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e440a328 | 1 | // expressions.cc -- Go frontend expression handling. |
2 | ||
3 | // Copyright 2009 The Go Authors. All rights reserved. | |
4 | // Use of this source code is governed by a BSD-style | |
5 | // license that can be found in the LICENSE file. | |
6 | ||
7 | #include "go-system.h" | |
8 | ||
ffe743ca | 9 | #include <algorithm> |
10 | ||
e440a328 | 11 | #include "go-c.h" |
12 | #include "gogo.h" | |
631d5788 | 13 | #include "go-diagnostics.h" |
e440a328 | 14 | #include "types.h" |
15 | #include "export.h" | |
16 | #include "import.h" | |
17 | #include "statements.h" | |
18 | #include "lex.h" | |
a9182619 | 19 | #include "runtime.h" |
6e193e6f | 20 | #include "backend.h" |
e440a328 | 21 | #include "expressions.h" |
d751bb78 | 22 | #include "ast-dump.h" |
e440a328 | 23 | |
24 | // Class Expression. | |
25 | ||
26 | Expression::Expression(Expression_classification classification, | |
b13c66cd | 27 | Location location) |
e440a328 | 28 | : classification_(classification), location_(location) |
29 | { | |
30 | } | |
31 | ||
32 | Expression::~Expression() | |
33 | { | |
34 | } | |
35 | ||
e440a328 | 36 | // Traverse the expressions. |
37 | ||
38 | int | |
39 | Expression::traverse(Expression** pexpr, Traverse* traverse) | |
40 | { | |
41 | Expression* expr = *pexpr; | |
42 | if ((traverse->traverse_mask() & Traverse::traverse_expressions) != 0) | |
43 | { | |
44 | int t = traverse->expression(pexpr); | |
45 | if (t == TRAVERSE_EXIT) | |
46 | return TRAVERSE_EXIT; | |
47 | else if (t == TRAVERSE_SKIP_COMPONENTS) | |
48 | return TRAVERSE_CONTINUE; | |
49 | } | |
50 | return expr->do_traverse(traverse); | |
51 | } | |
52 | ||
53 | // Traverse subexpressions of this expression. | |
54 | ||
55 | int | |
56 | Expression::traverse_subexpressions(Traverse* traverse) | |
57 | { | |
58 | return this->do_traverse(traverse); | |
59 | } | |
60 | ||
61 | // Default implementation for do_traverse for child classes. | |
62 | ||
63 | int | |
64 | Expression::do_traverse(Traverse*) | |
65 | { | |
66 | return TRAVERSE_CONTINUE; | |
67 | } | |
68 | ||
69 | // This virtual function is called by the parser if the value of this | |
a7549a6a | 70 | // expression is being discarded. By default, we give an error. |
71 | // Expressions with side effects override. | |
e440a328 | 72 | |
4f2138d7 | 73 | bool |
e440a328 | 74 | Expression::do_discarding_value() |
75 | { | |
a7549a6a | 76 | this->unused_value_error(); |
4f2138d7 | 77 | return false; |
e440a328 | 78 | } |
79 | ||
80 | // This virtual function is called to export expressions. This will | |
81 | // only be used by expressions which may be constant. | |
82 | ||
83 | void | |
84 | Expression::do_export(Export*) const | |
85 | { | |
c3e6f413 | 86 | go_unreachable(); |
e440a328 | 87 | } |
88 | ||
a7549a6a | 89 | // Give an error saying that the value of the expression is not used. |
e440a328 | 90 | |
91 | void | |
a7549a6a | 92 | Expression::unused_value_error() |
e440a328 | 93 | { |
4f2138d7 | 94 | this->report_error(_("value computed is not used")); |
e440a328 | 95 | } |
96 | ||
97 | // Note that this expression is an error. This is called by children | |
98 | // when they discover an error. | |
99 | ||
100 | void | |
101 | Expression::set_is_error() | |
102 | { | |
103 | this->classification_ = EXPRESSION_ERROR; | |
104 | } | |
105 | ||
106 | // For children to call to report an error conveniently. | |
107 | ||
108 | void | |
109 | Expression::report_error(const char* msg) | |
110 | { | |
631d5788 | 111 | go_error_at(this->location_, "%s", msg); |
e440a328 | 112 | this->set_is_error(); |
113 | } | |
114 | ||
115 | // Set types of variables and constants. This is implemented by the | |
116 | // child class. | |
117 | ||
118 | void | |
119 | Expression::determine_type(const Type_context* context) | |
120 | { | |
121 | this->do_determine_type(context); | |
122 | } | |
123 | ||
124 | // Set types when there is no context. | |
125 | ||
126 | void | |
127 | Expression::determine_type_no_context() | |
128 | { | |
129 | Type_context context; | |
130 | this->do_determine_type(&context); | |
131 | } | |
132 | ||
2c809f8f | 133 | // Return an expression handling any conversions which must be done during |
e440a328 | 134 | // assignment. |
135 | ||
2c809f8f | 136 | Expression* |
b4a33049 | 137 | Expression::convert_for_assignment(Gogo*, Type* lhs_type, |
2c809f8f | 138 | Expression* rhs, Location location) |
e440a328 | 139 | { |
2c809f8f | 140 | Type* rhs_type = rhs->type(); |
141 | if (lhs_type->is_error() | |
142 | || rhs_type->is_error() | |
143 | || rhs->is_error_expression()) | |
144 | return Expression::make_error(location); | |
e440a328 | 145 | |
54211955 | 146 | if (lhs_type->forwarded() != rhs_type->forwarded() |
147 | && lhs_type->interface_type() != NULL) | |
e440a328 | 148 | { |
149 | if (rhs_type->interface_type() == NULL) | |
2c809f8f | 150 | return Expression::convert_type_to_interface(lhs_type, rhs, location); |
e440a328 | 151 | else |
2c809f8f | 152 | return Expression::convert_interface_to_interface(lhs_type, rhs, false, |
153 | location); | |
e440a328 | 154 | } |
54211955 | 155 | else if (lhs_type->forwarded() != rhs_type->forwarded() |
156 | && rhs_type->interface_type() != NULL) | |
2c809f8f | 157 | return Expression::convert_interface_to_type(lhs_type, rhs, location); |
411eb89e | 158 | else if (lhs_type->is_slice_type() && rhs_type->is_nil_type()) |
e440a328 | 159 | { |
2c809f8f | 160 | // Assigning nil to a slice. |
2c809f8f | 161 | Expression* nil = Expression::make_nil(location); |
e67508fa | 162 | Expression* zero = Expression::make_integer_ul(0, NULL, location); |
2c809f8f | 163 | return Expression::make_slice_value(lhs_type, nil, zero, zero, location); |
e440a328 | 164 | } |
165 | else if (rhs_type->is_nil_type()) | |
2c809f8f | 166 | return Expression::make_nil(location); |
167 | else if (Type::are_identical(lhs_type, rhs_type, false, NULL)) | |
e440a328 | 168 | { |
169 | // No conversion is needed. | |
2c809f8f | 170 | return rhs; |
171 | } | |
172 | else if (lhs_type->points_to() != NULL) | |
173 | return Expression::make_unsafe_cast(lhs_type, rhs, location); | |
174 | else if (lhs_type->is_numeric_type()) | |
175 | return Expression::make_cast(lhs_type, rhs, location); | |
176 | else if ((lhs_type->struct_type() != NULL | |
177 | && rhs_type->struct_type() != NULL) | |
178 | || (lhs_type->array_type() != NULL | |
179 | && rhs_type->array_type() != NULL)) | |
e440a328 | 180 | { |
181 | // This conversion must be permitted by Go, or we wouldn't have | |
182 | // gotten here. | |
2c809f8f | 183 | return Expression::make_unsafe_cast(lhs_type, rhs, location); |
e440a328 | 184 | } |
185 | else | |
2c809f8f | 186 | return rhs; |
e440a328 | 187 | } |
188 | ||
2c809f8f | 189 | // Return an expression for a conversion from a non-interface type to an |
e440a328 | 190 | // interface type. |
191 | ||
2c809f8f | 192 | Expression* |
193 | Expression::convert_type_to_interface(Type* lhs_type, Expression* rhs, | |
194 | Location location) | |
e440a328 | 195 | { |
e440a328 | 196 | Interface_type* lhs_interface_type = lhs_type->interface_type(); |
197 | bool lhs_is_empty = lhs_interface_type->is_empty(); | |
198 | ||
199 | // Since RHS_TYPE is a static type, we can create the interface | |
200 | // method table at compile time. | |
201 | ||
202 | // When setting an interface to nil, we just set both fields to | |
203 | // NULL. | |
2c809f8f | 204 | Type* rhs_type = rhs->type(); |
e440a328 | 205 | if (rhs_type->is_nil_type()) |
63697958 | 206 | { |
2c809f8f | 207 | Expression* nil = Expression::make_nil(location); |
208 | return Expression::make_interface_value(lhs_type, nil, nil, location); | |
63697958 | 209 | } |
e440a328 | 210 | |
211 | // This should have been checked already. | |
c484d925 | 212 | go_assert(lhs_interface_type->implements_interface(rhs_type, NULL)); |
e440a328 | 213 | |
e440a328 | 214 | // An interface is a tuple. If LHS_TYPE is an empty interface type, |
215 | // then the first field is the type descriptor for RHS_TYPE. | |
216 | // Otherwise it is the interface method table for RHS_TYPE. | |
2c809f8f | 217 | Expression* first_field; |
e440a328 | 218 | if (lhs_is_empty) |
2c809f8f | 219 | first_field = Expression::make_type_descriptor(rhs_type, location); |
e440a328 | 220 | else |
221 | { | |
222 | // Build the interface method table for this interface and this | |
223 | // object type: a list of function pointers for each interface | |
224 | // method. | |
225 | Named_type* rhs_named_type = rhs_type->named_type(); | |
c0cab2ec | 226 | Struct_type* rhs_struct_type = rhs_type->struct_type(); |
e440a328 | 227 | bool is_pointer = false; |
c0cab2ec | 228 | if (rhs_named_type == NULL && rhs_struct_type == NULL) |
e440a328 | 229 | { |
230 | rhs_named_type = rhs_type->deref()->named_type(); | |
c0cab2ec | 231 | rhs_struct_type = rhs_type->deref()->struct_type(); |
e440a328 | 232 | is_pointer = true; |
233 | } | |
c0cab2ec | 234 | if (rhs_named_type != NULL) |
2c809f8f | 235 | first_field = |
236 | rhs_named_type->interface_method_table(lhs_interface_type, | |
237 | is_pointer); | |
c0cab2ec | 238 | else if (rhs_struct_type != NULL) |
2c809f8f | 239 | first_field = |
240 | rhs_struct_type->interface_method_table(lhs_interface_type, | |
241 | is_pointer); | |
c0cab2ec | 242 | else |
2c809f8f | 243 | first_field = Expression::make_nil(location); |
e440a328 | 244 | } |
e440a328 | 245 | |
2c809f8f | 246 | Expression* obj; |
e440a328 | 247 | if (rhs_type->points_to() != NULL) |
248 | { | |
2c809f8f | 249 | // We are assigning a pointer to the interface; the interface |
e440a328 | 250 | // holds the pointer itself. |
2c809f8f | 251 | obj = rhs; |
252 | } | |
253 | else | |
254 | { | |
255 | // We are assigning a non-pointer value to the interface; the | |
45ff893b | 256 | // interface gets a copy of the value in the heap if it escapes. |
257 | // TODO(cmang): Associate escape state state of RHS with newly | |
258 | // created OBJ. | |
2c809f8f | 259 | obj = Expression::make_heap_expression(rhs, location); |
e440a328 | 260 | } |
261 | ||
2c809f8f | 262 | return Expression::make_interface_value(lhs_type, first_field, obj, location); |
263 | } | |
e440a328 | 264 | |
2c809f8f | 265 | // Return an expression for the type descriptor of RHS. |
e440a328 | 266 | |
2c809f8f | 267 | Expression* |
268 | Expression::get_interface_type_descriptor(Expression* rhs) | |
269 | { | |
270 | go_assert(rhs->type()->interface_type() != NULL); | |
271 | Location location = rhs->location(); | |
e440a328 | 272 | |
2c809f8f | 273 | // The type descriptor is the first field of an empty interface. |
274 | if (rhs->type()->interface_type()->is_empty()) | |
275 | return Expression::make_interface_info(rhs, INTERFACE_INFO_TYPE_DESCRIPTOR, | |
276 | location); | |
277 | ||
278 | Expression* mtable = | |
279 | Expression::make_interface_info(rhs, INTERFACE_INFO_METHODS, location); | |
e440a328 | 280 | |
2c809f8f | 281 | Expression* descriptor = |
282 | Expression::make_unary(OPERATOR_MULT, mtable, location); | |
283 | descriptor = Expression::make_field_reference(descriptor, 0, location); | |
284 | Expression* nil = Expression::make_nil(location); | |
e440a328 | 285 | |
2c809f8f | 286 | Expression* eq = |
287 | Expression::make_binary(OPERATOR_EQEQ, mtable, nil, location); | |
288 | return Expression::make_conditional(eq, nil, descriptor, location); | |
e440a328 | 289 | } |
290 | ||
2c809f8f | 291 | // Return an expression for the conversion of an interface type to an |
e440a328 | 292 | // interface type. |
293 | ||
2c809f8f | 294 | Expression* |
295 | Expression::convert_interface_to_interface(Type *lhs_type, Expression* rhs, | |
296 | bool for_type_guard, | |
297 | Location location) | |
e440a328 | 298 | { |
8ba8cc87 | 299 | if (Type::are_identical(lhs_type, rhs->type(), false, NULL)) |
300 | return rhs; | |
301 | ||
e440a328 | 302 | Interface_type* lhs_interface_type = lhs_type->interface_type(); |
303 | bool lhs_is_empty = lhs_interface_type->is_empty(); | |
304 | ||
e440a328 | 305 | // In the general case this requires runtime examination of the type |
306 | // method table to match it up with the interface methods. | |
307 | ||
308 | // FIXME: If all of the methods in the right hand side interface | |
309 | // also appear in the left hand side interface, then we don't need | |
310 | // to do a runtime check, although we still need to build a new | |
311 | // method table. | |
312 | ||
8ba8cc87 | 313 | // We are going to evaluate RHS multiple times. |
314 | go_assert(rhs->is_variable()); | |
315 | ||
e440a328 | 316 | // Get the type descriptor for the right hand side. This will be |
317 | // NULL for a nil interface. | |
2c809f8f | 318 | Expression* rhs_type_expr = Expression::get_interface_type_descriptor(rhs); |
319 | Expression* lhs_type_expr = | |
320 | Expression::make_type_descriptor(lhs_type, location); | |
e440a328 | 321 | |
2c809f8f | 322 | Expression* first_field; |
e440a328 | 323 | if (for_type_guard) |
324 | { | |
325 | // A type assertion fails when converting a nil interface. | |
6098d6cb | 326 | first_field = Runtime::make_call(Runtime::ASSERTITAB, location, 2, |
327 | lhs_type_expr, rhs_type_expr); | |
e440a328 | 328 | } |
329 | else if (lhs_is_empty) | |
330 | { | |
2c809f8f | 331 | // A conversion to an empty interface always succeeds, and the |
e440a328 | 332 | // first field is just the type descriptor of the object. |
2c809f8f | 333 | first_field = rhs_type_expr; |
e440a328 | 334 | } |
335 | else | |
336 | { | |
337 | // A conversion to a non-empty interface may fail, but unlike a | |
338 | // type assertion converting nil will always succeed. | |
6098d6cb | 339 | first_field = Runtime::make_call(Runtime::REQUIREITAB, location, 2, |
340 | lhs_type_expr, rhs_type_expr); | |
e440a328 | 341 | } |
342 | ||
343 | // The second field is simply the object pointer. | |
2c809f8f | 344 | Expression* obj = |
345 | Expression::make_interface_info(rhs, INTERFACE_INFO_OBJECT, location); | |
346 | return Expression::make_interface_value(lhs_type, first_field, obj, location); | |
e440a328 | 347 | } |
348 | ||
2c809f8f | 349 | // Return an expression for the conversion of an interface type to a |
e440a328 | 350 | // non-interface type. |
351 | ||
2c809f8f | 352 | Expression* |
353 | Expression::convert_interface_to_type(Type *lhs_type, Expression* rhs, | |
354 | Location location) | |
e440a328 | 355 | { |
8ba8cc87 | 356 | // We are going to evaluate RHS multiple times. |
357 | go_assert(rhs->is_variable()); | |
358 | ||
e440a328 | 359 | // Call a function to check that the type is valid. The function |
360 | // will panic with an appropriate runtime type error if the type is | |
361 | // not valid. | |
2c809f8f | 362 | Expression* lhs_type_expr = Expression::make_type_descriptor(lhs_type, |
363 | location); | |
364 | Expression* rhs_descriptor = | |
365 | Expression::get_interface_type_descriptor(rhs); | |
366 | ||
367 | Type* rhs_type = rhs->type(); | |
368 | Expression* rhs_inter_expr = Expression::make_type_descriptor(rhs_type, | |
369 | location); | |
370 | ||
6098d6cb | 371 | Expression* check_iface = Runtime::make_call(Runtime::ASSERTI2T, |
2c809f8f | 372 | location, 3, lhs_type_expr, |
373 | rhs_descriptor, rhs_inter_expr); | |
e440a328 | 374 | |
375 | // If the call succeeds, pull out the value. | |
2c809f8f | 376 | Expression* obj = Expression::make_interface_info(rhs, INTERFACE_INFO_OBJECT, |
377 | location); | |
e440a328 | 378 | |
379 | // If the value is a pointer, then it is the value we want. | |
380 | // Otherwise it points to the value. | |
381 | if (lhs_type->points_to() == NULL) | |
382 | { | |
2c809f8f | 383 | obj = Expression::make_unsafe_cast(Type::make_pointer_type(lhs_type), obj, |
384 | location); | |
385 | obj = Expression::make_unary(OPERATOR_MULT, obj, location); | |
e440a328 | 386 | } |
2c809f8f | 387 | return Expression::make_compound(check_iface, obj, location); |
e440a328 | 388 | } |
389 | ||
ea664253 | 390 | // Convert an expression to its backend representation. This is implemented by |
391 | // the child class. Not that it is not in general safe to call this multiple | |
e440a328 | 392 | // times for a single expression, but that we don't catch such errors. |
393 | ||
ea664253 | 394 | Bexpression* |
395 | Expression::get_backend(Translate_context* context) | |
e440a328 | 396 | { |
397 | // The child may have marked this expression as having an error. | |
398 | if (this->classification_ == EXPRESSION_ERROR) | |
ea664253 | 399 | return context->backend()->error_expression(); |
e440a328 | 400 | |
ea664253 | 401 | return this->do_get_backend(context); |
e440a328 | 402 | } |
403 | ||
48c2a53a | 404 | // Return a backend expression for VAL. |
405 | Bexpression* | |
406 | Expression::backend_numeric_constant_expression(Translate_context* context, | |
407 | Numeric_constant* val) | |
e440a328 | 408 | { |
48c2a53a | 409 | Gogo* gogo = context->gogo(); |
410 | Type* type = val->type(); | |
411 | if (type == NULL) | |
412 | return gogo->backend()->error_expression(); | |
e440a328 | 413 | |
48c2a53a | 414 | Btype* btype = type->get_backend(gogo); |
415 | Bexpression* ret; | |
416 | if (type->integer_type() != NULL) | |
e440a328 | 417 | { |
418 | mpz_t ival; | |
48c2a53a | 419 | if (!val->to_int(&ival)) |
420 | { | |
421 | go_assert(saw_errors()); | |
422 | return gogo->backend()->error_expression(); | |
423 | } | |
424 | ret = gogo->backend()->integer_constant_expression(btype, ival); | |
e440a328 | 425 | mpz_clear(ival); |
e440a328 | 426 | } |
48c2a53a | 427 | else if (type->float_type() != NULL) |
e440a328 | 428 | { |
48c2a53a | 429 | mpfr_t fval; |
430 | if (!val->to_float(&fval)) | |
431 | { | |
432 | go_assert(saw_errors()); | |
433 | return gogo->backend()->error_expression(); | |
434 | } | |
435 | ret = gogo->backend()->float_constant_expression(btype, fval); | |
436 | mpfr_clear(fval); | |
e440a328 | 437 | } |
48c2a53a | 438 | else if (type->complex_type() != NULL) |
e440a328 | 439 | { |
fcbea5e4 | 440 | mpc_t cval; |
441 | if (!val->to_complex(&cval)) | |
48c2a53a | 442 | { |
443 | go_assert(saw_errors()); | |
444 | return gogo->backend()->error_expression(); | |
445 | } | |
fcbea5e4 | 446 | ret = gogo->backend()->complex_constant_expression(btype, cval); |
447 | mpc_clear(cval); | |
e440a328 | 448 | } |
449 | else | |
c3e6f413 | 450 | go_unreachable(); |
e440a328 | 451 | |
48c2a53a | 452 | return ret; |
e440a328 | 453 | } |
454 | ||
2c809f8f | 455 | // Return an expression which evaluates to true if VAL, of arbitrary integer |
456 | // type, is negative or is more than the maximum value of the Go type "int". | |
e440a328 | 457 | |
2c809f8f | 458 | Expression* |
459 | Expression::check_bounds(Expression* val, Location loc) | |
e440a328 | 460 | { |
2c809f8f | 461 | Type* val_type = val->type(); |
462 | Type* bound_type = Type::lookup_integer_type("int"); | |
463 | ||
464 | int val_type_size; | |
465 | bool val_is_unsigned = false; | |
466 | if (val_type->integer_type() != NULL) | |
467 | { | |
468 | val_type_size = val_type->integer_type()->bits(); | |
469 | val_is_unsigned = val_type->integer_type()->is_unsigned(); | |
470 | } | |
471 | else | |
472 | { | |
473 | if (!val_type->is_numeric_type() | |
474 | || !Type::are_convertible(bound_type, val_type, NULL)) | |
475 | { | |
476 | go_assert(saw_errors()); | |
477 | return Expression::make_boolean(true, loc); | |
478 | } | |
e440a328 | 479 | |
2c809f8f | 480 | if (val_type->complex_type() != NULL) |
481 | val_type_size = val_type->complex_type()->bits(); | |
482 | else | |
483 | val_type_size = val_type->float_type()->bits(); | |
484 | } | |
485 | ||
486 | Expression* negative_index = Expression::make_boolean(false, loc); | |
487 | Expression* index_overflows = Expression::make_boolean(false, loc); | |
488 | if (!val_is_unsigned) | |
e440a328 | 489 | { |
e67508fa | 490 | Expression* zero = Expression::make_integer_ul(0, val_type, loc); |
2c809f8f | 491 | negative_index = Expression::make_binary(OPERATOR_LT, val, zero, loc); |
e440a328 | 492 | } |
493 | ||
2c809f8f | 494 | int bound_type_size = bound_type->integer_type()->bits(); |
c3068ac0 | 495 | if (val_type_size > bound_type_size |
496 | || (val_type_size == bound_type_size | |
2c809f8f | 497 | && val_is_unsigned)) |
498 | { | |
499 | mpz_t one; | |
500 | mpz_init_set_ui(one, 1UL); | |
501 | ||
502 | // maxval = 2^(bound_type_size - 1) - 1 | |
503 | mpz_t maxval; | |
504 | mpz_init(maxval); | |
505 | mpz_mul_2exp(maxval, one, bound_type_size - 1); | |
506 | mpz_sub_ui(maxval, maxval, 1); | |
e67508fa | 507 | Expression* max = Expression::make_integer_z(&maxval, val_type, loc); |
2c809f8f | 508 | mpz_clear(one); |
509 | mpz_clear(maxval); | |
510 | ||
511 | index_overflows = Expression::make_binary(OPERATOR_GT, val, max, loc); | |
e440a328 | 512 | } |
513 | ||
2c809f8f | 514 | return Expression::make_binary(OPERATOR_OROR, negative_index, index_overflows, |
515 | loc); | |
e440a328 | 516 | } |
517 | ||
d751bb78 | 518 | void |
519 | Expression::dump_expression(Ast_dump_context* ast_dump_context) const | |
520 | { | |
521 | this->do_dump_expression(ast_dump_context); | |
522 | } | |
523 | ||
e440a328 | 524 | // Error expressions. This are used to avoid cascading errors. |
525 | ||
526 | class Error_expression : public Expression | |
527 | { | |
528 | public: | |
b13c66cd | 529 | Error_expression(Location location) |
e440a328 | 530 | : Expression(EXPRESSION_ERROR, location) |
531 | { } | |
532 | ||
533 | protected: | |
534 | bool | |
535 | do_is_constant() const | |
536 | { return true; } | |
537 | ||
538 | bool | |
0c77715b | 539 | do_numeric_constant_value(Numeric_constant* nc) const |
e440a328 | 540 | { |
0c77715b | 541 | nc->set_unsigned_long(NULL, 0); |
e440a328 | 542 | return true; |
543 | } | |
544 | ||
4f2138d7 | 545 | bool |
e440a328 | 546 | do_discarding_value() |
4f2138d7 | 547 | { return true; } |
e440a328 | 548 | |
549 | Type* | |
550 | do_type() | |
551 | { return Type::make_error_type(); } | |
552 | ||
553 | void | |
554 | do_determine_type(const Type_context*) | |
555 | { } | |
556 | ||
557 | Expression* | |
558 | do_copy() | |
559 | { return this; } | |
560 | ||
561 | bool | |
562 | do_is_addressable() const | |
563 | { return true; } | |
564 | ||
ea664253 | 565 | Bexpression* |
566 | do_get_backend(Translate_context* context) | |
567 | { return context->backend()->error_expression(); } | |
d751bb78 | 568 | |
569 | void | |
570 | do_dump_expression(Ast_dump_context*) const; | |
e440a328 | 571 | }; |
572 | ||
d751bb78 | 573 | // Dump the ast representation for an error expression to a dump context. |
574 | ||
575 | void | |
576 | Error_expression::do_dump_expression(Ast_dump_context* ast_dump_context) const | |
577 | { | |
578 | ast_dump_context->ostream() << "_Error_" ; | |
579 | } | |
580 | ||
e440a328 | 581 | Expression* |
b13c66cd | 582 | Expression::make_error(Location location) |
e440a328 | 583 | { |
584 | return new Error_expression(location); | |
585 | } | |
586 | ||
587 | // An expression which is really a type. This is used during parsing. | |
588 | // It is an error if these survive after lowering. | |
589 | ||
590 | class | |
591 | Type_expression : public Expression | |
592 | { | |
593 | public: | |
b13c66cd | 594 | Type_expression(Type* type, Location location) |
e440a328 | 595 | : Expression(EXPRESSION_TYPE, location), |
596 | type_(type) | |
597 | { } | |
598 | ||
599 | protected: | |
600 | int | |
601 | do_traverse(Traverse* traverse) | |
602 | { return Type::traverse(this->type_, traverse); } | |
603 | ||
604 | Type* | |
605 | do_type() | |
606 | { return this->type_; } | |
607 | ||
608 | void | |
609 | do_determine_type(const Type_context*) | |
610 | { } | |
611 | ||
612 | void | |
613 | do_check_types(Gogo*) | |
614 | { this->report_error(_("invalid use of type")); } | |
615 | ||
616 | Expression* | |
617 | do_copy() | |
618 | { return this; } | |
619 | ||
ea664253 | 620 | Bexpression* |
621 | do_get_backend(Translate_context*) | |
c3e6f413 | 622 | { go_unreachable(); } |
e440a328 | 623 | |
d751bb78 | 624 | void do_dump_expression(Ast_dump_context*) const; |
625 | ||
e440a328 | 626 | private: |
627 | // The type which we are representing as an expression. | |
628 | Type* type_; | |
629 | }; | |
630 | ||
d751bb78 | 631 | void |
632 | Type_expression::do_dump_expression(Ast_dump_context* ast_dump_context) const | |
633 | { | |
634 | ast_dump_context->dump_type(this->type_); | |
635 | } | |
636 | ||
e440a328 | 637 | Expression* |
b13c66cd | 638 | Expression::make_type(Type* type, Location location) |
e440a328 | 639 | { |
640 | return new Type_expression(type, location); | |
641 | } | |
642 | ||
e03bdf36 | 643 | // Class Parser_expression. |
644 | ||
645 | Type* | |
646 | Parser_expression::do_type() | |
647 | { | |
648 | // We should never really ask for the type of a Parser_expression. | |
649 | // However, it can happen, at least when we have an invalid const | |
650 | // whose initializer refers to the const itself. In that case we | |
651 | // may ask for the type when lowering the const itself. | |
c484d925 | 652 | go_assert(saw_errors()); |
e03bdf36 | 653 | return Type::make_error_type(); |
654 | } | |
655 | ||
e440a328 | 656 | // Class Var_expression. |
657 | ||
658 | // Lower a variable expression. Here we just make sure that the | |
659 | // initialization expression of the variable has been lowered. This | |
660 | // ensures that we will be able to determine the type of the variable | |
661 | // if necessary. | |
662 | ||
663 | Expression* | |
ceeb4318 | 664 | Var_expression::do_lower(Gogo* gogo, Named_object* function, |
665 | Statement_inserter* inserter, int) | |
e440a328 | 666 | { |
667 | if (this->variable_->is_variable()) | |
668 | { | |
669 | Variable* var = this->variable_->var_value(); | |
670 | // This is either a local variable or a global variable. A | |
671 | // reference to a variable which is local to an enclosing | |
672 | // function will be a reference to a field in a closure. | |
673 | if (var->is_global()) | |
ceeb4318 | 674 | { |
675 | function = NULL; | |
676 | inserter = NULL; | |
677 | } | |
678 | var->lower_init_expression(gogo, function, inserter); | |
e440a328 | 679 | } |
680 | return this; | |
681 | } | |
682 | ||
e440a328 | 683 | // Return the type of a reference to a variable. |
684 | ||
685 | Type* | |
686 | Var_expression::do_type() | |
687 | { | |
688 | if (this->variable_->is_variable()) | |
689 | return this->variable_->var_value()->type(); | |
690 | else if (this->variable_->is_result_variable()) | |
691 | return this->variable_->result_var_value()->type(); | |
692 | else | |
c3e6f413 | 693 | go_unreachable(); |
e440a328 | 694 | } |
695 | ||
0ab09e06 | 696 | // Determine the type of a reference to a variable. |
697 | ||
698 | void | |
699 | Var_expression::do_determine_type(const Type_context*) | |
700 | { | |
701 | if (this->variable_->is_variable()) | |
702 | this->variable_->var_value()->determine_type(); | |
703 | } | |
704 | ||
e440a328 | 705 | // Something takes the address of this variable. This means that we |
706 | // may want to move the variable onto the heap. | |
707 | ||
708 | void | |
709 | Var_expression::do_address_taken(bool escapes) | |
710 | { | |
711 | if (!escapes) | |
f325319b | 712 | { |
713 | if (this->variable_->is_variable()) | |
714 | this->variable_->var_value()->set_non_escaping_address_taken(); | |
715 | else if (this->variable_->is_result_variable()) | |
716 | this->variable_->result_var_value()->set_non_escaping_address_taken(); | |
717 | else | |
718 | go_unreachable(); | |
719 | } | |
e440a328 | 720 | else |
f325319b | 721 | { |
722 | if (this->variable_->is_variable()) | |
723 | this->variable_->var_value()->set_address_taken(); | |
724 | else if (this->variable_->is_result_variable()) | |
725 | this->variable_->result_var_value()->set_address_taken(); | |
726 | else | |
727 | go_unreachable(); | |
728 | } | |
45ff893b | 729 | |
730 | if (this->variable_->is_variable() | |
731 | && this->variable_->var_value()->is_in_heap()) | |
732 | { | |
733 | Node::make_node(this)->set_encoding(Node::ESCAPE_HEAP); | |
734 | Node::make_node(this->variable_)->set_encoding(Node::ESCAPE_HEAP); | |
735 | } | |
e440a328 | 736 | } |
737 | ||
ea664253 | 738 | // Get the backend representation for a reference to a variable. |
e440a328 | 739 | |
ea664253 | 740 | Bexpression* |
741 | Var_expression::do_get_backend(Translate_context* context) | |
e440a328 | 742 | { |
fe2f84cf | 743 | Bvariable* bvar = this->variable_->get_backend_variable(context->gogo(), |
744 | context->function()); | |
fe2f84cf | 745 | bool is_in_heap; |
c6777780 | 746 | Location loc = this->location(); |
9b27b43c | 747 | Btype* btype; |
748 | Gogo* gogo = context->gogo(); | |
fe2f84cf | 749 | if (this->variable_->is_variable()) |
9b27b43c | 750 | { |
751 | is_in_heap = this->variable_->var_value()->is_in_heap(); | |
752 | btype = this->variable_->var_value()->type()->get_backend(gogo); | |
753 | } | |
fe2f84cf | 754 | else if (this->variable_->is_result_variable()) |
9b27b43c | 755 | { |
756 | is_in_heap = this->variable_->result_var_value()->is_in_heap(); | |
757 | btype = this->variable_->result_var_value()->type()->get_backend(gogo); | |
758 | } | |
fe2f84cf | 759 | else |
c3e6f413 | 760 | go_unreachable(); |
c6777780 | 761 | |
762 | Bexpression* ret = context->backend()->var_expression(bvar, loc); | |
fe2f84cf | 763 | if (is_in_heap) |
9b27b43c | 764 | ret = context->backend()->indirect_expression(btype, ret, true, loc); |
ea664253 | 765 | return ret; |
e440a328 | 766 | } |
767 | ||
d751bb78 | 768 | // Ast dump for variable expression. |
769 | ||
770 | void | |
771 | Var_expression::do_dump_expression(Ast_dump_context* ast_dump_context) const | |
772 | { | |
773 | ast_dump_context->ostream() << this->variable_->name() ; | |
774 | } | |
775 | ||
e440a328 | 776 | // Make a reference to a variable in an expression. |
777 | ||
778 | Expression* | |
b13c66cd | 779 | Expression::make_var_reference(Named_object* var, Location location) |
e440a328 | 780 | { |
781 | if (var->is_sink()) | |
782 | return Expression::make_sink(location); | |
783 | ||
784 | // FIXME: Creating a new object for each reference to a variable is | |
785 | // wasteful. | |
786 | return new Var_expression(var, location); | |
787 | } | |
788 | ||
b0c09712 | 789 | // Class Enclosed_var_expression. |
790 | ||
791 | int | |
792 | Enclosed_var_expression::do_traverse(Traverse*) | |
793 | { | |
794 | return TRAVERSE_CONTINUE; | |
795 | } | |
796 | ||
797 | // Lower the reference to the enclosed variable. | |
798 | ||
799 | Expression* | |
800 | Enclosed_var_expression::do_lower(Gogo* gogo, Named_object* function, | |
801 | Statement_inserter* inserter, int) | |
802 | { | |
803 | gogo->lower_expression(function, inserter, &this->reference_); | |
804 | return this; | |
805 | } | |
806 | ||
807 | // Flatten the reference to the enclosed variable. | |
808 | ||
809 | Expression* | |
810 | Enclosed_var_expression::do_flatten(Gogo* gogo, Named_object* function, | |
811 | Statement_inserter* inserter) | |
812 | { | |
813 | gogo->flatten_expression(function, inserter, &this->reference_); | |
814 | return this; | |
815 | } | |
816 | ||
817 | void | |
818 | Enclosed_var_expression::do_address_taken(bool escapes) | |
819 | { | |
820 | if (!escapes) | |
821 | { | |
822 | if (this->variable_->is_variable()) | |
823 | this->variable_->var_value()->set_non_escaping_address_taken(); | |
824 | else if (this->variable_->is_result_variable()) | |
825 | this->variable_->result_var_value()->set_non_escaping_address_taken(); | |
826 | else | |
827 | go_unreachable(); | |
828 | } | |
829 | else | |
830 | { | |
831 | if (this->variable_->is_variable()) | |
832 | this->variable_->var_value()->set_address_taken(); | |
833 | else if (this->variable_->is_result_variable()) | |
834 | this->variable_->result_var_value()->set_address_taken(); | |
835 | else | |
836 | go_unreachable(); | |
837 | } | |
45ff893b | 838 | |
839 | if (this->variable_->is_variable() | |
840 | && this->variable_->var_value()->is_in_heap()) | |
841 | Node::make_node(this->variable_)->set_encoding(Node::ESCAPE_HEAP); | |
b0c09712 | 842 | } |
843 | ||
844 | // Ast dump for enclosed variable expression. | |
845 | ||
846 | void | |
847 | Enclosed_var_expression::do_dump_expression(Ast_dump_context* adc) const | |
848 | { | |
849 | adc->ostream() << this->variable_->name(); | |
850 | } | |
851 | ||
852 | // Make a reference to a variable within an enclosing function. | |
853 | ||
854 | Expression* | |
855 | Expression::make_enclosing_var_reference(Expression* reference, | |
856 | Named_object* var, Location location) | |
857 | { | |
858 | return new Enclosed_var_expression(reference, var, location); | |
859 | } | |
860 | ||
e440a328 | 861 | // Class Temporary_reference_expression. |
862 | ||
863 | // The type. | |
864 | ||
865 | Type* | |
866 | Temporary_reference_expression::do_type() | |
867 | { | |
868 | return this->statement_->type(); | |
869 | } | |
870 | ||
871 | // Called if something takes the address of this temporary variable. | |
872 | // We never have to move temporary variables to the heap, but we do | |
873 | // need to know that they must live in the stack rather than in a | |
874 | // register. | |
875 | ||
876 | void | |
877 | Temporary_reference_expression::do_address_taken(bool) | |
878 | { | |
879 | this->statement_->set_is_address_taken(); | |
880 | } | |
881 | ||
ea664253 | 882 | // Get a backend expression referring to the variable. |
e440a328 | 883 | |
ea664253 | 884 | Bexpression* |
885 | Temporary_reference_expression::do_get_backend(Translate_context* context) | |
e440a328 | 886 | { |
cd440cff | 887 | Gogo* gogo = context->gogo(); |
eefc1ed3 | 888 | Bvariable* bvar = this->statement_->get_backend_variable(context); |
cd440cff | 889 | Bexpression* ret = gogo->backend()->var_expression(bvar, this->location()); |
eefc1ed3 | 890 | |
cd440cff | 891 | // The backend can't always represent the same set of recursive types |
eefc1ed3 | 892 | // that the Go frontend can. In some cases this means that a |
893 | // temporary variable won't have the right backend type. Correct | |
894 | // that here by adding a type cast. We need to use base() to push | |
895 | // the circularity down one level. | |
cd440cff | 896 | Type* stype = this->statement_->type(); |
ceeb4318 | 897 | if (!this->is_lvalue_ |
cd440cff | 898 | && stype->has_pointer() |
899 | && stype->deref()->is_void_type()) | |
eefc1ed3 | 900 | { |
cd440cff | 901 | Btype* btype = this->type()->base()->get_backend(gogo); |
902 | ret = gogo->backend()->convert_expression(btype, ret, this->location()); | |
eefc1ed3 | 903 | } |
ea664253 | 904 | return ret; |
e440a328 | 905 | } |
906 | ||
d751bb78 | 907 | // Ast dump for temporary reference. |
908 | ||
909 | void | |
910 | Temporary_reference_expression::do_dump_expression( | |
911 | Ast_dump_context* ast_dump_context) const | |
912 | { | |
913 | ast_dump_context->dump_temp_variable_name(this->statement_); | |
914 | } | |
915 | ||
e440a328 | 916 | // Make a reference to a temporary variable. |
917 | ||
ceeb4318 | 918 | Temporary_reference_expression* |
e440a328 | 919 | Expression::make_temporary_reference(Temporary_statement* statement, |
b13c66cd | 920 | Location location) |
e440a328 | 921 | { |
922 | return new Temporary_reference_expression(statement, location); | |
923 | } | |
924 | ||
e9d3367e | 925 | // Class Set_and_use_temporary_expression. |
926 | ||
927 | // Return the type. | |
928 | ||
929 | Type* | |
930 | Set_and_use_temporary_expression::do_type() | |
931 | { | |
932 | return this->statement_->type(); | |
933 | } | |
934 | ||
0afbb937 | 935 | // Determine the type of the expression. |
936 | ||
937 | void | |
938 | Set_and_use_temporary_expression::do_determine_type( | |
939 | const Type_context* context) | |
940 | { | |
941 | this->expr_->determine_type(context); | |
942 | } | |
943 | ||
e9d3367e | 944 | // Take the address. |
945 | ||
946 | void | |
947 | Set_and_use_temporary_expression::do_address_taken(bool) | |
948 | { | |
949 | this->statement_->set_is_address_taken(); | |
950 | } | |
951 | ||
952 | // Return the backend representation. | |
953 | ||
ea664253 | 954 | Bexpression* |
955 | Set_and_use_temporary_expression::do_get_backend(Translate_context* context) | |
e9d3367e | 956 | { |
e9d3367e | 957 | Location loc = this->location(); |
a302c105 | 958 | Gogo* gogo = context->gogo(); |
959 | Bvariable* bvar = this->statement_->get_backend_variable(context); | |
960 | Bexpression* var_ref = gogo->backend()->var_expression(bvar, loc); | |
961 | ||
ea664253 | 962 | Bexpression* bexpr = this->expr_->get_backend(context); |
a302c105 | 963 | Bstatement* set = gogo->backend()->assignment_statement(var_ref, bexpr, loc); |
964 | var_ref = gogo->backend()->var_expression(bvar, loc); | |
965 | Bexpression* ret = gogo->backend()->compound_expression(set, var_ref, loc); | |
ea664253 | 966 | return ret; |
e9d3367e | 967 | } |
968 | ||
969 | // Dump. | |
970 | ||
971 | void | |
972 | Set_and_use_temporary_expression::do_dump_expression( | |
973 | Ast_dump_context* ast_dump_context) const | |
974 | { | |
975 | ast_dump_context->ostream() << '('; | |
976 | ast_dump_context->dump_temp_variable_name(this->statement_); | |
977 | ast_dump_context->ostream() << " = "; | |
978 | this->expr_->dump_expression(ast_dump_context); | |
979 | ast_dump_context->ostream() << ')'; | |
980 | } | |
981 | ||
982 | // Make a set-and-use temporary. | |
983 | ||
984 | Set_and_use_temporary_expression* | |
985 | Expression::make_set_and_use_temporary(Temporary_statement* statement, | |
986 | Expression* expr, Location location) | |
987 | { | |
988 | return new Set_and_use_temporary_expression(statement, expr, location); | |
989 | } | |
990 | ||
e440a328 | 991 | // A sink expression--a use of the blank identifier _. |
992 | ||
993 | class Sink_expression : public Expression | |
994 | { | |
995 | public: | |
b13c66cd | 996 | Sink_expression(Location location) |
e440a328 | 997 | : Expression(EXPRESSION_SINK, location), |
aa93217a | 998 | type_(NULL), bvar_(NULL) |
e440a328 | 999 | { } |
1000 | ||
1001 | protected: | |
4f2138d7 | 1002 | bool |
e440a328 | 1003 | do_discarding_value() |
4f2138d7 | 1004 | { return true; } |
e440a328 | 1005 | |
1006 | Type* | |
1007 | do_type(); | |
1008 | ||
1009 | void | |
1010 | do_determine_type(const Type_context*); | |
1011 | ||
1012 | Expression* | |
1013 | do_copy() | |
1014 | { return new Sink_expression(this->location()); } | |
1015 | ||
ea664253 | 1016 | Bexpression* |
1017 | do_get_backend(Translate_context*); | |
e440a328 | 1018 | |
d751bb78 | 1019 | void |
1020 | do_dump_expression(Ast_dump_context*) const; | |
1021 | ||
e440a328 | 1022 | private: |
1023 | // The type of this sink variable. | |
1024 | Type* type_; | |
1025 | // The temporary variable we generate. | |
aa93217a | 1026 | Bvariable* bvar_; |
e440a328 | 1027 | }; |
1028 | ||
1029 | // Return the type of a sink expression. | |
1030 | ||
1031 | Type* | |
1032 | Sink_expression::do_type() | |
1033 | { | |
1034 | if (this->type_ == NULL) | |
1035 | return Type::make_sink_type(); | |
1036 | return this->type_; | |
1037 | } | |
1038 | ||
1039 | // Determine the type of a sink expression. | |
1040 | ||
1041 | void | |
1042 | Sink_expression::do_determine_type(const Type_context* context) | |
1043 | { | |
1044 | if (context->type != NULL) | |
1045 | this->type_ = context->type; | |
1046 | } | |
1047 | ||
1048 | // Return a temporary variable for a sink expression. This will | |
1049 | // presumably be a write-only variable which the middle-end will drop. | |
1050 | ||
ea664253 | 1051 | Bexpression* |
1052 | Sink_expression::do_get_backend(Translate_context* context) | |
e440a328 | 1053 | { |
aa93217a | 1054 | Location loc = this->location(); |
1055 | Gogo* gogo = context->gogo(); | |
1056 | if (this->bvar_ == NULL) | |
e440a328 | 1057 | { |
c484d925 | 1058 | go_assert(this->type_ != NULL && !this->type_->is_sink_type()); |
aa93217a | 1059 | Named_object* fn = context->function(); |
1060 | go_assert(fn != NULL); | |
1061 | Bfunction* fn_ctx = fn->func_value()->get_or_make_decl(gogo, fn); | |
9f0e0513 | 1062 | Btype* bt = this->type_->get_backend(context->gogo()); |
aa93217a | 1063 | Bstatement* decl; |
1064 | this->bvar_ = | |
1065 | gogo->backend()->temporary_variable(fn_ctx, context->bblock(), bt, NULL, | |
1066 | false, loc, &decl); | |
1067 | Bexpression* var_ref = gogo->backend()->var_expression(this->bvar_, loc); | |
1068 | var_ref = gogo->backend()->compound_expression(decl, var_ref, loc); | |
ea664253 | 1069 | return var_ref; |
e440a328 | 1070 | } |
ea664253 | 1071 | return gogo->backend()->var_expression(this->bvar_, loc); |
e440a328 | 1072 | } |
1073 | ||
d751bb78 | 1074 | // Ast dump for sink expression. |
1075 | ||
1076 | void | |
1077 | Sink_expression::do_dump_expression(Ast_dump_context* ast_dump_context) const | |
1078 | { | |
1079 | ast_dump_context->ostream() << "_" ; | |
1080 | } | |
1081 | ||
e440a328 | 1082 | // Make a sink expression. |
1083 | ||
1084 | Expression* | |
b13c66cd | 1085 | Expression::make_sink(Location location) |
e440a328 | 1086 | { |
1087 | return new Sink_expression(location); | |
1088 | } | |
1089 | ||
1090 | // Class Func_expression. | |
1091 | ||
1092 | // FIXME: Can a function expression appear in a constant expression? | |
1093 | // The value is unchanging. Initializing a constant to the address of | |
1094 | // a function seems like it could work, though there might be little | |
1095 | // point to it. | |
1096 | ||
e440a328 | 1097 | // Traversal. |
1098 | ||
1099 | int | |
1100 | Func_expression::do_traverse(Traverse* traverse) | |
1101 | { | |
1102 | return (this->closure_ == NULL | |
1103 | ? TRAVERSE_CONTINUE | |
1104 | : Expression::traverse(&this->closure_, traverse)); | |
1105 | } | |
1106 | ||
1107 | // Return the type of a function expression. | |
1108 | ||
1109 | Type* | |
1110 | Func_expression::do_type() | |
1111 | { | |
1112 | if (this->function_->is_function()) | |
1113 | return this->function_->func_value()->type(); | |
1114 | else if (this->function_->is_function_declaration()) | |
1115 | return this->function_->func_declaration_value()->type(); | |
1116 | else | |
c3e6f413 | 1117 | go_unreachable(); |
e440a328 | 1118 | } |
1119 | ||
ea664253 | 1120 | // Get the backend representation for the code of a function expression. |
e440a328 | 1121 | |
97267c39 | 1122 | Bexpression* |
8381eda7 | 1123 | Func_expression::get_code_pointer(Gogo* gogo, Named_object* no, Location loc) |
e440a328 | 1124 | { |
1125 | Function_type* fntype; | |
8381eda7 | 1126 | if (no->is_function()) |
1127 | fntype = no->func_value()->type(); | |
1128 | else if (no->is_function_declaration()) | |
1129 | fntype = no->func_declaration_value()->type(); | |
e440a328 | 1130 | else |
c3e6f413 | 1131 | go_unreachable(); |
e440a328 | 1132 | |
1133 | // Builtin functions are handled specially by Call_expression. We | |
1134 | // can't take their address. | |
1135 | if (fntype->is_builtin()) | |
1136 | { | |
631d5788 | 1137 | go_error_at(loc, |
1138 | "invalid use of special builtin function %qs; must be called", | |
1139 | no->message_name().c_str()); | |
97267c39 | 1140 | return gogo->backend()->error_expression(); |
e440a328 | 1141 | } |
1142 | ||
97267c39 | 1143 | Bfunction* fndecl; |
e440a328 | 1144 | if (no->is_function()) |
cf3cae55 | 1145 | fndecl = no->func_value()->get_or_make_decl(gogo, no); |
e440a328 | 1146 | else if (no->is_function_declaration()) |
cf3cae55 | 1147 | fndecl = no->func_declaration_value()->get_or_make_decl(gogo, no); |
e440a328 | 1148 | else |
c3e6f413 | 1149 | go_unreachable(); |
e440a328 | 1150 | |
97267c39 | 1151 | return gogo->backend()->function_code_expression(fndecl, loc); |
e440a328 | 1152 | } |
1153 | ||
ea664253 | 1154 | // Get the backend representation for a function expression. This is used when |
1155 | // we take the address of a function rather than simply calling it. A func | |
8381eda7 | 1156 | // value is represented as a pointer to a block of memory. The first |
1157 | // word of that memory is a pointer to the function code. The | |
1158 | // remaining parts of that memory are the addresses of variables that | |
1159 | // the function closes over. | |
e440a328 | 1160 | |
ea664253 | 1161 | Bexpression* |
1162 | Func_expression::do_get_backend(Translate_context* context) | |
e440a328 | 1163 | { |
8381eda7 | 1164 | // If there is no closure, just use the function descriptor. |
2010c17a | 1165 | if (this->closure_ == NULL) |
8381eda7 | 1166 | { |
1167 | Gogo* gogo = context->gogo(); | |
1168 | Named_object* no = this->function_; | |
1169 | Expression* descriptor; | |
1170 | if (no->is_function()) | |
1171 | descriptor = no->func_value()->descriptor(gogo, no); | |
1172 | else if (no->is_function_declaration()) | |
1173 | { | |
1174 | if (no->func_declaration_value()->type()->is_builtin()) | |
1175 | { | |
631d5788 | 1176 | go_error_at(this->location(), |
1177 | ("invalid use of special builtin function %qs; " | |
1178 | "must be called"), | |
1179 | no->message_name().c_str()); | |
ea664253 | 1180 | return gogo->backend()->error_expression(); |
8381eda7 | 1181 | } |
1182 | descriptor = no->func_declaration_value()->descriptor(gogo, no); | |
1183 | } | |
1184 | else | |
1185 | go_unreachable(); | |
2010c17a | 1186 | |
ea664253 | 1187 | Bexpression* bdesc = descriptor->get_backend(context); |
1188 | return gogo->backend()->address_expression(bdesc, this->location()); | |
8381eda7 | 1189 | } |
e440a328 | 1190 | |
8381eda7 | 1191 | go_assert(this->function_->func_value()->enclosing() != NULL); |
e440a328 | 1192 | |
8381eda7 | 1193 | // If there is a closure, then the closure is itself the function |
1194 | // expression. It is a pointer to a struct whose first field points | |
1195 | // to the function code and whose remaining fields are the addresses | |
1196 | // of the closed-over variables. | |
ea664253 | 1197 | return this->closure_->get_backend(context); |
e440a328 | 1198 | } |
1199 | ||
d751bb78 | 1200 | // Ast dump for function. |
1201 | ||
1202 | void | |
1203 | Func_expression::do_dump_expression(Ast_dump_context* ast_dump_context) const | |
1204 | { | |
8b1c301d | 1205 | ast_dump_context->ostream() << this->function_->name(); |
1206 | if (this->closure_ != NULL) | |
1207 | { | |
1208 | ast_dump_context->ostream() << " {closure = "; | |
1209 | this->closure_->dump_expression(ast_dump_context); | |
1210 | ast_dump_context->ostream() << "}"; | |
1211 | } | |
d751bb78 | 1212 | } |
1213 | ||
e440a328 | 1214 | // Make a reference to a function in an expression. |
1215 | ||
1216 | Expression* | |
1217 | Expression::make_func_reference(Named_object* function, Expression* closure, | |
b13c66cd | 1218 | Location location) |
e440a328 | 1219 | { |
b1d7ecfa | 1220 | Func_expression* fe = new Func_expression(function, closure, location); |
1221 | ||
1222 | // Detect references to builtin functions and set the runtime code if | |
1223 | // appropriate. | |
1224 | if (function->is_function_declaration()) | |
1225 | fe->set_runtime_code(Runtime::name_to_code(function->name())); | |
1226 | return fe; | |
e440a328 | 1227 | } |
1228 | ||
c6837989 | 1229 | // Class Func_descriptor_expression. |
8381eda7 | 1230 | |
c6837989 | 1231 | // Constructor. |
8381eda7 | 1232 | |
c6837989 | 1233 | Func_descriptor_expression::Func_descriptor_expression(Named_object* fn) |
1234 | : Expression(EXPRESSION_FUNC_DESCRIPTOR, fn->location()), | |
f8bdf81a | 1235 | fn_(fn), dvar_(NULL) |
c6837989 | 1236 | { |
1237 | go_assert(!fn->is_function() || !fn->func_value()->needs_closure()); | |
1238 | } | |
8381eda7 | 1239 | |
c6837989 | 1240 | // Traversal. |
8381eda7 | 1241 | |
c6837989 | 1242 | int |
1243 | Func_descriptor_expression::do_traverse(Traverse*) | |
1244 | { | |
1245 | return TRAVERSE_CONTINUE; | |
1246 | } | |
8381eda7 | 1247 | |
1248 | // All function descriptors have the same type. | |
1249 | ||
1250 | Type* Func_descriptor_expression::descriptor_type; | |
1251 | ||
1252 | void | |
1253 | Func_descriptor_expression::make_func_descriptor_type() | |
1254 | { | |
1255 | if (Func_descriptor_expression::descriptor_type != NULL) | |
1256 | return; | |
1257 | Type* uintptr_type = Type::lookup_integer_type("uintptr"); | |
1258 | Type* struct_type = Type::make_builtin_struct_type(1, "code", uintptr_type); | |
1259 | Func_descriptor_expression::descriptor_type = | |
1260 | Type::make_builtin_named_type("functionDescriptor", struct_type); | |
1261 | } | |
1262 | ||
1263 | Type* | |
1264 | Func_descriptor_expression::do_type() | |
1265 | { | |
1266 | Func_descriptor_expression::make_func_descriptor_type(); | |
1267 | return Func_descriptor_expression::descriptor_type; | |
1268 | } | |
1269 | ||
ea664253 | 1270 | // The backend representation for a function descriptor. |
8381eda7 | 1271 | |
ea664253 | 1272 | Bexpression* |
1273 | Func_descriptor_expression::do_get_backend(Translate_context* context) | |
8381eda7 | 1274 | { |
8381eda7 | 1275 | Named_object* no = this->fn_; |
1276 | Location loc = no->location(); | |
ea664253 | 1277 | if (this->dvar_ != NULL) |
1278 | return context->backend()->var_expression(this->dvar_, loc); | |
8381eda7 | 1279 | |
ea664253 | 1280 | Gogo* gogo = context->gogo(); |
8381eda7 | 1281 | std::string var_name; |
09e57698 | 1282 | bool is_descriptor = false; |
1283 | if (no->is_function_declaration() | |
1284 | && !no->func_declaration_value()->asm_name().empty() | |
1285 | && Linemap::is_predeclared_location(no->location())) | |
1286 | { | |
6098d6cb | 1287 | if (no->func_declaration_value()->asm_name().substr(0, 8) != "runtime.") |
1288 | var_name = no->func_declaration_value()->asm_name() + "_descriptor"; | |
1289 | else | |
1290 | var_name = no->func_declaration_value()->asm_name() + "$descriptor"; | |
09e57698 | 1291 | is_descriptor = true; |
1292 | } | |
8381eda7 | 1293 | else |
09e57698 | 1294 | { |
1295 | if (no->package() == NULL) | |
1296 | var_name = gogo->pkgpath_symbol(); | |
1297 | else | |
1298 | var_name = no->package()->pkgpath_symbol(); | |
1299 | var_name.push_back('.'); | |
1300 | var_name.append(Gogo::unpack_hidden_name(no->name())); | |
1301 | var_name.append("$descriptor"); | |
1302 | } | |
8381eda7 | 1303 | |
1304 | Btype* btype = this->type()->get_backend(gogo); | |
1305 | ||
1306 | Bvariable* bvar; | |
09e57698 | 1307 | if (no->package() != NULL || is_descriptor) |
f8bdf81a | 1308 | bvar = context->backend()->immutable_struct_reference(var_name, btype, |
1309 | loc); | |
8381eda7 | 1310 | else |
1311 | { | |
1312 | Location bloc = Linemap::predeclared_location(); | |
1313 | bool is_hidden = ((no->is_function() | |
1314 | && no->func_value()->enclosing() != NULL) | |
1315 | || Gogo::is_thunk(no)); | |
1316 | bvar = context->backend()->immutable_struct(var_name, is_hidden, false, | |
1317 | btype, bloc); | |
1318 | Expression_list* vals = new Expression_list(); | |
f8bdf81a | 1319 | vals->push_back(Expression::make_func_code_reference(this->fn_, bloc)); |
8381eda7 | 1320 | Expression* init = |
1321 | Expression::make_struct_composite_literal(this->type(), vals, bloc); | |
1322 | Translate_context bcontext(gogo, NULL, NULL, NULL); | |
1323 | bcontext.set_is_const(); | |
ea664253 | 1324 | Bexpression* binit = init->get_backend(&bcontext); |
8381eda7 | 1325 | context->backend()->immutable_struct_set_init(bvar, var_name, is_hidden, |
1326 | false, btype, bloc, binit); | |
1327 | } | |
1328 | ||
1329 | this->dvar_ = bvar; | |
ea664253 | 1330 | return gogo->backend()->var_expression(bvar, loc); |
8381eda7 | 1331 | } |
1332 | ||
c6837989 | 1333 | // Print a function descriptor expression. |
1334 | ||
1335 | void | |
1336 | Func_descriptor_expression::do_dump_expression(Ast_dump_context* context) const | |
1337 | { | |
1338 | context->ostream() << "[descriptor " << this->fn_->name() << "]"; | |
1339 | } | |
1340 | ||
8381eda7 | 1341 | // Make a function descriptor expression. |
1342 | ||
c6837989 | 1343 | Func_descriptor_expression* |
1344 | Expression::make_func_descriptor(Named_object* fn) | |
8381eda7 | 1345 | { |
c6837989 | 1346 | return new Func_descriptor_expression(fn); |
8381eda7 | 1347 | } |
1348 | ||
1349 | // Make the function descriptor type, so that it can be converted. | |
1350 | ||
1351 | void | |
1352 | Expression::make_func_descriptor_type() | |
1353 | { | |
1354 | Func_descriptor_expression::make_func_descriptor_type(); | |
1355 | } | |
1356 | ||
1357 | // A reference to just the code of a function. | |
1358 | ||
1359 | class Func_code_reference_expression : public Expression | |
1360 | { | |
1361 | public: | |
1362 | Func_code_reference_expression(Named_object* function, Location location) | |
1363 | : Expression(EXPRESSION_FUNC_CODE_REFERENCE, location), | |
1364 | function_(function) | |
1365 | { } | |
1366 | ||
1367 | protected: | |
1368 | int | |
1369 | do_traverse(Traverse*) | |
1370 | { return TRAVERSE_CONTINUE; } | |
1371 | ||
f9ca30f9 | 1372 | bool |
3ae06f68 | 1373 | do_is_static_initializer() const |
f9ca30f9 | 1374 | { return true; } |
1375 | ||
8381eda7 | 1376 | Type* |
1377 | do_type() | |
1378 | { return Type::make_pointer_type(Type::make_void_type()); } | |
1379 | ||
1380 | void | |
1381 | do_determine_type(const Type_context*) | |
1382 | { } | |
1383 | ||
1384 | Expression* | |
1385 | do_copy() | |
1386 | { | |
1387 | return Expression::make_func_code_reference(this->function_, | |
1388 | this->location()); | |
1389 | } | |
1390 | ||
ea664253 | 1391 | Bexpression* |
1392 | do_get_backend(Translate_context*); | |
8381eda7 | 1393 | |
1394 | void | |
1395 | do_dump_expression(Ast_dump_context* context) const | |
1396 | { context->ostream() << "[raw " << this->function_->name() << "]" ; } | |
1397 | ||
1398 | private: | |
1399 | // The function. | |
1400 | Named_object* function_; | |
1401 | }; | |
1402 | ||
ea664253 | 1403 | // Get the backend representation for a reference to function code. |
8381eda7 | 1404 | |
ea664253 | 1405 | Bexpression* |
1406 | Func_code_reference_expression::do_get_backend(Translate_context* context) | |
8381eda7 | 1407 | { |
ea664253 | 1408 | return Func_expression::get_code_pointer(context->gogo(), this->function_, |
1409 | this->location()); | |
8381eda7 | 1410 | } |
1411 | ||
1412 | // Make a reference to the code of a function. | |
1413 | ||
1414 | Expression* | |
1415 | Expression::make_func_code_reference(Named_object* function, Location location) | |
1416 | { | |
1417 | return new Func_code_reference_expression(function, location); | |
1418 | } | |
1419 | ||
e440a328 | 1420 | // Class Unknown_expression. |
1421 | ||
1422 | // Return the name of an unknown expression. | |
1423 | ||
1424 | const std::string& | |
1425 | Unknown_expression::name() const | |
1426 | { | |
1427 | return this->named_object_->name(); | |
1428 | } | |
1429 | ||
1430 | // Lower a reference to an unknown name. | |
1431 | ||
1432 | Expression* | |
ceeb4318 | 1433 | Unknown_expression::do_lower(Gogo*, Named_object*, Statement_inserter*, int) |
e440a328 | 1434 | { |
b13c66cd | 1435 | Location location = this->location(); |
e440a328 | 1436 | Named_object* no = this->named_object_; |
deded542 | 1437 | Named_object* real; |
1438 | if (!no->is_unknown()) | |
1439 | real = no; | |
1440 | else | |
e440a328 | 1441 | { |
deded542 | 1442 | real = no->unknown_value()->real_named_object(); |
1443 | if (real == NULL) | |
1444 | { | |
1445 | if (this->is_composite_literal_key_) | |
1446 | return this; | |
acf8e158 | 1447 | if (!this->no_error_message_) |
631d5788 | 1448 | go_error_at(location, "reference to undefined name %qs", |
1449 | this->named_object_->message_name().c_str()); | |
deded542 | 1450 | return Expression::make_error(location); |
1451 | } | |
e440a328 | 1452 | } |
1453 | switch (real->classification()) | |
1454 | { | |
1455 | case Named_object::NAMED_OBJECT_CONST: | |
1456 | return Expression::make_const_reference(real, location); | |
1457 | case Named_object::NAMED_OBJECT_TYPE: | |
1458 | return Expression::make_type(real->type_value(), location); | |
1459 | case Named_object::NAMED_OBJECT_TYPE_DECLARATION: | |
1460 | if (this->is_composite_literal_key_) | |
1461 | return this; | |
acf8e158 | 1462 | if (!this->no_error_message_) |
631d5788 | 1463 | go_error_at(location, "reference to undefined type %qs", |
1464 | real->message_name().c_str()); | |
e440a328 | 1465 | return Expression::make_error(location); |
1466 | case Named_object::NAMED_OBJECT_VAR: | |
7d834090 | 1467 | real->var_value()->set_is_used(); |
e440a328 | 1468 | return Expression::make_var_reference(real, location); |
1469 | case Named_object::NAMED_OBJECT_FUNC: | |
1470 | case Named_object::NAMED_OBJECT_FUNC_DECLARATION: | |
1471 | return Expression::make_func_reference(real, NULL, location); | |
1472 | case Named_object::NAMED_OBJECT_PACKAGE: | |
1473 | if (this->is_composite_literal_key_) | |
1474 | return this; | |
acf8e158 | 1475 | if (!this->no_error_message_) |
631d5788 | 1476 | go_error_at(location, "unexpected reference to package"); |
e440a328 | 1477 | return Expression::make_error(location); |
1478 | default: | |
c3e6f413 | 1479 | go_unreachable(); |
e440a328 | 1480 | } |
1481 | } | |
1482 | ||
d751bb78 | 1483 | // Dump the ast representation for an unknown expression to a dump context. |
1484 | ||
1485 | void | |
1486 | Unknown_expression::do_dump_expression(Ast_dump_context* ast_dump_context) const | |
1487 | { | |
1488 | ast_dump_context->ostream() << "_Unknown_(" << this->named_object_->name() | |
1489 | << ")"; | |
d751bb78 | 1490 | } |
1491 | ||
e440a328 | 1492 | // Make a reference to an unknown name. |
1493 | ||
acf8e158 | 1494 | Unknown_expression* |
b13c66cd | 1495 | Expression::make_unknown_reference(Named_object* no, Location location) |
e440a328 | 1496 | { |
e440a328 | 1497 | return new Unknown_expression(no, location); |
1498 | } | |
1499 | ||
1500 | // A boolean expression. | |
1501 | ||
1502 | class Boolean_expression : public Expression | |
1503 | { | |
1504 | public: | |
b13c66cd | 1505 | Boolean_expression(bool val, Location location) |
e440a328 | 1506 | : Expression(EXPRESSION_BOOLEAN, location), |
1507 | val_(val), type_(NULL) | |
1508 | { } | |
1509 | ||
1510 | static Expression* | |
1511 | do_import(Import*); | |
1512 | ||
1513 | protected: | |
1514 | bool | |
1515 | do_is_constant() const | |
1516 | { return true; } | |
1517 | ||
0e168074 | 1518 | bool |
3ae06f68 | 1519 | do_is_static_initializer() const |
0e168074 | 1520 | { return true; } |
1521 | ||
e440a328 | 1522 | Type* |
1523 | do_type(); | |
1524 | ||
1525 | void | |
1526 | do_determine_type(const Type_context*); | |
1527 | ||
1528 | Expression* | |
1529 | do_copy() | |
1530 | { return this; } | |
1531 | ||
ea664253 | 1532 | Bexpression* |
1533 | do_get_backend(Translate_context* context) | |
1534 | { return context->backend()->boolean_constant_expression(this->val_); } | |
e440a328 | 1535 | |
1536 | void | |
1537 | do_export(Export* exp) const | |
1538 | { exp->write_c_string(this->val_ ? "true" : "false"); } | |
1539 | ||
d751bb78 | 1540 | void |
1541 | do_dump_expression(Ast_dump_context* ast_dump_context) const | |
1542 | { ast_dump_context->ostream() << (this->val_ ? "true" : "false"); } | |
1543 | ||
e440a328 | 1544 | private: |
1545 | // The constant. | |
1546 | bool val_; | |
1547 | // The type as determined by context. | |
1548 | Type* type_; | |
1549 | }; | |
1550 | ||
1551 | // Get the type. | |
1552 | ||
1553 | Type* | |
1554 | Boolean_expression::do_type() | |
1555 | { | |
1556 | if (this->type_ == NULL) | |
1557 | this->type_ = Type::make_boolean_type(); | |
1558 | return this->type_; | |
1559 | } | |
1560 | ||
1561 | // Set the type from the context. | |
1562 | ||
1563 | void | |
1564 | Boolean_expression::do_determine_type(const Type_context* context) | |
1565 | { | |
1566 | if (this->type_ != NULL && !this->type_->is_abstract()) | |
1567 | ; | |
1568 | else if (context->type != NULL && context->type->is_boolean_type()) | |
1569 | this->type_ = context->type; | |
1570 | else if (!context->may_be_abstract) | |
1571 | this->type_ = Type::lookup_bool_type(); | |
1572 | } | |
1573 | ||
1574 | // Import a boolean constant. | |
1575 | ||
1576 | Expression* | |
1577 | Boolean_expression::do_import(Import* imp) | |
1578 | { | |
1579 | if (imp->peek_char() == 't') | |
1580 | { | |
1581 | imp->require_c_string("true"); | |
1582 | return Expression::make_boolean(true, imp->location()); | |
1583 | } | |
1584 | else | |
1585 | { | |
1586 | imp->require_c_string("false"); | |
1587 | return Expression::make_boolean(false, imp->location()); | |
1588 | } | |
1589 | } | |
1590 | ||
1591 | // Make a boolean expression. | |
1592 | ||
1593 | Expression* | |
b13c66cd | 1594 | Expression::make_boolean(bool val, Location location) |
e440a328 | 1595 | { |
1596 | return new Boolean_expression(val, location); | |
1597 | } | |
1598 | ||
1599 | // Class String_expression. | |
1600 | ||
1601 | // Get the type. | |
1602 | ||
1603 | Type* | |
1604 | String_expression::do_type() | |
1605 | { | |
1606 | if (this->type_ == NULL) | |
1607 | this->type_ = Type::make_string_type(); | |
1608 | return this->type_; | |
1609 | } | |
1610 | ||
1611 | // Set the type from the context. | |
1612 | ||
1613 | void | |
1614 | String_expression::do_determine_type(const Type_context* context) | |
1615 | { | |
1616 | if (this->type_ != NULL && !this->type_->is_abstract()) | |
1617 | ; | |
1618 | else if (context->type != NULL && context->type->is_string_type()) | |
1619 | this->type_ = context->type; | |
1620 | else if (!context->may_be_abstract) | |
1621 | this->type_ = Type::lookup_string_type(); | |
1622 | } | |
1623 | ||
1624 | // Build a string constant. | |
1625 | ||
ea664253 | 1626 | Bexpression* |
1627 | String_expression::do_get_backend(Translate_context* context) | |
e440a328 | 1628 | { |
2c809f8f | 1629 | Gogo* gogo = context->gogo(); |
1630 | Btype* btype = Type::make_string_type()->get_backend(gogo); | |
1631 | ||
1632 | Location loc = this->location(); | |
1633 | std::vector<Bexpression*> init(2); | |
1634 | Bexpression* str_cst = | |
1635 | gogo->backend()->string_constant_expression(this->val_); | |
1636 | init[0] = gogo->backend()->address_expression(str_cst, loc); | |
1637 | ||
1638 | Btype* int_btype = Type::lookup_integer_type("int")->get_backend(gogo); | |
1639 | mpz_t lenval; | |
1640 | mpz_init_set_ui(lenval, this->val_.length()); | |
1641 | init[1] = gogo->backend()->integer_constant_expression(int_btype, lenval); | |
1642 | mpz_clear(lenval); | |
1643 | ||
ea664253 | 1644 | return gogo->backend()->constructor_expression(btype, init, loc); |
e440a328 | 1645 | } |
1646 | ||
8b1c301d | 1647 | // Write string literal to string dump. |
e440a328 | 1648 | |
1649 | void | |
8b1c301d | 1650 | String_expression::export_string(String_dump* exp, |
1651 | const String_expression* str) | |
e440a328 | 1652 | { |
1653 | std::string s; | |
8b1c301d | 1654 | s.reserve(str->val_.length() * 4 + 2); |
e440a328 | 1655 | s += '"'; |
8b1c301d | 1656 | for (std::string::const_iterator p = str->val_.begin(); |
1657 | p != str->val_.end(); | |
e440a328 | 1658 | ++p) |
1659 | { | |
1660 | if (*p == '\\' || *p == '"') | |
1661 | { | |
1662 | s += '\\'; | |
1663 | s += *p; | |
1664 | } | |
1665 | else if (*p >= 0x20 && *p < 0x7f) | |
1666 | s += *p; | |
1667 | else if (*p == '\n') | |
1668 | s += "\\n"; | |
1669 | else if (*p == '\t') | |
1670 | s += "\\t"; | |
1671 | else | |
1672 | { | |
1673 | s += "\\x"; | |
1674 | unsigned char c = *p; | |
1675 | unsigned int dig = c >> 4; | |
1676 | s += dig < 10 ? '0' + dig : 'A' + dig - 10; | |
1677 | dig = c & 0xf; | |
1678 | s += dig < 10 ? '0' + dig : 'A' + dig - 10; | |
1679 | } | |
1680 | } | |
1681 | s += '"'; | |
1682 | exp->write_string(s); | |
1683 | } | |
1684 | ||
8b1c301d | 1685 | // Export a string expression. |
1686 | ||
1687 | void | |
1688 | String_expression::do_export(Export* exp) const | |
1689 | { | |
1690 | String_expression::export_string(exp, this); | |
1691 | } | |
1692 | ||
e440a328 | 1693 | // Import a string expression. |
1694 | ||
1695 | Expression* | |
1696 | String_expression::do_import(Import* imp) | |
1697 | { | |
1698 | imp->require_c_string("\""); | |
1699 | std::string val; | |
1700 | while (true) | |
1701 | { | |
1702 | int c = imp->get_char(); | |
1703 | if (c == '"' || c == -1) | |
1704 | break; | |
1705 | if (c != '\\') | |
1706 | val += static_cast<char>(c); | |
1707 | else | |
1708 | { | |
1709 | c = imp->get_char(); | |
1710 | if (c == '\\' || c == '"') | |
1711 | val += static_cast<char>(c); | |
1712 | else if (c == 'n') | |
1713 | val += '\n'; | |
1714 | else if (c == 't') | |
1715 | val += '\t'; | |
1716 | else if (c == 'x') | |
1717 | { | |
1718 | c = imp->get_char(); | |
1719 | unsigned int vh = c >= '0' && c <= '9' ? c - '0' : c - 'A' + 10; | |
1720 | c = imp->get_char(); | |
1721 | unsigned int vl = c >= '0' && c <= '9' ? c - '0' : c - 'A' + 10; | |
1722 | char v = (vh << 4) | vl; | |
1723 | val += v; | |
1724 | } | |
1725 | else | |
1726 | { | |
631d5788 | 1727 | go_error_at(imp->location(), "bad string constant"); |
e440a328 | 1728 | return Expression::make_error(imp->location()); |
1729 | } | |
1730 | } | |
1731 | } | |
1732 | return Expression::make_string(val, imp->location()); | |
1733 | } | |
1734 | ||
d751bb78 | 1735 | // Ast dump for string expression. |
1736 | ||
1737 | void | |
1738 | String_expression::do_dump_expression(Ast_dump_context* ast_dump_context) const | |
1739 | { | |
8b1c301d | 1740 | String_expression::export_string(ast_dump_context, this); |
d751bb78 | 1741 | } |
1742 | ||
e440a328 | 1743 | // Make a string expression. |
1744 | ||
1745 | Expression* | |
b13c66cd | 1746 | Expression::make_string(const std::string& val, Location location) |
e440a328 | 1747 | { |
1748 | return new String_expression(val, location); | |
1749 | } | |
1750 | ||
2c809f8f | 1751 | // An expression that evaluates to some characteristic of a string. |
1752 | // This is used when indexing, bound-checking, or nil checking a string. | |
1753 | ||
1754 | class String_info_expression : public Expression | |
1755 | { | |
1756 | public: | |
1757 | String_info_expression(Expression* string, String_info string_info, | |
1758 | Location location) | |
1759 | : Expression(EXPRESSION_STRING_INFO, location), | |
1760 | string_(string), string_info_(string_info) | |
1761 | { } | |
1762 | ||
1763 | protected: | |
1764 | Type* | |
1765 | do_type(); | |
1766 | ||
1767 | void | |
1768 | do_determine_type(const Type_context*) | |
1769 | { go_unreachable(); } | |
1770 | ||
1771 | Expression* | |
1772 | do_copy() | |
1773 | { | |
1774 | return new String_info_expression(this->string_->copy(), this->string_info_, | |
1775 | this->location()); | |
1776 | } | |
1777 | ||
ea664253 | 1778 | Bexpression* |
1779 | do_get_backend(Translate_context* context); | |
2c809f8f | 1780 | |
1781 | void | |
1782 | do_dump_expression(Ast_dump_context*) const; | |
1783 | ||
1784 | void | |
1785 | do_issue_nil_check() | |
1786 | { this->string_->issue_nil_check(); } | |
1787 | ||
1788 | private: | |
1789 | // The string for which we are getting information. | |
1790 | Expression* string_; | |
1791 | // What information we want. | |
1792 | String_info string_info_; | |
1793 | }; | |
1794 | ||
1795 | // Return the type of the string info. | |
1796 | ||
1797 | Type* | |
1798 | String_info_expression::do_type() | |
1799 | { | |
1800 | switch (this->string_info_) | |
1801 | { | |
1802 | case STRING_INFO_DATA: | |
1803 | { | |
1804 | Type* byte_type = Type::lookup_integer_type("uint8"); | |
1805 | return Type::make_pointer_type(byte_type); | |
1806 | } | |
1807 | case STRING_INFO_LENGTH: | |
1808 | return Type::lookup_integer_type("int"); | |
1809 | default: | |
1810 | go_unreachable(); | |
1811 | } | |
1812 | } | |
1813 | ||
1814 | // Return string information in GENERIC. | |
1815 | ||
ea664253 | 1816 | Bexpression* |
1817 | String_info_expression::do_get_backend(Translate_context* context) | |
2c809f8f | 1818 | { |
1819 | Gogo* gogo = context->gogo(); | |
1820 | ||
ea664253 | 1821 | Bexpression* bstring = this->string_->get_backend(context); |
2c809f8f | 1822 | switch (this->string_info_) |
1823 | { | |
1824 | case STRING_INFO_DATA: | |
1825 | case STRING_INFO_LENGTH: | |
ea664253 | 1826 | return gogo->backend()->struct_field_expression(bstring, |
1827 | this->string_info_, | |
1828 | this->location()); | |
2c809f8f | 1829 | break; |
1830 | default: | |
1831 | go_unreachable(); | |
1832 | } | |
2c809f8f | 1833 | } |
1834 | ||
1835 | // Dump ast representation for a type info expression. | |
1836 | ||
1837 | void | |
1838 | String_info_expression::do_dump_expression( | |
1839 | Ast_dump_context* ast_dump_context) const | |
1840 | { | |
1841 | ast_dump_context->ostream() << "stringinfo("; | |
1842 | this->string_->dump_expression(ast_dump_context); | |
1843 | ast_dump_context->ostream() << ","; | |
1844 | ast_dump_context->ostream() << | |
1845 | (this->string_info_ == STRING_INFO_DATA ? "data" | |
1846 | : this->string_info_ == STRING_INFO_LENGTH ? "length" | |
1847 | : "unknown"); | |
1848 | ast_dump_context->ostream() << ")"; | |
1849 | } | |
1850 | ||
1851 | // Make a string info expression. | |
1852 | ||
1853 | Expression* | |
1854 | Expression::make_string_info(Expression* string, String_info string_info, | |
1855 | Location location) | |
1856 | { | |
1857 | return new String_info_expression(string, string_info, location); | |
1858 | } | |
1859 | ||
e440a328 | 1860 | // Make an integer expression. |
1861 | ||
1862 | class Integer_expression : public Expression | |
1863 | { | |
1864 | public: | |
5d4b8566 | 1865 | Integer_expression(const mpz_t* val, Type* type, bool is_character_constant, |
1866 | Location location) | |
e440a328 | 1867 | : Expression(EXPRESSION_INTEGER, location), |
5d4b8566 | 1868 | type_(type), is_character_constant_(is_character_constant) |
e440a328 | 1869 | { mpz_init_set(this->val_, *val); } |
1870 | ||
1871 | static Expression* | |
1872 | do_import(Import*); | |
1873 | ||
8b1c301d | 1874 | // Write VAL to string dump. |
e440a328 | 1875 | static void |
8b1c301d | 1876 | export_integer(String_dump* exp, const mpz_t val); |
e440a328 | 1877 | |
d751bb78 | 1878 | // Write VAL to dump context. |
1879 | static void | |
1880 | dump_integer(Ast_dump_context* ast_dump_context, const mpz_t val); | |
1881 | ||
e440a328 | 1882 | protected: |
1883 | bool | |
1884 | do_is_constant() const | |
1885 | { return true; } | |
1886 | ||
0e168074 | 1887 | bool |
3ae06f68 | 1888 | do_is_static_initializer() const |
0e168074 | 1889 | { return true; } |
1890 | ||
e440a328 | 1891 | bool |
0c77715b | 1892 | do_numeric_constant_value(Numeric_constant* nc) const; |
e440a328 | 1893 | |
1894 | Type* | |
1895 | do_type(); | |
1896 | ||
1897 | void | |
1898 | do_determine_type(const Type_context* context); | |
1899 | ||
1900 | void | |
1901 | do_check_types(Gogo*); | |
1902 | ||
ea664253 | 1903 | Bexpression* |
1904 | do_get_backend(Translate_context*); | |
e440a328 | 1905 | |
1906 | Expression* | |
1907 | do_copy() | |
5d4b8566 | 1908 | { |
1909 | if (this->is_character_constant_) | |
1910 | return Expression::make_character(&this->val_, this->type_, | |
1911 | this->location()); | |
1912 | else | |
e67508fa | 1913 | return Expression::make_integer_z(&this->val_, this->type_, |
1914 | this->location()); | |
5d4b8566 | 1915 | } |
e440a328 | 1916 | |
1917 | void | |
1918 | do_export(Export*) const; | |
1919 | ||
d751bb78 | 1920 | void |
1921 | do_dump_expression(Ast_dump_context*) const; | |
1922 | ||
e440a328 | 1923 | private: |
1924 | // The integer value. | |
1925 | mpz_t val_; | |
1926 | // The type so far. | |
1927 | Type* type_; | |
5d4b8566 | 1928 | // Whether this is a character constant. |
1929 | bool is_character_constant_; | |
e440a328 | 1930 | }; |
1931 | ||
0c77715b | 1932 | // Return a numeric constant for this expression. We have to mark |
1933 | // this as a character when appropriate. | |
e440a328 | 1934 | |
1935 | bool | |
0c77715b | 1936 | Integer_expression::do_numeric_constant_value(Numeric_constant* nc) const |
e440a328 | 1937 | { |
0c77715b | 1938 | if (this->is_character_constant_) |
1939 | nc->set_rune(this->type_, this->val_); | |
1940 | else | |
1941 | nc->set_int(this->type_, this->val_); | |
e440a328 | 1942 | return true; |
1943 | } | |
1944 | ||
1945 | // Return the current type. If we haven't set the type yet, we return | |
1946 | // an abstract integer type. | |
1947 | ||
1948 | Type* | |
1949 | Integer_expression::do_type() | |
1950 | { | |
1951 | if (this->type_ == NULL) | |
5d4b8566 | 1952 | { |
1953 | if (this->is_character_constant_) | |
1954 | this->type_ = Type::make_abstract_character_type(); | |
1955 | else | |
1956 | this->type_ = Type::make_abstract_integer_type(); | |
1957 | } | |
e440a328 | 1958 | return this->type_; |
1959 | } | |
1960 | ||
1961 | // Set the type of the integer value. Here we may switch from an | |
1962 | // abstract type to a real type. | |
1963 | ||
1964 | void | |
1965 | Integer_expression::do_determine_type(const Type_context* context) | |
1966 | { | |
1967 | if (this->type_ != NULL && !this->type_->is_abstract()) | |
1968 | ; | |
0c77715b | 1969 | else if (context->type != NULL && context->type->is_numeric_type()) |
e440a328 | 1970 | this->type_ = context->type; |
1971 | else if (!context->may_be_abstract) | |
5d4b8566 | 1972 | { |
1973 | if (this->is_character_constant_) | |
1974 | this->type_ = Type::lookup_integer_type("int32"); | |
1975 | else | |
1976 | this->type_ = Type::lookup_integer_type("int"); | |
1977 | } | |
e440a328 | 1978 | } |
1979 | ||
e440a328 | 1980 | // Check the type of an integer constant. |
1981 | ||
1982 | void | |
1983 | Integer_expression::do_check_types(Gogo*) | |
1984 | { | |
0c77715b | 1985 | Type* type = this->type_; |
1986 | if (type == NULL) | |
e440a328 | 1987 | return; |
0c77715b | 1988 | Numeric_constant nc; |
1989 | if (this->is_character_constant_) | |
1990 | nc.set_rune(NULL, this->val_); | |
1991 | else | |
1992 | nc.set_int(NULL, this->val_); | |
1993 | if (!nc.set_type(type, true, this->location())) | |
e440a328 | 1994 | this->set_is_error(); |
1995 | } | |
1996 | ||
ea664253 | 1997 | // Get the backend representation for an integer constant. |
e440a328 | 1998 | |
ea664253 | 1999 | Bexpression* |
2000 | Integer_expression::do_get_backend(Translate_context* context) | |
e440a328 | 2001 | { |
12373dd5 | 2002 | if (this->is_error_expression() |
2003 | || (this->type_ != NULL && this->type_->is_error_type())) | |
2004 | { | |
2005 | go_assert(saw_errors()); | |
2006 | return context->gogo()->backend()->error_expression(); | |
2007 | } | |
2008 | ||
48c2a53a | 2009 | Type* resolved_type = NULL; |
e440a328 | 2010 | if (this->type_ != NULL && !this->type_->is_abstract()) |
48c2a53a | 2011 | resolved_type = this->type_; |
e440a328 | 2012 | else if (this->type_ != NULL && this->type_->float_type() != NULL) |
2013 | { | |
2014 | // We are converting to an abstract floating point type. | |
48c2a53a | 2015 | resolved_type = Type::lookup_float_type("float64"); |
e440a328 | 2016 | } |
2017 | else if (this->type_ != NULL && this->type_->complex_type() != NULL) | |
2018 | { | |
2019 | // We are converting to an abstract complex type. | |
48c2a53a | 2020 | resolved_type = Type::lookup_complex_type("complex128"); |
e440a328 | 2021 | } |
2022 | else | |
2023 | { | |
2024 | // If we still have an abstract type here, then this is being | |
2025 | // used in a constant expression which didn't get reduced for | |
2026 | // some reason. Use a type which will fit the value. We use <, | |
2027 | // not <=, because we need an extra bit for the sign bit. | |
2028 | int bits = mpz_sizeinbase(this->val_, 2); | |
1b1f2abf | 2029 | Type* int_type = Type::lookup_integer_type("int"); |
2030 | if (bits < int_type->integer_type()->bits()) | |
48c2a53a | 2031 | resolved_type = int_type; |
e440a328 | 2032 | else if (bits < 64) |
48c2a53a | 2033 | resolved_type = Type::lookup_integer_type("int64"); |
e440a328 | 2034 | else |
48c2a53a | 2035 | { |
2036 | if (!saw_errors()) | |
631d5788 | 2037 | go_error_at(this->location(), |
2038 | "unknown type for large integer constant"); | |
ea664253 | 2039 | return context->gogo()->backend()->error_expression(); |
48c2a53a | 2040 | } |
e440a328 | 2041 | } |
48c2a53a | 2042 | Numeric_constant nc; |
2043 | nc.set_int(resolved_type, this->val_); | |
ea664253 | 2044 | return Expression::backend_numeric_constant_expression(context, &nc); |
e440a328 | 2045 | } |
2046 | ||
2047 | // Write VAL to export data. | |
2048 | ||
2049 | void | |
8b1c301d | 2050 | Integer_expression::export_integer(String_dump* exp, const mpz_t val) |
e440a328 | 2051 | { |
2052 | char* s = mpz_get_str(NULL, 10, val); | |
2053 | exp->write_c_string(s); | |
2054 | free(s); | |
2055 | } | |
2056 | ||
2057 | // Export an integer in a constant expression. | |
2058 | ||
2059 | void | |
2060 | Integer_expression::do_export(Export* exp) const | |
2061 | { | |
2062 | Integer_expression::export_integer(exp, this->val_); | |
5d4b8566 | 2063 | if (this->is_character_constant_) |
2064 | exp->write_c_string("'"); | |
e440a328 | 2065 | // A trailing space lets us reliably identify the end of the number. |
2066 | exp->write_c_string(" "); | |
2067 | } | |
2068 | ||
2069 | // Import an integer, floating point, or complex value. This handles | |
2070 | // all these types because they all start with digits. | |
2071 | ||
2072 | Expression* | |
2073 | Integer_expression::do_import(Import* imp) | |
2074 | { | |
2075 | std::string num = imp->read_identifier(); | |
2076 | imp->require_c_string(" "); | |
2077 | if (!num.empty() && num[num.length() - 1] == 'i') | |
2078 | { | |
2079 | mpfr_t real; | |
2080 | size_t plus_pos = num.find('+', 1); | |
2081 | size_t minus_pos = num.find('-', 1); | |
2082 | size_t pos; | |
2083 | if (plus_pos == std::string::npos) | |
2084 | pos = minus_pos; | |
2085 | else if (minus_pos == std::string::npos) | |
2086 | pos = plus_pos; | |
2087 | else | |
2088 | { | |
631d5788 | 2089 | go_error_at(imp->location(), "bad number in import data: %qs", |
2090 | num.c_str()); | |
e440a328 | 2091 | return Expression::make_error(imp->location()); |
2092 | } | |
2093 | if (pos == std::string::npos) | |
2094 | mpfr_set_ui(real, 0, GMP_RNDN); | |
2095 | else | |
2096 | { | |
2097 | std::string real_str = num.substr(0, pos); | |
2098 | if (mpfr_init_set_str(real, real_str.c_str(), 10, GMP_RNDN) != 0) | |
2099 | { | |
631d5788 | 2100 | go_error_at(imp->location(), "bad number in import data: %qs", |
2101 | real_str.c_str()); | |
e440a328 | 2102 | return Expression::make_error(imp->location()); |
2103 | } | |
2104 | } | |
2105 | ||
2106 | std::string imag_str; | |
2107 | if (pos == std::string::npos) | |
2108 | imag_str = num; | |
2109 | else | |
2110 | imag_str = num.substr(pos); | |
2111 | imag_str = imag_str.substr(0, imag_str.size() - 1); | |
2112 | mpfr_t imag; | |
2113 | if (mpfr_init_set_str(imag, imag_str.c_str(), 10, GMP_RNDN) != 0) | |
2114 | { | |
631d5788 | 2115 | go_error_at(imp->location(), "bad number in import data: %qs", |
2116 | imag_str.c_str()); | |
e440a328 | 2117 | return Expression::make_error(imp->location()); |
2118 | } | |
fcbea5e4 | 2119 | mpc_t cval; |
2120 | mpc_init2(cval, mpc_precision); | |
2121 | mpc_set_fr_fr(cval, real, imag, MPC_RNDNN); | |
e440a328 | 2122 | mpfr_clear(real); |
2123 | mpfr_clear(imag); | |
fcbea5e4 | 2124 | Expression* ret = Expression::make_complex(&cval, NULL, imp->location()); |
2125 | mpc_clear(cval); | |
e440a328 | 2126 | return ret; |
2127 | } | |
2128 | else if (num.find('.') == std::string::npos | |
2129 | && num.find('E') == std::string::npos) | |
2130 | { | |
5d4b8566 | 2131 | bool is_character_constant = (!num.empty() |
2132 | && num[num.length() - 1] == '\''); | |
2133 | if (is_character_constant) | |
2134 | num = num.substr(0, num.length() - 1); | |
e440a328 | 2135 | mpz_t val; |
2136 | if (mpz_init_set_str(val, num.c_str(), 10) != 0) | |
2137 | { | |
631d5788 | 2138 | go_error_at(imp->location(), "bad number in import data: %qs", |
2139 | num.c_str()); | |
e440a328 | 2140 | return Expression::make_error(imp->location()); |
2141 | } | |
5d4b8566 | 2142 | Expression* ret; |
2143 | if (is_character_constant) | |
2144 | ret = Expression::make_character(&val, NULL, imp->location()); | |
2145 | else | |
e67508fa | 2146 | ret = Expression::make_integer_z(&val, NULL, imp->location()); |
e440a328 | 2147 | mpz_clear(val); |
2148 | return ret; | |
2149 | } | |
2150 | else | |
2151 | { | |
2152 | mpfr_t val; | |
2153 | if (mpfr_init_set_str(val, num.c_str(), 10, GMP_RNDN) != 0) | |
2154 | { | |
631d5788 | 2155 | go_error_at(imp->location(), "bad number in import data: %qs", |
2156 | num.c_str()); | |
e440a328 | 2157 | return Expression::make_error(imp->location()); |
2158 | } | |
2159 | Expression* ret = Expression::make_float(&val, NULL, imp->location()); | |
2160 | mpfr_clear(val); | |
2161 | return ret; | |
2162 | } | |
2163 | } | |
d751bb78 | 2164 | // Ast dump for integer expression. |
2165 | ||
2166 | void | |
2167 | Integer_expression::do_dump_expression(Ast_dump_context* ast_dump_context) const | |
2168 | { | |
5d4b8566 | 2169 | if (this->is_character_constant_) |
2170 | ast_dump_context->ostream() << '\''; | |
8b1c301d | 2171 | Integer_expression::export_integer(ast_dump_context, this->val_); |
5d4b8566 | 2172 | if (this->is_character_constant_) |
2173 | ast_dump_context->ostream() << '\''; | |
d751bb78 | 2174 | } |
2175 | ||
e67508fa | 2176 | // Build a new integer value from a multi-precision integer. |
e440a328 | 2177 | |
2178 | Expression* | |
e67508fa | 2179 | Expression::make_integer_z(const mpz_t* val, Type* type, Location location) |
5d4b8566 | 2180 | { |
2181 | return new Integer_expression(val, type, false, location); | |
2182 | } | |
2183 | ||
e67508fa | 2184 | // Build a new integer value from an unsigned long. |
2185 | ||
2186 | Expression* | |
2187 | Expression::make_integer_ul(unsigned long val, Type *type, Location location) | |
2188 | { | |
2189 | mpz_t zval; | |
2190 | mpz_init_set_ui(zval, val); | |
2191 | Expression* ret = Expression::make_integer_z(&zval, type, location); | |
2192 | mpz_clear(zval); | |
2193 | return ret; | |
2194 | } | |
2195 | ||
2196 | // Build a new integer value from a signed long. | |
2197 | ||
2198 | Expression* | |
2199 | Expression::make_integer_sl(long val, Type *type, Location location) | |
2200 | { | |
2201 | mpz_t zval; | |
2202 | mpz_init_set_si(zval, val); | |
2203 | Expression* ret = Expression::make_integer_z(&zval, type, location); | |
2204 | mpz_clear(zval); | |
2205 | return ret; | |
2206 | } | |
2207 | ||
3f378015 | 2208 | // Store an int64_t in an uninitialized mpz_t. |
2209 | ||
2210 | static void | |
2211 | set_mpz_from_int64(mpz_t* zval, int64_t val) | |
2212 | { | |
2213 | if (val >= 0) | |
2214 | { | |
2215 | unsigned long ul = static_cast<unsigned long>(val); | |
2216 | if (static_cast<int64_t>(ul) == val) | |
2217 | { | |
2218 | mpz_init_set_ui(*zval, ul); | |
2219 | return; | |
2220 | } | |
2221 | } | |
2222 | uint64_t uv; | |
2223 | if (val >= 0) | |
2224 | uv = static_cast<uint64_t>(val); | |
2225 | else | |
2226 | uv = static_cast<uint64_t>(- val); | |
2227 | unsigned long ul = uv & 0xffffffffUL; | |
2228 | mpz_init_set_ui(*zval, ul); | |
2229 | mpz_t hval; | |
2230 | mpz_init_set_ui(hval, static_cast<unsigned long>(uv >> 32)); | |
2231 | mpz_mul_2exp(hval, hval, 32); | |
2232 | mpz_add(*zval, *zval, hval); | |
2233 | mpz_clear(hval); | |
2234 | if (val < 0) | |
2235 | mpz_neg(*zval, *zval); | |
2236 | } | |
2237 | ||
2238 | // Build a new integer value from an int64_t. | |
2239 | ||
2240 | Expression* | |
2241 | Expression::make_integer_int64(int64_t val, Type* type, Location location) | |
2242 | { | |
2243 | mpz_t zval; | |
2244 | set_mpz_from_int64(&zval, val); | |
2245 | Expression* ret = Expression::make_integer_z(&zval, type, location); | |
2246 | mpz_clear(zval); | |
2247 | return ret; | |
2248 | } | |
2249 | ||
5d4b8566 | 2250 | // Build a new character constant value. |
2251 | ||
2252 | Expression* | |
2253 | Expression::make_character(const mpz_t* val, Type* type, Location location) | |
e440a328 | 2254 | { |
5d4b8566 | 2255 | return new Integer_expression(val, type, true, location); |
e440a328 | 2256 | } |
2257 | ||
2258 | // Floats. | |
2259 | ||
2260 | class Float_expression : public Expression | |
2261 | { | |
2262 | public: | |
b13c66cd | 2263 | Float_expression(const mpfr_t* val, Type* type, Location location) |
e440a328 | 2264 | : Expression(EXPRESSION_FLOAT, location), |
2265 | type_(type) | |
2266 | { | |
2267 | mpfr_init_set(this->val_, *val, GMP_RNDN); | |
2268 | } | |
2269 | ||
e440a328 | 2270 | // Write VAL to export data. |
2271 | static void | |
8b1c301d | 2272 | export_float(String_dump* exp, const mpfr_t val); |
2273 | ||
d751bb78 | 2274 | // Write VAL to dump file. |
2275 | static void | |
2276 | dump_float(Ast_dump_context* ast_dump_context, const mpfr_t val); | |
e440a328 | 2277 | |
2278 | protected: | |
2279 | bool | |
2280 | do_is_constant() const | |
2281 | { return true; } | |
2282 | ||
0e168074 | 2283 | bool |
3ae06f68 | 2284 | do_is_static_initializer() const |
0e168074 | 2285 | { return true; } |
2286 | ||
e440a328 | 2287 | bool |
0c77715b | 2288 | do_numeric_constant_value(Numeric_constant* nc) const |
2289 | { | |
2290 | nc->set_float(this->type_, this->val_); | |
2291 | return true; | |
2292 | } | |
e440a328 | 2293 | |
2294 | Type* | |
2295 | do_type(); | |
2296 | ||
2297 | void | |
2298 | do_determine_type(const Type_context*); | |
2299 | ||
2300 | void | |
2301 | do_check_types(Gogo*); | |
2302 | ||
2303 | Expression* | |
2304 | do_copy() | |
2305 | { return Expression::make_float(&this->val_, this->type_, | |
2306 | this->location()); } | |
2307 | ||
ea664253 | 2308 | Bexpression* |
2309 | do_get_backend(Translate_context*); | |
e440a328 | 2310 | |
2311 | void | |
2312 | do_export(Export*) const; | |
2313 | ||
d751bb78 | 2314 | void |
2315 | do_dump_expression(Ast_dump_context*) const; | |
2316 | ||
e440a328 | 2317 | private: |
2318 | // The floating point value. | |
2319 | mpfr_t val_; | |
2320 | // The type so far. | |
2321 | Type* type_; | |
2322 | }; | |
2323 | ||
e440a328 | 2324 | // Return the current type. If we haven't set the type yet, we return |
2325 | // an abstract float type. | |
2326 | ||
2327 | Type* | |
2328 | Float_expression::do_type() | |
2329 | { | |
2330 | if (this->type_ == NULL) | |
2331 | this->type_ = Type::make_abstract_float_type(); | |
2332 | return this->type_; | |
2333 | } | |
2334 | ||
2335 | // Set the type of the float value. Here we may switch from an | |
2336 | // abstract type to a real type. | |
2337 | ||
2338 | void | |
2339 | Float_expression::do_determine_type(const Type_context* context) | |
2340 | { | |
2341 | if (this->type_ != NULL && !this->type_->is_abstract()) | |
2342 | ; | |
2343 | else if (context->type != NULL | |
2344 | && (context->type->integer_type() != NULL | |
2345 | || context->type->float_type() != NULL | |
2346 | || context->type->complex_type() != NULL)) | |
2347 | this->type_ = context->type; | |
2348 | else if (!context->may_be_abstract) | |
48080209 | 2349 | this->type_ = Type::lookup_float_type("float64"); |
e440a328 | 2350 | } |
2351 | ||
e440a328 | 2352 | // Check the type of a float value. |
2353 | ||
2354 | void | |
2355 | Float_expression::do_check_types(Gogo*) | |
2356 | { | |
0c77715b | 2357 | Type* type = this->type_; |
2358 | if (type == NULL) | |
e440a328 | 2359 | return; |
0c77715b | 2360 | Numeric_constant nc; |
2361 | nc.set_float(NULL, this->val_); | |
2362 | if (!nc.set_type(this->type_, true, this->location())) | |
e440a328 | 2363 | this->set_is_error(); |
e440a328 | 2364 | } |
2365 | ||
ea664253 | 2366 | // Get the backend representation for a float constant. |
e440a328 | 2367 | |
ea664253 | 2368 | Bexpression* |
2369 | Float_expression::do_get_backend(Translate_context* context) | |
e440a328 | 2370 | { |
12373dd5 | 2371 | if (this->is_error_expression() |
2372 | || (this->type_ != NULL && this->type_->is_error_type())) | |
2373 | { | |
2374 | go_assert(saw_errors()); | |
2375 | return context->gogo()->backend()->error_expression(); | |
2376 | } | |
2377 | ||
48c2a53a | 2378 | Type* resolved_type; |
e440a328 | 2379 | if (this->type_ != NULL && !this->type_->is_abstract()) |
48c2a53a | 2380 | resolved_type = this->type_; |
e440a328 | 2381 | else if (this->type_ != NULL && this->type_->integer_type() != NULL) |
2382 | { | |
2383 | // We have an abstract integer type. We just hope for the best. | |
48c2a53a | 2384 | resolved_type = Type::lookup_integer_type("int"); |
2385 | } | |
2386 | else if (this->type_ != NULL && this->type_->complex_type() != NULL) | |
2387 | { | |
2388 | // We are converting to an abstract complex type. | |
2389 | resolved_type = Type::lookup_complex_type("complex128"); | |
e440a328 | 2390 | } |
2391 | else | |
2392 | { | |
2393 | // If we still have an abstract type here, then this is being | |
2394 | // used in a constant expression which didn't get reduced. We | |
2395 | // just use float64 and hope for the best. | |
48c2a53a | 2396 | resolved_type = Type::lookup_float_type("float64"); |
e440a328 | 2397 | } |
48c2a53a | 2398 | |
2399 | Numeric_constant nc; | |
2400 | nc.set_float(resolved_type, this->val_); | |
ea664253 | 2401 | return Expression::backend_numeric_constant_expression(context, &nc); |
e440a328 | 2402 | } |
2403 | ||
8b1c301d | 2404 | // Write a floating point number to a string dump. |
e440a328 | 2405 | |
2406 | void | |
8b1c301d | 2407 | Float_expression::export_float(String_dump *exp, const mpfr_t val) |
e440a328 | 2408 | { |
2409 | mp_exp_t exponent; | |
2410 | char* s = mpfr_get_str(NULL, &exponent, 10, 0, val, GMP_RNDN); | |
2411 | if (*s == '-') | |
2412 | exp->write_c_string("-"); | |
2413 | exp->write_c_string("0."); | |
2414 | exp->write_c_string(*s == '-' ? s + 1 : s); | |
2415 | mpfr_free_str(s); | |
2416 | char buf[30]; | |
2417 | snprintf(buf, sizeof buf, "E%ld", exponent); | |
2418 | exp->write_c_string(buf); | |
2419 | } | |
2420 | ||
2421 | // Export a floating point number in a constant expression. | |
2422 | ||
2423 | void | |
2424 | Float_expression::do_export(Export* exp) const | |
2425 | { | |
2426 | Float_expression::export_float(exp, this->val_); | |
2427 | // A trailing space lets us reliably identify the end of the number. | |
2428 | exp->write_c_string(" "); | |
2429 | } | |
2430 | ||
d751bb78 | 2431 | // Dump a floating point number to the dump file. |
2432 | ||
2433 | void | |
2434 | Float_expression::do_dump_expression(Ast_dump_context* ast_dump_context) const | |
2435 | { | |
8b1c301d | 2436 | Float_expression::export_float(ast_dump_context, this->val_); |
d751bb78 | 2437 | } |
2438 | ||
e440a328 | 2439 | // Make a float expression. |
2440 | ||
2441 | Expression* | |
b13c66cd | 2442 | Expression::make_float(const mpfr_t* val, Type* type, Location location) |
e440a328 | 2443 | { |
2444 | return new Float_expression(val, type, location); | |
2445 | } | |
2446 | ||
2447 | // Complex numbers. | |
2448 | ||
2449 | class Complex_expression : public Expression | |
2450 | { | |
2451 | public: | |
fcbea5e4 | 2452 | Complex_expression(const mpc_t* val, Type* type, Location location) |
e440a328 | 2453 | : Expression(EXPRESSION_COMPLEX, location), |
2454 | type_(type) | |
2455 | { | |
fcbea5e4 | 2456 | mpc_init2(this->val_, mpc_precision); |
2457 | mpc_set(this->val_, *val, MPC_RNDNN); | |
e440a328 | 2458 | } |
2459 | ||
fcbea5e4 | 2460 | // Write VAL to string dump. |
e440a328 | 2461 | static void |
fcbea5e4 | 2462 | export_complex(String_dump* exp, const mpc_t val); |
e440a328 | 2463 | |
d751bb78 | 2464 | // Write REAL/IMAG to dump context. |
2465 | static void | |
fcbea5e4 | 2466 | dump_complex(Ast_dump_context* ast_dump_context, const mpc_t val); |
d751bb78 | 2467 | |
e440a328 | 2468 | protected: |
2469 | bool | |
2470 | do_is_constant() const | |
2471 | { return true; } | |
2472 | ||
0e168074 | 2473 | bool |
3ae06f68 | 2474 | do_is_static_initializer() const |
0e168074 | 2475 | { return true; } |
2476 | ||
e440a328 | 2477 | bool |
0c77715b | 2478 | do_numeric_constant_value(Numeric_constant* nc) const |
2479 | { | |
fcbea5e4 | 2480 | nc->set_complex(this->type_, this->val_); |
0c77715b | 2481 | return true; |
2482 | } | |
e440a328 | 2483 | |
2484 | Type* | |
2485 | do_type(); | |
2486 | ||
2487 | void | |
2488 | do_determine_type(const Type_context*); | |
2489 | ||
2490 | void | |
2491 | do_check_types(Gogo*); | |
2492 | ||
2493 | Expression* | |
2494 | do_copy() | |
2495 | { | |
fcbea5e4 | 2496 | return Expression::make_complex(&this->val_, this->type_, |
e440a328 | 2497 | this->location()); |
2498 | } | |
2499 | ||
ea664253 | 2500 | Bexpression* |
2501 | do_get_backend(Translate_context*); | |
e440a328 | 2502 | |
2503 | void | |
2504 | do_export(Export*) const; | |
2505 | ||
d751bb78 | 2506 | void |
2507 | do_dump_expression(Ast_dump_context*) const; | |
abd26de0 | 2508 | |
e440a328 | 2509 | private: |
fcbea5e4 | 2510 | // The complex value. |
2511 | mpc_t val_; | |
e440a328 | 2512 | // The type if known. |
2513 | Type* type_; | |
2514 | }; | |
2515 | ||
e440a328 | 2516 | // Return the current type. If we haven't set the type yet, we return |
2517 | // an abstract complex type. | |
2518 | ||
2519 | Type* | |
2520 | Complex_expression::do_type() | |
2521 | { | |
2522 | if (this->type_ == NULL) | |
2523 | this->type_ = Type::make_abstract_complex_type(); | |
2524 | return this->type_; | |
2525 | } | |
2526 | ||
2527 | // Set the type of the complex value. Here we may switch from an | |
2528 | // abstract type to a real type. | |
2529 | ||
2530 | void | |
2531 | Complex_expression::do_determine_type(const Type_context* context) | |
2532 | { | |
2533 | if (this->type_ != NULL && !this->type_->is_abstract()) | |
2534 | ; | |
abd26de0 | 2535 | else if (context->type != NULL && context->type->is_numeric_type()) |
e440a328 | 2536 | this->type_ = context->type; |
2537 | else if (!context->may_be_abstract) | |
48080209 | 2538 | this->type_ = Type::lookup_complex_type("complex128"); |
e440a328 | 2539 | } |
2540 | ||
e440a328 | 2541 | // Check the type of a complex value. |
2542 | ||
2543 | void | |
2544 | Complex_expression::do_check_types(Gogo*) | |
2545 | { | |
0c77715b | 2546 | Type* type = this->type_; |
2547 | if (type == NULL) | |
e440a328 | 2548 | return; |
0c77715b | 2549 | Numeric_constant nc; |
fcbea5e4 | 2550 | nc.set_complex(NULL, this->val_); |
0c77715b | 2551 | if (!nc.set_type(this->type_, true, this->location())) |
e440a328 | 2552 | this->set_is_error(); |
2553 | } | |
2554 | ||
ea664253 | 2555 | // Get the backend representation for a complex constant. |
e440a328 | 2556 | |
ea664253 | 2557 | Bexpression* |
2558 | Complex_expression::do_get_backend(Translate_context* context) | |
e440a328 | 2559 | { |
12373dd5 | 2560 | if (this->is_error_expression() |
2561 | || (this->type_ != NULL && this->type_->is_error_type())) | |
2562 | { | |
2563 | go_assert(saw_errors()); | |
2564 | return context->gogo()->backend()->error_expression(); | |
2565 | } | |
2566 | ||
48c2a53a | 2567 | Type* resolved_type; |
e440a328 | 2568 | if (this->type_ != NULL && !this->type_->is_abstract()) |
48c2a53a | 2569 | resolved_type = this->type_; |
2570 | else if (this->type_ != NULL && this->type_->integer_type() != NULL) | |
2571 | { | |
2572 | // We are converting to an abstract integer type. | |
2573 | resolved_type = Type::lookup_integer_type("int"); | |
2574 | } | |
2575 | else if (this->type_ != NULL && this->type_->float_type() != NULL) | |
2576 | { | |
2577 | // We are converting to an abstract float type. | |
2578 | resolved_type = Type::lookup_float_type("float64"); | |
2579 | } | |
e440a328 | 2580 | else |
2581 | { | |
47ae02b7 | 2582 | // If we still have an abstract type here, this is being |
e440a328 | 2583 | // used in a constant expression which didn't get reduced. We |
2584 | // just use complex128 and hope for the best. | |
48c2a53a | 2585 | resolved_type = Type::lookup_complex_type("complex128"); |
e440a328 | 2586 | } |
48c2a53a | 2587 | |
2588 | Numeric_constant nc; | |
fcbea5e4 | 2589 | nc.set_complex(resolved_type, this->val_); |
ea664253 | 2590 | return Expression::backend_numeric_constant_expression(context, &nc); |
e440a328 | 2591 | } |
2592 | ||
2593 | // Write REAL/IMAG to export data. | |
2594 | ||
2595 | void | |
fcbea5e4 | 2596 | Complex_expression::export_complex(String_dump* exp, const mpc_t val) |
e440a328 | 2597 | { |
fcbea5e4 | 2598 | if (!mpfr_zero_p(mpc_realref(val))) |
e440a328 | 2599 | { |
fcbea5e4 | 2600 | Float_expression::export_float(exp, mpc_realref(val)); |
d1db782d | 2601 | if (mpfr_sgn(mpc_imagref(val)) >= 0) |
e440a328 | 2602 | exp->write_c_string("+"); |
2603 | } | |
fcbea5e4 | 2604 | Float_expression::export_float(exp, mpc_imagref(val)); |
e440a328 | 2605 | exp->write_c_string("i"); |
2606 | } | |
2607 | ||
2608 | // Export a complex number in a constant expression. | |
2609 | ||
2610 | void | |
2611 | Complex_expression::do_export(Export* exp) const | |
2612 | { | |
fcbea5e4 | 2613 | Complex_expression::export_complex(exp, this->val_); |
e440a328 | 2614 | // A trailing space lets us reliably identify the end of the number. |
2615 | exp->write_c_string(" "); | |
2616 | } | |
2617 | ||
d751bb78 | 2618 | // Dump a complex expression to the dump file. |
2619 | ||
2620 | void | |
2621 | Complex_expression::do_dump_expression(Ast_dump_context* ast_dump_context) const | |
2622 | { | |
fcbea5e4 | 2623 | Complex_expression::export_complex(ast_dump_context, this->val_); |
d751bb78 | 2624 | } |
2625 | ||
e440a328 | 2626 | // Make a complex expression. |
2627 | ||
2628 | Expression* | |
fcbea5e4 | 2629 | Expression::make_complex(const mpc_t* val, Type* type, Location location) |
e440a328 | 2630 | { |
fcbea5e4 | 2631 | return new Complex_expression(val, type, location); |
e440a328 | 2632 | } |
2633 | ||
d5b605df | 2634 | // Find a named object in an expression. |
2635 | ||
2636 | class Find_named_object : public Traverse | |
2637 | { | |
2638 | public: | |
2639 | Find_named_object(Named_object* no) | |
2640 | : Traverse(traverse_expressions), | |
2641 | no_(no), found_(false) | |
2642 | { } | |
2643 | ||
2644 | // Whether we found the object. | |
2645 | bool | |
2646 | found() const | |
2647 | { return this->found_; } | |
2648 | ||
2649 | protected: | |
2650 | int | |
2651 | expression(Expression**); | |
2652 | ||
2653 | private: | |
2654 | // The object we are looking for. | |
2655 | Named_object* no_; | |
2656 | // Whether we found it. | |
2657 | bool found_; | |
2658 | }; | |
2659 | ||
e440a328 | 2660 | // A reference to a const in an expression. |
2661 | ||
2662 | class Const_expression : public Expression | |
2663 | { | |
2664 | public: | |
b13c66cd | 2665 | Const_expression(Named_object* constant, Location location) |
e440a328 | 2666 | : Expression(EXPRESSION_CONST_REFERENCE, location), |
13e818f5 | 2667 | constant_(constant), type_(NULL), seen_(false) |
e440a328 | 2668 | { } |
2669 | ||
d5b605df | 2670 | Named_object* |
2671 | named_object() | |
2672 | { return this->constant_; } | |
2673 | ||
a7f064d5 | 2674 | // Check that the initializer does not refer to the constant itself. |
2675 | void | |
2676 | check_for_init_loop(); | |
2677 | ||
e440a328 | 2678 | protected: |
ba4aedd4 | 2679 | int |
2680 | do_traverse(Traverse*); | |
2681 | ||
e440a328 | 2682 | Expression* |
ceeb4318 | 2683 | do_lower(Gogo*, Named_object*, Statement_inserter*, int); |
e440a328 | 2684 | |
2685 | bool | |
2686 | do_is_constant() const | |
2687 | { return true; } | |
2688 | ||
0e168074 | 2689 | bool |
3ae06f68 | 2690 | do_is_static_initializer() const |
0e168074 | 2691 | { return true; } |
2692 | ||
e440a328 | 2693 | bool |
0c77715b | 2694 | do_numeric_constant_value(Numeric_constant* nc) const; |
e440a328 | 2695 | |
2696 | bool | |
af6b489a | 2697 | do_string_constant_value(std::string* val) const; |
e440a328 | 2698 | |
2699 | Type* | |
2700 | do_type(); | |
2701 | ||
2702 | // The type of a const is set by the declaration, not the use. | |
2703 | void | |
2704 | do_determine_type(const Type_context*); | |
2705 | ||
2706 | void | |
2707 | do_check_types(Gogo*); | |
2708 | ||
2709 | Expression* | |
2710 | do_copy() | |
2711 | { return this; } | |
2712 | ||
ea664253 | 2713 | Bexpression* |
2714 | do_get_backend(Translate_context* context); | |
e440a328 | 2715 | |
2716 | // When exporting a reference to a const as part of a const | |
2717 | // expression, we export the value. We ignore the fact that it has | |
2718 | // a name. | |
2719 | void | |
2720 | do_export(Export* exp) const | |
2721 | { this->constant_->const_value()->expr()->export_expression(exp); } | |
2722 | ||
d751bb78 | 2723 | void |
2724 | do_dump_expression(Ast_dump_context*) const; | |
2725 | ||
e440a328 | 2726 | private: |
2727 | // The constant. | |
2728 | Named_object* constant_; | |
2729 | // The type of this reference. This is used if the constant has an | |
2730 | // abstract type. | |
2731 | Type* type_; | |
13e818f5 | 2732 | // Used to prevent infinite recursion when a constant incorrectly |
2733 | // refers to itself. | |
2734 | mutable bool seen_; | |
e440a328 | 2735 | }; |
2736 | ||
ba4aedd4 | 2737 | // Traversal. |
2738 | ||
2739 | int | |
2740 | Const_expression::do_traverse(Traverse* traverse) | |
2741 | { | |
2742 | if (this->type_ != NULL) | |
2743 | return Type::traverse(this->type_, traverse); | |
2744 | return TRAVERSE_CONTINUE; | |
2745 | } | |
2746 | ||
e440a328 | 2747 | // Lower a constant expression. This is where we convert the |
2748 | // predeclared constant iota into an integer value. | |
2749 | ||
2750 | Expression* | |
ceeb4318 | 2751 | Const_expression::do_lower(Gogo* gogo, Named_object*, |
2752 | Statement_inserter*, int iota_value) | |
e440a328 | 2753 | { |
2754 | if (this->constant_->const_value()->expr()->classification() | |
2755 | == EXPRESSION_IOTA) | |
2756 | { | |
2757 | if (iota_value == -1) | |
2758 | { | |
631d5788 | 2759 | go_error_at(this->location(), |
2760 | "iota is only defined in const declarations"); | |
e440a328 | 2761 | iota_value = 0; |
2762 | } | |
e67508fa | 2763 | return Expression::make_integer_ul(iota_value, NULL, this->location()); |
e440a328 | 2764 | } |
2765 | ||
2766 | // Make sure that the constant itself has been lowered. | |
2767 | gogo->lower_constant(this->constant_); | |
2768 | ||
2769 | return this; | |
2770 | } | |
2771 | ||
0c77715b | 2772 | // Return a numeric constant value. |
e440a328 | 2773 | |
2774 | bool | |
0c77715b | 2775 | Const_expression::do_numeric_constant_value(Numeric_constant* nc) const |
e440a328 | 2776 | { |
13e818f5 | 2777 | if (this->seen_) |
2778 | return false; | |
2779 | ||
e440a328 | 2780 | Expression* e = this->constant_->const_value()->expr(); |
0c77715b | 2781 | |
13e818f5 | 2782 | this->seen_ = true; |
2783 | ||
0c77715b | 2784 | bool r = e->numeric_constant_value(nc); |
e440a328 | 2785 | |
13e818f5 | 2786 | this->seen_ = false; |
2787 | ||
e440a328 | 2788 | Type* ctype; |
2789 | if (this->type_ != NULL) | |
2790 | ctype = this->type_; | |
2791 | else | |
2792 | ctype = this->constant_->const_value()->type(); | |
e440a328 | 2793 | if (r && ctype != NULL) |
2794 | { | |
0c77715b | 2795 | if (!nc->set_type(ctype, false, this->location())) |
e440a328 | 2796 | return false; |
e440a328 | 2797 | } |
e440a328 | 2798 | |
e440a328 | 2799 | return r; |
2800 | } | |
2801 | ||
af6b489a | 2802 | bool |
2803 | Const_expression::do_string_constant_value(std::string* val) const | |
2804 | { | |
2805 | if (this->seen_) | |
2806 | return false; | |
2807 | ||
2808 | Expression* e = this->constant_->const_value()->expr(); | |
2809 | ||
2810 | this->seen_ = true; | |
2811 | bool ok = e->string_constant_value(val); | |
2812 | this->seen_ = false; | |
2813 | ||
2814 | return ok; | |
2815 | } | |
2816 | ||
e440a328 | 2817 | // Return the type of the const reference. |
2818 | ||
2819 | Type* | |
2820 | Const_expression::do_type() | |
2821 | { | |
2822 | if (this->type_ != NULL) | |
2823 | return this->type_; | |
13e818f5 | 2824 | |
2f78f012 | 2825 | Named_constant* nc = this->constant_->const_value(); |
2826 | ||
2827 | if (this->seen_ || nc->lowering()) | |
13e818f5 | 2828 | { |
2829 | this->report_error(_("constant refers to itself")); | |
2830 | this->type_ = Type::make_error_type(); | |
2831 | return this->type_; | |
2832 | } | |
2833 | ||
2834 | this->seen_ = true; | |
2835 | ||
e440a328 | 2836 | Type* ret = nc->type(); |
13e818f5 | 2837 | |
e440a328 | 2838 | if (ret != NULL) |
13e818f5 | 2839 | { |
2840 | this->seen_ = false; | |
2841 | return ret; | |
2842 | } | |
2843 | ||
e440a328 | 2844 | // During parsing, a named constant may have a NULL type, but we |
2845 | // must not return a NULL type here. | |
13e818f5 | 2846 | ret = nc->expr()->type(); |
2847 | ||
2848 | this->seen_ = false; | |
2849 | ||
2850 | return ret; | |
e440a328 | 2851 | } |
2852 | ||
2853 | // Set the type of the const reference. | |
2854 | ||
2855 | void | |
2856 | Const_expression::do_determine_type(const Type_context* context) | |
2857 | { | |
2858 | Type* ctype = this->constant_->const_value()->type(); | |
2859 | Type* cetype = (ctype != NULL | |
2860 | ? ctype | |
2861 | : this->constant_->const_value()->expr()->type()); | |
2862 | if (ctype != NULL && !ctype->is_abstract()) | |
2863 | ; | |
2864 | else if (context->type != NULL | |
0c77715b | 2865 | && context->type->is_numeric_type() |
2866 | && cetype->is_numeric_type()) | |
e440a328 | 2867 | this->type_ = context->type; |
2868 | else if (context->type != NULL | |
2869 | && context->type->is_string_type() | |
2870 | && cetype->is_string_type()) | |
2871 | this->type_ = context->type; | |
2872 | else if (context->type != NULL | |
2873 | && context->type->is_boolean_type() | |
2874 | && cetype->is_boolean_type()) | |
2875 | this->type_ = context->type; | |
2876 | else if (!context->may_be_abstract) | |
2877 | { | |
2878 | if (cetype->is_abstract()) | |
2879 | cetype = cetype->make_non_abstract_type(); | |
2880 | this->type_ = cetype; | |
2881 | } | |
2882 | } | |
2883 | ||
a7f064d5 | 2884 | // Check for a loop in which the initializer of a constant refers to |
2885 | // the constant itself. | |
e440a328 | 2886 | |
2887 | void | |
a7f064d5 | 2888 | Const_expression::check_for_init_loop() |
e440a328 | 2889 | { |
5c13bd80 | 2890 | if (this->type_ != NULL && this->type_->is_error()) |
d5b605df | 2891 | return; |
2892 | ||
a7f064d5 | 2893 | if (this->seen_) |
2894 | { | |
2895 | this->report_error(_("constant refers to itself")); | |
2896 | this->type_ = Type::make_error_type(); | |
2897 | return; | |
2898 | } | |
2899 | ||
d5b605df | 2900 | Expression* init = this->constant_->const_value()->expr(); |
2901 | Find_named_object find_named_object(this->constant_); | |
a7f064d5 | 2902 | |
2903 | this->seen_ = true; | |
d5b605df | 2904 | Expression::traverse(&init, &find_named_object); |
a7f064d5 | 2905 | this->seen_ = false; |
2906 | ||
d5b605df | 2907 | if (find_named_object.found()) |
2908 | { | |
5c13bd80 | 2909 | if (this->type_ == NULL || !this->type_->is_error()) |
a7f064d5 | 2910 | { |
2911 | this->report_error(_("constant refers to itself")); | |
2912 | this->type_ = Type::make_error_type(); | |
2913 | } | |
d5b605df | 2914 | return; |
2915 | } | |
a7f064d5 | 2916 | } |
2917 | ||
2918 | // Check types of a const reference. | |
2919 | ||
2920 | void | |
2921 | Const_expression::do_check_types(Gogo*) | |
2922 | { | |
5c13bd80 | 2923 | if (this->type_ != NULL && this->type_->is_error()) |
a7f064d5 | 2924 | return; |
2925 | ||
2926 | this->check_for_init_loop(); | |
d5b605df | 2927 | |
0c77715b | 2928 | // Check that numeric constant fits in type. |
2929 | if (this->type_ != NULL && this->type_->is_numeric_type()) | |
e440a328 | 2930 | { |
0c77715b | 2931 | Numeric_constant nc; |
2932 | if (this->constant_->const_value()->expr()->numeric_constant_value(&nc)) | |
e440a328 | 2933 | { |
0c77715b | 2934 | if (!nc.set_type(this->type_, true, this->location())) |
2935 | this->set_is_error(); | |
e440a328 | 2936 | } |
e440a328 | 2937 | } |
2938 | } | |
2939 | ||
ea664253 | 2940 | // Return the backend representation for a const reference. |
e440a328 | 2941 | |
ea664253 | 2942 | Bexpression* |
2943 | Const_expression::do_get_backend(Translate_context* context) | |
e440a328 | 2944 | { |
12373dd5 | 2945 | if (this->is_error_expression() |
2946 | || (this->type_ != NULL && this->type_->is_error())) | |
2947 | { | |
2948 | go_assert(saw_errors()); | |
2949 | return context->backend()->error_expression(); | |
2950 | } | |
e440a328 | 2951 | |
2952 | // If the type has been set for this expression, but the underlying | |
2953 | // object is an abstract int or float, we try to get the abstract | |
2954 | // value. Otherwise we may lose something in the conversion. | |
f2de4532 | 2955 | Expression* expr = this->constant_->const_value()->expr(); |
e440a328 | 2956 | if (this->type_ != NULL |
0c77715b | 2957 | && this->type_->is_numeric_type() |
a68492b4 | 2958 | && (this->constant_->const_value()->type() == NULL |
2959 | || this->constant_->const_value()->type()->is_abstract())) | |
e440a328 | 2960 | { |
0c77715b | 2961 | Numeric_constant nc; |
2962 | if (expr->numeric_constant_value(&nc) | |
2963 | && nc.set_type(this->type_, false, this->location())) | |
e440a328 | 2964 | { |
0c77715b | 2965 | Expression* e = nc.expression(this->location()); |
ea664253 | 2966 | return e->get_backend(context); |
e440a328 | 2967 | } |
e440a328 | 2968 | } |
2969 | ||
2c809f8f | 2970 | if (this->type_ != NULL) |
f2de4532 | 2971 | expr = Expression::make_cast(this->type_, expr, this->location()); |
ea664253 | 2972 | return expr->get_backend(context); |
e440a328 | 2973 | } |
2974 | ||
d751bb78 | 2975 | // Dump ast representation for constant expression. |
2976 | ||
2977 | void | |
2978 | Const_expression::do_dump_expression(Ast_dump_context* ast_dump_context) const | |
2979 | { | |
2980 | ast_dump_context->ostream() << this->constant_->name(); | |
2981 | } | |
2982 | ||
e440a328 | 2983 | // Make a reference to a constant in an expression. |
2984 | ||
2985 | Expression* | |
2986 | Expression::make_const_reference(Named_object* constant, | |
b13c66cd | 2987 | Location location) |
e440a328 | 2988 | { |
2989 | return new Const_expression(constant, location); | |
2990 | } | |
2991 | ||
d5b605df | 2992 | // Find a named object in an expression. |
2993 | ||
2994 | int | |
2995 | Find_named_object::expression(Expression** pexpr) | |
2996 | { | |
2997 | switch ((*pexpr)->classification()) | |
2998 | { | |
2999 | case Expression::EXPRESSION_CONST_REFERENCE: | |
a7f064d5 | 3000 | { |
3001 | Const_expression* ce = static_cast<Const_expression*>(*pexpr); | |
3002 | if (ce->named_object() == this->no_) | |
3003 | break; | |
3004 | ||
3005 | // We need to check a constant initializer explicitly, as | |
3006 | // loops here will not be caught by the loop checking for | |
3007 | // variable initializers. | |
3008 | ce->check_for_init_loop(); | |
3009 | ||
3010 | return TRAVERSE_CONTINUE; | |
3011 | } | |
3012 | ||
d5b605df | 3013 | case Expression::EXPRESSION_VAR_REFERENCE: |
3014 | if ((*pexpr)->var_expression()->named_object() == this->no_) | |
3015 | break; | |
3016 | return TRAVERSE_CONTINUE; | |
3017 | case Expression::EXPRESSION_FUNC_REFERENCE: | |
3018 | if ((*pexpr)->func_expression()->named_object() == this->no_) | |
3019 | break; | |
3020 | return TRAVERSE_CONTINUE; | |
3021 | default: | |
3022 | return TRAVERSE_CONTINUE; | |
3023 | } | |
3024 | this->found_ = true; | |
3025 | return TRAVERSE_EXIT; | |
3026 | } | |
3027 | ||
e440a328 | 3028 | // The nil value. |
3029 | ||
3030 | class Nil_expression : public Expression | |
3031 | { | |
3032 | public: | |
b13c66cd | 3033 | Nil_expression(Location location) |
e440a328 | 3034 | : Expression(EXPRESSION_NIL, location) |
3035 | { } | |
3036 | ||
3037 | static Expression* | |
3038 | do_import(Import*); | |
3039 | ||
3040 | protected: | |
3041 | bool | |
3042 | do_is_constant() const | |
3043 | { return true; } | |
3044 | ||
f9ca30f9 | 3045 | bool |
3ae06f68 | 3046 | do_is_static_initializer() const |
f9ca30f9 | 3047 | { return true; } |
3048 | ||
e440a328 | 3049 | Type* |
3050 | do_type() | |
3051 | { return Type::make_nil_type(); } | |
3052 | ||
3053 | void | |
3054 | do_determine_type(const Type_context*) | |
3055 | { } | |
3056 | ||
3057 | Expression* | |
3058 | do_copy() | |
3059 | { return this; } | |
3060 | ||
ea664253 | 3061 | Bexpression* |
3062 | do_get_backend(Translate_context* context) | |
3063 | { return context->backend()->nil_pointer_expression(); } | |
e440a328 | 3064 | |
3065 | void | |
3066 | do_export(Export* exp) const | |
3067 | { exp->write_c_string("nil"); } | |
d751bb78 | 3068 | |
3069 | void | |
3070 | do_dump_expression(Ast_dump_context* ast_dump_context) const | |
3071 | { ast_dump_context->ostream() << "nil"; } | |
e440a328 | 3072 | }; |
3073 | ||
3074 | // Import a nil expression. | |
3075 | ||
3076 | Expression* | |
3077 | Nil_expression::do_import(Import* imp) | |
3078 | { | |
3079 | imp->require_c_string("nil"); | |
3080 | return Expression::make_nil(imp->location()); | |
3081 | } | |
3082 | ||
3083 | // Make a nil expression. | |
3084 | ||
3085 | Expression* | |
b13c66cd | 3086 | Expression::make_nil(Location location) |
e440a328 | 3087 | { |
3088 | return new Nil_expression(location); | |
3089 | } | |
3090 | ||
3091 | // The value of the predeclared constant iota. This is little more | |
3092 | // than a marker. This will be lowered to an integer in | |
3093 | // Const_expression::do_lower, which is where we know the value that | |
3094 | // it should have. | |
3095 | ||
3096 | class Iota_expression : public Parser_expression | |
3097 | { | |
3098 | public: | |
b13c66cd | 3099 | Iota_expression(Location location) |
e440a328 | 3100 | : Parser_expression(EXPRESSION_IOTA, location) |
3101 | { } | |
3102 | ||
3103 | protected: | |
3104 | Expression* | |
ceeb4318 | 3105 | do_lower(Gogo*, Named_object*, Statement_inserter*, int) |
c3e6f413 | 3106 | { go_unreachable(); } |
e440a328 | 3107 | |
3108 | // There should only ever be one of these. | |
3109 | Expression* | |
3110 | do_copy() | |
c3e6f413 | 3111 | { go_unreachable(); } |
d751bb78 | 3112 | |
3113 | void | |
3114 | do_dump_expression(Ast_dump_context* ast_dump_context) const | |
3115 | { ast_dump_context->ostream() << "iota"; } | |
e440a328 | 3116 | }; |
3117 | ||
3118 | // Make an iota expression. This is only called for one case: the | |
3119 | // value of the predeclared constant iota. | |
3120 | ||
3121 | Expression* | |
3122 | Expression::make_iota() | |
3123 | { | |
b13c66cd | 3124 | static Iota_expression iota_expression(Linemap::unknown_location()); |
e440a328 | 3125 | return &iota_expression; |
3126 | } | |
3127 | ||
da244e59 | 3128 | // Class Type_conversion_expression. |
e440a328 | 3129 | |
3130 | // Traversal. | |
3131 | ||
3132 | int | |
3133 | Type_conversion_expression::do_traverse(Traverse* traverse) | |
3134 | { | |
3135 | if (Expression::traverse(&this->expr_, traverse) == TRAVERSE_EXIT | |
3136 | || Type::traverse(this->type_, traverse) == TRAVERSE_EXIT) | |
3137 | return TRAVERSE_EXIT; | |
3138 | return TRAVERSE_CONTINUE; | |
3139 | } | |
3140 | ||
3141 | // Convert to a constant at lowering time. | |
3142 | ||
3143 | Expression* | |
ceeb4318 | 3144 | Type_conversion_expression::do_lower(Gogo*, Named_object*, |
3145 | Statement_inserter*, int) | |
e440a328 | 3146 | { |
3147 | Type* type = this->type_; | |
3148 | Expression* val = this->expr_; | |
b13c66cd | 3149 | Location location = this->location(); |
e440a328 | 3150 | |
0c77715b | 3151 | if (type->is_numeric_type()) |
e440a328 | 3152 | { |
0c77715b | 3153 | Numeric_constant nc; |
3154 | if (val->numeric_constant_value(&nc)) | |
e440a328 | 3155 | { |
0c77715b | 3156 | if (!nc.set_type(type, true, location)) |
3157 | return Expression::make_error(location); | |
3158 | return nc.expression(location); | |
e440a328 | 3159 | } |
e440a328 | 3160 | } |
3161 | ||
d7739c9a | 3162 | // According to the language specification on string conversions |
3163 | // (http://golang.org/ref/spec#Conversions_to_and_from_a_string_type): | |
3164 | // When converting an integer into a string, the string will be a UTF-8 | |
3165 | // representation of the integer and integers "outside the range of valid | |
3166 | // Unicode code points are converted to '\uFFFD'." | |
3167 | if (type->is_string_type()) | |
3168 | { | |
3169 | Numeric_constant nc; | |
3170 | if (val->numeric_constant_value(&nc) && nc.is_int()) | |
3171 | { | |
3172 | // An integer value doesn't fit in the Unicode code point range if it | |
3173 | // overflows the Go "int" type or is negative. | |
3174 | unsigned long ul; | |
3175 | if (!nc.set_type(Type::lookup_integer_type("int"), false, location) | |
3176 | || nc.to_unsigned_long(&ul) == Numeric_constant::NC_UL_NEGATIVE) | |
3177 | return Expression::make_string("\ufffd", location); | |
3178 | } | |
3179 | } | |
3180 | ||
55072f2b | 3181 | if (type->is_slice_type()) |
e440a328 | 3182 | { |
3183 | Type* element_type = type->array_type()->element_type()->forwarded(); | |
60963afd | 3184 | bool is_byte = (element_type->integer_type() != NULL |
3185 | && element_type->integer_type()->is_byte()); | |
3186 | bool is_rune = (element_type->integer_type() != NULL | |
3187 | && element_type->integer_type()->is_rune()); | |
3188 | if (is_byte || is_rune) | |
e440a328 | 3189 | { |
3190 | std::string s; | |
3191 | if (val->string_constant_value(&s)) | |
3192 | { | |
3193 | Expression_list* vals = new Expression_list(); | |
3194 | if (is_byte) | |
3195 | { | |
3196 | for (std::string::const_iterator p = s.begin(); | |
3197 | p != s.end(); | |
3198 | p++) | |
3199 | { | |
e67508fa | 3200 | unsigned char c = static_cast<unsigned char>(*p); |
3201 | vals->push_back(Expression::make_integer_ul(c, | |
3202 | element_type, | |
3203 | location)); | |
e440a328 | 3204 | } |
3205 | } | |
3206 | else | |
3207 | { | |
3208 | const char *p = s.data(); | |
3209 | const char *pend = s.data() + s.length(); | |
3210 | while (p < pend) | |
3211 | { | |
3212 | unsigned int c; | |
3213 | int adv = Lex::fetch_char(p, &c); | |
3214 | if (adv == 0) | |
3215 | { | |
631d5788 | 3216 | go_warning_at(this->location(), 0, |
e440a328 | 3217 | "invalid UTF-8 encoding"); |
3218 | adv = 1; | |
3219 | } | |
3220 | p += adv; | |
e67508fa | 3221 | vals->push_back(Expression::make_integer_ul(c, |
3222 | element_type, | |
3223 | location)); | |
e440a328 | 3224 | } |
3225 | } | |
3226 | ||
3227 | return Expression::make_slice_composite_literal(type, vals, | |
3228 | location); | |
3229 | } | |
3230 | } | |
3231 | } | |
3232 | ||
3233 | return this; | |
3234 | } | |
3235 | ||
35a54f17 | 3236 | // Flatten a type conversion by using a temporary variable for the slice |
3237 | // in slice to string conversions. | |
3238 | ||
3239 | Expression* | |
3240 | Type_conversion_expression::do_flatten(Gogo*, Named_object*, | |
3241 | Statement_inserter* inserter) | |
3242 | { | |
5bf8be8b | 3243 | if (this->type()->is_error_type() || this->expr_->is_error_expression()) |
3244 | { | |
3245 | go_assert(saw_errors()); | |
3246 | return Expression::make_error(this->location()); | |
3247 | } | |
3248 | ||
2c809f8f | 3249 | if (((this->type()->is_string_type() |
3250 | && this->expr_->type()->is_slice_type()) | |
8ba8cc87 | 3251 | || this->expr_->type()->interface_type() != NULL) |
35a54f17 | 3252 | && !this->expr_->is_variable()) |
3253 | { | |
3254 | Temporary_statement* temp = | |
3255 | Statement::make_temporary(NULL, this->expr_, this->location()); | |
3256 | inserter->insert(temp); | |
3257 | this->expr_ = Expression::make_temporary_reference(temp, this->location()); | |
3258 | } | |
3259 | return this; | |
3260 | } | |
3261 | ||
1ca01a59 | 3262 | // Return whether a type conversion is a constant. |
3263 | ||
3264 | bool | |
3265 | Type_conversion_expression::do_is_constant() const | |
3266 | { | |
3267 | if (!this->expr_->is_constant()) | |
3268 | return false; | |
3269 | ||
3270 | // A conversion to a type that may not be used as a constant is not | |
3271 | // a constant. For example, []byte(nil). | |
3272 | Type* type = this->type_; | |
3273 | if (type->integer_type() == NULL | |
3274 | && type->float_type() == NULL | |
3275 | && type->complex_type() == NULL | |
3276 | && !type->is_boolean_type() | |
3277 | && !type->is_string_type()) | |
3278 | return false; | |
3279 | ||
3280 | return true; | |
3281 | } | |
3282 | ||
3ae06f68 | 3283 | // Return whether a type conversion can be used in a constant |
3284 | // initializer. | |
0e168074 | 3285 | |
3286 | bool | |
3ae06f68 | 3287 | Type_conversion_expression::do_is_static_initializer() const |
0e168074 | 3288 | { |
3289 | Type* type = this->type_; | |
3290 | Type* expr_type = this->expr_->type(); | |
3291 | ||
3292 | if (type->interface_type() != NULL | |
3293 | || expr_type->interface_type() != NULL) | |
3294 | return false; | |
3295 | ||
3ae06f68 | 3296 | if (!this->expr_->is_static_initializer()) |
0e168074 | 3297 | return false; |
3298 | ||
3299 | if (Type::are_identical(type, expr_type, false, NULL)) | |
3300 | return true; | |
3301 | ||
3302 | return type->is_basic_type() && expr_type->is_basic_type(); | |
3303 | } | |
3304 | ||
0c77715b | 3305 | // Return the constant numeric value if there is one. |
e440a328 | 3306 | |
3307 | bool | |
0c77715b | 3308 | Type_conversion_expression::do_numeric_constant_value( |
3309 | Numeric_constant* nc) const | |
e440a328 | 3310 | { |
0c77715b | 3311 | if (!this->type_->is_numeric_type()) |
e440a328 | 3312 | return false; |
0c77715b | 3313 | if (!this->expr_->numeric_constant_value(nc)) |
e440a328 | 3314 | return false; |
0c77715b | 3315 | return nc->set_type(this->type_, false, this->location()); |
e440a328 | 3316 | } |
3317 | ||
3318 | // Return the constant string value if there is one. | |
3319 | ||
3320 | bool | |
3321 | Type_conversion_expression::do_string_constant_value(std::string* val) const | |
3322 | { | |
3323 | if (this->type_->is_string_type() | |
3324 | && this->expr_->type()->integer_type() != NULL) | |
3325 | { | |
0c77715b | 3326 | Numeric_constant nc; |
3327 | if (this->expr_->numeric_constant_value(&nc)) | |
e440a328 | 3328 | { |
0c77715b | 3329 | unsigned long ival; |
3330 | if (nc.to_unsigned_long(&ival) == Numeric_constant::NC_UL_VALID) | |
e440a328 | 3331 | { |
0c77715b | 3332 | val->clear(); |
3333 | Lex::append_char(ival, true, val, this->location()); | |
e440a328 | 3334 | return true; |
3335 | } | |
3336 | } | |
e440a328 | 3337 | } |
3338 | ||
3339 | // FIXME: Could handle conversion from const []int here. | |
3340 | ||
3341 | return false; | |
3342 | } | |
3343 | ||
da244e59 | 3344 | // Determine the resulting type of the conversion. |
3345 | ||
3346 | void | |
3347 | Type_conversion_expression::do_determine_type(const Type_context*) | |
3348 | { | |
3349 | Type_context subcontext(this->type_, false); | |
3350 | this->expr_->determine_type(&subcontext); | |
3351 | } | |
3352 | ||
e440a328 | 3353 | // Check that types are convertible. |
3354 | ||
3355 | void | |
3356 | Type_conversion_expression::do_check_types(Gogo*) | |
3357 | { | |
3358 | Type* type = this->type_; | |
3359 | Type* expr_type = this->expr_->type(); | |
3360 | std::string reason; | |
3361 | ||
5c13bd80 | 3362 | if (type->is_error() || expr_type->is_error()) |
842f6425 | 3363 | { |
842f6425 | 3364 | this->set_is_error(); |
3365 | return; | |
3366 | } | |
3367 | ||
e440a328 | 3368 | if (this->may_convert_function_types_ |
3369 | && type->function_type() != NULL | |
3370 | && expr_type->function_type() != NULL) | |
3371 | return; | |
3372 | ||
3373 | if (Type::are_convertible(type, expr_type, &reason)) | |
3374 | return; | |
3375 | ||
631d5788 | 3376 | go_error_at(this->location(), "%s", reason.c_str()); |
e440a328 | 3377 | this->set_is_error(); |
3378 | } | |
3379 | ||
ea664253 | 3380 | // Get the backend representation for a type conversion. |
e440a328 | 3381 | |
ea664253 | 3382 | Bexpression* |
3383 | Type_conversion_expression::do_get_backend(Translate_context* context) | |
e440a328 | 3384 | { |
e440a328 | 3385 | Type* type = this->type_; |
3386 | Type* expr_type = this->expr_->type(); | |
2c809f8f | 3387 | |
3388 | Gogo* gogo = context->gogo(); | |
3389 | Btype* btype = type->get_backend(gogo); | |
ea664253 | 3390 | Bexpression* bexpr = this->expr_->get_backend(context); |
2c809f8f | 3391 | Location loc = this->location(); |
3392 | ||
3393 | if (Type::are_identical(type, expr_type, false, NULL)) | |
ea664253 | 3394 | return gogo->backend()->convert_expression(btype, bexpr, loc); |
2c809f8f | 3395 | else if (type->interface_type() != NULL |
3396 | || expr_type->interface_type() != NULL) | |
e440a328 | 3397 | { |
2c809f8f | 3398 | Expression* conversion = |
3399 | Expression::convert_for_assignment(gogo, type, this->expr_, | |
3400 | this->location()); | |
ea664253 | 3401 | return conversion->get_backend(context); |
e440a328 | 3402 | } |
3403 | else if (type->is_string_type() | |
3404 | && expr_type->integer_type() != NULL) | |
3405 | { | |
2c809f8f | 3406 | mpz_t intval; |
3407 | Numeric_constant nc; | |
3408 | if (this->expr_->numeric_constant_value(&nc) | |
3409 | && nc.to_int(&intval) | |
3410 | && mpz_fits_ushort_p(intval)) | |
e440a328 | 3411 | { |
e440a328 | 3412 | std::string s; |
2c809f8f | 3413 | Lex::append_char(mpz_get_ui(intval), true, &s, loc); |
3414 | mpz_clear(intval); | |
3415 | Expression* se = Expression::make_string(s, loc); | |
ea664253 | 3416 | return se->get_backend(context); |
e440a328 | 3417 | } |
3418 | ||
f16ab008 | 3419 | Expression* i2s_expr = |
736a16ba | 3420 | Runtime::make_call(Runtime::INTSTRING, loc, 2, |
3421 | Expression::make_nil(loc), this->expr_); | |
ea664253 | 3422 | return Expression::make_cast(type, i2s_expr, loc)->get_backend(context); |
e440a328 | 3423 | } |
55072f2b | 3424 | else if (type->is_string_type() && expr_type->is_slice_type()) |
e440a328 | 3425 | { |
55072f2b | 3426 | Array_type* a = expr_type->array_type(); |
e440a328 | 3427 | Type* e = a->element_type()->forwarded(); |
c484d925 | 3428 | go_assert(e->integer_type() != NULL); |
35a54f17 | 3429 | go_assert(this->expr_->is_variable()); |
3430 | ||
3431 | Runtime::Function code; | |
60963afd | 3432 | if (e->integer_type()->is_byte()) |
736a16ba | 3433 | code = Runtime::SLICEBYTETOSTRING; |
e440a328 | 3434 | else |
35a54f17 | 3435 | { |
3436 | go_assert(e->integer_type()->is_rune()); | |
736a16ba | 3437 | code = Runtime::SLICERUNETOSTRING; |
35a54f17 | 3438 | } |
736a16ba | 3439 | return Runtime::make_call(code, loc, 2, Expression::make_nil(loc), |
3440 | this->expr_)->get_backend(context); | |
e440a328 | 3441 | } |
411eb89e | 3442 | else if (type->is_slice_type() && expr_type->is_string_type()) |
e440a328 | 3443 | { |
3444 | Type* e = type->array_type()->element_type()->forwarded(); | |
c484d925 | 3445 | go_assert(e->integer_type() != NULL); |
6c252e42 | 3446 | |
2c809f8f | 3447 | Runtime::Function code; |
60963afd | 3448 | if (e->integer_type()->is_byte()) |
736a16ba | 3449 | code = Runtime::STRINGTOSLICEBYTE; |
e440a328 | 3450 | else |
3451 | { | |
60963afd | 3452 | go_assert(e->integer_type()->is_rune()); |
736a16ba | 3453 | code = Runtime::STRINGTOSLICERUNE; |
e440a328 | 3454 | } |
736a16ba | 3455 | Expression* s2a = Runtime::make_call(code, loc, 2, |
3456 | Expression::make_nil(loc), | |
3457 | this->expr_); | |
ea664253 | 3458 | return Expression::make_unsafe_cast(type, s2a, loc)->get_backend(context); |
2c809f8f | 3459 | } |
3460 | else if (type->is_numeric_type()) | |
3461 | { | |
3462 | go_assert(Type::are_convertible(type, expr_type, NULL)); | |
ea664253 | 3463 | return gogo->backend()->convert_expression(btype, bexpr, loc); |
e440a328 | 3464 | } |
3465 | else if ((type->is_unsafe_pointer_type() | |
2c809f8f | 3466 | && (expr_type->points_to() != NULL |
3467 | || expr_type->integer_type())) | |
3468 | || (expr_type->is_unsafe_pointer_type() | |
3469 | && type->points_to() != NULL) | |
3470 | || (this->may_convert_function_types_ | |
3471 | && type->function_type() != NULL | |
3472 | && expr_type->function_type() != NULL)) | |
ea664253 | 3473 | return gogo->backend()->convert_expression(btype, bexpr, loc); |
e440a328 | 3474 | else |
2c809f8f | 3475 | { |
3476 | Expression* conversion = | |
3477 | Expression::convert_for_assignment(gogo, type, this->expr_, loc); | |
ea664253 | 3478 | return conversion->get_backend(context); |
2c809f8f | 3479 | } |
e440a328 | 3480 | } |
3481 | ||
3482 | // Output a type conversion in a constant expression. | |
3483 | ||
3484 | void | |
3485 | Type_conversion_expression::do_export(Export* exp) const | |
3486 | { | |
3487 | exp->write_c_string("convert("); | |
3488 | exp->write_type(this->type_); | |
3489 | exp->write_c_string(", "); | |
3490 | this->expr_->export_expression(exp); | |
3491 | exp->write_c_string(")"); | |
3492 | } | |
3493 | ||
3494 | // Import a type conversion or a struct construction. | |
3495 | ||
3496 | Expression* | |
3497 | Type_conversion_expression::do_import(Import* imp) | |
3498 | { | |
3499 | imp->require_c_string("convert("); | |
3500 | Type* type = imp->read_type(); | |
3501 | imp->require_c_string(", "); | |
3502 | Expression* val = Expression::import_expression(imp); | |
3503 | imp->require_c_string(")"); | |
3504 | return Expression::make_cast(type, val, imp->location()); | |
3505 | } | |
3506 | ||
d751bb78 | 3507 | // Dump ast representation for a type conversion expression. |
3508 | ||
3509 | void | |
3510 | Type_conversion_expression::do_dump_expression( | |
3511 | Ast_dump_context* ast_dump_context) const | |
3512 | { | |
3513 | ast_dump_context->dump_type(this->type_); | |
3514 | ast_dump_context->ostream() << "("; | |
3515 | ast_dump_context->dump_expression(this->expr_); | |
3516 | ast_dump_context->ostream() << ") "; | |
3517 | } | |
3518 | ||
e440a328 | 3519 | // Make a type cast expression. |
3520 | ||
3521 | Expression* | |
b13c66cd | 3522 | Expression::make_cast(Type* type, Expression* val, Location location) |
e440a328 | 3523 | { |
3524 | if (type->is_error_type() || val->is_error_expression()) | |
3525 | return Expression::make_error(location); | |
3526 | return new Type_conversion_expression(type, val, location); | |
3527 | } | |
3528 | ||
98f62f7a | 3529 | // Class Unsafe_type_conversion_expression. |
9581e91d | 3530 | |
3531 | // Traversal. | |
3532 | ||
3533 | int | |
3534 | Unsafe_type_conversion_expression::do_traverse(Traverse* traverse) | |
3535 | { | |
3536 | if (Expression::traverse(&this->expr_, traverse) == TRAVERSE_EXIT | |
3537 | || Type::traverse(this->type_, traverse) == TRAVERSE_EXIT) | |
3538 | return TRAVERSE_EXIT; | |
3539 | return TRAVERSE_CONTINUE; | |
3540 | } | |
3541 | ||
3ae06f68 | 3542 | // Return whether an unsafe type conversion can be used as a constant |
3543 | // initializer. | |
aa5ae575 | 3544 | |
3545 | bool | |
3ae06f68 | 3546 | Unsafe_type_conversion_expression::do_is_static_initializer() const |
aa5ae575 | 3547 | { |
3548 | Type* type = this->type_; | |
3549 | Type* expr_type = this->expr_->type(); | |
3550 | ||
3551 | if (type->interface_type() != NULL | |
3552 | || expr_type->interface_type() != NULL) | |
3553 | return false; | |
3554 | ||
3ae06f68 | 3555 | if (!this->expr_->is_static_initializer()) |
aa5ae575 | 3556 | return false; |
3557 | ||
3558 | if (Type::are_convertible(type, expr_type, NULL)) | |
3559 | return true; | |
3560 | ||
3561 | return type->is_basic_type() && expr_type->is_basic_type(); | |
3562 | } | |
3563 | ||
9581e91d | 3564 | // Convert to backend representation. |
3565 | ||
ea664253 | 3566 | Bexpression* |
3567 | Unsafe_type_conversion_expression::do_get_backend(Translate_context* context) | |
9581e91d | 3568 | { |
3569 | // We are only called for a limited number of cases. | |
3570 | ||
3571 | Type* t = this->type_; | |
3572 | Type* et = this->expr_->type(); | |
5c4802f1 | 3573 | |
3574 | if (t->is_error_type() | |
3575 | || this->expr_->is_error_expression() | |
3576 | || et->is_error_type()) | |
3577 | { | |
3578 | go_assert(saw_errors()); | |
3579 | return context->backend()->error_expression(); | |
3580 | } | |
3581 | ||
2c809f8f | 3582 | if (t->array_type() != NULL) |
3583 | go_assert(et->array_type() != NULL | |
3584 | && t->is_slice_type() == et->is_slice_type()); | |
3585 | else if (t->struct_type() != NULL) | |
9581e91d | 3586 | { |
2c809f8f | 3587 | if (t->named_type() != NULL |
3588 | && et->named_type() != NULL | |
3589 | && !Type::are_convertible(t, et, NULL)) | |
3590 | { | |
3591 | go_assert(saw_errors()); | |
ea664253 | 3592 | return context->backend()->error_expression(); |
2c809f8f | 3593 | } |
3594 | ||
3595 | go_assert(et->struct_type() != NULL | |
3596 | && Type::are_convertible(t, et, NULL)); | |
3597 | } | |
3598 | else if (t->map_type() != NULL) | |
c484d925 | 3599 | go_assert(et->map_type() != NULL); |
9581e91d | 3600 | else if (t->channel_type() != NULL) |
c484d925 | 3601 | go_assert(et->channel_type() != NULL); |
09ea332d | 3602 | else if (t->points_to() != NULL) |
2c809f8f | 3603 | go_assert(et->points_to() != NULL |
3604 | || et->channel_type() != NULL | |
3605 | || et->map_type() != NULL | |
3606 | || et->function_type() != NULL | |
132ed071 | 3607 | || et->integer_type() != NULL |
2c809f8f | 3608 | || et->is_nil_type()); |
9581e91d | 3609 | else if (et->is_unsafe_pointer_type()) |
c484d925 | 3610 | go_assert(t->points_to() != NULL); |
2c809f8f | 3611 | else if (t->interface_type() != NULL) |
9581e91d | 3612 | { |
2c809f8f | 3613 | bool empty_iface = t->interface_type()->is_empty(); |
c484d925 | 3614 | go_assert(et->interface_type() != NULL |
2c809f8f | 3615 | && et->interface_type()->is_empty() == empty_iface); |
9581e91d | 3616 | } |
588e3cf9 | 3617 | else if (t->integer_type() != NULL) |
2c809f8f | 3618 | go_assert(et->is_boolean_type() |
3619 | || et->integer_type() != NULL | |
3620 | || et->function_type() != NULL | |
3621 | || et->points_to() != NULL | |
3622 | || et->map_type() != NULL | |
8ba8cc87 | 3623 | || et->channel_type() != NULL |
3624 | || et->is_nil_type()); | |
cd39797e | 3625 | else if (t->function_type() != NULL) |
3626 | go_assert(et->points_to() != NULL); | |
9581e91d | 3627 | else |
c3e6f413 | 3628 | go_unreachable(); |
9581e91d | 3629 | |
2c809f8f | 3630 | Gogo* gogo = context->gogo(); |
3631 | Btype* btype = t->get_backend(gogo); | |
ea664253 | 3632 | Bexpression* bexpr = this->expr_->get_backend(context); |
2c809f8f | 3633 | Location loc = this->location(); |
ea664253 | 3634 | return gogo->backend()->convert_expression(btype, bexpr, loc); |
9581e91d | 3635 | } |
3636 | ||
d751bb78 | 3637 | // Dump ast representation for an unsafe type conversion expression. |
3638 | ||
3639 | void | |
3640 | Unsafe_type_conversion_expression::do_dump_expression( | |
3641 | Ast_dump_context* ast_dump_context) const | |
3642 | { | |
3643 | ast_dump_context->dump_type(this->type_); | |
3644 | ast_dump_context->ostream() << "("; | |
3645 | ast_dump_context->dump_expression(this->expr_); | |
3646 | ast_dump_context->ostream() << ") "; | |
3647 | } | |
3648 | ||
9581e91d | 3649 | // Make an unsafe type conversion expression. |
3650 | ||
3651 | Expression* | |
3652 | Expression::make_unsafe_cast(Type* type, Expression* expr, | |
b13c66cd | 3653 | Location location) |
9581e91d | 3654 | { |
3655 | return new Unsafe_type_conversion_expression(type, expr, location); | |
3656 | } | |
3657 | ||
76f85fd6 | 3658 | // Class Unary_expression. |
e440a328 | 3659 | |
3660 | // If we are taking the address of a composite literal, and the | |
2c809f8f | 3661 | // contents are not constant, then we want to make a heap expression |
e440a328 | 3662 | // instead. |
3663 | ||
3664 | Expression* | |
ceeb4318 | 3665 | Unary_expression::do_lower(Gogo*, Named_object*, Statement_inserter*, int) |
e440a328 | 3666 | { |
b13c66cd | 3667 | Location loc = this->location(); |
e440a328 | 3668 | Operator op = this->op_; |
3669 | Expression* expr = this->expr_; | |
3670 | ||
3671 | if (op == OPERATOR_MULT && expr->is_type_expression()) | |
3672 | return Expression::make_type(Type::make_pointer_type(expr->type()), loc); | |
3673 | ||
3674 | // *&x simplifies to x. *(*T)(unsafe.Pointer)(&x) does not require | |
3675 | // moving x to the heap. FIXME: Is it worth doing a real escape | |
3676 | // analysis here? This case is found in math/unsafe.go and is | |
3677 | // therefore worth special casing. | |
3678 | if (op == OPERATOR_MULT) | |
3679 | { | |
3680 | Expression* e = expr; | |
3681 | while (e->classification() == EXPRESSION_CONVERSION) | |
3682 | { | |
3683 | Type_conversion_expression* te | |
3684 | = static_cast<Type_conversion_expression*>(e); | |
3685 | e = te->expr(); | |
3686 | } | |
3687 | ||
3688 | if (e->classification() == EXPRESSION_UNARY) | |
3689 | { | |
3690 | Unary_expression* ue = static_cast<Unary_expression*>(e); | |
3691 | if (ue->op_ == OPERATOR_AND) | |
3692 | { | |
3693 | if (e == expr) | |
3694 | { | |
3695 | // *&x == x. | |
f4dea966 | 3696 | if (!ue->expr_->is_addressable() && !ue->create_temp_) |
3697 | { | |
631d5788 | 3698 | go_error_at(ue->location(), |
3699 | "invalid operand for unary %<&%>"); | |
f4dea966 | 3700 | this->set_is_error(); |
3701 | } | |
e440a328 | 3702 | return ue->expr_; |
3703 | } | |
3704 | ue->set_does_not_escape(); | |
3705 | } | |
3706 | } | |
3707 | } | |
3708 | ||
55661ce9 | 3709 | // Catching an invalid indirection of unsafe.Pointer here avoid |
3710 | // having to deal with TYPE_VOID in other places. | |
3711 | if (op == OPERATOR_MULT && expr->type()->is_unsafe_pointer_type()) | |
3712 | { | |
631d5788 | 3713 | go_error_at(this->location(), "invalid indirect of %<unsafe.Pointer%>"); |
55661ce9 | 3714 | return Expression::make_error(this->location()); |
3715 | } | |
3716 | ||
d9f3743a | 3717 | // Check for an invalid pointer dereference. We need to do this |
3718 | // here because Unary_expression::do_type will return an error type | |
3719 | // in this case. That can cause code to appear erroneous, and | |
3720 | // therefore disappear at lowering time, without any error message. | |
3721 | if (op == OPERATOR_MULT && expr->type()->points_to() == NULL) | |
3722 | { | |
3723 | this->report_error(_("expected pointer")); | |
3724 | return Expression::make_error(this->location()); | |
3725 | } | |
3726 | ||
59a401fe | 3727 | if (op == OPERATOR_PLUS || op == OPERATOR_MINUS || op == OPERATOR_XOR) |
e440a328 | 3728 | { |
0c77715b | 3729 | Numeric_constant nc; |
3730 | if (expr->numeric_constant_value(&nc)) | |
e440a328 | 3731 | { |
0c77715b | 3732 | Numeric_constant result; |
3733 | if (Unary_expression::eval_constant(op, &nc, loc, &result)) | |
3734 | return result.expression(loc); | |
e440a328 | 3735 | } |
3736 | } | |
3737 | ||
3738 | return this; | |
3739 | } | |
3740 | ||
f9ca30f9 | 3741 | // Flatten expression if a nil check must be performed and create temporary |
3742 | // variables if necessary. | |
3743 | ||
3744 | Expression* | |
3745 | Unary_expression::do_flatten(Gogo* gogo, Named_object*, | |
3746 | Statement_inserter* inserter) | |
3747 | { | |
5bf8be8b | 3748 | if (this->is_error_expression() |
3749 | || this->expr_->is_error_expression() | |
3750 | || this->expr_->type()->is_error_type()) | |
3751 | { | |
3752 | go_assert(saw_errors()); | |
3753 | return Expression::make_error(this->location()); | |
3754 | } | |
f4dea966 | 3755 | |
f9ca30f9 | 3756 | Location location = this->location(); |
3757 | if (this->op_ == OPERATOR_MULT | |
3758 | && !this->expr_->is_variable()) | |
3759 | { | |
3760 | go_assert(this->expr_->type()->points_to() != NULL); | |
3761 | Type* ptype = this->expr_->type()->points_to(); | |
3762 | if (!ptype->is_void_type()) | |
3763 | { | |
2a305b85 | 3764 | int64_t s; |
3765 | bool ok = ptype->backend_type_size(gogo, &s); | |
3766 | if (!ok) | |
3767 | { | |
3768 | go_assert(saw_errors()); | |
3769 | return Expression::make_error(this->location()); | |
3770 | } | |
f9ca30f9 | 3771 | if (s >= 4096 || this->issue_nil_check_) |
3772 | { | |
3773 | Temporary_statement* temp = | |
3774 | Statement::make_temporary(NULL, this->expr_, location); | |
3775 | inserter->insert(temp); | |
3776 | this->expr_ = | |
3777 | Expression::make_temporary_reference(temp, location); | |
3778 | } | |
3779 | } | |
3780 | } | |
3781 | ||
da244e59 | 3782 | if (this->op_ == OPERATOR_AND) |
3783 | { | |
8ff995b5 | 3784 | // If this->escapes_ is false at this point, then it was set to |
3785 | // false by an explicit call to set_does_not_escape, and the | |
3786 | // value does not escape. If this->escapes_ is true, we may be | |
3787 | // able to set it to false if taking the address of a variable | |
3788 | // that does not escape. | |
45ff893b | 3789 | Node* n = Node::make_node(this); |
3790 | if ((n->encoding() & ESCAPE_MASK) == int(Node::ESCAPE_NONE)) | |
3791 | this->escapes_ = false; | |
3792 | ||
0dad6de4 | 3793 | // When compiling the runtime, the address operator does not |
87211034 | 3794 | // cause local variables to escape. When escape analysis |
0dad6de4 | 3795 | // becomes the default, this should be changed to make it an |
3796 | // error if we have an address operator that escapes. | |
3797 | if (gogo->compiling_runtime() && gogo->package_name() == "runtime") | |
3798 | this->escapes_ = false; | |
3799 | ||
45ff893b | 3800 | Named_object* var = NULL; |
3801 | if (this->expr_->var_expression() != NULL) | |
3802 | var = this->expr_->var_expression()->named_object(); | |
3803 | else if (this->expr_->enclosed_var_expression() != NULL) | |
3804 | var = this->expr_->enclosed_var_expression()->variable(); | |
3805 | ||
3806 | if (this->escapes_ && var != NULL) | |
da244e59 | 3807 | { |
da244e59 | 3808 | if (var->is_variable()) |
3809 | this->escapes_ = var->var_value()->escapes(); | |
3810 | if (var->is_result_variable()) | |
3811 | this->escapes_ = var->result_var_value()->escapes(); | |
3812 | } | |
3813 | this->expr_->address_taken(this->escapes_); | |
3814 | } | |
3815 | ||
f9ca30f9 | 3816 | if (this->create_temp_ && !this->expr_->is_variable()) |
3817 | { | |
3818 | Temporary_statement* temp = | |
3819 | Statement::make_temporary(NULL, this->expr_, location); | |
3820 | inserter->insert(temp); | |
3821 | this->expr_ = Expression::make_temporary_reference(temp, location); | |
3822 | } | |
3823 | ||
3824 | return this; | |
3825 | } | |
3826 | ||
e440a328 | 3827 | // Return whether a unary expression is a constant. |
3828 | ||
3829 | bool | |
3830 | Unary_expression::do_is_constant() const | |
3831 | { | |
3832 | if (this->op_ == OPERATOR_MULT) | |
3833 | { | |
3834 | // Indirecting through a pointer is only constant if the object | |
3835 | // to which the expression points is constant, but we currently | |
3836 | // have no way to determine that. | |
3837 | return false; | |
3838 | } | |
3839 | else if (this->op_ == OPERATOR_AND) | |
3840 | { | |
3841 | // Taking the address of a variable is constant if it is a | |
f9ca30f9 | 3842 | // global variable, not constant otherwise. In other cases taking the |
3843 | // address is probably not a constant. | |
e440a328 | 3844 | Var_expression* ve = this->expr_->var_expression(); |
3845 | if (ve != NULL) | |
3846 | { | |
3847 | Named_object* no = ve->named_object(); | |
3848 | return no->is_variable() && no->var_value()->is_global(); | |
3849 | } | |
3850 | return false; | |
3851 | } | |
3852 | else | |
3853 | return this->expr_->is_constant(); | |
3854 | } | |
3855 | ||
3ae06f68 | 3856 | // Return whether a unary expression can be used as a constant |
3857 | // initializer. | |
3858 | ||
3859 | bool | |
3860 | Unary_expression::do_is_static_initializer() const | |
3861 | { | |
3862 | if (this->op_ == OPERATOR_MULT) | |
3863 | return false; | |
3864 | else if (this->op_ == OPERATOR_AND) | |
3865 | { | |
3866 | // The address of a global variable can used as a static | |
3867 | // initializer. | |
3868 | Var_expression* ve = this->expr_->var_expression(); | |
3869 | if (ve != NULL) | |
3870 | { | |
3871 | Named_object* no = ve->named_object(); | |
3872 | return no->is_variable() && no->var_value()->is_global(); | |
3873 | } | |
3874 | ||
3875 | // The address of a composite literal can be used as a static | |
3876 | // initializer if the composite literal is itself usable as a | |
3877 | // static initializer. | |
3878 | if (this->expr_->is_composite_literal() | |
3879 | && this->expr_->is_static_initializer()) | |
3880 | return true; | |
3881 | ||
3882 | // The address of a string constant can be used as a static | |
3883 | // initializer. This can not be written in Go itself but this | |
3884 | // is used when building a type descriptor. | |
3885 | if (this->expr_->string_expression() != NULL) | |
3886 | return true; | |
3887 | ||
3888 | return false; | |
3889 | } | |
3890 | else | |
3891 | return this->expr_->is_static_initializer(); | |
3892 | } | |
3893 | ||
0c77715b | 3894 | // Apply unary opcode OP to UNC, setting NC. Return true if this |
3895 | // could be done, false if not. Issue errors for overflow. | |
e440a328 | 3896 | |
3897 | bool | |
0c77715b | 3898 | Unary_expression::eval_constant(Operator op, const Numeric_constant* unc, |
3899 | Location location, Numeric_constant* nc) | |
e440a328 | 3900 | { |
3901 | switch (op) | |
3902 | { | |
3903 | case OPERATOR_PLUS: | |
0c77715b | 3904 | *nc = *unc; |
e440a328 | 3905 | return true; |
0c77715b | 3906 | |
e440a328 | 3907 | case OPERATOR_MINUS: |
0c77715b | 3908 | if (unc->is_int() || unc->is_rune()) |
3909 | break; | |
3910 | else if (unc->is_float()) | |
3911 | { | |
3912 | mpfr_t uval; | |
3913 | unc->get_float(&uval); | |
3914 | mpfr_t val; | |
3915 | mpfr_init(val); | |
3916 | mpfr_neg(val, uval, GMP_RNDN); | |
3917 | nc->set_float(unc->type(), val); | |
3918 | mpfr_clear(uval); | |
3919 | mpfr_clear(val); | |
3920 | return true; | |
3921 | } | |
3922 | else if (unc->is_complex()) | |
3923 | { | |
fcbea5e4 | 3924 | mpc_t uval; |
3925 | unc->get_complex(&uval); | |
3926 | mpc_t val; | |
3927 | mpc_init2(val, mpc_precision); | |
3928 | mpc_neg(val, uval, MPC_RNDNN); | |
3929 | nc->set_complex(unc->type(), val); | |
3930 | mpc_clear(uval); | |
3931 | mpc_clear(val); | |
0c77715b | 3932 | return true; |
3933 | } | |
e440a328 | 3934 | else |
0c77715b | 3935 | go_unreachable(); |
e440a328 | 3936 | |
0c77715b | 3937 | case OPERATOR_XOR: |
3938 | break; | |
68448d53 | 3939 | |
59a401fe | 3940 | case OPERATOR_NOT: |
e440a328 | 3941 | case OPERATOR_AND: |
3942 | case OPERATOR_MULT: | |
3943 | return false; | |
0c77715b | 3944 | |
e440a328 | 3945 | default: |
c3e6f413 | 3946 | go_unreachable(); |
e440a328 | 3947 | } |
e440a328 | 3948 | |
0c77715b | 3949 | if (!unc->is_int() && !unc->is_rune()) |
3950 | return false; | |
3951 | ||
3952 | mpz_t uval; | |
8387e1df | 3953 | if (unc->is_rune()) |
3954 | unc->get_rune(&uval); | |
3955 | else | |
3956 | unc->get_int(&uval); | |
0c77715b | 3957 | mpz_t val; |
3958 | mpz_init(val); | |
e440a328 | 3959 | |
e440a328 | 3960 | switch (op) |
3961 | { | |
e440a328 | 3962 | case OPERATOR_MINUS: |
0c77715b | 3963 | mpz_neg(val, uval); |
3964 | break; | |
3965 | ||
e440a328 | 3966 | case OPERATOR_NOT: |
0c77715b | 3967 | mpz_set_ui(val, mpz_cmp_si(uval, 0) == 0 ? 1 : 0); |
3968 | break; | |
3969 | ||
e440a328 | 3970 | case OPERATOR_XOR: |
0c77715b | 3971 | { |
3972 | Type* utype = unc->type(); | |
3973 | if (utype->integer_type() == NULL | |
3974 | || utype->integer_type()->is_abstract()) | |
3975 | mpz_com(val, uval); | |
3976 | else | |
3977 | { | |
3978 | // The number of HOST_WIDE_INTs that it takes to represent | |
3979 | // UVAL. | |
3980 | size_t count = ((mpz_sizeinbase(uval, 2) | |
3981 | + HOST_BITS_PER_WIDE_INT | |
3982 | - 1) | |
3983 | / HOST_BITS_PER_WIDE_INT); | |
e440a328 | 3984 | |
0c77715b | 3985 | unsigned HOST_WIDE_INT* phwi = new unsigned HOST_WIDE_INT[count]; |
3986 | memset(phwi, 0, count * sizeof(HOST_WIDE_INT)); | |
3987 | ||
3988 | size_t obits = utype->integer_type()->bits(); | |
3989 | ||
3990 | if (!utype->integer_type()->is_unsigned() && mpz_sgn(uval) < 0) | |
3991 | { | |
3992 | mpz_t adj; | |
3993 | mpz_init_set_ui(adj, 1); | |
3994 | mpz_mul_2exp(adj, adj, obits); | |
3995 | mpz_add(uval, uval, adj); | |
3996 | mpz_clear(adj); | |
3997 | } | |
3998 | ||
3999 | size_t ecount; | |
4000 | mpz_export(phwi, &ecount, -1, sizeof(HOST_WIDE_INT), 0, 0, uval); | |
4001 | go_assert(ecount <= count); | |
4002 | ||
4003 | // Trim down to the number of words required by the type. | |
4004 | size_t ocount = ((obits + HOST_BITS_PER_WIDE_INT - 1) | |
4005 | / HOST_BITS_PER_WIDE_INT); | |
4006 | go_assert(ocount <= count); | |
4007 | ||
4008 | for (size_t i = 0; i < ocount; ++i) | |
4009 | phwi[i] = ~phwi[i]; | |
4010 | ||
4011 | size_t clearbits = ocount * HOST_BITS_PER_WIDE_INT - obits; | |
4012 | if (clearbits != 0) | |
4013 | phwi[ocount - 1] &= (((unsigned HOST_WIDE_INT) (HOST_WIDE_INT) -1) | |
4014 | >> clearbits); | |
4015 | ||
4016 | mpz_import(val, ocount, -1, sizeof(HOST_WIDE_INT), 0, 0, phwi); | |
4017 | ||
4018 | if (!utype->integer_type()->is_unsigned() | |
4019 | && mpz_tstbit(val, obits - 1)) | |
4020 | { | |
4021 | mpz_t adj; | |
4022 | mpz_init_set_ui(adj, 1); | |
4023 | mpz_mul_2exp(adj, adj, obits); | |
4024 | mpz_sub(val, val, adj); | |
4025 | mpz_clear(adj); | |
4026 | } | |
4027 | ||
4028 | delete[] phwi; | |
4029 | } | |
4030 | } | |
4031 | break; | |
e440a328 | 4032 | |
e440a328 | 4033 | default: |
c3e6f413 | 4034 | go_unreachable(); |
e440a328 | 4035 | } |
e440a328 | 4036 | |
0c77715b | 4037 | if (unc->is_rune()) |
4038 | nc->set_rune(NULL, val); | |
e440a328 | 4039 | else |
0c77715b | 4040 | nc->set_int(NULL, val); |
e440a328 | 4041 | |
0c77715b | 4042 | mpz_clear(uval); |
4043 | mpz_clear(val); | |
e440a328 | 4044 | |
0c77715b | 4045 | return nc->set_type(unc->type(), true, location); |
e440a328 | 4046 | } |
4047 | ||
0c77715b | 4048 | // Return the integral constant value of a unary expression, if it has one. |
e440a328 | 4049 | |
4050 | bool | |
0c77715b | 4051 | Unary_expression::do_numeric_constant_value(Numeric_constant* nc) const |
e440a328 | 4052 | { |
0c77715b | 4053 | Numeric_constant unc; |
4054 | if (!this->expr_->numeric_constant_value(&unc)) | |
4055 | return false; | |
4056 | return Unary_expression::eval_constant(this->op_, &unc, this->location(), | |
4057 | nc); | |
e440a328 | 4058 | } |
4059 | ||
4060 | // Return the type of a unary expression. | |
4061 | ||
4062 | Type* | |
4063 | Unary_expression::do_type() | |
4064 | { | |
4065 | switch (this->op_) | |
4066 | { | |
4067 | case OPERATOR_PLUS: | |
4068 | case OPERATOR_MINUS: | |
4069 | case OPERATOR_NOT: | |
4070 | case OPERATOR_XOR: | |
4071 | return this->expr_->type(); | |
4072 | ||
4073 | case OPERATOR_AND: | |
4074 | return Type::make_pointer_type(this->expr_->type()); | |
4075 | ||
4076 | case OPERATOR_MULT: | |
4077 | { | |
4078 | Type* subtype = this->expr_->type(); | |
4079 | Type* points_to = subtype->points_to(); | |
4080 | if (points_to == NULL) | |
4081 | return Type::make_error_type(); | |
4082 | return points_to; | |
4083 | } | |
4084 | ||
4085 | default: | |
c3e6f413 | 4086 | go_unreachable(); |
e440a328 | 4087 | } |
4088 | } | |
4089 | ||
4090 | // Determine abstract types for a unary expression. | |
4091 | ||
4092 | void | |
4093 | Unary_expression::do_determine_type(const Type_context* context) | |
4094 | { | |
4095 | switch (this->op_) | |
4096 | { | |
4097 | case OPERATOR_PLUS: | |
4098 | case OPERATOR_MINUS: | |
4099 | case OPERATOR_NOT: | |
4100 | case OPERATOR_XOR: | |
4101 | this->expr_->determine_type(context); | |
4102 | break; | |
4103 | ||
4104 | case OPERATOR_AND: | |
4105 | // Taking the address of something. | |
4106 | { | |
4107 | Type* subtype = (context->type == NULL | |
4108 | ? NULL | |
4109 | : context->type->points_to()); | |
4110 | Type_context subcontext(subtype, false); | |
4111 | this->expr_->determine_type(&subcontext); | |
4112 | } | |
4113 | break; | |
4114 | ||
4115 | case OPERATOR_MULT: | |
4116 | // Indirecting through a pointer. | |
4117 | { | |
4118 | Type* subtype = (context->type == NULL | |
4119 | ? NULL | |
4120 | : Type::make_pointer_type(context->type)); | |
4121 | Type_context subcontext(subtype, false); | |
4122 | this->expr_->determine_type(&subcontext); | |
4123 | } | |
4124 | break; | |
4125 | ||
4126 | default: | |
c3e6f413 | 4127 | go_unreachable(); |
e440a328 | 4128 | } |
4129 | } | |
4130 | ||
4131 | // Check types for a unary expression. | |
4132 | ||
4133 | void | |
4134 | Unary_expression::do_check_types(Gogo*) | |
4135 | { | |
9fe897ef | 4136 | Type* type = this->expr_->type(); |
5c13bd80 | 4137 | if (type->is_error()) |
9fe897ef | 4138 | { |
4139 | this->set_is_error(); | |
4140 | return; | |
4141 | } | |
4142 | ||
e440a328 | 4143 | switch (this->op_) |
4144 | { | |
4145 | case OPERATOR_PLUS: | |
4146 | case OPERATOR_MINUS: | |
9fe897ef | 4147 | if (type->integer_type() == NULL |
4148 | && type->float_type() == NULL | |
4149 | && type->complex_type() == NULL) | |
4150 | this->report_error(_("expected numeric type")); | |
e440a328 | 4151 | break; |
4152 | ||
4153 | case OPERATOR_NOT: | |
59a401fe | 4154 | if (!type->is_boolean_type()) |
4155 | this->report_error(_("expected boolean type")); | |
4156 | break; | |
4157 | ||
e440a328 | 4158 | case OPERATOR_XOR: |
b3b1474e | 4159 | if (type->integer_type() == NULL) |
4160 | this->report_error(_("expected integer")); | |
e440a328 | 4161 | break; |
4162 | ||
4163 | case OPERATOR_AND: | |
4164 | if (!this->expr_->is_addressable()) | |
09ea332d | 4165 | { |
4166 | if (!this->create_temp_) | |
f4dea966 | 4167 | { |
631d5788 | 4168 | go_error_at(this->location(), "invalid operand for unary %<&%>"); |
f4dea966 | 4169 | this->set_is_error(); |
4170 | } | |
09ea332d | 4171 | } |
e440a328 | 4172 | else |
da244e59 | 4173 | this->expr_->issue_nil_check(); |
e440a328 | 4174 | break; |
4175 | ||
4176 | case OPERATOR_MULT: | |
4177 | // Indirecting through a pointer. | |
9fe897ef | 4178 | if (type->points_to() == NULL) |
4179 | this->report_error(_("expected pointer")); | |
7661d702 | 4180 | if (type->points_to()->is_error()) |
4181 | this->set_is_error(); | |
e440a328 | 4182 | break; |
4183 | ||
4184 | default: | |
c3e6f413 | 4185 | go_unreachable(); |
e440a328 | 4186 | } |
4187 | } | |
4188 | ||
ea664253 | 4189 | // Get the backend representation for a unary expression. |
e440a328 | 4190 | |
ea664253 | 4191 | Bexpression* |
4192 | Unary_expression::do_get_backend(Translate_context* context) | |
e440a328 | 4193 | { |
1b1f2abf | 4194 | Gogo* gogo = context->gogo(); |
e9d3367e | 4195 | Location loc = this->location(); |
4196 | ||
4197 | // Taking the address of a set-and-use-temporary expression requires | |
4198 | // setting the temporary and then taking the address. | |
4199 | if (this->op_ == OPERATOR_AND) | |
4200 | { | |
4201 | Set_and_use_temporary_expression* sut = | |
4202 | this->expr_->set_and_use_temporary_expression(); | |
4203 | if (sut != NULL) | |
4204 | { | |
4205 | Temporary_statement* temp = sut->temporary(); | |
4206 | Bvariable* bvar = temp->get_backend_variable(context); | |
f9ca30f9 | 4207 | Bexpression* bvar_expr = gogo->backend()->var_expression(bvar, loc); |
ea664253 | 4208 | Bexpression* bval = sut->expression()->get_backend(context); |
f9ca30f9 | 4209 | |
4210 | Bstatement* bassign = | |
4211 | gogo->backend()->assignment_statement(bvar_expr, bval, loc); | |
4212 | Bexpression* bvar_addr = | |
4213 | gogo->backend()->address_expression(bvar_expr, loc); | |
ea664253 | 4214 | return gogo->backend()->compound_expression(bassign, bvar_addr, loc); |
e9d3367e | 4215 | } |
4216 | } | |
4217 | ||
f9ca30f9 | 4218 | Bexpression* ret; |
ea664253 | 4219 | Bexpression* bexpr = this->expr_->get_backend(context); |
f9ca30f9 | 4220 | Btype* btype = this->expr_->type()->get_backend(gogo); |
e440a328 | 4221 | switch (this->op_) |
4222 | { | |
4223 | case OPERATOR_PLUS: | |
f9ca30f9 | 4224 | ret = bexpr; |
4225 | break; | |
e440a328 | 4226 | |
4227 | case OPERATOR_MINUS: | |
f9ca30f9 | 4228 | ret = gogo->backend()->unary_expression(this->op_, bexpr, loc); |
4229 | ret = gogo->backend()->convert_expression(btype, ret, loc); | |
4230 | break; | |
e440a328 | 4231 | |
4232 | case OPERATOR_NOT: | |
e440a328 | 4233 | case OPERATOR_XOR: |
f9ca30f9 | 4234 | ret = gogo->backend()->unary_expression(this->op_, bexpr, loc); |
4235 | break; | |
e440a328 | 4236 | |
4237 | case OPERATOR_AND: | |
09ea332d | 4238 | if (!this->create_temp_) |
4239 | { | |
4240 | // We should not see a non-constant constructor here; cases | |
4241 | // where we would see one should have been moved onto the | |
4242 | // heap at parse time. Taking the address of a nonconstant | |
4243 | // constructor will not do what the programmer expects. | |
f9ca30f9 | 4244 | |
4245 | go_assert(!this->expr_->is_composite_literal() | |
3ae06f68 | 4246 | || this->expr_->is_static_initializer()); |
24060bf9 | 4247 | if (this->expr_->classification() == EXPRESSION_UNARY) |
4248 | { | |
4249 | Unary_expression* ue = | |
4250 | static_cast<Unary_expression*>(this->expr_); | |
4251 | go_assert(ue->op() != OPERATOR_AND); | |
4252 | } | |
09ea332d | 4253 | } |
e440a328 | 4254 | |
f23d7786 | 4255 | static unsigned int counter; |
4256 | char buf[100]; | |
4257 | if (this->is_gc_root_ || this->is_slice_init_) | |
76f85fd6 | 4258 | { |
f23d7786 | 4259 | bool copy_to_heap = false; |
4260 | if (this->is_gc_root_) | |
4261 | { | |
4262 | // Build a decl for a GC root variable. GC roots are mutable, so | |
4263 | // they cannot be represented as an immutable_struct in the | |
4264 | // backend. | |
4265 | static unsigned int root_counter; | |
4266 | snprintf(buf, sizeof buf, "gc%u", root_counter); | |
4267 | ++root_counter; | |
4268 | } | |
4269 | else | |
4270 | { | |
4271 | // Build a decl for a slice value initializer. An immutable slice | |
4272 | // value initializer may have to be copied to the heap if it | |
4273 | // contains pointers in a non-constant context. | |
4274 | snprintf(buf, sizeof buf, "C%u", counter); | |
4275 | ++counter; | |
4276 | ||
4277 | Array_type* at = this->expr_->type()->array_type(); | |
4278 | go_assert(at != NULL); | |
4279 | ||
4280 | // If we are not copying the value to the heap, we will only | |
4281 | // initialize the value once, so we can use this directly | |
4282 | // rather than copying it. In that case we can't make it | |
4283 | // read-only, because the program is permitted to change it. | |
3ae06f68 | 4284 | copy_to_heap = context->function() != NULL; |
f23d7786 | 4285 | } |
4286 | Bvariable* implicit = | |
aa5ae575 | 4287 | gogo->backend()->implicit_variable(buf, btype, true, copy_to_heap, |
5892f89f | 4288 | false, 0); |
aa5ae575 | 4289 | gogo->backend()->implicit_variable_set_init(implicit, buf, btype, |
4290 | true, copy_to_heap, false, | |
4291 | bexpr); | |
f23d7786 | 4292 | bexpr = gogo->backend()->var_expression(implicit, loc); |
76f85fd6 | 4293 | } |
4294 | else if ((this->expr_->is_composite_literal() | |
3ae06f68 | 4295 | || this->expr_->string_expression() != NULL) |
4296 | && this->expr_->is_static_initializer()) | |
f9ca30f9 | 4297 | { |
76f85fd6 | 4298 | // Build a decl for a constant constructor. |
f9ca30f9 | 4299 | snprintf(buf, sizeof buf, "C%u", counter); |
4300 | ++counter; | |
4301 | ||
4302 | Bvariable* decl = | |
4303 | gogo->backend()->immutable_struct(buf, true, false, btype, loc); | |
4304 | gogo->backend()->immutable_struct_set_init(decl, buf, true, false, | |
4305 | btype, loc, bexpr); | |
4306 | bexpr = gogo->backend()->var_expression(decl, loc); | |
4307 | } | |
09ea332d | 4308 | |
f9ca30f9 | 4309 | go_assert(!this->create_temp_ || this->expr_->is_variable()); |
4310 | ret = gogo->backend()->address_expression(bexpr, loc); | |
4311 | break; | |
e440a328 | 4312 | |
4313 | case OPERATOR_MULT: | |
4314 | { | |
f9ca30f9 | 4315 | go_assert(this->expr_->type()->points_to() != NULL); |
e440a328 | 4316 | |
4317 | // If we are dereferencing the pointer to a large struct, we | |
4318 | // need to check for nil. We don't bother to check for small | |
4319 | // structs because we expect the system to crash on a nil | |
56080003 | 4320 | // pointer dereference. However, if we know the address of this |
4321 | // expression is being taken, we must always check for nil. | |
f9ca30f9 | 4322 | |
4323 | Type* ptype = this->expr_->type()->points_to(); | |
4324 | Btype* pbtype = ptype->get_backend(gogo); | |
4325 | if (!ptype->is_void_type()) | |
e440a328 | 4326 | { |
2a305b85 | 4327 | int64_t s; |
4328 | bool ok = ptype->backend_type_size(gogo, &s); | |
4329 | if (!ok) | |
4330 | { | |
4331 | go_assert(saw_errors()); | |
4332 | return gogo->backend()->error_expression(); | |
4333 | } | |
f9ca30f9 | 4334 | if (s >= 4096 || this->issue_nil_check_) |
19b4f09b | 4335 | { |
f9ca30f9 | 4336 | go_assert(this->expr_->is_variable()); |
ea664253 | 4337 | Bexpression* nil = |
4338 | Expression::make_nil(loc)->get_backend(context); | |
f9ca30f9 | 4339 | Bexpression* compare = |
4340 | gogo->backend()->binary_expression(OPERATOR_EQEQ, bexpr, | |
4341 | nil, loc); | |
f9ca30f9 | 4342 | Bexpression* crash = |
ea664253 | 4343 | gogo->runtime_error(RUNTIME_ERROR_NIL_DEREFERENCE, |
4344 | loc)->get_backend(context); | |
f9ca30f9 | 4345 | bexpr = gogo->backend()->conditional_expression(btype, compare, |
4346 | crash, bexpr, | |
4347 | loc); | |
4348 | ||
19b4f09b | 4349 | } |
e440a328 | 4350 | } |
9b27b43c | 4351 | ret = gogo->backend()->indirect_expression(pbtype, bexpr, false, loc); |
e440a328 | 4352 | } |
f9ca30f9 | 4353 | break; |
e440a328 | 4354 | |
4355 | default: | |
c3e6f413 | 4356 | go_unreachable(); |
e440a328 | 4357 | } |
f9ca30f9 | 4358 | |
ea664253 | 4359 | return ret; |
e440a328 | 4360 | } |
4361 | ||
4362 | // Export a unary expression. | |
4363 | ||
4364 | void | |
4365 | Unary_expression::do_export(Export* exp) const | |
4366 | { | |
4367 | switch (this->op_) | |
4368 | { | |
4369 | case OPERATOR_PLUS: | |
4370 | exp->write_c_string("+ "); | |
4371 | break; | |
4372 | case OPERATOR_MINUS: | |
4373 | exp->write_c_string("- "); | |
4374 | break; | |
4375 | case OPERATOR_NOT: | |
4376 | exp->write_c_string("! "); | |
4377 | break; | |
4378 | case OPERATOR_XOR: | |
4379 | exp->write_c_string("^ "); | |
4380 | break; | |
4381 | case OPERATOR_AND: | |
4382 | case OPERATOR_MULT: | |
4383 | default: | |
c3e6f413 | 4384 | go_unreachable(); |
e440a328 | 4385 | } |
4386 | this->expr_->export_expression(exp); | |
4387 | } | |
4388 | ||
4389 | // Import a unary expression. | |
4390 | ||
4391 | Expression* | |
4392 | Unary_expression::do_import(Import* imp) | |
4393 | { | |
4394 | Operator op; | |
4395 | switch (imp->get_char()) | |
4396 | { | |
4397 | case '+': | |
4398 | op = OPERATOR_PLUS; | |
4399 | break; | |
4400 | case '-': | |
4401 | op = OPERATOR_MINUS; | |
4402 | break; | |
4403 | case '!': | |
4404 | op = OPERATOR_NOT; | |
4405 | break; | |
4406 | case '^': | |
4407 | op = OPERATOR_XOR; | |
4408 | break; | |
4409 | default: | |
c3e6f413 | 4410 | go_unreachable(); |
e440a328 | 4411 | } |
4412 | imp->require_c_string(" "); | |
4413 | Expression* expr = Expression::import_expression(imp); | |
4414 | return Expression::make_unary(op, expr, imp->location()); | |
4415 | } | |
4416 | ||
d751bb78 | 4417 | // Dump ast representation of an unary expression. |
4418 | ||
4419 | void | |
4420 | Unary_expression::do_dump_expression(Ast_dump_context* ast_dump_context) const | |
4421 | { | |
4422 | ast_dump_context->dump_operator(this->op_); | |
4423 | ast_dump_context->ostream() << "("; | |
4424 | ast_dump_context->dump_expression(this->expr_); | |
4425 | ast_dump_context->ostream() << ") "; | |
4426 | } | |
4427 | ||
e440a328 | 4428 | // Make a unary expression. |
4429 | ||
4430 | Expression* | |
b13c66cd | 4431 | Expression::make_unary(Operator op, Expression* expr, Location location) |
e440a328 | 4432 | { |
4433 | return new Unary_expression(op, expr, location); | |
4434 | } | |
4435 | ||
4436 | // If this is an indirection through a pointer, return the expression | |
4437 | // being pointed through. Otherwise return this. | |
4438 | ||
4439 | Expression* | |
4440 | Expression::deref() | |
4441 | { | |
4442 | if (this->classification_ == EXPRESSION_UNARY) | |
4443 | { | |
4444 | Unary_expression* ue = static_cast<Unary_expression*>(this); | |
4445 | if (ue->op() == OPERATOR_MULT) | |
4446 | return ue->operand(); | |
4447 | } | |
4448 | return this; | |
4449 | } | |
4450 | ||
4451 | // Class Binary_expression. | |
4452 | ||
4453 | // Traversal. | |
4454 | ||
4455 | int | |
4456 | Binary_expression::do_traverse(Traverse* traverse) | |
4457 | { | |
4458 | int t = Expression::traverse(&this->left_, traverse); | |
4459 | if (t == TRAVERSE_EXIT) | |
4460 | return TRAVERSE_EXIT; | |
4461 | return Expression::traverse(&this->right_, traverse); | |
4462 | } | |
4463 | ||
3ae06f68 | 4464 | // Return whether this expression may be used as a static initializer. |
4465 | ||
4466 | bool | |
4467 | Binary_expression::do_is_static_initializer() const | |
4468 | { | |
4469 | if (!this->left_->is_static_initializer() | |
4470 | || !this->right_->is_static_initializer()) | |
4471 | return false; | |
4472 | ||
4473 | // Addresses can be static initializers, but we can't implement | |
4474 | // arbitray binary expressions of them. | |
4475 | Unary_expression* lu = this->left_->unary_expression(); | |
4476 | Unary_expression* ru = this->right_->unary_expression(); | |
4477 | if (lu != NULL && lu->op() == OPERATOR_AND) | |
4478 | { | |
4479 | if (ru != NULL && ru->op() == OPERATOR_AND) | |
4480 | return this->op_ == OPERATOR_MINUS; | |
4481 | else | |
4482 | return this->op_ == OPERATOR_PLUS || this->op_ == OPERATOR_MINUS; | |
4483 | } | |
4484 | else if (ru != NULL && ru->op() == OPERATOR_AND) | |
4485 | return this->op_ == OPERATOR_PLUS || this->op_ == OPERATOR_MINUS; | |
4486 | ||
4487 | // Other cases should resolve in the backend. | |
4488 | return true; | |
4489 | } | |
4490 | ||
0c77715b | 4491 | // Return the type to use for a binary operation on operands of |
4492 | // LEFT_TYPE and RIGHT_TYPE. These are the types of constants and as | |
4493 | // such may be NULL or abstract. | |
4494 | ||
4495 | bool | |
4496 | Binary_expression::operation_type(Operator op, Type* left_type, | |
4497 | Type* right_type, Type** result_type) | |
4498 | { | |
4499 | if (left_type != right_type | |
4500 | && !left_type->is_abstract() | |
4501 | && !right_type->is_abstract() | |
4502 | && left_type->base() != right_type->base() | |
4503 | && op != OPERATOR_LSHIFT | |
4504 | && op != OPERATOR_RSHIFT) | |
4505 | { | |
4506 | // May be a type error--let it be diagnosed elsewhere. | |
4507 | return false; | |
4508 | } | |
4509 | ||
4510 | if (op == OPERATOR_LSHIFT || op == OPERATOR_RSHIFT) | |
4511 | { | |
4512 | if (left_type->integer_type() != NULL) | |
4513 | *result_type = left_type; | |
4514 | else | |
4515 | *result_type = Type::make_abstract_integer_type(); | |
4516 | } | |
4517 | else if (!left_type->is_abstract() && left_type->named_type() != NULL) | |
4518 | *result_type = left_type; | |
4519 | else if (!right_type->is_abstract() && right_type->named_type() != NULL) | |
4520 | *result_type = right_type; | |
4521 | else if (!left_type->is_abstract()) | |
4522 | *result_type = left_type; | |
4523 | else if (!right_type->is_abstract()) | |
4524 | *result_type = right_type; | |
4525 | else if (left_type->complex_type() != NULL) | |
4526 | *result_type = left_type; | |
4527 | else if (right_type->complex_type() != NULL) | |
4528 | *result_type = right_type; | |
4529 | else if (left_type->float_type() != NULL) | |
4530 | *result_type = left_type; | |
4531 | else if (right_type->float_type() != NULL) | |
4532 | *result_type = right_type; | |
4533 | else if (left_type->integer_type() != NULL | |
4534 | && left_type->integer_type()->is_rune()) | |
4535 | *result_type = left_type; | |
4536 | else if (right_type->integer_type() != NULL | |
4537 | && right_type->integer_type()->is_rune()) | |
4538 | *result_type = right_type; | |
4539 | else | |
4540 | *result_type = left_type; | |
4541 | ||
4542 | return true; | |
4543 | } | |
4544 | ||
4545 | // Convert an integer comparison code and an operator to a boolean | |
4546 | // value. | |
e440a328 | 4547 | |
4548 | bool | |
0c77715b | 4549 | Binary_expression::cmp_to_bool(Operator op, int cmp) |
e440a328 | 4550 | { |
e440a328 | 4551 | switch (op) |
4552 | { | |
4553 | case OPERATOR_EQEQ: | |
0c77715b | 4554 | return cmp == 0; |
4555 | break; | |
e440a328 | 4556 | case OPERATOR_NOTEQ: |
0c77715b | 4557 | return cmp != 0; |
4558 | break; | |
e440a328 | 4559 | case OPERATOR_LT: |
0c77715b | 4560 | return cmp < 0; |
4561 | break; | |
e440a328 | 4562 | case OPERATOR_LE: |
0c77715b | 4563 | return cmp <= 0; |
e440a328 | 4564 | case OPERATOR_GT: |
0c77715b | 4565 | return cmp > 0; |
e440a328 | 4566 | case OPERATOR_GE: |
0c77715b | 4567 | return cmp >= 0; |
e440a328 | 4568 | default: |
c3e6f413 | 4569 | go_unreachable(); |
e440a328 | 4570 | } |
4571 | } | |
4572 | ||
0c77715b | 4573 | // Compare constants according to OP. |
e440a328 | 4574 | |
4575 | bool | |
0c77715b | 4576 | Binary_expression::compare_constant(Operator op, Numeric_constant* left_nc, |
4577 | Numeric_constant* right_nc, | |
4578 | Location location, bool* result) | |
e440a328 | 4579 | { |
0c77715b | 4580 | Type* left_type = left_nc->type(); |
4581 | Type* right_type = right_nc->type(); | |
4582 | ||
4583 | Type* type; | |
4584 | if (!Binary_expression::operation_type(op, left_type, right_type, &type)) | |
4585 | return false; | |
4586 | ||
4587 | // When comparing an untyped operand to a typed operand, we are | |
4588 | // effectively coercing the untyped operand to the other operand's | |
4589 | // type, so make sure that is valid. | |
4590 | if (!left_nc->set_type(type, true, location) | |
4591 | || !right_nc->set_type(type, true, location)) | |
4592 | return false; | |
4593 | ||
4594 | bool ret; | |
4595 | int cmp; | |
4596 | if (type->complex_type() != NULL) | |
4597 | { | |
4598 | if (op != OPERATOR_EQEQ && op != OPERATOR_NOTEQ) | |
4599 | return false; | |
4600 | ret = Binary_expression::compare_complex(left_nc, right_nc, &cmp); | |
4601 | } | |
4602 | else if (type->float_type() != NULL) | |
4603 | ret = Binary_expression::compare_float(left_nc, right_nc, &cmp); | |
e440a328 | 4604 | else |
0c77715b | 4605 | ret = Binary_expression::compare_integer(left_nc, right_nc, &cmp); |
4606 | ||
4607 | if (ret) | |
4608 | *result = Binary_expression::cmp_to_bool(op, cmp); | |
4609 | ||
4610 | return ret; | |
4611 | } | |
4612 | ||
4613 | // Compare integer constants. | |
4614 | ||
4615 | bool | |
4616 | Binary_expression::compare_integer(const Numeric_constant* left_nc, | |
4617 | const Numeric_constant* right_nc, | |
4618 | int* cmp) | |
4619 | { | |
4620 | mpz_t left_val; | |
4621 | if (!left_nc->to_int(&left_val)) | |
4622 | return false; | |
4623 | mpz_t right_val; | |
4624 | if (!right_nc->to_int(&right_val)) | |
e440a328 | 4625 | { |
0c77715b | 4626 | mpz_clear(left_val); |
4627 | return false; | |
e440a328 | 4628 | } |
0c77715b | 4629 | |
4630 | *cmp = mpz_cmp(left_val, right_val); | |
4631 | ||
4632 | mpz_clear(left_val); | |
4633 | mpz_clear(right_val); | |
4634 | ||
4635 | return true; | |
4636 | } | |
4637 | ||
4638 | // Compare floating point constants. | |
4639 | ||
4640 | bool | |
4641 | Binary_expression::compare_float(const Numeric_constant* left_nc, | |
4642 | const Numeric_constant* right_nc, | |
4643 | int* cmp) | |
4644 | { | |
4645 | mpfr_t left_val; | |
4646 | if (!left_nc->to_float(&left_val)) | |
4647 | return false; | |
4648 | mpfr_t right_val; | |
4649 | if (!right_nc->to_float(&right_val)) | |
e440a328 | 4650 | { |
0c77715b | 4651 | mpfr_clear(left_val); |
4652 | return false; | |
4653 | } | |
4654 | ||
4655 | // We already coerced both operands to the same type. If that type | |
4656 | // is not an abstract type, we need to round the values accordingly. | |
4657 | Type* type = left_nc->type(); | |
4658 | if (!type->is_abstract() && type->float_type() != NULL) | |
4659 | { | |
4660 | int bits = type->float_type()->bits(); | |
4661 | mpfr_prec_round(left_val, bits, GMP_RNDN); | |
4662 | mpfr_prec_round(right_val, bits, GMP_RNDN); | |
e440a328 | 4663 | } |
0c77715b | 4664 | |
4665 | *cmp = mpfr_cmp(left_val, right_val); | |
4666 | ||
4667 | mpfr_clear(left_val); | |
4668 | mpfr_clear(right_val); | |
4669 | ||
4670 | return true; | |
e440a328 | 4671 | } |
4672 | ||
0c77715b | 4673 | // Compare complex constants. Complex numbers may only be compared |
4674 | // for equality. | |
e440a328 | 4675 | |
4676 | bool | |
0c77715b | 4677 | Binary_expression::compare_complex(const Numeric_constant* left_nc, |
4678 | const Numeric_constant* right_nc, | |
4679 | int* cmp) | |
e440a328 | 4680 | { |
fcbea5e4 | 4681 | mpc_t left_val; |
4682 | if (!left_nc->to_complex(&left_val)) | |
0c77715b | 4683 | return false; |
fcbea5e4 | 4684 | mpc_t right_val; |
4685 | if (!right_nc->to_complex(&right_val)) | |
e440a328 | 4686 | { |
fcbea5e4 | 4687 | mpc_clear(left_val); |
0c77715b | 4688 | return false; |
e440a328 | 4689 | } |
0c77715b | 4690 | |
4691 | // We already coerced both operands to the same type. If that type | |
4692 | // is not an abstract type, we need to round the values accordingly. | |
4693 | Type* type = left_nc->type(); | |
4694 | if (!type->is_abstract() && type->complex_type() != NULL) | |
e440a328 | 4695 | { |
0c77715b | 4696 | int bits = type->complex_type()->bits(); |
fcbea5e4 | 4697 | mpfr_prec_round(mpc_realref(left_val), bits / 2, GMP_RNDN); |
4698 | mpfr_prec_round(mpc_imagref(left_val), bits / 2, GMP_RNDN); | |
4699 | mpfr_prec_round(mpc_realref(right_val), bits / 2, GMP_RNDN); | |
4700 | mpfr_prec_round(mpc_imagref(right_val), bits / 2, GMP_RNDN); | |
e440a328 | 4701 | } |
0c77715b | 4702 | |
fcbea5e4 | 4703 | *cmp = mpc_cmp(left_val, right_val) != 0; |
0c77715b | 4704 | |
fcbea5e4 | 4705 | mpc_clear(left_val); |
4706 | mpc_clear(right_val); | |
0c77715b | 4707 | |
4708 | return true; | |
e440a328 | 4709 | } |
4710 | ||
0c77715b | 4711 | // Apply binary opcode OP to LEFT_NC and RIGHT_NC, setting NC. Return |
4712 | // true if this could be done, false if not. Issue errors at LOCATION | |
4713 | // as appropriate. | |
e440a328 | 4714 | |
4715 | bool | |
0c77715b | 4716 | Binary_expression::eval_constant(Operator op, Numeric_constant* left_nc, |
4717 | Numeric_constant* right_nc, | |
4718 | Location location, Numeric_constant* nc) | |
e440a328 | 4719 | { |
e440a328 | 4720 | switch (op) |
4721 | { | |
4722 | case OPERATOR_OROR: | |
4723 | case OPERATOR_ANDAND: | |
4724 | case OPERATOR_EQEQ: | |
4725 | case OPERATOR_NOTEQ: | |
4726 | case OPERATOR_LT: | |
4727 | case OPERATOR_LE: | |
4728 | case OPERATOR_GT: | |
4729 | case OPERATOR_GE: | |
9767e2d3 | 4730 | // These return boolean values, not numeric. |
4731 | return false; | |
0c77715b | 4732 | default: |
4733 | break; | |
4734 | } | |
4735 | ||
4736 | Type* left_type = left_nc->type(); | |
4737 | Type* right_type = right_nc->type(); | |
4738 | ||
4739 | Type* type; | |
4740 | if (!Binary_expression::operation_type(op, left_type, right_type, &type)) | |
4741 | return false; | |
4742 | ||
4743 | bool is_shift = op == OPERATOR_LSHIFT || op == OPERATOR_RSHIFT; | |
4744 | ||
4745 | // When combining an untyped operand with a typed operand, we are | |
4746 | // effectively coercing the untyped operand to the other operand's | |
4747 | // type, so make sure that is valid. | |
4748 | if (!left_nc->set_type(type, true, location)) | |
4749 | return false; | |
4750 | if (!is_shift && !right_nc->set_type(type, true, location)) | |
4751 | return false; | |
85334a21 | 4752 | if (is_shift |
4753 | && ((left_type->integer_type() == NULL | |
4754 | && !left_type->is_abstract()) | |
4755 | || (right_type->integer_type() == NULL | |
4756 | && !right_type->is_abstract()))) | |
4757 | return false; | |
0c77715b | 4758 | |
4759 | bool r; | |
4760 | if (type->complex_type() != NULL) | |
4761 | r = Binary_expression::eval_complex(op, left_nc, right_nc, location, nc); | |
4762 | else if (type->float_type() != NULL) | |
4763 | r = Binary_expression::eval_float(op, left_nc, right_nc, location, nc); | |
4764 | else | |
4765 | r = Binary_expression::eval_integer(op, left_nc, right_nc, location, nc); | |
4766 | ||
4767 | if (r) | |
4768 | r = nc->set_type(type, true, location); | |
4769 | ||
4770 | return r; | |
4771 | } | |
4772 | ||
4773 | // Apply binary opcode OP to LEFT_NC and RIGHT_NC, setting NC, using | |
4774 | // integer operations. Return true if this could be done, false if | |
4775 | // not. | |
4776 | ||
4777 | bool | |
4778 | Binary_expression::eval_integer(Operator op, const Numeric_constant* left_nc, | |
4779 | const Numeric_constant* right_nc, | |
4780 | Location location, Numeric_constant* nc) | |
4781 | { | |
4782 | mpz_t left_val; | |
4783 | if (!left_nc->to_int(&left_val)) | |
4784 | return false; | |
4785 | mpz_t right_val; | |
4786 | if (!right_nc->to_int(&right_val)) | |
4787 | { | |
4788 | mpz_clear(left_val); | |
e440a328 | 4789 | return false; |
0c77715b | 4790 | } |
4791 | ||
4792 | mpz_t val; | |
4793 | mpz_init(val); | |
4794 | ||
4795 | switch (op) | |
4796 | { | |
e440a328 | 4797 | case OPERATOR_PLUS: |
4798 | mpz_add(val, left_val, right_val); | |
2c809f8f | 4799 | if (mpz_sizeinbase(val, 2) > 0x100000) |
4800 | { | |
631d5788 | 4801 | go_error_at(location, "constant addition overflow"); |
71a45216 | 4802 | nc->set_invalid(); |
2c809f8f | 4803 | mpz_set_ui(val, 1); |
4804 | } | |
e440a328 | 4805 | break; |
4806 | case OPERATOR_MINUS: | |
4807 | mpz_sub(val, left_val, right_val); | |
2c809f8f | 4808 | if (mpz_sizeinbase(val, 2) > 0x100000) |
4809 | { | |
631d5788 | 4810 | go_error_at(location, "constant subtraction overflow"); |
71a45216 | 4811 | nc->set_invalid(); |
2c809f8f | 4812 | mpz_set_ui(val, 1); |
4813 | } | |
e440a328 | 4814 | break; |
4815 | case OPERATOR_OR: | |
4816 | mpz_ior(val, left_val, right_val); | |
4817 | break; | |
4818 | case OPERATOR_XOR: | |
4819 | mpz_xor(val, left_val, right_val); | |
4820 | break; | |
4821 | case OPERATOR_MULT: | |
4822 | mpz_mul(val, left_val, right_val); | |
2c809f8f | 4823 | if (mpz_sizeinbase(val, 2) > 0x100000) |
4824 | { | |
631d5788 | 4825 | go_error_at(location, "constant multiplication overflow"); |
71a45216 | 4826 | nc->set_invalid(); |
2c809f8f | 4827 | mpz_set_ui(val, 1); |
4828 | } | |
e440a328 | 4829 | break; |
4830 | case OPERATOR_DIV: | |
4831 | if (mpz_sgn(right_val) != 0) | |
4832 | mpz_tdiv_q(val, left_val, right_val); | |
4833 | else | |
4834 | { | |
631d5788 | 4835 | go_error_at(location, "division by zero"); |
71a45216 | 4836 | nc->set_invalid(); |
e440a328 | 4837 | mpz_set_ui(val, 0); |
e440a328 | 4838 | } |
4839 | break; | |
4840 | case OPERATOR_MOD: | |
4841 | if (mpz_sgn(right_val) != 0) | |
4842 | mpz_tdiv_r(val, left_val, right_val); | |
4843 | else | |
4844 | { | |
631d5788 | 4845 | go_error_at(location, "division by zero"); |
71a45216 | 4846 | nc->set_invalid(); |
e440a328 | 4847 | mpz_set_ui(val, 0); |
e440a328 | 4848 | } |
4849 | break; | |
4850 | case OPERATOR_LSHIFT: | |
4851 | { | |
4852 | unsigned long shift = mpz_get_ui(right_val); | |
0c77715b | 4853 | if (mpz_cmp_ui(right_val, shift) == 0 && shift <= 0x100000) |
4854 | mpz_mul_2exp(val, left_val, shift); | |
4855 | else | |
e440a328 | 4856 | { |
631d5788 | 4857 | go_error_at(location, "shift count overflow"); |
71a45216 | 4858 | nc->set_invalid(); |
2c809f8f | 4859 | mpz_set_ui(val, 1); |
e440a328 | 4860 | } |
e440a328 | 4861 | break; |
4862 | } | |
4863 | break; | |
4864 | case OPERATOR_RSHIFT: | |
4865 | { | |
4866 | unsigned long shift = mpz_get_ui(right_val); | |
4867 | if (mpz_cmp_ui(right_val, shift) != 0) | |
4868 | { | |
631d5788 | 4869 | go_error_at(location, "shift count overflow"); |
71a45216 | 4870 | nc->set_invalid(); |
2c809f8f | 4871 | mpz_set_ui(val, 1); |
e440a328 | 4872 | } |
e440a328 | 4873 | else |
0c77715b | 4874 | { |
4875 | if (mpz_cmp_ui(left_val, 0) >= 0) | |
4876 | mpz_tdiv_q_2exp(val, left_val, shift); | |
4877 | else | |
4878 | mpz_fdiv_q_2exp(val, left_val, shift); | |
4879 | } | |
e440a328 | 4880 | break; |
4881 | } | |
4882 | break; | |
4883 | case OPERATOR_AND: | |
4884 | mpz_and(val, left_val, right_val); | |
4885 | break; | |
4886 | case OPERATOR_BITCLEAR: | |
4887 | { | |
4888 | mpz_t tval; | |
4889 | mpz_init(tval); | |
4890 | mpz_com(tval, right_val); | |
4891 | mpz_and(val, left_val, tval); | |
4892 | mpz_clear(tval); | |
4893 | } | |
4894 | break; | |
4895 | default: | |
c3e6f413 | 4896 | go_unreachable(); |
e440a328 | 4897 | } |
4898 | ||
0c77715b | 4899 | mpz_clear(left_val); |
4900 | mpz_clear(right_val); | |
e440a328 | 4901 | |
0c77715b | 4902 | if (left_nc->is_rune() |
4903 | || (op != OPERATOR_LSHIFT | |
4904 | && op != OPERATOR_RSHIFT | |
4905 | && right_nc->is_rune())) | |
4906 | nc->set_rune(NULL, val); | |
4907 | else | |
4908 | nc->set_int(NULL, val); | |
4909 | ||
4910 | mpz_clear(val); | |
e440a328 | 4911 | |
4912 | return true; | |
4913 | } | |
4914 | ||
0c77715b | 4915 | // Apply binary opcode OP to LEFT_NC and RIGHT_NC, setting NC, using |
4916 | // floating point operations. Return true if this could be done, | |
4917 | // false if not. | |
e440a328 | 4918 | |
4919 | bool | |
0c77715b | 4920 | Binary_expression::eval_float(Operator op, const Numeric_constant* left_nc, |
4921 | const Numeric_constant* right_nc, | |
4922 | Location location, Numeric_constant* nc) | |
e440a328 | 4923 | { |
0c77715b | 4924 | mpfr_t left_val; |
4925 | if (!left_nc->to_float(&left_val)) | |
4926 | return false; | |
4927 | mpfr_t right_val; | |
4928 | if (!right_nc->to_float(&right_val)) | |
e440a328 | 4929 | { |
0c77715b | 4930 | mpfr_clear(left_val); |
e440a328 | 4931 | return false; |
0c77715b | 4932 | } |
4933 | ||
4934 | mpfr_t val; | |
4935 | mpfr_init(val); | |
4936 | ||
4937 | bool ret = true; | |
4938 | switch (op) | |
4939 | { | |
e440a328 | 4940 | case OPERATOR_PLUS: |
4941 | mpfr_add(val, left_val, right_val, GMP_RNDN); | |
4942 | break; | |
4943 | case OPERATOR_MINUS: | |
4944 | mpfr_sub(val, left_val, right_val, GMP_RNDN); | |
4945 | break; | |
4946 | case OPERATOR_OR: | |
4947 | case OPERATOR_XOR: | |
4948 | case OPERATOR_AND: | |
4949 | case OPERATOR_BITCLEAR: | |
0c77715b | 4950 | case OPERATOR_MOD: |
4951 | case OPERATOR_LSHIFT: | |
4952 | case OPERATOR_RSHIFT: | |
4953 | mpfr_set_ui(val, 0, GMP_RNDN); | |
4954 | ret = false; | |
4955 | break; | |
e440a328 | 4956 | case OPERATOR_MULT: |
4957 | mpfr_mul(val, left_val, right_val, GMP_RNDN); | |
4958 | break; | |
4959 | case OPERATOR_DIV: | |
0c77715b | 4960 | if (!mpfr_zero_p(right_val)) |
4961 | mpfr_div(val, left_val, right_val, GMP_RNDN); | |
4962 | else | |
4963 | { | |
631d5788 | 4964 | go_error_at(location, "division by zero"); |
71a45216 | 4965 | nc->set_invalid(); |
0c77715b | 4966 | mpfr_set_ui(val, 0, GMP_RNDN); |
4967 | } | |
e440a328 | 4968 | break; |
e440a328 | 4969 | default: |
c3e6f413 | 4970 | go_unreachable(); |
e440a328 | 4971 | } |
4972 | ||
0c77715b | 4973 | mpfr_clear(left_val); |
4974 | mpfr_clear(right_val); | |
e440a328 | 4975 | |
0c77715b | 4976 | nc->set_float(NULL, val); |
4977 | mpfr_clear(val); | |
e440a328 | 4978 | |
0c77715b | 4979 | return ret; |
e440a328 | 4980 | } |
4981 | ||
0c77715b | 4982 | // Apply binary opcode OP to LEFT_NC and RIGHT_NC, setting NC, using |
4983 | // complex operations. Return true if this could be done, false if | |
4984 | // not. | |
e440a328 | 4985 | |
4986 | bool | |
0c77715b | 4987 | Binary_expression::eval_complex(Operator op, const Numeric_constant* left_nc, |
4988 | const Numeric_constant* right_nc, | |
4989 | Location location, Numeric_constant* nc) | |
e440a328 | 4990 | { |
fcbea5e4 | 4991 | mpc_t left_val; |
4992 | if (!left_nc->to_complex(&left_val)) | |
0c77715b | 4993 | return false; |
fcbea5e4 | 4994 | mpc_t right_val; |
4995 | if (!right_nc->to_complex(&right_val)) | |
e440a328 | 4996 | { |
fcbea5e4 | 4997 | mpc_clear(left_val); |
e440a328 | 4998 | return false; |
0c77715b | 4999 | } |
5000 | ||
fcbea5e4 | 5001 | mpc_t val; |
5002 | mpc_init2(val, mpc_precision); | |
0c77715b | 5003 | |
5004 | bool ret = true; | |
5005 | switch (op) | |
5006 | { | |
e440a328 | 5007 | case OPERATOR_PLUS: |
fcbea5e4 | 5008 | mpc_add(val, left_val, right_val, MPC_RNDNN); |
e440a328 | 5009 | break; |
5010 | case OPERATOR_MINUS: | |
fcbea5e4 | 5011 | mpc_sub(val, left_val, right_val, MPC_RNDNN); |
e440a328 | 5012 | break; |
5013 | case OPERATOR_OR: | |
5014 | case OPERATOR_XOR: | |
5015 | case OPERATOR_AND: | |
5016 | case OPERATOR_BITCLEAR: | |
0c77715b | 5017 | case OPERATOR_MOD: |
5018 | case OPERATOR_LSHIFT: | |
5019 | case OPERATOR_RSHIFT: | |
fcbea5e4 | 5020 | mpc_set_ui(val, 0, MPC_RNDNN); |
0c77715b | 5021 | ret = false; |
5022 | break; | |
e440a328 | 5023 | case OPERATOR_MULT: |
fcbea5e4 | 5024 | mpc_mul(val, left_val, right_val, MPC_RNDNN); |
e440a328 | 5025 | break; |
5026 | case OPERATOR_DIV: | |
fcbea5e4 | 5027 | if (mpc_cmp_si(right_val, 0) == 0) |
5028 | { | |
631d5788 | 5029 | go_error_at(location, "division by zero"); |
71a45216 | 5030 | nc->set_invalid(); |
fcbea5e4 | 5031 | mpc_set_ui(val, 0, MPC_RNDNN); |
5032 | break; | |
5033 | } | |
5034 | mpc_div(val, left_val, right_val, MPC_RNDNN); | |
e440a328 | 5035 | break; |
e440a328 | 5036 | default: |
c3e6f413 | 5037 | go_unreachable(); |
e440a328 | 5038 | } |
5039 | ||
fcbea5e4 | 5040 | mpc_clear(left_val); |
5041 | mpc_clear(right_val); | |
e440a328 | 5042 | |
fcbea5e4 | 5043 | nc->set_complex(NULL, val); |
5044 | mpc_clear(val); | |
e440a328 | 5045 | |
0c77715b | 5046 | return ret; |
e440a328 | 5047 | } |
5048 | ||
5049 | // Lower a binary expression. We have to evaluate constant | |
5050 | // expressions now, in order to implement Go's unlimited precision | |
5051 | // constants. | |
5052 | ||
5053 | Expression* | |
e9d3367e | 5054 | Binary_expression::do_lower(Gogo* gogo, Named_object*, |
5055 | Statement_inserter* inserter, int) | |
e440a328 | 5056 | { |
b13c66cd | 5057 | Location location = this->location(); |
e440a328 | 5058 | Operator op = this->op_; |
5059 | Expression* left = this->left_; | |
5060 | Expression* right = this->right_; | |
5061 | ||
5062 | const bool is_comparison = (op == OPERATOR_EQEQ | |
5063 | || op == OPERATOR_NOTEQ | |
5064 | || op == OPERATOR_LT | |
5065 | || op == OPERATOR_LE | |
5066 | || op == OPERATOR_GT | |
5067 | || op == OPERATOR_GE); | |
5068 | ||
0c77715b | 5069 | // Numeric constant expressions. |
e440a328 | 5070 | { |
0c77715b | 5071 | Numeric_constant left_nc; |
5072 | Numeric_constant right_nc; | |
5073 | if (left->numeric_constant_value(&left_nc) | |
5074 | && right->numeric_constant_value(&right_nc)) | |
e440a328 | 5075 | { |
0c77715b | 5076 | if (is_comparison) |
e440a328 | 5077 | { |
0c77715b | 5078 | bool result; |
5079 | if (!Binary_expression::compare_constant(op, &left_nc, | |
5080 | &right_nc, location, | |
5081 | &result)) | |
5082 | return this; | |
e90c9dfc | 5083 | return Expression::make_cast(Type::make_boolean_type(), |
0c77715b | 5084 | Expression::make_boolean(result, |
5085 | location), | |
5086 | location); | |
e440a328 | 5087 | } |
5088 | else | |
5089 | { | |
0c77715b | 5090 | Numeric_constant nc; |
5091 | if (!Binary_expression::eval_constant(op, &left_nc, &right_nc, | |
5092 | location, &nc)) | |
71a45216 | 5093 | return this; |
0c77715b | 5094 | return nc.expression(location); |
e440a328 | 5095 | } |
5096 | } | |
e440a328 | 5097 | } |
5098 | ||
5099 | // String constant expressions. | |
315fa98d | 5100 | if (left->type()->is_string_type() && right->type()->is_string_type()) |
e440a328 | 5101 | { |
5102 | std::string left_string; | |
5103 | std::string right_string; | |
5104 | if (left->string_constant_value(&left_string) | |
5105 | && right->string_constant_value(&right_string)) | |
315fa98d | 5106 | { |
5107 | if (op == OPERATOR_PLUS) | |
5108 | return Expression::make_string(left_string + right_string, | |
5109 | location); | |
5110 | else if (is_comparison) | |
5111 | { | |
5112 | int cmp = left_string.compare(right_string); | |
0c77715b | 5113 | bool r = Binary_expression::cmp_to_bool(op, cmp); |
e90c9dfc | 5114 | return Expression::make_boolean(r, location); |
b40dc774 | 5115 | } |
5116 | } | |
b40dc774 | 5117 | } |
5118 | ||
ceeb12d7 | 5119 | // Lower struct, array, and some interface comparisons. |
e9d3367e | 5120 | if (op == OPERATOR_EQEQ || op == OPERATOR_NOTEQ) |
5121 | { | |
b79832ca | 5122 | if (left->type()->struct_type() != NULL |
5123 | && right->type()->struct_type() != NULL) | |
e9d3367e | 5124 | return this->lower_struct_comparison(gogo, inserter); |
5125 | else if (left->type()->array_type() != NULL | |
b79832ca | 5126 | && !left->type()->is_slice_type() |
5127 | && right->type()->array_type() != NULL | |
5128 | && !right->type()->is_slice_type()) | |
e9d3367e | 5129 | return this->lower_array_comparison(gogo, inserter); |
ceeb12d7 | 5130 | else if ((left->type()->interface_type() != NULL |
5131 | && right->type()->interface_type() == NULL) | |
5132 | || (left->type()->interface_type() == NULL | |
5133 | && right->type()->interface_type() != NULL)) | |
5134 | return this->lower_interface_value_comparison(gogo, inserter); | |
e9d3367e | 5135 | } |
5136 | ||
736a16ba | 5137 | // Lower string concatenation to String_concat_expression, so that |
5138 | // we can group sequences of string additions. | |
5139 | if (this->left_->type()->is_string_type() && this->op_ == OPERATOR_PLUS) | |
5140 | { | |
5141 | Expression_list* exprs; | |
5142 | String_concat_expression* left_sce = | |
5143 | this->left_->string_concat_expression(); | |
5144 | if (left_sce != NULL) | |
5145 | exprs = left_sce->exprs(); | |
5146 | else | |
5147 | { | |
5148 | exprs = new Expression_list(); | |
5149 | exprs->push_back(this->left_); | |
5150 | } | |
5151 | ||
5152 | String_concat_expression* right_sce = | |
5153 | this->right_->string_concat_expression(); | |
5154 | if (right_sce != NULL) | |
5155 | exprs->append(right_sce->exprs()); | |
5156 | else | |
5157 | exprs->push_back(this->right_); | |
5158 | ||
5159 | return Expression::make_string_concat(exprs); | |
5160 | } | |
5161 | ||
e440a328 | 5162 | return this; |
5163 | } | |
5164 | ||
e9d3367e | 5165 | // Lower a struct comparison. |
5166 | ||
5167 | Expression* | |
5168 | Binary_expression::lower_struct_comparison(Gogo* gogo, | |
5169 | Statement_inserter* inserter) | |
5170 | { | |
5171 | Struct_type* st = this->left_->type()->struct_type(); | |
5172 | Struct_type* st2 = this->right_->type()->struct_type(); | |
5173 | if (st2 == NULL) | |
5174 | return this; | |
5175 | if (st != st2 && !Type::are_identical(st, st2, false, NULL)) | |
5176 | return this; | |
5177 | if (!Type::are_compatible_for_comparison(true, this->left_->type(), | |
5178 | this->right_->type(), NULL)) | |
5179 | return this; | |
5180 | ||
5181 | // See if we can compare using memcmp. As a heuristic, we use | |
5182 | // memcmp rather than field references and comparisons if there are | |
5183 | // more than two fields. | |
113ef6a5 | 5184 | if (st->compare_is_identity(gogo) && st->total_field_count() > 2) |
e9d3367e | 5185 | return this->lower_compare_to_memcmp(gogo, inserter); |
5186 | ||
5187 | Location loc = this->location(); | |
5188 | ||
5189 | Expression* left = this->left_; | |
5190 | Temporary_statement* left_temp = NULL; | |
5191 | if (left->var_expression() == NULL | |
5192 | && left->temporary_reference_expression() == NULL) | |
5193 | { | |
5194 | left_temp = Statement::make_temporary(left->type(), NULL, loc); | |
5195 | inserter->insert(left_temp); | |
5196 | left = Expression::make_set_and_use_temporary(left_temp, left, loc); | |
5197 | } | |
5198 | ||
5199 | Expression* right = this->right_; | |
5200 | Temporary_statement* right_temp = NULL; | |
5201 | if (right->var_expression() == NULL | |
5202 | && right->temporary_reference_expression() == NULL) | |
5203 | { | |
5204 | right_temp = Statement::make_temporary(right->type(), NULL, loc); | |
5205 | inserter->insert(right_temp); | |
5206 | right = Expression::make_set_and_use_temporary(right_temp, right, loc); | |
5207 | } | |
5208 | ||
5209 | Expression* ret = Expression::make_boolean(true, loc); | |
5210 | const Struct_field_list* fields = st->fields(); | |
5211 | unsigned int field_index = 0; | |
5212 | for (Struct_field_list::const_iterator pf = fields->begin(); | |
5213 | pf != fields->end(); | |
5214 | ++pf, ++field_index) | |
5215 | { | |
f5165c05 | 5216 | if (Gogo::is_sink_name(pf->field_name())) |
5217 | continue; | |
5218 | ||
e9d3367e | 5219 | if (field_index > 0) |
5220 | { | |
5221 | if (left_temp == NULL) | |
5222 | left = left->copy(); | |
5223 | else | |
5224 | left = Expression::make_temporary_reference(left_temp, loc); | |
5225 | if (right_temp == NULL) | |
5226 | right = right->copy(); | |
5227 | else | |
5228 | right = Expression::make_temporary_reference(right_temp, loc); | |
5229 | } | |
5230 | Expression* f1 = Expression::make_field_reference(left, field_index, | |
5231 | loc); | |
5232 | Expression* f2 = Expression::make_field_reference(right, field_index, | |
5233 | loc); | |
5234 | Expression* cond = Expression::make_binary(OPERATOR_EQEQ, f1, f2, loc); | |
5235 | ret = Expression::make_binary(OPERATOR_ANDAND, ret, cond, loc); | |
5236 | } | |
5237 | ||
5238 | if (this->op_ == OPERATOR_NOTEQ) | |
5239 | ret = Expression::make_unary(OPERATOR_NOT, ret, loc); | |
5240 | ||
5241 | return ret; | |
5242 | } | |
5243 | ||
5244 | // Lower an array comparison. | |
5245 | ||
5246 | Expression* | |
5247 | Binary_expression::lower_array_comparison(Gogo* gogo, | |
5248 | Statement_inserter* inserter) | |
5249 | { | |
5250 | Array_type* at = this->left_->type()->array_type(); | |
5251 | Array_type* at2 = this->right_->type()->array_type(); | |
5252 | if (at2 == NULL) | |
5253 | return this; | |
5254 | if (at != at2 && !Type::are_identical(at, at2, false, NULL)) | |
5255 | return this; | |
5256 | if (!Type::are_compatible_for_comparison(true, this->left_->type(), | |
5257 | this->right_->type(), NULL)) | |
5258 | return this; | |
5259 | ||
5260 | // Call memcmp directly if possible. This may let the middle-end | |
5261 | // optimize the call. | |
113ef6a5 | 5262 | if (at->compare_is_identity(gogo)) |
e9d3367e | 5263 | return this->lower_compare_to_memcmp(gogo, inserter); |
5264 | ||
5265 | // Call the array comparison function. | |
5266 | Named_object* hash_fn; | |
5267 | Named_object* equal_fn; | |
5268 | at->type_functions(gogo, this->left_->type()->named_type(), NULL, NULL, | |
5269 | &hash_fn, &equal_fn); | |
5270 | ||
5271 | Location loc = this->location(); | |
5272 | ||
5273 | Expression* func = Expression::make_func_reference(equal_fn, NULL, loc); | |
5274 | ||
5275 | Expression_list* args = new Expression_list(); | |
5276 | args->push_back(this->operand_address(inserter, this->left_)); | |
5277 | args->push_back(this->operand_address(inserter, this->right_)); | |
5278 | args->push_back(Expression::make_type_info(at, TYPE_INFO_SIZE)); | |
5279 | ||
5280 | Expression* ret = Expression::make_call(func, args, false, loc); | |
5281 | ||
5282 | if (this->op_ == OPERATOR_NOTEQ) | |
5283 | ret = Expression::make_unary(OPERATOR_NOT, ret, loc); | |
5284 | ||
5285 | return ret; | |
5286 | } | |
5287 | ||
ceeb12d7 | 5288 | // Lower an interface to value comparison. |
5289 | ||
5290 | Expression* | |
5291 | Binary_expression::lower_interface_value_comparison(Gogo*, | |
5292 | Statement_inserter* inserter) | |
5293 | { | |
5294 | Type* left_type = this->left_->type(); | |
5295 | Type* right_type = this->right_->type(); | |
5296 | Interface_type* ift; | |
5297 | if (left_type->interface_type() != NULL) | |
5298 | { | |
5299 | ift = left_type->interface_type(); | |
5300 | if (!ift->implements_interface(right_type, NULL)) | |
5301 | return this; | |
5302 | } | |
5303 | else | |
5304 | { | |
5305 | ift = right_type->interface_type(); | |
5306 | if (!ift->implements_interface(left_type, NULL)) | |
5307 | return this; | |
5308 | } | |
5309 | if (!Type::are_compatible_for_comparison(true, left_type, right_type, NULL)) | |
5310 | return this; | |
5311 | ||
5312 | Location loc = this->location(); | |
5313 | ||
5314 | if (left_type->interface_type() == NULL | |
5315 | && left_type->points_to() == NULL | |
5316 | && !this->left_->is_addressable()) | |
5317 | { | |
5318 | Temporary_statement* temp = | |
5319 | Statement::make_temporary(left_type, NULL, loc); | |
5320 | inserter->insert(temp); | |
5321 | this->left_ = | |
5322 | Expression::make_set_and_use_temporary(temp, this->left_, loc); | |
5323 | } | |
5324 | ||
5325 | if (right_type->interface_type() == NULL | |
5326 | && right_type->points_to() == NULL | |
5327 | && !this->right_->is_addressable()) | |
5328 | { | |
5329 | Temporary_statement* temp = | |
5330 | Statement::make_temporary(right_type, NULL, loc); | |
5331 | inserter->insert(temp); | |
5332 | this->right_ = | |
5333 | Expression::make_set_and_use_temporary(temp, this->right_, loc); | |
5334 | } | |
5335 | ||
5336 | return this; | |
5337 | } | |
5338 | ||
e9d3367e | 5339 | // Lower a struct or array comparison to a call to memcmp. |
5340 | ||
5341 | Expression* | |
5342 | Binary_expression::lower_compare_to_memcmp(Gogo*, Statement_inserter* inserter) | |
5343 | { | |
5344 | Location loc = this->location(); | |
5345 | ||
5346 | Expression* a1 = this->operand_address(inserter, this->left_); | |
5347 | Expression* a2 = this->operand_address(inserter, this->right_); | |
5348 | Expression* len = Expression::make_type_info(this->left_->type(), | |
5349 | TYPE_INFO_SIZE); | |
5350 | ||
5351 | Expression* call = Runtime::make_call(Runtime::MEMCMP, loc, 3, a1, a2, len); | |
e67508fa | 5352 | Expression* zero = Expression::make_integer_ul(0, NULL, loc); |
e9d3367e | 5353 | return Expression::make_binary(this->op_, call, zero, loc); |
5354 | } | |
5355 | ||
a32698ee | 5356 | Expression* |
5c3f3470 | 5357 | Binary_expression::do_flatten(Gogo* gogo, Named_object*, |
a32698ee | 5358 | Statement_inserter* inserter) |
5359 | { | |
5360 | Location loc = this->location(); | |
5bf8be8b | 5361 | if (this->left_->type()->is_error_type() |
5362 | || this->right_->type()->is_error_type() | |
5363 | || this->left_->is_error_expression() | |
5364 | || this->right_->is_error_expression()) | |
5365 | { | |
5366 | go_assert(saw_errors()); | |
5367 | return Expression::make_error(loc); | |
5368 | } | |
5369 | ||
a32698ee | 5370 | Temporary_statement* temp; |
a32698ee | 5371 | |
5372 | Type* left_type = this->left_->type(); | |
5373 | bool is_shift_op = (this->op_ == OPERATOR_LSHIFT | |
5374 | || this->op_ == OPERATOR_RSHIFT); | |
5375 | bool is_idiv_op = ((this->op_ == OPERATOR_DIV && | |
5376 | left_type->integer_type() != NULL) | |
5377 | || this->op_ == OPERATOR_MOD); | |
5378 | ||
a32698ee | 5379 | if (is_shift_op |
5c3f3470 | 5380 | || (is_idiv_op |
5381 | && (gogo->check_divide_by_zero() || gogo->check_divide_overflow()))) | |
a32698ee | 5382 | { |
545ab43b | 5383 | if (!this->left_->is_variable() && !this->left_->is_constant()) |
a32698ee | 5384 | { |
5385 | temp = Statement::make_temporary(NULL, this->left_, loc); | |
5386 | inserter->insert(temp); | |
5387 | this->left_ = Expression::make_temporary_reference(temp, loc); | |
5388 | } | |
545ab43b | 5389 | if (!this->right_->is_variable() && !this->right_->is_constant()) |
a32698ee | 5390 | { |
5391 | temp = | |
5392 | Statement::make_temporary(NULL, this->right_, loc); | |
5393 | this->right_ = Expression::make_temporary_reference(temp, loc); | |
5394 | inserter->insert(temp); | |
5395 | } | |
5396 | } | |
5397 | return this; | |
5398 | } | |
5399 | ||
5400 | ||
e9d3367e | 5401 | // Return the address of EXPR, cast to unsafe.Pointer. |
5402 | ||
5403 | Expression* | |
5404 | Binary_expression::operand_address(Statement_inserter* inserter, | |
5405 | Expression* expr) | |
5406 | { | |
5407 | Location loc = this->location(); | |
5408 | ||
5409 | if (!expr->is_addressable()) | |
5410 | { | |
5411 | Temporary_statement* temp = Statement::make_temporary(expr->type(), NULL, | |
5412 | loc); | |
5413 | inserter->insert(temp); | |
5414 | expr = Expression::make_set_and_use_temporary(temp, expr, loc); | |
5415 | } | |
5416 | expr = Expression::make_unary(OPERATOR_AND, expr, loc); | |
5417 | static_cast<Unary_expression*>(expr)->set_does_not_escape(); | |
5418 | Type* void_type = Type::make_void_type(); | |
5419 | Type* unsafe_pointer_type = Type::make_pointer_type(void_type); | |
5420 | return Expression::make_cast(unsafe_pointer_type, expr, loc); | |
5421 | } | |
5422 | ||
0c77715b | 5423 | // Return the numeric constant value, if it has one. |
e440a328 | 5424 | |
5425 | bool | |
0c77715b | 5426 | Binary_expression::do_numeric_constant_value(Numeric_constant* nc) const |
e440a328 | 5427 | { |
0c77715b | 5428 | Numeric_constant left_nc; |
5429 | if (!this->left_->numeric_constant_value(&left_nc)) | |
5430 | return false; | |
5431 | Numeric_constant right_nc; | |
5432 | if (!this->right_->numeric_constant_value(&right_nc)) | |
5433 | return false; | |
9767e2d3 | 5434 | return Binary_expression::eval_constant(this->op_, &left_nc, &right_nc, |
0c77715b | 5435 | this->location(), nc); |
e440a328 | 5436 | } |
5437 | ||
5438 | // Note that the value is being discarded. | |
5439 | ||
4f2138d7 | 5440 | bool |
e440a328 | 5441 | Binary_expression::do_discarding_value() |
5442 | { | |
5443 | if (this->op_ == OPERATOR_OROR || this->op_ == OPERATOR_ANDAND) | |
4f2138d7 | 5444 | return this->right_->discarding_value(); |
e440a328 | 5445 | else |
4f2138d7 | 5446 | { |
5447 | this->unused_value_error(); | |
5448 | return false; | |
5449 | } | |
e440a328 | 5450 | } |
5451 | ||
5452 | // Get type. | |
5453 | ||
5454 | Type* | |
5455 | Binary_expression::do_type() | |
5456 | { | |
5f5fea79 | 5457 | if (this->classification() == EXPRESSION_ERROR) |
5458 | return Type::make_error_type(); | |
5459 | ||
e440a328 | 5460 | switch (this->op_) |
5461 | { | |
e440a328 | 5462 | case OPERATOR_EQEQ: |
5463 | case OPERATOR_NOTEQ: | |
5464 | case OPERATOR_LT: | |
5465 | case OPERATOR_LE: | |
5466 | case OPERATOR_GT: | |
5467 | case OPERATOR_GE: | |
e90c9dfc | 5468 | if (this->type_ == NULL) |
5469 | this->type_ = Type::make_boolean_type(); | |
5470 | return this->type_; | |
e440a328 | 5471 | |
5472 | case OPERATOR_PLUS: | |
5473 | case OPERATOR_MINUS: | |
5474 | case OPERATOR_OR: | |
5475 | case OPERATOR_XOR: | |
5476 | case OPERATOR_MULT: | |
5477 | case OPERATOR_DIV: | |
5478 | case OPERATOR_MOD: | |
5479 | case OPERATOR_AND: | |
5480 | case OPERATOR_BITCLEAR: | |
e90c9dfc | 5481 | case OPERATOR_OROR: |
5482 | case OPERATOR_ANDAND: | |
e440a328 | 5483 | { |
0c77715b | 5484 | Type* type; |
5485 | if (!Binary_expression::operation_type(this->op_, | |
5486 | this->left_->type(), | |
5487 | this->right_->type(), | |
5488 | &type)) | |
5489 | return Type::make_error_type(); | |
5490 | return type; | |
e440a328 | 5491 | } |
5492 | ||
5493 | case OPERATOR_LSHIFT: | |
5494 | case OPERATOR_RSHIFT: | |
5495 | return this->left_->type(); | |
5496 | ||
5497 | default: | |
c3e6f413 | 5498 | go_unreachable(); |
e440a328 | 5499 | } |
5500 | } | |
5501 | ||
5502 | // Set type for a binary expression. | |
5503 | ||
5504 | void | |
5505 | Binary_expression::do_determine_type(const Type_context* context) | |
5506 | { | |
5507 | Type* tleft = this->left_->type(); | |
5508 | Type* tright = this->right_->type(); | |
5509 | ||
5510 | // Both sides should have the same type, except for the shift | |
5511 | // operations. For a comparison, we should ignore the incoming | |
5512 | // type. | |
5513 | ||
5514 | bool is_shift_op = (this->op_ == OPERATOR_LSHIFT | |
5515 | || this->op_ == OPERATOR_RSHIFT); | |
5516 | ||
5517 | bool is_comparison = (this->op_ == OPERATOR_EQEQ | |
5518 | || this->op_ == OPERATOR_NOTEQ | |
5519 | || this->op_ == OPERATOR_LT | |
5520 | || this->op_ == OPERATOR_LE | |
5521 | || this->op_ == OPERATOR_GT | |
5522 | || this->op_ == OPERATOR_GE); | |
5523 | ||
c999c2a7 | 5524 | // For constant expressions, the context of the result is not useful in |
5525 | // determining the types of the operands. It is only legal to use abstract | |
5526 | // boolean, numeric, and string constants as operands where it is legal to | |
5527 | // use non-abstract boolean, numeric, and string constants, respectively. | |
5528 | // Any issues with the operation will be resolved in the check_types pass. | |
5529 | bool is_constant_expr = (this->left_->is_constant() | |
5530 | && this->right_->is_constant()); | |
5531 | ||
e440a328 | 5532 | Type_context subcontext(*context); |
5533 | ||
5534 | if (is_comparison) | |
5535 | { | |
5536 | // In a comparison, the context does not determine the types of | |
5537 | // the operands. | |
5538 | subcontext.type = NULL; | |
5539 | } | |
5540 | ||
5541 | // Set the context for the left hand operand. | |
5542 | if (is_shift_op) | |
5543 | { | |
b40dc774 | 5544 | // The right hand operand of a shift plays no role in |
5545 | // determining the type of the left hand operand. | |
e440a328 | 5546 | } |
5547 | else if (!tleft->is_abstract()) | |
5548 | subcontext.type = tleft; | |
5549 | else if (!tright->is_abstract()) | |
5550 | subcontext.type = tright; | |
5551 | else if (subcontext.type == NULL) | |
5552 | { | |
5553 | if ((tleft->integer_type() != NULL && tright->integer_type() != NULL) | |
5554 | || (tleft->float_type() != NULL && tright->float_type() != NULL) | |
5555 | || (tleft->complex_type() != NULL && tright->complex_type() != NULL)) | |
5556 | { | |
5557 | // Both sides have an abstract integer, abstract float, or | |
5558 | // abstract complex type. Just let CONTEXT determine | |
5559 | // whether they may remain abstract or not. | |
5560 | } | |
5561 | else if (tleft->complex_type() != NULL) | |
5562 | subcontext.type = tleft; | |
5563 | else if (tright->complex_type() != NULL) | |
5564 | subcontext.type = tright; | |
5565 | else if (tleft->float_type() != NULL) | |
5566 | subcontext.type = tleft; | |
5567 | else if (tright->float_type() != NULL) | |
5568 | subcontext.type = tright; | |
5569 | else | |
5570 | subcontext.type = tleft; | |
f58a23ae | 5571 | |
5572 | if (subcontext.type != NULL && !context->may_be_abstract) | |
5573 | subcontext.type = subcontext.type->make_non_abstract_type(); | |
e440a328 | 5574 | } |
5575 | ||
c999c2a7 | 5576 | if (!is_constant_expr) |
5577 | this->left_->determine_type(&subcontext); | |
e440a328 | 5578 | |
e440a328 | 5579 | if (is_shift_op) |
5580 | { | |
b40dc774 | 5581 | // We may have inherited an unusable type for the shift operand. |
5582 | // Give a useful error if that happened. | |
5583 | if (tleft->is_abstract() | |
5584 | && subcontext.type != NULL | |
8ab6effb | 5585 | && !subcontext.may_be_abstract |
f6bc81e6 | 5586 | && subcontext.type->interface_type() == NULL |
8ab6effb | 5587 | && subcontext.type->integer_type() == NULL) |
b40dc774 | 5588 | this->report_error(("invalid context-determined non-integer type " |
8ab6effb | 5589 | "for left operand of shift")); |
b40dc774 | 5590 | |
5591 | // The context for the right hand operand is the same as for the | |
5592 | // left hand operand, except for a shift operator. | |
e440a328 | 5593 | subcontext.type = Type::lookup_integer_type("uint"); |
5594 | subcontext.may_be_abstract = false; | |
5595 | } | |
5596 | ||
c999c2a7 | 5597 | if (!is_constant_expr) |
5598 | this->right_->determine_type(&subcontext); | |
e90c9dfc | 5599 | |
5600 | if (is_comparison) | |
5601 | { | |
5602 | if (this->type_ != NULL && !this->type_->is_abstract()) | |
5603 | ; | |
5604 | else if (context->type != NULL && context->type->is_boolean_type()) | |
5605 | this->type_ = context->type; | |
5606 | else if (!context->may_be_abstract) | |
5607 | this->type_ = Type::lookup_bool_type(); | |
5608 | } | |
e440a328 | 5609 | } |
5610 | ||
5611 | // Report an error if the binary operator OP does not support TYPE. | |
be8b5eee | 5612 | // OTYPE is the type of the other operand. Return whether the |
5613 | // operation is OK. This should not be used for shift. | |
e440a328 | 5614 | |
5615 | bool | |
be8b5eee | 5616 | Binary_expression::check_operator_type(Operator op, Type* type, Type* otype, |
b13c66cd | 5617 | Location location) |
e440a328 | 5618 | { |
5619 | switch (op) | |
5620 | { | |
5621 | case OPERATOR_OROR: | |
5622 | case OPERATOR_ANDAND: | |
c999c2a7 | 5623 | if (!type->is_boolean_type() |
5624 | || !otype->is_boolean_type()) | |
e440a328 | 5625 | { |
631d5788 | 5626 | go_error_at(location, "expected boolean type"); |
e440a328 | 5627 | return false; |
5628 | } | |
5629 | break; | |
5630 | ||
5631 | case OPERATOR_EQEQ: | |
5632 | case OPERATOR_NOTEQ: | |
e9d3367e | 5633 | { |
5634 | std::string reason; | |
5635 | if (!Type::are_compatible_for_comparison(true, type, otype, &reason)) | |
5636 | { | |
631d5788 | 5637 | go_error_at(location, "%s", reason.c_str()); |
e9d3367e | 5638 | return false; |
5639 | } | |
5640 | } | |
e440a328 | 5641 | break; |
5642 | ||
5643 | case OPERATOR_LT: | |
5644 | case OPERATOR_LE: | |
5645 | case OPERATOR_GT: | |
5646 | case OPERATOR_GE: | |
e9d3367e | 5647 | { |
5648 | std::string reason; | |
5649 | if (!Type::are_compatible_for_comparison(false, type, otype, &reason)) | |
5650 | { | |
631d5788 | 5651 | go_error_at(location, "%s", reason.c_str()); |
e9d3367e | 5652 | return false; |
5653 | } | |
5654 | } | |
e440a328 | 5655 | break; |
5656 | ||
5657 | case OPERATOR_PLUS: | |
5658 | case OPERATOR_PLUSEQ: | |
c999c2a7 | 5659 | if ((!type->is_numeric_type() && !type->is_string_type()) |
5660 | || (!otype->is_numeric_type() && !otype->is_string_type())) | |
e440a328 | 5661 | { |
631d5788 | 5662 | go_error_at(location, |
e440a328 | 5663 | "expected integer, floating, complex, or string type"); |
5664 | return false; | |
5665 | } | |
5666 | break; | |
5667 | ||
5668 | case OPERATOR_MINUS: | |
5669 | case OPERATOR_MINUSEQ: | |
5670 | case OPERATOR_MULT: | |
5671 | case OPERATOR_MULTEQ: | |
5672 | case OPERATOR_DIV: | |
5673 | case OPERATOR_DIVEQ: | |
c999c2a7 | 5674 | if (!type->is_numeric_type() || !otype->is_numeric_type()) |
e440a328 | 5675 | { |
631d5788 | 5676 | go_error_at(location, "expected integer, floating, or complex type"); |
e440a328 | 5677 | return false; |
5678 | } | |
5679 | break; | |
5680 | ||
5681 | case OPERATOR_MOD: | |
5682 | case OPERATOR_MODEQ: | |
5683 | case OPERATOR_OR: | |
5684 | case OPERATOR_OREQ: | |
5685 | case OPERATOR_AND: | |
5686 | case OPERATOR_ANDEQ: | |
5687 | case OPERATOR_XOR: | |
5688 | case OPERATOR_XOREQ: | |
5689 | case OPERATOR_BITCLEAR: | |
5690 | case OPERATOR_BITCLEAREQ: | |
c999c2a7 | 5691 | if (type->integer_type() == NULL || otype->integer_type() == NULL) |
e440a328 | 5692 | { |
631d5788 | 5693 | go_error_at(location, "expected integer type"); |
e440a328 | 5694 | return false; |
5695 | } | |
5696 | break; | |
5697 | ||
5698 | default: | |
c3e6f413 | 5699 | go_unreachable(); |
e440a328 | 5700 | } |
5701 | ||
5702 | return true; | |
5703 | } | |
5704 | ||
5705 | // Check types. | |
5706 | ||
5707 | void | |
5708 | Binary_expression::do_check_types(Gogo*) | |
5709 | { | |
5f5fea79 | 5710 | if (this->classification() == EXPRESSION_ERROR) |
5711 | return; | |
5712 | ||
e440a328 | 5713 | Type* left_type = this->left_->type(); |
5714 | Type* right_type = this->right_->type(); | |
5c13bd80 | 5715 | if (left_type->is_error() || right_type->is_error()) |
9fe897ef | 5716 | { |
5717 | this->set_is_error(); | |
5718 | return; | |
5719 | } | |
e440a328 | 5720 | |
5721 | if (this->op_ == OPERATOR_EQEQ | |
5722 | || this->op_ == OPERATOR_NOTEQ | |
5723 | || this->op_ == OPERATOR_LT | |
5724 | || this->op_ == OPERATOR_LE | |
5725 | || this->op_ == OPERATOR_GT | |
5726 | || this->op_ == OPERATOR_GE) | |
5727 | { | |
907c5ecd | 5728 | if (left_type->is_nil_type() && right_type->is_nil_type()) |
5729 | { | |
5730 | this->report_error(_("invalid comparison of nil with nil")); | |
5731 | return; | |
5732 | } | |
e440a328 | 5733 | if (!Type::are_assignable(left_type, right_type, NULL) |
5734 | && !Type::are_assignable(right_type, left_type, NULL)) | |
5735 | { | |
5736 | this->report_error(_("incompatible types in binary expression")); | |
5737 | return; | |
5738 | } | |
5739 | if (!Binary_expression::check_operator_type(this->op_, left_type, | |
be8b5eee | 5740 | right_type, |
e440a328 | 5741 | this->location()) |
5742 | || !Binary_expression::check_operator_type(this->op_, right_type, | |
be8b5eee | 5743 | left_type, |
e440a328 | 5744 | this->location())) |
5745 | { | |
5746 | this->set_is_error(); | |
5747 | return; | |
5748 | } | |
5749 | } | |
5750 | else if (this->op_ != OPERATOR_LSHIFT && this->op_ != OPERATOR_RSHIFT) | |
5751 | { | |
5752 | if (!Type::are_compatible_for_binop(left_type, right_type)) | |
5753 | { | |
5754 | this->report_error(_("incompatible types in binary expression")); | |
5755 | return; | |
5756 | } | |
5757 | if (!Binary_expression::check_operator_type(this->op_, left_type, | |
be8b5eee | 5758 | right_type, |
e440a328 | 5759 | this->location())) |
5760 | { | |
5761 | this->set_is_error(); | |
5762 | return; | |
5763 | } | |
5c65b19d | 5764 | if (this->op_ == OPERATOR_DIV || this->op_ == OPERATOR_MOD) |
5765 | { | |
5766 | // Division by a zero integer constant is an error. | |
5767 | Numeric_constant rconst; | |
5768 | unsigned long rval; | |
5769 | if (left_type->integer_type() != NULL | |
5770 | && this->right_->numeric_constant_value(&rconst) | |
5771 | && rconst.to_unsigned_long(&rval) == Numeric_constant::NC_UL_VALID | |
5772 | && rval == 0) | |
5773 | { | |
5774 | this->report_error(_("integer division by zero")); | |
5775 | return; | |
5776 | } | |
5777 | } | |
e440a328 | 5778 | } |
5779 | else | |
5780 | { | |
5781 | if (left_type->integer_type() == NULL) | |
5782 | this->report_error(_("shift of non-integer operand")); | |
5783 | ||
6b5e0fac | 5784 | if (right_type->is_string_type()) |
5785 | this->report_error(_("shift count not unsigned integer")); | |
5786 | else if (!right_type->is_abstract() | |
e440a328 | 5787 | && (right_type->integer_type() == NULL |
5788 | || !right_type->integer_type()->is_unsigned())) | |
5789 | this->report_error(_("shift count not unsigned integer")); | |
5790 | else | |
5791 | { | |
0c77715b | 5792 | Numeric_constant nc; |
5793 | if (this->right_->numeric_constant_value(&nc)) | |
e440a328 | 5794 | { |
0c77715b | 5795 | mpz_t val; |
5796 | if (!nc.to_int(&val)) | |
5797 | this->report_error(_("shift count not unsigned integer")); | |
5798 | else | |
a4eba91b | 5799 | { |
0c77715b | 5800 | if (mpz_sgn(val) < 0) |
5801 | { | |
5802 | this->report_error(_("negative shift count")); | |
0c77715b | 5803 | Location rloc = this->right_->location(); |
e67508fa | 5804 | this->right_ = Expression::make_integer_ul(0, right_type, |
5805 | rloc); | |
0c77715b | 5806 | } |
5807 | mpz_clear(val); | |
a4eba91b | 5808 | } |
e440a328 | 5809 | } |
e440a328 | 5810 | } |
5811 | } | |
5812 | } | |
5813 | ||
ea664253 | 5814 | // Get the backend representation for a binary expression. |
e440a328 | 5815 | |
ea664253 | 5816 | Bexpression* |
5817 | Binary_expression::do_get_backend(Translate_context* context) | |
e440a328 | 5818 | { |
1b1f2abf | 5819 | Gogo* gogo = context->gogo(); |
a32698ee | 5820 | Location loc = this->location(); |
5821 | Type* left_type = this->left_->type(); | |
5822 | Type* right_type = this->right_->type(); | |
1b1f2abf | 5823 | |
e440a328 | 5824 | bool use_left_type = true; |
5825 | bool is_shift_op = false; | |
29a2d1d8 | 5826 | bool is_idiv_op = false; |
e440a328 | 5827 | switch (this->op_) |
5828 | { | |
5829 | case OPERATOR_EQEQ: | |
5830 | case OPERATOR_NOTEQ: | |
5831 | case OPERATOR_LT: | |
5832 | case OPERATOR_LE: | |
5833 | case OPERATOR_GT: | |
5834 | case OPERATOR_GE: | |
ea664253 | 5835 | return Expression::comparison(context, this->type_, this->op_, |
5836 | this->left_, this->right_, loc); | |
e440a328 | 5837 | |
5838 | case OPERATOR_OROR: | |
e440a328 | 5839 | case OPERATOR_ANDAND: |
e440a328 | 5840 | use_left_type = false; |
5841 | break; | |
5842 | case OPERATOR_PLUS: | |
e440a328 | 5843 | case OPERATOR_MINUS: |
e440a328 | 5844 | case OPERATOR_OR: |
e440a328 | 5845 | case OPERATOR_XOR: |
e440a328 | 5846 | case OPERATOR_MULT: |
e440a328 | 5847 | break; |
5848 | case OPERATOR_DIV: | |
a32698ee | 5849 | if (left_type->float_type() != NULL || left_type->complex_type() != NULL) |
5850 | break; | |
729f8831 | 5851 | // Fall through. |
e440a328 | 5852 | case OPERATOR_MOD: |
29a2d1d8 | 5853 | is_idiv_op = true; |
e440a328 | 5854 | break; |
5855 | case OPERATOR_LSHIFT: | |
e440a328 | 5856 | case OPERATOR_RSHIFT: |
e440a328 | 5857 | is_shift_op = true; |
5858 | break; | |
e440a328 | 5859 | case OPERATOR_BITCLEAR: |
a32698ee | 5860 | this->right_ = Expression::make_unary(OPERATOR_XOR, this->right_, loc); |
5861 | case OPERATOR_AND: | |
e440a328 | 5862 | break; |
5863 | default: | |
c3e6f413 | 5864 | go_unreachable(); |
e440a328 | 5865 | } |
5866 | ||
736a16ba | 5867 | // The only binary operation for string is +, and that should have |
5868 | // been converted to a String_concat_expression in do_lower. | |
5869 | go_assert(!left_type->is_string_type()); | |
a32698ee | 5870 | |
5871 | // For complex division Go might want slightly different results than the | |
5872 | // backend implementation provides, so we have our own runtime routine. | |
1850e20c | 5873 | if (this->op_ == OPERATOR_DIV && this->left_->type()->complex_type() != NULL) |
5874 | { | |
a32698ee | 5875 | Runtime::Function complex_code; |
1850e20c | 5876 | switch (this->left_->type()->complex_type()->bits()) |
5877 | { | |
5878 | case 64: | |
a32698ee | 5879 | complex_code = Runtime::COMPLEX64_DIV; |
1850e20c | 5880 | break; |
5881 | case 128: | |
a32698ee | 5882 | complex_code = Runtime::COMPLEX128_DIV; |
1850e20c | 5883 | break; |
5884 | default: | |
5885 | go_unreachable(); | |
5886 | } | |
a32698ee | 5887 | Expression* complex_div = |
5888 | Runtime::make_call(complex_code, loc, 2, this->left_, this->right_); | |
ea664253 | 5889 | return complex_div->get_backend(context); |
1850e20c | 5890 | } |
5891 | ||
ea664253 | 5892 | Bexpression* left = this->left_->get_backend(context); |
5893 | Bexpression* right = this->right_->get_backend(context); | |
e440a328 | 5894 | |
a32698ee | 5895 | Type* type = use_left_type ? left_type : right_type; |
5896 | Btype* btype = type->get_backend(gogo); | |
5897 | ||
5898 | Bexpression* ret = | |
5899 | gogo->backend()->binary_expression(this->op_, left, right, loc); | |
5900 | ret = gogo->backend()->convert_expression(btype, ret, loc); | |
e440a328 | 5901 | |
a32698ee | 5902 | // Initialize overflow constants. |
5903 | Bexpression* overflow; | |
5904 | mpz_t zero; | |
5905 | mpz_init_set_ui(zero, 0UL); | |
5906 | mpz_t one; | |
5907 | mpz_init_set_ui(one, 1UL); | |
5908 | mpz_t neg_one; | |
5909 | mpz_init_set_si(neg_one, -1); | |
e440a328 | 5910 | |
a32698ee | 5911 | Btype* left_btype = left_type->get_backend(gogo); |
5912 | Btype* right_btype = right_type->get_backend(gogo); | |
e440a328 | 5913 | |
5914 | // In Go, a shift larger than the size of the type is well-defined. | |
a32698ee | 5915 | // This is not true in C, so we need to insert a conditional. |
e440a328 | 5916 | if (is_shift_op) |
5917 | { | |
a32698ee | 5918 | go_assert(left_type->integer_type() != NULL); |
e440a328 | 5919 | |
a32698ee | 5920 | mpz_t bitsval; |
5921 | int bits = left_type->integer_type()->bits(); | |
5922 | mpz_init_set_ui(bitsval, bits); | |
5923 | Bexpression* bits_expr = | |
5924 | gogo->backend()->integer_constant_expression(right_btype, bitsval); | |
5925 | Bexpression* compare = | |
5926 | gogo->backend()->binary_expression(OPERATOR_LT, | |
5927 | right, bits_expr, loc); | |
e440a328 | 5928 | |
a32698ee | 5929 | Bexpression* zero_expr = |
5930 | gogo->backend()->integer_constant_expression(left_btype, zero); | |
5931 | overflow = zero_expr; | |
e440a328 | 5932 | if (this->op_ == OPERATOR_RSHIFT |
a32698ee | 5933 | && !left_type->integer_type()->is_unsigned()) |
e440a328 | 5934 | { |
a32698ee | 5935 | Bexpression* neg_expr = |
5936 | gogo->backend()->binary_expression(OPERATOR_LT, left, | |
5937 | zero_expr, loc); | |
5938 | Bexpression* neg_one_expr = | |
5939 | gogo->backend()->integer_constant_expression(left_btype, neg_one); | |
5940 | overflow = gogo->backend()->conditional_expression(btype, neg_expr, | |
5941 | neg_one_expr, | |
5942 | zero_expr, loc); | |
29a2d1d8 | 5943 | } |
a32698ee | 5944 | ret = gogo->backend()->conditional_expression(btype, compare, ret, |
5945 | overflow, loc); | |
5946 | mpz_clear(bitsval); | |
29a2d1d8 | 5947 | } |
5948 | ||
5949 | // Add checks for division by zero and division overflow as needed. | |
5950 | if (is_idiv_op) | |
5951 | { | |
5c3f3470 | 5952 | if (gogo->check_divide_by_zero()) |
29a2d1d8 | 5953 | { |
5954 | // right == 0 | |
a32698ee | 5955 | Bexpression* zero_expr = |
5956 | gogo->backend()->integer_constant_expression(right_btype, zero); | |
5957 | Bexpression* check = | |
5958 | gogo->backend()->binary_expression(OPERATOR_EQEQ, | |
5959 | right, zero_expr, loc); | |
29a2d1d8 | 5960 | |
a32698ee | 5961 | // __go_runtime_error(RUNTIME_ERROR_DIVISION_BY_ZERO) |
29a2d1d8 | 5962 | int errcode = RUNTIME_ERROR_DIVISION_BY_ZERO; |
ea664253 | 5963 | Bexpression* crash = gogo->runtime_error(errcode, |
5964 | loc)->get_backend(context); | |
29a2d1d8 | 5965 | |
5966 | // right == 0 ? (__go_runtime_error(...), 0) : ret | |
ea664253 | 5967 | ret = gogo->backend()->conditional_expression(btype, check, crash, |
5968 | ret, loc); | |
b13c66cd | 5969 | } |
5970 | ||
5c3f3470 | 5971 | if (gogo->check_divide_overflow()) |
29a2d1d8 | 5972 | { |
5973 | // right == -1 | |
5974 | // FIXME: It would be nice to say that this test is expected | |
5975 | // to return false. | |
a32698ee | 5976 | |
5977 | Bexpression* neg_one_expr = | |
5978 | gogo->backend()->integer_constant_expression(right_btype, neg_one); | |
5979 | Bexpression* check = | |
5980 | gogo->backend()->binary_expression(OPERATOR_EQEQ, | |
5981 | right, neg_one_expr, loc); | |
5982 | ||
5983 | Bexpression* zero_expr = | |
5984 | gogo->backend()->integer_constant_expression(btype, zero); | |
5985 | Bexpression* one_expr = | |
5986 | gogo->backend()->integer_constant_expression(btype, one); | |
5987 | ||
5988 | if (type->integer_type()->is_unsigned()) | |
29a2d1d8 | 5989 | { |
5990 | // An unsigned -1 is the largest possible number, so | |
5991 | // dividing is always 1 or 0. | |
a32698ee | 5992 | |
5993 | Bexpression* cmp = | |
5994 | gogo->backend()->binary_expression(OPERATOR_EQEQ, | |
5995 | left, right, loc); | |
29a2d1d8 | 5996 | if (this->op_ == OPERATOR_DIV) |
a32698ee | 5997 | overflow = |
5998 | gogo->backend()->conditional_expression(btype, cmp, | |
5999 | one_expr, zero_expr, | |
6000 | loc); | |
29a2d1d8 | 6001 | else |
a32698ee | 6002 | overflow = |
6003 | gogo->backend()->conditional_expression(btype, cmp, | |
6004 | zero_expr, left, | |
6005 | loc); | |
29a2d1d8 | 6006 | } |
6007 | else | |
6008 | { | |
6009 | // Computing left / -1 is the same as computing - left, | |
6010 | // which does not overflow since Go sets -fwrapv. | |
6011 | if (this->op_ == OPERATOR_DIV) | |
a32698ee | 6012 | { |
6013 | Expression* negate_expr = | |
6014 | Expression::make_unary(OPERATOR_MINUS, this->left_, loc); | |
ea664253 | 6015 | overflow = negate_expr->get_backend(context); |
a32698ee | 6016 | } |
29a2d1d8 | 6017 | else |
a32698ee | 6018 | overflow = zero_expr; |
29a2d1d8 | 6019 | } |
a32698ee | 6020 | overflow = gogo->backend()->convert_expression(btype, overflow, loc); |
29a2d1d8 | 6021 | |
6022 | // right == -1 ? - left : ret | |
a32698ee | 6023 | ret = gogo->backend()->conditional_expression(btype, check, overflow, |
6024 | ret, loc); | |
29a2d1d8 | 6025 | } |
e440a328 | 6026 | } |
6027 | ||
a32698ee | 6028 | mpz_clear(zero); |
6029 | mpz_clear(one); | |
6030 | mpz_clear(neg_one); | |
ea664253 | 6031 | return ret; |
e440a328 | 6032 | } |
6033 | ||
6034 | // Export a binary expression. | |
6035 | ||
6036 | void | |
6037 | Binary_expression::do_export(Export* exp) const | |
6038 | { | |
6039 | exp->write_c_string("("); | |
6040 | this->left_->export_expression(exp); | |
6041 | switch (this->op_) | |
6042 | { | |
6043 | case OPERATOR_OROR: | |
6044 | exp->write_c_string(" || "); | |
6045 | break; | |
6046 | case OPERATOR_ANDAND: | |
6047 | exp->write_c_string(" && "); | |
6048 | break; | |
6049 | case OPERATOR_EQEQ: | |
6050 | exp->write_c_string(" == "); | |
6051 | break; | |
6052 | case OPERATOR_NOTEQ: | |
6053 | exp->write_c_string(" != "); | |
6054 | break; | |
6055 | case OPERATOR_LT: | |
6056 | exp->write_c_string(" < "); | |
6057 | break; | |
6058 | case OPERATOR_LE: | |
6059 | exp->write_c_string(" <= "); | |
6060 | break; | |
6061 | case OPERATOR_GT: | |
6062 | exp->write_c_string(" > "); | |
6063 | break; | |
6064 | case OPERATOR_GE: | |
6065 | exp->write_c_string(" >= "); | |
6066 | break; | |
6067 | case OPERATOR_PLUS: | |
6068 | exp->write_c_string(" + "); | |
6069 | break; | |
6070 | case OPERATOR_MINUS: | |
6071 | exp->write_c_string(" - "); | |
6072 | break; | |
6073 | case OPERATOR_OR: | |
6074 | exp->write_c_string(" | "); | |
6075 | break; | |
6076 | case OPERATOR_XOR: | |
6077 | exp->write_c_string(" ^ "); | |
6078 | break; | |
6079 | case OPERATOR_MULT: | |
6080 | exp->write_c_string(" * "); | |
6081 | break; | |
6082 | case OPERATOR_DIV: | |
6083 | exp->write_c_string(" / "); | |
6084 | break; | |
6085 | case OPERATOR_MOD: | |
6086 | exp->write_c_string(" % "); | |
6087 | break; | |
6088 | case OPERATOR_LSHIFT: | |
6089 | exp->write_c_string(" << "); | |
6090 | break; | |
6091 | case OPERATOR_RSHIFT: | |
6092 | exp->write_c_string(" >> "); | |
6093 | break; | |
6094 | case OPERATOR_AND: | |
6095 | exp->write_c_string(" & "); | |
6096 | break; | |
6097 | case OPERATOR_BITCLEAR: | |
6098 | exp->write_c_string(" &^ "); | |
6099 | break; | |
6100 | default: | |
c3e6f413 | 6101 | go_unreachable(); |
e440a328 | 6102 | } |
6103 | this->right_->export_expression(exp); | |
6104 | exp->write_c_string(")"); | |
6105 | } | |
6106 | ||
6107 | // Import a binary expression. | |
6108 | ||
6109 | Expression* | |
6110 | Binary_expression::do_import(Import* imp) | |
6111 | { | |
6112 | imp->require_c_string("("); | |
6113 | ||
6114 | Expression* left = Expression::import_expression(imp); | |
6115 | ||
6116 | Operator op; | |
6117 | if (imp->match_c_string(" || ")) | |
6118 | { | |
6119 | op = OPERATOR_OROR; | |
6120 | imp->advance(4); | |
6121 | } | |
6122 | else if (imp->match_c_string(" && ")) | |
6123 | { | |
6124 | op = OPERATOR_ANDAND; | |
6125 | imp->advance(4); | |
6126 | } | |
6127 | else if (imp->match_c_string(" == ")) | |
6128 | { | |
6129 | op = OPERATOR_EQEQ; | |
6130 | imp->advance(4); | |
6131 | } | |
6132 | else if (imp->match_c_string(" != ")) | |
6133 | { | |
6134 | op = OPERATOR_NOTEQ; | |
6135 | imp->advance(4); | |
6136 | } | |
6137 | else if (imp->match_c_string(" < ")) | |
6138 | { | |
6139 | op = OPERATOR_LT; | |
6140 | imp->advance(3); | |
6141 | } | |
6142 | else if (imp->match_c_string(" <= ")) | |
6143 | { | |
6144 | op = OPERATOR_LE; | |
6145 | imp->advance(4); | |
6146 | } | |
6147 | else if (imp->match_c_string(" > ")) | |
6148 | { | |
6149 | op = OPERATOR_GT; | |
6150 | imp->advance(3); | |
6151 | } | |
6152 | else if (imp->match_c_string(" >= ")) | |
6153 | { | |
6154 | op = OPERATOR_GE; | |
6155 | imp->advance(4); | |
6156 | } | |
6157 | else if (imp->match_c_string(" + ")) | |
6158 | { | |
6159 | op = OPERATOR_PLUS; | |
6160 | imp->advance(3); | |
6161 | } | |
6162 | else if (imp->match_c_string(" - ")) | |
6163 | { | |
6164 | op = OPERATOR_MINUS; | |
6165 | imp->advance(3); | |
6166 | } | |
6167 | else if (imp->match_c_string(" | ")) | |
6168 | { | |
6169 | op = OPERATOR_OR; | |
6170 | imp->advance(3); | |
6171 | } | |
6172 | else if (imp->match_c_string(" ^ ")) | |
6173 | { | |
6174 | op = OPERATOR_XOR; | |
6175 | imp->advance(3); | |
6176 | } | |
6177 | else if (imp->match_c_string(" * ")) | |
6178 | { | |
6179 | op = OPERATOR_MULT; | |
6180 | imp->advance(3); | |
6181 | } | |
6182 | else if (imp->match_c_string(" / ")) | |
6183 | { | |
6184 | op = OPERATOR_DIV; | |
6185 | imp->advance(3); | |
6186 | } | |
6187 | else if (imp->match_c_string(" % ")) | |
6188 | { | |
6189 | op = OPERATOR_MOD; | |
6190 | imp->advance(3); | |
6191 | } | |
6192 | else if (imp->match_c_string(" << ")) | |
6193 | { | |
6194 | op = OPERATOR_LSHIFT; | |
6195 | imp->advance(4); | |
6196 | } | |
6197 | else if (imp->match_c_string(" >> ")) | |
6198 | { | |
6199 | op = OPERATOR_RSHIFT; | |
6200 | imp->advance(4); | |
6201 | } | |
6202 | else if (imp->match_c_string(" & ")) | |
6203 | { | |
6204 | op = OPERATOR_AND; | |
6205 | imp->advance(3); | |
6206 | } | |
6207 | else if (imp->match_c_string(" &^ ")) | |
6208 | { | |
6209 | op = OPERATOR_BITCLEAR; | |
6210 | imp->advance(4); | |
6211 | } | |
6212 | else | |
6213 | { | |
631d5788 | 6214 | go_error_at(imp->location(), "unrecognized binary operator"); |
e440a328 | 6215 | return Expression::make_error(imp->location()); |
6216 | } | |
6217 | ||
6218 | Expression* right = Expression::import_expression(imp); | |
6219 | ||
6220 | imp->require_c_string(")"); | |
6221 | ||
6222 | return Expression::make_binary(op, left, right, imp->location()); | |
6223 | } | |
6224 | ||
d751bb78 | 6225 | // Dump ast representation of a binary expression. |
6226 | ||
6227 | void | |
6228 | Binary_expression::do_dump_expression(Ast_dump_context* ast_dump_context) const | |
6229 | { | |
6230 | ast_dump_context->ostream() << "("; | |
6231 | ast_dump_context->dump_expression(this->left_); | |
6232 | ast_dump_context->ostream() << " "; | |
6233 | ast_dump_context->dump_operator(this->op_); | |
6234 | ast_dump_context->ostream() << " "; | |
6235 | ast_dump_context->dump_expression(this->right_); | |
6236 | ast_dump_context->ostream() << ") "; | |
6237 | } | |
6238 | ||
e440a328 | 6239 | // Make a binary expression. |
6240 | ||
6241 | Expression* | |
6242 | Expression::make_binary(Operator op, Expression* left, Expression* right, | |
b13c66cd | 6243 | Location location) |
e440a328 | 6244 | { |
6245 | return new Binary_expression(op, left, right, location); | |
6246 | } | |
6247 | ||
6248 | // Implement a comparison. | |
6249 | ||
a32698ee | 6250 | Bexpression* |
6251 | Expression::comparison(Translate_context* context, Type* result_type, | |
6252 | Operator op, Expression* left, Expression* right, | |
6253 | Location location) | |
e440a328 | 6254 | { |
2387f644 | 6255 | Type* left_type = left->type(); |
6256 | Type* right_type = right->type(); | |
ceeb12d7 | 6257 | |
e67508fa | 6258 | Expression* zexpr = Expression::make_integer_ul(0, NULL, location); |
1b1f2abf | 6259 | |
15c67ee2 | 6260 | if (left_type->is_string_type() && right_type->is_string_type()) |
e440a328 | 6261 | { |
6098d6cb | 6262 | if (op == OPERATOR_EQEQ || op == OPERATOR_NOTEQ) |
6263 | { | |
6264 | left = Runtime::make_call(Runtime::EQSTRING, location, 2, | |
6265 | left, right); | |
6266 | right = Expression::make_boolean(true, location); | |
6267 | } | |
6268 | else | |
6269 | { | |
6270 | left = Runtime::make_call(Runtime::CMPSTRING, location, 2, | |
6271 | left, right); | |
6272 | right = zexpr; | |
6273 | } | |
e440a328 | 6274 | } |
15c67ee2 | 6275 | else if ((left_type->interface_type() != NULL |
6276 | && right_type->interface_type() == NULL | |
6277 | && !right_type->is_nil_type()) | |
6278 | || (left_type->interface_type() == NULL | |
6279 | && !left_type->is_nil_type() | |
6280 | && right_type->interface_type() != NULL)) | |
e440a328 | 6281 | { |
6282 | // Comparing an interface value to a non-interface value. | |
6283 | if (left_type->interface_type() == NULL) | |
6284 | { | |
6285 | std::swap(left_type, right_type); | |
2387f644 | 6286 | std::swap(left, right); |
e440a328 | 6287 | } |
6288 | ||
6289 | // The right operand is not an interface. We need to take its | |
6290 | // address if it is not a pointer. | |
ceeb12d7 | 6291 | Expression* pointer_arg = NULL; |
e440a328 | 6292 | if (right_type->points_to() != NULL) |
2387f644 | 6293 | pointer_arg = right; |
e440a328 | 6294 | else |
6295 | { | |
2387f644 | 6296 | go_assert(right->is_addressable()); |
6297 | pointer_arg = Expression::make_unary(OPERATOR_AND, right, | |
ceeb12d7 | 6298 | location); |
e440a328 | 6299 | } |
e440a328 | 6300 | |
2387f644 | 6301 | Expression* descriptor = |
6302 | Expression::make_type_descriptor(right_type, location); | |
6303 | left = | |
ceeb12d7 | 6304 | Runtime::make_call((left_type->interface_type()->is_empty() |
6098d6cb | 6305 | ? Runtime::EFACEVALEQ |
6306 | : Runtime::IFACEVALEQ), | |
2387f644 | 6307 | location, 3, left, descriptor, |
ceeb12d7 | 6308 | pointer_arg); |
6098d6cb | 6309 | go_assert(op == OPERATOR_EQEQ || op == OPERATOR_NOTEQ); |
6310 | right = Expression::make_boolean(true, location); | |
e440a328 | 6311 | } |
6312 | else if (left_type->interface_type() != NULL | |
6313 | && right_type->interface_type() != NULL) | |
6314 | { | |
ceeb12d7 | 6315 | Runtime::Function compare_function; |
739bad04 | 6316 | if (left_type->interface_type()->is_empty() |
6317 | && right_type->interface_type()->is_empty()) | |
6098d6cb | 6318 | compare_function = Runtime::EFACEEQ; |
739bad04 | 6319 | else if (!left_type->interface_type()->is_empty() |
6320 | && !right_type->interface_type()->is_empty()) | |
6098d6cb | 6321 | compare_function = Runtime::IFACEEQ; |
739bad04 | 6322 | else |
6323 | { | |
6324 | if (left_type->interface_type()->is_empty()) | |
6325 | { | |
739bad04 | 6326 | std::swap(left_type, right_type); |
2387f644 | 6327 | std::swap(left, right); |
739bad04 | 6328 | } |
c484d925 | 6329 | go_assert(!left_type->interface_type()->is_empty()); |
6330 | go_assert(right_type->interface_type()->is_empty()); | |
6098d6cb | 6331 | compare_function = Runtime::IFACEEFACEEQ; |
739bad04 | 6332 | } |
6333 | ||
2387f644 | 6334 | left = Runtime::make_call(compare_function, location, 2, left, right); |
6098d6cb | 6335 | go_assert(op == OPERATOR_EQEQ || op == OPERATOR_NOTEQ); |
6336 | right = Expression::make_boolean(true, location); | |
e440a328 | 6337 | } |
6338 | ||
6339 | if (left_type->is_nil_type() | |
6340 | && (op == OPERATOR_EQEQ || op == OPERATOR_NOTEQ)) | |
6341 | { | |
6342 | std::swap(left_type, right_type); | |
2387f644 | 6343 | std::swap(left, right); |
e440a328 | 6344 | } |
6345 | ||
6346 | if (right_type->is_nil_type()) | |
6347 | { | |
2387f644 | 6348 | right = Expression::make_nil(location); |
e440a328 | 6349 | if (left_type->array_type() != NULL |
6350 | && left_type->array_type()->length() == NULL) | |
6351 | { | |
6352 | Array_type* at = left_type->array_type(); | |
2387f644 | 6353 | left = at->get_value_pointer(context->gogo(), left); |
e440a328 | 6354 | } |
6355 | else if (left_type->interface_type() != NULL) | |
6356 | { | |
6357 | // An interface is nil if the first field is nil. | |
2387f644 | 6358 | left = Expression::make_field_reference(left, 0, location); |
e440a328 | 6359 | } |
6360 | } | |
6361 | ||
ea664253 | 6362 | Bexpression* left_bexpr = left->get_backend(context); |
6363 | Bexpression* right_bexpr = right->get_backend(context); | |
e90c9dfc | 6364 | |
a32698ee | 6365 | Gogo* gogo = context->gogo(); |
6366 | Bexpression* ret = gogo->backend()->binary_expression(op, left_bexpr, | |
6367 | right_bexpr, location); | |
6368 | if (result_type != NULL) | |
6369 | ret = gogo->backend()->convert_expression(result_type->get_backend(gogo), | |
6370 | ret, location); | |
e440a328 | 6371 | return ret; |
6372 | } | |
6373 | ||
736a16ba | 6374 | // Class String_concat_expression. |
6375 | ||
6376 | bool | |
6377 | String_concat_expression::do_is_constant() const | |
6378 | { | |
6379 | for (Expression_list::const_iterator pe = this->exprs_->begin(); | |
6380 | pe != this->exprs_->end(); | |
6381 | ++pe) | |
6382 | { | |
6383 | if (!(*pe)->is_constant()) | |
6384 | return false; | |
6385 | } | |
6386 | return true; | |
6387 | } | |
6388 | ||
6389 | bool | |
3ae06f68 | 6390 | String_concat_expression::do_is_static_initializer() const |
736a16ba | 6391 | { |
6392 | for (Expression_list::const_iterator pe = this->exprs_->begin(); | |
6393 | pe != this->exprs_->end(); | |
6394 | ++pe) | |
6395 | { | |
3ae06f68 | 6396 | if (!(*pe)->is_static_initializer()) |
736a16ba | 6397 | return false; |
6398 | } | |
6399 | return true; | |
6400 | } | |
6401 | ||
6402 | Type* | |
6403 | String_concat_expression::do_type() | |
6404 | { | |
6405 | Type* t = this->exprs_->front()->type(); | |
6406 | Expression_list::iterator pe = this->exprs_->begin(); | |
6407 | ++pe; | |
6408 | for (; pe != this->exprs_->end(); ++pe) | |
6409 | { | |
6410 | Type* t1; | |
6411 | if (!Binary_expression::operation_type(OPERATOR_PLUS, t, | |
6412 | (*pe)->type(), | |
6413 | &t1)) | |
6414 | return Type::make_error_type(); | |
6415 | t = t1; | |
6416 | } | |
6417 | return t; | |
6418 | } | |
6419 | ||
6420 | void | |
6421 | String_concat_expression::do_determine_type(const Type_context* context) | |
6422 | { | |
6423 | Type_context subcontext(*context); | |
6424 | for (Expression_list::iterator pe = this->exprs_->begin(); | |
6425 | pe != this->exprs_->end(); | |
6426 | ++pe) | |
6427 | { | |
6428 | Type* t = (*pe)->type(); | |
6429 | if (!t->is_abstract()) | |
6430 | { | |
6431 | subcontext.type = t; | |
6432 | break; | |
6433 | } | |
6434 | } | |
6435 | if (subcontext.type == NULL) | |
6436 | subcontext.type = this->exprs_->front()->type(); | |
6437 | for (Expression_list::iterator pe = this->exprs_->begin(); | |
6438 | pe != this->exprs_->end(); | |
6439 | ++pe) | |
6440 | (*pe)->determine_type(&subcontext); | |
6441 | } | |
6442 | ||
6443 | void | |
6444 | String_concat_expression::do_check_types(Gogo*) | |
6445 | { | |
6446 | if (this->is_error_expression()) | |
6447 | return; | |
6448 | Type* t = this->exprs_->front()->type(); | |
6449 | if (t->is_error()) | |
6450 | { | |
6451 | this->set_is_error(); | |
6452 | return; | |
6453 | } | |
6454 | Expression_list::iterator pe = this->exprs_->begin(); | |
6455 | ++pe; | |
6456 | for (; pe != this->exprs_->end(); ++pe) | |
6457 | { | |
6458 | Type* t1 = (*pe)->type(); | |
6459 | if (!Type::are_compatible_for_binop(t, t1)) | |
6460 | { | |
6461 | this->report_error("incompatible types in binary expression"); | |
6462 | return; | |
6463 | } | |
6464 | if (!Binary_expression::check_operator_type(OPERATOR_PLUS, t, t1, | |
6465 | this->location())) | |
6466 | { | |
6467 | this->set_is_error(); | |
6468 | return; | |
6469 | } | |
6470 | } | |
6471 | } | |
6472 | ||
6473 | Expression* | |
6474 | String_concat_expression::do_flatten(Gogo*, Named_object*, | |
6475 | Statement_inserter*) | |
6476 | { | |
6477 | if (this->is_error_expression()) | |
6478 | return this; | |
6479 | Location loc = this->location(); | |
6480 | Type* type = this->type(); | |
6481 | Expression* nil_arg = Expression::make_nil(loc); | |
6482 | Expression* call; | |
6483 | switch (this->exprs_->size()) | |
6484 | { | |
6485 | case 0: case 1: | |
6486 | go_unreachable(); | |
6487 | ||
6488 | case 2: case 3: case 4: case 5: | |
6489 | { | |
6490 | Expression* len = Expression::make_integer_ul(this->exprs_->size(), | |
6491 | NULL, loc); | |
6492 | Array_type* arg_type = Type::make_array_type(type, len); | |
6493 | arg_type->set_is_array_incomparable(); | |
6494 | Expression* arg = | |
6495 | Expression::make_array_composite_literal(arg_type, this->exprs_, | |
6496 | loc); | |
6497 | Runtime::Function code; | |
6498 | switch (this->exprs_->size()) | |
6499 | { | |
6500 | default: | |
6501 | go_unreachable(); | |
6502 | case 2: | |
6503 | code = Runtime::CONCATSTRING2; | |
6504 | break; | |
6505 | case 3: | |
6506 | code = Runtime::CONCATSTRING3; | |
6507 | break; | |
6508 | case 4: | |
6509 | code = Runtime::CONCATSTRING4; | |
6510 | break; | |
6511 | case 5: | |
6512 | code = Runtime::CONCATSTRING5; | |
6513 | break; | |
6514 | } | |
6515 | call = Runtime::make_call(code, loc, 2, nil_arg, arg); | |
6516 | } | |
6517 | break; | |
6518 | ||
6519 | default: | |
6520 | { | |
6521 | Type* arg_type = Type::make_array_type(type, NULL); | |
6522 | Slice_construction_expression* sce = | |
6523 | Expression::make_slice_composite_literal(arg_type, this->exprs_, | |
6524 | loc); | |
6525 | sce->set_storage_does_not_escape(); | |
6526 | call = Runtime::make_call(Runtime::CONCATSTRINGS, loc, 2, nil_arg, | |
6527 | sce); | |
6528 | } | |
6529 | break; | |
6530 | } | |
6531 | ||
6532 | return Expression::make_cast(type, call, loc); | |
6533 | } | |
6534 | ||
6535 | void | |
6536 | String_concat_expression::do_dump_expression( | |
6537 | Ast_dump_context* ast_dump_context) const | |
6538 | { | |
6539 | ast_dump_context->ostream() << "concat("; | |
6540 | ast_dump_context->dump_expression_list(this->exprs_, false); | |
6541 | ast_dump_context->ostream() << ")"; | |
6542 | } | |
6543 | ||
6544 | Expression* | |
6545 | Expression::make_string_concat(Expression_list* exprs) | |
6546 | { | |
6547 | return new String_concat_expression(exprs); | |
6548 | } | |
6549 | ||
e440a328 | 6550 | // Class Bound_method_expression. |
6551 | ||
6552 | // Traversal. | |
6553 | ||
6554 | int | |
6555 | Bound_method_expression::do_traverse(Traverse* traverse) | |
6556 | { | |
e0659c9e | 6557 | return Expression::traverse(&this->expr_, traverse); |
e440a328 | 6558 | } |
6559 | ||
6560 | // Return the type of a bound method expression. The type of this | |
0afbb937 | 6561 | // object is simply the type of the method with no receiver. |
e440a328 | 6562 | |
6563 | Type* | |
6564 | Bound_method_expression::do_type() | |
6565 | { | |
0afbb937 | 6566 | Named_object* fn = this->method_->named_object(); |
6567 | Function_type* fntype; | |
6568 | if (fn->is_function()) | |
6569 | fntype = fn->func_value()->type(); | |
6570 | else if (fn->is_function_declaration()) | |
6571 | fntype = fn->func_declaration_value()->type(); | |
e0659c9e | 6572 | else |
6573 | return Type::make_error_type(); | |
0afbb937 | 6574 | return fntype->copy_without_receiver(); |
e440a328 | 6575 | } |
6576 | ||
6577 | // Determine the types of a method expression. | |
6578 | ||
6579 | void | |
6580 | Bound_method_expression::do_determine_type(const Type_context*) | |
6581 | { | |
0afbb937 | 6582 | Named_object* fn = this->method_->named_object(); |
6583 | Function_type* fntype; | |
6584 | if (fn->is_function()) | |
6585 | fntype = fn->func_value()->type(); | |
6586 | else if (fn->is_function_declaration()) | |
6587 | fntype = fn->func_declaration_value()->type(); | |
6588 | else | |
6589 | fntype = NULL; | |
e440a328 | 6590 | if (fntype == NULL || !fntype->is_method()) |
6591 | this->expr_->determine_type_no_context(); | |
6592 | else | |
6593 | { | |
6594 | Type_context subcontext(fntype->receiver()->type(), false); | |
6595 | this->expr_->determine_type(&subcontext); | |
6596 | } | |
6597 | } | |
6598 | ||
6599 | // Check the types of a method expression. | |
6600 | ||
6601 | void | |
6602 | Bound_method_expression::do_check_types(Gogo*) | |
6603 | { | |
0afbb937 | 6604 | Named_object* fn = this->method_->named_object(); |
6605 | if (!fn->is_function() && !fn->is_function_declaration()) | |
6606 | { | |
6607 | this->report_error(_("object is not a method")); | |
6608 | return; | |
6609 | } | |
6610 | ||
6611 | Function_type* fntype; | |
6612 | if (fn->is_function()) | |
6613 | fntype = fn->func_value()->type(); | |
6614 | else if (fn->is_function_declaration()) | |
6615 | fntype = fn->func_declaration_value()->type(); | |
e440a328 | 6616 | else |
0afbb937 | 6617 | go_unreachable(); |
6618 | Type* rtype = fntype->receiver()->type()->deref(); | |
6619 | Type* etype = (this->expr_type_ != NULL | |
6620 | ? this->expr_type_ | |
6621 | : this->expr_->type()); | |
6622 | etype = etype->deref(); | |
6623 | if (!Type::are_identical(rtype, etype, true, NULL)) | |
6624 | this->report_error(_("method type does not match object type")); | |
6625 | } | |
6626 | ||
6627 | // If a bound method expression is not simply called, then it is | |
6628 | // represented as a closure. The closure will hold a single variable, | |
6629 | // the receiver to pass to the method. The function will be a simple | |
6630 | // thunk that pulls that value from the closure and calls the method | |
6631 | // with the remaining arguments. | |
6632 | // | |
6633 | // Because method values are not common, we don't build all thunks for | |
6634 | // every methods, but instead only build them as we need them. In | |
6635 | // particular, we even build them on demand for methods defined in | |
6636 | // other packages. | |
6637 | ||
6638 | Bound_method_expression::Method_value_thunks | |
6639 | Bound_method_expression::method_value_thunks; | |
6640 | ||
6641 | // Find or create the thunk for METHOD. | |
6642 | ||
6643 | Named_object* | |
6644 | Bound_method_expression::create_thunk(Gogo* gogo, const Method* method, | |
6645 | Named_object* fn) | |
6646 | { | |
6647 | std::pair<Named_object*, Named_object*> val(fn, NULL); | |
6648 | std::pair<Method_value_thunks::iterator, bool> ins = | |
6649 | Bound_method_expression::method_value_thunks.insert(val); | |
6650 | if (!ins.second) | |
6651 | { | |
6652 | // We have seen this method before. | |
6653 | go_assert(ins.first->second != NULL); | |
6654 | return ins.first->second; | |
6655 | } | |
6656 | ||
6657 | Location loc = fn->location(); | |
6658 | ||
6659 | Function_type* orig_fntype; | |
6660 | if (fn->is_function()) | |
6661 | orig_fntype = fn->func_value()->type(); | |
6662 | else if (fn->is_function_declaration()) | |
6663 | orig_fntype = fn->func_declaration_value()->type(); | |
6664 | else | |
6665 | orig_fntype = NULL; | |
6666 | ||
6667 | if (orig_fntype == NULL || !orig_fntype->is_method()) | |
e440a328 | 6668 | { |
0afbb937 | 6669 | ins.first->second = Named_object::make_erroneous_name(Gogo::thunk_name()); |
6670 | return ins.first->second; | |
e440a328 | 6671 | } |
0afbb937 | 6672 | |
6673 | Struct_field_list* sfl = new Struct_field_list(); | |
f8bdf81a | 6674 | // The type here is wrong--it should be the C function type. But it |
6675 | // doesn't really matter. | |
0afbb937 | 6676 | Type* vt = Type::make_pointer_type(Type::make_void_type()); |
6677 | sfl->push_back(Struct_field(Typed_identifier("fn.0", vt, loc))); | |
6678 | sfl->push_back(Struct_field(Typed_identifier("val.1", | |
6679 | orig_fntype->receiver()->type(), | |
6680 | loc))); | |
6681 | Type* closure_type = Type::make_struct_type(sfl, loc); | |
6682 | closure_type = Type::make_pointer_type(closure_type); | |
6683 | ||
f8bdf81a | 6684 | Function_type* new_fntype = orig_fntype->copy_with_names(); |
0afbb937 | 6685 | |
da244e59 | 6686 | std::string thunk_name = Gogo::thunk_name(); |
6687 | Named_object* new_no = gogo->start_function(thunk_name, new_fntype, | |
0afbb937 | 6688 | false, loc); |
6689 | ||
f8bdf81a | 6690 | Variable* cvar = new Variable(closure_type, NULL, false, false, false, loc); |
6691 | cvar->set_is_used(); | |
1ecc6157 | 6692 | cvar->set_is_closure(); |
da244e59 | 6693 | Named_object* cp = Named_object::make_variable("$closure" + thunk_name, |
6694 | NULL, cvar); | |
f8bdf81a | 6695 | new_no->func_value()->set_closure_var(cp); |
0afbb937 | 6696 | |
f8bdf81a | 6697 | gogo->start_block(loc); |
0afbb937 | 6698 | |
6699 | // Field 0 of the closure is the function code pointer, field 1 is | |
6700 | // the value on which to invoke the method. | |
6701 | Expression* arg = Expression::make_var_reference(cp, loc); | |
6702 | arg = Expression::make_unary(OPERATOR_MULT, arg, loc); | |
6703 | arg = Expression::make_field_reference(arg, 1, loc); | |
6704 | ||
6705 | Expression* bme = Expression::make_bound_method(arg, method, fn, loc); | |
6706 | ||
6707 | const Typed_identifier_list* orig_params = orig_fntype->parameters(); | |
6708 | Expression_list* args; | |
6709 | if (orig_params == NULL || orig_params->empty()) | |
6710 | args = NULL; | |
6711 | else | |
6712 | { | |
6713 | const Typed_identifier_list* new_params = new_fntype->parameters(); | |
6714 | args = new Expression_list(); | |
6715 | for (Typed_identifier_list::const_iterator p = new_params->begin(); | |
f8bdf81a | 6716 | p != new_params->end(); |
0afbb937 | 6717 | ++p) |
6718 | { | |
6719 | Named_object* p_no = gogo->lookup(p->name(), NULL); | |
6720 | go_assert(p_no != NULL | |
6721 | && p_no->is_variable() | |
6722 | && p_no->var_value()->is_parameter()); | |
6723 | args->push_back(Expression::make_var_reference(p_no, loc)); | |
6724 | } | |
6725 | } | |
6726 | ||
6727 | Call_expression* call = Expression::make_call(bme, args, | |
6728 | orig_fntype->is_varargs(), | |
6729 | loc); | |
6730 | call->set_varargs_are_lowered(); | |
6731 | ||
6732 | Statement* s = Statement::make_return_from_call(call, loc); | |
6733 | gogo->add_statement(s); | |
6734 | Block* b = gogo->finish_block(loc); | |
6735 | gogo->add_block(b, loc); | |
6736 | gogo->lower_block(new_no, b); | |
a32698ee | 6737 | gogo->flatten_block(new_no, b); |
0afbb937 | 6738 | gogo->finish_function(loc); |
6739 | ||
6740 | ins.first->second = new_no; | |
6741 | return new_no; | |
6742 | } | |
6743 | ||
6744 | // Return an expression to check *REF for nil while dereferencing | |
6745 | // according to FIELD_INDEXES. Update *REF to build up the field | |
6746 | // reference. This is a static function so that we don't have to | |
6747 | // worry about declaring Field_indexes in expressions.h. | |
6748 | ||
6749 | static Expression* | |
6750 | bme_check_nil(const Method::Field_indexes* field_indexes, Location loc, | |
6751 | Expression** ref) | |
6752 | { | |
6753 | if (field_indexes == NULL) | |
6754 | return Expression::make_boolean(false, loc); | |
6755 | Expression* cond = bme_check_nil(field_indexes->next, loc, ref); | |
6756 | Struct_type* stype = (*ref)->type()->deref()->struct_type(); | |
6757 | go_assert(stype != NULL | |
6758 | && field_indexes->field_index < stype->field_count()); | |
6759 | if ((*ref)->type()->struct_type() == NULL) | |
6760 | { | |
6761 | go_assert((*ref)->type()->points_to() != NULL); | |
6762 | Expression* n = Expression::make_binary(OPERATOR_EQEQ, *ref, | |
6763 | Expression::make_nil(loc), | |
6764 | loc); | |
6765 | cond = Expression::make_binary(OPERATOR_OROR, cond, n, loc); | |
6766 | *ref = Expression::make_unary(OPERATOR_MULT, *ref, loc); | |
6767 | go_assert((*ref)->type()->struct_type() == stype); | |
6768 | } | |
6769 | *ref = Expression::make_field_reference(*ref, field_indexes->field_index, | |
6770 | loc); | |
6771 | return cond; | |
e440a328 | 6772 | } |
6773 | ||
cd39797e | 6774 | // Flatten a method value into a struct with nil checks. We can't do |
6775 | // this in the lowering phase, because if the method value is called | |
6776 | // directly we don't need a thunk. That case will have been handled | |
6777 | // by Call_expression::do_lower, so if we get here then we do need a | |
6778 | // thunk. | |
e440a328 | 6779 | |
cd39797e | 6780 | Expression* |
6781 | Bound_method_expression::do_flatten(Gogo* gogo, Named_object*, | |
6782 | Statement_inserter* inserter) | |
e440a328 | 6783 | { |
cd39797e | 6784 | Location loc = this->location(); |
6785 | ||
6786 | Named_object* thunk = Bound_method_expression::create_thunk(gogo, | |
0afbb937 | 6787 | this->method_, |
6788 | this->function_); | |
6789 | if (thunk->is_erroneous()) | |
6790 | { | |
6791 | go_assert(saw_errors()); | |
cd39797e | 6792 | return Expression::make_error(loc); |
0afbb937 | 6793 | } |
6794 | ||
cd39797e | 6795 | // Force the expression into a variable. This is only necessary if |
6796 | // we are going to do nil checks below, but it's easy enough to | |
6797 | // always do it. | |
6798 | Expression* expr = this->expr_; | |
6799 | if (!expr->is_variable()) | |
6800 | { | |
6801 | Temporary_statement* etemp = Statement::make_temporary(NULL, expr, loc); | |
6802 | inserter->insert(etemp); | |
6803 | expr = Expression::make_temporary_reference(etemp, loc); | |
6804 | } | |
0afbb937 | 6805 | |
6806 | // If the method expects a value, and we have a pointer, we need to | |
6807 | // dereference the pointer. | |
6808 | ||
6809 | Named_object* fn = this->method_->named_object(); | |
cd39797e | 6810 | Function_type *fntype; |
0afbb937 | 6811 | if (fn->is_function()) |
6812 | fntype = fn->func_value()->type(); | |
6813 | else if (fn->is_function_declaration()) | |
6814 | fntype = fn->func_declaration_value()->type(); | |
6815 | else | |
6816 | go_unreachable(); | |
6817 | ||
cd39797e | 6818 | Expression* val = expr; |
0afbb937 | 6819 | if (fntype->receiver()->type()->points_to() == NULL |
6820 | && val->type()->points_to() != NULL) | |
6821 | val = Expression::make_unary(OPERATOR_MULT, val, loc); | |
6822 | ||
6823 | // Note that we are ignoring this->expr_type_ here. The thunk will | |
6824 | // expect a closure whose second field has type this->expr_type_ (if | |
6825 | // that is not NULL). We are going to pass it a closure whose | |
6826 | // second field has type this->expr_->type(). Since | |
6827 | // this->expr_type_ is only not-NULL for pointer types, we can get | |
6828 | // away with this. | |
6829 | ||
6830 | Struct_field_list* fields = new Struct_field_list(); | |
6831 | fields->push_back(Struct_field(Typed_identifier("fn.0", | |
6832 | thunk->func_value()->type(), | |
6833 | loc))); | |
6834 | fields->push_back(Struct_field(Typed_identifier("val.1", val->type(), loc))); | |
6835 | Struct_type* st = Type::make_struct_type(fields, loc); | |
6836 | ||
6837 | Expression_list* vals = new Expression_list(); | |
6838 | vals->push_back(Expression::make_func_code_reference(thunk, loc)); | |
6839 | vals->push_back(val); | |
6840 | ||
6841 | Expression* ret = Expression::make_struct_composite_literal(st, vals, loc); | |
0afbb937 | 6842 | |
cd39797e | 6843 | if (!gogo->compiling_runtime() || gogo->package_name() != "runtime") |
6844 | ret = Expression::make_heap_expression(ret, loc); | |
6845 | else | |
6846 | { | |
6847 | // When compiling the runtime, method closures do not escape. | |
6848 | // When escape analysis becomes the default, and applies to | |
6849 | // method closures, this should be changed to make it an error | |
6850 | // if a method closure escapes. | |
6851 | Temporary_statement* ctemp = Statement::make_temporary(st, ret, loc); | |
6852 | inserter->insert(ctemp); | |
6853 | ret = Expression::make_temporary_reference(ctemp, loc); | |
6854 | ret = Expression::make_unary(OPERATOR_AND, ret, loc); | |
6855 | ret->unary_expression()->set_does_not_escape(); | |
6856 | } | |
6857 | ||
6858 | // If necessary, check whether the expression or any embedded | |
6859 | // pointers are nil. | |
0afbb937 | 6860 | |
df7ef1fd | 6861 | Expression* nil_check = NULL; |
0afbb937 | 6862 | if (this->method_->field_indexes() != NULL) |
6863 | { | |
0afbb937 | 6864 | Expression* ref = expr; |
6865 | nil_check = bme_check_nil(this->method_->field_indexes(), loc, &ref); | |
6866 | expr = ref; | |
6867 | } | |
6868 | ||
6869 | if (this->method_->is_value_method() && expr->type()->points_to() != NULL) | |
6870 | { | |
6871 | Expression* n = Expression::make_binary(OPERATOR_EQEQ, expr, | |
6872 | Expression::make_nil(loc), | |
6873 | loc); | |
6874 | if (nil_check == NULL) | |
6875 | nil_check = n; | |
6876 | else | |
6877 | nil_check = Expression::make_binary(OPERATOR_OROR, nil_check, n, loc); | |
6878 | } | |
6879 | ||
6880 | if (nil_check != NULL) | |
6881 | { | |
cd39797e | 6882 | Expression* crash = gogo->runtime_error(RUNTIME_ERROR_NIL_DEREFERENCE, |
6883 | loc); | |
6884 | // Fix the type of the conditional expression by pretending to | |
6885 | // evaluate to RET either way through the conditional. | |
6886 | crash = Expression::make_compound(crash, ret, loc); | |
6887 | ret = Expression::make_conditional(nil_check, crash, ret, loc); | |
6888 | } | |
6889 | ||
6890 | // RET is a pointer to a struct, but we want a function type. | |
6891 | ret = Expression::make_unsafe_cast(this->type(), ret, loc); | |
6892 | ||
6893 | return ret; | |
e440a328 | 6894 | } |
6895 | ||
d751bb78 | 6896 | // Dump ast representation of a bound method expression. |
6897 | ||
6898 | void | |
6899 | Bound_method_expression::do_dump_expression(Ast_dump_context* ast_dump_context) | |
6900 | const | |
6901 | { | |
6902 | if (this->expr_type_ != NULL) | |
6903 | ast_dump_context->ostream() << "("; | |
6904 | ast_dump_context->dump_expression(this->expr_); | |
6905 | if (this->expr_type_ != NULL) | |
6906 | { | |
6907 | ast_dump_context->ostream() << ":"; | |
6908 | ast_dump_context->dump_type(this->expr_type_); | |
6909 | ast_dump_context->ostream() << ")"; | |
6910 | } | |
6911 | ||
0afbb937 | 6912 | ast_dump_context->ostream() << "." << this->function_->name(); |
d751bb78 | 6913 | } |
6914 | ||
e440a328 | 6915 | // Make a method expression. |
6916 | ||
6917 | Bound_method_expression* | |
0afbb937 | 6918 | Expression::make_bound_method(Expression* expr, const Method* method, |
6919 | Named_object* function, Location location) | |
e440a328 | 6920 | { |
0afbb937 | 6921 | return new Bound_method_expression(expr, method, function, location); |
e440a328 | 6922 | } |
6923 | ||
6924 | // Class Builtin_call_expression. This is used for a call to a | |
6925 | // builtin function. | |
6926 | ||
6927 | class Builtin_call_expression : public Call_expression | |
6928 | { | |
6929 | public: | |
6930 | Builtin_call_expression(Gogo* gogo, Expression* fn, Expression_list* args, | |
b13c66cd | 6931 | bool is_varargs, Location location); |
e440a328 | 6932 | |
6933 | protected: | |
6934 | // This overrides Call_expression::do_lower. | |
6935 | Expression* | |
ceeb4318 | 6936 | do_lower(Gogo*, Named_object*, Statement_inserter*, int); |
e440a328 | 6937 | |
35a54f17 | 6938 | Expression* |
6939 | do_flatten(Gogo*, Named_object*, Statement_inserter*); | |
6940 | ||
e440a328 | 6941 | bool |
6942 | do_is_constant() const; | |
6943 | ||
6944 | bool | |
0c77715b | 6945 | do_numeric_constant_value(Numeric_constant*) const; |
e440a328 | 6946 | |
4f2138d7 | 6947 | bool |
a7549a6a | 6948 | do_discarding_value(); |
6949 | ||
e440a328 | 6950 | Type* |
6951 | do_type(); | |
6952 | ||
6953 | void | |
6954 | do_determine_type(const Type_context*); | |
6955 | ||
6956 | void | |
6957 | do_check_types(Gogo*); | |
6958 | ||
6959 | Expression* | |
72666aed | 6960 | do_copy(); |
e440a328 | 6961 | |
ea664253 | 6962 | Bexpression* |
6963 | do_get_backend(Translate_context*); | |
e440a328 | 6964 | |
6965 | void | |
6966 | do_export(Export*) const; | |
6967 | ||
6968 | virtual bool | |
6969 | do_is_recover_call() const; | |
6970 | ||
6971 | virtual void | |
6972 | do_set_recover_arg(Expression*); | |
6973 | ||
6974 | private: | |
6975 | // The builtin functions. | |
6976 | enum Builtin_function_code | |
6977 | { | |
6978 | BUILTIN_INVALID, | |
6979 | ||
6980 | // Predeclared builtin functions. | |
6981 | BUILTIN_APPEND, | |
6982 | BUILTIN_CAP, | |
6983 | BUILTIN_CLOSE, | |
48080209 | 6984 | BUILTIN_COMPLEX, |
e440a328 | 6985 | BUILTIN_COPY, |
1cce762f | 6986 | BUILTIN_DELETE, |
e440a328 | 6987 | BUILTIN_IMAG, |
6988 | BUILTIN_LEN, | |
6989 | BUILTIN_MAKE, | |
6990 | BUILTIN_NEW, | |
6991 | BUILTIN_PANIC, | |
6992 | BUILTIN_PRINT, | |
6993 | BUILTIN_PRINTLN, | |
6994 | BUILTIN_REAL, | |
6995 | BUILTIN_RECOVER, | |
6996 | ||
6997 | // Builtin functions from the unsafe package. | |
6998 | BUILTIN_ALIGNOF, | |
6999 | BUILTIN_OFFSETOF, | |
7000 | BUILTIN_SIZEOF | |
7001 | }; | |
7002 | ||
7003 | Expression* | |
7004 | one_arg() const; | |
7005 | ||
7006 | bool | |
7007 | check_one_arg(); | |
7008 | ||
7009 | static Type* | |
7010 | real_imag_type(Type*); | |
7011 | ||
7012 | static Type* | |
48080209 | 7013 | complex_type(Type*); |
e440a328 | 7014 | |
a9182619 | 7015 | Expression* |
321e5ad2 | 7016 | lower_make(Statement_inserter*); |
7017 | ||
7018 | Expression* flatten_append(Gogo*, Named_object*, Statement_inserter*); | |
a9182619 | 7019 | |
7020 | bool | |
1ad00fd4 | 7021 | check_int_value(Expression*, bool is_length); |
a9182619 | 7022 | |
e440a328 | 7023 | // A pointer back to the general IR structure. This avoids a global |
7024 | // variable, or passing it around everywhere. | |
7025 | Gogo* gogo_; | |
7026 | // The builtin function being called. | |
7027 | Builtin_function_code code_; | |
0f914071 | 7028 | // Used to stop endless loops when the length of an array uses len |
7029 | // or cap of the array itself. | |
7030 | mutable bool seen_; | |
6334270b | 7031 | // Whether the argument is set for calls to BUILTIN_RECOVER. |
7032 | bool recover_arg_is_set_; | |
e440a328 | 7033 | }; |
7034 | ||
7035 | Builtin_call_expression::Builtin_call_expression(Gogo* gogo, | |
7036 | Expression* fn, | |
7037 | Expression_list* args, | |
7038 | bool is_varargs, | |
b13c66cd | 7039 | Location location) |
e440a328 | 7040 | : Call_expression(fn, args, is_varargs, location), |
6334270b | 7041 | gogo_(gogo), code_(BUILTIN_INVALID), seen_(false), |
7042 | recover_arg_is_set_(false) | |
e440a328 | 7043 | { |
7044 | Func_expression* fnexp = this->fn()->func_expression(); | |
79651b1f | 7045 | if (fnexp == NULL) |
7046 | { | |
7047 | this->code_ = BUILTIN_INVALID; | |
7048 | return; | |
7049 | } | |
e440a328 | 7050 | const std::string& name(fnexp->named_object()->name()); |
7051 | if (name == "append") | |
7052 | this->code_ = BUILTIN_APPEND; | |
7053 | else if (name == "cap") | |
7054 | this->code_ = BUILTIN_CAP; | |
7055 | else if (name == "close") | |
7056 | this->code_ = BUILTIN_CLOSE; | |
48080209 | 7057 | else if (name == "complex") |
7058 | this->code_ = BUILTIN_COMPLEX; | |
e440a328 | 7059 | else if (name == "copy") |
7060 | this->code_ = BUILTIN_COPY; | |
1cce762f | 7061 | else if (name == "delete") |
7062 | this->code_ = BUILTIN_DELETE; | |
e440a328 | 7063 | else if (name == "imag") |
7064 | this->code_ = BUILTIN_IMAG; | |
7065 | else if (name == "len") | |
7066 | this->code_ = BUILTIN_LEN; | |
7067 | else if (name == "make") | |
7068 | this->code_ = BUILTIN_MAKE; | |
7069 | else if (name == "new") | |
7070 | this->code_ = BUILTIN_NEW; | |
7071 | else if (name == "panic") | |
7072 | this->code_ = BUILTIN_PANIC; | |
7073 | else if (name == "print") | |
7074 | this->code_ = BUILTIN_PRINT; | |
7075 | else if (name == "println") | |
7076 | this->code_ = BUILTIN_PRINTLN; | |
7077 | else if (name == "real") | |
7078 | this->code_ = BUILTIN_REAL; | |
7079 | else if (name == "recover") | |
7080 | this->code_ = BUILTIN_RECOVER; | |
7081 | else if (name == "Alignof") | |
7082 | this->code_ = BUILTIN_ALIGNOF; | |
7083 | else if (name == "Offsetof") | |
7084 | this->code_ = BUILTIN_OFFSETOF; | |
7085 | else if (name == "Sizeof") | |
7086 | this->code_ = BUILTIN_SIZEOF; | |
7087 | else | |
c3e6f413 | 7088 | go_unreachable(); |
e440a328 | 7089 | } |
7090 | ||
7091 | // Return whether this is a call to recover. This is a virtual | |
7092 | // function called from the parent class. | |
7093 | ||
7094 | bool | |
7095 | Builtin_call_expression::do_is_recover_call() const | |
7096 | { | |
7097 | if (this->classification() == EXPRESSION_ERROR) | |
7098 | return false; | |
7099 | return this->code_ == BUILTIN_RECOVER; | |
7100 | } | |
7101 | ||
7102 | // Set the argument for a call to recover. | |
7103 | ||
7104 | void | |
7105 | Builtin_call_expression::do_set_recover_arg(Expression* arg) | |
7106 | { | |
7107 | const Expression_list* args = this->args(); | |
c484d925 | 7108 | go_assert(args == NULL || args->empty()); |
e440a328 | 7109 | Expression_list* new_args = new Expression_list(); |
7110 | new_args->push_back(arg); | |
7111 | this->set_args(new_args); | |
6334270b | 7112 | this->recover_arg_is_set_ = true; |
e440a328 | 7113 | } |
7114 | ||
e440a328 | 7115 | // Lower a builtin call expression. This turns new and make into |
7116 | // specific expressions. We also convert to a constant if we can. | |
7117 | ||
7118 | Expression* | |
321e5ad2 | 7119 | Builtin_call_expression::do_lower(Gogo*, Named_object* function, |
ceeb4318 | 7120 | Statement_inserter* inserter, int) |
e440a328 | 7121 | { |
79651b1f | 7122 | if (this->is_error_expression()) |
a9182619 | 7123 | return this; |
7124 | ||
b13c66cd | 7125 | Location loc = this->location(); |
1cce762f | 7126 | |
a8725655 | 7127 | if (this->is_varargs() && this->code_ != BUILTIN_APPEND) |
7128 | { | |
7129 | this->report_error(_("invalid use of %<...%> with builtin function")); | |
1cce762f | 7130 | return Expression::make_error(loc); |
a8725655 | 7131 | } |
7132 | ||
393ba00b | 7133 | if (this->code_ == BUILTIN_OFFSETOF) |
7134 | { | |
7135 | Expression* arg = this->one_arg(); | |
12e69faa | 7136 | |
7137 | if (arg->bound_method_expression() != NULL | |
7138 | || arg->interface_field_reference_expression() != NULL) | |
7139 | { | |
7140 | this->report_error(_("invalid use of method value as argument " | |
7141 | "of Offsetof")); | |
7142 | return this; | |
7143 | } | |
7144 | ||
393ba00b | 7145 | Field_reference_expression* farg = arg->field_reference_expression(); |
7146 | while (farg != NULL) | |
7147 | { | |
7148 | if (!farg->implicit()) | |
7149 | break; | |
7150 | // When the selector refers to an embedded field, | |
7151 | // it must not be reached through pointer indirections. | |
7152 | if (farg->expr()->deref() != farg->expr()) | |
7153 | { | |
12e69faa | 7154 | this->report_error(_("argument of Offsetof implies " |
7155 | "indirection of an embedded field")); | |
393ba00b | 7156 | return this; |
7157 | } | |
7158 | // Go up until we reach the original base. | |
7159 | farg = farg->expr()->field_reference_expression(); | |
7160 | } | |
7161 | } | |
7162 | ||
1cce762f | 7163 | if (this->is_constant()) |
e440a328 | 7164 | { |
0c77715b | 7165 | Numeric_constant nc; |
7166 | if (this->numeric_constant_value(&nc)) | |
7167 | return nc.expression(loc); | |
e440a328 | 7168 | } |
1cce762f | 7169 | |
7170 | switch (this->code_) | |
e440a328 | 7171 | { |
1cce762f | 7172 | default: |
7173 | break; | |
7174 | ||
7175 | case BUILTIN_NEW: | |
7176 | { | |
7177 | const Expression_list* args = this->args(); | |
7178 | if (args == NULL || args->size() < 1) | |
7179 | this->report_error(_("not enough arguments")); | |
7180 | else if (args->size() > 1) | |
7181 | this->report_error(_("too many arguments")); | |
7182 | else | |
7183 | { | |
7184 | Expression* arg = args->front(); | |
7185 | if (!arg->is_type_expression()) | |
7186 | { | |
631d5788 | 7187 | go_error_at(arg->location(), "expected type"); |
1cce762f | 7188 | this->set_is_error(); |
7189 | } | |
7190 | else | |
7191 | return Expression::make_allocation(arg->type(), loc); | |
7192 | } | |
7193 | } | |
7194 | break; | |
7195 | ||
7196 | case BUILTIN_MAKE: | |
321e5ad2 | 7197 | return this->lower_make(inserter); |
1cce762f | 7198 | |
7199 | case BUILTIN_RECOVER: | |
e440a328 | 7200 | if (function != NULL) |
7201 | function->func_value()->set_calls_recover(); | |
7202 | else | |
7203 | { | |
7204 | // Calling recover outside of a function always returns the | |
7205 | // nil empty interface. | |
823c7e3d | 7206 | Type* eface = Type::make_empty_interface_type(loc); |
1cce762f | 7207 | return Expression::make_cast(eface, Expression::make_nil(loc), loc); |
e440a328 | 7208 | } |
1cce762f | 7209 | break; |
7210 | ||
1cce762f | 7211 | case BUILTIN_DELETE: |
7212 | { | |
7213 | // Lower to a runtime function call. | |
7214 | const Expression_list* args = this->args(); | |
7215 | if (args == NULL || args->size() < 2) | |
7216 | this->report_error(_("not enough arguments")); | |
7217 | else if (args->size() > 2) | |
7218 | this->report_error(_("too many arguments")); | |
7219 | else if (args->front()->type()->map_type() == NULL) | |
7220 | this->report_error(_("argument 1 must be a map")); | |
7221 | else | |
7222 | { | |
7223 | // Since this function returns no value it must appear in | |
7224 | // a statement by itself, so we don't have to worry about | |
7225 | // order of evaluation of values around it. Evaluate the | |
7226 | // map first to get order of evaluation right. | |
7227 | Map_type* mt = args->front()->type()->map_type(); | |
7228 | Temporary_statement* map_temp = | |
7229 | Statement::make_temporary(mt, args->front(), loc); | |
7230 | inserter->insert(map_temp); | |
7231 | ||
7232 | Temporary_statement* key_temp = | |
7233 | Statement::make_temporary(mt->key_type(), args->back(), loc); | |
7234 | inserter->insert(key_temp); | |
7235 | ||
0d5530d9 | 7236 | Expression* e1 = Expression::make_type_descriptor(mt, loc); |
7237 | Expression* e2 = Expression::make_temporary_reference(map_temp, | |
1cce762f | 7238 | loc); |
0d5530d9 | 7239 | Expression* e3 = Expression::make_temporary_reference(key_temp, |
1cce762f | 7240 | loc); |
0d5530d9 | 7241 | e3 = Expression::make_unary(OPERATOR_AND, e3, loc); |
1cce762f | 7242 | return Runtime::make_call(Runtime::MAPDELETE, this->location(), |
0d5530d9 | 7243 | 3, e1, e2, e3); |
1cce762f | 7244 | } |
7245 | } | |
7246 | break; | |
88b03a70 | 7247 | |
7248 | case BUILTIN_PRINT: | |
7249 | case BUILTIN_PRINTLN: | |
7250 | // Force all the arguments into temporary variables, so that we | |
7251 | // don't try to evaluate something while holding the print lock. | |
7252 | if (this->args() == NULL) | |
7253 | break; | |
7254 | for (Expression_list::iterator pa = this->args()->begin(); | |
7255 | pa != this->args()->end(); | |
7256 | ++pa) | |
7257 | { | |
493ce3ee | 7258 | if (!(*pa)->is_variable() && !(*pa)->is_constant()) |
88b03a70 | 7259 | { |
7260 | Temporary_statement* temp = | |
7261 | Statement::make_temporary(NULL, *pa, loc); | |
7262 | inserter->insert(temp); | |
7263 | *pa = Expression::make_temporary_reference(temp, loc); | |
7264 | } | |
7265 | } | |
7266 | break; | |
e440a328 | 7267 | } |
7268 | ||
7269 | return this; | |
7270 | } | |
7271 | ||
35a54f17 | 7272 | // Flatten a builtin call expression. This turns the arguments of copy and |
7273 | // append into temporary expressions. | |
7274 | ||
7275 | Expression* | |
321e5ad2 | 7276 | Builtin_call_expression::do_flatten(Gogo* gogo, Named_object* function, |
35a54f17 | 7277 | Statement_inserter* inserter) |
7278 | { | |
16cb7fec | 7279 | Location loc = this->location(); |
7280 | ||
7281 | switch (this->code_) | |
35a54f17 | 7282 | { |
16cb7fec | 7283 | default: |
7284 | break; | |
7285 | ||
7286 | case BUILTIN_APPEND: | |
321e5ad2 | 7287 | return this->flatten_append(gogo, function, inserter); |
7288 | ||
16cb7fec | 7289 | case BUILTIN_COPY: |
7290 | { | |
7291 | Type* at = this->args()->front()->type(); | |
7292 | for (Expression_list::iterator pa = this->args()->begin(); | |
7293 | pa != this->args()->end(); | |
7294 | ++pa) | |
7295 | { | |
7296 | if ((*pa)->is_nil_expression()) | |
7297 | { | |
7298 | Expression* nil = Expression::make_nil(loc); | |
7299 | Expression* zero = Expression::make_integer_ul(0, NULL, loc); | |
7300 | *pa = Expression::make_slice_value(at, nil, zero, zero, loc); | |
7301 | } | |
7302 | if (!(*pa)->is_variable()) | |
7303 | { | |
7304 | Temporary_statement* temp = | |
7305 | Statement::make_temporary(NULL, *pa, loc); | |
7306 | inserter->insert(temp); | |
7307 | *pa = Expression::make_temporary_reference(temp, loc); | |
7308 | } | |
7309 | } | |
7310 | } | |
7311 | break; | |
7312 | ||
7313 | case BUILTIN_PANIC: | |
35a54f17 | 7314 | for (Expression_list::iterator pa = this->args()->begin(); |
16cb7fec | 7315 | pa != this->args()->end(); |
7316 | ++pa) | |
7317 | { | |
7318 | if (!(*pa)->is_variable() && (*pa)->type()->interface_type() != NULL) | |
55e8ba6a | 7319 | { |
16cb7fec | 7320 | Temporary_statement* temp = |
7321 | Statement::make_temporary(NULL, *pa, loc); | |
7322 | inserter->insert(temp); | |
7323 | *pa = Expression::make_temporary_reference(temp, loc); | |
55e8ba6a | 7324 | } |
16cb7fec | 7325 | } |
7739537f | 7326 | break; |
0d5530d9 | 7327 | |
7328 | case BUILTIN_LEN: | |
132ed071 | 7329 | case BUILTIN_CAP: |
321e5ad2 | 7330 | { |
7331 | Expression_list::iterator pa = this->args()->begin(); | |
7332 | if (!(*pa)->is_variable() | |
7333 | && ((*pa)->type()->map_type() != NULL | |
7334 | || (*pa)->type()->channel_type() != NULL)) | |
7335 | { | |
7336 | Temporary_statement* temp = | |
7337 | Statement::make_temporary(NULL, *pa, loc); | |
7338 | inserter->insert(temp); | |
7339 | *pa = Expression::make_temporary_reference(temp, loc); | |
7340 | } | |
7341 | } | |
7342 | break; | |
35a54f17 | 7343 | } |
16cb7fec | 7344 | |
35a54f17 | 7345 | return this; |
7346 | } | |
7347 | ||
a9182619 | 7348 | // Lower a make expression. |
7349 | ||
7350 | Expression* | |
321e5ad2 | 7351 | Builtin_call_expression::lower_make(Statement_inserter* inserter) |
a9182619 | 7352 | { |
b13c66cd | 7353 | Location loc = this->location(); |
a9182619 | 7354 | |
7355 | const Expression_list* args = this->args(); | |
7356 | if (args == NULL || args->size() < 1) | |
7357 | { | |
7358 | this->report_error(_("not enough arguments")); | |
7359 | return Expression::make_error(this->location()); | |
7360 | } | |
7361 | ||
7362 | Expression_list::const_iterator parg = args->begin(); | |
7363 | ||
7364 | Expression* first_arg = *parg; | |
7365 | if (!first_arg->is_type_expression()) | |
7366 | { | |
631d5788 | 7367 | go_error_at(first_arg->location(), "expected type"); |
a9182619 | 7368 | this->set_is_error(); |
7369 | return Expression::make_error(this->location()); | |
7370 | } | |
7371 | Type* type = first_arg->type(); | |
7372 | ||
7373 | bool is_slice = false; | |
7374 | bool is_map = false; | |
7375 | bool is_chan = false; | |
411eb89e | 7376 | if (type->is_slice_type()) |
a9182619 | 7377 | is_slice = true; |
7378 | else if (type->map_type() != NULL) | |
7379 | is_map = true; | |
7380 | else if (type->channel_type() != NULL) | |
7381 | is_chan = true; | |
7382 | else | |
7383 | { | |
7384 | this->report_error(_("invalid type for make function")); | |
7385 | return Expression::make_error(this->location()); | |
7386 | } | |
7387 | ||
f6bc81e6 | 7388 | Type_context int_context(Type::lookup_integer_type("int"), false); |
7389 | ||
a9182619 | 7390 | ++parg; |
7391 | Expression* len_arg; | |
7392 | if (parg == args->end()) | |
7393 | { | |
7394 | if (is_slice) | |
7395 | { | |
7396 | this->report_error(_("length required when allocating a slice")); | |
7397 | return Expression::make_error(this->location()); | |
7398 | } | |
e67508fa | 7399 | len_arg = Expression::make_integer_ul(0, NULL, loc); |
a9182619 | 7400 | } |
7401 | else | |
7402 | { | |
7403 | len_arg = *parg; | |
f6bc81e6 | 7404 | len_arg->determine_type(&int_context); |
1ad00fd4 | 7405 | if (!this->check_int_value(len_arg, true)) |
7406 | return Expression::make_error(this->location()); | |
a9182619 | 7407 | ++parg; |
7408 | } | |
7409 | ||
7410 | Expression* cap_arg = NULL; | |
7411 | if (is_slice && parg != args->end()) | |
7412 | { | |
7413 | cap_arg = *parg; | |
f6bc81e6 | 7414 | cap_arg->determine_type(&int_context); |
1ad00fd4 | 7415 | if (!this->check_int_value(cap_arg, false)) |
7416 | return Expression::make_error(this->location()); | |
7417 | ||
7418 | Numeric_constant nclen; | |
7419 | Numeric_constant nccap; | |
7420 | unsigned long vlen; | |
7421 | unsigned long vcap; | |
7422 | if (len_arg->numeric_constant_value(&nclen) | |
7423 | && cap_arg->numeric_constant_value(&nccap) | |
7424 | && nclen.to_unsigned_long(&vlen) == Numeric_constant::NC_UL_VALID | |
7425 | && nccap.to_unsigned_long(&vcap) == Numeric_constant::NC_UL_VALID | |
7426 | && vlen > vcap) | |
a9182619 | 7427 | { |
1ad00fd4 | 7428 | this->report_error(_("len larger than cap")); |
a9182619 | 7429 | return Expression::make_error(this->location()); |
7430 | } | |
1ad00fd4 | 7431 | |
a9182619 | 7432 | ++parg; |
7433 | } | |
7434 | ||
7435 | if (parg != args->end()) | |
7436 | { | |
7437 | this->report_error(_("too many arguments to make")); | |
7438 | return Expression::make_error(this->location()); | |
7439 | } | |
7440 | ||
b13c66cd | 7441 | Location type_loc = first_arg->location(); |
a9182619 | 7442 | |
7443 | Expression* call; | |
7444 | if (is_slice) | |
7445 | { | |
321e5ad2 | 7446 | Type* et = type->array_type()->element_type(); |
7447 | Expression* type_arg = Expression::make_type_descriptor(et, type_loc); | |
a9182619 | 7448 | if (cap_arg == NULL) |
321e5ad2 | 7449 | { |
7450 | Temporary_statement* temp = Statement::make_temporary(NULL, | |
7451 | len_arg, | |
7452 | loc); | |
7453 | inserter->insert(temp); | |
7454 | len_arg = Expression::make_temporary_reference(temp, loc); | |
7455 | cap_arg = Expression::make_temporary_reference(temp, loc); | |
7456 | } | |
7457 | call = Runtime::make_call(Runtime::MAKESLICE, loc, 3, type_arg, | |
7458 | len_arg, cap_arg); | |
a9182619 | 7459 | } |
7460 | else if (is_map) | |
321e5ad2 | 7461 | { |
7462 | Expression* type_arg = Expression::make_type_descriptor(type, type_loc); | |
7463 | call = Runtime::make_call(Runtime::MAKEMAP, loc, 4, type_arg, len_arg, | |
7464 | Expression::make_nil(loc), | |
7465 | Expression::make_nil(loc)); | |
7466 | } | |
a9182619 | 7467 | else if (is_chan) |
321e5ad2 | 7468 | { |
7469 | Expression* type_arg = Expression::make_type_descriptor(type, type_loc); | |
7470 | call = Runtime::make_call(Runtime::MAKECHAN, loc, 2, type_arg, len_arg); | |
7471 | } | |
a9182619 | 7472 | else |
7473 | go_unreachable(); | |
7474 | ||
7475 | return Expression::make_unsafe_cast(type, call, loc); | |
7476 | } | |
7477 | ||
321e5ad2 | 7478 | // Flatten a call to the predeclared append function. We do this in |
7479 | // the flatten phase, not the lowering phase, so that we run after | |
7480 | // type checking and after order_evaluations. | |
7481 | ||
7482 | Expression* | |
7483 | Builtin_call_expression::flatten_append(Gogo* gogo, Named_object* function, | |
7484 | Statement_inserter* inserter) | |
7485 | { | |
7486 | if (this->is_error_expression()) | |
7487 | return this; | |
7488 | ||
7489 | Location loc = this->location(); | |
7490 | ||
7491 | const Expression_list* args = this->args(); | |
7492 | go_assert(args != NULL && !args->empty()); | |
7493 | ||
7494 | Type* slice_type = args->front()->type(); | |
7495 | go_assert(slice_type->is_slice_type()); | |
7496 | Type* element_type = slice_type->array_type()->element_type(); | |
7497 | ||
7498 | if (args->size() == 1) | |
7499 | { | |
7500 | // append(s) evaluates to s. | |
7501 | return args->front(); | |
7502 | } | |
7503 | ||
7504 | Type* int_type = Type::lookup_integer_type("int"); | |
7505 | Type* uint_type = Type::lookup_integer_type("uint"); | |
7506 | ||
7507 | // Implementing | |
7508 | // append(s1, s2...) | |
7509 | // or | |
7510 | // append(s1, a1, a2, a3, ...) | |
7511 | ||
7512 | // s1tmp := s1 | |
7513 | Temporary_statement* s1tmp = Statement::make_temporary(NULL, args->front(), | |
7514 | loc); | |
7515 | inserter->insert(s1tmp); | |
7516 | ||
7517 | // l1tmp := len(s1tmp) | |
7518 | Named_object* lenfn = gogo->lookup_global("len"); | |
7519 | Expression* lenref = Expression::make_func_reference(lenfn, NULL, loc); | |
7520 | Expression_list* call_args = new Expression_list(); | |
7521 | call_args->push_back(Expression::make_temporary_reference(s1tmp, loc)); | |
7522 | Expression* len = Expression::make_call(lenref, call_args, false, loc); | |
7523 | gogo->lower_expression(function, inserter, &len); | |
7524 | gogo->flatten_expression(function, inserter, &len); | |
7525 | Temporary_statement* l1tmp = Statement::make_temporary(int_type, len, loc); | |
7526 | inserter->insert(l1tmp); | |
7527 | ||
7528 | Temporary_statement* s2tmp = NULL; | |
7529 | Temporary_statement* l2tmp = NULL; | |
7530 | Expression_list* add = NULL; | |
7531 | Expression* len2; | |
7532 | if (this->is_varargs()) | |
7533 | { | |
7534 | go_assert(args->size() == 2); | |
7535 | ||
7536 | // s2tmp := s2 | |
7537 | s2tmp = Statement::make_temporary(NULL, args->back(), loc); | |
7538 | inserter->insert(s2tmp); | |
7539 | ||
7540 | // l2tmp := len(s2tmp) | |
7541 | lenref = Expression::make_func_reference(lenfn, NULL, loc); | |
7542 | call_args = new Expression_list(); | |
7543 | call_args->push_back(Expression::make_temporary_reference(s2tmp, loc)); | |
7544 | len = Expression::make_call(lenref, call_args, false, loc); | |
7545 | gogo->lower_expression(function, inserter, &len); | |
7546 | gogo->flatten_expression(function, inserter, &len); | |
7547 | l2tmp = Statement::make_temporary(int_type, len, loc); | |
7548 | inserter->insert(l2tmp); | |
7549 | ||
7550 | // len2 = l2tmp | |
7551 | len2 = Expression::make_temporary_reference(l2tmp, loc); | |
7552 | } | |
7553 | else | |
7554 | { | |
7555 | // We have to ensure that all the arguments are in variables | |
7556 | // now, because otherwise if one of them is an index expression | |
7557 | // into the current slice we could overwrite it before we fetch | |
7558 | // it. | |
7559 | add = new Expression_list(); | |
7560 | Expression_list::const_iterator pa = args->begin(); | |
7561 | for (++pa; pa != args->end(); ++pa) | |
7562 | { | |
7563 | if ((*pa)->is_variable()) | |
7564 | add->push_back(*pa); | |
7565 | else | |
7566 | { | |
7567 | Temporary_statement* tmp = Statement::make_temporary(NULL, *pa, | |
7568 | loc); | |
7569 | inserter->insert(tmp); | |
7570 | add->push_back(Expression::make_temporary_reference(tmp, loc)); | |
7571 | } | |
7572 | } | |
7573 | ||
7574 | // len2 = len(add) | |
7575 | len2 = Expression::make_integer_ul(add->size(), int_type, loc); | |
7576 | } | |
7577 | ||
7578 | // ntmp := l1tmp + len2 | |
7579 | Expression* ref = Expression::make_temporary_reference(l1tmp, loc); | |
7580 | Expression* sum = Expression::make_binary(OPERATOR_PLUS, ref, len2, loc); | |
7581 | gogo->lower_expression(function, inserter, &sum); | |
7582 | gogo->flatten_expression(function, inserter, &sum); | |
7583 | Temporary_statement* ntmp = Statement::make_temporary(int_type, sum, loc); | |
7584 | inserter->insert(ntmp); | |
7585 | ||
7586 | // s1tmp = uint(ntmp) > uint(cap(s1tmp)) ? | |
7587 | // growslice(type, s1tmp, ntmp) : | |
7588 | // s1tmp[:ntmp] | |
7589 | // Using uint here means that if the computation of ntmp overflowed, | |
7590 | // we will call growslice which will panic. | |
7591 | ||
7592 | Expression* left = Expression::make_temporary_reference(ntmp, loc); | |
7593 | left = Expression::make_cast(uint_type, left, loc); | |
7594 | ||
7595 | Named_object* capfn = gogo->lookup_global("cap"); | |
7596 | Expression* capref = Expression::make_func_reference(capfn, NULL, loc); | |
7597 | call_args = new Expression_list(); | |
7598 | call_args->push_back(Expression::make_temporary_reference(s1tmp, loc)); | |
7599 | Expression* right = Expression::make_call(capref, call_args, false, loc); | |
7600 | right = Expression::make_cast(uint_type, right, loc); | |
7601 | ||
7602 | Expression* cond = Expression::make_binary(OPERATOR_GT, left, right, loc); | |
7603 | ||
7604 | Expression* a1 = Expression::make_type_descriptor(element_type, loc); | |
7605 | Expression* a2 = Expression::make_temporary_reference(s1tmp, loc); | |
7606 | Expression* a3 = Expression::make_temporary_reference(ntmp, loc); | |
7607 | Expression* call = Runtime::make_call(Runtime::GROWSLICE, loc, 3, | |
7608 | a1, a2, a3); | |
7609 | call = Expression::make_unsafe_cast(slice_type, call, loc); | |
7610 | ||
7611 | ref = Expression::make_temporary_reference(s1tmp, loc); | |
7612 | Expression* zero = Expression::make_integer_ul(0, int_type, loc); | |
7613 | Expression* ref2 = Expression::make_temporary_reference(ntmp, loc); | |
7614 | // FIXME: Mark this index as not requiring bounds checks. | |
7615 | ref = Expression::make_index(ref, zero, ref2, NULL, loc); | |
7616 | ||
7617 | Expression* rhs = Expression::make_conditional(cond, call, ref, loc); | |
7618 | ||
7619 | gogo->lower_expression(function, inserter, &rhs); | |
7620 | gogo->flatten_expression(function, inserter, &rhs); | |
7621 | ||
7622 | Expression* lhs = Expression::make_temporary_reference(s1tmp, loc); | |
7623 | Statement* assign = Statement::make_assignment(lhs, rhs, loc); | |
7624 | inserter->insert(assign); | |
7625 | ||
7626 | if (this->is_varargs()) | |
7627 | { | |
7628 | // copy(s1tmp[l1tmp:], s2tmp) | |
7629 | a1 = Expression::make_temporary_reference(s1tmp, loc); | |
7630 | ref = Expression::make_temporary_reference(l1tmp, loc); | |
7631 | Expression* nil = Expression::make_nil(loc); | |
7632 | // FIXME: Mark this index as not requiring bounds checks. | |
7633 | a1 = Expression::make_index(a1, ref, nil, NULL, loc); | |
7634 | ||
7635 | a2 = Expression::make_temporary_reference(s2tmp, loc); | |
7636 | ||
7637 | Named_object* copyfn = gogo->lookup_global("copy"); | |
7638 | Expression* copyref = Expression::make_func_reference(copyfn, NULL, loc); | |
7639 | call_args = new Expression_list(); | |
7640 | call_args->push_back(a1); | |
7641 | call_args->push_back(a2); | |
7642 | call = Expression::make_call(copyref, call_args, false, loc); | |
7643 | gogo->lower_expression(function, inserter, &call); | |
7644 | gogo->flatten_expression(function, inserter, &call); | |
7645 | inserter->insert(Statement::make_statement(call, false)); | |
7646 | } | |
7647 | else | |
7648 | { | |
7649 | // For each argument: | |
7650 | // s1tmp[l1tmp+i] = a | |
7651 | unsigned long i = 0; | |
7652 | for (Expression_list::const_iterator pa = add->begin(); | |
7653 | pa != add->end(); | |
7654 | ++pa, ++i) | |
7655 | { | |
7656 | ref = Expression::make_temporary_reference(s1tmp, loc); | |
7657 | ref2 = Expression::make_temporary_reference(l1tmp, loc); | |
7658 | Expression* off = Expression::make_integer_ul(i, int_type, loc); | |
7659 | ref2 = Expression::make_binary(OPERATOR_PLUS, ref2, off, loc); | |
7660 | // FIXME: Mark this index as not requiring bounds checks. | |
7661 | lhs = Expression::make_index(ref, ref2, NULL, NULL, loc); | |
7662 | gogo->lower_expression(function, inserter, &lhs); | |
7663 | gogo->flatten_expression(function, inserter, &lhs); | |
7664 | assign = Statement::make_assignment(lhs, *pa, loc); | |
7665 | inserter->insert(assign); | |
7666 | } | |
7667 | } | |
7668 | ||
7669 | return Expression::make_temporary_reference(s1tmp, loc); | |
7670 | } | |
7671 | ||
a9182619 | 7672 | // Return whether an expression has an integer value. Report an error |
7673 | // if not. This is used when handling calls to the predeclared make | |
7674 | // function. | |
7675 | ||
7676 | bool | |
1ad00fd4 | 7677 | Builtin_call_expression::check_int_value(Expression* e, bool is_length) |
a9182619 | 7678 | { |
0c77715b | 7679 | Numeric_constant nc; |
1ad00fd4 | 7680 | if (e->numeric_constant_value(&nc)) |
a9182619 | 7681 | { |
1ad00fd4 | 7682 | unsigned long v; |
7683 | switch (nc.to_unsigned_long(&v)) | |
7684 | { | |
7685 | case Numeric_constant::NC_UL_VALID: | |
1b10c5e7 | 7686 | break; |
1ad00fd4 | 7687 | case Numeric_constant::NC_UL_NOTINT: |
631d5788 | 7688 | go_error_at(e->location(), "non-integer %s argument to make", |
7689 | is_length ? "len" : "cap"); | |
1ad00fd4 | 7690 | return false; |
7691 | case Numeric_constant::NC_UL_NEGATIVE: | |
631d5788 | 7692 | go_error_at(e->location(), "negative %s argument to make", |
7693 | is_length ? "len" : "cap"); | |
1ad00fd4 | 7694 | return false; |
7695 | case Numeric_constant::NC_UL_BIG: | |
7696 | // We don't want to give a compile-time error for a 64-bit | |
7697 | // value on a 32-bit target. | |
1b10c5e7 | 7698 | break; |
1ad00fd4 | 7699 | } |
1b10c5e7 | 7700 | |
7701 | mpz_t val; | |
7702 | if (!nc.to_int(&val)) | |
7703 | go_unreachable(); | |
7704 | int bits = mpz_sizeinbase(val, 2); | |
7705 | mpz_clear(val); | |
7706 | Type* int_type = Type::lookup_integer_type("int"); | |
7707 | if (bits >= int_type->integer_type()->bits()) | |
7708 | { | |
631d5788 | 7709 | go_error_at(e->location(), "%s argument too large for make", |
7710 | is_length ? "len" : "cap"); | |
1b10c5e7 | 7711 | return false; |
7712 | } | |
7713 | ||
7714 | return true; | |
a9182619 | 7715 | } |
7716 | ||
1ad00fd4 | 7717 | if (e->type()->integer_type() != NULL) |
7718 | return true; | |
7719 | ||
631d5788 | 7720 | go_error_at(e->location(), "non-integer %s argument to make", |
7721 | is_length ? "len" : "cap"); | |
a9182619 | 7722 | return false; |
7723 | } | |
7724 | ||
e440a328 | 7725 | // Return the type of the real or imag functions, given the type of |
fcbea5e4 | 7726 | // the argument. We need to map complex64 to float32 and complex128 |
7727 | // to float64, so it has to be done by name. This returns NULL if it | |
7728 | // can't figure out the type. | |
e440a328 | 7729 | |
7730 | Type* | |
7731 | Builtin_call_expression::real_imag_type(Type* arg_type) | |
7732 | { | |
7733 | if (arg_type == NULL || arg_type->is_abstract()) | |
7734 | return NULL; | |
7735 | Named_type* nt = arg_type->named_type(); | |
7736 | if (nt == NULL) | |
7737 | return NULL; | |
7738 | while (nt->real_type()->named_type() != NULL) | |
7739 | nt = nt->real_type()->named_type(); | |
48080209 | 7740 | if (nt->name() == "complex64") |
e440a328 | 7741 | return Type::lookup_float_type("float32"); |
7742 | else if (nt->name() == "complex128") | |
7743 | return Type::lookup_float_type("float64"); | |
7744 | else | |
7745 | return NULL; | |
7746 | } | |
7747 | ||
48080209 | 7748 | // Return the type of the complex function, given the type of one of the |
e440a328 | 7749 | // argments. Like real_imag_type, we have to map by name. |
7750 | ||
7751 | Type* | |
48080209 | 7752 | Builtin_call_expression::complex_type(Type* arg_type) |
e440a328 | 7753 | { |
7754 | if (arg_type == NULL || arg_type->is_abstract()) | |
7755 | return NULL; | |
7756 | Named_type* nt = arg_type->named_type(); | |
7757 | if (nt == NULL) | |
7758 | return NULL; | |
7759 | while (nt->real_type()->named_type() != NULL) | |
7760 | nt = nt->real_type()->named_type(); | |
48080209 | 7761 | if (nt->name() == "float32") |
e440a328 | 7762 | return Type::lookup_complex_type("complex64"); |
7763 | else if (nt->name() == "float64") | |
7764 | return Type::lookup_complex_type("complex128"); | |
7765 | else | |
7766 | return NULL; | |
7767 | } | |
7768 | ||
7769 | // Return a single argument, or NULL if there isn't one. | |
7770 | ||
7771 | Expression* | |
7772 | Builtin_call_expression::one_arg() const | |
7773 | { | |
7774 | const Expression_list* args = this->args(); | |
aa615cb3 | 7775 | if (args == NULL || args->size() != 1) |
e440a328 | 7776 | return NULL; |
7777 | return args->front(); | |
7778 | } | |
7779 | ||
83921647 | 7780 | // A traversal class which looks for a call or receive expression. |
7781 | ||
7782 | class Find_call_expression : public Traverse | |
7783 | { | |
7784 | public: | |
7785 | Find_call_expression() | |
7786 | : Traverse(traverse_expressions), | |
7787 | found_(false) | |
7788 | { } | |
7789 | ||
7790 | int | |
7791 | expression(Expression**); | |
7792 | ||
7793 | bool | |
7794 | found() | |
7795 | { return this->found_; } | |
7796 | ||
7797 | private: | |
7798 | bool found_; | |
7799 | }; | |
7800 | ||
7801 | int | |
7802 | Find_call_expression::expression(Expression** pexpr) | |
7803 | { | |
7804 | if ((*pexpr)->call_expression() != NULL | |
7805 | || (*pexpr)->receive_expression() != NULL) | |
7806 | { | |
7807 | this->found_ = true; | |
7808 | return TRAVERSE_EXIT; | |
7809 | } | |
7810 | return TRAVERSE_CONTINUE; | |
7811 | } | |
7812 | ||
7813 | // Return whether this is constant: len of a string constant, or len | |
7814 | // or cap of an array, or unsafe.Sizeof, unsafe.Offsetof, | |
7815 | // unsafe.Alignof. | |
e440a328 | 7816 | |
7817 | bool | |
7818 | Builtin_call_expression::do_is_constant() const | |
7819 | { | |
12e69faa | 7820 | if (this->is_error_expression()) |
7821 | return true; | |
e440a328 | 7822 | switch (this->code_) |
7823 | { | |
7824 | case BUILTIN_LEN: | |
7825 | case BUILTIN_CAP: | |
7826 | { | |
0f914071 | 7827 | if (this->seen_) |
7828 | return false; | |
7829 | ||
e440a328 | 7830 | Expression* arg = this->one_arg(); |
7831 | if (arg == NULL) | |
7832 | return false; | |
7833 | Type* arg_type = arg->type(); | |
7834 | ||
7835 | if (arg_type->points_to() != NULL | |
7836 | && arg_type->points_to()->array_type() != NULL | |
411eb89e | 7837 | && !arg_type->points_to()->is_slice_type()) |
e440a328 | 7838 | arg_type = arg_type->points_to(); |
7839 | ||
83921647 | 7840 | // The len and cap functions are only constant if there are no |
7841 | // function calls or channel operations in the arguments. | |
7842 | // Otherwise we have to make the call. | |
7843 | if (!arg->is_constant()) | |
7844 | { | |
7845 | Find_call_expression find_call; | |
7846 | Expression::traverse(&arg, &find_call); | |
7847 | if (find_call.found()) | |
7848 | return false; | |
7849 | } | |
7850 | ||
e440a328 | 7851 | if (arg_type->array_type() != NULL |
7852 | && arg_type->array_type()->length() != NULL) | |
0f914071 | 7853 | return true; |
e440a328 | 7854 | |
7855 | if (this->code_ == BUILTIN_LEN && arg_type->is_string_type()) | |
0f914071 | 7856 | { |
7857 | this->seen_ = true; | |
7858 | bool ret = arg->is_constant(); | |
7859 | this->seen_ = false; | |
7860 | return ret; | |
7861 | } | |
e440a328 | 7862 | } |
7863 | break; | |
7864 | ||
7865 | case BUILTIN_SIZEOF: | |
7866 | case BUILTIN_ALIGNOF: | |
7867 | return this->one_arg() != NULL; | |
7868 | ||
7869 | case BUILTIN_OFFSETOF: | |
7870 | { | |
7871 | Expression* arg = this->one_arg(); | |
7872 | if (arg == NULL) | |
7873 | return false; | |
7874 | return arg->field_reference_expression() != NULL; | |
7875 | } | |
7876 | ||
48080209 | 7877 | case BUILTIN_COMPLEX: |
e440a328 | 7878 | { |
7879 | const Expression_list* args = this->args(); | |
7880 | if (args != NULL && args->size() == 2) | |
7881 | return args->front()->is_constant() && args->back()->is_constant(); | |
7882 | } | |
7883 | break; | |
7884 | ||
7885 | case BUILTIN_REAL: | |
7886 | case BUILTIN_IMAG: | |
7887 | { | |
7888 | Expression* arg = this->one_arg(); | |
7889 | return arg != NULL && arg->is_constant(); | |
7890 | } | |
7891 | ||
7892 | default: | |
7893 | break; | |
7894 | } | |
7895 | ||
7896 | return false; | |
7897 | } | |
7898 | ||
0c77715b | 7899 | // Return a numeric constant if possible. |
e440a328 | 7900 | |
7901 | bool | |
0c77715b | 7902 | Builtin_call_expression::do_numeric_constant_value(Numeric_constant* nc) const |
e440a328 | 7903 | { |
7904 | if (this->code_ == BUILTIN_LEN | |
7905 | || this->code_ == BUILTIN_CAP) | |
7906 | { | |
7907 | Expression* arg = this->one_arg(); | |
7908 | if (arg == NULL) | |
7909 | return false; | |
7910 | Type* arg_type = arg->type(); | |
7911 | ||
7912 | if (this->code_ == BUILTIN_LEN && arg_type->is_string_type()) | |
7913 | { | |
7914 | std::string sval; | |
7915 | if (arg->string_constant_value(&sval)) | |
7916 | { | |
0c77715b | 7917 | nc->set_unsigned_long(Type::lookup_integer_type("int"), |
7918 | sval.length()); | |
e440a328 | 7919 | return true; |
7920 | } | |
7921 | } | |
7922 | ||
7923 | if (arg_type->points_to() != NULL | |
7924 | && arg_type->points_to()->array_type() != NULL | |
411eb89e | 7925 | && !arg_type->points_to()->is_slice_type()) |
e440a328 | 7926 | arg_type = arg_type->points_to(); |
7927 | ||
7928 | if (arg_type->array_type() != NULL | |
7929 | && arg_type->array_type()->length() != NULL) | |
7930 | { | |
0f914071 | 7931 | if (this->seen_) |
7932 | return false; | |
e440a328 | 7933 | Expression* e = arg_type->array_type()->length(); |
0f914071 | 7934 | this->seen_ = true; |
0c77715b | 7935 | bool r = e->numeric_constant_value(nc); |
0f914071 | 7936 | this->seen_ = false; |
7937 | if (r) | |
e440a328 | 7938 | { |
0c77715b | 7939 | if (!nc->set_type(Type::lookup_integer_type("int"), false, |
7940 | this->location())) | |
7941 | r = false; | |
e440a328 | 7942 | } |
0c77715b | 7943 | return r; |
e440a328 | 7944 | } |
7945 | } | |
7946 | else if (this->code_ == BUILTIN_SIZEOF | |
7947 | || this->code_ == BUILTIN_ALIGNOF) | |
7948 | { | |
7949 | Expression* arg = this->one_arg(); | |
7950 | if (arg == NULL) | |
7951 | return false; | |
7952 | Type* arg_type = arg->type(); | |
5c13bd80 | 7953 | if (arg_type->is_error()) |
e440a328 | 7954 | return false; |
7955 | if (arg_type->is_abstract()) | |
7956 | return false; | |
2c809f8f | 7957 | if (this->seen_) |
7958 | return false; | |
927a01eb | 7959 | |
3f378015 | 7960 | int64_t ret; |
e440a328 | 7961 | if (this->code_ == BUILTIN_SIZEOF) |
7962 | { | |
2c809f8f | 7963 | this->seen_ = true; |
7964 | bool ok = arg_type->backend_type_size(this->gogo_, &ret); | |
7965 | this->seen_ = false; | |
7966 | if (!ok) | |
e440a328 | 7967 | return false; |
7968 | } | |
7969 | else if (this->code_ == BUILTIN_ALIGNOF) | |
7970 | { | |
2c809f8f | 7971 | bool ok; |
7972 | this->seen_ = true; | |
637bd3af | 7973 | if (arg->field_reference_expression() == NULL) |
2c809f8f | 7974 | ok = arg_type->backend_type_align(this->gogo_, &ret); |
637bd3af | 7975 | else |
e440a328 | 7976 | { |
7977 | // Calling unsafe.Alignof(s.f) returns the alignment of | |
7978 | // the type of f when it is used as a field in a struct. | |
2c809f8f | 7979 | ok = arg_type->backend_type_field_align(this->gogo_, &ret); |
e440a328 | 7980 | } |
2c809f8f | 7981 | this->seen_ = false; |
7982 | if (!ok) | |
7983 | return false; | |
e440a328 | 7984 | } |
7985 | else | |
c3e6f413 | 7986 | go_unreachable(); |
927a01eb | 7987 | |
3f378015 | 7988 | mpz_t zval; |
7989 | set_mpz_from_int64(&zval, ret); | |
7990 | nc->set_int(Type::lookup_integer_type("uintptr"), zval); | |
7991 | mpz_clear(zval); | |
e440a328 | 7992 | return true; |
7993 | } | |
7994 | else if (this->code_ == BUILTIN_OFFSETOF) | |
7995 | { | |
7996 | Expression* arg = this->one_arg(); | |
7997 | if (arg == NULL) | |
7998 | return false; | |
7999 | Field_reference_expression* farg = arg->field_reference_expression(); | |
8000 | if (farg == NULL) | |
8001 | return false; | |
2c809f8f | 8002 | if (this->seen_) |
8003 | return false; | |
8004 | ||
3f378015 | 8005 | int64_t total_offset = 0; |
9a4bd570 | 8006 | while (true) |
8007 | { | |
8008 | Expression* struct_expr = farg->expr(); | |
8009 | Type* st = struct_expr->type(); | |
8010 | if (st->struct_type() == NULL) | |
8011 | return false; | |
8012 | if (st->named_type() != NULL) | |
8013 | st->named_type()->convert(this->gogo_); | |
3f378015 | 8014 | int64_t offset; |
2c809f8f | 8015 | this->seen_ = true; |
8016 | bool ok = st->struct_type()->backend_field_offset(this->gogo_, | |
8017 | farg->field_index(), | |
8018 | &offset); | |
8019 | this->seen_ = false; | |
8020 | if (!ok) | |
8021 | return false; | |
9a4bd570 | 8022 | total_offset += offset; |
8023 | if (farg->implicit() && struct_expr->field_reference_expression() != NULL) | |
8024 | { | |
8025 | // Go up until we reach the original base. | |
8026 | farg = struct_expr->field_reference_expression(); | |
8027 | continue; | |
8028 | } | |
8029 | break; | |
8030 | } | |
3f378015 | 8031 | mpz_t zval; |
8032 | set_mpz_from_int64(&zval, total_offset); | |
8033 | nc->set_int(Type::lookup_integer_type("uintptr"), zval); | |
8034 | mpz_clear(zval); | |
e440a328 | 8035 | return true; |
8036 | } | |
0c77715b | 8037 | else if (this->code_ == BUILTIN_REAL || this->code_ == BUILTIN_IMAG) |
e440a328 | 8038 | { |
8039 | Expression* arg = this->one_arg(); | |
8040 | if (arg == NULL) | |
8041 | return false; | |
8042 | ||
0c77715b | 8043 | Numeric_constant argnc; |
8044 | if (!arg->numeric_constant_value(&argnc)) | |
8045 | return false; | |
8046 | ||
fcbea5e4 | 8047 | mpc_t val; |
8048 | if (!argnc.to_complex(&val)) | |
0c77715b | 8049 | return false; |
e440a328 | 8050 | |
0c77715b | 8051 | Type* type = Builtin_call_expression::real_imag_type(argnc.type()); |
8052 | if (this->code_ == BUILTIN_REAL) | |
fcbea5e4 | 8053 | nc->set_float(type, mpc_realref(val)); |
0c77715b | 8054 | else |
fcbea5e4 | 8055 | nc->set_float(type, mpc_imagref(val)); |
8056 | mpc_clear(val); | |
0c77715b | 8057 | return true; |
e440a328 | 8058 | } |
0c77715b | 8059 | else if (this->code_ == BUILTIN_COMPLEX) |
e440a328 | 8060 | { |
8061 | const Expression_list* args = this->args(); | |
8062 | if (args == NULL || args->size() != 2) | |
8063 | return false; | |
8064 | ||
0c77715b | 8065 | Numeric_constant rnc; |
8066 | if (!args->front()->numeric_constant_value(&rnc)) | |
8067 | return false; | |
8068 | Numeric_constant inc; | |
8069 | if (!args->back()->numeric_constant_value(&inc)) | |
8070 | return false; | |
8071 | ||
8072 | if (rnc.type() != NULL | |
8073 | && !rnc.type()->is_abstract() | |
8074 | && inc.type() != NULL | |
8075 | && !inc.type()->is_abstract() | |
8076 | && !Type::are_identical(rnc.type(), inc.type(), false, NULL)) | |
8077 | return false; | |
8078 | ||
e440a328 | 8079 | mpfr_t r; |
0c77715b | 8080 | if (!rnc.to_float(&r)) |
8081 | return false; | |
8082 | mpfr_t i; | |
8083 | if (!inc.to_float(&i)) | |
e440a328 | 8084 | { |
8085 | mpfr_clear(r); | |
8086 | return false; | |
8087 | } | |
8088 | ||
0c77715b | 8089 | Type* arg_type = rnc.type(); |
8090 | if (arg_type == NULL || arg_type->is_abstract()) | |
8091 | arg_type = inc.type(); | |
e440a328 | 8092 | |
fcbea5e4 | 8093 | mpc_t val; |
8094 | mpc_init2(val, mpc_precision); | |
8095 | mpc_set_fr_fr(val, r, i, MPC_RNDNN); | |
e440a328 | 8096 | mpfr_clear(r); |
8097 | mpfr_clear(i); | |
8098 | ||
fcbea5e4 | 8099 | Type* type = Builtin_call_expression::complex_type(arg_type); |
8100 | nc->set_complex(type, val); | |
8101 | ||
8102 | mpc_clear(val); | |
8103 | ||
0c77715b | 8104 | return true; |
e440a328 | 8105 | } |
8106 | ||
8107 | return false; | |
8108 | } | |
8109 | ||
a7549a6a | 8110 | // Give an error if we are discarding the value of an expression which |
8111 | // should not normally be discarded. We don't give an error for | |
8112 | // discarding the value of an ordinary function call, but we do for | |
8113 | // builtin functions, purely for consistency with the gc compiler. | |
8114 | ||
4f2138d7 | 8115 | bool |
a7549a6a | 8116 | Builtin_call_expression::do_discarding_value() |
8117 | { | |
8118 | switch (this->code_) | |
8119 | { | |
8120 | case BUILTIN_INVALID: | |
8121 | default: | |
8122 | go_unreachable(); | |
8123 | ||
8124 | case BUILTIN_APPEND: | |
8125 | case BUILTIN_CAP: | |
8126 | case BUILTIN_COMPLEX: | |
8127 | case BUILTIN_IMAG: | |
8128 | case BUILTIN_LEN: | |
8129 | case BUILTIN_MAKE: | |
8130 | case BUILTIN_NEW: | |
8131 | case BUILTIN_REAL: | |
8132 | case BUILTIN_ALIGNOF: | |
8133 | case BUILTIN_OFFSETOF: | |
8134 | case BUILTIN_SIZEOF: | |
8135 | this->unused_value_error(); | |
4f2138d7 | 8136 | return false; |
a7549a6a | 8137 | |
8138 | case BUILTIN_CLOSE: | |
8139 | case BUILTIN_COPY: | |
1cce762f | 8140 | case BUILTIN_DELETE: |
a7549a6a | 8141 | case BUILTIN_PANIC: |
8142 | case BUILTIN_PRINT: | |
8143 | case BUILTIN_PRINTLN: | |
8144 | case BUILTIN_RECOVER: | |
4f2138d7 | 8145 | return true; |
a7549a6a | 8146 | } |
8147 | } | |
8148 | ||
e440a328 | 8149 | // Return the type. |
8150 | ||
8151 | Type* | |
8152 | Builtin_call_expression::do_type() | |
8153 | { | |
79651b1f | 8154 | if (this->is_error_expression()) |
8155 | return Type::make_error_type(); | |
e440a328 | 8156 | switch (this->code_) |
8157 | { | |
8158 | case BUILTIN_INVALID: | |
8159 | default: | |
79651b1f | 8160 | return Type::make_error_type(); |
e440a328 | 8161 | |
8162 | case BUILTIN_NEW: | |
8163 | case BUILTIN_MAKE: | |
8164 | { | |
8165 | const Expression_list* args = this->args(); | |
8166 | if (args == NULL || args->empty()) | |
8167 | return Type::make_error_type(); | |
8168 | return Type::make_pointer_type(args->front()->type()); | |
8169 | } | |
8170 | ||
8171 | case BUILTIN_CAP: | |
8172 | case BUILTIN_COPY: | |
8173 | case BUILTIN_LEN: | |
7ba86326 | 8174 | return Type::lookup_integer_type("int"); |
8175 | ||
e440a328 | 8176 | case BUILTIN_ALIGNOF: |
8177 | case BUILTIN_OFFSETOF: | |
8178 | case BUILTIN_SIZEOF: | |
7ba86326 | 8179 | return Type::lookup_integer_type("uintptr"); |
e440a328 | 8180 | |
8181 | case BUILTIN_CLOSE: | |
1cce762f | 8182 | case BUILTIN_DELETE: |
e440a328 | 8183 | case BUILTIN_PANIC: |
8184 | case BUILTIN_PRINT: | |
8185 | case BUILTIN_PRINTLN: | |
8186 | return Type::make_void_type(); | |
8187 | ||
e440a328 | 8188 | case BUILTIN_RECOVER: |
823c7e3d | 8189 | return Type::make_empty_interface_type(Linemap::predeclared_location()); |
e440a328 | 8190 | |
8191 | case BUILTIN_APPEND: | |
8192 | { | |
8193 | const Expression_list* args = this->args(); | |
8194 | if (args == NULL || args->empty()) | |
8195 | return Type::make_error_type(); | |
3ff4863b | 8196 | Type *ret = args->front()->type(); |
8197 | if (!ret->is_slice_type()) | |
8198 | return Type::make_error_type(); | |
8199 | return ret; | |
e440a328 | 8200 | } |
8201 | ||
8202 | case BUILTIN_REAL: | |
8203 | case BUILTIN_IMAG: | |
8204 | { | |
8205 | Expression* arg = this->one_arg(); | |
8206 | if (arg == NULL) | |
8207 | return Type::make_error_type(); | |
8208 | Type* t = arg->type(); | |
8209 | if (t->is_abstract()) | |
8210 | t = t->make_non_abstract_type(); | |
8211 | t = Builtin_call_expression::real_imag_type(t); | |
8212 | if (t == NULL) | |
8213 | t = Type::make_error_type(); | |
8214 | return t; | |
8215 | } | |
8216 | ||
48080209 | 8217 | case BUILTIN_COMPLEX: |
e440a328 | 8218 | { |
8219 | const Expression_list* args = this->args(); | |
8220 | if (args == NULL || args->size() != 2) | |
8221 | return Type::make_error_type(); | |
8222 | Type* t = args->front()->type(); | |
8223 | if (t->is_abstract()) | |
8224 | { | |
8225 | t = args->back()->type(); | |
8226 | if (t->is_abstract()) | |
8227 | t = t->make_non_abstract_type(); | |
8228 | } | |
48080209 | 8229 | t = Builtin_call_expression::complex_type(t); |
e440a328 | 8230 | if (t == NULL) |
8231 | t = Type::make_error_type(); | |
8232 | return t; | |
8233 | } | |
8234 | } | |
8235 | } | |
8236 | ||
8237 | // Determine the type. | |
8238 | ||
8239 | void | |
8240 | Builtin_call_expression::do_determine_type(const Type_context* context) | |
8241 | { | |
fb94b0ca | 8242 | if (!this->determining_types()) |
8243 | return; | |
8244 | ||
e440a328 | 8245 | this->fn()->determine_type_no_context(); |
8246 | ||
8247 | const Expression_list* args = this->args(); | |
8248 | ||
8249 | bool is_print; | |
8250 | Type* arg_type = NULL; | |
321e5ad2 | 8251 | Type* trailing_arg_types = NULL; |
e440a328 | 8252 | switch (this->code_) |
8253 | { | |
8254 | case BUILTIN_PRINT: | |
8255 | case BUILTIN_PRINTLN: | |
8256 | // Do not force a large integer constant to "int". | |
8257 | is_print = true; | |
8258 | break; | |
8259 | ||
8260 | case BUILTIN_REAL: | |
8261 | case BUILTIN_IMAG: | |
48080209 | 8262 | arg_type = Builtin_call_expression::complex_type(context->type); |
f6bc81e6 | 8263 | if (arg_type == NULL) |
8264 | arg_type = Type::lookup_complex_type("complex128"); | |
e440a328 | 8265 | is_print = false; |
8266 | break; | |
8267 | ||
48080209 | 8268 | case BUILTIN_COMPLEX: |
e440a328 | 8269 | { |
48080209 | 8270 | // For the complex function the type of one operand can |
e440a328 | 8271 | // determine the type of the other, as in a binary expression. |
8272 | arg_type = Builtin_call_expression::real_imag_type(context->type); | |
f6bc81e6 | 8273 | if (arg_type == NULL) |
8274 | arg_type = Type::lookup_float_type("float64"); | |
e440a328 | 8275 | if (args != NULL && args->size() == 2) |
8276 | { | |
8277 | Type* t1 = args->front()->type(); | |
c849bb59 | 8278 | Type* t2 = args->back()->type(); |
e440a328 | 8279 | if (!t1->is_abstract()) |
8280 | arg_type = t1; | |
8281 | else if (!t2->is_abstract()) | |
8282 | arg_type = t2; | |
8283 | } | |
8284 | is_print = false; | |
8285 | } | |
8286 | break; | |
8287 | ||
321e5ad2 | 8288 | case BUILTIN_APPEND: |
8289 | if (!this->is_varargs() | |
8290 | && args != NULL | |
8291 | && !args->empty() | |
8292 | && args->front()->type()->is_slice_type()) | |
8293 | trailing_arg_types = | |
8294 | args->front()->type()->array_type()->element_type(); | |
8295 | is_print = false; | |
8296 | break; | |
8297 | ||
e440a328 | 8298 | default: |
8299 | is_print = false; | |
8300 | break; | |
8301 | } | |
8302 | ||
8303 | if (args != NULL) | |
8304 | { | |
8305 | for (Expression_list::const_iterator pa = args->begin(); | |
8306 | pa != args->end(); | |
8307 | ++pa) | |
8308 | { | |
8309 | Type_context subcontext; | |
8310 | subcontext.type = arg_type; | |
8311 | ||
8312 | if (is_print) | |
8313 | { | |
8314 | // We want to print large constants, we so can't just | |
8315 | // use the appropriate nonabstract type. Use uint64 for | |
8316 | // an integer if we know it is nonnegative, otherwise | |
8317 | // use int64 for a integer, otherwise use float64 for a | |
8318 | // float or complex128 for a complex. | |
8319 | Type* want_type = NULL; | |
8320 | Type* atype = (*pa)->type(); | |
8321 | if (atype->is_abstract()) | |
8322 | { | |
8323 | if (atype->integer_type() != NULL) | |
8324 | { | |
0c77715b | 8325 | Numeric_constant nc; |
8326 | if (this->numeric_constant_value(&nc)) | |
8327 | { | |
8328 | mpz_t val; | |
8329 | if (nc.to_int(&val)) | |
8330 | { | |
8331 | if (mpz_sgn(val) >= 0) | |
8332 | want_type = Type::lookup_integer_type("uint64"); | |
8333 | mpz_clear(val); | |
8334 | } | |
8335 | } | |
8336 | if (want_type == NULL) | |
e440a328 | 8337 | want_type = Type::lookup_integer_type("int64"); |
e440a328 | 8338 | } |
8339 | else if (atype->float_type() != NULL) | |
8340 | want_type = Type::lookup_float_type("float64"); | |
8341 | else if (atype->complex_type() != NULL) | |
8342 | want_type = Type::lookup_complex_type("complex128"); | |
8343 | else if (atype->is_abstract_string_type()) | |
8344 | want_type = Type::lookup_string_type(); | |
8345 | else if (atype->is_abstract_boolean_type()) | |
8346 | want_type = Type::lookup_bool_type(); | |
8347 | else | |
c3e6f413 | 8348 | go_unreachable(); |
e440a328 | 8349 | subcontext.type = want_type; |
8350 | } | |
8351 | } | |
8352 | ||
8353 | (*pa)->determine_type(&subcontext); | |
321e5ad2 | 8354 | |
8355 | if (trailing_arg_types != NULL) | |
8356 | { | |
8357 | arg_type = trailing_arg_types; | |
8358 | trailing_arg_types = NULL; | |
8359 | } | |
e440a328 | 8360 | } |
8361 | } | |
8362 | } | |
8363 | ||
8364 | // If there is exactly one argument, return true. Otherwise give an | |
8365 | // error message and return false. | |
8366 | ||
8367 | bool | |
8368 | Builtin_call_expression::check_one_arg() | |
8369 | { | |
8370 | const Expression_list* args = this->args(); | |
8371 | if (args == NULL || args->size() < 1) | |
8372 | { | |
8373 | this->report_error(_("not enough arguments")); | |
8374 | return false; | |
8375 | } | |
8376 | else if (args->size() > 1) | |
8377 | { | |
8378 | this->report_error(_("too many arguments")); | |
8379 | return false; | |
8380 | } | |
8381 | if (args->front()->is_error_expression() | |
5c13bd80 | 8382 | || args->front()->type()->is_error()) |
e440a328 | 8383 | { |
8384 | this->set_is_error(); | |
8385 | return false; | |
8386 | } | |
8387 | return true; | |
8388 | } | |
8389 | ||
8390 | // Check argument types for a builtin function. | |
8391 | ||
8392 | void | |
8393 | Builtin_call_expression::do_check_types(Gogo*) | |
8394 | { | |
375646ea | 8395 | if (this->is_error_expression()) |
8396 | return; | |
e440a328 | 8397 | switch (this->code_) |
8398 | { | |
8399 | case BUILTIN_INVALID: | |
8400 | case BUILTIN_NEW: | |
8401 | case BUILTIN_MAKE: | |
cd238b8d | 8402 | case BUILTIN_DELETE: |
e440a328 | 8403 | return; |
8404 | ||
8405 | case BUILTIN_LEN: | |
8406 | case BUILTIN_CAP: | |
8407 | { | |
8408 | // The single argument may be either a string or an array or a | |
8409 | // map or a channel, or a pointer to a closed array. | |
8410 | if (this->check_one_arg()) | |
8411 | { | |
8412 | Type* arg_type = this->one_arg()->type(); | |
8413 | if (arg_type->points_to() != NULL | |
8414 | && arg_type->points_to()->array_type() != NULL | |
411eb89e | 8415 | && !arg_type->points_to()->is_slice_type()) |
e440a328 | 8416 | arg_type = arg_type->points_to(); |
8417 | if (this->code_ == BUILTIN_CAP) | |
8418 | { | |
5c13bd80 | 8419 | if (!arg_type->is_error() |
e440a328 | 8420 | && arg_type->array_type() == NULL |
8421 | && arg_type->channel_type() == NULL) | |
8422 | this->report_error(_("argument must be array or slice " | |
8423 | "or channel")); | |
8424 | } | |
8425 | else | |
8426 | { | |
5c13bd80 | 8427 | if (!arg_type->is_error() |
e440a328 | 8428 | && !arg_type->is_string_type() |
8429 | && arg_type->array_type() == NULL | |
8430 | && arg_type->map_type() == NULL | |
8431 | && arg_type->channel_type() == NULL) | |
8432 | this->report_error(_("argument must be string or " | |
8433 | "array or slice or map or channel")); | |
8434 | } | |
8435 | } | |
8436 | } | |
8437 | break; | |
8438 | ||
8439 | case BUILTIN_PRINT: | |
8440 | case BUILTIN_PRINTLN: | |
8441 | { | |
8442 | const Expression_list* args = this->args(); | |
8443 | if (args == NULL) | |
8444 | { | |
8445 | if (this->code_ == BUILTIN_PRINT) | |
631d5788 | 8446 | go_warning_at(this->location(), 0, |
e440a328 | 8447 | "no arguments for builtin function %<%s%>", |
8448 | (this->code_ == BUILTIN_PRINT | |
8449 | ? "print" | |
8450 | : "println")); | |
8451 | } | |
8452 | else | |
8453 | { | |
8454 | for (Expression_list::const_iterator p = args->begin(); | |
8455 | p != args->end(); | |
8456 | ++p) | |
8457 | { | |
8458 | Type* type = (*p)->type(); | |
5c13bd80 | 8459 | if (type->is_error() |
e440a328 | 8460 | || type->is_string_type() |
8461 | || type->integer_type() != NULL | |
8462 | || type->float_type() != NULL | |
8463 | || type->complex_type() != NULL | |
8464 | || type->is_boolean_type() | |
8465 | || type->points_to() != NULL | |
8466 | || type->interface_type() != NULL | |
8467 | || type->channel_type() != NULL | |
8468 | || type->map_type() != NULL | |
8469 | || type->function_type() != NULL | |
411eb89e | 8470 | || type->is_slice_type()) |
e440a328 | 8471 | ; |
acf8e158 | 8472 | else if ((*p)->is_type_expression()) |
8473 | { | |
8474 | // If this is a type expression it's going to give | |
8475 | // an error anyhow, so we don't need one here. | |
8476 | } | |
e440a328 | 8477 | else |
8478 | this->report_error(_("unsupported argument type to " | |
8479 | "builtin function")); | |
8480 | } | |
8481 | } | |
8482 | } | |
8483 | break; | |
8484 | ||
8485 | case BUILTIN_CLOSE: | |
e440a328 | 8486 | if (this->check_one_arg()) |
8487 | { | |
8488 | if (this->one_arg()->type()->channel_type() == NULL) | |
8489 | this->report_error(_("argument must be channel")); | |
5202d986 | 8490 | else if (!this->one_arg()->type()->channel_type()->may_send()) |
8491 | this->report_error(_("cannot close receive-only channel")); | |
e440a328 | 8492 | } |
8493 | break; | |
8494 | ||
8495 | case BUILTIN_PANIC: | |
8496 | case BUILTIN_SIZEOF: | |
8497 | case BUILTIN_ALIGNOF: | |
8498 | this->check_one_arg(); | |
8499 | break; | |
8500 | ||
8501 | case BUILTIN_RECOVER: | |
6334270b | 8502 | if (this->args() != NULL |
8503 | && !this->args()->empty() | |
8504 | && !this->recover_arg_is_set_) | |
e440a328 | 8505 | this->report_error(_("too many arguments")); |
8506 | break; | |
8507 | ||
8508 | case BUILTIN_OFFSETOF: | |
8509 | if (this->check_one_arg()) | |
8510 | { | |
8511 | Expression* arg = this->one_arg(); | |
8512 | if (arg->field_reference_expression() == NULL) | |
8513 | this->report_error(_("argument must be a field reference")); | |
8514 | } | |
8515 | break; | |
8516 | ||
8517 | case BUILTIN_COPY: | |
8518 | { | |
8519 | const Expression_list* args = this->args(); | |
8520 | if (args == NULL || args->size() < 2) | |
8521 | { | |
8522 | this->report_error(_("not enough arguments")); | |
8523 | break; | |
8524 | } | |
8525 | else if (args->size() > 2) | |
8526 | { | |
8527 | this->report_error(_("too many arguments")); | |
8528 | break; | |
8529 | } | |
8530 | Type* arg1_type = args->front()->type(); | |
8531 | Type* arg2_type = args->back()->type(); | |
5c13bd80 | 8532 | if (arg1_type->is_error() || arg2_type->is_error()) |
6bebb39d | 8533 | { |
8534 | this->set_is_error(); | |
8535 | break; | |
8536 | } | |
e440a328 | 8537 | |
8538 | Type* e1; | |
411eb89e | 8539 | if (arg1_type->is_slice_type()) |
e440a328 | 8540 | e1 = arg1_type->array_type()->element_type(); |
8541 | else | |
8542 | { | |
8543 | this->report_error(_("left argument must be a slice")); | |
8544 | break; | |
8545 | } | |
8546 | ||
411eb89e | 8547 | if (arg2_type->is_slice_type()) |
60963afd | 8548 | { |
8549 | Type* e2 = arg2_type->array_type()->element_type(); | |
8550 | if (!Type::are_identical(e1, e2, true, NULL)) | |
8551 | this->report_error(_("element types must be the same")); | |
8552 | } | |
e440a328 | 8553 | else if (arg2_type->is_string_type()) |
e440a328 | 8554 | { |
60963afd | 8555 | if (e1->integer_type() == NULL || !e1->integer_type()->is_byte()) |
8556 | this->report_error(_("first argument must be []byte")); | |
e440a328 | 8557 | } |
60963afd | 8558 | else |
8559 | this->report_error(_("second argument must be slice or string")); | |
e440a328 | 8560 | } |
8561 | break; | |
8562 | ||
8563 | case BUILTIN_APPEND: | |
8564 | { | |
8565 | const Expression_list* args = this->args(); | |
321e5ad2 | 8566 | if (args == NULL || args->empty()) |
e440a328 | 8567 | { |
8568 | this->report_error(_("not enough arguments")); | |
8569 | break; | |
8570 | } | |
321e5ad2 | 8571 | |
8572 | Type* slice_type = args->front()->type(); | |
8573 | if (!slice_type->is_slice_type()) | |
6bebb39d | 8574 | { |
321e5ad2 | 8575 | if (slice_type->is_error_type()) |
8576 | break; | |
8577 | if (slice_type->is_nil_type()) | |
8578 | go_error_at(args->front()->location(), "use of untyped nil"); | |
8579 | else | |
8580 | go_error_at(args->front()->location(), | |
8581 | "argument 1 must be a slice"); | |
6bebb39d | 8582 | this->set_is_error(); |
8583 | break; | |
8584 | } | |
cd238b8d | 8585 | |
321e5ad2 | 8586 | Type* element_type = slice_type->array_type()->element_type(); |
8587 | if (this->is_varargs()) | |
4fd4fcf4 | 8588 | { |
321e5ad2 | 8589 | if (!args->back()->type()->is_slice_type() |
8590 | && !args->back()->type()->is_string_type()) | |
8591 | { | |
8592 | go_error_at(args->back()->location(), | |
8593 | "invalid use of %<...%> with non-slice/non-string"); | |
8594 | this->set_is_error(); | |
8595 | break; | |
8596 | } | |
4fd4fcf4 | 8597 | |
321e5ad2 | 8598 | if (args->size() < 2) |
8599 | { | |
8600 | this->report_error(_("not enough arguments")); | |
8601 | break; | |
8602 | } | |
8603 | if (args->size() > 2) | |
8604 | { | |
8605 | this->report_error(_("too many arguments")); | |
8606 | break; | |
8607 | } | |
8608 | ||
8609 | if (args->back()->type()->is_string_type() | |
8610 | && element_type->integer_type() != NULL | |
8611 | && element_type->integer_type()->is_byte()) | |
8612 | { | |
8613 | // Permit append(s1, s2...) when s1 is a slice of | |
8614 | // bytes and s2 is a string type. | |
8615 | } | |
e440a328 | 8616 | else |
8617 | { | |
321e5ad2 | 8618 | // We have to test for assignment compatibility to a |
8619 | // slice of the element type, which is not necessarily | |
8620 | // the same as the type of the first argument: the | |
8621 | // first argument might have a named type. | |
8622 | Type* check_type = Type::make_array_type(element_type, NULL); | |
8623 | std::string reason; | |
8624 | if (!Type::are_assignable(check_type, args->back()->type(), | |
8625 | &reason)) | |
8626 | { | |
8627 | if (reason.empty()) | |
8628 | go_error_at(args->back()->location(), | |
8629 | "argument 2 has invalid type"); | |
8630 | else | |
8631 | go_error_at(args->back()->location(), | |
8632 | "argument 2 has invalid type (%s)", | |
8633 | reason.c_str()); | |
8634 | this->set_is_error(); | |
8635 | break; | |
8636 | } | |
8637 | } | |
8638 | } | |
8639 | else | |
8640 | { | |
8641 | Expression_list::const_iterator pa = args->begin(); | |
8642 | int i = 2; | |
8643 | for (++pa; pa != args->end(); ++pa, ++i) | |
8644 | { | |
8645 | std::string reason; | |
8646 | if (!Type::are_assignable(element_type, (*pa)->type(), | |
8647 | &reason)) | |
8648 | { | |
8649 | if (reason.empty()) | |
8650 | go_error_at((*pa)->location(), | |
8651 | "argument %d has incompatible type", i); | |
8652 | else | |
8653 | go_error_at((*pa)->location(), | |
8654 | "argument %d has incompatible type (%s)", | |
8655 | i, reason.c_str()); | |
8656 | this->set_is_error(); | |
8657 | } | |
e440a328 | 8658 | } |
8659 | } | |
e440a328 | 8660 | } |
321e5ad2 | 8661 | break; |
e440a328 | 8662 | |
8663 | case BUILTIN_REAL: | |
8664 | case BUILTIN_IMAG: | |
8665 | if (this->check_one_arg()) | |
8666 | { | |
8667 | if (this->one_arg()->type()->complex_type() == NULL) | |
8668 | this->report_error(_("argument must have complex type")); | |
8669 | } | |
8670 | break; | |
8671 | ||
48080209 | 8672 | case BUILTIN_COMPLEX: |
e440a328 | 8673 | { |
8674 | const Expression_list* args = this->args(); | |
8675 | if (args == NULL || args->size() < 2) | |
8676 | this->report_error(_("not enough arguments")); | |
8677 | else if (args->size() > 2) | |
8678 | this->report_error(_("too many arguments")); | |
8679 | else if (args->front()->is_error_expression() | |
5c13bd80 | 8680 | || args->front()->type()->is_error() |
e440a328 | 8681 | || args->back()->is_error_expression() |
5c13bd80 | 8682 | || args->back()->type()->is_error()) |
e440a328 | 8683 | this->set_is_error(); |
8684 | else if (!Type::are_identical(args->front()->type(), | |
07ba8be5 | 8685 | args->back()->type(), true, NULL)) |
48080209 | 8686 | this->report_error(_("complex arguments must have identical types")); |
e440a328 | 8687 | else if (args->front()->type()->float_type() == NULL) |
48080209 | 8688 | this->report_error(_("complex arguments must have " |
e440a328 | 8689 | "floating-point type")); |
8690 | } | |
8691 | break; | |
8692 | ||
8693 | default: | |
c3e6f413 | 8694 | go_unreachable(); |
e440a328 | 8695 | } |
8696 | } | |
8697 | ||
72666aed | 8698 | Expression* |
8699 | Builtin_call_expression::do_copy() | |
8700 | { | |
8701 | Call_expression* bce = | |
8702 | new Builtin_call_expression(this->gogo_, this->fn()->copy(), | |
da244e59 | 8703 | (this->args() == NULL |
8704 | ? NULL | |
8705 | : this->args()->copy()), | |
72666aed | 8706 | this->is_varargs(), |
8707 | this->location()); | |
8708 | ||
8709 | if (this->varargs_are_lowered()) | |
8710 | bce->set_varargs_are_lowered(); | |
8711 | return bce; | |
8712 | } | |
8713 | ||
ea664253 | 8714 | // Return the backend representation for a builtin function. |
e440a328 | 8715 | |
ea664253 | 8716 | Bexpression* |
8717 | Builtin_call_expression::do_get_backend(Translate_context* context) | |
e440a328 | 8718 | { |
8719 | Gogo* gogo = context->gogo(); | |
b13c66cd | 8720 | Location location = this->location(); |
a0d8874e | 8721 | |
8722 | if (this->is_erroneous_call()) | |
8723 | { | |
8724 | go_assert(saw_errors()); | |
8725 | return gogo->backend()->error_expression(); | |
8726 | } | |
8727 | ||
e440a328 | 8728 | switch (this->code_) |
8729 | { | |
8730 | case BUILTIN_INVALID: | |
8731 | case BUILTIN_NEW: | |
8732 | case BUILTIN_MAKE: | |
c3e6f413 | 8733 | go_unreachable(); |
e440a328 | 8734 | |
8735 | case BUILTIN_LEN: | |
8736 | case BUILTIN_CAP: | |
8737 | { | |
8738 | const Expression_list* args = this->args(); | |
c484d925 | 8739 | go_assert(args != NULL && args->size() == 1); |
2c809f8f | 8740 | Expression* arg = args->front(); |
e440a328 | 8741 | Type* arg_type = arg->type(); |
0f914071 | 8742 | |
8743 | if (this->seen_) | |
8744 | { | |
c484d925 | 8745 | go_assert(saw_errors()); |
ea664253 | 8746 | return context->backend()->error_expression(); |
0f914071 | 8747 | } |
8748 | this->seen_ = true; | |
0f914071 | 8749 | this->seen_ = false; |
e440a328 | 8750 | if (arg_type->points_to() != NULL) |
8751 | { | |
8752 | arg_type = arg_type->points_to(); | |
c484d925 | 8753 | go_assert(arg_type->array_type() != NULL |
411eb89e | 8754 | && !arg_type->is_slice_type()); |
2c809f8f | 8755 | arg = Expression::make_unary(OPERATOR_MULT, arg, location); |
e440a328 | 8756 | } |
8757 | ||
1b1f2abf | 8758 | Type* int_type = Type::lookup_integer_type("int"); |
2c809f8f | 8759 | Expression* val; |
e440a328 | 8760 | if (this->code_ == BUILTIN_LEN) |
8761 | { | |
8762 | if (arg_type->is_string_type()) | |
2c809f8f | 8763 | val = Expression::make_string_info(arg, STRING_INFO_LENGTH, |
8764 | location); | |
e440a328 | 8765 | else if (arg_type->array_type() != NULL) |
0f914071 | 8766 | { |
8767 | if (this->seen_) | |
8768 | { | |
c484d925 | 8769 | go_assert(saw_errors()); |
ea664253 | 8770 | return context->backend()->error_expression(); |
0f914071 | 8771 | } |
8772 | this->seen_ = true; | |
2c809f8f | 8773 | val = arg_type->array_type()->get_length(gogo, arg); |
0f914071 | 8774 | this->seen_ = false; |
8775 | } | |
0d5530d9 | 8776 | else if (arg_type->map_type() != NULL |
8777 | || arg_type->channel_type() != NULL) | |
8778 | { | |
8779 | // The first field is the length. If the pointer is | |
8780 | // nil, the length is zero. | |
8781 | Type* pint_type = Type::make_pointer_type(int_type); | |
8782 | arg = Expression::make_unsafe_cast(pint_type, arg, location); | |
8783 | Expression* nil = Expression::make_nil(location); | |
8784 | nil = Expression::make_cast(pint_type, nil, location); | |
8785 | Expression* cmp = Expression::make_binary(OPERATOR_EQEQ, | |
8786 | arg, nil, location); | |
8787 | Expression* zero = Expression::make_integer_ul(0, int_type, | |
8788 | location); | |
8789 | Expression* indir = Expression::make_unary(OPERATOR_MULT, | |
8790 | arg, location); | |
8791 | val = Expression::make_conditional(cmp, zero, indir, location); | |
8792 | } | |
e440a328 | 8793 | else |
c3e6f413 | 8794 | go_unreachable(); |
e440a328 | 8795 | } |
8796 | else | |
8797 | { | |
8798 | if (arg_type->array_type() != NULL) | |
0f914071 | 8799 | { |
8800 | if (this->seen_) | |
8801 | { | |
c484d925 | 8802 | go_assert(saw_errors()); |
ea664253 | 8803 | return context->backend()->error_expression(); |
0f914071 | 8804 | } |
8805 | this->seen_ = true; | |
2c809f8f | 8806 | val = arg_type->array_type()->get_capacity(gogo, arg); |
0f914071 | 8807 | this->seen_ = false; |
8808 | } | |
e440a328 | 8809 | else if (arg_type->channel_type() != NULL) |
132ed071 | 8810 | { |
8811 | // The second field is the capacity. If the pointer | |
8812 | // is nil, the capacity is zero. | |
8813 | Type* uintptr_type = Type::lookup_integer_type("uintptr"); | |
8814 | Type* pint_type = Type::make_pointer_type(int_type); | |
8815 | Expression* parg = Expression::make_unsafe_cast(uintptr_type, | |
8816 | arg, | |
8817 | location); | |
8818 | int off = int_type->integer_type()->bits() / 8; | |
8819 | Expression* eoff = Expression::make_integer_ul(off, | |
8820 | uintptr_type, | |
8821 | location); | |
8822 | parg = Expression::make_binary(OPERATOR_PLUS, parg, eoff, | |
8823 | location); | |
8824 | parg = Expression::make_unsafe_cast(pint_type, parg, location); | |
8825 | Expression* nil = Expression::make_nil(location); | |
8826 | nil = Expression::make_cast(pint_type, nil, location); | |
8827 | Expression* cmp = Expression::make_binary(OPERATOR_EQEQ, | |
8828 | arg, nil, location); | |
8829 | Expression* zero = Expression::make_integer_ul(0, int_type, | |
8830 | location); | |
8831 | Expression* indir = Expression::make_unary(OPERATOR_MULT, | |
8832 | parg, location); | |
8833 | val = Expression::make_conditional(cmp, zero, indir, location); | |
8834 | } | |
e440a328 | 8835 | else |
c3e6f413 | 8836 | go_unreachable(); |
e440a328 | 8837 | } |
8838 | ||
2c809f8f | 8839 | return Expression::make_cast(int_type, val, |
ea664253 | 8840 | location)->get_backend(context); |
e440a328 | 8841 | } |
8842 | ||
8843 | case BUILTIN_PRINT: | |
8844 | case BUILTIN_PRINTLN: | |
8845 | { | |
8846 | const bool is_ln = this->code_ == BUILTIN_PRINTLN; | |
88b03a70 | 8847 | |
8848 | Expression* print_stmts = Runtime::make_call(Runtime::PRINTLOCK, | |
8849 | location, 0); | |
e440a328 | 8850 | |
8851 | const Expression_list* call_args = this->args(); | |
8852 | if (call_args != NULL) | |
8853 | { | |
8854 | for (Expression_list::const_iterator p = call_args->begin(); | |
8855 | p != call_args->end(); | |
8856 | ++p) | |
8857 | { | |
8858 | if (is_ln && p != call_args->begin()) | |
8859 | { | |
2c809f8f | 8860 | Expression* print_space = |
88b03a70 | 8861 | Runtime::make_call(Runtime::PRINTSP, location, 0); |
e440a328 | 8862 | |
2c809f8f | 8863 | print_stmts = |
8864 | Expression::make_compound(print_stmts, print_space, | |
8865 | location); | |
8866 | } | |
e440a328 | 8867 | |
2c809f8f | 8868 | Expression* arg = *p; |
8869 | Type* type = arg->type(); | |
8870 | Runtime::Function code; | |
e440a328 | 8871 | if (type->is_string_type()) |
88b03a70 | 8872 | code = Runtime::PRINTSTRING; |
e440a328 | 8873 | else if (type->integer_type() != NULL |
8874 | && type->integer_type()->is_unsigned()) | |
8875 | { | |
e440a328 | 8876 | Type* itype = Type::lookup_integer_type("uint64"); |
2c809f8f | 8877 | arg = Expression::make_cast(itype, arg, location); |
88b03a70 | 8878 | code = Runtime::PRINTUINT; |
e440a328 | 8879 | } |
8880 | else if (type->integer_type() != NULL) | |
8881 | { | |
e440a328 | 8882 | Type* itype = Type::lookup_integer_type("int64"); |
2c809f8f | 8883 | arg = Expression::make_cast(itype, arg, location); |
88b03a70 | 8884 | code = Runtime::PRINTINT; |
e440a328 | 8885 | } |
8886 | else if (type->float_type() != NULL) | |
8887 | { | |
2c809f8f | 8888 | Type* dtype = Type::lookup_float_type("float64"); |
8889 | arg = Expression::make_cast(dtype, arg, location); | |
88b03a70 | 8890 | code = Runtime::PRINTFLOAT; |
e440a328 | 8891 | } |
8892 | else if (type->complex_type() != NULL) | |
8893 | { | |
2c809f8f | 8894 | Type* ctype = Type::lookup_complex_type("complex128"); |
8895 | arg = Expression::make_cast(ctype, arg, location); | |
88b03a70 | 8896 | code = Runtime::PRINTCOMPLEX; |
e440a328 | 8897 | } |
8898 | else if (type->is_boolean_type()) | |
88b03a70 | 8899 | code = Runtime::PRINTBOOL; |
e440a328 | 8900 | else if (type->points_to() != NULL |
8901 | || type->channel_type() != NULL | |
8902 | || type->map_type() != NULL | |
8903 | || type->function_type() != NULL) | |
8904 | { | |
2c809f8f | 8905 | arg = Expression::make_cast(type, arg, location); |
88b03a70 | 8906 | code = Runtime::PRINTPOINTER; |
e440a328 | 8907 | } |
8908 | else if (type->interface_type() != NULL) | |
8909 | { | |
8910 | if (type->interface_type()->is_empty()) | |
88b03a70 | 8911 | code = Runtime::PRINTEFACE; |
e440a328 | 8912 | else |
88b03a70 | 8913 | code = Runtime::PRINTIFACE; |
e440a328 | 8914 | } |
411eb89e | 8915 | else if (type->is_slice_type()) |
88b03a70 | 8916 | code = Runtime::PRINTSLICE; |
e440a328 | 8917 | else |
cd238b8d | 8918 | { |
8919 | go_assert(saw_errors()); | |
ea664253 | 8920 | return context->backend()->error_expression(); |
cd238b8d | 8921 | } |
e440a328 | 8922 | |
2c809f8f | 8923 | Expression* call = Runtime::make_call(code, location, 1, arg); |
88b03a70 | 8924 | print_stmts = Expression::make_compound(print_stmts, call, |
8925 | location); | |
e440a328 | 8926 | } |
8927 | } | |
8928 | ||
8929 | if (is_ln) | |
8930 | { | |
2c809f8f | 8931 | Expression* print_nl = |
88b03a70 | 8932 | Runtime::make_call(Runtime::PRINTNL, location, 0); |
8933 | print_stmts = Expression::make_compound(print_stmts, print_nl, | |
8934 | location); | |
e440a328 | 8935 | } |
8936 | ||
88b03a70 | 8937 | Expression* unlock = Runtime::make_call(Runtime::PRINTUNLOCK, |
8938 | location, 0); | |
8939 | print_stmts = Expression::make_compound(print_stmts, unlock, location); | |
32e3ff69 | 8940 | |
ea664253 | 8941 | return print_stmts->get_backend(context); |
e440a328 | 8942 | } |
8943 | ||
8944 | case BUILTIN_PANIC: | |
8945 | { | |
8946 | const Expression_list* args = this->args(); | |
c484d925 | 8947 | go_assert(args != NULL && args->size() == 1); |
e440a328 | 8948 | Expression* arg = args->front(); |
b13c66cd | 8949 | Type *empty = |
823c7e3d | 8950 | Type::make_empty_interface_type(Linemap::predeclared_location()); |
2c809f8f | 8951 | arg = Expression::convert_for_assignment(gogo, empty, arg, location); |
8952 | ||
8953 | Expression* panic = | |
8954 | Runtime::make_call(Runtime::PANIC, location, 1, arg); | |
ea664253 | 8955 | return panic->get_backend(context); |
e440a328 | 8956 | } |
8957 | ||
8958 | case BUILTIN_RECOVER: | |
8959 | { | |
8960 | // The argument is set when building recover thunks. It's a | |
8961 | // boolean value which is true if we can recover a value now. | |
8962 | const Expression_list* args = this->args(); | |
c484d925 | 8963 | go_assert(args != NULL && args->size() == 1); |
e440a328 | 8964 | Expression* arg = args->front(); |
b13c66cd | 8965 | Type *empty = |
823c7e3d | 8966 | Type::make_empty_interface_type(Linemap::predeclared_location()); |
e440a328 | 8967 | |
e440a328 | 8968 | Expression* nil = Expression::make_nil(location); |
2c809f8f | 8969 | nil = Expression::convert_for_assignment(gogo, empty, nil, location); |
e440a328 | 8970 | |
8971 | // We need to handle a deferred call to recover specially, | |
8972 | // because it changes whether it can recover a panic or not. | |
8973 | // See test7 in test/recover1.go. | |
2c809f8f | 8974 | Expression* recover = Runtime::make_call((this->is_deferred() |
8975 | ? Runtime::DEFERRED_RECOVER | |
8976 | : Runtime::RECOVER), | |
8977 | location, 0); | |
8978 | Expression* cond = | |
8979 | Expression::make_conditional(arg, recover, nil, location); | |
ea664253 | 8980 | return cond->get_backend(context); |
e440a328 | 8981 | } |
8982 | ||
8983 | case BUILTIN_CLOSE: | |
e440a328 | 8984 | { |
8985 | const Expression_list* args = this->args(); | |
c484d925 | 8986 | go_assert(args != NULL && args->size() == 1); |
e440a328 | 8987 | Expression* arg = args->front(); |
2c809f8f | 8988 | Expression* close = Runtime::make_call(Runtime::CLOSE, location, |
8989 | 1, arg); | |
ea664253 | 8990 | return close->get_backend(context); |
e440a328 | 8991 | } |
8992 | ||
8993 | case BUILTIN_SIZEOF: | |
8994 | case BUILTIN_OFFSETOF: | |
8995 | case BUILTIN_ALIGNOF: | |
8996 | { | |
0c77715b | 8997 | Numeric_constant nc; |
8998 | unsigned long val; | |
8999 | if (!this->numeric_constant_value(&nc) | |
9000 | || nc.to_unsigned_long(&val) != Numeric_constant::NC_UL_VALID) | |
7f1d9abd | 9001 | { |
c484d925 | 9002 | go_assert(saw_errors()); |
ea664253 | 9003 | return context->backend()->error_expression(); |
7f1d9abd | 9004 | } |
7ba86326 | 9005 | Type* uintptr_type = Type::lookup_integer_type("uintptr"); |
2c809f8f | 9006 | mpz_t ival; |
9007 | nc.get_int(&ival); | |
9008 | Expression* int_cst = | |
e67508fa | 9009 | Expression::make_integer_z(&ival, uintptr_type, location); |
2c809f8f | 9010 | mpz_clear(ival); |
ea664253 | 9011 | return int_cst->get_backend(context); |
e440a328 | 9012 | } |
9013 | ||
9014 | case BUILTIN_COPY: | |
9015 | { | |
9016 | const Expression_list* args = this->args(); | |
c484d925 | 9017 | go_assert(args != NULL && args->size() == 2); |
e440a328 | 9018 | Expression* arg1 = args->front(); |
9019 | Expression* arg2 = args->back(); | |
9020 | ||
e440a328 | 9021 | Type* arg1_type = arg1->type(); |
9022 | Array_type* at = arg1_type->array_type(); | |
35a54f17 | 9023 | go_assert(arg1->is_variable()); |
321e5ad2 | 9024 | |
9025 | Expression* call; | |
e440a328 | 9026 | |
9027 | Type* arg2_type = arg2->type(); | |
2c809f8f | 9028 | go_assert(arg2->is_variable()); |
321e5ad2 | 9029 | if (arg2_type->is_string_type()) |
9030 | call = Runtime::make_call(Runtime::SLICESTRINGCOPY, location, | |
9031 | 2, arg1, arg2); | |
e440a328 | 9032 | else |
9033 | { | |
321e5ad2 | 9034 | Type* et = at->element_type(); |
9035 | if (et->has_pointer()) | |
9036 | { | |
9037 | Expression* td = Expression::make_type_descriptor(et, | |
9038 | location); | |
9039 | call = Runtime::make_call(Runtime::TYPEDSLICECOPY, location, | |
9040 | 3, td, arg1, arg2); | |
9041 | } | |
9042 | else | |
9043 | { | |
9044 | Expression* sz = Expression::make_type_info(et, | |
9045 | TYPE_INFO_SIZE); | |
9046 | call = Runtime::make_call(Runtime::SLICECOPY, location, 3, | |
9047 | arg1, arg2, sz); | |
9048 | } | |
e440a328 | 9049 | } |
2c809f8f | 9050 | |
321e5ad2 | 9051 | return call->get_backend(context); |
e440a328 | 9052 | } |
9053 | ||
9054 | case BUILTIN_APPEND: | |
321e5ad2 | 9055 | // Handled in Builtin_call_expression::flatten_append. |
9056 | go_unreachable(); | |
e440a328 | 9057 | |
9058 | case BUILTIN_REAL: | |
9059 | case BUILTIN_IMAG: | |
9060 | { | |
9061 | const Expression_list* args = this->args(); | |
c484d925 | 9062 | go_assert(args != NULL && args->size() == 1); |
2c809f8f | 9063 | |
9064 | Bexpression* ret; | |
ea664253 | 9065 | Bexpression* bcomplex = args->front()->get_backend(context); |
2c809f8f | 9066 | if (this->code_ == BUILTIN_REAL) |
9067 | ret = gogo->backend()->real_part_expression(bcomplex, location); | |
9068 | else | |
9069 | ret = gogo->backend()->imag_part_expression(bcomplex, location); | |
ea664253 | 9070 | return ret; |
e440a328 | 9071 | } |
9072 | ||
48080209 | 9073 | case BUILTIN_COMPLEX: |
e440a328 | 9074 | { |
9075 | const Expression_list* args = this->args(); | |
c484d925 | 9076 | go_assert(args != NULL && args->size() == 2); |
ea664253 | 9077 | Bexpression* breal = args->front()->get_backend(context); |
9078 | Bexpression* bimag = args->back()->get_backend(context); | |
9079 | return gogo->backend()->complex_expression(breal, bimag, location); | |
e440a328 | 9080 | } |
9081 | ||
9082 | default: | |
c3e6f413 | 9083 | go_unreachable(); |
e440a328 | 9084 | } |
9085 | } | |
9086 | ||
9087 | // We have to support exporting a builtin call expression, because | |
9088 | // code can set a constant to the result of a builtin expression. | |
9089 | ||
9090 | void | |
9091 | Builtin_call_expression::do_export(Export* exp) const | |
9092 | { | |
0c77715b | 9093 | Numeric_constant nc; |
9094 | if (!this->numeric_constant_value(&nc)) | |
9095 | { | |
631d5788 | 9096 | go_error_at(this->location(), "value is not constant"); |
0c77715b | 9097 | return; |
9098 | } | |
e440a328 | 9099 | |
0c77715b | 9100 | if (nc.is_int()) |
e440a328 | 9101 | { |
0c77715b | 9102 | mpz_t val; |
9103 | nc.get_int(&val); | |
e440a328 | 9104 | Integer_expression::export_integer(exp, val); |
0c77715b | 9105 | mpz_clear(val); |
e440a328 | 9106 | } |
0c77715b | 9107 | else if (nc.is_float()) |
e440a328 | 9108 | { |
9109 | mpfr_t fval; | |
0c77715b | 9110 | nc.get_float(&fval); |
9111 | Float_expression::export_float(exp, fval); | |
e440a328 | 9112 | mpfr_clear(fval); |
9113 | } | |
0c77715b | 9114 | else if (nc.is_complex()) |
e440a328 | 9115 | { |
fcbea5e4 | 9116 | mpc_t cval; |
9117 | nc.get_complex(&cval); | |
9118 | Complex_expression::export_complex(exp, cval); | |
9119 | mpc_clear(cval); | |
e440a328 | 9120 | } |
0c77715b | 9121 | else |
9122 | go_unreachable(); | |
e440a328 | 9123 | |
9124 | // A trailing space lets us reliably identify the end of the number. | |
9125 | exp->write_c_string(" "); | |
9126 | } | |
9127 | ||
9128 | // Class Call_expression. | |
9129 | ||
8381eda7 | 9130 | // A Go function can be viewed in a couple of different ways. The |
9131 | // code of a Go function becomes a backend function with parameters | |
9132 | // whose types are simply the backend representation of the Go types. | |
9133 | // If there are multiple results, they are returned as a backend | |
9134 | // struct. | |
9135 | ||
9136 | // However, when Go code refers to a function other than simply | |
9137 | // calling it, the backend type of that function is actually a struct. | |
9138 | // The first field of the struct points to the Go function code | |
9139 | // (sometimes a wrapper as described below). The remaining fields | |
9140 | // hold addresses of closed-over variables. This struct is called a | |
9141 | // closure. | |
9142 | ||
9143 | // There are a few cases to consider. | |
9144 | ||
9145 | // A direct function call of a known function in package scope. In | |
9146 | // this case there are no closed-over variables, and we know the name | |
9147 | // of the function code. We can simply produce a backend call to the | |
9148 | // function directly, and not worry about the closure. | |
9149 | ||
9150 | // A direct function call of a known function literal. In this case | |
9151 | // we know the function code and we know the closure. We generate the | |
9152 | // function code such that it expects an additional final argument of | |
9153 | // the closure type. We pass the closure as the last argument, after | |
9154 | // the other arguments. | |
9155 | ||
9156 | // An indirect function call. In this case we have a closure. We | |
9157 | // load the pointer to the function code from the first field of the | |
9158 | // closure. We pass the address of the closure as the last argument. | |
9159 | ||
9160 | // A call to a method of an interface. Type methods are always at | |
9161 | // package scope, so we call the function directly, and don't worry | |
9162 | // about the closure. | |
9163 | ||
9164 | // This means that for a function at package scope we have two cases. | |
9165 | // One is the direct call, which has no closure. The other is the | |
9166 | // indirect call, which does have a closure. We can't simply ignore | |
9167 | // the closure, even though it is the last argument, because that will | |
9168 | // fail on targets where the function pops its arguments. So when | |
9169 | // generating a closure for a package-scope function we set the | |
9170 | // function code pointer in the closure to point to a wrapper | |
9171 | // function. This wrapper function accepts a final argument that | |
9172 | // points to the closure, ignores it, and calls the real function as a | |
9173 | // direct function call. This wrapper will normally be efficient, and | |
9174 | // can often simply be a tail call to the real function. | |
9175 | ||
9176 | // We don't use GCC's static chain pointer because 1) we don't need | |
9177 | // it; 2) GCC only permits using a static chain to call a known | |
9178 | // function, so we can't use it for an indirect call anyhow. Since we | |
9179 | // can't use it for an indirect call, we may as well not worry about | |
9180 | // using it for a direct call either. | |
9181 | ||
9182 | // We pass the closure last rather than first because it means that | |
9183 | // the function wrapper we put into a closure for a package-scope | |
9184 | // function can normally just be a tail call to the real function. | |
9185 | ||
9186 | // For method expressions we generate a wrapper that loads the | |
9187 | // receiver from the closure and then calls the method. This | |
9188 | // unfortunately forces reshuffling the arguments, since there is a | |
9189 | // new first argument, but we can't avoid reshuffling either for | |
9190 | // method expressions or for indirect calls of package-scope | |
9191 | // functions, and since the latter are more common we reshuffle for | |
9192 | // method expressions. | |
9193 | ||
9194 | // Note that the Go code retains the Go types. The extra final | |
9195 | // argument only appears when we convert to the backend | |
9196 | // representation. | |
9197 | ||
e440a328 | 9198 | // Traversal. |
9199 | ||
9200 | int | |
9201 | Call_expression::do_traverse(Traverse* traverse) | |
9202 | { | |
0c0dacab | 9203 | // If we are calling a function in a different package that returns |
9204 | // an unnamed type, this may be the only chance we get to traverse | |
9205 | // that type. We don't traverse this->type_ because it may be a | |
9206 | // Call_multiple_result_type that will just lead back here. | |
9207 | if (this->type_ != NULL && !this->type_->is_error_type()) | |
9208 | { | |
9209 | Function_type *fntype = this->get_function_type(); | |
9210 | if (fntype != NULL && Type::traverse(fntype, traverse) == TRAVERSE_EXIT) | |
9211 | return TRAVERSE_EXIT; | |
9212 | } | |
e440a328 | 9213 | if (Expression::traverse(&this->fn_, traverse) == TRAVERSE_EXIT) |
9214 | return TRAVERSE_EXIT; | |
9215 | if (this->args_ != NULL) | |
9216 | { | |
9217 | if (this->args_->traverse(traverse) == TRAVERSE_EXIT) | |
9218 | return TRAVERSE_EXIT; | |
9219 | } | |
9220 | return TRAVERSE_CONTINUE; | |
9221 | } | |
9222 | ||
9223 | // Lower a call statement. | |
9224 | ||
9225 | Expression* | |
ceeb4318 | 9226 | Call_expression::do_lower(Gogo* gogo, Named_object* function, |
9227 | Statement_inserter* inserter, int) | |
e440a328 | 9228 | { |
b13c66cd | 9229 | Location loc = this->location(); |
09ea332d | 9230 | |
ceeb4318 | 9231 | // A type cast can look like a function call. |
e440a328 | 9232 | if (this->fn_->is_type_expression() |
9233 | && this->args_ != NULL | |
9234 | && this->args_->size() == 1) | |
9235 | return Expression::make_cast(this->fn_->type(), this->args_->front(), | |
09ea332d | 9236 | loc); |
e440a328 | 9237 | |
88f06749 | 9238 | // Because do_type will return an error type and thus prevent future |
9239 | // errors, check for that case now to ensure that the error gets | |
9240 | // reported. | |
37448b10 | 9241 | Function_type* fntype = this->get_function_type(); |
9242 | if (fntype == NULL) | |
88f06749 | 9243 | { |
9244 | if (!this->fn_->type()->is_error()) | |
9245 | this->report_error(_("expected function")); | |
5f1045b5 | 9246 | this->set_is_error(); |
9247 | return this; | |
88f06749 | 9248 | } |
9249 | ||
e440a328 | 9250 | // Handle an argument which is a call to a function which returns |
9251 | // multiple results. | |
9252 | if (this->args_ != NULL | |
9253 | && this->args_->size() == 1 | |
37448b10 | 9254 | && this->args_->front()->call_expression() != NULL) |
e440a328 | 9255 | { |
e440a328 | 9256 | size_t rc = this->args_->front()->call_expression()->result_count(); |
9257 | if (rc > 1 | |
37448b10 | 9258 | && ((fntype->parameters() != NULL |
9259 | && (fntype->parameters()->size() == rc | |
9260 | || (fntype->is_varargs() | |
9261 | && fntype->parameters()->size() - 1 <= rc))) | |
9262 | || fntype->is_builtin())) | |
e440a328 | 9263 | { |
9264 | Call_expression* call = this->args_->front()->call_expression(); | |
e90ecd2d | 9265 | call->set_is_multi_value_arg(); |
c33af8e4 | 9266 | if (this->is_varargs_) |
9267 | { | |
9268 | // It is not clear which result of a multiple result call | |
9269 | // the ellipsis operator should be applied to. If we unpack the | |
9270 | // the call into its individual results here, the ellipsis will be | |
9271 | // applied to the last result. | |
631d5788 | 9272 | go_error_at(call->location(), |
9273 | _("multiple-value argument in single-value context")); | |
c33af8e4 | 9274 | return Expression::make_error(call->location()); |
9275 | } | |
9276 | ||
e440a328 | 9277 | Expression_list* args = new Expression_list; |
9278 | for (size_t i = 0; i < rc; ++i) | |
9279 | args->push_back(Expression::make_call_result(call, i)); | |
9280 | // We can't return a new call expression here, because this | |
42535814 | 9281 | // one may be referenced by Call_result expressions. We |
9282 | // also can't delete the old arguments, because we may still | |
9283 | // traverse them somewhere up the call stack. FIXME. | |
e440a328 | 9284 | this->args_ = args; |
9285 | } | |
9286 | } | |
9287 | ||
37448b10 | 9288 | // Recognize a call to a builtin function. |
9289 | if (fntype->is_builtin()) | |
9290 | return new Builtin_call_expression(gogo, this->fn_, this->args_, | |
9291 | this->is_varargs_, loc); | |
9292 | ||
ceeb4318 | 9293 | // If this call returns multiple results, create a temporary |
9294 | // variable for each result. | |
9295 | size_t rc = this->result_count(); | |
9296 | if (rc > 1 && this->results_ == NULL) | |
9297 | { | |
9298 | std::vector<Temporary_statement*>* temps = | |
9299 | new std::vector<Temporary_statement*>; | |
9300 | temps->reserve(rc); | |
37448b10 | 9301 | const Typed_identifier_list* results = fntype->results(); |
ceeb4318 | 9302 | for (Typed_identifier_list::const_iterator p = results->begin(); |
9303 | p != results->end(); | |
9304 | ++p) | |
9305 | { | |
9306 | Temporary_statement* temp = Statement::make_temporary(p->type(), | |
09ea332d | 9307 | NULL, loc); |
ceeb4318 | 9308 | inserter->insert(temp); |
9309 | temps->push_back(temp); | |
9310 | } | |
9311 | this->results_ = temps; | |
9312 | } | |
9313 | ||
e440a328 | 9314 | // Handle a call to a varargs function by packaging up the extra |
9315 | // parameters. | |
37448b10 | 9316 | if (fntype->is_varargs()) |
e440a328 | 9317 | { |
e440a328 | 9318 | const Typed_identifier_list* parameters = fntype->parameters(); |
c484d925 | 9319 | go_assert(parameters != NULL && !parameters->empty()); |
e440a328 | 9320 | Type* varargs_type = parameters->back().type(); |
09ea332d | 9321 | this->lower_varargs(gogo, function, inserter, varargs_type, |
0e9a2e72 | 9322 | parameters->size(), SLICE_STORAGE_MAY_ESCAPE); |
09ea332d | 9323 | } |
9324 | ||
9325 | // If this is call to a method, call the method directly passing the | |
9326 | // object as the first parameter. | |
9327 | Bound_method_expression* bme = this->fn_->bound_method_expression(); | |
9328 | if (bme != NULL) | |
9329 | { | |
0afbb937 | 9330 | Named_object* methodfn = bme->function(); |
09ea332d | 9331 | Expression* first_arg = bme->first_argument(); |
9332 | ||
9333 | // We always pass a pointer when calling a method. | |
9334 | if (first_arg->type()->points_to() == NULL | |
9335 | && !first_arg->type()->is_error()) | |
9336 | { | |
9337 | first_arg = Expression::make_unary(OPERATOR_AND, first_arg, loc); | |
9338 | // We may need to create a temporary variable so that we can | |
9339 | // take the address. We can't do that here because it will | |
9340 | // mess up the order of evaluation. | |
9341 | Unary_expression* ue = static_cast<Unary_expression*>(first_arg); | |
9342 | ue->set_create_temp(); | |
9343 | } | |
9344 | ||
9345 | // If we are calling a method which was inherited from an | |
9346 | // embedded struct, and the method did not get a stub, then the | |
9347 | // first type may be wrong. | |
9348 | Type* fatype = bme->first_argument_type(); | |
9349 | if (fatype != NULL) | |
9350 | { | |
9351 | if (fatype->points_to() == NULL) | |
9352 | fatype = Type::make_pointer_type(fatype); | |
9353 | first_arg = Expression::make_unsafe_cast(fatype, first_arg, loc); | |
9354 | } | |
9355 | ||
9356 | Expression_list* new_args = new Expression_list(); | |
9357 | new_args->push_back(first_arg); | |
9358 | if (this->args_ != NULL) | |
9359 | { | |
9360 | for (Expression_list::const_iterator p = this->args_->begin(); | |
9361 | p != this->args_->end(); | |
9362 | ++p) | |
9363 | new_args->push_back(*p); | |
9364 | } | |
9365 | ||
9366 | // We have to change in place because this structure may be | |
9367 | // referenced by Call_result_expressions. We can't delete the | |
9368 | // old arguments, because we may be traversing them up in some | |
9369 | // caller. FIXME. | |
9370 | this->args_ = new_args; | |
0afbb937 | 9371 | this->fn_ = Expression::make_func_reference(methodfn, NULL, |
09ea332d | 9372 | bme->location()); |
e440a328 | 9373 | } |
9374 | ||
105f9a24 | 9375 | // Handle a couple of special runtime functions. In the runtime |
9376 | // package, getcallerpc returns the PC of the caller, and | |
9377 | // getcallersp returns the frame pointer of the caller. Implement | |
9378 | // these by turning them into calls to GCC builtin functions. We | |
9379 | // could implement them in normal code, but then we would have to | |
9380 | // explicitly unwind the stack. These functions are intended to be | |
9381 | // efficient. Note that this technique obviously only works for | |
9382 | // direct calls, but that is the only way they are used. The actual | |
9383 | // argument to these functions is always the address of a parameter; | |
9384 | // we don't need that for the GCC builtin functions, so we just | |
9385 | // ignore it. | |
9386 | if (gogo->compiling_runtime() | |
9387 | && this->args_ != NULL | |
9388 | && this->args_->size() == 1 | |
9389 | && gogo->package_name() == "runtime") | |
9390 | { | |
9391 | Func_expression* fe = this->fn_->func_expression(); | |
9392 | if (fe != NULL | |
9393 | && fe->named_object()->is_function_declaration() | |
9394 | && fe->named_object()->package() == NULL) | |
9395 | { | |
9396 | std::string n = Gogo::unpack_hidden_name(fe->named_object()->name()); | |
9397 | if (n == "getcallerpc") | |
9398 | { | |
9399 | static Named_object* builtin_return_address; | |
9400 | return this->lower_to_builtin(&builtin_return_address, | |
9401 | "__builtin_return_address", | |
9402 | 0); | |
9403 | } | |
9404 | else if (n == "getcallersp") | |
9405 | { | |
9406 | static Named_object* builtin_frame_address; | |
9407 | return this->lower_to_builtin(&builtin_frame_address, | |
9408 | "__builtin_frame_address", | |
9409 | 1); | |
9410 | } | |
9411 | } | |
9412 | } | |
9413 | ||
e440a328 | 9414 | return this; |
9415 | } | |
9416 | ||
9417 | // Lower a call to a varargs function. FUNCTION is the function in | |
9418 | // which the call occurs--it's not the function we are calling. | |
9419 | // VARARGS_TYPE is the type of the varargs parameter, a slice type. | |
9420 | // PARAM_COUNT is the number of parameters of the function we are | |
9421 | // calling; the last of these parameters will be the varargs | |
9422 | // parameter. | |
9423 | ||
09ea332d | 9424 | void |
e440a328 | 9425 | Call_expression::lower_varargs(Gogo* gogo, Named_object* function, |
ceeb4318 | 9426 | Statement_inserter* inserter, |
0e9a2e72 | 9427 | Type* varargs_type, size_t param_count, |
9428 | Slice_storage_escape_disp escape_disp) | |
e440a328 | 9429 | { |
9430 | if (this->varargs_are_lowered_) | |
09ea332d | 9431 | return; |
e440a328 | 9432 | |
b13c66cd | 9433 | Location loc = this->location(); |
e440a328 | 9434 | |
c484d925 | 9435 | go_assert(param_count > 0); |
411eb89e | 9436 | go_assert(varargs_type->is_slice_type()); |
e440a328 | 9437 | |
9438 | size_t arg_count = this->args_ == NULL ? 0 : this->args_->size(); | |
9439 | if (arg_count < param_count - 1) | |
9440 | { | |
9441 | // Not enough arguments; will be caught in check_types. | |
09ea332d | 9442 | return; |
e440a328 | 9443 | } |
9444 | ||
9445 | Expression_list* old_args = this->args_; | |
9446 | Expression_list* new_args = new Expression_list(); | |
9447 | bool push_empty_arg = false; | |
9448 | if (old_args == NULL || old_args->empty()) | |
9449 | { | |
c484d925 | 9450 | go_assert(param_count == 1); |
e440a328 | 9451 | push_empty_arg = true; |
9452 | } | |
9453 | else | |
9454 | { | |
9455 | Expression_list::const_iterator pa; | |
9456 | int i = 1; | |
9457 | for (pa = old_args->begin(); pa != old_args->end(); ++pa, ++i) | |
9458 | { | |
9459 | if (static_cast<size_t>(i) == param_count) | |
9460 | break; | |
9461 | new_args->push_back(*pa); | |
9462 | } | |
9463 | ||
9464 | // We have reached the varargs parameter. | |
9465 | ||
9466 | bool issued_error = false; | |
9467 | if (pa == old_args->end()) | |
9468 | push_empty_arg = true; | |
9469 | else if (pa + 1 == old_args->end() && this->is_varargs_) | |
9470 | new_args->push_back(*pa); | |
9471 | else if (this->is_varargs_) | |
9472 | { | |
a6645f74 | 9473 | if ((*pa)->type()->is_slice_type()) |
9474 | this->report_error(_("too many arguments")); | |
9475 | else | |
9476 | { | |
631d5788 | 9477 | go_error_at(this->location(), |
9478 | _("invalid use of %<...%> with non-slice")); | |
a6645f74 | 9479 | this->set_is_error(); |
9480 | } | |
09ea332d | 9481 | return; |
e440a328 | 9482 | } |
e440a328 | 9483 | else |
9484 | { | |
9485 | Type* element_type = varargs_type->array_type()->element_type(); | |
9486 | Expression_list* vals = new Expression_list; | |
9487 | for (; pa != old_args->end(); ++pa, ++i) | |
9488 | { | |
9489 | // Check types here so that we get a better message. | |
9490 | Type* patype = (*pa)->type(); | |
b13c66cd | 9491 | Location paloc = (*pa)->location(); |
e440a328 | 9492 | if (!this->check_argument_type(i, element_type, patype, |
9493 | paloc, issued_error)) | |
9494 | continue; | |
9495 | vals->push_back(*pa); | |
9496 | } | |
0e9a2e72 | 9497 | Slice_construction_expression* sce = |
e440a328 | 9498 | Expression::make_slice_composite_literal(varargs_type, vals, loc); |
0e9a2e72 | 9499 | if (escape_disp == SLICE_STORAGE_DOES_NOT_ESCAPE) |
9500 | sce->set_storage_does_not_escape(); | |
9501 | Expression* val = sce; | |
09ea332d | 9502 | gogo->lower_expression(function, inserter, &val); |
e440a328 | 9503 | new_args->push_back(val); |
9504 | } | |
9505 | } | |
9506 | ||
9507 | if (push_empty_arg) | |
9508 | new_args->push_back(Expression::make_nil(loc)); | |
9509 | ||
9510 | // We can't return a new call expression here, because this one may | |
6d4c2432 | 9511 | // be referenced by Call_result expressions. FIXME. We can't |
9512 | // delete OLD_ARGS because we may have both a Call_expression and a | |
9513 | // Builtin_call_expression which refer to them. FIXME. | |
e440a328 | 9514 | this->args_ = new_args; |
9515 | this->varargs_are_lowered_ = true; | |
e440a328 | 9516 | } |
9517 | ||
105f9a24 | 9518 | // Return a call to __builtin_return_address or __builtin_frame_address. |
9519 | ||
9520 | Expression* | |
9521 | Call_expression::lower_to_builtin(Named_object** pno, const char* name, | |
9522 | int arg) | |
9523 | { | |
9524 | if (*pno == NULL) | |
9525 | *pno = Gogo::declare_builtin_rf_address(name); | |
9526 | ||
9527 | Location loc = this->location(); | |
9528 | ||
9529 | Expression* fn = Expression::make_func_reference(*pno, NULL, loc); | |
9530 | Expression* a = Expression::make_integer_ul(arg, NULL, loc); | |
9531 | Expression_list *args = new Expression_list(); | |
9532 | args->push_back(a); | |
9533 | Expression* call = Expression::make_call(fn, args, false, loc); | |
9534 | ||
9535 | // The builtin functions return void*, but the Go functions return uintptr. | |
9536 | Type* uintptr_type = Type::lookup_integer_type("uintptr"); | |
9537 | return Expression::make_cast(uintptr_type, call, loc); | |
9538 | } | |
9539 | ||
2c809f8f | 9540 | // Flatten a call with multiple results into a temporary. |
9541 | ||
9542 | Expression* | |
b8e86a51 | 9543 | Call_expression::do_flatten(Gogo* gogo, Named_object*, |
9544 | Statement_inserter* inserter) | |
2c809f8f | 9545 | { |
5bf8be8b | 9546 | if (this->is_erroneous_call()) |
9547 | { | |
9548 | go_assert(saw_errors()); | |
9549 | return Expression::make_error(this->location()); | |
9550 | } | |
b8e86a51 | 9551 | |
91c0fd76 | 9552 | if (this->is_flattened_) |
9553 | return this; | |
9554 | this->is_flattened_ = true; | |
9555 | ||
b8e86a51 | 9556 | // Add temporary variables for all arguments that require type |
9557 | // conversion. | |
9558 | Function_type* fntype = this->get_function_type(); | |
9782d556 | 9559 | if (fntype == NULL) |
9560 | { | |
9561 | go_assert(saw_errors()); | |
9562 | return this; | |
9563 | } | |
b8e86a51 | 9564 | if (this->args_ != NULL && !this->args_->empty() |
9565 | && fntype->parameters() != NULL && !fntype->parameters()->empty()) | |
9566 | { | |
9567 | bool is_interface_method = | |
9568 | this->fn_->interface_field_reference_expression() != NULL; | |
9569 | ||
9570 | Expression_list *args = new Expression_list(); | |
9571 | Typed_identifier_list::const_iterator pp = fntype->parameters()->begin(); | |
9572 | Expression_list::const_iterator pa = this->args_->begin(); | |
9573 | if (!is_interface_method && fntype->is_method()) | |
9574 | { | |
9575 | // The receiver argument. | |
9576 | args->push_back(*pa); | |
9577 | ++pa; | |
9578 | } | |
9579 | for (; pa != this->args_->end(); ++pa, ++pp) | |
9580 | { | |
9581 | go_assert(pp != fntype->parameters()->end()); | |
9582 | if (Type::are_identical(pp->type(), (*pa)->type(), true, NULL)) | |
9583 | args->push_back(*pa); | |
9584 | else | |
9585 | { | |
9586 | Location loc = (*pa)->location(); | |
8ba8cc87 | 9587 | Expression* arg = *pa; |
9588 | if (!arg->is_variable()) | |
9589 | { | |
9590 | Temporary_statement *temp = | |
9591 | Statement::make_temporary(NULL, arg, loc); | |
9592 | inserter->insert(temp); | |
9593 | arg = Expression::make_temporary_reference(temp, loc); | |
9594 | } | |
9595 | arg = Expression::convert_for_assignment(gogo, pp->type(), arg, | |
9596 | loc); | |
9597 | args->push_back(arg); | |
b8e86a51 | 9598 | } |
9599 | } | |
9600 | delete this->args_; | |
9601 | this->args_ = args; | |
9602 | } | |
9603 | ||
2c809f8f | 9604 | size_t rc = this->result_count(); |
9605 | if (rc > 1 && this->call_temp_ == NULL) | |
9606 | { | |
9607 | Struct_field_list* sfl = new Struct_field_list(); | |
9608 | Function_type* fntype = this->get_function_type(); | |
9609 | const Typed_identifier_list* results = fntype->results(); | |
9610 | Location loc = this->location(); | |
9611 | ||
9612 | int i = 0; | |
61575e0f | 9613 | char buf[20]; |
2c809f8f | 9614 | for (Typed_identifier_list::const_iterator p = results->begin(); |
9615 | p != results->end(); | |
9616 | ++p, ++i) | |
9617 | { | |
9618 | snprintf(buf, sizeof buf, "res%d", i); | |
9619 | sfl->push_back(Struct_field(Typed_identifier(buf, p->type(), loc))); | |
9620 | } | |
9621 | ||
9622 | Struct_type* st = Type::make_struct_type(sfl, loc); | |
9623 | this->call_temp_ = Statement::make_temporary(st, NULL, loc); | |
9624 | inserter->insert(this->call_temp_); | |
9625 | } | |
9626 | ||
9627 | return this; | |
9628 | } | |
9629 | ||
ceeb4318 | 9630 | // Get the function type. This can return NULL in error cases. |
e440a328 | 9631 | |
9632 | Function_type* | |
9633 | Call_expression::get_function_type() const | |
9634 | { | |
9635 | return this->fn_->type()->function_type(); | |
9636 | } | |
9637 | ||
9638 | // Return the number of values which this call will return. | |
9639 | ||
9640 | size_t | |
9641 | Call_expression::result_count() const | |
9642 | { | |
9643 | const Function_type* fntype = this->get_function_type(); | |
9644 | if (fntype == NULL) | |
9645 | return 0; | |
9646 | if (fntype->results() == NULL) | |
9647 | return 0; | |
9648 | return fntype->results()->size(); | |
9649 | } | |
9650 | ||
ceeb4318 | 9651 | // Return the temporary which holds a result. |
9652 | ||
9653 | Temporary_statement* | |
9654 | Call_expression::result(size_t i) const | |
9655 | { | |
cd238b8d | 9656 | if (this->results_ == NULL || this->results_->size() <= i) |
9657 | { | |
9658 | go_assert(saw_errors()); | |
9659 | return NULL; | |
9660 | } | |
ceeb4318 | 9661 | return (*this->results_)[i]; |
9662 | } | |
9663 | ||
1373401e | 9664 | // Set the number of results expected from a call expression. |
9665 | ||
9666 | void | |
9667 | Call_expression::set_expected_result_count(size_t count) | |
9668 | { | |
9669 | go_assert(this->expected_result_count_ == 0); | |
9670 | this->expected_result_count_ = count; | |
9671 | } | |
9672 | ||
e440a328 | 9673 | // Return whether this is a call to the predeclared function recover. |
9674 | ||
9675 | bool | |
9676 | Call_expression::is_recover_call() const | |
9677 | { | |
9678 | return this->do_is_recover_call(); | |
9679 | } | |
9680 | ||
9681 | // Set the argument to the recover function. | |
9682 | ||
9683 | void | |
9684 | Call_expression::set_recover_arg(Expression* arg) | |
9685 | { | |
9686 | this->do_set_recover_arg(arg); | |
9687 | } | |
9688 | ||
9689 | // Virtual functions also implemented by Builtin_call_expression. | |
9690 | ||
9691 | bool | |
9692 | Call_expression::do_is_recover_call() const | |
9693 | { | |
9694 | return false; | |
9695 | } | |
9696 | ||
9697 | void | |
9698 | Call_expression::do_set_recover_arg(Expression*) | |
9699 | { | |
c3e6f413 | 9700 | go_unreachable(); |
e440a328 | 9701 | } |
9702 | ||
ceeb4318 | 9703 | // We have found an error with this call expression; return true if |
9704 | // we should report it. | |
9705 | ||
9706 | bool | |
9707 | Call_expression::issue_error() | |
9708 | { | |
9709 | if (this->issued_error_) | |
9710 | return false; | |
9711 | else | |
9712 | { | |
9713 | this->issued_error_ = true; | |
9714 | return true; | |
9715 | } | |
9716 | } | |
9717 | ||
5bf8be8b | 9718 | // Whether or not this call contains errors, either in the call or the |
9719 | // arguments to the call. | |
9720 | ||
9721 | bool | |
9722 | Call_expression::is_erroneous_call() | |
9723 | { | |
9724 | if (this->is_error_expression() || this->fn()->is_error_expression()) | |
9725 | return true; | |
9726 | ||
9727 | if (this->args() == NULL) | |
9728 | return false; | |
9729 | for (Expression_list::iterator pa = this->args()->begin(); | |
9730 | pa != this->args()->end(); | |
9731 | ++pa) | |
9732 | { | |
9733 | if ((*pa)->type()->is_error_type() || (*pa)->is_error_expression()) | |
9734 | return true; | |
9735 | } | |
9736 | return false; | |
9737 | } | |
9738 | ||
e440a328 | 9739 | // Get the type. |
9740 | ||
9741 | Type* | |
9742 | Call_expression::do_type() | |
9743 | { | |
9744 | if (this->type_ != NULL) | |
9745 | return this->type_; | |
9746 | ||
9747 | Type* ret; | |
9748 | Function_type* fntype = this->get_function_type(); | |
9749 | if (fntype == NULL) | |
9750 | return Type::make_error_type(); | |
9751 | ||
9752 | const Typed_identifier_list* results = fntype->results(); | |
9753 | if (results == NULL) | |
9754 | ret = Type::make_void_type(); | |
9755 | else if (results->size() == 1) | |
9756 | ret = results->begin()->type(); | |
9757 | else | |
9758 | ret = Type::make_call_multiple_result_type(this); | |
9759 | ||
9760 | this->type_ = ret; | |
9761 | ||
9762 | return this->type_; | |
9763 | } | |
9764 | ||
9765 | // Determine types for a call expression. We can use the function | |
9766 | // parameter types to set the types of the arguments. | |
9767 | ||
9768 | void | |
9769 | Call_expression::do_determine_type(const Type_context*) | |
9770 | { | |
fb94b0ca | 9771 | if (!this->determining_types()) |
9772 | return; | |
9773 | ||
e440a328 | 9774 | this->fn_->determine_type_no_context(); |
9775 | Function_type* fntype = this->get_function_type(); | |
9776 | const Typed_identifier_list* parameters = NULL; | |
9777 | if (fntype != NULL) | |
9778 | parameters = fntype->parameters(); | |
9779 | if (this->args_ != NULL) | |
9780 | { | |
9781 | Typed_identifier_list::const_iterator pt; | |
9782 | if (parameters != NULL) | |
9783 | pt = parameters->begin(); | |
09ea332d | 9784 | bool first = true; |
e440a328 | 9785 | for (Expression_list::const_iterator pa = this->args_->begin(); |
9786 | pa != this->args_->end(); | |
9787 | ++pa) | |
9788 | { | |
09ea332d | 9789 | if (first) |
9790 | { | |
9791 | first = false; | |
9792 | // If this is a method, the first argument is the | |
9793 | // receiver. | |
9794 | if (fntype != NULL && fntype->is_method()) | |
9795 | { | |
9796 | Type* rtype = fntype->receiver()->type(); | |
9797 | // The receiver is always passed as a pointer. | |
9798 | if (rtype->points_to() == NULL) | |
9799 | rtype = Type::make_pointer_type(rtype); | |
9800 | Type_context subcontext(rtype, false); | |
9801 | (*pa)->determine_type(&subcontext); | |
9802 | continue; | |
9803 | } | |
9804 | } | |
9805 | ||
e440a328 | 9806 | if (parameters != NULL && pt != parameters->end()) |
9807 | { | |
9808 | Type_context subcontext(pt->type(), false); | |
9809 | (*pa)->determine_type(&subcontext); | |
9810 | ++pt; | |
9811 | } | |
9812 | else | |
9813 | (*pa)->determine_type_no_context(); | |
9814 | } | |
9815 | } | |
9816 | } | |
9817 | ||
fb94b0ca | 9818 | // Called when determining types for a Call_expression. Return true |
9819 | // if we should go ahead, false if they have already been determined. | |
9820 | ||
9821 | bool | |
9822 | Call_expression::determining_types() | |
9823 | { | |
9824 | if (this->types_are_determined_) | |
9825 | return false; | |
9826 | else | |
9827 | { | |
9828 | this->types_are_determined_ = true; | |
9829 | return true; | |
9830 | } | |
9831 | } | |
9832 | ||
e440a328 | 9833 | // Check types for parameter I. |
9834 | ||
9835 | bool | |
9836 | Call_expression::check_argument_type(int i, const Type* parameter_type, | |
9837 | const Type* argument_type, | |
b13c66cd | 9838 | Location argument_location, |
e440a328 | 9839 | bool issued_error) |
9840 | { | |
9841 | std::string reason; | |
1eae365b | 9842 | if (!Type::are_assignable(parameter_type, argument_type, &reason)) |
e440a328 | 9843 | { |
9844 | if (!issued_error) | |
9845 | { | |
9846 | if (reason.empty()) | |
631d5788 | 9847 | go_error_at(argument_location, "argument %d has incompatible type", i); |
e440a328 | 9848 | else |
631d5788 | 9849 | go_error_at(argument_location, |
9850 | "argument %d has incompatible type (%s)", | |
9851 | i, reason.c_str()); | |
e440a328 | 9852 | } |
9853 | this->set_is_error(); | |
9854 | return false; | |
9855 | } | |
9856 | return true; | |
9857 | } | |
9858 | ||
9859 | // Check types. | |
9860 | ||
9861 | void | |
9862 | Call_expression::do_check_types(Gogo*) | |
9863 | { | |
a6645f74 | 9864 | if (this->classification() == EXPRESSION_ERROR) |
9865 | return; | |
9866 | ||
e440a328 | 9867 | Function_type* fntype = this->get_function_type(); |
9868 | if (fntype == NULL) | |
9869 | { | |
5c13bd80 | 9870 | if (!this->fn_->type()->is_error()) |
e440a328 | 9871 | this->report_error(_("expected function")); |
9872 | return; | |
9873 | } | |
9874 | ||
1373401e | 9875 | if (this->expected_result_count_ != 0 |
9876 | && this->expected_result_count_ != this->result_count()) | |
9877 | { | |
9878 | if (this->issue_error()) | |
9879 | this->report_error(_("function result count mismatch")); | |
9880 | this->set_is_error(); | |
9881 | return; | |
9882 | } | |
9883 | ||
09ea332d | 9884 | bool is_method = fntype->is_method(); |
9885 | if (is_method) | |
e440a328 | 9886 | { |
09ea332d | 9887 | go_assert(this->args_ != NULL && !this->args_->empty()); |
9888 | Type* rtype = fntype->receiver()->type(); | |
9889 | Expression* first_arg = this->args_->front(); | |
1eae365b | 9890 | // We dereference the values since receivers are always passed |
9891 | // as pointers. | |
09ea332d | 9892 | std::string reason; |
1eae365b | 9893 | if (!Type::are_assignable(rtype->deref(), first_arg->type()->deref(), |
9894 | &reason)) | |
e440a328 | 9895 | { |
09ea332d | 9896 | if (reason.empty()) |
9897 | this->report_error(_("incompatible type for receiver")); | |
9898 | else | |
e440a328 | 9899 | { |
631d5788 | 9900 | go_error_at(this->location(), |
9901 | "incompatible type for receiver (%s)", | |
9902 | reason.c_str()); | |
09ea332d | 9903 | this->set_is_error(); |
e440a328 | 9904 | } |
9905 | } | |
9906 | } | |
9907 | ||
9908 | // Note that varargs was handled by the lower_varargs() method, so | |
a6645f74 | 9909 | // we don't have to worry about it here unless something is wrong. |
9910 | if (this->is_varargs_ && !this->varargs_are_lowered_) | |
9911 | { | |
9912 | if (!fntype->is_varargs()) | |
9913 | { | |
631d5788 | 9914 | go_error_at(this->location(), |
9915 | _("invalid use of %<...%> calling non-variadic function")); | |
a6645f74 | 9916 | this->set_is_error(); |
9917 | return; | |
9918 | } | |
9919 | } | |
e440a328 | 9920 | |
9921 | const Typed_identifier_list* parameters = fntype->parameters(); | |
9922 | if (this->args_ == NULL) | |
9923 | { | |
9924 | if (parameters != NULL && !parameters->empty()) | |
9925 | this->report_error(_("not enough arguments")); | |
9926 | } | |
9927 | else if (parameters == NULL) | |
09ea332d | 9928 | { |
9929 | if (!is_method || this->args_->size() > 1) | |
9930 | this->report_error(_("too many arguments")); | |
9931 | } | |
1373401e | 9932 | else if (this->args_->size() == 1 |
9933 | && this->args_->front()->call_expression() != NULL | |
9934 | && this->args_->front()->call_expression()->result_count() > 1) | |
9935 | { | |
9936 | // This is F(G()) when G returns more than one result. If the | |
9937 | // results can be matched to parameters, it would have been | |
9938 | // lowered in do_lower. If we get here we know there is a | |
9939 | // mismatch. | |
9940 | if (this->args_->front()->call_expression()->result_count() | |
9941 | < parameters->size()) | |
9942 | this->report_error(_("not enough arguments")); | |
9943 | else | |
9944 | this->report_error(_("too many arguments")); | |
9945 | } | |
e440a328 | 9946 | else |
9947 | { | |
9948 | int i = 0; | |
09ea332d | 9949 | Expression_list::const_iterator pa = this->args_->begin(); |
9950 | if (is_method) | |
9951 | ++pa; | |
9952 | for (Typed_identifier_list::const_iterator pt = parameters->begin(); | |
9953 | pt != parameters->end(); | |
9954 | ++pt, ++pa, ++i) | |
e440a328 | 9955 | { |
09ea332d | 9956 | if (pa == this->args_->end()) |
e440a328 | 9957 | { |
09ea332d | 9958 | this->report_error(_("not enough arguments")); |
e440a328 | 9959 | return; |
9960 | } | |
9961 | this->check_argument_type(i + 1, pt->type(), (*pa)->type(), | |
9962 | (*pa)->location(), false); | |
9963 | } | |
09ea332d | 9964 | if (pa != this->args_->end()) |
9965 | this->report_error(_("too many arguments")); | |
e440a328 | 9966 | } |
9967 | } | |
9968 | ||
72666aed | 9969 | Expression* |
9970 | Call_expression::do_copy() | |
9971 | { | |
9972 | Call_expression* call = | |
9973 | Expression::make_call(this->fn_->copy(), | |
9974 | (this->args_ == NULL | |
9975 | ? NULL | |
9976 | : this->args_->copy()), | |
9977 | this->is_varargs_, this->location()); | |
9978 | ||
9979 | if (this->varargs_are_lowered_) | |
9980 | call->set_varargs_are_lowered(); | |
9981 | return call; | |
9982 | } | |
9983 | ||
e440a328 | 9984 | // Return whether we have to use a temporary variable to ensure that |
9985 | // we evaluate this call expression in order. If the call returns no | |
ceeb4318 | 9986 | // results then it will inevitably be executed last. |
e440a328 | 9987 | |
9988 | bool | |
9989 | Call_expression::do_must_eval_in_order() const | |
9990 | { | |
ceeb4318 | 9991 | return this->result_count() > 0; |
e440a328 | 9992 | } |
9993 | ||
e440a328 | 9994 | // Get the function and the first argument to use when calling an |
9995 | // interface method. | |
9996 | ||
2387f644 | 9997 | Expression* |
e440a328 | 9998 | Call_expression::interface_method_function( |
e440a328 | 9999 | Interface_field_reference_expression* interface_method, |
2387f644 | 10000 | Expression** first_arg_ptr) |
e440a328 | 10001 | { |
2387f644 | 10002 | *first_arg_ptr = interface_method->get_underlying_object(); |
10003 | return interface_method->get_function(); | |
e440a328 | 10004 | } |
10005 | ||
10006 | // Build the call expression. | |
10007 | ||
ea664253 | 10008 | Bexpression* |
10009 | Call_expression::do_get_backend(Translate_context* context) | |
e440a328 | 10010 | { |
2c809f8f | 10011 | if (this->call_ != NULL) |
ea664253 | 10012 | return this->call_; |
e440a328 | 10013 | |
10014 | Function_type* fntype = this->get_function_type(); | |
10015 | if (fntype == NULL) | |
ea664253 | 10016 | return context->backend()->error_expression(); |
e440a328 | 10017 | |
10018 | if (this->fn_->is_error_expression()) | |
ea664253 | 10019 | return context->backend()->error_expression(); |
e440a328 | 10020 | |
10021 | Gogo* gogo = context->gogo(); | |
b13c66cd | 10022 | Location location = this->location(); |
e440a328 | 10023 | |
10024 | Func_expression* func = this->fn_->func_expression(); | |
e440a328 | 10025 | Interface_field_reference_expression* interface_method = |
10026 | this->fn_->interface_field_reference_expression(); | |
10027 | const bool has_closure = func != NULL && func->closure() != NULL; | |
09ea332d | 10028 | const bool is_interface_method = interface_method != NULL; |
e440a328 | 10029 | |
f8bdf81a | 10030 | bool has_closure_arg; |
8381eda7 | 10031 | if (has_closure) |
f8bdf81a | 10032 | has_closure_arg = true; |
8381eda7 | 10033 | else if (func != NULL) |
f8bdf81a | 10034 | has_closure_arg = false; |
8381eda7 | 10035 | else if (is_interface_method) |
f8bdf81a | 10036 | has_closure_arg = false; |
8381eda7 | 10037 | else |
f8bdf81a | 10038 | has_closure_arg = true; |
8381eda7 | 10039 | |
e440a328 | 10040 | int nargs; |
2c809f8f | 10041 | std::vector<Bexpression*> fn_args; |
e440a328 | 10042 | if (this->args_ == NULL || this->args_->empty()) |
10043 | { | |
f8bdf81a | 10044 | nargs = is_interface_method ? 1 : 0; |
2c809f8f | 10045 | if (nargs > 0) |
10046 | fn_args.resize(1); | |
e440a328 | 10047 | } |
09ea332d | 10048 | else if (fntype->parameters() == NULL || fntype->parameters()->empty()) |
10049 | { | |
10050 | // Passing a receiver parameter. | |
10051 | go_assert(!is_interface_method | |
10052 | && fntype->is_method() | |
10053 | && this->args_->size() == 1); | |
f8bdf81a | 10054 | nargs = 1; |
2c809f8f | 10055 | fn_args.resize(1); |
ea664253 | 10056 | fn_args[0] = this->args_->front()->get_backend(context); |
09ea332d | 10057 | } |
e440a328 | 10058 | else |
10059 | { | |
10060 | const Typed_identifier_list* params = fntype->parameters(); | |
e440a328 | 10061 | |
10062 | nargs = this->args_->size(); | |
09ea332d | 10063 | int i = is_interface_method ? 1 : 0; |
e440a328 | 10064 | nargs += i; |
2c809f8f | 10065 | fn_args.resize(nargs); |
e440a328 | 10066 | |
10067 | Typed_identifier_list::const_iterator pp = params->begin(); | |
09ea332d | 10068 | Expression_list::const_iterator pe = this->args_->begin(); |
10069 | if (!is_interface_method && fntype->is_method()) | |
10070 | { | |
ea664253 | 10071 | fn_args[i] = (*pe)->get_backend(context); |
09ea332d | 10072 | ++pe; |
10073 | ++i; | |
10074 | } | |
10075 | for (; pe != this->args_->end(); ++pe, ++pp, ++i) | |
e440a328 | 10076 | { |
c484d925 | 10077 | go_assert(pp != params->end()); |
2c809f8f | 10078 | Expression* arg = |
10079 | Expression::convert_for_assignment(gogo, pp->type(), *pe, | |
10080 | location); | |
ea664253 | 10081 | fn_args[i] = arg->get_backend(context); |
e440a328 | 10082 | } |
c484d925 | 10083 | go_assert(pp == params->end()); |
f8bdf81a | 10084 | go_assert(i == nargs); |
e440a328 | 10085 | } |
10086 | ||
2c809f8f | 10087 | Expression* fn; |
10088 | Expression* closure = NULL; | |
8381eda7 | 10089 | if (func != NULL) |
10090 | { | |
10091 | Named_object* no = func->named_object(); | |
2c809f8f | 10092 | fn = Expression::make_func_code_reference(no, location); |
10093 | if (has_closure) | |
10094 | closure = func->closure(); | |
8381eda7 | 10095 | } |
09ea332d | 10096 | else if (!is_interface_method) |
8381eda7 | 10097 | { |
2c809f8f | 10098 | closure = this->fn_; |
10099 | ||
10100 | // The backend representation of this function type is a pointer | |
10101 | // to a struct whose first field is the actual function to call. | |
10102 | Type* pfntype = | |
10103 | Type::make_pointer_type( | |
10104 | Type::make_pointer_type(Type::make_void_type())); | |
10105 | fn = Expression::make_unsafe_cast(pfntype, this->fn_, location); | |
10106 | fn = Expression::make_unary(OPERATOR_MULT, fn, location); | |
10107 | } | |
e440a328 | 10108 | else |
cf609de4 | 10109 | { |
2387f644 | 10110 | Expression* first_arg; |
2c809f8f | 10111 | fn = this->interface_method_function(interface_method, &first_arg); |
ea664253 | 10112 | fn_args[0] = first_arg->get_backend(context); |
e440a328 | 10113 | } |
10114 | ||
1ecc6157 | 10115 | Bexpression* bclosure = NULL; |
10116 | if (has_closure_arg) | |
10117 | bclosure = closure->get_backend(context); | |
f8bdf81a | 10118 | else |
1ecc6157 | 10119 | go_assert(closure == NULL); |
f8bdf81a | 10120 | |
ea664253 | 10121 | Bexpression* bfn = fn->get_backend(context); |
80d1e1a8 | 10122 | |
10123 | // When not calling a named function directly, use a type conversion | |
10124 | // in case the type of the function is a recursive type which refers | |
10125 | // to itself. We don't do this for an interface method because 1) | |
10126 | // an interface method never refers to itself, so we always have a | |
10127 | // function type here; 2) we pass an extra first argument to an | |
10128 | // interface method, so fntype is not correct. | |
10129 | if (func == NULL && !is_interface_method) | |
10130 | { | |
10131 | Btype* bft = fntype->get_backend_fntype(gogo); | |
10132 | bfn = gogo->backend()->convert_expression(bft, bfn, location); | |
10133 | } | |
10134 | ||
1ecc6157 | 10135 | Bexpression* call = gogo->backend()->call_expression(bfn, fn_args, |
10136 | bclosure, location); | |
e440a328 | 10137 | |
2c809f8f | 10138 | if (this->results_ != NULL) |
e440a328 | 10139 | { |
2c809f8f | 10140 | go_assert(this->call_temp_ != NULL); |
10141 | Expression* call_ref = | |
10142 | Expression::make_temporary_reference(this->call_temp_, location); | |
ea664253 | 10143 | Bexpression* bcall_ref = call_ref->get_backend(context); |
2c809f8f | 10144 | Bstatement* assn_stmt = |
10145 | gogo->backend()->assignment_statement(bcall_ref, call, location); | |
e440a328 | 10146 | |
2c809f8f | 10147 | this->call_ = this->set_results(context, bcall_ref); |
e440a328 | 10148 | |
2c809f8f | 10149 | Bexpression* set_and_call = |
10150 | gogo->backend()->compound_expression(assn_stmt, this->call_, | |
10151 | location); | |
ea664253 | 10152 | return set_and_call; |
2c809f8f | 10153 | } |
e440a328 | 10154 | |
2c809f8f | 10155 | this->call_ = call; |
ea664253 | 10156 | return this->call_; |
e440a328 | 10157 | } |
10158 | ||
ceeb4318 | 10159 | // Set the result variables if this call returns multiple results. |
10160 | ||
2c809f8f | 10161 | Bexpression* |
10162 | Call_expression::set_results(Translate_context* context, Bexpression* call) | |
ceeb4318 | 10163 | { |
2c809f8f | 10164 | Gogo* gogo = context->gogo(); |
ceeb4318 | 10165 | |
2c809f8f | 10166 | Bexpression* results = NULL; |
b13c66cd | 10167 | Location loc = this->location(); |
2c809f8f | 10168 | |
ceeb4318 | 10169 | size_t rc = this->result_count(); |
2c809f8f | 10170 | for (size_t i = 0; i < rc; ++i) |
ceeb4318 | 10171 | { |
ceeb4318 | 10172 | Temporary_statement* temp = this->result(i); |
cd238b8d | 10173 | if (temp == NULL) |
10174 | { | |
10175 | go_assert(saw_errors()); | |
2c809f8f | 10176 | return gogo->backend()->error_expression(); |
cd238b8d | 10177 | } |
ceeb4318 | 10178 | Temporary_reference_expression* ref = |
10179 | Expression::make_temporary_reference(temp, loc); | |
10180 | ref->set_is_lvalue(); | |
ceeb4318 | 10181 | |
ea664253 | 10182 | Bexpression* result_ref = ref->get_backend(context); |
2c809f8f | 10183 | Bexpression* call_result = |
10184 | gogo->backend()->struct_field_expression(call, i, loc); | |
10185 | Bstatement* assn_stmt = | |
10186 | gogo->backend()->assignment_statement(result_ref, call_result, loc); | |
ceeb4318 | 10187 | |
2c809f8f | 10188 | Bexpression* result = |
10189 | gogo->backend()->compound_expression(assn_stmt, call_result, loc); | |
ceeb4318 | 10190 | |
2c809f8f | 10191 | if (results == NULL) |
10192 | results = result; | |
10193 | else | |
10194 | { | |
10195 | Bstatement* expr_stmt = gogo->backend()->expression_statement(result); | |
10196 | results = | |
10197 | gogo->backend()->compound_expression(expr_stmt, results, loc); | |
10198 | } | |
10199 | } | |
10200 | return results; | |
ceeb4318 | 10201 | } |
10202 | ||
d751bb78 | 10203 | // Dump ast representation for a call expressin. |
10204 | ||
10205 | void | |
10206 | Call_expression::do_dump_expression(Ast_dump_context* ast_dump_context) const | |
10207 | { | |
10208 | this->fn_->dump_expression(ast_dump_context); | |
10209 | ast_dump_context->ostream() << "("; | |
10210 | if (args_ != NULL) | |
10211 | ast_dump_context->dump_expression_list(this->args_); | |
10212 | ||
10213 | ast_dump_context->ostream() << ") "; | |
10214 | } | |
10215 | ||
e440a328 | 10216 | // Make a call expression. |
10217 | ||
10218 | Call_expression* | |
10219 | Expression::make_call(Expression* fn, Expression_list* args, bool is_varargs, | |
b13c66cd | 10220 | Location location) |
e440a328 | 10221 | { |
10222 | return new Call_expression(fn, args, is_varargs, location); | |
10223 | } | |
10224 | ||
da244e59 | 10225 | // Class Call_result_expression. |
e440a328 | 10226 | |
10227 | // Traverse a call result. | |
10228 | ||
10229 | int | |
10230 | Call_result_expression::do_traverse(Traverse* traverse) | |
10231 | { | |
10232 | if (traverse->remember_expression(this->call_)) | |
10233 | { | |
10234 | // We have already traversed the call expression. | |
10235 | return TRAVERSE_CONTINUE; | |
10236 | } | |
10237 | return Expression::traverse(&this->call_, traverse); | |
10238 | } | |
10239 | ||
10240 | // Get the type. | |
10241 | ||
10242 | Type* | |
10243 | Call_result_expression::do_type() | |
10244 | { | |
425dd051 | 10245 | if (this->classification() == EXPRESSION_ERROR) |
10246 | return Type::make_error_type(); | |
10247 | ||
e440a328 | 10248 | // THIS->CALL_ can be replaced with a temporary reference due to |
10249 | // Call_expression::do_must_eval_in_order when there is an error. | |
10250 | Call_expression* ce = this->call_->call_expression(); | |
10251 | if (ce == NULL) | |
5e85f268 | 10252 | { |
10253 | this->set_is_error(); | |
10254 | return Type::make_error_type(); | |
10255 | } | |
e440a328 | 10256 | Function_type* fntype = ce->get_function_type(); |
10257 | if (fntype == NULL) | |
5e85f268 | 10258 | { |
e37658e2 | 10259 | if (ce->issue_error()) |
99b3f06f | 10260 | { |
10261 | if (!ce->fn()->type()->is_error()) | |
10262 | this->report_error(_("expected function")); | |
10263 | } | |
5e85f268 | 10264 | this->set_is_error(); |
10265 | return Type::make_error_type(); | |
10266 | } | |
e440a328 | 10267 | const Typed_identifier_list* results = fntype->results(); |
ceeb4318 | 10268 | if (results == NULL || results->size() < 2) |
7b8d861f | 10269 | { |
ceeb4318 | 10270 | if (ce->issue_error()) |
10271 | this->report_error(_("number of results does not match " | |
10272 | "number of values")); | |
7b8d861f | 10273 | return Type::make_error_type(); |
10274 | } | |
e440a328 | 10275 | Typed_identifier_list::const_iterator pr = results->begin(); |
10276 | for (unsigned int i = 0; i < this->index_; ++i) | |
10277 | { | |
10278 | if (pr == results->end()) | |
425dd051 | 10279 | break; |
e440a328 | 10280 | ++pr; |
10281 | } | |
10282 | if (pr == results->end()) | |
425dd051 | 10283 | { |
ceeb4318 | 10284 | if (ce->issue_error()) |
10285 | this->report_error(_("number of results does not match " | |
10286 | "number of values")); | |
425dd051 | 10287 | return Type::make_error_type(); |
10288 | } | |
e440a328 | 10289 | return pr->type(); |
10290 | } | |
10291 | ||
425dd051 | 10292 | // Check the type. Just make sure that we trigger the warning in |
10293 | // do_type. | |
e440a328 | 10294 | |
10295 | void | |
10296 | Call_result_expression::do_check_types(Gogo*) | |
10297 | { | |
425dd051 | 10298 | this->type(); |
e440a328 | 10299 | } |
10300 | ||
10301 | // Determine the type. We have nothing to do here, but the 0 result | |
10302 | // needs to pass down to the caller. | |
10303 | ||
10304 | void | |
10305 | Call_result_expression::do_determine_type(const Type_context*) | |
10306 | { | |
fb94b0ca | 10307 | this->call_->determine_type_no_context(); |
e440a328 | 10308 | } |
10309 | ||
ea664253 | 10310 | // Return the backend representation. We just refer to the temporary set by the |
10311 | // call expression. We don't do this at lowering time because it makes it | |
ceeb4318 | 10312 | // hard to evaluate the call at the right time. |
e440a328 | 10313 | |
ea664253 | 10314 | Bexpression* |
10315 | Call_result_expression::do_get_backend(Translate_context* context) | |
e440a328 | 10316 | { |
ceeb4318 | 10317 | Call_expression* ce = this->call_->call_expression(); |
cd238b8d | 10318 | if (ce == NULL) |
10319 | { | |
10320 | go_assert(this->call_->is_error_expression()); | |
ea664253 | 10321 | return context->backend()->error_expression(); |
cd238b8d | 10322 | } |
ceeb4318 | 10323 | Temporary_statement* ts = ce->result(this->index_); |
cd238b8d | 10324 | if (ts == NULL) |
10325 | { | |
10326 | go_assert(saw_errors()); | |
ea664253 | 10327 | return context->backend()->error_expression(); |
cd238b8d | 10328 | } |
ceeb4318 | 10329 | Expression* ref = Expression::make_temporary_reference(ts, this->location()); |
ea664253 | 10330 | return ref->get_backend(context); |
e440a328 | 10331 | } |
10332 | ||
d751bb78 | 10333 | // Dump ast representation for a call result expression. |
10334 | ||
10335 | void | |
10336 | Call_result_expression::do_dump_expression(Ast_dump_context* ast_dump_context) | |
10337 | const | |
10338 | { | |
10339 | // FIXME: Wouldn't it be better if the call is assigned to a temporary | |
10340 | // (struct) and the fields are referenced instead. | |
10341 | ast_dump_context->ostream() << this->index_ << "@("; | |
10342 | ast_dump_context->dump_expression(this->call_); | |
10343 | ast_dump_context->ostream() << ")"; | |
10344 | } | |
10345 | ||
e440a328 | 10346 | // Make a reference to a single result of a call which returns |
10347 | // multiple results. | |
10348 | ||
10349 | Expression* | |
10350 | Expression::make_call_result(Call_expression* call, unsigned int index) | |
10351 | { | |
10352 | return new Call_result_expression(call, index); | |
10353 | } | |
10354 | ||
10355 | // Class Index_expression. | |
10356 | ||
10357 | // Traversal. | |
10358 | ||
10359 | int | |
10360 | Index_expression::do_traverse(Traverse* traverse) | |
10361 | { | |
10362 | if (Expression::traverse(&this->left_, traverse) == TRAVERSE_EXIT | |
10363 | || Expression::traverse(&this->start_, traverse) == TRAVERSE_EXIT | |
10364 | || (this->end_ != NULL | |
acf2b673 | 10365 | && Expression::traverse(&this->end_, traverse) == TRAVERSE_EXIT) |
10366 | || (this->cap_ != NULL | |
10367 | && Expression::traverse(&this->cap_, traverse) == TRAVERSE_EXIT)) | |
e440a328 | 10368 | return TRAVERSE_EXIT; |
10369 | return TRAVERSE_CONTINUE; | |
10370 | } | |
10371 | ||
10372 | // Lower an index expression. This converts the generic index | |
10373 | // expression into an array index, a string index, or a map index. | |
10374 | ||
10375 | Expression* | |
ceeb4318 | 10376 | Index_expression::do_lower(Gogo*, Named_object*, Statement_inserter*, int) |
e440a328 | 10377 | { |
b13c66cd | 10378 | Location location = this->location(); |
e440a328 | 10379 | Expression* left = this->left_; |
10380 | Expression* start = this->start_; | |
10381 | Expression* end = this->end_; | |
acf2b673 | 10382 | Expression* cap = this->cap_; |
e440a328 | 10383 | |
10384 | Type* type = left->type(); | |
5c13bd80 | 10385 | if (type->is_error()) |
d9f3743a | 10386 | { |
10387 | go_assert(saw_errors()); | |
10388 | return Expression::make_error(location); | |
10389 | } | |
b0cf7ddd | 10390 | else if (left->is_type_expression()) |
10391 | { | |
631d5788 | 10392 | go_error_at(location, "attempt to index type expression"); |
b0cf7ddd | 10393 | return Expression::make_error(location); |
10394 | } | |
e440a328 | 10395 | else if (type->array_type() != NULL) |
acf2b673 | 10396 | return Expression::make_array_index(left, start, end, cap, location); |
e440a328 | 10397 | else if (type->points_to() != NULL |
10398 | && type->points_to()->array_type() != NULL | |
411eb89e | 10399 | && !type->points_to()->is_slice_type()) |
e440a328 | 10400 | { |
10401 | Expression* deref = Expression::make_unary(OPERATOR_MULT, left, | |
10402 | location); | |
38092374 | 10403 | |
10404 | // For an ordinary index into the array, the pointer will be | |
10405 | // dereferenced. For a slice it will not--the resulting slice | |
10406 | // will simply reuse the pointer, which is incorrect if that | |
10407 | // pointer is nil. | |
10408 | if (end != NULL || cap != NULL) | |
10409 | deref->issue_nil_check(); | |
10410 | ||
acf2b673 | 10411 | return Expression::make_array_index(deref, start, end, cap, location); |
e440a328 | 10412 | } |
10413 | else if (type->is_string_type()) | |
acf2b673 | 10414 | { |
10415 | if (cap != NULL) | |
10416 | { | |
631d5788 | 10417 | go_error_at(location, "invalid 3-index slice of string"); |
acf2b673 | 10418 | return Expression::make_error(location); |
10419 | } | |
10420 | return Expression::make_string_index(left, start, end, location); | |
10421 | } | |
e440a328 | 10422 | else if (type->map_type() != NULL) |
10423 | { | |
acf2b673 | 10424 | if (end != NULL || cap != NULL) |
e440a328 | 10425 | { |
631d5788 | 10426 | go_error_at(location, "invalid slice of map"); |
e440a328 | 10427 | return Expression::make_error(location); |
10428 | } | |
0d5530d9 | 10429 | return Expression::make_map_index(left, start, location); |
e440a328 | 10430 | } |
10431 | else | |
10432 | { | |
631d5788 | 10433 | go_error_at(location, |
10434 | "attempt to index object which is not array, string, or map"); | |
e440a328 | 10435 | return Expression::make_error(location); |
10436 | } | |
10437 | } | |
10438 | ||
acf2b673 | 10439 | // Write an indexed expression |
10440 | // (expr[expr:expr:expr], expr[expr:expr] or expr[expr]) to a dump context. | |
d751bb78 | 10441 | |
10442 | void | |
10443 | Index_expression::dump_index_expression(Ast_dump_context* ast_dump_context, | |
10444 | const Expression* expr, | |
10445 | const Expression* start, | |
acf2b673 | 10446 | const Expression* end, |
10447 | const Expression* cap) | |
d751bb78 | 10448 | { |
10449 | expr->dump_expression(ast_dump_context); | |
10450 | ast_dump_context->ostream() << "["; | |
10451 | start->dump_expression(ast_dump_context); | |
10452 | if (end != NULL) | |
10453 | { | |
10454 | ast_dump_context->ostream() << ":"; | |
10455 | end->dump_expression(ast_dump_context); | |
10456 | } | |
acf2b673 | 10457 | if (cap != NULL) |
10458 | { | |
10459 | ast_dump_context->ostream() << ":"; | |
10460 | cap->dump_expression(ast_dump_context); | |
10461 | } | |
d751bb78 | 10462 | ast_dump_context->ostream() << "]"; |
10463 | } | |
10464 | ||
10465 | // Dump ast representation for an index expression. | |
10466 | ||
10467 | void | |
10468 | Index_expression::do_dump_expression(Ast_dump_context* ast_dump_context) | |
10469 | const | |
10470 | { | |
10471 | Index_expression::dump_index_expression(ast_dump_context, this->left_, | |
acf2b673 | 10472 | this->start_, this->end_, this->cap_); |
d751bb78 | 10473 | } |
10474 | ||
e440a328 | 10475 | // Make an index expression. |
10476 | ||
10477 | Expression* | |
10478 | Expression::make_index(Expression* left, Expression* start, Expression* end, | |
acf2b673 | 10479 | Expression* cap, Location location) |
e440a328 | 10480 | { |
acf2b673 | 10481 | return new Index_expression(left, start, end, cap, location); |
e440a328 | 10482 | } |
10483 | ||
da244e59 | 10484 | // Class Array_index_expression. |
e440a328 | 10485 | |
10486 | // Array index traversal. | |
10487 | ||
10488 | int | |
10489 | Array_index_expression::do_traverse(Traverse* traverse) | |
10490 | { | |
10491 | if (Expression::traverse(&this->array_, traverse) == TRAVERSE_EXIT) | |
10492 | return TRAVERSE_EXIT; | |
10493 | if (Expression::traverse(&this->start_, traverse) == TRAVERSE_EXIT) | |
10494 | return TRAVERSE_EXIT; | |
10495 | if (this->end_ != NULL) | |
10496 | { | |
10497 | if (Expression::traverse(&this->end_, traverse) == TRAVERSE_EXIT) | |
10498 | return TRAVERSE_EXIT; | |
10499 | } | |
acf2b673 | 10500 | if (this->cap_ != NULL) |
10501 | { | |
10502 | if (Expression::traverse(&this->cap_, traverse) == TRAVERSE_EXIT) | |
10503 | return TRAVERSE_EXIT; | |
10504 | } | |
e440a328 | 10505 | return TRAVERSE_CONTINUE; |
10506 | } | |
10507 | ||
10508 | // Return the type of an array index. | |
10509 | ||
10510 | Type* | |
10511 | Array_index_expression::do_type() | |
10512 | { | |
10513 | if (this->type_ == NULL) | |
10514 | { | |
10515 | Array_type* type = this->array_->type()->array_type(); | |
10516 | if (type == NULL) | |
10517 | this->type_ = Type::make_error_type(); | |
10518 | else if (this->end_ == NULL) | |
10519 | this->type_ = type->element_type(); | |
411eb89e | 10520 | else if (type->is_slice_type()) |
e440a328 | 10521 | { |
10522 | // A slice of a slice has the same type as the original | |
10523 | // slice. | |
10524 | this->type_ = this->array_->type()->deref(); | |
10525 | } | |
10526 | else | |
10527 | { | |
10528 | // A slice of an array is a slice. | |
10529 | this->type_ = Type::make_array_type(type->element_type(), NULL); | |
10530 | } | |
10531 | } | |
10532 | return this->type_; | |
10533 | } | |
10534 | ||
10535 | // Set the type of an array index. | |
10536 | ||
10537 | void | |
10538 | Array_index_expression::do_determine_type(const Type_context*) | |
10539 | { | |
10540 | this->array_->determine_type_no_context(); | |
f77aa642 | 10541 | |
10542 | Type_context index_context(Type::lookup_integer_type("int"), false); | |
10543 | if (this->start_->is_constant()) | |
10544 | this->start_->determine_type(&index_context); | |
10545 | else | |
10546 | this->start_->determine_type_no_context(); | |
e440a328 | 10547 | if (this->end_ != NULL) |
f77aa642 | 10548 | { |
10549 | if (this->end_->is_constant()) | |
10550 | this->end_->determine_type(&index_context); | |
10551 | else | |
10552 | this->end_->determine_type_no_context(); | |
10553 | } | |
acf2b673 | 10554 | if (this->cap_ != NULL) |
f77aa642 | 10555 | { |
10556 | if (this->cap_->is_constant()) | |
10557 | this->cap_->determine_type(&index_context); | |
10558 | else | |
10559 | this->cap_->determine_type_no_context(); | |
10560 | } | |
e440a328 | 10561 | } |
10562 | ||
10563 | // Check types of an array index. | |
10564 | ||
10565 | void | |
d0a50ed8 | 10566 | Array_index_expression::do_check_types(Gogo* gogo) |
e440a328 | 10567 | { |
f6bc81e6 | 10568 | Numeric_constant nc; |
10569 | unsigned long v; | |
10570 | if (this->start_->type()->integer_type() == NULL | |
10571 | && !this->start_->type()->is_error() | |
10572 | && (!this->start_->numeric_constant_value(&nc) | |
10573 | || nc.to_unsigned_long(&v) == Numeric_constant::NC_UL_NOTINT)) | |
e440a328 | 10574 | this->report_error(_("index must be integer")); |
10575 | if (this->end_ != NULL | |
10576 | && this->end_->type()->integer_type() == NULL | |
99b3f06f | 10577 | && !this->end_->type()->is_error() |
10578 | && !this->end_->is_nil_expression() | |
f6bc81e6 | 10579 | && !this->end_->is_error_expression() |
10580 | && (!this->end_->numeric_constant_value(&nc) | |
10581 | || nc.to_unsigned_long(&v) == Numeric_constant::NC_UL_NOTINT)) | |
e440a328 | 10582 | this->report_error(_("slice end must be integer")); |
acf2b673 | 10583 | if (this->cap_ != NULL |
10584 | && this->cap_->type()->integer_type() == NULL | |
10585 | && !this->cap_->type()->is_error() | |
10586 | && !this->cap_->is_nil_expression() | |
10587 | && !this->cap_->is_error_expression() | |
10588 | && (!this->cap_->numeric_constant_value(&nc) | |
10589 | || nc.to_unsigned_long(&v) == Numeric_constant::NC_UL_NOTINT)) | |
10590 | this->report_error(_("slice capacity must be integer")); | |
e440a328 | 10591 | |
10592 | Array_type* array_type = this->array_->type()->array_type(); | |
f9c68f17 | 10593 | if (array_type == NULL) |
10594 | { | |
c484d925 | 10595 | go_assert(this->array_->type()->is_error()); |
f9c68f17 | 10596 | return; |
10597 | } | |
e440a328 | 10598 | |
10599 | unsigned int int_bits = | |
10600 | Type::lookup_integer_type("int")->integer_type()->bits(); | |
10601 | ||
0c77715b | 10602 | Numeric_constant lvalnc; |
e440a328 | 10603 | mpz_t lval; |
e440a328 | 10604 | bool lval_valid = (array_type->length() != NULL |
0c77715b | 10605 | && array_type->length()->numeric_constant_value(&lvalnc) |
10606 | && lvalnc.to_int(&lval)); | |
10607 | Numeric_constant inc; | |
e440a328 | 10608 | mpz_t ival; |
0bd5d859 | 10609 | bool ival_valid = false; |
0c77715b | 10610 | if (this->start_->numeric_constant_value(&inc) && inc.to_int(&ival)) |
e440a328 | 10611 | { |
0bd5d859 | 10612 | ival_valid = true; |
e440a328 | 10613 | if (mpz_sgn(ival) < 0 |
10614 | || mpz_sizeinbase(ival, 2) >= int_bits | |
10615 | || (lval_valid | |
10616 | && (this->end_ == NULL | |
10617 | ? mpz_cmp(ival, lval) >= 0 | |
10618 | : mpz_cmp(ival, lval) > 0))) | |
10619 | { | |
631d5788 | 10620 | go_error_at(this->start_->location(), "array index out of bounds"); |
e440a328 | 10621 | this->set_is_error(); |
10622 | } | |
10623 | } | |
10624 | if (this->end_ != NULL && !this->end_->is_nil_expression()) | |
10625 | { | |
0c77715b | 10626 | Numeric_constant enc; |
10627 | mpz_t eval; | |
acf2b673 | 10628 | bool eval_valid = false; |
0c77715b | 10629 | if (this->end_->numeric_constant_value(&enc) && enc.to_int(&eval)) |
e440a328 | 10630 | { |
acf2b673 | 10631 | eval_valid = true; |
0c77715b | 10632 | if (mpz_sgn(eval) < 0 |
10633 | || mpz_sizeinbase(eval, 2) >= int_bits | |
10634 | || (lval_valid && mpz_cmp(eval, lval) > 0)) | |
e440a328 | 10635 | { |
631d5788 | 10636 | go_error_at(this->end_->location(), "array index out of bounds"); |
e440a328 | 10637 | this->set_is_error(); |
10638 | } | |
0bd5d859 | 10639 | else if (ival_valid && mpz_cmp(ival, eval) > 0) |
10640 | this->report_error(_("inverted slice range")); | |
e440a328 | 10641 | } |
acf2b673 | 10642 | |
10643 | Numeric_constant cnc; | |
10644 | mpz_t cval; | |
10645 | if (this->cap_ != NULL | |
10646 | && this->cap_->numeric_constant_value(&cnc) && cnc.to_int(&cval)) | |
10647 | { | |
10648 | if (mpz_sgn(cval) < 0 | |
10649 | || mpz_sizeinbase(cval, 2) >= int_bits | |
10650 | || (lval_valid && mpz_cmp(cval, lval) > 0)) | |
10651 | { | |
631d5788 | 10652 | go_error_at(this->cap_->location(), "array index out of bounds"); |
acf2b673 | 10653 | this->set_is_error(); |
10654 | } | |
10655 | else if (ival_valid && mpz_cmp(ival, cval) > 0) | |
10656 | { | |
631d5788 | 10657 | go_error_at(this->cap_->location(), |
10658 | "invalid slice index: capacity less than start"); | |
acf2b673 | 10659 | this->set_is_error(); |
10660 | } | |
10661 | else if (eval_valid && mpz_cmp(eval, cval) > 0) | |
10662 | { | |
631d5788 | 10663 | go_error_at(this->cap_->location(), |
10664 | "invalid slice index: capacity less than length"); | |
acf2b673 | 10665 | this->set_is_error(); |
10666 | } | |
10667 | mpz_clear(cval); | |
10668 | } | |
10669 | ||
10670 | if (eval_valid) | |
10671 | mpz_clear(eval); | |
e440a328 | 10672 | } |
0bd5d859 | 10673 | if (ival_valid) |
10674 | mpz_clear(ival); | |
0c77715b | 10675 | if (lval_valid) |
10676 | mpz_clear(lval); | |
e440a328 | 10677 | |
10678 | // A slice of an array requires an addressable array. A slice of a | |
10679 | // slice is always possible. | |
411eb89e | 10680 | if (this->end_ != NULL && !array_type->is_slice_type()) |
88ec30c8 | 10681 | { |
10682 | if (!this->array_->is_addressable()) | |
8da39c3b | 10683 | this->report_error(_("slice of unaddressable value")); |
88ec30c8 | 10684 | else |
d0a50ed8 | 10685 | { |
10686 | bool escapes = true; | |
10687 | ||
10688 | // When compiling the runtime, a slice operation does not | |
10689 | // cause local variables to escape. When escape analysis | |
10690 | // becomes the default, this should be changed to make it an | |
10691 | // error if we have a slice operation that escapes. | |
10692 | if (gogo->compiling_runtime() && gogo->package_name() == "runtime") | |
10693 | escapes = false; | |
10694 | ||
10695 | this->array_->address_taken(escapes); | |
10696 | } | |
88ec30c8 | 10697 | } |
e440a328 | 10698 | } |
10699 | ||
2c809f8f | 10700 | // Flatten array indexing by using temporary variables for slices and indexes. |
35a54f17 | 10701 | |
10702 | Expression* | |
10703 | Array_index_expression::do_flatten(Gogo*, Named_object*, | |
10704 | Statement_inserter* inserter) | |
10705 | { | |
10706 | Location loc = this->location(); | |
5bf8be8b | 10707 | Expression* array = this->array_; |
10708 | Expression* start = this->start_; | |
10709 | Expression* end = this->end_; | |
10710 | Expression* cap = this->cap_; | |
10711 | if (array->is_error_expression() | |
10712 | || array->type()->is_error_type() | |
10713 | || start->is_error_expression() | |
10714 | || start->type()->is_error_type() | |
10715 | || (end != NULL | |
10716 | && (end->is_error_expression() || end->type()->is_error_type())) | |
10717 | || (cap != NULL | |
10718 | && (cap->is_error_expression() || cap->type()->is_error_type()))) | |
10719 | { | |
10720 | go_assert(saw_errors()); | |
10721 | return Expression::make_error(loc); | |
10722 | } | |
10723 | ||
2c809f8f | 10724 | Temporary_statement* temp; |
5bf8be8b | 10725 | if (array->type()->is_slice_type() && !array->is_variable()) |
35a54f17 | 10726 | { |
5bf8be8b | 10727 | temp = Statement::make_temporary(NULL, array, loc); |
35a54f17 | 10728 | inserter->insert(temp); |
10729 | this->array_ = Expression::make_temporary_reference(temp, loc); | |
10730 | } | |
5bf8be8b | 10731 | if (!start->is_variable()) |
2c809f8f | 10732 | { |
5bf8be8b | 10733 | temp = Statement::make_temporary(NULL, start, loc); |
2c809f8f | 10734 | inserter->insert(temp); |
10735 | this->start_ = Expression::make_temporary_reference(temp, loc); | |
10736 | } | |
5bf8be8b | 10737 | if (end != NULL |
10738 | && !end->is_nil_expression() | |
10739 | && !end->is_variable()) | |
2c809f8f | 10740 | { |
5bf8be8b | 10741 | temp = Statement::make_temporary(NULL, end, loc); |
2c809f8f | 10742 | inserter->insert(temp); |
10743 | this->end_ = Expression::make_temporary_reference(temp, loc); | |
10744 | } | |
5bf8be8b | 10745 | if (cap!= NULL && !cap->is_variable()) |
2c809f8f | 10746 | { |
5bf8be8b | 10747 | temp = Statement::make_temporary(NULL, cap, loc); |
2c809f8f | 10748 | inserter->insert(temp); |
10749 | this->cap_ = Expression::make_temporary_reference(temp, loc); | |
10750 | } | |
10751 | ||
35a54f17 | 10752 | return this; |
10753 | } | |
10754 | ||
e440a328 | 10755 | // Return whether this expression is addressable. |
10756 | ||
10757 | bool | |
10758 | Array_index_expression::do_is_addressable() const | |
10759 | { | |
10760 | // A slice expression is not addressable. | |
10761 | if (this->end_ != NULL) | |
10762 | return false; | |
10763 | ||
10764 | // An index into a slice is addressable. | |
411eb89e | 10765 | if (this->array_->type()->is_slice_type()) |
e440a328 | 10766 | return true; |
10767 | ||
10768 | // An index into an array is addressable if the array is | |
10769 | // addressable. | |
10770 | return this->array_->is_addressable(); | |
10771 | } | |
10772 | ||
ea664253 | 10773 | // Get the backend representation for an array index. |
e440a328 | 10774 | |
ea664253 | 10775 | Bexpression* |
10776 | Array_index_expression::do_get_backend(Translate_context* context) | |
e440a328 | 10777 | { |
e440a328 | 10778 | Array_type* array_type = this->array_->type()->array_type(); |
d8cd8e2d | 10779 | if (array_type == NULL) |
10780 | { | |
c484d925 | 10781 | go_assert(this->array_->type()->is_error()); |
ea664253 | 10782 | return context->backend()->error_expression(); |
d8cd8e2d | 10783 | } |
35a54f17 | 10784 | go_assert(!array_type->is_slice_type() || this->array_->is_variable()); |
e440a328 | 10785 | |
2c809f8f | 10786 | Location loc = this->location(); |
10787 | Gogo* gogo = context->gogo(); | |
10788 | ||
6dfedc16 | 10789 | Type* int_type = Type::lookup_integer_type("int"); |
10790 | Btype* int_btype = int_type->get_backend(gogo); | |
e440a328 | 10791 | |
2c809f8f | 10792 | // We need to convert the length and capacity to the Go "int" type here |
10793 | // because the length of a fixed-length array could be of type "uintptr" | |
10794 | // and gimple disallows binary operations between "uintptr" and other | |
10795 | // integer types. FIXME. | |
10796 | Bexpression* length = NULL; | |
a04bfdfc | 10797 | if (this->end_ == NULL || this->end_->is_nil_expression()) |
10798 | { | |
35a54f17 | 10799 | Expression* len = array_type->get_length(gogo, this->array_); |
ea664253 | 10800 | length = len->get_backend(context); |
2c809f8f | 10801 | length = gogo->backend()->convert_expression(int_btype, length, loc); |
a04bfdfc | 10802 | } |
10803 | ||
2c809f8f | 10804 | Bexpression* capacity = NULL; |
a04bfdfc | 10805 | if (this->end_ != NULL) |
10806 | { | |
35a54f17 | 10807 | Expression* cap = array_type->get_capacity(gogo, this->array_); |
ea664253 | 10808 | capacity = cap->get_backend(context); |
2c809f8f | 10809 | capacity = gogo->backend()->convert_expression(int_btype, capacity, loc); |
a04bfdfc | 10810 | } |
10811 | ||
2c809f8f | 10812 | Bexpression* cap_arg = capacity; |
acf2b673 | 10813 | if (this->cap_ != NULL) |
10814 | { | |
ea664253 | 10815 | cap_arg = this->cap_->get_backend(context); |
2c809f8f | 10816 | cap_arg = gogo->backend()->convert_expression(int_btype, cap_arg, loc); |
acf2b673 | 10817 | } |
10818 | ||
2c809f8f | 10819 | if (length == NULL) |
10820 | length = cap_arg; | |
e440a328 | 10821 | |
10822 | int code = (array_type->length() != NULL | |
10823 | ? (this->end_ == NULL | |
10824 | ? RUNTIME_ERROR_ARRAY_INDEX_OUT_OF_BOUNDS | |
10825 | : RUNTIME_ERROR_ARRAY_SLICE_OUT_OF_BOUNDS) | |
10826 | : (this->end_ == NULL | |
10827 | ? RUNTIME_ERROR_SLICE_INDEX_OUT_OF_BOUNDS | |
10828 | : RUNTIME_ERROR_SLICE_SLICE_OUT_OF_BOUNDS)); | |
ea664253 | 10829 | Bexpression* crash = gogo->runtime_error(code, loc)->get_backend(context); |
2c809f8f | 10830 | |
6dfedc16 | 10831 | if (this->start_->type()->integer_type() == NULL |
10832 | && !Type::are_convertible(int_type, this->start_->type(), NULL)) | |
10833 | { | |
10834 | go_assert(saw_errors()); | |
10835 | return context->backend()->error_expression(); | |
10836 | } | |
d9f3743a | 10837 | |
ea664253 | 10838 | Bexpression* bad_index = |
d9f3743a | 10839 | Expression::check_bounds(this->start_, loc)->get_backend(context); |
2c809f8f | 10840 | |
ea664253 | 10841 | Bexpression* start = this->start_->get_backend(context); |
2c809f8f | 10842 | start = gogo->backend()->convert_expression(int_btype, start, loc); |
10843 | Bexpression* start_too_large = | |
10844 | gogo->backend()->binary_expression((this->end_ == NULL | |
10845 | ? OPERATOR_GE | |
10846 | : OPERATOR_GT), | |
10847 | start, | |
10848 | (this->end_ == NULL | |
10849 | ? length | |
10850 | : capacity), | |
10851 | loc); | |
10852 | bad_index = gogo->backend()->binary_expression(OPERATOR_OROR, start_too_large, | |
10853 | bad_index, loc); | |
e440a328 | 10854 | |
10855 | if (this->end_ == NULL) | |
10856 | { | |
10857 | // Simple array indexing. This has to return an l-value, so | |
2c809f8f | 10858 | // wrap the index check into START. |
10859 | start = | |
10860 | gogo->backend()->conditional_expression(int_btype, bad_index, | |
10861 | crash, start, loc); | |
e440a328 | 10862 | |
2c809f8f | 10863 | Bexpression* ret; |
e440a328 | 10864 | if (array_type->length() != NULL) |
10865 | { | |
ea664253 | 10866 | Bexpression* array = this->array_->get_backend(context); |
2c809f8f | 10867 | ret = gogo->backend()->array_index_expression(array, start, loc); |
e440a328 | 10868 | } |
10869 | else | |
10870 | { | |
2c809f8f | 10871 | // Slice. |
10872 | Expression* valptr = | |
35a54f17 | 10873 | array_type->get_value_pointer(gogo, this->array_); |
ea664253 | 10874 | Bexpression* ptr = valptr->get_backend(context); |
2c809f8f | 10875 | ptr = gogo->backend()->pointer_offset_expression(ptr, start, loc); |
9b27b43c | 10876 | |
10877 | Type* ele_type = this->array_->type()->array_type()->element_type(); | |
10878 | Btype* ele_btype = ele_type->get_backend(gogo); | |
10879 | ret = gogo->backend()->indirect_expression(ele_btype, ptr, true, loc); | |
e440a328 | 10880 | } |
ea664253 | 10881 | return ret; |
e440a328 | 10882 | } |
10883 | ||
10884 | // Array slice. | |
10885 | ||
acf2b673 | 10886 | if (this->cap_ != NULL) |
10887 | { | |
2c809f8f | 10888 | Bexpression* bounds_bcheck = |
ea664253 | 10889 | Expression::check_bounds(this->cap_, loc)->get_backend(context); |
2c809f8f | 10890 | bad_index = |
10891 | gogo->backend()->binary_expression(OPERATOR_OROR, bounds_bcheck, | |
10892 | bad_index, loc); | |
10893 | cap_arg = gogo->backend()->convert_expression(int_btype, cap_arg, loc); | |
10894 | ||
10895 | Bexpression* cap_too_small = | |
10896 | gogo->backend()->binary_expression(OPERATOR_LT, cap_arg, start, loc); | |
10897 | Bexpression* cap_too_large = | |
10898 | gogo->backend()->binary_expression(OPERATOR_GT, cap_arg, capacity, loc); | |
10899 | Bexpression* bad_cap = | |
10900 | gogo->backend()->binary_expression(OPERATOR_OROR, cap_too_small, | |
10901 | cap_too_large, loc); | |
10902 | bad_index = gogo->backend()->binary_expression(OPERATOR_OROR, bad_cap, | |
10903 | bad_index, loc); | |
10904 | } | |
10905 | ||
10906 | Bexpression* end; | |
e440a328 | 10907 | if (this->end_->is_nil_expression()) |
2c809f8f | 10908 | end = length; |
e440a328 | 10909 | else |
10910 | { | |
2c809f8f | 10911 | Bexpression* bounds_bcheck = |
ea664253 | 10912 | Expression::check_bounds(this->end_, loc)->get_backend(context); |
e440a328 | 10913 | |
2c809f8f | 10914 | bad_index = |
10915 | gogo->backend()->binary_expression(OPERATOR_OROR, bounds_bcheck, | |
10916 | bad_index, loc); | |
e440a328 | 10917 | |
ea664253 | 10918 | end = this->end_->get_backend(context); |
2c809f8f | 10919 | end = gogo->backend()->convert_expression(int_btype, end, loc); |
10920 | Bexpression* end_too_small = | |
10921 | gogo->backend()->binary_expression(OPERATOR_LT, end, start, loc); | |
10922 | Bexpression* end_too_large = | |
10923 | gogo->backend()->binary_expression(OPERATOR_GT, end, cap_arg, loc); | |
10924 | Bexpression* bad_end = | |
10925 | gogo->backend()->binary_expression(OPERATOR_OROR, end_too_small, | |
10926 | end_too_large, loc); | |
10927 | bad_index = gogo->backend()->binary_expression(OPERATOR_OROR, bad_end, | |
10928 | bad_index, loc); | |
e440a328 | 10929 | } |
10930 | ||
35a54f17 | 10931 | Expression* valptr = array_type->get_value_pointer(gogo, this->array_); |
ea664253 | 10932 | Bexpression* val = valptr->get_backend(context); |
2c809f8f | 10933 | val = gogo->backend()->pointer_offset_expression(val, start, loc); |
e440a328 | 10934 | |
2c809f8f | 10935 | Bexpression* result_length = |
10936 | gogo->backend()->binary_expression(OPERATOR_MINUS, end, start, loc); | |
e440a328 | 10937 | |
2c809f8f | 10938 | Bexpression* result_capacity = |
10939 | gogo->backend()->binary_expression(OPERATOR_MINUS, cap_arg, start, loc); | |
e440a328 | 10940 | |
2c809f8f | 10941 | Btype* struct_btype = this->type()->get_backend(gogo); |
10942 | std::vector<Bexpression*> init; | |
10943 | init.push_back(val); | |
10944 | init.push_back(result_length); | |
10945 | init.push_back(result_capacity); | |
e440a328 | 10946 | |
2c809f8f | 10947 | Bexpression* ctor = |
10948 | gogo->backend()->constructor_expression(struct_btype, init, loc); | |
ea664253 | 10949 | return gogo->backend()->conditional_expression(struct_btype, bad_index, |
10950 | crash, ctor, loc); | |
e440a328 | 10951 | } |
10952 | ||
d751bb78 | 10953 | // Dump ast representation for an array index expression. |
10954 | ||
10955 | void | |
10956 | Array_index_expression::do_dump_expression(Ast_dump_context* ast_dump_context) | |
10957 | const | |
10958 | { | |
10959 | Index_expression::dump_index_expression(ast_dump_context, this->array_, | |
acf2b673 | 10960 | this->start_, this->end_, this->cap_); |
d751bb78 | 10961 | } |
10962 | ||
acf2b673 | 10963 | // Make an array index expression. END and CAP may be NULL. |
e440a328 | 10964 | |
10965 | Expression* | |
10966 | Expression::make_array_index(Expression* array, Expression* start, | |
acf2b673 | 10967 | Expression* end, Expression* cap, |
10968 | Location location) | |
e440a328 | 10969 | { |
acf2b673 | 10970 | return new Array_index_expression(array, start, end, cap, location); |
e440a328 | 10971 | } |
10972 | ||
50075d74 | 10973 | // Class String_index_expression. |
e440a328 | 10974 | |
10975 | // String index traversal. | |
10976 | ||
10977 | int | |
10978 | String_index_expression::do_traverse(Traverse* traverse) | |
10979 | { | |
10980 | if (Expression::traverse(&this->string_, traverse) == TRAVERSE_EXIT) | |
10981 | return TRAVERSE_EXIT; | |
10982 | if (Expression::traverse(&this->start_, traverse) == TRAVERSE_EXIT) | |
10983 | return TRAVERSE_EXIT; | |
10984 | if (this->end_ != NULL) | |
10985 | { | |
10986 | if (Expression::traverse(&this->end_, traverse) == TRAVERSE_EXIT) | |
10987 | return TRAVERSE_EXIT; | |
10988 | } | |
10989 | return TRAVERSE_CONTINUE; | |
10990 | } | |
10991 | ||
2c809f8f | 10992 | Expression* |
10993 | String_index_expression::do_flatten(Gogo*, Named_object*, | |
10994 | Statement_inserter* inserter) | |
e440a328 | 10995 | { |
2c809f8f | 10996 | Location loc = this->location(); |
5bf8be8b | 10997 | Expression* string = this->string_; |
10998 | Expression* start = this->start_; | |
10999 | Expression* end = this->end_; | |
11000 | if (string->is_error_expression() | |
11001 | || string->type()->is_error_type() | |
11002 | || start->is_error_expression() | |
11003 | || start->type()->is_error_type() | |
11004 | || (end != NULL | |
11005 | && (end->is_error_expression() || end->type()->is_error_type()))) | |
11006 | { | |
11007 | go_assert(saw_errors()); | |
11008 | return Expression::make_error(loc); | |
11009 | } | |
11010 | ||
11011 | Temporary_statement* temp; | |
2c809f8f | 11012 | if (!this->string_->is_variable()) |
11013 | { | |
11014 | temp = Statement::make_temporary(NULL, this->string_, loc); | |
11015 | inserter->insert(temp); | |
11016 | this->string_ = Expression::make_temporary_reference(temp, loc); | |
11017 | } | |
11018 | if (!this->start_->is_variable()) | |
11019 | { | |
11020 | temp = Statement::make_temporary(NULL, this->start_, loc); | |
11021 | inserter->insert(temp); | |
11022 | this->start_ = Expression::make_temporary_reference(temp, loc); | |
11023 | } | |
11024 | if (this->end_ != NULL | |
11025 | && !this->end_->is_nil_expression() | |
11026 | && !this->end_->is_variable()) | |
11027 | { | |
11028 | temp = Statement::make_temporary(NULL, this->end_, loc); | |
11029 | inserter->insert(temp); | |
11030 | this->end_ = Expression::make_temporary_reference(temp, loc); | |
11031 | } | |
11032 | ||
11033 | return this; | |
11034 | } | |
11035 | ||
11036 | // Return the type of a string index. | |
11037 | ||
11038 | Type* | |
11039 | String_index_expression::do_type() | |
11040 | { | |
11041 | if (this->end_ == NULL) | |
11042 | return Type::lookup_integer_type("uint8"); | |
11043 | else | |
11044 | return this->string_->type(); | |
11045 | } | |
11046 | ||
11047 | // Determine the type of a string index. | |
11048 | ||
11049 | void | |
11050 | String_index_expression::do_determine_type(const Type_context*) | |
11051 | { | |
11052 | this->string_->determine_type_no_context(); | |
f77aa642 | 11053 | |
11054 | Type_context index_context(Type::lookup_integer_type("int"), false); | |
11055 | if (this->start_->is_constant()) | |
11056 | this->start_->determine_type(&index_context); | |
11057 | else | |
11058 | this->start_->determine_type_no_context(); | |
e440a328 | 11059 | if (this->end_ != NULL) |
f77aa642 | 11060 | { |
11061 | if (this->end_->is_constant()) | |
11062 | this->end_->determine_type(&index_context); | |
11063 | else | |
11064 | this->end_->determine_type_no_context(); | |
11065 | } | |
e440a328 | 11066 | } |
11067 | ||
11068 | // Check types of a string index. | |
11069 | ||
11070 | void | |
11071 | String_index_expression::do_check_types(Gogo*) | |
11072 | { | |
acdc230d | 11073 | Numeric_constant nc; |
11074 | unsigned long v; | |
11075 | if (this->start_->type()->integer_type() == NULL | |
11076 | && !this->start_->type()->is_error() | |
11077 | && (!this->start_->numeric_constant_value(&nc) | |
11078 | || nc.to_unsigned_long(&v) == Numeric_constant::NC_UL_NOTINT)) | |
e440a328 | 11079 | this->report_error(_("index must be integer")); |
11080 | if (this->end_ != NULL | |
11081 | && this->end_->type()->integer_type() == NULL | |
acdc230d | 11082 | && !this->end_->type()->is_error() |
11083 | && !this->end_->is_nil_expression() | |
11084 | && !this->end_->is_error_expression() | |
11085 | && (!this->end_->numeric_constant_value(&nc) | |
11086 | || nc.to_unsigned_long(&v) == Numeric_constant::NC_UL_NOTINT)) | |
e440a328 | 11087 | this->report_error(_("slice end must be integer")); |
11088 | ||
11089 | std::string sval; | |
11090 | bool sval_valid = this->string_->string_constant_value(&sval); | |
11091 | ||
0c77715b | 11092 | Numeric_constant inc; |
e440a328 | 11093 | mpz_t ival; |
0bd5d859 | 11094 | bool ival_valid = false; |
0c77715b | 11095 | if (this->start_->numeric_constant_value(&inc) && inc.to_int(&ival)) |
e440a328 | 11096 | { |
0bd5d859 | 11097 | ival_valid = true; |
e440a328 | 11098 | if (mpz_sgn(ival) < 0 |
b10f32fb | 11099 | || (sval_valid |
11100 | && (this->end_ == NULL | |
11101 | ? mpz_cmp_ui(ival, sval.length()) >= 0 | |
11102 | : mpz_cmp_ui(ival, sval.length()) > 0))) | |
e440a328 | 11103 | { |
631d5788 | 11104 | go_error_at(this->start_->location(), "string index out of bounds"); |
e440a328 | 11105 | this->set_is_error(); |
11106 | } | |
11107 | } | |
11108 | if (this->end_ != NULL && !this->end_->is_nil_expression()) | |
11109 | { | |
0c77715b | 11110 | Numeric_constant enc; |
11111 | mpz_t eval; | |
11112 | if (this->end_->numeric_constant_value(&enc) && enc.to_int(&eval)) | |
e440a328 | 11113 | { |
0c77715b | 11114 | if (mpz_sgn(eval) < 0 |
11115 | || (sval_valid && mpz_cmp_ui(eval, sval.length()) > 0)) | |
e440a328 | 11116 | { |
631d5788 | 11117 | go_error_at(this->end_->location(), "string index out of bounds"); |
e440a328 | 11118 | this->set_is_error(); |
11119 | } | |
0bd5d859 | 11120 | else if (ival_valid && mpz_cmp(ival, eval) > 0) |
11121 | this->report_error(_("inverted slice range")); | |
0c77715b | 11122 | mpz_clear(eval); |
e440a328 | 11123 | } |
11124 | } | |
0bd5d859 | 11125 | if (ival_valid) |
11126 | mpz_clear(ival); | |
e440a328 | 11127 | } |
11128 | ||
ea664253 | 11129 | // Get the backend representation for a string index. |
e440a328 | 11130 | |
ea664253 | 11131 | Bexpression* |
11132 | String_index_expression::do_get_backend(Translate_context* context) | |
e440a328 | 11133 | { |
b13c66cd | 11134 | Location loc = this->location(); |
2c809f8f | 11135 | Expression* string_arg = this->string_; |
11136 | if (this->string_->type()->points_to() != NULL) | |
11137 | string_arg = Expression::make_unary(OPERATOR_MULT, this->string_, loc); | |
e440a328 | 11138 | |
2c809f8f | 11139 | Expression* bad_index = Expression::check_bounds(this->start_, loc); |
e440a328 | 11140 | |
2c809f8f | 11141 | int code = (this->end_ == NULL |
11142 | ? RUNTIME_ERROR_STRING_INDEX_OUT_OF_BOUNDS | |
11143 | : RUNTIME_ERROR_STRING_SLICE_OUT_OF_BOUNDS); | |
e440a328 | 11144 | |
2c809f8f | 11145 | Gogo* gogo = context->gogo(); |
ea664253 | 11146 | Bexpression* crash = gogo->runtime_error(code, loc)->get_backend(context); |
1b1f2abf | 11147 | |
11148 | Type* int_type = Type::lookup_integer_type("int"); | |
e440a328 | 11149 | |
2c809f8f | 11150 | // It is possible that an error occurred earlier because the start index |
11151 | // cannot be represented as an integer type. In this case, we shouldn't | |
11152 | // try casting the starting index into an integer since | |
11153 | // Type_conversion_expression will fail to get the backend representation. | |
11154 | // FIXME. | |
11155 | if (this->start_->type()->integer_type() == NULL | |
11156 | && !Type::are_convertible(int_type, this->start_->type(), NULL)) | |
11157 | { | |
11158 | go_assert(saw_errors()); | |
ea664253 | 11159 | return context->backend()->error_expression(); |
2c809f8f | 11160 | } |
e440a328 | 11161 | |
2c809f8f | 11162 | Expression* start = Expression::make_cast(int_type, this->start_, loc); |
e440a328 | 11163 | |
2c809f8f | 11164 | if (this->end_ == NULL) |
11165 | { | |
11166 | Expression* length = | |
11167 | Expression::make_string_info(this->string_, STRING_INFO_LENGTH, loc); | |
e440a328 | 11168 | |
2c809f8f | 11169 | Expression* start_too_large = |
11170 | Expression::make_binary(OPERATOR_GE, start, length, loc); | |
11171 | bad_index = Expression::make_binary(OPERATOR_OROR, start_too_large, | |
11172 | bad_index, loc); | |
11173 | Expression* bytes = | |
11174 | Expression::make_string_info(this->string_, STRING_INFO_DATA, loc); | |
e440a328 | 11175 | |
ea664253 | 11176 | Bexpression* bstart = start->get_backend(context); |
11177 | Bexpression* ptr = bytes->get_backend(context); | |
2c809f8f | 11178 | ptr = gogo->backend()->pointer_offset_expression(ptr, bstart, loc); |
9b27b43c | 11179 | Btype* ubtype = Type::lookup_integer_type("uint8")->get_backend(gogo); |
11180 | Bexpression* index = | |
11181 | gogo->backend()->indirect_expression(ubtype, ptr, true, loc); | |
e440a328 | 11182 | |
2c809f8f | 11183 | Btype* byte_btype = bytes->type()->points_to()->get_backend(gogo); |
ea664253 | 11184 | Bexpression* index_error = bad_index->get_backend(context); |
11185 | return gogo->backend()->conditional_expression(byte_btype, index_error, | |
11186 | crash, index, loc); | |
2c809f8f | 11187 | } |
11188 | ||
11189 | Expression* end = NULL; | |
11190 | if (this->end_->is_nil_expression()) | |
e67508fa | 11191 | end = Expression::make_integer_sl(-1, int_type, loc); |
e440a328 | 11192 | else |
11193 | { | |
2c809f8f | 11194 | Expression* bounds_check = Expression::check_bounds(this->end_, loc); |
11195 | bad_index = | |
11196 | Expression::make_binary(OPERATOR_OROR, bounds_check, bad_index, loc); | |
11197 | end = Expression::make_cast(int_type, this->end_, loc); | |
e440a328 | 11198 | } |
2c809f8f | 11199 | |
11200 | Expression* strslice = Runtime::make_call(Runtime::STRING_SLICE, loc, 3, | |
11201 | string_arg, start, end); | |
ea664253 | 11202 | Bexpression* bstrslice = strslice->get_backend(context); |
2c809f8f | 11203 | |
11204 | Btype* str_btype = strslice->type()->get_backend(gogo); | |
ea664253 | 11205 | Bexpression* index_error = bad_index->get_backend(context); |
11206 | return gogo->backend()->conditional_expression(str_btype, index_error, | |
11207 | crash, bstrslice, loc); | |
e440a328 | 11208 | } |
11209 | ||
d751bb78 | 11210 | // Dump ast representation for a string index expression. |
11211 | ||
11212 | void | |
11213 | String_index_expression::do_dump_expression(Ast_dump_context* ast_dump_context) | |
11214 | const | |
11215 | { | |
acf2b673 | 11216 | Index_expression::dump_index_expression(ast_dump_context, this->string_, |
11217 | this->start_, this->end_, NULL); | |
d751bb78 | 11218 | } |
11219 | ||
e440a328 | 11220 | // Make a string index expression. END may be NULL. |
11221 | ||
11222 | Expression* | |
11223 | Expression::make_string_index(Expression* string, Expression* start, | |
b13c66cd | 11224 | Expression* end, Location location) |
e440a328 | 11225 | { |
11226 | return new String_index_expression(string, start, end, location); | |
11227 | } | |
11228 | ||
11229 | // Class Map_index. | |
11230 | ||
11231 | // Get the type of the map. | |
11232 | ||
11233 | Map_type* | |
11234 | Map_index_expression::get_map_type() const | |
11235 | { | |
0d5530d9 | 11236 | Map_type* mt = this->map_->type()->map_type(); |
c7524fae | 11237 | if (mt == NULL) |
c484d925 | 11238 | go_assert(saw_errors()); |
e440a328 | 11239 | return mt; |
11240 | } | |
11241 | ||
11242 | // Map index traversal. | |
11243 | ||
11244 | int | |
11245 | Map_index_expression::do_traverse(Traverse* traverse) | |
11246 | { | |
11247 | if (Expression::traverse(&this->map_, traverse) == TRAVERSE_EXIT) | |
11248 | return TRAVERSE_EXIT; | |
11249 | return Expression::traverse(&this->index_, traverse); | |
11250 | } | |
11251 | ||
2c809f8f | 11252 | // We need to pass in a pointer to the key, so flatten the index into a |
11253 | // temporary variable if it isn't already. The value pointer will be | |
11254 | // dereferenced and checked for nil, so flatten into a temporary to avoid | |
11255 | // recomputation. | |
11256 | ||
11257 | Expression* | |
91c0fd76 | 11258 | Map_index_expression::do_flatten(Gogo* gogo, Named_object*, |
2c809f8f | 11259 | Statement_inserter* inserter) |
11260 | { | |
91c0fd76 | 11261 | Location loc = this->location(); |
2c809f8f | 11262 | Map_type* mt = this->get_map_type(); |
5bf8be8b | 11263 | if (this->index()->is_error_expression() |
11264 | || this->index()->type()->is_error_type() | |
11265 | || mt->is_error_type()) | |
11266 | { | |
11267 | go_assert(saw_errors()); | |
11268 | return Expression::make_error(loc); | |
11269 | } | |
11270 | ||
91c0fd76 | 11271 | if (!Type::are_identical(mt->key_type(), this->index_->type(), false, NULL)) |
11272 | { | |
11273 | if (this->index_->type()->interface_type() != NULL | |
11274 | && !this->index_->is_variable()) | |
11275 | { | |
11276 | Temporary_statement* temp = | |
11277 | Statement::make_temporary(NULL, this->index_, loc); | |
11278 | inserter->insert(temp); | |
11279 | this->index_ = Expression::make_temporary_reference(temp, loc); | |
11280 | } | |
11281 | this->index_ = Expression::convert_for_assignment(gogo, mt->key_type(), | |
11282 | this->index_, loc); | |
11283 | } | |
2c809f8f | 11284 | |
11285 | if (!this->index_->is_variable()) | |
11286 | { | |
11287 | Temporary_statement* temp = Statement::make_temporary(NULL, this->index_, | |
91c0fd76 | 11288 | loc); |
2c809f8f | 11289 | inserter->insert(temp); |
91c0fd76 | 11290 | this->index_ = Expression::make_temporary_reference(temp, loc); |
2c809f8f | 11291 | } |
11292 | ||
11293 | if (this->value_pointer_ == NULL) | |
0d5530d9 | 11294 | this->get_value_pointer(gogo); |
5bf8be8b | 11295 | if (this->value_pointer_->is_error_expression() |
11296 | || this->value_pointer_->type()->is_error_type()) | |
11297 | return Expression::make_error(loc); | |
2c809f8f | 11298 | if (!this->value_pointer_->is_variable()) |
11299 | { | |
11300 | Temporary_statement* temp = | |
91c0fd76 | 11301 | Statement::make_temporary(NULL, this->value_pointer_, loc); |
2c809f8f | 11302 | inserter->insert(temp); |
91c0fd76 | 11303 | this->value_pointer_ = Expression::make_temporary_reference(temp, loc); |
2c809f8f | 11304 | } |
11305 | ||
11306 | return this; | |
11307 | } | |
11308 | ||
e440a328 | 11309 | // Return the type of a map index. |
11310 | ||
11311 | Type* | |
11312 | Map_index_expression::do_type() | |
11313 | { | |
c7524fae | 11314 | Map_type* mt = this->get_map_type(); |
11315 | if (mt == NULL) | |
11316 | return Type::make_error_type(); | |
0d5530d9 | 11317 | return mt->val_type(); |
e440a328 | 11318 | } |
11319 | ||
11320 | // Fix the type of a map index. | |
11321 | ||
11322 | void | |
11323 | Map_index_expression::do_determine_type(const Type_context*) | |
11324 | { | |
11325 | this->map_->determine_type_no_context(); | |
c7524fae | 11326 | Map_type* mt = this->get_map_type(); |
11327 | Type* key_type = mt == NULL ? NULL : mt->key_type(); | |
11328 | Type_context subcontext(key_type, false); | |
e440a328 | 11329 | this->index_->determine_type(&subcontext); |
11330 | } | |
11331 | ||
11332 | // Check types of a map index. | |
11333 | ||
11334 | void | |
11335 | Map_index_expression::do_check_types(Gogo*) | |
11336 | { | |
11337 | std::string reason; | |
c7524fae | 11338 | Map_type* mt = this->get_map_type(); |
11339 | if (mt == NULL) | |
11340 | return; | |
11341 | if (!Type::are_assignable(mt->key_type(), this->index_->type(), &reason)) | |
e440a328 | 11342 | { |
11343 | if (reason.empty()) | |
11344 | this->report_error(_("incompatible type for map index")); | |
11345 | else | |
11346 | { | |
631d5788 | 11347 | go_error_at(this->location(), "incompatible type for map index (%s)", |
11348 | reason.c_str()); | |
e440a328 | 11349 | this->set_is_error(); |
11350 | } | |
11351 | } | |
11352 | } | |
11353 | ||
ea664253 | 11354 | // Get the backend representation for a map index. |
e440a328 | 11355 | |
ea664253 | 11356 | Bexpression* |
11357 | Map_index_expression::do_get_backend(Translate_context* context) | |
e440a328 | 11358 | { |
11359 | Map_type* type = this->get_map_type(); | |
c7524fae | 11360 | if (type == NULL) |
2c809f8f | 11361 | { |
11362 | go_assert(saw_errors()); | |
ea664253 | 11363 | return context->backend()->error_expression(); |
2c809f8f | 11364 | } |
e440a328 | 11365 | |
2c809f8f | 11366 | go_assert(this->value_pointer_ != NULL |
11367 | && this->value_pointer_->is_variable()); | |
e440a328 | 11368 | |
0d5530d9 | 11369 | Expression* val = Expression::make_unary(OPERATOR_MULT, this->value_pointer_, |
11370 | this->location()); | |
11371 | return val->get_backend(context); | |
e440a328 | 11372 | } |
11373 | ||
0d5530d9 | 11374 | // Get an expression for the map index. This returns an expression |
11375 | // that evaluates to a pointer to a value. If the key is not in the | |
11376 | // map, the pointer will point to a zero value. | |
e440a328 | 11377 | |
2c809f8f | 11378 | Expression* |
0d5530d9 | 11379 | Map_index_expression::get_value_pointer(Gogo* gogo) |
e440a328 | 11380 | { |
2c809f8f | 11381 | if (this->value_pointer_ == NULL) |
746d2e73 | 11382 | { |
2c809f8f | 11383 | Map_type* type = this->get_map_type(); |
11384 | if (type == NULL) | |
746d2e73 | 11385 | { |
2c809f8f | 11386 | go_assert(saw_errors()); |
11387 | return Expression::make_error(this->location()); | |
746d2e73 | 11388 | } |
e440a328 | 11389 | |
2c809f8f | 11390 | Location loc = this->location(); |
11391 | Expression* map_ref = this->map_; | |
e440a328 | 11392 | |
0d5530d9 | 11393 | Expression* index_ptr = Expression::make_unary(OPERATOR_AND, |
11394 | this->index_, | |
2c809f8f | 11395 | loc); |
0d5530d9 | 11396 | |
11397 | Expression* zero = type->fat_zero_value(gogo); | |
11398 | ||
11399 | Expression* map_index; | |
11400 | ||
11401 | if (zero == NULL) | |
11402 | map_index = | |
11403 | Runtime::make_call(Runtime::MAPACCESS1, loc, 3, | |
11404 | Expression::make_type_descriptor(type, loc), | |
11405 | map_ref, index_ptr); | |
11406 | else | |
11407 | map_index = | |
11408 | Runtime::make_call(Runtime::MAPACCESS1_FAT, loc, 4, | |
11409 | Expression::make_type_descriptor(type, loc), | |
11410 | map_ref, index_ptr, zero); | |
2c809f8f | 11411 | |
11412 | Type* val_type = type->val_type(); | |
11413 | this->value_pointer_ = | |
11414 | Expression::make_unsafe_cast(Type::make_pointer_type(val_type), | |
11415 | map_index, this->location()); | |
11416 | } | |
0d5530d9 | 11417 | |
2c809f8f | 11418 | return this->value_pointer_; |
e440a328 | 11419 | } |
11420 | ||
d751bb78 | 11421 | // Dump ast representation for a map index expression |
11422 | ||
11423 | void | |
11424 | Map_index_expression::do_dump_expression(Ast_dump_context* ast_dump_context) | |
11425 | const | |
11426 | { | |
acf2b673 | 11427 | Index_expression::dump_index_expression(ast_dump_context, this->map_, |
11428 | this->index_, NULL, NULL); | |
d751bb78 | 11429 | } |
11430 | ||
e440a328 | 11431 | // Make a map index expression. |
11432 | ||
11433 | Map_index_expression* | |
11434 | Expression::make_map_index(Expression* map, Expression* index, | |
b13c66cd | 11435 | Location location) |
e440a328 | 11436 | { |
11437 | return new Map_index_expression(map, index, location); | |
11438 | } | |
11439 | ||
11440 | // Class Field_reference_expression. | |
11441 | ||
149eabc5 | 11442 | // Lower a field reference expression. There is nothing to lower, but |
11443 | // this is where we generate the tracking information for fields with | |
11444 | // the magic go:"track" tag. | |
11445 | ||
11446 | Expression* | |
11447 | Field_reference_expression::do_lower(Gogo* gogo, Named_object* function, | |
11448 | Statement_inserter* inserter, int) | |
11449 | { | |
11450 | Struct_type* struct_type = this->expr_->type()->struct_type(); | |
11451 | if (struct_type == NULL) | |
11452 | { | |
11453 | // Error will be reported elsewhere. | |
11454 | return this; | |
11455 | } | |
11456 | const Struct_field* field = struct_type->field(this->field_index_); | |
11457 | if (field == NULL) | |
11458 | return this; | |
11459 | if (!field->has_tag()) | |
11460 | return this; | |
11461 | if (field->tag().find("go:\"track\"") == std::string::npos) | |
11462 | return this; | |
11463 | ||
604e278d | 11464 | // References from functions generated by the compiler don't count. |
c6292d1d | 11465 | if (function != NULL && function->func_value()->is_type_specific_function()) |
604e278d | 11466 | return this; |
11467 | ||
149eabc5 | 11468 | // We have found a reference to a tracked field. Build a call to |
11469 | // the runtime function __go_fieldtrack with a string that describes | |
11470 | // the field. FIXME: We should only call this once per referenced | |
11471 | // field per function, not once for each reference to the field. | |
11472 | ||
11473 | if (this->called_fieldtrack_) | |
11474 | return this; | |
11475 | this->called_fieldtrack_ = true; | |
11476 | ||
11477 | Location loc = this->location(); | |
11478 | ||
11479 | std::string s = "fieldtrack \""; | |
11480 | Named_type* nt = this->expr_->type()->named_type(); | |
11481 | if (nt == NULL || nt->named_object()->package() == NULL) | |
11482 | s.append(gogo->pkgpath()); | |
11483 | else | |
11484 | s.append(nt->named_object()->package()->pkgpath()); | |
11485 | s.push_back('.'); | |
11486 | if (nt != NULL) | |
5c29ad36 | 11487 | s.append(Gogo::unpack_hidden_name(nt->name())); |
149eabc5 | 11488 | s.push_back('.'); |
11489 | s.append(field->field_name()); | |
11490 | s.push_back('"'); | |
11491 | ||
11492 | // We can't use a string here, because internally a string holds a | |
11493 | // pointer to the actual bytes; when the linker garbage collects the | |
11494 | // string, it won't garbage collect the bytes. So we use a | |
11495 | // [...]byte. | |
11496 | ||
e67508fa | 11497 | Expression* length_expr = Expression::make_integer_ul(s.length(), NULL, loc); |
149eabc5 | 11498 | |
11499 | Type* byte_type = gogo->lookup_global("byte")->type_value(); | |
11500 | Type* array_type = Type::make_array_type(byte_type, length_expr); | |
11501 | ||
11502 | Expression_list* bytes = new Expression_list(); | |
11503 | for (std::string::const_iterator p = s.begin(); p != s.end(); p++) | |
11504 | { | |
e67508fa | 11505 | unsigned char c = static_cast<unsigned char>(*p); |
11506 | bytes->push_back(Expression::make_integer_ul(c, NULL, loc)); | |
149eabc5 | 11507 | } |
11508 | ||
11509 | Expression* e = Expression::make_composite_literal(array_type, 0, false, | |
62750cd5 | 11510 | bytes, false, loc); |
149eabc5 | 11511 | |
11512 | Variable* var = new Variable(array_type, e, true, false, false, loc); | |
11513 | ||
11514 | static int count; | |
11515 | char buf[50]; | |
11516 | snprintf(buf, sizeof buf, "fieldtrack.%d", count); | |
11517 | ++count; | |
11518 | ||
11519 | Named_object* no = gogo->add_variable(buf, var); | |
11520 | e = Expression::make_var_reference(no, loc); | |
11521 | e = Expression::make_unary(OPERATOR_AND, e, loc); | |
11522 | ||
11523 | Expression* call = Runtime::make_call(Runtime::FIELDTRACK, loc, 1, e); | |
604e278d | 11524 | gogo->lower_expression(function, inserter, &call); |
149eabc5 | 11525 | inserter->insert(Statement::make_statement(call, false)); |
11526 | ||
11527 | // Put this function, and the global variable we just created, into | |
11528 | // unique sections. This will permit the linker to garbage collect | |
11529 | // them if they are not referenced. The effect is that the only | |
11530 | // strings, indicating field references, that will wind up in the | |
11531 | // executable will be those for functions that are actually needed. | |
66a6be58 | 11532 | if (function != NULL) |
11533 | function->func_value()->set_in_unique_section(); | |
149eabc5 | 11534 | var->set_in_unique_section(); |
11535 | ||
11536 | return this; | |
11537 | } | |
11538 | ||
e440a328 | 11539 | // Return the type of a field reference. |
11540 | ||
11541 | Type* | |
11542 | Field_reference_expression::do_type() | |
11543 | { | |
b0e628fb | 11544 | Type* type = this->expr_->type(); |
5c13bd80 | 11545 | if (type->is_error()) |
b0e628fb | 11546 | return type; |
11547 | Struct_type* struct_type = type->struct_type(); | |
c484d925 | 11548 | go_assert(struct_type != NULL); |
e440a328 | 11549 | return struct_type->field(this->field_index_)->type(); |
11550 | } | |
11551 | ||
11552 | // Check the types for a field reference. | |
11553 | ||
11554 | void | |
11555 | Field_reference_expression::do_check_types(Gogo*) | |
11556 | { | |
b0e628fb | 11557 | Type* type = this->expr_->type(); |
5c13bd80 | 11558 | if (type->is_error()) |
b0e628fb | 11559 | return; |
11560 | Struct_type* struct_type = type->struct_type(); | |
c484d925 | 11561 | go_assert(struct_type != NULL); |
11562 | go_assert(struct_type->field(this->field_index_) != NULL); | |
e440a328 | 11563 | } |
11564 | ||
ea664253 | 11565 | // Get the backend representation for a field reference. |
e440a328 | 11566 | |
ea664253 | 11567 | Bexpression* |
11568 | Field_reference_expression::do_get_backend(Translate_context* context) | |
e440a328 | 11569 | { |
ea664253 | 11570 | Bexpression* bstruct = this->expr_->get_backend(context); |
11571 | return context->gogo()->backend()->struct_field_expression(bstruct, | |
11572 | this->field_index_, | |
11573 | this->location()); | |
e440a328 | 11574 | } |
11575 | ||
d751bb78 | 11576 | // Dump ast representation for a field reference expression. |
11577 | ||
11578 | void | |
11579 | Field_reference_expression::do_dump_expression( | |
11580 | Ast_dump_context* ast_dump_context) const | |
11581 | { | |
11582 | this->expr_->dump_expression(ast_dump_context); | |
11583 | ast_dump_context->ostream() << "." << this->field_index_; | |
11584 | } | |
11585 | ||
e440a328 | 11586 | // Make a reference to a qualified identifier in an expression. |
11587 | ||
11588 | Field_reference_expression* | |
11589 | Expression::make_field_reference(Expression* expr, unsigned int field_index, | |
b13c66cd | 11590 | Location location) |
e440a328 | 11591 | { |
11592 | return new Field_reference_expression(expr, field_index, location); | |
11593 | } | |
11594 | ||
11595 | // Class Interface_field_reference_expression. | |
11596 | ||
2387f644 | 11597 | // Return an expression for the pointer to the function to call. |
e440a328 | 11598 | |
2387f644 | 11599 | Expression* |
11600 | Interface_field_reference_expression::get_function() | |
e440a328 | 11601 | { |
2387f644 | 11602 | Expression* ref = this->expr_; |
11603 | Location loc = this->location(); | |
11604 | if (ref->type()->points_to() != NULL) | |
11605 | ref = Expression::make_unary(OPERATOR_MULT, ref, loc); | |
e440a328 | 11606 | |
2387f644 | 11607 | Expression* mtable = |
11608 | Expression::make_interface_info(ref, INTERFACE_INFO_METHODS, loc); | |
11609 | Struct_type* mtable_type = mtable->type()->points_to()->struct_type(); | |
e440a328 | 11610 | |
11611 | std::string name = Gogo::unpack_hidden_name(this->name_); | |
2387f644 | 11612 | unsigned int index; |
11613 | const Struct_field* field = mtable_type->find_local_field(name, &index); | |
11614 | go_assert(field != NULL); | |
11615 | mtable = Expression::make_unary(OPERATOR_MULT, mtable, loc); | |
11616 | return Expression::make_field_reference(mtable, index, loc); | |
e440a328 | 11617 | } |
11618 | ||
2387f644 | 11619 | // Return an expression for the first argument to pass to the interface |
e440a328 | 11620 | // function. |
11621 | ||
2387f644 | 11622 | Expression* |
11623 | Interface_field_reference_expression::get_underlying_object() | |
e440a328 | 11624 | { |
2387f644 | 11625 | Expression* expr = this->expr_; |
11626 | if (expr->type()->points_to() != NULL) | |
11627 | expr = Expression::make_unary(OPERATOR_MULT, expr, this->location()); | |
11628 | return Expression::make_interface_info(expr, INTERFACE_INFO_OBJECT, | |
11629 | this->location()); | |
e440a328 | 11630 | } |
11631 | ||
11632 | // Traversal. | |
11633 | ||
11634 | int | |
11635 | Interface_field_reference_expression::do_traverse(Traverse* traverse) | |
11636 | { | |
11637 | return Expression::traverse(&this->expr_, traverse); | |
11638 | } | |
11639 | ||
0afbb937 | 11640 | // Lower the expression. If this expression is not called, we need to |
11641 | // evaluate the expression twice when converting to the backend | |
11642 | // interface. So introduce a temporary variable if necessary. | |
11643 | ||
11644 | Expression* | |
9782d556 | 11645 | Interface_field_reference_expression::do_flatten(Gogo*, Named_object*, |
11646 | Statement_inserter* inserter) | |
0afbb937 | 11647 | { |
5bf8be8b | 11648 | if (this->expr_->is_error_expression() |
11649 | || this->expr_->type()->is_error_type()) | |
11650 | { | |
11651 | go_assert(saw_errors()); | |
11652 | return Expression::make_error(this->location()); | |
11653 | } | |
11654 | ||
2387f644 | 11655 | if (!this->expr_->is_variable()) |
0afbb937 | 11656 | { |
11657 | Temporary_statement* temp = | |
11658 | Statement::make_temporary(this->expr_->type(), NULL, this->location()); | |
11659 | inserter->insert(temp); | |
11660 | this->expr_ = Expression::make_set_and_use_temporary(temp, this->expr_, | |
11661 | this->location()); | |
11662 | } | |
11663 | return this; | |
11664 | } | |
11665 | ||
e440a328 | 11666 | // Return the type of an interface field reference. |
11667 | ||
11668 | Type* | |
11669 | Interface_field_reference_expression::do_type() | |
11670 | { | |
11671 | Type* expr_type = this->expr_->type(); | |
11672 | ||
11673 | Type* points_to = expr_type->points_to(); | |
11674 | if (points_to != NULL) | |
11675 | expr_type = points_to; | |
11676 | ||
11677 | Interface_type* interface_type = expr_type->interface_type(); | |
11678 | if (interface_type == NULL) | |
11679 | return Type::make_error_type(); | |
11680 | ||
11681 | const Typed_identifier* method = interface_type->find_method(this->name_); | |
11682 | if (method == NULL) | |
11683 | return Type::make_error_type(); | |
11684 | ||
11685 | return method->type(); | |
11686 | } | |
11687 | ||
11688 | // Determine types. | |
11689 | ||
11690 | void | |
11691 | Interface_field_reference_expression::do_determine_type(const Type_context*) | |
11692 | { | |
11693 | this->expr_->determine_type_no_context(); | |
11694 | } | |
11695 | ||
11696 | // Check the types for an interface field reference. | |
11697 | ||
11698 | void | |
11699 | Interface_field_reference_expression::do_check_types(Gogo*) | |
11700 | { | |
11701 | Type* type = this->expr_->type(); | |
11702 | ||
11703 | Type* points_to = type->points_to(); | |
11704 | if (points_to != NULL) | |
11705 | type = points_to; | |
11706 | ||
11707 | Interface_type* interface_type = type->interface_type(); | |
11708 | if (interface_type == NULL) | |
5c491127 | 11709 | { |
11710 | if (!type->is_error_type()) | |
11711 | this->report_error(_("expected interface or pointer to interface")); | |
11712 | } | |
e440a328 | 11713 | else |
11714 | { | |
11715 | const Typed_identifier* method = | |
11716 | interface_type->find_method(this->name_); | |
11717 | if (method == NULL) | |
11718 | { | |
631d5788 | 11719 | go_error_at(this->location(), "method %qs not in interface", |
11720 | Gogo::message_name(this->name_).c_str()); | |
e440a328 | 11721 | this->set_is_error(); |
11722 | } | |
11723 | } | |
11724 | } | |
11725 | ||
0afbb937 | 11726 | // If an interface field reference is not simply called, then it is |
11727 | // represented as a closure. The closure will hold a single variable, | |
11728 | // the value of the interface on which the method should be called. | |
11729 | // The function will be a simple thunk that pulls the value from the | |
11730 | // closure and calls the method with the remaining arguments. | |
11731 | ||
11732 | // Because method values are not common, we don't build all thunks for | |
11733 | // all possible interface methods, but instead only build them as we | |
11734 | // need them. In particular, we even build them on demand for | |
11735 | // interface methods defined in other packages. | |
11736 | ||
11737 | Interface_field_reference_expression::Interface_method_thunks | |
11738 | Interface_field_reference_expression::interface_method_thunks; | |
11739 | ||
11740 | // Find or create the thunk to call method NAME on TYPE. | |
11741 | ||
11742 | Named_object* | |
11743 | Interface_field_reference_expression::create_thunk(Gogo* gogo, | |
11744 | Interface_type* type, | |
11745 | const std::string& name) | |
11746 | { | |
11747 | std::pair<Interface_type*, Method_thunks*> val(type, NULL); | |
11748 | std::pair<Interface_method_thunks::iterator, bool> ins = | |
11749 | Interface_field_reference_expression::interface_method_thunks.insert(val); | |
11750 | if (ins.second) | |
11751 | { | |
11752 | // This is the first time we have seen this interface. | |
11753 | ins.first->second = new Method_thunks(); | |
11754 | } | |
11755 | ||
11756 | for (Method_thunks::const_iterator p = ins.first->second->begin(); | |
11757 | p != ins.first->second->end(); | |
11758 | p++) | |
11759 | if (p->first == name) | |
11760 | return p->second; | |
11761 | ||
11762 | Location loc = type->location(); | |
11763 | ||
11764 | const Typed_identifier* method_id = type->find_method(name); | |
11765 | if (method_id == NULL) | |
11766 | return Named_object::make_erroneous_name(Gogo::thunk_name()); | |
11767 | ||
11768 | Function_type* orig_fntype = method_id->type()->function_type(); | |
11769 | if (orig_fntype == NULL) | |
11770 | return Named_object::make_erroneous_name(Gogo::thunk_name()); | |
11771 | ||
11772 | Struct_field_list* sfl = new Struct_field_list(); | |
f8bdf81a | 11773 | // The type here is wrong--it should be the C function type. But it |
11774 | // doesn't really matter. | |
0afbb937 | 11775 | Type* vt = Type::make_pointer_type(Type::make_void_type()); |
11776 | sfl->push_back(Struct_field(Typed_identifier("fn.0", vt, loc))); | |
11777 | sfl->push_back(Struct_field(Typed_identifier("val.1", type, loc))); | |
11778 | Type* closure_type = Type::make_struct_type(sfl, loc); | |
11779 | closure_type = Type::make_pointer_type(closure_type); | |
11780 | ||
f8bdf81a | 11781 | Function_type* new_fntype = orig_fntype->copy_with_names(); |
0afbb937 | 11782 | |
da244e59 | 11783 | std::string thunk_name = Gogo::thunk_name(); |
11784 | Named_object* new_no = gogo->start_function(thunk_name, new_fntype, | |
0afbb937 | 11785 | false, loc); |
11786 | ||
f8bdf81a | 11787 | Variable* cvar = new Variable(closure_type, NULL, false, false, false, loc); |
11788 | cvar->set_is_used(); | |
1ecc6157 | 11789 | cvar->set_is_closure(); |
da244e59 | 11790 | Named_object* cp = Named_object::make_variable("$closure" + thunk_name, |
11791 | NULL, cvar); | |
f8bdf81a | 11792 | new_no->func_value()->set_closure_var(cp); |
0afbb937 | 11793 | |
f8bdf81a | 11794 | gogo->start_block(loc); |
0afbb937 | 11795 | |
11796 | // Field 0 of the closure is the function code pointer, field 1 is | |
11797 | // the value on which to invoke the method. | |
11798 | Expression* arg = Expression::make_var_reference(cp, loc); | |
11799 | arg = Expression::make_unary(OPERATOR_MULT, arg, loc); | |
11800 | arg = Expression::make_field_reference(arg, 1, loc); | |
11801 | ||
11802 | Expression *ifre = Expression::make_interface_field_reference(arg, name, | |
11803 | loc); | |
11804 | ||
11805 | const Typed_identifier_list* orig_params = orig_fntype->parameters(); | |
11806 | Expression_list* args; | |
11807 | if (orig_params == NULL || orig_params->empty()) | |
11808 | args = NULL; | |
11809 | else | |
11810 | { | |
11811 | const Typed_identifier_list* new_params = new_fntype->parameters(); | |
11812 | args = new Expression_list(); | |
11813 | for (Typed_identifier_list::const_iterator p = new_params->begin(); | |
f8bdf81a | 11814 | p != new_params->end(); |
0afbb937 | 11815 | ++p) |
11816 | { | |
11817 | Named_object* p_no = gogo->lookup(p->name(), NULL); | |
11818 | go_assert(p_no != NULL | |
11819 | && p_no->is_variable() | |
11820 | && p_no->var_value()->is_parameter()); | |
11821 | args->push_back(Expression::make_var_reference(p_no, loc)); | |
11822 | } | |
11823 | } | |
11824 | ||
11825 | Call_expression* call = Expression::make_call(ifre, args, | |
11826 | orig_fntype->is_varargs(), | |
11827 | loc); | |
11828 | call->set_varargs_are_lowered(); | |
11829 | ||
11830 | Statement* s = Statement::make_return_from_call(call, loc); | |
11831 | gogo->add_statement(s); | |
11832 | Block* b = gogo->finish_block(loc); | |
11833 | gogo->add_block(b, loc); | |
11834 | gogo->lower_block(new_no, b); | |
a32698ee | 11835 | gogo->flatten_block(new_no, b); |
0afbb937 | 11836 | gogo->finish_function(loc); |
11837 | ||
11838 | ins.first->second->push_back(std::make_pair(name, new_no)); | |
11839 | return new_no; | |
11840 | } | |
11841 | ||
ea664253 | 11842 | // Get the backend representation for a method value. |
e440a328 | 11843 | |
ea664253 | 11844 | Bexpression* |
11845 | Interface_field_reference_expression::do_get_backend(Translate_context* context) | |
e440a328 | 11846 | { |
0afbb937 | 11847 | Interface_type* type = this->expr_->type()->interface_type(); |
11848 | if (type == NULL) | |
11849 | { | |
11850 | go_assert(saw_errors()); | |
ea664253 | 11851 | return context->backend()->error_expression(); |
0afbb937 | 11852 | } |
11853 | ||
11854 | Named_object* thunk = | |
11855 | Interface_field_reference_expression::create_thunk(context->gogo(), | |
11856 | type, this->name_); | |
11857 | if (thunk->is_erroneous()) | |
11858 | { | |
11859 | go_assert(saw_errors()); | |
ea664253 | 11860 | return context->backend()->error_expression(); |
0afbb937 | 11861 | } |
11862 | ||
11863 | // FIXME: We should lower this earlier, but we can't it lower it in | |
11864 | // the lowering pass because at that point we don't know whether we | |
11865 | // need to create the thunk or not. If the expression is called, we | |
11866 | // don't need the thunk. | |
11867 | ||
11868 | Location loc = this->location(); | |
11869 | ||
11870 | Struct_field_list* fields = new Struct_field_list(); | |
11871 | fields->push_back(Struct_field(Typed_identifier("fn.0", | |
11872 | thunk->func_value()->type(), | |
11873 | loc))); | |
11874 | fields->push_back(Struct_field(Typed_identifier("val.1", | |
11875 | this->expr_->type(), | |
11876 | loc))); | |
11877 | Struct_type* st = Type::make_struct_type(fields, loc); | |
11878 | ||
11879 | Expression_list* vals = new Expression_list(); | |
11880 | vals->push_back(Expression::make_func_code_reference(thunk, loc)); | |
11881 | vals->push_back(this->expr_); | |
11882 | ||
11883 | Expression* expr = Expression::make_struct_composite_literal(st, vals, loc); | |
ea664253 | 11884 | Bexpression* bclosure = |
11885 | Expression::make_heap_expression(expr, loc)->get_backend(context); | |
0afbb937 | 11886 | |
2387f644 | 11887 | Expression* nil_check = |
11888 | Expression::make_binary(OPERATOR_EQEQ, this->expr_, | |
11889 | Expression::make_nil(loc), loc); | |
ea664253 | 11890 | Bexpression* bnil_check = nil_check->get_backend(context); |
0afbb937 | 11891 | |
2387f644 | 11892 | Gogo* gogo = context->gogo(); |
ea664253 | 11893 | Bexpression* bcrash = gogo->runtime_error(RUNTIME_ERROR_NIL_DEREFERENCE, |
11894 | loc)->get_backend(context); | |
2387f644 | 11895 | |
11896 | Bexpression* bcond = | |
a32698ee | 11897 | gogo->backend()->conditional_expression(NULL, bnil_check, bcrash, NULL, loc); |
2387f644 | 11898 | Bstatement* cond_statement = gogo->backend()->expression_statement(bcond); |
ea664253 | 11899 | return gogo->backend()->compound_expression(cond_statement, bclosure, loc); |
e440a328 | 11900 | } |
11901 | ||
d751bb78 | 11902 | // Dump ast representation for an interface field reference. |
11903 | ||
11904 | void | |
11905 | Interface_field_reference_expression::do_dump_expression( | |
11906 | Ast_dump_context* ast_dump_context) const | |
11907 | { | |
11908 | this->expr_->dump_expression(ast_dump_context); | |
11909 | ast_dump_context->ostream() << "." << this->name_; | |
11910 | } | |
11911 | ||
e440a328 | 11912 | // Make a reference to a field in an interface. |
11913 | ||
11914 | Expression* | |
11915 | Expression::make_interface_field_reference(Expression* expr, | |
11916 | const std::string& field, | |
b13c66cd | 11917 | Location location) |
e440a328 | 11918 | { |
11919 | return new Interface_field_reference_expression(expr, field, location); | |
11920 | } | |
11921 | ||
11922 | // A general selector. This is a Parser_expression for LEFT.NAME. It | |
11923 | // is lowered after we know the type of the left hand side. | |
11924 | ||
11925 | class Selector_expression : public Parser_expression | |
11926 | { | |
11927 | public: | |
11928 | Selector_expression(Expression* left, const std::string& name, | |
b13c66cd | 11929 | Location location) |
e440a328 | 11930 | : Parser_expression(EXPRESSION_SELECTOR, location), |
11931 | left_(left), name_(name) | |
11932 | { } | |
11933 | ||
11934 | protected: | |
11935 | int | |
11936 | do_traverse(Traverse* traverse) | |
11937 | { return Expression::traverse(&this->left_, traverse); } | |
11938 | ||
11939 | Expression* | |
ceeb4318 | 11940 | do_lower(Gogo*, Named_object*, Statement_inserter*, int); |
e440a328 | 11941 | |
11942 | Expression* | |
11943 | do_copy() | |
11944 | { | |
11945 | return new Selector_expression(this->left_->copy(), this->name_, | |
11946 | this->location()); | |
11947 | } | |
11948 | ||
d751bb78 | 11949 | void |
11950 | do_dump_expression(Ast_dump_context* ast_dump_context) const; | |
11951 | ||
e440a328 | 11952 | private: |
11953 | Expression* | |
11954 | lower_method_expression(Gogo*); | |
11955 | ||
11956 | // The expression on the left hand side. | |
11957 | Expression* left_; | |
11958 | // The name on the right hand side. | |
11959 | std::string name_; | |
11960 | }; | |
11961 | ||
11962 | // Lower a selector expression once we know the real type of the left | |
11963 | // hand side. | |
11964 | ||
11965 | Expression* | |
ceeb4318 | 11966 | Selector_expression::do_lower(Gogo* gogo, Named_object*, Statement_inserter*, |
11967 | int) | |
e440a328 | 11968 | { |
11969 | Expression* left = this->left_; | |
11970 | if (left->is_type_expression()) | |
11971 | return this->lower_method_expression(gogo); | |
11972 | return Type::bind_field_or_method(gogo, left->type(), left, this->name_, | |
11973 | this->location()); | |
11974 | } | |
11975 | ||
11976 | // Lower a method expression T.M or (*T).M. We turn this into a | |
11977 | // function literal. | |
11978 | ||
11979 | Expression* | |
11980 | Selector_expression::lower_method_expression(Gogo* gogo) | |
11981 | { | |
b13c66cd | 11982 | Location location = this->location(); |
868b439e | 11983 | Type* left_type = this->left_->type(); |
11984 | Type* type = left_type; | |
e440a328 | 11985 | const std::string& name(this->name_); |
11986 | ||
11987 | bool is_pointer; | |
11988 | if (type->points_to() == NULL) | |
11989 | is_pointer = false; | |
11990 | else | |
11991 | { | |
11992 | is_pointer = true; | |
11993 | type = type->points_to(); | |
11994 | } | |
11995 | Named_type* nt = type->named_type(); | |
11996 | if (nt == NULL) | |
11997 | { | |
631d5788 | 11998 | go_error_at(location, |
11999 | ("method expression requires named type or " | |
12000 | "pointer to named type")); | |
e440a328 | 12001 | return Expression::make_error(location); |
12002 | } | |
12003 | ||
12004 | bool is_ambiguous; | |
12005 | Method* method = nt->method_function(name, &is_ambiguous); | |
ab1468c3 | 12006 | const Typed_identifier* imethod = NULL; |
dcc8506b | 12007 | if (method == NULL && !is_pointer) |
ab1468c3 | 12008 | { |
12009 | Interface_type* it = nt->interface_type(); | |
12010 | if (it != NULL) | |
12011 | imethod = it->find_method(name); | |
12012 | } | |
12013 | ||
868b439e | 12014 | if ((method == NULL && imethod == NULL) |
12015 | || (left_type->named_type() != NULL && left_type->points_to() != NULL)) | |
e440a328 | 12016 | { |
12017 | if (!is_ambiguous) | |
631d5788 | 12018 | go_error_at(location, "type %<%s%s%> has no method %<%s%>", |
12019 | is_pointer ? "*" : "", | |
12020 | nt->message_name().c_str(), | |
12021 | Gogo::message_name(name).c_str()); | |
e440a328 | 12022 | else |
631d5788 | 12023 | go_error_at(location, "method %<%s%s%> is ambiguous in type %<%s%>", |
12024 | Gogo::message_name(name).c_str(), | |
12025 | is_pointer ? "*" : "", | |
12026 | nt->message_name().c_str()); | |
e440a328 | 12027 | return Expression::make_error(location); |
12028 | } | |
12029 | ||
ab1468c3 | 12030 | if (method != NULL && !is_pointer && !method->is_value_method()) |
e440a328 | 12031 | { |
631d5788 | 12032 | go_error_at(location, "method requires pointer (use %<(*%s).%s%>)", |
12033 | nt->message_name().c_str(), | |
12034 | Gogo::message_name(name).c_str()); | |
e440a328 | 12035 | return Expression::make_error(location); |
12036 | } | |
12037 | ||
12038 | // Build a new function type in which the receiver becomes the first | |
12039 | // argument. | |
ab1468c3 | 12040 | Function_type* method_type; |
12041 | if (method != NULL) | |
12042 | { | |
12043 | method_type = method->type(); | |
c484d925 | 12044 | go_assert(method_type->is_method()); |
ab1468c3 | 12045 | } |
12046 | else | |
12047 | { | |
12048 | method_type = imethod->type()->function_type(); | |
c484d925 | 12049 | go_assert(method_type != NULL && !method_type->is_method()); |
ab1468c3 | 12050 | } |
e440a328 | 12051 | |
12052 | const char* const receiver_name = "$this"; | |
12053 | Typed_identifier_list* parameters = new Typed_identifier_list(); | |
12054 | parameters->push_back(Typed_identifier(receiver_name, this->left_->type(), | |
12055 | location)); | |
12056 | ||
12057 | const Typed_identifier_list* method_parameters = method_type->parameters(); | |
12058 | if (method_parameters != NULL) | |
12059 | { | |
f470da59 | 12060 | int i = 0; |
e440a328 | 12061 | for (Typed_identifier_list::const_iterator p = method_parameters->begin(); |
12062 | p != method_parameters->end(); | |
f470da59 | 12063 | ++p, ++i) |
12064 | { | |
68883531 | 12065 | if (!p->name().empty()) |
f470da59 | 12066 | parameters->push_back(*p); |
12067 | else | |
12068 | { | |
12069 | char buf[20]; | |
12070 | snprintf(buf, sizeof buf, "$param%d", i); | |
12071 | parameters->push_back(Typed_identifier(buf, p->type(), | |
12072 | p->location())); | |
12073 | } | |
12074 | } | |
e440a328 | 12075 | } |
12076 | ||
12077 | const Typed_identifier_list* method_results = method_type->results(); | |
12078 | Typed_identifier_list* results; | |
12079 | if (method_results == NULL) | |
12080 | results = NULL; | |
12081 | else | |
12082 | { | |
12083 | results = new Typed_identifier_list(); | |
12084 | for (Typed_identifier_list::const_iterator p = method_results->begin(); | |
12085 | p != method_results->end(); | |
12086 | ++p) | |
12087 | results->push_back(*p); | |
12088 | } | |
12089 | ||
12090 | Function_type* fntype = Type::make_function_type(NULL, parameters, results, | |
12091 | location); | |
12092 | if (method_type->is_varargs()) | |
12093 | fntype->set_is_varargs(); | |
12094 | ||
12095 | // We generate methods which always takes a pointer to the receiver | |
12096 | // as their first argument. If this is for a pointer type, we can | |
12097 | // simply reuse the existing function. We use an internal hack to | |
12098 | // get the right type. | |
8381eda7 | 12099 | // FIXME: This optimization is disabled because it doesn't yet work |
12100 | // with function descriptors when the method expression is not | |
12101 | // directly called. | |
12102 | if (method != NULL && is_pointer && false) | |
e440a328 | 12103 | { |
12104 | Named_object* mno = (method->needs_stub_method() | |
12105 | ? method->stub_object() | |
12106 | : method->named_object()); | |
12107 | Expression* f = Expression::make_func_reference(mno, NULL, location); | |
12108 | f = Expression::make_cast(fntype, f, location); | |
12109 | Type_conversion_expression* tce = | |
12110 | static_cast<Type_conversion_expression*>(f); | |
12111 | tce->set_may_convert_function_types(); | |
12112 | return f; | |
12113 | } | |
12114 | ||
12115 | Named_object* no = gogo->start_function(Gogo::thunk_name(), fntype, false, | |
12116 | location); | |
12117 | ||
12118 | Named_object* vno = gogo->lookup(receiver_name, NULL); | |
c484d925 | 12119 | go_assert(vno != NULL); |
e440a328 | 12120 | Expression* ve = Expression::make_var_reference(vno, location); |
ab1468c3 | 12121 | Expression* bm; |
12122 | if (method != NULL) | |
12123 | bm = Type::bind_field_or_method(gogo, nt, ve, name, location); | |
12124 | else | |
12125 | bm = Expression::make_interface_field_reference(ve, name, location); | |
f690b0bb | 12126 | |
12127 | // Even though we found the method above, if it has an error type we | |
12128 | // may see an error here. | |
12129 | if (bm->is_error_expression()) | |
463fe805 | 12130 | { |
12131 | gogo->finish_function(location); | |
12132 | return bm; | |
12133 | } | |
e440a328 | 12134 | |
12135 | Expression_list* args; | |
f470da59 | 12136 | if (parameters->size() <= 1) |
e440a328 | 12137 | args = NULL; |
12138 | else | |
12139 | { | |
12140 | args = new Expression_list(); | |
f470da59 | 12141 | Typed_identifier_list::const_iterator p = parameters->begin(); |
12142 | ++p; | |
12143 | for (; p != parameters->end(); ++p) | |
e440a328 | 12144 | { |
12145 | vno = gogo->lookup(p->name(), NULL); | |
c484d925 | 12146 | go_assert(vno != NULL); |
e440a328 | 12147 | args->push_back(Expression::make_var_reference(vno, location)); |
12148 | } | |
12149 | } | |
12150 | ||
ceeb4318 | 12151 | gogo->start_block(location); |
12152 | ||
e440a328 | 12153 | Call_expression* call = Expression::make_call(bm, args, |
12154 | method_type->is_varargs(), | |
12155 | location); | |
12156 | ||
0afbb937 | 12157 | Statement* s = Statement::make_return_from_call(call, location); |
e440a328 | 12158 | gogo->add_statement(s); |
12159 | ||
ceeb4318 | 12160 | Block* b = gogo->finish_block(location); |
12161 | ||
12162 | gogo->add_block(b, location); | |
12163 | ||
12164 | // Lower the call in case there are multiple results. | |
12165 | gogo->lower_block(no, b); | |
a32698ee | 12166 | gogo->flatten_block(no, b); |
ceeb4318 | 12167 | |
e440a328 | 12168 | gogo->finish_function(location); |
12169 | ||
12170 | return Expression::make_func_reference(no, NULL, location); | |
12171 | } | |
12172 | ||
d751bb78 | 12173 | // Dump the ast for a selector expression. |
12174 | ||
12175 | void | |
12176 | Selector_expression::do_dump_expression(Ast_dump_context* ast_dump_context) | |
12177 | const | |
12178 | { | |
12179 | ast_dump_context->dump_expression(this->left_); | |
12180 | ast_dump_context->ostream() << "."; | |
12181 | ast_dump_context->ostream() << this->name_; | |
12182 | } | |
12183 | ||
e440a328 | 12184 | // Make a selector expression. |
12185 | ||
12186 | Expression* | |
12187 | Expression::make_selector(Expression* left, const std::string& name, | |
b13c66cd | 12188 | Location location) |
e440a328 | 12189 | { |
12190 | return new Selector_expression(left, name, location); | |
12191 | } | |
12192 | ||
da244e59 | 12193 | // Class Allocation_expression. |
e440a328 | 12194 | |
da244e59 | 12195 | int |
12196 | Allocation_expression::do_traverse(Traverse* traverse) | |
e440a328 | 12197 | { |
da244e59 | 12198 | return Type::traverse(this->type_, traverse); |
12199 | } | |
e440a328 | 12200 | |
da244e59 | 12201 | Type* |
12202 | Allocation_expression::do_type() | |
12203 | { | |
12204 | return Type::make_pointer_type(this->type_); | |
12205 | } | |
e440a328 | 12206 | |
da244e59 | 12207 | // Make a copy of an allocation expression. |
e440a328 | 12208 | |
da244e59 | 12209 | Expression* |
12210 | Allocation_expression::do_copy() | |
12211 | { | |
12212 | Allocation_expression* alloc = | |
12213 | new Allocation_expression(this->type_, this->location()); | |
12214 | if (this->allocate_on_stack_) | |
12215 | alloc->set_allocate_on_stack(); | |
12216 | return alloc; | |
12217 | } | |
e440a328 | 12218 | |
ea664253 | 12219 | // Return the backend representation for an allocation expression. |
e440a328 | 12220 | |
ea664253 | 12221 | Bexpression* |
12222 | Allocation_expression::do_get_backend(Translate_context* context) | |
e440a328 | 12223 | { |
2c809f8f | 12224 | Gogo* gogo = context->gogo(); |
12225 | Location loc = this->location(); | |
da244e59 | 12226 | |
45ff893b | 12227 | Node* n = Node::make_node(this); |
12228 | if (this->allocate_on_stack_ | |
12229 | || (n->encoding() & ESCAPE_MASK) == int(Node::ESCAPE_NONE)) | |
da244e59 | 12230 | { |
2a305b85 | 12231 | int64_t size; |
12232 | bool ok = this->type_->backend_type_size(gogo, &size); | |
12233 | if (!ok) | |
12234 | { | |
12235 | go_assert(saw_errors()); | |
12236 | return gogo->backend()->error_expression(); | |
12237 | } | |
d5d1c295 | 12238 | return gogo->backend()->stack_allocation_expression(size, loc); |
da244e59 | 12239 | } |
12240 | ||
2a305b85 | 12241 | Btype* btype = this->type_->get_backend(gogo); |
12242 | Bexpression* space = | |
ea664253 | 12243 | gogo->allocate_memory(this->type_, loc)->get_backend(context); |
d5d1c295 | 12244 | Btype* pbtype = gogo->backend()->pointer_type(btype); |
ea664253 | 12245 | return gogo->backend()->convert_expression(pbtype, space, loc); |
e440a328 | 12246 | } |
12247 | ||
d751bb78 | 12248 | // Dump ast representation for an allocation expression. |
12249 | ||
12250 | void | |
12251 | Allocation_expression::do_dump_expression(Ast_dump_context* ast_dump_context) | |
12252 | const | |
12253 | { | |
12254 | ast_dump_context->ostream() << "new("; | |
12255 | ast_dump_context->dump_type(this->type_); | |
12256 | ast_dump_context->ostream() << ")"; | |
12257 | } | |
12258 | ||
e440a328 | 12259 | // Make an allocation expression. |
12260 | ||
12261 | Expression* | |
b13c66cd | 12262 | Expression::make_allocation(Type* type, Location location) |
e440a328 | 12263 | { |
12264 | return new Allocation_expression(type, location); | |
12265 | } | |
12266 | ||
e32de7ba | 12267 | // Class Ordered_value_list. |
e440a328 | 12268 | |
12269 | int | |
e32de7ba | 12270 | Ordered_value_list::traverse_vals(Traverse* traverse) |
e440a328 | 12271 | { |
0c4f5a19 | 12272 | if (this->vals_ != NULL) |
12273 | { | |
12274 | if (this->traverse_order_ == NULL) | |
12275 | { | |
12276 | if (this->vals_->traverse(traverse) == TRAVERSE_EXIT) | |
12277 | return TRAVERSE_EXIT; | |
12278 | } | |
12279 | else | |
12280 | { | |
e32de7ba | 12281 | for (std::vector<unsigned long>::const_iterator p = |
12282 | this->traverse_order_->begin(); | |
0c4f5a19 | 12283 | p != this->traverse_order_->end(); |
12284 | ++p) | |
12285 | { | |
12286 | if (Expression::traverse(&this->vals_->at(*p), traverse) | |
12287 | == TRAVERSE_EXIT) | |
12288 | return TRAVERSE_EXIT; | |
12289 | } | |
12290 | } | |
12291 | } | |
e32de7ba | 12292 | return TRAVERSE_CONTINUE; |
12293 | } | |
12294 | ||
12295 | // Class Struct_construction_expression. | |
12296 | ||
12297 | // Traversal. | |
12298 | ||
12299 | int | |
12300 | Struct_construction_expression::do_traverse(Traverse* traverse) | |
12301 | { | |
12302 | if (this->traverse_vals(traverse) == TRAVERSE_EXIT) | |
12303 | return TRAVERSE_EXIT; | |
e440a328 | 12304 | if (Type::traverse(this->type_, traverse) == TRAVERSE_EXIT) |
12305 | return TRAVERSE_EXIT; | |
12306 | return TRAVERSE_CONTINUE; | |
12307 | } | |
12308 | ||
12309 | // Return whether this is a constant initializer. | |
12310 | ||
12311 | bool | |
12312 | Struct_construction_expression::is_constant_struct() const | |
12313 | { | |
e32de7ba | 12314 | if (this->vals() == NULL) |
e440a328 | 12315 | return true; |
e32de7ba | 12316 | for (Expression_list::const_iterator pv = this->vals()->begin(); |
12317 | pv != this->vals()->end(); | |
e440a328 | 12318 | ++pv) |
12319 | { | |
12320 | if (*pv != NULL | |
12321 | && !(*pv)->is_constant() | |
12322 | && (!(*pv)->is_composite_literal() | |
12323 | || (*pv)->is_nonconstant_composite_literal())) | |
12324 | return false; | |
12325 | } | |
12326 | ||
12327 | const Struct_field_list* fields = this->type_->struct_type()->fields(); | |
12328 | for (Struct_field_list::const_iterator pf = fields->begin(); | |
12329 | pf != fields->end(); | |
12330 | ++pf) | |
12331 | { | |
12332 | // There are no constant constructors for interfaces. | |
12333 | if (pf->type()->interface_type() != NULL) | |
12334 | return false; | |
12335 | } | |
12336 | ||
12337 | return true; | |
12338 | } | |
12339 | ||
3ae06f68 | 12340 | // Return whether this struct can be used as a constant initializer. |
f9ca30f9 | 12341 | |
12342 | bool | |
3ae06f68 | 12343 | Struct_construction_expression::do_is_static_initializer() const |
f9ca30f9 | 12344 | { |
e32de7ba | 12345 | if (this->vals() == NULL) |
f9ca30f9 | 12346 | return true; |
e32de7ba | 12347 | for (Expression_list::const_iterator pv = this->vals()->begin(); |
12348 | pv != this->vals()->end(); | |
f9ca30f9 | 12349 | ++pv) |
12350 | { | |
3ae06f68 | 12351 | if (*pv != NULL && !(*pv)->is_static_initializer()) |
f9ca30f9 | 12352 | return false; |
12353 | } | |
12354 | return true; | |
12355 | } | |
12356 | ||
e440a328 | 12357 | // Final type determination. |
12358 | ||
12359 | void | |
12360 | Struct_construction_expression::do_determine_type(const Type_context*) | |
12361 | { | |
e32de7ba | 12362 | if (this->vals() == NULL) |
e440a328 | 12363 | return; |
12364 | const Struct_field_list* fields = this->type_->struct_type()->fields(); | |
e32de7ba | 12365 | Expression_list::const_iterator pv = this->vals()->begin(); |
e440a328 | 12366 | for (Struct_field_list::const_iterator pf = fields->begin(); |
12367 | pf != fields->end(); | |
12368 | ++pf, ++pv) | |
12369 | { | |
e32de7ba | 12370 | if (pv == this->vals()->end()) |
e440a328 | 12371 | return; |
12372 | if (*pv != NULL) | |
12373 | { | |
12374 | Type_context subcontext(pf->type(), false); | |
12375 | (*pv)->determine_type(&subcontext); | |
12376 | } | |
12377 | } | |
a6cb4c0e | 12378 | // Extra values are an error we will report elsewhere; we still want |
12379 | // to determine the type to avoid knockon errors. | |
e32de7ba | 12380 | for (; pv != this->vals()->end(); ++pv) |
a6cb4c0e | 12381 | (*pv)->determine_type_no_context(); |
e440a328 | 12382 | } |
12383 | ||
12384 | // Check types. | |
12385 | ||
12386 | void | |
12387 | Struct_construction_expression::do_check_types(Gogo*) | |
12388 | { | |
e32de7ba | 12389 | if (this->vals() == NULL) |
e440a328 | 12390 | return; |
12391 | ||
12392 | Struct_type* st = this->type_->struct_type(); | |
e32de7ba | 12393 | if (this->vals()->size() > st->field_count()) |
e440a328 | 12394 | { |
12395 | this->report_error(_("too many expressions for struct")); | |
12396 | return; | |
12397 | } | |
12398 | ||
12399 | const Struct_field_list* fields = st->fields(); | |
e32de7ba | 12400 | Expression_list::const_iterator pv = this->vals()->begin(); |
e440a328 | 12401 | int i = 0; |
12402 | for (Struct_field_list::const_iterator pf = fields->begin(); | |
12403 | pf != fields->end(); | |
12404 | ++pf, ++pv, ++i) | |
12405 | { | |
e32de7ba | 12406 | if (pv == this->vals()->end()) |
e440a328 | 12407 | { |
12408 | this->report_error(_("too few expressions for struct")); | |
12409 | break; | |
12410 | } | |
12411 | ||
12412 | if (*pv == NULL) | |
12413 | continue; | |
12414 | ||
12415 | std::string reason; | |
12416 | if (!Type::are_assignable(pf->type(), (*pv)->type(), &reason)) | |
12417 | { | |
12418 | if (reason.empty()) | |
631d5788 | 12419 | go_error_at((*pv)->location(), |
12420 | "incompatible type for field %d in struct construction", | |
12421 | i + 1); | |
e440a328 | 12422 | else |
631d5788 | 12423 | go_error_at((*pv)->location(), |
12424 | ("incompatible type for field %d in " | |
12425 | "struct construction (%s)"), | |
12426 | i + 1, reason.c_str()); | |
e440a328 | 12427 | this->set_is_error(); |
12428 | } | |
12429 | } | |
e32de7ba | 12430 | go_assert(pv == this->vals()->end()); |
e440a328 | 12431 | } |
12432 | ||
8ba8cc87 | 12433 | // Flatten a struct construction expression. Store the values into |
12434 | // temporaries in case they need interface conversion. | |
12435 | ||
12436 | Expression* | |
12437 | Struct_construction_expression::do_flatten(Gogo*, Named_object*, | |
12438 | Statement_inserter* inserter) | |
12439 | { | |
e32de7ba | 12440 | if (this->vals() == NULL) |
8ba8cc87 | 12441 | return this; |
12442 | ||
12443 | // If this is a constant struct, we don't need temporaries. | |
12444 | if (this->is_constant_struct()) | |
12445 | return this; | |
12446 | ||
12447 | Location loc = this->location(); | |
e32de7ba | 12448 | for (Expression_list::iterator pv = this->vals()->begin(); |
12449 | pv != this->vals()->end(); | |
8ba8cc87 | 12450 | ++pv) |
12451 | { | |
12452 | if (*pv != NULL) | |
12453 | { | |
5bf8be8b | 12454 | if ((*pv)->is_error_expression() || (*pv)->type()->is_error_type()) |
12455 | { | |
12456 | go_assert(saw_errors()); | |
12457 | return Expression::make_error(loc); | |
12458 | } | |
8ba8cc87 | 12459 | if (!(*pv)->is_variable()) |
12460 | { | |
12461 | Temporary_statement* temp = | |
12462 | Statement::make_temporary(NULL, *pv, loc); | |
12463 | inserter->insert(temp); | |
12464 | *pv = Expression::make_temporary_reference(temp, loc); | |
12465 | } | |
12466 | } | |
12467 | } | |
12468 | return this; | |
12469 | } | |
12470 | ||
ea664253 | 12471 | // Return the backend representation for constructing a struct. |
e440a328 | 12472 | |
ea664253 | 12473 | Bexpression* |
12474 | Struct_construction_expression::do_get_backend(Translate_context* context) | |
e440a328 | 12475 | { |
12476 | Gogo* gogo = context->gogo(); | |
12477 | ||
2c809f8f | 12478 | Btype* btype = this->type_->get_backend(gogo); |
e32de7ba | 12479 | if (this->vals() == NULL) |
ea664253 | 12480 | return gogo->backend()->zero_expression(btype); |
e440a328 | 12481 | |
e440a328 | 12482 | const Struct_field_list* fields = this->type_->struct_type()->fields(); |
e32de7ba | 12483 | Expression_list::const_iterator pv = this->vals()->begin(); |
2c809f8f | 12484 | std::vector<Bexpression*> init; |
12485 | for (Struct_field_list::const_iterator pf = fields->begin(); | |
12486 | pf != fields->end(); | |
12487 | ++pf) | |
e440a328 | 12488 | { |
63697958 | 12489 | Btype* fbtype = pf->type()->get_backend(gogo); |
e32de7ba | 12490 | if (pv == this->vals()->end()) |
2c809f8f | 12491 | init.push_back(gogo->backend()->zero_expression(fbtype)); |
e440a328 | 12492 | else if (*pv == NULL) |
12493 | { | |
2c809f8f | 12494 | init.push_back(gogo->backend()->zero_expression(fbtype)); |
e440a328 | 12495 | ++pv; |
12496 | } | |
12497 | else | |
12498 | { | |
2c809f8f | 12499 | Expression* val = |
12500 | Expression::convert_for_assignment(gogo, pf->type(), | |
12501 | *pv, this->location()); | |
ea664253 | 12502 | init.push_back(val->get_backend(context)); |
e440a328 | 12503 | ++pv; |
12504 | } | |
e440a328 | 12505 | } |
ea664253 | 12506 | return gogo->backend()->constructor_expression(btype, init, this->location()); |
e440a328 | 12507 | } |
12508 | ||
12509 | // Export a struct construction. | |
12510 | ||
12511 | void | |
12512 | Struct_construction_expression::do_export(Export* exp) const | |
12513 | { | |
12514 | exp->write_c_string("convert("); | |
12515 | exp->write_type(this->type_); | |
e32de7ba | 12516 | for (Expression_list::const_iterator pv = this->vals()->begin(); |
12517 | pv != this->vals()->end(); | |
e440a328 | 12518 | ++pv) |
12519 | { | |
12520 | exp->write_c_string(", "); | |
12521 | if (*pv != NULL) | |
12522 | (*pv)->export_expression(exp); | |
12523 | } | |
12524 | exp->write_c_string(")"); | |
12525 | } | |
12526 | ||
d751bb78 | 12527 | // Dump ast representation of a struct construction expression. |
12528 | ||
12529 | void | |
12530 | Struct_construction_expression::do_dump_expression( | |
12531 | Ast_dump_context* ast_dump_context) const | |
12532 | { | |
d751bb78 | 12533 | ast_dump_context->dump_type(this->type_); |
12534 | ast_dump_context->ostream() << "{"; | |
e32de7ba | 12535 | ast_dump_context->dump_expression_list(this->vals()); |
d751bb78 | 12536 | ast_dump_context->ostream() << "}"; |
12537 | } | |
12538 | ||
e440a328 | 12539 | // Make a struct composite literal. This used by the thunk code. |
12540 | ||
12541 | Expression* | |
12542 | Expression::make_struct_composite_literal(Type* type, Expression_list* vals, | |
b13c66cd | 12543 | Location location) |
e440a328 | 12544 | { |
c484d925 | 12545 | go_assert(type->struct_type() != NULL); |
e440a328 | 12546 | return new Struct_construction_expression(type, vals, location); |
12547 | } | |
12548 | ||
da244e59 | 12549 | // Class Array_construction_expression. |
e440a328 | 12550 | |
12551 | // Traversal. | |
12552 | ||
12553 | int | |
12554 | Array_construction_expression::do_traverse(Traverse* traverse) | |
12555 | { | |
e32de7ba | 12556 | if (this->traverse_vals(traverse) == TRAVERSE_EXIT) |
e440a328 | 12557 | return TRAVERSE_EXIT; |
12558 | if (Type::traverse(this->type_, traverse) == TRAVERSE_EXIT) | |
12559 | return TRAVERSE_EXIT; | |
12560 | return TRAVERSE_CONTINUE; | |
12561 | } | |
12562 | ||
12563 | // Return whether this is a constant initializer. | |
12564 | ||
12565 | bool | |
12566 | Array_construction_expression::is_constant_array() const | |
12567 | { | |
e32de7ba | 12568 | if (this->vals() == NULL) |
e440a328 | 12569 | return true; |
12570 | ||
12571 | // There are no constant constructors for interfaces. | |
12572 | if (this->type_->array_type()->element_type()->interface_type() != NULL) | |
12573 | return false; | |
12574 | ||
e32de7ba | 12575 | for (Expression_list::const_iterator pv = this->vals()->begin(); |
12576 | pv != this->vals()->end(); | |
e440a328 | 12577 | ++pv) |
12578 | { | |
12579 | if (*pv != NULL | |
12580 | && !(*pv)->is_constant() | |
12581 | && (!(*pv)->is_composite_literal() | |
12582 | || (*pv)->is_nonconstant_composite_literal())) | |
12583 | return false; | |
12584 | } | |
12585 | return true; | |
12586 | } | |
12587 | ||
3ae06f68 | 12588 | // Return whether this can be used a constant initializer. |
f9ca30f9 | 12589 | |
12590 | bool | |
3ae06f68 | 12591 | Array_construction_expression::do_is_static_initializer() const |
f9ca30f9 | 12592 | { |
e32de7ba | 12593 | if (this->vals() == NULL) |
f9ca30f9 | 12594 | return true; |
e32de7ba | 12595 | for (Expression_list::const_iterator pv = this->vals()->begin(); |
12596 | pv != this->vals()->end(); | |
f9ca30f9 | 12597 | ++pv) |
12598 | { | |
3ae06f68 | 12599 | if (*pv != NULL && !(*pv)->is_static_initializer()) |
f9ca30f9 | 12600 | return false; |
12601 | } | |
12602 | return true; | |
12603 | } | |
12604 | ||
e440a328 | 12605 | // Final type determination. |
12606 | ||
12607 | void | |
12608 | Array_construction_expression::do_determine_type(const Type_context*) | |
12609 | { | |
e32de7ba | 12610 | if (this->vals() == NULL) |
e440a328 | 12611 | return; |
12612 | Type_context subcontext(this->type_->array_type()->element_type(), false); | |
e32de7ba | 12613 | for (Expression_list::const_iterator pv = this->vals()->begin(); |
12614 | pv != this->vals()->end(); | |
e440a328 | 12615 | ++pv) |
12616 | { | |
12617 | if (*pv != NULL) | |
12618 | (*pv)->determine_type(&subcontext); | |
12619 | } | |
12620 | } | |
12621 | ||
12622 | // Check types. | |
12623 | ||
12624 | void | |
12625 | Array_construction_expression::do_check_types(Gogo*) | |
12626 | { | |
e32de7ba | 12627 | if (this->vals() == NULL) |
e440a328 | 12628 | return; |
12629 | ||
12630 | Array_type* at = this->type_->array_type(); | |
12631 | int i = 0; | |
12632 | Type* element_type = at->element_type(); | |
e32de7ba | 12633 | for (Expression_list::const_iterator pv = this->vals()->begin(); |
12634 | pv != this->vals()->end(); | |
e440a328 | 12635 | ++pv, ++i) |
12636 | { | |
12637 | if (*pv != NULL | |
12638 | && !Type::are_assignable(element_type, (*pv)->type(), NULL)) | |
12639 | { | |
631d5788 | 12640 | go_error_at((*pv)->location(), |
12641 | "incompatible type for element %d in composite literal", | |
12642 | i + 1); | |
e440a328 | 12643 | this->set_is_error(); |
12644 | } | |
12645 | } | |
e440a328 | 12646 | } |
12647 | ||
8ba8cc87 | 12648 | // Flatten an array construction expression. Store the values into |
12649 | // temporaries in case they need interface conversion. | |
12650 | ||
12651 | Expression* | |
12652 | Array_construction_expression::do_flatten(Gogo*, Named_object*, | |
12653 | Statement_inserter* inserter) | |
12654 | { | |
e32de7ba | 12655 | if (this->vals() == NULL) |
8ba8cc87 | 12656 | return this; |
12657 | ||
12658 | // If this is a constant array, we don't need temporaries. | |
12659 | if (this->is_constant_array()) | |
12660 | return this; | |
12661 | ||
12662 | Location loc = this->location(); | |
e32de7ba | 12663 | for (Expression_list::iterator pv = this->vals()->begin(); |
12664 | pv != this->vals()->end(); | |
8ba8cc87 | 12665 | ++pv) |
12666 | { | |
12667 | if (*pv != NULL) | |
12668 | { | |
5bf8be8b | 12669 | if ((*pv)->is_error_expression() || (*pv)->type()->is_error_type()) |
12670 | { | |
12671 | go_assert(saw_errors()); | |
12672 | return Expression::make_error(loc); | |
12673 | } | |
8ba8cc87 | 12674 | if (!(*pv)->is_variable()) |
12675 | { | |
12676 | Temporary_statement* temp = | |
12677 | Statement::make_temporary(NULL, *pv, loc); | |
12678 | inserter->insert(temp); | |
12679 | *pv = Expression::make_temporary_reference(temp, loc); | |
12680 | } | |
12681 | } | |
12682 | } | |
12683 | return this; | |
12684 | } | |
12685 | ||
2c809f8f | 12686 | // Get a constructor expression for the array values. |
e440a328 | 12687 | |
2c809f8f | 12688 | Bexpression* |
12689 | Array_construction_expression::get_constructor(Translate_context* context, | |
12690 | Btype* array_btype) | |
e440a328 | 12691 | { |
e440a328 | 12692 | Type* element_type = this->type_->array_type()->element_type(); |
2c809f8f | 12693 | |
12694 | std::vector<unsigned long> indexes; | |
12695 | std::vector<Bexpression*> vals; | |
12696 | Gogo* gogo = context->gogo(); | |
e32de7ba | 12697 | if (this->vals() != NULL) |
e440a328 | 12698 | { |
12699 | size_t i = 0; | |
ffe743ca | 12700 | std::vector<unsigned long>::const_iterator pi; |
12701 | if (this->indexes_ != NULL) | |
12702 | pi = this->indexes_->begin(); | |
e32de7ba | 12703 | for (Expression_list::const_iterator pv = this->vals()->begin(); |
12704 | pv != this->vals()->end(); | |
e440a328 | 12705 | ++pv, ++i) |
12706 | { | |
ffe743ca | 12707 | if (this->indexes_ != NULL) |
12708 | go_assert(pi != this->indexes_->end()); | |
ffe743ca | 12709 | |
12710 | if (this->indexes_ == NULL) | |
2c809f8f | 12711 | indexes.push_back(i); |
ffe743ca | 12712 | else |
2c809f8f | 12713 | indexes.push_back(*pi); |
e440a328 | 12714 | if (*pv == NULL) |
63697958 | 12715 | { |
63697958 | 12716 | Btype* ebtype = element_type->get_backend(gogo); |
12717 | Bexpression *zv = gogo->backend()->zero_expression(ebtype); | |
2c809f8f | 12718 | vals.push_back(zv); |
63697958 | 12719 | } |
e440a328 | 12720 | else |
12721 | { | |
2c809f8f | 12722 | Expression* val_expr = |
12723 | Expression::convert_for_assignment(gogo, element_type, *pv, | |
12724 | this->location()); | |
ea664253 | 12725 | vals.push_back(val_expr->get_backend(context)); |
e440a328 | 12726 | } |
ffe743ca | 12727 | if (this->indexes_ != NULL) |
12728 | ++pi; | |
e440a328 | 12729 | } |
ffe743ca | 12730 | if (this->indexes_ != NULL) |
12731 | go_assert(pi == this->indexes_->end()); | |
e440a328 | 12732 | } |
2c809f8f | 12733 | return gogo->backend()->array_constructor_expression(array_btype, indexes, |
12734 | vals, this->location()); | |
e440a328 | 12735 | } |
12736 | ||
12737 | // Export an array construction. | |
12738 | ||
12739 | void | |
12740 | Array_construction_expression::do_export(Export* exp) const | |
12741 | { | |
12742 | exp->write_c_string("convert("); | |
12743 | exp->write_type(this->type_); | |
e32de7ba | 12744 | if (this->vals() != NULL) |
e440a328 | 12745 | { |
ffe743ca | 12746 | std::vector<unsigned long>::const_iterator pi; |
12747 | if (this->indexes_ != NULL) | |
12748 | pi = this->indexes_->begin(); | |
e32de7ba | 12749 | for (Expression_list::const_iterator pv = this->vals()->begin(); |
12750 | pv != this->vals()->end(); | |
e440a328 | 12751 | ++pv) |
12752 | { | |
12753 | exp->write_c_string(", "); | |
ffe743ca | 12754 | |
12755 | if (this->indexes_ != NULL) | |
12756 | { | |
12757 | char buf[100]; | |
12758 | snprintf(buf, sizeof buf, "%lu", *pi); | |
12759 | exp->write_c_string(buf); | |
12760 | exp->write_c_string(":"); | |
12761 | } | |
12762 | ||
e440a328 | 12763 | if (*pv != NULL) |
12764 | (*pv)->export_expression(exp); | |
ffe743ca | 12765 | |
12766 | if (this->indexes_ != NULL) | |
12767 | ++pi; | |
e440a328 | 12768 | } |
12769 | } | |
12770 | exp->write_c_string(")"); | |
12771 | } | |
12772 | ||
0e9a2e72 | 12773 | // Dump ast representation of an array construction expression. |
d751bb78 | 12774 | |
12775 | void | |
12776 | Array_construction_expression::do_dump_expression( | |
12777 | Ast_dump_context* ast_dump_context) const | |
12778 | { | |
ffe743ca | 12779 | Expression* length = this->type_->array_type()->length(); |
8b1c301d | 12780 | |
12781 | ast_dump_context->ostream() << "[" ; | |
12782 | if (length != NULL) | |
12783 | { | |
12784 | ast_dump_context->dump_expression(length); | |
12785 | } | |
12786 | ast_dump_context->ostream() << "]" ; | |
d751bb78 | 12787 | ast_dump_context->dump_type(this->type_); |
0e9a2e72 | 12788 | this->dump_slice_storage_expression(ast_dump_context); |
d751bb78 | 12789 | ast_dump_context->ostream() << "{" ; |
ffe743ca | 12790 | if (this->indexes_ == NULL) |
e32de7ba | 12791 | ast_dump_context->dump_expression_list(this->vals()); |
ffe743ca | 12792 | else |
12793 | { | |
e32de7ba | 12794 | Expression_list::const_iterator pv = this->vals()->begin(); |
ffe743ca | 12795 | for (std::vector<unsigned long>::const_iterator pi = |
12796 | this->indexes_->begin(); | |
12797 | pi != this->indexes_->end(); | |
12798 | ++pi, ++pv) | |
12799 | { | |
12800 | if (pi != this->indexes_->begin()) | |
12801 | ast_dump_context->ostream() << ", "; | |
12802 | ast_dump_context->ostream() << *pi << ':'; | |
12803 | ast_dump_context->dump_expression(*pv); | |
12804 | } | |
12805 | } | |
d751bb78 | 12806 | ast_dump_context->ostream() << "}" ; |
12807 | ||
12808 | } | |
12809 | ||
da244e59 | 12810 | // Class Fixed_array_construction_expression. |
e440a328 | 12811 | |
da244e59 | 12812 | Fixed_array_construction_expression::Fixed_array_construction_expression( |
12813 | Type* type, const std::vector<unsigned long>* indexes, | |
12814 | Expression_list* vals, Location location) | |
12815 | : Array_construction_expression(EXPRESSION_FIXED_ARRAY_CONSTRUCTION, | |
12816 | type, indexes, vals, location) | |
12817 | { go_assert(type->array_type() != NULL && !type->is_slice_type()); } | |
e440a328 | 12818 | |
ea664253 | 12819 | // Return the backend representation for constructing a fixed array. |
e440a328 | 12820 | |
ea664253 | 12821 | Bexpression* |
12822 | Fixed_array_construction_expression::do_get_backend(Translate_context* context) | |
e440a328 | 12823 | { |
9f0e0513 | 12824 | Type* type = this->type(); |
12825 | Btype* btype = type->get_backend(context->gogo()); | |
ea664253 | 12826 | return this->get_constructor(context, btype); |
e440a328 | 12827 | } |
12828 | ||
76f85fd6 | 12829 | Expression* |
12830 | Expression::make_array_composite_literal(Type* type, Expression_list* vals, | |
12831 | Location location) | |
12832 | { | |
12833 | go_assert(type->array_type() != NULL && !type->is_slice_type()); | |
12834 | return new Fixed_array_construction_expression(type, NULL, vals, location); | |
12835 | } | |
12836 | ||
da244e59 | 12837 | // Class Slice_construction_expression. |
e440a328 | 12838 | |
da244e59 | 12839 | Slice_construction_expression::Slice_construction_expression( |
12840 | Type* type, const std::vector<unsigned long>* indexes, | |
12841 | Expression_list* vals, Location location) | |
12842 | : Array_construction_expression(EXPRESSION_SLICE_CONSTRUCTION, | |
12843 | type, indexes, vals, location), | |
0e9a2e72 | 12844 | valtype_(NULL), array_val_(NULL), slice_storage_(NULL), |
12845 | storage_escapes_(true) | |
e440a328 | 12846 | { |
da244e59 | 12847 | go_assert(type->is_slice_type()); |
23d77f91 | 12848 | |
da244e59 | 12849 | unsigned long lenval; |
12850 | Expression* length; | |
12851 | if (vals == NULL || vals->empty()) | |
12852 | lenval = 0; | |
12853 | else | |
12854 | { | |
12855 | if (this->indexes() == NULL) | |
12856 | lenval = vals->size(); | |
12857 | else | |
12858 | lenval = indexes->back() + 1; | |
12859 | } | |
12860 | Type* int_type = Type::lookup_integer_type("int"); | |
12861 | length = Expression::make_integer_ul(lenval, int_type, location); | |
12862 | Type* element_type = type->array_type()->element_type(); | |
12863 | this->valtype_ = Type::make_array_type(element_type, length); | |
12864 | } | |
e440a328 | 12865 | |
23d77f91 | 12866 | // Traversal. |
12867 | ||
12868 | int | |
12869 | Slice_construction_expression::do_traverse(Traverse* traverse) | |
12870 | { | |
12871 | if (this->Array_construction_expression::do_traverse(traverse) | |
12872 | == TRAVERSE_EXIT) | |
12873 | return TRAVERSE_EXIT; | |
12874 | if (Type::traverse(this->valtype_, traverse) == TRAVERSE_EXIT) | |
12875 | return TRAVERSE_EXIT; | |
0e9a2e72 | 12876 | if (this->array_val_ != NULL |
12877 | && Expression::traverse(&this->array_val_, traverse) == TRAVERSE_EXIT) | |
12878 | return TRAVERSE_EXIT; | |
12879 | if (this->slice_storage_ != NULL | |
12880 | && Expression::traverse(&this->slice_storage_, traverse) == TRAVERSE_EXIT) | |
12881 | return TRAVERSE_EXIT; | |
23d77f91 | 12882 | return TRAVERSE_CONTINUE; |
12883 | } | |
12884 | ||
0e9a2e72 | 12885 | // Helper routine to create fixed array value underlying the slice literal. |
12886 | // May be called during flattening, or later during do_get_backend(). | |
e440a328 | 12887 | |
0e9a2e72 | 12888 | Expression* |
12889 | Slice_construction_expression::create_array_val() | |
e440a328 | 12890 | { |
f9c68f17 | 12891 | Array_type* array_type = this->type()->array_type(); |
12892 | if (array_type == NULL) | |
12893 | { | |
c484d925 | 12894 | go_assert(this->type()->is_error()); |
0e9a2e72 | 12895 | return NULL; |
f9c68f17 | 12896 | } |
12897 | ||
f23d7786 | 12898 | Location loc = this->location(); |
23d77f91 | 12899 | go_assert(this->valtype_ != NULL); |
3d60812e | 12900 | |
f23d7786 | 12901 | Expression_list* vals = this->vals(); |
e440a328 | 12902 | if (this->vals() == NULL || this->vals()->empty()) |
12903 | { | |
f23d7786 | 12904 | // We need to create a unique value for the empty array literal. |
12905 | vals = new Expression_list; | |
12906 | vals->push_back(NULL); | |
e440a328 | 12907 | } |
0e9a2e72 | 12908 | return new Fixed_array_construction_expression( |
12909 | this->valtype_, this->indexes(), vals, loc); | |
12910 | } | |
12911 | ||
12912 | // If we're previous established that the slice storage does not | |
12913 | // escape, then create a separate array temp val here for it. We | |
12914 | // need to do this as part of flattening so as to be able to insert | |
12915 | // the new temp statement. | |
12916 | ||
12917 | Expression* | |
12918 | Slice_construction_expression::do_flatten(Gogo* gogo, Named_object* no, | |
12919 | Statement_inserter* inserter) | |
12920 | { | |
12921 | if (this->type()->array_type() == NULL) | |
12922 | return NULL; | |
12923 | ||
12924 | // Base class flattening first | |
12925 | this->Array_construction_expression::do_flatten(gogo, no, inserter); | |
12926 | ||
12927 | // Create an stack-allocated storage temp if storage won't escape | |
12928 | if (!this->storage_escapes_) | |
12929 | { | |
12930 | Location loc = this->location(); | |
12931 | this->array_val_ = create_array_val(); | |
12932 | go_assert(this->array_val_); | |
12933 | Temporary_statement* temp = | |
12934 | Statement::make_temporary(this->valtype_, this->array_val_, loc); | |
12935 | inserter->insert(temp); | |
12936 | this->slice_storage_ = Expression::make_temporary_reference(temp, loc); | |
12937 | } | |
12938 | return this; | |
12939 | } | |
12940 | ||
12941 | // When dumping a slice construction expression that has an explicit | |
12942 | // storeage temp, emit the temp here (if we don't do this the storage | |
12943 | // temp appears unused in the AST dump). | |
12944 | ||
12945 | void | |
12946 | Slice_construction_expression:: | |
12947 | dump_slice_storage_expression(Ast_dump_context* ast_dump_context) const | |
12948 | { | |
12949 | if (this->slice_storage_ == NULL) | |
12950 | return; | |
12951 | ast_dump_context->ostream() << "storage=" ; | |
12952 | ast_dump_context->dump_expression(this->slice_storage_); | |
12953 | } | |
12954 | ||
12955 | // Return the backend representation for constructing a slice. | |
12956 | ||
12957 | Bexpression* | |
12958 | Slice_construction_expression::do_get_backend(Translate_context* context) | |
12959 | { | |
12960 | if (this->array_val_ == NULL) | |
12961 | this->array_val_ = create_array_val(); | |
12962 | if (this->array_val_ == NULL) | |
12963 | { | |
12964 | go_assert(this->type()->is_error()); | |
12965 | return context->backend()->error_expression(); | |
12966 | } | |
12967 | ||
12968 | Location loc = this->location(); | |
e440a328 | 12969 | |
3ae06f68 | 12970 | bool is_static_initializer = this->array_val_->is_static_initializer(); |
d8829beb | 12971 | |
12972 | // We have to copy the initial values into heap memory if we are in | |
3ae06f68 | 12973 | // a function or if the values are not constants. |
12974 | bool copy_to_heap = context->function() != NULL || !is_static_initializer; | |
e440a328 | 12975 | |
f23d7786 | 12976 | Expression* space; |
0e9a2e72 | 12977 | |
12978 | if (this->slice_storage_ != NULL) | |
12979 | { | |
12980 | go_assert(!this->storage_escapes_); | |
12981 | space = Expression::make_unary(OPERATOR_AND, this->slice_storage_, loc); | |
12982 | } | |
12983 | else if (!copy_to_heap) | |
e440a328 | 12984 | { |
f23d7786 | 12985 | // The initializer will only run once. |
0e9a2e72 | 12986 | space = Expression::make_unary(OPERATOR_AND, this->array_val_, loc); |
f23d7786 | 12987 | space->unary_expression()->set_is_slice_init(); |
e440a328 | 12988 | } |
12989 | else | |
45ff893b | 12990 | { |
0e9a2e72 | 12991 | space = Expression::make_heap_expression(this->array_val_, loc); |
45ff893b | 12992 | Node* n = Node::make_node(this); |
12993 | if ((n->encoding() & ESCAPE_MASK) == int(Node::ESCAPE_NONE)) | |
12994 | { | |
12995 | n = Node::make_node(space); | |
12996 | n->set_encoding(Node::ESCAPE_NONE); | |
12997 | } | |
12998 | } | |
e440a328 | 12999 | |
2c809f8f | 13000 | // Build a constructor for the slice. |
f23d7786 | 13001 | Expression* len = this->valtype_->array_type()->length(); |
13002 | Expression* slice_val = | |
13003 | Expression::make_slice_value(this->type(), space, len, len, loc); | |
ea664253 | 13004 | return slice_val->get_backend(context); |
e440a328 | 13005 | } |
13006 | ||
13007 | // Make a slice composite literal. This is used by the type | |
13008 | // descriptor code. | |
13009 | ||
0e9a2e72 | 13010 | Slice_construction_expression* |
e440a328 | 13011 | Expression::make_slice_composite_literal(Type* type, Expression_list* vals, |
b13c66cd | 13012 | Location location) |
e440a328 | 13013 | { |
411eb89e | 13014 | go_assert(type->is_slice_type()); |
2c809f8f | 13015 | return new Slice_construction_expression(type, NULL, vals, location); |
e440a328 | 13016 | } |
13017 | ||
da244e59 | 13018 | // Class Map_construction_expression. |
e440a328 | 13019 | |
13020 | // Traversal. | |
13021 | ||
13022 | int | |
13023 | Map_construction_expression::do_traverse(Traverse* traverse) | |
13024 | { | |
13025 | if (this->vals_ != NULL | |
13026 | && this->vals_->traverse(traverse) == TRAVERSE_EXIT) | |
13027 | return TRAVERSE_EXIT; | |
13028 | if (Type::traverse(this->type_, traverse) == TRAVERSE_EXIT) | |
13029 | return TRAVERSE_EXIT; | |
13030 | return TRAVERSE_CONTINUE; | |
13031 | } | |
13032 | ||
2c809f8f | 13033 | // Flatten constructor initializer into a temporary variable since |
13034 | // we need to take its address for __go_construct_map. | |
13035 | ||
13036 | Expression* | |
13037 | Map_construction_expression::do_flatten(Gogo* gogo, Named_object*, | |
13038 | Statement_inserter* inserter) | |
13039 | { | |
13040 | if (!this->is_error_expression() | |
13041 | && this->vals_ != NULL | |
13042 | && !this->vals_->empty() | |
13043 | && this->constructor_temp_ == NULL) | |
13044 | { | |
13045 | Map_type* mt = this->type_->map_type(); | |
13046 | Type* key_type = mt->key_type(); | |
13047 | Type* val_type = mt->val_type(); | |
13048 | this->element_type_ = Type::make_builtin_struct_type(2, | |
13049 | "__key", key_type, | |
13050 | "__val", val_type); | |
13051 | ||
13052 | Expression_list* value_pairs = new Expression_list(); | |
13053 | Location loc = this->location(); | |
13054 | ||
13055 | size_t i = 0; | |
13056 | for (Expression_list::const_iterator pv = this->vals_->begin(); | |
13057 | pv != this->vals_->end(); | |
13058 | ++pv, ++i) | |
13059 | { | |
13060 | Expression_list* key_value_pair = new Expression_list(); | |
91c0fd76 | 13061 | Expression* key = *pv; |
5bf8be8b | 13062 | if (key->is_error_expression() || key->type()->is_error_type()) |
13063 | { | |
13064 | go_assert(saw_errors()); | |
13065 | return Expression::make_error(loc); | |
13066 | } | |
91c0fd76 | 13067 | if (key->type()->interface_type() != NULL && !key->is_variable()) |
13068 | { | |
13069 | Temporary_statement* temp = | |
13070 | Statement::make_temporary(NULL, key, loc); | |
13071 | inserter->insert(temp); | |
13072 | key = Expression::make_temporary_reference(temp, loc); | |
13073 | } | |
13074 | key = Expression::convert_for_assignment(gogo, key_type, key, loc); | |
2c809f8f | 13075 | |
13076 | ++pv; | |
91c0fd76 | 13077 | Expression* val = *pv; |
5bf8be8b | 13078 | if (val->is_error_expression() || val->type()->is_error_type()) |
13079 | { | |
13080 | go_assert(saw_errors()); | |
13081 | return Expression::make_error(loc); | |
13082 | } | |
91c0fd76 | 13083 | if (val->type()->interface_type() != NULL && !val->is_variable()) |
13084 | { | |
13085 | Temporary_statement* temp = | |
13086 | Statement::make_temporary(NULL, val, loc); | |
13087 | inserter->insert(temp); | |
13088 | val = Expression::make_temporary_reference(temp, loc); | |
13089 | } | |
13090 | val = Expression::convert_for_assignment(gogo, val_type, val, loc); | |
2c809f8f | 13091 | |
13092 | key_value_pair->push_back(key); | |
13093 | key_value_pair->push_back(val); | |
13094 | value_pairs->push_back( | |
13095 | Expression::make_struct_composite_literal(this->element_type_, | |
13096 | key_value_pair, loc)); | |
13097 | } | |
13098 | ||
e67508fa | 13099 | Expression* element_count = Expression::make_integer_ul(i, NULL, loc); |
2c809f8f | 13100 | Type* ctor_type = |
13101 | Type::make_array_type(this->element_type_, element_count); | |
13102 | Expression* constructor = | |
13103 | new Fixed_array_construction_expression(ctor_type, NULL, | |
13104 | value_pairs, loc); | |
13105 | ||
13106 | this->constructor_temp_ = | |
13107 | Statement::make_temporary(NULL, constructor, loc); | |
13108 | constructor->issue_nil_check(); | |
13109 | this->constructor_temp_->set_is_address_taken(); | |
13110 | inserter->insert(this->constructor_temp_); | |
13111 | } | |
13112 | ||
13113 | return this; | |
13114 | } | |
13115 | ||
e440a328 | 13116 | // Final type determination. |
13117 | ||
13118 | void | |
13119 | Map_construction_expression::do_determine_type(const Type_context*) | |
13120 | { | |
13121 | if (this->vals_ == NULL) | |
13122 | return; | |
13123 | ||
13124 | Map_type* mt = this->type_->map_type(); | |
13125 | Type_context key_context(mt->key_type(), false); | |
13126 | Type_context val_context(mt->val_type(), false); | |
13127 | for (Expression_list::const_iterator pv = this->vals_->begin(); | |
13128 | pv != this->vals_->end(); | |
13129 | ++pv) | |
13130 | { | |
13131 | (*pv)->determine_type(&key_context); | |
13132 | ++pv; | |
13133 | (*pv)->determine_type(&val_context); | |
13134 | } | |
13135 | } | |
13136 | ||
13137 | // Check types. | |
13138 | ||
13139 | void | |
13140 | Map_construction_expression::do_check_types(Gogo*) | |
13141 | { | |
13142 | if (this->vals_ == NULL) | |
13143 | return; | |
13144 | ||
13145 | Map_type* mt = this->type_->map_type(); | |
13146 | int i = 0; | |
13147 | Type* key_type = mt->key_type(); | |
13148 | Type* val_type = mt->val_type(); | |
13149 | for (Expression_list::const_iterator pv = this->vals_->begin(); | |
13150 | pv != this->vals_->end(); | |
13151 | ++pv, ++i) | |
13152 | { | |
13153 | if (!Type::are_assignable(key_type, (*pv)->type(), NULL)) | |
13154 | { | |
631d5788 | 13155 | go_error_at((*pv)->location(), |
13156 | "incompatible type for element %d key in map construction", | |
13157 | i + 1); | |
e440a328 | 13158 | this->set_is_error(); |
13159 | } | |
13160 | ++pv; | |
13161 | if (!Type::are_assignable(val_type, (*pv)->type(), NULL)) | |
13162 | { | |
631d5788 | 13163 | go_error_at((*pv)->location(), |
13164 | ("incompatible type for element %d value " | |
13165 | "in map construction"), | |
e440a328 | 13166 | i + 1); |
13167 | this->set_is_error(); | |
13168 | } | |
13169 | } | |
13170 | } | |
13171 | ||
ea664253 | 13172 | // Return the backend representation for constructing a map. |
e440a328 | 13173 | |
ea664253 | 13174 | Bexpression* |
13175 | Map_construction_expression::do_get_backend(Translate_context* context) | |
e440a328 | 13176 | { |
2c809f8f | 13177 | if (this->is_error_expression()) |
ea664253 | 13178 | return context->backend()->error_expression(); |
2c809f8f | 13179 | Location loc = this->location(); |
e440a328 | 13180 | |
e440a328 | 13181 | size_t i = 0; |
2c809f8f | 13182 | Expression* ventries; |
e440a328 | 13183 | if (this->vals_ == NULL || this->vals_->empty()) |
2c809f8f | 13184 | ventries = Expression::make_nil(loc); |
e440a328 | 13185 | else |
13186 | { | |
2c809f8f | 13187 | go_assert(this->constructor_temp_ != NULL); |
13188 | i = this->vals_->size() / 2; | |
e440a328 | 13189 | |
2c809f8f | 13190 | Expression* ctor_ref = |
13191 | Expression::make_temporary_reference(this->constructor_temp_, loc); | |
13192 | ventries = Expression::make_unary(OPERATOR_AND, ctor_ref, loc); | |
13193 | } | |
e440a328 | 13194 | |
2c809f8f | 13195 | Map_type* mt = this->type_->map_type(); |
13196 | if (this->element_type_ == NULL) | |
13197 | this->element_type_ = | |
13198 | Type::make_builtin_struct_type(2, | |
13199 | "__key", mt->key_type(), | |
13200 | "__val", mt->val_type()); | |
0d5530d9 | 13201 | Expression* descriptor = Expression::make_type_descriptor(mt, loc); |
2c809f8f | 13202 | |
13203 | Type* uintptr_t = Type::lookup_integer_type("uintptr"); | |
e67508fa | 13204 | Expression* count = Expression::make_integer_ul(i, uintptr_t, loc); |
2c809f8f | 13205 | |
13206 | Expression* entry_size = | |
13207 | Expression::make_type_info(this->element_type_, TYPE_INFO_SIZE); | |
13208 | ||
13209 | unsigned int field_index; | |
13210 | const Struct_field* valfield = | |
13211 | this->element_type_->find_local_field("__val", &field_index); | |
13212 | Expression* val_offset = | |
13213 | Expression::make_struct_field_offset(this->element_type_, valfield); | |
2c809f8f | 13214 | |
13215 | Expression* map_ctor = | |
0d5530d9 | 13216 | Runtime::make_call(Runtime::CONSTRUCT_MAP, loc, 5, descriptor, count, |
13217 | entry_size, val_offset, ventries); | |
ea664253 | 13218 | return map_ctor->get_backend(context); |
2c809f8f | 13219 | } |
e440a328 | 13220 | |
2c809f8f | 13221 | // Export an array construction. |
e440a328 | 13222 | |
2c809f8f | 13223 | void |
13224 | Map_construction_expression::do_export(Export* exp) const | |
13225 | { | |
13226 | exp->write_c_string("convert("); | |
13227 | exp->write_type(this->type_); | |
13228 | for (Expression_list::const_iterator pv = this->vals_->begin(); | |
13229 | pv != this->vals_->end(); | |
13230 | ++pv) | |
13231 | { | |
13232 | exp->write_c_string(", "); | |
13233 | (*pv)->export_expression(exp); | |
13234 | } | |
13235 | exp->write_c_string(")"); | |
13236 | } | |
e440a328 | 13237 | |
2c809f8f | 13238 | // Dump ast representation for a map construction expression. |
d751bb78 | 13239 | |
13240 | void | |
13241 | Map_construction_expression::do_dump_expression( | |
13242 | Ast_dump_context* ast_dump_context) const | |
13243 | { | |
d751bb78 | 13244 | ast_dump_context->ostream() << "{" ; |
8b1c301d | 13245 | ast_dump_context->dump_expression_list(this->vals_, true); |
d751bb78 | 13246 | ast_dump_context->ostream() << "}"; |
13247 | } | |
13248 | ||
7795ac51 | 13249 | // Class Composite_literal_expression. |
e440a328 | 13250 | |
13251 | // Traversal. | |
13252 | ||
13253 | int | |
13254 | Composite_literal_expression::do_traverse(Traverse* traverse) | |
13255 | { | |
dbffccfc | 13256 | if (Type::traverse(this->type_, traverse) == TRAVERSE_EXIT) |
e440a328 | 13257 | return TRAVERSE_EXIT; |
dbffccfc | 13258 | |
13259 | // If this is a struct composite literal with keys, then the keys | |
13260 | // are field names, not expressions. We don't want to traverse them | |
13261 | // in that case. If we do, we can give an erroneous error "variable | |
13262 | // initializer refers to itself." See bug482.go in the testsuite. | |
13263 | if (this->has_keys_ && this->vals_ != NULL) | |
13264 | { | |
13265 | // The type may not be resolvable at this point. | |
13266 | Type* type = this->type_; | |
a01f2481 | 13267 | |
7795ac51 | 13268 | for (int depth = 0; depth < this->depth_; ++depth) |
a01f2481 | 13269 | { |
13270 | if (type->array_type() != NULL) | |
13271 | type = type->array_type()->element_type(); | |
13272 | else if (type->map_type() != NULL) | |
7795ac51 | 13273 | { |
13274 | if (this->key_path_[depth]) | |
13275 | type = type->map_type()->key_type(); | |
13276 | else | |
13277 | type = type->map_type()->val_type(); | |
13278 | } | |
a01f2481 | 13279 | else |
13280 | { | |
13281 | // This error will be reported during lowering. | |
13282 | return TRAVERSE_CONTINUE; | |
13283 | } | |
13284 | } | |
13285 | ||
dbffccfc | 13286 | while (true) |
13287 | { | |
13288 | if (type->classification() == Type::TYPE_NAMED) | |
13289 | type = type->named_type()->real_type(); | |
13290 | else if (type->classification() == Type::TYPE_FORWARD) | |
13291 | { | |
13292 | Type* t = type->forwarded(); | |
13293 | if (t == type) | |
13294 | break; | |
13295 | type = t; | |
13296 | } | |
13297 | else | |
13298 | break; | |
13299 | } | |
13300 | ||
13301 | if (type->classification() == Type::TYPE_STRUCT) | |
13302 | { | |
13303 | Expression_list::iterator p = this->vals_->begin(); | |
13304 | while (p != this->vals_->end()) | |
13305 | { | |
13306 | // Skip key. | |
13307 | ++p; | |
13308 | go_assert(p != this->vals_->end()); | |
13309 | if (Expression::traverse(&*p, traverse) == TRAVERSE_EXIT) | |
13310 | return TRAVERSE_EXIT; | |
13311 | ++p; | |
13312 | } | |
13313 | return TRAVERSE_CONTINUE; | |
13314 | } | |
13315 | } | |
13316 | ||
13317 | if (this->vals_ != NULL) | |
13318 | return this->vals_->traverse(traverse); | |
13319 | ||
13320 | return TRAVERSE_CONTINUE; | |
e440a328 | 13321 | } |
13322 | ||
13323 | // Lower a generic composite literal into a specific version based on | |
13324 | // the type. | |
13325 | ||
13326 | Expression* | |
ceeb4318 | 13327 | Composite_literal_expression::do_lower(Gogo* gogo, Named_object* function, |
13328 | Statement_inserter* inserter, int) | |
e440a328 | 13329 | { |
13330 | Type* type = this->type_; | |
13331 | ||
7795ac51 | 13332 | for (int depth = 0; depth < this->depth_; ++depth) |
e440a328 | 13333 | { |
13334 | if (type->array_type() != NULL) | |
13335 | type = type->array_type()->element_type(); | |
13336 | else if (type->map_type() != NULL) | |
7795ac51 | 13337 | { |
13338 | if (this->key_path_[depth]) | |
13339 | type = type->map_type()->key_type(); | |
13340 | else | |
13341 | type = type->map_type()->val_type(); | |
13342 | } | |
e440a328 | 13343 | else |
13344 | { | |
5c13bd80 | 13345 | if (!type->is_error()) |
631d5788 | 13346 | go_error_at(this->location(), |
13347 | ("may only omit types within composite literals " | |
13348 | "of slice, array, or map type")); | |
e440a328 | 13349 | return Expression::make_error(this->location()); |
13350 | } | |
13351 | } | |
13352 | ||
e00772b3 | 13353 | Type *pt = type->points_to(); |
13354 | bool is_pointer = false; | |
13355 | if (pt != NULL) | |
13356 | { | |
13357 | is_pointer = true; | |
13358 | type = pt; | |
13359 | } | |
13360 | ||
13361 | Expression* ret; | |
5c13bd80 | 13362 | if (type->is_error()) |
e440a328 | 13363 | return Expression::make_error(this->location()); |
13364 | else if (type->struct_type() != NULL) | |
e00772b3 | 13365 | ret = this->lower_struct(gogo, type); |
e440a328 | 13366 | else if (type->array_type() != NULL) |
113ef6a5 | 13367 | ret = this->lower_array(type); |
e440a328 | 13368 | else if (type->map_type() != NULL) |
e00772b3 | 13369 | ret = this->lower_map(gogo, function, inserter, type); |
e440a328 | 13370 | else |
13371 | { | |
631d5788 | 13372 | go_error_at(this->location(), |
13373 | ("expected struct, slice, array, or map type " | |
13374 | "for composite literal")); | |
e440a328 | 13375 | return Expression::make_error(this->location()); |
13376 | } | |
e00772b3 | 13377 | |
13378 | if (is_pointer) | |
2c809f8f | 13379 | ret = Expression::make_heap_expression(ret, this->location()); |
e00772b3 | 13380 | |
13381 | return ret; | |
e440a328 | 13382 | } |
13383 | ||
13384 | // Lower a struct composite literal. | |
13385 | ||
13386 | Expression* | |
81c4b26b | 13387 | Composite_literal_expression::lower_struct(Gogo* gogo, Type* type) |
e440a328 | 13388 | { |
b13c66cd | 13389 | Location location = this->location(); |
e440a328 | 13390 | Struct_type* st = type->struct_type(); |
13391 | if (this->vals_ == NULL || !this->has_keys_) | |
07daa4e7 | 13392 | { |
e6013c28 | 13393 | if (this->vals_ != NULL |
13394 | && !this->vals_->empty() | |
13395 | && type->named_type() != NULL | |
13396 | && type->named_type()->named_object()->package() != NULL) | |
13397 | { | |
13398 | for (Struct_field_list::const_iterator pf = st->fields()->begin(); | |
13399 | pf != st->fields()->end(); | |
13400 | ++pf) | |
07daa4e7 | 13401 | { |
07ba7f26 | 13402 | if (Gogo::is_hidden_name(pf->field_name()) |
13403 | || pf->is_embedded_builtin(gogo)) | |
631d5788 | 13404 | go_error_at(this->location(), |
13405 | "assignment of unexported field %qs in %qs literal", | |
13406 | Gogo::message_name(pf->field_name()).c_str(), | |
13407 | type->named_type()->message_name().c_str()); | |
07daa4e7 | 13408 | } |
13409 | } | |
13410 | ||
13411 | return new Struct_construction_expression(type, this->vals_, location); | |
13412 | } | |
e440a328 | 13413 | |
13414 | size_t field_count = st->field_count(); | |
13415 | std::vector<Expression*> vals(field_count); | |
e32de7ba | 13416 | std::vector<unsigned long>* traverse_order = new(std::vector<unsigned long>); |
e440a328 | 13417 | Expression_list::const_iterator p = this->vals_->begin(); |
62750cd5 | 13418 | Expression* external_expr = NULL; |
13419 | const Named_object* external_no = NULL; | |
e440a328 | 13420 | while (p != this->vals_->end()) |
13421 | { | |
13422 | Expression* name_expr = *p; | |
13423 | ||
13424 | ++p; | |
c484d925 | 13425 | go_assert(p != this->vals_->end()); |
e440a328 | 13426 | Expression* val = *p; |
13427 | ||
13428 | ++p; | |
13429 | ||
13430 | if (name_expr == NULL) | |
13431 | { | |
631d5788 | 13432 | go_error_at(val->location(), |
13433 | "mixture of field and value initializers"); | |
e440a328 | 13434 | return Expression::make_error(location); |
13435 | } | |
13436 | ||
13437 | bool bad_key = false; | |
13438 | std::string name; | |
81c4b26b | 13439 | const Named_object* no = NULL; |
e440a328 | 13440 | switch (name_expr->classification()) |
13441 | { | |
13442 | case EXPRESSION_UNKNOWN_REFERENCE: | |
13443 | name = name_expr->unknown_expression()->name(); | |
7f7ce694 | 13444 | if (type->named_type() != NULL) |
13445 | { | |
13446 | // If the named object found for this field name comes from a | |
13447 | // different package than the struct it is a part of, do not count | |
13448 | // this incorrect lookup as a usage of the object's package. | |
13449 | no = name_expr->unknown_expression()->named_object(); | |
13450 | if (no->package() != NULL | |
13451 | && no->package() != type->named_type()->named_object()->package()) | |
13452 | no->package()->forget_usage(name_expr); | |
13453 | } | |
e440a328 | 13454 | break; |
13455 | ||
13456 | case EXPRESSION_CONST_REFERENCE: | |
81c4b26b | 13457 | no = static_cast<Const_expression*>(name_expr)->named_object(); |
e440a328 | 13458 | break; |
13459 | ||
13460 | case EXPRESSION_TYPE: | |
13461 | { | |
13462 | Type* t = name_expr->type(); | |
13463 | Named_type* nt = t->named_type(); | |
13464 | if (nt == NULL) | |
13465 | bad_key = true; | |
13466 | else | |
81c4b26b | 13467 | no = nt->named_object(); |
e440a328 | 13468 | } |
13469 | break; | |
13470 | ||
13471 | case EXPRESSION_VAR_REFERENCE: | |
81c4b26b | 13472 | no = name_expr->var_expression()->named_object(); |
e440a328 | 13473 | break; |
13474 | ||
b0c09712 | 13475 | case EXPRESSION_ENCLOSED_VAR_REFERENCE: |
13476 | no = name_expr->enclosed_var_expression()->variable(); | |
e440a328 | 13477 | break; |
13478 | ||
b0c09712 | 13479 | case EXPRESSION_FUNC_REFERENCE: |
13480 | no = name_expr->func_expression()->named_object(); | |
e440a328 | 13481 | break; |
13482 | ||
13483 | default: | |
13484 | bad_key = true; | |
13485 | break; | |
13486 | } | |
13487 | if (bad_key) | |
13488 | { | |
631d5788 | 13489 | go_error_at(name_expr->location(), "expected struct field name"); |
e440a328 | 13490 | return Expression::make_error(location); |
13491 | } | |
13492 | ||
81c4b26b | 13493 | if (no != NULL) |
13494 | { | |
62750cd5 | 13495 | if (no->package() != NULL && external_expr == NULL) |
13496 | { | |
13497 | external_expr = name_expr; | |
13498 | external_no = no; | |
13499 | } | |
13500 | ||
81c4b26b | 13501 | name = no->name(); |
13502 | ||
13503 | // A predefined name won't be packed. If it starts with a | |
13504 | // lower case letter we need to check for that case, because | |
2d29d278 | 13505 | // the field name will be packed. FIXME. |
81c4b26b | 13506 | if (!Gogo::is_hidden_name(name) |
13507 | && name[0] >= 'a' | |
13508 | && name[0] <= 'z') | |
13509 | { | |
13510 | Named_object* gno = gogo->lookup_global(name.c_str()); | |
13511 | if (gno == no) | |
13512 | name = gogo->pack_hidden_name(name, false); | |
13513 | } | |
13514 | } | |
13515 | ||
e440a328 | 13516 | unsigned int index; |
13517 | const Struct_field* sf = st->find_local_field(name, &index); | |
13518 | if (sf == NULL) | |
13519 | { | |
631d5788 | 13520 | go_error_at(name_expr->location(), "unknown field %qs in %qs", |
13521 | Gogo::message_name(name).c_str(), | |
13522 | (type->named_type() != NULL | |
13523 | ? type->named_type()->message_name().c_str() | |
13524 | : "unnamed struct")); | |
e440a328 | 13525 | return Expression::make_error(location); |
13526 | } | |
13527 | if (vals[index] != NULL) | |
13528 | { | |
631d5788 | 13529 | go_error_at(name_expr->location(), |
13530 | "duplicate value for field %qs in %qs", | |
13531 | Gogo::message_name(name).c_str(), | |
13532 | (type->named_type() != NULL | |
13533 | ? type->named_type()->message_name().c_str() | |
13534 | : "unnamed struct")); | |
e440a328 | 13535 | return Expression::make_error(location); |
13536 | } | |
13537 | ||
07daa4e7 | 13538 | if (type->named_type() != NULL |
13539 | && type->named_type()->named_object()->package() != NULL | |
07ba7f26 | 13540 | && (Gogo::is_hidden_name(sf->field_name()) |
13541 | || sf->is_embedded_builtin(gogo))) | |
631d5788 | 13542 | go_error_at(name_expr->location(), |
13543 | "assignment of unexported field %qs in %qs literal", | |
13544 | Gogo::message_name(sf->field_name()).c_str(), | |
13545 | type->named_type()->message_name().c_str()); | |
07daa4e7 | 13546 | |
e440a328 | 13547 | vals[index] = val; |
e32de7ba | 13548 | traverse_order->push_back(static_cast<unsigned long>(index)); |
e440a328 | 13549 | } |
13550 | ||
62750cd5 | 13551 | if (!this->all_are_names_) |
13552 | { | |
13553 | // This is a weird case like bug462 in the testsuite. | |
13554 | if (external_expr == NULL) | |
631d5788 | 13555 | go_error_at(this->location(), "unknown field in %qs literal", |
13556 | (type->named_type() != NULL | |
13557 | ? type->named_type()->message_name().c_str() | |
13558 | : "unnamed struct")); | |
62750cd5 | 13559 | else |
631d5788 | 13560 | go_error_at(external_expr->location(), "unknown field %qs in %qs", |
13561 | external_no->message_name().c_str(), | |
13562 | (type->named_type() != NULL | |
13563 | ? type->named_type()->message_name().c_str() | |
13564 | : "unnamed struct")); | |
62750cd5 | 13565 | return Expression::make_error(location); |
13566 | } | |
13567 | ||
e440a328 | 13568 | Expression_list* list = new Expression_list; |
13569 | list->reserve(field_count); | |
13570 | for (size_t i = 0; i < field_count; ++i) | |
13571 | list->push_back(vals[i]); | |
13572 | ||
0c4f5a19 | 13573 | Struct_construction_expression* ret = |
13574 | new Struct_construction_expression(type, list, location); | |
13575 | ret->set_traverse_order(traverse_order); | |
13576 | return ret; | |
e440a328 | 13577 | } |
13578 | ||
e32de7ba | 13579 | // Index/value/traversal-order triple. |
00773463 | 13580 | |
e32de7ba | 13581 | struct IVT_triple { |
13582 | unsigned long index; | |
13583 | unsigned long traversal_order; | |
13584 | Expression* expr; | |
13585 | IVT_triple(unsigned long i, unsigned long to, Expression *e) | |
13586 | : index(i), traversal_order(to), expr(e) { } | |
13587 | bool operator<(const IVT_triple& other) const | |
13588 | { return this->index < other.index; } | |
00773463 | 13589 | }; |
13590 | ||
e440a328 | 13591 | // Lower an array composite literal. |
13592 | ||
13593 | Expression* | |
113ef6a5 | 13594 | Composite_literal_expression::lower_array(Type* type) |
e440a328 | 13595 | { |
b13c66cd | 13596 | Location location = this->location(); |
e440a328 | 13597 | if (this->vals_ == NULL || !this->has_keys_) |
ffe743ca | 13598 | return this->make_array(type, NULL, this->vals_); |
e440a328 | 13599 | |
ffe743ca | 13600 | std::vector<unsigned long>* indexes = new std::vector<unsigned long>; |
13601 | indexes->reserve(this->vals_->size()); | |
00773463 | 13602 | bool indexes_out_of_order = false; |
ffe743ca | 13603 | Expression_list* vals = new Expression_list(); |
13604 | vals->reserve(this->vals_->size()); | |
e440a328 | 13605 | unsigned long index = 0; |
13606 | Expression_list::const_iterator p = this->vals_->begin(); | |
13607 | while (p != this->vals_->end()) | |
13608 | { | |
13609 | Expression* index_expr = *p; | |
13610 | ||
13611 | ++p; | |
c484d925 | 13612 | go_assert(p != this->vals_->end()); |
e440a328 | 13613 | Expression* val = *p; |
13614 | ||
13615 | ++p; | |
13616 | ||
ffe743ca | 13617 | if (index_expr == NULL) |
13618 | { | |
13619 | if (!indexes->empty()) | |
13620 | indexes->push_back(index); | |
13621 | } | |
13622 | else | |
e440a328 | 13623 | { |
ffe743ca | 13624 | if (indexes->empty() && !vals->empty()) |
13625 | { | |
13626 | for (size_t i = 0; i < vals->size(); ++i) | |
13627 | indexes->push_back(i); | |
13628 | } | |
13629 | ||
0c77715b | 13630 | Numeric_constant nc; |
13631 | if (!index_expr->numeric_constant_value(&nc)) | |
e440a328 | 13632 | { |
631d5788 | 13633 | go_error_at(index_expr->location(), |
13634 | "index expression is not integer constant"); | |
e440a328 | 13635 | return Expression::make_error(location); |
13636 | } | |
6f6d9955 | 13637 | |
0c77715b | 13638 | switch (nc.to_unsigned_long(&index)) |
e440a328 | 13639 | { |
0c77715b | 13640 | case Numeric_constant::NC_UL_VALID: |
13641 | break; | |
13642 | case Numeric_constant::NC_UL_NOTINT: | |
631d5788 | 13643 | go_error_at(index_expr->location(), |
13644 | "index expression is not integer constant"); | |
0c77715b | 13645 | return Expression::make_error(location); |
13646 | case Numeric_constant::NC_UL_NEGATIVE: | |
631d5788 | 13647 | go_error_at(index_expr->location(), |
13648 | "index expression is negative"); | |
e440a328 | 13649 | return Expression::make_error(location); |
0c77715b | 13650 | case Numeric_constant::NC_UL_BIG: |
631d5788 | 13651 | go_error_at(index_expr->location(), "index value overflow"); |
e440a328 | 13652 | return Expression::make_error(location); |
0c77715b | 13653 | default: |
13654 | go_unreachable(); | |
e440a328 | 13655 | } |
6f6d9955 | 13656 | |
13657 | Named_type* ntype = Type::lookup_integer_type("int"); | |
13658 | Integer_type* inttype = ntype->integer_type(); | |
0c77715b | 13659 | if (sizeof(index) <= static_cast<size_t>(inttype->bits() * 8) |
13660 | && index >> (inttype->bits() - 1) != 0) | |
6f6d9955 | 13661 | { |
631d5788 | 13662 | go_error_at(index_expr->location(), "index value overflow"); |
6f6d9955 | 13663 | return Expression::make_error(location); |
13664 | } | |
13665 | ||
ffe743ca | 13666 | if (std::find(indexes->begin(), indexes->end(), index) |
13667 | != indexes->end()) | |
e440a328 | 13668 | { |
631d5788 | 13669 | go_error_at(index_expr->location(), |
13670 | "duplicate value for index %lu", | |
13671 | index); | |
e440a328 | 13672 | return Expression::make_error(location); |
13673 | } | |
ffe743ca | 13674 | |
00773463 | 13675 | if (!indexes->empty() && index < indexes->back()) |
13676 | indexes_out_of_order = true; | |
13677 | ||
ffe743ca | 13678 | indexes->push_back(index); |
e440a328 | 13679 | } |
13680 | ||
ffe743ca | 13681 | vals->push_back(val); |
13682 | ||
e440a328 | 13683 | ++index; |
13684 | } | |
13685 | ||
ffe743ca | 13686 | if (indexes->empty()) |
13687 | { | |
13688 | delete indexes; | |
13689 | indexes = NULL; | |
13690 | } | |
e440a328 | 13691 | |
e32de7ba | 13692 | std::vector<unsigned long>* traverse_order = NULL; |
00773463 | 13693 | if (indexes_out_of_order) |
13694 | { | |
e32de7ba | 13695 | typedef std::vector<IVT_triple> V; |
00773463 | 13696 | |
13697 | V v; | |
13698 | v.reserve(indexes->size()); | |
13699 | std::vector<unsigned long>::const_iterator pi = indexes->begin(); | |
e32de7ba | 13700 | unsigned long torder = 0; |
00773463 | 13701 | for (Expression_list::const_iterator pe = vals->begin(); |
13702 | pe != vals->end(); | |
e32de7ba | 13703 | ++pe, ++pi, ++torder) |
13704 | v.push_back(IVT_triple(*pi, torder, *pe)); | |
00773463 | 13705 | |
e32de7ba | 13706 | std::sort(v.begin(), v.end()); |
00773463 | 13707 | |
13708 | delete indexes; | |
13709 | delete vals; | |
e32de7ba | 13710 | |
00773463 | 13711 | indexes = new std::vector<unsigned long>(); |
13712 | indexes->reserve(v.size()); | |
13713 | vals = new Expression_list(); | |
13714 | vals->reserve(v.size()); | |
e32de7ba | 13715 | traverse_order = new std::vector<unsigned long>(); |
13716 | traverse_order->reserve(v.size()); | |
00773463 | 13717 | |
13718 | for (V::const_iterator p = v.begin(); p != v.end(); ++p) | |
13719 | { | |
e32de7ba | 13720 | indexes->push_back(p->index); |
13721 | vals->push_back(p->expr); | |
13722 | traverse_order->push_back(p->traversal_order); | |
00773463 | 13723 | } |
13724 | } | |
13725 | ||
e32de7ba | 13726 | Expression* ret = this->make_array(type, indexes, vals); |
13727 | Array_construction_expression* ace = ret->array_literal(); | |
13728 | if (ace != NULL && traverse_order != NULL) | |
13729 | ace->set_traverse_order(traverse_order); | |
13730 | return ret; | |
e440a328 | 13731 | } |
13732 | ||
13733 | // Actually build the array composite literal. This handles | |
13734 | // [...]{...}. | |
13735 | ||
13736 | Expression* | |
ffe743ca | 13737 | Composite_literal_expression::make_array( |
13738 | Type* type, | |
13739 | const std::vector<unsigned long>* indexes, | |
13740 | Expression_list* vals) | |
e440a328 | 13741 | { |
b13c66cd | 13742 | Location location = this->location(); |
e440a328 | 13743 | Array_type* at = type->array_type(); |
ffe743ca | 13744 | |
e440a328 | 13745 | if (at->length() != NULL && at->length()->is_nil_expression()) |
13746 | { | |
ffe743ca | 13747 | size_t size; |
13748 | if (vals == NULL) | |
13749 | size = 0; | |
00773463 | 13750 | else if (indexes != NULL) |
13751 | size = indexes->back() + 1; | |
13752 | else | |
ffe743ca | 13753 | { |
13754 | size = vals->size(); | |
13755 | Integer_type* it = Type::lookup_integer_type("int")->integer_type(); | |
13756 | if (sizeof(size) <= static_cast<size_t>(it->bits() * 8) | |
13757 | && size >> (it->bits() - 1) != 0) | |
13758 | { | |
631d5788 | 13759 | go_error_at(location, "too many elements in composite literal"); |
ffe743ca | 13760 | return Expression::make_error(location); |
13761 | } | |
13762 | } | |
ffe743ca | 13763 | |
e67508fa | 13764 | Expression* elen = Expression::make_integer_ul(size, NULL, location); |
e440a328 | 13765 | at = Type::make_array_type(at->element_type(), elen); |
13766 | type = at; | |
13767 | } | |
ffe743ca | 13768 | else if (at->length() != NULL |
13769 | && !at->length()->is_error_expression() | |
13770 | && this->vals_ != NULL) | |
13771 | { | |
13772 | Numeric_constant nc; | |
13773 | unsigned long val; | |
13774 | if (at->length()->numeric_constant_value(&nc) | |
13775 | && nc.to_unsigned_long(&val) == Numeric_constant::NC_UL_VALID) | |
13776 | { | |
13777 | if (indexes == NULL) | |
13778 | { | |
13779 | if (this->vals_->size() > val) | |
13780 | { | |
631d5788 | 13781 | go_error_at(location, |
13782 | "too many elements in composite literal"); | |
ffe743ca | 13783 | return Expression::make_error(location); |
13784 | } | |
13785 | } | |
13786 | else | |
13787 | { | |
00773463 | 13788 | unsigned long max = indexes->back(); |
ffe743ca | 13789 | if (max >= val) |
13790 | { | |
631d5788 | 13791 | go_error_at(location, |
13792 | ("some element keys in composite literal " | |
13793 | "are out of range")); | |
ffe743ca | 13794 | return Expression::make_error(location); |
13795 | } | |
13796 | } | |
13797 | } | |
13798 | } | |
13799 | ||
e440a328 | 13800 | if (at->length() != NULL) |
ffe743ca | 13801 | return new Fixed_array_construction_expression(type, indexes, vals, |
13802 | location); | |
e440a328 | 13803 | else |
2c809f8f | 13804 | return new Slice_construction_expression(type, indexes, vals, location); |
e440a328 | 13805 | } |
13806 | ||
13807 | // Lower a map composite literal. | |
13808 | ||
13809 | Expression* | |
a287720d | 13810 | Composite_literal_expression::lower_map(Gogo* gogo, Named_object* function, |
ceeb4318 | 13811 | Statement_inserter* inserter, |
a287720d | 13812 | Type* type) |
e440a328 | 13813 | { |
b13c66cd | 13814 | Location location = this->location(); |
e440a328 | 13815 | if (this->vals_ != NULL) |
13816 | { | |
13817 | if (!this->has_keys_) | |
13818 | { | |
631d5788 | 13819 | go_error_at(location, "map composite literal must have keys"); |
e440a328 | 13820 | return Expression::make_error(location); |
13821 | } | |
13822 | ||
a287720d | 13823 | for (Expression_list::iterator p = this->vals_->begin(); |
e440a328 | 13824 | p != this->vals_->end(); |
13825 | p += 2) | |
13826 | { | |
13827 | if (*p == NULL) | |
13828 | { | |
13829 | ++p; | |
631d5788 | 13830 | go_error_at((*p)->location(), |
13831 | ("map composite literal must " | |
13832 | "have keys for every value")); | |
e440a328 | 13833 | return Expression::make_error(location); |
13834 | } | |
a287720d | 13835 | // Make sure we have lowered the key; it may not have been |
13836 | // lowered in order to handle keys for struct composite | |
13837 | // literals. Lower it now to get the right error message. | |
13838 | if ((*p)->unknown_expression() != NULL) | |
13839 | { | |
13840 | (*p)->unknown_expression()->clear_is_composite_literal_key(); | |
ceeb4318 | 13841 | gogo->lower_expression(function, inserter, &*p); |
c484d925 | 13842 | go_assert((*p)->is_error_expression()); |
a287720d | 13843 | return Expression::make_error(location); |
13844 | } | |
e440a328 | 13845 | } |
13846 | } | |
13847 | ||
13848 | return new Map_construction_expression(type, this->vals_, location); | |
13849 | } | |
13850 | ||
d751bb78 | 13851 | // Dump ast representation for a composite literal expression. |
13852 | ||
13853 | void | |
13854 | Composite_literal_expression::do_dump_expression( | |
13855 | Ast_dump_context* ast_dump_context) const | |
13856 | { | |
8b1c301d | 13857 | ast_dump_context->ostream() << "composite("; |
d751bb78 | 13858 | ast_dump_context->dump_type(this->type_); |
13859 | ast_dump_context->ostream() << ", {"; | |
8b1c301d | 13860 | ast_dump_context->dump_expression_list(this->vals_, this->has_keys_); |
d751bb78 | 13861 | ast_dump_context->ostream() << "})"; |
13862 | } | |
13863 | ||
e440a328 | 13864 | // Make a composite literal expression. |
13865 | ||
13866 | Expression* | |
13867 | Expression::make_composite_literal(Type* type, int depth, bool has_keys, | |
62750cd5 | 13868 | Expression_list* vals, bool all_are_names, |
b13c66cd | 13869 | Location location) |
e440a328 | 13870 | { |
13871 | return new Composite_literal_expression(type, depth, has_keys, vals, | |
62750cd5 | 13872 | all_are_names, location); |
e440a328 | 13873 | } |
13874 | ||
13875 | // Return whether this expression is a composite literal. | |
13876 | ||
13877 | bool | |
13878 | Expression::is_composite_literal() const | |
13879 | { | |
13880 | switch (this->classification_) | |
13881 | { | |
13882 | case EXPRESSION_COMPOSITE_LITERAL: | |
13883 | case EXPRESSION_STRUCT_CONSTRUCTION: | |
13884 | case EXPRESSION_FIXED_ARRAY_CONSTRUCTION: | |
2c809f8f | 13885 | case EXPRESSION_SLICE_CONSTRUCTION: |
e440a328 | 13886 | case EXPRESSION_MAP_CONSTRUCTION: |
13887 | return true; | |
13888 | default: | |
13889 | return false; | |
13890 | } | |
13891 | } | |
13892 | ||
13893 | // Return whether this expression is a composite literal which is not | |
13894 | // constant. | |
13895 | ||
13896 | bool | |
13897 | Expression::is_nonconstant_composite_literal() const | |
13898 | { | |
13899 | switch (this->classification_) | |
13900 | { | |
13901 | case EXPRESSION_STRUCT_CONSTRUCTION: | |
13902 | { | |
13903 | const Struct_construction_expression *psce = | |
13904 | static_cast<const Struct_construction_expression*>(this); | |
13905 | return !psce->is_constant_struct(); | |
13906 | } | |
13907 | case EXPRESSION_FIXED_ARRAY_CONSTRUCTION: | |
13908 | { | |
13909 | const Fixed_array_construction_expression *pace = | |
13910 | static_cast<const Fixed_array_construction_expression*>(this); | |
13911 | return !pace->is_constant_array(); | |
13912 | } | |
2c809f8f | 13913 | case EXPRESSION_SLICE_CONSTRUCTION: |
e440a328 | 13914 | { |
2c809f8f | 13915 | const Slice_construction_expression *pace = |
13916 | static_cast<const Slice_construction_expression*>(this); | |
e440a328 | 13917 | return !pace->is_constant_array(); |
13918 | } | |
13919 | case EXPRESSION_MAP_CONSTRUCTION: | |
13920 | return true; | |
13921 | default: | |
13922 | return false; | |
13923 | } | |
13924 | } | |
13925 | ||
35a54f17 | 13926 | // Return true if this is a variable or temporary_variable. |
13927 | ||
13928 | bool | |
13929 | Expression::is_variable() const | |
13930 | { | |
13931 | switch (this->classification_) | |
13932 | { | |
13933 | case EXPRESSION_VAR_REFERENCE: | |
13934 | case EXPRESSION_TEMPORARY_REFERENCE: | |
13935 | case EXPRESSION_SET_AND_USE_TEMPORARY: | |
b0c09712 | 13936 | case EXPRESSION_ENCLOSED_VAR_REFERENCE: |
35a54f17 | 13937 | return true; |
13938 | default: | |
13939 | return false; | |
13940 | } | |
13941 | } | |
13942 | ||
e440a328 | 13943 | // Return true if this is a reference to a local variable. |
13944 | ||
13945 | bool | |
13946 | Expression::is_local_variable() const | |
13947 | { | |
13948 | const Var_expression* ve = this->var_expression(); | |
13949 | if (ve == NULL) | |
13950 | return false; | |
13951 | const Named_object* no = ve->named_object(); | |
13952 | return (no->is_result_variable() | |
13953 | || (no->is_variable() && !no->var_value()->is_global())); | |
13954 | } | |
13955 | ||
13956 | // Class Type_guard_expression. | |
13957 | ||
13958 | // Traversal. | |
13959 | ||
13960 | int | |
13961 | Type_guard_expression::do_traverse(Traverse* traverse) | |
13962 | { | |
13963 | if (Expression::traverse(&this->expr_, traverse) == TRAVERSE_EXIT | |
13964 | || Type::traverse(this->type_, traverse) == TRAVERSE_EXIT) | |
13965 | return TRAVERSE_EXIT; | |
13966 | return TRAVERSE_CONTINUE; | |
13967 | } | |
13968 | ||
2c809f8f | 13969 | Expression* |
13970 | Type_guard_expression::do_flatten(Gogo*, Named_object*, | |
13971 | Statement_inserter* inserter) | |
13972 | { | |
5bf8be8b | 13973 | if (this->expr_->is_error_expression() |
13974 | || this->expr_->type()->is_error_type()) | |
13975 | { | |
13976 | go_assert(saw_errors()); | |
13977 | return Expression::make_error(this->location()); | |
13978 | } | |
13979 | ||
2c809f8f | 13980 | if (!this->expr_->is_variable()) |
13981 | { | |
13982 | Temporary_statement* temp = Statement::make_temporary(NULL, this->expr_, | |
13983 | this->location()); | |
13984 | inserter->insert(temp); | |
13985 | this->expr_ = | |
13986 | Expression::make_temporary_reference(temp, this->location()); | |
13987 | } | |
13988 | return this; | |
13989 | } | |
13990 | ||
e440a328 | 13991 | // Check types of a type guard expression. The expression must have |
13992 | // an interface type, but the actual type conversion is checked at run | |
13993 | // time. | |
13994 | ||
13995 | void | |
13996 | Type_guard_expression::do_check_types(Gogo*) | |
13997 | { | |
e440a328 | 13998 | Type* expr_type = this->expr_->type(); |
7e9da23f | 13999 | if (expr_type->interface_type() == NULL) |
f725ade8 | 14000 | { |
5c13bd80 | 14001 | if (!expr_type->is_error() && !this->type_->is_error()) |
f725ade8 | 14002 | this->report_error(_("type assertion only valid for interface types")); |
14003 | this->set_is_error(); | |
14004 | } | |
e440a328 | 14005 | else if (this->type_->interface_type() == NULL) |
14006 | { | |
14007 | std::string reason; | |
14008 | if (!expr_type->interface_type()->implements_interface(this->type_, | |
14009 | &reason)) | |
14010 | { | |
5c13bd80 | 14011 | if (!this->type_->is_error()) |
e440a328 | 14012 | { |
f725ade8 | 14013 | if (reason.empty()) |
14014 | this->report_error(_("impossible type assertion: " | |
14015 | "type does not implement interface")); | |
14016 | else | |
631d5788 | 14017 | go_error_at(this->location(), |
14018 | ("impossible type assertion: " | |
14019 | "type does not implement interface (%s)"), | |
14020 | reason.c_str()); | |
e440a328 | 14021 | } |
f725ade8 | 14022 | this->set_is_error(); |
e440a328 | 14023 | } |
14024 | } | |
14025 | } | |
14026 | ||
ea664253 | 14027 | // Return the backend representation for a type guard expression. |
e440a328 | 14028 | |
ea664253 | 14029 | Bexpression* |
14030 | Type_guard_expression::do_get_backend(Translate_context* context) | |
e440a328 | 14031 | { |
2c809f8f | 14032 | Expression* conversion; |
7e9da23f | 14033 | if (this->type_->interface_type() != NULL) |
2c809f8f | 14034 | conversion = |
14035 | Expression::convert_interface_to_interface(this->type_, this->expr_, | |
14036 | true, this->location()); | |
e440a328 | 14037 | else |
2c809f8f | 14038 | conversion = |
14039 | Expression::convert_for_assignment(context->gogo(), this->type_, | |
14040 | this->expr_, this->location()); | |
14041 | ||
ea664253 | 14042 | return conversion->get_backend(context); |
e440a328 | 14043 | } |
14044 | ||
d751bb78 | 14045 | // Dump ast representation for a type guard expression. |
14046 | ||
14047 | void | |
2c809f8f | 14048 | Type_guard_expression::do_dump_expression(Ast_dump_context* ast_dump_context) |
d751bb78 | 14049 | const |
14050 | { | |
14051 | this->expr_->dump_expression(ast_dump_context); | |
14052 | ast_dump_context->ostream() << "."; | |
14053 | ast_dump_context->dump_type(this->type_); | |
14054 | } | |
14055 | ||
e440a328 | 14056 | // Make a type guard expression. |
14057 | ||
14058 | Expression* | |
14059 | Expression::make_type_guard(Expression* expr, Type* type, | |
b13c66cd | 14060 | Location location) |
e440a328 | 14061 | { |
14062 | return new Type_guard_expression(expr, type, location); | |
14063 | } | |
14064 | ||
2c809f8f | 14065 | // Class Heap_expression. |
e440a328 | 14066 | |
da244e59 | 14067 | // Return the type of the expression stored on the heap. |
e440a328 | 14068 | |
da244e59 | 14069 | Type* |
14070 | Heap_expression::do_type() | |
14071 | { return Type::make_pointer_type(this->expr_->type()); } | |
e440a328 | 14072 | |
ea664253 | 14073 | // Return the backend representation for allocating an expression on the heap. |
e440a328 | 14074 | |
ea664253 | 14075 | Bexpression* |
14076 | Heap_expression::do_get_backend(Translate_context* context) | |
e440a328 | 14077 | { |
02c19a1a | 14078 | if (this->expr_->is_error_expression() || this->expr_->type()->is_error()) |
ea664253 | 14079 | return context->backend()->error_expression(); |
2c809f8f | 14080 | |
02c19a1a | 14081 | Location loc = this->location(); |
2c809f8f | 14082 | Gogo* gogo = context->gogo(); |
02c19a1a | 14083 | Btype* btype = this->type()->get_backend(gogo); |
45ff893b | 14084 | |
14085 | Expression* alloc = Expression::make_allocation(this->expr_->type(), loc); | |
14086 | Node* n = Node::make_node(this); | |
14087 | if ((n->encoding() & ESCAPE_MASK) == int(Node::ESCAPE_NONE)) | |
14088 | alloc->allocation_expression()->set_allocate_on_stack(); | |
14089 | Bexpression* space = alloc->get_backend(context); | |
02c19a1a | 14090 | |
14091 | Bstatement* decl; | |
14092 | Named_object* fn = context->function(); | |
14093 | go_assert(fn != NULL); | |
14094 | Bfunction* fndecl = fn->func_value()->get_or_make_decl(gogo, fn); | |
14095 | Bvariable* space_temp = | |
14096 | gogo->backend()->temporary_variable(fndecl, context->bblock(), btype, | |
14097 | space, true, loc, &decl); | |
14098 | space = gogo->backend()->var_expression(space_temp, loc); | |
9b27b43c | 14099 | Btype* expr_btype = this->expr_->type()->get_backend(gogo); |
14100 | Bexpression* ref = | |
14101 | gogo->backend()->indirect_expression(expr_btype, space, true, loc); | |
02c19a1a | 14102 | |
ea664253 | 14103 | Bexpression* bexpr = this->expr_->get_backend(context); |
02c19a1a | 14104 | Bstatement* assn = gogo->backend()->assignment_statement(ref, bexpr, loc); |
14105 | decl = gogo->backend()->compound_statement(decl, assn); | |
14106 | space = gogo->backend()->var_expression(space_temp, loc); | |
ea664253 | 14107 | return gogo->backend()->compound_expression(decl, space, loc); |
e440a328 | 14108 | } |
14109 | ||
2c809f8f | 14110 | // Dump ast representation for a heap expression. |
d751bb78 | 14111 | |
14112 | void | |
2c809f8f | 14113 | Heap_expression::do_dump_expression( |
d751bb78 | 14114 | Ast_dump_context* ast_dump_context) const |
14115 | { | |
14116 | ast_dump_context->ostream() << "&("; | |
14117 | ast_dump_context->dump_expression(this->expr_); | |
14118 | ast_dump_context->ostream() << ")"; | |
14119 | } | |
14120 | ||
2c809f8f | 14121 | // Allocate an expression on the heap. |
e440a328 | 14122 | |
14123 | Expression* | |
2c809f8f | 14124 | Expression::make_heap_expression(Expression* expr, Location location) |
e440a328 | 14125 | { |
2c809f8f | 14126 | return new Heap_expression(expr, location); |
e440a328 | 14127 | } |
14128 | ||
14129 | // Class Receive_expression. | |
14130 | ||
14131 | // Return the type of a receive expression. | |
14132 | ||
14133 | Type* | |
14134 | Receive_expression::do_type() | |
14135 | { | |
e429e3bd | 14136 | if (this->is_error_expression()) |
14137 | return Type::make_error_type(); | |
e440a328 | 14138 | Channel_type* channel_type = this->channel_->type()->channel_type(); |
14139 | if (channel_type == NULL) | |
e429e3bd | 14140 | { |
14141 | this->report_error(_("expected channel")); | |
14142 | return Type::make_error_type(); | |
14143 | } | |
e440a328 | 14144 | return channel_type->element_type(); |
14145 | } | |
14146 | ||
14147 | // Check types for a receive expression. | |
14148 | ||
14149 | void | |
14150 | Receive_expression::do_check_types(Gogo*) | |
14151 | { | |
14152 | Type* type = this->channel_->type(); | |
5c13bd80 | 14153 | if (type->is_error()) |
e440a328 | 14154 | { |
e429e3bd | 14155 | go_assert(saw_errors()); |
e440a328 | 14156 | this->set_is_error(); |
14157 | return; | |
14158 | } | |
14159 | if (type->channel_type() == NULL) | |
14160 | { | |
14161 | this->report_error(_("expected channel")); | |
14162 | return; | |
14163 | } | |
14164 | if (!type->channel_type()->may_receive()) | |
14165 | { | |
14166 | this->report_error(_("invalid receive on send-only channel")); | |
14167 | return; | |
14168 | } | |
14169 | } | |
14170 | ||
2c809f8f | 14171 | // Flattening for receive expressions creates a temporary variable to store |
14172 | // received data in for receives. | |
14173 | ||
14174 | Expression* | |
14175 | Receive_expression::do_flatten(Gogo*, Named_object*, | |
14176 | Statement_inserter* inserter) | |
14177 | { | |
14178 | Channel_type* channel_type = this->channel_->type()->channel_type(); | |
14179 | if (channel_type == NULL) | |
14180 | { | |
14181 | go_assert(saw_errors()); | |
14182 | return this; | |
14183 | } | |
5bf8be8b | 14184 | else if (this->channel_->is_error_expression()) |
14185 | { | |
14186 | go_assert(saw_errors()); | |
14187 | return Expression::make_error(this->location()); | |
14188 | } | |
2c809f8f | 14189 | |
14190 | Type* element_type = channel_type->element_type(); | |
14191 | if (this->temp_receiver_ == NULL) | |
14192 | { | |
14193 | this->temp_receiver_ = Statement::make_temporary(element_type, NULL, | |
14194 | this->location()); | |
14195 | this->temp_receiver_->set_is_address_taken(); | |
14196 | inserter->insert(this->temp_receiver_); | |
14197 | } | |
14198 | ||
14199 | return this; | |
14200 | } | |
14201 | ||
ea664253 | 14202 | // Get the backend representation for a receive expression. |
e440a328 | 14203 | |
ea664253 | 14204 | Bexpression* |
14205 | Receive_expression::do_get_backend(Translate_context* context) | |
e440a328 | 14206 | { |
f24f10bb | 14207 | Location loc = this->location(); |
14208 | ||
e440a328 | 14209 | Channel_type* channel_type = this->channel_->type()->channel_type(); |
5b8368f4 | 14210 | if (channel_type == NULL) |
14211 | { | |
c484d925 | 14212 | go_assert(this->channel_->type()->is_error()); |
ea664253 | 14213 | return context->backend()->error_expression(); |
5b8368f4 | 14214 | } |
f24f10bb | 14215 | Expression* td = Expression::make_type_descriptor(channel_type, loc); |
e440a328 | 14216 | |
2c809f8f | 14217 | Expression* recv_ref = |
14218 | Expression::make_temporary_reference(this->temp_receiver_, loc); | |
14219 | Expression* recv_addr = | |
14220 | Expression::make_temporary_reference(this->temp_receiver_, loc); | |
14221 | recv_addr = Expression::make_unary(OPERATOR_AND, recv_addr, loc); | |
132ed071 | 14222 | Expression* recv = Runtime::make_call(Runtime::CHANRECV1, loc, 3, |
14223 | td, this->channel_, recv_addr); | |
ea664253 | 14224 | return Expression::make_compound(recv, recv_ref, loc)->get_backend(context); |
e440a328 | 14225 | } |
14226 | ||
d751bb78 | 14227 | // Dump ast representation for a receive expression. |
14228 | ||
14229 | void | |
14230 | Receive_expression::do_dump_expression(Ast_dump_context* ast_dump_context) const | |
14231 | { | |
14232 | ast_dump_context->ostream() << " <- " ; | |
14233 | ast_dump_context->dump_expression(channel_); | |
14234 | } | |
14235 | ||
e440a328 | 14236 | // Make a receive expression. |
14237 | ||
14238 | Receive_expression* | |
b13c66cd | 14239 | Expression::make_receive(Expression* channel, Location location) |
e440a328 | 14240 | { |
14241 | return new Receive_expression(channel, location); | |
14242 | } | |
14243 | ||
e440a328 | 14244 | // An expression which evaluates to a pointer to the type descriptor |
14245 | // of a type. | |
14246 | ||
14247 | class Type_descriptor_expression : public Expression | |
14248 | { | |
14249 | public: | |
b13c66cd | 14250 | Type_descriptor_expression(Type* type, Location location) |
e440a328 | 14251 | : Expression(EXPRESSION_TYPE_DESCRIPTOR, location), |
14252 | type_(type) | |
14253 | { } | |
14254 | ||
14255 | protected: | |
4b686186 | 14256 | int |
14257 | do_traverse(Traverse*); | |
14258 | ||
e440a328 | 14259 | Type* |
14260 | do_type() | |
14261 | { return Type::make_type_descriptor_ptr_type(); } | |
14262 | ||
f9ca30f9 | 14263 | bool |
3ae06f68 | 14264 | do_is_static_initializer() const |
f9ca30f9 | 14265 | { return true; } |
14266 | ||
e440a328 | 14267 | void |
14268 | do_determine_type(const Type_context*) | |
14269 | { } | |
14270 | ||
14271 | Expression* | |
14272 | do_copy() | |
14273 | { return this; } | |
14274 | ||
ea664253 | 14275 | Bexpression* |
14276 | do_get_backend(Translate_context* context) | |
a1d23b41 | 14277 | { |
ea664253 | 14278 | return this->type_->type_descriptor_pointer(context->gogo(), |
14279 | this->location()); | |
a1d23b41 | 14280 | } |
e440a328 | 14281 | |
d751bb78 | 14282 | void |
14283 | do_dump_expression(Ast_dump_context*) const; | |
14284 | ||
e440a328 | 14285 | private: |
14286 | // The type for which this is the descriptor. | |
14287 | Type* type_; | |
14288 | }; | |
14289 | ||
4b686186 | 14290 | int |
14291 | Type_descriptor_expression::do_traverse(Traverse* traverse) | |
14292 | { | |
14293 | if (Type::traverse(this->type_, traverse) == TRAVERSE_EXIT) | |
14294 | return TRAVERSE_EXIT; | |
14295 | return TRAVERSE_CONTINUE; | |
14296 | } | |
14297 | ||
d751bb78 | 14298 | // Dump ast representation for a type descriptor expression. |
14299 | ||
14300 | void | |
14301 | Type_descriptor_expression::do_dump_expression( | |
14302 | Ast_dump_context* ast_dump_context) const | |
14303 | { | |
14304 | ast_dump_context->dump_type(this->type_); | |
14305 | } | |
14306 | ||
e440a328 | 14307 | // Make a type descriptor expression. |
14308 | ||
14309 | Expression* | |
b13c66cd | 14310 | Expression::make_type_descriptor(Type* type, Location location) |
e440a328 | 14311 | { |
14312 | return new Type_descriptor_expression(type, location); | |
14313 | } | |
14314 | ||
aa5ae575 | 14315 | // An expression which evaluates to a pointer to the Garbage Collection symbol |
14316 | // of a type. | |
14317 | ||
14318 | class GC_symbol_expression : public Expression | |
14319 | { | |
14320 | public: | |
14321 | GC_symbol_expression(Type* type) | |
14322 | : Expression(EXPRESSION_GC_SYMBOL, Linemap::predeclared_location()), | |
14323 | type_(type) | |
14324 | {} | |
14325 | ||
14326 | protected: | |
14327 | Type* | |
14328 | do_type() | |
23d77f91 | 14329 | { return Type::lookup_integer_type("uintptr"); } |
aa5ae575 | 14330 | |
14331 | bool | |
3ae06f68 | 14332 | do_is_static_initializer() const |
aa5ae575 | 14333 | { return true; } |
14334 | ||
14335 | void | |
14336 | do_determine_type(const Type_context*) | |
14337 | { } | |
14338 | ||
14339 | Expression* | |
14340 | do_copy() | |
14341 | { return this; } | |
14342 | ||
14343 | Bexpression* | |
14344 | do_get_backend(Translate_context* context) | |
14345 | { return this->type_->gc_symbol_pointer(context->gogo()); } | |
14346 | ||
14347 | void | |
14348 | do_dump_expression(Ast_dump_context*) const; | |
14349 | ||
14350 | private: | |
14351 | // The type which this gc symbol describes. | |
14352 | Type* type_; | |
14353 | }; | |
14354 | ||
14355 | // Dump ast representation for a gc symbol expression. | |
14356 | ||
14357 | void | |
14358 | GC_symbol_expression::do_dump_expression( | |
14359 | Ast_dump_context* ast_dump_context) const | |
14360 | { | |
14361 | ast_dump_context->ostream() << "gcdata("; | |
14362 | ast_dump_context->dump_type(this->type_); | |
14363 | ast_dump_context->ostream() << ")"; | |
14364 | } | |
14365 | ||
14366 | // Make a gc symbol expression. | |
14367 | ||
14368 | Expression* | |
14369 | Expression::make_gc_symbol(Type* type) | |
14370 | { | |
14371 | return new GC_symbol_expression(type); | |
14372 | } | |
14373 | ||
e440a328 | 14374 | // An expression which evaluates to some characteristic of a type. |
14375 | // This is only used to initialize fields of a type descriptor. Using | |
14376 | // a new expression class is slightly inefficient but gives us a good | |
14377 | // separation between the frontend and the middle-end with regard to | |
14378 | // how types are laid out. | |
14379 | ||
14380 | class Type_info_expression : public Expression | |
14381 | { | |
14382 | public: | |
14383 | Type_info_expression(Type* type, Type_info type_info) | |
b13c66cd | 14384 | : Expression(EXPRESSION_TYPE_INFO, Linemap::predeclared_location()), |
e440a328 | 14385 | type_(type), type_info_(type_info) |
14386 | { } | |
14387 | ||
14388 | protected: | |
0e168074 | 14389 | bool |
3ae06f68 | 14390 | do_is_static_initializer() const |
0e168074 | 14391 | { return true; } |
14392 | ||
e440a328 | 14393 | Type* |
14394 | do_type(); | |
14395 | ||
14396 | void | |
14397 | do_determine_type(const Type_context*) | |
14398 | { } | |
14399 | ||
14400 | Expression* | |
14401 | do_copy() | |
14402 | { return this; } | |
14403 | ||
ea664253 | 14404 | Bexpression* |
14405 | do_get_backend(Translate_context* context); | |
e440a328 | 14406 | |
d751bb78 | 14407 | void |
14408 | do_dump_expression(Ast_dump_context*) const; | |
14409 | ||
e440a328 | 14410 | private: |
14411 | // The type for which we are getting information. | |
14412 | Type* type_; | |
14413 | // What information we want. | |
14414 | Type_info type_info_; | |
14415 | }; | |
14416 | ||
14417 | // The type is chosen to match what the type descriptor struct | |
14418 | // expects. | |
14419 | ||
14420 | Type* | |
14421 | Type_info_expression::do_type() | |
14422 | { | |
14423 | switch (this->type_info_) | |
14424 | { | |
14425 | case TYPE_INFO_SIZE: | |
14426 | return Type::lookup_integer_type("uintptr"); | |
14427 | case TYPE_INFO_ALIGNMENT: | |
14428 | case TYPE_INFO_FIELD_ALIGNMENT: | |
14429 | return Type::lookup_integer_type("uint8"); | |
14430 | default: | |
c3e6f413 | 14431 | go_unreachable(); |
e440a328 | 14432 | } |
14433 | } | |
14434 | ||
ea664253 | 14435 | // Return the backend representation for type information. |
e440a328 | 14436 | |
ea664253 | 14437 | Bexpression* |
14438 | Type_info_expression::do_get_backend(Translate_context* context) | |
e440a328 | 14439 | { |
927a01eb | 14440 | Gogo* gogo = context->gogo(); |
2a305b85 | 14441 | bool ok = true; |
3f378015 | 14442 | int64_t val; |
927a01eb | 14443 | switch (this->type_info_) |
e440a328 | 14444 | { |
927a01eb | 14445 | case TYPE_INFO_SIZE: |
2a305b85 | 14446 | ok = this->type_->backend_type_size(gogo, &val); |
927a01eb | 14447 | break; |
14448 | case TYPE_INFO_ALIGNMENT: | |
2a305b85 | 14449 | ok = this->type_->backend_type_align(gogo, &val); |
927a01eb | 14450 | break; |
14451 | case TYPE_INFO_FIELD_ALIGNMENT: | |
2a305b85 | 14452 | ok = this->type_->backend_type_field_align(gogo, &val); |
927a01eb | 14453 | break; |
14454 | default: | |
14455 | go_unreachable(); | |
e440a328 | 14456 | } |
2a305b85 | 14457 | if (!ok) |
14458 | { | |
14459 | go_assert(saw_errors()); | |
14460 | return gogo->backend()->error_expression(); | |
14461 | } | |
3f378015 | 14462 | Expression* e = Expression::make_integer_int64(val, this->type(), |
14463 | this->location()); | |
14464 | return e->get_backend(context); | |
e440a328 | 14465 | } |
14466 | ||
d751bb78 | 14467 | // Dump ast representation for a type info expression. |
14468 | ||
14469 | void | |
14470 | Type_info_expression::do_dump_expression( | |
14471 | Ast_dump_context* ast_dump_context) const | |
14472 | { | |
14473 | ast_dump_context->ostream() << "typeinfo("; | |
14474 | ast_dump_context->dump_type(this->type_); | |
14475 | ast_dump_context->ostream() << ","; | |
14476 | ast_dump_context->ostream() << | |
14477 | (this->type_info_ == TYPE_INFO_ALIGNMENT ? "alignment" | |
14478 | : this->type_info_ == TYPE_INFO_FIELD_ALIGNMENT ? "field alignment" | |
14479 | : this->type_info_ == TYPE_INFO_SIZE ? "size " | |
14480 | : "unknown"); | |
14481 | ast_dump_context->ostream() << ")"; | |
14482 | } | |
14483 | ||
e440a328 | 14484 | // Make a type info expression. |
14485 | ||
14486 | Expression* | |
14487 | Expression::make_type_info(Type* type, Type_info type_info) | |
14488 | { | |
14489 | return new Type_info_expression(type, type_info); | |
14490 | } | |
14491 | ||
35a54f17 | 14492 | // An expression that evaluates to some characteristic of a slice. |
14493 | // This is used when indexing, bound-checking, or nil checking a slice. | |
14494 | ||
14495 | class Slice_info_expression : public Expression | |
14496 | { | |
14497 | public: | |
14498 | Slice_info_expression(Expression* slice, Slice_info slice_info, | |
14499 | Location location) | |
14500 | : Expression(EXPRESSION_SLICE_INFO, location), | |
14501 | slice_(slice), slice_info_(slice_info) | |
14502 | { } | |
14503 | ||
14504 | protected: | |
14505 | Type* | |
14506 | do_type(); | |
14507 | ||
14508 | void | |
14509 | do_determine_type(const Type_context*) | |
14510 | { } | |
14511 | ||
14512 | Expression* | |
14513 | do_copy() | |
14514 | { | |
14515 | return new Slice_info_expression(this->slice_->copy(), this->slice_info_, | |
14516 | this->location()); | |
14517 | } | |
14518 | ||
ea664253 | 14519 | Bexpression* |
14520 | do_get_backend(Translate_context* context); | |
35a54f17 | 14521 | |
14522 | void | |
14523 | do_dump_expression(Ast_dump_context*) const; | |
14524 | ||
14525 | void | |
14526 | do_issue_nil_check() | |
14527 | { this->slice_->issue_nil_check(); } | |
14528 | ||
14529 | private: | |
14530 | // The slice for which we are getting information. | |
14531 | Expression* slice_; | |
14532 | // What information we want. | |
14533 | Slice_info slice_info_; | |
14534 | }; | |
14535 | ||
14536 | // Return the type of the slice info. | |
14537 | ||
14538 | Type* | |
14539 | Slice_info_expression::do_type() | |
14540 | { | |
14541 | switch (this->slice_info_) | |
14542 | { | |
14543 | case SLICE_INFO_VALUE_POINTER: | |
14544 | return Type::make_pointer_type( | |
14545 | this->slice_->type()->array_type()->element_type()); | |
14546 | case SLICE_INFO_LENGTH: | |
14547 | case SLICE_INFO_CAPACITY: | |
14548 | return Type::lookup_integer_type("int"); | |
14549 | default: | |
14550 | go_unreachable(); | |
14551 | } | |
14552 | } | |
14553 | ||
ea664253 | 14554 | // Return the backend information for slice information. |
35a54f17 | 14555 | |
ea664253 | 14556 | Bexpression* |
14557 | Slice_info_expression::do_get_backend(Translate_context* context) | |
35a54f17 | 14558 | { |
14559 | Gogo* gogo = context->gogo(); | |
ea664253 | 14560 | Bexpression* bslice = this->slice_->get_backend(context); |
35a54f17 | 14561 | switch (this->slice_info_) |
14562 | { | |
14563 | case SLICE_INFO_VALUE_POINTER: | |
14564 | case SLICE_INFO_LENGTH: | |
14565 | case SLICE_INFO_CAPACITY: | |
ea664253 | 14566 | return gogo->backend()->struct_field_expression(bslice, this->slice_info_, |
14567 | this->location()); | |
35a54f17 | 14568 | break; |
14569 | default: | |
14570 | go_unreachable(); | |
14571 | } | |
35a54f17 | 14572 | } |
14573 | ||
14574 | // Dump ast representation for a type info expression. | |
14575 | ||
14576 | void | |
14577 | Slice_info_expression::do_dump_expression( | |
14578 | Ast_dump_context* ast_dump_context) const | |
14579 | { | |
14580 | ast_dump_context->ostream() << "sliceinfo("; | |
14581 | this->slice_->dump_expression(ast_dump_context); | |
14582 | ast_dump_context->ostream() << ","; | |
14583 | ast_dump_context->ostream() << | |
14584 | (this->slice_info_ == SLICE_INFO_VALUE_POINTER ? "values" | |
14585 | : this->slice_info_ == SLICE_INFO_LENGTH ? "length" | |
14586 | : this->slice_info_ == SLICE_INFO_CAPACITY ? "capacity " | |
14587 | : "unknown"); | |
14588 | ast_dump_context->ostream() << ")"; | |
14589 | } | |
14590 | ||
14591 | // Make a slice info expression. | |
14592 | ||
14593 | Expression* | |
14594 | Expression::make_slice_info(Expression* slice, Slice_info slice_info, | |
14595 | Location location) | |
14596 | { | |
14597 | return new Slice_info_expression(slice, slice_info, location); | |
14598 | } | |
14599 | ||
2c809f8f | 14600 | // An expression that represents a slice value: a struct with value pointer, |
14601 | // length, and capacity fields. | |
14602 | ||
14603 | class Slice_value_expression : public Expression | |
14604 | { | |
14605 | public: | |
14606 | Slice_value_expression(Type* type, Expression* valptr, Expression* len, | |
14607 | Expression* cap, Location location) | |
14608 | : Expression(EXPRESSION_SLICE_VALUE, location), | |
14609 | type_(type), valptr_(valptr), len_(len), cap_(cap) | |
14610 | { } | |
14611 | ||
14612 | protected: | |
14613 | int | |
14614 | do_traverse(Traverse*); | |
14615 | ||
14616 | Type* | |
14617 | do_type() | |
14618 | { return this->type_; } | |
14619 | ||
14620 | void | |
14621 | do_determine_type(const Type_context*) | |
14622 | { go_unreachable(); } | |
14623 | ||
14624 | Expression* | |
14625 | do_copy() | |
14626 | { | |
14627 | return new Slice_value_expression(this->type_, this->valptr_->copy(), | |
14628 | this->len_->copy(), this->cap_->copy(), | |
14629 | this->location()); | |
14630 | } | |
14631 | ||
ea664253 | 14632 | Bexpression* |
14633 | do_get_backend(Translate_context* context); | |
2c809f8f | 14634 | |
14635 | void | |
14636 | do_dump_expression(Ast_dump_context*) const; | |
14637 | ||
14638 | private: | |
14639 | // The type of the slice value. | |
14640 | Type* type_; | |
14641 | // The pointer to the values in the slice. | |
14642 | Expression* valptr_; | |
14643 | // The length of the slice. | |
14644 | Expression* len_; | |
14645 | // The capacity of the slice. | |
14646 | Expression* cap_; | |
14647 | }; | |
14648 | ||
14649 | int | |
14650 | Slice_value_expression::do_traverse(Traverse* traverse) | |
14651 | { | |
55e8ba6a | 14652 | if (Type::traverse(this->type_, traverse) == TRAVERSE_EXIT |
14653 | || Expression::traverse(&this->valptr_, traverse) == TRAVERSE_EXIT | |
2c809f8f | 14654 | || Expression::traverse(&this->len_, traverse) == TRAVERSE_EXIT |
14655 | || Expression::traverse(&this->cap_, traverse) == TRAVERSE_EXIT) | |
14656 | return TRAVERSE_EXIT; | |
14657 | return TRAVERSE_CONTINUE; | |
14658 | } | |
14659 | ||
ea664253 | 14660 | Bexpression* |
14661 | Slice_value_expression::do_get_backend(Translate_context* context) | |
2c809f8f | 14662 | { |
14663 | std::vector<Bexpression*> vals(3); | |
ea664253 | 14664 | vals[0] = this->valptr_->get_backend(context); |
14665 | vals[1] = this->len_->get_backend(context); | |
14666 | vals[2] = this->cap_->get_backend(context); | |
2c809f8f | 14667 | |
14668 | Gogo* gogo = context->gogo(); | |
14669 | Btype* btype = this->type_->get_backend(gogo); | |
ea664253 | 14670 | return gogo->backend()->constructor_expression(btype, vals, this->location()); |
2c809f8f | 14671 | } |
14672 | ||
14673 | void | |
14674 | Slice_value_expression::do_dump_expression( | |
14675 | Ast_dump_context* ast_dump_context) const | |
14676 | { | |
14677 | ast_dump_context->ostream() << "slicevalue("; | |
14678 | ast_dump_context->ostream() << "values: "; | |
14679 | this->valptr_->dump_expression(ast_dump_context); | |
14680 | ast_dump_context->ostream() << ", length: "; | |
14681 | this->len_->dump_expression(ast_dump_context); | |
14682 | ast_dump_context->ostream() << ", capacity: "; | |
14683 | this->cap_->dump_expression(ast_dump_context); | |
14684 | ast_dump_context->ostream() << ")"; | |
14685 | } | |
14686 | ||
14687 | Expression* | |
14688 | Expression::make_slice_value(Type* at, Expression* valptr, Expression* len, | |
14689 | Expression* cap, Location location) | |
14690 | { | |
14691 | go_assert(at->is_slice_type()); | |
14692 | return new Slice_value_expression(at, valptr, len, cap, location); | |
14693 | } | |
2387f644 | 14694 | |
14695 | // An expression that evaluates to some characteristic of a non-empty interface. | |
14696 | // This is used to access the method table or underlying object of an interface. | |
14697 | ||
14698 | class Interface_info_expression : public Expression | |
14699 | { | |
14700 | public: | |
14701 | Interface_info_expression(Expression* iface, Interface_info iface_info, | |
2c809f8f | 14702 | Location location) |
2387f644 | 14703 | : Expression(EXPRESSION_INTERFACE_INFO, location), |
14704 | iface_(iface), iface_info_(iface_info) | |
14705 | { } | |
14706 | ||
14707 | protected: | |
14708 | Type* | |
14709 | do_type(); | |
14710 | ||
14711 | void | |
14712 | do_determine_type(const Type_context*) | |
14713 | { } | |
14714 | ||
14715 | Expression* | |
14716 | do_copy() | |
14717 | { | |
14718 | return new Interface_info_expression(this->iface_->copy(), | |
14719 | this->iface_info_, this->location()); | |
14720 | } | |
14721 | ||
ea664253 | 14722 | Bexpression* |
14723 | do_get_backend(Translate_context* context); | |
2387f644 | 14724 | |
14725 | void | |
14726 | do_dump_expression(Ast_dump_context*) const; | |
14727 | ||
14728 | void | |
14729 | do_issue_nil_check() | |
14730 | { this->iface_->issue_nil_check(); } | |
14731 | ||
14732 | private: | |
14733 | // The interface for which we are getting information. | |
14734 | Expression* iface_; | |
14735 | // What information we want. | |
14736 | Interface_info iface_info_; | |
14737 | }; | |
14738 | ||
14739 | // Return the type of the interface info. | |
14740 | ||
14741 | Type* | |
14742 | Interface_info_expression::do_type() | |
14743 | { | |
14744 | switch (this->iface_info_) | |
14745 | { | |
14746 | case INTERFACE_INFO_METHODS: | |
14747 | { | |
625d3118 | 14748 | typedef Unordered_map(Interface_type*, Type*) Hashtable; |
14749 | static Hashtable result_types; | |
14750 | ||
14751 | Interface_type* itype = this->iface_->type()->interface_type(); | |
14752 | ||
14753 | Hashtable::const_iterator p = result_types.find(itype); | |
14754 | if (p != result_types.end()) | |
14755 | return p->second; | |
14756 | ||
2c809f8f | 14757 | Type* pdt = Type::make_type_descriptor_ptr_type(); |
625d3118 | 14758 | if (itype->is_empty()) |
14759 | { | |
14760 | result_types[itype] = pdt; | |
14761 | return pdt; | |
14762 | } | |
2c809f8f | 14763 | |
2387f644 | 14764 | Location loc = this->location(); |
14765 | Struct_field_list* sfl = new Struct_field_list(); | |
2387f644 | 14766 | sfl->push_back( |
14767 | Struct_field(Typed_identifier("__type_descriptor", pdt, loc))); | |
14768 | ||
2387f644 | 14769 | for (Typed_identifier_list::const_iterator p = itype->methods()->begin(); |
14770 | p != itype->methods()->end(); | |
14771 | ++p) | |
14772 | { | |
14773 | Function_type* ft = p->type()->function_type(); | |
14774 | go_assert(ft->receiver() == NULL); | |
14775 | ||
14776 | const Typed_identifier_list* params = ft->parameters(); | |
14777 | Typed_identifier_list* mparams = new Typed_identifier_list(); | |
14778 | if (params != NULL) | |
14779 | mparams->reserve(params->size() + 1); | |
14780 | Type* vt = Type::make_pointer_type(Type::make_void_type()); | |
14781 | mparams->push_back(Typed_identifier("", vt, ft->location())); | |
14782 | if (params != NULL) | |
14783 | { | |
14784 | for (Typed_identifier_list::const_iterator pp = params->begin(); | |
14785 | pp != params->end(); | |
14786 | ++pp) | |
14787 | mparams->push_back(*pp); | |
14788 | } | |
14789 | ||
14790 | Typed_identifier_list* mresults = (ft->results() == NULL | |
14791 | ? NULL | |
14792 | : ft->results()->copy()); | |
14793 | Backend_function_type* mft = | |
14794 | Type::make_backend_function_type(NULL, mparams, mresults, | |
14795 | ft->location()); | |
14796 | ||
14797 | std::string fname = Gogo::unpack_hidden_name(p->name()); | |
14798 | sfl->push_back(Struct_field(Typed_identifier(fname, mft, loc))); | |
14799 | } | |
14800 | ||
625d3118 | 14801 | Pointer_type *pt = Type::make_pointer_type(Type::make_struct_type(sfl, loc)); |
14802 | result_types[itype] = pt; | |
14803 | return pt; | |
2387f644 | 14804 | } |
14805 | case INTERFACE_INFO_OBJECT: | |
14806 | return Type::make_pointer_type(Type::make_void_type()); | |
14807 | default: | |
14808 | go_unreachable(); | |
14809 | } | |
14810 | } | |
14811 | ||
ea664253 | 14812 | // Return the backend representation for interface information. |
2387f644 | 14813 | |
ea664253 | 14814 | Bexpression* |
14815 | Interface_info_expression::do_get_backend(Translate_context* context) | |
2387f644 | 14816 | { |
14817 | Gogo* gogo = context->gogo(); | |
ea664253 | 14818 | Bexpression* biface = this->iface_->get_backend(context); |
2387f644 | 14819 | switch (this->iface_info_) |
14820 | { | |
14821 | case INTERFACE_INFO_METHODS: | |
14822 | case INTERFACE_INFO_OBJECT: | |
ea664253 | 14823 | return gogo->backend()->struct_field_expression(biface, this->iface_info_, |
14824 | this->location()); | |
2387f644 | 14825 | break; |
14826 | default: | |
14827 | go_unreachable(); | |
14828 | } | |
2387f644 | 14829 | } |
14830 | ||
14831 | // Dump ast representation for an interface info expression. | |
14832 | ||
14833 | void | |
14834 | Interface_info_expression::do_dump_expression( | |
14835 | Ast_dump_context* ast_dump_context) const | |
14836 | { | |
2c809f8f | 14837 | bool is_empty = this->iface_->type()->interface_type()->is_empty(); |
2387f644 | 14838 | ast_dump_context->ostream() << "interfaceinfo("; |
14839 | this->iface_->dump_expression(ast_dump_context); | |
14840 | ast_dump_context->ostream() << ","; | |
14841 | ast_dump_context->ostream() << | |
2c809f8f | 14842 | (this->iface_info_ == INTERFACE_INFO_METHODS && !is_empty ? "methods" |
14843 | : this->iface_info_ == INTERFACE_INFO_TYPE_DESCRIPTOR ? "type_descriptor" | |
2387f644 | 14844 | : this->iface_info_ == INTERFACE_INFO_OBJECT ? "object" |
14845 | : "unknown"); | |
14846 | ast_dump_context->ostream() << ")"; | |
14847 | } | |
14848 | ||
14849 | // Make an interface info expression. | |
14850 | ||
14851 | Expression* | |
14852 | Expression::make_interface_info(Expression* iface, Interface_info iface_info, | |
14853 | Location location) | |
14854 | { | |
14855 | return new Interface_info_expression(iface, iface_info, location); | |
14856 | } | |
14857 | ||
2c809f8f | 14858 | // An expression that represents an interface value. The first field is either |
14859 | // a type descriptor for an empty interface or a pointer to the interface method | |
14860 | // table for a non-empty interface. The second field is always the object. | |
14861 | ||
14862 | class Interface_value_expression : public Expression | |
14863 | { | |
14864 | public: | |
14865 | Interface_value_expression(Type* type, Expression* first_field, | |
14866 | Expression* obj, Location location) | |
14867 | : Expression(EXPRESSION_INTERFACE_VALUE, location), | |
14868 | type_(type), first_field_(first_field), obj_(obj) | |
14869 | { } | |
14870 | ||
14871 | protected: | |
14872 | int | |
14873 | do_traverse(Traverse*); | |
14874 | ||
14875 | Type* | |
14876 | do_type() | |
14877 | { return this->type_; } | |
14878 | ||
14879 | void | |
14880 | do_determine_type(const Type_context*) | |
14881 | { go_unreachable(); } | |
14882 | ||
14883 | Expression* | |
14884 | do_copy() | |
14885 | { | |
14886 | return new Interface_value_expression(this->type_, | |
14887 | this->first_field_->copy(), | |
14888 | this->obj_->copy(), this->location()); | |
14889 | } | |
14890 | ||
ea664253 | 14891 | Bexpression* |
14892 | do_get_backend(Translate_context* context); | |
2c809f8f | 14893 | |
14894 | void | |
14895 | do_dump_expression(Ast_dump_context*) const; | |
14896 | ||
14897 | private: | |
14898 | // The type of the interface value. | |
14899 | Type* type_; | |
14900 | // The first field of the interface (either a type descriptor or a pointer | |
14901 | // to the method table. | |
14902 | Expression* first_field_; | |
14903 | // The underlying object of the interface. | |
14904 | Expression* obj_; | |
14905 | }; | |
14906 | ||
14907 | int | |
14908 | Interface_value_expression::do_traverse(Traverse* traverse) | |
14909 | { | |
14910 | if (Expression::traverse(&this->first_field_, traverse) == TRAVERSE_EXIT | |
14911 | || Expression::traverse(&this->obj_, traverse) == TRAVERSE_EXIT) | |
14912 | return TRAVERSE_EXIT; | |
14913 | return TRAVERSE_CONTINUE; | |
14914 | } | |
14915 | ||
ea664253 | 14916 | Bexpression* |
14917 | Interface_value_expression::do_get_backend(Translate_context* context) | |
2c809f8f | 14918 | { |
14919 | std::vector<Bexpression*> vals(2); | |
ea664253 | 14920 | vals[0] = this->first_field_->get_backend(context); |
14921 | vals[1] = this->obj_->get_backend(context); | |
2c809f8f | 14922 | |
14923 | Gogo* gogo = context->gogo(); | |
14924 | Btype* btype = this->type_->get_backend(gogo); | |
ea664253 | 14925 | return gogo->backend()->constructor_expression(btype, vals, this->location()); |
2c809f8f | 14926 | } |
14927 | ||
14928 | void | |
14929 | Interface_value_expression::do_dump_expression( | |
14930 | Ast_dump_context* ast_dump_context) const | |
14931 | { | |
14932 | ast_dump_context->ostream() << "interfacevalue("; | |
14933 | ast_dump_context->ostream() << | |
14934 | (this->type_->interface_type()->is_empty() | |
14935 | ? "type_descriptor: " | |
14936 | : "methods: "); | |
14937 | this->first_field_->dump_expression(ast_dump_context); | |
14938 | ast_dump_context->ostream() << ", object: "; | |
14939 | this->obj_->dump_expression(ast_dump_context); | |
14940 | ast_dump_context->ostream() << ")"; | |
14941 | } | |
14942 | ||
14943 | Expression* | |
14944 | Expression::make_interface_value(Type* type, Expression* first_value, | |
14945 | Expression* object, Location location) | |
14946 | { | |
14947 | return new Interface_value_expression(type, first_value, object, location); | |
14948 | } | |
14949 | ||
14950 | // An interface method table for a pair of types: an interface type and a type | |
14951 | // that implements that interface. | |
14952 | ||
14953 | class Interface_mtable_expression : public Expression | |
14954 | { | |
14955 | public: | |
14956 | Interface_mtable_expression(Interface_type* itype, Type* type, | |
14957 | bool is_pointer, Location location) | |
14958 | : Expression(EXPRESSION_INTERFACE_MTABLE, location), | |
14959 | itype_(itype), type_(type), is_pointer_(is_pointer), | |
14960 | method_table_type_(NULL), bvar_(NULL) | |
14961 | { } | |
14962 | ||
14963 | protected: | |
14964 | int | |
14965 | do_traverse(Traverse*); | |
14966 | ||
14967 | Type* | |
14968 | do_type(); | |
14969 | ||
14970 | bool | |
3ae06f68 | 14971 | do_is_static_initializer() const |
2c809f8f | 14972 | { return true; } |
14973 | ||
14974 | void | |
14975 | do_determine_type(const Type_context*) | |
14976 | { go_unreachable(); } | |
14977 | ||
14978 | Expression* | |
14979 | do_copy() | |
14980 | { | |
14981 | return new Interface_mtable_expression(this->itype_, this->type_, | |
14982 | this->is_pointer_, this->location()); | |
14983 | } | |
14984 | ||
14985 | bool | |
14986 | do_is_addressable() const | |
14987 | { return true; } | |
14988 | ||
ea664253 | 14989 | Bexpression* |
14990 | do_get_backend(Translate_context* context); | |
2c809f8f | 14991 | |
14992 | void | |
14993 | do_dump_expression(Ast_dump_context*) const; | |
14994 | ||
14995 | private: | |
14996 | // The interface type for which the methods are defined. | |
14997 | Interface_type* itype_; | |
14998 | // The type to construct the interface method table for. | |
14999 | Type* type_; | |
15000 | // Whether this table contains the method set for the receiver type or the | |
15001 | // pointer receiver type. | |
15002 | bool is_pointer_; | |
15003 | // The type of the method table. | |
15004 | Type* method_table_type_; | |
15005 | // The backend variable that refers to the interface method table. | |
15006 | Bvariable* bvar_; | |
15007 | }; | |
15008 | ||
15009 | int | |
15010 | Interface_mtable_expression::do_traverse(Traverse* traverse) | |
15011 | { | |
15012 | if (Type::traverse(this->itype_, traverse) == TRAVERSE_EXIT | |
15013 | || Type::traverse(this->type_, traverse) == TRAVERSE_EXIT) | |
15014 | return TRAVERSE_EXIT; | |
15015 | return TRAVERSE_CONTINUE; | |
15016 | } | |
15017 | ||
15018 | Type* | |
15019 | Interface_mtable_expression::do_type() | |
15020 | { | |
15021 | if (this->method_table_type_ != NULL) | |
15022 | return this->method_table_type_; | |
15023 | ||
15024 | const Typed_identifier_list* interface_methods = this->itype_->methods(); | |
15025 | go_assert(!interface_methods->empty()); | |
15026 | ||
15027 | Struct_field_list* sfl = new Struct_field_list; | |
15028 | Typed_identifier tid("__type_descriptor", Type::make_type_descriptor_ptr_type(), | |
15029 | this->location()); | |
15030 | sfl->push_back(Struct_field(tid)); | |
15031 | for (Typed_identifier_list::const_iterator p = interface_methods->begin(); | |
15032 | p != interface_methods->end(); | |
15033 | ++p) | |
15034 | sfl->push_back(Struct_field(*p)); | |
15035 | this->method_table_type_ = Type::make_struct_type(sfl, this->location()); | |
15036 | return this->method_table_type_; | |
15037 | } | |
15038 | ||
ea664253 | 15039 | Bexpression* |
15040 | Interface_mtable_expression::do_get_backend(Translate_context* context) | |
2c809f8f | 15041 | { |
15042 | Gogo* gogo = context->gogo(); | |
2c809f8f | 15043 | Location loc = Linemap::predeclared_location(); |
15044 | if (this->bvar_ != NULL) | |
ea664253 | 15045 | return gogo->backend()->var_expression(this->bvar_, this->location()); |
2c809f8f | 15046 | |
15047 | const Typed_identifier_list* interface_methods = this->itype_->methods(); | |
15048 | go_assert(!interface_methods->empty()); | |
15049 | ||
15050 | std::string mangled_name = ((this->is_pointer_ ? "__go_pimt__" : "__go_imt_") | |
15051 | + this->itype_->mangled_name(gogo) | |
15052 | + "__" | |
15053 | + this->type_->mangled_name(gogo)); | |
15054 | ||
15055 | // See whether this interface has any hidden methods. | |
15056 | bool has_hidden_methods = false; | |
15057 | for (Typed_identifier_list::const_iterator p = interface_methods->begin(); | |
15058 | p != interface_methods->end(); | |
15059 | ++p) | |
15060 | { | |
15061 | if (Gogo::is_hidden_name(p->name())) | |
15062 | { | |
15063 | has_hidden_methods = true; | |
15064 | break; | |
15065 | } | |
15066 | } | |
15067 | ||
15068 | // We already know that the named type is convertible to the | |
15069 | // interface. If the interface has hidden methods, and the named | |
15070 | // type is defined in a different package, then the interface | |
15071 | // conversion table will be defined by that other package. | |
15072 | if (has_hidden_methods | |
15073 | && this->type_->named_type() != NULL | |
15074 | && this->type_->named_type()->named_object()->package() != NULL) | |
15075 | { | |
15076 | Btype* btype = this->type()->get_backend(gogo); | |
15077 | this->bvar_ = | |
15078 | gogo->backend()->immutable_struct_reference(mangled_name, btype, loc); | |
ea664253 | 15079 | return gogo->backend()->var_expression(this->bvar_, this->location()); |
2c809f8f | 15080 | } |
15081 | ||
15082 | // The first element is the type descriptor. | |
15083 | Type* td_type; | |
15084 | if (!this->is_pointer_) | |
15085 | td_type = this->type_; | |
15086 | else | |
15087 | td_type = Type::make_pointer_type(this->type_); | |
15088 | ||
15089 | // Build an interface method table for a type: a type descriptor followed by a | |
15090 | // list of function pointers, one for each interface method. This is used for | |
15091 | // interfaces. | |
15092 | Expression_list* svals = new Expression_list(); | |
15093 | svals->push_back(Expression::make_type_descriptor(td_type, loc)); | |
15094 | ||
15095 | Named_type* nt = this->type_->named_type(); | |
15096 | Struct_type* st = this->type_->struct_type(); | |
15097 | go_assert(nt != NULL || st != NULL); | |
15098 | ||
15099 | for (Typed_identifier_list::const_iterator p = interface_methods->begin(); | |
15100 | p != interface_methods->end(); | |
15101 | ++p) | |
15102 | { | |
15103 | bool is_ambiguous; | |
15104 | Method* m; | |
15105 | if (nt != NULL) | |
15106 | m = nt->method_function(p->name(), &is_ambiguous); | |
15107 | else | |
15108 | m = st->method_function(p->name(), &is_ambiguous); | |
15109 | go_assert(m != NULL); | |
15110 | Named_object* no = m->named_object(); | |
15111 | ||
15112 | go_assert(no->is_function() || no->is_function_declaration()); | |
15113 | svals->push_back(Expression::make_func_code_reference(no, loc)); | |
15114 | } | |
15115 | ||
15116 | Btype* btype = this->type()->get_backend(gogo); | |
15117 | Expression* mtable = Expression::make_struct_composite_literal(this->type(), | |
15118 | svals, loc); | |
ea664253 | 15119 | Bexpression* ctor = mtable->get_backend(context); |
2c809f8f | 15120 | |
15121 | bool is_public = has_hidden_methods && this->type_->named_type() != NULL; | |
15122 | this->bvar_ = gogo->backend()->immutable_struct(mangled_name, false, | |
15123 | !is_public, btype, loc); | |
15124 | gogo->backend()->immutable_struct_set_init(this->bvar_, mangled_name, false, | |
15125 | !is_public, btype, loc, ctor); | |
ea664253 | 15126 | return gogo->backend()->var_expression(this->bvar_, loc); |
2c809f8f | 15127 | } |
15128 | ||
15129 | void | |
15130 | Interface_mtable_expression::do_dump_expression( | |
15131 | Ast_dump_context* ast_dump_context) const | |
15132 | { | |
15133 | ast_dump_context->ostream() << "__go_" | |
15134 | << (this->is_pointer_ ? "pimt__" : "imt_"); | |
15135 | ast_dump_context->dump_type(this->itype_); | |
15136 | ast_dump_context->ostream() << "__"; | |
15137 | ast_dump_context->dump_type(this->type_); | |
15138 | } | |
15139 | ||
15140 | Expression* | |
15141 | Expression::make_interface_mtable_ref(Interface_type* itype, Type* type, | |
15142 | bool is_pointer, Location location) | |
15143 | { | |
15144 | return new Interface_mtable_expression(itype, type, is_pointer, location); | |
15145 | } | |
15146 | ||
e440a328 | 15147 | // An expression which evaluates to the offset of a field within a |
15148 | // struct. This, like Type_info_expression, q.v., is only used to | |
15149 | // initialize fields of a type descriptor. | |
15150 | ||
15151 | class Struct_field_offset_expression : public Expression | |
15152 | { | |
15153 | public: | |
15154 | Struct_field_offset_expression(Struct_type* type, const Struct_field* field) | |
b13c66cd | 15155 | : Expression(EXPRESSION_STRUCT_FIELD_OFFSET, |
15156 | Linemap::predeclared_location()), | |
e440a328 | 15157 | type_(type), field_(field) |
15158 | { } | |
15159 | ||
15160 | protected: | |
f23d7786 | 15161 | bool |
3ae06f68 | 15162 | do_is_static_initializer() const |
f23d7786 | 15163 | { return true; } |
15164 | ||
e440a328 | 15165 | Type* |
15166 | do_type() | |
15167 | { return Type::lookup_integer_type("uintptr"); } | |
15168 | ||
15169 | void | |
15170 | do_determine_type(const Type_context*) | |
15171 | { } | |
15172 | ||
15173 | Expression* | |
15174 | do_copy() | |
15175 | { return this; } | |
15176 | ||
ea664253 | 15177 | Bexpression* |
15178 | do_get_backend(Translate_context* context); | |
e440a328 | 15179 | |
d751bb78 | 15180 | void |
15181 | do_dump_expression(Ast_dump_context*) const; | |
15182 | ||
e440a328 | 15183 | private: |
15184 | // The type of the struct. | |
15185 | Struct_type* type_; | |
15186 | // The field. | |
15187 | const Struct_field* field_; | |
15188 | }; | |
15189 | ||
ea664253 | 15190 | // Return the backend representation for a struct field offset. |
e440a328 | 15191 | |
ea664253 | 15192 | Bexpression* |
15193 | Struct_field_offset_expression::do_get_backend(Translate_context* context) | |
e440a328 | 15194 | { |
e440a328 | 15195 | const Struct_field_list* fields = this->type_->fields(); |
e440a328 | 15196 | Struct_field_list::const_iterator p; |
2c8bda43 | 15197 | unsigned i = 0; |
e440a328 | 15198 | for (p = fields->begin(); |
15199 | p != fields->end(); | |
2c8bda43 | 15200 | ++p, ++i) |
15201 | if (&*p == this->field_) | |
15202 | break; | |
c484d925 | 15203 | go_assert(&*p == this->field_); |
e440a328 | 15204 | |
2c8bda43 | 15205 | Gogo* gogo = context->gogo(); |
15206 | Btype* btype = this->type_->get_backend(gogo); | |
15207 | ||
3f378015 | 15208 | int64_t offset = gogo->backend()->type_field_offset(btype, i); |
2c8bda43 | 15209 | Type* uptr_type = Type::lookup_integer_type("uintptr"); |
e67508fa | 15210 | Expression* ret = |
3f378015 | 15211 | Expression::make_integer_int64(offset, uptr_type, |
15212 | Linemap::predeclared_location()); | |
ea664253 | 15213 | return ret->get_backend(context); |
e440a328 | 15214 | } |
15215 | ||
d751bb78 | 15216 | // Dump ast representation for a struct field offset expression. |
15217 | ||
15218 | void | |
15219 | Struct_field_offset_expression::do_dump_expression( | |
15220 | Ast_dump_context* ast_dump_context) const | |
15221 | { | |
15222 | ast_dump_context->ostream() << "unsafe.Offsetof("; | |
2d29d278 | 15223 | ast_dump_context->dump_type(this->type_); |
15224 | ast_dump_context->ostream() << '.'; | |
15225 | ast_dump_context->ostream() << | |
15226 | Gogo::message_name(this->field_->field_name()); | |
d751bb78 | 15227 | ast_dump_context->ostream() << ")"; |
15228 | } | |
15229 | ||
e440a328 | 15230 | // Make an expression for a struct field offset. |
15231 | ||
15232 | Expression* | |
15233 | Expression::make_struct_field_offset(Struct_type* type, | |
15234 | const Struct_field* field) | |
15235 | { | |
15236 | return new Struct_field_offset_expression(type, field); | |
15237 | } | |
15238 | ||
15239 | // An expression which evaluates to the address of an unnamed label. | |
15240 | ||
15241 | class Label_addr_expression : public Expression | |
15242 | { | |
15243 | public: | |
b13c66cd | 15244 | Label_addr_expression(Label* label, Location location) |
e440a328 | 15245 | : Expression(EXPRESSION_LABEL_ADDR, location), |
15246 | label_(label) | |
15247 | { } | |
15248 | ||
15249 | protected: | |
15250 | Type* | |
15251 | do_type() | |
15252 | { return Type::make_pointer_type(Type::make_void_type()); } | |
15253 | ||
15254 | void | |
15255 | do_determine_type(const Type_context*) | |
15256 | { } | |
15257 | ||
15258 | Expression* | |
15259 | do_copy() | |
15260 | { return new Label_addr_expression(this->label_, this->location()); } | |
15261 | ||
ea664253 | 15262 | Bexpression* |
15263 | do_get_backend(Translate_context* context) | |
15264 | { return this->label_->get_addr(context, this->location()); } | |
e440a328 | 15265 | |
d751bb78 | 15266 | void |
15267 | do_dump_expression(Ast_dump_context* ast_dump_context) const | |
15268 | { ast_dump_context->ostream() << this->label_->name(); } | |
15269 | ||
e440a328 | 15270 | private: |
15271 | // The label whose address we are taking. | |
15272 | Label* label_; | |
15273 | }; | |
15274 | ||
15275 | // Make an expression for the address of an unnamed label. | |
15276 | ||
15277 | Expression* | |
b13c66cd | 15278 | Expression::make_label_addr(Label* label, Location location) |
e440a328 | 15279 | { |
15280 | return new Label_addr_expression(label, location); | |
15281 | } | |
15282 | ||
da244e59 | 15283 | // Class Conditional_expression. |
283a177b | 15284 | |
2c809f8f | 15285 | // Traversal. |
15286 | ||
15287 | int | |
15288 | Conditional_expression::do_traverse(Traverse* traverse) | |
15289 | { | |
15290 | if (Expression::traverse(&this->cond_, traverse) == TRAVERSE_EXIT | |
15291 | || Expression::traverse(&this->then_, traverse) == TRAVERSE_EXIT | |
15292 | || Expression::traverse(&this->else_, traverse) == TRAVERSE_EXIT) | |
15293 | return TRAVERSE_EXIT; | |
15294 | return TRAVERSE_CONTINUE; | |
15295 | } | |
15296 | ||
283a177b | 15297 | // Return the type of the conditional expression. |
15298 | ||
15299 | Type* | |
15300 | Conditional_expression::do_type() | |
15301 | { | |
15302 | Type* result_type = Type::make_void_type(); | |
2c809f8f | 15303 | if (Type::are_identical(this->then_->type(), this->else_->type(), false, |
15304 | NULL)) | |
283a177b | 15305 | result_type = this->then_->type(); |
15306 | else if (this->then_->is_nil_expression() | |
15307 | || this->else_->is_nil_expression()) | |
15308 | result_type = (!this->then_->is_nil_expression() | |
15309 | ? this->then_->type() | |
15310 | : this->else_->type()); | |
15311 | return result_type; | |
15312 | } | |
15313 | ||
2c809f8f | 15314 | // Determine type for a conditional expression. |
15315 | ||
15316 | void | |
15317 | Conditional_expression::do_determine_type(const Type_context* context) | |
15318 | { | |
15319 | this->cond_->determine_type_no_context(); | |
15320 | this->then_->determine_type(context); | |
15321 | this->else_->determine_type(context); | |
15322 | } | |
15323 | ||
283a177b | 15324 | // Get the backend representation of a conditional expression. |
15325 | ||
ea664253 | 15326 | Bexpression* |
15327 | Conditional_expression::do_get_backend(Translate_context* context) | |
283a177b | 15328 | { |
15329 | Gogo* gogo = context->gogo(); | |
15330 | Btype* result_btype = this->type()->get_backend(gogo); | |
ea664253 | 15331 | Bexpression* cond = this->cond_->get_backend(context); |
15332 | Bexpression* then = this->then_->get_backend(context); | |
15333 | Bexpression* belse = this->else_->get_backend(context); | |
15334 | return gogo->backend()->conditional_expression(result_btype, cond, then, | |
15335 | belse, this->location()); | |
283a177b | 15336 | } |
15337 | ||
15338 | // Dump ast representation of a conditional expression. | |
15339 | ||
15340 | void | |
15341 | Conditional_expression::do_dump_expression( | |
15342 | Ast_dump_context* ast_dump_context) const | |
15343 | { | |
15344 | ast_dump_context->ostream() << "("; | |
15345 | ast_dump_context->dump_expression(this->cond_); | |
15346 | ast_dump_context->ostream() << " ? "; | |
15347 | ast_dump_context->dump_expression(this->then_); | |
15348 | ast_dump_context->ostream() << " : "; | |
15349 | ast_dump_context->dump_expression(this->else_); | |
15350 | ast_dump_context->ostream() << ") "; | |
15351 | } | |
15352 | ||
15353 | // Make a conditional expression. | |
15354 | ||
15355 | Expression* | |
15356 | Expression::make_conditional(Expression* cond, Expression* then, | |
15357 | Expression* else_expr, Location location) | |
15358 | { | |
15359 | return new Conditional_expression(cond, then, else_expr, location); | |
15360 | } | |
15361 | ||
da244e59 | 15362 | // Class Compound_expression. |
2c809f8f | 15363 | |
15364 | // Traversal. | |
15365 | ||
15366 | int | |
15367 | Compound_expression::do_traverse(Traverse* traverse) | |
15368 | { | |
15369 | if (Expression::traverse(&this->init_, traverse) == TRAVERSE_EXIT | |
15370 | || Expression::traverse(&this->expr_, traverse) == TRAVERSE_EXIT) | |
15371 | return TRAVERSE_EXIT; | |
15372 | return TRAVERSE_CONTINUE; | |
15373 | } | |
15374 | ||
15375 | // Return the type of the compound expression. | |
15376 | ||
15377 | Type* | |
15378 | Compound_expression::do_type() | |
15379 | { | |
15380 | return this->expr_->type(); | |
15381 | } | |
15382 | ||
15383 | // Determine type for a compound expression. | |
15384 | ||
15385 | void | |
15386 | Compound_expression::do_determine_type(const Type_context* context) | |
15387 | { | |
15388 | this->init_->determine_type_no_context(); | |
15389 | this->expr_->determine_type(context); | |
15390 | } | |
15391 | ||
15392 | // Get the backend representation of a compound expression. | |
15393 | ||
ea664253 | 15394 | Bexpression* |
15395 | Compound_expression::do_get_backend(Translate_context* context) | |
2c809f8f | 15396 | { |
15397 | Gogo* gogo = context->gogo(); | |
ea664253 | 15398 | Bexpression* binit = this->init_->get_backend(context); |
2c809f8f | 15399 | Bstatement* init_stmt = gogo->backend()->expression_statement(binit); |
ea664253 | 15400 | Bexpression* bexpr = this->expr_->get_backend(context); |
15401 | return gogo->backend()->compound_expression(init_stmt, bexpr, | |
15402 | this->location()); | |
2c809f8f | 15403 | } |
15404 | ||
15405 | // Dump ast representation of a conditional expression. | |
15406 | ||
15407 | void | |
15408 | Compound_expression::do_dump_expression( | |
15409 | Ast_dump_context* ast_dump_context) const | |
15410 | { | |
15411 | ast_dump_context->ostream() << "("; | |
15412 | ast_dump_context->dump_expression(this->init_); | |
15413 | ast_dump_context->ostream() << ","; | |
15414 | ast_dump_context->dump_expression(this->expr_); | |
15415 | ast_dump_context->ostream() << ") "; | |
15416 | } | |
15417 | ||
15418 | // Make a compound expression. | |
15419 | ||
15420 | Expression* | |
15421 | Expression::make_compound(Expression* init, Expression* expr, Location location) | |
15422 | { | |
15423 | return new Compound_expression(init, expr, location); | |
15424 | } | |
15425 | ||
e440a328 | 15426 | // Import an expression. This comes at the end in order to see the |
15427 | // various class definitions. | |
15428 | ||
15429 | Expression* | |
15430 | Expression::import_expression(Import* imp) | |
15431 | { | |
15432 | int c = imp->peek_char(); | |
15433 | if (imp->match_c_string("- ") | |
15434 | || imp->match_c_string("! ") | |
15435 | || imp->match_c_string("^ ")) | |
15436 | return Unary_expression::do_import(imp); | |
15437 | else if (c == '(') | |
15438 | return Binary_expression::do_import(imp); | |
15439 | else if (imp->match_c_string("true") | |
15440 | || imp->match_c_string("false")) | |
15441 | return Boolean_expression::do_import(imp); | |
15442 | else if (c == '"') | |
15443 | return String_expression::do_import(imp); | |
15444 | else if (c == '-' || (c >= '0' && c <= '9')) | |
15445 | { | |
15446 | // This handles integers, floats and complex constants. | |
15447 | return Integer_expression::do_import(imp); | |
15448 | } | |
15449 | else if (imp->match_c_string("nil")) | |
15450 | return Nil_expression::do_import(imp); | |
15451 | else if (imp->match_c_string("convert")) | |
15452 | return Type_conversion_expression::do_import(imp); | |
15453 | else | |
15454 | { | |
631d5788 | 15455 | go_error_at(imp->location(), "import error: expected expression"); |
e440a328 | 15456 | return Expression::make_error(imp->location()); |
15457 | } | |
15458 | } | |
15459 | ||
15460 | // Class Expression_list. | |
15461 | ||
15462 | // Traverse the list. | |
15463 | ||
15464 | int | |
15465 | Expression_list::traverse(Traverse* traverse) | |
15466 | { | |
15467 | for (Expression_list::iterator p = this->begin(); | |
15468 | p != this->end(); | |
15469 | ++p) | |
15470 | { | |
15471 | if (*p != NULL) | |
15472 | { | |
15473 | if (Expression::traverse(&*p, traverse) == TRAVERSE_EXIT) | |
15474 | return TRAVERSE_EXIT; | |
15475 | } | |
15476 | } | |
15477 | return TRAVERSE_CONTINUE; | |
15478 | } | |
15479 | ||
15480 | // Copy the list. | |
15481 | ||
15482 | Expression_list* | |
15483 | Expression_list::copy() | |
15484 | { | |
15485 | Expression_list* ret = new Expression_list(); | |
15486 | for (Expression_list::iterator p = this->begin(); | |
15487 | p != this->end(); | |
15488 | ++p) | |
15489 | { | |
15490 | if (*p == NULL) | |
15491 | ret->push_back(NULL); | |
15492 | else | |
15493 | ret->push_back((*p)->copy()); | |
15494 | } | |
15495 | return ret; | |
15496 | } | |
15497 | ||
15498 | // Return whether an expression list has an error expression. | |
15499 | ||
15500 | bool | |
15501 | Expression_list::contains_error() const | |
15502 | { | |
15503 | for (Expression_list::const_iterator p = this->begin(); | |
15504 | p != this->end(); | |
15505 | ++p) | |
15506 | if (*p != NULL && (*p)->is_error_expression()) | |
15507 | return true; | |
15508 | return false; | |
15509 | } | |
0c77715b | 15510 | |
15511 | // Class Numeric_constant. | |
15512 | ||
15513 | // Destructor. | |
15514 | ||
15515 | Numeric_constant::~Numeric_constant() | |
15516 | { | |
15517 | this->clear(); | |
15518 | } | |
15519 | ||
15520 | // Copy constructor. | |
15521 | ||
15522 | Numeric_constant::Numeric_constant(const Numeric_constant& a) | |
15523 | : classification_(a.classification_), type_(a.type_) | |
15524 | { | |
15525 | switch (a.classification_) | |
15526 | { | |
15527 | case NC_INVALID: | |
15528 | break; | |
15529 | case NC_INT: | |
15530 | case NC_RUNE: | |
15531 | mpz_init_set(this->u_.int_val, a.u_.int_val); | |
15532 | break; | |
15533 | case NC_FLOAT: | |
15534 | mpfr_init_set(this->u_.float_val, a.u_.float_val, GMP_RNDN); | |
15535 | break; | |
15536 | case NC_COMPLEX: | |
fcbea5e4 | 15537 | mpc_init2(this->u_.complex_val, mpc_precision); |
15538 | mpc_set(this->u_.complex_val, a.u_.complex_val, MPC_RNDNN); | |
0c77715b | 15539 | break; |
15540 | default: | |
15541 | go_unreachable(); | |
15542 | } | |
15543 | } | |
15544 | ||
15545 | // Assignment operator. | |
15546 | ||
15547 | Numeric_constant& | |
15548 | Numeric_constant::operator=(const Numeric_constant& a) | |
15549 | { | |
15550 | this->clear(); | |
15551 | this->classification_ = a.classification_; | |
15552 | this->type_ = a.type_; | |
15553 | switch (a.classification_) | |
15554 | { | |
15555 | case NC_INVALID: | |
15556 | break; | |
15557 | case NC_INT: | |
15558 | case NC_RUNE: | |
15559 | mpz_init_set(this->u_.int_val, a.u_.int_val); | |
15560 | break; | |
15561 | case NC_FLOAT: | |
15562 | mpfr_init_set(this->u_.float_val, a.u_.float_val, GMP_RNDN); | |
15563 | break; | |
15564 | case NC_COMPLEX: | |
fcbea5e4 | 15565 | mpc_init2(this->u_.complex_val, mpc_precision); |
15566 | mpc_set(this->u_.complex_val, a.u_.complex_val, MPC_RNDNN); | |
0c77715b | 15567 | break; |
15568 | default: | |
15569 | go_unreachable(); | |
15570 | } | |
15571 | return *this; | |
15572 | } | |
15573 | ||
15574 | // Clear the contents. | |
15575 | ||
15576 | void | |
15577 | Numeric_constant::clear() | |
15578 | { | |
15579 | switch (this->classification_) | |
15580 | { | |
15581 | case NC_INVALID: | |
15582 | break; | |
15583 | case NC_INT: | |
15584 | case NC_RUNE: | |
15585 | mpz_clear(this->u_.int_val); | |
15586 | break; | |
15587 | case NC_FLOAT: | |
15588 | mpfr_clear(this->u_.float_val); | |
15589 | break; | |
15590 | case NC_COMPLEX: | |
fcbea5e4 | 15591 | mpc_clear(this->u_.complex_val); |
0c77715b | 15592 | break; |
15593 | default: | |
15594 | go_unreachable(); | |
15595 | } | |
15596 | this->classification_ = NC_INVALID; | |
15597 | } | |
15598 | ||
15599 | // Set to an unsigned long value. | |
15600 | ||
15601 | void | |
15602 | Numeric_constant::set_unsigned_long(Type* type, unsigned long val) | |
15603 | { | |
15604 | this->clear(); | |
15605 | this->classification_ = NC_INT; | |
15606 | this->type_ = type; | |
15607 | mpz_init_set_ui(this->u_.int_val, val); | |
15608 | } | |
15609 | ||
15610 | // Set to an integer value. | |
15611 | ||
15612 | void | |
15613 | Numeric_constant::set_int(Type* type, const mpz_t val) | |
15614 | { | |
15615 | this->clear(); | |
15616 | this->classification_ = NC_INT; | |
15617 | this->type_ = type; | |
15618 | mpz_init_set(this->u_.int_val, val); | |
15619 | } | |
15620 | ||
15621 | // Set to a rune value. | |
15622 | ||
15623 | void | |
15624 | Numeric_constant::set_rune(Type* type, const mpz_t val) | |
15625 | { | |
15626 | this->clear(); | |
15627 | this->classification_ = NC_RUNE; | |
15628 | this->type_ = type; | |
15629 | mpz_init_set(this->u_.int_val, val); | |
15630 | } | |
15631 | ||
15632 | // Set to a floating point value. | |
15633 | ||
15634 | void | |
15635 | Numeric_constant::set_float(Type* type, const mpfr_t val) | |
15636 | { | |
15637 | this->clear(); | |
15638 | this->classification_ = NC_FLOAT; | |
15639 | this->type_ = type; | |
833b523c | 15640 | // Numeric constants do not have negative zero values, so remove |
15641 | // them here. They also don't have infinity or NaN values, but we | |
15642 | // should never see them here. | |
15643 | if (mpfr_zero_p(val)) | |
15644 | mpfr_init_set_ui(this->u_.float_val, 0, GMP_RNDN); | |
15645 | else | |
15646 | mpfr_init_set(this->u_.float_val, val, GMP_RNDN); | |
0c77715b | 15647 | } |
15648 | ||
15649 | // Set to a complex value. | |
15650 | ||
15651 | void | |
fcbea5e4 | 15652 | Numeric_constant::set_complex(Type* type, const mpc_t val) |
0c77715b | 15653 | { |
15654 | this->clear(); | |
15655 | this->classification_ = NC_COMPLEX; | |
15656 | this->type_ = type; | |
fcbea5e4 | 15657 | mpc_init2(this->u_.complex_val, mpc_precision); |
15658 | mpc_set(this->u_.complex_val, val, MPC_RNDNN); | |
0c77715b | 15659 | } |
15660 | ||
15661 | // Get an int value. | |
15662 | ||
15663 | void | |
15664 | Numeric_constant::get_int(mpz_t* val) const | |
15665 | { | |
15666 | go_assert(this->is_int()); | |
15667 | mpz_init_set(*val, this->u_.int_val); | |
15668 | } | |
15669 | ||
15670 | // Get a rune value. | |
15671 | ||
15672 | void | |
15673 | Numeric_constant::get_rune(mpz_t* val) const | |
15674 | { | |
15675 | go_assert(this->is_rune()); | |
15676 | mpz_init_set(*val, this->u_.int_val); | |
15677 | } | |
15678 | ||
15679 | // Get a floating point value. | |
15680 | ||
15681 | void | |
15682 | Numeric_constant::get_float(mpfr_t* val) const | |
15683 | { | |
15684 | go_assert(this->is_float()); | |
15685 | mpfr_init_set(*val, this->u_.float_val, GMP_RNDN); | |
15686 | } | |
15687 | ||
15688 | // Get a complex value. | |
15689 | ||
15690 | void | |
fcbea5e4 | 15691 | Numeric_constant::get_complex(mpc_t* val) const |
0c77715b | 15692 | { |
15693 | go_assert(this->is_complex()); | |
fcbea5e4 | 15694 | mpc_init2(*val, mpc_precision); |
15695 | mpc_set(*val, this->u_.complex_val, MPC_RNDNN); | |
0c77715b | 15696 | } |
15697 | ||
15698 | // Express value as unsigned long if possible. | |
15699 | ||
15700 | Numeric_constant::To_unsigned_long | |
15701 | Numeric_constant::to_unsigned_long(unsigned long* val) const | |
15702 | { | |
15703 | switch (this->classification_) | |
15704 | { | |
15705 | case NC_INT: | |
15706 | case NC_RUNE: | |
15707 | return this->mpz_to_unsigned_long(this->u_.int_val, val); | |
15708 | case NC_FLOAT: | |
15709 | return this->mpfr_to_unsigned_long(this->u_.float_val, val); | |
15710 | case NC_COMPLEX: | |
fcbea5e4 | 15711 | if (!mpfr_zero_p(mpc_imagref(this->u_.complex_val))) |
0c77715b | 15712 | return NC_UL_NOTINT; |
fcbea5e4 | 15713 | return this->mpfr_to_unsigned_long(mpc_realref(this->u_.complex_val), |
15714 | val); | |
0c77715b | 15715 | default: |
15716 | go_unreachable(); | |
15717 | } | |
15718 | } | |
15719 | ||
15720 | // Express integer value as unsigned long if possible. | |
15721 | ||
15722 | Numeric_constant::To_unsigned_long | |
15723 | Numeric_constant::mpz_to_unsigned_long(const mpz_t ival, | |
15724 | unsigned long *val) const | |
15725 | { | |
15726 | if (mpz_sgn(ival) < 0) | |
15727 | return NC_UL_NEGATIVE; | |
15728 | unsigned long ui = mpz_get_ui(ival); | |
15729 | if (mpz_cmp_ui(ival, ui) != 0) | |
15730 | return NC_UL_BIG; | |
15731 | *val = ui; | |
15732 | return NC_UL_VALID; | |
15733 | } | |
15734 | ||
15735 | // Express floating point value as unsigned long if possible. | |
15736 | ||
15737 | Numeric_constant::To_unsigned_long | |
15738 | Numeric_constant::mpfr_to_unsigned_long(const mpfr_t fval, | |
15739 | unsigned long *val) const | |
15740 | { | |
15741 | if (!mpfr_integer_p(fval)) | |
15742 | return NC_UL_NOTINT; | |
15743 | mpz_t ival; | |
15744 | mpz_init(ival); | |
15745 | mpfr_get_z(ival, fval, GMP_RNDN); | |
15746 | To_unsigned_long ret = this->mpz_to_unsigned_long(ival, val); | |
15747 | mpz_clear(ival); | |
15748 | return ret; | |
15749 | } | |
15750 | ||
15751 | // Convert value to integer if possible. | |
15752 | ||
15753 | bool | |
15754 | Numeric_constant::to_int(mpz_t* val) const | |
15755 | { | |
15756 | switch (this->classification_) | |
15757 | { | |
15758 | case NC_INT: | |
15759 | case NC_RUNE: | |
15760 | mpz_init_set(*val, this->u_.int_val); | |
15761 | return true; | |
15762 | case NC_FLOAT: | |
15763 | if (!mpfr_integer_p(this->u_.float_val)) | |
15764 | return false; | |
15765 | mpz_init(*val); | |
15766 | mpfr_get_z(*val, this->u_.float_val, GMP_RNDN); | |
15767 | return true; | |
15768 | case NC_COMPLEX: | |
fcbea5e4 | 15769 | if (!mpfr_zero_p(mpc_imagref(this->u_.complex_val)) |
15770 | || !mpfr_integer_p(mpc_realref(this->u_.complex_val))) | |
0c77715b | 15771 | return false; |
15772 | mpz_init(*val); | |
fcbea5e4 | 15773 | mpfr_get_z(*val, mpc_realref(this->u_.complex_val), GMP_RNDN); |
0c77715b | 15774 | return true; |
15775 | default: | |
15776 | go_unreachable(); | |
15777 | } | |
15778 | } | |
15779 | ||
15780 | // Convert value to floating point if possible. | |
15781 | ||
15782 | bool | |
15783 | Numeric_constant::to_float(mpfr_t* val) const | |
15784 | { | |
15785 | switch (this->classification_) | |
15786 | { | |
15787 | case NC_INT: | |
15788 | case NC_RUNE: | |
15789 | mpfr_init_set_z(*val, this->u_.int_val, GMP_RNDN); | |
15790 | return true; | |
15791 | case NC_FLOAT: | |
15792 | mpfr_init_set(*val, this->u_.float_val, GMP_RNDN); | |
15793 | return true; | |
15794 | case NC_COMPLEX: | |
fcbea5e4 | 15795 | if (!mpfr_zero_p(mpc_imagref(this->u_.complex_val))) |
0c77715b | 15796 | return false; |
fcbea5e4 | 15797 | mpfr_init_set(*val, mpc_realref(this->u_.complex_val), GMP_RNDN); |
0c77715b | 15798 | return true; |
15799 | default: | |
15800 | go_unreachable(); | |
15801 | } | |
15802 | } | |
15803 | ||
15804 | // Convert value to complex. | |
15805 | ||
15806 | bool | |
fcbea5e4 | 15807 | Numeric_constant::to_complex(mpc_t* val) const |
0c77715b | 15808 | { |
fcbea5e4 | 15809 | mpc_init2(*val, mpc_precision); |
0c77715b | 15810 | switch (this->classification_) |
15811 | { | |
15812 | case NC_INT: | |
15813 | case NC_RUNE: | |
fcbea5e4 | 15814 | mpc_set_z(*val, this->u_.int_val, MPC_RNDNN); |
0c77715b | 15815 | return true; |
15816 | case NC_FLOAT: | |
fcbea5e4 | 15817 | mpc_set_fr(*val, this->u_.float_val, MPC_RNDNN); |
0c77715b | 15818 | return true; |
15819 | case NC_COMPLEX: | |
fcbea5e4 | 15820 | mpc_set(*val, this->u_.complex_val, MPC_RNDNN); |
0c77715b | 15821 | return true; |
15822 | default: | |
15823 | go_unreachable(); | |
15824 | } | |
15825 | } | |
15826 | ||
15827 | // Get the type. | |
15828 | ||
15829 | Type* | |
15830 | Numeric_constant::type() const | |
15831 | { | |
15832 | if (this->type_ != NULL) | |
15833 | return this->type_; | |
15834 | switch (this->classification_) | |
15835 | { | |
15836 | case NC_INT: | |
15837 | return Type::make_abstract_integer_type(); | |
15838 | case NC_RUNE: | |
15839 | return Type::make_abstract_character_type(); | |
15840 | case NC_FLOAT: | |
15841 | return Type::make_abstract_float_type(); | |
15842 | case NC_COMPLEX: | |
15843 | return Type::make_abstract_complex_type(); | |
15844 | default: | |
15845 | go_unreachable(); | |
15846 | } | |
15847 | } | |
15848 | ||
15849 | // If the constant can be expressed in TYPE, then set the type of the | |
15850 | // constant to TYPE and return true. Otherwise return false, and, if | |
15851 | // ISSUE_ERROR is true, report an appropriate error message. | |
15852 | ||
15853 | bool | |
15854 | Numeric_constant::set_type(Type* type, bool issue_error, Location loc) | |
15855 | { | |
15856 | bool ret; | |
f11c2155 | 15857 | if (type == NULL || type->is_error()) |
0c77715b | 15858 | ret = true; |
15859 | else if (type->integer_type() != NULL) | |
15860 | ret = this->check_int_type(type->integer_type(), issue_error, loc); | |
15861 | else if (type->float_type() != NULL) | |
15862 | ret = this->check_float_type(type->float_type(), issue_error, loc); | |
15863 | else if (type->complex_type() != NULL) | |
15864 | ret = this->check_complex_type(type->complex_type(), issue_error, loc); | |
15865 | else | |
5706ab68 | 15866 | { |
15867 | ret = false; | |
15868 | if (issue_error) | |
15869 | go_assert(saw_errors()); | |
15870 | } | |
0c77715b | 15871 | if (ret) |
15872 | this->type_ = type; | |
15873 | return ret; | |
15874 | } | |
15875 | ||
15876 | // Check whether the constant can be expressed in an integer type. | |
15877 | ||
15878 | bool | |
15879 | Numeric_constant::check_int_type(Integer_type* type, bool issue_error, | |
71a45216 | 15880 | Location location) |
0c77715b | 15881 | { |
15882 | mpz_t val; | |
15883 | switch (this->classification_) | |
15884 | { | |
15885 | case NC_INT: | |
15886 | case NC_RUNE: | |
15887 | mpz_init_set(val, this->u_.int_val); | |
15888 | break; | |
15889 | ||
15890 | case NC_FLOAT: | |
15891 | if (!mpfr_integer_p(this->u_.float_val)) | |
15892 | { | |
15893 | if (issue_error) | |
71a45216 | 15894 | { |
631d5788 | 15895 | go_error_at(location, |
15896 | "floating point constant truncated to integer"); | |
71a45216 | 15897 | this->set_invalid(); |
15898 | } | |
0c77715b | 15899 | return false; |
15900 | } | |
15901 | mpz_init(val); | |
15902 | mpfr_get_z(val, this->u_.float_val, GMP_RNDN); | |
15903 | break; | |
15904 | ||
15905 | case NC_COMPLEX: | |
fcbea5e4 | 15906 | if (!mpfr_integer_p(mpc_realref(this->u_.complex_val)) |
15907 | || !mpfr_zero_p(mpc_imagref(this->u_.complex_val))) | |
0c77715b | 15908 | { |
15909 | if (issue_error) | |
71a45216 | 15910 | { |
631d5788 | 15911 | go_error_at(location, "complex constant truncated to integer"); |
71a45216 | 15912 | this->set_invalid(); |
15913 | } | |
0c77715b | 15914 | return false; |
15915 | } | |
15916 | mpz_init(val); | |
fcbea5e4 | 15917 | mpfr_get_z(val, mpc_realref(this->u_.complex_val), GMP_RNDN); |
0c77715b | 15918 | break; |
15919 | ||
15920 | default: | |
15921 | go_unreachable(); | |
15922 | } | |
15923 | ||
15924 | bool ret; | |
15925 | if (type->is_abstract()) | |
15926 | ret = true; | |
15927 | else | |
15928 | { | |
15929 | int bits = mpz_sizeinbase(val, 2); | |
15930 | if (type->is_unsigned()) | |
15931 | { | |
15932 | // For an unsigned type we can only accept a nonnegative | |
15933 | // number, and we must be able to represents at least BITS. | |
15934 | ret = mpz_sgn(val) >= 0 && bits <= type->bits(); | |
15935 | } | |
15936 | else | |
15937 | { | |
15938 | // For a signed type we need an extra bit to indicate the | |
15939 | // sign. We have to handle the most negative integer | |
15940 | // specially. | |
15941 | ret = (bits + 1 <= type->bits() | |
15942 | || (bits <= type->bits() | |
15943 | && mpz_sgn(val) < 0 | |
15944 | && (mpz_scan1(val, 0) | |
15945 | == static_cast<unsigned long>(type->bits() - 1)) | |
15946 | && mpz_scan0(val, type->bits()) == ULONG_MAX)); | |
15947 | } | |
15948 | } | |
15949 | ||
15950 | if (!ret && issue_error) | |
71a45216 | 15951 | { |
631d5788 | 15952 | go_error_at(location, "integer constant overflow"); |
71a45216 | 15953 | this->set_invalid(); |
15954 | } | |
0c77715b | 15955 | |
15956 | return ret; | |
15957 | } | |
15958 | ||
15959 | // Check whether the constant can be expressed in a floating point | |
15960 | // type. | |
15961 | ||
15962 | bool | |
15963 | Numeric_constant::check_float_type(Float_type* type, bool issue_error, | |
d0bcce51 | 15964 | Location location) |
0c77715b | 15965 | { |
15966 | mpfr_t val; | |
15967 | switch (this->classification_) | |
15968 | { | |
15969 | case NC_INT: | |
15970 | case NC_RUNE: | |
15971 | mpfr_init_set_z(val, this->u_.int_val, GMP_RNDN); | |
15972 | break; | |
15973 | ||
15974 | case NC_FLOAT: | |
15975 | mpfr_init_set(val, this->u_.float_val, GMP_RNDN); | |
15976 | break; | |
15977 | ||
15978 | case NC_COMPLEX: | |
fcbea5e4 | 15979 | if (!mpfr_zero_p(mpc_imagref(this->u_.complex_val))) |
0c77715b | 15980 | { |
15981 | if (issue_error) | |
71a45216 | 15982 | { |
15983 | this->set_invalid(); | |
631d5788 | 15984 | go_error_at(location, "complex constant truncated to float"); |
71a45216 | 15985 | } |
0c77715b | 15986 | return false; |
15987 | } | |
fcbea5e4 | 15988 | mpfr_init_set(val, mpc_realref(this->u_.complex_val), GMP_RNDN); |
0c77715b | 15989 | break; |
15990 | ||
15991 | default: | |
15992 | go_unreachable(); | |
15993 | } | |
15994 | ||
15995 | bool ret; | |
15996 | if (type->is_abstract()) | |
15997 | ret = true; | |
15998 | else if (mpfr_nan_p(val) || mpfr_inf_p(val) || mpfr_zero_p(val)) | |
15999 | { | |
16000 | // A NaN or Infinity always fits in the range of the type. | |
16001 | ret = true; | |
16002 | } | |
16003 | else | |
16004 | { | |
16005 | mp_exp_t exp = mpfr_get_exp(val); | |
16006 | mp_exp_t max_exp; | |
16007 | switch (type->bits()) | |
16008 | { | |
16009 | case 32: | |
16010 | max_exp = 128; | |
16011 | break; | |
16012 | case 64: | |
16013 | max_exp = 1024; | |
16014 | break; | |
16015 | default: | |
16016 | go_unreachable(); | |
16017 | } | |
16018 | ||
16019 | ret = exp <= max_exp; | |
d0bcce51 | 16020 | |
16021 | if (ret) | |
16022 | { | |
16023 | // Round the constant to the desired type. | |
16024 | mpfr_t t; | |
16025 | mpfr_init(t); | |
16026 | switch (type->bits()) | |
16027 | { | |
16028 | case 32: | |
16029 | mpfr_set_prec(t, 24); | |
16030 | break; | |
16031 | case 64: | |
16032 | mpfr_set_prec(t, 53); | |
16033 | break; | |
16034 | default: | |
16035 | go_unreachable(); | |
16036 | } | |
16037 | mpfr_set(t, val, GMP_RNDN); | |
16038 | mpfr_set(val, t, GMP_RNDN); | |
16039 | mpfr_clear(t); | |
16040 | ||
16041 | this->set_float(type, val); | |
16042 | } | |
0c77715b | 16043 | } |
16044 | ||
16045 | mpfr_clear(val); | |
16046 | ||
16047 | if (!ret && issue_error) | |
71a45216 | 16048 | { |
631d5788 | 16049 | go_error_at(location, "floating point constant overflow"); |
71a45216 | 16050 | this->set_invalid(); |
16051 | } | |
0c77715b | 16052 | |
16053 | return ret; | |
16054 | } | |
16055 | ||
16056 | // Check whether the constant can be expressed in a complex type. | |
16057 | ||
16058 | bool | |
16059 | Numeric_constant::check_complex_type(Complex_type* type, bool issue_error, | |
d0bcce51 | 16060 | Location location) |
0c77715b | 16061 | { |
16062 | if (type->is_abstract()) | |
16063 | return true; | |
16064 | ||
16065 | mp_exp_t max_exp; | |
16066 | switch (type->bits()) | |
16067 | { | |
16068 | case 64: | |
16069 | max_exp = 128; | |
16070 | break; | |
16071 | case 128: | |
16072 | max_exp = 1024; | |
16073 | break; | |
16074 | default: | |
16075 | go_unreachable(); | |
16076 | } | |
16077 | ||
fcbea5e4 | 16078 | mpc_t val; |
16079 | mpc_init2(val, mpc_precision); | |
0c77715b | 16080 | switch (this->classification_) |
16081 | { | |
16082 | case NC_INT: | |
16083 | case NC_RUNE: | |
fcbea5e4 | 16084 | mpc_set_z(val, this->u_.int_val, MPC_RNDNN); |
0c77715b | 16085 | break; |
16086 | ||
16087 | case NC_FLOAT: | |
fcbea5e4 | 16088 | mpc_set_fr(val, this->u_.float_val, MPC_RNDNN); |
0c77715b | 16089 | break; |
16090 | ||
16091 | case NC_COMPLEX: | |
fcbea5e4 | 16092 | mpc_set(val, this->u_.complex_val, MPC_RNDNN); |
0c77715b | 16093 | break; |
16094 | ||
16095 | default: | |
16096 | go_unreachable(); | |
16097 | } | |
16098 | ||
d0bcce51 | 16099 | bool ret = true; |
fcbea5e4 | 16100 | if (!mpfr_nan_p(mpc_realref(val)) |
16101 | && !mpfr_inf_p(mpc_realref(val)) | |
16102 | && !mpfr_zero_p(mpc_realref(val)) | |
16103 | && mpfr_get_exp(mpc_realref(val)) > max_exp) | |
d0bcce51 | 16104 | { |
16105 | if (issue_error) | |
71a45216 | 16106 | { |
631d5788 | 16107 | go_error_at(location, "complex real part overflow"); |
71a45216 | 16108 | this->set_invalid(); |
16109 | } | |
d0bcce51 | 16110 | ret = false; |
16111 | } | |
0c77715b | 16112 | |
fcbea5e4 | 16113 | if (!mpfr_nan_p(mpc_imagref(val)) |
16114 | && !mpfr_inf_p(mpc_imagref(val)) | |
16115 | && !mpfr_zero_p(mpc_imagref(val)) | |
16116 | && mpfr_get_exp(mpc_imagref(val)) > max_exp) | |
d0bcce51 | 16117 | { |
16118 | if (issue_error) | |
71a45216 | 16119 | { |
631d5788 | 16120 | go_error_at(location, "complex imaginary part overflow"); |
71a45216 | 16121 | this->set_invalid(); |
16122 | } | |
d0bcce51 | 16123 | ret = false; |
16124 | } | |
0c77715b | 16125 | |
d0bcce51 | 16126 | if (ret) |
16127 | { | |
16128 | // Round the constant to the desired type. | |
fcbea5e4 | 16129 | mpc_t t; |
d0bcce51 | 16130 | switch (type->bits()) |
16131 | { | |
16132 | case 64: | |
fcbea5e4 | 16133 | mpc_init2(t, 24); |
d0bcce51 | 16134 | break; |
16135 | case 128: | |
fcbea5e4 | 16136 | mpc_init2(t, 53); |
d0bcce51 | 16137 | break; |
16138 | default: | |
16139 | go_unreachable(); | |
16140 | } | |
fcbea5e4 | 16141 | mpc_set(t, val, MPC_RNDNN); |
16142 | mpc_set(val, t, MPC_RNDNN); | |
16143 | mpc_clear(t); | |
d0bcce51 | 16144 | |
fcbea5e4 | 16145 | this->set_complex(type, val); |
d0bcce51 | 16146 | } |
16147 | ||
fcbea5e4 | 16148 | mpc_clear(val); |
0c77715b | 16149 | |
16150 | return ret; | |
16151 | } | |
16152 | ||
16153 | // Return an Expression for this value. | |
16154 | ||
16155 | Expression* | |
16156 | Numeric_constant::expression(Location loc) const | |
16157 | { | |
16158 | switch (this->classification_) | |
16159 | { | |
16160 | case NC_INT: | |
e67508fa | 16161 | return Expression::make_integer_z(&this->u_.int_val, this->type_, loc); |
0c77715b | 16162 | case NC_RUNE: |
16163 | return Expression::make_character(&this->u_.int_val, this->type_, loc); | |
16164 | case NC_FLOAT: | |
16165 | return Expression::make_float(&this->u_.float_val, this->type_, loc); | |
16166 | case NC_COMPLEX: | |
fcbea5e4 | 16167 | return Expression::make_complex(&this->u_.complex_val, this->type_, loc); |
71a45216 | 16168 | case NC_INVALID: |
16169 | go_assert(saw_errors()); | |
16170 | return Expression::make_error(loc); | |
0c77715b | 16171 | default: |
16172 | go_unreachable(); | |
16173 | } | |
16174 | } |