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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(); | |
44dbe1d7 | 6473 | bool is_lvalue = false; |
6474 | left = at->get_value_pointer(context->gogo(), left, is_lvalue); | |
e440a328 | 6475 | } |
6476 | else if (left_type->interface_type() != NULL) | |
6477 | { | |
6478 | // An interface is nil if the first field is nil. | |
2387f644 | 6479 | left = Expression::make_field_reference(left, 0, location); |
e440a328 | 6480 | } |
6481 | } | |
6482 | ||
ea664253 | 6483 | Bexpression* left_bexpr = left->get_backend(context); |
6484 | Bexpression* right_bexpr = right->get_backend(context); | |
e90c9dfc | 6485 | |
a32698ee | 6486 | Gogo* gogo = context->gogo(); |
6487 | Bexpression* ret = gogo->backend()->binary_expression(op, left_bexpr, | |
6488 | right_bexpr, location); | |
6489 | if (result_type != NULL) | |
6490 | ret = gogo->backend()->convert_expression(result_type->get_backend(gogo), | |
6491 | ret, location); | |
e440a328 | 6492 | return ret; |
6493 | } | |
6494 | ||
736a16ba | 6495 | // Class String_concat_expression. |
6496 | ||
6497 | bool | |
6498 | String_concat_expression::do_is_constant() const | |
6499 | { | |
6500 | for (Expression_list::const_iterator pe = this->exprs_->begin(); | |
6501 | pe != this->exprs_->end(); | |
6502 | ++pe) | |
6503 | { | |
6504 | if (!(*pe)->is_constant()) | |
6505 | return false; | |
6506 | } | |
6507 | return true; | |
6508 | } | |
6509 | ||
6510 | bool | |
3ae06f68 | 6511 | String_concat_expression::do_is_static_initializer() const |
736a16ba | 6512 | { |
6513 | for (Expression_list::const_iterator pe = this->exprs_->begin(); | |
6514 | pe != this->exprs_->end(); | |
6515 | ++pe) | |
6516 | { | |
3ae06f68 | 6517 | if (!(*pe)->is_static_initializer()) |
736a16ba | 6518 | return false; |
6519 | } | |
6520 | return true; | |
6521 | } | |
6522 | ||
6523 | Type* | |
6524 | String_concat_expression::do_type() | |
6525 | { | |
6526 | Type* t = this->exprs_->front()->type(); | |
6527 | Expression_list::iterator pe = this->exprs_->begin(); | |
6528 | ++pe; | |
6529 | for (; pe != this->exprs_->end(); ++pe) | |
6530 | { | |
6531 | Type* t1; | |
6532 | if (!Binary_expression::operation_type(OPERATOR_PLUS, t, | |
6533 | (*pe)->type(), | |
6534 | &t1)) | |
6535 | return Type::make_error_type(); | |
6536 | t = t1; | |
6537 | } | |
6538 | return t; | |
6539 | } | |
6540 | ||
6541 | void | |
6542 | String_concat_expression::do_determine_type(const Type_context* context) | |
6543 | { | |
6544 | Type_context subcontext(*context); | |
6545 | for (Expression_list::iterator pe = this->exprs_->begin(); | |
6546 | pe != this->exprs_->end(); | |
6547 | ++pe) | |
6548 | { | |
6549 | Type* t = (*pe)->type(); | |
6550 | if (!t->is_abstract()) | |
6551 | { | |
6552 | subcontext.type = t; | |
6553 | break; | |
6554 | } | |
6555 | } | |
6556 | if (subcontext.type == NULL) | |
6557 | subcontext.type = this->exprs_->front()->type(); | |
6558 | for (Expression_list::iterator pe = this->exprs_->begin(); | |
6559 | pe != this->exprs_->end(); | |
6560 | ++pe) | |
6561 | (*pe)->determine_type(&subcontext); | |
6562 | } | |
6563 | ||
6564 | void | |
6565 | String_concat_expression::do_check_types(Gogo*) | |
6566 | { | |
6567 | if (this->is_error_expression()) | |
6568 | return; | |
6569 | Type* t = this->exprs_->front()->type(); | |
6570 | if (t->is_error()) | |
6571 | { | |
6572 | this->set_is_error(); | |
6573 | return; | |
6574 | } | |
6575 | Expression_list::iterator pe = this->exprs_->begin(); | |
6576 | ++pe; | |
6577 | for (; pe != this->exprs_->end(); ++pe) | |
6578 | { | |
6579 | Type* t1 = (*pe)->type(); | |
6580 | if (!Type::are_compatible_for_binop(t, t1)) | |
6581 | { | |
6582 | this->report_error("incompatible types in binary expression"); | |
6583 | return; | |
6584 | } | |
6585 | if (!Binary_expression::check_operator_type(OPERATOR_PLUS, t, t1, | |
6586 | this->location())) | |
6587 | { | |
6588 | this->set_is_error(); | |
6589 | return; | |
6590 | } | |
6591 | } | |
6592 | } | |
6593 | ||
6594 | Expression* | |
6595 | String_concat_expression::do_flatten(Gogo*, Named_object*, | |
6596 | Statement_inserter*) | |
6597 | { | |
6598 | if (this->is_error_expression()) | |
6599 | return this; | |
6600 | Location loc = this->location(); | |
6601 | Type* type = this->type(); | |
6602 | Expression* nil_arg = Expression::make_nil(loc); | |
6603 | Expression* call; | |
6604 | switch (this->exprs_->size()) | |
6605 | { | |
6606 | case 0: case 1: | |
6607 | go_unreachable(); | |
6608 | ||
6609 | case 2: case 3: case 4: case 5: | |
6610 | { | |
6611 | Expression* len = Expression::make_integer_ul(this->exprs_->size(), | |
6612 | NULL, loc); | |
6613 | Array_type* arg_type = Type::make_array_type(type, len); | |
6614 | arg_type->set_is_array_incomparable(); | |
6615 | Expression* arg = | |
6616 | Expression::make_array_composite_literal(arg_type, this->exprs_, | |
6617 | loc); | |
6618 | Runtime::Function code; | |
6619 | switch (this->exprs_->size()) | |
6620 | { | |
6621 | default: | |
6622 | go_unreachable(); | |
6623 | case 2: | |
6624 | code = Runtime::CONCATSTRING2; | |
6625 | break; | |
6626 | case 3: | |
6627 | code = Runtime::CONCATSTRING3; | |
6628 | break; | |
6629 | case 4: | |
6630 | code = Runtime::CONCATSTRING4; | |
6631 | break; | |
6632 | case 5: | |
6633 | code = Runtime::CONCATSTRING5; | |
6634 | break; | |
6635 | } | |
6636 | call = Runtime::make_call(code, loc, 2, nil_arg, arg); | |
6637 | } | |
6638 | break; | |
6639 | ||
6640 | default: | |
6641 | { | |
6642 | Type* arg_type = Type::make_array_type(type, NULL); | |
6643 | Slice_construction_expression* sce = | |
6644 | Expression::make_slice_composite_literal(arg_type, this->exprs_, | |
6645 | loc); | |
6646 | sce->set_storage_does_not_escape(); | |
6647 | call = Runtime::make_call(Runtime::CONCATSTRINGS, loc, 2, nil_arg, | |
6648 | sce); | |
6649 | } | |
6650 | break; | |
6651 | } | |
6652 | ||
6653 | return Expression::make_cast(type, call, loc); | |
6654 | } | |
6655 | ||
6656 | void | |
6657 | String_concat_expression::do_dump_expression( | |
6658 | Ast_dump_context* ast_dump_context) const | |
6659 | { | |
6660 | ast_dump_context->ostream() << "concat("; | |
6661 | ast_dump_context->dump_expression_list(this->exprs_, false); | |
6662 | ast_dump_context->ostream() << ")"; | |
6663 | } | |
6664 | ||
6665 | Expression* | |
6666 | Expression::make_string_concat(Expression_list* exprs) | |
6667 | { | |
6668 | return new String_concat_expression(exprs); | |
6669 | } | |
6670 | ||
e440a328 | 6671 | // Class Bound_method_expression. |
6672 | ||
6673 | // Traversal. | |
6674 | ||
6675 | int | |
6676 | Bound_method_expression::do_traverse(Traverse* traverse) | |
6677 | { | |
e0659c9e | 6678 | return Expression::traverse(&this->expr_, traverse); |
e440a328 | 6679 | } |
6680 | ||
6681 | // Return the type of a bound method expression. The type of this | |
0afbb937 | 6682 | // object is simply the type of the method with no receiver. |
e440a328 | 6683 | |
6684 | Type* | |
6685 | Bound_method_expression::do_type() | |
6686 | { | |
0afbb937 | 6687 | Named_object* fn = this->method_->named_object(); |
6688 | Function_type* fntype; | |
6689 | if (fn->is_function()) | |
6690 | fntype = fn->func_value()->type(); | |
6691 | else if (fn->is_function_declaration()) | |
6692 | fntype = fn->func_declaration_value()->type(); | |
e0659c9e | 6693 | else |
6694 | return Type::make_error_type(); | |
0afbb937 | 6695 | return fntype->copy_without_receiver(); |
e440a328 | 6696 | } |
6697 | ||
6698 | // Determine the types of a method expression. | |
6699 | ||
6700 | void | |
6701 | Bound_method_expression::do_determine_type(const Type_context*) | |
6702 | { | |
0afbb937 | 6703 | Named_object* fn = this->method_->named_object(); |
6704 | Function_type* fntype; | |
6705 | if (fn->is_function()) | |
6706 | fntype = fn->func_value()->type(); | |
6707 | else if (fn->is_function_declaration()) | |
6708 | fntype = fn->func_declaration_value()->type(); | |
6709 | else | |
6710 | fntype = NULL; | |
e440a328 | 6711 | if (fntype == NULL || !fntype->is_method()) |
6712 | this->expr_->determine_type_no_context(); | |
6713 | else | |
6714 | { | |
6715 | Type_context subcontext(fntype->receiver()->type(), false); | |
6716 | this->expr_->determine_type(&subcontext); | |
6717 | } | |
6718 | } | |
6719 | ||
6720 | // Check the types of a method expression. | |
6721 | ||
6722 | void | |
6723 | Bound_method_expression::do_check_types(Gogo*) | |
6724 | { | |
0afbb937 | 6725 | Named_object* fn = this->method_->named_object(); |
6726 | if (!fn->is_function() && !fn->is_function_declaration()) | |
6727 | { | |
6728 | this->report_error(_("object is not a method")); | |
6729 | return; | |
6730 | } | |
6731 | ||
6732 | Function_type* fntype; | |
6733 | if (fn->is_function()) | |
6734 | fntype = fn->func_value()->type(); | |
6735 | else if (fn->is_function_declaration()) | |
6736 | fntype = fn->func_declaration_value()->type(); | |
e440a328 | 6737 | else |
0afbb937 | 6738 | go_unreachable(); |
6739 | Type* rtype = fntype->receiver()->type()->deref(); | |
6740 | Type* etype = (this->expr_type_ != NULL | |
6741 | ? this->expr_type_ | |
6742 | : this->expr_->type()); | |
6743 | etype = etype->deref(); | |
6744 | if (!Type::are_identical(rtype, etype, true, NULL)) | |
6745 | this->report_error(_("method type does not match object type")); | |
6746 | } | |
6747 | ||
6748 | // If a bound method expression is not simply called, then it is | |
6749 | // represented as a closure. The closure will hold a single variable, | |
6750 | // the receiver to pass to the method. The function will be a simple | |
6751 | // thunk that pulls that value from the closure and calls the method | |
6752 | // with the remaining arguments. | |
6753 | // | |
6754 | // Because method values are not common, we don't build all thunks for | |
6755 | // every methods, but instead only build them as we need them. In | |
6756 | // particular, we even build them on demand for methods defined in | |
6757 | // other packages. | |
6758 | ||
6759 | Bound_method_expression::Method_value_thunks | |
6760 | Bound_method_expression::method_value_thunks; | |
6761 | ||
6762 | // Find or create the thunk for METHOD. | |
6763 | ||
6764 | Named_object* | |
6765 | Bound_method_expression::create_thunk(Gogo* gogo, const Method* method, | |
6766 | Named_object* fn) | |
6767 | { | |
6768 | std::pair<Named_object*, Named_object*> val(fn, NULL); | |
6769 | std::pair<Method_value_thunks::iterator, bool> ins = | |
6770 | Bound_method_expression::method_value_thunks.insert(val); | |
6771 | if (!ins.second) | |
6772 | { | |
6773 | // We have seen this method before. | |
6774 | go_assert(ins.first->second != NULL); | |
6775 | return ins.first->second; | |
6776 | } | |
6777 | ||
6778 | Location loc = fn->location(); | |
6779 | ||
6780 | Function_type* orig_fntype; | |
6781 | if (fn->is_function()) | |
6782 | orig_fntype = fn->func_value()->type(); | |
6783 | else if (fn->is_function_declaration()) | |
6784 | orig_fntype = fn->func_declaration_value()->type(); | |
6785 | else | |
6786 | orig_fntype = NULL; | |
6787 | ||
6788 | if (orig_fntype == NULL || !orig_fntype->is_method()) | |
e440a328 | 6789 | { |
0afbb937 | 6790 | ins.first->second = Named_object::make_erroneous_name(Gogo::thunk_name()); |
6791 | return ins.first->second; | |
e440a328 | 6792 | } |
0afbb937 | 6793 | |
6794 | Struct_field_list* sfl = new Struct_field_list(); | |
f8bdf81a | 6795 | // The type here is wrong--it should be the C function type. But it |
6796 | // doesn't really matter. | |
0afbb937 | 6797 | Type* vt = Type::make_pointer_type(Type::make_void_type()); |
6798 | sfl->push_back(Struct_field(Typed_identifier("fn.0", vt, loc))); | |
6799 | sfl->push_back(Struct_field(Typed_identifier("val.1", | |
6800 | orig_fntype->receiver()->type(), | |
6801 | loc))); | |
6bf4793c | 6802 | Struct_type* st = Type::make_struct_type(sfl, loc); |
6803 | st->set_is_struct_incomparable(); | |
6804 | Type* closure_type = Type::make_pointer_type(st); | |
0afbb937 | 6805 | |
f8bdf81a | 6806 | Function_type* new_fntype = orig_fntype->copy_with_names(); |
0afbb937 | 6807 | |
da244e59 | 6808 | std::string thunk_name = Gogo::thunk_name(); |
6809 | Named_object* new_no = gogo->start_function(thunk_name, new_fntype, | |
0afbb937 | 6810 | false, loc); |
6811 | ||
f8bdf81a | 6812 | Variable* cvar = new Variable(closure_type, NULL, false, false, false, loc); |
6813 | cvar->set_is_used(); | |
1ecc6157 | 6814 | cvar->set_is_closure(); |
da244e59 | 6815 | Named_object* cp = Named_object::make_variable("$closure" + thunk_name, |
6816 | NULL, cvar); | |
f8bdf81a | 6817 | new_no->func_value()->set_closure_var(cp); |
0afbb937 | 6818 | |
f8bdf81a | 6819 | gogo->start_block(loc); |
0afbb937 | 6820 | |
6821 | // Field 0 of the closure is the function code pointer, field 1 is | |
6822 | // the value on which to invoke the method. | |
6823 | Expression* arg = Expression::make_var_reference(cp, loc); | |
6824 | arg = Expression::make_unary(OPERATOR_MULT, arg, loc); | |
6825 | arg = Expression::make_field_reference(arg, 1, loc); | |
6826 | ||
6827 | Expression* bme = Expression::make_bound_method(arg, method, fn, loc); | |
6828 | ||
6829 | const Typed_identifier_list* orig_params = orig_fntype->parameters(); | |
6830 | Expression_list* args; | |
6831 | if (orig_params == NULL || orig_params->empty()) | |
6832 | args = NULL; | |
6833 | else | |
6834 | { | |
6835 | const Typed_identifier_list* new_params = new_fntype->parameters(); | |
6836 | args = new Expression_list(); | |
6837 | for (Typed_identifier_list::const_iterator p = new_params->begin(); | |
f8bdf81a | 6838 | p != new_params->end(); |
0afbb937 | 6839 | ++p) |
6840 | { | |
6841 | Named_object* p_no = gogo->lookup(p->name(), NULL); | |
6842 | go_assert(p_no != NULL | |
6843 | && p_no->is_variable() | |
6844 | && p_no->var_value()->is_parameter()); | |
6845 | args->push_back(Expression::make_var_reference(p_no, loc)); | |
6846 | } | |
6847 | } | |
6848 | ||
6849 | Call_expression* call = Expression::make_call(bme, args, | |
6850 | orig_fntype->is_varargs(), | |
6851 | loc); | |
6852 | call->set_varargs_are_lowered(); | |
6853 | ||
6854 | Statement* s = Statement::make_return_from_call(call, loc); | |
6855 | gogo->add_statement(s); | |
6856 | Block* b = gogo->finish_block(loc); | |
6857 | gogo->add_block(b, loc); | |
6858 | gogo->lower_block(new_no, b); | |
a32698ee | 6859 | gogo->flatten_block(new_no, b); |
0afbb937 | 6860 | gogo->finish_function(loc); |
6861 | ||
6862 | ins.first->second = new_no; | |
6863 | return new_no; | |
6864 | } | |
6865 | ||
6866 | // Return an expression to check *REF for nil while dereferencing | |
6867 | // according to FIELD_INDEXES. Update *REF to build up the field | |
6868 | // reference. This is a static function so that we don't have to | |
6869 | // worry about declaring Field_indexes in expressions.h. | |
6870 | ||
6871 | static Expression* | |
6872 | bme_check_nil(const Method::Field_indexes* field_indexes, Location loc, | |
6873 | Expression** ref) | |
6874 | { | |
6875 | if (field_indexes == NULL) | |
6876 | return Expression::make_boolean(false, loc); | |
6877 | Expression* cond = bme_check_nil(field_indexes->next, loc, ref); | |
6878 | Struct_type* stype = (*ref)->type()->deref()->struct_type(); | |
6879 | go_assert(stype != NULL | |
6880 | && field_indexes->field_index < stype->field_count()); | |
6881 | if ((*ref)->type()->struct_type() == NULL) | |
6882 | { | |
6883 | go_assert((*ref)->type()->points_to() != NULL); | |
6884 | Expression* n = Expression::make_binary(OPERATOR_EQEQ, *ref, | |
6885 | Expression::make_nil(loc), | |
6886 | loc); | |
6887 | cond = Expression::make_binary(OPERATOR_OROR, cond, n, loc); | |
6888 | *ref = Expression::make_unary(OPERATOR_MULT, *ref, loc); | |
6889 | go_assert((*ref)->type()->struct_type() == stype); | |
6890 | } | |
6891 | *ref = Expression::make_field_reference(*ref, field_indexes->field_index, | |
6892 | loc); | |
6893 | return cond; | |
e440a328 | 6894 | } |
6895 | ||
cd39797e | 6896 | // Flatten a method value into a struct with nil checks. We can't do |
6897 | // this in the lowering phase, because if the method value is called | |
6898 | // directly we don't need a thunk. That case will have been handled | |
6899 | // by Call_expression::do_lower, so if we get here then we do need a | |
6900 | // thunk. | |
e440a328 | 6901 | |
cd39797e | 6902 | Expression* |
6903 | Bound_method_expression::do_flatten(Gogo* gogo, Named_object*, | |
6904 | Statement_inserter* inserter) | |
e440a328 | 6905 | { |
cd39797e | 6906 | Location loc = this->location(); |
6907 | ||
6908 | Named_object* thunk = Bound_method_expression::create_thunk(gogo, | |
0afbb937 | 6909 | this->method_, |
6910 | this->function_); | |
6911 | if (thunk->is_erroneous()) | |
6912 | { | |
6913 | go_assert(saw_errors()); | |
cd39797e | 6914 | return Expression::make_error(loc); |
0afbb937 | 6915 | } |
6916 | ||
cd39797e | 6917 | // Force the expression into a variable. This is only necessary if |
6918 | // we are going to do nil checks below, but it's easy enough to | |
6919 | // always do it. | |
6920 | Expression* expr = this->expr_; | |
6921 | if (!expr->is_variable()) | |
6922 | { | |
6923 | Temporary_statement* etemp = Statement::make_temporary(NULL, expr, loc); | |
6924 | inserter->insert(etemp); | |
6925 | expr = Expression::make_temporary_reference(etemp, loc); | |
6926 | } | |
0afbb937 | 6927 | |
6928 | // If the method expects a value, and we have a pointer, we need to | |
6929 | // dereference the pointer. | |
6930 | ||
6931 | Named_object* fn = this->method_->named_object(); | |
cd39797e | 6932 | Function_type *fntype; |
0afbb937 | 6933 | if (fn->is_function()) |
6934 | fntype = fn->func_value()->type(); | |
6935 | else if (fn->is_function_declaration()) | |
6936 | fntype = fn->func_declaration_value()->type(); | |
6937 | else | |
6938 | go_unreachable(); | |
6939 | ||
cd39797e | 6940 | Expression* val = expr; |
0afbb937 | 6941 | if (fntype->receiver()->type()->points_to() == NULL |
6942 | && val->type()->points_to() != NULL) | |
6943 | val = Expression::make_unary(OPERATOR_MULT, val, loc); | |
6944 | ||
6945 | // Note that we are ignoring this->expr_type_ here. The thunk will | |
6946 | // expect a closure whose second field has type this->expr_type_ (if | |
6947 | // that is not NULL). We are going to pass it a closure whose | |
6948 | // second field has type this->expr_->type(). Since | |
6949 | // this->expr_type_ is only not-NULL for pointer types, we can get | |
6950 | // away with this. | |
6951 | ||
6952 | Struct_field_list* fields = new Struct_field_list(); | |
6953 | fields->push_back(Struct_field(Typed_identifier("fn.0", | |
6954 | thunk->func_value()->type(), | |
6955 | loc))); | |
6956 | fields->push_back(Struct_field(Typed_identifier("val.1", val->type(), loc))); | |
6957 | Struct_type* st = Type::make_struct_type(fields, loc); | |
6bf4793c | 6958 | st->set_is_struct_incomparable(); |
0afbb937 | 6959 | |
6960 | Expression_list* vals = new Expression_list(); | |
6961 | vals->push_back(Expression::make_func_code_reference(thunk, loc)); | |
6962 | vals->push_back(val); | |
6963 | ||
6964 | Expression* ret = Expression::make_struct_composite_literal(st, vals, loc); | |
0afbb937 | 6965 | |
cd39797e | 6966 | if (!gogo->compiling_runtime() || gogo->package_name() != "runtime") |
6967 | ret = Expression::make_heap_expression(ret, loc); | |
6968 | else | |
6969 | { | |
6970 | // When compiling the runtime, method closures do not escape. | |
6971 | // When escape analysis becomes the default, and applies to | |
6972 | // method closures, this should be changed to make it an error | |
6973 | // if a method closure escapes. | |
6974 | Temporary_statement* ctemp = Statement::make_temporary(st, ret, loc); | |
6975 | inserter->insert(ctemp); | |
6976 | ret = Expression::make_temporary_reference(ctemp, loc); | |
6977 | ret = Expression::make_unary(OPERATOR_AND, ret, loc); | |
6978 | ret->unary_expression()->set_does_not_escape(); | |
6979 | } | |
6980 | ||
6981 | // If necessary, check whether the expression or any embedded | |
6982 | // pointers are nil. | |
0afbb937 | 6983 | |
df7ef1fd | 6984 | Expression* nil_check = NULL; |
0afbb937 | 6985 | if (this->method_->field_indexes() != NULL) |
6986 | { | |
0afbb937 | 6987 | Expression* ref = expr; |
6988 | nil_check = bme_check_nil(this->method_->field_indexes(), loc, &ref); | |
6989 | expr = ref; | |
6990 | } | |
6991 | ||
6992 | if (this->method_->is_value_method() && expr->type()->points_to() != NULL) | |
6993 | { | |
6994 | Expression* n = Expression::make_binary(OPERATOR_EQEQ, expr, | |
6995 | Expression::make_nil(loc), | |
6996 | loc); | |
6997 | if (nil_check == NULL) | |
6998 | nil_check = n; | |
6999 | else | |
7000 | nil_check = Expression::make_binary(OPERATOR_OROR, nil_check, n, loc); | |
7001 | } | |
7002 | ||
7003 | if (nil_check != NULL) | |
7004 | { | |
cd39797e | 7005 | Expression* crash = gogo->runtime_error(RUNTIME_ERROR_NIL_DEREFERENCE, |
7006 | loc); | |
7007 | // Fix the type of the conditional expression by pretending to | |
7008 | // evaluate to RET either way through the conditional. | |
7009 | crash = Expression::make_compound(crash, ret, loc); | |
7010 | ret = Expression::make_conditional(nil_check, crash, ret, loc); | |
7011 | } | |
7012 | ||
7013 | // RET is a pointer to a struct, but we want a function type. | |
7014 | ret = Expression::make_unsafe_cast(this->type(), ret, loc); | |
7015 | ||
7016 | return ret; | |
e440a328 | 7017 | } |
7018 | ||
d751bb78 | 7019 | // Dump ast representation of a bound method expression. |
7020 | ||
7021 | void | |
7022 | Bound_method_expression::do_dump_expression(Ast_dump_context* ast_dump_context) | |
7023 | const | |
7024 | { | |
7025 | if (this->expr_type_ != NULL) | |
7026 | ast_dump_context->ostream() << "("; | |
7027 | ast_dump_context->dump_expression(this->expr_); | |
7028 | if (this->expr_type_ != NULL) | |
7029 | { | |
7030 | ast_dump_context->ostream() << ":"; | |
7031 | ast_dump_context->dump_type(this->expr_type_); | |
7032 | ast_dump_context->ostream() << ")"; | |
7033 | } | |
7034 | ||
0afbb937 | 7035 | ast_dump_context->ostream() << "." << this->function_->name(); |
d751bb78 | 7036 | } |
7037 | ||
e440a328 | 7038 | // Make a method expression. |
7039 | ||
7040 | Bound_method_expression* | |
0afbb937 | 7041 | Expression::make_bound_method(Expression* expr, const Method* method, |
7042 | Named_object* function, Location location) | |
e440a328 | 7043 | { |
0afbb937 | 7044 | return new Bound_method_expression(expr, method, function, location); |
e440a328 | 7045 | } |
7046 | ||
7047 | // Class Builtin_call_expression. This is used for a call to a | |
7048 | // builtin function. | |
7049 | ||
7050 | class Builtin_call_expression : public Call_expression | |
7051 | { | |
7052 | public: | |
7053 | Builtin_call_expression(Gogo* gogo, Expression* fn, Expression_list* args, | |
b13c66cd | 7054 | bool is_varargs, Location location); |
e440a328 | 7055 | |
7056 | protected: | |
7057 | // This overrides Call_expression::do_lower. | |
7058 | Expression* | |
ceeb4318 | 7059 | do_lower(Gogo*, Named_object*, Statement_inserter*, int); |
e440a328 | 7060 | |
35a54f17 | 7061 | Expression* |
7062 | do_flatten(Gogo*, Named_object*, Statement_inserter*); | |
7063 | ||
e440a328 | 7064 | bool |
7065 | do_is_constant() const; | |
7066 | ||
7067 | bool | |
0c77715b | 7068 | do_numeric_constant_value(Numeric_constant*) const; |
e440a328 | 7069 | |
4f2138d7 | 7070 | bool |
a7549a6a | 7071 | do_discarding_value(); |
7072 | ||
e440a328 | 7073 | Type* |
7074 | do_type(); | |
7075 | ||
7076 | void | |
7077 | do_determine_type(const Type_context*); | |
7078 | ||
7079 | void | |
7080 | do_check_types(Gogo*); | |
7081 | ||
7082 | Expression* | |
72666aed | 7083 | do_copy(); |
e440a328 | 7084 | |
ea664253 | 7085 | Bexpression* |
7086 | do_get_backend(Translate_context*); | |
e440a328 | 7087 | |
7088 | void | |
7089 | do_export(Export*) const; | |
7090 | ||
7091 | virtual bool | |
7092 | do_is_recover_call() const; | |
7093 | ||
7094 | virtual void | |
7095 | do_set_recover_arg(Expression*); | |
7096 | ||
7097 | private: | |
7098 | // The builtin functions. | |
7099 | enum Builtin_function_code | |
7100 | { | |
7101 | BUILTIN_INVALID, | |
7102 | ||
7103 | // Predeclared builtin functions. | |
7104 | BUILTIN_APPEND, | |
7105 | BUILTIN_CAP, | |
7106 | BUILTIN_CLOSE, | |
48080209 | 7107 | BUILTIN_COMPLEX, |
e440a328 | 7108 | BUILTIN_COPY, |
1cce762f | 7109 | BUILTIN_DELETE, |
e440a328 | 7110 | BUILTIN_IMAG, |
7111 | BUILTIN_LEN, | |
7112 | BUILTIN_MAKE, | |
7113 | BUILTIN_NEW, | |
7114 | BUILTIN_PANIC, | |
7115 | BUILTIN_PRINT, | |
7116 | BUILTIN_PRINTLN, | |
7117 | BUILTIN_REAL, | |
7118 | BUILTIN_RECOVER, | |
7119 | ||
7120 | // Builtin functions from the unsafe package. | |
7121 | BUILTIN_ALIGNOF, | |
7122 | BUILTIN_OFFSETOF, | |
7123 | BUILTIN_SIZEOF | |
7124 | }; | |
7125 | ||
7126 | Expression* | |
7127 | one_arg() const; | |
7128 | ||
7129 | bool | |
7130 | check_one_arg(); | |
7131 | ||
7132 | static Type* | |
7133 | real_imag_type(Type*); | |
7134 | ||
7135 | static Type* | |
48080209 | 7136 | complex_type(Type*); |
e440a328 | 7137 | |
a9182619 | 7138 | Expression* |
321e5ad2 | 7139 | lower_make(Statement_inserter*); |
7140 | ||
7141 | Expression* flatten_append(Gogo*, Named_object*, Statement_inserter*); | |
a9182619 | 7142 | |
7143 | bool | |
ccea2b36 | 7144 | check_int_value(Expression*, bool is_length, bool* small); |
a9182619 | 7145 | |
e440a328 | 7146 | // A pointer back to the general IR structure. This avoids a global |
7147 | // variable, or passing it around everywhere. | |
7148 | Gogo* gogo_; | |
7149 | // The builtin function being called. | |
7150 | Builtin_function_code code_; | |
0f914071 | 7151 | // Used to stop endless loops when the length of an array uses len |
7152 | // or cap of the array itself. | |
7153 | mutable bool seen_; | |
6334270b | 7154 | // Whether the argument is set for calls to BUILTIN_RECOVER. |
7155 | bool recover_arg_is_set_; | |
e440a328 | 7156 | }; |
7157 | ||
7158 | Builtin_call_expression::Builtin_call_expression(Gogo* gogo, | |
7159 | Expression* fn, | |
7160 | Expression_list* args, | |
7161 | bool is_varargs, | |
b13c66cd | 7162 | Location location) |
e440a328 | 7163 | : Call_expression(fn, args, is_varargs, location), |
6334270b | 7164 | gogo_(gogo), code_(BUILTIN_INVALID), seen_(false), |
7165 | recover_arg_is_set_(false) | |
e440a328 | 7166 | { |
7167 | Func_expression* fnexp = this->fn()->func_expression(); | |
79651b1f | 7168 | if (fnexp == NULL) |
7169 | { | |
7170 | this->code_ = BUILTIN_INVALID; | |
7171 | return; | |
7172 | } | |
e440a328 | 7173 | const std::string& name(fnexp->named_object()->name()); |
7174 | if (name == "append") | |
7175 | this->code_ = BUILTIN_APPEND; | |
7176 | else if (name == "cap") | |
7177 | this->code_ = BUILTIN_CAP; | |
7178 | else if (name == "close") | |
7179 | this->code_ = BUILTIN_CLOSE; | |
48080209 | 7180 | else if (name == "complex") |
7181 | this->code_ = BUILTIN_COMPLEX; | |
e440a328 | 7182 | else if (name == "copy") |
7183 | this->code_ = BUILTIN_COPY; | |
1cce762f | 7184 | else if (name == "delete") |
7185 | this->code_ = BUILTIN_DELETE; | |
e440a328 | 7186 | else if (name == "imag") |
7187 | this->code_ = BUILTIN_IMAG; | |
7188 | else if (name == "len") | |
7189 | this->code_ = BUILTIN_LEN; | |
7190 | else if (name == "make") | |
7191 | this->code_ = BUILTIN_MAKE; | |
7192 | else if (name == "new") | |
7193 | this->code_ = BUILTIN_NEW; | |
7194 | else if (name == "panic") | |
7195 | this->code_ = BUILTIN_PANIC; | |
7196 | else if (name == "print") | |
7197 | this->code_ = BUILTIN_PRINT; | |
7198 | else if (name == "println") | |
7199 | this->code_ = BUILTIN_PRINTLN; | |
7200 | else if (name == "real") | |
7201 | this->code_ = BUILTIN_REAL; | |
7202 | else if (name == "recover") | |
7203 | this->code_ = BUILTIN_RECOVER; | |
7204 | else if (name == "Alignof") | |
7205 | this->code_ = BUILTIN_ALIGNOF; | |
7206 | else if (name == "Offsetof") | |
7207 | this->code_ = BUILTIN_OFFSETOF; | |
7208 | else if (name == "Sizeof") | |
7209 | this->code_ = BUILTIN_SIZEOF; | |
7210 | else | |
c3e6f413 | 7211 | go_unreachable(); |
e440a328 | 7212 | } |
7213 | ||
7214 | // Return whether this is a call to recover. This is a virtual | |
7215 | // function called from the parent class. | |
7216 | ||
7217 | bool | |
7218 | Builtin_call_expression::do_is_recover_call() const | |
7219 | { | |
7220 | if (this->classification() == EXPRESSION_ERROR) | |
7221 | return false; | |
7222 | return this->code_ == BUILTIN_RECOVER; | |
7223 | } | |
7224 | ||
7225 | // Set the argument for a call to recover. | |
7226 | ||
7227 | void | |
7228 | Builtin_call_expression::do_set_recover_arg(Expression* arg) | |
7229 | { | |
7230 | const Expression_list* args = this->args(); | |
c484d925 | 7231 | go_assert(args == NULL || args->empty()); |
e440a328 | 7232 | Expression_list* new_args = new Expression_list(); |
7233 | new_args->push_back(arg); | |
7234 | this->set_args(new_args); | |
6334270b | 7235 | this->recover_arg_is_set_ = true; |
e440a328 | 7236 | } |
7237 | ||
e440a328 | 7238 | // Lower a builtin call expression. This turns new and make into |
7239 | // specific expressions. We also convert to a constant if we can. | |
7240 | ||
7241 | Expression* | |
321e5ad2 | 7242 | Builtin_call_expression::do_lower(Gogo*, Named_object* function, |
ceeb4318 | 7243 | Statement_inserter* inserter, int) |
e440a328 | 7244 | { |
79651b1f | 7245 | if (this->is_error_expression()) |
a9182619 | 7246 | return this; |
7247 | ||
b13c66cd | 7248 | Location loc = this->location(); |
1cce762f | 7249 | |
a8725655 | 7250 | if (this->is_varargs() && this->code_ != BUILTIN_APPEND) |
7251 | { | |
7252 | this->report_error(_("invalid use of %<...%> with builtin function")); | |
1cce762f | 7253 | return Expression::make_error(loc); |
a8725655 | 7254 | } |
7255 | ||
393ba00b | 7256 | if (this->code_ == BUILTIN_OFFSETOF) |
7257 | { | |
7258 | Expression* arg = this->one_arg(); | |
12e69faa | 7259 | |
7260 | if (arg->bound_method_expression() != NULL | |
7261 | || arg->interface_field_reference_expression() != NULL) | |
7262 | { | |
7263 | this->report_error(_("invalid use of method value as argument " | |
7264 | "of Offsetof")); | |
7265 | return this; | |
7266 | } | |
7267 | ||
393ba00b | 7268 | Field_reference_expression* farg = arg->field_reference_expression(); |
7269 | while (farg != NULL) | |
7270 | { | |
7271 | if (!farg->implicit()) | |
7272 | break; | |
7273 | // When the selector refers to an embedded field, | |
7274 | // it must not be reached through pointer indirections. | |
7275 | if (farg->expr()->deref() != farg->expr()) | |
7276 | { | |
12e69faa | 7277 | this->report_error(_("argument of Offsetof implies " |
7278 | "indirection of an embedded field")); | |
393ba00b | 7279 | return this; |
7280 | } | |
7281 | // Go up until we reach the original base. | |
7282 | farg = farg->expr()->field_reference_expression(); | |
7283 | } | |
7284 | } | |
7285 | ||
1cce762f | 7286 | if (this->is_constant()) |
e440a328 | 7287 | { |
0c77715b | 7288 | Numeric_constant nc; |
7289 | if (this->numeric_constant_value(&nc)) | |
7290 | return nc.expression(loc); | |
e440a328 | 7291 | } |
1cce762f | 7292 | |
7293 | switch (this->code_) | |
e440a328 | 7294 | { |
1cce762f | 7295 | default: |
7296 | break; | |
7297 | ||
7298 | case BUILTIN_NEW: | |
7299 | { | |
7300 | const Expression_list* args = this->args(); | |
7301 | if (args == NULL || args->size() < 1) | |
7302 | this->report_error(_("not enough arguments")); | |
7303 | else if (args->size() > 1) | |
7304 | this->report_error(_("too many arguments")); | |
7305 | else | |
7306 | { | |
7307 | Expression* arg = args->front(); | |
7308 | if (!arg->is_type_expression()) | |
7309 | { | |
631d5788 | 7310 | go_error_at(arg->location(), "expected type"); |
1cce762f | 7311 | this->set_is_error(); |
7312 | } | |
7313 | else | |
7314 | return Expression::make_allocation(arg->type(), loc); | |
7315 | } | |
7316 | } | |
7317 | break; | |
7318 | ||
7319 | case BUILTIN_MAKE: | |
321e5ad2 | 7320 | return this->lower_make(inserter); |
1cce762f | 7321 | |
7322 | case BUILTIN_RECOVER: | |
e440a328 | 7323 | if (function != NULL) |
7324 | function->func_value()->set_calls_recover(); | |
7325 | else | |
7326 | { | |
7327 | // Calling recover outside of a function always returns the | |
7328 | // nil empty interface. | |
823c7e3d | 7329 | Type* eface = Type::make_empty_interface_type(loc); |
1cce762f | 7330 | return Expression::make_cast(eface, Expression::make_nil(loc), loc); |
e440a328 | 7331 | } |
1cce762f | 7332 | break; |
7333 | ||
1cce762f | 7334 | case BUILTIN_DELETE: |
7335 | { | |
7336 | // Lower to a runtime function call. | |
7337 | const Expression_list* args = this->args(); | |
7338 | if (args == NULL || args->size() < 2) | |
7339 | this->report_error(_("not enough arguments")); | |
7340 | else if (args->size() > 2) | |
7341 | this->report_error(_("too many arguments")); | |
7342 | else if (args->front()->type()->map_type() == NULL) | |
7343 | this->report_error(_("argument 1 must be a map")); | |
7344 | else | |
7345 | { | |
7346 | // Since this function returns no value it must appear in | |
7347 | // a statement by itself, so we don't have to worry about | |
7348 | // order of evaluation of values around it. Evaluate the | |
7349 | // map first to get order of evaluation right. | |
7350 | Map_type* mt = args->front()->type()->map_type(); | |
7351 | Temporary_statement* map_temp = | |
7352 | Statement::make_temporary(mt, args->front(), loc); | |
7353 | inserter->insert(map_temp); | |
7354 | ||
7355 | Temporary_statement* key_temp = | |
7356 | Statement::make_temporary(mt->key_type(), args->back(), loc); | |
7357 | inserter->insert(key_temp); | |
7358 | ||
0d5530d9 | 7359 | Expression* e1 = Expression::make_type_descriptor(mt, loc); |
7360 | Expression* e2 = Expression::make_temporary_reference(map_temp, | |
1cce762f | 7361 | loc); |
0d5530d9 | 7362 | Expression* e3 = Expression::make_temporary_reference(key_temp, |
1cce762f | 7363 | loc); |
0d5530d9 | 7364 | e3 = Expression::make_unary(OPERATOR_AND, e3, loc); |
1cce762f | 7365 | return Runtime::make_call(Runtime::MAPDELETE, this->location(), |
0d5530d9 | 7366 | 3, e1, e2, e3); |
1cce762f | 7367 | } |
7368 | } | |
7369 | break; | |
88b03a70 | 7370 | |
7371 | case BUILTIN_PRINT: | |
7372 | case BUILTIN_PRINTLN: | |
7373 | // Force all the arguments into temporary variables, so that we | |
7374 | // don't try to evaluate something while holding the print lock. | |
7375 | if (this->args() == NULL) | |
7376 | break; | |
7377 | for (Expression_list::iterator pa = this->args()->begin(); | |
7378 | pa != this->args()->end(); | |
7379 | ++pa) | |
7380 | { | |
493ce3ee | 7381 | if (!(*pa)->is_variable() && !(*pa)->is_constant()) |
88b03a70 | 7382 | { |
7383 | Temporary_statement* temp = | |
7384 | Statement::make_temporary(NULL, *pa, loc); | |
7385 | inserter->insert(temp); | |
7386 | *pa = Expression::make_temporary_reference(temp, loc); | |
7387 | } | |
7388 | } | |
7389 | break; | |
e440a328 | 7390 | } |
7391 | ||
7392 | return this; | |
7393 | } | |
7394 | ||
35a54f17 | 7395 | // Flatten a builtin call expression. This turns the arguments of copy and |
7396 | // append into temporary expressions. | |
7397 | ||
7398 | Expression* | |
321e5ad2 | 7399 | Builtin_call_expression::do_flatten(Gogo* gogo, Named_object* function, |
35a54f17 | 7400 | Statement_inserter* inserter) |
7401 | { | |
16cb7fec | 7402 | Location loc = this->location(); |
7403 | ||
7404 | switch (this->code_) | |
35a54f17 | 7405 | { |
16cb7fec | 7406 | default: |
7407 | break; | |
7408 | ||
7409 | case BUILTIN_APPEND: | |
321e5ad2 | 7410 | return this->flatten_append(gogo, function, inserter); |
7411 | ||
16cb7fec | 7412 | case BUILTIN_COPY: |
7413 | { | |
7414 | Type* at = this->args()->front()->type(); | |
7415 | for (Expression_list::iterator pa = this->args()->begin(); | |
7416 | pa != this->args()->end(); | |
7417 | ++pa) | |
7418 | { | |
7419 | if ((*pa)->is_nil_expression()) | |
7420 | { | |
7421 | Expression* nil = Expression::make_nil(loc); | |
7422 | Expression* zero = Expression::make_integer_ul(0, NULL, loc); | |
7423 | *pa = Expression::make_slice_value(at, nil, zero, zero, loc); | |
7424 | } | |
7425 | if (!(*pa)->is_variable()) | |
7426 | { | |
7427 | Temporary_statement* temp = | |
7428 | Statement::make_temporary(NULL, *pa, loc); | |
7429 | inserter->insert(temp); | |
7430 | *pa = Expression::make_temporary_reference(temp, loc); | |
7431 | } | |
7432 | } | |
7433 | } | |
7434 | break; | |
7435 | ||
7436 | case BUILTIN_PANIC: | |
35a54f17 | 7437 | for (Expression_list::iterator pa = this->args()->begin(); |
16cb7fec | 7438 | pa != this->args()->end(); |
7439 | ++pa) | |
7440 | { | |
7441 | if (!(*pa)->is_variable() && (*pa)->type()->interface_type() != NULL) | |
55e8ba6a | 7442 | { |
16cb7fec | 7443 | Temporary_statement* temp = |
7444 | Statement::make_temporary(NULL, *pa, loc); | |
7445 | inserter->insert(temp); | |
7446 | *pa = Expression::make_temporary_reference(temp, loc); | |
55e8ba6a | 7447 | } |
16cb7fec | 7448 | } |
7739537f | 7449 | break; |
0d5530d9 | 7450 | |
7451 | case BUILTIN_LEN: | |
132ed071 | 7452 | case BUILTIN_CAP: |
321e5ad2 | 7453 | { |
7454 | Expression_list::iterator pa = this->args()->begin(); | |
7455 | if (!(*pa)->is_variable() | |
7456 | && ((*pa)->type()->map_type() != NULL | |
7457 | || (*pa)->type()->channel_type() != NULL)) | |
7458 | { | |
7459 | Temporary_statement* temp = | |
7460 | Statement::make_temporary(NULL, *pa, loc); | |
7461 | inserter->insert(temp); | |
7462 | *pa = Expression::make_temporary_reference(temp, loc); | |
7463 | } | |
7464 | } | |
7465 | break; | |
35a54f17 | 7466 | } |
16cb7fec | 7467 | |
35a54f17 | 7468 | return this; |
7469 | } | |
7470 | ||
a9182619 | 7471 | // Lower a make expression. |
7472 | ||
7473 | Expression* | |
321e5ad2 | 7474 | Builtin_call_expression::lower_make(Statement_inserter* inserter) |
a9182619 | 7475 | { |
b13c66cd | 7476 | Location loc = this->location(); |
a9182619 | 7477 | |
7478 | const Expression_list* args = this->args(); | |
7479 | if (args == NULL || args->size() < 1) | |
7480 | { | |
7481 | this->report_error(_("not enough arguments")); | |
7482 | return Expression::make_error(this->location()); | |
7483 | } | |
7484 | ||
7485 | Expression_list::const_iterator parg = args->begin(); | |
7486 | ||
7487 | Expression* first_arg = *parg; | |
7488 | if (!first_arg->is_type_expression()) | |
7489 | { | |
631d5788 | 7490 | go_error_at(first_arg->location(), "expected type"); |
a9182619 | 7491 | this->set_is_error(); |
7492 | return Expression::make_error(this->location()); | |
7493 | } | |
7494 | Type* type = first_arg->type(); | |
7495 | ||
7496 | bool is_slice = false; | |
7497 | bool is_map = false; | |
7498 | bool is_chan = false; | |
411eb89e | 7499 | if (type->is_slice_type()) |
a9182619 | 7500 | is_slice = true; |
7501 | else if (type->map_type() != NULL) | |
7502 | is_map = true; | |
7503 | else if (type->channel_type() != NULL) | |
7504 | is_chan = true; | |
7505 | else | |
7506 | { | |
7507 | this->report_error(_("invalid type for make function")); | |
7508 | return Expression::make_error(this->location()); | |
7509 | } | |
7510 | ||
f6bc81e6 | 7511 | Type_context int_context(Type::lookup_integer_type("int"), false); |
7512 | ||
a9182619 | 7513 | ++parg; |
7514 | Expression* len_arg; | |
ccea2b36 | 7515 | bool len_small = false; |
a9182619 | 7516 | if (parg == args->end()) |
7517 | { | |
7518 | if (is_slice) | |
7519 | { | |
7520 | this->report_error(_("length required when allocating a slice")); | |
7521 | return Expression::make_error(this->location()); | |
7522 | } | |
e67508fa | 7523 | len_arg = Expression::make_integer_ul(0, NULL, loc); |
a9182619 | 7524 | } |
7525 | else | |
7526 | { | |
7527 | len_arg = *parg; | |
f6bc81e6 | 7528 | len_arg->determine_type(&int_context); |
ccea2b36 | 7529 | if (!this->check_int_value(len_arg, true, &len_small)) |
1ad00fd4 | 7530 | return Expression::make_error(this->location()); |
a9182619 | 7531 | ++parg; |
7532 | } | |
7533 | ||
7534 | Expression* cap_arg = NULL; | |
ccea2b36 | 7535 | bool cap_small = false; |
a9182619 | 7536 | if (is_slice && parg != args->end()) |
7537 | { | |
7538 | cap_arg = *parg; | |
f6bc81e6 | 7539 | cap_arg->determine_type(&int_context); |
ccea2b36 | 7540 | if (!this->check_int_value(cap_arg, false, &cap_small)) |
1ad00fd4 | 7541 | return Expression::make_error(this->location()); |
7542 | ||
7543 | Numeric_constant nclen; | |
7544 | Numeric_constant nccap; | |
7545 | unsigned long vlen; | |
7546 | unsigned long vcap; | |
7547 | if (len_arg->numeric_constant_value(&nclen) | |
7548 | && cap_arg->numeric_constant_value(&nccap) | |
7549 | && nclen.to_unsigned_long(&vlen) == Numeric_constant::NC_UL_VALID | |
7550 | && nccap.to_unsigned_long(&vcap) == Numeric_constant::NC_UL_VALID | |
7551 | && vlen > vcap) | |
a9182619 | 7552 | { |
1ad00fd4 | 7553 | this->report_error(_("len larger than cap")); |
a9182619 | 7554 | return Expression::make_error(this->location()); |
7555 | } | |
1ad00fd4 | 7556 | |
a9182619 | 7557 | ++parg; |
7558 | } | |
7559 | ||
7560 | if (parg != args->end()) | |
7561 | { | |
7562 | this->report_error(_("too many arguments to make")); | |
7563 | return Expression::make_error(this->location()); | |
7564 | } | |
7565 | ||
b13c66cd | 7566 | Location type_loc = first_arg->location(); |
a9182619 | 7567 | |
7568 | Expression* call; | |
7569 | if (is_slice) | |
7570 | { | |
321e5ad2 | 7571 | Type* et = type->array_type()->element_type(); |
7572 | Expression* type_arg = Expression::make_type_descriptor(et, type_loc); | |
a9182619 | 7573 | if (cap_arg == NULL) |
321e5ad2 | 7574 | { |
7575 | Temporary_statement* temp = Statement::make_temporary(NULL, | |
7576 | len_arg, | |
7577 | loc); | |
7578 | inserter->insert(temp); | |
7579 | len_arg = Expression::make_temporary_reference(temp, loc); | |
7580 | cap_arg = Expression::make_temporary_reference(temp, loc); | |
ccea2b36 | 7581 | cap_small = len_small; |
321e5ad2 | 7582 | } |
ccea2b36 | 7583 | |
7584 | Runtime::Function code = Runtime::MAKESLICE; | |
7585 | if (!len_small || !cap_small) | |
7586 | code = Runtime::MAKESLICE64; | |
7587 | call = Runtime::make_call(code, loc, 3, type_arg, len_arg, cap_arg); | |
a9182619 | 7588 | } |
7589 | else if (is_map) | |
321e5ad2 | 7590 | { |
7591 | Expression* type_arg = Expression::make_type_descriptor(type, type_loc); | |
7592 | call = Runtime::make_call(Runtime::MAKEMAP, loc, 4, type_arg, len_arg, | |
7593 | Expression::make_nil(loc), | |
7594 | Expression::make_nil(loc)); | |
7595 | } | |
a9182619 | 7596 | else if (is_chan) |
321e5ad2 | 7597 | { |
7598 | Expression* type_arg = Expression::make_type_descriptor(type, type_loc); | |
7599 | call = Runtime::make_call(Runtime::MAKECHAN, loc, 2, type_arg, len_arg); | |
7600 | } | |
a9182619 | 7601 | else |
7602 | go_unreachable(); | |
7603 | ||
7604 | return Expression::make_unsafe_cast(type, call, loc); | |
7605 | } | |
7606 | ||
321e5ad2 | 7607 | // Flatten a call to the predeclared append function. We do this in |
7608 | // the flatten phase, not the lowering phase, so that we run after | |
7609 | // type checking and after order_evaluations. | |
7610 | ||
7611 | Expression* | |
7612 | Builtin_call_expression::flatten_append(Gogo* gogo, Named_object* function, | |
7613 | Statement_inserter* inserter) | |
7614 | { | |
7615 | if (this->is_error_expression()) | |
7616 | return this; | |
7617 | ||
7618 | Location loc = this->location(); | |
7619 | ||
7620 | const Expression_list* args = this->args(); | |
7621 | go_assert(args != NULL && !args->empty()); | |
7622 | ||
7623 | Type* slice_type = args->front()->type(); | |
7624 | go_assert(slice_type->is_slice_type()); | |
7625 | Type* element_type = slice_type->array_type()->element_type(); | |
7626 | ||
7627 | if (args->size() == 1) | |
7628 | { | |
7629 | // append(s) evaluates to s. | |
7630 | return args->front(); | |
7631 | } | |
7632 | ||
7633 | Type* int_type = Type::lookup_integer_type("int"); | |
7634 | Type* uint_type = Type::lookup_integer_type("uint"); | |
7635 | ||
7636 | // Implementing | |
7637 | // append(s1, s2...) | |
7638 | // or | |
7639 | // append(s1, a1, a2, a3, ...) | |
7640 | ||
7641 | // s1tmp := s1 | |
7642 | Temporary_statement* s1tmp = Statement::make_temporary(NULL, args->front(), | |
7643 | loc); | |
7644 | inserter->insert(s1tmp); | |
7645 | ||
7646 | // l1tmp := len(s1tmp) | |
7647 | Named_object* lenfn = gogo->lookup_global("len"); | |
7648 | Expression* lenref = Expression::make_func_reference(lenfn, NULL, loc); | |
7649 | Expression_list* call_args = new Expression_list(); | |
7650 | call_args->push_back(Expression::make_temporary_reference(s1tmp, loc)); | |
7651 | Expression* len = Expression::make_call(lenref, call_args, false, loc); | |
7652 | gogo->lower_expression(function, inserter, &len); | |
7653 | gogo->flatten_expression(function, inserter, &len); | |
7654 | Temporary_statement* l1tmp = Statement::make_temporary(int_type, len, loc); | |
7655 | inserter->insert(l1tmp); | |
7656 | ||
7657 | Temporary_statement* s2tmp = NULL; | |
7658 | Temporary_statement* l2tmp = NULL; | |
7659 | Expression_list* add = NULL; | |
7660 | Expression* len2; | |
7661 | if (this->is_varargs()) | |
7662 | { | |
7663 | go_assert(args->size() == 2); | |
7664 | ||
7665 | // s2tmp := s2 | |
7666 | s2tmp = Statement::make_temporary(NULL, args->back(), loc); | |
7667 | inserter->insert(s2tmp); | |
7668 | ||
7669 | // l2tmp := len(s2tmp) | |
7670 | lenref = Expression::make_func_reference(lenfn, NULL, loc); | |
7671 | call_args = new Expression_list(); | |
7672 | call_args->push_back(Expression::make_temporary_reference(s2tmp, loc)); | |
7673 | len = Expression::make_call(lenref, call_args, false, loc); | |
7674 | gogo->lower_expression(function, inserter, &len); | |
7675 | gogo->flatten_expression(function, inserter, &len); | |
7676 | l2tmp = Statement::make_temporary(int_type, len, loc); | |
7677 | inserter->insert(l2tmp); | |
7678 | ||
7679 | // len2 = l2tmp | |
7680 | len2 = Expression::make_temporary_reference(l2tmp, loc); | |
7681 | } | |
7682 | else | |
7683 | { | |
7684 | // We have to ensure that all the arguments are in variables | |
7685 | // now, because otherwise if one of them is an index expression | |
7686 | // into the current slice we could overwrite it before we fetch | |
7687 | // it. | |
7688 | add = new Expression_list(); | |
7689 | Expression_list::const_iterator pa = args->begin(); | |
7690 | for (++pa; pa != args->end(); ++pa) | |
7691 | { | |
7692 | if ((*pa)->is_variable()) | |
7693 | add->push_back(*pa); | |
7694 | else | |
7695 | { | |
7696 | Temporary_statement* tmp = Statement::make_temporary(NULL, *pa, | |
7697 | loc); | |
7698 | inserter->insert(tmp); | |
7699 | add->push_back(Expression::make_temporary_reference(tmp, loc)); | |
7700 | } | |
7701 | } | |
7702 | ||
7703 | // len2 = len(add) | |
7704 | len2 = Expression::make_integer_ul(add->size(), int_type, loc); | |
7705 | } | |
7706 | ||
7707 | // ntmp := l1tmp + len2 | |
7708 | Expression* ref = Expression::make_temporary_reference(l1tmp, loc); | |
7709 | Expression* sum = Expression::make_binary(OPERATOR_PLUS, ref, len2, loc); | |
7710 | gogo->lower_expression(function, inserter, &sum); | |
7711 | gogo->flatten_expression(function, inserter, &sum); | |
7712 | Temporary_statement* ntmp = Statement::make_temporary(int_type, sum, loc); | |
7713 | inserter->insert(ntmp); | |
7714 | ||
7715 | // s1tmp = uint(ntmp) > uint(cap(s1tmp)) ? | |
7716 | // growslice(type, s1tmp, ntmp) : | |
7717 | // s1tmp[:ntmp] | |
7718 | // Using uint here means that if the computation of ntmp overflowed, | |
7719 | // we will call growslice which will panic. | |
7720 | ||
7721 | Expression* left = Expression::make_temporary_reference(ntmp, loc); | |
7722 | left = Expression::make_cast(uint_type, left, loc); | |
7723 | ||
7724 | Named_object* capfn = gogo->lookup_global("cap"); | |
7725 | Expression* capref = Expression::make_func_reference(capfn, NULL, loc); | |
7726 | call_args = new Expression_list(); | |
7727 | call_args->push_back(Expression::make_temporary_reference(s1tmp, loc)); | |
7728 | Expression* right = Expression::make_call(capref, call_args, false, loc); | |
7729 | right = Expression::make_cast(uint_type, right, loc); | |
7730 | ||
7731 | Expression* cond = Expression::make_binary(OPERATOR_GT, left, right, loc); | |
7732 | ||
7733 | Expression* a1 = Expression::make_type_descriptor(element_type, loc); | |
7734 | Expression* a2 = Expression::make_temporary_reference(s1tmp, loc); | |
7735 | Expression* a3 = Expression::make_temporary_reference(ntmp, loc); | |
7736 | Expression* call = Runtime::make_call(Runtime::GROWSLICE, loc, 3, | |
7737 | a1, a2, a3); | |
7738 | call = Expression::make_unsafe_cast(slice_type, call, loc); | |
7739 | ||
7740 | ref = Expression::make_temporary_reference(s1tmp, loc); | |
7741 | Expression* zero = Expression::make_integer_ul(0, int_type, loc); | |
7742 | Expression* ref2 = Expression::make_temporary_reference(ntmp, loc); | |
7743 | // FIXME: Mark this index as not requiring bounds checks. | |
7744 | ref = Expression::make_index(ref, zero, ref2, NULL, loc); | |
7745 | ||
7746 | Expression* rhs = Expression::make_conditional(cond, call, ref, loc); | |
7747 | ||
7748 | gogo->lower_expression(function, inserter, &rhs); | |
7749 | gogo->flatten_expression(function, inserter, &rhs); | |
7750 | ||
7751 | Expression* lhs = Expression::make_temporary_reference(s1tmp, loc); | |
7752 | Statement* assign = Statement::make_assignment(lhs, rhs, loc); | |
7753 | inserter->insert(assign); | |
7754 | ||
7755 | if (this->is_varargs()) | |
7756 | { | |
7757 | // copy(s1tmp[l1tmp:], s2tmp) | |
7758 | a1 = Expression::make_temporary_reference(s1tmp, loc); | |
7759 | ref = Expression::make_temporary_reference(l1tmp, loc); | |
7760 | Expression* nil = Expression::make_nil(loc); | |
7761 | // FIXME: Mark this index as not requiring bounds checks. | |
7762 | a1 = Expression::make_index(a1, ref, nil, NULL, loc); | |
7763 | ||
7764 | a2 = Expression::make_temporary_reference(s2tmp, loc); | |
7765 | ||
7766 | Named_object* copyfn = gogo->lookup_global("copy"); | |
7767 | Expression* copyref = Expression::make_func_reference(copyfn, NULL, loc); | |
7768 | call_args = new Expression_list(); | |
7769 | call_args->push_back(a1); | |
7770 | call_args->push_back(a2); | |
7771 | call = Expression::make_call(copyref, call_args, false, loc); | |
7772 | gogo->lower_expression(function, inserter, &call); | |
7773 | gogo->flatten_expression(function, inserter, &call); | |
7774 | inserter->insert(Statement::make_statement(call, false)); | |
7775 | } | |
7776 | else | |
7777 | { | |
7778 | // For each argument: | |
7779 | // s1tmp[l1tmp+i] = a | |
7780 | unsigned long i = 0; | |
7781 | for (Expression_list::const_iterator pa = add->begin(); | |
7782 | pa != add->end(); | |
7783 | ++pa, ++i) | |
7784 | { | |
7785 | ref = Expression::make_temporary_reference(s1tmp, loc); | |
7786 | ref2 = Expression::make_temporary_reference(l1tmp, loc); | |
7787 | Expression* off = Expression::make_integer_ul(i, int_type, loc); | |
7788 | ref2 = Expression::make_binary(OPERATOR_PLUS, ref2, off, loc); | |
7789 | // FIXME: Mark this index as not requiring bounds checks. | |
7790 | lhs = Expression::make_index(ref, ref2, NULL, NULL, loc); | |
7791 | gogo->lower_expression(function, inserter, &lhs); | |
7792 | gogo->flatten_expression(function, inserter, &lhs); | |
03118c21 | 7793 | // The flatten pass runs after the write barrier pass, so we |
7794 | // need to insert a write barrier here if necessary. | |
7795 | if (!gogo->assign_needs_write_barrier(lhs)) | |
7796 | assign = Statement::make_assignment(lhs, *pa, loc); | |
7797 | else | |
7798 | { | |
7799 | Function* f = function == NULL ? NULL : function->func_value(); | |
7800 | assign = gogo->assign_with_write_barrier(f, NULL, inserter, | |
7801 | lhs, *pa, loc); | |
7802 | } | |
321e5ad2 | 7803 | inserter->insert(assign); |
7804 | } | |
7805 | } | |
7806 | ||
7807 | return Expression::make_temporary_reference(s1tmp, loc); | |
7808 | } | |
7809 | ||
a9182619 | 7810 | // Return whether an expression has an integer value. Report an error |
7811 | // if not. This is used when handling calls to the predeclared make | |
ccea2b36 | 7812 | // function. Set *SMALL if the value is known to fit in type "int". |
a9182619 | 7813 | |
7814 | bool | |
ccea2b36 | 7815 | Builtin_call_expression::check_int_value(Expression* e, bool is_length, |
7816 | bool *small) | |
a9182619 | 7817 | { |
ccea2b36 | 7818 | *small = false; |
7819 | ||
0c77715b | 7820 | Numeric_constant nc; |
1ad00fd4 | 7821 | if (e->numeric_constant_value(&nc)) |
a9182619 | 7822 | { |
1ad00fd4 | 7823 | unsigned long v; |
7824 | switch (nc.to_unsigned_long(&v)) | |
7825 | { | |
7826 | case Numeric_constant::NC_UL_VALID: | |
1b10c5e7 | 7827 | break; |
1ad00fd4 | 7828 | case Numeric_constant::NC_UL_NOTINT: |
631d5788 | 7829 | go_error_at(e->location(), "non-integer %s argument to make", |
7830 | is_length ? "len" : "cap"); | |
1ad00fd4 | 7831 | return false; |
7832 | case Numeric_constant::NC_UL_NEGATIVE: | |
631d5788 | 7833 | go_error_at(e->location(), "negative %s argument to make", |
7834 | is_length ? "len" : "cap"); | |
1ad00fd4 | 7835 | return false; |
7836 | case Numeric_constant::NC_UL_BIG: | |
7837 | // We don't want to give a compile-time error for a 64-bit | |
7838 | // value on a 32-bit target. | |
1b10c5e7 | 7839 | break; |
1ad00fd4 | 7840 | } |
1b10c5e7 | 7841 | |
7842 | mpz_t val; | |
7843 | if (!nc.to_int(&val)) | |
7844 | go_unreachable(); | |
7845 | int bits = mpz_sizeinbase(val, 2); | |
7846 | mpz_clear(val); | |
7847 | Type* int_type = Type::lookup_integer_type("int"); | |
7848 | if (bits >= int_type->integer_type()->bits()) | |
7849 | { | |
631d5788 | 7850 | go_error_at(e->location(), "%s argument too large for make", |
7851 | is_length ? "len" : "cap"); | |
1b10c5e7 | 7852 | return false; |
7853 | } | |
7854 | ||
ccea2b36 | 7855 | *small = true; |
1b10c5e7 | 7856 | return true; |
a9182619 | 7857 | } |
7858 | ||
1ad00fd4 | 7859 | if (e->type()->integer_type() != NULL) |
ccea2b36 | 7860 | { |
7861 | int ebits = e->type()->integer_type()->bits(); | |
7862 | int intbits = Type::lookup_integer_type("int")->integer_type()->bits(); | |
7863 | ||
7864 | // We can treat ebits == intbits as small even for an unsigned | |
7865 | // integer type, because we will convert the value to int and | |
7866 | // then reject it in the runtime if it is negative. | |
7867 | *small = ebits <= intbits; | |
7868 | ||
7869 | return true; | |
7870 | } | |
1ad00fd4 | 7871 | |
631d5788 | 7872 | go_error_at(e->location(), "non-integer %s argument to make", |
7873 | is_length ? "len" : "cap"); | |
a9182619 | 7874 | return false; |
7875 | } | |
7876 | ||
e440a328 | 7877 | // Return the type of the real or imag functions, given the type of |
fcbea5e4 | 7878 | // the argument. We need to map complex64 to float32 and complex128 |
7879 | // to float64, so it has to be done by name. This returns NULL if it | |
7880 | // can't figure out the type. | |
e440a328 | 7881 | |
7882 | Type* | |
7883 | Builtin_call_expression::real_imag_type(Type* arg_type) | |
7884 | { | |
7885 | if (arg_type == NULL || arg_type->is_abstract()) | |
7886 | return NULL; | |
7887 | Named_type* nt = arg_type->named_type(); | |
7888 | if (nt == NULL) | |
7889 | return NULL; | |
7890 | while (nt->real_type()->named_type() != NULL) | |
7891 | nt = nt->real_type()->named_type(); | |
48080209 | 7892 | if (nt->name() == "complex64") |
e440a328 | 7893 | return Type::lookup_float_type("float32"); |
7894 | else if (nt->name() == "complex128") | |
7895 | return Type::lookup_float_type("float64"); | |
7896 | else | |
7897 | return NULL; | |
7898 | } | |
7899 | ||
48080209 | 7900 | // Return the type of the complex function, given the type of one of the |
e440a328 | 7901 | // argments. Like real_imag_type, we have to map by name. |
7902 | ||
7903 | Type* | |
48080209 | 7904 | Builtin_call_expression::complex_type(Type* arg_type) |
e440a328 | 7905 | { |
7906 | if (arg_type == NULL || arg_type->is_abstract()) | |
7907 | return NULL; | |
7908 | Named_type* nt = arg_type->named_type(); | |
7909 | if (nt == NULL) | |
7910 | return NULL; | |
7911 | while (nt->real_type()->named_type() != NULL) | |
7912 | nt = nt->real_type()->named_type(); | |
48080209 | 7913 | if (nt->name() == "float32") |
e440a328 | 7914 | return Type::lookup_complex_type("complex64"); |
7915 | else if (nt->name() == "float64") | |
7916 | return Type::lookup_complex_type("complex128"); | |
7917 | else | |
7918 | return NULL; | |
7919 | } | |
7920 | ||
7921 | // Return a single argument, or NULL if there isn't one. | |
7922 | ||
7923 | Expression* | |
7924 | Builtin_call_expression::one_arg() const | |
7925 | { | |
7926 | const Expression_list* args = this->args(); | |
aa615cb3 | 7927 | if (args == NULL || args->size() != 1) |
e440a328 | 7928 | return NULL; |
7929 | return args->front(); | |
7930 | } | |
7931 | ||
83921647 | 7932 | // A traversal class which looks for a call or receive expression. |
7933 | ||
7934 | class Find_call_expression : public Traverse | |
7935 | { | |
7936 | public: | |
7937 | Find_call_expression() | |
7938 | : Traverse(traverse_expressions), | |
7939 | found_(false) | |
7940 | { } | |
7941 | ||
7942 | int | |
7943 | expression(Expression**); | |
7944 | ||
7945 | bool | |
7946 | found() | |
7947 | { return this->found_; } | |
7948 | ||
7949 | private: | |
7950 | bool found_; | |
7951 | }; | |
7952 | ||
7953 | int | |
7954 | Find_call_expression::expression(Expression** pexpr) | |
7955 | { | |
7956 | if ((*pexpr)->call_expression() != NULL | |
7957 | || (*pexpr)->receive_expression() != NULL) | |
7958 | { | |
7959 | this->found_ = true; | |
7960 | return TRAVERSE_EXIT; | |
7961 | } | |
7962 | return TRAVERSE_CONTINUE; | |
7963 | } | |
7964 | ||
7965 | // Return whether this is constant: len of a string constant, or len | |
7966 | // or cap of an array, or unsafe.Sizeof, unsafe.Offsetof, | |
7967 | // unsafe.Alignof. | |
e440a328 | 7968 | |
7969 | bool | |
7970 | Builtin_call_expression::do_is_constant() const | |
7971 | { | |
12e69faa | 7972 | if (this->is_error_expression()) |
7973 | return true; | |
e440a328 | 7974 | switch (this->code_) |
7975 | { | |
7976 | case BUILTIN_LEN: | |
7977 | case BUILTIN_CAP: | |
7978 | { | |
0f914071 | 7979 | if (this->seen_) |
7980 | return false; | |
7981 | ||
e440a328 | 7982 | Expression* arg = this->one_arg(); |
7983 | if (arg == NULL) | |
7984 | return false; | |
7985 | Type* arg_type = arg->type(); | |
7986 | ||
7987 | if (arg_type->points_to() != NULL | |
7988 | && arg_type->points_to()->array_type() != NULL | |
411eb89e | 7989 | && !arg_type->points_to()->is_slice_type()) |
e440a328 | 7990 | arg_type = arg_type->points_to(); |
7991 | ||
83921647 | 7992 | // The len and cap functions are only constant if there are no |
7993 | // function calls or channel operations in the arguments. | |
7994 | // Otherwise we have to make the call. | |
7995 | if (!arg->is_constant()) | |
7996 | { | |
7997 | Find_call_expression find_call; | |
7998 | Expression::traverse(&arg, &find_call); | |
7999 | if (find_call.found()) | |
8000 | return false; | |
8001 | } | |
8002 | ||
e440a328 | 8003 | if (arg_type->array_type() != NULL |
8004 | && arg_type->array_type()->length() != NULL) | |
0f914071 | 8005 | return true; |
e440a328 | 8006 | |
8007 | if (this->code_ == BUILTIN_LEN && arg_type->is_string_type()) | |
0f914071 | 8008 | { |
8009 | this->seen_ = true; | |
8010 | bool ret = arg->is_constant(); | |
8011 | this->seen_ = false; | |
8012 | return ret; | |
8013 | } | |
e440a328 | 8014 | } |
8015 | break; | |
8016 | ||
8017 | case BUILTIN_SIZEOF: | |
8018 | case BUILTIN_ALIGNOF: | |
8019 | return this->one_arg() != NULL; | |
8020 | ||
8021 | case BUILTIN_OFFSETOF: | |
8022 | { | |
8023 | Expression* arg = this->one_arg(); | |
8024 | if (arg == NULL) | |
8025 | return false; | |
8026 | return arg->field_reference_expression() != NULL; | |
8027 | } | |
8028 | ||
48080209 | 8029 | case BUILTIN_COMPLEX: |
e440a328 | 8030 | { |
8031 | const Expression_list* args = this->args(); | |
8032 | if (args != NULL && args->size() == 2) | |
8033 | return args->front()->is_constant() && args->back()->is_constant(); | |
8034 | } | |
8035 | break; | |
8036 | ||
8037 | case BUILTIN_REAL: | |
8038 | case BUILTIN_IMAG: | |
8039 | { | |
8040 | Expression* arg = this->one_arg(); | |
8041 | return arg != NULL && arg->is_constant(); | |
8042 | } | |
8043 | ||
8044 | default: | |
8045 | break; | |
8046 | } | |
8047 | ||
8048 | return false; | |
8049 | } | |
8050 | ||
0c77715b | 8051 | // Return a numeric constant if possible. |
e440a328 | 8052 | |
8053 | bool | |
0c77715b | 8054 | Builtin_call_expression::do_numeric_constant_value(Numeric_constant* nc) const |
e440a328 | 8055 | { |
8056 | if (this->code_ == BUILTIN_LEN | |
8057 | || this->code_ == BUILTIN_CAP) | |
8058 | { | |
8059 | Expression* arg = this->one_arg(); | |
8060 | if (arg == NULL) | |
8061 | return false; | |
8062 | Type* arg_type = arg->type(); | |
8063 | ||
8064 | if (this->code_ == BUILTIN_LEN && arg_type->is_string_type()) | |
8065 | { | |
8066 | std::string sval; | |
8067 | if (arg->string_constant_value(&sval)) | |
8068 | { | |
0c77715b | 8069 | nc->set_unsigned_long(Type::lookup_integer_type("int"), |
8070 | sval.length()); | |
e440a328 | 8071 | return true; |
8072 | } | |
8073 | } | |
8074 | ||
8075 | if (arg_type->points_to() != NULL | |
8076 | && arg_type->points_to()->array_type() != NULL | |
411eb89e | 8077 | && !arg_type->points_to()->is_slice_type()) |
e440a328 | 8078 | arg_type = arg_type->points_to(); |
8079 | ||
8080 | if (arg_type->array_type() != NULL | |
8081 | && arg_type->array_type()->length() != NULL) | |
8082 | { | |
0f914071 | 8083 | if (this->seen_) |
8084 | return false; | |
e440a328 | 8085 | Expression* e = arg_type->array_type()->length(); |
0f914071 | 8086 | this->seen_ = true; |
0c77715b | 8087 | bool r = e->numeric_constant_value(nc); |
0f914071 | 8088 | this->seen_ = false; |
8089 | if (r) | |
e440a328 | 8090 | { |
0c77715b | 8091 | if (!nc->set_type(Type::lookup_integer_type("int"), false, |
8092 | this->location())) | |
8093 | r = false; | |
e440a328 | 8094 | } |
0c77715b | 8095 | return r; |
e440a328 | 8096 | } |
8097 | } | |
8098 | else if (this->code_ == BUILTIN_SIZEOF | |
8099 | || this->code_ == BUILTIN_ALIGNOF) | |
8100 | { | |
8101 | Expression* arg = this->one_arg(); | |
8102 | if (arg == NULL) | |
8103 | return false; | |
8104 | Type* arg_type = arg->type(); | |
5c13bd80 | 8105 | if (arg_type->is_error()) |
e440a328 | 8106 | return false; |
8107 | if (arg_type->is_abstract()) | |
8108 | return false; | |
2c809f8f | 8109 | if (this->seen_) |
8110 | return false; | |
927a01eb | 8111 | |
3f378015 | 8112 | int64_t ret; |
e440a328 | 8113 | if (this->code_ == BUILTIN_SIZEOF) |
8114 | { | |
2c809f8f | 8115 | this->seen_ = true; |
8116 | bool ok = arg_type->backend_type_size(this->gogo_, &ret); | |
8117 | this->seen_ = false; | |
8118 | if (!ok) | |
e440a328 | 8119 | return false; |
8120 | } | |
8121 | else if (this->code_ == BUILTIN_ALIGNOF) | |
8122 | { | |
2c809f8f | 8123 | bool ok; |
8124 | this->seen_ = true; | |
637bd3af | 8125 | if (arg->field_reference_expression() == NULL) |
2c809f8f | 8126 | ok = arg_type->backend_type_align(this->gogo_, &ret); |
637bd3af | 8127 | else |
e440a328 | 8128 | { |
8129 | // Calling unsafe.Alignof(s.f) returns the alignment of | |
8130 | // the type of f when it is used as a field in a struct. | |
2c809f8f | 8131 | ok = arg_type->backend_type_field_align(this->gogo_, &ret); |
e440a328 | 8132 | } |
2c809f8f | 8133 | this->seen_ = false; |
8134 | if (!ok) | |
8135 | return false; | |
e440a328 | 8136 | } |
8137 | else | |
c3e6f413 | 8138 | go_unreachable(); |
927a01eb | 8139 | |
3f378015 | 8140 | mpz_t zval; |
8141 | set_mpz_from_int64(&zval, ret); | |
8142 | nc->set_int(Type::lookup_integer_type("uintptr"), zval); | |
8143 | mpz_clear(zval); | |
e440a328 | 8144 | return true; |
8145 | } | |
8146 | else if (this->code_ == BUILTIN_OFFSETOF) | |
8147 | { | |
8148 | Expression* arg = this->one_arg(); | |
8149 | if (arg == NULL) | |
8150 | return false; | |
8151 | Field_reference_expression* farg = arg->field_reference_expression(); | |
8152 | if (farg == NULL) | |
8153 | return false; | |
2c809f8f | 8154 | if (this->seen_) |
8155 | return false; | |
8156 | ||
3f378015 | 8157 | int64_t total_offset = 0; |
9a4bd570 | 8158 | while (true) |
8159 | { | |
8160 | Expression* struct_expr = farg->expr(); | |
8161 | Type* st = struct_expr->type(); | |
8162 | if (st->struct_type() == NULL) | |
8163 | return false; | |
8164 | if (st->named_type() != NULL) | |
8165 | st->named_type()->convert(this->gogo_); | |
3f378015 | 8166 | int64_t offset; |
2c809f8f | 8167 | this->seen_ = true; |
8168 | bool ok = st->struct_type()->backend_field_offset(this->gogo_, | |
8169 | farg->field_index(), | |
8170 | &offset); | |
8171 | this->seen_ = false; | |
8172 | if (!ok) | |
8173 | return false; | |
9a4bd570 | 8174 | total_offset += offset; |
8175 | if (farg->implicit() && struct_expr->field_reference_expression() != NULL) | |
8176 | { | |
8177 | // Go up until we reach the original base. | |
8178 | farg = struct_expr->field_reference_expression(); | |
8179 | continue; | |
8180 | } | |
8181 | break; | |
8182 | } | |
3f378015 | 8183 | mpz_t zval; |
8184 | set_mpz_from_int64(&zval, total_offset); | |
8185 | nc->set_int(Type::lookup_integer_type("uintptr"), zval); | |
8186 | mpz_clear(zval); | |
e440a328 | 8187 | return true; |
8188 | } | |
0c77715b | 8189 | else if (this->code_ == BUILTIN_REAL || this->code_ == BUILTIN_IMAG) |
e440a328 | 8190 | { |
8191 | Expression* arg = this->one_arg(); | |
8192 | if (arg == NULL) | |
8193 | return false; | |
8194 | ||
0c77715b | 8195 | Numeric_constant argnc; |
8196 | if (!arg->numeric_constant_value(&argnc)) | |
8197 | return false; | |
8198 | ||
fcbea5e4 | 8199 | mpc_t val; |
8200 | if (!argnc.to_complex(&val)) | |
0c77715b | 8201 | return false; |
e440a328 | 8202 | |
0c77715b | 8203 | Type* type = Builtin_call_expression::real_imag_type(argnc.type()); |
8204 | if (this->code_ == BUILTIN_REAL) | |
fcbea5e4 | 8205 | nc->set_float(type, mpc_realref(val)); |
0c77715b | 8206 | else |
fcbea5e4 | 8207 | nc->set_float(type, mpc_imagref(val)); |
8208 | mpc_clear(val); | |
0c77715b | 8209 | return true; |
e440a328 | 8210 | } |
0c77715b | 8211 | else if (this->code_ == BUILTIN_COMPLEX) |
e440a328 | 8212 | { |
8213 | const Expression_list* args = this->args(); | |
8214 | if (args == NULL || args->size() != 2) | |
8215 | return false; | |
8216 | ||
0c77715b | 8217 | Numeric_constant rnc; |
8218 | if (!args->front()->numeric_constant_value(&rnc)) | |
8219 | return false; | |
8220 | Numeric_constant inc; | |
8221 | if (!args->back()->numeric_constant_value(&inc)) | |
8222 | return false; | |
8223 | ||
8224 | if (rnc.type() != NULL | |
8225 | && !rnc.type()->is_abstract() | |
8226 | && inc.type() != NULL | |
8227 | && !inc.type()->is_abstract() | |
8228 | && !Type::are_identical(rnc.type(), inc.type(), false, NULL)) | |
8229 | return false; | |
8230 | ||
e440a328 | 8231 | mpfr_t r; |
0c77715b | 8232 | if (!rnc.to_float(&r)) |
8233 | return false; | |
8234 | mpfr_t i; | |
8235 | if (!inc.to_float(&i)) | |
e440a328 | 8236 | { |
8237 | mpfr_clear(r); | |
8238 | return false; | |
8239 | } | |
8240 | ||
0c77715b | 8241 | Type* arg_type = rnc.type(); |
8242 | if (arg_type == NULL || arg_type->is_abstract()) | |
8243 | arg_type = inc.type(); | |
e440a328 | 8244 | |
fcbea5e4 | 8245 | mpc_t val; |
8246 | mpc_init2(val, mpc_precision); | |
8247 | mpc_set_fr_fr(val, r, i, MPC_RNDNN); | |
e440a328 | 8248 | mpfr_clear(r); |
8249 | mpfr_clear(i); | |
8250 | ||
fcbea5e4 | 8251 | Type* type = Builtin_call_expression::complex_type(arg_type); |
8252 | nc->set_complex(type, val); | |
8253 | ||
8254 | mpc_clear(val); | |
8255 | ||
0c77715b | 8256 | return true; |
e440a328 | 8257 | } |
8258 | ||
8259 | return false; | |
8260 | } | |
8261 | ||
a7549a6a | 8262 | // Give an error if we are discarding the value of an expression which |
8263 | // should not normally be discarded. We don't give an error for | |
8264 | // discarding the value of an ordinary function call, but we do for | |
8265 | // builtin functions, purely for consistency with the gc compiler. | |
8266 | ||
4f2138d7 | 8267 | bool |
a7549a6a | 8268 | Builtin_call_expression::do_discarding_value() |
8269 | { | |
8270 | switch (this->code_) | |
8271 | { | |
8272 | case BUILTIN_INVALID: | |
8273 | default: | |
8274 | go_unreachable(); | |
8275 | ||
8276 | case BUILTIN_APPEND: | |
8277 | case BUILTIN_CAP: | |
8278 | case BUILTIN_COMPLEX: | |
8279 | case BUILTIN_IMAG: | |
8280 | case BUILTIN_LEN: | |
8281 | case BUILTIN_MAKE: | |
8282 | case BUILTIN_NEW: | |
8283 | case BUILTIN_REAL: | |
8284 | case BUILTIN_ALIGNOF: | |
8285 | case BUILTIN_OFFSETOF: | |
8286 | case BUILTIN_SIZEOF: | |
8287 | this->unused_value_error(); | |
4f2138d7 | 8288 | return false; |
a7549a6a | 8289 | |
8290 | case BUILTIN_CLOSE: | |
8291 | case BUILTIN_COPY: | |
1cce762f | 8292 | case BUILTIN_DELETE: |
a7549a6a | 8293 | case BUILTIN_PANIC: |
8294 | case BUILTIN_PRINT: | |
8295 | case BUILTIN_PRINTLN: | |
8296 | case BUILTIN_RECOVER: | |
4f2138d7 | 8297 | return true; |
a7549a6a | 8298 | } |
8299 | } | |
8300 | ||
e440a328 | 8301 | // Return the type. |
8302 | ||
8303 | Type* | |
8304 | Builtin_call_expression::do_type() | |
8305 | { | |
79651b1f | 8306 | if (this->is_error_expression()) |
8307 | return Type::make_error_type(); | |
e440a328 | 8308 | switch (this->code_) |
8309 | { | |
8310 | case BUILTIN_INVALID: | |
8311 | default: | |
79651b1f | 8312 | return Type::make_error_type(); |
e440a328 | 8313 | |
8314 | case BUILTIN_NEW: | |
8315 | case BUILTIN_MAKE: | |
8316 | { | |
8317 | const Expression_list* args = this->args(); | |
8318 | if (args == NULL || args->empty()) | |
8319 | return Type::make_error_type(); | |
8320 | return Type::make_pointer_type(args->front()->type()); | |
8321 | } | |
8322 | ||
8323 | case BUILTIN_CAP: | |
8324 | case BUILTIN_COPY: | |
8325 | case BUILTIN_LEN: | |
7ba86326 | 8326 | return Type::lookup_integer_type("int"); |
8327 | ||
e440a328 | 8328 | case BUILTIN_ALIGNOF: |
8329 | case BUILTIN_OFFSETOF: | |
8330 | case BUILTIN_SIZEOF: | |
7ba86326 | 8331 | return Type::lookup_integer_type("uintptr"); |
e440a328 | 8332 | |
8333 | case BUILTIN_CLOSE: | |
1cce762f | 8334 | case BUILTIN_DELETE: |
e440a328 | 8335 | case BUILTIN_PANIC: |
8336 | case BUILTIN_PRINT: | |
8337 | case BUILTIN_PRINTLN: | |
8338 | return Type::make_void_type(); | |
8339 | ||
e440a328 | 8340 | case BUILTIN_RECOVER: |
823c7e3d | 8341 | return Type::make_empty_interface_type(Linemap::predeclared_location()); |
e440a328 | 8342 | |
8343 | case BUILTIN_APPEND: | |
8344 | { | |
8345 | const Expression_list* args = this->args(); | |
8346 | if (args == NULL || args->empty()) | |
8347 | return Type::make_error_type(); | |
3ff4863b | 8348 | Type *ret = args->front()->type(); |
8349 | if (!ret->is_slice_type()) | |
8350 | return Type::make_error_type(); | |
8351 | return ret; | |
e440a328 | 8352 | } |
8353 | ||
8354 | case BUILTIN_REAL: | |
8355 | case BUILTIN_IMAG: | |
8356 | { | |
8357 | Expression* arg = this->one_arg(); | |
8358 | if (arg == NULL) | |
8359 | return Type::make_error_type(); | |
8360 | Type* t = arg->type(); | |
8361 | if (t->is_abstract()) | |
8362 | t = t->make_non_abstract_type(); | |
8363 | t = Builtin_call_expression::real_imag_type(t); | |
8364 | if (t == NULL) | |
8365 | t = Type::make_error_type(); | |
8366 | return t; | |
8367 | } | |
8368 | ||
48080209 | 8369 | case BUILTIN_COMPLEX: |
e440a328 | 8370 | { |
8371 | const Expression_list* args = this->args(); | |
8372 | if (args == NULL || args->size() != 2) | |
8373 | return Type::make_error_type(); | |
8374 | Type* t = args->front()->type(); | |
8375 | if (t->is_abstract()) | |
8376 | { | |
8377 | t = args->back()->type(); | |
8378 | if (t->is_abstract()) | |
8379 | t = t->make_non_abstract_type(); | |
8380 | } | |
48080209 | 8381 | t = Builtin_call_expression::complex_type(t); |
e440a328 | 8382 | if (t == NULL) |
8383 | t = Type::make_error_type(); | |
8384 | return t; | |
8385 | } | |
8386 | } | |
8387 | } | |
8388 | ||
8389 | // Determine the type. | |
8390 | ||
8391 | void | |
8392 | Builtin_call_expression::do_determine_type(const Type_context* context) | |
8393 | { | |
fb94b0ca | 8394 | if (!this->determining_types()) |
8395 | return; | |
8396 | ||
e440a328 | 8397 | this->fn()->determine_type_no_context(); |
8398 | ||
8399 | const Expression_list* args = this->args(); | |
8400 | ||
8401 | bool is_print; | |
8402 | Type* arg_type = NULL; | |
321e5ad2 | 8403 | Type* trailing_arg_types = NULL; |
e440a328 | 8404 | switch (this->code_) |
8405 | { | |
8406 | case BUILTIN_PRINT: | |
8407 | case BUILTIN_PRINTLN: | |
8408 | // Do not force a large integer constant to "int". | |
8409 | is_print = true; | |
8410 | break; | |
8411 | ||
8412 | case BUILTIN_REAL: | |
8413 | case BUILTIN_IMAG: | |
48080209 | 8414 | arg_type = Builtin_call_expression::complex_type(context->type); |
f6bc81e6 | 8415 | if (arg_type == NULL) |
8416 | arg_type = Type::lookup_complex_type("complex128"); | |
e440a328 | 8417 | is_print = false; |
8418 | break; | |
8419 | ||
48080209 | 8420 | case BUILTIN_COMPLEX: |
e440a328 | 8421 | { |
48080209 | 8422 | // For the complex function the type of one operand can |
e440a328 | 8423 | // determine the type of the other, as in a binary expression. |
8424 | arg_type = Builtin_call_expression::real_imag_type(context->type); | |
f6bc81e6 | 8425 | if (arg_type == NULL) |
8426 | arg_type = Type::lookup_float_type("float64"); | |
e440a328 | 8427 | if (args != NULL && args->size() == 2) |
8428 | { | |
8429 | Type* t1 = args->front()->type(); | |
c849bb59 | 8430 | Type* t2 = args->back()->type(); |
e440a328 | 8431 | if (!t1->is_abstract()) |
8432 | arg_type = t1; | |
8433 | else if (!t2->is_abstract()) | |
8434 | arg_type = t2; | |
8435 | } | |
8436 | is_print = false; | |
8437 | } | |
8438 | break; | |
8439 | ||
321e5ad2 | 8440 | case BUILTIN_APPEND: |
8441 | if (!this->is_varargs() | |
8442 | && args != NULL | |
8443 | && !args->empty() | |
8444 | && args->front()->type()->is_slice_type()) | |
8445 | trailing_arg_types = | |
8446 | args->front()->type()->array_type()->element_type(); | |
8447 | is_print = false; | |
8448 | break; | |
8449 | ||
e440a328 | 8450 | default: |
8451 | is_print = false; | |
8452 | break; | |
8453 | } | |
8454 | ||
8455 | if (args != NULL) | |
8456 | { | |
8457 | for (Expression_list::const_iterator pa = args->begin(); | |
8458 | pa != args->end(); | |
8459 | ++pa) | |
8460 | { | |
8461 | Type_context subcontext; | |
8462 | subcontext.type = arg_type; | |
8463 | ||
8464 | if (is_print) | |
8465 | { | |
8466 | // We want to print large constants, we so can't just | |
8467 | // use the appropriate nonabstract type. Use uint64 for | |
8468 | // an integer if we know it is nonnegative, otherwise | |
8469 | // use int64 for a integer, otherwise use float64 for a | |
8470 | // float or complex128 for a complex. | |
8471 | Type* want_type = NULL; | |
8472 | Type* atype = (*pa)->type(); | |
8473 | if (atype->is_abstract()) | |
8474 | { | |
8475 | if (atype->integer_type() != NULL) | |
8476 | { | |
0c77715b | 8477 | Numeric_constant nc; |
8478 | if (this->numeric_constant_value(&nc)) | |
8479 | { | |
8480 | mpz_t val; | |
8481 | if (nc.to_int(&val)) | |
8482 | { | |
8483 | if (mpz_sgn(val) >= 0) | |
8484 | want_type = Type::lookup_integer_type("uint64"); | |
8485 | mpz_clear(val); | |
8486 | } | |
8487 | } | |
8488 | if (want_type == NULL) | |
e440a328 | 8489 | want_type = Type::lookup_integer_type("int64"); |
e440a328 | 8490 | } |
8491 | else if (atype->float_type() != NULL) | |
8492 | want_type = Type::lookup_float_type("float64"); | |
8493 | else if (atype->complex_type() != NULL) | |
8494 | want_type = Type::lookup_complex_type("complex128"); | |
8495 | else if (atype->is_abstract_string_type()) | |
8496 | want_type = Type::lookup_string_type(); | |
8497 | else if (atype->is_abstract_boolean_type()) | |
8498 | want_type = Type::lookup_bool_type(); | |
8499 | else | |
c3e6f413 | 8500 | go_unreachable(); |
e440a328 | 8501 | subcontext.type = want_type; |
8502 | } | |
8503 | } | |
8504 | ||
8505 | (*pa)->determine_type(&subcontext); | |
321e5ad2 | 8506 | |
8507 | if (trailing_arg_types != NULL) | |
8508 | { | |
8509 | arg_type = trailing_arg_types; | |
8510 | trailing_arg_types = NULL; | |
8511 | } | |
e440a328 | 8512 | } |
8513 | } | |
8514 | } | |
8515 | ||
8516 | // If there is exactly one argument, return true. Otherwise give an | |
8517 | // error message and return false. | |
8518 | ||
8519 | bool | |
8520 | Builtin_call_expression::check_one_arg() | |
8521 | { | |
8522 | const Expression_list* args = this->args(); | |
8523 | if (args == NULL || args->size() < 1) | |
8524 | { | |
8525 | this->report_error(_("not enough arguments")); | |
8526 | return false; | |
8527 | } | |
8528 | else if (args->size() > 1) | |
8529 | { | |
8530 | this->report_error(_("too many arguments")); | |
8531 | return false; | |
8532 | } | |
8533 | if (args->front()->is_error_expression() | |
5c13bd80 | 8534 | || args->front()->type()->is_error()) |
e440a328 | 8535 | { |
8536 | this->set_is_error(); | |
8537 | return false; | |
8538 | } | |
8539 | return true; | |
8540 | } | |
8541 | ||
8542 | // Check argument types for a builtin function. | |
8543 | ||
8544 | void | |
8545 | Builtin_call_expression::do_check_types(Gogo*) | |
8546 | { | |
375646ea | 8547 | if (this->is_error_expression()) |
8548 | return; | |
e440a328 | 8549 | switch (this->code_) |
8550 | { | |
8551 | case BUILTIN_INVALID: | |
8552 | case BUILTIN_NEW: | |
8553 | case BUILTIN_MAKE: | |
cd238b8d | 8554 | case BUILTIN_DELETE: |
e440a328 | 8555 | return; |
8556 | ||
8557 | case BUILTIN_LEN: | |
8558 | case BUILTIN_CAP: | |
8559 | { | |
8560 | // The single argument may be either a string or an array or a | |
8561 | // map or a channel, or a pointer to a closed array. | |
8562 | if (this->check_one_arg()) | |
8563 | { | |
8564 | Type* arg_type = this->one_arg()->type(); | |
8565 | if (arg_type->points_to() != NULL | |
8566 | && arg_type->points_to()->array_type() != NULL | |
411eb89e | 8567 | && !arg_type->points_to()->is_slice_type()) |
e440a328 | 8568 | arg_type = arg_type->points_to(); |
8569 | if (this->code_ == BUILTIN_CAP) | |
8570 | { | |
5c13bd80 | 8571 | if (!arg_type->is_error() |
e440a328 | 8572 | && arg_type->array_type() == NULL |
8573 | && arg_type->channel_type() == NULL) | |
8574 | this->report_error(_("argument must be array or slice " | |
8575 | "or channel")); | |
8576 | } | |
8577 | else | |
8578 | { | |
5c13bd80 | 8579 | if (!arg_type->is_error() |
e440a328 | 8580 | && !arg_type->is_string_type() |
8581 | && arg_type->array_type() == NULL | |
8582 | && arg_type->map_type() == NULL | |
8583 | && arg_type->channel_type() == NULL) | |
8584 | this->report_error(_("argument must be string or " | |
8585 | "array or slice or map or channel")); | |
8586 | } | |
8587 | } | |
8588 | } | |
8589 | break; | |
8590 | ||
8591 | case BUILTIN_PRINT: | |
8592 | case BUILTIN_PRINTLN: | |
8593 | { | |
8594 | const Expression_list* args = this->args(); | |
8595 | if (args == NULL) | |
8596 | { | |
8597 | if (this->code_ == BUILTIN_PRINT) | |
631d5788 | 8598 | go_warning_at(this->location(), 0, |
e440a328 | 8599 | "no arguments for builtin function %<%s%>", |
8600 | (this->code_ == BUILTIN_PRINT | |
8601 | ? "print" | |
8602 | : "println")); | |
8603 | } | |
8604 | else | |
8605 | { | |
8606 | for (Expression_list::const_iterator p = args->begin(); | |
8607 | p != args->end(); | |
8608 | ++p) | |
8609 | { | |
8610 | Type* type = (*p)->type(); | |
5c13bd80 | 8611 | if (type->is_error() |
e440a328 | 8612 | || type->is_string_type() |
8613 | || type->integer_type() != NULL | |
8614 | || type->float_type() != NULL | |
8615 | || type->complex_type() != NULL | |
8616 | || type->is_boolean_type() | |
8617 | || type->points_to() != NULL | |
8618 | || type->interface_type() != NULL | |
8619 | || type->channel_type() != NULL | |
8620 | || type->map_type() != NULL | |
8621 | || type->function_type() != NULL | |
411eb89e | 8622 | || type->is_slice_type()) |
e440a328 | 8623 | ; |
acf8e158 | 8624 | else if ((*p)->is_type_expression()) |
8625 | { | |
8626 | // If this is a type expression it's going to give | |
8627 | // an error anyhow, so we don't need one here. | |
8628 | } | |
e440a328 | 8629 | else |
8630 | this->report_error(_("unsupported argument type to " | |
8631 | "builtin function")); | |
8632 | } | |
8633 | } | |
8634 | } | |
8635 | break; | |
8636 | ||
8637 | case BUILTIN_CLOSE: | |
e440a328 | 8638 | if (this->check_one_arg()) |
8639 | { | |
8640 | if (this->one_arg()->type()->channel_type() == NULL) | |
8641 | this->report_error(_("argument must be channel")); | |
5202d986 | 8642 | else if (!this->one_arg()->type()->channel_type()->may_send()) |
8643 | this->report_error(_("cannot close receive-only channel")); | |
e440a328 | 8644 | } |
8645 | break; | |
8646 | ||
8647 | case BUILTIN_PANIC: | |
8648 | case BUILTIN_SIZEOF: | |
8649 | case BUILTIN_ALIGNOF: | |
8650 | this->check_one_arg(); | |
8651 | break; | |
8652 | ||
8653 | case BUILTIN_RECOVER: | |
6334270b | 8654 | if (this->args() != NULL |
8655 | && !this->args()->empty() | |
8656 | && !this->recover_arg_is_set_) | |
e440a328 | 8657 | this->report_error(_("too many arguments")); |
8658 | break; | |
8659 | ||
8660 | case BUILTIN_OFFSETOF: | |
8661 | if (this->check_one_arg()) | |
8662 | { | |
8663 | Expression* arg = this->one_arg(); | |
8664 | if (arg->field_reference_expression() == NULL) | |
8665 | this->report_error(_("argument must be a field reference")); | |
8666 | } | |
8667 | break; | |
8668 | ||
8669 | case BUILTIN_COPY: | |
8670 | { | |
8671 | const Expression_list* args = this->args(); | |
8672 | if (args == NULL || args->size() < 2) | |
8673 | { | |
8674 | this->report_error(_("not enough arguments")); | |
8675 | break; | |
8676 | } | |
8677 | else if (args->size() > 2) | |
8678 | { | |
8679 | this->report_error(_("too many arguments")); | |
8680 | break; | |
8681 | } | |
8682 | Type* arg1_type = args->front()->type(); | |
8683 | Type* arg2_type = args->back()->type(); | |
5c13bd80 | 8684 | if (arg1_type->is_error() || arg2_type->is_error()) |
6bebb39d | 8685 | { |
8686 | this->set_is_error(); | |
8687 | break; | |
8688 | } | |
e440a328 | 8689 | |
8690 | Type* e1; | |
411eb89e | 8691 | if (arg1_type->is_slice_type()) |
e440a328 | 8692 | e1 = arg1_type->array_type()->element_type(); |
8693 | else | |
8694 | { | |
8695 | this->report_error(_("left argument must be a slice")); | |
8696 | break; | |
8697 | } | |
8698 | ||
411eb89e | 8699 | if (arg2_type->is_slice_type()) |
60963afd | 8700 | { |
8701 | Type* e2 = arg2_type->array_type()->element_type(); | |
8702 | if (!Type::are_identical(e1, e2, true, NULL)) | |
8703 | this->report_error(_("element types must be the same")); | |
8704 | } | |
e440a328 | 8705 | else if (arg2_type->is_string_type()) |
e440a328 | 8706 | { |
60963afd | 8707 | if (e1->integer_type() == NULL || !e1->integer_type()->is_byte()) |
8708 | this->report_error(_("first argument must be []byte")); | |
e440a328 | 8709 | } |
60963afd | 8710 | else |
8711 | this->report_error(_("second argument must be slice or string")); | |
e440a328 | 8712 | } |
8713 | break; | |
8714 | ||
8715 | case BUILTIN_APPEND: | |
8716 | { | |
8717 | const Expression_list* args = this->args(); | |
321e5ad2 | 8718 | if (args == NULL || args->empty()) |
e440a328 | 8719 | { |
8720 | this->report_error(_("not enough arguments")); | |
8721 | break; | |
8722 | } | |
321e5ad2 | 8723 | |
8724 | Type* slice_type = args->front()->type(); | |
8725 | if (!slice_type->is_slice_type()) | |
6bebb39d | 8726 | { |
321e5ad2 | 8727 | if (slice_type->is_error_type()) |
8728 | break; | |
8729 | if (slice_type->is_nil_type()) | |
8730 | go_error_at(args->front()->location(), "use of untyped nil"); | |
8731 | else | |
8732 | go_error_at(args->front()->location(), | |
8733 | "argument 1 must be a slice"); | |
6bebb39d | 8734 | this->set_is_error(); |
8735 | break; | |
8736 | } | |
cd238b8d | 8737 | |
321e5ad2 | 8738 | Type* element_type = slice_type->array_type()->element_type(); |
8739 | if (this->is_varargs()) | |
4fd4fcf4 | 8740 | { |
321e5ad2 | 8741 | if (!args->back()->type()->is_slice_type() |
8742 | && !args->back()->type()->is_string_type()) | |
8743 | { | |
8744 | go_error_at(args->back()->location(), | |
8745 | "invalid use of %<...%> with non-slice/non-string"); | |
8746 | this->set_is_error(); | |
8747 | break; | |
8748 | } | |
4fd4fcf4 | 8749 | |
321e5ad2 | 8750 | if (args->size() < 2) |
8751 | { | |
8752 | this->report_error(_("not enough arguments")); | |
8753 | break; | |
8754 | } | |
8755 | if (args->size() > 2) | |
8756 | { | |
8757 | this->report_error(_("too many arguments")); | |
8758 | break; | |
8759 | } | |
8760 | ||
8761 | if (args->back()->type()->is_string_type() | |
8762 | && element_type->integer_type() != NULL | |
8763 | && element_type->integer_type()->is_byte()) | |
8764 | { | |
8765 | // Permit append(s1, s2...) when s1 is a slice of | |
8766 | // bytes and s2 is a string type. | |
8767 | } | |
e440a328 | 8768 | else |
8769 | { | |
321e5ad2 | 8770 | // We have to test for assignment compatibility to a |
8771 | // slice of the element type, which is not necessarily | |
8772 | // the same as the type of the first argument: the | |
8773 | // first argument might have a named type. | |
8774 | Type* check_type = Type::make_array_type(element_type, NULL); | |
8775 | std::string reason; | |
8776 | if (!Type::are_assignable(check_type, args->back()->type(), | |
8777 | &reason)) | |
8778 | { | |
8779 | if (reason.empty()) | |
8780 | go_error_at(args->back()->location(), | |
8781 | "argument 2 has invalid type"); | |
8782 | else | |
8783 | go_error_at(args->back()->location(), | |
8784 | "argument 2 has invalid type (%s)", | |
8785 | reason.c_str()); | |
8786 | this->set_is_error(); | |
8787 | break; | |
8788 | } | |
8789 | } | |
8790 | } | |
8791 | else | |
8792 | { | |
8793 | Expression_list::const_iterator pa = args->begin(); | |
8794 | int i = 2; | |
8795 | for (++pa; pa != args->end(); ++pa, ++i) | |
8796 | { | |
8797 | std::string reason; | |
8798 | if (!Type::are_assignable(element_type, (*pa)->type(), | |
8799 | &reason)) | |
8800 | { | |
8801 | if (reason.empty()) | |
8802 | go_error_at((*pa)->location(), | |
8803 | "argument %d has incompatible type", i); | |
8804 | else | |
8805 | go_error_at((*pa)->location(), | |
8806 | "argument %d has incompatible type (%s)", | |
8807 | i, reason.c_str()); | |
8808 | this->set_is_error(); | |
8809 | } | |
e440a328 | 8810 | } |
8811 | } | |
e440a328 | 8812 | } |
321e5ad2 | 8813 | break; |
e440a328 | 8814 | |
8815 | case BUILTIN_REAL: | |
8816 | case BUILTIN_IMAG: | |
8817 | if (this->check_one_arg()) | |
8818 | { | |
8819 | if (this->one_arg()->type()->complex_type() == NULL) | |
8820 | this->report_error(_("argument must have complex type")); | |
8821 | } | |
8822 | break; | |
8823 | ||
48080209 | 8824 | case BUILTIN_COMPLEX: |
e440a328 | 8825 | { |
8826 | const Expression_list* args = this->args(); | |
8827 | if (args == NULL || args->size() < 2) | |
8828 | this->report_error(_("not enough arguments")); | |
8829 | else if (args->size() > 2) | |
8830 | this->report_error(_("too many arguments")); | |
8831 | else if (args->front()->is_error_expression() | |
5c13bd80 | 8832 | || args->front()->type()->is_error() |
e440a328 | 8833 | || args->back()->is_error_expression() |
5c13bd80 | 8834 | || args->back()->type()->is_error()) |
e440a328 | 8835 | this->set_is_error(); |
8836 | else if (!Type::are_identical(args->front()->type(), | |
07ba8be5 | 8837 | args->back()->type(), true, NULL)) |
48080209 | 8838 | this->report_error(_("complex arguments must have identical types")); |
e440a328 | 8839 | else if (args->front()->type()->float_type() == NULL) |
48080209 | 8840 | this->report_error(_("complex arguments must have " |
e440a328 | 8841 | "floating-point type")); |
8842 | } | |
8843 | break; | |
8844 | ||
8845 | default: | |
c3e6f413 | 8846 | go_unreachable(); |
e440a328 | 8847 | } |
8848 | } | |
8849 | ||
72666aed | 8850 | Expression* |
8851 | Builtin_call_expression::do_copy() | |
8852 | { | |
8853 | Call_expression* bce = | |
8854 | new Builtin_call_expression(this->gogo_, this->fn()->copy(), | |
da244e59 | 8855 | (this->args() == NULL |
8856 | ? NULL | |
8857 | : this->args()->copy()), | |
72666aed | 8858 | this->is_varargs(), |
8859 | this->location()); | |
8860 | ||
8861 | if (this->varargs_are_lowered()) | |
8862 | bce->set_varargs_are_lowered(); | |
8863 | return bce; | |
8864 | } | |
8865 | ||
ea664253 | 8866 | // Return the backend representation for a builtin function. |
e440a328 | 8867 | |
ea664253 | 8868 | Bexpression* |
8869 | Builtin_call_expression::do_get_backend(Translate_context* context) | |
e440a328 | 8870 | { |
8871 | Gogo* gogo = context->gogo(); | |
b13c66cd | 8872 | Location location = this->location(); |
a0d8874e | 8873 | |
8874 | if (this->is_erroneous_call()) | |
8875 | { | |
8876 | go_assert(saw_errors()); | |
8877 | return gogo->backend()->error_expression(); | |
8878 | } | |
8879 | ||
e440a328 | 8880 | switch (this->code_) |
8881 | { | |
8882 | case BUILTIN_INVALID: | |
8883 | case BUILTIN_NEW: | |
8884 | case BUILTIN_MAKE: | |
c3e6f413 | 8885 | go_unreachable(); |
e440a328 | 8886 | |
8887 | case BUILTIN_LEN: | |
8888 | case BUILTIN_CAP: | |
8889 | { | |
8890 | const Expression_list* args = this->args(); | |
c484d925 | 8891 | go_assert(args != NULL && args->size() == 1); |
2c809f8f | 8892 | Expression* arg = args->front(); |
e440a328 | 8893 | Type* arg_type = arg->type(); |
0f914071 | 8894 | |
8895 | if (this->seen_) | |
8896 | { | |
c484d925 | 8897 | go_assert(saw_errors()); |
ea664253 | 8898 | return context->backend()->error_expression(); |
0f914071 | 8899 | } |
8900 | this->seen_ = true; | |
0f914071 | 8901 | this->seen_ = false; |
e440a328 | 8902 | if (arg_type->points_to() != NULL) |
8903 | { | |
8904 | arg_type = arg_type->points_to(); | |
c484d925 | 8905 | go_assert(arg_type->array_type() != NULL |
411eb89e | 8906 | && !arg_type->is_slice_type()); |
2c809f8f | 8907 | arg = Expression::make_unary(OPERATOR_MULT, arg, location); |
e440a328 | 8908 | } |
8909 | ||
1b1f2abf | 8910 | Type* int_type = Type::lookup_integer_type("int"); |
2c809f8f | 8911 | Expression* val; |
e440a328 | 8912 | if (this->code_ == BUILTIN_LEN) |
8913 | { | |
8914 | if (arg_type->is_string_type()) | |
2c809f8f | 8915 | val = Expression::make_string_info(arg, STRING_INFO_LENGTH, |
8916 | location); | |
e440a328 | 8917 | else if (arg_type->array_type() != NULL) |
0f914071 | 8918 | { |
8919 | if (this->seen_) | |
8920 | { | |
c484d925 | 8921 | go_assert(saw_errors()); |
ea664253 | 8922 | return context->backend()->error_expression(); |
0f914071 | 8923 | } |
8924 | this->seen_ = true; | |
2c809f8f | 8925 | val = arg_type->array_type()->get_length(gogo, arg); |
0f914071 | 8926 | this->seen_ = false; |
8927 | } | |
0d5530d9 | 8928 | else if (arg_type->map_type() != NULL |
8929 | || arg_type->channel_type() != NULL) | |
8930 | { | |
8931 | // The first field is the length. If the pointer is | |
8932 | // nil, the length is zero. | |
8933 | Type* pint_type = Type::make_pointer_type(int_type); | |
8934 | arg = Expression::make_unsafe_cast(pint_type, arg, location); | |
8935 | Expression* nil = Expression::make_nil(location); | |
8936 | nil = Expression::make_cast(pint_type, nil, location); | |
8937 | Expression* cmp = Expression::make_binary(OPERATOR_EQEQ, | |
8938 | arg, nil, location); | |
8939 | Expression* zero = Expression::make_integer_ul(0, int_type, | |
8940 | location); | |
8941 | Expression* indir = Expression::make_unary(OPERATOR_MULT, | |
8942 | arg, location); | |
8943 | val = Expression::make_conditional(cmp, zero, indir, location); | |
8944 | } | |
e440a328 | 8945 | else |
c3e6f413 | 8946 | go_unreachable(); |
e440a328 | 8947 | } |
8948 | else | |
8949 | { | |
8950 | if (arg_type->array_type() != NULL) | |
0f914071 | 8951 | { |
8952 | if (this->seen_) | |
8953 | { | |
c484d925 | 8954 | go_assert(saw_errors()); |
ea664253 | 8955 | return context->backend()->error_expression(); |
0f914071 | 8956 | } |
8957 | this->seen_ = true; | |
2c809f8f | 8958 | val = arg_type->array_type()->get_capacity(gogo, arg); |
0f914071 | 8959 | this->seen_ = false; |
8960 | } | |
e440a328 | 8961 | else if (arg_type->channel_type() != NULL) |
132ed071 | 8962 | { |
8963 | // The second field is the capacity. If the pointer | |
8964 | // is nil, the capacity is zero. | |
8965 | Type* uintptr_type = Type::lookup_integer_type("uintptr"); | |
8966 | Type* pint_type = Type::make_pointer_type(int_type); | |
8967 | Expression* parg = Expression::make_unsafe_cast(uintptr_type, | |
8968 | arg, | |
8969 | location); | |
8970 | int off = int_type->integer_type()->bits() / 8; | |
8971 | Expression* eoff = Expression::make_integer_ul(off, | |
8972 | uintptr_type, | |
8973 | location); | |
8974 | parg = Expression::make_binary(OPERATOR_PLUS, parg, eoff, | |
8975 | location); | |
8976 | parg = Expression::make_unsafe_cast(pint_type, parg, location); | |
8977 | Expression* nil = Expression::make_nil(location); | |
8978 | nil = Expression::make_cast(pint_type, nil, location); | |
8979 | Expression* cmp = Expression::make_binary(OPERATOR_EQEQ, | |
8980 | arg, nil, location); | |
8981 | Expression* zero = Expression::make_integer_ul(0, int_type, | |
8982 | location); | |
8983 | Expression* indir = Expression::make_unary(OPERATOR_MULT, | |
8984 | parg, location); | |
8985 | val = Expression::make_conditional(cmp, zero, indir, location); | |
8986 | } | |
e440a328 | 8987 | else |
c3e6f413 | 8988 | go_unreachable(); |
e440a328 | 8989 | } |
8990 | ||
2c809f8f | 8991 | return Expression::make_cast(int_type, val, |
ea664253 | 8992 | location)->get_backend(context); |
e440a328 | 8993 | } |
8994 | ||
8995 | case BUILTIN_PRINT: | |
8996 | case BUILTIN_PRINTLN: | |
8997 | { | |
8998 | const bool is_ln = this->code_ == BUILTIN_PRINTLN; | |
88b03a70 | 8999 | |
9000 | Expression* print_stmts = Runtime::make_call(Runtime::PRINTLOCK, | |
9001 | location, 0); | |
e440a328 | 9002 | |
9003 | const Expression_list* call_args = this->args(); | |
9004 | if (call_args != NULL) | |
9005 | { | |
9006 | for (Expression_list::const_iterator p = call_args->begin(); | |
9007 | p != call_args->end(); | |
9008 | ++p) | |
9009 | { | |
9010 | if (is_ln && p != call_args->begin()) | |
9011 | { | |
2c809f8f | 9012 | Expression* print_space = |
88b03a70 | 9013 | Runtime::make_call(Runtime::PRINTSP, location, 0); |
e440a328 | 9014 | |
2c809f8f | 9015 | print_stmts = |
9016 | Expression::make_compound(print_stmts, print_space, | |
9017 | location); | |
9018 | } | |
e440a328 | 9019 | |
2c809f8f | 9020 | Expression* arg = *p; |
9021 | Type* type = arg->type(); | |
9022 | Runtime::Function code; | |
e440a328 | 9023 | if (type->is_string_type()) |
88b03a70 | 9024 | code = Runtime::PRINTSTRING; |
e440a328 | 9025 | else if (type->integer_type() != NULL |
9026 | && type->integer_type()->is_unsigned()) | |
9027 | { | |
e440a328 | 9028 | Type* itype = Type::lookup_integer_type("uint64"); |
2c809f8f | 9029 | arg = Expression::make_cast(itype, arg, location); |
88b03a70 | 9030 | code = Runtime::PRINTUINT; |
e440a328 | 9031 | } |
9032 | else if (type->integer_type() != NULL) | |
9033 | { | |
e440a328 | 9034 | Type* itype = Type::lookup_integer_type("int64"); |
2c809f8f | 9035 | arg = Expression::make_cast(itype, arg, location); |
88b03a70 | 9036 | code = Runtime::PRINTINT; |
e440a328 | 9037 | } |
9038 | else if (type->float_type() != NULL) | |
9039 | { | |
2c809f8f | 9040 | Type* dtype = Type::lookup_float_type("float64"); |
9041 | arg = Expression::make_cast(dtype, arg, location); | |
88b03a70 | 9042 | code = Runtime::PRINTFLOAT; |
e440a328 | 9043 | } |
9044 | else if (type->complex_type() != NULL) | |
9045 | { | |
2c809f8f | 9046 | Type* ctype = Type::lookup_complex_type("complex128"); |
9047 | arg = Expression::make_cast(ctype, arg, location); | |
88b03a70 | 9048 | code = Runtime::PRINTCOMPLEX; |
e440a328 | 9049 | } |
9050 | else if (type->is_boolean_type()) | |
88b03a70 | 9051 | code = Runtime::PRINTBOOL; |
e440a328 | 9052 | else if (type->points_to() != NULL |
9053 | || type->channel_type() != NULL | |
9054 | || type->map_type() != NULL | |
9055 | || type->function_type() != NULL) | |
9056 | { | |
2c809f8f | 9057 | arg = Expression::make_cast(type, arg, location); |
88b03a70 | 9058 | code = Runtime::PRINTPOINTER; |
e440a328 | 9059 | } |
9060 | else if (type->interface_type() != NULL) | |
9061 | { | |
9062 | if (type->interface_type()->is_empty()) | |
88b03a70 | 9063 | code = Runtime::PRINTEFACE; |
e440a328 | 9064 | else |
88b03a70 | 9065 | code = Runtime::PRINTIFACE; |
e440a328 | 9066 | } |
411eb89e | 9067 | else if (type->is_slice_type()) |
88b03a70 | 9068 | code = Runtime::PRINTSLICE; |
e440a328 | 9069 | else |
cd238b8d | 9070 | { |
9071 | go_assert(saw_errors()); | |
ea664253 | 9072 | return context->backend()->error_expression(); |
cd238b8d | 9073 | } |
e440a328 | 9074 | |
2c809f8f | 9075 | Expression* call = Runtime::make_call(code, location, 1, arg); |
88b03a70 | 9076 | print_stmts = Expression::make_compound(print_stmts, call, |
9077 | location); | |
e440a328 | 9078 | } |
9079 | } | |
9080 | ||
9081 | if (is_ln) | |
9082 | { | |
2c809f8f | 9083 | Expression* print_nl = |
88b03a70 | 9084 | Runtime::make_call(Runtime::PRINTNL, location, 0); |
9085 | print_stmts = Expression::make_compound(print_stmts, print_nl, | |
9086 | location); | |
e440a328 | 9087 | } |
9088 | ||
88b03a70 | 9089 | Expression* unlock = Runtime::make_call(Runtime::PRINTUNLOCK, |
9090 | location, 0); | |
9091 | print_stmts = Expression::make_compound(print_stmts, unlock, location); | |
32e3ff69 | 9092 | |
ea664253 | 9093 | return print_stmts->get_backend(context); |
e440a328 | 9094 | } |
9095 | ||
9096 | case BUILTIN_PANIC: | |
9097 | { | |
9098 | const Expression_list* args = this->args(); | |
c484d925 | 9099 | go_assert(args != NULL && args->size() == 1); |
e440a328 | 9100 | Expression* arg = args->front(); |
b13c66cd | 9101 | Type *empty = |
823c7e3d | 9102 | Type::make_empty_interface_type(Linemap::predeclared_location()); |
2c809f8f | 9103 | arg = Expression::convert_for_assignment(gogo, empty, arg, location); |
9104 | ||
9105 | Expression* panic = | |
03ac9de4 | 9106 | Runtime::make_call(Runtime::GOPANIC, location, 1, arg); |
ea664253 | 9107 | return panic->get_backend(context); |
e440a328 | 9108 | } |
9109 | ||
9110 | case BUILTIN_RECOVER: | |
9111 | { | |
9112 | // The argument is set when building recover thunks. It's a | |
9113 | // boolean value which is true if we can recover a value now. | |
9114 | const Expression_list* args = this->args(); | |
c484d925 | 9115 | go_assert(args != NULL && args->size() == 1); |
e440a328 | 9116 | Expression* arg = args->front(); |
b13c66cd | 9117 | Type *empty = |
823c7e3d | 9118 | Type::make_empty_interface_type(Linemap::predeclared_location()); |
e440a328 | 9119 | |
e440a328 | 9120 | Expression* nil = Expression::make_nil(location); |
2c809f8f | 9121 | nil = Expression::convert_for_assignment(gogo, empty, nil, location); |
e440a328 | 9122 | |
9123 | // We need to handle a deferred call to recover specially, | |
9124 | // because it changes whether it can recover a panic or not. | |
9125 | // See test7 in test/recover1.go. | |
2c809f8f | 9126 | Expression* recover = Runtime::make_call((this->is_deferred() |
03ac9de4 | 9127 | ? Runtime::DEFERREDRECOVER |
9128 | : Runtime::GORECOVER), | |
2c809f8f | 9129 | location, 0); |
9130 | Expression* cond = | |
9131 | Expression::make_conditional(arg, recover, nil, location); | |
ea664253 | 9132 | return cond->get_backend(context); |
e440a328 | 9133 | } |
9134 | ||
9135 | case BUILTIN_CLOSE: | |
e440a328 | 9136 | { |
9137 | const Expression_list* args = this->args(); | |
c484d925 | 9138 | go_assert(args != NULL && args->size() == 1); |
e440a328 | 9139 | Expression* arg = args->front(); |
2c809f8f | 9140 | Expression* close = Runtime::make_call(Runtime::CLOSE, location, |
9141 | 1, arg); | |
ea664253 | 9142 | return close->get_backend(context); |
e440a328 | 9143 | } |
9144 | ||
9145 | case BUILTIN_SIZEOF: | |
9146 | case BUILTIN_OFFSETOF: | |
9147 | case BUILTIN_ALIGNOF: | |
9148 | { | |
0c77715b | 9149 | Numeric_constant nc; |
9150 | unsigned long val; | |
9151 | if (!this->numeric_constant_value(&nc) | |
9152 | || nc.to_unsigned_long(&val) != Numeric_constant::NC_UL_VALID) | |
7f1d9abd | 9153 | { |
c484d925 | 9154 | go_assert(saw_errors()); |
ea664253 | 9155 | return context->backend()->error_expression(); |
7f1d9abd | 9156 | } |
7ba86326 | 9157 | Type* uintptr_type = Type::lookup_integer_type("uintptr"); |
2c809f8f | 9158 | mpz_t ival; |
9159 | nc.get_int(&ival); | |
9160 | Expression* int_cst = | |
e67508fa | 9161 | Expression::make_integer_z(&ival, uintptr_type, location); |
2c809f8f | 9162 | mpz_clear(ival); |
ea664253 | 9163 | return int_cst->get_backend(context); |
e440a328 | 9164 | } |
9165 | ||
9166 | case BUILTIN_COPY: | |
9167 | { | |
9168 | const Expression_list* args = this->args(); | |
c484d925 | 9169 | go_assert(args != NULL && args->size() == 2); |
e440a328 | 9170 | Expression* arg1 = args->front(); |
9171 | Expression* arg2 = args->back(); | |
9172 | ||
e440a328 | 9173 | Type* arg1_type = arg1->type(); |
9174 | Array_type* at = arg1_type->array_type(); | |
35a54f17 | 9175 | go_assert(arg1->is_variable()); |
321e5ad2 | 9176 | |
9177 | Expression* call; | |
e440a328 | 9178 | |
9179 | Type* arg2_type = arg2->type(); | |
2c809f8f | 9180 | go_assert(arg2->is_variable()); |
321e5ad2 | 9181 | if (arg2_type->is_string_type()) |
9182 | call = Runtime::make_call(Runtime::SLICESTRINGCOPY, location, | |
9183 | 2, arg1, arg2); | |
e440a328 | 9184 | else |
9185 | { | |
321e5ad2 | 9186 | Type* et = at->element_type(); |
9187 | if (et->has_pointer()) | |
9188 | { | |
9189 | Expression* td = Expression::make_type_descriptor(et, | |
9190 | location); | |
9191 | call = Runtime::make_call(Runtime::TYPEDSLICECOPY, location, | |
9192 | 3, td, arg1, arg2); | |
9193 | } | |
9194 | else | |
9195 | { | |
9196 | Expression* sz = Expression::make_type_info(et, | |
9197 | TYPE_INFO_SIZE); | |
9198 | call = Runtime::make_call(Runtime::SLICECOPY, location, 3, | |
9199 | arg1, arg2, sz); | |
9200 | } | |
e440a328 | 9201 | } |
2c809f8f | 9202 | |
321e5ad2 | 9203 | return call->get_backend(context); |
e440a328 | 9204 | } |
9205 | ||
9206 | case BUILTIN_APPEND: | |
321e5ad2 | 9207 | // Handled in Builtin_call_expression::flatten_append. |
9208 | go_unreachable(); | |
e440a328 | 9209 | |
9210 | case BUILTIN_REAL: | |
9211 | case BUILTIN_IMAG: | |
9212 | { | |
9213 | const Expression_list* args = this->args(); | |
c484d925 | 9214 | go_assert(args != NULL && args->size() == 1); |
2c809f8f | 9215 | |
9216 | Bexpression* ret; | |
ea664253 | 9217 | Bexpression* bcomplex = args->front()->get_backend(context); |
2c809f8f | 9218 | if (this->code_ == BUILTIN_REAL) |
9219 | ret = gogo->backend()->real_part_expression(bcomplex, location); | |
9220 | else | |
9221 | ret = gogo->backend()->imag_part_expression(bcomplex, location); | |
ea664253 | 9222 | return ret; |
e440a328 | 9223 | } |
9224 | ||
48080209 | 9225 | case BUILTIN_COMPLEX: |
e440a328 | 9226 | { |
9227 | const Expression_list* args = this->args(); | |
c484d925 | 9228 | go_assert(args != NULL && args->size() == 2); |
ea664253 | 9229 | Bexpression* breal = args->front()->get_backend(context); |
9230 | Bexpression* bimag = args->back()->get_backend(context); | |
9231 | return gogo->backend()->complex_expression(breal, bimag, location); | |
e440a328 | 9232 | } |
9233 | ||
9234 | default: | |
c3e6f413 | 9235 | go_unreachable(); |
e440a328 | 9236 | } |
9237 | } | |
9238 | ||
9239 | // We have to support exporting a builtin call expression, because | |
9240 | // code can set a constant to the result of a builtin expression. | |
9241 | ||
9242 | void | |
9243 | Builtin_call_expression::do_export(Export* exp) const | |
9244 | { | |
0c77715b | 9245 | Numeric_constant nc; |
9246 | if (!this->numeric_constant_value(&nc)) | |
9247 | { | |
631d5788 | 9248 | go_error_at(this->location(), "value is not constant"); |
0c77715b | 9249 | return; |
9250 | } | |
e440a328 | 9251 | |
0c77715b | 9252 | if (nc.is_int()) |
e440a328 | 9253 | { |
0c77715b | 9254 | mpz_t val; |
9255 | nc.get_int(&val); | |
e440a328 | 9256 | Integer_expression::export_integer(exp, val); |
0c77715b | 9257 | mpz_clear(val); |
e440a328 | 9258 | } |
0c77715b | 9259 | else if (nc.is_float()) |
e440a328 | 9260 | { |
9261 | mpfr_t fval; | |
0c77715b | 9262 | nc.get_float(&fval); |
9263 | Float_expression::export_float(exp, fval); | |
e440a328 | 9264 | mpfr_clear(fval); |
9265 | } | |
0c77715b | 9266 | else if (nc.is_complex()) |
e440a328 | 9267 | { |
fcbea5e4 | 9268 | mpc_t cval; |
9269 | nc.get_complex(&cval); | |
9270 | Complex_expression::export_complex(exp, cval); | |
9271 | mpc_clear(cval); | |
e440a328 | 9272 | } |
0c77715b | 9273 | else |
9274 | go_unreachable(); | |
e440a328 | 9275 | |
9276 | // A trailing space lets us reliably identify the end of the number. | |
9277 | exp->write_c_string(" "); | |
9278 | } | |
9279 | ||
9280 | // Class Call_expression. | |
9281 | ||
8381eda7 | 9282 | // A Go function can be viewed in a couple of different ways. The |
9283 | // code of a Go function becomes a backend function with parameters | |
9284 | // whose types are simply the backend representation of the Go types. | |
9285 | // If there are multiple results, they are returned as a backend | |
9286 | // struct. | |
9287 | ||
9288 | // However, when Go code refers to a function other than simply | |
9289 | // calling it, the backend type of that function is actually a struct. | |
9290 | // The first field of the struct points to the Go function code | |
9291 | // (sometimes a wrapper as described below). The remaining fields | |
9292 | // hold addresses of closed-over variables. This struct is called a | |
9293 | // closure. | |
9294 | ||
9295 | // There are a few cases to consider. | |
9296 | ||
9297 | // A direct function call of a known function in package scope. In | |
9298 | // this case there are no closed-over variables, and we know the name | |
9299 | // of the function code. We can simply produce a backend call to the | |
9300 | // function directly, and not worry about the closure. | |
9301 | ||
9302 | // A direct function call of a known function literal. In this case | |
9303 | // we know the function code and we know the closure. We generate the | |
9304 | // function code such that it expects an additional final argument of | |
9305 | // the closure type. We pass the closure as the last argument, after | |
9306 | // the other arguments. | |
9307 | ||
9308 | // An indirect function call. In this case we have a closure. We | |
9309 | // load the pointer to the function code from the first field of the | |
9310 | // closure. We pass the address of the closure as the last argument. | |
9311 | ||
9312 | // A call to a method of an interface. Type methods are always at | |
9313 | // package scope, so we call the function directly, and don't worry | |
9314 | // about the closure. | |
9315 | ||
9316 | // This means that for a function at package scope we have two cases. | |
9317 | // One is the direct call, which has no closure. The other is the | |
9318 | // indirect call, which does have a closure. We can't simply ignore | |
9319 | // the closure, even though it is the last argument, because that will | |
9320 | // fail on targets where the function pops its arguments. So when | |
9321 | // generating a closure for a package-scope function we set the | |
9322 | // function code pointer in the closure to point to a wrapper | |
9323 | // function. This wrapper function accepts a final argument that | |
9324 | // points to the closure, ignores it, and calls the real function as a | |
9325 | // direct function call. This wrapper will normally be efficient, and | |
9326 | // can often simply be a tail call to the real function. | |
9327 | ||
9328 | // We don't use GCC's static chain pointer because 1) we don't need | |
9329 | // it; 2) GCC only permits using a static chain to call a known | |
9330 | // function, so we can't use it for an indirect call anyhow. Since we | |
9331 | // can't use it for an indirect call, we may as well not worry about | |
9332 | // using it for a direct call either. | |
9333 | ||
9334 | // We pass the closure last rather than first because it means that | |
9335 | // the function wrapper we put into a closure for a package-scope | |
9336 | // function can normally just be a tail call to the real function. | |
9337 | ||
9338 | // For method expressions we generate a wrapper that loads the | |
9339 | // receiver from the closure and then calls the method. This | |
9340 | // unfortunately forces reshuffling the arguments, since there is a | |
9341 | // new first argument, but we can't avoid reshuffling either for | |
9342 | // method expressions or for indirect calls of package-scope | |
9343 | // functions, and since the latter are more common we reshuffle for | |
9344 | // method expressions. | |
9345 | ||
9346 | // Note that the Go code retains the Go types. The extra final | |
9347 | // argument only appears when we convert to the backend | |
9348 | // representation. | |
9349 | ||
e440a328 | 9350 | // Traversal. |
9351 | ||
9352 | int | |
9353 | Call_expression::do_traverse(Traverse* traverse) | |
9354 | { | |
0c0dacab | 9355 | // If we are calling a function in a different package that returns |
9356 | // an unnamed type, this may be the only chance we get to traverse | |
9357 | // that type. We don't traverse this->type_ because it may be a | |
9358 | // Call_multiple_result_type that will just lead back here. | |
9359 | if (this->type_ != NULL && !this->type_->is_error_type()) | |
9360 | { | |
9361 | Function_type *fntype = this->get_function_type(); | |
9362 | if (fntype != NULL && Type::traverse(fntype, traverse) == TRAVERSE_EXIT) | |
9363 | return TRAVERSE_EXIT; | |
9364 | } | |
e440a328 | 9365 | if (Expression::traverse(&this->fn_, traverse) == TRAVERSE_EXIT) |
9366 | return TRAVERSE_EXIT; | |
9367 | if (this->args_ != NULL) | |
9368 | { | |
9369 | if (this->args_->traverse(traverse) == TRAVERSE_EXIT) | |
9370 | return TRAVERSE_EXIT; | |
9371 | } | |
9372 | return TRAVERSE_CONTINUE; | |
9373 | } | |
9374 | ||
9375 | // Lower a call statement. | |
9376 | ||
9377 | Expression* | |
ceeb4318 | 9378 | Call_expression::do_lower(Gogo* gogo, Named_object* function, |
9379 | Statement_inserter* inserter, int) | |
e440a328 | 9380 | { |
b13c66cd | 9381 | Location loc = this->location(); |
09ea332d | 9382 | |
ceeb4318 | 9383 | // A type cast can look like a function call. |
e440a328 | 9384 | if (this->fn_->is_type_expression() |
9385 | && this->args_ != NULL | |
9386 | && this->args_->size() == 1) | |
9387 | return Expression::make_cast(this->fn_->type(), this->args_->front(), | |
09ea332d | 9388 | loc); |
e440a328 | 9389 | |
88f06749 | 9390 | // Because do_type will return an error type and thus prevent future |
9391 | // errors, check for that case now to ensure that the error gets | |
9392 | // reported. | |
37448b10 | 9393 | Function_type* fntype = this->get_function_type(); |
9394 | if (fntype == NULL) | |
88f06749 | 9395 | { |
9396 | if (!this->fn_->type()->is_error()) | |
9397 | this->report_error(_("expected function")); | |
5f1045b5 | 9398 | this->set_is_error(); |
9399 | return this; | |
88f06749 | 9400 | } |
9401 | ||
e440a328 | 9402 | // Handle an argument which is a call to a function which returns |
9403 | // multiple results. | |
9404 | if (this->args_ != NULL | |
9405 | && this->args_->size() == 1 | |
37448b10 | 9406 | && this->args_->front()->call_expression() != NULL) |
e440a328 | 9407 | { |
e440a328 | 9408 | size_t rc = this->args_->front()->call_expression()->result_count(); |
9409 | if (rc > 1 | |
37448b10 | 9410 | && ((fntype->parameters() != NULL |
9411 | && (fntype->parameters()->size() == rc | |
9412 | || (fntype->is_varargs() | |
9413 | && fntype->parameters()->size() - 1 <= rc))) | |
9414 | || fntype->is_builtin())) | |
e440a328 | 9415 | { |
9416 | Call_expression* call = this->args_->front()->call_expression(); | |
e90ecd2d | 9417 | call->set_is_multi_value_arg(); |
c33af8e4 | 9418 | if (this->is_varargs_) |
9419 | { | |
9420 | // It is not clear which result of a multiple result call | |
9421 | // the ellipsis operator should be applied to. If we unpack the | |
9422 | // the call into its individual results here, the ellipsis will be | |
9423 | // applied to the last result. | |
631d5788 | 9424 | go_error_at(call->location(), |
9425 | _("multiple-value argument in single-value context")); | |
c33af8e4 | 9426 | return Expression::make_error(call->location()); |
9427 | } | |
9428 | ||
e440a328 | 9429 | Expression_list* args = new Expression_list; |
9430 | for (size_t i = 0; i < rc; ++i) | |
9431 | args->push_back(Expression::make_call_result(call, i)); | |
9432 | // We can't return a new call expression here, because this | |
42535814 | 9433 | // one may be referenced by Call_result expressions. We |
9434 | // also can't delete the old arguments, because we may still | |
9435 | // traverse them somewhere up the call stack. FIXME. | |
e440a328 | 9436 | this->args_ = args; |
9437 | } | |
9438 | } | |
9439 | ||
37448b10 | 9440 | // Recognize a call to a builtin function. |
9441 | if (fntype->is_builtin()) | |
9442 | return new Builtin_call_expression(gogo, this->fn_, this->args_, | |
9443 | this->is_varargs_, loc); | |
9444 | ||
ceeb4318 | 9445 | // If this call returns multiple results, create a temporary |
9446 | // variable for each result. | |
9447 | size_t rc = this->result_count(); | |
9448 | if (rc > 1 && this->results_ == NULL) | |
9449 | { | |
9450 | std::vector<Temporary_statement*>* temps = | |
9451 | new std::vector<Temporary_statement*>; | |
9452 | temps->reserve(rc); | |
37448b10 | 9453 | const Typed_identifier_list* results = fntype->results(); |
ceeb4318 | 9454 | for (Typed_identifier_list::const_iterator p = results->begin(); |
9455 | p != results->end(); | |
9456 | ++p) | |
9457 | { | |
9458 | Temporary_statement* temp = Statement::make_temporary(p->type(), | |
09ea332d | 9459 | NULL, loc); |
ceeb4318 | 9460 | inserter->insert(temp); |
9461 | temps->push_back(temp); | |
9462 | } | |
9463 | this->results_ = temps; | |
9464 | } | |
9465 | ||
e440a328 | 9466 | // Handle a call to a varargs function by packaging up the extra |
9467 | // parameters. | |
37448b10 | 9468 | if (fntype->is_varargs()) |
e440a328 | 9469 | { |
e440a328 | 9470 | const Typed_identifier_list* parameters = fntype->parameters(); |
c484d925 | 9471 | go_assert(parameters != NULL && !parameters->empty()); |
e440a328 | 9472 | Type* varargs_type = parameters->back().type(); |
09ea332d | 9473 | this->lower_varargs(gogo, function, inserter, varargs_type, |
0e9a2e72 | 9474 | parameters->size(), SLICE_STORAGE_MAY_ESCAPE); |
09ea332d | 9475 | } |
9476 | ||
9477 | // If this is call to a method, call the method directly passing the | |
9478 | // object as the first parameter. | |
9479 | Bound_method_expression* bme = this->fn_->bound_method_expression(); | |
9480 | if (bme != NULL) | |
9481 | { | |
0afbb937 | 9482 | Named_object* methodfn = bme->function(); |
09ea332d | 9483 | Expression* first_arg = bme->first_argument(); |
9484 | ||
9485 | // We always pass a pointer when calling a method. | |
9486 | if (first_arg->type()->points_to() == NULL | |
9487 | && !first_arg->type()->is_error()) | |
9488 | { | |
9489 | first_arg = Expression::make_unary(OPERATOR_AND, first_arg, loc); | |
9490 | // We may need to create a temporary variable so that we can | |
9491 | // take the address. We can't do that here because it will | |
9492 | // mess up the order of evaluation. | |
9493 | Unary_expression* ue = static_cast<Unary_expression*>(first_arg); | |
9494 | ue->set_create_temp(); | |
9495 | } | |
9496 | ||
9497 | // If we are calling a method which was inherited from an | |
9498 | // embedded struct, and the method did not get a stub, then the | |
9499 | // first type may be wrong. | |
9500 | Type* fatype = bme->first_argument_type(); | |
9501 | if (fatype != NULL) | |
9502 | { | |
9503 | if (fatype->points_to() == NULL) | |
9504 | fatype = Type::make_pointer_type(fatype); | |
9505 | first_arg = Expression::make_unsafe_cast(fatype, first_arg, loc); | |
9506 | } | |
9507 | ||
9508 | Expression_list* new_args = new Expression_list(); | |
9509 | new_args->push_back(first_arg); | |
9510 | if (this->args_ != NULL) | |
9511 | { | |
9512 | for (Expression_list::const_iterator p = this->args_->begin(); | |
9513 | p != this->args_->end(); | |
9514 | ++p) | |
9515 | new_args->push_back(*p); | |
9516 | } | |
9517 | ||
9518 | // We have to change in place because this structure may be | |
9519 | // referenced by Call_result_expressions. We can't delete the | |
9520 | // old arguments, because we may be traversing them up in some | |
9521 | // caller. FIXME. | |
9522 | this->args_ = new_args; | |
0afbb937 | 9523 | this->fn_ = Expression::make_func_reference(methodfn, NULL, |
09ea332d | 9524 | bme->location()); |
e440a328 | 9525 | } |
9526 | ||
105f9a24 | 9527 | // Handle a couple of special runtime functions. In the runtime |
9528 | // package, getcallerpc returns the PC of the caller, and | |
9529 | // getcallersp returns the frame pointer of the caller. Implement | |
9530 | // these by turning them into calls to GCC builtin functions. We | |
9531 | // could implement them in normal code, but then we would have to | |
9532 | // explicitly unwind the stack. These functions are intended to be | |
9533 | // efficient. Note that this technique obviously only works for | |
9534 | // direct calls, but that is the only way they are used. The actual | |
9535 | // argument to these functions is always the address of a parameter; | |
9536 | // we don't need that for the GCC builtin functions, so we just | |
9537 | // ignore it. | |
9538 | if (gogo->compiling_runtime() | |
9539 | && this->args_ != NULL | |
9540 | && this->args_->size() == 1 | |
9541 | && gogo->package_name() == "runtime") | |
9542 | { | |
9543 | Func_expression* fe = this->fn_->func_expression(); | |
9544 | if (fe != NULL | |
9545 | && fe->named_object()->is_function_declaration() | |
9546 | && fe->named_object()->package() == NULL) | |
9547 | { | |
9548 | std::string n = Gogo::unpack_hidden_name(fe->named_object()->name()); | |
9549 | if (n == "getcallerpc") | |
9550 | { | |
9551 | static Named_object* builtin_return_address; | |
9552 | return this->lower_to_builtin(&builtin_return_address, | |
9553 | "__builtin_return_address", | |
9554 | 0); | |
9555 | } | |
9556 | else if (n == "getcallersp") | |
9557 | { | |
9558 | static Named_object* builtin_frame_address; | |
9559 | return this->lower_to_builtin(&builtin_frame_address, | |
9560 | "__builtin_frame_address", | |
9561 | 1); | |
9562 | } | |
9563 | } | |
9564 | } | |
9565 | ||
e440a328 | 9566 | return this; |
9567 | } | |
9568 | ||
9569 | // Lower a call to a varargs function. FUNCTION is the function in | |
9570 | // which the call occurs--it's not the function we are calling. | |
9571 | // VARARGS_TYPE is the type of the varargs parameter, a slice type. | |
9572 | // PARAM_COUNT is the number of parameters of the function we are | |
9573 | // calling; the last of these parameters will be the varargs | |
9574 | // parameter. | |
9575 | ||
09ea332d | 9576 | void |
e440a328 | 9577 | Call_expression::lower_varargs(Gogo* gogo, Named_object* function, |
ceeb4318 | 9578 | Statement_inserter* inserter, |
0e9a2e72 | 9579 | Type* varargs_type, size_t param_count, |
9580 | Slice_storage_escape_disp escape_disp) | |
e440a328 | 9581 | { |
03118c21 | 9582 | // When compiling the runtime, varargs slices do not escape. When |
9583 | // escape analysis becomes the default, this should be changed to | |
9584 | // make it an error if we have a varargs slice that escapes. | |
9585 | if (gogo->compiling_runtime() && gogo->package_name() == "runtime") | |
9586 | escape_disp = SLICE_STORAGE_DOES_NOT_ESCAPE; | |
9587 | ||
e440a328 | 9588 | if (this->varargs_are_lowered_) |
09ea332d | 9589 | return; |
e440a328 | 9590 | |
b13c66cd | 9591 | Location loc = this->location(); |
e440a328 | 9592 | |
c484d925 | 9593 | go_assert(param_count > 0); |
411eb89e | 9594 | go_assert(varargs_type->is_slice_type()); |
e440a328 | 9595 | |
9596 | size_t arg_count = this->args_ == NULL ? 0 : this->args_->size(); | |
9597 | if (arg_count < param_count - 1) | |
9598 | { | |
9599 | // Not enough arguments; will be caught in check_types. | |
09ea332d | 9600 | return; |
e440a328 | 9601 | } |
9602 | ||
9603 | Expression_list* old_args = this->args_; | |
9604 | Expression_list* new_args = new Expression_list(); | |
9605 | bool push_empty_arg = false; | |
9606 | if (old_args == NULL || old_args->empty()) | |
9607 | { | |
c484d925 | 9608 | go_assert(param_count == 1); |
e440a328 | 9609 | push_empty_arg = true; |
9610 | } | |
9611 | else | |
9612 | { | |
9613 | Expression_list::const_iterator pa; | |
9614 | int i = 1; | |
9615 | for (pa = old_args->begin(); pa != old_args->end(); ++pa, ++i) | |
9616 | { | |
9617 | if (static_cast<size_t>(i) == param_count) | |
9618 | break; | |
9619 | new_args->push_back(*pa); | |
9620 | } | |
9621 | ||
9622 | // We have reached the varargs parameter. | |
9623 | ||
9624 | bool issued_error = false; | |
9625 | if (pa == old_args->end()) | |
9626 | push_empty_arg = true; | |
9627 | else if (pa + 1 == old_args->end() && this->is_varargs_) | |
9628 | new_args->push_back(*pa); | |
9629 | else if (this->is_varargs_) | |
9630 | { | |
a6645f74 | 9631 | if ((*pa)->type()->is_slice_type()) |
9632 | this->report_error(_("too many arguments")); | |
9633 | else | |
9634 | { | |
631d5788 | 9635 | go_error_at(this->location(), |
9636 | _("invalid use of %<...%> with non-slice")); | |
a6645f74 | 9637 | this->set_is_error(); |
9638 | } | |
09ea332d | 9639 | return; |
e440a328 | 9640 | } |
e440a328 | 9641 | else |
9642 | { | |
9643 | Type* element_type = varargs_type->array_type()->element_type(); | |
9644 | Expression_list* vals = new Expression_list; | |
9645 | for (; pa != old_args->end(); ++pa, ++i) | |
9646 | { | |
9647 | // Check types here so that we get a better message. | |
9648 | Type* patype = (*pa)->type(); | |
b13c66cd | 9649 | Location paloc = (*pa)->location(); |
e440a328 | 9650 | if (!this->check_argument_type(i, element_type, patype, |
9651 | paloc, issued_error)) | |
9652 | continue; | |
9653 | vals->push_back(*pa); | |
9654 | } | |
0e9a2e72 | 9655 | Slice_construction_expression* sce = |
e440a328 | 9656 | Expression::make_slice_composite_literal(varargs_type, vals, loc); |
0e9a2e72 | 9657 | if (escape_disp == SLICE_STORAGE_DOES_NOT_ESCAPE) |
9658 | sce->set_storage_does_not_escape(); | |
9659 | Expression* val = sce; | |
09ea332d | 9660 | gogo->lower_expression(function, inserter, &val); |
e440a328 | 9661 | new_args->push_back(val); |
9662 | } | |
9663 | } | |
9664 | ||
9665 | if (push_empty_arg) | |
9666 | new_args->push_back(Expression::make_nil(loc)); | |
9667 | ||
9668 | // We can't return a new call expression here, because this one may | |
6d4c2432 | 9669 | // be referenced by Call_result expressions. FIXME. We can't |
9670 | // delete OLD_ARGS because we may have both a Call_expression and a | |
9671 | // Builtin_call_expression which refer to them. FIXME. | |
e440a328 | 9672 | this->args_ = new_args; |
9673 | this->varargs_are_lowered_ = true; | |
e440a328 | 9674 | } |
9675 | ||
105f9a24 | 9676 | // Return a call to __builtin_return_address or __builtin_frame_address. |
9677 | ||
9678 | Expression* | |
9679 | Call_expression::lower_to_builtin(Named_object** pno, const char* name, | |
9680 | int arg) | |
9681 | { | |
9682 | if (*pno == NULL) | |
9683 | *pno = Gogo::declare_builtin_rf_address(name); | |
9684 | ||
9685 | Location loc = this->location(); | |
9686 | ||
9687 | Expression* fn = Expression::make_func_reference(*pno, NULL, loc); | |
9688 | Expression* a = Expression::make_integer_ul(arg, NULL, loc); | |
9689 | Expression_list *args = new Expression_list(); | |
9690 | args->push_back(a); | |
9691 | Expression* call = Expression::make_call(fn, args, false, loc); | |
9692 | ||
9693 | // The builtin functions return void*, but the Go functions return uintptr. | |
9694 | Type* uintptr_type = Type::lookup_integer_type("uintptr"); | |
9695 | return Expression::make_cast(uintptr_type, call, loc); | |
9696 | } | |
9697 | ||
2c809f8f | 9698 | // Flatten a call with multiple results into a temporary. |
9699 | ||
9700 | Expression* | |
b8e86a51 | 9701 | Call_expression::do_flatten(Gogo* gogo, Named_object*, |
9702 | Statement_inserter* inserter) | |
2c809f8f | 9703 | { |
5bf8be8b | 9704 | if (this->is_erroneous_call()) |
9705 | { | |
9706 | go_assert(saw_errors()); | |
9707 | return Expression::make_error(this->location()); | |
9708 | } | |
b8e86a51 | 9709 | |
91c0fd76 | 9710 | if (this->is_flattened_) |
9711 | return this; | |
9712 | this->is_flattened_ = true; | |
9713 | ||
b8e86a51 | 9714 | // Add temporary variables for all arguments that require type |
9715 | // conversion. | |
9716 | Function_type* fntype = this->get_function_type(); | |
9782d556 | 9717 | if (fntype == NULL) |
9718 | { | |
9719 | go_assert(saw_errors()); | |
9720 | return this; | |
9721 | } | |
b8e86a51 | 9722 | if (this->args_ != NULL && !this->args_->empty() |
9723 | && fntype->parameters() != NULL && !fntype->parameters()->empty()) | |
9724 | { | |
9725 | bool is_interface_method = | |
9726 | this->fn_->interface_field_reference_expression() != NULL; | |
9727 | ||
9728 | Expression_list *args = new Expression_list(); | |
9729 | Typed_identifier_list::const_iterator pp = fntype->parameters()->begin(); | |
9730 | Expression_list::const_iterator pa = this->args_->begin(); | |
9731 | if (!is_interface_method && fntype->is_method()) | |
9732 | { | |
9733 | // The receiver argument. | |
9734 | args->push_back(*pa); | |
9735 | ++pa; | |
9736 | } | |
9737 | for (; pa != this->args_->end(); ++pa, ++pp) | |
9738 | { | |
9739 | go_assert(pp != fntype->parameters()->end()); | |
9740 | if (Type::are_identical(pp->type(), (*pa)->type(), true, NULL)) | |
9741 | args->push_back(*pa); | |
9742 | else | |
9743 | { | |
9744 | Location loc = (*pa)->location(); | |
8ba8cc87 | 9745 | Expression* arg = *pa; |
9746 | if (!arg->is_variable()) | |
9747 | { | |
9748 | Temporary_statement *temp = | |
9749 | Statement::make_temporary(NULL, arg, loc); | |
9750 | inserter->insert(temp); | |
9751 | arg = Expression::make_temporary_reference(temp, loc); | |
9752 | } | |
9753 | arg = Expression::convert_for_assignment(gogo, pp->type(), arg, | |
9754 | loc); | |
9755 | args->push_back(arg); | |
b8e86a51 | 9756 | } |
9757 | } | |
9758 | delete this->args_; | |
9759 | this->args_ = args; | |
9760 | } | |
9761 | ||
2c809f8f | 9762 | size_t rc = this->result_count(); |
9763 | if (rc > 1 && this->call_temp_ == NULL) | |
9764 | { | |
9765 | Struct_field_list* sfl = new Struct_field_list(); | |
9766 | Function_type* fntype = this->get_function_type(); | |
9767 | const Typed_identifier_list* results = fntype->results(); | |
9768 | Location loc = this->location(); | |
9769 | ||
9770 | int i = 0; | |
61575e0f | 9771 | char buf[20]; |
2c809f8f | 9772 | for (Typed_identifier_list::const_iterator p = results->begin(); |
9773 | p != results->end(); | |
9774 | ++p, ++i) | |
9775 | { | |
9776 | snprintf(buf, sizeof buf, "res%d", i); | |
9777 | sfl->push_back(Struct_field(Typed_identifier(buf, p->type(), loc))); | |
9778 | } | |
9779 | ||
9780 | Struct_type* st = Type::make_struct_type(sfl, loc); | |
6bf4793c | 9781 | st->set_is_struct_incomparable(); |
2c809f8f | 9782 | this->call_temp_ = Statement::make_temporary(st, NULL, loc); |
9783 | inserter->insert(this->call_temp_); | |
9784 | } | |
9785 | ||
9786 | return this; | |
9787 | } | |
9788 | ||
ceeb4318 | 9789 | // Get the function type. This can return NULL in error cases. |
e440a328 | 9790 | |
9791 | Function_type* | |
9792 | Call_expression::get_function_type() const | |
9793 | { | |
9794 | return this->fn_->type()->function_type(); | |
9795 | } | |
9796 | ||
9797 | // Return the number of values which this call will return. | |
9798 | ||
9799 | size_t | |
9800 | Call_expression::result_count() const | |
9801 | { | |
9802 | const Function_type* fntype = this->get_function_type(); | |
9803 | if (fntype == NULL) | |
9804 | return 0; | |
9805 | if (fntype->results() == NULL) | |
9806 | return 0; | |
9807 | return fntype->results()->size(); | |
9808 | } | |
9809 | ||
ceeb4318 | 9810 | // Return the temporary which holds a result. |
9811 | ||
9812 | Temporary_statement* | |
9813 | Call_expression::result(size_t i) const | |
9814 | { | |
cd238b8d | 9815 | if (this->results_ == NULL || this->results_->size() <= i) |
9816 | { | |
9817 | go_assert(saw_errors()); | |
9818 | return NULL; | |
9819 | } | |
ceeb4318 | 9820 | return (*this->results_)[i]; |
9821 | } | |
9822 | ||
1373401e | 9823 | // Set the number of results expected from a call expression. |
9824 | ||
9825 | void | |
9826 | Call_expression::set_expected_result_count(size_t count) | |
9827 | { | |
9828 | go_assert(this->expected_result_count_ == 0); | |
9829 | this->expected_result_count_ = count; | |
9830 | } | |
9831 | ||
e440a328 | 9832 | // Return whether this is a call to the predeclared function recover. |
9833 | ||
9834 | bool | |
9835 | Call_expression::is_recover_call() const | |
9836 | { | |
9837 | return this->do_is_recover_call(); | |
9838 | } | |
9839 | ||
9840 | // Set the argument to the recover function. | |
9841 | ||
9842 | void | |
9843 | Call_expression::set_recover_arg(Expression* arg) | |
9844 | { | |
9845 | this->do_set_recover_arg(arg); | |
9846 | } | |
9847 | ||
9848 | // Virtual functions also implemented by Builtin_call_expression. | |
9849 | ||
9850 | bool | |
9851 | Call_expression::do_is_recover_call() const | |
9852 | { | |
9853 | return false; | |
9854 | } | |
9855 | ||
9856 | void | |
9857 | Call_expression::do_set_recover_arg(Expression*) | |
9858 | { | |
c3e6f413 | 9859 | go_unreachable(); |
e440a328 | 9860 | } |
9861 | ||
ceeb4318 | 9862 | // We have found an error with this call expression; return true if |
9863 | // we should report it. | |
9864 | ||
9865 | bool | |
9866 | Call_expression::issue_error() | |
9867 | { | |
9868 | if (this->issued_error_) | |
9869 | return false; | |
9870 | else | |
9871 | { | |
9872 | this->issued_error_ = true; | |
9873 | return true; | |
9874 | } | |
9875 | } | |
9876 | ||
5bf8be8b | 9877 | // Whether or not this call contains errors, either in the call or the |
9878 | // arguments to the call. | |
9879 | ||
9880 | bool | |
9881 | Call_expression::is_erroneous_call() | |
9882 | { | |
9883 | if (this->is_error_expression() || this->fn()->is_error_expression()) | |
9884 | return true; | |
9885 | ||
9886 | if (this->args() == NULL) | |
9887 | return false; | |
9888 | for (Expression_list::iterator pa = this->args()->begin(); | |
9889 | pa != this->args()->end(); | |
9890 | ++pa) | |
9891 | { | |
9892 | if ((*pa)->type()->is_error_type() || (*pa)->is_error_expression()) | |
9893 | return true; | |
9894 | } | |
9895 | return false; | |
9896 | } | |
9897 | ||
e440a328 | 9898 | // Get the type. |
9899 | ||
9900 | Type* | |
9901 | Call_expression::do_type() | |
9902 | { | |
9903 | if (this->type_ != NULL) | |
9904 | return this->type_; | |
9905 | ||
9906 | Type* ret; | |
9907 | Function_type* fntype = this->get_function_type(); | |
9908 | if (fntype == NULL) | |
9909 | return Type::make_error_type(); | |
9910 | ||
9911 | const Typed_identifier_list* results = fntype->results(); | |
9912 | if (results == NULL) | |
9913 | ret = Type::make_void_type(); | |
9914 | else if (results->size() == 1) | |
9915 | ret = results->begin()->type(); | |
9916 | else | |
9917 | ret = Type::make_call_multiple_result_type(this); | |
9918 | ||
9919 | this->type_ = ret; | |
9920 | ||
9921 | return this->type_; | |
9922 | } | |
9923 | ||
9924 | // Determine types for a call expression. We can use the function | |
9925 | // parameter types to set the types of the arguments. | |
9926 | ||
9927 | void | |
9928 | Call_expression::do_determine_type(const Type_context*) | |
9929 | { | |
fb94b0ca | 9930 | if (!this->determining_types()) |
9931 | return; | |
9932 | ||
e440a328 | 9933 | this->fn_->determine_type_no_context(); |
9934 | Function_type* fntype = this->get_function_type(); | |
9935 | const Typed_identifier_list* parameters = NULL; | |
9936 | if (fntype != NULL) | |
9937 | parameters = fntype->parameters(); | |
9938 | if (this->args_ != NULL) | |
9939 | { | |
9940 | Typed_identifier_list::const_iterator pt; | |
9941 | if (parameters != NULL) | |
9942 | pt = parameters->begin(); | |
09ea332d | 9943 | bool first = true; |
e440a328 | 9944 | for (Expression_list::const_iterator pa = this->args_->begin(); |
9945 | pa != this->args_->end(); | |
9946 | ++pa) | |
9947 | { | |
09ea332d | 9948 | if (first) |
9949 | { | |
9950 | first = false; | |
9951 | // If this is a method, the first argument is the | |
9952 | // receiver. | |
9953 | if (fntype != NULL && fntype->is_method()) | |
9954 | { | |
9955 | Type* rtype = fntype->receiver()->type(); | |
9956 | // The receiver is always passed as a pointer. | |
9957 | if (rtype->points_to() == NULL) | |
9958 | rtype = Type::make_pointer_type(rtype); | |
9959 | Type_context subcontext(rtype, false); | |
9960 | (*pa)->determine_type(&subcontext); | |
9961 | continue; | |
9962 | } | |
9963 | } | |
9964 | ||
e440a328 | 9965 | if (parameters != NULL && pt != parameters->end()) |
9966 | { | |
9967 | Type_context subcontext(pt->type(), false); | |
9968 | (*pa)->determine_type(&subcontext); | |
9969 | ++pt; | |
9970 | } | |
9971 | else | |
9972 | (*pa)->determine_type_no_context(); | |
9973 | } | |
9974 | } | |
9975 | } | |
9976 | ||
fb94b0ca | 9977 | // Called when determining types for a Call_expression. Return true |
9978 | // if we should go ahead, false if they have already been determined. | |
9979 | ||
9980 | bool | |
9981 | Call_expression::determining_types() | |
9982 | { | |
9983 | if (this->types_are_determined_) | |
9984 | return false; | |
9985 | else | |
9986 | { | |
9987 | this->types_are_determined_ = true; | |
9988 | return true; | |
9989 | } | |
9990 | } | |
9991 | ||
e440a328 | 9992 | // Check types for parameter I. |
9993 | ||
9994 | bool | |
9995 | Call_expression::check_argument_type(int i, const Type* parameter_type, | |
9996 | const Type* argument_type, | |
b13c66cd | 9997 | Location argument_location, |
e440a328 | 9998 | bool issued_error) |
9999 | { | |
10000 | std::string reason; | |
1eae365b | 10001 | if (!Type::are_assignable(parameter_type, argument_type, &reason)) |
e440a328 | 10002 | { |
10003 | if (!issued_error) | |
10004 | { | |
10005 | if (reason.empty()) | |
631d5788 | 10006 | go_error_at(argument_location, "argument %d has incompatible type", i); |
e440a328 | 10007 | else |
631d5788 | 10008 | go_error_at(argument_location, |
10009 | "argument %d has incompatible type (%s)", | |
10010 | i, reason.c_str()); | |
e440a328 | 10011 | } |
10012 | this->set_is_error(); | |
10013 | return false; | |
10014 | } | |
10015 | return true; | |
10016 | } | |
10017 | ||
10018 | // Check types. | |
10019 | ||
10020 | void | |
10021 | Call_expression::do_check_types(Gogo*) | |
10022 | { | |
a6645f74 | 10023 | if (this->classification() == EXPRESSION_ERROR) |
10024 | return; | |
10025 | ||
e440a328 | 10026 | Function_type* fntype = this->get_function_type(); |
10027 | if (fntype == NULL) | |
10028 | { | |
5c13bd80 | 10029 | if (!this->fn_->type()->is_error()) |
e440a328 | 10030 | this->report_error(_("expected function")); |
10031 | return; | |
10032 | } | |
10033 | ||
1373401e | 10034 | if (this->expected_result_count_ != 0 |
10035 | && this->expected_result_count_ != this->result_count()) | |
10036 | { | |
10037 | if (this->issue_error()) | |
10038 | this->report_error(_("function result count mismatch")); | |
10039 | this->set_is_error(); | |
10040 | return; | |
10041 | } | |
10042 | ||
09ea332d | 10043 | bool is_method = fntype->is_method(); |
10044 | if (is_method) | |
e440a328 | 10045 | { |
09ea332d | 10046 | go_assert(this->args_ != NULL && !this->args_->empty()); |
10047 | Type* rtype = fntype->receiver()->type(); | |
10048 | Expression* first_arg = this->args_->front(); | |
1eae365b | 10049 | // We dereference the values since receivers are always passed |
10050 | // as pointers. | |
09ea332d | 10051 | std::string reason; |
1eae365b | 10052 | if (!Type::are_assignable(rtype->deref(), first_arg->type()->deref(), |
10053 | &reason)) | |
e440a328 | 10054 | { |
09ea332d | 10055 | if (reason.empty()) |
10056 | this->report_error(_("incompatible type for receiver")); | |
10057 | else | |
e440a328 | 10058 | { |
631d5788 | 10059 | go_error_at(this->location(), |
10060 | "incompatible type for receiver (%s)", | |
10061 | reason.c_str()); | |
09ea332d | 10062 | this->set_is_error(); |
e440a328 | 10063 | } |
10064 | } | |
10065 | } | |
10066 | ||
10067 | // Note that varargs was handled by the lower_varargs() method, so | |
a6645f74 | 10068 | // we don't have to worry about it here unless something is wrong. |
10069 | if (this->is_varargs_ && !this->varargs_are_lowered_) | |
10070 | { | |
10071 | if (!fntype->is_varargs()) | |
10072 | { | |
631d5788 | 10073 | go_error_at(this->location(), |
10074 | _("invalid use of %<...%> calling non-variadic function")); | |
a6645f74 | 10075 | this->set_is_error(); |
10076 | return; | |
10077 | } | |
10078 | } | |
e440a328 | 10079 | |
10080 | const Typed_identifier_list* parameters = fntype->parameters(); | |
10081 | if (this->args_ == NULL) | |
10082 | { | |
10083 | if (parameters != NULL && !parameters->empty()) | |
10084 | this->report_error(_("not enough arguments")); | |
10085 | } | |
10086 | else if (parameters == NULL) | |
09ea332d | 10087 | { |
10088 | if (!is_method || this->args_->size() > 1) | |
10089 | this->report_error(_("too many arguments")); | |
10090 | } | |
1373401e | 10091 | else if (this->args_->size() == 1 |
10092 | && this->args_->front()->call_expression() != NULL | |
10093 | && this->args_->front()->call_expression()->result_count() > 1) | |
10094 | { | |
10095 | // This is F(G()) when G returns more than one result. If the | |
10096 | // results can be matched to parameters, it would have been | |
10097 | // lowered in do_lower. If we get here we know there is a | |
10098 | // mismatch. | |
10099 | if (this->args_->front()->call_expression()->result_count() | |
10100 | < parameters->size()) | |
10101 | this->report_error(_("not enough arguments")); | |
10102 | else | |
10103 | this->report_error(_("too many arguments")); | |
10104 | } | |
e440a328 | 10105 | else |
10106 | { | |
10107 | int i = 0; | |
09ea332d | 10108 | Expression_list::const_iterator pa = this->args_->begin(); |
10109 | if (is_method) | |
10110 | ++pa; | |
10111 | for (Typed_identifier_list::const_iterator pt = parameters->begin(); | |
10112 | pt != parameters->end(); | |
10113 | ++pt, ++pa, ++i) | |
e440a328 | 10114 | { |
09ea332d | 10115 | if (pa == this->args_->end()) |
e440a328 | 10116 | { |
09ea332d | 10117 | this->report_error(_("not enough arguments")); |
e440a328 | 10118 | return; |
10119 | } | |
10120 | this->check_argument_type(i + 1, pt->type(), (*pa)->type(), | |
10121 | (*pa)->location(), false); | |
10122 | } | |
09ea332d | 10123 | if (pa != this->args_->end()) |
10124 | this->report_error(_("too many arguments")); | |
e440a328 | 10125 | } |
10126 | } | |
10127 | ||
72666aed | 10128 | Expression* |
10129 | Call_expression::do_copy() | |
10130 | { | |
10131 | Call_expression* call = | |
10132 | Expression::make_call(this->fn_->copy(), | |
10133 | (this->args_ == NULL | |
10134 | ? NULL | |
10135 | : this->args_->copy()), | |
10136 | this->is_varargs_, this->location()); | |
10137 | ||
10138 | if (this->varargs_are_lowered_) | |
10139 | call->set_varargs_are_lowered(); | |
10140 | return call; | |
10141 | } | |
10142 | ||
e440a328 | 10143 | // Return whether we have to use a temporary variable to ensure that |
10144 | // we evaluate this call expression in order. If the call returns no | |
ceeb4318 | 10145 | // results then it will inevitably be executed last. |
e440a328 | 10146 | |
10147 | bool | |
10148 | Call_expression::do_must_eval_in_order() const | |
10149 | { | |
ceeb4318 | 10150 | return this->result_count() > 0; |
e440a328 | 10151 | } |
10152 | ||
e440a328 | 10153 | // Get the function and the first argument to use when calling an |
10154 | // interface method. | |
10155 | ||
2387f644 | 10156 | Expression* |
e440a328 | 10157 | Call_expression::interface_method_function( |
e440a328 | 10158 | Interface_field_reference_expression* interface_method, |
db122cb9 | 10159 | Expression** first_arg_ptr, |
10160 | Location location) | |
e440a328 | 10161 | { |
db122cb9 | 10162 | Expression* object = interface_method->get_underlying_object(); |
10163 | Type* unsafe_ptr_type = Type::make_pointer_type(Type::make_void_type()); | |
10164 | *first_arg_ptr = | |
10165 | Expression::make_unsafe_cast(unsafe_ptr_type, object, location); | |
2387f644 | 10166 | return interface_method->get_function(); |
e440a328 | 10167 | } |
10168 | ||
10169 | // Build the call expression. | |
10170 | ||
ea664253 | 10171 | Bexpression* |
10172 | Call_expression::do_get_backend(Translate_context* context) | |
e440a328 | 10173 | { |
2c809f8f | 10174 | if (this->call_ != NULL) |
ea664253 | 10175 | return this->call_; |
e440a328 | 10176 | |
10177 | Function_type* fntype = this->get_function_type(); | |
10178 | if (fntype == NULL) | |
ea664253 | 10179 | return context->backend()->error_expression(); |
e440a328 | 10180 | |
10181 | if (this->fn_->is_error_expression()) | |
ea664253 | 10182 | return context->backend()->error_expression(); |
e440a328 | 10183 | |
10184 | Gogo* gogo = context->gogo(); | |
b13c66cd | 10185 | Location location = this->location(); |
e440a328 | 10186 | |
10187 | Func_expression* func = this->fn_->func_expression(); | |
e440a328 | 10188 | Interface_field_reference_expression* interface_method = |
10189 | this->fn_->interface_field_reference_expression(); | |
10190 | const bool has_closure = func != NULL && func->closure() != NULL; | |
09ea332d | 10191 | const bool is_interface_method = interface_method != NULL; |
e440a328 | 10192 | |
f8bdf81a | 10193 | bool has_closure_arg; |
8381eda7 | 10194 | if (has_closure) |
f8bdf81a | 10195 | has_closure_arg = true; |
8381eda7 | 10196 | else if (func != NULL) |
f8bdf81a | 10197 | has_closure_arg = false; |
8381eda7 | 10198 | else if (is_interface_method) |
f8bdf81a | 10199 | has_closure_arg = false; |
8381eda7 | 10200 | else |
f8bdf81a | 10201 | has_closure_arg = true; |
8381eda7 | 10202 | |
e440a328 | 10203 | int nargs; |
2c809f8f | 10204 | std::vector<Bexpression*> fn_args; |
e440a328 | 10205 | if (this->args_ == NULL || this->args_->empty()) |
10206 | { | |
f8bdf81a | 10207 | nargs = is_interface_method ? 1 : 0; |
2c809f8f | 10208 | if (nargs > 0) |
10209 | fn_args.resize(1); | |
e440a328 | 10210 | } |
09ea332d | 10211 | else if (fntype->parameters() == NULL || fntype->parameters()->empty()) |
10212 | { | |
10213 | // Passing a receiver parameter. | |
10214 | go_assert(!is_interface_method | |
10215 | && fntype->is_method() | |
10216 | && this->args_->size() == 1); | |
f8bdf81a | 10217 | nargs = 1; |
2c809f8f | 10218 | fn_args.resize(1); |
ea664253 | 10219 | fn_args[0] = this->args_->front()->get_backend(context); |
09ea332d | 10220 | } |
e440a328 | 10221 | else |
10222 | { | |
10223 | const Typed_identifier_list* params = fntype->parameters(); | |
e440a328 | 10224 | |
10225 | nargs = this->args_->size(); | |
09ea332d | 10226 | int i = is_interface_method ? 1 : 0; |
e440a328 | 10227 | nargs += i; |
2c809f8f | 10228 | fn_args.resize(nargs); |
e440a328 | 10229 | |
10230 | Typed_identifier_list::const_iterator pp = params->begin(); | |
09ea332d | 10231 | Expression_list::const_iterator pe = this->args_->begin(); |
10232 | if (!is_interface_method && fntype->is_method()) | |
10233 | { | |
ea664253 | 10234 | fn_args[i] = (*pe)->get_backend(context); |
09ea332d | 10235 | ++pe; |
10236 | ++i; | |
10237 | } | |
10238 | for (; pe != this->args_->end(); ++pe, ++pp, ++i) | |
e440a328 | 10239 | { |
c484d925 | 10240 | go_assert(pp != params->end()); |
2c809f8f | 10241 | Expression* arg = |
10242 | Expression::convert_for_assignment(gogo, pp->type(), *pe, | |
10243 | location); | |
ea664253 | 10244 | fn_args[i] = arg->get_backend(context); |
e440a328 | 10245 | } |
c484d925 | 10246 | go_assert(pp == params->end()); |
f8bdf81a | 10247 | go_assert(i == nargs); |
e440a328 | 10248 | } |
10249 | ||
2c809f8f | 10250 | Expression* fn; |
10251 | Expression* closure = NULL; | |
8381eda7 | 10252 | if (func != NULL) |
10253 | { | |
10254 | Named_object* no = func->named_object(); | |
2c809f8f | 10255 | fn = Expression::make_func_code_reference(no, location); |
10256 | if (has_closure) | |
10257 | closure = func->closure(); | |
8381eda7 | 10258 | } |
09ea332d | 10259 | else if (!is_interface_method) |
8381eda7 | 10260 | { |
2c809f8f | 10261 | closure = this->fn_; |
10262 | ||
10263 | // The backend representation of this function type is a pointer | |
10264 | // to a struct whose first field is the actual function to call. | |
10265 | Type* pfntype = | |
10266 | Type::make_pointer_type( | |
10267 | Type::make_pointer_type(Type::make_void_type())); | |
10268 | fn = Expression::make_unsafe_cast(pfntype, this->fn_, location); | |
10269 | fn = Expression::make_unary(OPERATOR_MULT, fn, location); | |
10270 | } | |
e440a328 | 10271 | else |
cf609de4 | 10272 | { |
2387f644 | 10273 | Expression* first_arg; |
db122cb9 | 10274 | fn = this->interface_method_function(interface_method, &first_arg, |
10275 | location); | |
ea664253 | 10276 | fn_args[0] = first_arg->get_backend(context); |
e440a328 | 10277 | } |
10278 | ||
1ecc6157 | 10279 | Bexpression* bclosure = NULL; |
10280 | if (has_closure_arg) | |
10281 | bclosure = closure->get_backend(context); | |
f8bdf81a | 10282 | else |
1ecc6157 | 10283 | go_assert(closure == NULL); |
f8bdf81a | 10284 | |
ea664253 | 10285 | Bexpression* bfn = fn->get_backend(context); |
80d1e1a8 | 10286 | |
10287 | // When not calling a named function directly, use a type conversion | |
10288 | // in case the type of the function is a recursive type which refers | |
10289 | // to itself. We don't do this for an interface method because 1) | |
10290 | // an interface method never refers to itself, so we always have a | |
10291 | // function type here; 2) we pass an extra first argument to an | |
10292 | // interface method, so fntype is not correct. | |
10293 | if (func == NULL && !is_interface_method) | |
10294 | { | |
10295 | Btype* bft = fntype->get_backend_fntype(gogo); | |
10296 | bfn = gogo->backend()->convert_expression(bft, bfn, location); | |
10297 | } | |
10298 | ||
4ced7af9 | 10299 | Bfunction* bfunction = NULL; |
10300 | if (context->function()) | |
10301 | bfunction = context->function()->func_value()->get_decl(); | |
10302 | Bexpression* call = gogo->backend()->call_expression(bfunction, bfn, | |
10303 | fn_args, bclosure, | |
10304 | location); | |
e440a328 | 10305 | |
2c809f8f | 10306 | if (this->results_ != NULL) |
e440a328 | 10307 | { |
03118c21 | 10308 | Bexpression* bcall_ref = this->call_result_ref(context); |
2c809f8f | 10309 | Bstatement* assn_stmt = |
0ab48656 | 10310 | gogo->backend()->assignment_statement(bfunction, |
10311 | bcall_ref, call, location); | |
e440a328 | 10312 | |
03118c21 | 10313 | this->call_ = this->set_results(context); |
e440a328 | 10314 | |
2c809f8f | 10315 | Bexpression* set_and_call = |
10316 | gogo->backend()->compound_expression(assn_stmt, this->call_, | |
10317 | location); | |
ea664253 | 10318 | return set_and_call; |
2c809f8f | 10319 | } |
e440a328 | 10320 | |
2c809f8f | 10321 | this->call_ = call; |
ea664253 | 10322 | return this->call_; |
e440a328 | 10323 | } |
10324 | ||
03118c21 | 10325 | // Return the backend representation of a reference to the struct used |
10326 | // to capture the result of a multiple-output call. | |
10327 | ||
10328 | Bexpression* | |
10329 | Call_expression::call_result_ref(Translate_context* context) | |
10330 | { | |
10331 | go_assert(this->call_temp_ != NULL); | |
10332 | Location location = this->location(); | |
10333 | Expression* call_ref = | |
10334 | Expression::make_temporary_reference(this->call_temp_, location); | |
10335 | Bexpression* bcall_ref = call_ref->get_backend(context); | |
10336 | return bcall_ref; | |
10337 | } | |
10338 | ||
ceeb4318 | 10339 | // Set the result variables if this call returns multiple results. |
10340 | ||
2c809f8f | 10341 | Bexpression* |
03118c21 | 10342 | Call_expression::set_results(Translate_context* context) |
ceeb4318 | 10343 | { |
2c809f8f | 10344 | Gogo* gogo = context->gogo(); |
ceeb4318 | 10345 | |
2c809f8f | 10346 | Bexpression* results = NULL; |
b13c66cd | 10347 | Location loc = this->location(); |
2c809f8f | 10348 | |
03118c21 | 10349 | go_assert(this->call_temp_ != NULL); |
10350 | ||
ceeb4318 | 10351 | size_t rc = this->result_count(); |
2c809f8f | 10352 | for (size_t i = 0; i < rc; ++i) |
ceeb4318 | 10353 | { |
ceeb4318 | 10354 | Temporary_statement* temp = this->result(i); |
cd238b8d | 10355 | if (temp == NULL) |
10356 | { | |
10357 | go_assert(saw_errors()); | |
2c809f8f | 10358 | return gogo->backend()->error_expression(); |
cd238b8d | 10359 | } |
ceeb4318 | 10360 | Temporary_reference_expression* ref = |
10361 | Expression::make_temporary_reference(temp, loc); | |
10362 | ref->set_is_lvalue(); | |
ceeb4318 | 10363 | |
0ab48656 | 10364 | Bfunction* bfunction = context->function()->func_value()->get_decl(); |
ea664253 | 10365 | Bexpression* result_ref = ref->get_backend(context); |
03118c21 | 10366 | Bexpression* bcall_ref = this->call_result_ref(context); |
2c809f8f | 10367 | Bexpression* call_result = |
03118c21 | 10368 | gogo->backend()->struct_field_expression(bcall_ref, i, loc); |
2c809f8f | 10369 | Bstatement* assn_stmt = |
0ab48656 | 10370 | gogo->backend()->assignment_statement(bfunction, |
10371 | result_ref, call_result, loc); | |
ceeb4318 | 10372 | |
03118c21 | 10373 | bcall_ref = this->call_result_ref(context); |
10374 | call_result = gogo->backend()->struct_field_expression(bcall_ref, i, loc); | |
2c809f8f | 10375 | Bexpression* result = |
10376 | gogo->backend()->compound_expression(assn_stmt, call_result, loc); | |
ceeb4318 | 10377 | |
2c809f8f | 10378 | if (results == NULL) |
10379 | results = result; | |
10380 | else | |
10381 | { | |
0ab48656 | 10382 | Bstatement* expr_stmt = |
10383 | gogo->backend()->expression_statement(bfunction, result); | |
2c809f8f | 10384 | results = |
10385 | gogo->backend()->compound_expression(expr_stmt, results, loc); | |
10386 | } | |
10387 | } | |
10388 | return results; | |
ceeb4318 | 10389 | } |
10390 | ||
d751bb78 | 10391 | // Dump ast representation for a call expressin. |
10392 | ||
10393 | void | |
10394 | Call_expression::do_dump_expression(Ast_dump_context* ast_dump_context) const | |
10395 | { | |
10396 | this->fn_->dump_expression(ast_dump_context); | |
10397 | ast_dump_context->ostream() << "("; | |
10398 | if (args_ != NULL) | |
10399 | ast_dump_context->dump_expression_list(this->args_); | |
10400 | ||
10401 | ast_dump_context->ostream() << ") "; | |
10402 | } | |
10403 | ||
e440a328 | 10404 | // Make a call expression. |
10405 | ||
10406 | Call_expression* | |
10407 | Expression::make_call(Expression* fn, Expression_list* args, bool is_varargs, | |
b13c66cd | 10408 | Location location) |
e440a328 | 10409 | { |
10410 | return new Call_expression(fn, args, is_varargs, location); | |
10411 | } | |
10412 | ||
da244e59 | 10413 | // Class Call_result_expression. |
e440a328 | 10414 | |
10415 | // Traverse a call result. | |
10416 | ||
10417 | int | |
10418 | Call_result_expression::do_traverse(Traverse* traverse) | |
10419 | { | |
10420 | if (traverse->remember_expression(this->call_)) | |
10421 | { | |
10422 | // We have already traversed the call expression. | |
10423 | return TRAVERSE_CONTINUE; | |
10424 | } | |
10425 | return Expression::traverse(&this->call_, traverse); | |
10426 | } | |
10427 | ||
10428 | // Get the type. | |
10429 | ||
10430 | Type* | |
10431 | Call_result_expression::do_type() | |
10432 | { | |
425dd051 | 10433 | if (this->classification() == EXPRESSION_ERROR) |
10434 | return Type::make_error_type(); | |
10435 | ||
e440a328 | 10436 | // THIS->CALL_ can be replaced with a temporary reference due to |
10437 | // Call_expression::do_must_eval_in_order when there is an error. | |
10438 | Call_expression* ce = this->call_->call_expression(); | |
10439 | if (ce == NULL) | |
5e85f268 | 10440 | { |
10441 | this->set_is_error(); | |
10442 | return Type::make_error_type(); | |
10443 | } | |
e440a328 | 10444 | Function_type* fntype = ce->get_function_type(); |
10445 | if (fntype == NULL) | |
5e85f268 | 10446 | { |
e37658e2 | 10447 | if (ce->issue_error()) |
99b3f06f | 10448 | { |
10449 | if (!ce->fn()->type()->is_error()) | |
10450 | this->report_error(_("expected function")); | |
10451 | } | |
5e85f268 | 10452 | this->set_is_error(); |
10453 | return Type::make_error_type(); | |
10454 | } | |
e440a328 | 10455 | const Typed_identifier_list* results = fntype->results(); |
ceeb4318 | 10456 | if (results == NULL || results->size() < 2) |
7b8d861f | 10457 | { |
ceeb4318 | 10458 | if (ce->issue_error()) |
10459 | this->report_error(_("number of results does not match " | |
10460 | "number of values")); | |
7b8d861f | 10461 | return Type::make_error_type(); |
10462 | } | |
e440a328 | 10463 | Typed_identifier_list::const_iterator pr = results->begin(); |
10464 | for (unsigned int i = 0; i < this->index_; ++i) | |
10465 | { | |
10466 | if (pr == results->end()) | |
425dd051 | 10467 | break; |
e440a328 | 10468 | ++pr; |
10469 | } | |
10470 | if (pr == results->end()) | |
425dd051 | 10471 | { |
ceeb4318 | 10472 | if (ce->issue_error()) |
10473 | this->report_error(_("number of results does not match " | |
10474 | "number of values")); | |
425dd051 | 10475 | return Type::make_error_type(); |
10476 | } | |
e440a328 | 10477 | return pr->type(); |
10478 | } | |
10479 | ||
425dd051 | 10480 | // Check the type. Just make sure that we trigger the warning in |
10481 | // do_type. | |
e440a328 | 10482 | |
10483 | void | |
10484 | Call_result_expression::do_check_types(Gogo*) | |
10485 | { | |
425dd051 | 10486 | this->type(); |
e440a328 | 10487 | } |
10488 | ||
10489 | // Determine the type. We have nothing to do here, but the 0 result | |
10490 | // needs to pass down to the caller. | |
10491 | ||
10492 | void | |
10493 | Call_result_expression::do_determine_type(const Type_context*) | |
10494 | { | |
fb94b0ca | 10495 | this->call_->determine_type_no_context(); |
e440a328 | 10496 | } |
10497 | ||
ea664253 | 10498 | // Return the backend representation. We just refer to the temporary set by the |
10499 | // call expression. We don't do this at lowering time because it makes it | |
ceeb4318 | 10500 | // hard to evaluate the call at the right time. |
e440a328 | 10501 | |
ea664253 | 10502 | Bexpression* |
10503 | Call_result_expression::do_get_backend(Translate_context* context) | |
e440a328 | 10504 | { |
ceeb4318 | 10505 | Call_expression* ce = this->call_->call_expression(); |
cd238b8d | 10506 | if (ce == NULL) |
10507 | { | |
10508 | go_assert(this->call_->is_error_expression()); | |
ea664253 | 10509 | return context->backend()->error_expression(); |
cd238b8d | 10510 | } |
ceeb4318 | 10511 | Temporary_statement* ts = ce->result(this->index_); |
cd238b8d | 10512 | if (ts == NULL) |
10513 | { | |
10514 | go_assert(saw_errors()); | |
ea664253 | 10515 | return context->backend()->error_expression(); |
cd238b8d | 10516 | } |
ceeb4318 | 10517 | Expression* ref = Expression::make_temporary_reference(ts, this->location()); |
ea664253 | 10518 | return ref->get_backend(context); |
e440a328 | 10519 | } |
10520 | ||
d751bb78 | 10521 | // Dump ast representation for a call result expression. |
10522 | ||
10523 | void | |
10524 | Call_result_expression::do_dump_expression(Ast_dump_context* ast_dump_context) | |
10525 | const | |
10526 | { | |
10527 | // FIXME: Wouldn't it be better if the call is assigned to a temporary | |
10528 | // (struct) and the fields are referenced instead. | |
10529 | ast_dump_context->ostream() << this->index_ << "@("; | |
10530 | ast_dump_context->dump_expression(this->call_); | |
10531 | ast_dump_context->ostream() << ")"; | |
10532 | } | |
10533 | ||
e440a328 | 10534 | // Make a reference to a single result of a call which returns |
10535 | // multiple results. | |
10536 | ||
10537 | Expression* | |
10538 | Expression::make_call_result(Call_expression* call, unsigned int index) | |
10539 | { | |
10540 | return new Call_result_expression(call, index); | |
10541 | } | |
10542 | ||
10543 | // Class Index_expression. | |
10544 | ||
10545 | // Traversal. | |
10546 | ||
10547 | int | |
10548 | Index_expression::do_traverse(Traverse* traverse) | |
10549 | { | |
10550 | if (Expression::traverse(&this->left_, traverse) == TRAVERSE_EXIT | |
10551 | || Expression::traverse(&this->start_, traverse) == TRAVERSE_EXIT | |
10552 | || (this->end_ != NULL | |
acf2b673 | 10553 | && Expression::traverse(&this->end_, traverse) == TRAVERSE_EXIT) |
10554 | || (this->cap_ != NULL | |
10555 | && Expression::traverse(&this->cap_, traverse) == TRAVERSE_EXIT)) | |
e440a328 | 10556 | return TRAVERSE_EXIT; |
10557 | return TRAVERSE_CONTINUE; | |
10558 | } | |
10559 | ||
10560 | // Lower an index expression. This converts the generic index | |
10561 | // expression into an array index, a string index, or a map index. | |
10562 | ||
10563 | Expression* | |
ceeb4318 | 10564 | Index_expression::do_lower(Gogo*, Named_object*, Statement_inserter*, int) |
e440a328 | 10565 | { |
b13c66cd | 10566 | Location location = this->location(); |
e440a328 | 10567 | Expression* left = this->left_; |
10568 | Expression* start = this->start_; | |
10569 | Expression* end = this->end_; | |
acf2b673 | 10570 | Expression* cap = this->cap_; |
e440a328 | 10571 | |
10572 | Type* type = left->type(); | |
5c13bd80 | 10573 | if (type->is_error()) |
d9f3743a | 10574 | { |
10575 | go_assert(saw_errors()); | |
10576 | return Expression::make_error(location); | |
10577 | } | |
b0cf7ddd | 10578 | else if (left->is_type_expression()) |
10579 | { | |
631d5788 | 10580 | go_error_at(location, "attempt to index type expression"); |
b0cf7ddd | 10581 | return Expression::make_error(location); |
10582 | } | |
e440a328 | 10583 | else if (type->array_type() != NULL) |
acf2b673 | 10584 | return Expression::make_array_index(left, start, end, cap, location); |
e440a328 | 10585 | else if (type->points_to() != NULL |
10586 | && type->points_to()->array_type() != NULL | |
411eb89e | 10587 | && !type->points_to()->is_slice_type()) |
e440a328 | 10588 | { |
10589 | Expression* deref = Expression::make_unary(OPERATOR_MULT, left, | |
10590 | location); | |
38092374 | 10591 | |
10592 | // For an ordinary index into the array, the pointer will be | |
10593 | // dereferenced. For a slice it will not--the resulting slice | |
10594 | // will simply reuse the pointer, which is incorrect if that | |
10595 | // pointer is nil. | |
10596 | if (end != NULL || cap != NULL) | |
10597 | deref->issue_nil_check(); | |
10598 | ||
acf2b673 | 10599 | return Expression::make_array_index(deref, start, end, cap, location); |
e440a328 | 10600 | } |
10601 | else if (type->is_string_type()) | |
acf2b673 | 10602 | { |
10603 | if (cap != NULL) | |
10604 | { | |
631d5788 | 10605 | go_error_at(location, "invalid 3-index slice of string"); |
acf2b673 | 10606 | return Expression::make_error(location); |
10607 | } | |
10608 | return Expression::make_string_index(left, start, end, location); | |
10609 | } | |
e440a328 | 10610 | else if (type->map_type() != NULL) |
10611 | { | |
acf2b673 | 10612 | if (end != NULL || cap != NULL) |
e440a328 | 10613 | { |
631d5788 | 10614 | go_error_at(location, "invalid slice of map"); |
e440a328 | 10615 | return Expression::make_error(location); |
10616 | } | |
0d5530d9 | 10617 | return Expression::make_map_index(left, start, location); |
e440a328 | 10618 | } |
b1aba207 | 10619 | else if (cap != NULL) |
10620 | { | |
10621 | go_error_at(location, | |
10622 | "invalid 3-index slice of object that is not a slice"); | |
10623 | return Expression::make_error(location); | |
10624 | } | |
10625 | else if (end != NULL) | |
10626 | { | |
10627 | go_error_at(location, | |
10628 | ("attempt to slice object that is not " | |
10629 | "array, slice, or string")); | |
10630 | return Expression::make_error(location); | |
10631 | } | |
e440a328 | 10632 | else |
10633 | { | |
631d5788 | 10634 | go_error_at(location, |
b1aba207 | 10635 | ("attempt to index object that is not " |
10636 | "array, slice, string, or map")); | |
e440a328 | 10637 | return Expression::make_error(location); |
10638 | } | |
10639 | } | |
10640 | ||
acf2b673 | 10641 | // Write an indexed expression |
10642 | // (expr[expr:expr:expr], expr[expr:expr] or expr[expr]) to a dump context. | |
d751bb78 | 10643 | |
10644 | void | |
10645 | Index_expression::dump_index_expression(Ast_dump_context* ast_dump_context, | |
10646 | const Expression* expr, | |
10647 | const Expression* start, | |
acf2b673 | 10648 | const Expression* end, |
10649 | const Expression* cap) | |
d751bb78 | 10650 | { |
10651 | expr->dump_expression(ast_dump_context); | |
10652 | ast_dump_context->ostream() << "["; | |
10653 | start->dump_expression(ast_dump_context); | |
10654 | if (end != NULL) | |
10655 | { | |
10656 | ast_dump_context->ostream() << ":"; | |
10657 | end->dump_expression(ast_dump_context); | |
10658 | } | |
acf2b673 | 10659 | if (cap != NULL) |
10660 | { | |
10661 | ast_dump_context->ostream() << ":"; | |
10662 | cap->dump_expression(ast_dump_context); | |
10663 | } | |
d751bb78 | 10664 | ast_dump_context->ostream() << "]"; |
10665 | } | |
10666 | ||
10667 | // Dump ast representation for an index expression. | |
10668 | ||
10669 | void | |
10670 | Index_expression::do_dump_expression(Ast_dump_context* ast_dump_context) | |
10671 | const | |
10672 | { | |
10673 | Index_expression::dump_index_expression(ast_dump_context, this->left_, | |
acf2b673 | 10674 | this->start_, this->end_, this->cap_); |
d751bb78 | 10675 | } |
10676 | ||
e440a328 | 10677 | // Make an index expression. |
10678 | ||
10679 | Expression* | |
10680 | Expression::make_index(Expression* left, Expression* start, Expression* end, | |
acf2b673 | 10681 | Expression* cap, Location location) |
e440a328 | 10682 | { |
acf2b673 | 10683 | return new Index_expression(left, start, end, cap, location); |
e440a328 | 10684 | } |
10685 | ||
da244e59 | 10686 | // Class Array_index_expression. |
e440a328 | 10687 | |
10688 | // Array index traversal. | |
10689 | ||
10690 | int | |
10691 | Array_index_expression::do_traverse(Traverse* traverse) | |
10692 | { | |
10693 | if (Expression::traverse(&this->array_, traverse) == TRAVERSE_EXIT) | |
10694 | return TRAVERSE_EXIT; | |
10695 | if (Expression::traverse(&this->start_, traverse) == TRAVERSE_EXIT) | |
10696 | return TRAVERSE_EXIT; | |
10697 | if (this->end_ != NULL) | |
10698 | { | |
10699 | if (Expression::traverse(&this->end_, traverse) == TRAVERSE_EXIT) | |
10700 | return TRAVERSE_EXIT; | |
10701 | } | |
acf2b673 | 10702 | if (this->cap_ != NULL) |
10703 | { | |
10704 | if (Expression::traverse(&this->cap_, traverse) == TRAVERSE_EXIT) | |
10705 | return TRAVERSE_EXIT; | |
10706 | } | |
e440a328 | 10707 | return TRAVERSE_CONTINUE; |
10708 | } | |
10709 | ||
10710 | // Return the type of an array index. | |
10711 | ||
10712 | Type* | |
10713 | Array_index_expression::do_type() | |
10714 | { | |
10715 | if (this->type_ == NULL) | |
10716 | { | |
10717 | Array_type* type = this->array_->type()->array_type(); | |
10718 | if (type == NULL) | |
10719 | this->type_ = Type::make_error_type(); | |
10720 | else if (this->end_ == NULL) | |
10721 | this->type_ = type->element_type(); | |
411eb89e | 10722 | else if (type->is_slice_type()) |
e440a328 | 10723 | { |
10724 | // A slice of a slice has the same type as the original | |
10725 | // slice. | |
10726 | this->type_ = this->array_->type()->deref(); | |
10727 | } | |
10728 | else | |
10729 | { | |
10730 | // A slice of an array is a slice. | |
10731 | this->type_ = Type::make_array_type(type->element_type(), NULL); | |
10732 | } | |
10733 | } | |
10734 | return this->type_; | |
10735 | } | |
10736 | ||
10737 | // Set the type of an array index. | |
10738 | ||
10739 | void | |
10740 | Array_index_expression::do_determine_type(const Type_context*) | |
10741 | { | |
10742 | this->array_->determine_type_no_context(); | |
f77aa642 | 10743 | |
10744 | Type_context index_context(Type::lookup_integer_type("int"), false); | |
10745 | if (this->start_->is_constant()) | |
10746 | this->start_->determine_type(&index_context); | |
10747 | else | |
10748 | this->start_->determine_type_no_context(); | |
e440a328 | 10749 | if (this->end_ != NULL) |
f77aa642 | 10750 | { |
10751 | if (this->end_->is_constant()) | |
10752 | this->end_->determine_type(&index_context); | |
10753 | else | |
10754 | this->end_->determine_type_no_context(); | |
10755 | } | |
acf2b673 | 10756 | if (this->cap_ != NULL) |
f77aa642 | 10757 | { |
10758 | if (this->cap_->is_constant()) | |
10759 | this->cap_->determine_type(&index_context); | |
10760 | else | |
10761 | this->cap_->determine_type_no_context(); | |
10762 | } | |
e440a328 | 10763 | } |
10764 | ||
10765 | // Check types of an array index. | |
10766 | ||
10767 | void | |
d0a50ed8 | 10768 | Array_index_expression::do_check_types(Gogo* gogo) |
e440a328 | 10769 | { |
f6bc81e6 | 10770 | Numeric_constant nc; |
10771 | unsigned long v; | |
10772 | if (this->start_->type()->integer_type() == NULL | |
10773 | && !this->start_->type()->is_error() | |
10774 | && (!this->start_->numeric_constant_value(&nc) | |
10775 | || nc.to_unsigned_long(&v) == Numeric_constant::NC_UL_NOTINT)) | |
e440a328 | 10776 | this->report_error(_("index must be integer")); |
10777 | if (this->end_ != NULL | |
10778 | && this->end_->type()->integer_type() == NULL | |
99b3f06f | 10779 | && !this->end_->type()->is_error() |
10780 | && !this->end_->is_nil_expression() | |
f6bc81e6 | 10781 | && !this->end_->is_error_expression() |
10782 | && (!this->end_->numeric_constant_value(&nc) | |
10783 | || nc.to_unsigned_long(&v) == Numeric_constant::NC_UL_NOTINT)) | |
e440a328 | 10784 | this->report_error(_("slice end must be integer")); |
acf2b673 | 10785 | if (this->cap_ != NULL |
10786 | && this->cap_->type()->integer_type() == NULL | |
10787 | && !this->cap_->type()->is_error() | |
10788 | && !this->cap_->is_nil_expression() | |
10789 | && !this->cap_->is_error_expression() | |
10790 | && (!this->cap_->numeric_constant_value(&nc) | |
10791 | || nc.to_unsigned_long(&v) == Numeric_constant::NC_UL_NOTINT)) | |
10792 | this->report_error(_("slice capacity must be integer")); | |
e440a328 | 10793 | |
10794 | Array_type* array_type = this->array_->type()->array_type(); | |
f9c68f17 | 10795 | if (array_type == NULL) |
10796 | { | |
c484d925 | 10797 | go_assert(this->array_->type()->is_error()); |
f9c68f17 | 10798 | return; |
10799 | } | |
e440a328 | 10800 | |
10801 | unsigned int int_bits = | |
10802 | Type::lookup_integer_type("int")->integer_type()->bits(); | |
10803 | ||
0c77715b | 10804 | Numeric_constant lvalnc; |
e440a328 | 10805 | mpz_t lval; |
e440a328 | 10806 | bool lval_valid = (array_type->length() != NULL |
0c77715b | 10807 | && array_type->length()->numeric_constant_value(&lvalnc) |
10808 | && lvalnc.to_int(&lval)); | |
10809 | Numeric_constant inc; | |
e440a328 | 10810 | mpz_t ival; |
0bd5d859 | 10811 | bool ival_valid = false; |
0c77715b | 10812 | if (this->start_->numeric_constant_value(&inc) && inc.to_int(&ival)) |
e440a328 | 10813 | { |
0bd5d859 | 10814 | ival_valid = true; |
e440a328 | 10815 | if (mpz_sgn(ival) < 0 |
10816 | || mpz_sizeinbase(ival, 2) >= int_bits | |
10817 | || (lval_valid | |
10818 | && (this->end_ == NULL | |
10819 | ? mpz_cmp(ival, lval) >= 0 | |
10820 | : mpz_cmp(ival, lval) > 0))) | |
10821 | { | |
631d5788 | 10822 | go_error_at(this->start_->location(), "array index out of bounds"); |
e440a328 | 10823 | this->set_is_error(); |
10824 | } | |
10825 | } | |
10826 | if (this->end_ != NULL && !this->end_->is_nil_expression()) | |
10827 | { | |
0c77715b | 10828 | Numeric_constant enc; |
10829 | mpz_t eval; | |
acf2b673 | 10830 | bool eval_valid = false; |
0c77715b | 10831 | if (this->end_->numeric_constant_value(&enc) && enc.to_int(&eval)) |
e440a328 | 10832 | { |
acf2b673 | 10833 | eval_valid = true; |
0c77715b | 10834 | if (mpz_sgn(eval) < 0 |
10835 | || mpz_sizeinbase(eval, 2) >= int_bits | |
10836 | || (lval_valid && mpz_cmp(eval, lval) > 0)) | |
e440a328 | 10837 | { |
631d5788 | 10838 | go_error_at(this->end_->location(), "array index out of bounds"); |
e440a328 | 10839 | this->set_is_error(); |
10840 | } | |
0bd5d859 | 10841 | else if (ival_valid && mpz_cmp(ival, eval) > 0) |
10842 | this->report_error(_("inverted slice range")); | |
e440a328 | 10843 | } |
acf2b673 | 10844 | |
10845 | Numeric_constant cnc; | |
10846 | mpz_t cval; | |
10847 | if (this->cap_ != NULL | |
10848 | && this->cap_->numeric_constant_value(&cnc) && cnc.to_int(&cval)) | |
10849 | { | |
10850 | if (mpz_sgn(cval) < 0 | |
10851 | || mpz_sizeinbase(cval, 2) >= int_bits | |
10852 | || (lval_valid && mpz_cmp(cval, lval) > 0)) | |
10853 | { | |
631d5788 | 10854 | go_error_at(this->cap_->location(), "array index out of bounds"); |
acf2b673 | 10855 | this->set_is_error(); |
10856 | } | |
10857 | else if (ival_valid && mpz_cmp(ival, cval) > 0) | |
10858 | { | |
631d5788 | 10859 | go_error_at(this->cap_->location(), |
10860 | "invalid slice index: capacity less than start"); | |
acf2b673 | 10861 | this->set_is_error(); |
10862 | } | |
10863 | else if (eval_valid && mpz_cmp(eval, cval) > 0) | |
10864 | { | |
631d5788 | 10865 | go_error_at(this->cap_->location(), |
10866 | "invalid slice index: capacity less than length"); | |
acf2b673 | 10867 | this->set_is_error(); |
10868 | } | |
10869 | mpz_clear(cval); | |
10870 | } | |
10871 | ||
10872 | if (eval_valid) | |
10873 | mpz_clear(eval); | |
e440a328 | 10874 | } |
0bd5d859 | 10875 | if (ival_valid) |
10876 | mpz_clear(ival); | |
0c77715b | 10877 | if (lval_valid) |
10878 | mpz_clear(lval); | |
e440a328 | 10879 | |
10880 | // A slice of an array requires an addressable array. A slice of a | |
10881 | // slice is always possible. | |
411eb89e | 10882 | if (this->end_ != NULL && !array_type->is_slice_type()) |
88ec30c8 | 10883 | { |
10884 | if (!this->array_->is_addressable()) | |
8da39c3b | 10885 | this->report_error(_("slice of unaddressable value")); |
88ec30c8 | 10886 | else |
d0a50ed8 | 10887 | { |
10888 | bool escapes = true; | |
10889 | ||
10890 | // When compiling the runtime, a slice operation does not | |
10891 | // cause local variables to escape. When escape analysis | |
10892 | // becomes the default, this should be changed to make it an | |
10893 | // error if we have a slice operation that escapes. | |
10894 | if (gogo->compiling_runtime() && gogo->package_name() == "runtime") | |
10895 | escapes = false; | |
10896 | ||
10897 | this->array_->address_taken(escapes); | |
10898 | } | |
88ec30c8 | 10899 | } |
e440a328 | 10900 | } |
10901 | ||
2c809f8f | 10902 | // Flatten array indexing by using temporary variables for slices and indexes. |
35a54f17 | 10903 | |
10904 | Expression* | |
10905 | Array_index_expression::do_flatten(Gogo*, Named_object*, | |
10906 | Statement_inserter* inserter) | |
10907 | { | |
10908 | Location loc = this->location(); | |
5bf8be8b | 10909 | Expression* array = this->array_; |
10910 | Expression* start = this->start_; | |
10911 | Expression* end = this->end_; | |
10912 | Expression* cap = this->cap_; | |
10913 | if (array->is_error_expression() | |
10914 | || array->type()->is_error_type() | |
10915 | || start->is_error_expression() | |
10916 | || start->type()->is_error_type() | |
10917 | || (end != NULL | |
10918 | && (end->is_error_expression() || end->type()->is_error_type())) | |
10919 | || (cap != NULL | |
10920 | && (cap->is_error_expression() || cap->type()->is_error_type()))) | |
10921 | { | |
10922 | go_assert(saw_errors()); | |
10923 | return Expression::make_error(loc); | |
10924 | } | |
10925 | ||
2c809f8f | 10926 | Temporary_statement* temp; |
5bf8be8b | 10927 | if (array->type()->is_slice_type() && !array->is_variable()) |
35a54f17 | 10928 | { |
5bf8be8b | 10929 | temp = Statement::make_temporary(NULL, array, loc); |
35a54f17 | 10930 | inserter->insert(temp); |
10931 | this->array_ = Expression::make_temporary_reference(temp, loc); | |
10932 | } | |
5bf8be8b | 10933 | if (!start->is_variable()) |
2c809f8f | 10934 | { |
5bf8be8b | 10935 | temp = Statement::make_temporary(NULL, start, loc); |
2c809f8f | 10936 | inserter->insert(temp); |
10937 | this->start_ = Expression::make_temporary_reference(temp, loc); | |
10938 | } | |
5bf8be8b | 10939 | if (end != NULL |
10940 | && !end->is_nil_expression() | |
10941 | && !end->is_variable()) | |
2c809f8f | 10942 | { |
5bf8be8b | 10943 | temp = Statement::make_temporary(NULL, end, loc); |
2c809f8f | 10944 | inserter->insert(temp); |
10945 | this->end_ = Expression::make_temporary_reference(temp, loc); | |
10946 | } | |
03118c21 | 10947 | if (cap != NULL && !cap->is_variable()) |
2c809f8f | 10948 | { |
5bf8be8b | 10949 | temp = Statement::make_temporary(NULL, cap, loc); |
2c809f8f | 10950 | inserter->insert(temp); |
10951 | this->cap_ = Expression::make_temporary_reference(temp, loc); | |
10952 | } | |
10953 | ||
35a54f17 | 10954 | return this; |
10955 | } | |
10956 | ||
e440a328 | 10957 | // Return whether this expression is addressable. |
10958 | ||
10959 | bool | |
10960 | Array_index_expression::do_is_addressable() const | |
10961 | { | |
10962 | // A slice expression is not addressable. | |
10963 | if (this->end_ != NULL) | |
10964 | return false; | |
10965 | ||
10966 | // An index into a slice is addressable. | |
411eb89e | 10967 | if (this->array_->type()->is_slice_type()) |
e440a328 | 10968 | return true; |
10969 | ||
10970 | // An index into an array is addressable if the array is | |
10971 | // addressable. | |
10972 | return this->array_->is_addressable(); | |
10973 | } | |
10974 | ||
ea664253 | 10975 | // Get the backend representation for an array index. |
e440a328 | 10976 | |
ea664253 | 10977 | Bexpression* |
10978 | Array_index_expression::do_get_backend(Translate_context* context) | |
e440a328 | 10979 | { |
e440a328 | 10980 | Array_type* array_type = this->array_->type()->array_type(); |
d8cd8e2d | 10981 | if (array_type == NULL) |
10982 | { | |
c484d925 | 10983 | go_assert(this->array_->type()->is_error()); |
ea664253 | 10984 | return context->backend()->error_expression(); |
d8cd8e2d | 10985 | } |
35a54f17 | 10986 | go_assert(!array_type->is_slice_type() || this->array_->is_variable()); |
e440a328 | 10987 | |
2c809f8f | 10988 | Location loc = this->location(); |
10989 | Gogo* gogo = context->gogo(); | |
10990 | ||
6dfedc16 | 10991 | Type* int_type = Type::lookup_integer_type("int"); |
10992 | Btype* int_btype = int_type->get_backend(gogo); | |
e440a328 | 10993 | |
2c809f8f | 10994 | // We need to convert the length and capacity to the Go "int" type here |
10995 | // because the length of a fixed-length array could be of type "uintptr" | |
10996 | // and gimple disallows binary operations between "uintptr" and other | |
10997 | // integer types. FIXME. | |
10998 | Bexpression* length = NULL; | |
a04bfdfc | 10999 | if (this->end_ == NULL || this->end_->is_nil_expression()) |
11000 | { | |
35a54f17 | 11001 | Expression* len = array_type->get_length(gogo, this->array_); |
ea664253 | 11002 | length = len->get_backend(context); |
2c809f8f | 11003 | length = gogo->backend()->convert_expression(int_btype, length, loc); |
a04bfdfc | 11004 | } |
11005 | ||
2c809f8f | 11006 | Bexpression* capacity = NULL; |
a04bfdfc | 11007 | if (this->end_ != NULL) |
11008 | { | |
35a54f17 | 11009 | Expression* cap = array_type->get_capacity(gogo, this->array_); |
ea664253 | 11010 | capacity = cap->get_backend(context); |
2c809f8f | 11011 | capacity = gogo->backend()->convert_expression(int_btype, capacity, loc); |
a04bfdfc | 11012 | } |
11013 | ||
2c809f8f | 11014 | Bexpression* cap_arg = capacity; |
acf2b673 | 11015 | if (this->cap_ != NULL) |
11016 | { | |
ea664253 | 11017 | cap_arg = this->cap_->get_backend(context); |
2c809f8f | 11018 | cap_arg = gogo->backend()->convert_expression(int_btype, cap_arg, loc); |
acf2b673 | 11019 | } |
11020 | ||
2c809f8f | 11021 | if (length == NULL) |
11022 | length = cap_arg; | |
e440a328 | 11023 | |
11024 | int code = (array_type->length() != NULL | |
11025 | ? (this->end_ == NULL | |
11026 | ? RUNTIME_ERROR_ARRAY_INDEX_OUT_OF_BOUNDS | |
11027 | : RUNTIME_ERROR_ARRAY_SLICE_OUT_OF_BOUNDS) | |
11028 | : (this->end_ == NULL | |
11029 | ? RUNTIME_ERROR_SLICE_INDEX_OUT_OF_BOUNDS | |
11030 | : RUNTIME_ERROR_SLICE_SLICE_OUT_OF_BOUNDS)); | |
ea664253 | 11031 | Bexpression* crash = gogo->runtime_error(code, loc)->get_backend(context); |
2c809f8f | 11032 | |
6dfedc16 | 11033 | if (this->start_->type()->integer_type() == NULL |
11034 | && !Type::are_convertible(int_type, this->start_->type(), NULL)) | |
11035 | { | |
11036 | go_assert(saw_errors()); | |
11037 | return context->backend()->error_expression(); | |
11038 | } | |
d9f3743a | 11039 | |
ea664253 | 11040 | Bexpression* bad_index = |
d9f3743a | 11041 | Expression::check_bounds(this->start_, loc)->get_backend(context); |
2c809f8f | 11042 | |
ea664253 | 11043 | Bexpression* start = this->start_->get_backend(context); |
2c809f8f | 11044 | start = gogo->backend()->convert_expression(int_btype, start, loc); |
11045 | Bexpression* start_too_large = | |
11046 | gogo->backend()->binary_expression((this->end_ == NULL | |
11047 | ? OPERATOR_GE | |
11048 | : OPERATOR_GT), | |
11049 | start, | |
11050 | (this->end_ == NULL | |
11051 | ? length | |
11052 | : capacity), | |
11053 | loc); | |
11054 | bad_index = gogo->backend()->binary_expression(OPERATOR_OROR, start_too_large, | |
11055 | bad_index, loc); | |
e440a328 | 11056 | |
93715b75 | 11057 | Bfunction* bfn = context->function()->func_value()->get_decl(); |
e440a328 | 11058 | if (this->end_ == NULL) |
11059 | { | |
11060 | // Simple array indexing. This has to return an l-value, so | |
2c809f8f | 11061 | // wrap the index check into START. |
11062 | start = | |
93715b75 | 11063 | gogo->backend()->conditional_expression(bfn, int_btype, bad_index, |
2c809f8f | 11064 | crash, start, loc); |
e440a328 | 11065 | |
2c809f8f | 11066 | Bexpression* ret; |
e440a328 | 11067 | if (array_type->length() != NULL) |
11068 | { | |
ea664253 | 11069 | Bexpression* array = this->array_->get_backend(context); |
2c809f8f | 11070 | ret = gogo->backend()->array_index_expression(array, start, loc); |
e440a328 | 11071 | } |
11072 | else | |
11073 | { | |
2c809f8f | 11074 | // Slice. |
11075 | Expression* valptr = | |
44dbe1d7 | 11076 | array_type->get_value_pointer(gogo, this->array_, |
11077 | this->is_lvalue_); | |
ea664253 | 11078 | Bexpression* ptr = valptr->get_backend(context); |
2c809f8f | 11079 | ptr = gogo->backend()->pointer_offset_expression(ptr, start, loc); |
9b27b43c | 11080 | |
11081 | Type* ele_type = this->array_->type()->array_type()->element_type(); | |
11082 | Btype* ele_btype = ele_type->get_backend(gogo); | |
11083 | ret = gogo->backend()->indirect_expression(ele_btype, ptr, true, loc); | |
e440a328 | 11084 | } |
ea664253 | 11085 | return ret; |
e440a328 | 11086 | } |
11087 | ||
11088 | // Array slice. | |
11089 | ||
acf2b673 | 11090 | if (this->cap_ != NULL) |
11091 | { | |
2c809f8f | 11092 | Bexpression* bounds_bcheck = |
ea664253 | 11093 | Expression::check_bounds(this->cap_, loc)->get_backend(context); |
2c809f8f | 11094 | bad_index = |
11095 | gogo->backend()->binary_expression(OPERATOR_OROR, bounds_bcheck, | |
11096 | bad_index, loc); | |
11097 | cap_arg = gogo->backend()->convert_expression(int_btype, cap_arg, loc); | |
11098 | ||
11099 | Bexpression* cap_too_small = | |
11100 | gogo->backend()->binary_expression(OPERATOR_LT, cap_arg, start, loc); | |
11101 | Bexpression* cap_too_large = | |
11102 | gogo->backend()->binary_expression(OPERATOR_GT, cap_arg, capacity, loc); | |
11103 | Bexpression* bad_cap = | |
11104 | gogo->backend()->binary_expression(OPERATOR_OROR, cap_too_small, | |
11105 | cap_too_large, loc); | |
11106 | bad_index = gogo->backend()->binary_expression(OPERATOR_OROR, bad_cap, | |
11107 | bad_index, loc); | |
11108 | } | |
11109 | ||
11110 | Bexpression* end; | |
e440a328 | 11111 | if (this->end_->is_nil_expression()) |
2c809f8f | 11112 | end = length; |
e440a328 | 11113 | else |
11114 | { | |
2c809f8f | 11115 | Bexpression* bounds_bcheck = |
ea664253 | 11116 | Expression::check_bounds(this->end_, loc)->get_backend(context); |
e440a328 | 11117 | |
2c809f8f | 11118 | bad_index = |
11119 | gogo->backend()->binary_expression(OPERATOR_OROR, bounds_bcheck, | |
11120 | bad_index, loc); | |
e440a328 | 11121 | |
ea664253 | 11122 | end = this->end_->get_backend(context); |
2c809f8f | 11123 | end = gogo->backend()->convert_expression(int_btype, end, loc); |
11124 | Bexpression* end_too_small = | |
11125 | gogo->backend()->binary_expression(OPERATOR_LT, end, start, loc); | |
11126 | Bexpression* end_too_large = | |
11127 | gogo->backend()->binary_expression(OPERATOR_GT, end, cap_arg, loc); | |
11128 | Bexpression* bad_end = | |
11129 | gogo->backend()->binary_expression(OPERATOR_OROR, end_too_small, | |
11130 | end_too_large, loc); | |
11131 | bad_index = gogo->backend()->binary_expression(OPERATOR_OROR, bad_end, | |
11132 | bad_index, loc); | |
e440a328 | 11133 | } |
11134 | ||
2c809f8f | 11135 | Bexpression* result_length = |
11136 | gogo->backend()->binary_expression(OPERATOR_MINUS, end, start, loc); | |
e440a328 | 11137 | |
2c809f8f | 11138 | Bexpression* result_capacity = |
11139 | gogo->backend()->binary_expression(OPERATOR_MINUS, cap_arg, start, loc); | |
e440a328 | 11140 | |
03118c21 | 11141 | // If the new capacity is zero, don't change val. Otherwise we can |
11142 | // get a pointer to the next object in memory, keeping it live | |
11143 | // unnecessarily. When the capacity is zero, the actual pointer | |
11144 | // value doesn't matter. | |
11145 | Bexpression* zero = | |
11146 | Expression::make_integer_ul(0, int_type, loc)->get_backend(context); | |
11147 | Bexpression* cond = | |
11148 | gogo->backend()->binary_expression(OPERATOR_EQEQ, result_capacity, zero, | |
11149 | loc); | |
11150 | Bexpression* offset = gogo->backend()->conditional_expression(bfn, int_btype, | |
11151 | cond, zero, | |
11152 | start, loc); | |
44dbe1d7 | 11153 | Expression* valptr = array_type->get_value_pointer(gogo, this->array_, |
11154 | this->is_lvalue_); | |
03118c21 | 11155 | Bexpression* val = valptr->get_backend(context); |
11156 | val = gogo->backend()->pointer_offset_expression(val, offset, loc); | |
11157 | ||
2c809f8f | 11158 | Btype* struct_btype = this->type()->get_backend(gogo); |
11159 | std::vector<Bexpression*> init; | |
11160 | init.push_back(val); | |
11161 | init.push_back(result_length); | |
11162 | init.push_back(result_capacity); | |
e440a328 | 11163 | |
2c809f8f | 11164 | Bexpression* ctor = |
11165 | gogo->backend()->constructor_expression(struct_btype, init, loc); | |
93715b75 | 11166 | return gogo->backend()->conditional_expression(bfn, struct_btype, bad_index, |
ea664253 | 11167 | crash, ctor, loc); |
e440a328 | 11168 | } |
11169 | ||
d751bb78 | 11170 | // Dump ast representation for an array index expression. |
11171 | ||
11172 | void | |
11173 | Array_index_expression::do_dump_expression(Ast_dump_context* ast_dump_context) | |
11174 | const | |
11175 | { | |
11176 | Index_expression::dump_index_expression(ast_dump_context, this->array_, | |
acf2b673 | 11177 | this->start_, this->end_, this->cap_); |
d751bb78 | 11178 | } |
11179 | ||
acf2b673 | 11180 | // Make an array index expression. END and CAP may be NULL. |
e440a328 | 11181 | |
11182 | Expression* | |
11183 | Expression::make_array_index(Expression* array, Expression* start, | |
acf2b673 | 11184 | Expression* end, Expression* cap, |
11185 | Location location) | |
e440a328 | 11186 | { |
acf2b673 | 11187 | return new Array_index_expression(array, start, end, cap, location); |
e440a328 | 11188 | } |
11189 | ||
50075d74 | 11190 | // Class String_index_expression. |
e440a328 | 11191 | |
11192 | // String index traversal. | |
11193 | ||
11194 | int | |
11195 | String_index_expression::do_traverse(Traverse* traverse) | |
11196 | { | |
11197 | if (Expression::traverse(&this->string_, traverse) == TRAVERSE_EXIT) | |
11198 | return TRAVERSE_EXIT; | |
11199 | if (Expression::traverse(&this->start_, traverse) == TRAVERSE_EXIT) | |
11200 | return TRAVERSE_EXIT; | |
11201 | if (this->end_ != NULL) | |
11202 | { | |
11203 | if (Expression::traverse(&this->end_, traverse) == TRAVERSE_EXIT) | |
11204 | return TRAVERSE_EXIT; | |
11205 | } | |
11206 | return TRAVERSE_CONTINUE; | |
11207 | } | |
11208 | ||
2c809f8f | 11209 | Expression* |
11210 | String_index_expression::do_flatten(Gogo*, Named_object*, | |
11211 | Statement_inserter* inserter) | |
e440a328 | 11212 | { |
2c809f8f | 11213 | Location loc = this->location(); |
5bf8be8b | 11214 | Expression* string = this->string_; |
11215 | Expression* start = this->start_; | |
11216 | Expression* end = this->end_; | |
11217 | if (string->is_error_expression() | |
11218 | || string->type()->is_error_type() | |
11219 | || start->is_error_expression() | |
11220 | || start->type()->is_error_type() | |
11221 | || (end != NULL | |
11222 | && (end->is_error_expression() || end->type()->is_error_type()))) | |
11223 | { | |
11224 | go_assert(saw_errors()); | |
11225 | return Expression::make_error(loc); | |
11226 | } | |
11227 | ||
11228 | Temporary_statement* temp; | |
2c809f8f | 11229 | if (!this->string_->is_variable()) |
11230 | { | |
11231 | temp = Statement::make_temporary(NULL, this->string_, loc); | |
11232 | inserter->insert(temp); | |
11233 | this->string_ = Expression::make_temporary_reference(temp, loc); | |
11234 | } | |
11235 | if (!this->start_->is_variable()) | |
11236 | { | |
11237 | temp = Statement::make_temporary(NULL, this->start_, loc); | |
11238 | inserter->insert(temp); | |
11239 | this->start_ = Expression::make_temporary_reference(temp, loc); | |
11240 | } | |
11241 | if (this->end_ != NULL | |
11242 | && !this->end_->is_nil_expression() | |
11243 | && !this->end_->is_variable()) | |
11244 | { | |
11245 | temp = Statement::make_temporary(NULL, this->end_, loc); | |
11246 | inserter->insert(temp); | |
11247 | this->end_ = Expression::make_temporary_reference(temp, loc); | |
11248 | } | |
11249 | ||
11250 | return this; | |
11251 | } | |
11252 | ||
11253 | // Return the type of a string index. | |
11254 | ||
11255 | Type* | |
11256 | String_index_expression::do_type() | |
11257 | { | |
11258 | if (this->end_ == NULL) | |
11259 | return Type::lookup_integer_type("uint8"); | |
11260 | else | |
11261 | return this->string_->type(); | |
11262 | } | |
11263 | ||
11264 | // Determine the type of a string index. | |
11265 | ||
11266 | void | |
11267 | String_index_expression::do_determine_type(const Type_context*) | |
11268 | { | |
11269 | this->string_->determine_type_no_context(); | |
f77aa642 | 11270 | |
11271 | Type_context index_context(Type::lookup_integer_type("int"), false); | |
11272 | if (this->start_->is_constant()) | |
11273 | this->start_->determine_type(&index_context); | |
11274 | else | |
11275 | this->start_->determine_type_no_context(); | |
e440a328 | 11276 | if (this->end_ != NULL) |
f77aa642 | 11277 | { |
11278 | if (this->end_->is_constant()) | |
11279 | this->end_->determine_type(&index_context); | |
11280 | else | |
11281 | this->end_->determine_type_no_context(); | |
11282 | } | |
e440a328 | 11283 | } |
11284 | ||
11285 | // Check types of a string index. | |
11286 | ||
11287 | void | |
11288 | String_index_expression::do_check_types(Gogo*) | |
11289 | { | |
acdc230d | 11290 | Numeric_constant nc; |
11291 | unsigned long v; | |
11292 | if (this->start_->type()->integer_type() == NULL | |
11293 | && !this->start_->type()->is_error() | |
11294 | && (!this->start_->numeric_constant_value(&nc) | |
11295 | || nc.to_unsigned_long(&v) == Numeric_constant::NC_UL_NOTINT)) | |
e440a328 | 11296 | this->report_error(_("index must be integer")); |
11297 | if (this->end_ != NULL | |
11298 | && this->end_->type()->integer_type() == NULL | |
acdc230d | 11299 | && !this->end_->type()->is_error() |
11300 | && !this->end_->is_nil_expression() | |
11301 | && !this->end_->is_error_expression() | |
11302 | && (!this->end_->numeric_constant_value(&nc) | |
11303 | || nc.to_unsigned_long(&v) == Numeric_constant::NC_UL_NOTINT)) | |
e440a328 | 11304 | this->report_error(_("slice end must be integer")); |
11305 | ||
11306 | std::string sval; | |
11307 | bool sval_valid = this->string_->string_constant_value(&sval); | |
11308 | ||
0c77715b | 11309 | Numeric_constant inc; |
e440a328 | 11310 | mpz_t ival; |
0bd5d859 | 11311 | bool ival_valid = false; |
0c77715b | 11312 | if (this->start_->numeric_constant_value(&inc) && inc.to_int(&ival)) |
e440a328 | 11313 | { |
0bd5d859 | 11314 | ival_valid = true; |
e440a328 | 11315 | if (mpz_sgn(ival) < 0 |
b10f32fb | 11316 | || (sval_valid |
11317 | && (this->end_ == NULL | |
11318 | ? mpz_cmp_ui(ival, sval.length()) >= 0 | |
11319 | : mpz_cmp_ui(ival, sval.length()) > 0))) | |
e440a328 | 11320 | { |
631d5788 | 11321 | go_error_at(this->start_->location(), "string index out of bounds"); |
e440a328 | 11322 | this->set_is_error(); |
11323 | } | |
11324 | } | |
11325 | if (this->end_ != NULL && !this->end_->is_nil_expression()) | |
11326 | { | |
0c77715b | 11327 | Numeric_constant enc; |
11328 | mpz_t eval; | |
11329 | if (this->end_->numeric_constant_value(&enc) && enc.to_int(&eval)) | |
e440a328 | 11330 | { |
0c77715b | 11331 | if (mpz_sgn(eval) < 0 |
11332 | || (sval_valid && mpz_cmp_ui(eval, sval.length()) > 0)) | |
e440a328 | 11333 | { |
631d5788 | 11334 | go_error_at(this->end_->location(), "string index out of bounds"); |
e440a328 | 11335 | this->set_is_error(); |
11336 | } | |
0bd5d859 | 11337 | else if (ival_valid && mpz_cmp(ival, eval) > 0) |
11338 | this->report_error(_("inverted slice range")); | |
0c77715b | 11339 | mpz_clear(eval); |
e440a328 | 11340 | } |
11341 | } | |
0bd5d859 | 11342 | if (ival_valid) |
11343 | mpz_clear(ival); | |
e440a328 | 11344 | } |
11345 | ||
ea664253 | 11346 | // Get the backend representation for a string index. |
e440a328 | 11347 | |
ea664253 | 11348 | Bexpression* |
11349 | String_index_expression::do_get_backend(Translate_context* context) | |
e440a328 | 11350 | { |
b13c66cd | 11351 | Location loc = this->location(); |
2c809f8f | 11352 | Expression* string_arg = this->string_; |
11353 | if (this->string_->type()->points_to() != NULL) | |
11354 | string_arg = Expression::make_unary(OPERATOR_MULT, this->string_, loc); | |
e440a328 | 11355 | |
2c809f8f | 11356 | Expression* bad_index = Expression::check_bounds(this->start_, loc); |
e440a328 | 11357 | |
2c809f8f | 11358 | int code = (this->end_ == NULL |
11359 | ? RUNTIME_ERROR_STRING_INDEX_OUT_OF_BOUNDS | |
11360 | : RUNTIME_ERROR_STRING_SLICE_OUT_OF_BOUNDS); | |
e440a328 | 11361 | |
2c809f8f | 11362 | Gogo* gogo = context->gogo(); |
ea664253 | 11363 | Bexpression* crash = gogo->runtime_error(code, loc)->get_backend(context); |
1b1f2abf | 11364 | |
11365 | Type* int_type = Type::lookup_integer_type("int"); | |
e440a328 | 11366 | |
2c809f8f | 11367 | // It is possible that an error occurred earlier because the start index |
11368 | // cannot be represented as an integer type. In this case, we shouldn't | |
11369 | // try casting the starting index into an integer since | |
11370 | // Type_conversion_expression will fail to get the backend representation. | |
11371 | // FIXME. | |
11372 | if (this->start_->type()->integer_type() == NULL | |
11373 | && !Type::are_convertible(int_type, this->start_->type(), NULL)) | |
11374 | { | |
11375 | go_assert(saw_errors()); | |
ea664253 | 11376 | return context->backend()->error_expression(); |
2c809f8f | 11377 | } |
e440a328 | 11378 | |
2c809f8f | 11379 | Expression* start = Expression::make_cast(int_type, this->start_, loc); |
93715b75 | 11380 | Bfunction* bfn = context->function()->func_value()->get_decl(); |
e440a328 | 11381 | |
2c809f8f | 11382 | if (this->end_ == NULL) |
11383 | { | |
11384 | Expression* length = | |
11385 | Expression::make_string_info(this->string_, STRING_INFO_LENGTH, loc); | |
e440a328 | 11386 | |
2c809f8f | 11387 | Expression* start_too_large = |
11388 | Expression::make_binary(OPERATOR_GE, start, length, loc); | |
11389 | bad_index = Expression::make_binary(OPERATOR_OROR, start_too_large, | |
11390 | bad_index, loc); | |
11391 | Expression* bytes = | |
11392 | Expression::make_string_info(this->string_, STRING_INFO_DATA, loc); | |
e440a328 | 11393 | |
ea664253 | 11394 | Bexpression* bstart = start->get_backend(context); |
11395 | Bexpression* ptr = bytes->get_backend(context); | |
2c809f8f | 11396 | ptr = gogo->backend()->pointer_offset_expression(ptr, bstart, loc); |
9b27b43c | 11397 | Btype* ubtype = Type::lookup_integer_type("uint8")->get_backend(gogo); |
11398 | Bexpression* index = | |
11399 | gogo->backend()->indirect_expression(ubtype, ptr, true, loc); | |
e440a328 | 11400 | |
2c809f8f | 11401 | Btype* byte_btype = bytes->type()->points_to()->get_backend(gogo); |
ea664253 | 11402 | Bexpression* index_error = bad_index->get_backend(context); |
93715b75 | 11403 | return gogo->backend()->conditional_expression(bfn, byte_btype, |
11404 | index_error, crash, | |
11405 | index, loc); | |
2c809f8f | 11406 | } |
11407 | ||
11408 | Expression* end = NULL; | |
11409 | if (this->end_->is_nil_expression()) | |
e67508fa | 11410 | end = Expression::make_integer_sl(-1, int_type, loc); |
e440a328 | 11411 | else |
11412 | { | |
2c809f8f | 11413 | Expression* bounds_check = Expression::check_bounds(this->end_, loc); |
11414 | bad_index = | |
11415 | Expression::make_binary(OPERATOR_OROR, bounds_check, bad_index, loc); | |
11416 | end = Expression::make_cast(int_type, this->end_, loc); | |
e440a328 | 11417 | } |
2c809f8f | 11418 | |
11419 | Expression* strslice = Runtime::make_call(Runtime::STRING_SLICE, loc, 3, | |
11420 | string_arg, start, end); | |
ea664253 | 11421 | Bexpression* bstrslice = strslice->get_backend(context); |
2c809f8f | 11422 | |
11423 | Btype* str_btype = strslice->type()->get_backend(gogo); | |
ea664253 | 11424 | Bexpression* index_error = bad_index->get_backend(context); |
93715b75 | 11425 | return gogo->backend()->conditional_expression(bfn, str_btype, index_error, |
ea664253 | 11426 | crash, bstrslice, loc); |
e440a328 | 11427 | } |
11428 | ||
d751bb78 | 11429 | // Dump ast representation for a string index expression. |
11430 | ||
11431 | void | |
11432 | String_index_expression::do_dump_expression(Ast_dump_context* ast_dump_context) | |
11433 | const | |
11434 | { | |
acf2b673 | 11435 | Index_expression::dump_index_expression(ast_dump_context, this->string_, |
11436 | this->start_, this->end_, NULL); | |
d751bb78 | 11437 | } |
11438 | ||
e440a328 | 11439 | // Make a string index expression. END may be NULL. |
11440 | ||
11441 | Expression* | |
11442 | Expression::make_string_index(Expression* string, Expression* start, | |
b13c66cd | 11443 | Expression* end, Location location) |
e440a328 | 11444 | { |
11445 | return new String_index_expression(string, start, end, location); | |
11446 | } | |
11447 | ||
11448 | // Class Map_index. | |
11449 | ||
11450 | // Get the type of the map. | |
11451 | ||
11452 | Map_type* | |
11453 | Map_index_expression::get_map_type() const | |
11454 | { | |
0d5530d9 | 11455 | Map_type* mt = this->map_->type()->map_type(); |
c7524fae | 11456 | if (mt == NULL) |
c484d925 | 11457 | go_assert(saw_errors()); |
e440a328 | 11458 | return mt; |
11459 | } | |
11460 | ||
11461 | // Map index traversal. | |
11462 | ||
11463 | int | |
11464 | Map_index_expression::do_traverse(Traverse* traverse) | |
11465 | { | |
11466 | if (Expression::traverse(&this->map_, traverse) == TRAVERSE_EXIT) | |
11467 | return TRAVERSE_EXIT; | |
11468 | return Expression::traverse(&this->index_, traverse); | |
11469 | } | |
11470 | ||
2c809f8f | 11471 | // We need to pass in a pointer to the key, so flatten the index into a |
11472 | // temporary variable if it isn't already. The value pointer will be | |
11473 | // dereferenced and checked for nil, so flatten into a temporary to avoid | |
11474 | // recomputation. | |
11475 | ||
11476 | Expression* | |
91c0fd76 | 11477 | Map_index_expression::do_flatten(Gogo* gogo, Named_object*, |
2c809f8f | 11478 | Statement_inserter* inserter) |
11479 | { | |
91c0fd76 | 11480 | Location loc = this->location(); |
2c809f8f | 11481 | Map_type* mt = this->get_map_type(); |
5bf8be8b | 11482 | if (this->index()->is_error_expression() |
11483 | || this->index()->type()->is_error_type() | |
11484 | || mt->is_error_type()) | |
11485 | { | |
11486 | go_assert(saw_errors()); | |
11487 | return Expression::make_error(loc); | |
11488 | } | |
11489 | ||
91c0fd76 | 11490 | if (!Type::are_identical(mt->key_type(), this->index_->type(), false, NULL)) |
11491 | { | |
11492 | if (this->index_->type()->interface_type() != NULL | |
11493 | && !this->index_->is_variable()) | |
11494 | { | |
11495 | Temporary_statement* temp = | |
11496 | Statement::make_temporary(NULL, this->index_, loc); | |
11497 | inserter->insert(temp); | |
11498 | this->index_ = Expression::make_temporary_reference(temp, loc); | |
11499 | } | |
11500 | this->index_ = Expression::convert_for_assignment(gogo, mt->key_type(), | |
11501 | this->index_, loc); | |
11502 | } | |
2c809f8f | 11503 | |
11504 | if (!this->index_->is_variable()) | |
11505 | { | |
11506 | Temporary_statement* temp = Statement::make_temporary(NULL, this->index_, | |
91c0fd76 | 11507 | loc); |
2c809f8f | 11508 | inserter->insert(temp); |
91c0fd76 | 11509 | this->index_ = Expression::make_temporary_reference(temp, loc); |
2c809f8f | 11510 | } |
11511 | ||
11512 | if (this->value_pointer_ == NULL) | |
0d5530d9 | 11513 | this->get_value_pointer(gogo); |
5bf8be8b | 11514 | if (this->value_pointer_->is_error_expression() |
11515 | || this->value_pointer_->type()->is_error_type()) | |
11516 | return Expression::make_error(loc); | |
2c809f8f | 11517 | if (!this->value_pointer_->is_variable()) |
11518 | { | |
11519 | Temporary_statement* temp = | |
91c0fd76 | 11520 | Statement::make_temporary(NULL, this->value_pointer_, loc); |
2c809f8f | 11521 | inserter->insert(temp); |
91c0fd76 | 11522 | this->value_pointer_ = Expression::make_temporary_reference(temp, loc); |
2c809f8f | 11523 | } |
11524 | ||
11525 | return this; | |
11526 | } | |
11527 | ||
e440a328 | 11528 | // Return the type of a map index. |
11529 | ||
11530 | Type* | |
11531 | Map_index_expression::do_type() | |
11532 | { | |
c7524fae | 11533 | Map_type* mt = this->get_map_type(); |
11534 | if (mt == NULL) | |
11535 | return Type::make_error_type(); | |
0d5530d9 | 11536 | return mt->val_type(); |
e440a328 | 11537 | } |
11538 | ||
11539 | // Fix the type of a map index. | |
11540 | ||
11541 | void | |
11542 | Map_index_expression::do_determine_type(const Type_context*) | |
11543 | { | |
11544 | this->map_->determine_type_no_context(); | |
c7524fae | 11545 | Map_type* mt = this->get_map_type(); |
11546 | Type* key_type = mt == NULL ? NULL : mt->key_type(); | |
11547 | Type_context subcontext(key_type, false); | |
e440a328 | 11548 | this->index_->determine_type(&subcontext); |
11549 | } | |
11550 | ||
11551 | // Check types of a map index. | |
11552 | ||
11553 | void | |
11554 | Map_index_expression::do_check_types(Gogo*) | |
11555 | { | |
11556 | std::string reason; | |
c7524fae | 11557 | Map_type* mt = this->get_map_type(); |
11558 | if (mt == NULL) | |
11559 | return; | |
11560 | if (!Type::are_assignable(mt->key_type(), this->index_->type(), &reason)) | |
e440a328 | 11561 | { |
11562 | if (reason.empty()) | |
11563 | this->report_error(_("incompatible type for map index")); | |
11564 | else | |
11565 | { | |
631d5788 | 11566 | go_error_at(this->location(), "incompatible type for map index (%s)", |
11567 | reason.c_str()); | |
e440a328 | 11568 | this->set_is_error(); |
11569 | } | |
11570 | } | |
11571 | } | |
11572 | ||
ea664253 | 11573 | // Get the backend representation for a map index. |
e440a328 | 11574 | |
ea664253 | 11575 | Bexpression* |
11576 | Map_index_expression::do_get_backend(Translate_context* context) | |
e440a328 | 11577 | { |
11578 | Map_type* type = this->get_map_type(); | |
c7524fae | 11579 | if (type == NULL) |
2c809f8f | 11580 | { |
11581 | go_assert(saw_errors()); | |
ea664253 | 11582 | return context->backend()->error_expression(); |
2c809f8f | 11583 | } |
e440a328 | 11584 | |
2c809f8f | 11585 | go_assert(this->value_pointer_ != NULL |
11586 | && this->value_pointer_->is_variable()); | |
e440a328 | 11587 | |
0d5530d9 | 11588 | Expression* val = Expression::make_unary(OPERATOR_MULT, this->value_pointer_, |
11589 | this->location()); | |
11590 | return val->get_backend(context); | |
e440a328 | 11591 | } |
11592 | ||
0d5530d9 | 11593 | // Get an expression for the map index. This returns an expression |
11594 | // that evaluates to a pointer to a value. If the key is not in the | |
11595 | // map, the pointer will point to a zero value. | |
e440a328 | 11596 | |
2c809f8f | 11597 | Expression* |
0d5530d9 | 11598 | Map_index_expression::get_value_pointer(Gogo* gogo) |
e440a328 | 11599 | { |
2c809f8f | 11600 | if (this->value_pointer_ == NULL) |
746d2e73 | 11601 | { |
2c809f8f | 11602 | Map_type* type = this->get_map_type(); |
11603 | if (type == NULL) | |
746d2e73 | 11604 | { |
2c809f8f | 11605 | go_assert(saw_errors()); |
11606 | return Expression::make_error(this->location()); | |
746d2e73 | 11607 | } |
e440a328 | 11608 | |
2c809f8f | 11609 | Location loc = this->location(); |
11610 | Expression* map_ref = this->map_; | |
e440a328 | 11611 | |
0d5530d9 | 11612 | Expression* index_ptr = Expression::make_unary(OPERATOR_AND, |
11613 | this->index_, | |
2c809f8f | 11614 | loc); |
0d5530d9 | 11615 | |
11616 | Expression* zero = type->fat_zero_value(gogo); | |
11617 | ||
11618 | Expression* map_index; | |
11619 | ||
11620 | if (zero == NULL) | |
11621 | map_index = | |
11622 | Runtime::make_call(Runtime::MAPACCESS1, loc, 3, | |
11623 | Expression::make_type_descriptor(type, loc), | |
11624 | map_ref, index_ptr); | |
11625 | else | |
11626 | map_index = | |
11627 | Runtime::make_call(Runtime::MAPACCESS1_FAT, loc, 4, | |
11628 | Expression::make_type_descriptor(type, loc), | |
11629 | map_ref, index_ptr, zero); | |
2c809f8f | 11630 | |
11631 | Type* val_type = type->val_type(); | |
11632 | this->value_pointer_ = | |
11633 | Expression::make_unsafe_cast(Type::make_pointer_type(val_type), | |
11634 | map_index, this->location()); | |
11635 | } | |
0d5530d9 | 11636 | |
2c809f8f | 11637 | return this->value_pointer_; |
e440a328 | 11638 | } |
11639 | ||
d751bb78 | 11640 | // Dump ast representation for a map index expression |
11641 | ||
11642 | void | |
11643 | Map_index_expression::do_dump_expression(Ast_dump_context* ast_dump_context) | |
11644 | const | |
11645 | { | |
acf2b673 | 11646 | Index_expression::dump_index_expression(ast_dump_context, this->map_, |
11647 | this->index_, NULL, NULL); | |
d751bb78 | 11648 | } |
11649 | ||
e440a328 | 11650 | // Make a map index expression. |
11651 | ||
11652 | Map_index_expression* | |
11653 | Expression::make_map_index(Expression* map, Expression* index, | |
b13c66cd | 11654 | Location location) |
e440a328 | 11655 | { |
11656 | return new Map_index_expression(map, index, location); | |
11657 | } | |
11658 | ||
11659 | // Class Field_reference_expression. | |
11660 | ||
149eabc5 | 11661 | // Lower a field reference expression. There is nothing to lower, but |
11662 | // this is where we generate the tracking information for fields with | |
11663 | // the magic go:"track" tag. | |
11664 | ||
11665 | Expression* | |
11666 | Field_reference_expression::do_lower(Gogo* gogo, Named_object* function, | |
11667 | Statement_inserter* inserter, int) | |
11668 | { | |
11669 | Struct_type* struct_type = this->expr_->type()->struct_type(); | |
11670 | if (struct_type == NULL) | |
11671 | { | |
11672 | // Error will be reported elsewhere. | |
11673 | return this; | |
11674 | } | |
11675 | const Struct_field* field = struct_type->field(this->field_index_); | |
11676 | if (field == NULL) | |
11677 | return this; | |
11678 | if (!field->has_tag()) | |
11679 | return this; | |
11680 | if (field->tag().find("go:\"track\"") == std::string::npos) | |
11681 | return this; | |
11682 | ||
604e278d | 11683 | // References from functions generated by the compiler don't count. |
c6292d1d | 11684 | if (function != NULL && function->func_value()->is_type_specific_function()) |
604e278d | 11685 | return this; |
11686 | ||
149eabc5 | 11687 | // We have found a reference to a tracked field. Build a call to |
11688 | // the runtime function __go_fieldtrack with a string that describes | |
11689 | // the field. FIXME: We should only call this once per referenced | |
11690 | // field per function, not once for each reference to the field. | |
11691 | ||
11692 | if (this->called_fieldtrack_) | |
11693 | return this; | |
11694 | this->called_fieldtrack_ = true; | |
11695 | ||
11696 | Location loc = this->location(); | |
11697 | ||
11698 | std::string s = "fieldtrack \""; | |
11699 | Named_type* nt = this->expr_->type()->named_type(); | |
11700 | if (nt == NULL || nt->named_object()->package() == NULL) | |
11701 | s.append(gogo->pkgpath()); | |
11702 | else | |
11703 | s.append(nt->named_object()->package()->pkgpath()); | |
11704 | s.push_back('.'); | |
11705 | if (nt != NULL) | |
5c29ad36 | 11706 | s.append(Gogo::unpack_hidden_name(nt->name())); |
149eabc5 | 11707 | s.push_back('.'); |
11708 | s.append(field->field_name()); | |
11709 | s.push_back('"'); | |
11710 | ||
11711 | // We can't use a string here, because internally a string holds a | |
11712 | // pointer to the actual bytes; when the linker garbage collects the | |
11713 | // string, it won't garbage collect the bytes. So we use a | |
11714 | // [...]byte. | |
11715 | ||
e67508fa | 11716 | Expression* length_expr = Expression::make_integer_ul(s.length(), NULL, loc); |
149eabc5 | 11717 | |
11718 | Type* byte_type = gogo->lookup_global("byte")->type_value(); | |
6bf4793c | 11719 | Array_type* array_type = Type::make_array_type(byte_type, length_expr); |
11720 | array_type->set_is_array_incomparable(); | |
149eabc5 | 11721 | |
11722 | Expression_list* bytes = new Expression_list(); | |
11723 | for (std::string::const_iterator p = s.begin(); p != s.end(); p++) | |
11724 | { | |
e67508fa | 11725 | unsigned char c = static_cast<unsigned char>(*p); |
11726 | bytes->push_back(Expression::make_integer_ul(c, NULL, loc)); | |
149eabc5 | 11727 | } |
11728 | ||
11729 | Expression* e = Expression::make_composite_literal(array_type, 0, false, | |
62750cd5 | 11730 | bytes, false, loc); |
149eabc5 | 11731 | |
11732 | Variable* var = new Variable(array_type, e, true, false, false, loc); | |
11733 | ||
11734 | static int count; | |
11735 | char buf[50]; | |
11736 | snprintf(buf, sizeof buf, "fieldtrack.%d", count); | |
11737 | ++count; | |
11738 | ||
11739 | Named_object* no = gogo->add_variable(buf, var); | |
11740 | e = Expression::make_var_reference(no, loc); | |
11741 | e = Expression::make_unary(OPERATOR_AND, e, loc); | |
11742 | ||
11743 | Expression* call = Runtime::make_call(Runtime::FIELDTRACK, loc, 1, e); | |
604e278d | 11744 | gogo->lower_expression(function, inserter, &call); |
149eabc5 | 11745 | inserter->insert(Statement::make_statement(call, false)); |
11746 | ||
11747 | // Put this function, and the global variable we just created, into | |
11748 | // unique sections. This will permit the linker to garbage collect | |
11749 | // them if they are not referenced. The effect is that the only | |
11750 | // strings, indicating field references, that will wind up in the | |
11751 | // executable will be those for functions that are actually needed. | |
66a6be58 | 11752 | if (function != NULL) |
11753 | function->func_value()->set_in_unique_section(); | |
149eabc5 | 11754 | var->set_in_unique_section(); |
11755 | ||
11756 | return this; | |
11757 | } | |
11758 | ||
e440a328 | 11759 | // Return the type of a field reference. |
11760 | ||
11761 | Type* | |
11762 | Field_reference_expression::do_type() | |
11763 | { | |
b0e628fb | 11764 | Type* type = this->expr_->type(); |
5c13bd80 | 11765 | if (type->is_error()) |
b0e628fb | 11766 | return type; |
11767 | Struct_type* struct_type = type->struct_type(); | |
c484d925 | 11768 | go_assert(struct_type != NULL); |
e440a328 | 11769 | return struct_type->field(this->field_index_)->type(); |
11770 | } | |
11771 | ||
11772 | // Check the types for a field reference. | |
11773 | ||
11774 | void | |
11775 | Field_reference_expression::do_check_types(Gogo*) | |
11776 | { | |
b0e628fb | 11777 | Type* type = this->expr_->type(); |
5c13bd80 | 11778 | if (type->is_error()) |
b0e628fb | 11779 | return; |
11780 | Struct_type* struct_type = type->struct_type(); | |
c484d925 | 11781 | go_assert(struct_type != NULL); |
11782 | go_assert(struct_type->field(this->field_index_) != NULL); | |
e440a328 | 11783 | } |
11784 | ||
ea664253 | 11785 | // Get the backend representation for a field reference. |
e440a328 | 11786 | |
ea664253 | 11787 | Bexpression* |
11788 | Field_reference_expression::do_get_backend(Translate_context* context) | |
e440a328 | 11789 | { |
ea664253 | 11790 | Bexpression* bstruct = this->expr_->get_backend(context); |
11791 | return context->gogo()->backend()->struct_field_expression(bstruct, | |
11792 | this->field_index_, | |
11793 | this->location()); | |
e440a328 | 11794 | } |
11795 | ||
d751bb78 | 11796 | // Dump ast representation for a field reference expression. |
11797 | ||
11798 | void | |
11799 | Field_reference_expression::do_dump_expression( | |
11800 | Ast_dump_context* ast_dump_context) const | |
11801 | { | |
11802 | this->expr_->dump_expression(ast_dump_context); | |
11803 | ast_dump_context->ostream() << "." << this->field_index_; | |
11804 | } | |
11805 | ||
e440a328 | 11806 | // Make a reference to a qualified identifier in an expression. |
11807 | ||
11808 | Field_reference_expression* | |
11809 | Expression::make_field_reference(Expression* expr, unsigned int field_index, | |
b13c66cd | 11810 | Location location) |
e440a328 | 11811 | { |
11812 | return new Field_reference_expression(expr, field_index, location); | |
11813 | } | |
11814 | ||
11815 | // Class Interface_field_reference_expression. | |
11816 | ||
2387f644 | 11817 | // Return an expression for the pointer to the function to call. |
e440a328 | 11818 | |
2387f644 | 11819 | Expression* |
11820 | Interface_field_reference_expression::get_function() | |
e440a328 | 11821 | { |
2387f644 | 11822 | Expression* ref = this->expr_; |
11823 | Location loc = this->location(); | |
11824 | if (ref->type()->points_to() != NULL) | |
11825 | ref = Expression::make_unary(OPERATOR_MULT, ref, loc); | |
e440a328 | 11826 | |
2387f644 | 11827 | Expression* mtable = |
11828 | Expression::make_interface_info(ref, INTERFACE_INFO_METHODS, loc); | |
11829 | Struct_type* mtable_type = mtable->type()->points_to()->struct_type(); | |
e440a328 | 11830 | |
11831 | std::string name = Gogo::unpack_hidden_name(this->name_); | |
2387f644 | 11832 | unsigned int index; |
11833 | const Struct_field* field = mtable_type->find_local_field(name, &index); | |
11834 | go_assert(field != NULL); | |
11835 | mtable = Expression::make_unary(OPERATOR_MULT, mtable, loc); | |
11836 | return Expression::make_field_reference(mtable, index, loc); | |
e440a328 | 11837 | } |
11838 | ||
2387f644 | 11839 | // Return an expression for the first argument to pass to the interface |
e440a328 | 11840 | // function. |
11841 | ||
2387f644 | 11842 | Expression* |
11843 | Interface_field_reference_expression::get_underlying_object() | |
e440a328 | 11844 | { |
2387f644 | 11845 | Expression* expr = this->expr_; |
11846 | if (expr->type()->points_to() != NULL) | |
11847 | expr = Expression::make_unary(OPERATOR_MULT, expr, this->location()); | |
11848 | return Expression::make_interface_info(expr, INTERFACE_INFO_OBJECT, | |
11849 | this->location()); | |
e440a328 | 11850 | } |
11851 | ||
11852 | // Traversal. | |
11853 | ||
11854 | int | |
11855 | Interface_field_reference_expression::do_traverse(Traverse* traverse) | |
11856 | { | |
11857 | return Expression::traverse(&this->expr_, traverse); | |
11858 | } | |
11859 | ||
0afbb937 | 11860 | // Lower the expression. If this expression is not called, we need to |
11861 | // evaluate the expression twice when converting to the backend | |
11862 | // interface. So introduce a temporary variable if necessary. | |
11863 | ||
11864 | Expression* | |
9782d556 | 11865 | Interface_field_reference_expression::do_flatten(Gogo*, Named_object*, |
11866 | Statement_inserter* inserter) | |
0afbb937 | 11867 | { |
5bf8be8b | 11868 | if (this->expr_->is_error_expression() |
11869 | || this->expr_->type()->is_error_type()) | |
11870 | { | |
11871 | go_assert(saw_errors()); | |
11872 | return Expression::make_error(this->location()); | |
11873 | } | |
11874 | ||
2387f644 | 11875 | if (!this->expr_->is_variable()) |
0afbb937 | 11876 | { |
11877 | Temporary_statement* temp = | |
11878 | Statement::make_temporary(this->expr_->type(), NULL, this->location()); | |
11879 | inserter->insert(temp); | |
11880 | this->expr_ = Expression::make_set_and_use_temporary(temp, this->expr_, | |
11881 | this->location()); | |
11882 | } | |
11883 | return this; | |
11884 | } | |
11885 | ||
e440a328 | 11886 | // Return the type of an interface field reference. |
11887 | ||
11888 | Type* | |
11889 | Interface_field_reference_expression::do_type() | |
11890 | { | |
11891 | Type* expr_type = this->expr_->type(); | |
11892 | ||
11893 | Type* points_to = expr_type->points_to(); | |
11894 | if (points_to != NULL) | |
11895 | expr_type = points_to; | |
11896 | ||
11897 | Interface_type* interface_type = expr_type->interface_type(); | |
11898 | if (interface_type == NULL) | |
11899 | return Type::make_error_type(); | |
11900 | ||
11901 | const Typed_identifier* method = interface_type->find_method(this->name_); | |
11902 | if (method == NULL) | |
11903 | return Type::make_error_type(); | |
11904 | ||
11905 | return method->type(); | |
11906 | } | |
11907 | ||
11908 | // Determine types. | |
11909 | ||
11910 | void | |
11911 | Interface_field_reference_expression::do_determine_type(const Type_context*) | |
11912 | { | |
11913 | this->expr_->determine_type_no_context(); | |
11914 | } | |
11915 | ||
11916 | // Check the types for an interface field reference. | |
11917 | ||
11918 | void | |
11919 | Interface_field_reference_expression::do_check_types(Gogo*) | |
11920 | { | |
11921 | Type* type = this->expr_->type(); | |
11922 | ||
11923 | Type* points_to = type->points_to(); | |
11924 | if (points_to != NULL) | |
11925 | type = points_to; | |
11926 | ||
11927 | Interface_type* interface_type = type->interface_type(); | |
11928 | if (interface_type == NULL) | |
5c491127 | 11929 | { |
11930 | if (!type->is_error_type()) | |
11931 | this->report_error(_("expected interface or pointer to interface")); | |
11932 | } | |
e440a328 | 11933 | else |
11934 | { | |
11935 | const Typed_identifier* method = | |
11936 | interface_type->find_method(this->name_); | |
11937 | if (method == NULL) | |
11938 | { | |
631d5788 | 11939 | go_error_at(this->location(), "method %qs not in interface", |
11940 | Gogo::message_name(this->name_).c_str()); | |
e440a328 | 11941 | this->set_is_error(); |
11942 | } | |
11943 | } | |
11944 | } | |
11945 | ||
0afbb937 | 11946 | // If an interface field reference is not simply called, then it is |
11947 | // represented as a closure. The closure will hold a single variable, | |
11948 | // the value of the interface on which the method should be called. | |
11949 | // The function will be a simple thunk that pulls the value from the | |
11950 | // closure and calls the method with the remaining arguments. | |
11951 | ||
11952 | // Because method values are not common, we don't build all thunks for | |
11953 | // all possible interface methods, but instead only build them as we | |
11954 | // need them. In particular, we even build them on demand for | |
11955 | // interface methods defined in other packages. | |
11956 | ||
11957 | Interface_field_reference_expression::Interface_method_thunks | |
11958 | Interface_field_reference_expression::interface_method_thunks; | |
11959 | ||
11960 | // Find or create the thunk to call method NAME on TYPE. | |
11961 | ||
11962 | Named_object* | |
11963 | Interface_field_reference_expression::create_thunk(Gogo* gogo, | |
11964 | Interface_type* type, | |
11965 | const std::string& name) | |
11966 | { | |
11967 | std::pair<Interface_type*, Method_thunks*> val(type, NULL); | |
11968 | std::pair<Interface_method_thunks::iterator, bool> ins = | |
11969 | Interface_field_reference_expression::interface_method_thunks.insert(val); | |
11970 | if (ins.second) | |
11971 | { | |
11972 | // This is the first time we have seen this interface. | |
11973 | ins.first->second = new Method_thunks(); | |
11974 | } | |
11975 | ||
11976 | for (Method_thunks::const_iterator p = ins.first->second->begin(); | |
11977 | p != ins.first->second->end(); | |
11978 | p++) | |
11979 | if (p->first == name) | |
11980 | return p->second; | |
11981 | ||
11982 | Location loc = type->location(); | |
11983 | ||
11984 | const Typed_identifier* method_id = type->find_method(name); | |
11985 | if (method_id == NULL) | |
11986 | return Named_object::make_erroneous_name(Gogo::thunk_name()); | |
11987 | ||
11988 | Function_type* orig_fntype = method_id->type()->function_type(); | |
11989 | if (orig_fntype == NULL) | |
11990 | return Named_object::make_erroneous_name(Gogo::thunk_name()); | |
11991 | ||
11992 | Struct_field_list* sfl = new Struct_field_list(); | |
f8bdf81a | 11993 | // The type here is wrong--it should be the C function type. But it |
11994 | // doesn't really matter. | |
0afbb937 | 11995 | Type* vt = Type::make_pointer_type(Type::make_void_type()); |
11996 | sfl->push_back(Struct_field(Typed_identifier("fn.0", vt, loc))); | |
11997 | sfl->push_back(Struct_field(Typed_identifier("val.1", type, loc))); | |
6bf4793c | 11998 | Struct_type* st = Type::make_struct_type(sfl, loc); |
11999 | st->set_is_struct_incomparable(); | |
12000 | Type* closure_type = Type::make_pointer_type(st); | |
0afbb937 | 12001 | |
f8bdf81a | 12002 | Function_type* new_fntype = orig_fntype->copy_with_names(); |
0afbb937 | 12003 | |
da244e59 | 12004 | std::string thunk_name = Gogo::thunk_name(); |
12005 | Named_object* new_no = gogo->start_function(thunk_name, new_fntype, | |
0afbb937 | 12006 | false, loc); |
12007 | ||
f8bdf81a | 12008 | Variable* cvar = new Variable(closure_type, NULL, false, false, false, loc); |
12009 | cvar->set_is_used(); | |
1ecc6157 | 12010 | cvar->set_is_closure(); |
da244e59 | 12011 | Named_object* cp = Named_object::make_variable("$closure" + thunk_name, |
12012 | NULL, cvar); | |
f8bdf81a | 12013 | new_no->func_value()->set_closure_var(cp); |
0afbb937 | 12014 | |
f8bdf81a | 12015 | gogo->start_block(loc); |
0afbb937 | 12016 | |
12017 | // Field 0 of the closure is the function code pointer, field 1 is | |
12018 | // the value on which to invoke the method. | |
12019 | Expression* arg = Expression::make_var_reference(cp, loc); | |
12020 | arg = Expression::make_unary(OPERATOR_MULT, arg, loc); | |
12021 | arg = Expression::make_field_reference(arg, 1, loc); | |
12022 | ||
12023 | Expression *ifre = Expression::make_interface_field_reference(arg, name, | |
12024 | loc); | |
12025 | ||
12026 | const Typed_identifier_list* orig_params = orig_fntype->parameters(); | |
12027 | Expression_list* args; | |
12028 | if (orig_params == NULL || orig_params->empty()) | |
12029 | args = NULL; | |
12030 | else | |
12031 | { | |
12032 | const Typed_identifier_list* new_params = new_fntype->parameters(); | |
12033 | args = new Expression_list(); | |
12034 | for (Typed_identifier_list::const_iterator p = new_params->begin(); | |
f8bdf81a | 12035 | p != new_params->end(); |
0afbb937 | 12036 | ++p) |
12037 | { | |
12038 | Named_object* p_no = gogo->lookup(p->name(), NULL); | |
12039 | go_assert(p_no != NULL | |
12040 | && p_no->is_variable() | |
12041 | && p_no->var_value()->is_parameter()); | |
12042 | args->push_back(Expression::make_var_reference(p_no, loc)); | |
12043 | } | |
12044 | } | |
12045 | ||
12046 | Call_expression* call = Expression::make_call(ifre, args, | |
12047 | orig_fntype->is_varargs(), | |
12048 | loc); | |
12049 | call->set_varargs_are_lowered(); | |
12050 | ||
12051 | Statement* s = Statement::make_return_from_call(call, loc); | |
12052 | gogo->add_statement(s); | |
12053 | Block* b = gogo->finish_block(loc); | |
12054 | gogo->add_block(b, loc); | |
12055 | gogo->lower_block(new_no, b); | |
a32698ee | 12056 | gogo->flatten_block(new_no, b); |
0afbb937 | 12057 | gogo->finish_function(loc); |
12058 | ||
12059 | ins.first->second->push_back(std::make_pair(name, new_no)); | |
12060 | return new_no; | |
12061 | } | |
12062 | ||
ea664253 | 12063 | // Get the backend representation for a method value. |
e440a328 | 12064 | |
ea664253 | 12065 | Bexpression* |
12066 | Interface_field_reference_expression::do_get_backend(Translate_context* context) | |
e440a328 | 12067 | { |
0afbb937 | 12068 | Interface_type* type = this->expr_->type()->interface_type(); |
12069 | if (type == NULL) | |
12070 | { | |
12071 | go_assert(saw_errors()); | |
ea664253 | 12072 | return context->backend()->error_expression(); |
0afbb937 | 12073 | } |
12074 | ||
12075 | Named_object* thunk = | |
12076 | Interface_field_reference_expression::create_thunk(context->gogo(), | |
12077 | type, this->name_); | |
12078 | if (thunk->is_erroneous()) | |
12079 | { | |
12080 | go_assert(saw_errors()); | |
ea664253 | 12081 | return context->backend()->error_expression(); |
0afbb937 | 12082 | } |
12083 | ||
12084 | // FIXME: We should lower this earlier, but we can't it lower it in | |
12085 | // the lowering pass because at that point we don't know whether we | |
12086 | // need to create the thunk or not. If the expression is called, we | |
12087 | // don't need the thunk. | |
12088 | ||
12089 | Location loc = this->location(); | |
12090 | ||
12091 | Struct_field_list* fields = new Struct_field_list(); | |
12092 | fields->push_back(Struct_field(Typed_identifier("fn.0", | |
12093 | thunk->func_value()->type(), | |
12094 | loc))); | |
12095 | fields->push_back(Struct_field(Typed_identifier("val.1", | |
12096 | this->expr_->type(), | |
12097 | loc))); | |
12098 | Struct_type* st = Type::make_struct_type(fields, loc); | |
6bf4793c | 12099 | st->set_is_struct_incomparable(); |
0afbb937 | 12100 | |
12101 | Expression_list* vals = new Expression_list(); | |
12102 | vals->push_back(Expression::make_func_code_reference(thunk, loc)); | |
12103 | vals->push_back(this->expr_); | |
12104 | ||
12105 | Expression* expr = Expression::make_struct_composite_literal(st, vals, loc); | |
ea664253 | 12106 | Bexpression* bclosure = |
12107 | Expression::make_heap_expression(expr, loc)->get_backend(context); | |
0afbb937 | 12108 | |
2387f644 | 12109 | Expression* nil_check = |
12110 | Expression::make_binary(OPERATOR_EQEQ, this->expr_, | |
12111 | Expression::make_nil(loc), loc); | |
ea664253 | 12112 | Bexpression* bnil_check = nil_check->get_backend(context); |
0afbb937 | 12113 | |
2387f644 | 12114 | Gogo* gogo = context->gogo(); |
ea664253 | 12115 | Bexpression* bcrash = gogo->runtime_error(RUNTIME_ERROR_NIL_DEREFERENCE, |
12116 | loc)->get_backend(context); | |
2387f644 | 12117 | |
93715b75 | 12118 | Bfunction* bfn = context->function()->func_value()->get_decl(); |
2387f644 | 12119 | Bexpression* bcond = |
93715b75 | 12120 | gogo->backend()->conditional_expression(bfn, NULL, |
12121 | bnil_check, bcrash, NULL, loc); | |
0ab48656 | 12122 | Bfunction* bfunction = context->function()->func_value()->get_decl(); |
12123 | Bstatement* cond_statement = | |
12124 | gogo->backend()->expression_statement(bfunction, bcond); | |
ea664253 | 12125 | return gogo->backend()->compound_expression(cond_statement, bclosure, loc); |
e440a328 | 12126 | } |
12127 | ||
d751bb78 | 12128 | // Dump ast representation for an interface field reference. |
12129 | ||
12130 | void | |
12131 | Interface_field_reference_expression::do_dump_expression( | |
12132 | Ast_dump_context* ast_dump_context) const | |
12133 | { | |
12134 | this->expr_->dump_expression(ast_dump_context); | |
12135 | ast_dump_context->ostream() << "." << this->name_; | |
12136 | } | |
12137 | ||
e440a328 | 12138 | // Make a reference to a field in an interface. |
12139 | ||
12140 | Expression* | |
12141 | Expression::make_interface_field_reference(Expression* expr, | |
12142 | const std::string& field, | |
b13c66cd | 12143 | Location location) |
e440a328 | 12144 | { |
12145 | return new Interface_field_reference_expression(expr, field, location); | |
12146 | } | |
12147 | ||
12148 | // A general selector. This is a Parser_expression for LEFT.NAME. It | |
12149 | // is lowered after we know the type of the left hand side. | |
12150 | ||
12151 | class Selector_expression : public Parser_expression | |
12152 | { | |
12153 | public: | |
12154 | Selector_expression(Expression* left, const std::string& name, | |
b13c66cd | 12155 | Location location) |
e440a328 | 12156 | : Parser_expression(EXPRESSION_SELECTOR, location), |
12157 | left_(left), name_(name) | |
12158 | { } | |
12159 | ||
12160 | protected: | |
12161 | int | |
12162 | do_traverse(Traverse* traverse) | |
12163 | { return Expression::traverse(&this->left_, traverse); } | |
12164 | ||
12165 | Expression* | |
ceeb4318 | 12166 | do_lower(Gogo*, Named_object*, Statement_inserter*, int); |
e440a328 | 12167 | |
12168 | Expression* | |
12169 | do_copy() | |
12170 | { | |
12171 | return new Selector_expression(this->left_->copy(), this->name_, | |
12172 | this->location()); | |
12173 | } | |
12174 | ||
d751bb78 | 12175 | void |
12176 | do_dump_expression(Ast_dump_context* ast_dump_context) const; | |
12177 | ||
e440a328 | 12178 | private: |
12179 | Expression* | |
12180 | lower_method_expression(Gogo*); | |
12181 | ||
12182 | // The expression on the left hand side. | |
12183 | Expression* left_; | |
12184 | // The name on the right hand side. | |
12185 | std::string name_; | |
12186 | }; | |
12187 | ||
12188 | // Lower a selector expression once we know the real type of the left | |
12189 | // hand side. | |
12190 | ||
12191 | Expression* | |
ceeb4318 | 12192 | Selector_expression::do_lower(Gogo* gogo, Named_object*, Statement_inserter*, |
12193 | int) | |
e440a328 | 12194 | { |
12195 | Expression* left = this->left_; | |
12196 | if (left->is_type_expression()) | |
12197 | return this->lower_method_expression(gogo); | |
12198 | return Type::bind_field_or_method(gogo, left->type(), left, this->name_, | |
12199 | this->location()); | |
12200 | } | |
12201 | ||
12202 | // Lower a method expression T.M or (*T).M. We turn this into a | |
12203 | // function literal. | |
12204 | ||
12205 | Expression* | |
12206 | Selector_expression::lower_method_expression(Gogo* gogo) | |
12207 | { | |
b13c66cd | 12208 | Location location = this->location(); |
868b439e | 12209 | Type* left_type = this->left_->type(); |
12210 | Type* type = left_type; | |
e440a328 | 12211 | const std::string& name(this->name_); |
12212 | ||
12213 | bool is_pointer; | |
12214 | if (type->points_to() == NULL) | |
12215 | is_pointer = false; | |
12216 | else | |
12217 | { | |
12218 | is_pointer = true; | |
12219 | type = type->points_to(); | |
12220 | } | |
12221 | Named_type* nt = type->named_type(); | |
12222 | if (nt == NULL) | |
12223 | { | |
631d5788 | 12224 | go_error_at(location, |
12225 | ("method expression requires named type or " | |
12226 | "pointer to named type")); | |
e440a328 | 12227 | return Expression::make_error(location); |
12228 | } | |
12229 | ||
12230 | bool is_ambiguous; | |
12231 | Method* method = nt->method_function(name, &is_ambiguous); | |
ab1468c3 | 12232 | const Typed_identifier* imethod = NULL; |
dcc8506b | 12233 | if (method == NULL && !is_pointer) |
ab1468c3 | 12234 | { |
12235 | Interface_type* it = nt->interface_type(); | |
12236 | if (it != NULL) | |
12237 | imethod = it->find_method(name); | |
12238 | } | |
12239 | ||
868b439e | 12240 | if ((method == NULL && imethod == NULL) |
12241 | || (left_type->named_type() != NULL && left_type->points_to() != NULL)) | |
e440a328 | 12242 | { |
12243 | if (!is_ambiguous) | |
631d5788 | 12244 | go_error_at(location, "type %<%s%s%> has no method %<%s%>", |
12245 | is_pointer ? "*" : "", | |
12246 | nt->message_name().c_str(), | |
12247 | Gogo::message_name(name).c_str()); | |
e440a328 | 12248 | else |
631d5788 | 12249 | go_error_at(location, "method %<%s%s%> is ambiguous in type %<%s%>", |
12250 | Gogo::message_name(name).c_str(), | |
12251 | is_pointer ? "*" : "", | |
12252 | nt->message_name().c_str()); | |
e440a328 | 12253 | return Expression::make_error(location); |
12254 | } | |
12255 | ||
ab1468c3 | 12256 | if (method != NULL && !is_pointer && !method->is_value_method()) |
e440a328 | 12257 | { |
631d5788 | 12258 | go_error_at(location, "method requires pointer (use %<(*%s).%s%>)", |
12259 | nt->message_name().c_str(), | |
12260 | Gogo::message_name(name).c_str()); | |
e440a328 | 12261 | return Expression::make_error(location); |
12262 | } | |
12263 | ||
12264 | // Build a new function type in which the receiver becomes the first | |
12265 | // argument. | |
ab1468c3 | 12266 | Function_type* method_type; |
12267 | if (method != NULL) | |
12268 | { | |
12269 | method_type = method->type(); | |
c484d925 | 12270 | go_assert(method_type->is_method()); |
ab1468c3 | 12271 | } |
12272 | else | |
12273 | { | |
12274 | method_type = imethod->type()->function_type(); | |
c484d925 | 12275 | go_assert(method_type != NULL && !method_type->is_method()); |
ab1468c3 | 12276 | } |
e440a328 | 12277 | |
12278 | const char* const receiver_name = "$this"; | |
12279 | Typed_identifier_list* parameters = new Typed_identifier_list(); | |
12280 | parameters->push_back(Typed_identifier(receiver_name, this->left_->type(), | |
12281 | location)); | |
12282 | ||
12283 | const Typed_identifier_list* method_parameters = method_type->parameters(); | |
12284 | if (method_parameters != NULL) | |
12285 | { | |
f470da59 | 12286 | int i = 0; |
e440a328 | 12287 | for (Typed_identifier_list::const_iterator p = method_parameters->begin(); |
12288 | p != method_parameters->end(); | |
f470da59 | 12289 | ++p, ++i) |
12290 | { | |
68883531 | 12291 | if (!p->name().empty()) |
f470da59 | 12292 | parameters->push_back(*p); |
12293 | else | |
12294 | { | |
12295 | char buf[20]; | |
12296 | snprintf(buf, sizeof buf, "$param%d", i); | |
12297 | parameters->push_back(Typed_identifier(buf, p->type(), | |
12298 | p->location())); | |
12299 | } | |
12300 | } | |
e440a328 | 12301 | } |
12302 | ||
12303 | const Typed_identifier_list* method_results = method_type->results(); | |
12304 | Typed_identifier_list* results; | |
12305 | if (method_results == NULL) | |
12306 | results = NULL; | |
12307 | else | |
12308 | { | |
12309 | results = new Typed_identifier_list(); | |
12310 | for (Typed_identifier_list::const_iterator p = method_results->begin(); | |
12311 | p != method_results->end(); | |
12312 | ++p) | |
12313 | results->push_back(*p); | |
12314 | } | |
12315 | ||
12316 | Function_type* fntype = Type::make_function_type(NULL, parameters, results, | |
12317 | location); | |
12318 | if (method_type->is_varargs()) | |
12319 | fntype->set_is_varargs(); | |
12320 | ||
12321 | // We generate methods which always takes a pointer to the receiver | |
12322 | // as their first argument. If this is for a pointer type, we can | |
12323 | // simply reuse the existing function. We use an internal hack to | |
12324 | // get the right type. | |
8381eda7 | 12325 | // FIXME: This optimization is disabled because it doesn't yet work |
12326 | // with function descriptors when the method expression is not | |
12327 | // directly called. | |
12328 | if (method != NULL && is_pointer && false) | |
e440a328 | 12329 | { |
12330 | Named_object* mno = (method->needs_stub_method() | |
12331 | ? method->stub_object() | |
12332 | : method->named_object()); | |
12333 | Expression* f = Expression::make_func_reference(mno, NULL, location); | |
12334 | f = Expression::make_cast(fntype, f, location); | |
12335 | Type_conversion_expression* tce = | |
12336 | static_cast<Type_conversion_expression*>(f); | |
12337 | tce->set_may_convert_function_types(); | |
12338 | return f; | |
12339 | } | |
12340 | ||
12341 | Named_object* no = gogo->start_function(Gogo::thunk_name(), fntype, false, | |
12342 | location); | |
12343 | ||
12344 | Named_object* vno = gogo->lookup(receiver_name, NULL); | |
c484d925 | 12345 | go_assert(vno != NULL); |
e440a328 | 12346 | Expression* ve = Expression::make_var_reference(vno, location); |
ab1468c3 | 12347 | Expression* bm; |
12348 | if (method != NULL) | |
12349 | bm = Type::bind_field_or_method(gogo, nt, ve, name, location); | |
12350 | else | |
12351 | bm = Expression::make_interface_field_reference(ve, name, location); | |
f690b0bb | 12352 | |
12353 | // Even though we found the method above, if it has an error type we | |
12354 | // may see an error here. | |
12355 | if (bm->is_error_expression()) | |
463fe805 | 12356 | { |
12357 | gogo->finish_function(location); | |
12358 | return bm; | |
12359 | } | |
e440a328 | 12360 | |
12361 | Expression_list* args; | |
f470da59 | 12362 | if (parameters->size() <= 1) |
e440a328 | 12363 | args = NULL; |
12364 | else | |
12365 | { | |
12366 | args = new Expression_list(); | |
f470da59 | 12367 | Typed_identifier_list::const_iterator p = parameters->begin(); |
12368 | ++p; | |
12369 | for (; p != parameters->end(); ++p) | |
e440a328 | 12370 | { |
12371 | vno = gogo->lookup(p->name(), NULL); | |
c484d925 | 12372 | go_assert(vno != NULL); |
e440a328 | 12373 | args->push_back(Expression::make_var_reference(vno, location)); |
12374 | } | |
12375 | } | |
12376 | ||
ceeb4318 | 12377 | gogo->start_block(location); |
12378 | ||
e440a328 | 12379 | Call_expression* call = Expression::make_call(bm, args, |
12380 | method_type->is_varargs(), | |
12381 | location); | |
12382 | ||
0afbb937 | 12383 | Statement* s = Statement::make_return_from_call(call, location); |
e440a328 | 12384 | gogo->add_statement(s); |
12385 | ||
ceeb4318 | 12386 | Block* b = gogo->finish_block(location); |
12387 | ||
12388 | gogo->add_block(b, location); | |
12389 | ||
12390 | // Lower the call in case there are multiple results. | |
12391 | gogo->lower_block(no, b); | |
a32698ee | 12392 | gogo->flatten_block(no, b); |
ceeb4318 | 12393 | |
e440a328 | 12394 | gogo->finish_function(location); |
12395 | ||
12396 | return Expression::make_func_reference(no, NULL, location); | |
12397 | } | |
12398 | ||
d751bb78 | 12399 | // Dump the ast for a selector expression. |
12400 | ||
12401 | void | |
12402 | Selector_expression::do_dump_expression(Ast_dump_context* ast_dump_context) | |
12403 | const | |
12404 | { | |
12405 | ast_dump_context->dump_expression(this->left_); | |
12406 | ast_dump_context->ostream() << "."; | |
12407 | ast_dump_context->ostream() << this->name_; | |
12408 | } | |
12409 | ||
e440a328 | 12410 | // Make a selector expression. |
12411 | ||
12412 | Expression* | |
12413 | Expression::make_selector(Expression* left, const std::string& name, | |
b13c66cd | 12414 | Location location) |
e440a328 | 12415 | { |
12416 | return new Selector_expression(left, name, location); | |
12417 | } | |
12418 | ||
da244e59 | 12419 | // Class Allocation_expression. |
e440a328 | 12420 | |
da244e59 | 12421 | int |
12422 | Allocation_expression::do_traverse(Traverse* traverse) | |
e440a328 | 12423 | { |
da244e59 | 12424 | return Type::traverse(this->type_, traverse); |
12425 | } | |
e440a328 | 12426 | |
da244e59 | 12427 | Type* |
12428 | Allocation_expression::do_type() | |
12429 | { | |
12430 | return Type::make_pointer_type(this->type_); | |
12431 | } | |
e440a328 | 12432 | |
da244e59 | 12433 | // Make a copy of an allocation expression. |
e440a328 | 12434 | |
da244e59 | 12435 | Expression* |
12436 | Allocation_expression::do_copy() | |
12437 | { | |
12438 | Allocation_expression* alloc = | |
12439 | new Allocation_expression(this->type_, this->location()); | |
12440 | if (this->allocate_on_stack_) | |
12441 | alloc->set_allocate_on_stack(); | |
12442 | return alloc; | |
12443 | } | |
e440a328 | 12444 | |
ea664253 | 12445 | // Return the backend representation for an allocation expression. |
e440a328 | 12446 | |
ea664253 | 12447 | Bexpression* |
12448 | Allocation_expression::do_get_backend(Translate_context* context) | |
e440a328 | 12449 | { |
2c809f8f | 12450 | Gogo* gogo = context->gogo(); |
12451 | Location loc = this->location(); | |
da244e59 | 12452 | |
45ff893b | 12453 | Node* n = Node::make_node(this); |
12454 | if (this->allocate_on_stack_ | |
12455 | || (n->encoding() & ESCAPE_MASK) == int(Node::ESCAPE_NONE)) | |
da244e59 | 12456 | { |
2a305b85 | 12457 | int64_t size; |
12458 | bool ok = this->type_->backend_type_size(gogo, &size); | |
12459 | if (!ok) | |
12460 | { | |
12461 | go_assert(saw_errors()); | |
12462 | return gogo->backend()->error_expression(); | |
12463 | } | |
d5d1c295 | 12464 | return gogo->backend()->stack_allocation_expression(size, loc); |
da244e59 | 12465 | } |
12466 | ||
2a305b85 | 12467 | Btype* btype = this->type_->get_backend(gogo); |
12468 | Bexpression* space = | |
ea664253 | 12469 | gogo->allocate_memory(this->type_, loc)->get_backend(context); |
d5d1c295 | 12470 | Btype* pbtype = gogo->backend()->pointer_type(btype); |
ea664253 | 12471 | return gogo->backend()->convert_expression(pbtype, space, loc); |
e440a328 | 12472 | } |
12473 | ||
d751bb78 | 12474 | // Dump ast representation for an allocation expression. |
12475 | ||
12476 | void | |
12477 | Allocation_expression::do_dump_expression(Ast_dump_context* ast_dump_context) | |
12478 | const | |
12479 | { | |
12480 | ast_dump_context->ostream() << "new("; | |
12481 | ast_dump_context->dump_type(this->type_); | |
12482 | ast_dump_context->ostream() << ")"; | |
12483 | } | |
12484 | ||
e440a328 | 12485 | // Make an allocation expression. |
12486 | ||
12487 | Expression* | |
b13c66cd | 12488 | Expression::make_allocation(Type* type, Location location) |
e440a328 | 12489 | { |
12490 | return new Allocation_expression(type, location); | |
12491 | } | |
12492 | ||
e32de7ba | 12493 | // Class Ordered_value_list. |
e440a328 | 12494 | |
12495 | int | |
e32de7ba | 12496 | Ordered_value_list::traverse_vals(Traverse* traverse) |
e440a328 | 12497 | { |
0c4f5a19 | 12498 | if (this->vals_ != NULL) |
12499 | { | |
12500 | if (this->traverse_order_ == NULL) | |
12501 | { | |
12502 | if (this->vals_->traverse(traverse) == TRAVERSE_EXIT) | |
12503 | return TRAVERSE_EXIT; | |
12504 | } | |
12505 | else | |
12506 | { | |
e32de7ba | 12507 | for (std::vector<unsigned long>::const_iterator p = |
12508 | this->traverse_order_->begin(); | |
0c4f5a19 | 12509 | p != this->traverse_order_->end(); |
12510 | ++p) | |
12511 | { | |
12512 | if (Expression::traverse(&this->vals_->at(*p), traverse) | |
12513 | == TRAVERSE_EXIT) | |
12514 | return TRAVERSE_EXIT; | |
12515 | } | |
12516 | } | |
12517 | } | |
e32de7ba | 12518 | return TRAVERSE_CONTINUE; |
12519 | } | |
12520 | ||
12521 | // Class Struct_construction_expression. | |
12522 | ||
12523 | // Traversal. | |
12524 | ||
12525 | int | |
12526 | Struct_construction_expression::do_traverse(Traverse* traverse) | |
12527 | { | |
12528 | if (this->traverse_vals(traverse) == TRAVERSE_EXIT) | |
12529 | return TRAVERSE_EXIT; | |
e440a328 | 12530 | if (Type::traverse(this->type_, traverse) == TRAVERSE_EXIT) |
12531 | return TRAVERSE_EXIT; | |
12532 | return TRAVERSE_CONTINUE; | |
12533 | } | |
12534 | ||
12535 | // Return whether this is a constant initializer. | |
12536 | ||
12537 | bool | |
12538 | Struct_construction_expression::is_constant_struct() const | |
12539 | { | |
e32de7ba | 12540 | if (this->vals() == NULL) |
e440a328 | 12541 | return true; |
e32de7ba | 12542 | for (Expression_list::const_iterator pv = this->vals()->begin(); |
12543 | pv != this->vals()->end(); | |
e440a328 | 12544 | ++pv) |
12545 | { | |
12546 | if (*pv != NULL | |
12547 | && !(*pv)->is_constant() | |
12548 | && (!(*pv)->is_composite_literal() | |
12549 | || (*pv)->is_nonconstant_composite_literal())) | |
12550 | return false; | |
12551 | } | |
12552 | ||
12553 | const Struct_field_list* fields = this->type_->struct_type()->fields(); | |
12554 | for (Struct_field_list::const_iterator pf = fields->begin(); | |
12555 | pf != fields->end(); | |
12556 | ++pf) | |
12557 | { | |
12558 | // There are no constant constructors for interfaces. | |
12559 | if (pf->type()->interface_type() != NULL) | |
12560 | return false; | |
12561 | } | |
12562 | ||
12563 | return true; | |
12564 | } | |
12565 | ||
3ae06f68 | 12566 | // Return whether this struct can be used as a constant initializer. |
f9ca30f9 | 12567 | |
12568 | bool | |
3ae06f68 | 12569 | Struct_construction_expression::do_is_static_initializer() const |
f9ca30f9 | 12570 | { |
e32de7ba | 12571 | if (this->vals() == NULL) |
f9ca30f9 | 12572 | return true; |
e32de7ba | 12573 | for (Expression_list::const_iterator pv = this->vals()->begin(); |
12574 | pv != this->vals()->end(); | |
f9ca30f9 | 12575 | ++pv) |
12576 | { | |
3ae06f68 | 12577 | if (*pv != NULL && !(*pv)->is_static_initializer()) |
f9ca30f9 | 12578 | return false; |
12579 | } | |
de048538 | 12580 | |
12581 | const Struct_field_list* fields = this->type_->struct_type()->fields(); | |
12582 | for (Struct_field_list::const_iterator pf = fields->begin(); | |
12583 | pf != fields->end(); | |
12584 | ++pf) | |
12585 | { | |
12586 | // There are no constant constructors for interfaces. | |
12587 | if (pf->type()->interface_type() != NULL) | |
12588 | return false; | |
12589 | } | |
12590 | ||
f9ca30f9 | 12591 | return true; |
12592 | } | |
12593 | ||
e440a328 | 12594 | // Final type determination. |
12595 | ||
12596 | void | |
12597 | Struct_construction_expression::do_determine_type(const Type_context*) | |
12598 | { | |
e32de7ba | 12599 | if (this->vals() == NULL) |
e440a328 | 12600 | return; |
12601 | const Struct_field_list* fields = this->type_->struct_type()->fields(); | |
e32de7ba | 12602 | Expression_list::const_iterator pv = this->vals()->begin(); |
e440a328 | 12603 | for (Struct_field_list::const_iterator pf = fields->begin(); |
12604 | pf != fields->end(); | |
12605 | ++pf, ++pv) | |
12606 | { | |
e32de7ba | 12607 | if (pv == this->vals()->end()) |
e440a328 | 12608 | return; |
12609 | if (*pv != NULL) | |
12610 | { | |
12611 | Type_context subcontext(pf->type(), false); | |
12612 | (*pv)->determine_type(&subcontext); | |
12613 | } | |
12614 | } | |
a6cb4c0e | 12615 | // Extra values are an error we will report elsewhere; we still want |
12616 | // to determine the type to avoid knockon errors. | |
e32de7ba | 12617 | for (; pv != this->vals()->end(); ++pv) |
a6cb4c0e | 12618 | (*pv)->determine_type_no_context(); |
e440a328 | 12619 | } |
12620 | ||
12621 | // Check types. | |
12622 | ||
12623 | void | |
12624 | Struct_construction_expression::do_check_types(Gogo*) | |
12625 | { | |
e32de7ba | 12626 | if (this->vals() == NULL) |
e440a328 | 12627 | return; |
12628 | ||
12629 | Struct_type* st = this->type_->struct_type(); | |
e32de7ba | 12630 | if (this->vals()->size() > st->field_count()) |
e440a328 | 12631 | { |
12632 | this->report_error(_("too many expressions for struct")); | |
12633 | return; | |
12634 | } | |
12635 | ||
12636 | const Struct_field_list* fields = st->fields(); | |
e32de7ba | 12637 | Expression_list::const_iterator pv = this->vals()->begin(); |
e440a328 | 12638 | int i = 0; |
12639 | for (Struct_field_list::const_iterator pf = fields->begin(); | |
12640 | pf != fields->end(); | |
12641 | ++pf, ++pv, ++i) | |
12642 | { | |
e32de7ba | 12643 | if (pv == this->vals()->end()) |
e440a328 | 12644 | { |
12645 | this->report_error(_("too few expressions for struct")); | |
12646 | break; | |
12647 | } | |
12648 | ||
12649 | if (*pv == NULL) | |
12650 | continue; | |
12651 | ||
12652 | std::string reason; | |
12653 | if (!Type::are_assignable(pf->type(), (*pv)->type(), &reason)) | |
12654 | { | |
12655 | if (reason.empty()) | |
631d5788 | 12656 | go_error_at((*pv)->location(), |
12657 | "incompatible type for field %d in struct construction", | |
12658 | i + 1); | |
e440a328 | 12659 | else |
631d5788 | 12660 | go_error_at((*pv)->location(), |
12661 | ("incompatible type for field %d in " | |
12662 | "struct construction (%s)"), | |
12663 | i + 1, reason.c_str()); | |
e440a328 | 12664 | this->set_is_error(); |
12665 | } | |
12666 | } | |
e32de7ba | 12667 | go_assert(pv == this->vals()->end()); |
e440a328 | 12668 | } |
12669 | ||
8ba8cc87 | 12670 | // Flatten a struct construction expression. Store the values into |
12671 | // temporaries in case they need interface conversion. | |
12672 | ||
12673 | Expression* | |
12674 | Struct_construction_expression::do_flatten(Gogo*, Named_object*, | |
12675 | Statement_inserter* inserter) | |
12676 | { | |
e32de7ba | 12677 | if (this->vals() == NULL) |
8ba8cc87 | 12678 | return this; |
12679 | ||
12680 | // If this is a constant struct, we don't need temporaries. | |
de048538 | 12681 | if (this->is_constant_struct() || this->is_static_initializer()) |
8ba8cc87 | 12682 | return this; |
12683 | ||
12684 | Location loc = this->location(); | |
e32de7ba | 12685 | for (Expression_list::iterator pv = this->vals()->begin(); |
12686 | pv != this->vals()->end(); | |
8ba8cc87 | 12687 | ++pv) |
12688 | { | |
12689 | if (*pv != NULL) | |
12690 | { | |
5bf8be8b | 12691 | if ((*pv)->is_error_expression() || (*pv)->type()->is_error_type()) |
12692 | { | |
12693 | go_assert(saw_errors()); | |
12694 | return Expression::make_error(loc); | |
12695 | } | |
8ba8cc87 | 12696 | if (!(*pv)->is_variable()) |
12697 | { | |
12698 | Temporary_statement* temp = | |
12699 | Statement::make_temporary(NULL, *pv, loc); | |
12700 | inserter->insert(temp); | |
12701 | *pv = Expression::make_temporary_reference(temp, loc); | |
12702 | } | |
12703 | } | |
12704 | } | |
12705 | return this; | |
12706 | } | |
12707 | ||
ea664253 | 12708 | // Return the backend representation for constructing a struct. |
e440a328 | 12709 | |
ea664253 | 12710 | Bexpression* |
12711 | Struct_construction_expression::do_get_backend(Translate_context* context) | |
e440a328 | 12712 | { |
12713 | Gogo* gogo = context->gogo(); | |
12714 | ||
2c809f8f | 12715 | Btype* btype = this->type_->get_backend(gogo); |
e32de7ba | 12716 | if (this->vals() == NULL) |
ea664253 | 12717 | return gogo->backend()->zero_expression(btype); |
e440a328 | 12718 | |
e440a328 | 12719 | const Struct_field_list* fields = this->type_->struct_type()->fields(); |
e32de7ba | 12720 | Expression_list::const_iterator pv = this->vals()->begin(); |
2c809f8f | 12721 | std::vector<Bexpression*> init; |
12722 | for (Struct_field_list::const_iterator pf = fields->begin(); | |
12723 | pf != fields->end(); | |
12724 | ++pf) | |
e440a328 | 12725 | { |
63697958 | 12726 | Btype* fbtype = pf->type()->get_backend(gogo); |
e32de7ba | 12727 | if (pv == this->vals()->end()) |
2c809f8f | 12728 | init.push_back(gogo->backend()->zero_expression(fbtype)); |
e440a328 | 12729 | else if (*pv == NULL) |
12730 | { | |
2c809f8f | 12731 | init.push_back(gogo->backend()->zero_expression(fbtype)); |
e440a328 | 12732 | ++pv; |
12733 | } | |
12734 | else | |
12735 | { | |
2c809f8f | 12736 | Expression* val = |
12737 | Expression::convert_for_assignment(gogo, pf->type(), | |
12738 | *pv, this->location()); | |
ea664253 | 12739 | init.push_back(val->get_backend(context)); |
e440a328 | 12740 | ++pv; |
12741 | } | |
e440a328 | 12742 | } |
ea664253 | 12743 | return gogo->backend()->constructor_expression(btype, init, this->location()); |
e440a328 | 12744 | } |
12745 | ||
12746 | // Export a struct construction. | |
12747 | ||
12748 | void | |
12749 | Struct_construction_expression::do_export(Export* exp) const | |
12750 | { | |
12751 | exp->write_c_string("convert("); | |
12752 | exp->write_type(this->type_); | |
e32de7ba | 12753 | for (Expression_list::const_iterator pv = this->vals()->begin(); |
12754 | pv != this->vals()->end(); | |
e440a328 | 12755 | ++pv) |
12756 | { | |
12757 | exp->write_c_string(", "); | |
12758 | if (*pv != NULL) | |
12759 | (*pv)->export_expression(exp); | |
12760 | } | |
12761 | exp->write_c_string(")"); | |
12762 | } | |
12763 | ||
d751bb78 | 12764 | // Dump ast representation of a struct construction expression. |
12765 | ||
12766 | void | |
12767 | Struct_construction_expression::do_dump_expression( | |
12768 | Ast_dump_context* ast_dump_context) const | |
12769 | { | |
d751bb78 | 12770 | ast_dump_context->dump_type(this->type_); |
12771 | ast_dump_context->ostream() << "{"; | |
e32de7ba | 12772 | ast_dump_context->dump_expression_list(this->vals()); |
d751bb78 | 12773 | ast_dump_context->ostream() << "}"; |
12774 | } | |
12775 | ||
e440a328 | 12776 | // Make a struct composite literal. This used by the thunk code. |
12777 | ||
12778 | Expression* | |
12779 | Expression::make_struct_composite_literal(Type* type, Expression_list* vals, | |
b13c66cd | 12780 | Location location) |
e440a328 | 12781 | { |
c484d925 | 12782 | go_assert(type->struct_type() != NULL); |
e440a328 | 12783 | return new Struct_construction_expression(type, vals, location); |
12784 | } | |
12785 | ||
da244e59 | 12786 | // Class Array_construction_expression. |
e440a328 | 12787 | |
12788 | // Traversal. | |
12789 | ||
12790 | int | |
12791 | Array_construction_expression::do_traverse(Traverse* traverse) | |
12792 | { | |
e32de7ba | 12793 | if (this->traverse_vals(traverse) == TRAVERSE_EXIT) |
e440a328 | 12794 | return TRAVERSE_EXIT; |
12795 | if (Type::traverse(this->type_, traverse) == TRAVERSE_EXIT) | |
12796 | return TRAVERSE_EXIT; | |
12797 | return TRAVERSE_CONTINUE; | |
12798 | } | |
12799 | ||
12800 | // Return whether this is a constant initializer. | |
12801 | ||
12802 | bool | |
12803 | Array_construction_expression::is_constant_array() const | |
12804 | { | |
e32de7ba | 12805 | if (this->vals() == NULL) |
e440a328 | 12806 | return true; |
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(); | |
e440a328 | 12814 | ++pv) |
12815 | { | |
12816 | if (*pv != NULL | |
12817 | && !(*pv)->is_constant() | |
12818 | && (!(*pv)->is_composite_literal() | |
12819 | || (*pv)->is_nonconstant_composite_literal())) | |
12820 | return false; | |
12821 | } | |
12822 | return true; | |
12823 | } | |
12824 | ||
3ae06f68 | 12825 | // Return whether this can be used a constant initializer. |
f9ca30f9 | 12826 | |
12827 | bool | |
3ae06f68 | 12828 | Array_construction_expression::do_is_static_initializer() const |
f9ca30f9 | 12829 | { |
e32de7ba | 12830 | if (this->vals() == NULL) |
f9ca30f9 | 12831 | return true; |
de048538 | 12832 | |
12833 | // There are no constant constructors for interfaces. | |
12834 | if (this->type_->array_type()->element_type()->interface_type() != NULL) | |
12835 | return false; | |
12836 | ||
e32de7ba | 12837 | for (Expression_list::const_iterator pv = this->vals()->begin(); |
12838 | pv != this->vals()->end(); | |
f9ca30f9 | 12839 | ++pv) |
12840 | { | |
3ae06f68 | 12841 | if (*pv != NULL && !(*pv)->is_static_initializer()) |
f9ca30f9 | 12842 | return false; |
12843 | } | |
12844 | return true; | |
12845 | } | |
12846 | ||
e440a328 | 12847 | // Final type determination. |
12848 | ||
12849 | void | |
12850 | Array_construction_expression::do_determine_type(const Type_context*) | |
12851 | { | |
e32de7ba | 12852 | if (this->vals() == NULL) |
e440a328 | 12853 | return; |
12854 | Type_context subcontext(this->type_->array_type()->element_type(), false); | |
e32de7ba | 12855 | for (Expression_list::const_iterator pv = this->vals()->begin(); |
12856 | pv != this->vals()->end(); | |
e440a328 | 12857 | ++pv) |
12858 | { | |
12859 | if (*pv != NULL) | |
12860 | (*pv)->determine_type(&subcontext); | |
12861 | } | |
12862 | } | |
12863 | ||
12864 | // Check types. | |
12865 | ||
12866 | void | |
12867 | Array_construction_expression::do_check_types(Gogo*) | |
12868 | { | |
e32de7ba | 12869 | if (this->vals() == NULL) |
e440a328 | 12870 | return; |
12871 | ||
12872 | Array_type* at = this->type_->array_type(); | |
12873 | int i = 0; | |
12874 | Type* element_type = at->element_type(); | |
e32de7ba | 12875 | for (Expression_list::const_iterator pv = this->vals()->begin(); |
12876 | pv != this->vals()->end(); | |
e440a328 | 12877 | ++pv, ++i) |
12878 | { | |
12879 | if (*pv != NULL | |
12880 | && !Type::are_assignable(element_type, (*pv)->type(), NULL)) | |
12881 | { | |
631d5788 | 12882 | go_error_at((*pv)->location(), |
12883 | "incompatible type for element %d in composite literal", | |
12884 | i + 1); | |
e440a328 | 12885 | this->set_is_error(); |
12886 | } | |
12887 | } | |
e440a328 | 12888 | } |
12889 | ||
8ba8cc87 | 12890 | // Flatten an array construction expression. Store the values into |
12891 | // temporaries in case they need interface conversion. | |
12892 | ||
12893 | Expression* | |
12894 | Array_construction_expression::do_flatten(Gogo*, Named_object*, | |
12895 | Statement_inserter* inserter) | |
12896 | { | |
e32de7ba | 12897 | if (this->vals() == NULL) |
8ba8cc87 | 12898 | return this; |
12899 | ||
12900 | // If this is a constant array, we don't need temporaries. | |
de048538 | 12901 | if (this->is_constant_array() || this->is_static_initializer()) |
8ba8cc87 | 12902 | return this; |
12903 | ||
12904 | Location loc = this->location(); | |
e32de7ba | 12905 | for (Expression_list::iterator pv = this->vals()->begin(); |
12906 | pv != this->vals()->end(); | |
8ba8cc87 | 12907 | ++pv) |
12908 | { | |
12909 | if (*pv != NULL) | |
12910 | { | |
5bf8be8b | 12911 | if ((*pv)->is_error_expression() || (*pv)->type()->is_error_type()) |
12912 | { | |
12913 | go_assert(saw_errors()); | |
12914 | return Expression::make_error(loc); | |
12915 | } | |
8ba8cc87 | 12916 | if (!(*pv)->is_variable()) |
12917 | { | |
12918 | Temporary_statement* temp = | |
12919 | Statement::make_temporary(NULL, *pv, loc); | |
12920 | inserter->insert(temp); | |
12921 | *pv = Expression::make_temporary_reference(temp, loc); | |
12922 | } | |
12923 | } | |
12924 | } | |
12925 | return this; | |
12926 | } | |
12927 | ||
2c809f8f | 12928 | // Get a constructor expression for the array values. |
e440a328 | 12929 | |
2c809f8f | 12930 | Bexpression* |
12931 | Array_construction_expression::get_constructor(Translate_context* context, | |
12932 | Btype* array_btype) | |
e440a328 | 12933 | { |
e440a328 | 12934 | Type* element_type = this->type_->array_type()->element_type(); |
2c809f8f | 12935 | |
12936 | std::vector<unsigned long> indexes; | |
12937 | std::vector<Bexpression*> vals; | |
12938 | Gogo* gogo = context->gogo(); | |
e32de7ba | 12939 | if (this->vals() != NULL) |
e440a328 | 12940 | { |
12941 | size_t i = 0; | |
ffe743ca | 12942 | std::vector<unsigned long>::const_iterator pi; |
12943 | if (this->indexes_ != NULL) | |
12944 | pi = this->indexes_->begin(); | |
e32de7ba | 12945 | for (Expression_list::const_iterator pv = this->vals()->begin(); |
12946 | pv != this->vals()->end(); | |
e440a328 | 12947 | ++pv, ++i) |
12948 | { | |
ffe743ca | 12949 | if (this->indexes_ != NULL) |
12950 | go_assert(pi != this->indexes_->end()); | |
ffe743ca | 12951 | |
12952 | if (this->indexes_ == NULL) | |
2c809f8f | 12953 | indexes.push_back(i); |
ffe743ca | 12954 | else |
2c809f8f | 12955 | indexes.push_back(*pi); |
e440a328 | 12956 | if (*pv == NULL) |
63697958 | 12957 | { |
63697958 | 12958 | Btype* ebtype = element_type->get_backend(gogo); |
12959 | Bexpression *zv = gogo->backend()->zero_expression(ebtype); | |
2c809f8f | 12960 | vals.push_back(zv); |
63697958 | 12961 | } |
e440a328 | 12962 | else |
12963 | { | |
2c809f8f | 12964 | Expression* val_expr = |
12965 | Expression::convert_for_assignment(gogo, element_type, *pv, | |
12966 | this->location()); | |
ea664253 | 12967 | vals.push_back(val_expr->get_backend(context)); |
e440a328 | 12968 | } |
ffe743ca | 12969 | if (this->indexes_ != NULL) |
12970 | ++pi; | |
e440a328 | 12971 | } |
ffe743ca | 12972 | if (this->indexes_ != NULL) |
12973 | go_assert(pi == this->indexes_->end()); | |
e440a328 | 12974 | } |
2c809f8f | 12975 | return gogo->backend()->array_constructor_expression(array_btype, indexes, |
12976 | vals, this->location()); | |
e440a328 | 12977 | } |
12978 | ||
12979 | // Export an array construction. | |
12980 | ||
12981 | void | |
12982 | Array_construction_expression::do_export(Export* exp) const | |
12983 | { | |
12984 | exp->write_c_string("convert("); | |
12985 | exp->write_type(this->type_); | |
e32de7ba | 12986 | if (this->vals() != NULL) |
e440a328 | 12987 | { |
ffe743ca | 12988 | std::vector<unsigned long>::const_iterator pi; |
12989 | if (this->indexes_ != NULL) | |
12990 | pi = this->indexes_->begin(); | |
e32de7ba | 12991 | for (Expression_list::const_iterator pv = this->vals()->begin(); |
12992 | pv != this->vals()->end(); | |
e440a328 | 12993 | ++pv) |
12994 | { | |
12995 | exp->write_c_string(", "); | |
ffe743ca | 12996 | |
12997 | if (this->indexes_ != NULL) | |
12998 | { | |
12999 | char buf[100]; | |
13000 | snprintf(buf, sizeof buf, "%lu", *pi); | |
13001 | exp->write_c_string(buf); | |
13002 | exp->write_c_string(":"); | |
13003 | } | |
13004 | ||
e440a328 | 13005 | if (*pv != NULL) |
13006 | (*pv)->export_expression(exp); | |
ffe743ca | 13007 | |
13008 | if (this->indexes_ != NULL) | |
13009 | ++pi; | |
e440a328 | 13010 | } |
13011 | } | |
13012 | exp->write_c_string(")"); | |
13013 | } | |
13014 | ||
0e9a2e72 | 13015 | // Dump ast representation of an array construction expression. |
d751bb78 | 13016 | |
13017 | void | |
13018 | Array_construction_expression::do_dump_expression( | |
13019 | Ast_dump_context* ast_dump_context) const | |
13020 | { | |
ffe743ca | 13021 | Expression* length = this->type_->array_type()->length(); |
8b1c301d | 13022 | |
13023 | ast_dump_context->ostream() << "[" ; | |
13024 | if (length != NULL) | |
13025 | { | |
13026 | ast_dump_context->dump_expression(length); | |
13027 | } | |
13028 | ast_dump_context->ostream() << "]" ; | |
d751bb78 | 13029 | ast_dump_context->dump_type(this->type_); |
0e9a2e72 | 13030 | this->dump_slice_storage_expression(ast_dump_context); |
d751bb78 | 13031 | ast_dump_context->ostream() << "{" ; |
ffe743ca | 13032 | if (this->indexes_ == NULL) |
e32de7ba | 13033 | ast_dump_context->dump_expression_list(this->vals()); |
ffe743ca | 13034 | else |
13035 | { | |
e32de7ba | 13036 | Expression_list::const_iterator pv = this->vals()->begin(); |
ffe743ca | 13037 | for (std::vector<unsigned long>::const_iterator pi = |
13038 | this->indexes_->begin(); | |
13039 | pi != this->indexes_->end(); | |
13040 | ++pi, ++pv) | |
13041 | { | |
13042 | if (pi != this->indexes_->begin()) | |
13043 | ast_dump_context->ostream() << ", "; | |
13044 | ast_dump_context->ostream() << *pi << ':'; | |
13045 | ast_dump_context->dump_expression(*pv); | |
13046 | } | |
13047 | } | |
d751bb78 | 13048 | ast_dump_context->ostream() << "}" ; |
13049 | ||
13050 | } | |
13051 | ||
da244e59 | 13052 | // Class Fixed_array_construction_expression. |
e440a328 | 13053 | |
da244e59 | 13054 | Fixed_array_construction_expression::Fixed_array_construction_expression( |
13055 | Type* type, const std::vector<unsigned long>* indexes, | |
13056 | Expression_list* vals, Location location) | |
13057 | : Array_construction_expression(EXPRESSION_FIXED_ARRAY_CONSTRUCTION, | |
13058 | type, indexes, vals, location) | |
13059 | { go_assert(type->array_type() != NULL && !type->is_slice_type()); } | |
e440a328 | 13060 | |
ea664253 | 13061 | // Return the backend representation for constructing a fixed array. |
e440a328 | 13062 | |
ea664253 | 13063 | Bexpression* |
13064 | Fixed_array_construction_expression::do_get_backend(Translate_context* context) | |
e440a328 | 13065 | { |
9f0e0513 | 13066 | Type* type = this->type(); |
13067 | Btype* btype = type->get_backend(context->gogo()); | |
ea664253 | 13068 | return this->get_constructor(context, btype); |
e440a328 | 13069 | } |
13070 | ||
76f85fd6 | 13071 | Expression* |
13072 | Expression::make_array_composite_literal(Type* type, Expression_list* vals, | |
13073 | Location location) | |
13074 | { | |
13075 | go_assert(type->array_type() != NULL && !type->is_slice_type()); | |
13076 | return new Fixed_array_construction_expression(type, NULL, vals, location); | |
13077 | } | |
13078 | ||
da244e59 | 13079 | // Class Slice_construction_expression. |
e440a328 | 13080 | |
da244e59 | 13081 | Slice_construction_expression::Slice_construction_expression( |
13082 | Type* type, const std::vector<unsigned long>* indexes, | |
13083 | Expression_list* vals, Location location) | |
13084 | : Array_construction_expression(EXPRESSION_SLICE_CONSTRUCTION, | |
13085 | type, indexes, vals, location), | |
0e9a2e72 | 13086 | valtype_(NULL), array_val_(NULL), slice_storage_(NULL), |
13087 | storage_escapes_(true) | |
e440a328 | 13088 | { |
da244e59 | 13089 | go_assert(type->is_slice_type()); |
23d77f91 | 13090 | |
da244e59 | 13091 | unsigned long lenval; |
13092 | Expression* length; | |
13093 | if (vals == NULL || vals->empty()) | |
13094 | lenval = 0; | |
13095 | else | |
13096 | { | |
13097 | if (this->indexes() == NULL) | |
13098 | lenval = vals->size(); | |
13099 | else | |
13100 | lenval = indexes->back() + 1; | |
13101 | } | |
13102 | Type* int_type = Type::lookup_integer_type("int"); | |
13103 | length = Expression::make_integer_ul(lenval, int_type, location); | |
13104 | Type* element_type = type->array_type()->element_type(); | |
6bf4793c | 13105 | Array_type* array_type = Type::make_array_type(element_type, length); |
13106 | array_type->set_is_array_incomparable(); | |
13107 | this->valtype_ = array_type; | |
da244e59 | 13108 | } |
e440a328 | 13109 | |
23d77f91 | 13110 | // Traversal. |
13111 | ||
13112 | int | |
13113 | Slice_construction_expression::do_traverse(Traverse* traverse) | |
13114 | { | |
13115 | if (this->Array_construction_expression::do_traverse(traverse) | |
13116 | == TRAVERSE_EXIT) | |
13117 | return TRAVERSE_EXIT; | |
13118 | if (Type::traverse(this->valtype_, traverse) == TRAVERSE_EXIT) | |
13119 | return TRAVERSE_EXIT; | |
0e9a2e72 | 13120 | if (this->array_val_ != NULL |
13121 | && Expression::traverse(&this->array_val_, traverse) == TRAVERSE_EXIT) | |
13122 | return TRAVERSE_EXIT; | |
13123 | if (this->slice_storage_ != NULL | |
13124 | && Expression::traverse(&this->slice_storage_, traverse) == TRAVERSE_EXIT) | |
13125 | return TRAVERSE_EXIT; | |
23d77f91 | 13126 | return TRAVERSE_CONTINUE; |
13127 | } | |
13128 | ||
0e9a2e72 | 13129 | // Helper routine to create fixed array value underlying the slice literal. |
13130 | // May be called during flattening, or later during do_get_backend(). | |
e440a328 | 13131 | |
0e9a2e72 | 13132 | Expression* |
13133 | Slice_construction_expression::create_array_val() | |
e440a328 | 13134 | { |
f9c68f17 | 13135 | Array_type* array_type = this->type()->array_type(); |
13136 | if (array_type == NULL) | |
13137 | { | |
c484d925 | 13138 | go_assert(this->type()->is_error()); |
0e9a2e72 | 13139 | return NULL; |
f9c68f17 | 13140 | } |
13141 | ||
f23d7786 | 13142 | Location loc = this->location(); |
23d77f91 | 13143 | go_assert(this->valtype_ != NULL); |
3d60812e | 13144 | |
f23d7786 | 13145 | Expression_list* vals = this->vals(); |
0e9a2e72 | 13146 | return new Fixed_array_construction_expression( |
13147 | this->valtype_, this->indexes(), vals, loc); | |
13148 | } | |
13149 | ||
13150 | // If we're previous established that the slice storage does not | |
13151 | // escape, then create a separate array temp val here for it. We | |
13152 | // need to do this as part of flattening so as to be able to insert | |
13153 | // the new temp statement. | |
13154 | ||
13155 | Expression* | |
13156 | Slice_construction_expression::do_flatten(Gogo* gogo, Named_object* no, | |
13157 | Statement_inserter* inserter) | |
13158 | { | |
13159 | if (this->type()->array_type() == NULL) | |
13160 | return NULL; | |
13161 | ||
13162 | // Base class flattening first | |
13163 | this->Array_construction_expression::do_flatten(gogo, no, inserter); | |
13164 | ||
a1bbc2c3 | 13165 | // Create a stack-allocated storage temp if storage won't escape |
03118c21 | 13166 | if (!this->storage_escapes_ |
13167 | && this->slice_storage_ == NULL | |
13168 | && this->element_count() > 0) | |
0e9a2e72 | 13169 | { |
13170 | Location loc = this->location(); | |
03118c21 | 13171 | this->array_val_ = this->create_array_val(); |
0e9a2e72 | 13172 | go_assert(this->array_val_); |
13173 | Temporary_statement* temp = | |
13174 | Statement::make_temporary(this->valtype_, this->array_val_, loc); | |
13175 | inserter->insert(temp); | |
13176 | this->slice_storage_ = Expression::make_temporary_reference(temp, loc); | |
13177 | } | |
13178 | return this; | |
13179 | } | |
13180 | ||
13181 | // When dumping a slice construction expression that has an explicit | |
13182 | // storeage temp, emit the temp here (if we don't do this the storage | |
13183 | // temp appears unused in the AST dump). | |
13184 | ||
13185 | void | |
13186 | Slice_construction_expression:: | |
13187 | dump_slice_storage_expression(Ast_dump_context* ast_dump_context) const | |
13188 | { | |
13189 | if (this->slice_storage_ == NULL) | |
13190 | return; | |
13191 | ast_dump_context->ostream() << "storage=" ; | |
13192 | ast_dump_context->dump_expression(this->slice_storage_); | |
13193 | } | |
13194 | ||
13195 | // Return the backend representation for constructing a slice. | |
13196 | ||
13197 | Bexpression* | |
13198 | Slice_construction_expression::do_get_backend(Translate_context* context) | |
13199 | { | |
13200 | if (this->array_val_ == NULL) | |
03118c21 | 13201 | this->array_val_ = this->create_array_val(); |
0e9a2e72 | 13202 | if (this->array_val_ == NULL) |
13203 | { | |
13204 | go_assert(this->type()->is_error()); | |
13205 | return context->backend()->error_expression(); | |
13206 | } | |
13207 | ||
13208 | Location loc = this->location(); | |
e440a328 | 13209 | |
3ae06f68 | 13210 | bool is_static_initializer = this->array_val_->is_static_initializer(); |
d8829beb | 13211 | |
13212 | // We have to copy the initial values into heap memory if we are in | |
3ae06f68 | 13213 | // a function or if the values are not constants. |
13214 | bool copy_to_heap = context->function() != NULL || !is_static_initializer; | |
e440a328 | 13215 | |
f23d7786 | 13216 | Expression* space; |
0e9a2e72 | 13217 | |
13218 | if (this->slice_storage_ != NULL) | |
13219 | { | |
13220 | go_assert(!this->storage_escapes_); | |
13221 | space = Expression::make_unary(OPERATOR_AND, this->slice_storage_, loc); | |
13222 | } | |
13223 | else if (!copy_to_heap) | |
e440a328 | 13224 | { |
f23d7786 | 13225 | // The initializer will only run once. |
0e9a2e72 | 13226 | space = Expression::make_unary(OPERATOR_AND, this->array_val_, loc); |
f23d7786 | 13227 | space->unary_expression()->set_is_slice_init(); |
e440a328 | 13228 | } |
13229 | else | |
45ff893b | 13230 | { |
0e9a2e72 | 13231 | space = Expression::make_heap_expression(this->array_val_, loc); |
45ff893b | 13232 | Node* n = Node::make_node(this); |
13233 | if ((n->encoding() & ESCAPE_MASK) == int(Node::ESCAPE_NONE)) | |
13234 | { | |
13235 | n = Node::make_node(space); | |
13236 | n->set_encoding(Node::ESCAPE_NONE); | |
13237 | } | |
13238 | } | |
e440a328 | 13239 | |
2c809f8f | 13240 | // Build a constructor for the slice. |
f23d7786 | 13241 | Expression* len = this->valtype_->array_type()->length(); |
13242 | Expression* slice_val = | |
13243 | Expression::make_slice_value(this->type(), space, len, len, loc); | |
ea664253 | 13244 | return slice_val->get_backend(context); |
e440a328 | 13245 | } |
13246 | ||
13247 | // Make a slice composite literal. This is used by the type | |
13248 | // descriptor code. | |
13249 | ||
0e9a2e72 | 13250 | Slice_construction_expression* |
e440a328 | 13251 | Expression::make_slice_composite_literal(Type* type, Expression_list* vals, |
b13c66cd | 13252 | Location location) |
e440a328 | 13253 | { |
411eb89e | 13254 | go_assert(type->is_slice_type()); |
2c809f8f | 13255 | return new Slice_construction_expression(type, NULL, vals, location); |
e440a328 | 13256 | } |
13257 | ||
da244e59 | 13258 | // Class Map_construction_expression. |
e440a328 | 13259 | |
13260 | // Traversal. | |
13261 | ||
13262 | int | |
13263 | Map_construction_expression::do_traverse(Traverse* traverse) | |
13264 | { | |
13265 | if (this->vals_ != NULL | |
13266 | && this->vals_->traverse(traverse) == TRAVERSE_EXIT) | |
13267 | return TRAVERSE_EXIT; | |
13268 | if (Type::traverse(this->type_, traverse) == TRAVERSE_EXIT) | |
13269 | return TRAVERSE_EXIT; | |
13270 | return TRAVERSE_CONTINUE; | |
13271 | } | |
13272 | ||
2c809f8f | 13273 | // Flatten constructor initializer into a temporary variable since |
13274 | // we need to take its address for __go_construct_map. | |
13275 | ||
13276 | Expression* | |
13277 | Map_construction_expression::do_flatten(Gogo* gogo, Named_object*, | |
13278 | Statement_inserter* inserter) | |
13279 | { | |
13280 | if (!this->is_error_expression() | |
13281 | && this->vals_ != NULL | |
13282 | && !this->vals_->empty() | |
13283 | && this->constructor_temp_ == NULL) | |
13284 | { | |
13285 | Map_type* mt = this->type_->map_type(); | |
13286 | Type* key_type = mt->key_type(); | |
13287 | Type* val_type = mt->val_type(); | |
13288 | this->element_type_ = Type::make_builtin_struct_type(2, | |
13289 | "__key", key_type, | |
13290 | "__val", val_type); | |
13291 | ||
13292 | Expression_list* value_pairs = new Expression_list(); | |
13293 | Location loc = this->location(); | |
13294 | ||
13295 | size_t i = 0; | |
13296 | for (Expression_list::const_iterator pv = this->vals_->begin(); | |
13297 | pv != this->vals_->end(); | |
13298 | ++pv, ++i) | |
13299 | { | |
13300 | Expression_list* key_value_pair = new Expression_list(); | |
91c0fd76 | 13301 | Expression* key = *pv; |
5bf8be8b | 13302 | if (key->is_error_expression() || key->type()->is_error_type()) |
13303 | { | |
13304 | go_assert(saw_errors()); | |
13305 | return Expression::make_error(loc); | |
13306 | } | |
91c0fd76 | 13307 | if (key->type()->interface_type() != NULL && !key->is_variable()) |
13308 | { | |
13309 | Temporary_statement* temp = | |
13310 | Statement::make_temporary(NULL, key, loc); | |
13311 | inserter->insert(temp); | |
13312 | key = Expression::make_temporary_reference(temp, loc); | |
13313 | } | |
13314 | key = Expression::convert_for_assignment(gogo, key_type, key, loc); | |
2c809f8f | 13315 | |
13316 | ++pv; | |
91c0fd76 | 13317 | Expression* val = *pv; |
5bf8be8b | 13318 | if (val->is_error_expression() || val->type()->is_error_type()) |
13319 | { | |
13320 | go_assert(saw_errors()); | |
13321 | return Expression::make_error(loc); | |
13322 | } | |
91c0fd76 | 13323 | if (val->type()->interface_type() != NULL && !val->is_variable()) |
13324 | { | |
13325 | Temporary_statement* temp = | |
13326 | Statement::make_temporary(NULL, val, loc); | |
13327 | inserter->insert(temp); | |
13328 | val = Expression::make_temporary_reference(temp, loc); | |
13329 | } | |
13330 | val = Expression::convert_for_assignment(gogo, val_type, val, loc); | |
2c809f8f | 13331 | |
13332 | key_value_pair->push_back(key); | |
13333 | key_value_pair->push_back(val); | |
13334 | value_pairs->push_back( | |
13335 | Expression::make_struct_composite_literal(this->element_type_, | |
13336 | key_value_pair, loc)); | |
13337 | } | |
13338 | ||
e67508fa | 13339 | Expression* element_count = Expression::make_integer_ul(i, NULL, loc); |
6bf4793c | 13340 | Array_type* ctor_type = |
2c809f8f | 13341 | Type::make_array_type(this->element_type_, element_count); |
6bf4793c | 13342 | ctor_type->set_is_array_incomparable(); |
2c809f8f | 13343 | Expression* constructor = |
13344 | new Fixed_array_construction_expression(ctor_type, NULL, | |
13345 | value_pairs, loc); | |
13346 | ||
13347 | this->constructor_temp_ = | |
13348 | Statement::make_temporary(NULL, constructor, loc); | |
13349 | constructor->issue_nil_check(); | |
13350 | this->constructor_temp_->set_is_address_taken(); | |
13351 | inserter->insert(this->constructor_temp_); | |
13352 | } | |
13353 | ||
13354 | return this; | |
13355 | } | |
13356 | ||
e440a328 | 13357 | // Final type determination. |
13358 | ||
13359 | void | |
13360 | Map_construction_expression::do_determine_type(const Type_context*) | |
13361 | { | |
13362 | if (this->vals_ == NULL) | |
13363 | return; | |
13364 | ||
13365 | Map_type* mt = this->type_->map_type(); | |
13366 | Type_context key_context(mt->key_type(), false); | |
13367 | Type_context val_context(mt->val_type(), false); | |
13368 | for (Expression_list::const_iterator pv = this->vals_->begin(); | |
13369 | pv != this->vals_->end(); | |
13370 | ++pv) | |
13371 | { | |
13372 | (*pv)->determine_type(&key_context); | |
13373 | ++pv; | |
13374 | (*pv)->determine_type(&val_context); | |
13375 | } | |
13376 | } | |
13377 | ||
13378 | // Check types. | |
13379 | ||
13380 | void | |
13381 | Map_construction_expression::do_check_types(Gogo*) | |
13382 | { | |
13383 | if (this->vals_ == NULL) | |
13384 | return; | |
13385 | ||
13386 | Map_type* mt = this->type_->map_type(); | |
13387 | int i = 0; | |
13388 | Type* key_type = mt->key_type(); | |
13389 | Type* val_type = mt->val_type(); | |
13390 | for (Expression_list::const_iterator pv = this->vals_->begin(); | |
13391 | pv != this->vals_->end(); | |
13392 | ++pv, ++i) | |
13393 | { | |
13394 | if (!Type::are_assignable(key_type, (*pv)->type(), NULL)) | |
13395 | { | |
631d5788 | 13396 | go_error_at((*pv)->location(), |
13397 | "incompatible type for element %d key in map construction", | |
13398 | i + 1); | |
e440a328 | 13399 | this->set_is_error(); |
13400 | } | |
13401 | ++pv; | |
13402 | if (!Type::are_assignable(val_type, (*pv)->type(), NULL)) | |
13403 | { | |
631d5788 | 13404 | go_error_at((*pv)->location(), |
13405 | ("incompatible type for element %d value " | |
13406 | "in map construction"), | |
e440a328 | 13407 | i + 1); |
13408 | this->set_is_error(); | |
13409 | } | |
13410 | } | |
13411 | } | |
13412 | ||
ea664253 | 13413 | // Return the backend representation for constructing a map. |
e440a328 | 13414 | |
ea664253 | 13415 | Bexpression* |
13416 | Map_construction_expression::do_get_backend(Translate_context* context) | |
e440a328 | 13417 | { |
2c809f8f | 13418 | if (this->is_error_expression()) |
ea664253 | 13419 | return context->backend()->error_expression(); |
2c809f8f | 13420 | Location loc = this->location(); |
e440a328 | 13421 | |
e440a328 | 13422 | size_t i = 0; |
2c809f8f | 13423 | Expression* ventries; |
e440a328 | 13424 | if (this->vals_ == NULL || this->vals_->empty()) |
2c809f8f | 13425 | ventries = Expression::make_nil(loc); |
e440a328 | 13426 | else |
13427 | { | |
2c809f8f | 13428 | go_assert(this->constructor_temp_ != NULL); |
13429 | i = this->vals_->size() / 2; | |
e440a328 | 13430 | |
2c809f8f | 13431 | Expression* ctor_ref = |
13432 | Expression::make_temporary_reference(this->constructor_temp_, loc); | |
13433 | ventries = Expression::make_unary(OPERATOR_AND, ctor_ref, loc); | |
13434 | } | |
e440a328 | 13435 | |
2c809f8f | 13436 | Map_type* mt = this->type_->map_type(); |
13437 | if (this->element_type_ == NULL) | |
13438 | this->element_type_ = | |
13439 | Type::make_builtin_struct_type(2, | |
13440 | "__key", mt->key_type(), | |
13441 | "__val", mt->val_type()); | |
0d5530d9 | 13442 | Expression* descriptor = Expression::make_type_descriptor(mt, loc); |
2c809f8f | 13443 | |
13444 | Type* uintptr_t = Type::lookup_integer_type("uintptr"); | |
e67508fa | 13445 | Expression* count = Expression::make_integer_ul(i, uintptr_t, loc); |
2c809f8f | 13446 | |
13447 | Expression* entry_size = | |
13448 | Expression::make_type_info(this->element_type_, TYPE_INFO_SIZE); | |
13449 | ||
13450 | unsigned int field_index; | |
13451 | const Struct_field* valfield = | |
13452 | this->element_type_->find_local_field("__val", &field_index); | |
13453 | Expression* val_offset = | |
13454 | Expression::make_struct_field_offset(this->element_type_, valfield); | |
2c809f8f | 13455 | |
13456 | Expression* map_ctor = | |
0d5530d9 | 13457 | Runtime::make_call(Runtime::CONSTRUCT_MAP, loc, 5, descriptor, count, |
13458 | entry_size, val_offset, ventries); | |
ea664253 | 13459 | return map_ctor->get_backend(context); |
2c809f8f | 13460 | } |
e440a328 | 13461 | |
2c809f8f | 13462 | // Export an array construction. |
e440a328 | 13463 | |
2c809f8f | 13464 | void |
13465 | Map_construction_expression::do_export(Export* exp) const | |
13466 | { | |
13467 | exp->write_c_string("convert("); | |
13468 | exp->write_type(this->type_); | |
13469 | for (Expression_list::const_iterator pv = this->vals_->begin(); | |
13470 | pv != this->vals_->end(); | |
13471 | ++pv) | |
13472 | { | |
13473 | exp->write_c_string(", "); | |
13474 | (*pv)->export_expression(exp); | |
13475 | } | |
13476 | exp->write_c_string(")"); | |
13477 | } | |
e440a328 | 13478 | |
2c809f8f | 13479 | // Dump ast representation for a map construction expression. |
d751bb78 | 13480 | |
13481 | void | |
13482 | Map_construction_expression::do_dump_expression( | |
13483 | Ast_dump_context* ast_dump_context) const | |
13484 | { | |
d751bb78 | 13485 | ast_dump_context->ostream() << "{" ; |
8b1c301d | 13486 | ast_dump_context->dump_expression_list(this->vals_, true); |
d751bb78 | 13487 | ast_dump_context->ostream() << "}"; |
13488 | } | |
13489 | ||
7795ac51 | 13490 | // Class Composite_literal_expression. |
e440a328 | 13491 | |
13492 | // Traversal. | |
13493 | ||
13494 | int | |
13495 | Composite_literal_expression::do_traverse(Traverse* traverse) | |
13496 | { | |
dbffccfc | 13497 | if (Type::traverse(this->type_, traverse) == TRAVERSE_EXIT) |
e440a328 | 13498 | return TRAVERSE_EXIT; |
dbffccfc | 13499 | |
13500 | // If this is a struct composite literal with keys, then the keys | |
13501 | // are field names, not expressions. We don't want to traverse them | |
13502 | // in that case. If we do, we can give an erroneous error "variable | |
13503 | // initializer refers to itself." See bug482.go in the testsuite. | |
13504 | if (this->has_keys_ && this->vals_ != NULL) | |
13505 | { | |
13506 | // The type may not be resolvable at this point. | |
13507 | Type* type = this->type_; | |
a01f2481 | 13508 | |
7795ac51 | 13509 | for (int depth = 0; depth < this->depth_; ++depth) |
a01f2481 | 13510 | { |
13511 | if (type->array_type() != NULL) | |
13512 | type = type->array_type()->element_type(); | |
13513 | else if (type->map_type() != NULL) | |
7795ac51 | 13514 | { |
13515 | if (this->key_path_[depth]) | |
13516 | type = type->map_type()->key_type(); | |
13517 | else | |
13518 | type = type->map_type()->val_type(); | |
13519 | } | |
a01f2481 | 13520 | else |
13521 | { | |
13522 | // This error will be reported during lowering. | |
13523 | return TRAVERSE_CONTINUE; | |
13524 | } | |
13525 | } | |
13526 | ||
dbffccfc | 13527 | while (true) |
13528 | { | |
13529 | if (type->classification() == Type::TYPE_NAMED) | |
13530 | type = type->named_type()->real_type(); | |
13531 | else if (type->classification() == Type::TYPE_FORWARD) | |
13532 | { | |
13533 | Type* t = type->forwarded(); | |
13534 | if (t == type) | |
13535 | break; | |
13536 | type = t; | |
13537 | } | |
13538 | else | |
13539 | break; | |
13540 | } | |
13541 | ||
13542 | if (type->classification() == Type::TYPE_STRUCT) | |
13543 | { | |
13544 | Expression_list::iterator p = this->vals_->begin(); | |
13545 | while (p != this->vals_->end()) | |
13546 | { | |
13547 | // Skip key. | |
13548 | ++p; | |
13549 | go_assert(p != this->vals_->end()); | |
13550 | if (Expression::traverse(&*p, traverse) == TRAVERSE_EXIT) | |
13551 | return TRAVERSE_EXIT; | |
13552 | ++p; | |
13553 | } | |
13554 | return TRAVERSE_CONTINUE; | |
13555 | } | |
13556 | } | |
13557 | ||
13558 | if (this->vals_ != NULL) | |
13559 | return this->vals_->traverse(traverse); | |
13560 | ||
13561 | return TRAVERSE_CONTINUE; | |
e440a328 | 13562 | } |
13563 | ||
13564 | // Lower a generic composite literal into a specific version based on | |
13565 | // the type. | |
13566 | ||
13567 | Expression* | |
ceeb4318 | 13568 | Composite_literal_expression::do_lower(Gogo* gogo, Named_object* function, |
13569 | Statement_inserter* inserter, int) | |
e440a328 | 13570 | { |
13571 | Type* type = this->type_; | |
13572 | ||
7795ac51 | 13573 | for (int depth = 0; depth < this->depth_; ++depth) |
e440a328 | 13574 | { |
13575 | if (type->array_type() != NULL) | |
13576 | type = type->array_type()->element_type(); | |
13577 | else if (type->map_type() != NULL) | |
7795ac51 | 13578 | { |
13579 | if (this->key_path_[depth]) | |
13580 | type = type->map_type()->key_type(); | |
13581 | else | |
13582 | type = type->map_type()->val_type(); | |
13583 | } | |
e440a328 | 13584 | else |
13585 | { | |
5c13bd80 | 13586 | if (!type->is_error()) |
631d5788 | 13587 | go_error_at(this->location(), |
13588 | ("may only omit types within composite literals " | |
13589 | "of slice, array, or map type")); | |
e440a328 | 13590 | return Expression::make_error(this->location()); |
13591 | } | |
13592 | } | |
13593 | ||
e00772b3 | 13594 | Type *pt = type->points_to(); |
13595 | bool is_pointer = false; | |
13596 | if (pt != NULL) | |
13597 | { | |
13598 | is_pointer = true; | |
13599 | type = pt; | |
13600 | } | |
13601 | ||
13602 | Expression* ret; | |
5c13bd80 | 13603 | if (type->is_error()) |
e440a328 | 13604 | return Expression::make_error(this->location()); |
13605 | else if (type->struct_type() != NULL) | |
e00772b3 | 13606 | ret = this->lower_struct(gogo, type); |
e440a328 | 13607 | else if (type->array_type() != NULL) |
113ef6a5 | 13608 | ret = this->lower_array(type); |
e440a328 | 13609 | else if (type->map_type() != NULL) |
e00772b3 | 13610 | ret = this->lower_map(gogo, function, inserter, type); |
e440a328 | 13611 | else |
13612 | { | |
631d5788 | 13613 | go_error_at(this->location(), |
13614 | ("expected struct, slice, array, or map type " | |
13615 | "for composite literal")); | |
e440a328 | 13616 | return Expression::make_error(this->location()); |
13617 | } | |
e00772b3 | 13618 | |
13619 | if (is_pointer) | |
2c809f8f | 13620 | ret = Expression::make_heap_expression(ret, this->location()); |
e00772b3 | 13621 | |
13622 | return ret; | |
e440a328 | 13623 | } |
13624 | ||
13625 | // Lower a struct composite literal. | |
13626 | ||
13627 | Expression* | |
81c4b26b | 13628 | Composite_literal_expression::lower_struct(Gogo* gogo, Type* type) |
e440a328 | 13629 | { |
b13c66cd | 13630 | Location location = this->location(); |
e440a328 | 13631 | Struct_type* st = type->struct_type(); |
13632 | if (this->vals_ == NULL || !this->has_keys_) | |
07daa4e7 | 13633 | { |
e6013c28 | 13634 | if (this->vals_ != NULL |
13635 | && !this->vals_->empty() | |
13636 | && type->named_type() != NULL | |
13637 | && type->named_type()->named_object()->package() != NULL) | |
13638 | { | |
13639 | for (Struct_field_list::const_iterator pf = st->fields()->begin(); | |
13640 | pf != st->fields()->end(); | |
13641 | ++pf) | |
07daa4e7 | 13642 | { |
07ba7f26 | 13643 | if (Gogo::is_hidden_name(pf->field_name()) |
13644 | || pf->is_embedded_builtin(gogo)) | |
631d5788 | 13645 | go_error_at(this->location(), |
13646 | "assignment of unexported field %qs in %qs literal", | |
13647 | Gogo::message_name(pf->field_name()).c_str(), | |
13648 | type->named_type()->message_name().c_str()); | |
07daa4e7 | 13649 | } |
13650 | } | |
13651 | ||
13652 | return new Struct_construction_expression(type, this->vals_, location); | |
13653 | } | |
e440a328 | 13654 | |
13655 | size_t field_count = st->field_count(); | |
13656 | std::vector<Expression*> vals(field_count); | |
e32de7ba | 13657 | std::vector<unsigned long>* traverse_order = new(std::vector<unsigned long>); |
e440a328 | 13658 | Expression_list::const_iterator p = this->vals_->begin(); |
62750cd5 | 13659 | Expression* external_expr = NULL; |
13660 | const Named_object* external_no = NULL; | |
e440a328 | 13661 | while (p != this->vals_->end()) |
13662 | { | |
13663 | Expression* name_expr = *p; | |
13664 | ||
13665 | ++p; | |
c484d925 | 13666 | go_assert(p != this->vals_->end()); |
e440a328 | 13667 | Expression* val = *p; |
13668 | ||
13669 | ++p; | |
13670 | ||
13671 | if (name_expr == NULL) | |
13672 | { | |
631d5788 | 13673 | go_error_at(val->location(), |
13674 | "mixture of field and value initializers"); | |
e440a328 | 13675 | return Expression::make_error(location); |
13676 | } | |
13677 | ||
13678 | bool bad_key = false; | |
13679 | std::string name; | |
81c4b26b | 13680 | const Named_object* no = NULL; |
e440a328 | 13681 | switch (name_expr->classification()) |
13682 | { | |
13683 | case EXPRESSION_UNKNOWN_REFERENCE: | |
13684 | name = name_expr->unknown_expression()->name(); | |
7f7ce694 | 13685 | if (type->named_type() != NULL) |
13686 | { | |
13687 | // If the named object found for this field name comes from a | |
13688 | // different package than the struct it is a part of, do not count | |
13689 | // this incorrect lookup as a usage of the object's package. | |
13690 | no = name_expr->unknown_expression()->named_object(); | |
13691 | if (no->package() != NULL | |
13692 | && no->package() != type->named_type()->named_object()->package()) | |
13693 | no->package()->forget_usage(name_expr); | |
13694 | } | |
e440a328 | 13695 | break; |
13696 | ||
13697 | case EXPRESSION_CONST_REFERENCE: | |
81c4b26b | 13698 | no = static_cast<Const_expression*>(name_expr)->named_object(); |
e440a328 | 13699 | break; |
13700 | ||
13701 | case EXPRESSION_TYPE: | |
13702 | { | |
13703 | Type* t = name_expr->type(); | |
13704 | Named_type* nt = t->named_type(); | |
13705 | if (nt == NULL) | |
13706 | bad_key = true; | |
13707 | else | |
81c4b26b | 13708 | no = nt->named_object(); |
e440a328 | 13709 | } |
13710 | break; | |
13711 | ||
13712 | case EXPRESSION_VAR_REFERENCE: | |
81c4b26b | 13713 | no = name_expr->var_expression()->named_object(); |
e440a328 | 13714 | break; |
13715 | ||
b0c09712 | 13716 | case EXPRESSION_ENCLOSED_VAR_REFERENCE: |
13717 | no = name_expr->enclosed_var_expression()->variable(); | |
e440a328 | 13718 | break; |
13719 | ||
b0c09712 | 13720 | case EXPRESSION_FUNC_REFERENCE: |
13721 | no = name_expr->func_expression()->named_object(); | |
e440a328 | 13722 | break; |
13723 | ||
13724 | default: | |
13725 | bad_key = true; | |
13726 | break; | |
13727 | } | |
13728 | if (bad_key) | |
13729 | { | |
631d5788 | 13730 | go_error_at(name_expr->location(), "expected struct field name"); |
e440a328 | 13731 | return Expression::make_error(location); |
13732 | } | |
13733 | ||
81c4b26b | 13734 | if (no != NULL) |
13735 | { | |
62750cd5 | 13736 | if (no->package() != NULL && external_expr == NULL) |
13737 | { | |
13738 | external_expr = name_expr; | |
13739 | external_no = no; | |
13740 | } | |
13741 | ||
81c4b26b | 13742 | name = no->name(); |
13743 | ||
13744 | // A predefined name won't be packed. If it starts with a | |
13745 | // lower case letter we need to check for that case, because | |
2d29d278 | 13746 | // the field name will be packed. FIXME. |
81c4b26b | 13747 | if (!Gogo::is_hidden_name(name) |
13748 | && name[0] >= 'a' | |
13749 | && name[0] <= 'z') | |
13750 | { | |
13751 | Named_object* gno = gogo->lookup_global(name.c_str()); | |
13752 | if (gno == no) | |
13753 | name = gogo->pack_hidden_name(name, false); | |
13754 | } | |
13755 | } | |
13756 | ||
e440a328 | 13757 | unsigned int index; |
13758 | const Struct_field* sf = st->find_local_field(name, &index); | |
13759 | if (sf == NULL) | |
13760 | { | |
631d5788 | 13761 | go_error_at(name_expr->location(), "unknown field %qs in %qs", |
13762 | Gogo::message_name(name).c_str(), | |
13763 | (type->named_type() != NULL | |
13764 | ? type->named_type()->message_name().c_str() | |
13765 | : "unnamed struct")); | |
e440a328 | 13766 | return Expression::make_error(location); |
13767 | } | |
13768 | if (vals[index] != NULL) | |
13769 | { | |
631d5788 | 13770 | go_error_at(name_expr->location(), |
13771 | "duplicate value for field %qs in %qs", | |
13772 | Gogo::message_name(name).c_str(), | |
13773 | (type->named_type() != NULL | |
13774 | ? type->named_type()->message_name().c_str() | |
13775 | : "unnamed struct")); | |
e440a328 | 13776 | return Expression::make_error(location); |
13777 | } | |
13778 | ||
07daa4e7 | 13779 | if (type->named_type() != NULL |
13780 | && type->named_type()->named_object()->package() != NULL | |
07ba7f26 | 13781 | && (Gogo::is_hidden_name(sf->field_name()) |
13782 | || sf->is_embedded_builtin(gogo))) | |
631d5788 | 13783 | go_error_at(name_expr->location(), |
13784 | "assignment of unexported field %qs in %qs literal", | |
13785 | Gogo::message_name(sf->field_name()).c_str(), | |
13786 | type->named_type()->message_name().c_str()); | |
07daa4e7 | 13787 | |
e440a328 | 13788 | vals[index] = val; |
e32de7ba | 13789 | traverse_order->push_back(static_cast<unsigned long>(index)); |
e440a328 | 13790 | } |
13791 | ||
62750cd5 | 13792 | if (!this->all_are_names_) |
13793 | { | |
13794 | // This is a weird case like bug462 in the testsuite. | |
13795 | if (external_expr == NULL) | |
631d5788 | 13796 | go_error_at(this->location(), "unknown field in %qs literal", |
13797 | (type->named_type() != NULL | |
13798 | ? type->named_type()->message_name().c_str() | |
13799 | : "unnamed struct")); | |
62750cd5 | 13800 | else |
631d5788 | 13801 | go_error_at(external_expr->location(), "unknown field %qs in %qs", |
13802 | external_no->message_name().c_str(), | |
13803 | (type->named_type() != NULL | |
13804 | ? type->named_type()->message_name().c_str() | |
13805 | : "unnamed struct")); | |
62750cd5 | 13806 | return Expression::make_error(location); |
13807 | } | |
13808 | ||
e440a328 | 13809 | Expression_list* list = new Expression_list; |
13810 | list->reserve(field_count); | |
13811 | for (size_t i = 0; i < field_count; ++i) | |
13812 | list->push_back(vals[i]); | |
13813 | ||
0c4f5a19 | 13814 | Struct_construction_expression* ret = |
13815 | new Struct_construction_expression(type, list, location); | |
13816 | ret->set_traverse_order(traverse_order); | |
13817 | return ret; | |
e440a328 | 13818 | } |
13819 | ||
e32de7ba | 13820 | // Index/value/traversal-order triple. |
00773463 | 13821 | |
e32de7ba | 13822 | struct IVT_triple { |
13823 | unsigned long index; | |
13824 | unsigned long traversal_order; | |
13825 | Expression* expr; | |
13826 | IVT_triple(unsigned long i, unsigned long to, Expression *e) | |
13827 | : index(i), traversal_order(to), expr(e) { } | |
13828 | bool operator<(const IVT_triple& other) const | |
13829 | { return this->index < other.index; } | |
00773463 | 13830 | }; |
13831 | ||
e440a328 | 13832 | // Lower an array composite literal. |
13833 | ||
13834 | Expression* | |
113ef6a5 | 13835 | Composite_literal_expression::lower_array(Type* type) |
e440a328 | 13836 | { |
b13c66cd | 13837 | Location location = this->location(); |
e440a328 | 13838 | if (this->vals_ == NULL || !this->has_keys_) |
ffe743ca | 13839 | return this->make_array(type, NULL, this->vals_); |
e440a328 | 13840 | |
ffe743ca | 13841 | std::vector<unsigned long>* indexes = new std::vector<unsigned long>; |
13842 | indexes->reserve(this->vals_->size()); | |
00773463 | 13843 | bool indexes_out_of_order = false; |
ffe743ca | 13844 | Expression_list* vals = new Expression_list(); |
13845 | vals->reserve(this->vals_->size()); | |
e440a328 | 13846 | unsigned long index = 0; |
13847 | Expression_list::const_iterator p = this->vals_->begin(); | |
13848 | while (p != this->vals_->end()) | |
13849 | { | |
13850 | Expression* index_expr = *p; | |
13851 | ||
13852 | ++p; | |
c484d925 | 13853 | go_assert(p != this->vals_->end()); |
e440a328 | 13854 | Expression* val = *p; |
13855 | ||
13856 | ++p; | |
13857 | ||
ffe743ca | 13858 | if (index_expr == NULL) |
13859 | { | |
13860 | if (!indexes->empty()) | |
13861 | indexes->push_back(index); | |
13862 | } | |
13863 | else | |
e440a328 | 13864 | { |
ffe743ca | 13865 | if (indexes->empty() && !vals->empty()) |
13866 | { | |
13867 | for (size_t i = 0; i < vals->size(); ++i) | |
13868 | indexes->push_back(i); | |
13869 | } | |
13870 | ||
0c77715b | 13871 | Numeric_constant nc; |
13872 | if (!index_expr->numeric_constant_value(&nc)) | |
e440a328 | 13873 | { |
631d5788 | 13874 | go_error_at(index_expr->location(), |
13875 | "index expression is not integer constant"); | |
e440a328 | 13876 | return Expression::make_error(location); |
13877 | } | |
6f6d9955 | 13878 | |
0c77715b | 13879 | switch (nc.to_unsigned_long(&index)) |
e440a328 | 13880 | { |
0c77715b | 13881 | case Numeric_constant::NC_UL_VALID: |
13882 | break; | |
13883 | case Numeric_constant::NC_UL_NOTINT: | |
631d5788 | 13884 | go_error_at(index_expr->location(), |
13885 | "index expression is not integer constant"); | |
0c77715b | 13886 | return Expression::make_error(location); |
13887 | case Numeric_constant::NC_UL_NEGATIVE: | |
631d5788 | 13888 | go_error_at(index_expr->location(), |
13889 | "index expression is negative"); | |
e440a328 | 13890 | return Expression::make_error(location); |
0c77715b | 13891 | case Numeric_constant::NC_UL_BIG: |
631d5788 | 13892 | go_error_at(index_expr->location(), "index value overflow"); |
e440a328 | 13893 | return Expression::make_error(location); |
0c77715b | 13894 | default: |
13895 | go_unreachable(); | |
e440a328 | 13896 | } |
6f6d9955 | 13897 | |
13898 | Named_type* ntype = Type::lookup_integer_type("int"); | |
13899 | Integer_type* inttype = ntype->integer_type(); | |
0c77715b | 13900 | if (sizeof(index) <= static_cast<size_t>(inttype->bits() * 8) |
13901 | && index >> (inttype->bits() - 1) != 0) | |
6f6d9955 | 13902 | { |
631d5788 | 13903 | go_error_at(index_expr->location(), "index value overflow"); |
6f6d9955 | 13904 | return Expression::make_error(location); |
13905 | } | |
13906 | ||
ffe743ca | 13907 | if (std::find(indexes->begin(), indexes->end(), index) |
13908 | != indexes->end()) | |
e440a328 | 13909 | { |
631d5788 | 13910 | go_error_at(index_expr->location(), |
13911 | "duplicate value for index %lu", | |
13912 | index); | |
e440a328 | 13913 | return Expression::make_error(location); |
13914 | } | |
ffe743ca | 13915 | |
00773463 | 13916 | if (!indexes->empty() && index < indexes->back()) |
13917 | indexes_out_of_order = true; | |
13918 | ||
ffe743ca | 13919 | indexes->push_back(index); |
e440a328 | 13920 | } |
13921 | ||
ffe743ca | 13922 | vals->push_back(val); |
13923 | ||
e440a328 | 13924 | ++index; |
13925 | } | |
13926 | ||
ffe743ca | 13927 | if (indexes->empty()) |
13928 | { | |
13929 | delete indexes; | |
13930 | indexes = NULL; | |
13931 | } | |
e440a328 | 13932 | |
e32de7ba | 13933 | std::vector<unsigned long>* traverse_order = NULL; |
00773463 | 13934 | if (indexes_out_of_order) |
13935 | { | |
e32de7ba | 13936 | typedef std::vector<IVT_triple> V; |
00773463 | 13937 | |
13938 | V v; | |
13939 | v.reserve(indexes->size()); | |
13940 | std::vector<unsigned long>::const_iterator pi = indexes->begin(); | |
e32de7ba | 13941 | unsigned long torder = 0; |
00773463 | 13942 | for (Expression_list::const_iterator pe = vals->begin(); |
13943 | pe != vals->end(); | |
e32de7ba | 13944 | ++pe, ++pi, ++torder) |
13945 | v.push_back(IVT_triple(*pi, torder, *pe)); | |
00773463 | 13946 | |
e32de7ba | 13947 | std::sort(v.begin(), v.end()); |
00773463 | 13948 | |
13949 | delete indexes; | |
13950 | delete vals; | |
e32de7ba | 13951 | |
00773463 | 13952 | indexes = new std::vector<unsigned long>(); |
13953 | indexes->reserve(v.size()); | |
13954 | vals = new Expression_list(); | |
13955 | vals->reserve(v.size()); | |
e32de7ba | 13956 | traverse_order = new std::vector<unsigned long>(); |
13957 | traverse_order->reserve(v.size()); | |
00773463 | 13958 | |
13959 | for (V::const_iterator p = v.begin(); p != v.end(); ++p) | |
13960 | { | |
e32de7ba | 13961 | indexes->push_back(p->index); |
13962 | vals->push_back(p->expr); | |
13963 | traverse_order->push_back(p->traversal_order); | |
00773463 | 13964 | } |
13965 | } | |
13966 | ||
e32de7ba | 13967 | Expression* ret = this->make_array(type, indexes, vals); |
13968 | Array_construction_expression* ace = ret->array_literal(); | |
13969 | if (ace != NULL && traverse_order != NULL) | |
13970 | ace->set_traverse_order(traverse_order); | |
13971 | return ret; | |
e440a328 | 13972 | } |
13973 | ||
13974 | // Actually build the array composite literal. This handles | |
13975 | // [...]{...}. | |
13976 | ||
13977 | Expression* | |
ffe743ca | 13978 | Composite_literal_expression::make_array( |
13979 | Type* type, | |
13980 | const std::vector<unsigned long>* indexes, | |
13981 | Expression_list* vals) | |
e440a328 | 13982 | { |
b13c66cd | 13983 | Location location = this->location(); |
e440a328 | 13984 | Array_type* at = type->array_type(); |
ffe743ca | 13985 | |
e440a328 | 13986 | if (at->length() != NULL && at->length()->is_nil_expression()) |
13987 | { | |
ffe743ca | 13988 | size_t size; |
13989 | if (vals == NULL) | |
13990 | size = 0; | |
00773463 | 13991 | else if (indexes != NULL) |
13992 | size = indexes->back() + 1; | |
13993 | else | |
ffe743ca | 13994 | { |
13995 | size = vals->size(); | |
13996 | Integer_type* it = Type::lookup_integer_type("int")->integer_type(); | |
13997 | if (sizeof(size) <= static_cast<size_t>(it->bits() * 8) | |
13998 | && size >> (it->bits() - 1) != 0) | |
13999 | { | |
631d5788 | 14000 | go_error_at(location, "too many elements in composite literal"); |
ffe743ca | 14001 | return Expression::make_error(location); |
14002 | } | |
14003 | } | |
ffe743ca | 14004 | |
e67508fa | 14005 | Expression* elen = Expression::make_integer_ul(size, NULL, location); |
e440a328 | 14006 | at = Type::make_array_type(at->element_type(), elen); |
14007 | type = at; | |
14008 | } | |
ffe743ca | 14009 | else if (at->length() != NULL |
14010 | && !at->length()->is_error_expression() | |
14011 | && this->vals_ != NULL) | |
14012 | { | |
14013 | Numeric_constant nc; | |
14014 | unsigned long val; | |
14015 | if (at->length()->numeric_constant_value(&nc) | |
14016 | && nc.to_unsigned_long(&val) == Numeric_constant::NC_UL_VALID) | |
14017 | { | |
14018 | if (indexes == NULL) | |
14019 | { | |
14020 | if (this->vals_->size() > val) | |
14021 | { | |
631d5788 | 14022 | go_error_at(location, |
14023 | "too many elements in composite literal"); | |
ffe743ca | 14024 | return Expression::make_error(location); |
14025 | } | |
14026 | } | |
14027 | else | |
14028 | { | |
00773463 | 14029 | unsigned long max = indexes->back(); |
ffe743ca | 14030 | if (max >= val) |
14031 | { | |
631d5788 | 14032 | go_error_at(location, |
14033 | ("some element keys in composite literal " | |
14034 | "are out of range")); | |
ffe743ca | 14035 | return Expression::make_error(location); |
14036 | } | |
14037 | } | |
14038 | } | |
14039 | } | |
14040 | ||
e440a328 | 14041 | if (at->length() != NULL) |
ffe743ca | 14042 | return new Fixed_array_construction_expression(type, indexes, vals, |
14043 | location); | |
e440a328 | 14044 | else |
2c809f8f | 14045 | return new Slice_construction_expression(type, indexes, vals, location); |
e440a328 | 14046 | } |
14047 | ||
14048 | // Lower a map composite literal. | |
14049 | ||
14050 | Expression* | |
a287720d | 14051 | Composite_literal_expression::lower_map(Gogo* gogo, Named_object* function, |
ceeb4318 | 14052 | Statement_inserter* inserter, |
a287720d | 14053 | Type* type) |
e440a328 | 14054 | { |
b13c66cd | 14055 | Location location = this->location(); |
e440a328 | 14056 | if (this->vals_ != NULL) |
14057 | { | |
14058 | if (!this->has_keys_) | |
14059 | { | |
631d5788 | 14060 | go_error_at(location, "map composite literal must have keys"); |
e440a328 | 14061 | return Expression::make_error(location); |
14062 | } | |
14063 | ||
a287720d | 14064 | for (Expression_list::iterator p = this->vals_->begin(); |
e440a328 | 14065 | p != this->vals_->end(); |
14066 | p += 2) | |
14067 | { | |
14068 | if (*p == NULL) | |
14069 | { | |
14070 | ++p; | |
631d5788 | 14071 | go_error_at((*p)->location(), |
14072 | ("map composite literal must " | |
14073 | "have keys for every value")); | |
e440a328 | 14074 | return Expression::make_error(location); |
14075 | } | |
a287720d | 14076 | // Make sure we have lowered the key; it may not have been |
14077 | // lowered in order to handle keys for struct composite | |
14078 | // literals. Lower it now to get the right error message. | |
14079 | if ((*p)->unknown_expression() != NULL) | |
14080 | { | |
14081 | (*p)->unknown_expression()->clear_is_composite_literal_key(); | |
ceeb4318 | 14082 | gogo->lower_expression(function, inserter, &*p); |
c484d925 | 14083 | go_assert((*p)->is_error_expression()); |
a287720d | 14084 | return Expression::make_error(location); |
14085 | } | |
e440a328 | 14086 | } |
14087 | } | |
14088 | ||
14089 | return new Map_construction_expression(type, this->vals_, location); | |
14090 | } | |
14091 | ||
d751bb78 | 14092 | // Dump ast representation for a composite literal expression. |
14093 | ||
14094 | void | |
14095 | Composite_literal_expression::do_dump_expression( | |
14096 | Ast_dump_context* ast_dump_context) const | |
14097 | { | |
8b1c301d | 14098 | ast_dump_context->ostream() << "composite("; |
d751bb78 | 14099 | ast_dump_context->dump_type(this->type_); |
14100 | ast_dump_context->ostream() << ", {"; | |
8b1c301d | 14101 | ast_dump_context->dump_expression_list(this->vals_, this->has_keys_); |
d751bb78 | 14102 | ast_dump_context->ostream() << "})"; |
14103 | } | |
14104 | ||
e440a328 | 14105 | // Make a composite literal expression. |
14106 | ||
14107 | Expression* | |
14108 | Expression::make_composite_literal(Type* type, int depth, bool has_keys, | |
62750cd5 | 14109 | Expression_list* vals, bool all_are_names, |
b13c66cd | 14110 | Location location) |
e440a328 | 14111 | { |
14112 | return new Composite_literal_expression(type, depth, has_keys, vals, | |
62750cd5 | 14113 | all_are_names, location); |
e440a328 | 14114 | } |
14115 | ||
14116 | // Return whether this expression is a composite literal. | |
14117 | ||
14118 | bool | |
14119 | Expression::is_composite_literal() const | |
14120 | { | |
14121 | switch (this->classification_) | |
14122 | { | |
14123 | case EXPRESSION_COMPOSITE_LITERAL: | |
14124 | case EXPRESSION_STRUCT_CONSTRUCTION: | |
14125 | case EXPRESSION_FIXED_ARRAY_CONSTRUCTION: | |
2c809f8f | 14126 | case EXPRESSION_SLICE_CONSTRUCTION: |
e440a328 | 14127 | case EXPRESSION_MAP_CONSTRUCTION: |
14128 | return true; | |
14129 | default: | |
14130 | return false; | |
14131 | } | |
14132 | } | |
14133 | ||
14134 | // Return whether this expression is a composite literal which is not | |
14135 | // constant. | |
14136 | ||
14137 | bool | |
14138 | Expression::is_nonconstant_composite_literal() const | |
14139 | { | |
14140 | switch (this->classification_) | |
14141 | { | |
14142 | case EXPRESSION_STRUCT_CONSTRUCTION: | |
14143 | { | |
14144 | const Struct_construction_expression *psce = | |
14145 | static_cast<const Struct_construction_expression*>(this); | |
14146 | return !psce->is_constant_struct(); | |
14147 | } | |
14148 | case EXPRESSION_FIXED_ARRAY_CONSTRUCTION: | |
14149 | { | |
14150 | const Fixed_array_construction_expression *pace = | |
14151 | static_cast<const Fixed_array_construction_expression*>(this); | |
14152 | return !pace->is_constant_array(); | |
14153 | } | |
2c809f8f | 14154 | case EXPRESSION_SLICE_CONSTRUCTION: |
e440a328 | 14155 | { |
2c809f8f | 14156 | const Slice_construction_expression *pace = |
14157 | static_cast<const Slice_construction_expression*>(this); | |
e440a328 | 14158 | return !pace->is_constant_array(); |
14159 | } | |
14160 | case EXPRESSION_MAP_CONSTRUCTION: | |
14161 | return true; | |
14162 | default: | |
14163 | return false; | |
14164 | } | |
14165 | } | |
14166 | ||
35a54f17 | 14167 | // Return true if this is a variable or temporary_variable. |
14168 | ||
14169 | bool | |
14170 | Expression::is_variable() const | |
14171 | { | |
14172 | switch (this->classification_) | |
14173 | { | |
14174 | case EXPRESSION_VAR_REFERENCE: | |
14175 | case EXPRESSION_TEMPORARY_REFERENCE: | |
14176 | case EXPRESSION_SET_AND_USE_TEMPORARY: | |
b0c09712 | 14177 | case EXPRESSION_ENCLOSED_VAR_REFERENCE: |
35a54f17 | 14178 | return true; |
14179 | default: | |
14180 | return false; | |
14181 | } | |
14182 | } | |
14183 | ||
e440a328 | 14184 | // Return true if this is a reference to a local variable. |
14185 | ||
14186 | bool | |
14187 | Expression::is_local_variable() const | |
14188 | { | |
14189 | const Var_expression* ve = this->var_expression(); | |
14190 | if (ve == NULL) | |
14191 | return false; | |
14192 | const Named_object* no = ve->named_object(); | |
14193 | return (no->is_result_variable() | |
14194 | || (no->is_variable() && !no->var_value()->is_global())); | |
14195 | } | |
14196 | ||
14197 | // Class Type_guard_expression. | |
14198 | ||
14199 | // Traversal. | |
14200 | ||
14201 | int | |
14202 | Type_guard_expression::do_traverse(Traverse* traverse) | |
14203 | { | |
14204 | if (Expression::traverse(&this->expr_, traverse) == TRAVERSE_EXIT | |
14205 | || Type::traverse(this->type_, traverse) == TRAVERSE_EXIT) | |
14206 | return TRAVERSE_EXIT; | |
14207 | return TRAVERSE_CONTINUE; | |
14208 | } | |
14209 | ||
2c809f8f | 14210 | Expression* |
14211 | Type_guard_expression::do_flatten(Gogo*, Named_object*, | |
14212 | Statement_inserter* inserter) | |
14213 | { | |
5bf8be8b | 14214 | if (this->expr_->is_error_expression() |
14215 | || this->expr_->type()->is_error_type()) | |
14216 | { | |
14217 | go_assert(saw_errors()); | |
14218 | return Expression::make_error(this->location()); | |
14219 | } | |
14220 | ||
2c809f8f | 14221 | if (!this->expr_->is_variable()) |
14222 | { | |
14223 | Temporary_statement* temp = Statement::make_temporary(NULL, this->expr_, | |
14224 | this->location()); | |
14225 | inserter->insert(temp); | |
14226 | this->expr_ = | |
14227 | Expression::make_temporary_reference(temp, this->location()); | |
14228 | } | |
14229 | return this; | |
14230 | } | |
14231 | ||
e440a328 | 14232 | // Check types of a type guard expression. The expression must have |
14233 | // an interface type, but the actual type conversion is checked at run | |
14234 | // time. | |
14235 | ||
14236 | void | |
14237 | Type_guard_expression::do_check_types(Gogo*) | |
14238 | { | |
e440a328 | 14239 | Type* expr_type = this->expr_->type(); |
7e9da23f | 14240 | if (expr_type->interface_type() == NULL) |
f725ade8 | 14241 | { |
5c13bd80 | 14242 | if (!expr_type->is_error() && !this->type_->is_error()) |
f725ade8 | 14243 | this->report_error(_("type assertion only valid for interface types")); |
14244 | this->set_is_error(); | |
14245 | } | |
e440a328 | 14246 | else if (this->type_->interface_type() == NULL) |
14247 | { | |
14248 | std::string reason; | |
14249 | if (!expr_type->interface_type()->implements_interface(this->type_, | |
14250 | &reason)) | |
14251 | { | |
5c13bd80 | 14252 | if (!this->type_->is_error()) |
e440a328 | 14253 | { |
f725ade8 | 14254 | if (reason.empty()) |
14255 | this->report_error(_("impossible type assertion: " | |
14256 | "type does not implement interface")); | |
14257 | else | |
631d5788 | 14258 | go_error_at(this->location(), |
14259 | ("impossible type assertion: " | |
14260 | "type does not implement interface (%s)"), | |
14261 | reason.c_str()); | |
e440a328 | 14262 | } |
f725ade8 | 14263 | this->set_is_error(); |
e440a328 | 14264 | } |
14265 | } | |
14266 | } | |
14267 | ||
ea664253 | 14268 | // Return the backend representation for a type guard expression. |
e440a328 | 14269 | |
ea664253 | 14270 | Bexpression* |
14271 | Type_guard_expression::do_get_backend(Translate_context* context) | |
e440a328 | 14272 | { |
2c809f8f | 14273 | Expression* conversion; |
7e9da23f | 14274 | if (this->type_->interface_type() != NULL) |
2c809f8f | 14275 | conversion = |
14276 | Expression::convert_interface_to_interface(this->type_, this->expr_, | |
14277 | true, this->location()); | |
e440a328 | 14278 | else |
2c809f8f | 14279 | conversion = |
14280 | Expression::convert_for_assignment(context->gogo(), this->type_, | |
14281 | this->expr_, this->location()); | |
14282 | ||
ea664253 | 14283 | return conversion->get_backend(context); |
e440a328 | 14284 | } |
14285 | ||
d751bb78 | 14286 | // Dump ast representation for a type guard expression. |
14287 | ||
14288 | void | |
2c809f8f | 14289 | Type_guard_expression::do_dump_expression(Ast_dump_context* ast_dump_context) |
d751bb78 | 14290 | const |
14291 | { | |
14292 | this->expr_->dump_expression(ast_dump_context); | |
14293 | ast_dump_context->ostream() << "."; | |
14294 | ast_dump_context->dump_type(this->type_); | |
14295 | } | |
14296 | ||
e440a328 | 14297 | // Make a type guard expression. |
14298 | ||
14299 | Expression* | |
14300 | Expression::make_type_guard(Expression* expr, Type* type, | |
b13c66cd | 14301 | Location location) |
e440a328 | 14302 | { |
14303 | return new Type_guard_expression(expr, type, location); | |
14304 | } | |
14305 | ||
2c809f8f | 14306 | // Class Heap_expression. |
e440a328 | 14307 | |
da244e59 | 14308 | // Return the type of the expression stored on the heap. |
e440a328 | 14309 | |
da244e59 | 14310 | Type* |
14311 | Heap_expression::do_type() | |
14312 | { return Type::make_pointer_type(this->expr_->type()); } | |
e440a328 | 14313 | |
ea664253 | 14314 | // Return the backend representation for allocating an expression on the heap. |
e440a328 | 14315 | |
ea664253 | 14316 | Bexpression* |
14317 | Heap_expression::do_get_backend(Translate_context* context) | |
e440a328 | 14318 | { |
03118c21 | 14319 | Type* etype = this->expr_->type(); |
14320 | if (this->expr_->is_error_expression() || etype->is_error()) | |
ea664253 | 14321 | return context->backend()->error_expression(); |
2c809f8f | 14322 | |
02c19a1a | 14323 | Location loc = this->location(); |
2c809f8f | 14324 | Gogo* gogo = context->gogo(); |
02c19a1a | 14325 | Btype* btype = this->type()->get_backend(gogo); |
45ff893b | 14326 | |
03118c21 | 14327 | Expression* alloc = Expression::make_allocation(etype, loc); |
45ff893b | 14328 | Node* n = Node::make_node(this); |
14329 | if ((n->encoding() & ESCAPE_MASK) == int(Node::ESCAPE_NONE)) | |
14330 | alloc->allocation_expression()->set_allocate_on_stack(); | |
14331 | Bexpression* space = alloc->get_backend(context); | |
02c19a1a | 14332 | |
14333 | Bstatement* decl; | |
14334 | Named_object* fn = context->function(); | |
14335 | go_assert(fn != NULL); | |
14336 | Bfunction* fndecl = fn->func_value()->get_or_make_decl(gogo, fn); | |
14337 | Bvariable* space_temp = | |
14338 | gogo->backend()->temporary_variable(fndecl, context->bblock(), btype, | |
14339 | space, true, loc, &decl); | |
03118c21 | 14340 | Btype* expr_btype = etype->get_backend(gogo); |
02c19a1a | 14341 | |
ea664253 | 14342 | Bexpression* bexpr = this->expr_->get_backend(context); |
03118c21 | 14343 | |
14344 | // If this assignment needs a write barrier, call typedmemmove. We | |
14345 | // don't do this in the write barrier pass because in some cases | |
14346 | // backend conversion can introduce new Heap_expression values. | |
14347 | Bstatement* assn; | |
14348 | if (!etype->has_pointer()) | |
14349 | { | |
14350 | space = gogo->backend()->var_expression(space_temp, VE_lvalue, loc); | |
14351 | Bexpression* ref = | |
14352 | gogo->backend()->indirect_expression(expr_btype, space, true, loc); | |
14353 | assn = gogo->backend()->assignment_statement(fndecl, ref, bexpr, loc); | |
14354 | } | |
14355 | else | |
14356 | { | |
14357 | Bstatement* edecl; | |
14358 | Bvariable* btemp = | |
14359 | gogo->backend()->temporary_variable(fndecl, context->bblock(), | |
14360 | expr_btype, bexpr, true, loc, | |
14361 | &edecl); | |
14362 | Bexpression* btempref = gogo->backend()->var_expression(btemp, | |
14363 | VE_lvalue, loc); | |
14364 | Bexpression* addr = gogo->backend()->address_expression(btempref, loc); | |
14365 | ||
14366 | Expression* td = Expression::make_type_descriptor(etype, loc); | |
14367 | Type* etype_ptr = Type::make_pointer_type(etype); | |
14368 | space = gogo->backend()->var_expression(space_temp, VE_rvalue, loc); | |
14369 | Expression* elhs = Expression::make_backend(space, etype_ptr, loc); | |
14370 | Expression* erhs = Expression::make_backend(addr, etype_ptr, loc); | |
14371 | Expression* call = Runtime::make_call(Runtime::TYPEDMEMMOVE, loc, 3, | |
14372 | td, elhs, erhs); | |
14373 | Bexpression* bcall = call->get_backend(context); | |
14374 | Bstatement* s = gogo->backend()->expression_statement(fndecl, bcall); | |
14375 | assn = gogo->backend()->compound_statement(edecl, s); | |
14376 | } | |
02c19a1a | 14377 | decl = gogo->backend()->compound_statement(decl, assn); |
d4e6573e | 14378 | space = gogo->backend()->var_expression(space_temp, VE_rvalue, loc); |
ea664253 | 14379 | return gogo->backend()->compound_expression(decl, space, loc); |
e440a328 | 14380 | } |
14381 | ||
2c809f8f | 14382 | // Dump ast representation for a heap expression. |
d751bb78 | 14383 | |
14384 | void | |
2c809f8f | 14385 | Heap_expression::do_dump_expression( |
d751bb78 | 14386 | Ast_dump_context* ast_dump_context) const |
14387 | { | |
14388 | ast_dump_context->ostream() << "&("; | |
14389 | ast_dump_context->dump_expression(this->expr_); | |
14390 | ast_dump_context->ostream() << ")"; | |
14391 | } | |
14392 | ||
2c809f8f | 14393 | // Allocate an expression on the heap. |
e440a328 | 14394 | |
14395 | Expression* | |
2c809f8f | 14396 | Expression::make_heap_expression(Expression* expr, Location location) |
e440a328 | 14397 | { |
2c809f8f | 14398 | return new Heap_expression(expr, location); |
e440a328 | 14399 | } |
14400 | ||
14401 | // Class Receive_expression. | |
14402 | ||
14403 | // Return the type of a receive expression. | |
14404 | ||
14405 | Type* | |
14406 | Receive_expression::do_type() | |
14407 | { | |
e429e3bd | 14408 | if (this->is_error_expression()) |
14409 | return Type::make_error_type(); | |
e440a328 | 14410 | Channel_type* channel_type = this->channel_->type()->channel_type(); |
14411 | if (channel_type == NULL) | |
e429e3bd | 14412 | { |
14413 | this->report_error(_("expected channel")); | |
14414 | return Type::make_error_type(); | |
14415 | } | |
e440a328 | 14416 | return channel_type->element_type(); |
14417 | } | |
14418 | ||
14419 | // Check types for a receive expression. | |
14420 | ||
14421 | void | |
14422 | Receive_expression::do_check_types(Gogo*) | |
14423 | { | |
14424 | Type* type = this->channel_->type(); | |
5c13bd80 | 14425 | if (type->is_error()) |
e440a328 | 14426 | { |
e429e3bd | 14427 | go_assert(saw_errors()); |
e440a328 | 14428 | this->set_is_error(); |
14429 | return; | |
14430 | } | |
14431 | if (type->channel_type() == NULL) | |
14432 | { | |
14433 | this->report_error(_("expected channel")); | |
14434 | return; | |
14435 | } | |
14436 | if (!type->channel_type()->may_receive()) | |
14437 | { | |
14438 | this->report_error(_("invalid receive on send-only channel")); | |
14439 | return; | |
14440 | } | |
14441 | } | |
14442 | ||
2c809f8f | 14443 | // Flattening for receive expressions creates a temporary variable to store |
14444 | // received data in for receives. | |
14445 | ||
14446 | Expression* | |
14447 | Receive_expression::do_flatten(Gogo*, Named_object*, | |
14448 | Statement_inserter* inserter) | |
14449 | { | |
14450 | Channel_type* channel_type = this->channel_->type()->channel_type(); | |
14451 | if (channel_type == NULL) | |
14452 | { | |
14453 | go_assert(saw_errors()); | |
14454 | return this; | |
14455 | } | |
5bf8be8b | 14456 | else if (this->channel_->is_error_expression()) |
14457 | { | |
14458 | go_assert(saw_errors()); | |
14459 | return Expression::make_error(this->location()); | |
14460 | } | |
2c809f8f | 14461 | |
14462 | Type* element_type = channel_type->element_type(); | |
14463 | if (this->temp_receiver_ == NULL) | |
14464 | { | |
14465 | this->temp_receiver_ = Statement::make_temporary(element_type, NULL, | |
14466 | this->location()); | |
14467 | this->temp_receiver_->set_is_address_taken(); | |
14468 | inserter->insert(this->temp_receiver_); | |
14469 | } | |
14470 | ||
14471 | return this; | |
14472 | } | |
14473 | ||
ea664253 | 14474 | // Get the backend representation for a receive expression. |
e440a328 | 14475 | |
ea664253 | 14476 | Bexpression* |
14477 | Receive_expression::do_get_backend(Translate_context* context) | |
e440a328 | 14478 | { |
f24f10bb | 14479 | Location loc = this->location(); |
14480 | ||
e440a328 | 14481 | Channel_type* channel_type = this->channel_->type()->channel_type(); |
5b8368f4 | 14482 | if (channel_type == NULL) |
14483 | { | |
c484d925 | 14484 | go_assert(this->channel_->type()->is_error()); |
ea664253 | 14485 | return context->backend()->error_expression(); |
5b8368f4 | 14486 | } |
f24f10bb | 14487 | Expression* td = Expression::make_type_descriptor(channel_type, loc); |
e440a328 | 14488 | |
2c809f8f | 14489 | Expression* recv_ref = |
14490 | Expression::make_temporary_reference(this->temp_receiver_, loc); | |
14491 | Expression* recv_addr = | |
14492 | Expression::make_temporary_reference(this->temp_receiver_, loc); | |
14493 | recv_addr = Expression::make_unary(OPERATOR_AND, recv_addr, loc); | |
132ed071 | 14494 | Expression* recv = Runtime::make_call(Runtime::CHANRECV1, loc, 3, |
14495 | td, this->channel_, recv_addr); | |
ea664253 | 14496 | return Expression::make_compound(recv, recv_ref, loc)->get_backend(context); |
e440a328 | 14497 | } |
14498 | ||
d751bb78 | 14499 | // Dump ast representation for a receive expression. |
14500 | ||
14501 | void | |
14502 | Receive_expression::do_dump_expression(Ast_dump_context* ast_dump_context) const | |
14503 | { | |
14504 | ast_dump_context->ostream() << " <- " ; | |
14505 | ast_dump_context->dump_expression(channel_); | |
14506 | } | |
14507 | ||
e440a328 | 14508 | // Make a receive expression. |
14509 | ||
14510 | Receive_expression* | |
b13c66cd | 14511 | Expression::make_receive(Expression* channel, Location location) |
e440a328 | 14512 | { |
14513 | return new Receive_expression(channel, location); | |
14514 | } | |
14515 | ||
e440a328 | 14516 | // An expression which evaluates to a pointer to the type descriptor |
14517 | // of a type. | |
14518 | ||
14519 | class Type_descriptor_expression : public Expression | |
14520 | { | |
14521 | public: | |
b13c66cd | 14522 | Type_descriptor_expression(Type* type, Location location) |
e440a328 | 14523 | : Expression(EXPRESSION_TYPE_DESCRIPTOR, location), |
14524 | type_(type) | |
14525 | { } | |
14526 | ||
14527 | protected: | |
4b686186 | 14528 | int |
14529 | do_traverse(Traverse*); | |
14530 | ||
e440a328 | 14531 | Type* |
14532 | do_type() | |
14533 | { return Type::make_type_descriptor_ptr_type(); } | |
14534 | ||
f9ca30f9 | 14535 | bool |
3ae06f68 | 14536 | do_is_static_initializer() const |
f9ca30f9 | 14537 | { return true; } |
14538 | ||
e440a328 | 14539 | void |
14540 | do_determine_type(const Type_context*) | |
14541 | { } | |
14542 | ||
14543 | Expression* | |
14544 | do_copy() | |
14545 | { return this; } | |
14546 | ||
ea664253 | 14547 | Bexpression* |
14548 | do_get_backend(Translate_context* context) | |
a1d23b41 | 14549 | { |
ea664253 | 14550 | return this->type_->type_descriptor_pointer(context->gogo(), |
14551 | this->location()); | |
a1d23b41 | 14552 | } |
e440a328 | 14553 | |
d751bb78 | 14554 | void |
14555 | do_dump_expression(Ast_dump_context*) const; | |
14556 | ||
e440a328 | 14557 | private: |
14558 | // The type for which this is the descriptor. | |
14559 | Type* type_; | |
14560 | }; | |
14561 | ||
4b686186 | 14562 | int |
14563 | Type_descriptor_expression::do_traverse(Traverse* traverse) | |
14564 | { | |
14565 | if (Type::traverse(this->type_, traverse) == TRAVERSE_EXIT) | |
14566 | return TRAVERSE_EXIT; | |
14567 | return TRAVERSE_CONTINUE; | |
14568 | } | |
14569 | ||
d751bb78 | 14570 | // Dump ast representation for a type descriptor expression. |
14571 | ||
14572 | void | |
14573 | Type_descriptor_expression::do_dump_expression( | |
14574 | Ast_dump_context* ast_dump_context) const | |
14575 | { | |
14576 | ast_dump_context->dump_type(this->type_); | |
14577 | } | |
14578 | ||
e440a328 | 14579 | // Make a type descriptor expression. |
14580 | ||
14581 | Expression* | |
b13c66cd | 14582 | Expression::make_type_descriptor(Type* type, Location location) |
e440a328 | 14583 | { |
14584 | return new Type_descriptor_expression(type, location); | |
14585 | } | |
14586 | ||
aa5ae575 | 14587 | // An expression which evaluates to a pointer to the Garbage Collection symbol |
14588 | // of a type. | |
14589 | ||
14590 | class GC_symbol_expression : public Expression | |
14591 | { | |
14592 | public: | |
14593 | GC_symbol_expression(Type* type) | |
14594 | : Expression(EXPRESSION_GC_SYMBOL, Linemap::predeclared_location()), | |
14595 | type_(type) | |
14596 | {} | |
14597 | ||
14598 | protected: | |
14599 | Type* | |
14600 | do_type() | |
03118c21 | 14601 | { return Type::make_pointer_type(Type::lookup_integer_type("uint8")); } |
aa5ae575 | 14602 | |
14603 | bool | |
3ae06f68 | 14604 | do_is_static_initializer() const |
aa5ae575 | 14605 | { return true; } |
14606 | ||
14607 | void | |
14608 | do_determine_type(const Type_context*) | |
14609 | { } | |
14610 | ||
14611 | Expression* | |
14612 | do_copy() | |
14613 | { return this; } | |
14614 | ||
14615 | Bexpression* | |
14616 | do_get_backend(Translate_context* context) | |
14617 | { return this->type_->gc_symbol_pointer(context->gogo()); } | |
14618 | ||
14619 | void | |
14620 | do_dump_expression(Ast_dump_context*) const; | |
14621 | ||
14622 | private: | |
14623 | // The type which this gc symbol describes. | |
14624 | Type* type_; | |
14625 | }; | |
14626 | ||
14627 | // Dump ast representation for a gc symbol expression. | |
14628 | ||
14629 | void | |
14630 | GC_symbol_expression::do_dump_expression( | |
14631 | Ast_dump_context* ast_dump_context) const | |
14632 | { | |
14633 | ast_dump_context->ostream() << "gcdata("; | |
14634 | ast_dump_context->dump_type(this->type_); | |
14635 | ast_dump_context->ostream() << ")"; | |
14636 | } | |
14637 | ||
14638 | // Make a gc symbol expression. | |
14639 | ||
14640 | Expression* | |
14641 | Expression::make_gc_symbol(Type* type) | |
14642 | { | |
14643 | return new GC_symbol_expression(type); | |
14644 | } | |
14645 | ||
03118c21 | 14646 | // An expression that evaluates to a pointer to a symbol holding the |
14647 | // ptrmask data of a type. | |
14648 | ||
14649 | class Ptrmask_symbol_expression : public Expression | |
14650 | { | |
14651 | public: | |
14652 | Ptrmask_symbol_expression(Type* type) | |
14653 | : Expression(EXPRESSION_PTRMASK_SYMBOL, Linemap::predeclared_location()), | |
14654 | type_(type) | |
14655 | {} | |
14656 | ||
14657 | protected: | |
14658 | Type* | |
14659 | do_type() | |
14660 | { return Type::make_pointer_type(Type::lookup_integer_type("uint8")); } | |
14661 | ||
14662 | bool | |
14663 | do_is_static_initializer() const | |
14664 | { return true; } | |
14665 | ||
14666 | void | |
14667 | do_determine_type(const Type_context*) | |
14668 | { } | |
14669 | ||
14670 | Expression* | |
14671 | do_copy() | |
14672 | { return this; } | |
14673 | ||
14674 | Bexpression* | |
14675 | do_get_backend(Translate_context*); | |
14676 | ||
14677 | void | |
14678 | do_dump_expression(Ast_dump_context*) const; | |
14679 | ||
14680 | private: | |
14681 | // The type that this ptrmask symbol describes. | |
14682 | Type* type_; | |
14683 | }; | |
14684 | ||
14685 | // Return the ptrmask variable. | |
14686 | ||
14687 | Bexpression* | |
14688 | Ptrmask_symbol_expression::do_get_backend(Translate_context* context) | |
14689 | { | |
14690 | Gogo* gogo = context->gogo(); | |
14691 | ||
14692 | // If this type does not need a gcprog, then we can use the standard | |
14693 | // GC symbol. | |
14694 | int64_t ptrsize, ptrdata; | |
14695 | if (!this->type_->needs_gcprog(gogo, &ptrsize, &ptrdata)) | |
14696 | return this->type_->gc_symbol_pointer(gogo); | |
14697 | ||
14698 | // Otherwise we have to build a ptrmask variable, and return a | |
14699 | // pointer to it. | |
14700 | ||
14701 | Bvariable* bvar = this->type_->gc_ptrmask_var(gogo, ptrsize, ptrdata); | |
14702 | Location bloc = Linemap::predeclared_location(); | |
14703 | Bexpression* bref = gogo->backend()->var_expression(bvar, VE_rvalue, bloc); | |
14704 | Bexpression* baddr = gogo->backend()->address_expression(bref, bloc); | |
14705 | ||
14706 | Type* uint8_type = Type::lookup_integer_type("uint8"); | |
14707 | Type* pointer_uint8_type = Type::make_pointer_type(uint8_type); | |
14708 | Btype* ubtype = pointer_uint8_type->get_backend(gogo); | |
14709 | return gogo->backend()->convert_expression(ubtype, baddr, bloc); | |
14710 | } | |
14711 | ||
14712 | // Dump AST for a ptrmask symbol expression. | |
14713 | ||
14714 | void | |
14715 | Ptrmask_symbol_expression::do_dump_expression( | |
14716 | Ast_dump_context* ast_dump_context) const | |
14717 | { | |
14718 | ast_dump_context->ostream() << "ptrmask("; | |
14719 | ast_dump_context->dump_type(this->type_); | |
14720 | ast_dump_context->ostream() << ")"; | |
14721 | } | |
14722 | ||
14723 | // Make a ptrmask symbol expression. | |
14724 | ||
14725 | Expression* | |
14726 | Expression::make_ptrmask_symbol(Type* type) | |
14727 | { | |
14728 | return new Ptrmask_symbol_expression(type); | |
14729 | } | |
14730 | ||
e440a328 | 14731 | // An expression which evaluates to some characteristic of a type. |
14732 | // This is only used to initialize fields of a type descriptor. Using | |
14733 | // a new expression class is slightly inefficient but gives us a good | |
14734 | // separation between the frontend and the middle-end with regard to | |
14735 | // how types are laid out. | |
14736 | ||
14737 | class Type_info_expression : public Expression | |
14738 | { | |
14739 | public: | |
14740 | Type_info_expression(Type* type, Type_info type_info) | |
b13c66cd | 14741 | : Expression(EXPRESSION_TYPE_INFO, Linemap::predeclared_location()), |
e440a328 | 14742 | type_(type), type_info_(type_info) |
14743 | { } | |
14744 | ||
14745 | protected: | |
0e168074 | 14746 | bool |
3ae06f68 | 14747 | do_is_static_initializer() const |
0e168074 | 14748 | { return true; } |
14749 | ||
e440a328 | 14750 | Type* |
14751 | do_type(); | |
14752 | ||
14753 | void | |
14754 | do_determine_type(const Type_context*) | |
14755 | { } | |
14756 | ||
14757 | Expression* | |
14758 | do_copy() | |
14759 | { return this; } | |
14760 | ||
ea664253 | 14761 | Bexpression* |
14762 | do_get_backend(Translate_context* context); | |
e440a328 | 14763 | |
d751bb78 | 14764 | void |
14765 | do_dump_expression(Ast_dump_context*) const; | |
14766 | ||
e440a328 | 14767 | private: |
14768 | // The type for which we are getting information. | |
14769 | Type* type_; | |
14770 | // What information we want. | |
14771 | Type_info type_info_; | |
14772 | }; | |
14773 | ||
14774 | // The type is chosen to match what the type descriptor struct | |
14775 | // expects. | |
14776 | ||
14777 | Type* | |
14778 | Type_info_expression::do_type() | |
14779 | { | |
14780 | switch (this->type_info_) | |
14781 | { | |
14782 | case TYPE_INFO_SIZE: | |
03118c21 | 14783 | case TYPE_INFO_BACKEND_PTRDATA: |
14784 | case TYPE_INFO_DESCRIPTOR_PTRDATA: | |
e440a328 | 14785 | return Type::lookup_integer_type("uintptr"); |
14786 | case TYPE_INFO_ALIGNMENT: | |
14787 | case TYPE_INFO_FIELD_ALIGNMENT: | |
14788 | return Type::lookup_integer_type("uint8"); | |
14789 | default: | |
c3e6f413 | 14790 | go_unreachable(); |
e440a328 | 14791 | } |
14792 | } | |
14793 | ||
ea664253 | 14794 | // Return the backend representation for type information. |
e440a328 | 14795 | |
ea664253 | 14796 | Bexpression* |
14797 | Type_info_expression::do_get_backend(Translate_context* context) | |
e440a328 | 14798 | { |
927a01eb | 14799 | Gogo* gogo = context->gogo(); |
2a305b85 | 14800 | bool ok = true; |
3f378015 | 14801 | int64_t val; |
927a01eb | 14802 | switch (this->type_info_) |
e440a328 | 14803 | { |
927a01eb | 14804 | case TYPE_INFO_SIZE: |
2a305b85 | 14805 | ok = this->type_->backend_type_size(gogo, &val); |
927a01eb | 14806 | break; |
14807 | case TYPE_INFO_ALIGNMENT: | |
2a305b85 | 14808 | ok = this->type_->backend_type_align(gogo, &val); |
927a01eb | 14809 | break; |
14810 | case TYPE_INFO_FIELD_ALIGNMENT: | |
2a305b85 | 14811 | ok = this->type_->backend_type_field_align(gogo, &val); |
927a01eb | 14812 | break; |
03118c21 | 14813 | case TYPE_INFO_BACKEND_PTRDATA: |
14814 | ok = this->type_->backend_type_ptrdata(gogo, &val); | |
14815 | break; | |
14816 | case TYPE_INFO_DESCRIPTOR_PTRDATA: | |
14817 | ok = this->type_->descriptor_ptrdata(gogo, &val); | |
14818 | break; | |
927a01eb | 14819 | default: |
14820 | go_unreachable(); | |
e440a328 | 14821 | } |
2a305b85 | 14822 | if (!ok) |
14823 | { | |
14824 | go_assert(saw_errors()); | |
14825 | return gogo->backend()->error_expression(); | |
14826 | } | |
3f378015 | 14827 | Expression* e = Expression::make_integer_int64(val, this->type(), |
14828 | this->location()); | |
14829 | return e->get_backend(context); | |
e440a328 | 14830 | } |
14831 | ||
d751bb78 | 14832 | // Dump ast representation for a type info expression. |
14833 | ||
14834 | void | |
14835 | Type_info_expression::do_dump_expression( | |
14836 | Ast_dump_context* ast_dump_context) const | |
14837 | { | |
14838 | ast_dump_context->ostream() << "typeinfo("; | |
14839 | ast_dump_context->dump_type(this->type_); | |
14840 | ast_dump_context->ostream() << ","; | |
14841 | ast_dump_context->ostream() << | |
14842 | (this->type_info_ == TYPE_INFO_ALIGNMENT ? "alignment" | |
14843 | : this->type_info_ == TYPE_INFO_FIELD_ALIGNMENT ? "field alignment" | |
03118c21 | 14844 | : this->type_info_ == TYPE_INFO_SIZE ? "size" |
14845 | : this->type_info_ == TYPE_INFO_BACKEND_PTRDATA ? "backend_ptrdata" | |
14846 | : this->type_info_ == TYPE_INFO_DESCRIPTOR_PTRDATA ? "descriptor_ptrdata" | |
d751bb78 | 14847 | : "unknown"); |
14848 | ast_dump_context->ostream() << ")"; | |
14849 | } | |
14850 | ||
e440a328 | 14851 | // Make a type info expression. |
14852 | ||
14853 | Expression* | |
14854 | Expression::make_type_info(Type* type, Type_info type_info) | |
14855 | { | |
14856 | return new Type_info_expression(type, type_info); | |
14857 | } | |
14858 | ||
35a54f17 | 14859 | // An expression that evaluates to some characteristic of a slice. |
14860 | // This is used when indexing, bound-checking, or nil checking a slice. | |
14861 | ||
14862 | class Slice_info_expression : public Expression | |
14863 | { | |
14864 | public: | |
14865 | Slice_info_expression(Expression* slice, Slice_info slice_info, | |
14866 | Location location) | |
14867 | : Expression(EXPRESSION_SLICE_INFO, location), | |
14868 | slice_(slice), slice_info_(slice_info) | |
14869 | { } | |
14870 | ||
14871 | protected: | |
14872 | Type* | |
14873 | do_type(); | |
14874 | ||
14875 | void | |
14876 | do_determine_type(const Type_context*) | |
14877 | { } | |
14878 | ||
14879 | Expression* | |
14880 | do_copy() | |
14881 | { | |
14882 | return new Slice_info_expression(this->slice_->copy(), this->slice_info_, | |
14883 | this->location()); | |
14884 | } | |
14885 | ||
ea664253 | 14886 | Bexpression* |
14887 | do_get_backend(Translate_context* context); | |
35a54f17 | 14888 | |
14889 | void | |
14890 | do_dump_expression(Ast_dump_context*) const; | |
14891 | ||
14892 | void | |
14893 | do_issue_nil_check() | |
14894 | { this->slice_->issue_nil_check(); } | |
14895 | ||
14896 | private: | |
14897 | // The slice for which we are getting information. | |
14898 | Expression* slice_; | |
14899 | // What information we want. | |
14900 | Slice_info slice_info_; | |
14901 | }; | |
14902 | ||
14903 | // Return the type of the slice info. | |
14904 | ||
14905 | Type* | |
14906 | Slice_info_expression::do_type() | |
14907 | { | |
14908 | switch (this->slice_info_) | |
14909 | { | |
14910 | case SLICE_INFO_VALUE_POINTER: | |
14911 | return Type::make_pointer_type( | |
14912 | this->slice_->type()->array_type()->element_type()); | |
14913 | case SLICE_INFO_LENGTH: | |
14914 | case SLICE_INFO_CAPACITY: | |
14915 | return Type::lookup_integer_type("int"); | |
14916 | default: | |
14917 | go_unreachable(); | |
14918 | } | |
14919 | } | |
14920 | ||
ea664253 | 14921 | // Return the backend information for slice information. |
35a54f17 | 14922 | |
ea664253 | 14923 | Bexpression* |
14924 | Slice_info_expression::do_get_backend(Translate_context* context) | |
35a54f17 | 14925 | { |
14926 | Gogo* gogo = context->gogo(); | |
ea664253 | 14927 | Bexpression* bslice = this->slice_->get_backend(context); |
35a54f17 | 14928 | switch (this->slice_info_) |
14929 | { | |
14930 | case SLICE_INFO_VALUE_POINTER: | |
14931 | case SLICE_INFO_LENGTH: | |
14932 | case SLICE_INFO_CAPACITY: | |
ea664253 | 14933 | return gogo->backend()->struct_field_expression(bslice, this->slice_info_, |
14934 | this->location()); | |
35a54f17 | 14935 | break; |
14936 | default: | |
14937 | go_unreachable(); | |
14938 | } | |
35a54f17 | 14939 | } |
14940 | ||
14941 | // Dump ast representation for a type info expression. | |
14942 | ||
14943 | void | |
14944 | Slice_info_expression::do_dump_expression( | |
14945 | Ast_dump_context* ast_dump_context) const | |
14946 | { | |
14947 | ast_dump_context->ostream() << "sliceinfo("; | |
14948 | this->slice_->dump_expression(ast_dump_context); | |
14949 | ast_dump_context->ostream() << ","; | |
14950 | ast_dump_context->ostream() << | |
14951 | (this->slice_info_ == SLICE_INFO_VALUE_POINTER ? "values" | |
14952 | : this->slice_info_ == SLICE_INFO_LENGTH ? "length" | |
14953 | : this->slice_info_ == SLICE_INFO_CAPACITY ? "capacity " | |
14954 | : "unknown"); | |
14955 | ast_dump_context->ostream() << ")"; | |
14956 | } | |
14957 | ||
14958 | // Make a slice info expression. | |
14959 | ||
14960 | Expression* | |
14961 | Expression::make_slice_info(Expression* slice, Slice_info slice_info, | |
14962 | Location location) | |
14963 | { | |
14964 | return new Slice_info_expression(slice, slice_info, location); | |
14965 | } | |
14966 | ||
2c809f8f | 14967 | // An expression that represents a slice value: a struct with value pointer, |
14968 | // length, and capacity fields. | |
14969 | ||
14970 | class Slice_value_expression : public Expression | |
14971 | { | |
14972 | public: | |
14973 | Slice_value_expression(Type* type, Expression* valptr, Expression* len, | |
14974 | Expression* cap, Location location) | |
14975 | : Expression(EXPRESSION_SLICE_VALUE, location), | |
14976 | type_(type), valptr_(valptr), len_(len), cap_(cap) | |
14977 | { } | |
14978 | ||
14979 | protected: | |
14980 | int | |
14981 | do_traverse(Traverse*); | |
14982 | ||
14983 | Type* | |
14984 | do_type() | |
14985 | { return this->type_; } | |
14986 | ||
14987 | void | |
14988 | do_determine_type(const Type_context*) | |
14989 | { go_unreachable(); } | |
14990 | ||
14991 | Expression* | |
14992 | do_copy() | |
14993 | { | |
14994 | return new Slice_value_expression(this->type_, this->valptr_->copy(), | |
14995 | this->len_->copy(), this->cap_->copy(), | |
14996 | this->location()); | |
14997 | } | |
14998 | ||
ea664253 | 14999 | Bexpression* |
15000 | do_get_backend(Translate_context* context); | |
2c809f8f | 15001 | |
15002 | void | |
15003 | do_dump_expression(Ast_dump_context*) const; | |
15004 | ||
15005 | private: | |
15006 | // The type of the slice value. | |
15007 | Type* type_; | |
15008 | // The pointer to the values in the slice. | |
15009 | Expression* valptr_; | |
15010 | // The length of the slice. | |
15011 | Expression* len_; | |
15012 | // The capacity of the slice. | |
15013 | Expression* cap_; | |
15014 | }; | |
15015 | ||
15016 | int | |
15017 | Slice_value_expression::do_traverse(Traverse* traverse) | |
15018 | { | |
55e8ba6a | 15019 | if (Type::traverse(this->type_, traverse) == TRAVERSE_EXIT |
15020 | || Expression::traverse(&this->valptr_, traverse) == TRAVERSE_EXIT | |
2c809f8f | 15021 | || Expression::traverse(&this->len_, traverse) == TRAVERSE_EXIT |
15022 | || Expression::traverse(&this->cap_, traverse) == TRAVERSE_EXIT) | |
15023 | return TRAVERSE_EXIT; | |
15024 | return TRAVERSE_CONTINUE; | |
15025 | } | |
15026 | ||
ea664253 | 15027 | Bexpression* |
15028 | Slice_value_expression::do_get_backend(Translate_context* context) | |
2c809f8f | 15029 | { |
15030 | std::vector<Bexpression*> vals(3); | |
ea664253 | 15031 | vals[0] = this->valptr_->get_backend(context); |
15032 | vals[1] = this->len_->get_backend(context); | |
15033 | vals[2] = this->cap_->get_backend(context); | |
2c809f8f | 15034 | |
15035 | Gogo* gogo = context->gogo(); | |
15036 | Btype* btype = this->type_->get_backend(gogo); | |
ea664253 | 15037 | return gogo->backend()->constructor_expression(btype, vals, this->location()); |
2c809f8f | 15038 | } |
15039 | ||
15040 | void | |
15041 | Slice_value_expression::do_dump_expression( | |
15042 | Ast_dump_context* ast_dump_context) const | |
15043 | { | |
15044 | ast_dump_context->ostream() << "slicevalue("; | |
15045 | ast_dump_context->ostream() << "values: "; | |
15046 | this->valptr_->dump_expression(ast_dump_context); | |
15047 | ast_dump_context->ostream() << ", length: "; | |
15048 | this->len_->dump_expression(ast_dump_context); | |
15049 | ast_dump_context->ostream() << ", capacity: "; | |
15050 | this->cap_->dump_expression(ast_dump_context); | |
15051 | ast_dump_context->ostream() << ")"; | |
15052 | } | |
15053 | ||
15054 | Expression* | |
15055 | Expression::make_slice_value(Type* at, Expression* valptr, Expression* len, | |
15056 | Expression* cap, Location location) | |
15057 | { | |
15058 | go_assert(at->is_slice_type()); | |
15059 | return new Slice_value_expression(at, valptr, len, cap, location); | |
15060 | } | |
2387f644 | 15061 | |
15062 | // An expression that evaluates to some characteristic of a non-empty interface. | |
15063 | // This is used to access the method table or underlying object of an interface. | |
15064 | ||
15065 | class Interface_info_expression : public Expression | |
15066 | { | |
15067 | public: | |
15068 | Interface_info_expression(Expression* iface, Interface_info iface_info, | |
2c809f8f | 15069 | Location location) |
2387f644 | 15070 | : Expression(EXPRESSION_INTERFACE_INFO, location), |
15071 | iface_(iface), iface_info_(iface_info) | |
15072 | { } | |
15073 | ||
15074 | protected: | |
15075 | Type* | |
15076 | do_type(); | |
15077 | ||
15078 | void | |
15079 | do_determine_type(const Type_context*) | |
15080 | { } | |
15081 | ||
15082 | Expression* | |
15083 | do_copy() | |
15084 | { | |
15085 | return new Interface_info_expression(this->iface_->copy(), | |
15086 | this->iface_info_, this->location()); | |
15087 | } | |
15088 | ||
ea664253 | 15089 | Bexpression* |
15090 | do_get_backend(Translate_context* context); | |
2387f644 | 15091 | |
15092 | void | |
15093 | do_dump_expression(Ast_dump_context*) const; | |
15094 | ||
15095 | void | |
15096 | do_issue_nil_check() | |
15097 | { this->iface_->issue_nil_check(); } | |
15098 | ||
15099 | private: | |
15100 | // The interface for which we are getting information. | |
15101 | Expression* iface_; | |
15102 | // What information we want. | |
15103 | Interface_info iface_info_; | |
15104 | }; | |
15105 | ||
15106 | // Return the type of the interface info. | |
15107 | ||
15108 | Type* | |
15109 | Interface_info_expression::do_type() | |
15110 | { | |
15111 | switch (this->iface_info_) | |
15112 | { | |
15113 | case INTERFACE_INFO_METHODS: | |
15114 | { | |
625d3118 | 15115 | typedef Unordered_map(Interface_type*, Type*) Hashtable; |
15116 | static Hashtable result_types; | |
15117 | ||
15118 | Interface_type* itype = this->iface_->type()->interface_type(); | |
15119 | ||
15120 | Hashtable::const_iterator p = result_types.find(itype); | |
15121 | if (p != result_types.end()) | |
15122 | return p->second; | |
15123 | ||
2c809f8f | 15124 | Type* pdt = Type::make_type_descriptor_ptr_type(); |
625d3118 | 15125 | if (itype->is_empty()) |
15126 | { | |
15127 | result_types[itype] = pdt; | |
15128 | return pdt; | |
15129 | } | |
2c809f8f | 15130 | |
2387f644 | 15131 | Location loc = this->location(); |
15132 | Struct_field_list* sfl = new Struct_field_list(); | |
2387f644 | 15133 | sfl->push_back( |
15134 | Struct_field(Typed_identifier("__type_descriptor", pdt, loc))); | |
15135 | ||
2387f644 | 15136 | for (Typed_identifier_list::const_iterator p = itype->methods()->begin(); |
15137 | p != itype->methods()->end(); | |
15138 | ++p) | |
15139 | { | |
15140 | Function_type* ft = p->type()->function_type(); | |
15141 | go_assert(ft->receiver() == NULL); | |
15142 | ||
15143 | const Typed_identifier_list* params = ft->parameters(); | |
15144 | Typed_identifier_list* mparams = new Typed_identifier_list(); | |
15145 | if (params != NULL) | |
15146 | mparams->reserve(params->size() + 1); | |
15147 | Type* vt = Type::make_pointer_type(Type::make_void_type()); | |
15148 | mparams->push_back(Typed_identifier("", vt, ft->location())); | |
15149 | if (params != NULL) | |
15150 | { | |
15151 | for (Typed_identifier_list::const_iterator pp = params->begin(); | |
15152 | pp != params->end(); | |
15153 | ++pp) | |
15154 | mparams->push_back(*pp); | |
15155 | } | |
15156 | ||
15157 | Typed_identifier_list* mresults = (ft->results() == NULL | |
15158 | ? NULL | |
15159 | : ft->results()->copy()); | |
15160 | Backend_function_type* mft = | |
15161 | Type::make_backend_function_type(NULL, mparams, mresults, | |
15162 | ft->location()); | |
15163 | ||
15164 | std::string fname = Gogo::unpack_hidden_name(p->name()); | |
15165 | sfl->push_back(Struct_field(Typed_identifier(fname, mft, loc))); | |
15166 | } | |
15167 | ||
6bf4793c | 15168 | Struct_type* st = Type::make_struct_type(sfl, loc); |
15169 | st->set_is_struct_incomparable(); | |
15170 | Pointer_type *pt = Type::make_pointer_type(st); | |
625d3118 | 15171 | result_types[itype] = pt; |
15172 | return pt; | |
2387f644 | 15173 | } |
15174 | case INTERFACE_INFO_OBJECT: | |
15175 | return Type::make_pointer_type(Type::make_void_type()); | |
15176 | default: | |
15177 | go_unreachable(); | |
15178 | } | |
15179 | } | |
15180 | ||
ea664253 | 15181 | // Return the backend representation for interface information. |
2387f644 | 15182 | |
ea664253 | 15183 | Bexpression* |
15184 | Interface_info_expression::do_get_backend(Translate_context* context) | |
2387f644 | 15185 | { |
15186 | Gogo* gogo = context->gogo(); | |
ea664253 | 15187 | Bexpression* biface = this->iface_->get_backend(context); |
2387f644 | 15188 | switch (this->iface_info_) |
15189 | { | |
15190 | case INTERFACE_INFO_METHODS: | |
15191 | case INTERFACE_INFO_OBJECT: | |
ea664253 | 15192 | return gogo->backend()->struct_field_expression(biface, this->iface_info_, |
15193 | this->location()); | |
2387f644 | 15194 | break; |
15195 | default: | |
15196 | go_unreachable(); | |
15197 | } | |
2387f644 | 15198 | } |
15199 | ||
15200 | // Dump ast representation for an interface info expression. | |
15201 | ||
15202 | void | |
15203 | Interface_info_expression::do_dump_expression( | |
15204 | Ast_dump_context* ast_dump_context) const | |
15205 | { | |
2c809f8f | 15206 | bool is_empty = this->iface_->type()->interface_type()->is_empty(); |
2387f644 | 15207 | ast_dump_context->ostream() << "interfaceinfo("; |
15208 | this->iface_->dump_expression(ast_dump_context); | |
15209 | ast_dump_context->ostream() << ","; | |
15210 | ast_dump_context->ostream() << | |
2c809f8f | 15211 | (this->iface_info_ == INTERFACE_INFO_METHODS && !is_empty ? "methods" |
15212 | : this->iface_info_ == INTERFACE_INFO_TYPE_DESCRIPTOR ? "type_descriptor" | |
2387f644 | 15213 | : this->iface_info_ == INTERFACE_INFO_OBJECT ? "object" |
15214 | : "unknown"); | |
15215 | ast_dump_context->ostream() << ")"; | |
15216 | } | |
15217 | ||
15218 | // Make an interface info expression. | |
15219 | ||
15220 | Expression* | |
15221 | Expression::make_interface_info(Expression* iface, Interface_info iface_info, | |
15222 | Location location) | |
15223 | { | |
15224 | return new Interface_info_expression(iface, iface_info, location); | |
15225 | } | |
15226 | ||
2c809f8f | 15227 | // An expression that represents an interface value. The first field is either |
15228 | // a type descriptor for an empty interface or a pointer to the interface method | |
15229 | // table for a non-empty interface. The second field is always the object. | |
15230 | ||
15231 | class Interface_value_expression : public Expression | |
15232 | { | |
15233 | public: | |
15234 | Interface_value_expression(Type* type, Expression* first_field, | |
15235 | Expression* obj, Location location) | |
15236 | : Expression(EXPRESSION_INTERFACE_VALUE, location), | |
15237 | type_(type), first_field_(first_field), obj_(obj) | |
15238 | { } | |
15239 | ||
15240 | protected: | |
15241 | int | |
15242 | do_traverse(Traverse*); | |
15243 | ||
15244 | Type* | |
15245 | do_type() | |
15246 | { return this->type_; } | |
15247 | ||
15248 | void | |
15249 | do_determine_type(const Type_context*) | |
15250 | { go_unreachable(); } | |
15251 | ||
15252 | Expression* | |
15253 | do_copy() | |
15254 | { | |
15255 | return new Interface_value_expression(this->type_, | |
15256 | this->first_field_->copy(), | |
15257 | this->obj_->copy(), this->location()); | |
15258 | } | |
15259 | ||
ea664253 | 15260 | Bexpression* |
15261 | do_get_backend(Translate_context* context); | |
2c809f8f | 15262 | |
15263 | void | |
15264 | do_dump_expression(Ast_dump_context*) const; | |
15265 | ||
15266 | private: | |
15267 | // The type of the interface value. | |
15268 | Type* type_; | |
15269 | // The first field of the interface (either a type descriptor or a pointer | |
15270 | // to the method table. | |
15271 | Expression* first_field_; | |
15272 | // The underlying object of the interface. | |
15273 | Expression* obj_; | |
15274 | }; | |
15275 | ||
15276 | int | |
15277 | Interface_value_expression::do_traverse(Traverse* traverse) | |
15278 | { | |
15279 | if (Expression::traverse(&this->first_field_, traverse) == TRAVERSE_EXIT | |
15280 | || Expression::traverse(&this->obj_, traverse) == TRAVERSE_EXIT) | |
15281 | return TRAVERSE_EXIT; | |
15282 | return TRAVERSE_CONTINUE; | |
15283 | } | |
15284 | ||
ea664253 | 15285 | Bexpression* |
15286 | Interface_value_expression::do_get_backend(Translate_context* context) | |
2c809f8f | 15287 | { |
15288 | std::vector<Bexpression*> vals(2); | |
ea664253 | 15289 | vals[0] = this->first_field_->get_backend(context); |
15290 | vals[1] = this->obj_->get_backend(context); | |
2c809f8f | 15291 | |
15292 | Gogo* gogo = context->gogo(); | |
15293 | Btype* btype = this->type_->get_backend(gogo); | |
ea664253 | 15294 | return gogo->backend()->constructor_expression(btype, vals, this->location()); |
2c809f8f | 15295 | } |
15296 | ||
15297 | void | |
15298 | Interface_value_expression::do_dump_expression( | |
15299 | Ast_dump_context* ast_dump_context) const | |
15300 | { | |
15301 | ast_dump_context->ostream() << "interfacevalue("; | |
15302 | ast_dump_context->ostream() << | |
15303 | (this->type_->interface_type()->is_empty() | |
15304 | ? "type_descriptor: " | |
15305 | : "methods: "); | |
15306 | this->first_field_->dump_expression(ast_dump_context); | |
15307 | ast_dump_context->ostream() << ", object: "; | |
15308 | this->obj_->dump_expression(ast_dump_context); | |
15309 | ast_dump_context->ostream() << ")"; | |
15310 | } | |
15311 | ||
15312 | Expression* | |
15313 | Expression::make_interface_value(Type* type, Expression* first_value, | |
15314 | Expression* object, Location location) | |
15315 | { | |
15316 | return new Interface_value_expression(type, first_value, object, location); | |
15317 | } | |
15318 | ||
15319 | // An interface method table for a pair of types: an interface type and a type | |
15320 | // that implements that interface. | |
15321 | ||
15322 | class Interface_mtable_expression : public Expression | |
15323 | { | |
15324 | public: | |
15325 | Interface_mtable_expression(Interface_type* itype, Type* type, | |
15326 | bool is_pointer, Location location) | |
15327 | : Expression(EXPRESSION_INTERFACE_MTABLE, location), | |
15328 | itype_(itype), type_(type), is_pointer_(is_pointer), | |
15329 | method_table_type_(NULL), bvar_(NULL) | |
15330 | { } | |
15331 | ||
15332 | protected: | |
15333 | int | |
15334 | do_traverse(Traverse*); | |
15335 | ||
15336 | Type* | |
15337 | do_type(); | |
15338 | ||
15339 | bool | |
3ae06f68 | 15340 | do_is_static_initializer() const |
2c809f8f | 15341 | { return true; } |
15342 | ||
15343 | void | |
15344 | do_determine_type(const Type_context*) | |
15345 | { go_unreachable(); } | |
15346 | ||
15347 | Expression* | |
15348 | do_copy() | |
15349 | { | |
15350 | return new Interface_mtable_expression(this->itype_, this->type_, | |
15351 | this->is_pointer_, this->location()); | |
15352 | } | |
15353 | ||
15354 | bool | |
15355 | do_is_addressable() const | |
15356 | { return true; } | |
15357 | ||
ea664253 | 15358 | Bexpression* |
15359 | do_get_backend(Translate_context* context); | |
2c809f8f | 15360 | |
15361 | void | |
15362 | do_dump_expression(Ast_dump_context*) const; | |
15363 | ||
15364 | private: | |
15365 | // The interface type for which the methods are defined. | |
15366 | Interface_type* itype_; | |
15367 | // The type to construct the interface method table for. | |
15368 | Type* type_; | |
15369 | // Whether this table contains the method set for the receiver type or the | |
15370 | // pointer receiver type. | |
15371 | bool is_pointer_; | |
15372 | // The type of the method table. | |
15373 | Type* method_table_type_; | |
15374 | // The backend variable that refers to the interface method table. | |
15375 | Bvariable* bvar_; | |
15376 | }; | |
15377 | ||
15378 | int | |
15379 | Interface_mtable_expression::do_traverse(Traverse* traverse) | |
15380 | { | |
15381 | if (Type::traverse(this->itype_, traverse) == TRAVERSE_EXIT | |
15382 | || Type::traverse(this->type_, traverse) == TRAVERSE_EXIT) | |
15383 | return TRAVERSE_EXIT; | |
15384 | return TRAVERSE_CONTINUE; | |
15385 | } | |
15386 | ||
15387 | Type* | |
15388 | Interface_mtable_expression::do_type() | |
15389 | { | |
15390 | if (this->method_table_type_ != NULL) | |
15391 | return this->method_table_type_; | |
15392 | ||
15393 | const Typed_identifier_list* interface_methods = this->itype_->methods(); | |
15394 | go_assert(!interface_methods->empty()); | |
15395 | ||
15396 | Struct_field_list* sfl = new Struct_field_list; | |
15397 | Typed_identifier tid("__type_descriptor", Type::make_type_descriptor_ptr_type(), | |
15398 | this->location()); | |
15399 | sfl->push_back(Struct_field(tid)); | |
db122cb9 | 15400 | Type* unsafe_ptr_type = Type::make_pointer_type(Type::make_void_type()); |
2c809f8f | 15401 | for (Typed_identifier_list::const_iterator p = interface_methods->begin(); |
15402 | p != interface_methods->end(); | |
15403 | ++p) | |
db122cb9 | 15404 | { |
15405 | // We want C function pointers here, not func descriptors; model | |
15406 | // using void* pointers. | |
15407 | Typed_identifier method(p->name(), unsafe_ptr_type, p->location()); | |
15408 | sfl->push_back(Struct_field(method)); | |
15409 | } | |
6bf4793c | 15410 | Struct_type* st = Type::make_struct_type(sfl, this->location()); |
15411 | st->set_is_struct_incomparable(); | |
15412 | this->method_table_type_ = st; | |
2c809f8f | 15413 | return this->method_table_type_; |
15414 | } | |
15415 | ||
ea664253 | 15416 | Bexpression* |
15417 | Interface_mtable_expression::do_get_backend(Translate_context* context) | |
2c809f8f | 15418 | { |
15419 | Gogo* gogo = context->gogo(); | |
2c809f8f | 15420 | Location loc = Linemap::predeclared_location(); |
15421 | if (this->bvar_ != NULL) | |
d4e6573e | 15422 | return gogo->backend()->var_expression(this->bvar_, VE_rvalue, |
15423 | this->location()); | |
2c809f8f | 15424 | |
15425 | const Typed_identifier_list* interface_methods = this->itype_->methods(); | |
15426 | go_assert(!interface_methods->empty()); | |
15427 | ||
15428 | std::string mangled_name = ((this->is_pointer_ ? "__go_pimt__" : "__go_imt_") | |
15429 | + this->itype_->mangled_name(gogo) | |
15430 | + "__" | |
15431 | + this->type_->mangled_name(gogo)); | |
15432 | ||
15433 | // See whether this interface has any hidden methods. | |
15434 | bool has_hidden_methods = false; | |
15435 | for (Typed_identifier_list::const_iterator p = interface_methods->begin(); | |
15436 | p != interface_methods->end(); | |
15437 | ++p) | |
15438 | { | |
15439 | if (Gogo::is_hidden_name(p->name())) | |
15440 | { | |
15441 | has_hidden_methods = true; | |
15442 | break; | |
15443 | } | |
15444 | } | |
15445 | ||
15446 | // We already know that the named type is convertible to the | |
15447 | // interface. If the interface has hidden methods, and the named | |
15448 | // type is defined in a different package, then the interface | |
15449 | // conversion table will be defined by that other package. | |
15450 | if (has_hidden_methods | |
15451 | && this->type_->named_type() != NULL | |
15452 | && this->type_->named_type()->named_object()->package() != NULL) | |
15453 | { | |
15454 | Btype* btype = this->type()->get_backend(gogo); | |
438b4bec | 15455 | std::string asm_name(go_selectively_encode_id(mangled_name)); |
2c809f8f | 15456 | this->bvar_ = |
438b4bec | 15457 | gogo->backend()->immutable_struct_reference(mangled_name, asm_name, |
15458 | btype, loc); | |
d4e6573e | 15459 | return gogo->backend()->var_expression(this->bvar_, VE_rvalue, |
15460 | this->location()); | |
2c809f8f | 15461 | } |
15462 | ||
15463 | // The first element is the type descriptor. | |
15464 | Type* td_type; | |
15465 | if (!this->is_pointer_) | |
15466 | td_type = this->type_; | |
15467 | else | |
15468 | td_type = Type::make_pointer_type(this->type_); | |
15469 | ||
db122cb9 | 15470 | std::vector<Backend::Btyped_identifier> bstructfields; |
15471 | ||
2c809f8f | 15472 | // Build an interface method table for a type: a type descriptor followed by a |
15473 | // list of function pointers, one for each interface method. This is used for | |
15474 | // interfaces. | |
15475 | Expression_list* svals = new Expression_list(); | |
db122cb9 | 15476 | Expression* tdescriptor = Expression::make_type_descriptor(td_type, loc); |
15477 | svals->push_back(tdescriptor); | |
15478 | ||
15479 | Btype* tdesc_btype = tdescriptor->type()->get_backend(gogo); | |
15480 | Backend::Btyped_identifier btd("_type", tdesc_btype, loc); | |
15481 | bstructfields.push_back(btd); | |
2c809f8f | 15482 | |
15483 | Named_type* nt = this->type_->named_type(); | |
15484 | Struct_type* st = this->type_->struct_type(); | |
15485 | go_assert(nt != NULL || st != NULL); | |
15486 | ||
15487 | for (Typed_identifier_list::const_iterator p = interface_methods->begin(); | |
15488 | p != interface_methods->end(); | |
15489 | ++p) | |
15490 | { | |
15491 | bool is_ambiguous; | |
15492 | Method* m; | |
15493 | if (nt != NULL) | |
15494 | m = nt->method_function(p->name(), &is_ambiguous); | |
15495 | else | |
15496 | m = st->method_function(p->name(), &is_ambiguous); | |
15497 | go_assert(m != NULL); | |
15498 | Named_object* no = m->named_object(); | |
15499 | ||
15500 | go_assert(no->is_function() || no->is_function_declaration()); | |
db122cb9 | 15501 | |
15502 | Btype* fcn_btype = m->type()->get_backend_fntype(gogo); | |
15503 | Backend::Btyped_identifier bmtype(p->name(), fcn_btype, loc); | |
15504 | bstructfields.push_back(bmtype); | |
15505 | ||
2c809f8f | 15506 | svals->push_back(Expression::make_func_code_reference(no, loc)); |
15507 | } | |
15508 | ||
db122cb9 | 15509 | Btype *btype = gogo->backend()->struct_type(bstructfields); |
15510 | std::vector<Bexpression*> ctor_bexprs; | |
15511 | for (Expression_list::const_iterator pe = svals->begin(); | |
15512 | pe != svals->end(); | |
15513 | ++pe) | |
15514 | { | |
15515 | ctor_bexprs.push_back((*pe)->get_backend(context)); | |
15516 | } | |
15517 | Bexpression* ctor = | |
15518 | gogo->backend()->constructor_expression(btype, ctor_bexprs, loc); | |
2c809f8f | 15519 | |
15520 | bool is_public = has_hidden_methods && this->type_->named_type() != NULL; | |
438b4bec | 15521 | std::string asm_name(go_selectively_encode_id(mangled_name)); |
15522 | this->bvar_ = gogo->backend()->immutable_struct(mangled_name, asm_name, false, | |
2c809f8f | 15523 | !is_public, btype, loc); |
15524 | gogo->backend()->immutable_struct_set_init(this->bvar_, mangled_name, false, | |
15525 | !is_public, btype, loc, ctor); | |
d4e6573e | 15526 | return gogo->backend()->var_expression(this->bvar_, VE_lvalue, loc); |
2c809f8f | 15527 | } |
15528 | ||
15529 | void | |
15530 | Interface_mtable_expression::do_dump_expression( | |
15531 | Ast_dump_context* ast_dump_context) const | |
15532 | { | |
15533 | ast_dump_context->ostream() << "__go_" | |
15534 | << (this->is_pointer_ ? "pimt__" : "imt_"); | |
15535 | ast_dump_context->dump_type(this->itype_); | |
15536 | ast_dump_context->ostream() << "__"; | |
15537 | ast_dump_context->dump_type(this->type_); | |
15538 | } | |
15539 | ||
15540 | Expression* | |
15541 | Expression::make_interface_mtable_ref(Interface_type* itype, Type* type, | |
15542 | bool is_pointer, Location location) | |
15543 | { | |
15544 | return new Interface_mtable_expression(itype, type, is_pointer, location); | |
15545 | } | |
15546 | ||
e440a328 | 15547 | // An expression which evaluates to the offset of a field within a |
15548 | // struct. This, like Type_info_expression, q.v., is only used to | |
15549 | // initialize fields of a type descriptor. | |
15550 | ||
15551 | class Struct_field_offset_expression : public Expression | |
15552 | { | |
15553 | public: | |
15554 | Struct_field_offset_expression(Struct_type* type, const Struct_field* field) | |
b13c66cd | 15555 | : Expression(EXPRESSION_STRUCT_FIELD_OFFSET, |
15556 | Linemap::predeclared_location()), | |
e440a328 | 15557 | type_(type), field_(field) |
15558 | { } | |
15559 | ||
15560 | protected: | |
f23d7786 | 15561 | bool |
3ae06f68 | 15562 | do_is_static_initializer() const |
f23d7786 | 15563 | { return true; } |
15564 | ||
e440a328 | 15565 | Type* |
15566 | do_type() | |
15567 | { return Type::lookup_integer_type("uintptr"); } | |
15568 | ||
15569 | void | |
15570 | do_determine_type(const Type_context*) | |
15571 | { } | |
15572 | ||
15573 | Expression* | |
15574 | do_copy() | |
15575 | { return this; } | |
15576 | ||
ea664253 | 15577 | Bexpression* |
15578 | do_get_backend(Translate_context* context); | |
e440a328 | 15579 | |
d751bb78 | 15580 | void |
15581 | do_dump_expression(Ast_dump_context*) const; | |
15582 | ||
e440a328 | 15583 | private: |
15584 | // The type of the struct. | |
15585 | Struct_type* type_; | |
15586 | // The field. | |
15587 | const Struct_field* field_; | |
15588 | }; | |
15589 | ||
ea664253 | 15590 | // Return the backend representation for a struct field offset. |
e440a328 | 15591 | |
ea664253 | 15592 | Bexpression* |
15593 | Struct_field_offset_expression::do_get_backend(Translate_context* context) | |
e440a328 | 15594 | { |
e440a328 | 15595 | const Struct_field_list* fields = this->type_->fields(); |
e440a328 | 15596 | Struct_field_list::const_iterator p; |
2c8bda43 | 15597 | unsigned i = 0; |
e440a328 | 15598 | for (p = fields->begin(); |
15599 | p != fields->end(); | |
2c8bda43 | 15600 | ++p, ++i) |
15601 | if (&*p == this->field_) | |
15602 | break; | |
c484d925 | 15603 | go_assert(&*p == this->field_); |
e440a328 | 15604 | |
2c8bda43 | 15605 | Gogo* gogo = context->gogo(); |
15606 | Btype* btype = this->type_->get_backend(gogo); | |
15607 | ||
3f378015 | 15608 | int64_t offset = gogo->backend()->type_field_offset(btype, i); |
2c8bda43 | 15609 | Type* uptr_type = Type::lookup_integer_type("uintptr"); |
e67508fa | 15610 | Expression* ret = |
3f378015 | 15611 | Expression::make_integer_int64(offset, uptr_type, |
15612 | Linemap::predeclared_location()); | |
ea664253 | 15613 | return ret->get_backend(context); |
e440a328 | 15614 | } |
15615 | ||
d751bb78 | 15616 | // Dump ast representation for a struct field offset expression. |
15617 | ||
15618 | void | |
15619 | Struct_field_offset_expression::do_dump_expression( | |
15620 | Ast_dump_context* ast_dump_context) const | |
15621 | { | |
15622 | ast_dump_context->ostream() << "unsafe.Offsetof("; | |
2d29d278 | 15623 | ast_dump_context->dump_type(this->type_); |
15624 | ast_dump_context->ostream() << '.'; | |
15625 | ast_dump_context->ostream() << | |
15626 | Gogo::message_name(this->field_->field_name()); | |
d751bb78 | 15627 | ast_dump_context->ostream() << ")"; |
15628 | } | |
15629 | ||
e440a328 | 15630 | // Make an expression for a struct field offset. |
15631 | ||
15632 | Expression* | |
15633 | Expression::make_struct_field_offset(Struct_type* type, | |
15634 | const Struct_field* field) | |
15635 | { | |
15636 | return new Struct_field_offset_expression(type, field); | |
15637 | } | |
15638 | ||
15639 | // An expression which evaluates to the address of an unnamed label. | |
15640 | ||
15641 | class Label_addr_expression : public Expression | |
15642 | { | |
15643 | public: | |
b13c66cd | 15644 | Label_addr_expression(Label* label, Location location) |
e440a328 | 15645 | : Expression(EXPRESSION_LABEL_ADDR, location), |
15646 | label_(label) | |
15647 | { } | |
15648 | ||
15649 | protected: | |
15650 | Type* | |
15651 | do_type() | |
15652 | { return Type::make_pointer_type(Type::make_void_type()); } | |
15653 | ||
15654 | void | |
15655 | do_determine_type(const Type_context*) | |
15656 | { } | |
15657 | ||
15658 | Expression* | |
15659 | do_copy() | |
15660 | { return new Label_addr_expression(this->label_, this->location()); } | |
15661 | ||
ea664253 | 15662 | Bexpression* |
15663 | do_get_backend(Translate_context* context) | |
15664 | { return this->label_->get_addr(context, this->location()); } | |
e440a328 | 15665 | |
d751bb78 | 15666 | void |
15667 | do_dump_expression(Ast_dump_context* ast_dump_context) const | |
15668 | { ast_dump_context->ostream() << this->label_->name(); } | |
15669 | ||
e440a328 | 15670 | private: |
15671 | // The label whose address we are taking. | |
15672 | Label* label_; | |
15673 | }; | |
15674 | ||
15675 | // Make an expression for the address of an unnamed label. | |
15676 | ||
15677 | Expression* | |
b13c66cd | 15678 | Expression::make_label_addr(Label* label, Location location) |
e440a328 | 15679 | { |
15680 | return new Label_addr_expression(label, location); | |
15681 | } | |
15682 | ||
da244e59 | 15683 | // Class Conditional_expression. |
283a177b | 15684 | |
2c809f8f | 15685 | // Traversal. |
15686 | ||
15687 | int | |
15688 | Conditional_expression::do_traverse(Traverse* traverse) | |
15689 | { | |
15690 | if (Expression::traverse(&this->cond_, traverse) == TRAVERSE_EXIT | |
15691 | || Expression::traverse(&this->then_, traverse) == TRAVERSE_EXIT | |
15692 | || Expression::traverse(&this->else_, traverse) == TRAVERSE_EXIT) | |
15693 | return TRAVERSE_EXIT; | |
15694 | return TRAVERSE_CONTINUE; | |
15695 | } | |
15696 | ||
283a177b | 15697 | // Return the type of the conditional expression. |
15698 | ||
15699 | Type* | |
15700 | Conditional_expression::do_type() | |
15701 | { | |
15702 | Type* result_type = Type::make_void_type(); | |
2c809f8f | 15703 | if (Type::are_identical(this->then_->type(), this->else_->type(), false, |
15704 | NULL)) | |
283a177b | 15705 | result_type = this->then_->type(); |
15706 | else if (this->then_->is_nil_expression() | |
15707 | || this->else_->is_nil_expression()) | |
15708 | result_type = (!this->then_->is_nil_expression() | |
15709 | ? this->then_->type() | |
15710 | : this->else_->type()); | |
15711 | return result_type; | |
15712 | } | |
15713 | ||
2c809f8f | 15714 | // Determine type for a conditional expression. |
15715 | ||
15716 | void | |
15717 | Conditional_expression::do_determine_type(const Type_context* context) | |
15718 | { | |
15719 | this->cond_->determine_type_no_context(); | |
15720 | this->then_->determine_type(context); | |
15721 | this->else_->determine_type(context); | |
15722 | } | |
15723 | ||
283a177b | 15724 | // Get the backend representation of a conditional expression. |
15725 | ||
ea664253 | 15726 | Bexpression* |
15727 | Conditional_expression::do_get_backend(Translate_context* context) | |
283a177b | 15728 | { |
15729 | Gogo* gogo = context->gogo(); | |
15730 | Btype* result_btype = this->type()->get_backend(gogo); | |
ea664253 | 15731 | Bexpression* cond = this->cond_->get_backend(context); |
15732 | Bexpression* then = this->then_->get_backend(context); | |
15733 | Bexpression* belse = this->else_->get_backend(context); | |
93715b75 | 15734 | Bfunction* bfn = context->function()->func_value()->get_decl(); |
15735 | return gogo->backend()->conditional_expression(bfn, result_btype, cond, then, | |
ea664253 | 15736 | belse, this->location()); |
283a177b | 15737 | } |
15738 | ||
15739 | // Dump ast representation of a conditional expression. | |
15740 | ||
15741 | void | |
15742 | Conditional_expression::do_dump_expression( | |
15743 | Ast_dump_context* ast_dump_context) const | |
15744 | { | |
15745 | ast_dump_context->ostream() << "("; | |
15746 | ast_dump_context->dump_expression(this->cond_); | |
15747 | ast_dump_context->ostream() << " ? "; | |
15748 | ast_dump_context->dump_expression(this->then_); | |
15749 | ast_dump_context->ostream() << " : "; | |
15750 | ast_dump_context->dump_expression(this->else_); | |
15751 | ast_dump_context->ostream() << ") "; | |
15752 | } | |
15753 | ||
15754 | // Make a conditional expression. | |
15755 | ||
15756 | Expression* | |
15757 | Expression::make_conditional(Expression* cond, Expression* then, | |
15758 | Expression* else_expr, Location location) | |
15759 | { | |
15760 | return new Conditional_expression(cond, then, else_expr, location); | |
15761 | } | |
15762 | ||
da244e59 | 15763 | // Class Compound_expression. |
2c809f8f | 15764 | |
15765 | // Traversal. | |
15766 | ||
15767 | int | |
15768 | Compound_expression::do_traverse(Traverse* traverse) | |
15769 | { | |
15770 | if (Expression::traverse(&this->init_, traverse) == TRAVERSE_EXIT | |
15771 | || Expression::traverse(&this->expr_, traverse) == TRAVERSE_EXIT) | |
15772 | return TRAVERSE_EXIT; | |
15773 | return TRAVERSE_CONTINUE; | |
15774 | } | |
15775 | ||
15776 | // Return the type of the compound expression. | |
15777 | ||
15778 | Type* | |
15779 | Compound_expression::do_type() | |
15780 | { | |
15781 | return this->expr_->type(); | |
15782 | } | |
15783 | ||
15784 | // Determine type for a compound expression. | |
15785 | ||
15786 | void | |
15787 | Compound_expression::do_determine_type(const Type_context* context) | |
15788 | { | |
15789 | this->init_->determine_type_no_context(); | |
15790 | this->expr_->determine_type(context); | |
15791 | } | |
15792 | ||
15793 | // Get the backend representation of a compound expression. | |
15794 | ||
ea664253 | 15795 | Bexpression* |
15796 | Compound_expression::do_get_backend(Translate_context* context) | |
2c809f8f | 15797 | { |
15798 | Gogo* gogo = context->gogo(); | |
ea664253 | 15799 | Bexpression* binit = this->init_->get_backend(context); |
0ab48656 | 15800 | Bfunction* bfunction = context->function()->func_value()->get_decl(); |
15801 | Bstatement* init_stmt = gogo->backend()->expression_statement(bfunction, | |
15802 | binit); | |
ea664253 | 15803 | Bexpression* bexpr = this->expr_->get_backend(context); |
15804 | return gogo->backend()->compound_expression(init_stmt, bexpr, | |
15805 | this->location()); | |
2c809f8f | 15806 | } |
15807 | ||
15808 | // Dump ast representation of a conditional expression. | |
15809 | ||
15810 | void | |
15811 | Compound_expression::do_dump_expression( | |
15812 | Ast_dump_context* ast_dump_context) const | |
15813 | { | |
15814 | ast_dump_context->ostream() << "("; | |
15815 | ast_dump_context->dump_expression(this->init_); | |
15816 | ast_dump_context->ostream() << ","; | |
15817 | ast_dump_context->dump_expression(this->expr_); | |
15818 | ast_dump_context->ostream() << ") "; | |
15819 | } | |
15820 | ||
15821 | // Make a compound expression. | |
15822 | ||
15823 | Expression* | |
15824 | Expression::make_compound(Expression* init, Expression* expr, Location location) | |
15825 | { | |
15826 | return new Compound_expression(init, expr, location); | |
15827 | } | |
15828 | ||
1b4fb1e0 | 15829 | // Class Backend_expression. |
15830 | ||
15831 | int | |
15832 | Backend_expression::do_traverse(Traverse*) | |
15833 | { | |
15834 | return TRAVERSE_CONTINUE; | |
15835 | } | |
15836 | ||
15837 | void | |
15838 | Backend_expression::do_dump_expression(Ast_dump_context* ast_dump_context) const | |
15839 | { | |
15840 | ast_dump_context->ostream() << "backend_expression<"; | |
15841 | ast_dump_context->dump_type(this->type_); | |
15842 | ast_dump_context->ostream() << ">"; | |
15843 | } | |
15844 | ||
15845 | Expression* | |
15846 | Expression::make_backend(Bexpression* bexpr, Type* type, Location location) | |
15847 | { | |
15848 | return new Backend_expression(bexpr, type, location); | |
15849 | } | |
15850 | ||
e440a328 | 15851 | // Import an expression. This comes at the end in order to see the |
15852 | // various class definitions. | |
15853 | ||
15854 | Expression* | |
15855 | Expression::import_expression(Import* imp) | |
15856 | { | |
15857 | int c = imp->peek_char(); | |
15858 | if (imp->match_c_string("- ") | |
15859 | || imp->match_c_string("! ") | |
15860 | || imp->match_c_string("^ ")) | |
15861 | return Unary_expression::do_import(imp); | |
15862 | else if (c == '(') | |
15863 | return Binary_expression::do_import(imp); | |
15864 | else if (imp->match_c_string("true") | |
15865 | || imp->match_c_string("false")) | |
15866 | return Boolean_expression::do_import(imp); | |
15867 | else if (c == '"') | |
15868 | return String_expression::do_import(imp); | |
15869 | else if (c == '-' || (c >= '0' && c <= '9')) | |
15870 | { | |
15871 | // This handles integers, floats and complex constants. | |
15872 | return Integer_expression::do_import(imp); | |
15873 | } | |
15874 | else if (imp->match_c_string("nil")) | |
15875 | return Nil_expression::do_import(imp); | |
15876 | else if (imp->match_c_string("convert")) | |
15877 | return Type_conversion_expression::do_import(imp); | |
15878 | else | |
15879 | { | |
631d5788 | 15880 | go_error_at(imp->location(), "import error: expected expression"); |
e440a328 | 15881 | return Expression::make_error(imp->location()); |
15882 | } | |
15883 | } | |
15884 | ||
15885 | // Class Expression_list. | |
15886 | ||
15887 | // Traverse the list. | |
15888 | ||
15889 | int | |
15890 | Expression_list::traverse(Traverse* traverse) | |
15891 | { | |
15892 | for (Expression_list::iterator p = this->begin(); | |
15893 | p != this->end(); | |
15894 | ++p) | |
15895 | { | |
15896 | if (*p != NULL) | |
15897 | { | |
15898 | if (Expression::traverse(&*p, traverse) == TRAVERSE_EXIT) | |
15899 | return TRAVERSE_EXIT; | |
15900 | } | |
15901 | } | |
15902 | return TRAVERSE_CONTINUE; | |
15903 | } | |
15904 | ||
15905 | // Copy the list. | |
15906 | ||
15907 | Expression_list* | |
15908 | Expression_list::copy() | |
15909 | { | |
15910 | Expression_list* ret = new Expression_list(); | |
15911 | for (Expression_list::iterator p = this->begin(); | |
15912 | p != this->end(); | |
15913 | ++p) | |
15914 | { | |
15915 | if (*p == NULL) | |
15916 | ret->push_back(NULL); | |
15917 | else | |
15918 | ret->push_back((*p)->copy()); | |
15919 | } | |
15920 | return ret; | |
15921 | } | |
15922 | ||
15923 | // Return whether an expression list has an error expression. | |
15924 | ||
15925 | bool | |
15926 | Expression_list::contains_error() const | |
15927 | { | |
15928 | for (Expression_list::const_iterator p = this->begin(); | |
15929 | p != this->end(); | |
15930 | ++p) | |
15931 | if (*p != NULL && (*p)->is_error_expression()) | |
15932 | return true; | |
15933 | return false; | |
15934 | } | |
0c77715b | 15935 | |
15936 | // Class Numeric_constant. | |
15937 | ||
15938 | // Destructor. | |
15939 | ||
15940 | Numeric_constant::~Numeric_constant() | |
15941 | { | |
15942 | this->clear(); | |
15943 | } | |
15944 | ||
15945 | // Copy constructor. | |
15946 | ||
15947 | Numeric_constant::Numeric_constant(const Numeric_constant& a) | |
15948 | : classification_(a.classification_), type_(a.type_) | |
15949 | { | |
15950 | switch (a.classification_) | |
15951 | { | |
15952 | case NC_INVALID: | |
15953 | break; | |
15954 | case NC_INT: | |
15955 | case NC_RUNE: | |
15956 | mpz_init_set(this->u_.int_val, a.u_.int_val); | |
15957 | break; | |
15958 | case NC_FLOAT: | |
15959 | mpfr_init_set(this->u_.float_val, a.u_.float_val, GMP_RNDN); | |
15960 | break; | |
15961 | case NC_COMPLEX: | |
fcbea5e4 | 15962 | mpc_init2(this->u_.complex_val, mpc_precision); |
15963 | mpc_set(this->u_.complex_val, a.u_.complex_val, MPC_RNDNN); | |
0c77715b | 15964 | break; |
15965 | default: | |
15966 | go_unreachable(); | |
15967 | } | |
15968 | } | |
15969 | ||
15970 | // Assignment operator. | |
15971 | ||
15972 | Numeric_constant& | |
15973 | Numeric_constant::operator=(const Numeric_constant& a) | |
15974 | { | |
15975 | this->clear(); | |
15976 | this->classification_ = a.classification_; | |
15977 | this->type_ = a.type_; | |
15978 | switch (a.classification_) | |
15979 | { | |
15980 | case NC_INVALID: | |
15981 | break; | |
15982 | case NC_INT: | |
15983 | case NC_RUNE: | |
15984 | mpz_init_set(this->u_.int_val, a.u_.int_val); | |
15985 | break; | |
15986 | case NC_FLOAT: | |
15987 | mpfr_init_set(this->u_.float_val, a.u_.float_val, GMP_RNDN); | |
15988 | break; | |
15989 | case NC_COMPLEX: | |
fcbea5e4 | 15990 | mpc_init2(this->u_.complex_val, mpc_precision); |
15991 | mpc_set(this->u_.complex_val, a.u_.complex_val, MPC_RNDNN); | |
0c77715b | 15992 | break; |
15993 | default: | |
15994 | go_unreachable(); | |
15995 | } | |
15996 | return *this; | |
15997 | } | |
15998 | ||
15999 | // Clear the contents. | |
16000 | ||
16001 | void | |
16002 | Numeric_constant::clear() | |
16003 | { | |
16004 | switch (this->classification_) | |
16005 | { | |
16006 | case NC_INVALID: | |
16007 | break; | |
16008 | case NC_INT: | |
16009 | case NC_RUNE: | |
16010 | mpz_clear(this->u_.int_val); | |
16011 | break; | |
16012 | case NC_FLOAT: | |
16013 | mpfr_clear(this->u_.float_val); | |
16014 | break; | |
16015 | case NC_COMPLEX: | |
fcbea5e4 | 16016 | mpc_clear(this->u_.complex_val); |
0c77715b | 16017 | break; |
16018 | default: | |
16019 | go_unreachable(); | |
16020 | } | |
16021 | this->classification_ = NC_INVALID; | |
16022 | } | |
16023 | ||
16024 | // Set to an unsigned long value. | |
16025 | ||
16026 | void | |
16027 | Numeric_constant::set_unsigned_long(Type* type, unsigned long val) | |
16028 | { | |
16029 | this->clear(); | |
16030 | this->classification_ = NC_INT; | |
16031 | this->type_ = type; | |
16032 | mpz_init_set_ui(this->u_.int_val, val); | |
16033 | } | |
16034 | ||
16035 | // Set to an integer value. | |
16036 | ||
16037 | void | |
16038 | Numeric_constant::set_int(Type* type, const mpz_t val) | |
16039 | { | |
16040 | this->clear(); | |
16041 | this->classification_ = NC_INT; | |
16042 | this->type_ = type; | |
16043 | mpz_init_set(this->u_.int_val, val); | |
16044 | } | |
16045 | ||
16046 | // Set to a rune value. | |
16047 | ||
16048 | void | |
16049 | Numeric_constant::set_rune(Type* type, const mpz_t val) | |
16050 | { | |
16051 | this->clear(); | |
16052 | this->classification_ = NC_RUNE; | |
16053 | this->type_ = type; | |
16054 | mpz_init_set(this->u_.int_val, val); | |
16055 | } | |
16056 | ||
16057 | // Set to a floating point value. | |
16058 | ||
16059 | void | |
16060 | Numeric_constant::set_float(Type* type, const mpfr_t val) | |
16061 | { | |
16062 | this->clear(); | |
16063 | this->classification_ = NC_FLOAT; | |
16064 | this->type_ = type; | |
833b523c | 16065 | // Numeric constants do not have negative zero values, so remove |
16066 | // them here. They also don't have infinity or NaN values, but we | |
16067 | // should never see them here. | |
16068 | if (mpfr_zero_p(val)) | |
16069 | mpfr_init_set_ui(this->u_.float_val, 0, GMP_RNDN); | |
16070 | else | |
16071 | mpfr_init_set(this->u_.float_val, val, GMP_RNDN); | |
0c77715b | 16072 | } |
16073 | ||
16074 | // Set to a complex value. | |
16075 | ||
16076 | void | |
fcbea5e4 | 16077 | Numeric_constant::set_complex(Type* type, const mpc_t val) |
0c77715b | 16078 | { |
16079 | this->clear(); | |
16080 | this->classification_ = NC_COMPLEX; | |
16081 | this->type_ = type; | |
fcbea5e4 | 16082 | mpc_init2(this->u_.complex_val, mpc_precision); |
16083 | mpc_set(this->u_.complex_val, val, MPC_RNDNN); | |
0c77715b | 16084 | } |
16085 | ||
16086 | // Get an int value. | |
16087 | ||
16088 | void | |
16089 | Numeric_constant::get_int(mpz_t* val) const | |
16090 | { | |
16091 | go_assert(this->is_int()); | |
16092 | mpz_init_set(*val, this->u_.int_val); | |
16093 | } | |
16094 | ||
16095 | // Get a rune value. | |
16096 | ||
16097 | void | |
16098 | Numeric_constant::get_rune(mpz_t* val) const | |
16099 | { | |
16100 | go_assert(this->is_rune()); | |
16101 | mpz_init_set(*val, this->u_.int_val); | |
16102 | } | |
16103 | ||
16104 | // Get a floating point value. | |
16105 | ||
16106 | void | |
16107 | Numeric_constant::get_float(mpfr_t* val) const | |
16108 | { | |
16109 | go_assert(this->is_float()); | |
16110 | mpfr_init_set(*val, this->u_.float_val, GMP_RNDN); | |
16111 | } | |
16112 | ||
16113 | // Get a complex value. | |
16114 | ||
16115 | void | |
fcbea5e4 | 16116 | Numeric_constant::get_complex(mpc_t* val) const |
0c77715b | 16117 | { |
16118 | go_assert(this->is_complex()); | |
fcbea5e4 | 16119 | mpc_init2(*val, mpc_precision); |
16120 | mpc_set(*val, this->u_.complex_val, MPC_RNDNN); | |
0c77715b | 16121 | } |
16122 | ||
16123 | // Express value as unsigned long if possible. | |
16124 | ||
16125 | Numeric_constant::To_unsigned_long | |
16126 | Numeric_constant::to_unsigned_long(unsigned long* val) const | |
16127 | { | |
16128 | switch (this->classification_) | |
16129 | { | |
16130 | case NC_INT: | |
16131 | case NC_RUNE: | |
16132 | return this->mpz_to_unsigned_long(this->u_.int_val, val); | |
16133 | case NC_FLOAT: | |
16134 | return this->mpfr_to_unsigned_long(this->u_.float_val, val); | |
16135 | case NC_COMPLEX: | |
fcbea5e4 | 16136 | if (!mpfr_zero_p(mpc_imagref(this->u_.complex_val))) |
0c77715b | 16137 | return NC_UL_NOTINT; |
fcbea5e4 | 16138 | return this->mpfr_to_unsigned_long(mpc_realref(this->u_.complex_val), |
16139 | val); | |
0c77715b | 16140 | default: |
16141 | go_unreachable(); | |
16142 | } | |
16143 | } | |
16144 | ||
16145 | // Express integer value as unsigned long if possible. | |
16146 | ||
16147 | Numeric_constant::To_unsigned_long | |
16148 | Numeric_constant::mpz_to_unsigned_long(const mpz_t ival, | |
16149 | unsigned long *val) const | |
16150 | { | |
16151 | if (mpz_sgn(ival) < 0) | |
16152 | return NC_UL_NEGATIVE; | |
16153 | unsigned long ui = mpz_get_ui(ival); | |
16154 | if (mpz_cmp_ui(ival, ui) != 0) | |
16155 | return NC_UL_BIG; | |
16156 | *val = ui; | |
16157 | return NC_UL_VALID; | |
16158 | } | |
16159 | ||
16160 | // Express floating point value as unsigned long if possible. | |
16161 | ||
16162 | Numeric_constant::To_unsigned_long | |
16163 | Numeric_constant::mpfr_to_unsigned_long(const mpfr_t fval, | |
16164 | unsigned long *val) const | |
16165 | { | |
16166 | if (!mpfr_integer_p(fval)) | |
16167 | return NC_UL_NOTINT; | |
16168 | mpz_t ival; | |
16169 | mpz_init(ival); | |
16170 | mpfr_get_z(ival, fval, GMP_RNDN); | |
16171 | To_unsigned_long ret = this->mpz_to_unsigned_long(ival, val); | |
16172 | mpz_clear(ival); | |
16173 | return ret; | |
16174 | } | |
16175 | ||
03118c21 | 16176 | // Express value as memory size if possible. |
16177 | ||
16178 | bool | |
16179 | Numeric_constant::to_memory_size(int64_t* val) const | |
16180 | { | |
16181 | switch (this->classification_) | |
16182 | { | |
16183 | case NC_INT: | |
16184 | case NC_RUNE: | |
16185 | return this->mpz_to_memory_size(this->u_.int_val, val); | |
16186 | case NC_FLOAT: | |
16187 | return this->mpfr_to_memory_size(this->u_.float_val, val); | |
16188 | case NC_COMPLEX: | |
16189 | if (!mpfr_zero_p(mpc_imagref(this->u_.complex_val))) | |
16190 | return false; | |
16191 | return this->mpfr_to_memory_size(mpc_realref(this->u_.complex_val), val); | |
16192 | default: | |
16193 | go_unreachable(); | |
16194 | } | |
16195 | } | |
16196 | ||
16197 | // Express integer as memory size if possible. | |
16198 | ||
16199 | bool | |
16200 | Numeric_constant::mpz_to_memory_size(const mpz_t ival, int64_t* val) const | |
16201 | { | |
16202 | if (mpz_sgn(ival) < 0) | |
16203 | return false; | |
16204 | if (mpz_fits_slong_p(ival)) | |
16205 | { | |
16206 | *val = static_cast<int64_t>(mpz_get_si(ival)); | |
16207 | return true; | |
16208 | } | |
16209 | ||
16210 | // Test >= 64, not > 64, because an int64_t can hold 63 bits of a | |
16211 | // positive value. | |
16212 | if (mpz_sizeinbase(ival, 2) >= 64) | |
16213 | return false; | |
16214 | ||
16215 | mpz_t q, r; | |
16216 | mpz_init(q); | |
16217 | mpz_init(r); | |
16218 | mpz_tdiv_q_2exp(q, ival, 32); | |
16219 | mpz_tdiv_r_2exp(r, ival, 32); | |
16220 | go_assert(mpz_fits_ulong_p(q) && mpz_fits_ulong_p(r)); | |
16221 | *val = ((static_cast<int64_t>(mpz_get_ui(q)) << 32) | |
16222 | + static_cast<int64_t>(mpz_get_ui(r))); | |
16223 | mpz_clear(r); | |
16224 | mpz_clear(q); | |
16225 | return true; | |
16226 | } | |
16227 | ||
16228 | // Express floating point value as memory size if possible. | |
16229 | ||
16230 | bool | |
16231 | Numeric_constant::mpfr_to_memory_size(const mpfr_t fval, int64_t* val) const | |
16232 | { | |
16233 | if (!mpfr_integer_p(fval)) | |
16234 | return false; | |
16235 | mpz_t ival; | |
16236 | mpz_init(ival); | |
16237 | mpfr_get_z(ival, fval, GMP_RNDN); | |
16238 | bool ret = this->mpz_to_memory_size(ival, val); | |
16239 | mpz_clear(ival); | |
16240 | return ret; | |
16241 | } | |
16242 | ||
0c77715b | 16243 | // Convert value to integer if possible. |
16244 | ||
16245 | bool | |
16246 | Numeric_constant::to_int(mpz_t* val) const | |
16247 | { | |
16248 | switch (this->classification_) | |
16249 | { | |
16250 | case NC_INT: | |
16251 | case NC_RUNE: | |
16252 | mpz_init_set(*val, this->u_.int_val); | |
16253 | return true; | |
16254 | case NC_FLOAT: | |
16255 | if (!mpfr_integer_p(this->u_.float_val)) | |
16256 | return false; | |
16257 | mpz_init(*val); | |
16258 | mpfr_get_z(*val, this->u_.float_val, GMP_RNDN); | |
16259 | return true; | |
16260 | case NC_COMPLEX: | |
fcbea5e4 | 16261 | if (!mpfr_zero_p(mpc_imagref(this->u_.complex_val)) |
16262 | || !mpfr_integer_p(mpc_realref(this->u_.complex_val))) | |
0c77715b | 16263 | return false; |
16264 | mpz_init(*val); | |
fcbea5e4 | 16265 | mpfr_get_z(*val, mpc_realref(this->u_.complex_val), GMP_RNDN); |
0c77715b | 16266 | return true; |
16267 | default: | |
16268 | go_unreachable(); | |
16269 | } | |
16270 | } | |
16271 | ||
16272 | // Convert value to floating point if possible. | |
16273 | ||
16274 | bool | |
16275 | Numeric_constant::to_float(mpfr_t* val) const | |
16276 | { | |
16277 | switch (this->classification_) | |
16278 | { | |
16279 | case NC_INT: | |
16280 | case NC_RUNE: | |
16281 | mpfr_init_set_z(*val, this->u_.int_val, GMP_RNDN); | |
16282 | return true; | |
16283 | case NC_FLOAT: | |
16284 | mpfr_init_set(*val, this->u_.float_val, GMP_RNDN); | |
16285 | return true; | |
16286 | case NC_COMPLEX: | |
fcbea5e4 | 16287 | if (!mpfr_zero_p(mpc_imagref(this->u_.complex_val))) |
0c77715b | 16288 | return false; |
fcbea5e4 | 16289 | mpfr_init_set(*val, mpc_realref(this->u_.complex_val), GMP_RNDN); |
0c77715b | 16290 | return true; |
16291 | default: | |
16292 | go_unreachable(); | |
16293 | } | |
16294 | } | |
16295 | ||
16296 | // Convert value to complex. | |
16297 | ||
16298 | bool | |
fcbea5e4 | 16299 | Numeric_constant::to_complex(mpc_t* val) const |
0c77715b | 16300 | { |
fcbea5e4 | 16301 | mpc_init2(*val, mpc_precision); |
0c77715b | 16302 | switch (this->classification_) |
16303 | { | |
16304 | case NC_INT: | |
16305 | case NC_RUNE: | |
fcbea5e4 | 16306 | mpc_set_z(*val, this->u_.int_val, MPC_RNDNN); |
0c77715b | 16307 | return true; |
16308 | case NC_FLOAT: | |
fcbea5e4 | 16309 | mpc_set_fr(*val, this->u_.float_val, MPC_RNDNN); |
0c77715b | 16310 | return true; |
16311 | case NC_COMPLEX: | |
fcbea5e4 | 16312 | mpc_set(*val, this->u_.complex_val, MPC_RNDNN); |
0c77715b | 16313 | return true; |
16314 | default: | |
16315 | go_unreachable(); | |
16316 | } | |
16317 | } | |
16318 | ||
16319 | // Get the type. | |
16320 | ||
16321 | Type* | |
16322 | Numeric_constant::type() const | |
16323 | { | |
16324 | if (this->type_ != NULL) | |
16325 | return this->type_; | |
16326 | switch (this->classification_) | |
16327 | { | |
16328 | case NC_INT: | |
16329 | return Type::make_abstract_integer_type(); | |
16330 | case NC_RUNE: | |
16331 | return Type::make_abstract_character_type(); | |
16332 | case NC_FLOAT: | |
16333 | return Type::make_abstract_float_type(); | |
16334 | case NC_COMPLEX: | |
16335 | return Type::make_abstract_complex_type(); | |
16336 | default: | |
16337 | go_unreachable(); | |
16338 | } | |
16339 | } | |
16340 | ||
16341 | // If the constant can be expressed in TYPE, then set the type of the | |
16342 | // constant to TYPE and return true. Otherwise return false, and, if | |
16343 | // ISSUE_ERROR is true, report an appropriate error message. | |
16344 | ||
16345 | bool | |
16346 | Numeric_constant::set_type(Type* type, bool issue_error, Location loc) | |
16347 | { | |
16348 | bool ret; | |
f11c2155 | 16349 | if (type == NULL || type->is_error()) |
0c77715b | 16350 | ret = true; |
16351 | else if (type->integer_type() != NULL) | |
16352 | ret = this->check_int_type(type->integer_type(), issue_error, loc); | |
16353 | else if (type->float_type() != NULL) | |
16354 | ret = this->check_float_type(type->float_type(), issue_error, loc); | |
16355 | else if (type->complex_type() != NULL) | |
16356 | ret = this->check_complex_type(type->complex_type(), issue_error, loc); | |
16357 | else | |
5706ab68 | 16358 | { |
16359 | ret = false; | |
16360 | if (issue_error) | |
16361 | go_assert(saw_errors()); | |
16362 | } | |
0c77715b | 16363 | if (ret) |
16364 | this->type_ = type; | |
16365 | return ret; | |
16366 | } | |
16367 | ||
16368 | // Check whether the constant can be expressed in an integer type. | |
16369 | ||
16370 | bool | |
16371 | Numeric_constant::check_int_type(Integer_type* type, bool issue_error, | |
71a45216 | 16372 | Location location) |
0c77715b | 16373 | { |
16374 | mpz_t val; | |
16375 | switch (this->classification_) | |
16376 | { | |
16377 | case NC_INT: | |
16378 | case NC_RUNE: | |
16379 | mpz_init_set(val, this->u_.int_val); | |
16380 | break; | |
16381 | ||
16382 | case NC_FLOAT: | |
16383 | if (!mpfr_integer_p(this->u_.float_val)) | |
16384 | { | |
16385 | if (issue_error) | |
71a45216 | 16386 | { |
631d5788 | 16387 | go_error_at(location, |
16388 | "floating point constant truncated to integer"); | |
71a45216 | 16389 | this->set_invalid(); |
16390 | } | |
0c77715b | 16391 | return false; |
16392 | } | |
16393 | mpz_init(val); | |
16394 | mpfr_get_z(val, this->u_.float_val, GMP_RNDN); | |
16395 | break; | |
16396 | ||
16397 | case NC_COMPLEX: | |
fcbea5e4 | 16398 | if (!mpfr_integer_p(mpc_realref(this->u_.complex_val)) |
16399 | || !mpfr_zero_p(mpc_imagref(this->u_.complex_val))) | |
0c77715b | 16400 | { |
16401 | if (issue_error) | |
71a45216 | 16402 | { |
631d5788 | 16403 | go_error_at(location, "complex constant truncated to integer"); |
71a45216 | 16404 | this->set_invalid(); |
16405 | } | |
0c77715b | 16406 | return false; |
16407 | } | |
16408 | mpz_init(val); | |
fcbea5e4 | 16409 | mpfr_get_z(val, mpc_realref(this->u_.complex_val), GMP_RNDN); |
0c77715b | 16410 | break; |
16411 | ||
16412 | default: | |
16413 | go_unreachable(); | |
16414 | } | |
16415 | ||
16416 | bool ret; | |
16417 | if (type->is_abstract()) | |
16418 | ret = true; | |
16419 | else | |
16420 | { | |
16421 | int bits = mpz_sizeinbase(val, 2); | |
16422 | if (type->is_unsigned()) | |
16423 | { | |
16424 | // For an unsigned type we can only accept a nonnegative | |
16425 | // number, and we must be able to represents at least BITS. | |
16426 | ret = mpz_sgn(val) >= 0 && bits <= type->bits(); | |
16427 | } | |
16428 | else | |
16429 | { | |
16430 | // For a signed type we need an extra bit to indicate the | |
16431 | // sign. We have to handle the most negative integer | |
16432 | // specially. | |
16433 | ret = (bits + 1 <= type->bits() | |
16434 | || (bits <= type->bits() | |
16435 | && mpz_sgn(val) < 0 | |
16436 | && (mpz_scan1(val, 0) | |
16437 | == static_cast<unsigned long>(type->bits() - 1)) | |
16438 | && mpz_scan0(val, type->bits()) == ULONG_MAX)); | |
16439 | } | |
16440 | } | |
16441 | ||
16442 | if (!ret && issue_error) | |
71a45216 | 16443 | { |
631d5788 | 16444 | go_error_at(location, "integer constant overflow"); |
71a45216 | 16445 | this->set_invalid(); |
16446 | } | |
0c77715b | 16447 | |
16448 | return ret; | |
16449 | } | |
16450 | ||
16451 | // Check whether the constant can be expressed in a floating point | |
16452 | // type. | |
16453 | ||
16454 | bool | |
16455 | Numeric_constant::check_float_type(Float_type* type, bool issue_error, | |
d0bcce51 | 16456 | Location location) |
0c77715b | 16457 | { |
16458 | mpfr_t val; | |
16459 | switch (this->classification_) | |
16460 | { | |
16461 | case NC_INT: | |
16462 | case NC_RUNE: | |
16463 | mpfr_init_set_z(val, this->u_.int_val, GMP_RNDN); | |
16464 | break; | |
16465 | ||
16466 | case NC_FLOAT: | |
16467 | mpfr_init_set(val, this->u_.float_val, GMP_RNDN); | |
16468 | break; | |
16469 | ||
16470 | case NC_COMPLEX: | |
fcbea5e4 | 16471 | if (!mpfr_zero_p(mpc_imagref(this->u_.complex_val))) |
0c77715b | 16472 | { |
16473 | if (issue_error) | |
71a45216 | 16474 | { |
16475 | this->set_invalid(); | |
631d5788 | 16476 | go_error_at(location, "complex constant truncated to float"); |
71a45216 | 16477 | } |
0c77715b | 16478 | return false; |
16479 | } | |
fcbea5e4 | 16480 | mpfr_init_set(val, mpc_realref(this->u_.complex_val), GMP_RNDN); |
0c77715b | 16481 | break; |
16482 | ||
16483 | default: | |
16484 | go_unreachable(); | |
16485 | } | |
16486 | ||
16487 | bool ret; | |
16488 | if (type->is_abstract()) | |
16489 | ret = true; | |
16490 | else if (mpfr_nan_p(val) || mpfr_inf_p(val) || mpfr_zero_p(val)) | |
16491 | { | |
16492 | // A NaN or Infinity always fits in the range of the type. | |
16493 | ret = true; | |
16494 | } | |
16495 | else | |
16496 | { | |
16497 | mp_exp_t exp = mpfr_get_exp(val); | |
16498 | mp_exp_t max_exp; | |
16499 | switch (type->bits()) | |
16500 | { | |
16501 | case 32: | |
16502 | max_exp = 128; | |
16503 | break; | |
16504 | case 64: | |
16505 | max_exp = 1024; | |
16506 | break; | |
16507 | default: | |
16508 | go_unreachable(); | |
16509 | } | |
16510 | ||
16511 | ret = exp <= max_exp; | |
d0bcce51 | 16512 | |
16513 | if (ret) | |
16514 | { | |
16515 | // Round the constant to the desired type. | |
16516 | mpfr_t t; | |
16517 | mpfr_init(t); | |
16518 | switch (type->bits()) | |
16519 | { | |
16520 | case 32: | |
16521 | mpfr_set_prec(t, 24); | |
16522 | break; | |
16523 | case 64: | |
16524 | mpfr_set_prec(t, 53); | |
16525 | break; | |
16526 | default: | |
16527 | go_unreachable(); | |
16528 | } | |
16529 | mpfr_set(t, val, GMP_RNDN); | |
16530 | mpfr_set(val, t, GMP_RNDN); | |
16531 | mpfr_clear(t); | |
16532 | ||
16533 | this->set_float(type, val); | |
16534 | } | |
0c77715b | 16535 | } |
16536 | ||
16537 | mpfr_clear(val); | |
16538 | ||
16539 | if (!ret && issue_error) | |
71a45216 | 16540 | { |
631d5788 | 16541 | go_error_at(location, "floating point constant overflow"); |
71a45216 | 16542 | this->set_invalid(); |
16543 | } | |
0c77715b | 16544 | |
16545 | return ret; | |
16546 | } | |
16547 | ||
16548 | // Check whether the constant can be expressed in a complex type. | |
16549 | ||
16550 | bool | |
16551 | Numeric_constant::check_complex_type(Complex_type* type, bool issue_error, | |
d0bcce51 | 16552 | Location location) |
0c77715b | 16553 | { |
16554 | if (type->is_abstract()) | |
16555 | return true; | |
16556 | ||
16557 | mp_exp_t max_exp; | |
16558 | switch (type->bits()) | |
16559 | { | |
16560 | case 64: | |
16561 | max_exp = 128; | |
16562 | break; | |
16563 | case 128: | |
16564 | max_exp = 1024; | |
16565 | break; | |
16566 | default: | |
16567 | go_unreachable(); | |
16568 | } | |
16569 | ||
fcbea5e4 | 16570 | mpc_t val; |
16571 | mpc_init2(val, mpc_precision); | |
0c77715b | 16572 | switch (this->classification_) |
16573 | { | |
16574 | case NC_INT: | |
16575 | case NC_RUNE: | |
fcbea5e4 | 16576 | mpc_set_z(val, this->u_.int_val, MPC_RNDNN); |
0c77715b | 16577 | break; |
16578 | ||
16579 | case NC_FLOAT: | |
fcbea5e4 | 16580 | mpc_set_fr(val, this->u_.float_val, MPC_RNDNN); |
0c77715b | 16581 | break; |
16582 | ||
16583 | case NC_COMPLEX: | |
fcbea5e4 | 16584 | mpc_set(val, this->u_.complex_val, MPC_RNDNN); |
0c77715b | 16585 | break; |
16586 | ||
16587 | default: | |
16588 | go_unreachable(); | |
16589 | } | |
16590 | ||
d0bcce51 | 16591 | bool ret = true; |
fcbea5e4 | 16592 | if (!mpfr_nan_p(mpc_realref(val)) |
16593 | && !mpfr_inf_p(mpc_realref(val)) | |
16594 | && !mpfr_zero_p(mpc_realref(val)) | |
16595 | && mpfr_get_exp(mpc_realref(val)) > max_exp) | |
d0bcce51 | 16596 | { |
16597 | if (issue_error) | |
71a45216 | 16598 | { |
631d5788 | 16599 | go_error_at(location, "complex real part overflow"); |
71a45216 | 16600 | this->set_invalid(); |
16601 | } | |
d0bcce51 | 16602 | ret = false; |
16603 | } | |
0c77715b | 16604 | |
fcbea5e4 | 16605 | if (!mpfr_nan_p(mpc_imagref(val)) |
16606 | && !mpfr_inf_p(mpc_imagref(val)) | |
16607 | && !mpfr_zero_p(mpc_imagref(val)) | |
16608 | && mpfr_get_exp(mpc_imagref(val)) > max_exp) | |
d0bcce51 | 16609 | { |
16610 | if (issue_error) | |
71a45216 | 16611 | { |
631d5788 | 16612 | go_error_at(location, "complex imaginary part overflow"); |
71a45216 | 16613 | this->set_invalid(); |
16614 | } | |
d0bcce51 | 16615 | ret = false; |
16616 | } | |
0c77715b | 16617 | |
d0bcce51 | 16618 | if (ret) |
16619 | { | |
16620 | // Round the constant to the desired type. | |
fcbea5e4 | 16621 | mpc_t t; |
d0bcce51 | 16622 | switch (type->bits()) |
16623 | { | |
16624 | case 64: | |
fcbea5e4 | 16625 | mpc_init2(t, 24); |
d0bcce51 | 16626 | break; |
16627 | case 128: | |
fcbea5e4 | 16628 | mpc_init2(t, 53); |
d0bcce51 | 16629 | break; |
16630 | default: | |
16631 | go_unreachable(); | |
16632 | } | |
fcbea5e4 | 16633 | mpc_set(t, val, MPC_RNDNN); |
16634 | mpc_set(val, t, MPC_RNDNN); | |
16635 | mpc_clear(t); | |
d0bcce51 | 16636 | |
fcbea5e4 | 16637 | this->set_complex(type, val); |
d0bcce51 | 16638 | } |
16639 | ||
fcbea5e4 | 16640 | mpc_clear(val); |
0c77715b | 16641 | |
16642 | return ret; | |
16643 | } | |
16644 | ||
16645 | // Return an Expression for this value. | |
16646 | ||
16647 | Expression* | |
16648 | Numeric_constant::expression(Location loc) const | |
16649 | { | |
16650 | switch (this->classification_) | |
16651 | { | |
16652 | case NC_INT: | |
e67508fa | 16653 | return Expression::make_integer_z(&this->u_.int_val, this->type_, loc); |
0c77715b | 16654 | case NC_RUNE: |
16655 | return Expression::make_character(&this->u_.int_val, this->type_, loc); | |
16656 | case NC_FLOAT: | |
16657 | return Expression::make_float(&this->u_.float_val, this->type_, loc); | |
16658 | case NC_COMPLEX: | |
fcbea5e4 | 16659 | return Expression::make_complex(&this->u_.complex_val, this->type_, loc); |
71a45216 | 16660 | case NC_INVALID: |
16661 | go_assert(saw_errors()); | |
16662 | return Expression::make_error(loc); | |
0c77715b | 16663 | default: |
16664 | go_unreachable(); | |
16665 | } | |
16666 | } |