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e440a328 | 1 | // expressions.cc -- Go frontend expression handling. |
2 | ||
3 | // Copyright 2009 The Go Authors. All rights reserved. | |
4 | // Use of this source code is governed by a BSD-style | |
5 | // license that can be found in the LICENSE file. | |
6 | ||
7 | #include "go-system.h" | |
8 | ||
ffe743ca | 9 | #include <algorithm> |
10 | ||
e440a328 | 11 | #include "go-c.h" |
12 | #include "gogo.h" | |
13 | #include "types.h" | |
14 | #include "export.h" | |
15 | #include "import.h" | |
16 | #include "statements.h" | |
17 | #include "lex.h" | |
a9182619 | 18 | #include "runtime.h" |
6e193e6f | 19 | #include "backend.h" |
e440a328 | 20 | #include "expressions.h" |
d751bb78 | 21 | #include "ast-dump.h" |
e440a328 | 22 | |
23 | // Class Expression. | |
24 | ||
25 | Expression::Expression(Expression_classification classification, | |
b13c66cd | 26 | Location location) |
e440a328 | 27 | : classification_(classification), location_(location) |
28 | { | |
29 | } | |
30 | ||
31 | Expression::~Expression() | |
32 | { | |
33 | } | |
34 | ||
e440a328 | 35 | // Traverse the expressions. |
36 | ||
37 | int | |
38 | Expression::traverse(Expression** pexpr, Traverse* traverse) | |
39 | { | |
40 | Expression* expr = *pexpr; | |
41 | if ((traverse->traverse_mask() & Traverse::traverse_expressions) != 0) | |
42 | { | |
43 | int t = traverse->expression(pexpr); | |
44 | if (t == TRAVERSE_EXIT) | |
45 | return TRAVERSE_EXIT; | |
46 | else if (t == TRAVERSE_SKIP_COMPONENTS) | |
47 | return TRAVERSE_CONTINUE; | |
48 | } | |
49 | return expr->do_traverse(traverse); | |
50 | } | |
51 | ||
52 | // Traverse subexpressions of this expression. | |
53 | ||
54 | int | |
55 | Expression::traverse_subexpressions(Traverse* traverse) | |
56 | { | |
57 | return this->do_traverse(traverse); | |
58 | } | |
59 | ||
60 | // Default implementation for do_traverse for child classes. | |
61 | ||
62 | int | |
63 | Expression::do_traverse(Traverse*) | |
64 | { | |
65 | return TRAVERSE_CONTINUE; | |
66 | } | |
67 | ||
68 | // This virtual function is called by the parser if the value of this | |
a7549a6a | 69 | // expression is being discarded. By default, we give an error. |
70 | // Expressions with side effects override. | |
e440a328 | 71 | |
4f2138d7 | 72 | bool |
e440a328 | 73 | Expression::do_discarding_value() |
74 | { | |
a7549a6a | 75 | this->unused_value_error(); |
4f2138d7 | 76 | return false; |
e440a328 | 77 | } |
78 | ||
79 | // This virtual function is called to export expressions. This will | |
80 | // only be used by expressions which may be constant. | |
81 | ||
82 | void | |
83 | Expression::do_export(Export*) const | |
84 | { | |
c3e6f413 | 85 | go_unreachable(); |
e440a328 | 86 | } |
87 | ||
a7549a6a | 88 | // Give an error saying that the value of the expression is not used. |
e440a328 | 89 | |
90 | void | |
a7549a6a | 91 | Expression::unused_value_error() |
e440a328 | 92 | { |
4f2138d7 | 93 | this->report_error(_("value computed is not used")); |
e440a328 | 94 | } |
95 | ||
96 | // Note that this expression is an error. This is called by children | |
97 | // when they discover an error. | |
98 | ||
99 | void | |
100 | Expression::set_is_error() | |
101 | { | |
102 | this->classification_ = EXPRESSION_ERROR; | |
103 | } | |
104 | ||
105 | // For children to call to report an error conveniently. | |
106 | ||
107 | void | |
108 | Expression::report_error(const char* msg) | |
109 | { | |
110 | error_at(this->location_, "%s", msg); | |
111 | this->set_is_error(); | |
112 | } | |
113 | ||
114 | // Set types of variables and constants. This is implemented by the | |
115 | // child class. | |
116 | ||
117 | void | |
118 | Expression::determine_type(const Type_context* context) | |
119 | { | |
120 | this->do_determine_type(context); | |
121 | } | |
122 | ||
123 | // Set types when there is no context. | |
124 | ||
125 | void | |
126 | Expression::determine_type_no_context() | |
127 | { | |
128 | Type_context context; | |
129 | this->do_determine_type(&context); | |
130 | } | |
131 | ||
2c809f8f | 132 | // Return an expression handling any conversions which must be done during |
e440a328 | 133 | // assignment. |
134 | ||
2c809f8f | 135 | Expression* |
136 | Expression::convert_for_assignment(Gogo* gogo, Type* lhs_type, | |
137 | Expression* rhs, Location location) | |
e440a328 | 138 | { |
2c809f8f | 139 | Type* rhs_type = rhs->type(); |
140 | if (lhs_type->is_error() | |
141 | || rhs_type->is_error() | |
142 | || rhs->is_error_expression()) | |
143 | return Expression::make_error(location); | |
e440a328 | 144 | |
54211955 | 145 | if (lhs_type->forwarded() != rhs_type->forwarded() |
146 | && lhs_type->interface_type() != NULL) | |
e440a328 | 147 | { |
148 | if (rhs_type->interface_type() == NULL) | |
2c809f8f | 149 | return Expression::convert_type_to_interface(lhs_type, rhs, location); |
e440a328 | 150 | else |
2c809f8f | 151 | return Expression::convert_interface_to_interface(lhs_type, rhs, false, |
152 | location); | |
e440a328 | 153 | } |
54211955 | 154 | else if (lhs_type->forwarded() != rhs_type->forwarded() |
155 | && rhs_type->interface_type() != NULL) | |
2c809f8f | 156 | return Expression::convert_interface_to_type(lhs_type, rhs, location); |
411eb89e | 157 | else if (lhs_type->is_slice_type() && rhs_type->is_nil_type()) |
e440a328 | 158 | { |
2c809f8f | 159 | // Assigning nil to a slice. |
2c809f8f | 160 | Expression* nil = Expression::make_nil(location); |
e67508fa | 161 | Expression* zero = Expression::make_integer_ul(0, NULL, location); |
2c809f8f | 162 | return Expression::make_slice_value(lhs_type, nil, zero, zero, location); |
e440a328 | 163 | } |
164 | else if (rhs_type->is_nil_type()) | |
2c809f8f | 165 | return Expression::make_nil(location); |
166 | else if (Type::are_identical(lhs_type, rhs_type, false, NULL)) | |
e440a328 | 167 | { |
168 | // No conversion is needed. | |
2c809f8f | 169 | return rhs; |
170 | } | |
171 | else if (lhs_type->points_to() != NULL) | |
172 | return Expression::make_unsafe_cast(lhs_type, rhs, location); | |
173 | else if (lhs_type->is_numeric_type()) | |
174 | return Expression::make_cast(lhs_type, rhs, location); | |
175 | else if ((lhs_type->struct_type() != NULL | |
176 | && rhs_type->struct_type() != NULL) | |
177 | || (lhs_type->array_type() != NULL | |
178 | && rhs_type->array_type() != NULL)) | |
e440a328 | 179 | { |
bb92f513 | 180 | // Avoid confusion from zero sized variables which may be |
181 | // represented as non-zero-sized. | |
2c809f8f | 182 | // TODO(cmang): This check is for a GCC-specific issue, and should be |
183 | // removed from the frontend. FIXME. | |
184 | size_t lhs_size = gogo->backend()->type_size(lhs_type->get_backend(gogo)); | |
185 | size_t rhs_size = gogo->backend()->type_size(rhs_type->get_backend(gogo)); | |
186 | if (rhs_size == 0 || lhs_size == 0) | |
187 | return rhs; | |
bb92f513 | 188 | |
e440a328 | 189 | // This conversion must be permitted by Go, or we wouldn't have |
190 | // gotten here. | |
2c809f8f | 191 | return Expression::make_unsafe_cast(lhs_type, rhs, location); |
e440a328 | 192 | } |
193 | else | |
2c809f8f | 194 | return rhs; |
e440a328 | 195 | } |
196 | ||
2c809f8f | 197 | // Return an expression for a conversion from a non-interface type to an |
e440a328 | 198 | // interface type. |
199 | ||
2c809f8f | 200 | Expression* |
201 | Expression::convert_type_to_interface(Type* lhs_type, Expression* rhs, | |
202 | Location location) | |
e440a328 | 203 | { |
e440a328 | 204 | Interface_type* lhs_interface_type = lhs_type->interface_type(); |
205 | bool lhs_is_empty = lhs_interface_type->is_empty(); | |
206 | ||
207 | // Since RHS_TYPE is a static type, we can create the interface | |
208 | // method table at compile time. | |
209 | ||
210 | // When setting an interface to nil, we just set both fields to | |
211 | // NULL. | |
2c809f8f | 212 | Type* rhs_type = rhs->type(); |
e440a328 | 213 | if (rhs_type->is_nil_type()) |
63697958 | 214 | { |
2c809f8f | 215 | Expression* nil = Expression::make_nil(location); |
216 | return Expression::make_interface_value(lhs_type, nil, nil, location); | |
63697958 | 217 | } |
e440a328 | 218 | |
219 | // This should have been checked already. | |
c484d925 | 220 | go_assert(lhs_interface_type->implements_interface(rhs_type, NULL)); |
e440a328 | 221 | |
e440a328 | 222 | // An interface is a tuple. If LHS_TYPE is an empty interface type, |
223 | // then the first field is the type descriptor for RHS_TYPE. | |
224 | // Otherwise it is the interface method table for RHS_TYPE. | |
2c809f8f | 225 | Expression* first_field; |
e440a328 | 226 | if (lhs_is_empty) |
2c809f8f | 227 | first_field = Expression::make_type_descriptor(rhs_type, location); |
e440a328 | 228 | else |
229 | { | |
230 | // Build the interface method table for this interface and this | |
231 | // object type: a list of function pointers for each interface | |
232 | // method. | |
233 | Named_type* rhs_named_type = rhs_type->named_type(); | |
c0cab2ec | 234 | Struct_type* rhs_struct_type = rhs_type->struct_type(); |
e440a328 | 235 | bool is_pointer = false; |
c0cab2ec | 236 | if (rhs_named_type == NULL && rhs_struct_type == NULL) |
e440a328 | 237 | { |
238 | rhs_named_type = rhs_type->deref()->named_type(); | |
c0cab2ec | 239 | rhs_struct_type = rhs_type->deref()->struct_type(); |
e440a328 | 240 | is_pointer = true; |
241 | } | |
c0cab2ec | 242 | if (rhs_named_type != NULL) |
2c809f8f | 243 | first_field = |
244 | rhs_named_type->interface_method_table(lhs_interface_type, | |
245 | is_pointer); | |
c0cab2ec | 246 | else if (rhs_struct_type != NULL) |
2c809f8f | 247 | first_field = |
248 | rhs_struct_type->interface_method_table(lhs_interface_type, | |
249 | is_pointer); | |
c0cab2ec | 250 | else |
2c809f8f | 251 | first_field = Expression::make_nil(location); |
e440a328 | 252 | } |
e440a328 | 253 | |
2c809f8f | 254 | Expression* obj; |
e440a328 | 255 | if (rhs_type->points_to() != NULL) |
256 | { | |
2c809f8f | 257 | // We are assigning a pointer to the interface; the interface |
e440a328 | 258 | // holds the pointer itself. |
2c809f8f | 259 | obj = rhs; |
260 | } | |
261 | else | |
262 | { | |
263 | // We are assigning a non-pointer value to the interface; the | |
264 | // interface gets a copy of the value in the heap. | |
265 | obj = Expression::make_heap_expression(rhs, location); | |
e440a328 | 266 | } |
267 | ||
2c809f8f | 268 | return Expression::make_interface_value(lhs_type, first_field, obj, location); |
269 | } | |
e440a328 | 270 | |
2c809f8f | 271 | // Return an expression for the type descriptor of RHS. |
e440a328 | 272 | |
2c809f8f | 273 | Expression* |
274 | Expression::get_interface_type_descriptor(Expression* rhs) | |
275 | { | |
276 | go_assert(rhs->type()->interface_type() != NULL); | |
277 | Location location = rhs->location(); | |
e440a328 | 278 | |
2c809f8f | 279 | // The type descriptor is the first field of an empty interface. |
280 | if (rhs->type()->interface_type()->is_empty()) | |
281 | return Expression::make_interface_info(rhs, INTERFACE_INFO_TYPE_DESCRIPTOR, | |
282 | location); | |
283 | ||
284 | Expression* mtable = | |
285 | Expression::make_interface_info(rhs, INTERFACE_INFO_METHODS, location); | |
e440a328 | 286 | |
2c809f8f | 287 | Expression* descriptor = |
288 | Expression::make_unary(OPERATOR_MULT, mtable, location); | |
289 | descriptor = Expression::make_field_reference(descriptor, 0, location); | |
290 | Expression* nil = Expression::make_nil(location); | |
e440a328 | 291 | |
2c809f8f | 292 | Expression* eq = |
293 | Expression::make_binary(OPERATOR_EQEQ, mtable, nil, location); | |
294 | return Expression::make_conditional(eq, nil, descriptor, location); | |
e440a328 | 295 | } |
296 | ||
2c809f8f | 297 | // Return an expression for the conversion of an interface type to an |
e440a328 | 298 | // interface type. |
299 | ||
2c809f8f | 300 | Expression* |
301 | Expression::convert_interface_to_interface(Type *lhs_type, Expression* rhs, | |
302 | bool for_type_guard, | |
303 | Location location) | |
e440a328 | 304 | { |
8ba8cc87 | 305 | if (Type::are_identical(lhs_type, rhs->type(), false, NULL)) |
306 | return rhs; | |
307 | ||
e440a328 | 308 | Interface_type* lhs_interface_type = lhs_type->interface_type(); |
309 | bool lhs_is_empty = lhs_interface_type->is_empty(); | |
310 | ||
e440a328 | 311 | // In the general case this requires runtime examination of the type |
312 | // method table to match it up with the interface methods. | |
313 | ||
314 | // FIXME: If all of the methods in the right hand side interface | |
315 | // also appear in the left hand side interface, then we don't need | |
316 | // to do a runtime check, although we still need to build a new | |
317 | // method table. | |
318 | ||
8ba8cc87 | 319 | // We are going to evaluate RHS multiple times. |
320 | go_assert(rhs->is_variable()); | |
321 | ||
e440a328 | 322 | // Get the type descriptor for the right hand side. This will be |
323 | // NULL for a nil interface. | |
2c809f8f | 324 | Expression* rhs_type_expr = Expression::get_interface_type_descriptor(rhs); |
325 | Expression* lhs_type_expr = | |
326 | Expression::make_type_descriptor(lhs_type, location); | |
e440a328 | 327 | |
2c809f8f | 328 | Expression* first_field; |
e440a328 | 329 | if (for_type_guard) |
330 | { | |
331 | // A type assertion fails when converting a nil interface. | |
2c809f8f | 332 | first_field = |
333 | Runtime::make_call(Runtime::ASSERT_INTERFACE, location, 2, | |
334 | lhs_type_expr, rhs_type_expr); | |
e440a328 | 335 | } |
336 | else if (lhs_is_empty) | |
337 | { | |
2c809f8f | 338 | // A conversion to an empty interface always succeeds, and the |
e440a328 | 339 | // first field is just the type descriptor of the object. |
2c809f8f | 340 | first_field = rhs_type_expr; |
e440a328 | 341 | } |
342 | else | |
343 | { | |
344 | // A conversion to a non-empty interface may fail, but unlike a | |
345 | // type assertion converting nil will always succeed. | |
2c809f8f | 346 | first_field = |
347 | Runtime::make_call(Runtime::CONVERT_INTERFACE, location, 2, | |
348 | lhs_type_expr, rhs_type_expr); | |
e440a328 | 349 | } |
350 | ||
351 | // The second field is simply the object pointer. | |
2c809f8f | 352 | Expression* obj = |
353 | Expression::make_interface_info(rhs, INTERFACE_INFO_OBJECT, location); | |
354 | return Expression::make_interface_value(lhs_type, first_field, obj, location); | |
e440a328 | 355 | } |
356 | ||
2c809f8f | 357 | // Return an expression for the conversion of an interface type to a |
e440a328 | 358 | // non-interface type. |
359 | ||
2c809f8f | 360 | Expression* |
361 | Expression::convert_interface_to_type(Type *lhs_type, Expression* rhs, | |
362 | Location location) | |
e440a328 | 363 | { |
8ba8cc87 | 364 | // We are going to evaluate RHS multiple times. |
365 | go_assert(rhs->is_variable()); | |
366 | ||
e440a328 | 367 | // Call a function to check that the type is valid. The function |
368 | // will panic with an appropriate runtime type error if the type is | |
369 | // not valid. | |
2c809f8f | 370 | Expression* lhs_type_expr = Expression::make_type_descriptor(lhs_type, |
371 | location); | |
372 | Expression* rhs_descriptor = | |
373 | Expression::get_interface_type_descriptor(rhs); | |
374 | ||
375 | Type* rhs_type = rhs->type(); | |
376 | Expression* rhs_inter_expr = Expression::make_type_descriptor(rhs_type, | |
377 | location); | |
378 | ||
379 | Expression* check_iface = Runtime::make_call(Runtime::CHECK_INTERFACE_TYPE, | |
380 | location, 3, lhs_type_expr, | |
381 | rhs_descriptor, rhs_inter_expr); | |
e440a328 | 382 | |
383 | // If the call succeeds, pull out the value. | |
2c809f8f | 384 | Expression* obj = Expression::make_interface_info(rhs, INTERFACE_INFO_OBJECT, |
385 | location); | |
e440a328 | 386 | |
387 | // If the value is a pointer, then it is the value we want. | |
388 | // Otherwise it points to the value. | |
389 | if (lhs_type->points_to() == NULL) | |
390 | { | |
2c809f8f | 391 | obj = Expression::make_unsafe_cast(Type::make_pointer_type(lhs_type), obj, |
392 | location); | |
393 | obj = Expression::make_unary(OPERATOR_MULT, obj, location); | |
e440a328 | 394 | } |
2c809f8f | 395 | return Expression::make_compound(check_iface, obj, location); |
e440a328 | 396 | } |
397 | ||
ea664253 | 398 | // Convert an expression to its backend representation. This is implemented by |
399 | // the child class. Not that it is not in general safe to call this multiple | |
e440a328 | 400 | // times for a single expression, but that we don't catch such errors. |
401 | ||
ea664253 | 402 | Bexpression* |
403 | Expression::get_backend(Translate_context* context) | |
e440a328 | 404 | { |
405 | // The child may have marked this expression as having an error. | |
406 | if (this->classification_ == EXPRESSION_ERROR) | |
ea664253 | 407 | return context->backend()->error_expression(); |
e440a328 | 408 | |
ea664253 | 409 | return this->do_get_backend(context); |
e440a328 | 410 | } |
411 | ||
48c2a53a | 412 | // Return a backend expression for VAL. |
413 | Bexpression* | |
414 | Expression::backend_numeric_constant_expression(Translate_context* context, | |
415 | Numeric_constant* val) | |
e440a328 | 416 | { |
48c2a53a | 417 | Gogo* gogo = context->gogo(); |
418 | Type* type = val->type(); | |
419 | if (type == NULL) | |
420 | return gogo->backend()->error_expression(); | |
e440a328 | 421 | |
48c2a53a | 422 | Btype* btype = type->get_backend(gogo); |
423 | Bexpression* ret; | |
424 | if (type->integer_type() != NULL) | |
e440a328 | 425 | { |
426 | mpz_t ival; | |
48c2a53a | 427 | if (!val->to_int(&ival)) |
428 | { | |
429 | go_assert(saw_errors()); | |
430 | return gogo->backend()->error_expression(); | |
431 | } | |
432 | ret = gogo->backend()->integer_constant_expression(btype, ival); | |
e440a328 | 433 | mpz_clear(ival); |
e440a328 | 434 | } |
48c2a53a | 435 | else if (type->float_type() != NULL) |
e440a328 | 436 | { |
48c2a53a | 437 | mpfr_t fval; |
438 | if (!val->to_float(&fval)) | |
439 | { | |
440 | go_assert(saw_errors()); | |
441 | return gogo->backend()->error_expression(); | |
442 | } | |
443 | ret = gogo->backend()->float_constant_expression(btype, fval); | |
444 | mpfr_clear(fval); | |
e440a328 | 445 | } |
48c2a53a | 446 | else if (type->complex_type() != NULL) |
e440a328 | 447 | { |
fcbea5e4 | 448 | mpc_t cval; |
449 | if (!val->to_complex(&cval)) | |
48c2a53a | 450 | { |
451 | go_assert(saw_errors()); | |
452 | return gogo->backend()->error_expression(); | |
453 | } | |
fcbea5e4 | 454 | ret = gogo->backend()->complex_constant_expression(btype, cval); |
455 | mpc_clear(cval); | |
e440a328 | 456 | } |
457 | else | |
c3e6f413 | 458 | go_unreachable(); |
e440a328 | 459 | |
48c2a53a | 460 | return ret; |
e440a328 | 461 | } |
462 | ||
2c809f8f | 463 | // Return an expression which evaluates to true if VAL, of arbitrary integer |
464 | // type, is negative or is more than the maximum value of the Go type "int". | |
e440a328 | 465 | |
2c809f8f | 466 | Expression* |
467 | Expression::check_bounds(Expression* val, Location loc) | |
e440a328 | 468 | { |
2c809f8f | 469 | Type* val_type = val->type(); |
470 | Type* bound_type = Type::lookup_integer_type("int"); | |
471 | ||
472 | int val_type_size; | |
473 | bool val_is_unsigned = false; | |
474 | if (val_type->integer_type() != NULL) | |
475 | { | |
476 | val_type_size = val_type->integer_type()->bits(); | |
477 | val_is_unsigned = val_type->integer_type()->is_unsigned(); | |
478 | } | |
479 | else | |
480 | { | |
481 | if (!val_type->is_numeric_type() | |
482 | || !Type::are_convertible(bound_type, val_type, NULL)) | |
483 | { | |
484 | go_assert(saw_errors()); | |
485 | return Expression::make_boolean(true, loc); | |
486 | } | |
e440a328 | 487 | |
2c809f8f | 488 | if (val_type->complex_type() != NULL) |
489 | val_type_size = val_type->complex_type()->bits(); | |
490 | else | |
491 | val_type_size = val_type->float_type()->bits(); | |
492 | } | |
493 | ||
494 | Expression* negative_index = Expression::make_boolean(false, loc); | |
495 | Expression* index_overflows = Expression::make_boolean(false, loc); | |
496 | if (!val_is_unsigned) | |
e440a328 | 497 | { |
e67508fa | 498 | Expression* zero = Expression::make_integer_ul(0, val_type, loc); |
2c809f8f | 499 | negative_index = Expression::make_binary(OPERATOR_LT, val, zero, loc); |
e440a328 | 500 | } |
501 | ||
2c809f8f | 502 | int bound_type_size = bound_type->integer_type()->bits(); |
c3068ac0 | 503 | if (val_type_size > bound_type_size |
504 | || (val_type_size == bound_type_size | |
2c809f8f | 505 | && val_is_unsigned)) |
506 | { | |
507 | mpz_t one; | |
508 | mpz_init_set_ui(one, 1UL); | |
509 | ||
510 | // maxval = 2^(bound_type_size - 1) - 1 | |
511 | mpz_t maxval; | |
512 | mpz_init(maxval); | |
513 | mpz_mul_2exp(maxval, one, bound_type_size - 1); | |
514 | mpz_sub_ui(maxval, maxval, 1); | |
e67508fa | 515 | Expression* max = Expression::make_integer_z(&maxval, val_type, loc); |
2c809f8f | 516 | mpz_clear(one); |
517 | mpz_clear(maxval); | |
518 | ||
519 | index_overflows = Expression::make_binary(OPERATOR_GT, val, max, loc); | |
e440a328 | 520 | } |
521 | ||
2c809f8f | 522 | return Expression::make_binary(OPERATOR_OROR, negative_index, index_overflows, |
523 | loc); | |
e440a328 | 524 | } |
525 | ||
d751bb78 | 526 | void |
527 | Expression::dump_expression(Ast_dump_context* ast_dump_context) const | |
528 | { | |
529 | this->do_dump_expression(ast_dump_context); | |
530 | } | |
531 | ||
e440a328 | 532 | // Error expressions. This are used to avoid cascading errors. |
533 | ||
534 | class Error_expression : public Expression | |
535 | { | |
536 | public: | |
b13c66cd | 537 | Error_expression(Location location) |
e440a328 | 538 | : Expression(EXPRESSION_ERROR, location) |
539 | { } | |
540 | ||
541 | protected: | |
542 | bool | |
543 | do_is_constant() const | |
544 | { return true; } | |
545 | ||
0e168074 | 546 | bool |
547 | do_is_immutable() const | |
548 | { return true; } | |
549 | ||
e440a328 | 550 | bool |
0c77715b | 551 | do_numeric_constant_value(Numeric_constant* nc) const |
e440a328 | 552 | { |
0c77715b | 553 | nc->set_unsigned_long(NULL, 0); |
e440a328 | 554 | return true; |
555 | } | |
556 | ||
4f2138d7 | 557 | bool |
e440a328 | 558 | do_discarding_value() |
4f2138d7 | 559 | { return true; } |
e440a328 | 560 | |
561 | Type* | |
562 | do_type() | |
563 | { return Type::make_error_type(); } | |
564 | ||
565 | void | |
566 | do_determine_type(const Type_context*) | |
567 | { } | |
568 | ||
569 | Expression* | |
570 | do_copy() | |
571 | { return this; } | |
572 | ||
573 | bool | |
574 | do_is_addressable() const | |
575 | { return true; } | |
576 | ||
ea664253 | 577 | Bexpression* |
578 | do_get_backend(Translate_context* context) | |
579 | { return context->backend()->error_expression(); } | |
d751bb78 | 580 | |
581 | void | |
582 | do_dump_expression(Ast_dump_context*) const; | |
e440a328 | 583 | }; |
584 | ||
d751bb78 | 585 | // Dump the ast representation for an error expression to a dump context. |
586 | ||
587 | void | |
588 | Error_expression::do_dump_expression(Ast_dump_context* ast_dump_context) const | |
589 | { | |
590 | ast_dump_context->ostream() << "_Error_" ; | |
591 | } | |
592 | ||
e440a328 | 593 | Expression* |
b13c66cd | 594 | Expression::make_error(Location location) |
e440a328 | 595 | { |
596 | return new Error_expression(location); | |
597 | } | |
598 | ||
599 | // An expression which is really a type. This is used during parsing. | |
600 | // It is an error if these survive after lowering. | |
601 | ||
602 | class | |
603 | Type_expression : public Expression | |
604 | { | |
605 | public: | |
b13c66cd | 606 | Type_expression(Type* type, Location location) |
e440a328 | 607 | : Expression(EXPRESSION_TYPE, location), |
608 | type_(type) | |
609 | { } | |
610 | ||
611 | protected: | |
612 | int | |
613 | do_traverse(Traverse* traverse) | |
614 | { return Type::traverse(this->type_, traverse); } | |
615 | ||
616 | Type* | |
617 | do_type() | |
618 | { return this->type_; } | |
619 | ||
620 | void | |
621 | do_determine_type(const Type_context*) | |
622 | { } | |
623 | ||
624 | void | |
625 | do_check_types(Gogo*) | |
626 | { this->report_error(_("invalid use of type")); } | |
627 | ||
628 | Expression* | |
629 | do_copy() | |
630 | { return this; } | |
631 | ||
ea664253 | 632 | Bexpression* |
633 | do_get_backend(Translate_context*) | |
c3e6f413 | 634 | { go_unreachable(); } |
e440a328 | 635 | |
d751bb78 | 636 | void do_dump_expression(Ast_dump_context*) const; |
637 | ||
e440a328 | 638 | private: |
639 | // The type which we are representing as an expression. | |
640 | Type* type_; | |
641 | }; | |
642 | ||
d751bb78 | 643 | void |
644 | Type_expression::do_dump_expression(Ast_dump_context* ast_dump_context) const | |
645 | { | |
646 | ast_dump_context->dump_type(this->type_); | |
647 | } | |
648 | ||
e440a328 | 649 | Expression* |
b13c66cd | 650 | Expression::make_type(Type* type, Location location) |
e440a328 | 651 | { |
652 | return new Type_expression(type, location); | |
653 | } | |
654 | ||
e03bdf36 | 655 | // Class Parser_expression. |
656 | ||
657 | Type* | |
658 | Parser_expression::do_type() | |
659 | { | |
660 | // We should never really ask for the type of a Parser_expression. | |
661 | // However, it can happen, at least when we have an invalid const | |
662 | // whose initializer refers to the const itself. In that case we | |
663 | // may ask for the type when lowering the const itself. | |
c484d925 | 664 | go_assert(saw_errors()); |
e03bdf36 | 665 | return Type::make_error_type(); |
666 | } | |
667 | ||
e440a328 | 668 | // Class Var_expression. |
669 | ||
670 | // Lower a variable expression. Here we just make sure that the | |
671 | // initialization expression of the variable has been lowered. This | |
672 | // ensures that we will be able to determine the type of the variable | |
673 | // if necessary. | |
674 | ||
675 | Expression* | |
ceeb4318 | 676 | Var_expression::do_lower(Gogo* gogo, Named_object* function, |
677 | Statement_inserter* inserter, int) | |
e440a328 | 678 | { |
679 | if (this->variable_->is_variable()) | |
680 | { | |
681 | Variable* var = this->variable_->var_value(); | |
682 | // This is either a local variable or a global variable. A | |
683 | // reference to a variable which is local to an enclosing | |
684 | // function will be a reference to a field in a closure. | |
685 | if (var->is_global()) | |
ceeb4318 | 686 | { |
687 | function = NULL; | |
688 | inserter = NULL; | |
689 | } | |
690 | var->lower_init_expression(gogo, function, inserter); | |
e440a328 | 691 | } |
692 | return this; | |
693 | } | |
694 | ||
e440a328 | 695 | // Return the type of a reference to a variable. |
696 | ||
697 | Type* | |
698 | Var_expression::do_type() | |
699 | { | |
700 | if (this->variable_->is_variable()) | |
701 | return this->variable_->var_value()->type(); | |
702 | else if (this->variable_->is_result_variable()) | |
703 | return this->variable_->result_var_value()->type(); | |
704 | else | |
c3e6f413 | 705 | go_unreachable(); |
e440a328 | 706 | } |
707 | ||
0ab09e06 | 708 | // Determine the type of a reference to a variable. |
709 | ||
710 | void | |
711 | Var_expression::do_determine_type(const Type_context*) | |
712 | { | |
713 | if (this->variable_->is_variable()) | |
714 | this->variable_->var_value()->determine_type(); | |
715 | } | |
716 | ||
e440a328 | 717 | // Something takes the address of this variable. This means that we |
718 | // may want to move the variable onto the heap. | |
719 | ||
720 | void | |
721 | Var_expression::do_address_taken(bool escapes) | |
722 | { | |
723 | if (!escapes) | |
f325319b | 724 | { |
725 | if (this->variable_->is_variable()) | |
726 | this->variable_->var_value()->set_non_escaping_address_taken(); | |
727 | else if (this->variable_->is_result_variable()) | |
728 | this->variable_->result_var_value()->set_non_escaping_address_taken(); | |
729 | else | |
730 | go_unreachable(); | |
731 | } | |
e440a328 | 732 | else |
f325319b | 733 | { |
734 | if (this->variable_->is_variable()) | |
735 | this->variable_->var_value()->set_address_taken(); | |
736 | else if (this->variable_->is_result_variable()) | |
737 | this->variable_->result_var_value()->set_address_taken(); | |
738 | else | |
739 | go_unreachable(); | |
740 | } | |
e440a328 | 741 | } |
742 | ||
ea664253 | 743 | // Get the backend representation for a reference to a variable. |
e440a328 | 744 | |
ea664253 | 745 | Bexpression* |
746 | Var_expression::do_get_backend(Translate_context* context) | |
e440a328 | 747 | { |
fe2f84cf | 748 | Bvariable* bvar = this->variable_->get_backend_variable(context->gogo(), |
749 | context->function()); | |
fe2f84cf | 750 | bool is_in_heap; |
c6777780 | 751 | Location loc = this->location(); |
9b27b43c | 752 | Btype* btype; |
753 | Gogo* gogo = context->gogo(); | |
fe2f84cf | 754 | if (this->variable_->is_variable()) |
9b27b43c | 755 | { |
756 | is_in_heap = this->variable_->var_value()->is_in_heap(); | |
757 | btype = this->variable_->var_value()->type()->get_backend(gogo); | |
758 | } | |
fe2f84cf | 759 | else if (this->variable_->is_result_variable()) |
9b27b43c | 760 | { |
761 | is_in_heap = this->variable_->result_var_value()->is_in_heap(); | |
762 | btype = this->variable_->result_var_value()->type()->get_backend(gogo); | |
763 | } | |
fe2f84cf | 764 | else |
c3e6f413 | 765 | go_unreachable(); |
c6777780 | 766 | |
767 | Bexpression* ret = context->backend()->var_expression(bvar, loc); | |
fe2f84cf | 768 | if (is_in_heap) |
9b27b43c | 769 | ret = context->backend()->indirect_expression(btype, ret, true, loc); |
ea664253 | 770 | return ret; |
e440a328 | 771 | } |
772 | ||
d751bb78 | 773 | // Ast dump for variable expression. |
774 | ||
775 | void | |
776 | Var_expression::do_dump_expression(Ast_dump_context* ast_dump_context) const | |
777 | { | |
778 | ast_dump_context->ostream() << this->variable_->name() ; | |
779 | } | |
780 | ||
e440a328 | 781 | // Make a reference to a variable in an expression. |
782 | ||
783 | Expression* | |
b13c66cd | 784 | Expression::make_var_reference(Named_object* var, Location location) |
e440a328 | 785 | { |
786 | if (var->is_sink()) | |
787 | return Expression::make_sink(location); | |
788 | ||
789 | // FIXME: Creating a new object for each reference to a variable is | |
790 | // wasteful. | |
791 | return new Var_expression(var, location); | |
792 | } | |
793 | ||
794 | // Class Temporary_reference_expression. | |
795 | ||
796 | // The type. | |
797 | ||
798 | Type* | |
799 | Temporary_reference_expression::do_type() | |
800 | { | |
801 | return this->statement_->type(); | |
802 | } | |
803 | ||
804 | // Called if something takes the address of this temporary variable. | |
805 | // We never have to move temporary variables to the heap, but we do | |
806 | // need to know that they must live in the stack rather than in a | |
807 | // register. | |
808 | ||
809 | void | |
810 | Temporary_reference_expression::do_address_taken(bool) | |
811 | { | |
812 | this->statement_->set_is_address_taken(); | |
813 | } | |
814 | ||
ea664253 | 815 | // Get a backend expression referring to the variable. |
e440a328 | 816 | |
ea664253 | 817 | Bexpression* |
818 | Temporary_reference_expression::do_get_backend(Translate_context* context) | |
e440a328 | 819 | { |
cd440cff | 820 | Gogo* gogo = context->gogo(); |
eefc1ed3 | 821 | Bvariable* bvar = this->statement_->get_backend_variable(context); |
cd440cff | 822 | Bexpression* ret = gogo->backend()->var_expression(bvar, this->location()); |
eefc1ed3 | 823 | |
cd440cff | 824 | // The backend can't always represent the same set of recursive types |
eefc1ed3 | 825 | // that the Go frontend can. In some cases this means that a |
826 | // temporary variable won't have the right backend type. Correct | |
827 | // that here by adding a type cast. We need to use base() to push | |
828 | // the circularity down one level. | |
cd440cff | 829 | Type* stype = this->statement_->type(); |
ceeb4318 | 830 | if (!this->is_lvalue_ |
cd440cff | 831 | && stype->has_pointer() |
832 | && stype->deref()->is_void_type()) | |
eefc1ed3 | 833 | { |
cd440cff | 834 | Btype* btype = this->type()->base()->get_backend(gogo); |
835 | ret = gogo->backend()->convert_expression(btype, ret, this->location()); | |
eefc1ed3 | 836 | } |
ea664253 | 837 | return ret; |
e440a328 | 838 | } |
839 | ||
d751bb78 | 840 | // Ast dump for temporary reference. |
841 | ||
842 | void | |
843 | Temporary_reference_expression::do_dump_expression( | |
844 | Ast_dump_context* ast_dump_context) const | |
845 | { | |
846 | ast_dump_context->dump_temp_variable_name(this->statement_); | |
847 | } | |
848 | ||
e440a328 | 849 | // Make a reference to a temporary variable. |
850 | ||
ceeb4318 | 851 | Temporary_reference_expression* |
e440a328 | 852 | Expression::make_temporary_reference(Temporary_statement* statement, |
b13c66cd | 853 | Location location) |
e440a328 | 854 | { |
855 | return new Temporary_reference_expression(statement, location); | |
856 | } | |
857 | ||
e9d3367e | 858 | // Class Set_and_use_temporary_expression. |
859 | ||
860 | // Return the type. | |
861 | ||
862 | Type* | |
863 | Set_and_use_temporary_expression::do_type() | |
864 | { | |
865 | return this->statement_->type(); | |
866 | } | |
867 | ||
0afbb937 | 868 | // Determine the type of the expression. |
869 | ||
870 | void | |
871 | Set_and_use_temporary_expression::do_determine_type( | |
872 | const Type_context* context) | |
873 | { | |
874 | this->expr_->determine_type(context); | |
875 | } | |
876 | ||
e9d3367e | 877 | // Take the address. |
878 | ||
879 | void | |
880 | Set_and_use_temporary_expression::do_address_taken(bool) | |
881 | { | |
882 | this->statement_->set_is_address_taken(); | |
883 | } | |
884 | ||
885 | // Return the backend representation. | |
886 | ||
ea664253 | 887 | Bexpression* |
888 | Set_and_use_temporary_expression::do_get_backend(Translate_context* context) | |
e9d3367e | 889 | { |
e9d3367e | 890 | Location loc = this->location(); |
a302c105 | 891 | Gogo* gogo = context->gogo(); |
892 | Bvariable* bvar = this->statement_->get_backend_variable(context); | |
893 | Bexpression* var_ref = gogo->backend()->var_expression(bvar, loc); | |
894 | ||
ea664253 | 895 | Bexpression* bexpr = this->expr_->get_backend(context); |
a302c105 | 896 | Bstatement* set = gogo->backend()->assignment_statement(var_ref, bexpr, loc); |
897 | var_ref = gogo->backend()->var_expression(bvar, loc); | |
898 | Bexpression* ret = gogo->backend()->compound_expression(set, var_ref, loc); | |
ea664253 | 899 | return ret; |
e9d3367e | 900 | } |
901 | ||
902 | // Dump. | |
903 | ||
904 | void | |
905 | Set_and_use_temporary_expression::do_dump_expression( | |
906 | Ast_dump_context* ast_dump_context) const | |
907 | { | |
908 | ast_dump_context->ostream() << '('; | |
909 | ast_dump_context->dump_temp_variable_name(this->statement_); | |
910 | ast_dump_context->ostream() << " = "; | |
911 | this->expr_->dump_expression(ast_dump_context); | |
912 | ast_dump_context->ostream() << ')'; | |
913 | } | |
914 | ||
915 | // Make a set-and-use temporary. | |
916 | ||
917 | Set_and_use_temporary_expression* | |
918 | Expression::make_set_and_use_temporary(Temporary_statement* statement, | |
919 | Expression* expr, Location location) | |
920 | { | |
921 | return new Set_and_use_temporary_expression(statement, expr, location); | |
922 | } | |
923 | ||
e440a328 | 924 | // A sink expression--a use of the blank identifier _. |
925 | ||
926 | class Sink_expression : public Expression | |
927 | { | |
928 | public: | |
b13c66cd | 929 | Sink_expression(Location location) |
e440a328 | 930 | : Expression(EXPRESSION_SINK, location), |
aa93217a | 931 | type_(NULL), bvar_(NULL) |
e440a328 | 932 | { } |
933 | ||
934 | protected: | |
4f2138d7 | 935 | bool |
e440a328 | 936 | do_discarding_value() |
4f2138d7 | 937 | { return true; } |
e440a328 | 938 | |
939 | Type* | |
940 | do_type(); | |
941 | ||
942 | void | |
943 | do_determine_type(const Type_context*); | |
944 | ||
945 | Expression* | |
946 | do_copy() | |
947 | { return new Sink_expression(this->location()); } | |
948 | ||
ea664253 | 949 | Bexpression* |
950 | do_get_backend(Translate_context*); | |
e440a328 | 951 | |
d751bb78 | 952 | void |
953 | do_dump_expression(Ast_dump_context*) const; | |
954 | ||
e440a328 | 955 | private: |
956 | // The type of this sink variable. | |
957 | Type* type_; | |
958 | // The temporary variable we generate. | |
aa93217a | 959 | Bvariable* bvar_; |
e440a328 | 960 | }; |
961 | ||
962 | // Return the type of a sink expression. | |
963 | ||
964 | Type* | |
965 | Sink_expression::do_type() | |
966 | { | |
967 | if (this->type_ == NULL) | |
968 | return Type::make_sink_type(); | |
969 | return this->type_; | |
970 | } | |
971 | ||
972 | // Determine the type of a sink expression. | |
973 | ||
974 | void | |
975 | Sink_expression::do_determine_type(const Type_context* context) | |
976 | { | |
977 | if (context->type != NULL) | |
978 | this->type_ = context->type; | |
979 | } | |
980 | ||
981 | // Return a temporary variable for a sink expression. This will | |
982 | // presumably be a write-only variable which the middle-end will drop. | |
983 | ||
ea664253 | 984 | Bexpression* |
985 | Sink_expression::do_get_backend(Translate_context* context) | |
e440a328 | 986 | { |
aa93217a | 987 | Location loc = this->location(); |
988 | Gogo* gogo = context->gogo(); | |
989 | if (this->bvar_ == NULL) | |
e440a328 | 990 | { |
c484d925 | 991 | go_assert(this->type_ != NULL && !this->type_->is_sink_type()); |
aa93217a | 992 | Named_object* fn = context->function(); |
993 | go_assert(fn != NULL); | |
994 | Bfunction* fn_ctx = fn->func_value()->get_or_make_decl(gogo, fn); | |
9f0e0513 | 995 | Btype* bt = this->type_->get_backend(context->gogo()); |
aa93217a | 996 | Bstatement* decl; |
997 | this->bvar_ = | |
998 | gogo->backend()->temporary_variable(fn_ctx, context->bblock(), bt, NULL, | |
999 | false, loc, &decl); | |
1000 | Bexpression* var_ref = gogo->backend()->var_expression(this->bvar_, loc); | |
1001 | var_ref = gogo->backend()->compound_expression(decl, var_ref, loc); | |
ea664253 | 1002 | return var_ref; |
e440a328 | 1003 | } |
ea664253 | 1004 | return gogo->backend()->var_expression(this->bvar_, loc); |
e440a328 | 1005 | } |
1006 | ||
d751bb78 | 1007 | // Ast dump for sink expression. |
1008 | ||
1009 | void | |
1010 | Sink_expression::do_dump_expression(Ast_dump_context* ast_dump_context) const | |
1011 | { | |
1012 | ast_dump_context->ostream() << "_" ; | |
1013 | } | |
1014 | ||
e440a328 | 1015 | // Make a sink expression. |
1016 | ||
1017 | Expression* | |
b13c66cd | 1018 | Expression::make_sink(Location location) |
e440a328 | 1019 | { |
1020 | return new Sink_expression(location); | |
1021 | } | |
1022 | ||
1023 | // Class Func_expression. | |
1024 | ||
1025 | // FIXME: Can a function expression appear in a constant expression? | |
1026 | // The value is unchanging. Initializing a constant to the address of | |
1027 | // a function seems like it could work, though there might be little | |
1028 | // point to it. | |
1029 | ||
e440a328 | 1030 | // Traversal. |
1031 | ||
1032 | int | |
1033 | Func_expression::do_traverse(Traverse* traverse) | |
1034 | { | |
1035 | return (this->closure_ == NULL | |
1036 | ? TRAVERSE_CONTINUE | |
1037 | : Expression::traverse(&this->closure_, traverse)); | |
1038 | } | |
1039 | ||
1040 | // Return the type of a function expression. | |
1041 | ||
1042 | Type* | |
1043 | Func_expression::do_type() | |
1044 | { | |
1045 | if (this->function_->is_function()) | |
1046 | return this->function_->func_value()->type(); | |
1047 | else if (this->function_->is_function_declaration()) | |
1048 | return this->function_->func_declaration_value()->type(); | |
1049 | else | |
c3e6f413 | 1050 | go_unreachable(); |
e440a328 | 1051 | } |
1052 | ||
ea664253 | 1053 | // Get the backend representation for the code of a function expression. |
e440a328 | 1054 | |
97267c39 | 1055 | Bexpression* |
8381eda7 | 1056 | Func_expression::get_code_pointer(Gogo* gogo, Named_object* no, Location loc) |
e440a328 | 1057 | { |
1058 | Function_type* fntype; | |
8381eda7 | 1059 | if (no->is_function()) |
1060 | fntype = no->func_value()->type(); | |
1061 | else if (no->is_function_declaration()) | |
1062 | fntype = no->func_declaration_value()->type(); | |
e440a328 | 1063 | else |
c3e6f413 | 1064 | go_unreachable(); |
e440a328 | 1065 | |
1066 | // Builtin functions are handled specially by Call_expression. We | |
1067 | // can't take their address. | |
1068 | if (fntype->is_builtin()) | |
1069 | { | |
8381eda7 | 1070 | error_at(loc, |
cb0e02f3 | 1071 | "invalid use of special builtin function %qs; must be called", |
8381eda7 | 1072 | no->message_name().c_str()); |
97267c39 | 1073 | return gogo->backend()->error_expression(); |
e440a328 | 1074 | } |
1075 | ||
97267c39 | 1076 | Bfunction* fndecl; |
e440a328 | 1077 | if (no->is_function()) |
cf3cae55 | 1078 | fndecl = no->func_value()->get_or_make_decl(gogo, no); |
e440a328 | 1079 | else if (no->is_function_declaration()) |
cf3cae55 | 1080 | fndecl = no->func_declaration_value()->get_or_make_decl(gogo, no); |
e440a328 | 1081 | else |
c3e6f413 | 1082 | go_unreachable(); |
e440a328 | 1083 | |
97267c39 | 1084 | return gogo->backend()->function_code_expression(fndecl, loc); |
e440a328 | 1085 | } |
1086 | ||
ea664253 | 1087 | // Get the backend representation for a function expression. This is used when |
1088 | // we take the address of a function rather than simply calling it. A func | |
8381eda7 | 1089 | // value is represented as a pointer to a block of memory. The first |
1090 | // word of that memory is a pointer to the function code. The | |
1091 | // remaining parts of that memory are the addresses of variables that | |
1092 | // the function closes over. | |
e440a328 | 1093 | |
ea664253 | 1094 | Bexpression* |
1095 | Func_expression::do_get_backend(Translate_context* context) | |
e440a328 | 1096 | { |
8381eda7 | 1097 | // If there is no closure, just use the function descriptor. |
2010c17a | 1098 | if (this->closure_ == NULL) |
8381eda7 | 1099 | { |
1100 | Gogo* gogo = context->gogo(); | |
1101 | Named_object* no = this->function_; | |
1102 | Expression* descriptor; | |
1103 | if (no->is_function()) | |
1104 | descriptor = no->func_value()->descriptor(gogo, no); | |
1105 | else if (no->is_function_declaration()) | |
1106 | { | |
1107 | if (no->func_declaration_value()->type()->is_builtin()) | |
1108 | { | |
1109 | error_at(this->location(), | |
1110 | ("invalid use of special builtin function %qs; " | |
1111 | "must be called"), | |
1112 | no->message_name().c_str()); | |
ea664253 | 1113 | return gogo->backend()->error_expression(); |
8381eda7 | 1114 | } |
1115 | descriptor = no->func_declaration_value()->descriptor(gogo, no); | |
1116 | } | |
1117 | else | |
1118 | go_unreachable(); | |
2010c17a | 1119 | |
ea664253 | 1120 | Bexpression* bdesc = descriptor->get_backend(context); |
1121 | return gogo->backend()->address_expression(bdesc, this->location()); | |
8381eda7 | 1122 | } |
e440a328 | 1123 | |
8381eda7 | 1124 | go_assert(this->function_->func_value()->enclosing() != NULL); |
e440a328 | 1125 | |
8381eda7 | 1126 | // If there is a closure, then the closure is itself the function |
1127 | // expression. It is a pointer to a struct whose first field points | |
1128 | // to the function code and whose remaining fields are the addresses | |
1129 | // of the closed-over variables. | |
ea664253 | 1130 | return this->closure_->get_backend(context); |
e440a328 | 1131 | } |
1132 | ||
d751bb78 | 1133 | // Ast dump for function. |
1134 | ||
1135 | void | |
1136 | Func_expression::do_dump_expression(Ast_dump_context* ast_dump_context) const | |
1137 | { | |
8b1c301d | 1138 | ast_dump_context->ostream() << this->function_->name(); |
1139 | if (this->closure_ != NULL) | |
1140 | { | |
1141 | ast_dump_context->ostream() << " {closure = "; | |
1142 | this->closure_->dump_expression(ast_dump_context); | |
1143 | ast_dump_context->ostream() << "}"; | |
1144 | } | |
d751bb78 | 1145 | } |
1146 | ||
e440a328 | 1147 | // Make a reference to a function in an expression. |
1148 | ||
1149 | Expression* | |
1150 | Expression::make_func_reference(Named_object* function, Expression* closure, | |
b13c66cd | 1151 | Location location) |
e440a328 | 1152 | { |
1153 | return new Func_expression(function, closure, location); | |
1154 | } | |
1155 | ||
c6837989 | 1156 | // Class Func_descriptor_expression. |
8381eda7 | 1157 | |
c6837989 | 1158 | // Constructor. |
8381eda7 | 1159 | |
c6837989 | 1160 | Func_descriptor_expression::Func_descriptor_expression(Named_object* fn) |
1161 | : Expression(EXPRESSION_FUNC_DESCRIPTOR, fn->location()), | |
f8bdf81a | 1162 | fn_(fn), dvar_(NULL) |
c6837989 | 1163 | { |
1164 | go_assert(!fn->is_function() || !fn->func_value()->needs_closure()); | |
1165 | } | |
8381eda7 | 1166 | |
c6837989 | 1167 | // Traversal. |
8381eda7 | 1168 | |
c6837989 | 1169 | int |
1170 | Func_descriptor_expression::do_traverse(Traverse*) | |
1171 | { | |
1172 | return TRAVERSE_CONTINUE; | |
1173 | } | |
8381eda7 | 1174 | |
1175 | // All function descriptors have the same type. | |
1176 | ||
1177 | Type* Func_descriptor_expression::descriptor_type; | |
1178 | ||
1179 | void | |
1180 | Func_descriptor_expression::make_func_descriptor_type() | |
1181 | { | |
1182 | if (Func_descriptor_expression::descriptor_type != NULL) | |
1183 | return; | |
1184 | Type* uintptr_type = Type::lookup_integer_type("uintptr"); | |
1185 | Type* struct_type = Type::make_builtin_struct_type(1, "code", uintptr_type); | |
1186 | Func_descriptor_expression::descriptor_type = | |
1187 | Type::make_builtin_named_type("functionDescriptor", struct_type); | |
1188 | } | |
1189 | ||
1190 | Type* | |
1191 | Func_descriptor_expression::do_type() | |
1192 | { | |
1193 | Func_descriptor_expression::make_func_descriptor_type(); | |
1194 | return Func_descriptor_expression::descriptor_type; | |
1195 | } | |
1196 | ||
ea664253 | 1197 | // The backend representation for a function descriptor. |
8381eda7 | 1198 | |
ea664253 | 1199 | Bexpression* |
1200 | Func_descriptor_expression::do_get_backend(Translate_context* context) | |
8381eda7 | 1201 | { |
8381eda7 | 1202 | Named_object* no = this->fn_; |
1203 | Location loc = no->location(); | |
ea664253 | 1204 | if (this->dvar_ != NULL) |
1205 | return context->backend()->var_expression(this->dvar_, loc); | |
8381eda7 | 1206 | |
ea664253 | 1207 | Gogo* gogo = context->gogo(); |
8381eda7 | 1208 | std::string var_name; |
1209 | if (no->package() == NULL) | |
1210 | var_name = gogo->pkgpath_symbol(); | |
1211 | else | |
1212 | var_name = no->package()->pkgpath_symbol(); | |
1213 | var_name.push_back('.'); | |
1214 | var_name.append(Gogo::unpack_hidden_name(no->name())); | |
1215 | var_name.append("$descriptor"); | |
1216 | ||
1217 | Btype* btype = this->type()->get_backend(gogo); | |
1218 | ||
1219 | Bvariable* bvar; | |
1220 | if (no->package() != NULL | |
1221 | || Linemap::is_predeclared_location(no->location())) | |
f8bdf81a | 1222 | bvar = context->backend()->immutable_struct_reference(var_name, btype, |
1223 | loc); | |
8381eda7 | 1224 | else |
1225 | { | |
1226 | Location bloc = Linemap::predeclared_location(); | |
1227 | bool is_hidden = ((no->is_function() | |
1228 | && no->func_value()->enclosing() != NULL) | |
1229 | || Gogo::is_thunk(no)); | |
1230 | bvar = context->backend()->immutable_struct(var_name, is_hidden, false, | |
1231 | btype, bloc); | |
1232 | Expression_list* vals = new Expression_list(); | |
f8bdf81a | 1233 | vals->push_back(Expression::make_func_code_reference(this->fn_, bloc)); |
8381eda7 | 1234 | Expression* init = |
1235 | Expression::make_struct_composite_literal(this->type(), vals, bloc); | |
1236 | Translate_context bcontext(gogo, NULL, NULL, NULL); | |
1237 | bcontext.set_is_const(); | |
ea664253 | 1238 | Bexpression* binit = init->get_backend(&bcontext); |
8381eda7 | 1239 | context->backend()->immutable_struct_set_init(bvar, var_name, is_hidden, |
1240 | false, btype, bloc, binit); | |
1241 | } | |
1242 | ||
1243 | this->dvar_ = bvar; | |
ea664253 | 1244 | return gogo->backend()->var_expression(bvar, loc); |
8381eda7 | 1245 | } |
1246 | ||
c6837989 | 1247 | // Print a function descriptor expression. |
1248 | ||
1249 | void | |
1250 | Func_descriptor_expression::do_dump_expression(Ast_dump_context* context) const | |
1251 | { | |
1252 | context->ostream() << "[descriptor " << this->fn_->name() << "]"; | |
1253 | } | |
1254 | ||
8381eda7 | 1255 | // Make a function descriptor expression. |
1256 | ||
c6837989 | 1257 | Func_descriptor_expression* |
1258 | Expression::make_func_descriptor(Named_object* fn) | |
8381eda7 | 1259 | { |
c6837989 | 1260 | return new Func_descriptor_expression(fn); |
8381eda7 | 1261 | } |
1262 | ||
1263 | // Make the function descriptor type, so that it can be converted. | |
1264 | ||
1265 | void | |
1266 | Expression::make_func_descriptor_type() | |
1267 | { | |
1268 | Func_descriptor_expression::make_func_descriptor_type(); | |
1269 | } | |
1270 | ||
1271 | // A reference to just the code of a function. | |
1272 | ||
1273 | class Func_code_reference_expression : public Expression | |
1274 | { | |
1275 | public: | |
1276 | Func_code_reference_expression(Named_object* function, Location location) | |
1277 | : Expression(EXPRESSION_FUNC_CODE_REFERENCE, location), | |
1278 | function_(function) | |
1279 | { } | |
1280 | ||
1281 | protected: | |
1282 | int | |
1283 | do_traverse(Traverse*) | |
1284 | { return TRAVERSE_CONTINUE; } | |
1285 | ||
f9ca30f9 | 1286 | bool |
1287 | do_is_immutable() const | |
1288 | { return true; } | |
1289 | ||
8381eda7 | 1290 | Type* |
1291 | do_type() | |
1292 | { return Type::make_pointer_type(Type::make_void_type()); } | |
1293 | ||
1294 | void | |
1295 | do_determine_type(const Type_context*) | |
1296 | { } | |
1297 | ||
1298 | Expression* | |
1299 | do_copy() | |
1300 | { | |
1301 | return Expression::make_func_code_reference(this->function_, | |
1302 | this->location()); | |
1303 | } | |
1304 | ||
ea664253 | 1305 | Bexpression* |
1306 | do_get_backend(Translate_context*); | |
8381eda7 | 1307 | |
1308 | void | |
1309 | do_dump_expression(Ast_dump_context* context) const | |
1310 | { context->ostream() << "[raw " << this->function_->name() << "]" ; } | |
1311 | ||
1312 | private: | |
1313 | // The function. | |
1314 | Named_object* function_; | |
1315 | }; | |
1316 | ||
ea664253 | 1317 | // Get the backend representation for a reference to function code. |
8381eda7 | 1318 | |
ea664253 | 1319 | Bexpression* |
1320 | Func_code_reference_expression::do_get_backend(Translate_context* context) | |
8381eda7 | 1321 | { |
ea664253 | 1322 | return Func_expression::get_code_pointer(context->gogo(), this->function_, |
1323 | this->location()); | |
8381eda7 | 1324 | } |
1325 | ||
1326 | // Make a reference to the code of a function. | |
1327 | ||
1328 | Expression* | |
1329 | Expression::make_func_code_reference(Named_object* function, Location location) | |
1330 | { | |
1331 | return new Func_code_reference_expression(function, location); | |
1332 | } | |
1333 | ||
e440a328 | 1334 | // Class Unknown_expression. |
1335 | ||
1336 | // Return the name of an unknown expression. | |
1337 | ||
1338 | const std::string& | |
1339 | Unknown_expression::name() const | |
1340 | { | |
1341 | return this->named_object_->name(); | |
1342 | } | |
1343 | ||
1344 | // Lower a reference to an unknown name. | |
1345 | ||
1346 | Expression* | |
ceeb4318 | 1347 | Unknown_expression::do_lower(Gogo*, Named_object*, Statement_inserter*, int) |
e440a328 | 1348 | { |
b13c66cd | 1349 | Location location = this->location(); |
e440a328 | 1350 | Named_object* no = this->named_object_; |
deded542 | 1351 | Named_object* real; |
1352 | if (!no->is_unknown()) | |
1353 | real = no; | |
1354 | else | |
e440a328 | 1355 | { |
deded542 | 1356 | real = no->unknown_value()->real_named_object(); |
1357 | if (real == NULL) | |
1358 | { | |
1359 | if (this->is_composite_literal_key_) | |
1360 | return this; | |
acf8e158 | 1361 | if (!this->no_error_message_) |
1362 | error_at(location, "reference to undefined name %qs", | |
1363 | this->named_object_->message_name().c_str()); | |
deded542 | 1364 | return Expression::make_error(location); |
1365 | } | |
e440a328 | 1366 | } |
1367 | switch (real->classification()) | |
1368 | { | |
1369 | case Named_object::NAMED_OBJECT_CONST: | |
1370 | return Expression::make_const_reference(real, location); | |
1371 | case Named_object::NAMED_OBJECT_TYPE: | |
1372 | return Expression::make_type(real->type_value(), location); | |
1373 | case Named_object::NAMED_OBJECT_TYPE_DECLARATION: | |
1374 | if (this->is_composite_literal_key_) | |
1375 | return this; | |
acf8e158 | 1376 | if (!this->no_error_message_) |
1377 | error_at(location, "reference to undefined type %qs", | |
1378 | real->message_name().c_str()); | |
e440a328 | 1379 | return Expression::make_error(location); |
1380 | case Named_object::NAMED_OBJECT_VAR: | |
7d834090 | 1381 | real->var_value()->set_is_used(); |
e440a328 | 1382 | return Expression::make_var_reference(real, location); |
1383 | case Named_object::NAMED_OBJECT_FUNC: | |
1384 | case Named_object::NAMED_OBJECT_FUNC_DECLARATION: | |
1385 | return Expression::make_func_reference(real, NULL, location); | |
1386 | case Named_object::NAMED_OBJECT_PACKAGE: | |
1387 | if (this->is_composite_literal_key_) | |
1388 | return this; | |
acf8e158 | 1389 | if (!this->no_error_message_) |
1390 | error_at(location, "unexpected reference to package"); | |
e440a328 | 1391 | return Expression::make_error(location); |
1392 | default: | |
c3e6f413 | 1393 | go_unreachable(); |
e440a328 | 1394 | } |
1395 | } | |
1396 | ||
d751bb78 | 1397 | // Dump the ast representation for an unknown expression to a dump context. |
1398 | ||
1399 | void | |
1400 | Unknown_expression::do_dump_expression(Ast_dump_context* ast_dump_context) const | |
1401 | { | |
1402 | ast_dump_context->ostream() << "_Unknown_(" << this->named_object_->name() | |
1403 | << ")"; | |
d751bb78 | 1404 | } |
1405 | ||
e440a328 | 1406 | // Make a reference to an unknown name. |
1407 | ||
acf8e158 | 1408 | Unknown_expression* |
b13c66cd | 1409 | Expression::make_unknown_reference(Named_object* no, Location location) |
e440a328 | 1410 | { |
e440a328 | 1411 | return new Unknown_expression(no, location); |
1412 | } | |
1413 | ||
1414 | // A boolean expression. | |
1415 | ||
1416 | class Boolean_expression : public Expression | |
1417 | { | |
1418 | public: | |
b13c66cd | 1419 | Boolean_expression(bool val, Location location) |
e440a328 | 1420 | : Expression(EXPRESSION_BOOLEAN, location), |
1421 | val_(val), type_(NULL) | |
1422 | { } | |
1423 | ||
1424 | static Expression* | |
1425 | do_import(Import*); | |
1426 | ||
1427 | protected: | |
1428 | bool | |
1429 | do_is_constant() const | |
1430 | { return true; } | |
1431 | ||
0e168074 | 1432 | bool |
1433 | do_is_immutable() const | |
1434 | { return true; } | |
1435 | ||
e440a328 | 1436 | Type* |
1437 | do_type(); | |
1438 | ||
1439 | void | |
1440 | do_determine_type(const Type_context*); | |
1441 | ||
1442 | Expression* | |
1443 | do_copy() | |
1444 | { return this; } | |
1445 | ||
ea664253 | 1446 | Bexpression* |
1447 | do_get_backend(Translate_context* context) | |
1448 | { return context->backend()->boolean_constant_expression(this->val_); } | |
e440a328 | 1449 | |
1450 | void | |
1451 | do_export(Export* exp) const | |
1452 | { exp->write_c_string(this->val_ ? "true" : "false"); } | |
1453 | ||
d751bb78 | 1454 | void |
1455 | do_dump_expression(Ast_dump_context* ast_dump_context) const | |
1456 | { ast_dump_context->ostream() << (this->val_ ? "true" : "false"); } | |
1457 | ||
e440a328 | 1458 | private: |
1459 | // The constant. | |
1460 | bool val_; | |
1461 | // The type as determined by context. | |
1462 | Type* type_; | |
1463 | }; | |
1464 | ||
1465 | // Get the type. | |
1466 | ||
1467 | Type* | |
1468 | Boolean_expression::do_type() | |
1469 | { | |
1470 | if (this->type_ == NULL) | |
1471 | this->type_ = Type::make_boolean_type(); | |
1472 | return this->type_; | |
1473 | } | |
1474 | ||
1475 | // Set the type from the context. | |
1476 | ||
1477 | void | |
1478 | Boolean_expression::do_determine_type(const Type_context* context) | |
1479 | { | |
1480 | if (this->type_ != NULL && !this->type_->is_abstract()) | |
1481 | ; | |
1482 | else if (context->type != NULL && context->type->is_boolean_type()) | |
1483 | this->type_ = context->type; | |
1484 | else if (!context->may_be_abstract) | |
1485 | this->type_ = Type::lookup_bool_type(); | |
1486 | } | |
1487 | ||
1488 | // Import a boolean constant. | |
1489 | ||
1490 | Expression* | |
1491 | Boolean_expression::do_import(Import* imp) | |
1492 | { | |
1493 | if (imp->peek_char() == 't') | |
1494 | { | |
1495 | imp->require_c_string("true"); | |
1496 | return Expression::make_boolean(true, imp->location()); | |
1497 | } | |
1498 | else | |
1499 | { | |
1500 | imp->require_c_string("false"); | |
1501 | return Expression::make_boolean(false, imp->location()); | |
1502 | } | |
1503 | } | |
1504 | ||
1505 | // Make a boolean expression. | |
1506 | ||
1507 | Expression* | |
b13c66cd | 1508 | Expression::make_boolean(bool val, Location location) |
e440a328 | 1509 | { |
1510 | return new Boolean_expression(val, location); | |
1511 | } | |
1512 | ||
1513 | // Class String_expression. | |
1514 | ||
1515 | // Get the type. | |
1516 | ||
1517 | Type* | |
1518 | String_expression::do_type() | |
1519 | { | |
1520 | if (this->type_ == NULL) | |
1521 | this->type_ = Type::make_string_type(); | |
1522 | return this->type_; | |
1523 | } | |
1524 | ||
1525 | // Set the type from the context. | |
1526 | ||
1527 | void | |
1528 | String_expression::do_determine_type(const Type_context* context) | |
1529 | { | |
1530 | if (this->type_ != NULL && !this->type_->is_abstract()) | |
1531 | ; | |
1532 | else if (context->type != NULL && context->type->is_string_type()) | |
1533 | this->type_ = context->type; | |
1534 | else if (!context->may_be_abstract) | |
1535 | this->type_ = Type::lookup_string_type(); | |
1536 | } | |
1537 | ||
1538 | // Build a string constant. | |
1539 | ||
ea664253 | 1540 | Bexpression* |
1541 | String_expression::do_get_backend(Translate_context* context) | |
e440a328 | 1542 | { |
2c809f8f | 1543 | Gogo* gogo = context->gogo(); |
1544 | Btype* btype = Type::make_string_type()->get_backend(gogo); | |
1545 | ||
1546 | Location loc = this->location(); | |
1547 | std::vector<Bexpression*> init(2); | |
1548 | Bexpression* str_cst = | |
1549 | gogo->backend()->string_constant_expression(this->val_); | |
1550 | init[0] = gogo->backend()->address_expression(str_cst, loc); | |
1551 | ||
1552 | Btype* int_btype = Type::lookup_integer_type("int")->get_backend(gogo); | |
1553 | mpz_t lenval; | |
1554 | mpz_init_set_ui(lenval, this->val_.length()); | |
1555 | init[1] = gogo->backend()->integer_constant_expression(int_btype, lenval); | |
1556 | mpz_clear(lenval); | |
1557 | ||
ea664253 | 1558 | return gogo->backend()->constructor_expression(btype, init, loc); |
e440a328 | 1559 | } |
1560 | ||
8b1c301d | 1561 | // Write string literal to string dump. |
e440a328 | 1562 | |
1563 | void | |
8b1c301d | 1564 | String_expression::export_string(String_dump* exp, |
1565 | const String_expression* str) | |
e440a328 | 1566 | { |
1567 | std::string s; | |
8b1c301d | 1568 | s.reserve(str->val_.length() * 4 + 2); |
e440a328 | 1569 | s += '"'; |
8b1c301d | 1570 | for (std::string::const_iterator p = str->val_.begin(); |
1571 | p != str->val_.end(); | |
e440a328 | 1572 | ++p) |
1573 | { | |
1574 | if (*p == '\\' || *p == '"') | |
1575 | { | |
1576 | s += '\\'; | |
1577 | s += *p; | |
1578 | } | |
1579 | else if (*p >= 0x20 && *p < 0x7f) | |
1580 | s += *p; | |
1581 | else if (*p == '\n') | |
1582 | s += "\\n"; | |
1583 | else if (*p == '\t') | |
1584 | s += "\\t"; | |
1585 | else | |
1586 | { | |
1587 | s += "\\x"; | |
1588 | unsigned char c = *p; | |
1589 | unsigned int dig = c >> 4; | |
1590 | s += dig < 10 ? '0' + dig : 'A' + dig - 10; | |
1591 | dig = c & 0xf; | |
1592 | s += dig < 10 ? '0' + dig : 'A' + dig - 10; | |
1593 | } | |
1594 | } | |
1595 | s += '"'; | |
1596 | exp->write_string(s); | |
1597 | } | |
1598 | ||
8b1c301d | 1599 | // Export a string expression. |
1600 | ||
1601 | void | |
1602 | String_expression::do_export(Export* exp) const | |
1603 | { | |
1604 | String_expression::export_string(exp, this); | |
1605 | } | |
1606 | ||
e440a328 | 1607 | // Import a string expression. |
1608 | ||
1609 | Expression* | |
1610 | String_expression::do_import(Import* imp) | |
1611 | { | |
1612 | imp->require_c_string("\""); | |
1613 | std::string val; | |
1614 | while (true) | |
1615 | { | |
1616 | int c = imp->get_char(); | |
1617 | if (c == '"' || c == -1) | |
1618 | break; | |
1619 | if (c != '\\') | |
1620 | val += static_cast<char>(c); | |
1621 | else | |
1622 | { | |
1623 | c = imp->get_char(); | |
1624 | if (c == '\\' || c == '"') | |
1625 | val += static_cast<char>(c); | |
1626 | else if (c == 'n') | |
1627 | val += '\n'; | |
1628 | else if (c == 't') | |
1629 | val += '\t'; | |
1630 | else if (c == 'x') | |
1631 | { | |
1632 | c = imp->get_char(); | |
1633 | unsigned int vh = c >= '0' && c <= '9' ? c - '0' : c - 'A' + 10; | |
1634 | c = imp->get_char(); | |
1635 | unsigned int vl = c >= '0' && c <= '9' ? c - '0' : c - 'A' + 10; | |
1636 | char v = (vh << 4) | vl; | |
1637 | val += v; | |
1638 | } | |
1639 | else | |
1640 | { | |
1641 | error_at(imp->location(), "bad string constant"); | |
1642 | return Expression::make_error(imp->location()); | |
1643 | } | |
1644 | } | |
1645 | } | |
1646 | return Expression::make_string(val, imp->location()); | |
1647 | } | |
1648 | ||
d751bb78 | 1649 | // Ast dump for string expression. |
1650 | ||
1651 | void | |
1652 | String_expression::do_dump_expression(Ast_dump_context* ast_dump_context) const | |
1653 | { | |
8b1c301d | 1654 | String_expression::export_string(ast_dump_context, this); |
d751bb78 | 1655 | } |
1656 | ||
e440a328 | 1657 | // Make a string expression. |
1658 | ||
1659 | Expression* | |
b13c66cd | 1660 | Expression::make_string(const std::string& val, Location location) |
e440a328 | 1661 | { |
1662 | return new String_expression(val, location); | |
1663 | } | |
1664 | ||
2c809f8f | 1665 | // An expression that evaluates to some characteristic of a string. |
1666 | // This is used when indexing, bound-checking, or nil checking a string. | |
1667 | ||
1668 | class String_info_expression : public Expression | |
1669 | { | |
1670 | public: | |
1671 | String_info_expression(Expression* string, String_info string_info, | |
1672 | Location location) | |
1673 | : Expression(EXPRESSION_STRING_INFO, location), | |
1674 | string_(string), string_info_(string_info) | |
1675 | { } | |
1676 | ||
1677 | protected: | |
1678 | Type* | |
1679 | do_type(); | |
1680 | ||
1681 | void | |
1682 | do_determine_type(const Type_context*) | |
1683 | { go_unreachable(); } | |
1684 | ||
1685 | Expression* | |
1686 | do_copy() | |
1687 | { | |
1688 | return new String_info_expression(this->string_->copy(), this->string_info_, | |
1689 | this->location()); | |
1690 | } | |
1691 | ||
ea664253 | 1692 | Bexpression* |
1693 | do_get_backend(Translate_context* context); | |
2c809f8f | 1694 | |
1695 | void | |
1696 | do_dump_expression(Ast_dump_context*) const; | |
1697 | ||
1698 | void | |
1699 | do_issue_nil_check() | |
1700 | { this->string_->issue_nil_check(); } | |
1701 | ||
1702 | private: | |
1703 | // The string for which we are getting information. | |
1704 | Expression* string_; | |
1705 | // What information we want. | |
1706 | String_info string_info_; | |
1707 | }; | |
1708 | ||
1709 | // Return the type of the string info. | |
1710 | ||
1711 | Type* | |
1712 | String_info_expression::do_type() | |
1713 | { | |
1714 | switch (this->string_info_) | |
1715 | { | |
1716 | case STRING_INFO_DATA: | |
1717 | { | |
1718 | Type* byte_type = Type::lookup_integer_type("uint8"); | |
1719 | return Type::make_pointer_type(byte_type); | |
1720 | } | |
1721 | case STRING_INFO_LENGTH: | |
1722 | return Type::lookup_integer_type("int"); | |
1723 | default: | |
1724 | go_unreachable(); | |
1725 | } | |
1726 | } | |
1727 | ||
1728 | // Return string information in GENERIC. | |
1729 | ||
ea664253 | 1730 | Bexpression* |
1731 | String_info_expression::do_get_backend(Translate_context* context) | |
2c809f8f | 1732 | { |
1733 | Gogo* gogo = context->gogo(); | |
1734 | ||
ea664253 | 1735 | Bexpression* bstring = this->string_->get_backend(context); |
2c809f8f | 1736 | switch (this->string_info_) |
1737 | { | |
1738 | case STRING_INFO_DATA: | |
1739 | case STRING_INFO_LENGTH: | |
ea664253 | 1740 | return gogo->backend()->struct_field_expression(bstring, |
1741 | this->string_info_, | |
1742 | this->location()); | |
2c809f8f | 1743 | break; |
1744 | default: | |
1745 | go_unreachable(); | |
1746 | } | |
2c809f8f | 1747 | } |
1748 | ||
1749 | // Dump ast representation for a type info expression. | |
1750 | ||
1751 | void | |
1752 | String_info_expression::do_dump_expression( | |
1753 | Ast_dump_context* ast_dump_context) const | |
1754 | { | |
1755 | ast_dump_context->ostream() << "stringinfo("; | |
1756 | this->string_->dump_expression(ast_dump_context); | |
1757 | ast_dump_context->ostream() << ","; | |
1758 | ast_dump_context->ostream() << | |
1759 | (this->string_info_ == STRING_INFO_DATA ? "data" | |
1760 | : this->string_info_ == STRING_INFO_LENGTH ? "length" | |
1761 | : "unknown"); | |
1762 | ast_dump_context->ostream() << ")"; | |
1763 | } | |
1764 | ||
1765 | // Make a string info expression. | |
1766 | ||
1767 | Expression* | |
1768 | Expression::make_string_info(Expression* string, String_info string_info, | |
1769 | Location location) | |
1770 | { | |
1771 | return new String_info_expression(string, string_info, location); | |
1772 | } | |
1773 | ||
e440a328 | 1774 | // Make an integer expression. |
1775 | ||
1776 | class Integer_expression : public Expression | |
1777 | { | |
1778 | public: | |
5d4b8566 | 1779 | Integer_expression(const mpz_t* val, Type* type, bool is_character_constant, |
1780 | Location location) | |
e440a328 | 1781 | : Expression(EXPRESSION_INTEGER, location), |
5d4b8566 | 1782 | type_(type), is_character_constant_(is_character_constant) |
e440a328 | 1783 | { mpz_init_set(this->val_, *val); } |
1784 | ||
1785 | static Expression* | |
1786 | do_import(Import*); | |
1787 | ||
8b1c301d | 1788 | // Write VAL to string dump. |
e440a328 | 1789 | static void |
8b1c301d | 1790 | export_integer(String_dump* exp, const mpz_t val); |
e440a328 | 1791 | |
d751bb78 | 1792 | // Write VAL to dump context. |
1793 | static void | |
1794 | dump_integer(Ast_dump_context* ast_dump_context, const mpz_t val); | |
1795 | ||
e440a328 | 1796 | protected: |
1797 | bool | |
1798 | do_is_constant() const | |
1799 | { return true; } | |
1800 | ||
0e168074 | 1801 | bool |
1802 | do_is_immutable() const | |
1803 | { return true; } | |
1804 | ||
e440a328 | 1805 | bool |
0c77715b | 1806 | do_numeric_constant_value(Numeric_constant* nc) const; |
e440a328 | 1807 | |
1808 | Type* | |
1809 | do_type(); | |
1810 | ||
1811 | void | |
1812 | do_determine_type(const Type_context* context); | |
1813 | ||
1814 | void | |
1815 | do_check_types(Gogo*); | |
1816 | ||
ea664253 | 1817 | Bexpression* |
1818 | do_get_backend(Translate_context*); | |
e440a328 | 1819 | |
1820 | Expression* | |
1821 | do_copy() | |
5d4b8566 | 1822 | { |
1823 | if (this->is_character_constant_) | |
1824 | return Expression::make_character(&this->val_, this->type_, | |
1825 | this->location()); | |
1826 | else | |
e67508fa | 1827 | return Expression::make_integer_z(&this->val_, this->type_, |
1828 | this->location()); | |
5d4b8566 | 1829 | } |
e440a328 | 1830 | |
1831 | void | |
1832 | do_export(Export*) const; | |
1833 | ||
d751bb78 | 1834 | void |
1835 | do_dump_expression(Ast_dump_context*) const; | |
1836 | ||
e440a328 | 1837 | private: |
1838 | // The integer value. | |
1839 | mpz_t val_; | |
1840 | // The type so far. | |
1841 | Type* type_; | |
5d4b8566 | 1842 | // Whether this is a character constant. |
1843 | bool is_character_constant_; | |
e440a328 | 1844 | }; |
1845 | ||
0c77715b | 1846 | // Return a numeric constant for this expression. We have to mark |
1847 | // this as a character when appropriate. | |
e440a328 | 1848 | |
1849 | bool | |
0c77715b | 1850 | Integer_expression::do_numeric_constant_value(Numeric_constant* nc) const |
e440a328 | 1851 | { |
0c77715b | 1852 | if (this->is_character_constant_) |
1853 | nc->set_rune(this->type_, this->val_); | |
1854 | else | |
1855 | nc->set_int(this->type_, this->val_); | |
e440a328 | 1856 | return true; |
1857 | } | |
1858 | ||
1859 | // Return the current type. If we haven't set the type yet, we return | |
1860 | // an abstract integer type. | |
1861 | ||
1862 | Type* | |
1863 | Integer_expression::do_type() | |
1864 | { | |
1865 | if (this->type_ == NULL) | |
5d4b8566 | 1866 | { |
1867 | if (this->is_character_constant_) | |
1868 | this->type_ = Type::make_abstract_character_type(); | |
1869 | else | |
1870 | this->type_ = Type::make_abstract_integer_type(); | |
1871 | } | |
e440a328 | 1872 | return this->type_; |
1873 | } | |
1874 | ||
1875 | // Set the type of the integer value. Here we may switch from an | |
1876 | // abstract type to a real type. | |
1877 | ||
1878 | void | |
1879 | Integer_expression::do_determine_type(const Type_context* context) | |
1880 | { | |
1881 | if (this->type_ != NULL && !this->type_->is_abstract()) | |
1882 | ; | |
0c77715b | 1883 | else if (context->type != NULL && context->type->is_numeric_type()) |
e440a328 | 1884 | this->type_ = context->type; |
1885 | else if (!context->may_be_abstract) | |
5d4b8566 | 1886 | { |
1887 | if (this->is_character_constant_) | |
1888 | this->type_ = Type::lookup_integer_type("int32"); | |
1889 | else | |
1890 | this->type_ = Type::lookup_integer_type("int"); | |
1891 | } | |
e440a328 | 1892 | } |
1893 | ||
e440a328 | 1894 | // Check the type of an integer constant. |
1895 | ||
1896 | void | |
1897 | Integer_expression::do_check_types(Gogo*) | |
1898 | { | |
0c77715b | 1899 | Type* type = this->type_; |
1900 | if (type == NULL) | |
e440a328 | 1901 | return; |
0c77715b | 1902 | Numeric_constant nc; |
1903 | if (this->is_character_constant_) | |
1904 | nc.set_rune(NULL, this->val_); | |
1905 | else | |
1906 | nc.set_int(NULL, this->val_); | |
1907 | if (!nc.set_type(type, true, this->location())) | |
e440a328 | 1908 | this->set_is_error(); |
1909 | } | |
1910 | ||
ea664253 | 1911 | // Get the backend representation for an integer constant. |
e440a328 | 1912 | |
ea664253 | 1913 | Bexpression* |
1914 | Integer_expression::do_get_backend(Translate_context* context) | |
e440a328 | 1915 | { |
48c2a53a | 1916 | Type* resolved_type = NULL; |
e440a328 | 1917 | if (this->type_ != NULL && !this->type_->is_abstract()) |
48c2a53a | 1918 | resolved_type = this->type_; |
e440a328 | 1919 | else if (this->type_ != NULL && this->type_->float_type() != NULL) |
1920 | { | |
1921 | // We are converting to an abstract floating point type. | |
48c2a53a | 1922 | resolved_type = Type::lookup_float_type("float64"); |
e440a328 | 1923 | } |
1924 | else if (this->type_ != NULL && this->type_->complex_type() != NULL) | |
1925 | { | |
1926 | // We are converting to an abstract complex type. | |
48c2a53a | 1927 | resolved_type = Type::lookup_complex_type("complex128"); |
e440a328 | 1928 | } |
1929 | else | |
1930 | { | |
1931 | // If we still have an abstract type here, then this is being | |
1932 | // used in a constant expression which didn't get reduced for | |
1933 | // some reason. Use a type which will fit the value. We use <, | |
1934 | // not <=, because we need an extra bit for the sign bit. | |
1935 | int bits = mpz_sizeinbase(this->val_, 2); | |
1b1f2abf | 1936 | Type* int_type = Type::lookup_integer_type("int"); |
1937 | if (bits < int_type->integer_type()->bits()) | |
48c2a53a | 1938 | resolved_type = int_type; |
e440a328 | 1939 | else if (bits < 64) |
48c2a53a | 1940 | resolved_type = Type::lookup_integer_type("int64"); |
e440a328 | 1941 | else |
48c2a53a | 1942 | { |
1943 | if (!saw_errors()) | |
1944 | error_at(this->location(), | |
1945 | "unknown type for large integer constant"); | |
ea664253 | 1946 | return context->gogo()->backend()->error_expression(); |
48c2a53a | 1947 | } |
e440a328 | 1948 | } |
48c2a53a | 1949 | Numeric_constant nc; |
1950 | nc.set_int(resolved_type, this->val_); | |
ea664253 | 1951 | return Expression::backend_numeric_constant_expression(context, &nc); |
e440a328 | 1952 | } |
1953 | ||
1954 | // Write VAL to export data. | |
1955 | ||
1956 | void | |
8b1c301d | 1957 | Integer_expression::export_integer(String_dump* exp, const mpz_t val) |
e440a328 | 1958 | { |
1959 | char* s = mpz_get_str(NULL, 10, val); | |
1960 | exp->write_c_string(s); | |
1961 | free(s); | |
1962 | } | |
1963 | ||
1964 | // Export an integer in a constant expression. | |
1965 | ||
1966 | void | |
1967 | Integer_expression::do_export(Export* exp) const | |
1968 | { | |
1969 | Integer_expression::export_integer(exp, this->val_); | |
5d4b8566 | 1970 | if (this->is_character_constant_) |
1971 | exp->write_c_string("'"); | |
e440a328 | 1972 | // A trailing space lets us reliably identify the end of the number. |
1973 | exp->write_c_string(" "); | |
1974 | } | |
1975 | ||
1976 | // Import an integer, floating point, or complex value. This handles | |
1977 | // all these types because they all start with digits. | |
1978 | ||
1979 | Expression* | |
1980 | Integer_expression::do_import(Import* imp) | |
1981 | { | |
1982 | std::string num = imp->read_identifier(); | |
1983 | imp->require_c_string(" "); | |
1984 | if (!num.empty() && num[num.length() - 1] == 'i') | |
1985 | { | |
1986 | mpfr_t real; | |
1987 | size_t plus_pos = num.find('+', 1); | |
1988 | size_t minus_pos = num.find('-', 1); | |
1989 | size_t pos; | |
1990 | if (plus_pos == std::string::npos) | |
1991 | pos = minus_pos; | |
1992 | else if (minus_pos == std::string::npos) | |
1993 | pos = plus_pos; | |
1994 | else | |
1995 | { | |
1996 | error_at(imp->location(), "bad number in import data: %qs", | |
1997 | num.c_str()); | |
1998 | return Expression::make_error(imp->location()); | |
1999 | } | |
2000 | if (pos == std::string::npos) | |
2001 | mpfr_set_ui(real, 0, GMP_RNDN); | |
2002 | else | |
2003 | { | |
2004 | std::string real_str = num.substr(0, pos); | |
2005 | if (mpfr_init_set_str(real, real_str.c_str(), 10, GMP_RNDN) != 0) | |
2006 | { | |
2007 | error_at(imp->location(), "bad number in import data: %qs", | |
2008 | real_str.c_str()); | |
2009 | return Expression::make_error(imp->location()); | |
2010 | } | |
2011 | } | |
2012 | ||
2013 | std::string imag_str; | |
2014 | if (pos == std::string::npos) | |
2015 | imag_str = num; | |
2016 | else | |
2017 | imag_str = num.substr(pos); | |
2018 | imag_str = imag_str.substr(0, imag_str.size() - 1); | |
2019 | mpfr_t imag; | |
2020 | if (mpfr_init_set_str(imag, imag_str.c_str(), 10, GMP_RNDN) != 0) | |
2021 | { | |
2022 | error_at(imp->location(), "bad number in import data: %qs", | |
2023 | imag_str.c_str()); | |
2024 | return Expression::make_error(imp->location()); | |
2025 | } | |
fcbea5e4 | 2026 | mpc_t cval; |
2027 | mpc_init2(cval, mpc_precision); | |
2028 | mpc_set_fr_fr(cval, real, imag, MPC_RNDNN); | |
e440a328 | 2029 | mpfr_clear(real); |
2030 | mpfr_clear(imag); | |
fcbea5e4 | 2031 | Expression* ret = Expression::make_complex(&cval, NULL, imp->location()); |
2032 | mpc_clear(cval); | |
e440a328 | 2033 | return ret; |
2034 | } | |
2035 | else if (num.find('.') == std::string::npos | |
2036 | && num.find('E') == std::string::npos) | |
2037 | { | |
5d4b8566 | 2038 | bool is_character_constant = (!num.empty() |
2039 | && num[num.length() - 1] == '\''); | |
2040 | if (is_character_constant) | |
2041 | num = num.substr(0, num.length() - 1); | |
e440a328 | 2042 | mpz_t val; |
2043 | if (mpz_init_set_str(val, num.c_str(), 10) != 0) | |
2044 | { | |
2045 | error_at(imp->location(), "bad number in import data: %qs", | |
2046 | num.c_str()); | |
2047 | return Expression::make_error(imp->location()); | |
2048 | } | |
5d4b8566 | 2049 | Expression* ret; |
2050 | if (is_character_constant) | |
2051 | ret = Expression::make_character(&val, NULL, imp->location()); | |
2052 | else | |
e67508fa | 2053 | ret = Expression::make_integer_z(&val, NULL, imp->location()); |
e440a328 | 2054 | mpz_clear(val); |
2055 | return ret; | |
2056 | } | |
2057 | else | |
2058 | { | |
2059 | mpfr_t val; | |
2060 | if (mpfr_init_set_str(val, num.c_str(), 10, GMP_RNDN) != 0) | |
2061 | { | |
2062 | error_at(imp->location(), "bad number in import data: %qs", | |
2063 | num.c_str()); | |
2064 | return Expression::make_error(imp->location()); | |
2065 | } | |
2066 | Expression* ret = Expression::make_float(&val, NULL, imp->location()); | |
2067 | mpfr_clear(val); | |
2068 | return ret; | |
2069 | } | |
2070 | } | |
d751bb78 | 2071 | // Ast dump for integer expression. |
2072 | ||
2073 | void | |
2074 | Integer_expression::do_dump_expression(Ast_dump_context* ast_dump_context) const | |
2075 | { | |
5d4b8566 | 2076 | if (this->is_character_constant_) |
2077 | ast_dump_context->ostream() << '\''; | |
8b1c301d | 2078 | Integer_expression::export_integer(ast_dump_context, this->val_); |
5d4b8566 | 2079 | if (this->is_character_constant_) |
2080 | ast_dump_context->ostream() << '\''; | |
d751bb78 | 2081 | } |
2082 | ||
e67508fa | 2083 | // Build a new integer value from a multi-precision integer. |
e440a328 | 2084 | |
2085 | Expression* | |
e67508fa | 2086 | Expression::make_integer_z(const mpz_t* val, Type* type, Location location) |
5d4b8566 | 2087 | { |
2088 | return new Integer_expression(val, type, false, location); | |
2089 | } | |
2090 | ||
e67508fa | 2091 | // Build a new integer value from an unsigned long. |
2092 | ||
2093 | Expression* | |
2094 | Expression::make_integer_ul(unsigned long val, Type *type, Location location) | |
2095 | { | |
2096 | mpz_t zval; | |
2097 | mpz_init_set_ui(zval, val); | |
2098 | Expression* ret = Expression::make_integer_z(&zval, type, location); | |
2099 | mpz_clear(zval); | |
2100 | return ret; | |
2101 | } | |
2102 | ||
2103 | // Build a new integer value from a signed long. | |
2104 | ||
2105 | Expression* | |
2106 | Expression::make_integer_sl(long val, Type *type, Location location) | |
2107 | { | |
2108 | mpz_t zval; | |
2109 | mpz_init_set_si(zval, val); | |
2110 | Expression* ret = Expression::make_integer_z(&zval, type, location); | |
2111 | mpz_clear(zval); | |
2112 | return ret; | |
2113 | } | |
2114 | ||
5d4b8566 | 2115 | // Build a new character constant value. |
2116 | ||
2117 | Expression* | |
2118 | Expression::make_character(const mpz_t* val, Type* type, Location location) | |
e440a328 | 2119 | { |
5d4b8566 | 2120 | return new Integer_expression(val, type, true, location); |
e440a328 | 2121 | } |
2122 | ||
2123 | // Floats. | |
2124 | ||
2125 | class Float_expression : public Expression | |
2126 | { | |
2127 | public: | |
b13c66cd | 2128 | Float_expression(const mpfr_t* val, Type* type, Location location) |
e440a328 | 2129 | : Expression(EXPRESSION_FLOAT, location), |
2130 | type_(type) | |
2131 | { | |
2132 | mpfr_init_set(this->val_, *val, GMP_RNDN); | |
2133 | } | |
2134 | ||
e440a328 | 2135 | // Write VAL to export data. |
2136 | static void | |
8b1c301d | 2137 | export_float(String_dump* exp, const mpfr_t val); |
2138 | ||
d751bb78 | 2139 | // Write VAL to dump file. |
2140 | static void | |
2141 | dump_float(Ast_dump_context* ast_dump_context, const mpfr_t val); | |
e440a328 | 2142 | |
2143 | protected: | |
2144 | bool | |
2145 | do_is_constant() const | |
2146 | { return true; } | |
2147 | ||
0e168074 | 2148 | bool |
2149 | do_is_immutable() const | |
2150 | { return true; } | |
2151 | ||
e440a328 | 2152 | bool |
0c77715b | 2153 | do_numeric_constant_value(Numeric_constant* nc) const |
2154 | { | |
2155 | nc->set_float(this->type_, this->val_); | |
2156 | return true; | |
2157 | } | |
e440a328 | 2158 | |
2159 | Type* | |
2160 | do_type(); | |
2161 | ||
2162 | void | |
2163 | do_determine_type(const Type_context*); | |
2164 | ||
2165 | void | |
2166 | do_check_types(Gogo*); | |
2167 | ||
2168 | Expression* | |
2169 | do_copy() | |
2170 | { return Expression::make_float(&this->val_, this->type_, | |
2171 | this->location()); } | |
2172 | ||
ea664253 | 2173 | Bexpression* |
2174 | do_get_backend(Translate_context*); | |
e440a328 | 2175 | |
2176 | void | |
2177 | do_export(Export*) const; | |
2178 | ||
d751bb78 | 2179 | void |
2180 | do_dump_expression(Ast_dump_context*) const; | |
2181 | ||
e440a328 | 2182 | private: |
2183 | // The floating point value. | |
2184 | mpfr_t val_; | |
2185 | // The type so far. | |
2186 | Type* type_; | |
2187 | }; | |
2188 | ||
e440a328 | 2189 | // Return the current type. If we haven't set the type yet, we return |
2190 | // an abstract float type. | |
2191 | ||
2192 | Type* | |
2193 | Float_expression::do_type() | |
2194 | { | |
2195 | if (this->type_ == NULL) | |
2196 | this->type_ = Type::make_abstract_float_type(); | |
2197 | return this->type_; | |
2198 | } | |
2199 | ||
2200 | // Set the type of the float value. Here we may switch from an | |
2201 | // abstract type to a real type. | |
2202 | ||
2203 | void | |
2204 | Float_expression::do_determine_type(const Type_context* context) | |
2205 | { | |
2206 | if (this->type_ != NULL && !this->type_->is_abstract()) | |
2207 | ; | |
2208 | else if (context->type != NULL | |
2209 | && (context->type->integer_type() != NULL | |
2210 | || context->type->float_type() != NULL | |
2211 | || context->type->complex_type() != NULL)) | |
2212 | this->type_ = context->type; | |
2213 | else if (!context->may_be_abstract) | |
48080209 | 2214 | this->type_ = Type::lookup_float_type("float64"); |
e440a328 | 2215 | } |
2216 | ||
e440a328 | 2217 | // Check the type of a float value. |
2218 | ||
2219 | void | |
2220 | Float_expression::do_check_types(Gogo*) | |
2221 | { | |
0c77715b | 2222 | Type* type = this->type_; |
2223 | if (type == NULL) | |
e440a328 | 2224 | return; |
0c77715b | 2225 | Numeric_constant nc; |
2226 | nc.set_float(NULL, this->val_); | |
2227 | if (!nc.set_type(this->type_, true, this->location())) | |
e440a328 | 2228 | this->set_is_error(); |
e440a328 | 2229 | } |
2230 | ||
ea664253 | 2231 | // Get the backend representation for a float constant. |
e440a328 | 2232 | |
ea664253 | 2233 | Bexpression* |
2234 | Float_expression::do_get_backend(Translate_context* context) | |
e440a328 | 2235 | { |
48c2a53a | 2236 | Type* resolved_type; |
e440a328 | 2237 | if (this->type_ != NULL && !this->type_->is_abstract()) |
48c2a53a | 2238 | resolved_type = this->type_; |
e440a328 | 2239 | else if (this->type_ != NULL && this->type_->integer_type() != NULL) |
2240 | { | |
2241 | // We have an abstract integer type. We just hope for the best. | |
48c2a53a | 2242 | resolved_type = Type::lookup_integer_type("int"); |
2243 | } | |
2244 | else if (this->type_ != NULL && this->type_->complex_type() != NULL) | |
2245 | { | |
2246 | // We are converting to an abstract complex type. | |
2247 | resolved_type = Type::lookup_complex_type("complex128"); | |
e440a328 | 2248 | } |
2249 | else | |
2250 | { | |
2251 | // If we still have an abstract type here, then this is being | |
2252 | // used in a constant expression which didn't get reduced. We | |
2253 | // just use float64 and hope for the best. | |
48c2a53a | 2254 | resolved_type = Type::lookup_float_type("float64"); |
e440a328 | 2255 | } |
48c2a53a | 2256 | |
2257 | Numeric_constant nc; | |
2258 | nc.set_float(resolved_type, this->val_); | |
ea664253 | 2259 | return Expression::backend_numeric_constant_expression(context, &nc); |
e440a328 | 2260 | } |
2261 | ||
8b1c301d | 2262 | // Write a floating point number to a string dump. |
e440a328 | 2263 | |
2264 | void | |
8b1c301d | 2265 | Float_expression::export_float(String_dump *exp, const mpfr_t val) |
e440a328 | 2266 | { |
2267 | mp_exp_t exponent; | |
2268 | char* s = mpfr_get_str(NULL, &exponent, 10, 0, val, GMP_RNDN); | |
2269 | if (*s == '-') | |
2270 | exp->write_c_string("-"); | |
2271 | exp->write_c_string("0."); | |
2272 | exp->write_c_string(*s == '-' ? s + 1 : s); | |
2273 | mpfr_free_str(s); | |
2274 | char buf[30]; | |
2275 | snprintf(buf, sizeof buf, "E%ld", exponent); | |
2276 | exp->write_c_string(buf); | |
2277 | } | |
2278 | ||
2279 | // Export a floating point number in a constant expression. | |
2280 | ||
2281 | void | |
2282 | Float_expression::do_export(Export* exp) const | |
2283 | { | |
2284 | Float_expression::export_float(exp, this->val_); | |
2285 | // A trailing space lets us reliably identify the end of the number. | |
2286 | exp->write_c_string(" "); | |
2287 | } | |
2288 | ||
d751bb78 | 2289 | // Dump a floating point number to the dump file. |
2290 | ||
2291 | void | |
2292 | Float_expression::do_dump_expression(Ast_dump_context* ast_dump_context) const | |
2293 | { | |
8b1c301d | 2294 | Float_expression::export_float(ast_dump_context, this->val_); |
d751bb78 | 2295 | } |
2296 | ||
e440a328 | 2297 | // Make a float expression. |
2298 | ||
2299 | Expression* | |
b13c66cd | 2300 | Expression::make_float(const mpfr_t* val, Type* type, Location location) |
e440a328 | 2301 | { |
2302 | return new Float_expression(val, type, location); | |
2303 | } | |
2304 | ||
2305 | // Complex numbers. | |
2306 | ||
2307 | class Complex_expression : public Expression | |
2308 | { | |
2309 | public: | |
fcbea5e4 | 2310 | Complex_expression(const mpc_t* val, Type* type, Location location) |
e440a328 | 2311 | : Expression(EXPRESSION_COMPLEX, location), |
2312 | type_(type) | |
2313 | { | |
fcbea5e4 | 2314 | mpc_init2(this->val_, mpc_precision); |
2315 | mpc_set(this->val_, *val, MPC_RNDNN); | |
e440a328 | 2316 | } |
2317 | ||
fcbea5e4 | 2318 | // Write VAL to string dump. |
e440a328 | 2319 | static void |
fcbea5e4 | 2320 | export_complex(String_dump* exp, const mpc_t val); |
e440a328 | 2321 | |
d751bb78 | 2322 | // Write REAL/IMAG to dump context. |
2323 | static void | |
fcbea5e4 | 2324 | dump_complex(Ast_dump_context* ast_dump_context, const mpc_t val); |
d751bb78 | 2325 | |
e440a328 | 2326 | protected: |
2327 | bool | |
2328 | do_is_constant() const | |
2329 | { return true; } | |
2330 | ||
0e168074 | 2331 | bool |
2332 | do_is_immutable() const | |
2333 | { return true; } | |
2334 | ||
e440a328 | 2335 | bool |
0c77715b | 2336 | do_numeric_constant_value(Numeric_constant* nc) const |
2337 | { | |
fcbea5e4 | 2338 | nc->set_complex(this->type_, this->val_); |
0c77715b | 2339 | return true; |
2340 | } | |
e440a328 | 2341 | |
2342 | Type* | |
2343 | do_type(); | |
2344 | ||
2345 | void | |
2346 | do_determine_type(const Type_context*); | |
2347 | ||
2348 | void | |
2349 | do_check_types(Gogo*); | |
2350 | ||
2351 | Expression* | |
2352 | do_copy() | |
2353 | { | |
fcbea5e4 | 2354 | return Expression::make_complex(&this->val_, this->type_, |
e440a328 | 2355 | this->location()); |
2356 | } | |
2357 | ||
ea664253 | 2358 | Bexpression* |
2359 | do_get_backend(Translate_context*); | |
e440a328 | 2360 | |
2361 | void | |
2362 | do_export(Export*) const; | |
2363 | ||
d751bb78 | 2364 | void |
2365 | do_dump_expression(Ast_dump_context*) const; | |
2366 | ||
e440a328 | 2367 | private: |
fcbea5e4 | 2368 | // The complex value. |
2369 | mpc_t val_; | |
e440a328 | 2370 | // The type if known. |
2371 | Type* type_; | |
2372 | }; | |
2373 | ||
e440a328 | 2374 | // Return the current type. If we haven't set the type yet, we return |
2375 | // an abstract complex type. | |
2376 | ||
2377 | Type* | |
2378 | Complex_expression::do_type() | |
2379 | { | |
2380 | if (this->type_ == NULL) | |
2381 | this->type_ = Type::make_abstract_complex_type(); | |
2382 | return this->type_; | |
2383 | } | |
2384 | ||
2385 | // Set the type of the complex value. Here we may switch from an | |
2386 | // abstract type to a real type. | |
2387 | ||
2388 | void | |
2389 | Complex_expression::do_determine_type(const Type_context* context) | |
2390 | { | |
2391 | if (this->type_ != NULL && !this->type_->is_abstract()) | |
2392 | ; | |
2393 | else if (context->type != NULL | |
2394 | && context->type->complex_type() != NULL) | |
2395 | this->type_ = context->type; | |
2396 | else if (!context->may_be_abstract) | |
48080209 | 2397 | this->type_ = Type::lookup_complex_type("complex128"); |
e440a328 | 2398 | } |
2399 | ||
e440a328 | 2400 | // Check the type of a complex value. |
2401 | ||
2402 | void | |
2403 | Complex_expression::do_check_types(Gogo*) | |
2404 | { | |
0c77715b | 2405 | Type* type = this->type_; |
2406 | if (type == NULL) | |
e440a328 | 2407 | return; |
0c77715b | 2408 | Numeric_constant nc; |
fcbea5e4 | 2409 | nc.set_complex(NULL, this->val_); |
0c77715b | 2410 | if (!nc.set_type(this->type_, true, this->location())) |
e440a328 | 2411 | this->set_is_error(); |
2412 | } | |
2413 | ||
ea664253 | 2414 | // Get the backend representation for a complex constant. |
e440a328 | 2415 | |
ea664253 | 2416 | Bexpression* |
2417 | Complex_expression::do_get_backend(Translate_context* context) | |
e440a328 | 2418 | { |
48c2a53a | 2419 | Type* resolved_type; |
e440a328 | 2420 | if (this->type_ != NULL && !this->type_->is_abstract()) |
48c2a53a | 2421 | resolved_type = this->type_; |
2422 | else if (this->type_ != NULL && this->type_->integer_type() != NULL) | |
2423 | { | |
2424 | // We are converting to an abstract integer type. | |
2425 | resolved_type = Type::lookup_integer_type("int"); | |
2426 | } | |
2427 | else if (this->type_ != NULL && this->type_->float_type() != NULL) | |
2428 | { | |
2429 | // We are converting to an abstract float type. | |
2430 | resolved_type = Type::lookup_float_type("float64"); | |
2431 | } | |
e440a328 | 2432 | else |
2433 | { | |
2434 | // If we still have an abstract type here, this this is being | |
2435 | // used in a constant expression which didn't get reduced. We | |
2436 | // just use complex128 and hope for the best. | |
48c2a53a | 2437 | resolved_type = Type::lookup_complex_type("complex128"); |
e440a328 | 2438 | } |
48c2a53a | 2439 | |
2440 | Numeric_constant nc; | |
fcbea5e4 | 2441 | nc.set_complex(resolved_type, this->val_); |
ea664253 | 2442 | return Expression::backend_numeric_constant_expression(context, &nc); |
e440a328 | 2443 | } |
2444 | ||
2445 | // Write REAL/IMAG to export data. | |
2446 | ||
2447 | void | |
fcbea5e4 | 2448 | Complex_expression::export_complex(String_dump* exp, const mpc_t val) |
e440a328 | 2449 | { |
fcbea5e4 | 2450 | if (!mpfr_zero_p(mpc_realref(val))) |
e440a328 | 2451 | { |
fcbea5e4 | 2452 | Float_expression::export_float(exp, mpc_realref(val)); |
2453 | if (mpfr_sgn(mpc_imagref(val)) > 0) | |
e440a328 | 2454 | exp->write_c_string("+"); |
2455 | } | |
fcbea5e4 | 2456 | Float_expression::export_float(exp, mpc_imagref(val)); |
e440a328 | 2457 | exp->write_c_string("i"); |
2458 | } | |
2459 | ||
2460 | // Export a complex number in a constant expression. | |
2461 | ||
2462 | void | |
2463 | Complex_expression::do_export(Export* exp) const | |
2464 | { | |
fcbea5e4 | 2465 | Complex_expression::export_complex(exp, this->val_); |
e440a328 | 2466 | // A trailing space lets us reliably identify the end of the number. |
2467 | exp->write_c_string(" "); | |
2468 | } | |
2469 | ||
d751bb78 | 2470 | // Dump a complex expression to the dump file. |
2471 | ||
2472 | void | |
2473 | Complex_expression::do_dump_expression(Ast_dump_context* ast_dump_context) const | |
2474 | { | |
fcbea5e4 | 2475 | Complex_expression::export_complex(ast_dump_context, this->val_); |
d751bb78 | 2476 | } |
2477 | ||
e440a328 | 2478 | // Make a complex expression. |
2479 | ||
2480 | Expression* | |
fcbea5e4 | 2481 | Expression::make_complex(const mpc_t* val, Type* type, Location location) |
e440a328 | 2482 | { |
fcbea5e4 | 2483 | return new Complex_expression(val, type, location); |
e440a328 | 2484 | } |
2485 | ||
d5b605df | 2486 | // Find a named object in an expression. |
2487 | ||
2488 | class Find_named_object : public Traverse | |
2489 | { | |
2490 | public: | |
2491 | Find_named_object(Named_object* no) | |
2492 | : Traverse(traverse_expressions), | |
2493 | no_(no), found_(false) | |
2494 | { } | |
2495 | ||
2496 | // Whether we found the object. | |
2497 | bool | |
2498 | found() const | |
2499 | { return this->found_; } | |
2500 | ||
2501 | protected: | |
2502 | int | |
2503 | expression(Expression**); | |
2504 | ||
2505 | private: | |
2506 | // The object we are looking for. | |
2507 | Named_object* no_; | |
2508 | // Whether we found it. | |
2509 | bool found_; | |
2510 | }; | |
2511 | ||
e440a328 | 2512 | // A reference to a const in an expression. |
2513 | ||
2514 | class Const_expression : public Expression | |
2515 | { | |
2516 | public: | |
b13c66cd | 2517 | Const_expression(Named_object* constant, Location location) |
e440a328 | 2518 | : Expression(EXPRESSION_CONST_REFERENCE, location), |
13e818f5 | 2519 | constant_(constant), type_(NULL), seen_(false) |
e440a328 | 2520 | { } |
2521 | ||
d5b605df | 2522 | Named_object* |
2523 | named_object() | |
2524 | { return this->constant_; } | |
2525 | ||
a7f064d5 | 2526 | // Check that the initializer does not refer to the constant itself. |
2527 | void | |
2528 | check_for_init_loop(); | |
2529 | ||
e440a328 | 2530 | protected: |
ba4aedd4 | 2531 | int |
2532 | do_traverse(Traverse*); | |
2533 | ||
e440a328 | 2534 | Expression* |
ceeb4318 | 2535 | do_lower(Gogo*, Named_object*, Statement_inserter*, int); |
e440a328 | 2536 | |
2537 | bool | |
2538 | do_is_constant() const | |
2539 | { return true; } | |
2540 | ||
0e168074 | 2541 | bool |
2542 | do_is_immutable() const | |
2543 | { return true; } | |
2544 | ||
e440a328 | 2545 | bool |
0c77715b | 2546 | do_numeric_constant_value(Numeric_constant* nc) const; |
e440a328 | 2547 | |
2548 | bool | |
af6b489a | 2549 | do_string_constant_value(std::string* val) const; |
e440a328 | 2550 | |
2551 | Type* | |
2552 | do_type(); | |
2553 | ||
2554 | // The type of a const is set by the declaration, not the use. | |
2555 | void | |
2556 | do_determine_type(const Type_context*); | |
2557 | ||
2558 | void | |
2559 | do_check_types(Gogo*); | |
2560 | ||
2561 | Expression* | |
2562 | do_copy() | |
2563 | { return this; } | |
2564 | ||
ea664253 | 2565 | Bexpression* |
2566 | do_get_backend(Translate_context* context); | |
e440a328 | 2567 | |
2568 | // When exporting a reference to a const as part of a const | |
2569 | // expression, we export the value. We ignore the fact that it has | |
2570 | // a name. | |
2571 | void | |
2572 | do_export(Export* exp) const | |
2573 | { this->constant_->const_value()->expr()->export_expression(exp); } | |
2574 | ||
d751bb78 | 2575 | void |
2576 | do_dump_expression(Ast_dump_context*) const; | |
2577 | ||
e440a328 | 2578 | private: |
2579 | // The constant. | |
2580 | Named_object* constant_; | |
2581 | // The type of this reference. This is used if the constant has an | |
2582 | // abstract type. | |
2583 | Type* type_; | |
13e818f5 | 2584 | // Used to prevent infinite recursion when a constant incorrectly |
2585 | // refers to itself. | |
2586 | mutable bool seen_; | |
e440a328 | 2587 | }; |
2588 | ||
ba4aedd4 | 2589 | // Traversal. |
2590 | ||
2591 | int | |
2592 | Const_expression::do_traverse(Traverse* traverse) | |
2593 | { | |
2594 | if (this->type_ != NULL) | |
2595 | return Type::traverse(this->type_, traverse); | |
2596 | return TRAVERSE_CONTINUE; | |
2597 | } | |
2598 | ||
e440a328 | 2599 | // Lower a constant expression. This is where we convert the |
2600 | // predeclared constant iota into an integer value. | |
2601 | ||
2602 | Expression* | |
ceeb4318 | 2603 | Const_expression::do_lower(Gogo* gogo, Named_object*, |
2604 | Statement_inserter*, int iota_value) | |
e440a328 | 2605 | { |
2606 | if (this->constant_->const_value()->expr()->classification() | |
2607 | == EXPRESSION_IOTA) | |
2608 | { | |
2609 | if (iota_value == -1) | |
2610 | { | |
2611 | error_at(this->location(), | |
2612 | "iota is only defined in const declarations"); | |
2613 | iota_value = 0; | |
2614 | } | |
e67508fa | 2615 | return Expression::make_integer_ul(iota_value, NULL, this->location()); |
e440a328 | 2616 | } |
2617 | ||
2618 | // Make sure that the constant itself has been lowered. | |
2619 | gogo->lower_constant(this->constant_); | |
2620 | ||
2621 | return this; | |
2622 | } | |
2623 | ||
0c77715b | 2624 | // Return a numeric constant value. |
e440a328 | 2625 | |
2626 | bool | |
0c77715b | 2627 | Const_expression::do_numeric_constant_value(Numeric_constant* nc) const |
e440a328 | 2628 | { |
13e818f5 | 2629 | if (this->seen_) |
2630 | return false; | |
2631 | ||
e440a328 | 2632 | Expression* e = this->constant_->const_value()->expr(); |
0c77715b | 2633 | |
13e818f5 | 2634 | this->seen_ = true; |
2635 | ||
0c77715b | 2636 | bool r = e->numeric_constant_value(nc); |
e440a328 | 2637 | |
13e818f5 | 2638 | this->seen_ = false; |
2639 | ||
e440a328 | 2640 | Type* ctype; |
2641 | if (this->type_ != NULL) | |
2642 | ctype = this->type_; | |
2643 | else | |
2644 | ctype = this->constant_->const_value()->type(); | |
e440a328 | 2645 | if (r && ctype != NULL) |
2646 | { | |
0c77715b | 2647 | if (!nc->set_type(ctype, false, this->location())) |
e440a328 | 2648 | return false; |
e440a328 | 2649 | } |
e440a328 | 2650 | |
e440a328 | 2651 | return r; |
2652 | } | |
2653 | ||
af6b489a | 2654 | bool |
2655 | Const_expression::do_string_constant_value(std::string* val) const | |
2656 | { | |
2657 | if (this->seen_) | |
2658 | return false; | |
2659 | ||
2660 | Expression* e = this->constant_->const_value()->expr(); | |
2661 | ||
2662 | this->seen_ = true; | |
2663 | bool ok = e->string_constant_value(val); | |
2664 | this->seen_ = false; | |
2665 | ||
2666 | return ok; | |
2667 | } | |
2668 | ||
e440a328 | 2669 | // Return the type of the const reference. |
2670 | ||
2671 | Type* | |
2672 | Const_expression::do_type() | |
2673 | { | |
2674 | if (this->type_ != NULL) | |
2675 | return this->type_; | |
13e818f5 | 2676 | |
2f78f012 | 2677 | Named_constant* nc = this->constant_->const_value(); |
2678 | ||
2679 | if (this->seen_ || nc->lowering()) | |
13e818f5 | 2680 | { |
2681 | this->report_error(_("constant refers to itself")); | |
2682 | this->type_ = Type::make_error_type(); | |
2683 | return this->type_; | |
2684 | } | |
2685 | ||
2686 | this->seen_ = true; | |
2687 | ||
e440a328 | 2688 | Type* ret = nc->type(); |
13e818f5 | 2689 | |
e440a328 | 2690 | if (ret != NULL) |
13e818f5 | 2691 | { |
2692 | this->seen_ = false; | |
2693 | return ret; | |
2694 | } | |
2695 | ||
e440a328 | 2696 | // During parsing, a named constant may have a NULL type, but we |
2697 | // must not return a NULL type here. | |
13e818f5 | 2698 | ret = nc->expr()->type(); |
2699 | ||
2700 | this->seen_ = false; | |
2701 | ||
2702 | return ret; | |
e440a328 | 2703 | } |
2704 | ||
2705 | // Set the type of the const reference. | |
2706 | ||
2707 | void | |
2708 | Const_expression::do_determine_type(const Type_context* context) | |
2709 | { | |
2710 | Type* ctype = this->constant_->const_value()->type(); | |
2711 | Type* cetype = (ctype != NULL | |
2712 | ? ctype | |
2713 | : this->constant_->const_value()->expr()->type()); | |
2714 | if (ctype != NULL && !ctype->is_abstract()) | |
2715 | ; | |
2716 | else if (context->type != NULL | |
0c77715b | 2717 | && context->type->is_numeric_type() |
2718 | && cetype->is_numeric_type()) | |
e440a328 | 2719 | this->type_ = context->type; |
2720 | else if (context->type != NULL | |
2721 | && context->type->is_string_type() | |
2722 | && cetype->is_string_type()) | |
2723 | this->type_ = context->type; | |
2724 | else if (context->type != NULL | |
2725 | && context->type->is_boolean_type() | |
2726 | && cetype->is_boolean_type()) | |
2727 | this->type_ = context->type; | |
2728 | else if (!context->may_be_abstract) | |
2729 | { | |
2730 | if (cetype->is_abstract()) | |
2731 | cetype = cetype->make_non_abstract_type(); | |
2732 | this->type_ = cetype; | |
2733 | } | |
2734 | } | |
2735 | ||
a7f064d5 | 2736 | // Check for a loop in which the initializer of a constant refers to |
2737 | // the constant itself. | |
e440a328 | 2738 | |
2739 | void | |
a7f064d5 | 2740 | Const_expression::check_for_init_loop() |
e440a328 | 2741 | { |
5c13bd80 | 2742 | if (this->type_ != NULL && this->type_->is_error()) |
d5b605df | 2743 | return; |
2744 | ||
a7f064d5 | 2745 | if (this->seen_) |
2746 | { | |
2747 | this->report_error(_("constant refers to itself")); | |
2748 | this->type_ = Type::make_error_type(); | |
2749 | return; | |
2750 | } | |
2751 | ||
d5b605df | 2752 | Expression* init = this->constant_->const_value()->expr(); |
2753 | Find_named_object find_named_object(this->constant_); | |
a7f064d5 | 2754 | |
2755 | this->seen_ = true; | |
d5b605df | 2756 | Expression::traverse(&init, &find_named_object); |
a7f064d5 | 2757 | this->seen_ = false; |
2758 | ||
d5b605df | 2759 | if (find_named_object.found()) |
2760 | { | |
5c13bd80 | 2761 | if (this->type_ == NULL || !this->type_->is_error()) |
a7f064d5 | 2762 | { |
2763 | this->report_error(_("constant refers to itself")); | |
2764 | this->type_ = Type::make_error_type(); | |
2765 | } | |
d5b605df | 2766 | return; |
2767 | } | |
a7f064d5 | 2768 | } |
2769 | ||
2770 | // Check types of a const reference. | |
2771 | ||
2772 | void | |
2773 | Const_expression::do_check_types(Gogo*) | |
2774 | { | |
5c13bd80 | 2775 | if (this->type_ != NULL && this->type_->is_error()) |
a7f064d5 | 2776 | return; |
2777 | ||
2778 | this->check_for_init_loop(); | |
d5b605df | 2779 | |
0c77715b | 2780 | // Check that numeric constant fits in type. |
2781 | if (this->type_ != NULL && this->type_->is_numeric_type()) | |
e440a328 | 2782 | { |
0c77715b | 2783 | Numeric_constant nc; |
2784 | if (this->constant_->const_value()->expr()->numeric_constant_value(&nc)) | |
e440a328 | 2785 | { |
0c77715b | 2786 | if (!nc.set_type(this->type_, true, this->location())) |
2787 | this->set_is_error(); | |
e440a328 | 2788 | } |
e440a328 | 2789 | } |
2790 | } | |
2791 | ||
ea664253 | 2792 | // Return the backend representation for a const reference. |
e440a328 | 2793 | |
ea664253 | 2794 | Bexpression* |
2795 | Const_expression::do_get_backend(Translate_context* context) | |
e440a328 | 2796 | { |
2c809f8f | 2797 | if (this->type_ != NULL && this->type_->is_error()) |
ea664253 | 2798 | return context->backend()->error_expression(); |
e440a328 | 2799 | |
2800 | // If the type has been set for this expression, but the underlying | |
2801 | // object is an abstract int or float, we try to get the abstract | |
2802 | // value. Otherwise we may lose something in the conversion. | |
f2de4532 | 2803 | Expression* expr = this->constant_->const_value()->expr(); |
e440a328 | 2804 | if (this->type_ != NULL |
0c77715b | 2805 | && this->type_->is_numeric_type() |
a68492b4 | 2806 | && (this->constant_->const_value()->type() == NULL |
2807 | || this->constant_->const_value()->type()->is_abstract())) | |
e440a328 | 2808 | { |
0c77715b | 2809 | Numeric_constant nc; |
2810 | if (expr->numeric_constant_value(&nc) | |
2811 | && nc.set_type(this->type_, false, this->location())) | |
e440a328 | 2812 | { |
0c77715b | 2813 | Expression* e = nc.expression(this->location()); |
ea664253 | 2814 | return e->get_backend(context); |
e440a328 | 2815 | } |
e440a328 | 2816 | } |
2817 | ||
2c809f8f | 2818 | if (this->type_ != NULL) |
f2de4532 | 2819 | expr = Expression::make_cast(this->type_, expr, this->location()); |
ea664253 | 2820 | return expr->get_backend(context); |
e440a328 | 2821 | } |
2822 | ||
d751bb78 | 2823 | // Dump ast representation for constant expression. |
2824 | ||
2825 | void | |
2826 | Const_expression::do_dump_expression(Ast_dump_context* ast_dump_context) const | |
2827 | { | |
2828 | ast_dump_context->ostream() << this->constant_->name(); | |
2829 | } | |
2830 | ||
e440a328 | 2831 | // Make a reference to a constant in an expression. |
2832 | ||
2833 | Expression* | |
2834 | Expression::make_const_reference(Named_object* constant, | |
b13c66cd | 2835 | Location location) |
e440a328 | 2836 | { |
2837 | return new Const_expression(constant, location); | |
2838 | } | |
2839 | ||
d5b605df | 2840 | // Find a named object in an expression. |
2841 | ||
2842 | int | |
2843 | Find_named_object::expression(Expression** pexpr) | |
2844 | { | |
2845 | switch ((*pexpr)->classification()) | |
2846 | { | |
2847 | case Expression::EXPRESSION_CONST_REFERENCE: | |
a7f064d5 | 2848 | { |
2849 | Const_expression* ce = static_cast<Const_expression*>(*pexpr); | |
2850 | if (ce->named_object() == this->no_) | |
2851 | break; | |
2852 | ||
2853 | // We need to check a constant initializer explicitly, as | |
2854 | // loops here will not be caught by the loop checking for | |
2855 | // variable initializers. | |
2856 | ce->check_for_init_loop(); | |
2857 | ||
2858 | return TRAVERSE_CONTINUE; | |
2859 | } | |
2860 | ||
d5b605df | 2861 | case Expression::EXPRESSION_VAR_REFERENCE: |
2862 | if ((*pexpr)->var_expression()->named_object() == this->no_) | |
2863 | break; | |
2864 | return TRAVERSE_CONTINUE; | |
2865 | case Expression::EXPRESSION_FUNC_REFERENCE: | |
2866 | if ((*pexpr)->func_expression()->named_object() == this->no_) | |
2867 | break; | |
2868 | return TRAVERSE_CONTINUE; | |
2869 | default: | |
2870 | return TRAVERSE_CONTINUE; | |
2871 | } | |
2872 | this->found_ = true; | |
2873 | return TRAVERSE_EXIT; | |
2874 | } | |
2875 | ||
e440a328 | 2876 | // The nil value. |
2877 | ||
2878 | class Nil_expression : public Expression | |
2879 | { | |
2880 | public: | |
b13c66cd | 2881 | Nil_expression(Location location) |
e440a328 | 2882 | : Expression(EXPRESSION_NIL, location) |
2883 | { } | |
2884 | ||
2885 | static Expression* | |
2886 | do_import(Import*); | |
2887 | ||
2888 | protected: | |
2889 | bool | |
2890 | do_is_constant() const | |
2891 | { return true; } | |
2892 | ||
f9ca30f9 | 2893 | bool |
2894 | do_is_immutable() const | |
2895 | { return true; } | |
2896 | ||
e440a328 | 2897 | Type* |
2898 | do_type() | |
2899 | { return Type::make_nil_type(); } | |
2900 | ||
2901 | void | |
2902 | do_determine_type(const Type_context*) | |
2903 | { } | |
2904 | ||
2905 | Expression* | |
2906 | do_copy() | |
2907 | { return this; } | |
2908 | ||
ea664253 | 2909 | Bexpression* |
2910 | do_get_backend(Translate_context* context) | |
2911 | { return context->backend()->nil_pointer_expression(); } | |
e440a328 | 2912 | |
2913 | void | |
2914 | do_export(Export* exp) const | |
2915 | { exp->write_c_string("nil"); } | |
d751bb78 | 2916 | |
2917 | void | |
2918 | do_dump_expression(Ast_dump_context* ast_dump_context) const | |
2919 | { ast_dump_context->ostream() << "nil"; } | |
e440a328 | 2920 | }; |
2921 | ||
2922 | // Import a nil expression. | |
2923 | ||
2924 | Expression* | |
2925 | Nil_expression::do_import(Import* imp) | |
2926 | { | |
2927 | imp->require_c_string("nil"); | |
2928 | return Expression::make_nil(imp->location()); | |
2929 | } | |
2930 | ||
2931 | // Make a nil expression. | |
2932 | ||
2933 | Expression* | |
b13c66cd | 2934 | Expression::make_nil(Location location) |
e440a328 | 2935 | { |
2936 | return new Nil_expression(location); | |
2937 | } | |
2938 | ||
2939 | // The value of the predeclared constant iota. This is little more | |
2940 | // than a marker. This will be lowered to an integer in | |
2941 | // Const_expression::do_lower, which is where we know the value that | |
2942 | // it should have. | |
2943 | ||
2944 | class Iota_expression : public Parser_expression | |
2945 | { | |
2946 | public: | |
b13c66cd | 2947 | Iota_expression(Location location) |
e440a328 | 2948 | : Parser_expression(EXPRESSION_IOTA, location) |
2949 | { } | |
2950 | ||
2951 | protected: | |
2952 | Expression* | |
ceeb4318 | 2953 | do_lower(Gogo*, Named_object*, Statement_inserter*, int) |
c3e6f413 | 2954 | { go_unreachable(); } |
e440a328 | 2955 | |
2956 | // There should only ever be one of these. | |
2957 | Expression* | |
2958 | do_copy() | |
c3e6f413 | 2959 | { go_unreachable(); } |
d751bb78 | 2960 | |
2961 | void | |
2962 | do_dump_expression(Ast_dump_context* ast_dump_context) const | |
2963 | { ast_dump_context->ostream() << "iota"; } | |
e440a328 | 2964 | }; |
2965 | ||
2966 | // Make an iota expression. This is only called for one case: the | |
2967 | // value of the predeclared constant iota. | |
2968 | ||
2969 | Expression* | |
2970 | Expression::make_iota() | |
2971 | { | |
b13c66cd | 2972 | static Iota_expression iota_expression(Linemap::unknown_location()); |
e440a328 | 2973 | return &iota_expression; |
2974 | } | |
2975 | ||
2976 | // A type conversion expression. | |
2977 | ||
2978 | class Type_conversion_expression : public Expression | |
2979 | { | |
2980 | public: | |
2981 | Type_conversion_expression(Type* type, Expression* expr, | |
b13c66cd | 2982 | Location location) |
e440a328 | 2983 | : Expression(EXPRESSION_CONVERSION, location), |
2984 | type_(type), expr_(expr), may_convert_function_types_(false) | |
2985 | { } | |
2986 | ||
2987 | // Return the type to which we are converting. | |
2988 | Type* | |
2989 | type() const | |
2990 | { return this->type_; } | |
2991 | ||
2992 | // Return the expression which we are converting. | |
2993 | Expression* | |
2994 | expr() const | |
2995 | { return this->expr_; } | |
2996 | ||
2997 | // Permit converting from one function type to another. This is | |
2998 | // used internally for method expressions. | |
2999 | void | |
3000 | set_may_convert_function_types() | |
3001 | { | |
3002 | this->may_convert_function_types_ = true; | |
3003 | } | |
3004 | ||
3005 | // Import a type conversion expression. | |
3006 | static Expression* | |
3007 | do_import(Import*); | |
3008 | ||
3009 | protected: | |
3010 | int | |
3011 | do_traverse(Traverse* traverse); | |
3012 | ||
3013 | Expression* | |
ceeb4318 | 3014 | do_lower(Gogo*, Named_object*, Statement_inserter*, int); |
e440a328 | 3015 | |
35a54f17 | 3016 | Expression* |
3017 | do_flatten(Gogo*, Named_object*, Statement_inserter*); | |
3018 | ||
e440a328 | 3019 | bool |
1ca01a59 | 3020 | do_is_constant() const; |
e440a328 | 3021 | |
0e168074 | 3022 | bool |
3023 | do_is_immutable() const; | |
3024 | ||
e440a328 | 3025 | bool |
0c77715b | 3026 | do_numeric_constant_value(Numeric_constant*) const; |
e440a328 | 3027 | |
3028 | bool | |
3029 | do_string_constant_value(std::string*) const; | |
3030 | ||
3031 | Type* | |
3032 | do_type() | |
3033 | { return this->type_; } | |
3034 | ||
3035 | void | |
3036 | do_determine_type(const Type_context*) | |
3037 | { | |
3038 | Type_context subcontext(this->type_, false); | |
3039 | this->expr_->determine_type(&subcontext); | |
3040 | } | |
3041 | ||
3042 | void | |
3043 | do_check_types(Gogo*); | |
3044 | ||
3045 | Expression* | |
3046 | do_copy() | |
3047 | { | |
3048 | return new Type_conversion_expression(this->type_, this->expr_->copy(), | |
3049 | this->location()); | |
3050 | } | |
3051 | ||
ea664253 | 3052 | Bexpression* |
3053 | do_get_backend(Translate_context* context); | |
e440a328 | 3054 | |
3055 | void | |
3056 | do_export(Export*) const; | |
3057 | ||
d751bb78 | 3058 | void |
3059 | do_dump_expression(Ast_dump_context*) const; | |
3060 | ||
e440a328 | 3061 | private: |
3062 | // The type to convert to. | |
3063 | Type* type_; | |
3064 | // The expression to convert. | |
3065 | Expression* expr_; | |
3066 | // True if this is permitted to convert function types. This is | |
3067 | // used internally for method expressions. | |
3068 | bool may_convert_function_types_; | |
3069 | }; | |
3070 | ||
3071 | // Traversal. | |
3072 | ||
3073 | int | |
3074 | Type_conversion_expression::do_traverse(Traverse* traverse) | |
3075 | { | |
3076 | if (Expression::traverse(&this->expr_, traverse) == TRAVERSE_EXIT | |
3077 | || Type::traverse(this->type_, traverse) == TRAVERSE_EXIT) | |
3078 | return TRAVERSE_EXIT; | |
3079 | return TRAVERSE_CONTINUE; | |
3080 | } | |
3081 | ||
3082 | // Convert to a constant at lowering time. | |
3083 | ||
3084 | Expression* | |
ceeb4318 | 3085 | Type_conversion_expression::do_lower(Gogo*, Named_object*, |
3086 | Statement_inserter*, int) | |
e440a328 | 3087 | { |
3088 | Type* type = this->type_; | |
3089 | Expression* val = this->expr_; | |
b13c66cd | 3090 | Location location = this->location(); |
e440a328 | 3091 | |
0c77715b | 3092 | if (type->is_numeric_type()) |
e440a328 | 3093 | { |
0c77715b | 3094 | Numeric_constant nc; |
3095 | if (val->numeric_constant_value(&nc)) | |
e440a328 | 3096 | { |
0c77715b | 3097 | if (!nc.set_type(type, true, location)) |
3098 | return Expression::make_error(location); | |
3099 | return nc.expression(location); | |
e440a328 | 3100 | } |
e440a328 | 3101 | } |
3102 | ||
55072f2b | 3103 | if (type->is_slice_type()) |
e440a328 | 3104 | { |
3105 | Type* element_type = type->array_type()->element_type()->forwarded(); | |
60963afd | 3106 | bool is_byte = (element_type->integer_type() != NULL |
3107 | && element_type->integer_type()->is_byte()); | |
3108 | bool is_rune = (element_type->integer_type() != NULL | |
3109 | && element_type->integer_type()->is_rune()); | |
3110 | if (is_byte || is_rune) | |
e440a328 | 3111 | { |
3112 | std::string s; | |
3113 | if (val->string_constant_value(&s)) | |
3114 | { | |
3115 | Expression_list* vals = new Expression_list(); | |
3116 | if (is_byte) | |
3117 | { | |
3118 | for (std::string::const_iterator p = s.begin(); | |
3119 | p != s.end(); | |
3120 | p++) | |
3121 | { | |
e67508fa | 3122 | unsigned char c = static_cast<unsigned char>(*p); |
3123 | vals->push_back(Expression::make_integer_ul(c, | |
3124 | element_type, | |
3125 | location)); | |
e440a328 | 3126 | } |
3127 | } | |
3128 | else | |
3129 | { | |
3130 | const char *p = s.data(); | |
3131 | const char *pend = s.data() + s.length(); | |
3132 | while (p < pend) | |
3133 | { | |
3134 | unsigned int c; | |
3135 | int adv = Lex::fetch_char(p, &c); | |
3136 | if (adv == 0) | |
3137 | { | |
3138 | warning_at(this->location(), 0, | |
3139 | "invalid UTF-8 encoding"); | |
3140 | adv = 1; | |
3141 | } | |
3142 | p += adv; | |
e67508fa | 3143 | vals->push_back(Expression::make_integer_ul(c, |
3144 | element_type, | |
3145 | location)); | |
e440a328 | 3146 | } |
3147 | } | |
3148 | ||
3149 | return Expression::make_slice_composite_literal(type, vals, | |
3150 | location); | |
3151 | } | |
3152 | } | |
3153 | } | |
3154 | ||
3155 | return this; | |
3156 | } | |
3157 | ||
35a54f17 | 3158 | // Flatten a type conversion by using a temporary variable for the slice |
3159 | // in slice to string conversions. | |
3160 | ||
3161 | Expression* | |
3162 | Type_conversion_expression::do_flatten(Gogo*, Named_object*, | |
3163 | Statement_inserter* inserter) | |
3164 | { | |
2c809f8f | 3165 | if (((this->type()->is_string_type() |
3166 | && this->expr_->type()->is_slice_type()) | |
8ba8cc87 | 3167 | || this->expr_->type()->interface_type() != NULL) |
35a54f17 | 3168 | && !this->expr_->is_variable()) |
3169 | { | |
3170 | Temporary_statement* temp = | |
3171 | Statement::make_temporary(NULL, this->expr_, this->location()); | |
3172 | inserter->insert(temp); | |
3173 | this->expr_ = Expression::make_temporary_reference(temp, this->location()); | |
3174 | } | |
3175 | return this; | |
3176 | } | |
3177 | ||
1ca01a59 | 3178 | // Return whether a type conversion is a constant. |
3179 | ||
3180 | bool | |
3181 | Type_conversion_expression::do_is_constant() const | |
3182 | { | |
3183 | if (!this->expr_->is_constant()) | |
3184 | return false; | |
3185 | ||
3186 | // A conversion to a type that may not be used as a constant is not | |
3187 | // a constant. For example, []byte(nil). | |
3188 | Type* type = this->type_; | |
3189 | if (type->integer_type() == NULL | |
3190 | && type->float_type() == NULL | |
3191 | && type->complex_type() == NULL | |
3192 | && !type->is_boolean_type() | |
3193 | && !type->is_string_type()) | |
3194 | return false; | |
3195 | ||
3196 | return true; | |
3197 | } | |
3198 | ||
0e168074 | 3199 | // Return whether a type conversion is immutable. |
3200 | ||
3201 | bool | |
3202 | Type_conversion_expression::do_is_immutable() const | |
3203 | { | |
3204 | Type* type = this->type_; | |
3205 | Type* expr_type = this->expr_->type(); | |
3206 | ||
3207 | if (type->interface_type() != NULL | |
3208 | || expr_type->interface_type() != NULL) | |
3209 | return false; | |
3210 | ||
3211 | if (!this->expr_->is_immutable()) | |
3212 | return false; | |
3213 | ||
3214 | if (Type::are_identical(type, expr_type, false, NULL)) | |
3215 | return true; | |
3216 | ||
3217 | return type->is_basic_type() && expr_type->is_basic_type(); | |
3218 | } | |
3219 | ||
0c77715b | 3220 | // Return the constant numeric value if there is one. |
e440a328 | 3221 | |
3222 | bool | |
0c77715b | 3223 | Type_conversion_expression::do_numeric_constant_value( |
3224 | Numeric_constant* nc) const | |
e440a328 | 3225 | { |
0c77715b | 3226 | if (!this->type_->is_numeric_type()) |
e440a328 | 3227 | return false; |
0c77715b | 3228 | if (!this->expr_->numeric_constant_value(nc)) |
e440a328 | 3229 | return false; |
0c77715b | 3230 | return nc->set_type(this->type_, false, this->location()); |
e440a328 | 3231 | } |
3232 | ||
3233 | // Return the constant string value if there is one. | |
3234 | ||
3235 | bool | |
3236 | Type_conversion_expression::do_string_constant_value(std::string* val) const | |
3237 | { | |
3238 | if (this->type_->is_string_type() | |
3239 | && this->expr_->type()->integer_type() != NULL) | |
3240 | { | |
0c77715b | 3241 | Numeric_constant nc; |
3242 | if (this->expr_->numeric_constant_value(&nc)) | |
e440a328 | 3243 | { |
0c77715b | 3244 | unsigned long ival; |
3245 | if (nc.to_unsigned_long(&ival) == Numeric_constant::NC_UL_VALID) | |
e440a328 | 3246 | { |
0c77715b | 3247 | val->clear(); |
3248 | Lex::append_char(ival, true, val, this->location()); | |
e440a328 | 3249 | return true; |
3250 | } | |
3251 | } | |
e440a328 | 3252 | } |
3253 | ||
3254 | // FIXME: Could handle conversion from const []int here. | |
3255 | ||
3256 | return false; | |
3257 | } | |
3258 | ||
3259 | // Check that types are convertible. | |
3260 | ||
3261 | void | |
3262 | Type_conversion_expression::do_check_types(Gogo*) | |
3263 | { | |
3264 | Type* type = this->type_; | |
3265 | Type* expr_type = this->expr_->type(); | |
3266 | std::string reason; | |
3267 | ||
5c13bd80 | 3268 | if (type->is_error() || expr_type->is_error()) |
842f6425 | 3269 | { |
842f6425 | 3270 | this->set_is_error(); |
3271 | return; | |
3272 | } | |
3273 | ||
e440a328 | 3274 | if (this->may_convert_function_types_ |
3275 | && type->function_type() != NULL | |
3276 | && expr_type->function_type() != NULL) | |
3277 | return; | |
3278 | ||
3279 | if (Type::are_convertible(type, expr_type, &reason)) | |
3280 | return; | |
3281 | ||
3282 | error_at(this->location(), "%s", reason.c_str()); | |
3283 | this->set_is_error(); | |
3284 | } | |
3285 | ||
ea664253 | 3286 | // Get the backend representation for a type conversion. |
e440a328 | 3287 | |
ea664253 | 3288 | Bexpression* |
3289 | Type_conversion_expression::do_get_backend(Translate_context* context) | |
e440a328 | 3290 | { |
e440a328 | 3291 | Type* type = this->type_; |
3292 | Type* expr_type = this->expr_->type(); | |
2c809f8f | 3293 | |
3294 | Gogo* gogo = context->gogo(); | |
3295 | Btype* btype = type->get_backend(gogo); | |
ea664253 | 3296 | Bexpression* bexpr = this->expr_->get_backend(context); |
2c809f8f | 3297 | Location loc = this->location(); |
3298 | ||
3299 | if (Type::are_identical(type, expr_type, false, NULL)) | |
ea664253 | 3300 | return gogo->backend()->convert_expression(btype, bexpr, loc); |
2c809f8f | 3301 | else if (type->interface_type() != NULL |
3302 | || expr_type->interface_type() != NULL) | |
e440a328 | 3303 | { |
2c809f8f | 3304 | Expression* conversion = |
3305 | Expression::convert_for_assignment(gogo, type, this->expr_, | |
3306 | this->location()); | |
ea664253 | 3307 | return conversion->get_backend(context); |
e440a328 | 3308 | } |
3309 | else if (type->is_string_type() | |
3310 | && expr_type->integer_type() != NULL) | |
3311 | { | |
2c809f8f | 3312 | mpz_t intval; |
3313 | Numeric_constant nc; | |
3314 | if (this->expr_->numeric_constant_value(&nc) | |
3315 | && nc.to_int(&intval) | |
3316 | && mpz_fits_ushort_p(intval)) | |
e440a328 | 3317 | { |
e440a328 | 3318 | std::string s; |
2c809f8f | 3319 | Lex::append_char(mpz_get_ui(intval), true, &s, loc); |
3320 | mpz_clear(intval); | |
3321 | Expression* se = Expression::make_string(s, loc); | |
ea664253 | 3322 | return se->get_backend(context); |
e440a328 | 3323 | } |
3324 | ||
f16ab008 | 3325 | Expression* i2s_expr = |
2c809f8f | 3326 | Runtime::make_call(Runtime::INT_TO_STRING, loc, 1, this->expr_); |
ea664253 | 3327 | return Expression::make_cast(type, i2s_expr, loc)->get_backend(context); |
e440a328 | 3328 | } |
55072f2b | 3329 | else if (type->is_string_type() && expr_type->is_slice_type()) |
e440a328 | 3330 | { |
55072f2b | 3331 | Array_type* a = expr_type->array_type(); |
e440a328 | 3332 | Type* e = a->element_type()->forwarded(); |
c484d925 | 3333 | go_assert(e->integer_type() != NULL); |
35a54f17 | 3334 | go_assert(this->expr_->is_variable()); |
3335 | ||
3336 | Runtime::Function code; | |
60963afd | 3337 | if (e->integer_type()->is_byte()) |
35a54f17 | 3338 | code = Runtime::BYTE_ARRAY_TO_STRING; |
e440a328 | 3339 | else |
35a54f17 | 3340 | { |
3341 | go_assert(e->integer_type()->is_rune()); | |
3342 | code = Runtime::INT_ARRAY_TO_STRING; | |
3343 | } | |
3344 | Expression* valptr = a->get_value_pointer(gogo, this->expr_); | |
3345 | Expression* len = a->get_length(gogo, this->expr_); | |
ea664253 | 3346 | return Runtime::make_call(code, loc, 2, valptr, |
3347 | len)->get_backend(context); | |
e440a328 | 3348 | } |
411eb89e | 3349 | else if (type->is_slice_type() && expr_type->is_string_type()) |
e440a328 | 3350 | { |
3351 | Type* e = type->array_type()->element_type()->forwarded(); | |
c484d925 | 3352 | go_assert(e->integer_type() != NULL); |
6c252e42 | 3353 | |
2c809f8f | 3354 | Runtime::Function code; |
60963afd | 3355 | if (e->integer_type()->is_byte()) |
2c809f8f | 3356 | code = Runtime::STRING_TO_BYTE_ARRAY; |
e440a328 | 3357 | else |
3358 | { | |
60963afd | 3359 | go_assert(e->integer_type()->is_rune()); |
2c809f8f | 3360 | code = Runtime::STRING_TO_INT_ARRAY; |
e440a328 | 3361 | } |
2c809f8f | 3362 | Expression* s2a = Runtime::make_call(code, loc, 1, this->expr_); |
ea664253 | 3363 | return Expression::make_unsafe_cast(type, s2a, loc)->get_backend(context); |
2c809f8f | 3364 | } |
3365 | else if (type->is_numeric_type()) | |
3366 | { | |
3367 | go_assert(Type::are_convertible(type, expr_type, NULL)); | |
ea664253 | 3368 | return gogo->backend()->convert_expression(btype, bexpr, loc); |
e440a328 | 3369 | } |
3370 | else if ((type->is_unsafe_pointer_type() | |
2c809f8f | 3371 | && (expr_type->points_to() != NULL |
3372 | || expr_type->integer_type())) | |
3373 | || (expr_type->is_unsafe_pointer_type() | |
3374 | && type->points_to() != NULL) | |
3375 | || (this->may_convert_function_types_ | |
3376 | && type->function_type() != NULL | |
3377 | && expr_type->function_type() != NULL)) | |
ea664253 | 3378 | return gogo->backend()->convert_expression(btype, bexpr, loc); |
e440a328 | 3379 | else |
2c809f8f | 3380 | { |
3381 | Expression* conversion = | |
3382 | Expression::convert_for_assignment(gogo, type, this->expr_, loc); | |
ea664253 | 3383 | return conversion->get_backend(context); |
2c809f8f | 3384 | } |
e440a328 | 3385 | } |
3386 | ||
3387 | // Output a type conversion in a constant expression. | |
3388 | ||
3389 | void | |
3390 | Type_conversion_expression::do_export(Export* exp) const | |
3391 | { | |
3392 | exp->write_c_string("convert("); | |
3393 | exp->write_type(this->type_); | |
3394 | exp->write_c_string(", "); | |
3395 | this->expr_->export_expression(exp); | |
3396 | exp->write_c_string(")"); | |
3397 | } | |
3398 | ||
3399 | // Import a type conversion or a struct construction. | |
3400 | ||
3401 | Expression* | |
3402 | Type_conversion_expression::do_import(Import* imp) | |
3403 | { | |
3404 | imp->require_c_string("convert("); | |
3405 | Type* type = imp->read_type(); | |
3406 | imp->require_c_string(", "); | |
3407 | Expression* val = Expression::import_expression(imp); | |
3408 | imp->require_c_string(")"); | |
3409 | return Expression::make_cast(type, val, imp->location()); | |
3410 | } | |
3411 | ||
d751bb78 | 3412 | // Dump ast representation for a type conversion expression. |
3413 | ||
3414 | void | |
3415 | Type_conversion_expression::do_dump_expression( | |
3416 | Ast_dump_context* ast_dump_context) const | |
3417 | { | |
3418 | ast_dump_context->dump_type(this->type_); | |
3419 | ast_dump_context->ostream() << "("; | |
3420 | ast_dump_context->dump_expression(this->expr_); | |
3421 | ast_dump_context->ostream() << ") "; | |
3422 | } | |
3423 | ||
e440a328 | 3424 | // Make a type cast expression. |
3425 | ||
3426 | Expression* | |
b13c66cd | 3427 | Expression::make_cast(Type* type, Expression* val, Location location) |
e440a328 | 3428 | { |
3429 | if (type->is_error_type() || val->is_error_expression()) | |
3430 | return Expression::make_error(location); | |
3431 | return new Type_conversion_expression(type, val, location); | |
3432 | } | |
3433 | ||
9581e91d | 3434 | // An unsafe type conversion, used to pass values to builtin functions. |
3435 | ||
3436 | class Unsafe_type_conversion_expression : public Expression | |
3437 | { | |
3438 | public: | |
3439 | Unsafe_type_conversion_expression(Type* type, Expression* expr, | |
b13c66cd | 3440 | Location location) |
9581e91d | 3441 | : Expression(EXPRESSION_UNSAFE_CONVERSION, location), |
3442 | type_(type), expr_(expr) | |
3443 | { } | |
3444 | ||
3445 | protected: | |
3446 | int | |
3447 | do_traverse(Traverse* traverse); | |
3448 | ||
aa5ae575 | 3449 | bool |
3450 | do_is_immutable() const; | |
3451 | ||
9581e91d | 3452 | Type* |
3453 | do_type() | |
3454 | { return this->type_; } | |
3455 | ||
3456 | void | |
3457 | do_determine_type(const Type_context*) | |
a9182619 | 3458 | { this->expr_->determine_type_no_context(); } |
9581e91d | 3459 | |
3460 | Expression* | |
3461 | do_copy() | |
3462 | { | |
3463 | return new Unsafe_type_conversion_expression(this->type_, | |
3464 | this->expr_->copy(), | |
3465 | this->location()); | |
3466 | } | |
3467 | ||
ea664253 | 3468 | Bexpression* |
3469 | do_get_backend(Translate_context*); | |
9581e91d | 3470 | |
d751bb78 | 3471 | void |
3472 | do_dump_expression(Ast_dump_context*) const; | |
3473 | ||
9581e91d | 3474 | private: |
3475 | // The type to convert to. | |
3476 | Type* type_; | |
3477 | // The expression to convert. | |
3478 | Expression* expr_; | |
3479 | }; | |
3480 | ||
3481 | // Traversal. | |
3482 | ||
3483 | int | |
3484 | Unsafe_type_conversion_expression::do_traverse(Traverse* traverse) | |
3485 | { | |
3486 | if (Expression::traverse(&this->expr_, traverse) == TRAVERSE_EXIT | |
3487 | || Type::traverse(this->type_, traverse) == TRAVERSE_EXIT) | |
3488 | return TRAVERSE_EXIT; | |
3489 | return TRAVERSE_CONTINUE; | |
3490 | } | |
3491 | ||
aa5ae575 | 3492 | // Return whether an unsafe type conversion is immutable. |
3493 | ||
3494 | bool | |
3495 | Unsafe_type_conversion_expression::do_is_immutable() const | |
3496 | { | |
3497 | Type* type = this->type_; | |
3498 | Type* expr_type = this->expr_->type(); | |
3499 | ||
3500 | if (type->interface_type() != NULL | |
3501 | || expr_type->interface_type() != NULL) | |
3502 | return false; | |
3503 | ||
3504 | if (!this->expr_->is_immutable()) | |
3505 | return false; | |
3506 | ||
3507 | if (Type::are_convertible(type, expr_type, NULL)) | |
3508 | return true; | |
3509 | ||
3510 | return type->is_basic_type() && expr_type->is_basic_type(); | |
3511 | } | |
3512 | ||
9581e91d | 3513 | // Convert to backend representation. |
3514 | ||
ea664253 | 3515 | Bexpression* |
3516 | Unsafe_type_conversion_expression::do_get_backend(Translate_context* context) | |
9581e91d | 3517 | { |
3518 | // We are only called for a limited number of cases. | |
3519 | ||
3520 | Type* t = this->type_; | |
3521 | Type* et = this->expr_->type(); | |
2c809f8f | 3522 | if (t->array_type() != NULL) |
3523 | go_assert(et->array_type() != NULL | |
3524 | && t->is_slice_type() == et->is_slice_type()); | |
3525 | else if (t->struct_type() != NULL) | |
9581e91d | 3526 | { |
2c809f8f | 3527 | if (t->named_type() != NULL |
3528 | && et->named_type() != NULL | |
3529 | && !Type::are_convertible(t, et, NULL)) | |
3530 | { | |
3531 | go_assert(saw_errors()); | |
ea664253 | 3532 | return context->backend()->error_expression(); |
2c809f8f | 3533 | } |
3534 | ||
3535 | go_assert(et->struct_type() != NULL | |
3536 | && Type::are_convertible(t, et, NULL)); | |
3537 | } | |
3538 | else if (t->map_type() != NULL) | |
c484d925 | 3539 | go_assert(et->map_type() != NULL); |
9581e91d | 3540 | else if (t->channel_type() != NULL) |
c484d925 | 3541 | go_assert(et->channel_type() != NULL); |
09ea332d | 3542 | else if (t->points_to() != NULL) |
2c809f8f | 3543 | go_assert(et->points_to() != NULL |
3544 | || et->channel_type() != NULL | |
3545 | || et->map_type() != NULL | |
3546 | || et->function_type() != NULL | |
3547 | || et->is_nil_type()); | |
9581e91d | 3548 | else if (et->is_unsafe_pointer_type()) |
c484d925 | 3549 | go_assert(t->points_to() != NULL); |
2c809f8f | 3550 | else if (t->interface_type() != NULL) |
9581e91d | 3551 | { |
2c809f8f | 3552 | bool empty_iface = t->interface_type()->is_empty(); |
c484d925 | 3553 | go_assert(et->interface_type() != NULL |
2c809f8f | 3554 | && et->interface_type()->is_empty() == empty_iface); |
9581e91d | 3555 | } |
588e3cf9 | 3556 | else if (t->integer_type() != NULL) |
2c809f8f | 3557 | go_assert(et->is_boolean_type() |
3558 | || et->integer_type() != NULL | |
3559 | || et->function_type() != NULL | |
3560 | || et->points_to() != NULL | |
3561 | || et->map_type() != NULL | |
8ba8cc87 | 3562 | || et->channel_type() != NULL |
3563 | || et->is_nil_type()); | |
9581e91d | 3564 | else |
c3e6f413 | 3565 | go_unreachable(); |
9581e91d | 3566 | |
2c809f8f | 3567 | Gogo* gogo = context->gogo(); |
3568 | Btype* btype = t->get_backend(gogo); | |
ea664253 | 3569 | Bexpression* bexpr = this->expr_->get_backend(context); |
2c809f8f | 3570 | Location loc = this->location(); |
ea664253 | 3571 | return gogo->backend()->convert_expression(btype, bexpr, loc); |
9581e91d | 3572 | } |
3573 | ||
d751bb78 | 3574 | // Dump ast representation for an unsafe type conversion expression. |
3575 | ||
3576 | void | |
3577 | Unsafe_type_conversion_expression::do_dump_expression( | |
3578 | Ast_dump_context* ast_dump_context) const | |
3579 | { | |
3580 | ast_dump_context->dump_type(this->type_); | |
3581 | ast_dump_context->ostream() << "("; | |
3582 | ast_dump_context->dump_expression(this->expr_); | |
3583 | ast_dump_context->ostream() << ") "; | |
3584 | } | |
3585 | ||
9581e91d | 3586 | // Make an unsafe type conversion expression. |
3587 | ||
3588 | Expression* | |
3589 | Expression::make_unsafe_cast(Type* type, Expression* expr, | |
b13c66cd | 3590 | Location location) |
9581e91d | 3591 | { |
3592 | return new Unsafe_type_conversion_expression(type, expr, location); | |
3593 | } | |
3594 | ||
76f85fd6 | 3595 | // Class Unary_expression. |
e440a328 | 3596 | |
3597 | // If we are taking the address of a composite literal, and the | |
2c809f8f | 3598 | // contents are not constant, then we want to make a heap expression |
e440a328 | 3599 | // instead. |
3600 | ||
3601 | Expression* | |
ceeb4318 | 3602 | Unary_expression::do_lower(Gogo*, Named_object*, Statement_inserter*, int) |
e440a328 | 3603 | { |
b13c66cd | 3604 | Location loc = this->location(); |
e440a328 | 3605 | Operator op = this->op_; |
3606 | Expression* expr = this->expr_; | |
3607 | ||
3608 | if (op == OPERATOR_MULT && expr->is_type_expression()) | |
3609 | return Expression::make_type(Type::make_pointer_type(expr->type()), loc); | |
3610 | ||
3611 | // *&x simplifies to x. *(*T)(unsafe.Pointer)(&x) does not require | |
3612 | // moving x to the heap. FIXME: Is it worth doing a real escape | |
3613 | // analysis here? This case is found in math/unsafe.go and is | |
3614 | // therefore worth special casing. | |
3615 | if (op == OPERATOR_MULT) | |
3616 | { | |
3617 | Expression* e = expr; | |
3618 | while (e->classification() == EXPRESSION_CONVERSION) | |
3619 | { | |
3620 | Type_conversion_expression* te | |
3621 | = static_cast<Type_conversion_expression*>(e); | |
3622 | e = te->expr(); | |
3623 | } | |
3624 | ||
3625 | if (e->classification() == EXPRESSION_UNARY) | |
3626 | { | |
3627 | Unary_expression* ue = static_cast<Unary_expression*>(e); | |
3628 | if (ue->op_ == OPERATOR_AND) | |
3629 | { | |
3630 | if (e == expr) | |
3631 | { | |
3632 | // *&x == x. | |
f4dea966 | 3633 | if (!ue->expr_->is_addressable() && !ue->create_temp_) |
3634 | { | |
3635 | error_at(ue->location(), | |
3636 | "invalid operand for unary %<&%>"); | |
3637 | this->set_is_error(); | |
3638 | } | |
e440a328 | 3639 | return ue->expr_; |
3640 | } | |
3641 | ue->set_does_not_escape(); | |
3642 | } | |
3643 | } | |
3644 | } | |
3645 | ||
55661ce9 | 3646 | // Catching an invalid indirection of unsafe.Pointer here avoid |
3647 | // having to deal with TYPE_VOID in other places. | |
3648 | if (op == OPERATOR_MULT && expr->type()->is_unsafe_pointer_type()) | |
3649 | { | |
3650 | error_at(this->location(), "invalid indirect of %<unsafe.Pointer%>"); | |
3651 | return Expression::make_error(this->location()); | |
3652 | } | |
3653 | ||
d9f3743a | 3654 | // Check for an invalid pointer dereference. We need to do this |
3655 | // here because Unary_expression::do_type will return an error type | |
3656 | // in this case. That can cause code to appear erroneous, and | |
3657 | // therefore disappear at lowering time, without any error message. | |
3658 | if (op == OPERATOR_MULT && expr->type()->points_to() == NULL) | |
3659 | { | |
3660 | this->report_error(_("expected pointer")); | |
3661 | return Expression::make_error(this->location()); | |
3662 | } | |
3663 | ||
59a401fe | 3664 | if (op == OPERATOR_PLUS || op == OPERATOR_MINUS || op == OPERATOR_XOR) |
e440a328 | 3665 | { |
0c77715b | 3666 | Numeric_constant nc; |
3667 | if (expr->numeric_constant_value(&nc)) | |
e440a328 | 3668 | { |
0c77715b | 3669 | Numeric_constant result; |
3670 | if (Unary_expression::eval_constant(op, &nc, loc, &result)) | |
3671 | return result.expression(loc); | |
e440a328 | 3672 | } |
3673 | } | |
3674 | ||
3675 | return this; | |
3676 | } | |
3677 | ||
f9ca30f9 | 3678 | // Flatten expression if a nil check must be performed and create temporary |
3679 | // variables if necessary. | |
3680 | ||
3681 | Expression* | |
3682 | Unary_expression::do_flatten(Gogo* gogo, Named_object*, | |
3683 | Statement_inserter* inserter) | |
3684 | { | |
f4dea966 | 3685 | if (this->is_error_expression() || this->expr_->is_error_expression()) |
3686 | return Expression::make_error(this->location()); | |
3687 | ||
f9ca30f9 | 3688 | Location location = this->location(); |
3689 | if (this->op_ == OPERATOR_MULT | |
3690 | && !this->expr_->is_variable()) | |
3691 | { | |
3692 | go_assert(this->expr_->type()->points_to() != NULL); | |
3693 | Type* ptype = this->expr_->type()->points_to(); | |
3694 | if (!ptype->is_void_type()) | |
3695 | { | |
3696 | Btype* pbtype = ptype->get_backend(gogo); | |
3697 | size_t s = gogo->backend()->type_size(pbtype); | |
3698 | if (s >= 4096 || this->issue_nil_check_) | |
3699 | { | |
3700 | Temporary_statement* temp = | |
3701 | Statement::make_temporary(NULL, this->expr_, location); | |
3702 | inserter->insert(temp); | |
3703 | this->expr_ = | |
3704 | Expression::make_temporary_reference(temp, location); | |
3705 | } | |
3706 | } | |
3707 | } | |
3708 | ||
3709 | if (this->create_temp_ && !this->expr_->is_variable()) | |
3710 | { | |
3711 | Temporary_statement* temp = | |
3712 | Statement::make_temporary(NULL, this->expr_, location); | |
3713 | inserter->insert(temp); | |
3714 | this->expr_ = Expression::make_temporary_reference(temp, location); | |
3715 | } | |
3716 | ||
3717 | return this; | |
3718 | } | |
3719 | ||
e440a328 | 3720 | // Return whether a unary expression is a constant. |
3721 | ||
3722 | bool | |
3723 | Unary_expression::do_is_constant() const | |
3724 | { | |
3725 | if (this->op_ == OPERATOR_MULT) | |
3726 | { | |
3727 | // Indirecting through a pointer is only constant if the object | |
3728 | // to which the expression points is constant, but we currently | |
3729 | // have no way to determine that. | |
3730 | return false; | |
3731 | } | |
3732 | else if (this->op_ == OPERATOR_AND) | |
3733 | { | |
3734 | // Taking the address of a variable is constant if it is a | |
f9ca30f9 | 3735 | // global variable, not constant otherwise. In other cases taking the |
3736 | // address is probably not a constant. | |
e440a328 | 3737 | Var_expression* ve = this->expr_->var_expression(); |
3738 | if (ve != NULL) | |
3739 | { | |
3740 | Named_object* no = ve->named_object(); | |
3741 | return no->is_variable() && no->var_value()->is_global(); | |
3742 | } | |
3743 | return false; | |
3744 | } | |
3745 | else | |
3746 | return this->expr_->is_constant(); | |
3747 | } | |
3748 | ||
0c77715b | 3749 | // Apply unary opcode OP to UNC, setting NC. Return true if this |
3750 | // could be done, false if not. Issue errors for overflow. | |
e440a328 | 3751 | |
3752 | bool | |
0c77715b | 3753 | Unary_expression::eval_constant(Operator op, const Numeric_constant* unc, |
3754 | Location location, Numeric_constant* nc) | |
e440a328 | 3755 | { |
3756 | switch (op) | |
3757 | { | |
3758 | case OPERATOR_PLUS: | |
0c77715b | 3759 | *nc = *unc; |
e440a328 | 3760 | return true; |
0c77715b | 3761 | |
e440a328 | 3762 | case OPERATOR_MINUS: |
0c77715b | 3763 | if (unc->is_int() || unc->is_rune()) |
3764 | break; | |
3765 | else if (unc->is_float()) | |
3766 | { | |
3767 | mpfr_t uval; | |
3768 | unc->get_float(&uval); | |
3769 | mpfr_t val; | |
3770 | mpfr_init(val); | |
3771 | mpfr_neg(val, uval, GMP_RNDN); | |
3772 | nc->set_float(unc->type(), val); | |
3773 | mpfr_clear(uval); | |
3774 | mpfr_clear(val); | |
3775 | return true; | |
3776 | } | |
3777 | else if (unc->is_complex()) | |
3778 | { | |
fcbea5e4 | 3779 | mpc_t uval; |
3780 | unc->get_complex(&uval); | |
3781 | mpc_t val; | |
3782 | mpc_init2(val, mpc_precision); | |
3783 | mpc_neg(val, uval, MPC_RNDNN); | |
3784 | nc->set_complex(unc->type(), val); | |
3785 | mpc_clear(uval); | |
3786 | mpc_clear(val); | |
0c77715b | 3787 | return true; |
3788 | } | |
e440a328 | 3789 | else |
0c77715b | 3790 | go_unreachable(); |
e440a328 | 3791 | |
0c77715b | 3792 | case OPERATOR_XOR: |
3793 | break; | |
68448d53 | 3794 | |
59a401fe | 3795 | case OPERATOR_NOT: |
e440a328 | 3796 | case OPERATOR_AND: |
3797 | case OPERATOR_MULT: | |
3798 | return false; | |
0c77715b | 3799 | |
e440a328 | 3800 | default: |
c3e6f413 | 3801 | go_unreachable(); |
e440a328 | 3802 | } |
e440a328 | 3803 | |
0c77715b | 3804 | if (!unc->is_int() && !unc->is_rune()) |
3805 | return false; | |
3806 | ||
3807 | mpz_t uval; | |
8387e1df | 3808 | if (unc->is_rune()) |
3809 | unc->get_rune(&uval); | |
3810 | else | |
3811 | unc->get_int(&uval); | |
0c77715b | 3812 | mpz_t val; |
3813 | mpz_init(val); | |
e440a328 | 3814 | |
e440a328 | 3815 | switch (op) |
3816 | { | |
e440a328 | 3817 | case OPERATOR_MINUS: |
0c77715b | 3818 | mpz_neg(val, uval); |
3819 | break; | |
3820 | ||
e440a328 | 3821 | case OPERATOR_NOT: |
0c77715b | 3822 | mpz_set_ui(val, mpz_cmp_si(uval, 0) == 0 ? 1 : 0); |
3823 | break; | |
3824 | ||
e440a328 | 3825 | case OPERATOR_XOR: |
0c77715b | 3826 | { |
3827 | Type* utype = unc->type(); | |
3828 | if (utype->integer_type() == NULL | |
3829 | || utype->integer_type()->is_abstract()) | |
3830 | mpz_com(val, uval); | |
3831 | else | |
3832 | { | |
3833 | // The number of HOST_WIDE_INTs that it takes to represent | |
3834 | // UVAL. | |
3835 | size_t count = ((mpz_sizeinbase(uval, 2) | |
3836 | + HOST_BITS_PER_WIDE_INT | |
3837 | - 1) | |
3838 | / HOST_BITS_PER_WIDE_INT); | |
e440a328 | 3839 | |
0c77715b | 3840 | unsigned HOST_WIDE_INT* phwi = new unsigned HOST_WIDE_INT[count]; |
3841 | memset(phwi, 0, count * sizeof(HOST_WIDE_INT)); | |
3842 | ||
3843 | size_t obits = utype->integer_type()->bits(); | |
3844 | ||
3845 | if (!utype->integer_type()->is_unsigned() && mpz_sgn(uval) < 0) | |
3846 | { | |
3847 | mpz_t adj; | |
3848 | mpz_init_set_ui(adj, 1); | |
3849 | mpz_mul_2exp(adj, adj, obits); | |
3850 | mpz_add(uval, uval, adj); | |
3851 | mpz_clear(adj); | |
3852 | } | |
3853 | ||
3854 | size_t ecount; | |
3855 | mpz_export(phwi, &ecount, -1, sizeof(HOST_WIDE_INT), 0, 0, uval); | |
3856 | go_assert(ecount <= count); | |
3857 | ||
3858 | // Trim down to the number of words required by the type. | |
3859 | size_t ocount = ((obits + HOST_BITS_PER_WIDE_INT - 1) | |
3860 | / HOST_BITS_PER_WIDE_INT); | |
3861 | go_assert(ocount <= count); | |
3862 | ||
3863 | for (size_t i = 0; i < ocount; ++i) | |
3864 | phwi[i] = ~phwi[i]; | |
3865 | ||
3866 | size_t clearbits = ocount * HOST_BITS_PER_WIDE_INT - obits; | |
3867 | if (clearbits != 0) | |
3868 | phwi[ocount - 1] &= (((unsigned HOST_WIDE_INT) (HOST_WIDE_INT) -1) | |
3869 | >> clearbits); | |
3870 | ||
3871 | mpz_import(val, ocount, -1, sizeof(HOST_WIDE_INT), 0, 0, phwi); | |
3872 | ||
3873 | if (!utype->integer_type()->is_unsigned() | |
3874 | && mpz_tstbit(val, obits - 1)) | |
3875 | { | |
3876 | mpz_t adj; | |
3877 | mpz_init_set_ui(adj, 1); | |
3878 | mpz_mul_2exp(adj, adj, obits); | |
3879 | mpz_sub(val, val, adj); | |
3880 | mpz_clear(adj); | |
3881 | } | |
3882 | ||
3883 | delete[] phwi; | |
3884 | } | |
3885 | } | |
3886 | break; | |
e440a328 | 3887 | |
e440a328 | 3888 | default: |
c3e6f413 | 3889 | go_unreachable(); |
e440a328 | 3890 | } |
e440a328 | 3891 | |
0c77715b | 3892 | if (unc->is_rune()) |
3893 | nc->set_rune(NULL, val); | |
e440a328 | 3894 | else |
0c77715b | 3895 | nc->set_int(NULL, val); |
e440a328 | 3896 | |
0c77715b | 3897 | mpz_clear(uval); |
3898 | mpz_clear(val); | |
e440a328 | 3899 | |
0c77715b | 3900 | return nc->set_type(unc->type(), true, location); |
e440a328 | 3901 | } |
3902 | ||
0c77715b | 3903 | // Return the integral constant value of a unary expression, if it has one. |
e440a328 | 3904 | |
3905 | bool | |
0c77715b | 3906 | Unary_expression::do_numeric_constant_value(Numeric_constant* nc) const |
e440a328 | 3907 | { |
0c77715b | 3908 | Numeric_constant unc; |
3909 | if (!this->expr_->numeric_constant_value(&unc)) | |
3910 | return false; | |
3911 | return Unary_expression::eval_constant(this->op_, &unc, this->location(), | |
3912 | nc); | |
e440a328 | 3913 | } |
3914 | ||
3915 | // Return the type of a unary expression. | |
3916 | ||
3917 | Type* | |
3918 | Unary_expression::do_type() | |
3919 | { | |
3920 | switch (this->op_) | |
3921 | { | |
3922 | case OPERATOR_PLUS: | |
3923 | case OPERATOR_MINUS: | |
3924 | case OPERATOR_NOT: | |
3925 | case OPERATOR_XOR: | |
3926 | return this->expr_->type(); | |
3927 | ||
3928 | case OPERATOR_AND: | |
3929 | return Type::make_pointer_type(this->expr_->type()); | |
3930 | ||
3931 | case OPERATOR_MULT: | |
3932 | { | |
3933 | Type* subtype = this->expr_->type(); | |
3934 | Type* points_to = subtype->points_to(); | |
3935 | if (points_to == NULL) | |
3936 | return Type::make_error_type(); | |
3937 | return points_to; | |
3938 | } | |
3939 | ||
3940 | default: | |
c3e6f413 | 3941 | go_unreachable(); |
e440a328 | 3942 | } |
3943 | } | |
3944 | ||
3945 | // Determine abstract types for a unary expression. | |
3946 | ||
3947 | void | |
3948 | Unary_expression::do_determine_type(const Type_context* context) | |
3949 | { | |
3950 | switch (this->op_) | |
3951 | { | |
3952 | case OPERATOR_PLUS: | |
3953 | case OPERATOR_MINUS: | |
3954 | case OPERATOR_NOT: | |
3955 | case OPERATOR_XOR: | |
3956 | this->expr_->determine_type(context); | |
3957 | break; | |
3958 | ||
3959 | case OPERATOR_AND: | |
3960 | // Taking the address of something. | |
3961 | { | |
3962 | Type* subtype = (context->type == NULL | |
3963 | ? NULL | |
3964 | : context->type->points_to()); | |
3965 | Type_context subcontext(subtype, false); | |
3966 | this->expr_->determine_type(&subcontext); | |
3967 | } | |
3968 | break; | |
3969 | ||
3970 | case OPERATOR_MULT: | |
3971 | // Indirecting through a pointer. | |
3972 | { | |
3973 | Type* subtype = (context->type == NULL | |
3974 | ? NULL | |
3975 | : Type::make_pointer_type(context->type)); | |
3976 | Type_context subcontext(subtype, false); | |
3977 | this->expr_->determine_type(&subcontext); | |
3978 | } | |
3979 | break; | |
3980 | ||
3981 | default: | |
c3e6f413 | 3982 | go_unreachable(); |
e440a328 | 3983 | } |
3984 | } | |
3985 | ||
3986 | // Check types for a unary expression. | |
3987 | ||
3988 | void | |
3989 | Unary_expression::do_check_types(Gogo*) | |
3990 | { | |
9fe897ef | 3991 | Type* type = this->expr_->type(); |
5c13bd80 | 3992 | if (type->is_error()) |
9fe897ef | 3993 | { |
3994 | this->set_is_error(); | |
3995 | return; | |
3996 | } | |
3997 | ||
e440a328 | 3998 | switch (this->op_) |
3999 | { | |
4000 | case OPERATOR_PLUS: | |
4001 | case OPERATOR_MINUS: | |
9fe897ef | 4002 | if (type->integer_type() == NULL |
4003 | && type->float_type() == NULL | |
4004 | && type->complex_type() == NULL) | |
4005 | this->report_error(_("expected numeric type")); | |
e440a328 | 4006 | break; |
4007 | ||
4008 | case OPERATOR_NOT: | |
59a401fe | 4009 | if (!type->is_boolean_type()) |
4010 | this->report_error(_("expected boolean type")); | |
4011 | break; | |
4012 | ||
e440a328 | 4013 | case OPERATOR_XOR: |
9fe897ef | 4014 | if (type->integer_type() == NULL |
4015 | && !type->is_boolean_type()) | |
4016 | this->report_error(_("expected integer or boolean type")); | |
e440a328 | 4017 | break; |
4018 | ||
4019 | case OPERATOR_AND: | |
4020 | if (!this->expr_->is_addressable()) | |
09ea332d | 4021 | { |
4022 | if (!this->create_temp_) | |
f4dea966 | 4023 | { |
4024 | error_at(this->location(), "invalid operand for unary %<&%>"); | |
4025 | this->set_is_error(); | |
4026 | } | |
09ea332d | 4027 | } |
e440a328 | 4028 | else |
56080003 | 4029 | { |
4030 | this->expr_->address_taken(this->escapes_); | |
4031 | this->expr_->issue_nil_check(); | |
4032 | } | |
e440a328 | 4033 | break; |
4034 | ||
4035 | case OPERATOR_MULT: | |
4036 | // Indirecting through a pointer. | |
9fe897ef | 4037 | if (type->points_to() == NULL) |
4038 | this->report_error(_("expected pointer")); | |
e440a328 | 4039 | break; |
4040 | ||
4041 | default: | |
c3e6f413 | 4042 | go_unreachable(); |
e440a328 | 4043 | } |
4044 | } | |
4045 | ||
ea664253 | 4046 | // Get the backend representation for a unary expression. |
e440a328 | 4047 | |
ea664253 | 4048 | Bexpression* |
4049 | Unary_expression::do_get_backend(Translate_context* context) | |
e440a328 | 4050 | { |
1b1f2abf | 4051 | Gogo* gogo = context->gogo(); |
e9d3367e | 4052 | Location loc = this->location(); |
4053 | ||
4054 | // Taking the address of a set-and-use-temporary expression requires | |
4055 | // setting the temporary and then taking the address. | |
4056 | if (this->op_ == OPERATOR_AND) | |
4057 | { | |
4058 | Set_and_use_temporary_expression* sut = | |
4059 | this->expr_->set_and_use_temporary_expression(); | |
4060 | if (sut != NULL) | |
4061 | { | |
4062 | Temporary_statement* temp = sut->temporary(); | |
4063 | Bvariable* bvar = temp->get_backend_variable(context); | |
f9ca30f9 | 4064 | Bexpression* bvar_expr = gogo->backend()->var_expression(bvar, loc); |
ea664253 | 4065 | Bexpression* bval = sut->expression()->get_backend(context); |
f9ca30f9 | 4066 | |
4067 | Bstatement* bassign = | |
4068 | gogo->backend()->assignment_statement(bvar_expr, bval, loc); | |
4069 | Bexpression* bvar_addr = | |
4070 | gogo->backend()->address_expression(bvar_expr, loc); | |
ea664253 | 4071 | return gogo->backend()->compound_expression(bassign, bvar_addr, loc); |
e9d3367e | 4072 | } |
4073 | } | |
4074 | ||
f9ca30f9 | 4075 | Bexpression* ret; |
ea664253 | 4076 | Bexpression* bexpr = this->expr_->get_backend(context); |
f9ca30f9 | 4077 | Btype* btype = this->expr_->type()->get_backend(gogo); |
e440a328 | 4078 | switch (this->op_) |
4079 | { | |
4080 | case OPERATOR_PLUS: | |
f9ca30f9 | 4081 | ret = bexpr; |
4082 | break; | |
e440a328 | 4083 | |
4084 | case OPERATOR_MINUS: | |
f9ca30f9 | 4085 | ret = gogo->backend()->unary_expression(this->op_, bexpr, loc); |
4086 | ret = gogo->backend()->convert_expression(btype, ret, loc); | |
4087 | break; | |
e440a328 | 4088 | |
4089 | case OPERATOR_NOT: | |
e440a328 | 4090 | case OPERATOR_XOR: |
f9ca30f9 | 4091 | ret = gogo->backend()->unary_expression(this->op_, bexpr, loc); |
4092 | break; | |
e440a328 | 4093 | |
4094 | case OPERATOR_AND: | |
09ea332d | 4095 | if (!this->create_temp_) |
4096 | { | |
4097 | // We should not see a non-constant constructor here; cases | |
4098 | // where we would see one should have been moved onto the | |
4099 | // heap at parse time. Taking the address of a nonconstant | |
4100 | // constructor will not do what the programmer expects. | |
f9ca30f9 | 4101 | |
4102 | go_assert(!this->expr_->is_composite_literal() | |
4103 | || this->expr_->is_immutable()); | |
24060bf9 | 4104 | if (this->expr_->classification() == EXPRESSION_UNARY) |
4105 | { | |
4106 | Unary_expression* ue = | |
4107 | static_cast<Unary_expression*>(this->expr_); | |
4108 | go_assert(ue->op() != OPERATOR_AND); | |
4109 | } | |
09ea332d | 4110 | } |
e440a328 | 4111 | |
f23d7786 | 4112 | static unsigned int counter; |
4113 | char buf[100]; | |
4114 | if (this->is_gc_root_ || this->is_slice_init_) | |
76f85fd6 | 4115 | { |
f23d7786 | 4116 | bool copy_to_heap = false; |
4117 | if (this->is_gc_root_) | |
4118 | { | |
4119 | // Build a decl for a GC root variable. GC roots are mutable, so | |
4120 | // they cannot be represented as an immutable_struct in the | |
4121 | // backend. | |
4122 | static unsigned int root_counter; | |
4123 | snprintf(buf, sizeof buf, "gc%u", root_counter); | |
4124 | ++root_counter; | |
4125 | } | |
4126 | else | |
4127 | { | |
4128 | // Build a decl for a slice value initializer. An immutable slice | |
4129 | // value initializer may have to be copied to the heap if it | |
4130 | // contains pointers in a non-constant context. | |
4131 | snprintf(buf, sizeof buf, "C%u", counter); | |
4132 | ++counter; | |
4133 | ||
4134 | Array_type* at = this->expr_->type()->array_type(); | |
4135 | go_assert(at != NULL); | |
4136 | ||
4137 | // If we are not copying the value to the heap, we will only | |
4138 | // initialize the value once, so we can use this directly | |
4139 | // rather than copying it. In that case we can't make it | |
4140 | // read-only, because the program is permitted to change it. | |
4141 | copy_to_heap = (at->element_type()->has_pointer() | |
4142 | && !context->is_const()); | |
4143 | } | |
4144 | Bvariable* implicit = | |
aa5ae575 | 4145 | gogo->backend()->implicit_variable(buf, btype, true, copy_to_heap, |
5892f89f | 4146 | false, 0); |
aa5ae575 | 4147 | gogo->backend()->implicit_variable_set_init(implicit, buf, btype, |
4148 | true, copy_to_heap, false, | |
4149 | bexpr); | |
f23d7786 | 4150 | bexpr = gogo->backend()->var_expression(implicit, loc); |
76f85fd6 | 4151 | } |
4152 | else if ((this->expr_->is_composite_literal() | |
f9ca30f9 | 4153 | || this->expr_->string_expression() != NULL) |
4154 | && this->expr_->is_immutable()) | |
4155 | { | |
76f85fd6 | 4156 | // Build a decl for a constant constructor. |
f9ca30f9 | 4157 | snprintf(buf, sizeof buf, "C%u", counter); |
4158 | ++counter; | |
4159 | ||
4160 | Bvariable* decl = | |
4161 | gogo->backend()->immutable_struct(buf, true, false, btype, loc); | |
4162 | gogo->backend()->immutable_struct_set_init(decl, buf, true, false, | |
4163 | btype, loc, bexpr); | |
4164 | bexpr = gogo->backend()->var_expression(decl, loc); | |
4165 | } | |
09ea332d | 4166 | |
f9ca30f9 | 4167 | go_assert(!this->create_temp_ || this->expr_->is_variable()); |
4168 | ret = gogo->backend()->address_expression(bexpr, loc); | |
4169 | break; | |
e440a328 | 4170 | |
4171 | case OPERATOR_MULT: | |
4172 | { | |
f9ca30f9 | 4173 | go_assert(this->expr_->type()->points_to() != NULL); |
e440a328 | 4174 | |
4175 | // If we are dereferencing the pointer to a large struct, we | |
4176 | // need to check for nil. We don't bother to check for small | |
4177 | // structs because we expect the system to crash on a nil | |
56080003 | 4178 | // pointer dereference. However, if we know the address of this |
4179 | // expression is being taken, we must always check for nil. | |
f9ca30f9 | 4180 | |
4181 | Type* ptype = this->expr_->type()->points_to(); | |
4182 | Btype* pbtype = ptype->get_backend(gogo); | |
4183 | if (!ptype->is_void_type()) | |
e440a328 | 4184 | { |
f9ca30f9 | 4185 | size_t s = gogo->backend()->type_size(pbtype); |
4186 | if (s >= 4096 || this->issue_nil_check_) | |
19b4f09b | 4187 | { |
f9ca30f9 | 4188 | go_assert(this->expr_->is_variable()); |
ea664253 | 4189 | Bexpression* nil = |
4190 | Expression::make_nil(loc)->get_backend(context); | |
f9ca30f9 | 4191 | Bexpression* compare = |
4192 | gogo->backend()->binary_expression(OPERATOR_EQEQ, bexpr, | |
4193 | nil, loc); | |
f9ca30f9 | 4194 | Bexpression* crash = |
ea664253 | 4195 | gogo->runtime_error(RUNTIME_ERROR_NIL_DEREFERENCE, |
4196 | loc)->get_backend(context); | |
f9ca30f9 | 4197 | bexpr = gogo->backend()->conditional_expression(btype, compare, |
4198 | crash, bexpr, | |
4199 | loc); | |
4200 | ||
19b4f09b | 4201 | } |
e440a328 | 4202 | } |
9b27b43c | 4203 | ret = gogo->backend()->indirect_expression(pbtype, bexpr, false, loc); |
e440a328 | 4204 | } |
f9ca30f9 | 4205 | break; |
e440a328 | 4206 | |
4207 | default: | |
c3e6f413 | 4208 | go_unreachable(); |
e440a328 | 4209 | } |
f9ca30f9 | 4210 | |
ea664253 | 4211 | return ret; |
e440a328 | 4212 | } |
4213 | ||
4214 | // Export a unary expression. | |
4215 | ||
4216 | void | |
4217 | Unary_expression::do_export(Export* exp) const | |
4218 | { | |
4219 | switch (this->op_) | |
4220 | { | |
4221 | case OPERATOR_PLUS: | |
4222 | exp->write_c_string("+ "); | |
4223 | break; | |
4224 | case OPERATOR_MINUS: | |
4225 | exp->write_c_string("- "); | |
4226 | break; | |
4227 | case OPERATOR_NOT: | |
4228 | exp->write_c_string("! "); | |
4229 | break; | |
4230 | case OPERATOR_XOR: | |
4231 | exp->write_c_string("^ "); | |
4232 | break; | |
4233 | case OPERATOR_AND: | |
4234 | case OPERATOR_MULT: | |
4235 | default: | |
c3e6f413 | 4236 | go_unreachable(); |
e440a328 | 4237 | } |
4238 | this->expr_->export_expression(exp); | |
4239 | } | |
4240 | ||
4241 | // Import a unary expression. | |
4242 | ||
4243 | Expression* | |
4244 | Unary_expression::do_import(Import* imp) | |
4245 | { | |
4246 | Operator op; | |
4247 | switch (imp->get_char()) | |
4248 | { | |
4249 | case '+': | |
4250 | op = OPERATOR_PLUS; | |
4251 | break; | |
4252 | case '-': | |
4253 | op = OPERATOR_MINUS; | |
4254 | break; | |
4255 | case '!': | |
4256 | op = OPERATOR_NOT; | |
4257 | break; | |
4258 | case '^': | |
4259 | op = OPERATOR_XOR; | |
4260 | break; | |
4261 | default: | |
c3e6f413 | 4262 | go_unreachable(); |
e440a328 | 4263 | } |
4264 | imp->require_c_string(" "); | |
4265 | Expression* expr = Expression::import_expression(imp); | |
4266 | return Expression::make_unary(op, expr, imp->location()); | |
4267 | } | |
4268 | ||
d751bb78 | 4269 | // Dump ast representation of an unary expression. |
4270 | ||
4271 | void | |
4272 | Unary_expression::do_dump_expression(Ast_dump_context* ast_dump_context) const | |
4273 | { | |
4274 | ast_dump_context->dump_operator(this->op_); | |
4275 | ast_dump_context->ostream() << "("; | |
4276 | ast_dump_context->dump_expression(this->expr_); | |
4277 | ast_dump_context->ostream() << ") "; | |
4278 | } | |
4279 | ||
e440a328 | 4280 | // Make a unary expression. |
4281 | ||
4282 | Expression* | |
b13c66cd | 4283 | Expression::make_unary(Operator op, Expression* expr, Location location) |
e440a328 | 4284 | { |
4285 | return new Unary_expression(op, expr, location); | |
4286 | } | |
4287 | ||
4288 | // If this is an indirection through a pointer, return the expression | |
4289 | // being pointed through. Otherwise return this. | |
4290 | ||
4291 | Expression* | |
4292 | Expression::deref() | |
4293 | { | |
4294 | if (this->classification_ == EXPRESSION_UNARY) | |
4295 | { | |
4296 | Unary_expression* ue = static_cast<Unary_expression*>(this); | |
4297 | if (ue->op() == OPERATOR_MULT) | |
4298 | return ue->operand(); | |
4299 | } | |
4300 | return this; | |
4301 | } | |
4302 | ||
4303 | // Class Binary_expression. | |
4304 | ||
4305 | // Traversal. | |
4306 | ||
4307 | int | |
4308 | Binary_expression::do_traverse(Traverse* traverse) | |
4309 | { | |
4310 | int t = Expression::traverse(&this->left_, traverse); | |
4311 | if (t == TRAVERSE_EXIT) | |
4312 | return TRAVERSE_EXIT; | |
4313 | return Expression::traverse(&this->right_, traverse); | |
4314 | } | |
4315 | ||
0c77715b | 4316 | // Return the type to use for a binary operation on operands of |
4317 | // LEFT_TYPE and RIGHT_TYPE. These are the types of constants and as | |
4318 | // such may be NULL or abstract. | |
4319 | ||
4320 | bool | |
4321 | Binary_expression::operation_type(Operator op, Type* left_type, | |
4322 | Type* right_type, Type** result_type) | |
4323 | { | |
4324 | if (left_type != right_type | |
4325 | && !left_type->is_abstract() | |
4326 | && !right_type->is_abstract() | |
4327 | && left_type->base() != right_type->base() | |
4328 | && op != OPERATOR_LSHIFT | |
4329 | && op != OPERATOR_RSHIFT) | |
4330 | { | |
4331 | // May be a type error--let it be diagnosed elsewhere. | |
4332 | return false; | |
4333 | } | |
4334 | ||
4335 | if (op == OPERATOR_LSHIFT || op == OPERATOR_RSHIFT) | |
4336 | { | |
4337 | if (left_type->integer_type() != NULL) | |
4338 | *result_type = left_type; | |
4339 | else | |
4340 | *result_type = Type::make_abstract_integer_type(); | |
4341 | } | |
4342 | else if (!left_type->is_abstract() && left_type->named_type() != NULL) | |
4343 | *result_type = left_type; | |
4344 | else if (!right_type->is_abstract() && right_type->named_type() != NULL) | |
4345 | *result_type = right_type; | |
4346 | else if (!left_type->is_abstract()) | |
4347 | *result_type = left_type; | |
4348 | else if (!right_type->is_abstract()) | |
4349 | *result_type = right_type; | |
4350 | else if (left_type->complex_type() != NULL) | |
4351 | *result_type = left_type; | |
4352 | else if (right_type->complex_type() != NULL) | |
4353 | *result_type = right_type; | |
4354 | else if (left_type->float_type() != NULL) | |
4355 | *result_type = left_type; | |
4356 | else if (right_type->float_type() != NULL) | |
4357 | *result_type = right_type; | |
4358 | else if (left_type->integer_type() != NULL | |
4359 | && left_type->integer_type()->is_rune()) | |
4360 | *result_type = left_type; | |
4361 | else if (right_type->integer_type() != NULL | |
4362 | && right_type->integer_type()->is_rune()) | |
4363 | *result_type = right_type; | |
4364 | else | |
4365 | *result_type = left_type; | |
4366 | ||
4367 | return true; | |
4368 | } | |
4369 | ||
4370 | // Convert an integer comparison code and an operator to a boolean | |
4371 | // value. | |
e440a328 | 4372 | |
4373 | bool | |
0c77715b | 4374 | Binary_expression::cmp_to_bool(Operator op, int cmp) |
e440a328 | 4375 | { |
e440a328 | 4376 | switch (op) |
4377 | { | |
4378 | case OPERATOR_EQEQ: | |
0c77715b | 4379 | return cmp == 0; |
4380 | break; | |
e440a328 | 4381 | case OPERATOR_NOTEQ: |
0c77715b | 4382 | return cmp != 0; |
4383 | break; | |
e440a328 | 4384 | case OPERATOR_LT: |
0c77715b | 4385 | return cmp < 0; |
4386 | break; | |
e440a328 | 4387 | case OPERATOR_LE: |
0c77715b | 4388 | return cmp <= 0; |
e440a328 | 4389 | case OPERATOR_GT: |
0c77715b | 4390 | return cmp > 0; |
e440a328 | 4391 | case OPERATOR_GE: |
0c77715b | 4392 | return cmp >= 0; |
e440a328 | 4393 | default: |
c3e6f413 | 4394 | go_unreachable(); |
e440a328 | 4395 | } |
4396 | } | |
4397 | ||
0c77715b | 4398 | // Compare constants according to OP. |
e440a328 | 4399 | |
4400 | bool | |
0c77715b | 4401 | Binary_expression::compare_constant(Operator op, Numeric_constant* left_nc, |
4402 | Numeric_constant* right_nc, | |
4403 | Location location, bool* result) | |
e440a328 | 4404 | { |
0c77715b | 4405 | Type* left_type = left_nc->type(); |
4406 | Type* right_type = right_nc->type(); | |
4407 | ||
4408 | Type* type; | |
4409 | if (!Binary_expression::operation_type(op, left_type, right_type, &type)) | |
4410 | return false; | |
4411 | ||
4412 | // When comparing an untyped operand to a typed operand, we are | |
4413 | // effectively coercing the untyped operand to the other operand's | |
4414 | // type, so make sure that is valid. | |
4415 | if (!left_nc->set_type(type, true, location) | |
4416 | || !right_nc->set_type(type, true, location)) | |
4417 | return false; | |
4418 | ||
4419 | bool ret; | |
4420 | int cmp; | |
4421 | if (type->complex_type() != NULL) | |
4422 | { | |
4423 | if (op != OPERATOR_EQEQ && op != OPERATOR_NOTEQ) | |
4424 | return false; | |
4425 | ret = Binary_expression::compare_complex(left_nc, right_nc, &cmp); | |
4426 | } | |
4427 | else if (type->float_type() != NULL) | |
4428 | ret = Binary_expression::compare_float(left_nc, right_nc, &cmp); | |
e440a328 | 4429 | else |
0c77715b | 4430 | ret = Binary_expression::compare_integer(left_nc, right_nc, &cmp); |
4431 | ||
4432 | if (ret) | |
4433 | *result = Binary_expression::cmp_to_bool(op, cmp); | |
4434 | ||
4435 | return ret; | |
4436 | } | |
4437 | ||
4438 | // Compare integer constants. | |
4439 | ||
4440 | bool | |
4441 | Binary_expression::compare_integer(const Numeric_constant* left_nc, | |
4442 | const Numeric_constant* right_nc, | |
4443 | int* cmp) | |
4444 | { | |
4445 | mpz_t left_val; | |
4446 | if (!left_nc->to_int(&left_val)) | |
4447 | return false; | |
4448 | mpz_t right_val; | |
4449 | if (!right_nc->to_int(&right_val)) | |
e440a328 | 4450 | { |
0c77715b | 4451 | mpz_clear(left_val); |
4452 | return false; | |
e440a328 | 4453 | } |
0c77715b | 4454 | |
4455 | *cmp = mpz_cmp(left_val, right_val); | |
4456 | ||
4457 | mpz_clear(left_val); | |
4458 | mpz_clear(right_val); | |
4459 | ||
4460 | return true; | |
4461 | } | |
4462 | ||
4463 | // Compare floating point constants. | |
4464 | ||
4465 | bool | |
4466 | Binary_expression::compare_float(const Numeric_constant* left_nc, | |
4467 | const Numeric_constant* right_nc, | |
4468 | int* cmp) | |
4469 | { | |
4470 | mpfr_t left_val; | |
4471 | if (!left_nc->to_float(&left_val)) | |
4472 | return false; | |
4473 | mpfr_t right_val; | |
4474 | if (!right_nc->to_float(&right_val)) | |
e440a328 | 4475 | { |
0c77715b | 4476 | mpfr_clear(left_val); |
4477 | return false; | |
4478 | } | |
4479 | ||
4480 | // We already coerced both operands to the same type. If that type | |
4481 | // is not an abstract type, we need to round the values accordingly. | |
4482 | Type* type = left_nc->type(); | |
4483 | if (!type->is_abstract() && type->float_type() != NULL) | |
4484 | { | |
4485 | int bits = type->float_type()->bits(); | |
4486 | mpfr_prec_round(left_val, bits, GMP_RNDN); | |
4487 | mpfr_prec_round(right_val, bits, GMP_RNDN); | |
e440a328 | 4488 | } |
0c77715b | 4489 | |
4490 | *cmp = mpfr_cmp(left_val, right_val); | |
4491 | ||
4492 | mpfr_clear(left_val); | |
4493 | mpfr_clear(right_val); | |
4494 | ||
4495 | return true; | |
e440a328 | 4496 | } |
4497 | ||
0c77715b | 4498 | // Compare complex constants. Complex numbers may only be compared |
4499 | // for equality. | |
e440a328 | 4500 | |
4501 | bool | |
0c77715b | 4502 | Binary_expression::compare_complex(const Numeric_constant* left_nc, |
4503 | const Numeric_constant* right_nc, | |
4504 | int* cmp) | |
e440a328 | 4505 | { |
fcbea5e4 | 4506 | mpc_t left_val; |
4507 | if (!left_nc->to_complex(&left_val)) | |
0c77715b | 4508 | return false; |
fcbea5e4 | 4509 | mpc_t right_val; |
4510 | if (!right_nc->to_complex(&right_val)) | |
e440a328 | 4511 | { |
fcbea5e4 | 4512 | mpc_clear(left_val); |
0c77715b | 4513 | return false; |
e440a328 | 4514 | } |
0c77715b | 4515 | |
4516 | // We already coerced both operands to the same type. If that type | |
4517 | // is not an abstract type, we need to round the values accordingly. | |
4518 | Type* type = left_nc->type(); | |
4519 | if (!type->is_abstract() && type->complex_type() != NULL) | |
e440a328 | 4520 | { |
0c77715b | 4521 | int bits = type->complex_type()->bits(); |
fcbea5e4 | 4522 | mpfr_prec_round(mpc_realref(left_val), bits / 2, GMP_RNDN); |
4523 | mpfr_prec_round(mpc_imagref(left_val), bits / 2, GMP_RNDN); | |
4524 | mpfr_prec_round(mpc_realref(right_val), bits / 2, GMP_RNDN); | |
4525 | mpfr_prec_round(mpc_imagref(right_val), bits / 2, GMP_RNDN); | |
e440a328 | 4526 | } |
0c77715b | 4527 | |
fcbea5e4 | 4528 | *cmp = mpc_cmp(left_val, right_val) != 0; |
0c77715b | 4529 | |
fcbea5e4 | 4530 | mpc_clear(left_val); |
4531 | mpc_clear(right_val); | |
0c77715b | 4532 | |
4533 | return true; | |
e440a328 | 4534 | } |
4535 | ||
0c77715b | 4536 | // Apply binary opcode OP to LEFT_NC and RIGHT_NC, setting NC. Return |
4537 | // true if this could be done, false if not. Issue errors at LOCATION | |
4538 | // as appropriate. | |
e440a328 | 4539 | |
4540 | bool | |
0c77715b | 4541 | Binary_expression::eval_constant(Operator op, Numeric_constant* left_nc, |
4542 | Numeric_constant* right_nc, | |
4543 | Location location, Numeric_constant* nc) | |
e440a328 | 4544 | { |
e440a328 | 4545 | switch (op) |
4546 | { | |
4547 | case OPERATOR_OROR: | |
4548 | case OPERATOR_ANDAND: | |
4549 | case OPERATOR_EQEQ: | |
4550 | case OPERATOR_NOTEQ: | |
4551 | case OPERATOR_LT: | |
4552 | case OPERATOR_LE: | |
4553 | case OPERATOR_GT: | |
4554 | case OPERATOR_GE: | |
9767e2d3 | 4555 | // These return boolean values, not numeric. |
4556 | return false; | |
0c77715b | 4557 | default: |
4558 | break; | |
4559 | } | |
4560 | ||
4561 | Type* left_type = left_nc->type(); | |
4562 | Type* right_type = right_nc->type(); | |
4563 | ||
4564 | Type* type; | |
4565 | if (!Binary_expression::operation_type(op, left_type, right_type, &type)) | |
4566 | return false; | |
4567 | ||
4568 | bool is_shift = op == OPERATOR_LSHIFT || op == OPERATOR_RSHIFT; | |
4569 | ||
4570 | // When combining an untyped operand with a typed operand, we are | |
4571 | // effectively coercing the untyped operand to the other operand's | |
4572 | // type, so make sure that is valid. | |
4573 | if (!left_nc->set_type(type, true, location)) | |
4574 | return false; | |
4575 | if (!is_shift && !right_nc->set_type(type, true, location)) | |
4576 | return false; | |
4577 | ||
4578 | bool r; | |
4579 | if (type->complex_type() != NULL) | |
4580 | r = Binary_expression::eval_complex(op, left_nc, right_nc, location, nc); | |
4581 | else if (type->float_type() != NULL) | |
4582 | r = Binary_expression::eval_float(op, left_nc, right_nc, location, nc); | |
4583 | else | |
4584 | r = Binary_expression::eval_integer(op, left_nc, right_nc, location, nc); | |
4585 | ||
4586 | if (r) | |
4587 | r = nc->set_type(type, true, location); | |
4588 | ||
4589 | return r; | |
4590 | } | |
4591 | ||
4592 | // Apply binary opcode OP to LEFT_NC and RIGHT_NC, setting NC, using | |
4593 | // integer operations. Return true if this could be done, false if | |
4594 | // not. | |
4595 | ||
4596 | bool | |
4597 | Binary_expression::eval_integer(Operator op, const Numeric_constant* left_nc, | |
4598 | const Numeric_constant* right_nc, | |
4599 | Location location, Numeric_constant* nc) | |
4600 | { | |
4601 | mpz_t left_val; | |
4602 | if (!left_nc->to_int(&left_val)) | |
4603 | return false; | |
4604 | mpz_t right_val; | |
4605 | if (!right_nc->to_int(&right_val)) | |
4606 | { | |
4607 | mpz_clear(left_val); | |
e440a328 | 4608 | return false; |
0c77715b | 4609 | } |
4610 | ||
4611 | mpz_t val; | |
4612 | mpz_init(val); | |
4613 | ||
4614 | switch (op) | |
4615 | { | |
e440a328 | 4616 | case OPERATOR_PLUS: |
4617 | mpz_add(val, left_val, right_val); | |
2c809f8f | 4618 | if (mpz_sizeinbase(val, 2) > 0x100000) |
4619 | { | |
4620 | error_at(location, "constant addition overflow"); | |
4621 | mpz_set_ui(val, 1); | |
4622 | } | |
e440a328 | 4623 | break; |
4624 | case OPERATOR_MINUS: | |
4625 | mpz_sub(val, left_val, right_val); | |
2c809f8f | 4626 | if (mpz_sizeinbase(val, 2) > 0x100000) |
4627 | { | |
4628 | error_at(location, "constant subtraction overflow"); | |
4629 | mpz_set_ui(val, 1); | |
4630 | } | |
e440a328 | 4631 | break; |
4632 | case OPERATOR_OR: | |
4633 | mpz_ior(val, left_val, right_val); | |
4634 | break; | |
4635 | case OPERATOR_XOR: | |
4636 | mpz_xor(val, left_val, right_val); | |
4637 | break; | |
4638 | case OPERATOR_MULT: | |
4639 | mpz_mul(val, left_val, right_val); | |
2c809f8f | 4640 | if (mpz_sizeinbase(val, 2) > 0x100000) |
4641 | { | |
4642 | error_at(location, "constant multiplication overflow"); | |
4643 | mpz_set_ui(val, 1); | |
4644 | } | |
e440a328 | 4645 | break; |
4646 | case OPERATOR_DIV: | |
4647 | if (mpz_sgn(right_val) != 0) | |
4648 | mpz_tdiv_q(val, left_val, right_val); | |
4649 | else | |
4650 | { | |
4651 | error_at(location, "division by zero"); | |
4652 | mpz_set_ui(val, 0); | |
e440a328 | 4653 | } |
4654 | break; | |
4655 | case OPERATOR_MOD: | |
4656 | if (mpz_sgn(right_val) != 0) | |
4657 | mpz_tdiv_r(val, left_val, right_val); | |
4658 | else | |
4659 | { | |
4660 | error_at(location, "division by zero"); | |
4661 | mpz_set_ui(val, 0); | |
e440a328 | 4662 | } |
4663 | break; | |
4664 | case OPERATOR_LSHIFT: | |
4665 | { | |
4666 | unsigned long shift = mpz_get_ui(right_val); | |
0c77715b | 4667 | if (mpz_cmp_ui(right_val, shift) == 0 && shift <= 0x100000) |
4668 | mpz_mul_2exp(val, left_val, shift); | |
4669 | else | |
e440a328 | 4670 | { |
4671 | error_at(location, "shift count overflow"); | |
2c809f8f | 4672 | mpz_set_ui(val, 1); |
e440a328 | 4673 | } |
e440a328 | 4674 | break; |
4675 | } | |
4676 | break; | |
4677 | case OPERATOR_RSHIFT: | |
4678 | { | |
4679 | unsigned long shift = mpz_get_ui(right_val); | |
4680 | if (mpz_cmp_ui(right_val, shift) != 0) | |
4681 | { | |
4682 | error_at(location, "shift count overflow"); | |
2c809f8f | 4683 | mpz_set_ui(val, 1); |
e440a328 | 4684 | } |
e440a328 | 4685 | else |
0c77715b | 4686 | { |
4687 | if (mpz_cmp_ui(left_val, 0) >= 0) | |
4688 | mpz_tdiv_q_2exp(val, left_val, shift); | |
4689 | else | |
4690 | mpz_fdiv_q_2exp(val, left_val, shift); | |
4691 | } | |
e440a328 | 4692 | break; |
4693 | } | |
4694 | break; | |
4695 | case OPERATOR_AND: | |
4696 | mpz_and(val, left_val, right_val); | |
4697 | break; | |
4698 | case OPERATOR_BITCLEAR: | |
4699 | { | |
4700 | mpz_t tval; | |
4701 | mpz_init(tval); | |
4702 | mpz_com(tval, right_val); | |
4703 | mpz_and(val, left_val, tval); | |
4704 | mpz_clear(tval); | |
4705 | } | |
4706 | break; | |
4707 | default: | |
c3e6f413 | 4708 | go_unreachable(); |
e440a328 | 4709 | } |
4710 | ||
0c77715b | 4711 | mpz_clear(left_val); |
4712 | mpz_clear(right_val); | |
e440a328 | 4713 | |
0c77715b | 4714 | if (left_nc->is_rune() |
4715 | || (op != OPERATOR_LSHIFT | |
4716 | && op != OPERATOR_RSHIFT | |
4717 | && right_nc->is_rune())) | |
4718 | nc->set_rune(NULL, val); | |
4719 | else | |
4720 | nc->set_int(NULL, val); | |
4721 | ||
4722 | mpz_clear(val); | |
e440a328 | 4723 | |
4724 | return true; | |
4725 | } | |
4726 | ||
0c77715b | 4727 | // Apply binary opcode OP to LEFT_NC and RIGHT_NC, setting NC, using |
4728 | // floating point operations. Return true if this could be done, | |
4729 | // false if not. | |
e440a328 | 4730 | |
4731 | bool | |
0c77715b | 4732 | Binary_expression::eval_float(Operator op, const Numeric_constant* left_nc, |
4733 | const Numeric_constant* right_nc, | |
4734 | Location location, Numeric_constant* nc) | |
e440a328 | 4735 | { |
0c77715b | 4736 | mpfr_t left_val; |
4737 | if (!left_nc->to_float(&left_val)) | |
4738 | return false; | |
4739 | mpfr_t right_val; | |
4740 | if (!right_nc->to_float(&right_val)) | |
e440a328 | 4741 | { |
0c77715b | 4742 | mpfr_clear(left_val); |
e440a328 | 4743 | return false; |
0c77715b | 4744 | } |
4745 | ||
4746 | mpfr_t val; | |
4747 | mpfr_init(val); | |
4748 | ||
4749 | bool ret = true; | |
4750 | switch (op) | |
4751 | { | |
e440a328 | 4752 | case OPERATOR_PLUS: |
4753 | mpfr_add(val, left_val, right_val, GMP_RNDN); | |
4754 | break; | |
4755 | case OPERATOR_MINUS: | |
4756 | mpfr_sub(val, left_val, right_val, GMP_RNDN); | |
4757 | break; | |
4758 | case OPERATOR_OR: | |
4759 | case OPERATOR_XOR: | |
4760 | case OPERATOR_AND: | |
4761 | case OPERATOR_BITCLEAR: | |
0c77715b | 4762 | case OPERATOR_MOD: |
4763 | case OPERATOR_LSHIFT: | |
4764 | case OPERATOR_RSHIFT: | |
4765 | mpfr_set_ui(val, 0, GMP_RNDN); | |
4766 | ret = false; | |
4767 | break; | |
e440a328 | 4768 | case OPERATOR_MULT: |
4769 | mpfr_mul(val, left_val, right_val, GMP_RNDN); | |
4770 | break; | |
4771 | case OPERATOR_DIV: | |
0c77715b | 4772 | if (!mpfr_zero_p(right_val)) |
4773 | mpfr_div(val, left_val, right_val, GMP_RNDN); | |
4774 | else | |
4775 | { | |
4776 | error_at(location, "division by zero"); | |
4777 | mpfr_set_ui(val, 0, GMP_RNDN); | |
4778 | } | |
e440a328 | 4779 | break; |
e440a328 | 4780 | default: |
c3e6f413 | 4781 | go_unreachable(); |
e440a328 | 4782 | } |
4783 | ||
0c77715b | 4784 | mpfr_clear(left_val); |
4785 | mpfr_clear(right_val); | |
e440a328 | 4786 | |
0c77715b | 4787 | nc->set_float(NULL, val); |
4788 | mpfr_clear(val); | |
e440a328 | 4789 | |
0c77715b | 4790 | return ret; |
e440a328 | 4791 | } |
4792 | ||
0c77715b | 4793 | // Apply binary opcode OP to LEFT_NC and RIGHT_NC, setting NC, using |
4794 | // complex operations. Return true if this could be done, false if | |
4795 | // not. | |
e440a328 | 4796 | |
4797 | bool | |
0c77715b | 4798 | Binary_expression::eval_complex(Operator op, const Numeric_constant* left_nc, |
4799 | const Numeric_constant* right_nc, | |
4800 | Location location, Numeric_constant* nc) | |
e440a328 | 4801 | { |
fcbea5e4 | 4802 | mpc_t left_val; |
4803 | if (!left_nc->to_complex(&left_val)) | |
0c77715b | 4804 | return false; |
fcbea5e4 | 4805 | mpc_t right_val; |
4806 | if (!right_nc->to_complex(&right_val)) | |
e440a328 | 4807 | { |
fcbea5e4 | 4808 | mpc_clear(left_val); |
e440a328 | 4809 | return false; |
0c77715b | 4810 | } |
4811 | ||
fcbea5e4 | 4812 | mpc_t val; |
4813 | mpc_init2(val, mpc_precision); | |
0c77715b | 4814 | |
4815 | bool ret = true; | |
4816 | switch (op) | |
4817 | { | |
e440a328 | 4818 | case OPERATOR_PLUS: |
fcbea5e4 | 4819 | mpc_add(val, left_val, right_val, MPC_RNDNN); |
e440a328 | 4820 | break; |
4821 | case OPERATOR_MINUS: | |
fcbea5e4 | 4822 | mpc_sub(val, left_val, right_val, MPC_RNDNN); |
e440a328 | 4823 | break; |
4824 | case OPERATOR_OR: | |
4825 | case OPERATOR_XOR: | |
4826 | case OPERATOR_AND: | |
4827 | case OPERATOR_BITCLEAR: | |
0c77715b | 4828 | case OPERATOR_MOD: |
4829 | case OPERATOR_LSHIFT: | |
4830 | case OPERATOR_RSHIFT: | |
fcbea5e4 | 4831 | mpc_set_ui(val, 0, MPC_RNDNN); |
0c77715b | 4832 | ret = false; |
4833 | break; | |
e440a328 | 4834 | case OPERATOR_MULT: |
fcbea5e4 | 4835 | mpc_mul(val, left_val, right_val, MPC_RNDNN); |
e440a328 | 4836 | break; |
4837 | case OPERATOR_DIV: | |
fcbea5e4 | 4838 | if (mpc_cmp_si(right_val, 0) == 0) |
4839 | { | |
4840 | error_at(location, "division by zero"); | |
4841 | mpc_set_ui(val, 0, MPC_RNDNN); | |
4842 | break; | |
4843 | } | |
4844 | mpc_div(val, left_val, right_val, MPC_RNDNN); | |
e440a328 | 4845 | break; |
e440a328 | 4846 | default: |
c3e6f413 | 4847 | go_unreachable(); |
e440a328 | 4848 | } |
4849 | ||
fcbea5e4 | 4850 | mpc_clear(left_val); |
4851 | mpc_clear(right_val); | |
e440a328 | 4852 | |
fcbea5e4 | 4853 | nc->set_complex(NULL, val); |
4854 | mpc_clear(val); | |
e440a328 | 4855 | |
0c77715b | 4856 | return ret; |
e440a328 | 4857 | } |
4858 | ||
4859 | // Lower a binary expression. We have to evaluate constant | |
4860 | // expressions now, in order to implement Go's unlimited precision | |
4861 | // constants. | |
4862 | ||
4863 | Expression* | |
e9d3367e | 4864 | Binary_expression::do_lower(Gogo* gogo, Named_object*, |
4865 | Statement_inserter* inserter, int) | |
e440a328 | 4866 | { |
b13c66cd | 4867 | Location location = this->location(); |
e440a328 | 4868 | Operator op = this->op_; |
4869 | Expression* left = this->left_; | |
4870 | Expression* right = this->right_; | |
4871 | ||
4872 | const bool is_comparison = (op == OPERATOR_EQEQ | |
4873 | || op == OPERATOR_NOTEQ | |
4874 | || op == OPERATOR_LT | |
4875 | || op == OPERATOR_LE | |
4876 | || op == OPERATOR_GT | |
4877 | || op == OPERATOR_GE); | |
4878 | ||
0c77715b | 4879 | // Numeric constant expressions. |
e440a328 | 4880 | { |
0c77715b | 4881 | Numeric_constant left_nc; |
4882 | Numeric_constant right_nc; | |
4883 | if (left->numeric_constant_value(&left_nc) | |
4884 | && right->numeric_constant_value(&right_nc)) | |
e440a328 | 4885 | { |
0c77715b | 4886 | if (is_comparison) |
e440a328 | 4887 | { |
0c77715b | 4888 | bool result; |
4889 | if (!Binary_expression::compare_constant(op, &left_nc, | |
4890 | &right_nc, location, | |
4891 | &result)) | |
4892 | return this; | |
e90c9dfc | 4893 | return Expression::make_cast(Type::make_boolean_type(), |
0c77715b | 4894 | Expression::make_boolean(result, |
4895 | location), | |
4896 | location); | |
e440a328 | 4897 | } |
4898 | else | |
4899 | { | |
0c77715b | 4900 | Numeric_constant nc; |
4901 | if (!Binary_expression::eval_constant(op, &left_nc, &right_nc, | |
4902 | location, &nc)) | |
4903 | return this; | |
4904 | return nc.expression(location); | |
e440a328 | 4905 | } |
4906 | } | |
e440a328 | 4907 | } |
4908 | ||
4909 | // String constant expressions. | |
315fa98d | 4910 | if (left->type()->is_string_type() && right->type()->is_string_type()) |
e440a328 | 4911 | { |
4912 | std::string left_string; | |
4913 | std::string right_string; | |
4914 | if (left->string_constant_value(&left_string) | |
4915 | && right->string_constant_value(&right_string)) | |
315fa98d | 4916 | { |
4917 | if (op == OPERATOR_PLUS) | |
4918 | return Expression::make_string(left_string + right_string, | |
4919 | location); | |
4920 | else if (is_comparison) | |
4921 | { | |
4922 | int cmp = left_string.compare(right_string); | |
0c77715b | 4923 | bool r = Binary_expression::cmp_to_bool(op, cmp); |
e90c9dfc | 4924 | return Expression::make_boolean(r, location); |
b40dc774 | 4925 | } |
4926 | } | |
b40dc774 | 4927 | } |
4928 | ||
ceeb12d7 | 4929 | // Lower struct, array, and some interface comparisons. |
e9d3367e | 4930 | if (op == OPERATOR_EQEQ || op == OPERATOR_NOTEQ) |
4931 | { | |
b79832ca | 4932 | if (left->type()->struct_type() != NULL |
4933 | && right->type()->struct_type() != NULL) | |
e9d3367e | 4934 | return this->lower_struct_comparison(gogo, inserter); |
4935 | else if (left->type()->array_type() != NULL | |
b79832ca | 4936 | && !left->type()->is_slice_type() |
4937 | && right->type()->array_type() != NULL | |
4938 | && !right->type()->is_slice_type()) | |
e9d3367e | 4939 | return this->lower_array_comparison(gogo, inserter); |
ceeb12d7 | 4940 | else if ((left->type()->interface_type() != NULL |
4941 | && right->type()->interface_type() == NULL) | |
4942 | || (left->type()->interface_type() == NULL | |
4943 | && right->type()->interface_type() != NULL)) | |
4944 | return this->lower_interface_value_comparison(gogo, inserter); | |
e9d3367e | 4945 | } |
4946 | ||
e440a328 | 4947 | return this; |
4948 | } | |
4949 | ||
e9d3367e | 4950 | // Lower a struct comparison. |
4951 | ||
4952 | Expression* | |
4953 | Binary_expression::lower_struct_comparison(Gogo* gogo, | |
4954 | Statement_inserter* inserter) | |
4955 | { | |
4956 | Struct_type* st = this->left_->type()->struct_type(); | |
4957 | Struct_type* st2 = this->right_->type()->struct_type(); | |
4958 | if (st2 == NULL) | |
4959 | return this; | |
4960 | if (st != st2 && !Type::are_identical(st, st2, false, NULL)) | |
4961 | return this; | |
4962 | if (!Type::are_compatible_for_comparison(true, this->left_->type(), | |
4963 | this->right_->type(), NULL)) | |
4964 | return this; | |
4965 | ||
4966 | // See if we can compare using memcmp. As a heuristic, we use | |
4967 | // memcmp rather than field references and comparisons if there are | |
4968 | // more than two fields. | |
113ef6a5 | 4969 | if (st->compare_is_identity(gogo) && st->total_field_count() > 2) |
e9d3367e | 4970 | return this->lower_compare_to_memcmp(gogo, inserter); |
4971 | ||
4972 | Location loc = this->location(); | |
4973 | ||
4974 | Expression* left = this->left_; | |
4975 | Temporary_statement* left_temp = NULL; | |
4976 | if (left->var_expression() == NULL | |
4977 | && left->temporary_reference_expression() == NULL) | |
4978 | { | |
4979 | left_temp = Statement::make_temporary(left->type(), NULL, loc); | |
4980 | inserter->insert(left_temp); | |
4981 | left = Expression::make_set_and_use_temporary(left_temp, left, loc); | |
4982 | } | |
4983 | ||
4984 | Expression* right = this->right_; | |
4985 | Temporary_statement* right_temp = NULL; | |
4986 | if (right->var_expression() == NULL | |
4987 | && right->temporary_reference_expression() == NULL) | |
4988 | { | |
4989 | right_temp = Statement::make_temporary(right->type(), NULL, loc); | |
4990 | inserter->insert(right_temp); | |
4991 | right = Expression::make_set_and_use_temporary(right_temp, right, loc); | |
4992 | } | |
4993 | ||
4994 | Expression* ret = Expression::make_boolean(true, loc); | |
4995 | const Struct_field_list* fields = st->fields(); | |
4996 | unsigned int field_index = 0; | |
4997 | for (Struct_field_list::const_iterator pf = fields->begin(); | |
4998 | pf != fields->end(); | |
4999 | ++pf, ++field_index) | |
5000 | { | |
f5165c05 | 5001 | if (Gogo::is_sink_name(pf->field_name())) |
5002 | continue; | |
5003 | ||
e9d3367e | 5004 | if (field_index > 0) |
5005 | { | |
5006 | if (left_temp == NULL) | |
5007 | left = left->copy(); | |
5008 | else | |
5009 | left = Expression::make_temporary_reference(left_temp, loc); | |
5010 | if (right_temp == NULL) | |
5011 | right = right->copy(); | |
5012 | else | |
5013 | right = Expression::make_temporary_reference(right_temp, loc); | |
5014 | } | |
5015 | Expression* f1 = Expression::make_field_reference(left, field_index, | |
5016 | loc); | |
5017 | Expression* f2 = Expression::make_field_reference(right, field_index, | |
5018 | loc); | |
5019 | Expression* cond = Expression::make_binary(OPERATOR_EQEQ, f1, f2, loc); | |
5020 | ret = Expression::make_binary(OPERATOR_ANDAND, ret, cond, loc); | |
5021 | } | |
5022 | ||
5023 | if (this->op_ == OPERATOR_NOTEQ) | |
5024 | ret = Expression::make_unary(OPERATOR_NOT, ret, loc); | |
5025 | ||
5026 | return ret; | |
5027 | } | |
5028 | ||
5029 | // Lower an array comparison. | |
5030 | ||
5031 | Expression* | |
5032 | Binary_expression::lower_array_comparison(Gogo* gogo, | |
5033 | Statement_inserter* inserter) | |
5034 | { | |
5035 | Array_type* at = this->left_->type()->array_type(); | |
5036 | Array_type* at2 = this->right_->type()->array_type(); | |
5037 | if (at2 == NULL) | |
5038 | return this; | |
5039 | if (at != at2 && !Type::are_identical(at, at2, false, NULL)) | |
5040 | return this; | |
5041 | if (!Type::are_compatible_for_comparison(true, this->left_->type(), | |
5042 | this->right_->type(), NULL)) | |
5043 | return this; | |
5044 | ||
5045 | // Call memcmp directly if possible. This may let the middle-end | |
5046 | // optimize the call. | |
113ef6a5 | 5047 | if (at->compare_is_identity(gogo)) |
e9d3367e | 5048 | return this->lower_compare_to_memcmp(gogo, inserter); |
5049 | ||
5050 | // Call the array comparison function. | |
5051 | Named_object* hash_fn; | |
5052 | Named_object* equal_fn; | |
5053 | at->type_functions(gogo, this->left_->type()->named_type(), NULL, NULL, | |
5054 | &hash_fn, &equal_fn); | |
5055 | ||
5056 | Location loc = this->location(); | |
5057 | ||
5058 | Expression* func = Expression::make_func_reference(equal_fn, NULL, loc); | |
5059 | ||
5060 | Expression_list* args = new Expression_list(); | |
5061 | args->push_back(this->operand_address(inserter, this->left_)); | |
5062 | args->push_back(this->operand_address(inserter, this->right_)); | |
5063 | args->push_back(Expression::make_type_info(at, TYPE_INFO_SIZE)); | |
5064 | ||
5065 | Expression* ret = Expression::make_call(func, args, false, loc); | |
5066 | ||
5067 | if (this->op_ == OPERATOR_NOTEQ) | |
5068 | ret = Expression::make_unary(OPERATOR_NOT, ret, loc); | |
5069 | ||
5070 | return ret; | |
5071 | } | |
5072 | ||
ceeb12d7 | 5073 | // Lower an interface to value comparison. |
5074 | ||
5075 | Expression* | |
5076 | Binary_expression::lower_interface_value_comparison(Gogo*, | |
5077 | Statement_inserter* inserter) | |
5078 | { | |
5079 | Type* left_type = this->left_->type(); | |
5080 | Type* right_type = this->right_->type(); | |
5081 | Interface_type* ift; | |
5082 | if (left_type->interface_type() != NULL) | |
5083 | { | |
5084 | ift = left_type->interface_type(); | |
5085 | if (!ift->implements_interface(right_type, NULL)) | |
5086 | return this; | |
5087 | } | |
5088 | else | |
5089 | { | |
5090 | ift = right_type->interface_type(); | |
5091 | if (!ift->implements_interface(left_type, NULL)) | |
5092 | return this; | |
5093 | } | |
5094 | if (!Type::are_compatible_for_comparison(true, left_type, right_type, NULL)) | |
5095 | return this; | |
5096 | ||
5097 | Location loc = this->location(); | |
5098 | ||
5099 | if (left_type->interface_type() == NULL | |
5100 | && left_type->points_to() == NULL | |
5101 | && !this->left_->is_addressable()) | |
5102 | { | |
5103 | Temporary_statement* temp = | |
5104 | Statement::make_temporary(left_type, NULL, loc); | |
5105 | inserter->insert(temp); | |
5106 | this->left_ = | |
5107 | Expression::make_set_and_use_temporary(temp, this->left_, loc); | |
5108 | } | |
5109 | ||
5110 | if (right_type->interface_type() == NULL | |
5111 | && right_type->points_to() == NULL | |
5112 | && !this->right_->is_addressable()) | |
5113 | { | |
5114 | Temporary_statement* temp = | |
5115 | Statement::make_temporary(right_type, NULL, loc); | |
5116 | inserter->insert(temp); | |
5117 | this->right_ = | |
5118 | Expression::make_set_and_use_temporary(temp, this->right_, loc); | |
5119 | } | |
5120 | ||
5121 | return this; | |
5122 | } | |
5123 | ||
e9d3367e | 5124 | // Lower a struct or array comparison to a call to memcmp. |
5125 | ||
5126 | Expression* | |
5127 | Binary_expression::lower_compare_to_memcmp(Gogo*, Statement_inserter* inserter) | |
5128 | { | |
5129 | Location loc = this->location(); | |
5130 | ||
5131 | Expression* a1 = this->operand_address(inserter, this->left_); | |
5132 | Expression* a2 = this->operand_address(inserter, this->right_); | |
5133 | Expression* len = Expression::make_type_info(this->left_->type(), | |
5134 | TYPE_INFO_SIZE); | |
5135 | ||
5136 | Expression* call = Runtime::make_call(Runtime::MEMCMP, loc, 3, a1, a2, len); | |
e67508fa | 5137 | Expression* zero = Expression::make_integer_ul(0, NULL, loc); |
e9d3367e | 5138 | return Expression::make_binary(this->op_, call, zero, loc); |
5139 | } | |
5140 | ||
a32698ee | 5141 | Expression* |
5c3f3470 | 5142 | Binary_expression::do_flatten(Gogo* gogo, Named_object*, |
a32698ee | 5143 | Statement_inserter* inserter) |
5144 | { | |
5145 | Location loc = this->location(); | |
5146 | Temporary_statement* temp; | |
5147 | if (this->left_->type()->is_string_type() | |
5148 | && this->op_ == OPERATOR_PLUS) | |
5149 | { | |
5150 | if (!this->left_->is_variable()) | |
5151 | { | |
5152 | temp = Statement::make_temporary(NULL, this->left_, loc); | |
5153 | inserter->insert(temp); | |
5154 | this->left_ = Expression::make_temporary_reference(temp, loc); | |
5155 | } | |
5156 | if (!this->right_->is_variable()) | |
5157 | { | |
5158 | temp = | |
5159 | Statement::make_temporary(this->left_->type(), this->right_, loc); | |
5160 | this->right_ = Expression::make_temporary_reference(temp, loc); | |
5161 | inserter->insert(temp); | |
5162 | } | |
5163 | } | |
5164 | ||
5165 | Type* left_type = this->left_->type(); | |
5166 | bool is_shift_op = (this->op_ == OPERATOR_LSHIFT | |
5167 | || this->op_ == OPERATOR_RSHIFT); | |
5168 | bool is_idiv_op = ((this->op_ == OPERATOR_DIV && | |
5169 | left_type->integer_type() != NULL) | |
5170 | || this->op_ == OPERATOR_MOD); | |
5171 | ||
a32698ee | 5172 | if (is_shift_op |
5c3f3470 | 5173 | || (is_idiv_op |
5174 | && (gogo->check_divide_by_zero() || gogo->check_divide_overflow()))) | |
a32698ee | 5175 | { |
5176 | if (!this->left_->is_variable()) | |
5177 | { | |
5178 | temp = Statement::make_temporary(NULL, this->left_, loc); | |
5179 | inserter->insert(temp); | |
5180 | this->left_ = Expression::make_temporary_reference(temp, loc); | |
5181 | } | |
5182 | if (!this->right_->is_variable()) | |
5183 | { | |
5184 | temp = | |
5185 | Statement::make_temporary(NULL, this->right_, loc); | |
5186 | this->right_ = Expression::make_temporary_reference(temp, loc); | |
5187 | inserter->insert(temp); | |
5188 | } | |
5189 | } | |
5190 | return this; | |
5191 | } | |
5192 | ||
5193 | ||
e9d3367e | 5194 | // Return the address of EXPR, cast to unsafe.Pointer. |
5195 | ||
5196 | Expression* | |
5197 | Binary_expression::operand_address(Statement_inserter* inserter, | |
5198 | Expression* expr) | |
5199 | { | |
5200 | Location loc = this->location(); | |
5201 | ||
5202 | if (!expr->is_addressable()) | |
5203 | { | |
5204 | Temporary_statement* temp = Statement::make_temporary(expr->type(), NULL, | |
5205 | loc); | |
5206 | inserter->insert(temp); | |
5207 | expr = Expression::make_set_and_use_temporary(temp, expr, loc); | |
5208 | } | |
5209 | expr = Expression::make_unary(OPERATOR_AND, expr, loc); | |
5210 | static_cast<Unary_expression*>(expr)->set_does_not_escape(); | |
5211 | Type* void_type = Type::make_void_type(); | |
5212 | Type* unsafe_pointer_type = Type::make_pointer_type(void_type); | |
5213 | return Expression::make_cast(unsafe_pointer_type, expr, loc); | |
5214 | } | |
5215 | ||
0c77715b | 5216 | // Return the numeric constant value, if it has one. |
e440a328 | 5217 | |
5218 | bool | |
0c77715b | 5219 | Binary_expression::do_numeric_constant_value(Numeric_constant* nc) const |
e440a328 | 5220 | { |
0c77715b | 5221 | Numeric_constant left_nc; |
5222 | if (!this->left_->numeric_constant_value(&left_nc)) | |
5223 | return false; | |
5224 | Numeric_constant right_nc; | |
5225 | if (!this->right_->numeric_constant_value(&right_nc)) | |
5226 | return false; | |
9767e2d3 | 5227 | return Binary_expression::eval_constant(this->op_, &left_nc, &right_nc, |
0c77715b | 5228 | this->location(), nc); |
e440a328 | 5229 | } |
5230 | ||
5231 | // Note that the value is being discarded. | |
5232 | ||
4f2138d7 | 5233 | bool |
e440a328 | 5234 | Binary_expression::do_discarding_value() |
5235 | { | |
5236 | if (this->op_ == OPERATOR_OROR || this->op_ == OPERATOR_ANDAND) | |
4f2138d7 | 5237 | return this->right_->discarding_value(); |
e440a328 | 5238 | else |
4f2138d7 | 5239 | { |
5240 | this->unused_value_error(); | |
5241 | return false; | |
5242 | } | |
e440a328 | 5243 | } |
5244 | ||
5245 | // Get type. | |
5246 | ||
5247 | Type* | |
5248 | Binary_expression::do_type() | |
5249 | { | |
5f5fea79 | 5250 | if (this->classification() == EXPRESSION_ERROR) |
5251 | return Type::make_error_type(); | |
5252 | ||
e440a328 | 5253 | switch (this->op_) |
5254 | { | |
e440a328 | 5255 | case OPERATOR_EQEQ: |
5256 | case OPERATOR_NOTEQ: | |
5257 | case OPERATOR_LT: | |
5258 | case OPERATOR_LE: | |
5259 | case OPERATOR_GT: | |
5260 | case OPERATOR_GE: | |
e90c9dfc | 5261 | if (this->type_ == NULL) |
5262 | this->type_ = Type::make_boolean_type(); | |
5263 | return this->type_; | |
e440a328 | 5264 | |
5265 | case OPERATOR_PLUS: | |
5266 | case OPERATOR_MINUS: | |
5267 | case OPERATOR_OR: | |
5268 | case OPERATOR_XOR: | |
5269 | case OPERATOR_MULT: | |
5270 | case OPERATOR_DIV: | |
5271 | case OPERATOR_MOD: | |
5272 | case OPERATOR_AND: | |
5273 | case OPERATOR_BITCLEAR: | |
e90c9dfc | 5274 | case OPERATOR_OROR: |
5275 | case OPERATOR_ANDAND: | |
e440a328 | 5276 | { |
0c77715b | 5277 | Type* type; |
5278 | if (!Binary_expression::operation_type(this->op_, | |
5279 | this->left_->type(), | |
5280 | this->right_->type(), | |
5281 | &type)) | |
5282 | return Type::make_error_type(); | |
5283 | return type; | |
e440a328 | 5284 | } |
5285 | ||
5286 | case OPERATOR_LSHIFT: | |
5287 | case OPERATOR_RSHIFT: | |
5288 | return this->left_->type(); | |
5289 | ||
5290 | default: | |
c3e6f413 | 5291 | go_unreachable(); |
e440a328 | 5292 | } |
5293 | } | |
5294 | ||
5295 | // Set type for a binary expression. | |
5296 | ||
5297 | void | |
5298 | Binary_expression::do_determine_type(const Type_context* context) | |
5299 | { | |
5300 | Type* tleft = this->left_->type(); | |
5301 | Type* tright = this->right_->type(); | |
5302 | ||
5303 | // Both sides should have the same type, except for the shift | |
5304 | // operations. For a comparison, we should ignore the incoming | |
5305 | // type. | |
5306 | ||
5307 | bool is_shift_op = (this->op_ == OPERATOR_LSHIFT | |
5308 | || this->op_ == OPERATOR_RSHIFT); | |
5309 | ||
5310 | bool is_comparison = (this->op_ == OPERATOR_EQEQ | |
5311 | || this->op_ == OPERATOR_NOTEQ | |
5312 | || this->op_ == OPERATOR_LT | |
5313 | || this->op_ == OPERATOR_LE | |
5314 | || this->op_ == OPERATOR_GT | |
5315 | || this->op_ == OPERATOR_GE); | |
5316 | ||
5317 | Type_context subcontext(*context); | |
5318 | ||
5319 | if (is_comparison) | |
5320 | { | |
5321 | // In a comparison, the context does not determine the types of | |
5322 | // the operands. | |
5323 | subcontext.type = NULL; | |
5324 | } | |
5325 | ||
5326 | // Set the context for the left hand operand. | |
5327 | if (is_shift_op) | |
5328 | { | |
b40dc774 | 5329 | // The right hand operand of a shift plays no role in |
5330 | // determining the type of the left hand operand. | |
e440a328 | 5331 | } |
5332 | else if (!tleft->is_abstract()) | |
5333 | subcontext.type = tleft; | |
5334 | else if (!tright->is_abstract()) | |
5335 | subcontext.type = tright; | |
5336 | else if (subcontext.type == NULL) | |
5337 | { | |
5338 | if ((tleft->integer_type() != NULL && tright->integer_type() != NULL) | |
5339 | || (tleft->float_type() != NULL && tright->float_type() != NULL) | |
5340 | || (tleft->complex_type() != NULL && tright->complex_type() != NULL)) | |
5341 | { | |
5342 | // Both sides have an abstract integer, abstract float, or | |
5343 | // abstract complex type. Just let CONTEXT determine | |
5344 | // whether they may remain abstract or not. | |
5345 | } | |
5346 | else if (tleft->complex_type() != NULL) | |
5347 | subcontext.type = tleft; | |
5348 | else if (tright->complex_type() != NULL) | |
5349 | subcontext.type = tright; | |
5350 | else if (tleft->float_type() != NULL) | |
5351 | subcontext.type = tleft; | |
5352 | else if (tright->float_type() != NULL) | |
5353 | subcontext.type = tright; | |
5354 | else | |
5355 | subcontext.type = tleft; | |
f58a23ae | 5356 | |
5357 | if (subcontext.type != NULL && !context->may_be_abstract) | |
5358 | subcontext.type = subcontext.type->make_non_abstract_type(); | |
e440a328 | 5359 | } |
5360 | ||
5361 | this->left_->determine_type(&subcontext); | |
5362 | ||
e440a328 | 5363 | if (is_shift_op) |
5364 | { | |
b40dc774 | 5365 | // We may have inherited an unusable type for the shift operand. |
5366 | // Give a useful error if that happened. | |
5367 | if (tleft->is_abstract() | |
5368 | && subcontext.type != NULL | |
8ab6effb | 5369 | && !subcontext.may_be_abstract |
f6bc81e6 | 5370 | && subcontext.type->interface_type() == NULL |
8ab6effb | 5371 | && subcontext.type->integer_type() == NULL) |
b40dc774 | 5372 | this->report_error(("invalid context-determined non-integer type " |
8ab6effb | 5373 | "for left operand of shift")); |
b40dc774 | 5374 | |
5375 | // The context for the right hand operand is the same as for the | |
5376 | // left hand operand, except for a shift operator. | |
e440a328 | 5377 | subcontext.type = Type::lookup_integer_type("uint"); |
5378 | subcontext.may_be_abstract = false; | |
5379 | } | |
5380 | ||
5381 | this->right_->determine_type(&subcontext); | |
e90c9dfc | 5382 | |
5383 | if (is_comparison) | |
5384 | { | |
5385 | if (this->type_ != NULL && !this->type_->is_abstract()) | |
5386 | ; | |
5387 | else if (context->type != NULL && context->type->is_boolean_type()) | |
5388 | this->type_ = context->type; | |
5389 | else if (!context->may_be_abstract) | |
5390 | this->type_ = Type::lookup_bool_type(); | |
5391 | } | |
e440a328 | 5392 | } |
5393 | ||
5394 | // Report an error if the binary operator OP does not support TYPE. | |
be8b5eee | 5395 | // OTYPE is the type of the other operand. Return whether the |
5396 | // operation is OK. This should not be used for shift. | |
e440a328 | 5397 | |
5398 | bool | |
be8b5eee | 5399 | Binary_expression::check_operator_type(Operator op, Type* type, Type* otype, |
b13c66cd | 5400 | Location location) |
e440a328 | 5401 | { |
5402 | switch (op) | |
5403 | { | |
5404 | case OPERATOR_OROR: | |
5405 | case OPERATOR_ANDAND: | |
5406 | if (!type->is_boolean_type()) | |
5407 | { | |
5408 | error_at(location, "expected boolean type"); | |
5409 | return false; | |
5410 | } | |
5411 | break; | |
5412 | ||
5413 | case OPERATOR_EQEQ: | |
5414 | case OPERATOR_NOTEQ: | |
e9d3367e | 5415 | { |
5416 | std::string reason; | |
5417 | if (!Type::are_compatible_for_comparison(true, type, otype, &reason)) | |
5418 | { | |
5419 | error_at(location, "%s", reason.c_str()); | |
5420 | return false; | |
5421 | } | |
5422 | } | |
e440a328 | 5423 | break; |
5424 | ||
5425 | case OPERATOR_LT: | |
5426 | case OPERATOR_LE: | |
5427 | case OPERATOR_GT: | |
5428 | case OPERATOR_GE: | |
e9d3367e | 5429 | { |
5430 | std::string reason; | |
5431 | if (!Type::are_compatible_for_comparison(false, type, otype, &reason)) | |
5432 | { | |
5433 | error_at(location, "%s", reason.c_str()); | |
5434 | return false; | |
5435 | } | |
5436 | } | |
e440a328 | 5437 | break; |
5438 | ||
5439 | case OPERATOR_PLUS: | |
5440 | case OPERATOR_PLUSEQ: | |
5441 | if (type->integer_type() == NULL | |
5442 | && type->float_type() == NULL | |
5443 | && type->complex_type() == NULL | |
5444 | && !type->is_string_type()) | |
5445 | { | |
5446 | error_at(location, | |
5447 | "expected integer, floating, complex, or string type"); | |
5448 | return false; | |
5449 | } | |
5450 | break; | |
5451 | ||
5452 | case OPERATOR_MINUS: | |
5453 | case OPERATOR_MINUSEQ: | |
5454 | case OPERATOR_MULT: | |
5455 | case OPERATOR_MULTEQ: | |
5456 | case OPERATOR_DIV: | |
5457 | case OPERATOR_DIVEQ: | |
5458 | if (type->integer_type() == NULL | |
5459 | && type->float_type() == NULL | |
5460 | && type->complex_type() == NULL) | |
5461 | { | |
5462 | error_at(location, "expected integer, floating, or complex type"); | |
5463 | return false; | |
5464 | } | |
5465 | break; | |
5466 | ||
5467 | case OPERATOR_MOD: | |
5468 | case OPERATOR_MODEQ: | |
5469 | case OPERATOR_OR: | |
5470 | case OPERATOR_OREQ: | |
5471 | case OPERATOR_AND: | |
5472 | case OPERATOR_ANDEQ: | |
5473 | case OPERATOR_XOR: | |
5474 | case OPERATOR_XOREQ: | |
5475 | case OPERATOR_BITCLEAR: | |
5476 | case OPERATOR_BITCLEAREQ: | |
5477 | if (type->integer_type() == NULL) | |
5478 | { | |
5479 | error_at(location, "expected integer type"); | |
5480 | return false; | |
5481 | } | |
5482 | break; | |
5483 | ||
5484 | default: | |
c3e6f413 | 5485 | go_unreachable(); |
e440a328 | 5486 | } |
5487 | ||
5488 | return true; | |
5489 | } | |
5490 | ||
5491 | // Check types. | |
5492 | ||
5493 | void | |
5494 | Binary_expression::do_check_types(Gogo*) | |
5495 | { | |
5f5fea79 | 5496 | if (this->classification() == EXPRESSION_ERROR) |
5497 | return; | |
5498 | ||
e440a328 | 5499 | Type* left_type = this->left_->type(); |
5500 | Type* right_type = this->right_->type(); | |
5c13bd80 | 5501 | if (left_type->is_error() || right_type->is_error()) |
9fe897ef | 5502 | { |
5503 | this->set_is_error(); | |
5504 | return; | |
5505 | } | |
e440a328 | 5506 | |
5507 | if (this->op_ == OPERATOR_EQEQ | |
5508 | || this->op_ == OPERATOR_NOTEQ | |
5509 | || this->op_ == OPERATOR_LT | |
5510 | || this->op_ == OPERATOR_LE | |
5511 | || this->op_ == OPERATOR_GT | |
5512 | || this->op_ == OPERATOR_GE) | |
5513 | { | |
907c5ecd | 5514 | if (left_type->is_nil_type() && right_type->is_nil_type()) |
5515 | { | |
5516 | this->report_error(_("invalid comparison of nil with nil")); | |
5517 | return; | |
5518 | } | |
e440a328 | 5519 | if (!Type::are_assignable(left_type, right_type, NULL) |
5520 | && !Type::are_assignable(right_type, left_type, NULL)) | |
5521 | { | |
5522 | this->report_error(_("incompatible types in binary expression")); | |
5523 | return; | |
5524 | } | |
5525 | if (!Binary_expression::check_operator_type(this->op_, left_type, | |
be8b5eee | 5526 | right_type, |
e440a328 | 5527 | this->location()) |
5528 | || !Binary_expression::check_operator_type(this->op_, right_type, | |
be8b5eee | 5529 | left_type, |
e440a328 | 5530 | this->location())) |
5531 | { | |
5532 | this->set_is_error(); | |
5533 | return; | |
5534 | } | |
5535 | } | |
5536 | else if (this->op_ != OPERATOR_LSHIFT && this->op_ != OPERATOR_RSHIFT) | |
5537 | { | |
5538 | if (!Type::are_compatible_for_binop(left_type, right_type)) | |
5539 | { | |
5540 | this->report_error(_("incompatible types in binary expression")); | |
5541 | return; | |
5542 | } | |
5543 | if (!Binary_expression::check_operator_type(this->op_, left_type, | |
be8b5eee | 5544 | right_type, |
e440a328 | 5545 | this->location())) |
5546 | { | |
5547 | this->set_is_error(); | |
5548 | return; | |
5549 | } | |
5c65b19d | 5550 | if (this->op_ == OPERATOR_DIV || this->op_ == OPERATOR_MOD) |
5551 | { | |
5552 | // Division by a zero integer constant is an error. | |
5553 | Numeric_constant rconst; | |
5554 | unsigned long rval; | |
5555 | if (left_type->integer_type() != NULL | |
5556 | && this->right_->numeric_constant_value(&rconst) | |
5557 | && rconst.to_unsigned_long(&rval) == Numeric_constant::NC_UL_VALID | |
5558 | && rval == 0) | |
5559 | { | |
5560 | this->report_error(_("integer division by zero")); | |
5561 | return; | |
5562 | } | |
5563 | } | |
e440a328 | 5564 | } |
5565 | else | |
5566 | { | |
5567 | if (left_type->integer_type() == NULL) | |
5568 | this->report_error(_("shift of non-integer operand")); | |
5569 | ||
5570 | if (!right_type->is_abstract() | |
5571 | && (right_type->integer_type() == NULL | |
5572 | || !right_type->integer_type()->is_unsigned())) | |
5573 | this->report_error(_("shift count not unsigned integer")); | |
5574 | else | |
5575 | { | |
0c77715b | 5576 | Numeric_constant nc; |
5577 | if (this->right_->numeric_constant_value(&nc)) | |
e440a328 | 5578 | { |
0c77715b | 5579 | mpz_t val; |
5580 | if (!nc.to_int(&val)) | |
5581 | this->report_error(_("shift count not unsigned integer")); | |
5582 | else | |
a4eba91b | 5583 | { |
0c77715b | 5584 | if (mpz_sgn(val) < 0) |
5585 | { | |
5586 | this->report_error(_("negative shift count")); | |
0c77715b | 5587 | Location rloc = this->right_->location(); |
e67508fa | 5588 | this->right_ = Expression::make_integer_ul(0, right_type, |
5589 | rloc); | |
0c77715b | 5590 | } |
5591 | mpz_clear(val); | |
a4eba91b | 5592 | } |
e440a328 | 5593 | } |
e440a328 | 5594 | } |
5595 | } | |
5596 | } | |
5597 | ||
ea664253 | 5598 | // Get the backend representation for a binary expression. |
e440a328 | 5599 | |
ea664253 | 5600 | Bexpression* |
5601 | Binary_expression::do_get_backend(Translate_context* context) | |
e440a328 | 5602 | { |
1b1f2abf | 5603 | Gogo* gogo = context->gogo(); |
a32698ee | 5604 | Location loc = this->location(); |
5605 | Type* left_type = this->left_->type(); | |
5606 | Type* right_type = this->right_->type(); | |
1b1f2abf | 5607 | |
e440a328 | 5608 | bool use_left_type = true; |
5609 | bool is_shift_op = false; | |
29a2d1d8 | 5610 | bool is_idiv_op = false; |
e440a328 | 5611 | switch (this->op_) |
5612 | { | |
5613 | case OPERATOR_EQEQ: | |
5614 | case OPERATOR_NOTEQ: | |
5615 | case OPERATOR_LT: | |
5616 | case OPERATOR_LE: | |
5617 | case OPERATOR_GT: | |
5618 | case OPERATOR_GE: | |
ea664253 | 5619 | return Expression::comparison(context, this->type_, this->op_, |
5620 | this->left_, this->right_, loc); | |
e440a328 | 5621 | |
5622 | case OPERATOR_OROR: | |
e440a328 | 5623 | case OPERATOR_ANDAND: |
e440a328 | 5624 | use_left_type = false; |
5625 | break; | |
5626 | case OPERATOR_PLUS: | |
e440a328 | 5627 | case OPERATOR_MINUS: |
e440a328 | 5628 | case OPERATOR_OR: |
e440a328 | 5629 | case OPERATOR_XOR: |
e440a328 | 5630 | case OPERATOR_MULT: |
e440a328 | 5631 | break; |
5632 | case OPERATOR_DIV: | |
a32698ee | 5633 | if (left_type->float_type() != NULL || left_type->complex_type() != NULL) |
5634 | break; | |
e440a328 | 5635 | case OPERATOR_MOD: |
29a2d1d8 | 5636 | is_idiv_op = true; |
e440a328 | 5637 | break; |
5638 | case OPERATOR_LSHIFT: | |
e440a328 | 5639 | case OPERATOR_RSHIFT: |
e440a328 | 5640 | is_shift_op = true; |
5641 | break; | |
e440a328 | 5642 | case OPERATOR_BITCLEAR: |
a32698ee | 5643 | this->right_ = Expression::make_unary(OPERATOR_XOR, this->right_, loc); |
5644 | case OPERATOR_AND: | |
e440a328 | 5645 | break; |
5646 | default: | |
c3e6f413 | 5647 | go_unreachable(); |
e440a328 | 5648 | } |
5649 | ||
a32698ee | 5650 | if (left_type->is_string_type()) |
e440a328 | 5651 | { |
c484d925 | 5652 | go_assert(this->op_ == OPERATOR_PLUS); |
a32698ee | 5653 | Expression* string_plus = |
5654 | Runtime::make_call(Runtime::STRING_PLUS, loc, 2, | |
5655 | this->left_, this->right_); | |
ea664253 | 5656 | return string_plus->get_backend(context); |
a32698ee | 5657 | } |
5658 | ||
5659 | // For complex division Go might want slightly different results than the | |
5660 | // backend implementation provides, so we have our own runtime routine. | |
1850e20c | 5661 | if (this->op_ == OPERATOR_DIV && this->left_->type()->complex_type() != NULL) |
5662 | { | |
a32698ee | 5663 | Runtime::Function complex_code; |
1850e20c | 5664 | switch (this->left_->type()->complex_type()->bits()) |
5665 | { | |
5666 | case 64: | |
a32698ee | 5667 | complex_code = Runtime::COMPLEX64_DIV; |
1850e20c | 5668 | break; |
5669 | case 128: | |
a32698ee | 5670 | complex_code = Runtime::COMPLEX128_DIV; |
1850e20c | 5671 | break; |
5672 | default: | |
5673 | go_unreachable(); | |
5674 | } | |
a32698ee | 5675 | Expression* complex_div = |
5676 | Runtime::make_call(complex_code, loc, 2, this->left_, this->right_); | |
ea664253 | 5677 | return complex_div->get_backend(context); |
1850e20c | 5678 | } |
5679 | ||
ea664253 | 5680 | Bexpression* left = this->left_->get_backend(context); |
5681 | Bexpression* right = this->right_->get_backend(context); | |
e440a328 | 5682 | |
a32698ee | 5683 | Type* type = use_left_type ? left_type : right_type; |
5684 | Btype* btype = type->get_backend(gogo); | |
5685 | ||
5686 | Bexpression* ret = | |
5687 | gogo->backend()->binary_expression(this->op_, left, right, loc); | |
5688 | ret = gogo->backend()->convert_expression(btype, ret, loc); | |
e440a328 | 5689 | |
a32698ee | 5690 | // Initialize overflow constants. |
5691 | Bexpression* overflow; | |
5692 | mpz_t zero; | |
5693 | mpz_init_set_ui(zero, 0UL); | |
5694 | mpz_t one; | |
5695 | mpz_init_set_ui(one, 1UL); | |
5696 | mpz_t neg_one; | |
5697 | mpz_init_set_si(neg_one, -1); | |
e440a328 | 5698 | |
a32698ee | 5699 | Btype* left_btype = left_type->get_backend(gogo); |
5700 | Btype* right_btype = right_type->get_backend(gogo); | |
e440a328 | 5701 | |
5702 | // In Go, a shift larger than the size of the type is well-defined. | |
a32698ee | 5703 | // This is not true in C, so we need to insert a conditional. |
e440a328 | 5704 | if (is_shift_op) |
5705 | { | |
a32698ee | 5706 | go_assert(left_type->integer_type() != NULL); |
e440a328 | 5707 | |
a32698ee | 5708 | mpz_t bitsval; |
5709 | int bits = left_type->integer_type()->bits(); | |
5710 | mpz_init_set_ui(bitsval, bits); | |
5711 | Bexpression* bits_expr = | |
5712 | gogo->backend()->integer_constant_expression(right_btype, bitsval); | |
5713 | Bexpression* compare = | |
5714 | gogo->backend()->binary_expression(OPERATOR_LT, | |
5715 | right, bits_expr, loc); | |
e440a328 | 5716 | |
a32698ee | 5717 | Bexpression* zero_expr = |
5718 | gogo->backend()->integer_constant_expression(left_btype, zero); | |
5719 | overflow = zero_expr; | |
e440a328 | 5720 | if (this->op_ == OPERATOR_RSHIFT |
a32698ee | 5721 | && !left_type->integer_type()->is_unsigned()) |
e440a328 | 5722 | { |
a32698ee | 5723 | Bexpression* neg_expr = |
5724 | gogo->backend()->binary_expression(OPERATOR_LT, left, | |
5725 | zero_expr, loc); | |
5726 | Bexpression* neg_one_expr = | |
5727 | gogo->backend()->integer_constant_expression(left_btype, neg_one); | |
5728 | overflow = gogo->backend()->conditional_expression(btype, neg_expr, | |
5729 | neg_one_expr, | |
5730 | zero_expr, loc); | |
29a2d1d8 | 5731 | } |
a32698ee | 5732 | ret = gogo->backend()->conditional_expression(btype, compare, ret, |
5733 | overflow, loc); | |
5734 | mpz_clear(bitsval); | |
29a2d1d8 | 5735 | } |
5736 | ||
5737 | // Add checks for division by zero and division overflow as needed. | |
5738 | if (is_idiv_op) | |
5739 | { | |
5c3f3470 | 5740 | if (gogo->check_divide_by_zero()) |
29a2d1d8 | 5741 | { |
5742 | // right == 0 | |
a32698ee | 5743 | Bexpression* zero_expr = |
5744 | gogo->backend()->integer_constant_expression(right_btype, zero); | |
5745 | Bexpression* check = | |
5746 | gogo->backend()->binary_expression(OPERATOR_EQEQ, | |
5747 | right, zero_expr, loc); | |
29a2d1d8 | 5748 | |
a32698ee | 5749 | // __go_runtime_error(RUNTIME_ERROR_DIVISION_BY_ZERO) |
29a2d1d8 | 5750 | int errcode = RUNTIME_ERROR_DIVISION_BY_ZERO; |
ea664253 | 5751 | Bexpression* crash = gogo->runtime_error(errcode, |
5752 | loc)->get_backend(context); | |
29a2d1d8 | 5753 | |
5754 | // right == 0 ? (__go_runtime_error(...), 0) : ret | |
ea664253 | 5755 | ret = gogo->backend()->conditional_expression(btype, check, crash, |
5756 | ret, loc); | |
b13c66cd | 5757 | } |
5758 | ||
5c3f3470 | 5759 | if (gogo->check_divide_overflow()) |
29a2d1d8 | 5760 | { |
5761 | // right == -1 | |
5762 | // FIXME: It would be nice to say that this test is expected | |
5763 | // to return false. | |
a32698ee | 5764 | |
5765 | Bexpression* neg_one_expr = | |
5766 | gogo->backend()->integer_constant_expression(right_btype, neg_one); | |
5767 | Bexpression* check = | |
5768 | gogo->backend()->binary_expression(OPERATOR_EQEQ, | |
5769 | right, neg_one_expr, loc); | |
5770 | ||
5771 | Bexpression* zero_expr = | |
5772 | gogo->backend()->integer_constant_expression(btype, zero); | |
5773 | Bexpression* one_expr = | |
5774 | gogo->backend()->integer_constant_expression(btype, one); | |
5775 | ||
5776 | if (type->integer_type()->is_unsigned()) | |
29a2d1d8 | 5777 | { |
5778 | // An unsigned -1 is the largest possible number, so | |
5779 | // dividing is always 1 or 0. | |
a32698ee | 5780 | |
5781 | Bexpression* cmp = | |
5782 | gogo->backend()->binary_expression(OPERATOR_EQEQ, | |
5783 | left, right, loc); | |
29a2d1d8 | 5784 | if (this->op_ == OPERATOR_DIV) |
a32698ee | 5785 | overflow = |
5786 | gogo->backend()->conditional_expression(btype, cmp, | |
5787 | one_expr, zero_expr, | |
5788 | loc); | |
29a2d1d8 | 5789 | else |
a32698ee | 5790 | overflow = |
5791 | gogo->backend()->conditional_expression(btype, cmp, | |
5792 | zero_expr, left, | |
5793 | loc); | |
29a2d1d8 | 5794 | } |
5795 | else | |
5796 | { | |
5797 | // Computing left / -1 is the same as computing - left, | |
5798 | // which does not overflow since Go sets -fwrapv. | |
5799 | if (this->op_ == OPERATOR_DIV) | |
a32698ee | 5800 | { |
5801 | Expression* negate_expr = | |
5802 | Expression::make_unary(OPERATOR_MINUS, this->left_, loc); | |
ea664253 | 5803 | overflow = negate_expr->get_backend(context); |
a32698ee | 5804 | } |
29a2d1d8 | 5805 | else |
a32698ee | 5806 | overflow = zero_expr; |
29a2d1d8 | 5807 | } |
a32698ee | 5808 | overflow = gogo->backend()->convert_expression(btype, overflow, loc); |
29a2d1d8 | 5809 | |
5810 | // right == -1 ? - left : ret | |
a32698ee | 5811 | ret = gogo->backend()->conditional_expression(btype, check, overflow, |
5812 | ret, loc); | |
29a2d1d8 | 5813 | } |
e440a328 | 5814 | } |
5815 | ||
a32698ee | 5816 | mpz_clear(zero); |
5817 | mpz_clear(one); | |
5818 | mpz_clear(neg_one); | |
ea664253 | 5819 | return ret; |
e440a328 | 5820 | } |
5821 | ||
5822 | // Export a binary expression. | |
5823 | ||
5824 | void | |
5825 | Binary_expression::do_export(Export* exp) const | |
5826 | { | |
5827 | exp->write_c_string("("); | |
5828 | this->left_->export_expression(exp); | |
5829 | switch (this->op_) | |
5830 | { | |
5831 | case OPERATOR_OROR: | |
5832 | exp->write_c_string(" || "); | |
5833 | break; | |
5834 | case OPERATOR_ANDAND: | |
5835 | exp->write_c_string(" && "); | |
5836 | break; | |
5837 | case OPERATOR_EQEQ: | |
5838 | exp->write_c_string(" == "); | |
5839 | break; | |
5840 | case OPERATOR_NOTEQ: | |
5841 | exp->write_c_string(" != "); | |
5842 | break; | |
5843 | case OPERATOR_LT: | |
5844 | exp->write_c_string(" < "); | |
5845 | break; | |
5846 | case OPERATOR_LE: | |
5847 | exp->write_c_string(" <= "); | |
5848 | break; | |
5849 | case OPERATOR_GT: | |
5850 | exp->write_c_string(" > "); | |
5851 | break; | |
5852 | case OPERATOR_GE: | |
5853 | exp->write_c_string(" >= "); | |
5854 | break; | |
5855 | case OPERATOR_PLUS: | |
5856 | exp->write_c_string(" + "); | |
5857 | break; | |
5858 | case OPERATOR_MINUS: | |
5859 | exp->write_c_string(" - "); | |
5860 | break; | |
5861 | case OPERATOR_OR: | |
5862 | exp->write_c_string(" | "); | |
5863 | break; | |
5864 | case OPERATOR_XOR: | |
5865 | exp->write_c_string(" ^ "); | |
5866 | break; | |
5867 | case OPERATOR_MULT: | |
5868 | exp->write_c_string(" * "); | |
5869 | break; | |
5870 | case OPERATOR_DIV: | |
5871 | exp->write_c_string(" / "); | |
5872 | break; | |
5873 | case OPERATOR_MOD: | |
5874 | exp->write_c_string(" % "); | |
5875 | break; | |
5876 | case OPERATOR_LSHIFT: | |
5877 | exp->write_c_string(" << "); | |
5878 | break; | |
5879 | case OPERATOR_RSHIFT: | |
5880 | exp->write_c_string(" >> "); | |
5881 | break; | |
5882 | case OPERATOR_AND: | |
5883 | exp->write_c_string(" & "); | |
5884 | break; | |
5885 | case OPERATOR_BITCLEAR: | |
5886 | exp->write_c_string(" &^ "); | |
5887 | break; | |
5888 | default: | |
c3e6f413 | 5889 | go_unreachable(); |
e440a328 | 5890 | } |
5891 | this->right_->export_expression(exp); | |
5892 | exp->write_c_string(")"); | |
5893 | } | |
5894 | ||
5895 | // Import a binary expression. | |
5896 | ||
5897 | Expression* | |
5898 | Binary_expression::do_import(Import* imp) | |
5899 | { | |
5900 | imp->require_c_string("("); | |
5901 | ||
5902 | Expression* left = Expression::import_expression(imp); | |
5903 | ||
5904 | Operator op; | |
5905 | if (imp->match_c_string(" || ")) | |
5906 | { | |
5907 | op = OPERATOR_OROR; | |
5908 | imp->advance(4); | |
5909 | } | |
5910 | else if (imp->match_c_string(" && ")) | |
5911 | { | |
5912 | op = OPERATOR_ANDAND; | |
5913 | imp->advance(4); | |
5914 | } | |
5915 | else if (imp->match_c_string(" == ")) | |
5916 | { | |
5917 | op = OPERATOR_EQEQ; | |
5918 | imp->advance(4); | |
5919 | } | |
5920 | else if (imp->match_c_string(" != ")) | |
5921 | { | |
5922 | op = OPERATOR_NOTEQ; | |
5923 | imp->advance(4); | |
5924 | } | |
5925 | else if (imp->match_c_string(" < ")) | |
5926 | { | |
5927 | op = OPERATOR_LT; | |
5928 | imp->advance(3); | |
5929 | } | |
5930 | else if (imp->match_c_string(" <= ")) | |
5931 | { | |
5932 | op = OPERATOR_LE; | |
5933 | imp->advance(4); | |
5934 | } | |
5935 | else if (imp->match_c_string(" > ")) | |
5936 | { | |
5937 | op = OPERATOR_GT; | |
5938 | imp->advance(3); | |
5939 | } | |
5940 | else if (imp->match_c_string(" >= ")) | |
5941 | { | |
5942 | op = OPERATOR_GE; | |
5943 | imp->advance(4); | |
5944 | } | |
5945 | else if (imp->match_c_string(" + ")) | |
5946 | { | |
5947 | op = OPERATOR_PLUS; | |
5948 | imp->advance(3); | |
5949 | } | |
5950 | else if (imp->match_c_string(" - ")) | |
5951 | { | |
5952 | op = OPERATOR_MINUS; | |
5953 | imp->advance(3); | |
5954 | } | |
5955 | else if (imp->match_c_string(" | ")) | |
5956 | { | |
5957 | op = OPERATOR_OR; | |
5958 | imp->advance(3); | |
5959 | } | |
5960 | else if (imp->match_c_string(" ^ ")) | |
5961 | { | |
5962 | op = OPERATOR_XOR; | |
5963 | imp->advance(3); | |
5964 | } | |
5965 | else if (imp->match_c_string(" * ")) | |
5966 | { | |
5967 | op = OPERATOR_MULT; | |
5968 | imp->advance(3); | |
5969 | } | |
5970 | else if (imp->match_c_string(" / ")) | |
5971 | { | |
5972 | op = OPERATOR_DIV; | |
5973 | imp->advance(3); | |
5974 | } | |
5975 | else if (imp->match_c_string(" % ")) | |
5976 | { | |
5977 | op = OPERATOR_MOD; | |
5978 | imp->advance(3); | |
5979 | } | |
5980 | else if (imp->match_c_string(" << ")) | |
5981 | { | |
5982 | op = OPERATOR_LSHIFT; | |
5983 | imp->advance(4); | |
5984 | } | |
5985 | else if (imp->match_c_string(" >> ")) | |
5986 | { | |
5987 | op = OPERATOR_RSHIFT; | |
5988 | imp->advance(4); | |
5989 | } | |
5990 | else if (imp->match_c_string(" & ")) | |
5991 | { | |
5992 | op = OPERATOR_AND; | |
5993 | imp->advance(3); | |
5994 | } | |
5995 | else if (imp->match_c_string(" &^ ")) | |
5996 | { | |
5997 | op = OPERATOR_BITCLEAR; | |
5998 | imp->advance(4); | |
5999 | } | |
6000 | else | |
6001 | { | |
6002 | error_at(imp->location(), "unrecognized binary operator"); | |
6003 | return Expression::make_error(imp->location()); | |
6004 | } | |
6005 | ||
6006 | Expression* right = Expression::import_expression(imp); | |
6007 | ||
6008 | imp->require_c_string(")"); | |
6009 | ||
6010 | return Expression::make_binary(op, left, right, imp->location()); | |
6011 | } | |
6012 | ||
d751bb78 | 6013 | // Dump ast representation of a binary expression. |
6014 | ||
6015 | void | |
6016 | Binary_expression::do_dump_expression(Ast_dump_context* ast_dump_context) const | |
6017 | { | |
6018 | ast_dump_context->ostream() << "("; | |
6019 | ast_dump_context->dump_expression(this->left_); | |
6020 | ast_dump_context->ostream() << " "; | |
6021 | ast_dump_context->dump_operator(this->op_); | |
6022 | ast_dump_context->ostream() << " "; | |
6023 | ast_dump_context->dump_expression(this->right_); | |
6024 | ast_dump_context->ostream() << ") "; | |
6025 | } | |
6026 | ||
e440a328 | 6027 | // Make a binary expression. |
6028 | ||
6029 | Expression* | |
6030 | Expression::make_binary(Operator op, Expression* left, Expression* right, | |
b13c66cd | 6031 | Location location) |
e440a328 | 6032 | { |
6033 | return new Binary_expression(op, left, right, location); | |
6034 | } | |
6035 | ||
6036 | // Implement a comparison. | |
6037 | ||
a32698ee | 6038 | Bexpression* |
6039 | Expression::comparison(Translate_context* context, Type* result_type, | |
6040 | Operator op, Expression* left, Expression* right, | |
6041 | Location location) | |
e440a328 | 6042 | { |
2387f644 | 6043 | Type* left_type = left->type(); |
6044 | Type* right_type = right->type(); | |
ceeb12d7 | 6045 | |
e67508fa | 6046 | Expression* zexpr = Expression::make_integer_ul(0, NULL, location); |
1b1f2abf | 6047 | |
15c67ee2 | 6048 | if (left_type->is_string_type() && right_type->is_string_type()) |
e440a328 | 6049 | { |
2387f644 | 6050 | left = Runtime::make_call(Runtime::STRCMP, location, 2, |
6051 | left, right); | |
6052 | right = zexpr; | |
e440a328 | 6053 | } |
15c67ee2 | 6054 | else if ((left_type->interface_type() != NULL |
6055 | && right_type->interface_type() == NULL | |
6056 | && !right_type->is_nil_type()) | |
6057 | || (left_type->interface_type() == NULL | |
6058 | && !left_type->is_nil_type() | |
6059 | && right_type->interface_type() != NULL)) | |
e440a328 | 6060 | { |
6061 | // Comparing an interface value to a non-interface value. | |
6062 | if (left_type->interface_type() == NULL) | |
6063 | { | |
6064 | std::swap(left_type, right_type); | |
2387f644 | 6065 | std::swap(left, right); |
e440a328 | 6066 | } |
6067 | ||
6068 | // The right operand is not an interface. We need to take its | |
6069 | // address if it is not a pointer. | |
ceeb12d7 | 6070 | Expression* pointer_arg = NULL; |
e440a328 | 6071 | if (right_type->points_to() != NULL) |
2387f644 | 6072 | pointer_arg = right; |
e440a328 | 6073 | else |
6074 | { | |
2387f644 | 6075 | go_assert(right->is_addressable()); |
6076 | pointer_arg = Expression::make_unary(OPERATOR_AND, right, | |
ceeb12d7 | 6077 | location); |
e440a328 | 6078 | } |
e440a328 | 6079 | |
2387f644 | 6080 | Expression* descriptor = |
6081 | Expression::make_type_descriptor(right_type, location); | |
6082 | left = | |
ceeb12d7 | 6083 | Runtime::make_call((left_type->interface_type()->is_empty() |
6084 | ? Runtime::EMPTY_INTERFACE_VALUE_COMPARE | |
6085 | : Runtime::INTERFACE_VALUE_COMPARE), | |
2387f644 | 6086 | location, 3, left, descriptor, |
ceeb12d7 | 6087 | pointer_arg); |
2387f644 | 6088 | right = zexpr; |
e440a328 | 6089 | } |
6090 | else if (left_type->interface_type() != NULL | |
6091 | && right_type->interface_type() != NULL) | |
6092 | { | |
ceeb12d7 | 6093 | Runtime::Function compare_function; |
739bad04 | 6094 | if (left_type->interface_type()->is_empty() |
6095 | && right_type->interface_type()->is_empty()) | |
ceeb12d7 | 6096 | compare_function = Runtime::EMPTY_INTERFACE_COMPARE; |
739bad04 | 6097 | else if (!left_type->interface_type()->is_empty() |
6098 | && !right_type->interface_type()->is_empty()) | |
ceeb12d7 | 6099 | compare_function = Runtime::INTERFACE_COMPARE; |
739bad04 | 6100 | else |
6101 | { | |
6102 | if (left_type->interface_type()->is_empty()) | |
6103 | { | |
c484d925 | 6104 | go_assert(op == OPERATOR_EQEQ || op == OPERATOR_NOTEQ); |
739bad04 | 6105 | std::swap(left_type, right_type); |
2387f644 | 6106 | std::swap(left, right); |
739bad04 | 6107 | } |
c484d925 | 6108 | go_assert(!left_type->interface_type()->is_empty()); |
6109 | go_assert(right_type->interface_type()->is_empty()); | |
ceeb12d7 | 6110 | compare_function = Runtime::INTERFACE_EMPTY_COMPARE; |
739bad04 | 6111 | } |
6112 | ||
2387f644 | 6113 | left = Runtime::make_call(compare_function, location, 2, left, right); |
6114 | right = zexpr; | |
e440a328 | 6115 | } |
6116 | ||
6117 | if (left_type->is_nil_type() | |
6118 | && (op == OPERATOR_EQEQ || op == OPERATOR_NOTEQ)) | |
6119 | { | |
6120 | std::swap(left_type, right_type); | |
2387f644 | 6121 | std::swap(left, right); |
e440a328 | 6122 | } |
6123 | ||
6124 | if (right_type->is_nil_type()) | |
6125 | { | |
2387f644 | 6126 | right = Expression::make_nil(location); |
e440a328 | 6127 | if (left_type->array_type() != NULL |
6128 | && left_type->array_type()->length() == NULL) | |
6129 | { | |
6130 | Array_type* at = left_type->array_type(); | |
2387f644 | 6131 | left = at->get_value_pointer(context->gogo(), left); |
e440a328 | 6132 | } |
6133 | else if (left_type->interface_type() != NULL) | |
6134 | { | |
6135 | // An interface is nil if the first field is nil. | |
2387f644 | 6136 | left = Expression::make_field_reference(left, 0, location); |
e440a328 | 6137 | } |
6138 | } | |
6139 | ||
ea664253 | 6140 | Bexpression* left_bexpr = left->get_backend(context); |
6141 | Bexpression* right_bexpr = right->get_backend(context); | |
e90c9dfc | 6142 | |
a32698ee | 6143 | Gogo* gogo = context->gogo(); |
6144 | Bexpression* ret = gogo->backend()->binary_expression(op, left_bexpr, | |
6145 | right_bexpr, location); | |
6146 | if (result_type != NULL) | |
6147 | ret = gogo->backend()->convert_expression(result_type->get_backend(gogo), | |
6148 | ret, location); | |
e440a328 | 6149 | return ret; |
6150 | } | |
6151 | ||
6152 | // Class Bound_method_expression. | |
6153 | ||
6154 | // Traversal. | |
6155 | ||
6156 | int | |
6157 | Bound_method_expression::do_traverse(Traverse* traverse) | |
6158 | { | |
e0659c9e | 6159 | return Expression::traverse(&this->expr_, traverse); |
e440a328 | 6160 | } |
6161 | ||
0afbb937 | 6162 | // Lower the expression. If this is a method value rather than being |
6163 | // called, and the method is accessed via a pointer, we may need to | |
6164 | // add nil checks. Introduce a temporary variable so that those nil | |
6165 | // checks do not cause multiple evaluation. | |
6166 | ||
6167 | Expression* | |
6168 | Bound_method_expression::do_lower(Gogo*, Named_object*, | |
6169 | Statement_inserter* inserter, int) | |
6170 | { | |
6171 | // For simplicity we use a temporary for every call to an embedded | |
6172 | // method, even though some of them might be pure value methods and | |
6173 | // not require a temporary. | |
6174 | if (this->expr_->var_expression() == NULL | |
6175 | && this->expr_->temporary_reference_expression() == NULL | |
6176 | && this->expr_->set_and_use_temporary_expression() == NULL | |
6177 | && (this->method_->field_indexes() != NULL | |
6178 | || (this->method_->is_value_method() | |
6179 | && this->expr_->type()->points_to() != NULL))) | |
6180 | { | |
6181 | Temporary_statement* temp = | |
6182 | Statement::make_temporary(this->expr_->type(), NULL, this->location()); | |
6183 | inserter->insert(temp); | |
6184 | this->expr_ = Expression::make_set_and_use_temporary(temp, this->expr_, | |
6185 | this->location()); | |
6186 | } | |
6187 | return this; | |
6188 | } | |
6189 | ||
e440a328 | 6190 | // Return the type of a bound method expression. The type of this |
0afbb937 | 6191 | // object is simply the type of the method with no receiver. |
e440a328 | 6192 | |
6193 | Type* | |
6194 | Bound_method_expression::do_type() | |
6195 | { | |
0afbb937 | 6196 | Named_object* fn = this->method_->named_object(); |
6197 | Function_type* fntype; | |
6198 | if (fn->is_function()) | |
6199 | fntype = fn->func_value()->type(); | |
6200 | else if (fn->is_function_declaration()) | |
6201 | fntype = fn->func_declaration_value()->type(); | |
e0659c9e | 6202 | else |
6203 | return Type::make_error_type(); | |
0afbb937 | 6204 | return fntype->copy_without_receiver(); |
e440a328 | 6205 | } |
6206 | ||
6207 | // Determine the types of a method expression. | |
6208 | ||
6209 | void | |
6210 | Bound_method_expression::do_determine_type(const Type_context*) | |
6211 | { | |
0afbb937 | 6212 | Named_object* fn = this->method_->named_object(); |
6213 | Function_type* fntype; | |
6214 | if (fn->is_function()) | |
6215 | fntype = fn->func_value()->type(); | |
6216 | else if (fn->is_function_declaration()) | |
6217 | fntype = fn->func_declaration_value()->type(); | |
6218 | else | |
6219 | fntype = NULL; | |
e440a328 | 6220 | if (fntype == NULL || !fntype->is_method()) |
6221 | this->expr_->determine_type_no_context(); | |
6222 | else | |
6223 | { | |
6224 | Type_context subcontext(fntype->receiver()->type(), false); | |
6225 | this->expr_->determine_type(&subcontext); | |
6226 | } | |
6227 | } | |
6228 | ||
6229 | // Check the types of a method expression. | |
6230 | ||
6231 | void | |
6232 | Bound_method_expression::do_check_types(Gogo*) | |
6233 | { | |
0afbb937 | 6234 | Named_object* fn = this->method_->named_object(); |
6235 | if (!fn->is_function() && !fn->is_function_declaration()) | |
6236 | { | |
6237 | this->report_error(_("object is not a method")); | |
6238 | return; | |
6239 | } | |
6240 | ||
6241 | Function_type* fntype; | |
6242 | if (fn->is_function()) | |
6243 | fntype = fn->func_value()->type(); | |
6244 | else if (fn->is_function_declaration()) | |
6245 | fntype = fn->func_declaration_value()->type(); | |
e440a328 | 6246 | else |
0afbb937 | 6247 | go_unreachable(); |
6248 | Type* rtype = fntype->receiver()->type()->deref(); | |
6249 | Type* etype = (this->expr_type_ != NULL | |
6250 | ? this->expr_type_ | |
6251 | : this->expr_->type()); | |
6252 | etype = etype->deref(); | |
6253 | if (!Type::are_identical(rtype, etype, true, NULL)) | |
6254 | this->report_error(_("method type does not match object type")); | |
6255 | } | |
6256 | ||
6257 | // If a bound method expression is not simply called, then it is | |
6258 | // represented as a closure. The closure will hold a single variable, | |
6259 | // the receiver to pass to the method. The function will be a simple | |
6260 | // thunk that pulls that value from the closure and calls the method | |
6261 | // with the remaining arguments. | |
6262 | // | |
6263 | // Because method values are not common, we don't build all thunks for | |
6264 | // every methods, but instead only build them as we need them. In | |
6265 | // particular, we even build them on demand for methods defined in | |
6266 | // other packages. | |
6267 | ||
6268 | Bound_method_expression::Method_value_thunks | |
6269 | Bound_method_expression::method_value_thunks; | |
6270 | ||
6271 | // Find or create the thunk for METHOD. | |
6272 | ||
6273 | Named_object* | |
6274 | Bound_method_expression::create_thunk(Gogo* gogo, const Method* method, | |
6275 | Named_object* fn) | |
6276 | { | |
6277 | std::pair<Named_object*, Named_object*> val(fn, NULL); | |
6278 | std::pair<Method_value_thunks::iterator, bool> ins = | |
6279 | Bound_method_expression::method_value_thunks.insert(val); | |
6280 | if (!ins.second) | |
6281 | { | |
6282 | // We have seen this method before. | |
6283 | go_assert(ins.first->second != NULL); | |
6284 | return ins.first->second; | |
6285 | } | |
6286 | ||
6287 | Location loc = fn->location(); | |
6288 | ||
6289 | Function_type* orig_fntype; | |
6290 | if (fn->is_function()) | |
6291 | orig_fntype = fn->func_value()->type(); | |
6292 | else if (fn->is_function_declaration()) | |
6293 | orig_fntype = fn->func_declaration_value()->type(); | |
6294 | else | |
6295 | orig_fntype = NULL; | |
6296 | ||
6297 | if (orig_fntype == NULL || !orig_fntype->is_method()) | |
e440a328 | 6298 | { |
0afbb937 | 6299 | ins.first->second = Named_object::make_erroneous_name(Gogo::thunk_name()); |
6300 | return ins.first->second; | |
e440a328 | 6301 | } |
0afbb937 | 6302 | |
6303 | Struct_field_list* sfl = new Struct_field_list(); | |
f8bdf81a | 6304 | // The type here is wrong--it should be the C function type. But it |
6305 | // doesn't really matter. | |
0afbb937 | 6306 | Type* vt = Type::make_pointer_type(Type::make_void_type()); |
6307 | sfl->push_back(Struct_field(Typed_identifier("fn.0", vt, loc))); | |
6308 | sfl->push_back(Struct_field(Typed_identifier("val.1", | |
6309 | orig_fntype->receiver()->type(), | |
6310 | loc))); | |
6311 | Type* closure_type = Type::make_struct_type(sfl, loc); | |
6312 | closure_type = Type::make_pointer_type(closure_type); | |
6313 | ||
f8bdf81a | 6314 | Function_type* new_fntype = orig_fntype->copy_with_names(); |
0afbb937 | 6315 | |
6316 | Named_object* new_no = gogo->start_function(Gogo::thunk_name(), new_fntype, | |
6317 | false, loc); | |
6318 | ||
f8bdf81a | 6319 | Variable* cvar = new Variable(closure_type, NULL, false, false, false, loc); |
6320 | cvar->set_is_used(); | |
6321 | Named_object* cp = Named_object::make_variable("$closure", NULL, cvar); | |
6322 | new_no->func_value()->set_closure_var(cp); | |
0afbb937 | 6323 | |
f8bdf81a | 6324 | gogo->start_block(loc); |
0afbb937 | 6325 | |
6326 | // Field 0 of the closure is the function code pointer, field 1 is | |
6327 | // the value on which to invoke the method. | |
6328 | Expression* arg = Expression::make_var_reference(cp, loc); | |
6329 | arg = Expression::make_unary(OPERATOR_MULT, arg, loc); | |
6330 | arg = Expression::make_field_reference(arg, 1, loc); | |
6331 | ||
6332 | Expression* bme = Expression::make_bound_method(arg, method, fn, loc); | |
6333 | ||
6334 | const Typed_identifier_list* orig_params = orig_fntype->parameters(); | |
6335 | Expression_list* args; | |
6336 | if (orig_params == NULL || orig_params->empty()) | |
6337 | args = NULL; | |
6338 | else | |
6339 | { | |
6340 | const Typed_identifier_list* new_params = new_fntype->parameters(); | |
6341 | args = new Expression_list(); | |
6342 | for (Typed_identifier_list::const_iterator p = new_params->begin(); | |
f8bdf81a | 6343 | p != new_params->end(); |
0afbb937 | 6344 | ++p) |
6345 | { | |
6346 | Named_object* p_no = gogo->lookup(p->name(), NULL); | |
6347 | go_assert(p_no != NULL | |
6348 | && p_no->is_variable() | |
6349 | && p_no->var_value()->is_parameter()); | |
6350 | args->push_back(Expression::make_var_reference(p_no, loc)); | |
6351 | } | |
6352 | } | |
6353 | ||
6354 | Call_expression* call = Expression::make_call(bme, args, | |
6355 | orig_fntype->is_varargs(), | |
6356 | loc); | |
6357 | call->set_varargs_are_lowered(); | |
6358 | ||
6359 | Statement* s = Statement::make_return_from_call(call, loc); | |
6360 | gogo->add_statement(s); | |
6361 | Block* b = gogo->finish_block(loc); | |
6362 | gogo->add_block(b, loc); | |
6363 | gogo->lower_block(new_no, b); | |
a32698ee | 6364 | gogo->flatten_block(new_no, b); |
0afbb937 | 6365 | gogo->finish_function(loc); |
6366 | ||
6367 | ins.first->second = new_no; | |
6368 | return new_no; | |
6369 | } | |
6370 | ||
6371 | // Return an expression to check *REF for nil while dereferencing | |
6372 | // according to FIELD_INDEXES. Update *REF to build up the field | |
6373 | // reference. This is a static function so that we don't have to | |
6374 | // worry about declaring Field_indexes in expressions.h. | |
6375 | ||
6376 | static Expression* | |
6377 | bme_check_nil(const Method::Field_indexes* field_indexes, Location loc, | |
6378 | Expression** ref) | |
6379 | { | |
6380 | if (field_indexes == NULL) | |
6381 | return Expression::make_boolean(false, loc); | |
6382 | Expression* cond = bme_check_nil(field_indexes->next, loc, ref); | |
6383 | Struct_type* stype = (*ref)->type()->deref()->struct_type(); | |
6384 | go_assert(stype != NULL | |
6385 | && field_indexes->field_index < stype->field_count()); | |
6386 | if ((*ref)->type()->struct_type() == NULL) | |
6387 | { | |
6388 | go_assert((*ref)->type()->points_to() != NULL); | |
6389 | Expression* n = Expression::make_binary(OPERATOR_EQEQ, *ref, | |
6390 | Expression::make_nil(loc), | |
6391 | loc); | |
6392 | cond = Expression::make_binary(OPERATOR_OROR, cond, n, loc); | |
6393 | *ref = Expression::make_unary(OPERATOR_MULT, *ref, loc); | |
6394 | go_assert((*ref)->type()->struct_type() == stype); | |
6395 | } | |
6396 | *ref = Expression::make_field_reference(*ref, field_indexes->field_index, | |
6397 | loc); | |
6398 | return cond; | |
e440a328 | 6399 | } |
6400 | ||
ea664253 | 6401 | // Get the backend representation for a method value. |
e440a328 | 6402 | |
ea664253 | 6403 | Bexpression* |
6404 | Bound_method_expression::do_get_backend(Translate_context* context) | |
e440a328 | 6405 | { |
0afbb937 | 6406 | Named_object* thunk = Bound_method_expression::create_thunk(context->gogo(), |
6407 | this->method_, | |
6408 | this->function_); | |
6409 | if (thunk->is_erroneous()) | |
6410 | { | |
6411 | go_assert(saw_errors()); | |
ea664253 | 6412 | return context->backend()->error_expression(); |
0afbb937 | 6413 | } |
6414 | ||
6415 | // FIXME: We should lower this earlier, but we can't lower it in the | |
6416 | // lowering pass because at that point we don't know whether we need | |
6417 | // to create the thunk or not. If the expression is called, we | |
6418 | // don't need the thunk. | |
6419 | ||
6420 | Location loc = this->location(); | |
6421 | ||
6422 | // If the method expects a value, and we have a pointer, we need to | |
6423 | // dereference the pointer. | |
6424 | ||
6425 | Named_object* fn = this->method_->named_object(); | |
6426 | Function_type* fntype; | |
6427 | if (fn->is_function()) | |
6428 | fntype = fn->func_value()->type(); | |
6429 | else if (fn->is_function_declaration()) | |
6430 | fntype = fn->func_declaration_value()->type(); | |
6431 | else | |
6432 | go_unreachable(); | |
6433 | ||
6434 | Expression* val = this->expr_; | |
6435 | if (fntype->receiver()->type()->points_to() == NULL | |
6436 | && val->type()->points_to() != NULL) | |
6437 | val = Expression::make_unary(OPERATOR_MULT, val, loc); | |
6438 | ||
6439 | // Note that we are ignoring this->expr_type_ here. The thunk will | |
6440 | // expect a closure whose second field has type this->expr_type_ (if | |
6441 | // that is not NULL). We are going to pass it a closure whose | |
6442 | // second field has type this->expr_->type(). Since | |
6443 | // this->expr_type_ is only not-NULL for pointer types, we can get | |
6444 | // away with this. | |
6445 | ||
6446 | Struct_field_list* fields = new Struct_field_list(); | |
6447 | fields->push_back(Struct_field(Typed_identifier("fn.0", | |
6448 | thunk->func_value()->type(), | |
6449 | loc))); | |
6450 | fields->push_back(Struct_field(Typed_identifier("val.1", val->type(), loc))); | |
6451 | Struct_type* st = Type::make_struct_type(fields, loc); | |
6452 | ||
6453 | Expression_list* vals = new Expression_list(); | |
6454 | vals->push_back(Expression::make_func_code_reference(thunk, loc)); | |
6455 | vals->push_back(val); | |
6456 | ||
6457 | Expression* ret = Expression::make_struct_composite_literal(st, vals, loc); | |
2c809f8f | 6458 | ret = Expression::make_heap_expression(ret, loc); |
0afbb937 | 6459 | |
0afbb937 | 6460 | // See whether the expression or any embedded pointers are nil. |
6461 | ||
df7ef1fd | 6462 | Expression* nil_check = NULL; |
0afbb937 | 6463 | Expression* expr = this->expr_; |
6464 | if (this->method_->field_indexes() != NULL) | |
6465 | { | |
6466 | // Note that we are evaluating this->expr_ twice, but that is OK | |
6467 | // because in the lowering pass we forced it into a temporary | |
6468 | // variable. | |
6469 | Expression* ref = expr; | |
6470 | nil_check = bme_check_nil(this->method_->field_indexes(), loc, &ref); | |
6471 | expr = ref; | |
6472 | } | |
6473 | ||
6474 | if (this->method_->is_value_method() && expr->type()->points_to() != NULL) | |
6475 | { | |
6476 | Expression* n = Expression::make_binary(OPERATOR_EQEQ, expr, | |
6477 | Expression::make_nil(loc), | |
6478 | loc); | |
6479 | if (nil_check == NULL) | |
6480 | nil_check = n; | |
6481 | else | |
6482 | nil_check = Expression::make_binary(OPERATOR_OROR, nil_check, n, loc); | |
6483 | } | |
6484 | ||
ea664253 | 6485 | Bexpression* bme = ret->get_backend(context); |
0afbb937 | 6486 | if (nil_check != NULL) |
6487 | { | |
df7ef1fd | 6488 | Gogo* gogo = context->gogo(); |
ea664253 | 6489 | Bexpression* crash = |
6490 | gogo->runtime_error(RUNTIME_ERROR_NIL_DEREFERENCE, | |
6491 | loc)->get_backend(context); | |
df7ef1fd | 6492 | Btype* btype = ret->type()->get_backend(gogo); |
ea664253 | 6493 | Bexpression* bcheck = nil_check->get_backend(context); |
6494 | bme = gogo->backend()->conditional_expression(btype, bcheck, crash, | |
df7ef1fd | 6495 | bme, loc); |
6496 | } | |
ea664253 | 6497 | return bme; |
e440a328 | 6498 | } |
6499 | ||
d751bb78 | 6500 | // Dump ast representation of a bound method expression. |
6501 | ||
6502 | void | |
6503 | Bound_method_expression::do_dump_expression(Ast_dump_context* ast_dump_context) | |
6504 | const | |
6505 | { | |
6506 | if (this->expr_type_ != NULL) | |
6507 | ast_dump_context->ostream() << "("; | |
6508 | ast_dump_context->dump_expression(this->expr_); | |
6509 | if (this->expr_type_ != NULL) | |
6510 | { | |
6511 | ast_dump_context->ostream() << ":"; | |
6512 | ast_dump_context->dump_type(this->expr_type_); | |
6513 | ast_dump_context->ostream() << ")"; | |
6514 | } | |
6515 | ||
0afbb937 | 6516 | ast_dump_context->ostream() << "." << this->function_->name(); |
d751bb78 | 6517 | } |
6518 | ||
e440a328 | 6519 | // Make a method expression. |
6520 | ||
6521 | Bound_method_expression* | |
0afbb937 | 6522 | Expression::make_bound_method(Expression* expr, const Method* method, |
6523 | Named_object* function, Location location) | |
e440a328 | 6524 | { |
0afbb937 | 6525 | return new Bound_method_expression(expr, method, function, location); |
e440a328 | 6526 | } |
6527 | ||
6528 | // Class Builtin_call_expression. This is used for a call to a | |
6529 | // builtin function. | |
6530 | ||
6531 | class Builtin_call_expression : public Call_expression | |
6532 | { | |
6533 | public: | |
6534 | Builtin_call_expression(Gogo* gogo, Expression* fn, Expression_list* args, | |
b13c66cd | 6535 | bool is_varargs, Location location); |
e440a328 | 6536 | |
6537 | protected: | |
6538 | // This overrides Call_expression::do_lower. | |
6539 | Expression* | |
ceeb4318 | 6540 | do_lower(Gogo*, Named_object*, Statement_inserter*, int); |
e440a328 | 6541 | |
35a54f17 | 6542 | Expression* |
6543 | do_flatten(Gogo*, Named_object*, Statement_inserter*); | |
6544 | ||
e440a328 | 6545 | bool |
6546 | do_is_constant() const; | |
6547 | ||
6548 | bool | |
0c77715b | 6549 | do_numeric_constant_value(Numeric_constant*) const; |
e440a328 | 6550 | |
4f2138d7 | 6551 | bool |
a7549a6a | 6552 | do_discarding_value(); |
6553 | ||
e440a328 | 6554 | Type* |
6555 | do_type(); | |
6556 | ||
6557 | void | |
6558 | do_determine_type(const Type_context*); | |
6559 | ||
6560 | void | |
6561 | do_check_types(Gogo*); | |
6562 | ||
6563 | Expression* | |
72666aed | 6564 | do_copy(); |
e440a328 | 6565 | |
ea664253 | 6566 | Bexpression* |
6567 | do_get_backend(Translate_context*); | |
e440a328 | 6568 | |
6569 | void | |
6570 | do_export(Export*) const; | |
6571 | ||
6572 | virtual bool | |
6573 | do_is_recover_call() const; | |
6574 | ||
6575 | virtual void | |
6576 | do_set_recover_arg(Expression*); | |
6577 | ||
6578 | private: | |
6579 | // The builtin functions. | |
6580 | enum Builtin_function_code | |
6581 | { | |
6582 | BUILTIN_INVALID, | |
6583 | ||
6584 | // Predeclared builtin functions. | |
6585 | BUILTIN_APPEND, | |
6586 | BUILTIN_CAP, | |
6587 | BUILTIN_CLOSE, | |
48080209 | 6588 | BUILTIN_COMPLEX, |
e440a328 | 6589 | BUILTIN_COPY, |
1cce762f | 6590 | BUILTIN_DELETE, |
e440a328 | 6591 | BUILTIN_IMAG, |
6592 | BUILTIN_LEN, | |
6593 | BUILTIN_MAKE, | |
6594 | BUILTIN_NEW, | |
6595 | BUILTIN_PANIC, | |
6596 | BUILTIN_PRINT, | |
6597 | BUILTIN_PRINTLN, | |
6598 | BUILTIN_REAL, | |
6599 | BUILTIN_RECOVER, | |
6600 | ||
6601 | // Builtin functions from the unsafe package. | |
6602 | BUILTIN_ALIGNOF, | |
6603 | BUILTIN_OFFSETOF, | |
6604 | BUILTIN_SIZEOF | |
6605 | }; | |
6606 | ||
6607 | Expression* | |
6608 | one_arg() const; | |
6609 | ||
6610 | bool | |
6611 | check_one_arg(); | |
6612 | ||
6613 | static Type* | |
6614 | real_imag_type(Type*); | |
6615 | ||
6616 | static Type* | |
48080209 | 6617 | complex_type(Type*); |
e440a328 | 6618 | |
a9182619 | 6619 | Expression* |
6620 | lower_make(); | |
6621 | ||
6622 | bool | |
1ad00fd4 | 6623 | check_int_value(Expression*, bool is_length); |
a9182619 | 6624 | |
e440a328 | 6625 | // A pointer back to the general IR structure. This avoids a global |
6626 | // variable, or passing it around everywhere. | |
6627 | Gogo* gogo_; | |
6628 | // The builtin function being called. | |
6629 | Builtin_function_code code_; | |
0f914071 | 6630 | // Used to stop endless loops when the length of an array uses len |
6631 | // or cap of the array itself. | |
6632 | mutable bool seen_; | |
6334270b | 6633 | // Whether the argument is set for calls to BUILTIN_RECOVER. |
6634 | bool recover_arg_is_set_; | |
e440a328 | 6635 | }; |
6636 | ||
6637 | Builtin_call_expression::Builtin_call_expression(Gogo* gogo, | |
6638 | Expression* fn, | |
6639 | Expression_list* args, | |
6640 | bool is_varargs, | |
b13c66cd | 6641 | Location location) |
e440a328 | 6642 | : Call_expression(fn, args, is_varargs, location), |
6334270b | 6643 | gogo_(gogo), code_(BUILTIN_INVALID), seen_(false), |
6644 | recover_arg_is_set_(false) | |
e440a328 | 6645 | { |
6646 | Func_expression* fnexp = this->fn()->func_expression(); | |
c484d925 | 6647 | go_assert(fnexp != NULL); |
e440a328 | 6648 | const std::string& name(fnexp->named_object()->name()); |
6649 | if (name == "append") | |
6650 | this->code_ = BUILTIN_APPEND; | |
6651 | else if (name == "cap") | |
6652 | this->code_ = BUILTIN_CAP; | |
6653 | else if (name == "close") | |
6654 | this->code_ = BUILTIN_CLOSE; | |
48080209 | 6655 | else if (name == "complex") |
6656 | this->code_ = BUILTIN_COMPLEX; | |
e440a328 | 6657 | else if (name == "copy") |
6658 | this->code_ = BUILTIN_COPY; | |
1cce762f | 6659 | else if (name == "delete") |
6660 | this->code_ = BUILTIN_DELETE; | |
e440a328 | 6661 | else if (name == "imag") |
6662 | this->code_ = BUILTIN_IMAG; | |
6663 | else if (name == "len") | |
6664 | this->code_ = BUILTIN_LEN; | |
6665 | else if (name == "make") | |
6666 | this->code_ = BUILTIN_MAKE; | |
6667 | else if (name == "new") | |
6668 | this->code_ = BUILTIN_NEW; | |
6669 | else if (name == "panic") | |
6670 | this->code_ = BUILTIN_PANIC; | |
6671 | else if (name == "print") | |
6672 | this->code_ = BUILTIN_PRINT; | |
6673 | else if (name == "println") | |
6674 | this->code_ = BUILTIN_PRINTLN; | |
6675 | else if (name == "real") | |
6676 | this->code_ = BUILTIN_REAL; | |
6677 | else if (name == "recover") | |
6678 | this->code_ = BUILTIN_RECOVER; | |
6679 | else if (name == "Alignof") | |
6680 | this->code_ = BUILTIN_ALIGNOF; | |
6681 | else if (name == "Offsetof") | |
6682 | this->code_ = BUILTIN_OFFSETOF; | |
6683 | else if (name == "Sizeof") | |
6684 | this->code_ = BUILTIN_SIZEOF; | |
6685 | else | |
c3e6f413 | 6686 | go_unreachable(); |
e440a328 | 6687 | } |
6688 | ||
6689 | // Return whether this is a call to recover. This is a virtual | |
6690 | // function called from the parent class. | |
6691 | ||
6692 | bool | |
6693 | Builtin_call_expression::do_is_recover_call() const | |
6694 | { | |
6695 | if (this->classification() == EXPRESSION_ERROR) | |
6696 | return false; | |
6697 | return this->code_ == BUILTIN_RECOVER; | |
6698 | } | |
6699 | ||
6700 | // Set the argument for a call to recover. | |
6701 | ||
6702 | void | |
6703 | Builtin_call_expression::do_set_recover_arg(Expression* arg) | |
6704 | { | |
6705 | const Expression_list* args = this->args(); | |
c484d925 | 6706 | go_assert(args == NULL || args->empty()); |
e440a328 | 6707 | Expression_list* new_args = new Expression_list(); |
6708 | new_args->push_back(arg); | |
6709 | this->set_args(new_args); | |
6334270b | 6710 | this->recover_arg_is_set_ = true; |
e440a328 | 6711 | } |
6712 | ||
e440a328 | 6713 | // Lower a builtin call expression. This turns new and make into |
6714 | // specific expressions. We also convert to a constant if we can. | |
6715 | ||
6716 | Expression* | |
ceeb4318 | 6717 | Builtin_call_expression::do_lower(Gogo* gogo, Named_object* function, |
6718 | Statement_inserter* inserter, int) | |
e440a328 | 6719 | { |
a9182619 | 6720 | if (this->classification() == EXPRESSION_ERROR) |
6721 | return this; | |
6722 | ||
b13c66cd | 6723 | Location loc = this->location(); |
1cce762f | 6724 | |
a8725655 | 6725 | if (this->is_varargs() && this->code_ != BUILTIN_APPEND) |
6726 | { | |
6727 | this->report_error(_("invalid use of %<...%> with builtin function")); | |
1cce762f | 6728 | return Expression::make_error(loc); |
a8725655 | 6729 | } |
6730 | ||
393ba00b | 6731 | if (this->code_ == BUILTIN_OFFSETOF) |
6732 | { | |
6733 | Expression* arg = this->one_arg(); | |
12e69faa | 6734 | |
6735 | if (arg->bound_method_expression() != NULL | |
6736 | || arg->interface_field_reference_expression() != NULL) | |
6737 | { | |
6738 | this->report_error(_("invalid use of method value as argument " | |
6739 | "of Offsetof")); | |
6740 | return this; | |
6741 | } | |
6742 | ||
393ba00b | 6743 | Field_reference_expression* farg = arg->field_reference_expression(); |
6744 | while (farg != NULL) | |
6745 | { | |
6746 | if (!farg->implicit()) | |
6747 | break; | |
6748 | // When the selector refers to an embedded field, | |
6749 | // it must not be reached through pointer indirections. | |
6750 | if (farg->expr()->deref() != farg->expr()) | |
6751 | { | |
12e69faa | 6752 | this->report_error(_("argument of Offsetof implies " |
6753 | "indirection of an embedded field")); | |
393ba00b | 6754 | return this; |
6755 | } | |
6756 | // Go up until we reach the original base. | |
6757 | farg = farg->expr()->field_reference_expression(); | |
6758 | } | |
6759 | } | |
6760 | ||
1cce762f | 6761 | if (this->is_constant()) |
e440a328 | 6762 | { |
0c77715b | 6763 | Numeric_constant nc; |
6764 | if (this->numeric_constant_value(&nc)) | |
6765 | return nc.expression(loc); | |
e440a328 | 6766 | } |
1cce762f | 6767 | |
6768 | switch (this->code_) | |
e440a328 | 6769 | { |
1cce762f | 6770 | default: |
6771 | break; | |
6772 | ||
6773 | case BUILTIN_NEW: | |
6774 | { | |
6775 | const Expression_list* args = this->args(); | |
6776 | if (args == NULL || args->size() < 1) | |
6777 | this->report_error(_("not enough arguments")); | |
6778 | else if (args->size() > 1) | |
6779 | this->report_error(_("too many arguments")); | |
6780 | else | |
6781 | { | |
6782 | Expression* arg = args->front(); | |
6783 | if (!arg->is_type_expression()) | |
6784 | { | |
6785 | error_at(arg->location(), "expected type"); | |
6786 | this->set_is_error(); | |
6787 | } | |
6788 | else | |
6789 | return Expression::make_allocation(arg->type(), loc); | |
6790 | } | |
6791 | } | |
6792 | break; | |
6793 | ||
6794 | case BUILTIN_MAKE: | |
6795 | return this->lower_make(); | |
6796 | ||
6797 | case BUILTIN_RECOVER: | |
e440a328 | 6798 | if (function != NULL) |
6799 | function->func_value()->set_calls_recover(); | |
6800 | else | |
6801 | { | |
6802 | // Calling recover outside of a function always returns the | |
6803 | // nil empty interface. | |
823c7e3d | 6804 | Type* eface = Type::make_empty_interface_type(loc); |
1cce762f | 6805 | return Expression::make_cast(eface, Expression::make_nil(loc), loc); |
e440a328 | 6806 | } |
1cce762f | 6807 | break; |
6808 | ||
6809 | case BUILTIN_APPEND: | |
6810 | { | |
6811 | // Lower the varargs. | |
6812 | const Expression_list* args = this->args(); | |
6813 | if (args == NULL || args->empty()) | |
e440a328 | 6814 | return this; |
1cce762f | 6815 | Type* slice_type = args->front()->type(); |
6816 | if (!slice_type->is_slice_type()) | |
6817 | { | |
3ff4863b | 6818 | if (slice_type->is_nil_type()) |
6819 | error_at(args->front()->location(), "use of untyped nil"); | |
6820 | else | |
6821 | error_at(args->front()->location(), | |
6822 | "argument 1 must be a slice"); | |
1cce762f | 6823 | this->set_is_error(); |
6824 | return this; | |
6825 | } | |
19fd40c3 | 6826 | Type* element_type = slice_type->array_type()->element_type(); |
6827 | this->lower_varargs(gogo, function, inserter, | |
6828 | Type::make_array_type(element_type, NULL), | |
6829 | 2); | |
1cce762f | 6830 | } |
6831 | break; | |
6832 | ||
6833 | case BUILTIN_DELETE: | |
6834 | { | |
6835 | // Lower to a runtime function call. | |
6836 | const Expression_list* args = this->args(); | |
6837 | if (args == NULL || args->size() < 2) | |
6838 | this->report_error(_("not enough arguments")); | |
6839 | else if (args->size() > 2) | |
6840 | this->report_error(_("too many arguments")); | |
6841 | else if (args->front()->type()->map_type() == NULL) | |
6842 | this->report_error(_("argument 1 must be a map")); | |
6843 | else | |
6844 | { | |
6845 | // Since this function returns no value it must appear in | |
6846 | // a statement by itself, so we don't have to worry about | |
6847 | // order of evaluation of values around it. Evaluate the | |
6848 | // map first to get order of evaluation right. | |
6849 | Map_type* mt = args->front()->type()->map_type(); | |
6850 | Temporary_statement* map_temp = | |
6851 | Statement::make_temporary(mt, args->front(), loc); | |
6852 | inserter->insert(map_temp); | |
6853 | ||
6854 | Temporary_statement* key_temp = | |
6855 | Statement::make_temporary(mt->key_type(), args->back(), loc); | |
6856 | inserter->insert(key_temp); | |
6857 | ||
6858 | Expression* e1 = Expression::make_temporary_reference(map_temp, | |
6859 | loc); | |
6860 | Expression* e2 = Expression::make_temporary_reference(key_temp, | |
6861 | loc); | |
6862 | e2 = Expression::make_unary(OPERATOR_AND, e2, loc); | |
6863 | return Runtime::make_call(Runtime::MAPDELETE, this->location(), | |
6864 | 2, e1, e2); | |
6865 | } | |
6866 | } | |
6867 | break; | |
e440a328 | 6868 | } |
6869 | ||
6870 | return this; | |
6871 | } | |
6872 | ||
35a54f17 | 6873 | // Flatten a builtin call expression. This turns the arguments of copy and |
6874 | // append into temporary expressions. | |
6875 | ||
6876 | Expression* | |
6877 | Builtin_call_expression::do_flatten(Gogo*, Named_object*, | |
6878 | Statement_inserter* inserter) | |
6879 | { | |
6880 | if (this->code_ == BUILTIN_APPEND | |
6881 | || this->code_ == BUILTIN_COPY) | |
6882 | { | |
6883 | Location loc = this->location(); | |
6884 | Type* at = this->args()->front()->type(); | |
6885 | for (Expression_list::iterator pa = this->args()->begin(); | |
6886 | pa != this->args()->end(); | |
6887 | ++pa) | |
6888 | { | |
6889 | if ((*pa)->is_nil_expression()) | |
55e8ba6a | 6890 | { |
6891 | Expression* nil = Expression::make_nil(loc); | |
6892 | Expression* zero = Expression::make_integer_ul(0, NULL, loc); | |
6893 | *pa = Expression::make_slice_value(at, nil, zero, zero, loc); | |
6894 | } | |
35a54f17 | 6895 | if (!(*pa)->is_variable()) |
6896 | { | |
6897 | Temporary_statement* temp = | |
6898 | Statement::make_temporary(NULL, *pa, loc); | |
6899 | inserter->insert(temp); | |
6900 | *pa = Expression::make_temporary_reference(temp, loc); | |
6901 | } | |
6902 | } | |
6903 | } | |
6904 | return this; | |
6905 | } | |
6906 | ||
a9182619 | 6907 | // Lower a make expression. |
6908 | ||
6909 | Expression* | |
6910 | Builtin_call_expression::lower_make() | |
6911 | { | |
b13c66cd | 6912 | Location loc = this->location(); |
a9182619 | 6913 | |
6914 | const Expression_list* args = this->args(); | |
6915 | if (args == NULL || args->size() < 1) | |
6916 | { | |
6917 | this->report_error(_("not enough arguments")); | |
6918 | return Expression::make_error(this->location()); | |
6919 | } | |
6920 | ||
6921 | Expression_list::const_iterator parg = args->begin(); | |
6922 | ||
6923 | Expression* first_arg = *parg; | |
6924 | if (!first_arg->is_type_expression()) | |
6925 | { | |
6926 | error_at(first_arg->location(), "expected type"); | |
6927 | this->set_is_error(); | |
6928 | return Expression::make_error(this->location()); | |
6929 | } | |
6930 | Type* type = first_arg->type(); | |
6931 | ||
6932 | bool is_slice = false; | |
6933 | bool is_map = false; | |
6934 | bool is_chan = false; | |
411eb89e | 6935 | if (type->is_slice_type()) |
a9182619 | 6936 | is_slice = true; |
6937 | else if (type->map_type() != NULL) | |
6938 | is_map = true; | |
6939 | else if (type->channel_type() != NULL) | |
6940 | is_chan = true; | |
6941 | else | |
6942 | { | |
6943 | this->report_error(_("invalid type for make function")); | |
6944 | return Expression::make_error(this->location()); | |
6945 | } | |
6946 | ||
ac84c822 | 6947 | bool have_big_args = false; |
6948 | Type* uintptr_type = Type::lookup_integer_type("uintptr"); | |
6949 | int uintptr_bits = uintptr_type->integer_type()->bits(); | |
6950 | ||
f6bc81e6 | 6951 | Type_context int_context(Type::lookup_integer_type("int"), false); |
6952 | ||
a9182619 | 6953 | ++parg; |
6954 | Expression* len_arg; | |
6955 | if (parg == args->end()) | |
6956 | { | |
6957 | if (is_slice) | |
6958 | { | |
6959 | this->report_error(_("length required when allocating a slice")); | |
6960 | return Expression::make_error(this->location()); | |
6961 | } | |
e67508fa | 6962 | len_arg = Expression::make_integer_ul(0, NULL, loc); |
a9182619 | 6963 | } |
6964 | else | |
6965 | { | |
6966 | len_arg = *parg; | |
f6bc81e6 | 6967 | len_arg->determine_type(&int_context); |
1ad00fd4 | 6968 | if (!this->check_int_value(len_arg, true)) |
6969 | return Expression::make_error(this->location()); | |
ac84c822 | 6970 | if (len_arg->type()->integer_type() != NULL |
6971 | && len_arg->type()->integer_type()->bits() > uintptr_bits) | |
6972 | have_big_args = true; | |
a9182619 | 6973 | ++parg; |
6974 | } | |
6975 | ||
6976 | Expression* cap_arg = NULL; | |
6977 | if (is_slice && parg != args->end()) | |
6978 | { | |
6979 | cap_arg = *parg; | |
f6bc81e6 | 6980 | cap_arg->determine_type(&int_context); |
1ad00fd4 | 6981 | if (!this->check_int_value(cap_arg, false)) |
6982 | return Expression::make_error(this->location()); | |
6983 | ||
6984 | Numeric_constant nclen; | |
6985 | Numeric_constant nccap; | |
6986 | unsigned long vlen; | |
6987 | unsigned long vcap; | |
6988 | if (len_arg->numeric_constant_value(&nclen) | |
6989 | && cap_arg->numeric_constant_value(&nccap) | |
6990 | && nclen.to_unsigned_long(&vlen) == Numeric_constant::NC_UL_VALID | |
6991 | && nccap.to_unsigned_long(&vcap) == Numeric_constant::NC_UL_VALID | |
6992 | && vlen > vcap) | |
a9182619 | 6993 | { |
1ad00fd4 | 6994 | this->report_error(_("len larger than cap")); |
a9182619 | 6995 | return Expression::make_error(this->location()); |
6996 | } | |
1ad00fd4 | 6997 | |
ac84c822 | 6998 | if (cap_arg->type()->integer_type() != NULL |
6999 | && cap_arg->type()->integer_type()->bits() > uintptr_bits) | |
7000 | have_big_args = true; | |
a9182619 | 7001 | ++parg; |
7002 | } | |
7003 | ||
7004 | if (parg != args->end()) | |
7005 | { | |
7006 | this->report_error(_("too many arguments to make")); | |
7007 | return Expression::make_error(this->location()); | |
7008 | } | |
7009 | ||
b13c66cd | 7010 | Location type_loc = first_arg->location(); |
a9182619 | 7011 | Expression* type_arg; |
7012 | if (is_slice || is_chan) | |
7013 | type_arg = Expression::make_type_descriptor(type, type_loc); | |
7014 | else if (is_map) | |
7015 | type_arg = Expression::make_map_descriptor(type->map_type(), type_loc); | |
7016 | else | |
7017 | go_unreachable(); | |
7018 | ||
7019 | Expression* call; | |
7020 | if (is_slice) | |
7021 | { | |
7022 | if (cap_arg == NULL) | |
ac84c822 | 7023 | call = Runtime::make_call((have_big_args |
7024 | ? Runtime::MAKESLICE1BIG | |
7025 | : Runtime::MAKESLICE1), | |
7026 | loc, 2, type_arg, len_arg); | |
a9182619 | 7027 | else |
ac84c822 | 7028 | call = Runtime::make_call((have_big_args |
7029 | ? Runtime::MAKESLICE2BIG | |
7030 | : Runtime::MAKESLICE2), | |
7031 | loc, 3, type_arg, len_arg, cap_arg); | |
a9182619 | 7032 | } |
7033 | else if (is_map) | |
ac84c822 | 7034 | call = Runtime::make_call((have_big_args |
7035 | ? Runtime::MAKEMAPBIG | |
7036 | : Runtime::MAKEMAP), | |
7037 | loc, 2, type_arg, len_arg); | |
a9182619 | 7038 | else if (is_chan) |
ac84c822 | 7039 | call = Runtime::make_call((have_big_args |
7040 | ? Runtime::MAKECHANBIG | |
7041 | : Runtime::MAKECHAN), | |
7042 | loc, 2, type_arg, len_arg); | |
a9182619 | 7043 | else |
7044 | go_unreachable(); | |
7045 | ||
7046 | return Expression::make_unsafe_cast(type, call, loc); | |
7047 | } | |
7048 | ||
7049 | // Return whether an expression has an integer value. Report an error | |
7050 | // if not. This is used when handling calls to the predeclared make | |
7051 | // function. | |
7052 | ||
7053 | bool | |
1ad00fd4 | 7054 | Builtin_call_expression::check_int_value(Expression* e, bool is_length) |
a9182619 | 7055 | { |
0c77715b | 7056 | Numeric_constant nc; |
1ad00fd4 | 7057 | if (e->numeric_constant_value(&nc)) |
a9182619 | 7058 | { |
1ad00fd4 | 7059 | unsigned long v; |
7060 | switch (nc.to_unsigned_long(&v)) | |
7061 | { | |
7062 | case Numeric_constant::NC_UL_VALID: | |
1b10c5e7 | 7063 | break; |
1ad00fd4 | 7064 | case Numeric_constant::NC_UL_NOTINT: |
7065 | error_at(e->location(), "non-integer %s argument to make", | |
7066 | is_length ? "len" : "cap"); | |
7067 | return false; | |
7068 | case Numeric_constant::NC_UL_NEGATIVE: | |
7069 | error_at(e->location(), "negative %s argument to make", | |
7070 | is_length ? "len" : "cap"); | |
7071 | return false; | |
7072 | case Numeric_constant::NC_UL_BIG: | |
7073 | // We don't want to give a compile-time error for a 64-bit | |
7074 | // value on a 32-bit target. | |
1b10c5e7 | 7075 | break; |
1ad00fd4 | 7076 | } |
1b10c5e7 | 7077 | |
7078 | mpz_t val; | |
7079 | if (!nc.to_int(&val)) | |
7080 | go_unreachable(); | |
7081 | int bits = mpz_sizeinbase(val, 2); | |
7082 | mpz_clear(val); | |
7083 | Type* int_type = Type::lookup_integer_type("int"); | |
7084 | if (bits >= int_type->integer_type()->bits()) | |
7085 | { | |
7086 | error_at(e->location(), "%s argument too large for make", | |
7087 | is_length ? "len" : "cap"); | |
7088 | return false; | |
7089 | } | |
7090 | ||
7091 | return true; | |
a9182619 | 7092 | } |
7093 | ||
1ad00fd4 | 7094 | if (e->type()->integer_type() != NULL) |
7095 | return true; | |
7096 | ||
7097 | error_at(e->location(), "non-integer %s argument to make", | |
7098 | is_length ? "len" : "cap"); | |
a9182619 | 7099 | return false; |
7100 | } | |
7101 | ||
e440a328 | 7102 | // Return the type of the real or imag functions, given the type of |
fcbea5e4 | 7103 | // the argument. We need to map complex64 to float32 and complex128 |
7104 | // to float64, so it has to be done by name. This returns NULL if it | |
7105 | // can't figure out the type. | |
e440a328 | 7106 | |
7107 | Type* | |
7108 | Builtin_call_expression::real_imag_type(Type* arg_type) | |
7109 | { | |
7110 | if (arg_type == NULL || arg_type->is_abstract()) | |
7111 | return NULL; | |
7112 | Named_type* nt = arg_type->named_type(); | |
7113 | if (nt == NULL) | |
7114 | return NULL; | |
7115 | while (nt->real_type()->named_type() != NULL) | |
7116 | nt = nt->real_type()->named_type(); | |
48080209 | 7117 | if (nt->name() == "complex64") |
e440a328 | 7118 | return Type::lookup_float_type("float32"); |
7119 | else if (nt->name() == "complex128") | |
7120 | return Type::lookup_float_type("float64"); | |
7121 | else | |
7122 | return NULL; | |
7123 | } | |
7124 | ||
48080209 | 7125 | // Return the type of the complex function, given the type of one of the |
e440a328 | 7126 | // argments. Like real_imag_type, we have to map by name. |
7127 | ||
7128 | Type* | |
48080209 | 7129 | Builtin_call_expression::complex_type(Type* arg_type) |
e440a328 | 7130 | { |
7131 | if (arg_type == NULL || arg_type->is_abstract()) | |
7132 | return NULL; | |
7133 | Named_type* nt = arg_type->named_type(); | |
7134 | if (nt == NULL) | |
7135 | return NULL; | |
7136 | while (nt->real_type()->named_type() != NULL) | |
7137 | nt = nt->real_type()->named_type(); | |
48080209 | 7138 | if (nt->name() == "float32") |
e440a328 | 7139 | return Type::lookup_complex_type("complex64"); |
7140 | else if (nt->name() == "float64") | |
7141 | return Type::lookup_complex_type("complex128"); | |
7142 | else | |
7143 | return NULL; | |
7144 | } | |
7145 | ||
7146 | // Return a single argument, or NULL if there isn't one. | |
7147 | ||
7148 | Expression* | |
7149 | Builtin_call_expression::one_arg() const | |
7150 | { | |
7151 | const Expression_list* args = this->args(); | |
aa615cb3 | 7152 | if (args == NULL || args->size() != 1) |
e440a328 | 7153 | return NULL; |
7154 | return args->front(); | |
7155 | } | |
7156 | ||
83921647 | 7157 | // A traversal class which looks for a call or receive expression. |
7158 | ||
7159 | class Find_call_expression : public Traverse | |
7160 | { | |
7161 | public: | |
7162 | Find_call_expression() | |
7163 | : Traverse(traverse_expressions), | |
7164 | found_(false) | |
7165 | { } | |
7166 | ||
7167 | int | |
7168 | expression(Expression**); | |
7169 | ||
7170 | bool | |
7171 | found() | |
7172 | { return this->found_; } | |
7173 | ||
7174 | private: | |
7175 | bool found_; | |
7176 | }; | |
7177 | ||
7178 | int | |
7179 | Find_call_expression::expression(Expression** pexpr) | |
7180 | { | |
7181 | if ((*pexpr)->call_expression() != NULL | |
7182 | || (*pexpr)->receive_expression() != NULL) | |
7183 | { | |
7184 | this->found_ = true; | |
7185 | return TRAVERSE_EXIT; | |
7186 | } | |
7187 | return TRAVERSE_CONTINUE; | |
7188 | } | |
7189 | ||
7190 | // Return whether this is constant: len of a string constant, or len | |
7191 | // or cap of an array, or unsafe.Sizeof, unsafe.Offsetof, | |
7192 | // unsafe.Alignof. | |
e440a328 | 7193 | |
7194 | bool | |
7195 | Builtin_call_expression::do_is_constant() const | |
7196 | { | |
12e69faa | 7197 | if (this->is_error_expression()) |
7198 | return true; | |
e440a328 | 7199 | switch (this->code_) |
7200 | { | |
7201 | case BUILTIN_LEN: | |
7202 | case BUILTIN_CAP: | |
7203 | { | |
0f914071 | 7204 | if (this->seen_) |
7205 | return false; | |
7206 | ||
e440a328 | 7207 | Expression* arg = this->one_arg(); |
7208 | if (arg == NULL) | |
7209 | return false; | |
7210 | Type* arg_type = arg->type(); | |
7211 | ||
7212 | if (arg_type->points_to() != NULL | |
7213 | && arg_type->points_to()->array_type() != NULL | |
411eb89e | 7214 | && !arg_type->points_to()->is_slice_type()) |
e440a328 | 7215 | arg_type = arg_type->points_to(); |
7216 | ||
83921647 | 7217 | // The len and cap functions are only constant if there are no |
7218 | // function calls or channel operations in the arguments. | |
7219 | // Otherwise we have to make the call. | |
7220 | if (!arg->is_constant()) | |
7221 | { | |
7222 | Find_call_expression find_call; | |
7223 | Expression::traverse(&arg, &find_call); | |
7224 | if (find_call.found()) | |
7225 | return false; | |
7226 | } | |
7227 | ||
e440a328 | 7228 | if (arg_type->array_type() != NULL |
7229 | && arg_type->array_type()->length() != NULL) | |
0f914071 | 7230 | return true; |
e440a328 | 7231 | |
7232 | if (this->code_ == BUILTIN_LEN && arg_type->is_string_type()) | |
0f914071 | 7233 | { |
7234 | this->seen_ = true; | |
7235 | bool ret = arg->is_constant(); | |
7236 | this->seen_ = false; | |
7237 | return ret; | |
7238 | } | |
e440a328 | 7239 | } |
7240 | break; | |
7241 | ||
7242 | case BUILTIN_SIZEOF: | |
7243 | case BUILTIN_ALIGNOF: | |
7244 | return this->one_arg() != NULL; | |
7245 | ||
7246 | case BUILTIN_OFFSETOF: | |
7247 | { | |
7248 | Expression* arg = this->one_arg(); | |
7249 | if (arg == NULL) | |
7250 | return false; | |
7251 | return arg->field_reference_expression() != NULL; | |
7252 | } | |
7253 | ||
48080209 | 7254 | case BUILTIN_COMPLEX: |
e440a328 | 7255 | { |
7256 | const Expression_list* args = this->args(); | |
7257 | if (args != NULL && args->size() == 2) | |
7258 | return args->front()->is_constant() && args->back()->is_constant(); | |
7259 | } | |
7260 | break; | |
7261 | ||
7262 | case BUILTIN_REAL: | |
7263 | case BUILTIN_IMAG: | |
7264 | { | |
7265 | Expression* arg = this->one_arg(); | |
7266 | return arg != NULL && arg->is_constant(); | |
7267 | } | |
7268 | ||
7269 | default: | |
7270 | break; | |
7271 | } | |
7272 | ||
7273 | return false; | |
7274 | } | |
7275 | ||
0c77715b | 7276 | // Return a numeric constant if possible. |
e440a328 | 7277 | |
7278 | bool | |
0c77715b | 7279 | Builtin_call_expression::do_numeric_constant_value(Numeric_constant* nc) const |
e440a328 | 7280 | { |
7281 | if (this->code_ == BUILTIN_LEN | |
7282 | || this->code_ == BUILTIN_CAP) | |
7283 | { | |
7284 | Expression* arg = this->one_arg(); | |
7285 | if (arg == NULL) | |
7286 | return false; | |
7287 | Type* arg_type = arg->type(); | |
7288 | ||
7289 | if (this->code_ == BUILTIN_LEN && arg_type->is_string_type()) | |
7290 | { | |
7291 | std::string sval; | |
7292 | if (arg->string_constant_value(&sval)) | |
7293 | { | |
0c77715b | 7294 | nc->set_unsigned_long(Type::lookup_integer_type("int"), |
7295 | sval.length()); | |
e440a328 | 7296 | return true; |
7297 | } | |
7298 | } | |
7299 | ||
7300 | if (arg_type->points_to() != NULL | |
7301 | && arg_type->points_to()->array_type() != NULL | |
411eb89e | 7302 | && !arg_type->points_to()->is_slice_type()) |
e440a328 | 7303 | arg_type = arg_type->points_to(); |
7304 | ||
7305 | if (arg_type->array_type() != NULL | |
7306 | && arg_type->array_type()->length() != NULL) | |
7307 | { | |
0f914071 | 7308 | if (this->seen_) |
7309 | return false; | |
e440a328 | 7310 | Expression* e = arg_type->array_type()->length(); |
0f914071 | 7311 | this->seen_ = true; |
0c77715b | 7312 | bool r = e->numeric_constant_value(nc); |
0f914071 | 7313 | this->seen_ = false; |
7314 | if (r) | |
e440a328 | 7315 | { |
0c77715b | 7316 | if (!nc->set_type(Type::lookup_integer_type("int"), false, |
7317 | this->location())) | |
7318 | r = false; | |
e440a328 | 7319 | } |
0c77715b | 7320 | return r; |
e440a328 | 7321 | } |
7322 | } | |
7323 | else if (this->code_ == BUILTIN_SIZEOF | |
7324 | || this->code_ == BUILTIN_ALIGNOF) | |
7325 | { | |
7326 | Expression* arg = this->one_arg(); | |
7327 | if (arg == NULL) | |
7328 | return false; | |
7329 | Type* arg_type = arg->type(); | |
5c13bd80 | 7330 | if (arg_type->is_error()) |
e440a328 | 7331 | return false; |
7332 | if (arg_type->is_abstract()) | |
7333 | return false; | |
2c809f8f | 7334 | if (this->seen_) |
7335 | return false; | |
927a01eb | 7336 | |
5892f89f | 7337 | unsigned long ret; |
e440a328 | 7338 | if (this->code_ == BUILTIN_SIZEOF) |
7339 | { | |
2c809f8f | 7340 | this->seen_ = true; |
7341 | bool ok = arg_type->backend_type_size(this->gogo_, &ret); | |
7342 | this->seen_ = false; | |
7343 | if (!ok) | |
e440a328 | 7344 | return false; |
7345 | } | |
7346 | else if (this->code_ == BUILTIN_ALIGNOF) | |
7347 | { | |
2c809f8f | 7348 | bool ok; |
7349 | this->seen_ = true; | |
637bd3af | 7350 | if (arg->field_reference_expression() == NULL) |
2c809f8f | 7351 | ok = arg_type->backend_type_align(this->gogo_, &ret); |
637bd3af | 7352 | else |
e440a328 | 7353 | { |
7354 | // Calling unsafe.Alignof(s.f) returns the alignment of | |
7355 | // the type of f when it is used as a field in a struct. | |
2c809f8f | 7356 | ok = arg_type->backend_type_field_align(this->gogo_, &ret); |
e440a328 | 7357 | } |
2c809f8f | 7358 | this->seen_ = false; |
7359 | if (!ok) | |
7360 | return false; | |
e440a328 | 7361 | } |
7362 | else | |
c3e6f413 | 7363 | go_unreachable(); |
927a01eb | 7364 | |
5892f89f | 7365 | nc->set_unsigned_long(Type::lookup_integer_type("uintptr"), ret); |
e440a328 | 7366 | return true; |
7367 | } | |
7368 | else if (this->code_ == BUILTIN_OFFSETOF) | |
7369 | { | |
7370 | Expression* arg = this->one_arg(); | |
7371 | if (arg == NULL) | |
7372 | return false; | |
7373 | Field_reference_expression* farg = arg->field_reference_expression(); | |
7374 | if (farg == NULL) | |
7375 | return false; | |
2c809f8f | 7376 | if (this->seen_) |
7377 | return false; | |
7378 | ||
9a4bd570 | 7379 | unsigned int total_offset = 0; |
7380 | while (true) | |
7381 | { | |
7382 | Expression* struct_expr = farg->expr(); | |
7383 | Type* st = struct_expr->type(); | |
7384 | if (st->struct_type() == NULL) | |
7385 | return false; | |
7386 | if (st->named_type() != NULL) | |
7387 | st->named_type()->convert(this->gogo_); | |
7388 | unsigned int offset; | |
2c809f8f | 7389 | this->seen_ = true; |
7390 | bool ok = st->struct_type()->backend_field_offset(this->gogo_, | |
7391 | farg->field_index(), | |
7392 | &offset); | |
7393 | this->seen_ = false; | |
7394 | if (!ok) | |
7395 | return false; | |
9a4bd570 | 7396 | total_offset += offset; |
7397 | if (farg->implicit() && struct_expr->field_reference_expression() != NULL) | |
7398 | { | |
7399 | // Go up until we reach the original base. | |
7400 | farg = struct_expr->field_reference_expression(); | |
7401 | continue; | |
7402 | } | |
7403 | break; | |
7404 | } | |
7ba86326 | 7405 | nc->set_unsigned_long(Type::lookup_integer_type("uintptr"), |
9a4bd570 | 7406 | static_cast<unsigned long>(total_offset)); |
e440a328 | 7407 | return true; |
7408 | } | |
0c77715b | 7409 | else if (this->code_ == BUILTIN_REAL || this->code_ == BUILTIN_IMAG) |
e440a328 | 7410 | { |
7411 | Expression* arg = this->one_arg(); | |
7412 | if (arg == NULL) | |
7413 | return false; | |
7414 | ||
0c77715b | 7415 | Numeric_constant argnc; |
7416 | if (!arg->numeric_constant_value(&argnc)) | |
7417 | return false; | |
7418 | ||
fcbea5e4 | 7419 | mpc_t val; |
7420 | if (!argnc.to_complex(&val)) | |
0c77715b | 7421 | return false; |
e440a328 | 7422 | |
0c77715b | 7423 | Type* type = Builtin_call_expression::real_imag_type(argnc.type()); |
7424 | if (this->code_ == BUILTIN_REAL) | |
fcbea5e4 | 7425 | nc->set_float(type, mpc_realref(val)); |
0c77715b | 7426 | else |
fcbea5e4 | 7427 | nc->set_float(type, mpc_imagref(val)); |
7428 | mpc_clear(val); | |
0c77715b | 7429 | return true; |
e440a328 | 7430 | } |
0c77715b | 7431 | else if (this->code_ == BUILTIN_COMPLEX) |
e440a328 | 7432 | { |
7433 | const Expression_list* args = this->args(); | |
7434 | if (args == NULL || args->size() != 2) | |
7435 | return false; | |
7436 | ||
0c77715b | 7437 | Numeric_constant rnc; |
7438 | if (!args->front()->numeric_constant_value(&rnc)) | |
7439 | return false; | |
7440 | Numeric_constant inc; | |
7441 | if (!args->back()->numeric_constant_value(&inc)) | |
7442 | return false; | |
7443 | ||
7444 | if (rnc.type() != NULL | |
7445 | && !rnc.type()->is_abstract() | |
7446 | && inc.type() != NULL | |
7447 | && !inc.type()->is_abstract() | |
7448 | && !Type::are_identical(rnc.type(), inc.type(), false, NULL)) | |
7449 | return false; | |
7450 | ||
e440a328 | 7451 | mpfr_t r; |
0c77715b | 7452 | if (!rnc.to_float(&r)) |
7453 | return false; | |
7454 | mpfr_t i; | |
7455 | if (!inc.to_float(&i)) | |
e440a328 | 7456 | { |
7457 | mpfr_clear(r); | |
7458 | return false; | |
7459 | } | |
7460 | ||
0c77715b | 7461 | Type* arg_type = rnc.type(); |
7462 | if (arg_type == NULL || arg_type->is_abstract()) | |
7463 | arg_type = inc.type(); | |
e440a328 | 7464 | |
fcbea5e4 | 7465 | mpc_t val; |
7466 | mpc_init2(val, mpc_precision); | |
7467 | mpc_set_fr_fr(val, r, i, MPC_RNDNN); | |
e440a328 | 7468 | mpfr_clear(r); |
7469 | mpfr_clear(i); | |
7470 | ||
fcbea5e4 | 7471 | Type* type = Builtin_call_expression::complex_type(arg_type); |
7472 | nc->set_complex(type, val); | |
7473 | ||
7474 | mpc_clear(val); | |
7475 | ||
0c77715b | 7476 | return true; |
e440a328 | 7477 | } |
7478 | ||
7479 | return false; | |
7480 | } | |
7481 | ||
a7549a6a | 7482 | // Give an error if we are discarding the value of an expression which |
7483 | // should not normally be discarded. We don't give an error for | |
7484 | // discarding the value of an ordinary function call, but we do for | |
7485 | // builtin functions, purely for consistency with the gc compiler. | |
7486 | ||
4f2138d7 | 7487 | bool |
a7549a6a | 7488 | Builtin_call_expression::do_discarding_value() |
7489 | { | |
7490 | switch (this->code_) | |
7491 | { | |
7492 | case BUILTIN_INVALID: | |
7493 | default: | |
7494 | go_unreachable(); | |
7495 | ||
7496 | case BUILTIN_APPEND: | |
7497 | case BUILTIN_CAP: | |
7498 | case BUILTIN_COMPLEX: | |
7499 | case BUILTIN_IMAG: | |
7500 | case BUILTIN_LEN: | |
7501 | case BUILTIN_MAKE: | |
7502 | case BUILTIN_NEW: | |
7503 | case BUILTIN_REAL: | |
7504 | case BUILTIN_ALIGNOF: | |
7505 | case BUILTIN_OFFSETOF: | |
7506 | case BUILTIN_SIZEOF: | |
7507 | this->unused_value_error(); | |
4f2138d7 | 7508 | return false; |
a7549a6a | 7509 | |
7510 | case BUILTIN_CLOSE: | |
7511 | case BUILTIN_COPY: | |
1cce762f | 7512 | case BUILTIN_DELETE: |
a7549a6a | 7513 | case BUILTIN_PANIC: |
7514 | case BUILTIN_PRINT: | |
7515 | case BUILTIN_PRINTLN: | |
7516 | case BUILTIN_RECOVER: | |
4f2138d7 | 7517 | return true; |
a7549a6a | 7518 | } |
7519 | } | |
7520 | ||
e440a328 | 7521 | // Return the type. |
7522 | ||
7523 | Type* | |
7524 | Builtin_call_expression::do_type() | |
7525 | { | |
7526 | switch (this->code_) | |
7527 | { | |
7528 | case BUILTIN_INVALID: | |
7529 | default: | |
c3e6f413 | 7530 | go_unreachable(); |
e440a328 | 7531 | |
7532 | case BUILTIN_NEW: | |
7533 | case BUILTIN_MAKE: | |
7534 | { | |
7535 | const Expression_list* args = this->args(); | |
7536 | if (args == NULL || args->empty()) | |
7537 | return Type::make_error_type(); | |
7538 | return Type::make_pointer_type(args->front()->type()); | |
7539 | } | |
7540 | ||
7541 | case BUILTIN_CAP: | |
7542 | case BUILTIN_COPY: | |
7543 | case BUILTIN_LEN: | |
7ba86326 | 7544 | return Type::lookup_integer_type("int"); |
7545 | ||
e440a328 | 7546 | case BUILTIN_ALIGNOF: |
7547 | case BUILTIN_OFFSETOF: | |
7548 | case BUILTIN_SIZEOF: | |
7ba86326 | 7549 | return Type::lookup_integer_type("uintptr"); |
e440a328 | 7550 | |
7551 | case BUILTIN_CLOSE: | |
1cce762f | 7552 | case BUILTIN_DELETE: |
e440a328 | 7553 | case BUILTIN_PANIC: |
7554 | case BUILTIN_PRINT: | |
7555 | case BUILTIN_PRINTLN: | |
7556 | return Type::make_void_type(); | |
7557 | ||
e440a328 | 7558 | case BUILTIN_RECOVER: |
823c7e3d | 7559 | return Type::make_empty_interface_type(Linemap::predeclared_location()); |
e440a328 | 7560 | |
7561 | case BUILTIN_APPEND: | |
7562 | { | |
7563 | const Expression_list* args = this->args(); | |
7564 | if (args == NULL || args->empty()) | |
7565 | return Type::make_error_type(); | |
3ff4863b | 7566 | Type *ret = args->front()->type(); |
7567 | if (!ret->is_slice_type()) | |
7568 | return Type::make_error_type(); | |
7569 | return ret; | |
e440a328 | 7570 | } |
7571 | ||
7572 | case BUILTIN_REAL: | |
7573 | case BUILTIN_IMAG: | |
7574 | { | |
7575 | Expression* arg = this->one_arg(); | |
7576 | if (arg == NULL) | |
7577 | return Type::make_error_type(); | |
7578 | Type* t = arg->type(); | |
7579 | if (t->is_abstract()) | |
7580 | t = t->make_non_abstract_type(); | |
7581 | t = Builtin_call_expression::real_imag_type(t); | |
7582 | if (t == NULL) | |
7583 | t = Type::make_error_type(); | |
7584 | return t; | |
7585 | } | |
7586 | ||
48080209 | 7587 | case BUILTIN_COMPLEX: |
e440a328 | 7588 | { |
7589 | const Expression_list* args = this->args(); | |
7590 | if (args == NULL || args->size() != 2) | |
7591 | return Type::make_error_type(); | |
7592 | Type* t = args->front()->type(); | |
7593 | if (t->is_abstract()) | |
7594 | { | |
7595 | t = args->back()->type(); | |
7596 | if (t->is_abstract()) | |
7597 | t = t->make_non_abstract_type(); | |
7598 | } | |
48080209 | 7599 | t = Builtin_call_expression::complex_type(t); |
e440a328 | 7600 | if (t == NULL) |
7601 | t = Type::make_error_type(); | |
7602 | return t; | |
7603 | } | |
7604 | } | |
7605 | } | |
7606 | ||
7607 | // Determine the type. | |
7608 | ||
7609 | void | |
7610 | Builtin_call_expression::do_determine_type(const Type_context* context) | |
7611 | { | |
fb94b0ca | 7612 | if (!this->determining_types()) |
7613 | return; | |
7614 | ||
e440a328 | 7615 | this->fn()->determine_type_no_context(); |
7616 | ||
7617 | const Expression_list* args = this->args(); | |
7618 | ||
7619 | bool is_print; | |
7620 | Type* arg_type = NULL; | |
7621 | switch (this->code_) | |
7622 | { | |
7623 | case BUILTIN_PRINT: | |
7624 | case BUILTIN_PRINTLN: | |
7625 | // Do not force a large integer constant to "int". | |
7626 | is_print = true; | |
7627 | break; | |
7628 | ||
7629 | case BUILTIN_REAL: | |
7630 | case BUILTIN_IMAG: | |
48080209 | 7631 | arg_type = Builtin_call_expression::complex_type(context->type); |
f6bc81e6 | 7632 | if (arg_type == NULL) |
7633 | arg_type = Type::lookup_complex_type("complex128"); | |
e440a328 | 7634 | is_print = false; |
7635 | break; | |
7636 | ||
48080209 | 7637 | case BUILTIN_COMPLEX: |
e440a328 | 7638 | { |
48080209 | 7639 | // For the complex function the type of one operand can |
e440a328 | 7640 | // determine the type of the other, as in a binary expression. |
7641 | arg_type = Builtin_call_expression::real_imag_type(context->type); | |
f6bc81e6 | 7642 | if (arg_type == NULL) |
7643 | arg_type = Type::lookup_float_type("float64"); | |
e440a328 | 7644 | if (args != NULL && args->size() == 2) |
7645 | { | |
7646 | Type* t1 = args->front()->type(); | |
c849bb59 | 7647 | Type* t2 = args->back()->type(); |
e440a328 | 7648 | if (!t1->is_abstract()) |
7649 | arg_type = t1; | |
7650 | else if (!t2->is_abstract()) | |
7651 | arg_type = t2; | |
7652 | } | |
7653 | is_print = false; | |
7654 | } | |
7655 | break; | |
7656 | ||
7657 | default: | |
7658 | is_print = false; | |
7659 | break; | |
7660 | } | |
7661 | ||
7662 | if (args != NULL) | |
7663 | { | |
7664 | for (Expression_list::const_iterator pa = args->begin(); | |
7665 | pa != args->end(); | |
7666 | ++pa) | |
7667 | { | |
7668 | Type_context subcontext; | |
7669 | subcontext.type = arg_type; | |
7670 | ||
7671 | if (is_print) | |
7672 | { | |
7673 | // We want to print large constants, we so can't just | |
7674 | // use the appropriate nonabstract type. Use uint64 for | |
7675 | // an integer if we know it is nonnegative, otherwise | |
7676 | // use int64 for a integer, otherwise use float64 for a | |
7677 | // float or complex128 for a complex. | |
7678 | Type* want_type = NULL; | |
7679 | Type* atype = (*pa)->type(); | |
7680 | if (atype->is_abstract()) | |
7681 | { | |
7682 | if (atype->integer_type() != NULL) | |
7683 | { | |
0c77715b | 7684 | Numeric_constant nc; |
7685 | if (this->numeric_constant_value(&nc)) | |
7686 | { | |
7687 | mpz_t val; | |
7688 | if (nc.to_int(&val)) | |
7689 | { | |
7690 | if (mpz_sgn(val) >= 0) | |
7691 | want_type = Type::lookup_integer_type("uint64"); | |
7692 | mpz_clear(val); | |
7693 | } | |
7694 | } | |
7695 | if (want_type == NULL) | |
e440a328 | 7696 | want_type = Type::lookup_integer_type("int64"); |
e440a328 | 7697 | } |
7698 | else if (atype->float_type() != NULL) | |
7699 | want_type = Type::lookup_float_type("float64"); | |
7700 | else if (atype->complex_type() != NULL) | |
7701 | want_type = Type::lookup_complex_type("complex128"); | |
7702 | else if (atype->is_abstract_string_type()) | |
7703 | want_type = Type::lookup_string_type(); | |
7704 | else if (atype->is_abstract_boolean_type()) | |
7705 | want_type = Type::lookup_bool_type(); | |
7706 | else | |
c3e6f413 | 7707 | go_unreachable(); |
e440a328 | 7708 | subcontext.type = want_type; |
7709 | } | |
7710 | } | |
7711 | ||
7712 | (*pa)->determine_type(&subcontext); | |
7713 | } | |
7714 | } | |
7715 | } | |
7716 | ||
7717 | // If there is exactly one argument, return true. Otherwise give an | |
7718 | // error message and return false. | |
7719 | ||
7720 | bool | |
7721 | Builtin_call_expression::check_one_arg() | |
7722 | { | |
7723 | const Expression_list* args = this->args(); | |
7724 | if (args == NULL || args->size() < 1) | |
7725 | { | |
7726 | this->report_error(_("not enough arguments")); | |
7727 | return false; | |
7728 | } | |
7729 | else if (args->size() > 1) | |
7730 | { | |
7731 | this->report_error(_("too many arguments")); | |
7732 | return false; | |
7733 | } | |
7734 | if (args->front()->is_error_expression() | |
5c13bd80 | 7735 | || args->front()->type()->is_error()) |
e440a328 | 7736 | { |
7737 | this->set_is_error(); | |
7738 | return false; | |
7739 | } | |
7740 | return true; | |
7741 | } | |
7742 | ||
7743 | // Check argument types for a builtin function. | |
7744 | ||
7745 | void | |
7746 | Builtin_call_expression::do_check_types(Gogo*) | |
7747 | { | |
375646ea | 7748 | if (this->is_error_expression()) |
7749 | return; | |
e440a328 | 7750 | switch (this->code_) |
7751 | { | |
7752 | case BUILTIN_INVALID: | |
7753 | case BUILTIN_NEW: | |
7754 | case BUILTIN_MAKE: | |
cd238b8d | 7755 | case BUILTIN_DELETE: |
e440a328 | 7756 | return; |
7757 | ||
7758 | case BUILTIN_LEN: | |
7759 | case BUILTIN_CAP: | |
7760 | { | |
7761 | // The single argument may be either a string or an array or a | |
7762 | // map or a channel, or a pointer to a closed array. | |
7763 | if (this->check_one_arg()) | |
7764 | { | |
7765 | Type* arg_type = this->one_arg()->type(); | |
7766 | if (arg_type->points_to() != NULL | |
7767 | && arg_type->points_to()->array_type() != NULL | |
411eb89e | 7768 | && !arg_type->points_to()->is_slice_type()) |
e440a328 | 7769 | arg_type = arg_type->points_to(); |
7770 | if (this->code_ == BUILTIN_CAP) | |
7771 | { | |
5c13bd80 | 7772 | if (!arg_type->is_error() |
e440a328 | 7773 | && arg_type->array_type() == NULL |
7774 | && arg_type->channel_type() == NULL) | |
7775 | this->report_error(_("argument must be array or slice " | |
7776 | "or channel")); | |
7777 | } | |
7778 | else | |
7779 | { | |
5c13bd80 | 7780 | if (!arg_type->is_error() |
e440a328 | 7781 | && !arg_type->is_string_type() |
7782 | && arg_type->array_type() == NULL | |
7783 | && arg_type->map_type() == NULL | |
7784 | && arg_type->channel_type() == NULL) | |
7785 | this->report_error(_("argument must be string or " | |
7786 | "array or slice or map or channel")); | |
7787 | } | |
7788 | } | |
7789 | } | |
7790 | break; | |
7791 | ||
7792 | case BUILTIN_PRINT: | |
7793 | case BUILTIN_PRINTLN: | |
7794 | { | |
7795 | const Expression_list* args = this->args(); | |
7796 | if (args == NULL) | |
7797 | { | |
7798 | if (this->code_ == BUILTIN_PRINT) | |
7799 | warning_at(this->location(), 0, | |
7800 | "no arguments for builtin function %<%s%>", | |
7801 | (this->code_ == BUILTIN_PRINT | |
7802 | ? "print" | |
7803 | : "println")); | |
7804 | } | |
7805 | else | |
7806 | { | |
7807 | for (Expression_list::const_iterator p = args->begin(); | |
7808 | p != args->end(); | |
7809 | ++p) | |
7810 | { | |
7811 | Type* type = (*p)->type(); | |
5c13bd80 | 7812 | if (type->is_error() |
e440a328 | 7813 | || type->is_string_type() |
7814 | || type->integer_type() != NULL | |
7815 | || type->float_type() != NULL | |
7816 | || type->complex_type() != NULL | |
7817 | || type->is_boolean_type() | |
7818 | || type->points_to() != NULL | |
7819 | || type->interface_type() != NULL | |
7820 | || type->channel_type() != NULL | |
7821 | || type->map_type() != NULL | |
7822 | || type->function_type() != NULL | |
411eb89e | 7823 | || type->is_slice_type()) |
e440a328 | 7824 | ; |
acf8e158 | 7825 | else if ((*p)->is_type_expression()) |
7826 | { | |
7827 | // If this is a type expression it's going to give | |
7828 | // an error anyhow, so we don't need one here. | |
7829 | } | |
e440a328 | 7830 | else |
7831 | this->report_error(_("unsupported argument type to " | |
7832 | "builtin function")); | |
7833 | } | |
7834 | } | |
7835 | } | |
7836 | break; | |
7837 | ||
7838 | case BUILTIN_CLOSE: | |
e440a328 | 7839 | if (this->check_one_arg()) |
7840 | { | |
7841 | if (this->one_arg()->type()->channel_type() == NULL) | |
7842 | this->report_error(_("argument must be channel")); | |
5202d986 | 7843 | else if (!this->one_arg()->type()->channel_type()->may_send()) |
7844 | this->report_error(_("cannot close receive-only channel")); | |
e440a328 | 7845 | } |
7846 | break; | |
7847 | ||
7848 | case BUILTIN_PANIC: | |
7849 | case BUILTIN_SIZEOF: | |
7850 | case BUILTIN_ALIGNOF: | |
7851 | this->check_one_arg(); | |
7852 | break; | |
7853 | ||
7854 | case BUILTIN_RECOVER: | |
6334270b | 7855 | if (this->args() != NULL |
7856 | && !this->args()->empty() | |
7857 | && !this->recover_arg_is_set_) | |
e440a328 | 7858 | this->report_error(_("too many arguments")); |
7859 | break; | |
7860 | ||
7861 | case BUILTIN_OFFSETOF: | |
7862 | if (this->check_one_arg()) | |
7863 | { | |
7864 | Expression* arg = this->one_arg(); | |
7865 | if (arg->field_reference_expression() == NULL) | |
7866 | this->report_error(_("argument must be a field reference")); | |
7867 | } | |
7868 | break; | |
7869 | ||
7870 | case BUILTIN_COPY: | |
7871 | { | |
7872 | const Expression_list* args = this->args(); | |
7873 | if (args == NULL || args->size() < 2) | |
7874 | { | |
7875 | this->report_error(_("not enough arguments")); | |
7876 | break; | |
7877 | } | |
7878 | else if (args->size() > 2) | |
7879 | { | |
7880 | this->report_error(_("too many arguments")); | |
7881 | break; | |
7882 | } | |
7883 | Type* arg1_type = args->front()->type(); | |
7884 | Type* arg2_type = args->back()->type(); | |
5c13bd80 | 7885 | if (arg1_type->is_error() || arg2_type->is_error()) |
e440a328 | 7886 | break; |
7887 | ||
7888 | Type* e1; | |
411eb89e | 7889 | if (arg1_type->is_slice_type()) |
e440a328 | 7890 | e1 = arg1_type->array_type()->element_type(); |
7891 | else | |
7892 | { | |
7893 | this->report_error(_("left argument must be a slice")); | |
7894 | break; | |
7895 | } | |
7896 | ||
411eb89e | 7897 | if (arg2_type->is_slice_type()) |
60963afd | 7898 | { |
7899 | Type* e2 = arg2_type->array_type()->element_type(); | |
7900 | if (!Type::are_identical(e1, e2, true, NULL)) | |
7901 | this->report_error(_("element types must be the same")); | |
7902 | } | |
e440a328 | 7903 | else if (arg2_type->is_string_type()) |
e440a328 | 7904 | { |
60963afd | 7905 | if (e1->integer_type() == NULL || !e1->integer_type()->is_byte()) |
7906 | this->report_error(_("first argument must be []byte")); | |
e440a328 | 7907 | } |
60963afd | 7908 | else |
7909 | this->report_error(_("second argument must be slice or string")); | |
e440a328 | 7910 | } |
7911 | break; | |
7912 | ||
7913 | case BUILTIN_APPEND: | |
7914 | { | |
7915 | const Expression_list* args = this->args(); | |
b0d311a1 | 7916 | if (args == NULL || args->size() < 2) |
e440a328 | 7917 | { |
7918 | this->report_error(_("not enough arguments")); | |
7919 | break; | |
7920 | } | |
0b7755ec | 7921 | if (args->size() > 2) |
7922 | { | |
7923 | this->report_error(_("too many arguments")); | |
7924 | break; | |
7925 | } | |
cd238b8d | 7926 | if (args->front()->type()->is_error() |
7927 | || args->back()->type()->is_error()) | |
7928 | break; | |
7929 | ||
7930 | Array_type* at = args->front()->type()->array_type(); | |
7931 | Type* e = at->element_type(); | |
4fd4fcf4 | 7932 | |
7933 | // The language permits appending a string to a []byte, as a | |
7934 | // special case. | |
7935 | if (args->back()->type()->is_string_type()) | |
7936 | { | |
60963afd | 7937 | if (e->integer_type() != NULL && e->integer_type()->is_byte()) |
4fd4fcf4 | 7938 | break; |
7939 | } | |
7940 | ||
19fd40c3 | 7941 | // The language says that the second argument must be |
7942 | // assignable to a slice of the element type of the first | |
7943 | // argument. We already know the first argument is a slice | |
7944 | // type. | |
cd238b8d | 7945 | Type* arg2_type = Type::make_array_type(e, NULL); |
e440a328 | 7946 | std::string reason; |
19fd40c3 | 7947 | if (!Type::are_assignable(arg2_type, args->back()->type(), &reason)) |
e440a328 | 7948 | { |
7949 | if (reason.empty()) | |
19fd40c3 | 7950 | this->report_error(_("argument 2 has invalid type")); |
e440a328 | 7951 | else |
7952 | { | |
19fd40c3 | 7953 | error_at(this->location(), "argument 2 has invalid type (%s)", |
e440a328 | 7954 | reason.c_str()); |
7955 | this->set_is_error(); | |
7956 | } | |
7957 | } | |
7958 | break; | |
7959 | } | |
7960 | ||
7961 | case BUILTIN_REAL: | |
7962 | case BUILTIN_IMAG: | |
7963 | if (this->check_one_arg()) | |
7964 | { | |
7965 | if (this->one_arg()->type()->complex_type() == NULL) | |
7966 | this->report_error(_("argument must have complex type")); | |
7967 | } | |
7968 | break; | |
7969 | ||
48080209 | 7970 | case BUILTIN_COMPLEX: |
e440a328 | 7971 | { |
7972 | const Expression_list* args = this->args(); | |
7973 | if (args == NULL || args->size() < 2) | |
7974 | this->report_error(_("not enough arguments")); | |
7975 | else if (args->size() > 2) | |
7976 | this->report_error(_("too many arguments")); | |
7977 | else if (args->front()->is_error_expression() | |
5c13bd80 | 7978 | || args->front()->type()->is_error() |
e440a328 | 7979 | || args->back()->is_error_expression() |
5c13bd80 | 7980 | || args->back()->type()->is_error()) |
e440a328 | 7981 | this->set_is_error(); |
7982 | else if (!Type::are_identical(args->front()->type(), | |
07ba8be5 | 7983 | args->back()->type(), true, NULL)) |
48080209 | 7984 | this->report_error(_("complex arguments must have identical types")); |
e440a328 | 7985 | else if (args->front()->type()->float_type() == NULL) |
48080209 | 7986 | this->report_error(_("complex arguments must have " |
e440a328 | 7987 | "floating-point type")); |
7988 | } | |
7989 | break; | |
7990 | ||
7991 | default: | |
c3e6f413 | 7992 | go_unreachable(); |
e440a328 | 7993 | } |
7994 | } | |
7995 | ||
72666aed | 7996 | Expression* |
7997 | Builtin_call_expression::do_copy() | |
7998 | { | |
7999 | Call_expression* bce = | |
8000 | new Builtin_call_expression(this->gogo_, this->fn()->copy(), | |
8001 | this->args()->copy(), | |
8002 | this->is_varargs(), | |
8003 | this->location()); | |
8004 | ||
8005 | if (this->varargs_are_lowered()) | |
8006 | bce->set_varargs_are_lowered(); | |
8007 | return bce; | |
8008 | } | |
8009 | ||
ea664253 | 8010 | // Return the backend representation for a builtin function. |
e440a328 | 8011 | |
ea664253 | 8012 | Bexpression* |
8013 | Builtin_call_expression::do_get_backend(Translate_context* context) | |
e440a328 | 8014 | { |
8015 | Gogo* gogo = context->gogo(); | |
b13c66cd | 8016 | Location location = this->location(); |
e440a328 | 8017 | switch (this->code_) |
8018 | { | |
8019 | case BUILTIN_INVALID: | |
8020 | case BUILTIN_NEW: | |
8021 | case BUILTIN_MAKE: | |
c3e6f413 | 8022 | go_unreachable(); |
e440a328 | 8023 | |
8024 | case BUILTIN_LEN: | |
8025 | case BUILTIN_CAP: | |
8026 | { | |
8027 | const Expression_list* args = this->args(); | |
c484d925 | 8028 | go_assert(args != NULL && args->size() == 1); |
2c809f8f | 8029 | Expression* arg = args->front(); |
e440a328 | 8030 | Type* arg_type = arg->type(); |
0f914071 | 8031 | |
8032 | if (this->seen_) | |
8033 | { | |
c484d925 | 8034 | go_assert(saw_errors()); |
ea664253 | 8035 | return context->backend()->error_expression(); |
0f914071 | 8036 | } |
8037 | this->seen_ = true; | |
0f914071 | 8038 | this->seen_ = false; |
e440a328 | 8039 | if (arg_type->points_to() != NULL) |
8040 | { | |
8041 | arg_type = arg_type->points_to(); | |
c484d925 | 8042 | go_assert(arg_type->array_type() != NULL |
411eb89e | 8043 | && !arg_type->is_slice_type()); |
2c809f8f | 8044 | arg = Expression::make_unary(OPERATOR_MULT, arg, location); |
e440a328 | 8045 | } |
8046 | ||
1b1f2abf | 8047 | Type* int_type = Type::lookup_integer_type("int"); |
2c809f8f | 8048 | Expression* val; |
e440a328 | 8049 | if (this->code_ == BUILTIN_LEN) |
8050 | { | |
8051 | if (arg_type->is_string_type()) | |
2c809f8f | 8052 | val = Expression::make_string_info(arg, STRING_INFO_LENGTH, |
8053 | location); | |
e440a328 | 8054 | else if (arg_type->array_type() != NULL) |
0f914071 | 8055 | { |
8056 | if (this->seen_) | |
8057 | { | |
c484d925 | 8058 | go_assert(saw_errors()); |
ea664253 | 8059 | return context->backend()->error_expression(); |
0f914071 | 8060 | } |
8061 | this->seen_ = true; | |
2c809f8f | 8062 | val = arg_type->array_type()->get_length(gogo, arg); |
0f914071 | 8063 | this->seen_ = false; |
8064 | } | |
e440a328 | 8065 | else if (arg_type->map_type() != NULL) |
2c809f8f | 8066 | val = Runtime::make_call(Runtime::MAP_LEN, location, 1, arg); |
e440a328 | 8067 | else if (arg_type->channel_type() != NULL) |
2c809f8f | 8068 | val = Runtime::make_call(Runtime::CHAN_LEN, location, 1, arg); |
e440a328 | 8069 | else |
c3e6f413 | 8070 | go_unreachable(); |
e440a328 | 8071 | } |
8072 | else | |
8073 | { | |
8074 | if (arg_type->array_type() != NULL) | |
0f914071 | 8075 | { |
8076 | if (this->seen_) | |
8077 | { | |
c484d925 | 8078 | go_assert(saw_errors()); |
ea664253 | 8079 | return context->backend()->error_expression(); |
0f914071 | 8080 | } |
8081 | this->seen_ = true; | |
2c809f8f | 8082 | val = arg_type->array_type()->get_capacity(gogo, arg); |
0f914071 | 8083 | this->seen_ = false; |
8084 | } | |
e440a328 | 8085 | else if (arg_type->channel_type() != NULL) |
2c809f8f | 8086 | val = Runtime::make_call(Runtime::CHAN_CAP, location, 1, arg); |
e440a328 | 8087 | else |
c3e6f413 | 8088 | go_unreachable(); |
e440a328 | 8089 | } |
8090 | ||
2c809f8f | 8091 | return Expression::make_cast(int_type, val, |
ea664253 | 8092 | location)->get_backend(context); |
e440a328 | 8093 | } |
8094 | ||
8095 | case BUILTIN_PRINT: | |
8096 | case BUILTIN_PRINTLN: | |
8097 | { | |
8098 | const bool is_ln = this->code_ == BUILTIN_PRINTLN; | |
2c809f8f | 8099 | Expression* print_stmts = NULL; |
e440a328 | 8100 | |
8101 | const Expression_list* call_args = this->args(); | |
8102 | if (call_args != NULL) | |
8103 | { | |
8104 | for (Expression_list::const_iterator p = call_args->begin(); | |
8105 | p != call_args->end(); | |
8106 | ++p) | |
8107 | { | |
8108 | if (is_ln && p != call_args->begin()) | |
8109 | { | |
2c809f8f | 8110 | Expression* print_space = |
8111 | Runtime::make_call(Runtime::PRINT_SPACE, | |
8112 | this->location(), 0); | |
e440a328 | 8113 | |
2c809f8f | 8114 | print_stmts = |
8115 | Expression::make_compound(print_stmts, print_space, | |
8116 | location); | |
8117 | } | |
e440a328 | 8118 | |
2c809f8f | 8119 | Expression* arg = *p; |
8120 | Type* type = arg->type(); | |
8121 | Runtime::Function code; | |
e440a328 | 8122 | if (type->is_string_type()) |
2c809f8f | 8123 | code = Runtime::PRINT_STRING; |
e440a328 | 8124 | else if (type->integer_type() != NULL |
8125 | && type->integer_type()->is_unsigned()) | |
8126 | { | |
e440a328 | 8127 | Type* itype = Type::lookup_integer_type("uint64"); |
2c809f8f | 8128 | arg = Expression::make_cast(itype, arg, location); |
8129 | code = Runtime::PRINT_UINT64; | |
e440a328 | 8130 | } |
8131 | else if (type->integer_type() != NULL) | |
8132 | { | |
e440a328 | 8133 | Type* itype = Type::lookup_integer_type("int64"); |
2c809f8f | 8134 | arg = Expression::make_cast(itype, arg, location); |
8135 | code = Runtime::PRINT_INT64; | |
e440a328 | 8136 | } |
8137 | else if (type->float_type() != NULL) | |
8138 | { | |
2c809f8f | 8139 | Type* dtype = Type::lookup_float_type("float64"); |
8140 | arg = Expression::make_cast(dtype, arg, location); | |
8141 | code = Runtime::PRINT_DOUBLE; | |
e440a328 | 8142 | } |
8143 | else if (type->complex_type() != NULL) | |
8144 | { | |
2c809f8f | 8145 | Type* ctype = Type::lookup_complex_type("complex128"); |
8146 | arg = Expression::make_cast(ctype, arg, location); | |
8147 | code = Runtime::PRINT_COMPLEX; | |
e440a328 | 8148 | } |
8149 | else if (type->is_boolean_type()) | |
2c809f8f | 8150 | code = Runtime::PRINT_BOOL; |
e440a328 | 8151 | else if (type->points_to() != NULL |
8152 | || type->channel_type() != NULL | |
8153 | || type->map_type() != NULL | |
8154 | || type->function_type() != NULL) | |
8155 | { | |
2c809f8f | 8156 | arg = Expression::make_cast(type, arg, location); |
8157 | code = Runtime::PRINT_POINTER; | |
e440a328 | 8158 | } |
8159 | else if (type->interface_type() != NULL) | |
8160 | { | |
8161 | if (type->interface_type()->is_empty()) | |
2c809f8f | 8162 | code = Runtime::PRINT_EMPTY_INTERFACE; |
e440a328 | 8163 | else |
2c809f8f | 8164 | code = Runtime::PRINT_INTERFACE; |
e440a328 | 8165 | } |
411eb89e | 8166 | else if (type->is_slice_type()) |
2c809f8f | 8167 | code = Runtime::PRINT_SLICE; |
e440a328 | 8168 | else |
cd238b8d | 8169 | { |
8170 | go_assert(saw_errors()); | |
ea664253 | 8171 | return context->backend()->error_expression(); |
cd238b8d | 8172 | } |
e440a328 | 8173 | |
2c809f8f | 8174 | Expression* call = Runtime::make_call(code, location, 1, arg); |
8175 | if (print_stmts == NULL) | |
8176 | print_stmts = call; | |
8177 | else | |
8178 | print_stmts = Expression::make_compound(print_stmts, call, | |
8179 | location); | |
e440a328 | 8180 | } |
8181 | } | |
8182 | ||
8183 | if (is_ln) | |
8184 | { | |
2c809f8f | 8185 | Expression* print_nl = |
8186 | Runtime::make_call(Runtime::PRINT_NL, location, 0); | |
8187 | if (print_stmts == NULL) | |
8188 | print_stmts = print_nl; | |
8189 | else | |
8190 | print_stmts = Expression::make_compound(print_stmts, print_nl, | |
8191 | location); | |
e440a328 | 8192 | } |
8193 | ||
ea664253 | 8194 | return print_stmts->get_backend(context); |
e440a328 | 8195 | } |
8196 | ||
8197 | case BUILTIN_PANIC: | |
8198 | { | |
8199 | const Expression_list* args = this->args(); | |
c484d925 | 8200 | go_assert(args != NULL && args->size() == 1); |
e440a328 | 8201 | Expression* arg = args->front(); |
b13c66cd | 8202 | Type *empty = |
823c7e3d | 8203 | Type::make_empty_interface_type(Linemap::predeclared_location()); |
2c809f8f | 8204 | arg = Expression::convert_for_assignment(gogo, empty, arg, location); |
8205 | ||
8206 | Expression* panic = | |
8207 | Runtime::make_call(Runtime::PANIC, location, 1, arg); | |
ea664253 | 8208 | return panic->get_backend(context); |
e440a328 | 8209 | } |
8210 | ||
8211 | case BUILTIN_RECOVER: | |
8212 | { | |
8213 | // The argument is set when building recover thunks. It's a | |
8214 | // boolean value which is true if we can recover a value now. | |
8215 | const Expression_list* args = this->args(); | |
c484d925 | 8216 | go_assert(args != NULL && args->size() == 1); |
e440a328 | 8217 | Expression* arg = args->front(); |
b13c66cd | 8218 | Type *empty = |
823c7e3d | 8219 | Type::make_empty_interface_type(Linemap::predeclared_location()); |
e440a328 | 8220 | |
e440a328 | 8221 | Expression* nil = Expression::make_nil(location); |
2c809f8f | 8222 | nil = Expression::convert_for_assignment(gogo, empty, nil, location); |
e440a328 | 8223 | |
8224 | // We need to handle a deferred call to recover specially, | |
8225 | // because it changes whether it can recover a panic or not. | |
8226 | // See test7 in test/recover1.go. | |
2c809f8f | 8227 | Expression* recover = Runtime::make_call((this->is_deferred() |
8228 | ? Runtime::DEFERRED_RECOVER | |
8229 | : Runtime::RECOVER), | |
8230 | location, 0); | |
8231 | Expression* cond = | |
8232 | Expression::make_conditional(arg, recover, nil, location); | |
ea664253 | 8233 | return cond->get_backend(context); |
e440a328 | 8234 | } |
8235 | ||
8236 | case BUILTIN_CLOSE: | |
e440a328 | 8237 | { |
8238 | const Expression_list* args = this->args(); | |
c484d925 | 8239 | go_assert(args != NULL && args->size() == 1); |
e440a328 | 8240 | Expression* arg = args->front(); |
2c809f8f | 8241 | Expression* close = Runtime::make_call(Runtime::CLOSE, location, |
8242 | 1, arg); | |
ea664253 | 8243 | return close->get_backend(context); |
e440a328 | 8244 | } |
8245 | ||
8246 | case BUILTIN_SIZEOF: | |
8247 | case BUILTIN_OFFSETOF: | |
8248 | case BUILTIN_ALIGNOF: | |
8249 | { | |
0c77715b | 8250 | Numeric_constant nc; |
8251 | unsigned long val; | |
8252 | if (!this->numeric_constant_value(&nc) | |
8253 | || nc.to_unsigned_long(&val) != Numeric_constant::NC_UL_VALID) | |
7f1d9abd | 8254 | { |
c484d925 | 8255 | go_assert(saw_errors()); |
ea664253 | 8256 | return context->backend()->error_expression(); |
7f1d9abd | 8257 | } |
7ba86326 | 8258 | Type* uintptr_type = Type::lookup_integer_type("uintptr"); |
2c809f8f | 8259 | mpz_t ival; |
8260 | nc.get_int(&ival); | |
8261 | Expression* int_cst = | |
e67508fa | 8262 | Expression::make_integer_z(&ival, uintptr_type, location); |
2c809f8f | 8263 | mpz_clear(ival); |
ea664253 | 8264 | return int_cst->get_backend(context); |
e440a328 | 8265 | } |
8266 | ||
8267 | case BUILTIN_COPY: | |
8268 | { | |
8269 | const Expression_list* args = this->args(); | |
c484d925 | 8270 | go_assert(args != NULL && args->size() == 2); |
e440a328 | 8271 | Expression* arg1 = args->front(); |
8272 | Expression* arg2 = args->back(); | |
8273 | ||
e440a328 | 8274 | Type* arg1_type = arg1->type(); |
8275 | Array_type* at = arg1_type->array_type(); | |
35a54f17 | 8276 | go_assert(arg1->is_variable()); |
2c809f8f | 8277 | Expression* arg1_val = at->get_value_pointer(gogo, arg1); |
8278 | Expression* arg1_len = at->get_length(gogo, arg1); | |
e440a328 | 8279 | |
8280 | Type* arg2_type = arg2->type(); | |
2c809f8f | 8281 | go_assert(arg2->is_variable()); |
8282 | Expression* arg2_val; | |
8283 | Expression* arg2_len; | |
411eb89e | 8284 | if (arg2_type->is_slice_type()) |
e440a328 | 8285 | { |
8286 | at = arg2_type->array_type(); | |
2c809f8f | 8287 | arg2_val = at->get_value_pointer(gogo, arg2); |
8288 | arg2_len = at->get_length(gogo, arg2); | |
e440a328 | 8289 | } |
8290 | else | |
8291 | { | |
2c809f8f | 8292 | go_assert(arg2->is_variable()); |
8293 | arg2_val = Expression::make_string_info(arg2, STRING_INFO_DATA, | |
8294 | location); | |
8295 | arg2_len = Expression::make_string_info(arg2, STRING_INFO_LENGTH, | |
8296 | location); | |
e440a328 | 8297 | } |
2c809f8f | 8298 | Expression* cond = |
8299 | Expression::make_binary(OPERATOR_LT, arg1_len, arg2_len, location); | |
8300 | Expression* length = | |
8301 | Expression::make_conditional(cond, arg1_len, arg2_len, location); | |
e440a328 | 8302 | |
8303 | Type* element_type = at->element_type(); | |
9f0e0513 | 8304 | Btype* element_btype = element_type->get_backend(gogo); |
e67508fa | 8305 | size_t element_size = gogo->backend()->type_size(element_btype); |
8306 | Expression* size_expr = Expression::make_integer_ul(element_size, | |
8307 | length->type(), | |
8308 | location); | |
2c809f8f | 8309 | Expression* bytecount = |
8310 | Expression::make_binary(OPERATOR_MULT, size_expr, length, location); | |
8311 | Expression* copy = Runtime::make_call(Runtime::COPY, location, 3, | |
8312 | arg1_val, arg2_val, bytecount); | |
8313 | ||
8314 | Expression* compound = Expression::make_compound(copy, length, location); | |
ea664253 | 8315 | return compound->get_backend(context); |
e440a328 | 8316 | } |
8317 | ||
8318 | case BUILTIN_APPEND: | |
8319 | { | |
8320 | const Expression_list* args = this->args(); | |
c484d925 | 8321 | go_assert(args != NULL && args->size() == 2); |
e440a328 | 8322 | Expression* arg1 = args->front(); |
8323 | Expression* arg2 = args->back(); | |
8324 | ||
9d44fbe3 | 8325 | Array_type* at = arg1->type()->array_type(); |
4fd4fcf4 | 8326 | Type* element_type = at->element_type()->forwarded(); |
9d44fbe3 | 8327 | |
2c809f8f | 8328 | go_assert(arg2->is_variable()); |
8329 | Expression* arg2_val; | |
8330 | Expression* arg2_len; | |
e67508fa | 8331 | unsigned long size; |
4fd4fcf4 | 8332 | if (arg2->type()->is_string_type() |
60963afd | 8333 | && element_type->integer_type() != NULL |
8334 | && element_type->integer_type()->is_byte()) | |
4fd4fcf4 | 8335 | { |
2c809f8f | 8336 | arg2_val = Expression::make_string_info(arg2, STRING_INFO_DATA, |
8337 | location); | |
8338 | arg2_len = Expression::make_string_info(arg2, STRING_INFO_LENGTH, | |
8339 | location); | |
e67508fa | 8340 | size = 1; |
4fd4fcf4 | 8341 | } |
8342 | else | |
8343 | { | |
2c809f8f | 8344 | arg2_val = at->get_value_pointer(gogo, arg2); |
8345 | arg2_len = at->get_length(gogo, arg2); | |
35a54f17 | 8346 | Btype* element_btype = element_type->get_backend(gogo); |
e67508fa | 8347 | size = gogo->backend()->type_size(element_btype); |
4fd4fcf4 | 8348 | } |
2c809f8f | 8349 | Expression* element_size = |
e67508fa | 8350 | Expression::make_integer_ul(size, NULL, location); |
2c809f8f | 8351 | |
8352 | Expression* append = Runtime::make_call(Runtime::APPEND, location, 4, | |
8353 | arg1, arg2_val, arg2_len, | |
8354 | element_size); | |
8355 | append = Expression::make_unsafe_cast(arg1->type(), append, location); | |
ea664253 | 8356 | return append->get_backend(context); |
e440a328 | 8357 | } |
8358 | ||
8359 | case BUILTIN_REAL: | |
8360 | case BUILTIN_IMAG: | |
8361 | { | |
8362 | const Expression_list* args = this->args(); | |
c484d925 | 8363 | go_assert(args != NULL && args->size() == 1); |
2c809f8f | 8364 | |
8365 | Bexpression* ret; | |
ea664253 | 8366 | Bexpression* bcomplex = args->front()->get_backend(context); |
2c809f8f | 8367 | if (this->code_ == BUILTIN_REAL) |
8368 | ret = gogo->backend()->real_part_expression(bcomplex, location); | |
8369 | else | |
8370 | ret = gogo->backend()->imag_part_expression(bcomplex, location); | |
ea664253 | 8371 | return ret; |
e440a328 | 8372 | } |
8373 | ||
48080209 | 8374 | case BUILTIN_COMPLEX: |
e440a328 | 8375 | { |
8376 | const Expression_list* args = this->args(); | |
c484d925 | 8377 | go_assert(args != NULL && args->size() == 2); |
ea664253 | 8378 | Bexpression* breal = args->front()->get_backend(context); |
8379 | Bexpression* bimag = args->back()->get_backend(context); | |
8380 | return gogo->backend()->complex_expression(breal, bimag, location); | |
e440a328 | 8381 | } |
8382 | ||
8383 | default: | |
c3e6f413 | 8384 | go_unreachable(); |
e440a328 | 8385 | } |
8386 | } | |
8387 | ||
8388 | // We have to support exporting a builtin call expression, because | |
8389 | // code can set a constant to the result of a builtin expression. | |
8390 | ||
8391 | void | |
8392 | Builtin_call_expression::do_export(Export* exp) const | |
8393 | { | |
0c77715b | 8394 | Numeric_constant nc; |
8395 | if (!this->numeric_constant_value(&nc)) | |
8396 | { | |
8397 | error_at(this->location(), "value is not constant"); | |
8398 | return; | |
8399 | } | |
e440a328 | 8400 | |
0c77715b | 8401 | if (nc.is_int()) |
e440a328 | 8402 | { |
0c77715b | 8403 | mpz_t val; |
8404 | nc.get_int(&val); | |
e440a328 | 8405 | Integer_expression::export_integer(exp, val); |
0c77715b | 8406 | mpz_clear(val); |
e440a328 | 8407 | } |
0c77715b | 8408 | else if (nc.is_float()) |
e440a328 | 8409 | { |
8410 | mpfr_t fval; | |
0c77715b | 8411 | nc.get_float(&fval); |
8412 | Float_expression::export_float(exp, fval); | |
e440a328 | 8413 | mpfr_clear(fval); |
8414 | } | |
0c77715b | 8415 | else if (nc.is_complex()) |
e440a328 | 8416 | { |
fcbea5e4 | 8417 | mpc_t cval; |
8418 | nc.get_complex(&cval); | |
8419 | Complex_expression::export_complex(exp, cval); | |
8420 | mpc_clear(cval); | |
e440a328 | 8421 | } |
0c77715b | 8422 | else |
8423 | go_unreachable(); | |
e440a328 | 8424 | |
8425 | // A trailing space lets us reliably identify the end of the number. | |
8426 | exp->write_c_string(" "); | |
8427 | } | |
8428 | ||
8429 | // Class Call_expression. | |
8430 | ||
8381eda7 | 8431 | // A Go function can be viewed in a couple of different ways. The |
8432 | // code of a Go function becomes a backend function with parameters | |
8433 | // whose types are simply the backend representation of the Go types. | |
8434 | // If there are multiple results, they are returned as a backend | |
8435 | // struct. | |
8436 | ||
8437 | // However, when Go code refers to a function other than simply | |
8438 | // calling it, the backend type of that function is actually a struct. | |
8439 | // The first field of the struct points to the Go function code | |
8440 | // (sometimes a wrapper as described below). The remaining fields | |
8441 | // hold addresses of closed-over variables. This struct is called a | |
8442 | // closure. | |
8443 | ||
8444 | // There are a few cases to consider. | |
8445 | ||
8446 | // A direct function call of a known function in package scope. In | |
8447 | // this case there are no closed-over variables, and we know the name | |
8448 | // of the function code. We can simply produce a backend call to the | |
8449 | // function directly, and not worry about the closure. | |
8450 | ||
8451 | // A direct function call of a known function literal. In this case | |
8452 | // we know the function code and we know the closure. We generate the | |
8453 | // function code such that it expects an additional final argument of | |
8454 | // the closure type. We pass the closure as the last argument, after | |
8455 | // the other arguments. | |
8456 | ||
8457 | // An indirect function call. In this case we have a closure. We | |
8458 | // load the pointer to the function code from the first field of the | |
8459 | // closure. We pass the address of the closure as the last argument. | |
8460 | ||
8461 | // A call to a method of an interface. Type methods are always at | |
8462 | // package scope, so we call the function directly, and don't worry | |
8463 | // about the closure. | |
8464 | ||
8465 | // This means that for a function at package scope we have two cases. | |
8466 | // One is the direct call, which has no closure. The other is the | |
8467 | // indirect call, which does have a closure. We can't simply ignore | |
8468 | // the closure, even though it is the last argument, because that will | |
8469 | // fail on targets where the function pops its arguments. So when | |
8470 | // generating a closure for a package-scope function we set the | |
8471 | // function code pointer in the closure to point to a wrapper | |
8472 | // function. This wrapper function accepts a final argument that | |
8473 | // points to the closure, ignores it, and calls the real function as a | |
8474 | // direct function call. This wrapper will normally be efficient, and | |
8475 | // can often simply be a tail call to the real function. | |
8476 | ||
8477 | // We don't use GCC's static chain pointer because 1) we don't need | |
8478 | // it; 2) GCC only permits using a static chain to call a known | |
8479 | // function, so we can't use it for an indirect call anyhow. Since we | |
8480 | // can't use it for an indirect call, we may as well not worry about | |
8481 | // using it for a direct call either. | |
8482 | ||
8483 | // We pass the closure last rather than first because it means that | |
8484 | // the function wrapper we put into a closure for a package-scope | |
8485 | // function can normally just be a tail call to the real function. | |
8486 | ||
8487 | // For method expressions we generate a wrapper that loads the | |
8488 | // receiver from the closure and then calls the method. This | |
8489 | // unfortunately forces reshuffling the arguments, since there is a | |
8490 | // new first argument, but we can't avoid reshuffling either for | |
8491 | // method expressions or for indirect calls of package-scope | |
8492 | // functions, and since the latter are more common we reshuffle for | |
8493 | // method expressions. | |
8494 | ||
8495 | // Note that the Go code retains the Go types. The extra final | |
8496 | // argument only appears when we convert to the backend | |
8497 | // representation. | |
8498 | ||
e440a328 | 8499 | // Traversal. |
8500 | ||
8501 | int | |
8502 | Call_expression::do_traverse(Traverse* traverse) | |
8503 | { | |
8504 | if (Expression::traverse(&this->fn_, traverse) == TRAVERSE_EXIT) | |
8505 | return TRAVERSE_EXIT; | |
8506 | if (this->args_ != NULL) | |
8507 | { | |
8508 | if (this->args_->traverse(traverse) == TRAVERSE_EXIT) | |
8509 | return TRAVERSE_EXIT; | |
8510 | } | |
8511 | return TRAVERSE_CONTINUE; | |
8512 | } | |
8513 | ||
8514 | // Lower a call statement. | |
8515 | ||
8516 | Expression* | |
ceeb4318 | 8517 | Call_expression::do_lower(Gogo* gogo, Named_object* function, |
8518 | Statement_inserter* inserter, int) | |
e440a328 | 8519 | { |
b13c66cd | 8520 | Location loc = this->location(); |
09ea332d | 8521 | |
ceeb4318 | 8522 | // A type cast can look like a function call. |
e440a328 | 8523 | if (this->fn_->is_type_expression() |
8524 | && this->args_ != NULL | |
8525 | && this->args_->size() == 1) | |
8526 | return Expression::make_cast(this->fn_->type(), this->args_->front(), | |
09ea332d | 8527 | loc); |
e440a328 | 8528 | |
88f06749 | 8529 | // Because do_type will return an error type and thus prevent future |
8530 | // errors, check for that case now to ensure that the error gets | |
8531 | // reported. | |
37448b10 | 8532 | Function_type* fntype = this->get_function_type(); |
8533 | if (fntype == NULL) | |
88f06749 | 8534 | { |
8535 | if (!this->fn_->type()->is_error()) | |
8536 | this->report_error(_("expected function")); | |
8537 | return Expression::make_error(loc); | |
8538 | } | |
8539 | ||
e440a328 | 8540 | // Handle an argument which is a call to a function which returns |
8541 | // multiple results. | |
8542 | if (this->args_ != NULL | |
8543 | && this->args_->size() == 1 | |
37448b10 | 8544 | && this->args_->front()->call_expression() != NULL) |
e440a328 | 8545 | { |
e440a328 | 8546 | size_t rc = this->args_->front()->call_expression()->result_count(); |
8547 | if (rc > 1 | |
37448b10 | 8548 | && ((fntype->parameters() != NULL |
8549 | && (fntype->parameters()->size() == rc | |
8550 | || (fntype->is_varargs() | |
8551 | && fntype->parameters()->size() - 1 <= rc))) | |
8552 | || fntype->is_builtin())) | |
e440a328 | 8553 | { |
8554 | Call_expression* call = this->args_->front()->call_expression(); | |
e90ecd2d | 8555 | call->set_is_multi_value_arg(); |
e440a328 | 8556 | Expression_list* args = new Expression_list; |
8557 | for (size_t i = 0; i < rc; ++i) | |
8558 | args->push_back(Expression::make_call_result(call, i)); | |
8559 | // We can't return a new call expression here, because this | |
42535814 | 8560 | // one may be referenced by Call_result expressions. We |
8561 | // also can't delete the old arguments, because we may still | |
8562 | // traverse them somewhere up the call stack. FIXME. | |
e440a328 | 8563 | this->args_ = args; |
8564 | } | |
8565 | } | |
8566 | ||
37448b10 | 8567 | // Recognize a call to a builtin function. |
8568 | if (fntype->is_builtin()) | |
8569 | return new Builtin_call_expression(gogo, this->fn_, this->args_, | |
8570 | this->is_varargs_, loc); | |
8571 | ||
ceeb4318 | 8572 | // If this call returns multiple results, create a temporary |
8573 | // variable for each result. | |
8574 | size_t rc = this->result_count(); | |
8575 | if (rc > 1 && this->results_ == NULL) | |
8576 | { | |
8577 | std::vector<Temporary_statement*>* temps = | |
8578 | new std::vector<Temporary_statement*>; | |
8579 | temps->reserve(rc); | |
37448b10 | 8580 | const Typed_identifier_list* results = fntype->results(); |
ceeb4318 | 8581 | for (Typed_identifier_list::const_iterator p = results->begin(); |
8582 | p != results->end(); | |
8583 | ++p) | |
8584 | { | |
8585 | Temporary_statement* temp = Statement::make_temporary(p->type(), | |
09ea332d | 8586 | NULL, loc); |
ceeb4318 | 8587 | inserter->insert(temp); |
8588 | temps->push_back(temp); | |
8589 | } | |
8590 | this->results_ = temps; | |
8591 | } | |
8592 | ||
e440a328 | 8593 | // Handle a call to a varargs function by packaging up the extra |
8594 | // parameters. | |
37448b10 | 8595 | if (fntype->is_varargs()) |
e440a328 | 8596 | { |
e440a328 | 8597 | const Typed_identifier_list* parameters = fntype->parameters(); |
c484d925 | 8598 | go_assert(parameters != NULL && !parameters->empty()); |
e440a328 | 8599 | Type* varargs_type = parameters->back().type(); |
09ea332d | 8600 | this->lower_varargs(gogo, function, inserter, varargs_type, |
8601 | parameters->size()); | |
8602 | } | |
8603 | ||
8604 | // If this is call to a method, call the method directly passing the | |
8605 | // object as the first parameter. | |
8606 | Bound_method_expression* bme = this->fn_->bound_method_expression(); | |
8607 | if (bme != NULL) | |
8608 | { | |
0afbb937 | 8609 | Named_object* methodfn = bme->function(); |
09ea332d | 8610 | Expression* first_arg = bme->first_argument(); |
8611 | ||
8612 | // We always pass a pointer when calling a method. | |
8613 | if (first_arg->type()->points_to() == NULL | |
8614 | && !first_arg->type()->is_error()) | |
8615 | { | |
8616 | first_arg = Expression::make_unary(OPERATOR_AND, first_arg, loc); | |
8617 | // We may need to create a temporary variable so that we can | |
8618 | // take the address. We can't do that here because it will | |
8619 | // mess up the order of evaluation. | |
8620 | Unary_expression* ue = static_cast<Unary_expression*>(first_arg); | |
8621 | ue->set_create_temp(); | |
8622 | } | |
8623 | ||
8624 | // If we are calling a method which was inherited from an | |
8625 | // embedded struct, and the method did not get a stub, then the | |
8626 | // first type may be wrong. | |
8627 | Type* fatype = bme->first_argument_type(); | |
8628 | if (fatype != NULL) | |
8629 | { | |
8630 | if (fatype->points_to() == NULL) | |
8631 | fatype = Type::make_pointer_type(fatype); | |
8632 | first_arg = Expression::make_unsafe_cast(fatype, first_arg, loc); | |
8633 | } | |
8634 | ||
8635 | Expression_list* new_args = new Expression_list(); | |
8636 | new_args->push_back(first_arg); | |
8637 | if (this->args_ != NULL) | |
8638 | { | |
8639 | for (Expression_list::const_iterator p = this->args_->begin(); | |
8640 | p != this->args_->end(); | |
8641 | ++p) | |
8642 | new_args->push_back(*p); | |
8643 | } | |
8644 | ||
8645 | // We have to change in place because this structure may be | |
8646 | // referenced by Call_result_expressions. We can't delete the | |
8647 | // old arguments, because we may be traversing them up in some | |
8648 | // caller. FIXME. | |
8649 | this->args_ = new_args; | |
0afbb937 | 8650 | this->fn_ = Expression::make_func_reference(methodfn, NULL, |
09ea332d | 8651 | bme->location()); |
e440a328 | 8652 | } |
8653 | ||
8654 | return this; | |
8655 | } | |
8656 | ||
8657 | // Lower a call to a varargs function. FUNCTION is the function in | |
8658 | // which the call occurs--it's not the function we are calling. | |
8659 | // VARARGS_TYPE is the type of the varargs parameter, a slice type. | |
8660 | // PARAM_COUNT is the number of parameters of the function we are | |
8661 | // calling; the last of these parameters will be the varargs | |
8662 | // parameter. | |
8663 | ||
09ea332d | 8664 | void |
e440a328 | 8665 | Call_expression::lower_varargs(Gogo* gogo, Named_object* function, |
ceeb4318 | 8666 | Statement_inserter* inserter, |
e440a328 | 8667 | Type* varargs_type, size_t param_count) |
8668 | { | |
8669 | if (this->varargs_are_lowered_) | |
09ea332d | 8670 | return; |
e440a328 | 8671 | |
b13c66cd | 8672 | Location loc = this->location(); |
e440a328 | 8673 | |
c484d925 | 8674 | go_assert(param_count > 0); |
411eb89e | 8675 | go_assert(varargs_type->is_slice_type()); |
e440a328 | 8676 | |
8677 | size_t arg_count = this->args_ == NULL ? 0 : this->args_->size(); | |
8678 | if (arg_count < param_count - 1) | |
8679 | { | |
8680 | // Not enough arguments; will be caught in check_types. | |
09ea332d | 8681 | return; |
e440a328 | 8682 | } |
8683 | ||
8684 | Expression_list* old_args = this->args_; | |
8685 | Expression_list* new_args = new Expression_list(); | |
8686 | bool push_empty_arg = false; | |
8687 | if (old_args == NULL || old_args->empty()) | |
8688 | { | |
c484d925 | 8689 | go_assert(param_count == 1); |
e440a328 | 8690 | push_empty_arg = true; |
8691 | } | |
8692 | else | |
8693 | { | |
8694 | Expression_list::const_iterator pa; | |
8695 | int i = 1; | |
8696 | for (pa = old_args->begin(); pa != old_args->end(); ++pa, ++i) | |
8697 | { | |
8698 | if (static_cast<size_t>(i) == param_count) | |
8699 | break; | |
8700 | new_args->push_back(*pa); | |
8701 | } | |
8702 | ||
8703 | // We have reached the varargs parameter. | |
8704 | ||
8705 | bool issued_error = false; | |
8706 | if (pa == old_args->end()) | |
8707 | push_empty_arg = true; | |
8708 | else if (pa + 1 == old_args->end() && this->is_varargs_) | |
8709 | new_args->push_back(*pa); | |
8710 | else if (this->is_varargs_) | |
8711 | { | |
a6645f74 | 8712 | if ((*pa)->type()->is_slice_type()) |
8713 | this->report_error(_("too many arguments")); | |
8714 | else | |
8715 | { | |
8716 | error_at(this->location(), | |
8717 | _("invalid use of %<...%> with non-slice")); | |
8718 | this->set_is_error(); | |
8719 | } | |
09ea332d | 8720 | return; |
e440a328 | 8721 | } |
e440a328 | 8722 | else |
8723 | { | |
8724 | Type* element_type = varargs_type->array_type()->element_type(); | |
8725 | Expression_list* vals = new Expression_list; | |
8726 | for (; pa != old_args->end(); ++pa, ++i) | |
8727 | { | |
8728 | // Check types here so that we get a better message. | |
8729 | Type* patype = (*pa)->type(); | |
b13c66cd | 8730 | Location paloc = (*pa)->location(); |
e440a328 | 8731 | if (!this->check_argument_type(i, element_type, patype, |
8732 | paloc, issued_error)) | |
8733 | continue; | |
8734 | vals->push_back(*pa); | |
8735 | } | |
8736 | Expression* val = | |
8737 | Expression::make_slice_composite_literal(varargs_type, vals, loc); | |
09ea332d | 8738 | gogo->lower_expression(function, inserter, &val); |
e440a328 | 8739 | new_args->push_back(val); |
8740 | } | |
8741 | } | |
8742 | ||
8743 | if (push_empty_arg) | |
8744 | new_args->push_back(Expression::make_nil(loc)); | |
8745 | ||
8746 | // We can't return a new call expression here, because this one may | |
6d4c2432 | 8747 | // be referenced by Call_result expressions. FIXME. We can't |
8748 | // delete OLD_ARGS because we may have both a Call_expression and a | |
8749 | // Builtin_call_expression which refer to them. FIXME. | |
e440a328 | 8750 | this->args_ = new_args; |
8751 | this->varargs_are_lowered_ = true; | |
e440a328 | 8752 | } |
8753 | ||
2c809f8f | 8754 | // Flatten a call with multiple results into a temporary. |
8755 | ||
8756 | Expression* | |
b8e86a51 | 8757 | Call_expression::do_flatten(Gogo* gogo, Named_object*, |
8758 | Statement_inserter* inserter) | |
2c809f8f | 8759 | { |
b8e86a51 | 8760 | if (this->classification() == EXPRESSION_ERROR) |
8761 | return this; | |
8762 | ||
8763 | // Add temporary variables for all arguments that require type | |
8764 | // conversion. | |
8765 | Function_type* fntype = this->get_function_type(); | |
9782d556 | 8766 | if (fntype == NULL) |
8767 | { | |
8768 | go_assert(saw_errors()); | |
8769 | return this; | |
8770 | } | |
b8e86a51 | 8771 | if (this->args_ != NULL && !this->args_->empty() |
8772 | && fntype->parameters() != NULL && !fntype->parameters()->empty()) | |
8773 | { | |
8774 | bool is_interface_method = | |
8775 | this->fn_->interface_field_reference_expression() != NULL; | |
8776 | ||
8777 | Expression_list *args = new Expression_list(); | |
8778 | Typed_identifier_list::const_iterator pp = fntype->parameters()->begin(); | |
8779 | Expression_list::const_iterator pa = this->args_->begin(); | |
8780 | if (!is_interface_method && fntype->is_method()) | |
8781 | { | |
8782 | // The receiver argument. | |
8783 | args->push_back(*pa); | |
8784 | ++pa; | |
8785 | } | |
8786 | for (; pa != this->args_->end(); ++pa, ++pp) | |
8787 | { | |
8788 | go_assert(pp != fntype->parameters()->end()); | |
8789 | if (Type::are_identical(pp->type(), (*pa)->type(), true, NULL)) | |
8790 | args->push_back(*pa); | |
8791 | else | |
8792 | { | |
8793 | Location loc = (*pa)->location(); | |
8ba8cc87 | 8794 | Expression* arg = *pa; |
8795 | if (!arg->is_variable()) | |
8796 | { | |
8797 | Temporary_statement *temp = | |
8798 | Statement::make_temporary(NULL, arg, loc); | |
8799 | inserter->insert(temp); | |
8800 | arg = Expression::make_temporary_reference(temp, loc); | |
8801 | } | |
8802 | arg = Expression::convert_for_assignment(gogo, pp->type(), arg, | |
8803 | loc); | |
8804 | args->push_back(arg); | |
b8e86a51 | 8805 | } |
8806 | } | |
8807 | delete this->args_; | |
8808 | this->args_ = args; | |
8809 | } | |
8810 | ||
2c809f8f | 8811 | size_t rc = this->result_count(); |
8812 | if (rc > 1 && this->call_temp_ == NULL) | |
8813 | { | |
8814 | Struct_field_list* sfl = new Struct_field_list(); | |
8815 | Function_type* fntype = this->get_function_type(); | |
8816 | const Typed_identifier_list* results = fntype->results(); | |
8817 | Location loc = this->location(); | |
8818 | ||
8819 | int i = 0; | |
8820 | char buf[10]; | |
8821 | for (Typed_identifier_list::const_iterator p = results->begin(); | |
8822 | p != results->end(); | |
8823 | ++p, ++i) | |
8824 | { | |
8825 | snprintf(buf, sizeof buf, "res%d", i); | |
8826 | sfl->push_back(Struct_field(Typed_identifier(buf, p->type(), loc))); | |
8827 | } | |
8828 | ||
8829 | Struct_type* st = Type::make_struct_type(sfl, loc); | |
8830 | this->call_temp_ = Statement::make_temporary(st, NULL, loc); | |
8831 | inserter->insert(this->call_temp_); | |
8832 | } | |
8833 | ||
8834 | return this; | |
8835 | } | |
8836 | ||
ceeb4318 | 8837 | // Get the function type. This can return NULL in error cases. |
e440a328 | 8838 | |
8839 | Function_type* | |
8840 | Call_expression::get_function_type() const | |
8841 | { | |
8842 | return this->fn_->type()->function_type(); | |
8843 | } | |
8844 | ||
8845 | // Return the number of values which this call will return. | |
8846 | ||
8847 | size_t | |
8848 | Call_expression::result_count() const | |
8849 | { | |
8850 | const Function_type* fntype = this->get_function_type(); | |
8851 | if (fntype == NULL) | |
8852 | return 0; | |
8853 | if (fntype->results() == NULL) | |
8854 | return 0; | |
8855 | return fntype->results()->size(); | |
8856 | } | |
8857 | ||
ceeb4318 | 8858 | // Return the temporary which holds a result. |
8859 | ||
8860 | Temporary_statement* | |
8861 | Call_expression::result(size_t i) const | |
8862 | { | |
cd238b8d | 8863 | if (this->results_ == NULL || this->results_->size() <= i) |
8864 | { | |
8865 | go_assert(saw_errors()); | |
8866 | return NULL; | |
8867 | } | |
ceeb4318 | 8868 | return (*this->results_)[i]; |
8869 | } | |
8870 | ||
1373401e | 8871 | // Set the number of results expected from a call expression. |
8872 | ||
8873 | void | |
8874 | Call_expression::set_expected_result_count(size_t count) | |
8875 | { | |
8876 | go_assert(this->expected_result_count_ == 0); | |
8877 | this->expected_result_count_ = count; | |
8878 | } | |
8879 | ||
e440a328 | 8880 | // Return whether this is a call to the predeclared function recover. |
8881 | ||
8882 | bool | |
8883 | Call_expression::is_recover_call() const | |
8884 | { | |
8885 | return this->do_is_recover_call(); | |
8886 | } | |
8887 | ||
8888 | // Set the argument to the recover function. | |
8889 | ||
8890 | void | |
8891 | Call_expression::set_recover_arg(Expression* arg) | |
8892 | { | |
8893 | this->do_set_recover_arg(arg); | |
8894 | } | |
8895 | ||
8896 | // Virtual functions also implemented by Builtin_call_expression. | |
8897 | ||
8898 | bool | |
8899 | Call_expression::do_is_recover_call() const | |
8900 | { | |
8901 | return false; | |
8902 | } | |
8903 | ||
8904 | void | |
8905 | Call_expression::do_set_recover_arg(Expression*) | |
8906 | { | |
c3e6f413 | 8907 | go_unreachable(); |
e440a328 | 8908 | } |
8909 | ||
ceeb4318 | 8910 | // We have found an error with this call expression; return true if |
8911 | // we should report it. | |
8912 | ||
8913 | bool | |
8914 | Call_expression::issue_error() | |
8915 | { | |
8916 | if (this->issued_error_) | |
8917 | return false; | |
8918 | else | |
8919 | { | |
8920 | this->issued_error_ = true; | |
8921 | return true; | |
8922 | } | |
8923 | } | |
8924 | ||
e440a328 | 8925 | // Get the type. |
8926 | ||
8927 | Type* | |
8928 | Call_expression::do_type() | |
8929 | { | |
8930 | if (this->type_ != NULL) | |
8931 | return this->type_; | |
8932 | ||
8933 | Type* ret; | |
8934 | Function_type* fntype = this->get_function_type(); | |
8935 | if (fntype == NULL) | |
8936 | return Type::make_error_type(); | |
8937 | ||
8938 | const Typed_identifier_list* results = fntype->results(); | |
8939 | if (results == NULL) | |
8940 | ret = Type::make_void_type(); | |
8941 | else if (results->size() == 1) | |
8942 | ret = results->begin()->type(); | |
8943 | else | |
8944 | ret = Type::make_call_multiple_result_type(this); | |
8945 | ||
8946 | this->type_ = ret; | |
8947 | ||
8948 | return this->type_; | |
8949 | } | |
8950 | ||
8951 | // Determine types for a call expression. We can use the function | |
8952 | // parameter types to set the types of the arguments. | |
8953 | ||
8954 | void | |
8955 | Call_expression::do_determine_type(const Type_context*) | |
8956 | { | |
fb94b0ca | 8957 | if (!this->determining_types()) |
8958 | return; | |
8959 | ||
e440a328 | 8960 | this->fn_->determine_type_no_context(); |
8961 | Function_type* fntype = this->get_function_type(); | |
8962 | const Typed_identifier_list* parameters = NULL; | |
8963 | if (fntype != NULL) | |
8964 | parameters = fntype->parameters(); | |
8965 | if (this->args_ != NULL) | |
8966 | { | |
8967 | Typed_identifier_list::const_iterator pt; | |
8968 | if (parameters != NULL) | |
8969 | pt = parameters->begin(); | |
09ea332d | 8970 | bool first = true; |
e440a328 | 8971 | for (Expression_list::const_iterator pa = this->args_->begin(); |
8972 | pa != this->args_->end(); | |
8973 | ++pa) | |
8974 | { | |
09ea332d | 8975 | if (first) |
8976 | { | |
8977 | first = false; | |
8978 | // If this is a method, the first argument is the | |
8979 | // receiver. | |
8980 | if (fntype != NULL && fntype->is_method()) | |
8981 | { | |
8982 | Type* rtype = fntype->receiver()->type(); | |
8983 | // The receiver is always passed as a pointer. | |
8984 | if (rtype->points_to() == NULL) | |
8985 | rtype = Type::make_pointer_type(rtype); | |
8986 | Type_context subcontext(rtype, false); | |
8987 | (*pa)->determine_type(&subcontext); | |
8988 | continue; | |
8989 | } | |
8990 | } | |
8991 | ||
e440a328 | 8992 | if (parameters != NULL && pt != parameters->end()) |
8993 | { | |
8994 | Type_context subcontext(pt->type(), false); | |
8995 | (*pa)->determine_type(&subcontext); | |
8996 | ++pt; | |
8997 | } | |
8998 | else | |
8999 | (*pa)->determine_type_no_context(); | |
9000 | } | |
9001 | } | |
9002 | } | |
9003 | ||
fb94b0ca | 9004 | // Called when determining types for a Call_expression. Return true |
9005 | // if we should go ahead, false if they have already been determined. | |
9006 | ||
9007 | bool | |
9008 | Call_expression::determining_types() | |
9009 | { | |
9010 | if (this->types_are_determined_) | |
9011 | return false; | |
9012 | else | |
9013 | { | |
9014 | this->types_are_determined_ = true; | |
9015 | return true; | |
9016 | } | |
9017 | } | |
9018 | ||
e440a328 | 9019 | // Check types for parameter I. |
9020 | ||
9021 | bool | |
9022 | Call_expression::check_argument_type(int i, const Type* parameter_type, | |
9023 | const Type* argument_type, | |
b13c66cd | 9024 | Location argument_location, |
e440a328 | 9025 | bool issued_error) |
9026 | { | |
9027 | std::string reason; | |
1eae365b | 9028 | if (!Type::are_assignable(parameter_type, argument_type, &reason)) |
e440a328 | 9029 | { |
9030 | if (!issued_error) | |
9031 | { | |
9032 | if (reason.empty()) | |
9033 | error_at(argument_location, "argument %d has incompatible type", i); | |
9034 | else | |
9035 | error_at(argument_location, | |
9036 | "argument %d has incompatible type (%s)", | |
9037 | i, reason.c_str()); | |
9038 | } | |
9039 | this->set_is_error(); | |
9040 | return false; | |
9041 | } | |
9042 | return true; | |
9043 | } | |
9044 | ||
9045 | // Check types. | |
9046 | ||
9047 | void | |
9048 | Call_expression::do_check_types(Gogo*) | |
9049 | { | |
a6645f74 | 9050 | if (this->classification() == EXPRESSION_ERROR) |
9051 | return; | |
9052 | ||
e440a328 | 9053 | Function_type* fntype = this->get_function_type(); |
9054 | if (fntype == NULL) | |
9055 | { | |
5c13bd80 | 9056 | if (!this->fn_->type()->is_error()) |
e440a328 | 9057 | this->report_error(_("expected function")); |
9058 | return; | |
9059 | } | |
9060 | ||
1373401e | 9061 | if (this->expected_result_count_ != 0 |
9062 | && this->expected_result_count_ != this->result_count()) | |
9063 | { | |
9064 | if (this->issue_error()) | |
9065 | this->report_error(_("function result count mismatch")); | |
9066 | this->set_is_error(); | |
9067 | return; | |
9068 | } | |
9069 | ||
09ea332d | 9070 | bool is_method = fntype->is_method(); |
9071 | if (is_method) | |
e440a328 | 9072 | { |
09ea332d | 9073 | go_assert(this->args_ != NULL && !this->args_->empty()); |
9074 | Type* rtype = fntype->receiver()->type(); | |
9075 | Expression* first_arg = this->args_->front(); | |
1eae365b | 9076 | // We dereference the values since receivers are always passed |
9077 | // as pointers. | |
09ea332d | 9078 | std::string reason; |
1eae365b | 9079 | if (!Type::are_assignable(rtype->deref(), first_arg->type()->deref(), |
9080 | &reason)) | |
e440a328 | 9081 | { |
09ea332d | 9082 | if (reason.empty()) |
9083 | this->report_error(_("incompatible type for receiver")); | |
9084 | else | |
e440a328 | 9085 | { |
09ea332d | 9086 | error_at(this->location(), |
9087 | "incompatible type for receiver (%s)", | |
9088 | reason.c_str()); | |
9089 | this->set_is_error(); | |
e440a328 | 9090 | } |
9091 | } | |
9092 | } | |
9093 | ||
9094 | // Note that varargs was handled by the lower_varargs() method, so | |
a6645f74 | 9095 | // we don't have to worry about it here unless something is wrong. |
9096 | if (this->is_varargs_ && !this->varargs_are_lowered_) | |
9097 | { | |
9098 | if (!fntype->is_varargs()) | |
9099 | { | |
9100 | error_at(this->location(), | |
9101 | _("invalid use of %<...%> calling non-variadic function")); | |
9102 | this->set_is_error(); | |
9103 | return; | |
9104 | } | |
9105 | } | |
e440a328 | 9106 | |
9107 | const Typed_identifier_list* parameters = fntype->parameters(); | |
9108 | if (this->args_ == NULL) | |
9109 | { | |
9110 | if (parameters != NULL && !parameters->empty()) | |
9111 | this->report_error(_("not enough arguments")); | |
9112 | } | |
9113 | else if (parameters == NULL) | |
09ea332d | 9114 | { |
9115 | if (!is_method || this->args_->size() > 1) | |
9116 | this->report_error(_("too many arguments")); | |
9117 | } | |
1373401e | 9118 | else if (this->args_->size() == 1 |
9119 | && this->args_->front()->call_expression() != NULL | |
9120 | && this->args_->front()->call_expression()->result_count() > 1) | |
9121 | { | |
9122 | // This is F(G()) when G returns more than one result. If the | |
9123 | // results can be matched to parameters, it would have been | |
9124 | // lowered in do_lower. If we get here we know there is a | |
9125 | // mismatch. | |
9126 | if (this->args_->front()->call_expression()->result_count() | |
9127 | < parameters->size()) | |
9128 | this->report_error(_("not enough arguments")); | |
9129 | else | |
9130 | this->report_error(_("too many arguments")); | |
9131 | } | |
e440a328 | 9132 | else |
9133 | { | |
9134 | int i = 0; | |
09ea332d | 9135 | Expression_list::const_iterator pa = this->args_->begin(); |
9136 | if (is_method) | |
9137 | ++pa; | |
9138 | for (Typed_identifier_list::const_iterator pt = parameters->begin(); | |
9139 | pt != parameters->end(); | |
9140 | ++pt, ++pa, ++i) | |
e440a328 | 9141 | { |
09ea332d | 9142 | if (pa == this->args_->end()) |
e440a328 | 9143 | { |
09ea332d | 9144 | this->report_error(_("not enough arguments")); |
e440a328 | 9145 | return; |
9146 | } | |
9147 | this->check_argument_type(i + 1, pt->type(), (*pa)->type(), | |
9148 | (*pa)->location(), false); | |
9149 | } | |
09ea332d | 9150 | if (pa != this->args_->end()) |
9151 | this->report_error(_("too many arguments")); | |
e440a328 | 9152 | } |
9153 | } | |
9154 | ||
72666aed | 9155 | Expression* |
9156 | Call_expression::do_copy() | |
9157 | { | |
9158 | Call_expression* call = | |
9159 | Expression::make_call(this->fn_->copy(), | |
9160 | (this->args_ == NULL | |
9161 | ? NULL | |
9162 | : this->args_->copy()), | |
9163 | this->is_varargs_, this->location()); | |
9164 | ||
9165 | if (this->varargs_are_lowered_) | |
9166 | call->set_varargs_are_lowered(); | |
9167 | return call; | |
9168 | } | |
9169 | ||
e440a328 | 9170 | // Return whether we have to use a temporary variable to ensure that |
9171 | // we evaluate this call expression in order. If the call returns no | |
ceeb4318 | 9172 | // results then it will inevitably be executed last. |
e440a328 | 9173 | |
9174 | bool | |
9175 | Call_expression::do_must_eval_in_order() const | |
9176 | { | |
ceeb4318 | 9177 | return this->result_count() > 0; |
e440a328 | 9178 | } |
9179 | ||
e440a328 | 9180 | // Get the function and the first argument to use when calling an |
9181 | // interface method. | |
9182 | ||
2387f644 | 9183 | Expression* |
e440a328 | 9184 | Call_expression::interface_method_function( |
e440a328 | 9185 | Interface_field_reference_expression* interface_method, |
2387f644 | 9186 | Expression** first_arg_ptr) |
e440a328 | 9187 | { |
2387f644 | 9188 | *first_arg_ptr = interface_method->get_underlying_object(); |
9189 | return interface_method->get_function(); | |
e440a328 | 9190 | } |
9191 | ||
9192 | // Build the call expression. | |
9193 | ||
ea664253 | 9194 | Bexpression* |
9195 | Call_expression::do_get_backend(Translate_context* context) | |
e440a328 | 9196 | { |
2c809f8f | 9197 | if (this->call_ != NULL) |
ea664253 | 9198 | return this->call_; |
e440a328 | 9199 | |
9200 | Function_type* fntype = this->get_function_type(); | |
9201 | if (fntype == NULL) | |
ea664253 | 9202 | return context->backend()->error_expression(); |
e440a328 | 9203 | |
9204 | if (this->fn_->is_error_expression()) | |
ea664253 | 9205 | return context->backend()->error_expression(); |
e440a328 | 9206 | |
9207 | Gogo* gogo = context->gogo(); | |
b13c66cd | 9208 | Location location = this->location(); |
e440a328 | 9209 | |
9210 | Func_expression* func = this->fn_->func_expression(); | |
e440a328 | 9211 | Interface_field_reference_expression* interface_method = |
9212 | this->fn_->interface_field_reference_expression(); | |
9213 | const bool has_closure = func != NULL && func->closure() != NULL; | |
09ea332d | 9214 | const bool is_interface_method = interface_method != NULL; |
e440a328 | 9215 | |
f8bdf81a | 9216 | bool has_closure_arg; |
8381eda7 | 9217 | if (has_closure) |
f8bdf81a | 9218 | has_closure_arg = true; |
8381eda7 | 9219 | else if (func != NULL) |
f8bdf81a | 9220 | has_closure_arg = false; |
8381eda7 | 9221 | else if (is_interface_method) |
f8bdf81a | 9222 | has_closure_arg = false; |
8381eda7 | 9223 | else |
f8bdf81a | 9224 | has_closure_arg = true; |
8381eda7 | 9225 | |
e440a328 | 9226 | int nargs; |
2c809f8f | 9227 | std::vector<Bexpression*> fn_args; |
e440a328 | 9228 | if (this->args_ == NULL || this->args_->empty()) |
9229 | { | |
f8bdf81a | 9230 | nargs = is_interface_method ? 1 : 0; |
2c809f8f | 9231 | if (nargs > 0) |
9232 | fn_args.resize(1); | |
e440a328 | 9233 | } |
09ea332d | 9234 | else if (fntype->parameters() == NULL || fntype->parameters()->empty()) |
9235 | { | |
9236 | // Passing a receiver parameter. | |
9237 | go_assert(!is_interface_method | |
9238 | && fntype->is_method() | |
9239 | && this->args_->size() == 1); | |
f8bdf81a | 9240 | nargs = 1; |
2c809f8f | 9241 | fn_args.resize(1); |
ea664253 | 9242 | fn_args[0] = this->args_->front()->get_backend(context); |
09ea332d | 9243 | } |
e440a328 | 9244 | else |
9245 | { | |
9246 | const Typed_identifier_list* params = fntype->parameters(); | |
e440a328 | 9247 | |
9248 | nargs = this->args_->size(); | |
09ea332d | 9249 | int i = is_interface_method ? 1 : 0; |
e440a328 | 9250 | nargs += i; |
2c809f8f | 9251 | fn_args.resize(nargs); |
e440a328 | 9252 | |
9253 | Typed_identifier_list::const_iterator pp = params->begin(); | |
09ea332d | 9254 | Expression_list::const_iterator pe = this->args_->begin(); |
9255 | if (!is_interface_method && fntype->is_method()) | |
9256 | { | |
ea664253 | 9257 | fn_args[i] = (*pe)->get_backend(context); |
09ea332d | 9258 | ++pe; |
9259 | ++i; | |
9260 | } | |
9261 | for (; pe != this->args_->end(); ++pe, ++pp, ++i) | |
e440a328 | 9262 | { |
c484d925 | 9263 | go_assert(pp != params->end()); |
2c809f8f | 9264 | Expression* arg = |
9265 | Expression::convert_for_assignment(gogo, pp->type(), *pe, | |
9266 | location); | |
ea664253 | 9267 | fn_args[i] = arg->get_backend(context); |
e440a328 | 9268 | } |
c484d925 | 9269 | go_assert(pp == params->end()); |
f8bdf81a | 9270 | go_assert(i == nargs); |
e440a328 | 9271 | } |
9272 | ||
2c809f8f | 9273 | Expression* fn; |
9274 | Expression* closure = NULL; | |
8381eda7 | 9275 | if (func != NULL) |
9276 | { | |
9277 | Named_object* no = func->named_object(); | |
2c809f8f | 9278 | fn = Expression::make_func_code_reference(no, location); |
9279 | if (has_closure) | |
9280 | closure = func->closure(); | |
8381eda7 | 9281 | } |
09ea332d | 9282 | else if (!is_interface_method) |
8381eda7 | 9283 | { |
2c809f8f | 9284 | closure = this->fn_; |
9285 | ||
9286 | // The backend representation of this function type is a pointer | |
9287 | // to a struct whose first field is the actual function to call. | |
9288 | Type* pfntype = | |
9289 | Type::make_pointer_type( | |
9290 | Type::make_pointer_type(Type::make_void_type())); | |
9291 | fn = Expression::make_unsafe_cast(pfntype, this->fn_, location); | |
9292 | fn = Expression::make_unary(OPERATOR_MULT, fn, location); | |
9293 | } | |
e440a328 | 9294 | else |
cf609de4 | 9295 | { |
2387f644 | 9296 | Expression* first_arg; |
2c809f8f | 9297 | fn = this->interface_method_function(interface_method, &first_arg); |
ea664253 | 9298 | fn_args[0] = first_arg->get_backend(context); |
e440a328 | 9299 | } |
9300 | ||
f8bdf81a | 9301 | if (!has_closure_arg) |
2c809f8f | 9302 | go_assert(closure == NULL); |
f8bdf81a | 9303 | else |
9304 | { | |
9305 | // Pass the closure argument by calling the function function | |
9306 | // __go_set_closure. In the order_evaluations pass we have | |
9307 | // ensured that if any parameters contain call expressions, they | |
9308 | // will have been moved out to temporary variables. | |
2c809f8f | 9309 | go_assert(closure != NULL); |
9310 | Expression* set_closure = | |
9311 | Runtime::make_call(Runtime::SET_CLOSURE, location, 1, closure); | |
9312 | fn = Expression::make_compound(set_closure, fn, location); | |
f8bdf81a | 9313 | } |
9314 | ||
ea664253 | 9315 | Bexpression* bfn = fn->get_backend(context); |
80d1e1a8 | 9316 | |
9317 | // When not calling a named function directly, use a type conversion | |
9318 | // in case the type of the function is a recursive type which refers | |
9319 | // to itself. We don't do this for an interface method because 1) | |
9320 | // an interface method never refers to itself, so we always have a | |
9321 | // function type here; 2) we pass an extra first argument to an | |
9322 | // interface method, so fntype is not correct. | |
9323 | if (func == NULL && !is_interface_method) | |
9324 | { | |
9325 | Btype* bft = fntype->get_backend_fntype(gogo); | |
9326 | bfn = gogo->backend()->convert_expression(bft, bfn, location); | |
9327 | } | |
9328 | ||
2c809f8f | 9329 | Bexpression* call = gogo->backend()->call_expression(bfn, fn_args, location); |
e440a328 | 9330 | |
2c809f8f | 9331 | if (this->results_ != NULL) |
e440a328 | 9332 | { |
2c809f8f | 9333 | go_assert(this->call_temp_ != NULL); |
9334 | Expression* call_ref = | |
9335 | Expression::make_temporary_reference(this->call_temp_, location); | |
ea664253 | 9336 | Bexpression* bcall_ref = call_ref->get_backend(context); |
2c809f8f | 9337 | Bstatement* assn_stmt = |
9338 | gogo->backend()->assignment_statement(bcall_ref, call, location); | |
e440a328 | 9339 | |
2c809f8f | 9340 | this->call_ = this->set_results(context, bcall_ref); |
e440a328 | 9341 | |
2c809f8f | 9342 | Bexpression* set_and_call = |
9343 | gogo->backend()->compound_expression(assn_stmt, this->call_, | |
9344 | location); | |
ea664253 | 9345 | return set_and_call; |
2c809f8f | 9346 | } |
e440a328 | 9347 | |
2c809f8f | 9348 | this->call_ = call; |
ea664253 | 9349 | return this->call_; |
e440a328 | 9350 | } |
9351 | ||
ceeb4318 | 9352 | // Set the result variables if this call returns multiple results. |
9353 | ||
2c809f8f | 9354 | Bexpression* |
9355 | Call_expression::set_results(Translate_context* context, Bexpression* call) | |
ceeb4318 | 9356 | { |
2c809f8f | 9357 | Gogo* gogo = context->gogo(); |
ceeb4318 | 9358 | |
2c809f8f | 9359 | Bexpression* results = NULL; |
b13c66cd | 9360 | Location loc = this->location(); |
2c809f8f | 9361 | |
ceeb4318 | 9362 | size_t rc = this->result_count(); |
2c809f8f | 9363 | for (size_t i = 0; i < rc; ++i) |
ceeb4318 | 9364 | { |
ceeb4318 | 9365 | Temporary_statement* temp = this->result(i); |
cd238b8d | 9366 | if (temp == NULL) |
9367 | { | |
9368 | go_assert(saw_errors()); | |
2c809f8f | 9369 | return gogo->backend()->error_expression(); |
cd238b8d | 9370 | } |
ceeb4318 | 9371 | Temporary_reference_expression* ref = |
9372 | Expression::make_temporary_reference(temp, loc); | |
9373 | ref->set_is_lvalue(); | |
ceeb4318 | 9374 | |
ea664253 | 9375 | Bexpression* result_ref = ref->get_backend(context); |
2c809f8f | 9376 | Bexpression* call_result = |
9377 | gogo->backend()->struct_field_expression(call, i, loc); | |
9378 | Bstatement* assn_stmt = | |
9379 | gogo->backend()->assignment_statement(result_ref, call_result, loc); | |
ceeb4318 | 9380 | |
2c809f8f | 9381 | Bexpression* result = |
9382 | gogo->backend()->compound_expression(assn_stmt, call_result, loc); | |
ceeb4318 | 9383 | |
2c809f8f | 9384 | if (results == NULL) |
9385 | results = result; | |
9386 | else | |
9387 | { | |
9388 | Bstatement* expr_stmt = gogo->backend()->expression_statement(result); | |
9389 | results = | |
9390 | gogo->backend()->compound_expression(expr_stmt, results, loc); | |
9391 | } | |
9392 | } | |
9393 | return results; | |
ceeb4318 | 9394 | } |
9395 | ||
d751bb78 | 9396 | // Dump ast representation for a call expressin. |
9397 | ||
9398 | void | |
9399 | Call_expression::do_dump_expression(Ast_dump_context* ast_dump_context) const | |
9400 | { | |
9401 | this->fn_->dump_expression(ast_dump_context); | |
9402 | ast_dump_context->ostream() << "("; | |
9403 | if (args_ != NULL) | |
9404 | ast_dump_context->dump_expression_list(this->args_); | |
9405 | ||
9406 | ast_dump_context->ostream() << ") "; | |
9407 | } | |
9408 | ||
e440a328 | 9409 | // Make a call expression. |
9410 | ||
9411 | Call_expression* | |
9412 | Expression::make_call(Expression* fn, Expression_list* args, bool is_varargs, | |
b13c66cd | 9413 | Location location) |
e440a328 | 9414 | { |
9415 | return new Call_expression(fn, args, is_varargs, location); | |
9416 | } | |
9417 | ||
9418 | // A single result from a call which returns multiple results. | |
9419 | ||
9420 | class Call_result_expression : public Expression | |
9421 | { | |
9422 | public: | |
9423 | Call_result_expression(Call_expression* call, unsigned int index) | |
9424 | : Expression(EXPRESSION_CALL_RESULT, call->location()), | |
9425 | call_(call), index_(index) | |
9426 | { } | |
9427 | ||
9428 | protected: | |
9429 | int | |
9430 | do_traverse(Traverse*); | |
9431 | ||
9432 | Type* | |
9433 | do_type(); | |
9434 | ||
9435 | void | |
9436 | do_determine_type(const Type_context*); | |
9437 | ||
9438 | void | |
9439 | do_check_types(Gogo*); | |
9440 | ||
9441 | Expression* | |
9442 | do_copy() | |
9443 | { | |
9444 | return new Call_result_expression(this->call_->call_expression(), | |
9445 | this->index_); | |
9446 | } | |
9447 | ||
9448 | bool | |
9449 | do_must_eval_in_order() const | |
9450 | { return true; } | |
9451 | ||
ea664253 | 9452 | Bexpression* |
9453 | do_get_backend(Translate_context*); | |
e440a328 | 9454 | |
d751bb78 | 9455 | void |
9456 | do_dump_expression(Ast_dump_context*) const; | |
9457 | ||
e440a328 | 9458 | private: |
9459 | // The underlying call expression. | |
9460 | Expression* call_; | |
9461 | // Which result we want. | |
9462 | unsigned int index_; | |
9463 | }; | |
9464 | ||
9465 | // Traverse a call result. | |
9466 | ||
9467 | int | |
9468 | Call_result_expression::do_traverse(Traverse* traverse) | |
9469 | { | |
9470 | if (traverse->remember_expression(this->call_)) | |
9471 | { | |
9472 | // We have already traversed the call expression. | |
9473 | return TRAVERSE_CONTINUE; | |
9474 | } | |
9475 | return Expression::traverse(&this->call_, traverse); | |
9476 | } | |
9477 | ||
9478 | // Get the type. | |
9479 | ||
9480 | Type* | |
9481 | Call_result_expression::do_type() | |
9482 | { | |
425dd051 | 9483 | if (this->classification() == EXPRESSION_ERROR) |
9484 | return Type::make_error_type(); | |
9485 | ||
e440a328 | 9486 | // THIS->CALL_ can be replaced with a temporary reference due to |
9487 | // Call_expression::do_must_eval_in_order when there is an error. | |
9488 | Call_expression* ce = this->call_->call_expression(); | |
9489 | if (ce == NULL) | |
5e85f268 | 9490 | { |
9491 | this->set_is_error(); | |
9492 | return Type::make_error_type(); | |
9493 | } | |
e440a328 | 9494 | Function_type* fntype = ce->get_function_type(); |
9495 | if (fntype == NULL) | |
5e85f268 | 9496 | { |
e37658e2 | 9497 | if (ce->issue_error()) |
99b3f06f | 9498 | { |
9499 | if (!ce->fn()->type()->is_error()) | |
9500 | this->report_error(_("expected function")); | |
9501 | } | |
5e85f268 | 9502 | this->set_is_error(); |
9503 | return Type::make_error_type(); | |
9504 | } | |
e440a328 | 9505 | const Typed_identifier_list* results = fntype->results(); |
ceeb4318 | 9506 | if (results == NULL || results->size() < 2) |
7b8d861f | 9507 | { |
ceeb4318 | 9508 | if (ce->issue_error()) |
9509 | this->report_error(_("number of results does not match " | |
9510 | "number of values")); | |
7b8d861f | 9511 | return Type::make_error_type(); |
9512 | } | |
e440a328 | 9513 | Typed_identifier_list::const_iterator pr = results->begin(); |
9514 | for (unsigned int i = 0; i < this->index_; ++i) | |
9515 | { | |
9516 | if (pr == results->end()) | |
425dd051 | 9517 | break; |
e440a328 | 9518 | ++pr; |
9519 | } | |
9520 | if (pr == results->end()) | |
425dd051 | 9521 | { |
ceeb4318 | 9522 | if (ce->issue_error()) |
9523 | this->report_error(_("number of results does not match " | |
9524 | "number of values")); | |
425dd051 | 9525 | return Type::make_error_type(); |
9526 | } | |
e440a328 | 9527 | return pr->type(); |
9528 | } | |
9529 | ||
425dd051 | 9530 | // Check the type. Just make sure that we trigger the warning in |
9531 | // do_type. | |
e440a328 | 9532 | |
9533 | void | |
9534 | Call_result_expression::do_check_types(Gogo*) | |
9535 | { | |
425dd051 | 9536 | this->type(); |
e440a328 | 9537 | } |
9538 | ||
9539 | // Determine the type. We have nothing to do here, but the 0 result | |
9540 | // needs to pass down to the caller. | |
9541 | ||
9542 | void | |
9543 | Call_result_expression::do_determine_type(const Type_context*) | |
9544 | { | |
fb94b0ca | 9545 | this->call_->determine_type_no_context(); |
e440a328 | 9546 | } |
9547 | ||
ea664253 | 9548 | // Return the backend representation. We just refer to the temporary set by the |
9549 | // call expression. We don't do this at lowering time because it makes it | |
ceeb4318 | 9550 | // hard to evaluate the call at the right time. |
e440a328 | 9551 | |
ea664253 | 9552 | Bexpression* |
9553 | Call_result_expression::do_get_backend(Translate_context* context) | |
e440a328 | 9554 | { |
ceeb4318 | 9555 | Call_expression* ce = this->call_->call_expression(); |
cd238b8d | 9556 | if (ce == NULL) |
9557 | { | |
9558 | go_assert(this->call_->is_error_expression()); | |
ea664253 | 9559 | return context->backend()->error_expression(); |
cd238b8d | 9560 | } |
ceeb4318 | 9561 | Temporary_statement* ts = ce->result(this->index_); |
cd238b8d | 9562 | if (ts == NULL) |
9563 | { | |
9564 | go_assert(saw_errors()); | |
ea664253 | 9565 | return context->backend()->error_expression(); |
cd238b8d | 9566 | } |
ceeb4318 | 9567 | Expression* ref = Expression::make_temporary_reference(ts, this->location()); |
ea664253 | 9568 | return ref->get_backend(context); |
e440a328 | 9569 | } |
9570 | ||
d751bb78 | 9571 | // Dump ast representation for a call result expression. |
9572 | ||
9573 | void | |
9574 | Call_result_expression::do_dump_expression(Ast_dump_context* ast_dump_context) | |
9575 | const | |
9576 | { | |
9577 | // FIXME: Wouldn't it be better if the call is assigned to a temporary | |
9578 | // (struct) and the fields are referenced instead. | |
9579 | ast_dump_context->ostream() << this->index_ << "@("; | |
9580 | ast_dump_context->dump_expression(this->call_); | |
9581 | ast_dump_context->ostream() << ")"; | |
9582 | } | |
9583 | ||
e440a328 | 9584 | // Make a reference to a single result of a call which returns |
9585 | // multiple results. | |
9586 | ||
9587 | Expression* | |
9588 | Expression::make_call_result(Call_expression* call, unsigned int index) | |
9589 | { | |
9590 | return new Call_result_expression(call, index); | |
9591 | } | |
9592 | ||
9593 | // Class Index_expression. | |
9594 | ||
9595 | // Traversal. | |
9596 | ||
9597 | int | |
9598 | Index_expression::do_traverse(Traverse* traverse) | |
9599 | { | |
9600 | if (Expression::traverse(&this->left_, traverse) == TRAVERSE_EXIT | |
9601 | || Expression::traverse(&this->start_, traverse) == TRAVERSE_EXIT | |
9602 | || (this->end_ != NULL | |
acf2b673 | 9603 | && Expression::traverse(&this->end_, traverse) == TRAVERSE_EXIT) |
9604 | || (this->cap_ != NULL | |
9605 | && Expression::traverse(&this->cap_, traverse) == TRAVERSE_EXIT)) | |
e440a328 | 9606 | return TRAVERSE_EXIT; |
9607 | return TRAVERSE_CONTINUE; | |
9608 | } | |
9609 | ||
9610 | // Lower an index expression. This converts the generic index | |
9611 | // expression into an array index, a string index, or a map index. | |
9612 | ||
9613 | Expression* | |
ceeb4318 | 9614 | Index_expression::do_lower(Gogo*, Named_object*, Statement_inserter*, int) |
e440a328 | 9615 | { |
b13c66cd | 9616 | Location location = this->location(); |
e440a328 | 9617 | Expression* left = this->left_; |
9618 | Expression* start = this->start_; | |
9619 | Expression* end = this->end_; | |
acf2b673 | 9620 | Expression* cap = this->cap_; |
e440a328 | 9621 | |
9622 | Type* type = left->type(); | |
5c13bd80 | 9623 | if (type->is_error()) |
d9f3743a | 9624 | { |
9625 | go_assert(saw_errors()); | |
9626 | return Expression::make_error(location); | |
9627 | } | |
b0cf7ddd | 9628 | else if (left->is_type_expression()) |
9629 | { | |
9630 | error_at(location, "attempt to index type expression"); | |
9631 | return Expression::make_error(location); | |
9632 | } | |
e440a328 | 9633 | else if (type->array_type() != NULL) |
acf2b673 | 9634 | return Expression::make_array_index(left, start, end, cap, location); |
e440a328 | 9635 | else if (type->points_to() != NULL |
9636 | && type->points_to()->array_type() != NULL | |
411eb89e | 9637 | && !type->points_to()->is_slice_type()) |
e440a328 | 9638 | { |
9639 | Expression* deref = Expression::make_unary(OPERATOR_MULT, left, | |
9640 | location); | |
38092374 | 9641 | |
9642 | // For an ordinary index into the array, the pointer will be | |
9643 | // dereferenced. For a slice it will not--the resulting slice | |
9644 | // will simply reuse the pointer, which is incorrect if that | |
9645 | // pointer is nil. | |
9646 | if (end != NULL || cap != NULL) | |
9647 | deref->issue_nil_check(); | |
9648 | ||
acf2b673 | 9649 | return Expression::make_array_index(deref, start, end, cap, location); |
e440a328 | 9650 | } |
9651 | else if (type->is_string_type()) | |
acf2b673 | 9652 | { |
9653 | if (cap != NULL) | |
9654 | { | |
9655 | error_at(location, "invalid 3-index slice of string"); | |
9656 | return Expression::make_error(location); | |
9657 | } | |
9658 | return Expression::make_string_index(left, start, end, location); | |
9659 | } | |
e440a328 | 9660 | else if (type->map_type() != NULL) |
9661 | { | |
acf2b673 | 9662 | if (end != NULL || cap != NULL) |
e440a328 | 9663 | { |
9664 | error_at(location, "invalid slice of map"); | |
9665 | return Expression::make_error(location); | |
9666 | } | |
6d4c2432 | 9667 | Map_index_expression* ret = Expression::make_map_index(left, start, |
9668 | location); | |
e440a328 | 9669 | if (this->is_lvalue_) |
9670 | ret->set_is_lvalue(); | |
9671 | return ret; | |
9672 | } | |
9673 | else | |
9674 | { | |
9675 | error_at(location, | |
9676 | "attempt to index object which is not array, string, or map"); | |
9677 | return Expression::make_error(location); | |
9678 | } | |
9679 | } | |
9680 | ||
acf2b673 | 9681 | // Write an indexed expression |
9682 | // (expr[expr:expr:expr], expr[expr:expr] or expr[expr]) to a dump context. | |
d751bb78 | 9683 | |
9684 | void | |
9685 | Index_expression::dump_index_expression(Ast_dump_context* ast_dump_context, | |
9686 | const Expression* expr, | |
9687 | const Expression* start, | |
acf2b673 | 9688 | const Expression* end, |
9689 | const Expression* cap) | |
d751bb78 | 9690 | { |
9691 | expr->dump_expression(ast_dump_context); | |
9692 | ast_dump_context->ostream() << "["; | |
9693 | start->dump_expression(ast_dump_context); | |
9694 | if (end != NULL) | |
9695 | { | |
9696 | ast_dump_context->ostream() << ":"; | |
9697 | end->dump_expression(ast_dump_context); | |
9698 | } | |
acf2b673 | 9699 | if (cap != NULL) |
9700 | { | |
9701 | ast_dump_context->ostream() << ":"; | |
9702 | cap->dump_expression(ast_dump_context); | |
9703 | } | |
d751bb78 | 9704 | ast_dump_context->ostream() << "]"; |
9705 | } | |
9706 | ||
9707 | // Dump ast representation for an index expression. | |
9708 | ||
9709 | void | |
9710 | Index_expression::do_dump_expression(Ast_dump_context* ast_dump_context) | |
9711 | const | |
9712 | { | |
9713 | Index_expression::dump_index_expression(ast_dump_context, this->left_, | |
acf2b673 | 9714 | this->start_, this->end_, this->cap_); |
d751bb78 | 9715 | } |
9716 | ||
e440a328 | 9717 | // Make an index expression. |
9718 | ||
9719 | Expression* | |
9720 | Expression::make_index(Expression* left, Expression* start, Expression* end, | |
acf2b673 | 9721 | Expression* cap, Location location) |
e440a328 | 9722 | { |
acf2b673 | 9723 | return new Index_expression(left, start, end, cap, location); |
e440a328 | 9724 | } |
9725 | ||
9726 | // An array index. This is used for both indexing and slicing. | |
9727 | ||
9728 | class Array_index_expression : public Expression | |
9729 | { | |
9730 | public: | |
9731 | Array_index_expression(Expression* array, Expression* start, | |
acf2b673 | 9732 | Expression* end, Expression* cap, Location location) |
e440a328 | 9733 | : Expression(EXPRESSION_ARRAY_INDEX, location), |
acf2b673 | 9734 | array_(array), start_(start), end_(end), cap_(cap), type_(NULL) |
e440a328 | 9735 | { } |
9736 | ||
9737 | protected: | |
9738 | int | |
9739 | do_traverse(Traverse*); | |
9740 | ||
2c809f8f | 9741 | Expression* |
9742 | do_flatten(Gogo*, Named_object*, Statement_inserter*); | |
9743 | ||
e440a328 | 9744 | Type* |
9745 | do_type(); | |
9746 | ||
9747 | void | |
9748 | do_determine_type(const Type_context*); | |
9749 | ||
9750 | void | |
9751 | do_check_types(Gogo*); | |
9752 | ||
9753 | Expression* | |
9754 | do_copy() | |
9755 | { | |
9756 | return Expression::make_array_index(this->array_->copy(), | |
9757 | this->start_->copy(), | |
9758 | (this->end_ == NULL | |
9759 | ? NULL | |
9760 | : this->end_->copy()), | |
acf2b673 | 9761 | (this->cap_ == NULL |
9762 | ? NULL | |
9763 | : this->cap_->copy()), | |
e440a328 | 9764 | this->location()); |
9765 | } | |
9766 | ||
baef9f7a | 9767 | bool |
9768 | do_must_eval_subexpressions_in_order(int* skip) const | |
9769 | { | |
9770 | *skip = 1; | |
9771 | return true; | |
9772 | } | |
9773 | ||
e440a328 | 9774 | bool |
9775 | do_is_addressable() const; | |
9776 | ||
9777 | void | |
9778 | do_address_taken(bool escapes) | |
9779 | { this->array_->address_taken(escapes); } | |
9780 | ||
56080003 | 9781 | void |
9782 | do_issue_nil_check() | |
9783 | { this->array_->issue_nil_check(); } | |
9784 | ||
ea664253 | 9785 | Bexpression* |
9786 | do_get_backend(Translate_context*); | |
e440a328 | 9787 | |
d751bb78 | 9788 | void |
9789 | do_dump_expression(Ast_dump_context*) const; | |
9790 | ||
e440a328 | 9791 | private: |
9792 | // The array we are getting a value from. | |
9793 | Expression* array_; | |
9794 | // The start or only index. | |
9795 | Expression* start_; | |
9796 | // The end index of a slice. This may be NULL for a simple array | |
9797 | // index, or it may be a nil expression for the length of the array. | |
9798 | Expression* end_; | |
acf2b673 | 9799 | // The capacity argument of a slice. This may be NULL for an array index or |
9800 | // slice. | |
9801 | Expression* cap_; | |
e440a328 | 9802 | // The type of the expression. |
9803 | Type* type_; | |
9804 | }; | |
9805 | ||
9806 | // Array index traversal. | |
9807 | ||
9808 | int | |
9809 | Array_index_expression::do_traverse(Traverse* traverse) | |
9810 | { | |
9811 | if (Expression::traverse(&this->array_, traverse) == TRAVERSE_EXIT) | |
9812 | return TRAVERSE_EXIT; | |
9813 | if (Expression::traverse(&this->start_, traverse) == TRAVERSE_EXIT) | |
9814 | return TRAVERSE_EXIT; | |
9815 | if (this->end_ != NULL) | |
9816 | { | |
9817 | if (Expression::traverse(&this->end_, traverse) == TRAVERSE_EXIT) | |
9818 | return TRAVERSE_EXIT; | |
9819 | } | |
acf2b673 | 9820 | if (this->cap_ != NULL) |
9821 | { | |
9822 | if (Expression::traverse(&this->cap_, traverse) == TRAVERSE_EXIT) | |
9823 | return TRAVERSE_EXIT; | |
9824 | } | |
e440a328 | 9825 | return TRAVERSE_CONTINUE; |
9826 | } | |
9827 | ||
9828 | // Return the type of an array index. | |
9829 | ||
9830 | Type* | |
9831 | Array_index_expression::do_type() | |
9832 | { | |
9833 | if (this->type_ == NULL) | |
9834 | { | |
9835 | Array_type* type = this->array_->type()->array_type(); | |
9836 | if (type == NULL) | |
9837 | this->type_ = Type::make_error_type(); | |
9838 | else if (this->end_ == NULL) | |
9839 | this->type_ = type->element_type(); | |
411eb89e | 9840 | else if (type->is_slice_type()) |
e440a328 | 9841 | { |
9842 | // A slice of a slice has the same type as the original | |
9843 | // slice. | |
9844 | this->type_ = this->array_->type()->deref(); | |
9845 | } | |
9846 | else | |
9847 | { | |
9848 | // A slice of an array is a slice. | |
9849 | this->type_ = Type::make_array_type(type->element_type(), NULL); | |
9850 | } | |
9851 | } | |
9852 | return this->type_; | |
9853 | } | |
9854 | ||
9855 | // Set the type of an array index. | |
9856 | ||
9857 | void | |
9858 | Array_index_expression::do_determine_type(const Type_context*) | |
9859 | { | |
9860 | this->array_->determine_type_no_context(); | |
7917ad68 | 9861 | this->start_->determine_type_no_context(); |
e440a328 | 9862 | if (this->end_ != NULL) |
7917ad68 | 9863 | this->end_->determine_type_no_context(); |
acf2b673 | 9864 | if (this->cap_ != NULL) |
9865 | this->cap_->determine_type_no_context(); | |
e440a328 | 9866 | } |
9867 | ||
9868 | // Check types of an array index. | |
9869 | ||
9870 | void | |
9871 | Array_index_expression::do_check_types(Gogo*) | |
9872 | { | |
f6bc81e6 | 9873 | Numeric_constant nc; |
9874 | unsigned long v; | |
9875 | if (this->start_->type()->integer_type() == NULL | |
9876 | && !this->start_->type()->is_error() | |
9877 | && (!this->start_->numeric_constant_value(&nc) | |
9878 | || nc.to_unsigned_long(&v) == Numeric_constant::NC_UL_NOTINT)) | |
e440a328 | 9879 | this->report_error(_("index must be integer")); |
9880 | if (this->end_ != NULL | |
9881 | && this->end_->type()->integer_type() == NULL | |
99b3f06f | 9882 | && !this->end_->type()->is_error() |
9883 | && !this->end_->is_nil_expression() | |
f6bc81e6 | 9884 | && !this->end_->is_error_expression() |
9885 | && (!this->end_->numeric_constant_value(&nc) | |
9886 | || nc.to_unsigned_long(&v) == Numeric_constant::NC_UL_NOTINT)) | |
e440a328 | 9887 | this->report_error(_("slice end must be integer")); |
acf2b673 | 9888 | if (this->cap_ != NULL |
9889 | && this->cap_->type()->integer_type() == NULL | |
9890 | && !this->cap_->type()->is_error() | |
9891 | && !this->cap_->is_nil_expression() | |
9892 | && !this->cap_->is_error_expression() | |
9893 | && (!this->cap_->numeric_constant_value(&nc) | |
9894 | || nc.to_unsigned_long(&v) == Numeric_constant::NC_UL_NOTINT)) | |
9895 | this->report_error(_("slice capacity must be integer")); | |
e440a328 | 9896 | |
9897 | Array_type* array_type = this->array_->type()->array_type(); | |
f9c68f17 | 9898 | if (array_type == NULL) |
9899 | { | |
c484d925 | 9900 | go_assert(this->array_->type()->is_error()); |
f9c68f17 | 9901 | return; |
9902 | } | |
e440a328 | 9903 | |
9904 | unsigned int int_bits = | |
9905 | Type::lookup_integer_type("int")->integer_type()->bits(); | |
9906 | ||
0c77715b | 9907 | Numeric_constant lvalnc; |
e440a328 | 9908 | mpz_t lval; |
e440a328 | 9909 | bool lval_valid = (array_type->length() != NULL |
0c77715b | 9910 | && array_type->length()->numeric_constant_value(&lvalnc) |
9911 | && lvalnc.to_int(&lval)); | |
9912 | Numeric_constant inc; | |
e440a328 | 9913 | mpz_t ival; |
0bd5d859 | 9914 | bool ival_valid = false; |
0c77715b | 9915 | if (this->start_->numeric_constant_value(&inc) && inc.to_int(&ival)) |
e440a328 | 9916 | { |
0bd5d859 | 9917 | ival_valid = true; |
e440a328 | 9918 | if (mpz_sgn(ival) < 0 |
9919 | || mpz_sizeinbase(ival, 2) >= int_bits | |
9920 | || (lval_valid | |
9921 | && (this->end_ == NULL | |
9922 | ? mpz_cmp(ival, lval) >= 0 | |
9923 | : mpz_cmp(ival, lval) > 0))) | |
9924 | { | |
9925 | error_at(this->start_->location(), "array index out of bounds"); | |
9926 | this->set_is_error(); | |
9927 | } | |
9928 | } | |
9929 | if (this->end_ != NULL && !this->end_->is_nil_expression()) | |
9930 | { | |
0c77715b | 9931 | Numeric_constant enc; |
9932 | mpz_t eval; | |
acf2b673 | 9933 | bool eval_valid = false; |
0c77715b | 9934 | if (this->end_->numeric_constant_value(&enc) && enc.to_int(&eval)) |
e440a328 | 9935 | { |
acf2b673 | 9936 | eval_valid = true; |
0c77715b | 9937 | if (mpz_sgn(eval) < 0 |
9938 | || mpz_sizeinbase(eval, 2) >= int_bits | |
9939 | || (lval_valid && mpz_cmp(eval, lval) > 0)) | |
e440a328 | 9940 | { |
9941 | error_at(this->end_->location(), "array index out of bounds"); | |
9942 | this->set_is_error(); | |
9943 | } | |
0bd5d859 | 9944 | else if (ival_valid && mpz_cmp(ival, eval) > 0) |
9945 | this->report_error(_("inverted slice range")); | |
e440a328 | 9946 | } |
acf2b673 | 9947 | |
9948 | Numeric_constant cnc; | |
9949 | mpz_t cval; | |
9950 | if (this->cap_ != NULL | |
9951 | && this->cap_->numeric_constant_value(&cnc) && cnc.to_int(&cval)) | |
9952 | { | |
9953 | if (mpz_sgn(cval) < 0 | |
9954 | || mpz_sizeinbase(cval, 2) >= int_bits | |
9955 | || (lval_valid && mpz_cmp(cval, lval) > 0)) | |
9956 | { | |
9957 | error_at(this->cap_->location(), "array index out of bounds"); | |
9958 | this->set_is_error(); | |
9959 | } | |
9960 | else if (ival_valid && mpz_cmp(ival, cval) > 0) | |
9961 | { | |
9962 | error_at(this->cap_->location(), | |
9963 | "invalid slice index: capacity less than start"); | |
9964 | this->set_is_error(); | |
9965 | } | |
9966 | else if (eval_valid && mpz_cmp(eval, cval) > 0) | |
9967 | { | |
9968 | error_at(this->cap_->location(), | |
9969 | "invalid slice index: capacity less than length"); | |
9970 | this->set_is_error(); | |
9971 | } | |
9972 | mpz_clear(cval); | |
9973 | } | |
9974 | ||
9975 | if (eval_valid) | |
9976 | mpz_clear(eval); | |
e440a328 | 9977 | } |
0bd5d859 | 9978 | if (ival_valid) |
9979 | mpz_clear(ival); | |
0c77715b | 9980 | if (lval_valid) |
9981 | mpz_clear(lval); | |
e440a328 | 9982 | |
9983 | // A slice of an array requires an addressable array. A slice of a | |
9984 | // slice is always possible. | |
411eb89e | 9985 | if (this->end_ != NULL && !array_type->is_slice_type()) |
88ec30c8 | 9986 | { |
9987 | if (!this->array_->is_addressable()) | |
8da39c3b | 9988 | this->report_error(_("slice of unaddressable value")); |
88ec30c8 | 9989 | else |
9990 | this->array_->address_taken(true); | |
9991 | } | |
e440a328 | 9992 | } |
9993 | ||
2c809f8f | 9994 | // Flatten array indexing by using temporary variables for slices and indexes. |
35a54f17 | 9995 | |
9996 | Expression* | |
9997 | Array_index_expression::do_flatten(Gogo*, Named_object*, | |
9998 | Statement_inserter* inserter) | |
9999 | { | |
10000 | Location loc = this->location(); | |
2c809f8f | 10001 | Temporary_statement* temp; |
35a54f17 | 10002 | if (this->array_->type()->is_slice_type() && !this->array_->is_variable()) |
10003 | { | |
2c809f8f | 10004 | temp = Statement::make_temporary(NULL, this->array_, loc); |
35a54f17 | 10005 | inserter->insert(temp); |
10006 | this->array_ = Expression::make_temporary_reference(temp, loc); | |
10007 | } | |
2c809f8f | 10008 | if (!this->start_->is_variable()) |
10009 | { | |
10010 | temp = Statement::make_temporary(NULL, this->start_, loc); | |
10011 | inserter->insert(temp); | |
10012 | this->start_ = Expression::make_temporary_reference(temp, loc); | |
10013 | } | |
10014 | if (this->end_ != NULL | |
10015 | && !this->end_->is_nil_expression() | |
10016 | && !this->end_->is_variable()) | |
10017 | { | |
10018 | temp = Statement::make_temporary(NULL, this->end_, loc); | |
10019 | inserter->insert(temp); | |
10020 | this->end_ = Expression::make_temporary_reference(temp, loc); | |
10021 | } | |
10022 | if (this->cap_ != NULL && !this->cap_->is_variable()) | |
10023 | { | |
10024 | temp = Statement::make_temporary(NULL, this->cap_, loc); | |
10025 | inserter->insert(temp); | |
10026 | this->cap_ = Expression::make_temporary_reference(temp, loc); | |
10027 | } | |
10028 | ||
35a54f17 | 10029 | return this; |
10030 | } | |
10031 | ||
e440a328 | 10032 | // Return whether this expression is addressable. |
10033 | ||
10034 | bool | |
10035 | Array_index_expression::do_is_addressable() const | |
10036 | { | |
10037 | // A slice expression is not addressable. | |
10038 | if (this->end_ != NULL) | |
10039 | return false; | |
10040 | ||
10041 | // An index into a slice is addressable. | |
411eb89e | 10042 | if (this->array_->type()->is_slice_type()) |
e440a328 | 10043 | return true; |
10044 | ||
10045 | // An index into an array is addressable if the array is | |
10046 | // addressable. | |
10047 | return this->array_->is_addressable(); | |
10048 | } | |
10049 | ||
ea664253 | 10050 | // Get the backend representation for an array index. |
e440a328 | 10051 | |
ea664253 | 10052 | Bexpression* |
10053 | Array_index_expression::do_get_backend(Translate_context* context) | |
e440a328 | 10054 | { |
e440a328 | 10055 | Array_type* array_type = this->array_->type()->array_type(); |
d8cd8e2d | 10056 | if (array_type == NULL) |
10057 | { | |
c484d925 | 10058 | go_assert(this->array_->type()->is_error()); |
ea664253 | 10059 | return context->backend()->error_expression(); |
d8cd8e2d | 10060 | } |
35a54f17 | 10061 | go_assert(!array_type->is_slice_type() || this->array_->is_variable()); |
e440a328 | 10062 | |
2c809f8f | 10063 | Location loc = this->location(); |
10064 | Gogo* gogo = context->gogo(); | |
10065 | ||
6dfedc16 | 10066 | Type* int_type = Type::lookup_integer_type("int"); |
10067 | Btype* int_btype = int_type->get_backend(gogo); | |
e440a328 | 10068 | |
2c809f8f | 10069 | // We need to convert the length and capacity to the Go "int" type here |
10070 | // because the length of a fixed-length array could be of type "uintptr" | |
10071 | // and gimple disallows binary operations between "uintptr" and other | |
10072 | // integer types. FIXME. | |
10073 | Bexpression* length = NULL; | |
a04bfdfc | 10074 | if (this->end_ == NULL || this->end_->is_nil_expression()) |
10075 | { | |
35a54f17 | 10076 | Expression* len = array_type->get_length(gogo, this->array_); |
ea664253 | 10077 | length = len->get_backend(context); |
2c809f8f | 10078 | length = gogo->backend()->convert_expression(int_btype, length, loc); |
a04bfdfc | 10079 | } |
10080 | ||
2c809f8f | 10081 | Bexpression* capacity = NULL; |
a04bfdfc | 10082 | if (this->end_ != NULL) |
10083 | { | |
35a54f17 | 10084 | Expression* cap = array_type->get_capacity(gogo, this->array_); |
ea664253 | 10085 | capacity = cap->get_backend(context); |
2c809f8f | 10086 | capacity = gogo->backend()->convert_expression(int_btype, capacity, loc); |
a04bfdfc | 10087 | } |
10088 | ||
2c809f8f | 10089 | Bexpression* cap_arg = capacity; |
acf2b673 | 10090 | if (this->cap_ != NULL) |
10091 | { | |
ea664253 | 10092 | cap_arg = this->cap_->get_backend(context); |
2c809f8f | 10093 | cap_arg = gogo->backend()->convert_expression(int_btype, cap_arg, loc); |
acf2b673 | 10094 | } |
10095 | ||
2c809f8f | 10096 | if (length == NULL) |
10097 | length = cap_arg; | |
e440a328 | 10098 | |
10099 | int code = (array_type->length() != NULL | |
10100 | ? (this->end_ == NULL | |
10101 | ? RUNTIME_ERROR_ARRAY_INDEX_OUT_OF_BOUNDS | |
10102 | : RUNTIME_ERROR_ARRAY_SLICE_OUT_OF_BOUNDS) | |
10103 | : (this->end_ == NULL | |
10104 | ? RUNTIME_ERROR_SLICE_INDEX_OUT_OF_BOUNDS | |
10105 | : RUNTIME_ERROR_SLICE_SLICE_OUT_OF_BOUNDS)); | |
ea664253 | 10106 | Bexpression* crash = gogo->runtime_error(code, loc)->get_backend(context); |
2c809f8f | 10107 | |
6dfedc16 | 10108 | if (this->start_->type()->integer_type() == NULL |
10109 | && !Type::are_convertible(int_type, this->start_->type(), NULL)) | |
10110 | { | |
10111 | go_assert(saw_errors()); | |
10112 | return context->backend()->error_expression(); | |
10113 | } | |
d9f3743a | 10114 | |
ea664253 | 10115 | Bexpression* bad_index = |
d9f3743a | 10116 | Expression::check_bounds(this->start_, loc)->get_backend(context); |
2c809f8f | 10117 | |
ea664253 | 10118 | Bexpression* start = this->start_->get_backend(context); |
2c809f8f | 10119 | start = gogo->backend()->convert_expression(int_btype, start, loc); |
10120 | Bexpression* start_too_large = | |
10121 | gogo->backend()->binary_expression((this->end_ == NULL | |
10122 | ? OPERATOR_GE | |
10123 | : OPERATOR_GT), | |
10124 | start, | |
10125 | (this->end_ == NULL | |
10126 | ? length | |
10127 | : capacity), | |
10128 | loc); | |
10129 | bad_index = gogo->backend()->binary_expression(OPERATOR_OROR, start_too_large, | |
10130 | bad_index, loc); | |
e440a328 | 10131 | |
10132 | if (this->end_ == NULL) | |
10133 | { | |
10134 | // Simple array indexing. This has to return an l-value, so | |
2c809f8f | 10135 | // wrap the index check into START. |
10136 | start = | |
10137 | gogo->backend()->conditional_expression(int_btype, bad_index, | |
10138 | crash, start, loc); | |
e440a328 | 10139 | |
2c809f8f | 10140 | Bexpression* ret; |
e440a328 | 10141 | if (array_type->length() != NULL) |
10142 | { | |
ea664253 | 10143 | Bexpression* array = this->array_->get_backend(context); |
2c809f8f | 10144 | ret = gogo->backend()->array_index_expression(array, start, loc); |
e440a328 | 10145 | } |
10146 | else | |
10147 | { | |
2c809f8f | 10148 | // Slice. |
10149 | Expression* valptr = | |
35a54f17 | 10150 | array_type->get_value_pointer(gogo, this->array_); |
ea664253 | 10151 | Bexpression* ptr = valptr->get_backend(context); |
2c809f8f | 10152 | ptr = gogo->backend()->pointer_offset_expression(ptr, start, loc); |
9b27b43c | 10153 | |
10154 | Type* ele_type = this->array_->type()->array_type()->element_type(); | |
10155 | Btype* ele_btype = ele_type->get_backend(gogo); | |
10156 | ret = gogo->backend()->indirect_expression(ele_btype, ptr, true, loc); | |
e440a328 | 10157 | } |
ea664253 | 10158 | return ret; |
e440a328 | 10159 | } |
10160 | ||
10161 | // Array slice. | |
10162 | ||
acf2b673 | 10163 | if (this->cap_ != NULL) |
10164 | { | |
2c809f8f | 10165 | Bexpression* bounds_bcheck = |
ea664253 | 10166 | Expression::check_bounds(this->cap_, loc)->get_backend(context); |
2c809f8f | 10167 | bad_index = |
10168 | gogo->backend()->binary_expression(OPERATOR_OROR, bounds_bcheck, | |
10169 | bad_index, loc); | |
10170 | cap_arg = gogo->backend()->convert_expression(int_btype, cap_arg, loc); | |
10171 | ||
10172 | Bexpression* cap_too_small = | |
10173 | gogo->backend()->binary_expression(OPERATOR_LT, cap_arg, start, loc); | |
10174 | Bexpression* cap_too_large = | |
10175 | gogo->backend()->binary_expression(OPERATOR_GT, cap_arg, capacity, loc); | |
10176 | Bexpression* bad_cap = | |
10177 | gogo->backend()->binary_expression(OPERATOR_OROR, cap_too_small, | |
10178 | cap_too_large, loc); | |
10179 | bad_index = gogo->backend()->binary_expression(OPERATOR_OROR, bad_cap, | |
10180 | bad_index, loc); | |
10181 | } | |
10182 | ||
10183 | Bexpression* end; | |
e440a328 | 10184 | if (this->end_->is_nil_expression()) |
2c809f8f | 10185 | end = length; |
e440a328 | 10186 | else |
10187 | { | |
2c809f8f | 10188 | Bexpression* bounds_bcheck = |
ea664253 | 10189 | Expression::check_bounds(this->end_, loc)->get_backend(context); |
e440a328 | 10190 | |
2c809f8f | 10191 | bad_index = |
10192 | gogo->backend()->binary_expression(OPERATOR_OROR, bounds_bcheck, | |
10193 | bad_index, loc); | |
e440a328 | 10194 | |
ea664253 | 10195 | end = this->end_->get_backend(context); |
2c809f8f | 10196 | end = gogo->backend()->convert_expression(int_btype, end, loc); |
10197 | Bexpression* end_too_small = | |
10198 | gogo->backend()->binary_expression(OPERATOR_LT, end, start, loc); | |
10199 | Bexpression* end_too_large = | |
10200 | gogo->backend()->binary_expression(OPERATOR_GT, end, cap_arg, loc); | |
10201 | Bexpression* bad_end = | |
10202 | gogo->backend()->binary_expression(OPERATOR_OROR, end_too_small, | |
10203 | end_too_large, loc); | |
10204 | bad_index = gogo->backend()->binary_expression(OPERATOR_OROR, bad_end, | |
10205 | bad_index, loc); | |
e440a328 | 10206 | } |
10207 | ||
35a54f17 | 10208 | Expression* valptr = array_type->get_value_pointer(gogo, this->array_); |
ea664253 | 10209 | Bexpression* val = valptr->get_backend(context); |
2c809f8f | 10210 | val = gogo->backend()->pointer_offset_expression(val, start, loc); |
e440a328 | 10211 | |
2c809f8f | 10212 | Bexpression* result_length = |
10213 | gogo->backend()->binary_expression(OPERATOR_MINUS, end, start, loc); | |
e440a328 | 10214 | |
2c809f8f | 10215 | Bexpression* result_capacity = |
10216 | gogo->backend()->binary_expression(OPERATOR_MINUS, cap_arg, start, loc); | |
e440a328 | 10217 | |
2c809f8f | 10218 | Btype* struct_btype = this->type()->get_backend(gogo); |
10219 | std::vector<Bexpression*> init; | |
10220 | init.push_back(val); | |
10221 | init.push_back(result_length); | |
10222 | init.push_back(result_capacity); | |
e440a328 | 10223 | |
2c809f8f | 10224 | Bexpression* ctor = |
10225 | gogo->backend()->constructor_expression(struct_btype, init, loc); | |
ea664253 | 10226 | return gogo->backend()->conditional_expression(struct_btype, bad_index, |
10227 | crash, ctor, loc); | |
e440a328 | 10228 | } |
10229 | ||
d751bb78 | 10230 | // Dump ast representation for an array index expression. |
10231 | ||
10232 | void | |
10233 | Array_index_expression::do_dump_expression(Ast_dump_context* ast_dump_context) | |
10234 | const | |
10235 | { | |
10236 | Index_expression::dump_index_expression(ast_dump_context, this->array_, | |
acf2b673 | 10237 | this->start_, this->end_, this->cap_); |
d751bb78 | 10238 | } |
10239 | ||
acf2b673 | 10240 | // Make an array index expression. END and CAP may be NULL. |
e440a328 | 10241 | |
10242 | Expression* | |
10243 | Expression::make_array_index(Expression* array, Expression* start, | |
acf2b673 | 10244 | Expression* end, Expression* cap, |
10245 | Location location) | |
e440a328 | 10246 | { |
acf2b673 | 10247 | return new Array_index_expression(array, start, end, cap, location); |
e440a328 | 10248 | } |
10249 | ||
10250 | // A string index. This is used for both indexing and slicing. | |
10251 | ||
10252 | class String_index_expression : public Expression | |
10253 | { | |
10254 | public: | |
10255 | String_index_expression(Expression* string, Expression* start, | |
b13c66cd | 10256 | Expression* end, Location location) |
e440a328 | 10257 | : Expression(EXPRESSION_STRING_INDEX, location), |
10258 | string_(string), start_(start), end_(end) | |
10259 | { } | |
10260 | ||
10261 | protected: | |
10262 | int | |
10263 | do_traverse(Traverse*); | |
10264 | ||
2c809f8f | 10265 | Expression* |
10266 | do_flatten(Gogo*, Named_object*, Statement_inserter*); | |
10267 | ||
e440a328 | 10268 | Type* |
10269 | do_type(); | |
10270 | ||
10271 | void | |
10272 | do_determine_type(const Type_context*); | |
10273 | ||
10274 | void | |
10275 | do_check_types(Gogo*); | |
10276 | ||
10277 | Expression* | |
10278 | do_copy() | |
10279 | { | |
10280 | return Expression::make_string_index(this->string_->copy(), | |
10281 | this->start_->copy(), | |
10282 | (this->end_ == NULL | |
10283 | ? NULL | |
10284 | : this->end_->copy()), | |
10285 | this->location()); | |
10286 | } | |
10287 | ||
baef9f7a | 10288 | bool |
10289 | do_must_eval_subexpressions_in_order(int* skip) const | |
10290 | { | |
10291 | *skip = 1; | |
10292 | return true; | |
10293 | } | |
10294 | ||
ea664253 | 10295 | Bexpression* |
10296 | do_get_backend(Translate_context*); | |
e440a328 | 10297 | |
d751bb78 | 10298 | void |
10299 | do_dump_expression(Ast_dump_context*) const; | |
10300 | ||
e440a328 | 10301 | private: |
10302 | // The string we are getting a value from. | |
10303 | Expression* string_; | |
10304 | // The start or only index. | |
10305 | Expression* start_; | |
10306 | // The end index of a slice. This may be NULL for a single index, | |
10307 | // or it may be a nil expression for the length of the string. | |
10308 | Expression* end_; | |
10309 | }; | |
10310 | ||
10311 | // String index traversal. | |
10312 | ||
10313 | int | |
10314 | String_index_expression::do_traverse(Traverse* traverse) | |
10315 | { | |
10316 | if (Expression::traverse(&this->string_, traverse) == TRAVERSE_EXIT) | |
10317 | return TRAVERSE_EXIT; | |
10318 | if (Expression::traverse(&this->start_, traverse) == TRAVERSE_EXIT) | |
10319 | return TRAVERSE_EXIT; | |
10320 | if (this->end_ != NULL) | |
10321 | { | |
10322 | if (Expression::traverse(&this->end_, traverse) == TRAVERSE_EXIT) | |
10323 | return TRAVERSE_EXIT; | |
10324 | } | |
10325 | return TRAVERSE_CONTINUE; | |
10326 | } | |
10327 | ||
2c809f8f | 10328 | Expression* |
10329 | String_index_expression::do_flatten(Gogo*, Named_object*, | |
10330 | Statement_inserter* inserter) | |
e440a328 | 10331 | { |
2c809f8f | 10332 | Temporary_statement* temp; |
10333 | Location loc = this->location(); | |
10334 | if (!this->string_->is_variable()) | |
10335 | { | |
10336 | temp = Statement::make_temporary(NULL, this->string_, loc); | |
10337 | inserter->insert(temp); | |
10338 | this->string_ = Expression::make_temporary_reference(temp, loc); | |
10339 | } | |
10340 | if (!this->start_->is_variable()) | |
10341 | { | |
10342 | temp = Statement::make_temporary(NULL, this->start_, loc); | |
10343 | inserter->insert(temp); | |
10344 | this->start_ = Expression::make_temporary_reference(temp, loc); | |
10345 | } | |
10346 | if (this->end_ != NULL | |
10347 | && !this->end_->is_nil_expression() | |
10348 | && !this->end_->is_variable()) | |
10349 | { | |
10350 | temp = Statement::make_temporary(NULL, this->end_, loc); | |
10351 | inserter->insert(temp); | |
10352 | this->end_ = Expression::make_temporary_reference(temp, loc); | |
10353 | } | |
10354 | ||
10355 | return this; | |
10356 | } | |
10357 | ||
10358 | // Return the type of a string index. | |
10359 | ||
10360 | Type* | |
10361 | String_index_expression::do_type() | |
10362 | { | |
10363 | if (this->end_ == NULL) | |
10364 | return Type::lookup_integer_type("uint8"); | |
10365 | else | |
10366 | return this->string_->type(); | |
10367 | } | |
10368 | ||
10369 | // Determine the type of a string index. | |
10370 | ||
10371 | void | |
10372 | String_index_expression::do_determine_type(const Type_context*) | |
10373 | { | |
10374 | this->string_->determine_type_no_context(); | |
10375 | this->start_->determine_type_no_context(); | |
e440a328 | 10376 | if (this->end_ != NULL) |
93000773 | 10377 | this->end_->determine_type_no_context(); |
e440a328 | 10378 | } |
10379 | ||
10380 | // Check types of a string index. | |
10381 | ||
10382 | void | |
10383 | String_index_expression::do_check_types(Gogo*) | |
10384 | { | |
acdc230d | 10385 | Numeric_constant nc; |
10386 | unsigned long v; | |
10387 | if (this->start_->type()->integer_type() == NULL | |
10388 | && !this->start_->type()->is_error() | |
10389 | && (!this->start_->numeric_constant_value(&nc) | |
10390 | || nc.to_unsigned_long(&v) == Numeric_constant::NC_UL_NOTINT)) | |
e440a328 | 10391 | this->report_error(_("index must be integer")); |
10392 | if (this->end_ != NULL | |
10393 | && this->end_->type()->integer_type() == NULL | |
acdc230d | 10394 | && !this->end_->type()->is_error() |
10395 | && !this->end_->is_nil_expression() | |
10396 | && !this->end_->is_error_expression() | |
10397 | && (!this->end_->numeric_constant_value(&nc) | |
10398 | || nc.to_unsigned_long(&v) == Numeric_constant::NC_UL_NOTINT)) | |
e440a328 | 10399 | this->report_error(_("slice end must be integer")); |
10400 | ||
10401 | std::string sval; | |
10402 | bool sval_valid = this->string_->string_constant_value(&sval); | |
10403 | ||
0c77715b | 10404 | Numeric_constant inc; |
e440a328 | 10405 | mpz_t ival; |
0bd5d859 | 10406 | bool ival_valid = false; |
0c77715b | 10407 | if (this->start_->numeric_constant_value(&inc) && inc.to_int(&ival)) |
e440a328 | 10408 | { |
0bd5d859 | 10409 | ival_valid = true; |
e440a328 | 10410 | if (mpz_sgn(ival) < 0 |
10411 | || (sval_valid && mpz_cmp_ui(ival, sval.length()) >= 0)) | |
10412 | { | |
10413 | error_at(this->start_->location(), "string index out of bounds"); | |
10414 | this->set_is_error(); | |
10415 | } | |
10416 | } | |
10417 | if (this->end_ != NULL && !this->end_->is_nil_expression()) | |
10418 | { | |
0c77715b | 10419 | Numeric_constant enc; |
10420 | mpz_t eval; | |
10421 | if (this->end_->numeric_constant_value(&enc) && enc.to_int(&eval)) | |
e440a328 | 10422 | { |
0c77715b | 10423 | if (mpz_sgn(eval) < 0 |
10424 | || (sval_valid && mpz_cmp_ui(eval, sval.length()) > 0)) | |
e440a328 | 10425 | { |
10426 | error_at(this->end_->location(), "string index out of bounds"); | |
10427 | this->set_is_error(); | |
10428 | } | |
0bd5d859 | 10429 | else if (ival_valid && mpz_cmp(ival, eval) > 0) |
10430 | this->report_error(_("inverted slice range")); | |
0c77715b | 10431 | mpz_clear(eval); |
e440a328 | 10432 | } |
10433 | } | |
0bd5d859 | 10434 | if (ival_valid) |
10435 | mpz_clear(ival); | |
e440a328 | 10436 | } |
10437 | ||
ea664253 | 10438 | // Get the backend representation for a string index. |
e440a328 | 10439 | |
ea664253 | 10440 | Bexpression* |
10441 | String_index_expression::do_get_backend(Translate_context* context) | |
e440a328 | 10442 | { |
b13c66cd | 10443 | Location loc = this->location(); |
2c809f8f | 10444 | Expression* string_arg = this->string_; |
10445 | if (this->string_->type()->points_to() != NULL) | |
10446 | string_arg = Expression::make_unary(OPERATOR_MULT, this->string_, loc); | |
e440a328 | 10447 | |
2c809f8f | 10448 | Expression* bad_index = Expression::check_bounds(this->start_, loc); |
e440a328 | 10449 | |
2c809f8f | 10450 | int code = (this->end_ == NULL |
10451 | ? RUNTIME_ERROR_STRING_INDEX_OUT_OF_BOUNDS | |
10452 | : RUNTIME_ERROR_STRING_SLICE_OUT_OF_BOUNDS); | |
e440a328 | 10453 | |
2c809f8f | 10454 | Gogo* gogo = context->gogo(); |
ea664253 | 10455 | Bexpression* crash = gogo->runtime_error(code, loc)->get_backend(context); |
1b1f2abf | 10456 | |
10457 | Type* int_type = Type::lookup_integer_type("int"); | |
e440a328 | 10458 | |
2c809f8f | 10459 | // It is possible that an error occurred earlier because the start index |
10460 | // cannot be represented as an integer type. In this case, we shouldn't | |
10461 | // try casting the starting index into an integer since | |
10462 | // Type_conversion_expression will fail to get the backend representation. | |
10463 | // FIXME. | |
10464 | if (this->start_->type()->integer_type() == NULL | |
10465 | && !Type::are_convertible(int_type, this->start_->type(), NULL)) | |
10466 | { | |
10467 | go_assert(saw_errors()); | |
ea664253 | 10468 | return context->backend()->error_expression(); |
2c809f8f | 10469 | } |
e440a328 | 10470 | |
2c809f8f | 10471 | Expression* start = Expression::make_cast(int_type, this->start_, loc); |
e440a328 | 10472 | |
2c809f8f | 10473 | if (this->end_ == NULL) |
10474 | { | |
10475 | Expression* length = | |
10476 | Expression::make_string_info(this->string_, STRING_INFO_LENGTH, loc); | |
e440a328 | 10477 | |
2c809f8f | 10478 | Expression* start_too_large = |
10479 | Expression::make_binary(OPERATOR_GE, start, length, loc); | |
10480 | bad_index = Expression::make_binary(OPERATOR_OROR, start_too_large, | |
10481 | bad_index, loc); | |
10482 | Expression* bytes = | |
10483 | Expression::make_string_info(this->string_, STRING_INFO_DATA, loc); | |
e440a328 | 10484 | |
ea664253 | 10485 | Bexpression* bstart = start->get_backend(context); |
10486 | Bexpression* ptr = bytes->get_backend(context); | |
2c809f8f | 10487 | ptr = gogo->backend()->pointer_offset_expression(ptr, bstart, loc); |
9b27b43c | 10488 | Btype* ubtype = Type::lookup_integer_type("uint8")->get_backend(gogo); |
10489 | Bexpression* index = | |
10490 | gogo->backend()->indirect_expression(ubtype, ptr, true, loc); | |
e440a328 | 10491 | |
2c809f8f | 10492 | Btype* byte_btype = bytes->type()->points_to()->get_backend(gogo); |
ea664253 | 10493 | Bexpression* index_error = bad_index->get_backend(context); |
10494 | return gogo->backend()->conditional_expression(byte_btype, index_error, | |
10495 | crash, index, loc); | |
2c809f8f | 10496 | } |
10497 | ||
10498 | Expression* end = NULL; | |
10499 | if (this->end_->is_nil_expression()) | |
e67508fa | 10500 | end = Expression::make_integer_sl(-1, int_type, loc); |
e440a328 | 10501 | else |
10502 | { | |
2c809f8f | 10503 | Expression* bounds_check = Expression::check_bounds(this->end_, loc); |
10504 | bad_index = | |
10505 | Expression::make_binary(OPERATOR_OROR, bounds_check, bad_index, loc); | |
10506 | end = Expression::make_cast(int_type, this->end_, loc); | |
e440a328 | 10507 | } |
2c809f8f | 10508 | |
10509 | Expression* strslice = Runtime::make_call(Runtime::STRING_SLICE, loc, 3, | |
10510 | string_arg, start, end); | |
ea664253 | 10511 | Bexpression* bstrslice = strslice->get_backend(context); |
2c809f8f | 10512 | |
10513 | Btype* str_btype = strslice->type()->get_backend(gogo); | |
ea664253 | 10514 | Bexpression* index_error = bad_index->get_backend(context); |
10515 | return gogo->backend()->conditional_expression(str_btype, index_error, | |
10516 | crash, bstrslice, loc); | |
e440a328 | 10517 | } |
10518 | ||
d751bb78 | 10519 | // Dump ast representation for a string index expression. |
10520 | ||
10521 | void | |
10522 | String_index_expression::do_dump_expression(Ast_dump_context* ast_dump_context) | |
10523 | const | |
10524 | { | |
acf2b673 | 10525 | Index_expression::dump_index_expression(ast_dump_context, this->string_, |
10526 | this->start_, this->end_, NULL); | |
d751bb78 | 10527 | } |
10528 | ||
e440a328 | 10529 | // Make a string index expression. END may be NULL. |
10530 | ||
10531 | Expression* | |
10532 | Expression::make_string_index(Expression* string, Expression* start, | |
b13c66cd | 10533 | Expression* end, Location location) |
e440a328 | 10534 | { |
10535 | return new String_index_expression(string, start, end, location); | |
10536 | } | |
10537 | ||
10538 | // Class Map_index. | |
10539 | ||
10540 | // Get the type of the map. | |
10541 | ||
10542 | Map_type* | |
10543 | Map_index_expression::get_map_type() const | |
10544 | { | |
10545 | Map_type* mt = this->map_->type()->deref()->map_type(); | |
c7524fae | 10546 | if (mt == NULL) |
c484d925 | 10547 | go_assert(saw_errors()); |
e440a328 | 10548 | return mt; |
10549 | } | |
10550 | ||
10551 | // Map index traversal. | |
10552 | ||
10553 | int | |
10554 | Map_index_expression::do_traverse(Traverse* traverse) | |
10555 | { | |
10556 | if (Expression::traverse(&this->map_, traverse) == TRAVERSE_EXIT) | |
10557 | return TRAVERSE_EXIT; | |
10558 | return Expression::traverse(&this->index_, traverse); | |
10559 | } | |
10560 | ||
2c809f8f | 10561 | // We need to pass in a pointer to the key, so flatten the index into a |
10562 | // temporary variable if it isn't already. The value pointer will be | |
10563 | // dereferenced and checked for nil, so flatten into a temporary to avoid | |
10564 | // recomputation. | |
10565 | ||
10566 | Expression* | |
10567 | Map_index_expression::do_flatten(Gogo*, Named_object*, | |
10568 | Statement_inserter* inserter) | |
10569 | { | |
10570 | Map_type* mt = this->get_map_type(); | |
10571 | if (this->index_->type() != mt->key_type()) | |
10572 | this->index_ = Expression::make_cast(mt->key_type(), this->index_, | |
10573 | this->location()); | |
10574 | ||
10575 | if (!this->index_->is_variable()) | |
10576 | { | |
10577 | Temporary_statement* temp = Statement::make_temporary(NULL, this->index_, | |
10578 | this->location()); | |
10579 | inserter->insert(temp); | |
10580 | this->index_ = Expression::make_temporary_reference(temp, | |
10581 | this->location()); | |
10582 | } | |
10583 | ||
10584 | if (this->value_pointer_ == NULL) | |
10585 | this->get_value_pointer(this->is_lvalue_); | |
10586 | if (!this->value_pointer_->is_variable()) | |
10587 | { | |
10588 | Temporary_statement* temp = | |
10589 | Statement::make_temporary(NULL, this->value_pointer_, | |
10590 | this->location()); | |
10591 | inserter->insert(temp); | |
10592 | this->value_pointer_ = | |
10593 | Expression::make_temporary_reference(temp, this->location()); | |
10594 | } | |
10595 | ||
10596 | return this; | |
10597 | } | |
10598 | ||
e440a328 | 10599 | // Return the type of a map index. |
10600 | ||
10601 | Type* | |
10602 | Map_index_expression::do_type() | |
10603 | { | |
c7524fae | 10604 | Map_type* mt = this->get_map_type(); |
10605 | if (mt == NULL) | |
10606 | return Type::make_error_type(); | |
10607 | Type* type = mt->val_type(); | |
e440a328 | 10608 | // If this map index is in a tuple assignment, we actually return a |
10609 | // pointer to the value type. Tuple_map_assignment_statement is | |
10610 | // responsible for handling this correctly. We need to get the type | |
10611 | // right in case this gets assigned to a temporary variable. | |
10612 | if (this->is_in_tuple_assignment_) | |
10613 | type = Type::make_pointer_type(type); | |
10614 | return type; | |
10615 | } | |
10616 | ||
10617 | // Fix the type of a map index. | |
10618 | ||
10619 | void | |
10620 | Map_index_expression::do_determine_type(const Type_context*) | |
10621 | { | |
10622 | this->map_->determine_type_no_context(); | |
c7524fae | 10623 | Map_type* mt = this->get_map_type(); |
10624 | Type* key_type = mt == NULL ? NULL : mt->key_type(); | |
10625 | Type_context subcontext(key_type, false); | |
e440a328 | 10626 | this->index_->determine_type(&subcontext); |
10627 | } | |
10628 | ||
10629 | // Check types of a map index. | |
10630 | ||
10631 | void | |
10632 | Map_index_expression::do_check_types(Gogo*) | |
10633 | { | |
10634 | std::string reason; | |
c7524fae | 10635 | Map_type* mt = this->get_map_type(); |
10636 | if (mt == NULL) | |
10637 | return; | |
10638 | if (!Type::are_assignable(mt->key_type(), this->index_->type(), &reason)) | |
e440a328 | 10639 | { |
10640 | if (reason.empty()) | |
10641 | this->report_error(_("incompatible type for map index")); | |
10642 | else | |
10643 | { | |
10644 | error_at(this->location(), "incompatible type for map index (%s)", | |
10645 | reason.c_str()); | |
10646 | this->set_is_error(); | |
10647 | } | |
10648 | } | |
10649 | } | |
10650 | ||
ea664253 | 10651 | // Get the backend representation for a map index. |
e440a328 | 10652 | |
ea664253 | 10653 | Bexpression* |
10654 | Map_index_expression::do_get_backend(Translate_context* context) | |
e440a328 | 10655 | { |
10656 | Map_type* type = this->get_map_type(); | |
c7524fae | 10657 | if (type == NULL) |
2c809f8f | 10658 | { |
10659 | go_assert(saw_errors()); | |
ea664253 | 10660 | return context->backend()->error_expression(); |
2c809f8f | 10661 | } |
e440a328 | 10662 | |
2c809f8f | 10663 | go_assert(this->value_pointer_ != NULL |
10664 | && this->value_pointer_->is_variable()); | |
e440a328 | 10665 | |
2c809f8f | 10666 | Bexpression* ret; |
e440a328 | 10667 | if (this->is_lvalue_) |
2c809f8f | 10668 | { |
10669 | Expression* val = | |
10670 | Expression::make_unary(OPERATOR_MULT, this->value_pointer_, | |
10671 | this->location()); | |
ea664253 | 10672 | ret = val->get_backend(context); |
2c809f8f | 10673 | } |
e440a328 | 10674 | else if (this->is_in_tuple_assignment_) |
10675 | { | |
10676 | // Tuple_map_assignment_statement is responsible for using this | |
10677 | // appropriately. | |
ea664253 | 10678 | ret = this->value_pointer_->get_backend(context); |
e440a328 | 10679 | } |
10680 | else | |
10681 | { | |
2c809f8f | 10682 | Location loc = this->location(); |
10683 | ||
10684 | Expression* nil_check = | |
10685 | Expression::make_binary(OPERATOR_EQEQ, this->value_pointer_, | |
10686 | Expression::make_nil(loc), loc); | |
ea664253 | 10687 | Bexpression* bnil_check = nil_check->get_backend(context); |
2c809f8f | 10688 | Expression* val = |
10689 | Expression::make_unary(OPERATOR_MULT, this->value_pointer_, loc); | |
ea664253 | 10690 | Bexpression* bval = val->get_backend(context); |
2c809f8f | 10691 | |
63697958 | 10692 | Gogo* gogo = context->gogo(); |
10693 | Btype* val_btype = type->val_type()->get_backend(gogo); | |
10694 | Bexpression* val_zero = gogo->backend()->zero_expression(val_btype); | |
2c809f8f | 10695 | ret = gogo->backend()->conditional_expression(val_btype, bnil_check, |
10696 | val_zero, bval, loc); | |
e440a328 | 10697 | } |
ea664253 | 10698 | return ret; |
e440a328 | 10699 | } |
10700 | ||
2c809f8f | 10701 | // Get an expression for the map index. This returns an expression which |
10702 | // evaluates to a pointer to a value. The pointer will be NULL if the key is | |
e440a328 | 10703 | // not in the map. |
10704 | ||
2c809f8f | 10705 | Expression* |
10706 | Map_index_expression::get_value_pointer(bool insert) | |
e440a328 | 10707 | { |
2c809f8f | 10708 | if (this->value_pointer_ == NULL) |
746d2e73 | 10709 | { |
2c809f8f | 10710 | Map_type* type = this->get_map_type(); |
10711 | if (type == NULL) | |
746d2e73 | 10712 | { |
2c809f8f | 10713 | go_assert(saw_errors()); |
10714 | return Expression::make_error(this->location()); | |
746d2e73 | 10715 | } |
e440a328 | 10716 | |
2c809f8f | 10717 | Location loc = this->location(); |
10718 | Expression* map_ref = this->map_; | |
10719 | if (this->map_->type()->points_to() != NULL) | |
10720 | map_ref = Expression::make_unary(OPERATOR_MULT, map_ref, loc); | |
e440a328 | 10721 | |
2c809f8f | 10722 | Expression* index_ptr = Expression::make_unary(OPERATOR_AND, this->index_, |
10723 | loc); | |
10724 | Expression* map_index = | |
10725 | Runtime::make_call(Runtime::MAP_INDEX, loc, 3, | |
10726 | map_ref, index_ptr, | |
10727 | Expression::make_boolean(insert, loc)); | |
10728 | ||
10729 | Type* val_type = type->val_type(); | |
10730 | this->value_pointer_ = | |
10731 | Expression::make_unsafe_cast(Type::make_pointer_type(val_type), | |
10732 | map_index, this->location()); | |
10733 | } | |
10734 | return this->value_pointer_; | |
e440a328 | 10735 | } |
10736 | ||
d751bb78 | 10737 | // Dump ast representation for a map index expression |
10738 | ||
10739 | void | |
10740 | Map_index_expression::do_dump_expression(Ast_dump_context* ast_dump_context) | |
10741 | const | |
10742 | { | |
acf2b673 | 10743 | Index_expression::dump_index_expression(ast_dump_context, this->map_, |
10744 | this->index_, NULL, NULL); | |
d751bb78 | 10745 | } |
10746 | ||
e440a328 | 10747 | // Make a map index expression. |
10748 | ||
10749 | Map_index_expression* | |
10750 | Expression::make_map_index(Expression* map, Expression* index, | |
b13c66cd | 10751 | Location location) |
e440a328 | 10752 | { |
10753 | return new Map_index_expression(map, index, location); | |
10754 | } | |
10755 | ||
10756 | // Class Field_reference_expression. | |
10757 | ||
149eabc5 | 10758 | // Lower a field reference expression. There is nothing to lower, but |
10759 | // this is where we generate the tracking information for fields with | |
10760 | // the magic go:"track" tag. | |
10761 | ||
10762 | Expression* | |
10763 | Field_reference_expression::do_lower(Gogo* gogo, Named_object* function, | |
10764 | Statement_inserter* inserter, int) | |
10765 | { | |
10766 | Struct_type* struct_type = this->expr_->type()->struct_type(); | |
10767 | if (struct_type == NULL) | |
10768 | { | |
10769 | // Error will be reported elsewhere. | |
10770 | return this; | |
10771 | } | |
10772 | const Struct_field* field = struct_type->field(this->field_index_); | |
10773 | if (field == NULL) | |
10774 | return this; | |
10775 | if (!field->has_tag()) | |
10776 | return this; | |
10777 | if (field->tag().find("go:\"track\"") == std::string::npos) | |
10778 | return this; | |
10779 | ||
604e278d | 10780 | // References from functions generated by the compiler don't count. |
c6292d1d | 10781 | if (function != NULL && function->func_value()->is_type_specific_function()) |
604e278d | 10782 | return this; |
10783 | ||
149eabc5 | 10784 | // We have found a reference to a tracked field. Build a call to |
10785 | // the runtime function __go_fieldtrack with a string that describes | |
10786 | // the field. FIXME: We should only call this once per referenced | |
10787 | // field per function, not once for each reference to the field. | |
10788 | ||
10789 | if (this->called_fieldtrack_) | |
10790 | return this; | |
10791 | this->called_fieldtrack_ = true; | |
10792 | ||
10793 | Location loc = this->location(); | |
10794 | ||
10795 | std::string s = "fieldtrack \""; | |
10796 | Named_type* nt = this->expr_->type()->named_type(); | |
10797 | if (nt == NULL || nt->named_object()->package() == NULL) | |
10798 | s.append(gogo->pkgpath()); | |
10799 | else | |
10800 | s.append(nt->named_object()->package()->pkgpath()); | |
10801 | s.push_back('.'); | |
10802 | if (nt != NULL) | |
5c29ad36 | 10803 | s.append(Gogo::unpack_hidden_name(nt->name())); |
149eabc5 | 10804 | s.push_back('.'); |
10805 | s.append(field->field_name()); | |
10806 | s.push_back('"'); | |
10807 | ||
10808 | // We can't use a string here, because internally a string holds a | |
10809 | // pointer to the actual bytes; when the linker garbage collects the | |
10810 | // string, it won't garbage collect the bytes. So we use a | |
10811 | // [...]byte. | |
10812 | ||
e67508fa | 10813 | Expression* length_expr = Expression::make_integer_ul(s.length(), NULL, loc); |
149eabc5 | 10814 | |
10815 | Type* byte_type = gogo->lookup_global("byte")->type_value(); | |
10816 | Type* array_type = Type::make_array_type(byte_type, length_expr); | |
10817 | ||
10818 | Expression_list* bytes = new Expression_list(); | |
10819 | for (std::string::const_iterator p = s.begin(); p != s.end(); p++) | |
10820 | { | |
e67508fa | 10821 | unsigned char c = static_cast<unsigned char>(*p); |
10822 | bytes->push_back(Expression::make_integer_ul(c, NULL, loc)); | |
149eabc5 | 10823 | } |
10824 | ||
10825 | Expression* e = Expression::make_composite_literal(array_type, 0, false, | |
62750cd5 | 10826 | bytes, false, loc); |
149eabc5 | 10827 | |
10828 | Variable* var = new Variable(array_type, e, true, false, false, loc); | |
10829 | ||
10830 | static int count; | |
10831 | char buf[50]; | |
10832 | snprintf(buf, sizeof buf, "fieldtrack.%d", count); | |
10833 | ++count; | |
10834 | ||
10835 | Named_object* no = gogo->add_variable(buf, var); | |
10836 | e = Expression::make_var_reference(no, loc); | |
10837 | e = Expression::make_unary(OPERATOR_AND, e, loc); | |
10838 | ||
10839 | Expression* call = Runtime::make_call(Runtime::FIELDTRACK, loc, 1, e); | |
604e278d | 10840 | gogo->lower_expression(function, inserter, &call); |
149eabc5 | 10841 | inserter->insert(Statement::make_statement(call, false)); |
10842 | ||
10843 | // Put this function, and the global variable we just created, into | |
10844 | // unique sections. This will permit the linker to garbage collect | |
10845 | // them if they are not referenced. The effect is that the only | |
10846 | // strings, indicating field references, that will wind up in the | |
10847 | // executable will be those for functions that are actually needed. | |
66a6be58 | 10848 | if (function != NULL) |
10849 | function->func_value()->set_in_unique_section(); | |
149eabc5 | 10850 | var->set_in_unique_section(); |
10851 | ||
10852 | return this; | |
10853 | } | |
10854 | ||
e440a328 | 10855 | // Return the type of a field reference. |
10856 | ||
10857 | Type* | |
10858 | Field_reference_expression::do_type() | |
10859 | { | |
b0e628fb | 10860 | Type* type = this->expr_->type(); |
5c13bd80 | 10861 | if (type->is_error()) |
b0e628fb | 10862 | return type; |
10863 | Struct_type* struct_type = type->struct_type(); | |
c484d925 | 10864 | go_assert(struct_type != NULL); |
e440a328 | 10865 | return struct_type->field(this->field_index_)->type(); |
10866 | } | |
10867 | ||
10868 | // Check the types for a field reference. | |
10869 | ||
10870 | void | |
10871 | Field_reference_expression::do_check_types(Gogo*) | |
10872 | { | |
b0e628fb | 10873 | Type* type = this->expr_->type(); |
5c13bd80 | 10874 | if (type->is_error()) |
b0e628fb | 10875 | return; |
10876 | Struct_type* struct_type = type->struct_type(); | |
c484d925 | 10877 | go_assert(struct_type != NULL); |
10878 | go_assert(struct_type->field(this->field_index_) != NULL); | |
e440a328 | 10879 | } |
10880 | ||
ea664253 | 10881 | // Get the backend representation for a field reference. |
e440a328 | 10882 | |
ea664253 | 10883 | Bexpression* |
10884 | Field_reference_expression::do_get_backend(Translate_context* context) | |
e440a328 | 10885 | { |
ea664253 | 10886 | Bexpression* bstruct = this->expr_->get_backend(context); |
10887 | return context->gogo()->backend()->struct_field_expression(bstruct, | |
10888 | this->field_index_, | |
10889 | this->location()); | |
e440a328 | 10890 | } |
10891 | ||
d751bb78 | 10892 | // Dump ast representation for a field reference expression. |
10893 | ||
10894 | void | |
10895 | Field_reference_expression::do_dump_expression( | |
10896 | Ast_dump_context* ast_dump_context) const | |
10897 | { | |
10898 | this->expr_->dump_expression(ast_dump_context); | |
10899 | ast_dump_context->ostream() << "." << this->field_index_; | |
10900 | } | |
10901 | ||
e440a328 | 10902 | // Make a reference to a qualified identifier in an expression. |
10903 | ||
10904 | Field_reference_expression* | |
10905 | Expression::make_field_reference(Expression* expr, unsigned int field_index, | |
b13c66cd | 10906 | Location location) |
e440a328 | 10907 | { |
10908 | return new Field_reference_expression(expr, field_index, location); | |
10909 | } | |
10910 | ||
10911 | // Class Interface_field_reference_expression. | |
10912 | ||
2387f644 | 10913 | // Return an expression for the pointer to the function to call. |
e440a328 | 10914 | |
2387f644 | 10915 | Expression* |
10916 | Interface_field_reference_expression::get_function() | |
e440a328 | 10917 | { |
2387f644 | 10918 | Expression* ref = this->expr_; |
10919 | Location loc = this->location(); | |
10920 | if (ref->type()->points_to() != NULL) | |
10921 | ref = Expression::make_unary(OPERATOR_MULT, ref, loc); | |
e440a328 | 10922 | |
2387f644 | 10923 | Expression* mtable = |
10924 | Expression::make_interface_info(ref, INTERFACE_INFO_METHODS, loc); | |
10925 | Struct_type* mtable_type = mtable->type()->points_to()->struct_type(); | |
e440a328 | 10926 | |
10927 | std::string name = Gogo::unpack_hidden_name(this->name_); | |
2387f644 | 10928 | unsigned int index; |
10929 | const Struct_field* field = mtable_type->find_local_field(name, &index); | |
10930 | go_assert(field != NULL); | |
10931 | mtable = Expression::make_unary(OPERATOR_MULT, mtable, loc); | |
10932 | return Expression::make_field_reference(mtable, index, loc); | |
e440a328 | 10933 | } |
10934 | ||
2387f644 | 10935 | // Return an expression for the first argument to pass to the interface |
e440a328 | 10936 | // function. |
10937 | ||
2387f644 | 10938 | Expression* |
10939 | Interface_field_reference_expression::get_underlying_object() | |
e440a328 | 10940 | { |
2387f644 | 10941 | Expression* expr = this->expr_; |
10942 | if (expr->type()->points_to() != NULL) | |
10943 | expr = Expression::make_unary(OPERATOR_MULT, expr, this->location()); | |
10944 | return Expression::make_interface_info(expr, INTERFACE_INFO_OBJECT, | |
10945 | this->location()); | |
e440a328 | 10946 | } |
10947 | ||
10948 | // Traversal. | |
10949 | ||
10950 | int | |
10951 | Interface_field_reference_expression::do_traverse(Traverse* traverse) | |
10952 | { | |
10953 | return Expression::traverse(&this->expr_, traverse); | |
10954 | } | |
10955 | ||
0afbb937 | 10956 | // Lower the expression. If this expression is not called, we need to |
10957 | // evaluate the expression twice when converting to the backend | |
10958 | // interface. So introduce a temporary variable if necessary. | |
10959 | ||
10960 | Expression* | |
9782d556 | 10961 | Interface_field_reference_expression::do_flatten(Gogo*, Named_object*, |
10962 | Statement_inserter* inserter) | |
0afbb937 | 10963 | { |
2387f644 | 10964 | if (!this->expr_->is_variable()) |
0afbb937 | 10965 | { |
10966 | Temporary_statement* temp = | |
10967 | Statement::make_temporary(this->expr_->type(), NULL, this->location()); | |
10968 | inserter->insert(temp); | |
10969 | this->expr_ = Expression::make_set_and_use_temporary(temp, this->expr_, | |
10970 | this->location()); | |
10971 | } | |
10972 | return this; | |
10973 | } | |
10974 | ||
e440a328 | 10975 | // Return the type of an interface field reference. |
10976 | ||
10977 | Type* | |
10978 | Interface_field_reference_expression::do_type() | |
10979 | { | |
10980 | Type* expr_type = this->expr_->type(); | |
10981 | ||
10982 | Type* points_to = expr_type->points_to(); | |
10983 | if (points_to != NULL) | |
10984 | expr_type = points_to; | |
10985 | ||
10986 | Interface_type* interface_type = expr_type->interface_type(); | |
10987 | if (interface_type == NULL) | |
10988 | return Type::make_error_type(); | |
10989 | ||
10990 | const Typed_identifier* method = interface_type->find_method(this->name_); | |
10991 | if (method == NULL) | |
10992 | return Type::make_error_type(); | |
10993 | ||
10994 | return method->type(); | |
10995 | } | |
10996 | ||
10997 | // Determine types. | |
10998 | ||
10999 | void | |
11000 | Interface_field_reference_expression::do_determine_type(const Type_context*) | |
11001 | { | |
11002 | this->expr_->determine_type_no_context(); | |
11003 | } | |
11004 | ||
11005 | // Check the types for an interface field reference. | |
11006 | ||
11007 | void | |
11008 | Interface_field_reference_expression::do_check_types(Gogo*) | |
11009 | { | |
11010 | Type* type = this->expr_->type(); | |
11011 | ||
11012 | Type* points_to = type->points_to(); | |
11013 | if (points_to != NULL) | |
11014 | type = points_to; | |
11015 | ||
11016 | Interface_type* interface_type = type->interface_type(); | |
11017 | if (interface_type == NULL) | |
5c491127 | 11018 | { |
11019 | if (!type->is_error_type()) | |
11020 | this->report_error(_("expected interface or pointer to interface")); | |
11021 | } | |
e440a328 | 11022 | else |
11023 | { | |
11024 | const Typed_identifier* method = | |
11025 | interface_type->find_method(this->name_); | |
11026 | if (method == NULL) | |
11027 | { | |
11028 | error_at(this->location(), "method %qs not in interface", | |
11029 | Gogo::message_name(this->name_).c_str()); | |
11030 | this->set_is_error(); | |
11031 | } | |
11032 | } | |
11033 | } | |
11034 | ||
0afbb937 | 11035 | // If an interface field reference is not simply called, then it is |
11036 | // represented as a closure. The closure will hold a single variable, | |
11037 | // the value of the interface on which the method should be called. | |
11038 | // The function will be a simple thunk that pulls the value from the | |
11039 | // closure and calls the method with the remaining arguments. | |
11040 | ||
11041 | // Because method values are not common, we don't build all thunks for | |
11042 | // all possible interface methods, but instead only build them as we | |
11043 | // need them. In particular, we even build them on demand for | |
11044 | // interface methods defined in other packages. | |
11045 | ||
11046 | Interface_field_reference_expression::Interface_method_thunks | |
11047 | Interface_field_reference_expression::interface_method_thunks; | |
11048 | ||
11049 | // Find or create the thunk to call method NAME on TYPE. | |
11050 | ||
11051 | Named_object* | |
11052 | Interface_field_reference_expression::create_thunk(Gogo* gogo, | |
11053 | Interface_type* type, | |
11054 | const std::string& name) | |
11055 | { | |
11056 | std::pair<Interface_type*, Method_thunks*> val(type, NULL); | |
11057 | std::pair<Interface_method_thunks::iterator, bool> ins = | |
11058 | Interface_field_reference_expression::interface_method_thunks.insert(val); | |
11059 | if (ins.second) | |
11060 | { | |
11061 | // This is the first time we have seen this interface. | |
11062 | ins.first->second = new Method_thunks(); | |
11063 | } | |
11064 | ||
11065 | for (Method_thunks::const_iterator p = ins.first->second->begin(); | |
11066 | p != ins.first->second->end(); | |
11067 | p++) | |
11068 | if (p->first == name) | |
11069 | return p->second; | |
11070 | ||
11071 | Location loc = type->location(); | |
11072 | ||
11073 | const Typed_identifier* method_id = type->find_method(name); | |
11074 | if (method_id == NULL) | |
11075 | return Named_object::make_erroneous_name(Gogo::thunk_name()); | |
11076 | ||
11077 | Function_type* orig_fntype = method_id->type()->function_type(); | |
11078 | if (orig_fntype == NULL) | |
11079 | return Named_object::make_erroneous_name(Gogo::thunk_name()); | |
11080 | ||
11081 | Struct_field_list* sfl = new Struct_field_list(); | |
f8bdf81a | 11082 | // The type here is wrong--it should be the C function type. But it |
11083 | // doesn't really matter. | |
0afbb937 | 11084 | Type* vt = Type::make_pointer_type(Type::make_void_type()); |
11085 | sfl->push_back(Struct_field(Typed_identifier("fn.0", vt, loc))); | |
11086 | sfl->push_back(Struct_field(Typed_identifier("val.1", type, loc))); | |
11087 | Type* closure_type = Type::make_struct_type(sfl, loc); | |
11088 | closure_type = Type::make_pointer_type(closure_type); | |
11089 | ||
f8bdf81a | 11090 | Function_type* new_fntype = orig_fntype->copy_with_names(); |
0afbb937 | 11091 | |
11092 | Named_object* new_no = gogo->start_function(Gogo::thunk_name(), new_fntype, | |
11093 | false, loc); | |
11094 | ||
f8bdf81a | 11095 | Variable* cvar = new Variable(closure_type, NULL, false, false, false, loc); |
11096 | cvar->set_is_used(); | |
11097 | Named_object* cp = Named_object::make_variable("$closure", NULL, cvar); | |
11098 | new_no->func_value()->set_closure_var(cp); | |
0afbb937 | 11099 | |
f8bdf81a | 11100 | gogo->start_block(loc); |
0afbb937 | 11101 | |
11102 | // Field 0 of the closure is the function code pointer, field 1 is | |
11103 | // the value on which to invoke the method. | |
11104 | Expression* arg = Expression::make_var_reference(cp, loc); | |
11105 | arg = Expression::make_unary(OPERATOR_MULT, arg, loc); | |
11106 | arg = Expression::make_field_reference(arg, 1, loc); | |
11107 | ||
11108 | Expression *ifre = Expression::make_interface_field_reference(arg, name, | |
11109 | loc); | |
11110 | ||
11111 | const Typed_identifier_list* orig_params = orig_fntype->parameters(); | |
11112 | Expression_list* args; | |
11113 | if (orig_params == NULL || orig_params->empty()) | |
11114 | args = NULL; | |
11115 | else | |
11116 | { | |
11117 | const Typed_identifier_list* new_params = new_fntype->parameters(); | |
11118 | args = new Expression_list(); | |
11119 | for (Typed_identifier_list::const_iterator p = new_params->begin(); | |
f8bdf81a | 11120 | p != new_params->end(); |
0afbb937 | 11121 | ++p) |
11122 | { | |
11123 | Named_object* p_no = gogo->lookup(p->name(), NULL); | |
11124 | go_assert(p_no != NULL | |
11125 | && p_no->is_variable() | |
11126 | && p_no->var_value()->is_parameter()); | |
11127 | args->push_back(Expression::make_var_reference(p_no, loc)); | |
11128 | } | |
11129 | } | |
11130 | ||
11131 | Call_expression* call = Expression::make_call(ifre, args, | |
11132 | orig_fntype->is_varargs(), | |
11133 | loc); | |
11134 | call->set_varargs_are_lowered(); | |
11135 | ||
11136 | Statement* s = Statement::make_return_from_call(call, loc); | |
11137 | gogo->add_statement(s); | |
11138 | Block* b = gogo->finish_block(loc); | |
11139 | gogo->add_block(b, loc); | |
11140 | gogo->lower_block(new_no, b); | |
a32698ee | 11141 | gogo->flatten_block(new_no, b); |
0afbb937 | 11142 | gogo->finish_function(loc); |
11143 | ||
11144 | ins.first->second->push_back(std::make_pair(name, new_no)); | |
11145 | return new_no; | |
11146 | } | |
11147 | ||
ea664253 | 11148 | // Get the backend representation for a method value. |
e440a328 | 11149 | |
ea664253 | 11150 | Bexpression* |
11151 | Interface_field_reference_expression::do_get_backend(Translate_context* context) | |
e440a328 | 11152 | { |
0afbb937 | 11153 | Interface_type* type = this->expr_->type()->interface_type(); |
11154 | if (type == NULL) | |
11155 | { | |
11156 | go_assert(saw_errors()); | |
ea664253 | 11157 | return context->backend()->error_expression(); |
0afbb937 | 11158 | } |
11159 | ||
11160 | Named_object* thunk = | |
11161 | Interface_field_reference_expression::create_thunk(context->gogo(), | |
11162 | type, this->name_); | |
11163 | if (thunk->is_erroneous()) | |
11164 | { | |
11165 | go_assert(saw_errors()); | |
ea664253 | 11166 | return context->backend()->error_expression(); |
0afbb937 | 11167 | } |
11168 | ||
11169 | // FIXME: We should lower this earlier, but we can't it lower it in | |
11170 | // the lowering pass because at that point we don't know whether we | |
11171 | // need to create the thunk or not. If the expression is called, we | |
11172 | // don't need the thunk. | |
11173 | ||
11174 | Location loc = this->location(); | |
11175 | ||
11176 | Struct_field_list* fields = new Struct_field_list(); | |
11177 | fields->push_back(Struct_field(Typed_identifier("fn.0", | |
11178 | thunk->func_value()->type(), | |
11179 | loc))); | |
11180 | fields->push_back(Struct_field(Typed_identifier("val.1", | |
11181 | this->expr_->type(), | |
11182 | loc))); | |
11183 | Struct_type* st = Type::make_struct_type(fields, loc); | |
11184 | ||
11185 | Expression_list* vals = new Expression_list(); | |
11186 | vals->push_back(Expression::make_func_code_reference(thunk, loc)); | |
11187 | vals->push_back(this->expr_); | |
11188 | ||
11189 | Expression* expr = Expression::make_struct_composite_literal(st, vals, loc); | |
ea664253 | 11190 | Bexpression* bclosure = |
11191 | Expression::make_heap_expression(expr, loc)->get_backend(context); | |
0afbb937 | 11192 | |
2387f644 | 11193 | Expression* nil_check = |
11194 | Expression::make_binary(OPERATOR_EQEQ, this->expr_, | |
11195 | Expression::make_nil(loc), loc); | |
ea664253 | 11196 | Bexpression* bnil_check = nil_check->get_backend(context); |
0afbb937 | 11197 | |
2387f644 | 11198 | Gogo* gogo = context->gogo(); |
ea664253 | 11199 | Bexpression* bcrash = gogo->runtime_error(RUNTIME_ERROR_NIL_DEREFERENCE, |
11200 | loc)->get_backend(context); | |
2387f644 | 11201 | |
11202 | Bexpression* bcond = | |
a32698ee | 11203 | gogo->backend()->conditional_expression(NULL, bnil_check, bcrash, NULL, loc); |
2387f644 | 11204 | Bstatement* cond_statement = gogo->backend()->expression_statement(bcond); |
ea664253 | 11205 | return gogo->backend()->compound_expression(cond_statement, bclosure, loc); |
e440a328 | 11206 | } |
11207 | ||
d751bb78 | 11208 | // Dump ast representation for an interface field reference. |
11209 | ||
11210 | void | |
11211 | Interface_field_reference_expression::do_dump_expression( | |
11212 | Ast_dump_context* ast_dump_context) const | |
11213 | { | |
11214 | this->expr_->dump_expression(ast_dump_context); | |
11215 | ast_dump_context->ostream() << "." << this->name_; | |
11216 | } | |
11217 | ||
e440a328 | 11218 | // Make a reference to a field in an interface. |
11219 | ||
11220 | Expression* | |
11221 | Expression::make_interface_field_reference(Expression* expr, | |
11222 | const std::string& field, | |
b13c66cd | 11223 | Location location) |
e440a328 | 11224 | { |
11225 | return new Interface_field_reference_expression(expr, field, location); | |
11226 | } | |
11227 | ||
11228 | // A general selector. This is a Parser_expression for LEFT.NAME. It | |
11229 | // is lowered after we know the type of the left hand side. | |
11230 | ||
11231 | class Selector_expression : public Parser_expression | |
11232 | { | |
11233 | public: | |
11234 | Selector_expression(Expression* left, const std::string& name, | |
b13c66cd | 11235 | Location location) |
e440a328 | 11236 | : Parser_expression(EXPRESSION_SELECTOR, location), |
11237 | left_(left), name_(name) | |
11238 | { } | |
11239 | ||
11240 | protected: | |
11241 | int | |
11242 | do_traverse(Traverse* traverse) | |
11243 | { return Expression::traverse(&this->left_, traverse); } | |
11244 | ||
11245 | Expression* | |
ceeb4318 | 11246 | do_lower(Gogo*, Named_object*, Statement_inserter*, int); |
e440a328 | 11247 | |
11248 | Expression* | |
11249 | do_copy() | |
11250 | { | |
11251 | return new Selector_expression(this->left_->copy(), this->name_, | |
11252 | this->location()); | |
11253 | } | |
11254 | ||
d751bb78 | 11255 | void |
11256 | do_dump_expression(Ast_dump_context* ast_dump_context) const; | |
11257 | ||
e440a328 | 11258 | private: |
11259 | Expression* | |
11260 | lower_method_expression(Gogo*); | |
11261 | ||
11262 | // The expression on the left hand side. | |
11263 | Expression* left_; | |
11264 | // The name on the right hand side. | |
11265 | std::string name_; | |
11266 | }; | |
11267 | ||
11268 | // Lower a selector expression once we know the real type of the left | |
11269 | // hand side. | |
11270 | ||
11271 | Expression* | |
ceeb4318 | 11272 | Selector_expression::do_lower(Gogo* gogo, Named_object*, Statement_inserter*, |
11273 | int) | |
e440a328 | 11274 | { |
11275 | Expression* left = this->left_; | |
11276 | if (left->is_type_expression()) | |
11277 | return this->lower_method_expression(gogo); | |
11278 | return Type::bind_field_or_method(gogo, left->type(), left, this->name_, | |
11279 | this->location()); | |
11280 | } | |
11281 | ||
11282 | // Lower a method expression T.M or (*T).M. We turn this into a | |
11283 | // function literal. | |
11284 | ||
11285 | Expression* | |
11286 | Selector_expression::lower_method_expression(Gogo* gogo) | |
11287 | { | |
b13c66cd | 11288 | Location location = this->location(); |
e440a328 | 11289 | Type* type = this->left_->type(); |
11290 | const std::string& name(this->name_); | |
11291 | ||
11292 | bool is_pointer; | |
11293 | if (type->points_to() == NULL) | |
11294 | is_pointer = false; | |
11295 | else | |
11296 | { | |
11297 | is_pointer = true; | |
11298 | type = type->points_to(); | |
11299 | } | |
11300 | Named_type* nt = type->named_type(); | |
11301 | if (nt == NULL) | |
11302 | { | |
11303 | error_at(location, | |
11304 | ("method expression requires named type or " | |
11305 | "pointer to named type")); | |
11306 | return Expression::make_error(location); | |
11307 | } | |
11308 | ||
11309 | bool is_ambiguous; | |
11310 | Method* method = nt->method_function(name, &is_ambiguous); | |
ab1468c3 | 11311 | const Typed_identifier* imethod = NULL; |
dcc8506b | 11312 | if (method == NULL && !is_pointer) |
ab1468c3 | 11313 | { |
11314 | Interface_type* it = nt->interface_type(); | |
11315 | if (it != NULL) | |
11316 | imethod = it->find_method(name); | |
11317 | } | |
11318 | ||
11319 | if (method == NULL && imethod == NULL) | |
e440a328 | 11320 | { |
11321 | if (!is_ambiguous) | |
dcc8506b | 11322 | error_at(location, "type %<%s%s%> has no method %<%s%>", |
11323 | is_pointer ? "*" : "", | |
e440a328 | 11324 | nt->message_name().c_str(), |
11325 | Gogo::message_name(name).c_str()); | |
11326 | else | |
dcc8506b | 11327 | error_at(location, "method %<%s%s%> is ambiguous in type %<%s%>", |
e440a328 | 11328 | Gogo::message_name(name).c_str(), |
dcc8506b | 11329 | is_pointer ? "*" : "", |
e440a328 | 11330 | nt->message_name().c_str()); |
11331 | return Expression::make_error(location); | |
11332 | } | |
11333 | ||
ab1468c3 | 11334 | if (method != NULL && !is_pointer && !method->is_value_method()) |
e440a328 | 11335 | { |
11336 | error_at(location, "method requires pointer (use %<(*%s).%s)%>", | |
11337 | nt->message_name().c_str(), | |
11338 | Gogo::message_name(name).c_str()); | |
11339 | return Expression::make_error(location); | |
11340 | } | |
11341 | ||
11342 | // Build a new function type in which the receiver becomes the first | |
11343 | // argument. | |
ab1468c3 | 11344 | Function_type* method_type; |
11345 | if (method != NULL) | |
11346 | { | |
11347 | method_type = method->type(); | |
c484d925 | 11348 | go_assert(method_type->is_method()); |
ab1468c3 | 11349 | } |
11350 | else | |
11351 | { | |
11352 | method_type = imethod->type()->function_type(); | |
c484d925 | 11353 | go_assert(method_type != NULL && !method_type->is_method()); |
ab1468c3 | 11354 | } |
e440a328 | 11355 | |
11356 | const char* const receiver_name = "$this"; | |
11357 | Typed_identifier_list* parameters = new Typed_identifier_list(); | |
11358 | parameters->push_back(Typed_identifier(receiver_name, this->left_->type(), | |
11359 | location)); | |
11360 | ||
11361 | const Typed_identifier_list* method_parameters = method_type->parameters(); | |
11362 | if (method_parameters != NULL) | |
11363 | { | |
f470da59 | 11364 | int i = 0; |
e440a328 | 11365 | for (Typed_identifier_list::const_iterator p = method_parameters->begin(); |
11366 | p != method_parameters->end(); | |
f470da59 | 11367 | ++p, ++i) |
11368 | { | |
68883531 | 11369 | if (!p->name().empty()) |
f470da59 | 11370 | parameters->push_back(*p); |
11371 | else | |
11372 | { | |
11373 | char buf[20]; | |
11374 | snprintf(buf, sizeof buf, "$param%d", i); | |
11375 | parameters->push_back(Typed_identifier(buf, p->type(), | |
11376 | p->location())); | |
11377 | } | |
11378 | } | |
e440a328 | 11379 | } |
11380 | ||
11381 | const Typed_identifier_list* method_results = method_type->results(); | |
11382 | Typed_identifier_list* results; | |
11383 | if (method_results == NULL) | |
11384 | results = NULL; | |
11385 | else | |
11386 | { | |
11387 | results = new Typed_identifier_list(); | |
11388 | for (Typed_identifier_list::const_iterator p = method_results->begin(); | |
11389 | p != method_results->end(); | |
11390 | ++p) | |
11391 | results->push_back(*p); | |
11392 | } | |
11393 | ||
11394 | Function_type* fntype = Type::make_function_type(NULL, parameters, results, | |
11395 | location); | |
11396 | if (method_type->is_varargs()) | |
11397 | fntype->set_is_varargs(); | |
11398 | ||
11399 | // We generate methods which always takes a pointer to the receiver | |
11400 | // as their first argument. If this is for a pointer type, we can | |
11401 | // simply reuse the existing function. We use an internal hack to | |
11402 | // get the right type. | |
8381eda7 | 11403 | // FIXME: This optimization is disabled because it doesn't yet work |
11404 | // with function descriptors when the method expression is not | |
11405 | // directly called. | |
11406 | if (method != NULL && is_pointer && false) | |
e440a328 | 11407 | { |
11408 | Named_object* mno = (method->needs_stub_method() | |
11409 | ? method->stub_object() | |
11410 | : method->named_object()); | |
11411 | Expression* f = Expression::make_func_reference(mno, NULL, location); | |
11412 | f = Expression::make_cast(fntype, f, location); | |
11413 | Type_conversion_expression* tce = | |
11414 | static_cast<Type_conversion_expression*>(f); | |
11415 | tce->set_may_convert_function_types(); | |
11416 | return f; | |
11417 | } | |
11418 | ||
11419 | Named_object* no = gogo->start_function(Gogo::thunk_name(), fntype, false, | |
11420 | location); | |
11421 | ||
11422 | Named_object* vno = gogo->lookup(receiver_name, NULL); | |
c484d925 | 11423 | go_assert(vno != NULL); |
e440a328 | 11424 | Expression* ve = Expression::make_var_reference(vno, location); |
ab1468c3 | 11425 | Expression* bm; |
11426 | if (method != NULL) | |
11427 | bm = Type::bind_field_or_method(gogo, nt, ve, name, location); | |
11428 | else | |
11429 | bm = Expression::make_interface_field_reference(ve, name, location); | |
f690b0bb | 11430 | |
11431 | // Even though we found the method above, if it has an error type we | |
11432 | // may see an error here. | |
11433 | if (bm->is_error_expression()) | |
463fe805 | 11434 | { |
11435 | gogo->finish_function(location); | |
11436 | return bm; | |
11437 | } | |
e440a328 | 11438 | |
11439 | Expression_list* args; | |
f470da59 | 11440 | if (parameters->size() <= 1) |
e440a328 | 11441 | args = NULL; |
11442 | else | |
11443 | { | |
11444 | args = new Expression_list(); | |
f470da59 | 11445 | Typed_identifier_list::const_iterator p = parameters->begin(); |
11446 | ++p; | |
11447 | for (; p != parameters->end(); ++p) | |
e440a328 | 11448 | { |
11449 | vno = gogo->lookup(p->name(), NULL); | |
c484d925 | 11450 | go_assert(vno != NULL); |
e440a328 | 11451 | args->push_back(Expression::make_var_reference(vno, location)); |
11452 | } | |
11453 | } | |
11454 | ||
ceeb4318 | 11455 | gogo->start_block(location); |
11456 | ||
e440a328 | 11457 | Call_expression* call = Expression::make_call(bm, args, |
11458 | method_type->is_varargs(), | |
11459 | location); | |
11460 | ||
0afbb937 | 11461 | Statement* s = Statement::make_return_from_call(call, location); |
e440a328 | 11462 | gogo->add_statement(s); |
11463 | ||
ceeb4318 | 11464 | Block* b = gogo->finish_block(location); |
11465 | ||
11466 | gogo->add_block(b, location); | |
11467 | ||
11468 | // Lower the call in case there are multiple results. | |
11469 | gogo->lower_block(no, b); | |
a32698ee | 11470 | gogo->flatten_block(no, b); |
ceeb4318 | 11471 | |
e440a328 | 11472 | gogo->finish_function(location); |
11473 | ||
11474 | return Expression::make_func_reference(no, NULL, location); | |
11475 | } | |
11476 | ||
d751bb78 | 11477 | // Dump the ast for a selector expression. |
11478 | ||
11479 | void | |
11480 | Selector_expression::do_dump_expression(Ast_dump_context* ast_dump_context) | |
11481 | const | |
11482 | { | |
11483 | ast_dump_context->dump_expression(this->left_); | |
11484 | ast_dump_context->ostream() << "."; | |
11485 | ast_dump_context->ostream() << this->name_; | |
11486 | } | |
11487 | ||
e440a328 | 11488 | // Make a selector expression. |
11489 | ||
11490 | Expression* | |
11491 | Expression::make_selector(Expression* left, const std::string& name, | |
b13c66cd | 11492 | Location location) |
e440a328 | 11493 | { |
11494 | return new Selector_expression(left, name, location); | |
11495 | } | |
11496 | ||
11497 | // Implement the builtin function new. | |
11498 | ||
11499 | class Allocation_expression : public Expression | |
11500 | { | |
11501 | public: | |
b13c66cd | 11502 | Allocation_expression(Type* type, Location location) |
e440a328 | 11503 | : Expression(EXPRESSION_ALLOCATION, location), |
11504 | type_(type) | |
11505 | { } | |
11506 | ||
11507 | protected: | |
11508 | int | |
11509 | do_traverse(Traverse* traverse) | |
11510 | { return Type::traverse(this->type_, traverse); } | |
11511 | ||
11512 | Type* | |
11513 | do_type() | |
11514 | { return Type::make_pointer_type(this->type_); } | |
11515 | ||
11516 | void | |
11517 | do_determine_type(const Type_context*) | |
11518 | { } | |
11519 | ||
e440a328 | 11520 | Expression* |
11521 | do_copy() | |
11522 | { return new Allocation_expression(this->type_, this->location()); } | |
11523 | ||
ea664253 | 11524 | Bexpression* |
11525 | do_get_backend(Translate_context*); | |
e440a328 | 11526 | |
d751bb78 | 11527 | void |
11528 | do_dump_expression(Ast_dump_context*) const; | |
11529 | ||
e440a328 | 11530 | private: |
11531 | // The type we are allocating. | |
11532 | Type* type_; | |
11533 | }; | |
11534 | ||
ea664253 | 11535 | // Return the backend representation for an allocation expression. |
e440a328 | 11536 | |
ea664253 | 11537 | Bexpression* |
11538 | Allocation_expression::do_get_backend(Translate_context* context) | |
e440a328 | 11539 | { |
2c809f8f | 11540 | Gogo* gogo = context->gogo(); |
11541 | Location loc = this->location(); | |
ea664253 | 11542 | Bexpression* space = |
11543 | gogo->allocate_memory(this->type_, loc)->get_backend(context); | |
2c809f8f | 11544 | Btype* pbtype = gogo->backend()->pointer_type(this->type_->get_backend(gogo)); |
ea664253 | 11545 | return gogo->backend()->convert_expression(pbtype, space, loc); |
e440a328 | 11546 | } |
11547 | ||
d751bb78 | 11548 | // Dump ast representation for an allocation expression. |
11549 | ||
11550 | void | |
11551 | Allocation_expression::do_dump_expression(Ast_dump_context* ast_dump_context) | |
11552 | const | |
11553 | { | |
11554 | ast_dump_context->ostream() << "new("; | |
11555 | ast_dump_context->dump_type(this->type_); | |
11556 | ast_dump_context->ostream() << ")"; | |
11557 | } | |
11558 | ||
e440a328 | 11559 | // Make an allocation expression. |
11560 | ||
11561 | Expression* | |
b13c66cd | 11562 | Expression::make_allocation(Type* type, Location location) |
e440a328 | 11563 | { |
11564 | return new Allocation_expression(type, location); | |
11565 | } | |
11566 | ||
e440a328 | 11567 | // Construct a struct. |
11568 | ||
11569 | class Struct_construction_expression : public Expression | |
11570 | { | |
11571 | public: | |
11572 | Struct_construction_expression(Type* type, Expression_list* vals, | |
b13c66cd | 11573 | Location location) |
e440a328 | 11574 | : Expression(EXPRESSION_STRUCT_CONSTRUCTION, location), |
0c4f5a19 | 11575 | type_(type), vals_(vals), traverse_order_(NULL) |
e440a328 | 11576 | { } |
11577 | ||
0c4f5a19 | 11578 | // Set the traversal order, used to ensure that we implement the |
11579 | // order of evaluation rules. Takes ownership of the argument. | |
11580 | void | |
11581 | set_traverse_order(std::vector<int>* traverse_order) | |
11582 | { this->traverse_order_ = traverse_order; } | |
11583 | ||
e440a328 | 11584 | // Return whether this is a constant initializer. |
11585 | bool | |
11586 | is_constant_struct() const; | |
11587 | ||
11588 | protected: | |
11589 | int | |
11590 | do_traverse(Traverse* traverse); | |
11591 | ||
f9ca30f9 | 11592 | bool |
11593 | do_is_immutable() const; | |
11594 | ||
e440a328 | 11595 | Type* |
11596 | do_type() | |
11597 | { return this->type_; } | |
11598 | ||
11599 | void | |
11600 | do_determine_type(const Type_context*); | |
11601 | ||
11602 | void | |
11603 | do_check_types(Gogo*); | |
11604 | ||
11605 | Expression* | |
11606 | do_copy() | |
11607 | { | |
0c4f5a19 | 11608 | Struct_construction_expression* ret = |
0f87b2f8 | 11609 | new Struct_construction_expression(this->type_, |
11610 | (this->vals_ == NULL | |
11611 | ? NULL | |
11612 | : this->vals_->copy()), | |
0c4f5a19 | 11613 | this->location()); |
11614 | if (this->traverse_order_ != NULL) | |
11615 | ret->set_traverse_order(this->traverse_order_); | |
11616 | return ret; | |
e440a328 | 11617 | } |
11618 | ||
8ba8cc87 | 11619 | Expression* |
11620 | do_flatten(Gogo*, Named_object*, Statement_inserter*); | |
11621 | ||
ea664253 | 11622 | Bexpression* |
11623 | do_get_backend(Translate_context*); | |
e440a328 | 11624 | |
11625 | void | |
11626 | do_export(Export*) const; | |
11627 | ||
d751bb78 | 11628 | void |
11629 | do_dump_expression(Ast_dump_context*) const; | |
11630 | ||
e440a328 | 11631 | private: |
11632 | // The type of the struct to construct. | |
11633 | Type* type_; | |
11634 | // The list of values, in order of the fields in the struct. A NULL | |
11635 | // entry means that the field should be zero-initialized. | |
11636 | Expression_list* vals_; | |
0c4f5a19 | 11637 | // If not NULL, the order in which to traverse vals_. This is used |
11638 | // so that we implement the order of evaluation rules correctly. | |
11639 | std::vector<int>* traverse_order_; | |
e440a328 | 11640 | }; |
11641 | ||
11642 | // Traversal. | |
11643 | ||
11644 | int | |
11645 | Struct_construction_expression::do_traverse(Traverse* traverse) | |
11646 | { | |
0c4f5a19 | 11647 | if (this->vals_ != NULL) |
11648 | { | |
11649 | if (this->traverse_order_ == NULL) | |
11650 | { | |
11651 | if (this->vals_->traverse(traverse) == TRAVERSE_EXIT) | |
11652 | return TRAVERSE_EXIT; | |
11653 | } | |
11654 | else | |
11655 | { | |
11656 | for (std::vector<int>::const_iterator p = | |
11657 | this->traverse_order_->begin(); | |
11658 | p != this->traverse_order_->end(); | |
11659 | ++p) | |
11660 | { | |
11661 | if (Expression::traverse(&this->vals_->at(*p), traverse) | |
11662 | == TRAVERSE_EXIT) | |
11663 | return TRAVERSE_EXIT; | |
11664 | } | |
11665 | } | |
11666 | } | |
e440a328 | 11667 | if (Type::traverse(this->type_, traverse) == TRAVERSE_EXIT) |
11668 | return TRAVERSE_EXIT; | |
11669 | return TRAVERSE_CONTINUE; | |
11670 | } | |
11671 | ||
11672 | // Return whether this is a constant initializer. | |
11673 | ||
11674 | bool | |
11675 | Struct_construction_expression::is_constant_struct() const | |
11676 | { | |
11677 | if (this->vals_ == NULL) | |
11678 | return true; | |
11679 | for (Expression_list::const_iterator pv = this->vals_->begin(); | |
11680 | pv != this->vals_->end(); | |
11681 | ++pv) | |
11682 | { | |
11683 | if (*pv != NULL | |
11684 | && !(*pv)->is_constant() | |
11685 | && (!(*pv)->is_composite_literal() | |
11686 | || (*pv)->is_nonconstant_composite_literal())) | |
11687 | return false; | |
11688 | } | |
11689 | ||
11690 | const Struct_field_list* fields = this->type_->struct_type()->fields(); | |
11691 | for (Struct_field_list::const_iterator pf = fields->begin(); | |
11692 | pf != fields->end(); | |
11693 | ++pf) | |
11694 | { | |
11695 | // There are no constant constructors for interfaces. | |
11696 | if (pf->type()->interface_type() != NULL) | |
11697 | return false; | |
11698 | } | |
11699 | ||
11700 | return true; | |
11701 | } | |
11702 | ||
f9ca30f9 | 11703 | // Return whether this struct is immutable. |
11704 | ||
11705 | bool | |
11706 | Struct_construction_expression::do_is_immutable() const | |
11707 | { | |
11708 | if (this->vals_ == NULL) | |
11709 | return true; | |
11710 | for (Expression_list::const_iterator pv = this->vals_->begin(); | |
11711 | pv != this->vals_->end(); | |
11712 | ++pv) | |
11713 | { | |
11714 | if (*pv != NULL && !(*pv)->is_immutable()) | |
11715 | return false; | |
11716 | } | |
11717 | return true; | |
11718 | } | |
11719 | ||
e440a328 | 11720 | // Final type determination. |
11721 | ||
11722 | void | |
11723 | Struct_construction_expression::do_determine_type(const Type_context*) | |
11724 | { | |
11725 | if (this->vals_ == NULL) | |
11726 | return; | |
11727 | const Struct_field_list* fields = this->type_->struct_type()->fields(); | |
11728 | Expression_list::const_iterator pv = this->vals_->begin(); | |
11729 | for (Struct_field_list::const_iterator pf = fields->begin(); | |
11730 | pf != fields->end(); | |
11731 | ++pf, ++pv) | |
11732 | { | |
11733 | if (pv == this->vals_->end()) | |
11734 | return; | |
11735 | if (*pv != NULL) | |
11736 | { | |
11737 | Type_context subcontext(pf->type(), false); | |
11738 | (*pv)->determine_type(&subcontext); | |
11739 | } | |
11740 | } | |
a6cb4c0e | 11741 | // Extra values are an error we will report elsewhere; we still want |
11742 | // to determine the type to avoid knockon errors. | |
11743 | for (; pv != this->vals_->end(); ++pv) | |
11744 | (*pv)->determine_type_no_context(); | |
e440a328 | 11745 | } |
11746 | ||
11747 | // Check types. | |
11748 | ||
11749 | void | |
11750 | Struct_construction_expression::do_check_types(Gogo*) | |
11751 | { | |
11752 | if (this->vals_ == NULL) | |
11753 | return; | |
11754 | ||
11755 | Struct_type* st = this->type_->struct_type(); | |
11756 | if (this->vals_->size() > st->field_count()) | |
11757 | { | |
11758 | this->report_error(_("too many expressions for struct")); | |
11759 | return; | |
11760 | } | |
11761 | ||
11762 | const Struct_field_list* fields = st->fields(); | |
11763 | Expression_list::const_iterator pv = this->vals_->begin(); | |
11764 | int i = 0; | |
11765 | for (Struct_field_list::const_iterator pf = fields->begin(); | |
11766 | pf != fields->end(); | |
11767 | ++pf, ++pv, ++i) | |
11768 | { | |
11769 | if (pv == this->vals_->end()) | |
11770 | { | |
11771 | this->report_error(_("too few expressions for struct")); | |
11772 | break; | |
11773 | } | |
11774 | ||
11775 | if (*pv == NULL) | |
11776 | continue; | |
11777 | ||
11778 | std::string reason; | |
11779 | if (!Type::are_assignable(pf->type(), (*pv)->type(), &reason)) | |
11780 | { | |
11781 | if (reason.empty()) | |
11782 | error_at((*pv)->location(), | |
11783 | "incompatible type for field %d in struct construction", | |
11784 | i + 1); | |
11785 | else | |
11786 | error_at((*pv)->location(), | |
11787 | ("incompatible type for field %d in " | |
11788 | "struct construction (%s)"), | |
11789 | i + 1, reason.c_str()); | |
11790 | this->set_is_error(); | |
11791 | } | |
11792 | } | |
c484d925 | 11793 | go_assert(pv == this->vals_->end()); |
e440a328 | 11794 | } |
11795 | ||
8ba8cc87 | 11796 | // Flatten a struct construction expression. Store the values into |
11797 | // temporaries in case they need interface conversion. | |
11798 | ||
11799 | Expression* | |
11800 | Struct_construction_expression::do_flatten(Gogo*, Named_object*, | |
11801 | Statement_inserter* inserter) | |
11802 | { | |
11803 | if (this->vals_ == NULL) | |
11804 | return this; | |
11805 | ||
11806 | // If this is a constant struct, we don't need temporaries. | |
11807 | if (this->is_constant_struct()) | |
11808 | return this; | |
11809 | ||
11810 | Location loc = this->location(); | |
11811 | for (Expression_list::iterator pv = this->vals_->begin(); | |
11812 | pv != this->vals_->end(); | |
11813 | ++pv) | |
11814 | { | |
11815 | if (*pv != NULL) | |
11816 | { | |
11817 | if (!(*pv)->is_variable()) | |
11818 | { | |
11819 | Temporary_statement* temp = | |
11820 | Statement::make_temporary(NULL, *pv, loc); | |
11821 | inserter->insert(temp); | |
11822 | *pv = Expression::make_temporary_reference(temp, loc); | |
11823 | } | |
11824 | } | |
11825 | } | |
11826 | return this; | |
11827 | } | |
11828 | ||
ea664253 | 11829 | // Return the backend representation for constructing a struct. |
e440a328 | 11830 | |
ea664253 | 11831 | Bexpression* |
11832 | Struct_construction_expression::do_get_backend(Translate_context* context) | |
e440a328 | 11833 | { |
11834 | Gogo* gogo = context->gogo(); | |
11835 | ||
2c809f8f | 11836 | Btype* btype = this->type_->get_backend(gogo); |
e440a328 | 11837 | if (this->vals_ == NULL) |
ea664253 | 11838 | return gogo->backend()->zero_expression(btype); |
e440a328 | 11839 | |
e440a328 | 11840 | const Struct_field_list* fields = this->type_->struct_type()->fields(); |
e440a328 | 11841 | Expression_list::const_iterator pv = this->vals_->begin(); |
2c809f8f | 11842 | std::vector<Bexpression*> init; |
11843 | for (Struct_field_list::const_iterator pf = fields->begin(); | |
11844 | pf != fields->end(); | |
11845 | ++pf) | |
e440a328 | 11846 | { |
63697958 | 11847 | Btype* fbtype = pf->type()->get_backend(gogo); |
e440a328 | 11848 | if (pv == this->vals_->end()) |
2c809f8f | 11849 | init.push_back(gogo->backend()->zero_expression(fbtype)); |
e440a328 | 11850 | else if (*pv == NULL) |
11851 | { | |
2c809f8f | 11852 | init.push_back(gogo->backend()->zero_expression(fbtype)); |
e440a328 | 11853 | ++pv; |
11854 | } | |
11855 | else | |
11856 | { | |
2c809f8f | 11857 | Expression* val = |
11858 | Expression::convert_for_assignment(gogo, pf->type(), | |
11859 | *pv, this->location()); | |
ea664253 | 11860 | init.push_back(val->get_backend(context)); |
e440a328 | 11861 | ++pv; |
11862 | } | |
e440a328 | 11863 | } |
ea664253 | 11864 | return gogo->backend()->constructor_expression(btype, init, this->location()); |
e440a328 | 11865 | } |
11866 | ||
11867 | // Export a struct construction. | |
11868 | ||
11869 | void | |
11870 | Struct_construction_expression::do_export(Export* exp) const | |
11871 | { | |
11872 | exp->write_c_string("convert("); | |
11873 | exp->write_type(this->type_); | |
11874 | for (Expression_list::const_iterator pv = this->vals_->begin(); | |
11875 | pv != this->vals_->end(); | |
11876 | ++pv) | |
11877 | { | |
11878 | exp->write_c_string(", "); | |
11879 | if (*pv != NULL) | |
11880 | (*pv)->export_expression(exp); | |
11881 | } | |
11882 | exp->write_c_string(")"); | |
11883 | } | |
11884 | ||
d751bb78 | 11885 | // Dump ast representation of a struct construction expression. |
11886 | ||
11887 | void | |
11888 | Struct_construction_expression::do_dump_expression( | |
11889 | Ast_dump_context* ast_dump_context) const | |
11890 | { | |
d751bb78 | 11891 | ast_dump_context->dump_type(this->type_); |
11892 | ast_dump_context->ostream() << "{"; | |
11893 | ast_dump_context->dump_expression_list(this->vals_); | |
11894 | ast_dump_context->ostream() << "}"; | |
11895 | } | |
11896 | ||
e440a328 | 11897 | // Make a struct composite literal. This used by the thunk code. |
11898 | ||
11899 | Expression* | |
11900 | Expression::make_struct_composite_literal(Type* type, Expression_list* vals, | |
b13c66cd | 11901 | Location location) |
e440a328 | 11902 | { |
c484d925 | 11903 | go_assert(type->struct_type() != NULL); |
e440a328 | 11904 | return new Struct_construction_expression(type, vals, location); |
11905 | } | |
11906 | ||
11907 | // Construct an array. This class is not used directly; instead we | |
11908 | // use the child classes, Fixed_array_construction_expression and | |
2c809f8f | 11909 | // Slice_construction_expression. |
e440a328 | 11910 | |
11911 | class Array_construction_expression : public Expression | |
11912 | { | |
11913 | protected: | |
11914 | Array_construction_expression(Expression_classification classification, | |
ffe743ca | 11915 | Type* type, |
11916 | const std::vector<unsigned long>* indexes, | |
11917 | Expression_list* vals, Location location) | |
e440a328 | 11918 | : Expression(classification, location), |
ffe743ca | 11919 | type_(type), indexes_(indexes), vals_(vals) |
11920 | { go_assert(indexes == NULL || indexes->size() == vals->size()); } | |
e440a328 | 11921 | |
11922 | public: | |
11923 | // Return whether this is a constant initializer. | |
11924 | bool | |
11925 | is_constant_array() const; | |
11926 | ||
11927 | // Return the number of elements. | |
11928 | size_t | |
11929 | element_count() const | |
11930 | { return this->vals_ == NULL ? 0 : this->vals_->size(); } | |
11931 | ||
11932 | protected: | |
23d77f91 | 11933 | virtual int |
e440a328 | 11934 | do_traverse(Traverse* traverse); |
11935 | ||
f9ca30f9 | 11936 | bool |
11937 | do_is_immutable() const; | |
11938 | ||
e440a328 | 11939 | Type* |
11940 | do_type() | |
11941 | { return this->type_; } | |
11942 | ||
11943 | void | |
11944 | do_determine_type(const Type_context*); | |
11945 | ||
11946 | void | |
11947 | do_check_types(Gogo*); | |
11948 | ||
e440a328 | 11949 | void |
11950 | do_export(Export*) const; | |
11951 | ||
ffe743ca | 11952 | // The indexes. |
11953 | const std::vector<unsigned long>* | |
11954 | indexes() | |
11955 | { return this->indexes_; } | |
11956 | ||
e440a328 | 11957 | // The list of values. |
11958 | Expression_list* | |
11959 | vals() | |
11960 | { return this->vals_; } | |
11961 | ||
8ba8cc87 | 11962 | Expression* |
11963 | do_flatten(Gogo*, Named_object*, Statement_inserter*); | |
11964 | ||
2c809f8f | 11965 | // Get the backend constructor for the array values. |
11966 | Bexpression* | |
11967 | get_constructor(Translate_context* context, Btype* btype); | |
e440a328 | 11968 | |
d751bb78 | 11969 | void |
11970 | do_dump_expression(Ast_dump_context*) const; | |
11971 | ||
e440a328 | 11972 | private: |
11973 | // The type of the array to construct. | |
11974 | Type* type_; | |
ffe743ca | 11975 | // The list of indexes into the array, one for each value. This may |
11976 | // be NULL, in which case the indexes start at zero and increment. | |
11977 | const std::vector<unsigned long>* indexes_; | |
11978 | // The list of values. This may be NULL if there are no values. | |
e440a328 | 11979 | Expression_list* vals_; |
11980 | }; | |
11981 | ||
11982 | // Traversal. | |
11983 | ||
11984 | int | |
11985 | Array_construction_expression::do_traverse(Traverse* traverse) | |
11986 | { | |
11987 | if (this->vals_ != NULL | |
11988 | && this->vals_->traverse(traverse) == TRAVERSE_EXIT) | |
11989 | return TRAVERSE_EXIT; | |
11990 | if (Type::traverse(this->type_, traverse) == TRAVERSE_EXIT) | |
11991 | return TRAVERSE_EXIT; | |
11992 | return TRAVERSE_CONTINUE; | |
11993 | } | |
11994 | ||
11995 | // Return whether this is a constant initializer. | |
11996 | ||
11997 | bool | |
11998 | Array_construction_expression::is_constant_array() const | |
11999 | { | |
12000 | if (this->vals_ == NULL) | |
12001 | return true; | |
12002 | ||
12003 | // There are no constant constructors for interfaces. | |
12004 | if (this->type_->array_type()->element_type()->interface_type() != NULL) | |
12005 | return false; | |
12006 | ||
12007 | for (Expression_list::const_iterator pv = this->vals_->begin(); | |
12008 | pv != this->vals_->end(); | |
12009 | ++pv) | |
12010 | { | |
12011 | if (*pv != NULL | |
12012 | && !(*pv)->is_constant() | |
12013 | && (!(*pv)->is_composite_literal() | |
12014 | || (*pv)->is_nonconstant_composite_literal())) | |
12015 | return false; | |
12016 | } | |
12017 | return true; | |
12018 | } | |
12019 | ||
f9ca30f9 | 12020 | // Return whether this is an immutable array initializer. |
12021 | ||
12022 | bool | |
12023 | Array_construction_expression::do_is_immutable() const | |
12024 | { | |
12025 | if (this->vals_ == NULL) | |
12026 | return true; | |
12027 | for (Expression_list::const_iterator pv = this->vals_->begin(); | |
12028 | pv != this->vals_->end(); | |
12029 | ++pv) | |
12030 | { | |
12031 | if (*pv != NULL && !(*pv)->is_immutable()) | |
12032 | return false; | |
12033 | } | |
12034 | return true; | |
12035 | } | |
12036 | ||
e440a328 | 12037 | // Final type determination. |
12038 | ||
12039 | void | |
12040 | Array_construction_expression::do_determine_type(const Type_context*) | |
12041 | { | |
12042 | if (this->vals_ == NULL) | |
12043 | return; | |
12044 | Type_context subcontext(this->type_->array_type()->element_type(), false); | |
12045 | for (Expression_list::const_iterator pv = this->vals_->begin(); | |
12046 | pv != this->vals_->end(); | |
12047 | ++pv) | |
12048 | { | |
12049 | if (*pv != NULL) | |
12050 | (*pv)->determine_type(&subcontext); | |
12051 | } | |
12052 | } | |
12053 | ||
12054 | // Check types. | |
12055 | ||
12056 | void | |
12057 | Array_construction_expression::do_check_types(Gogo*) | |
12058 | { | |
12059 | if (this->vals_ == NULL) | |
12060 | return; | |
12061 | ||
12062 | Array_type* at = this->type_->array_type(); | |
12063 | int i = 0; | |
12064 | Type* element_type = at->element_type(); | |
12065 | for (Expression_list::const_iterator pv = this->vals_->begin(); | |
12066 | pv != this->vals_->end(); | |
12067 | ++pv, ++i) | |
12068 | { | |
12069 | if (*pv != NULL | |
12070 | && !Type::are_assignable(element_type, (*pv)->type(), NULL)) | |
12071 | { | |
12072 | error_at((*pv)->location(), | |
12073 | "incompatible type for element %d in composite literal", | |
12074 | i + 1); | |
12075 | this->set_is_error(); | |
12076 | } | |
12077 | } | |
e440a328 | 12078 | } |
12079 | ||
8ba8cc87 | 12080 | // Flatten an array construction expression. Store the values into |
12081 | // temporaries in case they need interface conversion. | |
12082 | ||
12083 | Expression* | |
12084 | Array_construction_expression::do_flatten(Gogo*, Named_object*, | |
12085 | Statement_inserter* inserter) | |
12086 | { | |
12087 | if (this->vals_ == NULL) | |
12088 | return this; | |
12089 | ||
12090 | // If this is a constant array, we don't need temporaries. | |
12091 | if (this->is_constant_array()) | |
12092 | return this; | |
12093 | ||
12094 | Location loc = this->location(); | |
12095 | for (Expression_list::iterator pv = this->vals_->begin(); | |
12096 | pv != this->vals_->end(); | |
12097 | ++pv) | |
12098 | { | |
12099 | if (*pv != NULL) | |
12100 | { | |
12101 | if (!(*pv)->is_variable()) | |
12102 | { | |
12103 | Temporary_statement* temp = | |
12104 | Statement::make_temporary(NULL, *pv, loc); | |
12105 | inserter->insert(temp); | |
12106 | *pv = Expression::make_temporary_reference(temp, loc); | |
12107 | } | |
12108 | } | |
12109 | } | |
12110 | return this; | |
12111 | } | |
12112 | ||
2c809f8f | 12113 | // Get a constructor expression for the array values. |
e440a328 | 12114 | |
2c809f8f | 12115 | Bexpression* |
12116 | Array_construction_expression::get_constructor(Translate_context* context, | |
12117 | Btype* array_btype) | |
e440a328 | 12118 | { |
e440a328 | 12119 | Type* element_type = this->type_->array_type()->element_type(); |
2c809f8f | 12120 | |
12121 | std::vector<unsigned long> indexes; | |
12122 | std::vector<Bexpression*> vals; | |
12123 | Gogo* gogo = context->gogo(); | |
e440a328 | 12124 | if (this->vals_ != NULL) |
12125 | { | |
12126 | size_t i = 0; | |
ffe743ca | 12127 | std::vector<unsigned long>::const_iterator pi; |
12128 | if (this->indexes_ != NULL) | |
12129 | pi = this->indexes_->begin(); | |
e440a328 | 12130 | for (Expression_list::const_iterator pv = this->vals_->begin(); |
12131 | pv != this->vals_->end(); | |
12132 | ++pv, ++i) | |
12133 | { | |
ffe743ca | 12134 | if (this->indexes_ != NULL) |
12135 | go_assert(pi != this->indexes_->end()); | |
ffe743ca | 12136 | |
12137 | if (this->indexes_ == NULL) | |
2c809f8f | 12138 | indexes.push_back(i); |
ffe743ca | 12139 | else |
2c809f8f | 12140 | indexes.push_back(*pi); |
e440a328 | 12141 | if (*pv == NULL) |
63697958 | 12142 | { |
63697958 | 12143 | Btype* ebtype = element_type->get_backend(gogo); |
12144 | Bexpression *zv = gogo->backend()->zero_expression(ebtype); | |
2c809f8f | 12145 | vals.push_back(zv); |
63697958 | 12146 | } |
e440a328 | 12147 | else |
12148 | { | |
2c809f8f | 12149 | Expression* val_expr = |
12150 | Expression::convert_for_assignment(gogo, element_type, *pv, | |
12151 | this->location()); | |
ea664253 | 12152 | vals.push_back(val_expr->get_backend(context)); |
e440a328 | 12153 | } |
ffe743ca | 12154 | if (this->indexes_ != NULL) |
12155 | ++pi; | |
e440a328 | 12156 | } |
ffe743ca | 12157 | if (this->indexes_ != NULL) |
12158 | go_assert(pi == this->indexes_->end()); | |
e440a328 | 12159 | } |
2c809f8f | 12160 | return gogo->backend()->array_constructor_expression(array_btype, indexes, |
12161 | vals, this->location()); | |
e440a328 | 12162 | } |
12163 | ||
12164 | // Export an array construction. | |
12165 | ||
12166 | void | |
12167 | Array_construction_expression::do_export(Export* exp) const | |
12168 | { | |
12169 | exp->write_c_string("convert("); | |
12170 | exp->write_type(this->type_); | |
12171 | if (this->vals_ != NULL) | |
12172 | { | |
ffe743ca | 12173 | std::vector<unsigned long>::const_iterator pi; |
12174 | if (this->indexes_ != NULL) | |
12175 | pi = this->indexes_->begin(); | |
e440a328 | 12176 | for (Expression_list::const_iterator pv = this->vals_->begin(); |
12177 | pv != this->vals_->end(); | |
12178 | ++pv) | |
12179 | { | |
12180 | exp->write_c_string(", "); | |
ffe743ca | 12181 | |
12182 | if (this->indexes_ != NULL) | |
12183 | { | |
12184 | char buf[100]; | |
12185 | snprintf(buf, sizeof buf, "%lu", *pi); | |
12186 | exp->write_c_string(buf); | |
12187 | exp->write_c_string(":"); | |
12188 | } | |
12189 | ||
e440a328 | 12190 | if (*pv != NULL) |
12191 | (*pv)->export_expression(exp); | |
ffe743ca | 12192 | |
12193 | if (this->indexes_ != NULL) | |
12194 | ++pi; | |
e440a328 | 12195 | } |
12196 | } | |
12197 | exp->write_c_string(")"); | |
12198 | } | |
12199 | ||
d751bb78 | 12200 | // Dump ast representation of an array construction expressin. |
12201 | ||
12202 | void | |
12203 | Array_construction_expression::do_dump_expression( | |
12204 | Ast_dump_context* ast_dump_context) const | |
12205 | { | |
ffe743ca | 12206 | Expression* length = this->type_->array_type()->length(); |
8b1c301d | 12207 | |
12208 | ast_dump_context->ostream() << "[" ; | |
12209 | if (length != NULL) | |
12210 | { | |
12211 | ast_dump_context->dump_expression(length); | |
12212 | } | |
12213 | ast_dump_context->ostream() << "]" ; | |
d751bb78 | 12214 | ast_dump_context->dump_type(this->type_); |
12215 | ast_dump_context->ostream() << "{" ; | |
ffe743ca | 12216 | if (this->indexes_ == NULL) |
12217 | ast_dump_context->dump_expression_list(this->vals_); | |
12218 | else | |
12219 | { | |
12220 | Expression_list::const_iterator pv = this->vals_->begin(); | |
12221 | for (std::vector<unsigned long>::const_iterator pi = | |
12222 | this->indexes_->begin(); | |
12223 | pi != this->indexes_->end(); | |
12224 | ++pi, ++pv) | |
12225 | { | |
12226 | if (pi != this->indexes_->begin()) | |
12227 | ast_dump_context->ostream() << ", "; | |
12228 | ast_dump_context->ostream() << *pi << ':'; | |
12229 | ast_dump_context->dump_expression(*pv); | |
12230 | } | |
12231 | } | |
d751bb78 | 12232 | ast_dump_context->ostream() << "}" ; |
12233 | ||
12234 | } | |
12235 | ||
e440a328 | 12236 | // Construct a fixed array. |
12237 | ||
12238 | class Fixed_array_construction_expression : | |
12239 | public Array_construction_expression | |
12240 | { | |
12241 | public: | |
ffe743ca | 12242 | Fixed_array_construction_expression(Type* type, |
12243 | const std::vector<unsigned long>* indexes, | |
12244 | Expression_list* vals, Location location) | |
e440a328 | 12245 | : Array_construction_expression(EXPRESSION_FIXED_ARRAY_CONSTRUCTION, |
ffe743ca | 12246 | type, indexes, vals, location) |
12247 | { go_assert(type->array_type() != NULL && !type->is_slice_type()); } | |
e440a328 | 12248 | |
12249 | protected: | |
12250 | Expression* | |
12251 | do_copy() | |
12252 | { | |
12253 | return new Fixed_array_construction_expression(this->type(), | |
ffe743ca | 12254 | this->indexes(), |
e440a328 | 12255 | (this->vals() == NULL |
12256 | ? NULL | |
12257 | : this->vals()->copy()), | |
12258 | this->location()); | |
12259 | } | |
12260 | ||
ea664253 | 12261 | Bexpression* |
12262 | do_get_backend(Translate_context*); | |
e440a328 | 12263 | }; |
12264 | ||
ea664253 | 12265 | // Return the backend representation for constructing a fixed array. |
e440a328 | 12266 | |
ea664253 | 12267 | Bexpression* |
12268 | Fixed_array_construction_expression::do_get_backend(Translate_context* context) | |
e440a328 | 12269 | { |
9f0e0513 | 12270 | Type* type = this->type(); |
12271 | Btype* btype = type->get_backend(context->gogo()); | |
ea664253 | 12272 | return this->get_constructor(context, btype); |
e440a328 | 12273 | } |
12274 | ||
76f85fd6 | 12275 | Expression* |
12276 | Expression::make_array_composite_literal(Type* type, Expression_list* vals, | |
12277 | Location location) | |
12278 | { | |
12279 | go_assert(type->array_type() != NULL && !type->is_slice_type()); | |
12280 | return new Fixed_array_construction_expression(type, NULL, vals, location); | |
12281 | } | |
12282 | ||
2c809f8f | 12283 | // Construct a slice. |
e440a328 | 12284 | |
2c809f8f | 12285 | class Slice_construction_expression : public Array_construction_expression |
e440a328 | 12286 | { |
12287 | public: | |
2c809f8f | 12288 | Slice_construction_expression(Type* type, |
12289 | const std::vector<unsigned long>* indexes, | |
12290 | Expression_list* vals, Location location) | |
12291 | : Array_construction_expression(EXPRESSION_SLICE_CONSTRUCTION, | |
12292 | type, indexes, vals, location), | |
12293 | valtype_(NULL) | |
23d77f91 | 12294 | { |
12295 | go_assert(type->is_slice_type()); | |
12296 | ||
e67508fa | 12297 | unsigned long lenval; |
23d77f91 | 12298 | Expression* length; |
12299 | if (vals == NULL || vals->empty()) | |
e67508fa | 12300 | lenval = 0; |
23d77f91 | 12301 | else |
12302 | { | |
12303 | if (this->indexes() == NULL) | |
e67508fa | 12304 | lenval = vals->size(); |
23d77f91 | 12305 | else |
e67508fa | 12306 | lenval = indexes->back() + 1; |
23d77f91 | 12307 | } |
12308 | Type* int_type = Type::lookup_integer_type("int"); | |
e67508fa | 12309 | length = Expression::make_integer_ul(lenval, int_type, location); |
23d77f91 | 12310 | Type* element_type = type->array_type()->element_type(); |
12311 | this->valtype_ = Type::make_array_type(element_type, length); | |
12312 | } | |
e440a328 | 12313 | |
12314 | protected: | |
2c809f8f | 12315 | // Note that taking the address of a slice literal is invalid. |
e440a328 | 12316 | |
23d77f91 | 12317 | int |
12318 | do_traverse(Traverse* traverse); | |
12319 | ||
e440a328 | 12320 | Expression* |
12321 | do_copy() | |
12322 | { | |
2c809f8f | 12323 | return new Slice_construction_expression(this->type(), this->indexes(), |
12324 | (this->vals() == NULL | |
12325 | ? NULL | |
12326 | : this->vals()->copy()), | |
12327 | this->location()); | |
e440a328 | 12328 | } |
12329 | ||
ea664253 | 12330 | Bexpression* |
12331 | do_get_backend(Translate_context*); | |
2c809f8f | 12332 | |
12333 | private: | |
12334 | // The type of the values in this slice. | |
12335 | Type* valtype_; | |
e440a328 | 12336 | }; |
12337 | ||
23d77f91 | 12338 | // Traversal. |
12339 | ||
12340 | int | |
12341 | Slice_construction_expression::do_traverse(Traverse* traverse) | |
12342 | { | |
12343 | if (this->Array_construction_expression::do_traverse(traverse) | |
12344 | == TRAVERSE_EXIT) | |
12345 | return TRAVERSE_EXIT; | |
12346 | if (Type::traverse(this->valtype_, traverse) == TRAVERSE_EXIT) | |
12347 | return TRAVERSE_EXIT; | |
12348 | return TRAVERSE_CONTINUE; | |
12349 | } | |
12350 | ||
ea664253 | 12351 | // Return the backend representation for constructing a slice. |
e440a328 | 12352 | |
ea664253 | 12353 | Bexpression* |
12354 | Slice_construction_expression::do_get_backend(Translate_context* context) | |
e440a328 | 12355 | { |
f9c68f17 | 12356 | Array_type* array_type = this->type()->array_type(); |
12357 | if (array_type == NULL) | |
12358 | { | |
c484d925 | 12359 | go_assert(this->type()->is_error()); |
ea664253 | 12360 | return context->backend()->error_expression(); |
f9c68f17 | 12361 | } |
12362 | ||
f23d7786 | 12363 | Location loc = this->location(); |
f9c68f17 | 12364 | Type* element_type = array_type->element_type(); |
23d77f91 | 12365 | go_assert(this->valtype_ != NULL); |
3d60812e | 12366 | |
f23d7786 | 12367 | Expression_list* vals = this->vals(); |
e440a328 | 12368 | if (this->vals() == NULL || this->vals()->empty()) |
12369 | { | |
f23d7786 | 12370 | // We need to create a unique value for the empty array literal. |
12371 | vals = new Expression_list; | |
12372 | vals->push_back(NULL); | |
e440a328 | 12373 | } |
f23d7786 | 12374 | Expression* array_val = |
12375 | new Fixed_array_construction_expression(this->valtype_, this->indexes(), | |
12376 | vals, loc); | |
e440a328 | 12377 | |
f23d7786 | 12378 | bool is_constant_initializer = array_val->is_immutable(); |
d8829beb | 12379 | |
12380 | // We have to copy the initial values into heap memory if we are in | |
12381 | // a function or if the values are not constants. We also have to | |
12382 | // copy them if they may contain pointers in a non-constant context, | |
12383 | // as otherwise the garbage collector won't see them. | |
12384 | bool copy_to_heap = (context->function() != NULL | |
12385 | || !is_constant_initializer | |
12386 | || (element_type->has_pointer() | |
12387 | && !context->is_const())); | |
e440a328 | 12388 | |
f23d7786 | 12389 | Expression* space; |
d8829beb | 12390 | if (!copy_to_heap) |
e440a328 | 12391 | { |
f23d7786 | 12392 | // The initializer will only run once. |
12393 | space = Expression::make_unary(OPERATOR_AND, array_val, loc); | |
12394 | space->unary_expression()->set_is_slice_init(); | |
e440a328 | 12395 | } |
12396 | else | |
f23d7786 | 12397 | space = Expression::make_heap_expression(array_val, loc); |
e440a328 | 12398 | |
2c809f8f | 12399 | // Build a constructor for the slice. |
e440a328 | 12400 | |
f23d7786 | 12401 | Expression* len = this->valtype_->array_type()->length(); |
12402 | Expression* slice_val = | |
12403 | Expression::make_slice_value(this->type(), space, len, len, loc); | |
ea664253 | 12404 | return slice_val->get_backend(context); |
e440a328 | 12405 | } |
12406 | ||
12407 | // Make a slice composite literal. This is used by the type | |
12408 | // descriptor code. | |
12409 | ||
12410 | Expression* | |
12411 | Expression::make_slice_composite_literal(Type* type, Expression_list* vals, | |
b13c66cd | 12412 | Location location) |
e440a328 | 12413 | { |
411eb89e | 12414 | go_assert(type->is_slice_type()); |
2c809f8f | 12415 | return new Slice_construction_expression(type, NULL, vals, location); |
e440a328 | 12416 | } |
12417 | ||
12418 | // Construct a map. | |
12419 | ||
12420 | class Map_construction_expression : public Expression | |
12421 | { | |
12422 | public: | |
12423 | Map_construction_expression(Type* type, Expression_list* vals, | |
b13c66cd | 12424 | Location location) |
e440a328 | 12425 | : Expression(EXPRESSION_MAP_CONSTRUCTION, location), |
2c809f8f | 12426 | type_(type), vals_(vals), element_type_(NULL), constructor_temp_(NULL) |
c484d925 | 12427 | { go_assert(vals == NULL || vals->size() % 2 == 0); } |
e440a328 | 12428 | |
12429 | protected: | |
12430 | int | |
12431 | do_traverse(Traverse* traverse); | |
12432 | ||
2c809f8f | 12433 | Expression* |
12434 | do_flatten(Gogo*, Named_object*, Statement_inserter*); | |
12435 | ||
e440a328 | 12436 | Type* |
12437 | do_type() | |
12438 | { return this->type_; } | |
12439 | ||
12440 | void | |
12441 | do_determine_type(const Type_context*); | |
12442 | ||
12443 | void | |
12444 | do_check_types(Gogo*); | |
12445 | ||
12446 | Expression* | |
12447 | do_copy() | |
12448 | { | |
0f87b2f8 | 12449 | return new Map_construction_expression(this->type_, |
12450 | (this->vals_ == NULL | |
12451 | ? NULL | |
12452 | : this->vals_->copy()), | |
e440a328 | 12453 | this->location()); |
12454 | } | |
12455 | ||
ea664253 | 12456 | Bexpression* |
12457 | do_get_backend(Translate_context*); | |
e440a328 | 12458 | |
12459 | void | |
12460 | do_export(Export*) const; | |
12461 | ||
d751bb78 | 12462 | void |
12463 | do_dump_expression(Ast_dump_context*) const; | |
12464 | ||
e440a328 | 12465 | private: |
12466 | // The type of the map to construct. | |
12467 | Type* type_; | |
12468 | // The list of values. | |
12469 | Expression_list* vals_; | |
2c809f8f | 12470 | // The type of the key-value pair struct for each map element. |
12471 | Struct_type* element_type_; | |
12472 | // A temporary reference to the variable storing the constructor initializer. | |
12473 | Temporary_statement* constructor_temp_; | |
e440a328 | 12474 | }; |
12475 | ||
12476 | // Traversal. | |
12477 | ||
12478 | int | |
12479 | Map_construction_expression::do_traverse(Traverse* traverse) | |
12480 | { | |
12481 | if (this->vals_ != NULL | |
12482 | && this->vals_->traverse(traverse) == TRAVERSE_EXIT) | |
12483 | return TRAVERSE_EXIT; | |
12484 | if (Type::traverse(this->type_, traverse) == TRAVERSE_EXIT) | |
12485 | return TRAVERSE_EXIT; | |
12486 | return TRAVERSE_CONTINUE; | |
12487 | } | |
12488 | ||
2c809f8f | 12489 | // Flatten constructor initializer into a temporary variable since |
12490 | // we need to take its address for __go_construct_map. | |
12491 | ||
12492 | Expression* | |
12493 | Map_construction_expression::do_flatten(Gogo* gogo, Named_object*, | |
12494 | Statement_inserter* inserter) | |
12495 | { | |
12496 | if (!this->is_error_expression() | |
12497 | && this->vals_ != NULL | |
12498 | && !this->vals_->empty() | |
12499 | && this->constructor_temp_ == NULL) | |
12500 | { | |
12501 | Map_type* mt = this->type_->map_type(); | |
12502 | Type* key_type = mt->key_type(); | |
12503 | Type* val_type = mt->val_type(); | |
12504 | this->element_type_ = Type::make_builtin_struct_type(2, | |
12505 | "__key", key_type, | |
12506 | "__val", val_type); | |
12507 | ||
12508 | Expression_list* value_pairs = new Expression_list(); | |
12509 | Location loc = this->location(); | |
12510 | ||
12511 | size_t i = 0; | |
12512 | for (Expression_list::const_iterator pv = this->vals_->begin(); | |
12513 | pv != this->vals_->end(); | |
12514 | ++pv, ++i) | |
12515 | { | |
12516 | Expression_list* key_value_pair = new Expression_list(); | |
12517 | Expression* key = | |
12518 | Expression::convert_for_assignment(gogo, key_type, *pv, loc); | |
12519 | ||
12520 | ++pv; | |
12521 | Expression* val = | |
12522 | Expression::convert_for_assignment(gogo, val_type, *pv, loc); | |
12523 | ||
12524 | key_value_pair->push_back(key); | |
12525 | key_value_pair->push_back(val); | |
12526 | value_pairs->push_back( | |
12527 | Expression::make_struct_composite_literal(this->element_type_, | |
12528 | key_value_pair, loc)); | |
12529 | } | |
12530 | ||
e67508fa | 12531 | Expression* element_count = Expression::make_integer_ul(i, NULL, loc); |
2c809f8f | 12532 | Type* ctor_type = |
12533 | Type::make_array_type(this->element_type_, element_count); | |
12534 | Expression* constructor = | |
12535 | new Fixed_array_construction_expression(ctor_type, NULL, | |
12536 | value_pairs, loc); | |
12537 | ||
12538 | this->constructor_temp_ = | |
12539 | Statement::make_temporary(NULL, constructor, loc); | |
12540 | constructor->issue_nil_check(); | |
12541 | this->constructor_temp_->set_is_address_taken(); | |
12542 | inserter->insert(this->constructor_temp_); | |
12543 | } | |
12544 | ||
12545 | return this; | |
12546 | } | |
12547 | ||
e440a328 | 12548 | // Final type determination. |
12549 | ||
12550 | void | |
12551 | Map_construction_expression::do_determine_type(const Type_context*) | |
12552 | { | |
12553 | if (this->vals_ == NULL) | |
12554 | return; | |
12555 | ||
12556 | Map_type* mt = this->type_->map_type(); | |
12557 | Type_context key_context(mt->key_type(), false); | |
12558 | Type_context val_context(mt->val_type(), false); | |
12559 | for (Expression_list::const_iterator pv = this->vals_->begin(); | |
12560 | pv != this->vals_->end(); | |
12561 | ++pv) | |
12562 | { | |
12563 | (*pv)->determine_type(&key_context); | |
12564 | ++pv; | |
12565 | (*pv)->determine_type(&val_context); | |
12566 | } | |
12567 | } | |
12568 | ||
12569 | // Check types. | |
12570 | ||
12571 | void | |
12572 | Map_construction_expression::do_check_types(Gogo*) | |
12573 | { | |
12574 | if (this->vals_ == NULL) | |
12575 | return; | |
12576 | ||
12577 | Map_type* mt = this->type_->map_type(); | |
12578 | int i = 0; | |
12579 | Type* key_type = mt->key_type(); | |
12580 | Type* val_type = mt->val_type(); | |
12581 | for (Expression_list::const_iterator pv = this->vals_->begin(); | |
12582 | pv != this->vals_->end(); | |
12583 | ++pv, ++i) | |
12584 | { | |
12585 | if (!Type::are_assignable(key_type, (*pv)->type(), NULL)) | |
12586 | { | |
12587 | error_at((*pv)->location(), | |
12588 | "incompatible type for element %d key in map construction", | |
12589 | i + 1); | |
12590 | this->set_is_error(); | |
12591 | } | |
12592 | ++pv; | |
12593 | if (!Type::are_assignable(val_type, (*pv)->type(), NULL)) | |
12594 | { | |
12595 | error_at((*pv)->location(), | |
12596 | ("incompatible type for element %d value " | |
12597 | "in map construction"), | |
12598 | i + 1); | |
12599 | this->set_is_error(); | |
12600 | } | |
12601 | } | |
12602 | } | |
12603 | ||
ea664253 | 12604 | // Return the backend representation for constructing a map. |
e440a328 | 12605 | |
ea664253 | 12606 | Bexpression* |
12607 | Map_construction_expression::do_get_backend(Translate_context* context) | |
e440a328 | 12608 | { |
2c809f8f | 12609 | if (this->is_error_expression()) |
ea664253 | 12610 | return context->backend()->error_expression(); |
2c809f8f | 12611 | Location loc = this->location(); |
e440a328 | 12612 | |
e440a328 | 12613 | size_t i = 0; |
2c809f8f | 12614 | Expression* ventries; |
e440a328 | 12615 | if (this->vals_ == NULL || this->vals_->empty()) |
2c809f8f | 12616 | ventries = Expression::make_nil(loc); |
e440a328 | 12617 | else |
12618 | { | |
2c809f8f | 12619 | go_assert(this->constructor_temp_ != NULL); |
12620 | i = this->vals_->size() / 2; | |
e440a328 | 12621 | |
2c809f8f | 12622 | Expression* ctor_ref = |
12623 | Expression::make_temporary_reference(this->constructor_temp_, loc); | |
12624 | ventries = Expression::make_unary(OPERATOR_AND, ctor_ref, loc); | |
12625 | } | |
e440a328 | 12626 | |
2c809f8f | 12627 | Map_type* mt = this->type_->map_type(); |
12628 | if (this->element_type_ == NULL) | |
12629 | this->element_type_ = | |
12630 | Type::make_builtin_struct_type(2, | |
12631 | "__key", mt->key_type(), | |
12632 | "__val", mt->val_type()); | |
12633 | Expression* descriptor = Expression::make_map_descriptor(mt, loc); | |
12634 | ||
12635 | Type* uintptr_t = Type::lookup_integer_type("uintptr"); | |
e67508fa | 12636 | Expression* count = Expression::make_integer_ul(i, uintptr_t, loc); |
2c809f8f | 12637 | |
12638 | Expression* entry_size = | |
12639 | Expression::make_type_info(this->element_type_, TYPE_INFO_SIZE); | |
12640 | ||
12641 | unsigned int field_index; | |
12642 | const Struct_field* valfield = | |
12643 | this->element_type_->find_local_field("__val", &field_index); | |
12644 | Expression* val_offset = | |
12645 | Expression::make_struct_field_offset(this->element_type_, valfield); | |
12646 | Expression* val_size = | |
12647 | Expression::make_type_info(mt->val_type(), TYPE_INFO_SIZE); | |
12648 | ||
12649 | Expression* map_ctor = | |
12650 | Runtime::make_call(Runtime::CONSTRUCT_MAP, loc, 6, descriptor, count, | |
12651 | entry_size, val_offset, val_size, ventries); | |
ea664253 | 12652 | return map_ctor->get_backend(context); |
2c809f8f | 12653 | } |
e440a328 | 12654 | |
2c809f8f | 12655 | // Export an array construction. |
e440a328 | 12656 | |
2c809f8f | 12657 | void |
12658 | Map_construction_expression::do_export(Export* exp) const | |
12659 | { | |
12660 | exp->write_c_string("convert("); | |
12661 | exp->write_type(this->type_); | |
12662 | for (Expression_list::const_iterator pv = this->vals_->begin(); | |
12663 | pv != this->vals_->end(); | |
12664 | ++pv) | |
12665 | { | |
12666 | exp->write_c_string(", "); | |
12667 | (*pv)->export_expression(exp); | |
12668 | } | |
12669 | exp->write_c_string(")"); | |
12670 | } | |
e440a328 | 12671 | |
2c809f8f | 12672 | // Dump ast representation for a map construction expression. |
d751bb78 | 12673 | |
12674 | void | |
12675 | Map_construction_expression::do_dump_expression( | |
12676 | Ast_dump_context* ast_dump_context) const | |
12677 | { | |
d751bb78 | 12678 | ast_dump_context->ostream() << "{" ; |
8b1c301d | 12679 | ast_dump_context->dump_expression_list(this->vals_, true); |
d751bb78 | 12680 | ast_dump_context->ostream() << "}"; |
12681 | } | |
12682 | ||
e440a328 | 12683 | // A general composite literal. This is lowered to a type specific |
12684 | // version. | |
12685 | ||
12686 | class Composite_literal_expression : public Parser_expression | |
12687 | { | |
12688 | public: | |
12689 | Composite_literal_expression(Type* type, int depth, bool has_keys, | |
62750cd5 | 12690 | Expression_list* vals, bool all_are_names, |
12691 | Location location) | |
e440a328 | 12692 | : Parser_expression(EXPRESSION_COMPOSITE_LITERAL, location), |
62750cd5 | 12693 | type_(type), depth_(depth), vals_(vals), has_keys_(has_keys), |
12694 | all_are_names_(all_are_names) | |
e440a328 | 12695 | { } |
12696 | ||
12697 | protected: | |
12698 | int | |
12699 | do_traverse(Traverse* traverse); | |
12700 | ||
12701 | Expression* | |
ceeb4318 | 12702 | do_lower(Gogo*, Named_object*, Statement_inserter*, int); |
e440a328 | 12703 | |
12704 | Expression* | |
12705 | do_copy() | |
12706 | { | |
12707 | return new Composite_literal_expression(this->type_, this->depth_, | |
12708 | this->has_keys_, | |
12709 | (this->vals_ == NULL | |
12710 | ? NULL | |
12711 | : this->vals_->copy()), | |
62750cd5 | 12712 | this->all_are_names_, |
e440a328 | 12713 | this->location()); |
12714 | } | |
12715 | ||
d751bb78 | 12716 | void |
12717 | do_dump_expression(Ast_dump_context*) const; | |
12718 | ||
e440a328 | 12719 | private: |
12720 | Expression* | |
81c4b26b | 12721 | lower_struct(Gogo*, Type*); |
e440a328 | 12722 | |
12723 | Expression* | |
113ef6a5 | 12724 | lower_array(Type*); |
e440a328 | 12725 | |
12726 | Expression* | |
ffe743ca | 12727 | make_array(Type*, const std::vector<unsigned long>*, Expression_list*); |
e440a328 | 12728 | |
12729 | Expression* | |
ceeb4318 | 12730 | lower_map(Gogo*, Named_object*, Statement_inserter*, Type*); |
e440a328 | 12731 | |
12732 | // The type of the composite literal. | |
12733 | Type* type_; | |
12734 | // The depth within a list of composite literals within a composite | |
12735 | // literal, when the type is omitted. | |
12736 | int depth_; | |
12737 | // The values to put in the composite literal. | |
12738 | Expression_list* vals_; | |
12739 | // If this is true, then VALS_ is a list of pairs: a key and a | |
12740 | // value. In an array initializer, a missing key will be NULL. | |
12741 | bool has_keys_; | |
62750cd5 | 12742 | // If this is true, then HAS_KEYS_ is true, and every key is a |
12743 | // simple identifier. | |
12744 | bool all_are_names_; | |
e440a328 | 12745 | }; |
12746 | ||
12747 | // Traversal. | |
12748 | ||
12749 | int | |
12750 | Composite_literal_expression::do_traverse(Traverse* traverse) | |
12751 | { | |
dbffccfc | 12752 | if (Type::traverse(this->type_, traverse) == TRAVERSE_EXIT) |
e440a328 | 12753 | return TRAVERSE_EXIT; |
dbffccfc | 12754 | |
12755 | // If this is a struct composite literal with keys, then the keys | |
12756 | // are field names, not expressions. We don't want to traverse them | |
12757 | // in that case. If we do, we can give an erroneous error "variable | |
12758 | // initializer refers to itself." See bug482.go in the testsuite. | |
12759 | if (this->has_keys_ && this->vals_ != NULL) | |
12760 | { | |
12761 | // The type may not be resolvable at this point. | |
12762 | Type* type = this->type_; | |
a01f2481 | 12763 | |
12764 | for (int depth = this->depth_; depth > 0; --depth) | |
12765 | { | |
12766 | if (type->array_type() != NULL) | |
12767 | type = type->array_type()->element_type(); | |
12768 | else if (type->map_type() != NULL) | |
12769 | type = type->map_type()->val_type(); | |
12770 | else | |
12771 | { | |
12772 | // This error will be reported during lowering. | |
12773 | return TRAVERSE_CONTINUE; | |
12774 | } | |
12775 | } | |
12776 | ||
dbffccfc | 12777 | while (true) |
12778 | { | |
12779 | if (type->classification() == Type::TYPE_NAMED) | |
12780 | type = type->named_type()->real_type(); | |
12781 | else if (type->classification() == Type::TYPE_FORWARD) | |
12782 | { | |
12783 | Type* t = type->forwarded(); | |
12784 | if (t == type) | |
12785 | break; | |
12786 | type = t; | |
12787 | } | |
12788 | else | |
12789 | break; | |
12790 | } | |
12791 | ||
12792 | if (type->classification() == Type::TYPE_STRUCT) | |
12793 | { | |
12794 | Expression_list::iterator p = this->vals_->begin(); | |
12795 | while (p != this->vals_->end()) | |
12796 | { | |
12797 | // Skip key. | |
12798 | ++p; | |
12799 | go_assert(p != this->vals_->end()); | |
12800 | if (Expression::traverse(&*p, traverse) == TRAVERSE_EXIT) | |
12801 | return TRAVERSE_EXIT; | |
12802 | ++p; | |
12803 | } | |
12804 | return TRAVERSE_CONTINUE; | |
12805 | } | |
12806 | } | |
12807 | ||
12808 | if (this->vals_ != NULL) | |
12809 | return this->vals_->traverse(traverse); | |
12810 | ||
12811 | return TRAVERSE_CONTINUE; | |
e440a328 | 12812 | } |
12813 | ||
12814 | // Lower a generic composite literal into a specific version based on | |
12815 | // the type. | |
12816 | ||
12817 | Expression* | |
ceeb4318 | 12818 | Composite_literal_expression::do_lower(Gogo* gogo, Named_object* function, |
12819 | Statement_inserter* inserter, int) | |
e440a328 | 12820 | { |
12821 | Type* type = this->type_; | |
12822 | ||
12823 | for (int depth = this->depth_; depth > 0; --depth) | |
12824 | { | |
12825 | if (type->array_type() != NULL) | |
12826 | type = type->array_type()->element_type(); | |
12827 | else if (type->map_type() != NULL) | |
12828 | type = type->map_type()->val_type(); | |
12829 | else | |
12830 | { | |
5c13bd80 | 12831 | if (!type->is_error()) |
e440a328 | 12832 | error_at(this->location(), |
12833 | ("may only omit types within composite literals " | |
12834 | "of slice, array, or map type")); | |
12835 | return Expression::make_error(this->location()); | |
12836 | } | |
12837 | } | |
12838 | ||
e00772b3 | 12839 | Type *pt = type->points_to(); |
12840 | bool is_pointer = false; | |
12841 | if (pt != NULL) | |
12842 | { | |
12843 | is_pointer = true; | |
12844 | type = pt; | |
12845 | } | |
12846 | ||
12847 | Expression* ret; | |
5c13bd80 | 12848 | if (type->is_error()) |
e440a328 | 12849 | return Expression::make_error(this->location()); |
12850 | else if (type->struct_type() != NULL) | |
e00772b3 | 12851 | ret = this->lower_struct(gogo, type); |
e440a328 | 12852 | else if (type->array_type() != NULL) |
113ef6a5 | 12853 | ret = this->lower_array(type); |
e440a328 | 12854 | else if (type->map_type() != NULL) |
e00772b3 | 12855 | ret = this->lower_map(gogo, function, inserter, type); |
e440a328 | 12856 | else |
12857 | { | |
12858 | error_at(this->location(), | |
12859 | ("expected struct, slice, array, or map type " | |
12860 | "for composite literal")); | |
12861 | return Expression::make_error(this->location()); | |
12862 | } | |
e00772b3 | 12863 | |
12864 | if (is_pointer) | |
2c809f8f | 12865 | ret = Expression::make_heap_expression(ret, this->location()); |
e00772b3 | 12866 | |
12867 | return ret; | |
e440a328 | 12868 | } |
12869 | ||
12870 | // Lower a struct composite literal. | |
12871 | ||
12872 | Expression* | |
81c4b26b | 12873 | Composite_literal_expression::lower_struct(Gogo* gogo, Type* type) |
e440a328 | 12874 | { |
b13c66cd | 12875 | Location location = this->location(); |
e440a328 | 12876 | Struct_type* st = type->struct_type(); |
12877 | if (this->vals_ == NULL || !this->has_keys_) | |
07daa4e7 | 12878 | { |
e6013c28 | 12879 | if (this->vals_ != NULL |
12880 | && !this->vals_->empty() | |
12881 | && type->named_type() != NULL | |
12882 | && type->named_type()->named_object()->package() != NULL) | |
12883 | { | |
12884 | for (Struct_field_list::const_iterator pf = st->fields()->begin(); | |
12885 | pf != st->fields()->end(); | |
12886 | ++pf) | |
07daa4e7 | 12887 | { |
e6013c28 | 12888 | if (Gogo::is_hidden_name(pf->field_name())) |
07daa4e7 | 12889 | error_at(this->location(), |
e6013c28 | 12890 | "assignment of unexported field %qs in %qs literal", |
12891 | Gogo::message_name(pf->field_name()).c_str(), | |
12892 | type->named_type()->message_name().c_str()); | |
07daa4e7 | 12893 | } |
12894 | } | |
12895 | ||
12896 | return new Struct_construction_expression(type, this->vals_, location); | |
12897 | } | |
e440a328 | 12898 | |
12899 | size_t field_count = st->field_count(); | |
12900 | std::vector<Expression*> vals(field_count); | |
0c4f5a19 | 12901 | std::vector<int>* traverse_order = new(std::vector<int>); |
e440a328 | 12902 | Expression_list::const_iterator p = this->vals_->begin(); |
62750cd5 | 12903 | Expression* external_expr = NULL; |
12904 | const Named_object* external_no = NULL; | |
e440a328 | 12905 | while (p != this->vals_->end()) |
12906 | { | |
12907 | Expression* name_expr = *p; | |
12908 | ||
12909 | ++p; | |
c484d925 | 12910 | go_assert(p != this->vals_->end()); |
e440a328 | 12911 | Expression* val = *p; |
12912 | ||
12913 | ++p; | |
12914 | ||
12915 | if (name_expr == NULL) | |
12916 | { | |
12917 | error_at(val->location(), "mixture of field and value initializers"); | |
12918 | return Expression::make_error(location); | |
12919 | } | |
12920 | ||
12921 | bool bad_key = false; | |
12922 | std::string name; | |
81c4b26b | 12923 | const Named_object* no = NULL; |
e440a328 | 12924 | switch (name_expr->classification()) |
12925 | { | |
12926 | case EXPRESSION_UNKNOWN_REFERENCE: | |
12927 | name = name_expr->unknown_expression()->name(); | |
7f7ce694 | 12928 | if (type->named_type() != NULL) |
12929 | { | |
12930 | // If the named object found for this field name comes from a | |
12931 | // different package than the struct it is a part of, do not count | |
12932 | // this incorrect lookup as a usage of the object's package. | |
12933 | no = name_expr->unknown_expression()->named_object(); | |
12934 | if (no->package() != NULL | |
12935 | && no->package() != type->named_type()->named_object()->package()) | |
12936 | no->package()->forget_usage(name_expr); | |
12937 | } | |
e440a328 | 12938 | break; |
12939 | ||
12940 | case EXPRESSION_CONST_REFERENCE: | |
81c4b26b | 12941 | no = static_cast<Const_expression*>(name_expr)->named_object(); |
e440a328 | 12942 | break; |
12943 | ||
12944 | case EXPRESSION_TYPE: | |
12945 | { | |
12946 | Type* t = name_expr->type(); | |
12947 | Named_type* nt = t->named_type(); | |
12948 | if (nt == NULL) | |
12949 | bad_key = true; | |
12950 | else | |
81c4b26b | 12951 | no = nt->named_object(); |
e440a328 | 12952 | } |
12953 | break; | |
12954 | ||
12955 | case EXPRESSION_VAR_REFERENCE: | |
81c4b26b | 12956 | no = name_expr->var_expression()->named_object(); |
e440a328 | 12957 | break; |
12958 | ||
12959 | case EXPRESSION_FUNC_REFERENCE: | |
81c4b26b | 12960 | no = name_expr->func_expression()->named_object(); |
e440a328 | 12961 | break; |
12962 | ||
12963 | case EXPRESSION_UNARY: | |
12964 | // If there is a local variable around with the same name as | |
12965 | // the field, and this occurs in the closure, then the | |
12966 | // parser may turn the field reference into an indirection | |
12967 | // through the closure. FIXME: This is a mess. | |
12968 | { | |
12969 | bad_key = true; | |
12970 | Unary_expression* ue = static_cast<Unary_expression*>(name_expr); | |
12971 | if (ue->op() == OPERATOR_MULT) | |
12972 | { | |
12973 | Field_reference_expression* fre = | |
12974 | ue->operand()->field_reference_expression(); | |
12975 | if (fre != NULL) | |
12976 | { | |
12977 | Struct_type* st = | |
12978 | fre->expr()->type()->deref()->struct_type(); | |
12979 | if (st != NULL) | |
12980 | { | |
12981 | const Struct_field* sf = st->field(fre->field_index()); | |
12982 | name = sf->field_name(); | |
2d29d278 | 12983 | |
12984 | // See below. FIXME. | |
12985 | if (!Gogo::is_hidden_name(name) | |
12986 | && name[0] >= 'a' | |
12987 | && name[0] <= 'z') | |
12988 | { | |
12989 | if (gogo->lookup_global(name.c_str()) != NULL) | |
12990 | name = gogo->pack_hidden_name(name, false); | |
12991 | } | |
12992 | ||
e440a328 | 12993 | char buf[20]; |
12994 | snprintf(buf, sizeof buf, "%u", fre->field_index()); | |
12995 | size_t buflen = strlen(buf); | |
12996 | if (name.compare(name.length() - buflen, buflen, buf) | |
12997 | == 0) | |
12998 | { | |
12999 | name = name.substr(0, name.length() - buflen); | |
13000 | bad_key = false; | |
13001 | } | |
13002 | } | |
13003 | } | |
13004 | } | |
13005 | } | |
13006 | break; | |
13007 | ||
13008 | default: | |
13009 | bad_key = true; | |
13010 | break; | |
13011 | } | |
13012 | if (bad_key) | |
13013 | { | |
13014 | error_at(name_expr->location(), "expected struct field name"); | |
13015 | return Expression::make_error(location); | |
13016 | } | |
13017 | ||
81c4b26b | 13018 | if (no != NULL) |
13019 | { | |
62750cd5 | 13020 | if (no->package() != NULL && external_expr == NULL) |
13021 | { | |
13022 | external_expr = name_expr; | |
13023 | external_no = no; | |
13024 | } | |
13025 | ||
81c4b26b | 13026 | name = no->name(); |
13027 | ||
13028 | // A predefined name won't be packed. If it starts with a | |
13029 | // lower case letter we need to check for that case, because | |
2d29d278 | 13030 | // the field name will be packed. FIXME. |
81c4b26b | 13031 | if (!Gogo::is_hidden_name(name) |
13032 | && name[0] >= 'a' | |
13033 | && name[0] <= 'z') | |
13034 | { | |
13035 | Named_object* gno = gogo->lookup_global(name.c_str()); | |
13036 | if (gno == no) | |
13037 | name = gogo->pack_hidden_name(name, false); | |
13038 | } | |
13039 | } | |
13040 | ||
e440a328 | 13041 | unsigned int index; |
13042 | const Struct_field* sf = st->find_local_field(name, &index); | |
13043 | if (sf == NULL) | |
13044 | { | |
13045 | error_at(name_expr->location(), "unknown field %qs in %qs", | |
13046 | Gogo::message_name(name).c_str(), | |
13047 | (type->named_type() != NULL | |
13048 | ? type->named_type()->message_name().c_str() | |
13049 | : "unnamed struct")); | |
13050 | return Expression::make_error(location); | |
13051 | } | |
13052 | if (vals[index] != NULL) | |
13053 | { | |
13054 | error_at(name_expr->location(), | |
13055 | "duplicate value for field %qs in %qs", | |
13056 | Gogo::message_name(name).c_str(), | |
13057 | (type->named_type() != NULL | |
13058 | ? type->named_type()->message_name().c_str() | |
13059 | : "unnamed struct")); | |
13060 | return Expression::make_error(location); | |
13061 | } | |
13062 | ||
07daa4e7 | 13063 | if (type->named_type() != NULL |
13064 | && type->named_type()->named_object()->package() != NULL | |
13065 | && Gogo::is_hidden_name(sf->field_name())) | |
13066 | error_at(name_expr->location(), | |
13067 | "assignment of unexported field %qs in %qs literal", | |
13068 | Gogo::message_name(sf->field_name()).c_str(), | |
13069 | type->named_type()->message_name().c_str()); | |
07daa4e7 | 13070 | |
e440a328 | 13071 | vals[index] = val; |
0c4f5a19 | 13072 | traverse_order->push_back(index); |
e440a328 | 13073 | } |
13074 | ||
62750cd5 | 13075 | if (!this->all_are_names_) |
13076 | { | |
13077 | // This is a weird case like bug462 in the testsuite. | |
13078 | if (external_expr == NULL) | |
13079 | error_at(this->location(), "unknown field in %qs literal", | |
13080 | (type->named_type() != NULL | |
13081 | ? type->named_type()->message_name().c_str() | |
13082 | : "unnamed struct")); | |
13083 | else | |
13084 | error_at(external_expr->location(), "unknown field %qs in %qs", | |
13085 | external_no->message_name().c_str(), | |
13086 | (type->named_type() != NULL | |
13087 | ? type->named_type()->message_name().c_str() | |
13088 | : "unnamed struct")); | |
13089 | return Expression::make_error(location); | |
13090 | } | |
13091 | ||
e440a328 | 13092 | Expression_list* list = new Expression_list; |
13093 | list->reserve(field_count); | |
13094 | for (size_t i = 0; i < field_count; ++i) | |
13095 | list->push_back(vals[i]); | |
13096 | ||
0c4f5a19 | 13097 | Struct_construction_expression* ret = |
13098 | new Struct_construction_expression(type, list, location); | |
13099 | ret->set_traverse_order(traverse_order); | |
13100 | return ret; | |
e440a328 | 13101 | } |
13102 | ||
00773463 | 13103 | // Used to sort an index/value array. |
13104 | ||
13105 | class Index_value_compare | |
13106 | { | |
13107 | public: | |
13108 | bool | |
13109 | operator()(const std::pair<unsigned long, Expression*>& a, | |
13110 | const std::pair<unsigned long, Expression*>& b) | |
13111 | { return a.first < b.first; } | |
13112 | }; | |
13113 | ||
e440a328 | 13114 | // Lower an array composite literal. |
13115 | ||
13116 | Expression* | |
113ef6a5 | 13117 | Composite_literal_expression::lower_array(Type* type) |
e440a328 | 13118 | { |
b13c66cd | 13119 | Location location = this->location(); |
e440a328 | 13120 | if (this->vals_ == NULL || !this->has_keys_) |
ffe743ca | 13121 | return this->make_array(type, NULL, this->vals_); |
e440a328 | 13122 | |
ffe743ca | 13123 | std::vector<unsigned long>* indexes = new std::vector<unsigned long>; |
13124 | indexes->reserve(this->vals_->size()); | |
00773463 | 13125 | bool indexes_out_of_order = false; |
ffe743ca | 13126 | Expression_list* vals = new Expression_list(); |
13127 | vals->reserve(this->vals_->size()); | |
e440a328 | 13128 | unsigned long index = 0; |
13129 | Expression_list::const_iterator p = this->vals_->begin(); | |
13130 | while (p != this->vals_->end()) | |
13131 | { | |
13132 | Expression* index_expr = *p; | |
13133 | ||
13134 | ++p; | |
c484d925 | 13135 | go_assert(p != this->vals_->end()); |
e440a328 | 13136 | Expression* val = *p; |
13137 | ||
13138 | ++p; | |
13139 | ||
ffe743ca | 13140 | if (index_expr == NULL) |
13141 | { | |
13142 | if (!indexes->empty()) | |
13143 | indexes->push_back(index); | |
13144 | } | |
13145 | else | |
e440a328 | 13146 | { |
ffe743ca | 13147 | if (indexes->empty() && !vals->empty()) |
13148 | { | |
13149 | for (size_t i = 0; i < vals->size(); ++i) | |
13150 | indexes->push_back(i); | |
13151 | } | |
13152 | ||
0c77715b | 13153 | Numeric_constant nc; |
13154 | if (!index_expr->numeric_constant_value(&nc)) | |
e440a328 | 13155 | { |
e440a328 | 13156 | error_at(index_expr->location(), |
13157 | "index expression is not integer constant"); | |
13158 | return Expression::make_error(location); | |
13159 | } | |
6f6d9955 | 13160 | |
0c77715b | 13161 | switch (nc.to_unsigned_long(&index)) |
e440a328 | 13162 | { |
0c77715b | 13163 | case Numeric_constant::NC_UL_VALID: |
13164 | break; | |
13165 | case Numeric_constant::NC_UL_NOTINT: | |
13166 | error_at(index_expr->location(), | |
13167 | "index expression is not integer constant"); | |
13168 | return Expression::make_error(location); | |
13169 | case Numeric_constant::NC_UL_NEGATIVE: | |
e440a328 | 13170 | error_at(index_expr->location(), "index expression is negative"); |
13171 | return Expression::make_error(location); | |
0c77715b | 13172 | case Numeric_constant::NC_UL_BIG: |
e440a328 | 13173 | error_at(index_expr->location(), "index value overflow"); |
13174 | return Expression::make_error(location); | |
0c77715b | 13175 | default: |
13176 | go_unreachable(); | |
e440a328 | 13177 | } |
6f6d9955 | 13178 | |
13179 | Named_type* ntype = Type::lookup_integer_type("int"); | |
13180 | Integer_type* inttype = ntype->integer_type(); | |
0c77715b | 13181 | if (sizeof(index) <= static_cast<size_t>(inttype->bits() * 8) |
13182 | && index >> (inttype->bits() - 1) != 0) | |
6f6d9955 | 13183 | { |
6f6d9955 | 13184 | error_at(index_expr->location(), "index value overflow"); |
13185 | return Expression::make_error(location); | |
13186 | } | |
13187 | ||
ffe743ca | 13188 | if (std::find(indexes->begin(), indexes->end(), index) |
13189 | != indexes->end()) | |
e440a328 | 13190 | { |
ffe743ca | 13191 | error_at(index_expr->location(), "duplicate value for index %lu", |
e440a328 | 13192 | index); |
13193 | return Expression::make_error(location); | |
13194 | } | |
ffe743ca | 13195 | |
00773463 | 13196 | if (!indexes->empty() && index < indexes->back()) |
13197 | indexes_out_of_order = true; | |
13198 | ||
ffe743ca | 13199 | indexes->push_back(index); |
e440a328 | 13200 | } |
13201 | ||
ffe743ca | 13202 | vals->push_back(val); |
13203 | ||
e440a328 | 13204 | ++index; |
13205 | } | |
13206 | ||
ffe743ca | 13207 | if (indexes->empty()) |
13208 | { | |
13209 | delete indexes; | |
13210 | indexes = NULL; | |
13211 | } | |
e440a328 | 13212 | |
00773463 | 13213 | if (indexes_out_of_order) |
13214 | { | |
13215 | typedef std::vector<std::pair<unsigned long, Expression*> > V; | |
13216 | ||
13217 | V v; | |
13218 | v.reserve(indexes->size()); | |
13219 | std::vector<unsigned long>::const_iterator pi = indexes->begin(); | |
13220 | for (Expression_list::const_iterator pe = vals->begin(); | |
13221 | pe != vals->end(); | |
13222 | ++pe, ++pi) | |
13223 | v.push_back(std::make_pair(*pi, *pe)); | |
13224 | ||
13225 | std::sort(v.begin(), v.end(), Index_value_compare()); | |
13226 | ||
13227 | delete indexes; | |
13228 | delete vals; | |
13229 | indexes = new std::vector<unsigned long>(); | |
13230 | indexes->reserve(v.size()); | |
13231 | vals = new Expression_list(); | |
13232 | vals->reserve(v.size()); | |
13233 | ||
13234 | for (V::const_iterator p = v.begin(); p != v.end(); ++p) | |
13235 | { | |
13236 | indexes->push_back(p->first); | |
13237 | vals->push_back(p->second); | |
13238 | } | |
13239 | } | |
13240 | ||
ffe743ca | 13241 | return this->make_array(type, indexes, vals); |
e440a328 | 13242 | } |
13243 | ||
13244 | // Actually build the array composite literal. This handles | |
13245 | // [...]{...}. | |
13246 | ||
13247 | Expression* | |
ffe743ca | 13248 | Composite_literal_expression::make_array( |
13249 | Type* type, | |
13250 | const std::vector<unsigned long>* indexes, | |
13251 | Expression_list* vals) | |
e440a328 | 13252 | { |
b13c66cd | 13253 | Location location = this->location(); |
e440a328 | 13254 | Array_type* at = type->array_type(); |
ffe743ca | 13255 | |
e440a328 | 13256 | if (at->length() != NULL && at->length()->is_nil_expression()) |
13257 | { | |
ffe743ca | 13258 | size_t size; |
13259 | if (vals == NULL) | |
13260 | size = 0; | |
00773463 | 13261 | else if (indexes != NULL) |
13262 | size = indexes->back() + 1; | |
13263 | else | |
ffe743ca | 13264 | { |
13265 | size = vals->size(); | |
13266 | Integer_type* it = Type::lookup_integer_type("int")->integer_type(); | |
13267 | if (sizeof(size) <= static_cast<size_t>(it->bits() * 8) | |
13268 | && size >> (it->bits() - 1) != 0) | |
13269 | { | |
13270 | error_at(location, "too many elements in composite literal"); | |
13271 | return Expression::make_error(location); | |
13272 | } | |
13273 | } | |
ffe743ca | 13274 | |
e67508fa | 13275 | Expression* elen = Expression::make_integer_ul(size, NULL, location); |
e440a328 | 13276 | at = Type::make_array_type(at->element_type(), elen); |
13277 | type = at; | |
13278 | } | |
ffe743ca | 13279 | else if (at->length() != NULL |
13280 | && !at->length()->is_error_expression() | |
13281 | && this->vals_ != NULL) | |
13282 | { | |
13283 | Numeric_constant nc; | |
13284 | unsigned long val; | |
13285 | if (at->length()->numeric_constant_value(&nc) | |
13286 | && nc.to_unsigned_long(&val) == Numeric_constant::NC_UL_VALID) | |
13287 | { | |
13288 | if (indexes == NULL) | |
13289 | { | |
13290 | if (this->vals_->size() > val) | |
13291 | { | |
13292 | error_at(location, "too many elements in composite literal"); | |
13293 | return Expression::make_error(location); | |
13294 | } | |
13295 | } | |
13296 | else | |
13297 | { | |
00773463 | 13298 | unsigned long max = indexes->back(); |
ffe743ca | 13299 | if (max >= val) |
13300 | { | |
13301 | error_at(location, | |
13302 | ("some element keys in composite literal " | |
13303 | "are out of range")); | |
13304 | return Expression::make_error(location); | |
13305 | } | |
13306 | } | |
13307 | } | |
13308 | } | |
13309 | ||
e440a328 | 13310 | if (at->length() != NULL) |
ffe743ca | 13311 | return new Fixed_array_construction_expression(type, indexes, vals, |
13312 | location); | |
e440a328 | 13313 | else |
2c809f8f | 13314 | return new Slice_construction_expression(type, indexes, vals, location); |
e440a328 | 13315 | } |
13316 | ||
13317 | // Lower a map composite literal. | |
13318 | ||
13319 | Expression* | |
a287720d | 13320 | Composite_literal_expression::lower_map(Gogo* gogo, Named_object* function, |
ceeb4318 | 13321 | Statement_inserter* inserter, |
a287720d | 13322 | Type* type) |
e440a328 | 13323 | { |
b13c66cd | 13324 | Location location = this->location(); |
e440a328 | 13325 | if (this->vals_ != NULL) |
13326 | { | |
13327 | if (!this->has_keys_) | |
13328 | { | |
13329 | error_at(location, "map composite literal must have keys"); | |
13330 | return Expression::make_error(location); | |
13331 | } | |
13332 | ||
a287720d | 13333 | for (Expression_list::iterator p = this->vals_->begin(); |
e440a328 | 13334 | p != this->vals_->end(); |
13335 | p += 2) | |
13336 | { | |
13337 | if (*p == NULL) | |
13338 | { | |
13339 | ++p; | |
13340 | error_at((*p)->location(), | |
13341 | "map composite literal must have keys for every value"); | |
13342 | return Expression::make_error(location); | |
13343 | } | |
a287720d | 13344 | // Make sure we have lowered the key; it may not have been |
13345 | // lowered in order to handle keys for struct composite | |
13346 | // literals. Lower it now to get the right error message. | |
13347 | if ((*p)->unknown_expression() != NULL) | |
13348 | { | |
13349 | (*p)->unknown_expression()->clear_is_composite_literal_key(); | |
ceeb4318 | 13350 | gogo->lower_expression(function, inserter, &*p); |
c484d925 | 13351 | go_assert((*p)->is_error_expression()); |
a287720d | 13352 | return Expression::make_error(location); |
13353 | } | |
e440a328 | 13354 | } |
13355 | } | |
13356 | ||
13357 | return new Map_construction_expression(type, this->vals_, location); | |
13358 | } | |
13359 | ||
d751bb78 | 13360 | // Dump ast representation for a composite literal expression. |
13361 | ||
13362 | void | |
13363 | Composite_literal_expression::do_dump_expression( | |
13364 | Ast_dump_context* ast_dump_context) const | |
13365 | { | |
8b1c301d | 13366 | ast_dump_context->ostream() << "composite("; |
d751bb78 | 13367 | ast_dump_context->dump_type(this->type_); |
13368 | ast_dump_context->ostream() << ", {"; | |
8b1c301d | 13369 | ast_dump_context->dump_expression_list(this->vals_, this->has_keys_); |
d751bb78 | 13370 | ast_dump_context->ostream() << "})"; |
13371 | } | |
13372 | ||
e440a328 | 13373 | // Make a composite literal expression. |
13374 | ||
13375 | Expression* | |
13376 | Expression::make_composite_literal(Type* type, int depth, bool has_keys, | |
62750cd5 | 13377 | Expression_list* vals, bool all_are_names, |
b13c66cd | 13378 | Location location) |
e440a328 | 13379 | { |
13380 | return new Composite_literal_expression(type, depth, has_keys, vals, | |
62750cd5 | 13381 | all_are_names, location); |
e440a328 | 13382 | } |
13383 | ||
13384 | // Return whether this expression is a composite literal. | |
13385 | ||
13386 | bool | |
13387 | Expression::is_composite_literal() const | |
13388 | { | |
13389 | switch (this->classification_) | |
13390 | { | |
13391 | case EXPRESSION_COMPOSITE_LITERAL: | |
13392 | case EXPRESSION_STRUCT_CONSTRUCTION: | |
13393 | case EXPRESSION_FIXED_ARRAY_CONSTRUCTION: | |
2c809f8f | 13394 | case EXPRESSION_SLICE_CONSTRUCTION: |
e440a328 | 13395 | case EXPRESSION_MAP_CONSTRUCTION: |
13396 | return true; | |
13397 | default: | |
13398 | return false; | |
13399 | } | |
13400 | } | |
13401 | ||
13402 | // Return whether this expression is a composite literal which is not | |
13403 | // constant. | |
13404 | ||
13405 | bool | |
13406 | Expression::is_nonconstant_composite_literal() const | |
13407 | { | |
13408 | switch (this->classification_) | |
13409 | { | |
13410 | case EXPRESSION_STRUCT_CONSTRUCTION: | |
13411 | { | |
13412 | const Struct_construction_expression *psce = | |
13413 | static_cast<const Struct_construction_expression*>(this); | |
13414 | return !psce->is_constant_struct(); | |
13415 | } | |
13416 | case EXPRESSION_FIXED_ARRAY_CONSTRUCTION: | |
13417 | { | |
13418 | const Fixed_array_construction_expression *pace = | |
13419 | static_cast<const Fixed_array_construction_expression*>(this); | |
13420 | return !pace->is_constant_array(); | |
13421 | } | |
2c809f8f | 13422 | case EXPRESSION_SLICE_CONSTRUCTION: |
e440a328 | 13423 | { |
2c809f8f | 13424 | const Slice_construction_expression *pace = |
13425 | static_cast<const Slice_construction_expression*>(this); | |
e440a328 | 13426 | return !pace->is_constant_array(); |
13427 | } | |
13428 | case EXPRESSION_MAP_CONSTRUCTION: | |
13429 | return true; | |
13430 | default: | |
13431 | return false; | |
13432 | } | |
13433 | } | |
13434 | ||
35a54f17 | 13435 | // Return true if this is a variable or temporary_variable. |
13436 | ||
13437 | bool | |
13438 | Expression::is_variable() const | |
13439 | { | |
13440 | switch (this->classification_) | |
13441 | { | |
13442 | case EXPRESSION_VAR_REFERENCE: | |
13443 | case EXPRESSION_TEMPORARY_REFERENCE: | |
13444 | case EXPRESSION_SET_AND_USE_TEMPORARY: | |
13445 | return true; | |
13446 | default: | |
13447 | return false; | |
13448 | } | |
13449 | } | |
13450 | ||
e440a328 | 13451 | // Return true if this is a reference to a local variable. |
13452 | ||
13453 | bool | |
13454 | Expression::is_local_variable() const | |
13455 | { | |
13456 | const Var_expression* ve = this->var_expression(); | |
13457 | if (ve == NULL) | |
13458 | return false; | |
13459 | const Named_object* no = ve->named_object(); | |
13460 | return (no->is_result_variable() | |
13461 | || (no->is_variable() && !no->var_value()->is_global())); | |
13462 | } | |
13463 | ||
13464 | // Class Type_guard_expression. | |
13465 | ||
13466 | // Traversal. | |
13467 | ||
13468 | int | |
13469 | Type_guard_expression::do_traverse(Traverse* traverse) | |
13470 | { | |
13471 | if (Expression::traverse(&this->expr_, traverse) == TRAVERSE_EXIT | |
13472 | || Type::traverse(this->type_, traverse) == TRAVERSE_EXIT) | |
13473 | return TRAVERSE_EXIT; | |
13474 | return TRAVERSE_CONTINUE; | |
13475 | } | |
13476 | ||
2c809f8f | 13477 | Expression* |
13478 | Type_guard_expression::do_flatten(Gogo*, Named_object*, | |
13479 | Statement_inserter* inserter) | |
13480 | { | |
13481 | if (!this->expr_->is_variable()) | |
13482 | { | |
13483 | Temporary_statement* temp = Statement::make_temporary(NULL, this->expr_, | |
13484 | this->location()); | |
13485 | inserter->insert(temp); | |
13486 | this->expr_ = | |
13487 | Expression::make_temporary_reference(temp, this->location()); | |
13488 | } | |
13489 | return this; | |
13490 | } | |
13491 | ||
e440a328 | 13492 | // Check types of a type guard expression. The expression must have |
13493 | // an interface type, but the actual type conversion is checked at run | |
13494 | // time. | |
13495 | ||
13496 | void | |
13497 | Type_guard_expression::do_check_types(Gogo*) | |
13498 | { | |
e440a328 | 13499 | Type* expr_type = this->expr_->type(); |
7e9da23f | 13500 | if (expr_type->interface_type() == NULL) |
f725ade8 | 13501 | { |
5c13bd80 | 13502 | if (!expr_type->is_error() && !this->type_->is_error()) |
f725ade8 | 13503 | this->report_error(_("type assertion only valid for interface types")); |
13504 | this->set_is_error(); | |
13505 | } | |
e440a328 | 13506 | else if (this->type_->interface_type() == NULL) |
13507 | { | |
13508 | std::string reason; | |
13509 | if (!expr_type->interface_type()->implements_interface(this->type_, | |
13510 | &reason)) | |
13511 | { | |
5c13bd80 | 13512 | if (!this->type_->is_error()) |
e440a328 | 13513 | { |
f725ade8 | 13514 | if (reason.empty()) |
13515 | this->report_error(_("impossible type assertion: " | |
13516 | "type does not implement interface")); | |
13517 | else | |
13518 | error_at(this->location(), | |
13519 | ("impossible type assertion: " | |
13520 | "type does not implement interface (%s)"), | |
13521 | reason.c_str()); | |
e440a328 | 13522 | } |
f725ade8 | 13523 | this->set_is_error(); |
e440a328 | 13524 | } |
13525 | } | |
13526 | } | |
13527 | ||
ea664253 | 13528 | // Return the backend representation for a type guard expression. |
e440a328 | 13529 | |
ea664253 | 13530 | Bexpression* |
13531 | Type_guard_expression::do_get_backend(Translate_context* context) | |
e440a328 | 13532 | { |
2c809f8f | 13533 | Expression* conversion; |
7e9da23f | 13534 | if (this->type_->interface_type() != NULL) |
2c809f8f | 13535 | conversion = |
13536 | Expression::convert_interface_to_interface(this->type_, this->expr_, | |
13537 | true, this->location()); | |
e440a328 | 13538 | else |
2c809f8f | 13539 | conversion = |
13540 | Expression::convert_for_assignment(context->gogo(), this->type_, | |
13541 | this->expr_, this->location()); | |
13542 | ||
ea664253 | 13543 | return conversion->get_backend(context); |
e440a328 | 13544 | } |
13545 | ||
d751bb78 | 13546 | // Dump ast representation for a type guard expression. |
13547 | ||
13548 | void | |
2c809f8f | 13549 | Type_guard_expression::do_dump_expression(Ast_dump_context* ast_dump_context) |
d751bb78 | 13550 | const |
13551 | { | |
13552 | this->expr_->dump_expression(ast_dump_context); | |
13553 | ast_dump_context->ostream() << "."; | |
13554 | ast_dump_context->dump_type(this->type_); | |
13555 | } | |
13556 | ||
e440a328 | 13557 | // Make a type guard expression. |
13558 | ||
13559 | Expression* | |
13560 | Expression::make_type_guard(Expression* expr, Type* type, | |
b13c66cd | 13561 | Location location) |
e440a328 | 13562 | { |
13563 | return new Type_guard_expression(expr, type, location); | |
13564 | } | |
13565 | ||
2c809f8f | 13566 | // Class Heap_expression. |
e440a328 | 13567 | |
2c809f8f | 13568 | // When you take the address of an escaping expression, it is allocated |
e440a328 | 13569 | // on the heap. This class implements that. |
13570 | ||
2c809f8f | 13571 | class Heap_expression : public Expression |
e440a328 | 13572 | { |
13573 | public: | |
2c809f8f | 13574 | Heap_expression(Expression* expr, Location location) |
13575 | : Expression(EXPRESSION_HEAP, location), | |
e440a328 | 13576 | expr_(expr) |
13577 | { } | |
13578 | ||
13579 | protected: | |
13580 | int | |
13581 | do_traverse(Traverse* traverse) | |
13582 | { return Expression::traverse(&this->expr_, traverse); } | |
13583 | ||
13584 | Type* | |
13585 | do_type() | |
13586 | { return Type::make_pointer_type(this->expr_->type()); } | |
13587 | ||
13588 | void | |
13589 | do_determine_type(const Type_context*) | |
13590 | { this->expr_->determine_type_no_context(); } | |
13591 | ||
13592 | Expression* | |
13593 | do_copy() | |
13594 | { | |
2c809f8f | 13595 | return Expression::make_heap_expression(this->expr_->copy(), |
13596 | this->location()); | |
e440a328 | 13597 | } |
13598 | ||
ea664253 | 13599 | Bexpression* |
13600 | do_get_backend(Translate_context*); | |
e440a328 | 13601 | |
13602 | // We only export global objects, and the parser does not generate | |
13603 | // this in global scope. | |
13604 | void | |
13605 | do_export(Export*) const | |
c3e6f413 | 13606 | { go_unreachable(); } |
e440a328 | 13607 | |
d751bb78 | 13608 | void |
13609 | do_dump_expression(Ast_dump_context*) const; | |
13610 | ||
e440a328 | 13611 | private: |
2c809f8f | 13612 | // The expression which is being put on the heap. |
e440a328 | 13613 | Expression* expr_; |
13614 | }; | |
13615 | ||
ea664253 | 13616 | // Return the backend representation for allocating an expression on the heap. |
e440a328 | 13617 | |
ea664253 | 13618 | Bexpression* |
13619 | Heap_expression::do_get_backend(Translate_context* context) | |
e440a328 | 13620 | { |
02c19a1a | 13621 | if (this->expr_->is_error_expression() || this->expr_->type()->is_error()) |
ea664253 | 13622 | return context->backend()->error_expression(); |
2c809f8f | 13623 | |
02c19a1a | 13624 | Location loc = this->location(); |
2c809f8f | 13625 | Gogo* gogo = context->gogo(); |
02c19a1a | 13626 | Btype* btype = this->type()->get_backend(gogo); |
ea664253 | 13627 | Bexpression* space = Expression::make_allocation(this->expr_->type(), |
13628 | loc)->get_backend(context); | |
02c19a1a | 13629 | |
13630 | Bstatement* decl; | |
13631 | Named_object* fn = context->function(); | |
13632 | go_assert(fn != NULL); | |
13633 | Bfunction* fndecl = fn->func_value()->get_or_make_decl(gogo, fn); | |
13634 | Bvariable* space_temp = | |
13635 | gogo->backend()->temporary_variable(fndecl, context->bblock(), btype, | |
13636 | space, true, loc, &decl); | |
13637 | space = gogo->backend()->var_expression(space_temp, loc); | |
9b27b43c | 13638 | Btype* expr_btype = this->expr_->type()->get_backend(gogo); |
13639 | Bexpression* ref = | |
13640 | gogo->backend()->indirect_expression(expr_btype, space, true, loc); | |
02c19a1a | 13641 | |
ea664253 | 13642 | Bexpression* bexpr = this->expr_->get_backend(context); |
02c19a1a | 13643 | Bstatement* assn = gogo->backend()->assignment_statement(ref, bexpr, loc); |
13644 | decl = gogo->backend()->compound_statement(decl, assn); | |
13645 | space = gogo->backend()->var_expression(space_temp, loc); | |
ea664253 | 13646 | return gogo->backend()->compound_expression(decl, space, loc); |
e440a328 | 13647 | } |
13648 | ||
2c809f8f | 13649 | // Dump ast representation for a heap expression. |
d751bb78 | 13650 | |
13651 | void | |
2c809f8f | 13652 | Heap_expression::do_dump_expression( |
d751bb78 | 13653 | Ast_dump_context* ast_dump_context) const |
13654 | { | |
13655 | ast_dump_context->ostream() << "&("; | |
13656 | ast_dump_context->dump_expression(this->expr_); | |
13657 | ast_dump_context->ostream() << ")"; | |
13658 | } | |
13659 | ||
2c809f8f | 13660 | // Allocate an expression on the heap. |
e440a328 | 13661 | |
13662 | Expression* | |
2c809f8f | 13663 | Expression::make_heap_expression(Expression* expr, Location location) |
e440a328 | 13664 | { |
2c809f8f | 13665 | return new Heap_expression(expr, location); |
e440a328 | 13666 | } |
13667 | ||
13668 | // Class Receive_expression. | |
13669 | ||
13670 | // Return the type of a receive expression. | |
13671 | ||
13672 | Type* | |
13673 | Receive_expression::do_type() | |
13674 | { | |
13675 | Channel_type* channel_type = this->channel_->type()->channel_type(); | |
13676 | if (channel_type == NULL) | |
13677 | return Type::make_error_type(); | |
13678 | return channel_type->element_type(); | |
13679 | } | |
13680 | ||
13681 | // Check types for a receive expression. | |
13682 | ||
13683 | void | |
13684 | Receive_expression::do_check_types(Gogo*) | |
13685 | { | |
13686 | Type* type = this->channel_->type(); | |
5c13bd80 | 13687 | if (type->is_error()) |
e440a328 | 13688 | { |
13689 | this->set_is_error(); | |
13690 | return; | |
13691 | } | |
13692 | if (type->channel_type() == NULL) | |
13693 | { | |
13694 | this->report_error(_("expected channel")); | |
13695 | return; | |
13696 | } | |
13697 | if (!type->channel_type()->may_receive()) | |
13698 | { | |
13699 | this->report_error(_("invalid receive on send-only channel")); | |
13700 | return; | |
13701 | } | |
13702 | } | |
13703 | ||
2c809f8f | 13704 | // Flattening for receive expressions creates a temporary variable to store |
13705 | // received data in for receives. | |
13706 | ||
13707 | Expression* | |
13708 | Receive_expression::do_flatten(Gogo*, Named_object*, | |
13709 | Statement_inserter* inserter) | |
13710 | { | |
13711 | Channel_type* channel_type = this->channel_->type()->channel_type(); | |
13712 | if (channel_type == NULL) | |
13713 | { | |
13714 | go_assert(saw_errors()); | |
13715 | return this; | |
13716 | } | |
13717 | ||
13718 | Type* element_type = channel_type->element_type(); | |
13719 | if (this->temp_receiver_ == NULL) | |
13720 | { | |
13721 | this->temp_receiver_ = Statement::make_temporary(element_type, NULL, | |
13722 | this->location()); | |
13723 | this->temp_receiver_->set_is_address_taken(); | |
13724 | inserter->insert(this->temp_receiver_); | |
13725 | } | |
13726 | ||
13727 | return this; | |
13728 | } | |
13729 | ||
ea664253 | 13730 | // Get the backend representation for a receive expression. |
e440a328 | 13731 | |
ea664253 | 13732 | Bexpression* |
13733 | Receive_expression::do_get_backend(Translate_context* context) | |
e440a328 | 13734 | { |
f24f10bb | 13735 | Location loc = this->location(); |
13736 | ||
e440a328 | 13737 | Channel_type* channel_type = this->channel_->type()->channel_type(); |
5b8368f4 | 13738 | if (channel_type == NULL) |
13739 | { | |
c484d925 | 13740 | go_assert(this->channel_->type()->is_error()); |
ea664253 | 13741 | return context->backend()->error_expression(); |
5b8368f4 | 13742 | } |
f24f10bb | 13743 | Expression* td = Expression::make_type_descriptor(channel_type, loc); |
e440a328 | 13744 | |
2c809f8f | 13745 | Expression* recv_ref = |
13746 | Expression::make_temporary_reference(this->temp_receiver_, loc); | |
13747 | Expression* recv_addr = | |
13748 | Expression::make_temporary_reference(this->temp_receiver_, loc); | |
13749 | recv_addr = Expression::make_unary(OPERATOR_AND, recv_addr, loc); | |
13750 | Expression* recv = | |
13751 | Runtime::make_call(Runtime::RECEIVE, loc, 3, | |
13752 | td, this->channel_, recv_addr); | |
ea664253 | 13753 | return Expression::make_compound(recv, recv_ref, loc)->get_backend(context); |
e440a328 | 13754 | } |
13755 | ||
d751bb78 | 13756 | // Dump ast representation for a receive expression. |
13757 | ||
13758 | void | |
13759 | Receive_expression::do_dump_expression(Ast_dump_context* ast_dump_context) const | |
13760 | { | |
13761 | ast_dump_context->ostream() << " <- " ; | |
13762 | ast_dump_context->dump_expression(channel_); | |
13763 | } | |
13764 | ||
e440a328 | 13765 | // Make a receive expression. |
13766 | ||
13767 | Receive_expression* | |
b13c66cd | 13768 | Expression::make_receive(Expression* channel, Location location) |
e440a328 | 13769 | { |
13770 | return new Receive_expression(channel, location); | |
13771 | } | |
13772 | ||
e440a328 | 13773 | // An expression which evaluates to a pointer to the type descriptor |
13774 | // of a type. | |
13775 | ||
13776 | class Type_descriptor_expression : public Expression | |
13777 | { | |
13778 | public: | |
b13c66cd | 13779 | Type_descriptor_expression(Type* type, Location location) |
e440a328 | 13780 | : Expression(EXPRESSION_TYPE_DESCRIPTOR, location), |
13781 | type_(type) | |
13782 | { } | |
13783 | ||
13784 | protected: | |
4b686186 | 13785 | int |
13786 | do_traverse(Traverse*); | |
13787 | ||
e440a328 | 13788 | Type* |
13789 | do_type() | |
13790 | { return Type::make_type_descriptor_ptr_type(); } | |
13791 | ||
f9ca30f9 | 13792 | bool |
13793 | do_is_immutable() const | |
13794 | { return true; } | |
13795 | ||
e440a328 | 13796 | void |
13797 | do_determine_type(const Type_context*) | |
13798 | { } | |
13799 | ||
13800 | Expression* | |
13801 | do_copy() | |
13802 | { return this; } | |
13803 | ||
ea664253 | 13804 | Bexpression* |
13805 | do_get_backend(Translate_context* context) | |
a1d23b41 | 13806 | { |
ea664253 | 13807 | return this->type_->type_descriptor_pointer(context->gogo(), |
13808 | this->location()); | |
a1d23b41 | 13809 | } |
e440a328 | 13810 | |
d751bb78 | 13811 | void |
13812 | do_dump_expression(Ast_dump_context*) const; | |
13813 | ||
e440a328 | 13814 | private: |
13815 | // The type for which this is the descriptor. | |
13816 | Type* type_; | |
13817 | }; | |
13818 | ||
4b686186 | 13819 | int |
13820 | Type_descriptor_expression::do_traverse(Traverse* traverse) | |
13821 | { | |
13822 | if (Type::traverse(this->type_, traverse) == TRAVERSE_EXIT) | |
13823 | return TRAVERSE_EXIT; | |
13824 | return TRAVERSE_CONTINUE; | |
13825 | } | |
13826 | ||
d751bb78 | 13827 | // Dump ast representation for a type descriptor expression. |
13828 | ||
13829 | void | |
13830 | Type_descriptor_expression::do_dump_expression( | |
13831 | Ast_dump_context* ast_dump_context) const | |
13832 | { | |
13833 | ast_dump_context->dump_type(this->type_); | |
13834 | } | |
13835 | ||
e440a328 | 13836 | // Make a type descriptor expression. |
13837 | ||
13838 | Expression* | |
b13c66cd | 13839 | Expression::make_type_descriptor(Type* type, Location location) |
e440a328 | 13840 | { |
13841 | return new Type_descriptor_expression(type, location); | |
13842 | } | |
13843 | ||
aa5ae575 | 13844 | // An expression which evaluates to a pointer to the Garbage Collection symbol |
13845 | // of a type. | |
13846 | ||
13847 | class GC_symbol_expression : public Expression | |
13848 | { | |
13849 | public: | |
13850 | GC_symbol_expression(Type* type) | |
13851 | : Expression(EXPRESSION_GC_SYMBOL, Linemap::predeclared_location()), | |
13852 | type_(type) | |
13853 | {} | |
13854 | ||
13855 | protected: | |
13856 | Type* | |
13857 | do_type() | |
23d77f91 | 13858 | { return Type::lookup_integer_type("uintptr"); } |
aa5ae575 | 13859 | |
13860 | bool | |
13861 | do_is_immutable() const | |
13862 | { return true; } | |
13863 | ||
13864 | void | |
13865 | do_determine_type(const Type_context*) | |
13866 | { } | |
13867 | ||
13868 | Expression* | |
13869 | do_copy() | |
13870 | { return this; } | |
13871 | ||
13872 | Bexpression* | |
13873 | do_get_backend(Translate_context* context) | |
13874 | { return this->type_->gc_symbol_pointer(context->gogo()); } | |
13875 | ||
13876 | void | |
13877 | do_dump_expression(Ast_dump_context*) const; | |
13878 | ||
13879 | private: | |
13880 | // The type which this gc symbol describes. | |
13881 | Type* type_; | |
13882 | }; | |
13883 | ||
13884 | // Dump ast representation for a gc symbol expression. | |
13885 | ||
13886 | void | |
13887 | GC_symbol_expression::do_dump_expression( | |
13888 | Ast_dump_context* ast_dump_context) const | |
13889 | { | |
13890 | ast_dump_context->ostream() << "gcdata("; | |
13891 | ast_dump_context->dump_type(this->type_); | |
13892 | ast_dump_context->ostream() << ")"; | |
13893 | } | |
13894 | ||
13895 | // Make a gc symbol expression. | |
13896 | ||
13897 | Expression* | |
13898 | Expression::make_gc_symbol(Type* type) | |
13899 | { | |
13900 | return new GC_symbol_expression(type); | |
13901 | } | |
13902 | ||
e440a328 | 13903 | // An expression which evaluates to some characteristic of a type. |
13904 | // This is only used to initialize fields of a type descriptor. Using | |
13905 | // a new expression class is slightly inefficient but gives us a good | |
13906 | // separation between the frontend and the middle-end with regard to | |
13907 | // how types are laid out. | |
13908 | ||
13909 | class Type_info_expression : public Expression | |
13910 | { | |
13911 | public: | |
13912 | Type_info_expression(Type* type, Type_info type_info) | |
b13c66cd | 13913 | : Expression(EXPRESSION_TYPE_INFO, Linemap::predeclared_location()), |
e440a328 | 13914 | type_(type), type_info_(type_info) |
13915 | { } | |
13916 | ||
13917 | protected: | |
0e168074 | 13918 | bool |
13919 | do_is_immutable() const | |
13920 | { return true; } | |
13921 | ||
e440a328 | 13922 | Type* |
13923 | do_type(); | |
13924 | ||
13925 | void | |
13926 | do_determine_type(const Type_context*) | |
13927 | { } | |
13928 | ||
13929 | Expression* | |
13930 | do_copy() | |
13931 | { return this; } | |
13932 | ||
ea664253 | 13933 | Bexpression* |
13934 | do_get_backend(Translate_context* context); | |
e440a328 | 13935 | |
d751bb78 | 13936 | void |
13937 | do_dump_expression(Ast_dump_context*) const; | |
13938 | ||
e440a328 | 13939 | private: |
13940 | // The type for which we are getting information. | |
13941 | Type* type_; | |
13942 | // What information we want. | |
13943 | Type_info type_info_; | |
13944 | }; | |
13945 | ||
13946 | // The type is chosen to match what the type descriptor struct | |
13947 | // expects. | |
13948 | ||
13949 | Type* | |
13950 | Type_info_expression::do_type() | |
13951 | { | |
13952 | switch (this->type_info_) | |
13953 | { | |
13954 | case TYPE_INFO_SIZE: | |
13955 | return Type::lookup_integer_type("uintptr"); | |
13956 | case TYPE_INFO_ALIGNMENT: | |
13957 | case TYPE_INFO_FIELD_ALIGNMENT: | |
13958 | return Type::lookup_integer_type("uint8"); | |
13959 | default: | |
c3e6f413 | 13960 | go_unreachable(); |
e440a328 | 13961 | } |
13962 | } | |
13963 | ||
ea664253 | 13964 | // Return the backend representation for type information. |
e440a328 | 13965 | |
ea664253 | 13966 | Bexpression* |
13967 | Type_info_expression::do_get_backend(Translate_context* context) | |
e440a328 | 13968 | { |
927a01eb | 13969 | Btype* btype = this->type_->get_backend(context->gogo()); |
13970 | Gogo* gogo = context->gogo(); | |
13971 | size_t val; | |
13972 | switch (this->type_info_) | |
e440a328 | 13973 | { |
927a01eb | 13974 | case TYPE_INFO_SIZE: |
13975 | val = gogo->backend()->type_size(btype); | |
13976 | break; | |
13977 | case TYPE_INFO_ALIGNMENT: | |
13978 | val = gogo->backend()->type_alignment(btype); | |
13979 | break; | |
13980 | case TYPE_INFO_FIELD_ALIGNMENT: | |
13981 | val = gogo->backend()->type_field_alignment(btype); | |
13982 | break; | |
13983 | default: | |
13984 | go_unreachable(); | |
e440a328 | 13985 | } |
287cdcf4 | 13986 | mpz_t cst; |
13987 | mpz_init_set_ui(cst, val); | |
13988 | Btype* int_btype = this->type()->get_backend(gogo); | |
13989 | Bexpression* ret = | |
13990 | gogo->backend()->integer_constant_expression(int_btype, cst); | |
13991 | mpz_clear(cst); | |
ea664253 | 13992 | return ret; |
e440a328 | 13993 | } |
13994 | ||
d751bb78 | 13995 | // Dump ast representation for a type info expression. |
13996 | ||
13997 | void | |
13998 | Type_info_expression::do_dump_expression( | |
13999 | Ast_dump_context* ast_dump_context) const | |
14000 | { | |
14001 | ast_dump_context->ostream() << "typeinfo("; | |
14002 | ast_dump_context->dump_type(this->type_); | |
14003 | ast_dump_context->ostream() << ","; | |
14004 | ast_dump_context->ostream() << | |
14005 | (this->type_info_ == TYPE_INFO_ALIGNMENT ? "alignment" | |
14006 | : this->type_info_ == TYPE_INFO_FIELD_ALIGNMENT ? "field alignment" | |
14007 | : this->type_info_ == TYPE_INFO_SIZE ? "size " | |
14008 | : "unknown"); | |
14009 | ast_dump_context->ostream() << ")"; | |
14010 | } | |
14011 | ||
e440a328 | 14012 | // Make a type info expression. |
14013 | ||
14014 | Expression* | |
14015 | Expression::make_type_info(Type* type, Type_info type_info) | |
14016 | { | |
14017 | return new Type_info_expression(type, type_info); | |
14018 | } | |
14019 | ||
35a54f17 | 14020 | // An expression that evaluates to some characteristic of a slice. |
14021 | // This is used when indexing, bound-checking, or nil checking a slice. | |
14022 | ||
14023 | class Slice_info_expression : public Expression | |
14024 | { | |
14025 | public: | |
14026 | Slice_info_expression(Expression* slice, Slice_info slice_info, | |
14027 | Location location) | |
14028 | : Expression(EXPRESSION_SLICE_INFO, location), | |
14029 | slice_(slice), slice_info_(slice_info) | |
14030 | { } | |
14031 | ||
14032 | protected: | |
14033 | Type* | |
14034 | do_type(); | |
14035 | ||
14036 | void | |
14037 | do_determine_type(const Type_context*) | |
14038 | { } | |
14039 | ||
14040 | Expression* | |
14041 | do_copy() | |
14042 | { | |
14043 | return new Slice_info_expression(this->slice_->copy(), this->slice_info_, | |
14044 | this->location()); | |
14045 | } | |
14046 | ||
ea664253 | 14047 | Bexpression* |
14048 | do_get_backend(Translate_context* context); | |
35a54f17 | 14049 | |
14050 | void | |
14051 | do_dump_expression(Ast_dump_context*) const; | |
14052 | ||
14053 | void | |
14054 | do_issue_nil_check() | |
14055 | { this->slice_->issue_nil_check(); } | |
14056 | ||
14057 | private: | |
14058 | // The slice for which we are getting information. | |
14059 | Expression* slice_; | |
14060 | // What information we want. | |
14061 | Slice_info slice_info_; | |
14062 | }; | |
14063 | ||
14064 | // Return the type of the slice info. | |
14065 | ||
14066 | Type* | |
14067 | Slice_info_expression::do_type() | |
14068 | { | |
14069 | switch (this->slice_info_) | |
14070 | { | |
14071 | case SLICE_INFO_VALUE_POINTER: | |
14072 | return Type::make_pointer_type( | |
14073 | this->slice_->type()->array_type()->element_type()); | |
14074 | case SLICE_INFO_LENGTH: | |
14075 | case SLICE_INFO_CAPACITY: | |
14076 | return Type::lookup_integer_type("int"); | |
14077 | default: | |
14078 | go_unreachable(); | |
14079 | } | |
14080 | } | |
14081 | ||
ea664253 | 14082 | // Return the backend information for slice information. |
35a54f17 | 14083 | |
ea664253 | 14084 | Bexpression* |
14085 | Slice_info_expression::do_get_backend(Translate_context* context) | |
35a54f17 | 14086 | { |
14087 | Gogo* gogo = context->gogo(); | |
ea664253 | 14088 | Bexpression* bslice = this->slice_->get_backend(context); |
35a54f17 | 14089 | switch (this->slice_info_) |
14090 | { | |
14091 | case SLICE_INFO_VALUE_POINTER: | |
14092 | case SLICE_INFO_LENGTH: | |
14093 | case SLICE_INFO_CAPACITY: | |
ea664253 | 14094 | return gogo->backend()->struct_field_expression(bslice, this->slice_info_, |
14095 | this->location()); | |
35a54f17 | 14096 | break; |
14097 | default: | |
14098 | go_unreachable(); | |
14099 | } | |
35a54f17 | 14100 | } |
14101 | ||
14102 | // Dump ast representation for a type info expression. | |
14103 | ||
14104 | void | |
14105 | Slice_info_expression::do_dump_expression( | |
14106 | Ast_dump_context* ast_dump_context) const | |
14107 | { | |
14108 | ast_dump_context->ostream() << "sliceinfo("; | |
14109 | this->slice_->dump_expression(ast_dump_context); | |
14110 | ast_dump_context->ostream() << ","; | |
14111 | ast_dump_context->ostream() << | |
14112 | (this->slice_info_ == SLICE_INFO_VALUE_POINTER ? "values" | |
14113 | : this->slice_info_ == SLICE_INFO_LENGTH ? "length" | |
14114 | : this->slice_info_ == SLICE_INFO_CAPACITY ? "capacity " | |
14115 | : "unknown"); | |
14116 | ast_dump_context->ostream() << ")"; | |
14117 | } | |
14118 | ||
14119 | // Make a slice info expression. | |
14120 | ||
14121 | Expression* | |
14122 | Expression::make_slice_info(Expression* slice, Slice_info slice_info, | |
14123 | Location location) | |
14124 | { | |
14125 | return new Slice_info_expression(slice, slice_info, location); | |
14126 | } | |
14127 | ||
2c809f8f | 14128 | // An expression that represents a slice value: a struct with value pointer, |
14129 | // length, and capacity fields. | |
14130 | ||
14131 | class Slice_value_expression : public Expression | |
14132 | { | |
14133 | public: | |
14134 | Slice_value_expression(Type* type, Expression* valptr, Expression* len, | |
14135 | Expression* cap, Location location) | |
14136 | : Expression(EXPRESSION_SLICE_VALUE, location), | |
14137 | type_(type), valptr_(valptr), len_(len), cap_(cap) | |
14138 | { } | |
14139 | ||
14140 | protected: | |
14141 | int | |
14142 | do_traverse(Traverse*); | |
14143 | ||
14144 | Type* | |
14145 | do_type() | |
14146 | { return this->type_; } | |
14147 | ||
14148 | void | |
14149 | do_determine_type(const Type_context*) | |
14150 | { go_unreachable(); } | |
14151 | ||
14152 | Expression* | |
14153 | do_copy() | |
14154 | { | |
14155 | return new Slice_value_expression(this->type_, this->valptr_->copy(), | |
14156 | this->len_->copy(), this->cap_->copy(), | |
14157 | this->location()); | |
14158 | } | |
14159 | ||
ea664253 | 14160 | Bexpression* |
14161 | do_get_backend(Translate_context* context); | |
2c809f8f | 14162 | |
14163 | void | |
14164 | do_dump_expression(Ast_dump_context*) const; | |
14165 | ||
14166 | private: | |
14167 | // The type of the slice value. | |
14168 | Type* type_; | |
14169 | // The pointer to the values in the slice. | |
14170 | Expression* valptr_; | |
14171 | // The length of the slice. | |
14172 | Expression* len_; | |
14173 | // The capacity of the slice. | |
14174 | Expression* cap_; | |
14175 | }; | |
14176 | ||
14177 | int | |
14178 | Slice_value_expression::do_traverse(Traverse* traverse) | |
14179 | { | |
55e8ba6a | 14180 | if (Type::traverse(this->type_, traverse) == TRAVERSE_EXIT |
14181 | || Expression::traverse(&this->valptr_, traverse) == TRAVERSE_EXIT | |
2c809f8f | 14182 | || Expression::traverse(&this->len_, traverse) == TRAVERSE_EXIT |
14183 | || Expression::traverse(&this->cap_, traverse) == TRAVERSE_EXIT) | |
14184 | return TRAVERSE_EXIT; | |
14185 | return TRAVERSE_CONTINUE; | |
14186 | } | |
14187 | ||
ea664253 | 14188 | Bexpression* |
14189 | Slice_value_expression::do_get_backend(Translate_context* context) | |
2c809f8f | 14190 | { |
14191 | std::vector<Bexpression*> vals(3); | |
ea664253 | 14192 | vals[0] = this->valptr_->get_backend(context); |
14193 | vals[1] = this->len_->get_backend(context); | |
14194 | vals[2] = this->cap_->get_backend(context); | |
2c809f8f | 14195 | |
14196 | Gogo* gogo = context->gogo(); | |
14197 | Btype* btype = this->type_->get_backend(gogo); | |
ea664253 | 14198 | return gogo->backend()->constructor_expression(btype, vals, this->location()); |
2c809f8f | 14199 | } |
14200 | ||
14201 | void | |
14202 | Slice_value_expression::do_dump_expression( | |
14203 | Ast_dump_context* ast_dump_context) const | |
14204 | { | |
14205 | ast_dump_context->ostream() << "slicevalue("; | |
14206 | ast_dump_context->ostream() << "values: "; | |
14207 | this->valptr_->dump_expression(ast_dump_context); | |
14208 | ast_dump_context->ostream() << ", length: "; | |
14209 | this->len_->dump_expression(ast_dump_context); | |
14210 | ast_dump_context->ostream() << ", capacity: "; | |
14211 | this->cap_->dump_expression(ast_dump_context); | |
14212 | ast_dump_context->ostream() << ")"; | |
14213 | } | |
14214 | ||
14215 | Expression* | |
14216 | Expression::make_slice_value(Type* at, Expression* valptr, Expression* len, | |
14217 | Expression* cap, Location location) | |
14218 | { | |
14219 | go_assert(at->is_slice_type()); | |
14220 | return new Slice_value_expression(at, valptr, len, cap, location); | |
14221 | } | |
2387f644 | 14222 | |
14223 | // An expression that evaluates to some characteristic of a non-empty interface. | |
14224 | // This is used to access the method table or underlying object of an interface. | |
14225 | ||
14226 | class Interface_info_expression : public Expression | |
14227 | { | |
14228 | public: | |
14229 | Interface_info_expression(Expression* iface, Interface_info iface_info, | |
2c809f8f | 14230 | Location location) |
2387f644 | 14231 | : Expression(EXPRESSION_INTERFACE_INFO, location), |
14232 | iface_(iface), iface_info_(iface_info) | |
14233 | { } | |
14234 | ||
14235 | protected: | |
14236 | Type* | |
14237 | do_type(); | |
14238 | ||
14239 | void | |
14240 | do_determine_type(const Type_context*) | |
14241 | { } | |
14242 | ||
14243 | Expression* | |
14244 | do_copy() | |
14245 | { | |
14246 | return new Interface_info_expression(this->iface_->copy(), | |
14247 | this->iface_info_, this->location()); | |
14248 | } | |
14249 | ||
ea664253 | 14250 | Bexpression* |
14251 | do_get_backend(Translate_context* context); | |
2387f644 | 14252 | |
14253 | void | |
14254 | do_dump_expression(Ast_dump_context*) const; | |
14255 | ||
14256 | void | |
14257 | do_issue_nil_check() | |
14258 | { this->iface_->issue_nil_check(); } | |
14259 | ||
14260 | private: | |
14261 | // The interface for which we are getting information. | |
14262 | Expression* iface_; | |
14263 | // What information we want. | |
14264 | Interface_info iface_info_; | |
14265 | }; | |
14266 | ||
14267 | // Return the type of the interface info. | |
14268 | ||
14269 | Type* | |
14270 | Interface_info_expression::do_type() | |
14271 | { | |
14272 | switch (this->iface_info_) | |
14273 | { | |
14274 | case INTERFACE_INFO_METHODS: | |
14275 | { | |
2c809f8f | 14276 | Type* pdt = Type::make_type_descriptor_ptr_type(); |
14277 | if (this->iface_->type()->interface_type()->is_empty()) | |
14278 | return pdt; | |
14279 | ||
2387f644 | 14280 | Location loc = this->location(); |
14281 | Struct_field_list* sfl = new Struct_field_list(); | |
2387f644 | 14282 | sfl->push_back( |
14283 | Struct_field(Typed_identifier("__type_descriptor", pdt, loc))); | |
14284 | ||
14285 | Interface_type* itype = this->iface_->type()->interface_type(); | |
14286 | for (Typed_identifier_list::const_iterator p = itype->methods()->begin(); | |
14287 | p != itype->methods()->end(); | |
14288 | ++p) | |
14289 | { | |
14290 | Function_type* ft = p->type()->function_type(); | |
14291 | go_assert(ft->receiver() == NULL); | |
14292 | ||
14293 | const Typed_identifier_list* params = ft->parameters(); | |
14294 | Typed_identifier_list* mparams = new Typed_identifier_list(); | |
14295 | if (params != NULL) | |
14296 | mparams->reserve(params->size() + 1); | |
14297 | Type* vt = Type::make_pointer_type(Type::make_void_type()); | |
14298 | mparams->push_back(Typed_identifier("", vt, ft->location())); | |
14299 | if (params != NULL) | |
14300 | { | |
14301 | for (Typed_identifier_list::const_iterator pp = params->begin(); | |
14302 | pp != params->end(); | |
14303 | ++pp) | |
14304 | mparams->push_back(*pp); | |
14305 | } | |
14306 | ||
14307 | Typed_identifier_list* mresults = (ft->results() == NULL | |
14308 | ? NULL | |
14309 | : ft->results()->copy()); | |
14310 | Backend_function_type* mft = | |
14311 | Type::make_backend_function_type(NULL, mparams, mresults, | |
14312 | ft->location()); | |
14313 | ||
14314 | std::string fname = Gogo::unpack_hidden_name(p->name()); | |
14315 | sfl->push_back(Struct_field(Typed_identifier(fname, mft, loc))); | |
14316 | } | |
14317 | ||
14318 | return Type::make_pointer_type(Type::make_struct_type(sfl, loc)); | |
14319 | } | |
14320 | case INTERFACE_INFO_OBJECT: | |
14321 | return Type::make_pointer_type(Type::make_void_type()); | |
14322 | default: | |
14323 | go_unreachable(); | |
14324 | } | |
14325 | } | |
14326 | ||
ea664253 | 14327 | // Return the backend representation for interface information. |
2387f644 | 14328 | |
ea664253 | 14329 | Bexpression* |
14330 | Interface_info_expression::do_get_backend(Translate_context* context) | |
2387f644 | 14331 | { |
14332 | Gogo* gogo = context->gogo(); | |
ea664253 | 14333 | Bexpression* biface = this->iface_->get_backend(context); |
2387f644 | 14334 | switch (this->iface_info_) |
14335 | { | |
14336 | case INTERFACE_INFO_METHODS: | |
14337 | case INTERFACE_INFO_OBJECT: | |
ea664253 | 14338 | return gogo->backend()->struct_field_expression(biface, this->iface_info_, |
14339 | this->location()); | |
2387f644 | 14340 | break; |
14341 | default: | |
14342 | go_unreachable(); | |
14343 | } | |
2387f644 | 14344 | } |
14345 | ||
14346 | // Dump ast representation for an interface info expression. | |
14347 | ||
14348 | void | |
14349 | Interface_info_expression::do_dump_expression( | |
14350 | Ast_dump_context* ast_dump_context) const | |
14351 | { | |
2c809f8f | 14352 | bool is_empty = this->iface_->type()->interface_type()->is_empty(); |
2387f644 | 14353 | ast_dump_context->ostream() << "interfaceinfo("; |
14354 | this->iface_->dump_expression(ast_dump_context); | |
14355 | ast_dump_context->ostream() << ","; | |
14356 | ast_dump_context->ostream() << | |
2c809f8f | 14357 | (this->iface_info_ == INTERFACE_INFO_METHODS && !is_empty ? "methods" |
14358 | : this->iface_info_ == INTERFACE_INFO_TYPE_DESCRIPTOR ? "type_descriptor" | |
2387f644 | 14359 | : this->iface_info_ == INTERFACE_INFO_OBJECT ? "object" |
14360 | : "unknown"); | |
14361 | ast_dump_context->ostream() << ")"; | |
14362 | } | |
14363 | ||
14364 | // Make an interface info expression. | |
14365 | ||
14366 | Expression* | |
14367 | Expression::make_interface_info(Expression* iface, Interface_info iface_info, | |
14368 | Location location) | |
14369 | { | |
14370 | return new Interface_info_expression(iface, iface_info, location); | |
14371 | } | |
14372 | ||
2c809f8f | 14373 | // An expression that represents an interface value. The first field is either |
14374 | // a type descriptor for an empty interface or a pointer to the interface method | |
14375 | // table for a non-empty interface. The second field is always the object. | |
14376 | ||
14377 | class Interface_value_expression : public Expression | |
14378 | { | |
14379 | public: | |
14380 | Interface_value_expression(Type* type, Expression* first_field, | |
14381 | Expression* obj, Location location) | |
14382 | : Expression(EXPRESSION_INTERFACE_VALUE, location), | |
14383 | type_(type), first_field_(first_field), obj_(obj) | |
14384 | { } | |
14385 | ||
14386 | protected: | |
14387 | int | |
14388 | do_traverse(Traverse*); | |
14389 | ||
14390 | Type* | |
14391 | do_type() | |
14392 | { return this->type_; } | |
14393 | ||
14394 | void | |
14395 | do_determine_type(const Type_context*) | |
14396 | { go_unreachable(); } | |
14397 | ||
14398 | Expression* | |
14399 | do_copy() | |
14400 | { | |
14401 | return new Interface_value_expression(this->type_, | |
14402 | this->first_field_->copy(), | |
14403 | this->obj_->copy(), this->location()); | |
14404 | } | |
14405 | ||
ea664253 | 14406 | Bexpression* |
14407 | do_get_backend(Translate_context* context); | |
2c809f8f | 14408 | |
14409 | void | |
14410 | do_dump_expression(Ast_dump_context*) const; | |
14411 | ||
14412 | private: | |
14413 | // The type of the interface value. | |
14414 | Type* type_; | |
14415 | // The first field of the interface (either a type descriptor or a pointer | |
14416 | // to the method table. | |
14417 | Expression* first_field_; | |
14418 | // The underlying object of the interface. | |
14419 | Expression* obj_; | |
14420 | }; | |
14421 | ||
14422 | int | |
14423 | Interface_value_expression::do_traverse(Traverse* traverse) | |
14424 | { | |
14425 | if (Expression::traverse(&this->first_field_, traverse) == TRAVERSE_EXIT | |
14426 | || Expression::traverse(&this->obj_, traverse) == TRAVERSE_EXIT) | |
14427 | return TRAVERSE_EXIT; | |
14428 | return TRAVERSE_CONTINUE; | |
14429 | } | |
14430 | ||
ea664253 | 14431 | Bexpression* |
14432 | Interface_value_expression::do_get_backend(Translate_context* context) | |
2c809f8f | 14433 | { |
14434 | std::vector<Bexpression*> vals(2); | |
ea664253 | 14435 | vals[0] = this->first_field_->get_backend(context); |
14436 | vals[1] = this->obj_->get_backend(context); | |
2c809f8f | 14437 | |
14438 | Gogo* gogo = context->gogo(); | |
14439 | Btype* btype = this->type_->get_backend(gogo); | |
ea664253 | 14440 | return gogo->backend()->constructor_expression(btype, vals, this->location()); |
2c809f8f | 14441 | } |
14442 | ||
14443 | void | |
14444 | Interface_value_expression::do_dump_expression( | |
14445 | Ast_dump_context* ast_dump_context) const | |
14446 | { | |
14447 | ast_dump_context->ostream() << "interfacevalue("; | |
14448 | ast_dump_context->ostream() << | |
14449 | (this->type_->interface_type()->is_empty() | |
14450 | ? "type_descriptor: " | |
14451 | : "methods: "); | |
14452 | this->first_field_->dump_expression(ast_dump_context); | |
14453 | ast_dump_context->ostream() << ", object: "; | |
14454 | this->obj_->dump_expression(ast_dump_context); | |
14455 | ast_dump_context->ostream() << ")"; | |
14456 | } | |
14457 | ||
14458 | Expression* | |
14459 | Expression::make_interface_value(Type* type, Expression* first_value, | |
14460 | Expression* object, Location location) | |
14461 | { | |
14462 | return new Interface_value_expression(type, first_value, object, location); | |
14463 | } | |
14464 | ||
14465 | // An interface method table for a pair of types: an interface type and a type | |
14466 | // that implements that interface. | |
14467 | ||
14468 | class Interface_mtable_expression : public Expression | |
14469 | { | |
14470 | public: | |
14471 | Interface_mtable_expression(Interface_type* itype, Type* type, | |
14472 | bool is_pointer, Location location) | |
14473 | : Expression(EXPRESSION_INTERFACE_MTABLE, location), | |
14474 | itype_(itype), type_(type), is_pointer_(is_pointer), | |
14475 | method_table_type_(NULL), bvar_(NULL) | |
14476 | { } | |
14477 | ||
14478 | protected: | |
14479 | int | |
14480 | do_traverse(Traverse*); | |
14481 | ||
14482 | Type* | |
14483 | do_type(); | |
14484 | ||
14485 | bool | |
14486 | is_immutable() const | |
14487 | { return true; } | |
14488 | ||
14489 | void | |
14490 | do_determine_type(const Type_context*) | |
14491 | { go_unreachable(); } | |
14492 | ||
14493 | Expression* | |
14494 | do_copy() | |
14495 | { | |
14496 | return new Interface_mtable_expression(this->itype_, this->type_, | |
14497 | this->is_pointer_, this->location()); | |
14498 | } | |
14499 | ||
14500 | bool | |
14501 | do_is_addressable() const | |
14502 | { return true; } | |
14503 | ||
ea664253 | 14504 | Bexpression* |
14505 | do_get_backend(Translate_context* context); | |
2c809f8f | 14506 | |
14507 | void | |
14508 | do_dump_expression(Ast_dump_context*) const; | |
14509 | ||
14510 | private: | |
14511 | // The interface type for which the methods are defined. | |
14512 | Interface_type* itype_; | |
14513 | // The type to construct the interface method table for. | |
14514 | Type* type_; | |
14515 | // Whether this table contains the method set for the receiver type or the | |
14516 | // pointer receiver type. | |
14517 | bool is_pointer_; | |
14518 | // The type of the method table. | |
14519 | Type* method_table_type_; | |
14520 | // The backend variable that refers to the interface method table. | |
14521 | Bvariable* bvar_; | |
14522 | }; | |
14523 | ||
14524 | int | |
14525 | Interface_mtable_expression::do_traverse(Traverse* traverse) | |
14526 | { | |
14527 | if (Type::traverse(this->itype_, traverse) == TRAVERSE_EXIT | |
14528 | || Type::traverse(this->type_, traverse) == TRAVERSE_EXIT) | |
14529 | return TRAVERSE_EXIT; | |
14530 | return TRAVERSE_CONTINUE; | |
14531 | } | |
14532 | ||
14533 | Type* | |
14534 | Interface_mtable_expression::do_type() | |
14535 | { | |
14536 | if (this->method_table_type_ != NULL) | |
14537 | return this->method_table_type_; | |
14538 | ||
14539 | const Typed_identifier_list* interface_methods = this->itype_->methods(); | |
14540 | go_assert(!interface_methods->empty()); | |
14541 | ||
14542 | Struct_field_list* sfl = new Struct_field_list; | |
14543 | Typed_identifier tid("__type_descriptor", Type::make_type_descriptor_ptr_type(), | |
14544 | this->location()); | |
14545 | sfl->push_back(Struct_field(tid)); | |
14546 | for (Typed_identifier_list::const_iterator p = interface_methods->begin(); | |
14547 | p != interface_methods->end(); | |
14548 | ++p) | |
14549 | sfl->push_back(Struct_field(*p)); | |
14550 | this->method_table_type_ = Type::make_struct_type(sfl, this->location()); | |
14551 | return this->method_table_type_; | |
14552 | } | |
14553 | ||
ea664253 | 14554 | Bexpression* |
14555 | Interface_mtable_expression::do_get_backend(Translate_context* context) | |
2c809f8f | 14556 | { |
14557 | Gogo* gogo = context->gogo(); | |
2c809f8f | 14558 | Location loc = Linemap::predeclared_location(); |
14559 | if (this->bvar_ != NULL) | |
ea664253 | 14560 | return gogo->backend()->var_expression(this->bvar_, this->location()); |
2c809f8f | 14561 | |
14562 | const Typed_identifier_list* interface_methods = this->itype_->methods(); | |
14563 | go_assert(!interface_methods->empty()); | |
14564 | ||
14565 | std::string mangled_name = ((this->is_pointer_ ? "__go_pimt__" : "__go_imt_") | |
14566 | + this->itype_->mangled_name(gogo) | |
14567 | + "__" | |
14568 | + this->type_->mangled_name(gogo)); | |
14569 | ||
14570 | // See whether this interface has any hidden methods. | |
14571 | bool has_hidden_methods = false; | |
14572 | for (Typed_identifier_list::const_iterator p = interface_methods->begin(); | |
14573 | p != interface_methods->end(); | |
14574 | ++p) | |
14575 | { | |
14576 | if (Gogo::is_hidden_name(p->name())) | |
14577 | { | |
14578 | has_hidden_methods = true; | |
14579 | break; | |
14580 | } | |
14581 | } | |
14582 | ||
14583 | // We already know that the named type is convertible to the | |
14584 | // interface. If the interface has hidden methods, and the named | |
14585 | // type is defined in a different package, then the interface | |
14586 | // conversion table will be defined by that other package. | |
14587 | if (has_hidden_methods | |
14588 | && this->type_->named_type() != NULL | |
14589 | && this->type_->named_type()->named_object()->package() != NULL) | |
14590 | { | |
14591 | Btype* btype = this->type()->get_backend(gogo); | |
14592 | this->bvar_ = | |
14593 | gogo->backend()->immutable_struct_reference(mangled_name, btype, loc); | |
ea664253 | 14594 | return gogo->backend()->var_expression(this->bvar_, this->location()); |
2c809f8f | 14595 | } |
14596 | ||
14597 | // The first element is the type descriptor. | |
14598 | Type* td_type; | |
14599 | if (!this->is_pointer_) | |
14600 | td_type = this->type_; | |
14601 | else | |
14602 | td_type = Type::make_pointer_type(this->type_); | |
14603 | ||
14604 | // Build an interface method table for a type: a type descriptor followed by a | |
14605 | // list of function pointers, one for each interface method. This is used for | |
14606 | // interfaces. | |
14607 | Expression_list* svals = new Expression_list(); | |
14608 | svals->push_back(Expression::make_type_descriptor(td_type, loc)); | |
14609 | ||
14610 | Named_type* nt = this->type_->named_type(); | |
14611 | Struct_type* st = this->type_->struct_type(); | |
14612 | go_assert(nt != NULL || st != NULL); | |
14613 | ||
14614 | for (Typed_identifier_list::const_iterator p = interface_methods->begin(); | |
14615 | p != interface_methods->end(); | |
14616 | ++p) | |
14617 | { | |
14618 | bool is_ambiguous; | |
14619 | Method* m; | |
14620 | if (nt != NULL) | |
14621 | m = nt->method_function(p->name(), &is_ambiguous); | |
14622 | else | |
14623 | m = st->method_function(p->name(), &is_ambiguous); | |
14624 | go_assert(m != NULL); | |
14625 | Named_object* no = m->named_object(); | |
14626 | ||
14627 | go_assert(no->is_function() || no->is_function_declaration()); | |
14628 | svals->push_back(Expression::make_func_code_reference(no, loc)); | |
14629 | } | |
14630 | ||
14631 | Btype* btype = this->type()->get_backend(gogo); | |
14632 | Expression* mtable = Expression::make_struct_composite_literal(this->type(), | |
14633 | svals, loc); | |
ea664253 | 14634 | Bexpression* ctor = mtable->get_backend(context); |
2c809f8f | 14635 | |
14636 | bool is_public = has_hidden_methods && this->type_->named_type() != NULL; | |
14637 | this->bvar_ = gogo->backend()->immutable_struct(mangled_name, false, | |
14638 | !is_public, btype, loc); | |
14639 | gogo->backend()->immutable_struct_set_init(this->bvar_, mangled_name, false, | |
14640 | !is_public, btype, loc, ctor); | |
ea664253 | 14641 | return gogo->backend()->var_expression(this->bvar_, loc); |
2c809f8f | 14642 | } |
14643 | ||
14644 | void | |
14645 | Interface_mtable_expression::do_dump_expression( | |
14646 | Ast_dump_context* ast_dump_context) const | |
14647 | { | |
14648 | ast_dump_context->ostream() << "__go_" | |
14649 | << (this->is_pointer_ ? "pimt__" : "imt_"); | |
14650 | ast_dump_context->dump_type(this->itype_); | |
14651 | ast_dump_context->ostream() << "__"; | |
14652 | ast_dump_context->dump_type(this->type_); | |
14653 | } | |
14654 | ||
14655 | Expression* | |
14656 | Expression::make_interface_mtable_ref(Interface_type* itype, Type* type, | |
14657 | bool is_pointer, Location location) | |
14658 | { | |
14659 | return new Interface_mtable_expression(itype, type, is_pointer, location); | |
14660 | } | |
14661 | ||
e440a328 | 14662 | // An expression which evaluates to the offset of a field within a |
14663 | // struct. This, like Type_info_expression, q.v., is only used to | |
14664 | // initialize fields of a type descriptor. | |
14665 | ||
14666 | class Struct_field_offset_expression : public Expression | |
14667 | { | |
14668 | public: | |
14669 | Struct_field_offset_expression(Struct_type* type, const Struct_field* field) | |
b13c66cd | 14670 | : Expression(EXPRESSION_STRUCT_FIELD_OFFSET, |
14671 | Linemap::predeclared_location()), | |
e440a328 | 14672 | type_(type), field_(field) |
14673 | { } | |
14674 | ||
14675 | protected: | |
f23d7786 | 14676 | bool |
14677 | do_is_immutable() const | |
14678 | { return true; } | |
14679 | ||
e440a328 | 14680 | Type* |
14681 | do_type() | |
14682 | { return Type::lookup_integer_type("uintptr"); } | |
14683 | ||
14684 | void | |
14685 | do_determine_type(const Type_context*) | |
14686 | { } | |
14687 | ||
14688 | Expression* | |
14689 | do_copy() | |
14690 | { return this; } | |
14691 | ||
ea664253 | 14692 | Bexpression* |
14693 | do_get_backend(Translate_context* context); | |
e440a328 | 14694 | |
d751bb78 | 14695 | void |
14696 | do_dump_expression(Ast_dump_context*) const; | |
14697 | ||
e440a328 | 14698 | private: |
14699 | // The type of the struct. | |
14700 | Struct_type* type_; | |
14701 | // The field. | |
14702 | const Struct_field* field_; | |
14703 | }; | |
14704 | ||
ea664253 | 14705 | // Return the backend representation for a struct field offset. |
e440a328 | 14706 | |
ea664253 | 14707 | Bexpression* |
14708 | Struct_field_offset_expression::do_get_backend(Translate_context* context) | |
e440a328 | 14709 | { |
e440a328 | 14710 | const Struct_field_list* fields = this->type_->fields(); |
e440a328 | 14711 | Struct_field_list::const_iterator p; |
2c8bda43 | 14712 | unsigned i = 0; |
e440a328 | 14713 | for (p = fields->begin(); |
14714 | p != fields->end(); | |
2c8bda43 | 14715 | ++p, ++i) |
14716 | if (&*p == this->field_) | |
14717 | break; | |
c484d925 | 14718 | go_assert(&*p == this->field_); |
e440a328 | 14719 | |
2c8bda43 | 14720 | Gogo* gogo = context->gogo(); |
14721 | Btype* btype = this->type_->get_backend(gogo); | |
14722 | ||
14723 | size_t offset = gogo->backend()->type_field_offset(btype, i); | |
2c8bda43 | 14724 | Type* uptr_type = Type::lookup_integer_type("uintptr"); |
e67508fa | 14725 | Expression* ret = |
14726 | Expression::make_integer_ul(offset, uptr_type, | |
14727 | Linemap::predeclared_location()); | |
ea664253 | 14728 | return ret->get_backend(context); |
e440a328 | 14729 | } |
14730 | ||
d751bb78 | 14731 | // Dump ast representation for a struct field offset expression. |
14732 | ||
14733 | void | |
14734 | Struct_field_offset_expression::do_dump_expression( | |
14735 | Ast_dump_context* ast_dump_context) const | |
14736 | { | |
14737 | ast_dump_context->ostream() << "unsafe.Offsetof("; | |
2d29d278 | 14738 | ast_dump_context->dump_type(this->type_); |
14739 | ast_dump_context->ostream() << '.'; | |
14740 | ast_dump_context->ostream() << | |
14741 | Gogo::message_name(this->field_->field_name()); | |
d751bb78 | 14742 | ast_dump_context->ostream() << ")"; |
14743 | } | |
14744 | ||
e440a328 | 14745 | // Make an expression for a struct field offset. |
14746 | ||
14747 | Expression* | |
14748 | Expression::make_struct_field_offset(Struct_type* type, | |
14749 | const Struct_field* field) | |
14750 | { | |
14751 | return new Struct_field_offset_expression(type, field); | |
14752 | } | |
14753 | ||
a9182619 | 14754 | // An expression which evaluates to a pointer to the map descriptor of |
14755 | // a map type. | |
14756 | ||
14757 | class Map_descriptor_expression : public Expression | |
14758 | { | |
14759 | public: | |
b13c66cd | 14760 | Map_descriptor_expression(Map_type* type, Location location) |
a9182619 | 14761 | : Expression(EXPRESSION_MAP_DESCRIPTOR, location), |
14762 | type_(type) | |
14763 | { } | |
14764 | ||
14765 | protected: | |
14766 | Type* | |
14767 | do_type() | |
14768 | { return Type::make_pointer_type(Map_type::make_map_descriptor_type()); } | |
14769 | ||
14770 | void | |
14771 | do_determine_type(const Type_context*) | |
14772 | { } | |
14773 | ||
14774 | Expression* | |
14775 | do_copy() | |
14776 | { return this; } | |
14777 | ||
ea664253 | 14778 | Bexpression* |
14779 | do_get_backend(Translate_context* context) | |
a9182619 | 14780 | { |
ea664253 | 14781 | return this->type_->map_descriptor_pointer(context->gogo(), |
14782 | this->location()); | |
a9182619 | 14783 | } |
14784 | ||
d751bb78 | 14785 | void |
14786 | do_dump_expression(Ast_dump_context*) const; | |
14787 | ||
a9182619 | 14788 | private: |
14789 | // The type for which this is the descriptor. | |
14790 | Map_type* type_; | |
14791 | }; | |
14792 | ||
d751bb78 | 14793 | // Dump ast representation for a map descriptor expression. |
14794 | ||
14795 | void | |
14796 | Map_descriptor_expression::do_dump_expression( | |
14797 | Ast_dump_context* ast_dump_context) const | |
14798 | { | |
14799 | ast_dump_context->ostream() << "map_descriptor("; | |
14800 | ast_dump_context->dump_type(this->type_); | |
14801 | ast_dump_context->ostream() << ")"; | |
14802 | } | |
14803 | ||
a9182619 | 14804 | // Make a map descriptor expression. |
14805 | ||
14806 | Expression* | |
b13c66cd | 14807 | Expression::make_map_descriptor(Map_type* type, Location location) |
a9182619 | 14808 | { |
14809 | return new Map_descriptor_expression(type, location); | |
14810 | } | |
14811 | ||
e440a328 | 14812 | // An expression which evaluates to the address of an unnamed label. |
14813 | ||
14814 | class Label_addr_expression : public Expression | |
14815 | { | |
14816 | public: | |
b13c66cd | 14817 | Label_addr_expression(Label* label, Location location) |
e440a328 | 14818 | : Expression(EXPRESSION_LABEL_ADDR, location), |
14819 | label_(label) | |
14820 | { } | |
14821 | ||
14822 | protected: | |
14823 | Type* | |
14824 | do_type() | |
14825 | { return Type::make_pointer_type(Type::make_void_type()); } | |
14826 | ||
14827 | void | |
14828 | do_determine_type(const Type_context*) | |
14829 | { } | |
14830 | ||
14831 | Expression* | |
14832 | do_copy() | |
14833 | { return new Label_addr_expression(this->label_, this->location()); } | |
14834 | ||
ea664253 | 14835 | Bexpression* |
14836 | do_get_backend(Translate_context* context) | |
14837 | { return this->label_->get_addr(context, this->location()); } | |
e440a328 | 14838 | |
d751bb78 | 14839 | void |
14840 | do_dump_expression(Ast_dump_context* ast_dump_context) const | |
14841 | { ast_dump_context->ostream() << this->label_->name(); } | |
14842 | ||
e440a328 | 14843 | private: |
14844 | // The label whose address we are taking. | |
14845 | Label* label_; | |
14846 | }; | |
14847 | ||
14848 | // Make an expression for the address of an unnamed label. | |
14849 | ||
14850 | Expression* | |
b13c66cd | 14851 | Expression::make_label_addr(Label* label, Location location) |
e440a328 | 14852 | { |
14853 | return new Label_addr_expression(label, location); | |
14854 | } | |
14855 | ||
283a177b | 14856 | // Conditional expressions. |
14857 | ||
14858 | class Conditional_expression : public Expression | |
14859 | { | |
14860 | public: | |
14861 | Conditional_expression(Expression* cond, Expression* then_expr, | |
14862 | Expression* else_expr, Location location) | |
14863 | : Expression(EXPRESSION_CONDITIONAL, location), | |
14864 | cond_(cond), then_(then_expr), else_(else_expr) | |
14865 | {} | |
14866 | ||
14867 | protected: | |
2c809f8f | 14868 | int |
14869 | do_traverse(Traverse*); | |
14870 | ||
283a177b | 14871 | Type* |
14872 | do_type(); | |
14873 | ||
14874 | void | |
2c809f8f | 14875 | do_determine_type(const Type_context*); |
283a177b | 14876 | |
14877 | Expression* | |
14878 | do_copy() | |
14879 | { | |
14880 | return new Conditional_expression(this->cond_->copy(), this->then_->copy(), | |
14881 | this->else_->copy(), this->location()); | |
14882 | } | |
14883 | ||
ea664253 | 14884 | Bexpression* |
14885 | do_get_backend(Translate_context* context); | |
283a177b | 14886 | |
14887 | void | |
14888 | do_dump_expression(Ast_dump_context*) const; | |
14889 | ||
14890 | private: | |
14891 | // The condition to be checked. | |
14892 | Expression* cond_; | |
14893 | // The expression to execute if the condition is true. | |
14894 | Expression* then_; | |
14895 | // The expression to execute if the condition is false. | |
14896 | Expression* else_; | |
14897 | }; | |
14898 | ||
2c809f8f | 14899 | // Traversal. |
14900 | ||
14901 | int | |
14902 | Conditional_expression::do_traverse(Traverse* traverse) | |
14903 | { | |
14904 | if (Expression::traverse(&this->cond_, traverse) == TRAVERSE_EXIT | |
14905 | || Expression::traverse(&this->then_, traverse) == TRAVERSE_EXIT | |
14906 | || Expression::traverse(&this->else_, traverse) == TRAVERSE_EXIT) | |
14907 | return TRAVERSE_EXIT; | |
14908 | return TRAVERSE_CONTINUE; | |
14909 | } | |
14910 | ||
283a177b | 14911 | // Return the type of the conditional expression. |
14912 | ||
14913 | Type* | |
14914 | Conditional_expression::do_type() | |
14915 | { | |
14916 | Type* result_type = Type::make_void_type(); | |
2c809f8f | 14917 | if (Type::are_identical(this->then_->type(), this->else_->type(), false, |
14918 | NULL)) | |
283a177b | 14919 | result_type = this->then_->type(); |
14920 | else if (this->then_->is_nil_expression() | |
14921 | || this->else_->is_nil_expression()) | |
14922 | result_type = (!this->then_->is_nil_expression() | |
14923 | ? this->then_->type() | |
14924 | : this->else_->type()); | |
14925 | return result_type; | |
14926 | } | |
14927 | ||
2c809f8f | 14928 | // Determine type for a conditional expression. |
14929 | ||
14930 | void | |
14931 | Conditional_expression::do_determine_type(const Type_context* context) | |
14932 | { | |
14933 | this->cond_->determine_type_no_context(); | |
14934 | this->then_->determine_type(context); | |
14935 | this->else_->determine_type(context); | |
14936 | } | |
14937 | ||
283a177b | 14938 | // Get the backend representation of a conditional expression. |
14939 | ||
ea664253 | 14940 | Bexpression* |
14941 | Conditional_expression::do_get_backend(Translate_context* context) | |
283a177b | 14942 | { |
14943 | Gogo* gogo = context->gogo(); | |
14944 | Btype* result_btype = this->type()->get_backend(gogo); | |
ea664253 | 14945 | Bexpression* cond = this->cond_->get_backend(context); |
14946 | Bexpression* then = this->then_->get_backend(context); | |
14947 | Bexpression* belse = this->else_->get_backend(context); | |
14948 | return gogo->backend()->conditional_expression(result_btype, cond, then, | |
14949 | belse, this->location()); | |
283a177b | 14950 | } |
14951 | ||
14952 | // Dump ast representation of a conditional expression. | |
14953 | ||
14954 | void | |
14955 | Conditional_expression::do_dump_expression( | |
14956 | Ast_dump_context* ast_dump_context) const | |
14957 | { | |
14958 | ast_dump_context->ostream() << "("; | |
14959 | ast_dump_context->dump_expression(this->cond_); | |
14960 | ast_dump_context->ostream() << " ? "; | |
14961 | ast_dump_context->dump_expression(this->then_); | |
14962 | ast_dump_context->ostream() << " : "; | |
14963 | ast_dump_context->dump_expression(this->else_); | |
14964 | ast_dump_context->ostream() << ") "; | |
14965 | } | |
14966 | ||
14967 | // Make a conditional expression. | |
14968 | ||
14969 | Expression* | |
14970 | Expression::make_conditional(Expression* cond, Expression* then, | |
14971 | Expression* else_expr, Location location) | |
14972 | { | |
14973 | return new Conditional_expression(cond, then, else_expr, location); | |
14974 | } | |
14975 | ||
2c809f8f | 14976 | // Compound expressions. |
14977 | ||
14978 | class Compound_expression : public Expression | |
14979 | { | |
14980 | public: | |
14981 | Compound_expression(Expression* init, Expression* expr, Location location) | |
14982 | : Expression(EXPRESSION_COMPOUND, location), init_(init), expr_(expr) | |
14983 | {} | |
14984 | ||
14985 | protected: | |
14986 | int | |
14987 | do_traverse(Traverse*); | |
14988 | ||
14989 | Type* | |
14990 | do_type(); | |
14991 | ||
14992 | void | |
14993 | do_determine_type(const Type_context*); | |
14994 | ||
14995 | Expression* | |
14996 | do_copy() | |
14997 | { | |
14998 | return new Compound_expression(this->init_->copy(), this->expr_->copy(), | |
14999 | this->location()); | |
15000 | } | |
15001 | ||
ea664253 | 15002 | Bexpression* |
15003 | do_get_backend(Translate_context* context); | |
2c809f8f | 15004 | |
15005 | void | |
15006 | do_dump_expression(Ast_dump_context*) const; | |
15007 | ||
15008 | private: | |
15009 | // The expression that is evaluated first and discarded. | |
15010 | Expression* init_; | |
15011 | // The expression that is evaluated and returned. | |
15012 | Expression* expr_; | |
15013 | }; | |
15014 | ||
15015 | // Traversal. | |
15016 | ||
15017 | int | |
15018 | Compound_expression::do_traverse(Traverse* traverse) | |
15019 | { | |
15020 | if (Expression::traverse(&this->init_, traverse) == TRAVERSE_EXIT | |
15021 | || Expression::traverse(&this->expr_, traverse) == TRAVERSE_EXIT) | |
15022 | return TRAVERSE_EXIT; | |
15023 | return TRAVERSE_CONTINUE; | |
15024 | } | |
15025 | ||
15026 | // Return the type of the compound expression. | |
15027 | ||
15028 | Type* | |
15029 | Compound_expression::do_type() | |
15030 | { | |
15031 | return this->expr_->type(); | |
15032 | } | |
15033 | ||
15034 | // Determine type for a compound expression. | |
15035 | ||
15036 | void | |
15037 | Compound_expression::do_determine_type(const Type_context* context) | |
15038 | { | |
15039 | this->init_->determine_type_no_context(); | |
15040 | this->expr_->determine_type(context); | |
15041 | } | |
15042 | ||
15043 | // Get the backend representation of a compound expression. | |
15044 | ||
ea664253 | 15045 | Bexpression* |
15046 | Compound_expression::do_get_backend(Translate_context* context) | |
2c809f8f | 15047 | { |
15048 | Gogo* gogo = context->gogo(); | |
ea664253 | 15049 | Bexpression* binit = this->init_->get_backend(context); |
2c809f8f | 15050 | Bstatement* init_stmt = gogo->backend()->expression_statement(binit); |
ea664253 | 15051 | Bexpression* bexpr = this->expr_->get_backend(context); |
15052 | return gogo->backend()->compound_expression(init_stmt, bexpr, | |
15053 | this->location()); | |
2c809f8f | 15054 | } |
15055 | ||
15056 | // Dump ast representation of a conditional expression. | |
15057 | ||
15058 | void | |
15059 | Compound_expression::do_dump_expression( | |
15060 | Ast_dump_context* ast_dump_context) const | |
15061 | { | |
15062 | ast_dump_context->ostream() << "("; | |
15063 | ast_dump_context->dump_expression(this->init_); | |
15064 | ast_dump_context->ostream() << ","; | |
15065 | ast_dump_context->dump_expression(this->expr_); | |
15066 | ast_dump_context->ostream() << ") "; | |
15067 | } | |
15068 | ||
15069 | // Make a compound expression. | |
15070 | ||
15071 | Expression* | |
15072 | Expression::make_compound(Expression* init, Expression* expr, Location location) | |
15073 | { | |
15074 | return new Compound_expression(init, expr, location); | |
15075 | } | |
15076 | ||
e440a328 | 15077 | // Import an expression. This comes at the end in order to see the |
15078 | // various class definitions. | |
15079 | ||
15080 | Expression* | |
15081 | Expression::import_expression(Import* imp) | |
15082 | { | |
15083 | int c = imp->peek_char(); | |
15084 | if (imp->match_c_string("- ") | |
15085 | || imp->match_c_string("! ") | |
15086 | || imp->match_c_string("^ ")) | |
15087 | return Unary_expression::do_import(imp); | |
15088 | else if (c == '(') | |
15089 | return Binary_expression::do_import(imp); | |
15090 | else if (imp->match_c_string("true") | |
15091 | || imp->match_c_string("false")) | |
15092 | return Boolean_expression::do_import(imp); | |
15093 | else if (c == '"') | |
15094 | return String_expression::do_import(imp); | |
15095 | else if (c == '-' || (c >= '0' && c <= '9')) | |
15096 | { | |
15097 | // This handles integers, floats and complex constants. | |
15098 | return Integer_expression::do_import(imp); | |
15099 | } | |
15100 | else if (imp->match_c_string("nil")) | |
15101 | return Nil_expression::do_import(imp); | |
15102 | else if (imp->match_c_string("convert")) | |
15103 | return Type_conversion_expression::do_import(imp); | |
15104 | else | |
15105 | { | |
15106 | error_at(imp->location(), "import error: expected expression"); | |
15107 | return Expression::make_error(imp->location()); | |
15108 | } | |
15109 | } | |
15110 | ||
15111 | // Class Expression_list. | |
15112 | ||
15113 | // Traverse the list. | |
15114 | ||
15115 | int | |
15116 | Expression_list::traverse(Traverse* traverse) | |
15117 | { | |
15118 | for (Expression_list::iterator p = this->begin(); | |
15119 | p != this->end(); | |
15120 | ++p) | |
15121 | { | |
15122 | if (*p != NULL) | |
15123 | { | |
15124 | if (Expression::traverse(&*p, traverse) == TRAVERSE_EXIT) | |
15125 | return TRAVERSE_EXIT; | |
15126 | } | |
15127 | } | |
15128 | return TRAVERSE_CONTINUE; | |
15129 | } | |
15130 | ||
15131 | // Copy the list. | |
15132 | ||
15133 | Expression_list* | |
15134 | Expression_list::copy() | |
15135 | { | |
15136 | Expression_list* ret = new Expression_list(); | |
15137 | for (Expression_list::iterator p = this->begin(); | |
15138 | p != this->end(); | |
15139 | ++p) | |
15140 | { | |
15141 | if (*p == NULL) | |
15142 | ret->push_back(NULL); | |
15143 | else | |
15144 | ret->push_back((*p)->copy()); | |
15145 | } | |
15146 | return ret; | |
15147 | } | |
15148 | ||
15149 | // Return whether an expression list has an error expression. | |
15150 | ||
15151 | bool | |
15152 | Expression_list::contains_error() const | |
15153 | { | |
15154 | for (Expression_list::const_iterator p = this->begin(); | |
15155 | p != this->end(); | |
15156 | ++p) | |
15157 | if (*p != NULL && (*p)->is_error_expression()) | |
15158 | return true; | |
15159 | return false; | |
15160 | } | |
0c77715b | 15161 | |
15162 | // Class Numeric_constant. | |
15163 | ||
15164 | // Destructor. | |
15165 | ||
15166 | Numeric_constant::~Numeric_constant() | |
15167 | { | |
15168 | this->clear(); | |
15169 | } | |
15170 | ||
15171 | // Copy constructor. | |
15172 | ||
15173 | Numeric_constant::Numeric_constant(const Numeric_constant& a) | |
15174 | : classification_(a.classification_), type_(a.type_) | |
15175 | { | |
15176 | switch (a.classification_) | |
15177 | { | |
15178 | case NC_INVALID: | |
15179 | break; | |
15180 | case NC_INT: | |
15181 | case NC_RUNE: | |
15182 | mpz_init_set(this->u_.int_val, a.u_.int_val); | |
15183 | break; | |
15184 | case NC_FLOAT: | |
15185 | mpfr_init_set(this->u_.float_val, a.u_.float_val, GMP_RNDN); | |
15186 | break; | |
15187 | case NC_COMPLEX: | |
fcbea5e4 | 15188 | mpc_init2(this->u_.complex_val, mpc_precision); |
15189 | mpc_set(this->u_.complex_val, a.u_.complex_val, MPC_RNDNN); | |
0c77715b | 15190 | break; |
15191 | default: | |
15192 | go_unreachable(); | |
15193 | } | |
15194 | } | |
15195 | ||
15196 | // Assignment operator. | |
15197 | ||
15198 | Numeric_constant& | |
15199 | Numeric_constant::operator=(const Numeric_constant& a) | |
15200 | { | |
15201 | this->clear(); | |
15202 | this->classification_ = a.classification_; | |
15203 | this->type_ = a.type_; | |
15204 | switch (a.classification_) | |
15205 | { | |
15206 | case NC_INVALID: | |
15207 | break; | |
15208 | case NC_INT: | |
15209 | case NC_RUNE: | |
15210 | mpz_init_set(this->u_.int_val, a.u_.int_val); | |
15211 | break; | |
15212 | case NC_FLOAT: | |
15213 | mpfr_init_set(this->u_.float_val, a.u_.float_val, GMP_RNDN); | |
15214 | break; | |
15215 | case NC_COMPLEX: | |
fcbea5e4 | 15216 | mpc_init2(this->u_.complex_val, mpc_precision); |
15217 | mpc_set(this->u_.complex_val, a.u_.complex_val, MPC_RNDNN); | |
0c77715b | 15218 | break; |
15219 | default: | |
15220 | go_unreachable(); | |
15221 | } | |
15222 | return *this; | |
15223 | } | |
15224 | ||
15225 | // Clear the contents. | |
15226 | ||
15227 | void | |
15228 | Numeric_constant::clear() | |
15229 | { | |
15230 | switch (this->classification_) | |
15231 | { | |
15232 | case NC_INVALID: | |
15233 | break; | |
15234 | case NC_INT: | |
15235 | case NC_RUNE: | |
15236 | mpz_clear(this->u_.int_val); | |
15237 | break; | |
15238 | case NC_FLOAT: | |
15239 | mpfr_clear(this->u_.float_val); | |
15240 | break; | |
15241 | case NC_COMPLEX: | |
fcbea5e4 | 15242 | mpc_clear(this->u_.complex_val); |
0c77715b | 15243 | break; |
15244 | default: | |
15245 | go_unreachable(); | |
15246 | } | |
15247 | this->classification_ = NC_INVALID; | |
15248 | } | |
15249 | ||
15250 | // Set to an unsigned long value. | |
15251 | ||
15252 | void | |
15253 | Numeric_constant::set_unsigned_long(Type* type, unsigned long val) | |
15254 | { | |
15255 | this->clear(); | |
15256 | this->classification_ = NC_INT; | |
15257 | this->type_ = type; | |
15258 | mpz_init_set_ui(this->u_.int_val, val); | |
15259 | } | |
15260 | ||
15261 | // Set to an integer value. | |
15262 | ||
15263 | void | |
15264 | Numeric_constant::set_int(Type* type, const mpz_t val) | |
15265 | { | |
15266 | this->clear(); | |
15267 | this->classification_ = NC_INT; | |
15268 | this->type_ = type; | |
15269 | mpz_init_set(this->u_.int_val, val); | |
15270 | } | |
15271 | ||
15272 | // Set to a rune value. | |
15273 | ||
15274 | void | |
15275 | Numeric_constant::set_rune(Type* type, const mpz_t val) | |
15276 | { | |
15277 | this->clear(); | |
15278 | this->classification_ = NC_RUNE; | |
15279 | this->type_ = type; | |
15280 | mpz_init_set(this->u_.int_val, val); | |
15281 | } | |
15282 | ||
15283 | // Set to a floating point value. | |
15284 | ||
15285 | void | |
15286 | Numeric_constant::set_float(Type* type, const mpfr_t val) | |
15287 | { | |
15288 | this->clear(); | |
15289 | this->classification_ = NC_FLOAT; | |
15290 | this->type_ = type; | |
833b523c | 15291 | // Numeric constants do not have negative zero values, so remove |
15292 | // them here. They also don't have infinity or NaN values, but we | |
15293 | // should never see them here. | |
15294 | if (mpfr_zero_p(val)) | |
15295 | mpfr_init_set_ui(this->u_.float_val, 0, GMP_RNDN); | |
15296 | else | |
15297 | mpfr_init_set(this->u_.float_val, val, GMP_RNDN); | |
0c77715b | 15298 | } |
15299 | ||
15300 | // Set to a complex value. | |
15301 | ||
15302 | void | |
fcbea5e4 | 15303 | Numeric_constant::set_complex(Type* type, const mpc_t val) |
0c77715b | 15304 | { |
15305 | this->clear(); | |
15306 | this->classification_ = NC_COMPLEX; | |
15307 | this->type_ = type; | |
fcbea5e4 | 15308 | mpc_init2(this->u_.complex_val, mpc_precision); |
15309 | mpc_set(this->u_.complex_val, val, MPC_RNDNN); | |
0c77715b | 15310 | } |
15311 | ||
15312 | // Get an int value. | |
15313 | ||
15314 | void | |
15315 | Numeric_constant::get_int(mpz_t* val) const | |
15316 | { | |
15317 | go_assert(this->is_int()); | |
15318 | mpz_init_set(*val, this->u_.int_val); | |
15319 | } | |
15320 | ||
15321 | // Get a rune value. | |
15322 | ||
15323 | void | |
15324 | Numeric_constant::get_rune(mpz_t* val) const | |
15325 | { | |
15326 | go_assert(this->is_rune()); | |
15327 | mpz_init_set(*val, this->u_.int_val); | |
15328 | } | |
15329 | ||
15330 | // Get a floating point value. | |
15331 | ||
15332 | void | |
15333 | Numeric_constant::get_float(mpfr_t* val) const | |
15334 | { | |
15335 | go_assert(this->is_float()); | |
15336 | mpfr_init_set(*val, this->u_.float_val, GMP_RNDN); | |
15337 | } | |
15338 | ||
15339 | // Get a complex value. | |
15340 | ||
15341 | void | |
fcbea5e4 | 15342 | Numeric_constant::get_complex(mpc_t* val) const |
0c77715b | 15343 | { |
15344 | go_assert(this->is_complex()); | |
fcbea5e4 | 15345 | mpc_init2(*val, mpc_precision); |
15346 | mpc_set(*val, this->u_.complex_val, MPC_RNDNN); | |
0c77715b | 15347 | } |
15348 | ||
15349 | // Express value as unsigned long if possible. | |
15350 | ||
15351 | Numeric_constant::To_unsigned_long | |
15352 | Numeric_constant::to_unsigned_long(unsigned long* val) const | |
15353 | { | |
15354 | switch (this->classification_) | |
15355 | { | |
15356 | case NC_INT: | |
15357 | case NC_RUNE: | |
15358 | return this->mpz_to_unsigned_long(this->u_.int_val, val); | |
15359 | case NC_FLOAT: | |
15360 | return this->mpfr_to_unsigned_long(this->u_.float_val, val); | |
15361 | case NC_COMPLEX: | |
fcbea5e4 | 15362 | if (!mpfr_zero_p(mpc_imagref(this->u_.complex_val))) |
0c77715b | 15363 | return NC_UL_NOTINT; |
fcbea5e4 | 15364 | return this->mpfr_to_unsigned_long(mpc_realref(this->u_.complex_val), |
15365 | val); | |
0c77715b | 15366 | default: |
15367 | go_unreachable(); | |
15368 | } | |
15369 | } | |
15370 | ||
15371 | // Express integer value as unsigned long if possible. | |
15372 | ||
15373 | Numeric_constant::To_unsigned_long | |
15374 | Numeric_constant::mpz_to_unsigned_long(const mpz_t ival, | |
15375 | unsigned long *val) const | |
15376 | { | |
15377 | if (mpz_sgn(ival) < 0) | |
15378 | return NC_UL_NEGATIVE; | |
15379 | unsigned long ui = mpz_get_ui(ival); | |
15380 | if (mpz_cmp_ui(ival, ui) != 0) | |
15381 | return NC_UL_BIG; | |
15382 | *val = ui; | |
15383 | return NC_UL_VALID; | |
15384 | } | |
15385 | ||
15386 | // Express floating point value as unsigned long if possible. | |
15387 | ||
15388 | Numeric_constant::To_unsigned_long | |
15389 | Numeric_constant::mpfr_to_unsigned_long(const mpfr_t fval, | |
15390 | unsigned long *val) const | |
15391 | { | |
15392 | if (!mpfr_integer_p(fval)) | |
15393 | return NC_UL_NOTINT; | |
15394 | mpz_t ival; | |
15395 | mpz_init(ival); | |
15396 | mpfr_get_z(ival, fval, GMP_RNDN); | |
15397 | To_unsigned_long ret = this->mpz_to_unsigned_long(ival, val); | |
15398 | mpz_clear(ival); | |
15399 | return ret; | |
15400 | } | |
15401 | ||
15402 | // Convert value to integer if possible. | |
15403 | ||
15404 | bool | |
15405 | Numeric_constant::to_int(mpz_t* val) const | |
15406 | { | |
15407 | switch (this->classification_) | |
15408 | { | |
15409 | case NC_INT: | |
15410 | case NC_RUNE: | |
15411 | mpz_init_set(*val, this->u_.int_val); | |
15412 | return true; | |
15413 | case NC_FLOAT: | |
15414 | if (!mpfr_integer_p(this->u_.float_val)) | |
15415 | return false; | |
15416 | mpz_init(*val); | |
15417 | mpfr_get_z(*val, this->u_.float_val, GMP_RNDN); | |
15418 | return true; | |
15419 | case NC_COMPLEX: | |
fcbea5e4 | 15420 | if (!mpfr_zero_p(mpc_imagref(this->u_.complex_val)) |
15421 | || !mpfr_integer_p(mpc_realref(this->u_.complex_val))) | |
0c77715b | 15422 | return false; |
15423 | mpz_init(*val); | |
fcbea5e4 | 15424 | mpfr_get_z(*val, mpc_realref(this->u_.complex_val), GMP_RNDN); |
0c77715b | 15425 | return true; |
15426 | default: | |
15427 | go_unreachable(); | |
15428 | } | |
15429 | } | |
15430 | ||
15431 | // Convert value to floating point if possible. | |
15432 | ||
15433 | bool | |
15434 | Numeric_constant::to_float(mpfr_t* val) const | |
15435 | { | |
15436 | switch (this->classification_) | |
15437 | { | |
15438 | case NC_INT: | |
15439 | case NC_RUNE: | |
15440 | mpfr_init_set_z(*val, this->u_.int_val, GMP_RNDN); | |
15441 | return true; | |
15442 | case NC_FLOAT: | |
15443 | mpfr_init_set(*val, this->u_.float_val, GMP_RNDN); | |
15444 | return true; | |
15445 | case NC_COMPLEX: | |
fcbea5e4 | 15446 | if (!mpfr_zero_p(mpc_imagref(this->u_.complex_val))) |
0c77715b | 15447 | return false; |
fcbea5e4 | 15448 | mpfr_init_set(*val, mpc_realref(this->u_.complex_val), GMP_RNDN); |
0c77715b | 15449 | return true; |
15450 | default: | |
15451 | go_unreachable(); | |
15452 | } | |
15453 | } | |
15454 | ||
15455 | // Convert value to complex. | |
15456 | ||
15457 | bool | |
fcbea5e4 | 15458 | Numeric_constant::to_complex(mpc_t* val) const |
0c77715b | 15459 | { |
fcbea5e4 | 15460 | mpc_init2(*val, mpc_precision); |
0c77715b | 15461 | switch (this->classification_) |
15462 | { | |
15463 | case NC_INT: | |
15464 | case NC_RUNE: | |
fcbea5e4 | 15465 | mpc_set_z(*val, this->u_.int_val, MPC_RNDNN); |
0c77715b | 15466 | return true; |
15467 | case NC_FLOAT: | |
fcbea5e4 | 15468 | mpc_set_fr(*val, this->u_.float_val, MPC_RNDNN); |
0c77715b | 15469 | return true; |
15470 | case NC_COMPLEX: | |
fcbea5e4 | 15471 | mpc_set(*val, this->u_.complex_val, MPC_RNDNN); |
0c77715b | 15472 | return true; |
15473 | default: | |
15474 | go_unreachable(); | |
15475 | } | |
15476 | } | |
15477 | ||
15478 | // Get the type. | |
15479 | ||
15480 | Type* | |
15481 | Numeric_constant::type() const | |
15482 | { | |
15483 | if (this->type_ != NULL) | |
15484 | return this->type_; | |
15485 | switch (this->classification_) | |
15486 | { | |
15487 | case NC_INT: | |
15488 | return Type::make_abstract_integer_type(); | |
15489 | case NC_RUNE: | |
15490 | return Type::make_abstract_character_type(); | |
15491 | case NC_FLOAT: | |
15492 | return Type::make_abstract_float_type(); | |
15493 | case NC_COMPLEX: | |
15494 | return Type::make_abstract_complex_type(); | |
15495 | default: | |
15496 | go_unreachable(); | |
15497 | } | |
15498 | } | |
15499 | ||
15500 | // If the constant can be expressed in TYPE, then set the type of the | |
15501 | // constant to TYPE and return true. Otherwise return false, and, if | |
15502 | // ISSUE_ERROR is true, report an appropriate error message. | |
15503 | ||
15504 | bool | |
15505 | Numeric_constant::set_type(Type* type, bool issue_error, Location loc) | |
15506 | { | |
15507 | bool ret; | |
15508 | if (type == NULL) | |
15509 | ret = true; | |
15510 | else if (type->integer_type() != NULL) | |
15511 | ret = this->check_int_type(type->integer_type(), issue_error, loc); | |
15512 | else if (type->float_type() != NULL) | |
15513 | ret = this->check_float_type(type->float_type(), issue_error, loc); | |
15514 | else if (type->complex_type() != NULL) | |
15515 | ret = this->check_complex_type(type->complex_type(), issue_error, loc); | |
15516 | else | |
15517 | go_unreachable(); | |
15518 | if (ret) | |
15519 | this->type_ = type; | |
15520 | return ret; | |
15521 | } | |
15522 | ||
15523 | // Check whether the constant can be expressed in an integer type. | |
15524 | ||
15525 | bool | |
15526 | Numeric_constant::check_int_type(Integer_type* type, bool issue_error, | |
15527 | Location location) const | |
15528 | { | |
15529 | mpz_t val; | |
15530 | switch (this->classification_) | |
15531 | { | |
15532 | case NC_INT: | |
15533 | case NC_RUNE: | |
15534 | mpz_init_set(val, this->u_.int_val); | |
15535 | break; | |
15536 | ||
15537 | case NC_FLOAT: | |
15538 | if (!mpfr_integer_p(this->u_.float_val)) | |
15539 | { | |
15540 | if (issue_error) | |
15541 | error_at(location, "floating point constant truncated to integer"); | |
15542 | return false; | |
15543 | } | |
15544 | mpz_init(val); | |
15545 | mpfr_get_z(val, this->u_.float_val, GMP_RNDN); | |
15546 | break; | |
15547 | ||
15548 | case NC_COMPLEX: | |
fcbea5e4 | 15549 | if (!mpfr_integer_p(mpc_realref(this->u_.complex_val)) |
15550 | || !mpfr_zero_p(mpc_imagref(this->u_.complex_val))) | |
0c77715b | 15551 | { |
15552 | if (issue_error) | |
15553 | error_at(location, "complex constant truncated to integer"); | |
15554 | return false; | |
15555 | } | |
15556 | mpz_init(val); | |
fcbea5e4 | 15557 | mpfr_get_z(val, mpc_realref(this->u_.complex_val), GMP_RNDN); |
0c77715b | 15558 | break; |
15559 | ||
15560 | default: | |
15561 | go_unreachable(); | |
15562 | } | |
15563 | ||
15564 | bool ret; | |
15565 | if (type->is_abstract()) | |
15566 | ret = true; | |
15567 | else | |
15568 | { | |
15569 | int bits = mpz_sizeinbase(val, 2); | |
15570 | if (type->is_unsigned()) | |
15571 | { | |
15572 | // For an unsigned type we can only accept a nonnegative | |
15573 | // number, and we must be able to represents at least BITS. | |
15574 | ret = mpz_sgn(val) >= 0 && bits <= type->bits(); | |
15575 | } | |
15576 | else | |
15577 | { | |
15578 | // For a signed type we need an extra bit to indicate the | |
15579 | // sign. We have to handle the most negative integer | |
15580 | // specially. | |
15581 | ret = (bits + 1 <= type->bits() | |
15582 | || (bits <= type->bits() | |
15583 | && mpz_sgn(val) < 0 | |
15584 | && (mpz_scan1(val, 0) | |
15585 | == static_cast<unsigned long>(type->bits() - 1)) | |
15586 | && mpz_scan0(val, type->bits()) == ULONG_MAX)); | |
15587 | } | |
15588 | } | |
15589 | ||
15590 | if (!ret && issue_error) | |
15591 | error_at(location, "integer constant overflow"); | |
15592 | ||
15593 | return ret; | |
15594 | } | |
15595 | ||
15596 | // Check whether the constant can be expressed in a floating point | |
15597 | // type. | |
15598 | ||
15599 | bool | |
15600 | Numeric_constant::check_float_type(Float_type* type, bool issue_error, | |
d0bcce51 | 15601 | Location location) |
0c77715b | 15602 | { |
15603 | mpfr_t val; | |
15604 | switch (this->classification_) | |
15605 | { | |
15606 | case NC_INT: | |
15607 | case NC_RUNE: | |
15608 | mpfr_init_set_z(val, this->u_.int_val, GMP_RNDN); | |
15609 | break; | |
15610 | ||
15611 | case NC_FLOAT: | |
15612 | mpfr_init_set(val, this->u_.float_val, GMP_RNDN); | |
15613 | break; | |
15614 | ||
15615 | case NC_COMPLEX: | |
fcbea5e4 | 15616 | if (!mpfr_zero_p(mpc_imagref(this->u_.complex_val))) |
0c77715b | 15617 | { |
15618 | if (issue_error) | |
15619 | error_at(location, "complex constant truncated to float"); | |
15620 | return false; | |
15621 | } | |
fcbea5e4 | 15622 | mpfr_init_set(val, mpc_realref(this->u_.complex_val), GMP_RNDN); |
0c77715b | 15623 | break; |
15624 | ||
15625 | default: | |
15626 | go_unreachable(); | |
15627 | } | |
15628 | ||
15629 | bool ret; | |
15630 | if (type->is_abstract()) | |
15631 | ret = true; | |
15632 | else if (mpfr_nan_p(val) || mpfr_inf_p(val) || mpfr_zero_p(val)) | |
15633 | { | |
15634 | // A NaN or Infinity always fits in the range of the type. | |
15635 | ret = true; | |
15636 | } | |
15637 | else | |
15638 | { | |
15639 | mp_exp_t exp = mpfr_get_exp(val); | |
15640 | mp_exp_t max_exp; | |
15641 | switch (type->bits()) | |
15642 | { | |
15643 | case 32: | |
15644 | max_exp = 128; | |
15645 | break; | |
15646 | case 64: | |
15647 | max_exp = 1024; | |
15648 | break; | |
15649 | default: | |
15650 | go_unreachable(); | |
15651 | } | |
15652 | ||
15653 | ret = exp <= max_exp; | |
d0bcce51 | 15654 | |
15655 | if (ret) | |
15656 | { | |
15657 | // Round the constant to the desired type. | |
15658 | mpfr_t t; | |
15659 | mpfr_init(t); | |
15660 | switch (type->bits()) | |
15661 | { | |
15662 | case 32: | |
15663 | mpfr_set_prec(t, 24); | |
15664 | break; | |
15665 | case 64: | |
15666 | mpfr_set_prec(t, 53); | |
15667 | break; | |
15668 | default: | |
15669 | go_unreachable(); | |
15670 | } | |
15671 | mpfr_set(t, val, GMP_RNDN); | |
15672 | mpfr_set(val, t, GMP_RNDN); | |
15673 | mpfr_clear(t); | |
15674 | ||
15675 | this->set_float(type, val); | |
15676 | } | |
0c77715b | 15677 | } |
15678 | ||
15679 | mpfr_clear(val); | |
15680 | ||
15681 | if (!ret && issue_error) | |
15682 | error_at(location, "floating point constant overflow"); | |
15683 | ||
15684 | return ret; | |
15685 | } | |
15686 | ||
15687 | // Check whether the constant can be expressed in a complex type. | |
15688 | ||
15689 | bool | |
15690 | Numeric_constant::check_complex_type(Complex_type* type, bool issue_error, | |
d0bcce51 | 15691 | Location location) |
0c77715b | 15692 | { |
15693 | if (type->is_abstract()) | |
15694 | return true; | |
15695 | ||
15696 | mp_exp_t max_exp; | |
15697 | switch (type->bits()) | |
15698 | { | |
15699 | case 64: | |
15700 | max_exp = 128; | |
15701 | break; | |
15702 | case 128: | |
15703 | max_exp = 1024; | |
15704 | break; | |
15705 | default: | |
15706 | go_unreachable(); | |
15707 | } | |
15708 | ||
fcbea5e4 | 15709 | mpc_t val; |
15710 | mpc_init2(val, mpc_precision); | |
0c77715b | 15711 | switch (this->classification_) |
15712 | { | |
15713 | case NC_INT: | |
15714 | case NC_RUNE: | |
fcbea5e4 | 15715 | mpc_set_z(val, this->u_.int_val, MPC_RNDNN); |
0c77715b | 15716 | break; |
15717 | ||
15718 | case NC_FLOAT: | |
fcbea5e4 | 15719 | mpc_set_fr(val, this->u_.float_val, MPC_RNDNN); |
0c77715b | 15720 | break; |
15721 | ||
15722 | case NC_COMPLEX: | |
fcbea5e4 | 15723 | mpc_set(val, this->u_.complex_val, MPC_RNDNN); |
0c77715b | 15724 | break; |
15725 | ||
15726 | default: | |
15727 | go_unreachable(); | |
15728 | } | |
15729 | ||
d0bcce51 | 15730 | bool ret = true; |
fcbea5e4 | 15731 | if (!mpfr_nan_p(mpc_realref(val)) |
15732 | && !mpfr_inf_p(mpc_realref(val)) | |
15733 | && !mpfr_zero_p(mpc_realref(val)) | |
15734 | && mpfr_get_exp(mpc_realref(val)) > max_exp) | |
d0bcce51 | 15735 | { |
15736 | if (issue_error) | |
15737 | error_at(location, "complex real part overflow"); | |
15738 | ret = false; | |
15739 | } | |
0c77715b | 15740 | |
fcbea5e4 | 15741 | if (!mpfr_nan_p(mpc_imagref(val)) |
15742 | && !mpfr_inf_p(mpc_imagref(val)) | |
15743 | && !mpfr_zero_p(mpc_imagref(val)) | |
15744 | && mpfr_get_exp(mpc_imagref(val)) > max_exp) | |
d0bcce51 | 15745 | { |
15746 | if (issue_error) | |
15747 | error_at(location, "complex imaginary part overflow"); | |
15748 | ret = false; | |
15749 | } | |
0c77715b | 15750 | |
d0bcce51 | 15751 | if (ret) |
15752 | { | |
15753 | // Round the constant to the desired type. | |
fcbea5e4 | 15754 | mpc_t t; |
d0bcce51 | 15755 | switch (type->bits()) |
15756 | { | |
15757 | case 64: | |
fcbea5e4 | 15758 | mpc_init2(t, 24); |
d0bcce51 | 15759 | break; |
15760 | case 128: | |
fcbea5e4 | 15761 | mpc_init2(t, 53); |
d0bcce51 | 15762 | break; |
15763 | default: | |
15764 | go_unreachable(); | |
15765 | } | |
fcbea5e4 | 15766 | mpc_set(t, val, MPC_RNDNN); |
15767 | mpc_set(val, t, MPC_RNDNN); | |
15768 | mpc_clear(t); | |
d0bcce51 | 15769 | |
fcbea5e4 | 15770 | this->set_complex(type, val); |
d0bcce51 | 15771 | } |
15772 | ||
fcbea5e4 | 15773 | mpc_clear(val); |
0c77715b | 15774 | |
15775 | return ret; | |
15776 | } | |
15777 | ||
15778 | // Return an Expression for this value. | |
15779 | ||
15780 | Expression* | |
15781 | Numeric_constant::expression(Location loc) const | |
15782 | { | |
15783 | switch (this->classification_) | |
15784 | { | |
15785 | case NC_INT: | |
e67508fa | 15786 | return Expression::make_integer_z(&this->u_.int_val, this->type_, loc); |
0c77715b | 15787 | case NC_RUNE: |
15788 | return Expression::make_character(&this->u_.int_val, this->type_, loc); | |
15789 | case NC_FLOAT: | |
15790 | return Expression::make_float(&this->u_.float_val, this->type_, loc); | |
15791 | case NC_COMPLEX: | |
fcbea5e4 | 15792 | return Expression::make_complex(&this->u_.complex_val, this->type_, loc); |
0c77715b | 15793 | default: |
15794 | go_unreachable(); | |
15795 | } | |
15796 | } |