]>
Commit | Line | Data |
---|---|---|
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 | { |
b1d7ecfa | 1144 | Func_expression* fe = new Func_expression(function, closure, location); |
1145 | ||
1146 | // Detect references to builtin functions and set the runtime code if | |
1147 | // appropriate. | |
1148 | if (function->is_function_declaration()) | |
1149 | fe->set_runtime_code(Runtime::name_to_code(function->name())); | |
1150 | return fe; | |
e440a328 | 1151 | } |
1152 | ||
c6837989 | 1153 | // Class Func_descriptor_expression. |
8381eda7 | 1154 | |
c6837989 | 1155 | // Constructor. |
8381eda7 | 1156 | |
c6837989 | 1157 | Func_descriptor_expression::Func_descriptor_expression(Named_object* fn) |
1158 | : Expression(EXPRESSION_FUNC_DESCRIPTOR, fn->location()), | |
f8bdf81a | 1159 | fn_(fn), dvar_(NULL) |
c6837989 | 1160 | { |
1161 | go_assert(!fn->is_function() || !fn->func_value()->needs_closure()); | |
1162 | } | |
8381eda7 | 1163 | |
c6837989 | 1164 | // Traversal. |
8381eda7 | 1165 | |
c6837989 | 1166 | int |
1167 | Func_descriptor_expression::do_traverse(Traverse*) | |
1168 | { | |
1169 | return TRAVERSE_CONTINUE; | |
1170 | } | |
8381eda7 | 1171 | |
1172 | // All function descriptors have the same type. | |
1173 | ||
1174 | Type* Func_descriptor_expression::descriptor_type; | |
1175 | ||
1176 | void | |
1177 | Func_descriptor_expression::make_func_descriptor_type() | |
1178 | { | |
1179 | if (Func_descriptor_expression::descriptor_type != NULL) | |
1180 | return; | |
1181 | Type* uintptr_type = Type::lookup_integer_type("uintptr"); | |
1182 | Type* struct_type = Type::make_builtin_struct_type(1, "code", uintptr_type); | |
1183 | Func_descriptor_expression::descriptor_type = | |
1184 | Type::make_builtin_named_type("functionDescriptor", struct_type); | |
1185 | } | |
1186 | ||
1187 | Type* | |
1188 | Func_descriptor_expression::do_type() | |
1189 | { | |
1190 | Func_descriptor_expression::make_func_descriptor_type(); | |
1191 | return Func_descriptor_expression::descriptor_type; | |
1192 | } | |
1193 | ||
ea664253 | 1194 | // The backend representation for a function descriptor. |
8381eda7 | 1195 | |
ea664253 | 1196 | Bexpression* |
1197 | Func_descriptor_expression::do_get_backend(Translate_context* context) | |
8381eda7 | 1198 | { |
8381eda7 | 1199 | Named_object* no = this->fn_; |
1200 | Location loc = no->location(); | |
ea664253 | 1201 | if (this->dvar_ != NULL) |
1202 | return context->backend()->var_expression(this->dvar_, loc); | |
8381eda7 | 1203 | |
ea664253 | 1204 | Gogo* gogo = context->gogo(); |
8381eda7 | 1205 | std::string var_name; |
09e57698 | 1206 | bool is_descriptor = false; |
1207 | if (no->is_function_declaration() | |
1208 | && !no->func_declaration_value()->asm_name().empty() | |
1209 | && Linemap::is_predeclared_location(no->location())) | |
1210 | { | |
1211 | var_name = no->func_declaration_value()->asm_name() + "_descriptor"; | |
1212 | is_descriptor = true; | |
1213 | } | |
8381eda7 | 1214 | else |
09e57698 | 1215 | { |
1216 | if (no->package() == NULL) | |
1217 | var_name = gogo->pkgpath_symbol(); | |
1218 | else | |
1219 | var_name = no->package()->pkgpath_symbol(); | |
1220 | var_name.push_back('.'); | |
1221 | var_name.append(Gogo::unpack_hidden_name(no->name())); | |
1222 | var_name.append("$descriptor"); | |
1223 | } | |
8381eda7 | 1224 | |
1225 | Btype* btype = this->type()->get_backend(gogo); | |
1226 | ||
1227 | Bvariable* bvar; | |
09e57698 | 1228 | if (no->package() != NULL || is_descriptor) |
f8bdf81a | 1229 | bvar = context->backend()->immutable_struct_reference(var_name, btype, |
1230 | loc); | |
8381eda7 | 1231 | else |
1232 | { | |
1233 | Location bloc = Linemap::predeclared_location(); | |
1234 | bool is_hidden = ((no->is_function() | |
1235 | && no->func_value()->enclosing() != NULL) | |
1236 | || Gogo::is_thunk(no)); | |
1237 | bvar = context->backend()->immutable_struct(var_name, is_hidden, false, | |
1238 | btype, bloc); | |
1239 | Expression_list* vals = new Expression_list(); | |
f8bdf81a | 1240 | vals->push_back(Expression::make_func_code_reference(this->fn_, bloc)); |
8381eda7 | 1241 | Expression* init = |
1242 | Expression::make_struct_composite_literal(this->type(), vals, bloc); | |
1243 | Translate_context bcontext(gogo, NULL, NULL, NULL); | |
1244 | bcontext.set_is_const(); | |
ea664253 | 1245 | Bexpression* binit = init->get_backend(&bcontext); |
8381eda7 | 1246 | context->backend()->immutable_struct_set_init(bvar, var_name, is_hidden, |
1247 | false, btype, bloc, binit); | |
1248 | } | |
1249 | ||
1250 | this->dvar_ = bvar; | |
ea664253 | 1251 | return gogo->backend()->var_expression(bvar, loc); |
8381eda7 | 1252 | } |
1253 | ||
c6837989 | 1254 | // Print a function descriptor expression. |
1255 | ||
1256 | void | |
1257 | Func_descriptor_expression::do_dump_expression(Ast_dump_context* context) const | |
1258 | { | |
1259 | context->ostream() << "[descriptor " << this->fn_->name() << "]"; | |
1260 | } | |
1261 | ||
8381eda7 | 1262 | // Make a function descriptor expression. |
1263 | ||
c6837989 | 1264 | Func_descriptor_expression* |
1265 | Expression::make_func_descriptor(Named_object* fn) | |
8381eda7 | 1266 | { |
c6837989 | 1267 | return new Func_descriptor_expression(fn); |
8381eda7 | 1268 | } |
1269 | ||
1270 | // Make the function descriptor type, so that it can be converted. | |
1271 | ||
1272 | void | |
1273 | Expression::make_func_descriptor_type() | |
1274 | { | |
1275 | Func_descriptor_expression::make_func_descriptor_type(); | |
1276 | } | |
1277 | ||
1278 | // A reference to just the code of a function. | |
1279 | ||
1280 | class Func_code_reference_expression : public Expression | |
1281 | { | |
1282 | public: | |
1283 | Func_code_reference_expression(Named_object* function, Location location) | |
1284 | : Expression(EXPRESSION_FUNC_CODE_REFERENCE, location), | |
1285 | function_(function) | |
1286 | { } | |
1287 | ||
1288 | protected: | |
1289 | int | |
1290 | do_traverse(Traverse*) | |
1291 | { return TRAVERSE_CONTINUE; } | |
1292 | ||
f9ca30f9 | 1293 | bool |
1294 | do_is_immutable() const | |
1295 | { return true; } | |
1296 | ||
8381eda7 | 1297 | Type* |
1298 | do_type() | |
1299 | { return Type::make_pointer_type(Type::make_void_type()); } | |
1300 | ||
1301 | void | |
1302 | do_determine_type(const Type_context*) | |
1303 | { } | |
1304 | ||
1305 | Expression* | |
1306 | do_copy() | |
1307 | { | |
1308 | return Expression::make_func_code_reference(this->function_, | |
1309 | this->location()); | |
1310 | } | |
1311 | ||
ea664253 | 1312 | Bexpression* |
1313 | do_get_backend(Translate_context*); | |
8381eda7 | 1314 | |
1315 | void | |
1316 | do_dump_expression(Ast_dump_context* context) const | |
1317 | { context->ostream() << "[raw " << this->function_->name() << "]" ; } | |
1318 | ||
1319 | private: | |
1320 | // The function. | |
1321 | Named_object* function_; | |
1322 | }; | |
1323 | ||
ea664253 | 1324 | // Get the backend representation for a reference to function code. |
8381eda7 | 1325 | |
ea664253 | 1326 | Bexpression* |
1327 | Func_code_reference_expression::do_get_backend(Translate_context* context) | |
8381eda7 | 1328 | { |
ea664253 | 1329 | return Func_expression::get_code_pointer(context->gogo(), this->function_, |
1330 | this->location()); | |
8381eda7 | 1331 | } |
1332 | ||
1333 | // Make a reference to the code of a function. | |
1334 | ||
1335 | Expression* | |
1336 | Expression::make_func_code_reference(Named_object* function, Location location) | |
1337 | { | |
1338 | return new Func_code_reference_expression(function, location); | |
1339 | } | |
1340 | ||
e440a328 | 1341 | // Class Unknown_expression. |
1342 | ||
1343 | // Return the name of an unknown expression. | |
1344 | ||
1345 | const std::string& | |
1346 | Unknown_expression::name() const | |
1347 | { | |
1348 | return this->named_object_->name(); | |
1349 | } | |
1350 | ||
1351 | // Lower a reference to an unknown name. | |
1352 | ||
1353 | Expression* | |
ceeb4318 | 1354 | Unknown_expression::do_lower(Gogo*, Named_object*, Statement_inserter*, int) |
e440a328 | 1355 | { |
b13c66cd | 1356 | Location location = this->location(); |
e440a328 | 1357 | Named_object* no = this->named_object_; |
deded542 | 1358 | Named_object* real; |
1359 | if (!no->is_unknown()) | |
1360 | real = no; | |
1361 | else | |
e440a328 | 1362 | { |
deded542 | 1363 | real = no->unknown_value()->real_named_object(); |
1364 | if (real == NULL) | |
1365 | { | |
1366 | if (this->is_composite_literal_key_) | |
1367 | return this; | |
acf8e158 | 1368 | if (!this->no_error_message_) |
1369 | error_at(location, "reference to undefined name %qs", | |
1370 | this->named_object_->message_name().c_str()); | |
deded542 | 1371 | return Expression::make_error(location); |
1372 | } | |
e440a328 | 1373 | } |
1374 | switch (real->classification()) | |
1375 | { | |
1376 | case Named_object::NAMED_OBJECT_CONST: | |
1377 | return Expression::make_const_reference(real, location); | |
1378 | case Named_object::NAMED_OBJECT_TYPE: | |
1379 | return Expression::make_type(real->type_value(), location); | |
1380 | case Named_object::NAMED_OBJECT_TYPE_DECLARATION: | |
1381 | if (this->is_composite_literal_key_) | |
1382 | return this; | |
acf8e158 | 1383 | if (!this->no_error_message_) |
1384 | error_at(location, "reference to undefined type %qs", | |
1385 | real->message_name().c_str()); | |
e440a328 | 1386 | return Expression::make_error(location); |
1387 | case Named_object::NAMED_OBJECT_VAR: | |
7d834090 | 1388 | real->var_value()->set_is_used(); |
e440a328 | 1389 | return Expression::make_var_reference(real, location); |
1390 | case Named_object::NAMED_OBJECT_FUNC: | |
1391 | case Named_object::NAMED_OBJECT_FUNC_DECLARATION: | |
1392 | return Expression::make_func_reference(real, NULL, location); | |
1393 | case Named_object::NAMED_OBJECT_PACKAGE: | |
1394 | if (this->is_composite_literal_key_) | |
1395 | return this; | |
acf8e158 | 1396 | if (!this->no_error_message_) |
1397 | error_at(location, "unexpected reference to package"); | |
e440a328 | 1398 | return Expression::make_error(location); |
1399 | default: | |
c3e6f413 | 1400 | go_unreachable(); |
e440a328 | 1401 | } |
1402 | } | |
1403 | ||
d751bb78 | 1404 | // Dump the ast representation for an unknown expression to a dump context. |
1405 | ||
1406 | void | |
1407 | Unknown_expression::do_dump_expression(Ast_dump_context* ast_dump_context) const | |
1408 | { | |
1409 | ast_dump_context->ostream() << "_Unknown_(" << this->named_object_->name() | |
1410 | << ")"; | |
d751bb78 | 1411 | } |
1412 | ||
e440a328 | 1413 | // Make a reference to an unknown name. |
1414 | ||
acf8e158 | 1415 | Unknown_expression* |
b13c66cd | 1416 | Expression::make_unknown_reference(Named_object* no, Location location) |
e440a328 | 1417 | { |
e440a328 | 1418 | return new Unknown_expression(no, location); |
1419 | } | |
1420 | ||
1421 | // A boolean expression. | |
1422 | ||
1423 | class Boolean_expression : public Expression | |
1424 | { | |
1425 | public: | |
b13c66cd | 1426 | Boolean_expression(bool val, Location location) |
e440a328 | 1427 | : Expression(EXPRESSION_BOOLEAN, location), |
1428 | val_(val), type_(NULL) | |
1429 | { } | |
1430 | ||
1431 | static Expression* | |
1432 | do_import(Import*); | |
1433 | ||
1434 | protected: | |
1435 | bool | |
1436 | do_is_constant() const | |
1437 | { return true; } | |
1438 | ||
0e168074 | 1439 | bool |
1440 | do_is_immutable() const | |
1441 | { return true; } | |
1442 | ||
e440a328 | 1443 | Type* |
1444 | do_type(); | |
1445 | ||
1446 | void | |
1447 | do_determine_type(const Type_context*); | |
1448 | ||
1449 | Expression* | |
1450 | do_copy() | |
1451 | { return this; } | |
1452 | ||
ea664253 | 1453 | Bexpression* |
1454 | do_get_backend(Translate_context* context) | |
1455 | { return context->backend()->boolean_constant_expression(this->val_); } | |
e440a328 | 1456 | |
1457 | void | |
1458 | do_export(Export* exp) const | |
1459 | { exp->write_c_string(this->val_ ? "true" : "false"); } | |
1460 | ||
d751bb78 | 1461 | void |
1462 | do_dump_expression(Ast_dump_context* ast_dump_context) const | |
1463 | { ast_dump_context->ostream() << (this->val_ ? "true" : "false"); } | |
1464 | ||
e440a328 | 1465 | private: |
1466 | // The constant. | |
1467 | bool val_; | |
1468 | // The type as determined by context. | |
1469 | Type* type_; | |
1470 | }; | |
1471 | ||
1472 | // Get the type. | |
1473 | ||
1474 | Type* | |
1475 | Boolean_expression::do_type() | |
1476 | { | |
1477 | if (this->type_ == NULL) | |
1478 | this->type_ = Type::make_boolean_type(); | |
1479 | return this->type_; | |
1480 | } | |
1481 | ||
1482 | // Set the type from the context. | |
1483 | ||
1484 | void | |
1485 | Boolean_expression::do_determine_type(const Type_context* context) | |
1486 | { | |
1487 | if (this->type_ != NULL && !this->type_->is_abstract()) | |
1488 | ; | |
1489 | else if (context->type != NULL && context->type->is_boolean_type()) | |
1490 | this->type_ = context->type; | |
1491 | else if (!context->may_be_abstract) | |
1492 | this->type_ = Type::lookup_bool_type(); | |
1493 | } | |
1494 | ||
1495 | // Import a boolean constant. | |
1496 | ||
1497 | Expression* | |
1498 | Boolean_expression::do_import(Import* imp) | |
1499 | { | |
1500 | if (imp->peek_char() == 't') | |
1501 | { | |
1502 | imp->require_c_string("true"); | |
1503 | return Expression::make_boolean(true, imp->location()); | |
1504 | } | |
1505 | else | |
1506 | { | |
1507 | imp->require_c_string("false"); | |
1508 | return Expression::make_boolean(false, imp->location()); | |
1509 | } | |
1510 | } | |
1511 | ||
1512 | // Make a boolean expression. | |
1513 | ||
1514 | Expression* | |
b13c66cd | 1515 | Expression::make_boolean(bool val, Location location) |
e440a328 | 1516 | { |
1517 | return new Boolean_expression(val, location); | |
1518 | } | |
1519 | ||
1520 | // Class String_expression. | |
1521 | ||
1522 | // Get the type. | |
1523 | ||
1524 | Type* | |
1525 | String_expression::do_type() | |
1526 | { | |
1527 | if (this->type_ == NULL) | |
1528 | this->type_ = Type::make_string_type(); | |
1529 | return this->type_; | |
1530 | } | |
1531 | ||
1532 | // Set the type from the context. | |
1533 | ||
1534 | void | |
1535 | String_expression::do_determine_type(const Type_context* context) | |
1536 | { | |
1537 | if (this->type_ != NULL && !this->type_->is_abstract()) | |
1538 | ; | |
1539 | else if (context->type != NULL && context->type->is_string_type()) | |
1540 | this->type_ = context->type; | |
1541 | else if (!context->may_be_abstract) | |
1542 | this->type_ = Type::lookup_string_type(); | |
1543 | } | |
1544 | ||
1545 | // Build a string constant. | |
1546 | ||
ea664253 | 1547 | Bexpression* |
1548 | String_expression::do_get_backend(Translate_context* context) | |
e440a328 | 1549 | { |
2c809f8f | 1550 | Gogo* gogo = context->gogo(); |
1551 | Btype* btype = Type::make_string_type()->get_backend(gogo); | |
1552 | ||
1553 | Location loc = this->location(); | |
1554 | std::vector<Bexpression*> init(2); | |
1555 | Bexpression* str_cst = | |
1556 | gogo->backend()->string_constant_expression(this->val_); | |
1557 | init[0] = gogo->backend()->address_expression(str_cst, loc); | |
1558 | ||
1559 | Btype* int_btype = Type::lookup_integer_type("int")->get_backend(gogo); | |
1560 | mpz_t lenval; | |
1561 | mpz_init_set_ui(lenval, this->val_.length()); | |
1562 | init[1] = gogo->backend()->integer_constant_expression(int_btype, lenval); | |
1563 | mpz_clear(lenval); | |
1564 | ||
ea664253 | 1565 | return gogo->backend()->constructor_expression(btype, init, loc); |
e440a328 | 1566 | } |
1567 | ||
8b1c301d | 1568 | // Write string literal to string dump. |
e440a328 | 1569 | |
1570 | void | |
8b1c301d | 1571 | String_expression::export_string(String_dump* exp, |
1572 | const String_expression* str) | |
e440a328 | 1573 | { |
1574 | std::string s; | |
8b1c301d | 1575 | s.reserve(str->val_.length() * 4 + 2); |
e440a328 | 1576 | s += '"'; |
8b1c301d | 1577 | for (std::string::const_iterator p = str->val_.begin(); |
1578 | p != str->val_.end(); | |
e440a328 | 1579 | ++p) |
1580 | { | |
1581 | if (*p == '\\' || *p == '"') | |
1582 | { | |
1583 | s += '\\'; | |
1584 | s += *p; | |
1585 | } | |
1586 | else if (*p >= 0x20 && *p < 0x7f) | |
1587 | s += *p; | |
1588 | else if (*p == '\n') | |
1589 | s += "\\n"; | |
1590 | else if (*p == '\t') | |
1591 | s += "\\t"; | |
1592 | else | |
1593 | { | |
1594 | s += "\\x"; | |
1595 | unsigned char c = *p; | |
1596 | unsigned int dig = c >> 4; | |
1597 | s += dig < 10 ? '0' + dig : 'A' + dig - 10; | |
1598 | dig = c & 0xf; | |
1599 | s += dig < 10 ? '0' + dig : 'A' + dig - 10; | |
1600 | } | |
1601 | } | |
1602 | s += '"'; | |
1603 | exp->write_string(s); | |
1604 | } | |
1605 | ||
8b1c301d | 1606 | // Export a string expression. |
1607 | ||
1608 | void | |
1609 | String_expression::do_export(Export* exp) const | |
1610 | { | |
1611 | String_expression::export_string(exp, this); | |
1612 | } | |
1613 | ||
e440a328 | 1614 | // Import a string expression. |
1615 | ||
1616 | Expression* | |
1617 | String_expression::do_import(Import* imp) | |
1618 | { | |
1619 | imp->require_c_string("\""); | |
1620 | std::string val; | |
1621 | while (true) | |
1622 | { | |
1623 | int c = imp->get_char(); | |
1624 | if (c == '"' || c == -1) | |
1625 | break; | |
1626 | if (c != '\\') | |
1627 | val += static_cast<char>(c); | |
1628 | else | |
1629 | { | |
1630 | c = imp->get_char(); | |
1631 | if (c == '\\' || c == '"') | |
1632 | val += static_cast<char>(c); | |
1633 | else if (c == 'n') | |
1634 | val += '\n'; | |
1635 | else if (c == 't') | |
1636 | val += '\t'; | |
1637 | else if (c == 'x') | |
1638 | { | |
1639 | c = imp->get_char(); | |
1640 | unsigned int vh = c >= '0' && c <= '9' ? c - '0' : c - 'A' + 10; | |
1641 | c = imp->get_char(); | |
1642 | unsigned int vl = c >= '0' && c <= '9' ? c - '0' : c - 'A' + 10; | |
1643 | char v = (vh << 4) | vl; | |
1644 | val += v; | |
1645 | } | |
1646 | else | |
1647 | { | |
1648 | error_at(imp->location(), "bad string constant"); | |
1649 | return Expression::make_error(imp->location()); | |
1650 | } | |
1651 | } | |
1652 | } | |
1653 | return Expression::make_string(val, imp->location()); | |
1654 | } | |
1655 | ||
d751bb78 | 1656 | // Ast dump for string expression. |
1657 | ||
1658 | void | |
1659 | String_expression::do_dump_expression(Ast_dump_context* ast_dump_context) const | |
1660 | { | |
8b1c301d | 1661 | String_expression::export_string(ast_dump_context, this); |
d751bb78 | 1662 | } |
1663 | ||
e440a328 | 1664 | // Make a string expression. |
1665 | ||
1666 | Expression* | |
b13c66cd | 1667 | Expression::make_string(const std::string& val, Location location) |
e440a328 | 1668 | { |
1669 | return new String_expression(val, location); | |
1670 | } | |
1671 | ||
2c809f8f | 1672 | // An expression that evaluates to some characteristic of a string. |
1673 | // This is used when indexing, bound-checking, or nil checking a string. | |
1674 | ||
1675 | class String_info_expression : public Expression | |
1676 | { | |
1677 | public: | |
1678 | String_info_expression(Expression* string, String_info string_info, | |
1679 | Location location) | |
1680 | : Expression(EXPRESSION_STRING_INFO, location), | |
1681 | string_(string), string_info_(string_info) | |
1682 | { } | |
1683 | ||
1684 | protected: | |
1685 | Type* | |
1686 | do_type(); | |
1687 | ||
1688 | void | |
1689 | do_determine_type(const Type_context*) | |
1690 | { go_unreachable(); } | |
1691 | ||
1692 | Expression* | |
1693 | do_copy() | |
1694 | { | |
1695 | return new String_info_expression(this->string_->copy(), this->string_info_, | |
1696 | this->location()); | |
1697 | } | |
1698 | ||
ea664253 | 1699 | Bexpression* |
1700 | do_get_backend(Translate_context* context); | |
2c809f8f | 1701 | |
1702 | void | |
1703 | do_dump_expression(Ast_dump_context*) const; | |
1704 | ||
1705 | void | |
1706 | do_issue_nil_check() | |
1707 | { this->string_->issue_nil_check(); } | |
1708 | ||
1709 | private: | |
1710 | // The string for which we are getting information. | |
1711 | Expression* string_; | |
1712 | // What information we want. | |
1713 | String_info string_info_; | |
1714 | }; | |
1715 | ||
1716 | // Return the type of the string info. | |
1717 | ||
1718 | Type* | |
1719 | String_info_expression::do_type() | |
1720 | { | |
1721 | switch (this->string_info_) | |
1722 | { | |
1723 | case STRING_INFO_DATA: | |
1724 | { | |
1725 | Type* byte_type = Type::lookup_integer_type("uint8"); | |
1726 | return Type::make_pointer_type(byte_type); | |
1727 | } | |
1728 | case STRING_INFO_LENGTH: | |
1729 | return Type::lookup_integer_type("int"); | |
1730 | default: | |
1731 | go_unreachable(); | |
1732 | } | |
1733 | } | |
1734 | ||
1735 | // Return string information in GENERIC. | |
1736 | ||
ea664253 | 1737 | Bexpression* |
1738 | String_info_expression::do_get_backend(Translate_context* context) | |
2c809f8f | 1739 | { |
1740 | Gogo* gogo = context->gogo(); | |
1741 | ||
ea664253 | 1742 | Bexpression* bstring = this->string_->get_backend(context); |
2c809f8f | 1743 | switch (this->string_info_) |
1744 | { | |
1745 | case STRING_INFO_DATA: | |
1746 | case STRING_INFO_LENGTH: | |
ea664253 | 1747 | return gogo->backend()->struct_field_expression(bstring, |
1748 | this->string_info_, | |
1749 | this->location()); | |
2c809f8f | 1750 | break; |
1751 | default: | |
1752 | go_unreachable(); | |
1753 | } | |
2c809f8f | 1754 | } |
1755 | ||
1756 | // Dump ast representation for a type info expression. | |
1757 | ||
1758 | void | |
1759 | String_info_expression::do_dump_expression( | |
1760 | Ast_dump_context* ast_dump_context) const | |
1761 | { | |
1762 | ast_dump_context->ostream() << "stringinfo("; | |
1763 | this->string_->dump_expression(ast_dump_context); | |
1764 | ast_dump_context->ostream() << ","; | |
1765 | ast_dump_context->ostream() << | |
1766 | (this->string_info_ == STRING_INFO_DATA ? "data" | |
1767 | : this->string_info_ == STRING_INFO_LENGTH ? "length" | |
1768 | : "unknown"); | |
1769 | ast_dump_context->ostream() << ")"; | |
1770 | } | |
1771 | ||
1772 | // Make a string info expression. | |
1773 | ||
1774 | Expression* | |
1775 | Expression::make_string_info(Expression* string, String_info string_info, | |
1776 | Location location) | |
1777 | { | |
1778 | return new String_info_expression(string, string_info, location); | |
1779 | } | |
1780 | ||
e440a328 | 1781 | // Make an integer expression. |
1782 | ||
1783 | class Integer_expression : public Expression | |
1784 | { | |
1785 | public: | |
5d4b8566 | 1786 | Integer_expression(const mpz_t* val, Type* type, bool is_character_constant, |
1787 | Location location) | |
e440a328 | 1788 | : Expression(EXPRESSION_INTEGER, location), |
5d4b8566 | 1789 | type_(type), is_character_constant_(is_character_constant) |
e440a328 | 1790 | { mpz_init_set(this->val_, *val); } |
1791 | ||
1792 | static Expression* | |
1793 | do_import(Import*); | |
1794 | ||
8b1c301d | 1795 | // Write VAL to string dump. |
e440a328 | 1796 | static void |
8b1c301d | 1797 | export_integer(String_dump* exp, const mpz_t val); |
e440a328 | 1798 | |
d751bb78 | 1799 | // Write VAL to dump context. |
1800 | static void | |
1801 | dump_integer(Ast_dump_context* ast_dump_context, const mpz_t val); | |
1802 | ||
e440a328 | 1803 | protected: |
1804 | bool | |
1805 | do_is_constant() const | |
1806 | { return true; } | |
1807 | ||
0e168074 | 1808 | bool |
1809 | do_is_immutable() const | |
1810 | { return true; } | |
1811 | ||
e440a328 | 1812 | bool |
0c77715b | 1813 | do_numeric_constant_value(Numeric_constant* nc) const; |
e440a328 | 1814 | |
1815 | Type* | |
1816 | do_type(); | |
1817 | ||
1818 | void | |
1819 | do_determine_type(const Type_context* context); | |
1820 | ||
1821 | void | |
1822 | do_check_types(Gogo*); | |
1823 | ||
ea664253 | 1824 | Bexpression* |
1825 | do_get_backend(Translate_context*); | |
e440a328 | 1826 | |
1827 | Expression* | |
1828 | do_copy() | |
5d4b8566 | 1829 | { |
1830 | if (this->is_character_constant_) | |
1831 | return Expression::make_character(&this->val_, this->type_, | |
1832 | this->location()); | |
1833 | else | |
e67508fa | 1834 | return Expression::make_integer_z(&this->val_, this->type_, |
1835 | this->location()); | |
5d4b8566 | 1836 | } |
e440a328 | 1837 | |
1838 | void | |
1839 | do_export(Export*) const; | |
1840 | ||
d751bb78 | 1841 | void |
1842 | do_dump_expression(Ast_dump_context*) const; | |
1843 | ||
e440a328 | 1844 | private: |
1845 | // The integer value. | |
1846 | mpz_t val_; | |
1847 | // The type so far. | |
1848 | Type* type_; | |
5d4b8566 | 1849 | // Whether this is a character constant. |
1850 | bool is_character_constant_; | |
e440a328 | 1851 | }; |
1852 | ||
0c77715b | 1853 | // Return a numeric constant for this expression. We have to mark |
1854 | // this as a character when appropriate. | |
e440a328 | 1855 | |
1856 | bool | |
0c77715b | 1857 | Integer_expression::do_numeric_constant_value(Numeric_constant* nc) const |
e440a328 | 1858 | { |
0c77715b | 1859 | if (this->is_character_constant_) |
1860 | nc->set_rune(this->type_, this->val_); | |
1861 | else | |
1862 | nc->set_int(this->type_, this->val_); | |
e440a328 | 1863 | return true; |
1864 | } | |
1865 | ||
1866 | // Return the current type. If we haven't set the type yet, we return | |
1867 | // an abstract integer type. | |
1868 | ||
1869 | Type* | |
1870 | Integer_expression::do_type() | |
1871 | { | |
1872 | if (this->type_ == NULL) | |
5d4b8566 | 1873 | { |
1874 | if (this->is_character_constant_) | |
1875 | this->type_ = Type::make_abstract_character_type(); | |
1876 | else | |
1877 | this->type_ = Type::make_abstract_integer_type(); | |
1878 | } | |
e440a328 | 1879 | return this->type_; |
1880 | } | |
1881 | ||
1882 | // Set the type of the integer value. Here we may switch from an | |
1883 | // abstract type to a real type. | |
1884 | ||
1885 | void | |
1886 | Integer_expression::do_determine_type(const Type_context* context) | |
1887 | { | |
1888 | if (this->type_ != NULL && !this->type_->is_abstract()) | |
1889 | ; | |
0c77715b | 1890 | else if (context->type != NULL && context->type->is_numeric_type()) |
e440a328 | 1891 | this->type_ = context->type; |
1892 | else if (!context->may_be_abstract) | |
5d4b8566 | 1893 | { |
1894 | if (this->is_character_constant_) | |
1895 | this->type_ = Type::lookup_integer_type("int32"); | |
1896 | else | |
1897 | this->type_ = Type::lookup_integer_type("int"); | |
1898 | } | |
e440a328 | 1899 | } |
1900 | ||
e440a328 | 1901 | // Check the type of an integer constant. |
1902 | ||
1903 | void | |
1904 | Integer_expression::do_check_types(Gogo*) | |
1905 | { | |
0c77715b | 1906 | Type* type = this->type_; |
1907 | if (type == NULL) | |
e440a328 | 1908 | return; |
0c77715b | 1909 | Numeric_constant nc; |
1910 | if (this->is_character_constant_) | |
1911 | nc.set_rune(NULL, this->val_); | |
1912 | else | |
1913 | nc.set_int(NULL, this->val_); | |
1914 | if (!nc.set_type(type, true, this->location())) | |
e440a328 | 1915 | this->set_is_error(); |
1916 | } | |
1917 | ||
ea664253 | 1918 | // Get the backend representation for an integer constant. |
e440a328 | 1919 | |
ea664253 | 1920 | Bexpression* |
1921 | Integer_expression::do_get_backend(Translate_context* context) | |
e440a328 | 1922 | { |
12373dd5 | 1923 | if (this->is_error_expression() |
1924 | || (this->type_ != NULL && this->type_->is_error_type())) | |
1925 | { | |
1926 | go_assert(saw_errors()); | |
1927 | return context->gogo()->backend()->error_expression(); | |
1928 | } | |
1929 | ||
48c2a53a | 1930 | Type* resolved_type = NULL; |
e440a328 | 1931 | if (this->type_ != NULL && !this->type_->is_abstract()) |
48c2a53a | 1932 | resolved_type = this->type_; |
e440a328 | 1933 | else if (this->type_ != NULL && this->type_->float_type() != NULL) |
1934 | { | |
1935 | // We are converting to an abstract floating point type. | |
48c2a53a | 1936 | resolved_type = Type::lookup_float_type("float64"); |
e440a328 | 1937 | } |
1938 | else if (this->type_ != NULL && this->type_->complex_type() != NULL) | |
1939 | { | |
1940 | // We are converting to an abstract complex type. | |
48c2a53a | 1941 | resolved_type = Type::lookup_complex_type("complex128"); |
e440a328 | 1942 | } |
1943 | else | |
1944 | { | |
1945 | // If we still have an abstract type here, then this is being | |
1946 | // used in a constant expression which didn't get reduced for | |
1947 | // some reason. Use a type which will fit the value. We use <, | |
1948 | // not <=, because we need an extra bit for the sign bit. | |
1949 | int bits = mpz_sizeinbase(this->val_, 2); | |
1b1f2abf | 1950 | Type* int_type = Type::lookup_integer_type("int"); |
1951 | if (bits < int_type->integer_type()->bits()) | |
48c2a53a | 1952 | resolved_type = int_type; |
e440a328 | 1953 | else if (bits < 64) |
48c2a53a | 1954 | resolved_type = Type::lookup_integer_type("int64"); |
e440a328 | 1955 | else |
48c2a53a | 1956 | { |
1957 | if (!saw_errors()) | |
1958 | error_at(this->location(), | |
1959 | "unknown type for large integer constant"); | |
ea664253 | 1960 | return context->gogo()->backend()->error_expression(); |
48c2a53a | 1961 | } |
e440a328 | 1962 | } |
48c2a53a | 1963 | Numeric_constant nc; |
1964 | nc.set_int(resolved_type, this->val_); | |
ea664253 | 1965 | return Expression::backend_numeric_constant_expression(context, &nc); |
e440a328 | 1966 | } |
1967 | ||
1968 | // Write VAL to export data. | |
1969 | ||
1970 | void | |
8b1c301d | 1971 | Integer_expression::export_integer(String_dump* exp, const mpz_t val) |
e440a328 | 1972 | { |
1973 | char* s = mpz_get_str(NULL, 10, val); | |
1974 | exp->write_c_string(s); | |
1975 | free(s); | |
1976 | } | |
1977 | ||
1978 | // Export an integer in a constant expression. | |
1979 | ||
1980 | void | |
1981 | Integer_expression::do_export(Export* exp) const | |
1982 | { | |
1983 | Integer_expression::export_integer(exp, this->val_); | |
5d4b8566 | 1984 | if (this->is_character_constant_) |
1985 | exp->write_c_string("'"); | |
e440a328 | 1986 | // A trailing space lets us reliably identify the end of the number. |
1987 | exp->write_c_string(" "); | |
1988 | } | |
1989 | ||
1990 | // Import an integer, floating point, or complex value. This handles | |
1991 | // all these types because they all start with digits. | |
1992 | ||
1993 | Expression* | |
1994 | Integer_expression::do_import(Import* imp) | |
1995 | { | |
1996 | std::string num = imp->read_identifier(); | |
1997 | imp->require_c_string(" "); | |
1998 | if (!num.empty() && num[num.length() - 1] == 'i') | |
1999 | { | |
2000 | mpfr_t real; | |
2001 | size_t plus_pos = num.find('+', 1); | |
2002 | size_t minus_pos = num.find('-', 1); | |
2003 | size_t pos; | |
2004 | if (plus_pos == std::string::npos) | |
2005 | pos = minus_pos; | |
2006 | else if (minus_pos == std::string::npos) | |
2007 | pos = plus_pos; | |
2008 | else | |
2009 | { | |
2010 | error_at(imp->location(), "bad number in import data: %qs", | |
2011 | num.c_str()); | |
2012 | return Expression::make_error(imp->location()); | |
2013 | } | |
2014 | if (pos == std::string::npos) | |
2015 | mpfr_set_ui(real, 0, GMP_RNDN); | |
2016 | else | |
2017 | { | |
2018 | std::string real_str = num.substr(0, pos); | |
2019 | if (mpfr_init_set_str(real, real_str.c_str(), 10, GMP_RNDN) != 0) | |
2020 | { | |
2021 | error_at(imp->location(), "bad number in import data: %qs", | |
2022 | real_str.c_str()); | |
2023 | return Expression::make_error(imp->location()); | |
2024 | } | |
2025 | } | |
2026 | ||
2027 | std::string imag_str; | |
2028 | if (pos == std::string::npos) | |
2029 | imag_str = num; | |
2030 | else | |
2031 | imag_str = num.substr(pos); | |
2032 | imag_str = imag_str.substr(0, imag_str.size() - 1); | |
2033 | mpfr_t imag; | |
2034 | if (mpfr_init_set_str(imag, imag_str.c_str(), 10, GMP_RNDN) != 0) | |
2035 | { | |
2036 | error_at(imp->location(), "bad number in import data: %qs", | |
2037 | imag_str.c_str()); | |
2038 | return Expression::make_error(imp->location()); | |
2039 | } | |
fcbea5e4 | 2040 | mpc_t cval; |
2041 | mpc_init2(cval, mpc_precision); | |
2042 | mpc_set_fr_fr(cval, real, imag, MPC_RNDNN); | |
e440a328 | 2043 | mpfr_clear(real); |
2044 | mpfr_clear(imag); | |
fcbea5e4 | 2045 | Expression* ret = Expression::make_complex(&cval, NULL, imp->location()); |
2046 | mpc_clear(cval); | |
e440a328 | 2047 | return ret; |
2048 | } | |
2049 | else if (num.find('.') == std::string::npos | |
2050 | && num.find('E') == std::string::npos) | |
2051 | { | |
5d4b8566 | 2052 | bool is_character_constant = (!num.empty() |
2053 | && num[num.length() - 1] == '\''); | |
2054 | if (is_character_constant) | |
2055 | num = num.substr(0, num.length() - 1); | |
e440a328 | 2056 | mpz_t val; |
2057 | if (mpz_init_set_str(val, num.c_str(), 10) != 0) | |
2058 | { | |
2059 | error_at(imp->location(), "bad number in import data: %qs", | |
2060 | num.c_str()); | |
2061 | return Expression::make_error(imp->location()); | |
2062 | } | |
5d4b8566 | 2063 | Expression* ret; |
2064 | if (is_character_constant) | |
2065 | ret = Expression::make_character(&val, NULL, imp->location()); | |
2066 | else | |
e67508fa | 2067 | ret = Expression::make_integer_z(&val, NULL, imp->location()); |
e440a328 | 2068 | mpz_clear(val); |
2069 | return ret; | |
2070 | } | |
2071 | else | |
2072 | { | |
2073 | mpfr_t val; | |
2074 | if (mpfr_init_set_str(val, num.c_str(), 10, GMP_RNDN) != 0) | |
2075 | { | |
2076 | error_at(imp->location(), "bad number in import data: %qs", | |
2077 | num.c_str()); | |
2078 | return Expression::make_error(imp->location()); | |
2079 | } | |
2080 | Expression* ret = Expression::make_float(&val, NULL, imp->location()); | |
2081 | mpfr_clear(val); | |
2082 | return ret; | |
2083 | } | |
2084 | } | |
d751bb78 | 2085 | // Ast dump for integer expression. |
2086 | ||
2087 | void | |
2088 | Integer_expression::do_dump_expression(Ast_dump_context* ast_dump_context) const | |
2089 | { | |
5d4b8566 | 2090 | if (this->is_character_constant_) |
2091 | ast_dump_context->ostream() << '\''; | |
8b1c301d | 2092 | Integer_expression::export_integer(ast_dump_context, this->val_); |
5d4b8566 | 2093 | if (this->is_character_constant_) |
2094 | ast_dump_context->ostream() << '\''; | |
d751bb78 | 2095 | } |
2096 | ||
e67508fa | 2097 | // Build a new integer value from a multi-precision integer. |
e440a328 | 2098 | |
2099 | Expression* | |
e67508fa | 2100 | Expression::make_integer_z(const mpz_t* val, Type* type, Location location) |
5d4b8566 | 2101 | { |
2102 | return new Integer_expression(val, type, false, location); | |
2103 | } | |
2104 | ||
e67508fa | 2105 | // Build a new integer value from an unsigned long. |
2106 | ||
2107 | Expression* | |
2108 | Expression::make_integer_ul(unsigned long val, Type *type, Location location) | |
2109 | { | |
2110 | mpz_t zval; | |
2111 | mpz_init_set_ui(zval, val); | |
2112 | Expression* ret = Expression::make_integer_z(&zval, type, location); | |
2113 | mpz_clear(zval); | |
2114 | return ret; | |
2115 | } | |
2116 | ||
2117 | // Build a new integer value from a signed long. | |
2118 | ||
2119 | Expression* | |
2120 | Expression::make_integer_sl(long val, Type *type, Location location) | |
2121 | { | |
2122 | mpz_t zval; | |
2123 | mpz_init_set_si(zval, val); | |
2124 | Expression* ret = Expression::make_integer_z(&zval, type, location); | |
2125 | mpz_clear(zval); | |
2126 | return ret; | |
2127 | } | |
2128 | ||
3f378015 | 2129 | // Store an int64_t in an uninitialized mpz_t. |
2130 | ||
2131 | static void | |
2132 | set_mpz_from_int64(mpz_t* zval, int64_t val) | |
2133 | { | |
2134 | if (val >= 0) | |
2135 | { | |
2136 | unsigned long ul = static_cast<unsigned long>(val); | |
2137 | if (static_cast<int64_t>(ul) == val) | |
2138 | { | |
2139 | mpz_init_set_ui(*zval, ul); | |
2140 | return; | |
2141 | } | |
2142 | } | |
2143 | uint64_t uv; | |
2144 | if (val >= 0) | |
2145 | uv = static_cast<uint64_t>(val); | |
2146 | else | |
2147 | uv = static_cast<uint64_t>(- val); | |
2148 | unsigned long ul = uv & 0xffffffffUL; | |
2149 | mpz_init_set_ui(*zval, ul); | |
2150 | mpz_t hval; | |
2151 | mpz_init_set_ui(hval, static_cast<unsigned long>(uv >> 32)); | |
2152 | mpz_mul_2exp(hval, hval, 32); | |
2153 | mpz_add(*zval, *zval, hval); | |
2154 | mpz_clear(hval); | |
2155 | if (val < 0) | |
2156 | mpz_neg(*zval, *zval); | |
2157 | } | |
2158 | ||
2159 | // Build a new integer value from an int64_t. | |
2160 | ||
2161 | Expression* | |
2162 | Expression::make_integer_int64(int64_t val, Type* type, Location location) | |
2163 | { | |
2164 | mpz_t zval; | |
2165 | set_mpz_from_int64(&zval, val); | |
2166 | Expression* ret = Expression::make_integer_z(&zval, type, location); | |
2167 | mpz_clear(zval); | |
2168 | return ret; | |
2169 | } | |
2170 | ||
5d4b8566 | 2171 | // Build a new character constant value. |
2172 | ||
2173 | Expression* | |
2174 | Expression::make_character(const mpz_t* val, Type* type, Location location) | |
e440a328 | 2175 | { |
5d4b8566 | 2176 | return new Integer_expression(val, type, true, location); |
e440a328 | 2177 | } |
2178 | ||
2179 | // Floats. | |
2180 | ||
2181 | class Float_expression : public Expression | |
2182 | { | |
2183 | public: | |
b13c66cd | 2184 | Float_expression(const mpfr_t* val, Type* type, Location location) |
e440a328 | 2185 | : Expression(EXPRESSION_FLOAT, location), |
2186 | type_(type) | |
2187 | { | |
2188 | mpfr_init_set(this->val_, *val, GMP_RNDN); | |
2189 | } | |
2190 | ||
e440a328 | 2191 | // Write VAL to export data. |
2192 | static void | |
8b1c301d | 2193 | export_float(String_dump* exp, const mpfr_t val); |
2194 | ||
d751bb78 | 2195 | // Write VAL to dump file. |
2196 | static void | |
2197 | dump_float(Ast_dump_context* ast_dump_context, const mpfr_t val); | |
e440a328 | 2198 | |
2199 | protected: | |
2200 | bool | |
2201 | do_is_constant() const | |
2202 | { return true; } | |
2203 | ||
0e168074 | 2204 | bool |
2205 | do_is_immutable() const | |
2206 | { return true; } | |
2207 | ||
e440a328 | 2208 | bool |
0c77715b | 2209 | do_numeric_constant_value(Numeric_constant* nc) const |
2210 | { | |
2211 | nc->set_float(this->type_, this->val_); | |
2212 | return true; | |
2213 | } | |
e440a328 | 2214 | |
2215 | Type* | |
2216 | do_type(); | |
2217 | ||
2218 | void | |
2219 | do_determine_type(const Type_context*); | |
2220 | ||
2221 | void | |
2222 | do_check_types(Gogo*); | |
2223 | ||
2224 | Expression* | |
2225 | do_copy() | |
2226 | { return Expression::make_float(&this->val_, this->type_, | |
2227 | this->location()); } | |
2228 | ||
ea664253 | 2229 | Bexpression* |
2230 | do_get_backend(Translate_context*); | |
e440a328 | 2231 | |
2232 | void | |
2233 | do_export(Export*) const; | |
2234 | ||
d751bb78 | 2235 | void |
2236 | do_dump_expression(Ast_dump_context*) const; | |
2237 | ||
e440a328 | 2238 | private: |
2239 | // The floating point value. | |
2240 | mpfr_t val_; | |
2241 | // The type so far. | |
2242 | Type* type_; | |
2243 | }; | |
2244 | ||
e440a328 | 2245 | // Return the current type. If we haven't set the type yet, we return |
2246 | // an abstract float type. | |
2247 | ||
2248 | Type* | |
2249 | Float_expression::do_type() | |
2250 | { | |
2251 | if (this->type_ == NULL) | |
2252 | this->type_ = Type::make_abstract_float_type(); | |
2253 | return this->type_; | |
2254 | } | |
2255 | ||
2256 | // Set the type of the float value. Here we may switch from an | |
2257 | // abstract type to a real type. | |
2258 | ||
2259 | void | |
2260 | Float_expression::do_determine_type(const Type_context* context) | |
2261 | { | |
2262 | if (this->type_ != NULL && !this->type_->is_abstract()) | |
2263 | ; | |
2264 | else if (context->type != NULL | |
2265 | && (context->type->integer_type() != NULL | |
2266 | || context->type->float_type() != NULL | |
2267 | || context->type->complex_type() != NULL)) | |
2268 | this->type_ = context->type; | |
2269 | else if (!context->may_be_abstract) | |
48080209 | 2270 | this->type_ = Type::lookup_float_type("float64"); |
e440a328 | 2271 | } |
2272 | ||
e440a328 | 2273 | // Check the type of a float value. |
2274 | ||
2275 | void | |
2276 | Float_expression::do_check_types(Gogo*) | |
2277 | { | |
0c77715b | 2278 | Type* type = this->type_; |
2279 | if (type == NULL) | |
e440a328 | 2280 | return; |
0c77715b | 2281 | Numeric_constant nc; |
2282 | nc.set_float(NULL, this->val_); | |
2283 | if (!nc.set_type(this->type_, true, this->location())) | |
e440a328 | 2284 | this->set_is_error(); |
e440a328 | 2285 | } |
2286 | ||
ea664253 | 2287 | // Get the backend representation for a float constant. |
e440a328 | 2288 | |
ea664253 | 2289 | Bexpression* |
2290 | Float_expression::do_get_backend(Translate_context* context) | |
e440a328 | 2291 | { |
12373dd5 | 2292 | if (this->is_error_expression() |
2293 | || (this->type_ != NULL && this->type_->is_error_type())) | |
2294 | { | |
2295 | go_assert(saw_errors()); | |
2296 | return context->gogo()->backend()->error_expression(); | |
2297 | } | |
2298 | ||
48c2a53a | 2299 | Type* resolved_type; |
e440a328 | 2300 | if (this->type_ != NULL && !this->type_->is_abstract()) |
48c2a53a | 2301 | resolved_type = this->type_; |
e440a328 | 2302 | else if (this->type_ != NULL && this->type_->integer_type() != NULL) |
2303 | { | |
2304 | // We have an abstract integer type. We just hope for the best. | |
48c2a53a | 2305 | resolved_type = Type::lookup_integer_type("int"); |
2306 | } | |
2307 | else if (this->type_ != NULL && this->type_->complex_type() != NULL) | |
2308 | { | |
2309 | // We are converting to an abstract complex type. | |
2310 | resolved_type = Type::lookup_complex_type("complex128"); | |
e440a328 | 2311 | } |
2312 | else | |
2313 | { | |
2314 | // If we still have an abstract type here, then this is being | |
2315 | // used in a constant expression which didn't get reduced. We | |
2316 | // just use float64 and hope for the best. | |
48c2a53a | 2317 | resolved_type = Type::lookup_float_type("float64"); |
e440a328 | 2318 | } |
48c2a53a | 2319 | |
2320 | Numeric_constant nc; | |
2321 | nc.set_float(resolved_type, this->val_); | |
ea664253 | 2322 | return Expression::backend_numeric_constant_expression(context, &nc); |
e440a328 | 2323 | } |
2324 | ||
8b1c301d | 2325 | // Write a floating point number to a string dump. |
e440a328 | 2326 | |
2327 | void | |
8b1c301d | 2328 | Float_expression::export_float(String_dump *exp, const mpfr_t val) |
e440a328 | 2329 | { |
2330 | mp_exp_t exponent; | |
2331 | char* s = mpfr_get_str(NULL, &exponent, 10, 0, val, GMP_RNDN); | |
2332 | if (*s == '-') | |
2333 | exp->write_c_string("-"); | |
2334 | exp->write_c_string("0."); | |
2335 | exp->write_c_string(*s == '-' ? s + 1 : s); | |
2336 | mpfr_free_str(s); | |
2337 | char buf[30]; | |
2338 | snprintf(buf, sizeof buf, "E%ld", exponent); | |
2339 | exp->write_c_string(buf); | |
2340 | } | |
2341 | ||
2342 | // Export a floating point number in a constant expression. | |
2343 | ||
2344 | void | |
2345 | Float_expression::do_export(Export* exp) const | |
2346 | { | |
2347 | Float_expression::export_float(exp, this->val_); | |
2348 | // A trailing space lets us reliably identify the end of the number. | |
2349 | exp->write_c_string(" "); | |
2350 | } | |
2351 | ||
d751bb78 | 2352 | // Dump a floating point number to the dump file. |
2353 | ||
2354 | void | |
2355 | Float_expression::do_dump_expression(Ast_dump_context* ast_dump_context) const | |
2356 | { | |
8b1c301d | 2357 | Float_expression::export_float(ast_dump_context, this->val_); |
d751bb78 | 2358 | } |
2359 | ||
e440a328 | 2360 | // Make a float expression. |
2361 | ||
2362 | Expression* | |
b13c66cd | 2363 | Expression::make_float(const mpfr_t* val, Type* type, Location location) |
e440a328 | 2364 | { |
2365 | return new Float_expression(val, type, location); | |
2366 | } | |
2367 | ||
2368 | // Complex numbers. | |
2369 | ||
2370 | class Complex_expression : public Expression | |
2371 | { | |
2372 | public: | |
fcbea5e4 | 2373 | Complex_expression(const mpc_t* val, Type* type, Location location) |
e440a328 | 2374 | : Expression(EXPRESSION_COMPLEX, location), |
2375 | type_(type) | |
2376 | { | |
fcbea5e4 | 2377 | mpc_init2(this->val_, mpc_precision); |
2378 | mpc_set(this->val_, *val, MPC_RNDNN); | |
e440a328 | 2379 | } |
2380 | ||
fcbea5e4 | 2381 | // Write VAL to string dump. |
e440a328 | 2382 | static void |
fcbea5e4 | 2383 | export_complex(String_dump* exp, const mpc_t val); |
e440a328 | 2384 | |
d751bb78 | 2385 | // Write REAL/IMAG to dump context. |
2386 | static void | |
fcbea5e4 | 2387 | dump_complex(Ast_dump_context* ast_dump_context, const mpc_t val); |
d751bb78 | 2388 | |
e440a328 | 2389 | protected: |
2390 | bool | |
2391 | do_is_constant() const | |
2392 | { return true; } | |
2393 | ||
0e168074 | 2394 | bool |
2395 | do_is_immutable() const | |
2396 | { return true; } | |
2397 | ||
e440a328 | 2398 | bool |
0c77715b | 2399 | do_numeric_constant_value(Numeric_constant* nc) const |
2400 | { | |
fcbea5e4 | 2401 | nc->set_complex(this->type_, this->val_); |
0c77715b | 2402 | return true; |
2403 | } | |
e440a328 | 2404 | |
2405 | Type* | |
2406 | do_type(); | |
2407 | ||
2408 | void | |
2409 | do_determine_type(const Type_context*); | |
2410 | ||
2411 | void | |
2412 | do_check_types(Gogo*); | |
2413 | ||
2414 | Expression* | |
2415 | do_copy() | |
2416 | { | |
fcbea5e4 | 2417 | return Expression::make_complex(&this->val_, this->type_, |
e440a328 | 2418 | this->location()); |
2419 | } | |
2420 | ||
ea664253 | 2421 | Bexpression* |
2422 | do_get_backend(Translate_context*); | |
e440a328 | 2423 | |
2424 | void | |
2425 | do_export(Export*) const; | |
2426 | ||
d751bb78 | 2427 | void |
2428 | do_dump_expression(Ast_dump_context*) const; | |
abd26de0 | 2429 | |
e440a328 | 2430 | private: |
fcbea5e4 | 2431 | // The complex value. |
2432 | mpc_t val_; | |
e440a328 | 2433 | // The type if known. |
2434 | Type* type_; | |
2435 | }; | |
2436 | ||
e440a328 | 2437 | // Return the current type. If we haven't set the type yet, we return |
2438 | // an abstract complex type. | |
2439 | ||
2440 | Type* | |
2441 | Complex_expression::do_type() | |
2442 | { | |
2443 | if (this->type_ == NULL) | |
2444 | this->type_ = Type::make_abstract_complex_type(); | |
2445 | return this->type_; | |
2446 | } | |
2447 | ||
2448 | // Set the type of the complex value. Here we may switch from an | |
2449 | // abstract type to a real type. | |
2450 | ||
2451 | void | |
2452 | Complex_expression::do_determine_type(const Type_context* context) | |
2453 | { | |
2454 | if (this->type_ != NULL && !this->type_->is_abstract()) | |
2455 | ; | |
abd26de0 | 2456 | else if (context->type != NULL && context->type->is_numeric_type()) |
e440a328 | 2457 | this->type_ = context->type; |
2458 | else if (!context->may_be_abstract) | |
48080209 | 2459 | this->type_ = Type::lookup_complex_type("complex128"); |
e440a328 | 2460 | } |
2461 | ||
e440a328 | 2462 | // Check the type of a complex value. |
2463 | ||
2464 | void | |
2465 | Complex_expression::do_check_types(Gogo*) | |
2466 | { | |
0c77715b | 2467 | Type* type = this->type_; |
2468 | if (type == NULL) | |
e440a328 | 2469 | return; |
0c77715b | 2470 | Numeric_constant nc; |
fcbea5e4 | 2471 | nc.set_complex(NULL, this->val_); |
0c77715b | 2472 | if (!nc.set_type(this->type_, true, this->location())) |
e440a328 | 2473 | this->set_is_error(); |
2474 | } | |
2475 | ||
ea664253 | 2476 | // Get the backend representation for a complex constant. |
e440a328 | 2477 | |
ea664253 | 2478 | Bexpression* |
2479 | Complex_expression::do_get_backend(Translate_context* context) | |
e440a328 | 2480 | { |
12373dd5 | 2481 | if (this->is_error_expression() |
2482 | || (this->type_ != NULL && this->type_->is_error_type())) | |
2483 | { | |
2484 | go_assert(saw_errors()); | |
2485 | return context->gogo()->backend()->error_expression(); | |
2486 | } | |
2487 | ||
48c2a53a | 2488 | Type* resolved_type; |
e440a328 | 2489 | if (this->type_ != NULL && !this->type_->is_abstract()) |
48c2a53a | 2490 | resolved_type = this->type_; |
2491 | else if (this->type_ != NULL && this->type_->integer_type() != NULL) | |
2492 | { | |
2493 | // We are converting to an abstract integer type. | |
2494 | resolved_type = Type::lookup_integer_type("int"); | |
2495 | } | |
2496 | else if (this->type_ != NULL && this->type_->float_type() != NULL) | |
2497 | { | |
2498 | // We are converting to an abstract float type. | |
2499 | resolved_type = Type::lookup_float_type("float64"); | |
2500 | } | |
e440a328 | 2501 | else |
2502 | { | |
47ae02b7 | 2503 | // If we still have an abstract type here, this is being |
e440a328 | 2504 | // used in a constant expression which didn't get reduced. We |
2505 | // just use complex128 and hope for the best. | |
48c2a53a | 2506 | resolved_type = Type::lookup_complex_type("complex128"); |
e440a328 | 2507 | } |
48c2a53a | 2508 | |
2509 | Numeric_constant nc; | |
fcbea5e4 | 2510 | nc.set_complex(resolved_type, this->val_); |
ea664253 | 2511 | return Expression::backend_numeric_constant_expression(context, &nc); |
e440a328 | 2512 | } |
2513 | ||
2514 | // Write REAL/IMAG to export data. | |
2515 | ||
2516 | void | |
fcbea5e4 | 2517 | Complex_expression::export_complex(String_dump* exp, const mpc_t val) |
e440a328 | 2518 | { |
fcbea5e4 | 2519 | if (!mpfr_zero_p(mpc_realref(val))) |
e440a328 | 2520 | { |
fcbea5e4 | 2521 | Float_expression::export_float(exp, mpc_realref(val)); |
d1db782d | 2522 | if (mpfr_sgn(mpc_imagref(val)) >= 0) |
e440a328 | 2523 | exp->write_c_string("+"); |
2524 | } | |
fcbea5e4 | 2525 | Float_expression::export_float(exp, mpc_imagref(val)); |
e440a328 | 2526 | exp->write_c_string("i"); |
2527 | } | |
2528 | ||
2529 | // Export a complex number in a constant expression. | |
2530 | ||
2531 | void | |
2532 | Complex_expression::do_export(Export* exp) const | |
2533 | { | |
fcbea5e4 | 2534 | Complex_expression::export_complex(exp, this->val_); |
e440a328 | 2535 | // A trailing space lets us reliably identify the end of the number. |
2536 | exp->write_c_string(" "); | |
2537 | } | |
2538 | ||
d751bb78 | 2539 | // Dump a complex expression to the dump file. |
2540 | ||
2541 | void | |
2542 | Complex_expression::do_dump_expression(Ast_dump_context* ast_dump_context) const | |
2543 | { | |
fcbea5e4 | 2544 | Complex_expression::export_complex(ast_dump_context, this->val_); |
d751bb78 | 2545 | } |
2546 | ||
e440a328 | 2547 | // Make a complex expression. |
2548 | ||
2549 | Expression* | |
fcbea5e4 | 2550 | Expression::make_complex(const mpc_t* val, Type* type, Location location) |
e440a328 | 2551 | { |
fcbea5e4 | 2552 | return new Complex_expression(val, type, location); |
e440a328 | 2553 | } |
2554 | ||
d5b605df | 2555 | // Find a named object in an expression. |
2556 | ||
2557 | class Find_named_object : public Traverse | |
2558 | { | |
2559 | public: | |
2560 | Find_named_object(Named_object* no) | |
2561 | : Traverse(traverse_expressions), | |
2562 | no_(no), found_(false) | |
2563 | { } | |
2564 | ||
2565 | // Whether we found the object. | |
2566 | bool | |
2567 | found() const | |
2568 | { return this->found_; } | |
2569 | ||
2570 | protected: | |
2571 | int | |
2572 | expression(Expression**); | |
2573 | ||
2574 | private: | |
2575 | // The object we are looking for. | |
2576 | Named_object* no_; | |
2577 | // Whether we found it. | |
2578 | bool found_; | |
2579 | }; | |
2580 | ||
e440a328 | 2581 | // A reference to a const in an expression. |
2582 | ||
2583 | class Const_expression : public Expression | |
2584 | { | |
2585 | public: | |
b13c66cd | 2586 | Const_expression(Named_object* constant, Location location) |
e440a328 | 2587 | : Expression(EXPRESSION_CONST_REFERENCE, location), |
13e818f5 | 2588 | constant_(constant), type_(NULL), seen_(false) |
e440a328 | 2589 | { } |
2590 | ||
d5b605df | 2591 | Named_object* |
2592 | named_object() | |
2593 | { return this->constant_; } | |
2594 | ||
a7f064d5 | 2595 | // Check that the initializer does not refer to the constant itself. |
2596 | void | |
2597 | check_for_init_loop(); | |
2598 | ||
e440a328 | 2599 | protected: |
ba4aedd4 | 2600 | int |
2601 | do_traverse(Traverse*); | |
2602 | ||
e440a328 | 2603 | Expression* |
ceeb4318 | 2604 | do_lower(Gogo*, Named_object*, Statement_inserter*, int); |
e440a328 | 2605 | |
2606 | bool | |
2607 | do_is_constant() const | |
2608 | { return true; } | |
2609 | ||
0e168074 | 2610 | bool |
2611 | do_is_immutable() const | |
2612 | { return true; } | |
2613 | ||
e440a328 | 2614 | bool |
0c77715b | 2615 | do_numeric_constant_value(Numeric_constant* nc) const; |
e440a328 | 2616 | |
2617 | bool | |
af6b489a | 2618 | do_string_constant_value(std::string* val) const; |
e440a328 | 2619 | |
2620 | Type* | |
2621 | do_type(); | |
2622 | ||
2623 | // The type of a const is set by the declaration, not the use. | |
2624 | void | |
2625 | do_determine_type(const Type_context*); | |
2626 | ||
2627 | void | |
2628 | do_check_types(Gogo*); | |
2629 | ||
2630 | Expression* | |
2631 | do_copy() | |
2632 | { return this; } | |
2633 | ||
ea664253 | 2634 | Bexpression* |
2635 | do_get_backend(Translate_context* context); | |
e440a328 | 2636 | |
2637 | // When exporting a reference to a const as part of a const | |
2638 | // expression, we export the value. We ignore the fact that it has | |
2639 | // a name. | |
2640 | void | |
2641 | do_export(Export* exp) const | |
2642 | { this->constant_->const_value()->expr()->export_expression(exp); } | |
2643 | ||
d751bb78 | 2644 | void |
2645 | do_dump_expression(Ast_dump_context*) const; | |
2646 | ||
e440a328 | 2647 | private: |
2648 | // The constant. | |
2649 | Named_object* constant_; | |
2650 | // The type of this reference. This is used if the constant has an | |
2651 | // abstract type. | |
2652 | Type* type_; | |
13e818f5 | 2653 | // Used to prevent infinite recursion when a constant incorrectly |
2654 | // refers to itself. | |
2655 | mutable bool seen_; | |
e440a328 | 2656 | }; |
2657 | ||
ba4aedd4 | 2658 | // Traversal. |
2659 | ||
2660 | int | |
2661 | Const_expression::do_traverse(Traverse* traverse) | |
2662 | { | |
2663 | if (this->type_ != NULL) | |
2664 | return Type::traverse(this->type_, traverse); | |
2665 | return TRAVERSE_CONTINUE; | |
2666 | } | |
2667 | ||
e440a328 | 2668 | // Lower a constant expression. This is where we convert the |
2669 | // predeclared constant iota into an integer value. | |
2670 | ||
2671 | Expression* | |
ceeb4318 | 2672 | Const_expression::do_lower(Gogo* gogo, Named_object*, |
2673 | Statement_inserter*, int iota_value) | |
e440a328 | 2674 | { |
2675 | if (this->constant_->const_value()->expr()->classification() | |
2676 | == EXPRESSION_IOTA) | |
2677 | { | |
2678 | if (iota_value == -1) | |
2679 | { | |
2680 | error_at(this->location(), | |
2681 | "iota is only defined in const declarations"); | |
2682 | iota_value = 0; | |
2683 | } | |
e67508fa | 2684 | return Expression::make_integer_ul(iota_value, NULL, this->location()); |
e440a328 | 2685 | } |
2686 | ||
2687 | // Make sure that the constant itself has been lowered. | |
2688 | gogo->lower_constant(this->constant_); | |
2689 | ||
2690 | return this; | |
2691 | } | |
2692 | ||
0c77715b | 2693 | // Return a numeric constant value. |
e440a328 | 2694 | |
2695 | bool | |
0c77715b | 2696 | Const_expression::do_numeric_constant_value(Numeric_constant* nc) const |
e440a328 | 2697 | { |
13e818f5 | 2698 | if (this->seen_) |
2699 | return false; | |
2700 | ||
e440a328 | 2701 | Expression* e = this->constant_->const_value()->expr(); |
0c77715b | 2702 | |
13e818f5 | 2703 | this->seen_ = true; |
2704 | ||
0c77715b | 2705 | bool r = e->numeric_constant_value(nc); |
e440a328 | 2706 | |
13e818f5 | 2707 | this->seen_ = false; |
2708 | ||
e440a328 | 2709 | Type* ctype; |
2710 | if (this->type_ != NULL) | |
2711 | ctype = this->type_; | |
2712 | else | |
2713 | ctype = this->constant_->const_value()->type(); | |
e440a328 | 2714 | if (r && ctype != NULL) |
2715 | { | |
0c77715b | 2716 | if (!nc->set_type(ctype, false, this->location())) |
e440a328 | 2717 | return false; |
e440a328 | 2718 | } |
e440a328 | 2719 | |
e440a328 | 2720 | return r; |
2721 | } | |
2722 | ||
af6b489a | 2723 | bool |
2724 | Const_expression::do_string_constant_value(std::string* val) const | |
2725 | { | |
2726 | if (this->seen_) | |
2727 | return false; | |
2728 | ||
2729 | Expression* e = this->constant_->const_value()->expr(); | |
2730 | ||
2731 | this->seen_ = true; | |
2732 | bool ok = e->string_constant_value(val); | |
2733 | this->seen_ = false; | |
2734 | ||
2735 | return ok; | |
2736 | } | |
2737 | ||
e440a328 | 2738 | // Return the type of the const reference. |
2739 | ||
2740 | Type* | |
2741 | Const_expression::do_type() | |
2742 | { | |
2743 | if (this->type_ != NULL) | |
2744 | return this->type_; | |
13e818f5 | 2745 | |
2f78f012 | 2746 | Named_constant* nc = this->constant_->const_value(); |
2747 | ||
2748 | if (this->seen_ || nc->lowering()) | |
13e818f5 | 2749 | { |
2750 | this->report_error(_("constant refers to itself")); | |
2751 | this->type_ = Type::make_error_type(); | |
2752 | return this->type_; | |
2753 | } | |
2754 | ||
2755 | this->seen_ = true; | |
2756 | ||
e440a328 | 2757 | Type* ret = nc->type(); |
13e818f5 | 2758 | |
e440a328 | 2759 | if (ret != NULL) |
13e818f5 | 2760 | { |
2761 | this->seen_ = false; | |
2762 | return ret; | |
2763 | } | |
2764 | ||
e440a328 | 2765 | // During parsing, a named constant may have a NULL type, but we |
2766 | // must not return a NULL type here. | |
13e818f5 | 2767 | ret = nc->expr()->type(); |
2768 | ||
2769 | this->seen_ = false; | |
2770 | ||
2771 | return ret; | |
e440a328 | 2772 | } |
2773 | ||
2774 | // Set the type of the const reference. | |
2775 | ||
2776 | void | |
2777 | Const_expression::do_determine_type(const Type_context* context) | |
2778 | { | |
2779 | Type* ctype = this->constant_->const_value()->type(); | |
2780 | Type* cetype = (ctype != NULL | |
2781 | ? ctype | |
2782 | : this->constant_->const_value()->expr()->type()); | |
2783 | if (ctype != NULL && !ctype->is_abstract()) | |
2784 | ; | |
2785 | else if (context->type != NULL | |
0c77715b | 2786 | && context->type->is_numeric_type() |
2787 | && cetype->is_numeric_type()) | |
e440a328 | 2788 | this->type_ = context->type; |
2789 | else if (context->type != NULL | |
2790 | && context->type->is_string_type() | |
2791 | && cetype->is_string_type()) | |
2792 | this->type_ = context->type; | |
2793 | else if (context->type != NULL | |
2794 | && context->type->is_boolean_type() | |
2795 | && cetype->is_boolean_type()) | |
2796 | this->type_ = context->type; | |
2797 | else if (!context->may_be_abstract) | |
2798 | { | |
2799 | if (cetype->is_abstract()) | |
2800 | cetype = cetype->make_non_abstract_type(); | |
2801 | this->type_ = cetype; | |
2802 | } | |
2803 | } | |
2804 | ||
a7f064d5 | 2805 | // Check for a loop in which the initializer of a constant refers to |
2806 | // the constant itself. | |
e440a328 | 2807 | |
2808 | void | |
a7f064d5 | 2809 | Const_expression::check_for_init_loop() |
e440a328 | 2810 | { |
5c13bd80 | 2811 | if (this->type_ != NULL && this->type_->is_error()) |
d5b605df | 2812 | return; |
2813 | ||
a7f064d5 | 2814 | if (this->seen_) |
2815 | { | |
2816 | this->report_error(_("constant refers to itself")); | |
2817 | this->type_ = Type::make_error_type(); | |
2818 | return; | |
2819 | } | |
2820 | ||
d5b605df | 2821 | Expression* init = this->constant_->const_value()->expr(); |
2822 | Find_named_object find_named_object(this->constant_); | |
a7f064d5 | 2823 | |
2824 | this->seen_ = true; | |
d5b605df | 2825 | Expression::traverse(&init, &find_named_object); |
a7f064d5 | 2826 | this->seen_ = false; |
2827 | ||
d5b605df | 2828 | if (find_named_object.found()) |
2829 | { | |
5c13bd80 | 2830 | if (this->type_ == NULL || !this->type_->is_error()) |
a7f064d5 | 2831 | { |
2832 | this->report_error(_("constant refers to itself")); | |
2833 | this->type_ = Type::make_error_type(); | |
2834 | } | |
d5b605df | 2835 | return; |
2836 | } | |
a7f064d5 | 2837 | } |
2838 | ||
2839 | // Check types of a const reference. | |
2840 | ||
2841 | void | |
2842 | Const_expression::do_check_types(Gogo*) | |
2843 | { | |
5c13bd80 | 2844 | if (this->type_ != NULL && this->type_->is_error()) |
a7f064d5 | 2845 | return; |
2846 | ||
2847 | this->check_for_init_loop(); | |
d5b605df | 2848 | |
0c77715b | 2849 | // Check that numeric constant fits in type. |
2850 | if (this->type_ != NULL && this->type_->is_numeric_type()) | |
e440a328 | 2851 | { |
0c77715b | 2852 | Numeric_constant nc; |
2853 | if (this->constant_->const_value()->expr()->numeric_constant_value(&nc)) | |
e440a328 | 2854 | { |
0c77715b | 2855 | if (!nc.set_type(this->type_, true, this->location())) |
2856 | this->set_is_error(); | |
e440a328 | 2857 | } |
e440a328 | 2858 | } |
2859 | } | |
2860 | ||
ea664253 | 2861 | // Return the backend representation for a const reference. |
e440a328 | 2862 | |
ea664253 | 2863 | Bexpression* |
2864 | Const_expression::do_get_backend(Translate_context* context) | |
e440a328 | 2865 | { |
12373dd5 | 2866 | if (this->is_error_expression() |
2867 | || (this->type_ != NULL && this->type_->is_error())) | |
2868 | { | |
2869 | go_assert(saw_errors()); | |
2870 | return context->backend()->error_expression(); | |
2871 | } | |
e440a328 | 2872 | |
2873 | // If the type has been set for this expression, but the underlying | |
2874 | // object is an abstract int or float, we try to get the abstract | |
2875 | // value. Otherwise we may lose something in the conversion. | |
f2de4532 | 2876 | Expression* expr = this->constant_->const_value()->expr(); |
e440a328 | 2877 | if (this->type_ != NULL |
0c77715b | 2878 | && this->type_->is_numeric_type() |
a68492b4 | 2879 | && (this->constant_->const_value()->type() == NULL |
2880 | || this->constant_->const_value()->type()->is_abstract())) | |
e440a328 | 2881 | { |
0c77715b | 2882 | Numeric_constant nc; |
2883 | if (expr->numeric_constant_value(&nc) | |
2884 | && nc.set_type(this->type_, false, this->location())) | |
e440a328 | 2885 | { |
0c77715b | 2886 | Expression* e = nc.expression(this->location()); |
ea664253 | 2887 | return e->get_backend(context); |
e440a328 | 2888 | } |
e440a328 | 2889 | } |
2890 | ||
2c809f8f | 2891 | if (this->type_ != NULL) |
f2de4532 | 2892 | expr = Expression::make_cast(this->type_, expr, this->location()); |
ea664253 | 2893 | return expr->get_backend(context); |
e440a328 | 2894 | } |
2895 | ||
d751bb78 | 2896 | // Dump ast representation for constant expression. |
2897 | ||
2898 | void | |
2899 | Const_expression::do_dump_expression(Ast_dump_context* ast_dump_context) const | |
2900 | { | |
2901 | ast_dump_context->ostream() << this->constant_->name(); | |
2902 | } | |
2903 | ||
e440a328 | 2904 | // Make a reference to a constant in an expression. |
2905 | ||
2906 | Expression* | |
2907 | Expression::make_const_reference(Named_object* constant, | |
b13c66cd | 2908 | Location location) |
e440a328 | 2909 | { |
2910 | return new Const_expression(constant, location); | |
2911 | } | |
2912 | ||
d5b605df | 2913 | // Find a named object in an expression. |
2914 | ||
2915 | int | |
2916 | Find_named_object::expression(Expression** pexpr) | |
2917 | { | |
2918 | switch ((*pexpr)->classification()) | |
2919 | { | |
2920 | case Expression::EXPRESSION_CONST_REFERENCE: | |
a7f064d5 | 2921 | { |
2922 | Const_expression* ce = static_cast<Const_expression*>(*pexpr); | |
2923 | if (ce->named_object() == this->no_) | |
2924 | break; | |
2925 | ||
2926 | // We need to check a constant initializer explicitly, as | |
2927 | // loops here will not be caught by the loop checking for | |
2928 | // variable initializers. | |
2929 | ce->check_for_init_loop(); | |
2930 | ||
2931 | return TRAVERSE_CONTINUE; | |
2932 | } | |
2933 | ||
d5b605df | 2934 | case Expression::EXPRESSION_VAR_REFERENCE: |
2935 | if ((*pexpr)->var_expression()->named_object() == this->no_) | |
2936 | break; | |
2937 | return TRAVERSE_CONTINUE; | |
2938 | case Expression::EXPRESSION_FUNC_REFERENCE: | |
2939 | if ((*pexpr)->func_expression()->named_object() == this->no_) | |
2940 | break; | |
2941 | return TRAVERSE_CONTINUE; | |
2942 | default: | |
2943 | return TRAVERSE_CONTINUE; | |
2944 | } | |
2945 | this->found_ = true; | |
2946 | return TRAVERSE_EXIT; | |
2947 | } | |
2948 | ||
e440a328 | 2949 | // The nil value. |
2950 | ||
2951 | class Nil_expression : public Expression | |
2952 | { | |
2953 | public: | |
b13c66cd | 2954 | Nil_expression(Location location) |
e440a328 | 2955 | : Expression(EXPRESSION_NIL, location) |
2956 | { } | |
2957 | ||
2958 | static Expression* | |
2959 | do_import(Import*); | |
2960 | ||
2961 | protected: | |
2962 | bool | |
2963 | do_is_constant() const | |
2964 | { return true; } | |
2965 | ||
f9ca30f9 | 2966 | bool |
2967 | do_is_immutable() const | |
2968 | { return true; } | |
2969 | ||
e440a328 | 2970 | Type* |
2971 | do_type() | |
2972 | { return Type::make_nil_type(); } | |
2973 | ||
2974 | void | |
2975 | do_determine_type(const Type_context*) | |
2976 | { } | |
2977 | ||
2978 | Expression* | |
2979 | do_copy() | |
2980 | { return this; } | |
2981 | ||
ea664253 | 2982 | Bexpression* |
2983 | do_get_backend(Translate_context* context) | |
2984 | { return context->backend()->nil_pointer_expression(); } | |
e440a328 | 2985 | |
2986 | void | |
2987 | do_export(Export* exp) const | |
2988 | { exp->write_c_string("nil"); } | |
d751bb78 | 2989 | |
2990 | void | |
2991 | do_dump_expression(Ast_dump_context* ast_dump_context) const | |
2992 | { ast_dump_context->ostream() << "nil"; } | |
e440a328 | 2993 | }; |
2994 | ||
2995 | // Import a nil expression. | |
2996 | ||
2997 | Expression* | |
2998 | Nil_expression::do_import(Import* imp) | |
2999 | { | |
3000 | imp->require_c_string("nil"); | |
3001 | return Expression::make_nil(imp->location()); | |
3002 | } | |
3003 | ||
3004 | // Make a nil expression. | |
3005 | ||
3006 | Expression* | |
b13c66cd | 3007 | Expression::make_nil(Location location) |
e440a328 | 3008 | { |
3009 | return new Nil_expression(location); | |
3010 | } | |
3011 | ||
3012 | // The value of the predeclared constant iota. This is little more | |
3013 | // than a marker. This will be lowered to an integer in | |
3014 | // Const_expression::do_lower, which is where we know the value that | |
3015 | // it should have. | |
3016 | ||
3017 | class Iota_expression : public Parser_expression | |
3018 | { | |
3019 | public: | |
b13c66cd | 3020 | Iota_expression(Location location) |
e440a328 | 3021 | : Parser_expression(EXPRESSION_IOTA, location) |
3022 | { } | |
3023 | ||
3024 | protected: | |
3025 | Expression* | |
ceeb4318 | 3026 | do_lower(Gogo*, Named_object*, Statement_inserter*, int) |
c3e6f413 | 3027 | { go_unreachable(); } |
e440a328 | 3028 | |
3029 | // There should only ever be one of these. | |
3030 | Expression* | |
3031 | do_copy() | |
c3e6f413 | 3032 | { go_unreachable(); } |
d751bb78 | 3033 | |
3034 | void | |
3035 | do_dump_expression(Ast_dump_context* ast_dump_context) const | |
3036 | { ast_dump_context->ostream() << "iota"; } | |
e440a328 | 3037 | }; |
3038 | ||
3039 | // Make an iota expression. This is only called for one case: the | |
3040 | // value of the predeclared constant iota. | |
3041 | ||
3042 | Expression* | |
3043 | Expression::make_iota() | |
3044 | { | |
b13c66cd | 3045 | static Iota_expression iota_expression(Linemap::unknown_location()); |
e440a328 | 3046 | return &iota_expression; |
3047 | } | |
3048 | ||
da244e59 | 3049 | // Class Type_conversion_expression. |
e440a328 | 3050 | |
3051 | // Traversal. | |
3052 | ||
3053 | int | |
3054 | Type_conversion_expression::do_traverse(Traverse* traverse) | |
3055 | { | |
3056 | if (Expression::traverse(&this->expr_, traverse) == TRAVERSE_EXIT | |
3057 | || Type::traverse(this->type_, traverse) == TRAVERSE_EXIT) | |
3058 | return TRAVERSE_EXIT; | |
3059 | return TRAVERSE_CONTINUE; | |
3060 | } | |
3061 | ||
3062 | // Convert to a constant at lowering time. | |
3063 | ||
3064 | Expression* | |
ceeb4318 | 3065 | Type_conversion_expression::do_lower(Gogo*, Named_object*, |
3066 | Statement_inserter*, int) | |
e440a328 | 3067 | { |
3068 | Type* type = this->type_; | |
3069 | Expression* val = this->expr_; | |
b13c66cd | 3070 | Location location = this->location(); |
e440a328 | 3071 | |
0c77715b | 3072 | if (type->is_numeric_type()) |
e440a328 | 3073 | { |
0c77715b | 3074 | Numeric_constant nc; |
3075 | if (val->numeric_constant_value(&nc)) | |
e440a328 | 3076 | { |
0c77715b | 3077 | if (!nc.set_type(type, true, location)) |
3078 | return Expression::make_error(location); | |
3079 | return nc.expression(location); | |
e440a328 | 3080 | } |
e440a328 | 3081 | } |
3082 | ||
d7739c9a | 3083 | // According to the language specification on string conversions |
3084 | // (http://golang.org/ref/spec#Conversions_to_and_from_a_string_type): | |
3085 | // When converting an integer into a string, the string will be a UTF-8 | |
3086 | // representation of the integer and integers "outside the range of valid | |
3087 | // Unicode code points are converted to '\uFFFD'." | |
3088 | if (type->is_string_type()) | |
3089 | { | |
3090 | Numeric_constant nc; | |
3091 | if (val->numeric_constant_value(&nc) && nc.is_int()) | |
3092 | { | |
3093 | // An integer value doesn't fit in the Unicode code point range if it | |
3094 | // overflows the Go "int" type or is negative. | |
3095 | unsigned long ul; | |
3096 | if (!nc.set_type(Type::lookup_integer_type("int"), false, location) | |
3097 | || nc.to_unsigned_long(&ul) == Numeric_constant::NC_UL_NEGATIVE) | |
3098 | return Expression::make_string("\ufffd", location); | |
3099 | } | |
3100 | } | |
3101 | ||
55072f2b | 3102 | if (type->is_slice_type()) |
e440a328 | 3103 | { |
3104 | Type* element_type = type->array_type()->element_type()->forwarded(); | |
60963afd | 3105 | bool is_byte = (element_type->integer_type() != NULL |
3106 | && element_type->integer_type()->is_byte()); | |
3107 | bool is_rune = (element_type->integer_type() != NULL | |
3108 | && element_type->integer_type()->is_rune()); | |
3109 | if (is_byte || is_rune) | |
e440a328 | 3110 | { |
3111 | std::string s; | |
3112 | if (val->string_constant_value(&s)) | |
3113 | { | |
3114 | Expression_list* vals = new Expression_list(); | |
3115 | if (is_byte) | |
3116 | { | |
3117 | for (std::string::const_iterator p = s.begin(); | |
3118 | p != s.end(); | |
3119 | p++) | |
3120 | { | |
e67508fa | 3121 | unsigned char c = static_cast<unsigned char>(*p); |
3122 | vals->push_back(Expression::make_integer_ul(c, | |
3123 | element_type, | |
3124 | location)); | |
e440a328 | 3125 | } |
3126 | } | |
3127 | else | |
3128 | { | |
3129 | const char *p = s.data(); | |
3130 | const char *pend = s.data() + s.length(); | |
3131 | while (p < pend) | |
3132 | { | |
3133 | unsigned int c; | |
3134 | int adv = Lex::fetch_char(p, &c); | |
3135 | if (adv == 0) | |
3136 | { | |
3137 | warning_at(this->location(), 0, | |
3138 | "invalid UTF-8 encoding"); | |
3139 | adv = 1; | |
3140 | } | |
3141 | p += adv; | |
e67508fa | 3142 | vals->push_back(Expression::make_integer_ul(c, |
3143 | element_type, | |
3144 | location)); | |
e440a328 | 3145 | } |
3146 | } | |
3147 | ||
3148 | return Expression::make_slice_composite_literal(type, vals, | |
3149 | location); | |
3150 | } | |
3151 | } | |
3152 | } | |
3153 | ||
3154 | return this; | |
3155 | } | |
3156 | ||
35a54f17 | 3157 | // Flatten a type conversion by using a temporary variable for the slice |
3158 | // in slice to string conversions. | |
3159 | ||
3160 | Expression* | |
3161 | Type_conversion_expression::do_flatten(Gogo*, Named_object*, | |
3162 | Statement_inserter* inserter) | |
3163 | { | |
5bf8be8b | 3164 | if (this->type()->is_error_type() || this->expr_->is_error_expression()) |
3165 | { | |
3166 | go_assert(saw_errors()); | |
3167 | return Expression::make_error(this->location()); | |
3168 | } | |
3169 | ||
2c809f8f | 3170 | if (((this->type()->is_string_type() |
3171 | && this->expr_->type()->is_slice_type()) | |
8ba8cc87 | 3172 | || this->expr_->type()->interface_type() != NULL) |
35a54f17 | 3173 | && !this->expr_->is_variable()) |
3174 | { | |
3175 | Temporary_statement* temp = | |
3176 | Statement::make_temporary(NULL, this->expr_, this->location()); | |
3177 | inserter->insert(temp); | |
3178 | this->expr_ = Expression::make_temporary_reference(temp, this->location()); | |
3179 | } | |
3180 | return this; | |
3181 | } | |
3182 | ||
1ca01a59 | 3183 | // Return whether a type conversion is a constant. |
3184 | ||
3185 | bool | |
3186 | Type_conversion_expression::do_is_constant() const | |
3187 | { | |
3188 | if (!this->expr_->is_constant()) | |
3189 | return false; | |
3190 | ||
3191 | // A conversion to a type that may not be used as a constant is not | |
3192 | // a constant. For example, []byte(nil). | |
3193 | Type* type = this->type_; | |
3194 | if (type->integer_type() == NULL | |
3195 | && type->float_type() == NULL | |
3196 | && type->complex_type() == NULL | |
3197 | && !type->is_boolean_type() | |
3198 | && !type->is_string_type()) | |
3199 | return false; | |
3200 | ||
3201 | return true; | |
3202 | } | |
3203 | ||
0e168074 | 3204 | // Return whether a type conversion is immutable. |
3205 | ||
3206 | bool | |
3207 | Type_conversion_expression::do_is_immutable() const | |
3208 | { | |
3209 | Type* type = this->type_; | |
3210 | Type* expr_type = this->expr_->type(); | |
3211 | ||
3212 | if (type->interface_type() != NULL | |
3213 | || expr_type->interface_type() != NULL) | |
3214 | return false; | |
3215 | ||
3216 | if (!this->expr_->is_immutable()) | |
3217 | return false; | |
3218 | ||
3219 | if (Type::are_identical(type, expr_type, false, NULL)) | |
3220 | return true; | |
3221 | ||
3222 | return type->is_basic_type() && expr_type->is_basic_type(); | |
3223 | } | |
3224 | ||
0c77715b | 3225 | // Return the constant numeric value if there is one. |
e440a328 | 3226 | |
3227 | bool | |
0c77715b | 3228 | Type_conversion_expression::do_numeric_constant_value( |
3229 | Numeric_constant* nc) const | |
e440a328 | 3230 | { |
0c77715b | 3231 | if (!this->type_->is_numeric_type()) |
e440a328 | 3232 | return false; |
0c77715b | 3233 | if (!this->expr_->numeric_constant_value(nc)) |
e440a328 | 3234 | return false; |
0c77715b | 3235 | return nc->set_type(this->type_, false, this->location()); |
e440a328 | 3236 | } |
3237 | ||
3238 | // Return the constant string value if there is one. | |
3239 | ||
3240 | bool | |
3241 | Type_conversion_expression::do_string_constant_value(std::string* val) const | |
3242 | { | |
3243 | if (this->type_->is_string_type() | |
3244 | && this->expr_->type()->integer_type() != NULL) | |
3245 | { | |
0c77715b | 3246 | Numeric_constant nc; |
3247 | if (this->expr_->numeric_constant_value(&nc)) | |
e440a328 | 3248 | { |
0c77715b | 3249 | unsigned long ival; |
3250 | if (nc.to_unsigned_long(&ival) == Numeric_constant::NC_UL_VALID) | |
e440a328 | 3251 | { |
0c77715b | 3252 | val->clear(); |
3253 | Lex::append_char(ival, true, val, this->location()); | |
e440a328 | 3254 | return true; |
3255 | } | |
3256 | } | |
e440a328 | 3257 | } |
3258 | ||
3259 | // FIXME: Could handle conversion from const []int here. | |
3260 | ||
3261 | return false; | |
3262 | } | |
3263 | ||
da244e59 | 3264 | // Determine the resulting type of the conversion. |
3265 | ||
3266 | void | |
3267 | Type_conversion_expression::do_determine_type(const Type_context*) | |
3268 | { | |
3269 | Type_context subcontext(this->type_, false); | |
3270 | this->expr_->determine_type(&subcontext); | |
3271 | } | |
3272 | ||
e440a328 | 3273 | // Check that types are convertible. |
3274 | ||
3275 | void | |
3276 | Type_conversion_expression::do_check_types(Gogo*) | |
3277 | { | |
3278 | Type* type = this->type_; | |
3279 | Type* expr_type = this->expr_->type(); | |
3280 | std::string reason; | |
3281 | ||
5c13bd80 | 3282 | if (type->is_error() || expr_type->is_error()) |
842f6425 | 3283 | { |
842f6425 | 3284 | this->set_is_error(); |
3285 | return; | |
3286 | } | |
3287 | ||
e440a328 | 3288 | if (this->may_convert_function_types_ |
3289 | && type->function_type() != NULL | |
3290 | && expr_type->function_type() != NULL) | |
3291 | return; | |
3292 | ||
3293 | if (Type::are_convertible(type, expr_type, &reason)) | |
3294 | return; | |
3295 | ||
3296 | error_at(this->location(), "%s", reason.c_str()); | |
3297 | this->set_is_error(); | |
3298 | } | |
3299 | ||
ea664253 | 3300 | // Get the backend representation for a type conversion. |
e440a328 | 3301 | |
ea664253 | 3302 | Bexpression* |
3303 | Type_conversion_expression::do_get_backend(Translate_context* context) | |
e440a328 | 3304 | { |
e440a328 | 3305 | Type* type = this->type_; |
3306 | Type* expr_type = this->expr_->type(); | |
2c809f8f | 3307 | |
3308 | Gogo* gogo = context->gogo(); | |
3309 | Btype* btype = type->get_backend(gogo); | |
ea664253 | 3310 | Bexpression* bexpr = this->expr_->get_backend(context); |
2c809f8f | 3311 | Location loc = this->location(); |
3312 | ||
3313 | if (Type::are_identical(type, expr_type, false, NULL)) | |
ea664253 | 3314 | return gogo->backend()->convert_expression(btype, bexpr, loc); |
2c809f8f | 3315 | else if (type->interface_type() != NULL |
3316 | || expr_type->interface_type() != NULL) | |
e440a328 | 3317 | { |
2c809f8f | 3318 | Expression* conversion = |
3319 | Expression::convert_for_assignment(gogo, type, this->expr_, | |
3320 | this->location()); | |
ea664253 | 3321 | return conversion->get_backend(context); |
e440a328 | 3322 | } |
3323 | else if (type->is_string_type() | |
3324 | && expr_type->integer_type() != NULL) | |
3325 | { | |
2c809f8f | 3326 | mpz_t intval; |
3327 | Numeric_constant nc; | |
3328 | if (this->expr_->numeric_constant_value(&nc) | |
3329 | && nc.to_int(&intval) | |
3330 | && mpz_fits_ushort_p(intval)) | |
e440a328 | 3331 | { |
e440a328 | 3332 | std::string s; |
2c809f8f | 3333 | Lex::append_char(mpz_get_ui(intval), true, &s, loc); |
3334 | mpz_clear(intval); | |
3335 | Expression* se = Expression::make_string(s, loc); | |
ea664253 | 3336 | return se->get_backend(context); |
e440a328 | 3337 | } |
3338 | ||
f16ab008 | 3339 | Expression* i2s_expr = |
2c809f8f | 3340 | Runtime::make_call(Runtime::INT_TO_STRING, loc, 1, this->expr_); |
ea664253 | 3341 | return Expression::make_cast(type, i2s_expr, loc)->get_backend(context); |
e440a328 | 3342 | } |
55072f2b | 3343 | else if (type->is_string_type() && expr_type->is_slice_type()) |
e440a328 | 3344 | { |
55072f2b | 3345 | Array_type* a = expr_type->array_type(); |
e440a328 | 3346 | Type* e = a->element_type()->forwarded(); |
c484d925 | 3347 | go_assert(e->integer_type() != NULL); |
35a54f17 | 3348 | go_assert(this->expr_->is_variable()); |
3349 | ||
3350 | Runtime::Function code; | |
60963afd | 3351 | if (e->integer_type()->is_byte()) |
35a54f17 | 3352 | code = Runtime::BYTE_ARRAY_TO_STRING; |
e440a328 | 3353 | else |
35a54f17 | 3354 | { |
3355 | go_assert(e->integer_type()->is_rune()); | |
3356 | code = Runtime::INT_ARRAY_TO_STRING; | |
3357 | } | |
3358 | Expression* valptr = a->get_value_pointer(gogo, this->expr_); | |
3359 | Expression* len = a->get_length(gogo, this->expr_); | |
ea664253 | 3360 | return Runtime::make_call(code, loc, 2, valptr, |
3361 | len)->get_backend(context); | |
e440a328 | 3362 | } |
411eb89e | 3363 | else if (type->is_slice_type() && expr_type->is_string_type()) |
e440a328 | 3364 | { |
3365 | Type* e = type->array_type()->element_type()->forwarded(); | |
c484d925 | 3366 | go_assert(e->integer_type() != NULL); |
6c252e42 | 3367 | |
2c809f8f | 3368 | Runtime::Function code; |
60963afd | 3369 | if (e->integer_type()->is_byte()) |
2c809f8f | 3370 | code = Runtime::STRING_TO_BYTE_ARRAY; |
e440a328 | 3371 | else |
3372 | { | |
60963afd | 3373 | go_assert(e->integer_type()->is_rune()); |
2c809f8f | 3374 | code = Runtime::STRING_TO_INT_ARRAY; |
e440a328 | 3375 | } |
2c809f8f | 3376 | Expression* s2a = Runtime::make_call(code, loc, 1, this->expr_); |
ea664253 | 3377 | return Expression::make_unsafe_cast(type, s2a, loc)->get_backend(context); |
2c809f8f | 3378 | } |
3379 | else if (type->is_numeric_type()) | |
3380 | { | |
3381 | go_assert(Type::are_convertible(type, expr_type, NULL)); | |
ea664253 | 3382 | return gogo->backend()->convert_expression(btype, bexpr, loc); |
e440a328 | 3383 | } |
3384 | else if ((type->is_unsafe_pointer_type() | |
2c809f8f | 3385 | && (expr_type->points_to() != NULL |
3386 | || expr_type->integer_type())) | |
3387 | || (expr_type->is_unsafe_pointer_type() | |
3388 | && type->points_to() != NULL) | |
3389 | || (this->may_convert_function_types_ | |
3390 | && type->function_type() != NULL | |
3391 | && expr_type->function_type() != NULL)) | |
ea664253 | 3392 | return gogo->backend()->convert_expression(btype, bexpr, loc); |
e440a328 | 3393 | else |
2c809f8f | 3394 | { |
3395 | Expression* conversion = | |
3396 | Expression::convert_for_assignment(gogo, type, this->expr_, loc); | |
ea664253 | 3397 | return conversion->get_backend(context); |
2c809f8f | 3398 | } |
e440a328 | 3399 | } |
3400 | ||
3401 | // Output a type conversion in a constant expression. | |
3402 | ||
3403 | void | |
3404 | Type_conversion_expression::do_export(Export* exp) const | |
3405 | { | |
3406 | exp->write_c_string("convert("); | |
3407 | exp->write_type(this->type_); | |
3408 | exp->write_c_string(", "); | |
3409 | this->expr_->export_expression(exp); | |
3410 | exp->write_c_string(")"); | |
3411 | } | |
3412 | ||
3413 | // Import a type conversion or a struct construction. | |
3414 | ||
3415 | Expression* | |
3416 | Type_conversion_expression::do_import(Import* imp) | |
3417 | { | |
3418 | imp->require_c_string("convert("); | |
3419 | Type* type = imp->read_type(); | |
3420 | imp->require_c_string(", "); | |
3421 | Expression* val = Expression::import_expression(imp); | |
3422 | imp->require_c_string(")"); | |
3423 | return Expression::make_cast(type, val, imp->location()); | |
3424 | } | |
3425 | ||
d751bb78 | 3426 | // Dump ast representation for a type conversion expression. |
3427 | ||
3428 | void | |
3429 | Type_conversion_expression::do_dump_expression( | |
3430 | Ast_dump_context* ast_dump_context) const | |
3431 | { | |
3432 | ast_dump_context->dump_type(this->type_); | |
3433 | ast_dump_context->ostream() << "("; | |
3434 | ast_dump_context->dump_expression(this->expr_); | |
3435 | ast_dump_context->ostream() << ") "; | |
3436 | } | |
3437 | ||
e440a328 | 3438 | // Make a type cast expression. |
3439 | ||
3440 | Expression* | |
b13c66cd | 3441 | Expression::make_cast(Type* type, Expression* val, Location location) |
e440a328 | 3442 | { |
3443 | if (type->is_error_type() || val->is_error_expression()) | |
3444 | return Expression::make_error(location); | |
3445 | return new Type_conversion_expression(type, val, location); | |
3446 | } | |
3447 | ||
98f62f7a | 3448 | // Class Unsafe_type_conversion_expression. |
9581e91d | 3449 | |
3450 | // Traversal. | |
3451 | ||
3452 | int | |
3453 | Unsafe_type_conversion_expression::do_traverse(Traverse* traverse) | |
3454 | { | |
3455 | if (Expression::traverse(&this->expr_, traverse) == TRAVERSE_EXIT | |
3456 | || Type::traverse(this->type_, traverse) == TRAVERSE_EXIT) | |
3457 | return TRAVERSE_EXIT; | |
3458 | return TRAVERSE_CONTINUE; | |
3459 | } | |
3460 | ||
aa5ae575 | 3461 | // Return whether an unsafe type conversion is immutable. |
3462 | ||
3463 | bool | |
3464 | Unsafe_type_conversion_expression::do_is_immutable() const | |
3465 | { | |
3466 | Type* type = this->type_; | |
3467 | Type* expr_type = this->expr_->type(); | |
3468 | ||
3469 | if (type->interface_type() != NULL | |
3470 | || expr_type->interface_type() != NULL) | |
3471 | return false; | |
3472 | ||
3473 | if (!this->expr_->is_immutable()) | |
3474 | return false; | |
3475 | ||
3476 | if (Type::are_convertible(type, expr_type, NULL)) | |
3477 | return true; | |
3478 | ||
3479 | return type->is_basic_type() && expr_type->is_basic_type(); | |
3480 | } | |
3481 | ||
9581e91d | 3482 | // Convert to backend representation. |
3483 | ||
ea664253 | 3484 | Bexpression* |
3485 | Unsafe_type_conversion_expression::do_get_backend(Translate_context* context) | |
9581e91d | 3486 | { |
3487 | // We are only called for a limited number of cases. | |
3488 | ||
3489 | Type* t = this->type_; | |
3490 | Type* et = this->expr_->type(); | |
5c4802f1 | 3491 | |
3492 | if (t->is_error_type() | |
3493 | || this->expr_->is_error_expression() | |
3494 | || et->is_error_type()) | |
3495 | { | |
3496 | go_assert(saw_errors()); | |
3497 | return context->backend()->error_expression(); | |
3498 | } | |
3499 | ||
2c809f8f | 3500 | if (t->array_type() != NULL) |
3501 | go_assert(et->array_type() != NULL | |
3502 | && t->is_slice_type() == et->is_slice_type()); | |
3503 | else if (t->struct_type() != NULL) | |
9581e91d | 3504 | { |
2c809f8f | 3505 | if (t->named_type() != NULL |
3506 | && et->named_type() != NULL | |
3507 | && !Type::are_convertible(t, et, NULL)) | |
3508 | { | |
3509 | go_assert(saw_errors()); | |
ea664253 | 3510 | return context->backend()->error_expression(); |
2c809f8f | 3511 | } |
3512 | ||
3513 | go_assert(et->struct_type() != NULL | |
3514 | && Type::are_convertible(t, et, NULL)); | |
3515 | } | |
3516 | else if (t->map_type() != NULL) | |
c484d925 | 3517 | go_assert(et->map_type() != NULL); |
9581e91d | 3518 | else if (t->channel_type() != NULL) |
c484d925 | 3519 | go_assert(et->channel_type() != NULL); |
09ea332d | 3520 | else if (t->points_to() != NULL) |
2c809f8f | 3521 | go_assert(et->points_to() != NULL |
3522 | || et->channel_type() != NULL | |
3523 | || et->map_type() != NULL | |
3524 | || et->function_type() != NULL | |
3525 | || et->is_nil_type()); | |
9581e91d | 3526 | else if (et->is_unsafe_pointer_type()) |
c484d925 | 3527 | go_assert(t->points_to() != NULL); |
2c809f8f | 3528 | else if (t->interface_type() != NULL) |
9581e91d | 3529 | { |
2c809f8f | 3530 | bool empty_iface = t->interface_type()->is_empty(); |
c484d925 | 3531 | go_assert(et->interface_type() != NULL |
2c809f8f | 3532 | && et->interface_type()->is_empty() == empty_iface); |
9581e91d | 3533 | } |
588e3cf9 | 3534 | else if (t->integer_type() != NULL) |
2c809f8f | 3535 | go_assert(et->is_boolean_type() |
3536 | || et->integer_type() != NULL | |
3537 | || et->function_type() != NULL | |
3538 | || et->points_to() != NULL | |
3539 | || et->map_type() != NULL | |
8ba8cc87 | 3540 | || et->channel_type() != NULL |
3541 | || et->is_nil_type()); | |
9581e91d | 3542 | else |
c3e6f413 | 3543 | go_unreachable(); |
9581e91d | 3544 | |
2c809f8f | 3545 | Gogo* gogo = context->gogo(); |
3546 | Btype* btype = t->get_backend(gogo); | |
ea664253 | 3547 | Bexpression* bexpr = this->expr_->get_backend(context); |
2c809f8f | 3548 | Location loc = this->location(); |
ea664253 | 3549 | return gogo->backend()->convert_expression(btype, bexpr, loc); |
9581e91d | 3550 | } |
3551 | ||
d751bb78 | 3552 | // Dump ast representation for an unsafe type conversion expression. |
3553 | ||
3554 | void | |
3555 | Unsafe_type_conversion_expression::do_dump_expression( | |
3556 | Ast_dump_context* ast_dump_context) const | |
3557 | { | |
3558 | ast_dump_context->dump_type(this->type_); | |
3559 | ast_dump_context->ostream() << "("; | |
3560 | ast_dump_context->dump_expression(this->expr_); | |
3561 | ast_dump_context->ostream() << ") "; | |
3562 | } | |
3563 | ||
9581e91d | 3564 | // Make an unsafe type conversion expression. |
3565 | ||
3566 | Expression* | |
3567 | Expression::make_unsafe_cast(Type* type, Expression* expr, | |
b13c66cd | 3568 | Location location) |
9581e91d | 3569 | { |
3570 | return new Unsafe_type_conversion_expression(type, expr, location); | |
3571 | } | |
3572 | ||
76f85fd6 | 3573 | // Class Unary_expression. |
e440a328 | 3574 | |
3575 | // If we are taking the address of a composite literal, and the | |
2c809f8f | 3576 | // contents are not constant, then we want to make a heap expression |
e440a328 | 3577 | // instead. |
3578 | ||
3579 | Expression* | |
ceeb4318 | 3580 | Unary_expression::do_lower(Gogo*, Named_object*, Statement_inserter*, int) |
e440a328 | 3581 | { |
b13c66cd | 3582 | Location loc = this->location(); |
e440a328 | 3583 | Operator op = this->op_; |
3584 | Expression* expr = this->expr_; | |
3585 | ||
3586 | if (op == OPERATOR_MULT && expr->is_type_expression()) | |
3587 | return Expression::make_type(Type::make_pointer_type(expr->type()), loc); | |
3588 | ||
3589 | // *&x simplifies to x. *(*T)(unsafe.Pointer)(&x) does not require | |
3590 | // moving x to the heap. FIXME: Is it worth doing a real escape | |
3591 | // analysis here? This case is found in math/unsafe.go and is | |
3592 | // therefore worth special casing. | |
3593 | if (op == OPERATOR_MULT) | |
3594 | { | |
3595 | Expression* e = expr; | |
3596 | while (e->classification() == EXPRESSION_CONVERSION) | |
3597 | { | |
3598 | Type_conversion_expression* te | |
3599 | = static_cast<Type_conversion_expression*>(e); | |
3600 | e = te->expr(); | |
3601 | } | |
3602 | ||
3603 | if (e->classification() == EXPRESSION_UNARY) | |
3604 | { | |
3605 | Unary_expression* ue = static_cast<Unary_expression*>(e); | |
3606 | if (ue->op_ == OPERATOR_AND) | |
3607 | { | |
3608 | if (e == expr) | |
3609 | { | |
3610 | // *&x == x. | |
f4dea966 | 3611 | if (!ue->expr_->is_addressable() && !ue->create_temp_) |
3612 | { | |
3613 | error_at(ue->location(), | |
3614 | "invalid operand for unary %<&%>"); | |
3615 | this->set_is_error(); | |
3616 | } | |
e440a328 | 3617 | return ue->expr_; |
3618 | } | |
3619 | ue->set_does_not_escape(); | |
3620 | } | |
3621 | } | |
3622 | } | |
3623 | ||
55661ce9 | 3624 | // Catching an invalid indirection of unsafe.Pointer here avoid |
3625 | // having to deal with TYPE_VOID in other places. | |
3626 | if (op == OPERATOR_MULT && expr->type()->is_unsafe_pointer_type()) | |
3627 | { | |
3628 | error_at(this->location(), "invalid indirect of %<unsafe.Pointer%>"); | |
3629 | return Expression::make_error(this->location()); | |
3630 | } | |
3631 | ||
d9f3743a | 3632 | // Check for an invalid pointer dereference. We need to do this |
3633 | // here because Unary_expression::do_type will return an error type | |
3634 | // in this case. That can cause code to appear erroneous, and | |
3635 | // therefore disappear at lowering time, without any error message. | |
3636 | if (op == OPERATOR_MULT && expr->type()->points_to() == NULL) | |
3637 | { | |
3638 | this->report_error(_("expected pointer")); | |
3639 | return Expression::make_error(this->location()); | |
3640 | } | |
3641 | ||
59a401fe | 3642 | if (op == OPERATOR_PLUS || op == OPERATOR_MINUS || op == OPERATOR_XOR) |
e440a328 | 3643 | { |
0c77715b | 3644 | Numeric_constant nc; |
3645 | if (expr->numeric_constant_value(&nc)) | |
e440a328 | 3646 | { |
0c77715b | 3647 | Numeric_constant result; |
3648 | if (Unary_expression::eval_constant(op, &nc, loc, &result)) | |
3649 | return result.expression(loc); | |
e440a328 | 3650 | } |
3651 | } | |
3652 | ||
3653 | return this; | |
3654 | } | |
3655 | ||
f9ca30f9 | 3656 | // Flatten expression if a nil check must be performed and create temporary |
3657 | // variables if necessary. | |
3658 | ||
3659 | Expression* | |
3660 | Unary_expression::do_flatten(Gogo* gogo, Named_object*, | |
3661 | Statement_inserter* inserter) | |
3662 | { | |
5bf8be8b | 3663 | if (this->is_error_expression() |
3664 | || this->expr_->is_error_expression() | |
3665 | || this->expr_->type()->is_error_type()) | |
3666 | { | |
3667 | go_assert(saw_errors()); | |
3668 | return Expression::make_error(this->location()); | |
3669 | } | |
f4dea966 | 3670 | |
f9ca30f9 | 3671 | Location location = this->location(); |
3672 | if (this->op_ == OPERATOR_MULT | |
3673 | && !this->expr_->is_variable()) | |
3674 | { | |
3675 | go_assert(this->expr_->type()->points_to() != NULL); | |
3676 | Type* ptype = this->expr_->type()->points_to(); | |
3677 | if (!ptype->is_void_type()) | |
3678 | { | |
2a305b85 | 3679 | int64_t s; |
3680 | bool ok = ptype->backend_type_size(gogo, &s); | |
3681 | if (!ok) | |
3682 | { | |
3683 | go_assert(saw_errors()); | |
3684 | return Expression::make_error(this->location()); | |
3685 | } | |
f9ca30f9 | 3686 | if (s >= 4096 || this->issue_nil_check_) |
3687 | { | |
3688 | Temporary_statement* temp = | |
3689 | Statement::make_temporary(NULL, this->expr_, location); | |
3690 | inserter->insert(temp); | |
3691 | this->expr_ = | |
3692 | Expression::make_temporary_reference(temp, location); | |
3693 | } | |
3694 | } | |
3695 | } | |
3696 | ||
da244e59 | 3697 | if (this->op_ == OPERATOR_AND) |
3698 | { | |
8ff995b5 | 3699 | // If this->escapes_ is false at this point, then it was set to |
3700 | // false by an explicit call to set_does_not_escape, and the | |
3701 | // value does not escape. If this->escapes_ is true, we may be | |
3702 | // able to set it to false if taking the address of a variable | |
3703 | // that does not escape. | |
3704 | if (this->escapes_ && this->expr_->var_expression() != NULL) | |
da244e59 | 3705 | { |
3706 | Named_object* var = this->expr_->var_expression()->named_object(); | |
3707 | if (var->is_variable()) | |
3708 | this->escapes_ = var->var_value()->escapes(); | |
3709 | if (var->is_result_variable()) | |
3710 | this->escapes_ = var->result_var_value()->escapes(); | |
3711 | } | |
3712 | this->expr_->address_taken(this->escapes_); | |
3713 | } | |
3714 | ||
f9ca30f9 | 3715 | if (this->create_temp_ && !this->expr_->is_variable()) |
3716 | { | |
3717 | Temporary_statement* temp = | |
3718 | Statement::make_temporary(NULL, this->expr_, location); | |
3719 | inserter->insert(temp); | |
3720 | this->expr_ = Expression::make_temporary_reference(temp, location); | |
3721 | } | |
3722 | ||
3723 | return this; | |
3724 | } | |
3725 | ||
e440a328 | 3726 | // Return whether a unary expression is a constant. |
3727 | ||
3728 | bool | |
3729 | Unary_expression::do_is_constant() const | |
3730 | { | |
3731 | if (this->op_ == OPERATOR_MULT) | |
3732 | { | |
3733 | // Indirecting through a pointer is only constant if the object | |
3734 | // to which the expression points is constant, but we currently | |
3735 | // have no way to determine that. | |
3736 | return false; | |
3737 | } | |
3738 | else if (this->op_ == OPERATOR_AND) | |
3739 | { | |
3740 | // Taking the address of a variable is constant if it is a | |
f9ca30f9 | 3741 | // global variable, not constant otherwise. In other cases taking the |
3742 | // address is probably not a constant. | |
e440a328 | 3743 | Var_expression* ve = this->expr_->var_expression(); |
3744 | if (ve != NULL) | |
3745 | { | |
3746 | Named_object* no = ve->named_object(); | |
3747 | return no->is_variable() && no->var_value()->is_global(); | |
3748 | } | |
3749 | return false; | |
3750 | } | |
3751 | else | |
3752 | return this->expr_->is_constant(); | |
3753 | } | |
3754 | ||
0c77715b | 3755 | // Apply unary opcode OP to UNC, setting NC. Return true if this |
3756 | // could be done, false if not. Issue errors for overflow. | |
e440a328 | 3757 | |
3758 | bool | |
0c77715b | 3759 | Unary_expression::eval_constant(Operator op, const Numeric_constant* unc, |
3760 | Location location, Numeric_constant* nc) | |
e440a328 | 3761 | { |
3762 | switch (op) | |
3763 | { | |
3764 | case OPERATOR_PLUS: | |
0c77715b | 3765 | *nc = *unc; |
e440a328 | 3766 | return true; |
0c77715b | 3767 | |
e440a328 | 3768 | case OPERATOR_MINUS: |
0c77715b | 3769 | if (unc->is_int() || unc->is_rune()) |
3770 | break; | |
3771 | else if (unc->is_float()) | |
3772 | { | |
3773 | mpfr_t uval; | |
3774 | unc->get_float(&uval); | |
3775 | mpfr_t val; | |
3776 | mpfr_init(val); | |
3777 | mpfr_neg(val, uval, GMP_RNDN); | |
3778 | nc->set_float(unc->type(), val); | |
3779 | mpfr_clear(uval); | |
3780 | mpfr_clear(val); | |
3781 | return true; | |
3782 | } | |
3783 | else if (unc->is_complex()) | |
3784 | { | |
fcbea5e4 | 3785 | mpc_t uval; |
3786 | unc->get_complex(&uval); | |
3787 | mpc_t val; | |
3788 | mpc_init2(val, mpc_precision); | |
3789 | mpc_neg(val, uval, MPC_RNDNN); | |
3790 | nc->set_complex(unc->type(), val); | |
3791 | mpc_clear(uval); | |
3792 | mpc_clear(val); | |
0c77715b | 3793 | return true; |
3794 | } | |
e440a328 | 3795 | else |
0c77715b | 3796 | go_unreachable(); |
e440a328 | 3797 | |
0c77715b | 3798 | case OPERATOR_XOR: |
3799 | break; | |
68448d53 | 3800 | |
59a401fe | 3801 | case OPERATOR_NOT: |
e440a328 | 3802 | case OPERATOR_AND: |
3803 | case OPERATOR_MULT: | |
3804 | return false; | |
0c77715b | 3805 | |
e440a328 | 3806 | default: |
c3e6f413 | 3807 | go_unreachable(); |
e440a328 | 3808 | } |
e440a328 | 3809 | |
0c77715b | 3810 | if (!unc->is_int() && !unc->is_rune()) |
3811 | return false; | |
3812 | ||
3813 | mpz_t uval; | |
8387e1df | 3814 | if (unc->is_rune()) |
3815 | unc->get_rune(&uval); | |
3816 | else | |
3817 | unc->get_int(&uval); | |
0c77715b | 3818 | mpz_t val; |
3819 | mpz_init(val); | |
e440a328 | 3820 | |
e440a328 | 3821 | switch (op) |
3822 | { | |
e440a328 | 3823 | case OPERATOR_MINUS: |
0c77715b | 3824 | mpz_neg(val, uval); |
3825 | break; | |
3826 | ||
e440a328 | 3827 | case OPERATOR_NOT: |
0c77715b | 3828 | mpz_set_ui(val, mpz_cmp_si(uval, 0) == 0 ? 1 : 0); |
3829 | break; | |
3830 | ||
e440a328 | 3831 | case OPERATOR_XOR: |
0c77715b | 3832 | { |
3833 | Type* utype = unc->type(); | |
3834 | if (utype->integer_type() == NULL | |
3835 | || utype->integer_type()->is_abstract()) | |
3836 | mpz_com(val, uval); | |
3837 | else | |
3838 | { | |
3839 | // The number of HOST_WIDE_INTs that it takes to represent | |
3840 | // UVAL. | |
3841 | size_t count = ((mpz_sizeinbase(uval, 2) | |
3842 | + HOST_BITS_PER_WIDE_INT | |
3843 | - 1) | |
3844 | / HOST_BITS_PER_WIDE_INT); | |
e440a328 | 3845 | |
0c77715b | 3846 | unsigned HOST_WIDE_INT* phwi = new unsigned HOST_WIDE_INT[count]; |
3847 | memset(phwi, 0, count * sizeof(HOST_WIDE_INT)); | |
3848 | ||
3849 | size_t obits = utype->integer_type()->bits(); | |
3850 | ||
3851 | if (!utype->integer_type()->is_unsigned() && mpz_sgn(uval) < 0) | |
3852 | { | |
3853 | mpz_t adj; | |
3854 | mpz_init_set_ui(adj, 1); | |
3855 | mpz_mul_2exp(adj, adj, obits); | |
3856 | mpz_add(uval, uval, adj); | |
3857 | mpz_clear(adj); | |
3858 | } | |
3859 | ||
3860 | size_t ecount; | |
3861 | mpz_export(phwi, &ecount, -1, sizeof(HOST_WIDE_INT), 0, 0, uval); | |
3862 | go_assert(ecount <= count); | |
3863 | ||
3864 | // Trim down to the number of words required by the type. | |
3865 | size_t ocount = ((obits + HOST_BITS_PER_WIDE_INT - 1) | |
3866 | / HOST_BITS_PER_WIDE_INT); | |
3867 | go_assert(ocount <= count); | |
3868 | ||
3869 | for (size_t i = 0; i < ocount; ++i) | |
3870 | phwi[i] = ~phwi[i]; | |
3871 | ||
3872 | size_t clearbits = ocount * HOST_BITS_PER_WIDE_INT - obits; | |
3873 | if (clearbits != 0) | |
3874 | phwi[ocount - 1] &= (((unsigned HOST_WIDE_INT) (HOST_WIDE_INT) -1) | |
3875 | >> clearbits); | |
3876 | ||
3877 | mpz_import(val, ocount, -1, sizeof(HOST_WIDE_INT), 0, 0, phwi); | |
3878 | ||
3879 | if (!utype->integer_type()->is_unsigned() | |
3880 | && mpz_tstbit(val, obits - 1)) | |
3881 | { | |
3882 | mpz_t adj; | |
3883 | mpz_init_set_ui(adj, 1); | |
3884 | mpz_mul_2exp(adj, adj, obits); | |
3885 | mpz_sub(val, val, adj); | |
3886 | mpz_clear(adj); | |
3887 | } | |
3888 | ||
3889 | delete[] phwi; | |
3890 | } | |
3891 | } | |
3892 | break; | |
e440a328 | 3893 | |
e440a328 | 3894 | default: |
c3e6f413 | 3895 | go_unreachable(); |
e440a328 | 3896 | } |
e440a328 | 3897 | |
0c77715b | 3898 | if (unc->is_rune()) |
3899 | nc->set_rune(NULL, val); | |
e440a328 | 3900 | else |
0c77715b | 3901 | nc->set_int(NULL, val); |
e440a328 | 3902 | |
0c77715b | 3903 | mpz_clear(uval); |
3904 | mpz_clear(val); | |
e440a328 | 3905 | |
0c77715b | 3906 | return nc->set_type(unc->type(), true, location); |
e440a328 | 3907 | } |
3908 | ||
0c77715b | 3909 | // Return the integral constant value of a unary expression, if it has one. |
e440a328 | 3910 | |
3911 | bool | |
0c77715b | 3912 | Unary_expression::do_numeric_constant_value(Numeric_constant* nc) const |
e440a328 | 3913 | { |
0c77715b | 3914 | Numeric_constant unc; |
3915 | if (!this->expr_->numeric_constant_value(&unc)) | |
3916 | return false; | |
3917 | return Unary_expression::eval_constant(this->op_, &unc, this->location(), | |
3918 | nc); | |
e440a328 | 3919 | } |
3920 | ||
3921 | // Return the type of a unary expression. | |
3922 | ||
3923 | Type* | |
3924 | Unary_expression::do_type() | |
3925 | { | |
3926 | switch (this->op_) | |
3927 | { | |
3928 | case OPERATOR_PLUS: | |
3929 | case OPERATOR_MINUS: | |
3930 | case OPERATOR_NOT: | |
3931 | case OPERATOR_XOR: | |
3932 | return this->expr_->type(); | |
3933 | ||
3934 | case OPERATOR_AND: | |
3935 | return Type::make_pointer_type(this->expr_->type()); | |
3936 | ||
3937 | case OPERATOR_MULT: | |
3938 | { | |
3939 | Type* subtype = this->expr_->type(); | |
3940 | Type* points_to = subtype->points_to(); | |
3941 | if (points_to == NULL) | |
3942 | return Type::make_error_type(); | |
3943 | return points_to; | |
3944 | } | |
3945 | ||
3946 | default: | |
c3e6f413 | 3947 | go_unreachable(); |
e440a328 | 3948 | } |
3949 | } | |
3950 | ||
3951 | // Determine abstract types for a unary expression. | |
3952 | ||
3953 | void | |
3954 | Unary_expression::do_determine_type(const Type_context* context) | |
3955 | { | |
3956 | switch (this->op_) | |
3957 | { | |
3958 | case OPERATOR_PLUS: | |
3959 | case OPERATOR_MINUS: | |
3960 | case OPERATOR_NOT: | |
3961 | case OPERATOR_XOR: | |
3962 | this->expr_->determine_type(context); | |
3963 | break; | |
3964 | ||
3965 | case OPERATOR_AND: | |
3966 | // Taking the address of something. | |
3967 | { | |
3968 | Type* subtype = (context->type == NULL | |
3969 | ? NULL | |
3970 | : context->type->points_to()); | |
3971 | Type_context subcontext(subtype, false); | |
3972 | this->expr_->determine_type(&subcontext); | |
3973 | } | |
3974 | break; | |
3975 | ||
3976 | case OPERATOR_MULT: | |
3977 | // Indirecting through a pointer. | |
3978 | { | |
3979 | Type* subtype = (context->type == NULL | |
3980 | ? NULL | |
3981 | : Type::make_pointer_type(context->type)); | |
3982 | Type_context subcontext(subtype, false); | |
3983 | this->expr_->determine_type(&subcontext); | |
3984 | } | |
3985 | break; | |
3986 | ||
3987 | default: | |
c3e6f413 | 3988 | go_unreachable(); |
e440a328 | 3989 | } |
3990 | } | |
3991 | ||
3992 | // Check types for a unary expression. | |
3993 | ||
3994 | void | |
3995 | Unary_expression::do_check_types(Gogo*) | |
3996 | { | |
9fe897ef | 3997 | Type* type = this->expr_->type(); |
5c13bd80 | 3998 | if (type->is_error()) |
9fe897ef | 3999 | { |
4000 | this->set_is_error(); | |
4001 | return; | |
4002 | } | |
4003 | ||
e440a328 | 4004 | switch (this->op_) |
4005 | { | |
4006 | case OPERATOR_PLUS: | |
4007 | case OPERATOR_MINUS: | |
9fe897ef | 4008 | if (type->integer_type() == NULL |
4009 | && type->float_type() == NULL | |
4010 | && type->complex_type() == NULL) | |
4011 | this->report_error(_("expected numeric type")); | |
e440a328 | 4012 | break; |
4013 | ||
4014 | case OPERATOR_NOT: | |
59a401fe | 4015 | if (!type->is_boolean_type()) |
4016 | this->report_error(_("expected boolean type")); | |
4017 | break; | |
4018 | ||
e440a328 | 4019 | case OPERATOR_XOR: |
b3b1474e | 4020 | if (type->integer_type() == NULL) |
4021 | this->report_error(_("expected integer")); | |
e440a328 | 4022 | break; |
4023 | ||
4024 | case OPERATOR_AND: | |
4025 | if (!this->expr_->is_addressable()) | |
09ea332d | 4026 | { |
4027 | if (!this->create_temp_) | |
f4dea966 | 4028 | { |
4029 | error_at(this->location(), "invalid operand for unary %<&%>"); | |
4030 | this->set_is_error(); | |
4031 | } | |
09ea332d | 4032 | } |
e440a328 | 4033 | else |
da244e59 | 4034 | this->expr_->issue_nil_check(); |
e440a328 | 4035 | break; |
4036 | ||
4037 | case OPERATOR_MULT: | |
4038 | // Indirecting through a pointer. | |
9fe897ef | 4039 | if (type->points_to() == NULL) |
4040 | this->report_error(_("expected pointer")); | |
7661d702 | 4041 | if (type->points_to()->is_error()) |
4042 | this->set_is_error(); | |
e440a328 | 4043 | break; |
4044 | ||
4045 | default: | |
c3e6f413 | 4046 | go_unreachable(); |
e440a328 | 4047 | } |
4048 | } | |
4049 | ||
ea664253 | 4050 | // Get the backend representation for a unary expression. |
e440a328 | 4051 | |
ea664253 | 4052 | Bexpression* |
4053 | Unary_expression::do_get_backend(Translate_context* context) | |
e440a328 | 4054 | { |
1b1f2abf | 4055 | Gogo* gogo = context->gogo(); |
e9d3367e | 4056 | Location loc = this->location(); |
4057 | ||
4058 | // Taking the address of a set-and-use-temporary expression requires | |
4059 | // setting the temporary and then taking the address. | |
4060 | if (this->op_ == OPERATOR_AND) | |
4061 | { | |
4062 | Set_and_use_temporary_expression* sut = | |
4063 | this->expr_->set_and_use_temporary_expression(); | |
4064 | if (sut != NULL) | |
4065 | { | |
4066 | Temporary_statement* temp = sut->temporary(); | |
4067 | Bvariable* bvar = temp->get_backend_variable(context); | |
f9ca30f9 | 4068 | Bexpression* bvar_expr = gogo->backend()->var_expression(bvar, loc); |
ea664253 | 4069 | Bexpression* bval = sut->expression()->get_backend(context); |
f9ca30f9 | 4070 | |
4071 | Bstatement* bassign = | |
4072 | gogo->backend()->assignment_statement(bvar_expr, bval, loc); | |
4073 | Bexpression* bvar_addr = | |
4074 | gogo->backend()->address_expression(bvar_expr, loc); | |
ea664253 | 4075 | return gogo->backend()->compound_expression(bassign, bvar_addr, loc); |
e9d3367e | 4076 | } |
4077 | } | |
4078 | ||
f9ca30f9 | 4079 | Bexpression* ret; |
ea664253 | 4080 | Bexpression* bexpr = this->expr_->get_backend(context); |
f9ca30f9 | 4081 | Btype* btype = this->expr_->type()->get_backend(gogo); |
e440a328 | 4082 | switch (this->op_) |
4083 | { | |
4084 | case OPERATOR_PLUS: | |
f9ca30f9 | 4085 | ret = bexpr; |
4086 | break; | |
e440a328 | 4087 | |
4088 | case OPERATOR_MINUS: | |
f9ca30f9 | 4089 | ret = gogo->backend()->unary_expression(this->op_, bexpr, loc); |
4090 | ret = gogo->backend()->convert_expression(btype, ret, loc); | |
4091 | break; | |
e440a328 | 4092 | |
4093 | case OPERATOR_NOT: | |
e440a328 | 4094 | case OPERATOR_XOR: |
f9ca30f9 | 4095 | ret = gogo->backend()->unary_expression(this->op_, bexpr, loc); |
4096 | break; | |
e440a328 | 4097 | |
4098 | case OPERATOR_AND: | |
09ea332d | 4099 | if (!this->create_temp_) |
4100 | { | |
4101 | // We should not see a non-constant constructor here; cases | |
4102 | // where we would see one should have been moved onto the | |
4103 | // heap at parse time. Taking the address of a nonconstant | |
4104 | // constructor will not do what the programmer expects. | |
f9ca30f9 | 4105 | |
4106 | go_assert(!this->expr_->is_composite_literal() | |
4107 | || this->expr_->is_immutable()); | |
24060bf9 | 4108 | if (this->expr_->classification() == EXPRESSION_UNARY) |
4109 | { | |
4110 | Unary_expression* ue = | |
4111 | static_cast<Unary_expression*>(this->expr_); | |
4112 | go_assert(ue->op() != OPERATOR_AND); | |
4113 | } | |
09ea332d | 4114 | } |
e440a328 | 4115 | |
f23d7786 | 4116 | static unsigned int counter; |
4117 | char buf[100]; | |
4118 | if (this->is_gc_root_ || this->is_slice_init_) | |
76f85fd6 | 4119 | { |
f23d7786 | 4120 | bool copy_to_heap = false; |
4121 | if (this->is_gc_root_) | |
4122 | { | |
4123 | // Build a decl for a GC root variable. GC roots are mutable, so | |
4124 | // they cannot be represented as an immutable_struct in the | |
4125 | // backend. | |
4126 | static unsigned int root_counter; | |
4127 | snprintf(buf, sizeof buf, "gc%u", root_counter); | |
4128 | ++root_counter; | |
4129 | } | |
4130 | else | |
4131 | { | |
4132 | // Build a decl for a slice value initializer. An immutable slice | |
4133 | // value initializer may have to be copied to the heap if it | |
4134 | // contains pointers in a non-constant context. | |
4135 | snprintf(buf, sizeof buf, "C%u", counter); | |
4136 | ++counter; | |
4137 | ||
4138 | Array_type* at = this->expr_->type()->array_type(); | |
4139 | go_assert(at != NULL); | |
4140 | ||
4141 | // If we are not copying the value to the heap, we will only | |
4142 | // initialize the value once, so we can use this directly | |
4143 | // rather than copying it. In that case we can't make it | |
4144 | // read-only, because the program is permitted to change it. | |
4145 | copy_to_heap = (at->element_type()->has_pointer() | |
4146 | && !context->is_const()); | |
4147 | } | |
4148 | Bvariable* implicit = | |
aa5ae575 | 4149 | gogo->backend()->implicit_variable(buf, btype, true, copy_to_heap, |
5892f89f | 4150 | false, 0); |
aa5ae575 | 4151 | gogo->backend()->implicit_variable_set_init(implicit, buf, btype, |
4152 | true, copy_to_heap, false, | |
4153 | bexpr); | |
f23d7786 | 4154 | bexpr = gogo->backend()->var_expression(implicit, loc); |
76f85fd6 | 4155 | } |
4156 | else if ((this->expr_->is_composite_literal() | |
f9ca30f9 | 4157 | || this->expr_->string_expression() != NULL) |
4158 | && this->expr_->is_immutable()) | |
4159 | { | |
76f85fd6 | 4160 | // Build a decl for a constant constructor. |
f9ca30f9 | 4161 | snprintf(buf, sizeof buf, "C%u", counter); |
4162 | ++counter; | |
4163 | ||
4164 | Bvariable* decl = | |
4165 | gogo->backend()->immutable_struct(buf, true, false, btype, loc); | |
4166 | gogo->backend()->immutable_struct_set_init(decl, buf, true, false, | |
4167 | btype, loc, bexpr); | |
4168 | bexpr = gogo->backend()->var_expression(decl, loc); | |
4169 | } | |
09ea332d | 4170 | |
f9ca30f9 | 4171 | go_assert(!this->create_temp_ || this->expr_->is_variable()); |
4172 | ret = gogo->backend()->address_expression(bexpr, loc); | |
4173 | break; | |
e440a328 | 4174 | |
4175 | case OPERATOR_MULT: | |
4176 | { | |
f9ca30f9 | 4177 | go_assert(this->expr_->type()->points_to() != NULL); |
e440a328 | 4178 | |
4179 | // If we are dereferencing the pointer to a large struct, we | |
4180 | // need to check for nil. We don't bother to check for small | |
4181 | // structs because we expect the system to crash on a nil | |
56080003 | 4182 | // pointer dereference. However, if we know the address of this |
4183 | // expression is being taken, we must always check for nil. | |
f9ca30f9 | 4184 | |
4185 | Type* ptype = this->expr_->type()->points_to(); | |
4186 | Btype* pbtype = ptype->get_backend(gogo); | |
4187 | if (!ptype->is_void_type()) | |
e440a328 | 4188 | { |
2a305b85 | 4189 | int64_t s; |
4190 | bool ok = ptype->backend_type_size(gogo, &s); | |
4191 | if (!ok) | |
4192 | { | |
4193 | go_assert(saw_errors()); | |
4194 | return gogo->backend()->error_expression(); | |
4195 | } | |
f9ca30f9 | 4196 | if (s >= 4096 || this->issue_nil_check_) |
19b4f09b | 4197 | { |
f9ca30f9 | 4198 | go_assert(this->expr_->is_variable()); |
ea664253 | 4199 | Bexpression* nil = |
4200 | Expression::make_nil(loc)->get_backend(context); | |
f9ca30f9 | 4201 | Bexpression* compare = |
4202 | gogo->backend()->binary_expression(OPERATOR_EQEQ, bexpr, | |
4203 | nil, loc); | |
f9ca30f9 | 4204 | Bexpression* crash = |
ea664253 | 4205 | gogo->runtime_error(RUNTIME_ERROR_NIL_DEREFERENCE, |
4206 | loc)->get_backend(context); | |
f9ca30f9 | 4207 | bexpr = gogo->backend()->conditional_expression(btype, compare, |
4208 | crash, bexpr, | |
4209 | loc); | |
4210 | ||
19b4f09b | 4211 | } |
e440a328 | 4212 | } |
9b27b43c | 4213 | ret = gogo->backend()->indirect_expression(pbtype, bexpr, false, loc); |
e440a328 | 4214 | } |
f9ca30f9 | 4215 | break; |
e440a328 | 4216 | |
4217 | default: | |
c3e6f413 | 4218 | go_unreachable(); |
e440a328 | 4219 | } |
f9ca30f9 | 4220 | |
ea664253 | 4221 | return ret; |
e440a328 | 4222 | } |
4223 | ||
4224 | // Export a unary expression. | |
4225 | ||
4226 | void | |
4227 | Unary_expression::do_export(Export* exp) const | |
4228 | { | |
4229 | switch (this->op_) | |
4230 | { | |
4231 | case OPERATOR_PLUS: | |
4232 | exp->write_c_string("+ "); | |
4233 | break; | |
4234 | case OPERATOR_MINUS: | |
4235 | exp->write_c_string("- "); | |
4236 | break; | |
4237 | case OPERATOR_NOT: | |
4238 | exp->write_c_string("! "); | |
4239 | break; | |
4240 | case OPERATOR_XOR: | |
4241 | exp->write_c_string("^ "); | |
4242 | break; | |
4243 | case OPERATOR_AND: | |
4244 | case OPERATOR_MULT: | |
4245 | default: | |
c3e6f413 | 4246 | go_unreachable(); |
e440a328 | 4247 | } |
4248 | this->expr_->export_expression(exp); | |
4249 | } | |
4250 | ||
4251 | // Import a unary expression. | |
4252 | ||
4253 | Expression* | |
4254 | Unary_expression::do_import(Import* imp) | |
4255 | { | |
4256 | Operator op; | |
4257 | switch (imp->get_char()) | |
4258 | { | |
4259 | case '+': | |
4260 | op = OPERATOR_PLUS; | |
4261 | break; | |
4262 | case '-': | |
4263 | op = OPERATOR_MINUS; | |
4264 | break; | |
4265 | case '!': | |
4266 | op = OPERATOR_NOT; | |
4267 | break; | |
4268 | case '^': | |
4269 | op = OPERATOR_XOR; | |
4270 | break; | |
4271 | default: | |
c3e6f413 | 4272 | go_unreachable(); |
e440a328 | 4273 | } |
4274 | imp->require_c_string(" "); | |
4275 | Expression* expr = Expression::import_expression(imp); | |
4276 | return Expression::make_unary(op, expr, imp->location()); | |
4277 | } | |
4278 | ||
d751bb78 | 4279 | // Dump ast representation of an unary expression. |
4280 | ||
4281 | void | |
4282 | Unary_expression::do_dump_expression(Ast_dump_context* ast_dump_context) const | |
4283 | { | |
4284 | ast_dump_context->dump_operator(this->op_); | |
4285 | ast_dump_context->ostream() << "("; | |
4286 | ast_dump_context->dump_expression(this->expr_); | |
4287 | ast_dump_context->ostream() << ") "; | |
4288 | } | |
4289 | ||
e440a328 | 4290 | // Make a unary expression. |
4291 | ||
4292 | Expression* | |
b13c66cd | 4293 | Expression::make_unary(Operator op, Expression* expr, Location location) |
e440a328 | 4294 | { |
4295 | return new Unary_expression(op, expr, location); | |
4296 | } | |
4297 | ||
4298 | // If this is an indirection through a pointer, return the expression | |
4299 | // being pointed through. Otherwise return this. | |
4300 | ||
4301 | Expression* | |
4302 | Expression::deref() | |
4303 | { | |
4304 | if (this->classification_ == EXPRESSION_UNARY) | |
4305 | { | |
4306 | Unary_expression* ue = static_cast<Unary_expression*>(this); | |
4307 | if (ue->op() == OPERATOR_MULT) | |
4308 | return ue->operand(); | |
4309 | } | |
4310 | return this; | |
4311 | } | |
4312 | ||
4313 | // Class Binary_expression. | |
4314 | ||
4315 | // Traversal. | |
4316 | ||
4317 | int | |
4318 | Binary_expression::do_traverse(Traverse* traverse) | |
4319 | { | |
4320 | int t = Expression::traverse(&this->left_, traverse); | |
4321 | if (t == TRAVERSE_EXIT) | |
4322 | return TRAVERSE_EXIT; | |
4323 | return Expression::traverse(&this->right_, traverse); | |
4324 | } | |
4325 | ||
0c77715b | 4326 | // Return the type to use for a binary operation on operands of |
4327 | // LEFT_TYPE and RIGHT_TYPE. These are the types of constants and as | |
4328 | // such may be NULL or abstract. | |
4329 | ||
4330 | bool | |
4331 | Binary_expression::operation_type(Operator op, Type* left_type, | |
4332 | Type* right_type, Type** result_type) | |
4333 | { | |
4334 | if (left_type != right_type | |
4335 | && !left_type->is_abstract() | |
4336 | && !right_type->is_abstract() | |
4337 | && left_type->base() != right_type->base() | |
4338 | && op != OPERATOR_LSHIFT | |
4339 | && op != OPERATOR_RSHIFT) | |
4340 | { | |
4341 | // May be a type error--let it be diagnosed elsewhere. | |
4342 | return false; | |
4343 | } | |
4344 | ||
4345 | if (op == OPERATOR_LSHIFT || op == OPERATOR_RSHIFT) | |
4346 | { | |
4347 | if (left_type->integer_type() != NULL) | |
4348 | *result_type = left_type; | |
4349 | else | |
4350 | *result_type = Type::make_abstract_integer_type(); | |
4351 | } | |
4352 | else if (!left_type->is_abstract() && left_type->named_type() != NULL) | |
4353 | *result_type = left_type; | |
4354 | else if (!right_type->is_abstract() && right_type->named_type() != NULL) | |
4355 | *result_type = right_type; | |
4356 | else if (!left_type->is_abstract()) | |
4357 | *result_type = left_type; | |
4358 | else if (!right_type->is_abstract()) | |
4359 | *result_type = right_type; | |
4360 | else if (left_type->complex_type() != NULL) | |
4361 | *result_type = left_type; | |
4362 | else if (right_type->complex_type() != NULL) | |
4363 | *result_type = right_type; | |
4364 | else if (left_type->float_type() != NULL) | |
4365 | *result_type = left_type; | |
4366 | else if (right_type->float_type() != NULL) | |
4367 | *result_type = right_type; | |
4368 | else if (left_type->integer_type() != NULL | |
4369 | && left_type->integer_type()->is_rune()) | |
4370 | *result_type = left_type; | |
4371 | else if (right_type->integer_type() != NULL | |
4372 | && right_type->integer_type()->is_rune()) | |
4373 | *result_type = right_type; | |
4374 | else | |
4375 | *result_type = left_type; | |
4376 | ||
4377 | return true; | |
4378 | } | |
4379 | ||
4380 | // Convert an integer comparison code and an operator to a boolean | |
4381 | // value. | |
e440a328 | 4382 | |
4383 | bool | |
0c77715b | 4384 | Binary_expression::cmp_to_bool(Operator op, int cmp) |
e440a328 | 4385 | { |
e440a328 | 4386 | switch (op) |
4387 | { | |
4388 | case OPERATOR_EQEQ: | |
0c77715b | 4389 | return cmp == 0; |
4390 | break; | |
e440a328 | 4391 | case OPERATOR_NOTEQ: |
0c77715b | 4392 | return cmp != 0; |
4393 | break; | |
e440a328 | 4394 | case OPERATOR_LT: |
0c77715b | 4395 | return cmp < 0; |
4396 | break; | |
e440a328 | 4397 | case OPERATOR_LE: |
0c77715b | 4398 | return cmp <= 0; |
e440a328 | 4399 | case OPERATOR_GT: |
0c77715b | 4400 | return cmp > 0; |
e440a328 | 4401 | case OPERATOR_GE: |
0c77715b | 4402 | return cmp >= 0; |
e440a328 | 4403 | default: |
c3e6f413 | 4404 | go_unreachable(); |
e440a328 | 4405 | } |
4406 | } | |
4407 | ||
0c77715b | 4408 | // Compare constants according to OP. |
e440a328 | 4409 | |
4410 | bool | |
0c77715b | 4411 | Binary_expression::compare_constant(Operator op, Numeric_constant* left_nc, |
4412 | Numeric_constant* right_nc, | |
4413 | Location location, bool* result) | |
e440a328 | 4414 | { |
0c77715b | 4415 | Type* left_type = left_nc->type(); |
4416 | Type* right_type = right_nc->type(); | |
4417 | ||
4418 | Type* type; | |
4419 | if (!Binary_expression::operation_type(op, left_type, right_type, &type)) | |
4420 | return false; | |
4421 | ||
4422 | // When comparing an untyped operand to a typed operand, we are | |
4423 | // effectively coercing the untyped operand to the other operand's | |
4424 | // type, so make sure that is valid. | |
4425 | if (!left_nc->set_type(type, true, location) | |
4426 | || !right_nc->set_type(type, true, location)) | |
4427 | return false; | |
4428 | ||
4429 | bool ret; | |
4430 | int cmp; | |
4431 | if (type->complex_type() != NULL) | |
4432 | { | |
4433 | if (op != OPERATOR_EQEQ && op != OPERATOR_NOTEQ) | |
4434 | return false; | |
4435 | ret = Binary_expression::compare_complex(left_nc, right_nc, &cmp); | |
4436 | } | |
4437 | else if (type->float_type() != NULL) | |
4438 | ret = Binary_expression::compare_float(left_nc, right_nc, &cmp); | |
e440a328 | 4439 | else |
0c77715b | 4440 | ret = Binary_expression::compare_integer(left_nc, right_nc, &cmp); |
4441 | ||
4442 | if (ret) | |
4443 | *result = Binary_expression::cmp_to_bool(op, cmp); | |
4444 | ||
4445 | return ret; | |
4446 | } | |
4447 | ||
4448 | // Compare integer constants. | |
4449 | ||
4450 | bool | |
4451 | Binary_expression::compare_integer(const Numeric_constant* left_nc, | |
4452 | const Numeric_constant* right_nc, | |
4453 | int* cmp) | |
4454 | { | |
4455 | mpz_t left_val; | |
4456 | if (!left_nc->to_int(&left_val)) | |
4457 | return false; | |
4458 | mpz_t right_val; | |
4459 | if (!right_nc->to_int(&right_val)) | |
e440a328 | 4460 | { |
0c77715b | 4461 | mpz_clear(left_val); |
4462 | return false; | |
e440a328 | 4463 | } |
0c77715b | 4464 | |
4465 | *cmp = mpz_cmp(left_val, right_val); | |
4466 | ||
4467 | mpz_clear(left_val); | |
4468 | mpz_clear(right_val); | |
4469 | ||
4470 | return true; | |
4471 | } | |
4472 | ||
4473 | // Compare floating point constants. | |
4474 | ||
4475 | bool | |
4476 | Binary_expression::compare_float(const Numeric_constant* left_nc, | |
4477 | const Numeric_constant* right_nc, | |
4478 | int* cmp) | |
4479 | { | |
4480 | mpfr_t left_val; | |
4481 | if (!left_nc->to_float(&left_val)) | |
4482 | return false; | |
4483 | mpfr_t right_val; | |
4484 | if (!right_nc->to_float(&right_val)) | |
e440a328 | 4485 | { |
0c77715b | 4486 | mpfr_clear(left_val); |
4487 | return false; | |
4488 | } | |
4489 | ||
4490 | // We already coerced both operands to the same type. If that type | |
4491 | // is not an abstract type, we need to round the values accordingly. | |
4492 | Type* type = left_nc->type(); | |
4493 | if (!type->is_abstract() && type->float_type() != NULL) | |
4494 | { | |
4495 | int bits = type->float_type()->bits(); | |
4496 | mpfr_prec_round(left_val, bits, GMP_RNDN); | |
4497 | mpfr_prec_round(right_val, bits, GMP_RNDN); | |
e440a328 | 4498 | } |
0c77715b | 4499 | |
4500 | *cmp = mpfr_cmp(left_val, right_val); | |
4501 | ||
4502 | mpfr_clear(left_val); | |
4503 | mpfr_clear(right_val); | |
4504 | ||
4505 | return true; | |
e440a328 | 4506 | } |
4507 | ||
0c77715b | 4508 | // Compare complex constants. Complex numbers may only be compared |
4509 | // for equality. | |
e440a328 | 4510 | |
4511 | bool | |
0c77715b | 4512 | Binary_expression::compare_complex(const Numeric_constant* left_nc, |
4513 | const Numeric_constant* right_nc, | |
4514 | int* cmp) | |
e440a328 | 4515 | { |
fcbea5e4 | 4516 | mpc_t left_val; |
4517 | if (!left_nc->to_complex(&left_val)) | |
0c77715b | 4518 | return false; |
fcbea5e4 | 4519 | mpc_t right_val; |
4520 | if (!right_nc->to_complex(&right_val)) | |
e440a328 | 4521 | { |
fcbea5e4 | 4522 | mpc_clear(left_val); |
0c77715b | 4523 | return false; |
e440a328 | 4524 | } |
0c77715b | 4525 | |
4526 | // We already coerced both operands to the same type. If that type | |
4527 | // is not an abstract type, we need to round the values accordingly. | |
4528 | Type* type = left_nc->type(); | |
4529 | if (!type->is_abstract() && type->complex_type() != NULL) | |
e440a328 | 4530 | { |
0c77715b | 4531 | int bits = type->complex_type()->bits(); |
fcbea5e4 | 4532 | mpfr_prec_round(mpc_realref(left_val), bits / 2, GMP_RNDN); |
4533 | mpfr_prec_round(mpc_imagref(left_val), bits / 2, GMP_RNDN); | |
4534 | mpfr_prec_round(mpc_realref(right_val), bits / 2, GMP_RNDN); | |
4535 | mpfr_prec_round(mpc_imagref(right_val), bits / 2, GMP_RNDN); | |
e440a328 | 4536 | } |
0c77715b | 4537 | |
fcbea5e4 | 4538 | *cmp = mpc_cmp(left_val, right_val) != 0; |
0c77715b | 4539 | |
fcbea5e4 | 4540 | mpc_clear(left_val); |
4541 | mpc_clear(right_val); | |
0c77715b | 4542 | |
4543 | return true; | |
e440a328 | 4544 | } |
4545 | ||
0c77715b | 4546 | // Apply binary opcode OP to LEFT_NC and RIGHT_NC, setting NC. Return |
4547 | // true if this could be done, false if not. Issue errors at LOCATION | |
4548 | // as appropriate. | |
e440a328 | 4549 | |
4550 | bool | |
0c77715b | 4551 | Binary_expression::eval_constant(Operator op, Numeric_constant* left_nc, |
4552 | Numeric_constant* right_nc, | |
4553 | Location location, Numeric_constant* nc) | |
e440a328 | 4554 | { |
e440a328 | 4555 | switch (op) |
4556 | { | |
4557 | case OPERATOR_OROR: | |
4558 | case OPERATOR_ANDAND: | |
4559 | case OPERATOR_EQEQ: | |
4560 | case OPERATOR_NOTEQ: | |
4561 | case OPERATOR_LT: | |
4562 | case OPERATOR_LE: | |
4563 | case OPERATOR_GT: | |
4564 | case OPERATOR_GE: | |
9767e2d3 | 4565 | // These return boolean values, not numeric. |
4566 | return false; | |
0c77715b | 4567 | default: |
4568 | break; | |
4569 | } | |
4570 | ||
4571 | Type* left_type = left_nc->type(); | |
4572 | Type* right_type = right_nc->type(); | |
4573 | ||
4574 | Type* type; | |
4575 | if (!Binary_expression::operation_type(op, left_type, right_type, &type)) | |
4576 | return false; | |
4577 | ||
4578 | bool is_shift = op == OPERATOR_LSHIFT || op == OPERATOR_RSHIFT; | |
4579 | ||
4580 | // When combining an untyped operand with a typed operand, we are | |
4581 | // effectively coercing the untyped operand to the other operand's | |
4582 | // type, so make sure that is valid. | |
4583 | if (!left_nc->set_type(type, true, location)) | |
4584 | return false; | |
4585 | if (!is_shift && !right_nc->set_type(type, true, location)) | |
4586 | return false; | |
85334a21 | 4587 | if (is_shift |
4588 | && ((left_type->integer_type() == NULL | |
4589 | && !left_type->is_abstract()) | |
4590 | || (right_type->integer_type() == NULL | |
4591 | && !right_type->is_abstract()))) | |
4592 | return false; | |
0c77715b | 4593 | |
4594 | bool r; | |
4595 | if (type->complex_type() != NULL) | |
4596 | r = Binary_expression::eval_complex(op, left_nc, right_nc, location, nc); | |
4597 | else if (type->float_type() != NULL) | |
4598 | r = Binary_expression::eval_float(op, left_nc, right_nc, location, nc); | |
4599 | else | |
4600 | r = Binary_expression::eval_integer(op, left_nc, right_nc, location, nc); | |
4601 | ||
4602 | if (r) | |
4603 | r = nc->set_type(type, true, location); | |
4604 | ||
4605 | return r; | |
4606 | } | |
4607 | ||
4608 | // Apply binary opcode OP to LEFT_NC and RIGHT_NC, setting NC, using | |
4609 | // integer operations. Return true if this could be done, false if | |
4610 | // not. | |
4611 | ||
4612 | bool | |
4613 | Binary_expression::eval_integer(Operator op, const Numeric_constant* left_nc, | |
4614 | const Numeric_constant* right_nc, | |
4615 | Location location, Numeric_constant* nc) | |
4616 | { | |
4617 | mpz_t left_val; | |
4618 | if (!left_nc->to_int(&left_val)) | |
4619 | return false; | |
4620 | mpz_t right_val; | |
4621 | if (!right_nc->to_int(&right_val)) | |
4622 | { | |
4623 | mpz_clear(left_val); | |
e440a328 | 4624 | return false; |
0c77715b | 4625 | } |
4626 | ||
4627 | mpz_t val; | |
4628 | mpz_init(val); | |
4629 | ||
4630 | switch (op) | |
4631 | { | |
e440a328 | 4632 | case OPERATOR_PLUS: |
4633 | mpz_add(val, left_val, right_val); | |
2c809f8f | 4634 | if (mpz_sizeinbase(val, 2) > 0x100000) |
4635 | { | |
4636 | error_at(location, "constant addition overflow"); | |
71a45216 | 4637 | nc->set_invalid(); |
2c809f8f | 4638 | mpz_set_ui(val, 1); |
4639 | } | |
e440a328 | 4640 | break; |
4641 | case OPERATOR_MINUS: | |
4642 | mpz_sub(val, left_val, right_val); | |
2c809f8f | 4643 | if (mpz_sizeinbase(val, 2) > 0x100000) |
4644 | { | |
4645 | error_at(location, "constant subtraction overflow"); | |
71a45216 | 4646 | nc->set_invalid(); |
2c809f8f | 4647 | mpz_set_ui(val, 1); |
4648 | } | |
e440a328 | 4649 | break; |
4650 | case OPERATOR_OR: | |
4651 | mpz_ior(val, left_val, right_val); | |
4652 | break; | |
4653 | case OPERATOR_XOR: | |
4654 | mpz_xor(val, left_val, right_val); | |
4655 | break; | |
4656 | case OPERATOR_MULT: | |
4657 | mpz_mul(val, left_val, right_val); | |
2c809f8f | 4658 | if (mpz_sizeinbase(val, 2) > 0x100000) |
4659 | { | |
4660 | error_at(location, "constant multiplication overflow"); | |
71a45216 | 4661 | nc->set_invalid(); |
2c809f8f | 4662 | mpz_set_ui(val, 1); |
4663 | } | |
e440a328 | 4664 | break; |
4665 | case OPERATOR_DIV: | |
4666 | if (mpz_sgn(right_val) != 0) | |
4667 | mpz_tdiv_q(val, left_val, right_val); | |
4668 | else | |
4669 | { | |
4670 | error_at(location, "division by zero"); | |
71a45216 | 4671 | nc->set_invalid(); |
e440a328 | 4672 | mpz_set_ui(val, 0); |
e440a328 | 4673 | } |
4674 | break; | |
4675 | case OPERATOR_MOD: | |
4676 | if (mpz_sgn(right_val) != 0) | |
4677 | mpz_tdiv_r(val, left_val, right_val); | |
4678 | else | |
4679 | { | |
4680 | error_at(location, "division by zero"); | |
71a45216 | 4681 | nc->set_invalid(); |
e440a328 | 4682 | mpz_set_ui(val, 0); |
e440a328 | 4683 | } |
4684 | break; | |
4685 | case OPERATOR_LSHIFT: | |
4686 | { | |
4687 | unsigned long shift = mpz_get_ui(right_val); | |
0c77715b | 4688 | if (mpz_cmp_ui(right_val, shift) == 0 && shift <= 0x100000) |
4689 | mpz_mul_2exp(val, left_val, shift); | |
4690 | else | |
e440a328 | 4691 | { |
4692 | error_at(location, "shift count overflow"); | |
71a45216 | 4693 | nc->set_invalid(); |
2c809f8f | 4694 | mpz_set_ui(val, 1); |
e440a328 | 4695 | } |
e440a328 | 4696 | break; |
4697 | } | |
4698 | break; | |
4699 | case OPERATOR_RSHIFT: | |
4700 | { | |
4701 | unsigned long shift = mpz_get_ui(right_val); | |
4702 | if (mpz_cmp_ui(right_val, shift) != 0) | |
4703 | { | |
4704 | error_at(location, "shift count overflow"); | |
71a45216 | 4705 | nc->set_invalid(); |
2c809f8f | 4706 | mpz_set_ui(val, 1); |
e440a328 | 4707 | } |
e440a328 | 4708 | else |
0c77715b | 4709 | { |
4710 | if (mpz_cmp_ui(left_val, 0) >= 0) | |
4711 | mpz_tdiv_q_2exp(val, left_val, shift); | |
4712 | else | |
4713 | mpz_fdiv_q_2exp(val, left_val, shift); | |
4714 | } | |
e440a328 | 4715 | break; |
4716 | } | |
4717 | break; | |
4718 | case OPERATOR_AND: | |
4719 | mpz_and(val, left_val, right_val); | |
4720 | break; | |
4721 | case OPERATOR_BITCLEAR: | |
4722 | { | |
4723 | mpz_t tval; | |
4724 | mpz_init(tval); | |
4725 | mpz_com(tval, right_val); | |
4726 | mpz_and(val, left_val, tval); | |
4727 | mpz_clear(tval); | |
4728 | } | |
4729 | break; | |
4730 | default: | |
c3e6f413 | 4731 | go_unreachable(); |
e440a328 | 4732 | } |
4733 | ||
0c77715b | 4734 | mpz_clear(left_val); |
4735 | mpz_clear(right_val); | |
e440a328 | 4736 | |
0c77715b | 4737 | if (left_nc->is_rune() |
4738 | || (op != OPERATOR_LSHIFT | |
4739 | && op != OPERATOR_RSHIFT | |
4740 | && right_nc->is_rune())) | |
4741 | nc->set_rune(NULL, val); | |
4742 | else | |
4743 | nc->set_int(NULL, val); | |
4744 | ||
4745 | mpz_clear(val); | |
e440a328 | 4746 | |
4747 | return true; | |
4748 | } | |
4749 | ||
0c77715b | 4750 | // Apply binary opcode OP to LEFT_NC and RIGHT_NC, setting NC, using |
4751 | // floating point operations. Return true if this could be done, | |
4752 | // false if not. | |
e440a328 | 4753 | |
4754 | bool | |
0c77715b | 4755 | Binary_expression::eval_float(Operator op, const Numeric_constant* left_nc, |
4756 | const Numeric_constant* right_nc, | |
4757 | Location location, Numeric_constant* nc) | |
e440a328 | 4758 | { |
0c77715b | 4759 | mpfr_t left_val; |
4760 | if (!left_nc->to_float(&left_val)) | |
4761 | return false; | |
4762 | mpfr_t right_val; | |
4763 | if (!right_nc->to_float(&right_val)) | |
e440a328 | 4764 | { |
0c77715b | 4765 | mpfr_clear(left_val); |
e440a328 | 4766 | return false; |
0c77715b | 4767 | } |
4768 | ||
4769 | mpfr_t val; | |
4770 | mpfr_init(val); | |
4771 | ||
4772 | bool ret = true; | |
4773 | switch (op) | |
4774 | { | |
e440a328 | 4775 | case OPERATOR_PLUS: |
4776 | mpfr_add(val, left_val, right_val, GMP_RNDN); | |
4777 | break; | |
4778 | case OPERATOR_MINUS: | |
4779 | mpfr_sub(val, left_val, right_val, GMP_RNDN); | |
4780 | break; | |
4781 | case OPERATOR_OR: | |
4782 | case OPERATOR_XOR: | |
4783 | case OPERATOR_AND: | |
4784 | case OPERATOR_BITCLEAR: | |
0c77715b | 4785 | case OPERATOR_MOD: |
4786 | case OPERATOR_LSHIFT: | |
4787 | case OPERATOR_RSHIFT: | |
4788 | mpfr_set_ui(val, 0, GMP_RNDN); | |
4789 | ret = false; | |
4790 | break; | |
e440a328 | 4791 | case OPERATOR_MULT: |
4792 | mpfr_mul(val, left_val, right_val, GMP_RNDN); | |
4793 | break; | |
4794 | case OPERATOR_DIV: | |
0c77715b | 4795 | if (!mpfr_zero_p(right_val)) |
4796 | mpfr_div(val, left_val, right_val, GMP_RNDN); | |
4797 | else | |
4798 | { | |
4799 | error_at(location, "division by zero"); | |
71a45216 | 4800 | nc->set_invalid(); |
0c77715b | 4801 | mpfr_set_ui(val, 0, GMP_RNDN); |
4802 | } | |
e440a328 | 4803 | break; |
e440a328 | 4804 | default: |
c3e6f413 | 4805 | go_unreachable(); |
e440a328 | 4806 | } |
4807 | ||
0c77715b | 4808 | mpfr_clear(left_val); |
4809 | mpfr_clear(right_val); | |
e440a328 | 4810 | |
0c77715b | 4811 | nc->set_float(NULL, val); |
4812 | mpfr_clear(val); | |
e440a328 | 4813 | |
0c77715b | 4814 | return ret; |
e440a328 | 4815 | } |
4816 | ||
0c77715b | 4817 | // Apply binary opcode OP to LEFT_NC and RIGHT_NC, setting NC, using |
4818 | // complex operations. Return true if this could be done, false if | |
4819 | // not. | |
e440a328 | 4820 | |
4821 | bool | |
0c77715b | 4822 | Binary_expression::eval_complex(Operator op, const Numeric_constant* left_nc, |
4823 | const Numeric_constant* right_nc, | |
4824 | Location location, Numeric_constant* nc) | |
e440a328 | 4825 | { |
fcbea5e4 | 4826 | mpc_t left_val; |
4827 | if (!left_nc->to_complex(&left_val)) | |
0c77715b | 4828 | return false; |
fcbea5e4 | 4829 | mpc_t right_val; |
4830 | if (!right_nc->to_complex(&right_val)) | |
e440a328 | 4831 | { |
fcbea5e4 | 4832 | mpc_clear(left_val); |
e440a328 | 4833 | return false; |
0c77715b | 4834 | } |
4835 | ||
fcbea5e4 | 4836 | mpc_t val; |
4837 | mpc_init2(val, mpc_precision); | |
0c77715b | 4838 | |
4839 | bool ret = true; | |
4840 | switch (op) | |
4841 | { | |
e440a328 | 4842 | case OPERATOR_PLUS: |
fcbea5e4 | 4843 | mpc_add(val, left_val, right_val, MPC_RNDNN); |
e440a328 | 4844 | break; |
4845 | case OPERATOR_MINUS: | |
fcbea5e4 | 4846 | mpc_sub(val, left_val, right_val, MPC_RNDNN); |
e440a328 | 4847 | break; |
4848 | case OPERATOR_OR: | |
4849 | case OPERATOR_XOR: | |
4850 | case OPERATOR_AND: | |
4851 | case OPERATOR_BITCLEAR: | |
0c77715b | 4852 | case OPERATOR_MOD: |
4853 | case OPERATOR_LSHIFT: | |
4854 | case OPERATOR_RSHIFT: | |
fcbea5e4 | 4855 | mpc_set_ui(val, 0, MPC_RNDNN); |
0c77715b | 4856 | ret = false; |
4857 | break; | |
e440a328 | 4858 | case OPERATOR_MULT: |
fcbea5e4 | 4859 | mpc_mul(val, left_val, right_val, MPC_RNDNN); |
e440a328 | 4860 | break; |
4861 | case OPERATOR_DIV: | |
fcbea5e4 | 4862 | if (mpc_cmp_si(right_val, 0) == 0) |
4863 | { | |
4864 | error_at(location, "division by zero"); | |
71a45216 | 4865 | nc->set_invalid(); |
fcbea5e4 | 4866 | mpc_set_ui(val, 0, MPC_RNDNN); |
4867 | break; | |
4868 | } | |
4869 | mpc_div(val, left_val, right_val, MPC_RNDNN); | |
e440a328 | 4870 | break; |
e440a328 | 4871 | default: |
c3e6f413 | 4872 | go_unreachable(); |
e440a328 | 4873 | } |
4874 | ||
fcbea5e4 | 4875 | mpc_clear(left_val); |
4876 | mpc_clear(right_val); | |
e440a328 | 4877 | |
fcbea5e4 | 4878 | nc->set_complex(NULL, val); |
4879 | mpc_clear(val); | |
e440a328 | 4880 | |
0c77715b | 4881 | return ret; |
e440a328 | 4882 | } |
4883 | ||
4884 | // Lower a binary expression. We have to evaluate constant | |
4885 | // expressions now, in order to implement Go's unlimited precision | |
4886 | // constants. | |
4887 | ||
4888 | Expression* | |
e9d3367e | 4889 | Binary_expression::do_lower(Gogo* gogo, Named_object*, |
4890 | Statement_inserter* inserter, int) | |
e440a328 | 4891 | { |
b13c66cd | 4892 | Location location = this->location(); |
e440a328 | 4893 | Operator op = this->op_; |
4894 | Expression* left = this->left_; | |
4895 | Expression* right = this->right_; | |
4896 | ||
4897 | const bool is_comparison = (op == OPERATOR_EQEQ | |
4898 | || op == OPERATOR_NOTEQ | |
4899 | || op == OPERATOR_LT | |
4900 | || op == OPERATOR_LE | |
4901 | || op == OPERATOR_GT | |
4902 | || op == OPERATOR_GE); | |
4903 | ||
0c77715b | 4904 | // Numeric constant expressions. |
e440a328 | 4905 | { |
0c77715b | 4906 | Numeric_constant left_nc; |
4907 | Numeric_constant right_nc; | |
4908 | if (left->numeric_constant_value(&left_nc) | |
4909 | && right->numeric_constant_value(&right_nc)) | |
e440a328 | 4910 | { |
0c77715b | 4911 | if (is_comparison) |
e440a328 | 4912 | { |
0c77715b | 4913 | bool result; |
4914 | if (!Binary_expression::compare_constant(op, &left_nc, | |
4915 | &right_nc, location, | |
4916 | &result)) | |
4917 | return this; | |
e90c9dfc | 4918 | return Expression::make_cast(Type::make_boolean_type(), |
0c77715b | 4919 | Expression::make_boolean(result, |
4920 | location), | |
4921 | location); | |
e440a328 | 4922 | } |
4923 | else | |
4924 | { | |
0c77715b | 4925 | Numeric_constant nc; |
4926 | if (!Binary_expression::eval_constant(op, &left_nc, &right_nc, | |
4927 | location, &nc)) | |
71a45216 | 4928 | return this; |
0c77715b | 4929 | return nc.expression(location); |
e440a328 | 4930 | } |
4931 | } | |
e440a328 | 4932 | } |
4933 | ||
4934 | // String constant expressions. | |
315fa98d | 4935 | if (left->type()->is_string_type() && right->type()->is_string_type()) |
e440a328 | 4936 | { |
4937 | std::string left_string; | |
4938 | std::string right_string; | |
4939 | if (left->string_constant_value(&left_string) | |
4940 | && right->string_constant_value(&right_string)) | |
315fa98d | 4941 | { |
4942 | if (op == OPERATOR_PLUS) | |
4943 | return Expression::make_string(left_string + right_string, | |
4944 | location); | |
4945 | else if (is_comparison) | |
4946 | { | |
4947 | int cmp = left_string.compare(right_string); | |
0c77715b | 4948 | bool r = Binary_expression::cmp_to_bool(op, cmp); |
e90c9dfc | 4949 | return Expression::make_boolean(r, location); |
b40dc774 | 4950 | } |
4951 | } | |
b40dc774 | 4952 | } |
4953 | ||
ceeb12d7 | 4954 | // Lower struct, array, and some interface comparisons. |
e9d3367e | 4955 | if (op == OPERATOR_EQEQ || op == OPERATOR_NOTEQ) |
4956 | { | |
b79832ca | 4957 | if (left->type()->struct_type() != NULL |
4958 | && right->type()->struct_type() != NULL) | |
e9d3367e | 4959 | return this->lower_struct_comparison(gogo, inserter); |
4960 | else if (left->type()->array_type() != NULL | |
b79832ca | 4961 | && !left->type()->is_slice_type() |
4962 | && right->type()->array_type() != NULL | |
4963 | && !right->type()->is_slice_type()) | |
e9d3367e | 4964 | return this->lower_array_comparison(gogo, inserter); |
ceeb12d7 | 4965 | else if ((left->type()->interface_type() != NULL |
4966 | && right->type()->interface_type() == NULL) | |
4967 | || (left->type()->interface_type() == NULL | |
4968 | && right->type()->interface_type() != NULL)) | |
4969 | return this->lower_interface_value_comparison(gogo, inserter); | |
e9d3367e | 4970 | } |
4971 | ||
e440a328 | 4972 | return this; |
4973 | } | |
4974 | ||
e9d3367e | 4975 | // Lower a struct comparison. |
4976 | ||
4977 | Expression* | |
4978 | Binary_expression::lower_struct_comparison(Gogo* gogo, | |
4979 | Statement_inserter* inserter) | |
4980 | { | |
4981 | Struct_type* st = this->left_->type()->struct_type(); | |
4982 | Struct_type* st2 = this->right_->type()->struct_type(); | |
4983 | if (st2 == NULL) | |
4984 | return this; | |
4985 | if (st != st2 && !Type::are_identical(st, st2, false, NULL)) | |
4986 | return this; | |
4987 | if (!Type::are_compatible_for_comparison(true, this->left_->type(), | |
4988 | this->right_->type(), NULL)) | |
4989 | return this; | |
4990 | ||
4991 | // See if we can compare using memcmp. As a heuristic, we use | |
4992 | // memcmp rather than field references and comparisons if there are | |
4993 | // more than two fields. | |
113ef6a5 | 4994 | if (st->compare_is_identity(gogo) && st->total_field_count() > 2) |
e9d3367e | 4995 | return this->lower_compare_to_memcmp(gogo, inserter); |
4996 | ||
4997 | Location loc = this->location(); | |
4998 | ||
4999 | Expression* left = this->left_; | |
5000 | Temporary_statement* left_temp = NULL; | |
5001 | if (left->var_expression() == NULL | |
5002 | && left->temporary_reference_expression() == NULL) | |
5003 | { | |
5004 | left_temp = Statement::make_temporary(left->type(), NULL, loc); | |
5005 | inserter->insert(left_temp); | |
5006 | left = Expression::make_set_and_use_temporary(left_temp, left, loc); | |
5007 | } | |
5008 | ||
5009 | Expression* right = this->right_; | |
5010 | Temporary_statement* right_temp = NULL; | |
5011 | if (right->var_expression() == NULL | |
5012 | && right->temporary_reference_expression() == NULL) | |
5013 | { | |
5014 | right_temp = Statement::make_temporary(right->type(), NULL, loc); | |
5015 | inserter->insert(right_temp); | |
5016 | right = Expression::make_set_and_use_temporary(right_temp, right, loc); | |
5017 | } | |
5018 | ||
5019 | Expression* ret = Expression::make_boolean(true, loc); | |
5020 | const Struct_field_list* fields = st->fields(); | |
5021 | unsigned int field_index = 0; | |
5022 | for (Struct_field_list::const_iterator pf = fields->begin(); | |
5023 | pf != fields->end(); | |
5024 | ++pf, ++field_index) | |
5025 | { | |
f5165c05 | 5026 | if (Gogo::is_sink_name(pf->field_name())) |
5027 | continue; | |
5028 | ||
e9d3367e | 5029 | if (field_index > 0) |
5030 | { | |
5031 | if (left_temp == NULL) | |
5032 | left = left->copy(); | |
5033 | else | |
5034 | left = Expression::make_temporary_reference(left_temp, loc); | |
5035 | if (right_temp == NULL) | |
5036 | right = right->copy(); | |
5037 | else | |
5038 | right = Expression::make_temporary_reference(right_temp, loc); | |
5039 | } | |
5040 | Expression* f1 = Expression::make_field_reference(left, field_index, | |
5041 | loc); | |
5042 | Expression* f2 = Expression::make_field_reference(right, field_index, | |
5043 | loc); | |
5044 | Expression* cond = Expression::make_binary(OPERATOR_EQEQ, f1, f2, loc); | |
5045 | ret = Expression::make_binary(OPERATOR_ANDAND, ret, cond, loc); | |
5046 | } | |
5047 | ||
5048 | if (this->op_ == OPERATOR_NOTEQ) | |
5049 | ret = Expression::make_unary(OPERATOR_NOT, ret, loc); | |
5050 | ||
5051 | return ret; | |
5052 | } | |
5053 | ||
5054 | // Lower an array comparison. | |
5055 | ||
5056 | Expression* | |
5057 | Binary_expression::lower_array_comparison(Gogo* gogo, | |
5058 | Statement_inserter* inserter) | |
5059 | { | |
5060 | Array_type* at = this->left_->type()->array_type(); | |
5061 | Array_type* at2 = this->right_->type()->array_type(); | |
5062 | if (at2 == NULL) | |
5063 | return this; | |
5064 | if (at != at2 && !Type::are_identical(at, at2, false, NULL)) | |
5065 | return this; | |
5066 | if (!Type::are_compatible_for_comparison(true, this->left_->type(), | |
5067 | this->right_->type(), NULL)) | |
5068 | return this; | |
5069 | ||
5070 | // Call memcmp directly if possible. This may let the middle-end | |
5071 | // optimize the call. | |
113ef6a5 | 5072 | if (at->compare_is_identity(gogo)) |
e9d3367e | 5073 | return this->lower_compare_to_memcmp(gogo, inserter); |
5074 | ||
5075 | // Call the array comparison function. | |
5076 | Named_object* hash_fn; | |
5077 | Named_object* equal_fn; | |
5078 | at->type_functions(gogo, this->left_->type()->named_type(), NULL, NULL, | |
5079 | &hash_fn, &equal_fn); | |
5080 | ||
5081 | Location loc = this->location(); | |
5082 | ||
5083 | Expression* func = Expression::make_func_reference(equal_fn, NULL, loc); | |
5084 | ||
5085 | Expression_list* args = new Expression_list(); | |
5086 | args->push_back(this->operand_address(inserter, this->left_)); | |
5087 | args->push_back(this->operand_address(inserter, this->right_)); | |
5088 | args->push_back(Expression::make_type_info(at, TYPE_INFO_SIZE)); | |
5089 | ||
5090 | Expression* ret = Expression::make_call(func, args, false, loc); | |
5091 | ||
5092 | if (this->op_ == OPERATOR_NOTEQ) | |
5093 | ret = Expression::make_unary(OPERATOR_NOT, ret, loc); | |
5094 | ||
5095 | return ret; | |
5096 | } | |
5097 | ||
ceeb12d7 | 5098 | // Lower an interface to value comparison. |
5099 | ||
5100 | Expression* | |
5101 | Binary_expression::lower_interface_value_comparison(Gogo*, | |
5102 | Statement_inserter* inserter) | |
5103 | { | |
5104 | Type* left_type = this->left_->type(); | |
5105 | Type* right_type = this->right_->type(); | |
5106 | Interface_type* ift; | |
5107 | if (left_type->interface_type() != NULL) | |
5108 | { | |
5109 | ift = left_type->interface_type(); | |
5110 | if (!ift->implements_interface(right_type, NULL)) | |
5111 | return this; | |
5112 | } | |
5113 | else | |
5114 | { | |
5115 | ift = right_type->interface_type(); | |
5116 | if (!ift->implements_interface(left_type, NULL)) | |
5117 | return this; | |
5118 | } | |
5119 | if (!Type::are_compatible_for_comparison(true, left_type, right_type, NULL)) | |
5120 | return this; | |
5121 | ||
5122 | Location loc = this->location(); | |
5123 | ||
5124 | if (left_type->interface_type() == NULL | |
5125 | && left_type->points_to() == NULL | |
5126 | && !this->left_->is_addressable()) | |
5127 | { | |
5128 | Temporary_statement* temp = | |
5129 | Statement::make_temporary(left_type, NULL, loc); | |
5130 | inserter->insert(temp); | |
5131 | this->left_ = | |
5132 | Expression::make_set_and_use_temporary(temp, this->left_, loc); | |
5133 | } | |
5134 | ||
5135 | if (right_type->interface_type() == NULL | |
5136 | && right_type->points_to() == NULL | |
5137 | && !this->right_->is_addressable()) | |
5138 | { | |
5139 | Temporary_statement* temp = | |
5140 | Statement::make_temporary(right_type, NULL, loc); | |
5141 | inserter->insert(temp); | |
5142 | this->right_ = | |
5143 | Expression::make_set_and_use_temporary(temp, this->right_, loc); | |
5144 | } | |
5145 | ||
5146 | return this; | |
5147 | } | |
5148 | ||
e9d3367e | 5149 | // Lower a struct or array comparison to a call to memcmp. |
5150 | ||
5151 | Expression* | |
5152 | Binary_expression::lower_compare_to_memcmp(Gogo*, Statement_inserter* inserter) | |
5153 | { | |
5154 | Location loc = this->location(); | |
5155 | ||
5156 | Expression* a1 = this->operand_address(inserter, this->left_); | |
5157 | Expression* a2 = this->operand_address(inserter, this->right_); | |
5158 | Expression* len = Expression::make_type_info(this->left_->type(), | |
5159 | TYPE_INFO_SIZE); | |
5160 | ||
5161 | Expression* call = Runtime::make_call(Runtime::MEMCMP, loc, 3, a1, a2, len); | |
e67508fa | 5162 | Expression* zero = Expression::make_integer_ul(0, NULL, loc); |
e9d3367e | 5163 | return Expression::make_binary(this->op_, call, zero, loc); |
5164 | } | |
5165 | ||
a32698ee | 5166 | Expression* |
5c3f3470 | 5167 | Binary_expression::do_flatten(Gogo* gogo, Named_object*, |
a32698ee | 5168 | Statement_inserter* inserter) |
5169 | { | |
5170 | Location loc = this->location(); | |
5bf8be8b | 5171 | if (this->left_->type()->is_error_type() |
5172 | || this->right_->type()->is_error_type() | |
5173 | || this->left_->is_error_expression() | |
5174 | || this->right_->is_error_expression()) | |
5175 | { | |
5176 | go_assert(saw_errors()); | |
5177 | return Expression::make_error(loc); | |
5178 | } | |
5179 | ||
a32698ee | 5180 | Temporary_statement* temp; |
5181 | if (this->left_->type()->is_string_type() | |
5182 | && this->op_ == OPERATOR_PLUS) | |
5183 | { | |
0108f7b4 | 5184 | if (!this->left_->is_variable() |
5185 | && !this->left_->is_constant()) | |
a32698ee | 5186 | { |
5187 | temp = Statement::make_temporary(NULL, this->left_, loc); | |
5188 | inserter->insert(temp); | |
5189 | this->left_ = Expression::make_temporary_reference(temp, loc); | |
5190 | } | |
0108f7b4 | 5191 | if (!this->right_->is_variable() |
5192 | && !this->right_->is_constant()) | |
a32698ee | 5193 | { |
5194 | temp = | |
5195 | Statement::make_temporary(this->left_->type(), this->right_, loc); | |
5196 | this->right_ = Expression::make_temporary_reference(temp, loc); | |
5197 | inserter->insert(temp); | |
5198 | } | |
5199 | } | |
5200 | ||
5201 | Type* left_type = this->left_->type(); | |
5202 | bool is_shift_op = (this->op_ == OPERATOR_LSHIFT | |
5203 | || this->op_ == OPERATOR_RSHIFT); | |
5204 | bool is_idiv_op = ((this->op_ == OPERATOR_DIV && | |
5205 | left_type->integer_type() != NULL) | |
5206 | || this->op_ == OPERATOR_MOD); | |
5207 | ||
a32698ee | 5208 | if (is_shift_op |
5c3f3470 | 5209 | || (is_idiv_op |
5210 | && (gogo->check_divide_by_zero() || gogo->check_divide_overflow()))) | |
a32698ee | 5211 | { |
545ab43b | 5212 | if (!this->left_->is_variable() && !this->left_->is_constant()) |
a32698ee | 5213 | { |
5214 | temp = Statement::make_temporary(NULL, this->left_, loc); | |
5215 | inserter->insert(temp); | |
5216 | this->left_ = Expression::make_temporary_reference(temp, loc); | |
5217 | } | |
545ab43b | 5218 | if (!this->right_->is_variable() && !this->right_->is_constant()) |
a32698ee | 5219 | { |
5220 | temp = | |
5221 | Statement::make_temporary(NULL, this->right_, loc); | |
5222 | this->right_ = Expression::make_temporary_reference(temp, loc); | |
5223 | inserter->insert(temp); | |
5224 | } | |
5225 | } | |
5226 | return this; | |
5227 | } | |
5228 | ||
5229 | ||
e9d3367e | 5230 | // Return the address of EXPR, cast to unsafe.Pointer. |
5231 | ||
5232 | Expression* | |
5233 | Binary_expression::operand_address(Statement_inserter* inserter, | |
5234 | Expression* expr) | |
5235 | { | |
5236 | Location loc = this->location(); | |
5237 | ||
5238 | if (!expr->is_addressable()) | |
5239 | { | |
5240 | Temporary_statement* temp = Statement::make_temporary(expr->type(), NULL, | |
5241 | loc); | |
5242 | inserter->insert(temp); | |
5243 | expr = Expression::make_set_and_use_temporary(temp, expr, loc); | |
5244 | } | |
5245 | expr = Expression::make_unary(OPERATOR_AND, expr, loc); | |
5246 | static_cast<Unary_expression*>(expr)->set_does_not_escape(); | |
5247 | Type* void_type = Type::make_void_type(); | |
5248 | Type* unsafe_pointer_type = Type::make_pointer_type(void_type); | |
5249 | return Expression::make_cast(unsafe_pointer_type, expr, loc); | |
5250 | } | |
5251 | ||
0c77715b | 5252 | // Return the numeric constant value, if it has one. |
e440a328 | 5253 | |
5254 | bool | |
0c77715b | 5255 | Binary_expression::do_numeric_constant_value(Numeric_constant* nc) const |
e440a328 | 5256 | { |
0c77715b | 5257 | Numeric_constant left_nc; |
5258 | if (!this->left_->numeric_constant_value(&left_nc)) | |
5259 | return false; | |
5260 | Numeric_constant right_nc; | |
5261 | if (!this->right_->numeric_constant_value(&right_nc)) | |
5262 | return false; | |
9767e2d3 | 5263 | return Binary_expression::eval_constant(this->op_, &left_nc, &right_nc, |
0c77715b | 5264 | this->location(), nc); |
e440a328 | 5265 | } |
5266 | ||
5267 | // Note that the value is being discarded. | |
5268 | ||
4f2138d7 | 5269 | bool |
e440a328 | 5270 | Binary_expression::do_discarding_value() |
5271 | { | |
5272 | if (this->op_ == OPERATOR_OROR || this->op_ == OPERATOR_ANDAND) | |
4f2138d7 | 5273 | return this->right_->discarding_value(); |
e440a328 | 5274 | else |
4f2138d7 | 5275 | { |
5276 | this->unused_value_error(); | |
5277 | return false; | |
5278 | } | |
e440a328 | 5279 | } |
5280 | ||
5281 | // Get type. | |
5282 | ||
5283 | Type* | |
5284 | Binary_expression::do_type() | |
5285 | { | |
5f5fea79 | 5286 | if (this->classification() == EXPRESSION_ERROR) |
5287 | return Type::make_error_type(); | |
5288 | ||
e440a328 | 5289 | switch (this->op_) |
5290 | { | |
e440a328 | 5291 | case OPERATOR_EQEQ: |
5292 | case OPERATOR_NOTEQ: | |
5293 | case OPERATOR_LT: | |
5294 | case OPERATOR_LE: | |
5295 | case OPERATOR_GT: | |
5296 | case OPERATOR_GE: | |
e90c9dfc | 5297 | if (this->type_ == NULL) |
5298 | this->type_ = Type::make_boolean_type(); | |
5299 | return this->type_; | |
e440a328 | 5300 | |
5301 | case OPERATOR_PLUS: | |
5302 | case OPERATOR_MINUS: | |
5303 | case OPERATOR_OR: | |
5304 | case OPERATOR_XOR: | |
5305 | case OPERATOR_MULT: | |
5306 | case OPERATOR_DIV: | |
5307 | case OPERATOR_MOD: | |
5308 | case OPERATOR_AND: | |
5309 | case OPERATOR_BITCLEAR: | |
e90c9dfc | 5310 | case OPERATOR_OROR: |
5311 | case OPERATOR_ANDAND: | |
e440a328 | 5312 | { |
0c77715b | 5313 | Type* type; |
5314 | if (!Binary_expression::operation_type(this->op_, | |
5315 | this->left_->type(), | |
5316 | this->right_->type(), | |
5317 | &type)) | |
5318 | return Type::make_error_type(); | |
5319 | return type; | |
e440a328 | 5320 | } |
5321 | ||
5322 | case OPERATOR_LSHIFT: | |
5323 | case OPERATOR_RSHIFT: | |
5324 | return this->left_->type(); | |
5325 | ||
5326 | default: | |
c3e6f413 | 5327 | go_unreachable(); |
e440a328 | 5328 | } |
5329 | } | |
5330 | ||
5331 | // Set type for a binary expression. | |
5332 | ||
5333 | void | |
5334 | Binary_expression::do_determine_type(const Type_context* context) | |
5335 | { | |
5336 | Type* tleft = this->left_->type(); | |
5337 | Type* tright = this->right_->type(); | |
5338 | ||
5339 | // Both sides should have the same type, except for the shift | |
5340 | // operations. For a comparison, we should ignore the incoming | |
5341 | // type. | |
5342 | ||
5343 | bool is_shift_op = (this->op_ == OPERATOR_LSHIFT | |
5344 | || this->op_ == OPERATOR_RSHIFT); | |
5345 | ||
5346 | bool is_comparison = (this->op_ == OPERATOR_EQEQ | |
5347 | || this->op_ == OPERATOR_NOTEQ | |
5348 | || this->op_ == OPERATOR_LT | |
5349 | || this->op_ == OPERATOR_LE | |
5350 | || this->op_ == OPERATOR_GT | |
5351 | || this->op_ == OPERATOR_GE); | |
5352 | ||
c999c2a7 | 5353 | // For constant expressions, the context of the result is not useful in |
5354 | // determining the types of the operands. It is only legal to use abstract | |
5355 | // boolean, numeric, and string constants as operands where it is legal to | |
5356 | // use non-abstract boolean, numeric, and string constants, respectively. | |
5357 | // Any issues with the operation will be resolved in the check_types pass. | |
5358 | bool is_constant_expr = (this->left_->is_constant() | |
5359 | && this->right_->is_constant()); | |
5360 | ||
e440a328 | 5361 | Type_context subcontext(*context); |
5362 | ||
5363 | if (is_comparison) | |
5364 | { | |
5365 | // In a comparison, the context does not determine the types of | |
5366 | // the operands. | |
5367 | subcontext.type = NULL; | |
5368 | } | |
5369 | ||
5370 | // Set the context for the left hand operand. | |
5371 | if (is_shift_op) | |
5372 | { | |
b40dc774 | 5373 | // The right hand operand of a shift plays no role in |
5374 | // determining the type of the left hand operand. | |
e440a328 | 5375 | } |
5376 | else if (!tleft->is_abstract()) | |
5377 | subcontext.type = tleft; | |
5378 | else if (!tright->is_abstract()) | |
5379 | subcontext.type = tright; | |
5380 | else if (subcontext.type == NULL) | |
5381 | { | |
5382 | if ((tleft->integer_type() != NULL && tright->integer_type() != NULL) | |
5383 | || (tleft->float_type() != NULL && tright->float_type() != NULL) | |
5384 | || (tleft->complex_type() != NULL && tright->complex_type() != NULL)) | |
5385 | { | |
5386 | // Both sides have an abstract integer, abstract float, or | |
5387 | // abstract complex type. Just let CONTEXT determine | |
5388 | // whether they may remain abstract or not. | |
5389 | } | |
5390 | else if (tleft->complex_type() != NULL) | |
5391 | subcontext.type = tleft; | |
5392 | else if (tright->complex_type() != NULL) | |
5393 | subcontext.type = tright; | |
5394 | else if (tleft->float_type() != NULL) | |
5395 | subcontext.type = tleft; | |
5396 | else if (tright->float_type() != NULL) | |
5397 | subcontext.type = tright; | |
5398 | else | |
5399 | subcontext.type = tleft; | |
f58a23ae | 5400 | |
5401 | if (subcontext.type != NULL && !context->may_be_abstract) | |
5402 | subcontext.type = subcontext.type->make_non_abstract_type(); | |
e440a328 | 5403 | } |
5404 | ||
c999c2a7 | 5405 | if (!is_constant_expr) |
5406 | this->left_->determine_type(&subcontext); | |
e440a328 | 5407 | |
e440a328 | 5408 | if (is_shift_op) |
5409 | { | |
b40dc774 | 5410 | // We may have inherited an unusable type for the shift operand. |
5411 | // Give a useful error if that happened. | |
5412 | if (tleft->is_abstract() | |
5413 | && subcontext.type != NULL | |
8ab6effb | 5414 | && !subcontext.may_be_abstract |
f6bc81e6 | 5415 | && subcontext.type->interface_type() == NULL |
8ab6effb | 5416 | && subcontext.type->integer_type() == NULL) |
b40dc774 | 5417 | this->report_error(("invalid context-determined non-integer type " |
8ab6effb | 5418 | "for left operand of shift")); |
b40dc774 | 5419 | |
5420 | // The context for the right hand operand is the same as for the | |
5421 | // left hand operand, except for a shift operator. | |
e440a328 | 5422 | subcontext.type = Type::lookup_integer_type("uint"); |
5423 | subcontext.may_be_abstract = false; | |
5424 | } | |
5425 | ||
c999c2a7 | 5426 | if (!is_constant_expr) |
5427 | this->right_->determine_type(&subcontext); | |
e90c9dfc | 5428 | |
5429 | if (is_comparison) | |
5430 | { | |
5431 | if (this->type_ != NULL && !this->type_->is_abstract()) | |
5432 | ; | |
5433 | else if (context->type != NULL && context->type->is_boolean_type()) | |
5434 | this->type_ = context->type; | |
5435 | else if (!context->may_be_abstract) | |
5436 | this->type_ = Type::lookup_bool_type(); | |
5437 | } | |
e440a328 | 5438 | } |
5439 | ||
5440 | // Report an error if the binary operator OP does not support TYPE. | |
be8b5eee | 5441 | // OTYPE is the type of the other operand. Return whether the |
5442 | // operation is OK. This should not be used for shift. | |
e440a328 | 5443 | |
5444 | bool | |
be8b5eee | 5445 | Binary_expression::check_operator_type(Operator op, Type* type, Type* otype, |
b13c66cd | 5446 | Location location) |
e440a328 | 5447 | { |
5448 | switch (op) | |
5449 | { | |
5450 | case OPERATOR_OROR: | |
5451 | case OPERATOR_ANDAND: | |
c999c2a7 | 5452 | if (!type->is_boolean_type() |
5453 | || !otype->is_boolean_type()) | |
e440a328 | 5454 | { |
5455 | error_at(location, "expected boolean type"); | |
5456 | return false; | |
5457 | } | |
5458 | break; | |
5459 | ||
5460 | case OPERATOR_EQEQ: | |
5461 | case OPERATOR_NOTEQ: | |
e9d3367e | 5462 | { |
5463 | std::string reason; | |
5464 | if (!Type::are_compatible_for_comparison(true, type, otype, &reason)) | |
5465 | { | |
5466 | error_at(location, "%s", reason.c_str()); | |
5467 | return false; | |
5468 | } | |
5469 | } | |
e440a328 | 5470 | break; |
5471 | ||
5472 | case OPERATOR_LT: | |
5473 | case OPERATOR_LE: | |
5474 | case OPERATOR_GT: | |
5475 | case OPERATOR_GE: | |
e9d3367e | 5476 | { |
5477 | std::string reason; | |
5478 | if (!Type::are_compatible_for_comparison(false, type, otype, &reason)) | |
5479 | { | |
5480 | error_at(location, "%s", reason.c_str()); | |
5481 | return false; | |
5482 | } | |
5483 | } | |
e440a328 | 5484 | break; |
5485 | ||
5486 | case OPERATOR_PLUS: | |
5487 | case OPERATOR_PLUSEQ: | |
c999c2a7 | 5488 | if ((!type->is_numeric_type() && !type->is_string_type()) |
5489 | || (!otype->is_numeric_type() && !otype->is_string_type())) | |
e440a328 | 5490 | { |
5491 | error_at(location, | |
5492 | "expected integer, floating, complex, or string type"); | |
5493 | return false; | |
5494 | } | |
5495 | break; | |
5496 | ||
5497 | case OPERATOR_MINUS: | |
5498 | case OPERATOR_MINUSEQ: | |
5499 | case OPERATOR_MULT: | |
5500 | case OPERATOR_MULTEQ: | |
5501 | case OPERATOR_DIV: | |
5502 | case OPERATOR_DIVEQ: | |
c999c2a7 | 5503 | if (!type->is_numeric_type() || !otype->is_numeric_type()) |
e440a328 | 5504 | { |
5505 | error_at(location, "expected integer, floating, or complex type"); | |
5506 | return false; | |
5507 | } | |
5508 | break; | |
5509 | ||
5510 | case OPERATOR_MOD: | |
5511 | case OPERATOR_MODEQ: | |
5512 | case OPERATOR_OR: | |
5513 | case OPERATOR_OREQ: | |
5514 | case OPERATOR_AND: | |
5515 | case OPERATOR_ANDEQ: | |
5516 | case OPERATOR_XOR: | |
5517 | case OPERATOR_XOREQ: | |
5518 | case OPERATOR_BITCLEAR: | |
5519 | case OPERATOR_BITCLEAREQ: | |
c999c2a7 | 5520 | if (type->integer_type() == NULL || otype->integer_type() == NULL) |
e440a328 | 5521 | { |
5522 | error_at(location, "expected integer type"); | |
5523 | return false; | |
5524 | } | |
5525 | break; | |
5526 | ||
5527 | default: | |
c3e6f413 | 5528 | go_unreachable(); |
e440a328 | 5529 | } |
5530 | ||
5531 | return true; | |
5532 | } | |
5533 | ||
5534 | // Check types. | |
5535 | ||
5536 | void | |
5537 | Binary_expression::do_check_types(Gogo*) | |
5538 | { | |
5f5fea79 | 5539 | if (this->classification() == EXPRESSION_ERROR) |
5540 | return; | |
5541 | ||
e440a328 | 5542 | Type* left_type = this->left_->type(); |
5543 | Type* right_type = this->right_->type(); | |
5c13bd80 | 5544 | if (left_type->is_error() || right_type->is_error()) |
9fe897ef | 5545 | { |
5546 | this->set_is_error(); | |
5547 | return; | |
5548 | } | |
e440a328 | 5549 | |
5550 | if (this->op_ == OPERATOR_EQEQ | |
5551 | || this->op_ == OPERATOR_NOTEQ | |
5552 | || this->op_ == OPERATOR_LT | |
5553 | || this->op_ == OPERATOR_LE | |
5554 | || this->op_ == OPERATOR_GT | |
5555 | || this->op_ == OPERATOR_GE) | |
5556 | { | |
907c5ecd | 5557 | if (left_type->is_nil_type() && right_type->is_nil_type()) |
5558 | { | |
5559 | this->report_error(_("invalid comparison of nil with nil")); | |
5560 | return; | |
5561 | } | |
e440a328 | 5562 | if (!Type::are_assignable(left_type, right_type, NULL) |
5563 | && !Type::are_assignable(right_type, left_type, NULL)) | |
5564 | { | |
5565 | this->report_error(_("incompatible types in binary expression")); | |
5566 | return; | |
5567 | } | |
5568 | if (!Binary_expression::check_operator_type(this->op_, left_type, | |
be8b5eee | 5569 | right_type, |
e440a328 | 5570 | this->location()) |
5571 | || !Binary_expression::check_operator_type(this->op_, right_type, | |
be8b5eee | 5572 | left_type, |
e440a328 | 5573 | this->location())) |
5574 | { | |
5575 | this->set_is_error(); | |
5576 | return; | |
5577 | } | |
5578 | } | |
5579 | else if (this->op_ != OPERATOR_LSHIFT && this->op_ != OPERATOR_RSHIFT) | |
5580 | { | |
5581 | if (!Type::are_compatible_for_binop(left_type, right_type)) | |
5582 | { | |
5583 | this->report_error(_("incompatible types in binary expression")); | |
5584 | return; | |
5585 | } | |
5586 | if (!Binary_expression::check_operator_type(this->op_, left_type, | |
be8b5eee | 5587 | right_type, |
e440a328 | 5588 | this->location())) |
5589 | { | |
5590 | this->set_is_error(); | |
5591 | return; | |
5592 | } | |
5c65b19d | 5593 | if (this->op_ == OPERATOR_DIV || this->op_ == OPERATOR_MOD) |
5594 | { | |
5595 | // Division by a zero integer constant is an error. | |
5596 | Numeric_constant rconst; | |
5597 | unsigned long rval; | |
5598 | if (left_type->integer_type() != NULL | |
5599 | && this->right_->numeric_constant_value(&rconst) | |
5600 | && rconst.to_unsigned_long(&rval) == Numeric_constant::NC_UL_VALID | |
5601 | && rval == 0) | |
5602 | { | |
5603 | this->report_error(_("integer division by zero")); | |
5604 | return; | |
5605 | } | |
5606 | } | |
e440a328 | 5607 | } |
5608 | else | |
5609 | { | |
5610 | if (left_type->integer_type() == NULL) | |
5611 | this->report_error(_("shift of non-integer operand")); | |
5612 | ||
6b5e0fac | 5613 | if (right_type->is_string_type()) |
5614 | this->report_error(_("shift count not unsigned integer")); | |
5615 | else if (!right_type->is_abstract() | |
e440a328 | 5616 | && (right_type->integer_type() == NULL |
5617 | || !right_type->integer_type()->is_unsigned())) | |
5618 | this->report_error(_("shift count not unsigned integer")); | |
5619 | else | |
5620 | { | |
0c77715b | 5621 | Numeric_constant nc; |
5622 | if (this->right_->numeric_constant_value(&nc)) | |
e440a328 | 5623 | { |
0c77715b | 5624 | mpz_t val; |
5625 | if (!nc.to_int(&val)) | |
5626 | this->report_error(_("shift count not unsigned integer")); | |
5627 | else | |
a4eba91b | 5628 | { |
0c77715b | 5629 | if (mpz_sgn(val) < 0) |
5630 | { | |
5631 | this->report_error(_("negative shift count")); | |
0c77715b | 5632 | Location rloc = this->right_->location(); |
e67508fa | 5633 | this->right_ = Expression::make_integer_ul(0, right_type, |
5634 | rloc); | |
0c77715b | 5635 | } |
5636 | mpz_clear(val); | |
a4eba91b | 5637 | } |
e440a328 | 5638 | } |
e440a328 | 5639 | } |
5640 | } | |
5641 | } | |
5642 | ||
ea664253 | 5643 | // Get the backend representation for a binary expression. |
e440a328 | 5644 | |
ea664253 | 5645 | Bexpression* |
5646 | Binary_expression::do_get_backend(Translate_context* context) | |
e440a328 | 5647 | { |
1b1f2abf | 5648 | Gogo* gogo = context->gogo(); |
a32698ee | 5649 | Location loc = this->location(); |
5650 | Type* left_type = this->left_->type(); | |
5651 | Type* right_type = this->right_->type(); | |
1b1f2abf | 5652 | |
e440a328 | 5653 | bool use_left_type = true; |
5654 | bool is_shift_op = false; | |
29a2d1d8 | 5655 | bool is_idiv_op = false; |
e440a328 | 5656 | switch (this->op_) |
5657 | { | |
5658 | case OPERATOR_EQEQ: | |
5659 | case OPERATOR_NOTEQ: | |
5660 | case OPERATOR_LT: | |
5661 | case OPERATOR_LE: | |
5662 | case OPERATOR_GT: | |
5663 | case OPERATOR_GE: | |
ea664253 | 5664 | return Expression::comparison(context, this->type_, this->op_, |
5665 | this->left_, this->right_, loc); | |
e440a328 | 5666 | |
5667 | case OPERATOR_OROR: | |
e440a328 | 5668 | case OPERATOR_ANDAND: |
e440a328 | 5669 | use_left_type = false; |
5670 | break; | |
5671 | case OPERATOR_PLUS: | |
e440a328 | 5672 | case OPERATOR_MINUS: |
e440a328 | 5673 | case OPERATOR_OR: |
e440a328 | 5674 | case OPERATOR_XOR: |
e440a328 | 5675 | case OPERATOR_MULT: |
e440a328 | 5676 | break; |
5677 | case OPERATOR_DIV: | |
a32698ee | 5678 | if (left_type->float_type() != NULL || left_type->complex_type() != NULL) |
5679 | break; | |
e440a328 | 5680 | case OPERATOR_MOD: |
29a2d1d8 | 5681 | is_idiv_op = true; |
e440a328 | 5682 | break; |
5683 | case OPERATOR_LSHIFT: | |
e440a328 | 5684 | case OPERATOR_RSHIFT: |
e440a328 | 5685 | is_shift_op = true; |
5686 | break; | |
e440a328 | 5687 | case OPERATOR_BITCLEAR: |
a32698ee | 5688 | this->right_ = Expression::make_unary(OPERATOR_XOR, this->right_, loc); |
5689 | case OPERATOR_AND: | |
e440a328 | 5690 | break; |
5691 | default: | |
c3e6f413 | 5692 | go_unreachable(); |
e440a328 | 5693 | } |
5694 | ||
a32698ee | 5695 | if (left_type->is_string_type()) |
e440a328 | 5696 | { |
c484d925 | 5697 | go_assert(this->op_ == OPERATOR_PLUS); |
a32698ee | 5698 | Expression* string_plus = |
5699 | Runtime::make_call(Runtime::STRING_PLUS, loc, 2, | |
5700 | this->left_, this->right_); | |
ea664253 | 5701 | return string_plus->get_backend(context); |
a32698ee | 5702 | } |
5703 | ||
5704 | // For complex division Go might want slightly different results than the | |
5705 | // backend implementation provides, so we have our own runtime routine. | |
1850e20c | 5706 | if (this->op_ == OPERATOR_DIV && this->left_->type()->complex_type() != NULL) |
5707 | { | |
a32698ee | 5708 | Runtime::Function complex_code; |
1850e20c | 5709 | switch (this->left_->type()->complex_type()->bits()) |
5710 | { | |
5711 | case 64: | |
a32698ee | 5712 | complex_code = Runtime::COMPLEX64_DIV; |
1850e20c | 5713 | break; |
5714 | case 128: | |
a32698ee | 5715 | complex_code = Runtime::COMPLEX128_DIV; |
1850e20c | 5716 | break; |
5717 | default: | |
5718 | go_unreachable(); | |
5719 | } | |
a32698ee | 5720 | Expression* complex_div = |
5721 | Runtime::make_call(complex_code, loc, 2, this->left_, this->right_); | |
ea664253 | 5722 | return complex_div->get_backend(context); |
1850e20c | 5723 | } |
5724 | ||
ea664253 | 5725 | Bexpression* left = this->left_->get_backend(context); |
5726 | Bexpression* right = this->right_->get_backend(context); | |
e440a328 | 5727 | |
a32698ee | 5728 | Type* type = use_left_type ? left_type : right_type; |
5729 | Btype* btype = type->get_backend(gogo); | |
5730 | ||
5731 | Bexpression* ret = | |
5732 | gogo->backend()->binary_expression(this->op_, left, right, loc); | |
5733 | ret = gogo->backend()->convert_expression(btype, ret, loc); | |
e440a328 | 5734 | |
a32698ee | 5735 | // Initialize overflow constants. |
5736 | Bexpression* overflow; | |
5737 | mpz_t zero; | |
5738 | mpz_init_set_ui(zero, 0UL); | |
5739 | mpz_t one; | |
5740 | mpz_init_set_ui(one, 1UL); | |
5741 | mpz_t neg_one; | |
5742 | mpz_init_set_si(neg_one, -1); | |
e440a328 | 5743 | |
a32698ee | 5744 | Btype* left_btype = left_type->get_backend(gogo); |
5745 | Btype* right_btype = right_type->get_backend(gogo); | |
e440a328 | 5746 | |
5747 | // In Go, a shift larger than the size of the type is well-defined. | |
a32698ee | 5748 | // This is not true in C, so we need to insert a conditional. |
e440a328 | 5749 | if (is_shift_op) |
5750 | { | |
a32698ee | 5751 | go_assert(left_type->integer_type() != NULL); |
e440a328 | 5752 | |
a32698ee | 5753 | mpz_t bitsval; |
5754 | int bits = left_type->integer_type()->bits(); | |
5755 | mpz_init_set_ui(bitsval, bits); | |
5756 | Bexpression* bits_expr = | |
5757 | gogo->backend()->integer_constant_expression(right_btype, bitsval); | |
5758 | Bexpression* compare = | |
5759 | gogo->backend()->binary_expression(OPERATOR_LT, | |
5760 | right, bits_expr, loc); | |
e440a328 | 5761 | |
a32698ee | 5762 | Bexpression* zero_expr = |
5763 | gogo->backend()->integer_constant_expression(left_btype, zero); | |
5764 | overflow = zero_expr; | |
e440a328 | 5765 | if (this->op_ == OPERATOR_RSHIFT |
a32698ee | 5766 | && !left_type->integer_type()->is_unsigned()) |
e440a328 | 5767 | { |
a32698ee | 5768 | Bexpression* neg_expr = |
5769 | gogo->backend()->binary_expression(OPERATOR_LT, left, | |
5770 | zero_expr, loc); | |
5771 | Bexpression* neg_one_expr = | |
5772 | gogo->backend()->integer_constant_expression(left_btype, neg_one); | |
5773 | overflow = gogo->backend()->conditional_expression(btype, neg_expr, | |
5774 | neg_one_expr, | |
5775 | zero_expr, loc); | |
29a2d1d8 | 5776 | } |
a32698ee | 5777 | ret = gogo->backend()->conditional_expression(btype, compare, ret, |
5778 | overflow, loc); | |
5779 | mpz_clear(bitsval); | |
29a2d1d8 | 5780 | } |
5781 | ||
5782 | // Add checks for division by zero and division overflow as needed. | |
5783 | if (is_idiv_op) | |
5784 | { | |
5c3f3470 | 5785 | if (gogo->check_divide_by_zero()) |
29a2d1d8 | 5786 | { |
5787 | // right == 0 | |
a32698ee | 5788 | Bexpression* zero_expr = |
5789 | gogo->backend()->integer_constant_expression(right_btype, zero); | |
5790 | Bexpression* check = | |
5791 | gogo->backend()->binary_expression(OPERATOR_EQEQ, | |
5792 | right, zero_expr, loc); | |
29a2d1d8 | 5793 | |
a32698ee | 5794 | // __go_runtime_error(RUNTIME_ERROR_DIVISION_BY_ZERO) |
29a2d1d8 | 5795 | int errcode = RUNTIME_ERROR_DIVISION_BY_ZERO; |
ea664253 | 5796 | Bexpression* crash = gogo->runtime_error(errcode, |
5797 | loc)->get_backend(context); | |
29a2d1d8 | 5798 | |
5799 | // right == 0 ? (__go_runtime_error(...), 0) : ret | |
ea664253 | 5800 | ret = gogo->backend()->conditional_expression(btype, check, crash, |
5801 | ret, loc); | |
b13c66cd | 5802 | } |
5803 | ||
5c3f3470 | 5804 | if (gogo->check_divide_overflow()) |
29a2d1d8 | 5805 | { |
5806 | // right == -1 | |
5807 | // FIXME: It would be nice to say that this test is expected | |
5808 | // to return false. | |
a32698ee | 5809 | |
5810 | Bexpression* neg_one_expr = | |
5811 | gogo->backend()->integer_constant_expression(right_btype, neg_one); | |
5812 | Bexpression* check = | |
5813 | gogo->backend()->binary_expression(OPERATOR_EQEQ, | |
5814 | right, neg_one_expr, loc); | |
5815 | ||
5816 | Bexpression* zero_expr = | |
5817 | gogo->backend()->integer_constant_expression(btype, zero); | |
5818 | Bexpression* one_expr = | |
5819 | gogo->backend()->integer_constant_expression(btype, one); | |
5820 | ||
5821 | if (type->integer_type()->is_unsigned()) | |
29a2d1d8 | 5822 | { |
5823 | // An unsigned -1 is the largest possible number, so | |
5824 | // dividing is always 1 or 0. | |
a32698ee | 5825 | |
5826 | Bexpression* cmp = | |
5827 | gogo->backend()->binary_expression(OPERATOR_EQEQ, | |
5828 | left, right, loc); | |
29a2d1d8 | 5829 | if (this->op_ == OPERATOR_DIV) |
a32698ee | 5830 | overflow = |
5831 | gogo->backend()->conditional_expression(btype, cmp, | |
5832 | one_expr, zero_expr, | |
5833 | loc); | |
29a2d1d8 | 5834 | else |
a32698ee | 5835 | overflow = |
5836 | gogo->backend()->conditional_expression(btype, cmp, | |
5837 | zero_expr, left, | |
5838 | loc); | |
29a2d1d8 | 5839 | } |
5840 | else | |
5841 | { | |
5842 | // Computing left / -1 is the same as computing - left, | |
5843 | // which does not overflow since Go sets -fwrapv. | |
5844 | if (this->op_ == OPERATOR_DIV) | |
a32698ee | 5845 | { |
5846 | Expression* negate_expr = | |
5847 | Expression::make_unary(OPERATOR_MINUS, this->left_, loc); | |
ea664253 | 5848 | overflow = negate_expr->get_backend(context); |
a32698ee | 5849 | } |
29a2d1d8 | 5850 | else |
a32698ee | 5851 | overflow = zero_expr; |
29a2d1d8 | 5852 | } |
a32698ee | 5853 | overflow = gogo->backend()->convert_expression(btype, overflow, loc); |
29a2d1d8 | 5854 | |
5855 | // right == -1 ? - left : ret | |
a32698ee | 5856 | ret = gogo->backend()->conditional_expression(btype, check, overflow, |
5857 | ret, loc); | |
29a2d1d8 | 5858 | } |
e440a328 | 5859 | } |
5860 | ||
a32698ee | 5861 | mpz_clear(zero); |
5862 | mpz_clear(one); | |
5863 | mpz_clear(neg_one); | |
ea664253 | 5864 | return ret; |
e440a328 | 5865 | } |
5866 | ||
5867 | // Export a binary expression. | |
5868 | ||
5869 | void | |
5870 | Binary_expression::do_export(Export* exp) const | |
5871 | { | |
5872 | exp->write_c_string("("); | |
5873 | this->left_->export_expression(exp); | |
5874 | switch (this->op_) | |
5875 | { | |
5876 | case OPERATOR_OROR: | |
5877 | exp->write_c_string(" || "); | |
5878 | break; | |
5879 | case OPERATOR_ANDAND: | |
5880 | exp->write_c_string(" && "); | |
5881 | break; | |
5882 | case OPERATOR_EQEQ: | |
5883 | exp->write_c_string(" == "); | |
5884 | break; | |
5885 | case OPERATOR_NOTEQ: | |
5886 | exp->write_c_string(" != "); | |
5887 | break; | |
5888 | case OPERATOR_LT: | |
5889 | exp->write_c_string(" < "); | |
5890 | break; | |
5891 | case OPERATOR_LE: | |
5892 | exp->write_c_string(" <= "); | |
5893 | break; | |
5894 | case OPERATOR_GT: | |
5895 | exp->write_c_string(" > "); | |
5896 | break; | |
5897 | case OPERATOR_GE: | |
5898 | exp->write_c_string(" >= "); | |
5899 | break; | |
5900 | case OPERATOR_PLUS: | |
5901 | exp->write_c_string(" + "); | |
5902 | break; | |
5903 | case OPERATOR_MINUS: | |
5904 | exp->write_c_string(" - "); | |
5905 | break; | |
5906 | case OPERATOR_OR: | |
5907 | exp->write_c_string(" | "); | |
5908 | break; | |
5909 | case OPERATOR_XOR: | |
5910 | exp->write_c_string(" ^ "); | |
5911 | break; | |
5912 | case OPERATOR_MULT: | |
5913 | exp->write_c_string(" * "); | |
5914 | break; | |
5915 | case OPERATOR_DIV: | |
5916 | exp->write_c_string(" / "); | |
5917 | break; | |
5918 | case OPERATOR_MOD: | |
5919 | exp->write_c_string(" % "); | |
5920 | break; | |
5921 | case OPERATOR_LSHIFT: | |
5922 | exp->write_c_string(" << "); | |
5923 | break; | |
5924 | case OPERATOR_RSHIFT: | |
5925 | exp->write_c_string(" >> "); | |
5926 | break; | |
5927 | case OPERATOR_AND: | |
5928 | exp->write_c_string(" & "); | |
5929 | break; | |
5930 | case OPERATOR_BITCLEAR: | |
5931 | exp->write_c_string(" &^ "); | |
5932 | break; | |
5933 | default: | |
c3e6f413 | 5934 | go_unreachable(); |
e440a328 | 5935 | } |
5936 | this->right_->export_expression(exp); | |
5937 | exp->write_c_string(")"); | |
5938 | } | |
5939 | ||
5940 | // Import a binary expression. | |
5941 | ||
5942 | Expression* | |
5943 | Binary_expression::do_import(Import* imp) | |
5944 | { | |
5945 | imp->require_c_string("("); | |
5946 | ||
5947 | Expression* left = Expression::import_expression(imp); | |
5948 | ||
5949 | Operator op; | |
5950 | if (imp->match_c_string(" || ")) | |
5951 | { | |
5952 | op = OPERATOR_OROR; | |
5953 | imp->advance(4); | |
5954 | } | |
5955 | else if (imp->match_c_string(" && ")) | |
5956 | { | |
5957 | op = OPERATOR_ANDAND; | |
5958 | imp->advance(4); | |
5959 | } | |
5960 | else if (imp->match_c_string(" == ")) | |
5961 | { | |
5962 | op = OPERATOR_EQEQ; | |
5963 | imp->advance(4); | |
5964 | } | |
5965 | else if (imp->match_c_string(" != ")) | |
5966 | { | |
5967 | op = OPERATOR_NOTEQ; | |
5968 | imp->advance(4); | |
5969 | } | |
5970 | else if (imp->match_c_string(" < ")) | |
5971 | { | |
5972 | op = OPERATOR_LT; | |
5973 | imp->advance(3); | |
5974 | } | |
5975 | else if (imp->match_c_string(" <= ")) | |
5976 | { | |
5977 | op = OPERATOR_LE; | |
5978 | imp->advance(4); | |
5979 | } | |
5980 | else if (imp->match_c_string(" > ")) | |
5981 | { | |
5982 | op = OPERATOR_GT; | |
5983 | imp->advance(3); | |
5984 | } | |
5985 | else if (imp->match_c_string(" >= ")) | |
5986 | { | |
5987 | op = OPERATOR_GE; | |
5988 | imp->advance(4); | |
5989 | } | |
5990 | else if (imp->match_c_string(" + ")) | |
5991 | { | |
5992 | op = OPERATOR_PLUS; | |
5993 | imp->advance(3); | |
5994 | } | |
5995 | else if (imp->match_c_string(" - ")) | |
5996 | { | |
5997 | op = OPERATOR_MINUS; | |
5998 | imp->advance(3); | |
5999 | } | |
6000 | else if (imp->match_c_string(" | ")) | |
6001 | { | |
6002 | op = OPERATOR_OR; | |
6003 | imp->advance(3); | |
6004 | } | |
6005 | else if (imp->match_c_string(" ^ ")) | |
6006 | { | |
6007 | op = OPERATOR_XOR; | |
6008 | imp->advance(3); | |
6009 | } | |
6010 | else if (imp->match_c_string(" * ")) | |
6011 | { | |
6012 | op = OPERATOR_MULT; | |
6013 | imp->advance(3); | |
6014 | } | |
6015 | else if (imp->match_c_string(" / ")) | |
6016 | { | |
6017 | op = OPERATOR_DIV; | |
6018 | imp->advance(3); | |
6019 | } | |
6020 | else if (imp->match_c_string(" % ")) | |
6021 | { | |
6022 | op = OPERATOR_MOD; | |
6023 | imp->advance(3); | |
6024 | } | |
6025 | else if (imp->match_c_string(" << ")) | |
6026 | { | |
6027 | op = OPERATOR_LSHIFT; | |
6028 | imp->advance(4); | |
6029 | } | |
6030 | else if (imp->match_c_string(" >> ")) | |
6031 | { | |
6032 | op = OPERATOR_RSHIFT; | |
6033 | imp->advance(4); | |
6034 | } | |
6035 | else if (imp->match_c_string(" & ")) | |
6036 | { | |
6037 | op = OPERATOR_AND; | |
6038 | imp->advance(3); | |
6039 | } | |
6040 | else if (imp->match_c_string(" &^ ")) | |
6041 | { | |
6042 | op = OPERATOR_BITCLEAR; | |
6043 | imp->advance(4); | |
6044 | } | |
6045 | else | |
6046 | { | |
6047 | error_at(imp->location(), "unrecognized binary operator"); | |
6048 | return Expression::make_error(imp->location()); | |
6049 | } | |
6050 | ||
6051 | Expression* right = Expression::import_expression(imp); | |
6052 | ||
6053 | imp->require_c_string(")"); | |
6054 | ||
6055 | return Expression::make_binary(op, left, right, imp->location()); | |
6056 | } | |
6057 | ||
d751bb78 | 6058 | // Dump ast representation of a binary expression. |
6059 | ||
6060 | void | |
6061 | Binary_expression::do_dump_expression(Ast_dump_context* ast_dump_context) const | |
6062 | { | |
6063 | ast_dump_context->ostream() << "("; | |
6064 | ast_dump_context->dump_expression(this->left_); | |
6065 | ast_dump_context->ostream() << " "; | |
6066 | ast_dump_context->dump_operator(this->op_); | |
6067 | ast_dump_context->ostream() << " "; | |
6068 | ast_dump_context->dump_expression(this->right_); | |
6069 | ast_dump_context->ostream() << ") "; | |
6070 | } | |
6071 | ||
e440a328 | 6072 | // Make a binary expression. |
6073 | ||
6074 | Expression* | |
6075 | Expression::make_binary(Operator op, Expression* left, Expression* right, | |
b13c66cd | 6076 | Location location) |
e440a328 | 6077 | { |
6078 | return new Binary_expression(op, left, right, location); | |
6079 | } | |
6080 | ||
6081 | // Implement a comparison. | |
6082 | ||
a32698ee | 6083 | Bexpression* |
6084 | Expression::comparison(Translate_context* context, Type* result_type, | |
6085 | Operator op, Expression* left, Expression* right, | |
6086 | Location location) | |
e440a328 | 6087 | { |
2387f644 | 6088 | Type* left_type = left->type(); |
6089 | Type* right_type = right->type(); | |
ceeb12d7 | 6090 | |
e67508fa | 6091 | Expression* zexpr = Expression::make_integer_ul(0, NULL, location); |
1b1f2abf | 6092 | |
15c67ee2 | 6093 | if (left_type->is_string_type() && right_type->is_string_type()) |
e440a328 | 6094 | { |
2387f644 | 6095 | left = Runtime::make_call(Runtime::STRCMP, location, 2, |
6096 | left, right); | |
6097 | right = zexpr; | |
e440a328 | 6098 | } |
15c67ee2 | 6099 | else if ((left_type->interface_type() != NULL |
6100 | && right_type->interface_type() == NULL | |
6101 | && !right_type->is_nil_type()) | |
6102 | || (left_type->interface_type() == NULL | |
6103 | && !left_type->is_nil_type() | |
6104 | && right_type->interface_type() != NULL)) | |
e440a328 | 6105 | { |
6106 | // Comparing an interface value to a non-interface value. | |
6107 | if (left_type->interface_type() == NULL) | |
6108 | { | |
6109 | std::swap(left_type, right_type); | |
2387f644 | 6110 | std::swap(left, right); |
e440a328 | 6111 | } |
6112 | ||
6113 | // The right operand is not an interface. We need to take its | |
6114 | // address if it is not a pointer. | |
ceeb12d7 | 6115 | Expression* pointer_arg = NULL; |
e440a328 | 6116 | if (right_type->points_to() != NULL) |
2387f644 | 6117 | pointer_arg = right; |
e440a328 | 6118 | else |
6119 | { | |
2387f644 | 6120 | go_assert(right->is_addressable()); |
6121 | pointer_arg = Expression::make_unary(OPERATOR_AND, right, | |
ceeb12d7 | 6122 | location); |
e440a328 | 6123 | } |
e440a328 | 6124 | |
2387f644 | 6125 | Expression* descriptor = |
6126 | Expression::make_type_descriptor(right_type, location); | |
6127 | left = | |
ceeb12d7 | 6128 | Runtime::make_call((left_type->interface_type()->is_empty() |
6129 | ? Runtime::EMPTY_INTERFACE_VALUE_COMPARE | |
6130 | : Runtime::INTERFACE_VALUE_COMPARE), | |
2387f644 | 6131 | location, 3, left, descriptor, |
ceeb12d7 | 6132 | pointer_arg); |
2387f644 | 6133 | right = zexpr; |
e440a328 | 6134 | } |
6135 | else if (left_type->interface_type() != NULL | |
6136 | && right_type->interface_type() != NULL) | |
6137 | { | |
ceeb12d7 | 6138 | Runtime::Function compare_function; |
739bad04 | 6139 | if (left_type->interface_type()->is_empty() |
6140 | && right_type->interface_type()->is_empty()) | |
ceeb12d7 | 6141 | compare_function = Runtime::EMPTY_INTERFACE_COMPARE; |
739bad04 | 6142 | else if (!left_type->interface_type()->is_empty() |
6143 | && !right_type->interface_type()->is_empty()) | |
ceeb12d7 | 6144 | compare_function = Runtime::INTERFACE_COMPARE; |
739bad04 | 6145 | else |
6146 | { | |
6147 | if (left_type->interface_type()->is_empty()) | |
6148 | { | |
c484d925 | 6149 | go_assert(op == OPERATOR_EQEQ || op == OPERATOR_NOTEQ); |
739bad04 | 6150 | std::swap(left_type, right_type); |
2387f644 | 6151 | std::swap(left, right); |
739bad04 | 6152 | } |
c484d925 | 6153 | go_assert(!left_type->interface_type()->is_empty()); |
6154 | go_assert(right_type->interface_type()->is_empty()); | |
ceeb12d7 | 6155 | compare_function = Runtime::INTERFACE_EMPTY_COMPARE; |
739bad04 | 6156 | } |
6157 | ||
2387f644 | 6158 | left = Runtime::make_call(compare_function, location, 2, left, right); |
6159 | right = zexpr; | |
e440a328 | 6160 | } |
6161 | ||
6162 | if (left_type->is_nil_type() | |
6163 | && (op == OPERATOR_EQEQ || op == OPERATOR_NOTEQ)) | |
6164 | { | |
6165 | std::swap(left_type, right_type); | |
2387f644 | 6166 | std::swap(left, right); |
e440a328 | 6167 | } |
6168 | ||
6169 | if (right_type->is_nil_type()) | |
6170 | { | |
2387f644 | 6171 | right = Expression::make_nil(location); |
e440a328 | 6172 | if (left_type->array_type() != NULL |
6173 | && left_type->array_type()->length() == NULL) | |
6174 | { | |
6175 | Array_type* at = left_type->array_type(); | |
2387f644 | 6176 | left = at->get_value_pointer(context->gogo(), left); |
e440a328 | 6177 | } |
6178 | else if (left_type->interface_type() != NULL) | |
6179 | { | |
6180 | // An interface is nil if the first field is nil. | |
2387f644 | 6181 | left = Expression::make_field_reference(left, 0, location); |
e440a328 | 6182 | } |
6183 | } | |
6184 | ||
ea664253 | 6185 | Bexpression* left_bexpr = left->get_backend(context); |
6186 | Bexpression* right_bexpr = right->get_backend(context); | |
e90c9dfc | 6187 | |
a32698ee | 6188 | Gogo* gogo = context->gogo(); |
6189 | Bexpression* ret = gogo->backend()->binary_expression(op, left_bexpr, | |
6190 | right_bexpr, location); | |
6191 | if (result_type != NULL) | |
6192 | ret = gogo->backend()->convert_expression(result_type->get_backend(gogo), | |
6193 | ret, location); | |
e440a328 | 6194 | return ret; |
6195 | } | |
6196 | ||
6197 | // Class Bound_method_expression. | |
6198 | ||
6199 | // Traversal. | |
6200 | ||
6201 | int | |
6202 | Bound_method_expression::do_traverse(Traverse* traverse) | |
6203 | { | |
e0659c9e | 6204 | return Expression::traverse(&this->expr_, traverse); |
e440a328 | 6205 | } |
6206 | ||
0afbb937 | 6207 | // Lower the expression. If this is a method value rather than being |
6208 | // called, and the method is accessed via a pointer, we may need to | |
6209 | // add nil checks. Introduce a temporary variable so that those nil | |
6210 | // checks do not cause multiple evaluation. | |
6211 | ||
6212 | Expression* | |
6213 | Bound_method_expression::do_lower(Gogo*, Named_object*, | |
6214 | Statement_inserter* inserter, int) | |
6215 | { | |
6216 | // For simplicity we use a temporary for every call to an embedded | |
6217 | // method, even though some of them might be pure value methods and | |
6218 | // not require a temporary. | |
6219 | if (this->expr_->var_expression() == NULL | |
6220 | && this->expr_->temporary_reference_expression() == NULL | |
6221 | && this->expr_->set_and_use_temporary_expression() == NULL | |
6222 | && (this->method_->field_indexes() != NULL | |
6223 | || (this->method_->is_value_method() | |
6224 | && this->expr_->type()->points_to() != NULL))) | |
6225 | { | |
6226 | Temporary_statement* temp = | |
6227 | Statement::make_temporary(this->expr_->type(), NULL, this->location()); | |
6228 | inserter->insert(temp); | |
6229 | this->expr_ = Expression::make_set_and_use_temporary(temp, this->expr_, | |
6230 | this->location()); | |
6231 | } | |
6232 | return this; | |
6233 | } | |
6234 | ||
e440a328 | 6235 | // Return the type of a bound method expression. The type of this |
0afbb937 | 6236 | // object is simply the type of the method with no receiver. |
e440a328 | 6237 | |
6238 | Type* | |
6239 | Bound_method_expression::do_type() | |
6240 | { | |
0afbb937 | 6241 | Named_object* fn = this->method_->named_object(); |
6242 | Function_type* fntype; | |
6243 | if (fn->is_function()) | |
6244 | fntype = fn->func_value()->type(); | |
6245 | else if (fn->is_function_declaration()) | |
6246 | fntype = fn->func_declaration_value()->type(); | |
e0659c9e | 6247 | else |
6248 | return Type::make_error_type(); | |
0afbb937 | 6249 | return fntype->copy_without_receiver(); |
e440a328 | 6250 | } |
6251 | ||
6252 | // Determine the types of a method expression. | |
6253 | ||
6254 | void | |
6255 | Bound_method_expression::do_determine_type(const Type_context*) | |
6256 | { | |
0afbb937 | 6257 | Named_object* fn = this->method_->named_object(); |
6258 | Function_type* fntype; | |
6259 | if (fn->is_function()) | |
6260 | fntype = fn->func_value()->type(); | |
6261 | else if (fn->is_function_declaration()) | |
6262 | fntype = fn->func_declaration_value()->type(); | |
6263 | else | |
6264 | fntype = NULL; | |
e440a328 | 6265 | if (fntype == NULL || !fntype->is_method()) |
6266 | this->expr_->determine_type_no_context(); | |
6267 | else | |
6268 | { | |
6269 | Type_context subcontext(fntype->receiver()->type(), false); | |
6270 | this->expr_->determine_type(&subcontext); | |
6271 | } | |
6272 | } | |
6273 | ||
6274 | // Check the types of a method expression. | |
6275 | ||
6276 | void | |
6277 | Bound_method_expression::do_check_types(Gogo*) | |
6278 | { | |
0afbb937 | 6279 | Named_object* fn = this->method_->named_object(); |
6280 | if (!fn->is_function() && !fn->is_function_declaration()) | |
6281 | { | |
6282 | this->report_error(_("object is not a method")); | |
6283 | return; | |
6284 | } | |
6285 | ||
6286 | Function_type* fntype; | |
6287 | if (fn->is_function()) | |
6288 | fntype = fn->func_value()->type(); | |
6289 | else if (fn->is_function_declaration()) | |
6290 | fntype = fn->func_declaration_value()->type(); | |
e440a328 | 6291 | else |
0afbb937 | 6292 | go_unreachable(); |
6293 | Type* rtype = fntype->receiver()->type()->deref(); | |
6294 | Type* etype = (this->expr_type_ != NULL | |
6295 | ? this->expr_type_ | |
6296 | : this->expr_->type()); | |
6297 | etype = etype->deref(); | |
6298 | if (!Type::are_identical(rtype, etype, true, NULL)) | |
6299 | this->report_error(_("method type does not match object type")); | |
6300 | } | |
6301 | ||
6302 | // If a bound method expression is not simply called, then it is | |
6303 | // represented as a closure. The closure will hold a single variable, | |
6304 | // the receiver to pass to the method. The function will be a simple | |
6305 | // thunk that pulls that value from the closure and calls the method | |
6306 | // with the remaining arguments. | |
6307 | // | |
6308 | // Because method values are not common, we don't build all thunks for | |
6309 | // every methods, but instead only build them as we need them. In | |
6310 | // particular, we even build them on demand for methods defined in | |
6311 | // other packages. | |
6312 | ||
6313 | Bound_method_expression::Method_value_thunks | |
6314 | Bound_method_expression::method_value_thunks; | |
6315 | ||
6316 | // Find or create the thunk for METHOD. | |
6317 | ||
6318 | Named_object* | |
6319 | Bound_method_expression::create_thunk(Gogo* gogo, const Method* method, | |
6320 | Named_object* fn) | |
6321 | { | |
6322 | std::pair<Named_object*, Named_object*> val(fn, NULL); | |
6323 | std::pair<Method_value_thunks::iterator, bool> ins = | |
6324 | Bound_method_expression::method_value_thunks.insert(val); | |
6325 | if (!ins.second) | |
6326 | { | |
6327 | // We have seen this method before. | |
6328 | go_assert(ins.first->second != NULL); | |
6329 | return ins.first->second; | |
6330 | } | |
6331 | ||
6332 | Location loc = fn->location(); | |
6333 | ||
6334 | Function_type* orig_fntype; | |
6335 | if (fn->is_function()) | |
6336 | orig_fntype = fn->func_value()->type(); | |
6337 | else if (fn->is_function_declaration()) | |
6338 | orig_fntype = fn->func_declaration_value()->type(); | |
6339 | else | |
6340 | orig_fntype = NULL; | |
6341 | ||
6342 | if (orig_fntype == NULL || !orig_fntype->is_method()) | |
e440a328 | 6343 | { |
0afbb937 | 6344 | ins.first->second = Named_object::make_erroneous_name(Gogo::thunk_name()); |
6345 | return ins.first->second; | |
e440a328 | 6346 | } |
0afbb937 | 6347 | |
6348 | Struct_field_list* sfl = new Struct_field_list(); | |
f8bdf81a | 6349 | // The type here is wrong--it should be the C function type. But it |
6350 | // doesn't really matter. | |
0afbb937 | 6351 | Type* vt = Type::make_pointer_type(Type::make_void_type()); |
6352 | sfl->push_back(Struct_field(Typed_identifier("fn.0", vt, loc))); | |
6353 | sfl->push_back(Struct_field(Typed_identifier("val.1", | |
6354 | orig_fntype->receiver()->type(), | |
6355 | loc))); | |
6356 | Type* closure_type = Type::make_struct_type(sfl, loc); | |
6357 | closure_type = Type::make_pointer_type(closure_type); | |
6358 | ||
f8bdf81a | 6359 | Function_type* new_fntype = orig_fntype->copy_with_names(); |
0afbb937 | 6360 | |
da244e59 | 6361 | std::string thunk_name = Gogo::thunk_name(); |
6362 | Named_object* new_no = gogo->start_function(thunk_name, new_fntype, | |
0afbb937 | 6363 | false, loc); |
6364 | ||
f8bdf81a | 6365 | Variable* cvar = new Variable(closure_type, NULL, false, false, false, loc); |
6366 | cvar->set_is_used(); | |
1ecc6157 | 6367 | cvar->set_is_closure(); |
da244e59 | 6368 | Named_object* cp = Named_object::make_variable("$closure" + thunk_name, |
6369 | NULL, cvar); | |
f8bdf81a | 6370 | new_no->func_value()->set_closure_var(cp); |
0afbb937 | 6371 | |
f8bdf81a | 6372 | gogo->start_block(loc); |
0afbb937 | 6373 | |
6374 | // Field 0 of the closure is the function code pointer, field 1 is | |
6375 | // the value on which to invoke the method. | |
6376 | Expression* arg = Expression::make_var_reference(cp, loc); | |
6377 | arg = Expression::make_unary(OPERATOR_MULT, arg, loc); | |
6378 | arg = Expression::make_field_reference(arg, 1, loc); | |
6379 | ||
6380 | Expression* bme = Expression::make_bound_method(arg, method, fn, loc); | |
6381 | ||
6382 | const Typed_identifier_list* orig_params = orig_fntype->parameters(); | |
6383 | Expression_list* args; | |
6384 | if (orig_params == NULL || orig_params->empty()) | |
6385 | args = NULL; | |
6386 | else | |
6387 | { | |
6388 | const Typed_identifier_list* new_params = new_fntype->parameters(); | |
6389 | args = new Expression_list(); | |
6390 | for (Typed_identifier_list::const_iterator p = new_params->begin(); | |
f8bdf81a | 6391 | p != new_params->end(); |
0afbb937 | 6392 | ++p) |
6393 | { | |
6394 | Named_object* p_no = gogo->lookup(p->name(), NULL); | |
6395 | go_assert(p_no != NULL | |
6396 | && p_no->is_variable() | |
6397 | && p_no->var_value()->is_parameter()); | |
6398 | args->push_back(Expression::make_var_reference(p_no, loc)); | |
6399 | } | |
6400 | } | |
6401 | ||
6402 | Call_expression* call = Expression::make_call(bme, args, | |
6403 | orig_fntype->is_varargs(), | |
6404 | loc); | |
6405 | call->set_varargs_are_lowered(); | |
6406 | ||
6407 | Statement* s = Statement::make_return_from_call(call, loc); | |
6408 | gogo->add_statement(s); | |
6409 | Block* b = gogo->finish_block(loc); | |
6410 | gogo->add_block(b, loc); | |
6411 | gogo->lower_block(new_no, b); | |
a32698ee | 6412 | gogo->flatten_block(new_no, b); |
0afbb937 | 6413 | gogo->finish_function(loc); |
6414 | ||
6415 | ins.first->second = new_no; | |
6416 | return new_no; | |
6417 | } | |
6418 | ||
6419 | // Return an expression to check *REF for nil while dereferencing | |
6420 | // according to FIELD_INDEXES. Update *REF to build up the field | |
6421 | // reference. This is a static function so that we don't have to | |
6422 | // worry about declaring Field_indexes in expressions.h. | |
6423 | ||
6424 | static Expression* | |
6425 | bme_check_nil(const Method::Field_indexes* field_indexes, Location loc, | |
6426 | Expression** ref) | |
6427 | { | |
6428 | if (field_indexes == NULL) | |
6429 | return Expression::make_boolean(false, loc); | |
6430 | Expression* cond = bme_check_nil(field_indexes->next, loc, ref); | |
6431 | Struct_type* stype = (*ref)->type()->deref()->struct_type(); | |
6432 | go_assert(stype != NULL | |
6433 | && field_indexes->field_index < stype->field_count()); | |
6434 | if ((*ref)->type()->struct_type() == NULL) | |
6435 | { | |
6436 | go_assert((*ref)->type()->points_to() != NULL); | |
6437 | Expression* n = Expression::make_binary(OPERATOR_EQEQ, *ref, | |
6438 | Expression::make_nil(loc), | |
6439 | loc); | |
6440 | cond = Expression::make_binary(OPERATOR_OROR, cond, n, loc); | |
6441 | *ref = Expression::make_unary(OPERATOR_MULT, *ref, loc); | |
6442 | go_assert((*ref)->type()->struct_type() == stype); | |
6443 | } | |
6444 | *ref = Expression::make_field_reference(*ref, field_indexes->field_index, | |
6445 | loc); | |
6446 | return cond; | |
e440a328 | 6447 | } |
6448 | ||
ea664253 | 6449 | // Get the backend representation for a method value. |
e440a328 | 6450 | |
ea664253 | 6451 | Bexpression* |
6452 | Bound_method_expression::do_get_backend(Translate_context* context) | |
e440a328 | 6453 | { |
0afbb937 | 6454 | Named_object* thunk = Bound_method_expression::create_thunk(context->gogo(), |
6455 | this->method_, | |
6456 | this->function_); | |
6457 | if (thunk->is_erroneous()) | |
6458 | { | |
6459 | go_assert(saw_errors()); | |
ea664253 | 6460 | return context->backend()->error_expression(); |
0afbb937 | 6461 | } |
6462 | ||
6463 | // FIXME: We should lower this earlier, but we can't lower it in the | |
6464 | // lowering pass because at that point we don't know whether we need | |
6465 | // to create the thunk or not. If the expression is called, we | |
6466 | // don't need the thunk. | |
6467 | ||
6468 | Location loc = this->location(); | |
6469 | ||
6470 | // If the method expects a value, and we have a pointer, we need to | |
6471 | // dereference the pointer. | |
6472 | ||
6473 | Named_object* fn = this->method_->named_object(); | |
6474 | Function_type* fntype; | |
6475 | if (fn->is_function()) | |
6476 | fntype = fn->func_value()->type(); | |
6477 | else if (fn->is_function_declaration()) | |
6478 | fntype = fn->func_declaration_value()->type(); | |
6479 | else | |
6480 | go_unreachable(); | |
6481 | ||
6482 | Expression* val = this->expr_; | |
6483 | if (fntype->receiver()->type()->points_to() == NULL | |
6484 | && val->type()->points_to() != NULL) | |
6485 | val = Expression::make_unary(OPERATOR_MULT, val, loc); | |
6486 | ||
6487 | // Note that we are ignoring this->expr_type_ here. The thunk will | |
6488 | // expect a closure whose second field has type this->expr_type_ (if | |
6489 | // that is not NULL). We are going to pass it a closure whose | |
6490 | // second field has type this->expr_->type(). Since | |
6491 | // this->expr_type_ is only not-NULL for pointer types, we can get | |
6492 | // away with this. | |
6493 | ||
6494 | Struct_field_list* fields = new Struct_field_list(); | |
6495 | fields->push_back(Struct_field(Typed_identifier("fn.0", | |
6496 | thunk->func_value()->type(), | |
6497 | loc))); | |
6498 | fields->push_back(Struct_field(Typed_identifier("val.1", val->type(), loc))); | |
6499 | Struct_type* st = Type::make_struct_type(fields, loc); | |
6500 | ||
6501 | Expression_list* vals = new Expression_list(); | |
6502 | vals->push_back(Expression::make_func_code_reference(thunk, loc)); | |
6503 | vals->push_back(val); | |
6504 | ||
6505 | Expression* ret = Expression::make_struct_composite_literal(st, vals, loc); | |
2c809f8f | 6506 | ret = Expression::make_heap_expression(ret, loc); |
0afbb937 | 6507 | |
0afbb937 | 6508 | // See whether the expression or any embedded pointers are nil. |
6509 | ||
df7ef1fd | 6510 | Expression* nil_check = NULL; |
0afbb937 | 6511 | Expression* expr = this->expr_; |
6512 | if (this->method_->field_indexes() != NULL) | |
6513 | { | |
6514 | // Note that we are evaluating this->expr_ twice, but that is OK | |
6515 | // because in the lowering pass we forced it into a temporary | |
6516 | // variable. | |
6517 | Expression* ref = expr; | |
6518 | nil_check = bme_check_nil(this->method_->field_indexes(), loc, &ref); | |
6519 | expr = ref; | |
6520 | } | |
6521 | ||
6522 | if (this->method_->is_value_method() && expr->type()->points_to() != NULL) | |
6523 | { | |
6524 | Expression* n = Expression::make_binary(OPERATOR_EQEQ, expr, | |
6525 | Expression::make_nil(loc), | |
6526 | loc); | |
6527 | if (nil_check == NULL) | |
6528 | nil_check = n; | |
6529 | else | |
6530 | nil_check = Expression::make_binary(OPERATOR_OROR, nil_check, n, loc); | |
6531 | } | |
6532 | ||
ea664253 | 6533 | Bexpression* bme = ret->get_backend(context); |
0afbb937 | 6534 | if (nil_check != NULL) |
6535 | { | |
df7ef1fd | 6536 | Gogo* gogo = context->gogo(); |
ea664253 | 6537 | Bexpression* crash = |
6538 | gogo->runtime_error(RUNTIME_ERROR_NIL_DEREFERENCE, | |
6539 | loc)->get_backend(context); | |
df7ef1fd | 6540 | Btype* btype = ret->type()->get_backend(gogo); |
ea664253 | 6541 | Bexpression* bcheck = nil_check->get_backend(context); |
6542 | bme = gogo->backend()->conditional_expression(btype, bcheck, crash, | |
df7ef1fd | 6543 | bme, loc); |
6544 | } | |
ea664253 | 6545 | return bme; |
e440a328 | 6546 | } |
6547 | ||
d751bb78 | 6548 | // Dump ast representation of a bound method expression. |
6549 | ||
6550 | void | |
6551 | Bound_method_expression::do_dump_expression(Ast_dump_context* ast_dump_context) | |
6552 | const | |
6553 | { | |
6554 | if (this->expr_type_ != NULL) | |
6555 | ast_dump_context->ostream() << "("; | |
6556 | ast_dump_context->dump_expression(this->expr_); | |
6557 | if (this->expr_type_ != NULL) | |
6558 | { | |
6559 | ast_dump_context->ostream() << ":"; | |
6560 | ast_dump_context->dump_type(this->expr_type_); | |
6561 | ast_dump_context->ostream() << ")"; | |
6562 | } | |
6563 | ||
0afbb937 | 6564 | ast_dump_context->ostream() << "." << this->function_->name(); |
d751bb78 | 6565 | } |
6566 | ||
e440a328 | 6567 | // Make a method expression. |
6568 | ||
6569 | Bound_method_expression* | |
0afbb937 | 6570 | Expression::make_bound_method(Expression* expr, const Method* method, |
6571 | Named_object* function, Location location) | |
e440a328 | 6572 | { |
0afbb937 | 6573 | return new Bound_method_expression(expr, method, function, location); |
e440a328 | 6574 | } |
6575 | ||
6576 | // Class Builtin_call_expression. This is used for a call to a | |
6577 | // builtin function. | |
6578 | ||
6579 | class Builtin_call_expression : public Call_expression | |
6580 | { | |
6581 | public: | |
6582 | Builtin_call_expression(Gogo* gogo, Expression* fn, Expression_list* args, | |
b13c66cd | 6583 | bool is_varargs, Location location); |
e440a328 | 6584 | |
6585 | protected: | |
6586 | // This overrides Call_expression::do_lower. | |
6587 | Expression* | |
ceeb4318 | 6588 | do_lower(Gogo*, Named_object*, Statement_inserter*, int); |
e440a328 | 6589 | |
35a54f17 | 6590 | Expression* |
6591 | do_flatten(Gogo*, Named_object*, Statement_inserter*); | |
6592 | ||
e440a328 | 6593 | bool |
6594 | do_is_constant() const; | |
6595 | ||
6596 | bool | |
0c77715b | 6597 | do_numeric_constant_value(Numeric_constant*) const; |
e440a328 | 6598 | |
4f2138d7 | 6599 | bool |
a7549a6a | 6600 | do_discarding_value(); |
6601 | ||
e440a328 | 6602 | Type* |
6603 | do_type(); | |
6604 | ||
6605 | void | |
6606 | do_determine_type(const Type_context*); | |
6607 | ||
6608 | void | |
6609 | do_check_types(Gogo*); | |
6610 | ||
6611 | Expression* | |
72666aed | 6612 | do_copy(); |
e440a328 | 6613 | |
ea664253 | 6614 | Bexpression* |
6615 | do_get_backend(Translate_context*); | |
e440a328 | 6616 | |
6617 | void | |
6618 | do_export(Export*) const; | |
6619 | ||
6620 | virtual bool | |
6621 | do_is_recover_call() const; | |
6622 | ||
6623 | virtual void | |
6624 | do_set_recover_arg(Expression*); | |
6625 | ||
6626 | private: | |
6627 | // The builtin functions. | |
6628 | enum Builtin_function_code | |
6629 | { | |
6630 | BUILTIN_INVALID, | |
6631 | ||
6632 | // Predeclared builtin functions. | |
6633 | BUILTIN_APPEND, | |
6634 | BUILTIN_CAP, | |
6635 | BUILTIN_CLOSE, | |
48080209 | 6636 | BUILTIN_COMPLEX, |
e440a328 | 6637 | BUILTIN_COPY, |
1cce762f | 6638 | BUILTIN_DELETE, |
e440a328 | 6639 | BUILTIN_IMAG, |
6640 | BUILTIN_LEN, | |
6641 | BUILTIN_MAKE, | |
6642 | BUILTIN_NEW, | |
6643 | BUILTIN_PANIC, | |
6644 | BUILTIN_PRINT, | |
6645 | BUILTIN_PRINTLN, | |
6646 | BUILTIN_REAL, | |
6647 | BUILTIN_RECOVER, | |
6648 | ||
6649 | // Builtin functions from the unsafe package. | |
6650 | BUILTIN_ALIGNOF, | |
6651 | BUILTIN_OFFSETOF, | |
6652 | BUILTIN_SIZEOF | |
6653 | }; | |
6654 | ||
6655 | Expression* | |
6656 | one_arg() const; | |
6657 | ||
6658 | bool | |
6659 | check_one_arg(); | |
6660 | ||
6661 | static Type* | |
6662 | real_imag_type(Type*); | |
6663 | ||
6664 | static Type* | |
48080209 | 6665 | complex_type(Type*); |
e440a328 | 6666 | |
a9182619 | 6667 | Expression* |
6668 | lower_make(); | |
6669 | ||
6670 | bool | |
1ad00fd4 | 6671 | check_int_value(Expression*, bool is_length); |
a9182619 | 6672 | |
e440a328 | 6673 | // A pointer back to the general IR structure. This avoids a global |
6674 | // variable, or passing it around everywhere. | |
6675 | Gogo* gogo_; | |
6676 | // The builtin function being called. | |
6677 | Builtin_function_code code_; | |
0f914071 | 6678 | // Used to stop endless loops when the length of an array uses len |
6679 | // or cap of the array itself. | |
6680 | mutable bool seen_; | |
6334270b | 6681 | // Whether the argument is set for calls to BUILTIN_RECOVER. |
6682 | bool recover_arg_is_set_; | |
e440a328 | 6683 | }; |
6684 | ||
6685 | Builtin_call_expression::Builtin_call_expression(Gogo* gogo, | |
6686 | Expression* fn, | |
6687 | Expression_list* args, | |
6688 | bool is_varargs, | |
b13c66cd | 6689 | Location location) |
e440a328 | 6690 | : Call_expression(fn, args, is_varargs, location), |
6334270b | 6691 | gogo_(gogo), code_(BUILTIN_INVALID), seen_(false), |
6692 | recover_arg_is_set_(false) | |
e440a328 | 6693 | { |
6694 | Func_expression* fnexp = this->fn()->func_expression(); | |
79651b1f | 6695 | if (fnexp == NULL) |
6696 | { | |
6697 | this->code_ = BUILTIN_INVALID; | |
6698 | return; | |
6699 | } | |
e440a328 | 6700 | const std::string& name(fnexp->named_object()->name()); |
6701 | if (name == "append") | |
6702 | this->code_ = BUILTIN_APPEND; | |
6703 | else if (name == "cap") | |
6704 | this->code_ = BUILTIN_CAP; | |
6705 | else if (name == "close") | |
6706 | this->code_ = BUILTIN_CLOSE; | |
48080209 | 6707 | else if (name == "complex") |
6708 | this->code_ = BUILTIN_COMPLEX; | |
e440a328 | 6709 | else if (name == "copy") |
6710 | this->code_ = BUILTIN_COPY; | |
1cce762f | 6711 | else if (name == "delete") |
6712 | this->code_ = BUILTIN_DELETE; | |
e440a328 | 6713 | else if (name == "imag") |
6714 | this->code_ = BUILTIN_IMAG; | |
6715 | else if (name == "len") | |
6716 | this->code_ = BUILTIN_LEN; | |
6717 | else if (name == "make") | |
6718 | this->code_ = BUILTIN_MAKE; | |
6719 | else if (name == "new") | |
6720 | this->code_ = BUILTIN_NEW; | |
6721 | else if (name == "panic") | |
6722 | this->code_ = BUILTIN_PANIC; | |
6723 | else if (name == "print") | |
6724 | this->code_ = BUILTIN_PRINT; | |
6725 | else if (name == "println") | |
6726 | this->code_ = BUILTIN_PRINTLN; | |
6727 | else if (name == "real") | |
6728 | this->code_ = BUILTIN_REAL; | |
6729 | else if (name == "recover") | |
6730 | this->code_ = BUILTIN_RECOVER; | |
6731 | else if (name == "Alignof") | |
6732 | this->code_ = BUILTIN_ALIGNOF; | |
6733 | else if (name == "Offsetof") | |
6734 | this->code_ = BUILTIN_OFFSETOF; | |
6735 | else if (name == "Sizeof") | |
6736 | this->code_ = BUILTIN_SIZEOF; | |
6737 | else | |
c3e6f413 | 6738 | go_unreachable(); |
e440a328 | 6739 | } |
6740 | ||
6741 | // Return whether this is a call to recover. This is a virtual | |
6742 | // function called from the parent class. | |
6743 | ||
6744 | bool | |
6745 | Builtin_call_expression::do_is_recover_call() const | |
6746 | { | |
6747 | if (this->classification() == EXPRESSION_ERROR) | |
6748 | return false; | |
6749 | return this->code_ == BUILTIN_RECOVER; | |
6750 | } | |
6751 | ||
6752 | // Set the argument for a call to recover. | |
6753 | ||
6754 | void | |
6755 | Builtin_call_expression::do_set_recover_arg(Expression* arg) | |
6756 | { | |
6757 | const Expression_list* args = this->args(); | |
c484d925 | 6758 | go_assert(args == NULL || args->empty()); |
e440a328 | 6759 | Expression_list* new_args = new Expression_list(); |
6760 | new_args->push_back(arg); | |
6761 | this->set_args(new_args); | |
6334270b | 6762 | this->recover_arg_is_set_ = true; |
e440a328 | 6763 | } |
6764 | ||
e440a328 | 6765 | // Lower a builtin call expression. This turns new and make into |
6766 | // specific expressions. We also convert to a constant if we can. | |
6767 | ||
6768 | Expression* | |
ceeb4318 | 6769 | Builtin_call_expression::do_lower(Gogo* gogo, Named_object* function, |
6770 | Statement_inserter* inserter, int) | |
e440a328 | 6771 | { |
79651b1f | 6772 | if (this->is_error_expression()) |
a9182619 | 6773 | return this; |
6774 | ||
b13c66cd | 6775 | Location loc = this->location(); |
1cce762f | 6776 | |
a8725655 | 6777 | if (this->is_varargs() && this->code_ != BUILTIN_APPEND) |
6778 | { | |
6779 | this->report_error(_("invalid use of %<...%> with builtin function")); | |
1cce762f | 6780 | return Expression::make_error(loc); |
a8725655 | 6781 | } |
6782 | ||
393ba00b | 6783 | if (this->code_ == BUILTIN_OFFSETOF) |
6784 | { | |
6785 | Expression* arg = this->one_arg(); | |
12e69faa | 6786 | |
6787 | if (arg->bound_method_expression() != NULL | |
6788 | || arg->interface_field_reference_expression() != NULL) | |
6789 | { | |
6790 | this->report_error(_("invalid use of method value as argument " | |
6791 | "of Offsetof")); | |
6792 | return this; | |
6793 | } | |
6794 | ||
393ba00b | 6795 | Field_reference_expression* farg = arg->field_reference_expression(); |
6796 | while (farg != NULL) | |
6797 | { | |
6798 | if (!farg->implicit()) | |
6799 | break; | |
6800 | // When the selector refers to an embedded field, | |
6801 | // it must not be reached through pointer indirections. | |
6802 | if (farg->expr()->deref() != farg->expr()) | |
6803 | { | |
12e69faa | 6804 | this->report_error(_("argument of Offsetof implies " |
6805 | "indirection of an embedded field")); | |
393ba00b | 6806 | return this; |
6807 | } | |
6808 | // Go up until we reach the original base. | |
6809 | farg = farg->expr()->field_reference_expression(); | |
6810 | } | |
6811 | } | |
6812 | ||
1cce762f | 6813 | if (this->is_constant()) |
e440a328 | 6814 | { |
0c77715b | 6815 | Numeric_constant nc; |
6816 | if (this->numeric_constant_value(&nc)) | |
6817 | return nc.expression(loc); | |
e440a328 | 6818 | } |
1cce762f | 6819 | |
6820 | switch (this->code_) | |
e440a328 | 6821 | { |
1cce762f | 6822 | default: |
6823 | break; | |
6824 | ||
6825 | case BUILTIN_NEW: | |
6826 | { | |
6827 | const Expression_list* args = this->args(); | |
6828 | if (args == NULL || args->size() < 1) | |
6829 | this->report_error(_("not enough arguments")); | |
6830 | else if (args->size() > 1) | |
6831 | this->report_error(_("too many arguments")); | |
6832 | else | |
6833 | { | |
6834 | Expression* arg = args->front(); | |
6835 | if (!arg->is_type_expression()) | |
6836 | { | |
6837 | error_at(arg->location(), "expected type"); | |
6838 | this->set_is_error(); | |
6839 | } | |
6840 | else | |
6841 | return Expression::make_allocation(arg->type(), loc); | |
6842 | } | |
6843 | } | |
6844 | break; | |
6845 | ||
6846 | case BUILTIN_MAKE: | |
6847 | return this->lower_make(); | |
6848 | ||
6849 | case BUILTIN_RECOVER: | |
e440a328 | 6850 | if (function != NULL) |
6851 | function->func_value()->set_calls_recover(); | |
6852 | else | |
6853 | { | |
6854 | // Calling recover outside of a function always returns the | |
6855 | // nil empty interface. | |
823c7e3d | 6856 | Type* eface = Type::make_empty_interface_type(loc); |
1cce762f | 6857 | return Expression::make_cast(eface, Expression::make_nil(loc), loc); |
e440a328 | 6858 | } |
1cce762f | 6859 | break; |
6860 | ||
6861 | case BUILTIN_APPEND: | |
6862 | { | |
6863 | // Lower the varargs. | |
6864 | const Expression_list* args = this->args(); | |
6865 | if (args == NULL || args->empty()) | |
e440a328 | 6866 | return this; |
1cce762f | 6867 | Type* slice_type = args->front()->type(); |
6868 | if (!slice_type->is_slice_type()) | |
6869 | { | |
3ff4863b | 6870 | if (slice_type->is_nil_type()) |
6871 | error_at(args->front()->location(), "use of untyped nil"); | |
6872 | else | |
6873 | error_at(args->front()->location(), | |
6874 | "argument 1 must be a slice"); | |
1cce762f | 6875 | this->set_is_error(); |
6876 | return this; | |
6877 | } | |
19fd40c3 | 6878 | Type* element_type = slice_type->array_type()->element_type(); |
6879 | this->lower_varargs(gogo, function, inserter, | |
6880 | Type::make_array_type(element_type, NULL), | |
6881 | 2); | |
1cce762f | 6882 | } |
6883 | break; | |
6884 | ||
6885 | case BUILTIN_DELETE: | |
6886 | { | |
6887 | // Lower to a runtime function call. | |
6888 | const Expression_list* args = this->args(); | |
6889 | if (args == NULL || args->size() < 2) | |
6890 | this->report_error(_("not enough arguments")); | |
6891 | else if (args->size() > 2) | |
6892 | this->report_error(_("too many arguments")); | |
6893 | else if (args->front()->type()->map_type() == NULL) | |
6894 | this->report_error(_("argument 1 must be a map")); | |
6895 | else | |
6896 | { | |
6897 | // Since this function returns no value it must appear in | |
6898 | // a statement by itself, so we don't have to worry about | |
6899 | // order of evaluation of values around it. Evaluate the | |
6900 | // map first to get order of evaluation right. | |
6901 | Map_type* mt = args->front()->type()->map_type(); | |
6902 | Temporary_statement* map_temp = | |
6903 | Statement::make_temporary(mt, args->front(), loc); | |
6904 | inserter->insert(map_temp); | |
6905 | ||
6906 | Temporary_statement* key_temp = | |
6907 | Statement::make_temporary(mt->key_type(), args->back(), loc); | |
6908 | inserter->insert(key_temp); | |
6909 | ||
6910 | Expression* e1 = Expression::make_temporary_reference(map_temp, | |
6911 | loc); | |
6912 | Expression* e2 = Expression::make_temporary_reference(key_temp, | |
6913 | loc); | |
6914 | e2 = Expression::make_unary(OPERATOR_AND, e2, loc); | |
6915 | return Runtime::make_call(Runtime::MAPDELETE, this->location(), | |
6916 | 2, e1, e2); | |
6917 | } | |
6918 | } | |
6919 | break; | |
e440a328 | 6920 | } |
6921 | ||
6922 | return this; | |
6923 | } | |
6924 | ||
35a54f17 | 6925 | // Flatten a builtin call expression. This turns the arguments of copy and |
6926 | // append into temporary expressions. | |
6927 | ||
6928 | Expression* | |
6929 | Builtin_call_expression::do_flatten(Gogo*, Named_object*, | |
6930 | Statement_inserter* inserter) | |
6931 | { | |
16cb7fec | 6932 | Location loc = this->location(); |
6933 | ||
6934 | switch (this->code_) | |
35a54f17 | 6935 | { |
16cb7fec | 6936 | default: |
6937 | break; | |
6938 | ||
6939 | case BUILTIN_APPEND: | |
6940 | case BUILTIN_COPY: | |
6941 | { | |
6942 | Type* at = this->args()->front()->type(); | |
6943 | for (Expression_list::iterator pa = this->args()->begin(); | |
6944 | pa != this->args()->end(); | |
6945 | ++pa) | |
6946 | { | |
6947 | if ((*pa)->is_nil_expression()) | |
6948 | { | |
6949 | Expression* nil = Expression::make_nil(loc); | |
6950 | Expression* zero = Expression::make_integer_ul(0, NULL, loc); | |
6951 | *pa = Expression::make_slice_value(at, nil, zero, zero, loc); | |
6952 | } | |
6953 | if (!(*pa)->is_variable()) | |
6954 | { | |
6955 | Temporary_statement* temp = | |
6956 | Statement::make_temporary(NULL, *pa, loc); | |
6957 | inserter->insert(temp); | |
6958 | *pa = Expression::make_temporary_reference(temp, loc); | |
6959 | } | |
6960 | } | |
6961 | } | |
6962 | break; | |
6963 | ||
6964 | case BUILTIN_PANIC: | |
35a54f17 | 6965 | for (Expression_list::iterator pa = this->args()->begin(); |
16cb7fec | 6966 | pa != this->args()->end(); |
6967 | ++pa) | |
6968 | { | |
6969 | if (!(*pa)->is_variable() && (*pa)->type()->interface_type() != NULL) | |
55e8ba6a | 6970 | { |
16cb7fec | 6971 | Temporary_statement* temp = |
6972 | Statement::make_temporary(NULL, *pa, loc); | |
6973 | inserter->insert(temp); | |
6974 | *pa = Expression::make_temporary_reference(temp, loc); | |
55e8ba6a | 6975 | } |
16cb7fec | 6976 | } |
35a54f17 | 6977 | } |
16cb7fec | 6978 | |
35a54f17 | 6979 | return this; |
6980 | } | |
6981 | ||
a9182619 | 6982 | // Lower a make expression. |
6983 | ||
6984 | Expression* | |
6985 | Builtin_call_expression::lower_make() | |
6986 | { | |
b13c66cd | 6987 | Location loc = this->location(); |
a9182619 | 6988 | |
6989 | const Expression_list* args = this->args(); | |
6990 | if (args == NULL || args->size() < 1) | |
6991 | { | |
6992 | this->report_error(_("not enough arguments")); | |
6993 | return Expression::make_error(this->location()); | |
6994 | } | |
6995 | ||
6996 | Expression_list::const_iterator parg = args->begin(); | |
6997 | ||
6998 | Expression* first_arg = *parg; | |
6999 | if (!first_arg->is_type_expression()) | |
7000 | { | |
7001 | error_at(first_arg->location(), "expected type"); | |
7002 | this->set_is_error(); | |
7003 | return Expression::make_error(this->location()); | |
7004 | } | |
7005 | Type* type = first_arg->type(); | |
7006 | ||
7007 | bool is_slice = false; | |
7008 | bool is_map = false; | |
7009 | bool is_chan = false; | |
411eb89e | 7010 | if (type->is_slice_type()) |
a9182619 | 7011 | is_slice = true; |
7012 | else if (type->map_type() != NULL) | |
7013 | is_map = true; | |
7014 | else if (type->channel_type() != NULL) | |
7015 | is_chan = true; | |
7016 | else | |
7017 | { | |
7018 | this->report_error(_("invalid type for make function")); | |
7019 | return Expression::make_error(this->location()); | |
7020 | } | |
7021 | ||
ac84c822 | 7022 | bool have_big_args = false; |
7023 | Type* uintptr_type = Type::lookup_integer_type("uintptr"); | |
7024 | int uintptr_bits = uintptr_type->integer_type()->bits(); | |
7025 | ||
f6bc81e6 | 7026 | Type_context int_context(Type::lookup_integer_type("int"), false); |
7027 | ||
a9182619 | 7028 | ++parg; |
7029 | Expression* len_arg; | |
7030 | if (parg == args->end()) | |
7031 | { | |
7032 | if (is_slice) | |
7033 | { | |
7034 | this->report_error(_("length required when allocating a slice")); | |
7035 | return Expression::make_error(this->location()); | |
7036 | } | |
e67508fa | 7037 | len_arg = Expression::make_integer_ul(0, NULL, loc); |
a9182619 | 7038 | } |
7039 | else | |
7040 | { | |
7041 | len_arg = *parg; | |
f6bc81e6 | 7042 | len_arg->determine_type(&int_context); |
1ad00fd4 | 7043 | if (!this->check_int_value(len_arg, true)) |
7044 | return Expression::make_error(this->location()); | |
ac84c822 | 7045 | if (len_arg->type()->integer_type() != NULL |
7046 | && len_arg->type()->integer_type()->bits() > uintptr_bits) | |
7047 | have_big_args = true; | |
a9182619 | 7048 | ++parg; |
7049 | } | |
7050 | ||
7051 | Expression* cap_arg = NULL; | |
7052 | if (is_slice && parg != args->end()) | |
7053 | { | |
7054 | cap_arg = *parg; | |
f6bc81e6 | 7055 | cap_arg->determine_type(&int_context); |
1ad00fd4 | 7056 | if (!this->check_int_value(cap_arg, false)) |
7057 | return Expression::make_error(this->location()); | |
7058 | ||
7059 | Numeric_constant nclen; | |
7060 | Numeric_constant nccap; | |
7061 | unsigned long vlen; | |
7062 | unsigned long vcap; | |
7063 | if (len_arg->numeric_constant_value(&nclen) | |
7064 | && cap_arg->numeric_constant_value(&nccap) | |
7065 | && nclen.to_unsigned_long(&vlen) == Numeric_constant::NC_UL_VALID | |
7066 | && nccap.to_unsigned_long(&vcap) == Numeric_constant::NC_UL_VALID | |
7067 | && vlen > vcap) | |
a9182619 | 7068 | { |
1ad00fd4 | 7069 | this->report_error(_("len larger than cap")); |
a9182619 | 7070 | return Expression::make_error(this->location()); |
7071 | } | |
1ad00fd4 | 7072 | |
ac84c822 | 7073 | if (cap_arg->type()->integer_type() != NULL |
7074 | && cap_arg->type()->integer_type()->bits() > uintptr_bits) | |
7075 | have_big_args = true; | |
a9182619 | 7076 | ++parg; |
7077 | } | |
7078 | ||
7079 | if (parg != args->end()) | |
7080 | { | |
7081 | this->report_error(_("too many arguments to make")); | |
7082 | return Expression::make_error(this->location()); | |
7083 | } | |
7084 | ||
b13c66cd | 7085 | Location type_loc = first_arg->location(); |
a9182619 | 7086 | Expression* type_arg; |
7087 | if (is_slice || is_chan) | |
7088 | type_arg = Expression::make_type_descriptor(type, type_loc); | |
7089 | else if (is_map) | |
7090 | type_arg = Expression::make_map_descriptor(type->map_type(), type_loc); | |
7091 | else | |
7092 | go_unreachable(); | |
7093 | ||
7094 | Expression* call; | |
7095 | if (is_slice) | |
7096 | { | |
7097 | if (cap_arg == NULL) | |
ac84c822 | 7098 | call = Runtime::make_call((have_big_args |
7099 | ? Runtime::MAKESLICE1BIG | |
7100 | : Runtime::MAKESLICE1), | |
7101 | loc, 2, type_arg, len_arg); | |
a9182619 | 7102 | else |
ac84c822 | 7103 | call = Runtime::make_call((have_big_args |
7104 | ? Runtime::MAKESLICE2BIG | |
7105 | : Runtime::MAKESLICE2), | |
7106 | loc, 3, type_arg, len_arg, cap_arg); | |
a9182619 | 7107 | } |
7108 | else if (is_map) | |
ac84c822 | 7109 | call = Runtime::make_call((have_big_args |
7110 | ? Runtime::MAKEMAPBIG | |
7111 | : Runtime::MAKEMAP), | |
7112 | loc, 2, type_arg, len_arg); | |
a9182619 | 7113 | else if (is_chan) |
ac84c822 | 7114 | call = Runtime::make_call((have_big_args |
7115 | ? Runtime::MAKECHANBIG | |
7116 | : Runtime::MAKECHAN), | |
7117 | loc, 2, type_arg, len_arg); | |
a9182619 | 7118 | else |
7119 | go_unreachable(); | |
7120 | ||
7121 | return Expression::make_unsafe_cast(type, call, loc); | |
7122 | } | |
7123 | ||
7124 | // Return whether an expression has an integer value. Report an error | |
7125 | // if not. This is used when handling calls to the predeclared make | |
7126 | // function. | |
7127 | ||
7128 | bool | |
1ad00fd4 | 7129 | Builtin_call_expression::check_int_value(Expression* e, bool is_length) |
a9182619 | 7130 | { |
0c77715b | 7131 | Numeric_constant nc; |
1ad00fd4 | 7132 | if (e->numeric_constant_value(&nc)) |
a9182619 | 7133 | { |
1ad00fd4 | 7134 | unsigned long v; |
7135 | switch (nc.to_unsigned_long(&v)) | |
7136 | { | |
7137 | case Numeric_constant::NC_UL_VALID: | |
1b10c5e7 | 7138 | break; |
1ad00fd4 | 7139 | case Numeric_constant::NC_UL_NOTINT: |
7140 | error_at(e->location(), "non-integer %s argument to make", | |
7141 | is_length ? "len" : "cap"); | |
7142 | return false; | |
7143 | case Numeric_constant::NC_UL_NEGATIVE: | |
7144 | error_at(e->location(), "negative %s argument to make", | |
7145 | is_length ? "len" : "cap"); | |
7146 | return false; | |
7147 | case Numeric_constant::NC_UL_BIG: | |
7148 | // We don't want to give a compile-time error for a 64-bit | |
7149 | // value on a 32-bit target. | |
1b10c5e7 | 7150 | break; |
1ad00fd4 | 7151 | } |
1b10c5e7 | 7152 | |
7153 | mpz_t val; | |
7154 | if (!nc.to_int(&val)) | |
7155 | go_unreachable(); | |
7156 | int bits = mpz_sizeinbase(val, 2); | |
7157 | mpz_clear(val); | |
7158 | Type* int_type = Type::lookup_integer_type("int"); | |
7159 | if (bits >= int_type->integer_type()->bits()) | |
7160 | { | |
7161 | error_at(e->location(), "%s argument too large for make", | |
7162 | is_length ? "len" : "cap"); | |
7163 | return false; | |
7164 | } | |
7165 | ||
7166 | return true; | |
a9182619 | 7167 | } |
7168 | ||
1ad00fd4 | 7169 | if (e->type()->integer_type() != NULL) |
7170 | return true; | |
7171 | ||
7172 | error_at(e->location(), "non-integer %s argument to make", | |
7173 | is_length ? "len" : "cap"); | |
a9182619 | 7174 | return false; |
7175 | } | |
7176 | ||
e440a328 | 7177 | // Return the type of the real or imag functions, given the type of |
fcbea5e4 | 7178 | // the argument. We need to map complex64 to float32 and complex128 |
7179 | // to float64, so it has to be done by name. This returns NULL if it | |
7180 | // can't figure out the type. | |
e440a328 | 7181 | |
7182 | Type* | |
7183 | Builtin_call_expression::real_imag_type(Type* arg_type) | |
7184 | { | |
7185 | if (arg_type == NULL || arg_type->is_abstract()) | |
7186 | return NULL; | |
7187 | Named_type* nt = arg_type->named_type(); | |
7188 | if (nt == NULL) | |
7189 | return NULL; | |
7190 | while (nt->real_type()->named_type() != NULL) | |
7191 | nt = nt->real_type()->named_type(); | |
48080209 | 7192 | if (nt->name() == "complex64") |
e440a328 | 7193 | return Type::lookup_float_type("float32"); |
7194 | else if (nt->name() == "complex128") | |
7195 | return Type::lookup_float_type("float64"); | |
7196 | else | |
7197 | return NULL; | |
7198 | } | |
7199 | ||
48080209 | 7200 | // Return the type of the complex function, given the type of one of the |
e440a328 | 7201 | // argments. Like real_imag_type, we have to map by name. |
7202 | ||
7203 | Type* | |
48080209 | 7204 | Builtin_call_expression::complex_type(Type* arg_type) |
e440a328 | 7205 | { |
7206 | if (arg_type == NULL || arg_type->is_abstract()) | |
7207 | return NULL; | |
7208 | Named_type* nt = arg_type->named_type(); | |
7209 | if (nt == NULL) | |
7210 | return NULL; | |
7211 | while (nt->real_type()->named_type() != NULL) | |
7212 | nt = nt->real_type()->named_type(); | |
48080209 | 7213 | if (nt->name() == "float32") |
e440a328 | 7214 | return Type::lookup_complex_type("complex64"); |
7215 | else if (nt->name() == "float64") | |
7216 | return Type::lookup_complex_type("complex128"); | |
7217 | else | |
7218 | return NULL; | |
7219 | } | |
7220 | ||
7221 | // Return a single argument, or NULL if there isn't one. | |
7222 | ||
7223 | Expression* | |
7224 | Builtin_call_expression::one_arg() const | |
7225 | { | |
7226 | const Expression_list* args = this->args(); | |
aa615cb3 | 7227 | if (args == NULL || args->size() != 1) |
e440a328 | 7228 | return NULL; |
7229 | return args->front(); | |
7230 | } | |
7231 | ||
83921647 | 7232 | // A traversal class which looks for a call or receive expression. |
7233 | ||
7234 | class Find_call_expression : public Traverse | |
7235 | { | |
7236 | public: | |
7237 | Find_call_expression() | |
7238 | : Traverse(traverse_expressions), | |
7239 | found_(false) | |
7240 | { } | |
7241 | ||
7242 | int | |
7243 | expression(Expression**); | |
7244 | ||
7245 | bool | |
7246 | found() | |
7247 | { return this->found_; } | |
7248 | ||
7249 | private: | |
7250 | bool found_; | |
7251 | }; | |
7252 | ||
7253 | int | |
7254 | Find_call_expression::expression(Expression** pexpr) | |
7255 | { | |
7256 | if ((*pexpr)->call_expression() != NULL | |
7257 | || (*pexpr)->receive_expression() != NULL) | |
7258 | { | |
7259 | this->found_ = true; | |
7260 | return TRAVERSE_EXIT; | |
7261 | } | |
7262 | return TRAVERSE_CONTINUE; | |
7263 | } | |
7264 | ||
7265 | // Return whether this is constant: len of a string constant, or len | |
7266 | // or cap of an array, or unsafe.Sizeof, unsafe.Offsetof, | |
7267 | // unsafe.Alignof. | |
e440a328 | 7268 | |
7269 | bool | |
7270 | Builtin_call_expression::do_is_constant() const | |
7271 | { | |
12e69faa | 7272 | if (this->is_error_expression()) |
7273 | return true; | |
e440a328 | 7274 | switch (this->code_) |
7275 | { | |
7276 | case BUILTIN_LEN: | |
7277 | case BUILTIN_CAP: | |
7278 | { | |
0f914071 | 7279 | if (this->seen_) |
7280 | return false; | |
7281 | ||
e440a328 | 7282 | Expression* arg = this->one_arg(); |
7283 | if (arg == NULL) | |
7284 | return false; | |
7285 | Type* arg_type = arg->type(); | |
7286 | ||
7287 | if (arg_type->points_to() != NULL | |
7288 | && arg_type->points_to()->array_type() != NULL | |
411eb89e | 7289 | && !arg_type->points_to()->is_slice_type()) |
e440a328 | 7290 | arg_type = arg_type->points_to(); |
7291 | ||
83921647 | 7292 | // The len and cap functions are only constant if there are no |
7293 | // function calls or channel operations in the arguments. | |
7294 | // Otherwise we have to make the call. | |
7295 | if (!arg->is_constant()) | |
7296 | { | |
7297 | Find_call_expression find_call; | |
7298 | Expression::traverse(&arg, &find_call); | |
7299 | if (find_call.found()) | |
7300 | return false; | |
7301 | } | |
7302 | ||
e440a328 | 7303 | if (arg_type->array_type() != NULL |
7304 | && arg_type->array_type()->length() != NULL) | |
0f914071 | 7305 | return true; |
e440a328 | 7306 | |
7307 | if (this->code_ == BUILTIN_LEN && arg_type->is_string_type()) | |
0f914071 | 7308 | { |
7309 | this->seen_ = true; | |
7310 | bool ret = arg->is_constant(); | |
7311 | this->seen_ = false; | |
7312 | return ret; | |
7313 | } | |
e440a328 | 7314 | } |
7315 | break; | |
7316 | ||
7317 | case BUILTIN_SIZEOF: | |
7318 | case BUILTIN_ALIGNOF: | |
7319 | return this->one_arg() != NULL; | |
7320 | ||
7321 | case BUILTIN_OFFSETOF: | |
7322 | { | |
7323 | Expression* arg = this->one_arg(); | |
7324 | if (arg == NULL) | |
7325 | return false; | |
7326 | return arg->field_reference_expression() != NULL; | |
7327 | } | |
7328 | ||
48080209 | 7329 | case BUILTIN_COMPLEX: |
e440a328 | 7330 | { |
7331 | const Expression_list* args = this->args(); | |
7332 | if (args != NULL && args->size() == 2) | |
7333 | return args->front()->is_constant() && args->back()->is_constant(); | |
7334 | } | |
7335 | break; | |
7336 | ||
7337 | case BUILTIN_REAL: | |
7338 | case BUILTIN_IMAG: | |
7339 | { | |
7340 | Expression* arg = this->one_arg(); | |
7341 | return arg != NULL && arg->is_constant(); | |
7342 | } | |
7343 | ||
7344 | default: | |
7345 | break; | |
7346 | } | |
7347 | ||
7348 | return false; | |
7349 | } | |
7350 | ||
0c77715b | 7351 | // Return a numeric constant if possible. |
e440a328 | 7352 | |
7353 | bool | |
0c77715b | 7354 | Builtin_call_expression::do_numeric_constant_value(Numeric_constant* nc) const |
e440a328 | 7355 | { |
7356 | if (this->code_ == BUILTIN_LEN | |
7357 | || this->code_ == BUILTIN_CAP) | |
7358 | { | |
7359 | Expression* arg = this->one_arg(); | |
7360 | if (arg == NULL) | |
7361 | return false; | |
7362 | Type* arg_type = arg->type(); | |
7363 | ||
7364 | if (this->code_ == BUILTIN_LEN && arg_type->is_string_type()) | |
7365 | { | |
7366 | std::string sval; | |
7367 | if (arg->string_constant_value(&sval)) | |
7368 | { | |
0c77715b | 7369 | nc->set_unsigned_long(Type::lookup_integer_type("int"), |
7370 | sval.length()); | |
e440a328 | 7371 | return true; |
7372 | } | |
7373 | } | |
7374 | ||
7375 | if (arg_type->points_to() != NULL | |
7376 | && arg_type->points_to()->array_type() != NULL | |
411eb89e | 7377 | && !arg_type->points_to()->is_slice_type()) |
e440a328 | 7378 | arg_type = arg_type->points_to(); |
7379 | ||
7380 | if (arg_type->array_type() != NULL | |
7381 | && arg_type->array_type()->length() != NULL) | |
7382 | { | |
0f914071 | 7383 | if (this->seen_) |
7384 | return false; | |
e440a328 | 7385 | Expression* e = arg_type->array_type()->length(); |
0f914071 | 7386 | this->seen_ = true; |
0c77715b | 7387 | bool r = e->numeric_constant_value(nc); |
0f914071 | 7388 | this->seen_ = false; |
7389 | if (r) | |
e440a328 | 7390 | { |
0c77715b | 7391 | if (!nc->set_type(Type::lookup_integer_type("int"), false, |
7392 | this->location())) | |
7393 | r = false; | |
e440a328 | 7394 | } |
0c77715b | 7395 | return r; |
e440a328 | 7396 | } |
7397 | } | |
7398 | else if (this->code_ == BUILTIN_SIZEOF | |
7399 | || this->code_ == BUILTIN_ALIGNOF) | |
7400 | { | |
7401 | Expression* arg = this->one_arg(); | |
7402 | if (arg == NULL) | |
7403 | return false; | |
7404 | Type* arg_type = arg->type(); | |
5c13bd80 | 7405 | if (arg_type->is_error()) |
e440a328 | 7406 | return false; |
7407 | if (arg_type->is_abstract()) | |
7408 | return false; | |
2c809f8f | 7409 | if (this->seen_) |
7410 | return false; | |
927a01eb | 7411 | |
3f378015 | 7412 | int64_t ret; |
e440a328 | 7413 | if (this->code_ == BUILTIN_SIZEOF) |
7414 | { | |
2c809f8f | 7415 | this->seen_ = true; |
7416 | bool ok = arg_type->backend_type_size(this->gogo_, &ret); | |
7417 | this->seen_ = false; | |
7418 | if (!ok) | |
e440a328 | 7419 | return false; |
7420 | } | |
7421 | else if (this->code_ == BUILTIN_ALIGNOF) | |
7422 | { | |
2c809f8f | 7423 | bool ok; |
7424 | this->seen_ = true; | |
637bd3af | 7425 | if (arg->field_reference_expression() == NULL) |
2c809f8f | 7426 | ok = arg_type->backend_type_align(this->gogo_, &ret); |
637bd3af | 7427 | else |
e440a328 | 7428 | { |
7429 | // Calling unsafe.Alignof(s.f) returns the alignment of | |
7430 | // the type of f when it is used as a field in a struct. | |
2c809f8f | 7431 | ok = arg_type->backend_type_field_align(this->gogo_, &ret); |
e440a328 | 7432 | } |
2c809f8f | 7433 | this->seen_ = false; |
7434 | if (!ok) | |
7435 | return false; | |
e440a328 | 7436 | } |
7437 | else | |
c3e6f413 | 7438 | go_unreachable(); |
927a01eb | 7439 | |
3f378015 | 7440 | mpz_t zval; |
7441 | set_mpz_from_int64(&zval, ret); | |
7442 | nc->set_int(Type::lookup_integer_type("uintptr"), zval); | |
7443 | mpz_clear(zval); | |
e440a328 | 7444 | return true; |
7445 | } | |
7446 | else if (this->code_ == BUILTIN_OFFSETOF) | |
7447 | { | |
7448 | Expression* arg = this->one_arg(); | |
7449 | if (arg == NULL) | |
7450 | return false; | |
7451 | Field_reference_expression* farg = arg->field_reference_expression(); | |
7452 | if (farg == NULL) | |
7453 | return false; | |
2c809f8f | 7454 | if (this->seen_) |
7455 | return false; | |
7456 | ||
3f378015 | 7457 | int64_t total_offset = 0; |
9a4bd570 | 7458 | while (true) |
7459 | { | |
7460 | Expression* struct_expr = farg->expr(); | |
7461 | Type* st = struct_expr->type(); | |
7462 | if (st->struct_type() == NULL) | |
7463 | return false; | |
7464 | if (st->named_type() != NULL) | |
7465 | st->named_type()->convert(this->gogo_); | |
3f378015 | 7466 | int64_t offset; |
2c809f8f | 7467 | this->seen_ = true; |
7468 | bool ok = st->struct_type()->backend_field_offset(this->gogo_, | |
7469 | farg->field_index(), | |
7470 | &offset); | |
7471 | this->seen_ = false; | |
7472 | if (!ok) | |
7473 | return false; | |
9a4bd570 | 7474 | total_offset += offset; |
7475 | if (farg->implicit() && struct_expr->field_reference_expression() != NULL) | |
7476 | { | |
7477 | // Go up until we reach the original base. | |
7478 | farg = struct_expr->field_reference_expression(); | |
7479 | continue; | |
7480 | } | |
7481 | break; | |
7482 | } | |
3f378015 | 7483 | mpz_t zval; |
7484 | set_mpz_from_int64(&zval, total_offset); | |
7485 | nc->set_int(Type::lookup_integer_type("uintptr"), zval); | |
7486 | mpz_clear(zval); | |
e440a328 | 7487 | return true; |
7488 | } | |
0c77715b | 7489 | else if (this->code_ == BUILTIN_REAL || this->code_ == BUILTIN_IMAG) |
e440a328 | 7490 | { |
7491 | Expression* arg = this->one_arg(); | |
7492 | if (arg == NULL) | |
7493 | return false; | |
7494 | ||
0c77715b | 7495 | Numeric_constant argnc; |
7496 | if (!arg->numeric_constant_value(&argnc)) | |
7497 | return false; | |
7498 | ||
fcbea5e4 | 7499 | mpc_t val; |
7500 | if (!argnc.to_complex(&val)) | |
0c77715b | 7501 | return false; |
e440a328 | 7502 | |
0c77715b | 7503 | Type* type = Builtin_call_expression::real_imag_type(argnc.type()); |
7504 | if (this->code_ == BUILTIN_REAL) | |
fcbea5e4 | 7505 | nc->set_float(type, mpc_realref(val)); |
0c77715b | 7506 | else |
fcbea5e4 | 7507 | nc->set_float(type, mpc_imagref(val)); |
7508 | mpc_clear(val); | |
0c77715b | 7509 | return true; |
e440a328 | 7510 | } |
0c77715b | 7511 | else if (this->code_ == BUILTIN_COMPLEX) |
e440a328 | 7512 | { |
7513 | const Expression_list* args = this->args(); | |
7514 | if (args == NULL || args->size() != 2) | |
7515 | return false; | |
7516 | ||
0c77715b | 7517 | Numeric_constant rnc; |
7518 | if (!args->front()->numeric_constant_value(&rnc)) | |
7519 | return false; | |
7520 | Numeric_constant inc; | |
7521 | if (!args->back()->numeric_constant_value(&inc)) | |
7522 | return false; | |
7523 | ||
7524 | if (rnc.type() != NULL | |
7525 | && !rnc.type()->is_abstract() | |
7526 | && inc.type() != NULL | |
7527 | && !inc.type()->is_abstract() | |
7528 | && !Type::are_identical(rnc.type(), inc.type(), false, NULL)) | |
7529 | return false; | |
7530 | ||
e440a328 | 7531 | mpfr_t r; |
0c77715b | 7532 | if (!rnc.to_float(&r)) |
7533 | return false; | |
7534 | mpfr_t i; | |
7535 | if (!inc.to_float(&i)) | |
e440a328 | 7536 | { |
7537 | mpfr_clear(r); | |
7538 | return false; | |
7539 | } | |
7540 | ||
0c77715b | 7541 | Type* arg_type = rnc.type(); |
7542 | if (arg_type == NULL || arg_type->is_abstract()) | |
7543 | arg_type = inc.type(); | |
e440a328 | 7544 | |
fcbea5e4 | 7545 | mpc_t val; |
7546 | mpc_init2(val, mpc_precision); | |
7547 | mpc_set_fr_fr(val, r, i, MPC_RNDNN); | |
e440a328 | 7548 | mpfr_clear(r); |
7549 | mpfr_clear(i); | |
7550 | ||
fcbea5e4 | 7551 | Type* type = Builtin_call_expression::complex_type(arg_type); |
7552 | nc->set_complex(type, val); | |
7553 | ||
7554 | mpc_clear(val); | |
7555 | ||
0c77715b | 7556 | return true; |
e440a328 | 7557 | } |
7558 | ||
7559 | return false; | |
7560 | } | |
7561 | ||
a7549a6a | 7562 | // Give an error if we are discarding the value of an expression which |
7563 | // should not normally be discarded. We don't give an error for | |
7564 | // discarding the value of an ordinary function call, but we do for | |
7565 | // builtin functions, purely for consistency with the gc compiler. | |
7566 | ||
4f2138d7 | 7567 | bool |
a7549a6a | 7568 | Builtin_call_expression::do_discarding_value() |
7569 | { | |
7570 | switch (this->code_) | |
7571 | { | |
7572 | case BUILTIN_INVALID: | |
7573 | default: | |
7574 | go_unreachable(); | |
7575 | ||
7576 | case BUILTIN_APPEND: | |
7577 | case BUILTIN_CAP: | |
7578 | case BUILTIN_COMPLEX: | |
7579 | case BUILTIN_IMAG: | |
7580 | case BUILTIN_LEN: | |
7581 | case BUILTIN_MAKE: | |
7582 | case BUILTIN_NEW: | |
7583 | case BUILTIN_REAL: | |
7584 | case BUILTIN_ALIGNOF: | |
7585 | case BUILTIN_OFFSETOF: | |
7586 | case BUILTIN_SIZEOF: | |
7587 | this->unused_value_error(); | |
4f2138d7 | 7588 | return false; |
a7549a6a | 7589 | |
7590 | case BUILTIN_CLOSE: | |
7591 | case BUILTIN_COPY: | |
1cce762f | 7592 | case BUILTIN_DELETE: |
a7549a6a | 7593 | case BUILTIN_PANIC: |
7594 | case BUILTIN_PRINT: | |
7595 | case BUILTIN_PRINTLN: | |
7596 | case BUILTIN_RECOVER: | |
4f2138d7 | 7597 | return true; |
a7549a6a | 7598 | } |
7599 | } | |
7600 | ||
e440a328 | 7601 | // Return the type. |
7602 | ||
7603 | Type* | |
7604 | Builtin_call_expression::do_type() | |
7605 | { | |
79651b1f | 7606 | if (this->is_error_expression()) |
7607 | return Type::make_error_type(); | |
e440a328 | 7608 | switch (this->code_) |
7609 | { | |
7610 | case BUILTIN_INVALID: | |
7611 | default: | |
79651b1f | 7612 | return Type::make_error_type(); |
e440a328 | 7613 | |
7614 | case BUILTIN_NEW: | |
7615 | case BUILTIN_MAKE: | |
7616 | { | |
7617 | const Expression_list* args = this->args(); | |
7618 | if (args == NULL || args->empty()) | |
7619 | return Type::make_error_type(); | |
7620 | return Type::make_pointer_type(args->front()->type()); | |
7621 | } | |
7622 | ||
7623 | case BUILTIN_CAP: | |
7624 | case BUILTIN_COPY: | |
7625 | case BUILTIN_LEN: | |
7ba86326 | 7626 | return Type::lookup_integer_type("int"); |
7627 | ||
e440a328 | 7628 | case BUILTIN_ALIGNOF: |
7629 | case BUILTIN_OFFSETOF: | |
7630 | case BUILTIN_SIZEOF: | |
7ba86326 | 7631 | return Type::lookup_integer_type("uintptr"); |
e440a328 | 7632 | |
7633 | case BUILTIN_CLOSE: | |
1cce762f | 7634 | case BUILTIN_DELETE: |
e440a328 | 7635 | case BUILTIN_PANIC: |
7636 | case BUILTIN_PRINT: | |
7637 | case BUILTIN_PRINTLN: | |
7638 | return Type::make_void_type(); | |
7639 | ||
e440a328 | 7640 | case BUILTIN_RECOVER: |
823c7e3d | 7641 | return Type::make_empty_interface_type(Linemap::predeclared_location()); |
e440a328 | 7642 | |
7643 | case BUILTIN_APPEND: | |
7644 | { | |
7645 | const Expression_list* args = this->args(); | |
7646 | if (args == NULL || args->empty()) | |
7647 | return Type::make_error_type(); | |
3ff4863b | 7648 | Type *ret = args->front()->type(); |
7649 | if (!ret->is_slice_type()) | |
7650 | return Type::make_error_type(); | |
7651 | return ret; | |
e440a328 | 7652 | } |
7653 | ||
7654 | case BUILTIN_REAL: | |
7655 | case BUILTIN_IMAG: | |
7656 | { | |
7657 | Expression* arg = this->one_arg(); | |
7658 | if (arg == NULL) | |
7659 | return Type::make_error_type(); | |
7660 | Type* t = arg->type(); | |
7661 | if (t->is_abstract()) | |
7662 | t = t->make_non_abstract_type(); | |
7663 | t = Builtin_call_expression::real_imag_type(t); | |
7664 | if (t == NULL) | |
7665 | t = Type::make_error_type(); | |
7666 | return t; | |
7667 | } | |
7668 | ||
48080209 | 7669 | case BUILTIN_COMPLEX: |
e440a328 | 7670 | { |
7671 | const Expression_list* args = this->args(); | |
7672 | if (args == NULL || args->size() != 2) | |
7673 | return Type::make_error_type(); | |
7674 | Type* t = args->front()->type(); | |
7675 | if (t->is_abstract()) | |
7676 | { | |
7677 | t = args->back()->type(); | |
7678 | if (t->is_abstract()) | |
7679 | t = t->make_non_abstract_type(); | |
7680 | } | |
48080209 | 7681 | t = Builtin_call_expression::complex_type(t); |
e440a328 | 7682 | if (t == NULL) |
7683 | t = Type::make_error_type(); | |
7684 | return t; | |
7685 | } | |
7686 | } | |
7687 | } | |
7688 | ||
7689 | // Determine the type. | |
7690 | ||
7691 | void | |
7692 | Builtin_call_expression::do_determine_type(const Type_context* context) | |
7693 | { | |
fb94b0ca | 7694 | if (!this->determining_types()) |
7695 | return; | |
7696 | ||
e440a328 | 7697 | this->fn()->determine_type_no_context(); |
7698 | ||
7699 | const Expression_list* args = this->args(); | |
7700 | ||
7701 | bool is_print; | |
7702 | Type* arg_type = NULL; | |
7703 | switch (this->code_) | |
7704 | { | |
7705 | case BUILTIN_PRINT: | |
7706 | case BUILTIN_PRINTLN: | |
7707 | // Do not force a large integer constant to "int". | |
7708 | is_print = true; | |
7709 | break; | |
7710 | ||
7711 | case BUILTIN_REAL: | |
7712 | case BUILTIN_IMAG: | |
48080209 | 7713 | arg_type = Builtin_call_expression::complex_type(context->type); |
f6bc81e6 | 7714 | if (arg_type == NULL) |
7715 | arg_type = Type::lookup_complex_type("complex128"); | |
e440a328 | 7716 | is_print = false; |
7717 | break; | |
7718 | ||
48080209 | 7719 | case BUILTIN_COMPLEX: |
e440a328 | 7720 | { |
48080209 | 7721 | // For the complex function the type of one operand can |
e440a328 | 7722 | // determine the type of the other, as in a binary expression. |
7723 | arg_type = Builtin_call_expression::real_imag_type(context->type); | |
f6bc81e6 | 7724 | if (arg_type == NULL) |
7725 | arg_type = Type::lookup_float_type("float64"); | |
e440a328 | 7726 | if (args != NULL && args->size() == 2) |
7727 | { | |
7728 | Type* t1 = args->front()->type(); | |
c849bb59 | 7729 | Type* t2 = args->back()->type(); |
e440a328 | 7730 | if (!t1->is_abstract()) |
7731 | arg_type = t1; | |
7732 | else if (!t2->is_abstract()) | |
7733 | arg_type = t2; | |
7734 | } | |
7735 | is_print = false; | |
7736 | } | |
7737 | break; | |
7738 | ||
7739 | default: | |
7740 | is_print = false; | |
7741 | break; | |
7742 | } | |
7743 | ||
7744 | if (args != NULL) | |
7745 | { | |
7746 | for (Expression_list::const_iterator pa = args->begin(); | |
7747 | pa != args->end(); | |
7748 | ++pa) | |
7749 | { | |
7750 | Type_context subcontext; | |
7751 | subcontext.type = arg_type; | |
7752 | ||
7753 | if (is_print) | |
7754 | { | |
7755 | // We want to print large constants, we so can't just | |
7756 | // use the appropriate nonabstract type. Use uint64 for | |
7757 | // an integer if we know it is nonnegative, otherwise | |
7758 | // use int64 for a integer, otherwise use float64 for a | |
7759 | // float or complex128 for a complex. | |
7760 | Type* want_type = NULL; | |
7761 | Type* atype = (*pa)->type(); | |
7762 | if (atype->is_abstract()) | |
7763 | { | |
7764 | if (atype->integer_type() != NULL) | |
7765 | { | |
0c77715b | 7766 | Numeric_constant nc; |
7767 | if (this->numeric_constant_value(&nc)) | |
7768 | { | |
7769 | mpz_t val; | |
7770 | if (nc.to_int(&val)) | |
7771 | { | |
7772 | if (mpz_sgn(val) >= 0) | |
7773 | want_type = Type::lookup_integer_type("uint64"); | |
7774 | mpz_clear(val); | |
7775 | } | |
7776 | } | |
7777 | if (want_type == NULL) | |
e440a328 | 7778 | want_type = Type::lookup_integer_type("int64"); |
e440a328 | 7779 | } |
7780 | else if (atype->float_type() != NULL) | |
7781 | want_type = Type::lookup_float_type("float64"); | |
7782 | else if (atype->complex_type() != NULL) | |
7783 | want_type = Type::lookup_complex_type("complex128"); | |
7784 | else if (atype->is_abstract_string_type()) | |
7785 | want_type = Type::lookup_string_type(); | |
7786 | else if (atype->is_abstract_boolean_type()) | |
7787 | want_type = Type::lookup_bool_type(); | |
7788 | else | |
c3e6f413 | 7789 | go_unreachable(); |
e440a328 | 7790 | subcontext.type = want_type; |
7791 | } | |
7792 | } | |
7793 | ||
7794 | (*pa)->determine_type(&subcontext); | |
7795 | } | |
7796 | } | |
7797 | } | |
7798 | ||
7799 | // If there is exactly one argument, return true. Otherwise give an | |
7800 | // error message and return false. | |
7801 | ||
7802 | bool | |
7803 | Builtin_call_expression::check_one_arg() | |
7804 | { | |
7805 | const Expression_list* args = this->args(); | |
7806 | if (args == NULL || args->size() < 1) | |
7807 | { | |
7808 | this->report_error(_("not enough arguments")); | |
7809 | return false; | |
7810 | } | |
7811 | else if (args->size() > 1) | |
7812 | { | |
7813 | this->report_error(_("too many arguments")); | |
7814 | return false; | |
7815 | } | |
7816 | if (args->front()->is_error_expression() | |
5c13bd80 | 7817 | || args->front()->type()->is_error()) |
e440a328 | 7818 | { |
7819 | this->set_is_error(); | |
7820 | return false; | |
7821 | } | |
7822 | return true; | |
7823 | } | |
7824 | ||
7825 | // Check argument types for a builtin function. | |
7826 | ||
7827 | void | |
7828 | Builtin_call_expression::do_check_types(Gogo*) | |
7829 | { | |
375646ea | 7830 | if (this->is_error_expression()) |
7831 | return; | |
e440a328 | 7832 | switch (this->code_) |
7833 | { | |
7834 | case BUILTIN_INVALID: | |
7835 | case BUILTIN_NEW: | |
7836 | case BUILTIN_MAKE: | |
cd238b8d | 7837 | case BUILTIN_DELETE: |
e440a328 | 7838 | return; |
7839 | ||
7840 | case BUILTIN_LEN: | |
7841 | case BUILTIN_CAP: | |
7842 | { | |
7843 | // The single argument may be either a string or an array or a | |
7844 | // map or a channel, or a pointer to a closed array. | |
7845 | if (this->check_one_arg()) | |
7846 | { | |
7847 | Type* arg_type = this->one_arg()->type(); | |
7848 | if (arg_type->points_to() != NULL | |
7849 | && arg_type->points_to()->array_type() != NULL | |
411eb89e | 7850 | && !arg_type->points_to()->is_slice_type()) |
e440a328 | 7851 | arg_type = arg_type->points_to(); |
7852 | if (this->code_ == BUILTIN_CAP) | |
7853 | { | |
5c13bd80 | 7854 | if (!arg_type->is_error() |
e440a328 | 7855 | && arg_type->array_type() == NULL |
7856 | && arg_type->channel_type() == NULL) | |
7857 | this->report_error(_("argument must be array or slice " | |
7858 | "or channel")); | |
7859 | } | |
7860 | else | |
7861 | { | |
5c13bd80 | 7862 | if (!arg_type->is_error() |
e440a328 | 7863 | && !arg_type->is_string_type() |
7864 | && arg_type->array_type() == NULL | |
7865 | && arg_type->map_type() == NULL | |
7866 | && arg_type->channel_type() == NULL) | |
7867 | this->report_error(_("argument must be string or " | |
7868 | "array or slice or map or channel")); | |
7869 | } | |
7870 | } | |
7871 | } | |
7872 | break; | |
7873 | ||
7874 | case BUILTIN_PRINT: | |
7875 | case BUILTIN_PRINTLN: | |
7876 | { | |
7877 | const Expression_list* args = this->args(); | |
7878 | if (args == NULL) | |
7879 | { | |
7880 | if (this->code_ == BUILTIN_PRINT) | |
7881 | warning_at(this->location(), 0, | |
7882 | "no arguments for builtin function %<%s%>", | |
7883 | (this->code_ == BUILTIN_PRINT | |
7884 | ? "print" | |
7885 | : "println")); | |
7886 | } | |
7887 | else | |
7888 | { | |
7889 | for (Expression_list::const_iterator p = args->begin(); | |
7890 | p != args->end(); | |
7891 | ++p) | |
7892 | { | |
7893 | Type* type = (*p)->type(); | |
5c13bd80 | 7894 | if (type->is_error() |
e440a328 | 7895 | || type->is_string_type() |
7896 | || type->integer_type() != NULL | |
7897 | || type->float_type() != NULL | |
7898 | || type->complex_type() != NULL | |
7899 | || type->is_boolean_type() | |
7900 | || type->points_to() != NULL | |
7901 | || type->interface_type() != NULL | |
7902 | || type->channel_type() != NULL | |
7903 | || type->map_type() != NULL | |
7904 | || type->function_type() != NULL | |
411eb89e | 7905 | || type->is_slice_type()) |
e440a328 | 7906 | ; |
acf8e158 | 7907 | else if ((*p)->is_type_expression()) |
7908 | { | |
7909 | // If this is a type expression it's going to give | |
7910 | // an error anyhow, so we don't need one here. | |
7911 | } | |
e440a328 | 7912 | else |
7913 | this->report_error(_("unsupported argument type to " | |
7914 | "builtin function")); | |
7915 | } | |
7916 | } | |
7917 | } | |
7918 | break; | |
7919 | ||
7920 | case BUILTIN_CLOSE: | |
e440a328 | 7921 | if (this->check_one_arg()) |
7922 | { | |
7923 | if (this->one_arg()->type()->channel_type() == NULL) | |
7924 | this->report_error(_("argument must be channel")); | |
5202d986 | 7925 | else if (!this->one_arg()->type()->channel_type()->may_send()) |
7926 | this->report_error(_("cannot close receive-only channel")); | |
e440a328 | 7927 | } |
7928 | break; | |
7929 | ||
7930 | case BUILTIN_PANIC: | |
7931 | case BUILTIN_SIZEOF: | |
7932 | case BUILTIN_ALIGNOF: | |
7933 | this->check_one_arg(); | |
7934 | break; | |
7935 | ||
7936 | case BUILTIN_RECOVER: | |
6334270b | 7937 | if (this->args() != NULL |
7938 | && !this->args()->empty() | |
7939 | && !this->recover_arg_is_set_) | |
e440a328 | 7940 | this->report_error(_("too many arguments")); |
7941 | break; | |
7942 | ||
7943 | case BUILTIN_OFFSETOF: | |
7944 | if (this->check_one_arg()) | |
7945 | { | |
7946 | Expression* arg = this->one_arg(); | |
7947 | if (arg->field_reference_expression() == NULL) | |
7948 | this->report_error(_("argument must be a field reference")); | |
7949 | } | |
7950 | break; | |
7951 | ||
7952 | case BUILTIN_COPY: | |
7953 | { | |
7954 | const Expression_list* args = this->args(); | |
7955 | if (args == NULL || args->size() < 2) | |
7956 | { | |
7957 | this->report_error(_("not enough arguments")); | |
7958 | break; | |
7959 | } | |
7960 | else if (args->size() > 2) | |
7961 | { | |
7962 | this->report_error(_("too many arguments")); | |
7963 | break; | |
7964 | } | |
7965 | Type* arg1_type = args->front()->type(); | |
7966 | Type* arg2_type = args->back()->type(); | |
5c13bd80 | 7967 | if (arg1_type->is_error() || arg2_type->is_error()) |
6bebb39d | 7968 | { |
7969 | this->set_is_error(); | |
7970 | break; | |
7971 | } | |
e440a328 | 7972 | |
7973 | Type* e1; | |
411eb89e | 7974 | if (arg1_type->is_slice_type()) |
e440a328 | 7975 | e1 = arg1_type->array_type()->element_type(); |
7976 | else | |
7977 | { | |
7978 | this->report_error(_("left argument must be a slice")); | |
7979 | break; | |
7980 | } | |
7981 | ||
411eb89e | 7982 | if (arg2_type->is_slice_type()) |
60963afd | 7983 | { |
7984 | Type* e2 = arg2_type->array_type()->element_type(); | |
7985 | if (!Type::are_identical(e1, e2, true, NULL)) | |
7986 | this->report_error(_("element types must be the same")); | |
7987 | } | |
e440a328 | 7988 | else if (arg2_type->is_string_type()) |
e440a328 | 7989 | { |
60963afd | 7990 | if (e1->integer_type() == NULL || !e1->integer_type()->is_byte()) |
7991 | this->report_error(_("first argument must be []byte")); | |
e440a328 | 7992 | } |
60963afd | 7993 | else |
7994 | this->report_error(_("second argument must be slice or string")); | |
e440a328 | 7995 | } |
7996 | break; | |
7997 | ||
7998 | case BUILTIN_APPEND: | |
7999 | { | |
8000 | const Expression_list* args = this->args(); | |
b0d311a1 | 8001 | if (args == NULL || args->size() < 2) |
e440a328 | 8002 | { |
8003 | this->report_error(_("not enough arguments")); | |
8004 | break; | |
8005 | } | |
0b7755ec | 8006 | if (args->size() > 2) |
8007 | { | |
8008 | this->report_error(_("too many arguments")); | |
8009 | break; | |
8010 | } | |
cd238b8d | 8011 | if (args->front()->type()->is_error() |
8012 | || args->back()->type()->is_error()) | |
6bebb39d | 8013 | { |
8014 | this->set_is_error(); | |
8015 | break; | |
8016 | } | |
cd238b8d | 8017 | |
8018 | Array_type* at = args->front()->type()->array_type(); | |
8019 | Type* e = at->element_type(); | |
4fd4fcf4 | 8020 | |
8021 | // The language permits appending a string to a []byte, as a | |
8022 | // special case. | |
8023 | if (args->back()->type()->is_string_type()) | |
8024 | { | |
60963afd | 8025 | if (e->integer_type() != NULL && e->integer_type()->is_byte()) |
4fd4fcf4 | 8026 | break; |
8027 | } | |
8028 | ||
19fd40c3 | 8029 | // The language says that the second argument must be |
8030 | // assignable to a slice of the element type of the first | |
8031 | // argument. We already know the first argument is a slice | |
8032 | // type. | |
cd238b8d | 8033 | Type* arg2_type = Type::make_array_type(e, NULL); |
e440a328 | 8034 | std::string reason; |
19fd40c3 | 8035 | if (!Type::are_assignable(arg2_type, args->back()->type(), &reason)) |
e440a328 | 8036 | { |
8037 | if (reason.empty()) | |
19fd40c3 | 8038 | this->report_error(_("argument 2 has invalid type")); |
e440a328 | 8039 | else |
8040 | { | |
19fd40c3 | 8041 | error_at(this->location(), "argument 2 has invalid type (%s)", |
e440a328 | 8042 | reason.c_str()); |
8043 | this->set_is_error(); | |
8044 | } | |
8045 | } | |
8046 | break; | |
8047 | } | |
8048 | ||
8049 | case BUILTIN_REAL: | |
8050 | case BUILTIN_IMAG: | |
8051 | if (this->check_one_arg()) | |
8052 | { | |
8053 | if (this->one_arg()->type()->complex_type() == NULL) | |
8054 | this->report_error(_("argument must have complex type")); | |
8055 | } | |
8056 | break; | |
8057 | ||
48080209 | 8058 | case BUILTIN_COMPLEX: |
e440a328 | 8059 | { |
8060 | const Expression_list* args = this->args(); | |
8061 | if (args == NULL || args->size() < 2) | |
8062 | this->report_error(_("not enough arguments")); | |
8063 | else if (args->size() > 2) | |
8064 | this->report_error(_("too many arguments")); | |
8065 | else if (args->front()->is_error_expression() | |
5c13bd80 | 8066 | || args->front()->type()->is_error() |
e440a328 | 8067 | || args->back()->is_error_expression() |
5c13bd80 | 8068 | || args->back()->type()->is_error()) |
e440a328 | 8069 | this->set_is_error(); |
8070 | else if (!Type::are_identical(args->front()->type(), | |
07ba8be5 | 8071 | args->back()->type(), true, NULL)) |
48080209 | 8072 | this->report_error(_("complex arguments must have identical types")); |
e440a328 | 8073 | else if (args->front()->type()->float_type() == NULL) |
48080209 | 8074 | this->report_error(_("complex arguments must have " |
e440a328 | 8075 | "floating-point type")); |
8076 | } | |
8077 | break; | |
8078 | ||
8079 | default: | |
c3e6f413 | 8080 | go_unreachable(); |
e440a328 | 8081 | } |
8082 | } | |
8083 | ||
72666aed | 8084 | Expression* |
8085 | Builtin_call_expression::do_copy() | |
8086 | { | |
8087 | Call_expression* bce = | |
8088 | new Builtin_call_expression(this->gogo_, this->fn()->copy(), | |
da244e59 | 8089 | (this->args() == NULL |
8090 | ? NULL | |
8091 | : this->args()->copy()), | |
72666aed | 8092 | this->is_varargs(), |
8093 | this->location()); | |
8094 | ||
8095 | if (this->varargs_are_lowered()) | |
8096 | bce->set_varargs_are_lowered(); | |
8097 | return bce; | |
8098 | } | |
8099 | ||
ea664253 | 8100 | // Return the backend representation for a builtin function. |
e440a328 | 8101 | |
ea664253 | 8102 | Bexpression* |
8103 | Builtin_call_expression::do_get_backend(Translate_context* context) | |
e440a328 | 8104 | { |
8105 | Gogo* gogo = context->gogo(); | |
b13c66cd | 8106 | Location location = this->location(); |
a0d8874e | 8107 | |
8108 | if (this->is_erroneous_call()) | |
8109 | { | |
8110 | go_assert(saw_errors()); | |
8111 | return gogo->backend()->error_expression(); | |
8112 | } | |
8113 | ||
e440a328 | 8114 | switch (this->code_) |
8115 | { | |
8116 | case BUILTIN_INVALID: | |
8117 | case BUILTIN_NEW: | |
8118 | case BUILTIN_MAKE: | |
c3e6f413 | 8119 | go_unreachable(); |
e440a328 | 8120 | |
8121 | case BUILTIN_LEN: | |
8122 | case BUILTIN_CAP: | |
8123 | { | |
8124 | const Expression_list* args = this->args(); | |
c484d925 | 8125 | go_assert(args != NULL && args->size() == 1); |
2c809f8f | 8126 | Expression* arg = args->front(); |
e440a328 | 8127 | Type* arg_type = arg->type(); |
0f914071 | 8128 | |
8129 | if (this->seen_) | |
8130 | { | |
c484d925 | 8131 | go_assert(saw_errors()); |
ea664253 | 8132 | return context->backend()->error_expression(); |
0f914071 | 8133 | } |
8134 | this->seen_ = true; | |
0f914071 | 8135 | this->seen_ = false; |
e440a328 | 8136 | if (arg_type->points_to() != NULL) |
8137 | { | |
8138 | arg_type = arg_type->points_to(); | |
c484d925 | 8139 | go_assert(arg_type->array_type() != NULL |
411eb89e | 8140 | && !arg_type->is_slice_type()); |
2c809f8f | 8141 | arg = Expression::make_unary(OPERATOR_MULT, arg, location); |
e440a328 | 8142 | } |
8143 | ||
1b1f2abf | 8144 | Type* int_type = Type::lookup_integer_type("int"); |
2c809f8f | 8145 | Expression* val; |
e440a328 | 8146 | if (this->code_ == BUILTIN_LEN) |
8147 | { | |
8148 | if (arg_type->is_string_type()) | |
2c809f8f | 8149 | val = Expression::make_string_info(arg, STRING_INFO_LENGTH, |
8150 | location); | |
e440a328 | 8151 | else if (arg_type->array_type() != NULL) |
0f914071 | 8152 | { |
8153 | if (this->seen_) | |
8154 | { | |
c484d925 | 8155 | go_assert(saw_errors()); |
ea664253 | 8156 | return context->backend()->error_expression(); |
0f914071 | 8157 | } |
8158 | this->seen_ = true; | |
2c809f8f | 8159 | val = arg_type->array_type()->get_length(gogo, arg); |
0f914071 | 8160 | this->seen_ = false; |
8161 | } | |
e440a328 | 8162 | else if (arg_type->map_type() != NULL) |
2c809f8f | 8163 | val = Runtime::make_call(Runtime::MAP_LEN, location, 1, arg); |
e440a328 | 8164 | else if (arg_type->channel_type() != NULL) |
2c809f8f | 8165 | val = Runtime::make_call(Runtime::CHAN_LEN, location, 1, arg); |
e440a328 | 8166 | else |
c3e6f413 | 8167 | go_unreachable(); |
e440a328 | 8168 | } |
8169 | else | |
8170 | { | |
8171 | if (arg_type->array_type() != NULL) | |
0f914071 | 8172 | { |
8173 | if (this->seen_) | |
8174 | { | |
c484d925 | 8175 | go_assert(saw_errors()); |
ea664253 | 8176 | return context->backend()->error_expression(); |
0f914071 | 8177 | } |
8178 | this->seen_ = true; | |
2c809f8f | 8179 | val = arg_type->array_type()->get_capacity(gogo, arg); |
0f914071 | 8180 | this->seen_ = false; |
8181 | } | |
e440a328 | 8182 | else if (arg_type->channel_type() != NULL) |
2c809f8f | 8183 | val = Runtime::make_call(Runtime::CHAN_CAP, location, 1, arg); |
e440a328 | 8184 | else |
c3e6f413 | 8185 | go_unreachable(); |
e440a328 | 8186 | } |
8187 | ||
2c809f8f | 8188 | return Expression::make_cast(int_type, val, |
ea664253 | 8189 | location)->get_backend(context); |
e440a328 | 8190 | } |
8191 | ||
8192 | case BUILTIN_PRINT: | |
8193 | case BUILTIN_PRINTLN: | |
8194 | { | |
8195 | const bool is_ln = this->code_ == BUILTIN_PRINTLN; | |
2c809f8f | 8196 | Expression* print_stmts = NULL; |
e440a328 | 8197 | |
8198 | const Expression_list* call_args = this->args(); | |
8199 | if (call_args != NULL) | |
8200 | { | |
8201 | for (Expression_list::const_iterator p = call_args->begin(); | |
8202 | p != call_args->end(); | |
8203 | ++p) | |
8204 | { | |
8205 | if (is_ln && p != call_args->begin()) | |
8206 | { | |
2c809f8f | 8207 | Expression* print_space = |
8208 | Runtime::make_call(Runtime::PRINT_SPACE, | |
8209 | this->location(), 0); | |
e440a328 | 8210 | |
2c809f8f | 8211 | print_stmts = |
8212 | Expression::make_compound(print_stmts, print_space, | |
8213 | location); | |
8214 | } | |
e440a328 | 8215 | |
2c809f8f | 8216 | Expression* arg = *p; |
8217 | Type* type = arg->type(); | |
8218 | Runtime::Function code; | |
e440a328 | 8219 | if (type->is_string_type()) |
2c809f8f | 8220 | code = Runtime::PRINT_STRING; |
e440a328 | 8221 | else if (type->integer_type() != NULL |
8222 | && type->integer_type()->is_unsigned()) | |
8223 | { | |
e440a328 | 8224 | Type* itype = Type::lookup_integer_type("uint64"); |
2c809f8f | 8225 | arg = Expression::make_cast(itype, arg, location); |
8226 | code = Runtime::PRINT_UINT64; | |
e440a328 | 8227 | } |
8228 | else if (type->integer_type() != NULL) | |
8229 | { | |
e440a328 | 8230 | Type* itype = Type::lookup_integer_type("int64"); |
2c809f8f | 8231 | arg = Expression::make_cast(itype, arg, location); |
8232 | code = Runtime::PRINT_INT64; | |
e440a328 | 8233 | } |
8234 | else if (type->float_type() != NULL) | |
8235 | { | |
2c809f8f | 8236 | Type* dtype = Type::lookup_float_type("float64"); |
8237 | arg = Expression::make_cast(dtype, arg, location); | |
8238 | code = Runtime::PRINT_DOUBLE; | |
e440a328 | 8239 | } |
8240 | else if (type->complex_type() != NULL) | |
8241 | { | |
2c809f8f | 8242 | Type* ctype = Type::lookup_complex_type("complex128"); |
8243 | arg = Expression::make_cast(ctype, arg, location); | |
8244 | code = Runtime::PRINT_COMPLEX; | |
e440a328 | 8245 | } |
8246 | else if (type->is_boolean_type()) | |
2c809f8f | 8247 | code = Runtime::PRINT_BOOL; |
e440a328 | 8248 | else if (type->points_to() != NULL |
8249 | || type->channel_type() != NULL | |
8250 | || type->map_type() != NULL | |
8251 | || type->function_type() != NULL) | |
8252 | { | |
2c809f8f | 8253 | arg = Expression::make_cast(type, arg, location); |
8254 | code = Runtime::PRINT_POINTER; | |
e440a328 | 8255 | } |
8256 | else if (type->interface_type() != NULL) | |
8257 | { | |
8258 | if (type->interface_type()->is_empty()) | |
2c809f8f | 8259 | code = Runtime::PRINT_EMPTY_INTERFACE; |
e440a328 | 8260 | else |
2c809f8f | 8261 | code = Runtime::PRINT_INTERFACE; |
e440a328 | 8262 | } |
411eb89e | 8263 | else if (type->is_slice_type()) |
2c809f8f | 8264 | code = Runtime::PRINT_SLICE; |
e440a328 | 8265 | else |
cd238b8d | 8266 | { |
8267 | go_assert(saw_errors()); | |
ea664253 | 8268 | return context->backend()->error_expression(); |
cd238b8d | 8269 | } |
e440a328 | 8270 | |
2c809f8f | 8271 | Expression* call = Runtime::make_call(code, location, 1, arg); |
8272 | if (print_stmts == NULL) | |
8273 | print_stmts = call; | |
8274 | else | |
8275 | print_stmts = Expression::make_compound(print_stmts, call, | |
8276 | location); | |
e440a328 | 8277 | } |
8278 | } | |
8279 | ||
8280 | if (is_ln) | |
8281 | { | |
2c809f8f | 8282 | Expression* print_nl = |
8283 | Runtime::make_call(Runtime::PRINT_NL, location, 0); | |
8284 | if (print_stmts == NULL) | |
8285 | print_stmts = print_nl; | |
8286 | else | |
8287 | print_stmts = Expression::make_compound(print_stmts, print_nl, | |
8288 | location); | |
e440a328 | 8289 | } |
8290 | ||
32e3ff69 | 8291 | // There aren't any arguments to the print builtin. The compiler |
8292 | // issues a warning for this so we should avoid getting the backend | |
8293 | // representation for this call. Instead, perform a no-op. | |
8294 | if (print_stmts == NULL) | |
8295 | return context->backend()->boolean_constant_expression(false); | |
8296 | ||
ea664253 | 8297 | return print_stmts->get_backend(context); |
e440a328 | 8298 | } |
8299 | ||
8300 | case BUILTIN_PANIC: | |
8301 | { | |
8302 | const Expression_list* args = this->args(); | |
c484d925 | 8303 | go_assert(args != NULL && args->size() == 1); |
e440a328 | 8304 | Expression* arg = args->front(); |
b13c66cd | 8305 | Type *empty = |
823c7e3d | 8306 | Type::make_empty_interface_type(Linemap::predeclared_location()); |
2c809f8f | 8307 | arg = Expression::convert_for_assignment(gogo, empty, arg, location); |
8308 | ||
8309 | Expression* panic = | |
8310 | Runtime::make_call(Runtime::PANIC, location, 1, arg); | |
ea664253 | 8311 | return panic->get_backend(context); |
e440a328 | 8312 | } |
8313 | ||
8314 | case BUILTIN_RECOVER: | |
8315 | { | |
8316 | // The argument is set when building recover thunks. It's a | |
8317 | // boolean value which is true if we can recover a value now. | |
8318 | const Expression_list* args = this->args(); | |
c484d925 | 8319 | go_assert(args != NULL && args->size() == 1); |
e440a328 | 8320 | Expression* arg = args->front(); |
b13c66cd | 8321 | Type *empty = |
823c7e3d | 8322 | Type::make_empty_interface_type(Linemap::predeclared_location()); |
e440a328 | 8323 | |
e440a328 | 8324 | Expression* nil = Expression::make_nil(location); |
2c809f8f | 8325 | nil = Expression::convert_for_assignment(gogo, empty, nil, location); |
e440a328 | 8326 | |
8327 | // We need to handle a deferred call to recover specially, | |
8328 | // because it changes whether it can recover a panic or not. | |
8329 | // See test7 in test/recover1.go. | |
2c809f8f | 8330 | Expression* recover = Runtime::make_call((this->is_deferred() |
8331 | ? Runtime::DEFERRED_RECOVER | |
8332 | : Runtime::RECOVER), | |
8333 | location, 0); | |
8334 | Expression* cond = | |
8335 | Expression::make_conditional(arg, recover, nil, location); | |
ea664253 | 8336 | return cond->get_backend(context); |
e440a328 | 8337 | } |
8338 | ||
8339 | case BUILTIN_CLOSE: | |
e440a328 | 8340 | { |
8341 | const Expression_list* args = this->args(); | |
c484d925 | 8342 | go_assert(args != NULL && args->size() == 1); |
e440a328 | 8343 | Expression* arg = args->front(); |
2c809f8f | 8344 | Expression* close = Runtime::make_call(Runtime::CLOSE, location, |
8345 | 1, arg); | |
ea664253 | 8346 | return close->get_backend(context); |
e440a328 | 8347 | } |
8348 | ||
8349 | case BUILTIN_SIZEOF: | |
8350 | case BUILTIN_OFFSETOF: | |
8351 | case BUILTIN_ALIGNOF: | |
8352 | { | |
0c77715b | 8353 | Numeric_constant nc; |
8354 | unsigned long val; | |
8355 | if (!this->numeric_constant_value(&nc) | |
8356 | || nc.to_unsigned_long(&val) != Numeric_constant::NC_UL_VALID) | |
7f1d9abd | 8357 | { |
c484d925 | 8358 | go_assert(saw_errors()); |
ea664253 | 8359 | return context->backend()->error_expression(); |
7f1d9abd | 8360 | } |
7ba86326 | 8361 | Type* uintptr_type = Type::lookup_integer_type("uintptr"); |
2c809f8f | 8362 | mpz_t ival; |
8363 | nc.get_int(&ival); | |
8364 | Expression* int_cst = | |
e67508fa | 8365 | Expression::make_integer_z(&ival, uintptr_type, location); |
2c809f8f | 8366 | mpz_clear(ival); |
ea664253 | 8367 | return int_cst->get_backend(context); |
e440a328 | 8368 | } |
8369 | ||
8370 | case BUILTIN_COPY: | |
8371 | { | |
8372 | const Expression_list* args = this->args(); | |
c484d925 | 8373 | go_assert(args != NULL && args->size() == 2); |
e440a328 | 8374 | Expression* arg1 = args->front(); |
8375 | Expression* arg2 = args->back(); | |
8376 | ||
e440a328 | 8377 | Type* arg1_type = arg1->type(); |
8378 | Array_type* at = arg1_type->array_type(); | |
35a54f17 | 8379 | go_assert(arg1->is_variable()); |
2c809f8f | 8380 | Expression* arg1_val = at->get_value_pointer(gogo, arg1); |
8381 | Expression* arg1_len = at->get_length(gogo, arg1); | |
e440a328 | 8382 | |
8383 | Type* arg2_type = arg2->type(); | |
2c809f8f | 8384 | go_assert(arg2->is_variable()); |
8385 | Expression* arg2_val; | |
8386 | Expression* arg2_len; | |
411eb89e | 8387 | if (arg2_type->is_slice_type()) |
e440a328 | 8388 | { |
8389 | at = arg2_type->array_type(); | |
2c809f8f | 8390 | arg2_val = at->get_value_pointer(gogo, arg2); |
8391 | arg2_len = at->get_length(gogo, arg2); | |
e440a328 | 8392 | } |
8393 | else | |
8394 | { | |
2c809f8f | 8395 | go_assert(arg2->is_variable()); |
8396 | arg2_val = Expression::make_string_info(arg2, STRING_INFO_DATA, | |
8397 | location); | |
8398 | arg2_len = Expression::make_string_info(arg2, STRING_INFO_LENGTH, | |
8399 | location); | |
e440a328 | 8400 | } |
2c809f8f | 8401 | Expression* cond = |
8402 | Expression::make_binary(OPERATOR_LT, arg1_len, arg2_len, location); | |
8403 | Expression* length = | |
8404 | Expression::make_conditional(cond, arg1_len, arg2_len, location); | |
e440a328 | 8405 | |
8406 | Type* element_type = at->element_type(); | |
2a305b85 | 8407 | int64_t element_size; |
8408 | bool ok = element_type->backend_type_size(gogo, &element_size); | |
8409 | if (!ok) | |
8410 | { | |
8411 | go_assert(saw_errors()); | |
8412 | return gogo->backend()->error_expression(); | |
8413 | } | |
8414 | ||
3f378015 | 8415 | Expression* size_expr = Expression::make_integer_int64(element_size, |
8416 | length->type(), | |
8417 | location); | |
2c809f8f | 8418 | Expression* bytecount = |
8419 | Expression::make_binary(OPERATOR_MULT, size_expr, length, location); | |
8420 | Expression* copy = Runtime::make_call(Runtime::COPY, location, 3, | |
8421 | arg1_val, arg2_val, bytecount); | |
8422 | ||
8423 | Expression* compound = Expression::make_compound(copy, length, location); | |
ea664253 | 8424 | return compound->get_backend(context); |
e440a328 | 8425 | } |
8426 | ||
8427 | case BUILTIN_APPEND: | |
8428 | { | |
8429 | const Expression_list* args = this->args(); | |
c484d925 | 8430 | go_assert(args != NULL && args->size() == 2); |
e440a328 | 8431 | Expression* arg1 = args->front(); |
8432 | Expression* arg2 = args->back(); | |
8433 | ||
9d44fbe3 | 8434 | Array_type* at = arg1->type()->array_type(); |
4fd4fcf4 | 8435 | Type* element_type = at->element_type()->forwarded(); |
9d44fbe3 | 8436 | |
2c809f8f | 8437 | go_assert(arg2->is_variable()); |
8438 | Expression* arg2_val; | |
8439 | Expression* arg2_len; | |
3f378015 | 8440 | int64_t size; |
4fd4fcf4 | 8441 | if (arg2->type()->is_string_type() |
60963afd | 8442 | && element_type->integer_type() != NULL |
8443 | && element_type->integer_type()->is_byte()) | |
4fd4fcf4 | 8444 | { |
2c809f8f | 8445 | arg2_val = Expression::make_string_info(arg2, STRING_INFO_DATA, |
8446 | location); | |
8447 | arg2_len = Expression::make_string_info(arg2, STRING_INFO_LENGTH, | |
8448 | location); | |
e67508fa | 8449 | size = 1; |
4fd4fcf4 | 8450 | } |
8451 | else | |
8452 | { | |
2c809f8f | 8453 | arg2_val = at->get_value_pointer(gogo, arg2); |
8454 | arg2_len = at->get_length(gogo, arg2); | |
2a305b85 | 8455 | bool ok = element_type->backend_type_size(gogo, &size); |
8456 | if (!ok) | |
8457 | { | |
8458 | go_assert(saw_errors()); | |
8459 | return gogo->backend()->error_expression(); | |
8460 | } | |
4fd4fcf4 | 8461 | } |
2c809f8f | 8462 | Expression* element_size = |
3f378015 | 8463 | Expression::make_integer_int64(size, NULL, location); |
2c809f8f | 8464 | |
8465 | Expression* append = Runtime::make_call(Runtime::APPEND, location, 4, | |
8466 | arg1, arg2_val, arg2_len, | |
8467 | element_size); | |
8468 | append = Expression::make_unsafe_cast(arg1->type(), append, location); | |
ea664253 | 8469 | return append->get_backend(context); |
e440a328 | 8470 | } |
8471 | ||
8472 | case BUILTIN_REAL: | |
8473 | case BUILTIN_IMAG: | |
8474 | { | |
8475 | const Expression_list* args = this->args(); | |
c484d925 | 8476 | go_assert(args != NULL && args->size() == 1); |
2c809f8f | 8477 | |
8478 | Bexpression* ret; | |
ea664253 | 8479 | Bexpression* bcomplex = args->front()->get_backend(context); |
2c809f8f | 8480 | if (this->code_ == BUILTIN_REAL) |
8481 | ret = gogo->backend()->real_part_expression(bcomplex, location); | |
8482 | else | |
8483 | ret = gogo->backend()->imag_part_expression(bcomplex, location); | |
ea664253 | 8484 | return ret; |
e440a328 | 8485 | } |
8486 | ||
48080209 | 8487 | case BUILTIN_COMPLEX: |
e440a328 | 8488 | { |
8489 | const Expression_list* args = this->args(); | |
c484d925 | 8490 | go_assert(args != NULL && args->size() == 2); |
ea664253 | 8491 | Bexpression* breal = args->front()->get_backend(context); |
8492 | Bexpression* bimag = args->back()->get_backend(context); | |
8493 | return gogo->backend()->complex_expression(breal, bimag, location); | |
e440a328 | 8494 | } |
8495 | ||
8496 | default: | |
c3e6f413 | 8497 | go_unreachable(); |
e440a328 | 8498 | } |
8499 | } | |
8500 | ||
8501 | // We have to support exporting a builtin call expression, because | |
8502 | // code can set a constant to the result of a builtin expression. | |
8503 | ||
8504 | void | |
8505 | Builtin_call_expression::do_export(Export* exp) const | |
8506 | { | |
0c77715b | 8507 | Numeric_constant nc; |
8508 | if (!this->numeric_constant_value(&nc)) | |
8509 | { | |
8510 | error_at(this->location(), "value is not constant"); | |
8511 | return; | |
8512 | } | |
e440a328 | 8513 | |
0c77715b | 8514 | if (nc.is_int()) |
e440a328 | 8515 | { |
0c77715b | 8516 | mpz_t val; |
8517 | nc.get_int(&val); | |
e440a328 | 8518 | Integer_expression::export_integer(exp, val); |
0c77715b | 8519 | mpz_clear(val); |
e440a328 | 8520 | } |
0c77715b | 8521 | else if (nc.is_float()) |
e440a328 | 8522 | { |
8523 | mpfr_t fval; | |
0c77715b | 8524 | nc.get_float(&fval); |
8525 | Float_expression::export_float(exp, fval); | |
e440a328 | 8526 | mpfr_clear(fval); |
8527 | } | |
0c77715b | 8528 | else if (nc.is_complex()) |
e440a328 | 8529 | { |
fcbea5e4 | 8530 | mpc_t cval; |
8531 | nc.get_complex(&cval); | |
8532 | Complex_expression::export_complex(exp, cval); | |
8533 | mpc_clear(cval); | |
e440a328 | 8534 | } |
0c77715b | 8535 | else |
8536 | go_unreachable(); | |
e440a328 | 8537 | |
8538 | // A trailing space lets us reliably identify the end of the number. | |
8539 | exp->write_c_string(" "); | |
8540 | } | |
8541 | ||
8542 | // Class Call_expression. | |
8543 | ||
8381eda7 | 8544 | // A Go function can be viewed in a couple of different ways. The |
8545 | // code of a Go function becomes a backend function with parameters | |
8546 | // whose types are simply the backend representation of the Go types. | |
8547 | // If there are multiple results, they are returned as a backend | |
8548 | // struct. | |
8549 | ||
8550 | // However, when Go code refers to a function other than simply | |
8551 | // calling it, the backend type of that function is actually a struct. | |
8552 | // The first field of the struct points to the Go function code | |
8553 | // (sometimes a wrapper as described below). The remaining fields | |
8554 | // hold addresses of closed-over variables. This struct is called a | |
8555 | // closure. | |
8556 | ||
8557 | // There are a few cases to consider. | |
8558 | ||
8559 | // A direct function call of a known function in package scope. In | |
8560 | // this case there are no closed-over variables, and we know the name | |
8561 | // of the function code. We can simply produce a backend call to the | |
8562 | // function directly, and not worry about the closure. | |
8563 | ||
8564 | // A direct function call of a known function literal. In this case | |
8565 | // we know the function code and we know the closure. We generate the | |
8566 | // function code such that it expects an additional final argument of | |
8567 | // the closure type. We pass the closure as the last argument, after | |
8568 | // the other arguments. | |
8569 | ||
8570 | // An indirect function call. In this case we have a closure. We | |
8571 | // load the pointer to the function code from the first field of the | |
8572 | // closure. We pass the address of the closure as the last argument. | |
8573 | ||
8574 | // A call to a method of an interface. Type methods are always at | |
8575 | // package scope, so we call the function directly, and don't worry | |
8576 | // about the closure. | |
8577 | ||
8578 | // This means that for a function at package scope we have two cases. | |
8579 | // One is the direct call, which has no closure. The other is the | |
8580 | // indirect call, which does have a closure. We can't simply ignore | |
8581 | // the closure, even though it is the last argument, because that will | |
8582 | // fail on targets where the function pops its arguments. So when | |
8583 | // generating a closure for a package-scope function we set the | |
8584 | // function code pointer in the closure to point to a wrapper | |
8585 | // function. This wrapper function accepts a final argument that | |
8586 | // points to the closure, ignores it, and calls the real function as a | |
8587 | // direct function call. This wrapper will normally be efficient, and | |
8588 | // can often simply be a tail call to the real function. | |
8589 | ||
8590 | // We don't use GCC's static chain pointer because 1) we don't need | |
8591 | // it; 2) GCC only permits using a static chain to call a known | |
8592 | // function, so we can't use it for an indirect call anyhow. Since we | |
8593 | // can't use it for an indirect call, we may as well not worry about | |
8594 | // using it for a direct call either. | |
8595 | ||
8596 | // We pass the closure last rather than first because it means that | |
8597 | // the function wrapper we put into a closure for a package-scope | |
8598 | // function can normally just be a tail call to the real function. | |
8599 | ||
8600 | // For method expressions we generate a wrapper that loads the | |
8601 | // receiver from the closure and then calls the method. This | |
8602 | // unfortunately forces reshuffling the arguments, since there is a | |
8603 | // new first argument, but we can't avoid reshuffling either for | |
8604 | // method expressions or for indirect calls of package-scope | |
8605 | // functions, and since the latter are more common we reshuffle for | |
8606 | // method expressions. | |
8607 | ||
8608 | // Note that the Go code retains the Go types. The extra final | |
8609 | // argument only appears when we convert to the backend | |
8610 | // representation. | |
8611 | ||
e440a328 | 8612 | // Traversal. |
8613 | ||
8614 | int | |
8615 | Call_expression::do_traverse(Traverse* traverse) | |
8616 | { | |
0c0dacab | 8617 | // If we are calling a function in a different package that returns |
8618 | // an unnamed type, this may be the only chance we get to traverse | |
8619 | // that type. We don't traverse this->type_ because it may be a | |
8620 | // Call_multiple_result_type that will just lead back here. | |
8621 | if (this->type_ != NULL && !this->type_->is_error_type()) | |
8622 | { | |
8623 | Function_type *fntype = this->get_function_type(); | |
8624 | if (fntype != NULL && Type::traverse(fntype, traverse) == TRAVERSE_EXIT) | |
8625 | return TRAVERSE_EXIT; | |
8626 | } | |
e440a328 | 8627 | if (Expression::traverse(&this->fn_, traverse) == TRAVERSE_EXIT) |
8628 | return TRAVERSE_EXIT; | |
8629 | if (this->args_ != NULL) | |
8630 | { | |
8631 | if (this->args_->traverse(traverse) == TRAVERSE_EXIT) | |
8632 | return TRAVERSE_EXIT; | |
8633 | } | |
8634 | return TRAVERSE_CONTINUE; | |
8635 | } | |
8636 | ||
8637 | // Lower a call statement. | |
8638 | ||
8639 | Expression* | |
ceeb4318 | 8640 | Call_expression::do_lower(Gogo* gogo, Named_object* function, |
8641 | Statement_inserter* inserter, int) | |
e440a328 | 8642 | { |
b13c66cd | 8643 | Location loc = this->location(); |
09ea332d | 8644 | |
ceeb4318 | 8645 | // A type cast can look like a function call. |
e440a328 | 8646 | if (this->fn_->is_type_expression() |
8647 | && this->args_ != NULL | |
8648 | && this->args_->size() == 1) | |
8649 | return Expression::make_cast(this->fn_->type(), this->args_->front(), | |
09ea332d | 8650 | loc); |
e440a328 | 8651 | |
88f06749 | 8652 | // Because do_type will return an error type and thus prevent future |
8653 | // errors, check for that case now to ensure that the error gets | |
8654 | // reported. | |
37448b10 | 8655 | Function_type* fntype = this->get_function_type(); |
8656 | if (fntype == NULL) | |
88f06749 | 8657 | { |
8658 | if (!this->fn_->type()->is_error()) | |
8659 | this->report_error(_("expected function")); | |
5f1045b5 | 8660 | this->set_is_error(); |
8661 | return this; | |
88f06749 | 8662 | } |
8663 | ||
e440a328 | 8664 | // Handle an argument which is a call to a function which returns |
8665 | // multiple results. | |
8666 | if (this->args_ != NULL | |
8667 | && this->args_->size() == 1 | |
37448b10 | 8668 | && this->args_->front()->call_expression() != NULL) |
e440a328 | 8669 | { |
e440a328 | 8670 | size_t rc = this->args_->front()->call_expression()->result_count(); |
8671 | if (rc > 1 | |
37448b10 | 8672 | && ((fntype->parameters() != NULL |
8673 | && (fntype->parameters()->size() == rc | |
8674 | || (fntype->is_varargs() | |
8675 | && fntype->parameters()->size() - 1 <= rc))) | |
8676 | || fntype->is_builtin())) | |
e440a328 | 8677 | { |
8678 | Call_expression* call = this->args_->front()->call_expression(); | |
e90ecd2d | 8679 | call->set_is_multi_value_arg(); |
c33af8e4 | 8680 | if (this->is_varargs_) |
8681 | { | |
8682 | // It is not clear which result of a multiple result call | |
8683 | // the ellipsis operator should be applied to. If we unpack the | |
8684 | // the call into its individual results here, the ellipsis will be | |
8685 | // applied to the last result. | |
8686 | error_at(call->location(), | |
8687 | _("multiple-value argument in single-value context")); | |
8688 | return Expression::make_error(call->location()); | |
8689 | } | |
8690 | ||
e440a328 | 8691 | Expression_list* args = new Expression_list; |
8692 | for (size_t i = 0; i < rc; ++i) | |
8693 | args->push_back(Expression::make_call_result(call, i)); | |
8694 | // We can't return a new call expression here, because this | |
42535814 | 8695 | // one may be referenced by Call_result expressions. We |
8696 | // also can't delete the old arguments, because we may still | |
8697 | // traverse them somewhere up the call stack. FIXME. | |
e440a328 | 8698 | this->args_ = args; |
8699 | } | |
8700 | } | |
8701 | ||
37448b10 | 8702 | // Recognize a call to a builtin function. |
8703 | if (fntype->is_builtin()) | |
8704 | return new Builtin_call_expression(gogo, this->fn_, this->args_, | |
8705 | this->is_varargs_, loc); | |
8706 | ||
ceeb4318 | 8707 | // If this call returns multiple results, create a temporary |
8708 | // variable for each result. | |
8709 | size_t rc = this->result_count(); | |
8710 | if (rc > 1 && this->results_ == NULL) | |
8711 | { | |
8712 | std::vector<Temporary_statement*>* temps = | |
8713 | new std::vector<Temporary_statement*>; | |
8714 | temps->reserve(rc); | |
37448b10 | 8715 | const Typed_identifier_list* results = fntype->results(); |
ceeb4318 | 8716 | for (Typed_identifier_list::const_iterator p = results->begin(); |
8717 | p != results->end(); | |
8718 | ++p) | |
8719 | { | |
8720 | Temporary_statement* temp = Statement::make_temporary(p->type(), | |
09ea332d | 8721 | NULL, loc); |
ceeb4318 | 8722 | inserter->insert(temp); |
8723 | temps->push_back(temp); | |
8724 | } | |
8725 | this->results_ = temps; | |
8726 | } | |
8727 | ||
e440a328 | 8728 | // Handle a call to a varargs function by packaging up the extra |
8729 | // parameters. | |
37448b10 | 8730 | if (fntype->is_varargs()) |
e440a328 | 8731 | { |
e440a328 | 8732 | const Typed_identifier_list* parameters = fntype->parameters(); |
c484d925 | 8733 | go_assert(parameters != NULL && !parameters->empty()); |
e440a328 | 8734 | Type* varargs_type = parameters->back().type(); |
09ea332d | 8735 | this->lower_varargs(gogo, function, inserter, varargs_type, |
8736 | parameters->size()); | |
8737 | } | |
8738 | ||
8739 | // If this is call to a method, call the method directly passing the | |
8740 | // object as the first parameter. | |
8741 | Bound_method_expression* bme = this->fn_->bound_method_expression(); | |
8742 | if (bme != NULL) | |
8743 | { | |
0afbb937 | 8744 | Named_object* methodfn = bme->function(); |
09ea332d | 8745 | Expression* first_arg = bme->first_argument(); |
8746 | ||
8747 | // We always pass a pointer when calling a method. | |
8748 | if (first_arg->type()->points_to() == NULL | |
8749 | && !first_arg->type()->is_error()) | |
8750 | { | |
8751 | first_arg = Expression::make_unary(OPERATOR_AND, first_arg, loc); | |
8752 | // We may need to create a temporary variable so that we can | |
8753 | // take the address. We can't do that here because it will | |
8754 | // mess up the order of evaluation. | |
8755 | Unary_expression* ue = static_cast<Unary_expression*>(first_arg); | |
8756 | ue->set_create_temp(); | |
8757 | } | |
8758 | ||
8759 | // If we are calling a method which was inherited from an | |
8760 | // embedded struct, and the method did not get a stub, then the | |
8761 | // first type may be wrong. | |
8762 | Type* fatype = bme->first_argument_type(); | |
8763 | if (fatype != NULL) | |
8764 | { | |
8765 | if (fatype->points_to() == NULL) | |
8766 | fatype = Type::make_pointer_type(fatype); | |
8767 | first_arg = Expression::make_unsafe_cast(fatype, first_arg, loc); | |
8768 | } | |
8769 | ||
8770 | Expression_list* new_args = new Expression_list(); | |
8771 | new_args->push_back(first_arg); | |
8772 | if (this->args_ != NULL) | |
8773 | { | |
8774 | for (Expression_list::const_iterator p = this->args_->begin(); | |
8775 | p != this->args_->end(); | |
8776 | ++p) | |
8777 | new_args->push_back(*p); | |
8778 | } | |
8779 | ||
8780 | // We have to change in place because this structure may be | |
8781 | // referenced by Call_result_expressions. We can't delete the | |
8782 | // old arguments, because we may be traversing them up in some | |
8783 | // caller. FIXME. | |
8784 | this->args_ = new_args; | |
0afbb937 | 8785 | this->fn_ = Expression::make_func_reference(methodfn, NULL, |
09ea332d | 8786 | bme->location()); |
e440a328 | 8787 | } |
8788 | ||
8789 | return this; | |
8790 | } | |
8791 | ||
8792 | // Lower a call to a varargs function. FUNCTION is the function in | |
8793 | // which the call occurs--it's not the function we are calling. | |
8794 | // VARARGS_TYPE is the type of the varargs parameter, a slice type. | |
8795 | // PARAM_COUNT is the number of parameters of the function we are | |
8796 | // calling; the last of these parameters will be the varargs | |
8797 | // parameter. | |
8798 | ||
09ea332d | 8799 | void |
e440a328 | 8800 | Call_expression::lower_varargs(Gogo* gogo, Named_object* function, |
ceeb4318 | 8801 | Statement_inserter* inserter, |
e440a328 | 8802 | Type* varargs_type, size_t param_count) |
8803 | { | |
8804 | if (this->varargs_are_lowered_) | |
09ea332d | 8805 | return; |
e440a328 | 8806 | |
b13c66cd | 8807 | Location loc = this->location(); |
e440a328 | 8808 | |
c484d925 | 8809 | go_assert(param_count > 0); |
411eb89e | 8810 | go_assert(varargs_type->is_slice_type()); |
e440a328 | 8811 | |
8812 | size_t arg_count = this->args_ == NULL ? 0 : this->args_->size(); | |
8813 | if (arg_count < param_count - 1) | |
8814 | { | |
8815 | // Not enough arguments; will be caught in check_types. | |
09ea332d | 8816 | return; |
e440a328 | 8817 | } |
8818 | ||
8819 | Expression_list* old_args = this->args_; | |
8820 | Expression_list* new_args = new Expression_list(); | |
8821 | bool push_empty_arg = false; | |
8822 | if (old_args == NULL || old_args->empty()) | |
8823 | { | |
c484d925 | 8824 | go_assert(param_count == 1); |
e440a328 | 8825 | push_empty_arg = true; |
8826 | } | |
8827 | else | |
8828 | { | |
8829 | Expression_list::const_iterator pa; | |
8830 | int i = 1; | |
8831 | for (pa = old_args->begin(); pa != old_args->end(); ++pa, ++i) | |
8832 | { | |
8833 | if (static_cast<size_t>(i) == param_count) | |
8834 | break; | |
8835 | new_args->push_back(*pa); | |
8836 | } | |
8837 | ||
8838 | // We have reached the varargs parameter. | |
8839 | ||
8840 | bool issued_error = false; | |
8841 | if (pa == old_args->end()) | |
8842 | push_empty_arg = true; | |
8843 | else if (pa + 1 == old_args->end() && this->is_varargs_) | |
8844 | new_args->push_back(*pa); | |
8845 | else if (this->is_varargs_) | |
8846 | { | |
a6645f74 | 8847 | if ((*pa)->type()->is_slice_type()) |
8848 | this->report_error(_("too many arguments")); | |
8849 | else | |
8850 | { | |
8851 | error_at(this->location(), | |
8852 | _("invalid use of %<...%> with non-slice")); | |
8853 | this->set_is_error(); | |
8854 | } | |
09ea332d | 8855 | return; |
e440a328 | 8856 | } |
e440a328 | 8857 | else |
8858 | { | |
8859 | Type* element_type = varargs_type->array_type()->element_type(); | |
8860 | Expression_list* vals = new Expression_list; | |
8861 | for (; pa != old_args->end(); ++pa, ++i) | |
8862 | { | |
8863 | // Check types here so that we get a better message. | |
8864 | Type* patype = (*pa)->type(); | |
b13c66cd | 8865 | Location paloc = (*pa)->location(); |
e440a328 | 8866 | if (!this->check_argument_type(i, element_type, patype, |
8867 | paloc, issued_error)) | |
8868 | continue; | |
8869 | vals->push_back(*pa); | |
8870 | } | |
8871 | Expression* val = | |
8872 | Expression::make_slice_composite_literal(varargs_type, vals, loc); | |
09ea332d | 8873 | gogo->lower_expression(function, inserter, &val); |
e440a328 | 8874 | new_args->push_back(val); |
8875 | } | |
8876 | } | |
8877 | ||
8878 | if (push_empty_arg) | |
8879 | new_args->push_back(Expression::make_nil(loc)); | |
8880 | ||
8881 | // We can't return a new call expression here, because this one may | |
6d4c2432 | 8882 | // be referenced by Call_result expressions. FIXME. We can't |
8883 | // delete OLD_ARGS because we may have both a Call_expression and a | |
8884 | // Builtin_call_expression which refer to them. FIXME. | |
e440a328 | 8885 | this->args_ = new_args; |
8886 | this->varargs_are_lowered_ = true; | |
e440a328 | 8887 | } |
8888 | ||
2c809f8f | 8889 | // Flatten a call with multiple results into a temporary. |
8890 | ||
8891 | Expression* | |
b8e86a51 | 8892 | Call_expression::do_flatten(Gogo* gogo, Named_object*, |
8893 | Statement_inserter* inserter) | |
2c809f8f | 8894 | { |
5bf8be8b | 8895 | if (this->is_erroneous_call()) |
8896 | { | |
8897 | go_assert(saw_errors()); | |
8898 | return Expression::make_error(this->location()); | |
8899 | } | |
b8e86a51 | 8900 | |
91c0fd76 | 8901 | if (this->is_flattened_) |
8902 | return this; | |
8903 | this->is_flattened_ = true; | |
8904 | ||
b8e86a51 | 8905 | // Add temporary variables for all arguments that require type |
8906 | // conversion. | |
8907 | Function_type* fntype = this->get_function_type(); | |
9782d556 | 8908 | if (fntype == NULL) |
8909 | { | |
8910 | go_assert(saw_errors()); | |
8911 | return this; | |
8912 | } | |
b8e86a51 | 8913 | if (this->args_ != NULL && !this->args_->empty() |
8914 | && fntype->parameters() != NULL && !fntype->parameters()->empty()) | |
8915 | { | |
8916 | bool is_interface_method = | |
8917 | this->fn_->interface_field_reference_expression() != NULL; | |
8918 | ||
8919 | Expression_list *args = new Expression_list(); | |
8920 | Typed_identifier_list::const_iterator pp = fntype->parameters()->begin(); | |
8921 | Expression_list::const_iterator pa = this->args_->begin(); | |
8922 | if (!is_interface_method && fntype->is_method()) | |
8923 | { | |
8924 | // The receiver argument. | |
8925 | args->push_back(*pa); | |
8926 | ++pa; | |
8927 | } | |
8928 | for (; pa != this->args_->end(); ++pa, ++pp) | |
8929 | { | |
8930 | go_assert(pp != fntype->parameters()->end()); | |
8931 | if (Type::are_identical(pp->type(), (*pa)->type(), true, NULL)) | |
8932 | args->push_back(*pa); | |
8933 | else | |
8934 | { | |
8935 | Location loc = (*pa)->location(); | |
8ba8cc87 | 8936 | Expression* arg = *pa; |
8937 | if (!arg->is_variable()) | |
8938 | { | |
8939 | Temporary_statement *temp = | |
8940 | Statement::make_temporary(NULL, arg, loc); | |
8941 | inserter->insert(temp); | |
8942 | arg = Expression::make_temporary_reference(temp, loc); | |
8943 | } | |
8944 | arg = Expression::convert_for_assignment(gogo, pp->type(), arg, | |
8945 | loc); | |
8946 | args->push_back(arg); | |
b8e86a51 | 8947 | } |
8948 | } | |
8949 | delete this->args_; | |
8950 | this->args_ = args; | |
8951 | } | |
8952 | ||
2c809f8f | 8953 | size_t rc = this->result_count(); |
8954 | if (rc > 1 && this->call_temp_ == NULL) | |
8955 | { | |
8956 | Struct_field_list* sfl = new Struct_field_list(); | |
8957 | Function_type* fntype = this->get_function_type(); | |
8958 | const Typed_identifier_list* results = fntype->results(); | |
8959 | Location loc = this->location(); | |
8960 | ||
8961 | int i = 0; | |
8962 | char buf[10]; | |
8963 | for (Typed_identifier_list::const_iterator p = results->begin(); | |
8964 | p != results->end(); | |
8965 | ++p, ++i) | |
8966 | { | |
8967 | snprintf(buf, sizeof buf, "res%d", i); | |
8968 | sfl->push_back(Struct_field(Typed_identifier(buf, p->type(), loc))); | |
8969 | } | |
8970 | ||
8971 | Struct_type* st = Type::make_struct_type(sfl, loc); | |
8972 | this->call_temp_ = Statement::make_temporary(st, NULL, loc); | |
8973 | inserter->insert(this->call_temp_); | |
8974 | } | |
8975 | ||
8976 | return this; | |
8977 | } | |
8978 | ||
ceeb4318 | 8979 | // Get the function type. This can return NULL in error cases. |
e440a328 | 8980 | |
8981 | Function_type* | |
8982 | Call_expression::get_function_type() const | |
8983 | { | |
8984 | return this->fn_->type()->function_type(); | |
8985 | } | |
8986 | ||
8987 | // Return the number of values which this call will return. | |
8988 | ||
8989 | size_t | |
8990 | Call_expression::result_count() const | |
8991 | { | |
8992 | const Function_type* fntype = this->get_function_type(); | |
8993 | if (fntype == NULL) | |
8994 | return 0; | |
8995 | if (fntype->results() == NULL) | |
8996 | return 0; | |
8997 | return fntype->results()->size(); | |
8998 | } | |
8999 | ||
ceeb4318 | 9000 | // Return the temporary which holds a result. |
9001 | ||
9002 | Temporary_statement* | |
9003 | Call_expression::result(size_t i) const | |
9004 | { | |
cd238b8d | 9005 | if (this->results_ == NULL || this->results_->size() <= i) |
9006 | { | |
9007 | go_assert(saw_errors()); | |
9008 | return NULL; | |
9009 | } | |
ceeb4318 | 9010 | return (*this->results_)[i]; |
9011 | } | |
9012 | ||
1373401e | 9013 | // Set the number of results expected from a call expression. |
9014 | ||
9015 | void | |
9016 | Call_expression::set_expected_result_count(size_t count) | |
9017 | { | |
9018 | go_assert(this->expected_result_count_ == 0); | |
9019 | this->expected_result_count_ = count; | |
9020 | } | |
9021 | ||
e440a328 | 9022 | // Return whether this is a call to the predeclared function recover. |
9023 | ||
9024 | bool | |
9025 | Call_expression::is_recover_call() const | |
9026 | { | |
9027 | return this->do_is_recover_call(); | |
9028 | } | |
9029 | ||
9030 | // Set the argument to the recover function. | |
9031 | ||
9032 | void | |
9033 | Call_expression::set_recover_arg(Expression* arg) | |
9034 | { | |
9035 | this->do_set_recover_arg(arg); | |
9036 | } | |
9037 | ||
9038 | // Virtual functions also implemented by Builtin_call_expression. | |
9039 | ||
9040 | bool | |
9041 | Call_expression::do_is_recover_call() const | |
9042 | { | |
9043 | return false; | |
9044 | } | |
9045 | ||
9046 | void | |
9047 | Call_expression::do_set_recover_arg(Expression*) | |
9048 | { | |
c3e6f413 | 9049 | go_unreachable(); |
e440a328 | 9050 | } |
9051 | ||
ceeb4318 | 9052 | // We have found an error with this call expression; return true if |
9053 | // we should report it. | |
9054 | ||
9055 | bool | |
9056 | Call_expression::issue_error() | |
9057 | { | |
9058 | if (this->issued_error_) | |
9059 | return false; | |
9060 | else | |
9061 | { | |
9062 | this->issued_error_ = true; | |
9063 | return true; | |
9064 | } | |
9065 | } | |
9066 | ||
5bf8be8b | 9067 | // Whether or not this call contains errors, either in the call or the |
9068 | // arguments to the call. | |
9069 | ||
9070 | bool | |
9071 | Call_expression::is_erroneous_call() | |
9072 | { | |
9073 | if (this->is_error_expression() || this->fn()->is_error_expression()) | |
9074 | return true; | |
9075 | ||
9076 | if (this->args() == NULL) | |
9077 | return false; | |
9078 | for (Expression_list::iterator pa = this->args()->begin(); | |
9079 | pa != this->args()->end(); | |
9080 | ++pa) | |
9081 | { | |
9082 | if ((*pa)->type()->is_error_type() || (*pa)->is_error_expression()) | |
9083 | return true; | |
9084 | } | |
9085 | return false; | |
9086 | } | |
9087 | ||
e440a328 | 9088 | // Get the type. |
9089 | ||
9090 | Type* | |
9091 | Call_expression::do_type() | |
9092 | { | |
9093 | if (this->type_ != NULL) | |
9094 | return this->type_; | |
9095 | ||
9096 | Type* ret; | |
9097 | Function_type* fntype = this->get_function_type(); | |
9098 | if (fntype == NULL) | |
9099 | return Type::make_error_type(); | |
9100 | ||
9101 | const Typed_identifier_list* results = fntype->results(); | |
9102 | if (results == NULL) | |
9103 | ret = Type::make_void_type(); | |
9104 | else if (results->size() == 1) | |
9105 | ret = results->begin()->type(); | |
9106 | else | |
9107 | ret = Type::make_call_multiple_result_type(this); | |
9108 | ||
9109 | this->type_ = ret; | |
9110 | ||
9111 | return this->type_; | |
9112 | } | |
9113 | ||
9114 | // Determine types for a call expression. We can use the function | |
9115 | // parameter types to set the types of the arguments. | |
9116 | ||
9117 | void | |
9118 | Call_expression::do_determine_type(const Type_context*) | |
9119 | { | |
fb94b0ca | 9120 | if (!this->determining_types()) |
9121 | return; | |
9122 | ||
e440a328 | 9123 | this->fn_->determine_type_no_context(); |
9124 | Function_type* fntype = this->get_function_type(); | |
9125 | const Typed_identifier_list* parameters = NULL; | |
9126 | if (fntype != NULL) | |
9127 | parameters = fntype->parameters(); | |
9128 | if (this->args_ != NULL) | |
9129 | { | |
9130 | Typed_identifier_list::const_iterator pt; | |
9131 | if (parameters != NULL) | |
9132 | pt = parameters->begin(); | |
09ea332d | 9133 | bool first = true; |
e440a328 | 9134 | for (Expression_list::const_iterator pa = this->args_->begin(); |
9135 | pa != this->args_->end(); | |
9136 | ++pa) | |
9137 | { | |
09ea332d | 9138 | if (first) |
9139 | { | |
9140 | first = false; | |
9141 | // If this is a method, the first argument is the | |
9142 | // receiver. | |
9143 | if (fntype != NULL && fntype->is_method()) | |
9144 | { | |
9145 | Type* rtype = fntype->receiver()->type(); | |
9146 | // The receiver is always passed as a pointer. | |
9147 | if (rtype->points_to() == NULL) | |
9148 | rtype = Type::make_pointer_type(rtype); | |
9149 | Type_context subcontext(rtype, false); | |
9150 | (*pa)->determine_type(&subcontext); | |
9151 | continue; | |
9152 | } | |
9153 | } | |
9154 | ||
e440a328 | 9155 | if (parameters != NULL && pt != parameters->end()) |
9156 | { | |
9157 | Type_context subcontext(pt->type(), false); | |
9158 | (*pa)->determine_type(&subcontext); | |
9159 | ++pt; | |
9160 | } | |
9161 | else | |
9162 | (*pa)->determine_type_no_context(); | |
9163 | } | |
9164 | } | |
9165 | } | |
9166 | ||
fb94b0ca | 9167 | // Called when determining types for a Call_expression. Return true |
9168 | // if we should go ahead, false if they have already been determined. | |
9169 | ||
9170 | bool | |
9171 | Call_expression::determining_types() | |
9172 | { | |
9173 | if (this->types_are_determined_) | |
9174 | return false; | |
9175 | else | |
9176 | { | |
9177 | this->types_are_determined_ = true; | |
9178 | return true; | |
9179 | } | |
9180 | } | |
9181 | ||
e440a328 | 9182 | // Check types for parameter I. |
9183 | ||
9184 | bool | |
9185 | Call_expression::check_argument_type(int i, const Type* parameter_type, | |
9186 | const Type* argument_type, | |
b13c66cd | 9187 | Location argument_location, |
e440a328 | 9188 | bool issued_error) |
9189 | { | |
9190 | std::string reason; | |
1eae365b | 9191 | if (!Type::are_assignable(parameter_type, argument_type, &reason)) |
e440a328 | 9192 | { |
9193 | if (!issued_error) | |
9194 | { | |
9195 | if (reason.empty()) | |
9196 | error_at(argument_location, "argument %d has incompatible type", i); | |
9197 | else | |
9198 | error_at(argument_location, | |
9199 | "argument %d has incompatible type (%s)", | |
9200 | i, reason.c_str()); | |
9201 | } | |
9202 | this->set_is_error(); | |
9203 | return false; | |
9204 | } | |
9205 | return true; | |
9206 | } | |
9207 | ||
9208 | // Check types. | |
9209 | ||
9210 | void | |
9211 | Call_expression::do_check_types(Gogo*) | |
9212 | { | |
a6645f74 | 9213 | if (this->classification() == EXPRESSION_ERROR) |
9214 | return; | |
9215 | ||
e440a328 | 9216 | Function_type* fntype = this->get_function_type(); |
9217 | if (fntype == NULL) | |
9218 | { | |
5c13bd80 | 9219 | if (!this->fn_->type()->is_error()) |
e440a328 | 9220 | this->report_error(_("expected function")); |
9221 | return; | |
9222 | } | |
9223 | ||
1373401e | 9224 | if (this->expected_result_count_ != 0 |
9225 | && this->expected_result_count_ != this->result_count()) | |
9226 | { | |
9227 | if (this->issue_error()) | |
9228 | this->report_error(_("function result count mismatch")); | |
9229 | this->set_is_error(); | |
9230 | return; | |
9231 | } | |
9232 | ||
09ea332d | 9233 | bool is_method = fntype->is_method(); |
9234 | if (is_method) | |
e440a328 | 9235 | { |
09ea332d | 9236 | go_assert(this->args_ != NULL && !this->args_->empty()); |
9237 | Type* rtype = fntype->receiver()->type(); | |
9238 | Expression* first_arg = this->args_->front(); | |
1eae365b | 9239 | // We dereference the values since receivers are always passed |
9240 | // as pointers. | |
09ea332d | 9241 | std::string reason; |
1eae365b | 9242 | if (!Type::are_assignable(rtype->deref(), first_arg->type()->deref(), |
9243 | &reason)) | |
e440a328 | 9244 | { |
09ea332d | 9245 | if (reason.empty()) |
9246 | this->report_error(_("incompatible type for receiver")); | |
9247 | else | |
e440a328 | 9248 | { |
09ea332d | 9249 | error_at(this->location(), |
9250 | "incompatible type for receiver (%s)", | |
9251 | reason.c_str()); | |
9252 | this->set_is_error(); | |
e440a328 | 9253 | } |
9254 | } | |
9255 | } | |
9256 | ||
9257 | // Note that varargs was handled by the lower_varargs() method, so | |
a6645f74 | 9258 | // we don't have to worry about it here unless something is wrong. |
9259 | if (this->is_varargs_ && !this->varargs_are_lowered_) | |
9260 | { | |
9261 | if (!fntype->is_varargs()) | |
9262 | { | |
9263 | error_at(this->location(), | |
9264 | _("invalid use of %<...%> calling non-variadic function")); | |
9265 | this->set_is_error(); | |
9266 | return; | |
9267 | } | |
9268 | } | |
e440a328 | 9269 | |
9270 | const Typed_identifier_list* parameters = fntype->parameters(); | |
9271 | if (this->args_ == NULL) | |
9272 | { | |
9273 | if (parameters != NULL && !parameters->empty()) | |
9274 | this->report_error(_("not enough arguments")); | |
9275 | } | |
9276 | else if (parameters == NULL) | |
09ea332d | 9277 | { |
9278 | if (!is_method || this->args_->size() > 1) | |
9279 | this->report_error(_("too many arguments")); | |
9280 | } | |
1373401e | 9281 | else if (this->args_->size() == 1 |
9282 | && this->args_->front()->call_expression() != NULL | |
9283 | && this->args_->front()->call_expression()->result_count() > 1) | |
9284 | { | |
9285 | // This is F(G()) when G returns more than one result. If the | |
9286 | // results can be matched to parameters, it would have been | |
9287 | // lowered in do_lower. If we get here we know there is a | |
9288 | // mismatch. | |
9289 | if (this->args_->front()->call_expression()->result_count() | |
9290 | < parameters->size()) | |
9291 | this->report_error(_("not enough arguments")); | |
9292 | else | |
9293 | this->report_error(_("too many arguments")); | |
9294 | } | |
e440a328 | 9295 | else |
9296 | { | |
9297 | int i = 0; | |
09ea332d | 9298 | Expression_list::const_iterator pa = this->args_->begin(); |
9299 | if (is_method) | |
9300 | ++pa; | |
9301 | for (Typed_identifier_list::const_iterator pt = parameters->begin(); | |
9302 | pt != parameters->end(); | |
9303 | ++pt, ++pa, ++i) | |
e440a328 | 9304 | { |
09ea332d | 9305 | if (pa == this->args_->end()) |
e440a328 | 9306 | { |
09ea332d | 9307 | this->report_error(_("not enough arguments")); |
e440a328 | 9308 | return; |
9309 | } | |
9310 | this->check_argument_type(i + 1, pt->type(), (*pa)->type(), | |
9311 | (*pa)->location(), false); | |
9312 | } | |
09ea332d | 9313 | if (pa != this->args_->end()) |
9314 | this->report_error(_("too many arguments")); | |
e440a328 | 9315 | } |
9316 | } | |
9317 | ||
72666aed | 9318 | Expression* |
9319 | Call_expression::do_copy() | |
9320 | { | |
9321 | Call_expression* call = | |
9322 | Expression::make_call(this->fn_->copy(), | |
9323 | (this->args_ == NULL | |
9324 | ? NULL | |
9325 | : this->args_->copy()), | |
9326 | this->is_varargs_, this->location()); | |
9327 | ||
9328 | if (this->varargs_are_lowered_) | |
9329 | call->set_varargs_are_lowered(); | |
9330 | return call; | |
9331 | } | |
9332 | ||
e440a328 | 9333 | // Return whether we have to use a temporary variable to ensure that |
9334 | // we evaluate this call expression in order. If the call returns no | |
ceeb4318 | 9335 | // results then it will inevitably be executed last. |
e440a328 | 9336 | |
9337 | bool | |
9338 | Call_expression::do_must_eval_in_order() const | |
9339 | { | |
ceeb4318 | 9340 | return this->result_count() > 0; |
e440a328 | 9341 | } |
9342 | ||
e440a328 | 9343 | // Get the function and the first argument to use when calling an |
9344 | // interface method. | |
9345 | ||
2387f644 | 9346 | Expression* |
e440a328 | 9347 | Call_expression::interface_method_function( |
e440a328 | 9348 | Interface_field_reference_expression* interface_method, |
2387f644 | 9349 | Expression** first_arg_ptr) |
e440a328 | 9350 | { |
2387f644 | 9351 | *first_arg_ptr = interface_method->get_underlying_object(); |
9352 | return interface_method->get_function(); | |
e440a328 | 9353 | } |
9354 | ||
9355 | // Build the call expression. | |
9356 | ||
ea664253 | 9357 | Bexpression* |
9358 | Call_expression::do_get_backend(Translate_context* context) | |
e440a328 | 9359 | { |
2c809f8f | 9360 | if (this->call_ != NULL) |
ea664253 | 9361 | return this->call_; |
e440a328 | 9362 | |
9363 | Function_type* fntype = this->get_function_type(); | |
9364 | if (fntype == NULL) | |
ea664253 | 9365 | return context->backend()->error_expression(); |
e440a328 | 9366 | |
9367 | if (this->fn_->is_error_expression()) | |
ea664253 | 9368 | return context->backend()->error_expression(); |
e440a328 | 9369 | |
9370 | Gogo* gogo = context->gogo(); | |
b13c66cd | 9371 | Location location = this->location(); |
e440a328 | 9372 | |
9373 | Func_expression* func = this->fn_->func_expression(); | |
e440a328 | 9374 | Interface_field_reference_expression* interface_method = |
9375 | this->fn_->interface_field_reference_expression(); | |
9376 | const bool has_closure = func != NULL && func->closure() != NULL; | |
09ea332d | 9377 | const bool is_interface_method = interface_method != NULL; |
e440a328 | 9378 | |
f8bdf81a | 9379 | bool has_closure_arg; |
8381eda7 | 9380 | if (has_closure) |
f8bdf81a | 9381 | has_closure_arg = true; |
8381eda7 | 9382 | else if (func != NULL) |
f8bdf81a | 9383 | has_closure_arg = false; |
8381eda7 | 9384 | else if (is_interface_method) |
f8bdf81a | 9385 | has_closure_arg = false; |
8381eda7 | 9386 | else |
f8bdf81a | 9387 | has_closure_arg = true; |
8381eda7 | 9388 | |
e440a328 | 9389 | int nargs; |
2c809f8f | 9390 | std::vector<Bexpression*> fn_args; |
e440a328 | 9391 | if (this->args_ == NULL || this->args_->empty()) |
9392 | { | |
f8bdf81a | 9393 | nargs = is_interface_method ? 1 : 0; |
2c809f8f | 9394 | if (nargs > 0) |
9395 | fn_args.resize(1); | |
e440a328 | 9396 | } |
09ea332d | 9397 | else if (fntype->parameters() == NULL || fntype->parameters()->empty()) |
9398 | { | |
9399 | // Passing a receiver parameter. | |
9400 | go_assert(!is_interface_method | |
9401 | && fntype->is_method() | |
9402 | && this->args_->size() == 1); | |
f8bdf81a | 9403 | nargs = 1; |
2c809f8f | 9404 | fn_args.resize(1); |
ea664253 | 9405 | fn_args[0] = this->args_->front()->get_backend(context); |
09ea332d | 9406 | } |
e440a328 | 9407 | else |
9408 | { | |
9409 | const Typed_identifier_list* params = fntype->parameters(); | |
e440a328 | 9410 | |
9411 | nargs = this->args_->size(); | |
09ea332d | 9412 | int i = is_interface_method ? 1 : 0; |
e440a328 | 9413 | nargs += i; |
2c809f8f | 9414 | fn_args.resize(nargs); |
e440a328 | 9415 | |
9416 | Typed_identifier_list::const_iterator pp = params->begin(); | |
09ea332d | 9417 | Expression_list::const_iterator pe = this->args_->begin(); |
9418 | if (!is_interface_method && fntype->is_method()) | |
9419 | { | |
ea664253 | 9420 | fn_args[i] = (*pe)->get_backend(context); |
09ea332d | 9421 | ++pe; |
9422 | ++i; | |
9423 | } | |
9424 | for (; pe != this->args_->end(); ++pe, ++pp, ++i) | |
e440a328 | 9425 | { |
c484d925 | 9426 | go_assert(pp != params->end()); |
2c809f8f | 9427 | Expression* arg = |
9428 | Expression::convert_for_assignment(gogo, pp->type(), *pe, | |
9429 | location); | |
ea664253 | 9430 | fn_args[i] = arg->get_backend(context); |
e440a328 | 9431 | } |
c484d925 | 9432 | go_assert(pp == params->end()); |
f8bdf81a | 9433 | go_assert(i == nargs); |
e440a328 | 9434 | } |
9435 | ||
2c809f8f | 9436 | Expression* fn; |
9437 | Expression* closure = NULL; | |
8381eda7 | 9438 | if (func != NULL) |
9439 | { | |
9440 | Named_object* no = func->named_object(); | |
2c809f8f | 9441 | fn = Expression::make_func_code_reference(no, location); |
9442 | if (has_closure) | |
9443 | closure = func->closure(); | |
8381eda7 | 9444 | } |
09ea332d | 9445 | else if (!is_interface_method) |
8381eda7 | 9446 | { |
2c809f8f | 9447 | closure = this->fn_; |
9448 | ||
9449 | // The backend representation of this function type is a pointer | |
9450 | // to a struct whose first field is the actual function to call. | |
9451 | Type* pfntype = | |
9452 | Type::make_pointer_type( | |
9453 | Type::make_pointer_type(Type::make_void_type())); | |
9454 | fn = Expression::make_unsafe_cast(pfntype, this->fn_, location); | |
9455 | fn = Expression::make_unary(OPERATOR_MULT, fn, location); | |
9456 | } | |
e440a328 | 9457 | else |
cf609de4 | 9458 | { |
2387f644 | 9459 | Expression* first_arg; |
2c809f8f | 9460 | fn = this->interface_method_function(interface_method, &first_arg); |
ea664253 | 9461 | fn_args[0] = first_arg->get_backend(context); |
e440a328 | 9462 | } |
9463 | ||
1ecc6157 | 9464 | Bexpression* bclosure = NULL; |
9465 | if (has_closure_arg) | |
9466 | bclosure = closure->get_backend(context); | |
f8bdf81a | 9467 | else |
1ecc6157 | 9468 | go_assert(closure == NULL); |
f8bdf81a | 9469 | |
ea664253 | 9470 | Bexpression* bfn = fn->get_backend(context); |
80d1e1a8 | 9471 | |
9472 | // When not calling a named function directly, use a type conversion | |
9473 | // in case the type of the function is a recursive type which refers | |
9474 | // to itself. We don't do this for an interface method because 1) | |
9475 | // an interface method never refers to itself, so we always have a | |
9476 | // function type here; 2) we pass an extra first argument to an | |
9477 | // interface method, so fntype is not correct. | |
9478 | if (func == NULL && !is_interface_method) | |
9479 | { | |
9480 | Btype* bft = fntype->get_backend_fntype(gogo); | |
9481 | bfn = gogo->backend()->convert_expression(bft, bfn, location); | |
9482 | } | |
9483 | ||
1ecc6157 | 9484 | Bexpression* call = gogo->backend()->call_expression(bfn, fn_args, |
9485 | bclosure, location); | |
e440a328 | 9486 | |
2c809f8f | 9487 | if (this->results_ != NULL) |
e440a328 | 9488 | { |
2c809f8f | 9489 | go_assert(this->call_temp_ != NULL); |
9490 | Expression* call_ref = | |
9491 | Expression::make_temporary_reference(this->call_temp_, location); | |
ea664253 | 9492 | Bexpression* bcall_ref = call_ref->get_backend(context); |
2c809f8f | 9493 | Bstatement* assn_stmt = |
9494 | gogo->backend()->assignment_statement(bcall_ref, call, location); | |
e440a328 | 9495 | |
2c809f8f | 9496 | this->call_ = this->set_results(context, bcall_ref); |
e440a328 | 9497 | |
2c809f8f | 9498 | Bexpression* set_and_call = |
9499 | gogo->backend()->compound_expression(assn_stmt, this->call_, | |
9500 | location); | |
ea664253 | 9501 | return set_and_call; |
2c809f8f | 9502 | } |
e440a328 | 9503 | |
2c809f8f | 9504 | this->call_ = call; |
ea664253 | 9505 | return this->call_; |
e440a328 | 9506 | } |
9507 | ||
ceeb4318 | 9508 | // Set the result variables if this call returns multiple results. |
9509 | ||
2c809f8f | 9510 | Bexpression* |
9511 | Call_expression::set_results(Translate_context* context, Bexpression* call) | |
ceeb4318 | 9512 | { |
2c809f8f | 9513 | Gogo* gogo = context->gogo(); |
ceeb4318 | 9514 | |
2c809f8f | 9515 | Bexpression* results = NULL; |
b13c66cd | 9516 | Location loc = this->location(); |
2c809f8f | 9517 | |
ceeb4318 | 9518 | size_t rc = this->result_count(); |
2c809f8f | 9519 | for (size_t i = 0; i < rc; ++i) |
ceeb4318 | 9520 | { |
ceeb4318 | 9521 | Temporary_statement* temp = this->result(i); |
cd238b8d | 9522 | if (temp == NULL) |
9523 | { | |
9524 | go_assert(saw_errors()); | |
2c809f8f | 9525 | return gogo->backend()->error_expression(); |
cd238b8d | 9526 | } |
ceeb4318 | 9527 | Temporary_reference_expression* ref = |
9528 | Expression::make_temporary_reference(temp, loc); | |
9529 | ref->set_is_lvalue(); | |
ceeb4318 | 9530 | |
ea664253 | 9531 | Bexpression* result_ref = ref->get_backend(context); |
2c809f8f | 9532 | Bexpression* call_result = |
9533 | gogo->backend()->struct_field_expression(call, i, loc); | |
9534 | Bstatement* assn_stmt = | |
9535 | gogo->backend()->assignment_statement(result_ref, call_result, loc); | |
ceeb4318 | 9536 | |
2c809f8f | 9537 | Bexpression* result = |
9538 | gogo->backend()->compound_expression(assn_stmt, call_result, loc); | |
ceeb4318 | 9539 | |
2c809f8f | 9540 | if (results == NULL) |
9541 | results = result; | |
9542 | else | |
9543 | { | |
9544 | Bstatement* expr_stmt = gogo->backend()->expression_statement(result); | |
9545 | results = | |
9546 | gogo->backend()->compound_expression(expr_stmt, results, loc); | |
9547 | } | |
9548 | } | |
9549 | return results; | |
ceeb4318 | 9550 | } |
9551 | ||
d751bb78 | 9552 | // Dump ast representation for a call expressin. |
9553 | ||
9554 | void | |
9555 | Call_expression::do_dump_expression(Ast_dump_context* ast_dump_context) const | |
9556 | { | |
9557 | this->fn_->dump_expression(ast_dump_context); | |
9558 | ast_dump_context->ostream() << "("; | |
9559 | if (args_ != NULL) | |
9560 | ast_dump_context->dump_expression_list(this->args_); | |
9561 | ||
9562 | ast_dump_context->ostream() << ") "; | |
9563 | } | |
9564 | ||
e440a328 | 9565 | // Make a call expression. |
9566 | ||
9567 | Call_expression* | |
9568 | Expression::make_call(Expression* fn, Expression_list* args, bool is_varargs, | |
b13c66cd | 9569 | Location location) |
e440a328 | 9570 | { |
9571 | return new Call_expression(fn, args, is_varargs, location); | |
9572 | } | |
9573 | ||
da244e59 | 9574 | // Class Call_result_expression. |
e440a328 | 9575 | |
9576 | // Traverse a call result. | |
9577 | ||
9578 | int | |
9579 | Call_result_expression::do_traverse(Traverse* traverse) | |
9580 | { | |
9581 | if (traverse->remember_expression(this->call_)) | |
9582 | { | |
9583 | // We have already traversed the call expression. | |
9584 | return TRAVERSE_CONTINUE; | |
9585 | } | |
9586 | return Expression::traverse(&this->call_, traverse); | |
9587 | } | |
9588 | ||
9589 | // Get the type. | |
9590 | ||
9591 | Type* | |
9592 | Call_result_expression::do_type() | |
9593 | { | |
425dd051 | 9594 | if (this->classification() == EXPRESSION_ERROR) |
9595 | return Type::make_error_type(); | |
9596 | ||
e440a328 | 9597 | // THIS->CALL_ can be replaced with a temporary reference due to |
9598 | // Call_expression::do_must_eval_in_order when there is an error. | |
9599 | Call_expression* ce = this->call_->call_expression(); | |
9600 | if (ce == NULL) | |
5e85f268 | 9601 | { |
9602 | this->set_is_error(); | |
9603 | return Type::make_error_type(); | |
9604 | } | |
e440a328 | 9605 | Function_type* fntype = ce->get_function_type(); |
9606 | if (fntype == NULL) | |
5e85f268 | 9607 | { |
e37658e2 | 9608 | if (ce->issue_error()) |
99b3f06f | 9609 | { |
9610 | if (!ce->fn()->type()->is_error()) | |
9611 | this->report_error(_("expected function")); | |
9612 | } | |
5e85f268 | 9613 | this->set_is_error(); |
9614 | return Type::make_error_type(); | |
9615 | } | |
e440a328 | 9616 | const Typed_identifier_list* results = fntype->results(); |
ceeb4318 | 9617 | if (results == NULL || results->size() < 2) |
7b8d861f | 9618 | { |
ceeb4318 | 9619 | if (ce->issue_error()) |
9620 | this->report_error(_("number of results does not match " | |
9621 | "number of values")); | |
7b8d861f | 9622 | return Type::make_error_type(); |
9623 | } | |
e440a328 | 9624 | Typed_identifier_list::const_iterator pr = results->begin(); |
9625 | for (unsigned int i = 0; i < this->index_; ++i) | |
9626 | { | |
9627 | if (pr == results->end()) | |
425dd051 | 9628 | break; |
e440a328 | 9629 | ++pr; |
9630 | } | |
9631 | if (pr == results->end()) | |
425dd051 | 9632 | { |
ceeb4318 | 9633 | if (ce->issue_error()) |
9634 | this->report_error(_("number of results does not match " | |
9635 | "number of values")); | |
425dd051 | 9636 | return Type::make_error_type(); |
9637 | } | |
e440a328 | 9638 | return pr->type(); |
9639 | } | |
9640 | ||
425dd051 | 9641 | // Check the type. Just make sure that we trigger the warning in |
9642 | // do_type. | |
e440a328 | 9643 | |
9644 | void | |
9645 | Call_result_expression::do_check_types(Gogo*) | |
9646 | { | |
425dd051 | 9647 | this->type(); |
e440a328 | 9648 | } |
9649 | ||
9650 | // Determine the type. We have nothing to do here, but the 0 result | |
9651 | // needs to pass down to the caller. | |
9652 | ||
9653 | void | |
9654 | Call_result_expression::do_determine_type(const Type_context*) | |
9655 | { | |
fb94b0ca | 9656 | this->call_->determine_type_no_context(); |
e440a328 | 9657 | } |
9658 | ||
ea664253 | 9659 | // Return the backend representation. We just refer to the temporary set by the |
9660 | // call expression. We don't do this at lowering time because it makes it | |
ceeb4318 | 9661 | // hard to evaluate the call at the right time. |
e440a328 | 9662 | |
ea664253 | 9663 | Bexpression* |
9664 | Call_result_expression::do_get_backend(Translate_context* context) | |
e440a328 | 9665 | { |
ceeb4318 | 9666 | Call_expression* ce = this->call_->call_expression(); |
cd238b8d | 9667 | if (ce == NULL) |
9668 | { | |
9669 | go_assert(this->call_->is_error_expression()); | |
ea664253 | 9670 | return context->backend()->error_expression(); |
cd238b8d | 9671 | } |
ceeb4318 | 9672 | Temporary_statement* ts = ce->result(this->index_); |
cd238b8d | 9673 | if (ts == NULL) |
9674 | { | |
9675 | go_assert(saw_errors()); | |
ea664253 | 9676 | return context->backend()->error_expression(); |
cd238b8d | 9677 | } |
ceeb4318 | 9678 | Expression* ref = Expression::make_temporary_reference(ts, this->location()); |
ea664253 | 9679 | return ref->get_backend(context); |
e440a328 | 9680 | } |
9681 | ||
d751bb78 | 9682 | // Dump ast representation for a call result expression. |
9683 | ||
9684 | void | |
9685 | Call_result_expression::do_dump_expression(Ast_dump_context* ast_dump_context) | |
9686 | const | |
9687 | { | |
9688 | // FIXME: Wouldn't it be better if the call is assigned to a temporary | |
9689 | // (struct) and the fields are referenced instead. | |
9690 | ast_dump_context->ostream() << this->index_ << "@("; | |
9691 | ast_dump_context->dump_expression(this->call_); | |
9692 | ast_dump_context->ostream() << ")"; | |
9693 | } | |
9694 | ||
e440a328 | 9695 | // Make a reference to a single result of a call which returns |
9696 | // multiple results. | |
9697 | ||
9698 | Expression* | |
9699 | Expression::make_call_result(Call_expression* call, unsigned int index) | |
9700 | { | |
9701 | return new Call_result_expression(call, index); | |
9702 | } | |
9703 | ||
9704 | // Class Index_expression. | |
9705 | ||
9706 | // Traversal. | |
9707 | ||
9708 | int | |
9709 | Index_expression::do_traverse(Traverse* traverse) | |
9710 | { | |
9711 | if (Expression::traverse(&this->left_, traverse) == TRAVERSE_EXIT | |
9712 | || Expression::traverse(&this->start_, traverse) == TRAVERSE_EXIT | |
9713 | || (this->end_ != NULL | |
acf2b673 | 9714 | && Expression::traverse(&this->end_, traverse) == TRAVERSE_EXIT) |
9715 | || (this->cap_ != NULL | |
9716 | && Expression::traverse(&this->cap_, traverse) == TRAVERSE_EXIT)) | |
e440a328 | 9717 | return TRAVERSE_EXIT; |
9718 | return TRAVERSE_CONTINUE; | |
9719 | } | |
9720 | ||
9721 | // Lower an index expression. This converts the generic index | |
9722 | // expression into an array index, a string index, or a map index. | |
9723 | ||
9724 | Expression* | |
ceeb4318 | 9725 | Index_expression::do_lower(Gogo*, Named_object*, Statement_inserter*, int) |
e440a328 | 9726 | { |
b13c66cd | 9727 | Location location = this->location(); |
e440a328 | 9728 | Expression* left = this->left_; |
9729 | Expression* start = this->start_; | |
9730 | Expression* end = this->end_; | |
acf2b673 | 9731 | Expression* cap = this->cap_; |
e440a328 | 9732 | |
9733 | Type* type = left->type(); | |
5c13bd80 | 9734 | if (type->is_error()) |
d9f3743a | 9735 | { |
9736 | go_assert(saw_errors()); | |
9737 | return Expression::make_error(location); | |
9738 | } | |
b0cf7ddd | 9739 | else if (left->is_type_expression()) |
9740 | { | |
9741 | error_at(location, "attempt to index type expression"); | |
9742 | return Expression::make_error(location); | |
9743 | } | |
e440a328 | 9744 | else if (type->array_type() != NULL) |
acf2b673 | 9745 | return Expression::make_array_index(left, start, end, cap, location); |
e440a328 | 9746 | else if (type->points_to() != NULL |
9747 | && type->points_to()->array_type() != NULL | |
411eb89e | 9748 | && !type->points_to()->is_slice_type()) |
e440a328 | 9749 | { |
9750 | Expression* deref = Expression::make_unary(OPERATOR_MULT, left, | |
9751 | location); | |
38092374 | 9752 | |
9753 | // For an ordinary index into the array, the pointer will be | |
9754 | // dereferenced. For a slice it will not--the resulting slice | |
9755 | // will simply reuse the pointer, which is incorrect if that | |
9756 | // pointer is nil. | |
9757 | if (end != NULL || cap != NULL) | |
9758 | deref->issue_nil_check(); | |
9759 | ||
acf2b673 | 9760 | return Expression::make_array_index(deref, start, end, cap, location); |
e440a328 | 9761 | } |
9762 | else if (type->is_string_type()) | |
acf2b673 | 9763 | { |
9764 | if (cap != NULL) | |
9765 | { | |
9766 | error_at(location, "invalid 3-index slice of string"); | |
9767 | return Expression::make_error(location); | |
9768 | } | |
9769 | return Expression::make_string_index(left, start, end, location); | |
9770 | } | |
e440a328 | 9771 | else if (type->map_type() != NULL) |
9772 | { | |
acf2b673 | 9773 | if (end != NULL || cap != NULL) |
e440a328 | 9774 | { |
9775 | error_at(location, "invalid slice of map"); | |
9776 | return Expression::make_error(location); | |
9777 | } | |
6d4c2432 | 9778 | Map_index_expression* ret = Expression::make_map_index(left, start, |
9779 | location); | |
e440a328 | 9780 | if (this->is_lvalue_) |
9781 | ret->set_is_lvalue(); | |
9782 | return ret; | |
9783 | } | |
9784 | else | |
9785 | { | |
9786 | error_at(location, | |
9787 | "attempt to index object which is not array, string, or map"); | |
9788 | return Expression::make_error(location); | |
9789 | } | |
9790 | } | |
9791 | ||
acf2b673 | 9792 | // Write an indexed expression |
9793 | // (expr[expr:expr:expr], expr[expr:expr] or expr[expr]) to a dump context. | |
d751bb78 | 9794 | |
9795 | void | |
9796 | Index_expression::dump_index_expression(Ast_dump_context* ast_dump_context, | |
9797 | const Expression* expr, | |
9798 | const Expression* start, | |
acf2b673 | 9799 | const Expression* end, |
9800 | const Expression* cap) | |
d751bb78 | 9801 | { |
9802 | expr->dump_expression(ast_dump_context); | |
9803 | ast_dump_context->ostream() << "["; | |
9804 | start->dump_expression(ast_dump_context); | |
9805 | if (end != NULL) | |
9806 | { | |
9807 | ast_dump_context->ostream() << ":"; | |
9808 | end->dump_expression(ast_dump_context); | |
9809 | } | |
acf2b673 | 9810 | if (cap != NULL) |
9811 | { | |
9812 | ast_dump_context->ostream() << ":"; | |
9813 | cap->dump_expression(ast_dump_context); | |
9814 | } | |
d751bb78 | 9815 | ast_dump_context->ostream() << "]"; |
9816 | } | |
9817 | ||
9818 | // Dump ast representation for an index expression. | |
9819 | ||
9820 | void | |
9821 | Index_expression::do_dump_expression(Ast_dump_context* ast_dump_context) | |
9822 | const | |
9823 | { | |
9824 | Index_expression::dump_index_expression(ast_dump_context, this->left_, | |
acf2b673 | 9825 | this->start_, this->end_, this->cap_); |
d751bb78 | 9826 | } |
9827 | ||
e440a328 | 9828 | // Make an index expression. |
9829 | ||
9830 | Expression* | |
9831 | Expression::make_index(Expression* left, Expression* start, Expression* end, | |
acf2b673 | 9832 | Expression* cap, Location location) |
e440a328 | 9833 | { |
acf2b673 | 9834 | return new Index_expression(left, start, end, cap, location); |
e440a328 | 9835 | } |
9836 | ||
da244e59 | 9837 | // Class Array_index_expression. |
e440a328 | 9838 | |
9839 | // Array index traversal. | |
9840 | ||
9841 | int | |
9842 | Array_index_expression::do_traverse(Traverse* traverse) | |
9843 | { | |
9844 | if (Expression::traverse(&this->array_, traverse) == TRAVERSE_EXIT) | |
9845 | return TRAVERSE_EXIT; | |
9846 | if (Expression::traverse(&this->start_, traverse) == TRAVERSE_EXIT) | |
9847 | return TRAVERSE_EXIT; | |
9848 | if (this->end_ != NULL) | |
9849 | { | |
9850 | if (Expression::traverse(&this->end_, traverse) == TRAVERSE_EXIT) | |
9851 | return TRAVERSE_EXIT; | |
9852 | } | |
acf2b673 | 9853 | if (this->cap_ != NULL) |
9854 | { | |
9855 | if (Expression::traverse(&this->cap_, traverse) == TRAVERSE_EXIT) | |
9856 | return TRAVERSE_EXIT; | |
9857 | } | |
e440a328 | 9858 | return TRAVERSE_CONTINUE; |
9859 | } | |
9860 | ||
9861 | // Return the type of an array index. | |
9862 | ||
9863 | Type* | |
9864 | Array_index_expression::do_type() | |
9865 | { | |
9866 | if (this->type_ == NULL) | |
9867 | { | |
9868 | Array_type* type = this->array_->type()->array_type(); | |
9869 | if (type == NULL) | |
9870 | this->type_ = Type::make_error_type(); | |
9871 | else if (this->end_ == NULL) | |
9872 | this->type_ = type->element_type(); | |
411eb89e | 9873 | else if (type->is_slice_type()) |
e440a328 | 9874 | { |
9875 | // A slice of a slice has the same type as the original | |
9876 | // slice. | |
9877 | this->type_ = this->array_->type()->deref(); | |
9878 | } | |
9879 | else | |
9880 | { | |
9881 | // A slice of an array is a slice. | |
9882 | this->type_ = Type::make_array_type(type->element_type(), NULL); | |
9883 | } | |
9884 | } | |
9885 | return this->type_; | |
9886 | } | |
9887 | ||
9888 | // Set the type of an array index. | |
9889 | ||
9890 | void | |
9891 | Array_index_expression::do_determine_type(const Type_context*) | |
9892 | { | |
9893 | this->array_->determine_type_no_context(); | |
f77aa642 | 9894 | |
9895 | Type_context index_context(Type::lookup_integer_type("int"), false); | |
9896 | if (this->start_->is_constant()) | |
9897 | this->start_->determine_type(&index_context); | |
9898 | else | |
9899 | this->start_->determine_type_no_context(); | |
e440a328 | 9900 | if (this->end_ != NULL) |
f77aa642 | 9901 | { |
9902 | if (this->end_->is_constant()) | |
9903 | this->end_->determine_type(&index_context); | |
9904 | else | |
9905 | this->end_->determine_type_no_context(); | |
9906 | } | |
acf2b673 | 9907 | if (this->cap_ != NULL) |
f77aa642 | 9908 | { |
9909 | if (this->cap_->is_constant()) | |
9910 | this->cap_->determine_type(&index_context); | |
9911 | else | |
9912 | this->cap_->determine_type_no_context(); | |
9913 | } | |
e440a328 | 9914 | } |
9915 | ||
9916 | // Check types of an array index. | |
9917 | ||
9918 | void | |
9919 | Array_index_expression::do_check_types(Gogo*) | |
9920 | { | |
f6bc81e6 | 9921 | Numeric_constant nc; |
9922 | unsigned long v; | |
9923 | if (this->start_->type()->integer_type() == NULL | |
9924 | && !this->start_->type()->is_error() | |
9925 | && (!this->start_->numeric_constant_value(&nc) | |
9926 | || nc.to_unsigned_long(&v) == Numeric_constant::NC_UL_NOTINT)) | |
e440a328 | 9927 | this->report_error(_("index must be integer")); |
9928 | if (this->end_ != NULL | |
9929 | && this->end_->type()->integer_type() == NULL | |
99b3f06f | 9930 | && !this->end_->type()->is_error() |
9931 | && !this->end_->is_nil_expression() | |
f6bc81e6 | 9932 | && !this->end_->is_error_expression() |
9933 | && (!this->end_->numeric_constant_value(&nc) | |
9934 | || nc.to_unsigned_long(&v) == Numeric_constant::NC_UL_NOTINT)) | |
e440a328 | 9935 | this->report_error(_("slice end must be integer")); |
acf2b673 | 9936 | if (this->cap_ != NULL |
9937 | && this->cap_->type()->integer_type() == NULL | |
9938 | && !this->cap_->type()->is_error() | |
9939 | && !this->cap_->is_nil_expression() | |
9940 | && !this->cap_->is_error_expression() | |
9941 | && (!this->cap_->numeric_constant_value(&nc) | |
9942 | || nc.to_unsigned_long(&v) == Numeric_constant::NC_UL_NOTINT)) | |
9943 | this->report_error(_("slice capacity must be integer")); | |
e440a328 | 9944 | |
9945 | Array_type* array_type = this->array_->type()->array_type(); | |
f9c68f17 | 9946 | if (array_type == NULL) |
9947 | { | |
c484d925 | 9948 | go_assert(this->array_->type()->is_error()); |
f9c68f17 | 9949 | return; |
9950 | } | |
e440a328 | 9951 | |
9952 | unsigned int int_bits = | |
9953 | Type::lookup_integer_type("int")->integer_type()->bits(); | |
9954 | ||
0c77715b | 9955 | Numeric_constant lvalnc; |
e440a328 | 9956 | mpz_t lval; |
e440a328 | 9957 | bool lval_valid = (array_type->length() != NULL |
0c77715b | 9958 | && array_type->length()->numeric_constant_value(&lvalnc) |
9959 | && lvalnc.to_int(&lval)); | |
9960 | Numeric_constant inc; | |
e440a328 | 9961 | mpz_t ival; |
0bd5d859 | 9962 | bool ival_valid = false; |
0c77715b | 9963 | if (this->start_->numeric_constant_value(&inc) && inc.to_int(&ival)) |
e440a328 | 9964 | { |
0bd5d859 | 9965 | ival_valid = true; |
e440a328 | 9966 | if (mpz_sgn(ival) < 0 |
9967 | || mpz_sizeinbase(ival, 2) >= int_bits | |
9968 | || (lval_valid | |
9969 | && (this->end_ == NULL | |
9970 | ? mpz_cmp(ival, lval) >= 0 | |
9971 | : mpz_cmp(ival, lval) > 0))) | |
9972 | { | |
9973 | error_at(this->start_->location(), "array index out of bounds"); | |
9974 | this->set_is_error(); | |
9975 | } | |
9976 | } | |
9977 | if (this->end_ != NULL && !this->end_->is_nil_expression()) | |
9978 | { | |
0c77715b | 9979 | Numeric_constant enc; |
9980 | mpz_t eval; | |
acf2b673 | 9981 | bool eval_valid = false; |
0c77715b | 9982 | if (this->end_->numeric_constant_value(&enc) && enc.to_int(&eval)) |
e440a328 | 9983 | { |
acf2b673 | 9984 | eval_valid = true; |
0c77715b | 9985 | if (mpz_sgn(eval) < 0 |
9986 | || mpz_sizeinbase(eval, 2) >= int_bits | |
9987 | || (lval_valid && mpz_cmp(eval, lval) > 0)) | |
e440a328 | 9988 | { |
9989 | error_at(this->end_->location(), "array index out of bounds"); | |
9990 | this->set_is_error(); | |
9991 | } | |
0bd5d859 | 9992 | else if (ival_valid && mpz_cmp(ival, eval) > 0) |
9993 | this->report_error(_("inverted slice range")); | |
e440a328 | 9994 | } |
acf2b673 | 9995 | |
9996 | Numeric_constant cnc; | |
9997 | mpz_t cval; | |
9998 | if (this->cap_ != NULL | |
9999 | && this->cap_->numeric_constant_value(&cnc) && cnc.to_int(&cval)) | |
10000 | { | |
10001 | if (mpz_sgn(cval) < 0 | |
10002 | || mpz_sizeinbase(cval, 2) >= int_bits | |
10003 | || (lval_valid && mpz_cmp(cval, lval) > 0)) | |
10004 | { | |
10005 | error_at(this->cap_->location(), "array index out of bounds"); | |
10006 | this->set_is_error(); | |
10007 | } | |
10008 | else if (ival_valid && mpz_cmp(ival, cval) > 0) | |
10009 | { | |
10010 | error_at(this->cap_->location(), | |
10011 | "invalid slice index: capacity less than start"); | |
10012 | this->set_is_error(); | |
10013 | } | |
10014 | else if (eval_valid && mpz_cmp(eval, cval) > 0) | |
10015 | { | |
10016 | error_at(this->cap_->location(), | |
10017 | "invalid slice index: capacity less than length"); | |
10018 | this->set_is_error(); | |
10019 | } | |
10020 | mpz_clear(cval); | |
10021 | } | |
10022 | ||
10023 | if (eval_valid) | |
10024 | mpz_clear(eval); | |
e440a328 | 10025 | } |
0bd5d859 | 10026 | if (ival_valid) |
10027 | mpz_clear(ival); | |
0c77715b | 10028 | if (lval_valid) |
10029 | mpz_clear(lval); | |
e440a328 | 10030 | |
10031 | // A slice of an array requires an addressable array. A slice of a | |
10032 | // slice is always possible. | |
411eb89e | 10033 | if (this->end_ != NULL && !array_type->is_slice_type()) |
88ec30c8 | 10034 | { |
10035 | if (!this->array_->is_addressable()) | |
8da39c3b | 10036 | this->report_error(_("slice of unaddressable value")); |
88ec30c8 | 10037 | else |
10038 | this->array_->address_taken(true); | |
10039 | } | |
e440a328 | 10040 | } |
10041 | ||
2c809f8f | 10042 | // Flatten array indexing by using temporary variables for slices and indexes. |
35a54f17 | 10043 | |
10044 | Expression* | |
10045 | Array_index_expression::do_flatten(Gogo*, Named_object*, | |
10046 | Statement_inserter* inserter) | |
10047 | { | |
10048 | Location loc = this->location(); | |
5bf8be8b | 10049 | Expression* array = this->array_; |
10050 | Expression* start = this->start_; | |
10051 | Expression* end = this->end_; | |
10052 | Expression* cap = this->cap_; | |
10053 | if (array->is_error_expression() | |
10054 | || array->type()->is_error_type() | |
10055 | || start->is_error_expression() | |
10056 | || start->type()->is_error_type() | |
10057 | || (end != NULL | |
10058 | && (end->is_error_expression() || end->type()->is_error_type())) | |
10059 | || (cap != NULL | |
10060 | && (cap->is_error_expression() || cap->type()->is_error_type()))) | |
10061 | { | |
10062 | go_assert(saw_errors()); | |
10063 | return Expression::make_error(loc); | |
10064 | } | |
10065 | ||
2c809f8f | 10066 | Temporary_statement* temp; |
5bf8be8b | 10067 | if (array->type()->is_slice_type() && !array->is_variable()) |
35a54f17 | 10068 | { |
5bf8be8b | 10069 | temp = Statement::make_temporary(NULL, array, loc); |
35a54f17 | 10070 | inserter->insert(temp); |
10071 | this->array_ = Expression::make_temporary_reference(temp, loc); | |
10072 | } | |
5bf8be8b | 10073 | if (!start->is_variable()) |
2c809f8f | 10074 | { |
5bf8be8b | 10075 | temp = Statement::make_temporary(NULL, start, loc); |
2c809f8f | 10076 | inserter->insert(temp); |
10077 | this->start_ = Expression::make_temporary_reference(temp, loc); | |
10078 | } | |
5bf8be8b | 10079 | if (end != NULL |
10080 | && !end->is_nil_expression() | |
10081 | && !end->is_variable()) | |
2c809f8f | 10082 | { |
5bf8be8b | 10083 | temp = Statement::make_temporary(NULL, end, loc); |
2c809f8f | 10084 | inserter->insert(temp); |
10085 | this->end_ = Expression::make_temporary_reference(temp, loc); | |
10086 | } | |
5bf8be8b | 10087 | if (cap!= NULL && !cap->is_variable()) |
2c809f8f | 10088 | { |
5bf8be8b | 10089 | temp = Statement::make_temporary(NULL, cap, loc); |
2c809f8f | 10090 | inserter->insert(temp); |
10091 | this->cap_ = Expression::make_temporary_reference(temp, loc); | |
10092 | } | |
10093 | ||
35a54f17 | 10094 | return this; |
10095 | } | |
10096 | ||
e440a328 | 10097 | // Return whether this expression is addressable. |
10098 | ||
10099 | bool | |
10100 | Array_index_expression::do_is_addressable() const | |
10101 | { | |
10102 | // A slice expression is not addressable. | |
10103 | if (this->end_ != NULL) | |
10104 | return false; | |
10105 | ||
10106 | // An index into a slice is addressable. | |
411eb89e | 10107 | if (this->array_->type()->is_slice_type()) |
e440a328 | 10108 | return true; |
10109 | ||
10110 | // An index into an array is addressable if the array is | |
10111 | // addressable. | |
10112 | return this->array_->is_addressable(); | |
10113 | } | |
10114 | ||
ea664253 | 10115 | // Get the backend representation for an array index. |
e440a328 | 10116 | |
ea664253 | 10117 | Bexpression* |
10118 | Array_index_expression::do_get_backend(Translate_context* context) | |
e440a328 | 10119 | { |
e440a328 | 10120 | Array_type* array_type = this->array_->type()->array_type(); |
d8cd8e2d | 10121 | if (array_type == NULL) |
10122 | { | |
c484d925 | 10123 | go_assert(this->array_->type()->is_error()); |
ea664253 | 10124 | return context->backend()->error_expression(); |
d8cd8e2d | 10125 | } |
35a54f17 | 10126 | go_assert(!array_type->is_slice_type() || this->array_->is_variable()); |
e440a328 | 10127 | |
2c809f8f | 10128 | Location loc = this->location(); |
10129 | Gogo* gogo = context->gogo(); | |
10130 | ||
6dfedc16 | 10131 | Type* int_type = Type::lookup_integer_type("int"); |
10132 | Btype* int_btype = int_type->get_backend(gogo); | |
e440a328 | 10133 | |
2c809f8f | 10134 | // We need to convert the length and capacity to the Go "int" type here |
10135 | // because the length of a fixed-length array could be of type "uintptr" | |
10136 | // and gimple disallows binary operations between "uintptr" and other | |
10137 | // integer types. FIXME. | |
10138 | Bexpression* length = NULL; | |
a04bfdfc | 10139 | if (this->end_ == NULL || this->end_->is_nil_expression()) |
10140 | { | |
35a54f17 | 10141 | Expression* len = array_type->get_length(gogo, this->array_); |
ea664253 | 10142 | length = len->get_backend(context); |
2c809f8f | 10143 | length = gogo->backend()->convert_expression(int_btype, length, loc); |
a04bfdfc | 10144 | } |
10145 | ||
2c809f8f | 10146 | Bexpression* capacity = NULL; |
a04bfdfc | 10147 | if (this->end_ != NULL) |
10148 | { | |
35a54f17 | 10149 | Expression* cap = array_type->get_capacity(gogo, this->array_); |
ea664253 | 10150 | capacity = cap->get_backend(context); |
2c809f8f | 10151 | capacity = gogo->backend()->convert_expression(int_btype, capacity, loc); |
a04bfdfc | 10152 | } |
10153 | ||
2c809f8f | 10154 | Bexpression* cap_arg = capacity; |
acf2b673 | 10155 | if (this->cap_ != NULL) |
10156 | { | |
ea664253 | 10157 | cap_arg = this->cap_->get_backend(context); |
2c809f8f | 10158 | cap_arg = gogo->backend()->convert_expression(int_btype, cap_arg, loc); |
acf2b673 | 10159 | } |
10160 | ||
2c809f8f | 10161 | if (length == NULL) |
10162 | length = cap_arg; | |
e440a328 | 10163 | |
10164 | int code = (array_type->length() != NULL | |
10165 | ? (this->end_ == NULL | |
10166 | ? RUNTIME_ERROR_ARRAY_INDEX_OUT_OF_BOUNDS | |
10167 | : RUNTIME_ERROR_ARRAY_SLICE_OUT_OF_BOUNDS) | |
10168 | : (this->end_ == NULL | |
10169 | ? RUNTIME_ERROR_SLICE_INDEX_OUT_OF_BOUNDS | |
10170 | : RUNTIME_ERROR_SLICE_SLICE_OUT_OF_BOUNDS)); | |
ea664253 | 10171 | Bexpression* crash = gogo->runtime_error(code, loc)->get_backend(context); |
2c809f8f | 10172 | |
6dfedc16 | 10173 | if (this->start_->type()->integer_type() == NULL |
10174 | && !Type::are_convertible(int_type, this->start_->type(), NULL)) | |
10175 | { | |
10176 | go_assert(saw_errors()); | |
10177 | return context->backend()->error_expression(); | |
10178 | } | |
d9f3743a | 10179 | |
ea664253 | 10180 | Bexpression* bad_index = |
d9f3743a | 10181 | Expression::check_bounds(this->start_, loc)->get_backend(context); |
2c809f8f | 10182 | |
ea664253 | 10183 | Bexpression* start = this->start_->get_backend(context); |
2c809f8f | 10184 | start = gogo->backend()->convert_expression(int_btype, start, loc); |
10185 | Bexpression* start_too_large = | |
10186 | gogo->backend()->binary_expression((this->end_ == NULL | |
10187 | ? OPERATOR_GE | |
10188 | : OPERATOR_GT), | |
10189 | start, | |
10190 | (this->end_ == NULL | |
10191 | ? length | |
10192 | : capacity), | |
10193 | loc); | |
10194 | bad_index = gogo->backend()->binary_expression(OPERATOR_OROR, start_too_large, | |
10195 | bad_index, loc); | |
e440a328 | 10196 | |
10197 | if (this->end_ == NULL) | |
10198 | { | |
10199 | // Simple array indexing. This has to return an l-value, so | |
2c809f8f | 10200 | // wrap the index check into START. |
10201 | start = | |
10202 | gogo->backend()->conditional_expression(int_btype, bad_index, | |
10203 | crash, start, loc); | |
e440a328 | 10204 | |
2c809f8f | 10205 | Bexpression* ret; |
e440a328 | 10206 | if (array_type->length() != NULL) |
10207 | { | |
ea664253 | 10208 | Bexpression* array = this->array_->get_backend(context); |
2c809f8f | 10209 | ret = gogo->backend()->array_index_expression(array, start, loc); |
e440a328 | 10210 | } |
10211 | else | |
10212 | { | |
2c809f8f | 10213 | // Slice. |
10214 | Expression* valptr = | |
35a54f17 | 10215 | array_type->get_value_pointer(gogo, this->array_); |
ea664253 | 10216 | Bexpression* ptr = valptr->get_backend(context); |
2c809f8f | 10217 | ptr = gogo->backend()->pointer_offset_expression(ptr, start, loc); |
9b27b43c | 10218 | |
10219 | Type* ele_type = this->array_->type()->array_type()->element_type(); | |
10220 | Btype* ele_btype = ele_type->get_backend(gogo); | |
10221 | ret = gogo->backend()->indirect_expression(ele_btype, ptr, true, loc); | |
e440a328 | 10222 | } |
ea664253 | 10223 | return ret; |
e440a328 | 10224 | } |
10225 | ||
10226 | // Array slice. | |
10227 | ||
acf2b673 | 10228 | if (this->cap_ != NULL) |
10229 | { | |
2c809f8f | 10230 | Bexpression* bounds_bcheck = |
ea664253 | 10231 | Expression::check_bounds(this->cap_, loc)->get_backend(context); |
2c809f8f | 10232 | bad_index = |
10233 | gogo->backend()->binary_expression(OPERATOR_OROR, bounds_bcheck, | |
10234 | bad_index, loc); | |
10235 | cap_arg = gogo->backend()->convert_expression(int_btype, cap_arg, loc); | |
10236 | ||
10237 | Bexpression* cap_too_small = | |
10238 | gogo->backend()->binary_expression(OPERATOR_LT, cap_arg, start, loc); | |
10239 | Bexpression* cap_too_large = | |
10240 | gogo->backend()->binary_expression(OPERATOR_GT, cap_arg, capacity, loc); | |
10241 | Bexpression* bad_cap = | |
10242 | gogo->backend()->binary_expression(OPERATOR_OROR, cap_too_small, | |
10243 | cap_too_large, loc); | |
10244 | bad_index = gogo->backend()->binary_expression(OPERATOR_OROR, bad_cap, | |
10245 | bad_index, loc); | |
10246 | } | |
10247 | ||
10248 | Bexpression* end; | |
e440a328 | 10249 | if (this->end_->is_nil_expression()) |
2c809f8f | 10250 | end = length; |
e440a328 | 10251 | else |
10252 | { | |
2c809f8f | 10253 | Bexpression* bounds_bcheck = |
ea664253 | 10254 | Expression::check_bounds(this->end_, loc)->get_backend(context); |
e440a328 | 10255 | |
2c809f8f | 10256 | bad_index = |
10257 | gogo->backend()->binary_expression(OPERATOR_OROR, bounds_bcheck, | |
10258 | bad_index, loc); | |
e440a328 | 10259 | |
ea664253 | 10260 | end = this->end_->get_backend(context); |
2c809f8f | 10261 | end = gogo->backend()->convert_expression(int_btype, end, loc); |
10262 | Bexpression* end_too_small = | |
10263 | gogo->backend()->binary_expression(OPERATOR_LT, end, start, loc); | |
10264 | Bexpression* end_too_large = | |
10265 | gogo->backend()->binary_expression(OPERATOR_GT, end, cap_arg, loc); | |
10266 | Bexpression* bad_end = | |
10267 | gogo->backend()->binary_expression(OPERATOR_OROR, end_too_small, | |
10268 | end_too_large, loc); | |
10269 | bad_index = gogo->backend()->binary_expression(OPERATOR_OROR, bad_end, | |
10270 | bad_index, loc); | |
e440a328 | 10271 | } |
10272 | ||
35a54f17 | 10273 | Expression* valptr = array_type->get_value_pointer(gogo, this->array_); |
ea664253 | 10274 | Bexpression* val = valptr->get_backend(context); |
2c809f8f | 10275 | val = gogo->backend()->pointer_offset_expression(val, start, loc); |
e440a328 | 10276 | |
2c809f8f | 10277 | Bexpression* result_length = |
10278 | gogo->backend()->binary_expression(OPERATOR_MINUS, end, start, loc); | |
e440a328 | 10279 | |
2c809f8f | 10280 | Bexpression* result_capacity = |
10281 | gogo->backend()->binary_expression(OPERATOR_MINUS, cap_arg, start, loc); | |
e440a328 | 10282 | |
2c809f8f | 10283 | Btype* struct_btype = this->type()->get_backend(gogo); |
10284 | std::vector<Bexpression*> init; | |
10285 | init.push_back(val); | |
10286 | init.push_back(result_length); | |
10287 | init.push_back(result_capacity); | |
e440a328 | 10288 | |
2c809f8f | 10289 | Bexpression* ctor = |
10290 | gogo->backend()->constructor_expression(struct_btype, init, loc); | |
ea664253 | 10291 | return gogo->backend()->conditional_expression(struct_btype, bad_index, |
10292 | crash, ctor, loc); | |
e440a328 | 10293 | } |
10294 | ||
d751bb78 | 10295 | // Dump ast representation for an array index expression. |
10296 | ||
10297 | void | |
10298 | Array_index_expression::do_dump_expression(Ast_dump_context* ast_dump_context) | |
10299 | const | |
10300 | { | |
10301 | Index_expression::dump_index_expression(ast_dump_context, this->array_, | |
acf2b673 | 10302 | this->start_, this->end_, this->cap_); |
d751bb78 | 10303 | } |
10304 | ||
acf2b673 | 10305 | // Make an array index expression. END and CAP may be NULL. |
e440a328 | 10306 | |
10307 | Expression* | |
10308 | Expression::make_array_index(Expression* array, Expression* start, | |
acf2b673 | 10309 | Expression* end, Expression* cap, |
10310 | Location location) | |
e440a328 | 10311 | { |
acf2b673 | 10312 | return new Array_index_expression(array, start, end, cap, location); |
e440a328 | 10313 | } |
10314 | ||
10315 | // A string index. This is used for both indexing and slicing. | |
10316 | ||
10317 | class String_index_expression : public Expression | |
10318 | { | |
10319 | public: | |
10320 | String_index_expression(Expression* string, Expression* start, | |
b13c66cd | 10321 | Expression* end, Location location) |
e440a328 | 10322 | : Expression(EXPRESSION_STRING_INDEX, location), |
10323 | string_(string), start_(start), end_(end) | |
10324 | { } | |
10325 | ||
10326 | protected: | |
10327 | int | |
10328 | do_traverse(Traverse*); | |
10329 | ||
2c809f8f | 10330 | Expression* |
10331 | do_flatten(Gogo*, Named_object*, Statement_inserter*); | |
10332 | ||
e440a328 | 10333 | Type* |
10334 | do_type(); | |
10335 | ||
10336 | void | |
10337 | do_determine_type(const Type_context*); | |
10338 | ||
10339 | void | |
10340 | do_check_types(Gogo*); | |
10341 | ||
10342 | Expression* | |
10343 | do_copy() | |
10344 | { | |
10345 | return Expression::make_string_index(this->string_->copy(), | |
10346 | this->start_->copy(), | |
10347 | (this->end_ == NULL | |
10348 | ? NULL | |
10349 | : this->end_->copy()), | |
10350 | this->location()); | |
10351 | } | |
10352 | ||
baef9f7a | 10353 | bool |
10354 | do_must_eval_subexpressions_in_order(int* skip) const | |
10355 | { | |
10356 | *skip = 1; | |
10357 | return true; | |
10358 | } | |
10359 | ||
ea664253 | 10360 | Bexpression* |
10361 | do_get_backend(Translate_context*); | |
e440a328 | 10362 | |
d751bb78 | 10363 | void |
10364 | do_dump_expression(Ast_dump_context*) const; | |
10365 | ||
e440a328 | 10366 | private: |
10367 | // The string we are getting a value from. | |
10368 | Expression* string_; | |
10369 | // The start or only index. | |
10370 | Expression* start_; | |
10371 | // The end index of a slice. This may be NULL for a single index, | |
10372 | // or it may be a nil expression for the length of the string. | |
10373 | Expression* end_; | |
10374 | }; | |
10375 | ||
10376 | // String index traversal. | |
10377 | ||
10378 | int | |
10379 | String_index_expression::do_traverse(Traverse* traverse) | |
10380 | { | |
10381 | if (Expression::traverse(&this->string_, traverse) == TRAVERSE_EXIT) | |
10382 | return TRAVERSE_EXIT; | |
10383 | if (Expression::traverse(&this->start_, traverse) == TRAVERSE_EXIT) | |
10384 | return TRAVERSE_EXIT; | |
10385 | if (this->end_ != NULL) | |
10386 | { | |
10387 | if (Expression::traverse(&this->end_, traverse) == TRAVERSE_EXIT) | |
10388 | return TRAVERSE_EXIT; | |
10389 | } | |
10390 | return TRAVERSE_CONTINUE; | |
10391 | } | |
10392 | ||
2c809f8f | 10393 | Expression* |
10394 | String_index_expression::do_flatten(Gogo*, Named_object*, | |
10395 | Statement_inserter* inserter) | |
e440a328 | 10396 | { |
2c809f8f | 10397 | Location loc = this->location(); |
5bf8be8b | 10398 | Expression* string = this->string_; |
10399 | Expression* start = this->start_; | |
10400 | Expression* end = this->end_; | |
10401 | if (string->is_error_expression() | |
10402 | || string->type()->is_error_type() | |
10403 | || start->is_error_expression() | |
10404 | || start->type()->is_error_type() | |
10405 | || (end != NULL | |
10406 | && (end->is_error_expression() || end->type()->is_error_type()))) | |
10407 | { | |
10408 | go_assert(saw_errors()); | |
10409 | return Expression::make_error(loc); | |
10410 | } | |
10411 | ||
10412 | Temporary_statement* temp; | |
2c809f8f | 10413 | if (!this->string_->is_variable()) |
10414 | { | |
10415 | temp = Statement::make_temporary(NULL, this->string_, loc); | |
10416 | inserter->insert(temp); | |
10417 | this->string_ = Expression::make_temporary_reference(temp, loc); | |
10418 | } | |
10419 | if (!this->start_->is_variable()) | |
10420 | { | |
10421 | temp = Statement::make_temporary(NULL, this->start_, loc); | |
10422 | inserter->insert(temp); | |
10423 | this->start_ = Expression::make_temporary_reference(temp, loc); | |
10424 | } | |
10425 | if (this->end_ != NULL | |
10426 | && !this->end_->is_nil_expression() | |
10427 | && !this->end_->is_variable()) | |
10428 | { | |
10429 | temp = Statement::make_temporary(NULL, this->end_, loc); | |
10430 | inserter->insert(temp); | |
10431 | this->end_ = Expression::make_temporary_reference(temp, loc); | |
10432 | } | |
10433 | ||
10434 | return this; | |
10435 | } | |
10436 | ||
10437 | // Return the type of a string index. | |
10438 | ||
10439 | Type* | |
10440 | String_index_expression::do_type() | |
10441 | { | |
10442 | if (this->end_ == NULL) | |
10443 | return Type::lookup_integer_type("uint8"); | |
10444 | else | |
10445 | return this->string_->type(); | |
10446 | } | |
10447 | ||
10448 | // Determine the type of a string index. | |
10449 | ||
10450 | void | |
10451 | String_index_expression::do_determine_type(const Type_context*) | |
10452 | { | |
10453 | this->string_->determine_type_no_context(); | |
f77aa642 | 10454 | |
10455 | Type_context index_context(Type::lookup_integer_type("int"), false); | |
10456 | if (this->start_->is_constant()) | |
10457 | this->start_->determine_type(&index_context); | |
10458 | else | |
10459 | this->start_->determine_type_no_context(); | |
e440a328 | 10460 | if (this->end_ != NULL) |
f77aa642 | 10461 | { |
10462 | if (this->end_->is_constant()) | |
10463 | this->end_->determine_type(&index_context); | |
10464 | else | |
10465 | this->end_->determine_type_no_context(); | |
10466 | } | |
e440a328 | 10467 | } |
10468 | ||
10469 | // Check types of a string index. | |
10470 | ||
10471 | void | |
10472 | String_index_expression::do_check_types(Gogo*) | |
10473 | { | |
acdc230d | 10474 | Numeric_constant nc; |
10475 | unsigned long v; | |
10476 | if (this->start_->type()->integer_type() == NULL | |
10477 | && !this->start_->type()->is_error() | |
10478 | && (!this->start_->numeric_constant_value(&nc) | |
10479 | || nc.to_unsigned_long(&v) == Numeric_constant::NC_UL_NOTINT)) | |
e440a328 | 10480 | this->report_error(_("index must be integer")); |
10481 | if (this->end_ != NULL | |
10482 | && this->end_->type()->integer_type() == NULL | |
acdc230d | 10483 | && !this->end_->type()->is_error() |
10484 | && !this->end_->is_nil_expression() | |
10485 | && !this->end_->is_error_expression() | |
10486 | && (!this->end_->numeric_constant_value(&nc) | |
10487 | || nc.to_unsigned_long(&v) == Numeric_constant::NC_UL_NOTINT)) | |
e440a328 | 10488 | this->report_error(_("slice end must be integer")); |
10489 | ||
10490 | std::string sval; | |
10491 | bool sval_valid = this->string_->string_constant_value(&sval); | |
10492 | ||
0c77715b | 10493 | Numeric_constant inc; |
e440a328 | 10494 | mpz_t ival; |
0bd5d859 | 10495 | bool ival_valid = false; |
0c77715b | 10496 | if (this->start_->numeric_constant_value(&inc) && inc.to_int(&ival)) |
e440a328 | 10497 | { |
0bd5d859 | 10498 | ival_valid = true; |
e440a328 | 10499 | if (mpz_sgn(ival) < 0 |
b10f32fb | 10500 | || (sval_valid |
10501 | && (this->end_ == NULL | |
10502 | ? mpz_cmp_ui(ival, sval.length()) >= 0 | |
10503 | : mpz_cmp_ui(ival, sval.length()) > 0))) | |
e440a328 | 10504 | { |
10505 | error_at(this->start_->location(), "string index out of bounds"); | |
10506 | this->set_is_error(); | |
10507 | } | |
10508 | } | |
10509 | if (this->end_ != NULL && !this->end_->is_nil_expression()) | |
10510 | { | |
0c77715b | 10511 | Numeric_constant enc; |
10512 | mpz_t eval; | |
10513 | if (this->end_->numeric_constant_value(&enc) && enc.to_int(&eval)) | |
e440a328 | 10514 | { |
0c77715b | 10515 | if (mpz_sgn(eval) < 0 |
10516 | || (sval_valid && mpz_cmp_ui(eval, sval.length()) > 0)) | |
e440a328 | 10517 | { |
10518 | error_at(this->end_->location(), "string index out of bounds"); | |
10519 | this->set_is_error(); | |
10520 | } | |
0bd5d859 | 10521 | else if (ival_valid && mpz_cmp(ival, eval) > 0) |
10522 | this->report_error(_("inverted slice range")); | |
0c77715b | 10523 | mpz_clear(eval); |
e440a328 | 10524 | } |
10525 | } | |
0bd5d859 | 10526 | if (ival_valid) |
10527 | mpz_clear(ival); | |
e440a328 | 10528 | } |
10529 | ||
ea664253 | 10530 | // Get the backend representation for a string index. |
e440a328 | 10531 | |
ea664253 | 10532 | Bexpression* |
10533 | String_index_expression::do_get_backend(Translate_context* context) | |
e440a328 | 10534 | { |
b13c66cd | 10535 | Location loc = this->location(); |
2c809f8f | 10536 | Expression* string_arg = this->string_; |
10537 | if (this->string_->type()->points_to() != NULL) | |
10538 | string_arg = Expression::make_unary(OPERATOR_MULT, this->string_, loc); | |
e440a328 | 10539 | |
2c809f8f | 10540 | Expression* bad_index = Expression::check_bounds(this->start_, loc); |
e440a328 | 10541 | |
2c809f8f | 10542 | int code = (this->end_ == NULL |
10543 | ? RUNTIME_ERROR_STRING_INDEX_OUT_OF_BOUNDS | |
10544 | : RUNTIME_ERROR_STRING_SLICE_OUT_OF_BOUNDS); | |
e440a328 | 10545 | |
2c809f8f | 10546 | Gogo* gogo = context->gogo(); |
ea664253 | 10547 | Bexpression* crash = gogo->runtime_error(code, loc)->get_backend(context); |
1b1f2abf | 10548 | |
10549 | Type* int_type = Type::lookup_integer_type("int"); | |
e440a328 | 10550 | |
2c809f8f | 10551 | // It is possible that an error occurred earlier because the start index |
10552 | // cannot be represented as an integer type. In this case, we shouldn't | |
10553 | // try casting the starting index into an integer since | |
10554 | // Type_conversion_expression will fail to get the backend representation. | |
10555 | // FIXME. | |
10556 | if (this->start_->type()->integer_type() == NULL | |
10557 | && !Type::are_convertible(int_type, this->start_->type(), NULL)) | |
10558 | { | |
10559 | go_assert(saw_errors()); | |
ea664253 | 10560 | return context->backend()->error_expression(); |
2c809f8f | 10561 | } |
e440a328 | 10562 | |
2c809f8f | 10563 | Expression* start = Expression::make_cast(int_type, this->start_, loc); |
e440a328 | 10564 | |
2c809f8f | 10565 | if (this->end_ == NULL) |
10566 | { | |
10567 | Expression* length = | |
10568 | Expression::make_string_info(this->string_, STRING_INFO_LENGTH, loc); | |
e440a328 | 10569 | |
2c809f8f | 10570 | Expression* start_too_large = |
10571 | Expression::make_binary(OPERATOR_GE, start, length, loc); | |
10572 | bad_index = Expression::make_binary(OPERATOR_OROR, start_too_large, | |
10573 | bad_index, loc); | |
10574 | Expression* bytes = | |
10575 | Expression::make_string_info(this->string_, STRING_INFO_DATA, loc); | |
e440a328 | 10576 | |
ea664253 | 10577 | Bexpression* bstart = start->get_backend(context); |
10578 | Bexpression* ptr = bytes->get_backend(context); | |
2c809f8f | 10579 | ptr = gogo->backend()->pointer_offset_expression(ptr, bstart, loc); |
9b27b43c | 10580 | Btype* ubtype = Type::lookup_integer_type("uint8")->get_backend(gogo); |
10581 | Bexpression* index = | |
10582 | gogo->backend()->indirect_expression(ubtype, ptr, true, loc); | |
e440a328 | 10583 | |
2c809f8f | 10584 | Btype* byte_btype = bytes->type()->points_to()->get_backend(gogo); |
ea664253 | 10585 | Bexpression* index_error = bad_index->get_backend(context); |
10586 | return gogo->backend()->conditional_expression(byte_btype, index_error, | |
10587 | crash, index, loc); | |
2c809f8f | 10588 | } |
10589 | ||
10590 | Expression* end = NULL; | |
10591 | if (this->end_->is_nil_expression()) | |
e67508fa | 10592 | end = Expression::make_integer_sl(-1, int_type, loc); |
e440a328 | 10593 | else |
10594 | { | |
2c809f8f | 10595 | Expression* bounds_check = Expression::check_bounds(this->end_, loc); |
10596 | bad_index = | |
10597 | Expression::make_binary(OPERATOR_OROR, bounds_check, bad_index, loc); | |
10598 | end = Expression::make_cast(int_type, this->end_, loc); | |
e440a328 | 10599 | } |
2c809f8f | 10600 | |
10601 | Expression* strslice = Runtime::make_call(Runtime::STRING_SLICE, loc, 3, | |
10602 | string_arg, start, end); | |
ea664253 | 10603 | Bexpression* bstrslice = strslice->get_backend(context); |
2c809f8f | 10604 | |
10605 | Btype* str_btype = strslice->type()->get_backend(gogo); | |
ea664253 | 10606 | Bexpression* index_error = bad_index->get_backend(context); |
10607 | return gogo->backend()->conditional_expression(str_btype, index_error, | |
10608 | crash, bstrslice, loc); | |
e440a328 | 10609 | } |
10610 | ||
d751bb78 | 10611 | // Dump ast representation for a string index expression. |
10612 | ||
10613 | void | |
10614 | String_index_expression::do_dump_expression(Ast_dump_context* ast_dump_context) | |
10615 | const | |
10616 | { | |
acf2b673 | 10617 | Index_expression::dump_index_expression(ast_dump_context, this->string_, |
10618 | this->start_, this->end_, NULL); | |
d751bb78 | 10619 | } |
10620 | ||
e440a328 | 10621 | // Make a string index expression. END may be NULL. |
10622 | ||
10623 | Expression* | |
10624 | Expression::make_string_index(Expression* string, Expression* start, | |
b13c66cd | 10625 | Expression* end, Location location) |
e440a328 | 10626 | { |
10627 | return new String_index_expression(string, start, end, location); | |
10628 | } | |
10629 | ||
10630 | // Class Map_index. | |
10631 | ||
10632 | // Get the type of the map. | |
10633 | ||
10634 | Map_type* | |
10635 | Map_index_expression::get_map_type() const | |
10636 | { | |
10637 | Map_type* mt = this->map_->type()->deref()->map_type(); | |
c7524fae | 10638 | if (mt == NULL) |
c484d925 | 10639 | go_assert(saw_errors()); |
e440a328 | 10640 | return mt; |
10641 | } | |
10642 | ||
10643 | // Map index traversal. | |
10644 | ||
10645 | int | |
10646 | Map_index_expression::do_traverse(Traverse* traverse) | |
10647 | { | |
10648 | if (Expression::traverse(&this->map_, traverse) == TRAVERSE_EXIT) | |
10649 | return TRAVERSE_EXIT; | |
10650 | return Expression::traverse(&this->index_, traverse); | |
10651 | } | |
10652 | ||
2c809f8f | 10653 | // We need to pass in a pointer to the key, so flatten the index into a |
10654 | // temporary variable if it isn't already. The value pointer will be | |
10655 | // dereferenced and checked for nil, so flatten into a temporary to avoid | |
10656 | // recomputation. | |
10657 | ||
10658 | Expression* | |
91c0fd76 | 10659 | Map_index_expression::do_flatten(Gogo* gogo, Named_object*, |
2c809f8f | 10660 | Statement_inserter* inserter) |
10661 | { | |
91c0fd76 | 10662 | Location loc = this->location(); |
2c809f8f | 10663 | Map_type* mt = this->get_map_type(); |
5bf8be8b | 10664 | if (this->index()->is_error_expression() |
10665 | || this->index()->type()->is_error_type() | |
10666 | || mt->is_error_type()) | |
10667 | { | |
10668 | go_assert(saw_errors()); | |
10669 | return Expression::make_error(loc); | |
10670 | } | |
10671 | ||
91c0fd76 | 10672 | if (!Type::are_identical(mt->key_type(), this->index_->type(), false, NULL)) |
10673 | { | |
10674 | if (this->index_->type()->interface_type() != NULL | |
10675 | && !this->index_->is_variable()) | |
10676 | { | |
10677 | Temporary_statement* temp = | |
10678 | Statement::make_temporary(NULL, this->index_, loc); | |
10679 | inserter->insert(temp); | |
10680 | this->index_ = Expression::make_temporary_reference(temp, loc); | |
10681 | } | |
10682 | this->index_ = Expression::convert_for_assignment(gogo, mt->key_type(), | |
10683 | this->index_, loc); | |
10684 | } | |
2c809f8f | 10685 | |
10686 | if (!this->index_->is_variable()) | |
10687 | { | |
10688 | Temporary_statement* temp = Statement::make_temporary(NULL, this->index_, | |
91c0fd76 | 10689 | loc); |
2c809f8f | 10690 | inserter->insert(temp); |
91c0fd76 | 10691 | this->index_ = Expression::make_temporary_reference(temp, loc); |
2c809f8f | 10692 | } |
10693 | ||
10694 | if (this->value_pointer_ == NULL) | |
10695 | this->get_value_pointer(this->is_lvalue_); | |
5bf8be8b | 10696 | if (this->value_pointer_->is_error_expression() |
10697 | || this->value_pointer_->type()->is_error_type()) | |
10698 | return Expression::make_error(loc); | |
2c809f8f | 10699 | if (!this->value_pointer_->is_variable()) |
10700 | { | |
10701 | Temporary_statement* temp = | |
91c0fd76 | 10702 | Statement::make_temporary(NULL, this->value_pointer_, loc); |
2c809f8f | 10703 | inserter->insert(temp); |
91c0fd76 | 10704 | this->value_pointer_ = Expression::make_temporary_reference(temp, loc); |
2c809f8f | 10705 | } |
10706 | ||
10707 | return this; | |
10708 | } | |
10709 | ||
e440a328 | 10710 | // Return the type of a map index. |
10711 | ||
10712 | Type* | |
10713 | Map_index_expression::do_type() | |
10714 | { | |
c7524fae | 10715 | Map_type* mt = this->get_map_type(); |
10716 | if (mt == NULL) | |
10717 | return Type::make_error_type(); | |
10718 | Type* type = mt->val_type(); | |
e440a328 | 10719 | // If this map index is in a tuple assignment, we actually return a |
10720 | // pointer to the value type. Tuple_map_assignment_statement is | |
10721 | // responsible for handling this correctly. We need to get the type | |
10722 | // right in case this gets assigned to a temporary variable. | |
10723 | if (this->is_in_tuple_assignment_) | |
10724 | type = Type::make_pointer_type(type); | |
10725 | return type; | |
10726 | } | |
10727 | ||
10728 | // Fix the type of a map index. | |
10729 | ||
10730 | void | |
10731 | Map_index_expression::do_determine_type(const Type_context*) | |
10732 | { | |
10733 | this->map_->determine_type_no_context(); | |
c7524fae | 10734 | Map_type* mt = this->get_map_type(); |
10735 | Type* key_type = mt == NULL ? NULL : mt->key_type(); | |
10736 | Type_context subcontext(key_type, false); | |
e440a328 | 10737 | this->index_->determine_type(&subcontext); |
10738 | } | |
10739 | ||
10740 | // Check types of a map index. | |
10741 | ||
10742 | void | |
10743 | Map_index_expression::do_check_types(Gogo*) | |
10744 | { | |
10745 | std::string reason; | |
c7524fae | 10746 | Map_type* mt = this->get_map_type(); |
10747 | if (mt == NULL) | |
10748 | return; | |
10749 | if (!Type::are_assignable(mt->key_type(), this->index_->type(), &reason)) | |
e440a328 | 10750 | { |
10751 | if (reason.empty()) | |
10752 | this->report_error(_("incompatible type for map index")); | |
10753 | else | |
10754 | { | |
10755 | error_at(this->location(), "incompatible type for map index (%s)", | |
10756 | reason.c_str()); | |
10757 | this->set_is_error(); | |
10758 | } | |
10759 | } | |
10760 | } | |
10761 | ||
ea664253 | 10762 | // Get the backend representation for a map index. |
e440a328 | 10763 | |
ea664253 | 10764 | Bexpression* |
10765 | Map_index_expression::do_get_backend(Translate_context* context) | |
e440a328 | 10766 | { |
10767 | Map_type* type = this->get_map_type(); | |
c7524fae | 10768 | if (type == NULL) |
2c809f8f | 10769 | { |
10770 | go_assert(saw_errors()); | |
ea664253 | 10771 | return context->backend()->error_expression(); |
2c809f8f | 10772 | } |
e440a328 | 10773 | |
2c809f8f | 10774 | go_assert(this->value_pointer_ != NULL |
10775 | && this->value_pointer_->is_variable()); | |
e440a328 | 10776 | |
2c809f8f | 10777 | Bexpression* ret; |
e440a328 | 10778 | if (this->is_lvalue_) |
2c809f8f | 10779 | { |
10780 | Expression* val = | |
10781 | Expression::make_unary(OPERATOR_MULT, this->value_pointer_, | |
10782 | this->location()); | |
ea664253 | 10783 | ret = val->get_backend(context); |
2c809f8f | 10784 | } |
e440a328 | 10785 | else if (this->is_in_tuple_assignment_) |
10786 | { | |
10787 | // Tuple_map_assignment_statement is responsible for using this | |
10788 | // appropriately. | |
ea664253 | 10789 | ret = this->value_pointer_->get_backend(context); |
e440a328 | 10790 | } |
10791 | else | |
10792 | { | |
2c809f8f | 10793 | Location loc = this->location(); |
10794 | ||
10795 | Expression* nil_check = | |
10796 | Expression::make_binary(OPERATOR_EQEQ, this->value_pointer_, | |
10797 | Expression::make_nil(loc), loc); | |
ea664253 | 10798 | Bexpression* bnil_check = nil_check->get_backend(context); |
2c809f8f | 10799 | Expression* val = |
10800 | Expression::make_unary(OPERATOR_MULT, this->value_pointer_, loc); | |
ea664253 | 10801 | Bexpression* bval = val->get_backend(context); |
2c809f8f | 10802 | |
63697958 | 10803 | Gogo* gogo = context->gogo(); |
10804 | Btype* val_btype = type->val_type()->get_backend(gogo); | |
10805 | Bexpression* val_zero = gogo->backend()->zero_expression(val_btype); | |
2c809f8f | 10806 | ret = gogo->backend()->conditional_expression(val_btype, bnil_check, |
10807 | val_zero, bval, loc); | |
e440a328 | 10808 | } |
ea664253 | 10809 | return ret; |
e440a328 | 10810 | } |
10811 | ||
2c809f8f | 10812 | // Get an expression for the map index. This returns an expression which |
10813 | // evaluates to a pointer to a value. The pointer will be NULL if the key is | |
e440a328 | 10814 | // not in the map. |
10815 | ||
2c809f8f | 10816 | Expression* |
10817 | Map_index_expression::get_value_pointer(bool insert) | |
e440a328 | 10818 | { |
2c809f8f | 10819 | if (this->value_pointer_ == NULL) |
746d2e73 | 10820 | { |
2c809f8f | 10821 | Map_type* type = this->get_map_type(); |
10822 | if (type == NULL) | |
746d2e73 | 10823 | { |
2c809f8f | 10824 | go_assert(saw_errors()); |
10825 | return Expression::make_error(this->location()); | |
746d2e73 | 10826 | } |
e440a328 | 10827 | |
2c809f8f | 10828 | Location loc = this->location(); |
10829 | Expression* map_ref = this->map_; | |
10830 | if (this->map_->type()->points_to() != NULL) | |
10831 | map_ref = Expression::make_unary(OPERATOR_MULT, map_ref, loc); | |
e440a328 | 10832 | |
2c809f8f | 10833 | Expression* index_ptr = Expression::make_unary(OPERATOR_AND, this->index_, |
10834 | loc); | |
10835 | Expression* map_index = | |
10836 | Runtime::make_call(Runtime::MAP_INDEX, loc, 3, | |
10837 | map_ref, index_ptr, | |
10838 | Expression::make_boolean(insert, loc)); | |
10839 | ||
10840 | Type* val_type = type->val_type(); | |
10841 | this->value_pointer_ = | |
10842 | Expression::make_unsafe_cast(Type::make_pointer_type(val_type), | |
10843 | map_index, this->location()); | |
10844 | } | |
10845 | return this->value_pointer_; | |
e440a328 | 10846 | } |
10847 | ||
d751bb78 | 10848 | // Dump ast representation for a map index expression |
10849 | ||
10850 | void | |
10851 | Map_index_expression::do_dump_expression(Ast_dump_context* ast_dump_context) | |
10852 | const | |
10853 | { | |
acf2b673 | 10854 | Index_expression::dump_index_expression(ast_dump_context, this->map_, |
10855 | this->index_, NULL, NULL); | |
d751bb78 | 10856 | } |
10857 | ||
e440a328 | 10858 | // Make a map index expression. |
10859 | ||
10860 | Map_index_expression* | |
10861 | Expression::make_map_index(Expression* map, Expression* index, | |
b13c66cd | 10862 | Location location) |
e440a328 | 10863 | { |
10864 | return new Map_index_expression(map, index, location); | |
10865 | } | |
10866 | ||
10867 | // Class Field_reference_expression. | |
10868 | ||
149eabc5 | 10869 | // Lower a field reference expression. There is nothing to lower, but |
10870 | // this is where we generate the tracking information for fields with | |
10871 | // the magic go:"track" tag. | |
10872 | ||
10873 | Expression* | |
10874 | Field_reference_expression::do_lower(Gogo* gogo, Named_object* function, | |
10875 | Statement_inserter* inserter, int) | |
10876 | { | |
10877 | Struct_type* struct_type = this->expr_->type()->struct_type(); | |
10878 | if (struct_type == NULL) | |
10879 | { | |
10880 | // Error will be reported elsewhere. | |
10881 | return this; | |
10882 | } | |
10883 | const Struct_field* field = struct_type->field(this->field_index_); | |
10884 | if (field == NULL) | |
10885 | return this; | |
10886 | if (!field->has_tag()) | |
10887 | return this; | |
10888 | if (field->tag().find("go:\"track\"") == std::string::npos) | |
10889 | return this; | |
10890 | ||
604e278d | 10891 | // References from functions generated by the compiler don't count. |
c6292d1d | 10892 | if (function != NULL && function->func_value()->is_type_specific_function()) |
604e278d | 10893 | return this; |
10894 | ||
149eabc5 | 10895 | // We have found a reference to a tracked field. Build a call to |
10896 | // the runtime function __go_fieldtrack with a string that describes | |
10897 | // the field. FIXME: We should only call this once per referenced | |
10898 | // field per function, not once for each reference to the field. | |
10899 | ||
10900 | if (this->called_fieldtrack_) | |
10901 | return this; | |
10902 | this->called_fieldtrack_ = true; | |
10903 | ||
10904 | Location loc = this->location(); | |
10905 | ||
10906 | std::string s = "fieldtrack \""; | |
10907 | Named_type* nt = this->expr_->type()->named_type(); | |
10908 | if (nt == NULL || nt->named_object()->package() == NULL) | |
10909 | s.append(gogo->pkgpath()); | |
10910 | else | |
10911 | s.append(nt->named_object()->package()->pkgpath()); | |
10912 | s.push_back('.'); | |
10913 | if (nt != NULL) | |
5c29ad36 | 10914 | s.append(Gogo::unpack_hidden_name(nt->name())); |
149eabc5 | 10915 | s.push_back('.'); |
10916 | s.append(field->field_name()); | |
10917 | s.push_back('"'); | |
10918 | ||
10919 | // We can't use a string here, because internally a string holds a | |
10920 | // pointer to the actual bytes; when the linker garbage collects the | |
10921 | // string, it won't garbage collect the bytes. So we use a | |
10922 | // [...]byte. | |
10923 | ||
e67508fa | 10924 | Expression* length_expr = Expression::make_integer_ul(s.length(), NULL, loc); |
149eabc5 | 10925 | |
10926 | Type* byte_type = gogo->lookup_global("byte")->type_value(); | |
10927 | Type* array_type = Type::make_array_type(byte_type, length_expr); | |
10928 | ||
10929 | Expression_list* bytes = new Expression_list(); | |
10930 | for (std::string::const_iterator p = s.begin(); p != s.end(); p++) | |
10931 | { | |
e67508fa | 10932 | unsigned char c = static_cast<unsigned char>(*p); |
10933 | bytes->push_back(Expression::make_integer_ul(c, NULL, loc)); | |
149eabc5 | 10934 | } |
10935 | ||
10936 | Expression* e = Expression::make_composite_literal(array_type, 0, false, | |
62750cd5 | 10937 | bytes, false, loc); |
149eabc5 | 10938 | |
10939 | Variable* var = new Variable(array_type, e, true, false, false, loc); | |
10940 | ||
10941 | static int count; | |
10942 | char buf[50]; | |
10943 | snprintf(buf, sizeof buf, "fieldtrack.%d", count); | |
10944 | ++count; | |
10945 | ||
10946 | Named_object* no = gogo->add_variable(buf, var); | |
10947 | e = Expression::make_var_reference(no, loc); | |
10948 | e = Expression::make_unary(OPERATOR_AND, e, loc); | |
10949 | ||
10950 | Expression* call = Runtime::make_call(Runtime::FIELDTRACK, loc, 1, e); | |
604e278d | 10951 | gogo->lower_expression(function, inserter, &call); |
149eabc5 | 10952 | inserter->insert(Statement::make_statement(call, false)); |
10953 | ||
10954 | // Put this function, and the global variable we just created, into | |
10955 | // unique sections. This will permit the linker to garbage collect | |
10956 | // them if they are not referenced. The effect is that the only | |
10957 | // strings, indicating field references, that will wind up in the | |
10958 | // executable will be those for functions that are actually needed. | |
66a6be58 | 10959 | if (function != NULL) |
10960 | function->func_value()->set_in_unique_section(); | |
149eabc5 | 10961 | var->set_in_unique_section(); |
10962 | ||
10963 | return this; | |
10964 | } | |
10965 | ||
e440a328 | 10966 | // Return the type of a field reference. |
10967 | ||
10968 | Type* | |
10969 | Field_reference_expression::do_type() | |
10970 | { | |
b0e628fb | 10971 | Type* type = this->expr_->type(); |
5c13bd80 | 10972 | if (type->is_error()) |
b0e628fb | 10973 | return type; |
10974 | Struct_type* struct_type = type->struct_type(); | |
c484d925 | 10975 | go_assert(struct_type != NULL); |
e440a328 | 10976 | return struct_type->field(this->field_index_)->type(); |
10977 | } | |
10978 | ||
10979 | // Check the types for a field reference. | |
10980 | ||
10981 | void | |
10982 | Field_reference_expression::do_check_types(Gogo*) | |
10983 | { | |
b0e628fb | 10984 | Type* type = this->expr_->type(); |
5c13bd80 | 10985 | if (type->is_error()) |
b0e628fb | 10986 | return; |
10987 | Struct_type* struct_type = type->struct_type(); | |
c484d925 | 10988 | go_assert(struct_type != NULL); |
10989 | go_assert(struct_type->field(this->field_index_) != NULL); | |
e440a328 | 10990 | } |
10991 | ||
ea664253 | 10992 | // Get the backend representation for a field reference. |
e440a328 | 10993 | |
ea664253 | 10994 | Bexpression* |
10995 | Field_reference_expression::do_get_backend(Translate_context* context) | |
e440a328 | 10996 | { |
ea664253 | 10997 | Bexpression* bstruct = this->expr_->get_backend(context); |
10998 | return context->gogo()->backend()->struct_field_expression(bstruct, | |
10999 | this->field_index_, | |
11000 | this->location()); | |
e440a328 | 11001 | } |
11002 | ||
d751bb78 | 11003 | // Dump ast representation for a field reference expression. |
11004 | ||
11005 | void | |
11006 | Field_reference_expression::do_dump_expression( | |
11007 | Ast_dump_context* ast_dump_context) const | |
11008 | { | |
11009 | this->expr_->dump_expression(ast_dump_context); | |
11010 | ast_dump_context->ostream() << "." << this->field_index_; | |
11011 | } | |
11012 | ||
e440a328 | 11013 | // Make a reference to a qualified identifier in an expression. |
11014 | ||
11015 | Field_reference_expression* | |
11016 | Expression::make_field_reference(Expression* expr, unsigned int field_index, | |
b13c66cd | 11017 | Location location) |
e440a328 | 11018 | { |
11019 | return new Field_reference_expression(expr, field_index, location); | |
11020 | } | |
11021 | ||
11022 | // Class Interface_field_reference_expression. | |
11023 | ||
2387f644 | 11024 | // Return an expression for the pointer to the function to call. |
e440a328 | 11025 | |
2387f644 | 11026 | Expression* |
11027 | Interface_field_reference_expression::get_function() | |
e440a328 | 11028 | { |
2387f644 | 11029 | Expression* ref = this->expr_; |
11030 | Location loc = this->location(); | |
11031 | if (ref->type()->points_to() != NULL) | |
11032 | ref = Expression::make_unary(OPERATOR_MULT, ref, loc); | |
e440a328 | 11033 | |
2387f644 | 11034 | Expression* mtable = |
11035 | Expression::make_interface_info(ref, INTERFACE_INFO_METHODS, loc); | |
11036 | Struct_type* mtable_type = mtable->type()->points_to()->struct_type(); | |
e440a328 | 11037 | |
11038 | std::string name = Gogo::unpack_hidden_name(this->name_); | |
2387f644 | 11039 | unsigned int index; |
11040 | const Struct_field* field = mtable_type->find_local_field(name, &index); | |
11041 | go_assert(field != NULL); | |
11042 | mtable = Expression::make_unary(OPERATOR_MULT, mtable, loc); | |
11043 | return Expression::make_field_reference(mtable, index, loc); | |
e440a328 | 11044 | } |
11045 | ||
2387f644 | 11046 | // Return an expression for the first argument to pass to the interface |
e440a328 | 11047 | // function. |
11048 | ||
2387f644 | 11049 | Expression* |
11050 | Interface_field_reference_expression::get_underlying_object() | |
e440a328 | 11051 | { |
2387f644 | 11052 | Expression* expr = this->expr_; |
11053 | if (expr->type()->points_to() != NULL) | |
11054 | expr = Expression::make_unary(OPERATOR_MULT, expr, this->location()); | |
11055 | return Expression::make_interface_info(expr, INTERFACE_INFO_OBJECT, | |
11056 | this->location()); | |
e440a328 | 11057 | } |
11058 | ||
11059 | // Traversal. | |
11060 | ||
11061 | int | |
11062 | Interface_field_reference_expression::do_traverse(Traverse* traverse) | |
11063 | { | |
11064 | return Expression::traverse(&this->expr_, traverse); | |
11065 | } | |
11066 | ||
0afbb937 | 11067 | // Lower the expression. If this expression is not called, we need to |
11068 | // evaluate the expression twice when converting to the backend | |
11069 | // interface. So introduce a temporary variable if necessary. | |
11070 | ||
11071 | Expression* | |
9782d556 | 11072 | Interface_field_reference_expression::do_flatten(Gogo*, Named_object*, |
11073 | Statement_inserter* inserter) | |
0afbb937 | 11074 | { |
5bf8be8b | 11075 | if (this->expr_->is_error_expression() |
11076 | || this->expr_->type()->is_error_type()) | |
11077 | { | |
11078 | go_assert(saw_errors()); | |
11079 | return Expression::make_error(this->location()); | |
11080 | } | |
11081 | ||
2387f644 | 11082 | if (!this->expr_->is_variable()) |
0afbb937 | 11083 | { |
11084 | Temporary_statement* temp = | |
11085 | Statement::make_temporary(this->expr_->type(), NULL, this->location()); | |
11086 | inserter->insert(temp); | |
11087 | this->expr_ = Expression::make_set_and_use_temporary(temp, this->expr_, | |
11088 | this->location()); | |
11089 | } | |
11090 | return this; | |
11091 | } | |
11092 | ||
e440a328 | 11093 | // Return the type of an interface field reference. |
11094 | ||
11095 | Type* | |
11096 | Interface_field_reference_expression::do_type() | |
11097 | { | |
11098 | Type* expr_type = this->expr_->type(); | |
11099 | ||
11100 | Type* points_to = expr_type->points_to(); | |
11101 | if (points_to != NULL) | |
11102 | expr_type = points_to; | |
11103 | ||
11104 | Interface_type* interface_type = expr_type->interface_type(); | |
11105 | if (interface_type == NULL) | |
11106 | return Type::make_error_type(); | |
11107 | ||
11108 | const Typed_identifier* method = interface_type->find_method(this->name_); | |
11109 | if (method == NULL) | |
11110 | return Type::make_error_type(); | |
11111 | ||
11112 | return method->type(); | |
11113 | } | |
11114 | ||
11115 | // Determine types. | |
11116 | ||
11117 | void | |
11118 | Interface_field_reference_expression::do_determine_type(const Type_context*) | |
11119 | { | |
11120 | this->expr_->determine_type_no_context(); | |
11121 | } | |
11122 | ||
11123 | // Check the types for an interface field reference. | |
11124 | ||
11125 | void | |
11126 | Interface_field_reference_expression::do_check_types(Gogo*) | |
11127 | { | |
11128 | Type* type = this->expr_->type(); | |
11129 | ||
11130 | Type* points_to = type->points_to(); | |
11131 | if (points_to != NULL) | |
11132 | type = points_to; | |
11133 | ||
11134 | Interface_type* interface_type = type->interface_type(); | |
11135 | if (interface_type == NULL) | |
5c491127 | 11136 | { |
11137 | if (!type->is_error_type()) | |
11138 | this->report_error(_("expected interface or pointer to interface")); | |
11139 | } | |
e440a328 | 11140 | else |
11141 | { | |
11142 | const Typed_identifier* method = | |
11143 | interface_type->find_method(this->name_); | |
11144 | if (method == NULL) | |
11145 | { | |
11146 | error_at(this->location(), "method %qs not in interface", | |
11147 | Gogo::message_name(this->name_).c_str()); | |
11148 | this->set_is_error(); | |
11149 | } | |
11150 | } | |
11151 | } | |
11152 | ||
0afbb937 | 11153 | // If an interface field reference is not simply called, then it is |
11154 | // represented as a closure. The closure will hold a single variable, | |
11155 | // the value of the interface on which the method should be called. | |
11156 | // The function will be a simple thunk that pulls the value from the | |
11157 | // closure and calls the method with the remaining arguments. | |
11158 | ||
11159 | // Because method values are not common, we don't build all thunks for | |
11160 | // all possible interface methods, but instead only build them as we | |
11161 | // need them. In particular, we even build them on demand for | |
11162 | // interface methods defined in other packages. | |
11163 | ||
11164 | Interface_field_reference_expression::Interface_method_thunks | |
11165 | Interface_field_reference_expression::interface_method_thunks; | |
11166 | ||
11167 | // Find or create the thunk to call method NAME on TYPE. | |
11168 | ||
11169 | Named_object* | |
11170 | Interface_field_reference_expression::create_thunk(Gogo* gogo, | |
11171 | Interface_type* type, | |
11172 | const std::string& name) | |
11173 | { | |
11174 | std::pair<Interface_type*, Method_thunks*> val(type, NULL); | |
11175 | std::pair<Interface_method_thunks::iterator, bool> ins = | |
11176 | Interface_field_reference_expression::interface_method_thunks.insert(val); | |
11177 | if (ins.second) | |
11178 | { | |
11179 | // This is the first time we have seen this interface. | |
11180 | ins.first->second = new Method_thunks(); | |
11181 | } | |
11182 | ||
11183 | for (Method_thunks::const_iterator p = ins.first->second->begin(); | |
11184 | p != ins.first->second->end(); | |
11185 | p++) | |
11186 | if (p->first == name) | |
11187 | return p->second; | |
11188 | ||
11189 | Location loc = type->location(); | |
11190 | ||
11191 | const Typed_identifier* method_id = type->find_method(name); | |
11192 | if (method_id == NULL) | |
11193 | return Named_object::make_erroneous_name(Gogo::thunk_name()); | |
11194 | ||
11195 | Function_type* orig_fntype = method_id->type()->function_type(); | |
11196 | if (orig_fntype == NULL) | |
11197 | return Named_object::make_erroneous_name(Gogo::thunk_name()); | |
11198 | ||
11199 | Struct_field_list* sfl = new Struct_field_list(); | |
f8bdf81a | 11200 | // The type here is wrong--it should be the C function type. But it |
11201 | // doesn't really matter. | |
0afbb937 | 11202 | Type* vt = Type::make_pointer_type(Type::make_void_type()); |
11203 | sfl->push_back(Struct_field(Typed_identifier("fn.0", vt, loc))); | |
11204 | sfl->push_back(Struct_field(Typed_identifier("val.1", type, loc))); | |
11205 | Type* closure_type = Type::make_struct_type(sfl, loc); | |
11206 | closure_type = Type::make_pointer_type(closure_type); | |
11207 | ||
f8bdf81a | 11208 | Function_type* new_fntype = orig_fntype->copy_with_names(); |
0afbb937 | 11209 | |
da244e59 | 11210 | std::string thunk_name = Gogo::thunk_name(); |
11211 | Named_object* new_no = gogo->start_function(thunk_name, new_fntype, | |
0afbb937 | 11212 | false, loc); |
11213 | ||
f8bdf81a | 11214 | Variable* cvar = new Variable(closure_type, NULL, false, false, false, loc); |
11215 | cvar->set_is_used(); | |
1ecc6157 | 11216 | cvar->set_is_closure(); |
da244e59 | 11217 | Named_object* cp = Named_object::make_variable("$closure" + thunk_name, |
11218 | NULL, cvar); | |
f8bdf81a | 11219 | new_no->func_value()->set_closure_var(cp); |
0afbb937 | 11220 | |
f8bdf81a | 11221 | gogo->start_block(loc); |
0afbb937 | 11222 | |
11223 | // Field 0 of the closure is the function code pointer, field 1 is | |
11224 | // the value on which to invoke the method. | |
11225 | Expression* arg = Expression::make_var_reference(cp, loc); | |
11226 | arg = Expression::make_unary(OPERATOR_MULT, arg, loc); | |
11227 | arg = Expression::make_field_reference(arg, 1, loc); | |
11228 | ||
11229 | Expression *ifre = Expression::make_interface_field_reference(arg, name, | |
11230 | loc); | |
11231 | ||
11232 | const Typed_identifier_list* orig_params = orig_fntype->parameters(); | |
11233 | Expression_list* args; | |
11234 | if (orig_params == NULL || orig_params->empty()) | |
11235 | args = NULL; | |
11236 | else | |
11237 | { | |
11238 | const Typed_identifier_list* new_params = new_fntype->parameters(); | |
11239 | args = new Expression_list(); | |
11240 | for (Typed_identifier_list::const_iterator p = new_params->begin(); | |
f8bdf81a | 11241 | p != new_params->end(); |
0afbb937 | 11242 | ++p) |
11243 | { | |
11244 | Named_object* p_no = gogo->lookup(p->name(), NULL); | |
11245 | go_assert(p_no != NULL | |
11246 | && p_no->is_variable() | |
11247 | && p_no->var_value()->is_parameter()); | |
11248 | args->push_back(Expression::make_var_reference(p_no, loc)); | |
11249 | } | |
11250 | } | |
11251 | ||
11252 | Call_expression* call = Expression::make_call(ifre, args, | |
11253 | orig_fntype->is_varargs(), | |
11254 | loc); | |
11255 | call->set_varargs_are_lowered(); | |
11256 | ||
11257 | Statement* s = Statement::make_return_from_call(call, loc); | |
11258 | gogo->add_statement(s); | |
11259 | Block* b = gogo->finish_block(loc); | |
11260 | gogo->add_block(b, loc); | |
11261 | gogo->lower_block(new_no, b); | |
a32698ee | 11262 | gogo->flatten_block(new_no, b); |
0afbb937 | 11263 | gogo->finish_function(loc); |
11264 | ||
11265 | ins.first->second->push_back(std::make_pair(name, new_no)); | |
11266 | return new_no; | |
11267 | } | |
11268 | ||
ea664253 | 11269 | // Get the backend representation for a method value. |
e440a328 | 11270 | |
ea664253 | 11271 | Bexpression* |
11272 | Interface_field_reference_expression::do_get_backend(Translate_context* context) | |
e440a328 | 11273 | { |
0afbb937 | 11274 | Interface_type* type = this->expr_->type()->interface_type(); |
11275 | if (type == NULL) | |
11276 | { | |
11277 | go_assert(saw_errors()); | |
ea664253 | 11278 | return context->backend()->error_expression(); |
0afbb937 | 11279 | } |
11280 | ||
11281 | Named_object* thunk = | |
11282 | Interface_field_reference_expression::create_thunk(context->gogo(), | |
11283 | type, this->name_); | |
11284 | if (thunk->is_erroneous()) | |
11285 | { | |
11286 | go_assert(saw_errors()); | |
ea664253 | 11287 | return context->backend()->error_expression(); |
0afbb937 | 11288 | } |
11289 | ||
11290 | // FIXME: We should lower this earlier, but we can't it lower it in | |
11291 | // the lowering pass because at that point we don't know whether we | |
11292 | // need to create the thunk or not. If the expression is called, we | |
11293 | // don't need the thunk. | |
11294 | ||
11295 | Location loc = this->location(); | |
11296 | ||
11297 | Struct_field_list* fields = new Struct_field_list(); | |
11298 | fields->push_back(Struct_field(Typed_identifier("fn.0", | |
11299 | thunk->func_value()->type(), | |
11300 | loc))); | |
11301 | fields->push_back(Struct_field(Typed_identifier("val.1", | |
11302 | this->expr_->type(), | |
11303 | loc))); | |
11304 | Struct_type* st = Type::make_struct_type(fields, loc); | |
11305 | ||
11306 | Expression_list* vals = new Expression_list(); | |
11307 | vals->push_back(Expression::make_func_code_reference(thunk, loc)); | |
11308 | vals->push_back(this->expr_); | |
11309 | ||
11310 | Expression* expr = Expression::make_struct_composite_literal(st, vals, loc); | |
ea664253 | 11311 | Bexpression* bclosure = |
11312 | Expression::make_heap_expression(expr, loc)->get_backend(context); | |
0afbb937 | 11313 | |
2387f644 | 11314 | Expression* nil_check = |
11315 | Expression::make_binary(OPERATOR_EQEQ, this->expr_, | |
11316 | Expression::make_nil(loc), loc); | |
ea664253 | 11317 | Bexpression* bnil_check = nil_check->get_backend(context); |
0afbb937 | 11318 | |
2387f644 | 11319 | Gogo* gogo = context->gogo(); |
ea664253 | 11320 | Bexpression* bcrash = gogo->runtime_error(RUNTIME_ERROR_NIL_DEREFERENCE, |
11321 | loc)->get_backend(context); | |
2387f644 | 11322 | |
11323 | Bexpression* bcond = | |
a32698ee | 11324 | gogo->backend()->conditional_expression(NULL, bnil_check, bcrash, NULL, loc); |
2387f644 | 11325 | Bstatement* cond_statement = gogo->backend()->expression_statement(bcond); |
ea664253 | 11326 | return gogo->backend()->compound_expression(cond_statement, bclosure, loc); |
e440a328 | 11327 | } |
11328 | ||
d751bb78 | 11329 | // Dump ast representation for an interface field reference. |
11330 | ||
11331 | void | |
11332 | Interface_field_reference_expression::do_dump_expression( | |
11333 | Ast_dump_context* ast_dump_context) const | |
11334 | { | |
11335 | this->expr_->dump_expression(ast_dump_context); | |
11336 | ast_dump_context->ostream() << "." << this->name_; | |
11337 | } | |
11338 | ||
e440a328 | 11339 | // Make a reference to a field in an interface. |
11340 | ||
11341 | Expression* | |
11342 | Expression::make_interface_field_reference(Expression* expr, | |
11343 | const std::string& field, | |
b13c66cd | 11344 | Location location) |
e440a328 | 11345 | { |
11346 | return new Interface_field_reference_expression(expr, field, location); | |
11347 | } | |
11348 | ||
11349 | // A general selector. This is a Parser_expression for LEFT.NAME. It | |
11350 | // is lowered after we know the type of the left hand side. | |
11351 | ||
11352 | class Selector_expression : public Parser_expression | |
11353 | { | |
11354 | public: | |
11355 | Selector_expression(Expression* left, const std::string& name, | |
b13c66cd | 11356 | Location location) |
e440a328 | 11357 | : Parser_expression(EXPRESSION_SELECTOR, location), |
11358 | left_(left), name_(name) | |
11359 | { } | |
11360 | ||
11361 | protected: | |
11362 | int | |
11363 | do_traverse(Traverse* traverse) | |
11364 | { return Expression::traverse(&this->left_, traverse); } | |
11365 | ||
11366 | Expression* | |
ceeb4318 | 11367 | do_lower(Gogo*, Named_object*, Statement_inserter*, int); |
e440a328 | 11368 | |
11369 | Expression* | |
11370 | do_copy() | |
11371 | { | |
11372 | return new Selector_expression(this->left_->copy(), this->name_, | |
11373 | this->location()); | |
11374 | } | |
11375 | ||
d751bb78 | 11376 | void |
11377 | do_dump_expression(Ast_dump_context* ast_dump_context) const; | |
11378 | ||
e440a328 | 11379 | private: |
11380 | Expression* | |
11381 | lower_method_expression(Gogo*); | |
11382 | ||
11383 | // The expression on the left hand side. | |
11384 | Expression* left_; | |
11385 | // The name on the right hand side. | |
11386 | std::string name_; | |
11387 | }; | |
11388 | ||
11389 | // Lower a selector expression once we know the real type of the left | |
11390 | // hand side. | |
11391 | ||
11392 | Expression* | |
ceeb4318 | 11393 | Selector_expression::do_lower(Gogo* gogo, Named_object*, Statement_inserter*, |
11394 | int) | |
e440a328 | 11395 | { |
11396 | Expression* left = this->left_; | |
11397 | if (left->is_type_expression()) | |
11398 | return this->lower_method_expression(gogo); | |
11399 | return Type::bind_field_or_method(gogo, left->type(), left, this->name_, | |
11400 | this->location()); | |
11401 | } | |
11402 | ||
11403 | // Lower a method expression T.M or (*T).M. We turn this into a | |
11404 | // function literal. | |
11405 | ||
11406 | Expression* | |
11407 | Selector_expression::lower_method_expression(Gogo* gogo) | |
11408 | { | |
b13c66cd | 11409 | Location location = this->location(); |
e440a328 | 11410 | Type* type = this->left_->type(); |
11411 | const std::string& name(this->name_); | |
11412 | ||
11413 | bool is_pointer; | |
11414 | if (type->points_to() == NULL) | |
11415 | is_pointer = false; | |
11416 | else | |
11417 | { | |
11418 | is_pointer = true; | |
11419 | type = type->points_to(); | |
11420 | } | |
11421 | Named_type* nt = type->named_type(); | |
11422 | if (nt == NULL) | |
11423 | { | |
11424 | error_at(location, | |
11425 | ("method expression requires named type or " | |
11426 | "pointer to named type")); | |
11427 | return Expression::make_error(location); | |
11428 | } | |
11429 | ||
11430 | bool is_ambiguous; | |
11431 | Method* method = nt->method_function(name, &is_ambiguous); | |
ab1468c3 | 11432 | const Typed_identifier* imethod = NULL; |
dcc8506b | 11433 | if (method == NULL && !is_pointer) |
ab1468c3 | 11434 | { |
11435 | Interface_type* it = nt->interface_type(); | |
11436 | if (it != NULL) | |
11437 | imethod = it->find_method(name); | |
11438 | } | |
11439 | ||
11440 | if (method == NULL && imethod == NULL) | |
e440a328 | 11441 | { |
11442 | if (!is_ambiguous) | |
dcc8506b | 11443 | error_at(location, "type %<%s%s%> has no method %<%s%>", |
11444 | is_pointer ? "*" : "", | |
e440a328 | 11445 | nt->message_name().c_str(), |
11446 | Gogo::message_name(name).c_str()); | |
11447 | else | |
dcc8506b | 11448 | error_at(location, "method %<%s%s%> is ambiguous in type %<%s%>", |
e440a328 | 11449 | Gogo::message_name(name).c_str(), |
dcc8506b | 11450 | is_pointer ? "*" : "", |
e440a328 | 11451 | nt->message_name().c_str()); |
11452 | return Expression::make_error(location); | |
11453 | } | |
11454 | ||
ab1468c3 | 11455 | if (method != NULL && !is_pointer && !method->is_value_method()) |
e440a328 | 11456 | { |
11457 | error_at(location, "method requires pointer (use %<(*%s).%s)%>", | |
11458 | nt->message_name().c_str(), | |
11459 | Gogo::message_name(name).c_str()); | |
11460 | return Expression::make_error(location); | |
11461 | } | |
11462 | ||
11463 | // Build a new function type in which the receiver becomes the first | |
11464 | // argument. | |
ab1468c3 | 11465 | Function_type* method_type; |
11466 | if (method != NULL) | |
11467 | { | |
11468 | method_type = method->type(); | |
c484d925 | 11469 | go_assert(method_type->is_method()); |
ab1468c3 | 11470 | } |
11471 | else | |
11472 | { | |
11473 | method_type = imethod->type()->function_type(); | |
c484d925 | 11474 | go_assert(method_type != NULL && !method_type->is_method()); |
ab1468c3 | 11475 | } |
e440a328 | 11476 | |
11477 | const char* const receiver_name = "$this"; | |
11478 | Typed_identifier_list* parameters = new Typed_identifier_list(); | |
11479 | parameters->push_back(Typed_identifier(receiver_name, this->left_->type(), | |
11480 | location)); | |
11481 | ||
11482 | const Typed_identifier_list* method_parameters = method_type->parameters(); | |
11483 | if (method_parameters != NULL) | |
11484 | { | |
f470da59 | 11485 | int i = 0; |
e440a328 | 11486 | for (Typed_identifier_list::const_iterator p = method_parameters->begin(); |
11487 | p != method_parameters->end(); | |
f470da59 | 11488 | ++p, ++i) |
11489 | { | |
68883531 | 11490 | if (!p->name().empty()) |
f470da59 | 11491 | parameters->push_back(*p); |
11492 | else | |
11493 | { | |
11494 | char buf[20]; | |
11495 | snprintf(buf, sizeof buf, "$param%d", i); | |
11496 | parameters->push_back(Typed_identifier(buf, p->type(), | |
11497 | p->location())); | |
11498 | } | |
11499 | } | |
e440a328 | 11500 | } |
11501 | ||
11502 | const Typed_identifier_list* method_results = method_type->results(); | |
11503 | Typed_identifier_list* results; | |
11504 | if (method_results == NULL) | |
11505 | results = NULL; | |
11506 | else | |
11507 | { | |
11508 | results = new Typed_identifier_list(); | |
11509 | for (Typed_identifier_list::const_iterator p = method_results->begin(); | |
11510 | p != method_results->end(); | |
11511 | ++p) | |
11512 | results->push_back(*p); | |
11513 | } | |
11514 | ||
11515 | Function_type* fntype = Type::make_function_type(NULL, parameters, results, | |
11516 | location); | |
11517 | if (method_type->is_varargs()) | |
11518 | fntype->set_is_varargs(); | |
11519 | ||
11520 | // We generate methods which always takes a pointer to the receiver | |
11521 | // as their first argument. If this is for a pointer type, we can | |
11522 | // simply reuse the existing function. We use an internal hack to | |
11523 | // get the right type. | |
8381eda7 | 11524 | // FIXME: This optimization is disabled because it doesn't yet work |
11525 | // with function descriptors when the method expression is not | |
11526 | // directly called. | |
11527 | if (method != NULL && is_pointer && false) | |
e440a328 | 11528 | { |
11529 | Named_object* mno = (method->needs_stub_method() | |
11530 | ? method->stub_object() | |
11531 | : method->named_object()); | |
11532 | Expression* f = Expression::make_func_reference(mno, NULL, location); | |
11533 | f = Expression::make_cast(fntype, f, location); | |
11534 | Type_conversion_expression* tce = | |
11535 | static_cast<Type_conversion_expression*>(f); | |
11536 | tce->set_may_convert_function_types(); | |
11537 | return f; | |
11538 | } | |
11539 | ||
11540 | Named_object* no = gogo->start_function(Gogo::thunk_name(), fntype, false, | |
11541 | location); | |
11542 | ||
11543 | Named_object* vno = gogo->lookup(receiver_name, NULL); | |
c484d925 | 11544 | go_assert(vno != NULL); |
e440a328 | 11545 | Expression* ve = Expression::make_var_reference(vno, location); |
ab1468c3 | 11546 | Expression* bm; |
11547 | if (method != NULL) | |
11548 | bm = Type::bind_field_or_method(gogo, nt, ve, name, location); | |
11549 | else | |
11550 | bm = Expression::make_interface_field_reference(ve, name, location); | |
f690b0bb | 11551 | |
11552 | // Even though we found the method above, if it has an error type we | |
11553 | // may see an error here. | |
11554 | if (bm->is_error_expression()) | |
463fe805 | 11555 | { |
11556 | gogo->finish_function(location); | |
11557 | return bm; | |
11558 | } | |
e440a328 | 11559 | |
11560 | Expression_list* args; | |
f470da59 | 11561 | if (parameters->size() <= 1) |
e440a328 | 11562 | args = NULL; |
11563 | else | |
11564 | { | |
11565 | args = new Expression_list(); | |
f470da59 | 11566 | Typed_identifier_list::const_iterator p = parameters->begin(); |
11567 | ++p; | |
11568 | for (; p != parameters->end(); ++p) | |
e440a328 | 11569 | { |
11570 | vno = gogo->lookup(p->name(), NULL); | |
c484d925 | 11571 | go_assert(vno != NULL); |
e440a328 | 11572 | args->push_back(Expression::make_var_reference(vno, location)); |
11573 | } | |
11574 | } | |
11575 | ||
ceeb4318 | 11576 | gogo->start_block(location); |
11577 | ||
e440a328 | 11578 | Call_expression* call = Expression::make_call(bm, args, |
11579 | method_type->is_varargs(), | |
11580 | location); | |
11581 | ||
0afbb937 | 11582 | Statement* s = Statement::make_return_from_call(call, location); |
e440a328 | 11583 | gogo->add_statement(s); |
11584 | ||
ceeb4318 | 11585 | Block* b = gogo->finish_block(location); |
11586 | ||
11587 | gogo->add_block(b, location); | |
11588 | ||
11589 | // Lower the call in case there are multiple results. | |
11590 | gogo->lower_block(no, b); | |
a32698ee | 11591 | gogo->flatten_block(no, b); |
ceeb4318 | 11592 | |
e440a328 | 11593 | gogo->finish_function(location); |
11594 | ||
11595 | return Expression::make_func_reference(no, NULL, location); | |
11596 | } | |
11597 | ||
d751bb78 | 11598 | // Dump the ast for a selector expression. |
11599 | ||
11600 | void | |
11601 | Selector_expression::do_dump_expression(Ast_dump_context* ast_dump_context) | |
11602 | const | |
11603 | { | |
11604 | ast_dump_context->dump_expression(this->left_); | |
11605 | ast_dump_context->ostream() << "."; | |
11606 | ast_dump_context->ostream() << this->name_; | |
11607 | } | |
11608 | ||
e440a328 | 11609 | // Make a selector expression. |
11610 | ||
11611 | Expression* | |
11612 | Expression::make_selector(Expression* left, const std::string& name, | |
b13c66cd | 11613 | Location location) |
e440a328 | 11614 | { |
11615 | return new Selector_expression(left, name, location); | |
11616 | } | |
11617 | ||
da244e59 | 11618 | // Class Allocation_expression. |
e440a328 | 11619 | |
da244e59 | 11620 | int |
11621 | Allocation_expression::do_traverse(Traverse* traverse) | |
e440a328 | 11622 | { |
da244e59 | 11623 | return Type::traverse(this->type_, traverse); |
11624 | } | |
e440a328 | 11625 | |
da244e59 | 11626 | Type* |
11627 | Allocation_expression::do_type() | |
11628 | { | |
11629 | return Type::make_pointer_type(this->type_); | |
11630 | } | |
e440a328 | 11631 | |
da244e59 | 11632 | // Make a copy of an allocation expression. |
e440a328 | 11633 | |
da244e59 | 11634 | Expression* |
11635 | Allocation_expression::do_copy() | |
11636 | { | |
11637 | Allocation_expression* alloc = | |
11638 | new Allocation_expression(this->type_, this->location()); | |
11639 | if (this->allocate_on_stack_) | |
11640 | alloc->set_allocate_on_stack(); | |
11641 | return alloc; | |
11642 | } | |
e440a328 | 11643 | |
ea664253 | 11644 | // Return the backend representation for an allocation expression. |
e440a328 | 11645 | |
ea664253 | 11646 | Bexpression* |
11647 | Allocation_expression::do_get_backend(Translate_context* context) | |
e440a328 | 11648 | { |
2c809f8f | 11649 | Gogo* gogo = context->gogo(); |
11650 | Location loc = this->location(); | |
da244e59 | 11651 | |
d5d1c295 | 11652 | if (this->allocate_on_stack_) |
da244e59 | 11653 | { |
2a305b85 | 11654 | int64_t size; |
11655 | bool ok = this->type_->backend_type_size(gogo, &size); | |
11656 | if (!ok) | |
11657 | { | |
11658 | go_assert(saw_errors()); | |
11659 | return gogo->backend()->error_expression(); | |
11660 | } | |
d5d1c295 | 11661 | return gogo->backend()->stack_allocation_expression(size, loc); |
da244e59 | 11662 | } |
11663 | ||
2a305b85 | 11664 | Btype* btype = this->type_->get_backend(gogo); |
11665 | Bexpression* space = | |
ea664253 | 11666 | gogo->allocate_memory(this->type_, loc)->get_backend(context); |
d5d1c295 | 11667 | Btype* pbtype = gogo->backend()->pointer_type(btype); |
ea664253 | 11668 | return gogo->backend()->convert_expression(pbtype, space, loc); |
e440a328 | 11669 | } |
11670 | ||
d751bb78 | 11671 | // Dump ast representation for an allocation expression. |
11672 | ||
11673 | void | |
11674 | Allocation_expression::do_dump_expression(Ast_dump_context* ast_dump_context) | |
11675 | const | |
11676 | { | |
11677 | ast_dump_context->ostream() << "new("; | |
11678 | ast_dump_context->dump_type(this->type_); | |
11679 | ast_dump_context->ostream() << ")"; | |
11680 | } | |
11681 | ||
e440a328 | 11682 | // Make an allocation expression. |
11683 | ||
11684 | Expression* | |
b13c66cd | 11685 | Expression::make_allocation(Type* type, Location location) |
e440a328 | 11686 | { |
11687 | return new Allocation_expression(type, location); | |
11688 | } | |
11689 | ||
da244e59 | 11690 | // Class Struct_construction_expression. |
e440a328 | 11691 | |
11692 | // Traversal. | |
11693 | ||
11694 | int | |
11695 | Struct_construction_expression::do_traverse(Traverse* traverse) | |
11696 | { | |
0c4f5a19 | 11697 | if (this->vals_ != NULL) |
11698 | { | |
11699 | if (this->traverse_order_ == NULL) | |
11700 | { | |
11701 | if (this->vals_->traverse(traverse) == TRAVERSE_EXIT) | |
11702 | return TRAVERSE_EXIT; | |
11703 | } | |
11704 | else | |
11705 | { | |
11706 | for (std::vector<int>::const_iterator p = | |
11707 | this->traverse_order_->begin(); | |
11708 | p != this->traverse_order_->end(); | |
11709 | ++p) | |
11710 | { | |
11711 | if (Expression::traverse(&this->vals_->at(*p), traverse) | |
11712 | == TRAVERSE_EXIT) | |
11713 | return TRAVERSE_EXIT; | |
11714 | } | |
11715 | } | |
11716 | } | |
e440a328 | 11717 | if (Type::traverse(this->type_, traverse) == TRAVERSE_EXIT) |
11718 | return TRAVERSE_EXIT; | |
11719 | return TRAVERSE_CONTINUE; | |
11720 | } | |
11721 | ||
11722 | // Return whether this is a constant initializer. | |
11723 | ||
11724 | bool | |
11725 | Struct_construction_expression::is_constant_struct() const | |
11726 | { | |
11727 | if (this->vals_ == NULL) | |
11728 | return true; | |
11729 | for (Expression_list::const_iterator pv = this->vals_->begin(); | |
11730 | pv != this->vals_->end(); | |
11731 | ++pv) | |
11732 | { | |
11733 | if (*pv != NULL | |
11734 | && !(*pv)->is_constant() | |
11735 | && (!(*pv)->is_composite_literal() | |
11736 | || (*pv)->is_nonconstant_composite_literal())) | |
11737 | return false; | |
11738 | } | |
11739 | ||
11740 | const Struct_field_list* fields = this->type_->struct_type()->fields(); | |
11741 | for (Struct_field_list::const_iterator pf = fields->begin(); | |
11742 | pf != fields->end(); | |
11743 | ++pf) | |
11744 | { | |
11745 | // There are no constant constructors for interfaces. | |
11746 | if (pf->type()->interface_type() != NULL) | |
11747 | return false; | |
11748 | } | |
11749 | ||
11750 | return true; | |
11751 | } | |
11752 | ||
f9ca30f9 | 11753 | // Return whether this struct is immutable. |
11754 | ||
11755 | bool | |
11756 | Struct_construction_expression::do_is_immutable() const | |
11757 | { | |
11758 | if (this->vals_ == NULL) | |
11759 | return true; | |
11760 | for (Expression_list::const_iterator pv = this->vals_->begin(); | |
11761 | pv != this->vals_->end(); | |
11762 | ++pv) | |
11763 | { | |
11764 | if (*pv != NULL && !(*pv)->is_immutable()) | |
11765 | return false; | |
11766 | } | |
11767 | return true; | |
11768 | } | |
11769 | ||
e440a328 | 11770 | // Final type determination. |
11771 | ||
11772 | void | |
11773 | Struct_construction_expression::do_determine_type(const Type_context*) | |
11774 | { | |
11775 | if (this->vals_ == NULL) | |
11776 | return; | |
11777 | const Struct_field_list* fields = this->type_->struct_type()->fields(); | |
11778 | Expression_list::const_iterator pv = this->vals_->begin(); | |
11779 | for (Struct_field_list::const_iterator pf = fields->begin(); | |
11780 | pf != fields->end(); | |
11781 | ++pf, ++pv) | |
11782 | { | |
11783 | if (pv == this->vals_->end()) | |
11784 | return; | |
11785 | if (*pv != NULL) | |
11786 | { | |
11787 | Type_context subcontext(pf->type(), false); | |
11788 | (*pv)->determine_type(&subcontext); | |
11789 | } | |
11790 | } | |
a6cb4c0e | 11791 | // Extra values are an error we will report elsewhere; we still want |
11792 | // to determine the type to avoid knockon errors. | |
11793 | for (; pv != this->vals_->end(); ++pv) | |
11794 | (*pv)->determine_type_no_context(); | |
e440a328 | 11795 | } |
11796 | ||
11797 | // Check types. | |
11798 | ||
11799 | void | |
11800 | Struct_construction_expression::do_check_types(Gogo*) | |
11801 | { | |
11802 | if (this->vals_ == NULL) | |
11803 | return; | |
11804 | ||
11805 | Struct_type* st = this->type_->struct_type(); | |
11806 | if (this->vals_->size() > st->field_count()) | |
11807 | { | |
11808 | this->report_error(_("too many expressions for struct")); | |
11809 | return; | |
11810 | } | |
11811 | ||
11812 | const Struct_field_list* fields = st->fields(); | |
11813 | Expression_list::const_iterator pv = this->vals_->begin(); | |
11814 | int i = 0; | |
11815 | for (Struct_field_list::const_iterator pf = fields->begin(); | |
11816 | pf != fields->end(); | |
11817 | ++pf, ++pv, ++i) | |
11818 | { | |
11819 | if (pv == this->vals_->end()) | |
11820 | { | |
11821 | this->report_error(_("too few expressions for struct")); | |
11822 | break; | |
11823 | } | |
11824 | ||
11825 | if (*pv == NULL) | |
11826 | continue; | |
11827 | ||
11828 | std::string reason; | |
11829 | if (!Type::are_assignable(pf->type(), (*pv)->type(), &reason)) | |
11830 | { | |
11831 | if (reason.empty()) | |
11832 | error_at((*pv)->location(), | |
11833 | "incompatible type for field %d in struct construction", | |
11834 | i + 1); | |
11835 | else | |
11836 | error_at((*pv)->location(), | |
11837 | ("incompatible type for field %d in " | |
11838 | "struct construction (%s)"), | |
11839 | i + 1, reason.c_str()); | |
11840 | this->set_is_error(); | |
11841 | } | |
11842 | } | |
c484d925 | 11843 | go_assert(pv == this->vals_->end()); |
e440a328 | 11844 | } |
11845 | ||
8ba8cc87 | 11846 | // Flatten a struct construction expression. Store the values into |
11847 | // temporaries in case they need interface conversion. | |
11848 | ||
11849 | Expression* | |
11850 | Struct_construction_expression::do_flatten(Gogo*, Named_object*, | |
11851 | Statement_inserter* inserter) | |
11852 | { | |
11853 | if (this->vals_ == NULL) | |
11854 | return this; | |
11855 | ||
11856 | // If this is a constant struct, we don't need temporaries. | |
11857 | if (this->is_constant_struct()) | |
11858 | return this; | |
11859 | ||
11860 | Location loc = this->location(); | |
11861 | for (Expression_list::iterator pv = this->vals_->begin(); | |
11862 | pv != this->vals_->end(); | |
11863 | ++pv) | |
11864 | { | |
11865 | if (*pv != NULL) | |
11866 | { | |
5bf8be8b | 11867 | if ((*pv)->is_error_expression() || (*pv)->type()->is_error_type()) |
11868 | { | |
11869 | go_assert(saw_errors()); | |
11870 | return Expression::make_error(loc); | |
11871 | } | |
8ba8cc87 | 11872 | if (!(*pv)->is_variable()) |
11873 | { | |
11874 | Temporary_statement* temp = | |
11875 | Statement::make_temporary(NULL, *pv, loc); | |
11876 | inserter->insert(temp); | |
11877 | *pv = Expression::make_temporary_reference(temp, loc); | |
11878 | } | |
11879 | } | |
11880 | } | |
11881 | return this; | |
11882 | } | |
11883 | ||
ea664253 | 11884 | // Return the backend representation for constructing a struct. |
e440a328 | 11885 | |
ea664253 | 11886 | Bexpression* |
11887 | Struct_construction_expression::do_get_backend(Translate_context* context) | |
e440a328 | 11888 | { |
11889 | Gogo* gogo = context->gogo(); | |
11890 | ||
2c809f8f | 11891 | Btype* btype = this->type_->get_backend(gogo); |
e440a328 | 11892 | if (this->vals_ == NULL) |
ea664253 | 11893 | return gogo->backend()->zero_expression(btype); |
e440a328 | 11894 | |
e440a328 | 11895 | const Struct_field_list* fields = this->type_->struct_type()->fields(); |
e440a328 | 11896 | Expression_list::const_iterator pv = this->vals_->begin(); |
2c809f8f | 11897 | std::vector<Bexpression*> init; |
11898 | for (Struct_field_list::const_iterator pf = fields->begin(); | |
11899 | pf != fields->end(); | |
11900 | ++pf) | |
e440a328 | 11901 | { |
63697958 | 11902 | Btype* fbtype = pf->type()->get_backend(gogo); |
e440a328 | 11903 | if (pv == this->vals_->end()) |
2c809f8f | 11904 | init.push_back(gogo->backend()->zero_expression(fbtype)); |
e440a328 | 11905 | else if (*pv == NULL) |
11906 | { | |
2c809f8f | 11907 | init.push_back(gogo->backend()->zero_expression(fbtype)); |
e440a328 | 11908 | ++pv; |
11909 | } | |
11910 | else | |
11911 | { | |
2c809f8f | 11912 | Expression* val = |
11913 | Expression::convert_for_assignment(gogo, pf->type(), | |
11914 | *pv, this->location()); | |
ea664253 | 11915 | init.push_back(val->get_backend(context)); |
e440a328 | 11916 | ++pv; |
11917 | } | |
e440a328 | 11918 | } |
ea664253 | 11919 | return gogo->backend()->constructor_expression(btype, init, this->location()); |
e440a328 | 11920 | } |
11921 | ||
11922 | // Export a struct construction. | |
11923 | ||
11924 | void | |
11925 | Struct_construction_expression::do_export(Export* exp) const | |
11926 | { | |
11927 | exp->write_c_string("convert("); | |
11928 | exp->write_type(this->type_); | |
11929 | for (Expression_list::const_iterator pv = this->vals_->begin(); | |
11930 | pv != this->vals_->end(); | |
11931 | ++pv) | |
11932 | { | |
11933 | exp->write_c_string(", "); | |
11934 | if (*pv != NULL) | |
11935 | (*pv)->export_expression(exp); | |
11936 | } | |
11937 | exp->write_c_string(")"); | |
11938 | } | |
11939 | ||
d751bb78 | 11940 | // Dump ast representation of a struct construction expression. |
11941 | ||
11942 | void | |
11943 | Struct_construction_expression::do_dump_expression( | |
11944 | Ast_dump_context* ast_dump_context) const | |
11945 | { | |
d751bb78 | 11946 | ast_dump_context->dump_type(this->type_); |
11947 | ast_dump_context->ostream() << "{"; | |
11948 | ast_dump_context->dump_expression_list(this->vals_); | |
11949 | ast_dump_context->ostream() << "}"; | |
11950 | } | |
11951 | ||
e440a328 | 11952 | // Make a struct composite literal. This used by the thunk code. |
11953 | ||
11954 | Expression* | |
11955 | Expression::make_struct_composite_literal(Type* type, Expression_list* vals, | |
b13c66cd | 11956 | Location location) |
e440a328 | 11957 | { |
c484d925 | 11958 | go_assert(type->struct_type() != NULL); |
e440a328 | 11959 | return new Struct_construction_expression(type, vals, location); |
11960 | } | |
11961 | ||
da244e59 | 11962 | // Class Array_construction_expression. |
e440a328 | 11963 | |
11964 | // Traversal. | |
11965 | ||
11966 | int | |
11967 | Array_construction_expression::do_traverse(Traverse* traverse) | |
11968 | { | |
11969 | if (this->vals_ != NULL | |
11970 | && this->vals_->traverse(traverse) == TRAVERSE_EXIT) | |
11971 | return TRAVERSE_EXIT; | |
11972 | if (Type::traverse(this->type_, traverse) == TRAVERSE_EXIT) | |
11973 | return TRAVERSE_EXIT; | |
11974 | return TRAVERSE_CONTINUE; | |
11975 | } | |
11976 | ||
11977 | // Return whether this is a constant initializer. | |
11978 | ||
11979 | bool | |
11980 | Array_construction_expression::is_constant_array() const | |
11981 | { | |
11982 | if (this->vals_ == NULL) | |
11983 | return true; | |
11984 | ||
11985 | // There are no constant constructors for interfaces. | |
11986 | if (this->type_->array_type()->element_type()->interface_type() != NULL) | |
11987 | return false; | |
11988 | ||
11989 | for (Expression_list::const_iterator pv = this->vals_->begin(); | |
11990 | pv != this->vals_->end(); | |
11991 | ++pv) | |
11992 | { | |
11993 | if (*pv != NULL | |
11994 | && !(*pv)->is_constant() | |
11995 | && (!(*pv)->is_composite_literal() | |
11996 | || (*pv)->is_nonconstant_composite_literal())) | |
11997 | return false; | |
11998 | } | |
11999 | return true; | |
12000 | } | |
12001 | ||
f9ca30f9 | 12002 | // Return whether this is an immutable array initializer. |
12003 | ||
12004 | bool | |
12005 | Array_construction_expression::do_is_immutable() const | |
12006 | { | |
12007 | if (this->vals_ == NULL) | |
12008 | return true; | |
12009 | for (Expression_list::const_iterator pv = this->vals_->begin(); | |
12010 | pv != this->vals_->end(); | |
12011 | ++pv) | |
12012 | { | |
12013 | if (*pv != NULL && !(*pv)->is_immutable()) | |
12014 | return false; | |
12015 | } | |
12016 | return true; | |
12017 | } | |
12018 | ||
e440a328 | 12019 | // Final type determination. |
12020 | ||
12021 | void | |
12022 | Array_construction_expression::do_determine_type(const Type_context*) | |
12023 | { | |
12024 | if (this->vals_ == NULL) | |
12025 | return; | |
12026 | Type_context subcontext(this->type_->array_type()->element_type(), false); | |
12027 | for (Expression_list::const_iterator pv = this->vals_->begin(); | |
12028 | pv != this->vals_->end(); | |
12029 | ++pv) | |
12030 | { | |
12031 | if (*pv != NULL) | |
12032 | (*pv)->determine_type(&subcontext); | |
12033 | } | |
12034 | } | |
12035 | ||
12036 | // Check types. | |
12037 | ||
12038 | void | |
12039 | Array_construction_expression::do_check_types(Gogo*) | |
12040 | { | |
12041 | if (this->vals_ == NULL) | |
12042 | return; | |
12043 | ||
12044 | Array_type* at = this->type_->array_type(); | |
12045 | int i = 0; | |
12046 | Type* element_type = at->element_type(); | |
12047 | for (Expression_list::const_iterator pv = this->vals_->begin(); | |
12048 | pv != this->vals_->end(); | |
12049 | ++pv, ++i) | |
12050 | { | |
12051 | if (*pv != NULL | |
12052 | && !Type::are_assignable(element_type, (*pv)->type(), NULL)) | |
12053 | { | |
12054 | error_at((*pv)->location(), | |
12055 | "incompatible type for element %d in composite literal", | |
12056 | i + 1); | |
12057 | this->set_is_error(); | |
12058 | } | |
12059 | } | |
e440a328 | 12060 | } |
12061 | ||
8ba8cc87 | 12062 | // Flatten an array construction expression. Store the values into |
12063 | // temporaries in case they need interface conversion. | |
12064 | ||
12065 | Expression* | |
12066 | Array_construction_expression::do_flatten(Gogo*, Named_object*, | |
12067 | Statement_inserter* inserter) | |
12068 | { | |
12069 | if (this->vals_ == NULL) | |
12070 | return this; | |
12071 | ||
12072 | // If this is a constant array, we don't need temporaries. | |
12073 | if (this->is_constant_array()) | |
12074 | return this; | |
12075 | ||
12076 | Location loc = this->location(); | |
12077 | for (Expression_list::iterator pv = this->vals_->begin(); | |
12078 | pv != this->vals_->end(); | |
12079 | ++pv) | |
12080 | { | |
12081 | if (*pv != NULL) | |
12082 | { | |
5bf8be8b | 12083 | if ((*pv)->is_error_expression() || (*pv)->type()->is_error_type()) |
12084 | { | |
12085 | go_assert(saw_errors()); | |
12086 | return Expression::make_error(loc); | |
12087 | } | |
8ba8cc87 | 12088 | if (!(*pv)->is_variable()) |
12089 | { | |
12090 | Temporary_statement* temp = | |
12091 | Statement::make_temporary(NULL, *pv, loc); | |
12092 | inserter->insert(temp); | |
12093 | *pv = Expression::make_temporary_reference(temp, loc); | |
12094 | } | |
12095 | } | |
12096 | } | |
12097 | return this; | |
12098 | } | |
12099 | ||
2c809f8f | 12100 | // Get a constructor expression for the array values. |
e440a328 | 12101 | |
2c809f8f | 12102 | Bexpression* |
12103 | Array_construction_expression::get_constructor(Translate_context* context, | |
12104 | Btype* array_btype) | |
e440a328 | 12105 | { |
e440a328 | 12106 | Type* element_type = this->type_->array_type()->element_type(); |
2c809f8f | 12107 | |
12108 | std::vector<unsigned long> indexes; | |
12109 | std::vector<Bexpression*> vals; | |
12110 | Gogo* gogo = context->gogo(); | |
e440a328 | 12111 | if (this->vals_ != NULL) |
12112 | { | |
12113 | size_t i = 0; | |
ffe743ca | 12114 | std::vector<unsigned long>::const_iterator pi; |
12115 | if (this->indexes_ != NULL) | |
12116 | pi = this->indexes_->begin(); | |
e440a328 | 12117 | for (Expression_list::const_iterator pv = this->vals_->begin(); |
12118 | pv != this->vals_->end(); | |
12119 | ++pv, ++i) | |
12120 | { | |
ffe743ca | 12121 | if (this->indexes_ != NULL) |
12122 | go_assert(pi != this->indexes_->end()); | |
ffe743ca | 12123 | |
12124 | if (this->indexes_ == NULL) | |
2c809f8f | 12125 | indexes.push_back(i); |
ffe743ca | 12126 | else |
2c809f8f | 12127 | indexes.push_back(*pi); |
e440a328 | 12128 | if (*pv == NULL) |
63697958 | 12129 | { |
63697958 | 12130 | Btype* ebtype = element_type->get_backend(gogo); |
12131 | Bexpression *zv = gogo->backend()->zero_expression(ebtype); | |
2c809f8f | 12132 | vals.push_back(zv); |
63697958 | 12133 | } |
e440a328 | 12134 | else |
12135 | { | |
2c809f8f | 12136 | Expression* val_expr = |
12137 | Expression::convert_for_assignment(gogo, element_type, *pv, | |
12138 | this->location()); | |
ea664253 | 12139 | vals.push_back(val_expr->get_backend(context)); |
e440a328 | 12140 | } |
ffe743ca | 12141 | if (this->indexes_ != NULL) |
12142 | ++pi; | |
e440a328 | 12143 | } |
ffe743ca | 12144 | if (this->indexes_ != NULL) |
12145 | go_assert(pi == this->indexes_->end()); | |
e440a328 | 12146 | } |
2c809f8f | 12147 | return gogo->backend()->array_constructor_expression(array_btype, indexes, |
12148 | vals, this->location()); | |
e440a328 | 12149 | } |
12150 | ||
12151 | // Export an array construction. | |
12152 | ||
12153 | void | |
12154 | Array_construction_expression::do_export(Export* exp) const | |
12155 | { | |
12156 | exp->write_c_string("convert("); | |
12157 | exp->write_type(this->type_); | |
12158 | if (this->vals_ != NULL) | |
12159 | { | |
ffe743ca | 12160 | std::vector<unsigned long>::const_iterator pi; |
12161 | if (this->indexes_ != NULL) | |
12162 | pi = this->indexes_->begin(); | |
e440a328 | 12163 | for (Expression_list::const_iterator pv = this->vals_->begin(); |
12164 | pv != this->vals_->end(); | |
12165 | ++pv) | |
12166 | { | |
12167 | exp->write_c_string(", "); | |
ffe743ca | 12168 | |
12169 | if (this->indexes_ != NULL) | |
12170 | { | |
12171 | char buf[100]; | |
12172 | snprintf(buf, sizeof buf, "%lu", *pi); | |
12173 | exp->write_c_string(buf); | |
12174 | exp->write_c_string(":"); | |
12175 | } | |
12176 | ||
e440a328 | 12177 | if (*pv != NULL) |
12178 | (*pv)->export_expression(exp); | |
ffe743ca | 12179 | |
12180 | if (this->indexes_ != NULL) | |
12181 | ++pi; | |
e440a328 | 12182 | } |
12183 | } | |
12184 | exp->write_c_string(")"); | |
12185 | } | |
12186 | ||
d751bb78 | 12187 | // Dump ast representation of an array construction expressin. |
12188 | ||
12189 | void | |
12190 | Array_construction_expression::do_dump_expression( | |
12191 | Ast_dump_context* ast_dump_context) const | |
12192 | { | |
ffe743ca | 12193 | Expression* length = this->type_->array_type()->length(); |
8b1c301d | 12194 | |
12195 | ast_dump_context->ostream() << "[" ; | |
12196 | if (length != NULL) | |
12197 | { | |
12198 | ast_dump_context->dump_expression(length); | |
12199 | } | |
12200 | ast_dump_context->ostream() << "]" ; | |
d751bb78 | 12201 | ast_dump_context->dump_type(this->type_); |
12202 | ast_dump_context->ostream() << "{" ; | |
ffe743ca | 12203 | if (this->indexes_ == NULL) |
12204 | ast_dump_context->dump_expression_list(this->vals_); | |
12205 | else | |
12206 | { | |
12207 | Expression_list::const_iterator pv = this->vals_->begin(); | |
12208 | for (std::vector<unsigned long>::const_iterator pi = | |
12209 | this->indexes_->begin(); | |
12210 | pi != this->indexes_->end(); | |
12211 | ++pi, ++pv) | |
12212 | { | |
12213 | if (pi != this->indexes_->begin()) | |
12214 | ast_dump_context->ostream() << ", "; | |
12215 | ast_dump_context->ostream() << *pi << ':'; | |
12216 | ast_dump_context->dump_expression(*pv); | |
12217 | } | |
12218 | } | |
d751bb78 | 12219 | ast_dump_context->ostream() << "}" ; |
12220 | ||
12221 | } | |
12222 | ||
da244e59 | 12223 | // Class Fixed_array_construction_expression. |
e440a328 | 12224 | |
da244e59 | 12225 | Fixed_array_construction_expression::Fixed_array_construction_expression( |
12226 | Type* type, const std::vector<unsigned long>* indexes, | |
12227 | Expression_list* vals, Location location) | |
12228 | : Array_construction_expression(EXPRESSION_FIXED_ARRAY_CONSTRUCTION, | |
12229 | type, indexes, vals, location) | |
12230 | { go_assert(type->array_type() != NULL && !type->is_slice_type()); } | |
e440a328 | 12231 | |
ea664253 | 12232 | // Return the backend representation for constructing a fixed array. |
e440a328 | 12233 | |
ea664253 | 12234 | Bexpression* |
12235 | Fixed_array_construction_expression::do_get_backend(Translate_context* context) | |
e440a328 | 12236 | { |
9f0e0513 | 12237 | Type* type = this->type(); |
12238 | Btype* btype = type->get_backend(context->gogo()); | |
ea664253 | 12239 | return this->get_constructor(context, btype); |
e440a328 | 12240 | } |
12241 | ||
76f85fd6 | 12242 | Expression* |
12243 | Expression::make_array_composite_literal(Type* type, Expression_list* vals, | |
12244 | Location location) | |
12245 | { | |
12246 | go_assert(type->array_type() != NULL && !type->is_slice_type()); | |
12247 | return new Fixed_array_construction_expression(type, NULL, vals, location); | |
12248 | } | |
12249 | ||
da244e59 | 12250 | // Class Slice_construction_expression. |
e440a328 | 12251 | |
da244e59 | 12252 | Slice_construction_expression::Slice_construction_expression( |
12253 | Type* type, const std::vector<unsigned long>* indexes, | |
12254 | Expression_list* vals, Location location) | |
12255 | : Array_construction_expression(EXPRESSION_SLICE_CONSTRUCTION, | |
12256 | type, indexes, vals, location), | |
12257 | valtype_(NULL) | |
e440a328 | 12258 | { |
da244e59 | 12259 | go_assert(type->is_slice_type()); |
23d77f91 | 12260 | |
da244e59 | 12261 | unsigned long lenval; |
12262 | Expression* length; | |
12263 | if (vals == NULL || vals->empty()) | |
12264 | lenval = 0; | |
12265 | else | |
12266 | { | |
12267 | if (this->indexes() == NULL) | |
12268 | lenval = vals->size(); | |
12269 | else | |
12270 | lenval = indexes->back() + 1; | |
12271 | } | |
12272 | Type* int_type = Type::lookup_integer_type("int"); | |
12273 | length = Expression::make_integer_ul(lenval, int_type, location); | |
12274 | Type* element_type = type->array_type()->element_type(); | |
12275 | this->valtype_ = Type::make_array_type(element_type, length); | |
12276 | } | |
e440a328 | 12277 | |
e440a328 | 12278 | |
23d77f91 | 12279 | // Traversal. |
12280 | ||
12281 | int | |
12282 | Slice_construction_expression::do_traverse(Traverse* traverse) | |
12283 | { | |
12284 | if (this->Array_construction_expression::do_traverse(traverse) | |
12285 | == TRAVERSE_EXIT) | |
12286 | return TRAVERSE_EXIT; | |
12287 | if (Type::traverse(this->valtype_, traverse) == TRAVERSE_EXIT) | |
12288 | return TRAVERSE_EXIT; | |
12289 | return TRAVERSE_CONTINUE; | |
12290 | } | |
12291 | ||
ea664253 | 12292 | // Return the backend representation for constructing a slice. |
e440a328 | 12293 | |
ea664253 | 12294 | Bexpression* |
12295 | Slice_construction_expression::do_get_backend(Translate_context* context) | |
e440a328 | 12296 | { |
f9c68f17 | 12297 | Array_type* array_type = this->type()->array_type(); |
12298 | if (array_type == NULL) | |
12299 | { | |
c484d925 | 12300 | go_assert(this->type()->is_error()); |
ea664253 | 12301 | return context->backend()->error_expression(); |
f9c68f17 | 12302 | } |
12303 | ||
f23d7786 | 12304 | Location loc = this->location(); |
f9c68f17 | 12305 | Type* element_type = array_type->element_type(); |
23d77f91 | 12306 | go_assert(this->valtype_ != NULL); |
3d60812e | 12307 | |
f23d7786 | 12308 | Expression_list* vals = this->vals(); |
e440a328 | 12309 | if (this->vals() == NULL || this->vals()->empty()) |
12310 | { | |
f23d7786 | 12311 | // We need to create a unique value for the empty array literal. |
12312 | vals = new Expression_list; | |
12313 | vals->push_back(NULL); | |
e440a328 | 12314 | } |
f23d7786 | 12315 | Expression* array_val = |
12316 | new Fixed_array_construction_expression(this->valtype_, this->indexes(), | |
12317 | vals, loc); | |
e440a328 | 12318 | |
f23d7786 | 12319 | bool is_constant_initializer = array_val->is_immutable(); |
d8829beb | 12320 | |
12321 | // We have to copy the initial values into heap memory if we are in | |
12322 | // a function or if the values are not constants. We also have to | |
12323 | // copy them if they may contain pointers in a non-constant context, | |
12324 | // as otherwise the garbage collector won't see them. | |
12325 | bool copy_to_heap = (context->function() != NULL | |
12326 | || !is_constant_initializer | |
12327 | || (element_type->has_pointer() | |
12328 | && !context->is_const())); | |
e440a328 | 12329 | |
f23d7786 | 12330 | Expression* space; |
d8829beb | 12331 | if (!copy_to_heap) |
e440a328 | 12332 | { |
f23d7786 | 12333 | // The initializer will only run once. |
12334 | space = Expression::make_unary(OPERATOR_AND, array_val, loc); | |
12335 | space->unary_expression()->set_is_slice_init(); | |
e440a328 | 12336 | } |
12337 | else | |
f23d7786 | 12338 | space = Expression::make_heap_expression(array_val, loc); |
e440a328 | 12339 | |
2c809f8f | 12340 | // Build a constructor for the slice. |
e440a328 | 12341 | |
f23d7786 | 12342 | Expression* len = this->valtype_->array_type()->length(); |
12343 | Expression* slice_val = | |
12344 | Expression::make_slice_value(this->type(), space, len, len, loc); | |
ea664253 | 12345 | return slice_val->get_backend(context); |
e440a328 | 12346 | } |
12347 | ||
12348 | // Make a slice composite literal. This is used by the type | |
12349 | // descriptor code. | |
12350 | ||
12351 | Expression* | |
12352 | Expression::make_slice_composite_literal(Type* type, Expression_list* vals, | |
b13c66cd | 12353 | Location location) |
e440a328 | 12354 | { |
411eb89e | 12355 | go_assert(type->is_slice_type()); |
2c809f8f | 12356 | return new Slice_construction_expression(type, NULL, vals, location); |
e440a328 | 12357 | } |
12358 | ||
da244e59 | 12359 | // Class Map_construction_expression. |
e440a328 | 12360 | |
12361 | // Traversal. | |
12362 | ||
12363 | int | |
12364 | Map_construction_expression::do_traverse(Traverse* traverse) | |
12365 | { | |
12366 | if (this->vals_ != NULL | |
12367 | && this->vals_->traverse(traverse) == TRAVERSE_EXIT) | |
12368 | return TRAVERSE_EXIT; | |
12369 | if (Type::traverse(this->type_, traverse) == TRAVERSE_EXIT) | |
12370 | return TRAVERSE_EXIT; | |
12371 | return TRAVERSE_CONTINUE; | |
12372 | } | |
12373 | ||
2c809f8f | 12374 | // Flatten constructor initializer into a temporary variable since |
12375 | // we need to take its address for __go_construct_map. | |
12376 | ||
12377 | Expression* | |
12378 | Map_construction_expression::do_flatten(Gogo* gogo, Named_object*, | |
12379 | Statement_inserter* inserter) | |
12380 | { | |
12381 | if (!this->is_error_expression() | |
12382 | && this->vals_ != NULL | |
12383 | && !this->vals_->empty() | |
12384 | && this->constructor_temp_ == NULL) | |
12385 | { | |
12386 | Map_type* mt = this->type_->map_type(); | |
12387 | Type* key_type = mt->key_type(); | |
12388 | Type* val_type = mt->val_type(); | |
12389 | this->element_type_ = Type::make_builtin_struct_type(2, | |
12390 | "__key", key_type, | |
12391 | "__val", val_type); | |
12392 | ||
12393 | Expression_list* value_pairs = new Expression_list(); | |
12394 | Location loc = this->location(); | |
12395 | ||
12396 | size_t i = 0; | |
12397 | for (Expression_list::const_iterator pv = this->vals_->begin(); | |
12398 | pv != this->vals_->end(); | |
12399 | ++pv, ++i) | |
12400 | { | |
12401 | Expression_list* key_value_pair = new Expression_list(); | |
91c0fd76 | 12402 | Expression* key = *pv; |
5bf8be8b | 12403 | if (key->is_error_expression() || key->type()->is_error_type()) |
12404 | { | |
12405 | go_assert(saw_errors()); | |
12406 | return Expression::make_error(loc); | |
12407 | } | |
91c0fd76 | 12408 | if (key->type()->interface_type() != NULL && !key->is_variable()) |
12409 | { | |
12410 | Temporary_statement* temp = | |
12411 | Statement::make_temporary(NULL, key, loc); | |
12412 | inserter->insert(temp); | |
12413 | key = Expression::make_temporary_reference(temp, loc); | |
12414 | } | |
12415 | key = Expression::convert_for_assignment(gogo, key_type, key, loc); | |
2c809f8f | 12416 | |
12417 | ++pv; | |
91c0fd76 | 12418 | Expression* val = *pv; |
5bf8be8b | 12419 | if (val->is_error_expression() || val->type()->is_error_type()) |
12420 | { | |
12421 | go_assert(saw_errors()); | |
12422 | return Expression::make_error(loc); | |
12423 | } | |
91c0fd76 | 12424 | if (val->type()->interface_type() != NULL && !val->is_variable()) |
12425 | { | |
12426 | Temporary_statement* temp = | |
12427 | Statement::make_temporary(NULL, val, loc); | |
12428 | inserter->insert(temp); | |
12429 | val = Expression::make_temporary_reference(temp, loc); | |
12430 | } | |
12431 | val = Expression::convert_for_assignment(gogo, val_type, val, loc); | |
2c809f8f | 12432 | |
12433 | key_value_pair->push_back(key); | |
12434 | key_value_pair->push_back(val); | |
12435 | value_pairs->push_back( | |
12436 | Expression::make_struct_composite_literal(this->element_type_, | |
12437 | key_value_pair, loc)); | |
12438 | } | |
12439 | ||
e67508fa | 12440 | Expression* element_count = Expression::make_integer_ul(i, NULL, loc); |
2c809f8f | 12441 | Type* ctor_type = |
12442 | Type::make_array_type(this->element_type_, element_count); | |
12443 | Expression* constructor = | |
12444 | new Fixed_array_construction_expression(ctor_type, NULL, | |
12445 | value_pairs, loc); | |
12446 | ||
12447 | this->constructor_temp_ = | |
12448 | Statement::make_temporary(NULL, constructor, loc); | |
12449 | constructor->issue_nil_check(); | |
12450 | this->constructor_temp_->set_is_address_taken(); | |
12451 | inserter->insert(this->constructor_temp_); | |
12452 | } | |
12453 | ||
12454 | return this; | |
12455 | } | |
12456 | ||
e440a328 | 12457 | // Final type determination. |
12458 | ||
12459 | void | |
12460 | Map_construction_expression::do_determine_type(const Type_context*) | |
12461 | { | |
12462 | if (this->vals_ == NULL) | |
12463 | return; | |
12464 | ||
12465 | Map_type* mt = this->type_->map_type(); | |
12466 | Type_context key_context(mt->key_type(), false); | |
12467 | Type_context val_context(mt->val_type(), false); | |
12468 | for (Expression_list::const_iterator pv = this->vals_->begin(); | |
12469 | pv != this->vals_->end(); | |
12470 | ++pv) | |
12471 | { | |
12472 | (*pv)->determine_type(&key_context); | |
12473 | ++pv; | |
12474 | (*pv)->determine_type(&val_context); | |
12475 | } | |
12476 | } | |
12477 | ||
12478 | // Check types. | |
12479 | ||
12480 | void | |
12481 | Map_construction_expression::do_check_types(Gogo*) | |
12482 | { | |
12483 | if (this->vals_ == NULL) | |
12484 | return; | |
12485 | ||
12486 | Map_type* mt = this->type_->map_type(); | |
12487 | int i = 0; | |
12488 | Type* key_type = mt->key_type(); | |
12489 | Type* val_type = mt->val_type(); | |
12490 | for (Expression_list::const_iterator pv = this->vals_->begin(); | |
12491 | pv != this->vals_->end(); | |
12492 | ++pv, ++i) | |
12493 | { | |
12494 | if (!Type::are_assignable(key_type, (*pv)->type(), NULL)) | |
12495 | { | |
12496 | error_at((*pv)->location(), | |
12497 | "incompatible type for element %d key in map construction", | |
12498 | i + 1); | |
12499 | this->set_is_error(); | |
12500 | } | |
12501 | ++pv; | |
12502 | if (!Type::are_assignable(val_type, (*pv)->type(), NULL)) | |
12503 | { | |
12504 | error_at((*pv)->location(), | |
12505 | ("incompatible type for element %d value " | |
12506 | "in map construction"), | |
12507 | i + 1); | |
12508 | this->set_is_error(); | |
12509 | } | |
12510 | } | |
12511 | } | |
12512 | ||
ea664253 | 12513 | // Return the backend representation for constructing a map. |
e440a328 | 12514 | |
ea664253 | 12515 | Bexpression* |
12516 | Map_construction_expression::do_get_backend(Translate_context* context) | |
e440a328 | 12517 | { |
2c809f8f | 12518 | if (this->is_error_expression()) |
ea664253 | 12519 | return context->backend()->error_expression(); |
2c809f8f | 12520 | Location loc = this->location(); |
e440a328 | 12521 | |
e440a328 | 12522 | size_t i = 0; |
2c809f8f | 12523 | Expression* ventries; |
e440a328 | 12524 | if (this->vals_ == NULL || this->vals_->empty()) |
2c809f8f | 12525 | ventries = Expression::make_nil(loc); |
e440a328 | 12526 | else |
12527 | { | |
2c809f8f | 12528 | go_assert(this->constructor_temp_ != NULL); |
12529 | i = this->vals_->size() / 2; | |
e440a328 | 12530 | |
2c809f8f | 12531 | Expression* ctor_ref = |
12532 | Expression::make_temporary_reference(this->constructor_temp_, loc); | |
12533 | ventries = Expression::make_unary(OPERATOR_AND, ctor_ref, loc); | |
12534 | } | |
e440a328 | 12535 | |
2c809f8f | 12536 | Map_type* mt = this->type_->map_type(); |
12537 | if (this->element_type_ == NULL) | |
12538 | this->element_type_ = | |
12539 | Type::make_builtin_struct_type(2, | |
12540 | "__key", mt->key_type(), | |
12541 | "__val", mt->val_type()); | |
12542 | Expression* descriptor = Expression::make_map_descriptor(mt, loc); | |
12543 | ||
12544 | Type* uintptr_t = Type::lookup_integer_type("uintptr"); | |
e67508fa | 12545 | Expression* count = Expression::make_integer_ul(i, uintptr_t, loc); |
2c809f8f | 12546 | |
12547 | Expression* entry_size = | |
12548 | Expression::make_type_info(this->element_type_, TYPE_INFO_SIZE); | |
12549 | ||
12550 | unsigned int field_index; | |
12551 | const Struct_field* valfield = | |
12552 | this->element_type_->find_local_field("__val", &field_index); | |
12553 | Expression* val_offset = | |
12554 | Expression::make_struct_field_offset(this->element_type_, valfield); | |
12555 | Expression* val_size = | |
12556 | Expression::make_type_info(mt->val_type(), TYPE_INFO_SIZE); | |
12557 | ||
12558 | Expression* map_ctor = | |
12559 | Runtime::make_call(Runtime::CONSTRUCT_MAP, loc, 6, descriptor, count, | |
12560 | entry_size, val_offset, val_size, ventries); | |
ea664253 | 12561 | return map_ctor->get_backend(context); |
2c809f8f | 12562 | } |
e440a328 | 12563 | |
2c809f8f | 12564 | // Export an array construction. |
e440a328 | 12565 | |
2c809f8f | 12566 | void |
12567 | Map_construction_expression::do_export(Export* exp) const | |
12568 | { | |
12569 | exp->write_c_string("convert("); | |
12570 | exp->write_type(this->type_); | |
12571 | for (Expression_list::const_iterator pv = this->vals_->begin(); | |
12572 | pv != this->vals_->end(); | |
12573 | ++pv) | |
12574 | { | |
12575 | exp->write_c_string(", "); | |
12576 | (*pv)->export_expression(exp); | |
12577 | } | |
12578 | exp->write_c_string(")"); | |
12579 | } | |
e440a328 | 12580 | |
2c809f8f | 12581 | // Dump ast representation for a map construction expression. |
d751bb78 | 12582 | |
12583 | void | |
12584 | Map_construction_expression::do_dump_expression( | |
12585 | Ast_dump_context* ast_dump_context) const | |
12586 | { | |
d751bb78 | 12587 | ast_dump_context->ostream() << "{" ; |
8b1c301d | 12588 | ast_dump_context->dump_expression_list(this->vals_, true); |
d751bb78 | 12589 | ast_dump_context->ostream() << "}"; |
12590 | } | |
12591 | ||
7795ac51 | 12592 | // Class Composite_literal_expression. |
e440a328 | 12593 | |
12594 | // Traversal. | |
12595 | ||
12596 | int | |
12597 | Composite_literal_expression::do_traverse(Traverse* traverse) | |
12598 | { | |
dbffccfc | 12599 | if (Type::traverse(this->type_, traverse) == TRAVERSE_EXIT) |
e440a328 | 12600 | return TRAVERSE_EXIT; |
dbffccfc | 12601 | |
12602 | // If this is a struct composite literal with keys, then the keys | |
12603 | // are field names, not expressions. We don't want to traverse them | |
12604 | // in that case. If we do, we can give an erroneous error "variable | |
12605 | // initializer refers to itself." See bug482.go in the testsuite. | |
12606 | if (this->has_keys_ && this->vals_ != NULL) | |
12607 | { | |
12608 | // The type may not be resolvable at this point. | |
12609 | Type* type = this->type_; | |
a01f2481 | 12610 | |
7795ac51 | 12611 | for (int depth = 0; depth < this->depth_; ++depth) |
a01f2481 | 12612 | { |
12613 | if (type->array_type() != NULL) | |
12614 | type = type->array_type()->element_type(); | |
12615 | else if (type->map_type() != NULL) | |
7795ac51 | 12616 | { |
12617 | if (this->key_path_[depth]) | |
12618 | type = type->map_type()->key_type(); | |
12619 | else | |
12620 | type = type->map_type()->val_type(); | |
12621 | } | |
a01f2481 | 12622 | else |
12623 | { | |
12624 | // This error will be reported during lowering. | |
12625 | return TRAVERSE_CONTINUE; | |
12626 | } | |
12627 | } | |
12628 | ||
dbffccfc | 12629 | while (true) |
12630 | { | |
12631 | if (type->classification() == Type::TYPE_NAMED) | |
12632 | type = type->named_type()->real_type(); | |
12633 | else if (type->classification() == Type::TYPE_FORWARD) | |
12634 | { | |
12635 | Type* t = type->forwarded(); | |
12636 | if (t == type) | |
12637 | break; | |
12638 | type = t; | |
12639 | } | |
12640 | else | |
12641 | break; | |
12642 | } | |
12643 | ||
12644 | if (type->classification() == Type::TYPE_STRUCT) | |
12645 | { | |
12646 | Expression_list::iterator p = this->vals_->begin(); | |
12647 | while (p != this->vals_->end()) | |
12648 | { | |
12649 | // Skip key. | |
12650 | ++p; | |
12651 | go_assert(p != this->vals_->end()); | |
12652 | if (Expression::traverse(&*p, traverse) == TRAVERSE_EXIT) | |
12653 | return TRAVERSE_EXIT; | |
12654 | ++p; | |
12655 | } | |
12656 | return TRAVERSE_CONTINUE; | |
12657 | } | |
12658 | } | |
12659 | ||
12660 | if (this->vals_ != NULL) | |
12661 | return this->vals_->traverse(traverse); | |
12662 | ||
12663 | return TRAVERSE_CONTINUE; | |
e440a328 | 12664 | } |
12665 | ||
12666 | // Lower a generic composite literal into a specific version based on | |
12667 | // the type. | |
12668 | ||
12669 | Expression* | |
ceeb4318 | 12670 | Composite_literal_expression::do_lower(Gogo* gogo, Named_object* function, |
12671 | Statement_inserter* inserter, int) | |
e440a328 | 12672 | { |
12673 | Type* type = this->type_; | |
12674 | ||
7795ac51 | 12675 | for (int depth = 0; depth < this->depth_; ++depth) |
e440a328 | 12676 | { |
12677 | if (type->array_type() != NULL) | |
12678 | type = type->array_type()->element_type(); | |
12679 | else if (type->map_type() != NULL) | |
7795ac51 | 12680 | { |
12681 | if (this->key_path_[depth]) | |
12682 | type = type->map_type()->key_type(); | |
12683 | else | |
12684 | type = type->map_type()->val_type(); | |
12685 | } | |
e440a328 | 12686 | else |
12687 | { | |
5c13bd80 | 12688 | if (!type->is_error()) |
e440a328 | 12689 | error_at(this->location(), |
12690 | ("may only omit types within composite literals " | |
12691 | "of slice, array, or map type")); | |
12692 | return Expression::make_error(this->location()); | |
12693 | } | |
12694 | } | |
12695 | ||
e00772b3 | 12696 | Type *pt = type->points_to(); |
12697 | bool is_pointer = false; | |
12698 | if (pt != NULL) | |
12699 | { | |
12700 | is_pointer = true; | |
12701 | type = pt; | |
12702 | } | |
12703 | ||
12704 | Expression* ret; | |
5c13bd80 | 12705 | if (type->is_error()) |
e440a328 | 12706 | return Expression::make_error(this->location()); |
12707 | else if (type->struct_type() != NULL) | |
e00772b3 | 12708 | ret = this->lower_struct(gogo, type); |
e440a328 | 12709 | else if (type->array_type() != NULL) |
113ef6a5 | 12710 | ret = this->lower_array(type); |
e440a328 | 12711 | else if (type->map_type() != NULL) |
e00772b3 | 12712 | ret = this->lower_map(gogo, function, inserter, type); |
e440a328 | 12713 | else |
12714 | { | |
12715 | error_at(this->location(), | |
12716 | ("expected struct, slice, array, or map type " | |
12717 | "for composite literal")); | |
12718 | return Expression::make_error(this->location()); | |
12719 | } | |
e00772b3 | 12720 | |
12721 | if (is_pointer) | |
2c809f8f | 12722 | ret = Expression::make_heap_expression(ret, this->location()); |
e00772b3 | 12723 | |
12724 | return ret; | |
e440a328 | 12725 | } |
12726 | ||
12727 | // Lower a struct composite literal. | |
12728 | ||
12729 | Expression* | |
81c4b26b | 12730 | Composite_literal_expression::lower_struct(Gogo* gogo, Type* type) |
e440a328 | 12731 | { |
b13c66cd | 12732 | Location location = this->location(); |
e440a328 | 12733 | Struct_type* st = type->struct_type(); |
12734 | if (this->vals_ == NULL || !this->has_keys_) | |
07daa4e7 | 12735 | { |
e6013c28 | 12736 | if (this->vals_ != NULL |
12737 | && !this->vals_->empty() | |
12738 | && type->named_type() != NULL | |
12739 | && type->named_type()->named_object()->package() != NULL) | |
12740 | { | |
12741 | for (Struct_field_list::const_iterator pf = st->fields()->begin(); | |
12742 | pf != st->fields()->end(); | |
12743 | ++pf) | |
07daa4e7 | 12744 | { |
07ba7f26 | 12745 | if (Gogo::is_hidden_name(pf->field_name()) |
12746 | || pf->is_embedded_builtin(gogo)) | |
07daa4e7 | 12747 | error_at(this->location(), |
e6013c28 | 12748 | "assignment of unexported field %qs in %qs literal", |
12749 | Gogo::message_name(pf->field_name()).c_str(), | |
12750 | type->named_type()->message_name().c_str()); | |
07daa4e7 | 12751 | } |
12752 | } | |
12753 | ||
12754 | return new Struct_construction_expression(type, this->vals_, location); | |
12755 | } | |
e440a328 | 12756 | |
12757 | size_t field_count = st->field_count(); | |
12758 | std::vector<Expression*> vals(field_count); | |
0c4f5a19 | 12759 | std::vector<int>* traverse_order = new(std::vector<int>); |
e440a328 | 12760 | Expression_list::const_iterator p = this->vals_->begin(); |
62750cd5 | 12761 | Expression* external_expr = NULL; |
12762 | const Named_object* external_no = NULL; | |
e440a328 | 12763 | while (p != this->vals_->end()) |
12764 | { | |
12765 | Expression* name_expr = *p; | |
12766 | ||
12767 | ++p; | |
c484d925 | 12768 | go_assert(p != this->vals_->end()); |
e440a328 | 12769 | Expression* val = *p; |
12770 | ||
12771 | ++p; | |
12772 | ||
12773 | if (name_expr == NULL) | |
12774 | { | |
12775 | error_at(val->location(), "mixture of field and value initializers"); | |
12776 | return Expression::make_error(location); | |
12777 | } | |
12778 | ||
12779 | bool bad_key = false; | |
12780 | std::string name; | |
81c4b26b | 12781 | const Named_object* no = NULL; |
e440a328 | 12782 | switch (name_expr->classification()) |
12783 | { | |
12784 | case EXPRESSION_UNKNOWN_REFERENCE: | |
12785 | name = name_expr->unknown_expression()->name(); | |
7f7ce694 | 12786 | if (type->named_type() != NULL) |
12787 | { | |
12788 | // If the named object found for this field name comes from a | |
12789 | // different package than the struct it is a part of, do not count | |
12790 | // this incorrect lookup as a usage of the object's package. | |
12791 | no = name_expr->unknown_expression()->named_object(); | |
12792 | if (no->package() != NULL | |
12793 | && no->package() != type->named_type()->named_object()->package()) | |
12794 | no->package()->forget_usage(name_expr); | |
12795 | } | |
e440a328 | 12796 | break; |
12797 | ||
12798 | case EXPRESSION_CONST_REFERENCE: | |
81c4b26b | 12799 | no = static_cast<Const_expression*>(name_expr)->named_object(); |
e440a328 | 12800 | break; |
12801 | ||
12802 | case EXPRESSION_TYPE: | |
12803 | { | |
12804 | Type* t = name_expr->type(); | |
12805 | Named_type* nt = t->named_type(); | |
12806 | if (nt == NULL) | |
12807 | bad_key = true; | |
12808 | else | |
81c4b26b | 12809 | no = nt->named_object(); |
e440a328 | 12810 | } |
12811 | break; | |
12812 | ||
12813 | case EXPRESSION_VAR_REFERENCE: | |
81c4b26b | 12814 | no = name_expr->var_expression()->named_object(); |
e440a328 | 12815 | break; |
12816 | ||
12817 | case EXPRESSION_FUNC_REFERENCE: | |
81c4b26b | 12818 | no = name_expr->func_expression()->named_object(); |
e440a328 | 12819 | break; |
12820 | ||
12821 | case EXPRESSION_UNARY: | |
12822 | // If there is a local variable around with the same name as | |
12823 | // the field, and this occurs in the closure, then the | |
12824 | // parser may turn the field reference into an indirection | |
12825 | // through the closure. FIXME: This is a mess. | |
12826 | { | |
12827 | bad_key = true; | |
12828 | Unary_expression* ue = static_cast<Unary_expression*>(name_expr); | |
12829 | if (ue->op() == OPERATOR_MULT) | |
12830 | { | |
12831 | Field_reference_expression* fre = | |
12832 | ue->operand()->field_reference_expression(); | |
12833 | if (fre != NULL) | |
12834 | { | |
12835 | Struct_type* st = | |
12836 | fre->expr()->type()->deref()->struct_type(); | |
12837 | if (st != NULL) | |
12838 | { | |
12839 | const Struct_field* sf = st->field(fre->field_index()); | |
12840 | name = sf->field_name(); | |
2d29d278 | 12841 | |
12842 | // See below. FIXME. | |
12843 | if (!Gogo::is_hidden_name(name) | |
12844 | && name[0] >= 'a' | |
12845 | && name[0] <= 'z') | |
12846 | { | |
12847 | if (gogo->lookup_global(name.c_str()) != NULL) | |
12848 | name = gogo->pack_hidden_name(name, false); | |
12849 | } | |
12850 | ||
e440a328 | 12851 | char buf[20]; |
12852 | snprintf(buf, sizeof buf, "%u", fre->field_index()); | |
12853 | size_t buflen = strlen(buf); | |
12854 | if (name.compare(name.length() - buflen, buflen, buf) | |
12855 | == 0) | |
12856 | { | |
12857 | name = name.substr(0, name.length() - buflen); | |
12858 | bad_key = false; | |
12859 | } | |
12860 | } | |
12861 | } | |
12862 | } | |
12863 | } | |
12864 | break; | |
12865 | ||
12866 | default: | |
12867 | bad_key = true; | |
12868 | break; | |
12869 | } | |
12870 | if (bad_key) | |
12871 | { | |
12872 | error_at(name_expr->location(), "expected struct field name"); | |
12873 | return Expression::make_error(location); | |
12874 | } | |
12875 | ||
81c4b26b | 12876 | if (no != NULL) |
12877 | { | |
62750cd5 | 12878 | if (no->package() != NULL && external_expr == NULL) |
12879 | { | |
12880 | external_expr = name_expr; | |
12881 | external_no = no; | |
12882 | } | |
12883 | ||
81c4b26b | 12884 | name = no->name(); |
12885 | ||
12886 | // A predefined name won't be packed. If it starts with a | |
12887 | // lower case letter we need to check for that case, because | |
2d29d278 | 12888 | // the field name will be packed. FIXME. |
81c4b26b | 12889 | if (!Gogo::is_hidden_name(name) |
12890 | && name[0] >= 'a' | |
12891 | && name[0] <= 'z') | |
12892 | { | |
12893 | Named_object* gno = gogo->lookup_global(name.c_str()); | |
12894 | if (gno == no) | |
12895 | name = gogo->pack_hidden_name(name, false); | |
12896 | } | |
12897 | } | |
12898 | ||
e440a328 | 12899 | unsigned int index; |
12900 | const Struct_field* sf = st->find_local_field(name, &index); | |
12901 | if (sf == NULL) | |
12902 | { | |
12903 | error_at(name_expr->location(), "unknown field %qs in %qs", | |
12904 | Gogo::message_name(name).c_str(), | |
12905 | (type->named_type() != NULL | |
12906 | ? type->named_type()->message_name().c_str() | |
12907 | : "unnamed struct")); | |
12908 | return Expression::make_error(location); | |
12909 | } | |
12910 | if (vals[index] != NULL) | |
12911 | { | |
12912 | error_at(name_expr->location(), | |
12913 | "duplicate value for field %qs in %qs", | |
12914 | Gogo::message_name(name).c_str(), | |
12915 | (type->named_type() != NULL | |
12916 | ? type->named_type()->message_name().c_str() | |
12917 | : "unnamed struct")); | |
12918 | return Expression::make_error(location); | |
12919 | } | |
12920 | ||
07daa4e7 | 12921 | if (type->named_type() != NULL |
12922 | && type->named_type()->named_object()->package() != NULL | |
07ba7f26 | 12923 | && (Gogo::is_hidden_name(sf->field_name()) |
12924 | || sf->is_embedded_builtin(gogo))) | |
07daa4e7 | 12925 | error_at(name_expr->location(), |
12926 | "assignment of unexported field %qs in %qs literal", | |
12927 | Gogo::message_name(sf->field_name()).c_str(), | |
12928 | type->named_type()->message_name().c_str()); | |
07daa4e7 | 12929 | |
e440a328 | 12930 | vals[index] = val; |
0c4f5a19 | 12931 | traverse_order->push_back(index); |
e440a328 | 12932 | } |
12933 | ||
62750cd5 | 12934 | if (!this->all_are_names_) |
12935 | { | |
12936 | // This is a weird case like bug462 in the testsuite. | |
12937 | if (external_expr == NULL) | |
12938 | error_at(this->location(), "unknown field in %qs literal", | |
12939 | (type->named_type() != NULL | |
12940 | ? type->named_type()->message_name().c_str() | |
12941 | : "unnamed struct")); | |
12942 | else | |
12943 | error_at(external_expr->location(), "unknown field %qs in %qs", | |
12944 | external_no->message_name().c_str(), | |
12945 | (type->named_type() != NULL | |
12946 | ? type->named_type()->message_name().c_str() | |
12947 | : "unnamed struct")); | |
12948 | return Expression::make_error(location); | |
12949 | } | |
12950 | ||
e440a328 | 12951 | Expression_list* list = new Expression_list; |
12952 | list->reserve(field_count); | |
12953 | for (size_t i = 0; i < field_count; ++i) | |
12954 | list->push_back(vals[i]); | |
12955 | ||
0c4f5a19 | 12956 | Struct_construction_expression* ret = |
12957 | new Struct_construction_expression(type, list, location); | |
12958 | ret->set_traverse_order(traverse_order); | |
12959 | return ret; | |
e440a328 | 12960 | } |
12961 | ||
00773463 | 12962 | // Used to sort an index/value array. |
12963 | ||
12964 | class Index_value_compare | |
12965 | { | |
12966 | public: | |
12967 | bool | |
12968 | operator()(const std::pair<unsigned long, Expression*>& a, | |
12969 | const std::pair<unsigned long, Expression*>& b) | |
12970 | { return a.first < b.first; } | |
12971 | }; | |
12972 | ||
e440a328 | 12973 | // Lower an array composite literal. |
12974 | ||
12975 | Expression* | |
113ef6a5 | 12976 | Composite_literal_expression::lower_array(Type* type) |
e440a328 | 12977 | { |
b13c66cd | 12978 | Location location = this->location(); |
e440a328 | 12979 | if (this->vals_ == NULL || !this->has_keys_) |
ffe743ca | 12980 | return this->make_array(type, NULL, this->vals_); |
e440a328 | 12981 | |
ffe743ca | 12982 | std::vector<unsigned long>* indexes = new std::vector<unsigned long>; |
12983 | indexes->reserve(this->vals_->size()); | |
00773463 | 12984 | bool indexes_out_of_order = false; |
ffe743ca | 12985 | Expression_list* vals = new Expression_list(); |
12986 | vals->reserve(this->vals_->size()); | |
e440a328 | 12987 | unsigned long index = 0; |
12988 | Expression_list::const_iterator p = this->vals_->begin(); | |
12989 | while (p != this->vals_->end()) | |
12990 | { | |
12991 | Expression* index_expr = *p; | |
12992 | ||
12993 | ++p; | |
c484d925 | 12994 | go_assert(p != this->vals_->end()); |
e440a328 | 12995 | Expression* val = *p; |
12996 | ||
12997 | ++p; | |
12998 | ||
ffe743ca | 12999 | if (index_expr == NULL) |
13000 | { | |
13001 | if (!indexes->empty()) | |
13002 | indexes->push_back(index); | |
13003 | } | |
13004 | else | |
e440a328 | 13005 | { |
ffe743ca | 13006 | if (indexes->empty() && !vals->empty()) |
13007 | { | |
13008 | for (size_t i = 0; i < vals->size(); ++i) | |
13009 | indexes->push_back(i); | |
13010 | } | |
13011 | ||
0c77715b | 13012 | Numeric_constant nc; |
13013 | if (!index_expr->numeric_constant_value(&nc)) | |
e440a328 | 13014 | { |
e440a328 | 13015 | error_at(index_expr->location(), |
13016 | "index expression is not integer constant"); | |
13017 | return Expression::make_error(location); | |
13018 | } | |
6f6d9955 | 13019 | |
0c77715b | 13020 | switch (nc.to_unsigned_long(&index)) |
e440a328 | 13021 | { |
0c77715b | 13022 | case Numeric_constant::NC_UL_VALID: |
13023 | break; | |
13024 | case Numeric_constant::NC_UL_NOTINT: | |
13025 | error_at(index_expr->location(), | |
13026 | "index expression is not integer constant"); | |
13027 | return Expression::make_error(location); | |
13028 | case Numeric_constant::NC_UL_NEGATIVE: | |
e440a328 | 13029 | error_at(index_expr->location(), "index expression is negative"); |
13030 | return Expression::make_error(location); | |
0c77715b | 13031 | case Numeric_constant::NC_UL_BIG: |
e440a328 | 13032 | error_at(index_expr->location(), "index value overflow"); |
13033 | return Expression::make_error(location); | |
0c77715b | 13034 | default: |
13035 | go_unreachable(); | |
e440a328 | 13036 | } |
6f6d9955 | 13037 | |
13038 | Named_type* ntype = Type::lookup_integer_type("int"); | |
13039 | Integer_type* inttype = ntype->integer_type(); | |
0c77715b | 13040 | if (sizeof(index) <= static_cast<size_t>(inttype->bits() * 8) |
13041 | && index >> (inttype->bits() - 1) != 0) | |
6f6d9955 | 13042 | { |
6f6d9955 | 13043 | error_at(index_expr->location(), "index value overflow"); |
13044 | return Expression::make_error(location); | |
13045 | } | |
13046 | ||
ffe743ca | 13047 | if (std::find(indexes->begin(), indexes->end(), index) |
13048 | != indexes->end()) | |
e440a328 | 13049 | { |
ffe743ca | 13050 | error_at(index_expr->location(), "duplicate value for index %lu", |
e440a328 | 13051 | index); |
13052 | return Expression::make_error(location); | |
13053 | } | |
ffe743ca | 13054 | |
00773463 | 13055 | if (!indexes->empty() && index < indexes->back()) |
13056 | indexes_out_of_order = true; | |
13057 | ||
ffe743ca | 13058 | indexes->push_back(index); |
e440a328 | 13059 | } |
13060 | ||
ffe743ca | 13061 | vals->push_back(val); |
13062 | ||
e440a328 | 13063 | ++index; |
13064 | } | |
13065 | ||
ffe743ca | 13066 | if (indexes->empty()) |
13067 | { | |
13068 | delete indexes; | |
13069 | indexes = NULL; | |
13070 | } | |
e440a328 | 13071 | |
00773463 | 13072 | if (indexes_out_of_order) |
13073 | { | |
13074 | typedef std::vector<std::pair<unsigned long, Expression*> > V; | |
13075 | ||
13076 | V v; | |
13077 | v.reserve(indexes->size()); | |
13078 | std::vector<unsigned long>::const_iterator pi = indexes->begin(); | |
13079 | for (Expression_list::const_iterator pe = vals->begin(); | |
13080 | pe != vals->end(); | |
13081 | ++pe, ++pi) | |
13082 | v.push_back(std::make_pair(*pi, *pe)); | |
13083 | ||
13084 | std::sort(v.begin(), v.end(), Index_value_compare()); | |
13085 | ||
13086 | delete indexes; | |
13087 | delete vals; | |
13088 | indexes = new std::vector<unsigned long>(); | |
13089 | indexes->reserve(v.size()); | |
13090 | vals = new Expression_list(); | |
13091 | vals->reserve(v.size()); | |
13092 | ||
13093 | for (V::const_iterator p = v.begin(); p != v.end(); ++p) | |
13094 | { | |
13095 | indexes->push_back(p->first); | |
13096 | vals->push_back(p->second); | |
13097 | } | |
13098 | } | |
13099 | ||
ffe743ca | 13100 | return this->make_array(type, indexes, vals); |
e440a328 | 13101 | } |
13102 | ||
13103 | // Actually build the array composite literal. This handles | |
13104 | // [...]{...}. | |
13105 | ||
13106 | Expression* | |
ffe743ca | 13107 | Composite_literal_expression::make_array( |
13108 | Type* type, | |
13109 | const std::vector<unsigned long>* indexes, | |
13110 | Expression_list* vals) | |
e440a328 | 13111 | { |
b13c66cd | 13112 | Location location = this->location(); |
e440a328 | 13113 | Array_type* at = type->array_type(); |
ffe743ca | 13114 | |
e440a328 | 13115 | if (at->length() != NULL && at->length()->is_nil_expression()) |
13116 | { | |
ffe743ca | 13117 | size_t size; |
13118 | if (vals == NULL) | |
13119 | size = 0; | |
00773463 | 13120 | else if (indexes != NULL) |
13121 | size = indexes->back() + 1; | |
13122 | else | |
ffe743ca | 13123 | { |
13124 | size = vals->size(); | |
13125 | Integer_type* it = Type::lookup_integer_type("int")->integer_type(); | |
13126 | if (sizeof(size) <= static_cast<size_t>(it->bits() * 8) | |
13127 | && size >> (it->bits() - 1) != 0) | |
13128 | { | |
13129 | error_at(location, "too many elements in composite literal"); | |
13130 | return Expression::make_error(location); | |
13131 | } | |
13132 | } | |
ffe743ca | 13133 | |
e67508fa | 13134 | Expression* elen = Expression::make_integer_ul(size, NULL, location); |
e440a328 | 13135 | at = Type::make_array_type(at->element_type(), elen); |
13136 | type = at; | |
13137 | } | |
ffe743ca | 13138 | else if (at->length() != NULL |
13139 | && !at->length()->is_error_expression() | |
13140 | && this->vals_ != NULL) | |
13141 | { | |
13142 | Numeric_constant nc; | |
13143 | unsigned long val; | |
13144 | if (at->length()->numeric_constant_value(&nc) | |
13145 | && nc.to_unsigned_long(&val) == Numeric_constant::NC_UL_VALID) | |
13146 | { | |
13147 | if (indexes == NULL) | |
13148 | { | |
13149 | if (this->vals_->size() > val) | |
13150 | { | |
13151 | error_at(location, "too many elements in composite literal"); | |
13152 | return Expression::make_error(location); | |
13153 | } | |
13154 | } | |
13155 | else | |
13156 | { | |
00773463 | 13157 | unsigned long max = indexes->back(); |
ffe743ca | 13158 | if (max >= val) |
13159 | { | |
13160 | error_at(location, | |
13161 | ("some element keys in composite literal " | |
13162 | "are out of range")); | |
13163 | return Expression::make_error(location); | |
13164 | } | |
13165 | } | |
13166 | } | |
13167 | } | |
13168 | ||
e440a328 | 13169 | if (at->length() != NULL) |
ffe743ca | 13170 | return new Fixed_array_construction_expression(type, indexes, vals, |
13171 | location); | |
e440a328 | 13172 | else |
2c809f8f | 13173 | return new Slice_construction_expression(type, indexes, vals, location); |
e440a328 | 13174 | } |
13175 | ||
13176 | // Lower a map composite literal. | |
13177 | ||
13178 | Expression* | |
a287720d | 13179 | Composite_literal_expression::lower_map(Gogo* gogo, Named_object* function, |
ceeb4318 | 13180 | Statement_inserter* inserter, |
a287720d | 13181 | Type* type) |
e440a328 | 13182 | { |
b13c66cd | 13183 | Location location = this->location(); |
e440a328 | 13184 | if (this->vals_ != NULL) |
13185 | { | |
13186 | if (!this->has_keys_) | |
13187 | { | |
13188 | error_at(location, "map composite literal must have keys"); | |
13189 | return Expression::make_error(location); | |
13190 | } | |
13191 | ||
a287720d | 13192 | for (Expression_list::iterator p = this->vals_->begin(); |
e440a328 | 13193 | p != this->vals_->end(); |
13194 | p += 2) | |
13195 | { | |
13196 | if (*p == NULL) | |
13197 | { | |
13198 | ++p; | |
13199 | error_at((*p)->location(), | |
13200 | "map composite literal must have keys for every value"); | |
13201 | return Expression::make_error(location); | |
13202 | } | |
a287720d | 13203 | // Make sure we have lowered the key; it may not have been |
13204 | // lowered in order to handle keys for struct composite | |
13205 | // literals. Lower it now to get the right error message. | |
13206 | if ((*p)->unknown_expression() != NULL) | |
13207 | { | |
13208 | (*p)->unknown_expression()->clear_is_composite_literal_key(); | |
ceeb4318 | 13209 | gogo->lower_expression(function, inserter, &*p); |
c484d925 | 13210 | go_assert((*p)->is_error_expression()); |
a287720d | 13211 | return Expression::make_error(location); |
13212 | } | |
e440a328 | 13213 | } |
13214 | } | |
13215 | ||
13216 | return new Map_construction_expression(type, this->vals_, location); | |
13217 | } | |
13218 | ||
d751bb78 | 13219 | // Dump ast representation for a composite literal expression. |
13220 | ||
13221 | void | |
13222 | Composite_literal_expression::do_dump_expression( | |
13223 | Ast_dump_context* ast_dump_context) const | |
13224 | { | |
8b1c301d | 13225 | ast_dump_context->ostream() << "composite("; |
d751bb78 | 13226 | ast_dump_context->dump_type(this->type_); |
13227 | ast_dump_context->ostream() << ", {"; | |
8b1c301d | 13228 | ast_dump_context->dump_expression_list(this->vals_, this->has_keys_); |
d751bb78 | 13229 | ast_dump_context->ostream() << "})"; |
13230 | } | |
13231 | ||
e440a328 | 13232 | // Make a composite literal expression. |
13233 | ||
13234 | Expression* | |
13235 | Expression::make_composite_literal(Type* type, int depth, bool has_keys, | |
62750cd5 | 13236 | Expression_list* vals, bool all_are_names, |
b13c66cd | 13237 | Location location) |
e440a328 | 13238 | { |
13239 | return new Composite_literal_expression(type, depth, has_keys, vals, | |
62750cd5 | 13240 | all_are_names, location); |
e440a328 | 13241 | } |
13242 | ||
13243 | // Return whether this expression is a composite literal. | |
13244 | ||
13245 | bool | |
13246 | Expression::is_composite_literal() const | |
13247 | { | |
13248 | switch (this->classification_) | |
13249 | { | |
13250 | case EXPRESSION_COMPOSITE_LITERAL: | |
13251 | case EXPRESSION_STRUCT_CONSTRUCTION: | |
13252 | case EXPRESSION_FIXED_ARRAY_CONSTRUCTION: | |
2c809f8f | 13253 | case EXPRESSION_SLICE_CONSTRUCTION: |
e440a328 | 13254 | case EXPRESSION_MAP_CONSTRUCTION: |
13255 | return true; | |
13256 | default: | |
13257 | return false; | |
13258 | } | |
13259 | } | |
13260 | ||
13261 | // Return whether this expression is a composite literal which is not | |
13262 | // constant. | |
13263 | ||
13264 | bool | |
13265 | Expression::is_nonconstant_composite_literal() const | |
13266 | { | |
13267 | switch (this->classification_) | |
13268 | { | |
13269 | case EXPRESSION_STRUCT_CONSTRUCTION: | |
13270 | { | |
13271 | const Struct_construction_expression *psce = | |
13272 | static_cast<const Struct_construction_expression*>(this); | |
13273 | return !psce->is_constant_struct(); | |
13274 | } | |
13275 | case EXPRESSION_FIXED_ARRAY_CONSTRUCTION: | |
13276 | { | |
13277 | const Fixed_array_construction_expression *pace = | |
13278 | static_cast<const Fixed_array_construction_expression*>(this); | |
13279 | return !pace->is_constant_array(); | |
13280 | } | |
2c809f8f | 13281 | case EXPRESSION_SLICE_CONSTRUCTION: |
e440a328 | 13282 | { |
2c809f8f | 13283 | const Slice_construction_expression *pace = |
13284 | static_cast<const Slice_construction_expression*>(this); | |
e440a328 | 13285 | return !pace->is_constant_array(); |
13286 | } | |
13287 | case EXPRESSION_MAP_CONSTRUCTION: | |
13288 | return true; | |
13289 | default: | |
13290 | return false; | |
13291 | } | |
13292 | } | |
13293 | ||
35a54f17 | 13294 | // Return true if this is a variable or temporary_variable. |
13295 | ||
13296 | bool | |
13297 | Expression::is_variable() const | |
13298 | { | |
13299 | switch (this->classification_) | |
13300 | { | |
13301 | case EXPRESSION_VAR_REFERENCE: | |
13302 | case EXPRESSION_TEMPORARY_REFERENCE: | |
13303 | case EXPRESSION_SET_AND_USE_TEMPORARY: | |
13304 | return true; | |
13305 | default: | |
13306 | return false; | |
13307 | } | |
13308 | } | |
13309 | ||
e440a328 | 13310 | // Return true if this is a reference to a local variable. |
13311 | ||
13312 | bool | |
13313 | Expression::is_local_variable() const | |
13314 | { | |
13315 | const Var_expression* ve = this->var_expression(); | |
13316 | if (ve == NULL) | |
13317 | return false; | |
13318 | const Named_object* no = ve->named_object(); | |
13319 | return (no->is_result_variable() | |
13320 | || (no->is_variable() && !no->var_value()->is_global())); | |
13321 | } | |
13322 | ||
13323 | // Class Type_guard_expression. | |
13324 | ||
13325 | // Traversal. | |
13326 | ||
13327 | int | |
13328 | Type_guard_expression::do_traverse(Traverse* traverse) | |
13329 | { | |
13330 | if (Expression::traverse(&this->expr_, traverse) == TRAVERSE_EXIT | |
13331 | || Type::traverse(this->type_, traverse) == TRAVERSE_EXIT) | |
13332 | return TRAVERSE_EXIT; | |
13333 | return TRAVERSE_CONTINUE; | |
13334 | } | |
13335 | ||
2c809f8f | 13336 | Expression* |
13337 | Type_guard_expression::do_flatten(Gogo*, Named_object*, | |
13338 | Statement_inserter* inserter) | |
13339 | { | |
5bf8be8b | 13340 | if (this->expr_->is_error_expression() |
13341 | || this->expr_->type()->is_error_type()) | |
13342 | { | |
13343 | go_assert(saw_errors()); | |
13344 | return Expression::make_error(this->location()); | |
13345 | } | |
13346 | ||
2c809f8f | 13347 | if (!this->expr_->is_variable()) |
13348 | { | |
13349 | Temporary_statement* temp = Statement::make_temporary(NULL, this->expr_, | |
13350 | this->location()); | |
13351 | inserter->insert(temp); | |
13352 | this->expr_ = | |
13353 | Expression::make_temporary_reference(temp, this->location()); | |
13354 | } | |
13355 | return this; | |
13356 | } | |
13357 | ||
e440a328 | 13358 | // Check types of a type guard expression. The expression must have |
13359 | // an interface type, but the actual type conversion is checked at run | |
13360 | // time. | |
13361 | ||
13362 | void | |
13363 | Type_guard_expression::do_check_types(Gogo*) | |
13364 | { | |
e440a328 | 13365 | Type* expr_type = this->expr_->type(); |
7e9da23f | 13366 | if (expr_type->interface_type() == NULL) |
f725ade8 | 13367 | { |
5c13bd80 | 13368 | if (!expr_type->is_error() && !this->type_->is_error()) |
f725ade8 | 13369 | this->report_error(_("type assertion only valid for interface types")); |
13370 | this->set_is_error(); | |
13371 | } | |
e440a328 | 13372 | else if (this->type_->interface_type() == NULL) |
13373 | { | |
13374 | std::string reason; | |
13375 | if (!expr_type->interface_type()->implements_interface(this->type_, | |
13376 | &reason)) | |
13377 | { | |
5c13bd80 | 13378 | if (!this->type_->is_error()) |
e440a328 | 13379 | { |
f725ade8 | 13380 | if (reason.empty()) |
13381 | this->report_error(_("impossible type assertion: " | |
13382 | "type does not implement interface")); | |
13383 | else | |
13384 | error_at(this->location(), | |
13385 | ("impossible type assertion: " | |
13386 | "type does not implement interface (%s)"), | |
13387 | reason.c_str()); | |
e440a328 | 13388 | } |
f725ade8 | 13389 | this->set_is_error(); |
e440a328 | 13390 | } |
13391 | } | |
13392 | } | |
13393 | ||
ea664253 | 13394 | // Return the backend representation for a type guard expression. |
e440a328 | 13395 | |
ea664253 | 13396 | Bexpression* |
13397 | Type_guard_expression::do_get_backend(Translate_context* context) | |
e440a328 | 13398 | { |
2c809f8f | 13399 | Expression* conversion; |
7e9da23f | 13400 | if (this->type_->interface_type() != NULL) |
2c809f8f | 13401 | conversion = |
13402 | Expression::convert_interface_to_interface(this->type_, this->expr_, | |
13403 | true, this->location()); | |
e440a328 | 13404 | else |
2c809f8f | 13405 | conversion = |
13406 | Expression::convert_for_assignment(context->gogo(), this->type_, | |
13407 | this->expr_, this->location()); | |
13408 | ||
ea664253 | 13409 | return conversion->get_backend(context); |
e440a328 | 13410 | } |
13411 | ||
d751bb78 | 13412 | // Dump ast representation for a type guard expression. |
13413 | ||
13414 | void | |
2c809f8f | 13415 | Type_guard_expression::do_dump_expression(Ast_dump_context* ast_dump_context) |
d751bb78 | 13416 | const |
13417 | { | |
13418 | this->expr_->dump_expression(ast_dump_context); | |
13419 | ast_dump_context->ostream() << "."; | |
13420 | ast_dump_context->dump_type(this->type_); | |
13421 | } | |
13422 | ||
e440a328 | 13423 | // Make a type guard expression. |
13424 | ||
13425 | Expression* | |
13426 | Expression::make_type_guard(Expression* expr, Type* type, | |
b13c66cd | 13427 | Location location) |
e440a328 | 13428 | { |
13429 | return new Type_guard_expression(expr, type, location); | |
13430 | } | |
13431 | ||
2c809f8f | 13432 | // Class Heap_expression. |
e440a328 | 13433 | |
da244e59 | 13434 | // Return the type of the expression stored on the heap. |
e440a328 | 13435 | |
da244e59 | 13436 | Type* |
13437 | Heap_expression::do_type() | |
13438 | { return Type::make_pointer_type(this->expr_->type()); } | |
e440a328 | 13439 | |
ea664253 | 13440 | // Return the backend representation for allocating an expression on the heap. |
e440a328 | 13441 | |
ea664253 | 13442 | Bexpression* |
13443 | Heap_expression::do_get_backend(Translate_context* context) | |
e440a328 | 13444 | { |
02c19a1a | 13445 | if (this->expr_->is_error_expression() || this->expr_->type()->is_error()) |
ea664253 | 13446 | return context->backend()->error_expression(); |
2c809f8f | 13447 | |
02c19a1a | 13448 | Location loc = this->location(); |
2c809f8f | 13449 | Gogo* gogo = context->gogo(); |
02c19a1a | 13450 | Btype* btype = this->type()->get_backend(gogo); |
ea664253 | 13451 | Bexpression* space = Expression::make_allocation(this->expr_->type(), |
13452 | loc)->get_backend(context); | |
02c19a1a | 13453 | |
13454 | Bstatement* decl; | |
13455 | Named_object* fn = context->function(); | |
13456 | go_assert(fn != NULL); | |
13457 | Bfunction* fndecl = fn->func_value()->get_or_make_decl(gogo, fn); | |
13458 | Bvariable* space_temp = | |
13459 | gogo->backend()->temporary_variable(fndecl, context->bblock(), btype, | |
13460 | space, true, loc, &decl); | |
13461 | space = gogo->backend()->var_expression(space_temp, loc); | |
9b27b43c | 13462 | Btype* expr_btype = this->expr_->type()->get_backend(gogo); |
13463 | Bexpression* ref = | |
13464 | gogo->backend()->indirect_expression(expr_btype, space, true, loc); | |
02c19a1a | 13465 | |
ea664253 | 13466 | Bexpression* bexpr = this->expr_->get_backend(context); |
02c19a1a | 13467 | Bstatement* assn = gogo->backend()->assignment_statement(ref, bexpr, loc); |
13468 | decl = gogo->backend()->compound_statement(decl, assn); | |
13469 | space = gogo->backend()->var_expression(space_temp, loc); | |
ea664253 | 13470 | return gogo->backend()->compound_expression(decl, space, loc); |
e440a328 | 13471 | } |
13472 | ||
2c809f8f | 13473 | // Dump ast representation for a heap expression. |
d751bb78 | 13474 | |
13475 | void | |
2c809f8f | 13476 | Heap_expression::do_dump_expression( |
d751bb78 | 13477 | Ast_dump_context* ast_dump_context) const |
13478 | { | |
13479 | ast_dump_context->ostream() << "&("; | |
13480 | ast_dump_context->dump_expression(this->expr_); | |
13481 | ast_dump_context->ostream() << ")"; | |
13482 | } | |
13483 | ||
2c809f8f | 13484 | // Allocate an expression on the heap. |
e440a328 | 13485 | |
13486 | Expression* | |
2c809f8f | 13487 | Expression::make_heap_expression(Expression* expr, Location location) |
e440a328 | 13488 | { |
2c809f8f | 13489 | return new Heap_expression(expr, location); |
e440a328 | 13490 | } |
13491 | ||
13492 | // Class Receive_expression. | |
13493 | ||
13494 | // Return the type of a receive expression. | |
13495 | ||
13496 | Type* | |
13497 | Receive_expression::do_type() | |
13498 | { | |
e429e3bd | 13499 | if (this->is_error_expression()) |
13500 | return Type::make_error_type(); | |
e440a328 | 13501 | Channel_type* channel_type = this->channel_->type()->channel_type(); |
13502 | if (channel_type == NULL) | |
e429e3bd | 13503 | { |
13504 | this->report_error(_("expected channel")); | |
13505 | return Type::make_error_type(); | |
13506 | } | |
e440a328 | 13507 | return channel_type->element_type(); |
13508 | } | |
13509 | ||
13510 | // Check types for a receive expression. | |
13511 | ||
13512 | void | |
13513 | Receive_expression::do_check_types(Gogo*) | |
13514 | { | |
13515 | Type* type = this->channel_->type(); | |
5c13bd80 | 13516 | if (type->is_error()) |
e440a328 | 13517 | { |
e429e3bd | 13518 | go_assert(saw_errors()); |
e440a328 | 13519 | this->set_is_error(); |
13520 | return; | |
13521 | } | |
13522 | if (type->channel_type() == NULL) | |
13523 | { | |
13524 | this->report_error(_("expected channel")); | |
13525 | return; | |
13526 | } | |
13527 | if (!type->channel_type()->may_receive()) | |
13528 | { | |
13529 | this->report_error(_("invalid receive on send-only channel")); | |
13530 | return; | |
13531 | } | |
13532 | } | |
13533 | ||
2c809f8f | 13534 | // Flattening for receive expressions creates a temporary variable to store |
13535 | // received data in for receives. | |
13536 | ||
13537 | Expression* | |
13538 | Receive_expression::do_flatten(Gogo*, Named_object*, | |
13539 | Statement_inserter* inserter) | |
13540 | { | |
13541 | Channel_type* channel_type = this->channel_->type()->channel_type(); | |
13542 | if (channel_type == NULL) | |
13543 | { | |
13544 | go_assert(saw_errors()); | |
13545 | return this; | |
13546 | } | |
5bf8be8b | 13547 | else if (this->channel_->is_error_expression()) |
13548 | { | |
13549 | go_assert(saw_errors()); | |
13550 | return Expression::make_error(this->location()); | |
13551 | } | |
2c809f8f | 13552 | |
13553 | Type* element_type = channel_type->element_type(); | |
13554 | if (this->temp_receiver_ == NULL) | |
13555 | { | |
13556 | this->temp_receiver_ = Statement::make_temporary(element_type, NULL, | |
13557 | this->location()); | |
13558 | this->temp_receiver_->set_is_address_taken(); | |
13559 | inserter->insert(this->temp_receiver_); | |
13560 | } | |
13561 | ||
13562 | return this; | |
13563 | } | |
13564 | ||
ea664253 | 13565 | // Get the backend representation for a receive expression. |
e440a328 | 13566 | |
ea664253 | 13567 | Bexpression* |
13568 | Receive_expression::do_get_backend(Translate_context* context) | |
e440a328 | 13569 | { |
f24f10bb | 13570 | Location loc = this->location(); |
13571 | ||
e440a328 | 13572 | Channel_type* channel_type = this->channel_->type()->channel_type(); |
5b8368f4 | 13573 | if (channel_type == NULL) |
13574 | { | |
c484d925 | 13575 | go_assert(this->channel_->type()->is_error()); |
ea664253 | 13576 | return context->backend()->error_expression(); |
5b8368f4 | 13577 | } |
f24f10bb | 13578 | Expression* td = Expression::make_type_descriptor(channel_type, loc); |
e440a328 | 13579 | |
2c809f8f | 13580 | Expression* recv_ref = |
13581 | Expression::make_temporary_reference(this->temp_receiver_, loc); | |
13582 | Expression* recv_addr = | |
13583 | Expression::make_temporary_reference(this->temp_receiver_, loc); | |
13584 | recv_addr = Expression::make_unary(OPERATOR_AND, recv_addr, loc); | |
13585 | Expression* recv = | |
13586 | Runtime::make_call(Runtime::RECEIVE, loc, 3, | |
13587 | td, this->channel_, recv_addr); | |
ea664253 | 13588 | return Expression::make_compound(recv, recv_ref, loc)->get_backend(context); |
e440a328 | 13589 | } |
13590 | ||
d751bb78 | 13591 | // Dump ast representation for a receive expression. |
13592 | ||
13593 | void | |
13594 | Receive_expression::do_dump_expression(Ast_dump_context* ast_dump_context) const | |
13595 | { | |
13596 | ast_dump_context->ostream() << " <- " ; | |
13597 | ast_dump_context->dump_expression(channel_); | |
13598 | } | |
13599 | ||
e440a328 | 13600 | // Make a receive expression. |
13601 | ||
13602 | Receive_expression* | |
b13c66cd | 13603 | Expression::make_receive(Expression* channel, Location location) |
e440a328 | 13604 | { |
13605 | return new Receive_expression(channel, location); | |
13606 | } | |
13607 | ||
e440a328 | 13608 | // An expression which evaluates to a pointer to the type descriptor |
13609 | // of a type. | |
13610 | ||
13611 | class Type_descriptor_expression : public Expression | |
13612 | { | |
13613 | public: | |
b13c66cd | 13614 | Type_descriptor_expression(Type* type, Location location) |
e440a328 | 13615 | : Expression(EXPRESSION_TYPE_DESCRIPTOR, location), |
13616 | type_(type) | |
13617 | { } | |
13618 | ||
13619 | protected: | |
4b686186 | 13620 | int |
13621 | do_traverse(Traverse*); | |
13622 | ||
e440a328 | 13623 | Type* |
13624 | do_type() | |
13625 | { return Type::make_type_descriptor_ptr_type(); } | |
13626 | ||
f9ca30f9 | 13627 | bool |
13628 | do_is_immutable() const | |
13629 | { return true; } | |
13630 | ||
e440a328 | 13631 | void |
13632 | do_determine_type(const Type_context*) | |
13633 | { } | |
13634 | ||
13635 | Expression* | |
13636 | do_copy() | |
13637 | { return this; } | |
13638 | ||
ea664253 | 13639 | Bexpression* |
13640 | do_get_backend(Translate_context* context) | |
a1d23b41 | 13641 | { |
ea664253 | 13642 | return this->type_->type_descriptor_pointer(context->gogo(), |
13643 | this->location()); | |
a1d23b41 | 13644 | } |
e440a328 | 13645 | |
d751bb78 | 13646 | void |
13647 | do_dump_expression(Ast_dump_context*) const; | |
13648 | ||
e440a328 | 13649 | private: |
13650 | // The type for which this is the descriptor. | |
13651 | Type* type_; | |
13652 | }; | |
13653 | ||
4b686186 | 13654 | int |
13655 | Type_descriptor_expression::do_traverse(Traverse* traverse) | |
13656 | { | |
13657 | if (Type::traverse(this->type_, traverse) == TRAVERSE_EXIT) | |
13658 | return TRAVERSE_EXIT; | |
13659 | return TRAVERSE_CONTINUE; | |
13660 | } | |
13661 | ||
d751bb78 | 13662 | // Dump ast representation for a type descriptor expression. |
13663 | ||
13664 | void | |
13665 | Type_descriptor_expression::do_dump_expression( | |
13666 | Ast_dump_context* ast_dump_context) const | |
13667 | { | |
13668 | ast_dump_context->dump_type(this->type_); | |
13669 | } | |
13670 | ||
e440a328 | 13671 | // Make a type descriptor expression. |
13672 | ||
13673 | Expression* | |
b13c66cd | 13674 | Expression::make_type_descriptor(Type* type, Location location) |
e440a328 | 13675 | { |
13676 | return new Type_descriptor_expression(type, location); | |
13677 | } | |
13678 | ||
aa5ae575 | 13679 | // An expression which evaluates to a pointer to the Garbage Collection symbol |
13680 | // of a type. | |
13681 | ||
13682 | class GC_symbol_expression : public Expression | |
13683 | { | |
13684 | public: | |
13685 | GC_symbol_expression(Type* type) | |
13686 | : Expression(EXPRESSION_GC_SYMBOL, Linemap::predeclared_location()), | |
13687 | type_(type) | |
13688 | {} | |
13689 | ||
13690 | protected: | |
13691 | Type* | |
13692 | do_type() | |
23d77f91 | 13693 | { return Type::lookup_integer_type("uintptr"); } |
aa5ae575 | 13694 | |
13695 | bool | |
13696 | do_is_immutable() const | |
13697 | { return true; } | |
13698 | ||
13699 | void | |
13700 | do_determine_type(const Type_context*) | |
13701 | { } | |
13702 | ||
13703 | Expression* | |
13704 | do_copy() | |
13705 | { return this; } | |
13706 | ||
13707 | Bexpression* | |
13708 | do_get_backend(Translate_context* context) | |
13709 | { return this->type_->gc_symbol_pointer(context->gogo()); } | |
13710 | ||
13711 | void | |
13712 | do_dump_expression(Ast_dump_context*) const; | |
13713 | ||
13714 | private: | |
13715 | // The type which this gc symbol describes. | |
13716 | Type* type_; | |
13717 | }; | |
13718 | ||
13719 | // Dump ast representation for a gc symbol expression. | |
13720 | ||
13721 | void | |
13722 | GC_symbol_expression::do_dump_expression( | |
13723 | Ast_dump_context* ast_dump_context) const | |
13724 | { | |
13725 | ast_dump_context->ostream() << "gcdata("; | |
13726 | ast_dump_context->dump_type(this->type_); | |
13727 | ast_dump_context->ostream() << ")"; | |
13728 | } | |
13729 | ||
13730 | // Make a gc symbol expression. | |
13731 | ||
13732 | Expression* | |
13733 | Expression::make_gc_symbol(Type* type) | |
13734 | { | |
13735 | return new GC_symbol_expression(type); | |
13736 | } | |
13737 | ||
e440a328 | 13738 | // An expression which evaluates to some characteristic of a type. |
13739 | // This is only used to initialize fields of a type descriptor. Using | |
13740 | // a new expression class is slightly inefficient but gives us a good | |
13741 | // separation between the frontend and the middle-end with regard to | |
13742 | // how types are laid out. | |
13743 | ||
13744 | class Type_info_expression : public Expression | |
13745 | { | |
13746 | public: | |
13747 | Type_info_expression(Type* type, Type_info type_info) | |
b13c66cd | 13748 | : Expression(EXPRESSION_TYPE_INFO, Linemap::predeclared_location()), |
e440a328 | 13749 | type_(type), type_info_(type_info) |
13750 | { } | |
13751 | ||
13752 | protected: | |
0e168074 | 13753 | bool |
13754 | do_is_immutable() const | |
13755 | { return true; } | |
13756 | ||
e440a328 | 13757 | Type* |
13758 | do_type(); | |
13759 | ||
13760 | void | |
13761 | do_determine_type(const Type_context*) | |
13762 | { } | |
13763 | ||
13764 | Expression* | |
13765 | do_copy() | |
13766 | { return this; } | |
13767 | ||
ea664253 | 13768 | Bexpression* |
13769 | do_get_backend(Translate_context* context); | |
e440a328 | 13770 | |
d751bb78 | 13771 | void |
13772 | do_dump_expression(Ast_dump_context*) const; | |
13773 | ||
e440a328 | 13774 | private: |
13775 | // The type for which we are getting information. | |
13776 | Type* type_; | |
13777 | // What information we want. | |
13778 | Type_info type_info_; | |
13779 | }; | |
13780 | ||
13781 | // The type is chosen to match what the type descriptor struct | |
13782 | // expects. | |
13783 | ||
13784 | Type* | |
13785 | Type_info_expression::do_type() | |
13786 | { | |
13787 | switch (this->type_info_) | |
13788 | { | |
13789 | case TYPE_INFO_SIZE: | |
13790 | return Type::lookup_integer_type("uintptr"); | |
13791 | case TYPE_INFO_ALIGNMENT: | |
13792 | case TYPE_INFO_FIELD_ALIGNMENT: | |
13793 | return Type::lookup_integer_type("uint8"); | |
13794 | default: | |
c3e6f413 | 13795 | go_unreachable(); |
e440a328 | 13796 | } |
13797 | } | |
13798 | ||
ea664253 | 13799 | // Return the backend representation for type information. |
e440a328 | 13800 | |
ea664253 | 13801 | Bexpression* |
13802 | Type_info_expression::do_get_backend(Translate_context* context) | |
e440a328 | 13803 | { |
927a01eb | 13804 | Gogo* gogo = context->gogo(); |
2a305b85 | 13805 | bool ok = true; |
3f378015 | 13806 | int64_t val; |
927a01eb | 13807 | switch (this->type_info_) |
e440a328 | 13808 | { |
927a01eb | 13809 | case TYPE_INFO_SIZE: |
2a305b85 | 13810 | ok = this->type_->backend_type_size(gogo, &val); |
927a01eb | 13811 | break; |
13812 | case TYPE_INFO_ALIGNMENT: | |
2a305b85 | 13813 | ok = this->type_->backend_type_align(gogo, &val); |
927a01eb | 13814 | break; |
13815 | case TYPE_INFO_FIELD_ALIGNMENT: | |
2a305b85 | 13816 | ok = this->type_->backend_type_field_align(gogo, &val); |
927a01eb | 13817 | break; |
13818 | default: | |
13819 | go_unreachable(); | |
e440a328 | 13820 | } |
2a305b85 | 13821 | if (!ok) |
13822 | { | |
13823 | go_assert(saw_errors()); | |
13824 | return gogo->backend()->error_expression(); | |
13825 | } | |
3f378015 | 13826 | Expression* e = Expression::make_integer_int64(val, this->type(), |
13827 | this->location()); | |
13828 | return e->get_backend(context); | |
e440a328 | 13829 | } |
13830 | ||
d751bb78 | 13831 | // Dump ast representation for a type info expression. |
13832 | ||
13833 | void | |
13834 | Type_info_expression::do_dump_expression( | |
13835 | Ast_dump_context* ast_dump_context) const | |
13836 | { | |
13837 | ast_dump_context->ostream() << "typeinfo("; | |
13838 | ast_dump_context->dump_type(this->type_); | |
13839 | ast_dump_context->ostream() << ","; | |
13840 | ast_dump_context->ostream() << | |
13841 | (this->type_info_ == TYPE_INFO_ALIGNMENT ? "alignment" | |
13842 | : this->type_info_ == TYPE_INFO_FIELD_ALIGNMENT ? "field alignment" | |
13843 | : this->type_info_ == TYPE_INFO_SIZE ? "size " | |
13844 | : "unknown"); | |
13845 | ast_dump_context->ostream() << ")"; | |
13846 | } | |
13847 | ||
e440a328 | 13848 | // Make a type info expression. |
13849 | ||
13850 | Expression* | |
13851 | Expression::make_type_info(Type* type, Type_info type_info) | |
13852 | { | |
13853 | return new Type_info_expression(type, type_info); | |
13854 | } | |
13855 | ||
35a54f17 | 13856 | // An expression that evaluates to some characteristic of a slice. |
13857 | // This is used when indexing, bound-checking, or nil checking a slice. | |
13858 | ||
13859 | class Slice_info_expression : public Expression | |
13860 | { | |
13861 | public: | |
13862 | Slice_info_expression(Expression* slice, Slice_info slice_info, | |
13863 | Location location) | |
13864 | : Expression(EXPRESSION_SLICE_INFO, location), | |
13865 | slice_(slice), slice_info_(slice_info) | |
13866 | { } | |
13867 | ||
13868 | protected: | |
13869 | Type* | |
13870 | do_type(); | |
13871 | ||
13872 | void | |
13873 | do_determine_type(const Type_context*) | |
13874 | { } | |
13875 | ||
13876 | Expression* | |
13877 | do_copy() | |
13878 | { | |
13879 | return new Slice_info_expression(this->slice_->copy(), this->slice_info_, | |
13880 | this->location()); | |
13881 | } | |
13882 | ||
ea664253 | 13883 | Bexpression* |
13884 | do_get_backend(Translate_context* context); | |
35a54f17 | 13885 | |
13886 | void | |
13887 | do_dump_expression(Ast_dump_context*) const; | |
13888 | ||
13889 | void | |
13890 | do_issue_nil_check() | |
13891 | { this->slice_->issue_nil_check(); } | |
13892 | ||
13893 | private: | |
13894 | // The slice for which we are getting information. | |
13895 | Expression* slice_; | |
13896 | // What information we want. | |
13897 | Slice_info slice_info_; | |
13898 | }; | |
13899 | ||
13900 | // Return the type of the slice info. | |
13901 | ||
13902 | Type* | |
13903 | Slice_info_expression::do_type() | |
13904 | { | |
13905 | switch (this->slice_info_) | |
13906 | { | |
13907 | case SLICE_INFO_VALUE_POINTER: | |
13908 | return Type::make_pointer_type( | |
13909 | this->slice_->type()->array_type()->element_type()); | |
13910 | case SLICE_INFO_LENGTH: | |
13911 | case SLICE_INFO_CAPACITY: | |
13912 | return Type::lookup_integer_type("int"); | |
13913 | default: | |
13914 | go_unreachable(); | |
13915 | } | |
13916 | } | |
13917 | ||
ea664253 | 13918 | // Return the backend information for slice information. |
35a54f17 | 13919 | |
ea664253 | 13920 | Bexpression* |
13921 | Slice_info_expression::do_get_backend(Translate_context* context) | |
35a54f17 | 13922 | { |
13923 | Gogo* gogo = context->gogo(); | |
ea664253 | 13924 | Bexpression* bslice = this->slice_->get_backend(context); |
35a54f17 | 13925 | switch (this->slice_info_) |
13926 | { | |
13927 | case SLICE_INFO_VALUE_POINTER: | |
13928 | case SLICE_INFO_LENGTH: | |
13929 | case SLICE_INFO_CAPACITY: | |
ea664253 | 13930 | return gogo->backend()->struct_field_expression(bslice, this->slice_info_, |
13931 | this->location()); | |
35a54f17 | 13932 | break; |
13933 | default: | |
13934 | go_unreachable(); | |
13935 | } | |
35a54f17 | 13936 | } |
13937 | ||
13938 | // Dump ast representation for a type info expression. | |
13939 | ||
13940 | void | |
13941 | Slice_info_expression::do_dump_expression( | |
13942 | Ast_dump_context* ast_dump_context) const | |
13943 | { | |
13944 | ast_dump_context->ostream() << "sliceinfo("; | |
13945 | this->slice_->dump_expression(ast_dump_context); | |
13946 | ast_dump_context->ostream() << ","; | |
13947 | ast_dump_context->ostream() << | |
13948 | (this->slice_info_ == SLICE_INFO_VALUE_POINTER ? "values" | |
13949 | : this->slice_info_ == SLICE_INFO_LENGTH ? "length" | |
13950 | : this->slice_info_ == SLICE_INFO_CAPACITY ? "capacity " | |
13951 | : "unknown"); | |
13952 | ast_dump_context->ostream() << ")"; | |
13953 | } | |
13954 | ||
13955 | // Make a slice info expression. | |
13956 | ||
13957 | Expression* | |
13958 | Expression::make_slice_info(Expression* slice, Slice_info slice_info, | |
13959 | Location location) | |
13960 | { | |
13961 | return new Slice_info_expression(slice, slice_info, location); | |
13962 | } | |
13963 | ||
2c809f8f | 13964 | // An expression that represents a slice value: a struct with value pointer, |
13965 | // length, and capacity fields. | |
13966 | ||
13967 | class Slice_value_expression : public Expression | |
13968 | { | |
13969 | public: | |
13970 | Slice_value_expression(Type* type, Expression* valptr, Expression* len, | |
13971 | Expression* cap, Location location) | |
13972 | : Expression(EXPRESSION_SLICE_VALUE, location), | |
13973 | type_(type), valptr_(valptr), len_(len), cap_(cap) | |
13974 | { } | |
13975 | ||
13976 | protected: | |
13977 | int | |
13978 | do_traverse(Traverse*); | |
13979 | ||
13980 | Type* | |
13981 | do_type() | |
13982 | { return this->type_; } | |
13983 | ||
13984 | void | |
13985 | do_determine_type(const Type_context*) | |
13986 | { go_unreachable(); } | |
13987 | ||
13988 | Expression* | |
13989 | do_copy() | |
13990 | { | |
13991 | return new Slice_value_expression(this->type_, this->valptr_->copy(), | |
13992 | this->len_->copy(), this->cap_->copy(), | |
13993 | this->location()); | |
13994 | } | |
13995 | ||
ea664253 | 13996 | Bexpression* |
13997 | do_get_backend(Translate_context* context); | |
2c809f8f | 13998 | |
13999 | void | |
14000 | do_dump_expression(Ast_dump_context*) const; | |
14001 | ||
14002 | private: | |
14003 | // The type of the slice value. | |
14004 | Type* type_; | |
14005 | // The pointer to the values in the slice. | |
14006 | Expression* valptr_; | |
14007 | // The length of the slice. | |
14008 | Expression* len_; | |
14009 | // The capacity of the slice. | |
14010 | Expression* cap_; | |
14011 | }; | |
14012 | ||
14013 | int | |
14014 | Slice_value_expression::do_traverse(Traverse* traverse) | |
14015 | { | |
55e8ba6a | 14016 | if (Type::traverse(this->type_, traverse) == TRAVERSE_EXIT |
14017 | || Expression::traverse(&this->valptr_, traverse) == TRAVERSE_EXIT | |
2c809f8f | 14018 | || Expression::traverse(&this->len_, traverse) == TRAVERSE_EXIT |
14019 | || Expression::traverse(&this->cap_, traverse) == TRAVERSE_EXIT) | |
14020 | return TRAVERSE_EXIT; | |
14021 | return TRAVERSE_CONTINUE; | |
14022 | } | |
14023 | ||
ea664253 | 14024 | Bexpression* |
14025 | Slice_value_expression::do_get_backend(Translate_context* context) | |
2c809f8f | 14026 | { |
14027 | std::vector<Bexpression*> vals(3); | |
ea664253 | 14028 | vals[0] = this->valptr_->get_backend(context); |
14029 | vals[1] = this->len_->get_backend(context); | |
14030 | vals[2] = this->cap_->get_backend(context); | |
2c809f8f | 14031 | |
14032 | Gogo* gogo = context->gogo(); | |
14033 | Btype* btype = this->type_->get_backend(gogo); | |
ea664253 | 14034 | return gogo->backend()->constructor_expression(btype, vals, this->location()); |
2c809f8f | 14035 | } |
14036 | ||
14037 | void | |
14038 | Slice_value_expression::do_dump_expression( | |
14039 | Ast_dump_context* ast_dump_context) const | |
14040 | { | |
14041 | ast_dump_context->ostream() << "slicevalue("; | |
14042 | ast_dump_context->ostream() << "values: "; | |
14043 | this->valptr_->dump_expression(ast_dump_context); | |
14044 | ast_dump_context->ostream() << ", length: "; | |
14045 | this->len_->dump_expression(ast_dump_context); | |
14046 | ast_dump_context->ostream() << ", capacity: "; | |
14047 | this->cap_->dump_expression(ast_dump_context); | |
14048 | ast_dump_context->ostream() << ")"; | |
14049 | } | |
14050 | ||
14051 | Expression* | |
14052 | Expression::make_slice_value(Type* at, Expression* valptr, Expression* len, | |
14053 | Expression* cap, Location location) | |
14054 | { | |
14055 | go_assert(at->is_slice_type()); | |
14056 | return new Slice_value_expression(at, valptr, len, cap, location); | |
14057 | } | |
2387f644 | 14058 | |
14059 | // An expression that evaluates to some characteristic of a non-empty interface. | |
14060 | // This is used to access the method table or underlying object of an interface. | |
14061 | ||
14062 | class Interface_info_expression : public Expression | |
14063 | { | |
14064 | public: | |
14065 | Interface_info_expression(Expression* iface, Interface_info iface_info, | |
2c809f8f | 14066 | Location location) |
2387f644 | 14067 | : Expression(EXPRESSION_INTERFACE_INFO, location), |
14068 | iface_(iface), iface_info_(iface_info) | |
14069 | { } | |
14070 | ||
14071 | protected: | |
14072 | Type* | |
14073 | do_type(); | |
14074 | ||
14075 | void | |
14076 | do_determine_type(const Type_context*) | |
14077 | { } | |
14078 | ||
14079 | Expression* | |
14080 | do_copy() | |
14081 | { | |
14082 | return new Interface_info_expression(this->iface_->copy(), | |
14083 | this->iface_info_, this->location()); | |
14084 | } | |
14085 | ||
ea664253 | 14086 | Bexpression* |
14087 | do_get_backend(Translate_context* context); | |
2387f644 | 14088 | |
14089 | void | |
14090 | do_dump_expression(Ast_dump_context*) const; | |
14091 | ||
14092 | void | |
14093 | do_issue_nil_check() | |
14094 | { this->iface_->issue_nil_check(); } | |
14095 | ||
14096 | private: | |
14097 | // The interface for which we are getting information. | |
14098 | Expression* iface_; | |
14099 | // What information we want. | |
14100 | Interface_info iface_info_; | |
14101 | }; | |
14102 | ||
14103 | // Return the type of the interface info. | |
14104 | ||
14105 | Type* | |
14106 | Interface_info_expression::do_type() | |
14107 | { | |
14108 | switch (this->iface_info_) | |
14109 | { | |
14110 | case INTERFACE_INFO_METHODS: | |
14111 | { | |
2c809f8f | 14112 | Type* pdt = Type::make_type_descriptor_ptr_type(); |
14113 | if (this->iface_->type()->interface_type()->is_empty()) | |
14114 | return pdt; | |
14115 | ||
2387f644 | 14116 | Location loc = this->location(); |
14117 | Struct_field_list* sfl = new Struct_field_list(); | |
2387f644 | 14118 | sfl->push_back( |
14119 | Struct_field(Typed_identifier("__type_descriptor", pdt, loc))); | |
14120 | ||
14121 | Interface_type* itype = this->iface_->type()->interface_type(); | |
14122 | for (Typed_identifier_list::const_iterator p = itype->methods()->begin(); | |
14123 | p != itype->methods()->end(); | |
14124 | ++p) | |
14125 | { | |
14126 | Function_type* ft = p->type()->function_type(); | |
14127 | go_assert(ft->receiver() == NULL); | |
14128 | ||
14129 | const Typed_identifier_list* params = ft->parameters(); | |
14130 | Typed_identifier_list* mparams = new Typed_identifier_list(); | |
14131 | if (params != NULL) | |
14132 | mparams->reserve(params->size() + 1); | |
14133 | Type* vt = Type::make_pointer_type(Type::make_void_type()); | |
14134 | mparams->push_back(Typed_identifier("", vt, ft->location())); | |
14135 | if (params != NULL) | |
14136 | { | |
14137 | for (Typed_identifier_list::const_iterator pp = params->begin(); | |
14138 | pp != params->end(); | |
14139 | ++pp) | |
14140 | mparams->push_back(*pp); | |
14141 | } | |
14142 | ||
14143 | Typed_identifier_list* mresults = (ft->results() == NULL | |
14144 | ? NULL | |
14145 | : ft->results()->copy()); | |
14146 | Backend_function_type* mft = | |
14147 | Type::make_backend_function_type(NULL, mparams, mresults, | |
14148 | ft->location()); | |
14149 | ||
14150 | std::string fname = Gogo::unpack_hidden_name(p->name()); | |
14151 | sfl->push_back(Struct_field(Typed_identifier(fname, mft, loc))); | |
14152 | } | |
14153 | ||
14154 | return Type::make_pointer_type(Type::make_struct_type(sfl, loc)); | |
14155 | } | |
14156 | case INTERFACE_INFO_OBJECT: | |
14157 | return Type::make_pointer_type(Type::make_void_type()); | |
14158 | default: | |
14159 | go_unreachable(); | |
14160 | } | |
14161 | } | |
14162 | ||
ea664253 | 14163 | // Return the backend representation for interface information. |
2387f644 | 14164 | |
ea664253 | 14165 | Bexpression* |
14166 | Interface_info_expression::do_get_backend(Translate_context* context) | |
2387f644 | 14167 | { |
14168 | Gogo* gogo = context->gogo(); | |
ea664253 | 14169 | Bexpression* biface = this->iface_->get_backend(context); |
2387f644 | 14170 | switch (this->iface_info_) |
14171 | { | |
14172 | case INTERFACE_INFO_METHODS: | |
14173 | case INTERFACE_INFO_OBJECT: | |
ea664253 | 14174 | return gogo->backend()->struct_field_expression(biface, this->iface_info_, |
14175 | this->location()); | |
2387f644 | 14176 | break; |
14177 | default: | |
14178 | go_unreachable(); | |
14179 | } | |
2387f644 | 14180 | } |
14181 | ||
14182 | // Dump ast representation for an interface info expression. | |
14183 | ||
14184 | void | |
14185 | Interface_info_expression::do_dump_expression( | |
14186 | Ast_dump_context* ast_dump_context) const | |
14187 | { | |
2c809f8f | 14188 | bool is_empty = this->iface_->type()->interface_type()->is_empty(); |
2387f644 | 14189 | ast_dump_context->ostream() << "interfaceinfo("; |
14190 | this->iface_->dump_expression(ast_dump_context); | |
14191 | ast_dump_context->ostream() << ","; | |
14192 | ast_dump_context->ostream() << | |
2c809f8f | 14193 | (this->iface_info_ == INTERFACE_INFO_METHODS && !is_empty ? "methods" |
14194 | : this->iface_info_ == INTERFACE_INFO_TYPE_DESCRIPTOR ? "type_descriptor" | |
2387f644 | 14195 | : this->iface_info_ == INTERFACE_INFO_OBJECT ? "object" |
14196 | : "unknown"); | |
14197 | ast_dump_context->ostream() << ")"; | |
14198 | } | |
14199 | ||
14200 | // Make an interface info expression. | |
14201 | ||
14202 | Expression* | |
14203 | Expression::make_interface_info(Expression* iface, Interface_info iface_info, | |
14204 | Location location) | |
14205 | { | |
14206 | return new Interface_info_expression(iface, iface_info, location); | |
14207 | } | |
14208 | ||
2c809f8f | 14209 | // An expression that represents an interface value. The first field is either |
14210 | // a type descriptor for an empty interface or a pointer to the interface method | |
14211 | // table for a non-empty interface. The second field is always the object. | |
14212 | ||
14213 | class Interface_value_expression : public Expression | |
14214 | { | |
14215 | public: | |
14216 | Interface_value_expression(Type* type, Expression* first_field, | |
14217 | Expression* obj, Location location) | |
14218 | : Expression(EXPRESSION_INTERFACE_VALUE, location), | |
14219 | type_(type), first_field_(first_field), obj_(obj) | |
14220 | { } | |
14221 | ||
14222 | protected: | |
14223 | int | |
14224 | do_traverse(Traverse*); | |
14225 | ||
14226 | Type* | |
14227 | do_type() | |
14228 | { return this->type_; } | |
14229 | ||
14230 | void | |
14231 | do_determine_type(const Type_context*) | |
14232 | { go_unreachable(); } | |
14233 | ||
14234 | Expression* | |
14235 | do_copy() | |
14236 | { | |
14237 | return new Interface_value_expression(this->type_, | |
14238 | this->first_field_->copy(), | |
14239 | this->obj_->copy(), this->location()); | |
14240 | } | |
14241 | ||
ea664253 | 14242 | Bexpression* |
14243 | do_get_backend(Translate_context* context); | |
2c809f8f | 14244 | |
14245 | void | |
14246 | do_dump_expression(Ast_dump_context*) const; | |
14247 | ||
14248 | private: | |
14249 | // The type of the interface value. | |
14250 | Type* type_; | |
14251 | // The first field of the interface (either a type descriptor or a pointer | |
14252 | // to the method table. | |
14253 | Expression* first_field_; | |
14254 | // The underlying object of the interface. | |
14255 | Expression* obj_; | |
14256 | }; | |
14257 | ||
14258 | int | |
14259 | Interface_value_expression::do_traverse(Traverse* traverse) | |
14260 | { | |
14261 | if (Expression::traverse(&this->first_field_, traverse) == TRAVERSE_EXIT | |
14262 | || Expression::traverse(&this->obj_, traverse) == TRAVERSE_EXIT) | |
14263 | return TRAVERSE_EXIT; | |
14264 | return TRAVERSE_CONTINUE; | |
14265 | } | |
14266 | ||
ea664253 | 14267 | Bexpression* |
14268 | Interface_value_expression::do_get_backend(Translate_context* context) | |
2c809f8f | 14269 | { |
14270 | std::vector<Bexpression*> vals(2); | |
ea664253 | 14271 | vals[0] = this->first_field_->get_backend(context); |
14272 | vals[1] = this->obj_->get_backend(context); | |
2c809f8f | 14273 | |
14274 | Gogo* gogo = context->gogo(); | |
14275 | Btype* btype = this->type_->get_backend(gogo); | |
ea664253 | 14276 | return gogo->backend()->constructor_expression(btype, vals, this->location()); |
2c809f8f | 14277 | } |
14278 | ||
14279 | void | |
14280 | Interface_value_expression::do_dump_expression( | |
14281 | Ast_dump_context* ast_dump_context) const | |
14282 | { | |
14283 | ast_dump_context->ostream() << "interfacevalue("; | |
14284 | ast_dump_context->ostream() << | |
14285 | (this->type_->interface_type()->is_empty() | |
14286 | ? "type_descriptor: " | |
14287 | : "methods: "); | |
14288 | this->first_field_->dump_expression(ast_dump_context); | |
14289 | ast_dump_context->ostream() << ", object: "; | |
14290 | this->obj_->dump_expression(ast_dump_context); | |
14291 | ast_dump_context->ostream() << ")"; | |
14292 | } | |
14293 | ||
14294 | Expression* | |
14295 | Expression::make_interface_value(Type* type, Expression* first_value, | |
14296 | Expression* object, Location location) | |
14297 | { | |
14298 | return new Interface_value_expression(type, first_value, object, location); | |
14299 | } | |
14300 | ||
14301 | // An interface method table for a pair of types: an interface type and a type | |
14302 | // that implements that interface. | |
14303 | ||
14304 | class Interface_mtable_expression : public Expression | |
14305 | { | |
14306 | public: | |
14307 | Interface_mtable_expression(Interface_type* itype, Type* type, | |
14308 | bool is_pointer, Location location) | |
14309 | : Expression(EXPRESSION_INTERFACE_MTABLE, location), | |
14310 | itype_(itype), type_(type), is_pointer_(is_pointer), | |
14311 | method_table_type_(NULL), bvar_(NULL) | |
14312 | { } | |
14313 | ||
14314 | protected: | |
14315 | int | |
14316 | do_traverse(Traverse*); | |
14317 | ||
14318 | Type* | |
14319 | do_type(); | |
14320 | ||
14321 | bool | |
14322 | is_immutable() const | |
14323 | { return true; } | |
14324 | ||
14325 | void | |
14326 | do_determine_type(const Type_context*) | |
14327 | { go_unreachable(); } | |
14328 | ||
14329 | Expression* | |
14330 | do_copy() | |
14331 | { | |
14332 | return new Interface_mtable_expression(this->itype_, this->type_, | |
14333 | this->is_pointer_, this->location()); | |
14334 | } | |
14335 | ||
14336 | bool | |
14337 | do_is_addressable() const | |
14338 | { return true; } | |
14339 | ||
ea664253 | 14340 | Bexpression* |
14341 | do_get_backend(Translate_context* context); | |
2c809f8f | 14342 | |
14343 | void | |
14344 | do_dump_expression(Ast_dump_context*) const; | |
14345 | ||
14346 | private: | |
14347 | // The interface type for which the methods are defined. | |
14348 | Interface_type* itype_; | |
14349 | // The type to construct the interface method table for. | |
14350 | Type* type_; | |
14351 | // Whether this table contains the method set for the receiver type or the | |
14352 | // pointer receiver type. | |
14353 | bool is_pointer_; | |
14354 | // The type of the method table. | |
14355 | Type* method_table_type_; | |
14356 | // The backend variable that refers to the interface method table. | |
14357 | Bvariable* bvar_; | |
14358 | }; | |
14359 | ||
14360 | int | |
14361 | Interface_mtable_expression::do_traverse(Traverse* traverse) | |
14362 | { | |
14363 | if (Type::traverse(this->itype_, traverse) == TRAVERSE_EXIT | |
14364 | || Type::traverse(this->type_, traverse) == TRAVERSE_EXIT) | |
14365 | return TRAVERSE_EXIT; | |
14366 | return TRAVERSE_CONTINUE; | |
14367 | } | |
14368 | ||
14369 | Type* | |
14370 | Interface_mtable_expression::do_type() | |
14371 | { | |
14372 | if (this->method_table_type_ != NULL) | |
14373 | return this->method_table_type_; | |
14374 | ||
14375 | const Typed_identifier_list* interface_methods = this->itype_->methods(); | |
14376 | go_assert(!interface_methods->empty()); | |
14377 | ||
14378 | Struct_field_list* sfl = new Struct_field_list; | |
14379 | Typed_identifier tid("__type_descriptor", Type::make_type_descriptor_ptr_type(), | |
14380 | this->location()); | |
14381 | sfl->push_back(Struct_field(tid)); | |
14382 | for (Typed_identifier_list::const_iterator p = interface_methods->begin(); | |
14383 | p != interface_methods->end(); | |
14384 | ++p) | |
14385 | sfl->push_back(Struct_field(*p)); | |
14386 | this->method_table_type_ = Type::make_struct_type(sfl, this->location()); | |
14387 | return this->method_table_type_; | |
14388 | } | |
14389 | ||
ea664253 | 14390 | Bexpression* |
14391 | Interface_mtable_expression::do_get_backend(Translate_context* context) | |
2c809f8f | 14392 | { |
14393 | Gogo* gogo = context->gogo(); | |
2c809f8f | 14394 | Location loc = Linemap::predeclared_location(); |
14395 | if (this->bvar_ != NULL) | |
ea664253 | 14396 | return gogo->backend()->var_expression(this->bvar_, this->location()); |
2c809f8f | 14397 | |
14398 | const Typed_identifier_list* interface_methods = this->itype_->methods(); | |
14399 | go_assert(!interface_methods->empty()); | |
14400 | ||
14401 | std::string mangled_name = ((this->is_pointer_ ? "__go_pimt__" : "__go_imt_") | |
14402 | + this->itype_->mangled_name(gogo) | |
14403 | + "__" | |
14404 | + this->type_->mangled_name(gogo)); | |
14405 | ||
14406 | // See whether this interface has any hidden methods. | |
14407 | bool has_hidden_methods = false; | |
14408 | for (Typed_identifier_list::const_iterator p = interface_methods->begin(); | |
14409 | p != interface_methods->end(); | |
14410 | ++p) | |
14411 | { | |
14412 | if (Gogo::is_hidden_name(p->name())) | |
14413 | { | |
14414 | has_hidden_methods = true; | |
14415 | break; | |
14416 | } | |
14417 | } | |
14418 | ||
14419 | // We already know that the named type is convertible to the | |
14420 | // interface. If the interface has hidden methods, and the named | |
14421 | // type is defined in a different package, then the interface | |
14422 | // conversion table will be defined by that other package. | |
14423 | if (has_hidden_methods | |
14424 | && this->type_->named_type() != NULL | |
14425 | && this->type_->named_type()->named_object()->package() != NULL) | |
14426 | { | |
14427 | Btype* btype = this->type()->get_backend(gogo); | |
14428 | this->bvar_ = | |
14429 | gogo->backend()->immutable_struct_reference(mangled_name, btype, loc); | |
ea664253 | 14430 | return gogo->backend()->var_expression(this->bvar_, this->location()); |
2c809f8f | 14431 | } |
14432 | ||
14433 | // The first element is the type descriptor. | |
14434 | Type* td_type; | |
14435 | if (!this->is_pointer_) | |
14436 | td_type = this->type_; | |
14437 | else | |
14438 | td_type = Type::make_pointer_type(this->type_); | |
14439 | ||
14440 | // Build an interface method table for a type: a type descriptor followed by a | |
14441 | // list of function pointers, one for each interface method. This is used for | |
14442 | // interfaces. | |
14443 | Expression_list* svals = new Expression_list(); | |
14444 | svals->push_back(Expression::make_type_descriptor(td_type, loc)); | |
14445 | ||
14446 | Named_type* nt = this->type_->named_type(); | |
14447 | Struct_type* st = this->type_->struct_type(); | |
14448 | go_assert(nt != NULL || st != NULL); | |
14449 | ||
14450 | for (Typed_identifier_list::const_iterator p = interface_methods->begin(); | |
14451 | p != interface_methods->end(); | |
14452 | ++p) | |
14453 | { | |
14454 | bool is_ambiguous; | |
14455 | Method* m; | |
14456 | if (nt != NULL) | |
14457 | m = nt->method_function(p->name(), &is_ambiguous); | |
14458 | else | |
14459 | m = st->method_function(p->name(), &is_ambiguous); | |
14460 | go_assert(m != NULL); | |
14461 | Named_object* no = m->named_object(); | |
14462 | ||
14463 | go_assert(no->is_function() || no->is_function_declaration()); | |
14464 | svals->push_back(Expression::make_func_code_reference(no, loc)); | |
14465 | } | |
14466 | ||
14467 | Btype* btype = this->type()->get_backend(gogo); | |
14468 | Expression* mtable = Expression::make_struct_composite_literal(this->type(), | |
14469 | svals, loc); | |
ea664253 | 14470 | Bexpression* ctor = mtable->get_backend(context); |
2c809f8f | 14471 | |
14472 | bool is_public = has_hidden_methods && this->type_->named_type() != NULL; | |
14473 | this->bvar_ = gogo->backend()->immutable_struct(mangled_name, false, | |
14474 | !is_public, btype, loc); | |
14475 | gogo->backend()->immutable_struct_set_init(this->bvar_, mangled_name, false, | |
14476 | !is_public, btype, loc, ctor); | |
ea664253 | 14477 | return gogo->backend()->var_expression(this->bvar_, loc); |
2c809f8f | 14478 | } |
14479 | ||
14480 | void | |
14481 | Interface_mtable_expression::do_dump_expression( | |
14482 | Ast_dump_context* ast_dump_context) const | |
14483 | { | |
14484 | ast_dump_context->ostream() << "__go_" | |
14485 | << (this->is_pointer_ ? "pimt__" : "imt_"); | |
14486 | ast_dump_context->dump_type(this->itype_); | |
14487 | ast_dump_context->ostream() << "__"; | |
14488 | ast_dump_context->dump_type(this->type_); | |
14489 | } | |
14490 | ||
14491 | Expression* | |
14492 | Expression::make_interface_mtable_ref(Interface_type* itype, Type* type, | |
14493 | bool is_pointer, Location location) | |
14494 | { | |
14495 | return new Interface_mtable_expression(itype, type, is_pointer, location); | |
14496 | } | |
14497 | ||
e440a328 | 14498 | // An expression which evaluates to the offset of a field within a |
14499 | // struct. This, like Type_info_expression, q.v., is only used to | |
14500 | // initialize fields of a type descriptor. | |
14501 | ||
14502 | class Struct_field_offset_expression : public Expression | |
14503 | { | |
14504 | public: | |
14505 | Struct_field_offset_expression(Struct_type* type, const Struct_field* field) | |
b13c66cd | 14506 | : Expression(EXPRESSION_STRUCT_FIELD_OFFSET, |
14507 | Linemap::predeclared_location()), | |
e440a328 | 14508 | type_(type), field_(field) |
14509 | { } | |
14510 | ||
14511 | protected: | |
f23d7786 | 14512 | bool |
14513 | do_is_immutable() const | |
14514 | { return true; } | |
14515 | ||
e440a328 | 14516 | Type* |
14517 | do_type() | |
14518 | { return Type::lookup_integer_type("uintptr"); } | |
14519 | ||
14520 | void | |
14521 | do_determine_type(const Type_context*) | |
14522 | { } | |
14523 | ||
14524 | Expression* | |
14525 | do_copy() | |
14526 | { return this; } | |
14527 | ||
ea664253 | 14528 | Bexpression* |
14529 | do_get_backend(Translate_context* context); | |
e440a328 | 14530 | |
d751bb78 | 14531 | void |
14532 | do_dump_expression(Ast_dump_context*) const; | |
14533 | ||
e440a328 | 14534 | private: |
14535 | // The type of the struct. | |
14536 | Struct_type* type_; | |
14537 | // The field. | |
14538 | const Struct_field* field_; | |
14539 | }; | |
14540 | ||
ea664253 | 14541 | // Return the backend representation for a struct field offset. |
e440a328 | 14542 | |
ea664253 | 14543 | Bexpression* |
14544 | Struct_field_offset_expression::do_get_backend(Translate_context* context) | |
e440a328 | 14545 | { |
e440a328 | 14546 | const Struct_field_list* fields = this->type_->fields(); |
e440a328 | 14547 | Struct_field_list::const_iterator p; |
2c8bda43 | 14548 | unsigned i = 0; |
e440a328 | 14549 | for (p = fields->begin(); |
14550 | p != fields->end(); | |
2c8bda43 | 14551 | ++p, ++i) |
14552 | if (&*p == this->field_) | |
14553 | break; | |
c484d925 | 14554 | go_assert(&*p == this->field_); |
e440a328 | 14555 | |
2c8bda43 | 14556 | Gogo* gogo = context->gogo(); |
14557 | Btype* btype = this->type_->get_backend(gogo); | |
14558 | ||
3f378015 | 14559 | int64_t offset = gogo->backend()->type_field_offset(btype, i); |
2c8bda43 | 14560 | Type* uptr_type = Type::lookup_integer_type("uintptr"); |
e67508fa | 14561 | Expression* ret = |
3f378015 | 14562 | Expression::make_integer_int64(offset, uptr_type, |
14563 | Linemap::predeclared_location()); | |
ea664253 | 14564 | return ret->get_backend(context); |
e440a328 | 14565 | } |
14566 | ||
d751bb78 | 14567 | // Dump ast representation for a struct field offset expression. |
14568 | ||
14569 | void | |
14570 | Struct_field_offset_expression::do_dump_expression( | |
14571 | Ast_dump_context* ast_dump_context) const | |
14572 | { | |
14573 | ast_dump_context->ostream() << "unsafe.Offsetof("; | |
2d29d278 | 14574 | ast_dump_context->dump_type(this->type_); |
14575 | ast_dump_context->ostream() << '.'; | |
14576 | ast_dump_context->ostream() << | |
14577 | Gogo::message_name(this->field_->field_name()); | |
d751bb78 | 14578 | ast_dump_context->ostream() << ")"; |
14579 | } | |
14580 | ||
e440a328 | 14581 | // Make an expression for a struct field offset. |
14582 | ||
14583 | Expression* | |
14584 | Expression::make_struct_field_offset(Struct_type* type, | |
14585 | const Struct_field* field) | |
14586 | { | |
14587 | return new Struct_field_offset_expression(type, field); | |
14588 | } | |
14589 | ||
a9182619 | 14590 | // An expression which evaluates to a pointer to the map descriptor of |
14591 | // a map type. | |
14592 | ||
14593 | class Map_descriptor_expression : public Expression | |
14594 | { | |
14595 | public: | |
b13c66cd | 14596 | Map_descriptor_expression(Map_type* type, Location location) |
a9182619 | 14597 | : Expression(EXPRESSION_MAP_DESCRIPTOR, location), |
14598 | type_(type) | |
14599 | { } | |
14600 | ||
14601 | protected: | |
14602 | Type* | |
14603 | do_type() | |
14604 | { return Type::make_pointer_type(Map_type::make_map_descriptor_type()); } | |
14605 | ||
14606 | void | |
14607 | do_determine_type(const Type_context*) | |
14608 | { } | |
14609 | ||
14610 | Expression* | |
14611 | do_copy() | |
14612 | { return this; } | |
14613 | ||
ea664253 | 14614 | Bexpression* |
14615 | do_get_backend(Translate_context* context) | |
a9182619 | 14616 | { |
ea664253 | 14617 | return this->type_->map_descriptor_pointer(context->gogo(), |
14618 | this->location()); | |
a9182619 | 14619 | } |
14620 | ||
d751bb78 | 14621 | void |
14622 | do_dump_expression(Ast_dump_context*) const; | |
14623 | ||
a9182619 | 14624 | private: |
14625 | // The type for which this is the descriptor. | |
14626 | Map_type* type_; | |
14627 | }; | |
14628 | ||
d751bb78 | 14629 | // Dump ast representation for a map descriptor expression. |
14630 | ||
14631 | void | |
14632 | Map_descriptor_expression::do_dump_expression( | |
14633 | Ast_dump_context* ast_dump_context) const | |
14634 | { | |
14635 | ast_dump_context->ostream() << "map_descriptor("; | |
14636 | ast_dump_context->dump_type(this->type_); | |
14637 | ast_dump_context->ostream() << ")"; | |
14638 | } | |
14639 | ||
a9182619 | 14640 | // Make a map descriptor expression. |
14641 | ||
14642 | Expression* | |
b13c66cd | 14643 | Expression::make_map_descriptor(Map_type* type, Location location) |
a9182619 | 14644 | { |
14645 | return new Map_descriptor_expression(type, location); | |
14646 | } | |
14647 | ||
e440a328 | 14648 | // An expression which evaluates to the address of an unnamed label. |
14649 | ||
14650 | class Label_addr_expression : public Expression | |
14651 | { | |
14652 | public: | |
b13c66cd | 14653 | Label_addr_expression(Label* label, Location location) |
e440a328 | 14654 | : Expression(EXPRESSION_LABEL_ADDR, location), |
14655 | label_(label) | |
14656 | { } | |
14657 | ||
14658 | protected: | |
14659 | Type* | |
14660 | do_type() | |
14661 | { return Type::make_pointer_type(Type::make_void_type()); } | |
14662 | ||
14663 | void | |
14664 | do_determine_type(const Type_context*) | |
14665 | { } | |
14666 | ||
14667 | Expression* | |
14668 | do_copy() | |
14669 | { return new Label_addr_expression(this->label_, this->location()); } | |
14670 | ||
ea664253 | 14671 | Bexpression* |
14672 | do_get_backend(Translate_context* context) | |
14673 | { return this->label_->get_addr(context, this->location()); } | |
e440a328 | 14674 | |
d751bb78 | 14675 | void |
14676 | do_dump_expression(Ast_dump_context* ast_dump_context) const | |
14677 | { ast_dump_context->ostream() << this->label_->name(); } | |
14678 | ||
e440a328 | 14679 | private: |
14680 | // The label whose address we are taking. | |
14681 | Label* label_; | |
14682 | }; | |
14683 | ||
14684 | // Make an expression for the address of an unnamed label. | |
14685 | ||
14686 | Expression* | |
b13c66cd | 14687 | Expression::make_label_addr(Label* label, Location location) |
e440a328 | 14688 | { |
14689 | return new Label_addr_expression(label, location); | |
14690 | } | |
14691 | ||
da244e59 | 14692 | // Class Conditional_expression. |
283a177b | 14693 | |
2c809f8f | 14694 | // Traversal. |
14695 | ||
14696 | int | |
14697 | Conditional_expression::do_traverse(Traverse* traverse) | |
14698 | { | |
14699 | if (Expression::traverse(&this->cond_, traverse) == TRAVERSE_EXIT | |
14700 | || Expression::traverse(&this->then_, traverse) == TRAVERSE_EXIT | |
14701 | || Expression::traverse(&this->else_, traverse) == TRAVERSE_EXIT) | |
14702 | return TRAVERSE_EXIT; | |
14703 | return TRAVERSE_CONTINUE; | |
14704 | } | |
14705 | ||
283a177b | 14706 | // Return the type of the conditional expression. |
14707 | ||
14708 | Type* | |
14709 | Conditional_expression::do_type() | |
14710 | { | |
14711 | Type* result_type = Type::make_void_type(); | |
2c809f8f | 14712 | if (Type::are_identical(this->then_->type(), this->else_->type(), false, |
14713 | NULL)) | |
283a177b | 14714 | result_type = this->then_->type(); |
14715 | else if (this->then_->is_nil_expression() | |
14716 | || this->else_->is_nil_expression()) | |
14717 | result_type = (!this->then_->is_nil_expression() | |
14718 | ? this->then_->type() | |
14719 | : this->else_->type()); | |
14720 | return result_type; | |
14721 | } | |
14722 | ||
2c809f8f | 14723 | // Determine type for a conditional expression. |
14724 | ||
14725 | void | |
14726 | Conditional_expression::do_determine_type(const Type_context* context) | |
14727 | { | |
14728 | this->cond_->determine_type_no_context(); | |
14729 | this->then_->determine_type(context); | |
14730 | this->else_->determine_type(context); | |
14731 | } | |
14732 | ||
283a177b | 14733 | // Get the backend representation of a conditional expression. |
14734 | ||
ea664253 | 14735 | Bexpression* |
14736 | Conditional_expression::do_get_backend(Translate_context* context) | |
283a177b | 14737 | { |
14738 | Gogo* gogo = context->gogo(); | |
14739 | Btype* result_btype = this->type()->get_backend(gogo); | |
ea664253 | 14740 | Bexpression* cond = this->cond_->get_backend(context); |
14741 | Bexpression* then = this->then_->get_backend(context); | |
14742 | Bexpression* belse = this->else_->get_backend(context); | |
14743 | return gogo->backend()->conditional_expression(result_btype, cond, then, | |
14744 | belse, this->location()); | |
283a177b | 14745 | } |
14746 | ||
14747 | // Dump ast representation of a conditional expression. | |
14748 | ||
14749 | void | |
14750 | Conditional_expression::do_dump_expression( | |
14751 | Ast_dump_context* ast_dump_context) const | |
14752 | { | |
14753 | ast_dump_context->ostream() << "("; | |
14754 | ast_dump_context->dump_expression(this->cond_); | |
14755 | ast_dump_context->ostream() << " ? "; | |
14756 | ast_dump_context->dump_expression(this->then_); | |
14757 | ast_dump_context->ostream() << " : "; | |
14758 | ast_dump_context->dump_expression(this->else_); | |
14759 | ast_dump_context->ostream() << ") "; | |
14760 | } | |
14761 | ||
14762 | // Make a conditional expression. | |
14763 | ||
14764 | Expression* | |
14765 | Expression::make_conditional(Expression* cond, Expression* then, | |
14766 | Expression* else_expr, Location location) | |
14767 | { | |
14768 | return new Conditional_expression(cond, then, else_expr, location); | |
14769 | } | |
14770 | ||
da244e59 | 14771 | // Class Compound_expression. |
2c809f8f | 14772 | |
14773 | // Traversal. | |
14774 | ||
14775 | int | |
14776 | Compound_expression::do_traverse(Traverse* traverse) | |
14777 | { | |
14778 | if (Expression::traverse(&this->init_, traverse) == TRAVERSE_EXIT | |
14779 | || Expression::traverse(&this->expr_, traverse) == TRAVERSE_EXIT) | |
14780 | return TRAVERSE_EXIT; | |
14781 | return TRAVERSE_CONTINUE; | |
14782 | } | |
14783 | ||
14784 | // Return the type of the compound expression. | |
14785 | ||
14786 | Type* | |
14787 | Compound_expression::do_type() | |
14788 | { | |
14789 | return this->expr_->type(); | |
14790 | } | |
14791 | ||
14792 | // Determine type for a compound expression. | |
14793 | ||
14794 | void | |
14795 | Compound_expression::do_determine_type(const Type_context* context) | |
14796 | { | |
14797 | this->init_->determine_type_no_context(); | |
14798 | this->expr_->determine_type(context); | |
14799 | } | |
14800 | ||
14801 | // Get the backend representation of a compound expression. | |
14802 | ||
ea664253 | 14803 | Bexpression* |
14804 | Compound_expression::do_get_backend(Translate_context* context) | |
2c809f8f | 14805 | { |
14806 | Gogo* gogo = context->gogo(); | |
ea664253 | 14807 | Bexpression* binit = this->init_->get_backend(context); |
2c809f8f | 14808 | Bstatement* init_stmt = gogo->backend()->expression_statement(binit); |
ea664253 | 14809 | Bexpression* bexpr = this->expr_->get_backend(context); |
14810 | return gogo->backend()->compound_expression(init_stmt, bexpr, | |
14811 | this->location()); | |
2c809f8f | 14812 | } |
14813 | ||
14814 | // Dump ast representation of a conditional expression. | |
14815 | ||
14816 | void | |
14817 | Compound_expression::do_dump_expression( | |
14818 | Ast_dump_context* ast_dump_context) const | |
14819 | { | |
14820 | ast_dump_context->ostream() << "("; | |
14821 | ast_dump_context->dump_expression(this->init_); | |
14822 | ast_dump_context->ostream() << ","; | |
14823 | ast_dump_context->dump_expression(this->expr_); | |
14824 | ast_dump_context->ostream() << ") "; | |
14825 | } | |
14826 | ||
14827 | // Make a compound expression. | |
14828 | ||
14829 | Expression* | |
14830 | Expression::make_compound(Expression* init, Expression* expr, Location location) | |
14831 | { | |
14832 | return new Compound_expression(init, expr, location); | |
14833 | } | |
14834 | ||
e440a328 | 14835 | // Import an expression. This comes at the end in order to see the |
14836 | // various class definitions. | |
14837 | ||
14838 | Expression* | |
14839 | Expression::import_expression(Import* imp) | |
14840 | { | |
14841 | int c = imp->peek_char(); | |
14842 | if (imp->match_c_string("- ") | |
14843 | || imp->match_c_string("! ") | |
14844 | || imp->match_c_string("^ ")) | |
14845 | return Unary_expression::do_import(imp); | |
14846 | else if (c == '(') | |
14847 | return Binary_expression::do_import(imp); | |
14848 | else if (imp->match_c_string("true") | |
14849 | || imp->match_c_string("false")) | |
14850 | return Boolean_expression::do_import(imp); | |
14851 | else if (c == '"') | |
14852 | return String_expression::do_import(imp); | |
14853 | else if (c == '-' || (c >= '0' && c <= '9')) | |
14854 | { | |
14855 | // This handles integers, floats and complex constants. | |
14856 | return Integer_expression::do_import(imp); | |
14857 | } | |
14858 | else if (imp->match_c_string("nil")) | |
14859 | return Nil_expression::do_import(imp); | |
14860 | else if (imp->match_c_string("convert")) | |
14861 | return Type_conversion_expression::do_import(imp); | |
14862 | else | |
14863 | { | |
14864 | error_at(imp->location(), "import error: expected expression"); | |
14865 | return Expression::make_error(imp->location()); | |
14866 | } | |
14867 | } | |
14868 | ||
14869 | // Class Expression_list. | |
14870 | ||
14871 | // Traverse the list. | |
14872 | ||
14873 | int | |
14874 | Expression_list::traverse(Traverse* traverse) | |
14875 | { | |
14876 | for (Expression_list::iterator p = this->begin(); | |
14877 | p != this->end(); | |
14878 | ++p) | |
14879 | { | |
14880 | if (*p != NULL) | |
14881 | { | |
14882 | if (Expression::traverse(&*p, traverse) == TRAVERSE_EXIT) | |
14883 | return TRAVERSE_EXIT; | |
14884 | } | |
14885 | } | |
14886 | return TRAVERSE_CONTINUE; | |
14887 | } | |
14888 | ||
14889 | // Copy the list. | |
14890 | ||
14891 | Expression_list* | |
14892 | Expression_list::copy() | |
14893 | { | |
14894 | Expression_list* ret = new Expression_list(); | |
14895 | for (Expression_list::iterator p = this->begin(); | |
14896 | p != this->end(); | |
14897 | ++p) | |
14898 | { | |
14899 | if (*p == NULL) | |
14900 | ret->push_back(NULL); | |
14901 | else | |
14902 | ret->push_back((*p)->copy()); | |
14903 | } | |
14904 | return ret; | |
14905 | } | |
14906 | ||
14907 | // Return whether an expression list has an error expression. | |
14908 | ||
14909 | bool | |
14910 | Expression_list::contains_error() const | |
14911 | { | |
14912 | for (Expression_list::const_iterator p = this->begin(); | |
14913 | p != this->end(); | |
14914 | ++p) | |
14915 | if (*p != NULL && (*p)->is_error_expression()) | |
14916 | return true; | |
14917 | return false; | |
14918 | } | |
0c77715b | 14919 | |
14920 | // Class Numeric_constant. | |
14921 | ||
14922 | // Destructor. | |
14923 | ||
14924 | Numeric_constant::~Numeric_constant() | |
14925 | { | |
14926 | this->clear(); | |
14927 | } | |
14928 | ||
14929 | // Copy constructor. | |
14930 | ||
14931 | Numeric_constant::Numeric_constant(const Numeric_constant& a) | |
14932 | : classification_(a.classification_), type_(a.type_) | |
14933 | { | |
14934 | switch (a.classification_) | |
14935 | { | |
14936 | case NC_INVALID: | |
14937 | break; | |
14938 | case NC_INT: | |
14939 | case NC_RUNE: | |
14940 | mpz_init_set(this->u_.int_val, a.u_.int_val); | |
14941 | break; | |
14942 | case NC_FLOAT: | |
14943 | mpfr_init_set(this->u_.float_val, a.u_.float_val, GMP_RNDN); | |
14944 | break; | |
14945 | case NC_COMPLEX: | |
fcbea5e4 | 14946 | mpc_init2(this->u_.complex_val, mpc_precision); |
14947 | mpc_set(this->u_.complex_val, a.u_.complex_val, MPC_RNDNN); | |
0c77715b | 14948 | break; |
14949 | default: | |
14950 | go_unreachable(); | |
14951 | } | |
14952 | } | |
14953 | ||
14954 | // Assignment operator. | |
14955 | ||
14956 | Numeric_constant& | |
14957 | Numeric_constant::operator=(const Numeric_constant& a) | |
14958 | { | |
14959 | this->clear(); | |
14960 | this->classification_ = a.classification_; | |
14961 | this->type_ = a.type_; | |
14962 | switch (a.classification_) | |
14963 | { | |
14964 | case NC_INVALID: | |
14965 | break; | |
14966 | case NC_INT: | |
14967 | case NC_RUNE: | |
14968 | mpz_init_set(this->u_.int_val, a.u_.int_val); | |
14969 | break; | |
14970 | case NC_FLOAT: | |
14971 | mpfr_init_set(this->u_.float_val, a.u_.float_val, GMP_RNDN); | |
14972 | break; | |
14973 | case NC_COMPLEX: | |
fcbea5e4 | 14974 | mpc_init2(this->u_.complex_val, mpc_precision); |
14975 | mpc_set(this->u_.complex_val, a.u_.complex_val, MPC_RNDNN); | |
0c77715b | 14976 | break; |
14977 | default: | |
14978 | go_unreachable(); | |
14979 | } | |
14980 | return *this; | |
14981 | } | |
14982 | ||
14983 | // Clear the contents. | |
14984 | ||
14985 | void | |
14986 | Numeric_constant::clear() | |
14987 | { | |
14988 | switch (this->classification_) | |
14989 | { | |
14990 | case NC_INVALID: | |
14991 | break; | |
14992 | case NC_INT: | |
14993 | case NC_RUNE: | |
14994 | mpz_clear(this->u_.int_val); | |
14995 | break; | |
14996 | case NC_FLOAT: | |
14997 | mpfr_clear(this->u_.float_val); | |
14998 | break; | |
14999 | case NC_COMPLEX: | |
fcbea5e4 | 15000 | mpc_clear(this->u_.complex_val); |
0c77715b | 15001 | break; |
15002 | default: | |
15003 | go_unreachable(); | |
15004 | } | |
15005 | this->classification_ = NC_INVALID; | |
15006 | } | |
15007 | ||
15008 | // Set to an unsigned long value. | |
15009 | ||
15010 | void | |
15011 | Numeric_constant::set_unsigned_long(Type* type, unsigned long val) | |
15012 | { | |
15013 | this->clear(); | |
15014 | this->classification_ = NC_INT; | |
15015 | this->type_ = type; | |
15016 | mpz_init_set_ui(this->u_.int_val, val); | |
15017 | } | |
15018 | ||
15019 | // Set to an integer value. | |
15020 | ||
15021 | void | |
15022 | Numeric_constant::set_int(Type* type, const mpz_t val) | |
15023 | { | |
15024 | this->clear(); | |
15025 | this->classification_ = NC_INT; | |
15026 | this->type_ = type; | |
15027 | mpz_init_set(this->u_.int_val, val); | |
15028 | } | |
15029 | ||
15030 | // Set to a rune value. | |
15031 | ||
15032 | void | |
15033 | Numeric_constant::set_rune(Type* type, const mpz_t val) | |
15034 | { | |
15035 | this->clear(); | |
15036 | this->classification_ = NC_RUNE; | |
15037 | this->type_ = type; | |
15038 | mpz_init_set(this->u_.int_val, val); | |
15039 | } | |
15040 | ||
15041 | // Set to a floating point value. | |
15042 | ||
15043 | void | |
15044 | Numeric_constant::set_float(Type* type, const mpfr_t val) | |
15045 | { | |
15046 | this->clear(); | |
15047 | this->classification_ = NC_FLOAT; | |
15048 | this->type_ = type; | |
833b523c | 15049 | // Numeric constants do not have negative zero values, so remove |
15050 | // them here. They also don't have infinity or NaN values, but we | |
15051 | // should never see them here. | |
15052 | if (mpfr_zero_p(val)) | |
15053 | mpfr_init_set_ui(this->u_.float_val, 0, GMP_RNDN); | |
15054 | else | |
15055 | mpfr_init_set(this->u_.float_val, val, GMP_RNDN); | |
0c77715b | 15056 | } |
15057 | ||
15058 | // Set to a complex value. | |
15059 | ||
15060 | void | |
fcbea5e4 | 15061 | Numeric_constant::set_complex(Type* type, const mpc_t val) |
0c77715b | 15062 | { |
15063 | this->clear(); | |
15064 | this->classification_ = NC_COMPLEX; | |
15065 | this->type_ = type; | |
fcbea5e4 | 15066 | mpc_init2(this->u_.complex_val, mpc_precision); |
15067 | mpc_set(this->u_.complex_val, val, MPC_RNDNN); | |
0c77715b | 15068 | } |
15069 | ||
15070 | // Get an int value. | |
15071 | ||
15072 | void | |
15073 | Numeric_constant::get_int(mpz_t* val) const | |
15074 | { | |
15075 | go_assert(this->is_int()); | |
15076 | mpz_init_set(*val, this->u_.int_val); | |
15077 | } | |
15078 | ||
15079 | // Get a rune value. | |
15080 | ||
15081 | void | |
15082 | Numeric_constant::get_rune(mpz_t* val) const | |
15083 | { | |
15084 | go_assert(this->is_rune()); | |
15085 | mpz_init_set(*val, this->u_.int_val); | |
15086 | } | |
15087 | ||
15088 | // Get a floating point value. | |
15089 | ||
15090 | void | |
15091 | Numeric_constant::get_float(mpfr_t* val) const | |
15092 | { | |
15093 | go_assert(this->is_float()); | |
15094 | mpfr_init_set(*val, this->u_.float_val, GMP_RNDN); | |
15095 | } | |
15096 | ||
15097 | // Get a complex value. | |
15098 | ||
15099 | void | |
fcbea5e4 | 15100 | Numeric_constant::get_complex(mpc_t* val) const |
0c77715b | 15101 | { |
15102 | go_assert(this->is_complex()); | |
fcbea5e4 | 15103 | mpc_init2(*val, mpc_precision); |
15104 | mpc_set(*val, this->u_.complex_val, MPC_RNDNN); | |
0c77715b | 15105 | } |
15106 | ||
15107 | // Express value as unsigned long if possible. | |
15108 | ||
15109 | Numeric_constant::To_unsigned_long | |
15110 | Numeric_constant::to_unsigned_long(unsigned long* val) const | |
15111 | { | |
15112 | switch (this->classification_) | |
15113 | { | |
15114 | case NC_INT: | |
15115 | case NC_RUNE: | |
15116 | return this->mpz_to_unsigned_long(this->u_.int_val, val); | |
15117 | case NC_FLOAT: | |
15118 | return this->mpfr_to_unsigned_long(this->u_.float_val, val); | |
15119 | case NC_COMPLEX: | |
fcbea5e4 | 15120 | if (!mpfr_zero_p(mpc_imagref(this->u_.complex_val))) |
0c77715b | 15121 | return NC_UL_NOTINT; |
fcbea5e4 | 15122 | return this->mpfr_to_unsigned_long(mpc_realref(this->u_.complex_val), |
15123 | val); | |
0c77715b | 15124 | default: |
15125 | go_unreachable(); | |
15126 | } | |
15127 | } | |
15128 | ||
15129 | // Express integer value as unsigned long if possible. | |
15130 | ||
15131 | Numeric_constant::To_unsigned_long | |
15132 | Numeric_constant::mpz_to_unsigned_long(const mpz_t ival, | |
15133 | unsigned long *val) const | |
15134 | { | |
15135 | if (mpz_sgn(ival) < 0) | |
15136 | return NC_UL_NEGATIVE; | |
15137 | unsigned long ui = mpz_get_ui(ival); | |
15138 | if (mpz_cmp_ui(ival, ui) != 0) | |
15139 | return NC_UL_BIG; | |
15140 | *val = ui; | |
15141 | return NC_UL_VALID; | |
15142 | } | |
15143 | ||
15144 | // Express floating point value as unsigned long if possible. | |
15145 | ||
15146 | Numeric_constant::To_unsigned_long | |
15147 | Numeric_constant::mpfr_to_unsigned_long(const mpfr_t fval, | |
15148 | unsigned long *val) const | |
15149 | { | |
15150 | if (!mpfr_integer_p(fval)) | |
15151 | return NC_UL_NOTINT; | |
15152 | mpz_t ival; | |
15153 | mpz_init(ival); | |
15154 | mpfr_get_z(ival, fval, GMP_RNDN); | |
15155 | To_unsigned_long ret = this->mpz_to_unsigned_long(ival, val); | |
15156 | mpz_clear(ival); | |
15157 | return ret; | |
15158 | } | |
15159 | ||
15160 | // Convert value to integer if possible. | |
15161 | ||
15162 | bool | |
15163 | Numeric_constant::to_int(mpz_t* val) const | |
15164 | { | |
15165 | switch (this->classification_) | |
15166 | { | |
15167 | case NC_INT: | |
15168 | case NC_RUNE: | |
15169 | mpz_init_set(*val, this->u_.int_val); | |
15170 | return true; | |
15171 | case NC_FLOAT: | |
15172 | if (!mpfr_integer_p(this->u_.float_val)) | |
15173 | return false; | |
15174 | mpz_init(*val); | |
15175 | mpfr_get_z(*val, this->u_.float_val, GMP_RNDN); | |
15176 | return true; | |
15177 | case NC_COMPLEX: | |
fcbea5e4 | 15178 | if (!mpfr_zero_p(mpc_imagref(this->u_.complex_val)) |
15179 | || !mpfr_integer_p(mpc_realref(this->u_.complex_val))) | |
0c77715b | 15180 | return false; |
15181 | mpz_init(*val); | |
fcbea5e4 | 15182 | mpfr_get_z(*val, mpc_realref(this->u_.complex_val), GMP_RNDN); |
0c77715b | 15183 | return true; |
15184 | default: | |
15185 | go_unreachable(); | |
15186 | } | |
15187 | } | |
15188 | ||
15189 | // Convert value to floating point if possible. | |
15190 | ||
15191 | bool | |
15192 | Numeric_constant::to_float(mpfr_t* val) const | |
15193 | { | |
15194 | switch (this->classification_) | |
15195 | { | |
15196 | case NC_INT: | |
15197 | case NC_RUNE: | |
15198 | mpfr_init_set_z(*val, this->u_.int_val, GMP_RNDN); | |
15199 | return true; | |
15200 | case NC_FLOAT: | |
15201 | mpfr_init_set(*val, this->u_.float_val, GMP_RNDN); | |
15202 | return true; | |
15203 | case NC_COMPLEX: | |
fcbea5e4 | 15204 | if (!mpfr_zero_p(mpc_imagref(this->u_.complex_val))) |
0c77715b | 15205 | return false; |
fcbea5e4 | 15206 | mpfr_init_set(*val, mpc_realref(this->u_.complex_val), GMP_RNDN); |
0c77715b | 15207 | return true; |
15208 | default: | |
15209 | go_unreachable(); | |
15210 | } | |
15211 | } | |
15212 | ||
15213 | // Convert value to complex. | |
15214 | ||
15215 | bool | |
fcbea5e4 | 15216 | Numeric_constant::to_complex(mpc_t* val) const |
0c77715b | 15217 | { |
fcbea5e4 | 15218 | mpc_init2(*val, mpc_precision); |
0c77715b | 15219 | switch (this->classification_) |
15220 | { | |
15221 | case NC_INT: | |
15222 | case NC_RUNE: | |
fcbea5e4 | 15223 | mpc_set_z(*val, this->u_.int_val, MPC_RNDNN); |
0c77715b | 15224 | return true; |
15225 | case NC_FLOAT: | |
fcbea5e4 | 15226 | mpc_set_fr(*val, this->u_.float_val, MPC_RNDNN); |
0c77715b | 15227 | return true; |
15228 | case NC_COMPLEX: | |
fcbea5e4 | 15229 | mpc_set(*val, this->u_.complex_val, MPC_RNDNN); |
0c77715b | 15230 | return true; |
15231 | default: | |
15232 | go_unreachable(); | |
15233 | } | |
15234 | } | |
15235 | ||
15236 | // Get the type. | |
15237 | ||
15238 | Type* | |
15239 | Numeric_constant::type() const | |
15240 | { | |
15241 | if (this->type_ != NULL) | |
15242 | return this->type_; | |
15243 | switch (this->classification_) | |
15244 | { | |
15245 | case NC_INT: | |
15246 | return Type::make_abstract_integer_type(); | |
15247 | case NC_RUNE: | |
15248 | return Type::make_abstract_character_type(); | |
15249 | case NC_FLOAT: | |
15250 | return Type::make_abstract_float_type(); | |
15251 | case NC_COMPLEX: | |
15252 | return Type::make_abstract_complex_type(); | |
15253 | default: | |
15254 | go_unreachable(); | |
15255 | } | |
15256 | } | |
15257 | ||
15258 | // If the constant can be expressed in TYPE, then set the type of the | |
15259 | // constant to TYPE and return true. Otherwise return false, and, if | |
15260 | // ISSUE_ERROR is true, report an appropriate error message. | |
15261 | ||
15262 | bool | |
15263 | Numeric_constant::set_type(Type* type, bool issue_error, Location loc) | |
15264 | { | |
15265 | bool ret; | |
f11c2155 | 15266 | if (type == NULL || type->is_error()) |
0c77715b | 15267 | ret = true; |
15268 | else if (type->integer_type() != NULL) | |
15269 | ret = this->check_int_type(type->integer_type(), issue_error, loc); | |
15270 | else if (type->float_type() != NULL) | |
15271 | ret = this->check_float_type(type->float_type(), issue_error, loc); | |
15272 | else if (type->complex_type() != NULL) | |
15273 | ret = this->check_complex_type(type->complex_type(), issue_error, loc); | |
15274 | else | |
5706ab68 | 15275 | { |
15276 | ret = false; | |
15277 | if (issue_error) | |
15278 | go_assert(saw_errors()); | |
15279 | } | |
0c77715b | 15280 | if (ret) |
15281 | this->type_ = type; | |
15282 | return ret; | |
15283 | } | |
15284 | ||
15285 | // Check whether the constant can be expressed in an integer type. | |
15286 | ||
15287 | bool | |
15288 | Numeric_constant::check_int_type(Integer_type* type, bool issue_error, | |
71a45216 | 15289 | Location location) |
0c77715b | 15290 | { |
15291 | mpz_t val; | |
15292 | switch (this->classification_) | |
15293 | { | |
15294 | case NC_INT: | |
15295 | case NC_RUNE: | |
15296 | mpz_init_set(val, this->u_.int_val); | |
15297 | break; | |
15298 | ||
15299 | case NC_FLOAT: | |
15300 | if (!mpfr_integer_p(this->u_.float_val)) | |
15301 | { | |
15302 | if (issue_error) | |
71a45216 | 15303 | { |
15304 | error_at(location, | |
15305 | "floating point constant truncated to integer"); | |
15306 | this->set_invalid(); | |
15307 | } | |
0c77715b | 15308 | return false; |
15309 | } | |
15310 | mpz_init(val); | |
15311 | mpfr_get_z(val, this->u_.float_val, GMP_RNDN); | |
15312 | break; | |
15313 | ||
15314 | case NC_COMPLEX: | |
fcbea5e4 | 15315 | if (!mpfr_integer_p(mpc_realref(this->u_.complex_val)) |
15316 | || !mpfr_zero_p(mpc_imagref(this->u_.complex_val))) | |
0c77715b | 15317 | { |
15318 | if (issue_error) | |
71a45216 | 15319 | { |
15320 | error_at(location, "complex constant truncated to integer"); | |
15321 | this->set_invalid(); | |
15322 | } | |
0c77715b | 15323 | return false; |
15324 | } | |
15325 | mpz_init(val); | |
fcbea5e4 | 15326 | mpfr_get_z(val, mpc_realref(this->u_.complex_val), GMP_RNDN); |
0c77715b | 15327 | break; |
15328 | ||
15329 | default: | |
15330 | go_unreachable(); | |
15331 | } | |
15332 | ||
15333 | bool ret; | |
15334 | if (type->is_abstract()) | |
15335 | ret = true; | |
15336 | else | |
15337 | { | |
15338 | int bits = mpz_sizeinbase(val, 2); | |
15339 | if (type->is_unsigned()) | |
15340 | { | |
15341 | // For an unsigned type we can only accept a nonnegative | |
15342 | // number, and we must be able to represents at least BITS. | |
15343 | ret = mpz_sgn(val) >= 0 && bits <= type->bits(); | |
15344 | } | |
15345 | else | |
15346 | { | |
15347 | // For a signed type we need an extra bit to indicate the | |
15348 | // sign. We have to handle the most negative integer | |
15349 | // specially. | |
15350 | ret = (bits + 1 <= type->bits() | |
15351 | || (bits <= type->bits() | |
15352 | && mpz_sgn(val) < 0 | |
15353 | && (mpz_scan1(val, 0) | |
15354 | == static_cast<unsigned long>(type->bits() - 1)) | |
15355 | && mpz_scan0(val, type->bits()) == ULONG_MAX)); | |
15356 | } | |
15357 | } | |
15358 | ||
15359 | if (!ret && issue_error) | |
71a45216 | 15360 | { |
15361 | error_at(location, "integer constant overflow"); | |
15362 | this->set_invalid(); | |
15363 | } | |
0c77715b | 15364 | |
15365 | return ret; | |
15366 | } | |
15367 | ||
15368 | // Check whether the constant can be expressed in a floating point | |
15369 | // type. | |
15370 | ||
15371 | bool | |
15372 | Numeric_constant::check_float_type(Float_type* type, bool issue_error, | |
d0bcce51 | 15373 | Location location) |
0c77715b | 15374 | { |
15375 | mpfr_t val; | |
15376 | switch (this->classification_) | |
15377 | { | |
15378 | case NC_INT: | |
15379 | case NC_RUNE: | |
15380 | mpfr_init_set_z(val, this->u_.int_val, GMP_RNDN); | |
15381 | break; | |
15382 | ||
15383 | case NC_FLOAT: | |
15384 | mpfr_init_set(val, this->u_.float_val, GMP_RNDN); | |
15385 | break; | |
15386 | ||
15387 | case NC_COMPLEX: | |
fcbea5e4 | 15388 | if (!mpfr_zero_p(mpc_imagref(this->u_.complex_val))) |
0c77715b | 15389 | { |
15390 | if (issue_error) | |
71a45216 | 15391 | { |
15392 | this->set_invalid(); | |
15393 | error_at(location, "complex constant truncated to float"); | |
15394 | } | |
0c77715b | 15395 | return false; |
15396 | } | |
fcbea5e4 | 15397 | mpfr_init_set(val, mpc_realref(this->u_.complex_val), GMP_RNDN); |
0c77715b | 15398 | break; |
15399 | ||
15400 | default: | |
15401 | go_unreachable(); | |
15402 | } | |
15403 | ||
15404 | bool ret; | |
15405 | if (type->is_abstract()) | |
15406 | ret = true; | |
15407 | else if (mpfr_nan_p(val) || mpfr_inf_p(val) || mpfr_zero_p(val)) | |
15408 | { | |
15409 | // A NaN or Infinity always fits in the range of the type. | |
15410 | ret = true; | |
15411 | } | |
15412 | else | |
15413 | { | |
15414 | mp_exp_t exp = mpfr_get_exp(val); | |
15415 | mp_exp_t max_exp; | |
15416 | switch (type->bits()) | |
15417 | { | |
15418 | case 32: | |
15419 | max_exp = 128; | |
15420 | break; | |
15421 | case 64: | |
15422 | max_exp = 1024; | |
15423 | break; | |
15424 | default: | |
15425 | go_unreachable(); | |
15426 | } | |
15427 | ||
15428 | ret = exp <= max_exp; | |
d0bcce51 | 15429 | |
15430 | if (ret) | |
15431 | { | |
15432 | // Round the constant to the desired type. | |
15433 | mpfr_t t; | |
15434 | mpfr_init(t); | |
15435 | switch (type->bits()) | |
15436 | { | |
15437 | case 32: | |
15438 | mpfr_set_prec(t, 24); | |
15439 | break; | |
15440 | case 64: | |
15441 | mpfr_set_prec(t, 53); | |
15442 | break; | |
15443 | default: | |
15444 | go_unreachable(); | |
15445 | } | |
15446 | mpfr_set(t, val, GMP_RNDN); | |
15447 | mpfr_set(val, t, GMP_RNDN); | |
15448 | mpfr_clear(t); | |
15449 | ||
15450 | this->set_float(type, val); | |
15451 | } | |
0c77715b | 15452 | } |
15453 | ||
15454 | mpfr_clear(val); | |
15455 | ||
15456 | if (!ret && issue_error) | |
71a45216 | 15457 | { |
15458 | error_at(location, "floating point constant overflow"); | |
15459 | this->set_invalid(); | |
15460 | } | |
0c77715b | 15461 | |
15462 | return ret; | |
15463 | } | |
15464 | ||
15465 | // Check whether the constant can be expressed in a complex type. | |
15466 | ||
15467 | bool | |
15468 | Numeric_constant::check_complex_type(Complex_type* type, bool issue_error, | |
d0bcce51 | 15469 | Location location) |
0c77715b | 15470 | { |
15471 | if (type->is_abstract()) | |
15472 | return true; | |
15473 | ||
15474 | mp_exp_t max_exp; | |
15475 | switch (type->bits()) | |
15476 | { | |
15477 | case 64: | |
15478 | max_exp = 128; | |
15479 | break; | |
15480 | case 128: | |
15481 | max_exp = 1024; | |
15482 | break; | |
15483 | default: | |
15484 | go_unreachable(); | |
15485 | } | |
15486 | ||
fcbea5e4 | 15487 | mpc_t val; |
15488 | mpc_init2(val, mpc_precision); | |
0c77715b | 15489 | switch (this->classification_) |
15490 | { | |
15491 | case NC_INT: | |
15492 | case NC_RUNE: | |
fcbea5e4 | 15493 | mpc_set_z(val, this->u_.int_val, MPC_RNDNN); |
0c77715b | 15494 | break; |
15495 | ||
15496 | case NC_FLOAT: | |
fcbea5e4 | 15497 | mpc_set_fr(val, this->u_.float_val, MPC_RNDNN); |
0c77715b | 15498 | break; |
15499 | ||
15500 | case NC_COMPLEX: | |
fcbea5e4 | 15501 | mpc_set(val, this->u_.complex_val, MPC_RNDNN); |
0c77715b | 15502 | break; |
15503 | ||
15504 | default: | |
15505 | go_unreachable(); | |
15506 | } | |
15507 | ||
d0bcce51 | 15508 | bool ret = true; |
fcbea5e4 | 15509 | if (!mpfr_nan_p(mpc_realref(val)) |
15510 | && !mpfr_inf_p(mpc_realref(val)) | |
15511 | && !mpfr_zero_p(mpc_realref(val)) | |
15512 | && mpfr_get_exp(mpc_realref(val)) > max_exp) | |
d0bcce51 | 15513 | { |
15514 | if (issue_error) | |
71a45216 | 15515 | { |
15516 | error_at(location, "complex real part overflow"); | |
15517 | this->set_invalid(); | |
15518 | } | |
d0bcce51 | 15519 | ret = false; |
15520 | } | |
0c77715b | 15521 | |
fcbea5e4 | 15522 | if (!mpfr_nan_p(mpc_imagref(val)) |
15523 | && !mpfr_inf_p(mpc_imagref(val)) | |
15524 | && !mpfr_zero_p(mpc_imagref(val)) | |
15525 | && mpfr_get_exp(mpc_imagref(val)) > max_exp) | |
d0bcce51 | 15526 | { |
15527 | if (issue_error) | |
71a45216 | 15528 | { |
15529 | error_at(location, "complex imaginary part overflow"); | |
15530 | this->set_invalid(); | |
15531 | } | |
d0bcce51 | 15532 | ret = false; |
15533 | } | |
0c77715b | 15534 | |
d0bcce51 | 15535 | if (ret) |
15536 | { | |
15537 | // Round the constant to the desired type. | |
fcbea5e4 | 15538 | mpc_t t; |
d0bcce51 | 15539 | switch (type->bits()) |
15540 | { | |
15541 | case 64: | |
fcbea5e4 | 15542 | mpc_init2(t, 24); |
d0bcce51 | 15543 | break; |
15544 | case 128: | |
fcbea5e4 | 15545 | mpc_init2(t, 53); |
d0bcce51 | 15546 | break; |
15547 | default: | |
15548 | go_unreachable(); | |
15549 | } | |
fcbea5e4 | 15550 | mpc_set(t, val, MPC_RNDNN); |
15551 | mpc_set(val, t, MPC_RNDNN); | |
15552 | mpc_clear(t); | |
d0bcce51 | 15553 | |
fcbea5e4 | 15554 | this->set_complex(type, val); |
d0bcce51 | 15555 | } |
15556 | ||
fcbea5e4 | 15557 | mpc_clear(val); |
0c77715b | 15558 | |
15559 | return ret; | |
15560 | } | |
15561 | ||
15562 | // Return an Expression for this value. | |
15563 | ||
15564 | Expression* | |
15565 | Numeric_constant::expression(Location loc) const | |
15566 | { | |
15567 | switch (this->classification_) | |
15568 | { | |
15569 | case NC_INT: | |
e67508fa | 15570 | return Expression::make_integer_z(&this->u_.int_val, this->type_, loc); |
0c77715b | 15571 | case NC_RUNE: |
15572 | return Expression::make_character(&this->u_.int_val, this->type_, loc); | |
15573 | case NC_FLOAT: | |
15574 | return Expression::make_float(&this->u_.float_val, this->type_, loc); | |
15575 | case NC_COMPLEX: | |
fcbea5e4 | 15576 | return Expression::make_complex(&this->u_.complex_val, this->type_, loc); |
71a45216 | 15577 | case NC_INVALID: |
15578 | go_assert(saw_errors()); | |
15579 | return Expression::make_error(loc); | |
0c77715b | 15580 | default: |
15581 | go_unreachable(); | |
15582 | } | |
15583 | } |