 11399 | Bexpression* index_error = bad_index->get_backend(context); |
93715b75 | 11400 | return gogo->backend()->conditional_expression(bfn, str_btype, index_error, |
ea664253 | 11401 | crash, bstrslice, loc); |
e440a328 | 11402 | } |
11403 | ||
d751bb78 | 11404 | // Dump ast representation for a string index expression. |
11405 | ||
11406 | void | |
11407 | String_index_expression::do_dump_expression(Ast_dump_context* ast_dump_context) | |
11408 | const | |
11409 | { | |
acf2b673 | 11410 | Index_expression::dump_index_expression(ast_dump_context, this->string_, |
11411 | this->start_, this->end_, NULL); | |
d751bb78 | 11412 | } |
11413 | ||
e440a328 | 11414 | // Make a string index expression. END may be NULL. |
11415 | ||
11416 | Expression* | |
11417 | Expression::make_string_index(Expression* string, Expression* start, | |
b13c66cd | 11418 | Expression* end, Location location) |
e440a328 | 11419 | { |
11420 | return new String_index_expression(string, start, end, location); | |
11421 | } | |
11422 | ||
11423 | // Class Map_index. | |
11424 | ||
11425 | // Get the type of the map. | |
11426 | ||
11427 | Map_type* | |
11428 | Map_index_expression::get_map_type() const | |
11429 | { | |
0d5530d9 | 11430 | Map_type* mt = this->map_->type()->map_type(); |
c7524fae | 11431 | if (mt == NULL) |
c484d925 | 11432 | go_assert(saw_errors()); |
e440a328 | 11433 | return mt; |
11434 | } | |
11435 | ||
11436 | // Map index traversal. | |
11437 | ||
11438 | int | |
11439 | Map_index_expression::do_traverse(Traverse* traverse) | |
11440 | { | |
11441 | if (Expression::traverse(&this->map_, traverse) == TRAVERSE_EXIT) | |
11442 | return TRAVERSE_EXIT; | |
11443 | return Expression::traverse(&this->index_, traverse); | |
11444 | } | |
11445 | ||
2c809f8f | 11446 | // We need to pass in a pointer to the key, so flatten the index into a |
11447 | // temporary variable if it isn't already. The value pointer will be | |
11448 | // dereferenced and checked for nil, so flatten into a temporary to avoid | |
11449 | // recomputation. | |
11450 | ||
11451 | Expression* | |
91c0fd76 | 11452 | Map_index_expression::do_flatten(Gogo* gogo, Named_object*, |
2c809f8f | 11453 | Statement_inserter* inserter) |
11454 | { | |
91c0fd76 | 11455 | Location loc = this->location(); |
2c809f8f | 11456 | Map_type* mt = this->get_map_type(); |
5bf8be8b | 11457 | if (this->index()->is_error_expression() |
11458 | || this->index()->type()->is_error_type() | |
11459 | || mt->is_error_type()) | |
11460 | { | |
11461 | go_assert(saw_errors()); | |
11462 | return Expression::make_error(loc); | |
11463 | } | |
11464 | ||
91c0fd76 | 11465 | if (!Type::are_identical(mt->key_type(), this->index_->type(), false, NULL)) |
11466 | { | |
11467 | if (this->index_->type()->interface_type() != NULL | |
11468 | && !this->index_->is_variable()) | |
11469 | { | |
11470 | Temporary_statement* temp = | |
11471 | Statement::make_temporary(NULL, this->index_, loc); | |
11472 | inserter->insert(temp); | |
11473 | this->index_ = Expression::make_temporary_reference(temp, loc); | |
11474 | } | |
11475 | this->index_ = Expression::convert_for_assignment(gogo, mt->key_type(), | |
11476 | this->index_, loc); | |
11477 | } | |
2c809f8f | 11478 | |
11479 | if (!this->index_->is_variable()) | |
11480 | { | |
11481 | Temporary_statement* temp = Statement::make_temporary(NULL, this->index_, | |
91c0fd76 | 11482 | loc); |
2c809f8f | 11483 | inserter->insert(temp); |
91c0fd76 | 11484 | this->index_ = Expression::make_temporary_reference(temp, loc); |
2c809f8f | 11485 | } |
11486 | ||
11487 | if (this->value_pointer_ == NULL) | |
0d5530d9 | 11488 | this->get_value_pointer(gogo); |
5bf8be8b | 11489 | if (this->value_pointer_->is_error_expression() |
11490 | || this->value_pointer_->type()->is_error_type()) | |
11491 | return Expression::make_error(loc); | |
2c809f8f | 11492 | if (!this->value_pointer_->is_variable()) |
11493 | { | |
11494 | Temporary_statement* temp = | |
91c0fd76 | 11495 | Statement::make_temporary(NULL, this->value_pointer_, loc); |
2c809f8f | 11496 | inserter->insert(temp); |
91c0fd76 | 11497 | this->value_pointer_ = Expression::make_temporary_reference(temp, loc); |
2c809f8f | 11498 | } |
11499 | ||
11500 | return this; | |
11501 | } | |
11502 | ||
e440a328 | 11503 | // Return the type of a map index. |
11504 | ||
11505 | Type* | |
11506 | Map_index_expression::do_type() | |
11507 | { | |
c7524fae | 11508 | Map_type* mt = this->get_map_type(); |
11509 | if (mt == NULL) | |
11510 | return Type::make_error_type(); | |
0d5530d9 | 11511 | return mt->val_type(); |
e440a328 | 11512 | } |
11513 | ||
11514 | // Fix the type of a map index. | |
11515 | ||
11516 | void | |
11517 | Map_index_expression::do_determine_type(const Type_context*) | |
11518 | { | |
11519 | this->map_->determine_type_no_context(); | |
c7524fae | 11520 | Map_type* mt = this->get_map_type(); |
11521 | Type* key_type = mt == NULL ? NULL : mt->key_type(); | |
11522 | Type_context subcontext(key_type, false); | |
e440a328 | 11523 | this->index_->determine_type(&subcontext); |
11524 | } | |
11525 | ||
11526 | // Check types of a map index. | |
11527 | ||
11528 | void | |
11529 | Map_index_expression::do_check_types(Gogo*) | |
11530 | { | |
11531 | std::string reason; | |
c7524fae | 11532 | Map_type* mt = this->get_map_type(); |
11533 | if (mt == NULL) | |
11534 | return; | |
11535 | if (!Type::are_assignable(mt->key_type(), this->index_->type(), &reason)) | |
e440a328 | 11536 | { |
11537 | if (reason.empty()) | |
11538 | this->report_error(_("incompatible type for map index")); | |
11539 | else | |
11540 | { | |
631d5788 | 11541 | go_error_at(this->location(), "incompatible type for map index (%s)", |
11542 | reason.c_str()); | |
e440a328 | 11543 | this->set_is_error(); |
11544 | } | |
11545 | } | |
11546 | } | |
11547 | ||
ea664253 | 11548 | // Get the backend representation for a map index. |
e440a328 | 11549 | |
ea664253 | 11550 | Bexpression* |
11551 | Map_index_expression::do_get_backend(Translate_context* context) | |
e440a328 | 11552 | { |
11553 | Map_type* type = this->get_map_type(); | |
c7524fae | 11554 | if (type == NULL) |
2c809f8f | 11555 | { |
11556 | go_assert(saw_errors()); | |
ea664253 | 11557 | return context->backend()->error_expression(); |
2c809f8f | 11558 | } |
e440a328 | 11559 | |
2c809f8f | 11560 | go_assert(this->value_pointer_ != NULL |
11561 | && this->value_pointer_->is_variable()); | |
e440a328 | 11562 | |
0d5530d9 | 11563 | Expression* val = Expression::make_unary(OPERATOR_MULT, this->value_pointer_, |
11564 | this->location()); | |
11565 | return val->get_backend(context); | |
e440a328 | 11566 | } |
11567 | ||
0d5530d9 | 11568 | // Get an expression for the map index. This returns an expression |
11569 | // that evaluates to a pointer to a value. If the key is not in the | |
11570 | // map, the pointer will point to a zero value. | |
e440a328 | 11571 | |
2c809f8f | 11572 | Expression* |
0d5530d9 | 11573 | Map_index_expression::get_value_pointer(Gogo* gogo) |
e440a328 | 11574 | { |
2c809f8f | 11575 | if (this->value_pointer_ == NULL) |
746d2e73 | 11576 | { |
2c809f8f | 11577 | Map_type* type = this->get_map_type(); |
11578 | if (type == NULL) | |
746d2e73 | 11579 | { |
2c809f8f | 11580 | go_assert(saw_errors()); |
11581 | return Expression::make_error(this->location()); | |
746d2e73 | 11582 | } |
e440a328 | 11583 | |
2c809f8f | 11584 | Location loc = this->location(); |
11585 | Expression* map_ref = this->map_; | |
e440a328 | 11586 | |
0d5530d9 | 11587 | Expression* index_ptr = Expression::make_unary(OPERATOR_AND, |
11588 | this->index_, | |
2c809f8f | 11589 | loc); |
0d5530d9 | 11590 | |
11591 | Expression* zero = type->fat_zero_value(gogo); | |
11592 | ||
11593 | Expression* map_index; | |
11594 | ||
11595 | if (zero == NULL) | |
11596 | map_index = | |
11597 | Runtime::make_call(Runtime::MAPACCESS1, loc, 3, | |
11598 | Expression::make_type_descriptor(type, loc), | |
11599 | map_ref, index_ptr); | |
11600 | else | |
11601 | map_index = | |
11602 | Runtime::make_call(Runtime::MAPACCESS1_FAT, loc, 4, | |
11603 | Expression::make_type_descriptor(type, loc), | |
11604 | map_ref, index_ptr, zero); | |
2c809f8f | 11605 | |
11606 | Type* val_type = type->val_type(); | |
11607 | this->value_pointer_ = | |
11608 | Expression::make_unsafe_cast(Type::make_pointer_type(val_type), | |
11609 | map_index, this->location()); | |
11610 | } | |
0d5530d9 | 11611 | |
2c809f8f | 11612 | return this->value_pointer_; |
e440a328 | 11613 | } |
11614 | ||
d751bb78 | 11615 | // Dump ast representation for a map index expression |
11616 | ||
11617 | void | |
11618 | Map_index_expression::do_dump_expression(Ast_dump_context* ast_dump_context) | |
11619 | const | |
11620 | { | |
acf2b673 | 11621 | Index_expression::dump_index_expression(ast_dump_context, this->map_, |
11622 | this->index_, NULL, NULL); | |
d751bb78 | 11623 | } |
11624 | ||
e440a328 | 11625 | // Make a map index expression. |
11626 | ||
11627 | Map_index_expression* | |
11628 | Expression::make_map_index(Expression* map, Expression* index, | |
b13c66cd | 11629 | Location location) |
e440a328 | 11630 | { |
11631 | return new Map_index_expression(map, index, location); | |
11632 | } | |
11633 | ||
11634 | // Class Field_reference_expression. | |
11635 | ||
149eabc5 | 11636 | // Lower a field reference expression. There is nothing to lower, but |
11637 | // this is where we generate the tracking information for fields with | |
11638 | // the magic go:"track" tag. | |
11639 | ||
11640 | Expression* | |
11641 | Field_reference_expression::do_lower(Gogo* gogo, Named_object* function, | |
11642 | Statement_inserter* inserter, int) | |
11643 | { | |
11644 | Struct_type* struct_type = this->expr_->type()->struct_type(); | |
11645 | if (struct_type == NULL) | |
11646 | { | |
11647 | // Error will be reported elsewhere. | |
11648 | return this; | |
11649 | } | |
11650 | const Struct_field* field = struct_type->field(this->field_index_); | |
11651 | if (field == NULL) | |
11652 | return this; | |
11653 | if (!field->has_tag()) | |
11654 | return this; | |
11655 | if (field->tag().find("go:\"track\"") == std::string::npos) | |
11656 | return this; | |
11657 | ||
604e278d | 11658 | // References from functions generated by the compiler don't count. |
c6292d1d | 11659 | if (function != NULL && function->func_value()->is_type_specific_function()) |
604e278d | 11660 | return this; |
11661 | ||
149eabc5 | 11662 | // We have found a reference to a tracked field. Build a call to |
11663 | // the runtime function __go_fieldtrack with a string that describes | |
11664 | // the field. FIXME: We should only call this once per referenced | |
11665 | // field per function, not once for each reference to the field. | |
11666 | ||
11667 | if (this->called_fieldtrack_) | |
11668 | return this; | |
11669 | this->called_fieldtrack_ = true; | |
11670 | ||
11671 | Location loc = this->location(); | |
11672 | ||
11673 | std::string s = "fieldtrack \""; | |
11674 | Named_type* nt = this->expr_->type()->named_type(); | |
11675 | if (nt == NULL || nt->named_object()->package() == NULL) | |
11676 | s.append(gogo->pkgpath()); | |
11677 | else | |
11678 | s.append(nt->named_object()->package()->pkgpath()); | |
11679 | s.push_back('.'); | |
11680 | if (nt != NULL) | |
5c29ad36 | 11681 | s.append(Gogo::unpack_hidden_name(nt->name())); |
149eabc5 | 11682 | s.push_back('.'); |
11683 | s.append(field->field_name()); | |
11684 | s.push_back('"'); | |
11685 | ||
11686 | // We can't use a string here, because internally a string holds a | |
11687 | // pointer to the actual bytes; when the linker garbage collects the | |
11688 | // string, it won't garbage collect the bytes. So we use a | |
11689 | // [...]byte. | |
11690 | ||
e67508fa | 11691 | Expression* length_expr = Expression::make_integer_ul(s.length(), NULL, loc); |
149eabc5 | 11692 | |
11693 | Type* byte_type = gogo->lookup_global("byte")->type_value(); | |
6bf4793c | 11694 | Array_type* array_type = Type::make_array_type(byte_type, length_expr); |
11695 | array_type->set_is_array_incomparable(); | |
149eabc5 | 11696 | |
11697 | Expression_list* bytes = new Expression_list(); | |
11698 | for (std::string::const_iterator p = s.begin(); p != s.end(); p++) | |
11699 | { | |
e67508fa | 11700 | unsigned char c = static_cast<unsigned char>(*p); |
11701 | bytes->push_back(Expression::make_integer_ul(c, NULL, loc)); | |
149eabc5 | 11702 | } |
11703 | ||
11704 | Expression* e = Expression::make_composite_literal(array_type, 0, false, | |
62750cd5 | 11705 | bytes, false, loc); |
149eabc5 | 11706 | |
11707 | Variable* var = new Variable(array_type, e, true, false, false, loc); | |
11708 | ||
11709 | static int count; | |
11710 | char buf[50]; | |
11711 | snprintf(buf, sizeof buf, "fieldtrack.%d", count); | |
11712 | ++count; | |
11713 | ||
11714 | Named_object* no = gogo->add_variable(buf, var); | |
11715 | e = Expression::make_var_reference(no, loc); | |
11716 | e = Expression::make_unary(OPERATOR_AND, e, loc); | |
11717 | ||
11718 | Expression* call = Runtime::make_call(Runtime::FIELDTRACK, loc, 1, e); | |
604e278d | 11719 | gogo->lower_expression(function, inserter, &call); |
149eabc5 | 11720 | inserter->insert(Statement::make_statement(call, false)); |
11721 | ||
11722 | // Put this function, and the global variable we just created, into | |
11723 | // unique sections. This will permit the linker to garbage collect | |
11724 | // them if they are not referenced. The effect is that the only | |
11725 | // strings, indicating field references, that will wind up in the | |
11726 | // executable will be those for functions that are actually needed. | |
66a6be58 | 11727 | if (function != NULL) |
11728 | function->func_value()->set_in_unique_section(); | |
149eabc5 | 11729 | var->set_in_unique_section(); |
11730 | ||
11731 | return this; | |
11732 | } | |
11733 | ||
e440a328 | 11734 | // Return the type of a field reference. |
11735 | ||
11736 | Type* | |
11737 | Field_reference_expression::do_type() | |
11738 | { | |
b0e628fb | 11739 | Type* type = this->expr_->type(); |
5c13bd80 | 11740 | if (type->is_error()) |
b0e628fb | 11741 | return type; |
11742 | Struct_type* struct_type = type->struct_type(); | |
c484d925 | 11743 | go_assert(struct_type != NULL); |
e440a328 | 11744 | return struct_type->field(this->field_index_)->type(); |
11745 | } | |
11746 | ||
11747 | // Check the types for a field reference. | |
11748 | ||
11749 | void | |
11750 | Field_reference_expression::do_check_types(Gogo*) | |
11751 | { | |
b0e628fb | 11752 | Type* type = this->expr_->type(); |
5c13bd80 | 11753 | if (type->is_error()) |
b0e628fb | 11754 | return; |
11755 | Struct_type* struct_type = type->struct_type(); | |
c484d925 | 11756 | go_assert(struct_type != NULL); |
11757 | go_assert(struct_type->field(this->field_index_) != NULL); | |
e440a328 | 11758 | } |
11759 | ||
ea664253 | 11760 | // Get the backend representation for a field reference. |
e440a328 | 11761 | |
ea664253 | 11762 | Bexpression* |
11763 | Field_reference_expression::do_get_backend(Translate_context* context) | |
e440a328 | 11764 | { |
ea664253 | 11765 | Bexpression* bstruct = this->expr_->get_backend(context); |
11766 | return context->gogo()->backend()->struct_field_expression(bstruct, | |
11767 | this->field_index_, | |
11768 | this->location()); | |
e440a328 | 11769 | } |
11770 | ||
d751bb78 | 11771 | // Dump ast representation for a field reference expression. |
11772 | ||
11773 | void | |
11774 | Field_reference_expression::do_dump_expression( | |
11775 | Ast_dump_context* ast_dump_context) const | |
11776 | { | |
11777 | this->expr_->dump_expression(ast_dump_context); | |
11778 | ast_dump_context->ostream() << "." << this->field_index_; | |
11779 | } | |
11780 | ||
e440a328 | 11781 | // Make a reference to a qualified identifier in an expression. |
11782 | ||
11783 | Field_reference_expression* | |
11784 | Expression::make_field_reference(Expression* expr, unsigned int field_index, | |
b13c66cd | 11785 | Location location) |
e440a328 | 11786 | { |
11787 | return new Field_reference_expression(expr, field_index, location); | |
11788 | } | |
11789 | ||
11790 | // Class Interface_field_reference_expression. | |
11791 | ||
2387f644 | 11792 | // Return an expression for the pointer to the function to call. |
e440a328 | 11793 | |
2387f644 | 11794 | Expression* |
11795 | Interface_field_reference_expression::get_function() | |
e440a328 | 11796 | { |
2387f644 | 11797 | Expression* ref = this->expr_; |
11798 | Location loc = this->location(); | |
11799 | if (ref->type()->points_to() != NULL) | |
11800 | ref = Expression::make_unary(OPERATOR_MULT, ref, loc); | |
e440a328 | 11801 | |
2387f644 | 11802 | Expression* mtable = |
11803 | Expression::make_interface_info(ref, INTERFACE_INFO_METHODS, loc); | |
11804 | Struct_type* mtable_type = mtable->type()->points_to()->struct_type(); | |
e440a328 | 11805 | |
11806 | std::string name = Gogo::unpack_hidden_name(this->name_); | |
2387f644 | 11807 | unsigned int index; |
11808 | const Struct_field* field = mtable_type->find_local_field(name, &index); | |
11809 | go_assert(field != NULL); | |
11810 | mtable = Expression::make_unary(OPERATOR_MULT, mtable, loc); | |
11811 | return Expression::make_field_reference(mtable, index, loc); | |
e440a328 | 11812 | } |
11813 | ||
2387f644 | 11814 | // Return an expression for the first argument to pass to the interface |
e440a328 | 11815 | // function. |
11816 | ||
2387f644 | 11817 | Expression* |
11818 | Interface_field_reference_expression::get_underlying_object() | |
e440a328 | 11819 | { |
2387f644 | 11820 | Expression* expr = this->expr_; |
11821 | if (expr->type()->points_to() != NULL) | |
11822 | expr = Expression::make_unary(OPERATOR_MULT, expr, this->location()); | |
11823 | return Expression::make_interface_info(expr, INTERFACE_INFO_OBJECT, | |
11824 | this->location()); | |
e440a328 | 11825 | } |
11826 | ||
11827 | // Traversal. | |
11828 | ||
11829 | int | |
11830 | Interface_field_reference_expression::do_traverse(Traverse* traverse) | |
11831 | { | |
11832 | return Expression::traverse(&this->expr_, traverse); | |
11833 | } | |
11834 | ||
0afbb937 | 11835 | // Lower the expression. If this expression is not called, we need to |
11836 | // evaluate the expression twice when converting to the backend | |
11837 | // interface. So introduce a temporary variable if necessary. | |
11838 | ||
11839 | Expression* | |
9782d556 | 11840 | Interface_field_reference_expression::do_flatten(Gogo*, Named_object*, |
11841 | Statement_inserter* inserter) | |
0afbb937 | 11842 | { |
5bf8be8b | 11843 | if (this->expr_->is_error_expression() |
11844 | || this->expr_->type()->is_error_type()) | |
11845 | { | |
11846 | go_assert(saw_errors()); | |
11847 | return Expression::make_error(this->location()); | |
11848 | } | |
11849 | ||
2387f644 | 11850 | if (!this->expr_->is_variable()) |
0afbb937 | 11851 | { |
11852 | Temporary_statement* temp = | |
11853 | Statement::make_temporary(this->expr_->type(), NULL, this->location()); | |
11854 | inserter->insert(temp); | |
11855 | this->expr_ = Expression::make_set_and_use_temporary(temp, this->expr_, | |
11856 | this->location()); | |
11857 | } | |
11858 | return this; | |
11859 | } | |
11860 | ||
e440a328 | 11861 | // Return the type of an interface field reference. |
11862 | ||
11863 | Type* | |
11864 | Interface_field_reference_expression::do_type() | |
11865 | { | |
11866 | Type* expr_type = this->expr_->type(); | |
11867 | ||
11868 | Type* points_to = expr_type->points_to(); | |
11869 | if (points_to != NULL) | |
11870 | expr_type = points_to; | |
11871 | ||
11872 | Interface_type* interface_type = expr_type->interface_type(); | |
11873 | if (interface_type == NULL) | |
11874 | return Type::make_error_type(); | |
11875 | ||
11876 | const Typed_identifier* method = interface_type->find_method(this->name_); | |
11877 | if (method == NULL) | |
11878 | return Type::make_error_type(); | |
11879 | ||
11880 | return method->type(); | |
11881 | } | |
11882 | ||
11883 | // Determine types. | |
11884 | ||
11885 | void | |
11886 | Interface_field_reference_expression::do_determine_type(const Type_context*) | |
11887 | { | |
11888 | this->expr_->determine_type_no_context(); | |
11889 | } | |
11890 | ||
11891 | // Check the types for an interface field reference. | |
11892 | ||
11893 | void | |
11894 | Interface_field_reference_expression::do_check_types(Gogo*) | |
11895 | { | |
11896 | Type* type = this->expr_->type(); | |
11897 | ||
11898 | Type* points_to = type->points_to(); | |
11899 | if (points_to != NULL) | |
11900 | type = points_to; | |
11901 | ||
11902 | Interface_type* interface_type = type->interface_type(); | |
11903 | if (interface_type == NULL) | |
5c491127 | 11904 | { |
11905 | if (!type->is_error_type()) | |
11906 | this->report_error(_("expected interface or pointer to interface")); | |
11907 | } | |
e440a328 | 11908 | else |
11909 | { | |
11910 | const Typed_identifier* method = | |
11911 | interface_type->find_method(this->name_); | |
11912 | if (method == NULL) | |
11913 | { | |
631d5788 | 11914 | go_error_at(this->location(), "method %qs not in interface", |
11915 | Gogo::message_name(this->name_).c_str()); | |
e440a328 | 11916 | this->set_is_error(); |
11917 | } | |
11918 | } | |
11919 | } | |
11920 | ||
0afbb937 | 11921 | // If an interface field reference is not simply called, then it is |
11922 | // represented as a closure. The closure will hold a single variable, | |
11923 | // the value of the interface on which the method should be called. | |
11924 | // The function will be a simple thunk that pulls the value from the | |
11925 | // closure and calls the method with the remaining arguments. | |
11926 | ||
11927 | // Because method values are not common, we don't build all thunks for | |
11928 | // all possible interface methods, but instead only build them as we | |
11929 | // need them. In particular, we even build them on demand for | |
11930 | // interface methods defined in other packages. | |
11931 | ||
11932 | Interface_field_reference_expression::Interface_method_thunks | |
11933 | Interface_field_reference_expression::interface_method_thunks; | |
11934 | ||
11935 | // Find or create the thunk to call method NAME on TYPE. | |
11936 | ||
11937 | Named_object* | |
11938 | Interface_field_reference_expression::create_thunk(Gogo* gogo, | |
11939 | Interface_type* type, | |
11940 | const std::string& name) | |
11941 | { | |
11942 | std::pair<Interface_type*, Method_thunks*> val(type, NULL); | |
11943 | std::pair<Interface_method_thunks::iterator, bool> ins = | |
11944 | Interface_field_reference_expression::interface_method_thunks.insert(val); | |
11945 | if (ins.second) | |
11946 | { | |
11947 | // This is the first time we have seen this interface. | |
11948 | ins.first->second = new Method_thunks(); | |
11949 | } | |
11950 | ||
11951 | for (Method_thunks::const_iterator p = ins.first->second->begin(); | |
11952 | p != ins.first->second->end(); | |
11953 | p++) | |
11954 | if (p->first == name) | |
11955 | return p->second; | |
11956 | ||
11957 | Location loc = type->location(); | |
11958 | ||
11959 | const Typed_identifier* method_id = type->find_method(name); | |
11960 | if (method_id == NULL) | |
11961 | return Named_object::make_erroneous_name(Gogo::thunk_name()); | |
11962 | ||
11963 | Function_type* orig_fntype = method_id->type()->function_type(); | |
11964 | if (orig_fntype == NULL) | |
11965 | return Named_object::make_erroneous_name(Gogo::thunk_name()); | |
11966 | ||
11967 | Struct_field_list* sfl = new Struct_field_list(); | |
f8bdf81a | 11968 | // The type here is wrong--it should be the C function type. But it |
11969 | // doesn't really matter. | |
0afbb937 | 11970 | Type* vt = Type::make_pointer_type(Type::make_void_type()); |
11971 | sfl->push_back(Struct_field(Typed_identifier("fn.0", vt, loc))); | |
11972 | sfl->push_back(Struct_field(Typed_identifier("val.1", type, loc))); | |
6bf4793c | 11973 | Struct_type* st = Type::make_struct_type(sfl, loc); |
11974 | st->set_is_struct_incomparable(); | |
11975 | Type* closure_type = Type::make_pointer_type(st); | |
0afbb937 | 11976 | |
f8bdf81a | 11977 | Function_type* new_fntype = orig_fntype->copy_with_names(); |
0afbb937 | 11978 | |
da244e59 | 11979 | std::string thunk_name = Gogo::thunk_name(); |
11980 | Named_object* new_no = gogo->start_function(thunk_name, new_fntype, | |
0afbb937 | 11981 | false, loc); |
11982 | ||
f8bdf81a | 11983 | Variable* cvar = new Variable(closure_type, NULL, false, false, false, loc); |
11984 | cvar->set_is_used(); | |
1ecc6157 | 11985 | cvar->set_is_closure(); |
da244e59 | 11986 | Named_object* cp = Named_object::make_variable("$closure" + thunk_name, |
11987 | NULL, cvar); | |
f8bdf81a | 11988 | new_no->func_value()->set_closure_var(cp); |
0afbb937 | 11989 | |
f8bdf81a | 11990 | gogo->start_block(loc); |
0afbb937 | 11991 | |
11992 | // Field 0 of the closure is the function code pointer, field 1 is | |
11993 | // the value on which to invoke the method. | |
11994 | Expression* arg = Expression::make_var_reference(cp, loc); | |
11995 | arg = Expression::make_unary(OPERATOR_MULT, arg, loc); | |
11996 | arg = Expression::make_field_reference(arg, 1, loc); | |
11997 | ||
11998 | Expression *ifre = Expression::make_interface_field_reference(arg, name, | |
11999 | loc); | |
12000 | ||
12001 | const Typed_identifier_list* orig_params = orig_fntype->parameters(); | |
12002 | Expression_list* args; | |
12003 | if (orig_params == NULL || orig_params->empty()) | |
12004 | args = NULL; | |
12005 | else | |
12006 | { | |
12007 | const Typed_identifier_list* new_params = new_fntype->parameters(); | |
12008 | args = new Expression_list(); | |
12009 | for (Typed_identifier_list::const_iterator p = new_params->begin(); | |
f8bdf81a | 12010 | p != new_params->end(); |
0afbb937 | 12011 | ++p) |
12012 | { | |
12013 | Named_object* p_no = gogo->lookup(p->name(), NULL); | |
12014 | go_assert(p_no != NULL | |
12015 | && p_no->is_variable() | |
12016 | && p_no->var_value()->is_parameter()); | |
12017 | args->push_back(Expression::make_var_reference(p_no, loc)); | |
12018 | } | |
12019 | } | |
12020 | ||
12021 | Call_expression* call = Expression::make_call(ifre, args, | |
12022 | orig_fntype->is_varargs(), | |
12023 | loc); | |
12024 | call->set_varargs_are_lowered(); | |
12025 | ||
12026 | Statement* s = Statement::make_return_from_call(call, loc); | |
12027 | gogo->add_statement(s); | |
12028 | Block* b = gogo->finish_block(loc); | |
12029 | gogo->add_block(b, loc); | |
12030 | gogo->lower_block(new_no, b); | |
a32698ee | 12031 | gogo->flatten_block(new_no, b); |
0afbb937 | 12032 | gogo->finish_function(loc); |
12033 | ||
12034 | ins.first->second->push_back(std::make_pair(name, new_no)); | |
12035 | return new_no; | |
12036 | } | |
12037 | ||
ea664253 | 12038 | // Get the backend representation for a method value. |
e440a328 | 12039 | |
ea664253 | 12040 | Bexpression* |
12041 | Interface_field_reference_expression::do_get_backend(Translate_context* context) | |
e440a328 | 12042 | { |
0afbb937 | 12043 | Interface_type* type = this->expr_->type()->interface_type(); |
12044 | if (type == NULL) | |
12045 | { | |
12046 | go_assert(saw_errors()); | |
ea664253 | 12047 | return context->backend()->error_expression(); |
0afbb937 | 12048 | } |
12049 | ||
12050 | Named_object* thunk = | |
12051 | Interface_field_reference_expression::create_thunk(context->gogo(), | |
12052 | type, this->name_); | |
12053 | if (thunk->is_erroneous()) | |
12054 | { | |
12055 | go_assert(saw_errors()); | |
ea664253 | 12056 | return context->backend()->error_expression(); |
0afbb937 | 12057 | } |
12058 | ||
12059 | // FIXME: We should lower this earlier, but we can't it lower it in | |
12060 | // the lowering pass because at that point we don't know whether we | |
12061 | // need to create the thunk or not. If the expression is called, we | |
12062 | // don't need the thunk. | |
12063 | ||
12064 | Location loc = this->location(); | |
12065 | ||
12066 | Struct_field_list* fields = new Struct_field_list(); | |
12067 | fields->push_back(Struct_field(Typed_identifier("fn.0", | |
12068 | thunk->func_value()->type(), | |
12069 | loc))); | |
12070 | fields->push_back(Struct_field(Typed_identifier("val.1", | |
12071 | this->expr_->type(), | |
12072 | loc))); | |
12073 | Struct_type* st = Type::make_struct_type(fields, loc); | |
6bf4793c | 12074 | st->set_is_struct_incomparable(); |
0afbb937 | 12075 | |
12076 | Expression_list* vals = new Expression_list(); | |
12077 | vals->push_back(Expression::make_func_code_reference(thunk, loc)); | |
12078 | vals->push_back(this->expr_); | |
12079 | ||
12080 | Expression* expr = Expression::make_struct_composite_literal(st, vals, loc); | |
ea664253 | 12081 | Bexpression* bclosure = |
12082 | Expression::make_heap_expression(expr, loc)->get_backend(context); | |
0afbb937 | 12083 | |
2387f644 | 12084 | Expression* nil_check = |
12085 | Expression::make_binary(OPERATOR_EQEQ, this->expr_, | |
12086 | Expression::make_nil(loc), loc); | |
ea664253 | 12087 | Bexpression* bnil_check = nil_check->get_backend(context); |
0afbb937 | 12088 | |
2387f644 | 12089 | Gogo* gogo = context->gogo(); |
ea664253 | 12090 | Bexpression* bcrash = gogo->runtime_error(RUNTIME_ERROR_NIL_DEREFERENCE, |
12091 | loc)->get_backend(context); | |
2387f644 | 12092 | |
93715b75 | 12093 | Bfunction* bfn = context->function()->func_value()->get_decl(); |
2387f644 | 12094 | Bexpression* bcond = |
93715b75 | 12095 | gogo->backend()->conditional_expression(bfn, NULL, |
12096 | bnil_check, bcrash, NULL, loc); | |
0ab48656 | 12097 | Bfunction* bfunction = context->function()->func_value()->get_decl(); |
12098 | Bstatement* cond_statement = | |
12099 | gogo->backend()->expression_statement(bfunction, bcond); | |
ea664253 | 12100 | return gogo->backend()->compound_expression(cond_statement, bclosure, loc); |
e440a328 | 12101 | } |
12102 | ||
d751bb78 | 12103 | // Dump ast representation for an interface field reference. |
12104 | ||
12105 | void | |
12106 | Interface_field_reference_expression::do_dump_expression( | |
12107 | Ast_dump_context* ast_dump_context) const | |
12108 | { | |
12109 | this->expr_->dump_expression(ast_dump_context); | |
12110 | ast_dump_context->ostream() << "." << this->name_; | |
12111 | } | |
12112 | ||
e440a328 | 12113 | // Make a reference to a field in an interface. |
12114 | ||
12115 | Expression* | |
12116 | Expression::make_interface_field_reference(Expression* expr, | |
12117 | const std::string& field, | |
b13c66cd | 12118 | Location location) |
e440a328 | 12119 | { |
12120 | return new Interface_field_reference_expression(expr, field, location); | |
12121 | } | |
12122 | ||
12123 | // A general selector. This is a Parser_expression for LEFT.NAME. It | |
12124 | // is lowered after we know the type of the left hand side. | |
12125 | ||
12126 | class Selector_expression : public Parser_expression | |
12127 | { | |
12128 | public: | |
12129 | Selector_expression(Expression* left, const std::string& name, | |
b13c66cd | 12130 | Location location) |
e440a328 | 12131 | : Parser_expression(EXPRESSION_SELECTOR, location), |
12132 | left_(left), name_(name) | |
12133 | { } | |
12134 | ||
12135 | protected: | |
12136 | int | |
12137 | do_traverse(Traverse* traverse) | |
12138 | { return Expression::traverse(&this->left_, traverse); } | |
12139 | ||
12140 | Expression* | |
ceeb4318 | 12141 | do_lower(Gogo*, Named_object*, Statement_inserter*, int); |
e440a328 | 12142 | |
12143 | Expression* | |
12144 | do_copy() | |
12145 | { | |
12146 | return new Selector_expression(this->left_->copy(), this->name_, | |
12147 | this->location()); | |
12148 | } | |
12149 | ||
d751bb78 | 12150 | void |
12151 | do_dump_expression(Ast_dump_context* ast_dump_context) const; | |
12152 | ||
e440a328 | 12153 | private: |
12154 | Expression* | |
12155 | lower_method_expression(Gogo*); | |
12156 | ||
12157 | // The expression on the left hand side. | |
12158 | Expression* left_; | |
12159 | // The name on the right hand side. | |
12160 | std::string name_; | |
12161 | }; | |
12162 | ||
12163 | // Lower a selector expression once we know the real type of the left | |
12164 | // hand side. | |
12165 | ||
12166 | Expression* | |
ceeb4318 | 12167 | Selector_expression::do_lower(Gogo* gogo, Named_object*, Statement_inserter*, |
12168 | int) | |
e440a328 | 12169 | { |
12170 | Expression* left = this->left_; | |
12171 | if (left->is_type_expression()) | |
12172 | return this->lower_method_expression(gogo); | |
12173 | return Type::bind_field_or_method(gogo, left->type(), left, this->name_, | |
12174 | this->location()); | |
12175 | } | |
12176 | ||
12177 | // Lower a method expression T.M or (*T).M. We turn this into a | |
12178 | // function literal. | |
12179 | ||
12180 | Expression* | |
12181 | Selector_expression::lower_method_expression(Gogo* gogo) | |
12182 | { | |
b13c66cd | 12183 | Location location = this->location(); |
868b439e | 12184 | Type* left_type = this->left_->type(); |
12185 | Type* type = left_type; | |
e440a328 | 12186 | const std::string& name(this->name_); |
12187 | ||
12188 | bool is_pointer; | |
12189 | if (type->points_to() == NULL) | |
12190 | is_pointer = false; | |
12191 | else | |
12192 | { | |
12193 | is_pointer = true; | |
12194 | type = type->points_to(); | |
12195 | } | |
12196 | Named_type* nt = type->named_type(); | |
12197 | if (nt == NULL) | |
12198 | { | |
631d5788 | 12199 | go_error_at(location, |
12200 | ("method expression requires named type or " | |
12201 | "pointer to named type")); | |
e440a328 | 12202 | return Expression::make_error(location); |
12203 | } | |
12204 | ||
12205 | bool is_ambiguous; | |
12206 | Method* method = nt->method_function(name, &is_ambiguous); | |
ab1468c3 | 12207 | const Typed_identifier* imethod = NULL; |
dcc8506b | 12208 | if (method == NULL && !is_pointer) |
ab1468c3 | 12209 | { |
12210 | Interface_type* it = nt->interface_type(); | |
12211 | if (it != NULL) | |
12212 | imethod = it->find_method(name); | |
12213 | } | |
12214 | ||
868b439e | 12215 | if ((method == NULL && imethod == NULL) |
12216 | || (left_type->named_type() != NULL && left_type->points_to() != NULL)) | |
e440a328 | 12217 | { |
12218 | if (!is_ambiguous) | |
631d5788 | 12219 | go_error_at(location, "type %<%s%s%> has no method %<%s%>", |
12220 | is_pointer ? "*" : "", | |
12221 | nt->message_name().c_str(), | |
12222 | Gogo::message_name(name).c_str()); | |
e440a328 | 12223 | else |
631d5788 | 12224 | go_error_at(location, "method %<%s%s%> is ambiguous in type %<%s%>", |
12225 | Gogo::message_name(name).c_str(), | |
12226 | is_pointer ? "*" : "", | |
12227 | nt->message_name().c_str()); | |
e440a328 | 12228 | return Expression::make_error(location); |
12229 | } | |
12230 | ||
ab1468c3 | 12231 | if (method != NULL && !is_pointer && !method->is_value_method()) |
e440a328 | 12232 | { |
631d5788 | 12233 | go_error_at(location, "method requires pointer (use %<(*%s).%s%>)", |
12234 | nt->message_name().c_str(), | |
12235 | Gogo::message_name(name).c_str()); | |
e440a328 | 12236 | return Expression::make_error(location); |
12237 | } | |
12238 | ||
12239 | // Build a new function type in which the receiver becomes the first | |
12240 | // argument. | |
ab1468c3 | 12241 | Function_type* method_type; |
12242 | if (method != NULL) | |
12243 | { | |
12244 | method_type = method->type(); | |
c484d925 | 12245 | go_assert(method_type->is_method()); |
ab1468c3 | 12246 | } |
12247 | else | |
12248 | { | |
12249 | method_type = imethod->type()->function_type(); | |
c484d925 | 12250 | go_assert(method_type != NULL && !method_type->is_method()); |
ab1468c3 | 12251 | } |
e440a328 | 12252 | |
12253 | const char* const receiver_name = "$this"; | |
12254 | Typed_identifier_list* parameters = new Typed_identifier_list(); | |
12255 | parameters->push_back(Typed_identifier(receiver_name, this->left_->type(), | |
12256 | location)); | |
12257 | ||
12258 | const Typed_identifier_list* method_parameters = method_type->parameters(); | |
12259 | if (method_parameters != NULL) | |
12260 | { | |
f470da59 | 12261 | int i = 0; |
e440a328 | 12262 | for (Typed_identifier_list::const_iterator p = method_parameters->begin(); |
12263 | p != method_parameters->end(); | |
f470da59 | 12264 | ++p, ++i) |
12265 | { | |
68883531 | 12266 | if (!p->name().empty()) |
f470da59 | 12267 | parameters->push_back(*p); |
12268 | else | |
12269 | { | |
12270 | char buf[20]; | |
12271 | snprintf(buf, sizeof buf, "$param%d", i); | |
12272 | parameters->push_back(Typed_identifier(buf, p->type(), | |
12273 | p->location())); | |
12274 | } | |
12275 | } | |
e440a328 | 12276 | } |
12277 | ||
12278 | const Typed_identifier_list* method_results = method_type->results(); | |
12279 | Typed_identifier_list* results; | |
12280 | if (method_results == NULL) | |
12281 | results = NULL; | |
12282 | else | |
12283 | { | |
12284 | results = new Typed_identifier_list(); | |
12285 | for (Typed_identifier_list::const_iterator p = method_results->begin(); | |
12286 | p != method_results->end(); | |
12287 | ++p) | |
12288 | results->push_back(*p); | |
12289 | } | |
12290 | ||
12291 | Function_type* fntype = Type::make_function_type(NULL, parameters, results, | |
12292 | location); | |
12293 | if (method_type->is_varargs()) | |
12294 | fntype->set_is_varargs(); | |
12295 | ||
12296 | // We generate methods which always takes a pointer to the receiver | |
12297 | // as their first argument. If this is for a pointer type, we can | |
12298 | // simply reuse the existing function. We use an internal hack to | |
12299 | // get the right type. | |
8381eda7 | 12300 | // FIXME: This optimization is disabled because it doesn't yet work |
12301 | // with function descriptors when the method expression is not | |
12302 | // directly called. | |
12303 | if (method != NULL && is_pointer && false) | |
e440a328 | 12304 | { |
12305 | Named_object* mno = (method->needs_stub_method() | |
12306 | ? method->stub_object() | |
12307 | : method->named_object()); | |
12308 | Expression* f = Expression::make_func_reference(mno, NULL, location); | |
12309 | f = Expression::make_cast(fntype, f, location); | |
12310 | Type_conversion_expression* tce = | |
12311 | static_cast<Type_conversion_expression*>(f); | |
12312 | tce->set_may_convert_function_types(); | |
12313 | return f; | |
12314 | } | |
12315 | ||
12316 | Named_object* no = gogo->start_function(Gogo::thunk_name(), fntype, false, | |
12317 | location); | |
12318 | ||
12319 | Named_object* vno = gogo->lookup(receiver_name, NULL); | |
c484d925 | 12320 | go_assert(vno != NULL); |
e440a328 | 12321 | Expression* ve = Expression::make_var_reference(vno, location); |
ab1468c3 | 12322 | Expression* bm; |
12323 | if (method != NULL) | |
12324 | bm = Type::bind_field_or_method(gogo, nt, ve, name, location); | |
12325 | else | |
12326 | bm = Expression::make_interface_field_reference(ve, name, location); | |
f690b0bb | 12327 | |
12328 | // Even though we found the method above, if it has an error type we | |
12329 | // may see an error here. | |
12330 | if (bm->is_error_expression()) | |
463fe805 | 12331 | { |
12332 | gogo->finish_function(location); | |
12333 | return bm; | |
12334 | } | |
e440a328 | 12335 | |
12336 | Expression_list* args; | |
f470da59 | 12337 | if (parameters->size() <= 1) |
e440a328 | 12338 | args = NULL; |
12339 | else | |
12340 | { | |
12341 | args = new Expression_list(); | |
f470da59 | 12342 | Typed_identifier_list::const_iterator p = parameters->begin(); |
12343 | ++p; | |
12344 | for (; p != parameters->end(); ++p) | |
e440a328 | 12345 | { |
12346 | vno = gogo->lookup(p->name(), NULL); | |
c484d925 | 12347 | go_assert(vno != NULL); |
e440a328 | 12348 | args->push_back(Expression::make_var_reference(vno, location)); |
12349 | } | |
12350 | } | |
12351 | ||
ceeb4318 | 12352 | gogo->start_block(location); |
12353 | ||
e440a328 | 12354 | Call_expression* call = Expression::make_call(bm, args, |
12355 | method_type->is_varargs(), | |
12356 | location); | |
12357 | ||
0afbb937 | 12358 | Statement* s = Statement::make_return_from_call(call, location); |
e440a328 | 12359 | gogo->add_statement(s); |
12360 | ||
ceeb4318 | 12361 | Block* b = gogo->finish_block(location); |
12362 | ||
12363 | gogo->add_block(b, location); | |
12364 | ||
12365 | // Lower the call in case there are multiple results. | |
12366 | gogo->lower_block(no, b); | |
a32698ee | 12367 | gogo->flatten_block(no, b); |
ceeb4318 | 12368 | |
e440a328 | 12369 | gogo->finish_function(location); |
12370 | ||
12371 | return Expression::make_func_reference(no, NULL, location); | |
12372 | } | |
12373 | ||
d751bb78 | 12374 | // Dump the ast for a selector expression. |
12375 | ||
12376 | void | |
12377 | Selector_expression::do_dump_expression(Ast_dump_context* ast_dump_context) | |
12378 | const | |
12379 | { | |
12380 | ast_dump_context->dump_expression(this->left_); | |
12381 | ast_dump_context->ostream() << "."; | |
12382 | ast_dump_context->ostream() << this->name_; | |
12383 | } | |
12384 | ||
e440a328 | 12385 | // Make a selector expression. |
12386 | ||
12387 | Expression* | |
12388 | Expression::make_selector(Expression* left, const std::string& name, | |
b13c66cd | 12389 | Location location) |
e440a328 | 12390 | { |
12391 | return new Selector_expression(left, name, location); | |
12392 | } | |
12393 | ||
da244e59 | 12394 | // Class Allocation_expression. |
e440a328 | 12395 | |
da244e59 | 12396 | int |
12397 | Allocation_expression::do_traverse(Traverse* traverse) | |
e440a328 | 12398 | { |
da244e59 | 12399 | return Type::traverse(this->type_, traverse); |
12400 | } | |
e440a328 | 12401 | |
da244e59 | 12402 | Type* |
12403 | Allocation_expression::do_type() | |
12404 | { | |
12405 | return Type::make_pointer_type(this->type_); | |
12406 | } | |
e440a328 | 12407 | |
da244e59 | 12408 | // Make a copy of an allocation expression. |
e440a328 | 12409 | |
da244e59 | 12410 | Expression* |
12411 | Allocation_expression::do_copy() | |
12412 | { | |
12413 | Allocation_expression* alloc = | |
12414 | new Allocation_expression(this->type_, this->location()); | |
12415 | if (this->allocate_on_stack_) | |
12416 | alloc->set_allocate_on_stack(); | |
12417 | return alloc; | |
12418 | } | |
e440a328 | 12419 | |
ea664253 | 12420 | // Return the backend representation for an allocation expression. |
e440a328 | 12421 | |
ea664253 | 12422 | Bexpression* |
12423 | Allocation_expression::do_get_backend(Translate_context* context) | |
e440a328 | 12424 | { |
2c809f8f | 12425 | Gogo* gogo = context->gogo(); |
12426 | Location loc = this->location(); | |
da244e59 | 12427 | |
45ff893b | 12428 | Node* n = Node::make_node(this); |
12429 | if (this->allocate_on_stack_ | |
12430 | || (n->encoding() & ESCAPE_MASK) == int(Node::ESCAPE_NONE)) | |
da244e59 | 12431 | { |
2a305b85 | 12432 | int64_t size; |
12433 | bool ok = this->type_->backend_type_size(gogo, &size); | |
12434 | if (!ok) | |
12435 | { | |
12436 | go_assert(saw_errors()); | |
12437 | return gogo->backend()->error_expression(); | |
12438 | } | |
d5d1c295 | 12439 | return gogo->backend()->stack_allocation_expression(size, loc); |
da244e59 | 12440 | } |
12441 | ||
2a305b85 | 12442 | Btype* btype = this->type_->get_backend(gogo); |
12443 | Bexpression* space = | |
ea664253 | 12444 | gogo->allocate_memory(this->type_, loc)->get_backend(context); |
d5d1c295 | 12445 | Btype* pbtype = gogo->backend()->pointer_type(btype); |
ea664253 | 12446 | return gogo->backend()->convert_expression(pbtype, space, loc); |
e440a328 | 12447 | } |
12448 | ||
d751bb78 | 12449 | // Dump ast representation for an allocation expression. |
12450 | ||
12451 | void | |
12452 | Allocation_expression::do_dump_expression(Ast_dump_context* ast_dump_context) | |
12453 | const | |
12454 | { | |
12455 | ast_dump_context->ostream() << "new("; | |
12456 | ast_dump_context->dump_type(this->type_); | |
12457 | ast_dump_context->ostream() << ")"; | |
12458 | } | |
12459 | ||
e440a328 | 12460 | // Make an allocation expression. |
12461 | ||
12462 | Expression* | |
b13c66cd | 12463 | Expression::make_allocation(Type* type, Location location) |
e440a328 | 12464 | { |
12465 | return new Allocation_expression(type, location); | |
12466 | } | |
12467 | ||
e32de7ba | 12468 | // Class Ordered_value_list. |
e440a328 | 12469 | |
12470 | int | |
e32de7ba | 12471 | Ordered_value_list::traverse_vals(Traverse* traverse) |
e440a328 | 12472 | { |
0c4f5a19 | 12473 | if (this->vals_ != NULL) |
12474 | { | |
12475 | if (this->traverse_order_ == NULL) | |
12476 | { | |
12477 | if (this->vals_->traverse(traverse) == TRAVERSE_EXIT) | |
12478 | return TRAVERSE_EXIT; | |
12479 | } | |
12480 | else | |
12481 | { | |
e32de7ba | 12482 | for (std::vector<unsigned long>::const_iterator p = |
12483 | this->traverse_order_->begin(); | |
0c4f5a19 | 12484 | p != this->traverse_order_->end(); |
12485 | ++p) | |
12486 | { | |
12487 | if (Expression::traverse(&this->vals_->at(*p), traverse) | |
12488 | == TRAVERSE_EXIT) | |
12489 | return TRAVERSE_EXIT; | |
12490 | } | |
12491 | } | |
12492 | } | |
e32de7ba | 12493 | return TRAVERSE_CONTINUE; |
12494 | } | |
12495 | ||
12496 | // Class Struct_construction_expression. | |
12497 | ||
12498 | // Traversal. | |
12499 | ||
12500 | int | |
12501 | Struct_construction_expression::do_traverse(Traverse* traverse) | |
12502 | { | |
12503 | if (this->traverse_vals(traverse) == TRAVERSE_EXIT) | |
12504 | return TRAVERSE_EXIT; | |
e440a328 | 12505 | if (Type::traverse(this->type_, traverse) == TRAVERSE_EXIT) |
12506 | return TRAVERSE_EXIT; | |
12507 | return TRAVERSE_CONTINUE; | |
12508 | } | |
12509 | ||
12510 | // Return whether this is a constant initializer. | |
12511 | ||
12512 | bool | |
12513 | Struct_construction_expression::is_constant_struct() const | |
12514 | { | |
e32de7ba | 12515 | if (this->vals() == NULL) |
e440a328 | 12516 | return true; |
e32de7ba | 12517 | for (Expression_list::const_iterator pv = this->vals()->begin(); |
12518 | pv != this->vals()->end(); | |
e440a328 | 12519 | ++pv) |
12520 | { | |
12521 | if (*pv != NULL | |
12522 | && !(*pv)->is_constant() | |
12523 | && (!(*pv)->is_composite_literal() | |
12524 | || (*pv)->is_nonconstant_composite_literal())) | |
12525 | return false; | |
12526 | } | |
12527 | ||
12528 | const Struct_field_list* fields = this->type_->struct_type()->fields(); | |
12529 | for (Struct_field_list::const_iterator pf = fields->begin(); | |
12530 | pf != fields->end(); | |
12531 | ++pf) | |
12532 | { | |
12533 | // There are no constant constructors for interfaces. | |
12534 | if (pf->type()->interface_type() != NULL) | |
12535 | return false; | |
12536 | } | |
12537 | ||
12538 | return true; | |
12539 | } | |
12540 | ||
3ae06f68 | 12541 | // Return whether this struct can be used as a constant initializer. |
f9ca30f9 | 12542 | |
12543 | bool | |
3ae06f68 | 12544 | Struct_construction_expression::do_is_static_initializer() const |
f9ca30f9 | 12545 | { |
e32de7ba | 12546 | if (this->vals() == NULL) |
f9ca30f9 | 12547 | return true; |
e32de7ba | 12548 | for (Expression_list::const_iterator pv = this->vals()->begin(); |
12549 | pv != this->vals()->end(); | |
f9ca30f9 | 12550 | ++pv) |
12551 | { | |
3ae06f68 | 12552 | if (*pv != NULL && !(*pv)->is_static_initializer()) |
f9ca30f9 | 12553 | return false; |
12554 | } | |
de048538 | 12555 | |
12556 | const Struct_field_list* fields = this->type_->struct_type()->fields(); | |
12557 | for (Struct_field_list::const_iterator pf = fields->begin(); | |
12558 | pf != fields->end(); | |
12559 | ++pf) | |
12560 | { | |
12561 | // There are no constant constructors for interfaces. | |
12562 | if (pf->type()->interface_type() != NULL) | |
12563 | return false; | |
12564 | } | |
12565 | ||
f9ca30f9 | 12566 | return true; |
12567 | } | |
12568 | ||
e440a328 | 12569 | // Final type determination. |
12570 | ||
12571 | void | |
12572 | Struct_construction_expression::do_determine_type(const Type_context*) | |
12573 | { | |
e32de7ba | 12574 | if (this->vals() == NULL) |
e440a328 | 12575 | return; |
12576 | const Struct_field_list* fields = this->type_->struct_type()->fields(); | |
e32de7ba | 12577 | Expression_list::const_iterator pv = this->vals()->begin(); |
e440a328 | 12578 | for (Struct_field_list::const_iterator pf = fields->begin(); |
12579 | pf != fields->end(); | |
12580 | ++pf, ++pv) | |
12581 | { | |
e32de7ba | 12582 | if (pv == this->vals()->end()) |
e440a328 | 12583 | return; |
12584 | if (*pv != NULL) | |
12585 | { | |
12586 | Type_context subcontext(pf->type(), false); | |
12587 | (*pv)->determine_type(&subcontext); | |
12588 | } | |
12589 | } | |
a6cb4c0e | 12590 | // Extra values are an error we will report elsewhere; we still want |
12591 | // to determine the type to avoid knockon errors. | |
e32de7ba | 12592 | for (; pv != this->vals()->end(); ++pv) |
a6cb4c0e | 12593 | (*pv)->determine_type_no_context(); |
e440a328 | 12594 | } |
12595 | ||
12596 | // Check types. | |
12597 | ||
12598 | void | |
12599 | Struct_construction_expression::do_check_types(Gogo*) | |
12600 | { | |
e32de7ba | 12601 | if (this->vals() == NULL) |
e440a328 | 12602 | return; |
12603 | ||
12604 | Struct_type* st = this->type_->struct_type(); | |
e32de7ba | 12605 | if (this->vals()->size() > st->field_count()) |
e440a328 | 12606 | { |
12607 | this->report_error(_("too many expressions for struct")); | |
12608 | return; | |
12609 | } | |
12610 | ||
12611 | const Struct_field_list* fields = st->fields(); | |
e32de7ba | 12612 | Expression_list::const_iterator pv = this->vals()->begin(); |
e440a328 | 12613 | int i = 0; |
12614 | for (Struct_field_list::const_iterator pf = fields->begin(); | |
12615 | pf != fields->end(); | |
12616 | ++pf, ++pv, ++i) | |
12617 | { | |
e32de7ba | 12618 | if (pv == this->vals()->end()) |
e440a328 | 12619 | { |
12620 | this->report_error(_("too few expressions for struct")); | |
12621 | break; | |
12622 | } | |
12623 | ||
12624 | if (*pv == NULL) | |
12625 | continue; | |
12626 | ||
12627 | std::string reason; | |
12628 | if (!Type::are_assignable(pf->type(), (*pv)->type(), &reason)) | |
12629 | { | |
12630 | if (reason.empty()) | |
631d5788 | 12631 | go_error_at((*pv)->location(), |
12632 | "incompatible type for field %d in struct construction", | |
12633 | i + 1); | |
e440a328 | 12634 | else |
631d5788 | 12635 | go_error_at((*pv)->location(), |
12636 | ("incompatible type for field %d in " | |
12637 | "struct construction (%s)"), | |
12638 | i + 1, reason.c_str()); | |
e440a328 | 12639 | this->set_is_error(); |
12640 | } | |
12641 | } | |
e32de7ba | 12642 | go_assert(pv == this->vals()->end()); |
e440a328 | 12643 | } |
12644 | ||
8ba8cc87 | 12645 | // Flatten a struct construction expression. Store the values into |
12646 | // temporaries in case they need interface conversion. | |
12647 | ||
12648 | Expression* | |
12649 | Struct_construction_expression::do_flatten(Gogo*, Named_object*, | |
12650 | Statement_inserter* inserter) | |
12651 | { | |
e32de7ba | 12652 | if (this->vals() == NULL) |
8ba8cc87 | 12653 | return this; |
12654 | ||
12655 | // If this is a constant struct, we don't need temporaries. | |
de048538 | 12656 | if (this->is_constant_struct() || this->is_static_initializer()) |
8ba8cc87 | 12657 | return this; |
12658 | ||
12659 | Location loc = this->location(); | |
e32de7ba | 12660 | for (Expression_list::iterator pv = this->vals()->begin(); |
12661 | pv != this->vals()->end(); | |
8ba8cc87 | 12662 | ++pv) |
12663 | { | |
12664 | if (*pv != NULL) | |
12665 | { | |
5bf8be8b | 12666 | if ((*pv)->is_error_expression() || (*pv)->type()->is_error_type()) |
12667 | { | |
12668 | go_assert(saw_errors()); | |
12669 | return Expression::make_error(loc); | |
12670 | } | |
8ba8cc87 | 12671 | if (!(*pv)->is_variable()) |
12672 | { | |
12673 | Temporary_statement* temp = | |
12674 | Statement::make_temporary(NULL, *pv, loc); | |
12675 | inserter->insert(temp); | |
12676 | *pv = Expression::make_temporary_reference(temp, loc); | |
12677 | } | |
12678 | } | |
12679 | } | |
12680 | return this; | |
12681 | } | |
12682 | ||
ea664253 | 12683 | // Return the backend representation for constructing a struct. |
e440a328 | 12684 | |
ea664253 | 12685 | Bexpression* |
12686 | Struct_construction_expression::do_get_backend(Translate_context* context) | |
e440a328 | 12687 | { |
12688 | Gogo* gogo = context->gogo(); | |
12689 | ||
2c809f8f | 12690 | Btype* btype = this->type_->get_backend(gogo); |
e32de7ba | 12691 | if (this->vals() == NULL) |
ea664253 | 12692 | return gogo->backend()->zero_expression(btype); |
e440a328 | 12693 | |
e440a328 | 12694 | const Struct_field_list* fields = this->type_->struct_type()->fields(); |
e32de7ba | 12695 | Expression_list::const_iterator pv = this->vals()->begin(); |
2c809f8f | 12696 | std::vector<Bexpression*> init; |
12697 | for (Struct_field_list::const_iterator pf = fields->begin(); | |
12698 | pf != fields->end(); | |
12699 | ++pf) | |
e440a328 | 12700 | { |
63697958 | 12701 | Btype* fbtype = pf->type()->get_backend(gogo); |
e32de7ba | 12702 | if (pv == this->vals()->end()) |
2c809f8f | 12703 | init.push_back(gogo->backend()->zero_expression(fbtype)); |
e440a328 | 12704 | else if (*pv == NULL) |
12705 | { | |
2c809f8f | 12706 | init.push_back(gogo->backend()->zero_expression(fbtype)); |
e440a328 | 12707 | ++pv; |
12708 | } | |
12709 | else | |
12710 | { | |
2c809f8f | 12711 | Expression* val = |
12712 | Expression::convert_for_assignment(gogo, pf->type(), | |
12713 | *pv, this->location()); | |
ea664253 | 12714 | init.push_back(val->get_backend(context)); |
e440a328 | 12715 | ++pv; |
12716 | } | |
e440a328 | 12717 | } |
ea664253 | 12718 | return gogo->backend()->constructor_expression(btype, init, this->location()); |
e440a328 | 12719 | } |
12720 | ||
12721 | // Export a struct construction. | |
12722 | ||
12723 | void | |
12724 | Struct_construction_expression::do_export(Export* exp) const | |
12725 | { | |
12726 | exp->write_c_string("convert("); | |
12727 | exp->write_type(this->type_); | |
e32de7ba | 12728 | for (Expression_list::const_iterator pv = this->vals()->begin(); |
12729 | pv != this->vals()->end(); | |
e440a328 | 12730 | ++pv) |
12731 | { | |
12732 | exp->write_c_string(", "); | |
12733 | if (*pv != NULL) | |
12734 | (*pv)->export_expression(exp); | |
12735 | } | |
12736 | exp->write_c_string(")"); | |
12737 | } | |
12738 | ||
d751bb78 | 12739 | // Dump ast representation of a struct construction expression. |
12740 | ||
12741 | void | |
12742 | Struct_construction_expression::do_dump_expression( | |
12743 | Ast_dump_context* ast_dump_context) const | |
12744 | { | |
d751bb78 | 12745 | ast_dump_context->dump_type(this->type_); |
12746 | ast_dump_context->ostream() << "{"; | |
e32de7ba | 12747 | ast_dump_context->dump_expression_list(this->vals()); |
d751bb78 | 12748 | ast_dump_context->ostream() << "}"; |
12749 | } | |
12750 | ||
e440a328 | 12751 | // Make a struct composite literal. This used by the thunk code. |
12752 | ||
12753 | Expression* | |
12754 | Expression::make_struct_composite_literal(Type* type, Expression_list* vals, | |
b13c66cd | 12755 | Location location) |
e440a328 | 12756 | { |
c484d925 | 12757 | go_assert(type->struct_type() != NULL); |
e440a328 | 12758 | return new Struct_construction_expression(type, vals, location); |
12759 | } | |
12760 | ||
da244e59 | 12761 | // Class Array_construction_expression. |
e440a328 | 12762 | |
12763 | // Traversal. | |
12764 | ||
12765 | int | |
12766 | Array_construction_expression::do_traverse(Traverse* traverse) | |
12767 | { | |
e32de7ba | 12768 | if (this->traverse_vals(traverse) == TRAVERSE_EXIT) |
e440a328 | 12769 | return TRAVERSE_EXIT; |
12770 | if (Type::traverse(this->type_, traverse) == TRAVERSE_EXIT) | |
12771 | return TRAVERSE_EXIT; | |
12772 | return TRAVERSE_CONTINUE; | |
12773 | } | |
12774 | ||
12775 | // Return whether this is a constant initializer. | |
12776 | ||
12777 | bool | |
12778 | Array_construction_expression::is_constant_array() const | |
12779 | { | |
e32de7ba | 12780 | if (this->vals() == NULL) |
e440a328 | 12781 | return true; |
12782 | ||
12783 | // There are no constant constructors for interfaces. | |
12784 | if (this->type_->array_type()->element_type()->interface_type() != NULL) | |
12785 | return false; | |
12786 | ||
e32de7ba | 12787 | for (Expression_list::const_iterator pv = this->vals()->begin(); |
12788 | pv != this->vals()->end(); | |
e440a328 | 12789 | ++pv) |
12790 | { | |
12791 | if (*pv != NULL | |
12792 | && !(*pv)->is_constant() | |
12793 | && (!(*pv)->is_composite_literal() | |
12794 | || (*pv)->is_nonconstant_composite_literal())) | |
12795 | return false; | |
12796 | } | |
12797 | return true; | |
12798 | } | |
12799 | ||
3ae06f68 | 12800 | // Return whether this can be used a constant initializer. |
f9ca30f9 | 12801 | |
12802 | bool | |
3ae06f68 | 12803 | Array_construction_expression::do_is_static_initializer() const |
f9ca30f9 | 12804 | { |
e32de7ba | 12805 | if (this->vals() == NULL) |
f9ca30f9 | 12806 | return true; |
de048538 | 12807 | |
12808 | // There are no constant constructors for interfaces. | |
12809 | if (this->type_->array_type()->element_type()->interface_type() != NULL) | |
12810 | return false; | |
12811 | ||
e32de7ba | 12812 | for (Expression_list::const_iterator pv = this->vals()->begin(); |
12813 | pv != this->vals()->end(); | |
f9ca30f9 | 12814 | ++pv) |
12815 | { | |
3ae06f68 | 12816 | if (*pv != NULL && !(*pv)->is_static_initializer()) |
f9ca30f9 | 12817 | return false; |
12818 | } | |
12819 | return true; | |
12820 | } | |
12821 | ||
e440a328 | 12822 | // Final type determination. |
12823 | ||
12824 | void | |
12825 | Array_construction_expression::do_determine_type(const Type_context*) | |
12826 | { | |
e32de7ba | 12827 | if (this->vals() == NULL) |
e440a328 | 12828 | return; |
12829 | Type_context subcontext(this->type_->array_type()->element_type(), false); | |
e32de7ba | 12830 | for (Expression_list::const_iterator pv = this->vals()->begin(); |
12831 | pv != this->vals()->end(); | |
e440a328 | 12832 | ++pv) |
12833 | { | |
12834 | if (*pv != NULL) | |
12835 | (*pv)->determine_type(&subcontext); | |
12836 | } | |
12837 | } | |
12838 | ||
12839 | // Check types. | |
12840 | ||
12841 | void | |
12842 | Array_construction_expression::do_check_types(Gogo*) | |
12843 | { | |
e32de7ba | 12844 | if (this->vals() == NULL) |
e440a328 | 12845 | return; |
12846 | ||
12847 | Array_type* at = this->type_->array_type(); | |
12848 | int i = 0; | |
12849 | Type* element_type = at->element_type(); | |
e32de7ba | 12850 | for (Expression_list::const_iterator pv = this->vals()->begin(); |
12851 | pv != this->vals()->end(); | |
e440a328 | 12852 | ++pv, ++i) |
12853 | { | |
12854 | if (*pv != NULL | |
12855 | && !Type::are_assignable(element_type, (*pv)->type(), NULL)) | |
12856 | { | |
631d5788 | 12857 | go_error_at((*pv)->location(), |
12858 | "incompatible type for element %d in composite literal", | |
12859 | i + 1); | |
e440a328 | 12860 | this->set_is_error(); |
12861 | } | |
12862 | } | |
e440a328 | 12863 | } |
12864 | ||
8ba8cc87 | 12865 | // Flatten an array construction expression. Store the values into |
12866 | // temporaries in case they need interface conversion. | |
12867 | ||
12868 | Expression* | |
12869 | Array_construction_expression::do_flatten(Gogo*, Named_object*, | |
12870 | Statement_inserter* inserter) | |
12871 | { | |
e32de7ba | 12872 | if (this->vals() == NULL) |
8ba8cc87 | 12873 | return this; |
12874 | ||
12875 | // If this is a constant array, we don't need temporaries. | |
de048538 | 12876 | if (this->is_constant_array() || this->is_static_initializer()) |
8ba8cc87 | 12877 | return this; |
12878 | ||
12879 | Location loc = this->location(); | |
e32de7ba | 12880 | for (Expression_list::iterator pv = this->vals()->begin(); |
12881 | pv != this->vals()->end(); | |
8ba8cc87 | 12882 | ++pv) |
12883 | { | |
12884 | if (*pv != NULL) | |
12885 | { | |
5bf8be8b | 12886 | if ((*pv)->is_error_expression() || (*pv)->type()->is_error_type()) |
12887 | { | |
12888 | go_assert(saw_errors()); | |
12889 | return Expression::make_error(loc); | |
12890 | } | |
8ba8cc87 | 12891 | if (!(*pv)->is_variable()) |
12892 | { | |
12893 | Temporary_statement* temp = | |
12894 | Statement::make_temporary(NULL, *pv, loc); | |
12895 | inserter->insert(temp); | |
12896 | *pv = Expression::make_temporary_reference(temp, loc); | |
12897 | } | |
12898 | } | |
12899 | } | |
12900 | return this; | |
12901 | } | |
12902 | ||
2c809f8f | 12903 | // Get a constructor expression for the array values. |
e440a328 | 12904 | |
2c809f8f | 12905 | Bexpression* |
12906 | Array_construction_expression::get_constructor(Translate_context* context, | |
12907 | Btype* array_btype) | |
e440a328 | 12908 | { |
e440a328 | 12909 | Type* element_type = this->type_->array_type()->element_type(); |
2c809f8f | 12910 | |
12911 | std::vector<unsigned long> indexes; | |
12912 | std::vector<Bexpression*> vals; | |
12913 | Gogo* gogo = context->gogo(); | |
e32de7ba | 12914 | if (this->vals() != NULL) |
e440a328 | 12915 | { |
12916 | size_t i = 0; | |
ffe743ca | 12917 | std::vector<unsigned long>::const_iterator pi; |
12918 | if (this->indexes_ != NULL) | |
12919 | pi = this->indexes_->begin(); | |
e32de7ba | 12920 | for (Expression_list::const_iterator pv = this->vals()->begin(); |
12921 | pv != this->vals()->end(); | |
e440a328 | 12922 | ++pv, ++i) |
12923 | { | |
ffe743ca | 12924 | if (this->indexes_ != NULL) |
12925 | go_assert(pi != this->indexes_->end()); | |
ffe743ca | 12926 | |
12927 | if (this->indexes_ == NULL) | |
2c809f8f | 12928 | indexes.push_back(i); |
ffe743ca | 12929 | else |
2c809f8f | 12930 | indexes.push_back(*pi); |
e440a328 | 12931 | if (*pv == NULL) |
63697958 | 12932 | { |
63697958 | 12933 | Btype* ebtype = element_type->get_backend(gogo); |
12934 | Bexpression *zv = gogo->backend()->zero_expression(ebtype); | |
2c809f8f | 12935 | vals.push_back(zv); |
63697958 | 12936 | } |
e440a328 | 12937 | else |
12938 | { | |
2c809f8f | 12939 | Expression* val_expr = |
12940 | Expression::convert_for_assignment(gogo, element_type, *pv, | |
12941 | this->location()); | |
ea664253 | 12942 | vals.push_back(val_expr->get_backend(context)); |
e440a328 | 12943 | } |
ffe743ca | 12944 | if (this->indexes_ != NULL) |
12945 | ++pi; | |
e440a328 | 12946 | } |
ffe743ca | 12947 | if (this->indexes_ != NULL) |
12948 | go_assert(pi == this->indexes_->end()); | |
e440a328 | 12949 | } |
2c809f8f | 12950 | return gogo->backend()->array_constructor_expression(array_btype, indexes, |
12951 | vals, this->location()); | |
e440a328 | 12952 | } |
12953 | ||
12954 | // Export an array construction. | |
12955 | ||
12956 | void | |
12957 | Array_construction_expression::do_export(Export* exp) const | |
12958 | { | |
12959 | exp->write_c_string("convert("); | |
12960 | exp->write_type(this->type_); | |
e32de7ba | 12961 | if (this->vals() != NULL) |
e440a328 | 12962 | { |
ffe743ca | 12963 | std::vector<unsigned long>::const_iterator pi; |
12964 | if (this->indexes_ != NULL) | |
12965 | pi = this->indexes_->begin(); | |
e32de7ba | 12966 | for (Expression_list::const_iterator pv = this->vals()->begin(); |
12967 | pv != this->vals()->end(); | |
e440a328 | 12968 | ++pv) |
12969 | { | |
12970 | exp->write_c_string(", "); | |
ffe743ca | 12971 | |
12972 | if (this->indexes_ != NULL) | |
12973 | { | |
12974 | char buf[100]; | |
12975 | snprintf(buf, sizeof buf, "%lu", *pi); | |
12976 | exp->write_c_string(buf); | |
12977 | exp->write_c_string(":"); | |
12978 | } | |
12979 | ||
e440a328 | 12980 | if (*pv != NULL) |
12981 | (*pv)->export_expression(exp); | |
ffe743ca | 12982 | |
12983 | if (this->indexes_ != NULL) | |
12984 | ++pi; | |
e440a328 | 12985 | } |
12986 | } | |
12987 | exp->write_c_string(")"); | |
12988 | } | |
12989 | ||
0e9a2e72 | 12990 | // Dump ast representation of an array construction expression. |
d751bb78 | 12991 | |
12992 | void | |
12993 | Array_construction_expression::do_dump_expression( | |
12994 | Ast_dump_context* ast_dump_context) const | |
12995 | { | |
ffe743ca | 12996 | Expression* length = this->type_->array_type()->length(); |
8b1c301d | 12997 | |
12998 | ast_dump_context->ostream() << "[" ; | |
12999 | if (length != NULL) | |
13000 | { | |
13001 | ast_dump_context->dump_expression(length); | |
13002 | } | |
13003 | ast_dump_context->ostream() << "]" ; | |
d751bb78 | 13004 | ast_dump_context->dump_type(this->type_); |
0e9a2e72 | 13005 | this->dump_slice_storage_expression(ast_dump_context); |
d751bb78 | 13006 | ast_dump_context->ostream() << "{" ; |
ffe743ca | 13007 | if (this->indexes_ == NULL) |
e32de7ba | 13008 | ast_dump_context->dump_expression_list(this->vals()); |
ffe743ca | 13009 | else |
13010 | { | |
e32de7ba | 13011 | Expression_list::const_iterator pv = this->vals()->begin(); |
ffe743ca | 13012 | for (std::vector<unsigned long>::const_iterator pi = |
13013 | this->indexes_->begin(); | |
13014 | pi != this->indexes_->end(); | |
13015 | ++pi, ++pv) | |
13016 | { | |
13017 | if (pi != this->indexes_->begin()) | |
13018 | ast_dump_context->ostream() << ", "; | |
13019 | ast_dump_context->ostream() << *pi << ':'; | |
13020 | ast_dump_context->dump_expression(*pv); | |
13021 | } | |
13022 | } | |
d751bb78 | 13023 | ast_dump_context->ostream() << "}" ; |
13024 | ||
13025 | } | |
13026 | ||
da244e59 | 13027 | // Class Fixed_array_construction_expression. |
e440a328 | 13028 | |
da244e59 | 13029 | Fixed_array_construction_expression::Fixed_array_construction_expression( |
13030 | Type* type, const std::vector<unsigned long>* indexes, | |
13031 | Expression_list* vals, Location location) | |
13032 | : Array_construction_expression(EXPRESSION_FIXED_ARRAY_CONSTRUCTION, | |
13033 | type, indexes, vals, location) | |
13034 | { go_assert(type->array_type() != NULL && !type->is_slice_type()); } | |
e440a328 | 13035 | |
ea664253 | 13036 | // Return the backend representation for constructing a fixed array. |
e440a328 | 13037 | |
ea664253 | 13038 | Bexpression* |
13039 | Fixed_array_construction_expression::do_get_backend(Translate_context* context) | |
e440a328 | 13040 | { |
9f0e0513 | 13041 | Type* type = this->type(); |
13042 | Btype* btype = type->get_backend(context->gogo()); | |
ea664253 | 13043 | return this->get_constructor(context, btype); |
e440a328 | 13044 | } |
13045 | ||
76f85fd6 | 13046 | Expression* |
13047 | Expression::make_array_composite_literal(Type* type, Expression_list* vals, | |
13048 | Location location) | |
13049 | { | |
13050 | go_assert(type->array_type() != NULL && !type->is_slice_type()); | |
13051 | return new Fixed_array_construction_expression(type, NULL, vals, location); | |
13052 | } | |
13053 | ||
da244e59 | 13054 | // Class Slice_construction_expression. |
e440a328 | 13055 | |
da244e59 | 13056 | Slice_construction_expression::Slice_construction_expression( |
13057 | Type* type, const std::vector<unsigned long>* indexes, | |
13058 | Expression_list* vals, Location location) | |
13059 | : Array_construction_expression(EXPRESSION_SLICE_CONSTRUCTION, | |
13060 | type, indexes, vals, location), | |
0e9a2e72 | 13061 | valtype_(NULL), array_val_(NULL), slice_storage_(NULL), |
13062 | storage_escapes_(true) | |
e440a328 | 13063 | { |
da244e59 | 13064 | go_assert(type->is_slice_type()); |
23d77f91 | 13065 | |
da244e59 | 13066 | unsigned long lenval; |
13067 | Expression* length; | |
13068 | if (vals == NULL || vals->empty()) | |
13069 | lenval = 0; | |
13070 | else | |
13071 | { | |
13072 | if (this->indexes() == NULL) | |
13073 | lenval = vals->size(); | |
13074 | else | |
13075 | lenval = indexes->back() + 1; | |
13076 | } | |
13077 | Type* int_type = Type::lookup_integer_type("int"); | |
13078 | length = Expression::make_integer_ul(lenval, int_type, location); | |
13079 | Type* element_type = type->array_type()->element_type(); | |
6bf4793c | 13080 | Array_type* array_type = Type::make_array_type(element_type, length); |
13081 | array_type->set_is_array_incomparable(); | |
13082 | this->valtype_ = array_type; | |
da244e59 | 13083 | } |
e440a328 | 13084 | |
23d77f91 | 13085 | // Traversal. |
13086 | ||
13087 | int | |
13088 | Slice_construction_expression::do_traverse(Traverse* traverse) | |
13089 | { | |
13090 | if (this->Array_construction_expression::do_traverse(traverse) | |
13091 | == TRAVERSE_EXIT) | |
13092 | return TRAVERSE_EXIT; | |
13093 | if (Type::traverse(this->valtype_, traverse) == TRAVERSE_EXIT) | |
13094 | return TRAVERSE_EXIT; | |
0e9a2e72 | 13095 | if (this->array_val_ != NULL |
13096 | && Expression::traverse(&this->array_val_, traverse) == TRAVERSE_EXIT) | |
13097 | return TRAVERSE_EXIT; | |
13098 | if (this->slice_storage_ != NULL | |
13099 | && Expression::traverse(&this->slice_storage_, traverse) == TRAVERSE_EXIT) | |
13100 | return TRAVERSE_EXIT; | |
23d77f91 | 13101 | return TRAVERSE_CONTINUE; |
13102 | } | |
13103 | ||
0e9a2e72 | 13104 | // Helper routine to create fixed array value underlying the slice literal. |
13105 | // May be called during flattening, or later during do_get_backend(). | |
e440a328 | 13106 | |
0e9a2e72 | 13107 | Expression* |
13108 | Slice_construction_expression::create_array_val() | |
e440a328 | 13109 | { |
f9c68f17 | 13110 | Array_type* array_type = this->type()->array_type(); |
13111 | if (array_type == NULL) | |
13112 | { | |
c484d925 | 13113 | go_assert(this->type()->is_error()); |
0e9a2e72 | 13114 | return NULL; |
f9c68f17 | 13115 | } |
13116 | ||
f23d7786 | 13117 | Location loc = this->location(); |
23d77f91 | 13118 | go_assert(this->valtype_ != NULL); |
3d60812e | 13119 | |
f23d7786 | 13120 | Expression_list* vals = this->vals(); |
0e9a2e72 | 13121 | return new Fixed_array_construction_expression( |
13122 | this->valtype_, this->indexes(), vals, loc); | |
13123 | } | |
13124 | ||
13125 | // If we're previous established that the slice storage does not | |
13126 | // escape, then create a separate array temp val here for it. We | |
13127 | // need to do this as part of flattening so as to be able to insert | |
13128 | // the new temp statement. | |
13129 | ||
13130 | Expression* | |
13131 | Slice_construction_expression::do_flatten(Gogo* gogo, Named_object* no, | |
13132 | Statement_inserter* inserter) | |
13133 | { | |
13134 | if (this->type()->array_type() == NULL) | |
13135 | return NULL; | |
13136 | ||
13137 | // Base class flattening first | |
13138 | this->Array_construction_expression::do_flatten(gogo, no, inserter); | |
13139 | ||
a1bbc2c3 | 13140 | // Create a stack-allocated storage temp if storage won't escape |
03118c21 | 13141 | if (!this->storage_escapes_ |
13142 | && this->slice_storage_ == NULL | |
13143 | && this->element_count() > 0) | |
0e9a2e72 | 13144 | { |
13145 | Location loc = this->location(); | |
03118c21 | 13146 | this->array_val_ = this->create_array_val(); |
0e9a2e72 | 13147 | go_assert(this->array_val_); |
13148 | Temporary_statement* temp = | |
13149 | Statement::make_temporary(this->valtype_, this->array_val_, loc); | |
13150 | inserter->insert(temp); | |
13151 | this->slice_storage_ = Expression::make_temporary_reference(temp, loc); | |
13152 | } | |
13153 | return this; | |
13154 | } | |
13155 | ||
13156 | // When dumping a slice construction expression that has an explicit | |
13157 | // storeage temp, emit the temp here (if we don't do this the storage | |
13158 | // temp appears unused in the AST dump). | |
13159 | ||
13160 | void | |
13161 | Slice_construction_expression:: | |
13162 | dump_slice_storage_expression(Ast_dump_context* ast_dump_context) const | |
13163 | { | |
13164 | if (this->slice_storage_ == NULL) | |
13165 | return; | |
13166 | ast_dump_context->ostream() << "storage=" ; | |
13167 | ast_dump_context->dump_expression(this->slice_storage_); | |
13168 | } | |
13169 | ||
13170 | // Return the backend representation for constructing a slice. | |
13171 | ||
13172 | Bexpression* | |
13173 | Slice_construction_expression::do_get_backend(Translate_context* context) | |
13174 | { | |
13175 | if (this->array_val_ == NULL) | |
03118c21 | 13176 | this->array_val_ = this->create_array_val(); |
0e9a2e72 | 13177 | if (this->array_val_ == NULL) |
13178 | { | |
13179 | go_assert(this->type()->is_error()); | |
13180 | return context->backend()->error_expression(); | |
13181 | } | |
13182 | ||
13183 | Location loc = this->location(); | |
e440a328 | 13184 | |
3ae06f68 | 13185 | bool is_static_initializer = this->array_val_->is_static_initializer(); |
d8829beb | 13186 | |
13187 | // We have to copy the initial values into heap memory if we are in | |
3ae06f68 | 13188 | // a function or if the values are not constants. |
13189 | bool copy_to_heap = context->function() != NULL || !is_static_initializer; | |
e440a328 | 13190 | |
f23d7786 | 13191 | Expression* space; |
0e9a2e72 | 13192 | |
13193 | if (this->slice_storage_ != NULL) | |
13194 | { | |
13195 | go_assert(!this->storage_escapes_); | |
13196 | space = Expression::make_unary(OPERATOR_AND, this->slice_storage_, loc); | |
13197 | } | |
13198 | else if (!copy_to_heap) | |
e440a328 | 13199 | { |
f23d7786 | 13200 | // The initializer will only run once. |
0e9a2e72 | 13201 | space = Expression::make_unary(OPERATOR_AND, this->array_val_, loc); |
f23d7786 | 13202 | space->unary_expression()->set_is_slice_init(); |
e440a328 | 13203 | } |
13204 | else | |
45ff893b | 13205 | { |
0e9a2e72 | 13206 | space = Expression::make_heap_expression(this->array_val_, loc); |
45ff893b | 13207 | Node* n = Node::make_node(this); |
13208 | if ((n->encoding() & ESCAPE_MASK) == int(Node::ESCAPE_NONE)) | |
13209 | { | |
13210 | n = Node::make_node(space); | |
13211 | n->set_encoding(Node::ESCAPE_NONE); | |
13212 | } | |
13213 | } | |
e440a328 | 13214 | |
2c809f8f | 13215 | // Build a constructor for the slice. |
f23d7786 | 13216 | Expression* len = this->valtype_->array_type()->length(); |
13217 | Expression* slice_val = | |
13218 | Expression::make_slice_value(this->type(), space, len, len, loc); | |
ea664253 | 13219 | return slice_val->get_backend(context); |
e440a328 | 13220 | } |
13221 | ||
13222 | // Make a slice composite literal. This is used by the type | |
13223 | // descriptor code. | |
13224 | ||
0e9a2e72 | 13225 | Slice_construction_expression* |
e440a328 | 13226 | Expression::make_slice_composite_literal(Type* type, Expression_list* vals, |
b13c66cd | 13227 | Location location) |
e440a328 | 13228 | { |
411eb89e | 13229 | go_assert(type->is_slice_type()); |
2c809f8f | 13230 | return new Slice_construction_expression(type, NULL, vals, location); |
e440a328 | 13231 | } |
13232 | ||
da244e59 | 13233 | // Class Map_construction_expression. |
e440a328 | 13234 | |
13235 | // Traversal. | |
13236 | ||
13237 | int | |
13238 | Map_construction_expression::do_traverse(Traverse* traverse) | |
13239 | { | |
13240 | if (this->vals_ != NULL | |
13241 | && this->vals_->traverse(traverse) == TRAVERSE_EXIT) | |
13242 | return TRAVERSE_EXIT; | |
13243 | if (Type::traverse(this->type_, traverse) == TRAVERSE_EXIT) | |
13244 | return TRAVERSE_EXIT; | |
13245 | return TRAVERSE_CONTINUE; | |
13246 | } | |
13247 | ||
2c809f8f | 13248 | // Flatten constructor initializer into a temporary variable since |
13249 | // we need to take its address for __go_construct_map. | |
13250 | ||
13251 | Expression* | |
13252 | Map_construction_expression::do_flatten(Gogo* gogo, Named_object*, | |
13253 | Statement_inserter* inserter) | |
13254 | { | |
13255 | if (!this->is_error_expression() | |
13256 | && this->vals_ != NULL | |
13257 | && !this->vals_->empty() | |
13258 | && this->constructor_temp_ == NULL) | |
13259 | { | |
13260 | Map_type* mt = this->type_->map_type(); | |
13261 | Type* key_type = mt->key_type(); | |
13262 | Type* val_type = mt->val_type(); | |
13263 | this->element_type_ = Type::make_builtin_struct_type(2, | |
13264 | "__key", key_type, | |
13265 | "__val", val_type); | |
13266 | ||
13267 | Expression_list* value_pairs = new Expression_list(); | |
13268 | Location loc = this->location(); | |
13269 | ||
13270 | size_t i = 0; | |
13271 | for (Expression_list::const_iterator pv = this->vals_->begin(); | |
13272 | pv != this->vals_->end(); | |
13273 | ++pv, ++i) | |
13274 | { | |
13275 | Expression_list* key_value_pair = new Expression_list(); | |
91c0fd76 | 13276 | Expression* key = *pv; |
5bf8be8b | 13277 | if (key->is_error_expression() || key->type()->is_error_type()) |
13278 | { | |
13279 | go_assert(saw_errors()); | |
13280 | return Expression::make_error(loc); | |
13281 | } | |
91c0fd76 | 13282 | if (key->type()->interface_type() != NULL && !key->is_variable()) |
13283 | { | |
13284 | Temporary_statement* temp = | |
13285 | Statement::make_temporary(NULL, key, loc); | |
13286 | inserter->insert(temp); | |
13287 | key = Expression::make_temporary_reference(temp, loc); | |
13288 | } | |
13289 | key = Expression::convert_for_assignment(gogo, key_type, key, loc); | |
2c809f8f | 13290 | |
13291 | ++pv; | |
91c0fd76 | 13292 | Expression* val = *pv; |
5bf8be8b | 13293 | if (val->is_error_expression() || val->type()->is_error_type()) |
13294 | { | |
13295 | go_assert(saw_errors()); | |
13296 | return Expression::make_error(loc); | |
13297 | } | |
91c0fd76 | 13298 | if (val->type()->interface_type() != NULL && !val->is_variable()) |
13299 | { | |
13300 | Temporary_statement* temp = | |
13301 | Statement::make_temporary(NULL, val, loc); | |
13302 | inserter->insert(temp); | |
13303 | val = Expression::make_temporary_reference(temp, loc); | |
13304 | } | |
13305 | val = Expression::convert_for_assignment(gogo, val_type, val, loc); | |
2c809f8f | 13306 | |
13307 | key_value_pair->push_back(key); | |
13308 | key_value_pair->push_back(val); | |
13309 | value_pairs->push_back( | |
13310 | Expression::make_struct_composite_literal(this->element_type_, | |
13311 | key_value_pair, loc)); | |
13312 | } | |
13313 | ||
e67508fa | 13314 | Expression* element_count = Expression::make_integer_ul(i, NULL, loc); |
6bf4793c | 13315 | Array_type* ctor_type = |
2c809f8f | 13316 | Type::make_array_type(this->element_type_, element_count); |
6bf4793c | 13317 | ctor_type->set_is_array_incomparable(); |
2c809f8f | 13318 | Expression* constructor = |
13319 | new Fixed_array_construction_expression(ctor_type, NULL, | |
13320 | value_pairs, loc); | |
13321 | ||
13322 | this->constructor_temp_ = | |
13323 | Statement::make_temporary(NULL, constructor, loc); | |
13324 | constructor->issue_nil_check(); | |
13325 | this->constructor_temp_->set_is_address_taken(); | |
13326 | inserter->insert(this->constructor_temp_); | |
13327 | } | |
13328 | ||
13329 | return this; | |
13330 | } | |
13331 | ||
e440a328 | 13332 | // Final type determination. |
13333 | ||
13334 | void | |
13335 | Map_construction_expression::do_determine_type(const Type_context*) | |
13336 | { | |
13337 | if (this->vals_ == NULL) | |
13338 | return; | |
13339 | ||
13340 | Map_type* mt = this->type_->map_type(); | |
13341 | Type_context key_context(mt->key_type(), false); | |
13342 | Type_context val_context(mt->val_type(), false); | |
13343 | for (Expression_list::const_iterator pv = this->vals_->begin(); | |
13344 | pv != this->vals_->end(); | |
13345 | ++pv) | |
13346 | { | |
13347 | (*pv)->determine_type(&key_context); | |
13348 | ++pv; | |
13349 | (*pv)->determine_type(&val_context); | |
13350 | } | |
13351 | } | |
13352 | ||
13353 | // Check types. | |
13354 | ||
13355 | void | |
13356 | Map_construction_expression::do_check_types(Gogo*) | |
13357 | { | |
13358 | if (this->vals_ == NULL) | |
13359 | return; | |
13360 | ||
13361 | Map_type* mt = this->type_->map_type(); | |
13362 | int i = 0; | |
13363 | Type* key_type = mt->key_type(); | |
13364 | Type* val_type = mt->val_type(); | |
13365 | for (Expression_list::const_iterator pv = this->vals_->begin(); | |
13366 | pv != this->vals_->end(); | |
13367 | ++pv, ++i) | |
13368 | { | |
13369 | if (!Type::are_assignable(key_type, (*pv)->type(), NULL)) | |
13370 | { | |
631d5788 | 13371 | go_error_at((*pv)->location(), |
13372 | "incompatible type for element %d key in map construction", | |
13373 | i + 1); | |
e440a328 | 13374 | this->set_is_error(); |
13375 | } | |
13376 | ++pv; | |
13377 | if (!Type::are_assignable(val_type, (*pv)->type(), NULL)) | |
13378 | { | |
631d5788 | 13379 | go_error_at((*pv)->location(), |
13380 | ("incompatible type for element %d value " | |
13381 | "in map construction"), | |
e440a328 | 13382 | i + 1); |
13383 | this->set_is_error(); | |
13384 | } | |
13385 | } | |
13386 | } | |
13387 | ||
ea664253 | 13388 | // Return the backend representation for constructing a map. |
e440a328 | 13389 | |
ea664253 | 13390 | Bexpression* |
13391 | Map_construction_expression::do_get_backend(Translate_context* context) | |
e440a328 | 13392 | { |
2c809f8f | 13393 | if (this->is_error_expression()) |
ea664253 | 13394 | return context->backend()->error_expression(); |
2c809f8f | 13395 | Location loc = this->location(); |
e440a328 | 13396 | |
e440a328 | 13397 | size_t i = 0; |
2c809f8f | 13398 | Expression* ventries; |
e440a328 | 13399 | if (this->vals_ == NULL || this->vals_->empty()) |
2c809f8f | 13400 | ventries = Expression::make_nil(loc); |
e440a328 | 13401 | else |
13402 | { | |
2c809f8f | 13403 | go_assert(this->constructor_temp_ != NULL); |
13404 | i = this->vals_->size() / 2; | |
e440a328 | 13405 | |
2c809f8f | 13406 | Expression* ctor_ref = |
13407 | Expression::make_temporary_reference(this->constructor_temp_, loc); | |
13408 | ventries = Expression::make_unary(OPERATOR_AND, ctor_ref, loc); | |
13409 | } | |
e440a328 | 13410 | |
2c809f8f | 13411 | Map_type* mt = this->type_->map_type(); |
13412 | if (this->element_type_ == NULL) | |
13413 | this->element_type_ = | |
13414 | Type::make_builtin_struct_type(2, | |
13415 | "__key", mt->key_type(), | |
13416 | "__val", mt->val_type()); | |
0d5530d9 | 13417 | Expression* descriptor = Expression::make_type_descriptor(mt, loc); |
2c809f8f | 13418 | |
13419 | Type* uintptr_t = Type::lookup_integer_type("uintptr"); | |
e67508fa | 13420 | Expression* count = Expression::make_integer_ul(i, uintptr_t, loc); |
2c809f8f | 13421 | |
13422 | Expression* entry_size = | |
13423 | Expression::make_type_info(this->element_type_, TYPE_INFO_SIZE); | |
13424 | ||
13425 | unsigned int field_index; | |
13426 | const Struct_field* valfield = | |
13427 | this->element_type_->find_local_field("__val", &field_index); | |
13428 | Expression* val_offset = | |
13429 | Expression::make_struct_field_offset(this->element_type_, valfield); | |
2c809f8f | 13430 | |
13431 | Expression* map_ctor = | |
0d5530d9 | 13432 | Runtime::make_call(Runtime::CONSTRUCT_MAP, loc, 5, descriptor, count, |
13433 | entry_size, val_offset, ventries); | |
ea664253 | 13434 | return map_ctor->get_backend(context); |
2c809f8f | 13435 | } |
e440a328 | 13436 | |
2c809f8f | 13437 | // Export an array construction. |
e440a328 | 13438 | |
2c809f8f | 13439 | void |
13440 | Map_construction_expression::do_export(Export* exp) const | |
13441 | { | |
13442 | exp->write_c_string("convert("); | |
13443 | exp->write_type(this->type_); | |
13444 | for (Expression_list::const_iterator pv = this->vals_->begin(); | |
13445 | pv != this->vals_->end(); | |
13446 | ++pv) | |
13447 | { | |
13448 | exp->write_c_string(", "); | |
13449 | (*pv)->export_expression(exp); | |
13450 | } | |
13451 | exp->write_c_string(")"); | |
13452 | } | |
e440a328 | 13453 | |
2c809f8f | 13454 | // Dump ast representation for a map construction expression. |
d751bb78 | 13455 | |
13456 | void | |
13457 | Map_construction_expression::do_dump_expression( | |
13458 | Ast_dump_context* ast_dump_context) const | |
13459 | { | |
d751bb78 | 13460 | ast_dump_context->ostream() << "{" ; |
8b1c301d | 13461 | ast_dump_context->dump_expression_list(this->vals_, true); |
d751bb78 | 13462 | ast_dump_context->ostream() << "}"; |
13463 | } | |
13464 | ||
7795ac51 | 13465 | // Class Composite_literal_expression. |
e440a328 | 13466 | |
13467 | // Traversal. | |
13468 | ||
13469 | int | |
13470 | Composite_literal_expression::do_traverse(Traverse* traverse) | |
13471 | { | |
dbffccfc | 13472 | if (Type::traverse(this->type_, traverse) == TRAVERSE_EXIT) |
e440a328 | 13473 | return TRAVERSE_EXIT; |
dbffccfc | 13474 | |
13475 | // If this is a struct composite literal with keys, then the keys | |
13476 | // are field names, not expressions. We don't want to traverse them | |
13477 | // in that case. If we do, we can give an erroneous error "variable | |
13478 | // initializer refers to itself." See bug482.go in the testsuite. | |
13479 | if (this->has_keys_ && this->vals_ != NULL) | |
13480 | { | |
13481 | // The type may not be resolvable at this point. | |
13482 | Type* type = this->type_; | |
a01f2481 | 13483 | |
7795ac51 | 13484 | for (int depth = 0; depth < this->depth_; ++depth) |
a01f2481 | 13485 | { |
13486 | if (type->array_type() != NULL) | |
13487 | type = type->array_type()->element_type(); | |
13488 | else if (type->map_type() != NULL) | |
7795ac51 | 13489 | { |
13490 | if (this->key_path_[depth]) | |
13491 | type = type->map_type()->key_type(); | |
13492 | else | |
13493 | type = type->map_type()->val_type(); | |
13494 | } | |
a01f2481 | 13495 | else |
13496 | { | |
13497 | // This error will be reported during lowering. | |
13498 | return TRAVERSE_CONTINUE; | |
13499 | } | |
13500 | } | |
13501 | ||
dbffccfc | 13502 | while (true) |
13503 | { | |
13504 | if (type->classification() == Type::TYPE_NAMED) | |
13505 | type = type->named_type()->real_type(); | |
13506 | else if (type->classification() == Type::TYPE_FORWARD) | |
13507 | { | |
13508 | Type* t = type->forwarded(); | |
13509 | if (t == type) | |
13510 | break; | |
13511 | type = t; | |
13512 | } | |
13513 | else | |
13514 | break; | |
13515 | } | |
13516 | ||
13517 | if (type->classification() == Type::TYPE_STRUCT) | |
13518 | { | |
13519 | Expression_list::iterator p = this->vals_->begin(); | |
13520 | while (p != this->vals_->end()) | |
13521 | { | |
13522 | // Skip key. | |
13523 | ++p; | |
13524 | go_assert(p != this->vals_->end()); | |
13525 | if (Expression::traverse(&*p, traverse) == TRAVERSE_EXIT) | |
13526 | return TRAVERSE_EXIT; | |
13527 | ++p; | |
13528 | } | |
13529 | return TRAVERSE_CONTINUE; | |
13530 | } | |
13531 | } | |
13532 | ||
13533 | if (this->vals_ != NULL) | |
13534 | return this->vals_->traverse(traverse); | |
13535 | ||
13536 | return TRAVERSE_CONTINUE; | |
e440a328 | 13537 | } |
13538 | ||
13539 | // Lower a generic composite literal into a specific version based on | |
13540 | // the type. | |
13541 | ||
13542 | Expression* | |
ceeb4318 | 13543 | Composite_literal_expression::do_lower(Gogo* gogo, Named_object* function, |
13544 | Statement_inserter* inserter, int) | |
e440a328 | 13545 | { |
13546 | Type* type = this->type_; | |
13547 | ||
7795ac51 | 13548 | for (int depth = 0; depth < this->depth_; ++depth) |
e440a328 | 13549 | { |
13550 | if (type->array_type() != NULL) | |
13551 | type = type->array_type()->element_type(); | |
13552 | else if (type->map_type() != NULL) | |
7795ac51 | 13553 | { |
13554 | if (this->key_path_[depth]) | |
13555 | type = type->map_type()->key_type(); | |
13556 | else | |
13557 | type = type->map_type()->val_type(); | |
13558 | } | |
e440a328 | 13559 | else |
13560 | { | |
5c13bd80 | 13561 | if (!type->is_error()) |
631d5788 | 13562 | go_error_at(this->location(), |
13563 | ("may only omit types within composite literals " | |
13564 | "of slice, array, or map type")); | |
e440a328 | 13565 | return Expression::make_error(this->location()); |
13566 | } | |
13567 | } | |
13568 | ||
e00772b3 | 13569 | Type *pt = type->points_to(); |
13570 | bool is_pointer = false; | |
13571 | if (pt != NULL) | |
13572 | { | |
13573 | is_pointer = true; | |
13574 | type = pt; | |
13575 | } | |
13576 | ||
13577 | Expression* ret; | |
5c13bd80 | 13578 | if (type->is_error()) |
e440a328 | 13579 | return Expression::make_error(this->location()); |
13580 | else if (type->struct_type() != NULL) | |
e00772b3 | 13581 | ret = this->lower_struct(gogo, type); |
e440a328 | 13582 | else if (type->array_type() != NULL) |
113ef6a5 | 13583 | ret = this->lower_array(type); |
e440a328 | 13584 | else if (type->map_type() != NULL) |
e00772b3 | 13585 | ret = this->lower_map(gogo, function, inserter, type); |
e440a328 | 13586 | else |
13587 | { | |
631d5788 | 13588 | go_error_at(this->location(), |
13589 | ("expected struct, slice, array, or map type " | |
13590 | "for composite literal")); | |
e440a328 | 13591 | return Expression::make_error(this->location()); |
13592 | } | |
e00772b3 | 13593 | |
13594 | if (is_pointer) | |
2c809f8f | 13595 | ret = Expression::make_heap_expression(ret, this->location()); |
e00772b3 | 13596 | |
13597 | return ret; | |
e440a328 | 13598 | } |
13599 | ||
13600 | // Lower a struct composite literal. | |
13601 | ||
13602 | Expression* | |
81c4b26b | 13603 | Composite_literal_expression::lower_struct(Gogo* gogo, Type* type) |
e440a328 | 13604 | { |
b13c66cd | 13605 | Location location = this->location(); |
e440a328 | 13606 | Struct_type* st = type->struct_type(); |
13607 | if (this->vals_ == NULL || !this->has_keys_) | |
07daa4e7 | 13608 | { |
e6013c28 | 13609 | if (this->vals_ != NULL |
13610 | && !this->vals_->empty() | |
13611 | && type->named_type() != NULL | |
13612 | && type->named_type()->named_object()->package() != NULL) | |
13613 | { | |
13614 | for (Struct_field_list::const_iterator pf = st->fields()->begin(); | |
13615 | pf != st->fields()->end(); | |
13616 | ++pf) | |
07daa4e7 | 13617 | { |
07ba7f26 | 13618 | if (Gogo::is_hidden_name(pf->field_name()) |
13619 | || pf->is_embedded_builtin(gogo)) | |
631d5788 | 13620 | go_error_at(this->location(), |
13621 | "assignment of unexported field %qs in %qs literal", | |
13622 | Gogo::message_name(pf->field_name()).c_str(), | |
13623 | type->named_type()->message_name().c_str()); | |
07daa4e7 | 13624 | } |
13625 | } | |
13626 | ||
13627 | return new Struct_construction_expression(type, this->vals_, location); | |
13628 | } | |
e440a328 | 13629 | |
13630 | size_t field_count = st->field_count(); | |
13631 | std::vector<Expression*> vals(field_count); | |
e32de7ba | 13632 | std::vector<unsigned long>* traverse_order = new(std::vector<unsigned long>); |
e440a328 | 13633 | Expression_list::const_iterator p = this->vals_->begin(); |
62750cd5 | 13634 | Expression* external_expr = NULL; |
13635 | const Named_object* external_no = NULL; | |
e440a328 | 13636 | while (p != this->vals_->end()) |
13637 | { | |
13638 | Expression* name_expr = *p; | |
13639 | ||
13640 | ++p; | |
c484d925 | 13641 | go_assert(p != this->vals_->end()); |
e440a328 | 13642 | Expression* val = *p; |
13643 | ||
13644 | ++p; | |
13645 | ||
13646 | if (name_expr == NULL) | |
13647 | { | |
631d5788 | 13648 | go_error_at(val->location(), |
13649 | "mixture of field and value initializers"); | |
e440a328 | 13650 | return Expression::make_error(location); |
13651 | } | |
13652 | ||
13653 | bool bad_key = false; | |
13654 | std::string name; | |
81c4b26b | 13655 | const Named_object* no = NULL; |
e440a328 | 13656 | switch (name_expr->classification()) |
13657 | { | |
13658 | case EXPRESSION_UNKNOWN_REFERENCE: | |
13659 | name = name_expr->unknown_expression()->name(); | |
7f7ce694 | 13660 | if (type->named_type() != NULL) |
13661 | { | |
13662 | // If the named object found for this field name comes from a | |
13663 | // different package than the struct it is a part of, do not count | |
13664 | // this incorrect lookup as a usage of the object's package. | |
13665 | no = name_expr->unknown_expression()->named_object(); | |
13666 | if (no->package() != NULL | |
13667 | && no->package() != type->named_type()->named_object()->package()) | |
13668 | no->package()->forget_usage(name_expr); | |
13669 | } | |
e440a328 | 13670 | break; |
13671 | ||
13672 | case EXPRESSION_CONST_REFERENCE: | |
81c4b26b | 13673 | no = static_cast<Const_expression*>(name_expr)->named_object(); |
e440a328 | 13674 | break; |
13675 | ||
13676 | case EXPRESSION_TYPE: | |
13677 | { | |
13678 | Type* t = name_expr->type(); | |
13679 | Named_type* nt = t->named_type(); | |
13680 | if (nt == NULL) | |
13681 | bad_key = true; | |
13682 | else | |
81c4b26b | 13683 | no = nt->named_object(); |
e440a328 | 13684 | } |
13685 | break; | |
13686 | ||
13687 | case EXPRESSION_VAR_REFERENCE: | |
81c4b26b | 13688 | no = name_expr->var_expression()->named_object(); |
e440a328 | 13689 | break; |
13690 | ||
b0c09712 | 13691 | case EXPRESSION_ENCLOSED_VAR_REFERENCE: |
13692 | no = name_expr->enclosed_var_expression()->variable(); | |
e440a328 | 13693 | break; |
13694 | ||
b0c09712 | 13695 | case EXPRESSION_FUNC_REFERENCE: |
13696 | no = name_expr->func_expression()->named_object(); | |
e440a328 | 13697 | break; |
13698 | ||
13699 | default: | |
13700 | bad_key = true; | |
13701 | break; | |
13702 | } | |
13703 | if (bad_key) | |
13704 | { | |
631d5788 | 13705 | go_error_at(name_expr->location(), "expected struct field name"); |
e440a328 | 13706 | return Expression::make_error(location); |
13707 | } | |
13708 | ||
81c4b26b | 13709 | if (no != NULL) |
13710 | { | |
62750cd5 | 13711 | if (no->package() != NULL && external_expr == NULL) |
13712 | { | |
13713 | external_expr = name_expr; | |
13714 | external_no = no; | |
13715 | } | |
13716 | ||
81c4b26b | 13717 | name = no->name(); |
13718 | ||
13719 | // A predefined name won't be packed. If it starts with a | |
13720 | // lower case letter we need to check for that case, because | |
2d29d278 | 13721 | // the field name will be packed. FIXME. |
81c4b26b | 13722 | if (!Gogo::is_hidden_name(name) |
13723 | && name[0] >= 'a' | |
13724 | && name[0] <= 'z') | |
13725 | { | |
13726 | Named_object* gno = gogo->lookup_global(name.c_str()); | |
13727 | if (gno == no) | |
13728 | name = gogo->pack_hidden_name(name, false); | |
13729 | } | |
13730 | } | |
13731 | ||
e440a328 | 13732 | unsigned int index; |
13733 | const Struct_field* sf = st->find_local_field(name, &index); | |
13734 | if (sf == NULL) | |
13735 | { | |
631d5788 | 13736 | go_error_at(name_expr->location(), "unknown field %qs in %qs", |
13737 | Gogo::message_name(name).c_str(), | |
13738 | (type->named_type() != NULL | |
13739 | ? type->named_type()->message_name().c_str() | |
13740 | : "unnamed struct")); | |
e440a328 | 13741 | return Expression::make_error(location); |
13742 | } | |
13743 | if (vals[index] != NULL) | |
13744 | { | |
631d5788 | 13745 | go_error_at(name_expr->location(), |
13746 | "duplicate value for field %qs in %qs", | |
13747 | Gogo::message_name(name).c_str(), | |
13748 | (type->named_type() != NULL | |
13749 | ? type->named_type()->message_name().c_str() | |
13750 | : "unnamed struct")); | |
e440a328 | 13751 | return Expression::make_error(location); |
13752 | } | |
13753 | ||
07daa4e7 | 13754 | if (type->named_type() != NULL |
13755 | && type->named_type()->named_object()->package() != NULL | |
07ba7f26 | 13756 | && (Gogo::is_hidden_name(sf->field_name()) |
13757 | || sf->is_embedded_builtin(gogo))) | |
631d5788 | 13758 | go_error_at(name_expr->location(), |
13759 | "assignment of unexported field %qs in %qs literal", | |
13760 | Gogo::message_name(sf->field_name()).c_str(), | |
13761 | type->named_type()->message_name().c_str()); | |
07daa4e7 | 13762 | |
e440a328 | 13763 | vals[index] = val; |
e32de7ba | 13764 | traverse_order->push_back(static_cast<unsigned long>(index)); |
e440a328 | 13765 | } |
13766 | ||
62750cd5 | 13767 | if (!this->all_are_names_) |
13768 | { | |
13769 | // This is a weird case like bug462 in the testsuite. | |
13770 | if (external_expr == NULL) | |
631d5788 | 13771 | go_error_at(this->location(), "unknown field in %qs literal", |
13772 | (type->named_type() != NULL | |
13773 | ? type->named_type()->message_name().c_str() | |
13774 | : "unnamed struct")); | |
62750cd5 | 13775 | else |
631d5788 | 13776 | go_error_at(external_expr->location(), "unknown field %qs in %qs", |
13777 | external_no->message_name().c_str(), | |
13778 | (type->named_type() != NULL | |
13779 | ? type->named_type()->message_name().c_str() | |
13780 | : "unnamed struct")); | |
62750cd5 | 13781 | return Expression::make_error(location); |
13782 | } | |
13783 | ||
e440a328 | 13784 | Expression_list* list = new Expression_list; |
13785 | list->reserve(field_count); | |
13786 | for (size_t i = 0; i < field_count; ++i) | |
13787 | list->push_back(vals[i]); | |
13788 | ||
0c4f5a19 | 13789 | Struct_construction_expression* ret = |
13790 | new Struct_construction_expression(type, list, location); | |
13791 | ret->set_traverse_order(traverse_order); | |
13792 | return ret; | |
e440a328 | 13793 | } |
13794 | ||
e32de7ba | 13795 | // Index/value/traversal-order triple. |
00773463 | 13796 | |
e32de7ba | 13797 | struct IVT_triple { |
13798 | unsigned long index; | |
13799 | unsigned long traversal_order; | |
13800 | Expression* expr; | |
13801 | IVT_triple(unsigned long i, unsigned long to, Expression *e) | |
13802 | : index(i), traversal_order(to), expr(e) { } | |
13803 | bool operator<(const IVT_triple& other) const | |
13804 | { return this->index < other.index; } | |
00773463 | 13805 | }; |
13806 | ||
e440a328 | 13807 | // Lower an array composite literal. |
13808 | ||
13809 | Expression* | |
113ef6a5 | 13810 | Composite_literal_expression::lower_array(Type* type) |
e440a328 | 13811 | { |
b13c66cd | 13812 | Location location = this->location(); |
e440a328 | 13813 | if (this->vals_ == NULL || !this->has_keys_) |
ffe743ca | 13814 | return this->make_array(type, NULL, this->vals_); |
e440a328 | 13815 | |
ffe743ca | 13816 | std::vector<unsigned long>* indexes = new std::vector<unsigned long>; |
13817 | indexes->reserve(this->vals_->size()); | |
00773463 | 13818 | bool indexes_out_of_order = false; |
ffe743ca | 13819 | Expression_list* vals = new Expression_list(); |
13820 | vals->reserve(this->vals_->size()); | |
e440a328 | 13821 | unsigned long index = 0; |
13822 | Expression_list::const_iterator p = this->vals_->begin(); | |
13823 | while (p != this->vals_->end()) | |
13824 | { | |
13825 | Expression* index_expr = *p; | |
13826 | ||
13827 | ++p; | |
c484d925 | 13828 | go_assert(p != this->vals_->end()); |
e440a328 | 13829 | Expression* val = *p; |
13830 | ||
13831 | ++p; | |
13832 | ||
ffe743ca | 13833 | if (index_expr == NULL) |
13834 | { | |
13835 | if (!indexes->empty()) | |
13836 | indexes->push_back(index); | |
13837 | } | |
13838 | else | |
e440a328 | 13839 | { |
ffe743ca | 13840 | if (indexes->empty() && !vals->empty()) |
13841 | { | |
13842 | for (size_t i = 0; i < vals->size(); ++i) | |
13843 | indexes->push_back(i); | |
13844 | } | |
13845 | ||
0c77715b | 13846 | Numeric_constant nc; |
13847 | if (!index_expr->numeric_constant_value(&nc)) | |
e440a328 | 13848 | { |
631d5788 | 13849 | go_error_at(index_expr->location(), |
13850 | "index expression is not integer constant"); | |
e440a328 | 13851 | return Expression::make_error(location); |
13852 | } | |
6f6d9955 | 13853 | |
0c77715b | 13854 | switch (nc.to_unsigned_long(&index)) |
e440a328 | 13855 | { |
0c77715b | 13856 | case Numeric_constant::NC_UL_VALID: |
13857 | break; | |
13858 | case Numeric_constant::NC_UL_NOTINT: | |
631d5788 | 13859 | go_error_at(index_expr->location(), |
13860 | "index expression is not integer constant"); | |
0c77715b | 13861 | return Expression::make_error(location); |
13862 | case Numeric_constant::NC_UL_NEGATIVE: | |
631d5788 | 13863 | go_error_at(index_expr->location(), |
13864 | "index expression is negative"); | |
e440a328 | 13865 | return Expression::make_error(location); |
0c77715b | 13866 | case Numeric_constant::NC_UL_BIG: |
631d5788 | 13867 | go_error_at(index_expr->location(), "index value overflow"); |
e440a328 | 13868 | return Expression::make_error(location); |
0c77715b | 13869 | default: |
13870 | go_unreachable(); | |
e440a328 | 13871 | } |
6f6d9955 | 13872 | |
13873 | Named_type* ntype = Type::lookup_integer_type("int"); | |
13874 | Integer_type* inttype = ntype->integer_type(); | |
0c77715b | 13875 | if (sizeof(index) <= static_cast<size_t>(inttype->bits() * 8) |
13876 | && index >> (inttype->bits() - 1) != 0) | |
6f6d9955 | 13877 | { |
631d5788 | 13878 | go_error_at(index_expr->location(), "index value overflow"); |
6f6d9955 | 13879 | return Expression::make_error(location); |
13880 | } | |
13881 | ||
ffe743ca | 13882 | if (std::find(indexes->begin(), indexes->end(), index) |
13883 | != indexes->end()) | |
e440a328 | 13884 | { |
631d5788 | 13885 | go_error_at(index_expr->location(), |
13886 | "duplicate value for index %lu", | |
13887 | index); | |
e440a328 | 13888 | return Expression::make_error(location); |
13889 | } | |
ffe743ca | 13890 | |
00773463 | 13891 | if (!indexes->empty() && index < indexes->back()) |
13892 | indexes_out_of_order = true; | |
13893 | ||
ffe743ca | 13894 | indexes->push_back(index); |
e440a328 | 13895 | } |
13896 | ||
ffe743ca | 13897 | vals->push_back(val); |
13898 | ||
e440a328 | 13899 | ++index; |
13900 | } | |
13901 | ||
ffe743ca | 13902 | if (indexes->empty()) |
13903 | { | |
13904 | delete indexes; | |
13905 | indexes = NULL; | |
13906 | } | |
e440a328 | 13907 | |
e32de7ba | 13908 | std::vector<unsigned long>* traverse_order = NULL; |
00773463 | 13909 | if (indexes_out_of_order) |
13910 | { | |
e32de7ba | 13911 | typedef std::vector<IVT_triple> V; |
00773463 | 13912 | |
13913 | V v; | |
13914 | v.reserve(indexes->size()); | |
13915 | std::vector<unsigned long>::const_iterator pi = indexes->begin(); | |
e32de7ba | 13916 | unsigned long torder = 0; |
00773463 | 13917 | for (Expression_list::const_iterator pe = vals->begin(); |
13918 | pe != vals->end(); | |
e32de7ba | 13919 | ++pe, ++pi, ++torder) |
13920 | v.push_back(IVT_triple(*pi, torder, *pe)); | |
00773463 | 13921 | |
e32de7ba | 13922 | std::sort(v.begin(), v.end()); |
00773463 | 13923 | |
13924 | delete indexes; | |
13925 | delete vals; | |
e32de7ba | 13926 | |
00773463 | 13927 | indexes = new std::vector<unsigned long>(); |
13928 | indexes->reserve(v.size()); | |
13929 | vals = new Expression_list(); | |
13930 | vals->reserve(v.size()); | |
e32de7ba | 13931 | traverse_order = new std::vector<unsigned long>(); |
13932 | traverse_order->reserve(v.size()); | |
00773463 | 13933 | |
13934 | for (V::const_iterator p = v.begin(); p != v.end(); ++p) | |
13935 | { | |
e32de7ba | 13936 | indexes->push_back(p->index); |
13937 | vals->push_back(p->expr); | |
13938 | traverse_order->push_back(p->traversal_order); | |
00773463 | 13939 | } |
13940 | } | |
13941 | ||
e32de7ba | 13942 | Expression* ret = this->make_array(type, indexes, vals); |
13943 | Array_construction_expression* ace = ret->array_literal(); | |
13944 | if (ace != NULL && traverse_order != NULL) | |
13945 | ace->set_traverse_order(traverse_order); | |
13946 | return ret; | |
e440a328 | 13947 | } |
13948 | ||
13949 | // Actually build the array composite literal. This handles | |
13950 | // [...]{...}. | |
13951 | ||
13952 | Expression* | |
ffe743ca | 13953 | Composite_literal_expression::make_array( |
13954 | Type* type, | |
13955 | const std::vector<unsigned long>* indexes, | |
13956 | Expression_list* vals) | |
e440a328 | 13957 | { |
b13c66cd | 13958 | Location location = this->location(); |
e440a328 | 13959 | Array_type* at = type->array_type(); |
ffe743ca | 13960 | |
e440a328 | 13961 | if (at->length() != NULL && at->length()->is_nil_expression()) |
13962 | { | |
ffe743ca | 13963 | size_t size; |
13964 | if (vals == NULL) | |
13965 | size = 0; | |
00773463 | 13966 | else if (indexes != NULL) |
13967 | size = indexes->back() + 1; | |
13968 | else | |
ffe743ca | 13969 | { |
13970 | size = vals->size(); | |
13971 | Integer_type* it = Type::lookup_integer_type("int")->integer_type(); | |
13972 | if (sizeof(size) <= static_cast<size_t>(it->bits() * 8) | |
13973 | && size >> (it->bits() - 1) != 0) | |
13974 | { | |
631d5788 | 13975 | go_error_at(location, "too many elements in composite literal"); |
ffe743ca | 13976 | return Expression::make_error(location); |
13977 | } | |
13978 | } | |
ffe743ca | 13979 | |
e67508fa | 13980 | Expression* elen = Expression::make_integer_ul(size, NULL, location); |
e440a328 | 13981 | at = Type::make_array_type(at->element_type(), elen); |
13982 | type = at; | |
13983 | } | |
ffe743ca | 13984 | else if (at->length() != NULL |
13985 | && !at->length()->is_error_expression() | |
13986 | && this->vals_ != NULL) | |
13987 | { | |
13988 | Numeric_constant nc; | |
13989 | unsigned long val; | |
13990 | if (at->length()->numeric_constant_value(&nc) | |
13991 | && nc.to_unsigned_long(&val) == Numeric_constant::NC_UL_VALID) | |
13992 | { | |
13993 | if (indexes == NULL) | |
13994 | { | |
13995 | if (this->vals_->size() > val) | |
13996 | { | |
631d5788 | 13997 | go_error_at(location, |
13998 | "too many elements in composite literal"); | |
ffe743ca | 13999 | return Expression::make_error(location); |
14000 | } | |
14001 | } | |
14002 | else | |
14003 | { | |
00773463 | 14004 | unsigned long max = indexes->back(); |
ffe743ca | 14005 | if (max >= val) |
14006 | { | |
631d5788 | 14007 | go_error_at(location, |
14008 | ("some element keys in composite literal " | |
14009 | "are out of range")); | |
ffe743ca | 14010 | return Expression::make_error(location); |
14011 | } | |
14012 | } | |
14013 | } | |
14014 | } | |
14015 | ||
e440a328 | 14016 | if (at->length() != NULL) |
ffe743ca | 14017 | return new Fixed_array_construction_expression(type, indexes, vals, |
14018 | location); | |
e440a328 | 14019 | else |
2c809f8f | 14020 | return new Slice_construction_expression(type, indexes, vals, location); |
e440a328 | 14021 | } |
14022 | ||
14023 | // Lower a map composite literal. | |
14024 | ||
14025 | Expression* | |
a287720d | 14026 | Composite_literal_expression::lower_map(Gogo* gogo, Named_object* function, |
ceeb4318 | 14027 | Statement_inserter* inserter, |
a287720d | 14028 | Type* type) |
e440a328 | 14029 | { |
b13c66cd | 14030 | Location location = this->location(); |
e440a328 | 14031 | if (this->vals_ != NULL) |
14032 | { | |
14033 | if (!this->has_keys_) | |
14034 | { | |
631d5788 | 14035 | go_error_at(location, "map composite literal must have keys"); |
e440a328 | 14036 | return Expression::make_error(location); |
14037 | } | |
14038 | ||
a287720d | 14039 | for (Expression_list::iterator p = this->vals_->begin(); |
e440a328 | 14040 | p != this->vals_->end(); |
14041 | p += 2) | |
14042 | { | |
14043 | if (*p == NULL) | |
14044 | { | |
14045 | ++p; | |
631d5788 | 14046 | go_error_at((*p)->location(), |
14047 | ("map composite literal must " | |
14048 | "have keys for every value")); | |
e440a328 | 14049 | return Expression::make_error(location); |
14050 | } | |
a287720d | 14051 | // Make sure we have lowered the key; it may not have been |
14052 | // lowered in order to handle keys for struct composite | |
14053 | // literals. Lower it now to get the right error message. | |
14054 | if ((*p)->unknown_expression() != NULL) | |
14055 | { | |
14056 | (*p)->unknown_expression()->clear_is_composite_literal_key(); | |
ceeb4318 | 14057 | gogo->lower_expression(function, inserter, &*p); |
c484d925 | 14058 | go_assert((*p)->is_error_expression()); |
a287720d | 14059 | return Expression::make_error(location); |
14060 | } | |
e440a328 | 14061 | } |
14062 | } | |
14063 | ||
14064 | return new Map_construction_expression(type, this->vals_, location); | |
14065 | } | |
14066 | ||
d751bb78 | 14067 | // Dump ast representation for a composite literal expression. |
14068 | ||
14069 | void | |
14070 | Composite_literal_expression::do_dump_expression( | |
14071 | Ast_dump_context* ast_dump_context) const | |
14072 | { | |
8b1c301d | 14073 | ast_dump_context->ostream() << "composite("; |
d751bb78 | 14074 | ast_dump_context->dump_type(this->type_); |
14075 | ast_dump_context->ostream() << ", {"; | |
8b1c301d | 14076 | ast_dump_context->dump_expression_list(this->vals_, this->has_keys_); |
d751bb78 | 14077 | ast_dump_context->ostream() << "})"; |
14078 | } | |
14079 | ||
e440a328 | 14080 | // Make a composite literal expression. |
14081 | ||
14082 | Expression* | |
14083 | Expression::make_composite_literal(Type* type, int depth, bool has_keys, | |
62750cd5 | 14084 | Expression_list* vals, bool all_are_names, |
b13c66cd | 14085 | Location location) |
e440a328 | 14086 | { |
14087 | return new Composite_literal_expression(type, depth, has_keys, vals, | |
62750cd5 | 14088 | all_are_names, location); |
e440a328 | 14089 | } |
14090 | ||
14091 | // Return whether this expression is a composite literal. | |
14092 | ||
14093 | bool | |
14094 | Expression::is_composite_literal() const | |
14095 | { | |
14096 | switch (this->classification_) | |
14097 | { | |
14098 | case EXPRESSION_COMPOSITE_LITERAL: | |
14099 | case EXPRESSION_STRUCT_CONSTRUCTION: | |
14100 | case EXPRESSION_FIXED_ARRAY_CONSTRUCTION: | |
2c809f8f | 14101 | case EXPRESSION_SLICE_CONSTRUCTION: |
e440a328 | 14102 | case EXPRESSION_MAP_CONSTRUCTION: |
14103 | return true; | |
14104 | default: | |
14105 | return false; | |
14106 | } | |
14107 | } | |
14108 | ||
14109 | // Return whether this expression is a composite literal which is not | |
14110 | // constant. | |
14111 | ||
14112 | bool | |
14113 | Expression::is_nonconstant_composite_literal() const | |
14114 | { | |
14115 | switch (this->classification_) | |
14116 | { | |
14117 | case EXPRESSION_STRUCT_CONSTRUCTION: | |
14118 | { | |
14119 | const Struct_construction_expression *psce = | |
14120 | static_cast<const Struct_construction_expression*>(this); | |
14121 | return !psce->is_constant_struct(); | |
14122 | } | |
14123 | case EXPRESSION_FIXED_ARRAY_CONSTRUCTION: | |
14124 | { | |
14125 | const Fixed_array_construction_expression *pace = | |
14126 | static_cast<const Fixed_array_construction_expression*>(this); | |
14127 | return !pace->is_constant_array(); | |
14128 | } | |
2c809f8f | 14129 | case EXPRESSION_SLICE_CONSTRUCTION: |
e440a328 | 14130 | { |
2c809f8f | 14131 | const Slice_construction_expression *pace = |
14132 | static_cast<const Slice_construction_expression*>(this); | |
e440a328 | 14133 | return !pace->is_constant_array(); |
14134 | } | |
14135 | case EXPRESSION_MAP_CONSTRUCTION: | |
14136 | return true; | |
14137 | default: | |
14138 | return false; | |
14139 | } | |
14140 | } | |
14141 | ||
35a54f17 | 14142 | // Return true if this is a variable or temporary_variable. |
14143 | ||
14144 | bool | |
14145 | Expression::is_variable() const | |
14146 | { | |
14147 | switch (this->classification_) | |
14148 | { | |
14149 | case EXPRESSION_VAR_REFERENCE: | |
14150 | case EXPRESSION_TEMPORARY_REFERENCE: | |
14151 | case EXPRESSION_SET_AND_USE_TEMPORARY: | |
b0c09712 | 14152 | case EXPRESSION_ENCLOSED_VAR_REFERENCE: |
35a54f17 | 14153 | return true; |
14154 | default: | |
14155 | return false; | |
14156 | } | |
14157 | } | |
14158 | ||
e440a328 | 14159 | // Return true if this is a reference to a local variable. |
14160 | ||
14161 | bool | |
14162 | Expression::is_local_variable() const | |
14163 | { | |
14164 | const Var_expression* ve = this->var_expression(); | |
14165 | if (ve == NULL) | |
14166 | return false; | |
14167 | const Named_object* no = ve->named_object(); | |
14168 | return (no->is_result_variable() | |
14169 | || (no->is_variable() && !no->var_value()->is_global())); | |
14170 | } | |
14171 | ||
14172 | // Class Type_guard_expression. | |
14173 | ||
14174 | // Traversal. | |
14175 | ||
14176 | int | |
14177 | Type_guard_expression::do_traverse(Traverse* traverse) | |
14178 | { | |
14179 | if (Expression::traverse(&this->expr_, traverse) == TRAVERSE_EXIT | |
14180 | || Type::traverse(this->type_, traverse) == TRAVERSE_EXIT) | |
14181 | return TRAVERSE_EXIT; | |
14182 | return TRAVERSE_CONTINUE; | |
14183 | } | |
14184 | ||
2c809f8f | 14185 | Expression* |
14186 | Type_guard_expression::do_flatten(Gogo*, Named_object*, | |
14187 | Statement_inserter* inserter) | |
14188 | { | |
5bf8be8b | 14189 | if (this->expr_->is_error_expression() |
14190 | || this->expr_->type()->is_error_type()) | |
14191 | { | |
14192 | go_assert(saw_errors()); | |
14193 | return Expression::make_error(this->location()); | |
14194 | } | |
14195 | ||
2c809f8f | 14196 | if (!this->expr_->is_variable()) |
14197 | { | |
14198 | Temporary_statement* temp = Statement::make_temporary(NULL, this->expr_, | |
14199 | this->location()); | |
14200 | inserter->insert(temp); | |
14201 | this->expr_ = | |
14202 | Expression::make_temporary_reference(temp, this->location()); | |
14203 | } | |
14204 | return this; | |
14205 | } | |
14206 | ||
e440a328 | 14207 | // Check types of a type guard expression. The expression must have |
14208 | // an interface type, but the actual type conversion is checked at run | |
14209 | // time. | |
14210 | ||
14211 | void | |
14212 | Type_guard_expression::do_check_types(Gogo*) | |
14213 | { | |
e440a328 | 14214 | Type* expr_type = this->expr_->type(); |
7e9da23f | 14215 | if (expr_type->interface_type() == NULL) |
f725ade8 | 14216 | { |
5c13bd80 | 14217 | if (!expr_type->is_error() && !this->type_->is_error()) |
f725ade8 | 14218 | this->report_error(_("type assertion only valid for interface types")); |
14219 | this->set_is_error(); | |
14220 | } | |
e440a328 | 14221 | else if (this->type_->interface_type() == NULL) |
14222 | { | |
14223 | std::string reason; | |
14224 | if (!expr_type->interface_type()->implements_interface(this->type_, | |
14225 | &reason)) | |
14226 | { | |
5c13bd80 | 14227 | if (!this->type_->is_error()) |
e440a328 | 14228 | { |
f725ade8 | 14229 | if (reason.empty()) |
14230 | this->report_error(_("impossible type assertion: " | |
14231 | "type does not implement interface")); | |
14232 | else | |
631d5788 | 14233 | go_error_at(this->location(), |
14234 | ("impossible type assertion: " | |
14235 | "type does not implement interface (%s)"), | |
14236 | reason.c_str()); | |
e440a328 | 14237 | } |
f725ade8 | 14238 | this->set_is_error(); |
e440a328 | 14239 | } |
14240 | } | |
14241 | } | |
14242 | ||
ea664253 | 14243 | // Return the backend representation for a type guard expression. |
e440a328 | 14244 | |
ea664253 | 14245 | Bexpression* |
14246 | Type_guard_expression::do_get_backend(Translate_context* context) | |
e440a328 | 14247 | { |
2c809f8f | 14248 | Expression* conversion; |
7e9da23f | 14249 | if (this->type_->interface_type() != NULL) |
2c809f8f | 14250 | conversion = |
14251 | Expression::convert_interface_to_interface(this->type_, this->expr_, | |
14252 | true, this->location()); | |
e440a328 | 14253 | else |
2c809f8f | 14254 | conversion = |
14255 | Expression::convert_for_assignment(context->gogo(), this->type_, | |
14256 | this->expr_, this->location()); | |
14257 | ||
ea664253 | 14258 | return conversion->get_backend(context); |
e440a328 | 14259 | } |
14260 | ||
d751bb78 | 14261 | // Dump ast representation for a type guard expression. |
14262 | ||
14263 | void | |
2c809f8f | 14264 | Type_guard_expression::do_dump_expression(Ast_dump_context* ast_dump_context) |
d751bb78 | 14265 | const |
14266 | { | |
14267 | this->expr_->dump_expression(ast_dump_context); | |
14268 | ast_dump_context->ostream() << "."; | |
14269 | ast_dump_context->dump_type(this->type_); | |
14270 | } | |
14271 | ||
e440a328 | 14272 | // Make a type guard expression. |
14273 | ||
14274 | Expression* | |
14275 | Expression::make_type_guard(Expression* expr, Type* type, | |
b13c66cd | 14276 | Location location) |
e440a328 | 14277 | { |
14278 | return new Type_guard_expression(expr, type, location); | |
14279 | } | |
14280 | ||
2c809f8f | 14281 | // Class Heap_expression. |
e440a328 | 14282 | |
da244e59 | 14283 | // Return the type of the expression stored on the heap. |
e440a328 | 14284 | |
da244e59 | 14285 | Type* |
14286 | Heap_expression::do_type() | |
14287 | { return Type::make_pointer_type(this->expr_->type()); } | |
e440a328 | 14288 | |
ea664253 | 14289 | // Return the backend representation for allocating an expression on the heap. |
e440a328 | 14290 | |
ea664253 | 14291 | Bexpression* |
14292 | Heap_expression::do_get_backend(Translate_context* context) | |
e440a328 | 14293 | { |
03118c21 | 14294 | Type* etype = this->expr_->type(); |
14295 | if (this->expr_->is_error_expression() || etype->is_error()) | |
ea664253 | 14296 | return context->backend()->error_expression(); |
2c809f8f | 14297 | |
02c19a1a | 14298 | Location loc = this->location(); |
2c809f8f | 14299 | Gogo* gogo = context->gogo(); |
02c19a1a | 14300 | Btype* btype = this->type()->get_backend(gogo); |
45ff893b | 14301 | |
03118c21 | 14302 | Expression* alloc = Expression::make_allocation(etype, loc); |
45ff893b | 14303 | Node* n = Node::make_node(this); |
14304 | if ((n->encoding() & ESCAPE_MASK) == int(Node::ESCAPE_NONE)) | |
14305 | alloc->allocation_expression()->set_allocate_on_stack(); | |
14306 | Bexpression* space = alloc->get_backend(context); | |
02c19a1a | 14307 | |
14308 | Bstatement* decl; | |
14309 | Named_object* fn = context->function(); | |
14310 | go_assert(fn != NULL); | |
14311 | Bfunction* fndecl = fn->func_value()->get_or_make_decl(gogo, fn); | |
14312 | Bvariable* space_temp = | |
14313 | gogo->backend()->temporary_variable(fndecl, context->bblock(), btype, | |
14314 | space, true, loc, &decl); | |
03118c21 | 14315 | Btype* expr_btype = etype->get_backend(gogo); |
02c19a1a | 14316 | |
ea664253 | 14317 | Bexpression* bexpr = this->expr_->get_backend(context); |
03118c21 | 14318 | |
14319 | // If this assignment needs a write barrier, call typedmemmove. We | |
14320 | // don't do this in the write barrier pass because in some cases | |
14321 | // backend conversion can introduce new Heap_expression values. | |
14322 | Bstatement* assn; | |
14323 | if (!etype->has_pointer()) | |
14324 | { | |
14325 | space = gogo->backend()->var_expression(space_temp, VE_lvalue, loc); | |
14326 | Bexpression* ref = | |
14327 | gogo->backend()->indirect_expression(expr_btype, space, true, loc); | |
14328 | assn = gogo->backend()->assignment_statement(fndecl, ref, bexpr, loc); | |
14329 | } | |
14330 | else | |
14331 | { | |
14332 | Bstatement* edecl; | |
14333 | Bvariable* btemp = | |
14334 | gogo->backend()->temporary_variable(fndecl, context->bblock(), | |
14335 | expr_btype, bexpr, true, loc, | |
14336 | &edecl); | |
14337 | Bexpression* btempref = gogo->backend()->var_expression(btemp, | |
14338 | VE_lvalue, loc); | |
14339 | Bexpression* addr = gogo->backend()->address_expression(btempref, loc); | |
14340 | ||
14341 | Expression* td = Expression::make_type_descriptor(etype, loc); | |
14342 | Type* etype_ptr = Type::make_pointer_type(etype); | |
14343 | space = gogo->backend()->var_expression(space_temp, VE_rvalue, loc); | |
14344 | Expression* elhs = Expression::make_backend(space, etype_ptr, loc); | |
14345 | Expression* erhs = Expression::make_backend(addr, etype_ptr, loc); | |
14346 | Expression* call = Runtime::make_call(Runtime::TYPEDMEMMOVE, loc, 3, | |
14347 | td, elhs, erhs); | |
14348 | Bexpression* bcall = call->get_backend(context); | |
14349 | Bstatement* s = gogo->backend()->expression_statement(fndecl, bcall); | |
14350 | assn = gogo->backend()->compound_statement(edecl, s); | |
14351 | } | |
02c19a1a | 14352 | decl = gogo->backend()->compound_statement(decl, assn); |
d4e6573e | 14353 | space = gogo->backend()->var_expression(space_temp, VE_rvalue, loc); |
ea664253 | 14354 | return gogo->backend()->compound_expression(decl, space, loc); |
e440a328 | 14355 | } |
14356 | ||
2c809f8f | 14357 | // Dump ast representation for a heap expression. |
d751bb78 | 14358 | |
14359 | void | |
2c809f8f | 14360 | Heap_expression::do_dump_expression( |
d751bb78 | 14361 | Ast_dump_context* ast_dump_context) const |
14362 | { | |
14363 | ast_dump_context->ostream() << "&("; | |
14364 | ast_dump_context->dump_expression(this->expr_); | |
14365 | ast_dump_context->ostream() << ")"; | |
14366 | } | |
14367 | ||
2c809f8f | 14368 | // Allocate an expression on the heap. |
e440a328 | 14369 | |
14370 | Expression* | |
2c809f8f | 14371 | Expression::make_heap_expression(Expression* expr, Location location) |
e440a328 | 14372 | { |
2c809f8f | 14373 | return new Heap_expression(expr, location); |
e440a328 | 14374 | } |
14375 | ||
14376 | // Class Receive_expression. | |
14377 | ||
14378 | // Return the type of a receive expression. | |
14379 | ||
14380 | Type* | |
14381 | Receive_expression::do_type() | |
14382 | { | |
e429e3bd | 14383 | if (this->is_error_expression()) |
14384 | return Type::make_error_type(); | |
e440a328 | 14385 | Channel_type* channel_type = this->channel_->type()->channel_type(); |
14386 | if (channel_type == NULL) | |
e429e3bd | 14387 | { |
14388 | this->report_error(_("expected channel")); | |
14389 | return Type::make_error_type(); | |
14390 | } | |
e440a328 | 14391 | return channel_type->element_type(); |
14392 | } | |
14393 | ||
14394 | // Check types for a receive expression. | |
14395 | ||
14396 | void | |
14397 | Receive_expression::do_check_types(Gogo*) | |
14398 | { | |
14399 | Type* type = this->channel_->type(); | |
5c13bd80 | 14400 | if (type->is_error()) |
e440a328 | 14401 | { |
e429e3bd | 14402 | go_assert(saw_errors()); |
e440a328 | 14403 | this->set_is_error(); |
14404 | return; | |
14405 | } | |
14406 | if (type->channel_type() == NULL) | |
14407 | { | |
14408 | this->report_error(_("expected channel")); | |
14409 | return; | |
14410 | } | |
14411 | if (!type->channel_type()->may_receive()) | |
14412 | { | |
14413 | this->report_error(_("invalid receive on send-only channel")); | |
14414 | return; | |
14415 | } | |
14416 | } | |
14417 | ||
2c809f8f | 14418 | // Flattening for receive expressions creates a temporary variable to store |
14419 | // received data in for receives. | |
14420 | ||
14421 | Expression* | |
14422 | Receive_expression::do_flatten(Gogo*, Named_object*, | |
14423 | Statement_inserter* inserter) | |
14424 | { | |
14425 | Channel_type* channel_type = this->channel_->type()->channel_type(); | |
14426 | if (channel_type == NULL) | |
14427 | { | |
14428 | go_assert(saw_errors()); | |
14429 | return this; | |
14430 | } | |
5bf8be8b | 14431 | else if (this->channel_->is_error_expression()) |
14432 | { | |
14433 | go_assert(saw_errors()); | |
14434 | return Expression::make_error(this->location()); | |
14435 | } | |
2c809f8f | 14436 | |
14437 | Type* element_type = channel_type->element_type(); | |
14438 | if (this->temp_receiver_ == NULL) | |
14439 | { | |
14440 | this->temp_receiver_ = Statement::make_temporary(element_type, NULL, | |
14441 | this->location()); | |
14442 | this->temp_receiver_->set_is_address_taken(); | |
14443 | inserter->insert(this->temp_receiver_); | |
14444 | } | |
14445 | ||
14446 | return this; | |
14447 | } | |
14448 | ||
ea664253 | 14449 | // Get the backend representation for a receive expression. |
e440a328 | 14450 | |
ea664253 | 14451 | Bexpression* |
14452 | Receive_expression::do_get_backend(Translate_context* context) | |
e440a328 | 14453 | { |
f24f10bb | 14454 | Location loc = this->location(); |
14455 | ||
e440a328 | 14456 | Channel_type* channel_type = this->channel_->type()->channel_type(); |
5b8368f4 | 14457 | if (channel_type == NULL) |
14458 | { | |
c484d925 | 14459 | go_assert(this->channel_->type()->is_error()); |
ea664253 | 14460 | return context->backend()->error_expression(); |
5b8368f4 | 14461 | } |
f24f10bb | 14462 | Expression* td = Expression::make_type_descriptor(channel_type, loc); |
e440a328 | 14463 | |
2c809f8f | 14464 | Expression* recv_ref = |
14465 | Expression::make_temporary_reference(this->temp_receiver_, loc); | |
14466 | Expression* recv_addr = | |
14467 | Expression::make_temporary_reference(this->temp_receiver_, loc); | |
14468 | recv_addr = Expression::make_unary(OPERATOR_AND, recv_addr, loc); | |
132ed071 | 14469 | Expression* recv = Runtime::make_call(Runtime::CHANRECV1, loc, 3, |
14470 | td, this->channel_, recv_addr); | |
ea664253 | 14471 | return Expression::make_compound(recv, recv_ref, loc)->get_backend(context); |
e440a328 | 14472 | } |
14473 | ||
d751bb78 | 14474 | // Dump ast representation for a receive expression. |
14475 | ||
14476 | void | |
14477 | Receive_expression::do_dump_expression(Ast_dump_context* ast_dump_context) const | |
14478 | { | |
14479 | ast_dump_context->ostream() << " <- " ; | |
14480 | ast_dump_context->dump_expression(channel_); | |
14481 | } | |
14482 | ||
e440a328 | 14483 | // Make a receive expression. |
14484 | ||
14485 | Receive_expression* | |
b13c66cd | 14486 | Expression::make_receive(Expression* channel, Location location) |
e440a328 | 14487 | { |
14488 | return new Receive_expression(channel, location); | |
14489 | } | |
14490 | ||
e440a328 | 14491 | // An expression which evaluates to a pointer to the type descriptor |
14492 | // of a type. | |
14493 | ||
14494 | class Type_descriptor_expression : public Expression | |
14495 | { | |
14496 | public: | |
b13c66cd | 14497 | Type_descriptor_expression(Type* type, Location location) |
e440a328 | 14498 | : Expression(EXPRESSION_TYPE_DESCRIPTOR, location), |
14499 | type_(type) | |
14500 | { } | |
14501 | ||
14502 | protected: | |
4b686186 | 14503 | int |
14504 | do_traverse(Traverse*); | |
14505 | ||
e440a328 | 14506 | Type* |
14507 | do_type() | |
14508 | { return Type::make_type_descriptor_ptr_type(); } | |
14509 | ||
f9ca30f9 | 14510 | bool |
3ae06f68 | 14511 | do_is_static_initializer() const |
f9ca30f9 | 14512 | { return true; } |
14513 | ||
e440a328 | 14514 | void |
14515 | do_determine_type(const Type_context*) | |
14516 | { } | |
14517 | ||
14518 | Expression* | |
14519 | do_copy() | |
14520 | { return this; } | |
14521 | ||
ea664253 | 14522 | Bexpression* |
14523 | do_get_backend(Translate_context* context) | |
a1d23b41 | 14524 | { |
ea664253 | 14525 | return this->type_->type_descriptor_pointer(context->gogo(), |
14526 | this->location()); | |
a1d23b41 | 14527 | } |
e440a328 | 14528 | |
d751bb78 | 14529 | void |
14530 | do_dump_expression(Ast_dump_context*) const; | |
14531 | ||
e440a328 | 14532 | private: |
14533 | // The type for which this is the descriptor. | |
14534 | Type* type_; | |
14535 | }; | |
14536 | ||
4b686186 | 14537 | int |
14538 | Type_descriptor_expression::do_traverse(Traverse* traverse) | |
14539 | { | |
14540 | if (Type::traverse(this->type_, traverse) == TRAVERSE_EXIT) | |
14541 | return TRAVERSE_EXIT; | |
14542 | return TRAVERSE_CONTINUE; | |
14543 | } | |
14544 | ||
d751bb78 | 14545 | // Dump ast representation for a type descriptor expression. |
14546 | ||
14547 | void | |
14548 | Type_descriptor_expression::do_dump_expression( | |
14549 | Ast_dump_context* ast_dump_context) const | |
14550 | { | |
14551 | ast_dump_context->dump_type(this->type_); | |
14552 | } | |
14553 | ||
e440a328 | 14554 | // Make a type descriptor expression. |
14555 | ||
14556 | Expression* | |
b13c66cd | 14557 | Expression::make_type_descriptor(Type* type, Location location) |
e440a328 | 14558 | { |
14559 | return new Type_descriptor_expression(type, location); | |
14560 | } | |
14561 | ||
aa5ae575 | 14562 | // An expression which evaluates to a pointer to the Garbage Collection symbol |
14563 | // of a type. | |
14564 | ||
14565 | class GC_symbol_expression : public Expression | |
14566 | { | |
14567 | public: | |
14568 | GC_symbol_expression(Type* type) | |
14569 | : Expression(EXPRESSION_GC_SYMBOL, Linemap::predeclared_location()), | |
14570 | type_(type) | |
14571 | {} | |
14572 | ||
14573 | protected: | |
14574 | Type* | |
14575 | do_type() | |
03118c21 | 14576 | { return Type::make_pointer_type(Type::lookup_integer_type("uint8")); } |
aa5ae575 | 14577 | |
14578 | bool | |
3ae06f68 | 14579 | do_is_static_initializer() const |
aa5ae575 | 14580 | { return true; } |
14581 | ||
14582 | void | |
14583 | do_determine_type(const Type_context*) | |
14584 | { } | |
14585 | ||
14586 | Expression* | |
14587 | do_copy() | |
14588 | { return this; } | |
14589 | ||
14590 | Bexpression* | |
14591 | do_get_backend(Translate_context* context) | |
14592 | { return this->type_->gc_symbol_pointer(context->gogo()); } | |
14593 | ||
14594 | void | |
14595 | do_dump_expression(Ast_dump_context*) const; | |
14596 | ||
14597 | private: | |
14598 | // The type which this gc symbol describes. | |
14599 | Type* type_; | |
14600 | }; | |
14601 | ||
14602 | // Dump ast representation for a gc symbol expression. | |
14603 | ||
14604 | void | |
14605 | GC_symbol_expression::do_dump_expression( | |
14606 | Ast_dump_context* ast_dump_context) const | |
14607 | { | |
14608 | ast_dump_context->ostream() << "gcdata("; | |
14609 | ast_dump_context->dump_type(this->type_); | |
14610 | ast_dump_context->ostream() << ")"; | |
14611 | } | |
14612 | ||
14613 | // Make a gc symbol expression. | |
14614 | ||
14615 | Expression* | |
14616 | Expression::make_gc_symbol(Type* type) | |
14617 | { | |
14618 | return new GC_symbol_expression(type); | |
14619 | } | |
14620 | ||
03118c21 | 14621 | // An expression that evaluates to a pointer to a symbol holding the |
14622 | // ptrmask data of a type. | |
14623 | ||
14624 | class Ptrmask_symbol_expression : public Expression | |
14625 | { | |
14626 | public: | |
14627 | Ptrmask_symbol_expression(Type* type) | |
14628 | : Expression(EXPRESSION_PTRMASK_SYMBOL, Linemap::predeclared_location()), | |
14629 | type_(type) | |
14630 | {} | |
14631 | ||
14632 | protected: | |
14633 | Type* | |
14634 | do_type() | |
14635 | { return Type::make_pointer_type(Type::lookup_integer_type("uint8")); } | |
14636 | ||
14637 | bool | |
14638 | do_is_static_initializer() const | |
14639 | { return true; } | |
14640 | ||
14641 | void | |
14642 | do_determine_type(const Type_context*) | |
14643 | { } | |
14644 | ||
14645 | Expression* | |
14646 | do_copy() | |
14647 | { return this; } | |
14648 | ||
14649 | Bexpression* | |
14650 | do_get_backend(Translate_context*); | |
14651 | ||
14652 | void | |
14653 | do_dump_expression(Ast_dump_context*) const; | |
14654 | ||
14655 | private: | |
14656 | // The type that this ptrmask symbol describes. | |
14657 | Type* type_; | |
14658 | }; | |
14659 | ||
14660 | // Return the ptrmask variable. | |
14661 | ||
14662 | Bexpression* | |
14663 | Ptrmask_symbol_expression::do_get_backend(Translate_context* context) | |
14664 | { | |
14665 | Gogo* gogo = context->gogo(); | |
14666 | ||
14667 | // If this type does not need a gcprog, then we can use the standard | |
14668 | // GC symbol. | |
14669 | int64_t ptrsize, ptrdata; | |
14670 | if (!this->type_->needs_gcprog(gogo, &ptrsize, &ptrdata)) | |
14671 | return this->type_->gc_symbol_pointer(gogo); | |
14672 | ||
14673 | // Otherwise we have to build a ptrmask variable, and return a | |
14674 | // pointer to it. | |
14675 | ||
14676 | Bvariable* bvar = this->type_->gc_ptrmask_var(gogo, ptrsize, ptrdata); | |
14677 | Location bloc = Linemap::predeclared_location(); | |
14678 | Bexpression* bref = gogo->backend()->var_expression(bvar, VE_rvalue, bloc); | |
14679 | Bexpression* baddr = gogo->backend()->address_expression(bref, bloc); | |
14680 | ||
14681 | Type* uint8_type = Type::lookup_integer_type("uint8"); | |
14682 | Type* pointer_uint8_type = Type::make_pointer_type(uint8_type); | |
14683 | Btype* ubtype = pointer_uint8_type->get_backend(gogo); | |
14684 | return gogo->backend()->convert_expression(ubtype, baddr, bloc); | |
14685 | } | |
14686 | ||
14687 | // Dump AST for a ptrmask symbol expression. | |
14688 | ||
14689 | void | |
14690 | Ptrmask_symbol_expression::do_dump_expression( | |
14691 | Ast_dump_context* ast_dump_context) const | |
14692 | { | |
14693 | ast_dump_context->ostream() << "ptrmask("; | |
14694 | ast_dump_context->dump_type(this->type_); | |
14695 | ast_dump_context->ostream() << ")"; | |
14696 | } | |
14697 | ||
14698 | // Make a ptrmask symbol expression. | |
14699 | ||
14700 | Expression* | |
14701 | Expression::make_ptrmask_symbol(Type* type) | |
14702 | { | |
14703 | return new Ptrmask_symbol_expression(type); | |
14704 | } | |
14705 | ||
e440a328 | 14706 | // An expression which evaluates to some characteristic of a type. |
14707 | // This is only used to initialize fields of a type descriptor. Using | |
14708 | // a new expression class is slightly inefficient but gives us a good | |
14709 | // separation between the frontend and the middle-end with regard to | |
14710 | // how types are laid out. | |
14711 | ||
14712 | class Type_info_expression : public Expression | |
14713 | { | |
14714 | public: | |
14715 | Type_info_expression(Type* type, Type_info type_info) | |
b13c66cd | 14716 | : Expression(EXPRESSION_TYPE_INFO, Linemap::predeclared_location()), |
e440a328 | 14717 | type_(type), type_info_(type_info) |
14718 | { } | |
14719 | ||
14720 | protected: | |
0e168074 | 14721 | bool |
3ae06f68 | 14722 | do_is_static_initializer() const |
0e168074 | 14723 | { return true; } |
14724 | ||
e440a328 | 14725 | Type* |
14726 | do_type(); | |
14727 | ||
14728 | void | |
14729 | do_determine_type(const Type_context*) | |
14730 | { } | |
14731 | ||
14732 | Expression* | |
14733 | do_copy() | |
14734 | { return this; } | |
14735 | ||
ea664253 | 14736 | Bexpression* |
14737 | do_get_backend(Translate_context* context); | |
e440a328 | 14738 | |
d751bb78 | 14739 | void |
14740 | do_dump_expression(Ast_dump_context*) const; | |
14741 | ||
e440a328 | 14742 | private: |
14743 | // The type for which we are getting information. | |
14744 | Type* type_; | |
14745 | // What information we want. | |
14746 | Type_info type_info_; | |
14747 | }; | |
14748 | ||
14749 | // The type is chosen to match what the type descriptor struct | |
14750 | // expects. | |
14751 | ||
14752 | Type* | |
14753 | Type_info_expression::do_type() | |
14754 | { | |
14755 | switch (this->type_info_) | |
14756 | { | |
14757 | case TYPE_INFO_SIZE: | |
03118c21 | 14758 | case TYPE_INFO_BACKEND_PTRDATA: |
14759 | case TYPE_INFO_DESCRIPTOR_PTRDATA: | |
e440a328 | 14760 | return Type::lookup_integer_type("uintptr"); |
14761 | case TYPE_INFO_ALIGNMENT: | |
14762 | case TYPE_INFO_FIELD_ALIGNMENT: | |
14763 | return Type::lookup_integer_type("uint8"); | |
14764 | default: | |
c3e6f413 | 14765 | go_unreachable(); |
e440a328 | 14766 | } |
14767 | } | |
14768 | ||
ea664253 | 14769 | // Return the backend representation for type information. |
e440a328 | 14770 | |
ea664253 | 14771 | Bexpression* |
14772 | Type_info_expression::do_get_backend(Translate_context* context) | |
e440a328 | 14773 | { |
927a01eb | 14774 | Gogo* gogo = context->gogo(); |
2a305b85 | 14775 | bool ok = true; |
3f378015 | 14776 | int64_t val; |
927a01eb | 14777 | switch (this->type_info_) |
e440a328 | 14778 | { |
927a01eb | 14779 | case TYPE_INFO_SIZE: |
2a305b85 | 14780 | ok = this->type_->backend_type_size(gogo, &val); |
927a01eb | 14781 | break; |
14782 | case TYPE_INFO_ALIGNMENT: | |
2a305b85 | 14783 | ok = this->type_->backend_type_align(gogo, &val); |
927a01eb | 14784 | break; |
14785 | case TYPE_INFO_FIELD_ALIGNMENT: | |
2a305b85 | 14786 | ok = this->type_->backend_type_field_align(gogo, &val); |
927a01eb | 14787 | break; |
03118c21 | 14788 | case TYPE_INFO_BACKEND_PTRDATA: |
14789 | ok = this->type_->backend_type_ptrdata(gogo, &val); | |
14790 | break; | |
14791 | case TYPE_INFO_DESCRIPTOR_PTRDATA: | |
14792 | ok = this->type_->descriptor_ptrdata(gogo, &val); | |
14793 | break; | |
927a01eb | 14794 | default: |
14795 | go_unreachable(); | |
e440a328 | 14796 | } |
2a305b85 | 14797 | if (!ok) |
14798 | { | |
14799 | go_assert(saw_errors()); | |
14800 | return gogo->backend()->error_expression(); | |
14801 | } | |
3f378015 | 14802 | Expression* e = Expression::make_integer_int64(val, this->type(), |
14803 | this->location()); | |
14804 | return e->get_backend(context); | |
e440a328 | 14805 | } |
14806 | ||
d751bb78 | 14807 | // Dump ast representation for a type info expression. |
14808 | ||
14809 | void | |
14810 | Type_info_expression::do_dump_expression( | |
14811 | Ast_dump_context* ast_dump_context) const | |
14812 | { | |
14813 | ast_dump_context->ostream() << "typeinfo("; | |
14814 | ast_dump_context->dump_type(this->type_); | |
14815 | ast_dump_context->ostream() << ","; | |
14816 | ast_dump_context->ostream() << | |
14817 | (this->type_info_ == TYPE_INFO_ALIGNMENT ? "alignment" | |
14818 | : this->type_info_ == TYPE_INFO_FIELD_ALIGNMENT ? "field alignment" | |
03118c21 | 14819 | : this->type_info_ == TYPE_INFO_SIZE ? "size" |
14820 | : this->type_info_ == TYPE_INFO_BACKEND_PTRDATA ? "backend_ptrdata" | |
14821 | : this->type_info_ == TYPE_INFO_DESCRIPTOR_PTRDATA ? "descriptor_ptrdata" | |
d751bb78 | 14822 | : "unknown"); |
14823 | ast_dump_context->ostream() << ")"; | |
14824 | } | |
14825 | ||
e440a328 | 14826 | // Make a type info expression. |
14827 | ||
14828 | Expression* | |
14829 | Expression::make_type_info(Type* type, Type_info type_info) | |
14830 | { | |
14831 | return new Type_info_expression(type, type_info); | |
14832 | } | |
14833 | ||
35a54f17 | 14834 | // An expression that evaluates to some characteristic of a slice. |
14835 | // This is used when indexing, bound-checking, or nil checking a slice. | |
14836 | ||
14837 | class Slice_info_expression : public Expression | |
14838 | { | |
14839 | public: | |
14840 | Slice_info_expression(Expression* slice, Slice_info slice_info, | |
14841 | Location location) | |
14842 | : Expression(EXPRESSION_SLICE_INFO, location), | |
14843 | slice_(slice), slice_info_(slice_info) | |
14844 | { } | |
14845 | ||
14846 | protected: | |
14847 | Type* | |
14848 | do_type(); | |
14849 | ||
14850 | void | |
14851 | do_determine_type(const Type_context*) | |
14852 | { } | |
14853 | ||
14854 | Expression* | |
14855 | do_copy() | |
14856 | { | |
14857 | return new Slice_info_expression(this->slice_->copy(), this->slice_info_, | |
14858 | this->location()); | |
14859 | } | |
14860 | ||
ea664253 | 14861 | Bexpression* |
14862 | do_get_backend(Translate_context* context); | |
35a54f17 | 14863 | |
14864 | void | |
14865 | do_dump_expression(Ast_dump_context*) const; | |
14866 | ||
14867 | void | |
14868 | do_issue_nil_check() | |
14869 | { this->slice_->issue_nil_check(); } | |
14870 | ||
14871 | private: | |
14872 | // The slice for which we are getting information. | |
14873 | Expression* slice_; | |
14874 | // What information we want. | |
14875 | Slice_info slice_info_; | |
14876 | }; | |
14877 | ||
14878 | // Return the type of the slice info. | |
14879 | ||
14880 | Type* | |
14881 | Slice_info_expression::do_type() | |
14882 | { | |
14883 | switch (this->slice_info_) | |
14884 | { | |
14885 | case SLICE_INFO_VALUE_POINTER: | |
14886 | return Type::make_pointer_type( | |
14887 | this->slice_->type()->array_type()->element_type()); | |
14888 | case SLICE_INFO_LENGTH: | |
14889 | case SLICE_INFO_CAPACITY: | |
14890 | return Type::lookup_integer_type("int"); | |
14891 | default: | |
14892 | go_unreachable(); | |
14893 | } | |
14894 | } | |
14895 | ||
ea664253 | 14896 | // Return the backend information for slice information. |
35a54f17 | 14897 | |
ea664253 | 14898 | Bexpression* |
14899 | Slice_info_expression::do_get_backend(Translate_context* context) | |
35a54f17 | 14900 | { |
14901 | Gogo* gogo = context->gogo(); | |
ea664253 | 14902 | Bexpression* bslice = this->slice_->get_backend(context); |
35a54f17 | 14903 | switch (this->slice_info_) |
14904 | { | |
14905 | case SLICE_INFO_VALUE_POINTER: | |
14906 | case SLICE_INFO_LENGTH: | |
14907 | case SLICE_INFO_CAPACITY: | |
ea664253 | 14908 | return gogo->backend()->struct_field_expression(bslice, this->slice_info_, |
14909 | this->location()); | |
35a54f17 | 14910 | break; |
14911 | default: | |
14912 | go_unreachable(); | |
14913 | } | |
35a54f17 | 14914 | } |
14915 | ||
14916 | // Dump ast representation for a type info expression. | |
14917 | ||
14918 | void | |
14919 | Slice_info_expression::do_dump_expression( | |
14920 | Ast_dump_context* ast_dump_context) const | |
14921 | { | |
14922 | ast_dump_context->ostream() << "sliceinfo("; | |
14923 | this->slice_->dump_expression(ast_dump_context); | |
14924 | ast_dump_context->ostream() << ","; | |
14925 | ast_dump_context->ostream() << | |
14926 | (this->slice_info_ == SLICE_INFO_VALUE_POINTER ? "values" | |
14927 | : this->slice_info_ == SLICE_INFO_LENGTH ? "length" | |
14928 | : this->slice_info_ == SLICE_INFO_CAPACITY ? "capacity " | |
14929 | : "unknown"); | |
14930 | ast_dump_context->ostream() << ")"; | |
14931 | } | |
14932 | ||
14933 | // Make a slice info expression. | |
14934 | ||
14935 | Expression* | |
14936 | Expression::make_slice_info(Expression* slice, Slice_info slice_info, | |
14937 | Location location) | |
14938 | { | |
14939 | return new Slice_info_expression(slice, slice_info, location); | |
14940 | } | |
14941 | ||
2c809f8f | 14942 | // An expression that represents a slice value: a struct with value pointer, |
14943 | // length, and capacity fields. | |
14944 | ||
14945 | class Slice_value_expression : public Expression | |
14946 | { | |
14947 | public: | |
14948 | Slice_value_expression(Type* type, Expression* valptr, Expression* len, | |
14949 | Expression* cap, Location location) | |
14950 | : Expression(EXPRESSION_SLICE_VALUE, location), | |
14951 | type_(type), valptr_(valptr), len_(len), cap_(cap) | |
14952 | { } | |
14953 | ||
14954 | protected: | |
14955 | int | |
14956 | do_traverse(Traverse*); | |
14957 | ||
14958 | Type* | |
14959 | do_type() | |
14960 | { return this->type_; } | |
14961 | ||
14962 | void | |
14963 | do_determine_type(const Type_context*) | |
14964 | { go_unreachable(); } | |
14965 | ||
14966 | Expression* | |
14967 | do_copy() | |
14968 | { | |
14969 | return new Slice_value_expression(this->type_, this->valptr_->copy(), | |
14970 | this->len_->copy(), this->cap_->copy(), | |
14971 | this->location()); | |
14972 | } | |
14973 | ||
ea664253 | 14974 | Bexpression* |
14975 | do_get_backend(Translate_context* context); | |
2c809f8f | 14976 | |
14977 | void | |
14978 | do_dump_expression(Ast_dump_context*) const; | |
14979 | ||
14980 | private: | |
14981 | // The type of the slice value. | |
14982 | Type* type_; | |
14983 | // The pointer to the values in the slice. | |
14984 | Expression* valptr_; | |
14985 | // The length of the slice. | |
14986 | Expression* len_; | |
14987 | // The capacity of the slice. | |
14988 | Expression* cap_; | |
14989 | }; | |
14990 | ||
14991 | int | |
14992 | Slice_value_expression::do_traverse(Traverse* traverse) | |
14993 | { | |
55e8ba6a | 14994 | if (Type::traverse(this->type_, traverse) == TRAVERSE_EXIT |
14995 | || Expression::traverse(&this->valptr_, traverse) == TRAVERSE_EXIT | |
2c809f8f | 14996 | || Expression::traverse(&this->len_, traverse) == TRAVERSE_EXIT |
14997 | || Expression::traverse(&this->cap_, traverse) == TRAVERSE_EXIT) | |
14998 | return TRAVERSE_EXIT; | |
14999 | return TRAVERSE_CONTINUE; | |
15000 | } | |
15001 | ||
ea664253 | 15002 | Bexpression* |
15003 | Slice_value_expression::do_get_backend(Translate_context* context) | |
2c809f8f | 15004 | { |
15005 | std::vector<Bexpression*> vals(3); | |
ea664253 | 15006 | vals[0] = this->valptr_->get_backend(context); |
15007 | vals[1] = this->len_->get_backend(context); | |
15008 | vals[2] = this->cap_->get_backend(context); | |
2c809f8f | 15009 | |
15010 | Gogo* gogo = context->gogo(); | |
15011 | Btype* btype = this->type_->get_backend(gogo); | |
ea664253 | 15012 | return gogo->backend()->constructor_expression(btype, vals, this->location()); |
2c809f8f | 15013 | } |
15014 | ||
15015 | void | |
15016 | Slice_value_expression::do_dump_expression( | |
15017 | Ast_dump_context* ast_dump_context) const | |
15018 | { | |
15019 | ast_dump_context->ostream() << "slicevalue("; | |
15020 | ast_dump_context->ostream() << "values: "; | |
15021 | this->valptr_->dump_expression(ast_dump_context); | |
15022 | ast_dump_context->ostream() << ", length: "; | |
15023 | this->len_->dump_expression(ast_dump_context); | |
15024 | ast_dump_context->ostream() << ", capacity: "; | |
15025 | this->cap_->dump_expression(ast_dump_context); | |
15026 | ast_dump_context->ostream() << ")"; | |
15027 | } | |
15028 | ||
15029 | Expression* | |
15030 | Expression::make_slice_value(Type* at, Expression* valptr, Expression* len, | |
15031 | Expression* cap, Location location) | |
15032 | { | |
15033 | go_assert(at->is_slice_type()); | |
15034 | return new Slice_value_expression(at, valptr, len, cap, location); | |
15035 | } | |
2387f644 | 15036 | |
15037 | // An expression that evaluates to some characteristic of a non-empty interface. | |
15038 | // This is used to access the method table or underlying object of an interface. | |
15039 | ||
15040 | class Interface_info_expression : public Expression | |
15041 | { | |
15042 | public: | |
15043 | Interface_info_expression(Expression* iface, Interface_info iface_info, | |
2c809f8f | 15044 | Location location) |
2387f644 | 15045 | : Expression(EXPRESSION_INTERFACE_INFO, location), |
15046 | iface_(iface), iface_info_(iface_info) | |
15047 | { } | |
15048 | ||
15049 | protected: | |
15050 | Type* | |
15051 | do_type(); | |
15052 | ||
15053 | void | |
15054 | do_determine_type(const Type_context*) | |
15055 | { } | |
15056 | ||
15057 | Expression* | |
15058 | do_copy() | |
15059 | { | |
15060 | return new Interface_info_expression(this->iface_->copy(), | |
15061 | this->iface_info_, this->location()); | |
15062 | } | |
15063 | ||
ea664253 | 15064 | Bexpression* |
15065 | do_get_backend(Translate_context* context); | |
2387f644 | 15066 | |
15067 | void | |
15068 | do_dump_expression(Ast_dump_context*) const; | |
15069 | ||
15070 | void | |
15071 | do_issue_nil_check() | |
15072 | { this->iface_->issue_nil_check(); } | |
15073 | ||
15074 | private: | |
15075 | // The interface for which we are getting information. | |
15076 | Expression* iface_; | |
15077 | // What information we want. | |
15078 | Interface_info iface_info_; | |
15079 | }; | |
15080 | ||
15081 | // Return the type of the interface info. | |
15082 | ||
15083 | Type* | |
15084 | Interface_info_expression::do_type() | |
15085 | { | |
15086 | switch (this->iface_info_) | |
15087 | { | |
15088 | case INTERFACE_INFO_METHODS: | |
15089 | { | |
625d3118 | 15090 | typedef Unordered_map(Interface_type*, Type*) Hashtable; |
15091 | static Hashtable result_types; | |
15092 | ||
15093 | Interface_type* itype = this->iface_->type()->interface_type(); | |
15094 | ||
15095 | Hashtable::const_iterator p = result_types.find(itype); | |
15096 | if (p != result_types.end()) | |
15097 | return p->second; | |
15098 | ||
2c809f8f | 15099 | Type* pdt = Type::make_type_descriptor_ptr_type(); |
625d3118 | 15100 | if (itype->is_empty()) |
15101 | { | |
15102 | result_types[itype] = pdt; | |
15103 | return pdt; | |
15104 | } | |
2c809f8f | 15105 | |
2387f644 | 15106 | Location loc = this->location(); |
15107 | Struct_field_list* sfl = new Struct_field_list(); | |
2387f644 | 15108 | sfl->push_back( |
15109 | Struct_field(Typed_identifier("__type_descriptor", pdt, loc))); | |
15110 | ||
2387f644 | 15111 | for (Typed_identifier_list::const_iterator p = itype->methods()->begin(); |
15112 | p != itype->methods()->end(); | |
15113 | ++p) | |
15114 | { | |
15115 | Function_type* ft = p->type()->function_type(); | |
15116 | go_assert(ft->receiver() == NULL); | |
15117 | ||
15118 | const Typed_identifier_list* params = ft->parameters(); | |
15119 | Typed_identifier_list* mparams = new Typed_identifier_list(); | |
15120 | if (params != NULL) | |
15121 | mparams->reserve(params->size() + 1); | |
15122 | Type* vt = Type::make_pointer_type(Type::make_void_type()); | |
15123 | mparams->push_back(Typed_identifier("", vt, ft->location())); | |
15124 | if (params != NULL) | |
15125 | { | |
15126 | for (Typed_identifier_list::const_iterator pp = params->begin(); | |
15127 | pp != params->end(); | |
15128 | ++pp) | |
15129 | mparams->push_back(*pp); | |
15130 | } | |
15131 | ||
15132 | Typed_identifier_list* mresults = (ft->results() == NULL | |
15133 | ? NULL | |
15134 | : ft->results()->copy()); | |
15135 | Backend_function_type* mft = | |
15136 | Type::make_backend_function_type(NULL, mparams, mresults, | |
15137 | ft->location()); | |
15138 | ||
15139 | std::string fname = Gogo::unpack_hidden_name(p->name()); | |
15140 | sfl->push_back(Struct_field(Typed_identifier(fname, mft, loc))); | |
15141 | } | |
15142 | ||
6bf4793c | 15143 | Struct_type* st = Type::make_struct_type(sfl, loc); |
15144 | st->set_is_struct_incomparable(); | |
15145 | Pointer_type *pt = Type::make_pointer_type(st); | |
625d3118 | 15146 | result_types[itype] = pt; |
15147 | return pt; | |
2387f644 | 15148 | } |
15149 | case INTERFACE_INFO_OBJECT: | |
15150 | return Type::make_pointer_type(Type::make_void_type()); | |
15151 | default: | |
15152 | go_unreachable(); | |
15153 | } | |
15154 | } | |
15155 | ||
ea664253 | 15156 | // Return the backend representation for interface information. |
2387f644 | 15157 | |
ea664253 | 15158 | Bexpression* |
15159 | Interface_info_expression::do_get_backend(Translate_context* context) | |
2387f644 | 15160 | { |
15161 | Gogo* gogo = context->gogo(); | |
ea664253 | 15162 | Bexpression* biface = this->iface_->get_backend(context); |
2387f644 | 15163 | switch (this->iface_info_) |
15164 | { | |
15165 | case INTERFACE_INFO_METHODS: | |
15166 | case INTERFACE_INFO_OBJECT: | |
ea664253 | 15167 | return gogo->backend()->struct_field_expression(biface, this->iface_info_, |
15168 | this->location()); | |
2387f644 | 15169 | break; |
15170 | default: | |
15171 | go_unreachable(); | |
15172 | } | |
2387f644 | 15173 | } |
15174 | ||
15175 | // Dump ast representation for an interface info expression. | |
15176 | ||
15177 | void | |
15178 | Interface_info_expression::do_dump_expression( | |
15179 | Ast_dump_context* ast_dump_context) const | |
15180 | { | |
2c809f8f | 15181 | bool is_empty = this->iface_->type()->interface_type()->is_empty(); |
2387f644 | 15182 | ast_dump_context->ostream() << "interfaceinfo("; |
15183 | this->iface_->dump_expression(ast_dump_context); | |
15184 | ast_dump_context->ostream() << ","; | |
15185 | ast_dump_context->ostream() << | |
2c809f8f | 15186 | (this->iface_info_ == INTERFACE_INFO_METHODS && !is_empty ? "methods" |
15187 | : this->iface_info_ == INTERFACE_INFO_TYPE_DESCRIPTOR ? "type_descriptor" | |
2387f644 | 15188 | : this->iface_info_ == INTERFACE_INFO_OBJECT ? "object" |
15189 | : "unknown"); | |
15190 | ast_dump_context->ostream() << ")"; | |
15191 | } | |
15192 | ||
15193 | // Make an interface info expression. | |
15194 | ||
15195 | Expression* | |
15196 | Expression::make_interface_info(Expression* iface, Interface_info iface_info, | |
15197 | Location location) | |
15198 | { | |
15199 | return new Interface_info_expression(iface, iface_info, location); | |
15200 | } | |
15201 | ||
2c809f8f | 15202 | // An expression that represents an interface value. The first field is either |
15203 | // a type descriptor for an empty interface or a pointer to the interface method | |
15204 | // table for a non-empty interface. The second field is always the object. | |
15205 | ||
15206 | class Interface_value_expression : public Expression | |
15207 | { | |
15208 | public: | |
15209 | Interface_value_expression(Type* type, Expression* first_field, | |
15210 | Expression* obj, Location location) | |
15211 | : Expression(EXPRESSION_INTERFACE_VALUE, location), | |
15212 | type_(type), first_field_(first_field), obj_(obj) | |
15213 | { } | |
15214 | ||
15215 | protected: | |
15216 | int | |
15217 | do_traverse(Traverse*); | |
15218 | ||
15219 | Type* | |
15220 | do_type() | |
15221 | { return this->type_; } | |
15222 | ||
15223 | void | |
15224 | do_determine_type(const Type_context*) | |
15225 | { go_unreachable(); } | |
15226 | ||
15227 | Expression* | |
15228 | do_copy() | |
15229 | { | |
15230 | return new Interface_value_expression(this->type_, | |
15231 | this->first_field_->copy(), | |
15232 | this->obj_->copy(), this->location()); | |
15233 | } | |
15234 | ||
ea664253 | 15235 | Bexpression* |
15236 | do_get_backend(Translate_context* context); | |
2c809f8f | 15237 | |
15238 | void | |
15239 | do_dump_expression(Ast_dump_context*) const; | |
15240 | ||
15241 | private: | |
15242 | // The type of the interface value. | |
15243 | Type* type_; | |
15244 | // The first field of the interface (either a type descriptor or a pointer | |
15245 | // to the method table. | |
15246 | Expression* first_field_; | |
15247 | // The underlying object of the interface. | |
15248 | Expression* obj_; | |
15249 | }; | |
15250 | ||
15251 | int | |
15252 | Interface_value_expression::do_traverse(Traverse* traverse) | |
15253 | { | |
15254 | if (Expression::traverse(&this->first_field_, traverse) == TRAVERSE_EXIT | |
15255 | || Expression::traverse(&this->obj_, traverse) == TRAVERSE_EXIT) | |
15256 | return TRAVERSE_EXIT; | |
15257 | return TRAVERSE_CONTINUE; | |
15258 | } | |
15259 | ||
ea664253 | 15260 | Bexpression* |
15261 | Interface_value_expression::do_get_backend(Translate_context* context) | |
2c809f8f | 15262 | { |
15263 | std::vector<Bexpression*> vals(2); | |
ea664253 | 15264 | vals[0] = this->first_field_->get_backend(context); |
15265 | vals[1] = this->obj_->get_backend(context); | |
2c809f8f | 15266 | |
15267 | Gogo* gogo = context->gogo(); | |
15268 | Btype* btype = this->type_->get_backend(gogo); | |
ea664253 | 15269 | return gogo->backend()->constructor_expression(btype, vals, this->location()); |
2c809f8f | 15270 | } |
15271 | ||
15272 | void | |
15273 | Interface_value_expression::do_dump_expression( | |
15274 | Ast_dump_context* ast_dump_context) const | |
15275 | { | |
15276 | ast_dump_context->ostream() << "interfacevalue("; | |
15277 | ast_dump_context->ostream() << | |
15278 | (this->type_->interface_type()->is_empty() | |
15279 | ? "type_descriptor: " | |
15280 | : "methods: "); | |
15281 | this->first_field_->dump_expression(ast_dump_context); | |
15282 | ast_dump_context->ostream() << ", object: "; | |
15283 | this->obj_->dump_expression(ast_dump_context); | |
15284 | ast_dump_context->ostream() << ")"; | |
15285 | } | |
15286 | ||
15287 | Expression* | |
15288 | Expression::make_interface_value(Type* type, Expression* first_value, | |
15289 | Expression* object, Location location) | |
15290 | { | |
15291 | return new Interface_value_expression(type, first_value, object, location); | |
15292 | } | |
15293 | ||
15294 | // An interface method table for a pair of types: an interface type and a type | |
15295 | // that implements that interface. | |
15296 | ||
15297 | class Interface_mtable_expression : public Expression | |
15298 | { | |
15299 | public: | |
15300 | Interface_mtable_expression(Interface_type* itype, Type* type, | |
15301 | bool is_pointer, Location location) | |
15302 | : Expression(EXPRESSION_INTERFACE_MTABLE, location), | |
15303 | itype_(itype), type_(type), is_pointer_(is_pointer), | |
15304 | method_table_type_(NULL), bvar_(NULL) | |
15305 | { } | |
15306 | ||
15307 | protected: | |
15308 | int | |
15309 | do_traverse(Traverse*); | |
15310 | ||
15311 | Type* | |
15312 | do_type(); | |
15313 | ||
15314 | bool | |
3ae06f68 | 15315 | do_is_static_initializer() const |
2c809f8f | 15316 | { return true; } |
15317 | ||
15318 | void | |
15319 | do_determine_type(const Type_context*) | |
15320 | { go_unreachable(); } | |
15321 | ||
15322 | Expression* | |
15323 | do_copy() | |
15324 | { | |
15325 | return new Interface_mtable_expression(this->itype_, this->type_, | |
15326 | this->is_pointer_, this->location()); | |
15327 | } | |
15328 | ||
15329 | bool | |
15330 | do_is_addressable() const | |
15331 | { return true; } | |
15332 | ||
ea664253 | 15333 | Bexpression* |
15334 | do_get_backend(Translate_context* context); | |
2c809f8f | 15335 | |
15336 | void | |
15337 | do_dump_expression(Ast_dump_context*) const; | |
15338 | ||
15339 | private: | |
15340 | // The interface type for which the methods are defined. | |
15341 | Interface_type* itype_; | |
15342 | // The type to construct the interface method table for. | |
15343 | Type* type_; | |
15344 | // Whether this table contains the method set for the receiver type or the | |
15345 | // pointer receiver type. | |
15346 | bool is_pointer_; | |
15347 | // The type of the method table. | |
15348 | Type* method_table_type_; | |
15349 | // The backend variable that refers to the interface method table. | |
15350 | Bvariable* bvar_; | |
15351 | }; | |
15352 | ||
15353 | int | |
15354 | Interface_mtable_expression::do_traverse(Traverse* traverse) | |
15355 | { | |
15356 | if (Type::traverse(this->itype_, traverse) == TRAVERSE_EXIT | |
15357 | || Type::traverse(this->type_, traverse) == TRAVERSE_EXIT) | |
15358 | return TRAVERSE_EXIT; | |
15359 | return TRAVERSE_CONTINUE; | |
15360 | } | |
15361 | ||
15362 | Type* | |
15363 | Interface_mtable_expression::do_type() | |
15364 | { | |
15365 | if (this->method_table_type_ != NULL) | |
15366 | return this->method_table_type_; | |
15367 | ||
15368 | const Typed_identifier_list* interface_methods = this->itype_->methods(); | |
15369 | go_assert(!interface_methods->empty()); | |
15370 | ||
15371 | Struct_field_list* sfl = new Struct_field_list; | |
15372 | Typed_identifier tid("__type_descriptor", Type::make_type_descriptor_ptr_type(), | |
15373 | this->location()); | |
15374 | sfl->push_back(Struct_field(tid)); | |
15375 | for (Typed_identifier_list::const_iterator p = interface_methods->begin(); | |
15376 | p != interface_methods->end(); | |
15377 | ++p) | |
15378 | sfl->push_back(Struct_field(*p)); | |
6bf4793c | 15379 | Struct_type* st = Type::make_struct_type(sfl, this->location()); |
15380 | st->set_is_struct_incomparable(); | |
15381 | this->method_table_type_ = st; | |
2c809f8f | 15382 | return this->method_table_type_; |
15383 | } | |
15384 | ||
ea664253 | 15385 | Bexpression* |
15386 | Interface_mtable_expression::do_get_backend(Translate_context* context) | |
2c809f8f | 15387 | { |
15388 | Gogo* gogo = context->gogo(); | |
2c809f8f | 15389 | Location loc = Linemap::predeclared_location(); |
15390 | if (this->bvar_ != NULL) | |
d4e6573e | 15391 | return gogo->backend()->var_expression(this->bvar_, VE_rvalue, |
15392 | this->location()); | |
2c809f8f | 15393 | |
15394 | const Typed_identifier_list* interface_methods = this->itype_->methods(); | |
15395 | go_assert(!interface_methods->empty()); | |
15396 | ||
15397 | std::string mangled_name = ((this->is_pointer_ ? "__go_pimt__" : "__go_imt_") | |
15398 | + this->itype_->mangled_name(gogo) | |
15399 | + "__" | |
15400 | + this->type_->mangled_name(gogo)); | |
15401 | ||
15402 | // See whether this interface has any hidden methods. | |
15403 | bool has_hidden_methods = false; | |
15404 | for (Typed_identifier_list::const_iterator p = interface_methods->begin(); | |
15405 | p != interface_methods->end(); | |
15406 | ++p) | |
15407 | { | |
15408 | if (Gogo::is_hidden_name(p->name())) | |
15409 | { | |
15410 | has_hidden_methods = true; | |
15411 | break; | |
15412 | } | |
15413 | } | |
15414 | ||
15415 | // We already know that the named type is convertible to the | |
15416 | // interface. If the interface has hidden methods, and the named | |
15417 | // type is defined in a different package, then the interface | |
15418 | // conversion table will be defined by that other package. | |
15419 | if (has_hidden_methods | |
15420 | && this->type_->named_type() != NULL | |
15421 | && this->type_->named_type()->named_object()->package() != NULL) | |
15422 | { | |
15423 | Btype* btype = this->type()->get_backend(gogo); | |
438b4bec | 15424 | std::string asm_name(go_selectively_encode_id(mangled_name)); |
2c809f8f | 15425 | this->bvar_ = |
438b4bec | 15426 | gogo->backend()->immutable_struct_reference(mangled_name, asm_name, |
15427 | btype, loc); | |
d4e6573e | 15428 | return gogo->backend()->var_expression(this->bvar_, VE_rvalue, |
15429 | this->location()); | |
2c809f8f | 15430 | } |
15431 | ||
15432 | // The first element is the type descriptor. | |
15433 | Type* td_type; | |
15434 | if (!this->is_pointer_) | |
15435 | td_type = this->type_; | |
15436 | else | |
15437 | td_type = Type::make_pointer_type(this->type_); | |
15438 | ||
15439 | // Build an interface method table for a type: a type descriptor followed by a | |
15440 | // list of function pointers, one for each interface method. This is used for | |
15441 | // interfaces. | |
15442 | Expression_list* svals = new Expression_list(); | |
15443 | svals->push_back(Expression::make_type_descriptor(td_type, loc)); | |
15444 | ||
15445 | Named_type* nt = this->type_->named_type(); | |
15446 | Struct_type* st = this->type_->struct_type(); | |
15447 | go_assert(nt != NULL || st != NULL); | |
15448 | ||
15449 | for (Typed_identifier_list::const_iterator p = interface_methods->begin(); | |
15450 | p != interface_methods->end(); | |
15451 | ++p) | |
15452 | { | |
15453 | bool is_ambiguous; | |
15454 | Method* m; | |
15455 | if (nt != NULL) | |
15456 | m = nt->method_function(p->name(), &is_ambiguous); | |
15457 | else | |
15458 | m = st->method_function(p->name(), &is_ambiguous); | |
15459 | go_assert(m != NULL); | |
15460 | Named_object* no = m->named_object(); | |
15461 | ||
15462 | go_assert(no->is_function() || no->is_function_declaration()); | |
15463 | svals->push_back(Expression::make_func_code_reference(no, loc)); | |
15464 | } | |
15465 | ||
15466 | Btype* btype = this->type()->get_backend(gogo); | |
15467 | Expression* mtable = Expression::make_struct_composite_literal(this->type(), | |
15468 | svals, loc); | |
ea664253 | 15469 | Bexpression* ctor = mtable->get_backend(context); |
2c809f8f | 15470 | |
15471 | bool is_public = has_hidden_methods && this->type_->named_type() != NULL; | |
438b4bec | 15472 | std::string asm_name(go_selectively_encode_id(mangled_name)); |
15473 | this->bvar_ = gogo->backend()->immutable_struct(mangled_name, asm_name, false, | |
2c809f8f | 15474 | !is_public, btype, loc); |
15475 | gogo->backend()->immutable_struct_set_init(this->bvar_, mangled_name, false, | |
15476 | !is_public, btype, loc, ctor); | |
d4e6573e | 15477 | return gogo->backend()->var_expression(this->bvar_, VE_lvalue, loc); |
2c809f8f | 15478 | } |
15479 | ||
15480 | void | |
15481 | Interface_mtable_expression::do_dump_expression( | |
15482 | Ast_dump_context* ast_dump_context) const | |
15483 | { | |
15484 | ast_dump_context->ostream() << "__go_" | |
15485 | << (this->is_pointer_ ? "pimt__" : "imt_"); | |
15486 | ast_dump_context->dump_type(this->itype_); | |
15487 | ast_dump_context->ostream() << "__"; | |
15488 | ast_dump_context->dump_type(this->type_); | |
15489 | } | |
15490 | ||
15491 | Expression* | |
15492 | Expression::make_interface_mtable_ref(Interface_type* itype, Type* type, | |
15493 | bool is_pointer, Location location) | |
15494 | { | |
15495 | return new Interface_mtable_expression(itype, type, is_pointer, location); | |
15496 | } | |
15497 | ||
e440a328 | 15498 | // An expression which evaluates to the offset of a field within a |
15499 | // struct. This, like Type_info_expression, q.v., is only used to | |
15500 | // initialize fields of a type descriptor. | |
15501 | ||
15502 | class Struct_field_offset_expression : public Expression | |
15503 | { | |
15504 | public: | |
15505 | Struct_field_offset_expression(Struct_type* type, const Struct_field* field) | |
b13c66cd | 15506 | : Expression(EXPRESSION_STRUCT_FIELD_OFFSET, |
15507 | Linemap::predeclared_location()), | |
e440a328 | 15508 | type_(type), field_(field) |
15509 | { } | |
15510 | ||
15511 | protected: | |
f23d7786 | 15512 | bool |
3ae06f68 | 15513 | do_is_static_initializer() const |
f23d7786 | 15514 | { return true; } |
15515 | ||
e440a328 | 15516 | Type* |
15517 | do_type() | |
15518 | { return Type::lookup_integer_type("uintptr"); } | |
15519 | ||
15520 | void | |
15521 | do_determine_type(const Type_context*) | |
15522 | { } | |
15523 | ||
15524 | Expression* | |
15525 | do_copy() | |
15526 | { return this; } | |
15527 | ||
ea664253 | 15528 | Bexpression* |
15529 | do_get_backend(Translate_context* context); | |
e440a328 | 15530 | |
d751bb78 | 15531 | void |
15532 | do_dump_expression(Ast_dump_context*) const; | |
15533 | ||
e440a328 | 15534 | private: |
15535 | // The type of the struct. | |
15536 | Struct_type* type_; | |
15537 | // The field. | |
15538 | const Struct_field* field_; | |
15539 | }; | |
15540 | ||
ea664253 | 15541 | // Return the backend representation for a struct field offset. |
e440a328 | 15542 | |
ea664253 | 15543 | Bexpression* |
15544 | Struct_field_offset_expression::do_get_backend(Translate_context* context) | |
e440a328 | 15545 | { |
e440a328 | 15546 | const Struct_field_list* fields = this->type_->fields(); |
e440a328 | 15547 | Struct_field_list::const_iterator p; |
2c8bda43 | 15548 | unsigned i = 0; |
e440a328 | 15549 | for (p = fields->begin(); |
15550 | p != fields->end(); | |
2c8bda43 | 15551 | ++p, ++i) |
15552 | if (&*p == this->field_) | |
15553 | break; | |
c484d925 | 15554 | go_assert(&*p == this->field_); |
e440a328 | 15555 | |
2c8bda43 | 15556 | Gogo* gogo = context->gogo(); |
15557 | Btype* btype = this->type_->get_backend(gogo); | |
15558 | ||
3f378015 | 15559 | int64_t offset = gogo->backend()->type_field_offset(btype, i); |
2c8bda43 | 15560 | Type* uptr_type = Type::lookup_integer_type("uintptr"); |
e67508fa | 15561 | Expression* ret = |
3f378015 | 15562 | Expression::make_integer_int64(offset, uptr_type, |
15563 | Linemap::predeclared_location()); | |
ea664253 | 15564 | return ret->get_backend(context); |
e440a328 | 15565 | } |
15566 | ||
d751bb78 | 15567 | // Dump ast representation for a struct field offset expression. |
15568 | ||
15569 | void | |
15570 | Struct_field_offset_expression::do_dump_expression( | |
15571 | Ast_dump_context* ast_dump_context) const | |
15572 | { | |
15573 | ast_dump_context->ostream() << "unsafe.Offsetof("; | |
2d29d278 | 15574 | ast_dump_context->dump_type(this->type_); |
15575 | ast_dump_context->ostream() << '.'; | |
15576 | ast_dump_context->ostream() << | |
15577 | Gogo::message_name(this->field_->field_name()); | |
d751bb78 | 15578 | ast_dump_context->ostream() << ")"; |
15579 | } | |
15580 | ||
e440a328 | 15581 | // Make an expression for a struct field offset. |
15582 | ||
15583 | Expression* | |
15584 | Expression::make_struct_field_offset(Struct_type* type, | |
15585 | const Struct_field* field) | |
15586 | { | |
15587 | return new Struct_field_offset_expression(type, field); | |
15588 | } | |
15589 | ||
15590 | // An expression which evaluates to the address of an unnamed label. | |
15591 | ||
15592 | class Label_addr_expression : public Expression | |
15593 | { | |
15594 | public: | |
b13c66cd | 15595 | Label_addr_expression(Label* label, Location location) |
e440a328 | 15596 | : Expression(EXPRESSION_LABEL_ADDR, location), |
15597 | label_(label) | |
15598 | { } | |
15599 | ||
15600 | protected: | |
15601 | Type* | |
15602 | do_type() | |
15603 | { return Type::make_pointer_type(Type::make_void_type()); } | |
15604 | ||
15605 | void | |
15606 | do_determine_type(const Type_context*) | |
15607 | { } | |
15608 | ||
15609 | Expression* | |
15610 | do_copy() | |
15611 | { return new Label_addr_expression(this->label_, this->location()); } | |
15612 | ||
ea664253 | 15613 | Bexpression* |
15614 | do_get_backend(Translate_context* context) | |
15615 | { return this->label_->get_addr(context, this->location()); } | |
e440a328 | 15616 | |
d751bb78 | 15617 | void |
15618 | do_dump_expression(Ast_dump_context* ast_dump_context) const | |
15619 | { ast_dump_context->ostream() << this->label_->name(); } | |
15620 | ||
e440a328 | 15621 | private: |
15622 | // The label whose address we are taking. | |
15623 | Label* label_; | |
15624 | }; | |
15625 | ||
15626 | // Make an expression for the address of an unnamed label. | |
15627 | ||
15628 | Expression* | |
b13c66cd | 15629 | Expression::make_label_addr(Label* label, Location location) |
e440a328 | 15630 | { |
15631 | return new Label_addr_expression(label, location); | |
15632 | } | |
15633 | ||
da244e59 | 15634 | // Class Conditional_expression. |
283a177b | 15635 | |
2c809f8f | 15636 | // Traversal. |
15637 | ||
15638 | int | |
15639 | Conditional_expression::do_traverse(Traverse* traverse) | |
15640 | { | |
15641 | if (Expression::traverse(&this->cond_, traverse) == TRAVERSE_EXIT | |
15642 | || Expression::traverse(&this->then_, traverse) == TRAVERSE_EXIT | |
15643 | || Expression::traverse(&this->else_, traverse) == TRAVERSE_EXIT) | |
15644 | return TRAVERSE_EXIT; | |
15645 | return TRAVERSE_CONTINUE; | |
15646 | } | |
15647 | ||
283a177b | 15648 | // Return the type of the conditional expression. |
15649 | ||
15650 | Type* | |
15651 | Conditional_expression::do_type() | |
15652 | { | |
15653 | Type* result_type = Type::make_void_type(); | |
2c809f8f | 15654 | if (Type::are_identical(this->then_->type(), this->else_->type(), false, |
15655 | NULL)) | |
283a177b | 15656 | result_type = this->then_->type(); |
15657 | else if (this->then_->is_nil_expression() | |
15658 | || this->else_->is_nil_expression()) | |
15659 | result_type = (!this->then_->is_nil_expression() | |
15660 | ? this->then_->type() | |
15661 | : this->else_->type()); | |
15662 | return result_type; | |
15663 | } | |
15664 | ||
2c809f8f | 15665 | // Determine type for a conditional expression. |
15666 | ||
15667 | void | |
15668 | Conditional_expression::do_determine_type(const Type_context* context) | |
15669 | { | |
15670 | this->cond_->determine_type_no_context(); | |
15671 | this->then_->determine_type(context); | |
15672 | this->else_->determine_type(context); | |
15673 | } | |
15674 | ||
283a177b | 15675 | // Get the backend representation of a conditional expression. |
15676 | ||
ea664253 | 15677 | Bexpression* |
15678 | Conditional_expression::do_get_backend(Translate_context* context) | |
283a177b | 15679 | { |
15680 | Gogo* gogo = context->gogo(); | |
15681 | Btype* result_btype = this->type()->get_backend(gogo); | |
ea664253 | 15682 | Bexpression* cond = this->cond_->get_backend(context); |
15683 | Bexpression* then = this->then_->get_backend(context); | |
15684 | Bexpression* belse = this->else_->get_backend(context); | |
93715b75 | 15685 | Bfunction* bfn = context->function()->func_value()->get_decl(); |
15686 | return gogo->backend()->conditional_expression(bfn, result_btype, cond, then, | |
ea664253 | 15687 | belse, this->location()); |
283a177b | 15688 | } |
15689 | ||
15690 | // Dump ast representation of a conditional expression. | |
15691 | ||
15692 | void | |
15693 | Conditional_expression::do_dump_expression( | |
15694 | Ast_dump_context* ast_dump_context) const | |
15695 | { | |
15696 | ast_dump_context->ostream() << "("; | |
15697 | ast_dump_context->dump_expression(this->cond_); | |
15698 | ast_dump_context->ostream() << " ? "; | |
15699 | ast_dump_context->dump_expression(this->then_); | |
15700 | ast_dump_context->ostream() << " : "; | |
15701 | ast_dump_context->dump_expression(this->else_); | |
15702 | ast_dump_context->ostream() << ") "; | |
15703 | } | |
15704 | ||
15705 | // Make a conditional expression. | |
15706 | ||
15707 | Expression* | |
15708 | Expression::make_conditional(Expression* cond, Expression* then, | |
15709 | Expression* else_expr, Location location) | |
15710 | { | |
15711 | return new Conditional_expression(cond, then, else_expr, location); | |
15712 | } | |
15713 | ||
da244e59 | 15714 | // Class Compound_expression. |
2c809f8f | 15715 | |
15716 | // Traversal. | |
15717 | ||
15718 | int | |
15719 | Compound_expression::do_traverse(Traverse* traverse) | |
15720 | { | |
15721 | if (Expression::traverse(&this->init_, traverse) == TRAVERSE_EXIT | |
15722 | || Expression::traverse(&this->expr_, traverse) == TRAVERSE_EXIT) | |
15723 | return TRAVERSE_EXIT; | |
15724 | return TRAVERSE_CONTINUE; | |
15725 | } | |
15726 | ||
15727 | // Return the type of the compound expression. | |
15728 | ||
15729 | Type* | |
15730 | Compound_expression::do_type() | |
15731 | { | |
15732 | return this->expr_->type(); | |
15733 | } | |
15734 | ||
15735 | // Determine type for a compound expression. | |
15736 | ||
15737 | void | |
15738 | Compound_expression::do_determine_type(const Type_context* context) | |
15739 | { | |
15740 | this->init_->determine_type_no_context(); | |
15741 | this->expr_->determine_type(context); | |
15742 | } | |
15743 | ||
15744 | // Get the backend representation of a compound expression. | |
15745 | ||
ea664253 | 15746 | Bexpression* |
15747 | Compound_expression::do_get_backend(Translate_context* context) | |
2c809f8f | 15748 | { |
15749 | Gogo* gogo = context->gogo(); | |
ea664253 | 15750 | Bexpression* binit = this->init_->get_backend(context); |
0ab48656 | 15751 | Bfunction* bfunction = context->function()->func_value()->get_decl(); |
15752 | Bstatement* init_stmt = gogo->backend()->expression_statement(bfunction, | |
15753 | binit); | |
ea664253 | 15754 | Bexpression* bexpr = this->expr_->get_backend(context); |
15755 | return gogo->backend()->compound_expression(init_stmt, bexpr, | |
15756 | this->location()); | |
2c809f8f | 15757 | } |
15758 | ||
15759 | // Dump ast representation of a conditional expression. | |
15760 | ||
15761 | void | |
15762 | Compound_expression::do_dump_expression( | |
15763 | Ast_dump_context* ast_dump_context) const | |
15764 | { | |
15765 | ast_dump_context->ostream() << "("; | |
15766 | ast_dump_context->dump_expression(this->init_); | |
15767 | ast_dump_context->ostream() << ","; | |
15768 | ast_dump_context->dump_expression(this->expr_); | |
15769 | ast_dump_context->ostream() << ") "; | |
15770 | } | |
15771 | ||
15772 | // Make a compound expression. | |
15773 | ||
15774 | Expression* | |
15775 | Expression::make_compound(Expression* init, Expression* expr, Location location) | |
15776 | { | |
15777 | return new Compound_expression(init, expr, location); | |
15778 | } | |
15779 | ||
1b4fb1e0 | 15780 | // Class Backend_expression. |
15781 | ||
15782 | int | |
15783 | Backend_expression::do_traverse(Traverse*) | |
15784 | { | |
15785 | return TRAVERSE_CONTINUE; | |
15786 | } | |
15787 | ||
15788 | void | |
15789 | Backend_expression::do_dump_expression(Ast_dump_context* ast_dump_context) const | |
15790 | { | |
15791 | ast_dump_context->ostream() << "backend_expression<"; | |
15792 | ast_dump_context->dump_type(this->type_); | |
15793 | ast_dump_context->ostream() << ">"; | |
15794 | } | |
15795 | ||
15796 | Expression* | |
15797 | Expression::make_backend(Bexpression* bexpr, Type* type, Location location) | |
15798 | { | |
15799 | return new Backend_expression(bexpr, type, location); | |
15800 | } | |
15801 | ||
e440a328 | 15802 | // Import an expression. This comes at the end in order to see the |
15803 | // various class definitions. | |
15804 | ||
15805 | Expression* | |
15806 | Expression::import_expression(Import* imp) | |
15807 | { | |
15808 | int c = imp->peek_char(); | |
15809 | if (imp->match_c_string("- ") | |
15810 | || imp->match_c_string("! ") | |
15811 | || imp->match_c_string("^ ")) | |
15812 | return Unary_expression::do_import(imp); | |
15813 | else if (c == '(') | |
15814 | return Binary_expression::do_import(imp); | |
15815 | else if (imp->match_c_string("true") | |
15816 | || imp->match_c_string("false")) | |
15817 | return Boolean_expression::do_import(imp); | |
15818 | else if (c == '"') | |
15819 | return String_expression::do_import(imp); | |
15820 | else if (c == '-' || (c >= '0' && c <= '9')) | |
15821 | { | |
15822 | // This handles integers, floats and complex constants. | |
15823 | return Integer_expression::do_import(imp); | |
15824 | } | |
15825 | else if (imp->match_c_string("nil")) | |
15826 | return Nil_expression::do_import(imp); | |
15827 | else if (imp->match_c_string("convert")) | |
15828 | return Type_conversion_expression::do_import(imp); | |
15829 | else | |
15830 | { | |
631d5788 | 15831 | go_error_at(imp->location(), "import error: expected expression"); |
e440a328 | 15832 | return Expression::make_error(imp->location()); |
15833 | } | |
15834 | } | |
15835 | ||
15836 | // Class Expression_list. | |
15837 | ||
15838 | // Traverse the list. | |
15839 | ||
15840 | int | |
15841 | Expression_list::traverse(Traverse* traverse) | |
15842 | { | |
15843 | for (Expression_list::iterator p = this->begin(); | |
15844 | p != this->end(); | |
15845 | ++p) | |
15846 | { | |
15847 | if (*p != NULL) | |
15848 | { | |
15849 | if (Expression::traverse(&*p, traverse) == TRAVERSE_EXIT) | |
15850 | return TRAVERSE_EXIT; | |
15851 | } | |
15852 | } | |
15853 | return TRAVERSE_CONTINUE; | |
15854 | } | |
15855 | ||
15856 | // Copy the list. | |
15857 | ||
15858 | Expression_list* | |
15859 | Expression_list::copy() | |
15860 | { | |
15861 | Expression_list* ret = new Expression_list(); | |
15862 | for (Expression_list::iterator p = this->begin(); | |
15863 | p != this->end(); | |
15864 | ++p) | |
15865 | { | |
15866 | if (*p == NULL) | |
15867 | ret->push_back(NULL); | |
15868 | else | |
15869 | ret->push_back((*p)->copy()); | |
15870 | } | |
15871 | return ret; | |
15872 | } | |
15873 | ||
15874 | // Return whether an expression list has an error expression. | |
15875 | ||
15876 | bool | |
15877 | Expression_list::contains_error() const | |
15878 | { | |
15879 | for (Expression_list::const_iterator p = this->begin(); | |
15880 | p != this->end(); | |
15881 | ++p) | |
15882 | if (*p != NULL && (*p)->is_error_expression()) | |
15883 | return true; | |
15884 | return false; | |
15885 | } | |
0c77715b | 15886 | |
15887 | // Class Numeric_constant. | |
15888 | ||
15889 | // Destructor. | |
15890 | ||
15891 | Numeric_constant::~Numeric_constant() | |
15892 | { | |
15893 | this->clear(); | |
15894 | } | |
15895 | ||
15896 | // Copy constructor. | |
15897 | ||
15898 | Numeric_constant::Numeric_constant(const Numeric_constant& a) | |
15899 | : classification_(a.classification_), type_(a.type_) | |
15900 | { | |
15901 | switch (a.classification_) | |
15902 | { | |
15903 | case NC_INVALID: | |
15904 | break; | |
15905 | case NC_INT: | |
15906 | case NC_RUNE: | |
15907 | mpz_init_set(this->u_.int_val, a.u_.int_val); | |
15908 | break; | |
15909 | case NC_FLOAT: | |
15910 | mpfr_init_set(this->u_.float_val, a.u_.float_val, GMP_RNDN); | |
15911 | break; | |
15912 | case NC_COMPLEX: | |
fcbea5e4 | 15913 | mpc_init2(this->u_.complex_val, mpc_precision); |
15914 | mpc_set(this->u_.complex_val, a.u_.complex_val, MPC_RNDNN); | |
0c77715b | 15915 | break; |
15916 | default: | |
15917 | go_unreachable(); | |
15918 | } | |
15919 | } | |
15920 | ||
15921 | // Assignment operator. | |
15922 | ||
15923 | Numeric_constant& | |
15924 | Numeric_constant::operator=(const Numeric_constant& a) | |
15925 | { | |
15926 | this->clear(); | |
15927 | this->classification_ = a.classification_; | |
15928 | this->type_ = a.type_; | |
15929 | switch (a.classification_) | |
15930 | { | |
15931 | case NC_INVALID: | |
15932 | break; | |
15933 | case NC_INT: | |
15934 | case NC_RUNE: | |
15935 | mpz_init_set(this->u_.int_val, a.u_.int_val); | |
15936 | break; | |
15937 | case NC_FLOAT: | |
15938 | mpfr_init_set(this->u_.float_val, a.u_.float_val, GMP_RNDN); | |
15939 | break; | |
15940 | case NC_COMPLEX: | |
fcbea5e4 | 15941 | mpc_init2(this->u_.complex_val, mpc_precision); |
15942 | mpc_set(this->u_.complex_val, a.u_.complex_val, MPC_RNDNN); | |
0c77715b | 15943 | break; |
15944 | default: | |
15945 | go_unreachable(); | |
15946 | } | |
15947 | return *this; | |
15948 | } | |
15949 | ||
15950 | // Clear the contents. | |
15951 | ||
15952 | void | |
15953 | Numeric_constant::clear() | |
15954 | { | |
15955 | switch (this->classification_) | |
15956 | { | |
15957 | case NC_INVALID: | |
15958 | break; | |
15959 | case NC_INT: | |
15960 | case NC_RUNE: | |
15961 | mpz_clear(this->u_.int_val); | |
15962 | break; | |
15963 | case NC_FLOAT: | |
15964 | mpfr_clear(this->u_.float_val); | |
15965 | break; | |
15966 | case NC_COMPLEX: | |
fcbea5e4 | 15967 | mpc_clear(this->u_.complex_val); |
0c77715b | 15968 | break; |
15969 | default: | |
15970 | go_unreachable(); | |
15971 | } | |
15972 | this->classification_ = NC_INVALID; | |
15973 | } | |
15974 | ||
15975 | // Set to an unsigned long value. | |
15976 | ||
15977 | void | |
15978 | Numeric_constant::set_unsigned_long(Type* type, unsigned long val) | |
15979 | { | |
15980 | this->clear(); | |
15981 | this->classification_ = NC_INT; | |
15982 | this->type_ = type; | |
15983 | mpz_init_set_ui(this->u_.int_val, val); | |
15984 | } | |
15985 | ||
15986 | // Set to an integer value. | |
15987 | ||
15988 | void | |
15989 | Numeric_constant::set_int(Type* type, const mpz_t val) | |
15990 | { | |
15991 | this->clear(); | |
15992 | this->classification_ = NC_INT; | |
15993 | this->type_ = type; | |
15994 | mpz_init_set(this->u_.int_val, val); | |
15995 | } | |
15996 | ||
15997 | // Set to a rune value. | |
15998 | ||
15999 | void | |
16000 | Numeric_constant::set_rune(Type* type, const mpz_t val) | |
16001 | { | |
16002 | this->clear(); | |
16003 | this->classification_ = NC_RUNE; | |
16004 | this->type_ = type; | |
16005 | mpz_init_set(this->u_.int_val, val); | |
16006 | } | |
16007 | ||
16008 | // Set to a floating point value. | |
16009 | ||
16010 | void | |
16011 | Numeric_constant::set_float(Type* type, const mpfr_t val) | |
16012 | { | |
16013 | this->clear(); | |
16014 | this->classification_ = NC_FLOAT; | |
16015 | this->type_ = type; | |
833b523c | 16016 | // Numeric constants do not have negative zero values, so remove |
16017 | // them here. They also don't have infinity or NaN values, but we | |
16018 | // should never see them here. | |
16019 | if (mpfr_zero_p(val)) | |
16020 | mpfr_init_set_ui(this->u_.float_val, 0, GMP_RNDN); | |
16021 | else | |
16022 | mpfr_init_set(this->u_.float_val, val, GMP_RNDN); | |
0c77715b | 16023 | } |
16024 | ||
16025 | // Set to a complex value. | |
16026 | ||
16027 | void | |
fcbea5e4 | 16028 | Numeric_constant::set_complex(Type* type, const mpc_t val) |
0c77715b | 16029 | { |
16030 | this->clear(); | |
16031 | this->classification_ = NC_COMPLEX; | |
16032 | this->type_ = type; | |
fcbea5e4 | 16033 | mpc_init2(this->u_.complex_val, mpc_precision); |
16034 | mpc_set(this->u_.complex_val, val, MPC_RNDNN); | |
0c77715b | 16035 | } |
16036 | ||
16037 | // Get an int value. | |
16038 | ||
16039 | void | |
16040 | Numeric_constant::get_int(mpz_t* val) const | |
16041 | { | |
16042 | go_assert(this->is_int()); | |
16043 | mpz_init_set(*val, this->u_.int_val); | |
16044 | } | |
16045 | ||
16046 | // Get a rune value. | |
16047 | ||
16048 | void | |
16049 | Numeric_constant::get_rune(mpz_t* val) const | |
16050 | { | |
16051 | go_assert(this->is_rune()); | |
16052 | mpz_init_set(*val, this->u_.int_val); | |
16053 | } | |
16054 | ||
16055 | // Get a floating point value. | |
16056 | ||
16057 | void | |
16058 | Numeric_constant::get_float(mpfr_t* val) const | |
16059 | { | |
16060 | go_assert(this->is_float()); | |
16061 | mpfr_init_set(*val, this->u_.float_val, GMP_RNDN); | |
16062 | } | |
16063 | ||
16064 | // Get a complex value. | |
16065 | ||
16066 | void | |
fcbea5e4 | 16067 | Numeric_constant::get_complex(mpc_t* val) const |
0c77715b | 16068 | { |
16069 | go_assert(this->is_complex()); | |
fcbea5e4 | 16070 | mpc_init2(*val, mpc_precision); |
16071 | mpc_set(*val, this->u_.complex_val, MPC_RNDNN); | |
0c77715b | 16072 | } |
16073 | ||
16074 | // Express value as unsigned long if possible. | |
16075 | ||
16076 | Numeric_constant::To_unsigned_long | |
16077 | Numeric_constant::to_unsigned_long(unsigned long* val) const | |
16078 | { | |
16079 | switch (this->classification_) | |
16080 | { | |
16081 | case NC_INT: | |
16082 | case NC_RUNE: | |
16083 | return this->mpz_to_unsigned_long(this->u_.int_val, val); | |
16084 | case NC_FLOAT: | |
16085 | return this->mpfr_to_unsigned_long(this->u_.float_val, val); | |
16086 | case NC_COMPLEX: | |
fcbea5e4 | 16087 | if (!mpfr_zero_p(mpc_imagref(this->u_.complex_val))) |
0c77715b | 16088 | return NC_UL_NOTINT; |
fcbea5e4 | 16089 | return this->mpfr_to_unsigned_long(mpc_realref(this->u_.complex_val), |
16090 | val); | |
0c77715b | 16091 | default: |
16092 | go_unreachable(); | |
16093 | } | |
16094 | } | |
16095 | ||
16096 | // Express integer value as unsigned long if possible. | |
16097 | ||
16098 | Numeric_constant::To_unsigned_long | |
16099 | Numeric_constant::mpz_to_unsigned_long(const mpz_t ival, | |
16100 | unsigned long *val) const | |
16101 | { | |
16102 | if (mpz_sgn(ival) < 0) | |
16103 | return NC_UL_NEGATIVE; | |
16104 | unsigned long ui = mpz_get_ui(ival); | |
16105 | if (mpz_cmp_ui(ival, ui) != 0) | |
16106 | return NC_UL_BIG; | |
16107 | *val = ui; | |
16108 | return NC_UL_VALID; | |
16109 | } | |
16110 | ||
16111 | // Express floating point value as unsigned long if possible. | |
16112 | ||
16113 | Numeric_constant::To_unsigned_long | |
16114 | Numeric_constant::mpfr_to_unsigned_long(const mpfr_t fval, | |
16115 | unsigned long *val) const | |
16116 | { | |
16117 | if (!mpfr_integer_p(fval)) | |
16118 | return NC_UL_NOTINT; | |
16119 | mpz_t ival; | |
16120 | mpz_init(ival); | |
16121 | mpfr_get_z(ival, fval, GMP_RNDN); | |
16122 | To_unsigned_long ret = this->mpz_to_unsigned_long(ival, val); | |
16123 | mpz_clear(ival); | |
16124 | return ret; | |
16125 | } | |
16126 | ||
03118c21 | 16127 | // Express value as memory size if possible. |
16128 | ||
16129 | bool | |
16130 | Numeric_constant::to_memory_size(int64_t* val) const | |
16131 | { | |
16132 | switch (this->classification_) | |
16133 | { | |
16134 | case NC_INT: | |
16135 | case NC_RUNE: | |
16136 | return this->mpz_to_memory_size(this->u_.int_val, val); | |
16137 | case NC_FLOAT: | |
16138 | return this->mpfr_to_memory_size(this->u_.float_val, val); | |
16139 | case NC_COMPLEX: | |
16140 | if (!mpfr_zero_p(mpc_imagref(this->u_.complex_val))) | |
16141 | return false; | |
16142 | return this->mpfr_to_memory_size(mpc_realref(this->u_.complex_val), val); | |
16143 | default: | |
16144 | go_unreachable(); | |
16145 | } | |
16146 | } | |
16147 | ||
16148 | // Express integer as memory size if possible. | |
16149 | ||
16150 | bool | |
16151 | Numeric_constant::mpz_to_memory_size(const mpz_t ival, int64_t* val) const | |
16152 | { | |
16153 | if (mpz_sgn(ival) < 0) | |
16154 | return false; | |
16155 | if (mpz_fits_slong_p(ival)) | |
16156 | { | |
16157 | *val = static_cast<int64_t>(mpz_get_si(ival)); | |
16158 | return true; | |
16159 | } | |
16160 | ||
16161 | // Test >= 64, not > 64, because an int64_t can hold 63 bits of a | |
16162 | // positive value. | |
16163 | if (mpz_sizeinbase(ival, 2) >= 64) | |
16164 | return false; | |
16165 | ||
16166 | mpz_t q, r; | |
16167 | mpz_init(q); | |
16168 | mpz_init(r); | |
16169 | mpz_tdiv_q_2exp(q, ival, 32); | |
16170 | mpz_tdiv_r_2exp(r, ival, 32); | |
16171 | go_assert(mpz_fits_ulong_p(q) && mpz_fits_ulong_p(r)); | |
16172 | *val = ((static_cast<int64_t>(mpz_get_ui(q)) << 32) | |
16173 | + static_cast<int64_t>(mpz_get_ui(r))); | |
16174 | mpz_clear(r); | |
16175 | mpz_clear(q); | |
16176 | return true; | |
16177 | } | |
16178 | ||
16179 | // Express floating point value as memory size if possible. | |
16180 | ||
16181 | bool | |
16182 | Numeric_constant::mpfr_to_memory_size(const mpfr_t fval, int64_t* val) const | |
16183 | { | |
16184 | if (!mpfr_integer_p(fval)) | |
16185 | return false; | |
16186 | mpz_t ival; | |
16187 | mpz_init(ival); | |
16188 | mpfr_get_z(ival, fval, GMP_RNDN); | |
16189 | bool ret = this->mpz_to_memory_size(ival, val); | |
16190 | mpz_clear(ival); | |
16191 | return ret; | |
16192 | } | |
16193 | ||
0c77715b | 16194 | // Convert value to integer if possible. |
16195 | ||
16196 | bool | |
16197 | Numeric_constant::to_int(mpz_t* val) const | |
16198 | { | |
16199 | switch (this->classification_) | |
16200 | { | |
16201 | case NC_INT: | |
16202 | case NC_RUNE: | |
16203 | mpz_init_set(*val, this->u_.int_val); | |
16204 | return true; | |
16205 | case NC_FLOAT: | |
16206 | if (!mpfr_integer_p(this->u_.float_val)) | |
16207 | return false; | |
16208 | mpz_init(*val); | |
16209 | mpfr_get_z(*val, this->u_.float_val, GMP_RNDN); | |
16210 | return true; | |
16211 | case NC_COMPLEX: | |
fcbea5e4 | 16212 | if (!mpfr_zero_p(mpc_imagref(this->u_.complex_val)) |
16213 | || !mpfr_integer_p(mpc_realref(this->u_.complex_val))) | |
0c77715b | 16214 | return false; |
16215 | mpz_init(*val); | |
fcbea5e4 | 16216 | mpfr_get_z(*val, mpc_realref(this->u_.complex_val), GMP_RNDN); |
0c77715b | 16217 | return true; |
16218 | default: | |
16219 | go_unreachable(); | |
16220 | } | |
16221 | } | |
16222 | ||
16223 | // Convert value to floating point if possible. | |
16224 | ||
16225 | bool | |
16226 | Numeric_constant::to_float(mpfr_t* val) const | |
16227 | { | |
16228 | switch (this->classification_) | |
16229 | { | |
16230 | case NC_INT: | |
16231 | case NC_RUNE: | |
16232 | mpfr_init_set_z(*val, this->u_.int_val, GMP_RNDN); | |
16233 | return true; | |
16234 | case NC_FLOAT: | |
16235 | mpfr_init_set(*val, this->u_.float_val, GMP_RNDN); | |
16236 | return true; | |
16237 | case NC_COMPLEX: | |
fcbea5e4 | 16238 | if (!mpfr_zero_p(mpc_imagref(this->u_.complex_val))) |
0c77715b | 16239 | return false; |
fcbea5e4 | 16240 | mpfr_init_set(*val, mpc_realref(this->u_.complex_val), GMP_RNDN); |
0c77715b | 16241 | return true; |
16242 | default: | |
16243 | go_unreachable(); | |
16244 | } | |
16245 | } | |
16246 | ||
16247 | // Convert value to complex. | |
16248 | ||
16249 | bool | |
fcbea5e4 | 16250 | Numeric_constant::to_complex(mpc_t* val) const |
0c77715b | 16251 | { |
fcbea5e4 | 16252 | mpc_init2(*val, mpc_precision); |
0c77715b | 16253 | switch (this->classification_) |
16254 | { | |
16255 | case NC_INT: | |
16256 | case NC_RUNE: | |
fcbea5e4 | 16257 | mpc_set_z(*val, this->u_.int_val, MPC_RNDNN); |
0c77715b | 16258 | return true; |
16259 | case NC_FLOAT: | |
fcbea5e4 | 16260 | mpc_set_fr(*val, this->u_.float_val, MPC_RNDNN); |
0c77715b | 16261 | return true; |
16262 | case NC_COMPLEX: | |
fcbea5e4 | 16263 | mpc_set(*val, this->u_.complex_val, MPC_RNDNN); |
0c77715b | 16264 | return true; |
16265 | default: | |
16266 | go_unreachable(); | |
16267 | } | |
16268 | } | |
16269 | ||
16270 | // Get the type. | |
16271 | ||
16272 | Type* | |
16273 | Numeric_constant::type() const | |
16274 | { | |
16275 | if (this->type_ != NULL) | |
16276 | return this->type_; | |
16277 | switch (this->classification_) | |
16278 | { | |
16279 | case NC_INT: | |
16280 | return Type::make_abstract_integer_type(); | |
16281 | case NC_RUNE: | |
16282 | return Type::make_abstract_character_type(); | |
16283 | case NC_FLOAT: | |
16284 | return Type::make_abstract_float_type(); | |
16285 | case NC_COMPLEX: | |
16286 | return Type::make_abstract_complex_type(); | |
16287 | default: | |
16288 | go_unreachable(); | |
16289 | } | |
16290 | } | |
16291 | ||
16292 | // If the constant can be expressed in TYPE, then set the type of the | |
16293 | // constant to TYPE and return true. Otherwise return false, and, if | |
16294 | // ISSUE_ERROR is true, report an appropriate error message. | |
16295 | ||
16296 | bool | |
16297 | Numeric_constant::set_type(Type* type, bool issue_error, Location loc) | |
16298 | { | |
16299 | bool ret; | |
f11c2155 | 16300 | if (type == NULL || type->is_error()) |
0c77715b | 16301 | ret = true; |
16302 | else if (type->integer_type() != NULL) | |
16303 | ret = this->check_int_type(type->integer_type(), issue_error, loc); | |
16304 | else if (type->float_type() != NULL) | |
16305 | ret = this->check_float_type(type->float_type(), issue_error, loc); | |
16306 | else if (type->complex_type() != NULL) | |
16307 | ret = this->check_complex_type(type->complex_type(), issue_error, loc); | |
16308 | else | |
5706ab68 | 16309 | { |
16310 | ret = false; | |
16311 | if (issue_error) | |
16312 | go_assert(saw_errors()); | |
16313 | } | |
0c77715b | 16314 | if (ret) |
16315 | this->type_ = type; | |
16316 | return ret; | |
16317 | } | |
16318 | ||
16319 | // Check whether the constant can be expressed in an integer type. | |
16320 | ||
16321 | bool | |
16322 | Numeric_constant::check_int_type(Integer_type* type, bool issue_error, | |
71a45216 | 16323 | Location location) |
0c77715b | 16324 | { |
16325 | mpz_t val; | |
16326 | switch (this->classification_) | |
16327 | { | |
16328 | case NC_INT: | |
16329 | case NC_RUNE: | |
16330 | mpz_init_set(val, this->u_.int_val); | |
16331 | break; | |
16332 | ||
16333 | case NC_FLOAT: | |
16334 | if (!mpfr_integer_p(this->u_.float_val)) | |
16335 | { | |
16336 | if (issue_error) | |
71a45216 | 16337 | { |
631d5788 | 16338 | go_error_at(location, |
16339 | "floating point constant truncated to integer"); | |
71a45216 | 16340 | this->set_invalid(); |
16341 | } | |
0c77715b | 16342 | return false; |
16343 | } | |
16344 | mpz_init(val); | |
16345 | mpfr_get_z(val, this->u_.float_val, GMP_RNDN); | |
16346 | break; | |
16347 | ||
16348 | case NC_COMPLEX: | |
fcbea5e4 | 16349 | if (!mpfr_integer_p(mpc_realref(this->u_.complex_val)) |
16350 | || !mpfr_zero_p(mpc_imagref(this->u_.complex_val))) | |
0c77715b | 16351 | { |
16352 | if (issue_error) | |
71a45216 | 16353 | { |
631d5788 | 16354 | go_error_at(location, "complex constant truncated to integer"); |
71a45216 | 16355 | this->set_invalid(); |
16356 | } | |
0c77715b | 16357 | return false; |
16358 | } | |
16359 | mpz_init(val); | |
fcbea5e4 | 16360 | mpfr_get_z(val, mpc_realref(this->u_.complex_val), GMP_RNDN); |
0c77715b | 16361 | break; |
16362 | ||
16363 | default: | |
16364 | go_unreachable(); | |
16365 | } | |
16366 | ||
16367 | bool ret; | |
16368 | if (type->is_abstract()) | |
16369 | ret = true; | |
16370 | else | |
16371 | { | |
16372 | int bits = mpz_sizeinbase(val, 2); | |
16373 | if (type->is_unsigned()) | |
16374 | { | |
16375 | // For an unsigned type we can only accept a nonnegative | |
16376 | // number, and we must be able to represents at least BITS. | |
16377 | ret = mpz_sgn(val) >= 0 && bits <= type->bits(); | |
16378 | } | |
16379 | else | |
16380 | { | |
16381 | // For a signed type we need an extra bit to indicate the | |
16382 | // sign. We have to handle the most negative integer | |
16383 | // specially. | |
16384 | ret = (bits + 1 <= type->bits() | |
16385 | || (bits <= type->bits() | |
16386 | && mpz_sgn(val) < 0 | |
16387 | && (mpz_scan1(val, 0) | |
16388 | == static_cast<unsigned long>(type->bits() - 1)) | |
16389 | && mpz_scan0(val, type->bits()) == ULONG_MAX)); | |
16390 | } | |
16391 | } | |
16392 | ||
16393 | if (!ret && issue_error) | |
71a45216 | 16394 | { |
631d5788 | 16395 | go_error_at(location, "integer constant overflow"); |
71a45216 | 16396 | this->set_invalid(); |
16397 | } | |
0c77715b | 16398 | |
16399 | return ret; | |
16400 | } | |
16401 | ||
16402 | // Check whether the constant can be expressed in a floating point | |
16403 | // type. | |
16404 | ||
16405 | bool | |
16406 | Numeric_constant::check_float_type(Float_type* type, bool issue_error, | |
d0bcce51 | 16407 | Location location) |
0c77715b | 16408 | { |
16409 | mpfr_t val; | |
16410 | switch (this->classification_) | |
16411 | { | |
16412 | case NC_INT: | |
16413 | case NC_RUNE: | |
16414 | mpfr_init_set_z(val, this->u_.int_val, GMP_RNDN); | |
16415 | break; | |
16416 | ||
16417 | case NC_FLOAT: | |
16418 | mpfr_init_set(val, this->u_.float_val, GMP_RNDN); | |
16419 | break; | |
16420 | ||
16421 | case NC_COMPLEX: | |
fcbea5e4 | 16422 | if (!mpfr_zero_p(mpc_imagref(this->u_.complex_val))) |
0c77715b | 16423 | { |
16424 | if (issue_error) | |
71a45216 | 16425 | { |
16426 | this->set_invalid(); | |
631d5788 | 16427 | go_error_at(location, "complex constant truncated to float"); |
71a45216 | 16428 | } |
0c77715b | 16429 | return false; |
16430 | } | |
fcbea5e4 | 16431 | mpfr_init_set(val, mpc_realref(this->u_.complex_val), GMP_RNDN); |
0c77715b | 16432 | break; |
16433 | ||
16434 | default: | |
16435 | go_unreachable(); | |
16436 | } | |
16437 | ||
16438 | bool ret; | |
16439 | if (type->is_abstract()) | |
16440 | ret = true; | |
16441 | else if (mpfr_nan_p(val) || mpfr_inf_p(val) || mpfr_zero_p(val)) | |
16442 | { | |
16443 | // A NaN or Infinity always fits in the range of the type. | |
16444 | ret = true; | |
16445 | } | |
16446 | else | |
16447 | { | |
16448 | mp_exp_t exp = mpfr_get_exp(val); | |
16449 | mp_exp_t max_exp; | |
16450 | switch (type->bits()) | |
16451 | { | |
16452 | case 32: | |
16453 | max_exp = 128; | |
16454 | break; | |
16455 | case 64: | |
16456 | max_exp = 1024; | |
16457 | break; | |
16458 | default: | |
16459 | go_unreachable(); | |
16460 | } | |
16461 | ||
16462 | ret = exp <= max_exp; | |
d0bcce51 | 16463 | |
16464 | if (ret) | |
16465 | { | |
16466 | // Round the constant to the desired type. | |
16467 | mpfr_t t; | |
16468 | mpfr_init(t); | |
16469 | switch (type->bits()) | |
16470 | { | |
16471 | case 32: | |
16472 | mpfr_set_prec(t, 24); | |
16473 | break; | |
16474 | case 64: | |
16475 | mpfr_set_prec(t, 53); | |
16476 | break; | |
16477 | default: | |
16478 | go_unreachable(); | |
16479 | } | |
16480 | mpfr_set(t, val, GMP_RNDN); | |
16481 | mpfr_set(val, t, GMP_RNDN); | |
16482 | mpfr_clear(t); | |
16483 | ||
16484 | this->set_float(type, val); | |
16485 | } | |
0c77715b | 16486 | } |
16487 | ||
16488 | mpfr_clear(val); | |
16489 | ||
16490 | if (!ret && issue_error) | |
71a45216 | 16491 | { |
631d5788 | 16492 | go_error_at(location, "floating point constant overflow"); |
71a45216 | 16493 | this->set_invalid(); |
16494 | } | |
0c77715b | 16495 | |
16496 | return ret; | |
16497 | } | |
16498 | ||
16499 | // Check whether the constant can be expressed in a complex type. | |
16500 | ||
16501 | bool | |
16502 | Numeric_constant::check_complex_type(Complex_type* type, bool issue_error, | |
d0bcce51 | 16503 | Location location) |
0c77715b | 16504 | { |
16505 | if (type->is_abstract()) | |
16506 | return true; | |
16507 | ||
16508 | mp_exp_t max_exp; | |
16509 | switch (type->bits()) | |
16510 | { | |
16511 | case 64: | |
16512 | max_exp = 128; | |
16513 | break; | |
16514 | case 128: | |
16515 | max_exp = 1024; | |
16516 | break; | |
16517 | default: | |
16518 | go_unreachable(); | |
16519 | } | |
16520 | ||
fcbea5e4 | 16521 | mpc_t val; |
16522 | mpc_init2(val, mpc_precision); | |
0c77715b | 16523 | switch (this->classification_) |
16524 | { | |
16525 | case NC_INT: | |
16526 | case NC_RUNE: | |
fcbea5e4 | 16527 | mpc_set_z(val, this->u_.int_val, MPC_RNDNN); |
0c77715b | 16528 | break; |
16529 | ||
16530 | case NC_FLOAT: | |
fcbea5e4 | 16531 | mpc_set_fr(val, this->u_.float_val, MPC_RNDNN); |
0c77715b | 16532 | break; |
16533 | ||
16534 | case NC_COMPLEX: | |
fcbea5e4 | 16535 | mpc_set(val, this->u_.complex_val, MPC_RNDNN); |
0c77715b | 16536 | break; |
16537 | ||
16538 | default: | |
16539 | go_unreachable(); | |
16540 | } | |
16541 | ||
d0bcce51 | 16542 | bool ret = true; |
fcbea5e4 | 16543 | if (!mpfr_nan_p(mpc_realref(val)) |
16544 | && !mpfr_inf_p(mpc_realref(val)) | |
16545 | && !mpfr_zero_p(mpc_realref(val)) | |
16546 | && mpfr_get_exp(mpc_realref(val)) > max_exp) | |
d0bcce51 | 16547 | { |
16548 | if (issue_error) | |
71a45216 | 16549 | { |
631d5788 | 16550 | go_error_at(location, "complex real part overflow"); |
71a45216 | 16551 | this->set_invalid(); |
16552 | } | |
d0bcce51 | 16553 | ret = false; |
16554 | } | |
0c77715b | 16555 | |
fcbea5e4 | 16556 | if (!mpfr_nan_p(mpc_imagref(val)) |
16557 | && !mpfr_inf_p(mpc_imagref(val)) | |
16558 | && !mpfr_zero_p(mpc_imagref(val)) | |
16559 | && mpfr_get_exp(mpc_imagref(val)) > max_exp) | |
d0bcce51 | 16560 | { |
16561 | if (issue_error) | |
71a45216 | 16562 | { |
631d5788 | 16563 | go_error_at(location, "complex imaginary part overflow"); |
71a45216 | 16564 | this->set_invalid(); |
16565 | } | |
d0bcce51 | 16566 | ret = false; |
16567 | } | |
0c77715b | 16568 | |
d0bcce51 | 16569 | if (ret) |
16570 | { | |
16571 | // Round the constant to the desired type. | |
fcbea5e4 | 16572 | mpc_t t; |
d0bcce51 | 16573 | switch (type->bits()) |
16574 | { | |
16575 | case 64: | |
fcbea5e4 | 16576 | mpc_init2(t, 24); |
d0bcce51 | 16577 | break; |
16578 | case 128: | |
fcbea5e4 | 16579 | mpc_init2(t, 53); |
d0bcce51 | 16580 | break; |
16581 | default: | |
16582 | go_unreachable(); | |
16583 | } | |
fcbea5e4 | 16584 | mpc_set(t, val, MPC_RNDNN); |
16585 | mpc_set(val, t, MPC_RNDNN); | |
16586 | mpc_clear(t); | |
d0bcce51 | 16587 | |
fcbea5e4 | 16588 | this->set_complex(type, val); |
d0bcce51 | 16589 | } |
16590 | ||
fcbea5e4 | 16591 | mpc_clear(val); |
0c77715b | 16592 | |
16593 | return ret; | |
16594 | } | |
16595 | ||
16596 | // Return an Expression for this value. | |
16597 | ||
16598 | Expression* | |
16599 | Numeric_constant::expression(Location loc) const | |
16600 | { | |
16601 | switch (this->classification_) | |
16602 | { | |
16603 | case NC_INT: | |
e67508fa | 16604 | return Expression::make_integer_z(&this->u_.int_val, this->type_, loc); |
0c77715b | 16605 | case NC_RUNE: |
16606 | return Expression::make_character(&this->u_.int_val, this->type_, loc); | |
16607 | case NC_FLOAT: | |
16608 | return Expression::make_float(&this->u_.float_val, this->type_, loc); | |
16609 | case NC_COMPLEX: | |
fcbea5e4 | 16610 | return Expression::make_complex(&this->u_.complex_val, this->type_, loc); |
71a45216 | 16611 | case NC_INVALID: |
16612 | go_assert(saw_errors()); | |
16613 | return Expression::make_error(loc); | |
0c77715b | 16614 | default: |
16615 | go_unreachable(); | |
16616 | } | |
16617 | } |