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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" | |
13 | #include "types.h" | |
14 | #include "export.h" | |
15 | #include "import.h" | |
16 | #include "statements.h" | |
17 | #include "lex.h" | |
a9182619 | 18 | #include "runtime.h" |
6e193e6f | 19 | #include "backend.h" |
e440a328 | 20 | #include "expressions.h" |
d751bb78 | 21 | #include "ast-dump.h" |
e440a328 | 22 | |
23 | // Class Expression. | |
24 | ||
25 | Expression::Expression(Expression_classification classification, | |
b13c66cd | 26 | Location location) |
e440a328 | 27 | : classification_(classification), location_(location) |
28 | { | |
29 | } | |
30 | ||
31 | Expression::~Expression() | |
32 | { | |
33 | } | |
34 | ||
e440a328 | 35 | // Traverse the expressions. |
36 | ||
37 | int | |
38 | Expression::traverse(Expression** pexpr, Traverse* traverse) | |
39 | { | |
40 | Expression* expr = *pexpr; | |
41 | if ((traverse->traverse_mask() & Traverse::traverse_expressions) != 0) | |
42 | { | |
43 | int t = traverse->expression(pexpr); | |
44 | if (t == TRAVERSE_EXIT) | |
45 | return TRAVERSE_EXIT; | |
46 | else if (t == TRAVERSE_SKIP_COMPONENTS) | |
47 | return TRAVERSE_CONTINUE; | |
48 | } | |
49 | return expr->do_traverse(traverse); | |
50 | } | |
51 | ||
52 | // Traverse subexpressions of this expression. | |
53 | ||
54 | int | |
55 | Expression::traverse_subexpressions(Traverse* traverse) | |
56 | { | |
57 | return this->do_traverse(traverse); | |
58 | } | |
59 | ||
60 | // Default implementation for do_traverse for child classes. | |
61 | ||
62 | int | |
63 | Expression::do_traverse(Traverse*) | |
64 | { | |
65 | return TRAVERSE_CONTINUE; | |
66 | } | |
67 | ||
68 | // This virtual function is called by the parser if the value of this | |
a7549a6a | 69 | // expression is being discarded. By default, we give an error. |
70 | // Expressions with side effects override. | |
e440a328 | 71 | |
4f2138d7 | 72 | bool |
e440a328 | 73 | Expression::do_discarding_value() |
74 | { | |
a7549a6a | 75 | this->unused_value_error(); |
4f2138d7 | 76 | return false; |
e440a328 | 77 | } |
78 | ||
79 | // This virtual function is called to export expressions. This will | |
80 | // only be used by expressions which may be constant. | |
81 | ||
82 | void | |
83 | Expression::do_export(Export*) const | |
84 | { | |
c3e6f413 | 85 | go_unreachable(); |
e440a328 | 86 | } |
87 | ||
a7549a6a | 88 | // Give an error saying that the value of the expression is not used. |
e440a328 | 89 | |
90 | void | |
a7549a6a | 91 | Expression::unused_value_error() |
e440a328 | 92 | { |
4f2138d7 | 93 | this->report_error(_("value computed is not used")); |
e440a328 | 94 | } |
95 | ||
96 | // Note that this expression is an error. This is called by children | |
97 | // when they discover an error. | |
98 | ||
99 | void | |
100 | Expression::set_is_error() | |
101 | { | |
102 | this->classification_ = EXPRESSION_ERROR; | |
103 | } | |
104 | ||
105 | // For children to call to report an error conveniently. | |
106 | ||
107 | void | |
108 | Expression::report_error(const char* msg) | |
109 | { | |
110 | error_at(this->location_, "%s", msg); | |
111 | this->set_is_error(); | |
112 | } | |
113 | ||
114 | // Set types of variables and constants. This is implemented by the | |
115 | // child class. | |
116 | ||
117 | void | |
118 | Expression::determine_type(const Type_context* context) | |
119 | { | |
120 | this->do_determine_type(context); | |
121 | } | |
122 | ||
123 | // Set types when there is no context. | |
124 | ||
125 | void | |
126 | Expression::determine_type_no_context() | |
127 | { | |
128 | Type_context context; | |
129 | this->do_determine_type(&context); | |
130 | } | |
131 | ||
2c809f8f | 132 | // Return an expression handling any conversions which must be done during |
e440a328 | 133 | // assignment. |
134 | ||
2c809f8f | 135 | Expression* |
b4a33049 | 136 | Expression::convert_for_assignment(Gogo*, Type* lhs_type, |
2c809f8f | 137 | Expression* rhs, Location location) |
e440a328 | 138 | { |
2c809f8f | 139 | Type* rhs_type = rhs->type(); |
140 | if (lhs_type->is_error() | |
141 | || rhs_type->is_error() | |
142 | || rhs->is_error_expression()) | |
143 | return Expression::make_error(location); | |
e440a328 | 144 | |
54211955 | 145 | if (lhs_type->forwarded() != rhs_type->forwarded() |
146 | && lhs_type->interface_type() != NULL) | |
e440a328 | 147 | { |
148 | if (rhs_type->interface_type() == NULL) | |
2c809f8f | 149 | return Expression::convert_type_to_interface(lhs_type, rhs, location); |
e440a328 | 150 | else |
2c809f8f | 151 | return Expression::convert_interface_to_interface(lhs_type, rhs, false, |
152 | location); | |
e440a328 | 153 | } |
54211955 | 154 | else if (lhs_type->forwarded() != rhs_type->forwarded() |
155 | && rhs_type->interface_type() != NULL) | |
2c809f8f | 156 | return Expression::convert_interface_to_type(lhs_type, rhs, location); |
411eb89e | 157 | else if (lhs_type->is_slice_type() && rhs_type->is_nil_type()) |
e440a328 | 158 | { |
2c809f8f | 159 | // Assigning nil to a slice. |
2c809f8f | 160 | Expression* nil = Expression::make_nil(location); |
e67508fa | 161 | Expression* zero = Expression::make_integer_ul(0, NULL, location); |
2c809f8f | 162 | return Expression::make_slice_value(lhs_type, nil, zero, zero, location); |
e440a328 | 163 | } |
164 | else if (rhs_type->is_nil_type()) | |
2c809f8f | 165 | return Expression::make_nil(location); |
166 | else if (Type::are_identical(lhs_type, rhs_type, false, NULL)) | |
e440a328 | 167 | { |
168 | // No conversion is needed. | |
2c809f8f | 169 | return rhs; |
170 | } | |
171 | else if (lhs_type->points_to() != NULL) | |
172 | return Expression::make_unsafe_cast(lhs_type, rhs, location); | |
173 | else if (lhs_type->is_numeric_type()) | |
174 | return Expression::make_cast(lhs_type, rhs, location); | |
175 | else if ((lhs_type->struct_type() != NULL | |
176 | && rhs_type->struct_type() != NULL) | |
177 | || (lhs_type->array_type() != NULL | |
178 | && rhs_type->array_type() != NULL)) | |
e440a328 | 179 | { |
180 | // This conversion must be permitted by Go, or we wouldn't have | |
181 | // gotten here. | |
2c809f8f | 182 | return Expression::make_unsafe_cast(lhs_type, rhs, location); |
e440a328 | 183 | } |
184 | else | |
2c809f8f | 185 | return rhs; |
e440a328 | 186 | } |
187 | ||
2c809f8f | 188 | // Return an expression for a conversion from a non-interface type to an |
e440a328 | 189 | // interface type. |
190 | ||
2c809f8f | 191 | Expression* |
192 | Expression::convert_type_to_interface(Type* lhs_type, Expression* rhs, | |
193 | Location location) | |
e440a328 | 194 | { |
e440a328 | 195 | Interface_type* lhs_interface_type = lhs_type->interface_type(); |
196 | bool lhs_is_empty = lhs_interface_type->is_empty(); | |
197 | ||
198 | // Since RHS_TYPE is a static type, we can create the interface | |
199 | // method table at compile time. | |
200 | ||
201 | // When setting an interface to nil, we just set both fields to | |
202 | // NULL. | |
2c809f8f | 203 | Type* rhs_type = rhs->type(); |
e440a328 | 204 | if (rhs_type->is_nil_type()) |
63697958 | 205 | { |
2c809f8f | 206 | Expression* nil = Expression::make_nil(location); |
207 | return Expression::make_interface_value(lhs_type, nil, nil, location); | |
63697958 | 208 | } |
e440a328 | 209 | |
210 | // This should have been checked already. | |
c484d925 | 211 | go_assert(lhs_interface_type->implements_interface(rhs_type, NULL)); |
e440a328 | 212 | |
e440a328 | 213 | // An interface is a tuple. If LHS_TYPE is an empty interface type, |
214 | // then the first field is the type descriptor for RHS_TYPE. | |
215 | // Otherwise it is the interface method table for RHS_TYPE. | |
2c809f8f | 216 | Expression* first_field; |
e440a328 | 217 | if (lhs_is_empty) |
2c809f8f | 218 | first_field = Expression::make_type_descriptor(rhs_type, location); |
e440a328 | 219 | else |
220 | { | |
221 | // Build the interface method table for this interface and this | |
222 | // object type: a list of function pointers for each interface | |
223 | // method. | |
224 | Named_type* rhs_named_type = rhs_type->named_type(); | |
c0cab2ec | 225 | Struct_type* rhs_struct_type = rhs_type->struct_type(); |
e440a328 | 226 | bool is_pointer = false; |
c0cab2ec | 227 | if (rhs_named_type == NULL && rhs_struct_type == NULL) |
e440a328 | 228 | { |
229 | rhs_named_type = rhs_type->deref()->named_type(); | |
c0cab2ec | 230 | rhs_struct_type = rhs_type->deref()->struct_type(); |
e440a328 | 231 | is_pointer = true; |
232 | } | |
c0cab2ec | 233 | if (rhs_named_type != NULL) |
2c809f8f | 234 | first_field = |
235 | rhs_named_type->interface_method_table(lhs_interface_type, | |
236 | is_pointer); | |
c0cab2ec | 237 | else if (rhs_struct_type != NULL) |
2c809f8f | 238 | first_field = |
239 | rhs_struct_type->interface_method_table(lhs_interface_type, | |
240 | is_pointer); | |
c0cab2ec | 241 | else |
2c809f8f | 242 | first_field = Expression::make_nil(location); |
e440a328 | 243 | } |
e440a328 | 244 | |
2c809f8f | 245 | Expression* obj; |
e440a328 | 246 | if (rhs_type->points_to() != NULL) |
247 | { | |
2c809f8f | 248 | // We are assigning a pointer to the interface; the interface |
e440a328 | 249 | // holds the pointer itself. |
2c809f8f | 250 | obj = rhs; |
251 | } | |
252 | else | |
253 | { | |
254 | // We are assigning a non-pointer value to the interface; the | |
255 | // interface gets a copy of the value in the heap. | |
256 | obj = Expression::make_heap_expression(rhs, location); | |
e440a328 | 257 | } |
258 | ||
2c809f8f | 259 | return Expression::make_interface_value(lhs_type, first_field, obj, location); |
260 | } | |
e440a328 | 261 | |
2c809f8f | 262 | // Return an expression for the type descriptor of RHS. |
e440a328 | 263 | |
2c809f8f | 264 | Expression* |
265 | Expression::get_interface_type_descriptor(Expression* rhs) | |
266 | { | |
267 | go_assert(rhs->type()->interface_type() != NULL); | |
268 | Location location = rhs->location(); | |
e440a328 | 269 | |
2c809f8f | 270 | // The type descriptor is the first field of an empty interface. |
271 | if (rhs->type()->interface_type()->is_empty()) | |
272 | return Expression::make_interface_info(rhs, INTERFACE_INFO_TYPE_DESCRIPTOR, | |
273 | location); | |
274 | ||
275 | Expression* mtable = | |
276 | Expression::make_interface_info(rhs, INTERFACE_INFO_METHODS, location); | |
e440a328 | 277 | |
2c809f8f | 278 | Expression* descriptor = |
279 | Expression::make_unary(OPERATOR_MULT, mtable, location); | |
280 | descriptor = Expression::make_field_reference(descriptor, 0, location); | |
281 | Expression* nil = Expression::make_nil(location); | |
e440a328 | 282 | |
2c809f8f | 283 | Expression* eq = |
284 | Expression::make_binary(OPERATOR_EQEQ, mtable, nil, location); | |
285 | return Expression::make_conditional(eq, nil, descriptor, location); | |
e440a328 | 286 | } |
287 | ||
2c809f8f | 288 | // Return an expression for the conversion of an interface type to an |
e440a328 | 289 | // interface type. |
290 | ||
2c809f8f | 291 | Expression* |
292 | Expression::convert_interface_to_interface(Type *lhs_type, Expression* rhs, | |
293 | bool for_type_guard, | |
294 | Location location) | |
e440a328 | 295 | { |
8ba8cc87 | 296 | if (Type::are_identical(lhs_type, rhs->type(), false, NULL)) |
297 | return rhs; | |
298 | ||
e440a328 | 299 | Interface_type* lhs_interface_type = lhs_type->interface_type(); |
300 | bool lhs_is_empty = lhs_interface_type->is_empty(); | |
301 | ||
e440a328 | 302 | // In the general case this requires runtime examination of the type |
303 | // method table to match it up with the interface methods. | |
304 | ||
305 | // FIXME: If all of the methods in the right hand side interface | |
306 | // also appear in the left hand side interface, then we don't need | |
307 | // to do a runtime check, although we still need to build a new | |
308 | // method table. | |
309 | ||
8ba8cc87 | 310 | // We are going to evaluate RHS multiple times. |
311 | go_assert(rhs->is_variable()); | |
312 | ||
e440a328 | 313 | // Get the type descriptor for the right hand side. This will be |
314 | // NULL for a nil interface. | |
2c809f8f | 315 | Expression* rhs_type_expr = Expression::get_interface_type_descriptor(rhs); |
316 | Expression* lhs_type_expr = | |
317 | Expression::make_type_descriptor(lhs_type, location); | |
e440a328 | 318 | |
2c809f8f | 319 | Expression* first_field; |
e440a328 | 320 | if (for_type_guard) |
321 | { | |
322 | // A type assertion fails when converting a nil interface. | |
2c809f8f | 323 | first_field = |
324 | Runtime::make_call(Runtime::ASSERT_INTERFACE, location, 2, | |
325 | lhs_type_expr, rhs_type_expr); | |
e440a328 | 326 | } |
327 | else if (lhs_is_empty) | |
328 | { | |
2c809f8f | 329 | // A conversion to an empty interface always succeeds, and the |
e440a328 | 330 | // first field is just the type descriptor of the object. |
2c809f8f | 331 | first_field = rhs_type_expr; |
e440a328 | 332 | } |
333 | else | |
334 | { | |
335 | // A conversion to a non-empty interface may fail, but unlike a | |
336 | // type assertion converting nil will always succeed. | |
2c809f8f | 337 | first_field = |
338 | Runtime::make_call(Runtime::CONVERT_INTERFACE, location, 2, | |
339 | lhs_type_expr, rhs_type_expr); | |
e440a328 | 340 | } |
341 | ||
342 | // The second field is simply the object pointer. | |
2c809f8f | 343 | Expression* obj = |
344 | Expression::make_interface_info(rhs, INTERFACE_INFO_OBJECT, location); | |
345 | return Expression::make_interface_value(lhs_type, first_field, obj, location); | |
e440a328 | 346 | } |
347 | ||
2c809f8f | 348 | // Return an expression for the conversion of an interface type to a |
e440a328 | 349 | // non-interface type. |
350 | ||
2c809f8f | 351 | Expression* |
352 | Expression::convert_interface_to_type(Type *lhs_type, Expression* rhs, | |
353 | Location location) | |
e440a328 | 354 | { |
8ba8cc87 | 355 | // We are going to evaluate RHS multiple times. |
356 | go_assert(rhs->is_variable()); | |
357 | ||
e440a328 | 358 | // Call a function to check that the type is valid. The function |
359 | // will panic with an appropriate runtime type error if the type is | |
360 | // not valid. | |
2c809f8f | 361 | Expression* lhs_type_expr = Expression::make_type_descriptor(lhs_type, |
362 | location); | |
363 | Expression* rhs_descriptor = | |
364 | Expression::get_interface_type_descriptor(rhs); | |
365 | ||
366 | Type* rhs_type = rhs->type(); | |
367 | Expression* rhs_inter_expr = Expression::make_type_descriptor(rhs_type, | |
368 | location); | |
369 | ||
370 | Expression* check_iface = Runtime::make_call(Runtime::CHECK_INTERFACE_TYPE, | |
371 | location, 3, lhs_type_expr, | |
372 | rhs_descriptor, rhs_inter_expr); | |
e440a328 | 373 | |
374 | // If the call succeeds, pull out the value. | |
2c809f8f | 375 | Expression* obj = Expression::make_interface_info(rhs, INTERFACE_INFO_OBJECT, |
376 | location); | |
e440a328 | 377 | |
378 | // If the value is a pointer, then it is the value we want. | |
379 | // Otherwise it points to the value. | |
380 | if (lhs_type->points_to() == NULL) | |
381 | { | |
2c809f8f | 382 | obj = Expression::make_unsafe_cast(Type::make_pointer_type(lhs_type), obj, |
383 | location); | |
384 | obj = Expression::make_unary(OPERATOR_MULT, obj, location); | |
e440a328 | 385 | } |
2c809f8f | 386 | return Expression::make_compound(check_iface, obj, location); |
e440a328 | 387 | } |
388 | ||
ea664253 | 389 | // Convert an expression to its backend representation. This is implemented by |
390 | // the child class. Not that it is not in general safe to call this multiple | |
e440a328 | 391 | // times for a single expression, but that we don't catch such errors. |
392 | ||
ea664253 | 393 | Bexpression* |
394 | Expression::get_backend(Translate_context* context) | |
e440a328 | 395 | { |
396 | // The child may have marked this expression as having an error. | |
397 | if (this->classification_ == EXPRESSION_ERROR) | |
ea664253 | 398 | return context->backend()->error_expression(); |
e440a328 | 399 | |
ea664253 | 400 | return this->do_get_backend(context); |
e440a328 | 401 | } |
402 | ||
48c2a53a | 403 | // Return a backend expression for VAL. |
404 | Bexpression* | |
405 | Expression::backend_numeric_constant_expression(Translate_context* context, | |
406 | Numeric_constant* val) | |
e440a328 | 407 | { |
48c2a53a | 408 | Gogo* gogo = context->gogo(); |
409 | Type* type = val->type(); | |
410 | if (type == NULL) | |
411 | return gogo->backend()->error_expression(); | |
e440a328 | 412 | |
48c2a53a | 413 | Btype* btype = type->get_backend(gogo); |
414 | Bexpression* ret; | |
415 | if (type->integer_type() != NULL) | |
e440a328 | 416 | { |
417 | mpz_t ival; | |
48c2a53a | 418 | if (!val->to_int(&ival)) |
419 | { | |
420 | go_assert(saw_errors()); | |
421 | return gogo->backend()->error_expression(); | |
422 | } | |
423 | ret = gogo->backend()->integer_constant_expression(btype, ival); | |
e440a328 | 424 | mpz_clear(ival); |
e440a328 | 425 | } |
48c2a53a | 426 | else if (type->float_type() != NULL) |
e440a328 | 427 | { |
48c2a53a | 428 | mpfr_t fval; |
429 | if (!val->to_float(&fval)) | |
430 | { | |
431 | go_assert(saw_errors()); | |
432 | return gogo->backend()->error_expression(); | |
433 | } | |
434 | ret = gogo->backend()->float_constant_expression(btype, fval); | |
435 | mpfr_clear(fval); | |
e440a328 | 436 | } |
48c2a53a | 437 | else if (type->complex_type() != NULL) |
e440a328 | 438 | { |
fcbea5e4 | 439 | mpc_t cval; |
440 | if (!val->to_complex(&cval)) | |
48c2a53a | 441 | { |
442 | go_assert(saw_errors()); | |
443 | return gogo->backend()->error_expression(); | |
444 | } | |
fcbea5e4 | 445 | ret = gogo->backend()->complex_constant_expression(btype, cval); |
446 | mpc_clear(cval); | |
e440a328 | 447 | } |
448 | else | |
c3e6f413 | 449 | go_unreachable(); |
e440a328 | 450 | |
48c2a53a | 451 | return ret; |
e440a328 | 452 | } |
453 | ||
2c809f8f | 454 | // Return an expression which evaluates to true if VAL, of arbitrary integer |
455 | // type, is negative or is more than the maximum value of the Go type "int". | |
e440a328 | 456 | |
2c809f8f | 457 | Expression* |
458 | Expression::check_bounds(Expression* val, Location loc) | |
e440a328 | 459 | { |
2c809f8f | 460 | Type* val_type = val->type(); |
461 | Type* bound_type = Type::lookup_integer_type("int"); | |
462 | ||
463 | int val_type_size; | |
464 | bool val_is_unsigned = false; | |
465 | if (val_type->integer_type() != NULL) | |
466 | { | |
467 | val_type_size = val_type->integer_type()->bits(); | |
468 | val_is_unsigned = val_type->integer_type()->is_unsigned(); | |
469 | } | |
470 | else | |
471 | { | |
472 | if (!val_type->is_numeric_type() | |
473 | || !Type::are_convertible(bound_type, val_type, NULL)) | |
474 | { | |
475 | go_assert(saw_errors()); | |
476 | return Expression::make_boolean(true, loc); | |
477 | } | |
e440a328 | 478 | |
2c809f8f | 479 | if (val_type->complex_type() != NULL) |
480 | val_type_size = val_type->complex_type()->bits(); | |
481 | else | |
482 | val_type_size = val_type->float_type()->bits(); | |
483 | } | |
484 | ||
485 | Expression* negative_index = Expression::make_boolean(false, loc); | |
486 | Expression* index_overflows = Expression::make_boolean(false, loc); | |
487 | if (!val_is_unsigned) | |
e440a328 | 488 | { |
e67508fa | 489 | Expression* zero = Expression::make_integer_ul(0, val_type, loc); |
2c809f8f | 490 | negative_index = Expression::make_binary(OPERATOR_LT, val, zero, loc); |
e440a328 | 491 | } |
492 | ||
2c809f8f | 493 | int bound_type_size = bound_type->integer_type()->bits(); |
c3068ac0 | 494 | if (val_type_size > bound_type_size |
495 | || (val_type_size == bound_type_size | |
2c809f8f | 496 | && val_is_unsigned)) |
497 | { | |
498 | mpz_t one; | |
499 | mpz_init_set_ui(one, 1UL); | |
500 | ||
501 | // maxval = 2^(bound_type_size - 1) - 1 | |
502 | mpz_t maxval; | |
503 | mpz_init(maxval); | |
504 | mpz_mul_2exp(maxval, one, bound_type_size - 1); | |
505 | mpz_sub_ui(maxval, maxval, 1); | |
e67508fa | 506 | Expression* max = Expression::make_integer_z(&maxval, val_type, loc); |
2c809f8f | 507 | mpz_clear(one); |
508 | mpz_clear(maxval); | |
509 | ||
510 | index_overflows = Expression::make_binary(OPERATOR_GT, val, max, loc); | |
e440a328 | 511 | } |
512 | ||
2c809f8f | 513 | return Expression::make_binary(OPERATOR_OROR, negative_index, index_overflows, |
514 | loc); | |
e440a328 | 515 | } |
516 | ||
d751bb78 | 517 | void |
518 | Expression::dump_expression(Ast_dump_context* ast_dump_context) const | |
519 | { | |
520 | this->do_dump_expression(ast_dump_context); | |
521 | } | |
522 | ||
e440a328 | 523 | // Error expressions. This are used to avoid cascading errors. |
524 | ||
525 | class Error_expression : public Expression | |
526 | { | |
527 | public: | |
b13c66cd | 528 | Error_expression(Location location) |
e440a328 | 529 | : Expression(EXPRESSION_ERROR, location) |
530 | { } | |
531 | ||
532 | protected: | |
533 | bool | |
534 | do_is_constant() const | |
535 | { return true; } | |
536 | ||
0e168074 | 537 | bool |
538 | do_is_immutable() const | |
539 | { return true; } | |
540 | ||
e440a328 | 541 | bool |
0c77715b | 542 | do_numeric_constant_value(Numeric_constant* nc) const |
e440a328 | 543 | { |
0c77715b | 544 | nc->set_unsigned_long(NULL, 0); |
e440a328 | 545 | return true; |
546 | } | |
547 | ||
4f2138d7 | 548 | bool |
e440a328 | 549 | do_discarding_value() |
4f2138d7 | 550 | { return true; } |
e440a328 | 551 | |
552 | Type* | |
553 | do_type() | |
554 | { return Type::make_error_type(); } | |
555 | ||
556 | void | |
557 | do_determine_type(const Type_context*) | |
558 | { } | |
559 | ||
560 | Expression* | |
561 | do_copy() | |
562 | { return this; } | |
563 | ||
564 | bool | |
565 | do_is_addressable() const | |
566 | { return true; } | |
567 | ||
ea664253 | 568 | Bexpression* |
569 | do_get_backend(Translate_context* context) | |
570 | { return context->backend()->error_expression(); } | |
d751bb78 | 571 | |
572 | void | |
573 | do_dump_expression(Ast_dump_context*) const; | |
e440a328 | 574 | }; |
575 | ||
d751bb78 | 576 | // Dump the ast representation for an error expression to a dump context. |
577 | ||
578 | void | |
579 | Error_expression::do_dump_expression(Ast_dump_context* ast_dump_context) const | |
580 | { | |
581 | ast_dump_context->ostream() << "_Error_" ; | |
582 | } | |
583 | ||
e440a328 | 584 | Expression* |
b13c66cd | 585 | Expression::make_error(Location location) |
e440a328 | 586 | { |
587 | return new Error_expression(location); | |
588 | } | |
589 | ||
590 | // An expression which is really a type. This is used during parsing. | |
591 | // It is an error if these survive after lowering. | |
592 | ||
593 | class | |
594 | Type_expression : public Expression | |
595 | { | |
596 | public: | |
b13c66cd | 597 | Type_expression(Type* type, Location location) |
e440a328 | 598 | : Expression(EXPRESSION_TYPE, location), |
599 | type_(type) | |
600 | { } | |
601 | ||
602 | protected: | |
603 | int | |
604 | do_traverse(Traverse* traverse) | |
605 | { return Type::traverse(this->type_, traverse); } | |
606 | ||
607 | Type* | |
608 | do_type() | |
609 | { return this->type_; } | |
610 | ||
611 | void | |
612 | do_determine_type(const Type_context*) | |
613 | { } | |
614 | ||
615 | void | |
616 | do_check_types(Gogo*) | |
617 | { this->report_error(_("invalid use of type")); } | |
618 | ||
619 | Expression* | |
620 | do_copy() | |
621 | { return this; } | |
622 | ||
ea664253 | 623 | Bexpression* |
624 | do_get_backend(Translate_context*) | |
c3e6f413 | 625 | { go_unreachable(); } |
e440a328 | 626 | |
d751bb78 | 627 | void do_dump_expression(Ast_dump_context*) const; |
628 | ||
e440a328 | 629 | private: |
630 | // The type which we are representing as an expression. | |
631 | Type* type_; | |
632 | }; | |
633 | ||
d751bb78 | 634 | void |
635 | Type_expression::do_dump_expression(Ast_dump_context* ast_dump_context) const | |
636 | { | |
637 | ast_dump_context->dump_type(this->type_); | |
638 | } | |
639 | ||
e440a328 | 640 | Expression* |
b13c66cd | 641 | Expression::make_type(Type* type, Location location) |
e440a328 | 642 | { |
643 | return new Type_expression(type, location); | |
644 | } | |
645 | ||
e03bdf36 | 646 | // Class Parser_expression. |
647 | ||
648 | Type* | |
649 | Parser_expression::do_type() | |
650 | { | |
651 | // We should never really ask for the type of a Parser_expression. | |
652 | // However, it can happen, at least when we have an invalid const | |
653 | // whose initializer refers to the const itself. In that case we | |
654 | // may ask for the type when lowering the const itself. | |
c484d925 | 655 | go_assert(saw_errors()); |
e03bdf36 | 656 | return Type::make_error_type(); |
657 | } | |
658 | ||
e440a328 | 659 | // Class Var_expression. |
660 | ||
661 | // Lower a variable expression. Here we just make sure that the | |
662 | // initialization expression of the variable has been lowered. This | |
663 | // ensures that we will be able to determine the type of the variable | |
664 | // if necessary. | |
665 | ||
666 | Expression* | |
ceeb4318 | 667 | Var_expression::do_lower(Gogo* gogo, Named_object* function, |
668 | Statement_inserter* inserter, int) | |
e440a328 | 669 | { |
670 | if (this->variable_->is_variable()) | |
671 | { | |
672 | Variable* var = this->variable_->var_value(); | |
673 | // This is either a local variable or a global variable. A | |
674 | // reference to a variable which is local to an enclosing | |
675 | // function will be a reference to a field in a closure. | |
676 | if (var->is_global()) | |
ceeb4318 | 677 | { |
678 | function = NULL; | |
679 | inserter = NULL; | |
680 | } | |
681 | var->lower_init_expression(gogo, function, inserter); | |
e440a328 | 682 | } |
683 | return this; | |
684 | } | |
685 | ||
e440a328 | 686 | // Return the type of a reference to a variable. |
687 | ||
688 | Type* | |
689 | Var_expression::do_type() | |
690 | { | |
691 | if (this->variable_->is_variable()) | |
692 | return this->variable_->var_value()->type(); | |
693 | else if (this->variable_->is_result_variable()) | |
694 | return this->variable_->result_var_value()->type(); | |
695 | else | |
c3e6f413 | 696 | go_unreachable(); |
e440a328 | 697 | } |
698 | ||
0ab09e06 | 699 | // Determine the type of a reference to a variable. |
700 | ||
701 | void | |
702 | Var_expression::do_determine_type(const Type_context*) | |
703 | { | |
704 | if (this->variable_->is_variable()) | |
705 | this->variable_->var_value()->determine_type(); | |
706 | } | |
707 | ||
e440a328 | 708 | // Something takes the address of this variable. This means that we |
709 | // may want to move the variable onto the heap. | |
710 | ||
711 | void | |
712 | Var_expression::do_address_taken(bool escapes) | |
713 | { | |
714 | if (!escapes) | |
f325319b | 715 | { |
716 | if (this->variable_->is_variable()) | |
717 | this->variable_->var_value()->set_non_escaping_address_taken(); | |
718 | else if (this->variable_->is_result_variable()) | |
719 | this->variable_->result_var_value()->set_non_escaping_address_taken(); | |
720 | else | |
721 | go_unreachable(); | |
722 | } | |
e440a328 | 723 | else |
f325319b | 724 | { |
725 | if (this->variable_->is_variable()) | |
726 | this->variable_->var_value()->set_address_taken(); | |
727 | else if (this->variable_->is_result_variable()) | |
728 | this->variable_->result_var_value()->set_address_taken(); | |
729 | else | |
730 | go_unreachable(); | |
731 | } | |
e440a328 | 732 | } |
733 | ||
ea664253 | 734 | // Get the backend representation for a reference to a variable. |
e440a328 | 735 | |
ea664253 | 736 | Bexpression* |
737 | Var_expression::do_get_backend(Translate_context* context) | |
e440a328 | 738 | { |
fe2f84cf | 739 | Bvariable* bvar = this->variable_->get_backend_variable(context->gogo(), |
740 | context->function()); | |
fe2f84cf | 741 | bool is_in_heap; |
c6777780 | 742 | Location loc = this->location(); |
9b27b43c | 743 | Btype* btype; |
744 | Gogo* gogo = context->gogo(); | |
fe2f84cf | 745 | if (this->variable_->is_variable()) |
9b27b43c | 746 | { |
747 | is_in_heap = this->variable_->var_value()->is_in_heap(); | |
748 | btype = this->variable_->var_value()->type()->get_backend(gogo); | |
749 | } | |
fe2f84cf | 750 | else if (this->variable_->is_result_variable()) |
9b27b43c | 751 | { |
752 | is_in_heap = this->variable_->result_var_value()->is_in_heap(); | |
753 | btype = this->variable_->result_var_value()->type()->get_backend(gogo); | |
754 | } | |
fe2f84cf | 755 | else |
c3e6f413 | 756 | go_unreachable(); |
c6777780 | 757 | |
758 | Bexpression* ret = context->backend()->var_expression(bvar, loc); | |
fe2f84cf | 759 | if (is_in_heap) |
9b27b43c | 760 | ret = context->backend()->indirect_expression(btype, ret, true, loc); |
ea664253 | 761 | return ret; |
e440a328 | 762 | } |
763 | ||
d751bb78 | 764 | // Ast dump for variable expression. |
765 | ||
766 | void | |
767 | Var_expression::do_dump_expression(Ast_dump_context* ast_dump_context) const | |
768 | { | |
769 | ast_dump_context->ostream() << this->variable_->name() ; | |
770 | } | |
771 | ||
e440a328 | 772 | // Make a reference to a variable in an expression. |
773 | ||
774 | Expression* | |
b13c66cd | 775 | Expression::make_var_reference(Named_object* var, Location location) |
e440a328 | 776 | { |
777 | if (var->is_sink()) | |
778 | return Expression::make_sink(location); | |
779 | ||
780 | // FIXME: Creating a new object for each reference to a variable is | |
781 | // wasteful. | |
782 | return new Var_expression(var, location); | |
783 | } | |
784 | ||
785 | // Class Temporary_reference_expression. | |
786 | ||
787 | // The type. | |
788 | ||
789 | Type* | |
790 | Temporary_reference_expression::do_type() | |
791 | { | |
792 | return this->statement_->type(); | |
793 | } | |
794 | ||
795 | // Called if something takes the address of this temporary variable. | |
796 | // We never have to move temporary variables to the heap, but we do | |
797 | // need to know that they must live in the stack rather than in a | |
798 | // register. | |
799 | ||
800 | void | |
801 | Temporary_reference_expression::do_address_taken(bool) | |
802 | { | |
803 | this->statement_->set_is_address_taken(); | |
804 | } | |
805 | ||
ea664253 | 806 | // Get a backend expression referring to the variable. |
e440a328 | 807 | |
ea664253 | 808 | Bexpression* |
809 | Temporary_reference_expression::do_get_backend(Translate_context* context) | |
e440a328 | 810 | { |
cd440cff | 811 | Gogo* gogo = context->gogo(); |
eefc1ed3 | 812 | Bvariable* bvar = this->statement_->get_backend_variable(context); |
cd440cff | 813 | Bexpression* ret = gogo->backend()->var_expression(bvar, this->location()); |
eefc1ed3 | 814 | |
cd440cff | 815 | // The backend can't always represent the same set of recursive types |
eefc1ed3 | 816 | // that the Go frontend can. In some cases this means that a |
817 | // temporary variable won't have the right backend type. Correct | |
818 | // that here by adding a type cast. We need to use base() to push | |
819 | // the circularity down one level. | |
cd440cff | 820 | Type* stype = this->statement_->type(); |
ceeb4318 | 821 | if (!this->is_lvalue_ |
cd440cff | 822 | && stype->has_pointer() |
823 | && stype->deref()->is_void_type()) | |
eefc1ed3 | 824 | { |
cd440cff | 825 | Btype* btype = this->type()->base()->get_backend(gogo); |
826 | ret = gogo->backend()->convert_expression(btype, ret, this->location()); | |
eefc1ed3 | 827 | } |
ea664253 | 828 | return ret; |
e440a328 | 829 | } |
830 | ||
d751bb78 | 831 | // Ast dump for temporary reference. |
832 | ||
833 | void | |
834 | Temporary_reference_expression::do_dump_expression( | |
835 | Ast_dump_context* ast_dump_context) const | |
836 | { | |
837 | ast_dump_context->dump_temp_variable_name(this->statement_); | |
838 | } | |
839 | ||
e440a328 | 840 | // Make a reference to a temporary variable. |
841 | ||
ceeb4318 | 842 | Temporary_reference_expression* |
e440a328 | 843 | Expression::make_temporary_reference(Temporary_statement* statement, |
b13c66cd | 844 | Location location) |
e440a328 | 845 | { |
846 | return new Temporary_reference_expression(statement, location); | |
847 | } | |
848 | ||
e9d3367e | 849 | // Class Set_and_use_temporary_expression. |
850 | ||
851 | // Return the type. | |
852 | ||
853 | Type* | |
854 | Set_and_use_temporary_expression::do_type() | |
855 | { | |
856 | return this->statement_->type(); | |
857 | } | |
858 | ||
0afbb937 | 859 | // Determine the type of the expression. |
860 | ||
861 | void | |
862 | Set_and_use_temporary_expression::do_determine_type( | |
863 | const Type_context* context) | |
864 | { | |
865 | this->expr_->determine_type(context); | |
866 | } | |
867 | ||
e9d3367e | 868 | // Take the address. |
869 | ||
870 | void | |
871 | Set_and_use_temporary_expression::do_address_taken(bool) | |
872 | { | |
873 | this->statement_->set_is_address_taken(); | |
874 | } | |
875 | ||
876 | // Return the backend representation. | |
877 | ||
ea664253 | 878 | Bexpression* |
879 | Set_and_use_temporary_expression::do_get_backend(Translate_context* context) | |
e9d3367e | 880 | { |
e9d3367e | 881 | Location loc = this->location(); |
a302c105 | 882 | Gogo* gogo = context->gogo(); |
883 | Bvariable* bvar = this->statement_->get_backend_variable(context); | |
884 | Bexpression* var_ref = gogo->backend()->var_expression(bvar, loc); | |
885 | ||
ea664253 | 886 | Bexpression* bexpr = this->expr_->get_backend(context); |
a302c105 | 887 | Bstatement* set = gogo->backend()->assignment_statement(var_ref, bexpr, loc); |
888 | var_ref = gogo->backend()->var_expression(bvar, loc); | |
889 | Bexpression* ret = gogo->backend()->compound_expression(set, var_ref, loc); | |
ea664253 | 890 | return ret; |
e9d3367e | 891 | } |
892 | ||
893 | // Dump. | |
894 | ||
895 | void | |
896 | Set_and_use_temporary_expression::do_dump_expression( | |
897 | Ast_dump_context* ast_dump_context) const | |
898 | { | |
899 | ast_dump_context->ostream() << '('; | |
900 | ast_dump_context->dump_temp_variable_name(this->statement_); | |
901 | ast_dump_context->ostream() << " = "; | |
902 | this->expr_->dump_expression(ast_dump_context); | |
903 | ast_dump_context->ostream() << ')'; | |
904 | } | |
905 | ||
906 | // Make a set-and-use temporary. | |
907 | ||
908 | Set_and_use_temporary_expression* | |
909 | Expression::make_set_and_use_temporary(Temporary_statement* statement, | |
910 | Expression* expr, Location location) | |
911 | { | |
912 | return new Set_and_use_temporary_expression(statement, expr, location); | |
913 | } | |
914 | ||
e440a328 | 915 | // A sink expression--a use of the blank identifier _. |
916 | ||
917 | class Sink_expression : public Expression | |
918 | { | |
919 | public: | |
b13c66cd | 920 | Sink_expression(Location location) |
e440a328 | 921 | : Expression(EXPRESSION_SINK, location), |
aa93217a | 922 | type_(NULL), bvar_(NULL) |
e440a328 | 923 | { } |
924 | ||
925 | protected: | |
4f2138d7 | 926 | bool |
e440a328 | 927 | do_discarding_value() |
4f2138d7 | 928 | { return true; } |
e440a328 | 929 | |
930 | Type* | |
931 | do_type(); | |
932 | ||
933 | void | |
934 | do_determine_type(const Type_context*); | |
935 | ||
936 | Expression* | |
937 | do_copy() | |
938 | { return new Sink_expression(this->location()); } | |
939 | ||
ea664253 | 940 | Bexpression* |
941 | do_get_backend(Translate_context*); | |
e440a328 | 942 | |
d751bb78 | 943 | void |
944 | do_dump_expression(Ast_dump_context*) const; | |
945 | ||
e440a328 | 946 | private: |
947 | // The type of this sink variable. | |
948 | Type* type_; | |
949 | // The temporary variable we generate. | |
aa93217a | 950 | Bvariable* bvar_; |
e440a328 | 951 | }; |
952 | ||
953 | // Return the type of a sink expression. | |
954 | ||
955 | Type* | |
956 | Sink_expression::do_type() | |
957 | { | |
958 | if (this->type_ == NULL) | |
959 | return Type::make_sink_type(); | |
960 | return this->type_; | |
961 | } | |
962 | ||
963 | // Determine the type of a sink expression. | |
964 | ||
965 | void | |
966 | Sink_expression::do_determine_type(const Type_context* context) | |
967 | { | |
968 | if (context->type != NULL) | |
969 | this->type_ = context->type; | |
970 | } | |
971 | ||
972 | // Return a temporary variable for a sink expression. This will | |
973 | // presumably be a write-only variable which the middle-end will drop. | |
974 | ||
ea664253 | 975 | Bexpression* |
976 | Sink_expression::do_get_backend(Translate_context* context) | |
e440a328 | 977 | { |
aa93217a | 978 | Location loc = this->location(); |
979 | Gogo* gogo = context->gogo(); | |
980 | if (this->bvar_ == NULL) | |
e440a328 | 981 | { |
c484d925 | 982 | go_assert(this->type_ != NULL && !this->type_->is_sink_type()); |
aa93217a | 983 | Named_object* fn = context->function(); |
984 | go_assert(fn != NULL); | |
985 | Bfunction* fn_ctx = fn->func_value()->get_or_make_decl(gogo, fn); | |
9f0e0513 | 986 | Btype* bt = this->type_->get_backend(context->gogo()); |
aa93217a | 987 | Bstatement* decl; |
988 | this->bvar_ = | |
989 | gogo->backend()->temporary_variable(fn_ctx, context->bblock(), bt, NULL, | |
990 | false, loc, &decl); | |
991 | Bexpression* var_ref = gogo->backend()->var_expression(this->bvar_, loc); | |
992 | var_ref = gogo->backend()->compound_expression(decl, var_ref, loc); | |
ea664253 | 993 | return var_ref; |
e440a328 | 994 | } |
ea664253 | 995 | return gogo->backend()->var_expression(this->bvar_, loc); |
e440a328 | 996 | } |
997 | ||
d751bb78 | 998 | // Ast dump for sink expression. |
999 | ||
1000 | void | |
1001 | Sink_expression::do_dump_expression(Ast_dump_context* ast_dump_context) const | |
1002 | { | |
1003 | ast_dump_context->ostream() << "_" ; | |
1004 | } | |
1005 | ||
e440a328 | 1006 | // Make a sink expression. |
1007 | ||
1008 | Expression* | |
b13c66cd | 1009 | Expression::make_sink(Location location) |
e440a328 | 1010 | { |
1011 | return new Sink_expression(location); | |
1012 | } | |
1013 | ||
1014 | // Class Func_expression. | |
1015 | ||
1016 | // FIXME: Can a function expression appear in a constant expression? | |
1017 | // The value is unchanging. Initializing a constant to the address of | |
1018 | // a function seems like it could work, though there might be little | |
1019 | // point to it. | |
1020 | ||
e440a328 | 1021 | // Traversal. |
1022 | ||
1023 | int | |
1024 | Func_expression::do_traverse(Traverse* traverse) | |
1025 | { | |
1026 | return (this->closure_ == NULL | |
1027 | ? TRAVERSE_CONTINUE | |
1028 | : Expression::traverse(&this->closure_, traverse)); | |
1029 | } | |
1030 | ||
1031 | // Return the type of a function expression. | |
1032 | ||
1033 | Type* | |
1034 | Func_expression::do_type() | |
1035 | { | |
1036 | if (this->function_->is_function()) | |
1037 | return this->function_->func_value()->type(); | |
1038 | else if (this->function_->is_function_declaration()) | |
1039 | return this->function_->func_declaration_value()->type(); | |
1040 | else | |
c3e6f413 | 1041 | go_unreachable(); |
e440a328 | 1042 | } |
1043 | ||
ea664253 | 1044 | // Get the backend representation for the code of a function expression. |
e440a328 | 1045 | |
97267c39 | 1046 | Bexpression* |
8381eda7 | 1047 | Func_expression::get_code_pointer(Gogo* gogo, Named_object* no, Location loc) |
e440a328 | 1048 | { |
1049 | Function_type* fntype; | |
8381eda7 | 1050 | if (no->is_function()) |
1051 | fntype = no->func_value()->type(); | |
1052 | else if (no->is_function_declaration()) | |
1053 | fntype = no->func_declaration_value()->type(); | |
e440a328 | 1054 | else |
c3e6f413 | 1055 | go_unreachable(); |
e440a328 | 1056 | |
1057 | // Builtin functions are handled specially by Call_expression. We | |
1058 | // can't take their address. | |
1059 | if (fntype->is_builtin()) | |
1060 | { | |
8381eda7 | 1061 | error_at(loc, |
cb0e02f3 | 1062 | "invalid use of special builtin function %qs; must be called", |
8381eda7 | 1063 | no->message_name().c_str()); |
97267c39 | 1064 | return gogo->backend()->error_expression(); |
e440a328 | 1065 | } |
1066 | ||
97267c39 | 1067 | Bfunction* fndecl; |
e440a328 | 1068 | if (no->is_function()) |
cf3cae55 | 1069 | fndecl = no->func_value()->get_or_make_decl(gogo, no); |
e440a328 | 1070 | else if (no->is_function_declaration()) |
cf3cae55 | 1071 | fndecl = no->func_declaration_value()->get_or_make_decl(gogo, no); |
e440a328 | 1072 | else |
c3e6f413 | 1073 | go_unreachable(); |
e440a328 | 1074 | |
97267c39 | 1075 | return gogo->backend()->function_code_expression(fndecl, loc); |
e440a328 | 1076 | } |
1077 | ||
ea664253 | 1078 | // Get the backend representation for a function expression. This is used when |
1079 | // we take the address of a function rather than simply calling it. A func | |
8381eda7 | 1080 | // value is represented as a pointer to a block of memory. The first |
1081 | // word of that memory is a pointer to the function code. The | |
1082 | // remaining parts of that memory are the addresses of variables that | |
1083 | // the function closes over. | |
e440a328 | 1084 | |
ea664253 | 1085 | Bexpression* |
1086 | Func_expression::do_get_backend(Translate_context* context) | |
e440a328 | 1087 | { |
8381eda7 | 1088 | // If there is no closure, just use the function descriptor. |
2010c17a | 1089 | if (this->closure_ == NULL) |
8381eda7 | 1090 | { |
1091 | Gogo* gogo = context->gogo(); | |
1092 | Named_object* no = this->function_; | |
1093 | Expression* descriptor; | |
1094 | if (no->is_function()) | |
1095 | descriptor = no->func_value()->descriptor(gogo, no); | |
1096 | else if (no->is_function_declaration()) | |
1097 | { | |
1098 | if (no->func_declaration_value()->type()->is_builtin()) | |
1099 | { | |
1100 | error_at(this->location(), | |
1101 | ("invalid use of special builtin function %qs; " | |
1102 | "must be called"), | |
1103 | no->message_name().c_str()); | |
ea664253 | 1104 | return gogo->backend()->error_expression(); |
8381eda7 | 1105 | } |
1106 | descriptor = no->func_declaration_value()->descriptor(gogo, no); | |
1107 | } | |
1108 | else | |
1109 | go_unreachable(); | |
2010c17a | 1110 | |
ea664253 | 1111 | Bexpression* bdesc = descriptor->get_backend(context); |
1112 | return gogo->backend()->address_expression(bdesc, this->location()); | |
8381eda7 | 1113 | } |
e440a328 | 1114 | |
8381eda7 | 1115 | go_assert(this->function_->func_value()->enclosing() != NULL); |
e440a328 | 1116 | |
8381eda7 | 1117 | // If there is a closure, then the closure is itself the function |
1118 | // expression. It is a pointer to a struct whose first field points | |
1119 | // to the function code and whose remaining fields are the addresses | |
1120 | // of the closed-over variables. | |
ea664253 | 1121 | return this->closure_->get_backend(context); |
e440a328 | 1122 | } |
1123 | ||
d751bb78 | 1124 | // Ast dump for function. |
1125 | ||
1126 | void | |
1127 | Func_expression::do_dump_expression(Ast_dump_context* ast_dump_context) const | |
1128 | { | |
8b1c301d | 1129 | ast_dump_context->ostream() << this->function_->name(); |
1130 | if (this->closure_ != NULL) | |
1131 | { | |
1132 | ast_dump_context->ostream() << " {closure = "; | |
1133 | this->closure_->dump_expression(ast_dump_context); | |
1134 | ast_dump_context->ostream() << "}"; | |
1135 | } | |
d751bb78 | 1136 | } |
1137 | ||
e440a328 | 1138 | // Make a reference to a function in an expression. |
1139 | ||
1140 | Expression* | |
1141 | Expression::make_func_reference(Named_object* function, Expression* closure, | |
b13c66cd | 1142 | Location location) |
e440a328 | 1143 | { |
1144 | return new Func_expression(function, closure, location); | |
1145 | } | |
1146 | ||
c6837989 | 1147 | // Class Func_descriptor_expression. |
8381eda7 | 1148 | |
c6837989 | 1149 | // Constructor. |
8381eda7 | 1150 | |
c6837989 | 1151 | Func_descriptor_expression::Func_descriptor_expression(Named_object* fn) |
1152 | : Expression(EXPRESSION_FUNC_DESCRIPTOR, fn->location()), | |
f8bdf81a | 1153 | fn_(fn), dvar_(NULL) |
c6837989 | 1154 | { |
1155 | go_assert(!fn->is_function() || !fn->func_value()->needs_closure()); | |
1156 | } | |
8381eda7 | 1157 | |
c6837989 | 1158 | // Traversal. |
8381eda7 | 1159 | |
c6837989 | 1160 | int |
1161 | Func_descriptor_expression::do_traverse(Traverse*) | |
1162 | { | |
1163 | return TRAVERSE_CONTINUE; | |
1164 | } | |
8381eda7 | 1165 | |
1166 | // All function descriptors have the same type. | |
1167 | ||
1168 | Type* Func_descriptor_expression::descriptor_type; | |
1169 | ||
1170 | void | |
1171 | Func_descriptor_expression::make_func_descriptor_type() | |
1172 | { | |
1173 | if (Func_descriptor_expression::descriptor_type != NULL) | |
1174 | return; | |
1175 | Type* uintptr_type = Type::lookup_integer_type("uintptr"); | |
1176 | Type* struct_type = Type::make_builtin_struct_type(1, "code", uintptr_type); | |
1177 | Func_descriptor_expression::descriptor_type = | |
1178 | Type::make_builtin_named_type("functionDescriptor", struct_type); | |
1179 | } | |
1180 | ||
1181 | Type* | |
1182 | Func_descriptor_expression::do_type() | |
1183 | { | |
1184 | Func_descriptor_expression::make_func_descriptor_type(); | |
1185 | return Func_descriptor_expression::descriptor_type; | |
1186 | } | |
1187 | ||
ea664253 | 1188 | // The backend representation for a function descriptor. |
8381eda7 | 1189 | |
ea664253 | 1190 | Bexpression* |
1191 | Func_descriptor_expression::do_get_backend(Translate_context* context) | |
8381eda7 | 1192 | { |
8381eda7 | 1193 | Named_object* no = this->fn_; |
1194 | Location loc = no->location(); | |
ea664253 | 1195 | if (this->dvar_ != NULL) |
1196 | return context->backend()->var_expression(this->dvar_, loc); | |
8381eda7 | 1197 | |
ea664253 | 1198 | Gogo* gogo = context->gogo(); |
8381eda7 | 1199 | std::string var_name; |
1200 | if (no->package() == NULL) | |
1201 | var_name = gogo->pkgpath_symbol(); | |
1202 | else | |
1203 | var_name = no->package()->pkgpath_symbol(); | |
1204 | var_name.push_back('.'); | |
1205 | var_name.append(Gogo::unpack_hidden_name(no->name())); | |
1206 | var_name.append("$descriptor"); | |
1207 | ||
1208 | Btype* btype = this->type()->get_backend(gogo); | |
1209 | ||
1210 | Bvariable* bvar; | |
1211 | if (no->package() != NULL | |
1212 | || Linemap::is_predeclared_location(no->location())) | |
f8bdf81a | 1213 | bvar = context->backend()->immutable_struct_reference(var_name, btype, |
1214 | loc); | |
8381eda7 | 1215 | else |
1216 | { | |
1217 | Location bloc = Linemap::predeclared_location(); | |
1218 | bool is_hidden = ((no->is_function() | |
1219 | && no->func_value()->enclosing() != NULL) | |
1220 | || Gogo::is_thunk(no)); | |
1221 | bvar = context->backend()->immutable_struct(var_name, is_hidden, false, | |
1222 | btype, bloc); | |
1223 | Expression_list* vals = new Expression_list(); | |
f8bdf81a | 1224 | vals->push_back(Expression::make_func_code_reference(this->fn_, bloc)); |
8381eda7 | 1225 | Expression* init = |
1226 | Expression::make_struct_composite_literal(this->type(), vals, bloc); | |
1227 | Translate_context bcontext(gogo, NULL, NULL, NULL); | |
1228 | bcontext.set_is_const(); | |
ea664253 | 1229 | Bexpression* binit = init->get_backend(&bcontext); |
8381eda7 | 1230 | context->backend()->immutable_struct_set_init(bvar, var_name, is_hidden, |
1231 | false, btype, bloc, binit); | |
1232 | } | |
1233 | ||
1234 | this->dvar_ = bvar; | |
ea664253 | 1235 | return gogo->backend()->var_expression(bvar, loc); |
8381eda7 | 1236 | } |
1237 | ||
c6837989 | 1238 | // Print a function descriptor expression. |
1239 | ||
1240 | void | |
1241 | Func_descriptor_expression::do_dump_expression(Ast_dump_context* context) const | |
1242 | { | |
1243 | context->ostream() << "[descriptor " << this->fn_->name() << "]"; | |
1244 | } | |
1245 | ||
8381eda7 | 1246 | // Make a function descriptor expression. |
1247 | ||
c6837989 | 1248 | Func_descriptor_expression* |
1249 | Expression::make_func_descriptor(Named_object* fn) | |
8381eda7 | 1250 | { |
c6837989 | 1251 | return new Func_descriptor_expression(fn); |
8381eda7 | 1252 | } |
1253 | ||
1254 | // Make the function descriptor type, so that it can be converted. | |
1255 | ||
1256 | void | |
1257 | Expression::make_func_descriptor_type() | |
1258 | { | |
1259 | Func_descriptor_expression::make_func_descriptor_type(); | |
1260 | } | |
1261 | ||
1262 | // A reference to just the code of a function. | |
1263 | ||
1264 | class Func_code_reference_expression : public Expression | |
1265 | { | |
1266 | public: | |
1267 | Func_code_reference_expression(Named_object* function, Location location) | |
1268 | : Expression(EXPRESSION_FUNC_CODE_REFERENCE, location), | |
1269 | function_(function) | |
1270 | { } | |
1271 | ||
1272 | protected: | |
1273 | int | |
1274 | do_traverse(Traverse*) | |
1275 | { return TRAVERSE_CONTINUE; } | |
1276 | ||
f9ca30f9 | 1277 | bool |
1278 | do_is_immutable() const | |
1279 | { return true; } | |
1280 | ||
8381eda7 | 1281 | Type* |
1282 | do_type() | |
1283 | { return Type::make_pointer_type(Type::make_void_type()); } | |
1284 | ||
1285 | void | |
1286 | do_determine_type(const Type_context*) | |
1287 | { } | |
1288 | ||
1289 | Expression* | |
1290 | do_copy() | |
1291 | { | |
1292 | return Expression::make_func_code_reference(this->function_, | |
1293 | this->location()); | |
1294 | } | |
1295 | ||
ea664253 | 1296 | Bexpression* |
1297 | do_get_backend(Translate_context*); | |
8381eda7 | 1298 | |
1299 | void | |
1300 | do_dump_expression(Ast_dump_context* context) const | |
1301 | { context->ostream() << "[raw " << this->function_->name() << "]" ; } | |
1302 | ||
1303 | private: | |
1304 | // The function. | |
1305 | Named_object* function_; | |
1306 | }; | |
1307 | ||
ea664253 | 1308 | // Get the backend representation for a reference to function code. |
8381eda7 | 1309 | |
ea664253 | 1310 | Bexpression* |
1311 | Func_code_reference_expression::do_get_backend(Translate_context* context) | |
8381eda7 | 1312 | { |
ea664253 | 1313 | return Func_expression::get_code_pointer(context->gogo(), this->function_, |
1314 | this->location()); | |
8381eda7 | 1315 | } |
1316 | ||
1317 | // Make a reference to the code of a function. | |
1318 | ||
1319 | Expression* | |
1320 | Expression::make_func_code_reference(Named_object* function, Location location) | |
1321 | { | |
1322 | return new Func_code_reference_expression(function, location); | |
1323 | } | |
1324 | ||
e440a328 | 1325 | // Class Unknown_expression. |
1326 | ||
1327 | // Return the name of an unknown expression. | |
1328 | ||
1329 | const std::string& | |
1330 | Unknown_expression::name() const | |
1331 | { | |
1332 | return this->named_object_->name(); | |
1333 | } | |
1334 | ||
1335 | // Lower a reference to an unknown name. | |
1336 | ||
1337 | Expression* | |
ceeb4318 | 1338 | Unknown_expression::do_lower(Gogo*, Named_object*, Statement_inserter*, int) |
e440a328 | 1339 | { |
b13c66cd | 1340 | Location location = this->location(); |
e440a328 | 1341 | Named_object* no = this->named_object_; |
deded542 | 1342 | Named_object* real; |
1343 | if (!no->is_unknown()) | |
1344 | real = no; | |
1345 | else | |
e440a328 | 1346 | { |
deded542 | 1347 | real = no->unknown_value()->real_named_object(); |
1348 | if (real == NULL) | |
1349 | { | |
1350 | if (this->is_composite_literal_key_) | |
1351 | return this; | |
acf8e158 | 1352 | if (!this->no_error_message_) |
1353 | error_at(location, "reference to undefined name %qs", | |
1354 | this->named_object_->message_name().c_str()); | |
deded542 | 1355 | return Expression::make_error(location); |
1356 | } | |
e440a328 | 1357 | } |
1358 | switch (real->classification()) | |
1359 | { | |
1360 | case Named_object::NAMED_OBJECT_CONST: | |
1361 | return Expression::make_const_reference(real, location); | |
1362 | case Named_object::NAMED_OBJECT_TYPE: | |
1363 | return Expression::make_type(real->type_value(), location); | |
1364 | case Named_object::NAMED_OBJECT_TYPE_DECLARATION: | |
1365 | if (this->is_composite_literal_key_) | |
1366 | return this; | |
acf8e158 | 1367 | if (!this->no_error_message_) |
1368 | error_at(location, "reference to undefined type %qs", | |
1369 | real->message_name().c_str()); | |
e440a328 | 1370 | return Expression::make_error(location); |
1371 | case Named_object::NAMED_OBJECT_VAR: | |
7d834090 | 1372 | real->var_value()->set_is_used(); |
e440a328 | 1373 | return Expression::make_var_reference(real, location); |
1374 | case Named_object::NAMED_OBJECT_FUNC: | |
1375 | case Named_object::NAMED_OBJECT_FUNC_DECLARATION: | |
1376 | return Expression::make_func_reference(real, NULL, location); | |
1377 | case Named_object::NAMED_OBJECT_PACKAGE: | |
1378 | if (this->is_composite_literal_key_) | |
1379 | return this; | |
acf8e158 | 1380 | if (!this->no_error_message_) |
1381 | error_at(location, "unexpected reference to package"); | |
e440a328 | 1382 | return Expression::make_error(location); |
1383 | default: | |
c3e6f413 | 1384 | go_unreachable(); |
e440a328 | 1385 | } |
1386 | } | |
1387 | ||
d751bb78 | 1388 | // Dump the ast representation for an unknown expression to a dump context. |
1389 | ||
1390 | void | |
1391 | Unknown_expression::do_dump_expression(Ast_dump_context* ast_dump_context) const | |
1392 | { | |
1393 | ast_dump_context->ostream() << "_Unknown_(" << this->named_object_->name() | |
1394 | << ")"; | |
d751bb78 | 1395 | } |
1396 | ||
e440a328 | 1397 | // Make a reference to an unknown name. |
1398 | ||
acf8e158 | 1399 | Unknown_expression* |
b13c66cd | 1400 | Expression::make_unknown_reference(Named_object* no, Location location) |
e440a328 | 1401 | { |
e440a328 | 1402 | return new Unknown_expression(no, location); |
1403 | } | |
1404 | ||
1405 | // A boolean expression. | |
1406 | ||
1407 | class Boolean_expression : public Expression | |
1408 | { | |
1409 | public: | |
b13c66cd | 1410 | Boolean_expression(bool val, Location location) |
e440a328 | 1411 | : Expression(EXPRESSION_BOOLEAN, location), |
1412 | val_(val), type_(NULL) | |
1413 | { } | |
1414 | ||
1415 | static Expression* | |
1416 | do_import(Import*); | |
1417 | ||
1418 | protected: | |
1419 | bool | |
1420 | do_is_constant() const | |
1421 | { return true; } | |
1422 | ||
0e168074 | 1423 | bool |
1424 | do_is_immutable() const | |
1425 | { return true; } | |
1426 | ||
e440a328 | 1427 | Type* |
1428 | do_type(); | |
1429 | ||
1430 | void | |
1431 | do_determine_type(const Type_context*); | |
1432 | ||
1433 | Expression* | |
1434 | do_copy() | |
1435 | { return this; } | |
1436 | ||
ea664253 | 1437 | Bexpression* |
1438 | do_get_backend(Translate_context* context) | |
1439 | { return context->backend()->boolean_constant_expression(this->val_); } | |
e440a328 | 1440 | |
1441 | void | |
1442 | do_export(Export* exp) const | |
1443 | { exp->write_c_string(this->val_ ? "true" : "false"); } | |
1444 | ||
d751bb78 | 1445 | void |
1446 | do_dump_expression(Ast_dump_context* ast_dump_context) const | |
1447 | { ast_dump_context->ostream() << (this->val_ ? "true" : "false"); } | |
1448 | ||
e440a328 | 1449 | private: |
1450 | // The constant. | |
1451 | bool val_; | |
1452 | // The type as determined by context. | |
1453 | Type* type_; | |
1454 | }; | |
1455 | ||
1456 | // Get the type. | |
1457 | ||
1458 | Type* | |
1459 | Boolean_expression::do_type() | |
1460 | { | |
1461 | if (this->type_ == NULL) | |
1462 | this->type_ = Type::make_boolean_type(); | |
1463 | return this->type_; | |
1464 | } | |
1465 | ||
1466 | // Set the type from the context. | |
1467 | ||
1468 | void | |
1469 | Boolean_expression::do_determine_type(const Type_context* context) | |
1470 | { | |
1471 | if (this->type_ != NULL && !this->type_->is_abstract()) | |
1472 | ; | |
1473 | else if (context->type != NULL && context->type->is_boolean_type()) | |
1474 | this->type_ = context->type; | |
1475 | else if (!context->may_be_abstract) | |
1476 | this->type_ = Type::lookup_bool_type(); | |
1477 | } | |
1478 | ||
1479 | // Import a boolean constant. | |
1480 | ||
1481 | Expression* | |
1482 | Boolean_expression::do_import(Import* imp) | |
1483 | { | |
1484 | if (imp->peek_char() == 't') | |
1485 | { | |
1486 | imp->require_c_string("true"); | |
1487 | return Expression::make_boolean(true, imp->location()); | |
1488 | } | |
1489 | else | |
1490 | { | |
1491 | imp->require_c_string("false"); | |
1492 | return Expression::make_boolean(false, imp->location()); | |
1493 | } | |
1494 | } | |
1495 | ||
1496 | // Make a boolean expression. | |
1497 | ||
1498 | Expression* | |
b13c66cd | 1499 | Expression::make_boolean(bool val, Location location) |
e440a328 | 1500 | { |
1501 | return new Boolean_expression(val, location); | |
1502 | } | |
1503 | ||
1504 | // Class String_expression. | |
1505 | ||
1506 | // Get the type. | |
1507 | ||
1508 | Type* | |
1509 | String_expression::do_type() | |
1510 | { | |
1511 | if (this->type_ == NULL) | |
1512 | this->type_ = Type::make_string_type(); | |
1513 | return this->type_; | |
1514 | } | |
1515 | ||
1516 | // Set the type from the context. | |
1517 | ||
1518 | void | |
1519 | String_expression::do_determine_type(const Type_context* context) | |
1520 | { | |
1521 | if (this->type_ != NULL && !this->type_->is_abstract()) | |
1522 | ; | |
1523 | else if (context->type != NULL && context->type->is_string_type()) | |
1524 | this->type_ = context->type; | |
1525 | else if (!context->may_be_abstract) | |
1526 | this->type_ = Type::lookup_string_type(); | |
1527 | } | |
1528 | ||
1529 | // Build a string constant. | |
1530 | ||
ea664253 | 1531 | Bexpression* |
1532 | String_expression::do_get_backend(Translate_context* context) | |
e440a328 | 1533 | { |
2c809f8f | 1534 | Gogo* gogo = context->gogo(); |
1535 | Btype* btype = Type::make_string_type()->get_backend(gogo); | |
1536 | ||
1537 | Location loc = this->location(); | |
1538 | std::vector<Bexpression*> init(2); | |
1539 | Bexpression* str_cst = | |
1540 | gogo->backend()->string_constant_expression(this->val_); | |
1541 | init[0] = gogo->backend()->address_expression(str_cst, loc); | |
1542 | ||
1543 | Btype* int_btype = Type::lookup_integer_type("int")->get_backend(gogo); | |
1544 | mpz_t lenval; | |
1545 | mpz_init_set_ui(lenval, this->val_.length()); | |
1546 | init[1] = gogo->backend()->integer_constant_expression(int_btype, lenval); | |
1547 | mpz_clear(lenval); | |
1548 | ||
ea664253 | 1549 | return gogo->backend()->constructor_expression(btype, init, loc); |
e440a328 | 1550 | } |
1551 | ||
8b1c301d | 1552 | // Write string literal to string dump. |
e440a328 | 1553 | |
1554 | void | |
8b1c301d | 1555 | String_expression::export_string(String_dump* exp, |
1556 | const String_expression* str) | |
e440a328 | 1557 | { |
1558 | std::string s; | |
8b1c301d | 1559 | s.reserve(str->val_.length() * 4 + 2); |
e440a328 | 1560 | s += '"'; |
8b1c301d | 1561 | for (std::string::const_iterator p = str->val_.begin(); |
1562 | p != str->val_.end(); | |
e440a328 | 1563 | ++p) |
1564 | { | |
1565 | if (*p == '\\' || *p == '"') | |
1566 | { | |
1567 | s += '\\'; | |
1568 | s += *p; | |
1569 | } | |
1570 | else if (*p >= 0x20 && *p < 0x7f) | |
1571 | s += *p; | |
1572 | else if (*p == '\n') | |
1573 | s += "\\n"; | |
1574 | else if (*p == '\t') | |
1575 | s += "\\t"; | |
1576 | else | |
1577 | { | |
1578 | s += "\\x"; | |
1579 | unsigned char c = *p; | |
1580 | unsigned int dig = c >> 4; | |
1581 | s += dig < 10 ? '0' + dig : 'A' + dig - 10; | |
1582 | dig = c & 0xf; | |
1583 | s += dig < 10 ? '0' + dig : 'A' + dig - 10; | |
1584 | } | |
1585 | } | |
1586 | s += '"'; | |
1587 | exp->write_string(s); | |
1588 | } | |
1589 | ||
8b1c301d | 1590 | // Export a string expression. |
1591 | ||
1592 | void | |
1593 | String_expression::do_export(Export* exp) const | |
1594 | { | |
1595 | String_expression::export_string(exp, this); | |
1596 | } | |
1597 | ||
e440a328 | 1598 | // Import a string expression. |
1599 | ||
1600 | Expression* | |
1601 | String_expression::do_import(Import* imp) | |
1602 | { | |
1603 | imp->require_c_string("\""); | |
1604 | std::string val; | |
1605 | while (true) | |
1606 | { | |
1607 | int c = imp->get_char(); | |
1608 | if (c == '"' || c == -1) | |
1609 | break; | |
1610 | if (c != '\\') | |
1611 | val += static_cast<char>(c); | |
1612 | else | |
1613 | { | |
1614 | c = imp->get_char(); | |
1615 | if (c == '\\' || c == '"') | |
1616 | val += static_cast<char>(c); | |
1617 | else if (c == 'n') | |
1618 | val += '\n'; | |
1619 | else if (c == 't') | |
1620 | val += '\t'; | |
1621 | else if (c == 'x') | |
1622 | { | |
1623 | c = imp->get_char(); | |
1624 | unsigned int vh = c >= '0' && c <= '9' ? c - '0' : c - 'A' + 10; | |
1625 | c = imp->get_char(); | |
1626 | unsigned int vl = c >= '0' && c <= '9' ? c - '0' : c - 'A' + 10; | |
1627 | char v = (vh << 4) | vl; | |
1628 | val += v; | |
1629 | } | |
1630 | else | |
1631 | { | |
1632 | error_at(imp->location(), "bad string constant"); | |
1633 | return Expression::make_error(imp->location()); | |
1634 | } | |
1635 | } | |
1636 | } | |
1637 | return Expression::make_string(val, imp->location()); | |
1638 | } | |
1639 | ||
d751bb78 | 1640 | // Ast dump for string expression. |
1641 | ||
1642 | void | |
1643 | String_expression::do_dump_expression(Ast_dump_context* ast_dump_context) const | |
1644 | { | |
8b1c301d | 1645 | String_expression::export_string(ast_dump_context, this); |
d751bb78 | 1646 | } |
1647 | ||
e440a328 | 1648 | // Make a string expression. |
1649 | ||
1650 | Expression* | |
b13c66cd | 1651 | Expression::make_string(const std::string& val, Location location) |
e440a328 | 1652 | { |
1653 | return new String_expression(val, location); | |
1654 | } | |
1655 | ||
2c809f8f | 1656 | // An expression that evaluates to some characteristic of a string. |
1657 | // This is used when indexing, bound-checking, or nil checking a string. | |
1658 | ||
1659 | class String_info_expression : public Expression | |
1660 | { | |
1661 | public: | |
1662 | String_info_expression(Expression* string, String_info string_info, | |
1663 | Location location) | |
1664 | : Expression(EXPRESSION_STRING_INFO, location), | |
1665 | string_(string), string_info_(string_info) | |
1666 | { } | |
1667 | ||
1668 | protected: | |
1669 | Type* | |
1670 | do_type(); | |
1671 | ||
1672 | void | |
1673 | do_determine_type(const Type_context*) | |
1674 | { go_unreachable(); } | |
1675 | ||
1676 | Expression* | |
1677 | do_copy() | |
1678 | { | |
1679 | return new String_info_expression(this->string_->copy(), this->string_info_, | |
1680 | this->location()); | |
1681 | } | |
1682 | ||
ea664253 | 1683 | Bexpression* |
1684 | do_get_backend(Translate_context* context); | |
2c809f8f | 1685 | |
1686 | void | |
1687 | do_dump_expression(Ast_dump_context*) const; | |
1688 | ||
1689 | void | |
1690 | do_issue_nil_check() | |
1691 | { this->string_->issue_nil_check(); } | |
1692 | ||
1693 | private: | |
1694 | // The string for which we are getting information. | |
1695 | Expression* string_; | |
1696 | // What information we want. | |
1697 | String_info string_info_; | |
1698 | }; | |
1699 | ||
1700 | // Return the type of the string info. | |
1701 | ||
1702 | Type* | |
1703 | String_info_expression::do_type() | |
1704 | { | |
1705 | switch (this->string_info_) | |
1706 | { | |
1707 | case STRING_INFO_DATA: | |
1708 | { | |
1709 | Type* byte_type = Type::lookup_integer_type("uint8"); | |
1710 | return Type::make_pointer_type(byte_type); | |
1711 | } | |
1712 | case STRING_INFO_LENGTH: | |
1713 | return Type::lookup_integer_type("int"); | |
1714 | default: | |
1715 | go_unreachable(); | |
1716 | } | |
1717 | } | |
1718 | ||
1719 | // Return string information in GENERIC. | |
1720 | ||
ea664253 | 1721 | Bexpression* |
1722 | String_info_expression::do_get_backend(Translate_context* context) | |
2c809f8f | 1723 | { |
1724 | Gogo* gogo = context->gogo(); | |
1725 | ||
ea664253 | 1726 | Bexpression* bstring = this->string_->get_backend(context); |
2c809f8f | 1727 | switch (this->string_info_) |
1728 | { | |
1729 | case STRING_INFO_DATA: | |
1730 | case STRING_INFO_LENGTH: | |
ea664253 | 1731 | return gogo->backend()->struct_field_expression(bstring, |
1732 | this->string_info_, | |
1733 | this->location()); | |
2c809f8f | 1734 | break; |
1735 | default: | |
1736 | go_unreachable(); | |
1737 | } | |
2c809f8f | 1738 | } |
1739 | ||
1740 | // Dump ast representation for a type info expression. | |
1741 | ||
1742 | void | |
1743 | String_info_expression::do_dump_expression( | |
1744 | Ast_dump_context* ast_dump_context) const | |
1745 | { | |
1746 | ast_dump_context->ostream() << "stringinfo("; | |
1747 | this->string_->dump_expression(ast_dump_context); | |
1748 | ast_dump_context->ostream() << ","; | |
1749 | ast_dump_context->ostream() << | |
1750 | (this->string_info_ == STRING_INFO_DATA ? "data" | |
1751 | : this->string_info_ == STRING_INFO_LENGTH ? "length" | |
1752 | : "unknown"); | |
1753 | ast_dump_context->ostream() << ")"; | |
1754 | } | |
1755 | ||
1756 | // Make a string info expression. | |
1757 | ||
1758 | Expression* | |
1759 | Expression::make_string_info(Expression* string, String_info string_info, | |
1760 | Location location) | |
1761 | { | |
1762 | return new String_info_expression(string, string_info, location); | |
1763 | } | |
1764 | ||
e440a328 | 1765 | // Make an integer expression. |
1766 | ||
1767 | class Integer_expression : public Expression | |
1768 | { | |
1769 | public: | |
5d4b8566 | 1770 | Integer_expression(const mpz_t* val, Type* type, bool is_character_constant, |
1771 | Location location) | |
e440a328 | 1772 | : Expression(EXPRESSION_INTEGER, location), |
5d4b8566 | 1773 | type_(type), is_character_constant_(is_character_constant) |
e440a328 | 1774 | { mpz_init_set(this->val_, *val); } |
1775 | ||
1776 | static Expression* | |
1777 | do_import(Import*); | |
1778 | ||
8b1c301d | 1779 | // Write VAL to string dump. |
e440a328 | 1780 | static void |
8b1c301d | 1781 | export_integer(String_dump* exp, const mpz_t val); |
e440a328 | 1782 | |
d751bb78 | 1783 | // Write VAL to dump context. |
1784 | static void | |
1785 | dump_integer(Ast_dump_context* ast_dump_context, const mpz_t val); | |
1786 | ||
e440a328 | 1787 | protected: |
1788 | bool | |
1789 | do_is_constant() const | |
1790 | { return true; } | |
1791 | ||
0e168074 | 1792 | bool |
1793 | do_is_immutable() const | |
1794 | { return true; } | |
1795 | ||
e440a328 | 1796 | bool |
0c77715b | 1797 | do_numeric_constant_value(Numeric_constant* nc) const; |
e440a328 | 1798 | |
1799 | Type* | |
1800 | do_type(); | |
1801 | ||
1802 | void | |
1803 | do_determine_type(const Type_context* context); | |
1804 | ||
1805 | void | |
1806 | do_check_types(Gogo*); | |
1807 | ||
ea664253 | 1808 | Bexpression* |
1809 | do_get_backend(Translate_context*); | |
e440a328 | 1810 | |
1811 | Expression* | |
1812 | do_copy() | |
5d4b8566 | 1813 | { |
1814 | if (this->is_character_constant_) | |
1815 | return Expression::make_character(&this->val_, this->type_, | |
1816 | this->location()); | |
1817 | else | |
e67508fa | 1818 | return Expression::make_integer_z(&this->val_, this->type_, |
1819 | this->location()); | |
5d4b8566 | 1820 | } |
e440a328 | 1821 | |
1822 | void | |
1823 | do_export(Export*) const; | |
1824 | ||
d751bb78 | 1825 | void |
1826 | do_dump_expression(Ast_dump_context*) const; | |
1827 | ||
e440a328 | 1828 | private: |
1829 | // The integer value. | |
1830 | mpz_t val_; | |
1831 | // The type so far. | |
1832 | Type* type_; | |
5d4b8566 | 1833 | // Whether this is a character constant. |
1834 | bool is_character_constant_; | |
e440a328 | 1835 | }; |
1836 | ||
0c77715b | 1837 | // Return a numeric constant for this expression. We have to mark |
1838 | // this as a character when appropriate. | |
e440a328 | 1839 | |
1840 | bool | |
0c77715b | 1841 | Integer_expression::do_numeric_constant_value(Numeric_constant* nc) const |
e440a328 | 1842 | { |
0c77715b | 1843 | if (this->is_character_constant_) |
1844 | nc->set_rune(this->type_, this->val_); | |
1845 | else | |
1846 | nc->set_int(this->type_, this->val_); | |
e440a328 | 1847 | return true; |
1848 | } | |
1849 | ||
1850 | // Return the current type. If we haven't set the type yet, we return | |
1851 | // an abstract integer type. | |
1852 | ||
1853 | Type* | |
1854 | Integer_expression::do_type() | |
1855 | { | |
1856 | if (this->type_ == NULL) | |
5d4b8566 | 1857 | { |
1858 | if (this->is_character_constant_) | |
1859 | this->type_ = Type::make_abstract_character_type(); | |
1860 | else | |
1861 | this->type_ = Type::make_abstract_integer_type(); | |
1862 | } | |
e440a328 | 1863 | return this->type_; |
1864 | } | |
1865 | ||
1866 | // Set the type of the integer value. Here we may switch from an | |
1867 | // abstract type to a real type. | |
1868 | ||
1869 | void | |
1870 | Integer_expression::do_determine_type(const Type_context* context) | |
1871 | { | |
1872 | if (this->type_ != NULL && !this->type_->is_abstract()) | |
1873 | ; | |
0c77715b | 1874 | else if (context->type != NULL && context->type->is_numeric_type()) |
e440a328 | 1875 | this->type_ = context->type; |
1876 | else if (!context->may_be_abstract) | |
5d4b8566 | 1877 | { |
1878 | if (this->is_character_constant_) | |
1879 | this->type_ = Type::lookup_integer_type("int32"); | |
1880 | else | |
1881 | this->type_ = Type::lookup_integer_type("int"); | |
1882 | } | |
e440a328 | 1883 | } |
1884 | ||
e440a328 | 1885 | // Check the type of an integer constant. |
1886 | ||
1887 | void | |
1888 | Integer_expression::do_check_types(Gogo*) | |
1889 | { | |
0c77715b | 1890 | Type* type = this->type_; |
1891 | if (type == NULL) | |
e440a328 | 1892 | return; |
0c77715b | 1893 | Numeric_constant nc; |
1894 | if (this->is_character_constant_) | |
1895 | nc.set_rune(NULL, this->val_); | |
1896 | else | |
1897 | nc.set_int(NULL, this->val_); | |
1898 | if (!nc.set_type(type, true, this->location())) | |
e440a328 | 1899 | this->set_is_error(); |
1900 | } | |
1901 | ||
ea664253 | 1902 | // Get the backend representation for an integer constant. |
e440a328 | 1903 | |
ea664253 | 1904 | Bexpression* |
1905 | Integer_expression::do_get_backend(Translate_context* context) | |
e440a328 | 1906 | { |
48c2a53a | 1907 | Type* resolved_type = NULL; |
e440a328 | 1908 | if (this->type_ != NULL && !this->type_->is_abstract()) |
48c2a53a | 1909 | resolved_type = this->type_; |
e440a328 | 1910 | else if (this->type_ != NULL && this->type_->float_type() != NULL) |
1911 | { | |
1912 | // We are converting to an abstract floating point type. | |
48c2a53a | 1913 | resolved_type = Type::lookup_float_type("float64"); |
e440a328 | 1914 | } |
1915 | else if (this->type_ != NULL && this->type_->complex_type() != NULL) | |
1916 | { | |
1917 | // We are converting to an abstract complex type. | |
48c2a53a | 1918 | resolved_type = Type::lookup_complex_type("complex128"); |
e440a328 | 1919 | } |
1920 | else | |
1921 | { | |
1922 | // If we still have an abstract type here, then this is being | |
1923 | // used in a constant expression which didn't get reduced for | |
1924 | // some reason. Use a type which will fit the value. We use <, | |
1925 | // not <=, because we need an extra bit for the sign bit. | |
1926 | int bits = mpz_sizeinbase(this->val_, 2); | |
1b1f2abf | 1927 | Type* int_type = Type::lookup_integer_type("int"); |
1928 | if (bits < int_type->integer_type()->bits()) | |
48c2a53a | 1929 | resolved_type = int_type; |
e440a328 | 1930 | else if (bits < 64) |
48c2a53a | 1931 | resolved_type = Type::lookup_integer_type("int64"); |
e440a328 | 1932 | else |
48c2a53a | 1933 | { |
1934 | if (!saw_errors()) | |
1935 | error_at(this->location(), | |
1936 | "unknown type for large integer constant"); | |
ea664253 | 1937 | return context->gogo()->backend()->error_expression(); |
48c2a53a | 1938 | } |
e440a328 | 1939 | } |
48c2a53a | 1940 | Numeric_constant nc; |
1941 | nc.set_int(resolved_type, this->val_); | |
ea664253 | 1942 | return Expression::backend_numeric_constant_expression(context, &nc); |
e440a328 | 1943 | } |
1944 | ||
1945 | // Write VAL to export data. | |
1946 | ||
1947 | void | |
8b1c301d | 1948 | Integer_expression::export_integer(String_dump* exp, const mpz_t val) |
e440a328 | 1949 | { |
1950 | char* s = mpz_get_str(NULL, 10, val); | |
1951 | exp->write_c_string(s); | |
1952 | free(s); | |
1953 | } | |
1954 | ||
1955 | // Export an integer in a constant expression. | |
1956 | ||
1957 | void | |
1958 | Integer_expression::do_export(Export* exp) const | |
1959 | { | |
1960 | Integer_expression::export_integer(exp, this->val_); | |
5d4b8566 | 1961 | if (this->is_character_constant_) |
1962 | exp->write_c_string("'"); | |
e440a328 | 1963 | // A trailing space lets us reliably identify the end of the number. |
1964 | exp->write_c_string(" "); | |
1965 | } | |
1966 | ||
1967 | // Import an integer, floating point, or complex value. This handles | |
1968 | // all these types because they all start with digits. | |
1969 | ||
1970 | Expression* | |
1971 | Integer_expression::do_import(Import* imp) | |
1972 | { | |
1973 | std::string num = imp->read_identifier(); | |
1974 | imp->require_c_string(" "); | |
1975 | if (!num.empty() && num[num.length() - 1] == 'i') | |
1976 | { | |
1977 | mpfr_t real; | |
1978 | size_t plus_pos = num.find('+', 1); | |
1979 | size_t minus_pos = num.find('-', 1); | |
1980 | size_t pos; | |
1981 | if (plus_pos == std::string::npos) | |
1982 | pos = minus_pos; | |
1983 | else if (minus_pos == std::string::npos) | |
1984 | pos = plus_pos; | |
1985 | else | |
1986 | { | |
1987 | error_at(imp->location(), "bad number in import data: %qs", | |
1988 | num.c_str()); | |
1989 | return Expression::make_error(imp->location()); | |
1990 | } | |
1991 | if (pos == std::string::npos) | |
1992 | mpfr_set_ui(real, 0, GMP_RNDN); | |
1993 | else | |
1994 | { | |
1995 | std::string real_str = num.substr(0, pos); | |
1996 | if (mpfr_init_set_str(real, real_str.c_str(), 10, GMP_RNDN) != 0) | |
1997 | { | |
1998 | error_at(imp->location(), "bad number in import data: %qs", | |
1999 | real_str.c_str()); | |
2000 | return Expression::make_error(imp->location()); | |
2001 | } | |
2002 | } | |
2003 | ||
2004 | std::string imag_str; | |
2005 | if (pos == std::string::npos) | |
2006 | imag_str = num; | |
2007 | else | |
2008 | imag_str = num.substr(pos); | |
2009 | imag_str = imag_str.substr(0, imag_str.size() - 1); | |
2010 | mpfr_t imag; | |
2011 | if (mpfr_init_set_str(imag, imag_str.c_str(), 10, GMP_RNDN) != 0) | |
2012 | { | |
2013 | error_at(imp->location(), "bad number in import data: %qs", | |
2014 | imag_str.c_str()); | |
2015 | return Expression::make_error(imp->location()); | |
2016 | } | |
fcbea5e4 | 2017 | mpc_t cval; |
2018 | mpc_init2(cval, mpc_precision); | |
2019 | mpc_set_fr_fr(cval, real, imag, MPC_RNDNN); | |
e440a328 | 2020 | mpfr_clear(real); |
2021 | mpfr_clear(imag); | |
fcbea5e4 | 2022 | Expression* ret = Expression::make_complex(&cval, NULL, imp->location()); |
2023 | mpc_clear(cval); | |
e440a328 | 2024 | return ret; |
2025 | } | |
2026 | else if (num.find('.') == std::string::npos | |
2027 | && num.find('E') == std::string::npos) | |
2028 | { | |
5d4b8566 | 2029 | bool is_character_constant = (!num.empty() |
2030 | && num[num.length() - 1] == '\''); | |
2031 | if (is_character_constant) | |
2032 | num = num.substr(0, num.length() - 1); | |
e440a328 | 2033 | mpz_t val; |
2034 | if (mpz_init_set_str(val, num.c_str(), 10) != 0) | |
2035 | { | |
2036 | error_at(imp->location(), "bad number in import data: %qs", | |
2037 | num.c_str()); | |
2038 | return Expression::make_error(imp->location()); | |
2039 | } | |
5d4b8566 | 2040 | Expression* ret; |
2041 | if (is_character_constant) | |
2042 | ret = Expression::make_character(&val, NULL, imp->location()); | |
2043 | else | |
e67508fa | 2044 | ret = Expression::make_integer_z(&val, NULL, imp->location()); |
e440a328 | 2045 | mpz_clear(val); |
2046 | return ret; | |
2047 | } | |
2048 | else | |
2049 | { | |
2050 | mpfr_t val; | |
2051 | if (mpfr_init_set_str(val, num.c_str(), 10, GMP_RNDN) != 0) | |
2052 | { | |
2053 | error_at(imp->location(), "bad number in import data: %qs", | |
2054 | num.c_str()); | |
2055 | return Expression::make_error(imp->location()); | |
2056 | } | |
2057 | Expression* ret = Expression::make_float(&val, NULL, imp->location()); | |
2058 | mpfr_clear(val); | |
2059 | return ret; | |
2060 | } | |
2061 | } | |
d751bb78 | 2062 | // Ast dump for integer expression. |
2063 | ||
2064 | void | |
2065 | Integer_expression::do_dump_expression(Ast_dump_context* ast_dump_context) const | |
2066 | { | |
5d4b8566 | 2067 | if (this->is_character_constant_) |
2068 | ast_dump_context->ostream() << '\''; | |
8b1c301d | 2069 | Integer_expression::export_integer(ast_dump_context, this->val_); |
5d4b8566 | 2070 | if (this->is_character_constant_) |
2071 | ast_dump_context->ostream() << '\''; | |
d751bb78 | 2072 | } |
2073 | ||
e67508fa | 2074 | // Build a new integer value from a multi-precision integer. |
e440a328 | 2075 | |
2076 | Expression* | |
e67508fa | 2077 | Expression::make_integer_z(const mpz_t* val, Type* type, Location location) |
5d4b8566 | 2078 | { |
2079 | return new Integer_expression(val, type, false, location); | |
2080 | } | |
2081 | ||
e67508fa | 2082 | // Build a new integer value from an unsigned long. |
2083 | ||
2084 | Expression* | |
2085 | Expression::make_integer_ul(unsigned long val, Type *type, Location location) | |
2086 | { | |
2087 | mpz_t zval; | |
2088 | mpz_init_set_ui(zval, val); | |
2089 | Expression* ret = Expression::make_integer_z(&zval, type, location); | |
2090 | mpz_clear(zval); | |
2091 | return ret; | |
2092 | } | |
2093 | ||
2094 | // Build a new integer value from a signed long. | |
2095 | ||
2096 | Expression* | |
2097 | Expression::make_integer_sl(long val, Type *type, Location location) | |
2098 | { | |
2099 | mpz_t zval; | |
2100 | mpz_init_set_si(zval, val); | |
2101 | Expression* ret = Expression::make_integer_z(&zval, type, location); | |
2102 | mpz_clear(zval); | |
2103 | return ret; | |
2104 | } | |
2105 | ||
3f378015 | 2106 | // Store an int64_t in an uninitialized mpz_t. |
2107 | ||
2108 | static void | |
2109 | set_mpz_from_int64(mpz_t* zval, int64_t val) | |
2110 | { | |
2111 | if (val >= 0) | |
2112 | { | |
2113 | unsigned long ul = static_cast<unsigned long>(val); | |
2114 | if (static_cast<int64_t>(ul) == val) | |
2115 | { | |
2116 | mpz_init_set_ui(*zval, ul); | |
2117 | return; | |
2118 | } | |
2119 | } | |
2120 | uint64_t uv; | |
2121 | if (val >= 0) | |
2122 | uv = static_cast<uint64_t>(val); | |
2123 | else | |
2124 | uv = static_cast<uint64_t>(- val); | |
2125 | unsigned long ul = uv & 0xffffffffUL; | |
2126 | mpz_init_set_ui(*zval, ul); | |
2127 | mpz_t hval; | |
2128 | mpz_init_set_ui(hval, static_cast<unsigned long>(uv >> 32)); | |
2129 | mpz_mul_2exp(hval, hval, 32); | |
2130 | mpz_add(*zval, *zval, hval); | |
2131 | mpz_clear(hval); | |
2132 | if (val < 0) | |
2133 | mpz_neg(*zval, *zval); | |
2134 | } | |
2135 | ||
2136 | // Build a new integer value from an int64_t. | |
2137 | ||
2138 | Expression* | |
2139 | Expression::make_integer_int64(int64_t val, Type* type, Location location) | |
2140 | { | |
2141 | mpz_t zval; | |
2142 | set_mpz_from_int64(&zval, val); | |
2143 | Expression* ret = Expression::make_integer_z(&zval, type, location); | |
2144 | mpz_clear(zval); | |
2145 | return ret; | |
2146 | } | |
2147 | ||
5d4b8566 | 2148 | // Build a new character constant value. |
2149 | ||
2150 | Expression* | |
2151 | Expression::make_character(const mpz_t* val, Type* type, Location location) | |
e440a328 | 2152 | { |
5d4b8566 | 2153 | return new Integer_expression(val, type, true, location); |
e440a328 | 2154 | } |
2155 | ||
2156 | // Floats. | |
2157 | ||
2158 | class Float_expression : public Expression | |
2159 | { | |
2160 | public: | |
b13c66cd | 2161 | Float_expression(const mpfr_t* val, Type* type, Location location) |
e440a328 | 2162 | : Expression(EXPRESSION_FLOAT, location), |
2163 | type_(type) | |
2164 | { | |
2165 | mpfr_init_set(this->val_, *val, GMP_RNDN); | |
2166 | } | |
2167 | ||
e440a328 | 2168 | // Write VAL to export data. |
2169 | static void | |
8b1c301d | 2170 | export_float(String_dump* exp, const mpfr_t val); |
2171 | ||
d751bb78 | 2172 | // Write VAL to dump file. |
2173 | static void | |
2174 | dump_float(Ast_dump_context* ast_dump_context, const mpfr_t val); | |
e440a328 | 2175 | |
2176 | protected: | |
2177 | bool | |
2178 | do_is_constant() const | |
2179 | { return true; } | |
2180 | ||
0e168074 | 2181 | bool |
2182 | do_is_immutable() const | |
2183 | { return true; } | |
2184 | ||
e440a328 | 2185 | bool |
0c77715b | 2186 | do_numeric_constant_value(Numeric_constant* nc) const |
2187 | { | |
2188 | nc->set_float(this->type_, this->val_); | |
2189 | return true; | |
2190 | } | |
e440a328 | 2191 | |
2192 | Type* | |
2193 | do_type(); | |
2194 | ||
2195 | void | |
2196 | do_determine_type(const Type_context*); | |
2197 | ||
2198 | void | |
2199 | do_check_types(Gogo*); | |
2200 | ||
2201 | Expression* | |
2202 | do_copy() | |
2203 | { return Expression::make_float(&this->val_, this->type_, | |
2204 | this->location()); } | |
2205 | ||
ea664253 | 2206 | Bexpression* |
2207 | do_get_backend(Translate_context*); | |
e440a328 | 2208 | |
2209 | void | |
2210 | do_export(Export*) const; | |
2211 | ||
d751bb78 | 2212 | void |
2213 | do_dump_expression(Ast_dump_context*) const; | |
2214 | ||
e440a328 | 2215 | private: |
2216 | // The floating point value. | |
2217 | mpfr_t val_; | |
2218 | // The type so far. | |
2219 | Type* type_; | |
2220 | }; | |
2221 | ||
e440a328 | 2222 | // Return the current type. If we haven't set the type yet, we return |
2223 | // an abstract float type. | |
2224 | ||
2225 | Type* | |
2226 | Float_expression::do_type() | |
2227 | { | |
2228 | if (this->type_ == NULL) | |
2229 | this->type_ = Type::make_abstract_float_type(); | |
2230 | return this->type_; | |
2231 | } | |
2232 | ||
2233 | // Set the type of the float value. Here we may switch from an | |
2234 | // abstract type to a real type. | |
2235 | ||
2236 | void | |
2237 | Float_expression::do_determine_type(const Type_context* context) | |
2238 | { | |
2239 | if (this->type_ != NULL && !this->type_->is_abstract()) | |
2240 | ; | |
2241 | else if (context->type != NULL | |
2242 | && (context->type->integer_type() != NULL | |
2243 | || context->type->float_type() != NULL | |
2244 | || context->type->complex_type() != NULL)) | |
2245 | this->type_ = context->type; | |
2246 | else if (!context->may_be_abstract) | |
48080209 | 2247 | this->type_ = Type::lookup_float_type("float64"); |
e440a328 | 2248 | } |
2249 | ||
e440a328 | 2250 | // Check the type of a float value. |
2251 | ||
2252 | void | |
2253 | Float_expression::do_check_types(Gogo*) | |
2254 | { | |
0c77715b | 2255 | Type* type = this->type_; |
2256 | if (type == NULL) | |
e440a328 | 2257 | return; |
0c77715b | 2258 | Numeric_constant nc; |
2259 | nc.set_float(NULL, this->val_); | |
2260 | if (!nc.set_type(this->type_, true, this->location())) | |
e440a328 | 2261 | this->set_is_error(); |
e440a328 | 2262 | } |
2263 | ||
ea664253 | 2264 | // Get the backend representation for a float constant. |
e440a328 | 2265 | |
ea664253 | 2266 | Bexpression* |
2267 | Float_expression::do_get_backend(Translate_context* context) | |
e440a328 | 2268 | { |
48c2a53a | 2269 | Type* resolved_type; |
e440a328 | 2270 | if (this->type_ != NULL && !this->type_->is_abstract()) |
48c2a53a | 2271 | resolved_type = this->type_; |
e440a328 | 2272 | else if (this->type_ != NULL && this->type_->integer_type() != NULL) |
2273 | { | |
2274 | // We have an abstract integer type. We just hope for the best. | |
48c2a53a | 2275 | resolved_type = Type::lookup_integer_type("int"); |
2276 | } | |
2277 | else if (this->type_ != NULL && this->type_->complex_type() != NULL) | |
2278 | { | |
2279 | // We are converting to an abstract complex type. | |
2280 | resolved_type = Type::lookup_complex_type("complex128"); | |
e440a328 | 2281 | } |
2282 | else | |
2283 | { | |
2284 | // If we still have an abstract type here, then this is being | |
2285 | // used in a constant expression which didn't get reduced. We | |
2286 | // just use float64 and hope for the best. | |
48c2a53a | 2287 | resolved_type = Type::lookup_float_type("float64"); |
e440a328 | 2288 | } |
48c2a53a | 2289 | |
2290 | Numeric_constant nc; | |
2291 | nc.set_float(resolved_type, this->val_); | |
ea664253 | 2292 | return Expression::backend_numeric_constant_expression(context, &nc); |
e440a328 | 2293 | } |
2294 | ||
8b1c301d | 2295 | // Write a floating point number to a string dump. |
e440a328 | 2296 | |
2297 | void | |
8b1c301d | 2298 | Float_expression::export_float(String_dump *exp, const mpfr_t val) |
e440a328 | 2299 | { |
2300 | mp_exp_t exponent; | |
2301 | char* s = mpfr_get_str(NULL, &exponent, 10, 0, val, GMP_RNDN); | |
2302 | if (*s == '-') | |
2303 | exp->write_c_string("-"); | |
2304 | exp->write_c_string("0."); | |
2305 | exp->write_c_string(*s == '-' ? s + 1 : s); | |
2306 | mpfr_free_str(s); | |
2307 | char buf[30]; | |
2308 | snprintf(buf, sizeof buf, "E%ld", exponent); | |
2309 | exp->write_c_string(buf); | |
2310 | } | |
2311 | ||
2312 | // Export a floating point number in a constant expression. | |
2313 | ||
2314 | void | |
2315 | Float_expression::do_export(Export* exp) const | |
2316 | { | |
2317 | Float_expression::export_float(exp, this->val_); | |
2318 | // A trailing space lets us reliably identify the end of the number. | |
2319 | exp->write_c_string(" "); | |
2320 | } | |
2321 | ||
d751bb78 | 2322 | // Dump a floating point number to the dump file. |
2323 | ||
2324 | void | |
2325 | Float_expression::do_dump_expression(Ast_dump_context* ast_dump_context) const | |
2326 | { | |
8b1c301d | 2327 | Float_expression::export_float(ast_dump_context, this->val_); |
d751bb78 | 2328 | } |
2329 | ||
e440a328 | 2330 | // Make a float expression. |
2331 | ||
2332 | Expression* | |
b13c66cd | 2333 | Expression::make_float(const mpfr_t* val, Type* type, Location location) |
e440a328 | 2334 | { |
2335 | return new Float_expression(val, type, location); | |
2336 | } | |
2337 | ||
2338 | // Complex numbers. | |
2339 | ||
2340 | class Complex_expression : public Expression | |
2341 | { | |
2342 | public: | |
fcbea5e4 | 2343 | Complex_expression(const mpc_t* val, Type* type, Location location) |
e440a328 | 2344 | : Expression(EXPRESSION_COMPLEX, location), |
2345 | type_(type) | |
2346 | { | |
fcbea5e4 | 2347 | mpc_init2(this->val_, mpc_precision); |
2348 | mpc_set(this->val_, *val, MPC_RNDNN); | |
e440a328 | 2349 | } |
2350 | ||
fcbea5e4 | 2351 | // Write VAL to string dump. |
e440a328 | 2352 | static void |
fcbea5e4 | 2353 | export_complex(String_dump* exp, const mpc_t val); |
e440a328 | 2354 | |
d751bb78 | 2355 | // Write REAL/IMAG to dump context. |
2356 | static void | |
fcbea5e4 | 2357 | dump_complex(Ast_dump_context* ast_dump_context, const mpc_t val); |
d751bb78 | 2358 | |
e440a328 | 2359 | protected: |
2360 | bool | |
2361 | do_is_constant() const | |
2362 | { return true; } | |
2363 | ||
0e168074 | 2364 | bool |
2365 | do_is_immutable() const | |
2366 | { return true; } | |
2367 | ||
e440a328 | 2368 | bool |
0c77715b | 2369 | do_numeric_constant_value(Numeric_constant* nc) const |
2370 | { | |
fcbea5e4 | 2371 | nc->set_complex(this->type_, this->val_); |
0c77715b | 2372 | return true; |
2373 | } | |
e440a328 | 2374 | |
2375 | Type* | |
2376 | do_type(); | |
2377 | ||
2378 | void | |
2379 | do_determine_type(const Type_context*); | |
2380 | ||
2381 | void | |
2382 | do_check_types(Gogo*); | |
2383 | ||
2384 | Expression* | |
2385 | do_copy() | |
2386 | { | |
fcbea5e4 | 2387 | return Expression::make_complex(&this->val_, this->type_, |
e440a328 | 2388 | this->location()); |
2389 | } | |
2390 | ||
ea664253 | 2391 | Bexpression* |
2392 | do_get_backend(Translate_context*); | |
e440a328 | 2393 | |
2394 | void | |
2395 | do_export(Export*) const; | |
2396 | ||
d751bb78 | 2397 | void |
2398 | do_dump_expression(Ast_dump_context*) const; | |
abd26de0 | 2399 | |
e440a328 | 2400 | private: |
fcbea5e4 | 2401 | // The complex value. |
2402 | mpc_t val_; | |
e440a328 | 2403 | // The type if known. |
2404 | Type* type_; | |
2405 | }; | |
2406 | ||
e440a328 | 2407 | // Return the current type. If we haven't set the type yet, we return |
2408 | // an abstract complex type. | |
2409 | ||
2410 | Type* | |
2411 | Complex_expression::do_type() | |
2412 | { | |
2413 | if (this->type_ == NULL) | |
2414 | this->type_ = Type::make_abstract_complex_type(); | |
2415 | return this->type_; | |
2416 | } | |
2417 | ||
2418 | // Set the type of the complex value. Here we may switch from an | |
2419 | // abstract type to a real type. | |
2420 | ||
2421 | void | |
2422 | Complex_expression::do_determine_type(const Type_context* context) | |
2423 | { | |
2424 | if (this->type_ != NULL && !this->type_->is_abstract()) | |
2425 | ; | |
abd26de0 | 2426 | else if (context->type != NULL && context->type->is_numeric_type()) |
e440a328 | 2427 | this->type_ = context->type; |
2428 | else if (!context->may_be_abstract) | |
48080209 | 2429 | this->type_ = Type::lookup_complex_type("complex128"); |
e440a328 | 2430 | } |
2431 | ||
e440a328 | 2432 | // Check the type of a complex value. |
2433 | ||
2434 | void | |
2435 | Complex_expression::do_check_types(Gogo*) | |
2436 | { | |
0c77715b | 2437 | Type* type = this->type_; |
2438 | if (type == NULL) | |
e440a328 | 2439 | return; |
0c77715b | 2440 | Numeric_constant nc; |
fcbea5e4 | 2441 | nc.set_complex(NULL, this->val_); |
0c77715b | 2442 | if (!nc.set_type(this->type_, true, this->location())) |
e440a328 | 2443 | this->set_is_error(); |
2444 | } | |
2445 | ||
ea664253 | 2446 | // Get the backend representation for a complex constant. |
e440a328 | 2447 | |
ea664253 | 2448 | Bexpression* |
2449 | Complex_expression::do_get_backend(Translate_context* context) | |
e440a328 | 2450 | { |
48c2a53a | 2451 | Type* resolved_type; |
e440a328 | 2452 | if (this->type_ != NULL && !this->type_->is_abstract()) |
48c2a53a | 2453 | resolved_type = this->type_; |
2454 | else if (this->type_ != NULL && this->type_->integer_type() != NULL) | |
2455 | { | |
2456 | // We are converting to an abstract integer type. | |
2457 | resolved_type = Type::lookup_integer_type("int"); | |
2458 | } | |
2459 | else if (this->type_ != NULL && this->type_->float_type() != NULL) | |
2460 | { | |
2461 | // We are converting to an abstract float type. | |
2462 | resolved_type = Type::lookup_float_type("float64"); | |
2463 | } | |
e440a328 | 2464 | else |
2465 | { | |
47ae02b7 | 2466 | // If we still have an abstract type here, this is being |
e440a328 | 2467 | // used in a constant expression which didn't get reduced. We |
2468 | // just use complex128 and hope for the best. | |
48c2a53a | 2469 | resolved_type = Type::lookup_complex_type("complex128"); |
e440a328 | 2470 | } |
48c2a53a | 2471 | |
2472 | Numeric_constant nc; | |
fcbea5e4 | 2473 | nc.set_complex(resolved_type, this->val_); |
ea664253 | 2474 | return Expression::backend_numeric_constant_expression(context, &nc); |
e440a328 | 2475 | } |
2476 | ||
2477 | // Write REAL/IMAG to export data. | |
2478 | ||
2479 | void | |
fcbea5e4 | 2480 | Complex_expression::export_complex(String_dump* exp, const mpc_t val) |
e440a328 | 2481 | { |
fcbea5e4 | 2482 | if (!mpfr_zero_p(mpc_realref(val))) |
e440a328 | 2483 | { |
fcbea5e4 | 2484 | Float_expression::export_float(exp, mpc_realref(val)); |
d1db782d | 2485 | if (mpfr_sgn(mpc_imagref(val)) >= 0) |
e440a328 | 2486 | exp->write_c_string("+"); |
2487 | } | |
fcbea5e4 | 2488 | Float_expression::export_float(exp, mpc_imagref(val)); |
e440a328 | 2489 | exp->write_c_string("i"); |
2490 | } | |
2491 | ||
2492 | // Export a complex number in a constant expression. | |
2493 | ||
2494 | void | |
2495 | Complex_expression::do_export(Export* exp) const | |
2496 | { | |
fcbea5e4 | 2497 | Complex_expression::export_complex(exp, this->val_); |
e440a328 | 2498 | // A trailing space lets us reliably identify the end of the number. |
2499 | exp->write_c_string(" "); | |
2500 | } | |
2501 | ||
d751bb78 | 2502 | // Dump a complex expression to the dump file. |
2503 | ||
2504 | void | |
2505 | Complex_expression::do_dump_expression(Ast_dump_context* ast_dump_context) const | |
2506 | { | |
fcbea5e4 | 2507 | Complex_expression::export_complex(ast_dump_context, this->val_); |
d751bb78 | 2508 | } |
2509 | ||
e440a328 | 2510 | // Make a complex expression. |
2511 | ||
2512 | Expression* | |
fcbea5e4 | 2513 | Expression::make_complex(const mpc_t* val, Type* type, Location location) |
e440a328 | 2514 | { |
fcbea5e4 | 2515 | return new Complex_expression(val, type, location); |
e440a328 | 2516 | } |
2517 | ||
d5b605df | 2518 | // Find a named object in an expression. |
2519 | ||
2520 | class Find_named_object : public Traverse | |
2521 | { | |
2522 | public: | |
2523 | Find_named_object(Named_object* no) | |
2524 | : Traverse(traverse_expressions), | |
2525 | no_(no), found_(false) | |
2526 | { } | |
2527 | ||
2528 | // Whether we found the object. | |
2529 | bool | |
2530 | found() const | |
2531 | { return this->found_; } | |
2532 | ||
2533 | protected: | |
2534 | int | |
2535 | expression(Expression**); | |
2536 | ||
2537 | private: | |
2538 | // The object we are looking for. | |
2539 | Named_object* no_; | |
2540 | // Whether we found it. | |
2541 | bool found_; | |
2542 | }; | |
2543 | ||
e440a328 | 2544 | // A reference to a const in an expression. |
2545 | ||
2546 | class Const_expression : public Expression | |
2547 | { | |
2548 | public: | |
b13c66cd | 2549 | Const_expression(Named_object* constant, Location location) |
e440a328 | 2550 | : Expression(EXPRESSION_CONST_REFERENCE, location), |
13e818f5 | 2551 | constant_(constant), type_(NULL), seen_(false) |
e440a328 | 2552 | { } |
2553 | ||
d5b605df | 2554 | Named_object* |
2555 | named_object() | |
2556 | { return this->constant_; } | |
2557 | ||
a7f064d5 | 2558 | // Check that the initializer does not refer to the constant itself. |
2559 | void | |
2560 | check_for_init_loop(); | |
2561 | ||
e440a328 | 2562 | protected: |
ba4aedd4 | 2563 | int |
2564 | do_traverse(Traverse*); | |
2565 | ||
e440a328 | 2566 | Expression* |
ceeb4318 | 2567 | do_lower(Gogo*, Named_object*, Statement_inserter*, int); |
e440a328 | 2568 | |
2569 | bool | |
2570 | do_is_constant() const | |
2571 | { return true; } | |
2572 | ||
0e168074 | 2573 | bool |
2574 | do_is_immutable() const | |
2575 | { return true; } | |
2576 | ||
e440a328 | 2577 | bool |
0c77715b | 2578 | do_numeric_constant_value(Numeric_constant* nc) const; |
e440a328 | 2579 | |
2580 | bool | |
af6b489a | 2581 | do_string_constant_value(std::string* val) const; |
e440a328 | 2582 | |
2583 | Type* | |
2584 | do_type(); | |
2585 | ||
2586 | // The type of a const is set by the declaration, not the use. | |
2587 | void | |
2588 | do_determine_type(const Type_context*); | |
2589 | ||
2590 | void | |
2591 | do_check_types(Gogo*); | |
2592 | ||
2593 | Expression* | |
2594 | do_copy() | |
2595 | { return this; } | |
2596 | ||
ea664253 | 2597 | Bexpression* |
2598 | do_get_backend(Translate_context* context); | |
e440a328 | 2599 | |
2600 | // When exporting a reference to a const as part of a const | |
2601 | // expression, we export the value. We ignore the fact that it has | |
2602 | // a name. | |
2603 | void | |
2604 | do_export(Export* exp) const | |
2605 | { this->constant_->const_value()->expr()->export_expression(exp); } | |
2606 | ||
d751bb78 | 2607 | void |
2608 | do_dump_expression(Ast_dump_context*) const; | |
2609 | ||
e440a328 | 2610 | private: |
2611 | // The constant. | |
2612 | Named_object* constant_; | |
2613 | // The type of this reference. This is used if the constant has an | |
2614 | // abstract type. | |
2615 | Type* type_; | |
13e818f5 | 2616 | // Used to prevent infinite recursion when a constant incorrectly |
2617 | // refers to itself. | |
2618 | mutable bool seen_; | |
e440a328 | 2619 | }; |
2620 | ||
ba4aedd4 | 2621 | // Traversal. |
2622 | ||
2623 | int | |
2624 | Const_expression::do_traverse(Traverse* traverse) | |
2625 | { | |
2626 | if (this->type_ != NULL) | |
2627 | return Type::traverse(this->type_, traverse); | |
2628 | return TRAVERSE_CONTINUE; | |
2629 | } | |
2630 | ||
e440a328 | 2631 | // Lower a constant expression. This is where we convert the |
2632 | // predeclared constant iota into an integer value. | |
2633 | ||
2634 | Expression* | |
ceeb4318 | 2635 | Const_expression::do_lower(Gogo* gogo, Named_object*, |
2636 | Statement_inserter*, int iota_value) | |
e440a328 | 2637 | { |
2638 | if (this->constant_->const_value()->expr()->classification() | |
2639 | == EXPRESSION_IOTA) | |
2640 | { | |
2641 | if (iota_value == -1) | |
2642 | { | |
2643 | error_at(this->location(), | |
2644 | "iota is only defined in const declarations"); | |
2645 | iota_value = 0; | |
2646 | } | |
e67508fa | 2647 | return Expression::make_integer_ul(iota_value, NULL, this->location()); |
e440a328 | 2648 | } |
2649 | ||
2650 | // Make sure that the constant itself has been lowered. | |
2651 | gogo->lower_constant(this->constant_); | |
2652 | ||
2653 | return this; | |
2654 | } | |
2655 | ||
0c77715b | 2656 | // Return a numeric constant value. |
e440a328 | 2657 | |
2658 | bool | |
0c77715b | 2659 | Const_expression::do_numeric_constant_value(Numeric_constant* nc) const |
e440a328 | 2660 | { |
13e818f5 | 2661 | if (this->seen_) |
2662 | return false; | |
2663 | ||
e440a328 | 2664 | Expression* e = this->constant_->const_value()->expr(); |
0c77715b | 2665 | |
13e818f5 | 2666 | this->seen_ = true; |
2667 | ||
0c77715b | 2668 | bool r = e->numeric_constant_value(nc); |
e440a328 | 2669 | |
13e818f5 | 2670 | this->seen_ = false; |
2671 | ||
e440a328 | 2672 | Type* ctype; |
2673 | if (this->type_ != NULL) | |
2674 | ctype = this->type_; | |
2675 | else | |
2676 | ctype = this->constant_->const_value()->type(); | |
e440a328 | 2677 | if (r && ctype != NULL) |
2678 | { | |
0c77715b | 2679 | if (!nc->set_type(ctype, false, this->location())) |
e440a328 | 2680 | return false; |
e440a328 | 2681 | } |
e440a328 | 2682 | |
e440a328 | 2683 | return r; |
2684 | } | |
2685 | ||
af6b489a | 2686 | bool |
2687 | Const_expression::do_string_constant_value(std::string* val) const | |
2688 | { | |
2689 | if (this->seen_) | |
2690 | return false; | |
2691 | ||
2692 | Expression* e = this->constant_->const_value()->expr(); | |
2693 | ||
2694 | this->seen_ = true; | |
2695 | bool ok = e->string_constant_value(val); | |
2696 | this->seen_ = false; | |
2697 | ||
2698 | return ok; | |
2699 | } | |
2700 | ||
e440a328 | 2701 | // Return the type of the const reference. |
2702 | ||
2703 | Type* | |
2704 | Const_expression::do_type() | |
2705 | { | |
2706 | if (this->type_ != NULL) | |
2707 | return this->type_; | |
13e818f5 | 2708 | |
2f78f012 | 2709 | Named_constant* nc = this->constant_->const_value(); |
2710 | ||
2711 | if (this->seen_ || nc->lowering()) | |
13e818f5 | 2712 | { |
2713 | this->report_error(_("constant refers to itself")); | |
2714 | this->type_ = Type::make_error_type(); | |
2715 | return this->type_; | |
2716 | } | |
2717 | ||
2718 | this->seen_ = true; | |
2719 | ||
e440a328 | 2720 | Type* ret = nc->type(); |
13e818f5 | 2721 | |
e440a328 | 2722 | if (ret != NULL) |
13e818f5 | 2723 | { |
2724 | this->seen_ = false; | |
2725 | return ret; | |
2726 | } | |
2727 | ||
e440a328 | 2728 | // During parsing, a named constant may have a NULL type, but we |
2729 | // must not return a NULL type here. | |
13e818f5 | 2730 | ret = nc->expr()->type(); |
2731 | ||
2732 | this->seen_ = false; | |
2733 | ||
2734 | return ret; | |
e440a328 | 2735 | } |
2736 | ||
2737 | // Set the type of the const reference. | |
2738 | ||
2739 | void | |
2740 | Const_expression::do_determine_type(const Type_context* context) | |
2741 | { | |
2742 | Type* ctype = this->constant_->const_value()->type(); | |
2743 | Type* cetype = (ctype != NULL | |
2744 | ? ctype | |
2745 | : this->constant_->const_value()->expr()->type()); | |
2746 | if (ctype != NULL && !ctype->is_abstract()) | |
2747 | ; | |
2748 | else if (context->type != NULL | |
0c77715b | 2749 | && context->type->is_numeric_type() |
2750 | && cetype->is_numeric_type()) | |
e440a328 | 2751 | this->type_ = context->type; |
2752 | else if (context->type != NULL | |
2753 | && context->type->is_string_type() | |
2754 | && cetype->is_string_type()) | |
2755 | this->type_ = context->type; | |
2756 | else if (context->type != NULL | |
2757 | && context->type->is_boolean_type() | |
2758 | && cetype->is_boolean_type()) | |
2759 | this->type_ = context->type; | |
2760 | else if (!context->may_be_abstract) | |
2761 | { | |
2762 | if (cetype->is_abstract()) | |
2763 | cetype = cetype->make_non_abstract_type(); | |
2764 | this->type_ = cetype; | |
2765 | } | |
2766 | } | |
2767 | ||
a7f064d5 | 2768 | // Check for a loop in which the initializer of a constant refers to |
2769 | // the constant itself. | |
e440a328 | 2770 | |
2771 | void | |
a7f064d5 | 2772 | Const_expression::check_for_init_loop() |
e440a328 | 2773 | { |
5c13bd80 | 2774 | if (this->type_ != NULL && this->type_->is_error()) |
d5b605df | 2775 | return; |
2776 | ||
a7f064d5 | 2777 | if (this->seen_) |
2778 | { | |
2779 | this->report_error(_("constant refers to itself")); | |
2780 | this->type_ = Type::make_error_type(); | |
2781 | return; | |
2782 | } | |
2783 | ||
d5b605df | 2784 | Expression* init = this->constant_->const_value()->expr(); |
2785 | Find_named_object find_named_object(this->constant_); | |
a7f064d5 | 2786 | |
2787 | this->seen_ = true; | |
d5b605df | 2788 | Expression::traverse(&init, &find_named_object); |
a7f064d5 | 2789 | this->seen_ = false; |
2790 | ||
d5b605df | 2791 | if (find_named_object.found()) |
2792 | { | |
5c13bd80 | 2793 | if (this->type_ == NULL || !this->type_->is_error()) |
a7f064d5 | 2794 | { |
2795 | this->report_error(_("constant refers to itself")); | |
2796 | this->type_ = Type::make_error_type(); | |
2797 | } | |
d5b605df | 2798 | return; |
2799 | } | |
a7f064d5 | 2800 | } |
2801 | ||
2802 | // Check types of a const reference. | |
2803 | ||
2804 | void | |
2805 | Const_expression::do_check_types(Gogo*) | |
2806 | { | |
5c13bd80 | 2807 | if (this->type_ != NULL && this->type_->is_error()) |
a7f064d5 | 2808 | return; |
2809 | ||
2810 | this->check_for_init_loop(); | |
d5b605df | 2811 | |
0c77715b | 2812 | // Check that numeric constant fits in type. |
2813 | if (this->type_ != NULL && this->type_->is_numeric_type()) | |
e440a328 | 2814 | { |
0c77715b | 2815 | Numeric_constant nc; |
2816 | if (this->constant_->const_value()->expr()->numeric_constant_value(&nc)) | |
e440a328 | 2817 | { |
0c77715b | 2818 | if (!nc.set_type(this->type_, true, this->location())) |
2819 | this->set_is_error(); | |
e440a328 | 2820 | } |
e440a328 | 2821 | } |
2822 | } | |
2823 | ||
ea664253 | 2824 | // Return the backend representation for a const reference. |
e440a328 | 2825 | |
ea664253 | 2826 | Bexpression* |
2827 | Const_expression::do_get_backend(Translate_context* context) | |
e440a328 | 2828 | { |
2c809f8f | 2829 | if (this->type_ != NULL && this->type_->is_error()) |
ea664253 | 2830 | return context->backend()->error_expression(); |
e440a328 | 2831 | |
2832 | // If the type has been set for this expression, but the underlying | |
2833 | // object is an abstract int or float, we try to get the abstract | |
2834 | // value. Otherwise we may lose something in the conversion. | |
f2de4532 | 2835 | Expression* expr = this->constant_->const_value()->expr(); |
e440a328 | 2836 | if (this->type_ != NULL |
0c77715b | 2837 | && this->type_->is_numeric_type() |
a68492b4 | 2838 | && (this->constant_->const_value()->type() == NULL |
2839 | || this->constant_->const_value()->type()->is_abstract())) | |
e440a328 | 2840 | { |
0c77715b | 2841 | Numeric_constant nc; |
2842 | if (expr->numeric_constant_value(&nc) | |
2843 | && nc.set_type(this->type_, false, this->location())) | |
e440a328 | 2844 | { |
0c77715b | 2845 | Expression* e = nc.expression(this->location()); |
ea664253 | 2846 | return e->get_backend(context); |
e440a328 | 2847 | } |
e440a328 | 2848 | } |
2849 | ||
2c809f8f | 2850 | if (this->type_ != NULL) |
f2de4532 | 2851 | expr = Expression::make_cast(this->type_, expr, this->location()); |
ea664253 | 2852 | return expr->get_backend(context); |
e440a328 | 2853 | } |
2854 | ||
d751bb78 | 2855 | // Dump ast representation for constant expression. |
2856 | ||
2857 | void | |
2858 | Const_expression::do_dump_expression(Ast_dump_context* ast_dump_context) const | |
2859 | { | |
2860 | ast_dump_context->ostream() << this->constant_->name(); | |
2861 | } | |
2862 | ||
e440a328 | 2863 | // Make a reference to a constant in an expression. |
2864 | ||
2865 | Expression* | |
2866 | Expression::make_const_reference(Named_object* constant, | |
b13c66cd | 2867 | Location location) |
e440a328 | 2868 | { |
2869 | return new Const_expression(constant, location); | |
2870 | } | |
2871 | ||
d5b605df | 2872 | // Find a named object in an expression. |
2873 | ||
2874 | int | |
2875 | Find_named_object::expression(Expression** pexpr) | |
2876 | { | |
2877 | switch ((*pexpr)->classification()) | |
2878 | { | |
2879 | case Expression::EXPRESSION_CONST_REFERENCE: | |
a7f064d5 | 2880 | { |
2881 | Const_expression* ce = static_cast<Const_expression*>(*pexpr); | |
2882 | if (ce->named_object() == this->no_) | |
2883 | break; | |
2884 | ||
2885 | // We need to check a constant initializer explicitly, as | |
2886 | // loops here will not be caught by the loop checking for | |
2887 | // variable initializers. | |
2888 | ce->check_for_init_loop(); | |
2889 | ||
2890 | return TRAVERSE_CONTINUE; | |
2891 | } | |
2892 | ||
d5b605df | 2893 | case Expression::EXPRESSION_VAR_REFERENCE: |
2894 | if ((*pexpr)->var_expression()->named_object() == this->no_) | |
2895 | break; | |
2896 | return TRAVERSE_CONTINUE; | |
2897 | case Expression::EXPRESSION_FUNC_REFERENCE: | |
2898 | if ((*pexpr)->func_expression()->named_object() == this->no_) | |
2899 | break; | |
2900 | return TRAVERSE_CONTINUE; | |
2901 | default: | |
2902 | return TRAVERSE_CONTINUE; | |
2903 | } | |
2904 | this->found_ = true; | |
2905 | return TRAVERSE_EXIT; | |
2906 | } | |
2907 | ||
e440a328 | 2908 | // The nil value. |
2909 | ||
2910 | class Nil_expression : public Expression | |
2911 | { | |
2912 | public: | |
b13c66cd | 2913 | Nil_expression(Location location) |
e440a328 | 2914 | : Expression(EXPRESSION_NIL, location) |
2915 | { } | |
2916 | ||
2917 | static Expression* | |
2918 | do_import(Import*); | |
2919 | ||
2920 | protected: | |
2921 | bool | |
2922 | do_is_constant() const | |
2923 | { return true; } | |
2924 | ||
f9ca30f9 | 2925 | bool |
2926 | do_is_immutable() const | |
2927 | { return true; } | |
2928 | ||
e440a328 | 2929 | Type* |
2930 | do_type() | |
2931 | { return Type::make_nil_type(); } | |
2932 | ||
2933 | void | |
2934 | do_determine_type(const Type_context*) | |
2935 | { } | |
2936 | ||
2937 | Expression* | |
2938 | do_copy() | |
2939 | { return this; } | |
2940 | ||
ea664253 | 2941 | Bexpression* |
2942 | do_get_backend(Translate_context* context) | |
2943 | { return context->backend()->nil_pointer_expression(); } | |
e440a328 | 2944 | |
2945 | void | |
2946 | do_export(Export* exp) const | |
2947 | { exp->write_c_string("nil"); } | |
d751bb78 | 2948 | |
2949 | void | |
2950 | do_dump_expression(Ast_dump_context* ast_dump_context) const | |
2951 | { ast_dump_context->ostream() << "nil"; } | |
e440a328 | 2952 | }; |
2953 | ||
2954 | // Import a nil expression. | |
2955 | ||
2956 | Expression* | |
2957 | Nil_expression::do_import(Import* imp) | |
2958 | { | |
2959 | imp->require_c_string("nil"); | |
2960 | return Expression::make_nil(imp->location()); | |
2961 | } | |
2962 | ||
2963 | // Make a nil expression. | |
2964 | ||
2965 | Expression* | |
b13c66cd | 2966 | Expression::make_nil(Location location) |
e440a328 | 2967 | { |
2968 | return new Nil_expression(location); | |
2969 | } | |
2970 | ||
2971 | // The value of the predeclared constant iota. This is little more | |
2972 | // than a marker. This will be lowered to an integer in | |
2973 | // Const_expression::do_lower, which is where we know the value that | |
2974 | // it should have. | |
2975 | ||
2976 | class Iota_expression : public Parser_expression | |
2977 | { | |
2978 | public: | |
b13c66cd | 2979 | Iota_expression(Location location) |
e440a328 | 2980 | : Parser_expression(EXPRESSION_IOTA, location) |
2981 | { } | |
2982 | ||
2983 | protected: | |
2984 | Expression* | |
ceeb4318 | 2985 | do_lower(Gogo*, Named_object*, Statement_inserter*, int) |
c3e6f413 | 2986 | { go_unreachable(); } |
e440a328 | 2987 | |
2988 | // There should only ever be one of these. | |
2989 | Expression* | |
2990 | do_copy() | |
c3e6f413 | 2991 | { go_unreachable(); } |
d751bb78 | 2992 | |
2993 | void | |
2994 | do_dump_expression(Ast_dump_context* ast_dump_context) const | |
2995 | { ast_dump_context->ostream() << "iota"; } | |
e440a328 | 2996 | }; |
2997 | ||
2998 | // Make an iota expression. This is only called for one case: the | |
2999 | // value of the predeclared constant iota. | |
3000 | ||
3001 | Expression* | |
3002 | Expression::make_iota() | |
3003 | { | |
b13c66cd | 3004 | static Iota_expression iota_expression(Linemap::unknown_location()); |
e440a328 | 3005 | return &iota_expression; |
3006 | } | |
3007 | ||
da244e59 | 3008 | // Class Type_conversion_expression. |
e440a328 | 3009 | |
3010 | // Traversal. | |
3011 | ||
3012 | int | |
3013 | Type_conversion_expression::do_traverse(Traverse* traverse) | |
3014 | { | |
3015 | if (Expression::traverse(&this->expr_, traverse) == TRAVERSE_EXIT | |
3016 | || Type::traverse(this->type_, traverse) == TRAVERSE_EXIT) | |
3017 | return TRAVERSE_EXIT; | |
3018 | return TRAVERSE_CONTINUE; | |
3019 | } | |
3020 | ||
3021 | // Convert to a constant at lowering time. | |
3022 | ||
3023 | Expression* | |
ceeb4318 | 3024 | Type_conversion_expression::do_lower(Gogo*, Named_object*, |
3025 | Statement_inserter*, int) | |
e440a328 | 3026 | { |
3027 | Type* type = this->type_; | |
3028 | Expression* val = this->expr_; | |
b13c66cd | 3029 | Location location = this->location(); |
e440a328 | 3030 | |
0c77715b | 3031 | if (type->is_numeric_type()) |
e440a328 | 3032 | { |
0c77715b | 3033 | Numeric_constant nc; |
3034 | if (val->numeric_constant_value(&nc)) | |
e440a328 | 3035 | { |
0c77715b | 3036 | if (!nc.set_type(type, true, location)) |
3037 | return Expression::make_error(location); | |
3038 | return nc.expression(location); | |
e440a328 | 3039 | } |
e440a328 | 3040 | } |
3041 | ||
55072f2b | 3042 | if (type->is_slice_type()) |
e440a328 | 3043 | { |
3044 | Type* element_type = type->array_type()->element_type()->forwarded(); | |
60963afd | 3045 | bool is_byte = (element_type->integer_type() != NULL |
3046 | && element_type->integer_type()->is_byte()); | |
3047 | bool is_rune = (element_type->integer_type() != NULL | |
3048 | && element_type->integer_type()->is_rune()); | |
3049 | if (is_byte || is_rune) | |
e440a328 | 3050 | { |
3051 | std::string s; | |
3052 | if (val->string_constant_value(&s)) | |
3053 | { | |
3054 | Expression_list* vals = new Expression_list(); | |
3055 | if (is_byte) | |
3056 | { | |
3057 | for (std::string::const_iterator p = s.begin(); | |
3058 | p != s.end(); | |
3059 | p++) | |
3060 | { | |
e67508fa | 3061 | unsigned char c = static_cast<unsigned char>(*p); |
3062 | vals->push_back(Expression::make_integer_ul(c, | |
3063 | element_type, | |
3064 | location)); | |
e440a328 | 3065 | } |
3066 | } | |
3067 | else | |
3068 | { | |
3069 | const char *p = s.data(); | |
3070 | const char *pend = s.data() + s.length(); | |
3071 | while (p < pend) | |
3072 | { | |
3073 | unsigned int c; | |
3074 | int adv = Lex::fetch_char(p, &c); | |
3075 | if (adv == 0) | |
3076 | { | |
3077 | warning_at(this->location(), 0, | |
3078 | "invalid UTF-8 encoding"); | |
3079 | adv = 1; | |
3080 | } | |
3081 | p += adv; | |
e67508fa | 3082 | vals->push_back(Expression::make_integer_ul(c, |
3083 | element_type, | |
3084 | location)); | |
e440a328 | 3085 | } |
3086 | } | |
3087 | ||
3088 | return Expression::make_slice_composite_literal(type, vals, | |
3089 | location); | |
3090 | } | |
3091 | } | |
3092 | } | |
3093 | ||
3094 | return this; | |
3095 | } | |
3096 | ||
35a54f17 | 3097 | // Flatten a type conversion by using a temporary variable for the slice |
3098 | // in slice to string conversions. | |
3099 | ||
3100 | Expression* | |
3101 | Type_conversion_expression::do_flatten(Gogo*, Named_object*, | |
3102 | Statement_inserter* inserter) | |
3103 | { | |
5bf8be8b | 3104 | if (this->type()->is_error_type() || this->expr_->is_error_expression()) |
3105 | { | |
3106 | go_assert(saw_errors()); | |
3107 | return Expression::make_error(this->location()); | |
3108 | } | |
3109 | ||
2c809f8f | 3110 | if (((this->type()->is_string_type() |
3111 | && this->expr_->type()->is_slice_type()) | |
8ba8cc87 | 3112 | || this->expr_->type()->interface_type() != NULL) |
35a54f17 | 3113 | && !this->expr_->is_variable()) |
3114 | { | |
3115 | Temporary_statement* temp = | |
3116 | Statement::make_temporary(NULL, this->expr_, this->location()); | |
3117 | inserter->insert(temp); | |
3118 | this->expr_ = Expression::make_temporary_reference(temp, this->location()); | |
3119 | } | |
3120 | return this; | |
3121 | } | |
3122 | ||
1ca01a59 | 3123 | // Return whether a type conversion is a constant. |
3124 | ||
3125 | bool | |
3126 | Type_conversion_expression::do_is_constant() const | |
3127 | { | |
3128 | if (!this->expr_->is_constant()) | |
3129 | return false; | |
3130 | ||
3131 | // A conversion to a type that may not be used as a constant is not | |
3132 | // a constant. For example, []byte(nil). | |
3133 | Type* type = this->type_; | |
3134 | if (type->integer_type() == NULL | |
3135 | && type->float_type() == NULL | |
3136 | && type->complex_type() == NULL | |
3137 | && !type->is_boolean_type() | |
3138 | && !type->is_string_type()) | |
3139 | return false; | |
3140 | ||
3141 | return true; | |
3142 | } | |
3143 | ||
0e168074 | 3144 | // Return whether a type conversion is immutable. |
3145 | ||
3146 | bool | |
3147 | Type_conversion_expression::do_is_immutable() const | |
3148 | { | |
3149 | Type* type = this->type_; | |
3150 | Type* expr_type = this->expr_->type(); | |
3151 | ||
3152 | if (type->interface_type() != NULL | |
3153 | || expr_type->interface_type() != NULL) | |
3154 | return false; | |
3155 | ||
3156 | if (!this->expr_->is_immutable()) | |
3157 | return false; | |
3158 | ||
3159 | if (Type::are_identical(type, expr_type, false, NULL)) | |
3160 | return true; | |
3161 | ||
3162 | return type->is_basic_type() && expr_type->is_basic_type(); | |
3163 | } | |
3164 | ||
0c77715b | 3165 | // Return the constant numeric value if there is one. |
e440a328 | 3166 | |
3167 | bool | |
0c77715b | 3168 | Type_conversion_expression::do_numeric_constant_value( |
3169 | Numeric_constant* nc) const | |
e440a328 | 3170 | { |
0c77715b | 3171 | if (!this->type_->is_numeric_type()) |
e440a328 | 3172 | return false; |
0c77715b | 3173 | if (!this->expr_->numeric_constant_value(nc)) |
e440a328 | 3174 | return false; |
0c77715b | 3175 | return nc->set_type(this->type_, false, this->location()); |
e440a328 | 3176 | } |
3177 | ||
3178 | // Return the constant string value if there is one. | |
3179 | ||
3180 | bool | |
3181 | Type_conversion_expression::do_string_constant_value(std::string* val) const | |
3182 | { | |
3183 | if (this->type_->is_string_type() | |
3184 | && this->expr_->type()->integer_type() != NULL) | |
3185 | { | |
0c77715b | 3186 | Numeric_constant nc; |
3187 | if (this->expr_->numeric_constant_value(&nc)) | |
e440a328 | 3188 | { |
0c77715b | 3189 | unsigned long ival; |
3190 | if (nc.to_unsigned_long(&ival) == Numeric_constant::NC_UL_VALID) | |
e440a328 | 3191 | { |
0c77715b | 3192 | val->clear(); |
3193 | Lex::append_char(ival, true, val, this->location()); | |
e440a328 | 3194 | return true; |
3195 | } | |
3196 | } | |
e440a328 | 3197 | } |
3198 | ||
3199 | // FIXME: Could handle conversion from const []int here. | |
3200 | ||
3201 | return false; | |
3202 | } | |
3203 | ||
da244e59 | 3204 | // Determine the resulting type of the conversion. |
3205 | ||
3206 | void | |
3207 | Type_conversion_expression::do_determine_type(const Type_context*) | |
3208 | { | |
3209 | Type_context subcontext(this->type_, false); | |
3210 | this->expr_->determine_type(&subcontext); | |
3211 | } | |
3212 | ||
e440a328 | 3213 | // Check that types are convertible. |
3214 | ||
3215 | void | |
3216 | Type_conversion_expression::do_check_types(Gogo*) | |
3217 | { | |
3218 | Type* type = this->type_; | |
3219 | Type* expr_type = this->expr_->type(); | |
3220 | std::string reason; | |
3221 | ||
5c13bd80 | 3222 | if (type->is_error() || expr_type->is_error()) |
842f6425 | 3223 | { |
842f6425 | 3224 | this->set_is_error(); |
3225 | return; | |
3226 | } | |
3227 | ||
e440a328 | 3228 | if (this->may_convert_function_types_ |
3229 | && type->function_type() != NULL | |
3230 | && expr_type->function_type() != NULL) | |
3231 | return; | |
3232 | ||
3233 | if (Type::are_convertible(type, expr_type, &reason)) | |
3234 | return; | |
3235 | ||
3236 | error_at(this->location(), "%s", reason.c_str()); | |
3237 | this->set_is_error(); | |
3238 | } | |
3239 | ||
ea664253 | 3240 | // Get the backend representation for a type conversion. |
e440a328 | 3241 | |
ea664253 | 3242 | Bexpression* |
3243 | Type_conversion_expression::do_get_backend(Translate_context* context) | |
e440a328 | 3244 | { |
e440a328 | 3245 | Type* type = this->type_; |
3246 | Type* expr_type = this->expr_->type(); | |
2c809f8f | 3247 | |
3248 | Gogo* gogo = context->gogo(); | |
3249 | Btype* btype = type->get_backend(gogo); | |
ea664253 | 3250 | Bexpression* bexpr = this->expr_->get_backend(context); |
2c809f8f | 3251 | Location loc = this->location(); |
3252 | ||
3253 | if (Type::are_identical(type, expr_type, false, NULL)) | |
ea664253 | 3254 | return gogo->backend()->convert_expression(btype, bexpr, loc); |
2c809f8f | 3255 | else if (type->interface_type() != NULL |
3256 | || expr_type->interface_type() != NULL) | |
e440a328 | 3257 | { |
2c809f8f | 3258 | Expression* conversion = |
3259 | Expression::convert_for_assignment(gogo, type, this->expr_, | |
3260 | this->location()); | |
ea664253 | 3261 | return conversion->get_backend(context); |
e440a328 | 3262 | } |
3263 | else if (type->is_string_type() | |
3264 | && expr_type->integer_type() != NULL) | |
3265 | { | |
2c809f8f | 3266 | mpz_t intval; |
3267 | Numeric_constant nc; | |
3268 | if (this->expr_->numeric_constant_value(&nc) | |
3269 | && nc.to_int(&intval) | |
3270 | && mpz_fits_ushort_p(intval)) | |
e440a328 | 3271 | { |
e440a328 | 3272 | std::string s; |
2c809f8f | 3273 | Lex::append_char(mpz_get_ui(intval), true, &s, loc); |
3274 | mpz_clear(intval); | |
3275 | Expression* se = Expression::make_string(s, loc); | |
ea664253 | 3276 | return se->get_backend(context); |
e440a328 | 3277 | } |
3278 | ||
f16ab008 | 3279 | Expression* i2s_expr = |
2c809f8f | 3280 | Runtime::make_call(Runtime::INT_TO_STRING, loc, 1, this->expr_); |
ea664253 | 3281 | return Expression::make_cast(type, i2s_expr, loc)->get_backend(context); |
e440a328 | 3282 | } |
55072f2b | 3283 | else if (type->is_string_type() && expr_type->is_slice_type()) |
e440a328 | 3284 | { |
55072f2b | 3285 | Array_type* a = expr_type->array_type(); |
e440a328 | 3286 | Type* e = a->element_type()->forwarded(); |
c484d925 | 3287 | go_assert(e->integer_type() != NULL); |
35a54f17 | 3288 | go_assert(this->expr_->is_variable()); |
3289 | ||
3290 | Runtime::Function code; | |
60963afd | 3291 | if (e->integer_type()->is_byte()) |
35a54f17 | 3292 | code = Runtime::BYTE_ARRAY_TO_STRING; |
e440a328 | 3293 | else |
35a54f17 | 3294 | { |
3295 | go_assert(e->integer_type()->is_rune()); | |
3296 | code = Runtime::INT_ARRAY_TO_STRING; | |
3297 | } | |
3298 | Expression* valptr = a->get_value_pointer(gogo, this->expr_); | |
3299 | Expression* len = a->get_length(gogo, this->expr_); | |
ea664253 | 3300 | return Runtime::make_call(code, loc, 2, valptr, |
3301 | len)->get_backend(context); | |
e440a328 | 3302 | } |
411eb89e | 3303 | else if (type->is_slice_type() && expr_type->is_string_type()) |
e440a328 | 3304 | { |
3305 | Type* e = type->array_type()->element_type()->forwarded(); | |
c484d925 | 3306 | go_assert(e->integer_type() != NULL); |
6c252e42 | 3307 | |
2c809f8f | 3308 | Runtime::Function code; |
60963afd | 3309 | if (e->integer_type()->is_byte()) |
2c809f8f | 3310 | code = Runtime::STRING_TO_BYTE_ARRAY; |
e440a328 | 3311 | else |
3312 | { | |
60963afd | 3313 | go_assert(e->integer_type()->is_rune()); |
2c809f8f | 3314 | code = Runtime::STRING_TO_INT_ARRAY; |
e440a328 | 3315 | } |
2c809f8f | 3316 | Expression* s2a = Runtime::make_call(code, loc, 1, this->expr_); |
ea664253 | 3317 | return Expression::make_unsafe_cast(type, s2a, loc)->get_backend(context); |
2c809f8f | 3318 | } |
3319 | else if (type->is_numeric_type()) | |
3320 | { | |
3321 | go_assert(Type::are_convertible(type, expr_type, NULL)); | |
ea664253 | 3322 | return gogo->backend()->convert_expression(btype, bexpr, loc); |
e440a328 | 3323 | } |
3324 | else if ((type->is_unsafe_pointer_type() | |
2c809f8f | 3325 | && (expr_type->points_to() != NULL |
3326 | || expr_type->integer_type())) | |
3327 | || (expr_type->is_unsafe_pointer_type() | |
3328 | && type->points_to() != NULL) | |
3329 | || (this->may_convert_function_types_ | |
3330 | && type->function_type() != NULL | |
3331 | && expr_type->function_type() != NULL)) | |
ea664253 | 3332 | return gogo->backend()->convert_expression(btype, bexpr, loc); |
e440a328 | 3333 | else |
2c809f8f | 3334 | { |
3335 | Expression* conversion = | |
3336 | Expression::convert_for_assignment(gogo, type, this->expr_, loc); | |
ea664253 | 3337 | return conversion->get_backend(context); |
2c809f8f | 3338 | } |
e440a328 | 3339 | } |
3340 | ||
3341 | // Output a type conversion in a constant expression. | |
3342 | ||
3343 | void | |
3344 | Type_conversion_expression::do_export(Export* exp) const | |
3345 | { | |
3346 | exp->write_c_string("convert("); | |
3347 | exp->write_type(this->type_); | |
3348 | exp->write_c_string(", "); | |
3349 | this->expr_->export_expression(exp); | |
3350 | exp->write_c_string(")"); | |
3351 | } | |
3352 | ||
3353 | // Import a type conversion or a struct construction. | |
3354 | ||
3355 | Expression* | |
3356 | Type_conversion_expression::do_import(Import* imp) | |
3357 | { | |
3358 | imp->require_c_string("convert("); | |
3359 | Type* type = imp->read_type(); | |
3360 | imp->require_c_string(", "); | |
3361 | Expression* val = Expression::import_expression(imp); | |
3362 | imp->require_c_string(")"); | |
3363 | return Expression::make_cast(type, val, imp->location()); | |
3364 | } | |
3365 | ||
d751bb78 | 3366 | // Dump ast representation for a type conversion expression. |
3367 | ||
3368 | void | |
3369 | Type_conversion_expression::do_dump_expression( | |
3370 | Ast_dump_context* ast_dump_context) const | |
3371 | { | |
3372 | ast_dump_context->dump_type(this->type_); | |
3373 | ast_dump_context->ostream() << "("; | |
3374 | ast_dump_context->dump_expression(this->expr_); | |
3375 | ast_dump_context->ostream() << ") "; | |
3376 | } | |
3377 | ||
e440a328 | 3378 | // Make a type cast expression. |
3379 | ||
3380 | Expression* | |
b13c66cd | 3381 | Expression::make_cast(Type* type, Expression* val, Location location) |
e440a328 | 3382 | { |
3383 | if (type->is_error_type() || val->is_error_expression()) | |
3384 | return Expression::make_error(location); | |
3385 | return new Type_conversion_expression(type, val, location); | |
3386 | } | |
3387 | ||
98f62f7a | 3388 | // Class Unsafe_type_conversion_expression. |
9581e91d | 3389 | |
3390 | // Traversal. | |
3391 | ||
3392 | int | |
3393 | Unsafe_type_conversion_expression::do_traverse(Traverse* traverse) | |
3394 | { | |
3395 | if (Expression::traverse(&this->expr_, traverse) == TRAVERSE_EXIT | |
3396 | || Type::traverse(this->type_, traverse) == TRAVERSE_EXIT) | |
3397 | return TRAVERSE_EXIT; | |
3398 | return TRAVERSE_CONTINUE; | |
3399 | } | |
3400 | ||
aa5ae575 | 3401 | // Return whether an unsafe type conversion is immutable. |
3402 | ||
3403 | bool | |
3404 | Unsafe_type_conversion_expression::do_is_immutable() const | |
3405 | { | |
3406 | Type* type = this->type_; | |
3407 | Type* expr_type = this->expr_->type(); | |
3408 | ||
3409 | if (type->interface_type() != NULL | |
3410 | || expr_type->interface_type() != NULL) | |
3411 | return false; | |
3412 | ||
3413 | if (!this->expr_->is_immutable()) | |
3414 | return false; | |
3415 | ||
3416 | if (Type::are_convertible(type, expr_type, NULL)) | |
3417 | return true; | |
3418 | ||
3419 | return type->is_basic_type() && expr_type->is_basic_type(); | |
3420 | } | |
3421 | ||
9581e91d | 3422 | // Convert to backend representation. |
3423 | ||
ea664253 | 3424 | Bexpression* |
3425 | Unsafe_type_conversion_expression::do_get_backend(Translate_context* context) | |
9581e91d | 3426 | { |
3427 | // We are only called for a limited number of cases. | |
3428 | ||
3429 | Type* t = this->type_; | |
3430 | Type* et = this->expr_->type(); | |
2c809f8f | 3431 | if (t->array_type() != NULL) |
3432 | go_assert(et->array_type() != NULL | |
3433 | && t->is_slice_type() == et->is_slice_type()); | |
3434 | else if (t->struct_type() != NULL) | |
9581e91d | 3435 | { |
2c809f8f | 3436 | if (t->named_type() != NULL |
3437 | && et->named_type() != NULL | |
3438 | && !Type::are_convertible(t, et, NULL)) | |
3439 | { | |
3440 | go_assert(saw_errors()); | |
ea664253 | 3441 | return context->backend()->error_expression(); |
2c809f8f | 3442 | } |
3443 | ||
3444 | go_assert(et->struct_type() != NULL | |
3445 | && Type::are_convertible(t, et, NULL)); | |
3446 | } | |
3447 | else if (t->map_type() != NULL) | |
c484d925 | 3448 | go_assert(et->map_type() != NULL); |
9581e91d | 3449 | else if (t->channel_type() != NULL) |
c484d925 | 3450 | go_assert(et->channel_type() != NULL); |
09ea332d | 3451 | else if (t->points_to() != NULL) |
2c809f8f | 3452 | go_assert(et->points_to() != NULL |
3453 | || et->channel_type() != NULL | |
3454 | || et->map_type() != NULL | |
3455 | || et->function_type() != NULL | |
3456 | || et->is_nil_type()); | |
9581e91d | 3457 | else if (et->is_unsafe_pointer_type()) |
c484d925 | 3458 | go_assert(t->points_to() != NULL); |
2c809f8f | 3459 | else if (t->interface_type() != NULL) |
9581e91d | 3460 | { |
2c809f8f | 3461 | bool empty_iface = t->interface_type()->is_empty(); |
c484d925 | 3462 | go_assert(et->interface_type() != NULL |
2c809f8f | 3463 | && et->interface_type()->is_empty() == empty_iface); |
9581e91d | 3464 | } |
588e3cf9 | 3465 | else if (t->integer_type() != NULL) |
2c809f8f | 3466 | go_assert(et->is_boolean_type() |
3467 | || et->integer_type() != NULL | |
3468 | || et->function_type() != NULL | |
3469 | || et->points_to() != NULL | |
3470 | || et->map_type() != NULL | |
8ba8cc87 | 3471 | || et->channel_type() != NULL |
3472 | || et->is_nil_type()); | |
9581e91d | 3473 | else |
c3e6f413 | 3474 | go_unreachable(); |
9581e91d | 3475 | |
2c809f8f | 3476 | Gogo* gogo = context->gogo(); |
3477 | Btype* btype = t->get_backend(gogo); | |
ea664253 | 3478 | Bexpression* bexpr = this->expr_->get_backend(context); |
2c809f8f | 3479 | Location loc = this->location(); |
ea664253 | 3480 | return gogo->backend()->convert_expression(btype, bexpr, loc); |
9581e91d | 3481 | } |
3482 | ||
d751bb78 | 3483 | // Dump ast representation for an unsafe type conversion expression. |
3484 | ||
3485 | void | |
3486 | Unsafe_type_conversion_expression::do_dump_expression( | |
3487 | Ast_dump_context* ast_dump_context) const | |
3488 | { | |
3489 | ast_dump_context->dump_type(this->type_); | |
3490 | ast_dump_context->ostream() << "("; | |
3491 | ast_dump_context->dump_expression(this->expr_); | |
3492 | ast_dump_context->ostream() << ") "; | |
3493 | } | |
3494 | ||
9581e91d | 3495 | // Make an unsafe type conversion expression. |
3496 | ||
3497 | Expression* | |
3498 | Expression::make_unsafe_cast(Type* type, Expression* expr, | |
b13c66cd | 3499 | Location location) |
9581e91d | 3500 | { |
3501 | return new Unsafe_type_conversion_expression(type, expr, location); | |
3502 | } | |
3503 | ||
76f85fd6 | 3504 | // Class Unary_expression. |
e440a328 | 3505 | |
3506 | // If we are taking the address of a composite literal, and the | |
2c809f8f | 3507 | // contents are not constant, then we want to make a heap expression |
e440a328 | 3508 | // instead. |
3509 | ||
3510 | Expression* | |
ceeb4318 | 3511 | Unary_expression::do_lower(Gogo*, Named_object*, Statement_inserter*, int) |
e440a328 | 3512 | { |
b13c66cd | 3513 | Location loc = this->location(); |
e440a328 | 3514 | Operator op = this->op_; |
3515 | Expression* expr = this->expr_; | |
3516 | ||
3517 | if (op == OPERATOR_MULT && expr->is_type_expression()) | |
3518 | return Expression::make_type(Type::make_pointer_type(expr->type()), loc); | |
3519 | ||
3520 | // *&x simplifies to x. *(*T)(unsafe.Pointer)(&x) does not require | |
3521 | // moving x to the heap. FIXME: Is it worth doing a real escape | |
3522 | // analysis here? This case is found in math/unsafe.go and is | |
3523 | // therefore worth special casing. | |
3524 | if (op == OPERATOR_MULT) | |
3525 | { | |
3526 | Expression* e = expr; | |
3527 | while (e->classification() == EXPRESSION_CONVERSION) | |
3528 | { | |
3529 | Type_conversion_expression* te | |
3530 | = static_cast<Type_conversion_expression*>(e); | |
3531 | e = te->expr(); | |
3532 | } | |
3533 | ||
3534 | if (e->classification() == EXPRESSION_UNARY) | |
3535 | { | |
3536 | Unary_expression* ue = static_cast<Unary_expression*>(e); | |
3537 | if (ue->op_ == OPERATOR_AND) | |
3538 | { | |
3539 | if (e == expr) | |
3540 | { | |
3541 | // *&x == x. | |
f4dea966 | 3542 | if (!ue->expr_->is_addressable() && !ue->create_temp_) |
3543 | { | |
3544 | error_at(ue->location(), | |
3545 | "invalid operand for unary %<&%>"); | |
3546 | this->set_is_error(); | |
3547 | } | |
e440a328 | 3548 | return ue->expr_; |
3549 | } | |
3550 | ue->set_does_not_escape(); | |
3551 | } | |
3552 | } | |
3553 | } | |
3554 | ||
55661ce9 | 3555 | // Catching an invalid indirection of unsafe.Pointer here avoid |
3556 | // having to deal with TYPE_VOID in other places. | |
3557 | if (op == OPERATOR_MULT && expr->type()->is_unsafe_pointer_type()) | |
3558 | { | |
3559 | error_at(this->location(), "invalid indirect of %<unsafe.Pointer%>"); | |
3560 | return Expression::make_error(this->location()); | |
3561 | } | |
3562 | ||
d9f3743a | 3563 | // Check for an invalid pointer dereference. We need to do this |
3564 | // here because Unary_expression::do_type will return an error type | |
3565 | // in this case. That can cause code to appear erroneous, and | |
3566 | // therefore disappear at lowering time, without any error message. | |
3567 | if (op == OPERATOR_MULT && expr->type()->points_to() == NULL) | |
3568 | { | |
3569 | this->report_error(_("expected pointer")); | |
3570 | return Expression::make_error(this->location()); | |
3571 | } | |
3572 | ||
59a401fe | 3573 | if (op == OPERATOR_PLUS || op == OPERATOR_MINUS || op == OPERATOR_XOR) |
e440a328 | 3574 | { |
0c77715b | 3575 | Numeric_constant nc; |
3576 | if (expr->numeric_constant_value(&nc)) | |
e440a328 | 3577 | { |
0c77715b | 3578 | Numeric_constant result; |
3579 | if (Unary_expression::eval_constant(op, &nc, loc, &result)) | |
3580 | return result.expression(loc); | |
e440a328 | 3581 | } |
3582 | } | |
3583 | ||
3584 | return this; | |
3585 | } | |
3586 | ||
f9ca30f9 | 3587 | // Flatten expression if a nil check must be performed and create temporary |
3588 | // variables if necessary. | |
3589 | ||
3590 | Expression* | |
3591 | Unary_expression::do_flatten(Gogo* gogo, Named_object*, | |
3592 | Statement_inserter* inserter) | |
3593 | { | |
5bf8be8b | 3594 | if (this->is_error_expression() |
3595 | || this->expr_->is_error_expression() | |
3596 | || this->expr_->type()->is_error_type()) | |
3597 | { | |
3598 | go_assert(saw_errors()); | |
3599 | return Expression::make_error(this->location()); | |
3600 | } | |
f4dea966 | 3601 | |
f9ca30f9 | 3602 | Location location = this->location(); |
3603 | if (this->op_ == OPERATOR_MULT | |
3604 | && !this->expr_->is_variable()) | |
3605 | { | |
3606 | go_assert(this->expr_->type()->points_to() != NULL); | |
3607 | Type* ptype = this->expr_->type()->points_to(); | |
3608 | if (!ptype->is_void_type()) | |
3609 | { | |
3610 | Btype* pbtype = ptype->get_backend(gogo); | |
3f378015 | 3611 | int64_t s = gogo->backend()->type_size(pbtype); |
f9ca30f9 | 3612 | if (s >= 4096 || this->issue_nil_check_) |
3613 | { | |
3614 | Temporary_statement* temp = | |
3615 | Statement::make_temporary(NULL, this->expr_, location); | |
3616 | inserter->insert(temp); | |
3617 | this->expr_ = | |
3618 | Expression::make_temporary_reference(temp, location); | |
3619 | } | |
3620 | } | |
3621 | } | |
3622 | ||
da244e59 | 3623 | if (this->op_ == OPERATOR_AND) |
3624 | { | |
8ff995b5 | 3625 | // If this->escapes_ is false at this point, then it was set to |
3626 | // false by an explicit call to set_does_not_escape, and the | |
3627 | // value does not escape. If this->escapes_ is true, we may be | |
3628 | // able to set it to false if taking the address of a variable | |
3629 | // that does not escape. | |
3630 | if (this->escapes_ && this->expr_->var_expression() != NULL) | |
da244e59 | 3631 | { |
3632 | Named_object* var = this->expr_->var_expression()->named_object(); | |
3633 | if (var->is_variable()) | |
3634 | this->escapes_ = var->var_value()->escapes(); | |
3635 | if (var->is_result_variable()) | |
3636 | this->escapes_ = var->result_var_value()->escapes(); | |
3637 | } | |
3638 | this->expr_->address_taken(this->escapes_); | |
3639 | } | |
3640 | ||
f9ca30f9 | 3641 | if (this->create_temp_ && !this->expr_->is_variable()) |
3642 | { | |
3643 | Temporary_statement* temp = | |
3644 | Statement::make_temporary(NULL, this->expr_, location); | |
3645 | inserter->insert(temp); | |
3646 | this->expr_ = Expression::make_temporary_reference(temp, location); | |
3647 | } | |
3648 | ||
3649 | return this; | |
3650 | } | |
3651 | ||
e440a328 | 3652 | // Return whether a unary expression is a constant. |
3653 | ||
3654 | bool | |
3655 | Unary_expression::do_is_constant() const | |
3656 | { | |
3657 | if (this->op_ == OPERATOR_MULT) | |
3658 | { | |
3659 | // Indirecting through a pointer is only constant if the object | |
3660 | // to which the expression points is constant, but we currently | |
3661 | // have no way to determine that. | |
3662 | return false; | |
3663 | } | |
3664 | else if (this->op_ == OPERATOR_AND) | |
3665 | { | |
3666 | // Taking the address of a variable is constant if it is a | |
f9ca30f9 | 3667 | // global variable, not constant otherwise. In other cases taking the |
3668 | // address is probably not a constant. | |
e440a328 | 3669 | Var_expression* ve = this->expr_->var_expression(); |
3670 | if (ve != NULL) | |
3671 | { | |
3672 | Named_object* no = ve->named_object(); | |
3673 | return no->is_variable() && no->var_value()->is_global(); | |
3674 | } | |
3675 | return false; | |
3676 | } | |
3677 | else | |
3678 | return this->expr_->is_constant(); | |
3679 | } | |
3680 | ||
0c77715b | 3681 | // Apply unary opcode OP to UNC, setting NC. Return true if this |
3682 | // could be done, false if not. Issue errors for overflow. | |
e440a328 | 3683 | |
3684 | bool | |
0c77715b | 3685 | Unary_expression::eval_constant(Operator op, const Numeric_constant* unc, |
3686 | Location location, Numeric_constant* nc) | |
e440a328 | 3687 | { |
3688 | switch (op) | |
3689 | { | |
3690 | case OPERATOR_PLUS: | |
0c77715b | 3691 | *nc = *unc; |
e440a328 | 3692 | return true; |
0c77715b | 3693 | |
e440a328 | 3694 | case OPERATOR_MINUS: |
0c77715b | 3695 | if (unc->is_int() || unc->is_rune()) |
3696 | break; | |
3697 | else if (unc->is_float()) | |
3698 | { | |
3699 | mpfr_t uval; | |
3700 | unc->get_float(&uval); | |
3701 | mpfr_t val; | |
3702 | mpfr_init(val); | |
3703 | mpfr_neg(val, uval, GMP_RNDN); | |
3704 | nc->set_float(unc->type(), val); | |
3705 | mpfr_clear(uval); | |
3706 | mpfr_clear(val); | |
3707 | return true; | |
3708 | } | |
3709 | else if (unc->is_complex()) | |
3710 | { | |
fcbea5e4 | 3711 | mpc_t uval; |
3712 | unc->get_complex(&uval); | |
3713 | mpc_t val; | |
3714 | mpc_init2(val, mpc_precision); | |
3715 | mpc_neg(val, uval, MPC_RNDNN); | |
3716 | nc->set_complex(unc->type(), val); | |
3717 | mpc_clear(uval); | |
3718 | mpc_clear(val); | |
0c77715b | 3719 | return true; |
3720 | } | |
e440a328 | 3721 | else |
0c77715b | 3722 | go_unreachable(); |
e440a328 | 3723 | |
0c77715b | 3724 | case OPERATOR_XOR: |
3725 | break; | |
68448d53 | 3726 | |
59a401fe | 3727 | case OPERATOR_NOT: |
e440a328 | 3728 | case OPERATOR_AND: |
3729 | case OPERATOR_MULT: | |
3730 | return false; | |
0c77715b | 3731 | |
e440a328 | 3732 | default: |
c3e6f413 | 3733 | go_unreachable(); |
e440a328 | 3734 | } |
e440a328 | 3735 | |
0c77715b | 3736 | if (!unc->is_int() && !unc->is_rune()) |
3737 | return false; | |
3738 | ||
3739 | mpz_t uval; | |
8387e1df | 3740 | if (unc->is_rune()) |
3741 | unc->get_rune(&uval); | |
3742 | else | |
3743 | unc->get_int(&uval); | |
0c77715b | 3744 | mpz_t val; |
3745 | mpz_init(val); | |
e440a328 | 3746 | |
e440a328 | 3747 | switch (op) |
3748 | { | |
e440a328 | 3749 | case OPERATOR_MINUS: |
0c77715b | 3750 | mpz_neg(val, uval); |
3751 | break; | |
3752 | ||
e440a328 | 3753 | case OPERATOR_NOT: |
0c77715b | 3754 | mpz_set_ui(val, mpz_cmp_si(uval, 0) == 0 ? 1 : 0); |
3755 | break; | |
3756 | ||
e440a328 | 3757 | case OPERATOR_XOR: |
0c77715b | 3758 | { |
3759 | Type* utype = unc->type(); | |
3760 | if (utype->integer_type() == NULL | |
3761 | || utype->integer_type()->is_abstract()) | |
3762 | mpz_com(val, uval); | |
3763 | else | |
3764 | { | |
3765 | // The number of HOST_WIDE_INTs that it takes to represent | |
3766 | // UVAL. | |
3767 | size_t count = ((mpz_sizeinbase(uval, 2) | |
3768 | + HOST_BITS_PER_WIDE_INT | |
3769 | - 1) | |
3770 | / HOST_BITS_PER_WIDE_INT); | |
e440a328 | 3771 | |
0c77715b | 3772 | unsigned HOST_WIDE_INT* phwi = new unsigned HOST_WIDE_INT[count]; |
3773 | memset(phwi, 0, count * sizeof(HOST_WIDE_INT)); | |
3774 | ||
3775 | size_t obits = utype->integer_type()->bits(); | |
3776 | ||
3777 | if (!utype->integer_type()->is_unsigned() && mpz_sgn(uval) < 0) | |
3778 | { | |
3779 | mpz_t adj; | |
3780 | mpz_init_set_ui(adj, 1); | |
3781 | mpz_mul_2exp(adj, adj, obits); | |
3782 | mpz_add(uval, uval, adj); | |
3783 | mpz_clear(adj); | |
3784 | } | |
3785 | ||
3786 | size_t ecount; | |
3787 | mpz_export(phwi, &ecount, -1, sizeof(HOST_WIDE_INT), 0, 0, uval); | |
3788 | go_assert(ecount <= count); | |
3789 | ||
3790 | // Trim down to the number of words required by the type. | |
3791 | size_t ocount = ((obits + HOST_BITS_PER_WIDE_INT - 1) | |
3792 | / HOST_BITS_PER_WIDE_INT); | |
3793 | go_assert(ocount <= count); | |
3794 | ||
3795 | for (size_t i = 0; i < ocount; ++i) | |
3796 | phwi[i] = ~phwi[i]; | |
3797 | ||
3798 | size_t clearbits = ocount * HOST_BITS_PER_WIDE_INT - obits; | |
3799 | if (clearbits != 0) | |
3800 | phwi[ocount - 1] &= (((unsigned HOST_WIDE_INT) (HOST_WIDE_INT) -1) | |
3801 | >> clearbits); | |
3802 | ||
3803 | mpz_import(val, ocount, -1, sizeof(HOST_WIDE_INT), 0, 0, phwi); | |
3804 | ||
3805 | if (!utype->integer_type()->is_unsigned() | |
3806 | && mpz_tstbit(val, obits - 1)) | |
3807 | { | |
3808 | mpz_t adj; | |
3809 | mpz_init_set_ui(adj, 1); | |
3810 | mpz_mul_2exp(adj, adj, obits); | |
3811 | mpz_sub(val, val, adj); | |
3812 | mpz_clear(adj); | |
3813 | } | |
3814 | ||
3815 | delete[] phwi; | |
3816 | } | |
3817 | } | |
3818 | break; | |
e440a328 | 3819 | |
e440a328 | 3820 | default: |
c3e6f413 | 3821 | go_unreachable(); |
e440a328 | 3822 | } |
e440a328 | 3823 | |
0c77715b | 3824 | if (unc->is_rune()) |
3825 | nc->set_rune(NULL, val); | |
e440a328 | 3826 | else |
0c77715b | 3827 | nc->set_int(NULL, val); |
e440a328 | 3828 | |
0c77715b | 3829 | mpz_clear(uval); |
3830 | mpz_clear(val); | |
e440a328 | 3831 | |
0c77715b | 3832 | return nc->set_type(unc->type(), true, location); |
e440a328 | 3833 | } |
3834 | ||
0c77715b | 3835 | // Return the integral constant value of a unary expression, if it has one. |
e440a328 | 3836 | |
3837 | bool | |
0c77715b | 3838 | Unary_expression::do_numeric_constant_value(Numeric_constant* nc) const |
e440a328 | 3839 | { |
0c77715b | 3840 | Numeric_constant unc; |
3841 | if (!this->expr_->numeric_constant_value(&unc)) | |
3842 | return false; | |
3843 | return Unary_expression::eval_constant(this->op_, &unc, this->location(), | |
3844 | nc); | |
e440a328 | 3845 | } |
3846 | ||
3847 | // Return the type of a unary expression. | |
3848 | ||
3849 | Type* | |
3850 | Unary_expression::do_type() | |
3851 | { | |
3852 | switch (this->op_) | |
3853 | { | |
3854 | case OPERATOR_PLUS: | |
3855 | case OPERATOR_MINUS: | |
3856 | case OPERATOR_NOT: | |
3857 | case OPERATOR_XOR: | |
3858 | return this->expr_->type(); | |
3859 | ||
3860 | case OPERATOR_AND: | |
3861 | return Type::make_pointer_type(this->expr_->type()); | |
3862 | ||
3863 | case OPERATOR_MULT: | |
3864 | { | |
3865 | Type* subtype = this->expr_->type(); | |
3866 | Type* points_to = subtype->points_to(); | |
3867 | if (points_to == NULL) | |
3868 | return Type::make_error_type(); | |
3869 | return points_to; | |
3870 | } | |
3871 | ||
3872 | default: | |
c3e6f413 | 3873 | go_unreachable(); |
e440a328 | 3874 | } |
3875 | } | |
3876 | ||
3877 | // Determine abstract types for a unary expression. | |
3878 | ||
3879 | void | |
3880 | Unary_expression::do_determine_type(const Type_context* context) | |
3881 | { | |
3882 | switch (this->op_) | |
3883 | { | |
3884 | case OPERATOR_PLUS: | |
3885 | case OPERATOR_MINUS: | |
3886 | case OPERATOR_NOT: | |
3887 | case OPERATOR_XOR: | |
3888 | this->expr_->determine_type(context); | |
3889 | break; | |
3890 | ||
3891 | case OPERATOR_AND: | |
3892 | // Taking the address of something. | |
3893 | { | |
3894 | Type* subtype = (context->type == NULL | |
3895 | ? NULL | |
3896 | : context->type->points_to()); | |
3897 | Type_context subcontext(subtype, false); | |
3898 | this->expr_->determine_type(&subcontext); | |
3899 | } | |
3900 | break; | |
3901 | ||
3902 | case OPERATOR_MULT: | |
3903 | // Indirecting through a pointer. | |
3904 | { | |
3905 | Type* subtype = (context->type == NULL | |
3906 | ? NULL | |
3907 | : Type::make_pointer_type(context->type)); | |
3908 | Type_context subcontext(subtype, false); | |
3909 | this->expr_->determine_type(&subcontext); | |
3910 | } | |
3911 | break; | |
3912 | ||
3913 | default: | |
c3e6f413 | 3914 | go_unreachable(); |
e440a328 | 3915 | } |
3916 | } | |
3917 | ||
3918 | // Check types for a unary expression. | |
3919 | ||
3920 | void | |
3921 | Unary_expression::do_check_types(Gogo*) | |
3922 | { | |
9fe897ef | 3923 | Type* type = this->expr_->type(); |
5c13bd80 | 3924 | if (type->is_error()) |
9fe897ef | 3925 | { |
3926 | this->set_is_error(); | |
3927 | return; | |
3928 | } | |
3929 | ||
e440a328 | 3930 | switch (this->op_) |
3931 | { | |
3932 | case OPERATOR_PLUS: | |
3933 | case OPERATOR_MINUS: | |
9fe897ef | 3934 | if (type->integer_type() == NULL |
3935 | && type->float_type() == NULL | |
3936 | && type->complex_type() == NULL) | |
3937 | this->report_error(_("expected numeric type")); | |
e440a328 | 3938 | break; |
3939 | ||
3940 | case OPERATOR_NOT: | |
59a401fe | 3941 | if (!type->is_boolean_type()) |
3942 | this->report_error(_("expected boolean type")); | |
3943 | break; | |
3944 | ||
e440a328 | 3945 | case OPERATOR_XOR: |
b3b1474e | 3946 | if (type->integer_type() == NULL) |
3947 | this->report_error(_("expected integer")); | |
e440a328 | 3948 | break; |
3949 | ||
3950 | case OPERATOR_AND: | |
3951 | if (!this->expr_->is_addressable()) | |
09ea332d | 3952 | { |
3953 | if (!this->create_temp_) | |
f4dea966 | 3954 | { |
3955 | error_at(this->location(), "invalid operand for unary %<&%>"); | |
3956 | this->set_is_error(); | |
3957 | } | |
09ea332d | 3958 | } |
e440a328 | 3959 | else |
da244e59 | 3960 | this->expr_->issue_nil_check(); |
e440a328 | 3961 | break; |
3962 | ||
3963 | case OPERATOR_MULT: | |
3964 | // Indirecting through a pointer. | |
9fe897ef | 3965 | if (type->points_to() == NULL) |
3966 | this->report_error(_("expected pointer")); | |
7661d702 | 3967 | if (type->points_to()->is_error()) |
3968 | this->set_is_error(); | |
e440a328 | 3969 | break; |
3970 | ||
3971 | default: | |
c3e6f413 | 3972 | go_unreachable(); |
e440a328 | 3973 | } |
3974 | } | |
3975 | ||
ea664253 | 3976 | // Get the backend representation for a unary expression. |
e440a328 | 3977 | |
ea664253 | 3978 | Bexpression* |
3979 | Unary_expression::do_get_backend(Translate_context* context) | |
e440a328 | 3980 | { |
1b1f2abf | 3981 | Gogo* gogo = context->gogo(); |
e9d3367e | 3982 | Location loc = this->location(); |
3983 | ||
3984 | // Taking the address of a set-and-use-temporary expression requires | |
3985 | // setting the temporary and then taking the address. | |
3986 | if (this->op_ == OPERATOR_AND) | |
3987 | { | |
3988 | Set_and_use_temporary_expression* sut = | |
3989 | this->expr_->set_and_use_temporary_expression(); | |
3990 | if (sut != NULL) | |
3991 | { | |
3992 | Temporary_statement* temp = sut->temporary(); | |
3993 | Bvariable* bvar = temp->get_backend_variable(context); | |
f9ca30f9 | 3994 | Bexpression* bvar_expr = gogo->backend()->var_expression(bvar, loc); |
ea664253 | 3995 | Bexpression* bval = sut->expression()->get_backend(context); |
f9ca30f9 | 3996 | |
3997 | Bstatement* bassign = | |
3998 | gogo->backend()->assignment_statement(bvar_expr, bval, loc); | |
3999 | Bexpression* bvar_addr = | |
4000 | gogo->backend()->address_expression(bvar_expr, loc); | |
ea664253 | 4001 | return gogo->backend()->compound_expression(bassign, bvar_addr, loc); |
e9d3367e | 4002 | } |
4003 | } | |
4004 | ||
f9ca30f9 | 4005 | Bexpression* ret; |
ea664253 | 4006 | Bexpression* bexpr = this->expr_->get_backend(context); |
f9ca30f9 | 4007 | Btype* btype = this->expr_->type()->get_backend(gogo); |
e440a328 | 4008 | switch (this->op_) |
4009 | { | |
4010 | case OPERATOR_PLUS: | |
f9ca30f9 | 4011 | ret = bexpr; |
4012 | break; | |
e440a328 | 4013 | |
4014 | case OPERATOR_MINUS: | |
f9ca30f9 | 4015 | ret = gogo->backend()->unary_expression(this->op_, bexpr, loc); |
4016 | ret = gogo->backend()->convert_expression(btype, ret, loc); | |
4017 | break; | |
e440a328 | 4018 | |
4019 | case OPERATOR_NOT: | |
e440a328 | 4020 | case OPERATOR_XOR: |
f9ca30f9 | 4021 | ret = gogo->backend()->unary_expression(this->op_, bexpr, loc); |
4022 | break; | |
e440a328 | 4023 | |
4024 | case OPERATOR_AND: | |
09ea332d | 4025 | if (!this->create_temp_) |
4026 | { | |
4027 | // We should not see a non-constant constructor here; cases | |
4028 | // where we would see one should have been moved onto the | |
4029 | // heap at parse time. Taking the address of a nonconstant | |
4030 | // constructor will not do what the programmer expects. | |
f9ca30f9 | 4031 | |
4032 | go_assert(!this->expr_->is_composite_literal() | |
4033 | || this->expr_->is_immutable()); | |
24060bf9 | 4034 | if (this->expr_->classification() == EXPRESSION_UNARY) |
4035 | { | |
4036 | Unary_expression* ue = | |
4037 | static_cast<Unary_expression*>(this->expr_); | |
4038 | go_assert(ue->op() != OPERATOR_AND); | |
4039 | } | |
09ea332d | 4040 | } |
e440a328 | 4041 | |
f23d7786 | 4042 | static unsigned int counter; |
4043 | char buf[100]; | |
4044 | if (this->is_gc_root_ || this->is_slice_init_) | |
76f85fd6 | 4045 | { |
f23d7786 | 4046 | bool copy_to_heap = false; |
4047 | if (this->is_gc_root_) | |
4048 | { | |
4049 | // Build a decl for a GC root variable. GC roots are mutable, so | |
4050 | // they cannot be represented as an immutable_struct in the | |
4051 | // backend. | |
4052 | static unsigned int root_counter; | |
4053 | snprintf(buf, sizeof buf, "gc%u", root_counter); | |
4054 | ++root_counter; | |
4055 | } | |
4056 | else | |
4057 | { | |
4058 | // Build a decl for a slice value initializer. An immutable slice | |
4059 | // value initializer may have to be copied to the heap if it | |
4060 | // contains pointers in a non-constant context. | |
4061 | snprintf(buf, sizeof buf, "C%u", counter); | |
4062 | ++counter; | |
4063 | ||
4064 | Array_type* at = this->expr_->type()->array_type(); | |
4065 | go_assert(at != NULL); | |
4066 | ||
4067 | // If we are not copying the value to the heap, we will only | |
4068 | // initialize the value once, so we can use this directly | |
4069 | // rather than copying it. In that case we can't make it | |
4070 | // read-only, because the program is permitted to change it. | |
4071 | copy_to_heap = (at->element_type()->has_pointer() | |
4072 | && !context->is_const()); | |
4073 | } | |
4074 | Bvariable* implicit = | |
aa5ae575 | 4075 | gogo->backend()->implicit_variable(buf, btype, true, copy_to_heap, |
5892f89f | 4076 | false, 0); |
aa5ae575 | 4077 | gogo->backend()->implicit_variable_set_init(implicit, buf, btype, |
4078 | true, copy_to_heap, false, | |
4079 | bexpr); | |
f23d7786 | 4080 | bexpr = gogo->backend()->var_expression(implicit, loc); |
76f85fd6 | 4081 | } |
4082 | else if ((this->expr_->is_composite_literal() | |
f9ca30f9 | 4083 | || this->expr_->string_expression() != NULL) |
4084 | && this->expr_->is_immutable()) | |
4085 | { | |
76f85fd6 | 4086 | // Build a decl for a constant constructor. |
f9ca30f9 | 4087 | snprintf(buf, sizeof buf, "C%u", counter); |
4088 | ++counter; | |
4089 | ||
4090 | Bvariable* decl = | |
4091 | gogo->backend()->immutable_struct(buf, true, false, btype, loc); | |
4092 | gogo->backend()->immutable_struct_set_init(decl, buf, true, false, | |
4093 | btype, loc, bexpr); | |
4094 | bexpr = gogo->backend()->var_expression(decl, loc); | |
4095 | } | |
09ea332d | 4096 | |
f9ca30f9 | 4097 | go_assert(!this->create_temp_ || this->expr_->is_variable()); |
4098 | ret = gogo->backend()->address_expression(bexpr, loc); | |
4099 | break; | |
e440a328 | 4100 | |
4101 | case OPERATOR_MULT: | |
4102 | { | |
f9ca30f9 | 4103 | go_assert(this->expr_->type()->points_to() != NULL); |
e440a328 | 4104 | |
4105 | // If we are dereferencing the pointer to a large struct, we | |
4106 | // need to check for nil. We don't bother to check for small | |
4107 | // structs because we expect the system to crash on a nil | |
56080003 | 4108 | // pointer dereference. However, if we know the address of this |
4109 | // expression is being taken, we must always check for nil. | |
f9ca30f9 | 4110 | |
4111 | Type* ptype = this->expr_->type()->points_to(); | |
4112 | Btype* pbtype = ptype->get_backend(gogo); | |
4113 | if (!ptype->is_void_type()) | |
e440a328 | 4114 | { |
3f378015 | 4115 | int64_t s = gogo->backend()->type_size(pbtype); |
f9ca30f9 | 4116 | if (s >= 4096 || this->issue_nil_check_) |
19b4f09b | 4117 | { |
f9ca30f9 | 4118 | go_assert(this->expr_->is_variable()); |
ea664253 | 4119 | Bexpression* nil = |
4120 | Expression::make_nil(loc)->get_backend(context); | |
f9ca30f9 | 4121 | Bexpression* compare = |
4122 | gogo->backend()->binary_expression(OPERATOR_EQEQ, bexpr, | |
4123 | nil, loc); | |
f9ca30f9 | 4124 | Bexpression* crash = |
ea664253 | 4125 | gogo->runtime_error(RUNTIME_ERROR_NIL_DEREFERENCE, |
4126 | loc)->get_backend(context); | |
f9ca30f9 | 4127 | bexpr = gogo->backend()->conditional_expression(btype, compare, |
4128 | crash, bexpr, | |
4129 | loc); | |
4130 | ||
19b4f09b | 4131 | } |
e440a328 | 4132 | } |
9b27b43c | 4133 | ret = gogo->backend()->indirect_expression(pbtype, bexpr, false, loc); |
e440a328 | 4134 | } |
f9ca30f9 | 4135 | break; |
e440a328 | 4136 | |
4137 | default: | |
c3e6f413 | 4138 | go_unreachable(); |
e440a328 | 4139 | } |
f9ca30f9 | 4140 | |
ea664253 | 4141 | return ret; |
e440a328 | 4142 | } |
4143 | ||
4144 | // Export a unary expression. | |
4145 | ||
4146 | void | |
4147 | Unary_expression::do_export(Export* exp) const | |
4148 | { | |
4149 | switch (this->op_) | |
4150 | { | |
4151 | case OPERATOR_PLUS: | |
4152 | exp->write_c_string("+ "); | |
4153 | break; | |
4154 | case OPERATOR_MINUS: | |
4155 | exp->write_c_string("- "); | |
4156 | break; | |
4157 | case OPERATOR_NOT: | |
4158 | exp->write_c_string("! "); | |
4159 | break; | |
4160 | case OPERATOR_XOR: | |
4161 | exp->write_c_string("^ "); | |
4162 | break; | |
4163 | case OPERATOR_AND: | |
4164 | case OPERATOR_MULT: | |
4165 | default: | |
c3e6f413 | 4166 | go_unreachable(); |
e440a328 | 4167 | } |
4168 | this->expr_->export_expression(exp); | |
4169 | } | |
4170 | ||
4171 | // Import a unary expression. | |
4172 | ||
4173 | Expression* | |
4174 | Unary_expression::do_import(Import* imp) | |
4175 | { | |
4176 | Operator op; | |
4177 | switch (imp->get_char()) | |
4178 | { | |
4179 | case '+': | |
4180 | op = OPERATOR_PLUS; | |
4181 | break; | |
4182 | case '-': | |
4183 | op = OPERATOR_MINUS; | |
4184 | break; | |
4185 | case '!': | |
4186 | op = OPERATOR_NOT; | |
4187 | break; | |
4188 | case '^': | |
4189 | op = OPERATOR_XOR; | |
4190 | break; | |
4191 | default: | |
c3e6f413 | 4192 | go_unreachable(); |
e440a328 | 4193 | } |
4194 | imp->require_c_string(" "); | |
4195 | Expression* expr = Expression::import_expression(imp); | |
4196 | return Expression::make_unary(op, expr, imp->location()); | |
4197 | } | |
4198 | ||
d751bb78 | 4199 | // Dump ast representation of an unary expression. |
4200 | ||
4201 | void | |
4202 | Unary_expression::do_dump_expression(Ast_dump_context* ast_dump_context) const | |
4203 | { | |
4204 | ast_dump_context->dump_operator(this->op_); | |
4205 | ast_dump_context->ostream() << "("; | |
4206 | ast_dump_context->dump_expression(this->expr_); | |
4207 | ast_dump_context->ostream() << ") "; | |
4208 | } | |
4209 | ||
e440a328 | 4210 | // Make a unary expression. |
4211 | ||
4212 | Expression* | |
b13c66cd | 4213 | Expression::make_unary(Operator op, Expression* expr, Location location) |
e440a328 | 4214 | { |
4215 | return new Unary_expression(op, expr, location); | |
4216 | } | |
4217 | ||
4218 | // If this is an indirection through a pointer, return the expression | |
4219 | // being pointed through. Otherwise return this. | |
4220 | ||
4221 | Expression* | |
4222 | Expression::deref() | |
4223 | { | |
4224 | if (this->classification_ == EXPRESSION_UNARY) | |
4225 | { | |
4226 | Unary_expression* ue = static_cast<Unary_expression*>(this); | |
4227 | if (ue->op() == OPERATOR_MULT) | |
4228 | return ue->operand(); | |
4229 | } | |
4230 | return this; | |
4231 | } | |
4232 | ||
4233 | // Class Binary_expression. | |
4234 | ||
4235 | // Traversal. | |
4236 | ||
4237 | int | |
4238 | Binary_expression::do_traverse(Traverse* traverse) | |
4239 | { | |
4240 | int t = Expression::traverse(&this->left_, traverse); | |
4241 | if (t == TRAVERSE_EXIT) | |
4242 | return TRAVERSE_EXIT; | |
4243 | return Expression::traverse(&this->right_, traverse); | |
4244 | } | |
4245 | ||
0c77715b | 4246 | // Return the type to use for a binary operation on operands of |
4247 | // LEFT_TYPE and RIGHT_TYPE. These are the types of constants and as | |
4248 | // such may be NULL or abstract. | |
4249 | ||
4250 | bool | |
4251 | Binary_expression::operation_type(Operator op, Type* left_type, | |
4252 | Type* right_type, Type** result_type) | |
4253 | { | |
4254 | if (left_type != right_type | |
4255 | && !left_type->is_abstract() | |
4256 | && !right_type->is_abstract() | |
4257 | && left_type->base() != right_type->base() | |
4258 | && op != OPERATOR_LSHIFT | |
4259 | && op != OPERATOR_RSHIFT) | |
4260 | { | |
4261 | // May be a type error--let it be diagnosed elsewhere. | |
4262 | return false; | |
4263 | } | |
4264 | ||
4265 | if (op == OPERATOR_LSHIFT || op == OPERATOR_RSHIFT) | |
4266 | { | |
4267 | if (left_type->integer_type() != NULL) | |
4268 | *result_type = left_type; | |
4269 | else | |
4270 | *result_type = Type::make_abstract_integer_type(); | |
4271 | } | |
4272 | else if (!left_type->is_abstract() && left_type->named_type() != NULL) | |
4273 | *result_type = left_type; | |
4274 | else if (!right_type->is_abstract() && right_type->named_type() != NULL) | |
4275 | *result_type = right_type; | |
4276 | else if (!left_type->is_abstract()) | |
4277 | *result_type = left_type; | |
4278 | else if (!right_type->is_abstract()) | |
4279 | *result_type = right_type; | |
4280 | else if (left_type->complex_type() != NULL) | |
4281 | *result_type = left_type; | |
4282 | else if (right_type->complex_type() != NULL) | |
4283 | *result_type = right_type; | |
4284 | else if (left_type->float_type() != NULL) | |
4285 | *result_type = left_type; | |
4286 | else if (right_type->float_type() != NULL) | |
4287 | *result_type = right_type; | |
4288 | else if (left_type->integer_type() != NULL | |
4289 | && left_type->integer_type()->is_rune()) | |
4290 | *result_type = left_type; | |
4291 | else if (right_type->integer_type() != NULL | |
4292 | && right_type->integer_type()->is_rune()) | |
4293 | *result_type = right_type; | |
4294 | else | |
4295 | *result_type = left_type; | |
4296 | ||
4297 | return true; | |
4298 | } | |
4299 | ||
4300 | // Convert an integer comparison code and an operator to a boolean | |
4301 | // value. | |
e440a328 | 4302 | |
4303 | bool | |
0c77715b | 4304 | Binary_expression::cmp_to_bool(Operator op, int cmp) |
e440a328 | 4305 | { |
e440a328 | 4306 | switch (op) |
4307 | { | |
4308 | case OPERATOR_EQEQ: | |
0c77715b | 4309 | return cmp == 0; |
4310 | break; | |
e440a328 | 4311 | case OPERATOR_NOTEQ: |
0c77715b | 4312 | return cmp != 0; |
4313 | break; | |
e440a328 | 4314 | case OPERATOR_LT: |
0c77715b | 4315 | return cmp < 0; |
4316 | break; | |
e440a328 | 4317 | case OPERATOR_LE: |
0c77715b | 4318 | return cmp <= 0; |
e440a328 | 4319 | case OPERATOR_GT: |
0c77715b | 4320 | return cmp > 0; |
e440a328 | 4321 | case OPERATOR_GE: |
0c77715b | 4322 | return cmp >= 0; |
e440a328 | 4323 | default: |
c3e6f413 | 4324 | go_unreachable(); |
e440a328 | 4325 | } |
4326 | } | |
4327 | ||
0c77715b | 4328 | // Compare constants according to OP. |
e440a328 | 4329 | |
4330 | bool | |
0c77715b | 4331 | Binary_expression::compare_constant(Operator op, Numeric_constant* left_nc, |
4332 | Numeric_constant* right_nc, | |
4333 | Location location, bool* result) | |
e440a328 | 4334 | { |
0c77715b | 4335 | Type* left_type = left_nc->type(); |
4336 | Type* right_type = right_nc->type(); | |
4337 | ||
4338 | Type* type; | |
4339 | if (!Binary_expression::operation_type(op, left_type, right_type, &type)) | |
4340 | return false; | |
4341 | ||
4342 | // When comparing an untyped operand to a typed operand, we are | |
4343 | // effectively coercing the untyped operand to the other operand's | |
4344 | // type, so make sure that is valid. | |
4345 | if (!left_nc->set_type(type, true, location) | |
4346 | || !right_nc->set_type(type, true, location)) | |
4347 | return false; | |
4348 | ||
4349 | bool ret; | |
4350 | int cmp; | |
4351 | if (type->complex_type() != NULL) | |
4352 | { | |
4353 | if (op != OPERATOR_EQEQ && op != OPERATOR_NOTEQ) | |
4354 | return false; | |
4355 | ret = Binary_expression::compare_complex(left_nc, right_nc, &cmp); | |
4356 | } | |
4357 | else if (type->float_type() != NULL) | |
4358 | ret = Binary_expression::compare_float(left_nc, right_nc, &cmp); | |
e440a328 | 4359 | else |
0c77715b | 4360 | ret = Binary_expression::compare_integer(left_nc, right_nc, &cmp); |
4361 | ||
4362 | if (ret) | |
4363 | *result = Binary_expression::cmp_to_bool(op, cmp); | |
4364 | ||
4365 | return ret; | |
4366 | } | |
4367 | ||
4368 | // Compare integer constants. | |
4369 | ||
4370 | bool | |
4371 | Binary_expression::compare_integer(const Numeric_constant* left_nc, | |
4372 | const Numeric_constant* right_nc, | |
4373 | int* cmp) | |
4374 | { | |
4375 | mpz_t left_val; | |
4376 | if (!left_nc->to_int(&left_val)) | |
4377 | return false; | |
4378 | mpz_t right_val; | |
4379 | if (!right_nc->to_int(&right_val)) | |
e440a328 | 4380 | { |
0c77715b | 4381 | mpz_clear(left_val); |
4382 | return false; | |
e440a328 | 4383 | } |
0c77715b | 4384 | |
4385 | *cmp = mpz_cmp(left_val, right_val); | |
4386 | ||
4387 | mpz_clear(left_val); | |
4388 | mpz_clear(right_val); | |
4389 | ||
4390 | return true; | |
4391 | } | |
4392 | ||
4393 | // Compare floating point constants. | |
4394 | ||
4395 | bool | |
4396 | Binary_expression::compare_float(const Numeric_constant* left_nc, | |
4397 | const Numeric_constant* right_nc, | |
4398 | int* cmp) | |
4399 | { | |
4400 | mpfr_t left_val; | |
4401 | if (!left_nc->to_float(&left_val)) | |
4402 | return false; | |
4403 | mpfr_t right_val; | |
4404 | if (!right_nc->to_float(&right_val)) | |
e440a328 | 4405 | { |
0c77715b | 4406 | mpfr_clear(left_val); |
4407 | return false; | |
4408 | } | |
4409 | ||
4410 | // We already coerced both operands to the same type. If that type | |
4411 | // is not an abstract type, we need to round the values accordingly. | |
4412 | Type* type = left_nc->type(); | |
4413 | if (!type->is_abstract() && type->float_type() != NULL) | |
4414 | { | |
4415 | int bits = type->float_type()->bits(); | |
4416 | mpfr_prec_round(left_val, bits, GMP_RNDN); | |
4417 | mpfr_prec_round(right_val, bits, GMP_RNDN); | |
e440a328 | 4418 | } |
0c77715b | 4419 | |
4420 | *cmp = mpfr_cmp(left_val, right_val); | |
4421 | ||
4422 | mpfr_clear(left_val); | |
4423 | mpfr_clear(right_val); | |
4424 | ||
4425 | return true; | |
e440a328 | 4426 | } |
4427 | ||
0c77715b | 4428 | // Compare complex constants. Complex numbers may only be compared |
4429 | // for equality. | |
e440a328 | 4430 | |
4431 | bool | |
0c77715b | 4432 | Binary_expression::compare_complex(const Numeric_constant* left_nc, |
4433 | const Numeric_constant* right_nc, | |
4434 | int* cmp) | |
e440a328 | 4435 | { |
fcbea5e4 | 4436 | mpc_t left_val; |
4437 | if (!left_nc->to_complex(&left_val)) | |
0c77715b | 4438 | return false; |
fcbea5e4 | 4439 | mpc_t right_val; |
4440 | if (!right_nc->to_complex(&right_val)) | |
e440a328 | 4441 | { |
fcbea5e4 | 4442 | mpc_clear(left_val); |
0c77715b | 4443 | return false; |
e440a328 | 4444 | } |
0c77715b | 4445 | |
4446 | // We already coerced both operands to the same type. If that type | |
4447 | // is not an abstract type, we need to round the values accordingly. | |
4448 | Type* type = left_nc->type(); | |
4449 | if (!type->is_abstract() && type->complex_type() != NULL) | |
e440a328 | 4450 | { |
0c77715b | 4451 | int bits = type->complex_type()->bits(); |
fcbea5e4 | 4452 | mpfr_prec_round(mpc_realref(left_val), bits / 2, GMP_RNDN); |
4453 | mpfr_prec_round(mpc_imagref(left_val), bits / 2, GMP_RNDN); | |
4454 | mpfr_prec_round(mpc_realref(right_val), bits / 2, GMP_RNDN); | |
4455 | mpfr_prec_round(mpc_imagref(right_val), bits / 2, GMP_RNDN); | |
e440a328 | 4456 | } |
0c77715b | 4457 | |
fcbea5e4 | 4458 | *cmp = mpc_cmp(left_val, right_val) != 0; |
0c77715b | 4459 | |
fcbea5e4 | 4460 | mpc_clear(left_val); |
4461 | mpc_clear(right_val); | |
0c77715b | 4462 | |
4463 | return true; | |
e440a328 | 4464 | } |
4465 | ||
0c77715b | 4466 | // Apply binary opcode OP to LEFT_NC and RIGHT_NC, setting NC. Return |
4467 | // true if this could be done, false if not. Issue errors at LOCATION | |
4468 | // as appropriate. | |
e440a328 | 4469 | |
4470 | bool | |
0c77715b | 4471 | Binary_expression::eval_constant(Operator op, Numeric_constant* left_nc, |
4472 | Numeric_constant* right_nc, | |
4473 | Location location, Numeric_constant* nc) | |
e440a328 | 4474 | { |
e440a328 | 4475 | switch (op) |
4476 | { | |
4477 | case OPERATOR_OROR: | |
4478 | case OPERATOR_ANDAND: | |
4479 | case OPERATOR_EQEQ: | |
4480 | case OPERATOR_NOTEQ: | |
4481 | case OPERATOR_LT: | |
4482 | case OPERATOR_LE: | |
4483 | case OPERATOR_GT: | |
4484 | case OPERATOR_GE: | |
9767e2d3 | 4485 | // These return boolean values, not numeric. |
4486 | return false; | |
0c77715b | 4487 | default: |
4488 | break; | |
4489 | } | |
4490 | ||
4491 | Type* left_type = left_nc->type(); | |
4492 | Type* right_type = right_nc->type(); | |
4493 | ||
4494 | Type* type; | |
4495 | if (!Binary_expression::operation_type(op, left_type, right_type, &type)) | |
4496 | return false; | |
4497 | ||
4498 | bool is_shift = op == OPERATOR_LSHIFT || op == OPERATOR_RSHIFT; | |
4499 | ||
4500 | // When combining an untyped operand with a typed operand, we are | |
4501 | // effectively coercing the untyped operand to the other operand's | |
4502 | // type, so make sure that is valid. | |
4503 | if (!left_nc->set_type(type, true, location)) | |
4504 | return false; | |
4505 | if (!is_shift && !right_nc->set_type(type, true, location)) | |
4506 | return false; | |
4507 | ||
4508 | bool r; | |
4509 | if (type->complex_type() != NULL) | |
4510 | r = Binary_expression::eval_complex(op, left_nc, right_nc, location, nc); | |
4511 | else if (type->float_type() != NULL) | |
4512 | r = Binary_expression::eval_float(op, left_nc, right_nc, location, nc); | |
4513 | else | |
4514 | r = Binary_expression::eval_integer(op, left_nc, right_nc, location, nc); | |
4515 | ||
4516 | if (r) | |
4517 | r = nc->set_type(type, true, location); | |
4518 | ||
4519 | return r; | |
4520 | } | |
4521 | ||
4522 | // Apply binary opcode OP to LEFT_NC and RIGHT_NC, setting NC, using | |
4523 | // integer operations. Return true if this could be done, false if | |
4524 | // not. | |
4525 | ||
4526 | bool | |
4527 | Binary_expression::eval_integer(Operator op, const Numeric_constant* left_nc, | |
4528 | const Numeric_constant* right_nc, | |
4529 | Location location, Numeric_constant* nc) | |
4530 | { | |
4531 | mpz_t left_val; | |
4532 | if (!left_nc->to_int(&left_val)) | |
4533 | return false; | |
4534 | mpz_t right_val; | |
4535 | if (!right_nc->to_int(&right_val)) | |
4536 | { | |
4537 | mpz_clear(left_val); | |
e440a328 | 4538 | return false; |
0c77715b | 4539 | } |
4540 | ||
4541 | mpz_t val; | |
4542 | mpz_init(val); | |
4543 | ||
4544 | switch (op) | |
4545 | { | |
e440a328 | 4546 | case OPERATOR_PLUS: |
4547 | mpz_add(val, left_val, right_val); | |
2c809f8f | 4548 | if (mpz_sizeinbase(val, 2) > 0x100000) |
4549 | { | |
4550 | error_at(location, "constant addition overflow"); | |
4551 | mpz_set_ui(val, 1); | |
4552 | } | |
e440a328 | 4553 | break; |
4554 | case OPERATOR_MINUS: | |
4555 | mpz_sub(val, left_val, right_val); | |
2c809f8f | 4556 | if (mpz_sizeinbase(val, 2) > 0x100000) |
4557 | { | |
4558 | error_at(location, "constant subtraction overflow"); | |
4559 | mpz_set_ui(val, 1); | |
4560 | } | |
e440a328 | 4561 | break; |
4562 | case OPERATOR_OR: | |
4563 | mpz_ior(val, left_val, right_val); | |
4564 | break; | |
4565 | case OPERATOR_XOR: | |
4566 | mpz_xor(val, left_val, right_val); | |
4567 | break; | |
4568 | case OPERATOR_MULT: | |
4569 | mpz_mul(val, left_val, right_val); | |
2c809f8f | 4570 | if (mpz_sizeinbase(val, 2) > 0x100000) |
4571 | { | |
4572 | error_at(location, "constant multiplication overflow"); | |
4573 | mpz_set_ui(val, 1); | |
4574 | } | |
e440a328 | 4575 | break; |
4576 | case OPERATOR_DIV: | |
4577 | if (mpz_sgn(right_val) != 0) | |
4578 | mpz_tdiv_q(val, left_val, right_val); | |
4579 | else | |
4580 | { | |
4581 | error_at(location, "division by zero"); | |
4582 | mpz_set_ui(val, 0); | |
e440a328 | 4583 | } |
4584 | break; | |
4585 | case OPERATOR_MOD: | |
4586 | if (mpz_sgn(right_val) != 0) | |
4587 | mpz_tdiv_r(val, left_val, right_val); | |
4588 | else | |
4589 | { | |
4590 | error_at(location, "division by zero"); | |
4591 | mpz_set_ui(val, 0); | |
e440a328 | 4592 | } |
4593 | break; | |
4594 | case OPERATOR_LSHIFT: | |
4595 | { | |
4596 | unsigned long shift = mpz_get_ui(right_val); | |
0c77715b | 4597 | if (mpz_cmp_ui(right_val, shift) == 0 && shift <= 0x100000) |
4598 | mpz_mul_2exp(val, left_val, shift); | |
4599 | else | |
e440a328 | 4600 | { |
4601 | error_at(location, "shift count overflow"); | |
2c809f8f | 4602 | mpz_set_ui(val, 1); |
e440a328 | 4603 | } |
e440a328 | 4604 | break; |
4605 | } | |
4606 | break; | |
4607 | case OPERATOR_RSHIFT: | |
4608 | { | |
4609 | unsigned long shift = mpz_get_ui(right_val); | |
4610 | if (mpz_cmp_ui(right_val, shift) != 0) | |
4611 | { | |
4612 | error_at(location, "shift count overflow"); | |
2c809f8f | 4613 | mpz_set_ui(val, 1); |
e440a328 | 4614 | } |
e440a328 | 4615 | else |
0c77715b | 4616 | { |
4617 | if (mpz_cmp_ui(left_val, 0) >= 0) | |
4618 | mpz_tdiv_q_2exp(val, left_val, shift); | |
4619 | else | |
4620 | mpz_fdiv_q_2exp(val, left_val, shift); | |
4621 | } | |
e440a328 | 4622 | break; |
4623 | } | |
4624 | break; | |
4625 | case OPERATOR_AND: | |
4626 | mpz_and(val, left_val, right_val); | |
4627 | break; | |
4628 | case OPERATOR_BITCLEAR: | |
4629 | { | |
4630 | mpz_t tval; | |
4631 | mpz_init(tval); | |
4632 | mpz_com(tval, right_val); | |
4633 | mpz_and(val, left_val, tval); | |
4634 | mpz_clear(tval); | |
4635 | } | |
4636 | break; | |
4637 | default: | |
c3e6f413 | 4638 | go_unreachable(); |
e440a328 | 4639 | } |
4640 | ||
0c77715b | 4641 | mpz_clear(left_val); |
4642 | mpz_clear(right_val); | |
e440a328 | 4643 | |
0c77715b | 4644 | if (left_nc->is_rune() |
4645 | || (op != OPERATOR_LSHIFT | |
4646 | && op != OPERATOR_RSHIFT | |
4647 | && right_nc->is_rune())) | |
4648 | nc->set_rune(NULL, val); | |
4649 | else | |
4650 | nc->set_int(NULL, val); | |
4651 | ||
4652 | mpz_clear(val); | |
e440a328 | 4653 | |
4654 | return true; | |
4655 | } | |
4656 | ||
0c77715b | 4657 | // Apply binary opcode OP to LEFT_NC and RIGHT_NC, setting NC, using |
4658 | // floating point operations. Return true if this could be done, | |
4659 | // false if not. | |
e440a328 | 4660 | |
4661 | bool | |
0c77715b | 4662 | Binary_expression::eval_float(Operator op, const Numeric_constant* left_nc, |
4663 | const Numeric_constant* right_nc, | |
4664 | Location location, Numeric_constant* nc) | |
e440a328 | 4665 | { |
0c77715b | 4666 | mpfr_t left_val; |
4667 | if (!left_nc->to_float(&left_val)) | |
4668 | return false; | |
4669 | mpfr_t right_val; | |
4670 | if (!right_nc->to_float(&right_val)) | |
e440a328 | 4671 | { |
0c77715b | 4672 | mpfr_clear(left_val); |
e440a328 | 4673 | return false; |
0c77715b | 4674 | } |
4675 | ||
4676 | mpfr_t val; | |
4677 | mpfr_init(val); | |
4678 | ||
4679 | bool ret = true; | |
4680 | switch (op) | |
4681 | { | |
e440a328 | 4682 | case OPERATOR_PLUS: |
4683 | mpfr_add(val, left_val, right_val, GMP_RNDN); | |
4684 | break; | |
4685 | case OPERATOR_MINUS: | |
4686 | mpfr_sub(val, left_val, right_val, GMP_RNDN); | |
4687 | break; | |
4688 | case OPERATOR_OR: | |
4689 | case OPERATOR_XOR: | |
4690 | case OPERATOR_AND: | |
4691 | case OPERATOR_BITCLEAR: | |
0c77715b | 4692 | case OPERATOR_MOD: |
4693 | case OPERATOR_LSHIFT: | |
4694 | case OPERATOR_RSHIFT: | |
4695 | mpfr_set_ui(val, 0, GMP_RNDN); | |
4696 | ret = false; | |
4697 | break; | |
e440a328 | 4698 | case OPERATOR_MULT: |
4699 | mpfr_mul(val, left_val, right_val, GMP_RNDN); | |
4700 | break; | |
4701 | case OPERATOR_DIV: | |
0c77715b | 4702 | if (!mpfr_zero_p(right_val)) |
4703 | mpfr_div(val, left_val, right_val, GMP_RNDN); | |
4704 | else | |
4705 | { | |
4706 | error_at(location, "division by zero"); | |
4707 | mpfr_set_ui(val, 0, GMP_RNDN); | |
4708 | } | |
e440a328 | 4709 | break; |
e440a328 | 4710 | default: |
c3e6f413 | 4711 | go_unreachable(); |
e440a328 | 4712 | } |
4713 | ||
0c77715b | 4714 | mpfr_clear(left_val); |
4715 | mpfr_clear(right_val); | |
e440a328 | 4716 | |
0c77715b | 4717 | nc->set_float(NULL, val); |
4718 | mpfr_clear(val); | |
e440a328 | 4719 | |
0c77715b | 4720 | return ret; |
e440a328 | 4721 | } |
4722 | ||
0c77715b | 4723 | // Apply binary opcode OP to LEFT_NC and RIGHT_NC, setting NC, using |
4724 | // complex operations. Return true if this could be done, false if | |
4725 | // not. | |
e440a328 | 4726 | |
4727 | bool | |
0c77715b | 4728 | Binary_expression::eval_complex(Operator op, const Numeric_constant* left_nc, |
4729 | const Numeric_constant* right_nc, | |
4730 | Location location, Numeric_constant* nc) | |
e440a328 | 4731 | { |
fcbea5e4 | 4732 | mpc_t left_val; |
4733 | if (!left_nc->to_complex(&left_val)) | |
0c77715b | 4734 | return false; |
fcbea5e4 | 4735 | mpc_t right_val; |
4736 | if (!right_nc->to_complex(&right_val)) | |
e440a328 | 4737 | { |
fcbea5e4 | 4738 | mpc_clear(left_val); |
e440a328 | 4739 | return false; |
0c77715b | 4740 | } |
4741 | ||
fcbea5e4 | 4742 | mpc_t val; |
4743 | mpc_init2(val, mpc_precision); | |
0c77715b | 4744 | |
4745 | bool ret = true; | |
4746 | switch (op) | |
4747 | { | |
e440a328 | 4748 | case OPERATOR_PLUS: |
fcbea5e4 | 4749 | mpc_add(val, left_val, right_val, MPC_RNDNN); |
e440a328 | 4750 | break; |
4751 | case OPERATOR_MINUS: | |
fcbea5e4 | 4752 | mpc_sub(val, left_val, right_val, MPC_RNDNN); |
e440a328 | 4753 | break; |
4754 | case OPERATOR_OR: | |
4755 | case OPERATOR_XOR: | |
4756 | case OPERATOR_AND: | |
4757 | case OPERATOR_BITCLEAR: | |
0c77715b | 4758 | case OPERATOR_MOD: |
4759 | case OPERATOR_LSHIFT: | |
4760 | case OPERATOR_RSHIFT: | |
fcbea5e4 | 4761 | mpc_set_ui(val, 0, MPC_RNDNN); |
0c77715b | 4762 | ret = false; |
4763 | break; | |
e440a328 | 4764 | case OPERATOR_MULT: |
fcbea5e4 | 4765 | mpc_mul(val, left_val, right_val, MPC_RNDNN); |
e440a328 | 4766 | break; |
4767 | case OPERATOR_DIV: | |
fcbea5e4 | 4768 | if (mpc_cmp_si(right_val, 0) == 0) |
4769 | { | |
4770 | error_at(location, "division by zero"); | |
4771 | mpc_set_ui(val, 0, MPC_RNDNN); | |
4772 | break; | |
4773 | } | |
4774 | mpc_div(val, left_val, right_val, MPC_RNDNN); | |
e440a328 | 4775 | break; |
e440a328 | 4776 | default: |
c3e6f413 | 4777 | go_unreachable(); |
e440a328 | 4778 | } |
4779 | ||
fcbea5e4 | 4780 | mpc_clear(left_val); |
4781 | mpc_clear(right_val); | |
e440a328 | 4782 | |
fcbea5e4 | 4783 | nc->set_complex(NULL, val); |
4784 | mpc_clear(val); | |
e440a328 | 4785 | |
0c77715b | 4786 | return ret; |
e440a328 | 4787 | } |
4788 | ||
4789 | // Lower a binary expression. We have to evaluate constant | |
4790 | // expressions now, in order to implement Go's unlimited precision | |
4791 | // constants. | |
4792 | ||
4793 | Expression* | |
e9d3367e | 4794 | Binary_expression::do_lower(Gogo* gogo, Named_object*, |
4795 | Statement_inserter* inserter, int) | |
e440a328 | 4796 | { |
b13c66cd | 4797 | Location location = this->location(); |
e440a328 | 4798 | Operator op = this->op_; |
4799 | Expression* left = this->left_; | |
4800 | Expression* right = this->right_; | |
4801 | ||
4802 | const bool is_comparison = (op == OPERATOR_EQEQ | |
4803 | || op == OPERATOR_NOTEQ | |
4804 | || op == OPERATOR_LT | |
4805 | || op == OPERATOR_LE | |
4806 | || op == OPERATOR_GT | |
4807 | || op == OPERATOR_GE); | |
4808 | ||
0c77715b | 4809 | // Numeric constant expressions. |
e440a328 | 4810 | { |
0c77715b | 4811 | Numeric_constant left_nc; |
4812 | Numeric_constant right_nc; | |
4813 | if (left->numeric_constant_value(&left_nc) | |
4814 | && right->numeric_constant_value(&right_nc)) | |
e440a328 | 4815 | { |
0c77715b | 4816 | if (is_comparison) |
e440a328 | 4817 | { |
0c77715b | 4818 | bool result; |
4819 | if (!Binary_expression::compare_constant(op, &left_nc, | |
4820 | &right_nc, location, | |
4821 | &result)) | |
4822 | return this; | |
e90c9dfc | 4823 | return Expression::make_cast(Type::make_boolean_type(), |
0c77715b | 4824 | Expression::make_boolean(result, |
4825 | location), | |
4826 | location); | |
e440a328 | 4827 | } |
4828 | else | |
4829 | { | |
0c77715b | 4830 | Numeric_constant nc; |
4831 | if (!Binary_expression::eval_constant(op, &left_nc, &right_nc, | |
4832 | location, &nc)) | |
4833 | return this; | |
4834 | return nc.expression(location); | |
e440a328 | 4835 | } |
4836 | } | |
e440a328 | 4837 | } |
4838 | ||
4839 | // String constant expressions. | |
315fa98d | 4840 | if (left->type()->is_string_type() && right->type()->is_string_type()) |
e440a328 | 4841 | { |
4842 | std::string left_string; | |
4843 | std::string right_string; | |
4844 | if (left->string_constant_value(&left_string) | |
4845 | && right->string_constant_value(&right_string)) | |
315fa98d | 4846 | { |
4847 | if (op == OPERATOR_PLUS) | |
4848 | return Expression::make_string(left_string + right_string, | |
4849 | location); | |
4850 | else if (is_comparison) | |
4851 | { | |
4852 | int cmp = left_string.compare(right_string); | |
0c77715b | 4853 | bool r = Binary_expression::cmp_to_bool(op, cmp); |
e90c9dfc | 4854 | return Expression::make_boolean(r, location); |
b40dc774 | 4855 | } |
4856 | } | |
b40dc774 | 4857 | } |
4858 | ||
ceeb12d7 | 4859 | // Lower struct, array, and some interface comparisons. |
e9d3367e | 4860 | if (op == OPERATOR_EQEQ || op == OPERATOR_NOTEQ) |
4861 | { | |
b79832ca | 4862 | if (left->type()->struct_type() != NULL |
4863 | && right->type()->struct_type() != NULL) | |
e9d3367e | 4864 | return this->lower_struct_comparison(gogo, inserter); |
4865 | else if (left->type()->array_type() != NULL | |
b79832ca | 4866 | && !left->type()->is_slice_type() |
4867 | && right->type()->array_type() != NULL | |
4868 | && !right->type()->is_slice_type()) | |
e9d3367e | 4869 | return this->lower_array_comparison(gogo, inserter); |
ceeb12d7 | 4870 | else if ((left->type()->interface_type() != NULL |
4871 | && right->type()->interface_type() == NULL) | |
4872 | || (left->type()->interface_type() == NULL | |
4873 | && right->type()->interface_type() != NULL)) | |
4874 | return this->lower_interface_value_comparison(gogo, inserter); | |
e9d3367e | 4875 | } |
4876 | ||
e440a328 | 4877 | return this; |
4878 | } | |
4879 | ||
e9d3367e | 4880 | // Lower a struct comparison. |
4881 | ||
4882 | Expression* | |
4883 | Binary_expression::lower_struct_comparison(Gogo* gogo, | |
4884 | Statement_inserter* inserter) | |
4885 | { | |
4886 | Struct_type* st = this->left_->type()->struct_type(); | |
4887 | Struct_type* st2 = this->right_->type()->struct_type(); | |
4888 | if (st2 == NULL) | |
4889 | return this; | |
4890 | if (st != st2 && !Type::are_identical(st, st2, false, NULL)) | |
4891 | return this; | |
4892 | if (!Type::are_compatible_for_comparison(true, this->left_->type(), | |
4893 | this->right_->type(), NULL)) | |
4894 | return this; | |
4895 | ||
4896 | // See if we can compare using memcmp. As a heuristic, we use | |
4897 | // memcmp rather than field references and comparisons if there are | |
4898 | // more than two fields. | |
113ef6a5 | 4899 | if (st->compare_is_identity(gogo) && st->total_field_count() > 2) |
e9d3367e | 4900 | return this->lower_compare_to_memcmp(gogo, inserter); |
4901 | ||
4902 | Location loc = this->location(); | |
4903 | ||
4904 | Expression* left = this->left_; | |
4905 | Temporary_statement* left_temp = NULL; | |
4906 | if (left->var_expression() == NULL | |
4907 | && left->temporary_reference_expression() == NULL) | |
4908 | { | |
4909 | left_temp = Statement::make_temporary(left->type(), NULL, loc); | |
4910 | inserter->insert(left_temp); | |
4911 | left = Expression::make_set_and_use_temporary(left_temp, left, loc); | |
4912 | } | |
4913 | ||
4914 | Expression* right = this->right_; | |
4915 | Temporary_statement* right_temp = NULL; | |
4916 | if (right->var_expression() == NULL | |
4917 | && right->temporary_reference_expression() == NULL) | |
4918 | { | |
4919 | right_temp = Statement::make_temporary(right->type(), NULL, loc); | |
4920 | inserter->insert(right_temp); | |
4921 | right = Expression::make_set_and_use_temporary(right_temp, right, loc); | |
4922 | } | |
4923 | ||
4924 | Expression* ret = Expression::make_boolean(true, loc); | |
4925 | const Struct_field_list* fields = st->fields(); | |
4926 | unsigned int field_index = 0; | |
4927 | for (Struct_field_list::const_iterator pf = fields->begin(); | |
4928 | pf != fields->end(); | |
4929 | ++pf, ++field_index) | |
4930 | { | |
f5165c05 | 4931 | if (Gogo::is_sink_name(pf->field_name())) |
4932 | continue; | |
4933 | ||
e9d3367e | 4934 | if (field_index > 0) |
4935 | { | |
4936 | if (left_temp == NULL) | |
4937 | left = left->copy(); | |
4938 | else | |
4939 | left = Expression::make_temporary_reference(left_temp, loc); | |
4940 | if (right_temp == NULL) | |
4941 | right = right->copy(); | |
4942 | else | |
4943 | right = Expression::make_temporary_reference(right_temp, loc); | |
4944 | } | |
4945 | Expression* f1 = Expression::make_field_reference(left, field_index, | |
4946 | loc); | |
4947 | Expression* f2 = Expression::make_field_reference(right, field_index, | |
4948 | loc); | |
4949 | Expression* cond = Expression::make_binary(OPERATOR_EQEQ, f1, f2, loc); | |
4950 | ret = Expression::make_binary(OPERATOR_ANDAND, ret, cond, loc); | |
4951 | } | |
4952 | ||
4953 | if (this->op_ == OPERATOR_NOTEQ) | |
4954 | ret = Expression::make_unary(OPERATOR_NOT, ret, loc); | |
4955 | ||
4956 | return ret; | |
4957 | } | |
4958 | ||
4959 | // Lower an array comparison. | |
4960 | ||
4961 | Expression* | |
4962 | Binary_expression::lower_array_comparison(Gogo* gogo, | |
4963 | Statement_inserter* inserter) | |
4964 | { | |
4965 | Array_type* at = this->left_->type()->array_type(); | |
4966 | Array_type* at2 = this->right_->type()->array_type(); | |
4967 | if (at2 == NULL) | |
4968 | return this; | |
4969 | if (at != at2 && !Type::are_identical(at, at2, false, NULL)) | |
4970 | return this; | |
4971 | if (!Type::are_compatible_for_comparison(true, this->left_->type(), | |
4972 | this->right_->type(), NULL)) | |
4973 | return this; | |
4974 | ||
4975 | // Call memcmp directly if possible. This may let the middle-end | |
4976 | // optimize the call. | |
113ef6a5 | 4977 | if (at->compare_is_identity(gogo)) |
e9d3367e | 4978 | return this->lower_compare_to_memcmp(gogo, inserter); |
4979 | ||
4980 | // Call the array comparison function. | |
4981 | Named_object* hash_fn; | |
4982 | Named_object* equal_fn; | |
4983 | at->type_functions(gogo, this->left_->type()->named_type(), NULL, NULL, | |
4984 | &hash_fn, &equal_fn); | |
4985 | ||
4986 | Location loc = this->location(); | |
4987 | ||
4988 | Expression* func = Expression::make_func_reference(equal_fn, NULL, loc); | |
4989 | ||
4990 | Expression_list* args = new Expression_list(); | |
4991 | args->push_back(this->operand_address(inserter, this->left_)); | |
4992 | args->push_back(this->operand_address(inserter, this->right_)); | |
4993 | args->push_back(Expression::make_type_info(at, TYPE_INFO_SIZE)); | |
4994 | ||
4995 | Expression* ret = Expression::make_call(func, args, false, loc); | |
4996 | ||
4997 | if (this->op_ == OPERATOR_NOTEQ) | |
4998 | ret = Expression::make_unary(OPERATOR_NOT, ret, loc); | |
4999 | ||
5000 | return ret; | |
5001 | } | |
5002 | ||
ceeb12d7 | 5003 | // Lower an interface to value comparison. |
5004 | ||
5005 | Expression* | |
5006 | Binary_expression::lower_interface_value_comparison(Gogo*, | |
5007 | Statement_inserter* inserter) | |
5008 | { | |
5009 | Type* left_type = this->left_->type(); | |
5010 | Type* right_type = this->right_->type(); | |
5011 | Interface_type* ift; | |
5012 | if (left_type->interface_type() != NULL) | |
5013 | { | |
5014 | ift = left_type->interface_type(); | |
5015 | if (!ift->implements_interface(right_type, NULL)) | |
5016 | return this; | |
5017 | } | |
5018 | else | |
5019 | { | |
5020 | ift = right_type->interface_type(); | |
5021 | if (!ift->implements_interface(left_type, NULL)) | |
5022 | return this; | |
5023 | } | |
5024 | if (!Type::are_compatible_for_comparison(true, left_type, right_type, NULL)) | |
5025 | return this; | |
5026 | ||
5027 | Location loc = this->location(); | |
5028 | ||
5029 | if (left_type->interface_type() == NULL | |
5030 | && left_type->points_to() == NULL | |
5031 | && !this->left_->is_addressable()) | |
5032 | { | |
5033 | Temporary_statement* temp = | |
5034 | Statement::make_temporary(left_type, NULL, loc); | |
5035 | inserter->insert(temp); | |
5036 | this->left_ = | |
5037 | Expression::make_set_and_use_temporary(temp, this->left_, loc); | |
5038 | } | |
5039 | ||
5040 | if (right_type->interface_type() == NULL | |
5041 | && right_type->points_to() == NULL | |
5042 | && !this->right_->is_addressable()) | |
5043 | { | |
5044 | Temporary_statement* temp = | |
5045 | Statement::make_temporary(right_type, NULL, loc); | |
5046 | inserter->insert(temp); | |
5047 | this->right_ = | |
5048 | Expression::make_set_and_use_temporary(temp, this->right_, loc); | |
5049 | } | |
5050 | ||
5051 | return this; | |
5052 | } | |
5053 | ||
e9d3367e | 5054 | // Lower a struct or array comparison to a call to memcmp. |
5055 | ||
5056 | Expression* | |
5057 | Binary_expression::lower_compare_to_memcmp(Gogo*, Statement_inserter* inserter) | |
5058 | { | |
5059 | Location loc = this->location(); | |
5060 | ||
5061 | Expression* a1 = this->operand_address(inserter, this->left_); | |
5062 | Expression* a2 = this->operand_address(inserter, this->right_); | |
5063 | Expression* len = Expression::make_type_info(this->left_->type(), | |
5064 | TYPE_INFO_SIZE); | |
5065 | ||
5066 | Expression* call = Runtime::make_call(Runtime::MEMCMP, loc, 3, a1, a2, len); | |
e67508fa | 5067 | Expression* zero = Expression::make_integer_ul(0, NULL, loc); |
e9d3367e | 5068 | return Expression::make_binary(this->op_, call, zero, loc); |
5069 | } | |
5070 | ||
a32698ee | 5071 | Expression* |
5c3f3470 | 5072 | Binary_expression::do_flatten(Gogo* gogo, Named_object*, |
a32698ee | 5073 | Statement_inserter* inserter) |
5074 | { | |
5075 | Location loc = this->location(); | |
5bf8be8b | 5076 | if (this->left_->type()->is_error_type() |
5077 | || this->right_->type()->is_error_type() | |
5078 | || this->left_->is_error_expression() | |
5079 | || this->right_->is_error_expression()) | |
5080 | { | |
5081 | go_assert(saw_errors()); | |
5082 | return Expression::make_error(loc); | |
5083 | } | |
5084 | ||
a32698ee | 5085 | Temporary_statement* temp; |
5086 | if (this->left_->type()->is_string_type() | |
5087 | && this->op_ == OPERATOR_PLUS) | |
5088 | { | |
0108f7b4 | 5089 | if (!this->left_->is_variable() |
5090 | && !this->left_->is_constant()) | |
a32698ee | 5091 | { |
5092 | temp = Statement::make_temporary(NULL, this->left_, loc); | |
5093 | inserter->insert(temp); | |
5094 | this->left_ = Expression::make_temporary_reference(temp, loc); | |
5095 | } | |
0108f7b4 | 5096 | if (!this->right_->is_variable() |
5097 | && !this->right_->is_constant()) | |
a32698ee | 5098 | { |
5099 | temp = | |
5100 | Statement::make_temporary(this->left_->type(), this->right_, loc); | |
5101 | this->right_ = Expression::make_temporary_reference(temp, loc); | |
5102 | inserter->insert(temp); | |
5103 | } | |
5104 | } | |
5105 | ||
5106 | Type* left_type = this->left_->type(); | |
5107 | bool is_shift_op = (this->op_ == OPERATOR_LSHIFT | |
5108 | || this->op_ == OPERATOR_RSHIFT); | |
5109 | bool is_idiv_op = ((this->op_ == OPERATOR_DIV && | |
5110 | left_type->integer_type() != NULL) | |
5111 | || this->op_ == OPERATOR_MOD); | |
5112 | ||
a32698ee | 5113 | if (is_shift_op |
5c3f3470 | 5114 | || (is_idiv_op |
5115 | && (gogo->check_divide_by_zero() || gogo->check_divide_overflow()))) | |
a32698ee | 5116 | { |
5117 | if (!this->left_->is_variable()) | |
5118 | { | |
5119 | temp = Statement::make_temporary(NULL, this->left_, loc); | |
5120 | inserter->insert(temp); | |
5121 | this->left_ = Expression::make_temporary_reference(temp, loc); | |
5122 | } | |
5123 | if (!this->right_->is_variable()) | |
5124 | { | |
5125 | temp = | |
5126 | Statement::make_temporary(NULL, this->right_, loc); | |
5127 | this->right_ = Expression::make_temporary_reference(temp, loc); | |
5128 | inserter->insert(temp); | |
5129 | } | |
5130 | } | |
5131 | return this; | |
5132 | } | |
5133 | ||
5134 | ||
e9d3367e | 5135 | // Return the address of EXPR, cast to unsafe.Pointer. |
5136 | ||
5137 | Expression* | |
5138 | Binary_expression::operand_address(Statement_inserter* inserter, | |
5139 | Expression* expr) | |
5140 | { | |
5141 | Location loc = this->location(); | |
5142 | ||
5143 | if (!expr->is_addressable()) | |
5144 | { | |
5145 | Temporary_statement* temp = Statement::make_temporary(expr->type(), NULL, | |
5146 | loc); | |
5147 | inserter->insert(temp); | |
5148 | expr = Expression::make_set_and_use_temporary(temp, expr, loc); | |
5149 | } | |
5150 | expr = Expression::make_unary(OPERATOR_AND, expr, loc); | |
5151 | static_cast<Unary_expression*>(expr)->set_does_not_escape(); | |
5152 | Type* void_type = Type::make_void_type(); | |
5153 | Type* unsafe_pointer_type = Type::make_pointer_type(void_type); | |
5154 | return Expression::make_cast(unsafe_pointer_type, expr, loc); | |
5155 | } | |
5156 | ||
0c77715b | 5157 | // Return the numeric constant value, if it has one. |
e440a328 | 5158 | |
5159 | bool | |
0c77715b | 5160 | Binary_expression::do_numeric_constant_value(Numeric_constant* nc) const |
e440a328 | 5161 | { |
0c77715b | 5162 | Numeric_constant left_nc; |
5163 | if (!this->left_->numeric_constant_value(&left_nc)) | |
5164 | return false; | |
5165 | Numeric_constant right_nc; | |
5166 | if (!this->right_->numeric_constant_value(&right_nc)) | |
5167 | return false; | |
9767e2d3 | 5168 | return Binary_expression::eval_constant(this->op_, &left_nc, &right_nc, |
0c77715b | 5169 | this->location(), nc); |
e440a328 | 5170 | } |
5171 | ||
5172 | // Note that the value is being discarded. | |
5173 | ||
4f2138d7 | 5174 | bool |
e440a328 | 5175 | Binary_expression::do_discarding_value() |
5176 | { | |
5177 | if (this->op_ == OPERATOR_OROR || this->op_ == OPERATOR_ANDAND) | |
4f2138d7 | 5178 | return this->right_->discarding_value(); |
e440a328 | 5179 | else |
4f2138d7 | 5180 | { |
5181 | this->unused_value_error(); | |
5182 | return false; | |
5183 | } | |
e440a328 | 5184 | } |
5185 | ||
5186 | // Get type. | |
5187 | ||
5188 | Type* | |
5189 | Binary_expression::do_type() | |
5190 | { | |
5f5fea79 | 5191 | if (this->classification() == EXPRESSION_ERROR) |
5192 | return Type::make_error_type(); | |
5193 | ||
e440a328 | 5194 | switch (this->op_) |
5195 | { | |
e440a328 | 5196 | case OPERATOR_EQEQ: |
5197 | case OPERATOR_NOTEQ: | |
5198 | case OPERATOR_LT: | |
5199 | case OPERATOR_LE: | |
5200 | case OPERATOR_GT: | |
5201 | case OPERATOR_GE: | |
e90c9dfc | 5202 | if (this->type_ == NULL) |
5203 | this->type_ = Type::make_boolean_type(); | |
5204 | return this->type_; | |
e440a328 | 5205 | |
5206 | case OPERATOR_PLUS: | |
5207 | case OPERATOR_MINUS: | |
5208 | case OPERATOR_OR: | |
5209 | case OPERATOR_XOR: | |
5210 | case OPERATOR_MULT: | |
5211 | case OPERATOR_DIV: | |
5212 | case OPERATOR_MOD: | |
5213 | case OPERATOR_AND: | |
5214 | case OPERATOR_BITCLEAR: | |
e90c9dfc | 5215 | case OPERATOR_OROR: |
5216 | case OPERATOR_ANDAND: | |
e440a328 | 5217 | { |
0c77715b | 5218 | Type* type; |
5219 | if (!Binary_expression::operation_type(this->op_, | |
5220 | this->left_->type(), | |
5221 | this->right_->type(), | |
5222 | &type)) | |
5223 | return Type::make_error_type(); | |
5224 | return type; | |
e440a328 | 5225 | } |
5226 | ||
5227 | case OPERATOR_LSHIFT: | |
5228 | case OPERATOR_RSHIFT: | |
5229 | return this->left_->type(); | |
5230 | ||
5231 | default: | |
c3e6f413 | 5232 | go_unreachable(); |
e440a328 | 5233 | } |
5234 | } | |
5235 | ||
5236 | // Set type for a binary expression. | |
5237 | ||
5238 | void | |
5239 | Binary_expression::do_determine_type(const Type_context* context) | |
5240 | { | |
5241 | Type* tleft = this->left_->type(); | |
5242 | Type* tright = this->right_->type(); | |
5243 | ||
5244 | // Both sides should have the same type, except for the shift | |
5245 | // operations. For a comparison, we should ignore the incoming | |
5246 | // type. | |
5247 | ||
5248 | bool is_shift_op = (this->op_ == OPERATOR_LSHIFT | |
5249 | || this->op_ == OPERATOR_RSHIFT); | |
5250 | ||
5251 | bool is_comparison = (this->op_ == OPERATOR_EQEQ | |
5252 | || this->op_ == OPERATOR_NOTEQ | |
5253 | || this->op_ == OPERATOR_LT | |
5254 | || this->op_ == OPERATOR_LE | |
5255 | || this->op_ == OPERATOR_GT | |
5256 | || this->op_ == OPERATOR_GE); | |
5257 | ||
5258 | Type_context subcontext(*context); | |
5259 | ||
5260 | if (is_comparison) | |
5261 | { | |
5262 | // In a comparison, the context does not determine the types of | |
5263 | // the operands. | |
5264 | subcontext.type = NULL; | |
5265 | } | |
5266 | ||
5267 | // Set the context for the left hand operand. | |
5268 | if (is_shift_op) | |
5269 | { | |
b40dc774 | 5270 | // The right hand operand of a shift plays no role in |
5271 | // determining the type of the left hand operand. | |
e440a328 | 5272 | } |
5273 | else if (!tleft->is_abstract()) | |
5274 | subcontext.type = tleft; | |
5275 | else if (!tright->is_abstract()) | |
5276 | subcontext.type = tright; | |
5277 | else if (subcontext.type == NULL) | |
5278 | { | |
5279 | if ((tleft->integer_type() != NULL && tright->integer_type() != NULL) | |
5280 | || (tleft->float_type() != NULL && tright->float_type() != NULL) | |
5281 | || (tleft->complex_type() != NULL && tright->complex_type() != NULL)) | |
5282 | { | |
5283 | // Both sides have an abstract integer, abstract float, or | |
5284 | // abstract complex type. Just let CONTEXT determine | |
5285 | // whether they may remain abstract or not. | |
5286 | } | |
5287 | else if (tleft->complex_type() != NULL) | |
5288 | subcontext.type = tleft; | |
5289 | else if (tright->complex_type() != NULL) | |
5290 | subcontext.type = tright; | |
5291 | else if (tleft->float_type() != NULL) | |
5292 | subcontext.type = tleft; | |
5293 | else if (tright->float_type() != NULL) | |
5294 | subcontext.type = tright; | |
5295 | else | |
5296 | subcontext.type = tleft; | |
f58a23ae | 5297 | |
5298 | if (subcontext.type != NULL && !context->may_be_abstract) | |
5299 | subcontext.type = subcontext.type->make_non_abstract_type(); | |
e440a328 | 5300 | } |
5301 | ||
5302 | this->left_->determine_type(&subcontext); | |
5303 | ||
e440a328 | 5304 | if (is_shift_op) |
5305 | { | |
b40dc774 | 5306 | // We may have inherited an unusable type for the shift operand. |
5307 | // Give a useful error if that happened. | |
5308 | if (tleft->is_abstract() | |
5309 | && subcontext.type != NULL | |
8ab6effb | 5310 | && !subcontext.may_be_abstract |
f6bc81e6 | 5311 | && subcontext.type->interface_type() == NULL |
8ab6effb | 5312 | && subcontext.type->integer_type() == NULL) |
b40dc774 | 5313 | this->report_error(("invalid context-determined non-integer type " |
8ab6effb | 5314 | "for left operand of shift")); |
b40dc774 | 5315 | |
5316 | // The context for the right hand operand is the same as for the | |
5317 | // left hand operand, except for a shift operator. | |
e440a328 | 5318 | subcontext.type = Type::lookup_integer_type("uint"); |
5319 | subcontext.may_be_abstract = false; | |
5320 | } | |
5321 | ||
5322 | this->right_->determine_type(&subcontext); | |
e90c9dfc | 5323 | |
5324 | if (is_comparison) | |
5325 | { | |
5326 | if (this->type_ != NULL && !this->type_->is_abstract()) | |
5327 | ; | |
5328 | else if (context->type != NULL && context->type->is_boolean_type()) | |
5329 | this->type_ = context->type; | |
5330 | else if (!context->may_be_abstract) | |
5331 | this->type_ = Type::lookup_bool_type(); | |
5332 | } | |
e440a328 | 5333 | } |
5334 | ||
5335 | // Report an error if the binary operator OP does not support TYPE. | |
be8b5eee | 5336 | // OTYPE is the type of the other operand. Return whether the |
5337 | // operation is OK. This should not be used for shift. | |
e440a328 | 5338 | |
5339 | bool | |
be8b5eee | 5340 | Binary_expression::check_operator_type(Operator op, Type* type, Type* otype, |
b13c66cd | 5341 | Location location) |
e440a328 | 5342 | { |
5343 | switch (op) | |
5344 | { | |
5345 | case OPERATOR_OROR: | |
5346 | case OPERATOR_ANDAND: | |
5347 | if (!type->is_boolean_type()) | |
5348 | { | |
5349 | error_at(location, "expected boolean type"); | |
5350 | return false; | |
5351 | } | |
5352 | break; | |
5353 | ||
5354 | case OPERATOR_EQEQ: | |
5355 | case OPERATOR_NOTEQ: | |
e9d3367e | 5356 | { |
5357 | std::string reason; | |
5358 | if (!Type::are_compatible_for_comparison(true, type, otype, &reason)) | |
5359 | { | |
5360 | error_at(location, "%s", reason.c_str()); | |
5361 | return false; | |
5362 | } | |
5363 | } | |
e440a328 | 5364 | break; |
5365 | ||
5366 | case OPERATOR_LT: | |
5367 | case OPERATOR_LE: | |
5368 | case OPERATOR_GT: | |
5369 | case OPERATOR_GE: | |
e9d3367e | 5370 | { |
5371 | std::string reason; | |
5372 | if (!Type::are_compatible_for_comparison(false, type, otype, &reason)) | |
5373 | { | |
5374 | error_at(location, "%s", reason.c_str()); | |
5375 | return false; | |
5376 | } | |
5377 | } | |
e440a328 | 5378 | break; |
5379 | ||
5380 | case OPERATOR_PLUS: | |
5381 | case OPERATOR_PLUSEQ: | |
5382 | if (type->integer_type() == NULL | |
5383 | && type->float_type() == NULL | |
5384 | && type->complex_type() == NULL | |
5385 | && !type->is_string_type()) | |
5386 | { | |
5387 | error_at(location, | |
5388 | "expected integer, floating, complex, or string type"); | |
5389 | return false; | |
5390 | } | |
5391 | break; | |
5392 | ||
5393 | case OPERATOR_MINUS: | |
5394 | case OPERATOR_MINUSEQ: | |
5395 | case OPERATOR_MULT: | |
5396 | case OPERATOR_MULTEQ: | |
5397 | case OPERATOR_DIV: | |
5398 | case OPERATOR_DIVEQ: | |
5399 | if (type->integer_type() == NULL | |
5400 | && type->float_type() == NULL | |
5401 | && type->complex_type() == NULL) | |
5402 | { | |
5403 | error_at(location, "expected integer, floating, or complex type"); | |
5404 | return false; | |
5405 | } | |
5406 | break; | |
5407 | ||
5408 | case OPERATOR_MOD: | |
5409 | case OPERATOR_MODEQ: | |
5410 | case OPERATOR_OR: | |
5411 | case OPERATOR_OREQ: | |
5412 | case OPERATOR_AND: | |
5413 | case OPERATOR_ANDEQ: | |
5414 | case OPERATOR_XOR: | |
5415 | case OPERATOR_XOREQ: | |
5416 | case OPERATOR_BITCLEAR: | |
5417 | case OPERATOR_BITCLEAREQ: | |
5418 | if (type->integer_type() == NULL) | |
5419 | { | |
5420 | error_at(location, "expected integer type"); | |
5421 | return false; | |
5422 | } | |
5423 | break; | |
5424 | ||
5425 | default: | |
c3e6f413 | 5426 | go_unreachable(); |
e440a328 | 5427 | } |
5428 | ||
5429 | return true; | |
5430 | } | |
5431 | ||
5432 | // Check types. | |
5433 | ||
5434 | void | |
5435 | Binary_expression::do_check_types(Gogo*) | |
5436 | { | |
5f5fea79 | 5437 | if (this->classification() == EXPRESSION_ERROR) |
5438 | return; | |
5439 | ||
e440a328 | 5440 | Type* left_type = this->left_->type(); |
5441 | Type* right_type = this->right_->type(); | |
5c13bd80 | 5442 | if (left_type->is_error() || right_type->is_error()) |
9fe897ef | 5443 | { |
5444 | this->set_is_error(); | |
5445 | return; | |
5446 | } | |
e440a328 | 5447 | |
5448 | if (this->op_ == OPERATOR_EQEQ | |
5449 | || this->op_ == OPERATOR_NOTEQ | |
5450 | || this->op_ == OPERATOR_LT | |
5451 | || this->op_ == OPERATOR_LE | |
5452 | || this->op_ == OPERATOR_GT | |
5453 | || this->op_ == OPERATOR_GE) | |
5454 | { | |
907c5ecd | 5455 | if (left_type->is_nil_type() && right_type->is_nil_type()) |
5456 | { | |
5457 | this->report_error(_("invalid comparison of nil with nil")); | |
5458 | return; | |
5459 | } | |
e440a328 | 5460 | if (!Type::are_assignable(left_type, right_type, NULL) |
5461 | && !Type::are_assignable(right_type, left_type, NULL)) | |
5462 | { | |
5463 | this->report_error(_("incompatible types in binary expression")); | |
5464 | return; | |
5465 | } | |
5466 | if (!Binary_expression::check_operator_type(this->op_, left_type, | |
be8b5eee | 5467 | right_type, |
e440a328 | 5468 | this->location()) |
5469 | || !Binary_expression::check_operator_type(this->op_, right_type, | |
be8b5eee | 5470 | left_type, |
e440a328 | 5471 | this->location())) |
5472 | { | |
5473 | this->set_is_error(); | |
5474 | return; | |
5475 | } | |
5476 | } | |
5477 | else if (this->op_ != OPERATOR_LSHIFT && this->op_ != OPERATOR_RSHIFT) | |
5478 | { | |
5479 | if (!Type::are_compatible_for_binop(left_type, right_type)) | |
5480 | { | |
5481 | this->report_error(_("incompatible types in binary expression")); | |
5482 | return; | |
5483 | } | |
5484 | if (!Binary_expression::check_operator_type(this->op_, left_type, | |
be8b5eee | 5485 | right_type, |
e440a328 | 5486 | this->location())) |
5487 | { | |
5488 | this->set_is_error(); | |
5489 | return; | |
5490 | } | |
5c65b19d | 5491 | if (this->op_ == OPERATOR_DIV || this->op_ == OPERATOR_MOD) |
5492 | { | |
5493 | // Division by a zero integer constant is an error. | |
5494 | Numeric_constant rconst; | |
5495 | unsigned long rval; | |
5496 | if (left_type->integer_type() != NULL | |
5497 | && this->right_->numeric_constant_value(&rconst) | |
5498 | && rconst.to_unsigned_long(&rval) == Numeric_constant::NC_UL_VALID | |
5499 | && rval == 0) | |
5500 | { | |
5501 | this->report_error(_("integer division by zero")); | |
5502 | return; | |
5503 | } | |
5504 | } | |
e440a328 | 5505 | } |
5506 | else | |
5507 | { | |
5508 | if (left_type->integer_type() == NULL) | |
5509 | this->report_error(_("shift of non-integer operand")); | |
5510 | ||
5511 | if (!right_type->is_abstract() | |
5512 | && (right_type->integer_type() == NULL | |
5513 | || !right_type->integer_type()->is_unsigned())) | |
5514 | this->report_error(_("shift count not unsigned integer")); | |
5515 | else | |
5516 | { | |
0c77715b | 5517 | Numeric_constant nc; |
5518 | if (this->right_->numeric_constant_value(&nc)) | |
e440a328 | 5519 | { |
0c77715b | 5520 | mpz_t val; |
5521 | if (!nc.to_int(&val)) | |
5522 | this->report_error(_("shift count not unsigned integer")); | |
5523 | else | |
a4eba91b | 5524 | { |
0c77715b | 5525 | if (mpz_sgn(val) < 0) |
5526 | { | |
5527 | this->report_error(_("negative shift count")); | |
0c77715b | 5528 | Location rloc = this->right_->location(); |
e67508fa | 5529 | this->right_ = Expression::make_integer_ul(0, right_type, |
5530 | rloc); | |
0c77715b | 5531 | } |
5532 | mpz_clear(val); | |
a4eba91b | 5533 | } |
e440a328 | 5534 | } |
e440a328 | 5535 | } |
5536 | } | |
5537 | } | |
5538 | ||
ea664253 | 5539 | // Get the backend representation for a binary expression. |
e440a328 | 5540 | |
ea664253 | 5541 | Bexpression* |
5542 | Binary_expression::do_get_backend(Translate_context* context) | |
e440a328 | 5543 | { |
1b1f2abf | 5544 | Gogo* gogo = context->gogo(); |
a32698ee | 5545 | Location loc = this->location(); |
5546 | Type* left_type = this->left_->type(); | |
5547 | Type* right_type = this->right_->type(); | |
1b1f2abf | 5548 | |
e440a328 | 5549 | bool use_left_type = true; |
5550 | bool is_shift_op = false; | |
29a2d1d8 | 5551 | bool is_idiv_op = false; |
e440a328 | 5552 | switch (this->op_) |
5553 | { | |
5554 | case OPERATOR_EQEQ: | |
5555 | case OPERATOR_NOTEQ: | |
5556 | case OPERATOR_LT: | |
5557 | case OPERATOR_LE: | |
5558 | case OPERATOR_GT: | |
5559 | case OPERATOR_GE: | |
ea664253 | 5560 | return Expression::comparison(context, this->type_, this->op_, |
5561 | this->left_, this->right_, loc); | |
e440a328 | 5562 | |
5563 | case OPERATOR_OROR: | |
e440a328 | 5564 | case OPERATOR_ANDAND: |
e440a328 | 5565 | use_left_type = false; |
5566 | break; | |
5567 | case OPERATOR_PLUS: | |
e440a328 | 5568 | case OPERATOR_MINUS: |
e440a328 | 5569 | case OPERATOR_OR: |
e440a328 | 5570 | case OPERATOR_XOR: |
e440a328 | 5571 | case OPERATOR_MULT: |
e440a328 | 5572 | break; |
5573 | case OPERATOR_DIV: | |
a32698ee | 5574 | if (left_type->float_type() != NULL || left_type->complex_type() != NULL) |
5575 | break; | |
e440a328 | 5576 | case OPERATOR_MOD: |
29a2d1d8 | 5577 | is_idiv_op = true; |
e440a328 | 5578 | break; |
5579 | case OPERATOR_LSHIFT: | |
e440a328 | 5580 | case OPERATOR_RSHIFT: |
e440a328 | 5581 | is_shift_op = true; |
5582 | break; | |
e440a328 | 5583 | case OPERATOR_BITCLEAR: |
a32698ee | 5584 | this->right_ = Expression::make_unary(OPERATOR_XOR, this->right_, loc); |
5585 | case OPERATOR_AND: | |
e440a328 | 5586 | break; |
5587 | default: | |
c3e6f413 | 5588 | go_unreachable(); |
e440a328 | 5589 | } |
5590 | ||
a32698ee | 5591 | if (left_type->is_string_type()) |
e440a328 | 5592 | { |
c484d925 | 5593 | go_assert(this->op_ == OPERATOR_PLUS); |
a32698ee | 5594 | Expression* string_plus = |
5595 | Runtime::make_call(Runtime::STRING_PLUS, loc, 2, | |
5596 | this->left_, this->right_); | |
ea664253 | 5597 | return string_plus->get_backend(context); |
a32698ee | 5598 | } |
5599 | ||
5600 | // For complex division Go might want slightly different results than the | |
5601 | // backend implementation provides, so we have our own runtime routine. | |
1850e20c | 5602 | if (this->op_ == OPERATOR_DIV && this->left_->type()->complex_type() != NULL) |
5603 | { | |
a32698ee | 5604 | Runtime::Function complex_code; |
1850e20c | 5605 | switch (this->left_->type()->complex_type()->bits()) |
5606 | { | |
5607 | case 64: | |
a32698ee | 5608 | complex_code = Runtime::COMPLEX64_DIV; |
1850e20c | 5609 | break; |
5610 | case 128: | |
a32698ee | 5611 | complex_code = Runtime::COMPLEX128_DIV; |
1850e20c | 5612 | break; |
5613 | default: | |
5614 | go_unreachable(); | |
5615 | } | |
a32698ee | 5616 | Expression* complex_div = |
5617 | Runtime::make_call(complex_code, loc, 2, this->left_, this->right_); | |
ea664253 | 5618 | return complex_div->get_backend(context); |
1850e20c | 5619 | } |
5620 | ||
ea664253 | 5621 | Bexpression* left = this->left_->get_backend(context); |
5622 | Bexpression* right = this->right_->get_backend(context); | |
e440a328 | 5623 | |
a32698ee | 5624 | Type* type = use_left_type ? left_type : right_type; |
5625 | Btype* btype = type->get_backend(gogo); | |
5626 | ||
5627 | Bexpression* ret = | |
5628 | gogo->backend()->binary_expression(this->op_, left, right, loc); | |
5629 | ret = gogo->backend()->convert_expression(btype, ret, loc); | |
e440a328 | 5630 | |
a32698ee | 5631 | // Initialize overflow constants. |
5632 | Bexpression* overflow; | |
5633 | mpz_t zero; | |
5634 | mpz_init_set_ui(zero, 0UL); | |
5635 | mpz_t one; | |
5636 | mpz_init_set_ui(one, 1UL); | |
5637 | mpz_t neg_one; | |
5638 | mpz_init_set_si(neg_one, -1); | |
e440a328 | 5639 | |
a32698ee | 5640 | Btype* left_btype = left_type->get_backend(gogo); |
5641 | Btype* right_btype = right_type->get_backend(gogo); | |
e440a328 | 5642 | |
5643 | // In Go, a shift larger than the size of the type is well-defined. | |
a32698ee | 5644 | // This is not true in C, so we need to insert a conditional. |
e440a328 | 5645 | if (is_shift_op) |
5646 | { | |
a32698ee | 5647 | go_assert(left_type->integer_type() != NULL); |
e440a328 | 5648 | |
a32698ee | 5649 | mpz_t bitsval; |
5650 | int bits = left_type->integer_type()->bits(); | |
5651 | mpz_init_set_ui(bitsval, bits); | |
5652 | Bexpression* bits_expr = | |
5653 | gogo->backend()->integer_constant_expression(right_btype, bitsval); | |
5654 | Bexpression* compare = | |
5655 | gogo->backend()->binary_expression(OPERATOR_LT, | |
5656 | right, bits_expr, loc); | |
e440a328 | 5657 | |
a32698ee | 5658 | Bexpression* zero_expr = |
5659 | gogo->backend()->integer_constant_expression(left_btype, zero); | |
5660 | overflow = zero_expr; | |
e440a328 | 5661 | if (this->op_ == OPERATOR_RSHIFT |
a32698ee | 5662 | && !left_type->integer_type()->is_unsigned()) |
e440a328 | 5663 | { |
a32698ee | 5664 | Bexpression* neg_expr = |
5665 | gogo->backend()->binary_expression(OPERATOR_LT, left, | |
5666 | zero_expr, loc); | |
5667 | Bexpression* neg_one_expr = | |
5668 | gogo->backend()->integer_constant_expression(left_btype, neg_one); | |
5669 | overflow = gogo->backend()->conditional_expression(btype, neg_expr, | |
5670 | neg_one_expr, | |
5671 | zero_expr, loc); | |
29a2d1d8 | 5672 | } |
a32698ee | 5673 | ret = gogo->backend()->conditional_expression(btype, compare, ret, |
5674 | overflow, loc); | |
5675 | mpz_clear(bitsval); | |
29a2d1d8 | 5676 | } |
5677 | ||
5678 | // Add checks for division by zero and division overflow as needed. | |
5679 | if (is_idiv_op) | |
5680 | { | |
5c3f3470 | 5681 | if (gogo->check_divide_by_zero()) |
29a2d1d8 | 5682 | { |
5683 | // right == 0 | |
a32698ee | 5684 | Bexpression* zero_expr = |
5685 | gogo->backend()->integer_constant_expression(right_btype, zero); | |
5686 | Bexpression* check = | |
5687 | gogo->backend()->binary_expression(OPERATOR_EQEQ, | |
5688 | right, zero_expr, loc); | |
29a2d1d8 | 5689 | |
a32698ee | 5690 | // __go_runtime_error(RUNTIME_ERROR_DIVISION_BY_ZERO) |
29a2d1d8 | 5691 | int errcode = RUNTIME_ERROR_DIVISION_BY_ZERO; |
ea664253 | 5692 | Bexpression* crash = gogo->runtime_error(errcode, |
5693 | loc)->get_backend(context); | |
29a2d1d8 | 5694 | |
5695 | // right == 0 ? (__go_runtime_error(...), 0) : ret | |
ea664253 | 5696 | ret = gogo->backend()->conditional_expression(btype, check, crash, |
5697 | ret, loc); | |
b13c66cd | 5698 | } |
5699 | ||
5c3f3470 | 5700 | if (gogo->check_divide_overflow()) |
29a2d1d8 | 5701 | { |
5702 | // right == -1 | |
5703 | // FIXME: It would be nice to say that this test is expected | |
5704 | // to return false. | |
a32698ee | 5705 | |
5706 | Bexpression* neg_one_expr = | |
5707 | gogo->backend()->integer_constant_expression(right_btype, neg_one); | |
5708 | Bexpression* check = | |
5709 | gogo->backend()->binary_expression(OPERATOR_EQEQ, | |
5710 | right, neg_one_expr, loc); | |
5711 | ||
5712 | Bexpression* zero_expr = | |
5713 | gogo->backend()->integer_constant_expression(btype, zero); | |
5714 | Bexpression* one_expr = | |
5715 | gogo->backend()->integer_constant_expression(btype, one); | |
5716 | ||
5717 | if (type->integer_type()->is_unsigned()) | |
29a2d1d8 | 5718 | { |
5719 | // An unsigned -1 is the largest possible number, so | |
5720 | // dividing is always 1 or 0. | |
a32698ee | 5721 | |
5722 | Bexpression* cmp = | |
5723 | gogo->backend()->binary_expression(OPERATOR_EQEQ, | |
5724 | left, right, loc); | |
29a2d1d8 | 5725 | if (this->op_ == OPERATOR_DIV) |
a32698ee | 5726 | overflow = |
5727 | gogo->backend()->conditional_expression(btype, cmp, | |
5728 | one_expr, zero_expr, | |
5729 | loc); | |
29a2d1d8 | 5730 | else |
a32698ee | 5731 | overflow = |
5732 | gogo->backend()->conditional_expression(btype, cmp, | |
5733 | zero_expr, left, | |
5734 | loc); | |
29a2d1d8 | 5735 | } |
5736 | else | |
5737 | { | |
5738 | // Computing left / -1 is the same as computing - left, | |
5739 | // which does not overflow since Go sets -fwrapv. | |
5740 | if (this->op_ == OPERATOR_DIV) | |
a32698ee | 5741 | { |
5742 | Expression* negate_expr = | |
5743 | Expression::make_unary(OPERATOR_MINUS, this->left_, loc); | |
ea664253 | 5744 | overflow = negate_expr->get_backend(context); |
a32698ee | 5745 | } |
29a2d1d8 | 5746 | else |
a32698ee | 5747 | overflow = zero_expr; |
29a2d1d8 | 5748 | } |
a32698ee | 5749 | overflow = gogo->backend()->convert_expression(btype, overflow, loc); |
29a2d1d8 | 5750 | |
5751 | // right == -1 ? - left : ret | |
a32698ee | 5752 | ret = gogo->backend()->conditional_expression(btype, check, overflow, |
5753 | ret, loc); | |
29a2d1d8 | 5754 | } |
e440a328 | 5755 | } |
5756 | ||
a32698ee | 5757 | mpz_clear(zero); |
5758 | mpz_clear(one); | |
5759 | mpz_clear(neg_one); | |
ea664253 | 5760 | return ret; |
e440a328 | 5761 | } |
5762 | ||
5763 | // Export a binary expression. | |
5764 | ||
5765 | void | |
5766 | Binary_expression::do_export(Export* exp) const | |
5767 | { | |
5768 | exp->write_c_string("("); | |
5769 | this->left_->export_expression(exp); | |
5770 | switch (this->op_) | |
5771 | { | |
5772 | case OPERATOR_OROR: | |
5773 | exp->write_c_string(" || "); | |
5774 | break; | |
5775 | case OPERATOR_ANDAND: | |
5776 | exp->write_c_string(" && "); | |
5777 | break; | |
5778 | case OPERATOR_EQEQ: | |
5779 | exp->write_c_string(" == "); | |
5780 | break; | |
5781 | case OPERATOR_NOTEQ: | |
5782 | exp->write_c_string(" != "); | |
5783 | break; | |
5784 | case OPERATOR_LT: | |
5785 | exp->write_c_string(" < "); | |
5786 | break; | |
5787 | case OPERATOR_LE: | |
5788 | exp->write_c_string(" <= "); | |
5789 | break; | |
5790 | case OPERATOR_GT: | |
5791 | exp->write_c_string(" > "); | |
5792 | break; | |
5793 | case OPERATOR_GE: | |
5794 | exp->write_c_string(" >= "); | |
5795 | break; | |
5796 | case OPERATOR_PLUS: | |
5797 | exp->write_c_string(" + "); | |
5798 | break; | |
5799 | case OPERATOR_MINUS: | |
5800 | exp->write_c_string(" - "); | |
5801 | break; | |
5802 | case OPERATOR_OR: | |
5803 | exp->write_c_string(" | "); | |
5804 | break; | |
5805 | case OPERATOR_XOR: | |
5806 | exp->write_c_string(" ^ "); | |
5807 | break; | |
5808 | case OPERATOR_MULT: | |
5809 | exp->write_c_string(" * "); | |
5810 | break; | |
5811 | case OPERATOR_DIV: | |
5812 | exp->write_c_string(" / "); | |
5813 | break; | |
5814 | case OPERATOR_MOD: | |
5815 | exp->write_c_string(" % "); | |
5816 | break; | |
5817 | case OPERATOR_LSHIFT: | |
5818 | exp->write_c_string(" << "); | |
5819 | break; | |
5820 | case OPERATOR_RSHIFT: | |
5821 | exp->write_c_string(" >> "); | |
5822 | break; | |
5823 | case OPERATOR_AND: | |
5824 | exp->write_c_string(" & "); | |
5825 | break; | |
5826 | case OPERATOR_BITCLEAR: | |
5827 | exp->write_c_string(" &^ "); | |
5828 | break; | |
5829 | default: | |
c3e6f413 | 5830 | go_unreachable(); |
e440a328 | 5831 | } |
5832 | this->right_->export_expression(exp); | |
5833 | exp->write_c_string(")"); | |
5834 | } | |
5835 | ||
5836 | // Import a binary expression. | |
5837 | ||
5838 | Expression* | |
5839 | Binary_expression::do_import(Import* imp) | |
5840 | { | |
5841 | imp->require_c_string("("); | |
5842 | ||
5843 | Expression* left = Expression::import_expression(imp); | |
5844 | ||
5845 | Operator op; | |
5846 | if (imp->match_c_string(" || ")) | |
5847 | { | |
5848 | op = OPERATOR_OROR; | |
5849 | imp->advance(4); | |
5850 | } | |
5851 | else if (imp->match_c_string(" && ")) | |
5852 | { | |
5853 | op = OPERATOR_ANDAND; | |
5854 | imp->advance(4); | |
5855 | } | |
5856 | else if (imp->match_c_string(" == ")) | |
5857 | { | |
5858 | op = OPERATOR_EQEQ; | |
5859 | imp->advance(4); | |
5860 | } | |
5861 | else if (imp->match_c_string(" != ")) | |
5862 | { | |
5863 | op = OPERATOR_NOTEQ; | |
5864 | imp->advance(4); | |
5865 | } | |
5866 | else if (imp->match_c_string(" < ")) | |
5867 | { | |
5868 | op = OPERATOR_LT; | |
5869 | imp->advance(3); | |
5870 | } | |
5871 | else if (imp->match_c_string(" <= ")) | |
5872 | { | |
5873 | op = OPERATOR_LE; | |
5874 | imp->advance(4); | |
5875 | } | |
5876 | else if (imp->match_c_string(" > ")) | |
5877 | { | |
5878 | op = OPERATOR_GT; | |
5879 | imp->advance(3); | |
5880 | } | |
5881 | else if (imp->match_c_string(" >= ")) | |
5882 | { | |
5883 | op = OPERATOR_GE; | |
5884 | imp->advance(4); | |
5885 | } | |
5886 | else if (imp->match_c_string(" + ")) | |
5887 | { | |
5888 | op = OPERATOR_PLUS; | |
5889 | imp->advance(3); | |
5890 | } | |
5891 | else if (imp->match_c_string(" - ")) | |
5892 | { | |
5893 | op = OPERATOR_MINUS; | |
5894 | imp->advance(3); | |
5895 | } | |
5896 | else if (imp->match_c_string(" | ")) | |
5897 | { | |
5898 | op = OPERATOR_OR; | |
5899 | imp->advance(3); | |
5900 | } | |
5901 | else if (imp->match_c_string(" ^ ")) | |
5902 | { | |
5903 | op = OPERATOR_XOR; | |
5904 | imp->advance(3); | |
5905 | } | |
5906 | else if (imp->match_c_string(" * ")) | |
5907 | { | |
5908 | op = OPERATOR_MULT; | |
5909 | imp->advance(3); | |
5910 | } | |
5911 | else if (imp->match_c_string(" / ")) | |
5912 | { | |
5913 | op = OPERATOR_DIV; | |
5914 | imp->advance(3); | |
5915 | } | |
5916 | else if (imp->match_c_string(" % ")) | |
5917 | { | |
5918 | op = OPERATOR_MOD; | |
5919 | imp->advance(3); | |
5920 | } | |
5921 | else if (imp->match_c_string(" << ")) | |
5922 | { | |
5923 | op = OPERATOR_LSHIFT; | |
5924 | imp->advance(4); | |
5925 | } | |
5926 | else if (imp->match_c_string(" >> ")) | |
5927 | { | |
5928 | op = OPERATOR_RSHIFT; | |
5929 | imp->advance(4); | |
5930 | } | |
5931 | else if (imp->match_c_string(" & ")) | |
5932 | { | |
5933 | op = OPERATOR_AND; | |
5934 | imp->advance(3); | |
5935 | } | |
5936 | else if (imp->match_c_string(" &^ ")) | |
5937 | { | |
5938 | op = OPERATOR_BITCLEAR; | |
5939 | imp->advance(4); | |
5940 | } | |
5941 | else | |
5942 | { | |
5943 | error_at(imp->location(), "unrecognized binary operator"); | |
5944 | return Expression::make_error(imp->location()); | |
5945 | } | |
5946 | ||
5947 | Expression* right = Expression::import_expression(imp); | |
5948 | ||
5949 | imp->require_c_string(")"); | |
5950 | ||
5951 | return Expression::make_binary(op, left, right, imp->location()); | |
5952 | } | |
5953 | ||
d751bb78 | 5954 | // Dump ast representation of a binary expression. |
5955 | ||
5956 | void | |
5957 | Binary_expression::do_dump_expression(Ast_dump_context* ast_dump_context) const | |
5958 | { | |
5959 | ast_dump_context->ostream() << "("; | |
5960 | ast_dump_context->dump_expression(this->left_); | |
5961 | ast_dump_context->ostream() << " "; | |
5962 | ast_dump_context->dump_operator(this->op_); | |
5963 | ast_dump_context->ostream() << " "; | |
5964 | ast_dump_context->dump_expression(this->right_); | |
5965 | ast_dump_context->ostream() << ") "; | |
5966 | } | |
5967 | ||
e440a328 | 5968 | // Make a binary expression. |
5969 | ||
5970 | Expression* | |
5971 | Expression::make_binary(Operator op, Expression* left, Expression* right, | |
b13c66cd | 5972 | Location location) |
e440a328 | 5973 | { |
5974 | return new Binary_expression(op, left, right, location); | |
5975 | } | |
5976 | ||
5977 | // Implement a comparison. | |
5978 | ||
a32698ee | 5979 | Bexpression* |
5980 | Expression::comparison(Translate_context* context, Type* result_type, | |
5981 | Operator op, Expression* left, Expression* right, | |
5982 | Location location) | |
e440a328 | 5983 | { |
2387f644 | 5984 | Type* left_type = left->type(); |
5985 | Type* right_type = right->type(); | |
ceeb12d7 | 5986 | |
e67508fa | 5987 | Expression* zexpr = Expression::make_integer_ul(0, NULL, location); |
1b1f2abf | 5988 | |
15c67ee2 | 5989 | if (left_type->is_string_type() && right_type->is_string_type()) |
e440a328 | 5990 | { |
2387f644 | 5991 | left = Runtime::make_call(Runtime::STRCMP, location, 2, |
5992 | left, right); | |
5993 | right = zexpr; | |
e440a328 | 5994 | } |
15c67ee2 | 5995 | else if ((left_type->interface_type() != NULL |
5996 | && right_type->interface_type() == NULL | |
5997 | && !right_type->is_nil_type()) | |
5998 | || (left_type->interface_type() == NULL | |
5999 | && !left_type->is_nil_type() | |
6000 | && right_type->interface_type() != NULL)) | |
e440a328 | 6001 | { |
6002 | // Comparing an interface value to a non-interface value. | |
6003 | if (left_type->interface_type() == NULL) | |
6004 | { | |
6005 | std::swap(left_type, right_type); | |
2387f644 | 6006 | std::swap(left, right); |
e440a328 | 6007 | } |
6008 | ||
6009 | // The right operand is not an interface. We need to take its | |
6010 | // address if it is not a pointer. | |
ceeb12d7 | 6011 | Expression* pointer_arg = NULL; |
e440a328 | 6012 | if (right_type->points_to() != NULL) |
2387f644 | 6013 | pointer_arg = right; |
e440a328 | 6014 | else |
6015 | { | |
2387f644 | 6016 | go_assert(right->is_addressable()); |
6017 | pointer_arg = Expression::make_unary(OPERATOR_AND, right, | |
ceeb12d7 | 6018 | location); |
e440a328 | 6019 | } |
e440a328 | 6020 | |
2387f644 | 6021 | Expression* descriptor = |
6022 | Expression::make_type_descriptor(right_type, location); | |
6023 | left = | |
ceeb12d7 | 6024 | Runtime::make_call((left_type->interface_type()->is_empty() |
6025 | ? Runtime::EMPTY_INTERFACE_VALUE_COMPARE | |
6026 | : Runtime::INTERFACE_VALUE_COMPARE), | |
2387f644 | 6027 | location, 3, left, descriptor, |
ceeb12d7 | 6028 | pointer_arg); |
2387f644 | 6029 | right = zexpr; |
e440a328 | 6030 | } |
6031 | else if (left_type->interface_type() != NULL | |
6032 | && right_type->interface_type() != NULL) | |
6033 | { | |
ceeb12d7 | 6034 | Runtime::Function compare_function; |
739bad04 | 6035 | if (left_type->interface_type()->is_empty() |
6036 | && right_type->interface_type()->is_empty()) | |
ceeb12d7 | 6037 | compare_function = Runtime::EMPTY_INTERFACE_COMPARE; |
739bad04 | 6038 | else if (!left_type->interface_type()->is_empty() |
6039 | && !right_type->interface_type()->is_empty()) | |
ceeb12d7 | 6040 | compare_function = Runtime::INTERFACE_COMPARE; |
739bad04 | 6041 | else |
6042 | { | |
6043 | if (left_type->interface_type()->is_empty()) | |
6044 | { | |
c484d925 | 6045 | go_assert(op == OPERATOR_EQEQ || op == OPERATOR_NOTEQ); |
739bad04 | 6046 | std::swap(left_type, right_type); |
2387f644 | 6047 | std::swap(left, right); |
739bad04 | 6048 | } |
c484d925 | 6049 | go_assert(!left_type->interface_type()->is_empty()); |
6050 | go_assert(right_type->interface_type()->is_empty()); | |
ceeb12d7 | 6051 | compare_function = Runtime::INTERFACE_EMPTY_COMPARE; |
739bad04 | 6052 | } |
6053 | ||
2387f644 | 6054 | left = Runtime::make_call(compare_function, location, 2, left, right); |
6055 | right = zexpr; | |
e440a328 | 6056 | } |
6057 | ||
6058 | if (left_type->is_nil_type() | |
6059 | && (op == OPERATOR_EQEQ || op == OPERATOR_NOTEQ)) | |
6060 | { | |
6061 | std::swap(left_type, right_type); | |
2387f644 | 6062 | std::swap(left, right); |
e440a328 | 6063 | } |
6064 | ||
6065 | if (right_type->is_nil_type()) | |
6066 | { | |
2387f644 | 6067 | right = Expression::make_nil(location); |
e440a328 | 6068 | if (left_type->array_type() != NULL |
6069 | && left_type->array_type()->length() == NULL) | |
6070 | { | |
6071 | Array_type* at = left_type->array_type(); | |
2387f644 | 6072 | left = at->get_value_pointer(context->gogo(), left); |
e440a328 | 6073 | } |
6074 | else if (left_type->interface_type() != NULL) | |
6075 | { | |
6076 | // An interface is nil if the first field is nil. | |
2387f644 | 6077 | left = Expression::make_field_reference(left, 0, location); |
e440a328 | 6078 | } |
6079 | } | |
6080 | ||
ea664253 | 6081 | Bexpression* left_bexpr = left->get_backend(context); |
6082 | Bexpression* right_bexpr = right->get_backend(context); | |
e90c9dfc | 6083 | |
a32698ee | 6084 | Gogo* gogo = context->gogo(); |
6085 | Bexpression* ret = gogo->backend()->binary_expression(op, left_bexpr, | |
6086 | right_bexpr, location); | |
6087 | if (result_type != NULL) | |
6088 | ret = gogo->backend()->convert_expression(result_type->get_backend(gogo), | |
6089 | ret, location); | |
e440a328 | 6090 | return ret; |
6091 | } | |
6092 | ||
6093 | // Class Bound_method_expression. | |
6094 | ||
6095 | // Traversal. | |
6096 | ||
6097 | int | |
6098 | Bound_method_expression::do_traverse(Traverse* traverse) | |
6099 | { | |
e0659c9e | 6100 | return Expression::traverse(&this->expr_, traverse); |
e440a328 | 6101 | } |
6102 | ||
0afbb937 | 6103 | // Lower the expression. If this is a method value rather than being |
6104 | // called, and the method is accessed via a pointer, we may need to | |
6105 | // add nil checks. Introduce a temporary variable so that those nil | |
6106 | // checks do not cause multiple evaluation. | |
6107 | ||
6108 | Expression* | |
6109 | Bound_method_expression::do_lower(Gogo*, Named_object*, | |
6110 | Statement_inserter* inserter, int) | |
6111 | { | |
6112 | // For simplicity we use a temporary for every call to an embedded | |
6113 | // method, even though some of them might be pure value methods and | |
6114 | // not require a temporary. | |
6115 | if (this->expr_->var_expression() == NULL | |
6116 | && this->expr_->temporary_reference_expression() == NULL | |
6117 | && this->expr_->set_and_use_temporary_expression() == NULL | |
6118 | && (this->method_->field_indexes() != NULL | |
6119 | || (this->method_->is_value_method() | |
6120 | && this->expr_->type()->points_to() != NULL))) | |
6121 | { | |
6122 | Temporary_statement* temp = | |
6123 | Statement::make_temporary(this->expr_->type(), NULL, this->location()); | |
6124 | inserter->insert(temp); | |
6125 | this->expr_ = Expression::make_set_and_use_temporary(temp, this->expr_, | |
6126 | this->location()); | |
6127 | } | |
6128 | return this; | |
6129 | } | |
6130 | ||
e440a328 | 6131 | // Return the type of a bound method expression. The type of this |
0afbb937 | 6132 | // object is simply the type of the method with no receiver. |
e440a328 | 6133 | |
6134 | Type* | |
6135 | Bound_method_expression::do_type() | |
6136 | { | |
0afbb937 | 6137 | Named_object* fn = this->method_->named_object(); |
6138 | Function_type* fntype; | |
6139 | if (fn->is_function()) | |
6140 | fntype = fn->func_value()->type(); | |
6141 | else if (fn->is_function_declaration()) | |
6142 | fntype = fn->func_declaration_value()->type(); | |
e0659c9e | 6143 | else |
6144 | return Type::make_error_type(); | |
0afbb937 | 6145 | return fntype->copy_without_receiver(); |
e440a328 | 6146 | } |
6147 | ||
6148 | // Determine the types of a method expression. | |
6149 | ||
6150 | void | |
6151 | Bound_method_expression::do_determine_type(const Type_context*) | |
6152 | { | |
0afbb937 | 6153 | Named_object* fn = this->method_->named_object(); |
6154 | Function_type* fntype; | |
6155 | if (fn->is_function()) | |
6156 | fntype = fn->func_value()->type(); | |
6157 | else if (fn->is_function_declaration()) | |
6158 | fntype = fn->func_declaration_value()->type(); | |
6159 | else | |
6160 | fntype = NULL; | |
e440a328 | 6161 | if (fntype == NULL || !fntype->is_method()) |
6162 | this->expr_->determine_type_no_context(); | |
6163 | else | |
6164 | { | |
6165 | Type_context subcontext(fntype->receiver()->type(), false); | |
6166 | this->expr_->determine_type(&subcontext); | |
6167 | } | |
6168 | } | |
6169 | ||
6170 | // Check the types of a method expression. | |
6171 | ||
6172 | void | |
6173 | Bound_method_expression::do_check_types(Gogo*) | |
6174 | { | |
0afbb937 | 6175 | Named_object* fn = this->method_->named_object(); |
6176 | if (!fn->is_function() && !fn->is_function_declaration()) | |
6177 | { | |
6178 | this->report_error(_("object is not a method")); | |
6179 | return; | |
6180 | } | |
6181 | ||
6182 | Function_type* fntype; | |
6183 | if (fn->is_function()) | |
6184 | fntype = fn->func_value()->type(); | |
6185 | else if (fn->is_function_declaration()) | |
6186 | fntype = fn->func_declaration_value()->type(); | |
e440a328 | 6187 | else |
0afbb937 | 6188 | go_unreachable(); |
6189 | Type* rtype = fntype->receiver()->type()->deref(); | |
6190 | Type* etype = (this->expr_type_ != NULL | |
6191 | ? this->expr_type_ | |
6192 | : this->expr_->type()); | |
6193 | etype = etype->deref(); | |
6194 | if (!Type::are_identical(rtype, etype, true, NULL)) | |
6195 | this->report_error(_("method type does not match object type")); | |
6196 | } | |
6197 | ||
6198 | // If a bound method expression is not simply called, then it is | |
6199 | // represented as a closure. The closure will hold a single variable, | |
6200 | // the receiver to pass to the method. The function will be a simple | |
6201 | // thunk that pulls that value from the closure and calls the method | |
6202 | // with the remaining arguments. | |
6203 | // | |
6204 | // Because method values are not common, we don't build all thunks for | |
6205 | // every methods, but instead only build them as we need them. In | |
6206 | // particular, we even build them on demand for methods defined in | |
6207 | // other packages. | |
6208 | ||
6209 | Bound_method_expression::Method_value_thunks | |
6210 | Bound_method_expression::method_value_thunks; | |
6211 | ||
6212 | // Find or create the thunk for METHOD. | |
6213 | ||
6214 | Named_object* | |
6215 | Bound_method_expression::create_thunk(Gogo* gogo, const Method* method, | |
6216 | Named_object* fn) | |
6217 | { | |
6218 | std::pair<Named_object*, Named_object*> val(fn, NULL); | |
6219 | std::pair<Method_value_thunks::iterator, bool> ins = | |
6220 | Bound_method_expression::method_value_thunks.insert(val); | |
6221 | if (!ins.second) | |
6222 | { | |
6223 | // We have seen this method before. | |
6224 | go_assert(ins.first->second != NULL); | |
6225 | return ins.first->second; | |
6226 | } | |
6227 | ||
6228 | Location loc = fn->location(); | |
6229 | ||
6230 | Function_type* orig_fntype; | |
6231 | if (fn->is_function()) | |
6232 | orig_fntype = fn->func_value()->type(); | |
6233 | else if (fn->is_function_declaration()) | |
6234 | orig_fntype = fn->func_declaration_value()->type(); | |
6235 | else | |
6236 | orig_fntype = NULL; | |
6237 | ||
6238 | if (orig_fntype == NULL || !orig_fntype->is_method()) | |
e440a328 | 6239 | { |
0afbb937 | 6240 | ins.first->second = Named_object::make_erroneous_name(Gogo::thunk_name()); |
6241 | return ins.first->second; | |
e440a328 | 6242 | } |
0afbb937 | 6243 | |
6244 | Struct_field_list* sfl = new Struct_field_list(); | |
f8bdf81a | 6245 | // The type here is wrong--it should be the C function type. But it |
6246 | // doesn't really matter. | |
0afbb937 | 6247 | Type* vt = Type::make_pointer_type(Type::make_void_type()); |
6248 | sfl->push_back(Struct_field(Typed_identifier("fn.0", vt, loc))); | |
6249 | sfl->push_back(Struct_field(Typed_identifier("val.1", | |
6250 | orig_fntype->receiver()->type(), | |
6251 | loc))); | |
6252 | Type* closure_type = Type::make_struct_type(sfl, loc); | |
6253 | closure_type = Type::make_pointer_type(closure_type); | |
6254 | ||
f8bdf81a | 6255 | Function_type* new_fntype = orig_fntype->copy_with_names(); |
0afbb937 | 6256 | |
da244e59 | 6257 | std::string thunk_name = Gogo::thunk_name(); |
6258 | Named_object* new_no = gogo->start_function(thunk_name, new_fntype, | |
0afbb937 | 6259 | false, loc); |
6260 | ||
f8bdf81a | 6261 | Variable* cvar = new Variable(closure_type, NULL, false, false, false, loc); |
6262 | cvar->set_is_used(); | |
1ecc6157 | 6263 | cvar->set_is_closure(); |
da244e59 | 6264 | Named_object* cp = Named_object::make_variable("$closure" + thunk_name, |
6265 | NULL, cvar); | |
f8bdf81a | 6266 | new_no->func_value()->set_closure_var(cp); |
0afbb937 | 6267 | |
f8bdf81a | 6268 | gogo->start_block(loc); |
0afbb937 | 6269 | |
6270 | // Field 0 of the closure is the function code pointer, field 1 is | |
6271 | // the value on which to invoke the method. | |
6272 | Expression* arg = Expression::make_var_reference(cp, loc); | |
6273 | arg = Expression::make_unary(OPERATOR_MULT, arg, loc); | |
6274 | arg = Expression::make_field_reference(arg, 1, loc); | |
6275 | ||
6276 | Expression* bme = Expression::make_bound_method(arg, method, fn, loc); | |
6277 | ||
6278 | const Typed_identifier_list* orig_params = orig_fntype->parameters(); | |
6279 | Expression_list* args; | |
6280 | if (orig_params == NULL || orig_params->empty()) | |
6281 | args = NULL; | |
6282 | else | |
6283 | { | |
6284 | const Typed_identifier_list* new_params = new_fntype->parameters(); | |
6285 | args = new Expression_list(); | |
6286 | for (Typed_identifier_list::const_iterator p = new_params->begin(); | |
f8bdf81a | 6287 | p != new_params->end(); |
0afbb937 | 6288 | ++p) |
6289 | { | |
6290 | Named_object* p_no = gogo->lookup(p->name(), NULL); | |
6291 | go_assert(p_no != NULL | |
6292 | && p_no->is_variable() | |
6293 | && p_no->var_value()->is_parameter()); | |
6294 | args->push_back(Expression::make_var_reference(p_no, loc)); | |
6295 | } | |
6296 | } | |
6297 | ||
6298 | Call_expression* call = Expression::make_call(bme, args, | |
6299 | orig_fntype->is_varargs(), | |
6300 | loc); | |
6301 | call->set_varargs_are_lowered(); | |
6302 | ||
6303 | Statement* s = Statement::make_return_from_call(call, loc); | |
6304 | gogo->add_statement(s); | |
6305 | Block* b = gogo->finish_block(loc); | |
6306 | gogo->add_block(b, loc); | |
6307 | gogo->lower_block(new_no, b); | |
a32698ee | 6308 | gogo->flatten_block(new_no, b); |
0afbb937 | 6309 | gogo->finish_function(loc); |
6310 | ||
6311 | ins.first->second = new_no; | |
6312 | return new_no; | |
6313 | } | |
6314 | ||
6315 | // Return an expression to check *REF for nil while dereferencing | |
6316 | // according to FIELD_INDEXES. Update *REF to build up the field | |
6317 | // reference. This is a static function so that we don't have to | |
6318 | // worry about declaring Field_indexes in expressions.h. | |
6319 | ||
6320 | static Expression* | |
6321 | bme_check_nil(const Method::Field_indexes* field_indexes, Location loc, | |
6322 | Expression** ref) | |
6323 | { | |
6324 | if (field_indexes == NULL) | |
6325 | return Expression::make_boolean(false, loc); | |
6326 | Expression* cond = bme_check_nil(field_indexes->next, loc, ref); | |
6327 | Struct_type* stype = (*ref)->type()->deref()->struct_type(); | |
6328 | go_assert(stype != NULL | |
6329 | && field_indexes->field_index < stype->field_count()); | |
6330 | if ((*ref)->type()->struct_type() == NULL) | |
6331 | { | |
6332 | go_assert((*ref)->type()->points_to() != NULL); | |
6333 | Expression* n = Expression::make_binary(OPERATOR_EQEQ, *ref, | |
6334 | Expression::make_nil(loc), | |
6335 | loc); | |
6336 | cond = Expression::make_binary(OPERATOR_OROR, cond, n, loc); | |
6337 | *ref = Expression::make_unary(OPERATOR_MULT, *ref, loc); | |
6338 | go_assert((*ref)->type()->struct_type() == stype); | |
6339 | } | |
6340 | *ref = Expression::make_field_reference(*ref, field_indexes->field_index, | |
6341 | loc); | |
6342 | return cond; | |
e440a328 | 6343 | } |
6344 | ||
ea664253 | 6345 | // Get the backend representation for a method value. |
e440a328 | 6346 | |
ea664253 | 6347 | Bexpression* |
6348 | Bound_method_expression::do_get_backend(Translate_context* context) | |
e440a328 | 6349 | { |
0afbb937 | 6350 | Named_object* thunk = Bound_method_expression::create_thunk(context->gogo(), |
6351 | this->method_, | |
6352 | this->function_); | |
6353 | if (thunk->is_erroneous()) | |
6354 | { | |
6355 | go_assert(saw_errors()); | |
ea664253 | 6356 | return context->backend()->error_expression(); |
0afbb937 | 6357 | } |
6358 | ||
6359 | // FIXME: We should lower this earlier, but we can't lower it in the | |
6360 | // lowering pass because at that point we don't know whether we need | |
6361 | // to create the thunk or not. If the expression is called, we | |
6362 | // don't need the thunk. | |
6363 | ||
6364 | Location loc = this->location(); | |
6365 | ||
6366 | // If the method expects a value, and we have a pointer, we need to | |
6367 | // dereference the pointer. | |
6368 | ||
6369 | Named_object* fn = this->method_->named_object(); | |
6370 | Function_type* fntype; | |
6371 | if (fn->is_function()) | |
6372 | fntype = fn->func_value()->type(); | |
6373 | else if (fn->is_function_declaration()) | |
6374 | fntype = fn->func_declaration_value()->type(); | |
6375 | else | |
6376 | go_unreachable(); | |
6377 | ||
6378 | Expression* val = this->expr_; | |
6379 | if (fntype->receiver()->type()->points_to() == NULL | |
6380 | && val->type()->points_to() != NULL) | |
6381 | val = Expression::make_unary(OPERATOR_MULT, val, loc); | |
6382 | ||
6383 | // Note that we are ignoring this->expr_type_ here. The thunk will | |
6384 | // expect a closure whose second field has type this->expr_type_ (if | |
6385 | // that is not NULL). We are going to pass it a closure whose | |
6386 | // second field has type this->expr_->type(). Since | |
6387 | // this->expr_type_ is only not-NULL for pointer types, we can get | |
6388 | // away with this. | |
6389 | ||
6390 | Struct_field_list* fields = new Struct_field_list(); | |
6391 | fields->push_back(Struct_field(Typed_identifier("fn.0", | |
6392 | thunk->func_value()->type(), | |
6393 | loc))); | |
6394 | fields->push_back(Struct_field(Typed_identifier("val.1", val->type(), loc))); | |
6395 | Struct_type* st = Type::make_struct_type(fields, loc); | |
6396 | ||
6397 | Expression_list* vals = new Expression_list(); | |
6398 | vals->push_back(Expression::make_func_code_reference(thunk, loc)); | |
6399 | vals->push_back(val); | |
6400 | ||
6401 | Expression* ret = Expression::make_struct_composite_literal(st, vals, loc); | |
2c809f8f | 6402 | ret = Expression::make_heap_expression(ret, loc); |
0afbb937 | 6403 | |
0afbb937 | 6404 | // See whether the expression or any embedded pointers are nil. |
6405 | ||
df7ef1fd | 6406 | Expression* nil_check = NULL; |
0afbb937 | 6407 | Expression* expr = this->expr_; |
6408 | if (this->method_->field_indexes() != NULL) | |
6409 | { | |
6410 | // Note that we are evaluating this->expr_ twice, but that is OK | |
6411 | // because in the lowering pass we forced it into a temporary | |
6412 | // variable. | |
6413 | Expression* ref = expr; | |
6414 | nil_check = bme_check_nil(this->method_->field_indexes(), loc, &ref); | |
6415 | expr = ref; | |
6416 | } | |
6417 | ||
6418 | if (this->method_->is_value_method() && expr->type()->points_to() != NULL) | |
6419 | { | |
6420 | Expression* n = Expression::make_binary(OPERATOR_EQEQ, expr, | |
6421 | Expression::make_nil(loc), | |
6422 | loc); | |
6423 | if (nil_check == NULL) | |
6424 | nil_check = n; | |
6425 | else | |
6426 | nil_check = Expression::make_binary(OPERATOR_OROR, nil_check, n, loc); | |
6427 | } | |
6428 | ||
ea664253 | 6429 | Bexpression* bme = ret->get_backend(context); |
0afbb937 | 6430 | if (nil_check != NULL) |
6431 | { | |
df7ef1fd | 6432 | Gogo* gogo = context->gogo(); |
ea664253 | 6433 | Bexpression* crash = |
6434 | gogo->runtime_error(RUNTIME_ERROR_NIL_DEREFERENCE, | |
6435 | loc)->get_backend(context); | |
df7ef1fd | 6436 | Btype* btype = ret->type()->get_backend(gogo); |
ea664253 | 6437 | Bexpression* bcheck = nil_check->get_backend(context); |
6438 | bme = gogo->backend()->conditional_expression(btype, bcheck, crash, | |
df7ef1fd | 6439 | bme, loc); |
6440 | } | |
ea664253 | 6441 | return bme; |
e440a328 | 6442 | } |
6443 | ||
d751bb78 | 6444 | // Dump ast representation of a bound method expression. |
6445 | ||
6446 | void | |
6447 | Bound_method_expression::do_dump_expression(Ast_dump_context* ast_dump_context) | |
6448 | const | |
6449 | { | |
6450 | if (this->expr_type_ != NULL) | |
6451 | ast_dump_context->ostream() << "("; | |
6452 | ast_dump_context->dump_expression(this->expr_); | |
6453 | if (this->expr_type_ != NULL) | |
6454 | { | |
6455 | ast_dump_context->ostream() << ":"; | |
6456 | ast_dump_context->dump_type(this->expr_type_); | |
6457 | ast_dump_context->ostream() << ")"; | |
6458 | } | |
6459 | ||
0afbb937 | 6460 | ast_dump_context->ostream() << "." << this->function_->name(); |
d751bb78 | 6461 | } |
6462 | ||
e440a328 | 6463 | // Make a method expression. |
6464 | ||
6465 | Bound_method_expression* | |
0afbb937 | 6466 | Expression::make_bound_method(Expression* expr, const Method* method, |
6467 | Named_object* function, Location location) | |
e440a328 | 6468 | { |
0afbb937 | 6469 | return new Bound_method_expression(expr, method, function, location); |
e440a328 | 6470 | } |
6471 | ||
6472 | // Class Builtin_call_expression. This is used for a call to a | |
6473 | // builtin function. | |
6474 | ||
6475 | class Builtin_call_expression : public Call_expression | |
6476 | { | |
6477 | public: | |
6478 | Builtin_call_expression(Gogo* gogo, Expression* fn, Expression_list* args, | |
b13c66cd | 6479 | bool is_varargs, Location location); |
e440a328 | 6480 | |
6481 | protected: | |
6482 | // This overrides Call_expression::do_lower. | |
6483 | Expression* | |
ceeb4318 | 6484 | do_lower(Gogo*, Named_object*, Statement_inserter*, int); |
e440a328 | 6485 | |
35a54f17 | 6486 | Expression* |
6487 | do_flatten(Gogo*, Named_object*, Statement_inserter*); | |
6488 | ||
e440a328 | 6489 | bool |
6490 | do_is_constant() const; | |
6491 | ||
6492 | bool | |
0c77715b | 6493 | do_numeric_constant_value(Numeric_constant*) const; |
e440a328 | 6494 | |
4f2138d7 | 6495 | bool |
a7549a6a | 6496 | do_discarding_value(); |
6497 | ||
e440a328 | 6498 | Type* |
6499 | do_type(); | |
6500 | ||
6501 | void | |
6502 | do_determine_type(const Type_context*); | |
6503 | ||
6504 | void | |
6505 | do_check_types(Gogo*); | |
6506 | ||
6507 | Expression* | |
72666aed | 6508 | do_copy(); |
e440a328 | 6509 | |
ea664253 | 6510 | Bexpression* |
6511 | do_get_backend(Translate_context*); | |
e440a328 | 6512 | |
6513 | void | |
6514 | do_export(Export*) const; | |
6515 | ||
6516 | virtual bool | |
6517 | do_is_recover_call() const; | |
6518 | ||
6519 | virtual void | |
6520 | do_set_recover_arg(Expression*); | |
6521 | ||
6522 | private: | |
6523 | // The builtin functions. | |
6524 | enum Builtin_function_code | |
6525 | { | |
6526 | BUILTIN_INVALID, | |
6527 | ||
6528 | // Predeclared builtin functions. | |
6529 | BUILTIN_APPEND, | |
6530 | BUILTIN_CAP, | |
6531 | BUILTIN_CLOSE, | |
48080209 | 6532 | BUILTIN_COMPLEX, |
e440a328 | 6533 | BUILTIN_COPY, |
1cce762f | 6534 | BUILTIN_DELETE, |
e440a328 | 6535 | BUILTIN_IMAG, |
6536 | BUILTIN_LEN, | |
6537 | BUILTIN_MAKE, | |
6538 | BUILTIN_NEW, | |
6539 | BUILTIN_PANIC, | |
6540 | BUILTIN_PRINT, | |
6541 | BUILTIN_PRINTLN, | |
6542 | BUILTIN_REAL, | |
6543 | BUILTIN_RECOVER, | |
6544 | ||
6545 | // Builtin functions from the unsafe package. | |
6546 | BUILTIN_ALIGNOF, | |
6547 | BUILTIN_OFFSETOF, | |
6548 | BUILTIN_SIZEOF | |
6549 | }; | |
6550 | ||
6551 | Expression* | |
6552 | one_arg() const; | |
6553 | ||
6554 | bool | |
6555 | check_one_arg(); | |
6556 | ||
6557 | static Type* | |
6558 | real_imag_type(Type*); | |
6559 | ||
6560 | static Type* | |
48080209 | 6561 | complex_type(Type*); |
e440a328 | 6562 | |
a9182619 | 6563 | Expression* |
6564 | lower_make(); | |
6565 | ||
6566 | bool | |
1ad00fd4 | 6567 | check_int_value(Expression*, bool is_length); |
a9182619 | 6568 | |
e440a328 | 6569 | // A pointer back to the general IR structure. This avoids a global |
6570 | // variable, or passing it around everywhere. | |
6571 | Gogo* gogo_; | |
6572 | // The builtin function being called. | |
6573 | Builtin_function_code code_; | |
0f914071 | 6574 | // Used to stop endless loops when the length of an array uses len |
6575 | // or cap of the array itself. | |
6576 | mutable bool seen_; | |
6334270b | 6577 | // Whether the argument is set for calls to BUILTIN_RECOVER. |
6578 | bool recover_arg_is_set_; | |
e440a328 | 6579 | }; |
6580 | ||
6581 | Builtin_call_expression::Builtin_call_expression(Gogo* gogo, | |
6582 | Expression* fn, | |
6583 | Expression_list* args, | |
6584 | bool is_varargs, | |
b13c66cd | 6585 | Location location) |
e440a328 | 6586 | : Call_expression(fn, args, is_varargs, location), |
6334270b | 6587 | gogo_(gogo), code_(BUILTIN_INVALID), seen_(false), |
6588 | recover_arg_is_set_(false) | |
e440a328 | 6589 | { |
6590 | Func_expression* fnexp = this->fn()->func_expression(); | |
c484d925 | 6591 | go_assert(fnexp != NULL); |
e440a328 | 6592 | const std::string& name(fnexp->named_object()->name()); |
6593 | if (name == "append") | |
6594 | this->code_ = BUILTIN_APPEND; | |
6595 | else if (name == "cap") | |
6596 | this->code_ = BUILTIN_CAP; | |
6597 | else if (name == "close") | |
6598 | this->code_ = BUILTIN_CLOSE; | |
48080209 | 6599 | else if (name == "complex") |
6600 | this->code_ = BUILTIN_COMPLEX; | |
e440a328 | 6601 | else if (name == "copy") |
6602 | this->code_ = BUILTIN_COPY; | |
1cce762f | 6603 | else if (name == "delete") |
6604 | this->code_ = BUILTIN_DELETE; | |
e440a328 | 6605 | else if (name == "imag") |
6606 | this->code_ = BUILTIN_IMAG; | |
6607 | else if (name == "len") | |
6608 | this->code_ = BUILTIN_LEN; | |
6609 | else if (name == "make") | |
6610 | this->code_ = BUILTIN_MAKE; | |
6611 | else if (name == "new") | |
6612 | this->code_ = BUILTIN_NEW; | |
6613 | else if (name == "panic") | |
6614 | this->code_ = BUILTIN_PANIC; | |
6615 | else if (name == "print") | |
6616 | this->code_ = BUILTIN_PRINT; | |
6617 | else if (name == "println") | |
6618 | this->code_ = BUILTIN_PRINTLN; | |
6619 | else if (name == "real") | |
6620 | this->code_ = BUILTIN_REAL; | |
6621 | else if (name == "recover") | |
6622 | this->code_ = BUILTIN_RECOVER; | |
6623 | else if (name == "Alignof") | |
6624 | this->code_ = BUILTIN_ALIGNOF; | |
6625 | else if (name == "Offsetof") | |
6626 | this->code_ = BUILTIN_OFFSETOF; | |
6627 | else if (name == "Sizeof") | |
6628 | this->code_ = BUILTIN_SIZEOF; | |
6629 | else | |
c3e6f413 | 6630 | go_unreachable(); |
e440a328 | 6631 | } |
6632 | ||
6633 | // Return whether this is a call to recover. This is a virtual | |
6634 | // function called from the parent class. | |
6635 | ||
6636 | bool | |
6637 | Builtin_call_expression::do_is_recover_call() const | |
6638 | { | |
6639 | if (this->classification() == EXPRESSION_ERROR) | |
6640 | return false; | |
6641 | return this->code_ == BUILTIN_RECOVER; | |
6642 | } | |
6643 | ||
6644 | // Set the argument for a call to recover. | |
6645 | ||
6646 | void | |
6647 | Builtin_call_expression::do_set_recover_arg(Expression* arg) | |
6648 | { | |
6649 | const Expression_list* args = this->args(); | |
c484d925 | 6650 | go_assert(args == NULL || args->empty()); |
e440a328 | 6651 | Expression_list* new_args = new Expression_list(); |
6652 | new_args->push_back(arg); | |
6653 | this->set_args(new_args); | |
6334270b | 6654 | this->recover_arg_is_set_ = true; |
e440a328 | 6655 | } |
6656 | ||
e440a328 | 6657 | // Lower a builtin call expression. This turns new and make into |
6658 | // specific expressions. We also convert to a constant if we can. | |
6659 | ||
6660 | Expression* | |
ceeb4318 | 6661 | Builtin_call_expression::do_lower(Gogo* gogo, Named_object* function, |
6662 | Statement_inserter* inserter, int) | |
e440a328 | 6663 | { |
a9182619 | 6664 | if (this->classification() == EXPRESSION_ERROR) |
6665 | return this; | |
6666 | ||
b13c66cd | 6667 | Location loc = this->location(); |
1cce762f | 6668 | |
a8725655 | 6669 | if (this->is_varargs() && this->code_ != BUILTIN_APPEND) |
6670 | { | |
6671 | this->report_error(_("invalid use of %<...%> with builtin function")); | |
1cce762f | 6672 | return Expression::make_error(loc); |
a8725655 | 6673 | } |
6674 | ||
393ba00b | 6675 | if (this->code_ == BUILTIN_OFFSETOF) |
6676 | { | |
6677 | Expression* arg = this->one_arg(); | |
12e69faa | 6678 | |
6679 | if (arg->bound_method_expression() != NULL | |
6680 | || arg->interface_field_reference_expression() != NULL) | |
6681 | { | |
6682 | this->report_error(_("invalid use of method value as argument " | |
6683 | "of Offsetof")); | |
6684 | return this; | |
6685 | } | |
6686 | ||
393ba00b | 6687 | Field_reference_expression* farg = arg->field_reference_expression(); |
6688 | while (farg != NULL) | |
6689 | { | |
6690 | if (!farg->implicit()) | |
6691 | break; | |
6692 | // When the selector refers to an embedded field, | |
6693 | // it must not be reached through pointer indirections. | |
6694 | if (farg->expr()->deref() != farg->expr()) | |
6695 | { | |
12e69faa | 6696 | this->report_error(_("argument of Offsetof implies " |
6697 | "indirection of an embedded field")); | |
393ba00b | 6698 | return this; |
6699 | } | |
6700 | // Go up until we reach the original base. | |
6701 | farg = farg->expr()->field_reference_expression(); | |
6702 | } | |
6703 | } | |
6704 | ||
1cce762f | 6705 | if (this->is_constant()) |
e440a328 | 6706 | { |
0c77715b | 6707 | Numeric_constant nc; |
6708 | if (this->numeric_constant_value(&nc)) | |
6709 | return nc.expression(loc); | |
e440a328 | 6710 | } |
1cce762f | 6711 | |
6712 | switch (this->code_) | |
e440a328 | 6713 | { |
1cce762f | 6714 | default: |
6715 | break; | |
6716 | ||
6717 | case BUILTIN_NEW: | |
6718 | { | |
6719 | const Expression_list* args = this->args(); | |
6720 | if (args == NULL || args->size() < 1) | |
6721 | this->report_error(_("not enough arguments")); | |
6722 | else if (args->size() > 1) | |
6723 | this->report_error(_("too many arguments")); | |
6724 | else | |
6725 | { | |
6726 | Expression* arg = args->front(); | |
6727 | if (!arg->is_type_expression()) | |
6728 | { | |
6729 | error_at(arg->location(), "expected type"); | |
6730 | this->set_is_error(); | |
6731 | } | |
6732 | else | |
6733 | return Expression::make_allocation(arg->type(), loc); | |
6734 | } | |
6735 | } | |
6736 | break; | |
6737 | ||
6738 | case BUILTIN_MAKE: | |
6739 | return this->lower_make(); | |
6740 | ||
6741 | case BUILTIN_RECOVER: | |
e440a328 | 6742 | if (function != NULL) |
6743 | function->func_value()->set_calls_recover(); | |
6744 | else | |
6745 | { | |
6746 | // Calling recover outside of a function always returns the | |
6747 | // nil empty interface. | |
823c7e3d | 6748 | Type* eface = Type::make_empty_interface_type(loc); |
1cce762f | 6749 | return Expression::make_cast(eface, Expression::make_nil(loc), loc); |
e440a328 | 6750 | } |
1cce762f | 6751 | break; |
6752 | ||
6753 | case BUILTIN_APPEND: | |
6754 | { | |
6755 | // Lower the varargs. | |
6756 | const Expression_list* args = this->args(); | |
6757 | if (args == NULL || args->empty()) | |
e440a328 | 6758 | return this; |
1cce762f | 6759 | Type* slice_type = args->front()->type(); |
6760 | if (!slice_type->is_slice_type()) | |
6761 | { | |
3ff4863b | 6762 | if (slice_type->is_nil_type()) |
6763 | error_at(args->front()->location(), "use of untyped nil"); | |
6764 | else | |
6765 | error_at(args->front()->location(), | |
6766 | "argument 1 must be a slice"); | |
1cce762f | 6767 | this->set_is_error(); |
6768 | return this; | |
6769 | } | |
19fd40c3 | 6770 | Type* element_type = slice_type->array_type()->element_type(); |
6771 | this->lower_varargs(gogo, function, inserter, | |
6772 | Type::make_array_type(element_type, NULL), | |
6773 | 2); | |
1cce762f | 6774 | } |
6775 | break; | |
6776 | ||
6777 | case BUILTIN_DELETE: | |
6778 | { | |
6779 | // Lower to a runtime function call. | |
6780 | const Expression_list* args = this->args(); | |
6781 | if (args == NULL || args->size() < 2) | |
6782 | this->report_error(_("not enough arguments")); | |
6783 | else if (args->size() > 2) | |
6784 | this->report_error(_("too many arguments")); | |
6785 | else if (args->front()->type()->map_type() == NULL) | |
6786 | this->report_error(_("argument 1 must be a map")); | |
6787 | else | |
6788 | { | |
6789 | // Since this function returns no value it must appear in | |
6790 | // a statement by itself, so we don't have to worry about | |
6791 | // order of evaluation of values around it. Evaluate the | |
6792 | // map first to get order of evaluation right. | |
6793 | Map_type* mt = args->front()->type()->map_type(); | |
6794 | Temporary_statement* map_temp = | |
6795 | Statement::make_temporary(mt, args->front(), loc); | |
6796 | inserter->insert(map_temp); | |
6797 | ||
6798 | Temporary_statement* key_temp = | |
6799 | Statement::make_temporary(mt->key_type(), args->back(), loc); | |
6800 | inserter->insert(key_temp); | |
6801 | ||
6802 | Expression* e1 = Expression::make_temporary_reference(map_temp, | |
6803 | loc); | |
6804 | Expression* e2 = Expression::make_temporary_reference(key_temp, | |
6805 | loc); | |
6806 | e2 = Expression::make_unary(OPERATOR_AND, e2, loc); | |
6807 | return Runtime::make_call(Runtime::MAPDELETE, this->location(), | |
6808 | 2, e1, e2); | |
6809 | } | |
6810 | } | |
6811 | break; | |
e440a328 | 6812 | } |
6813 | ||
6814 | return this; | |
6815 | } | |
6816 | ||
35a54f17 | 6817 | // Flatten a builtin call expression. This turns the arguments of copy and |
6818 | // append into temporary expressions. | |
6819 | ||
6820 | Expression* | |
6821 | Builtin_call_expression::do_flatten(Gogo*, Named_object*, | |
6822 | Statement_inserter* inserter) | |
6823 | { | |
16cb7fec | 6824 | Location loc = this->location(); |
5bf8be8b | 6825 | if (this->is_erroneous_call()) |
6826 | { | |
6827 | go_assert(saw_errors()); | |
6828 | return Expression::make_error(loc); | |
6829 | } | |
16cb7fec | 6830 | |
6831 | switch (this->code_) | |
35a54f17 | 6832 | { |
16cb7fec | 6833 | default: |
6834 | break; | |
6835 | ||
6836 | case BUILTIN_APPEND: | |
6837 | case BUILTIN_COPY: | |
6838 | { | |
6839 | Type* at = this->args()->front()->type(); | |
6840 | for (Expression_list::iterator pa = this->args()->begin(); | |
6841 | pa != this->args()->end(); | |
6842 | ++pa) | |
6843 | { | |
6844 | if ((*pa)->is_nil_expression()) | |
6845 | { | |
6846 | Expression* nil = Expression::make_nil(loc); | |
6847 | Expression* zero = Expression::make_integer_ul(0, NULL, loc); | |
6848 | *pa = Expression::make_slice_value(at, nil, zero, zero, loc); | |
6849 | } | |
6850 | if (!(*pa)->is_variable()) | |
6851 | { | |
6852 | Temporary_statement* temp = | |
6853 | Statement::make_temporary(NULL, *pa, loc); | |
6854 | inserter->insert(temp); | |
6855 | *pa = Expression::make_temporary_reference(temp, loc); | |
6856 | } | |
6857 | } | |
6858 | } | |
6859 | break; | |
6860 | ||
6861 | case BUILTIN_PANIC: | |
35a54f17 | 6862 | for (Expression_list::iterator pa = this->args()->begin(); |
16cb7fec | 6863 | pa != this->args()->end(); |
6864 | ++pa) | |
6865 | { | |
6866 | if (!(*pa)->is_variable() && (*pa)->type()->interface_type() != NULL) | |
55e8ba6a | 6867 | { |
16cb7fec | 6868 | Temporary_statement* temp = |
6869 | Statement::make_temporary(NULL, *pa, loc); | |
6870 | inserter->insert(temp); | |
6871 | *pa = Expression::make_temporary_reference(temp, loc); | |
55e8ba6a | 6872 | } |
16cb7fec | 6873 | } |
35a54f17 | 6874 | } |
16cb7fec | 6875 | |
35a54f17 | 6876 | return this; |
6877 | } | |
6878 | ||
a9182619 | 6879 | // Lower a make expression. |
6880 | ||
6881 | Expression* | |
6882 | Builtin_call_expression::lower_make() | |
6883 | { | |
b13c66cd | 6884 | Location loc = this->location(); |
a9182619 | 6885 | |
6886 | const Expression_list* args = this->args(); | |
6887 | if (args == NULL || args->size() < 1) | |
6888 | { | |
6889 | this->report_error(_("not enough arguments")); | |
6890 | return Expression::make_error(this->location()); | |
6891 | } | |
6892 | ||
6893 | Expression_list::const_iterator parg = args->begin(); | |
6894 | ||
6895 | Expression* first_arg = *parg; | |
6896 | if (!first_arg->is_type_expression()) | |
6897 | { | |
6898 | error_at(first_arg->location(), "expected type"); | |
6899 | this->set_is_error(); | |
6900 | return Expression::make_error(this->location()); | |
6901 | } | |
6902 | Type* type = first_arg->type(); | |
6903 | ||
6904 | bool is_slice = false; | |
6905 | bool is_map = false; | |
6906 | bool is_chan = false; | |
411eb89e | 6907 | if (type->is_slice_type()) |
a9182619 | 6908 | is_slice = true; |
6909 | else if (type->map_type() != NULL) | |
6910 | is_map = true; | |
6911 | else if (type->channel_type() != NULL) | |
6912 | is_chan = true; | |
6913 | else | |
6914 | { | |
6915 | this->report_error(_("invalid type for make function")); | |
6916 | return Expression::make_error(this->location()); | |
6917 | } | |
6918 | ||
ac84c822 | 6919 | bool have_big_args = false; |
6920 | Type* uintptr_type = Type::lookup_integer_type("uintptr"); | |
6921 | int uintptr_bits = uintptr_type->integer_type()->bits(); | |
6922 | ||
f6bc81e6 | 6923 | Type_context int_context(Type::lookup_integer_type("int"), false); |
6924 | ||
a9182619 | 6925 | ++parg; |
6926 | Expression* len_arg; | |
6927 | if (parg == args->end()) | |
6928 | { | |
6929 | if (is_slice) | |
6930 | { | |
6931 | this->report_error(_("length required when allocating a slice")); | |
6932 | return Expression::make_error(this->location()); | |
6933 | } | |
e67508fa | 6934 | len_arg = Expression::make_integer_ul(0, NULL, loc); |
a9182619 | 6935 | } |
6936 | else | |
6937 | { | |
6938 | len_arg = *parg; | |
f6bc81e6 | 6939 | len_arg->determine_type(&int_context); |
1ad00fd4 | 6940 | if (!this->check_int_value(len_arg, true)) |
6941 | return Expression::make_error(this->location()); | |
ac84c822 | 6942 | if (len_arg->type()->integer_type() != NULL |
6943 | && len_arg->type()->integer_type()->bits() > uintptr_bits) | |
6944 | have_big_args = true; | |
a9182619 | 6945 | ++parg; |
6946 | } | |
6947 | ||
6948 | Expression* cap_arg = NULL; | |
6949 | if (is_slice && parg != args->end()) | |
6950 | { | |
6951 | cap_arg = *parg; | |
f6bc81e6 | 6952 | cap_arg->determine_type(&int_context); |
1ad00fd4 | 6953 | if (!this->check_int_value(cap_arg, false)) |
6954 | return Expression::make_error(this->location()); | |
6955 | ||
6956 | Numeric_constant nclen; | |
6957 | Numeric_constant nccap; | |
6958 | unsigned long vlen; | |
6959 | unsigned long vcap; | |
6960 | if (len_arg->numeric_constant_value(&nclen) | |
6961 | && cap_arg->numeric_constant_value(&nccap) | |
6962 | && nclen.to_unsigned_long(&vlen) == Numeric_constant::NC_UL_VALID | |
6963 | && nccap.to_unsigned_long(&vcap) == Numeric_constant::NC_UL_VALID | |
6964 | && vlen > vcap) | |
a9182619 | 6965 | { |
1ad00fd4 | 6966 | this->report_error(_("len larger than cap")); |
a9182619 | 6967 | return Expression::make_error(this->location()); |
6968 | } | |
1ad00fd4 | 6969 | |
ac84c822 | 6970 | if (cap_arg->type()->integer_type() != NULL |
6971 | && cap_arg->type()->integer_type()->bits() > uintptr_bits) | |
6972 | have_big_args = true; | |
a9182619 | 6973 | ++parg; |
6974 | } | |
6975 | ||
6976 | if (parg != args->end()) | |
6977 | { | |
6978 | this->report_error(_("too many arguments to make")); | |
6979 | return Expression::make_error(this->location()); | |
6980 | } | |
6981 | ||
b13c66cd | 6982 | Location type_loc = first_arg->location(); |
a9182619 | 6983 | Expression* type_arg; |
6984 | if (is_slice || is_chan) | |
6985 | type_arg = Expression::make_type_descriptor(type, type_loc); | |
6986 | else if (is_map) | |
6987 | type_arg = Expression::make_map_descriptor(type->map_type(), type_loc); | |
6988 | else | |
6989 | go_unreachable(); | |
6990 | ||
6991 | Expression* call; | |
6992 | if (is_slice) | |
6993 | { | |
6994 | if (cap_arg == NULL) | |
ac84c822 | 6995 | call = Runtime::make_call((have_big_args |
6996 | ? Runtime::MAKESLICE1BIG | |
6997 | : Runtime::MAKESLICE1), | |
6998 | loc, 2, type_arg, len_arg); | |
a9182619 | 6999 | else |
ac84c822 | 7000 | call = Runtime::make_call((have_big_args |
7001 | ? Runtime::MAKESLICE2BIG | |
7002 | : Runtime::MAKESLICE2), | |
7003 | loc, 3, type_arg, len_arg, cap_arg); | |
a9182619 | 7004 | } |
7005 | else if (is_map) | |
ac84c822 | 7006 | call = Runtime::make_call((have_big_args |
7007 | ? Runtime::MAKEMAPBIG | |
7008 | : Runtime::MAKEMAP), | |
7009 | loc, 2, type_arg, len_arg); | |
a9182619 | 7010 | else if (is_chan) |
ac84c822 | 7011 | call = Runtime::make_call((have_big_args |
7012 | ? Runtime::MAKECHANBIG | |
7013 | : Runtime::MAKECHAN), | |
7014 | loc, 2, type_arg, len_arg); | |
a9182619 | 7015 | else |
7016 | go_unreachable(); | |
7017 | ||
7018 | return Expression::make_unsafe_cast(type, call, loc); | |
7019 | } | |
7020 | ||
7021 | // Return whether an expression has an integer value. Report an error | |
7022 | // if not. This is used when handling calls to the predeclared make | |
7023 | // function. | |
7024 | ||
7025 | bool | |
1ad00fd4 | 7026 | Builtin_call_expression::check_int_value(Expression* e, bool is_length) |
a9182619 | 7027 | { |
0c77715b | 7028 | Numeric_constant nc; |
1ad00fd4 | 7029 | if (e->numeric_constant_value(&nc)) |
a9182619 | 7030 | { |
1ad00fd4 | 7031 | unsigned long v; |
7032 | switch (nc.to_unsigned_long(&v)) | |
7033 | { | |
7034 | case Numeric_constant::NC_UL_VALID: | |
1b10c5e7 | 7035 | break; |
1ad00fd4 | 7036 | case Numeric_constant::NC_UL_NOTINT: |
7037 | error_at(e->location(), "non-integer %s argument to make", | |
7038 | is_length ? "len" : "cap"); | |
7039 | return false; | |
7040 | case Numeric_constant::NC_UL_NEGATIVE: | |
7041 | error_at(e->location(), "negative %s argument to make", | |
7042 | is_length ? "len" : "cap"); | |
7043 | return false; | |
7044 | case Numeric_constant::NC_UL_BIG: | |
7045 | // We don't want to give a compile-time error for a 64-bit | |
7046 | // value on a 32-bit target. | |
1b10c5e7 | 7047 | break; |
1ad00fd4 | 7048 | } |
1b10c5e7 | 7049 | |
7050 | mpz_t val; | |
7051 | if (!nc.to_int(&val)) | |
7052 | go_unreachable(); | |
7053 | int bits = mpz_sizeinbase(val, 2); | |
7054 | mpz_clear(val); | |
7055 | Type* int_type = Type::lookup_integer_type("int"); | |
7056 | if (bits >= int_type->integer_type()->bits()) | |
7057 | { | |
7058 | error_at(e->location(), "%s argument too large for make", | |
7059 | is_length ? "len" : "cap"); | |
7060 | return false; | |
7061 | } | |
7062 | ||
7063 | return true; | |
a9182619 | 7064 | } |
7065 | ||
1ad00fd4 | 7066 | if (e->type()->integer_type() != NULL) |
7067 | return true; | |
7068 | ||
7069 | error_at(e->location(), "non-integer %s argument to make", | |
7070 | is_length ? "len" : "cap"); | |
a9182619 | 7071 | return false; |
7072 | } | |
7073 | ||
e440a328 | 7074 | // Return the type of the real or imag functions, given the type of |
fcbea5e4 | 7075 | // the argument. We need to map complex64 to float32 and complex128 |
7076 | // to float64, so it has to be done by name. This returns NULL if it | |
7077 | // can't figure out the type. | |
e440a328 | 7078 | |
7079 | Type* | |
7080 | Builtin_call_expression::real_imag_type(Type* arg_type) | |
7081 | { | |
7082 | if (arg_type == NULL || arg_type->is_abstract()) | |
7083 | return NULL; | |
7084 | Named_type* nt = arg_type->named_type(); | |
7085 | if (nt == NULL) | |
7086 | return NULL; | |
7087 | while (nt->real_type()->named_type() != NULL) | |
7088 | nt = nt->real_type()->named_type(); | |
48080209 | 7089 | if (nt->name() == "complex64") |
e440a328 | 7090 | return Type::lookup_float_type("float32"); |
7091 | else if (nt->name() == "complex128") | |
7092 | return Type::lookup_float_type("float64"); | |
7093 | else | |
7094 | return NULL; | |
7095 | } | |
7096 | ||
48080209 | 7097 | // Return the type of the complex function, given the type of one of the |
e440a328 | 7098 | // argments. Like real_imag_type, we have to map by name. |
7099 | ||
7100 | Type* | |
48080209 | 7101 | Builtin_call_expression::complex_type(Type* arg_type) |
e440a328 | 7102 | { |
7103 | if (arg_type == NULL || arg_type->is_abstract()) | |
7104 | return NULL; | |
7105 | Named_type* nt = arg_type->named_type(); | |
7106 | if (nt == NULL) | |
7107 | return NULL; | |
7108 | while (nt->real_type()->named_type() != NULL) | |
7109 | nt = nt->real_type()->named_type(); | |
48080209 | 7110 | if (nt->name() == "float32") |
e440a328 | 7111 | return Type::lookup_complex_type("complex64"); |
7112 | else if (nt->name() == "float64") | |
7113 | return Type::lookup_complex_type("complex128"); | |
7114 | else | |
7115 | return NULL; | |
7116 | } | |
7117 | ||
7118 | // Return a single argument, or NULL if there isn't one. | |
7119 | ||
7120 | Expression* | |
7121 | Builtin_call_expression::one_arg() const | |
7122 | { | |
7123 | const Expression_list* args = this->args(); | |
aa615cb3 | 7124 | if (args == NULL || args->size() != 1) |
e440a328 | 7125 | return NULL; |
7126 | return args->front(); | |
7127 | } | |
7128 | ||
83921647 | 7129 | // A traversal class which looks for a call or receive expression. |
7130 | ||
7131 | class Find_call_expression : public Traverse | |
7132 | { | |
7133 | public: | |
7134 | Find_call_expression() | |
7135 | : Traverse(traverse_expressions), | |
7136 | found_(false) | |
7137 | { } | |
7138 | ||
7139 | int | |
7140 | expression(Expression**); | |
7141 | ||
7142 | bool | |
7143 | found() | |
7144 | { return this->found_; } | |
7145 | ||
7146 | private: | |
7147 | bool found_; | |
7148 | }; | |
7149 | ||
7150 | int | |
7151 | Find_call_expression::expression(Expression** pexpr) | |
7152 | { | |
7153 | if ((*pexpr)->call_expression() != NULL | |
7154 | || (*pexpr)->receive_expression() != NULL) | |
7155 | { | |
7156 | this->found_ = true; | |
7157 | return TRAVERSE_EXIT; | |
7158 | } | |
7159 | return TRAVERSE_CONTINUE; | |
7160 | } | |
7161 | ||
7162 | // Return whether this is constant: len of a string constant, or len | |
7163 | // or cap of an array, or unsafe.Sizeof, unsafe.Offsetof, | |
7164 | // unsafe.Alignof. | |
e440a328 | 7165 | |
7166 | bool | |
7167 | Builtin_call_expression::do_is_constant() const | |
7168 | { | |
12e69faa | 7169 | if (this->is_error_expression()) |
7170 | return true; | |
e440a328 | 7171 | switch (this->code_) |
7172 | { | |
7173 | case BUILTIN_LEN: | |
7174 | case BUILTIN_CAP: | |
7175 | { | |
0f914071 | 7176 | if (this->seen_) |
7177 | return false; | |
7178 | ||
e440a328 | 7179 | Expression* arg = this->one_arg(); |
7180 | if (arg == NULL) | |
7181 | return false; | |
7182 | Type* arg_type = arg->type(); | |
7183 | ||
7184 | if (arg_type->points_to() != NULL | |
7185 | && arg_type->points_to()->array_type() != NULL | |
411eb89e | 7186 | && !arg_type->points_to()->is_slice_type()) |
e440a328 | 7187 | arg_type = arg_type->points_to(); |
7188 | ||
83921647 | 7189 | // The len and cap functions are only constant if there are no |
7190 | // function calls or channel operations in the arguments. | |
7191 | // Otherwise we have to make the call. | |
7192 | if (!arg->is_constant()) | |
7193 | { | |
7194 | Find_call_expression find_call; | |
7195 | Expression::traverse(&arg, &find_call); | |
7196 | if (find_call.found()) | |
7197 | return false; | |
7198 | } | |
7199 | ||
e440a328 | 7200 | if (arg_type->array_type() != NULL |
7201 | && arg_type->array_type()->length() != NULL) | |
0f914071 | 7202 | return true; |
e440a328 | 7203 | |
7204 | if (this->code_ == BUILTIN_LEN && arg_type->is_string_type()) | |
0f914071 | 7205 | { |
7206 | this->seen_ = true; | |
7207 | bool ret = arg->is_constant(); | |
7208 | this->seen_ = false; | |
7209 | return ret; | |
7210 | } | |
e440a328 | 7211 | } |
7212 | break; | |
7213 | ||
7214 | case BUILTIN_SIZEOF: | |
7215 | case BUILTIN_ALIGNOF: | |
7216 | return this->one_arg() != NULL; | |
7217 | ||
7218 | case BUILTIN_OFFSETOF: | |
7219 | { | |
7220 | Expression* arg = this->one_arg(); | |
7221 | if (arg == NULL) | |
7222 | return false; | |
7223 | return arg->field_reference_expression() != NULL; | |
7224 | } | |
7225 | ||
48080209 | 7226 | case BUILTIN_COMPLEX: |
e440a328 | 7227 | { |
7228 | const Expression_list* args = this->args(); | |
7229 | if (args != NULL && args->size() == 2) | |
7230 | return args->front()->is_constant() && args->back()->is_constant(); | |
7231 | } | |
7232 | break; | |
7233 | ||
7234 | case BUILTIN_REAL: | |
7235 | case BUILTIN_IMAG: | |
7236 | { | |
7237 | Expression* arg = this->one_arg(); | |
7238 | return arg != NULL && arg->is_constant(); | |
7239 | } | |
7240 | ||
7241 | default: | |
7242 | break; | |
7243 | } | |
7244 | ||
7245 | return false; | |
7246 | } | |
7247 | ||
0c77715b | 7248 | // Return a numeric constant if possible. |
e440a328 | 7249 | |
7250 | bool | |
0c77715b | 7251 | Builtin_call_expression::do_numeric_constant_value(Numeric_constant* nc) const |
e440a328 | 7252 | { |
7253 | if (this->code_ == BUILTIN_LEN | |
7254 | || this->code_ == BUILTIN_CAP) | |
7255 | { | |
7256 | Expression* arg = this->one_arg(); | |
7257 | if (arg == NULL) | |
7258 | return false; | |
7259 | Type* arg_type = arg->type(); | |
7260 | ||
7261 | if (this->code_ == BUILTIN_LEN && arg_type->is_string_type()) | |
7262 | { | |
7263 | std::string sval; | |
7264 | if (arg->string_constant_value(&sval)) | |
7265 | { | |
0c77715b | 7266 | nc->set_unsigned_long(Type::lookup_integer_type("int"), |
7267 | sval.length()); | |
e440a328 | 7268 | return true; |
7269 | } | |
7270 | } | |
7271 | ||
7272 | if (arg_type->points_to() != NULL | |
7273 | && arg_type->points_to()->array_type() != NULL | |
411eb89e | 7274 | && !arg_type->points_to()->is_slice_type()) |
e440a328 | 7275 | arg_type = arg_type->points_to(); |
7276 | ||
7277 | if (arg_type->array_type() != NULL | |
7278 | && arg_type->array_type()->length() != NULL) | |
7279 | { | |
0f914071 | 7280 | if (this->seen_) |
7281 | return false; | |
e440a328 | 7282 | Expression* e = arg_type->array_type()->length(); |
0f914071 | 7283 | this->seen_ = true; |
0c77715b | 7284 | bool r = e->numeric_constant_value(nc); |
0f914071 | 7285 | this->seen_ = false; |
7286 | if (r) | |
e440a328 | 7287 | { |
0c77715b | 7288 | if (!nc->set_type(Type::lookup_integer_type("int"), false, |
7289 | this->location())) | |
7290 | r = false; | |
e440a328 | 7291 | } |
0c77715b | 7292 | return r; |
e440a328 | 7293 | } |
7294 | } | |
7295 | else if (this->code_ == BUILTIN_SIZEOF | |
7296 | || this->code_ == BUILTIN_ALIGNOF) | |
7297 | { | |
7298 | Expression* arg = this->one_arg(); | |
7299 | if (arg == NULL) | |
7300 | return false; | |
7301 | Type* arg_type = arg->type(); | |
5c13bd80 | 7302 | if (arg_type->is_error()) |
e440a328 | 7303 | return false; |
7304 | if (arg_type->is_abstract()) | |
7305 | return false; | |
2c809f8f | 7306 | if (this->seen_) |
7307 | return false; | |
927a01eb | 7308 | |
3f378015 | 7309 | int64_t ret; |
e440a328 | 7310 | if (this->code_ == BUILTIN_SIZEOF) |
7311 | { | |
2c809f8f | 7312 | this->seen_ = true; |
7313 | bool ok = arg_type->backend_type_size(this->gogo_, &ret); | |
7314 | this->seen_ = false; | |
7315 | if (!ok) | |
e440a328 | 7316 | return false; |
7317 | } | |
7318 | else if (this->code_ == BUILTIN_ALIGNOF) | |
7319 | { | |
2c809f8f | 7320 | bool ok; |
7321 | this->seen_ = true; | |
637bd3af | 7322 | if (arg->field_reference_expression() == NULL) |
2c809f8f | 7323 | ok = arg_type->backend_type_align(this->gogo_, &ret); |
637bd3af | 7324 | else |
e440a328 | 7325 | { |
7326 | // Calling unsafe.Alignof(s.f) returns the alignment of | |
7327 | // the type of f when it is used as a field in a struct. | |
2c809f8f | 7328 | ok = arg_type->backend_type_field_align(this->gogo_, &ret); |
e440a328 | 7329 | } |
2c809f8f | 7330 | this->seen_ = false; |
7331 | if (!ok) | |
7332 | return false; | |
e440a328 | 7333 | } |
7334 | else | |
c3e6f413 | 7335 | go_unreachable(); |
927a01eb | 7336 | |
3f378015 | 7337 | mpz_t zval; |
7338 | set_mpz_from_int64(&zval, ret); | |
7339 | nc->set_int(Type::lookup_integer_type("uintptr"), zval); | |
7340 | mpz_clear(zval); | |
e440a328 | 7341 | return true; |
7342 | } | |
7343 | else if (this->code_ == BUILTIN_OFFSETOF) | |
7344 | { | |
7345 | Expression* arg = this->one_arg(); | |
7346 | if (arg == NULL) | |
7347 | return false; | |
7348 | Field_reference_expression* farg = arg->field_reference_expression(); | |
7349 | if (farg == NULL) | |
7350 | return false; | |
2c809f8f | 7351 | if (this->seen_) |
7352 | return false; | |
7353 | ||
3f378015 | 7354 | int64_t total_offset = 0; |
9a4bd570 | 7355 | while (true) |
7356 | { | |
7357 | Expression* struct_expr = farg->expr(); | |
7358 | Type* st = struct_expr->type(); | |
7359 | if (st->struct_type() == NULL) | |
7360 | return false; | |
7361 | if (st->named_type() != NULL) | |
7362 | st->named_type()->convert(this->gogo_); | |
3f378015 | 7363 | int64_t offset; |
2c809f8f | 7364 | this->seen_ = true; |
7365 | bool ok = st->struct_type()->backend_field_offset(this->gogo_, | |
7366 | farg->field_index(), | |
7367 | &offset); | |
7368 | this->seen_ = false; | |
7369 | if (!ok) | |
7370 | return false; | |
9a4bd570 | 7371 | total_offset += offset; |
7372 | if (farg->implicit() && struct_expr->field_reference_expression() != NULL) | |
7373 | { | |
7374 | // Go up until we reach the original base. | |
7375 | farg = struct_expr->field_reference_expression(); | |
7376 | continue; | |
7377 | } | |
7378 | break; | |
7379 | } | |
3f378015 | 7380 | mpz_t zval; |
7381 | set_mpz_from_int64(&zval, total_offset); | |
7382 | nc->set_int(Type::lookup_integer_type("uintptr"), zval); | |
7383 | mpz_clear(zval); | |
e440a328 | 7384 | return true; |
7385 | } | |
0c77715b | 7386 | else if (this->code_ == BUILTIN_REAL || this->code_ == BUILTIN_IMAG) |
e440a328 | 7387 | { |
7388 | Expression* arg = this->one_arg(); | |
7389 | if (arg == NULL) | |
7390 | return false; | |
7391 | ||
0c77715b | 7392 | Numeric_constant argnc; |
7393 | if (!arg->numeric_constant_value(&argnc)) | |
7394 | return false; | |
7395 | ||
fcbea5e4 | 7396 | mpc_t val; |
7397 | if (!argnc.to_complex(&val)) | |
0c77715b | 7398 | return false; |
e440a328 | 7399 | |
0c77715b | 7400 | Type* type = Builtin_call_expression::real_imag_type(argnc.type()); |
7401 | if (this->code_ == BUILTIN_REAL) | |
fcbea5e4 | 7402 | nc->set_float(type, mpc_realref(val)); |
0c77715b | 7403 | else |
fcbea5e4 | 7404 | nc->set_float(type, mpc_imagref(val)); |
7405 | mpc_clear(val); | |
0c77715b | 7406 | return true; |
e440a328 | 7407 | } |
0c77715b | 7408 | else if (this->code_ == BUILTIN_COMPLEX) |
e440a328 | 7409 | { |
7410 | const Expression_list* args = this->args(); | |
7411 | if (args == NULL || args->size() != 2) | |
7412 | return false; | |
7413 | ||
0c77715b | 7414 | Numeric_constant rnc; |
7415 | if (!args->front()->numeric_constant_value(&rnc)) | |
7416 | return false; | |
7417 | Numeric_constant inc; | |
7418 | if (!args->back()->numeric_constant_value(&inc)) | |
7419 | return false; | |
7420 | ||
7421 | if (rnc.type() != NULL | |
7422 | && !rnc.type()->is_abstract() | |
7423 | && inc.type() != NULL | |
7424 | && !inc.type()->is_abstract() | |
7425 | && !Type::are_identical(rnc.type(), inc.type(), false, NULL)) | |
7426 | return false; | |
7427 | ||
e440a328 | 7428 | mpfr_t r; |
0c77715b | 7429 | if (!rnc.to_float(&r)) |
7430 | return false; | |
7431 | mpfr_t i; | |
7432 | if (!inc.to_float(&i)) | |
e440a328 | 7433 | { |
7434 | mpfr_clear(r); | |
7435 | return false; | |
7436 | } | |
7437 | ||
0c77715b | 7438 | Type* arg_type = rnc.type(); |
7439 | if (arg_type == NULL || arg_type->is_abstract()) | |
7440 | arg_type = inc.type(); | |
e440a328 | 7441 | |
fcbea5e4 | 7442 | mpc_t val; |
7443 | mpc_init2(val, mpc_precision); | |
7444 | mpc_set_fr_fr(val, r, i, MPC_RNDNN); | |
e440a328 | 7445 | mpfr_clear(r); |
7446 | mpfr_clear(i); | |
7447 | ||
fcbea5e4 | 7448 | Type* type = Builtin_call_expression::complex_type(arg_type); |
7449 | nc->set_complex(type, val); | |
7450 | ||
7451 | mpc_clear(val); | |
7452 | ||
0c77715b | 7453 | return true; |
e440a328 | 7454 | } |
7455 | ||
7456 | return false; | |
7457 | } | |
7458 | ||
a7549a6a | 7459 | // Give an error if we are discarding the value of an expression which |
7460 | // should not normally be discarded. We don't give an error for | |
7461 | // discarding the value of an ordinary function call, but we do for | |
7462 | // builtin functions, purely for consistency with the gc compiler. | |
7463 | ||
4f2138d7 | 7464 | bool |
a7549a6a | 7465 | Builtin_call_expression::do_discarding_value() |
7466 | { | |
7467 | switch (this->code_) | |
7468 | { | |
7469 | case BUILTIN_INVALID: | |
7470 | default: | |
7471 | go_unreachable(); | |
7472 | ||
7473 | case BUILTIN_APPEND: | |
7474 | case BUILTIN_CAP: | |
7475 | case BUILTIN_COMPLEX: | |
7476 | case BUILTIN_IMAG: | |
7477 | case BUILTIN_LEN: | |
7478 | case BUILTIN_MAKE: | |
7479 | case BUILTIN_NEW: | |
7480 | case BUILTIN_REAL: | |
7481 | case BUILTIN_ALIGNOF: | |
7482 | case BUILTIN_OFFSETOF: | |
7483 | case BUILTIN_SIZEOF: | |
7484 | this->unused_value_error(); | |
4f2138d7 | 7485 | return false; |
a7549a6a | 7486 | |
7487 | case BUILTIN_CLOSE: | |
7488 | case BUILTIN_COPY: | |
1cce762f | 7489 | case BUILTIN_DELETE: |
a7549a6a | 7490 | case BUILTIN_PANIC: |
7491 | case BUILTIN_PRINT: | |
7492 | case BUILTIN_PRINTLN: | |
7493 | case BUILTIN_RECOVER: | |
4f2138d7 | 7494 | return true; |
a7549a6a | 7495 | } |
7496 | } | |
7497 | ||
e440a328 | 7498 | // Return the type. |
7499 | ||
7500 | Type* | |
7501 | Builtin_call_expression::do_type() | |
7502 | { | |
7503 | switch (this->code_) | |
7504 | { | |
7505 | case BUILTIN_INVALID: | |
7506 | default: | |
c3e6f413 | 7507 | go_unreachable(); |
e440a328 | 7508 | |
7509 | case BUILTIN_NEW: | |
7510 | case BUILTIN_MAKE: | |
7511 | { | |
7512 | const Expression_list* args = this->args(); | |
7513 | if (args == NULL || args->empty()) | |
7514 | return Type::make_error_type(); | |
7515 | return Type::make_pointer_type(args->front()->type()); | |
7516 | } | |
7517 | ||
7518 | case BUILTIN_CAP: | |
7519 | case BUILTIN_COPY: | |
7520 | case BUILTIN_LEN: | |
7ba86326 | 7521 | return Type::lookup_integer_type("int"); |
7522 | ||
e440a328 | 7523 | case BUILTIN_ALIGNOF: |
7524 | case BUILTIN_OFFSETOF: | |
7525 | case BUILTIN_SIZEOF: | |
7ba86326 | 7526 | return Type::lookup_integer_type("uintptr"); |
e440a328 | 7527 | |
7528 | case BUILTIN_CLOSE: | |
1cce762f | 7529 | case BUILTIN_DELETE: |
e440a328 | 7530 | case BUILTIN_PANIC: |
7531 | case BUILTIN_PRINT: | |
7532 | case BUILTIN_PRINTLN: | |
7533 | return Type::make_void_type(); | |
7534 | ||
e440a328 | 7535 | case BUILTIN_RECOVER: |
823c7e3d | 7536 | return Type::make_empty_interface_type(Linemap::predeclared_location()); |
e440a328 | 7537 | |
7538 | case BUILTIN_APPEND: | |
7539 | { | |
7540 | const Expression_list* args = this->args(); | |
7541 | if (args == NULL || args->empty()) | |
7542 | return Type::make_error_type(); | |
3ff4863b | 7543 | Type *ret = args->front()->type(); |
7544 | if (!ret->is_slice_type()) | |
7545 | return Type::make_error_type(); | |
7546 | return ret; | |
e440a328 | 7547 | } |
7548 | ||
7549 | case BUILTIN_REAL: | |
7550 | case BUILTIN_IMAG: | |
7551 | { | |
7552 | Expression* arg = this->one_arg(); | |
7553 | if (arg == NULL) | |
7554 | return Type::make_error_type(); | |
7555 | Type* t = arg->type(); | |
7556 | if (t->is_abstract()) | |
7557 | t = t->make_non_abstract_type(); | |
7558 | t = Builtin_call_expression::real_imag_type(t); | |
7559 | if (t == NULL) | |
7560 | t = Type::make_error_type(); | |
7561 | return t; | |
7562 | } | |
7563 | ||
48080209 | 7564 | case BUILTIN_COMPLEX: |
e440a328 | 7565 | { |
7566 | const Expression_list* args = this->args(); | |
7567 | if (args == NULL || args->size() != 2) | |
7568 | return Type::make_error_type(); | |
7569 | Type* t = args->front()->type(); | |
7570 | if (t->is_abstract()) | |
7571 | { | |
7572 | t = args->back()->type(); | |
7573 | if (t->is_abstract()) | |
7574 | t = t->make_non_abstract_type(); | |
7575 | } | |
48080209 | 7576 | t = Builtin_call_expression::complex_type(t); |
e440a328 | 7577 | if (t == NULL) |
7578 | t = Type::make_error_type(); | |
7579 | return t; | |
7580 | } | |
7581 | } | |
7582 | } | |
7583 | ||
7584 | // Determine the type. | |
7585 | ||
7586 | void | |
7587 | Builtin_call_expression::do_determine_type(const Type_context* context) | |
7588 | { | |
fb94b0ca | 7589 | if (!this->determining_types()) |
7590 | return; | |
7591 | ||
e440a328 | 7592 | this->fn()->determine_type_no_context(); |
7593 | ||
7594 | const Expression_list* args = this->args(); | |
7595 | ||
7596 | bool is_print; | |
7597 | Type* arg_type = NULL; | |
7598 | switch (this->code_) | |
7599 | { | |
7600 | case BUILTIN_PRINT: | |
7601 | case BUILTIN_PRINTLN: | |
7602 | // Do not force a large integer constant to "int". | |
7603 | is_print = true; | |
7604 | break; | |
7605 | ||
7606 | case BUILTIN_REAL: | |
7607 | case BUILTIN_IMAG: | |
48080209 | 7608 | arg_type = Builtin_call_expression::complex_type(context->type); |
f6bc81e6 | 7609 | if (arg_type == NULL) |
7610 | arg_type = Type::lookup_complex_type("complex128"); | |
e440a328 | 7611 | is_print = false; |
7612 | break; | |
7613 | ||
48080209 | 7614 | case BUILTIN_COMPLEX: |
e440a328 | 7615 | { |
48080209 | 7616 | // For the complex function the type of one operand can |
e440a328 | 7617 | // determine the type of the other, as in a binary expression. |
7618 | arg_type = Builtin_call_expression::real_imag_type(context->type); | |
f6bc81e6 | 7619 | if (arg_type == NULL) |
7620 | arg_type = Type::lookup_float_type("float64"); | |
e440a328 | 7621 | if (args != NULL && args->size() == 2) |
7622 | { | |
7623 | Type* t1 = args->front()->type(); | |
c849bb59 | 7624 | Type* t2 = args->back()->type(); |
e440a328 | 7625 | if (!t1->is_abstract()) |
7626 | arg_type = t1; | |
7627 | else if (!t2->is_abstract()) | |
7628 | arg_type = t2; | |
7629 | } | |
7630 | is_print = false; | |
7631 | } | |
7632 | break; | |
7633 | ||
7634 | default: | |
7635 | is_print = false; | |
7636 | break; | |
7637 | } | |
7638 | ||
7639 | if (args != NULL) | |
7640 | { | |
7641 | for (Expression_list::const_iterator pa = args->begin(); | |
7642 | pa != args->end(); | |
7643 | ++pa) | |
7644 | { | |
7645 | Type_context subcontext; | |
7646 | subcontext.type = arg_type; | |
7647 | ||
7648 | if (is_print) | |
7649 | { | |
7650 | // We want to print large constants, we so can't just | |
7651 | // use the appropriate nonabstract type. Use uint64 for | |
7652 | // an integer if we know it is nonnegative, otherwise | |
7653 | // use int64 for a integer, otherwise use float64 for a | |
7654 | // float or complex128 for a complex. | |
7655 | Type* want_type = NULL; | |
7656 | Type* atype = (*pa)->type(); | |
7657 | if (atype->is_abstract()) | |
7658 | { | |
7659 | if (atype->integer_type() != NULL) | |
7660 | { | |
0c77715b | 7661 | Numeric_constant nc; |
7662 | if (this->numeric_constant_value(&nc)) | |
7663 | { | |
7664 | mpz_t val; | |
7665 | if (nc.to_int(&val)) | |
7666 | { | |
7667 | if (mpz_sgn(val) >= 0) | |
7668 | want_type = Type::lookup_integer_type("uint64"); | |
7669 | mpz_clear(val); | |
7670 | } | |
7671 | } | |
7672 | if (want_type == NULL) | |
e440a328 | 7673 | want_type = Type::lookup_integer_type("int64"); |
e440a328 | 7674 | } |
7675 | else if (atype->float_type() != NULL) | |
7676 | want_type = Type::lookup_float_type("float64"); | |
7677 | else if (atype->complex_type() != NULL) | |
7678 | want_type = Type::lookup_complex_type("complex128"); | |
7679 | else if (atype->is_abstract_string_type()) | |
7680 | want_type = Type::lookup_string_type(); | |
7681 | else if (atype->is_abstract_boolean_type()) | |
7682 | want_type = Type::lookup_bool_type(); | |
7683 | else | |
c3e6f413 | 7684 | go_unreachable(); |
e440a328 | 7685 | subcontext.type = want_type; |
7686 | } | |
7687 | } | |
7688 | ||
7689 | (*pa)->determine_type(&subcontext); | |
7690 | } | |
7691 | } | |
7692 | } | |
7693 | ||
7694 | // If there is exactly one argument, return true. Otherwise give an | |
7695 | // error message and return false. | |
7696 | ||
7697 | bool | |
7698 | Builtin_call_expression::check_one_arg() | |
7699 | { | |
7700 | const Expression_list* args = this->args(); | |
7701 | if (args == NULL || args->size() < 1) | |
7702 | { | |
7703 | this->report_error(_("not enough arguments")); | |
7704 | return false; | |
7705 | } | |
7706 | else if (args->size() > 1) | |
7707 | { | |
7708 | this->report_error(_("too many arguments")); | |
7709 | return false; | |
7710 | } | |
7711 | if (args->front()->is_error_expression() | |
5c13bd80 | 7712 | || args->front()->type()->is_error()) |
e440a328 | 7713 | { |
7714 | this->set_is_error(); | |
7715 | return false; | |
7716 | } | |
7717 | return true; | |
7718 | } | |
7719 | ||
7720 | // Check argument types for a builtin function. | |
7721 | ||
7722 | void | |
7723 | Builtin_call_expression::do_check_types(Gogo*) | |
7724 | { | |
375646ea | 7725 | if (this->is_error_expression()) |
7726 | return; | |
e440a328 | 7727 | switch (this->code_) |
7728 | { | |
7729 | case BUILTIN_INVALID: | |
7730 | case BUILTIN_NEW: | |
7731 | case BUILTIN_MAKE: | |
cd238b8d | 7732 | case BUILTIN_DELETE: |
e440a328 | 7733 | return; |
7734 | ||
7735 | case BUILTIN_LEN: | |
7736 | case BUILTIN_CAP: | |
7737 | { | |
7738 | // The single argument may be either a string or an array or a | |
7739 | // map or a channel, or a pointer to a closed array. | |
7740 | if (this->check_one_arg()) | |
7741 | { | |
7742 | Type* arg_type = this->one_arg()->type(); | |
7743 | if (arg_type->points_to() != NULL | |
7744 | && arg_type->points_to()->array_type() != NULL | |
411eb89e | 7745 | && !arg_type->points_to()->is_slice_type()) |
e440a328 | 7746 | arg_type = arg_type->points_to(); |
7747 | if (this->code_ == BUILTIN_CAP) | |
7748 | { | |
5c13bd80 | 7749 | if (!arg_type->is_error() |
e440a328 | 7750 | && arg_type->array_type() == NULL |
7751 | && arg_type->channel_type() == NULL) | |
7752 | this->report_error(_("argument must be array or slice " | |
7753 | "or channel")); | |
7754 | } | |
7755 | else | |
7756 | { | |
5c13bd80 | 7757 | if (!arg_type->is_error() |
e440a328 | 7758 | && !arg_type->is_string_type() |
7759 | && arg_type->array_type() == NULL | |
7760 | && arg_type->map_type() == NULL | |
7761 | && arg_type->channel_type() == NULL) | |
7762 | this->report_error(_("argument must be string or " | |
7763 | "array or slice or map or channel")); | |
7764 | } | |
7765 | } | |
7766 | } | |
7767 | break; | |
7768 | ||
7769 | case BUILTIN_PRINT: | |
7770 | case BUILTIN_PRINTLN: | |
7771 | { | |
7772 | const Expression_list* args = this->args(); | |
7773 | if (args == NULL) | |
7774 | { | |
7775 | if (this->code_ == BUILTIN_PRINT) | |
7776 | warning_at(this->location(), 0, | |
7777 | "no arguments for builtin function %<%s%>", | |
7778 | (this->code_ == BUILTIN_PRINT | |
7779 | ? "print" | |
7780 | : "println")); | |
7781 | } | |
7782 | else | |
7783 | { | |
7784 | for (Expression_list::const_iterator p = args->begin(); | |
7785 | p != args->end(); | |
7786 | ++p) | |
7787 | { | |
7788 | Type* type = (*p)->type(); | |
5c13bd80 | 7789 | if (type->is_error() |
e440a328 | 7790 | || type->is_string_type() |
7791 | || type->integer_type() != NULL | |
7792 | || type->float_type() != NULL | |
7793 | || type->complex_type() != NULL | |
7794 | || type->is_boolean_type() | |
7795 | || type->points_to() != NULL | |
7796 | || type->interface_type() != NULL | |
7797 | || type->channel_type() != NULL | |
7798 | || type->map_type() != NULL | |
7799 | || type->function_type() != NULL | |
411eb89e | 7800 | || type->is_slice_type()) |
e440a328 | 7801 | ; |
acf8e158 | 7802 | else if ((*p)->is_type_expression()) |
7803 | { | |
7804 | // If this is a type expression it's going to give | |
7805 | // an error anyhow, so we don't need one here. | |
7806 | } | |
e440a328 | 7807 | else |
7808 | this->report_error(_("unsupported argument type to " | |
7809 | "builtin function")); | |
7810 | } | |
7811 | } | |
7812 | } | |
7813 | break; | |
7814 | ||
7815 | case BUILTIN_CLOSE: | |
e440a328 | 7816 | if (this->check_one_arg()) |
7817 | { | |
7818 | if (this->one_arg()->type()->channel_type() == NULL) | |
7819 | this->report_error(_("argument must be channel")); | |
5202d986 | 7820 | else if (!this->one_arg()->type()->channel_type()->may_send()) |
7821 | this->report_error(_("cannot close receive-only channel")); | |
e440a328 | 7822 | } |
7823 | break; | |
7824 | ||
7825 | case BUILTIN_PANIC: | |
7826 | case BUILTIN_SIZEOF: | |
7827 | case BUILTIN_ALIGNOF: | |
7828 | this->check_one_arg(); | |
7829 | break; | |
7830 | ||
7831 | case BUILTIN_RECOVER: | |
6334270b | 7832 | if (this->args() != NULL |
7833 | && !this->args()->empty() | |
7834 | && !this->recover_arg_is_set_) | |
e440a328 | 7835 | this->report_error(_("too many arguments")); |
7836 | break; | |
7837 | ||
7838 | case BUILTIN_OFFSETOF: | |
7839 | if (this->check_one_arg()) | |
7840 | { | |
7841 | Expression* arg = this->one_arg(); | |
7842 | if (arg->field_reference_expression() == NULL) | |
7843 | this->report_error(_("argument must be a field reference")); | |
7844 | } | |
7845 | break; | |
7846 | ||
7847 | case BUILTIN_COPY: | |
7848 | { | |
7849 | const Expression_list* args = this->args(); | |
7850 | if (args == NULL || args->size() < 2) | |
7851 | { | |
7852 | this->report_error(_("not enough arguments")); | |
7853 | break; | |
7854 | } | |
7855 | else if (args->size() > 2) | |
7856 | { | |
7857 | this->report_error(_("too many arguments")); | |
7858 | break; | |
7859 | } | |
7860 | Type* arg1_type = args->front()->type(); | |
7861 | Type* arg2_type = args->back()->type(); | |
5c13bd80 | 7862 | if (arg1_type->is_error() || arg2_type->is_error()) |
6bebb39d | 7863 | { |
7864 | this->set_is_error(); | |
7865 | break; | |
7866 | } | |
e440a328 | 7867 | |
7868 | Type* e1; | |
411eb89e | 7869 | if (arg1_type->is_slice_type()) |
e440a328 | 7870 | e1 = arg1_type->array_type()->element_type(); |
7871 | else | |
7872 | { | |
7873 | this->report_error(_("left argument must be a slice")); | |
7874 | break; | |
7875 | } | |
7876 | ||
411eb89e | 7877 | if (arg2_type->is_slice_type()) |
60963afd | 7878 | { |
7879 | Type* e2 = arg2_type->array_type()->element_type(); | |
7880 | if (!Type::are_identical(e1, e2, true, NULL)) | |
7881 | this->report_error(_("element types must be the same")); | |
7882 | } | |
e440a328 | 7883 | else if (arg2_type->is_string_type()) |
e440a328 | 7884 | { |
60963afd | 7885 | if (e1->integer_type() == NULL || !e1->integer_type()->is_byte()) |
7886 | this->report_error(_("first argument must be []byte")); | |
e440a328 | 7887 | } |
60963afd | 7888 | else |
7889 | this->report_error(_("second argument must be slice or string")); | |
e440a328 | 7890 | } |
7891 | break; | |
7892 | ||
7893 | case BUILTIN_APPEND: | |
7894 | { | |
7895 | const Expression_list* args = this->args(); | |
b0d311a1 | 7896 | if (args == NULL || args->size() < 2) |
e440a328 | 7897 | { |
7898 | this->report_error(_("not enough arguments")); | |
7899 | break; | |
7900 | } | |
0b7755ec | 7901 | if (args->size() > 2) |
7902 | { | |
7903 | this->report_error(_("too many arguments")); | |
7904 | break; | |
7905 | } | |
cd238b8d | 7906 | if (args->front()->type()->is_error() |
7907 | || args->back()->type()->is_error()) | |
6bebb39d | 7908 | { |
7909 | this->set_is_error(); | |
7910 | break; | |
7911 | } | |
cd238b8d | 7912 | |
7913 | Array_type* at = args->front()->type()->array_type(); | |
7914 | Type* e = at->element_type(); | |
4fd4fcf4 | 7915 | |
7916 | // The language permits appending a string to a []byte, as a | |
7917 | // special case. | |
7918 | if (args->back()->type()->is_string_type()) | |
7919 | { | |
60963afd | 7920 | if (e->integer_type() != NULL && e->integer_type()->is_byte()) |
4fd4fcf4 | 7921 | break; |
7922 | } | |
7923 | ||
19fd40c3 | 7924 | // The language says that the second argument must be |
7925 | // assignable to a slice of the element type of the first | |
7926 | // argument. We already know the first argument is a slice | |
7927 | // type. | |
cd238b8d | 7928 | Type* arg2_type = Type::make_array_type(e, NULL); |
e440a328 | 7929 | std::string reason; |
19fd40c3 | 7930 | if (!Type::are_assignable(arg2_type, args->back()->type(), &reason)) |
e440a328 | 7931 | { |
7932 | if (reason.empty()) | |
19fd40c3 | 7933 | this->report_error(_("argument 2 has invalid type")); |
e440a328 | 7934 | else |
7935 | { | |
19fd40c3 | 7936 | error_at(this->location(), "argument 2 has invalid type (%s)", |
e440a328 | 7937 | reason.c_str()); |
7938 | this->set_is_error(); | |
7939 | } | |
7940 | } | |
7941 | break; | |
7942 | } | |
7943 | ||
7944 | case BUILTIN_REAL: | |
7945 | case BUILTIN_IMAG: | |
7946 | if (this->check_one_arg()) | |
7947 | { | |
7948 | if (this->one_arg()->type()->complex_type() == NULL) | |
7949 | this->report_error(_("argument must have complex type")); | |
7950 | } | |
7951 | break; | |
7952 | ||
48080209 | 7953 | case BUILTIN_COMPLEX: |
e440a328 | 7954 | { |
7955 | const Expression_list* args = this->args(); | |
7956 | if (args == NULL || args->size() < 2) | |
7957 | this->report_error(_("not enough arguments")); | |
7958 | else if (args->size() > 2) | |
7959 | this->report_error(_("too many arguments")); | |
7960 | else if (args->front()->is_error_expression() | |
5c13bd80 | 7961 | || args->front()->type()->is_error() |
e440a328 | 7962 | || args->back()->is_error_expression() |
5c13bd80 | 7963 | || args->back()->type()->is_error()) |
e440a328 | 7964 | this->set_is_error(); |
7965 | else if (!Type::are_identical(args->front()->type(), | |
07ba8be5 | 7966 | args->back()->type(), true, NULL)) |
48080209 | 7967 | this->report_error(_("complex arguments must have identical types")); |
e440a328 | 7968 | else if (args->front()->type()->float_type() == NULL) |
48080209 | 7969 | this->report_error(_("complex arguments must have " |
e440a328 | 7970 | "floating-point type")); |
7971 | } | |
7972 | break; | |
7973 | ||
7974 | default: | |
c3e6f413 | 7975 | go_unreachable(); |
e440a328 | 7976 | } |
7977 | } | |
7978 | ||
72666aed | 7979 | Expression* |
7980 | Builtin_call_expression::do_copy() | |
7981 | { | |
7982 | Call_expression* bce = | |
7983 | new Builtin_call_expression(this->gogo_, this->fn()->copy(), | |
da244e59 | 7984 | (this->args() == NULL |
7985 | ? NULL | |
7986 | : this->args()->copy()), | |
72666aed | 7987 | this->is_varargs(), |
7988 | this->location()); | |
7989 | ||
7990 | if (this->varargs_are_lowered()) | |
7991 | bce->set_varargs_are_lowered(); | |
7992 | return bce; | |
7993 | } | |
7994 | ||
ea664253 | 7995 | // Return the backend representation for a builtin function. |
e440a328 | 7996 | |
ea664253 | 7997 | Bexpression* |
7998 | Builtin_call_expression::do_get_backend(Translate_context* context) | |
e440a328 | 7999 | { |
8000 | Gogo* gogo = context->gogo(); | |
b13c66cd | 8001 | Location location = this->location(); |
e440a328 | 8002 | switch (this->code_) |
8003 | { | |
8004 | case BUILTIN_INVALID: | |
8005 | case BUILTIN_NEW: | |
8006 | case BUILTIN_MAKE: | |
c3e6f413 | 8007 | go_unreachable(); |
e440a328 | 8008 | |
8009 | case BUILTIN_LEN: | |
8010 | case BUILTIN_CAP: | |
8011 | { | |
8012 | const Expression_list* args = this->args(); | |
c484d925 | 8013 | go_assert(args != NULL && args->size() == 1); |
2c809f8f | 8014 | Expression* arg = args->front(); |
e440a328 | 8015 | Type* arg_type = arg->type(); |
0f914071 | 8016 | |
8017 | if (this->seen_) | |
8018 | { | |
c484d925 | 8019 | go_assert(saw_errors()); |
ea664253 | 8020 | return context->backend()->error_expression(); |
0f914071 | 8021 | } |
8022 | this->seen_ = true; | |
0f914071 | 8023 | this->seen_ = false; |
e440a328 | 8024 | if (arg_type->points_to() != NULL) |
8025 | { | |
8026 | arg_type = arg_type->points_to(); | |
c484d925 | 8027 | go_assert(arg_type->array_type() != NULL |
411eb89e | 8028 | && !arg_type->is_slice_type()); |
2c809f8f | 8029 | arg = Expression::make_unary(OPERATOR_MULT, arg, location); |
e440a328 | 8030 | } |
8031 | ||
1b1f2abf | 8032 | Type* int_type = Type::lookup_integer_type("int"); |
2c809f8f | 8033 | Expression* val; |
e440a328 | 8034 | if (this->code_ == BUILTIN_LEN) |
8035 | { | |
8036 | if (arg_type->is_string_type()) | |
2c809f8f | 8037 | val = Expression::make_string_info(arg, STRING_INFO_LENGTH, |
8038 | location); | |
e440a328 | 8039 | else if (arg_type->array_type() != NULL) |
0f914071 | 8040 | { |
8041 | if (this->seen_) | |
8042 | { | |
c484d925 | 8043 | go_assert(saw_errors()); |
ea664253 | 8044 | return context->backend()->error_expression(); |
0f914071 | 8045 | } |
8046 | this->seen_ = true; | |
2c809f8f | 8047 | val = arg_type->array_type()->get_length(gogo, arg); |
0f914071 | 8048 | this->seen_ = false; |
8049 | } | |
e440a328 | 8050 | else if (arg_type->map_type() != NULL) |
2c809f8f | 8051 | val = Runtime::make_call(Runtime::MAP_LEN, location, 1, arg); |
e440a328 | 8052 | else if (arg_type->channel_type() != NULL) |
2c809f8f | 8053 | val = Runtime::make_call(Runtime::CHAN_LEN, location, 1, arg); |
e440a328 | 8054 | else |
c3e6f413 | 8055 | go_unreachable(); |
e440a328 | 8056 | } |
8057 | else | |
8058 | { | |
8059 | if (arg_type->array_type() != NULL) | |
0f914071 | 8060 | { |
8061 | if (this->seen_) | |
8062 | { | |
c484d925 | 8063 | go_assert(saw_errors()); |
ea664253 | 8064 | return context->backend()->error_expression(); |
0f914071 | 8065 | } |
8066 | this->seen_ = true; | |
2c809f8f | 8067 | val = arg_type->array_type()->get_capacity(gogo, arg); |
0f914071 | 8068 | this->seen_ = false; |
8069 | } | |
e440a328 | 8070 | else if (arg_type->channel_type() != NULL) |
2c809f8f | 8071 | val = Runtime::make_call(Runtime::CHAN_CAP, location, 1, arg); |
e440a328 | 8072 | else |
c3e6f413 | 8073 | go_unreachable(); |
e440a328 | 8074 | } |
8075 | ||
2c809f8f | 8076 | return Expression::make_cast(int_type, val, |
ea664253 | 8077 | location)->get_backend(context); |
e440a328 | 8078 | } |
8079 | ||
8080 | case BUILTIN_PRINT: | |
8081 | case BUILTIN_PRINTLN: | |
8082 | { | |
8083 | const bool is_ln = this->code_ == BUILTIN_PRINTLN; | |
2c809f8f | 8084 | Expression* print_stmts = NULL; |
e440a328 | 8085 | |
8086 | const Expression_list* call_args = this->args(); | |
8087 | if (call_args != NULL) | |
8088 | { | |
8089 | for (Expression_list::const_iterator p = call_args->begin(); | |
8090 | p != call_args->end(); | |
8091 | ++p) | |
8092 | { | |
8093 | if (is_ln && p != call_args->begin()) | |
8094 | { | |
2c809f8f | 8095 | Expression* print_space = |
8096 | Runtime::make_call(Runtime::PRINT_SPACE, | |
8097 | this->location(), 0); | |
e440a328 | 8098 | |
2c809f8f | 8099 | print_stmts = |
8100 | Expression::make_compound(print_stmts, print_space, | |
8101 | location); | |
8102 | } | |
e440a328 | 8103 | |
2c809f8f | 8104 | Expression* arg = *p; |
8105 | Type* type = arg->type(); | |
8106 | Runtime::Function code; | |
e440a328 | 8107 | if (type->is_string_type()) |
2c809f8f | 8108 | code = Runtime::PRINT_STRING; |
e440a328 | 8109 | else if (type->integer_type() != NULL |
8110 | && type->integer_type()->is_unsigned()) | |
8111 | { | |
e440a328 | 8112 | Type* itype = Type::lookup_integer_type("uint64"); |
2c809f8f | 8113 | arg = Expression::make_cast(itype, arg, location); |
8114 | code = Runtime::PRINT_UINT64; | |
e440a328 | 8115 | } |
8116 | else if (type->integer_type() != NULL) | |
8117 | { | |
e440a328 | 8118 | Type* itype = Type::lookup_integer_type("int64"); |
2c809f8f | 8119 | arg = Expression::make_cast(itype, arg, location); |
8120 | code = Runtime::PRINT_INT64; | |
e440a328 | 8121 | } |
8122 | else if (type->float_type() != NULL) | |
8123 | { | |
2c809f8f | 8124 | Type* dtype = Type::lookup_float_type("float64"); |
8125 | arg = Expression::make_cast(dtype, arg, location); | |
8126 | code = Runtime::PRINT_DOUBLE; | |
e440a328 | 8127 | } |
8128 | else if (type->complex_type() != NULL) | |
8129 | { | |
2c809f8f | 8130 | Type* ctype = Type::lookup_complex_type("complex128"); |
8131 | arg = Expression::make_cast(ctype, arg, location); | |
8132 | code = Runtime::PRINT_COMPLEX; | |
e440a328 | 8133 | } |
8134 | else if (type->is_boolean_type()) | |
2c809f8f | 8135 | code = Runtime::PRINT_BOOL; |
e440a328 | 8136 | else if (type->points_to() != NULL |
8137 | || type->channel_type() != NULL | |
8138 | || type->map_type() != NULL | |
8139 | || type->function_type() != NULL) | |
8140 | { | |
2c809f8f | 8141 | arg = Expression::make_cast(type, arg, location); |
8142 | code = Runtime::PRINT_POINTER; | |
e440a328 | 8143 | } |
8144 | else if (type->interface_type() != NULL) | |
8145 | { | |
8146 | if (type->interface_type()->is_empty()) | |
2c809f8f | 8147 | code = Runtime::PRINT_EMPTY_INTERFACE; |
e440a328 | 8148 | else |
2c809f8f | 8149 | code = Runtime::PRINT_INTERFACE; |
e440a328 | 8150 | } |
411eb89e | 8151 | else if (type->is_slice_type()) |
2c809f8f | 8152 | code = Runtime::PRINT_SLICE; |
e440a328 | 8153 | else |
cd238b8d | 8154 | { |
8155 | go_assert(saw_errors()); | |
ea664253 | 8156 | return context->backend()->error_expression(); |
cd238b8d | 8157 | } |
e440a328 | 8158 | |
2c809f8f | 8159 | Expression* call = Runtime::make_call(code, location, 1, arg); |
8160 | if (print_stmts == NULL) | |
8161 | print_stmts = call; | |
8162 | else | |
8163 | print_stmts = Expression::make_compound(print_stmts, call, | |
8164 | location); | |
e440a328 | 8165 | } |
8166 | } | |
8167 | ||
8168 | if (is_ln) | |
8169 | { | |
2c809f8f | 8170 | Expression* print_nl = |
8171 | Runtime::make_call(Runtime::PRINT_NL, location, 0); | |
8172 | if (print_stmts == NULL) | |
8173 | print_stmts = print_nl; | |
8174 | else | |
8175 | print_stmts = Expression::make_compound(print_stmts, print_nl, | |
8176 | location); | |
e440a328 | 8177 | } |
8178 | ||
32e3ff69 | 8179 | // There aren't any arguments to the print builtin. The compiler |
8180 | // issues a warning for this so we should avoid getting the backend | |
8181 | // representation for this call. Instead, perform a no-op. | |
8182 | if (print_stmts == NULL) | |
8183 | return context->backend()->boolean_constant_expression(false); | |
8184 | ||
ea664253 | 8185 | return print_stmts->get_backend(context); |
e440a328 | 8186 | } |
8187 | ||
8188 | case BUILTIN_PANIC: | |
8189 | { | |
8190 | const Expression_list* args = this->args(); | |
c484d925 | 8191 | go_assert(args != NULL && args->size() == 1); |
e440a328 | 8192 | Expression* arg = args->front(); |
b13c66cd | 8193 | Type *empty = |
823c7e3d | 8194 | Type::make_empty_interface_type(Linemap::predeclared_location()); |
2c809f8f | 8195 | arg = Expression::convert_for_assignment(gogo, empty, arg, location); |
8196 | ||
8197 | Expression* panic = | |
8198 | Runtime::make_call(Runtime::PANIC, location, 1, arg); | |
ea664253 | 8199 | return panic->get_backend(context); |
e440a328 | 8200 | } |
8201 | ||
8202 | case BUILTIN_RECOVER: | |
8203 | { | |
8204 | // The argument is set when building recover thunks. It's a | |
8205 | // boolean value which is true if we can recover a value now. | |
8206 | const Expression_list* args = this->args(); | |
c484d925 | 8207 | go_assert(args != NULL && args->size() == 1); |
e440a328 | 8208 | Expression* arg = args->front(); |
b13c66cd | 8209 | Type *empty = |
823c7e3d | 8210 | Type::make_empty_interface_type(Linemap::predeclared_location()); |
e440a328 | 8211 | |
e440a328 | 8212 | Expression* nil = Expression::make_nil(location); |
2c809f8f | 8213 | nil = Expression::convert_for_assignment(gogo, empty, nil, location); |
e440a328 | 8214 | |
8215 | // We need to handle a deferred call to recover specially, | |
8216 | // because it changes whether it can recover a panic or not. | |
8217 | // See test7 in test/recover1.go. | |
2c809f8f | 8218 | Expression* recover = Runtime::make_call((this->is_deferred() |
8219 | ? Runtime::DEFERRED_RECOVER | |
8220 | : Runtime::RECOVER), | |
8221 | location, 0); | |
8222 | Expression* cond = | |
8223 | Expression::make_conditional(arg, recover, nil, location); | |
ea664253 | 8224 | return cond->get_backend(context); |
e440a328 | 8225 | } |
8226 | ||
8227 | case BUILTIN_CLOSE: | |
e440a328 | 8228 | { |
8229 | const Expression_list* args = this->args(); | |
c484d925 | 8230 | go_assert(args != NULL && args->size() == 1); |
e440a328 | 8231 | Expression* arg = args->front(); |
2c809f8f | 8232 | Expression* close = Runtime::make_call(Runtime::CLOSE, location, |
8233 | 1, arg); | |
ea664253 | 8234 | return close->get_backend(context); |
e440a328 | 8235 | } |
8236 | ||
8237 | case BUILTIN_SIZEOF: | |
8238 | case BUILTIN_OFFSETOF: | |
8239 | case BUILTIN_ALIGNOF: | |
8240 | { | |
0c77715b | 8241 | Numeric_constant nc; |
8242 | unsigned long val; | |
8243 | if (!this->numeric_constant_value(&nc) | |
8244 | || nc.to_unsigned_long(&val) != Numeric_constant::NC_UL_VALID) | |
7f1d9abd | 8245 | { |
c484d925 | 8246 | go_assert(saw_errors()); |
ea664253 | 8247 | return context->backend()->error_expression(); |
7f1d9abd | 8248 | } |
7ba86326 | 8249 | Type* uintptr_type = Type::lookup_integer_type("uintptr"); |
2c809f8f | 8250 | mpz_t ival; |
8251 | nc.get_int(&ival); | |
8252 | Expression* int_cst = | |
e67508fa | 8253 | Expression::make_integer_z(&ival, uintptr_type, location); |
2c809f8f | 8254 | mpz_clear(ival); |
ea664253 | 8255 | return int_cst->get_backend(context); |
e440a328 | 8256 | } |
8257 | ||
8258 | case BUILTIN_COPY: | |
8259 | { | |
8260 | const Expression_list* args = this->args(); | |
c484d925 | 8261 | go_assert(args != NULL && args->size() == 2); |
e440a328 | 8262 | Expression* arg1 = args->front(); |
8263 | Expression* arg2 = args->back(); | |
8264 | ||
e440a328 | 8265 | Type* arg1_type = arg1->type(); |
8266 | Array_type* at = arg1_type->array_type(); | |
35a54f17 | 8267 | go_assert(arg1->is_variable()); |
2c809f8f | 8268 | Expression* arg1_val = at->get_value_pointer(gogo, arg1); |
8269 | Expression* arg1_len = at->get_length(gogo, arg1); | |
e440a328 | 8270 | |
8271 | Type* arg2_type = arg2->type(); | |
2c809f8f | 8272 | go_assert(arg2->is_variable()); |
8273 | Expression* arg2_val; | |
8274 | Expression* arg2_len; | |
411eb89e | 8275 | if (arg2_type->is_slice_type()) |
e440a328 | 8276 | { |
8277 | at = arg2_type->array_type(); | |
2c809f8f | 8278 | arg2_val = at->get_value_pointer(gogo, arg2); |
8279 | arg2_len = at->get_length(gogo, arg2); | |
e440a328 | 8280 | } |
8281 | else | |
8282 | { | |
2c809f8f | 8283 | go_assert(arg2->is_variable()); |
8284 | arg2_val = Expression::make_string_info(arg2, STRING_INFO_DATA, | |
8285 | location); | |
8286 | arg2_len = Expression::make_string_info(arg2, STRING_INFO_LENGTH, | |
8287 | location); | |
e440a328 | 8288 | } |
2c809f8f | 8289 | Expression* cond = |
8290 | Expression::make_binary(OPERATOR_LT, arg1_len, arg2_len, location); | |
8291 | Expression* length = | |
8292 | Expression::make_conditional(cond, arg1_len, arg2_len, location); | |
e440a328 | 8293 | |
8294 | Type* element_type = at->element_type(); | |
9f0e0513 | 8295 | Btype* element_btype = element_type->get_backend(gogo); |
3f378015 | 8296 | int64_t element_size = gogo->backend()->type_size(element_btype); |
8297 | Expression* size_expr = Expression::make_integer_int64(element_size, | |
8298 | length->type(), | |
8299 | location); | |
2c809f8f | 8300 | Expression* bytecount = |
8301 | Expression::make_binary(OPERATOR_MULT, size_expr, length, location); | |
8302 | Expression* copy = Runtime::make_call(Runtime::COPY, location, 3, | |
8303 | arg1_val, arg2_val, bytecount); | |
8304 | ||
8305 | Expression* compound = Expression::make_compound(copy, length, location); | |
ea664253 | 8306 | return compound->get_backend(context); |
e440a328 | 8307 | } |
8308 | ||
8309 | case BUILTIN_APPEND: | |
8310 | { | |
8311 | const Expression_list* args = this->args(); | |
c484d925 | 8312 | go_assert(args != NULL && args->size() == 2); |
e440a328 | 8313 | Expression* arg1 = args->front(); |
8314 | Expression* arg2 = args->back(); | |
8315 | ||
9d44fbe3 | 8316 | Array_type* at = arg1->type()->array_type(); |
4fd4fcf4 | 8317 | Type* element_type = at->element_type()->forwarded(); |
9d44fbe3 | 8318 | |
2c809f8f | 8319 | go_assert(arg2->is_variable()); |
8320 | Expression* arg2_val; | |
8321 | Expression* arg2_len; | |
3f378015 | 8322 | int64_t size; |
4fd4fcf4 | 8323 | if (arg2->type()->is_string_type() |
60963afd | 8324 | && element_type->integer_type() != NULL |
8325 | && element_type->integer_type()->is_byte()) | |
4fd4fcf4 | 8326 | { |
2c809f8f | 8327 | arg2_val = Expression::make_string_info(arg2, STRING_INFO_DATA, |
8328 | location); | |
8329 | arg2_len = Expression::make_string_info(arg2, STRING_INFO_LENGTH, | |
8330 | location); | |
e67508fa | 8331 | size = 1; |
4fd4fcf4 | 8332 | } |
8333 | else | |
8334 | { | |
2c809f8f | 8335 | arg2_val = at->get_value_pointer(gogo, arg2); |
8336 | arg2_len = at->get_length(gogo, arg2); | |
35a54f17 | 8337 | Btype* element_btype = element_type->get_backend(gogo); |
e67508fa | 8338 | size = gogo->backend()->type_size(element_btype); |
4fd4fcf4 | 8339 | } |
2c809f8f | 8340 | Expression* element_size = |
3f378015 | 8341 | Expression::make_integer_int64(size, NULL, location); |
2c809f8f | 8342 | |
8343 | Expression* append = Runtime::make_call(Runtime::APPEND, location, 4, | |
8344 | arg1, arg2_val, arg2_len, | |
8345 | element_size); | |
8346 | append = Expression::make_unsafe_cast(arg1->type(), append, location); | |
ea664253 | 8347 | return append->get_backend(context); |
e440a328 | 8348 | } |
8349 | ||
8350 | case BUILTIN_REAL: | |
8351 | case BUILTIN_IMAG: | |
8352 | { | |
8353 | const Expression_list* args = this->args(); | |
c484d925 | 8354 | go_assert(args != NULL && args->size() == 1); |
2c809f8f | 8355 | |
8356 | Bexpression* ret; | |
ea664253 | 8357 | Bexpression* bcomplex = args->front()->get_backend(context); |
2c809f8f | 8358 | if (this->code_ == BUILTIN_REAL) |
8359 | ret = gogo->backend()->real_part_expression(bcomplex, location); | |
8360 | else | |
8361 | ret = gogo->backend()->imag_part_expression(bcomplex, location); | |
ea664253 | 8362 | return ret; |
e440a328 | 8363 | } |
8364 | ||
48080209 | 8365 | case BUILTIN_COMPLEX: |
e440a328 | 8366 | { |
8367 | const Expression_list* args = this->args(); | |
c484d925 | 8368 | go_assert(args != NULL && args->size() == 2); |
ea664253 | 8369 | Bexpression* breal = args->front()->get_backend(context); |
8370 | Bexpression* bimag = args->back()->get_backend(context); | |
8371 | return gogo->backend()->complex_expression(breal, bimag, location); | |
e440a328 | 8372 | } |
8373 | ||
8374 | default: | |
c3e6f413 | 8375 | go_unreachable(); |
e440a328 | 8376 | } |
8377 | } | |
8378 | ||
8379 | // We have to support exporting a builtin call expression, because | |
8380 | // code can set a constant to the result of a builtin expression. | |
8381 | ||
8382 | void | |
8383 | Builtin_call_expression::do_export(Export* exp) const | |
8384 | { | |
0c77715b | 8385 | Numeric_constant nc; |
8386 | if (!this->numeric_constant_value(&nc)) | |
8387 | { | |
8388 | error_at(this->location(), "value is not constant"); | |
8389 | return; | |
8390 | } | |
e440a328 | 8391 | |
0c77715b | 8392 | if (nc.is_int()) |
e440a328 | 8393 | { |
0c77715b | 8394 | mpz_t val; |
8395 | nc.get_int(&val); | |
e440a328 | 8396 | Integer_expression::export_integer(exp, val); |
0c77715b | 8397 | mpz_clear(val); |
e440a328 | 8398 | } |
0c77715b | 8399 | else if (nc.is_float()) |
e440a328 | 8400 | { |
8401 | mpfr_t fval; | |
0c77715b | 8402 | nc.get_float(&fval); |
8403 | Float_expression::export_float(exp, fval); | |
e440a328 | 8404 | mpfr_clear(fval); |
8405 | } | |
0c77715b | 8406 | else if (nc.is_complex()) |
e440a328 | 8407 | { |
fcbea5e4 | 8408 | mpc_t cval; |
8409 | nc.get_complex(&cval); | |
8410 | Complex_expression::export_complex(exp, cval); | |
8411 | mpc_clear(cval); | |
e440a328 | 8412 | } |
0c77715b | 8413 | else |
8414 | go_unreachable(); | |
e440a328 | 8415 | |
8416 | // A trailing space lets us reliably identify the end of the number. | |
8417 | exp->write_c_string(" "); | |
8418 | } | |
8419 | ||
8420 | // Class Call_expression. | |
8421 | ||
8381eda7 | 8422 | // A Go function can be viewed in a couple of different ways. The |
8423 | // code of a Go function becomes a backend function with parameters | |
8424 | // whose types are simply the backend representation of the Go types. | |
8425 | // If there are multiple results, they are returned as a backend | |
8426 | // struct. | |
8427 | ||
8428 | // However, when Go code refers to a function other than simply | |
8429 | // calling it, the backend type of that function is actually a struct. | |
8430 | // The first field of the struct points to the Go function code | |
8431 | // (sometimes a wrapper as described below). The remaining fields | |
8432 | // hold addresses of closed-over variables. This struct is called a | |
8433 | // closure. | |
8434 | ||
8435 | // There are a few cases to consider. | |
8436 | ||
8437 | // A direct function call of a known function in package scope. In | |
8438 | // this case there are no closed-over variables, and we know the name | |
8439 | // of the function code. We can simply produce a backend call to the | |
8440 | // function directly, and not worry about the closure. | |
8441 | ||
8442 | // A direct function call of a known function literal. In this case | |
8443 | // we know the function code and we know the closure. We generate the | |
8444 | // function code such that it expects an additional final argument of | |
8445 | // the closure type. We pass the closure as the last argument, after | |
8446 | // the other arguments. | |
8447 | ||
8448 | // An indirect function call. In this case we have a closure. We | |
8449 | // load the pointer to the function code from the first field of the | |
8450 | // closure. We pass the address of the closure as the last argument. | |
8451 | ||
8452 | // A call to a method of an interface. Type methods are always at | |
8453 | // package scope, so we call the function directly, and don't worry | |
8454 | // about the closure. | |
8455 | ||
8456 | // This means that for a function at package scope we have two cases. | |
8457 | // One is the direct call, which has no closure. The other is the | |
8458 | // indirect call, which does have a closure. We can't simply ignore | |
8459 | // the closure, even though it is the last argument, because that will | |
8460 | // fail on targets where the function pops its arguments. So when | |
8461 | // generating a closure for a package-scope function we set the | |
8462 | // function code pointer in the closure to point to a wrapper | |
8463 | // function. This wrapper function accepts a final argument that | |
8464 | // points to the closure, ignores it, and calls the real function as a | |
8465 | // direct function call. This wrapper will normally be efficient, and | |
8466 | // can often simply be a tail call to the real function. | |
8467 | ||
8468 | // We don't use GCC's static chain pointer because 1) we don't need | |
8469 | // it; 2) GCC only permits using a static chain to call a known | |
8470 | // function, so we can't use it for an indirect call anyhow. Since we | |
8471 | // can't use it for an indirect call, we may as well not worry about | |
8472 | // using it for a direct call either. | |
8473 | ||
8474 | // We pass the closure last rather than first because it means that | |
8475 | // the function wrapper we put into a closure for a package-scope | |
8476 | // function can normally just be a tail call to the real function. | |
8477 | ||
8478 | // For method expressions we generate a wrapper that loads the | |
8479 | // receiver from the closure and then calls the method. This | |
8480 | // unfortunately forces reshuffling the arguments, since there is a | |
8481 | // new first argument, but we can't avoid reshuffling either for | |
8482 | // method expressions or for indirect calls of package-scope | |
8483 | // functions, and since the latter are more common we reshuffle for | |
8484 | // method expressions. | |
8485 | ||
8486 | // Note that the Go code retains the Go types. The extra final | |
8487 | // argument only appears when we convert to the backend | |
8488 | // representation. | |
8489 | ||
e440a328 | 8490 | // Traversal. |
8491 | ||
8492 | int | |
8493 | Call_expression::do_traverse(Traverse* traverse) | |
8494 | { | |
8495 | if (Expression::traverse(&this->fn_, traverse) == TRAVERSE_EXIT) | |
8496 | return TRAVERSE_EXIT; | |
8497 | if (this->args_ != NULL) | |
8498 | { | |
8499 | if (this->args_->traverse(traverse) == TRAVERSE_EXIT) | |
8500 | return TRAVERSE_EXIT; | |
8501 | } | |
8502 | return TRAVERSE_CONTINUE; | |
8503 | } | |
8504 | ||
8505 | // Lower a call statement. | |
8506 | ||
8507 | Expression* | |
ceeb4318 | 8508 | Call_expression::do_lower(Gogo* gogo, Named_object* function, |
8509 | Statement_inserter* inserter, int) | |
e440a328 | 8510 | { |
b13c66cd | 8511 | Location loc = this->location(); |
09ea332d | 8512 | |
ceeb4318 | 8513 | // A type cast can look like a function call. |
e440a328 | 8514 | if (this->fn_->is_type_expression() |
8515 | && this->args_ != NULL | |
8516 | && this->args_->size() == 1) | |
8517 | return Expression::make_cast(this->fn_->type(), this->args_->front(), | |
09ea332d | 8518 | loc); |
e440a328 | 8519 | |
88f06749 | 8520 | // Because do_type will return an error type and thus prevent future |
8521 | // errors, check for that case now to ensure that the error gets | |
8522 | // reported. | |
37448b10 | 8523 | Function_type* fntype = this->get_function_type(); |
8524 | if (fntype == NULL) | |
88f06749 | 8525 | { |
8526 | if (!this->fn_->type()->is_error()) | |
8527 | this->report_error(_("expected function")); | |
5f1045b5 | 8528 | this->set_is_error(); |
8529 | return this; | |
88f06749 | 8530 | } |
8531 | ||
e440a328 | 8532 | // Handle an argument which is a call to a function which returns |
8533 | // multiple results. | |
8534 | if (this->args_ != NULL | |
8535 | && this->args_->size() == 1 | |
37448b10 | 8536 | && this->args_->front()->call_expression() != NULL) |
e440a328 | 8537 | { |
e440a328 | 8538 | size_t rc = this->args_->front()->call_expression()->result_count(); |
8539 | if (rc > 1 | |
37448b10 | 8540 | && ((fntype->parameters() != NULL |
8541 | && (fntype->parameters()->size() == rc | |
8542 | || (fntype->is_varargs() | |
8543 | && fntype->parameters()->size() - 1 <= rc))) | |
8544 | || fntype->is_builtin())) | |
e440a328 | 8545 | { |
8546 | Call_expression* call = this->args_->front()->call_expression(); | |
e90ecd2d | 8547 | call->set_is_multi_value_arg(); |
c33af8e4 | 8548 | if (this->is_varargs_) |
8549 | { | |
8550 | // It is not clear which result of a multiple result call | |
8551 | // the ellipsis operator should be applied to. If we unpack the | |
8552 | // the call into its individual results here, the ellipsis will be | |
8553 | // applied to the last result. | |
8554 | error_at(call->location(), | |
8555 | _("multiple-value argument in single-value context")); | |
8556 | return Expression::make_error(call->location()); | |
8557 | } | |
8558 | ||
e440a328 | 8559 | Expression_list* args = new Expression_list; |
8560 | for (size_t i = 0; i < rc; ++i) | |
8561 | args->push_back(Expression::make_call_result(call, i)); | |
8562 | // We can't return a new call expression here, because this | |
42535814 | 8563 | // one may be referenced by Call_result expressions. We |
8564 | // also can't delete the old arguments, because we may still | |
8565 | // traverse them somewhere up the call stack. FIXME. | |
e440a328 | 8566 | this->args_ = args; |
8567 | } | |
8568 | } | |
8569 | ||
37448b10 | 8570 | // Recognize a call to a builtin function. |
8571 | if (fntype->is_builtin()) | |
8572 | return new Builtin_call_expression(gogo, this->fn_, this->args_, | |
8573 | this->is_varargs_, loc); | |
8574 | ||
ceeb4318 | 8575 | // If this call returns multiple results, create a temporary |
8576 | // variable for each result. | |
8577 | size_t rc = this->result_count(); | |
8578 | if (rc > 1 && this->results_ == NULL) | |
8579 | { | |
8580 | std::vector<Temporary_statement*>* temps = | |
8581 | new std::vector<Temporary_statement*>; | |
8582 | temps->reserve(rc); | |
37448b10 | 8583 | const Typed_identifier_list* results = fntype->results(); |
ceeb4318 | 8584 | for (Typed_identifier_list::const_iterator p = results->begin(); |
8585 | p != results->end(); | |
8586 | ++p) | |
8587 | { | |
8588 | Temporary_statement* temp = Statement::make_temporary(p->type(), | |
09ea332d | 8589 | NULL, loc); |
ceeb4318 | 8590 | inserter->insert(temp); |
8591 | temps->push_back(temp); | |
8592 | } | |
8593 | this->results_ = temps; | |
8594 | } | |
8595 | ||
e440a328 | 8596 | // Handle a call to a varargs function by packaging up the extra |
8597 | // parameters. | |
37448b10 | 8598 | if (fntype->is_varargs()) |
e440a328 | 8599 | { |
e440a328 | 8600 | const Typed_identifier_list* parameters = fntype->parameters(); |
c484d925 | 8601 | go_assert(parameters != NULL && !parameters->empty()); |
e440a328 | 8602 | Type* varargs_type = parameters->back().type(); |
09ea332d | 8603 | this->lower_varargs(gogo, function, inserter, varargs_type, |
8604 | parameters->size()); | |
8605 | } | |
8606 | ||
8607 | // If this is call to a method, call the method directly passing the | |
8608 | // object as the first parameter. | |
8609 | Bound_method_expression* bme = this->fn_->bound_method_expression(); | |
8610 | if (bme != NULL) | |
8611 | { | |
0afbb937 | 8612 | Named_object* methodfn = bme->function(); |
09ea332d | 8613 | Expression* first_arg = bme->first_argument(); |
8614 | ||
8615 | // We always pass a pointer when calling a method. | |
8616 | if (first_arg->type()->points_to() == NULL | |
8617 | && !first_arg->type()->is_error()) | |
8618 | { | |
8619 | first_arg = Expression::make_unary(OPERATOR_AND, first_arg, loc); | |
8620 | // We may need to create a temporary variable so that we can | |
8621 | // take the address. We can't do that here because it will | |
8622 | // mess up the order of evaluation. | |
8623 | Unary_expression* ue = static_cast<Unary_expression*>(first_arg); | |
8624 | ue->set_create_temp(); | |
8625 | } | |
8626 | ||
8627 | // If we are calling a method which was inherited from an | |
8628 | // embedded struct, and the method did not get a stub, then the | |
8629 | // first type may be wrong. | |
8630 | Type* fatype = bme->first_argument_type(); | |
8631 | if (fatype != NULL) | |
8632 | { | |
8633 | if (fatype->points_to() == NULL) | |
8634 | fatype = Type::make_pointer_type(fatype); | |
8635 | first_arg = Expression::make_unsafe_cast(fatype, first_arg, loc); | |
8636 | } | |
8637 | ||
8638 | Expression_list* new_args = new Expression_list(); | |
8639 | new_args->push_back(first_arg); | |
8640 | if (this->args_ != NULL) | |
8641 | { | |
8642 | for (Expression_list::const_iterator p = this->args_->begin(); | |
8643 | p != this->args_->end(); | |
8644 | ++p) | |
8645 | new_args->push_back(*p); | |
8646 | } | |
8647 | ||
8648 | // We have to change in place because this structure may be | |
8649 | // referenced by Call_result_expressions. We can't delete the | |
8650 | // old arguments, because we may be traversing them up in some | |
8651 | // caller. FIXME. | |
8652 | this->args_ = new_args; | |
0afbb937 | 8653 | this->fn_ = Expression::make_func_reference(methodfn, NULL, |
09ea332d | 8654 | bme->location()); |
e440a328 | 8655 | } |
8656 | ||
8657 | return this; | |
8658 | } | |
8659 | ||
8660 | // Lower a call to a varargs function. FUNCTION is the function in | |
8661 | // which the call occurs--it's not the function we are calling. | |
8662 | // VARARGS_TYPE is the type of the varargs parameter, a slice type. | |
8663 | // PARAM_COUNT is the number of parameters of the function we are | |
8664 | // calling; the last of these parameters will be the varargs | |
8665 | // parameter. | |
8666 | ||
09ea332d | 8667 | void |
e440a328 | 8668 | Call_expression::lower_varargs(Gogo* gogo, Named_object* function, |
ceeb4318 | 8669 | Statement_inserter* inserter, |
e440a328 | 8670 | Type* varargs_type, size_t param_count) |
8671 | { | |
8672 | if (this->varargs_are_lowered_) | |
09ea332d | 8673 | return; |
e440a328 | 8674 | |
b13c66cd | 8675 | Location loc = this->location(); |
e440a328 | 8676 | |
c484d925 | 8677 | go_assert(param_count > 0); |
411eb89e | 8678 | go_assert(varargs_type->is_slice_type()); |
e440a328 | 8679 | |
8680 | size_t arg_count = this->args_ == NULL ? 0 : this->args_->size(); | |
8681 | if (arg_count < param_count - 1) | |
8682 | { | |
8683 | // Not enough arguments; will be caught in check_types. | |
09ea332d | 8684 | return; |
e440a328 | 8685 | } |
8686 | ||
8687 | Expression_list* old_args = this->args_; | |
8688 | Expression_list* new_args = new Expression_list(); | |
8689 | bool push_empty_arg = false; | |
8690 | if (old_args == NULL || old_args->empty()) | |
8691 | { | |
c484d925 | 8692 | go_assert(param_count == 1); |
e440a328 | 8693 | push_empty_arg = true; |
8694 | } | |
8695 | else | |
8696 | { | |
8697 | Expression_list::const_iterator pa; | |
8698 | int i = 1; | |
8699 | for (pa = old_args->begin(); pa != old_args->end(); ++pa, ++i) | |
8700 | { | |
8701 | if (static_cast<size_t>(i) == param_count) | |
8702 | break; | |
8703 | new_args->push_back(*pa); | |
8704 | } | |
8705 | ||
8706 | // We have reached the varargs parameter. | |
8707 | ||
8708 | bool issued_error = false; | |
8709 | if (pa == old_args->end()) | |
8710 | push_empty_arg = true; | |
8711 | else if (pa + 1 == old_args->end() && this->is_varargs_) | |
8712 | new_args->push_back(*pa); | |
8713 | else if (this->is_varargs_) | |
8714 | { | |
a6645f74 | 8715 | if ((*pa)->type()->is_slice_type()) |
8716 | this->report_error(_("too many arguments")); | |
8717 | else | |
8718 | { | |
8719 | error_at(this->location(), | |
8720 | _("invalid use of %<...%> with non-slice")); | |
8721 | this->set_is_error(); | |
8722 | } | |
09ea332d | 8723 | return; |
e440a328 | 8724 | } |
e440a328 | 8725 | else |
8726 | { | |
8727 | Type* element_type = varargs_type->array_type()->element_type(); | |
8728 | Expression_list* vals = new Expression_list; | |
8729 | for (; pa != old_args->end(); ++pa, ++i) | |
8730 | { | |
8731 | // Check types here so that we get a better message. | |
8732 | Type* patype = (*pa)->type(); | |
b13c66cd | 8733 | Location paloc = (*pa)->location(); |
e440a328 | 8734 | if (!this->check_argument_type(i, element_type, patype, |
8735 | paloc, issued_error)) | |
8736 | continue; | |
8737 | vals->push_back(*pa); | |
8738 | } | |
8739 | Expression* val = | |
8740 | Expression::make_slice_composite_literal(varargs_type, vals, loc); | |
09ea332d | 8741 | gogo->lower_expression(function, inserter, &val); |
e440a328 | 8742 | new_args->push_back(val); |
8743 | } | |
8744 | } | |
8745 | ||
8746 | if (push_empty_arg) | |
8747 | new_args->push_back(Expression::make_nil(loc)); | |
8748 | ||
8749 | // We can't return a new call expression here, because this one may | |
6d4c2432 | 8750 | // be referenced by Call_result expressions. FIXME. We can't |
8751 | // delete OLD_ARGS because we may have both a Call_expression and a | |
8752 | // Builtin_call_expression which refer to them. FIXME. | |
e440a328 | 8753 | this->args_ = new_args; |
8754 | this->varargs_are_lowered_ = true; | |
e440a328 | 8755 | } |
8756 | ||
2c809f8f | 8757 | // Flatten a call with multiple results into a temporary. |
8758 | ||
8759 | Expression* | |
b8e86a51 | 8760 | Call_expression::do_flatten(Gogo* gogo, Named_object*, |
8761 | Statement_inserter* inserter) | |
2c809f8f | 8762 | { |
5bf8be8b | 8763 | if (this->is_erroneous_call()) |
8764 | { | |
8765 | go_assert(saw_errors()); | |
8766 | return Expression::make_error(this->location()); | |
8767 | } | |
b8e86a51 | 8768 | |
91c0fd76 | 8769 | if (this->is_flattened_) |
8770 | return this; | |
8771 | this->is_flattened_ = true; | |
8772 | ||
b8e86a51 | 8773 | // Add temporary variables for all arguments that require type |
8774 | // conversion. | |
8775 | Function_type* fntype = this->get_function_type(); | |
9782d556 | 8776 | if (fntype == NULL) |
8777 | { | |
8778 | go_assert(saw_errors()); | |
8779 | return this; | |
8780 | } | |
b8e86a51 | 8781 | if (this->args_ != NULL && !this->args_->empty() |
8782 | && fntype->parameters() != NULL && !fntype->parameters()->empty()) | |
8783 | { | |
8784 | bool is_interface_method = | |
8785 | this->fn_->interface_field_reference_expression() != NULL; | |
8786 | ||
8787 | Expression_list *args = new Expression_list(); | |
8788 | Typed_identifier_list::const_iterator pp = fntype->parameters()->begin(); | |
8789 | Expression_list::const_iterator pa = this->args_->begin(); | |
8790 | if (!is_interface_method && fntype->is_method()) | |
8791 | { | |
8792 | // The receiver argument. | |
8793 | args->push_back(*pa); | |
8794 | ++pa; | |
8795 | } | |
8796 | for (; pa != this->args_->end(); ++pa, ++pp) | |
8797 | { | |
8798 | go_assert(pp != fntype->parameters()->end()); | |
8799 | if (Type::are_identical(pp->type(), (*pa)->type(), true, NULL)) | |
8800 | args->push_back(*pa); | |
8801 | else | |
8802 | { | |
8803 | Location loc = (*pa)->location(); | |
8ba8cc87 | 8804 | Expression* arg = *pa; |
8805 | if (!arg->is_variable()) | |
8806 | { | |
8807 | Temporary_statement *temp = | |
8808 | Statement::make_temporary(NULL, arg, loc); | |
8809 | inserter->insert(temp); | |
8810 | arg = Expression::make_temporary_reference(temp, loc); | |
8811 | } | |
8812 | arg = Expression::convert_for_assignment(gogo, pp->type(), arg, | |
8813 | loc); | |
8814 | args->push_back(arg); | |
b8e86a51 | 8815 | } |
8816 | } | |
8817 | delete this->args_; | |
8818 | this->args_ = args; | |
8819 | } | |
8820 | ||
2c809f8f | 8821 | size_t rc = this->result_count(); |
8822 | if (rc > 1 && this->call_temp_ == NULL) | |
8823 | { | |
8824 | Struct_field_list* sfl = new Struct_field_list(); | |
8825 | Function_type* fntype = this->get_function_type(); | |
8826 | const Typed_identifier_list* results = fntype->results(); | |
8827 | Location loc = this->location(); | |
8828 | ||
8829 | int i = 0; | |
8830 | char buf[10]; | |
8831 | for (Typed_identifier_list::const_iterator p = results->begin(); | |
8832 | p != results->end(); | |
8833 | ++p, ++i) | |
8834 | { | |
8835 | snprintf(buf, sizeof buf, "res%d", i); | |
8836 | sfl->push_back(Struct_field(Typed_identifier(buf, p->type(), loc))); | |
8837 | } | |
8838 | ||
8839 | Struct_type* st = Type::make_struct_type(sfl, loc); | |
8840 | this->call_temp_ = Statement::make_temporary(st, NULL, loc); | |
8841 | inserter->insert(this->call_temp_); | |
8842 | } | |
8843 | ||
8844 | return this; | |
8845 | } | |
8846 | ||
ceeb4318 | 8847 | // Get the function type. This can return NULL in error cases. |
e440a328 | 8848 | |
8849 | Function_type* | |
8850 | Call_expression::get_function_type() const | |
8851 | { | |
8852 | return this->fn_->type()->function_type(); | |
8853 | } | |
8854 | ||
8855 | // Return the number of values which this call will return. | |
8856 | ||
8857 | size_t | |
8858 | Call_expression::result_count() const | |
8859 | { | |
8860 | const Function_type* fntype = this->get_function_type(); | |
8861 | if (fntype == NULL) | |
8862 | return 0; | |
8863 | if (fntype->results() == NULL) | |
8864 | return 0; | |
8865 | return fntype->results()->size(); | |
8866 | } | |
8867 | ||
ceeb4318 | 8868 | // Return the temporary which holds a result. |
8869 | ||
8870 | Temporary_statement* | |
8871 | Call_expression::result(size_t i) const | |
8872 | { | |
cd238b8d | 8873 | if (this->results_ == NULL || this->results_->size() <= i) |
8874 | { | |
8875 | go_assert(saw_errors()); | |
8876 | return NULL; | |
8877 | } | |
ceeb4318 | 8878 | return (*this->results_)[i]; |
8879 | } | |
8880 | ||
1373401e | 8881 | // Set the number of results expected from a call expression. |
8882 | ||
8883 | void | |
8884 | Call_expression::set_expected_result_count(size_t count) | |
8885 | { | |
8886 | go_assert(this->expected_result_count_ == 0); | |
8887 | this->expected_result_count_ = count; | |
8888 | } | |
8889 | ||
e440a328 | 8890 | // Return whether this is a call to the predeclared function recover. |
8891 | ||
8892 | bool | |
8893 | Call_expression::is_recover_call() const | |
8894 | { | |
8895 | return this->do_is_recover_call(); | |
8896 | } | |
8897 | ||
8898 | // Set the argument to the recover function. | |
8899 | ||
8900 | void | |
8901 | Call_expression::set_recover_arg(Expression* arg) | |
8902 | { | |
8903 | this->do_set_recover_arg(arg); | |
8904 | } | |
8905 | ||
8906 | // Virtual functions also implemented by Builtin_call_expression. | |
8907 | ||
8908 | bool | |
8909 | Call_expression::do_is_recover_call() const | |
8910 | { | |
8911 | return false; | |
8912 | } | |
8913 | ||
8914 | void | |
8915 | Call_expression::do_set_recover_arg(Expression*) | |
8916 | { | |
c3e6f413 | 8917 | go_unreachable(); |
e440a328 | 8918 | } |
8919 | ||
ceeb4318 | 8920 | // We have found an error with this call expression; return true if |
8921 | // we should report it. | |
8922 | ||
8923 | bool | |
8924 | Call_expression::issue_error() | |
8925 | { | |
8926 | if (this->issued_error_) | |
8927 | return false; | |
8928 | else | |
8929 | { | |
8930 | this->issued_error_ = true; | |
8931 | return true; | |
8932 | } | |
8933 | } | |
8934 | ||
5bf8be8b | 8935 | // Whether or not this call contains errors, either in the call or the |
8936 | // arguments to the call. | |
8937 | ||
8938 | bool | |
8939 | Call_expression::is_erroneous_call() | |
8940 | { | |
8941 | if (this->is_error_expression() || this->fn()->is_error_expression()) | |
8942 | return true; | |
8943 | ||
8944 | if (this->args() == NULL) | |
8945 | return false; | |
8946 | for (Expression_list::iterator pa = this->args()->begin(); | |
8947 | pa != this->args()->end(); | |
8948 | ++pa) | |
8949 | { | |
8950 | if ((*pa)->type()->is_error_type() || (*pa)->is_error_expression()) | |
8951 | return true; | |
8952 | } | |
8953 | return false; | |
8954 | } | |
8955 | ||
e440a328 | 8956 | // Get the type. |
8957 | ||
8958 | Type* | |
8959 | Call_expression::do_type() | |
8960 | { | |
8961 | if (this->type_ != NULL) | |
8962 | return this->type_; | |
8963 | ||
8964 | Type* ret; | |
8965 | Function_type* fntype = this->get_function_type(); | |
8966 | if (fntype == NULL) | |
8967 | return Type::make_error_type(); | |
8968 | ||
8969 | const Typed_identifier_list* results = fntype->results(); | |
8970 | if (results == NULL) | |
8971 | ret = Type::make_void_type(); | |
8972 | else if (results->size() == 1) | |
8973 | ret = results->begin()->type(); | |
8974 | else | |
8975 | ret = Type::make_call_multiple_result_type(this); | |
8976 | ||
8977 | this->type_ = ret; | |
8978 | ||
8979 | return this->type_; | |
8980 | } | |
8981 | ||
8982 | // Determine types for a call expression. We can use the function | |
8983 | // parameter types to set the types of the arguments. | |
8984 | ||
8985 | void | |
8986 | Call_expression::do_determine_type(const Type_context*) | |
8987 | { | |
fb94b0ca | 8988 | if (!this->determining_types()) |
8989 | return; | |
8990 | ||
e440a328 | 8991 | this->fn_->determine_type_no_context(); |
8992 | Function_type* fntype = this->get_function_type(); | |
8993 | const Typed_identifier_list* parameters = NULL; | |
8994 | if (fntype != NULL) | |
8995 | parameters = fntype->parameters(); | |
8996 | if (this->args_ != NULL) | |
8997 | { | |
8998 | Typed_identifier_list::const_iterator pt; | |
8999 | if (parameters != NULL) | |
9000 | pt = parameters->begin(); | |
09ea332d | 9001 | bool first = true; |
e440a328 | 9002 | for (Expression_list::const_iterator pa = this->args_->begin(); |
9003 | pa != this->args_->end(); | |
9004 | ++pa) | |
9005 | { | |
09ea332d | 9006 | if (first) |
9007 | { | |
9008 | first = false; | |
9009 | // If this is a method, the first argument is the | |
9010 | // receiver. | |
9011 | if (fntype != NULL && fntype->is_method()) | |
9012 | { | |
9013 | Type* rtype = fntype->receiver()->type(); | |
9014 | // The receiver is always passed as a pointer. | |
9015 | if (rtype->points_to() == NULL) | |
9016 | rtype = Type::make_pointer_type(rtype); | |
9017 | Type_context subcontext(rtype, false); | |
9018 | (*pa)->determine_type(&subcontext); | |
9019 | continue; | |
9020 | } | |
9021 | } | |
9022 | ||
e440a328 | 9023 | if (parameters != NULL && pt != parameters->end()) |
9024 | { | |
9025 | Type_context subcontext(pt->type(), false); | |
9026 | (*pa)->determine_type(&subcontext); | |
9027 | ++pt; | |
9028 | } | |
9029 | else | |
9030 | (*pa)->determine_type_no_context(); | |
9031 | } | |
9032 | } | |
9033 | } | |
9034 | ||
fb94b0ca | 9035 | // Called when determining types for a Call_expression. Return true |
9036 | // if we should go ahead, false if they have already been determined. | |
9037 | ||
9038 | bool | |
9039 | Call_expression::determining_types() | |
9040 | { | |
9041 | if (this->types_are_determined_) | |
9042 | return false; | |
9043 | else | |
9044 | { | |
9045 | this->types_are_determined_ = true; | |
9046 | return true; | |
9047 | } | |
9048 | } | |
9049 | ||
e440a328 | 9050 | // Check types for parameter I. |
9051 | ||
9052 | bool | |
9053 | Call_expression::check_argument_type(int i, const Type* parameter_type, | |
9054 | const Type* argument_type, | |
b13c66cd | 9055 | Location argument_location, |
e440a328 | 9056 | bool issued_error) |
9057 | { | |
9058 | std::string reason; | |
1eae365b | 9059 | if (!Type::are_assignable(parameter_type, argument_type, &reason)) |
e440a328 | 9060 | { |
9061 | if (!issued_error) | |
9062 | { | |
9063 | if (reason.empty()) | |
9064 | error_at(argument_location, "argument %d has incompatible type", i); | |
9065 | else | |
9066 | error_at(argument_location, | |
9067 | "argument %d has incompatible type (%s)", | |
9068 | i, reason.c_str()); | |
9069 | } | |
9070 | this->set_is_error(); | |
9071 | return false; | |
9072 | } | |
9073 | return true; | |
9074 | } | |
9075 | ||
9076 | // Check types. | |
9077 | ||
9078 | void | |
9079 | Call_expression::do_check_types(Gogo*) | |
9080 | { | |
a6645f74 | 9081 | if (this->classification() == EXPRESSION_ERROR) |
9082 | return; | |
9083 | ||
e440a328 | 9084 | Function_type* fntype = this->get_function_type(); |
9085 | if (fntype == NULL) | |
9086 | { | |
5c13bd80 | 9087 | if (!this->fn_->type()->is_error()) |
e440a328 | 9088 | this->report_error(_("expected function")); |
9089 | return; | |
9090 | } | |
9091 | ||
1373401e | 9092 | if (this->expected_result_count_ != 0 |
9093 | && this->expected_result_count_ != this->result_count()) | |
9094 | { | |
9095 | if (this->issue_error()) | |
9096 | this->report_error(_("function result count mismatch")); | |
9097 | this->set_is_error(); | |
9098 | return; | |
9099 | } | |
9100 | ||
09ea332d | 9101 | bool is_method = fntype->is_method(); |
9102 | if (is_method) | |
e440a328 | 9103 | { |
09ea332d | 9104 | go_assert(this->args_ != NULL && !this->args_->empty()); |
9105 | Type* rtype = fntype->receiver()->type(); | |
9106 | Expression* first_arg = this->args_->front(); | |
1eae365b | 9107 | // We dereference the values since receivers are always passed |
9108 | // as pointers. | |
09ea332d | 9109 | std::string reason; |
1eae365b | 9110 | if (!Type::are_assignable(rtype->deref(), first_arg->type()->deref(), |
9111 | &reason)) | |
e440a328 | 9112 | { |
09ea332d | 9113 | if (reason.empty()) |
9114 | this->report_error(_("incompatible type for receiver")); | |
9115 | else | |
e440a328 | 9116 | { |
09ea332d | 9117 | error_at(this->location(), |
9118 | "incompatible type for receiver (%s)", | |
9119 | reason.c_str()); | |
9120 | this->set_is_error(); | |
e440a328 | 9121 | } |
9122 | } | |
9123 | } | |
9124 | ||
9125 | // Note that varargs was handled by the lower_varargs() method, so | |
a6645f74 | 9126 | // we don't have to worry about it here unless something is wrong. |
9127 | if (this->is_varargs_ && !this->varargs_are_lowered_) | |
9128 | { | |
9129 | if (!fntype->is_varargs()) | |
9130 | { | |
9131 | error_at(this->location(), | |
9132 | _("invalid use of %<...%> calling non-variadic function")); | |
9133 | this->set_is_error(); | |
9134 | return; | |
9135 | } | |
9136 | } | |
e440a328 | 9137 | |
9138 | const Typed_identifier_list* parameters = fntype->parameters(); | |
9139 | if (this->args_ == NULL) | |
9140 | { | |
9141 | if (parameters != NULL && !parameters->empty()) | |
9142 | this->report_error(_("not enough arguments")); | |
9143 | } | |
9144 | else if (parameters == NULL) | |
09ea332d | 9145 | { |
9146 | if (!is_method || this->args_->size() > 1) | |
9147 | this->report_error(_("too many arguments")); | |
9148 | } | |
1373401e | 9149 | else if (this->args_->size() == 1 |
9150 | && this->args_->front()->call_expression() != NULL | |
9151 | && this->args_->front()->call_expression()->result_count() > 1) | |
9152 | { | |
9153 | // This is F(G()) when G returns more than one result. If the | |
9154 | // results can be matched to parameters, it would have been | |
9155 | // lowered in do_lower. If we get here we know there is a | |
9156 | // mismatch. | |
9157 | if (this->args_->front()->call_expression()->result_count() | |
9158 | < parameters->size()) | |
9159 | this->report_error(_("not enough arguments")); | |
9160 | else | |
9161 | this->report_error(_("too many arguments")); | |
9162 | } | |
e440a328 | 9163 | else |
9164 | { | |
9165 | int i = 0; | |
09ea332d | 9166 | Expression_list::const_iterator pa = this->args_->begin(); |
9167 | if (is_method) | |
9168 | ++pa; | |
9169 | for (Typed_identifier_list::const_iterator pt = parameters->begin(); | |
9170 | pt != parameters->end(); | |
9171 | ++pt, ++pa, ++i) | |
e440a328 | 9172 | { |
09ea332d | 9173 | if (pa == this->args_->end()) |
e440a328 | 9174 | { |
09ea332d | 9175 | this->report_error(_("not enough arguments")); |
e440a328 | 9176 | return; |
9177 | } | |
9178 | this->check_argument_type(i + 1, pt->type(), (*pa)->type(), | |
9179 | (*pa)->location(), false); | |
9180 | } | |
09ea332d | 9181 | if (pa != this->args_->end()) |
9182 | this->report_error(_("too many arguments")); | |
e440a328 | 9183 | } |
9184 | } | |
9185 | ||
72666aed | 9186 | Expression* |
9187 | Call_expression::do_copy() | |
9188 | { | |
9189 | Call_expression* call = | |
9190 | Expression::make_call(this->fn_->copy(), | |
9191 | (this->args_ == NULL | |
9192 | ? NULL | |
9193 | : this->args_->copy()), | |
9194 | this->is_varargs_, this->location()); | |
9195 | ||
9196 | if (this->varargs_are_lowered_) | |
9197 | call->set_varargs_are_lowered(); | |
9198 | return call; | |
9199 | } | |
9200 | ||
e440a328 | 9201 | // Return whether we have to use a temporary variable to ensure that |
9202 | // we evaluate this call expression in order. If the call returns no | |
ceeb4318 | 9203 | // results then it will inevitably be executed last. |
e440a328 | 9204 | |
9205 | bool | |
9206 | Call_expression::do_must_eval_in_order() const | |
9207 | { | |
ceeb4318 | 9208 | return this->result_count() > 0; |
e440a328 | 9209 | } |
9210 | ||
e440a328 | 9211 | // Get the function and the first argument to use when calling an |
9212 | // interface method. | |
9213 | ||
2387f644 | 9214 | Expression* |
e440a328 | 9215 | Call_expression::interface_method_function( |
e440a328 | 9216 | Interface_field_reference_expression* interface_method, |
2387f644 | 9217 | Expression** first_arg_ptr) |
e440a328 | 9218 | { |
2387f644 | 9219 | *first_arg_ptr = interface_method->get_underlying_object(); |
9220 | return interface_method->get_function(); | |
e440a328 | 9221 | } |
9222 | ||
9223 | // Build the call expression. | |
9224 | ||
ea664253 | 9225 | Bexpression* |
9226 | Call_expression::do_get_backend(Translate_context* context) | |
e440a328 | 9227 | { |
2c809f8f | 9228 | if (this->call_ != NULL) |
ea664253 | 9229 | return this->call_; |
e440a328 | 9230 | |
9231 | Function_type* fntype = this->get_function_type(); | |
9232 | if (fntype == NULL) | |
ea664253 | 9233 | return context->backend()->error_expression(); |
e440a328 | 9234 | |
9235 | if (this->fn_->is_error_expression()) | |
ea664253 | 9236 | return context->backend()->error_expression(); |
e440a328 | 9237 | |
9238 | Gogo* gogo = context->gogo(); | |
b13c66cd | 9239 | Location location = this->location(); |
e440a328 | 9240 | |
9241 | Func_expression* func = this->fn_->func_expression(); | |
e440a328 | 9242 | Interface_field_reference_expression* interface_method = |
9243 | this->fn_->interface_field_reference_expression(); | |
9244 | const bool has_closure = func != NULL && func->closure() != NULL; | |
09ea332d | 9245 | const bool is_interface_method = interface_method != NULL; |
e440a328 | 9246 | |
f8bdf81a | 9247 | bool has_closure_arg; |
8381eda7 | 9248 | if (has_closure) |
f8bdf81a | 9249 | has_closure_arg = true; |
8381eda7 | 9250 | else if (func != NULL) |
f8bdf81a | 9251 | has_closure_arg = false; |
8381eda7 | 9252 | else if (is_interface_method) |
f8bdf81a | 9253 | has_closure_arg = false; |
8381eda7 | 9254 | else |
f8bdf81a | 9255 | has_closure_arg = true; |
8381eda7 | 9256 | |
e440a328 | 9257 | int nargs; |
2c809f8f | 9258 | std::vector<Bexpression*> fn_args; |
e440a328 | 9259 | if (this->args_ == NULL || this->args_->empty()) |
9260 | { | |
f8bdf81a | 9261 | nargs = is_interface_method ? 1 : 0; |
2c809f8f | 9262 | if (nargs > 0) |
9263 | fn_args.resize(1); | |
e440a328 | 9264 | } |
09ea332d | 9265 | else if (fntype->parameters() == NULL || fntype->parameters()->empty()) |
9266 | { | |
9267 | // Passing a receiver parameter. | |
9268 | go_assert(!is_interface_method | |
9269 | && fntype->is_method() | |
9270 | && this->args_->size() == 1); | |
f8bdf81a | 9271 | nargs = 1; |
2c809f8f | 9272 | fn_args.resize(1); |
ea664253 | 9273 | fn_args[0] = this->args_->front()->get_backend(context); |
09ea332d | 9274 | } |
e440a328 | 9275 | else |
9276 | { | |
9277 | const Typed_identifier_list* params = fntype->parameters(); | |
e440a328 | 9278 | |
9279 | nargs = this->args_->size(); | |
09ea332d | 9280 | int i = is_interface_method ? 1 : 0; |
e440a328 | 9281 | nargs += i; |
2c809f8f | 9282 | fn_args.resize(nargs); |
e440a328 | 9283 | |
9284 | Typed_identifier_list::const_iterator pp = params->begin(); | |
09ea332d | 9285 | Expression_list::const_iterator pe = this->args_->begin(); |
9286 | if (!is_interface_method && fntype->is_method()) | |
9287 | { | |
ea664253 | 9288 | fn_args[i] = (*pe)->get_backend(context); |
09ea332d | 9289 | ++pe; |
9290 | ++i; | |
9291 | } | |
9292 | for (; pe != this->args_->end(); ++pe, ++pp, ++i) | |
e440a328 | 9293 | { |
c484d925 | 9294 | go_assert(pp != params->end()); |
2c809f8f | 9295 | Expression* arg = |
9296 | Expression::convert_for_assignment(gogo, pp->type(), *pe, | |
9297 | location); | |
ea664253 | 9298 | fn_args[i] = arg->get_backend(context); |
e440a328 | 9299 | } |
c484d925 | 9300 | go_assert(pp == params->end()); |
f8bdf81a | 9301 | go_assert(i == nargs); |
e440a328 | 9302 | } |
9303 | ||
2c809f8f | 9304 | Expression* fn; |
9305 | Expression* closure = NULL; | |
8381eda7 | 9306 | if (func != NULL) |
9307 | { | |
9308 | Named_object* no = func->named_object(); | |
2c809f8f | 9309 | fn = Expression::make_func_code_reference(no, location); |
9310 | if (has_closure) | |
9311 | closure = func->closure(); | |
8381eda7 | 9312 | } |
09ea332d | 9313 | else if (!is_interface_method) |
8381eda7 | 9314 | { |
2c809f8f | 9315 | closure = this->fn_; |
9316 | ||
9317 | // The backend representation of this function type is a pointer | |
9318 | // to a struct whose first field is the actual function to call. | |
9319 | Type* pfntype = | |
9320 | Type::make_pointer_type( | |
9321 | Type::make_pointer_type(Type::make_void_type())); | |
9322 | fn = Expression::make_unsafe_cast(pfntype, this->fn_, location); | |
9323 | fn = Expression::make_unary(OPERATOR_MULT, fn, location); | |
9324 | } | |
e440a328 | 9325 | else |
cf609de4 | 9326 | { |
2387f644 | 9327 | Expression* first_arg; |
2c809f8f | 9328 | fn = this->interface_method_function(interface_method, &first_arg); |
ea664253 | 9329 | fn_args[0] = first_arg->get_backend(context); |
e440a328 | 9330 | } |
9331 | ||
1ecc6157 | 9332 | Bexpression* bclosure = NULL; |
9333 | if (has_closure_arg) | |
9334 | bclosure = closure->get_backend(context); | |
f8bdf81a | 9335 | else |
1ecc6157 | 9336 | go_assert(closure == NULL); |
f8bdf81a | 9337 | |
ea664253 | 9338 | Bexpression* bfn = fn->get_backend(context); |
80d1e1a8 | 9339 | |
9340 | // When not calling a named function directly, use a type conversion | |
9341 | // in case the type of the function is a recursive type which refers | |
9342 | // to itself. We don't do this for an interface method because 1) | |
9343 | // an interface method never refers to itself, so we always have a | |
9344 | // function type here; 2) we pass an extra first argument to an | |
9345 | // interface method, so fntype is not correct. | |
9346 | if (func == NULL && !is_interface_method) | |
9347 | { | |
9348 | Btype* bft = fntype->get_backend_fntype(gogo); | |
9349 | bfn = gogo->backend()->convert_expression(bft, bfn, location); | |
9350 | } | |
9351 | ||
1ecc6157 | 9352 | Bexpression* call = gogo->backend()->call_expression(bfn, fn_args, |
9353 | bclosure, location); | |
e440a328 | 9354 | |
2c809f8f | 9355 | if (this->results_ != NULL) |
e440a328 | 9356 | { |
2c809f8f | 9357 | go_assert(this->call_temp_ != NULL); |
9358 | Expression* call_ref = | |
9359 | Expression::make_temporary_reference(this->call_temp_, location); | |
ea664253 | 9360 | Bexpression* bcall_ref = call_ref->get_backend(context); |
2c809f8f | 9361 | Bstatement* assn_stmt = |
9362 | gogo->backend()->assignment_statement(bcall_ref, call, location); | |
e440a328 | 9363 | |
2c809f8f | 9364 | this->call_ = this->set_results(context, bcall_ref); |
e440a328 | 9365 | |
2c809f8f | 9366 | Bexpression* set_and_call = |
9367 | gogo->backend()->compound_expression(assn_stmt, this->call_, | |
9368 | location); | |
ea664253 | 9369 | return set_and_call; |
2c809f8f | 9370 | } |
e440a328 | 9371 | |
2c809f8f | 9372 | this->call_ = call; |
ea664253 | 9373 | return this->call_; |
e440a328 | 9374 | } |
9375 | ||
ceeb4318 | 9376 | // Set the result variables if this call returns multiple results. |
9377 | ||
2c809f8f | 9378 | Bexpression* |
9379 | Call_expression::set_results(Translate_context* context, Bexpression* call) | |
ceeb4318 | 9380 | { |
2c809f8f | 9381 | Gogo* gogo = context->gogo(); |
ceeb4318 | 9382 | |
2c809f8f | 9383 | Bexpression* results = NULL; |
b13c66cd | 9384 | Location loc = this->location(); |
2c809f8f | 9385 | |
ceeb4318 | 9386 | size_t rc = this->result_count(); |
2c809f8f | 9387 | for (size_t i = 0; i < rc; ++i) |
ceeb4318 | 9388 | { |
ceeb4318 | 9389 | Temporary_statement* temp = this->result(i); |
cd238b8d | 9390 | if (temp == NULL) |
9391 | { | |
9392 | go_assert(saw_errors()); | |
2c809f8f | 9393 | return gogo->backend()->error_expression(); |
cd238b8d | 9394 | } |
ceeb4318 | 9395 | Temporary_reference_expression* ref = |
9396 | Expression::make_temporary_reference(temp, loc); | |
9397 | ref->set_is_lvalue(); | |
ceeb4318 | 9398 | |
ea664253 | 9399 | Bexpression* result_ref = ref->get_backend(context); |
2c809f8f | 9400 | Bexpression* call_result = |
9401 | gogo->backend()->struct_field_expression(call, i, loc); | |
9402 | Bstatement* assn_stmt = | |
9403 | gogo->backend()->assignment_statement(result_ref, call_result, loc); | |
ceeb4318 | 9404 | |
2c809f8f | 9405 | Bexpression* result = |
9406 | gogo->backend()->compound_expression(assn_stmt, call_result, loc); | |
ceeb4318 | 9407 | |
2c809f8f | 9408 | if (results == NULL) |
9409 | results = result; | |
9410 | else | |
9411 | { | |
9412 | Bstatement* expr_stmt = gogo->backend()->expression_statement(result); | |
9413 | results = | |
9414 | gogo->backend()->compound_expression(expr_stmt, results, loc); | |
9415 | } | |
9416 | } | |
9417 | return results; | |
ceeb4318 | 9418 | } |
9419 | ||
d751bb78 | 9420 | // Dump ast representation for a call expressin. |
9421 | ||
9422 | void | |
9423 | Call_expression::do_dump_expression(Ast_dump_context* ast_dump_context) const | |
9424 | { | |
9425 | this->fn_->dump_expression(ast_dump_context); | |
9426 | ast_dump_context->ostream() << "("; | |
9427 | if (args_ != NULL) | |
9428 | ast_dump_context->dump_expression_list(this->args_); | |
9429 | ||
9430 | ast_dump_context->ostream() << ") "; | |
9431 | } | |
9432 | ||
e440a328 | 9433 | // Make a call expression. |
9434 | ||
9435 | Call_expression* | |
9436 | Expression::make_call(Expression* fn, Expression_list* args, bool is_varargs, | |
b13c66cd | 9437 | Location location) |
e440a328 | 9438 | { |
9439 | return new Call_expression(fn, args, is_varargs, location); | |
9440 | } | |
9441 | ||
da244e59 | 9442 | // Class Call_result_expression. |
e440a328 | 9443 | |
9444 | // Traverse a call result. | |
9445 | ||
9446 | int | |
9447 | Call_result_expression::do_traverse(Traverse* traverse) | |
9448 | { | |
9449 | if (traverse->remember_expression(this->call_)) | |
9450 | { | |
9451 | // We have already traversed the call expression. | |
9452 | return TRAVERSE_CONTINUE; | |
9453 | } | |
9454 | return Expression::traverse(&this->call_, traverse); | |
9455 | } | |
9456 | ||
9457 | // Get the type. | |
9458 | ||
9459 | Type* | |
9460 | Call_result_expression::do_type() | |
9461 | { | |
425dd051 | 9462 | if (this->classification() == EXPRESSION_ERROR) |
9463 | return Type::make_error_type(); | |
9464 | ||
e440a328 | 9465 | // THIS->CALL_ can be replaced with a temporary reference due to |
9466 | // Call_expression::do_must_eval_in_order when there is an error. | |
9467 | Call_expression* ce = this->call_->call_expression(); | |
9468 | if (ce == NULL) | |
5e85f268 | 9469 | { |
9470 | this->set_is_error(); | |
9471 | return Type::make_error_type(); | |
9472 | } | |
e440a328 | 9473 | Function_type* fntype = ce->get_function_type(); |
9474 | if (fntype == NULL) | |
5e85f268 | 9475 | { |
e37658e2 | 9476 | if (ce->issue_error()) |
99b3f06f | 9477 | { |
9478 | if (!ce->fn()->type()->is_error()) | |
9479 | this->report_error(_("expected function")); | |
9480 | } | |
5e85f268 | 9481 | this->set_is_error(); |
9482 | return Type::make_error_type(); | |
9483 | } | |
e440a328 | 9484 | const Typed_identifier_list* results = fntype->results(); |
ceeb4318 | 9485 | if (results == NULL || results->size() < 2) |
7b8d861f | 9486 | { |
ceeb4318 | 9487 | if (ce->issue_error()) |
9488 | this->report_error(_("number of results does not match " | |
9489 | "number of values")); | |
7b8d861f | 9490 | return Type::make_error_type(); |
9491 | } | |
e440a328 | 9492 | Typed_identifier_list::const_iterator pr = results->begin(); |
9493 | for (unsigned int i = 0; i < this->index_; ++i) | |
9494 | { | |
9495 | if (pr == results->end()) | |
425dd051 | 9496 | break; |
e440a328 | 9497 | ++pr; |
9498 | } | |
9499 | if (pr == results->end()) | |
425dd051 | 9500 | { |
ceeb4318 | 9501 | if (ce->issue_error()) |
9502 | this->report_error(_("number of results does not match " | |
9503 | "number of values")); | |
425dd051 | 9504 | return Type::make_error_type(); |
9505 | } | |
e440a328 | 9506 | return pr->type(); |
9507 | } | |
9508 | ||
425dd051 | 9509 | // Check the type. Just make sure that we trigger the warning in |
9510 | // do_type. | |
e440a328 | 9511 | |
9512 | void | |
9513 | Call_result_expression::do_check_types(Gogo*) | |
9514 | { | |
425dd051 | 9515 | this->type(); |
e440a328 | 9516 | } |
9517 | ||
9518 | // Determine the type. We have nothing to do here, but the 0 result | |
9519 | // needs to pass down to the caller. | |
9520 | ||
9521 | void | |
9522 | Call_result_expression::do_determine_type(const Type_context*) | |
9523 | { | |
fb94b0ca | 9524 | this->call_->determine_type_no_context(); |
e440a328 | 9525 | } |
9526 | ||
ea664253 | 9527 | // Return the backend representation. We just refer to the temporary set by the |
9528 | // call expression. We don't do this at lowering time because it makes it | |
ceeb4318 | 9529 | // hard to evaluate the call at the right time. |
e440a328 | 9530 | |
ea664253 | 9531 | Bexpression* |
9532 | Call_result_expression::do_get_backend(Translate_context* context) | |
e440a328 | 9533 | { |
ceeb4318 | 9534 | Call_expression* ce = this->call_->call_expression(); |
cd238b8d | 9535 | if (ce == NULL) |
9536 | { | |
9537 | go_assert(this->call_->is_error_expression()); | |
ea664253 | 9538 | return context->backend()->error_expression(); |
cd238b8d | 9539 | } |
ceeb4318 | 9540 | Temporary_statement* ts = ce->result(this->index_); |
cd238b8d | 9541 | if (ts == NULL) |
9542 | { | |
9543 | go_assert(saw_errors()); | |
ea664253 | 9544 | return context->backend()->error_expression(); |
cd238b8d | 9545 | } |
ceeb4318 | 9546 | Expression* ref = Expression::make_temporary_reference(ts, this->location()); |
ea664253 | 9547 | return ref->get_backend(context); |
e440a328 | 9548 | } |
9549 | ||
d751bb78 | 9550 | // Dump ast representation for a call result expression. |
9551 | ||
9552 | void | |
9553 | Call_result_expression::do_dump_expression(Ast_dump_context* ast_dump_context) | |
9554 | const | |
9555 | { | |
9556 | // FIXME: Wouldn't it be better if the call is assigned to a temporary | |
9557 | // (struct) and the fields are referenced instead. | |
9558 | ast_dump_context->ostream() << this->index_ << "@("; | |
9559 | ast_dump_context->dump_expression(this->call_); | |
9560 | ast_dump_context->ostream() << ")"; | |
9561 | } | |
9562 | ||
e440a328 | 9563 | // Make a reference to a single result of a call which returns |
9564 | // multiple results. | |
9565 | ||
9566 | Expression* | |
9567 | Expression::make_call_result(Call_expression* call, unsigned int index) | |
9568 | { | |
9569 | return new Call_result_expression(call, index); | |
9570 | } | |
9571 | ||
9572 | // Class Index_expression. | |
9573 | ||
9574 | // Traversal. | |
9575 | ||
9576 | int | |
9577 | Index_expression::do_traverse(Traverse* traverse) | |
9578 | { | |
9579 | if (Expression::traverse(&this->left_, traverse) == TRAVERSE_EXIT | |
9580 | || Expression::traverse(&this->start_, traverse) == TRAVERSE_EXIT | |
9581 | || (this->end_ != NULL | |
acf2b673 | 9582 | && Expression::traverse(&this->end_, traverse) == TRAVERSE_EXIT) |
9583 | || (this->cap_ != NULL | |
9584 | && Expression::traverse(&this->cap_, traverse) == TRAVERSE_EXIT)) | |
e440a328 | 9585 | return TRAVERSE_EXIT; |
9586 | return TRAVERSE_CONTINUE; | |
9587 | } | |
9588 | ||
9589 | // Lower an index expression. This converts the generic index | |
9590 | // expression into an array index, a string index, or a map index. | |
9591 | ||
9592 | Expression* | |
ceeb4318 | 9593 | Index_expression::do_lower(Gogo*, Named_object*, Statement_inserter*, int) |
e440a328 | 9594 | { |
b13c66cd | 9595 | Location location = this->location(); |
e440a328 | 9596 | Expression* left = this->left_; |
9597 | Expression* start = this->start_; | |
9598 | Expression* end = this->end_; | |
acf2b673 | 9599 | Expression* cap = this->cap_; |
e440a328 | 9600 | |
9601 | Type* type = left->type(); | |
5c13bd80 | 9602 | if (type->is_error()) |
d9f3743a | 9603 | { |
9604 | go_assert(saw_errors()); | |
9605 | return Expression::make_error(location); | |
9606 | } | |
b0cf7ddd | 9607 | else if (left->is_type_expression()) |
9608 | { | |
9609 | error_at(location, "attempt to index type expression"); | |
9610 | return Expression::make_error(location); | |
9611 | } | |
e440a328 | 9612 | else if (type->array_type() != NULL) |
acf2b673 | 9613 | return Expression::make_array_index(left, start, end, cap, location); |
e440a328 | 9614 | else if (type->points_to() != NULL |
9615 | && type->points_to()->array_type() != NULL | |
411eb89e | 9616 | && !type->points_to()->is_slice_type()) |
e440a328 | 9617 | { |
9618 | Expression* deref = Expression::make_unary(OPERATOR_MULT, left, | |
9619 | location); | |
38092374 | 9620 | |
9621 | // For an ordinary index into the array, the pointer will be | |
9622 | // dereferenced. For a slice it will not--the resulting slice | |
9623 | // will simply reuse the pointer, which is incorrect if that | |
9624 | // pointer is nil. | |
9625 | if (end != NULL || cap != NULL) | |
9626 | deref->issue_nil_check(); | |
9627 | ||
acf2b673 | 9628 | return Expression::make_array_index(deref, start, end, cap, location); |
e440a328 | 9629 | } |
9630 | else if (type->is_string_type()) | |
acf2b673 | 9631 | { |
9632 | if (cap != NULL) | |
9633 | { | |
9634 | error_at(location, "invalid 3-index slice of string"); | |
9635 | return Expression::make_error(location); | |
9636 | } | |
9637 | return Expression::make_string_index(left, start, end, location); | |
9638 | } | |
e440a328 | 9639 | else if (type->map_type() != NULL) |
9640 | { | |
acf2b673 | 9641 | if (end != NULL || cap != NULL) |
e440a328 | 9642 | { |
9643 | error_at(location, "invalid slice of map"); | |
9644 | return Expression::make_error(location); | |
9645 | } | |
6d4c2432 | 9646 | Map_index_expression* ret = Expression::make_map_index(left, start, |
9647 | location); | |
e440a328 | 9648 | if (this->is_lvalue_) |
9649 | ret->set_is_lvalue(); | |
9650 | return ret; | |
9651 | } | |
9652 | else | |
9653 | { | |
9654 | error_at(location, | |
9655 | "attempt to index object which is not array, string, or map"); | |
9656 | return Expression::make_error(location); | |
9657 | } | |
9658 | } | |
9659 | ||
acf2b673 | 9660 | // Write an indexed expression |
9661 | // (expr[expr:expr:expr], expr[expr:expr] or expr[expr]) to a dump context. | |
d751bb78 | 9662 | |
9663 | void | |
9664 | Index_expression::dump_index_expression(Ast_dump_context* ast_dump_context, | |
9665 | const Expression* expr, | |
9666 | const Expression* start, | |
acf2b673 | 9667 | const Expression* end, |
9668 | const Expression* cap) | |
d751bb78 | 9669 | { |
9670 | expr->dump_expression(ast_dump_context); | |
9671 | ast_dump_context->ostream() << "["; | |
9672 | start->dump_expression(ast_dump_context); | |
9673 | if (end != NULL) | |
9674 | { | |
9675 | ast_dump_context->ostream() << ":"; | |
9676 | end->dump_expression(ast_dump_context); | |
9677 | } | |
acf2b673 | 9678 | if (cap != NULL) |
9679 | { | |
9680 | ast_dump_context->ostream() << ":"; | |
9681 | cap->dump_expression(ast_dump_context); | |
9682 | } | |
d751bb78 | 9683 | ast_dump_context->ostream() << "]"; |
9684 | } | |
9685 | ||
9686 | // Dump ast representation for an index expression. | |
9687 | ||
9688 | void | |
9689 | Index_expression::do_dump_expression(Ast_dump_context* ast_dump_context) | |
9690 | const | |
9691 | { | |
9692 | Index_expression::dump_index_expression(ast_dump_context, this->left_, | |
acf2b673 | 9693 | this->start_, this->end_, this->cap_); |
d751bb78 | 9694 | } |
9695 | ||
e440a328 | 9696 | // Make an index expression. |
9697 | ||
9698 | Expression* | |
9699 | Expression::make_index(Expression* left, Expression* start, Expression* end, | |
acf2b673 | 9700 | Expression* cap, Location location) |
e440a328 | 9701 | { |
acf2b673 | 9702 | return new Index_expression(left, start, end, cap, location); |
e440a328 | 9703 | } |
9704 | ||
da244e59 | 9705 | // Class Array_index_expression. |
e440a328 | 9706 | |
9707 | // Array index traversal. | |
9708 | ||
9709 | int | |
9710 | Array_index_expression::do_traverse(Traverse* traverse) | |
9711 | { | |
9712 | if (Expression::traverse(&this->array_, traverse) == TRAVERSE_EXIT) | |
9713 | return TRAVERSE_EXIT; | |
9714 | if (Expression::traverse(&this->start_, traverse) == TRAVERSE_EXIT) | |
9715 | return TRAVERSE_EXIT; | |
9716 | if (this->end_ != NULL) | |
9717 | { | |
9718 | if (Expression::traverse(&this->end_, traverse) == TRAVERSE_EXIT) | |
9719 | return TRAVERSE_EXIT; | |
9720 | } | |
acf2b673 | 9721 | if (this->cap_ != NULL) |
9722 | { | |
9723 | if (Expression::traverse(&this->cap_, traverse) == TRAVERSE_EXIT) | |
9724 | return TRAVERSE_EXIT; | |
9725 | } | |
e440a328 | 9726 | return TRAVERSE_CONTINUE; |
9727 | } | |
9728 | ||
9729 | // Return the type of an array index. | |
9730 | ||
9731 | Type* | |
9732 | Array_index_expression::do_type() | |
9733 | { | |
9734 | if (this->type_ == NULL) | |
9735 | { | |
9736 | Array_type* type = this->array_->type()->array_type(); | |
9737 | if (type == NULL) | |
9738 | this->type_ = Type::make_error_type(); | |
9739 | else if (this->end_ == NULL) | |
9740 | this->type_ = type->element_type(); | |
411eb89e | 9741 | else if (type->is_slice_type()) |
e440a328 | 9742 | { |
9743 | // A slice of a slice has the same type as the original | |
9744 | // slice. | |
9745 | this->type_ = this->array_->type()->deref(); | |
9746 | } | |
9747 | else | |
9748 | { | |
9749 | // A slice of an array is a slice. | |
9750 | this->type_ = Type::make_array_type(type->element_type(), NULL); | |
9751 | } | |
9752 | } | |
9753 | return this->type_; | |
9754 | } | |
9755 | ||
9756 | // Set the type of an array index. | |
9757 | ||
9758 | void | |
9759 | Array_index_expression::do_determine_type(const Type_context*) | |
9760 | { | |
9761 | this->array_->determine_type_no_context(); | |
7917ad68 | 9762 | this->start_->determine_type_no_context(); |
e440a328 | 9763 | if (this->end_ != NULL) |
7917ad68 | 9764 | this->end_->determine_type_no_context(); |
acf2b673 | 9765 | if (this->cap_ != NULL) |
9766 | this->cap_->determine_type_no_context(); | |
e440a328 | 9767 | } |
9768 | ||
9769 | // Check types of an array index. | |
9770 | ||
9771 | void | |
9772 | Array_index_expression::do_check_types(Gogo*) | |
9773 | { | |
f6bc81e6 | 9774 | Numeric_constant nc; |
9775 | unsigned long v; | |
9776 | if (this->start_->type()->integer_type() == NULL | |
9777 | && !this->start_->type()->is_error() | |
9778 | && (!this->start_->numeric_constant_value(&nc) | |
9779 | || nc.to_unsigned_long(&v) == Numeric_constant::NC_UL_NOTINT)) | |
e440a328 | 9780 | this->report_error(_("index must be integer")); |
9781 | if (this->end_ != NULL | |
9782 | && this->end_->type()->integer_type() == NULL | |
99b3f06f | 9783 | && !this->end_->type()->is_error() |
9784 | && !this->end_->is_nil_expression() | |
f6bc81e6 | 9785 | && !this->end_->is_error_expression() |
9786 | && (!this->end_->numeric_constant_value(&nc) | |
9787 | || nc.to_unsigned_long(&v) == Numeric_constant::NC_UL_NOTINT)) | |
e440a328 | 9788 | this->report_error(_("slice end must be integer")); |
acf2b673 | 9789 | if (this->cap_ != NULL |
9790 | && this->cap_->type()->integer_type() == NULL | |
9791 | && !this->cap_->type()->is_error() | |
9792 | && !this->cap_->is_nil_expression() | |
9793 | && !this->cap_->is_error_expression() | |
9794 | && (!this->cap_->numeric_constant_value(&nc) | |
9795 | || nc.to_unsigned_long(&v) == Numeric_constant::NC_UL_NOTINT)) | |
9796 | this->report_error(_("slice capacity must be integer")); | |
e440a328 | 9797 | |
9798 | Array_type* array_type = this->array_->type()->array_type(); | |
f9c68f17 | 9799 | if (array_type == NULL) |
9800 | { | |
c484d925 | 9801 | go_assert(this->array_->type()->is_error()); |
f9c68f17 | 9802 | return; |
9803 | } | |
e440a328 | 9804 | |
9805 | unsigned int int_bits = | |
9806 | Type::lookup_integer_type("int")->integer_type()->bits(); | |
9807 | ||
0c77715b | 9808 | Numeric_constant lvalnc; |
e440a328 | 9809 | mpz_t lval; |
e440a328 | 9810 | bool lval_valid = (array_type->length() != NULL |
0c77715b | 9811 | && array_type->length()->numeric_constant_value(&lvalnc) |
9812 | && lvalnc.to_int(&lval)); | |
9813 | Numeric_constant inc; | |
e440a328 | 9814 | mpz_t ival; |
0bd5d859 | 9815 | bool ival_valid = false; |
0c77715b | 9816 | if (this->start_->numeric_constant_value(&inc) && inc.to_int(&ival)) |
e440a328 | 9817 | { |
0bd5d859 | 9818 | ival_valid = true; |
e440a328 | 9819 | if (mpz_sgn(ival) < 0 |
9820 | || mpz_sizeinbase(ival, 2) >= int_bits | |
9821 | || (lval_valid | |
9822 | && (this->end_ == NULL | |
9823 | ? mpz_cmp(ival, lval) >= 0 | |
9824 | : mpz_cmp(ival, lval) > 0))) | |
9825 | { | |
9826 | error_at(this->start_->location(), "array index out of bounds"); | |
9827 | this->set_is_error(); | |
9828 | } | |
9829 | } | |
9830 | if (this->end_ != NULL && !this->end_->is_nil_expression()) | |
9831 | { | |
0c77715b | 9832 | Numeric_constant enc; |
9833 | mpz_t eval; | |
acf2b673 | 9834 | bool eval_valid = false; |
0c77715b | 9835 | if (this->end_->numeric_constant_value(&enc) && enc.to_int(&eval)) |
e440a328 | 9836 | { |
acf2b673 | 9837 | eval_valid = true; |
0c77715b | 9838 | if (mpz_sgn(eval) < 0 |
9839 | || mpz_sizeinbase(eval, 2) >= int_bits | |
9840 | || (lval_valid && mpz_cmp(eval, lval) > 0)) | |
e440a328 | 9841 | { |
9842 | error_at(this->end_->location(), "array index out of bounds"); | |
9843 | this->set_is_error(); | |
9844 | } | |
0bd5d859 | 9845 | else if (ival_valid && mpz_cmp(ival, eval) > 0) |
9846 | this->report_error(_("inverted slice range")); | |
e440a328 | 9847 | } |
acf2b673 | 9848 | |
9849 | Numeric_constant cnc; | |
9850 | mpz_t cval; | |
9851 | if (this->cap_ != NULL | |
9852 | && this->cap_->numeric_constant_value(&cnc) && cnc.to_int(&cval)) | |
9853 | { | |
9854 | if (mpz_sgn(cval) < 0 | |
9855 | || mpz_sizeinbase(cval, 2) >= int_bits | |
9856 | || (lval_valid && mpz_cmp(cval, lval) > 0)) | |
9857 | { | |
9858 | error_at(this->cap_->location(), "array index out of bounds"); | |
9859 | this->set_is_error(); | |
9860 | } | |
9861 | else if (ival_valid && mpz_cmp(ival, cval) > 0) | |
9862 | { | |
9863 | error_at(this->cap_->location(), | |
9864 | "invalid slice index: capacity less than start"); | |
9865 | this->set_is_error(); | |
9866 | } | |
9867 | else if (eval_valid && mpz_cmp(eval, cval) > 0) | |
9868 | { | |
9869 | error_at(this->cap_->location(), | |
9870 | "invalid slice index: capacity less than length"); | |
9871 | this->set_is_error(); | |
9872 | } | |
9873 | mpz_clear(cval); | |
9874 | } | |
9875 | ||
9876 | if (eval_valid) | |
9877 | mpz_clear(eval); | |
e440a328 | 9878 | } |
0bd5d859 | 9879 | if (ival_valid) |
9880 | mpz_clear(ival); | |
0c77715b | 9881 | if (lval_valid) |
9882 | mpz_clear(lval); | |
e440a328 | 9883 | |
9884 | // A slice of an array requires an addressable array. A slice of a | |
9885 | // slice is always possible. | |
411eb89e | 9886 | if (this->end_ != NULL && !array_type->is_slice_type()) |
88ec30c8 | 9887 | { |
9888 | if (!this->array_->is_addressable()) | |
8da39c3b | 9889 | this->report_error(_("slice of unaddressable value")); |
88ec30c8 | 9890 | else |
9891 | this->array_->address_taken(true); | |
9892 | } | |
e440a328 | 9893 | } |
9894 | ||
2c809f8f | 9895 | // Flatten array indexing by using temporary variables for slices and indexes. |
35a54f17 | 9896 | |
9897 | Expression* | |
9898 | Array_index_expression::do_flatten(Gogo*, Named_object*, | |
9899 | Statement_inserter* inserter) | |
9900 | { | |
9901 | Location loc = this->location(); | |
5bf8be8b | 9902 | Expression* array = this->array_; |
9903 | Expression* start = this->start_; | |
9904 | Expression* end = this->end_; | |
9905 | Expression* cap = this->cap_; | |
9906 | if (array->is_error_expression() | |
9907 | || array->type()->is_error_type() | |
9908 | || start->is_error_expression() | |
9909 | || start->type()->is_error_type() | |
9910 | || (end != NULL | |
9911 | && (end->is_error_expression() || end->type()->is_error_type())) | |
9912 | || (cap != NULL | |
9913 | && (cap->is_error_expression() || cap->type()->is_error_type()))) | |
9914 | { | |
9915 | go_assert(saw_errors()); | |
9916 | return Expression::make_error(loc); | |
9917 | } | |
9918 | ||
2c809f8f | 9919 | Temporary_statement* temp; |
5bf8be8b | 9920 | if (array->type()->is_slice_type() && !array->is_variable()) |
35a54f17 | 9921 | { |
5bf8be8b | 9922 | temp = Statement::make_temporary(NULL, array, loc); |
35a54f17 | 9923 | inserter->insert(temp); |
9924 | this->array_ = Expression::make_temporary_reference(temp, loc); | |
9925 | } | |
5bf8be8b | 9926 | if (!start->is_variable()) |
2c809f8f | 9927 | { |
5bf8be8b | 9928 | temp = Statement::make_temporary(NULL, start, loc); |
2c809f8f | 9929 | inserter->insert(temp); |
9930 | this->start_ = Expression::make_temporary_reference(temp, loc); | |
9931 | } | |
5bf8be8b | 9932 | if (end != NULL |
9933 | && !end->is_nil_expression() | |
9934 | && !end->is_variable()) | |
2c809f8f | 9935 | { |
5bf8be8b | 9936 | temp = Statement::make_temporary(NULL, end, loc); |
2c809f8f | 9937 | inserter->insert(temp); |
9938 | this->end_ = Expression::make_temporary_reference(temp, loc); | |
9939 | } | |
5bf8be8b | 9940 | if (cap!= NULL && !cap->is_variable()) |
2c809f8f | 9941 | { |
5bf8be8b | 9942 | temp = Statement::make_temporary(NULL, cap, loc); |
2c809f8f | 9943 | inserter->insert(temp); |
9944 | this->cap_ = Expression::make_temporary_reference(temp, loc); | |
9945 | } | |
9946 | ||
35a54f17 | 9947 | return this; |
9948 | } | |
9949 | ||
e440a328 | 9950 | // Return whether this expression is addressable. |
9951 | ||
9952 | bool | |
9953 | Array_index_expression::do_is_addressable() const | |
9954 | { | |
9955 | // A slice expression is not addressable. | |
9956 | if (this->end_ != NULL) | |
9957 | return false; | |
9958 | ||
9959 | // An index into a slice is addressable. | |
411eb89e | 9960 | if (this->array_->type()->is_slice_type()) |
e440a328 | 9961 | return true; |
9962 | ||
9963 | // An index into an array is addressable if the array is | |
9964 | // addressable. | |
9965 | return this->array_->is_addressable(); | |
9966 | } | |
9967 | ||
ea664253 | 9968 | // Get the backend representation for an array index. |
e440a328 | 9969 | |
ea664253 | 9970 | Bexpression* |
9971 | Array_index_expression::do_get_backend(Translate_context* context) | |
e440a328 | 9972 | { |
e440a328 | 9973 | Array_type* array_type = this->array_->type()->array_type(); |
d8cd8e2d | 9974 | if (array_type == NULL) |
9975 | { | |
c484d925 | 9976 | go_assert(this->array_->type()->is_error()); |
ea664253 | 9977 | return context->backend()->error_expression(); |
d8cd8e2d | 9978 | } |
35a54f17 | 9979 | go_assert(!array_type->is_slice_type() || this->array_->is_variable()); |
e440a328 | 9980 | |
2c809f8f | 9981 | Location loc = this->location(); |
9982 | Gogo* gogo = context->gogo(); | |
9983 | ||
6dfedc16 | 9984 | Type* int_type = Type::lookup_integer_type("int"); |
9985 | Btype* int_btype = int_type->get_backend(gogo); | |
e440a328 | 9986 | |
2c809f8f | 9987 | // We need to convert the length and capacity to the Go "int" type here |
9988 | // because the length of a fixed-length array could be of type "uintptr" | |
9989 | // and gimple disallows binary operations between "uintptr" and other | |
9990 | // integer types. FIXME. | |
9991 | Bexpression* length = NULL; | |
a04bfdfc | 9992 | if (this->end_ == NULL || this->end_->is_nil_expression()) |
9993 | { | |
35a54f17 | 9994 | Expression* len = array_type->get_length(gogo, this->array_); |
ea664253 | 9995 | length = len->get_backend(context); |
2c809f8f | 9996 | length = gogo->backend()->convert_expression(int_btype, length, loc); |
a04bfdfc | 9997 | } |
9998 | ||
2c809f8f | 9999 | Bexpression* capacity = NULL; |
a04bfdfc | 10000 | if (this->end_ != NULL) |
10001 | { | |
35a54f17 | 10002 | Expression* cap = array_type->get_capacity(gogo, this->array_); |
ea664253 | 10003 | capacity = cap->get_backend(context); |
2c809f8f | 10004 | capacity = gogo->backend()->convert_expression(int_btype, capacity, loc); |
a04bfdfc | 10005 | } |
10006 | ||
2c809f8f | 10007 | Bexpression* cap_arg = capacity; |
acf2b673 | 10008 | if (this->cap_ != NULL) |
10009 | { | |
ea664253 | 10010 | cap_arg = this->cap_->get_backend(context); |
2c809f8f | 10011 | cap_arg = gogo->backend()->convert_expression(int_btype, cap_arg, loc); |
acf2b673 | 10012 | } |
10013 | ||
2c809f8f | 10014 | if (length == NULL) |
10015 | length = cap_arg; | |
e440a328 | 10016 | |
10017 | int code = (array_type->length() != NULL | |
10018 | ? (this->end_ == NULL | |
10019 | ? RUNTIME_ERROR_ARRAY_INDEX_OUT_OF_BOUNDS | |
10020 | : RUNTIME_ERROR_ARRAY_SLICE_OUT_OF_BOUNDS) | |
10021 | : (this->end_ == NULL | |
10022 | ? RUNTIME_ERROR_SLICE_INDEX_OUT_OF_BOUNDS | |
10023 | : RUNTIME_ERROR_SLICE_SLICE_OUT_OF_BOUNDS)); | |
ea664253 | 10024 | Bexpression* crash = gogo->runtime_error(code, loc)->get_backend(context); |
2c809f8f | 10025 | |
6dfedc16 | 10026 | if (this->start_->type()->integer_type() == NULL |
10027 | && !Type::are_convertible(int_type, this->start_->type(), NULL)) | |
10028 | { | |
10029 | go_assert(saw_errors()); | |
10030 | return context->backend()->error_expression(); | |
10031 | } | |
d9f3743a | 10032 | |
ea664253 | 10033 | Bexpression* bad_index = |
d9f3743a | 10034 | Expression::check_bounds(this->start_, loc)->get_backend(context); |
2c809f8f | 10035 | |
ea664253 | 10036 | Bexpression* start = this->start_->get_backend(context); |
2c809f8f | 10037 | start = gogo->backend()->convert_expression(int_btype, start, loc); |
10038 | Bexpression* start_too_large = | |
10039 | gogo->backend()->binary_expression((this->end_ == NULL | |
10040 | ? OPERATOR_GE | |
10041 | : OPERATOR_GT), | |
10042 | start, | |
10043 | (this->end_ == NULL | |
10044 | ? length | |
10045 | : capacity), | |
10046 | loc); | |
10047 | bad_index = gogo->backend()->binary_expression(OPERATOR_OROR, start_too_large, | |
10048 | bad_index, loc); | |
e440a328 | 10049 | |
10050 | if (this->end_ == NULL) | |
10051 | { | |
10052 | // Simple array indexing. This has to return an l-value, so | |
2c809f8f | 10053 | // wrap the index check into START. |
10054 | start = | |
10055 | gogo->backend()->conditional_expression(int_btype, bad_index, | |
10056 | crash, start, loc); | |
e440a328 | 10057 | |
2c809f8f | 10058 | Bexpression* ret; |
e440a328 | 10059 | if (array_type->length() != NULL) |
10060 | { | |
ea664253 | 10061 | Bexpression* array = this->array_->get_backend(context); |
2c809f8f | 10062 | ret = gogo->backend()->array_index_expression(array, start, loc); |
e440a328 | 10063 | } |
10064 | else | |
10065 | { | |
2c809f8f | 10066 | // Slice. |
10067 | Expression* valptr = | |
35a54f17 | 10068 | array_type->get_value_pointer(gogo, this->array_); |
ea664253 | 10069 | Bexpression* ptr = valptr->get_backend(context); |
2c809f8f | 10070 | ptr = gogo->backend()->pointer_offset_expression(ptr, start, loc); |
9b27b43c | 10071 | |
10072 | Type* ele_type = this->array_->type()->array_type()->element_type(); | |
10073 | Btype* ele_btype = ele_type->get_backend(gogo); | |
10074 | ret = gogo->backend()->indirect_expression(ele_btype, ptr, true, loc); | |
e440a328 | 10075 | } |
ea664253 | 10076 | return ret; |
e440a328 | 10077 | } |
10078 | ||
10079 | // Array slice. | |
10080 | ||
acf2b673 | 10081 | if (this->cap_ != NULL) |
10082 | { | |
2c809f8f | 10083 | Bexpression* bounds_bcheck = |
ea664253 | 10084 | Expression::check_bounds(this->cap_, loc)->get_backend(context); |
2c809f8f | 10085 | bad_index = |
10086 | gogo->backend()->binary_expression(OPERATOR_OROR, bounds_bcheck, | |
10087 | bad_index, loc); | |
10088 | cap_arg = gogo->backend()->convert_expression(int_btype, cap_arg, loc); | |
10089 | ||
10090 | Bexpression* cap_too_small = | |
10091 | gogo->backend()->binary_expression(OPERATOR_LT, cap_arg, start, loc); | |
10092 | Bexpression* cap_too_large = | |
10093 | gogo->backend()->binary_expression(OPERATOR_GT, cap_arg, capacity, loc); | |
10094 | Bexpression* bad_cap = | |
10095 | gogo->backend()->binary_expression(OPERATOR_OROR, cap_too_small, | |
10096 | cap_too_large, loc); | |
10097 | bad_index = gogo->backend()->binary_expression(OPERATOR_OROR, bad_cap, | |
10098 | bad_index, loc); | |
10099 | } | |
10100 | ||
10101 | Bexpression* end; | |
e440a328 | 10102 | if (this->end_->is_nil_expression()) |
2c809f8f | 10103 | end = length; |
e440a328 | 10104 | else |
10105 | { | |
2c809f8f | 10106 | Bexpression* bounds_bcheck = |
ea664253 | 10107 | Expression::check_bounds(this->end_, loc)->get_backend(context); |
e440a328 | 10108 | |
2c809f8f | 10109 | bad_index = |
10110 | gogo->backend()->binary_expression(OPERATOR_OROR, bounds_bcheck, | |
10111 | bad_index, loc); | |
e440a328 | 10112 | |
ea664253 | 10113 | end = this->end_->get_backend(context); |
2c809f8f | 10114 | end = gogo->backend()->convert_expression(int_btype, end, loc); |
10115 | Bexpression* end_too_small = | |
10116 | gogo->backend()->binary_expression(OPERATOR_LT, end, start, loc); | |
10117 | Bexpression* end_too_large = | |
10118 | gogo->backend()->binary_expression(OPERATOR_GT, end, cap_arg, loc); | |
10119 | Bexpression* bad_end = | |
10120 | gogo->backend()->binary_expression(OPERATOR_OROR, end_too_small, | |
10121 | end_too_large, loc); | |
10122 | bad_index = gogo->backend()->binary_expression(OPERATOR_OROR, bad_end, | |
10123 | bad_index, loc); | |
e440a328 | 10124 | } |
10125 | ||
35a54f17 | 10126 | Expression* valptr = array_type->get_value_pointer(gogo, this->array_); |
ea664253 | 10127 | Bexpression* val = valptr->get_backend(context); |
2c809f8f | 10128 | val = gogo->backend()->pointer_offset_expression(val, start, loc); |
e440a328 | 10129 | |
2c809f8f | 10130 | Bexpression* result_length = |
10131 | gogo->backend()->binary_expression(OPERATOR_MINUS, end, start, loc); | |
e440a328 | 10132 | |
2c809f8f | 10133 | Bexpression* result_capacity = |
10134 | gogo->backend()->binary_expression(OPERATOR_MINUS, cap_arg, start, loc); | |
e440a328 | 10135 | |
2c809f8f | 10136 | Btype* struct_btype = this->type()->get_backend(gogo); |
10137 | std::vector<Bexpression*> init; | |
10138 | init.push_back(val); | |
10139 | init.push_back(result_length); | |
10140 | init.push_back(result_capacity); | |
e440a328 | 10141 | |
2c809f8f | 10142 | Bexpression* ctor = |
10143 | gogo->backend()->constructor_expression(struct_btype, init, loc); | |
ea664253 | 10144 | return gogo->backend()->conditional_expression(struct_btype, bad_index, |
10145 | crash, ctor, loc); | |
e440a328 | 10146 | } |
10147 | ||
d751bb78 | 10148 | // Dump ast representation for an array index expression. |
10149 | ||
10150 | void | |
10151 | Array_index_expression::do_dump_expression(Ast_dump_context* ast_dump_context) | |
10152 | const | |
10153 | { | |
10154 | Index_expression::dump_index_expression(ast_dump_context, this->array_, | |
acf2b673 | 10155 | this->start_, this->end_, this->cap_); |
d751bb78 | 10156 | } |
10157 | ||
acf2b673 | 10158 | // Make an array index expression. END and CAP may be NULL. |
e440a328 | 10159 | |
10160 | Expression* | |
10161 | Expression::make_array_index(Expression* array, Expression* start, | |
acf2b673 | 10162 | Expression* end, Expression* cap, |
10163 | Location location) | |
e440a328 | 10164 | { |
acf2b673 | 10165 | return new Array_index_expression(array, start, end, cap, location); |
e440a328 | 10166 | } |
10167 | ||
10168 | // A string index. This is used for both indexing and slicing. | |
10169 | ||
10170 | class String_index_expression : public Expression | |
10171 | { | |
10172 | public: | |
10173 | String_index_expression(Expression* string, Expression* start, | |
b13c66cd | 10174 | Expression* end, Location location) |
e440a328 | 10175 | : Expression(EXPRESSION_STRING_INDEX, location), |
10176 | string_(string), start_(start), end_(end) | |
10177 | { } | |
10178 | ||
10179 | protected: | |
10180 | int | |
10181 | do_traverse(Traverse*); | |
10182 | ||
2c809f8f | 10183 | Expression* |
10184 | do_flatten(Gogo*, Named_object*, Statement_inserter*); | |
10185 | ||
e440a328 | 10186 | Type* |
10187 | do_type(); | |
10188 | ||
10189 | void | |
10190 | do_determine_type(const Type_context*); | |
10191 | ||
10192 | void | |
10193 | do_check_types(Gogo*); | |
10194 | ||
10195 | Expression* | |
10196 | do_copy() | |
10197 | { | |
10198 | return Expression::make_string_index(this->string_->copy(), | |
10199 | this->start_->copy(), | |
10200 | (this->end_ == NULL | |
10201 | ? NULL | |
10202 | : this->end_->copy()), | |
10203 | this->location()); | |
10204 | } | |
10205 | ||
baef9f7a | 10206 | bool |
10207 | do_must_eval_subexpressions_in_order(int* skip) const | |
10208 | { | |
10209 | *skip = 1; | |
10210 | return true; | |
10211 | } | |
10212 | ||
ea664253 | 10213 | Bexpression* |
10214 | do_get_backend(Translate_context*); | |
e440a328 | 10215 | |
d751bb78 | 10216 | void |
10217 | do_dump_expression(Ast_dump_context*) const; | |
10218 | ||
e440a328 | 10219 | private: |
10220 | // The string we are getting a value from. | |
10221 | Expression* string_; | |
10222 | // The start or only index. | |
10223 | Expression* start_; | |
10224 | // The end index of a slice. This may be NULL for a single index, | |
10225 | // or it may be a nil expression for the length of the string. | |
10226 | Expression* end_; | |
10227 | }; | |
10228 | ||
10229 | // String index traversal. | |
10230 | ||
10231 | int | |
10232 | String_index_expression::do_traverse(Traverse* traverse) | |
10233 | { | |
10234 | if (Expression::traverse(&this->string_, traverse) == TRAVERSE_EXIT) | |
10235 | return TRAVERSE_EXIT; | |
10236 | if (Expression::traverse(&this->start_, traverse) == TRAVERSE_EXIT) | |
10237 | return TRAVERSE_EXIT; | |
10238 | if (this->end_ != NULL) | |
10239 | { | |
10240 | if (Expression::traverse(&this->end_, traverse) == TRAVERSE_EXIT) | |
10241 | return TRAVERSE_EXIT; | |
10242 | } | |
10243 | return TRAVERSE_CONTINUE; | |
10244 | } | |
10245 | ||
2c809f8f | 10246 | Expression* |
10247 | String_index_expression::do_flatten(Gogo*, Named_object*, | |
10248 | Statement_inserter* inserter) | |
e440a328 | 10249 | { |
2c809f8f | 10250 | Location loc = this->location(); |
5bf8be8b | 10251 | Expression* string = this->string_; |
10252 | Expression* start = this->start_; | |
10253 | Expression* end = this->end_; | |
10254 | if (string->is_error_expression() | |
10255 | || string->type()->is_error_type() | |
10256 | || start->is_error_expression() | |
10257 | || start->type()->is_error_type() | |
10258 | || (end != NULL | |
10259 | && (end->is_error_expression() || end->type()->is_error_type()))) | |
10260 | { | |
10261 | go_assert(saw_errors()); | |
10262 | return Expression::make_error(loc); | |
10263 | } | |
10264 | ||
10265 | Temporary_statement* temp; | |
2c809f8f | 10266 | if (!this->string_->is_variable()) |
10267 | { | |
10268 | temp = Statement::make_temporary(NULL, this->string_, loc); | |
10269 | inserter->insert(temp); | |
10270 | this->string_ = Expression::make_temporary_reference(temp, loc); | |
10271 | } | |
10272 | if (!this->start_->is_variable()) | |
10273 | { | |
10274 | temp = Statement::make_temporary(NULL, this->start_, loc); | |
10275 | inserter->insert(temp); | |
10276 | this->start_ = Expression::make_temporary_reference(temp, loc); | |
10277 | } | |
10278 | if (this->end_ != NULL | |
10279 | && !this->end_->is_nil_expression() | |
10280 | && !this->end_->is_variable()) | |
10281 | { | |
10282 | temp = Statement::make_temporary(NULL, this->end_, loc); | |
10283 | inserter->insert(temp); | |
10284 | this->end_ = Expression::make_temporary_reference(temp, loc); | |
10285 | } | |
10286 | ||
10287 | return this; | |
10288 | } | |
10289 | ||
10290 | // Return the type of a string index. | |
10291 | ||
10292 | Type* | |
10293 | String_index_expression::do_type() | |
10294 | { | |
10295 | if (this->end_ == NULL) | |
10296 | return Type::lookup_integer_type("uint8"); | |
10297 | else | |
10298 | return this->string_->type(); | |
10299 | } | |
10300 | ||
10301 | // Determine the type of a string index. | |
10302 | ||
10303 | void | |
10304 | String_index_expression::do_determine_type(const Type_context*) | |
10305 | { | |
10306 | this->string_->determine_type_no_context(); | |
10307 | this->start_->determine_type_no_context(); | |
e440a328 | 10308 | if (this->end_ != NULL) |
93000773 | 10309 | this->end_->determine_type_no_context(); |
e440a328 | 10310 | } |
10311 | ||
10312 | // Check types of a string index. | |
10313 | ||
10314 | void | |
10315 | String_index_expression::do_check_types(Gogo*) | |
10316 | { | |
acdc230d | 10317 | Numeric_constant nc; |
10318 | unsigned long v; | |
10319 | if (this->start_->type()->integer_type() == NULL | |
10320 | && !this->start_->type()->is_error() | |
10321 | && (!this->start_->numeric_constant_value(&nc) | |
10322 | || nc.to_unsigned_long(&v) == Numeric_constant::NC_UL_NOTINT)) | |
e440a328 | 10323 | this->report_error(_("index must be integer")); |
10324 | if (this->end_ != NULL | |
10325 | && this->end_->type()->integer_type() == NULL | |
acdc230d | 10326 | && !this->end_->type()->is_error() |
10327 | && !this->end_->is_nil_expression() | |
10328 | && !this->end_->is_error_expression() | |
10329 | && (!this->end_->numeric_constant_value(&nc) | |
10330 | || nc.to_unsigned_long(&v) == Numeric_constant::NC_UL_NOTINT)) | |
e440a328 | 10331 | this->report_error(_("slice end must be integer")); |
10332 | ||
10333 | std::string sval; | |
10334 | bool sval_valid = this->string_->string_constant_value(&sval); | |
10335 | ||
0c77715b | 10336 | Numeric_constant inc; |
e440a328 | 10337 | mpz_t ival; |
0bd5d859 | 10338 | bool ival_valid = false; |
0c77715b | 10339 | if (this->start_->numeric_constant_value(&inc) && inc.to_int(&ival)) |
e440a328 | 10340 | { |
0bd5d859 | 10341 | ival_valid = true; |
e440a328 | 10342 | if (mpz_sgn(ival) < 0 |
b10f32fb | 10343 | || (sval_valid |
10344 | && (this->end_ == NULL | |
10345 | ? mpz_cmp_ui(ival, sval.length()) >= 0 | |
10346 | : mpz_cmp_ui(ival, sval.length()) > 0))) | |
e440a328 | 10347 | { |
10348 | error_at(this->start_->location(), "string index out of bounds"); | |
10349 | this->set_is_error(); | |
10350 | } | |
10351 | } | |
10352 | if (this->end_ != NULL && !this->end_->is_nil_expression()) | |
10353 | { | |
0c77715b | 10354 | Numeric_constant enc; |
10355 | mpz_t eval; | |
10356 | if (this->end_->numeric_constant_value(&enc) && enc.to_int(&eval)) | |
e440a328 | 10357 | { |
0c77715b | 10358 | if (mpz_sgn(eval) < 0 |
10359 | || (sval_valid && mpz_cmp_ui(eval, sval.length()) > 0)) | |
e440a328 | 10360 | { |
10361 | error_at(this->end_->location(), "string index out of bounds"); | |
10362 | this->set_is_error(); | |
10363 | } | |
0bd5d859 | 10364 | else if (ival_valid && mpz_cmp(ival, eval) > 0) |
10365 | this->report_error(_("inverted slice range")); | |
0c77715b | 10366 | mpz_clear(eval); |
e440a328 | 10367 | } |
10368 | } | |
0bd5d859 | 10369 | if (ival_valid) |
10370 | mpz_clear(ival); | |
e440a328 | 10371 | } |
10372 | ||
ea664253 | 10373 | // Get the backend representation for a string index. |
e440a328 | 10374 | |
ea664253 | 10375 | Bexpression* |
10376 | String_index_expression::do_get_backend(Translate_context* context) | |
e440a328 | 10377 | { |
b13c66cd | 10378 | Location loc = this->location(); |
2c809f8f | 10379 | Expression* string_arg = this->string_; |
10380 | if (this->string_->type()->points_to() != NULL) | |
10381 | string_arg = Expression::make_unary(OPERATOR_MULT, this->string_, loc); | |
e440a328 | 10382 | |
2c809f8f | 10383 | Expression* bad_index = Expression::check_bounds(this->start_, loc); |
e440a328 | 10384 | |
2c809f8f | 10385 | int code = (this->end_ == NULL |
10386 | ? RUNTIME_ERROR_STRING_INDEX_OUT_OF_BOUNDS | |
10387 | : RUNTIME_ERROR_STRING_SLICE_OUT_OF_BOUNDS); | |
e440a328 | 10388 | |
2c809f8f | 10389 | Gogo* gogo = context->gogo(); |
ea664253 | 10390 | Bexpression* crash = gogo->runtime_error(code, loc)->get_backend(context); |
1b1f2abf | 10391 | |
10392 | Type* int_type = Type::lookup_integer_type("int"); | |
e440a328 | 10393 | |
2c809f8f | 10394 | // It is possible that an error occurred earlier because the start index |
10395 | // cannot be represented as an integer type. In this case, we shouldn't | |
10396 | // try casting the starting index into an integer since | |
10397 | // Type_conversion_expression will fail to get the backend representation. | |
10398 | // FIXME. | |
10399 | if (this->start_->type()->integer_type() == NULL | |
10400 | && !Type::are_convertible(int_type, this->start_->type(), NULL)) | |
10401 | { | |
10402 | go_assert(saw_errors()); | |
ea664253 | 10403 | return context->backend()->error_expression(); |
2c809f8f | 10404 | } |
e440a328 | 10405 | |
2c809f8f | 10406 | Expression* start = Expression::make_cast(int_type, this->start_, loc); |
e440a328 | 10407 | |
2c809f8f | 10408 | if (this->end_ == NULL) |
10409 | { | |
10410 | Expression* length = | |
10411 | Expression::make_string_info(this->string_, STRING_INFO_LENGTH, loc); | |
e440a328 | 10412 | |
2c809f8f | 10413 | Expression* start_too_large = |
10414 | Expression::make_binary(OPERATOR_GE, start, length, loc); | |
10415 | bad_index = Expression::make_binary(OPERATOR_OROR, start_too_large, | |
10416 | bad_index, loc); | |
10417 | Expression* bytes = | |
10418 | Expression::make_string_info(this->string_, STRING_INFO_DATA, loc); | |
e440a328 | 10419 | |
ea664253 | 10420 | Bexpression* bstart = start->get_backend(context); |
10421 | Bexpression* ptr = bytes->get_backend(context); | |
2c809f8f | 10422 | ptr = gogo->backend()->pointer_offset_expression(ptr, bstart, loc); |
9b27b43c | 10423 | Btype* ubtype = Type::lookup_integer_type("uint8")->get_backend(gogo); |
10424 | Bexpression* index = | |
10425 | gogo->backend()->indirect_expression(ubtype, ptr, true, loc); | |
e440a328 | 10426 | |
2c809f8f | 10427 | Btype* byte_btype = bytes->type()->points_to()->get_backend(gogo); |
ea664253 | 10428 | Bexpression* index_error = bad_index->get_backend(context); |
10429 | return gogo->backend()->conditional_expression(byte_btype, index_error, | |
10430 | crash, index, loc); | |
2c809f8f | 10431 | } |
10432 | ||
10433 | Expression* end = NULL; | |
10434 | if (this->end_->is_nil_expression()) | |
e67508fa | 10435 | end = Expression::make_integer_sl(-1, int_type, loc); |
e440a328 | 10436 | else |
10437 | { | |
2c809f8f | 10438 | Expression* bounds_check = Expression::check_bounds(this->end_, loc); |
10439 | bad_index = | |
10440 | Expression::make_binary(OPERATOR_OROR, bounds_check, bad_index, loc); | |
10441 | end = Expression::make_cast(int_type, this->end_, loc); | |
e440a328 | 10442 | } |
2c809f8f | 10443 | |
10444 | Expression* strslice = Runtime::make_call(Runtime::STRING_SLICE, loc, 3, | |
10445 | string_arg, start, end); | |
ea664253 | 10446 | Bexpression* bstrslice = strslice->get_backend(context); |
2c809f8f | 10447 | |
10448 | Btype* str_btype = strslice->type()->get_backend(gogo); | |
ea664253 | 10449 | Bexpression* index_error = bad_index->get_backend(context); |
10450 | return gogo->backend()->conditional_expression(str_btype, index_error, | |
10451 | crash, bstrslice, loc); | |
e440a328 | 10452 | } |
10453 | ||
d751bb78 | 10454 | // Dump ast representation for a string index expression. |
10455 | ||
10456 | void | |
10457 | String_index_expression::do_dump_expression(Ast_dump_context* ast_dump_context) | |
10458 | const | |
10459 | { | |
acf2b673 | 10460 | Index_expression::dump_index_expression(ast_dump_context, this->string_, |
10461 | this->start_, this->end_, NULL); | |
d751bb78 | 10462 | } |
10463 | ||
e440a328 | 10464 | // Make a string index expression. END may be NULL. |
10465 | ||
10466 | Expression* | |
10467 | Expression::make_string_index(Expression* string, Expression* start, | |
b13c66cd | 10468 | Expression* end, Location location) |
e440a328 | 10469 | { |
10470 | return new String_index_expression(string, start, end, location); | |
10471 | } | |
10472 | ||
10473 | // Class Map_index. | |
10474 | ||
10475 | // Get the type of the map. | |
10476 | ||
10477 | Map_type* | |
10478 | Map_index_expression::get_map_type() const | |
10479 | { | |
10480 | Map_type* mt = this->map_->type()->deref()->map_type(); | |
c7524fae | 10481 | if (mt == NULL) |
c484d925 | 10482 | go_assert(saw_errors()); |
e440a328 | 10483 | return mt; |
10484 | } | |
10485 | ||
10486 | // Map index traversal. | |
10487 | ||
10488 | int | |
10489 | Map_index_expression::do_traverse(Traverse* traverse) | |
10490 | { | |
10491 | if (Expression::traverse(&this->map_, traverse) == TRAVERSE_EXIT) | |
10492 | return TRAVERSE_EXIT; | |
10493 | return Expression::traverse(&this->index_, traverse); | |
10494 | } | |
10495 | ||
2c809f8f | 10496 | // We need to pass in a pointer to the key, so flatten the index into a |
10497 | // temporary variable if it isn't already. The value pointer will be | |
10498 | // dereferenced and checked for nil, so flatten into a temporary to avoid | |
10499 | // recomputation. | |
10500 | ||
10501 | Expression* | |
91c0fd76 | 10502 | Map_index_expression::do_flatten(Gogo* gogo, Named_object*, |
2c809f8f | 10503 | Statement_inserter* inserter) |
10504 | { | |
91c0fd76 | 10505 | Location loc = this->location(); |
2c809f8f | 10506 | Map_type* mt = this->get_map_type(); |
5bf8be8b | 10507 | if (this->index()->is_error_expression() |
10508 | || this->index()->type()->is_error_type() | |
10509 | || mt->is_error_type()) | |
10510 | { | |
10511 | go_assert(saw_errors()); | |
10512 | return Expression::make_error(loc); | |
10513 | } | |
10514 | ||
91c0fd76 | 10515 | if (!Type::are_identical(mt->key_type(), this->index_->type(), false, NULL)) |
10516 | { | |
10517 | if (this->index_->type()->interface_type() != NULL | |
10518 | && !this->index_->is_variable()) | |
10519 | { | |
10520 | Temporary_statement* temp = | |
10521 | Statement::make_temporary(NULL, this->index_, loc); | |
10522 | inserter->insert(temp); | |
10523 | this->index_ = Expression::make_temporary_reference(temp, loc); | |
10524 | } | |
10525 | this->index_ = Expression::convert_for_assignment(gogo, mt->key_type(), | |
10526 | this->index_, loc); | |
10527 | } | |
2c809f8f | 10528 | |
10529 | if (!this->index_->is_variable()) | |
10530 | { | |
10531 | Temporary_statement* temp = Statement::make_temporary(NULL, this->index_, | |
91c0fd76 | 10532 | loc); |
2c809f8f | 10533 | inserter->insert(temp); |
91c0fd76 | 10534 | this->index_ = Expression::make_temporary_reference(temp, loc); |
2c809f8f | 10535 | } |
10536 | ||
10537 | if (this->value_pointer_ == NULL) | |
10538 | this->get_value_pointer(this->is_lvalue_); | |
5bf8be8b | 10539 | if (this->value_pointer_->is_error_expression() |
10540 | || this->value_pointer_->type()->is_error_type()) | |
10541 | return Expression::make_error(loc); | |
2c809f8f | 10542 | if (!this->value_pointer_->is_variable()) |
10543 | { | |
10544 | Temporary_statement* temp = | |
91c0fd76 | 10545 | Statement::make_temporary(NULL, this->value_pointer_, loc); |
2c809f8f | 10546 | inserter->insert(temp); |
91c0fd76 | 10547 | this->value_pointer_ = Expression::make_temporary_reference(temp, loc); |
2c809f8f | 10548 | } |
10549 | ||
10550 | return this; | |
10551 | } | |
10552 | ||
e440a328 | 10553 | // Return the type of a map index. |
10554 | ||
10555 | Type* | |
10556 | Map_index_expression::do_type() | |
10557 | { | |
c7524fae | 10558 | Map_type* mt = this->get_map_type(); |
10559 | if (mt == NULL) | |
10560 | return Type::make_error_type(); | |
10561 | Type* type = mt->val_type(); | |
e440a328 | 10562 | // If this map index is in a tuple assignment, we actually return a |
10563 | // pointer to the value type. Tuple_map_assignment_statement is | |
10564 | // responsible for handling this correctly. We need to get the type | |
10565 | // right in case this gets assigned to a temporary variable. | |
10566 | if (this->is_in_tuple_assignment_) | |
10567 | type = Type::make_pointer_type(type); | |
10568 | return type; | |
10569 | } | |
10570 | ||
10571 | // Fix the type of a map index. | |
10572 | ||
10573 | void | |
10574 | Map_index_expression::do_determine_type(const Type_context*) | |
10575 | { | |
10576 | this->map_->determine_type_no_context(); | |
c7524fae | 10577 | Map_type* mt = this->get_map_type(); |
10578 | Type* key_type = mt == NULL ? NULL : mt->key_type(); | |
10579 | Type_context subcontext(key_type, false); | |
e440a328 | 10580 | this->index_->determine_type(&subcontext); |
10581 | } | |
10582 | ||
10583 | // Check types of a map index. | |
10584 | ||
10585 | void | |
10586 | Map_index_expression::do_check_types(Gogo*) | |
10587 | { | |
10588 | std::string reason; | |
c7524fae | 10589 | Map_type* mt = this->get_map_type(); |
10590 | if (mt == NULL) | |
10591 | return; | |
10592 | if (!Type::are_assignable(mt->key_type(), this->index_->type(), &reason)) | |
e440a328 | 10593 | { |
10594 | if (reason.empty()) | |
10595 | this->report_error(_("incompatible type for map index")); | |
10596 | else | |
10597 | { | |
10598 | error_at(this->location(), "incompatible type for map index (%s)", | |
10599 | reason.c_str()); | |
10600 | this->set_is_error(); | |
10601 | } | |
10602 | } | |
10603 | } | |
10604 | ||
ea664253 | 10605 | // Get the backend representation for a map index. |
e440a328 | 10606 | |
ea664253 | 10607 | Bexpression* |
10608 | Map_index_expression::do_get_backend(Translate_context* context) | |
e440a328 | 10609 | { |
10610 | Map_type* type = this->get_map_type(); | |
c7524fae | 10611 | if (type == NULL) |
2c809f8f | 10612 | { |
10613 | go_assert(saw_errors()); | |
ea664253 | 10614 | return context->backend()->error_expression(); |
2c809f8f | 10615 | } |
e440a328 | 10616 | |
2c809f8f | 10617 | go_assert(this->value_pointer_ != NULL |
10618 | && this->value_pointer_->is_variable()); | |
e440a328 | 10619 | |
2c809f8f | 10620 | Bexpression* ret; |
e440a328 | 10621 | if (this->is_lvalue_) |
2c809f8f | 10622 | { |
10623 | Expression* val = | |
10624 | Expression::make_unary(OPERATOR_MULT, this->value_pointer_, | |
10625 | this->location()); | |
ea664253 | 10626 | ret = val->get_backend(context); |
2c809f8f | 10627 | } |
e440a328 | 10628 | else if (this->is_in_tuple_assignment_) |
10629 | { | |
10630 | // Tuple_map_assignment_statement is responsible for using this | |
10631 | // appropriately. | |
ea664253 | 10632 | ret = this->value_pointer_->get_backend(context); |
e440a328 | 10633 | } |
10634 | else | |
10635 | { | |
2c809f8f | 10636 | Location loc = this->location(); |
10637 | ||
10638 | Expression* nil_check = | |
10639 | Expression::make_binary(OPERATOR_EQEQ, this->value_pointer_, | |
10640 | Expression::make_nil(loc), loc); | |
ea664253 | 10641 | Bexpression* bnil_check = nil_check->get_backend(context); |
2c809f8f | 10642 | Expression* val = |
10643 | Expression::make_unary(OPERATOR_MULT, this->value_pointer_, loc); | |
ea664253 | 10644 | Bexpression* bval = val->get_backend(context); |
2c809f8f | 10645 | |
63697958 | 10646 | Gogo* gogo = context->gogo(); |
10647 | Btype* val_btype = type->val_type()->get_backend(gogo); | |
10648 | Bexpression* val_zero = gogo->backend()->zero_expression(val_btype); | |
2c809f8f | 10649 | ret = gogo->backend()->conditional_expression(val_btype, bnil_check, |
10650 | val_zero, bval, loc); | |
e440a328 | 10651 | } |
ea664253 | 10652 | return ret; |
e440a328 | 10653 | } |
10654 | ||
2c809f8f | 10655 | // Get an expression for the map index. This returns an expression which |
10656 | // evaluates to a pointer to a value. The pointer will be NULL if the key is | |
e440a328 | 10657 | // not in the map. |
10658 | ||
2c809f8f | 10659 | Expression* |
10660 | Map_index_expression::get_value_pointer(bool insert) | |
e440a328 | 10661 | { |
2c809f8f | 10662 | if (this->value_pointer_ == NULL) |
746d2e73 | 10663 | { |
2c809f8f | 10664 | Map_type* type = this->get_map_type(); |
10665 | if (type == NULL) | |
746d2e73 | 10666 | { |
2c809f8f | 10667 | go_assert(saw_errors()); |
10668 | return Expression::make_error(this->location()); | |
746d2e73 | 10669 | } |
e440a328 | 10670 | |
2c809f8f | 10671 | Location loc = this->location(); |
10672 | Expression* map_ref = this->map_; | |
10673 | if (this->map_->type()->points_to() != NULL) | |
10674 | map_ref = Expression::make_unary(OPERATOR_MULT, map_ref, loc); | |
e440a328 | 10675 | |
2c809f8f | 10676 | Expression* index_ptr = Expression::make_unary(OPERATOR_AND, this->index_, |
10677 | loc); | |
10678 | Expression* map_index = | |
10679 | Runtime::make_call(Runtime::MAP_INDEX, loc, 3, | |
10680 | map_ref, index_ptr, | |
10681 | Expression::make_boolean(insert, loc)); | |
10682 | ||
10683 | Type* val_type = type->val_type(); | |
10684 | this->value_pointer_ = | |
10685 | Expression::make_unsafe_cast(Type::make_pointer_type(val_type), | |
10686 | map_index, this->location()); | |
10687 | } | |
10688 | return this->value_pointer_; | |
e440a328 | 10689 | } |
10690 | ||
d751bb78 | 10691 | // Dump ast representation for a map index expression |
10692 | ||
10693 | void | |
10694 | Map_index_expression::do_dump_expression(Ast_dump_context* ast_dump_context) | |
10695 | const | |
10696 | { | |
acf2b673 | 10697 | Index_expression::dump_index_expression(ast_dump_context, this->map_, |
10698 | this->index_, NULL, NULL); | |
d751bb78 | 10699 | } |
10700 | ||
e440a328 | 10701 | // Make a map index expression. |
10702 | ||
10703 | Map_index_expression* | |
10704 | Expression::make_map_index(Expression* map, Expression* index, | |
b13c66cd | 10705 | Location location) |
e440a328 | 10706 | { |
10707 | return new Map_index_expression(map, index, location); | |
10708 | } | |
10709 | ||
10710 | // Class Field_reference_expression. | |
10711 | ||
149eabc5 | 10712 | // Lower a field reference expression. There is nothing to lower, but |
10713 | // this is where we generate the tracking information for fields with | |
10714 | // the magic go:"track" tag. | |
10715 | ||
10716 | Expression* | |
10717 | Field_reference_expression::do_lower(Gogo* gogo, Named_object* function, | |
10718 | Statement_inserter* inserter, int) | |
10719 | { | |
10720 | Struct_type* struct_type = this->expr_->type()->struct_type(); | |
10721 | if (struct_type == NULL) | |
10722 | { | |
10723 | // Error will be reported elsewhere. | |
10724 | return this; | |
10725 | } | |
10726 | const Struct_field* field = struct_type->field(this->field_index_); | |
10727 | if (field == NULL) | |
10728 | return this; | |
10729 | if (!field->has_tag()) | |
10730 | return this; | |
10731 | if (field->tag().find("go:\"track\"") == std::string::npos) | |
10732 | return this; | |
10733 | ||
604e278d | 10734 | // References from functions generated by the compiler don't count. |
c6292d1d | 10735 | if (function != NULL && function->func_value()->is_type_specific_function()) |
604e278d | 10736 | return this; |
10737 | ||
149eabc5 | 10738 | // We have found a reference to a tracked field. Build a call to |
10739 | // the runtime function __go_fieldtrack with a string that describes | |
10740 | // the field. FIXME: We should only call this once per referenced | |
10741 | // field per function, not once for each reference to the field. | |
10742 | ||
10743 | if (this->called_fieldtrack_) | |
10744 | return this; | |
10745 | this->called_fieldtrack_ = true; | |
10746 | ||
10747 | Location loc = this->location(); | |
10748 | ||
10749 | std::string s = "fieldtrack \""; | |
10750 | Named_type* nt = this->expr_->type()->named_type(); | |
10751 | if (nt == NULL || nt->named_object()->package() == NULL) | |
10752 | s.append(gogo->pkgpath()); | |
10753 | else | |
10754 | s.append(nt->named_object()->package()->pkgpath()); | |
10755 | s.push_back('.'); | |
10756 | if (nt != NULL) | |
5c29ad36 | 10757 | s.append(Gogo::unpack_hidden_name(nt->name())); |
149eabc5 | 10758 | s.push_back('.'); |
10759 | s.append(field->field_name()); | |
10760 | s.push_back('"'); | |
10761 | ||
10762 | // We can't use a string here, because internally a string holds a | |
10763 | // pointer to the actual bytes; when the linker garbage collects the | |
10764 | // string, it won't garbage collect the bytes. So we use a | |
10765 | // [...]byte. | |
10766 | ||
e67508fa | 10767 | Expression* length_expr = Expression::make_integer_ul(s.length(), NULL, loc); |
149eabc5 | 10768 | |
10769 | Type* byte_type = gogo->lookup_global("byte")->type_value(); | |
10770 | Type* array_type = Type::make_array_type(byte_type, length_expr); | |
10771 | ||
10772 | Expression_list* bytes = new Expression_list(); | |
10773 | for (std::string::const_iterator p = s.begin(); p != s.end(); p++) | |
10774 | { | |
e67508fa | 10775 | unsigned char c = static_cast<unsigned char>(*p); |
10776 | bytes->push_back(Expression::make_integer_ul(c, NULL, loc)); | |
149eabc5 | 10777 | } |
10778 | ||
10779 | Expression* e = Expression::make_composite_literal(array_type, 0, false, | |
62750cd5 | 10780 | bytes, false, loc); |
149eabc5 | 10781 | |
10782 | Variable* var = new Variable(array_type, e, true, false, false, loc); | |
10783 | ||
10784 | static int count; | |
10785 | char buf[50]; | |
10786 | snprintf(buf, sizeof buf, "fieldtrack.%d", count); | |
10787 | ++count; | |
10788 | ||
10789 | Named_object* no = gogo->add_variable(buf, var); | |
10790 | e = Expression::make_var_reference(no, loc); | |
10791 | e = Expression::make_unary(OPERATOR_AND, e, loc); | |
10792 | ||
10793 | Expression* call = Runtime::make_call(Runtime::FIELDTRACK, loc, 1, e); | |
604e278d | 10794 | gogo->lower_expression(function, inserter, &call); |
149eabc5 | 10795 | inserter->insert(Statement::make_statement(call, false)); |
10796 | ||
10797 | // Put this function, and the global variable we just created, into | |
10798 | // unique sections. This will permit the linker to garbage collect | |
10799 | // them if they are not referenced. The effect is that the only | |
10800 | // strings, indicating field references, that will wind up in the | |
10801 | // executable will be those for functions that are actually needed. | |
66a6be58 | 10802 | if (function != NULL) |
10803 | function->func_value()->set_in_unique_section(); | |
149eabc5 | 10804 | var->set_in_unique_section(); |
10805 | ||
10806 | return this; | |
10807 | } | |
10808 | ||
e440a328 | 10809 | // Return the type of a field reference. |
10810 | ||
10811 | Type* | |
10812 | Field_reference_expression::do_type() | |
10813 | { | |
b0e628fb | 10814 | Type* type = this->expr_->type(); |
5c13bd80 | 10815 | if (type->is_error()) |
b0e628fb | 10816 | return type; |
10817 | Struct_type* struct_type = type->struct_type(); | |
c484d925 | 10818 | go_assert(struct_type != NULL); |
e440a328 | 10819 | return struct_type->field(this->field_index_)->type(); |
10820 | } | |
10821 | ||
10822 | // Check the types for a field reference. | |
10823 | ||
10824 | void | |
10825 | Field_reference_expression::do_check_types(Gogo*) | |
10826 | { | |
b0e628fb | 10827 | Type* type = this->expr_->type(); |
5c13bd80 | 10828 | if (type->is_error()) |
b0e628fb | 10829 | return; |
10830 | Struct_type* struct_type = type->struct_type(); | |
c484d925 | 10831 | go_assert(struct_type != NULL); |
10832 | go_assert(struct_type->field(this->field_index_) != NULL); | |
e440a328 | 10833 | } |
10834 | ||
ea664253 | 10835 | // Get the backend representation for a field reference. |
e440a328 | 10836 | |
ea664253 | 10837 | Bexpression* |
10838 | Field_reference_expression::do_get_backend(Translate_context* context) | |
e440a328 | 10839 | { |
ea664253 | 10840 | Bexpression* bstruct = this->expr_->get_backend(context); |
10841 | return context->gogo()->backend()->struct_field_expression(bstruct, | |
10842 | this->field_index_, | |
10843 | this->location()); | |
e440a328 | 10844 | } |
10845 | ||
d751bb78 | 10846 | // Dump ast representation for a field reference expression. |
10847 | ||
10848 | void | |
10849 | Field_reference_expression::do_dump_expression( | |
10850 | Ast_dump_context* ast_dump_context) const | |
10851 | { | |
10852 | this->expr_->dump_expression(ast_dump_context); | |
10853 | ast_dump_context->ostream() << "." << this->field_index_; | |
10854 | } | |
10855 | ||
e440a328 | 10856 | // Make a reference to a qualified identifier in an expression. |
10857 | ||
10858 | Field_reference_expression* | |
10859 | Expression::make_field_reference(Expression* expr, unsigned int field_index, | |
b13c66cd | 10860 | Location location) |
e440a328 | 10861 | { |
10862 | return new Field_reference_expression(expr, field_index, location); | |
10863 | } | |
10864 | ||
10865 | // Class Interface_field_reference_expression. | |
10866 | ||
2387f644 | 10867 | // Return an expression for the pointer to the function to call. |
e440a328 | 10868 | |
2387f644 | 10869 | Expression* |
10870 | Interface_field_reference_expression::get_function() | |
e440a328 | 10871 | { |
2387f644 | 10872 | Expression* ref = this->expr_; |
10873 | Location loc = this->location(); | |
10874 | if (ref->type()->points_to() != NULL) | |
10875 | ref = Expression::make_unary(OPERATOR_MULT, ref, loc); | |
e440a328 | 10876 | |
2387f644 | 10877 | Expression* mtable = |
10878 | Expression::make_interface_info(ref, INTERFACE_INFO_METHODS, loc); | |
10879 | Struct_type* mtable_type = mtable->type()->points_to()->struct_type(); | |
e440a328 | 10880 | |
10881 | std::string name = Gogo::unpack_hidden_name(this->name_); | |
2387f644 | 10882 | unsigned int index; |
10883 | const Struct_field* field = mtable_type->find_local_field(name, &index); | |
10884 | go_assert(field != NULL); | |
10885 | mtable = Expression::make_unary(OPERATOR_MULT, mtable, loc); | |
10886 | return Expression::make_field_reference(mtable, index, loc); | |
e440a328 | 10887 | } |
10888 | ||
2387f644 | 10889 | // Return an expression for the first argument to pass to the interface |
e440a328 | 10890 | // function. |
10891 | ||
2387f644 | 10892 | Expression* |
10893 | Interface_field_reference_expression::get_underlying_object() | |
e440a328 | 10894 | { |
2387f644 | 10895 | Expression* expr = this->expr_; |
10896 | if (expr->type()->points_to() != NULL) | |
10897 | expr = Expression::make_unary(OPERATOR_MULT, expr, this->location()); | |
10898 | return Expression::make_interface_info(expr, INTERFACE_INFO_OBJECT, | |
10899 | this->location()); | |
e440a328 | 10900 | } |
10901 | ||
10902 | // Traversal. | |
10903 | ||
10904 | int | |
10905 | Interface_field_reference_expression::do_traverse(Traverse* traverse) | |
10906 | { | |
10907 | return Expression::traverse(&this->expr_, traverse); | |
10908 | } | |
10909 | ||
0afbb937 | 10910 | // Lower the expression. If this expression is not called, we need to |
10911 | // evaluate the expression twice when converting to the backend | |
10912 | // interface. So introduce a temporary variable if necessary. | |
10913 | ||
10914 | Expression* | |
9782d556 | 10915 | Interface_field_reference_expression::do_flatten(Gogo*, Named_object*, |
10916 | Statement_inserter* inserter) | |
0afbb937 | 10917 | { |
5bf8be8b | 10918 | if (this->expr_->is_error_expression() |
10919 | || this->expr_->type()->is_error_type()) | |
10920 | { | |
10921 | go_assert(saw_errors()); | |
10922 | return Expression::make_error(this->location()); | |
10923 | } | |
10924 | ||
2387f644 | 10925 | if (!this->expr_->is_variable()) |
0afbb937 | 10926 | { |
10927 | Temporary_statement* temp = | |
10928 | Statement::make_temporary(this->expr_->type(), NULL, this->location()); | |
10929 | inserter->insert(temp); | |
10930 | this->expr_ = Expression::make_set_and_use_temporary(temp, this->expr_, | |
10931 | this->location()); | |
10932 | } | |
10933 | return this; | |
10934 | } | |
10935 | ||
e440a328 | 10936 | // Return the type of an interface field reference. |
10937 | ||
10938 | Type* | |
10939 | Interface_field_reference_expression::do_type() | |
10940 | { | |
10941 | Type* expr_type = this->expr_->type(); | |
10942 | ||
10943 | Type* points_to = expr_type->points_to(); | |
10944 | if (points_to != NULL) | |
10945 | expr_type = points_to; | |
10946 | ||
10947 | Interface_type* interface_type = expr_type->interface_type(); | |
10948 | if (interface_type == NULL) | |
10949 | return Type::make_error_type(); | |
10950 | ||
10951 | const Typed_identifier* method = interface_type->find_method(this->name_); | |
10952 | if (method == NULL) | |
10953 | return Type::make_error_type(); | |
10954 | ||
10955 | return method->type(); | |
10956 | } | |
10957 | ||
10958 | // Determine types. | |
10959 | ||
10960 | void | |
10961 | Interface_field_reference_expression::do_determine_type(const Type_context*) | |
10962 | { | |
10963 | this->expr_->determine_type_no_context(); | |
10964 | } | |
10965 | ||
10966 | // Check the types for an interface field reference. | |
10967 | ||
10968 | void | |
10969 | Interface_field_reference_expression::do_check_types(Gogo*) | |
10970 | { | |
10971 | Type* type = this->expr_->type(); | |
10972 | ||
10973 | Type* points_to = type->points_to(); | |
10974 | if (points_to != NULL) | |
10975 | type = points_to; | |
10976 | ||
10977 | Interface_type* interface_type = type->interface_type(); | |
10978 | if (interface_type == NULL) | |
5c491127 | 10979 | { |
10980 | if (!type->is_error_type()) | |
10981 | this->report_error(_("expected interface or pointer to interface")); | |
10982 | } | |
e440a328 | 10983 | else |
10984 | { | |
10985 | const Typed_identifier* method = | |
10986 | interface_type->find_method(this->name_); | |
10987 | if (method == NULL) | |
10988 | { | |
10989 | error_at(this->location(), "method %qs not in interface", | |
10990 | Gogo::message_name(this->name_).c_str()); | |
10991 | this->set_is_error(); | |
10992 | } | |
10993 | } | |
10994 | } | |
10995 | ||
0afbb937 | 10996 | // If an interface field reference is not simply called, then it is |
10997 | // represented as a closure. The closure will hold a single variable, | |
10998 | // the value of the interface on which the method should be called. | |
10999 | // The function will be a simple thunk that pulls the value from the | |
11000 | // closure and calls the method with the remaining arguments. | |
11001 | ||
11002 | // Because method values are not common, we don't build all thunks for | |
11003 | // all possible interface methods, but instead only build them as we | |
11004 | // need them. In particular, we even build them on demand for | |
11005 | // interface methods defined in other packages. | |
11006 | ||
11007 | Interface_field_reference_expression::Interface_method_thunks | |
11008 | Interface_field_reference_expression::interface_method_thunks; | |
11009 | ||
11010 | // Find or create the thunk to call method NAME on TYPE. | |
11011 | ||
11012 | Named_object* | |
11013 | Interface_field_reference_expression::create_thunk(Gogo* gogo, | |
11014 | Interface_type* type, | |
11015 | const std::string& name) | |
11016 | { | |
11017 | std::pair<Interface_type*, Method_thunks*> val(type, NULL); | |
11018 | std::pair<Interface_method_thunks::iterator, bool> ins = | |
11019 | Interface_field_reference_expression::interface_method_thunks.insert(val); | |
11020 | if (ins.second) | |
11021 | { | |
11022 | // This is the first time we have seen this interface. | |
11023 | ins.first->second = new Method_thunks(); | |
11024 | } | |
11025 | ||
11026 | for (Method_thunks::const_iterator p = ins.first->second->begin(); | |
11027 | p != ins.first->second->end(); | |
11028 | p++) | |
11029 | if (p->first == name) | |
11030 | return p->second; | |
11031 | ||
11032 | Location loc = type->location(); | |
11033 | ||
11034 | const Typed_identifier* method_id = type->find_method(name); | |
11035 | if (method_id == NULL) | |
11036 | return Named_object::make_erroneous_name(Gogo::thunk_name()); | |
11037 | ||
11038 | Function_type* orig_fntype = method_id->type()->function_type(); | |
11039 | if (orig_fntype == NULL) | |
11040 | return Named_object::make_erroneous_name(Gogo::thunk_name()); | |
11041 | ||
11042 | Struct_field_list* sfl = new Struct_field_list(); | |
f8bdf81a | 11043 | // The type here is wrong--it should be the C function type. But it |
11044 | // doesn't really matter. | |
0afbb937 | 11045 | Type* vt = Type::make_pointer_type(Type::make_void_type()); |
11046 | sfl->push_back(Struct_field(Typed_identifier("fn.0", vt, loc))); | |
11047 | sfl->push_back(Struct_field(Typed_identifier("val.1", type, loc))); | |
11048 | Type* closure_type = Type::make_struct_type(sfl, loc); | |
11049 | closure_type = Type::make_pointer_type(closure_type); | |
11050 | ||
f8bdf81a | 11051 | Function_type* new_fntype = orig_fntype->copy_with_names(); |
0afbb937 | 11052 | |
da244e59 | 11053 | std::string thunk_name = Gogo::thunk_name(); |
11054 | Named_object* new_no = gogo->start_function(thunk_name, new_fntype, | |
0afbb937 | 11055 | false, loc); |
11056 | ||
f8bdf81a | 11057 | Variable* cvar = new Variable(closure_type, NULL, false, false, false, loc); |
11058 | cvar->set_is_used(); | |
1ecc6157 | 11059 | cvar->set_is_closure(); |
da244e59 | 11060 | Named_object* cp = Named_object::make_variable("$closure" + thunk_name, |
11061 | NULL, cvar); | |
f8bdf81a | 11062 | new_no->func_value()->set_closure_var(cp); |
0afbb937 | 11063 | |
f8bdf81a | 11064 | gogo->start_block(loc); |
0afbb937 | 11065 | |
11066 | // Field 0 of the closure is the function code pointer, field 1 is | |
11067 | // the value on which to invoke the method. | |
11068 | Expression* arg = Expression::make_var_reference(cp, loc); | |
11069 | arg = Expression::make_unary(OPERATOR_MULT, arg, loc); | |
11070 | arg = Expression::make_field_reference(arg, 1, loc); | |
11071 | ||
11072 | Expression *ifre = Expression::make_interface_field_reference(arg, name, | |
11073 | loc); | |
11074 | ||
11075 | const Typed_identifier_list* orig_params = orig_fntype->parameters(); | |
11076 | Expression_list* args; | |
11077 | if (orig_params == NULL || orig_params->empty()) | |
11078 | args = NULL; | |
11079 | else | |
11080 | { | |
11081 | const Typed_identifier_list* new_params = new_fntype->parameters(); | |
11082 | args = new Expression_list(); | |
11083 | for (Typed_identifier_list::const_iterator p = new_params->begin(); | |
f8bdf81a | 11084 | p != new_params->end(); |
0afbb937 | 11085 | ++p) |
11086 | { | |
11087 | Named_object* p_no = gogo->lookup(p->name(), NULL); | |
11088 | go_assert(p_no != NULL | |
11089 | && p_no->is_variable() | |
11090 | && p_no->var_value()->is_parameter()); | |
11091 | args->push_back(Expression::make_var_reference(p_no, loc)); | |
11092 | } | |
11093 | } | |
11094 | ||
11095 | Call_expression* call = Expression::make_call(ifre, args, | |
11096 | orig_fntype->is_varargs(), | |
11097 | loc); | |
11098 | call->set_varargs_are_lowered(); | |
11099 | ||
11100 | Statement* s = Statement::make_return_from_call(call, loc); | |
11101 | gogo->add_statement(s); | |
11102 | Block* b = gogo->finish_block(loc); | |
11103 | gogo->add_block(b, loc); | |
11104 | gogo->lower_block(new_no, b); | |
a32698ee | 11105 | gogo->flatten_block(new_no, b); |
0afbb937 | 11106 | gogo->finish_function(loc); |
11107 | ||
11108 | ins.first->second->push_back(std::make_pair(name, new_no)); | |
11109 | return new_no; | |
11110 | } | |
11111 | ||
ea664253 | 11112 | // Get the backend representation for a method value. |
e440a328 | 11113 | |
ea664253 | 11114 | Bexpression* |
11115 | Interface_field_reference_expression::do_get_backend(Translate_context* context) | |
e440a328 | 11116 | { |
0afbb937 | 11117 | Interface_type* type = this->expr_->type()->interface_type(); |
11118 | if (type == NULL) | |
11119 | { | |
11120 | go_assert(saw_errors()); | |
ea664253 | 11121 | return context->backend()->error_expression(); |
0afbb937 | 11122 | } |
11123 | ||
11124 | Named_object* thunk = | |
11125 | Interface_field_reference_expression::create_thunk(context->gogo(), | |
11126 | type, this->name_); | |
11127 | if (thunk->is_erroneous()) | |
11128 | { | |
11129 | go_assert(saw_errors()); | |
ea664253 | 11130 | return context->backend()->error_expression(); |
0afbb937 | 11131 | } |
11132 | ||
11133 | // FIXME: We should lower this earlier, but we can't it lower it in | |
11134 | // the lowering pass because at that point we don't know whether we | |
11135 | // need to create the thunk or not. If the expression is called, we | |
11136 | // don't need the thunk. | |
11137 | ||
11138 | Location loc = this->location(); | |
11139 | ||
11140 | Struct_field_list* fields = new Struct_field_list(); | |
11141 | fields->push_back(Struct_field(Typed_identifier("fn.0", | |
11142 | thunk->func_value()->type(), | |
11143 | loc))); | |
11144 | fields->push_back(Struct_field(Typed_identifier("val.1", | |
11145 | this->expr_->type(), | |
11146 | loc))); | |
11147 | Struct_type* st = Type::make_struct_type(fields, loc); | |
11148 | ||
11149 | Expression_list* vals = new Expression_list(); | |
11150 | vals->push_back(Expression::make_func_code_reference(thunk, loc)); | |
11151 | vals->push_back(this->expr_); | |
11152 | ||
11153 | Expression* expr = Expression::make_struct_composite_literal(st, vals, loc); | |
ea664253 | 11154 | Bexpression* bclosure = |
11155 | Expression::make_heap_expression(expr, loc)->get_backend(context); | |
0afbb937 | 11156 | |
2387f644 | 11157 | Expression* nil_check = |
11158 | Expression::make_binary(OPERATOR_EQEQ, this->expr_, | |
11159 | Expression::make_nil(loc), loc); | |
ea664253 | 11160 | Bexpression* bnil_check = nil_check->get_backend(context); |
0afbb937 | 11161 | |
2387f644 | 11162 | Gogo* gogo = context->gogo(); |
ea664253 | 11163 | Bexpression* bcrash = gogo->runtime_error(RUNTIME_ERROR_NIL_DEREFERENCE, |
11164 | loc)->get_backend(context); | |
2387f644 | 11165 | |
11166 | Bexpression* bcond = | |
a32698ee | 11167 | gogo->backend()->conditional_expression(NULL, bnil_check, bcrash, NULL, loc); |
2387f644 | 11168 | Bstatement* cond_statement = gogo->backend()->expression_statement(bcond); |
ea664253 | 11169 | return gogo->backend()->compound_expression(cond_statement, bclosure, loc); |
e440a328 | 11170 | } |
11171 | ||
d751bb78 | 11172 | // Dump ast representation for an interface field reference. |
11173 | ||
11174 | void | |
11175 | Interface_field_reference_expression::do_dump_expression( | |
11176 | Ast_dump_context* ast_dump_context) const | |
11177 | { | |
11178 | this->expr_->dump_expression(ast_dump_context); | |
11179 | ast_dump_context->ostream() << "." << this->name_; | |
11180 | } | |
11181 | ||
e440a328 | 11182 | // Make a reference to a field in an interface. |
11183 | ||
11184 | Expression* | |
11185 | Expression::make_interface_field_reference(Expression* expr, | |
11186 | const std::string& field, | |
b13c66cd | 11187 | Location location) |
e440a328 | 11188 | { |
11189 | return new Interface_field_reference_expression(expr, field, location); | |
11190 | } | |
11191 | ||
11192 | // A general selector. This is a Parser_expression for LEFT.NAME. It | |
11193 | // is lowered after we know the type of the left hand side. | |
11194 | ||
11195 | class Selector_expression : public Parser_expression | |
11196 | { | |
11197 | public: | |
11198 | Selector_expression(Expression* left, const std::string& name, | |
b13c66cd | 11199 | Location location) |
e440a328 | 11200 | : Parser_expression(EXPRESSION_SELECTOR, location), |
11201 | left_(left), name_(name) | |
11202 | { } | |
11203 | ||
11204 | protected: | |
11205 | int | |
11206 | do_traverse(Traverse* traverse) | |
11207 | { return Expression::traverse(&this->left_, traverse); } | |
11208 | ||
11209 | Expression* | |
ceeb4318 | 11210 | do_lower(Gogo*, Named_object*, Statement_inserter*, int); |
e440a328 | 11211 | |
11212 | Expression* | |
11213 | do_copy() | |
11214 | { | |
11215 | return new Selector_expression(this->left_->copy(), this->name_, | |
11216 | this->location()); | |
11217 | } | |
11218 | ||
d751bb78 | 11219 | void |
11220 | do_dump_expression(Ast_dump_context* ast_dump_context) const; | |
11221 | ||
e440a328 | 11222 | private: |
11223 | Expression* | |
11224 | lower_method_expression(Gogo*); | |
11225 | ||
11226 | // The expression on the left hand side. | |
11227 | Expression* left_; | |
11228 | // The name on the right hand side. | |
11229 | std::string name_; | |
11230 | }; | |
11231 | ||
11232 | // Lower a selector expression once we know the real type of the left | |
11233 | // hand side. | |
11234 | ||
11235 | Expression* | |
ceeb4318 | 11236 | Selector_expression::do_lower(Gogo* gogo, Named_object*, Statement_inserter*, |
11237 | int) | |
e440a328 | 11238 | { |
11239 | Expression* left = this->left_; | |
11240 | if (left->is_type_expression()) | |
11241 | return this->lower_method_expression(gogo); | |
11242 | return Type::bind_field_or_method(gogo, left->type(), left, this->name_, | |
11243 | this->location()); | |
11244 | } | |
11245 | ||
11246 | // Lower a method expression T.M or (*T).M. We turn this into a | |
11247 | // function literal. | |
11248 | ||
11249 | Expression* | |
11250 | Selector_expression::lower_method_expression(Gogo* gogo) | |
11251 | { | |
b13c66cd | 11252 | Location location = this->location(); |
e440a328 | 11253 | Type* type = this->left_->type(); |
11254 | const std::string& name(this->name_); | |
11255 | ||
11256 | bool is_pointer; | |
11257 | if (type->points_to() == NULL) | |
11258 | is_pointer = false; | |
11259 | else | |
11260 | { | |
11261 | is_pointer = true; | |
11262 | type = type->points_to(); | |
11263 | } | |
11264 | Named_type* nt = type->named_type(); | |
11265 | if (nt == NULL) | |
11266 | { | |
11267 | error_at(location, | |
11268 | ("method expression requires named type or " | |
11269 | "pointer to named type")); | |
11270 | return Expression::make_error(location); | |
11271 | } | |
11272 | ||
11273 | bool is_ambiguous; | |
11274 | Method* method = nt->method_function(name, &is_ambiguous); | |
ab1468c3 | 11275 | const Typed_identifier* imethod = NULL; |
dcc8506b | 11276 | if (method == NULL && !is_pointer) |
ab1468c3 | 11277 | { |
11278 | Interface_type* it = nt->interface_type(); | |
11279 | if (it != NULL) | |
11280 | imethod = it->find_method(name); | |
11281 | } | |
11282 | ||
11283 | if (method == NULL && imethod == NULL) | |
e440a328 | 11284 | { |
11285 | if (!is_ambiguous) | |
dcc8506b | 11286 | error_at(location, "type %<%s%s%> has no method %<%s%>", |
11287 | is_pointer ? "*" : "", | |
e440a328 | 11288 | nt->message_name().c_str(), |
11289 | Gogo::message_name(name).c_str()); | |
11290 | else | |
dcc8506b | 11291 | error_at(location, "method %<%s%s%> is ambiguous in type %<%s%>", |
e440a328 | 11292 | Gogo::message_name(name).c_str(), |
dcc8506b | 11293 | is_pointer ? "*" : "", |
e440a328 | 11294 | nt->message_name().c_str()); |
11295 | return Expression::make_error(location); | |
11296 | } | |
11297 | ||
ab1468c3 | 11298 | if (method != NULL && !is_pointer && !method->is_value_method()) |
e440a328 | 11299 | { |
11300 | error_at(location, "method requires pointer (use %<(*%s).%s)%>", | |
11301 | nt->message_name().c_str(), | |
11302 | Gogo::message_name(name).c_str()); | |
11303 | return Expression::make_error(location); | |
11304 | } | |
11305 | ||
11306 | // Build a new function type in which the receiver becomes the first | |
11307 | // argument. | |
ab1468c3 | 11308 | Function_type* method_type; |
11309 | if (method != NULL) | |
11310 | { | |
11311 | method_type = method->type(); | |
c484d925 | 11312 | go_assert(method_type->is_method()); |
ab1468c3 | 11313 | } |
11314 | else | |
11315 | { | |
11316 | method_type = imethod->type()->function_type(); | |
c484d925 | 11317 | go_assert(method_type != NULL && !method_type->is_method()); |
ab1468c3 | 11318 | } |
e440a328 | 11319 | |
11320 | const char* const receiver_name = "$this"; | |
11321 | Typed_identifier_list* parameters = new Typed_identifier_list(); | |
11322 | parameters->push_back(Typed_identifier(receiver_name, this->left_->type(), | |
11323 | location)); | |
11324 | ||
11325 | const Typed_identifier_list* method_parameters = method_type->parameters(); | |
11326 | if (method_parameters != NULL) | |
11327 | { | |
f470da59 | 11328 | int i = 0; |
e440a328 | 11329 | for (Typed_identifier_list::const_iterator p = method_parameters->begin(); |
11330 | p != method_parameters->end(); | |
f470da59 | 11331 | ++p, ++i) |
11332 | { | |
68883531 | 11333 | if (!p->name().empty()) |
f470da59 | 11334 | parameters->push_back(*p); |
11335 | else | |
11336 | { | |
11337 | char buf[20]; | |
11338 | snprintf(buf, sizeof buf, "$param%d", i); | |
11339 | parameters->push_back(Typed_identifier(buf, p->type(), | |
11340 | p->location())); | |
11341 | } | |
11342 | } | |
e440a328 | 11343 | } |
11344 | ||
11345 | const Typed_identifier_list* method_results = method_type->results(); | |
11346 | Typed_identifier_list* results; | |
11347 | if (method_results == NULL) | |
11348 | results = NULL; | |
11349 | else | |
11350 | { | |
11351 | results = new Typed_identifier_list(); | |
11352 | for (Typed_identifier_list::const_iterator p = method_results->begin(); | |
11353 | p != method_results->end(); | |
11354 | ++p) | |
11355 | results->push_back(*p); | |
11356 | } | |
11357 | ||
11358 | Function_type* fntype = Type::make_function_type(NULL, parameters, results, | |
11359 | location); | |
11360 | if (method_type->is_varargs()) | |
11361 | fntype->set_is_varargs(); | |
11362 | ||
11363 | // We generate methods which always takes a pointer to the receiver | |
11364 | // as their first argument. If this is for a pointer type, we can | |
11365 | // simply reuse the existing function. We use an internal hack to | |
11366 | // get the right type. | |
8381eda7 | 11367 | // FIXME: This optimization is disabled because it doesn't yet work |
11368 | // with function descriptors when the method expression is not | |
11369 | // directly called. | |
11370 | if (method != NULL && is_pointer && false) | |
e440a328 | 11371 | { |
11372 | Named_object* mno = (method->needs_stub_method() | |
11373 | ? method->stub_object() | |
11374 | : method->named_object()); | |
11375 | Expression* f = Expression::make_func_reference(mno, NULL, location); | |
11376 | f = Expression::make_cast(fntype, f, location); | |
11377 | Type_conversion_expression* tce = | |
11378 | static_cast<Type_conversion_expression*>(f); | |
11379 | tce->set_may_convert_function_types(); | |
11380 | return f; | |
11381 | } | |
11382 | ||
11383 | Named_object* no = gogo->start_function(Gogo::thunk_name(), fntype, false, | |
11384 | location); | |
11385 | ||
11386 | Named_object* vno = gogo->lookup(receiver_name, NULL); | |
c484d925 | 11387 | go_assert(vno != NULL); |
e440a328 | 11388 | Expression* ve = Expression::make_var_reference(vno, location); |
ab1468c3 | 11389 | Expression* bm; |
11390 | if (method != NULL) | |
11391 | bm = Type::bind_field_or_method(gogo, nt, ve, name, location); | |
11392 | else | |
11393 | bm = Expression::make_interface_field_reference(ve, name, location); | |
f690b0bb | 11394 | |
11395 | // Even though we found the method above, if it has an error type we | |
11396 | // may see an error here. | |
11397 | if (bm->is_error_expression()) | |
463fe805 | 11398 | { |
11399 | gogo->finish_function(location); | |
11400 | return bm; | |
11401 | } | |
e440a328 | 11402 | |
11403 | Expression_list* args; | |
f470da59 | 11404 | if (parameters->size() <= 1) |
e440a328 | 11405 | args = NULL; |
11406 | else | |
11407 | { | |
11408 | args = new Expression_list(); | |
f470da59 | 11409 | Typed_identifier_list::const_iterator p = parameters->begin(); |
11410 | ++p; | |
11411 | for (; p != parameters->end(); ++p) | |
e440a328 | 11412 | { |
11413 | vno = gogo->lookup(p->name(), NULL); | |
c484d925 | 11414 | go_assert(vno != NULL); |
e440a328 | 11415 | args->push_back(Expression::make_var_reference(vno, location)); |
11416 | } | |
11417 | } | |
11418 | ||
ceeb4318 | 11419 | gogo->start_block(location); |
11420 | ||
e440a328 | 11421 | Call_expression* call = Expression::make_call(bm, args, |
11422 | method_type->is_varargs(), | |
11423 | location); | |
11424 | ||
0afbb937 | 11425 | Statement* s = Statement::make_return_from_call(call, location); |
e440a328 | 11426 | gogo->add_statement(s); |
11427 | ||
ceeb4318 | 11428 | Block* b = gogo->finish_block(location); |
11429 | ||
11430 | gogo->add_block(b, location); | |
11431 | ||
11432 | // Lower the call in case there are multiple results. | |
11433 | gogo->lower_block(no, b); | |
a32698ee | 11434 | gogo->flatten_block(no, b); |
ceeb4318 | 11435 | |
e440a328 | 11436 | gogo->finish_function(location); |
11437 | ||
11438 | return Expression::make_func_reference(no, NULL, location); | |
11439 | } | |
11440 | ||
d751bb78 | 11441 | // Dump the ast for a selector expression. |
11442 | ||
11443 | void | |
11444 | Selector_expression::do_dump_expression(Ast_dump_context* ast_dump_context) | |
11445 | const | |
11446 | { | |
11447 | ast_dump_context->dump_expression(this->left_); | |
11448 | ast_dump_context->ostream() << "."; | |
11449 | ast_dump_context->ostream() << this->name_; | |
11450 | } | |
11451 | ||
e440a328 | 11452 | // Make a selector expression. |
11453 | ||
11454 | Expression* | |
11455 | Expression::make_selector(Expression* left, const std::string& name, | |
b13c66cd | 11456 | Location location) |
e440a328 | 11457 | { |
11458 | return new Selector_expression(left, name, location); | |
11459 | } | |
11460 | ||
da244e59 | 11461 | // Class Allocation_expression. |
e440a328 | 11462 | |
da244e59 | 11463 | int |
11464 | Allocation_expression::do_traverse(Traverse* traverse) | |
e440a328 | 11465 | { |
da244e59 | 11466 | return Type::traverse(this->type_, traverse); |
11467 | } | |
e440a328 | 11468 | |
da244e59 | 11469 | Type* |
11470 | Allocation_expression::do_type() | |
11471 | { | |
11472 | return Type::make_pointer_type(this->type_); | |
11473 | } | |
e440a328 | 11474 | |
da244e59 | 11475 | // Make a copy of an allocation expression. |
e440a328 | 11476 | |
da244e59 | 11477 | Expression* |
11478 | Allocation_expression::do_copy() | |
11479 | { | |
11480 | Allocation_expression* alloc = | |
11481 | new Allocation_expression(this->type_, this->location()); | |
11482 | if (this->allocate_on_stack_) | |
11483 | alloc->set_allocate_on_stack(); | |
11484 | return alloc; | |
11485 | } | |
e440a328 | 11486 | |
ea664253 | 11487 | // Return the backend representation for an allocation expression. |
e440a328 | 11488 | |
ea664253 | 11489 | Bexpression* |
11490 | Allocation_expression::do_get_backend(Translate_context* context) | |
e440a328 | 11491 | { |
2c809f8f | 11492 | Gogo* gogo = context->gogo(); |
11493 | Location loc = this->location(); | |
da244e59 | 11494 | |
d5d1c295 | 11495 | Btype* btype = this->type_->get_backend(gogo); |
11496 | if (this->allocate_on_stack_) | |
da244e59 | 11497 | { |
d5d1c295 | 11498 | int64_t size = gogo->backend()->type_size(btype); |
11499 | return gogo->backend()->stack_allocation_expression(size, loc); | |
da244e59 | 11500 | } |
11501 | ||
ea664253 | 11502 | Bexpression* space = |
11503 | gogo->allocate_memory(this->type_, loc)->get_backend(context); | |
d5d1c295 | 11504 | Btype* pbtype = gogo->backend()->pointer_type(btype); |
ea664253 | 11505 | return gogo->backend()->convert_expression(pbtype, space, loc); |
e440a328 | 11506 | } |
11507 | ||
d751bb78 | 11508 | // Dump ast representation for an allocation expression. |
11509 | ||
11510 | void | |
11511 | Allocation_expression::do_dump_expression(Ast_dump_context* ast_dump_context) | |
11512 | const | |
11513 | { | |
11514 | ast_dump_context->ostream() << "new("; | |
11515 | ast_dump_context->dump_type(this->type_); | |
11516 | ast_dump_context->ostream() << ")"; | |
11517 | } | |
11518 | ||
e440a328 | 11519 | // Make an allocation expression. |
11520 | ||
11521 | Expression* | |
b13c66cd | 11522 | Expression::make_allocation(Type* type, Location location) |
e440a328 | 11523 | { |
11524 | return new Allocation_expression(type, location); | |
11525 | } | |
11526 | ||
da244e59 | 11527 | // Class Struct_construction_expression. |
e440a328 | 11528 | |
11529 | // Traversal. | |
11530 | ||
11531 | int | |
11532 | Struct_construction_expression::do_traverse(Traverse* traverse) | |
11533 | { | |
0c4f5a19 | 11534 | if (this->vals_ != NULL) |
11535 | { | |
11536 | if (this->traverse_order_ == NULL) | |
11537 | { | |
11538 | if (this->vals_->traverse(traverse) == TRAVERSE_EXIT) | |
11539 | return TRAVERSE_EXIT; | |
11540 | } | |
11541 | else | |
11542 | { | |
11543 | for (std::vector<int>::const_iterator p = | |
11544 | this->traverse_order_->begin(); | |
11545 | p != this->traverse_order_->end(); | |
11546 | ++p) | |
11547 | { | |
11548 | if (Expression::traverse(&this->vals_->at(*p), traverse) | |
11549 | == TRAVERSE_EXIT) | |
11550 | return TRAVERSE_EXIT; | |
11551 | } | |
11552 | } | |
11553 | } | |
e440a328 | 11554 | if (Type::traverse(this->type_, traverse) == TRAVERSE_EXIT) |
11555 | return TRAVERSE_EXIT; | |
11556 | return TRAVERSE_CONTINUE; | |
11557 | } | |
11558 | ||
11559 | // Return whether this is a constant initializer. | |
11560 | ||
11561 | bool | |
11562 | Struct_construction_expression::is_constant_struct() const | |
11563 | { | |
11564 | if (this->vals_ == NULL) | |
11565 | return true; | |
11566 | for (Expression_list::const_iterator pv = this->vals_->begin(); | |
11567 | pv != this->vals_->end(); | |
11568 | ++pv) | |
11569 | { | |
11570 | if (*pv != NULL | |
11571 | && !(*pv)->is_constant() | |
11572 | && (!(*pv)->is_composite_literal() | |
11573 | || (*pv)->is_nonconstant_composite_literal())) | |
11574 | return false; | |
11575 | } | |
11576 | ||
11577 | const Struct_field_list* fields = this->type_->struct_type()->fields(); | |
11578 | for (Struct_field_list::const_iterator pf = fields->begin(); | |
11579 | pf != fields->end(); | |
11580 | ++pf) | |
11581 | { | |
11582 | // There are no constant constructors for interfaces. | |
11583 | if (pf->type()->interface_type() != NULL) | |
11584 | return false; | |
11585 | } | |
11586 | ||
11587 | return true; | |
11588 | } | |
11589 | ||
f9ca30f9 | 11590 | // Return whether this struct is immutable. |
11591 | ||
11592 | bool | |
11593 | Struct_construction_expression::do_is_immutable() const | |
11594 | { | |
11595 | if (this->vals_ == NULL) | |
11596 | return true; | |
11597 | for (Expression_list::const_iterator pv = this->vals_->begin(); | |
11598 | pv != this->vals_->end(); | |
11599 | ++pv) | |
11600 | { | |
11601 | if (*pv != NULL && !(*pv)->is_immutable()) | |
11602 | return false; | |
11603 | } | |
11604 | return true; | |
11605 | } | |
11606 | ||
e440a328 | 11607 | // Final type determination. |
11608 | ||
11609 | void | |
11610 | Struct_construction_expression::do_determine_type(const Type_context*) | |
11611 | { | |
11612 | if (this->vals_ == NULL) | |
11613 | return; | |
11614 | const Struct_field_list* fields = this->type_->struct_type()->fields(); | |
11615 | Expression_list::const_iterator pv = this->vals_->begin(); | |
11616 | for (Struct_field_list::const_iterator pf = fields->begin(); | |
11617 | pf != fields->end(); | |
11618 | ++pf, ++pv) | |
11619 | { | |
11620 | if (pv == this->vals_->end()) | |
11621 | return; | |
11622 | if (*pv != NULL) | |
11623 | { | |
11624 | Type_context subcontext(pf->type(), false); | |
11625 | (*pv)->determine_type(&subcontext); | |
11626 | } | |
11627 | } | |
a6cb4c0e | 11628 | // Extra values are an error we will report elsewhere; we still want |
11629 | // to determine the type to avoid knockon errors. | |
11630 | for (; pv != this->vals_->end(); ++pv) | |
11631 | (*pv)->determine_type_no_context(); | |
e440a328 | 11632 | } |
11633 | ||
11634 | // Check types. | |
11635 | ||
11636 | void | |
11637 | Struct_construction_expression::do_check_types(Gogo*) | |
11638 | { | |
11639 | if (this->vals_ == NULL) | |
11640 | return; | |
11641 | ||
11642 | Struct_type* st = this->type_->struct_type(); | |
11643 | if (this->vals_->size() > st->field_count()) | |
11644 | { | |
11645 | this->report_error(_("too many expressions for struct")); | |
11646 | return; | |
11647 | } | |
11648 | ||
11649 | const Struct_field_list* fields = st->fields(); | |
11650 | Expression_list::const_iterator pv = this->vals_->begin(); | |
11651 | int i = 0; | |
11652 | for (Struct_field_list::const_iterator pf = fields->begin(); | |
11653 | pf != fields->end(); | |
11654 | ++pf, ++pv, ++i) | |
11655 | { | |
11656 | if (pv == this->vals_->end()) | |
11657 | { | |
11658 | this->report_error(_("too few expressions for struct")); | |
11659 | break; | |
11660 | } | |
11661 | ||
11662 | if (*pv == NULL) | |
11663 | continue; | |
11664 | ||
11665 | std::string reason; | |
11666 | if (!Type::are_assignable(pf->type(), (*pv)->type(), &reason)) | |
11667 | { | |
11668 | if (reason.empty()) | |
11669 | error_at((*pv)->location(), | |
11670 | "incompatible type for field %d in struct construction", | |
11671 | i + 1); | |
11672 | else | |
11673 | error_at((*pv)->location(), | |
11674 | ("incompatible type for field %d in " | |
11675 | "struct construction (%s)"), | |
11676 | i + 1, reason.c_str()); | |
11677 | this->set_is_error(); | |
11678 | } | |
11679 | } | |
c484d925 | 11680 | go_assert(pv == this->vals_->end()); |
e440a328 | 11681 | } |
11682 | ||
8ba8cc87 | 11683 | // Flatten a struct construction expression. Store the values into |
11684 | // temporaries in case they need interface conversion. | |
11685 | ||
11686 | Expression* | |
11687 | Struct_construction_expression::do_flatten(Gogo*, Named_object*, | |
11688 | Statement_inserter* inserter) | |
11689 | { | |
11690 | if (this->vals_ == NULL) | |
11691 | return this; | |
11692 | ||
11693 | // If this is a constant struct, we don't need temporaries. | |
11694 | if (this->is_constant_struct()) | |
11695 | return this; | |
11696 | ||
11697 | Location loc = this->location(); | |
11698 | for (Expression_list::iterator pv = this->vals_->begin(); | |
11699 | pv != this->vals_->end(); | |
11700 | ++pv) | |
11701 | { | |
11702 | if (*pv != NULL) | |
11703 | { | |
5bf8be8b | 11704 | if ((*pv)->is_error_expression() || (*pv)->type()->is_error_type()) |
11705 | { | |
11706 | go_assert(saw_errors()); | |
11707 | return Expression::make_error(loc); | |
11708 | } | |
8ba8cc87 | 11709 | if (!(*pv)->is_variable()) |
11710 | { | |
11711 | Temporary_statement* temp = | |
11712 | Statement::make_temporary(NULL, *pv, loc); | |
11713 | inserter->insert(temp); | |
11714 | *pv = Expression::make_temporary_reference(temp, loc); | |
11715 | } | |
11716 | } | |
11717 | } | |
11718 | return this; | |
11719 | } | |
11720 | ||
ea664253 | 11721 | // Return the backend representation for constructing a struct. |
e440a328 | 11722 | |
ea664253 | 11723 | Bexpression* |
11724 | Struct_construction_expression::do_get_backend(Translate_context* context) | |
e440a328 | 11725 | { |
11726 | Gogo* gogo = context->gogo(); | |
11727 | ||
2c809f8f | 11728 | Btype* btype = this->type_->get_backend(gogo); |
e440a328 | 11729 | if (this->vals_ == NULL) |
ea664253 | 11730 | return gogo->backend()->zero_expression(btype); |
e440a328 | 11731 | |
e440a328 | 11732 | const Struct_field_list* fields = this->type_->struct_type()->fields(); |
e440a328 | 11733 | Expression_list::const_iterator pv = this->vals_->begin(); |
2c809f8f | 11734 | std::vector<Bexpression*> init; |
11735 | for (Struct_field_list::const_iterator pf = fields->begin(); | |
11736 | pf != fields->end(); | |
11737 | ++pf) | |
e440a328 | 11738 | { |
63697958 | 11739 | Btype* fbtype = pf->type()->get_backend(gogo); |
e440a328 | 11740 | if (pv == this->vals_->end()) |
2c809f8f | 11741 | init.push_back(gogo->backend()->zero_expression(fbtype)); |
e440a328 | 11742 | else if (*pv == NULL) |
11743 | { | |
2c809f8f | 11744 | init.push_back(gogo->backend()->zero_expression(fbtype)); |
e440a328 | 11745 | ++pv; |
11746 | } | |
11747 | else | |
11748 | { | |
2c809f8f | 11749 | Expression* val = |
11750 | Expression::convert_for_assignment(gogo, pf->type(), | |
11751 | *pv, this->location()); | |
ea664253 | 11752 | init.push_back(val->get_backend(context)); |
e440a328 | 11753 | ++pv; |
11754 | } | |
e440a328 | 11755 | } |
ea664253 | 11756 | return gogo->backend()->constructor_expression(btype, init, this->location()); |
e440a328 | 11757 | } |
11758 | ||
11759 | // Export a struct construction. | |
11760 | ||
11761 | void | |
11762 | Struct_construction_expression::do_export(Export* exp) const | |
11763 | { | |
11764 | exp->write_c_string("convert("); | |
11765 | exp->write_type(this->type_); | |
11766 | for (Expression_list::const_iterator pv = this->vals_->begin(); | |
11767 | pv != this->vals_->end(); | |
11768 | ++pv) | |
11769 | { | |
11770 | exp->write_c_string(", "); | |
11771 | if (*pv != NULL) | |
11772 | (*pv)->export_expression(exp); | |
11773 | } | |
11774 | exp->write_c_string(")"); | |
11775 | } | |
11776 | ||
d751bb78 | 11777 | // Dump ast representation of a struct construction expression. |
11778 | ||
11779 | void | |
11780 | Struct_construction_expression::do_dump_expression( | |
11781 | Ast_dump_context* ast_dump_context) const | |
11782 | { | |
d751bb78 | 11783 | ast_dump_context->dump_type(this->type_); |
11784 | ast_dump_context->ostream() << "{"; | |
11785 | ast_dump_context->dump_expression_list(this->vals_); | |
11786 | ast_dump_context->ostream() << "}"; | |
11787 | } | |
11788 | ||
e440a328 | 11789 | // Make a struct composite literal. This used by the thunk code. |
11790 | ||
11791 | Expression* | |
11792 | Expression::make_struct_composite_literal(Type* type, Expression_list* vals, | |
b13c66cd | 11793 | Location location) |
e440a328 | 11794 | { |
c484d925 | 11795 | go_assert(type->struct_type() != NULL); |
e440a328 | 11796 | return new Struct_construction_expression(type, vals, location); |
11797 | } | |
11798 | ||
da244e59 | 11799 | // Class Array_construction_expression. |
e440a328 | 11800 | |
11801 | // Traversal. | |
11802 | ||
11803 | int | |
11804 | Array_construction_expression::do_traverse(Traverse* traverse) | |
11805 | { | |
11806 | if (this->vals_ != NULL | |
11807 | && this->vals_->traverse(traverse) == TRAVERSE_EXIT) | |
11808 | return TRAVERSE_EXIT; | |
11809 | if (Type::traverse(this->type_, traverse) == TRAVERSE_EXIT) | |
11810 | return TRAVERSE_EXIT; | |
11811 | return TRAVERSE_CONTINUE; | |
11812 | } | |
11813 | ||
11814 | // Return whether this is a constant initializer. | |
11815 | ||
11816 | bool | |
11817 | Array_construction_expression::is_constant_array() const | |
11818 | { | |
11819 | if (this->vals_ == NULL) | |
11820 | return true; | |
11821 | ||
11822 | // There are no constant constructors for interfaces. | |
11823 | if (this->type_->array_type()->element_type()->interface_type() != NULL) | |
11824 | return false; | |
11825 | ||
11826 | for (Expression_list::const_iterator pv = this->vals_->begin(); | |
11827 | pv != this->vals_->end(); | |
11828 | ++pv) | |
11829 | { | |
11830 | if (*pv != NULL | |
11831 | && !(*pv)->is_constant() | |
11832 | && (!(*pv)->is_composite_literal() | |
11833 | || (*pv)->is_nonconstant_composite_literal())) | |
11834 | return false; | |
11835 | } | |
11836 | return true; | |
11837 | } | |
11838 | ||
f9ca30f9 | 11839 | // Return whether this is an immutable array initializer. |
11840 | ||
11841 | bool | |
11842 | Array_construction_expression::do_is_immutable() const | |
11843 | { | |
11844 | if (this->vals_ == NULL) | |
11845 | return true; | |
11846 | for (Expression_list::const_iterator pv = this->vals_->begin(); | |
11847 | pv != this->vals_->end(); | |
11848 | ++pv) | |
11849 | { | |
11850 | if (*pv != NULL && !(*pv)->is_immutable()) | |
11851 | return false; | |
11852 | } | |
11853 | return true; | |
11854 | } | |
11855 | ||
e440a328 | 11856 | // Final type determination. |
11857 | ||
11858 | void | |
11859 | Array_construction_expression::do_determine_type(const Type_context*) | |
11860 | { | |
11861 | if (this->vals_ == NULL) | |
11862 | return; | |
11863 | Type_context subcontext(this->type_->array_type()->element_type(), false); | |
11864 | for (Expression_list::const_iterator pv = this->vals_->begin(); | |
11865 | pv != this->vals_->end(); | |
11866 | ++pv) | |
11867 | { | |
11868 | if (*pv != NULL) | |
11869 | (*pv)->determine_type(&subcontext); | |
11870 | } | |
11871 | } | |
11872 | ||
11873 | // Check types. | |
11874 | ||
11875 | void | |
11876 | Array_construction_expression::do_check_types(Gogo*) | |
11877 | { | |
11878 | if (this->vals_ == NULL) | |
11879 | return; | |
11880 | ||
11881 | Array_type* at = this->type_->array_type(); | |
11882 | int i = 0; | |
11883 | Type* element_type = at->element_type(); | |
11884 | for (Expression_list::const_iterator pv = this->vals_->begin(); | |
11885 | pv != this->vals_->end(); | |
11886 | ++pv, ++i) | |
11887 | { | |
11888 | if (*pv != NULL | |
11889 | && !Type::are_assignable(element_type, (*pv)->type(), NULL)) | |
11890 | { | |
11891 | error_at((*pv)->location(), | |
11892 | "incompatible type for element %d in composite literal", | |
11893 | i + 1); | |
11894 | this->set_is_error(); | |
11895 | } | |
11896 | } | |
e440a328 | 11897 | } |
11898 | ||
8ba8cc87 | 11899 | // Flatten an array construction expression. Store the values into |
11900 | // temporaries in case they need interface conversion. | |
11901 | ||
11902 | Expression* | |
11903 | Array_construction_expression::do_flatten(Gogo*, Named_object*, | |
11904 | Statement_inserter* inserter) | |
11905 | { | |
11906 | if (this->vals_ == NULL) | |
11907 | return this; | |
11908 | ||
11909 | // If this is a constant array, we don't need temporaries. | |
11910 | if (this->is_constant_array()) | |
11911 | return this; | |
11912 | ||
11913 | Location loc = this->location(); | |
11914 | for (Expression_list::iterator pv = this->vals_->begin(); | |
11915 | pv != this->vals_->end(); | |
11916 | ++pv) | |
11917 | { | |
11918 | if (*pv != NULL) | |
11919 | { | |
5bf8be8b | 11920 | if ((*pv)->is_error_expression() || (*pv)->type()->is_error_type()) |
11921 | { | |
11922 | go_assert(saw_errors()); | |
11923 | return Expression::make_error(loc); | |
11924 | } | |
8ba8cc87 | 11925 | if (!(*pv)->is_variable()) |
11926 | { | |
11927 | Temporary_statement* temp = | |
11928 | Statement::make_temporary(NULL, *pv, loc); | |
11929 | inserter->insert(temp); | |
11930 | *pv = Expression::make_temporary_reference(temp, loc); | |
11931 | } | |
11932 | } | |
11933 | } | |
11934 | return this; | |
11935 | } | |
11936 | ||
2c809f8f | 11937 | // Get a constructor expression for the array values. |
e440a328 | 11938 | |
2c809f8f | 11939 | Bexpression* |
11940 | Array_construction_expression::get_constructor(Translate_context* context, | |
11941 | Btype* array_btype) | |
e440a328 | 11942 | { |
e440a328 | 11943 | Type* element_type = this->type_->array_type()->element_type(); |
2c809f8f | 11944 | |
11945 | std::vector<unsigned long> indexes; | |
11946 | std::vector<Bexpression*> vals; | |
11947 | Gogo* gogo = context->gogo(); | |
e440a328 | 11948 | if (this->vals_ != NULL) |
11949 | { | |
11950 | size_t i = 0; | |
ffe743ca | 11951 | std::vector<unsigned long>::const_iterator pi; |
11952 | if (this->indexes_ != NULL) | |
11953 | pi = this->indexes_->begin(); | |
e440a328 | 11954 | for (Expression_list::const_iterator pv = this->vals_->begin(); |
11955 | pv != this->vals_->end(); | |
11956 | ++pv, ++i) | |
11957 | { | |
ffe743ca | 11958 | if (this->indexes_ != NULL) |
11959 | go_assert(pi != this->indexes_->end()); | |
ffe743ca | 11960 | |
11961 | if (this->indexes_ == NULL) | |
2c809f8f | 11962 | indexes.push_back(i); |
ffe743ca | 11963 | else |
2c809f8f | 11964 | indexes.push_back(*pi); |
e440a328 | 11965 | if (*pv == NULL) |
63697958 | 11966 | { |
63697958 | 11967 | Btype* ebtype = element_type->get_backend(gogo); |
11968 | Bexpression *zv = gogo->backend()->zero_expression(ebtype); | |
2c809f8f | 11969 | vals.push_back(zv); |
63697958 | 11970 | } |
e440a328 | 11971 | else |
11972 | { | |
2c809f8f | 11973 | Expression* val_expr = |
11974 | Expression::convert_for_assignment(gogo, element_type, *pv, | |
11975 | this->location()); | |
ea664253 | 11976 | vals.push_back(val_expr->get_backend(context)); |
e440a328 | 11977 | } |
ffe743ca | 11978 | if (this->indexes_ != NULL) |
11979 | ++pi; | |
e440a328 | 11980 | } |
ffe743ca | 11981 | if (this->indexes_ != NULL) |
11982 | go_assert(pi == this->indexes_->end()); | |
e440a328 | 11983 | } |
2c809f8f | 11984 | return gogo->backend()->array_constructor_expression(array_btype, indexes, |
11985 | vals, this->location()); | |
e440a328 | 11986 | } |
11987 | ||
11988 | // Export an array construction. | |
11989 | ||
11990 | void | |
11991 | Array_construction_expression::do_export(Export* exp) const | |
11992 | { | |
11993 | exp->write_c_string("convert("); | |
11994 | exp->write_type(this->type_); | |
11995 | if (this->vals_ != NULL) | |
11996 | { | |
ffe743ca | 11997 | std::vector<unsigned long>::const_iterator pi; |
11998 | if (this->indexes_ != NULL) | |
11999 | pi = this->indexes_->begin(); | |
e440a328 | 12000 | for (Expression_list::const_iterator pv = this->vals_->begin(); |
12001 | pv != this->vals_->end(); | |
12002 | ++pv) | |
12003 | { | |
12004 | exp->write_c_string(", "); | |
ffe743ca | 12005 | |
12006 | if (this->indexes_ != NULL) | |
12007 | { | |
12008 | char buf[100]; | |
12009 | snprintf(buf, sizeof buf, "%lu", *pi); | |
12010 | exp->write_c_string(buf); | |
12011 | exp->write_c_string(":"); | |
12012 | } | |
12013 | ||
e440a328 | 12014 | if (*pv != NULL) |
12015 | (*pv)->export_expression(exp); | |
ffe743ca | 12016 | |
12017 | if (this->indexes_ != NULL) | |
12018 | ++pi; | |
e440a328 | 12019 | } |
12020 | } | |
12021 | exp->write_c_string(")"); | |
12022 | } | |
12023 | ||
d751bb78 | 12024 | // Dump ast representation of an array construction expressin. |
12025 | ||
12026 | void | |
12027 | Array_construction_expression::do_dump_expression( | |
12028 | Ast_dump_context* ast_dump_context) const | |
12029 | { | |
ffe743ca | 12030 | Expression* length = this->type_->array_type()->length(); |
8b1c301d | 12031 | |
12032 | ast_dump_context->ostream() << "[" ; | |
12033 | if (length != NULL) | |
12034 | { | |
12035 | ast_dump_context->dump_expression(length); | |
12036 | } | |
12037 | ast_dump_context->ostream() << "]" ; | |
d751bb78 | 12038 | ast_dump_context->dump_type(this->type_); |
12039 | ast_dump_context->ostream() << "{" ; | |
ffe743ca | 12040 | if (this->indexes_ == NULL) |
12041 | ast_dump_context->dump_expression_list(this->vals_); | |
12042 | else | |
12043 | { | |
12044 | Expression_list::const_iterator pv = this->vals_->begin(); | |
12045 | for (std::vector<unsigned long>::const_iterator pi = | |
12046 | this->indexes_->begin(); | |
12047 | pi != this->indexes_->end(); | |
12048 | ++pi, ++pv) | |
12049 | { | |
12050 | if (pi != this->indexes_->begin()) | |
12051 | ast_dump_context->ostream() << ", "; | |
12052 | ast_dump_context->ostream() << *pi << ':'; | |
12053 | ast_dump_context->dump_expression(*pv); | |
12054 | } | |
12055 | } | |
d751bb78 | 12056 | ast_dump_context->ostream() << "}" ; |
12057 | ||
12058 | } | |
12059 | ||
da244e59 | 12060 | // Class Fixed_array_construction_expression. |
e440a328 | 12061 | |
da244e59 | 12062 | Fixed_array_construction_expression::Fixed_array_construction_expression( |
12063 | Type* type, const std::vector<unsigned long>* indexes, | |
12064 | Expression_list* vals, Location location) | |
12065 | : Array_construction_expression(EXPRESSION_FIXED_ARRAY_CONSTRUCTION, | |
12066 | type, indexes, vals, location) | |
12067 | { go_assert(type->array_type() != NULL && !type->is_slice_type()); } | |
e440a328 | 12068 | |
ea664253 | 12069 | // Return the backend representation for constructing a fixed array. |
e440a328 | 12070 | |
ea664253 | 12071 | Bexpression* |
12072 | Fixed_array_construction_expression::do_get_backend(Translate_context* context) | |
e440a328 | 12073 | { |
9f0e0513 | 12074 | Type* type = this->type(); |
12075 | Btype* btype = type->get_backend(context->gogo()); | |
ea664253 | 12076 | return this->get_constructor(context, btype); |
e440a328 | 12077 | } |
12078 | ||
76f85fd6 | 12079 | Expression* |
12080 | Expression::make_array_composite_literal(Type* type, Expression_list* vals, | |
12081 | Location location) | |
12082 | { | |
12083 | go_assert(type->array_type() != NULL && !type->is_slice_type()); | |
12084 | return new Fixed_array_construction_expression(type, NULL, vals, location); | |
12085 | } | |
12086 | ||
da244e59 | 12087 | // Class Slice_construction_expression. |
e440a328 | 12088 | |
da244e59 | 12089 | Slice_construction_expression::Slice_construction_expression( |
12090 | Type* type, const std::vector<unsigned long>* indexes, | |
12091 | Expression_list* vals, Location location) | |
12092 | : Array_construction_expression(EXPRESSION_SLICE_CONSTRUCTION, | |
12093 | type, indexes, vals, location), | |
12094 | valtype_(NULL) | |
e440a328 | 12095 | { |
da244e59 | 12096 | go_assert(type->is_slice_type()); |
23d77f91 | 12097 | |
da244e59 | 12098 | unsigned long lenval; |
12099 | Expression* length; | |
12100 | if (vals == NULL || vals->empty()) | |
12101 | lenval = 0; | |
12102 | else | |
12103 | { | |
12104 | if (this->indexes() == NULL) | |
12105 | lenval = vals->size(); | |
12106 | else | |
12107 | lenval = indexes->back() + 1; | |
12108 | } | |
12109 | Type* int_type = Type::lookup_integer_type("int"); | |
12110 | length = Expression::make_integer_ul(lenval, int_type, location); | |
12111 | Type* element_type = type->array_type()->element_type(); | |
12112 | this->valtype_ = Type::make_array_type(element_type, length); | |
12113 | } | |
e440a328 | 12114 | |
e440a328 | 12115 | |
23d77f91 | 12116 | // Traversal. |
12117 | ||
12118 | int | |
12119 | Slice_construction_expression::do_traverse(Traverse* traverse) | |
12120 | { | |
12121 | if (this->Array_construction_expression::do_traverse(traverse) | |
12122 | == TRAVERSE_EXIT) | |
12123 | return TRAVERSE_EXIT; | |
12124 | if (Type::traverse(this->valtype_, traverse) == TRAVERSE_EXIT) | |
12125 | return TRAVERSE_EXIT; | |
12126 | return TRAVERSE_CONTINUE; | |
12127 | } | |
12128 | ||
ea664253 | 12129 | // Return the backend representation for constructing a slice. |
e440a328 | 12130 | |
ea664253 | 12131 | Bexpression* |
12132 | Slice_construction_expression::do_get_backend(Translate_context* context) | |
e440a328 | 12133 | { |
f9c68f17 | 12134 | Array_type* array_type = this->type()->array_type(); |
12135 | if (array_type == NULL) | |
12136 | { | |
c484d925 | 12137 | go_assert(this->type()->is_error()); |
ea664253 | 12138 | return context->backend()->error_expression(); |
f9c68f17 | 12139 | } |
12140 | ||
f23d7786 | 12141 | Location loc = this->location(); |
f9c68f17 | 12142 | Type* element_type = array_type->element_type(); |
23d77f91 | 12143 | go_assert(this->valtype_ != NULL); |
3d60812e | 12144 | |
f23d7786 | 12145 | Expression_list* vals = this->vals(); |
e440a328 | 12146 | if (this->vals() == NULL || this->vals()->empty()) |
12147 | { | |
f23d7786 | 12148 | // We need to create a unique value for the empty array literal. |
12149 | vals = new Expression_list; | |
12150 | vals->push_back(NULL); | |
e440a328 | 12151 | } |
f23d7786 | 12152 | Expression* array_val = |
12153 | new Fixed_array_construction_expression(this->valtype_, this->indexes(), | |
12154 | vals, loc); | |
e440a328 | 12155 | |
f23d7786 | 12156 | bool is_constant_initializer = array_val->is_immutable(); |
d8829beb | 12157 | |
12158 | // We have to copy the initial values into heap memory if we are in | |
12159 | // a function or if the values are not constants. We also have to | |
12160 | // copy them if they may contain pointers in a non-constant context, | |
12161 | // as otherwise the garbage collector won't see them. | |
12162 | bool copy_to_heap = (context->function() != NULL | |
12163 | || !is_constant_initializer | |
12164 | || (element_type->has_pointer() | |
12165 | && !context->is_const())); | |
e440a328 | 12166 | |
f23d7786 | 12167 | Expression* space; |
d8829beb | 12168 | if (!copy_to_heap) |
e440a328 | 12169 | { |
f23d7786 | 12170 | // The initializer will only run once. |
12171 | space = Expression::make_unary(OPERATOR_AND, array_val, loc); | |
12172 | space->unary_expression()->set_is_slice_init(); | |
e440a328 | 12173 | } |
12174 | else | |
f23d7786 | 12175 | space = Expression::make_heap_expression(array_val, loc); |
e440a328 | 12176 | |
2c809f8f | 12177 | // Build a constructor for the slice. |
e440a328 | 12178 | |
f23d7786 | 12179 | Expression* len = this->valtype_->array_type()->length(); |
12180 | Expression* slice_val = | |
12181 | Expression::make_slice_value(this->type(), space, len, len, loc); | |
ea664253 | 12182 | return slice_val->get_backend(context); |
e440a328 | 12183 | } |
12184 | ||
12185 | // Make a slice composite literal. This is used by the type | |
12186 | // descriptor code. | |
12187 | ||
12188 | Expression* | |
12189 | Expression::make_slice_composite_literal(Type* type, Expression_list* vals, | |
b13c66cd | 12190 | Location location) |
e440a328 | 12191 | { |
411eb89e | 12192 | go_assert(type->is_slice_type()); |
2c809f8f | 12193 | return new Slice_construction_expression(type, NULL, vals, location); |
e440a328 | 12194 | } |
12195 | ||
da244e59 | 12196 | // Class Map_construction_expression. |
e440a328 | 12197 | |
12198 | // Traversal. | |
12199 | ||
12200 | int | |
12201 | Map_construction_expression::do_traverse(Traverse* traverse) | |
12202 | { | |
12203 | if (this->vals_ != NULL | |
12204 | && this->vals_->traverse(traverse) == TRAVERSE_EXIT) | |
12205 | return TRAVERSE_EXIT; | |
12206 | if (Type::traverse(this->type_, traverse) == TRAVERSE_EXIT) | |
12207 | return TRAVERSE_EXIT; | |
12208 | return TRAVERSE_CONTINUE; | |
12209 | } | |
12210 | ||
2c809f8f | 12211 | // Flatten constructor initializer into a temporary variable since |
12212 | // we need to take its address for __go_construct_map. | |
12213 | ||
12214 | Expression* | |
12215 | Map_construction_expression::do_flatten(Gogo* gogo, Named_object*, | |
12216 | Statement_inserter* inserter) | |
12217 | { | |
12218 | if (!this->is_error_expression() | |
12219 | && this->vals_ != NULL | |
12220 | && !this->vals_->empty() | |
12221 | && this->constructor_temp_ == NULL) | |
12222 | { | |
12223 | Map_type* mt = this->type_->map_type(); | |
12224 | Type* key_type = mt->key_type(); | |
12225 | Type* val_type = mt->val_type(); | |
12226 | this->element_type_ = Type::make_builtin_struct_type(2, | |
12227 | "__key", key_type, | |
12228 | "__val", val_type); | |
12229 | ||
12230 | Expression_list* value_pairs = new Expression_list(); | |
12231 | Location loc = this->location(); | |
12232 | ||
12233 | size_t i = 0; | |
12234 | for (Expression_list::const_iterator pv = this->vals_->begin(); | |
12235 | pv != this->vals_->end(); | |
12236 | ++pv, ++i) | |
12237 | { | |
12238 | Expression_list* key_value_pair = new Expression_list(); | |
91c0fd76 | 12239 | Expression* key = *pv; |
5bf8be8b | 12240 | if (key->is_error_expression() || key->type()->is_error_type()) |
12241 | { | |
12242 | go_assert(saw_errors()); | |
12243 | return Expression::make_error(loc); | |
12244 | } | |
91c0fd76 | 12245 | if (key->type()->interface_type() != NULL && !key->is_variable()) |
12246 | { | |
12247 | Temporary_statement* temp = | |
12248 | Statement::make_temporary(NULL, key, loc); | |
12249 | inserter->insert(temp); | |
12250 | key = Expression::make_temporary_reference(temp, loc); | |
12251 | } | |
12252 | key = Expression::convert_for_assignment(gogo, key_type, key, loc); | |
2c809f8f | 12253 | |
12254 | ++pv; | |
91c0fd76 | 12255 | Expression* val = *pv; |
5bf8be8b | 12256 | if (val->is_error_expression() || val->type()->is_error_type()) |
12257 | { | |
12258 | go_assert(saw_errors()); | |
12259 | return Expression::make_error(loc); | |
12260 | } | |
91c0fd76 | 12261 | if (val->type()->interface_type() != NULL && !val->is_variable()) |
12262 | { | |
12263 | Temporary_statement* temp = | |
12264 | Statement::make_temporary(NULL, val, loc); | |
12265 | inserter->insert(temp); | |
12266 | val = Expression::make_temporary_reference(temp, loc); | |
12267 | } | |
12268 | val = Expression::convert_for_assignment(gogo, val_type, val, loc); | |
2c809f8f | 12269 | |
12270 | key_value_pair->push_back(key); | |
12271 | key_value_pair->push_back(val); | |
12272 | value_pairs->push_back( | |
12273 | Expression::make_struct_composite_literal(this->element_type_, | |
12274 | key_value_pair, loc)); | |
12275 | } | |
12276 | ||
e67508fa | 12277 | Expression* element_count = Expression::make_integer_ul(i, NULL, loc); |
2c809f8f | 12278 | Type* ctor_type = |
12279 | Type::make_array_type(this->element_type_, element_count); | |
12280 | Expression* constructor = | |
12281 | new Fixed_array_construction_expression(ctor_type, NULL, | |
12282 | value_pairs, loc); | |
12283 | ||
12284 | this->constructor_temp_ = | |
12285 | Statement::make_temporary(NULL, constructor, loc); | |
12286 | constructor->issue_nil_check(); | |
12287 | this->constructor_temp_->set_is_address_taken(); | |
12288 | inserter->insert(this->constructor_temp_); | |
12289 | } | |
12290 | ||
12291 | return this; | |
12292 | } | |
12293 | ||
e440a328 | 12294 | // Final type determination. |
12295 | ||
12296 | void | |
12297 | Map_construction_expression::do_determine_type(const Type_context*) | |
12298 | { | |
12299 | if (this->vals_ == NULL) | |
12300 | return; | |
12301 | ||
12302 | Map_type* mt = this->type_->map_type(); | |
12303 | Type_context key_context(mt->key_type(), false); | |
12304 | Type_context val_context(mt->val_type(), false); | |
12305 | for (Expression_list::const_iterator pv = this->vals_->begin(); | |
12306 | pv != this->vals_->end(); | |
12307 | ++pv) | |
12308 | { | |
12309 | (*pv)->determine_type(&key_context); | |
12310 | ++pv; | |
12311 | (*pv)->determine_type(&val_context); | |
12312 | } | |
12313 | } | |
12314 | ||
12315 | // Check types. | |
12316 | ||
12317 | void | |
12318 | Map_construction_expression::do_check_types(Gogo*) | |
12319 | { | |
12320 | if (this->vals_ == NULL) | |
12321 | return; | |
12322 | ||
12323 | Map_type* mt = this->type_->map_type(); | |
12324 | int i = 0; | |
12325 | Type* key_type = mt->key_type(); | |
12326 | Type* val_type = mt->val_type(); | |
12327 | for (Expression_list::const_iterator pv = this->vals_->begin(); | |
12328 | pv != this->vals_->end(); | |
12329 | ++pv, ++i) | |
12330 | { | |
12331 | if (!Type::are_assignable(key_type, (*pv)->type(), NULL)) | |
12332 | { | |
12333 | error_at((*pv)->location(), | |
12334 | "incompatible type for element %d key in map construction", | |
12335 | i + 1); | |
12336 | this->set_is_error(); | |
12337 | } | |
12338 | ++pv; | |
12339 | if (!Type::are_assignable(val_type, (*pv)->type(), NULL)) | |
12340 | { | |
12341 | error_at((*pv)->location(), | |
12342 | ("incompatible type for element %d value " | |
12343 | "in map construction"), | |
12344 | i + 1); | |
12345 | this->set_is_error(); | |
12346 | } | |
12347 | } | |
12348 | } | |
12349 | ||
ea664253 | 12350 | // Return the backend representation for constructing a map. |
e440a328 | 12351 | |
ea664253 | 12352 | Bexpression* |
12353 | Map_construction_expression::do_get_backend(Translate_context* context) | |
e440a328 | 12354 | { |
2c809f8f | 12355 | if (this->is_error_expression()) |
ea664253 | 12356 | return context->backend()->error_expression(); |
2c809f8f | 12357 | Location loc = this->location(); |
e440a328 | 12358 | |
e440a328 | 12359 | size_t i = 0; |
2c809f8f | 12360 | Expression* ventries; |
e440a328 | 12361 | if (this->vals_ == NULL || this->vals_->empty()) |
2c809f8f | 12362 | ventries = Expression::make_nil(loc); |
e440a328 | 12363 | else |
12364 | { | |
2c809f8f | 12365 | go_assert(this->constructor_temp_ != NULL); |
12366 | i = this->vals_->size() / 2; | |
e440a328 | 12367 | |
2c809f8f | 12368 | Expression* ctor_ref = |
12369 | Expression::make_temporary_reference(this->constructor_temp_, loc); | |
12370 | ventries = Expression::make_unary(OPERATOR_AND, ctor_ref, loc); | |
12371 | } | |
e440a328 | 12372 | |
2c809f8f | 12373 | Map_type* mt = this->type_->map_type(); |
12374 | if (this->element_type_ == NULL) | |
12375 | this->element_type_ = | |
12376 | Type::make_builtin_struct_type(2, | |
12377 | "__key", mt->key_type(), | |
12378 | "__val", mt->val_type()); | |
12379 | Expression* descriptor = Expression::make_map_descriptor(mt, loc); | |
12380 | ||
12381 | Type* uintptr_t = Type::lookup_integer_type("uintptr"); | |
e67508fa | 12382 | Expression* count = Expression::make_integer_ul(i, uintptr_t, loc); |
2c809f8f | 12383 | |
12384 | Expression* entry_size = | |
12385 | Expression::make_type_info(this->element_type_, TYPE_INFO_SIZE); | |
12386 | ||
12387 | unsigned int field_index; | |
12388 | const Struct_field* valfield = | |
12389 | this->element_type_->find_local_field("__val", &field_index); | |
12390 | Expression* val_offset = | |
12391 | Expression::make_struct_field_offset(this->element_type_, valfield); | |
12392 | Expression* val_size = | |
12393 | Expression::make_type_info(mt->val_type(), TYPE_INFO_SIZE); | |
12394 | ||
12395 | Expression* map_ctor = | |
12396 | Runtime::make_call(Runtime::CONSTRUCT_MAP, loc, 6, descriptor, count, | |
12397 | entry_size, val_offset, val_size, ventries); | |
ea664253 | 12398 | return map_ctor->get_backend(context); |
2c809f8f | 12399 | } |
e440a328 | 12400 | |
2c809f8f | 12401 | // Export an array construction. |
e440a328 | 12402 | |
2c809f8f | 12403 | void |
12404 | Map_construction_expression::do_export(Export* exp) const | |
12405 | { | |
12406 | exp->write_c_string("convert("); | |
12407 | exp->write_type(this->type_); | |
12408 | for (Expression_list::const_iterator pv = this->vals_->begin(); | |
12409 | pv != this->vals_->end(); | |
12410 | ++pv) | |
12411 | { | |
12412 | exp->write_c_string(", "); | |
12413 | (*pv)->export_expression(exp); | |
12414 | } | |
12415 | exp->write_c_string(")"); | |
12416 | } | |
e440a328 | 12417 | |
2c809f8f | 12418 | // Dump ast representation for a map construction expression. |
d751bb78 | 12419 | |
12420 | void | |
12421 | Map_construction_expression::do_dump_expression( | |
12422 | Ast_dump_context* ast_dump_context) const | |
12423 | { | |
d751bb78 | 12424 | ast_dump_context->ostream() << "{" ; |
8b1c301d | 12425 | ast_dump_context->dump_expression_list(this->vals_, true); |
d751bb78 | 12426 | ast_dump_context->ostream() << "}"; |
12427 | } | |
12428 | ||
e440a328 | 12429 | // A general composite literal. This is lowered to a type specific |
12430 | // version. | |
12431 | ||
12432 | class Composite_literal_expression : public Parser_expression | |
12433 | { | |
12434 | public: | |
12435 | Composite_literal_expression(Type* type, int depth, bool has_keys, | |
62750cd5 | 12436 | Expression_list* vals, bool all_are_names, |
12437 | Location location) | |
e440a328 | 12438 | : Parser_expression(EXPRESSION_COMPOSITE_LITERAL, location), |
62750cd5 | 12439 | type_(type), depth_(depth), vals_(vals), has_keys_(has_keys), |
12440 | all_are_names_(all_are_names) | |
e440a328 | 12441 | { } |
12442 | ||
12443 | protected: | |
12444 | int | |
12445 | do_traverse(Traverse* traverse); | |
12446 | ||
12447 | Expression* | |
ceeb4318 | 12448 | do_lower(Gogo*, Named_object*, Statement_inserter*, int); |
e440a328 | 12449 | |
12450 | Expression* | |
12451 | do_copy() | |
12452 | { | |
12453 | return new Composite_literal_expression(this->type_, this->depth_, | |
12454 | this->has_keys_, | |
12455 | (this->vals_ == NULL | |
12456 | ? NULL | |
12457 | : this->vals_->copy()), | |
62750cd5 | 12458 | this->all_are_names_, |
e440a328 | 12459 | this->location()); |
12460 | } | |
12461 | ||
d751bb78 | 12462 | void |
12463 | do_dump_expression(Ast_dump_context*) const; | |
12464 | ||
e440a328 | 12465 | private: |
12466 | Expression* | |
81c4b26b | 12467 | lower_struct(Gogo*, Type*); |
e440a328 | 12468 | |
12469 | Expression* | |
113ef6a5 | 12470 | lower_array(Type*); |
e440a328 | 12471 | |
12472 | Expression* | |
ffe743ca | 12473 | make_array(Type*, const std::vector<unsigned long>*, Expression_list*); |
e440a328 | 12474 | |
12475 | Expression* | |
ceeb4318 | 12476 | lower_map(Gogo*, Named_object*, Statement_inserter*, Type*); |
e440a328 | 12477 | |
12478 | // The type of the composite literal. | |
12479 | Type* type_; | |
12480 | // The depth within a list of composite literals within a composite | |
12481 | // literal, when the type is omitted. | |
12482 | int depth_; | |
12483 | // The values to put in the composite literal. | |
12484 | Expression_list* vals_; | |
12485 | // If this is true, then VALS_ is a list of pairs: a key and a | |
12486 | // value. In an array initializer, a missing key will be NULL. | |
12487 | bool has_keys_; | |
62750cd5 | 12488 | // If this is true, then HAS_KEYS_ is true, and every key is a |
12489 | // simple identifier. | |
12490 | bool all_are_names_; | |
e440a328 | 12491 | }; |
12492 | ||
12493 | // Traversal. | |
12494 | ||
12495 | int | |
12496 | Composite_literal_expression::do_traverse(Traverse* traverse) | |
12497 | { | |
dbffccfc | 12498 | if (Type::traverse(this->type_, traverse) == TRAVERSE_EXIT) |
e440a328 | 12499 | return TRAVERSE_EXIT; |
dbffccfc | 12500 | |
12501 | // If this is a struct composite literal with keys, then the keys | |
12502 | // are field names, not expressions. We don't want to traverse them | |
12503 | // in that case. If we do, we can give an erroneous error "variable | |
12504 | // initializer refers to itself." See bug482.go in the testsuite. | |
12505 | if (this->has_keys_ && this->vals_ != NULL) | |
12506 | { | |
12507 | // The type may not be resolvable at this point. | |
12508 | Type* type = this->type_; | |
a01f2481 | 12509 | |
12510 | for (int depth = this->depth_; depth > 0; --depth) | |
12511 | { | |
12512 | if (type->array_type() != NULL) | |
12513 | type = type->array_type()->element_type(); | |
12514 | else if (type->map_type() != NULL) | |
12515 | type = type->map_type()->val_type(); | |
12516 | else | |
12517 | { | |
12518 | // This error will be reported during lowering. | |
12519 | return TRAVERSE_CONTINUE; | |
12520 | } | |
12521 | } | |
12522 | ||
dbffccfc | 12523 | while (true) |
12524 | { | |
12525 | if (type->classification() == Type::TYPE_NAMED) | |
12526 | type = type->named_type()->real_type(); | |
12527 | else if (type->classification() == Type::TYPE_FORWARD) | |
12528 | { | |
12529 | Type* t = type->forwarded(); | |
12530 | if (t == type) | |
12531 | break; | |
12532 | type = t; | |
12533 | } | |
12534 | else | |
12535 | break; | |
12536 | } | |
12537 | ||
12538 | if (type->classification() == Type::TYPE_STRUCT) | |
12539 | { | |
12540 | Expression_list::iterator p = this->vals_->begin(); | |
12541 | while (p != this->vals_->end()) | |
12542 | { | |
12543 | // Skip key. | |
12544 | ++p; | |
12545 | go_assert(p != this->vals_->end()); | |
12546 | if (Expression::traverse(&*p, traverse) == TRAVERSE_EXIT) | |
12547 | return TRAVERSE_EXIT; | |
12548 | ++p; | |
12549 | } | |
12550 | return TRAVERSE_CONTINUE; | |
12551 | } | |
12552 | } | |
12553 | ||
12554 | if (this->vals_ != NULL) | |
12555 | return this->vals_->traverse(traverse); | |
12556 | ||
12557 | return TRAVERSE_CONTINUE; | |
e440a328 | 12558 | } |
12559 | ||
12560 | // Lower a generic composite literal into a specific version based on | |
12561 | // the type. | |
12562 | ||
12563 | Expression* | |
ceeb4318 | 12564 | Composite_literal_expression::do_lower(Gogo* gogo, Named_object* function, |
12565 | Statement_inserter* inserter, int) | |
e440a328 | 12566 | { |
12567 | Type* type = this->type_; | |
12568 | ||
12569 | for (int depth = this->depth_; depth > 0; --depth) | |
12570 | { | |
12571 | if (type->array_type() != NULL) | |
12572 | type = type->array_type()->element_type(); | |
12573 | else if (type->map_type() != NULL) | |
12574 | type = type->map_type()->val_type(); | |
12575 | else | |
12576 | { | |
5c13bd80 | 12577 | if (!type->is_error()) |
e440a328 | 12578 | error_at(this->location(), |
12579 | ("may only omit types within composite literals " | |
12580 | "of slice, array, or map type")); | |
12581 | return Expression::make_error(this->location()); | |
12582 | } | |
12583 | } | |
12584 | ||
e00772b3 | 12585 | Type *pt = type->points_to(); |
12586 | bool is_pointer = false; | |
12587 | if (pt != NULL) | |
12588 | { | |
12589 | is_pointer = true; | |
12590 | type = pt; | |
12591 | } | |
12592 | ||
12593 | Expression* ret; | |
5c13bd80 | 12594 | if (type->is_error()) |
e440a328 | 12595 | return Expression::make_error(this->location()); |
12596 | else if (type->struct_type() != NULL) | |
e00772b3 | 12597 | ret = this->lower_struct(gogo, type); |
e440a328 | 12598 | else if (type->array_type() != NULL) |
113ef6a5 | 12599 | ret = this->lower_array(type); |
e440a328 | 12600 | else if (type->map_type() != NULL) |
e00772b3 | 12601 | ret = this->lower_map(gogo, function, inserter, type); |
e440a328 | 12602 | else |
12603 | { | |
12604 | error_at(this->location(), | |
12605 | ("expected struct, slice, array, or map type " | |
12606 | "for composite literal")); | |
12607 | return Expression::make_error(this->location()); | |
12608 | } | |
e00772b3 | 12609 | |
12610 | if (is_pointer) | |
2c809f8f | 12611 | ret = Expression::make_heap_expression(ret, this->location()); |
e00772b3 | 12612 | |
12613 | return ret; | |
e440a328 | 12614 | } |
12615 | ||
12616 | // Lower a struct composite literal. | |
12617 | ||
12618 | Expression* | |
81c4b26b | 12619 | Composite_literal_expression::lower_struct(Gogo* gogo, Type* type) |
e440a328 | 12620 | { |
b13c66cd | 12621 | Location location = this->location(); |
e440a328 | 12622 | Struct_type* st = type->struct_type(); |
12623 | if (this->vals_ == NULL || !this->has_keys_) | |
07daa4e7 | 12624 | { |
e6013c28 | 12625 | if (this->vals_ != NULL |
12626 | && !this->vals_->empty() | |
12627 | && type->named_type() != NULL | |
12628 | && type->named_type()->named_object()->package() != NULL) | |
12629 | { | |
12630 | for (Struct_field_list::const_iterator pf = st->fields()->begin(); | |
12631 | pf != st->fields()->end(); | |
12632 | ++pf) | |
07daa4e7 | 12633 | { |
07ba7f26 | 12634 | if (Gogo::is_hidden_name(pf->field_name()) |
12635 | || pf->is_embedded_builtin(gogo)) | |
07daa4e7 | 12636 | error_at(this->location(), |
e6013c28 | 12637 | "assignment of unexported field %qs in %qs literal", |
12638 | Gogo::message_name(pf->field_name()).c_str(), | |
12639 | type->named_type()->message_name().c_str()); | |
07daa4e7 | 12640 | } |
12641 | } | |
12642 | ||
12643 | return new Struct_construction_expression(type, this->vals_, location); | |
12644 | } | |
e440a328 | 12645 | |
12646 | size_t field_count = st->field_count(); | |
12647 | std::vector<Expression*> vals(field_count); | |
0c4f5a19 | 12648 | std::vector<int>* traverse_order = new(std::vector<int>); |
e440a328 | 12649 | Expression_list::const_iterator p = this->vals_->begin(); |
62750cd5 | 12650 | Expression* external_expr = NULL; |
12651 | const Named_object* external_no = NULL; | |
e440a328 | 12652 | while (p != this->vals_->end()) |
12653 | { | |
12654 | Expression* name_expr = *p; | |
12655 | ||
12656 | ++p; | |
c484d925 | 12657 | go_assert(p != this->vals_->end()); |
e440a328 | 12658 | Expression* val = *p; |
12659 | ||
12660 | ++p; | |
12661 | ||
12662 | if (name_expr == NULL) | |
12663 | { | |
12664 | error_at(val->location(), "mixture of field and value initializers"); | |
12665 | return Expression::make_error(location); | |
12666 | } | |
12667 | ||
12668 | bool bad_key = false; | |
12669 | std::string name; | |
81c4b26b | 12670 | const Named_object* no = NULL; |
e440a328 | 12671 | switch (name_expr->classification()) |
12672 | { | |
12673 | case EXPRESSION_UNKNOWN_REFERENCE: | |
12674 | name = name_expr->unknown_expression()->name(); | |
7f7ce694 | 12675 | if (type->named_type() != NULL) |
12676 | { | |
12677 | // If the named object found for this field name comes from a | |
12678 | // different package than the struct it is a part of, do not count | |
12679 | // this incorrect lookup as a usage of the object's package. | |
12680 | no = name_expr->unknown_expression()->named_object(); | |
12681 | if (no->package() != NULL | |
12682 | && no->package() != type->named_type()->named_object()->package()) | |
12683 | no->package()->forget_usage(name_expr); | |
12684 | } | |
e440a328 | 12685 | break; |
12686 | ||
12687 | case EXPRESSION_CONST_REFERENCE: | |
81c4b26b | 12688 | no = static_cast<Const_expression*>(name_expr)->named_object(); |
e440a328 | 12689 | break; |
12690 | ||
12691 | case EXPRESSION_TYPE: | |
12692 | { | |
12693 | Type* t = name_expr->type(); | |
12694 | Named_type* nt = t->named_type(); | |
12695 | if (nt == NULL) | |
12696 | bad_key = true; | |
12697 | else | |
81c4b26b | 12698 | no = nt->named_object(); |
e440a328 | 12699 | } |
12700 | break; | |
12701 | ||
12702 | case EXPRESSION_VAR_REFERENCE: | |
81c4b26b | 12703 | no = name_expr->var_expression()->named_object(); |
e440a328 | 12704 | break; |
12705 | ||
12706 | case EXPRESSION_FUNC_REFERENCE: | |
81c4b26b | 12707 | no = name_expr->func_expression()->named_object(); |
e440a328 | 12708 | break; |
12709 | ||
12710 | case EXPRESSION_UNARY: | |
12711 | // If there is a local variable around with the same name as | |
12712 | // the field, and this occurs in the closure, then the | |
12713 | // parser may turn the field reference into an indirection | |
12714 | // through the closure. FIXME: This is a mess. | |
12715 | { | |
12716 | bad_key = true; | |
12717 | Unary_expression* ue = static_cast<Unary_expression*>(name_expr); | |
12718 | if (ue->op() == OPERATOR_MULT) | |
12719 | { | |
12720 | Field_reference_expression* fre = | |
12721 | ue->operand()->field_reference_expression(); | |
12722 | if (fre != NULL) | |
12723 | { | |
12724 | Struct_type* st = | |
12725 | fre->expr()->type()->deref()->struct_type(); | |
12726 | if (st != NULL) | |
12727 | { | |
12728 | const Struct_field* sf = st->field(fre->field_index()); | |
12729 | name = sf->field_name(); | |
2d29d278 | 12730 | |
12731 | // See below. FIXME. | |
12732 | if (!Gogo::is_hidden_name(name) | |
12733 | && name[0] >= 'a' | |
12734 | && name[0] <= 'z') | |
12735 | { | |
12736 | if (gogo->lookup_global(name.c_str()) != NULL) | |
12737 | name = gogo->pack_hidden_name(name, false); | |
12738 | } | |
12739 | ||
e440a328 | 12740 | char buf[20]; |
12741 | snprintf(buf, sizeof buf, "%u", fre->field_index()); | |
12742 | size_t buflen = strlen(buf); | |
12743 | if (name.compare(name.length() - buflen, buflen, buf) | |
12744 | == 0) | |
12745 | { | |
12746 | name = name.substr(0, name.length() - buflen); | |
12747 | bad_key = false; | |
12748 | } | |
12749 | } | |
12750 | } | |
12751 | } | |
12752 | } | |
12753 | break; | |
12754 | ||
12755 | default: | |
12756 | bad_key = true; | |
12757 | break; | |
12758 | } | |
12759 | if (bad_key) | |
12760 | { | |
12761 | error_at(name_expr->location(), "expected struct field name"); | |
12762 | return Expression::make_error(location); | |
12763 | } | |
12764 | ||
81c4b26b | 12765 | if (no != NULL) |
12766 | { | |
62750cd5 | 12767 | if (no->package() != NULL && external_expr == NULL) |
12768 | { | |
12769 | external_expr = name_expr; | |
12770 | external_no = no; | |
12771 | } | |
12772 | ||
81c4b26b | 12773 | name = no->name(); |
12774 | ||
12775 | // A predefined name won't be packed. If it starts with a | |
12776 | // lower case letter we need to check for that case, because | |
2d29d278 | 12777 | // the field name will be packed. FIXME. |
81c4b26b | 12778 | if (!Gogo::is_hidden_name(name) |
12779 | && name[0] >= 'a' | |
12780 | && name[0] <= 'z') | |
12781 | { | |
12782 | Named_object* gno = gogo->lookup_global(name.c_str()); | |
12783 | if (gno == no) | |
12784 | name = gogo->pack_hidden_name(name, false); | |
12785 | } | |
12786 | } | |
12787 | ||
e440a328 | 12788 | unsigned int index; |
12789 | const Struct_field* sf = st->find_local_field(name, &index); | |
12790 | if (sf == NULL) | |
12791 | { | |
12792 | error_at(name_expr->location(), "unknown field %qs in %qs", | |
12793 | Gogo::message_name(name).c_str(), | |
12794 | (type->named_type() != NULL | |
12795 | ? type->named_type()->message_name().c_str() | |
12796 | : "unnamed struct")); | |
12797 | return Expression::make_error(location); | |
12798 | } | |
12799 | if (vals[index] != NULL) | |
12800 | { | |
12801 | error_at(name_expr->location(), | |
12802 | "duplicate value for field %qs in %qs", | |
12803 | Gogo::message_name(name).c_str(), | |
12804 | (type->named_type() != NULL | |
12805 | ? type->named_type()->message_name().c_str() | |
12806 | : "unnamed struct")); | |
12807 | return Expression::make_error(location); | |
12808 | } | |
12809 | ||
07daa4e7 | 12810 | if (type->named_type() != NULL |
12811 | && type->named_type()->named_object()->package() != NULL | |
07ba7f26 | 12812 | && (Gogo::is_hidden_name(sf->field_name()) |
12813 | || sf->is_embedded_builtin(gogo))) | |
07daa4e7 | 12814 | error_at(name_expr->location(), |
12815 | "assignment of unexported field %qs in %qs literal", | |
12816 | Gogo::message_name(sf->field_name()).c_str(), | |
12817 | type->named_type()->message_name().c_str()); | |
07daa4e7 | 12818 | |
e440a328 | 12819 | vals[index] = val; |
0c4f5a19 | 12820 | traverse_order->push_back(index); |
e440a328 | 12821 | } |
12822 | ||
62750cd5 | 12823 | if (!this->all_are_names_) |
12824 | { | |
12825 | // This is a weird case like bug462 in the testsuite. | |
12826 | if (external_expr == NULL) | |
12827 | error_at(this->location(), "unknown field in %qs literal", | |
12828 | (type->named_type() != NULL | |
12829 | ? type->named_type()->message_name().c_str() | |
12830 | : "unnamed struct")); | |
12831 | else | |
12832 | error_at(external_expr->location(), "unknown field %qs in %qs", | |
12833 | external_no->message_name().c_str(), | |
12834 | (type->named_type() != NULL | |
12835 | ? type->named_type()->message_name().c_str() | |
12836 | : "unnamed struct")); | |
12837 | return Expression::make_error(location); | |
12838 | } | |
12839 | ||
e440a328 | 12840 | Expression_list* list = new Expression_list; |
12841 | list->reserve(field_count); | |
12842 | for (size_t i = 0; i < field_count; ++i) | |
12843 | list->push_back(vals[i]); | |
12844 | ||
0c4f5a19 | 12845 | Struct_construction_expression* ret = |
12846 | new Struct_construction_expression(type, list, location); | |
12847 | ret->set_traverse_order(traverse_order); | |
12848 | return ret; | |
e440a328 | 12849 | } |
12850 | ||
00773463 | 12851 | // Used to sort an index/value array. |
12852 | ||
12853 | class Index_value_compare | |
12854 | { | |
12855 | public: | |
12856 | bool | |
12857 | operator()(const std::pair<unsigned long, Expression*>& a, | |
12858 | const std::pair<unsigned long, Expression*>& b) | |
12859 | { return a.first < b.first; } | |
12860 | }; | |
12861 | ||
e440a328 | 12862 | // Lower an array composite literal. |
12863 | ||
12864 | Expression* | |
113ef6a5 | 12865 | Composite_literal_expression::lower_array(Type* type) |
e440a328 | 12866 | { |
b13c66cd | 12867 | Location location = this->location(); |
e440a328 | 12868 | if (this->vals_ == NULL || !this->has_keys_) |
ffe743ca | 12869 | return this->make_array(type, NULL, this->vals_); |
e440a328 | 12870 | |
ffe743ca | 12871 | std::vector<unsigned long>* indexes = new std::vector<unsigned long>; |
12872 | indexes->reserve(this->vals_->size()); | |
00773463 | 12873 | bool indexes_out_of_order = false; |
ffe743ca | 12874 | Expression_list* vals = new Expression_list(); |
12875 | vals->reserve(this->vals_->size()); | |
e440a328 | 12876 | unsigned long index = 0; |
12877 | Expression_list::const_iterator p = this->vals_->begin(); | |
12878 | while (p != this->vals_->end()) | |
12879 | { | |
12880 | Expression* index_expr = *p; | |
12881 | ||
12882 | ++p; | |
c484d925 | 12883 | go_assert(p != this->vals_->end()); |
e440a328 | 12884 | Expression* val = *p; |
12885 | ||
12886 | ++p; | |
12887 | ||
ffe743ca | 12888 | if (index_expr == NULL) |
12889 | { | |
12890 | if (!indexes->empty()) | |
12891 | indexes->push_back(index); | |
12892 | } | |
12893 | else | |
e440a328 | 12894 | { |
ffe743ca | 12895 | if (indexes->empty() && !vals->empty()) |
12896 | { | |
12897 | for (size_t i = 0; i < vals->size(); ++i) | |
12898 | indexes->push_back(i); | |
12899 | } | |
12900 | ||
0c77715b | 12901 | Numeric_constant nc; |
12902 | if (!index_expr->numeric_constant_value(&nc)) | |
e440a328 | 12903 | { |
e440a328 | 12904 | error_at(index_expr->location(), |
12905 | "index expression is not integer constant"); | |
12906 | return Expression::make_error(location); | |
12907 | } | |
6f6d9955 | 12908 | |
0c77715b | 12909 | switch (nc.to_unsigned_long(&index)) |
e440a328 | 12910 | { |
0c77715b | 12911 | case Numeric_constant::NC_UL_VALID: |
12912 | break; | |
12913 | case Numeric_constant::NC_UL_NOTINT: | |
12914 | error_at(index_expr->location(), | |
12915 | "index expression is not integer constant"); | |
12916 | return Expression::make_error(location); | |
12917 | case Numeric_constant::NC_UL_NEGATIVE: | |
e440a328 | 12918 | error_at(index_expr->location(), "index expression is negative"); |
12919 | return Expression::make_error(location); | |
0c77715b | 12920 | case Numeric_constant::NC_UL_BIG: |
e440a328 | 12921 | error_at(index_expr->location(), "index value overflow"); |
12922 | return Expression::make_error(location); | |
0c77715b | 12923 | default: |
12924 | go_unreachable(); | |
e440a328 | 12925 | } |
6f6d9955 | 12926 | |
12927 | Named_type* ntype = Type::lookup_integer_type("int"); | |
12928 | Integer_type* inttype = ntype->integer_type(); | |
0c77715b | 12929 | if (sizeof(index) <= static_cast<size_t>(inttype->bits() * 8) |
12930 | && index >> (inttype->bits() - 1) != 0) | |
6f6d9955 | 12931 | { |
6f6d9955 | 12932 | error_at(index_expr->location(), "index value overflow"); |
12933 | return Expression::make_error(location); | |
12934 | } | |
12935 | ||
ffe743ca | 12936 | if (std::find(indexes->begin(), indexes->end(), index) |
12937 | != indexes->end()) | |
e440a328 | 12938 | { |
ffe743ca | 12939 | error_at(index_expr->location(), "duplicate value for index %lu", |
e440a328 | 12940 | index); |
12941 | return Expression::make_error(location); | |
12942 | } | |
ffe743ca | 12943 | |
00773463 | 12944 | if (!indexes->empty() && index < indexes->back()) |
12945 | indexes_out_of_order = true; | |
12946 | ||
ffe743ca | 12947 | indexes->push_back(index); |
e440a328 | 12948 | } |
12949 | ||
ffe743ca | 12950 | vals->push_back(val); |
12951 | ||
e440a328 | 12952 | ++index; |
12953 | } | |
12954 | ||
ffe743ca | 12955 | if (indexes->empty()) |
12956 | { | |
12957 | delete indexes; | |
12958 | indexes = NULL; | |
12959 | } | |
e440a328 | 12960 | |
00773463 | 12961 | if (indexes_out_of_order) |
12962 | { | |
12963 | typedef std::vector<std::pair<unsigned long, Expression*> > V; | |
12964 | ||
12965 | V v; | |
12966 | v.reserve(indexes->size()); | |
12967 | std::vector<unsigned long>::const_iterator pi = indexes->begin(); | |
12968 | for (Expression_list::const_iterator pe = vals->begin(); | |
12969 | pe != vals->end(); | |
12970 | ++pe, ++pi) | |
12971 | v.push_back(std::make_pair(*pi, *pe)); | |
12972 | ||
12973 | std::sort(v.begin(), v.end(), Index_value_compare()); | |
12974 | ||
12975 | delete indexes; | |
12976 | delete vals; | |
12977 | indexes = new std::vector<unsigned long>(); | |
12978 | indexes->reserve(v.size()); | |
12979 | vals = new Expression_list(); | |
12980 | vals->reserve(v.size()); | |
12981 | ||
12982 | for (V::const_iterator p = v.begin(); p != v.end(); ++p) | |
12983 | { | |
12984 | indexes->push_back(p->first); | |
12985 | vals->push_back(p->second); | |
12986 | } | |
12987 | } | |
12988 | ||
ffe743ca | 12989 | return this->make_array(type, indexes, vals); |
e440a328 | 12990 | } |
12991 | ||
12992 | // Actually build the array composite literal. This handles | |
12993 | // [...]{...}. | |
12994 | ||
12995 | Expression* | |
ffe743ca | 12996 | Composite_literal_expression::make_array( |
12997 | Type* type, | |
12998 | const std::vector<unsigned long>* indexes, | |
12999 | Expression_list* vals) | |
e440a328 | 13000 | { |
b13c66cd | 13001 | Location location = this->location(); |
e440a328 | 13002 | Array_type* at = type->array_type(); |
ffe743ca | 13003 | |
e440a328 | 13004 | if (at->length() != NULL && at->length()->is_nil_expression()) |
13005 | { | |
ffe743ca | 13006 | size_t size; |
13007 | if (vals == NULL) | |
13008 | size = 0; | |
00773463 | 13009 | else if (indexes != NULL) |
13010 | size = indexes->back() + 1; | |
13011 | else | |
ffe743ca | 13012 | { |
13013 | size = vals->size(); | |
13014 | Integer_type* it = Type::lookup_integer_type("int")->integer_type(); | |
13015 | if (sizeof(size) <= static_cast<size_t>(it->bits() * 8) | |
13016 | && size >> (it->bits() - 1) != 0) | |
13017 | { | |
13018 | error_at(location, "too many elements in composite literal"); | |
13019 | return Expression::make_error(location); | |
13020 | } | |
13021 | } | |
ffe743ca | 13022 | |
e67508fa | 13023 | Expression* elen = Expression::make_integer_ul(size, NULL, location); |
e440a328 | 13024 | at = Type::make_array_type(at->element_type(), elen); |
13025 | type = at; | |
13026 | } | |
ffe743ca | 13027 | else if (at->length() != NULL |
13028 | && !at->length()->is_error_expression() | |
13029 | && this->vals_ != NULL) | |
13030 | { | |
13031 | Numeric_constant nc; | |
13032 | unsigned long val; | |
13033 | if (at->length()->numeric_constant_value(&nc) | |
13034 | && nc.to_unsigned_long(&val) == Numeric_constant::NC_UL_VALID) | |
13035 | { | |
13036 | if (indexes == NULL) | |
13037 | { | |
13038 | if (this->vals_->size() > val) | |
13039 | { | |
13040 | error_at(location, "too many elements in composite literal"); | |
13041 | return Expression::make_error(location); | |
13042 | } | |
13043 | } | |
13044 | else | |
13045 | { | |
00773463 | 13046 | unsigned long max = indexes->back(); |
ffe743ca | 13047 | if (max >= val) |
13048 | { | |
13049 | error_at(location, | |
13050 | ("some element keys in composite literal " | |
13051 | "are out of range")); | |
13052 | return Expression::make_error(location); | |
13053 | } | |
13054 | } | |
13055 | } | |
13056 | } | |
13057 | ||
e440a328 | 13058 | if (at->length() != NULL) |
ffe743ca | 13059 | return new Fixed_array_construction_expression(type, indexes, vals, |
13060 | location); | |
e440a328 | 13061 | else |
2c809f8f | 13062 | return new Slice_construction_expression(type, indexes, vals, location); |
e440a328 | 13063 | } |
13064 | ||
13065 | // Lower a map composite literal. | |
13066 | ||
13067 | Expression* | |
a287720d | 13068 | Composite_literal_expression::lower_map(Gogo* gogo, Named_object* function, |
ceeb4318 | 13069 | Statement_inserter* inserter, |
a287720d | 13070 | Type* type) |
e440a328 | 13071 | { |
b13c66cd | 13072 | Location location = this->location(); |
e440a328 | 13073 | if (this->vals_ != NULL) |
13074 | { | |
13075 | if (!this->has_keys_) | |
13076 | { | |
13077 | error_at(location, "map composite literal must have keys"); | |
13078 | return Expression::make_error(location); | |
13079 | } | |
13080 | ||
a287720d | 13081 | for (Expression_list::iterator p = this->vals_->begin(); |
e440a328 | 13082 | p != this->vals_->end(); |
13083 | p += 2) | |
13084 | { | |
13085 | if (*p == NULL) | |
13086 | { | |
13087 | ++p; | |
13088 | error_at((*p)->location(), | |
13089 | "map composite literal must have keys for every value"); | |
13090 | return Expression::make_error(location); | |
13091 | } | |
a287720d | 13092 | // Make sure we have lowered the key; it may not have been |
13093 | // lowered in order to handle keys for struct composite | |
13094 | // literals. Lower it now to get the right error message. | |
13095 | if ((*p)->unknown_expression() != NULL) | |
13096 | { | |
13097 | (*p)->unknown_expression()->clear_is_composite_literal_key(); | |
ceeb4318 | 13098 | gogo->lower_expression(function, inserter, &*p); |
c484d925 | 13099 | go_assert((*p)->is_error_expression()); |
a287720d | 13100 | return Expression::make_error(location); |
13101 | } | |
e440a328 | 13102 | } |
13103 | } | |
13104 | ||
13105 | return new Map_construction_expression(type, this->vals_, location); | |
13106 | } | |
13107 | ||
d751bb78 | 13108 | // Dump ast representation for a composite literal expression. |
13109 | ||
13110 | void | |
13111 | Composite_literal_expression::do_dump_expression( | |
13112 | Ast_dump_context* ast_dump_context) const | |
13113 | { | |
8b1c301d | 13114 | ast_dump_context->ostream() << "composite("; |
d751bb78 | 13115 | ast_dump_context->dump_type(this->type_); |
13116 | ast_dump_context->ostream() << ", {"; | |
8b1c301d | 13117 | ast_dump_context->dump_expression_list(this->vals_, this->has_keys_); |
d751bb78 | 13118 | ast_dump_context->ostream() << "})"; |
13119 | } | |
13120 | ||
e440a328 | 13121 | // Make a composite literal expression. |
13122 | ||
13123 | Expression* | |
13124 | Expression::make_composite_literal(Type* type, int depth, bool has_keys, | |
62750cd5 | 13125 | Expression_list* vals, bool all_are_names, |
b13c66cd | 13126 | Location location) |
e440a328 | 13127 | { |
13128 | return new Composite_literal_expression(type, depth, has_keys, vals, | |
62750cd5 | 13129 | all_are_names, location); |
e440a328 | 13130 | } |
13131 | ||
13132 | // Return whether this expression is a composite literal. | |
13133 | ||
13134 | bool | |
13135 | Expression::is_composite_literal() const | |
13136 | { | |
13137 | switch (this->classification_) | |
13138 | { | |
13139 | case EXPRESSION_COMPOSITE_LITERAL: | |
13140 | case EXPRESSION_STRUCT_CONSTRUCTION: | |
13141 | case EXPRESSION_FIXED_ARRAY_CONSTRUCTION: | |
2c809f8f | 13142 | case EXPRESSION_SLICE_CONSTRUCTION: |
e440a328 | 13143 | case EXPRESSION_MAP_CONSTRUCTION: |
13144 | return true; | |
13145 | default: | |
13146 | return false; | |
13147 | } | |
13148 | } | |
13149 | ||
13150 | // Return whether this expression is a composite literal which is not | |
13151 | // constant. | |
13152 | ||
13153 | bool | |
13154 | Expression::is_nonconstant_composite_literal() const | |
13155 | { | |
13156 | switch (this->classification_) | |
13157 | { | |
13158 | case EXPRESSION_STRUCT_CONSTRUCTION: | |
13159 | { | |
13160 | const Struct_construction_expression *psce = | |
13161 | static_cast<const Struct_construction_expression*>(this); | |
13162 | return !psce->is_constant_struct(); | |
13163 | } | |
13164 | case EXPRESSION_FIXED_ARRAY_CONSTRUCTION: | |
13165 | { | |
13166 | const Fixed_array_construction_expression *pace = | |
13167 | static_cast<const Fixed_array_construction_expression*>(this); | |
13168 | return !pace->is_constant_array(); | |
13169 | } | |
2c809f8f | 13170 | case EXPRESSION_SLICE_CONSTRUCTION: |
e440a328 | 13171 | { |
2c809f8f | 13172 | const Slice_construction_expression *pace = |
13173 | static_cast<const Slice_construction_expression*>(this); | |
e440a328 | 13174 | return !pace->is_constant_array(); |
13175 | } | |
13176 | case EXPRESSION_MAP_CONSTRUCTION: | |
13177 | return true; | |
13178 | default: | |
13179 | return false; | |
13180 | } | |
13181 | } | |
13182 | ||
35a54f17 | 13183 | // Return true if this is a variable or temporary_variable. |
13184 | ||
13185 | bool | |
13186 | Expression::is_variable() const | |
13187 | { | |
13188 | switch (this->classification_) | |
13189 | { | |
13190 | case EXPRESSION_VAR_REFERENCE: | |
13191 | case EXPRESSION_TEMPORARY_REFERENCE: | |
13192 | case EXPRESSION_SET_AND_USE_TEMPORARY: | |
13193 | return true; | |
13194 | default: | |
13195 | return false; | |
13196 | } | |
13197 | } | |
13198 | ||
e440a328 | 13199 | // Return true if this is a reference to a local variable. |
13200 | ||
13201 | bool | |
13202 | Expression::is_local_variable() const | |
13203 | { | |
13204 | const Var_expression* ve = this->var_expression(); | |
13205 | if (ve == NULL) | |
13206 | return false; | |
13207 | const Named_object* no = ve->named_object(); | |
13208 | return (no->is_result_variable() | |
13209 | || (no->is_variable() && !no->var_value()->is_global())); | |
13210 | } | |
13211 | ||
13212 | // Class Type_guard_expression. | |
13213 | ||
13214 | // Traversal. | |
13215 | ||
13216 | int | |
13217 | Type_guard_expression::do_traverse(Traverse* traverse) | |
13218 | { | |
13219 | if (Expression::traverse(&this->expr_, traverse) == TRAVERSE_EXIT | |
13220 | || Type::traverse(this->type_, traverse) == TRAVERSE_EXIT) | |
13221 | return TRAVERSE_EXIT; | |
13222 | return TRAVERSE_CONTINUE; | |
13223 | } | |
13224 | ||
2c809f8f | 13225 | Expression* |
13226 | Type_guard_expression::do_flatten(Gogo*, Named_object*, | |
13227 | Statement_inserter* inserter) | |
13228 | { | |
5bf8be8b | 13229 | if (this->expr_->is_error_expression() |
13230 | || this->expr_->type()->is_error_type()) | |
13231 | { | |
13232 | go_assert(saw_errors()); | |
13233 | return Expression::make_error(this->location()); | |
13234 | } | |
13235 | ||
2c809f8f | 13236 | if (!this->expr_->is_variable()) |
13237 | { | |
13238 | Temporary_statement* temp = Statement::make_temporary(NULL, this->expr_, | |
13239 | this->location()); | |
13240 | inserter->insert(temp); | |
13241 | this->expr_ = | |
13242 | Expression::make_temporary_reference(temp, this->location()); | |
13243 | } | |
13244 | return this; | |
13245 | } | |
13246 | ||
e440a328 | 13247 | // Check types of a type guard expression. The expression must have |
13248 | // an interface type, but the actual type conversion is checked at run | |
13249 | // time. | |
13250 | ||
13251 | void | |
13252 | Type_guard_expression::do_check_types(Gogo*) | |
13253 | { | |
e440a328 | 13254 | Type* expr_type = this->expr_->type(); |
7e9da23f | 13255 | if (expr_type->interface_type() == NULL) |
f725ade8 | 13256 | { |
5c13bd80 | 13257 | if (!expr_type->is_error() && !this->type_->is_error()) |
f725ade8 | 13258 | this->report_error(_("type assertion only valid for interface types")); |
13259 | this->set_is_error(); | |
13260 | } | |
e440a328 | 13261 | else if (this->type_->interface_type() == NULL) |
13262 | { | |
13263 | std::string reason; | |
13264 | if (!expr_type->interface_type()->implements_interface(this->type_, | |
13265 | &reason)) | |
13266 | { | |
5c13bd80 | 13267 | if (!this->type_->is_error()) |
e440a328 | 13268 | { |
f725ade8 | 13269 | if (reason.empty()) |
13270 | this->report_error(_("impossible type assertion: " | |
13271 | "type does not implement interface")); | |
13272 | else | |
13273 | error_at(this->location(), | |
13274 | ("impossible type assertion: " | |
13275 | "type does not implement interface (%s)"), | |
13276 | reason.c_str()); | |
e440a328 | 13277 | } |
f725ade8 | 13278 | this->set_is_error(); |
e440a328 | 13279 | } |
13280 | } | |
13281 | } | |
13282 | ||
ea664253 | 13283 | // Return the backend representation for a type guard expression. |
e440a328 | 13284 | |
ea664253 | 13285 | Bexpression* |
13286 | Type_guard_expression::do_get_backend(Translate_context* context) | |
e440a328 | 13287 | { |
2c809f8f | 13288 | Expression* conversion; |
7e9da23f | 13289 | if (this->type_->interface_type() != NULL) |
2c809f8f | 13290 | conversion = |
13291 | Expression::convert_interface_to_interface(this->type_, this->expr_, | |
13292 | true, this->location()); | |
e440a328 | 13293 | else |
2c809f8f | 13294 | conversion = |
13295 | Expression::convert_for_assignment(context->gogo(), this->type_, | |
13296 | this->expr_, this->location()); | |
13297 | ||
ea664253 | 13298 | return conversion->get_backend(context); |
e440a328 | 13299 | } |
13300 | ||
d751bb78 | 13301 | // Dump ast representation for a type guard expression. |
13302 | ||
13303 | void | |
2c809f8f | 13304 | Type_guard_expression::do_dump_expression(Ast_dump_context* ast_dump_context) |
d751bb78 | 13305 | const |
13306 | { | |
13307 | this->expr_->dump_expression(ast_dump_context); | |
13308 | ast_dump_context->ostream() << "."; | |
13309 | ast_dump_context->dump_type(this->type_); | |
13310 | } | |
13311 | ||
e440a328 | 13312 | // Make a type guard expression. |
13313 | ||
13314 | Expression* | |
13315 | Expression::make_type_guard(Expression* expr, Type* type, | |
b13c66cd | 13316 | Location location) |
e440a328 | 13317 | { |
13318 | return new Type_guard_expression(expr, type, location); | |
13319 | } | |
13320 | ||
2c809f8f | 13321 | // Class Heap_expression. |
e440a328 | 13322 | |
da244e59 | 13323 | // Return the type of the expression stored on the heap. |
e440a328 | 13324 | |
da244e59 | 13325 | Type* |
13326 | Heap_expression::do_type() | |
13327 | { return Type::make_pointer_type(this->expr_->type()); } | |
e440a328 | 13328 | |
ea664253 | 13329 | // Return the backend representation for allocating an expression on the heap. |
e440a328 | 13330 | |
ea664253 | 13331 | Bexpression* |
13332 | Heap_expression::do_get_backend(Translate_context* context) | |
e440a328 | 13333 | { |
02c19a1a | 13334 | if (this->expr_->is_error_expression() || this->expr_->type()->is_error()) |
ea664253 | 13335 | return context->backend()->error_expression(); |
2c809f8f | 13336 | |
02c19a1a | 13337 | Location loc = this->location(); |
2c809f8f | 13338 | Gogo* gogo = context->gogo(); |
02c19a1a | 13339 | Btype* btype = this->type()->get_backend(gogo); |
ea664253 | 13340 | Bexpression* space = Expression::make_allocation(this->expr_->type(), |
13341 | loc)->get_backend(context); | |
02c19a1a | 13342 | |
13343 | Bstatement* decl; | |
13344 | Named_object* fn = context->function(); | |
13345 | go_assert(fn != NULL); | |
13346 | Bfunction* fndecl = fn->func_value()->get_or_make_decl(gogo, fn); | |
13347 | Bvariable* space_temp = | |
13348 | gogo->backend()->temporary_variable(fndecl, context->bblock(), btype, | |
13349 | space, true, loc, &decl); | |
13350 | space = gogo->backend()->var_expression(space_temp, loc); | |
9b27b43c | 13351 | Btype* expr_btype = this->expr_->type()->get_backend(gogo); |
13352 | Bexpression* ref = | |
13353 | gogo->backend()->indirect_expression(expr_btype, space, true, loc); | |
02c19a1a | 13354 | |
ea664253 | 13355 | Bexpression* bexpr = this->expr_->get_backend(context); |
02c19a1a | 13356 | Bstatement* assn = gogo->backend()->assignment_statement(ref, bexpr, loc); |
13357 | decl = gogo->backend()->compound_statement(decl, assn); | |
13358 | space = gogo->backend()->var_expression(space_temp, loc); | |
ea664253 | 13359 | return gogo->backend()->compound_expression(decl, space, loc); |
e440a328 | 13360 | } |
13361 | ||
2c809f8f | 13362 | // Dump ast representation for a heap expression. |
d751bb78 | 13363 | |
13364 | void | |
2c809f8f | 13365 | Heap_expression::do_dump_expression( |
d751bb78 | 13366 | Ast_dump_context* ast_dump_context) const |
13367 | { | |
13368 | ast_dump_context->ostream() << "&("; | |
13369 | ast_dump_context->dump_expression(this->expr_); | |
13370 | ast_dump_context->ostream() << ")"; | |
13371 | } | |
13372 | ||
2c809f8f | 13373 | // Allocate an expression on the heap. |
e440a328 | 13374 | |
13375 | Expression* | |
2c809f8f | 13376 | Expression::make_heap_expression(Expression* expr, Location location) |
e440a328 | 13377 | { |
2c809f8f | 13378 | return new Heap_expression(expr, location); |
e440a328 | 13379 | } |
13380 | ||
13381 | // Class Receive_expression. | |
13382 | ||
13383 | // Return the type of a receive expression. | |
13384 | ||
13385 | Type* | |
13386 | Receive_expression::do_type() | |
13387 | { | |
13388 | Channel_type* channel_type = this->channel_->type()->channel_type(); | |
13389 | if (channel_type == NULL) | |
13390 | return Type::make_error_type(); | |
13391 | return channel_type->element_type(); | |
13392 | } | |
13393 | ||
13394 | // Check types for a receive expression. | |
13395 | ||
13396 | void | |
13397 | Receive_expression::do_check_types(Gogo*) | |
13398 | { | |
13399 | Type* type = this->channel_->type(); | |
5c13bd80 | 13400 | if (type->is_error()) |
e440a328 | 13401 | { |
13402 | this->set_is_error(); | |
13403 | return; | |
13404 | } | |
13405 | if (type->channel_type() == NULL) | |
13406 | { | |
13407 | this->report_error(_("expected channel")); | |
13408 | return; | |
13409 | } | |
13410 | if (!type->channel_type()->may_receive()) | |
13411 | { | |
13412 | this->report_error(_("invalid receive on send-only channel")); | |
13413 | return; | |
13414 | } | |
13415 | } | |
13416 | ||
2c809f8f | 13417 | // Flattening for receive expressions creates a temporary variable to store |
13418 | // received data in for receives. | |
13419 | ||
13420 | Expression* | |
13421 | Receive_expression::do_flatten(Gogo*, Named_object*, | |
13422 | Statement_inserter* inserter) | |
13423 | { | |
13424 | Channel_type* channel_type = this->channel_->type()->channel_type(); | |
13425 | if (channel_type == NULL) | |
13426 | { | |
13427 | go_assert(saw_errors()); | |
13428 | return this; | |
13429 | } | |
5bf8be8b | 13430 | else if (this->channel_->is_error_expression()) |
13431 | { | |
13432 | go_assert(saw_errors()); | |
13433 | return Expression::make_error(this->location()); | |
13434 | } | |
2c809f8f | 13435 | |
13436 | Type* element_type = channel_type->element_type(); | |
13437 | if (this->temp_receiver_ == NULL) | |
13438 | { | |
13439 | this->temp_receiver_ = Statement::make_temporary(element_type, NULL, | |
13440 | this->location()); | |
13441 | this->temp_receiver_->set_is_address_taken(); | |
13442 | inserter->insert(this->temp_receiver_); | |
13443 | } | |
13444 | ||
13445 | return this; | |
13446 | } | |
13447 | ||
ea664253 | 13448 | // Get the backend representation for a receive expression. |
e440a328 | 13449 | |
ea664253 | 13450 | Bexpression* |
13451 | Receive_expression::do_get_backend(Translate_context* context) | |
e440a328 | 13452 | { |
f24f10bb | 13453 | Location loc = this->location(); |
13454 | ||
e440a328 | 13455 | Channel_type* channel_type = this->channel_->type()->channel_type(); |
5b8368f4 | 13456 | if (channel_type == NULL) |
13457 | { | |
c484d925 | 13458 | go_assert(this->channel_->type()->is_error()); |
ea664253 | 13459 | return context->backend()->error_expression(); |
5b8368f4 | 13460 | } |
f24f10bb | 13461 | Expression* td = Expression::make_type_descriptor(channel_type, loc); |
e440a328 | 13462 | |
2c809f8f | 13463 | Expression* recv_ref = |
13464 | Expression::make_temporary_reference(this->temp_receiver_, loc); | |
13465 | Expression* recv_addr = | |
13466 | Expression::make_temporary_reference(this->temp_receiver_, loc); | |
13467 | recv_addr = Expression::make_unary(OPERATOR_AND, recv_addr, loc); | |
13468 | Expression* recv = | |
13469 | Runtime::make_call(Runtime::RECEIVE, loc, 3, | |
13470 | td, this->channel_, recv_addr); | |
ea664253 | 13471 | return Expression::make_compound(recv, recv_ref, loc)->get_backend(context); |
e440a328 | 13472 | } |
13473 | ||
d751bb78 | 13474 | // Dump ast representation for a receive expression. |
13475 | ||
13476 | void | |
13477 | Receive_expression::do_dump_expression(Ast_dump_context* ast_dump_context) const | |
13478 | { | |
13479 | ast_dump_context->ostream() << " <- " ; | |
13480 | ast_dump_context->dump_expression(channel_); | |
13481 | } | |
13482 | ||
e440a328 | 13483 | // Make a receive expression. |
13484 | ||
13485 | Receive_expression* | |
b13c66cd | 13486 | Expression::make_receive(Expression* channel, Location location) |
e440a328 | 13487 | { |
13488 | return new Receive_expression(channel, location); | |
13489 | } | |
13490 | ||
e440a328 | 13491 | // An expression which evaluates to a pointer to the type descriptor |
13492 | // of a type. | |
13493 | ||
13494 | class Type_descriptor_expression : public Expression | |
13495 | { | |
13496 | public: | |
b13c66cd | 13497 | Type_descriptor_expression(Type* type, Location location) |
e440a328 | 13498 | : Expression(EXPRESSION_TYPE_DESCRIPTOR, location), |
13499 | type_(type) | |
13500 | { } | |
13501 | ||
13502 | protected: | |
4b686186 | 13503 | int |
13504 | do_traverse(Traverse*); | |
13505 | ||
e440a328 | 13506 | Type* |
13507 | do_type() | |
13508 | { return Type::make_type_descriptor_ptr_type(); } | |
13509 | ||
f9ca30f9 | 13510 | bool |
13511 | do_is_immutable() const | |
13512 | { return true; } | |
13513 | ||
e440a328 | 13514 | void |
13515 | do_determine_type(const Type_context*) | |
13516 | { } | |
13517 | ||
13518 | Expression* | |
13519 | do_copy() | |
13520 | { return this; } | |
13521 | ||
ea664253 | 13522 | Bexpression* |
13523 | do_get_backend(Translate_context* context) | |
a1d23b41 | 13524 | { |
ea664253 | 13525 | return this->type_->type_descriptor_pointer(context->gogo(), |
13526 | this->location()); | |
a1d23b41 | 13527 | } |
e440a328 | 13528 | |
d751bb78 | 13529 | void |
13530 | do_dump_expression(Ast_dump_context*) const; | |
13531 | ||
e440a328 | 13532 | private: |
13533 | // The type for which this is the descriptor. | |
13534 | Type* type_; | |
13535 | }; | |
13536 | ||
4b686186 | 13537 | int |
13538 | Type_descriptor_expression::do_traverse(Traverse* traverse) | |
13539 | { | |
13540 | if (Type::traverse(this->type_, traverse) == TRAVERSE_EXIT) | |
13541 | return TRAVERSE_EXIT; | |
13542 | return TRAVERSE_CONTINUE; | |
13543 | } | |
13544 | ||
d751bb78 | 13545 | // Dump ast representation for a type descriptor expression. |
13546 | ||
13547 | void | |
13548 | Type_descriptor_expression::do_dump_expression( | |
13549 | Ast_dump_context* ast_dump_context) const | |
13550 | { | |
13551 | ast_dump_context->dump_type(this->type_); | |
13552 | } | |
13553 | ||
e440a328 | 13554 | // Make a type descriptor expression. |
13555 | ||
13556 | Expression* | |
b13c66cd | 13557 | Expression::make_type_descriptor(Type* type, Location location) |
e440a328 | 13558 | { |
13559 | return new Type_descriptor_expression(type, location); | |
13560 | } | |
13561 | ||
aa5ae575 | 13562 | // An expression which evaluates to a pointer to the Garbage Collection symbol |
13563 | // of a type. | |
13564 | ||
13565 | class GC_symbol_expression : public Expression | |
13566 | { | |
13567 | public: | |
13568 | GC_symbol_expression(Type* type) | |
13569 | : Expression(EXPRESSION_GC_SYMBOL, Linemap::predeclared_location()), | |
13570 | type_(type) | |
13571 | {} | |
13572 | ||
13573 | protected: | |
13574 | Type* | |
13575 | do_type() | |
23d77f91 | 13576 | { return Type::lookup_integer_type("uintptr"); } |
aa5ae575 | 13577 | |
13578 | bool | |
13579 | do_is_immutable() const | |
13580 | { return true; } | |
13581 | ||
13582 | void | |
13583 | do_determine_type(const Type_context*) | |
13584 | { } | |
13585 | ||
13586 | Expression* | |
13587 | do_copy() | |
13588 | { return this; } | |
13589 | ||
13590 | Bexpression* | |
13591 | do_get_backend(Translate_context* context) | |
13592 | { return this->type_->gc_symbol_pointer(context->gogo()); } | |
13593 | ||
13594 | void | |
13595 | do_dump_expression(Ast_dump_context*) const; | |
13596 | ||
13597 | private: | |
13598 | // The type which this gc symbol describes. | |
13599 | Type* type_; | |
13600 | }; | |
13601 | ||
13602 | // Dump ast representation for a gc symbol expression. | |
13603 | ||
13604 | void | |
13605 | GC_symbol_expression::do_dump_expression( | |
13606 | Ast_dump_context* ast_dump_context) const | |
13607 | { | |
13608 | ast_dump_context->ostream() << "gcdata("; | |
13609 | ast_dump_context->dump_type(this->type_); | |
13610 | ast_dump_context->ostream() << ")"; | |
13611 | } | |
13612 | ||
13613 | // Make a gc symbol expression. | |
13614 | ||
13615 | Expression* | |
13616 | Expression::make_gc_symbol(Type* type) | |
13617 | { | |
13618 | return new GC_symbol_expression(type); | |
13619 | } | |
13620 | ||
e440a328 | 13621 | // An expression which evaluates to some characteristic of a type. |
13622 | // This is only used to initialize fields of a type descriptor. Using | |
13623 | // a new expression class is slightly inefficient but gives us a good | |
13624 | // separation between the frontend and the middle-end with regard to | |
13625 | // how types are laid out. | |
13626 | ||
13627 | class Type_info_expression : public Expression | |
13628 | { | |
13629 | public: | |
13630 | Type_info_expression(Type* type, Type_info type_info) | |
b13c66cd | 13631 | : Expression(EXPRESSION_TYPE_INFO, Linemap::predeclared_location()), |
e440a328 | 13632 | type_(type), type_info_(type_info) |
13633 | { } | |
13634 | ||
13635 | protected: | |
0e168074 | 13636 | bool |
13637 | do_is_immutable() const | |
13638 | { return true; } | |
13639 | ||
e440a328 | 13640 | Type* |
13641 | do_type(); | |
13642 | ||
13643 | void | |
13644 | do_determine_type(const Type_context*) | |
13645 | { } | |
13646 | ||
13647 | Expression* | |
13648 | do_copy() | |
13649 | { return this; } | |
13650 | ||
ea664253 | 13651 | Bexpression* |
13652 | do_get_backend(Translate_context* context); | |
e440a328 | 13653 | |
d751bb78 | 13654 | void |
13655 | do_dump_expression(Ast_dump_context*) const; | |
13656 | ||
e440a328 | 13657 | private: |
13658 | // The type for which we are getting information. | |
13659 | Type* type_; | |
13660 | // What information we want. | |
13661 | Type_info type_info_; | |
13662 | }; | |
13663 | ||
13664 | // The type is chosen to match what the type descriptor struct | |
13665 | // expects. | |
13666 | ||
13667 | Type* | |
13668 | Type_info_expression::do_type() | |
13669 | { | |
13670 | switch (this->type_info_) | |
13671 | { | |
13672 | case TYPE_INFO_SIZE: | |
13673 | return Type::lookup_integer_type("uintptr"); | |
13674 | case TYPE_INFO_ALIGNMENT: | |
13675 | case TYPE_INFO_FIELD_ALIGNMENT: | |
13676 | return Type::lookup_integer_type("uint8"); | |
13677 | default: | |
c3e6f413 | 13678 | go_unreachable(); |
e440a328 | 13679 | } |
13680 | } | |
13681 | ||
ea664253 | 13682 | // Return the backend representation for type information. |
e440a328 | 13683 | |
ea664253 | 13684 | Bexpression* |
13685 | Type_info_expression::do_get_backend(Translate_context* context) | |
e440a328 | 13686 | { |
927a01eb | 13687 | Btype* btype = this->type_->get_backend(context->gogo()); |
13688 | Gogo* gogo = context->gogo(); | |
3f378015 | 13689 | int64_t val; |
927a01eb | 13690 | switch (this->type_info_) |
e440a328 | 13691 | { |
927a01eb | 13692 | case TYPE_INFO_SIZE: |
13693 | val = gogo->backend()->type_size(btype); | |
13694 | break; | |
13695 | case TYPE_INFO_ALIGNMENT: | |
13696 | val = gogo->backend()->type_alignment(btype); | |
13697 | break; | |
13698 | case TYPE_INFO_FIELD_ALIGNMENT: | |
13699 | val = gogo->backend()->type_field_alignment(btype); | |
13700 | break; | |
13701 | default: | |
13702 | go_unreachable(); | |
e440a328 | 13703 | } |
3f378015 | 13704 | Expression* e = Expression::make_integer_int64(val, this->type(), |
13705 | this->location()); | |
13706 | return e->get_backend(context); | |
e440a328 | 13707 | } |
13708 | ||
d751bb78 | 13709 | // Dump ast representation for a type info expression. |
13710 | ||
13711 | void | |
13712 | Type_info_expression::do_dump_expression( | |
13713 | Ast_dump_context* ast_dump_context) const | |
13714 | { | |
13715 | ast_dump_context->ostream() << "typeinfo("; | |
13716 | ast_dump_context->dump_type(this->type_); | |
13717 | ast_dump_context->ostream() << ","; | |
13718 | ast_dump_context->ostream() << | |
13719 | (this->type_info_ == TYPE_INFO_ALIGNMENT ? "alignment" | |
13720 | : this->type_info_ == TYPE_INFO_FIELD_ALIGNMENT ? "field alignment" | |
13721 | : this->type_info_ == TYPE_INFO_SIZE ? "size " | |
13722 | : "unknown"); | |
13723 | ast_dump_context->ostream() << ")"; | |
13724 | } | |
13725 | ||
e440a328 | 13726 | // Make a type info expression. |
13727 | ||
13728 | Expression* | |
13729 | Expression::make_type_info(Type* type, Type_info type_info) | |
13730 | { | |
13731 | return new Type_info_expression(type, type_info); | |
13732 | } | |
13733 | ||
35a54f17 | 13734 | // An expression that evaluates to some characteristic of a slice. |
13735 | // This is used when indexing, bound-checking, or nil checking a slice. | |
13736 | ||
13737 | class Slice_info_expression : public Expression | |
13738 | { | |
13739 | public: | |
13740 | Slice_info_expression(Expression* slice, Slice_info slice_info, | |
13741 | Location location) | |
13742 | : Expression(EXPRESSION_SLICE_INFO, location), | |
13743 | slice_(slice), slice_info_(slice_info) | |
13744 | { } | |
13745 | ||
13746 | protected: | |
13747 | Type* | |
13748 | do_type(); | |
13749 | ||
13750 | void | |
13751 | do_determine_type(const Type_context*) | |
13752 | { } | |
13753 | ||
13754 | Expression* | |
13755 | do_copy() | |
13756 | { | |
13757 | return new Slice_info_expression(this->slice_->copy(), this->slice_info_, | |
13758 | this->location()); | |
13759 | } | |
13760 | ||
ea664253 | 13761 | Bexpression* |
13762 | do_get_backend(Translate_context* context); | |
35a54f17 | 13763 | |
13764 | void | |
13765 | do_dump_expression(Ast_dump_context*) const; | |
13766 | ||
13767 | void | |
13768 | do_issue_nil_check() | |
13769 | { this->slice_->issue_nil_check(); } | |
13770 | ||
13771 | private: | |
13772 | // The slice for which we are getting information. | |
13773 | Expression* slice_; | |
13774 | // What information we want. | |
13775 | Slice_info slice_info_; | |
13776 | }; | |
13777 | ||
13778 | // Return the type of the slice info. | |
13779 | ||
13780 | Type* | |
13781 | Slice_info_expression::do_type() | |
13782 | { | |
13783 | switch (this->slice_info_) | |
13784 | { | |
13785 | case SLICE_INFO_VALUE_POINTER: | |
13786 | return Type::make_pointer_type( | |
13787 | this->slice_->type()->array_type()->element_type()); | |
13788 | case SLICE_INFO_LENGTH: | |
13789 | case SLICE_INFO_CAPACITY: | |
13790 | return Type::lookup_integer_type("int"); | |
13791 | default: | |
13792 | go_unreachable(); | |
13793 | } | |
13794 | } | |
13795 | ||
ea664253 | 13796 | // Return the backend information for slice information. |
35a54f17 | 13797 | |
ea664253 | 13798 | Bexpression* |
13799 | Slice_info_expression::do_get_backend(Translate_context* context) | |
35a54f17 | 13800 | { |
13801 | Gogo* gogo = context->gogo(); | |
ea664253 | 13802 | Bexpression* bslice = this->slice_->get_backend(context); |
35a54f17 | 13803 | switch (this->slice_info_) |
13804 | { | |
13805 | case SLICE_INFO_VALUE_POINTER: | |
13806 | case SLICE_INFO_LENGTH: | |
13807 | case SLICE_INFO_CAPACITY: | |
ea664253 | 13808 | return gogo->backend()->struct_field_expression(bslice, this->slice_info_, |
13809 | this->location()); | |
35a54f17 | 13810 | break; |
13811 | default: | |
13812 | go_unreachable(); | |
13813 | } | |
35a54f17 | 13814 | } |
13815 | ||
13816 | // Dump ast representation for a type info expression. | |
13817 | ||
13818 | void | |
13819 | Slice_info_expression::do_dump_expression( | |
13820 | Ast_dump_context* ast_dump_context) const | |
13821 | { | |
13822 | ast_dump_context->ostream() << "sliceinfo("; | |
13823 | this->slice_->dump_expression(ast_dump_context); | |
13824 | ast_dump_context->ostream() << ","; | |
13825 | ast_dump_context->ostream() << | |
13826 | (this->slice_info_ == SLICE_INFO_VALUE_POINTER ? "values" | |
13827 | : this->slice_info_ == SLICE_INFO_LENGTH ? "length" | |
13828 | : this->slice_info_ == SLICE_INFO_CAPACITY ? "capacity " | |
13829 | : "unknown"); | |
13830 | ast_dump_context->ostream() << ")"; | |
13831 | } | |
13832 | ||
13833 | // Make a slice info expression. | |
13834 | ||
13835 | Expression* | |
13836 | Expression::make_slice_info(Expression* slice, Slice_info slice_info, | |
13837 | Location location) | |
13838 | { | |
13839 | return new Slice_info_expression(slice, slice_info, location); | |
13840 | } | |
13841 | ||
2c809f8f | 13842 | // An expression that represents a slice value: a struct with value pointer, |
13843 | // length, and capacity fields. | |
13844 | ||
13845 | class Slice_value_expression : public Expression | |
13846 | { | |
13847 | public: | |
13848 | Slice_value_expression(Type* type, Expression* valptr, Expression* len, | |
13849 | Expression* cap, Location location) | |
13850 | : Expression(EXPRESSION_SLICE_VALUE, location), | |
13851 | type_(type), valptr_(valptr), len_(len), cap_(cap) | |
13852 | { } | |
13853 | ||
13854 | protected: | |
13855 | int | |
13856 | do_traverse(Traverse*); | |
13857 | ||
13858 | Type* | |
13859 | do_type() | |
13860 | { return this->type_; } | |
13861 | ||
13862 | void | |
13863 | do_determine_type(const Type_context*) | |
13864 | { go_unreachable(); } | |
13865 | ||
13866 | Expression* | |
13867 | do_copy() | |
13868 | { | |
13869 | return new Slice_value_expression(this->type_, this->valptr_->copy(), | |
13870 | this->len_->copy(), this->cap_->copy(), | |
13871 | this->location()); | |
13872 | } | |
13873 | ||
ea664253 | 13874 | Bexpression* |
13875 | do_get_backend(Translate_context* context); | |
2c809f8f | 13876 | |
13877 | void | |
13878 | do_dump_expression(Ast_dump_context*) const; | |
13879 | ||
13880 | private: | |
13881 | // The type of the slice value. | |
13882 | Type* type_; | |
13883 | // The pointer to the values in the slice. | |
13884 | Expression* valptr_; | |
13885 | // The length of the slice. | |
13886 | Expression* len_; | |
13887 | // The capacity of the slice. | |
13888 | Expression* cap_; | |
13889 | }; | |
13890 | ||
13891 | int | |
13892 | Slice_value_expression::do_traverse(Traverse* traverse) | |
13893 | { | |
55e8ba6a | 13894 | if (Type::traverse(this->type_, traverse) == TRAVERSE_EXIT |
13895 | || Expression::traverse(&this->valptr_, traverse) == TRAVERSE_EXIT | |
2c809f8f | 13896 | || Expression::traverse(&this->len_, traverse) == TRAVERSE_EXIT |
13897 | || Expression::traverse(&this->cap_, traverse) == TRAVERSE_EXIT) | |
13898 | return TRAVERSE_EXIT; | |
13899 | return TRAVERSE_CONTINUE; | |
13900 | } | |
13901 | ||
ea664253 | 13902 | Bexpression* |
13903 | Slice_value_expression::do_get_backend(Translate_context* context) | |
2c809f8f | 13904 | { |
13905 | std::vector<Bexpression*> vals(3); | |
ea664253 | 13906 | vals[0] = this->valptr_->get_backend(context); |
13907 | vals[1] = this->len_->get_backend(context); | |
13908 | vals[2] = this->cap_->get_backend(context); | |
2c809f8f | 13909 | |
13910 | Gogo* gogo = context->gogo(); | |
13911 | Btype* btype = this->type_->get_backend(gogo); | |
ea664253 | 13912 | return gogo->backend()->constructor_expression(btype, vals, this->location()); |
2c809f8f | 13913 | } |
13914 | ||
13915 | void | |
13916 | Slice_value_expression::do_dump_expression( | |
13917 | Ast_dump_context* ast_dump_context) const | |
13918 | { | |
13919 | ast_dump_context->ostream() << "slicevalue("; | |
13920 | ast_dump_context->ostream() << "values: "; | |
13921 | this->valptr_->dump_expression(ast_dump_context); | |
13922 | ast_dump_context->ostream() << ", length: "; | |
13923 | this->len_->dump_expression(ast_dump_context); | |
13924 | ast_dump_context->ostream() << ", capacity: "; | |
13925 | this->cap_->dump_expression(ast_dump_context); | |
13926 | ast_dump_context->ostream() << ")"; | |
13927 | } | |
13928 | ||
13929 | Expression* | |
13930 | Expression::make_slice_value(Type* at, Expression* valptr, Expression* len, | |
13931 | Expression* cap, Location location) | |
13932 | { | |
13933 | go_assert(at->is_slice_type()); | |
13934 | return new Slice_value_expression(at, valptr, len, cap, location); | |
13935 | } | |
2387f644 | 13936 | |
13937 | // An expression that evaluates to some characteristic of a non-empty interface. | |
13938 | // This is used to access the method table or underlying object of an interface. | |
13939 | ||
13940 | class Interface_info_expression : public Expression | |
13941 | { | |
13942 | public: | |
13943 | Interface_info_expression(Expression* iface, Interface_info iface_info, | |
2c809f8f | 13944 | Location location) |
2387f644 | 13945 | : Expression(EXPRESSION_INTERFACE_INFO, location), |
13946 | iface_(iface), iface_info_(iface_info) | |
13947 | { } | |
13948 | ||
13949 | protected: | |
13950 | Type* | |
13951 | do_type(); | |
13952 | ||
13953 | void | |
13954 | do_determine_type(const Type_context*) | |
13955 | { } | |
13956 | ||
13957 | Expression* | |
13958 | do_copy() | |
13959 | { | |
13960 | return new Interface_info_expression(this->iface_->copy(), | |
13961 | this->iface_info_, this->location()); | |
13962 | } | |
13963 | ||
ea664253 | 13964 | Bexpression* |
13965 | do_get_backend(Translate_context* context); | |
2387f644 | 13966 | |
13967 | void | |
13968 | do_dump_expression(Ast_dump_context*) const; | |
13969 | ||
13970 | void | |
13971 | do_issue_nil_check() | |
13972 | { this->iface_->issue_nil_check(); } | |
13973 | ||
13974 | private: | |
13975 | // The interface for which we are getting information. | |
13976 | Expression* iface_; | |
13977 | // What information we want. | |
13978 | Interface_info iface_info_; | |
13979 | }; | |
13980 | ||
13981 | // Return the type of the interface info. | |
13982 | ||
13983 | Type* | |
13984 | Interface_info_expression::do_type() | |
13985 | { | |
13986 | switch (this->iface_info_) | |
13987 | { | |
13988 | case INTERFACE_INFO_METHODS: | |
13989 | { | |
2c809f8f | 13990 | Type* pdt = Type::make_type_descriptor_ptr_type(); |
13991 | if (this->iface_->type()->interface_type()->is_empty()) | |
13992 | return pdt; | |
13993 | ||
2387f644 | 13994 | Location loc = this->location(); |
13995 | Struct_field_list* sfl = new Struct_field_list(); | |
2387f644 | 13996 | sfl->push_back( |
13997 | Struct_field(Typed_identifier("__type_descriptor", pdt, loc))); | |
13998 | ||
13999 | Interface_type* itype = this->iface_->type()->interface_type(); | |
14000 | for (Typed_identifier_list::const_iterator p = itype->methods()->begin(); | |
14001 | p != itype->methods()->end(); | |
14002 | ++p) | |
14003 | { | |
14004 | Function_type* ft = p->type()->function_type(); | |
14005 | go_assert(ft->receiver() == NULL); | |
14006 | ||
14007 | const Typed_identifier_list* params = ft->parameters(); | |
14008 | Typed_identifier_list* mparams = new Typed_identifier_list(); | |
14009 | if (params != NULL) | |
14010 | mparams->reserve(params->size() + 1); | |
14011 | Type* vt = Type::make_pointer_type(Type::make_void_type()); | |
14012 | mparams->push_back(Typed_identifier("", vt, ft->location())); | |
14013 | if (params != NULL) | |
14014 | { | |
14015 | for (Typed_identifier_list::const_iterator pp = params->begin(); | |
14016 | pp != params->end(); | |
14017 | ++pp) | |
14018 | mparams->push_back(*pp); | |
14019 | } | |
14020 | ||
14021 | Typed_identifier_list* mresults = (ft->results() == NULL | |
14022 | ? NULL | |
14023 | : ft->results()->copy()); | |
14024 | Backend_function_type* mft = | |
14025 | Type::make_backend_function_type(NULL, mparams, mresults, | |
14026 | ft->location()); | |
14027 | ||
14028 | std::string fname = Gogo::unpack_hidden_name(p->name()); | |
14029 | sfl->push_back(Struct_field(Typed_identifier(fname, mft, loc))); | |
14030 | } | |
14031 | ||
14032 | return Type::make_pointer_type(Type::make_struct_type(sfl, loc)); | |
14033 | } | |
14034 | case INTERFACE_INFO_OBJECT: | |
14035 | return Type::make_pointer_type(Type::make_void_type()); | |
14036 | default: | |
14037 | go_unreachable(); | |
14038 | } | |
14039 | } | |
14040 | ||
ea664253 | 14041 | // Return the backend representation for interface information. |
2387f644 | 14042 | |
ea664253 | 14043 | Bexpression* |
14044 | Interface_info_expression::do_get_backend(Translate_context* context) | |
2387f644 | 14045 | { |
14046 | Gogo* gogo = context->gogo(); | |
ea664253 | 14047 | Bexpression* biface = this->iface_->get_backend(context); |
2387f644 | 14048 | switch (this->iface_info_) |
14049 | { | |
14050 | case INTERFACE_INFO_METHODS: | |
14051 | case INTERFACE_INFO_OBJECT: | |
ea664253 | 14052 | return gogo->backend()->struct_field_expression(biface, this->iface_info_, |
14053 | this->location()); | |
2387f644 | 14054 | break; |
14055 | default: | |
14056 | go_unreachable(); | |
14057 | } | |
2387f644 | 14058 | } |
14059 | ||
14060 | // Dump ast representation for an interface info expression. | |
14061 | ||
14062 | void | |
14063 | Interface_info_expression::do_dump_expression( | |
14064 | Ast_dump_context* ast_dump_context) const | |
14065 | { | |
2c809f8f | 14066 | bool is_empty = this->iface_->type()->interface_type()->is_empty(); |
2387f644 | 14067 | ast_dump_context->ostream() << "interfaceinfo("; |
14068 | this->iface_->dump_expression(ast_dump_context); | |
14069 | ast_dump_context->ostream() << ","; | |
14070 | ast_dump_context->ostream() << | |
2c809f8f | 14071 | (this->iface_info_ == INTERFACE_INFO_METHODS && !is_empty ? "methods" |
14072 | : this->iface_info_ == INTERFACE_INFO_TYPE_DESCRIPTOR ? "type_descriptor" | |
2387f644 | 14073 | : this->iface_info_ == INTERFACE_INFO_OBJECT ? "object" |
14074 | : "unknown"); | |
14075 | ast_dump_context->ostream() << ")"; | |
14076 | } | |
14077 | ||
14078 | // Make an interface info expression. | |
14079 | ||
14080 | Expression* | |
14081 | Expression::make_interface_info(Expression* iface, Interface_info iface_info, | |
14082 | Location location) | |
14083 | { | |
14084 | return new Interface_info_expression(iface, iface_info, location); | |
14085 | } | |
14086 | ||
2c809f8f | 14087 | // An expression that represents an interface value. The first field is either |
14088 | // a type descriptor for an empty interface or a pointer to the interface method | |
14089 | // table for a non-empty interface. The second field is always the object. | |
14090 | ||
14091 | class Interface_value_expression : public Expression | |
14092 | { | |
14093 | public: | |
14094 | Interface_value_expression(Type* type, Expression* first_field, | |
14095 | Expression* obj, Location location) | |
14096 | : Expression(EXPRESSION_INTERFACE_VALUE, location), | |
14097 | type_(type), first_field_(first_field), obj_(obj) | |
14098 | { } | |
14099 | ||
14100 | protected: | |
14101 | int | |
14102 | do_traverse(Traverse*); | |
14103 | ||
14104 | Type* | |
14105 | do_type() | |
14106 | { return this->type_; } | |
14107 | ||
14108 | void | |
14109 | do_determine_type(const Type_context*) | |
14110 | { go_unreachable(); } | |
14111 | ||
14112 | Expression* | |
14113 | do_copy() | |
14114 | { | |
14115 | return new Interface_value_expression(this->type_, | |
14116 | this->first_field_->copy(), | |
14117 | this->obj_->copy(), this->location()); | |
14118 | } | |
14119 | ||
ea664253 | 14120 | Bexpression* |
14121 | do_get_backend(Translate_context* context); | |
2c809f8f | 14122 | |
14123 | void | |
14124 | do_dump_expression(Ast_dump_context*) const; | |
14125 | ||
14126 | private: | |
14127 | // The type of the interface value. | |
14128 | Type* type_; | |
14129 | // The first field of the interface (either a type descriptor or a pointer | |
14130 | // to the method table. | |
14131 | Expression* first_field_; | |
14132 | // The underlying object of the interface. | |
14133 | Expression* obj_; | |
14134 | }; | |
14135 | ||
14136 | int | |
14137 | Interface_value_expression::do_traverse(Traverse* traverse) | |
14138 | { | |
14139 | if (Expression::traverse(&this->first_field_, traverse) == TRAVERSE_EXIT | |
14140 | || Expression::traverse(&this->obj_, traverse) == TRAVERSE_EXIT) | |
14141 | return TRAVERSE_EXIT; | |
14142 | return TRAVERSE_CONTINUE; | |
14143 | } | |
14144 | ||
ea664253 | 14145 | Bexpression* |
14146 | Interface_value_expression::do_get_backend(Translate_context* context) | |
2c809f8f | 14147 | { |
14148 | std::vector<Bexpression*> vals(2); | |
ea664253 | 14149 | vals[0] = this->first_field_->get_backend(context); |
14150 | vals[1] = this->obj_->get_backend(context); | |
2c809f8f | 14151 | |
14152 | Gogo* gogo = context->gogo(); | |
14153 | Btype* btype = this->type_->get_backend(gogo); | |
ea664253 | 14154 | return gogo->backend()->constructor_expression(btype, vals, this->location()); |
2c809f8f | 14155 | } |
14156 | ||
14157 | void | |
14158 | Interface_value_expression::do_dump_expression( | |
14159 | Ast_dump_context* ast_dump_context) const | |
14160 | { | |
14161 | ast_dump_context->ostream() << "interfacevalue("; | |
14162 | ast_dump_context->ostream() << | |
14163 | (this->type_->interface_type()->is_empty() | |
14164 | ? "type_descriptor: " | |
14165 | : "methods: "); | |
14166 | this->first_field_->dump_expression(ast_dump_context); | |
14167 | ast_dump_context->ostream() << ", object: "; | |
14168 | this->obj_->dump_expression(ast_dump_context); | |
14169 | ast_dump_context->ostream() << ")"; | |
14170 | } | |
14171 | ||
14172 | Expression* | |
14173 | Expression::make_interface_value(Type* type, Expression* first_value, | |
14174 | Expression* object, Location location) | |
14175 | { | |
14176 | return new Interface_value_expression(type, first_value, object, location); | |
14177 | } | |
14178 | ||
14179 | // An interface method table for a pair of types: an interface type and a type | |
14180 | // that implements that interface. | |
14181 | ||
14182 | class Interface_mtable_expression : public Expression | |
14183 | { | |
14184 | public: | |
14185 | Interface_mtable_expression(Interface_type* itype, Type* type, | |
14186 | bool is_pointer, Location location) | |
14187 | : Expression(EXPRESSION_INTERFACE_MTABLE, location), | |
14188 | itype_(itype), type_(type), is_pointer_(is_pointer), | |
14189 | method_table_type_(NULL), bvar_(NULL) | |
14190 | { } | |
14191 | ||
14192 | protected: | |
14193 | int | |
14194 | do_traverse(Traverse*); | |
14195 | ||
14196 | Type* | |
14197 | do_type(); | |
14198 | ||
14199 | bool | |
14200 | is_immutable() const | |
14201 | { return true; } | |
14202 | ||
14203 | void | |
14204 | do_determine_type(const Type_context*) | |
14205 | { go_unreachable(); } | |
14206 | ||
14207 | Expression* | |
14208 | do_copy() | |
14209 | { | |
14210 | return new Interface_mtable_expression(this->itype_, this->type_, | |
14211 | this->is_pointer_, this->location()); | |
14212 | } | |
14213 | ||
14214 | bool | |
14215 | do_is_addressable() const | |
14216 | { return true; } | |
14217 | ||
ea664253 | 14218 | Bexpression* |
14219 | do_get_backend(Translate_context* context); | |
2c809f8f | 14220 | |
14221 | void | |
14222 | do_dump_expression(Ast_dump_context*) const; | |
14223 | ||
14224 | private: | |
14225 | // The interface type for which the methods are defined. | |
14226 | Interface_type* itype_; | |
14227 | // The type to construct the interface method table for. | |
14228 | Type* type_; | |
14229 | // Whether this table contains the method set for the receiver type or the | |
14230 | // pointer receiver type. | |
14231 | bool is_pointer_; | |
14232 | // The type of the method table. | |
14233 | Type* method_table_type_; | |
14234 | // The backend variable that refers to the interface method table. | |
14235 | Bvariable* bvar_; | |
14236 | }; | |
14237 | ||
14238 | int | |
14239 | Interface_mtable_expression::do_traverse(Traverse* traverse) | |
14240 | { | |
14241 | if (Type::traverse(this->itype_, traverse) == TRAVERSE_EXIT | |
14242 | || Type::traverse(this->type_, traverse) == TRAVERSE_EXIT) | |
14243 | return TRAVERSE_EXIT; | |
14244 | return TRAVERSE_CONTINUE; | |
14245 | } | |
14246 | ||
14247 | Type* | |
14248 | Interface_mtable_expression::do_type() | |
14249 | { | |
14250 | if (this->method_table_type_ != NULL) | |
14251 | return this->method_table_type_; | |
14252 | ||
14253 | const Typed_identifier_list* interface_methods = this->itype_->methods(); | |
14254 | go_assert(!interface_methods->empty()); | |
14255 | ||
14256 | Struct_field_list* sfl = new Struct_field_list; | |
14257 | Typed_identifier tid("__type_descriptor", Type::make_type_descriptor_ptr_type(), | |
14258 | this->location()); | |
14259 | sfl->push_back(Struct_field(tid)); | |
14260 | for (Typed_identifier_list::const_iterator p = interface_methods->begin(); | |
14261 | p != interface_methods->end(); | |
14262 | ++p) | |
14263 | sfl->push_back(Struct_field(*p)); | |
14264 | this->method_table_type_ = Type::make_struct_type(sfl, this->location()); | |
14265 | return this->method_table_type_; | |
14266 | } | |
14267 | ||
ea664253 | 14268 | Bexpression* |
14269 | Interface_mtable_expression::do_get_backend(Translate_context* context) | |
2c809f8f | 14270 | { |
14271 | Gogo* gogo = context->gogo(); | |
2c809f8f | 14272 | Location loc = Linemap::predeclared_location(); |
14273 | if (this->bvar_ != NULL) | |
ea664253 | 14274 | return gogo->backend()->var_expression(this->bvar_, this->location()); |
2c809f8f | 14275 | |
14276 | const Typed_identifier_list* interface_methods = this->itype_->methods(); | |
14277 | go_assert(!interface_methods->empty()); | |
14278 | ||
14279 | std::string mangled_name = ((this->is_pointer_ ? "__go_pimt__" : "__go_imt_") | |
14280 | + this->itype_->mangled_name(gogo) | |
14281 | + "__" | |
14282 | + this->type_->mangled_name(gogo)); | |
14283 | ||
14284 | // See whether this interface has any hidden methods. | |
14285 | bool has_hidden_methods = false; | |
14286 | for (Typed_identifier_list::const_iterator p = interface_methods->begin(); | |
14287 | p != interface_methods->end(); | |
14288 | ++p) | |
14289 | { | |
14290 | if (Gogo::is_hidden_name(p->name())) | |
14291 | { | |
14292 | has_hidden_methods = true; | |
14293 | break; | |
14294 | } | |
14295 | } | |
14296 | ||
14297 | // We already know that the named type is convertible to the | |
14298 | // interface. If the interface has hidden methods, and the named | |
14299 | // type is defined in a different package, then the interface | |
14300 | // conversion table will be defined by that other package. | |
14301 | if (has_hidden_methods | |
14302 | && this->type_->named_type() != NULL | |
14303 | && this->type_->named_type()->named_object()->package() != NULL) | |
14304 | { | |
14305 | Btype* btype = this->type()->get_backend(gogo); | |
14306 | this->bvar_ = | |
14307 | gogo->backend()->immutable_struct_reference(mangled_name, btype, loc); | |
ea664253 | 14308 | return gogo->backend()->var_expression(this->bvar_, this->location()); |
2c809f8f | 14309 | } |
14310 | ||
14311 | // The first element is the type descriptor. | |
14312 | Type* td_type; | |
14313 | if (!this->is_pointer_) | |
14314 | td_type = this->type_; | |
14315 | else | |
14316 | td_type = Type::make_pointer_type(this->type_); | |
14317 | ||
14318 | // Build an interface method table for a type: a type descriptor followed by a | |
14319 | // list of function pointers, one for each interface method. This is used for | |
14320 | // interfaces. | |
14321 | Expression_list* svals = new Expression_list(); | |
14322 | svals->push_back(Expression::make_type_descriptor(td_type, loc)); | |
14323 | ||
14324 | Named_type* nt = this->type_->named_type(); | |
14325 | Struct_type* st = this->type_->struct_type(); | |
14326 | go_assert(nt != NULL || st != NULL); | |
14327 | ||
14328 | for (Typed_identifier_list::const_iterator p = interface_methods->begin(); | |
14329 | p != interface_methods->end(); | |
14330 | ++p) | |
14331 | { | |
14332 | bool is_ambiguous; | |
14333 | Method* m; | |
14334 | if (nt != NULL) | |
14335 | m = nt->method_function(p->name(), &is_ambiguous); | |
14336 | else | |
14337 | m = st->method_function(p->name(), &is_ambiguous); | |
14338 | go_assert(m != NULL); | |
14339 | Named_object* no = m->named_object(); | |
14340 | ||
14341 | go_assert(no->is_function() || no->is_function_declaration()); | |
14342 | svals->push_back(Expression::make_func_code_reference(no, loc)); | |
14343 | } | |
14344 | ||
14345 | Btype* btype = this->type()->get_backend(gogo); | |
14346 | Expression* mtable = Expression::make_struct_composite_literal(this->type(), | |
14347 | svals, loc); | |
ea664253 | 14348 | Bexpression* ctor = mtable->get_backend(context); |
2c809f8f | 14349 | |
14350 | bool is_public = has_hidden_methods && this->type_->named_type() != NULL; | |
14351 | this->bvar_ = gogo->backend()->immutable_struct(mangled_name, false, | |
14352 | !is_public, btype, loc); | |
14353 | gogo->backend()->immutable_struct_set_init(this->bvar_, mangled_name, false, | |
14354 | !is_public, btype, loc, ctor); | |
ea664253 | 14355 | return gogo->backend()->var_expression(this->bvar_, loc); |
2c809f8f | 14356 | } |
14357 | ||
14358 | void | |
14359 | Interface_mtable_expression::do_dump_expression( | |
14360 | Ast_dump_context* ast_dump_context) const | |
14361 | { | |
14362 | ast_dump_context->ostream() << "__go_" | |
14363 | << (this->is_pointer_ ? "pimt__" : "imt_"); | |
14364 | ast_dump_context->dump_type(this->itype_); | |
14365 | ast_dump_context->ostream() << "__"; | |
14366 | ast_dump_context->dump_type(this->type_); | |
14367 | } | |
14368 | ||
14369 | Expression* | |
14370 | Expression::make_interface_mtable_ref(Interface_type* itype, Type* type, | |
14371 | bool is_pointer, Location location) | |
14372 | { | |
14373 | return new Interface_mtable_expression(itype, type, is_pointer, location); | |
14374 | } | |
14375 | ||
e440a328 | 14376 | // An expression which evaluates to the offset of a field within a |
14377 | // struct. This, like Type_info_expression, q.v., is only used to | |
14378 | // initialize fields of a type descriptor. | |
14379 | ||
14380 | class Struct_field_offset_expression : public Expression | |
14381 | { | |
14382 | public: | |
14383 | Struct_field_offset_expression(Struct_type* type, const Struct_field* field) | |
b13c66cd | 14384 | : Expression(EXPRESSION_STRUCT_FIELD_OFFSET, |
14385 | Linemap::predeclared_location()), | |
e440a328 | 14386 | type_(type), field_(field) |
14387 | { } | |
14388 | ||
14389 | protected: | |
f23d7786 | 14390 | bool |
14391 | do_is_immutable() const | |
14392 | { return true; } | |
14393 | ||
e440a328 | 14394 | Type* |
14395 | do_type() | |
14396 | { return Type::lookup_integer_type("uintptr"); } | |
14397 | ||
14398 | void | |
14399 | do_determine_type(const Type_context*) | |
14400 | { } | |
14401 | ||
14402 | Expression* | |
14403 | do_copy() | |
14404 | { return this; } | |
14405 | ||
ea664253 | 14406 | Bexpression* |
14407 | do_get_backend(Translate_context* context); | |
e440a328 | 14408 | |
d751bb78 | 14409 | void |
14410 | do_dump_expression(Ast_dump_context*) const; | |
14411 | ||
e440a328 | 14412 | private: |
14413 | // The type of the struct. | |
14414 | Struct_type* type_; | |
14415 | // The field. | |
14416 | const Struct_field* field_; | |
14417 | }; | |
14418 | ||
ea664253 | 14419 | // Return the backend representation for a struct field offset. |
e440a328 | 14420 | |
ea664253 | 14421 | Bexpression* |
14422 | Struct_field_offset_expression::do_get_backend(Translate_context* context) | |
e440a328 | 14423 | { |
e440a328 | 14424 | const Struct_field_list* fields = this->type_->fields(); |
e440a328 | 14425 | Struct_field_list::const_iterator p; |
2c8bda43 | 14426 | unsigned i = 0; |
e440a328 | 14427 | for (p = fields->begin(); |
14428 | p != fields->end(); | |
2c8bda43 | 14429 | ++p, ++i) |
14430 | if (&*p == this->field_) | |
14431 | break; | |
c484d925 | 14432 | go_assert(&*p == this->field_); |
e440a328 | 14433 | |
2c8bda43 | 14434 | Gogo* gogo = context->gogo(); |
14435 | Btype* btype = this->type_->get_backend(gogo); | |
14436 | ||
3f378015 | 14437 | int64_t offset = gogo->backend()->type_field_offset(btype, i); |
2c8bda43 | 14438 | Type* uptr_type = Type::lookup_integer_type("uintptr"); |
e67508fa | 14439 | Expression* ret = |
3f378015 | 14440 | Expression::make_integer_int64(offset, uptr_type, |
14441 | Linemap::predeclared_location()); | |
ea664253 | 14442 | return ret->get_backend(context); |
e440a328 | 14443 | } |
14444 | ||
d751bb78 | 14445 | // Dump ast representation for a struct field offset expression. |
14446 | ||
14447 | void | |
14448 | Struct_field_offset_expression::do_dump_expression( | |
14449 | Ast_dump_context* ast_dump_context) const | |
14450 | { | |
14451 | ast_dump_context->ostream() << "unsafe.Offsetof("; | |
2d29d278 | 14452 | ast_dump_context->dump_type(this->type_); |
14453 | ast_dump_context->ostream() << '.'; | |
14454 | ast_dump_context->ostream() << | |
14455 | Gogo::message_name(this->field_->field_name()); | |
d751bb78 | 14456 | ast_dump_context->ostream() << ")"; |
14457 | } | |
14458 | ||
e440a328 | 14459 | // Make an expression for a struct field offset. |
14460 | ||
14461 | Expression* | |
14462 | Expression::make_struct_field_offset(Struct_type* type, | |
14463 | const Struct_field* field) | |
14464 | { | |
14465 | return new Struct_field_offset_expression(type, field); | |
14466 | } | |
14467 | ||
a9182619 | 14468 | // An expression which evaluates to a pointer to the map descriptor of |
14469 | // a map type. | |
14470 | ||
14471 | class Map_descriptor_expression : public Expression | |
14472 | { | |
14473 | public: | |
b13c66cd | 14474 | Map_descriptor_expression(Map_type* type, Location location) |
a9182619 | 14475 | : Expression(EXPRESSION_MAP_DESCRIPTOR, location), |
14476 | type_(type) | |
14477 | { } | |
14478 | ||
14479 | protected: | |
14480 | Type* | |
14481 | do_type() | |
14482 | { return Type::make_pointer_type(Map_type::make_map_descriptor_type()); } | |
14483 | ||
14484 | void | |
14485 | do_determine_type(const Type_context*) | |
14486 | { } | |
14487 | ||
14488 | Expression* | |
14489 | do_copy() | |
14490 | { return this; } | |
14491 | ||
ea664253 | 14492 | Bexpression* |
14493 | do_get_backend(Translate_context* context) | |
a9182619 | 14494 | { |
ea664253 | 14495 | return this->type_->map_descriptor_pointer(context->gogo(), |
14496 | this->location()); | |
a9182619 | 14497 | } |
14498 | ||
d751bb78 | 14499 | void |
14500 | do_dump_expression(Ast_dump_context*) const; | |
14501 | ||
a9182619 | 14502 | private: |
14503 | // The type for which this is the descriptor. | |
14504 | Map_type* type_; | |
14505 | }; | |
14506 | ||
d751bb78 | 14507 | // Dump ast representation for a map descriptor expression. |
14508 | ||
14509 | void | |
14510 | Map_descriptor_expression::do_dump_expression( | |
14511 | Ast_dump_context* ast_dump_context) const | |
14512 | { | |
14513 | ast_dump_context->ostream() << "map_descriptor("; | |
14514 | ast_dump_context->dump_type(this->type_); | |
14515 | ast_dump_context->ostream() << ")"; | |
14516 | } | |
14517 | ||
a9182619 | 14518 | // Make a map descriptor expression. |
14519 | ||
14520 | Expression* | |
b13c66cd | 14521 | Expression::make_map_descriptor(Map_type* type, Location location) |
a9182619 | 14522 | { |
14523 | return new Map_descriptor_expression(type, location); | |
14524 | } | |
14525 | ||
e440a328 | 14526 | // An expression which evaluates to the address of an unnamed label. |
14527 | ||
14528 | class Label_addr_expression : public Expression | |
14529 | { | |
14530 | public: | |
b13c66cd | 14531 | Label_addr_expression(Label* label, Location location) |
e440a328 | 14532 | : Expression(EXPRESSION_LABEL_ADDR, location), |
14533 | label_(label) | |
14534 | { } | |
14535 | ||
14536 | protected: | |
14537 | Type* | |
14538 | do_type() | |
14539 | { return Type::make_pointer_type(Type::make_void_type()); } | |
14540 | ||
14541 | void | |
14542 | do_determine_type(const Type_context*) | |
14543 | { } | |
14544 | ||
14545 | Expression* | |
14546 | do_copy() | |
14547 | { return new Label_addr_expression(this->label_, this->location()); } | |
14548 | ||
ea664253 | 14549 | Bexpression* |
14550 | do_get_backend(Translate_context* context) | |
14551 | { return this->label_->get_addr(context, this->location()); } | |
e440a328 | 14552 | |
d751bb78 | 14553 | void |
14554 | do_dump_expression(Ast_dump_context* ast_dump_context) const | |
14555 | { ast_dump_context->ostream() << this->label_->name(); } | |
14556 | ||
e440a328 | 14557 | private: |
14558 | // The label whose address we are taking. | |
14559 | Label* label_; | |
14560 | }; | |
14561 | ||
14562 | // Make an expression for the address of an unnamed label. | |
14563 | ||
14564 | Expression* | |
b13c66cd | 14565 | Expression::make_label_addr(Label* label, Location location) |
e440a328 | 14566 | { |
14567 | return new Label_addr_expression(label, location); | |
14568 | } | |
14569 | ||
da244e59 | 14570 | // Class Conditional_expression. |
283a177b | 14571 | |
2c809f8f | 14572 | // Traversal. |
14573 | ||
14574 | int | |
14575 | Conditional_expression::do_traverse(Traverse* traverse) | |
14576 | { | |
14577 | if (Expression::traverse(&this->cond_, traverse) == TRAVERSE_EXIT | |
14578 | || Expression::traverse(&this->then_, traverse) == TRAVERSE_EXIT | |
14579 | || Expression::traverse(&this->else_, traverse) == TRAVERSE_EXIT) | |
14580 | return TRAVERSE_EXIT; | |
14581 | return TRAVERSE_CONTINUE; | |
14582 | } | |
14583 | ||
283a177b | 14584 | // Return the type of the conditional expression. |
14585 | ||
14586 | Type* | |
14587 | Conditional_expression::do_type() | |
14588 | { | |
14589 | Type* result_type = Type::make_void_type(); | |
2c809f8f | 14590 | if (Type::are_identical(this->then_->type(), this->else_->type(), false, |
14591 | NULL)) | |
283a177b | 14592 | result_type = this->then_->type(); |
14593 | else if (this->then_->is_nil_expression() | |
14594 | || this->else_->is_nil_expression()) | |
14595 | result_type = (!this->then_->is_nil_expression() | |
14596 | ? this->then_->type() | |
14597 | : this->else_->type()); | |
14598 | return result_type; | |
14599 | } | |
14600 | ||
2c809f8f | 14601 | // Determine type for a conditional expression. |
14602 | ||
14603 | void | |
14604 | Conditional_expression::do_determine_type(const Type_context* context) | |
14605 | { | |
14606 | this->cond_->determine_type_no_context(); | |
14607 | this->then_->determine_type(context); | |
14608 | this->else_->determine_type(context); | |
14609 | } | |
14610 | ||
283a177b | 14611 | // Get the backend representation of a conditional expression. |
14612 | ||
ea664253 | 14613 | Bexpression* |
14614 | Conditional_expression::do_get_backend(Translate_context* context) | |
283a177b | 14615 | { |
14616 | Gogo* gogo = context->gogo(); | |
14617 | Btype* result_btype = this->type()->get_backend(gogo); | |
ea664253 | 14618 | Bexpression* cond = this->cond_->get_backend(context); |
14619 | Bexpression* then = this->then_->get_backend(context); | |
14620 | Bexpression* belse = this->else_->get_backend(context); | |
14621 | return gogo->backend()->conditional_expression(result_btype, cond, then, | |
14622 | belse, this->location()); | |
283a177b | 14623 | } |
14624 | ||
14625 | // Dump ast representation of a conditional expression. | |
14626 | ||
14627 | void | |
14628 | Conditional_expression::do_dump_expression( | |
14629 | Ast_dump_context* ast_dump_context) const | |
14630 | { | |
14631 | ast_dump_context->ostream() << "("; | |
14632 | ast_dump_context->dump_expression(this->cond_); | |
14633 | ast_dump_context->ostream() << " ? "; | |
14634 | ast_dump_context->dump_expression(this->then_); | |
14635 | ast_dump_context->ostream() << " : "; | |
14636 | ast_dump_context->dump_expression(this->else_); | |
14637 | ast_dump_context->ostream() << ") "; | |
14638 | } | |
14639 | ||
14640 | // Make a conditional expression. | |
14641 | ||
14642 | Expression* | |
14643 | Expression::make_conditional(Expression* cond, Expression* then, | |
14644 | Expression* else_expr, Location location) | |
14645 | { | |
14646 | return new Conditional_expression(cond, then, else_expr, location); | |
14647 | } | |
14648 | ||
da244e59 | 14649 | // Class Compound_expression. |
2c809f8f | 14650 | |
14651 | // Traversal. | |
14652 | ||
14653 | int | |
14654 | Compound_expression::do_traverse(Traverse* traverse) | |
14655 | { | |
14656 | if (Expression::traverse(&this->init_, traverse) == TRAVERSE_EXIT | |
14657 | || Expression::traverse(&this->expr_, traverse) == TRAVERSE_EXIT) | |
14658 | return TRAVERSE_EXIT; | |
14659 | return TRAVERSE_CONTINUE; | |
14660 | } | |
14661 | ||
14662 | // Return the type of the compound expression. | |
14663 | ||
14664 | Type* | |
14665 | Compound_expression::do_type() | |
14666 | { | |
14667 | return this->expr_->type(); | |
14668 | } | |
14669 | ||
14670 | // Determine type for a compound expression. | |
14671 | ||
14672 | void | |
14673 | Compound_expression::do_determine_type(const Type_context* context) | |
14674 | { | |
14675 | this->init_->determine_type_no_context(); | |
14676 | this->expr_->determine_type(context); | |
14677 | } | |
14678 | ||
14679 | // Get the backend representation of a compound expression. | |
14680 | ||
ea664253 | 14681 | Bexpression* |
14682 | Compound_expression::do_get_backend(Translate_context* context) | |
2c809f8f | 14683 | { |
14684 | Gogo* gogo = context->gogo(); | |
ea664253 | 14685 | Bexpression* binit = this->init_->get_backend(context); |
2c809f8f | 14686 | Bstatement* init_stmt = gogo->backend()->expression_statement(binit); |
ea664253 | 14687 | Bexpression* bexpr = this->expr_->get_backend(context); |
14688 | return gogo->backend()->compound_expression(init_stmt, bexpr, | |
14689 | this->location()); | |
2c809f8f | 14690 | } |
14691 | ||
14692 | // Dump ast representation of a conditional expression. | |
14693 | ||
14694 | void | |
14695 | Compound_expression::do_dump_expression( | |
14696 | Ast_dump_context* ast_dump_context) const | |
14697 | { | |
14698 | ast_dump_context->ostream() << "("; | |
14699 | ast_dump_context->dump_expression(this->init_); | |
14700 | ast_dump_context->ostream() << ","; | |
14701 | ast_dump_context->dump_expression(this->expr_); | |
14702 | ast_dump_context->ostream() << ") "; | |
14703 | } | |
14704 | ||
14705 | // Make a compound expression. | |
14706 | ||
14707 | Expression* | |
14708 | Expression::make_compound(Expression* init, Expression* expr, Location location) | |
14709 | { | |
14710 | return new Compound_expression(init, expr, location); | |
14711 | } | |
14712 | ||
e440a328 | 14713 | // Import an expression. This comes at the end in order to see the |
14714 | // various class definitions. | |
14715 | ||
14716 | Expression* | |
14717 | Expression::import_expression(Import* imp) | |
14718 | { | |
14719 | int c = imp->peek_char(); | |
14720 | if (imp->match_c_string("- ") | |
14721 | || imp->match_c_string("! ") | |
14722 | || imp->match_c_string("^ ")) | |
14723 | return Unary_expression::do_import(imp); | |
14724 | else if (c == '(') | |
14725 | return Binary_expression::do_import(imp); | |
14726 | else if (imp->match_c_string("true") | |
14727 | || imp->match_c_string("false")) | |
14728 | return Boolean_expression::do_import(imp); | |
14729 | else if (c == '"') | |
14730 | return String_expression::do_import(imp); | |
14731 | else if (c == '-' || (c >= '0' && c <= '9')) | |
14732 | { | |
14733 | // This handles integers, floats and complex constants. | |
14734 | return Integer_expression::do_import(imp); | |
14735 | } | |
14736 | else if (imp->match_c_string("nil")) | |
14737 | return Nil_expression::do_import(imp); | |
14738 | else if (imp->match_c_string("convert")) | |
14739 | return Type_conversion_expression::do_import(imp); | |
14740 | else | |
14741 | { | |
14742 | error_at(imp->location(), "import error: expected expression"); | |
14743 | return Expression::make_error(imp->location()); | |
14744 | } | |
14745 | } | |
14746 | ||
14747 | // Class Expression_list. | |
14748 | ||
14749 | // Traverse the list. | |
14750 | ||
14751 | int | |
14752 | Expression_list::traverse(Traverse* traverse) | |
14753 | { | |
14754 | for (Expression_list::iterator p = this->begin(); | |
14755 | p != this->end(); | |
14756 | ++p) | |
14757 | { | |
14758 | if (*p != NULL) | |
14759 | { | |
14760 | if (Expression::traverse(&*p, traverse) == TRAVERSE_EXIT) | |
14761 | return TRAVERSE_EXIT; | |
14762 | } | |
14763 | } | |
14764 | return TRAVERSE_CONTINUE; | |
14765 | } | |
14766 | ||
14767 | // Copy the list. | |
14768 | ||
14769 | Expression_list* | |
14770 | Expression_list::copy() | |
14771 | { | |
14772 | Expression_list* ret = new Expression_list(); | |
14773 | for (Expression_list::iterator p = this->begin(); | |
14774 | p != this->end(); | |
14775 | ++p) | |
14776 | { | |
14777 | if (*p == NULL) | |
14778 | ret->push_back(NULL); | |
14779 | else | |
14780 | ret->push_back((*p)->copy()); | |
14781 | } | |
14782 | return ret; | |
14783 | } | |
14784 | ||
14785 | // Return whether an expression list has an error expression. | |
14786 | ||
14787 | bool | |
14788 | Expression_list::contains_error() const | |
14789 | { | |
14790 | for (Expression_list::const_iterator p = this->begin(); | |
14791 | p != this->end(); | |
14792 | ++p) | |
14793 | if (*p != NULL && (*p)->is_error_expression()) | |
14794 | return true; | |
14795 | return false; | |
14796 | } | |
0c77715b | 14797 | |
14798 | // Class Numeric_constant. | |
14799 | ||
14800 | // Destructor. | |
14801 | ||
14802 | Numeric_constant::~Numeric_constant() | |
14803 | { | |
14804 | this->clear(); | |
14805 | } | |
14806 | ||
14807 | // Copy constructor. | |
14808 | ||
14809 | Numeric_constant::Numeric_constant(const Numeric_constant& a) | |
14810 | : classification_(a.classification_), type_(a.type_) | |
14811 | { | |
14812 | switch (a.classification_) | |
14813 | { | |
14814 | case NC_INVALID: | |
14815 | break; | |
14816 | case NC_INT: | |
14817 | case NC_RUNE: | |
14818 | mpz_init_set(this->u_.int_val, a.u_.int_val); | |
14819 | break; | |
14820 | case NC_FLOAT: | |
14821 | mpfr_init_set(this->u_.float_val, a.u_.float_val, GMP_RNDN); | |
14822 | break; | |
14823 | case NC_COMPLEX: | |
fcbea5e4 | 14824 | mpc_init2(this->u_.complex_val, mpc_precision); |
14825 | mpc_set(this->u_.complex_val, a.u_.complex_val, MPC_RNDNN); | |
0c77715b | 14826 | break; |
14827 | default: | |
14828 | go_unreachable(); | |
14829 | } | |
14830 | } | |
14831 | ||
14832 | // Assignment operator. | |
14833 | ||
14834 | Numeric_constant& | |
14835 | Numeric_constant::operator=(const Numeric_constant& a) | |
14836 | { | |
14837 | this->clear(); | |
14838 | this->classification_ = a.classification_; | |
14839 | this->type_ = a.type_; | |
14840 | switch (a.classification_) | |
14841 | { | |
14842 | case NC_INVALID: | |
14843 | break; | |
14844 | case NC_INT: | |
14845 | case NC_RUNE: | |
14846 | mpz_init_set(this->u_.int_val, a.u_.int_val); | |
14847 | break; | |
14848 | case NC_FLOAT: | |
14849 | mpfr_init_set(this->u_.float_val, a.u_.float_val, GMP_RNDN); | |
14850 | break; | |
14851 | case NC_COMPLEX: | |
fcbea5e4 | 14852 | mpc_init2(this->u_.complex_val, mpc_precision); |
14853 | mpc_set(this->u_.complex_val, a.u_.complex_val, MPC_RNDNN); | |
0c77715b | 14854 | break; |
14855 | default: | |
14856 | go_unreachable(); | |
14857 | } | |
14858 | return *this; | |
14859 | } | |
14860 | ||
14861 | // Clear the contents. | |
14862 | ||
14863 | void | |
14864 | Numeric_constant::clear() | |
14865 | { | |
14866 | switch (this->classification_) | |
14867 | { | |
14868 | case NC_INVALID: | |
14869 | break; | |
14870 | case NC_INT: | |
14871 | case NC_RUNE: | |
14872 | mpz_clear(this->u_.int_val); | |
14873 | break; | |
14874 | case NC_FLOAT: | |
14875 | mpfr_clear(this->u_.float_val); | |
14876 | break; | |
14877 | case NC_COMPLEX: | |
fcbea5e4 | 14878 | mpc_clear(this->u_.complex_val); |
0c77715b | 14879 | break; |
14880 | default: | |
14881 | go_unreachable(); | |
14882 | } | |
14883 | this->classification_ = NC_INVALID; | |
14884 | } | |
14885 | ||
14886 | // Set to an unsigned long value. | |
14887 | ||
14888 | void | |
14889 | Numeric_constant::set_unsigned_long(Type* type, unsigned long val) | |
14890 | { | |
14891 | this->clear(); | |
14892 | this->classification_ = NC_INT; | |
14893 | this->type_ = type; | |
14894 | mpz_init_set_ui(this->u_.int_val, val); | |
14895 | } | |
14896 | ||
14897 | // Set to an integer value. | |
14898 | ||
14899 | void | |
14900 | Numeric_constant::set_int(Type* type, const mpz_t val) | |
14901 | { | |
14902 | this->clear(); | |
14903 | this->classification_ = NC_INT; | |
14904 | this->type_ = type; | |
14905 | mpz_init_set(this->u_.int_val, val); | |
14906 | } | |
14907 | ||
14908 | // Set to a rune value. | |
14909 | ||
14910 | void | |
14911 | Numeric_constant::set_rune(Type* type, const mpz_t val) | |
14912 | { | |
14913 | this->clear(); | |
14914 | this->classification_ = NC_RUNE; | |
14915 | this->type_ = type; | |
14916 | mpz_init_set(this->u_.int_val, val); | |
14917 | } | |
14918 | ||
14919 | // Set to a floating point value. | |
14920 | ||
14921 | void | |
14922 | Numeric_constant::set_float(Type* type, const mpfr_t val) | |
14923 | { | |
14924 | this->clear(); | |
14925 | this->classification_ = NC_FLOAT; | |
14926 | this->type_ = type; | |
833b523c | 14927 | // Numeric constants do not have negative zero values, so remove |
14928 | // them here. They also don't have infinity or NaN values, but we | |
14929 | // should never see them here. | |
14930 | if (mpfr_zero_p(val)) | |
14931 | mpfr_init_set_ui(this->u_.float_val, 0, GMP_RNDN); | |
14932 | else | |
14933 | mpfr_init_set(this->u_.float_val, val, GMP_RNDN); | |
0c77715b | 14934 | } |
14935 | ||
14936 | // Set to a complex value. | |
14937 | ||
14938 | void | |
fcbea5e4 | 14939 | Numeric_constant::set_complex(Type* type, const mpc_t val) |
0c77715b | 14940 | { |
14941 | this->clear(); | |
14942 | this->classification_ = NC_COMPLEX; | |
14943 | this->type_ = type; | |
fcbea5e4 | 14944 | mpc_init2(this->u_.complex_val, mpc_precision); |
14945 | mpc_set(this->u_.complex_val, val, MPC_RNDNN); | |
0c77715b | 14946 | } |
14947 | ||
14948 | // Get an int value. | |
14949 | ||
14950 | void | |
14951 | Numeric_constant::get_int(mpz_t* val) const | |
14952 | { | |
14953 | go_assert(this->is_int()); | |
14954 | mpz_init_set(*val, this->u_.int_val); | |
14955 | } | |
14956 | ||
14957 | // Get a rune value. | |
14958 | ||
14959 | void | |
14960 | Numeric_constant::get_rune(mpz_t* val) const | |
14961 | { | |
14962 | go_assert(this->is_rune()); | |
14963 | mpz_init_set(*val, this->u_.int_val); | |
14964 | } | |
14965 | ||
14966 | // Get a floating point value. | |
14967 | ||
14968 | void | |
14969 | Numeric_constant::get_float(mpfr_t* val) const | |
14970 | { | |
14971 | go_assert(this->is_float()); | |
14972 | mpfr_init_set(*val, this->u_.float_val, GMP_RNDN); | |
14973 | } | |
14974 | ||
14975 | // Get a complex value. | |
14976 | ||
14977 | void | |
fcbea5e4 | 14978 | Numeric_constant::get_complex(mpc_t* val) const |
0c77715b | 14979 | { |
14980 | go_assert(this->is_complex()); | |
fcbea5e4 | 14981 | mpc_init2(*val, mpc_precision); |
14982 | mpc_set(*val, this->u_.complex_val, MPC_RNDNN); | |
0c77715b | 14983 | } |
14984 | ||
14985 | // Express value as unsigned long if possible. | |
14986 | ||
14987 | Numeric_constant::To_unsigned_long | |
14988 | Numeric_constant::to_unsigned_long(unsigned long* val) const | |
14989 | { | |
14990 | switch (this->classification_) | |
14991 | { | |
14992 | case NC_INT: | |
14993 | case NC_RUNE: | |
14994 | return this->mpz_to_unsigned_long(this->u_.int_val, val); | |
14995 | case NC_FLOAT: | |
14996 | return this->mpfr_to_unsigned_long(this->u_.float_val, val); | |
14997 | case NC_COMPLEX: | |
fcbea5e4 | 14998 | if (!mpfr_zero_p(mpc_imagref(this->u_.complex_val))) |
0c77715b | 14999 | return NC_UL_NOTINT; |
fcbea5e4 | 15000 | return this->mpfr_to_unsigned_long(mpc_realref(this->u_.complex_val), |
15001 | val); | |
0c77715b | 15002 | default: |
15003 | go_unreachable(); | |
15004 | } | |
15005 | } | |
15006 | ||
15007 | // Express integer value as unsigned long if possible. | |
15008 | ||
15009 | Numeric_constant::To_unsigned_long | |
15010 | Numeric_constant::mpz_to_unsigned_long(const mpz_t ival, | |
15011 | unsigned long *val) const | |
15012 | { | |
15013 | if (mpz_sgn(ival) < 0) | |
15014 | return NC_UL_NEGATIVE; | |
15015 | unsigned long ui = mpz_get_ui(ival); | |
15016 | if (mpz_cmp_ui(ival, ui) != 0) | |
15017 | return NC_UL_BIG; | |
15018 | *val = ui; | |
15019 | return NC_UL_VALID; | |
15020 | } | |
15021 | ||
15022 | // Express floating point value as unsigned long if possible. | |
15023 | ||
15024 | Numeric_constant::To_unsigned_long | |
15025 | Numeric_constant::mpfr_to_unsigned_long(const mpfr_t fval, | |
15026 | unsigned long *val) const | |
15027 | { | |
15028 | if (!mpfr_integer_p(fval)) | |
15029 | return NC_UL_NOTINT; | |
15030 | mpz_t ival; | |
15031 | mpz_init(ival); | |
15032 | mpfr_get_z(ival, fval, GMP_RNDN); | |
15033 | To_unsigned_long ret = this->mpz_to_unsigned_long(ival, val); | |
15034 | mpz_clear(ival); | |
15035 | return ret; | |
15036 | } | |
15037 | ||
15038 | // Convert value to integer if possible. | |
15039 | ||
15040 | bool | |
15041 | Numeric_constant::to_int(mpz_t* val) const | |
15042 | { | |
15043 | switch (this->classification_) | |
15044 | { | |
15045 | case NC_INT: | |
15046 | case NC_RUNE: | |
15047 | mpz_init_set(*val, this->u_.int_val); | |
15048 | return true; | |
15049 | case NC_FLOAT: | |
15050 | if (!mpfr_integer_p(this->u_.float_val)) | |
15051 | return false; | |
15052 | mpz_init(*val); | |
15053 | mpfr_get_z(*val, this->u_.float_val, GMP_RNDN); | |
15054 | return true; | |
15055 | case NC_COMPLEX: | |
fcbea5e4 | 15056 | if (!mpfr_zero_p(mpc_imagref(this->u_.complex_val)) |
15057 | || !mpfr_integer_p(mpc_realref(this->u_.complex_val))) | |
0c77715b | 15058 | return false; |
15059 | mpz_init(*val); | |
fcbea5e4 | 15060 | mpfr_get_z(*val, mpc_realref(this->u_.complex_val), GMP_RNDN); |
0c77715b | 15061 | return true; |
15062 | default: | |
15063 | go_unreachable(); | |
15064 | } | |
15065 | } | |
15066 | ||
15067 | // Convert value to floating point if possible. | |
15068 | ||
15069 | bool | |
15070 | Numeric_constant::to_float(mpfr_t* val) const | |
15071 | { | |
15072 | switch (this->classification_) | |
15073 | { | |
15074 | case NC_INT: | |
15075 | case NC_RUNE: | |
15076 | mpfr_init_set_z(*val, this->u_.int_val, GMP_RNDN); | |
15077 | return true; | |
15078 | case NC_FLOAT: | |
15079 | mpfr_init_set(*val, this->u_.float_val, GMP_RNDN); | |
15080 | return true; | |
15081 | case NC_COMPLEX: | |
fcbea5e4 | 15082 | if (!mpfr_zero_p(mpc_imagref(this->u_.complex_val))) |
0c77715b | 15083 | return false; |
fcbea5e4 | 15084 | mpfr_init_set(*val, mpc_realref(this->u_.complex_val), GMP_RNDN); |
0c77715b | 15085 | return true; |
15086 | default: | |
15087 | go_unreachable(); | |
15088 | } | |
15089 | } | |
15090 | ||
15091 | // Convert value to complex. | |
15092 | ||
15093 | bool | |
fcbea5e4 | 15094 | Numeric_constant::to_complex(mpc_t* val) const |
0c77715b | 15095 | { |
fcbea5e4 | 15096 | mpc_init2(*val, mpc_precision); |
0c77715b | 15097 | switch (this->classification_) |
15098 | { | |
15099 | case NC_INT: | |
15100 | case NC_RUNE: | |
fcbea5e4 | 15101 | mpc_set_z(*val, this->u_.int_val, MPC_RNDNN); |
0c77715b | 15102 | return true; |
15103 | case NC_FLOAT: | |
fcbea5e4 | 15104 | mpc_set_fr(*val, this->u_.float_val, MPC_RNDNN); |
0c77715b | 15105 | return true; |
15106 | case NC_COMPLEX: | |
fcbea5e4 | 15107 | mpc_set(*val, this->u_.complex_val, MPC_RNDNN); |
0c77715b | 15108 | return true; |
15109 | default: | |
15110 | go_unreachable(); | |
15111 | } | |
15112 | } | |
15113 | ||
15114 | // Get the type. | |
15115 | ||
15116 | Type* | |
15117 | Numeric_constant::type() const | |
15118 | { | |
15119 | if (this->type_ != NULL) | |
15120 | return this->type_; | |
15121 | switch (this->classification_) | |
15122 | { | |
15123 | case NC_INT: | |
15124 | return Type::make_abstract_integer_type(); | |
15125 | case NC_RUNE: | |
15126 | return Type::make_abstract_character_type(); | |
15127 | case NC_FLOAT: | |
15128 | return Type::make_abstract_float_type(); | |
15129 | case NC_COMPLEX: | |
15130 | return Type::make_abstract_complex_type(); | |
15131 | default: | |
15132 | go_unreachable(); | |
15133 | } | |
15134 | } | |
15135 | ||
15136 | // If the constant can be expressed in TYPE, then set the type of the | |
15137 | // constant to TYPE and return true. Otherwise return false, and, if | |
15138 | // ISSUE_ERROR is true, report an appropriate error message. | |
15139 | ||
15140 | bool | |
15141 | Numeric_constant::set_type(Type* type, bool issue_error, Location loc) | |
15142 | { | |
15143 | bool ret; | |
f11c2155 | 15144 | if (type == NULL || type->is_error()) |
0c77715b | 15145 | ret = true; |
15146 | else if (type->integer_type() != NULL) | |
15147 | ret = this->check_int_type(type->integer_type(), issue_error, loc); | |
15148 | else if (type->float_type() != NULL) | |
15149 | ret = this->check_float_type(type->float_type(), issue_error, loc); | |
15150 | else if (type->complex_type() != NULL) | |
15151 | ret = this->check_complex_type(type->complex_type(), issue_error, loc); | |
15152 | else | |
5706ab68 | 15153 | { |
15154 | ret = false; | |
15155 | if (issue_error) | |
15156 | go_assert(saw_errors()); | |
15157 | } | |
0c77715b | 15158 | if (ret) |
15159 | this->type_ = type; | |
15160 | return ret; | |
15161 | } | |
15162 | ||
15163 | // Check whether the constant can be expressed in an integer type. | |
15164 | ||
15165 | bool | |
15166 | Numeric_constant::check_int_type(Integer_type* type, bool issue_error, | |
15167 | Location location) const | |
15168 | { | |
15169 | mpz_t val; | |
15170 | switch (this->classification_) | |
15171 | { | |
15172 | case NC_INT: | |
15173 | case NC_RUNE: | |
15174 | mpz_init_set(val, this->u_.int_val); | |
15175 | break; | |
15176 | ||
15177 | case NC_FLOAT: | |
15178 | if (!mpfr_integer_p(this->u_.float_val)) | |
15179 | { | |
15180 | if (issue_error) | |
15181 | error_at(location, "floating point constant truncated to integer"); | |
15182 | return false; | |
15183 | } | |
15184 | mpz_init(val); | |
15185 | mpfr_get_z(val, this->u_.float_val, GMP_RNDN); | |
15186 | break; | |
15187 | ||
15188 | case NC_COMPLEX: | |
fcbea5e4 | 15189 | if (!mpfr_integer_p(mpc_realref(this->u_.complex_val)) |
15190 | || !mpfr_zero_p(mpc_imagref(this->u_.complex_val))) | |
0c77715b | 15191 | { |
15192 | if (issue_error) | |
15193 | error_at(location, "complex constant truncated to integer"); | |
15194 | return false; | |
15195 | } | |
15196 | mpz_init(val); | |
fcbea5e4 | 15197 | mpfr_get_z(val, mpc_realref(this->u_.complex_val), GMP_RNDN); |
0c77715b | 15198 | break; |
15199 | ||
15200 | default: | |
15201 | go_unreachable(); | |
15202 | } | |
15203 | ||
15204 | bool ret; | |
15205 | if (type->is_abstract()) | |
15206 | ret = true; | |
15207 | else | |
15208 | { | |
15209 | int bits = mpz_sizeinbase(val, 2); | |
15210 | if (type->is_unsigned()) | |
15211 | { | |
15212 | // For an unsigned type we can only accept a nonnegative | |
15213 | // number, and we must be able to represents at least BITS. | |
15214 | ret = mpz_sgn(val) >= 0 && bits <= type->bits(); | |
15215 | } | |
15216 | else | |
15217 | { | |
15218 | // For a signed type we need an extra bit to indicate the | |
15219 | // sign. We have to handle the most negative integer | |
15220 | // specially. | |
15221 | ret = (bits + 1 <= type->bits() | |
15222 | || (bits <= type->bits() | |
15223 | && mpz_sgn(val) < 0 | |
15224 | && (mpz_scan1(val, 0) | |
15225 | == static_cast<unsigned long>(type->bits() - 1)) | |
15226 | && mpz_scan0(val, type->bits()) == ULONG_MAX)); | |
15227 | } | |
15228 | } | |
15229 | ||
15230 | if (!ret && issue_error) | |
15231 | error_at(location, "integer constant overflow"); | |
15232 | ||
15233 | return ret; | |
15234 | } | |
15235 | ||
15236 | // Check whether the constant can be expressed in a floating point | |
15237 | // type. | |
15238 | ||
15239 | bool | |
15240 | Numeric_constant::check_float_type(Float_type* type, bool issue_error, | |
d0bcce51 | 15241 | Location location) |
0c77715b | 15242 | { |
15243 | mpfr_t val; | |
15244 | switch (this->classification_) | |
15245 | { | |
15246 | case NC_INT: | |
15247 | case NC_RUNE: | |
15248 | mpfr_init_set_z(val, this->u_.int_val, GMP_RNDN); | |
15249 | break; | |
15250 | ||
15251 | case NC_FLOAT: | |
15252 | mpfr_init_set(val, this->u_.float_val, GMP_RNDN); | |
15253 | break; | |
15254 | ||
15255 | case NC_COMPLEX: | |
fcbea5e4 | 15256 | if (!mpfr_zero_p(mpc_imagref(this->u_.complex_val))) |
0c77715b | 15257 | { |
15258 | if (issue_error) | |
15259 | error_at(location, "complex constant truncated to float"); | |
15260 | return false; | |
15261 | } | |
fcbea5e4 | 15262 | mpfr_init_set(val, mpc_realref(this->u_.complex_val), GMP_RNDN); |
0c77715b | 15263 | break; |
15264 | ||
15265 | default: | |
15266 | go_unreachable(); | |
15267 | } | |
15268 | ||
15269 | bool ret; | |
15270 | if (type->is_abstract()) | |
15271 | ret = true; | |
15272 | else if (mpfr_nan_p(val) || mpfr_inf_p(val) || mpfr_zero_p(val)) | |
15273 | { | |
15274 | // A NaN or Infinity always fits in the range of the type. | |
15275 | ret = true; | |
15276 | } | |
15277 | else | |
15278 | { | |
15279 | mp_exp_t exp = mpfr_get_exp(val); | |
15280 | mp_exp_t max_exp; | |
15281 | switch (type->bits()) | |
15282 | { | |
15283 | case 32: | |
15284 | max_exp = 128; | |
15285 | break; | |
15286 | case 64: | |
15287 | max_exp = 1024; | |
15288 | break; | |
15289 | default: | |
15290 | go_unreachable(); | |
15291 | } | |
15292 | ||
15293 | ret = exp <= max_exp; | |
d0bcce51 | 15294 | |
15295 | if (ret) | |
15296 | { | |
15297 | // Round the constant to the desired type. | |
15298 | mpfr_t t; | |
15299 | mpfr_init(t); | |
15300 | switch (type->bits()) | |
15301 | { | |
15302 | case 32: | |
15303 | mpfr_set_prec(t, 24); | |
15304 | break; | |
15305 | case 64: | |
15306 | mpfr_set_prec(t, 53); | |
15307 | break; | |
15308 | default: | |
15309 | go_unreachable(); | |
15310 | } | |
15311 | mpfr_set(t, val, GMP_RNDN); | |
15312 | mpfr_set(val, t, GMP_RNDN); | |
15313 | mpfr_clear(t); | |
15314 | ||
15315 | this->set_float(type, val); | |
15316 | } | |
0c77715b | 15317 | } |
15318 | ||
15319 | mpfr_clear(val); | |
15320 | ||
15321 | if (!ret && issue_error) | |
15322 | error_at(location, "floating point constant overflow"); | |
15323 | ||
15324 | return ret; | |
15325 | } | |
15326 | ||
15327 | // Check whether the constant can be expressed in a complex type. | |
15328 | ||
15329 | bool | |
15330 | Numeric_constant::check_complex_type(Complex_type* type, bool issue_error, | |
d0bcce51 | 15331 | Location location) |
0c77715b | 15332 | { |
15333 | if (type->is_abstract()) | |
15334 | return true; | |
15335 | ||
15336 | mp_exp_t max_exp; | |
15337 | switch (type->bits()) | |
15338 | { | |
15339 | case 64: | |
15340 | max_exp = 128; | |
15341 | break; | |
15342 | case 128: | |
15343 | max_exp = 1024; | |
15344 | break; | |
15345 | default: | |
15346 | go_unreachable(); | |
15347 | } | |
15348 | ||
fcbea5e4 | 15349 | mpc_t val; |
15350 | mpc_init2(val, mpc_precision); | |
0c77715b | 15351 | switch (this->classification_) |
15352 | { | |
15353 | case NC_INT: | |
15354 | case NC_RUNE: | |
fcbea5e4 | 15355 | mpc_set_z(val, this->u_.int_val, MPC_RNDNN); |
0c77715b | 15356 | break; |
15357 | ||
15358 | case NC_FLOAT: | |
fcbea5e4 | 15359 | mpc_set_fr(val, this->u_.float_val, MPC_RNDNN); |
0c77715b | 15360 | break; |
15361 | ||
15362 | case NC_COMPLEX: | |
fcbea5e4 | 15363 | mpc_set(val, this->u_.complex_val, MPC_RNDNN); |
0c77715b | 15364 | break; |
15365 | ||
15366 | default: | |
15367 | go_unreachable(); | |
15368 | } | |
15369 | ||
d0bcce51 | 15370 | bool ret = true; |
fcbea5e4 | 15371 | if (!mpfr_nan_p(mpc_realref(val)) |
15372 | && !mpfr_inf_p(mpc_realref(val)) | |
15373 | && !mpfr_zero_p(mpc_realref(val)) | |
15374 | && mpfr_get_exp(mpc_realref(val)) > max_exp) | |
d0bcce51 | 15375 | { |
15376 | if (issue_error) | |
15377 | error_at(location, "complex real part overflow"); | |
15378 | ret = false; | |
15379 | } | |
0c77715b | 15380 | |
fcbea5e4 | 15381 | if (!mpfr_nan_p(mpc_imagref(val)) |
15382 | && !mpfr_inf_p(mpc_imagref(val)) | |
15383 | && !mpfr_zero_p(mpc_imagref(val)) | |
15384 | && mpfr_get_exp(mpc_imagref(val)) > max_exp) | |
d0bcce51 | 15385 | { |
15386 | if (issue_error) | |
15387 | error_at(location, "complex imaginary part overflow"); | |
15388 | ret = false; | |
15389 | } | |
0c77715b | 15390 | |
d0bcce51 | 15391 | if (ret) |
15392 | { | |
15393 | // Round the constant to the desired type. | |
fcbea5e4 | 15394 | mpc_t t; |
d0bcce51 | 15395 | switch (type->bits()) |
15396 | { | |
15397 | case 64: | |
fcbea5e4 | 15398 | mpc_init2(t, 24); |
d0bcce51 | 15399 | break; |
15400 | case 128: | |
fcbea5e4 | 15401 | mpc_init2(t, 53); |
d0bcce51 | 15402 | break; |
15403 | default: | |
15404 | go_unreachable(); | |
15405 | } | |
fcbea5e4 | 15406 | mpc_set(t, val, MPC_RNDNN); |
15407 | mpc_set(val, t, MPC_RNDNN); | |
15408 | mpc_clear(t); | |
d0bcce51 | 15409 | |
fcbea5e4 | 15410 | this->set_complex(type, val); |
d0bcce51 | 15411 | } |
15412 | ||
fcbea5e4 | 15413 | mpc_clear(val); |
0c77715b | 15414 | |
15415 | return ret; | |
15416 | } | |
15417 | ||
15418 | // Return an Expression for this value. | |
15419 | ||
15420 | Expression* | |
15421 | Numeric_constant::expression(Location loc) const | |
15422 | { | |
15423 | switch (this->classification_) | |
15424 | { | |
15425 | case NC_INT: | |
e67508fa | 15426 | return Expression::make_integer_z(&this->u_.int_val, this->type_, loc); |
0c77715b | 15427 | case NC_RUNE: |
15428 | return Expression::make_character(&this->u_.int_val, this->type_, loc); | |
15429 | case NC_FLOAT: | |
15430 | return Expression::make_float(&this->u_.float_val, this->type_, loc); | |
15431 | case NC_COMPLEX: | |
fcbea5e4 | 15432 | return Expression::make_complex(&this->u_.complex_val, this->type_, loc); |
0c77715b | 15433 | default: |
15434 | go_unreachable(); | |
15435 | } | |
15436 | } |