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e440a328 | 1 | // expressions.cc -- Go frontend expression handling. |
2 | ||
3 | // Copyright 2009 The Go Authors. All rights reserved. | |
4 | // Use of this source code is governed by a BSD-style | |
5 | // license that can be found in the LICENSE file. | |
6 | ||
7 | #include "go-system.h" | |
8 | ||
ffe743ca | 9 | #include <algorithm> |
10 | ||
e440a328 | 11 | #include "go-c.h" |
12 | #include "gogo.h" | |
631d5788 | 13 | #include "go-diagnostics.h" |
438b4bec | 14 | #include "go-encode-id.h" |
e440a328 | 15 | #include "types.h" |
16 | #include "export.h" | |
17 | #include "import.h" | |
18 | #include "statements.h" | |
19 | #include "lex.h" | |
a9182619 | 20 | #include "runtime.h" |
6e193e6f | 21 | #include "backend.h" |
e440a328 | 22 | #include "expressions.h" |
d751bb78 | 23 | #include "ast-dump.h" |
e440a328 | 24 | |
25 | // Class Expression. | |
26 | ||
27 | Expression::Expression(Expression_classification classification, | |
b13c66cd | 28 | Location location) |
e440a328 | 29 | : classification_(classification), location_(location) |
30 | { | |
31 | } | |
32 | ||
33 | Expression::~Expression() | |
34 | { | |
35 | } | |
36 | ||
e440a328 | 37 | // Traverse the expressions. |
38 | ||
39 | int | |
40 | Expression::traverse(Expression** pexpr, Traverse* traverse) | |
41 | { | |
42 | Expression* expr = *pexpr; | |
43 | if ((traverse->traverse_mask() & Traverse::traverse_expressions) != 0) | |
44 | { | |
45 | int t = traverse->expression(pexpr); | |
46 | if (t == TRAVERSE_EXIT) | |
47 | return TRAVERSE_EXIT; | |
48 | else if (t == TRAVERSE_SKIP_COMPONENTS) | |
49 | return TRAVERSE_CONTINUE; | |
50 | } | |
51 | return expr->do_traverse(traverse); | |
52 | } | |
53 | ||
54 | // Traverse subexpressions of this expression. | |
55 | ||
56 | int | |
57 | Expression::traverse_subexpressions(Traverse* traverse) | |
58 | { | |
59 | return this->do_traverse(traverse); | |
60 | } | |
61 | ||
62 | // Default implementation for do_traverse for child classes. | |
63 | ||
64 | int | |
65 | Expression::do_traverse(Traverse*) | |
66 | { | |
67 | return TRAVERSE_CONTINUE; | |
68 | } | |
69 | ||
70 | // This virtual function is called by the parser if the value of this | |
a7549a6a | 71 | // expression is being discarded. By default, we give an error. |
72 | // Expressions with side effects override. | |
e440a328 | 73 | |
4f2138d7 | 74 | bool |
e440a328 | 75 | Expression::do_discarding_value() |
76 | { | |
a7549a6a | 77 | this->unused_value_error(); |
4f2138d7 | 78 | return false; |
e440a328 | 79 | } |
80 | ||
81 | // This virtual function is called to export expressions. This will | |
82 | // only be used by expressions which may be constant. | |
83 | ||
84 | void | |
85 | Expression::do_export(Export*) const | |
86 | { | |
c3e6f413 | 87 | go_unreachable(); |
e440a328 | 88 | } |
89 | ||
a7549a6a | 90 | // Give an error saying that the value of the expression is not used. |
e440a328 | 91 | |
92 | void | |
a7549a6a | 93 | Expression::unused_value_error() |
e440a328 | 94 | { |
4f2138d7 | 95 | this->report_error(_("value computed is not used")); |
e440a328 | 96 | } |
97 | ||
98 | // Note that this expression is an error. This is called by children | |
99 | // when they discover an error. | |
100 | ||
101 | void | |
102 | Expression::set_is_error() | |
103 | { | |
104 | this->classification_ = EXPRESSION_ERROR; | |
105 | } | |
106 | ||
107 | // For children to call to report an error conveniently. | |
108 | ||
109 | void | |
110 | Expression::report_error(const char* msg) | |
111 | { | |
631d5788 | 112 | go_error_at(this->location_, "%s", msg); |
e440a328 | 113 | this->set_is_error(); |
114 | } | |
115 | ||
116 | // Set types of variables and constants. This is implemented by the | |
117 | // child class. | |
118 | ||
119 | void | |
120 | Expression::determine_type(const Type_context* context) | |
121 | { | |
122 | this->do_determine_type(context); | |
123 | } | |
124 | ||
125 | // Set types when there is no context. | |
126 | ||
127 | void | |
128 | Expression::determine_type_no_context() | |
129 | { | |
130 | Type_context context; | |
131 | this->do_determine_type(&context); | |
132 | } | |
133 | ||
2c809f8f | 134 | // Return an expression handling any conversions which must be done during |
e440a328 | 135 | // assignment. |
136 | ||
2c809f8f | 137 | Expression* |
b4a33049 | 138 | Expression::convert_for_assignment(Gogo*, Type* lhs_type, |
2c809f8f | 139 | Expression* rhs, Location location) |
e440a328 | 140 | { |
2c809f8f | 141 | Type* rhs_type = rhs->type(); |
142 | if (lhs_type->is_error() | |
143 | || rhs_type->is_error() | |
144 | || rhs->is_error_expression()) | |
145 | return Expression::make_error(location); | |
e440a328 | 146 | |
22984631 | 147 | bool are_identical = Type::are_identical(lhs_type, rhs_type, false, NULL); |
148 | if (!are_identical && lhs_type->interface_type() != NULL) | |
e440a328 | 149 | { |
150 | if (rhs_type->interface_type() == NULL) | |
2c809f8f | 151 | return Expression::convert_type_to_interface(lhs_type, rhs, location); |
e440a328 | 152 | else |
2c809f8f | 153 | return Expression::convert_interface_to_interface(lhs_type, rhs, false, |
154 | location); | |
e440a328 | 155 | } |
22984631 | 156 | else if (!are_identical && rhs_type->interface_type() != NULL) |
2c809f8f | 157 | return Expression::convert_interface_to_type(lhs_type, rhs, location); |
411eb89e | 158 | else if (lhs_type->is_slice_type() && rhs_type->is_nil_type()) |
e440a328 | 159 | { |
2c809f8f | 160 | // Assigning nil to a slice. |
2c809f8f | 161 | Expression* nil = Expression::make_nil(location); |
e67508fa | 162 | Expression* zero = Expression::make_integer_ul(0, NULL, location); |
2c809f8f | 163 | return Expression::make_slice_value(lhs_type, nil, zero, zero, location); |
e440a328 | 164 | } |
165 | else if (rhs_type->is_nil_type()) | |
2c809f8f | 166 | return Expression::make_nil(location); |
22984631 | 167 | else if (are_identical) |
e440a328 | 168 | { |
22984631 | 169 | if (lhs_type->forwarded() != rhs_type->forwarded()) |
170 | { | |
171 | // Different but identical types require an explicit | |
172 | // conversion. This happens with type aliases. | |
173 | return Expression::make_cast(lhs_type, rhs, location); | |
174 | } | |
175 | ||
e440a328 | 176 | // No conversion is needed. |
2c809f8f | 177 | return rhs; |
178 | } | |
179 | else if (lhs_type->points_to() != NULL) | |
180 | return Expression::make_unsafe_cast(lhs_type, rhs, location); | |
181 | else if (lhs_type->is_numeric_type()) | |
182 | return Expression::make_cast(lhs_type, rhs, location); | |
183 | else if ((lhs_type->struct_type() != NULL | |
184 | && rhs_type->struct_type() != NULL) | |
185 | || (lhs_type->array_type() != NULL | |
186 | && rhs_type->array_type() != NULL)) | |
e440a328 | 187 | { |
188 | // This conversion must be permitted by Go, or we wouldn't have | |
189 | // gotten here. | |
2c809f8f | 190 | return Expression::make_unsafe_cast(lhs_type, rhs, location); |
e440a328 | 191 | } |
192 | else | |
2c809f8f | 193 | return rhs; |
e440a328 | 194 | } |
195 | ||
2c809f8f | 196 | // Return an expression for a conversion from a non-interface type to an |
e440a328 | 197 | // interface type. |
198 | ||
2c809f8f | 199 | Expression* |
200 | Expression::convert_type_to_interface(Type* lhs_type, Expression* rhs, | |
201 | Location location) | |
e440a328 | 202 | { |
e440a328 | 203 | Interface_type* lhs_interface_type = lhs_type->interface_type(); |
204 | bool lhs_is_empty = lhs_interface_type->is_empty(); | |
205 | ||
206 | // Since RHS_TYPE is a static type, we can create the interface | |
207 | // method table at compile time. | |
208 | ||
209 | // When setting an interface to nil, we just set both fields to | |
210 | // NULL. | |
2c809f8f | 211 | Type* rhs_type = rhs->type(); |
e440a328 | 212 | if (rhs_type->is_nil_type()) |
63697958 | 213 | { |
2c809f8f | 214 | Expression* nil = Expression::make_nil(location); |
215 | return Expression::make_interface_value(lhs_type, nil, nil, location); | |
63697958 | 216 | } |
e440a328 | 217 | |
218 | // This should have been checked already. | |
2b8629dd | 219 | if (!lhs_interface_type->implements_interface(rhs_type, NULL)) |
220 | { | |
221 | go_assert(saw_errors()); | |
222 | return Expression::make_error(location); | |
223 | } | |
e440a328 | 224 | |
e440a328 | 225 | // An interface is a tuple. If LHS_TYPE is an empty interface type, |
226 | // then the first field is the type descriptor for RHS_TYPE. | |
227 | // Otherwise it is the interface method table for RHS_TYPE. | |
2c809f8f | 228 | Expression* first_field; |
e440a328 | 229 | if (lhs_is_empty) |
2c809f8f | 230 | first_field = Expression::make_type_descriptor(rhs_type, location); |
e440a328 | 231 | else |
232 | { | |
233 | // Build the interface method table for this interface and this | |
234 | // object type: a list of function pointers for each interface | |
235 | // method. | |
236 | Named_type* rhs_named_type = rhs_type->named_type(); | |
c0cab2ec | 237 | Struct_type* rhs_struct_type = rhs_type->struct_type(); |
e440a328 | 238 | bool is_pointer = false; |
c0cab2ec | 239 | if (rhs_named_type == NULL && rhs_struct_type == NULL) |
e440a328 | 240 | { |
241 | rhs_named_type = rhs_type->deref()->named_type(); | |
c0cab2ec | 242 | rhs_struct_type = rhs_type->deref()->struct_type(); |
e440a328 | 243 | is_pointer = true; |
244 | } | |
c0cab2ec | 245 | if (rhs_named_type != NULL) |
2c809f8f | 246 | first_field = |
247 | rhs_named_type->interface_method_table(lhs_interface_type, | |
248 | is_pointer); | |
c0cab2ec | 249 | else if (rhs_struct_type != NULL) |
2c809f8f | 250 | first_field = |
251 | rhs_struct_type->interface_method_table(lhs_interface_type, | |
252 | is_pointer); | |
c0cab2ec | 253 | else |
2c809f8f | 254 | first_field = Expression::make_nil(location); |
e440a328 | 255 | } |
e440a328 | 256 | |
2c809f8f | 257 | Expression* obj; |
e440a328 | 258 | if (rhs_type->points_to() != NULL) |
259 | { | |
2c809f8f | 260 | // We are assigning a pointer to the interface; the interface |
e440a328 | 261 | // holds the pointer itself. |
2c809f8f | 262 | obj = rhs; |
263 | } | |
264 | else | |
265 | { | |
266 | // We are assigning a non-pointer value to the interface; the | |
45ff893b | 267 | // interface gets a copy of the value in the heap if it escapes. |
268 | // TODO(cmang): Associate escape state state of RHS with newly | |
269 | // created OBJ. | |
2c809f8f | 270 | obj = Expression::make_heap_expression(rhs, location); |
e440a328 | 271 | } |
272 | ||
2c809f8f | 273 | return Expression::make_interface_value(lhs_type, first_field, obj, location); |
274 | } | |
e440a328 | 275 | |
2c809f8f | 276 | // Return an expression for the type descriptor of RHS. |
e440a328 | 277 | |
2c809f8f | 278 | Expression* |
279 | Expression::get_interface_type_descriptor(Expression* rhs) | |
280 | { | |
281 | go_assert(rhs->type()->interface_type() != NULL); | |
282 | Location location = rhs->location(); | |
e440a328 | 283 | |
2c809f8f | 284 | // The type descriptor is the first field of an empty interface. |
285 | if (rhs->type()->interface_type()->is_empty()) | |
286 | return Expression::make_interface_info(rhs, INTERFACE_INFO_TYPE_DESCRIPTOR, | |
287 | location); | |
288 | ||
289 | Expression* mtable = | |
290 | Expression::make_interface_info(rhs, INTERFACE_INFO_METHODS, location); | |
e440a328 | 291 | |
2c809f8f | 292 | Expression* descriptor = |
293 | Expression::make_unary(OPERATOR_MULT, mtable, location); | |
294 | descriptor = Expression::make_field_reference(descriptor, 0, location); | |
295 | Expression* nil = Expression::make_nil(location); | |
e440a328 | 296 | |
2c809f8f | 297 | Expression* eq = |
298 | Expression::make_binary(OPERATOR_EQEQ, mtable, nil, location); | |
299 | return Expression::make_conditional(eq, nil, descriptor, location); | |
e440a328 | 300 | } |
301 | ||
2c809f8f | 302 | // Return an expression for the conversion of an interface type to an |
e440a328 | 303 | // interface type. |
304 | ||
2c809f8f | 305 | Expression* |
306 | Expression::convert_interface_to_interface(Type *lhs_type, Expression* rhs, | |
307 | bool for_type_guard, | |
308 | Location location) | |
e440a328 | 309 | { |
8ba8cc87 | 310 | if (Type::are_identical(lhs_type, rhs->type(), false, NULL)) |
311 | return rhs; | |
312 | ||
e440a328 | 313 | Interface_type* lhs_interface_type = lhs_type->interface_type(); |
314 | bool lhs_is_empty = lhs_interface_type->is_empty(); | |
315 | ||
e440a328 | 316 | // In the general case this requires runtime examination of the type |
317 | // method table to match it up with the interface methods. | |
318 | ||
319 | // FIXME: If all of the methods in the right hand side interface | |
320 | // also appear in the left hand side interface, then we don't need | |
321 | // to do a runtime check, although we still need to build a new | |
322 | // method table. | |
323 | ||
8ba8cc87 | 324 | // We are going to evaluate RHS multiple times. |
325 | go_assert(rhs->is_variable()); | |
326 | ||
e440a328 | 327 | // Get the type descriptor for the right hand side. This will be |
328 | // NULL for a nil interface. | |
2c809f8f | 329 | Expression* rhs_type_expr = Expression::get_interface_type_descriptor(rhs); |
330 | Expression* lhs_type_expr = | |
331 | Expression::make_type_descriptor(lhs_type, location); | |
e440a328 | 332 | |
2c809f8f | 333 | Expression* first_field; |
e440a328 | 334 | if (for_type_guard) |
335 | { | |
336 | // A type assertion fails when converting a nil interface. | |
6098d6cb | 337 | first_field = Runtime::make_call(Runtime::ASSERTITAB, location, 2, |
338 | lhs_type_expr, rhs_type_expr); | |
e440a328 | 339 | } |
340 | else if (lhs_is_empty) | |
341 | { | |
2c809f8f | 342 | // A conversion to an empty interface always succeeds, and the |
e440a328 | 343 | // first field is just the type descriptor of the object. |
2c809f8f | 344 | first_field = rhs_type_expr; |
e440a328 | 345 | } |
346 | else | |
347 | { | |
348 | // A conversion to a non-empty interface may fail, but unlike a | |
349 | // type assertion converting nil will always succeed. | |
6098d6cb | 350 | first_field = Runtime::make_call(Runtime::REQUIREITAB, location, 2, |
351 | lhs_type_expr, rhs_type_expr); | |
e440a328 | 352 | } |
353 | ||
354 | // The second field is simply the object pointer. | |
2c809f8f | 355 | Expression* obj = |
356 | Expression::make_interface_info(rhs, INTERFACE_INFO_OBJECT, location); | |
357 | return Expression::make_interface_value(lhs_type, first_field, obj, location); | |
e440a328 | 358 | } |
359 | ||
2c809f8f | 360 | // Return an expression for the conversion of an interface type to a |
e440a328 | 361 | // non-interface type. |
362 | ||
2c809f8f | 363 | Expression* |
364 | Expression::convert_interface_to_type(Type *lhs_type, Expression* rhs, | |
365 | Location location) | |
e440a328 | 366 | { |
8ba8cc87 | 367 | // We are going to evaluate RHS multiple times. |
368 | go_assert(rhs->is_variable()); | |
369 | ||
e440a328 | 370 | // Call a function to check that the type is valid. The function |
371 | // will panic with an appropriate runtime type error if the type is | |
372 | // not valid. | |
2c809f8f | 373 | Expression* lhs_type_expr = Expression::make_type_descriptor(lhs_type, |
374 | location); | |
375 | Expression* rhs_descriptor = | |
376 | Expression::get_interface_type_descriptor(rhs); | |
377 | ||
378 | Type* rhs_type = rhs->type(); | |
379 | Expression* rhs_inter_expr = Expression::make_type_descriptor(rhs_type, | |
380 | location); | |
381 | ||
6098d6cb | 382 | Expression* check_iface = Runtime::make_call(Runtime::ASSERTI2T, |
2c809f8f | 383 | location, 3, lhs_type_expr, |
384 | rhs_descriptor, rhs_inter_expr); | |
e440a328 | 385 | |
386 | // If the call succeeds, pull out the value. | |
2c809f8f | 387 | Expression* obj = Expression::make_interface_info(rhs, INTERFACE_INFO_OBJECT, |
388 | location); | |
e440a328 | 389 | |
390 | // If the value is a pointer, then it is the value we want. | |
391 | // Otherwise it points to the value. | |
392 | if (lhs_type->points_to() == NULL) | |
393 | { | |
2c809f8f | 394 | obj = Expression::make_unsafe_cast(Type::make_pointer_type(lhs_type), obj, |
395 | location); | |
396 | obj = Expression::make_unary(OPERATOR_MULT, obj, location); | |
e440a328 | 397 | } |
2c809f8f | 398 | return Expression::make_compound(check_iface, obj, location); |
e440a328 | 399 | } |
400 | ||
ea664253 | 401 | // Convert an expression to its backend representation. This is implemented by |
402 | // the child class. Not that it is not in general safe to call this multiple | |
e440a328 | 403 | // times for a single expression, but that we don't catch such errors. |
404 | ||
ea664253 | 405 | Bexpression* |
406 | Expression::get_backend(Translate_context* context) | |
e440a328 | 407 | { |
408 | // The child may have marked this expression as having an error. | |
409 | if (this->classification_ == EXPRESSION_ERROR) | |
ea664253 | 410 | return context->backend()->error_expression(); |
e440a328 | 411 | |
ea664253 | 412 | return this->do_get_backend(context); |
e440a328 | 413 | } |
414 | ||
48c2a53a | 415 | // Return a backend expression for VAL. |
416 | Bexpression* | |
417 | Expression::backend_numeric_constant_expression(Translate_context* context, | |
418 | Numeric_constant* val) | |
e440a328 | 419 | { |
48c2a53a | 420 | Gogo* gogo = context->gogo(); |
421 | Type* type = val->type(); | |
422 | if (type == NULL) | |
423 | return gogo->backend()->error_expression(); | |
e440a328 | 424 | |
48c2a53a | 425 | Btype* btype = type->get_backend(gogo); |
426 | Bexpression* ret; | |
427 | if (type->integer_type() != NULL) | |
e440a328 | 428 | { |
429 | mpz_t ival; | |
48c2a53a | 430 | if (!val->to_int(&ival)) |
431 | { | |
432 | go_assert(saw_errors()); | |
433 | return gogo->backend()->error_expression(); | |
434 | } | |
435 | ret = gogo->backend()->integer_constant_expression(btype, ival); | |
e440a328 | 436 | mpz_clear(ival); |
e440a328 | 437 | } |
48c2a53a | 438 | else if (type->float_type() != NULL) |
e440a328 | 439 | { |
48c2a53a | 440 | mpfr_t fval; |
441 | if (!val->to_float(&fval)) | |
442 | { | |
443 | go_assert(saw_errors()); | |
444 | return gogo->backend()->error_expression(); | |
445 | } | |
446 | ret = gogo->backend()->float_constant_expression(btype, fval); | |
447 | mpfr_clear(fval); | |
e440a328 | 448 | } |
48c2a53a | 449 | else if (type->complex_type() != NULL) |
e440a328 | 450 | { |
fcbea5e4 | 451 | mpc_t cval; |
452 | if (!val->to_complex(&cval)) | |
48c2a53a | 453 | { |
454 | go_assert(saw_errors()); | |
455 | return gogo->backend()->error_expression(); | |
456 | } | |
fcbea5e4 | 457 | ret = gogo->backend()->complex_constant_expression(btype, cval); |
458 | mpc_clear(cval); | |
e440a328 | 459 | } |
460 | else | |
c3e6f413 | 461 | go_unreachable(); |
e440a328 | 462 | |
48c2a53a | 463 | return ret; |
e440a328 | 464 | } |
465 | ||
2c809f8f | 466 | // Return an expression which evaluates to true if VAL, of arbitrary integer |
467 | // type, is negative or is more than the maximum value of the Go type "int". | |
e440a328 | 468 | |
2c809f8f | 469 | Expression* |
470 | Expression::check_bounds(Expression* val, Location loc) | |
e440a328 | 471 | { |
2c809f8f | 472 | Type* val_type = val->type(); |
473 | Type* bound_type = Type::lookup_integer_type("int"); | |
474 | ||
475 | int val_type_size; | |
476 | bool val_is_unsigned = false; | |
477 | if (val_type->integer_type() != NULL) | |
478 | { | |
479 | val_type_size = val_type->integer_type()->bits(); | |
480 | val_is_unsigned = val_type->integer_type()->is_unsigned(); | |
481 | } | |
482 | else | |
483 | { | |
484 | if (!val_type->is_numeric_type() | |
485 | || !Type::are_convertible(bound_type, val_type, NULL)) | |
486 | { | |
487 | go_assert(saw_errors()); | |
488 | return Expression::make_boolean(true, loc); | |
489 | } | |
e440a328 | 490 | |
2c809f8f | 491 | if (val_type->complex_type() != NULL) |
492 | val_type_size = val_type->complex_type()->bits(); | |
493 | else | |
494 | val_type_size = val_type->float_type()->bits(); | |
495 | } | |
496 | ||
497 | Expression* negative_index = Expression::make_boolean(false, loc); | |
498 | Expression* index_overflows = Expression::make_boolean(false, loc); | |
499 | if (!val_is_unsigned) | |
e440a328 | 500 | { |
e67508fa | 501 | Expression* zero = Expression::make_integer_ul(0, val_type, loc); |
2c809f8f | 502 | negative_index = Expression::make_binary(OPERATOR_LT, val, zero, loc); |
e440a328 | 503 | } |
504 | ||
2c809f8f | 505 | int bound_type_size = bound_type->integer_type()->bits(); |
c3068ac0 | 506 | if (val_type_size > bound_type_size |
507 | || (val_type_size == bound_type_size | |
2c809f8f | 508 | && val_is_unsigned)) |
509 | { | |
510 | mpz_t one; | |
511 | mpz_init_set_ui(one, 1UL); | |
512 | ||
513 | // maxval = 2^(bound_type_size - 1) - 1 | |
514 | mpz_t maxval; | |
515 | mpz_init(maxval); | |
516 | mpz_mul_2exp(maxval, one, bound_type_size - 1); | |
517 | mpz_sub_ui(maxval, maxval, 1); | |
e67508fa | 518 | Expression* max = Expression::make_integer_z(&maxval, val_type, loc); |
2c809f8f | 519 | mpz_clear(one); |
520 | mpz_clear(maxval); | |
521 | ||
522 | index_overflows = Expression::make_binary(OPERATOR_GT, val, max, loc); | |
e440a328 | 523 | } |
524 | ||
2c809f8f | 525 | return Expression::make_binary(OPERATOR_OROR, negative_index, index_overflows, |
526 | loc); | |
e440a328 | 527 | } |
528 | ||
d751bb78 | 529 | void |
530 | Expression::dump_expression(Ast_dump_context* ast_dump_context) const | |
531 | { | |
532 | this->do_dump_expression(ast_dump_context); | |
533 | } | |
534 | ||
e440a328 | 535 | // Error expressions. This are used to avoid cascading errors. |
536 | ||
537 | class Error_expression : public Expression | |
538 | { | |
539 | public: | |
b13c66cd | 540 | Error_expression(Location location) |
e440a328 | 541 | : Expression(EXPRESSION_ERROR, location) |
542 | { } | |
543 | ||
544 | protected: | |
545 | bool | |
546 | do_is_constant() const | |
547 | { return true; } | |
548 | ||
549 | bool | |
0c77715b | 550 | do_numeric_constant_value(Numeric_constant* nc) const |
e440a328 | 551 | { |
0c77715b | 552 | nc->set_unsigned_long(NULL, 0); |
e440a328 | 553 | return true; |
554 | } | |
555 | ||
4f2138d7 | 556 | bool |
e440a328 | 557 | do_discarding_value() |
4f2138d7 | 558 | { return true; } |
e440a328 | 559 | |
560 | Type* | |
561 | do_type() | |
562 | { return Type::make_error_type(); } | |
563 | ||
564 | void | |
565 | do_determine_type(const Type_context*) | |
566 | { } | |
567 | ||
568 | Expression* | |
569 | do_copy() | |
570 | { return this; } | |
571 | ||
572 | bool | |
573 | do_is_addressable() const | |
574 | { return true; } | |
575 | ||
ea664253 | 576 | Bexpression* |
577 | do_get_backend(Translate_context* context) | |
578 | { return context->backend()->error_expression(); } | |
d751bb78 | 579 | |
580 | void | |
581 | do_dump_expression(Ast_dump_context*) const; | |
e440a328 | 582 | }; |
583 | ||
d751bb78 | 584 | // Dump the ast representation for an error expression to a dump context. |
585 | ||
586 | void | |
587 | Error_expression::do_dump_expression(Ast_dump_context* ast_dump_context) const | |
588 | { | |
589 | ast_dump_context->ostream() << "_Error_" ; | |
590 | } | |
591 | ||
e440a328 | 592 | Expression* |
b13c66cd | 593 | Expression::make_error(Location location) |
e440a328 | 594 | { |
595 | return new Error_expression(location); | |
596 | } | |
597 | ||
598 | // An expression which is really a type. This is used during parsing. | |
599 | // It is an error if these survive after lowering. | |
600 | ||
601 | class | |
602 | Type_expression : public Expression | |
603 | { | |
604 | public: | |
b13c66cd | 605 | Type_expression(Type* type, Location location) |
e440a328 | 606 | : Expression(EXPRESSION_TYPE, location), |
607 | type_(type) | |
608 | { } | |
609 | ||
610 | protected: | |
611 | int | |
612 | do_traverse(Traverse* traverse) | |
613 | { return Type::traverse(this->type_, traverse); } | |
614 | ||
615 | Type* | |
616 | do_type() | |
617 | { return this->type_; } | |
618 | ||
619 | void | |
620 | do_determine_type(const Type_context*) | |
621 | { } | |
622 | ||
623 | void | |
624 | do_check_types(Gogo*) | |
625 | { this->report_error(_("invalid use of type")); } | |
626 | ||
627 | Expression* | |
628 | do_copy() | |
629 | { return this; } | |
630 | ||
ea664253 | 631 | Bexpression* |
632 | do_get_backend(Translate_context*) | |
c3e6f413 | 633 | { go_unreachable(); } |
e440a328 | 634 | |
d751bb78 | 635 | void do_dump_expression(Ast_dump_context*) const; |
636 | ||
e440a328 | 637 | private: |
638 | // The type which we are representing as an expression. | |
639 | Type* type_; | |
640 | }; | |
641 | ||
d751bb78 | 642 | void |
643 | Type_expression::do_dump_expression(Ast_dump_context* ast_dump_context) const | |
644 | { | |
645 | ast_dump_context->dump_type(this->type_); | |
646 | } | |
647 | ||
e440a328 | 648 | Expression* |
b13c66cd | 649 | Expression::make_type(Type* type, Location location) |
e440a328 | 650 | { |
651 | return new Type_expression(type, location); | |
652 | } | |
653 | ||
e03bdf36 | 654 | // Class Parser_expression. |
655 | ||
656 | Type* | |
657 | Parser_expression::do_type() | |
658 | { | |
659 | // We should never really ask for the type of a Parser_expression. | |
660 | // However, it can happen, at least when we have an invalid const | |
661 | // whose initializer refers to the const itself. In that case we | |
662 | // may ask for the type when lowering the const itself. | |
c484d925 | 663 | go_assert(saw_errors()); |
e03bdf36 | 664 | return Type::make_error_type(); |
665 | } | |
666 | ||
e440a328 | 667 | // Class Var_expression. |
668 | ||
669 | // Lower a variable expression. Here we just make sure that the | |
670 | // initialization expression of the variable has been lowered. This | |
671 | // ensures that we will be able to determine the type of the variable | |
672 | // if necessary. | |
673 | ||
674 | Expression* | |
ceeb4318 | 675 | Var_expression::do_lower(Gogo* gogo, Named_object* function, |
676 | Statement_inserter* inserter, int) | |
e440a328 | 677 | { |
678 | if (this->variable_->is_variable()) | |
679 | { | |
680 | Variable* var = this->variable_->var_value(); | |
681 | // This is either a local variable or a global variable. A | |
682 | // reference to a variable which is local to an enclosing | |
683 | // function will be a reference to a field in a closure. | |
684 | if (var->is_global()) | |
ceeb4318 | 685 | { |
686 | function = NULL; | |
687 | inserter = NULL; | |
688 | } | |
689 | var->lower_init_expression(gogo, function, inserter); | |
e440a328 | 690 | } |
691 | return this; | |
692 | } | |
693 | ||
e440a328 | 694 | // Return the type of a reference to a variable. |
695 | ||
696 | Type* | |
697 | Var_expression::do_type() | |
698 | { | |
699 | if (this->variable_->is_variable()) | |
700 | return this->variable_->var_value()->type(); | |
701 | else if (this->variable_->is_result_variable()) | |
702 | return this->variable_->result_var_value()->type(); | |
703 | else | |
c3e6f413 | 704 | go_unreachable(); |
e440a328 | 705 | } |
706 | ||
0ab09e06 | 707 | // Determine the type of a reference to a variable. |
708 | ||
709 | void | |
710 | Var_expression::do_determine_type(const Type_context*) | |
711 | { | |
712 | if (this->variable_->is_variable()) | |
713 | this->variable_->var_value()->determine_type(); | |
714 | } | |
715 | ||
e440a328 | 716 | // Something takes the address of this variable. This means that we |
717 | // may want to move the variable onto the heap. | |
718 | ||
719 | void | |
720 | Var_expression::do_address_taken(bool escapes) | |
721 | { | |
722 | if (!escapes) | |
f325319b | 723 | { |
724 | if (this->variable_->is_variable()) | |
725 | this->variable_->var_value()->set_non_escaping_address_taken(); | |
726 | else if (this->variable_->is_result_variable()) | |
727 | this->variable_->result_var_value()->set_non_escaping_address_taken(); | |
728 | else | |
729 | go_unreachable(); | |
730 | } | |
e440a328 | 731 | else |
f325319b | 732 | { |
733 | if (this->variable_->is_variable()) | |
734 | this->variable_->var_value()->set_address_taken(); | |
735 | else if (this->variable_->is_result_variable()) | |
736 | this->variable_->result_var_value()->set_address_taken(); | |
737 | else | |
738 | go_unreachable(); | |
739 | } | |
45ff893b | 740 | |
741 | if (this->variable_->is_variable() | |
742 | && this->variable_->var_value()->is_in_heap()) | |
743 | { | |
744 | Node::make_node(this)->set_encoding(Node::ESCAPE_HEAP); | |
745 | Node::make_node(this->variable_)->set_encoding(Node::ESCAPE_HEAP); | |
746 | } | |
e440a328 | 747 | } |
748 | ||
ea664253 | 749 | // Get the backend representation for a reference to a variable. |
e440a328 | 750 | |
ea664253 | 751 | Bexpression* |
752 | Var_expression::do_get_backend(Translate_context* context) | |
e440a328 | 753 | { |
fe2f84cf | 754 | Bvariable* bvar = this->variable_->get_backend_variable(context->gogo(), |
755 | context->function()); | |
fe2f84cf | 756 | bool is_in_heap; |
c6777780 | 757 | Location loc = this->location(); |
9b27b43c | 758 | Btype* btype; |
759 | Gogo* gogo = context->gogo(); | |
fe2f84cf | 760 | if (this->variable_->is_variable()) |
9b27b43c | 761 | { |
762 | is_in_heap = this->variable_->var_value()->is_in_heap(); | |
763 | btype = this->variable_->var_value()->type()->get_backend(gogo); | |
764 | } | |
fe2f84cf | 765 | else if (this->variable_->is_result_variable()) |
9b27b43c | 766 | { |
767 | is_in_heap = this->variable_->result_var_value()->is_in_heap(); | |
768 | btype = this->variable_->result_var_value()->type()->get_backend(gogo); | |
769 | } | |
fe2f84cf | 770 | else |
c3e6f413 | 771 | go_unreachable(); |
c6777780 | 772 | |
d4e6573e | 773 | Bexpression* ret = |
774 | context->backend()->var_expression(bvar, this->in_lvalue_pos_, loc); | |
fe2f84cf | 775 | if (is_in_heap) |
9b27b43c | 776 | ret = context->backend()->indirect_expression(btype, ret, true, loc); |
ea664253 | 777 | return ret; |
e440a328 | 778 | } |
779 | ||
d751bb78 | 780 | // Ast dump for variable expression. |
781 | ||
782 | void | |
783 | Var_expression::do_dump_expression(Ast_dump_context* ast_dump_context) const | |
784 | { | |
785 | ast_dump_context->ostream() << this->variable_->name() ; | |
786 | } | |
787 | ||
e440a328 | 788 | // Make a reference to a variable in an expression. |
789 | ||
790 | Expression* | |
b13c66cd | 791 | Expression::make_var_reference(Named_object* var, Location location) |
e440a328 | 792 | { |
793 | if (var->is_sink()) | |
794 | return Expression::make_sink(location); | |
795 | ||
796 | // FIXME: Creating a new object for each reference to a variable is | |
797 | // wasteful. | |
798 | return new Var_expression(var, location); | |
799 | } | |
800 | ||
b0c09712 | 801 | // Class Enclosed_var_expression. |
802 | ||
803 | int | |
804 | Enclosed_var_expression::do_traverse(Traverse*) | |
805 | { | |
806 | return TRAVERSE_CONTINUE; | |
807 | } | |
808 | ||
809 | // Lower the reference to the enclosed variable. | |
810 | ||
811 | Expression* | |
812 | Enclosed_var_expression::do_lower(Gogo* gogo, Named_object* function, | |
813 | Statement_inserter* inserter, int) | |
814 | { | |
815 | gogo->lower_expression(function, inserter, &this->reference_); | |
816 | return this; | |
817 | } | |
818 | ||
819 | // Flatten the reference to the enclosed variable. | |
820 | ||
821 | Expression* | |
822 | Enclosed_var_expression::do_flatten(Gogo* gogo, Named_object* function, | |
823 | Statement_inserter* inserter) | |
824 | { | |
825 | gogo->flatten_expression(function, inserter, &this->reference_); | |
826 | return this; | |
827 | } | |
828 | ||
829 | void | |
830 | Enclosed_var_expression::do_address_taken(bool escapes) | |
831 | { | |
832 | if (!escapes) | |
833 | { | |
834 | if (this->variable_->is_variable()) | |
835 | this->variable_->var_value()->set_non_escaping_address_taken(); | |
836 | else if (this->variable_->is_result_variable()) | |
837 | this->variable_->result_var_value()->set_non_escaping_address_taken(); | |
838 | else | |
839 | go_unreachable(); | |
840 | } | |
841 | else | |
842 | { | |
843 | if (this->variable_->is_variable()) | |
844 | this->variable_->var_value()->set_address_taken(); | |
845 | else if (this->variable_->is_result_variable()) | |
846 | this->variable_->result_var_value()->set_address_taken(); | |
847 | else | |
848 | go_unreachable(); | |
849 | } | |
45ff893b | 850 | |
851 | if (this->variable_->is_variable() | |
852 | && this->variable_->var_value()->is_in_heap()) | |
853 | Node::make_node(this->variable_)->set_encoding(Node::ESCAPE_HEAP); | |
b0c09712 | 854 | } |
855 | ||
856 | // Ast dump for enclosed variable expression. | |
857 | ||
858 | void | |
859 | Enclosed_var_expression::do_dump_expression(Ast_dump_context* adc) const | |
860 | { | |
861 | adc->ostream() << this->variable_->name(); | |
862 | } | |
863 | ||
864 | // Make a reference to a variable within an enclosing function. | |
865 | ||
866 | Expression* | |
867 | Expression::make_enclosing_var_reference(Expression* reference, | |
868 | Named_object* var, Location location) | |
869 | { | |
870 | return new Enclosed_var_expression(reference, var, location); | |
871 | } | |
872 | ||
e440a328 | 873 | // Class Temporary_reference_expression. |
874 | ||
875 | // The type. | |
876 | ||
877 | Type* | |
878 | Temporary_reference_expression::do_type() | |
879 | { | |
880 | return this->statement_->type(); | |
881 | } | |
882 | ||
883 | // Called if something takes the address of this temporary variable. | |
884 | // We never have to move temporary variables to the heap, but we do | |
885 | // need to know that they must live in the stack rather than in a | |
886 | // register. | |
887 | ||
888 | void | |
889 | Temporary_reference_expression::do_address_taken(bool) | |
890 | { | |
891 | this->statement_->set_is_address_taken(); | |
892 | } | |
893 | ||
ea664253 | 894 | // Get a backend expression referring to the variable. |
e440a328 | 895 | |
ea664253 | 896 | Bexpression* |
897 | Temporary_reference_expression::do_get_backend(Translate_context* context) | |
e440a328 | 898 | { |
cd440cff | 899 | Gogo* gogo = context->gogo(); |
eefc1ed3 | 900 | Bvariable* bvar = this->statement_->get_backend_variable(context); |
d4e6573e | 901 | Varexpr_context ve_ctxt = (this->is_lvalue_ ? VE_lvalue : VE_rvalue); |
902 | ||
903 | Bexpression* ret = gogo->backend()->var_expression(bvar, ve_ctxt, | |
904 | this->location()); | |
eefc1ed3 | 905 | |
cd440cff | 906 | // The backend can't always represent the same set of recursive types |
eefc1ed3 | 907 | // that the Go frontend can. In some cases this means that a |
908 | // temporary variable won't have the right backend type. Correct | |
909 | // that here by adding a type cast. We need to use base() to push | |
910 | // the circularity down one level. | |
cd440cff | 911 | Type* stype = this->statement_->type(); |
ceeb4318 | 912 | if (!this->is_lvalue_ |
03118c21 | 913 | && stype->points_to() != NULL |
914 | && stype->points_to()->is_void_type()) | |
eefc1ed3 | 915 | { |
cd440cff | 916 | Btype* btype = this->type()->base()->get_backend(gogo); |
917 | ret = gogo->backend()->convert_expression(btype, ret, this->location()); | |
eefc1ed3 | 918 | } |
ea664253 | 919 | return ret; |
e440a328 | 920 | } |
921 | ||
d751bb78 | 922 | // Ast dump for temporary reference. |
923 | ||
924 | void | |
925 | Temporary_reference_expression::do_dump_expression( | |
926 | Ast_dump_context* ast_dump_context) const | |
927 | { | |
928 | ast_dump_context->dump_temp_variable_name(this->statement_); | |
929 | } | |
930 | ||
e440a328 | 931 | // Make a reference to a temporary variable. |
932 | ||
ceeb4318 | 933 | Temporary_reference_expression* |
e440a328 | 934 | Expression::make_temporary_reference(Temporary_statement* statement, |
b13c66cd | 935 | Location location) |
e440a328 | 936 | { |
937 | return new Temporary_reference_expression(statement, location); | |
938 | } | |
939 | ||
e9d3367e | 940 | // Class Set_and_use_temporary_expression. |
941 | ||
942 | // Return the type. | |
943 | ||
944 | Type* | |
945 | Set_and_use_temporary_expression::do_type() | |
946 | { | |
947 | return this->statement_->type(); | |
948 | } | |
949 | ||
0afbb937 | 950 | // Determine the type of the expression. |
951 | ||
952 | void | |
953 | Set_and_use_temporary_expression::do_determine_type( | |
954 | const Type_context* context) | |
955 | { | |
956 | this->expr_->determine_type(context); | |
957 | } | |
958 | ||
e9d3367e | 959 | // Take the address. |
960 | ||
961 | void | |
962 | Set_and_use_temporary_expression::do_address_taken(bool) | |
963 | { | |
964 | this->statement_->set_is_address_taken(); | |
965 | } | |
966 | ||
967 | // Return the backend representation. | |
968 | ||
ea664253 | 969 | Bexpression* |
970 | Set_and_use_temporary_expression::do_get_backend(Translate_context* context) | |
e9d3367e | 971 | { |
e9d3367e | 972 | Location loc = this->location(); |
a302c105 | 973 | Gogo* gogo = context->gogo(); |
974 | Bvariable* bvar = this->statement_->get_backend_variable(context); | |
26caae14 | 975 | Bexpression* lvar_ref = gogo->backend()->var_expression(bvar, VE_lvalue, loc); |
a302c105 | 976 | |
0ab48656 | 977 | Named_object* fn = context->function(); |
978 | go_assert(fn != NULL); | |
979 | Bfunction* bfn = fn->func_value()->get_or_make_decl(gogo, fn); | |
ea664253 | 980 | Bexpression* bexpr = this->expr_->get_backend(context); |
0ab48656 | 981 | Bstatement* set = gogo->backend()->assignment_statement(bfn, lvar_ref, |
982 | bexpr, loc); | |
26caae14 | 983 | Bexpression* var_ref = gogo->backend()->var_expression(bvar, VE_rvalue, loc); |
a302c105 | 984 | Bexpression* ret = gogo->backend()->compound_expression(set, var_ref, loc); |
ea664253 | 985 | return ret; |
e9d3367e | 986 | } |
987 | ||
988 | // Dump. | |
989 | ||
990 | void | |
991 | Set_and_use_temporary_expression::do_dump_expression( | |
992 | Ast_dump_context* ast_dump_context) const | |
993 | { | |
994 | ast_dump_context->ostream() << '('; | |
995 | ast_dump_context->dump_temp_variable_name(this->statement_); | |
996 | ast_dump_context->ostream() << " = "; | |
997 | this->expr_->dump_expression(ast_dump_context); | |
998 | ast_dump_context->ostream() << ')'; | |
999 | } | |
1000 | ||
1001 | // Make a set-and-use temporary. | |
1002 | ||
1003 | Set_and_use_temporary_expression* | |
1004 | Expression::make_set_and_use_temporary(Temporary_statement* statement, | |
1005 | Expression* expr, Location location) | |
1006 | { | |
1007 | return new Set_and_use_temporary_expression(statement, expr, location); | |
1008 | } | |
1009 | ||
e440a328 | 1010 | // A sink expression--a use of the blank identifier _. |
1011 | ||
1012 | class Sink_expression : public Expression | |
1013 | { | |
1014 | public: | |
b13c66cd | 1015 | Sink_expression(Location location) |
e440a328 | 1016 | : Expression(EXPRESSION_SINK, location), |
aa93217a | 1017 | type_(NULL), bvar_(NULL) |
e440a328 | 1018 | { } |
1019 | ||
1020 | protected: | |
4f2138d7 | 1021 | bool |
e440a328 | 1022 | do_discarding_value() |
4f2138d7 | 1023 | { return true; } |
e440a328 | 1024 | |
1025 | Type* | |
1026 | do_type(); | |
1027 | ||
1028 | void | |
1029 | do_determine_type(const Type_context*); | |
1030 | ||
1031 | Expression* | |
1032 | do_copy() | |
1033 | { return new Sink_expression(this->location()); } | |
1034 | ||
ea664253 | 1035 | Bexpression* |
1036 | do_get_backend(Translate_context*); | |
e440a328 | 1037 | |
d751bb78 | 1038 | void |
1039 | do_dump_expression(Ast_dump_context*) const; | |
1040 | ||
e440a328 | 1041 | private: |
1042 | // The type of this sink variable. | |
1043 | Type* type_; | |
1044 | // The temporary variable we generate. | |
aa93217a | 1045 | Bvariable* bvar_; |
e440a328 | 1046 | }; |
1047 | ||
1048 | // Return the type of a sink expression. | |
1049 | ||
1050 | Type* | |
1051 | Sink_expression::do_type() | |
1052 | { | |
1053 | if (this->type_ == NULL) | |
1054 | return Type::make_sink_type(); | |
1055 | return this->type_; | |
1056 | } | |
1057 | ||
1058 | // Determine the type of a sink expression. | |
1059 | ||
1060 | void | |
1061 | Sink_expression::do_determine_type(const Type_context* context) | |
1062 | { | |
1063 | if (context->type != NULL) | |
1064 | this->type_ = context->type; | |
1065 | } | |
1066 | ||
1067 | // Return a temporary variable for a sink expression. This will | |
1068 | // presumably be a write-only variable which the middle-end will drop. | |
1069 | ||
ea664253 | 1070 | Bexpression* |
1071 | Sink_expression::do_get_backend(Translate_context* context) | |
e440a328 | 1072 | { |
aa93217a | 1073 | Location loc = this->location(); |
1074 | Gogo* gogo = context->gogo(); | |
1075 | if (this->bvar_ == NULL) | |
e440a328 | 1076 | { |
c484d925 | 1077 | go_assert(this->type_ != NULL && !this->type_->is_sink_type()); |
aa93217a | 1078 | Named_object* fn = context->function(); |
1079 | go_assert(fn != NULL); | |
1080 | Bfunction* fn_ctx = fn->func_value()->get_or_make_decl(gogo, fn); | |
9f0e0513 | 1081 | Btype* bt = this->type_->get_backend(context->gogo()); |
aa93217a | 1082 | Bstatement* decl; |
1083 | this->bvar_ = | |
1084 | gogo->backend()->temporary_variable(fn_ctx, context->bblock(), bt, NULL, | |
1085 | false, loc, &decl); | |
d4e6573e | 1086 | Bexpression* var_ref = |
1087 | gogo->backend()->var_expression(this->bvar_, VE_lvalue, loc); | |
aa93217a | 1088 | var_ref = gogo->backend()->compound_expression(decl, var_ref, loc); |
ea664253 | 1089 | return var_ref; |
e440a328 | 1090 | } |
d4e6573e | 1091 | return gogo->backend()->var_expression(this->bvar_, VE_lvalue, loc); |
e440a328 | 1092 | } |
1093 | ||
d751bb78 | 1094 | // Ast dump for sink expression. |
1095 | ||
1096 | void | |
1097 | Sink_expression::do_dump_expression(Ast_dump_context* ast_dump_context) const | |
1098 | { | |
1099 | ast_dump_context->ostream() << "_" ; | |
1100 | } | |
1101 | ||
e440a328 | 1102 | // Make a sink expression. |
1103 | ||
1104 | Expression* | |
b13c66cd | 1105 | Expression::make_sink(Location location) |
e440a328 | 1106 | { |
1107 | return new Sink_expression(location); | |
1108 | } | |
1109 | ||
1110 | // Class Func_expression. | |
1111 | ||
1112 | // FIXME: Can a function expression appear in a constant expression? | |
1113 | // The value is unchanging. Initializing a constant to the address of | |
1114 | // a function seems like it could work, though there might be little | |
1115 | // point to it. | |
1116 | ||
e440a328 | 1117 | // Traversal. |
1118 | ||
1119 | int | |
1120 | Func_expression::do_traverse(Traverse* traverse) | |
1121 | { | |
1122 | return (this->closure_ == NULL | |
1123 | ? TRAVERSE_CONTINUE | |
1124 | : Expression::traverse(&this->closure_, traverse)); | |
1125 | } | |
1126 | ||
1127 | // Return the type of a function expression. | |
1128 | ||
1129 | Type* | |
1130 | Func_expression::do_type() | |
1131 | { | |
1132 | if (this->function_->is_function()) | |
1133 | return this->function_->func_value()->type(); | |
1134 | else if (this->function_->is_function_declaration()) | |
1135 | return this->function_->func_declaration_value()->type(); | |
1136 | else | |
c3e6f413 | 1137 | go_unreachable(); |
e440a328 | 1138 | } |
1139 | ||
ea664253 | 1140 | // Get the backend representation for the code of a function expression. |
e440a328 | 1141 | |
97267c39 | 1142 | Bexpression* |
8381eda7 | 1143 | Func_expression::get_code_pointer(Gogo* gogo, Named_object* no, Location loc) |
e440a328 | 1144 | { |
1145 | Function_type* fntype; | |
8381eda7 | 1146 | if (no->is_function()) |
1147 | fntype = no->func_value()->type(); | |
1148 | else if (no->is_function_declaration()) | |
1149 | fntype = no->func_declaration_value()->type(); | |
e440a328 | 1150 | else |
c3e6f413 | 1151 | go_unreachable(); |
e440a328 | 1152 | |
1153 | // Builtin functions are handled specially by Call_expression. We | |
1154 | // can't take their address. | |
1155 | if (fntype->is_builtin()) | |
1156 | { | |
631d5788 | 1157 | go_error_at(loc, |
1158 | "invalid use of special builtin function %qs; must be called", | |
1159 | no->message_name().c_str()); | |
97267c39 | 1160 | return gogo->backend()->error_expression(); |
e440a328 | 1161 | } |
1162 | ||
97267c39 | 1163 | Bfunction* fndecl; |
e440a328 | 1164 | if (no->is_function()) |
cf3cae55 | 1165 | fndecl = no->func_value()->get_or_make_decl(gogo, no); |
e440a328 | 1166 | else if (no->is_function_declaration()) |
cf3cae55 | 1167 | fndecl = no->func_declaration_value()->get_or_make_decl(gogo, no); |
e440a328 | 1168 | else |
c3e6f413 | 1169 | go_unreachable(); |
e440a328 | 1170 | |
97267c39 | 1171 | return gogo->backend()->function_code_expression(fndecl, loc); |
e440a328 | 1172 | } |
1173 | ||
ea664253 | 1174 | // Get the backend representation for a function expression. This is used when |
1175 | // we take the address of a function rather than simply calling it. A func | |
8381eda7 | 1176 | // value is represented as a pointer to a block of memory. The first |
1177 | // word of that memory is a pointer to the function code. The | |
1178 | // remaining parts of that memory are the addresses of variables that | |
1179 | // the function closes over. | |
e440a328 | 1180 | |
ea664253 | 1181 | Bexpression* |
1182 | Func_expression::do_get_backend(Translate_context* context) | |
e440a328 | 1183 | { |
8381eda7 | 1184 | // If there is no closure, just use the function descriptor. |
2010c17a | 1185 | if (this->closure_ == NULL) |
8381eda7 | 1186 | { |
1187 | Gogo* gogo = context->gogo(); | |
1188 | Named_object* no = this->function_; | |
1189 | Expression* descriptor; | |
1190 | if (no->is_function()) | |
1191 | descriptor = no->func_value()->descriptor(gogo, no); | |
1192 | else if (no->is_function_declaration()) | |
1193 | { | |
1194 | if (no->func_declaration_value()->type()->is_builtin()) | |
1195 | { | |
631d5788 | 1196 | go_error_at(this->location(), |
1197 | ("invalid use of special builtin function %qs; " | |
1198 | "must be called"), | |
1199 | no->message_name().c_str()); | |
ea664253 | 1200 | return gogo->backend()->error_expression(); |
8381eda7 | 1201 | } |
1202 | descriptor = no->func_declaration_value()->descriptor(gogo, no); | |
1203 | } | |
1204 | else | |
1205 | go_unreachable(); | |
2010c17a | 1206 | |
ea664253 | 1207 | Bexpression* bdesc = descriptor->get_backend(context); |
1208 | return gogo->backend()->address_expression(bdesc, this->location()); | |
8381eda7 | 1209 | } |
e440a328 | 1210 | |
8381eda7 | 1211 | go_assert(this->function_->func_value()->enclosing() != NULL); |
e440a328 | 1212 | |
8381eda7 | 1213 | // If there is a closure, then the closure is itself the function |
1214 | // expression. It is a pointer to a struct whose first field points | |
1215 | // to the function code and whose remaining fields are the addresses | |
1216 | // of the closed-over variables. | |
76818e19 | 1217 | Bexpression *bexpr = this->closure_->get_backend(context); |
1218 | ||
1219 | // Introduce a backend type conversion, to account for any differences | |
1220 | // between the argument type (function descriptor, struct with a | |
1221 | // single field) and the closure (struct with multiple fields). | |
1222 | Gogo* gogo = context->gogo(); | |
1223 | Btype *btype = this->type()->get_backend(gogo); | |
1224 | return gogo->backend()->convert_expression(btype, bexpr, this->location()); | |
e440a328 | 1225 | } |
1226 | ||
d751bb78 | 1227 | // Ast dump for function. |
1228 | ||
1229 | void | |
1230 | Func_expression::do_dump_expression(Ast_dump_context* ast_dump_context) const | |
1231 | { | |
8b1c301d | 1232 | ast_dump_context->ostream() << this->function_->name(); |
1233 | if (this->closure_ != NULL) | |
1234 | { | |
1235 | ast_dump_context->ostream() << " {closure = "; | |
1236 | this->closure_->dump_expression(ast_dump_context); | |
1237 | ast_dump_context->ostream() << "}"; | |
1238 | } | |
d751bb78 | 1239 | } |
1240 | ||
e440a328 | 1241 | // Make a reference to a function in an expression. |
1242 | ||
1243 | Expression* | |
1244 | Expression::make_func_reference(Named_object* function, Expression* closure, | |
b13c66cd | 1245 | Location location) |
e440a328 | 1246 | { |
b1d7ecfa | 1247 | Func_expression* fe = new Func_expression(function, closure, location); |
1248 | ||
1249 | // Detect references to builtin functions and set the runtime code if | |
1250 | // appropriate. | |
1251 | if (function->is_function_declaration()) | |
1252 | fe->set_runtime_code(Runtime::name_to_code(function->name())); | |
1253 | return fe; | |
e440a328 | 1254 | } |
1255 | ||
c6837989 | 1256 | // Class Func_descriptor_expression. |
8381eda7 | 1257 | |
c6837989 | 1258 | // Constructor. |
8381eda7 | 1259 | |
c6837989 | 1260 | Func_descriptor_expression::Func_descriptor_expression(Named_object* fn) |
1261 | : Expression(EXPRESSION_FUNC_DESCRIPTOR, fn->location()), | |
f8bdf81a | 1262 | fn_(fn), dvar_(NULL) |
c6837989 | 1263 | { |
1264 | go_assert(!fn->is_function() || !fn->func_value()->needs_closure()); | |
1265 | } | |
8381eda7 | 1266 | |
c6837989 | 1267 | // Traversal. |
8381eda7 | 1268 | |
c6837989 | 1269 | int |
1270 | Func_descriptor_expression::do_traverse(Traverse*) | |
1271 | { | |
1272 | return TRAVERSE_CONTINUE; | |
1273 | } | |
8381eda7 | 1274 | |
1275 | // All function descriptors have the same type. | |
1276 | ||
1277 | Type* Func_descriptor_expression::descriptor_type; | |
1278 | ||
1279 | void | |
1280 | Func_descriptor_expression::make_func_descriptor_type() | |
1281 | { | |
1282 | if (Func_descriptor_expression::descriptor_type != NULL) | |
1283 | return; | |
1284 | Type* uintptr_type = Type::lookup_integer_type("uintptr"); | |
1285 | Type* struct_type = Type::make_builtin_struct_type(1, "code", uintptr_type); | |
1286 | Func_descriptor_expression::descriptor_type = | |
1287 | Type::make_builtin_named_type("functionDescriptor", struct_type); | |
1288 | } | |
1289 | ||
1290 | Type* | |
1291 | Func_descriptor_expression::do_type() | |
1292 | { | |
1293 | Func_descriptor_expression::make_func_descriptor_type(); | |
1294 | return Func_descriptor_expression::descriptor_type; | |
1295 | } | |
1296 | ||
ea664253 | 1297 | // The backend representation for a function descriptor. |
8381eda7 | 1298 | |
ea664253 | 1299 | Bexpression* |
1300 | Func_descriptor_expression::do_get_backend(Translate_context* context) | |
8381eda7 | 1301 | { |
8381eda7 | 1302 | Named_object* no = this->fn_; |
1303 | Location loc = no->location(); | |
ea664253 | 1304 | if (this->dvar_ != NULL) |
d4e6573e | 1305 | return context->backend()->var_expression(this->dvar_, VE_rvalue, loc); |
8381eda7 | 1306 | |
ea664253 | 1307 | Gogo* gogo = context->gogo(); |
19272321 | 1308 | std::string var_name(gogo->function_descriptor_name(no)); |
09e57698 | 1309 | bool is_descriptor = false; |
1310 | if (no->is_function_declaration() | |
1311 | && !no->func_declaration_value()->asm_name().empty() | |
1312 | && Linemap::is_predeclared_location(no->location())) | |
19272321 | 1313 | is_descriptor = true; |
8381eda7 | 1314 | |
1315 | Btype* btype = this->type()->get_backend(gogo); | |
1316 | ||
1317 | Bvariable* bvar; | |
438b4bec | 1318 | std::string asm_name(go_selectively_encode_id(var_name)); |
09e57698 | 1319 | if (no->package() != NULL || is_descriptor) |
438b4bec | 1320 | bvar = context->backend()->immutable_struct_reference(var_name, asm_name, |
1321 | btype, loc); | |
8381eda7 | 1322 | else |
1323 | { | |
1324 | Location bloc = Linemap::predeclared_location(); | |
1325 | bool is_hidden = ((no->is_function() | |
1326 | && no->func_value()->enclosing() != NULL) | |
1327 | || Gogo::is_thunk(no)); | |
438b4bec | 1328 | bvar = context->backend()->immutable_struct(var_name, asm_name, |
1329 | is_hidden, false, | |
8381eda7 | 1330 | btype, bloc); |
1331 | Expression_list* vals = new Expression_list(); | |
f8bdf81a | 1332 | vals->push_back(Expression::make_func_code_reference(this->fn_, bloc)); |
8381eda7 | 1333 | Expression* init = |
1334 | Expression::make_struct_composite_literal(this->type(), vals, bloc); | |
1335 | Translate_context bcontext(gogo, NULL, NULL, NULL); | |
1336 | bcontext.set_is_const(); | |
ea664253 | 1337 | Bexpression* binit = init->get_backend(&bcontext); |
8381eda7 | 1338 | context->backend()->immutable_struct_set_init(bvar, var_name, is_hidden, |
1339 | false, btype, bloc, binit); | |
1340 | } | |
1341 | ||
1342 | this->dvar_ = bvar; | |
d4e6573e | 1343 | return gogo->backend()->var_expression(bvar, VE_rvalue, loc); |
8381eda7 | 1344 | } |
1345 | ||
c6837989 | 1346 | // Print a function descriptor expression. |
1347 | ||
1348 | void | |
1349 | Func_descriptor_expression::do_dump_expression(Ast_dump_context* context) const | |
1350 | { | |
1351 | context->ostream() << "[descriptor " << this->fn_->name() << "]"; | |
1352 | } | |
1353 | ||
8381eda7 | 1354 | // Make a function descriptor expression. |
1355 | ||
c6837989 | 1356 | Func_descriptor_expression* |
1357 | Expression::make_func_descriptor(Named_object* fn) | |
8381eda7 | 1358 | { |
c6837989 | 1359 | return new Func_descriptor_expression(fn); |
8381eda7 | 1360 | } |
1361 | ||
1362 | // Make the function descriptor type, so that it can be converted. | |
1363 | ||
1364 | void | |
1365 | Expression::make_func_descriptor_type() | |
1366 | { | |
1367 | Func_descriptor_expression::make_func_descriptor_type(); | |
1368 | } | |
1369 | ||
1370 | // A reference to just the code of a function. | |
1371 | ||
1372 | class Func_code_reference_expression : public Expression | |
1373 | { | |
1374 | public: | |
1375 | Func_code_reference_expression(Named_object* function, Location location) | |
1376 | : Expression(EXPRESSION_FUNC_CODE_REFERENCE, location), | |
1377 | function_(function) | |
1378 | { } | |
1379 | ||
1380 | protected: | |
1381 | int | |
1382 | do_traverse(Traverse*) | |
1383 | { return TRAVERSE_CONTINUE; } | |
1384 | ||
f9ca30f9 | 1385 | bool |
3ae06f68 | 1386 | do_is_static_initializer() const |
f9ca30f9 | 1387 | { return true; } |
1388 | ||
8381eda7 | 1389 | Type* |
1390 | do_type() | |
1391 | { return Type::make_pointer_type(Type::make_void_type()); } | |
1392 | ||
1393 | void | |
1394 | do_determine_type(const Type_context*) | |
1395 | { } | |
1396 | ||
1397 | Expression* | |
1398 | do_copy() | |
1399 | { | |
1400 | return Expression::make_func_code_reference(this->function_, | |
1401 | this->location()); | |
1402 | } | |
1403 | ||
ea664253 | 1404 | Bexpression* |
1405 | do_get_backend(Translate_context*); | |
8381eda7 | 1406 | |
1407 | void | |
1408 | do_dump_expression(Ast_dump_context* context) const | |
1409 | { context->ostream() << "[raw " << this->function_->name() << "]" ; } | |
1410 | ||
1411 | private: | |
1412 | // The function. | |
1413 | Named_object* function_; | |
1414 | }; | |
1415 | ||
ea664253 | 1416 | // Get the backend representation for a reference to function code. |
8381eda7 | 1417 | |
ea664253 | 1418 | Bexpression* |
1419 | Func_code_reference_expression::do_get_backend(Translate_context* context) | |
8381eda7 | 1420 | { |
ea664253 | 1421 | return Func_expression::get_code_pointer(context->gogo(), this->function_, |
1422 | this->location()); | |
8381eda7 | 1423 | } |
1424 | ||
1425 | // Make a reference to the code of a function. | |
1426 | ||
1427 | Expression* | |
1428 | Expression::make_func_code_reference(Named_object* function, Location location) | |
1429 | { | |
1430 | return new Func_code_reference_expression(function, location); | |
1431 | } | |
1432 | ||
e440a328 | 1433 | // Class Unknown_expression. |
1434 | ||
1435 | // Return the name of an unknown expression. | |
1436 | ||
1437 | const std::string& | |
1438 | Unknown_expression::name() const | |
1439 | { | |
1440 | return this->named_object_->name(); | |
1441 | } | |
1442 | ||
1443 | // Lower a reference to an unknown name. | |
1444 | ||
1445 | Expression* | |
ceeb4318 | 1446 | Unknown_expression::do_lower(Gogo*, Named_object*, Statement_inserter*, int) |
e440a328 | 1447 | { |
b13c66cd | 1448 | Location location = this->location(); |
e440a328 | 1449 | Named_object* no = this->named_object_; |
deded542 | 1450 | Named_object* real; |
1451 | if (!no->is_unknown()) | |
1452 | real = no; | |
1453 | else | |
e440a328 | 1454 | { |
deded542 | 1455 | real = no->unknown_value()->real_named_object(); |
1456 | if (real == NULL) | |
1457 | { | |
1458 | if (this->is_composite_literal_key_) | |
1459 | return this; | |
acf8e158 | 1460 | if (!this->no_error_message_) |
631d5788 | 1461 | go_error_at(location, "reference to undefined name %qs", |
1462 | this->named_object_->message_name().c_str()); | |
deded542 | 1463 | return Expression::make_error(location); |
1464 | } | |
e440a328 | 1465 | } |
1466 | switch (real->classification()) | |
1467 | { | |
1468 | case Named_object::NAMED_OBJECT_CONST: | |
1469 | return Expression::make_const_reference(real, location); | |
1470 | case Named_object::NAMED_OBJECT_TYPE: | |
1471 | return Expression::make_type(real->type_value(), location); | |
1472 | case Named_object::NAMED_OBJECT_TYPE_DECLARATION: | |
1473 | if (this->is_composite_literal_key_) | |
1474 | return this; | |
acf8e158 | 1475 | if (!this->no_error_message_) |
631d5788 | 1476 | go_error_at(location, "reference to undefined type %qs", |
1477 | real->message_name().c_str()); | |
e440a328 | 1478 | return Expression::make_error(location); |
1479 | case Named_object::NAMED_OBJECT_VAR: | |
7d834090 | 1480 | real->var_value()->set_is_used(); |
e440a328 | 1481 | return Expression::make_var_reference(real, location); |
1482 | case Named_object::NAMED_OBJECT_FUNC: | |
1483 | case Named_object::NAMED_OBJECT_FUNC_DECLARATION: | |
1484 | return Expression::make_func_reference(real, NULL, location); | |
1485 | case Named_object::NAMED_OBJECT_PACKAGE: | |
1486 | if (this->is_composite_literal_key_) | |
1487 | return this; | |
acf8e158 | 1488 | if (!this->no_error_message_) |
631d5788 | 1489 | go_error_at(location, "unexpected reference to package"); |
e440a328 | 1490 | return Expression::make_error(location); |
1491 | default: | |
c3e6f413 | 1492 | go_unreachable(); |
e440a328 | 1493 | } |
1494 | } | |
1495 | ||
d751bb78 | 1496 | // Dump the ast representation for an unknown expression to a dump context. |
1497 | ||
1498 | void | |
1499 | Unknown_expression::do_dump_expression(Ast_dump_context* ast_dump_context) const | |
1500 | { | |
1501 | ast_dump_context->ostream() << "_Unknown_(" << this->named_object_->name() | |
1502 | << ")"; | |
d751bb78 | 1503 | } |
1504 | ||
e440a328 | 1505 | // Make a reference to an unknown name. |
1506 | ||
acf8e158 | 1507 | Unknown_expression* |
b13c66cd | 1508 | Expression::make_unknown_reference(Named_object* no, Location location) |
e440a328 | 1509 | { |
e440a328 | 1510 | return new Unknown_expression(no, location); |
1511 | } | |
1512 | ||
1513 | // A boolean expression. | |
1514 | ||
1515 | class Boolean_expression : public Expression | |
1516 | { | |
1517 | public: | |
b13c66cd | 1518 | Boolean_expression(bool val, Location location) |
e440a328 | 1519 | : Expression(EXPRESSION_BOOLEAN, location), |
1520 | val_(val), type_(NULL) | |
1521 | { } | |
1522 | ||
1523 | static Expression* | |
1524 | do_import(Import*); | |
1525 | ||
1526 | protected: | |
1527 | bool | |
1528 | do_is_constant() const | |
1529 | { return true; } | |
1530 | ||
0e168074 | 1531 | bool |
3ae06f68 | 1532 | do_is_static_initializer() const |
0e168074 | 1533 | { return true; } |
1534 | ||
e440a328 | 1535 | Type* |
1536 | do_type(); | |
1537 | ||
1538 | void | |
1539 | do_determine_type(const Type_context*); | |
1540 | ||
1541 | Expression* | |
1542 | do_copy() | |
1543 | { return this; } | |
1544 | ||
ea664253 | 1545 | Bexpression* |
1546 | do_get_backend(Translate_context* context) | |
1547 | { return context->backend()->boolean_constant_expression(this->val_); } | |
e440a328 | 1548 | |
1549 | void | |
1550 | do_export(Export* exp) const | |
1551 | { exp->write_c_string(this->val_ ? "true" : "false"); } | |
1552 | ||
d751bb78 | 1553 | void |
1554 | do_dump_expression(Ast_dump_context* ast_dump_context) const | |
1555 | { ast_dump_context->ostream() << (this->val_ ? "true" : "false"); } | |
1556 | ||
e440a328 | 1557 | private: |
1558 | // The constant. | |
1559 | bool val_; | |
1560 | // The type as determined by context. | |
1561 | Type* type_; | |
1562 | }; | |
1563 | ||
1564 | // Get the type. | |
1565 | ||
1566 | Type* | |
1567 | Boolean_expression::do_type() | |
1568 | { | |
1569 | if (this->type_ == NULL) | |
1570 | this->type_ = Type::make_boolean_type(); | |
1571 | return this->type_; | |
1572 | } | |
1573 | ||
1574 | // Set the type from the context. | |
1575 | ||
1576 | void | |
1577 | Boolean_expression::do_determine_type(const Type_context* context) | |
1578 | { | |
1579 | if (this->type_ != NULL && !this->type_->is_abstract()) | |
1580 | ; | |
1581 | else if (context->type != NULL && context->type->is_boolean_type()) | |
1582 | this->type_ = context->type; | |
1583 | else if (!context->may_be_abstract) | |
1584 | this->type_ = Type::lookup_bool_type(); | |
1585 | } | |
1586 | ||
1587 | // Import a boolean constant. | |
1588 | ||
1589 | Expression* | |
1590 | Boolean_expression::do_import(Import* imp) | |
1591 | { | |
1592 | if (imp->peek_char() == 't') | |
1593 | { | |
1594 | imp->require_c_string("true"); | |
1595 | return Expression::make_boolean(true, imp->location()); | |
1596 | } | |
1597 | else | |
1598 | { | |
1599 | imp->require_c_string("false"); | |
1600 | return Expression::make_boolean(false, imp->location()); | |
1601 | } | |
1602 | } | |
1603 | ||
1604 | // Make a boolean expression. | |
1605 | ||
1606 | Expression* | |
b13c66cd | 1607 | Expression::make_boolean(bool val, Location location) |
e440a328 | 1608 | { |
1609 | return new Boolean_expression(val, location); | |
1610 | } | |
1611 | ||
1612 | // Class String_expression. | |
1613 | ||
1614 | // Get the type. | |
1615 | ||
1616 | Type* | |
1617 | String_expression::do_type() | |
1618 | { | |
1619 | if (this->type_ == NULL) | |
1620 | this->type_ = Type::make_string_type(); | |
1621 | return this->type_; | |
1622 | } | |
1623 | ||
1624 | // Set the type from the context. | |
1625 | ||
1626 | void | |
1627 | String_expression::do_determine_type(const Type_context* context) | |
1628 | { | |
1629 | if (this->type_ != NULL && !this->type_->is_abstract()) | |
1630 | ; | |
1631 | else if (context->type != NULL && context->type->is_string_type()) | |
1632 | this->type_ = context->type; | |
1633 | else if (!context->may_be_abstract) | |
1634 | this->type_ = Type::lookup_string_type(); | |
1635 | } | |
1636 | ||
1637 | // Build a string constant. | |
1638 | ||
ea664253 | 1639 | Bexpression* |
1640 | String_expression::do_get_backend(Translate_context* context) | |
e440a328 | 1641 | { |
2c809f8f | 1642 | Gogo* gogo = context->gogo(); |
1643 | Btype* btype = Type::make_string_type()->get_backend(gogo); | |
1644 | ||
1645 | Location loc = this->location(); | |
1646 | std::vector<Bexpression*> init(2); | |
1647 | Bexpression* str_cst = | |
1648 | gogo->backend()->string_constant_expression(this->val_); | |
1649 | init[0] = gogo->backend()->address_expression(str_cst, loc); | |
1650 | ||
1651 | Btype* int_btype = Type::lookup_integer_type("int")->get_backend(gogo); | |
1652 | mpz_t lenval; | |
1653 | mpz_init_set_ui(lenval, this->val_.length()); | |
1654 | init[1] = gogo->backend()->integer_constant_expression(int_btype, lenval); | |
1655 | mpz_clear(lenval); | |
1656 | ||
ea664253 | 1657 | return gogo->backend()->constructor_expression(btype, init, loc); |
e440a328 | 1658 | } |
1659 | ||
8b1c301d | 1660 | // Write string literal to string dump. |
e440a328 | 1661 | |
1662 | void | |
8b1c301d | 1663 | String_expression::export_string(String_dump* exp, |
1664 | const String_expression* str) | |
e440a328 | 1665 | { |
1666 | std::string s; | |
8b1c301d | 1667 | s.reserve(str->val_.length() * 4 + 2); |
e440a328 | 1668 | s += '"'; |
8b1c301d | 1669 | for (std::string::const_iterator p = str->val_.begin(); |
1670 | p != str->val_.end(); | |
e440a328 | 1671 | ++p) |
1672 | { | |
1673 | if (*p == '\\' || *p == '"') | |
1674 | { | |
1675 | s += '\\'; | |
1676 | s += *p; | |
1677 | } | |
1678 | else if (*p >= 0x20 && *p < 0x7f) | |
1679 | s += *p; | |
1680 | else if (*p == '\n') | |
1681 | s += "\\n"; | |
1682 | else if (*p == '\t') | |
1683 | s += "\\t"; | |
1684 | else | |
1685 | { | |
1686 | s += "\\x"; | |
1687 | unsigned char c = *p; | |
1688 | unsigned int dig = c >> 4; | |
1689 | s += dig < 10 ? '0' + dig : 'A' + dig - 10; | |
1690 | dig = c & 0xf; | |
1691 | s += dig < 10 ? '0' + dig : 'A' + dig - 10; | |
1692 | } | |
1693 | } | |
1694 | s += '"'; | |
1695 | exp->write_string(s); | |
1696 | } | |
1697 | ||
8b1c301d | 1698 | // Export a string expression. |
1699 | ||
1700 | void | |
1701 | String_expression::do_export(Export* exp) const | |
1702 | { | |
1703 | String_expression::export_string(exp, this); | |
1704 | } | |
1705 | ||
e440a328 | 1706 | // Import a string expression. |
1707 | ||
1708 | Expression* | |
1709 | String_expression::do_import(Import* imp) | |
1710 | { | |
1711 | imp->require_c_string("\""); | |
1712 | std::string val; | |
1713 | while (true) | |
1714 | { | |
1715 | int c = imp->get_char(); | |
1716 | if (c == '"' || c == -1) | |
1717 | break; | |
1718 | if (c != '\\') | |
1719 | val += static_cast<char>(c); | |
1720 | else | |
1721 | { | |
1722 | c = imp->get_char(); | |
1723 | if (c == '\\' || c == '"') | |
1724 | val += static_cast<char>(c); | |
1725 | else if (c == 'n') | |
1726 | val += '\n'; | |
1727 | else if (c == 't') | |
1728 | val += '\t'; | |
1729 | else if (c == 'x') | |
1730 | { | |
1731 | c = imp->get_char(); | |
1732 | unsigned int vh = c >= '0' && c <= '9' ? c - '0' : c - 'A' + 10; | |
1733 | c = imp->get_char(); | |
1734 | unsigned int vl = c >= '0' && c <= '9' ? c - '0' : c - 'A' + 10; | |
1735 | char v = (vh << 4) | vl; | |
1736 | val += v; | |
1737 | } | |
1738 | else | |
1739 | { | |
631d5788 | 1740 | go_error_at(imp->location(), "bad string constant"); |
e440a328 | 1741 | return Expression::make_error(imp->location()); |
1742 | } | |
1743 | } | |
1744 | } | |
1745 | return Expression::make_string(val, imp->location()); | |
1746 | } | |
1747 | ||
d751bb78 | 1748 | // Ast dump for string expression. |
1749 | ||
1750 | void | |
1751 | String_expression::do_dump_expression(Ast_dump_context* ast_dump_context) const | |
1752 | { | |
8b1c301d | 1753 | String_expression::export_string(ast_dump_context, this); |
d751bb78 | 1754 | } |
1755 | ||
e440a328 | 1756 | // Make a string expression. |
1757 | ||
1758 | Expression* | |
b13c66cd | 1759 | Expression::make_string(const std::string& val, Location location) |
e440a328 | 1760 | { |
1761 | return new String_expression(val, location); | |
1762 | } | |
1763 | ||
2c809f8f | 1764 | // An expression that evaluates to some characteristic of a string. |
1765 | // This is used when indexing, bound-checking, or nil checking a string. | |
1766 | ||
1767 | class String_info_expression : public Expression | |
1768 | { | |
1769 | public: | |
1770 | String_info_expression(Expression* string, String_info string_info, | |
1771 | Location location) | |
1772 | : Expression(EXPRESSION_STRING_INFO, location), | |
1773 | string_(string), string_info_(string_info) | |
1774 | { } | |
1775 | ||
1776 | protected: | |
1777 | Type* | |
1778 | do_type(); | |
1779 | ||
1780 | void | |
1781 | do_determine_type(const Type_context*) | |
1782 | { go_unreachable(); } | |
1783 | ||
1784 | Expression* | |
1785 | do_copy() | |
1786 | { | |
1787 | return new String_info_expression(this->string_->copy(), this->string_info_, | |
1788 | this->location()); | |
1789 | } | |
1790 | ||
ea664253 | 1791 | Bexpression* |
1792 | do_get_backend(Translate_context* context); | |
2c809f8f | 1793 | |
1794 | void | |
1795 | do_dump_expression(Ast_dump_context*) const; | |
1796 | ||
1797 | void | |
1798 | do_issue_nil_check() | |
1799 | { this->string_->issue_nil_check(); } | |
1800 | ||
1801 | private: | |
1802 | // The string for which we are getting information. | |
1803 | Expression* string_; | |
1804 | // What information we want. | |
1805 | String_info string_info_; | |
1806 | }; | |
1807 | ||
1808 | // Return the type of the string info. | |
1809 | ||
1810 | Type* | |
1811 | String_info_expression::do_type() | |
1812 | { | |
1813 | switch (this->string_info_) | |
1814 | { | |
1815 | case STRING_INFO_DATA: | |
1816 | { | |
1817 | Type* byte_type = Type::lookup_integer_type("uint8"); | |
1818 | return Type::make_pointer_type(byte_type); | |
1819 | } | |
1820 | case STRING_INFO_LENGTH: | |
1821 | return Type::lookup_integer_type("int"); | |
1822 | default: | |
1823 | go_unreachable(); | |
1824 | } | |
1825 | } | |
1826 | ||
1827 | // Return string information in GENERIC. | |
1828 | ||
ea664253 | 1829 | Bexpression* |
1830 | String_info_expression::do_get_backend(Translate_context* context) | |
2c809f8f | 1831 | { |
1832 | Gogo* gogo = context->gogo(); | |
1833 | ||
ea664253 | 1834 | Bexpression* bstring = this->string_->get_backend(context); |
2c809f8f | 1835 | switch (this->string_info_) |
1836 | { | |
1837 | case STRING_INFO_DATA: | |
1838 | case STRING_INFO_LENGTH: | |
ea664253 | 1839 | return gogo->backend()->struct_field_expression(bstring, |
1840 | this->string_info_, | |
1841 | this->location()); | |
2c809f8f | 1842 | break; |
1843 | default: | |
1844 | go_unreachable(); | |
1845 | } | |
2c809f8f | 1846 | } |
1847 | ||
1848 | // Dump ast representation for a type info expression. | |
1849 | ||
1850 | void | |
1851 | String_info_expression::do_dump_expression( | |
1852 | Ast_dump_context* ast_dump_context) const | |
1853 | { | |
1854 | ast_dump_context->ostream() << "stringinfo("; | |
1855 | this->string_->dump_expression(ast_dump_context); | |
1856 | ast_dump_context->ostream() << ","; | |
1857 | ast_dump_context->ostream() << | |
1858 | (this->string_info_ == STRING_INFO_DATA ? "data" | |
1859 | : this->string_info_ == STRING_INFO_LENGTH ? "length" | |
1860 | : "unknown"); | |
1861 | ast_dump_context->ostream() << ")"; | |
1862 | } | |
1863 | ||
1864 | // Make a string info expression. | |
1865 | ||
1866 | Expression* | |
1867 | Expression::make_string_info(Expression* string, String_info string_info, | |
1868 | Location location) | |
1869 | { | |
1870 | return new String_info_expression(string, string_info, location); | |
1871 | } | |
1872 | ||
e440a328 | 1873 | // Make an integer expression. |
1874 | ||
1875 | class Integer_expression : public Expression | |
1876 | { | |
1877 | public: | |
5d4b8566 | 1878 | Integer_expression(const mpz_t* val, Type* type, bool is_character_constant, |
1879 | Location location) | |
e440a328 | 1880 | : Expression(EXPRESSION_INTEGER, location), |
5d4b8566 | 1881 | type_(type), is_character_constant_(is_character_constant) |
e440a328 | 1882 | { mpz_init_set(this->val_, *val); } |
1883 | ||
1884 | static Expression* | |
1885 | do_import(Import*); | |
1886 | ||
8b1c301d | 1887 | // Write VAL to string dump. |
e440a328 | 1888 | static void |
8b1c301d | 1889 | export_integer(String_dump* exp, const mpz_t val); |
e440a328 | 1890 | |
d751bb78 | 1891 | // Write VAL to dump context. |
1892 | static void | |
1893 | dump_integer(Ast_dump_context* ast_dump_context, const mpz_t val); | |
1894 | ||
e440a328 | 1895 | protected: |
1896 | bool | |
1897 | do_is_constant() const | |
1898 | { return true; } | |
1899 | ||
0e168074 | 1900 | bool |
3ae06f68 | 1901 | do_is_static_initializer() const |
0e168074 | 1902 | { return true; } |
1903 | ||
e440a328 | 1904 | bool |
0c77715b | 1905 | do_numeric_constant_value(Numeric_constant* nc) const; |
e440a328 | 1906 | |
1907 | Type* | |
1908 | do_type(); | |
1909 | ||
1910 | void | |
1911 | do_determine_type(const Type_context* context); | |
1912 | ||
1913 | void | |
1914 | do_check_types(Gogo*); | |
1915 | ||
ea664253 | 1916 | Bexpression* |
1917 | do_get_backend(Translate_context*); | |
e440a328 | 1918 | |
1919 | Expression* | |
1920 | do_copy() | |
5d4b8566 | 1921 | { |
1922 | if (this->is_character_constant_) | |
1923 | return Expression::make_character(&this->val_, this->type_, | |
1924 | this->location()); | |
1925 | else | |
e67508fa | 1926 | return Expression::make_integer_z(&this->val_, this->type_, |
1927 | this->location()); | |
5d4b8566 | 1928 | } |
e440a328 | 1929 | |
1930 | void | |
1931 | do_export(Export*) const; | |
1932 | ||
d751bb78 | 1933 | void |
1934 | do_dump_expression(Ast_dump_context*) const; | |
1935 | ||
e440a328 | 1936 | private: |
1937 | // The integer value. | |
1938 | mpz_t val_; | |
1939 | // The type so far. | |
1940 | Type* type_; | |
5d4b8566 | 1941 | // Whether this is a character constant. |
1942 | bool is_character_constant_; | |
e440a328 | 1943 | }; |
1944 | ||
0c77715b | 1945 | // Return a numeric constant for this expression. We have to mark |
1946 | // this as a character when appropriate. | |
e440a328 | 1947 | |
1948 | bool | |
0c77715b | 1949 | Integer_expression::do_numeric_constant_value(Numeric_constant* nc) const |
e440a328 | 1950 | { |
0c77715b | 1951 | if (this->is_character_constant_) |
1952 | nc->set_rune(this->type_, this->val_); | |
1953 | else | |
1954 | nc->set_int(this->type_, this->val_); | |
e440a328 | 1955 | return true; |
1956 | } | |
1957 | ||
1958 | // Return the current type. If we haven't set the type yet, we return | |
1959 | // an abstract integer type. | |
1960 | ||
1961 | Type* | |
1962 | Integer_expression::do_type() | |
1963 | { | |
1964 | if (this->type_ == NULL) | |
5d4b8566 | 1965 | { |
1966 | if (this->is_character_constant_) | |
1967 | this->type_ = Type::make_abstract_character_type(); | |
1968 | else | |
1969 | this->type_ = Type::make_abstract_integer_type(); | |
1970 | } | |
e440a328 | 1971 | return this->type_; |
1972 | } | |
1973 | ||
1974 | // Set the type of the integer value. Here we may switch from an | |
1975 | // abstract type to a real type. | |
1976 | ||
1977 | void | |
1978 | Integer_expression::do_determine_type(const Type_context* context) | |
1979 | { | |
1980 | if (this->type_ != NULL && !this->type_->is_abstract()) | |
1981 | ; | |
0c77715b | 1982 | else if (context->type != NULL && context->type->is_numeric_type()) |
e440a328 | 1983 | this->type_ = context->type; |
1984 | else if (!context->may_be_abstract) | |
5d4b8566 | 1985 | { |
1986 | if (this->is_character_constant_) | |
1987 | this->type_ = Type::lookup_integer_type("int32"); | |
1988 | else | |
1989 | this->type_ = Type::lookup_integer_type("int"); | |
1990 | } | |
e440a328 | 1991 | } |
1992 | ||
e440a328 | 1993 | // Check the type of an integer constant. |
1994 | ||
1995 | void | |
1996 | Integer_expression::do_check_types(Gogo*) | |
1997 | { | |
0c77715b | 1998 | Type* type = this->type_; |
1999 | if (type == NULL) | |
e440a328 | 2000 | return; |
0c77715b | 2001 | Numeric_constant nc; |
2002 | if (this->is_character_constant_) | |
2003 | nc.set_rune(NULL, this->val_); | |
2004 | else | |
2005 | nc.set_int(NULL, this->val_); | |
2006 | if (!nc.set_type(type, true, this->location())) | |
e440a328 | 2007 | this->set_is_error(); |
2008 | } | |
2009 | ||
ea664253 | 2010 | // Get the backend representation for an integer constant. |
e440a328 | 2011 | |
ea664253 | 2012 | Bexpression* |
2013 | Integer_expression::do_get_backend(Translate_context* context) | |
e440a328 | 2014 | { |
12373dd5 | 2015 | if (this->is_error_expression() |
2016 | || (this->type_ != NULL && this->type_->is_error_type())) | |
2017 | { | |
2018 | go_assert(saw_errors()); | |
2019 | return context->gogo()->backend()->error_expression(); | |
2020 | } | |
2021 | ||
48c2a53a | 2022 | Type* resolved_type = NULL; |
e440a328 | 2023 | if (this->type_ != NULL && !this->type_->is_abstract()) |
48c2a53a | 2024 | resolved_type = this->type_; |
e440a328 | 2025 | else if (this->type_ != NULL && this->type_->float_type() != NULL) |
2026 | { | |
2027 | // We are converting to an abstract floating point type. | |
48c2a53a | 2028 | resolved_type = Type::lookup_float_type("float64"); |
e440a328 | 2029 | } |
2030 | else if (this->type_ != NULL && this->type_->complex_type() != NULL) | |
2031 | { | |
2032 | // We are converting to an abstract complex type. | |
48c2a53a | 2033 | resolved_type = Type::lookup_complex_type("complex128"); |
e440a328 | 2034 | } |
2035 | else | |
2036 | { | |
2037 | // If we still have an abstract type here, then this is being | |
2038 | // used in a constant expression which didn't get reduced for | |
2039 | // some reason. Use a type which will fit the value. We use <, | |
2040 | // not <=, because we need an extra bit for the sign bit. | |
2041 | int bits = mpz_sizeinbase(this->val_, 2); | |
1b1f2abf | 2042 | Type* int_type = Type::lookup_integer_type("int"); |
2043 | if (bits < int_type->integer_type()->bits()) | |
48c2a53a | 2044 | resolved_type = int_type; |
e440a328 | 2045 | else if (bits < 64) |
48c2a53a | 2046 | resolved_type = Type::lookup_integer_type("int64"); |
e440a328 | 2047 | else |
48c2a53a | 2048 | { |
2049 | if (!saw_errors()) | |
631d5788 | 2050 | go_error_at(this->location(), |
2051 | "unknown type for large integer constant"); | |
ea664253 | 2052 | return context->gogo()->backend()->error_expression(); |
48c2a53a | 2053 | } |
e440a328 | 2054 | } |
48c2a53a | 2055 | Numeric_constant nc; |
2056 | nc.set_int(resolved_type, this->val_); | |
ea664253 | 2057 | return Expression::backend_numeric_constant_expression(context, &nc); |
e440a328 | 2058 | } |
2059 | ||
2060 | // Write VAL to export data. | |
2061 | ||
2062 | void | |
8b1c301d | 2063 | Integer_expression::export_integer(String_dump* exp, const mpz_t val) |
e440a328 | 2064 | { |
2065 | char* s = mpz_get_str(NULL, 10, val); | |
2066 | exp->write_c_string(s); | |
2067 | free(s); | |
2068 | } | |
2069 | ||
2070 | // Export an integer in a constant expression. | |
2071 | ||
2072 | void | |
2073 | Integer_expression::do_export(Export* exp) const | |
2074 | { | |
2075 | Integer_expression::export_integer(exp, this->val_); | |
5d4b8566 | 2076 | if (this->is_character_constant_) |
2077 | exp->write_c_string("'"); | |
e440a328 | 2078 | // A trailing space lets us reliably identify the end of the number. |
2079 | exp->write_c_string(" "); | |
2080 | } | |
2081 | ||
2082 | // Import an integer, floating point, or complex value. This handles | |
2083 | // all these types because they all start with digits. | |
2084 | ||
2085 | Expression* | |
2086 | Integer_expression::do_import(Import* imp) | |
2087 | { | |
2088 | std::string num = imp->read_identifier(); | |
2089 | imp->require_c_string(" "); | |
2090 | if (!num.empty() && num[num.length() - 1] == 'i') | |
2091 | { | |
2092 | mpfr_t real; | |
2093 | size_t plus_pos = num.find('+', 1); | |
2094 | size_t minus_pos = num.find('-', 1); | |
2095 | size_t pos; | |
2096 | if (plus_pos == std::string::npos) | |
2097 | pos = minus_pos; | |
2098 | else if (minus_pos == std::string::npos) | |
2099 | pos = plus_pos; | |
2100 | else | |
2101 | { | |
631d5788 | 2102 | go_error_at(imp->location(), "bad number in import data: %qs", |
2103 | num.c_str()); | |
e440a328 | 2104 | return Expression::make_error(imp->location()); |
2105 | } | |
2106 | if (pos == std::string::npos) | |
2107 | mpfr_set_ui(real, 0, GMP_RNDN); | |
2108 | else | |
2109 | { | |
2110 | std::string real_str = num.substr(0, pos); | |
2111 | if (mpfr_init_set_str(real, real_str.c_str(), 10, GMP_RNDN) != 0) | |
2112 | { | |
631d5788 | 2113 | go_error_at(imp->location(), "bad number in import data: %qs", |
2114 | real_str.c_str()); | |
e440a328 | 2115 | return Expression::make_error(imp->location()); |
2116 | } | |
2117 | } | |
2118 | ||
2119 | std::string imag_str; | |
2120 | if (pos == std::string::npos) | |
2121 | imag_str = num; | |
2122 | else | |
2123 | imag_str = num.substr(pos); | |
2124 | imag_str = imag_str.substr(0, imag_str.size() - 1); | |
2125 | mpfr_t imag; | |
2126 | if (mpfr_init_set_str(imag, imag_str.c_str(), 10, GMP_RNDN) != 0) | |
2127 | { | |
631d5788 | 2128 | go_error_at(imp->location(), "bad number in import data: %qs", |
2129 | imag_str.c_str()); | |
e440a328 | 2130 | return Expression::make_error(imp->location()); |
2131 | } | |
fcbea5e4 | 2132 | mpc_t cval; |
2133 | mpc_init2(cval, mpc_precision); | |
2134 | mpc_set_fr_fr(cval, real, imag, MPC_RNDNN); | |
e440a328 | 2135 | mpfr_clear(real); |
2136 | mpfr_clear(imag); | |
fcbea5e4 | 2137 | Expression* ret = Expression::make_complex(&cval, NULL, imp->location()); |
2138 | mpc_clear(cval); | |
e440a328 | 2139 | return ret; |
2140 | } | |
2141 | else if (num.find('.') == std::string::npos | |
2142 | && num.find('E') == std::string::npos) | |
2143 | { | |
5d4b8566 | 2144 | bool is_character_constant = (!num.empty() |
2145 | && num[num.length() - 1] == '\''); | |
2146 | if (is_character_constant) | |
2147 | num = num.substr(0, num.length() - 1); | |
e440a328 | 2148 | mpz_t val; |
2149 | if (mpz_init_set_str(val, num.c_str(), 10) != 0) | |
2150 | { | |
631d5788 | 2151 | go_error_at(imp->location(), "bad number in import data: %qs", |
2152 | num.c_str()); | |
e440a328 | 2153 | return Expression::make_error(imp->location()); |
2154 | } | |
5d4b8566 | 2155 | Expression* ret; |
2156 | if (is_character_constant) | |
2157 | ret = Expression::make_character(&val, NULL, imp->location()); | |
2158 | else | |
e67508fa | 2159 | ret = Expression::make_integer_z(&val, NULL, imp->location()); |
e440a328 | 2160 | mpz_clear(val); |
2161 | return ret; | |
2162 | } | |
2163 | else | |
2164 | { | |
2165 | mpfr_t val; | |
2166 | if (mpfr_init_set_str(val, num.c_str(), 10, GMP_RNDN) != 0) | |
2167 | { | |
631d5788 | 2168 | go_error_at(imp->location(), "bad number in import data: %qs", |
2169 | num.c_str()); | |
e440a328 | 2170 | return Expression::make_error(imp->location()); |
2171 | } | |
2172 | Expression* ret = Expression::make_float(&val, NULL, imp->location()); | |
2173 | mpfr_clear(val); | |
2174 | return ret; | |
2175 | } | |
2176 | } | |
d751bb78 | 2177 | // Ast dump for integer expression. |
2178 | ||
2179 | void | |
2180 | Integer_expression::do_dump_expression(Ast_dump_context* ast_dump_context) const | |
2181 | { | |
5d4b8566 | 2182 | if (this->is_character_constant_) |
2183 | ast_dump_context->ostream() << '\''; | |
8b1c301d | 2184 | Integer_expression::export_integer(ast_dump_context, this->val_); |
5d4b8566 | 2185 | if (this->is_character_constant_) |
2186 | ast_dump_context->ostream() << '\''; | |
d751bb78 | 2187 | } |
2188 | ||
e67508fa | 2189 | // Build a new integer value from a multi-precision integer. |
e440a328 | 2190 | |
2191 | Expression* | |
e67508fa | 2192 | Expression::make_integer_z(const mpz_t* val, Type* type, Location location) |
5d4b8566 | 2193 | { |
2194 | return new Integer_expression(val, type, false, location); | |
2195 | } | |
2196 | ||
e67508fa | 2197 | // Build a new integer value from an unsigned long. |
2198 | ||
2199 | Expression* | |
2200 | Expression::make_integer_ul(unsigned long val, Type *type, Location location) | |
2201 | { | |
2202 | mpz_t zval; | |
2203 | mpz_init_set_ui(zval, val); | |
2204 | Expression* ret = Expression::make_integer_z(&zval, type, location); | |
2205 | mpz_clear(zval); | |
2206 | return ret; | |
2207 | } | |
2208 | ||
2209 | // Build a new integer value from a signed long. | |
2210 | ||
2211 | Expression* | |
2212 | Expression::make_integer_sl(long val, Type *type, Location location) | |
2213 | { | |
2214 | mpz_t zval; | |
2215 | mpz_init_set_si(zval, val); | |
2216 | Expression* ret = Expression::make_integer_z(&zval, type, location); | |
2217 | mpz_clear(zval); | |
2218 | return ret; | |
2219 | } | |
2220 | ||
3f378015 | 2221 | // Store an int64_t in an uninitialized mpz_t. |
2222 | ||
2223 | static void | |
2224 | set_mpz_from_int64(mpz_t* zval, int64_t val) | |
2225 | { | |
2226 | if (val >= 0) | |
2227 | { | |
2228 | unsigned long ul = static_cast<unsigned long>(val); | |
2229 | if (static_cast<int64_t>(ul) == val) | |
2230 | { | |
2231 | mpz_init_set_ui(*zval, ul); | |
2232 | return; | |
2233 | } | |
2234 | } | |
2235 | uint64_t uv; | |
2236 | if (val >= 0) | |
2237 | uv = static_cast<uint64_t>(val); | |
2238 | else | |
2239 | uv = static_cast<uint64_t>(- val); | |
2240 | unsigned long ul = uv & 0xffffffffUL; | |
2241 | mpz_init_set_ui(*zval, ul); | |
2242 | mpz_t hval; | |
2243 | mpz_init_set_ui(hval, static_cast<unsigned long>(uv >> 32)); | |
2244 | mpz_mul_2exp(hval, hval, 32); | |
2245 | mpz_add(*zval, *zval, hval); | |
2246 | mpz_clear(hval); | |
2247 | if (val < 0) | |
2248 | mpz_neg(*zval, *zval); | |
2249 | } | |
2250 | ||
2251 | // Build a new integer value from an int64_t. | |
2252 | ||
2253 | Expression* | |
2254 | Expression::make_integer_int64(int64_t val, Type* type, Location location) | |
2255 | { | |
2256 | mpz_t zval; | |
2257 | set_mpz_from_int64(&zval, val); | |
2258 | Expression* ret = Expression::make_integer_z(&zval, type, location); | |
2259 | mpz_clear(zval); | |
2260 | return ret; | |
2261 | } | |
2262 | ||
5d4b8566 | 2263 | // Build a new character constant value. |
2264 | ||
2265 | Expression* | |
2266 | Expression::make_character(const mpz_t* val, Type* type, Location location) | |
e440a328 | 2267 | { |
5d4b8566 | 2268 | return new Integer_expression(val, type, true, location); |
e440a328 | 2269 | } |
2270 | ||
2271 | // Floats. | |
2272 | ||
2273 | class Float_expression : public Expression | |
2274 | { | |
2275 | public: | |
b13c66cd | 2276 | Float_expression(const mpfr_t* val, Type* type, Location location) |
e440a328 | 2277 | : Expression(EXPRESSION_FLOAT, location), |
2278 | type_(type) | |
2279 | { | |
2280 | mpfr_init_set(this->val_, *val, GMP_RNDN); | |
2281 | } | |
2282 | ||
e440a328 | 2283 | // Write VAL to export data. |
2284 | static void | |
8b1c301d | 2285 | export_float(String_dump* exp, const mpfr_t val); |
2286 | ||
d751bb78 | 2287 | // Write VAL to dump file. |
2288 | static void | |
2289 | dump_float(Ast_dump_context* ast_dump_context, const mpfr_t val); | |
e440a328 | 2290 | |
2291 | protected: | |
2292 | bool | |
2293 | do_is_constant() const | |
2294 | { return true; } | |
2295 | ||
0e168074 | 2296 | bool |
3ae06f68 | 2297 | do_is_static_initializer() const |
0e168074 | 2298 | { return true; } |
2299 | ||
e440a328 | 2300 | bool |
0c77715b | 2301 | do_numeric_constant_value(Numeric_constant* nc) const |
2302 | { | |
2303 | nc->set_float(this->type_, this->val_); | |
2304 | return true; | |
2305 | } | |
e440a328 | 2306 | |
2307 | Type* | |
2308 | do_type(); | |
2309 | ||
2310 | void | |
2311 | do_determine_type(const Type_context*); | |
2312 | ||
2313 | void | |
2314 | do_check_types(Gogo*); | |
2315 | ||
2316 | Expression* | |
2317 | do_copy() | |
2318 | { return Expression::make_float(&this->val_, this->type_, | |
2319 | this->location()); } | |
2320 | ||
ea664253 | 2321 | Bexpression* |
2322 | do_get_backend(Translate_context*); | |
e440a328 | 2323 | |
2324 | void | |
2325 | do_export(Export*) const; | |
2326 | ||
d751bb78 | 2327 | void |
2328 | do_dump_expression(Ast_dump_context*) const; | |
2329 | ||
e440a328 | 2330 | private: |
2331 | // The floating point value. | |
2332 | mpfr_t val_; | |
2333 | // The type so far. | |
2334 | Type* type_; | |
2335 | }; | |
2336 | ||
e440a328 | 2337 | // Return the current type. If we haven't set the type yet, we return |
2338 | // an abstract float type. | |
2339 | ||
2340 | Type* | |
2341 | Float_expression::do_type() | |
2342 | { | |
2343 | if (this->type_ == NULL) | |
2344 | this->type_ = Type::make_abstract_float_type(); | |
2345 | return this->type_; | |
2346 | } | |
2347 | ||
2348 | // Set the type of the float value. Here we may switch from an | |
2349 | // abstract type to a real type. | |
2350 | ||
2351 | void | |
2352 | Float_expression::do_determine_type(const Type_context* context) | |
2353 | { | |
2354 | if (this->type_ != NULL && !this->type_->is_abstract()) | |
2355 | ; | |
2356 | else if (context->type != NULL | |
2357 | && (context->type->integer_type() != NULL | |
2358 | || context->type->float_type() != NULL | |
2359 | || context->type->complex_type() != NULL)) | |
2360 | this->type_ = context->type; | |
2361 | else if (!context->may_be_abstract) | |
48080209 | 2362 | this->type_ = Type::lookup_float_type("float64"); |
e440a328 | 2363 | } |
2364 | ||
e440a328 | 2365 | // Check the type of a float value. |
2366 | ||
2367 | void | |
2368 | Float_expression::do_check_types(Gogo*) | |
2369 | { | |
0c77715b | 2370 | Type* type = this->type_; |
2371 | if (type == NULL) | |
e440a328 | 2372 | return; |
0c77715b | 2373 | Numeric_constant nc; |
2374 | nc.set_float(NULL, this->val_); | |
2375 | if (!nc.set_type(this->type_, true, this->location())) | |
e440a328 | 2376 | this->set_is_error(); |
e440a328 | 2377 | } |
2378 | ||
ea664253 | 2379 | // Get the backend representation for a float constant. |
e440a328 | 2380 | |
ea664253 | 2381 | Bexpression* |
2382 | Float_expression::do_get_backend(Translate_context* context) | |
e440a328 | 2383 | { |
12373dd5 | 2384 | if (this->is_error_expression() |
2385 | || (this->type_ != NULL && this->type_->is_error_type())) | |
2386 | { | |
2387 | go_assert(saw_errors()); | |
2388 | return context->gogo()->backend()->error_expression(); | |
2389 | } | |
2390 | ||
48c2a53a | 2391 | Type* resolved_type; |
e440a328 | 2392 | if (this->type_ != NULL && !this->type_->is_abstract()) |
48c2a53a | 2393 | resolved_type = this->type_; |
e440a328 | 2394 | else if (this->type_ != NULL && this->type_->integer_type() != NULL) |
2395 | { | |
2396 | // We have an abstract integer type. We just hope for the best. | |
48c2a53a | 2397 | resolved_type = Type::lookup_integer_type("int"); |
2398 | } | |
2399 | else if (this->type_ != NULL && this->type_->complex_type() != NULL) | |
2400 | { | |
2401 | // We are converting to an abstract complex type. | |
2402 | resolved_type = Type::lookup_complex_type("complex128"); | |
e440a328 | 2403 | } |
2404 | else | |
2405 | { | |
2406 | // If we still have an abstract type here, then this is being | |
2407 | // used in a constant expression which didn't get reduced. We | |
2408 | // just use float64 and hope for the best. | |
48c2a53a | 2409 | resolved_type = Type::lookup_float_type("float64"); |
e440a328 | 2410 | } |
48c2a53a | 2411 | |
2412 | Numeric_constant nc; | |
2413 | nc.set_float(resolved_type, this->val_); | |
ea664253 | 2414 | return Expression::backend_numeric_constant_expression(context, &nc); |
e440a328 | 2415 | } |
2416 | ||
8b1c301d | 2417 | // Write a floating point number to a string dump. |
e440a328 | 2418 | |
2419 | void | |
8b1c301d | 2420 | Float_expression::export_float(String_dump *exp, const mpfr_t val) |
e440a328 | 2421 | { |
2422 | mp_exp_t exponent; | |
2423 | char* s = mpfr_get_str(NULL, &exponent, 10, 0, val, GMP_RNDN); | |
2424 | if (*s == '-') | |
2425 | exp->write_c_string("-"); | |
2426 | exp->write_c_string("0."); | |
2427 | exp->write_c_string(*s == '-' ? s + 1 : s); | |
2428 | mpfr_free_str(s); | |
2429 | char buf[30]; | |
2430 | snprintf(buf, sizeof buf, "E%ld", exponent); | |
2431 | exp->write_c_string(buf); | |
2432 | } | |
2433 | ||
2434 | // Export a floating point number in a constant expression. | |
2435 | ||
2436 | void | |
2437 | Float_expression::do_export(Export* exp) const | |
2438 | { | |
2439 | Float_expression::export_float(exp, this->val_); | |
2440 | // A trailing space lets us reliably identify the end of the number. | |
2441 | exp->write_c_string(" "); | |
2442 | } | |
2443 | ||
d751bb78 | 2444 | // Dump a floating point number to the dump file. |
2445 | ||
2446 | void | |
2447 | Float_expression::do_dump_expression(Ast_dump_context* ast_dump_context) const | |
2448 | { | |
8b1c301d | 2449 | Float_expression::export_float(ast_dump_context, this->val_); |
d751bb78 | 2450 | } |
2451 | ||
e440a328 | 2452 | // Make a float expression. |
2453 | ||
2454 | Expression* | |
b13c66cd | 2455 | Expression::make_float(const mpfr_t* val, Type* type, Location location) |
e440a328 | 2456 | { |
2457 | return new Float_expression(val, type, location); | |
2458 | } | |
2459 | ||
2460 | // Complex numbers. | |
2461 | ||
2462 | class Complex_expression : public Expression | |
2463 | { | |
2464 | public: | |
fcbea5e4 | 2465 | Complex_expression(const mpc_t* val, Type* type, Location location) |
e440a328 | 2466 | : Expression(EXPRESSION_COMPLEX, location), |
2467 | type_(type) | |
2468 | { | |
fcbea5e4 | 2469 | mpc_init2(this->val_, mpc_precision); |
2470 | mpc_set(this->val_, *val, MPC_RNDNN); | |
e440a328 | 2471 | } |
2472 | ||
fcbea5e4 | 2473 | // Write VAL to string dump. |
e440a328 | 2474 | static void |
fcbea5e4 | 2475 | export_complex(String_dump* exp, const mpc_t val); |
e440a328 | 2476 | |
d751bb78 | 2477 | // Write REAL/IMAG to dump context. |
2478 | static void | |
fcbea5e4 | 2479 | dump_complex(Ast_dump_context* ast_dump_context, const mpc_t val); |
d751bb78 | 2480 | |
e440a328 | 2481 | protected: |
2482 | bool | |
2483 | do_is_constant() const | |
2484 | { return true; } | |
2485 | ||
0e168074 | 2486 | bool |
3ae06f68 | 2487 | do_is_static_initializer() const |
0e168074 | 2488 | { return true; } |
2489 | ||
e440a328 | 2490 | bool |
0c77715b | 2491 | do_numeric_constant_value(Numeric_constant* nc) const |
2492 | { | |
fcbea5e4 | 2493 | nc->set_complex(this->type_, this->val_); |
0c77715b | 2494 | return true; |
2495 | } | |
e440a328 | 2496 | |
2497 | Type* | |
2498 | do_type(); | |
2499 | ||
2500 | void | |
2501 | do_determine_type(const Type_context*); | |
2502 | ||
2503 | void | |
2504 | do_check_types(Gogo*); | |
2505 | ||
2506 | Expression* | |
2507 | do_copy() | |
2508 | { | |
fcbea5e4 | 2509 | return Expression::make_complex(&this->val_, this->type_, |
e440a328 | 2510 | this->location()); |
2511 | } | |
2512 | ||
ea664253 | 2513 | Bexpression* |
2514 | do_get_backend(Translate_context*); | |
e440a328 | 2515 | |
2516 | void | |
2517 | do_export(Export*) const; | |
2518 | ||
d751bb78 | 2519 | void |
2520 | do_dump_expression(Ast_dump_context*) const; | |
abd26de0 | 2521 | |
e440a328 | 2522 | private: |
fcbea5e4 | 2523 | // The complex value. |
2524 | mpc_t val_; | |
e440a328 | 2525 | // The type if known. |
2526 | Type* type_; | |
2527 | }; | |
2528 | ||
e440a328 | 2529 | // Return the current type. If we haven't set the type yet, we return |
2530 | // an abstract complex type. | |
2531 | ||
2532 | Type* | |
2533 | Complex_expression::do_type() | |
2534 | { | |
2535 | if (this->type_ == NULL) | |
2536 | this->type_ = Type::make_abstract_complex_type(); | |
2537 | return this->type_; | |
2538 | } | |
2539 | ||
2540 | // Set the type of the complex value. Here we may switch from an | |
2541 | // abstract type to a real type. | |
2542 | ||
2543 | void | |
2544 | Complex_expression::do_determine_type(const Type_context* context) | |
2545 | { | |
2546 | if (this->type_ != NULL && !this->type_->is_abstract()) | |
2547 | ; | |
abd26de0 | 2548 | else if (context->type != NULL && context->type->is_numeric_type()) |
e440a328 | 2549 | this->type_ = context->type; |
2550 | else if (!context->may_be_abstract) | |
48080209 | 2551 | this->type_ = Type::lookup_complex_type("complex128"); |
e440a328 | 2552 | } |
2553 | ||
e440a328 | 2554 | // Check the type of a complex value. |
2555 | ||
2556 | void | |
2557 | Complex_expression::do_check_types(Gogo*) | |
2558 | { | |
0c77715b | 2559 | Type* type = this->type_; |
2560 | if (type == NULL) | |
e440a328 | 2561 | return; |
0c77715b | 2562 | Numeric_constant nc; |
fcbea5e4 | 2563 | nc.set_complex(NULL, this->val_); |
0c77715b | 2564 | if (!nc.set_type(this->type_, true, this->location())) |
e440a328 | 2565 | this->set_is_error(); |
2566 | } | |
2567 | ||
ea664253 | 2568 | // Get the backend representation for a complex constant. |
e440a328 | 2569 | |
ea664253 | 2570 | Bexpression* |
2571 | Complex_expression::do_get_backend(Translate_context* context) | |
e440a328 | 2572 | { |
12373dd5 | 2573 | if (this->is_error_expression() |
2574 | || (this->type_ != NULL && this->type_->is_error_type())) | |
2575 | { | |
2576 | go_assert(saw_errors()); | |
2577 | return context->gogo()->backend()->error_expression(); | |
2578 | } | |
2579 | ||
48c2a53a | 2580 | Type* resolved_type; |
e440a328 | 2581 | if (this->type_ != NULL && !this->type_->is_abstract()) |
48c2a53a | 2582 | resolved_type = this->type_; |
2583 | else if (this->type_ != NULL && this->type_->integer_type() != NULL) | |
2584 | { | |
2585 | // We are converting to an abstract integer type. | |
2586 | resolved_type = Type::lookup_integer_type("int"); | |
2587 | } | |
2588 | else if (this->type_ != NULL && this->type_->float_type() != NULL) | |
2589 | { | |
2590 | // We are converting to an abstract float type. | |
2591 | resolved_type = Type::lookup_float_type("float64"); | |
2592 | } | |
e440a328 | 2593 | else |
2594 | { | |
47ae02b7 | 2595 | // If we still have an abstract type here, this is being |
e440a328 | 2596 | // used in a constant expression which didn't get reduced. We |
2597 | // just use complex128 and hope for the best. | |
48c2a53a | 2598 | resolved_type = Type::lookup_complex_type("complex128"); |
e440a328 | 2599 | } |
48c2a53a | 2600 | |
2601 | Numeric_constant nc; | |
fcbea5e4 | 2602 | nc.set_complex(resolved_type, this->val_); |
ea664253 | 2603 | return Expression::backend_numeric_constant_expression(context, &nc); |
e440a328 | 2604 | } |
2605 | ||
2606 | // Write REAL/IMAG to export data. | |
2607 | ||
2608 | void | |
fcbea5e4 | 2609 | Complex_expression::export_complex(String_dump* exp, const mpc_t val) |
e440a328 | 2610 | { |
fcbea5e4 | 2611 | if (!mpfr_zero_p(mpc_realref(val))) |
e440a328 | 2612 | { |
fcbea5e4 | 2613 | Float_expression::export_float(exp, mpc_realref(val)); |
d1db782d | 2614 | if (mpfr_sgn(mpc_imagref(val)) >= 0) |
e440a328 | 2615 | exp->write_c_string("+"); |
2616 | } | |
fcbea5e4 | 2617 | Float_expression::export_float(exp, mpc_imagref(val)); |
e440a328 | 2618 | exp->write_c_string("i"); |
2619 | } | |
2620 | ||
2621 | // Export a complex number in a constant expression. | |
2622 | ||
2623 | void | |
2624 | Complex_expression::do_export(Export* exp) const | |
2625 | { | |
fcbea5e4 | 2626 | Complex_expression::export_complex(exp, this->val_); |
e440a328 | 2627 | // A trailing space lets us reliably identify the end of the number. |
2628 | exp->write_c_string(" "); | |
2629 | } | |
2630 | ||
d751bb78 | 2631 | // Dump a complex expression to the dump file. |
2632 | ||
2633 | void | |
2634 | Complex_expression::do_dump_expression(Ast_dump_context* ast_dump_context) const | |
2635 | { | |
fcbea5e4 | 2636 | Complex_expression::export_complex(ast_dump_context, this->val_); |
d751bb78 | 2637 | } |
2638 | ||
e440a328 | 2639 | // Make a complex expression. |
2640 | ||
2641 | Expression* | |
fcbea5e4 | 2642 | Expression::make_complex(const mpc_t* val, Type* type, Location location) |
e440a328 | 2643 | { |
fcbea5e4 | 2644 | return new Complex_expression(val, type, location); |
e440a328 | 2645 | } |
2646 | ||
d5b605df | 2647 | // Find a named object in an expression. |
2648 | ||
2649 | class Find_named_object : public Traverse | |
2650 | { | |
2651 | public: | |
2652 | Find_named_object(Named_object* no) | |
2653 | : Traverse(traverse_expressions), | |
2654 | no_(no), found_(false) | |
2655 | { } | |
2656 | ||
2657 | // Whether we found the object. | |
2658 | bool | |
2659 | found() const | |
2660 | { return this->found_; } | |
2661 | ||
2662 | protected: | |
2663 | int | |
2664 | expression(Expression**); | |
2665 | ||
2666 | private: | |
2667 | // The object we are looking for. | |
2668 | Named_object* no_; | |
2669 | // Whether we found it. | |
2670 | bool found_; | |
2671 | }; | |
2672 | ||
e440a328 | 2673 | // A reference to a const in an expression. |
2674 | ||
2675 | class Const_expression : public Expression | |
2676 | { | |
2677 | public: | |
b13c66cd | 2678 | Const_expression(Named_object* constant, Location location) |
e440a328 | 2679 | : Expression(EXPRESSION_CONST_REFERENCE, location), |
13e818f5 | 2680 | constant_(constant), type_(NULL), seen_(false) |
e440a328 | 2681 | { } |
2682 | ||
d5b605df | 2683 | Named_object* |
2684 | named_object() | |
2685 | { return this->constant_; } | |
2686 | ||
a7f064d5 | 2687 | // Check that the initializer does not refer to the constant itself. |
2688 | void | |
2689 | check_for_init_loop(); | |
2690 | ||
e440a328 | 2691 | protected: |
ba4aedd4 | 2692 | int |
2693 | do_traverse(Traverse*); | |
2694 | ||
e440a328 | 2695 | Expression* |
ceeb4318 | 2696 | do_lower(Gogo*, Named_object*, Statement_inserter*, int); |
e440a328 | 2697 | |
2698 | bool | |
2699 | do_is_constant() const | |
2700 | { return true; } | |
2701 | ||
0e168074 | 2702 | bool |
3ae06f68 | 2703 | do_is_static_initializer() const |
0e168074 | 2704 | { return true; } |
2705 | ||
e440a328 | 2706 | bool |
0c77715b | 2707 | do_numeric_constant_value(Numeric_constant* nc) const; |
e440a328 | 2708 | |
2709 | bool | |
af6b489a | 2710 | do_string_constant_value(std::string* val) const; |
e440a328 | 2711 | |
2712 | Type* | |
2713 | do_type(); | |
2714 | ||
2715 | // The type of a const is set by the declaration, not the use. | |
2716 | void | |
2717 | do_determine_type(const Type_context*); | |
2718 | ||
2719 | void | |
2720 | do_check_types(Gogo*); | |
2721 | ||
2722 | Expression* | |
2723 | do_copy() | |
2724 | { return this; } | |
2725 | ||
ea664253 | 2726 | Bexpression* |
2727 | do_get_backend(Translate_context* context); | |
e440a328 | 2728 | |
2729 | // When exporting a reference to a const as part of a const | |
2730 | // expression, we export the value. We ignore the fact that it has | |
2731 | // a name. | |
2732 | void | |
2733 | do_export(Export* exp) const | |
2734 | { this->constant_->const_value()->expr()->export_expression(exp); } | |
2735 | ||
d751bb78 | 2736 | void |
2737 | do_dump_expression(Ast_dump_context*) const; | |
2738 | ||
e440a328 | 2739 | private: |
2740 | // The constant. | |
2741 | Named_object* constant_; | |
2742 | // The type of this reference. This is used if the constant has an | |
2743 | // abstract type. | |
2744 | Type* type_; | |
13e818f5 | 2745 | // Used to prevent infinite recursion when a constant incorrectly |
2746 | // refers to itself. | |
2747 | mutable bool seen_; | |
e440a328 | 2748 | }; |
2749 | ||
ba4aedd4 | 2750 | // Traversal. |
2751 | ||
2752 | int | |
2753 | Const_expression::do_traverse(Traverse* traverse) | |
2754 | { | |
2755 | if (this->type_ != NULL) | |
2756 | return Type::traverse(this->type_, traverse); | |
2757 | return TRAVERSE_CONTINUE; | |
2758 | } | |
2759 | ||
e440a328 | 2760 | // Lower a constant expression. This is where we convert the |
2761 | // predeclared constant iota into an integer value. | |
2762 | ||
2763 | Expression* | |
ceeb4318 | 2764 | Const_expression::do_lower(Gogo* gogo, Named_object*, |
2765 | Statement_inserter*, int iota_value) | |
e440a328 | 2766 | { |
2767 | if (this->constant_->const_value()->expr()->classification() | |
2768 | == EXPRESSION_IOTA) | |
2769 | { | |
2770 | if (iota_value == -1) | |
2771 | { | |
631d5788 | 2772 | go_error_at(this->location(), |
2773 | "iota is only defined in const declarations"); | |
e440a328 | 2774 | iota_value = 0; |
2775 | } | |
e67508fa | 2776 | return Expression::make_integer_ul(iota_value, NULL, this->location()); |
e440a328 | 2777 | } |
2778 | ||
2779 | // Make sure that the constant itself has been lowered. | |
2780 | gogo->lower_constant(this->constant_); | |
2781 | ||
2782 | return this; | |
2783 | } | |
2784 | ||
0c77715b | 2785 | // Return a numeric constant value. |
e440a328 | 2786 | |
2787 | bool | |
0c77715b | 2788 | Const_expression::do_numeric_constant_value(Numeric_constant* nc) const |
e440a328 | 2789 | { |
13e818f5 | 2790 | if (this->seen_) |
2791 | return false; | |
2792 | ||
e440a328 | 2793 | Expression* e = this->constant_->const_value()->expr(); |
0c77715b | 2794 | |
13e818f5 | 2795 | this->seen_ = true; |
2796 | ||
0c77715b | 2797 | bool r = e->numeric_constant_value(nc); |
e440a328 | 2798 | |
13e818f5 | 2799 | this->seen_ = false; |
2800 | ||
e440a328 | 2801 | Type* ctype; |
2802 | if (this->type_ != NULL) | |
2803 | ctype = this->type_; | |
2804 | else | |
2805 | ctype = this->constant_->const_value()->type(); | |
e440a328 | 2806 | if (r && ctype != NULL) |
2807 | { | |
0c77715b | 2808 | if (!nc->set_type(ctype, false, this->location())) |
e440a328 | 2809 | return false; |
e440a328 | 2810 | } |
e440a328 | 2811 | |
e440a328 | 2812 | return r; |
2813 | } | |
2814 | ||
af6b489a | 2815 | bool |
2816 | Const_expression::do_string_constant_value(std::string* val) const | |
2817 | { | |
2818 | if (this->seen_) | |
2819 | return false; | |
2820 | ||
2821 | Expression* e = this->constant_->const_value()->expr(); | |
2822 | ||
2823 | this->seen_ = true; | |
2824 | bool ok = e->string_constant_value(val); | |
2825 | this->seen_ = false; | |
2826 | ||
2827 | return ok; | |
2828 | } | |
2829 | ||
e440a328 | 2830 | // Return the type of the const reference. |
2831 | ||
2832 | Type* | |
2833 | Const_expression::do_type() | |
2834 | { | |
2835 | if (this->type_ != NULL) | |
2836 | return this->type_; | |
13e818f5 | 2837 | |
2f78f012 | 2838 | Named_constant* nc = this->constant_->const_value(); |
2839 | ||
2840 | if (this->seen_ || nc->lowering()) | |
13e818f5 | 2841 | { |
2842 | this->report_error(_("constant refers to itself")); | |
2843 | this->type_ = Type::make_error_type(); | |
2844 | return this->type_; | |
2845 | } | |
2846 | ||
2847 | this->seen_ = true; | |
2848 | ||
e440a328 | 2849 | Type* ret = nc->type(); |
13e818f5 | 2850 | |
e440a328 | 2851 | if (ret != NULL) |
13e818f5 | 2852 | { |
2853 | this->seen_ = false; | |
2854 | return ret; | |
2855 | } | |
2856 | ||
e440a328 | 2857 | // During parsing, a named constant may have a NULL type, but we |
2858 | // must not return a NULL type here. | |
13e818f5 | 2859 | ret = nc->expr()->type(); |
2860 | ||
2861 | this->seen_ = false; | |
2862 | ||
2863 | return ret; | |
e440a328 | 2864 | } |
2865 | ||
2866 | // Set the type of the const reference. | |
2867 | ||
2868 | void | |
2869 | Const_expression::do_determine_type(const Type_context* context) | |
2870 | { | |
2871 | Type* ctype = this->constant_->const_value()->type(); | |
2872 | Type* cetype = (ctype != NULL | |
2873 | ? ctype | |
2874 | : this->constant_->const_value()->expr()->type()); | |
2875 | if (ctype != NULL && !ctype->is_abstract()) | |
2876 | ; | |
2877 | else if (context->type != NULL | |
0c77715b | 2878 | && context->type->is_numeric_type() |
2879 | && cetype->is_numeric_type()) | |
e440a328 | 2880 | this->type_ = context->type; |
2881 | else if (context->type != NULL | |
2882 | && context->type->is_string_type() | |
2883 | && cetype->is_string_type()) | |
2884 | this->type_ = context->type; | |
2885 | else if (context->type != NULL | |
2886 | && context->type->is_boolean_type() | |
2887 | && cetype->is_boolean_type()) | |
2888 | this->type_ = context->type; | |
2889 | else if (!context->may_be_abstract) | |
2890 | { | |
2891 | if (cetype->is_abstract()) | |
2892 | cetype = cetype->make_non_abstract_type(); | |
2893 | this->type_ = cetype; | |
2894 | } | |
2895 | } | |
2896 | ||
a7f064d5 | 2897 | // Check for a loop in which the initializer of a constant refers to |
2898 | // the constant itself. | |
e440a328 | 2899 | |
2900 | void | |
a7f064d5 | 2901 | Const_expression::check_for_init_loop() |
e440a328 | 2902 | { |
5c13bd80 | 2903 | if (this->type_ != NULL && this->type_->is_error()) |
d5b605df | 2904 | return; |
2905 | ||
a7f064d5 | 2906 | if (this->seen_) |
2907 | { | |
2908 | this->report_error(_("constant refers to itself")); | |
2909 | this->type_ = Type::make_error_type(); | |
2910 | return; | |
2911 | } | |
2912 | ||
d5b605df | 2913 | Expression* init = this->constant_->const_value()->expr(); |
2914 | Find_named_object find_named_object(this->constant_); | |
a7f064d5 | 2915 | |
2916 | this->seen_ = true; | |
d5b605df | 2917 | Expression::traverse(&init, &find_named_object); |
a7f064d5 | 2918 | this->seen_ = false; |
2919 | ||
d5b605df | 2920 | if (find_named_object.found()) |
2921 | { | |
5c13bd80 | 2922 | if (this->type_ == NULL || !this->type_->is_error()) |
a7f064d5 | 2923 | { |
2924 | this->report_error(_("constant refers to itself")); | |
2925 | this->type_ = Type::make_error_type(); | |
2926 | } | |
d5b605df | 2927 | return; |
2928 | } | |
a7f064d5 | 2929 | } |
2930 | ||
2931 | // Check types of a const reference. | |
2932 | ||
2933 | void | |
2934 | Const_expression::do_check_types(Gogo*) | |
2935 | { | |
5c13bd80 | 2936 | if (this->type_ != NULL && this->type_->is_error()) |
a7f064d5 | 2937 | return; |
2938 | ||
2939 | this->check_for_init_loop(); | |
d5b605df | 2940 | |
0c77715b | 2941 | // Check that numeric constant fits in type. |
2942 | if (this->type_ != NULL && this->type_->is_numeric_type()) | |
e440a328 | 2943 | { |
0c77715b | 2944 | Numeric_constant nc; |
2945 | if (this->constant_->const_value()->expr()->numeric_constant_value(&nc)) | |
e440a328 | 2946 | { |
0c77715b | 2947 | if (!nc.set_type(this->type_, true, this->location())) |
2948 | this->set_is_error(); | |
e440a328 | 2949 | } |
e440a328 | 2950 | } |
2951 | } | |
2952 | ||
ea664253 | 2953 | // Return the backend representation for a const reference. |
e440a328 | 2954 | |
ea664253 | 2955 | Bexpression* |
2956 | Const_expression::do_get_backend(Translate_context* context) | |
e440a328 | 2957 | { |
12373dd5 | 2958 | if (this->is_error_expression() |
2959 | || (this->type_ != NULL && this->type_->is_error())) | |
2960 | { | |
2961 | go_assert(saw_errors()); | |
2962 | return context->backend()->error_expression(); | |
2963 | } | |
e440a328 | 2964 | |
2965 | // If the type has been set for this expression, but the underlying | |
2966 | // object is an abstract int or float, we try to get the abstract | |
2967 | // value. Otherwise we may lose something in the conversion. | |
f2de4532 | 2968 | Expression* expr = this->constant_->const_value()->expr(); |
e440a328 | 2969 | if (this->type_ != NULL |
0c77715b | 2970 | && this->type_->is_numeric_type() |
a68492b4 | 2971 | && (this->constant_->const_value()->type() == NULL |
2972 | || this->constant_->const_value()->type()->is_abstract())) | |
e440a328 | 2973 | { |
0c77715b | 2974 | Numeric_constant nc; |
2975 | if (expr->numeric_constant_value(&nc) | |
2976 | && nc.set_type(this->type_, false, this->location())) | |
e440a328 | 2977 | { |
0c77715b | 2978 | Expression* e = nc.expression(this->location()); |
ea664253 | 2979 | return e->get_backend(context); |
e440a328 | 2980 | } |
e440a328 | 2981 | } |
2982 | ||
2c809f8f | 2983 | if (this->type_ != NULL) |
f2de4532 | 2984 | expr = Expression::make_cast(this->type_, expr, this->location()); |
ea664253 | 2985 | return expr->get_backend(context); |
e440a328 | 2986 | } |
2987 | ||
d751bb78 | 2988 | // Dump ast representation for constant expression. |
2989 | ||
2990 | void | |
2991 | Const_expression::do_dump_expression(Ast_dump_context* ast_dump_context) const | |
2992 | { | |
2993 | ast_dump_context->ostream() << this->constant_->name(); | |
2994 | } | |
2995 | ||
e440a328 | 2996 | // Make a reference to a constant in an expression. |
2997 | ||
2998 | Expression* | |
2999 | Expression::make_const_reference(Named_object* constant, | |
b13c66cd | 3000 | Location location) |
e440a328 | 3001 | { |
3002 | return new Const_expression(constant, location); | |
3003 | } | |
3004 | ||
d5b605df | 3005 | // Find a named object in an expression. |
3006 | ||
3007 | int | |
3008 | Find_named_object::expression(Expression** pexpr) | |
3009 | { | |
3010 | switch ((*pexpr)->classification()) | |
3011 | { | |
3012 | case Expression::EXPRESSION_CONST_REFERENCE: | |
a7f064d5 | 3013 | { |
3014 | Const_expression* ce = static_cast<Const_expression*>(*pexpr); | |
3015 | if (ce->named_object() == this->no_) | |
3016 | break; | |
3017 | ||
3018 | // We need to check a constant initializer explicitly, as | |
3019 | // loops here will not be caught by the loop checking for | |
3020 | // variable initializers. | |
3021 | ce->check_for_init_loop(); | |
3022 | ||
3023 | return TRAVERSE_CONTINUE; | |
3024 | } | |
3025 | ||
d5b605df | 3026 | case Expression::EXPRESSION_VAR_REFERENCE: |
3027 | if ((*pexpr)->var_expression()->named_object() == this->no_) | |
3028 | break; | |
3029 | return TRAVERSE_CONTINUE; | |
3030 | case Expression::EXPRESSION_FUNC_REFERENCE: | |
3031 | if ((*pexpr)->func_expression()->named_object() == this->no_) | |
3032 | break; | |
3033 | return TRAVERSE_CONTINUE; | |
3034 | default: | |
3035 | return TRAVERSE_CONTINUE; | |
3036 | } | |
3037 | this->found_ = true; | |
3038 | return TRAVERSE_EXIT; | |
3039 | } | |
3040 | ||
e440a328 | 3041 | // The nil value. |
3042 | ||
3043 | class Nil_expression : public Expression | |
3044 | { | |
3045 | public: | |
b13c66cd | 3046 | Nil_expression(Location location) |
e440a328 | 3047 | : Expression(EXPRESSION_NIL, location) |
3048 | { } | |
3049 | ||
3050 | static Expression* | |
3051 | do_import(Import*); | |
3052 | ||
3053 | protected: | |
3054 | bool | |
3055 | do_is_constant() const | |
3056 | { return true; } | |
3057 | ||
f9ca30f9 | 3058 | bool |
3ae06f68 | 3059 | do_is_static_initializer() const |
f9ca30f9 | 3060 | { return true; } |
3061 | ||
e440a328 | 3062 | Type* |
3063 | do_type() | |
3064 | { return Type::make_nil_type(); } | |
3065 | ||
3066 | void | |
3067 | do_determine_type(const Type_context*) | |
3068 | { } | |
3069 | ||
3070 | Expression* | |
3071 | do_copy() | |
3072 | { return this; } | |
3073 | ||
ea664253 | 3074 | Bexpression* |
3075 | do_get_backend(Translate_context* context) | |
3076 | { return context->backend()->nil_pointer_expression(); } | |
e440a328 | 3077 | |
3078 | void | |
3079 | do_export(Export* exp) const | |
3080 | { exp->write_c_string("nil"); } | |
d751bb78 | 3081 | |
3082 | void | |
3083 | do_dump_expression(Ast_dump_context* ast_dump_context) const | |
3084 | { ast_dump_context->ostream() << "nil"; } | |
e440a328 | 3085 | }; |
3086 | ||
3087 | // Import a nil expression. | |
3088 | ||
3089 | Expression* | |
3090 | Nil_expression::do_import(Import* imp) | |
3091 | { | |
3092 | imp->require_c_string("nil"); | |
3093 | return Expression::make_nil(imp->location()); | |
3094 | } | |
3095 | ||
3096 | // Make a nil expression. | |
3097 | ||
3098 | Expression* | |
b13c66cd | 3099 | Expression::make_nil(Location location) |
e440a328 | 3100 | { |
3101 | return new Nil_expression(location); | |
3102 | } | |
3103 | ||
3104 | // The value of the predeclared constant iota. This is little more | |
3105 | // than a marker. This will be lowered to an integer in | |
3106 | // Const_expression::do_lower, which is where we know the value that | |
3107 | // it should have. | |
3108 | ||
3109 | class Iota_expression : public Parser_expression | |
3110 | { | |
3111 | public: | |
b13c66cd | 3112 | Iota_expression(Location location) |
e440a328 | 3113 | : Parser_expression(EXPRESSION_IOTA, location) |
3114 | { } | |
3115 | ||
3116 | protected: | |
3117 | Expression* | |
ceeb4318 | 3118 | do_lower(Gogo*, Named_object*, Statement_inserter*, int) |
c3e6f413 | 3119 | { go_unreachable(); } |
e440a328 | 3120 | |
3121 | // There should only ever be one of these. | |
3122 | Expression* | |
3123 | do_copy() | |
c3e6f413 | 3124 | { go_unreachable(); } |
d751bb78 | 3125 | |
3126 | void | |
3127 | do_dump_expression(Ast_dump_context* ast_dump_context) const | |
3128 | { ast_dump_context->ostream() << "iota"; } | |
e440a328 | 3129 | }; |
3130 | ||
3131 | // Make an iota expression. This is only called for one case: the | |
3132 | // value of the predeclared constant iota. | |
3133 | ||
3134 | Expression* | |
3135 | Expression::make_iota() | |
3136 | { | |
b13c66cd | 3137 | static Iota_expression iota_expression(Linemap::unknown_location()); |
e440a328 | 3138 | return &iota_expression; |
3139 | } | |
3140 | ||
da244e59 | 3141 | // Class Type_conversion_expression. |
e440a328 | 3142 | |
3143 | // Traversal. | |
3144 | ||
3145 | int | |
3146 | Type_conversion_expression::do_traverse(Traverse* traverse) | |
3147 | { | |
3148 | if (Expression::traverse(&this->expr_, traverse) == TRAVERSE_EXIT | |
3149 | || Type::traverse(this->type_, traverse) == TRAVERSE_EXIT) | |
3150 | return TRAVERSE_EXIT; | |
3151 | return TRAVERSE_CONTINUE; | |
3152 | } | |
3153 | ||
3154 | // Convert to a constant at lowering time. | |
3155 | ||
3156 | Expression* | |
ceeb4318 | 3157 | Type_conversion_expression::do_lower(Gogo*, Named_object*, |
3158 | Statement_inserter*, int) | |
e440a328 | 3159 | { |
3160 | Type* type = this->type_; | |
3161 | Expression* val = this->expr_; | |
b13c66cd | 3162 | Location location = this->location(); |
e440a328 | 3163 | |
0c77715b | 3164 | if (type->is_numeric_type()) |
e440a328 | 3165 | { |
0c77715b | 3166 | Numeric_constant nc; |
3167 | if (val->numeric_constant_value(&nc)) | |
e440a328 | 3168 | { |
0c77715b | 3169 | if (!nc.set_type(type, true, location)) |
3170 | return Expression::make_error(location); | |
3171 | return nc.expression(location); | |
e440a328 | 3172 | } |
e440a328 | 3173 | } |
3174 | ||
d7739c9a | 3175 | // According to the language specification on string conversions |
3176 | // (http://golang.org/ref/spec#Conversions_to_and_from_a_string_type): | |
3177 | // When converting an integer into a string, the string will be a UTF-8 | |
3178 | // representation of the integer and integers "outside the range of valid | |
3179 | // Unicode code points are converted to '\uFFFD'." | |
3180 | if (type->is_string_type()) | |
3181 | { | |
3182 | Numeric_constant nc; | |
3183 | if (val->numeric_constant_value(&nc) && nc.is_int()) | |
3184 | { | |
3185 | // An integer value doesn't fit in the Unicode code point range if it | |
3186 | // overflows the Go "int" type or is negative. | |
3187 | unsigned long ul; | |
3188 | if (!nc.set_type(Type::lookup_integer_type("int"), false, location) | |
3189 | || nc.to_unsigned_long(&ul) == Numeric_constant::NC_UL_NEGATIVE) | |
3190 | return Expression::make_string("\ufffd", location); | |
3191 | } | |
3192 | } | |
3193 | ||
55072f2b | 3194 | if (type->is_slice_type()) |
e440a328 | 3195 | { |
3196 | Type* element_type = type->array_type()->element_type()->forwarded(); | |
60963afd | 3197 | bool is_byte = (element_type->integer_type() != NULL |
3198 | && element_type->integer_type()->is_byte()); | |
3199 | bool is_rune = (element_type->integer_type() != NULL | |
3200 | && element_type->integer_type()->is_rune()); | |
3201 | if (is_byte || is_rune) | |
e440a328 | 3202 | { |
3203 | std::string s; | |
3204 | if (val->string_constant_value(&s)) | |
3205 | { | |
3206 | Expression_list* vals = new Expression_list(); | |
3207 | if (is_byte) | |
3208 | { | |
3209 | for (std::string::const_iterator p = s.begin(); | |
3210 | p != s.end(); | |
3211 | p++) | |
3212 | { | |
e67508fa | 3213 | unsigned char c = static_cast<unsigned char>(*p); |
3214 | vals->push_back(Expression::make_integer_ul(c, | |
3215 | element_type, | |
3216 | location)); | |
e440a328 | 3217 | } |
3218 | } | |
3219 | else | |
3220 | { | |
3221 | const char *p = s.data(); | |
3222 | const char *pend = s.data() + s.length(); | |
3223 | while (p < pend) | |
3224 | { | |
3225 | unsigned int c; | |
3226 | int adv = Lex::fetch_char(p, &c); | |
3227 | if (adv == 0) | |
3228 | { | |
631d5788 | 3229 | go_warning_at(this->location(), 0, |
e440a328 | 3230 | "invalid UTF-8 encoding"); |
3231 | adv = 1; | |
3232 | } | |
3233 | p += adv; | |
e67508fa | 3234 | vals->push_back(Expression::make_integer_ul(c, |
3235 | element_type, | |
3236 | location)); | |
e440a328 | 3237 | } |
3238 | } | |
3239 | ||
3240 | return Expression::make_slice_composite_literal(type, vals, | |
3241 | location); | |
3242 | } | |
3243 | } | |
3244 | } | |
3245 | ||
3246 | return this; | |
3247 | } | |
3248 | ||
35a54f17 | 3249 | // Flatten a type conversion by using a temporary variable for the slice |
3250 | // in slice to string conversions. | |
3251 | ||
3252 | Expression* | |
3253 | Type_conversion_expression::do_flatten(Gogo*, Named_object*, | |
3254 | Statement_inserter* inserter) | |
3255 | { | |
5bf8be8b | 3256 | if (this->type()->is_error_type() || this->expr_->is_error_expression()) |
3257 | { | |
3258 | go_assert(saw_errors()); | |
3259 | return Expression::make_error(this->location()); | |
3260 | } | |
3261 | ||
2c809f8f | 3262 | if (((this->type()->is_string_type() |
3263 | && this->expr_->type()->is_slice_type()) | |
8ba8cc87 | 3264 | || this->expr_->type()->interface_type() != NULL) |
35a54f17 | 3265 | && !this->expr_->is_variable()) |
3266 | { | |
3267 | Temporary_statement* temp = | |
3268 | Statement::make_temporary(NULL, this->expr_, this->location()); | |
3269 | inserter->insert(temp); | |
3270 | this->expr_ = Expression::make_temporary_reference(temp, this->location()); | |
3271 | } | |
3272 | return this; | |
3273 | } | |
3274 | ||
1ca01a59 | 3275 | // Return whether a type conversion is a constant. |
3276 | ||
3277 | bool | |
3278 | Type_conversion_expression::do_is_constant() const | |
3279 | { | |
3280 | if (!this->expr_->is_constant()) | |
3281 | return false; | |
3282 | ||
3283 | // A conversion to a type that may not be used as a constant is not | |
3284 | // a constant. For example, []byte(nil). | |
3285 | Type* type = this->type_; | |
3286 | if (type->integer_type() == NULL | |
3287 | && type->float_type() == NULL | |
3288 | && type->complex_type() == NULL | |
3289 | && !type->is_boolean_type() | |
3290 | && !type->is_string_type()) | |
3291 | return false; | |
3292 | ||
3293 | return true; | |
3294 | } | |
3295 | ||
3ae06f68 | 3296 | // Return whether a type conversion can be used in a constant |
3297 | // initializer. | |
0e168074 | 3298 | |
3299 | bool | |
3ae06f68 | 3300 | Type_conversion_expression::do_is_static_initializer() const |
0e168074 | 3301 | { |
3302 | Type* type = this->type_; | |
3303 | Type* expr_type = this->expr_->type(); | |
3304 | ||
3305 | if (type->interface_type() != NULL | |
3306 | || expr_type->interface_type() != NULL) | |
3307 | return false; | |
3308 | ||
3ae06f68 | 3309 | if (!this->expr_->is_static_initializer()) |
0e168074 | 3310 | return false; |
3311 | ||
3312 | if (Type::are_identical(type, expr_type, false, NULL)) | |
3313 | return true; | |
3314 | ||
03118c21 | 3315 | if (type->is_string_type() && expr_type->is_string_type()) |
3316 | return true; | |
3317 | ||
3318 | if ((type->is_numeric_type() | |
3319 | || type->is_boolean_type() | |
3320 | || type->points_to() != NULL) | |
3321 | && (expr_type->is_numeric_type() | |
3322 | || expr_type->is_boolean_type() | |
3323 | || expr_type->points_to() != NULL)) | |
3324 | return true; | |
3325 | ||
3326 | return false; | |
0e168074 | 3327 | } |
3328 | ||
0c77715b | 3329 | // Return the constant numeric value if there is one. |
e440a328 | 3330 | |
3331 | bool | |
0c77715b | 3332 | Type_conversion_expression::do_numeric_constant_value( |
3333 | Numeric_constant* nc) const | |
e440a328 | 3334 | { |
0c77715b | 3335 | if (!this->type_->is_numeric_type()) |
e440a328 | 3336 | return false; |
0c77715b | 3337 | if (!this->expr_->numeric_constant_value(nc)) |
e440a328 | 3338 | return false; |
0c77715b | 3339 | return nc->set_type(this->type_, false, this->location()); |
e440a328 | 3340 | } |
3341 | ||
3342 | // Return the constant string value if there is one. | |
3343 | ||
3344 | bool | |
3345 | Type_conversion_expression::do_string_constant_value(std::string* val) const | |
3346 | { | |
3347 | if (this->type_->is_string_type() | |
3348 | && this->expr_->type()->integer_type() != NULL) | |
3349 | { | |
0c77715b | 3350 | Numeric_constant nc; |
3351 | if (this->expr_->numeric_constant_value(&nc)) | |
e440a328 | 3352 | { |
0c77715b | 3353 | unsigned long ival; |
3354 | if (nc.to_unsigned_long(&ival) == Numeric_constant::NC_UL_VALID) | |
e440a328 | 3355 | { |
0c77715b | 3356 | val->clear(); |
3357 | Lex::append_char(ival, true, val, this->location()); | |
e440a328 | 3358 | return true; |
3359 | } | |
3360 | } | |
e440a328 | 3361 | } |
3362 | ||
3363 | // FIXME: Could handle conversion from const []int here. | |
3364 | ||
3365 | return false; | |
3366 | } | |
3367 | ||
da244e59 | 3368 | // Determine the resulting type of the conversion. |
3369 | ||
3370 | void | |
3371 | Type_conversion_expression::do_determine_type(const Type_context*) | |
3372 | { | |
3373 | Type_context subcontext(this->type_, false); | |
3374 | this->expr_->determine_type(&subcontext); | |
3375 | } | |
3376 | ||
e440a328 | 3377 | // Check that types are convertible. |
3378 | ||
3379 | void | |
3380 | Type_conversion_expression::do_check_types(Gogo*) | |
3381 | { | |
3382 | Type* type = this->type_; | |
3383 | Type* expr_type = this->expr_->type(); | |
3384 | std::string reason; | |
3385 | ||
5c13bd80 | 3386 | if (type->is_error() || expr_type->is_error()) |
842f6425 | 3387 | { |
842f6425 | 3388 | this->set_is_error(); |
3389 | return; | |
3390 | } | |
3391 | ||
e440a328 | 3392 | if (this->may_convert_function_types_ |
3393 | && type->function_type() != NULL | |
3394 | && expr_type->function_type() != NULL) | |
3395 | return; | |
3396 | ||
3397 | if (Type::are_convertible(type, expr_type, &reason)) | |
3398 | return; | |
3399 | ||
631d5788 | 3400 | go_error_at(this->location(), "%s", reason.c_str()); |
e440a328 | 3401 | this->set_is_error(); |
3402 | } | |
3403 | ||
ea664253 | 3404 | // Get the backend representation for a type conversion. |
e440a328 | 3405 | |
ea664253 | 3406 | Bexpression* |
3407 | Type_conversion_expression::do_get_backend(Translate_context* context) | |
e440a328 | 3408 | { |
e440a328 | 3409 | Type* type = this->type_; |
3410 | Type* expr_type = this->expr_->type(); | |
2c809f8f | 3411 | |
3412 | Gogo* gogo = context->gogo(); | |
3413 | Btype* btype = type->get_backend(gogo); | |
2c809f8f | 3414 | Location loc = this->location(); |
3415 | ||
3416 | if (Type::are_identical(type, expr_type, false, NULL)) | |
859cdc93 | 3417 | { |
3418 | Bexpression* bexpr = this->expr_->get_backend(context); | |
3419 | return gogo->backend()->convert_expression(btype, bexpr, loc); | |
3420 | } | |
2c809f8f | 3421 | else if (type->interface_type() != NULL |
3422 | || expr_type->interface_type() != NULL) | |
e440a328 | 3423 | { |
2c809f8f | 3424 | Expression* conversion = |
3425 | Expression::convert_for_assignment(gogo, type, this->expr_, | |
3426 | this->location()); | |
ea664253 | 3427 | return conversion->get_backend(context); |
e440a328 | 3428 | } |
3429 | else if (type->is_string_type() | |
3430 | && expr_type->integer_type() != NULL) | |
3431 | { | |
2c809f8f | 3432 | mpz_t intval; |
3433 | Numeric_constant nc; | |
3434 | if (this->expr_->numeric_constant_value(&nc) | |
3435 | && nc.to_int(&intval) | |
3436 | && mpz_fits_ushort_p(intval)) | |
e440a328 | 3437 | { |
e440a328 | 3438 | std::string s; |
2c809f8f | 3439 | Lex::append_char(mpz_get_ui(intval), true, &s, loc); |
3440 | mpz_clear(intval); | |
3441 | Expression* se = Expression::make_string(s, loc); | |
ea664253 | 3442 | return se->get_backend(context); |
e440a328 | 3443 | } |
3444 | ||
f16ab008 | 3445 | Expression* i2s_expr = |
736a16ba | 3446 | Runtime::make_call(Runtime::INTSTRING, loc, 2, |
3447 | Expression::make_nil(loc), this->expr_); | |
ea664253 | 3448 | return Expression::make_cast(type, i2s_expr, loc)->get_backend(context); |
e440a328 | 3449 | } |
55072f2b | 3450 | else if (type->is_string_type() && expr_type->is_slice_type()) |
e440a328 | 3451 | { |
55072f2b | 3452 | Array_type* a = expr_type->array_type(); |
e440a328 | 3453 | Type* e = a->element_type()->forwarded(); |
c484d925 | 3454 | go_assert(e->integer_type() != NULL); |
35a54f17 | 3455 | go_assert(this->expr_->is_variable()); |
3456 | ||
3457 | Runtime::Function code; | |
60963afd | 3458 | if (e->integer_type()->is_byte()) |
736a16ba | 3459 | code = Runtime::SLICEBYTETOSTRING; |
e440a328 | 3460 | else |
35a54f17 | 3461 | { |
3462 | go_assert(e->integer_type()->is_rune()); | |
736a16ba | 3463 | code = Runtime::SLICERUNETOSTRING; |
35a54f17 | 3464 | } |
736a16ba | 3465 | return Runtime::make_call(code, loc, 2, Expression::make_nil(loc), |
3466 | this->expr_)->get_backend(context); | |
e440a328 | 3467 | } |
411eb89e | 3468 | else if (type->is_slice_type() && expr_type->is_string_type()) |
e440a328 | 3469 | { |
3470 | Type* e = type->array_type()->element_type()->forwarded(); | |
c484d925 | 3471 | go_assert(e->integer_type() != NULL); |
6c252e42 | 3472 | |
2c809f8f | 3473 | Runtime::Function code; |
60963afd | 3474 | if (e->integer_type()->is_byte()) |
736a16ba | 3475 | code = Runtime::STRINGTOSLICEBYTE; |
e440a328 | 3476 | else |
3477 | { | |
60963afd | 3478 | go_assert(e->integer_type()->is_rune()); |
736a16ba | 3479 | code = Runtime::STRINGTOSLICERUNE; |
e440a328 | 3480 | } |
736a16ba | 3481 | Expression* s2a = Runtime::make_call(code, loc, 2, |
3482 | Expression::make_nil(loc), | |
3483 | this->expr_); | |
ea664253 | 3484 | return Expression::make_unsafe_cast(type, s2a, loc)->get_backend(context); |
2c809f8f | 3485 | } |
3486 | else if (type->is_numeric_type()) | |
3487 | { | |
3488 | go_assert(Type::are_convertible(type, expr_type, NULL)); | |
859cdc93 | 3489 | Bexpression* bexpr = this->expr_->get_backend(context); |
ea664253 | 3490 | return gogo->backend()->convert_expression(btype, bexpr, loc); |
e440a328 | 3491 | } |
3492 | else if ((type->is_unsafe_pointer_type() | |
2c809f8f | 3493 | && (expr_type->points_to() != NULL |
3494 | || expr_type->integer_type())) | |
3495 | || (expr_type->is_unsafe_pointer_type() | |
3496 | && type->points_to() != NULL) | |
3497 | || (this->may_convert_function_types_ | |
3498 | && type->function_type() != NULL | |
3499 | && expr_type->function_type() != NULL)) | |
859cdc93 | 3500 | { |
3501 | Bexpression* bexpr = this->expr_->get_backend(context); | |
3502 | return gogo->backend()->convert_expression(btype, bexpr, loc); | |
3503 | } | |
e440a328 | 3504 | else |
2c809f8f | 3505 | { |
3506 | Expression* conversion = | |
3507 | Expression::convert_for_assignment(gogo, type, this->expr_, loc); | |
ea664253 | 3508 | return conversion->get_backend(context); |
2c809f8f | 3509 | } |
e440a328 | 3510 | } |
3511 | ||
3512 | // Output a type conversion in a constant expression. | |
3513 | ||
3514 | void | |
3515 | Type_conversion_expression::do_export(Export* exp) const | |
3516 | { | |
3517 | exp->write_c_string("convert("); | |
3518 | exp->write_type(this->type_); | |
3519 | exp->write_c_string(", "); | |
3520 | this->expr_->export_expression(exp); | |
3521 | exp->write_c_string(")"); | |
3522 | } | |
3523 | ||
3524 | // Import a type conversion or a struct construction. | |
3525 | ||
3526 | Expression* | |
3527 | Type_conversion_expression::do_import(Import* imp) | |
3528 | { | |
3529 | imp->require_c_string("convert("); | |
3530 | Type* type = imp->read_type(); | |
3531 | imp->require_c_string(", "); | |
3532 | Expression* val = Expression::import_expression(imp); | |
3533 | imp->require_c_string(")"); | |
3534 | return Expression::make_cast(type, val, imp->location()); | |
3535 | } | |
3536 | ||
d751bb78 | 3537 | // Dump ast representation for a type conversion expression. |
3538 | ||
3539 | void | |
3540 | Type_conversion_expression::do_dump_expression( | |
3541 | Ast_dump_context* ast_dump_context) const | |
3542 | { | |
3543 | ast_dump_context->dump_type(this->type_); | |
3544 | ast_dump_context->ostream() << "("; | |
3545 | ast_dump_context->dump_expression(this->expr_); | |
3546 | ast_dump_context->ostream() << ") "; | |
3547 | } | |
3548 | ||
e440a328 | 3549 | // Make a type cast expression. |
3550 | ||
3551 | Expression* | |
b13c66cd | 3552 | Expression::make_cast(Type* type, Expression* val, Location location) |
e440a328 | 3553 | { |
3554 | if (type->is_error_type() || val->is_error_expression()) | |
3555 | return Expression::make_error(location); | |
3556 | return new Type_conversion_expression(type, val, location); | |
3557 | } | |
3558 | ||
98f62f7a | 3559 | // Class Unsafe_type_conversion_expression. |
9581e91d | 3560 | |
3561 | // Traversal. | |
3562 | ||
3563 | int | |
3564 | Unsafe_type_conversion_expression::do_traverse(Traverse* traverse) | |
3565 | { | |
3566 | if (Expression::traverse(&this->expr_, traverse) == TRAVERSE_EXIT | |
3567 | || Type::traverse(this->type_, traverse) == TRAVERSE_EXIT) | |
3568 | return TRAVERSE_EXIT; | |
3569 | return TRAVERSE_CONTINUE; | |
3570 | } | |
3571 | ||
3ae06f68 | 3572 | // Return whether an unsafe type conversion can be used as a constant |
3573 | // initializer. | |
aa5ae575 | 3574 | |
3575 | bool | |
3ae06f68 | 3576 | Unsafe_type_conversion_expression::do_is_static_initializer() const |
aa5ae575 | 3577 | { |
3578 | Type* type = this->type_; | |
3579 | Type* expr_type = this->expr_->type(); | |
3580 | ||
3581 | if (type->interface_type() != NULL | |
3582 | || expr_type->interface_type() != NULL) | |
3583 | return false; | |
3584 | ||
3ae06f68 | 3585 | if (!this->expr_->is_static_initializer()) |
aa5ae575 | 3586 | return false; |
3587 | ||
3588 | if (Type::are_convertible(type, expr_type, NULL)) | |
3589 | return true; | |
3590 | ||
03118c21 | 3591 | if (type->is_string_type() && expr_type->is_string_type()) |
3592 | return true; | |
3593 | ||
3594 | if ((type->is_numeric_type() | |
3595 | || type->is_boolean_type() | |
3596 | || type->points_to() != NULL) | |
3597 | && (expr_type->is_numeric_type() | |
3598 | || expr_type->is_boolean_type() | |
3599 | || expr_type->points_to() != NULL)) | |
3600 | return true; | |
3601 | ||
3602 | return false; | |
aa5ae575 | 3603 | } |
3604 | ||
9581e91d | 3605 | // Convert to backend representation. |
3606 | ||
ea664253 | 3607 | Bexpression* |
3608 | Unsafe_type_conversion_expression::do_get_backend(Translate_context* context) | |
9581e91d | 3609 | { |
3610 | // We are only called for a limited number of cases. | |
3611 | ||
3612 | Type* t = this->type_; | |
3613 | Type* et = this->expr_->type(); | |
5c4802f1 | 3614 | |
3615 | if (t->is_error_type() | |
3616 | || this->expr_->is_error_expression() | |
3617 | || et->is_error_type()) | |
3618 | { | |
3619 | go_assert(saw_errors()); | |
3620 | return context->backend()->error_expression(); | |
3621 | } | |
3622 | ||
2c809f8f | 3623 | if (t->array_type() != NULL) |
3624 | go_assert(et->array_type() != NULL | |
3625 | && t->is_slice_type() == et->is_slice_type()); | |
3626 | else if (t->struct_type() != NULL) | |
9581e91d | 3627 | { |
2c809f8f | 3628 | if (t->named_type() != NULL |
3629 | && et->named_type() != NULL | |
3630 | && !Type::are_convertible(t, et, NULL)) | |
3631 | { | |
3632 | go_assert(saw_errors()); | |
ea664253 | 3633 | return context->backend()->error_expression(); |
2c809f8f | 3634 | } |
3635 | ||
3636 | go_assert(et->struct_type() != NULL | |
3637 | && Type::are_convertible(t, et, NULL)); | |
3638 | } | |
3639 | else if (t->map_type() != NULL) | |
c484d925 | 3640 | go_assert(et->map_type() != NULL); |
9581e91d | 3641 | else if (t->channel_type() != NULL) |
c484d925 | 3642 | go_assert(et->channel_type() != NULL); |
09ea332d | 3643 | else if (t->points_to() != NULL) |
2c809f8f | 3644 | go_assert(et->points_to() != NULL |
3645 | || et->channel_type() != NULL | |
3646 | || et->map_type() != NULL | |
3647 | || et->function_type() != NULL | |
132ed071 | 3648 | || et->integer_type() != NULL |
2c809f8f | 3649 | || et->is_nil_type()); |
9581e91d | 3650 | else if (et->is_unsafe_pointer_type()) |
c484d925 | 3651 | go_assert(t->points_to() != NULL); |
2c809f8f | 3652 | else if (t->interface_type() != NULL) |
9581e91d | 3653 | { |
2c809f8f | 3654 | bool empty_iface = t->interface_type()->is_empty(); |
c484d925 | 3655 | go_assert(et->interface_type() != NULL |
2c809f8f | 3656 | && et->interface_type()->is_empty() == empty_iface); |
9581e91d | 3657 | } |
588e3cf9 | 3658 | else if (t->integer_type() != NULL) |
2c809f8f | 3659 | go_assert(et->is_boolean_type() |
3660 | || et->integer_type() != NULL | |
3661 | || et->function_type() != NULL | |
3662 | || et->points_to() != NULL | |
3663 | || et->map_type() != NULL | |
8ba8cc87 | 3664 | || et->channel_type() != NULL |
3665 | || et->is_nil_type()); | |
cd39797e | 3666 | else if (t->function_type() != NULL) |
3667 | go_assert(et->points_to() != NULL); | |
9581e91d | 3668 | else |
c3e6f413 | 3669 | go_unreachable(); |
9581e91d | 3670 | |
2c809f8f | 3671 | Gogo* gogo = context->gogo(); |
3672 | Btype* btype = t->get_backend(gogo); | |
ea664253 | 3673 | Bexpression* bexpr = this->expr_->get_backend(context); |
2c809f8f | 3674 | Location loc = this->location(); |
ea664253 | 3675 | return gogo->backend()->convert_expression(btype, bexpr, loc); |
9581e91d | 3676 | } |
3677 | ||
d751bb78 | 3678 | // Dump ast representation for an unsafe type conversion expression. |
3679 | ||
3680 | void | |
3681 | Unsafe_type_conversion_expression::do_dump_expression( | |
3682 | Ast_dump_context* ast_dump_context) const | |
3683 | { | |
3684 | ast_dump_context->dump_type(this->type_); | |
3685 | ast_dump_context->ostream() << "("; | |
3686 | ast_dump_context->dump_expression(this->expr_); | |
3687 | ast_dump_context->ostream() << ") "; | |
3688 | } | |
3689 | ||
9581e91d | 3690 | // Make an unsafe type conversion expression. |
3691 | ||
3692 | Expression* | |
3693 | Expression::make_unsafe_cast(Type* type, Expression* expr, | |
b13c66cd | 3694 | Location location) |
9581e91d | 3695 | { |
3696 | return new Unsafe_type_conversion_expression(type, expr, location); | |
3697 | } | |
3698 | ||
76f85fd6 | 3699 | // Class Unary_expression. |
e440a328 | 3700 | |
03118c21 | 3701 | // Call the address_taken method of the operand if needed. This is |
3702 | // called after escape analysis but before inserting write barriers. | |
3703 | ||
3704 | void | |
3705 | Unary_expression::check_operand_address_taken(Gogo* gogo) | |
3706 | { | |
3707 | if (this->op_ != OPERATOR_AND) | |
3708 | return; | |
3709 | ||
3710 | // If this->escapes_ is false at this point, then it was set to | |
3711 | // false by an explicit call to set_does_not_escape, and the value | |
3712 | // does not escape. If this->escapes_ is true, we may be able to | |
3713 | // set it to false if taking the address of a variable that does not | |
3714 | // escape. | |
3715 | Node* n = Node::make_node(this); | |
3716 | if ((n->encoding() & ESCAPE_MASK) == int(Node::ESCAPE_NONE)) | |
3717 | this->escapes_ = false; | |
3718 | ||
3719 | // When compiling the runtime, the address operator does not cause | |
3720 | // local variables to escape. When escape analysis becomes the | |
3721 | // default, this should be changed to make it an error if we have an | |
3722 | // address operator that escapes. | |
3723 | if (gogo->compiling_runtime() && gogo->package_name() == "runtime") | |
3724 | this->escapes_ = false; | |
3725 | ||
3726 | Named_object* var = NULL; | |
3727 | if (this->expr_->var_expression() != NULL) | |
3728 | var = this->expr_->var_expression()->named_object(); | |
3729 | else if (this->expr_->enclosed_var_expression() != NULL) | |
3730 | var = this->expr_->enclosed_var_expression()->variable(); | |
3731 | ||
3732 | if (this->escapes_ && var != NULL) | |
3733 | { | |
3734 | if (var->is_variable()) | |
3735 | this->escapes_ = var->var_value()->escapes(); | |
3736 | if (var->is_result_variable()) | |
3737 | this->escapes_ = var->result_var_value()->escapes(); | |
3738 | } | |
3739 | ||
3740 | this->expr_->address_taken(this->escapes_); | |
3741 | } | |
3742 | ||
e440a328 | 3743 | // If we are taking the address of a composite literal, and the |
2c809f8f | 3744 | // contents are not constant, then we want to make a heap expression |
e440a328 | 3745 | // instead. |
3746 | ||
3747 | Expression* | |
ceeb4318 | 3748 | Unary_expression::do_lower(Gogo*, Named_object*, Statement_inserter*, int) |
e440a328 | 3749 | { |
b13c66cd | 3750 | Location loc = this->location(); |
e440a328 | 3751 | Operator op = this->op_; |
3752 | Expression* expr = this->expr_; | |
3753 | ||
3754 | if (op == OPERATOR_MULT && expr->is_type_expression()) | |
3755 | return Expression::make_type(Type::make_pointer_type(expr->type()), loc); | |
3756 | ||
3757 | // *&x simplifies to x. *(*T)(unsafe.Pointer)(&x) does not require | |
3758 | // moving x to the heap. FIXME: Is it worth doing a real escape | |
3759 | // analysis here? This case is found in math/unsafe.go and is | |
3760 | // therefore worth special casing. | |
3761 | if (op == OPERATOR_MULT) | |
3762 | { | |
3763 | Expression* e = expr; | |
3764 | while (e->classification() == EXPRESSION_CONVERSION) | |
3765 | { | |
3766 | Type_conversion_expression* te | |
3767 | = static_cast<Type_conversion_expression*>(e); | |
3768 | e = te->expr(); | |
3769 | } | |
3770 | ||
3771 | if (e->classification() == EXPRESSION_UNARY) | |
3772 | { | |
3773 | Unary_expression* ue = static_cast<Unary_expression*>(e); | |
3774 | if (ue->op_ == OPERATOR_AND) | |
3775 | { | |
3776 | if (e == expr) | |
3777 | { | |
3778 | // *&x == x. | |
f4dea966 | 3779 | if (!ue->expr_->is_addressable() && !ue->create_temp_) |
3780 | { | |
631d5788 | 3781 | go_error_at(ue->location(), |
3782 | "invalid operand for unary %<&%>"); | |
f4dea966 | 3783 | this->set_is_error(); |
3784 | } | |
e440a328 | 3785 | return ue->expr_; |
3786 | } | |
3787 | ue->set_does_not_escape(); | |
3788 | } | |
3789 | } | |
3790 | } | |
3791 | ||
55661ce9 | 3792 | // Catching an invalid indirection of unsafe.Pointer here avoid |
3793 | // having to deal with TYPE_VOID in other places. | |
3794 | if (op == OPERATOR_MULT && expr->type()->is_unsafe_pointer_type()) | |
3795 | { | |
631d5788 | 3796 | go_error_at(this->location(), "invalid indirect of %<unsafe.Pointer%>"); |
55661ce9 | 3797 | return Expression::make_error(this->location()); |
3798 | } | |
3799 | ||
d9f3743a | 3800 | // Check for an invalid pointer dereference. We need to do this |
3801 | // here because Unary_expression::do_type will return an error type | |
3802 | // in this case. That can cause code to appear erroneous, and | |
3803 | // therefore disappear at lowering time, without any error message. | |
3804 | if (op == OPERATOR_MULT && expr->type()->points_to() == NULL) | |
3805 | { | |
3806 | this->report_error(_("expected pointer")); | |
3807 | return Expression::make_error(this->location()); | |
3808 | } | |
3809 | ||
59a401fe | 3810 | if (op == OPERATOR_PLUS || op == OPERATOR_MINUS || op == OPERATOR_XOR) |
e440a328 | 3811 | { |
0c77715b | 3812 | Numeric_constant nc; |
3813 | if (expr->numeric_constant_value(&nc)) | |
e440a328 | 3814 | { |
0c77715b | 3815 | Numeric_constant result; |
af7a5274 | 3816 | bool issued_error; |
3817 | if (Unary_expression::eval_constant(op, &nc, loc, &result, | |
3818 | &issued_error)) | |
0c77715b | 3819 | return result.expression(loc); |
af7a5274 | 3820 | else if (issued_error) |
3821 | return Expression::make_error(this->location()); | |
e440a328 | 3822 | } |
3823 | } | |
3824 | ||
3825 | return this; | |
3826 | } | |
3827 | ||
f9ca30f9 | 3828 | // Flatten expression if a nil check must be performed and create temporary |
3829 | // variables if necessary. | |
3830 | ||
3831 | Expression* | |
3832 | Unary_expression::do_flatten(Gogo* gogo, Named_object*, | |
3833 | Statement_inserter* inserter) | |
3834 | { | |
5bf8be8b | 3835 | if (this->is_error_expression() |
3836 | || this->expr_->is_error_expression() | |
3837 | || this->expr_->type()->is_error_type()) | |
3838 | { | |
3839 | go_assert(saw_errors()); | |
3840 | return Expression::make_error(this->location()); | |
3841 | } | |
f4dea966 | 3842 | |
f9ca30f9 | 3843 | Location location = this->location(); |
3844 | if (this->op_ == OPERATOR_MULT | |
3845 | && !this->expr_->is_variable()) | |
3846 | { | |
3847 | go_assert(this->expr_->type()->points_to() != NULL); | |
3848 | Type* ptype = this->expr_->type()->points_to(); | |
3849 | if (!ptype->is_void_type()) | |
3850 | { | |
2a305b85 | 3851 | int64_t s; |
3852 | bool ok = ptype->backend_type_size(gogo, &s); | |
3853 | if (!ok) | |
3854 | { | |
3855 | go_assert(saw_errors()); | |
3856 | return Expression::make_error(this->location()); | |
3857 | } | |
f9ca30f9 | 3858 | if (s >= 4096 || this->issue_nil_check_) |
3859 | { | |
3860 | Temporary_statement* temp = | |
3861 | Statement::make_temporary(NULL, this->expr_, location); | |
3862 | inserter->insert(temp); | |
3863 | this->expr_ = | |
3864 | Expression::make_temporary_reference(temp, location); | |
3865 | } | |
3866 | } | |
3867 | } | |
3868 | ||
3869 | if (this->create_temp_ && !this->expr_->is_variable()) | |
3870 | { | |
3871 | Temporary_statement* temp = | |
3872 | Statement::make_temporary(NULL, this->expr_, location); | |
3873 | inserter->insert(temp); | |
3874 | this->expr_ = Expression::make_temporary_reference(temp, location); | |
3875 | } | |
3876 | ||
3877 | return this; | |
3878 | } | |
3879 | ||
e440a328 | 3880 | // Return whether a unary expression is a constant. |
3881 | ||
3882 | bool | |
3883 | Unary_expression::do_is_constant() const | |
3884 | { | |
3885 | if (this->op_ == OPERATOR_MULT) | |
3886 | { | |
3887 | // Indirecting through a pointer is only constant if the object | |
3888 | // to which the expression points is constant, but we currently | |
3889 | // have no way to determine that. | |
3890 | return false; | |
3891 | } | |
3892 | else if (this->op_ == OPERATOR_AND) | |
3893 | { | |
3894 | // Taking the address of a variable is constant if it is a | |
f9ca30f9 | 3895 | // global variable, not constant otherwise. In other cases taking the |
3896 | // address is probably not a constant. | |
e440a328 | 3897 | Var_expression* ve = this->expr_->var_expression(); |
3898 | if (ve != NULL) | |
3899 | { | |
3900 | Named_object* no = ve->named_object(); | |
3901 | return no->is_variable() && no->var_value()->is_global(); | |
3902 | } | |
3903 | return false; | |
3904 | } | |
3905 | else | |
3906 | return this->expr_->is_constant(); | |
3907 | } | |
3908 | ||
3ae06f68 | 3909 | // Return whether a unary expression can be used as a constant |
3910 | // initializer. | |
3911 | ||
3912 | bool | |
3913 | Unary_expression::do_is_static_initializer() const | |
3914 | { | |
3915 | if (this->op_ == OPERATOR_MULT) | |
3916 | return false; | |
3917 | else if (this->op_ == OPERATOR_AND) | |
de048538 | 3918 | return Unary_expression::base_is_static_initializer(this->expr_); |
3919 | else | |
3920 | return this->expr_->is_static_initializer(); | |
3921 | } | |
3ae06f68 | 3922 | |
de048538 | 3923 | // Return whether the address of EXPR can be used as a static |
3924 | // initializer. | |
3ae06f68 | 3925 | |
de048538 | 3926 | bool |
3927 | Unary_expression::base_is_static_initializer(Expression* expr) | |
3928 | { | |
3929 | // The address of a field reference can be a static initializer if | |
3930 | // the base can be a static initializer. | |
3931 | Field_reference_expression* fre = expr->field_reference_expression(); | |
3932 | if (fre != NULL) | |
3933 | return Unary_expression::base_is_static_initializer(fre->expr()); | |
3934 | ||
3935 | // The address of an index expression can be a static initializer if | |
3936 | // the base can be a static initializer and the index is constant. | |
3937 | Array_index_expression* aind = expr->array_index_expression(); | |
3938 | if (aind != NULL) | |
3939 | return (aind->end() == NULL | |
3940 | && aind->start()->is_constant() | |
3941 | && Unary_expression::base_is_static_initializer(aind->array())); | |
3942 | ||
3943 | // The address of a global variable can be a static initializer. | |
3944 | Var_expression* ve = expr->var_expression(); | |
3945 | if (ve != NULL) | |
3946 | { | |
3947 | Named_object* no = ve->named_object(); | |
3948 | return no->is_variable() && no->var_value()->is_global(); | |
3949 | } | |
3950 | ||
3951 | // The address of a composite literal can be used as a static | |
3952 | // initializer if the composite literal is itself usable as a | |
3953 | // static initializer. | |
3954 | if (expr->is_composite_literal() && expr->is_static_initializer()) | |
3955 | return true; | |
3ae06f68 | 3956 | |
de048538 | 3957 | // The address of a string constant can be used as a static |
3958 | // initializer. This can not be written in Go itself but this is | |
3959 | // used when building a type descriptor. | |
3960 | if (expr->string_expression() != NULL) | |
3961 | return true; | |
3962 | ||
3963 | return false; | |
3ae06f68 | 3964 | } |
3965 | ||
0c77715b | 3966 | // Apply unary opcode OP to UNC, setting NC. Return true if this |
af7a5274 | 3967 | // could be done, false if not. On overflow, issues an error and sets |
3968 | // *ISSUED_ERROR. | |
e440a328 | 3969 | |
3970 | bool | |
0c77715b | 3971 | Unary_expression::eval_constant(Operator op, const Numeric_constant* unc, |
af7a5274 | 3972 | Location location, Numeric_constant* nc, |
3973 | bool* issued_error) | |
e440a328 | 3974 | { |
af7a5274 | 3975 | *issued_error = false; |
e440a328 | 3976 | switch (op) |
3977 | { | |
3978 | case OPERATOR_PLUS: | |
0c77715b | 3979 | *nc = *unc; |
e440a328 | 3980 | return true; |
0c77715b | 3981 | |
e440a328 | 3982 | case OPERATOR_MINUS: |
0c77715b | 3983 | if (unc->is_int() || unc->is_rune()) |
3984 | break; | |
3985 | else if (unc->is_float()) | |
3986 | { | |
3987 | mpfr_t uval; | |
3988 | unc->get_float(&uval); | |
3989 | mpfr_t val; | |
3990 | mpfr_init(val); | |
3991 | mpfr_neg(val, uval, GMP_RNDN); | |
3992 | nc->set_float(unc->type(), val); | |
3993 | mpfr_clear(uval); | |
3994 | mpfr_clear(val); | |
3995 | return true; | |
3996 | } | |
3997 | else if (unc->is_complex()) | |
3998 | { | |
fcbea5e4 | 3999 | mpc_t uval; |
4000 | unc->get_complex(&uval); | |
4001 | mpc_t val; | |
4002 | mpc_init2(val, mpc_precision); | |
4003 | mpc_neg(val, uval, MPC_RNDNN); | |
4004 | nc->set_complex(unc->type(), val); | |
4005 | mpc_clear(uval); | |
4006 | mpc_clear(val); | |
0c77715b | 4007 | return true; |
4008 | } | |
e440a328 | 4009 | else |
0c77715b | 4010 | go_unreachable(); |
e440a328 | 4011 | |
0c77715b | 4012 | case OPERATOR_XOR: |
4013 | break; | |
68448d53 | 4014 | |
59a401fe | 4015 | case OPERATOR_NOT: |
e440a328 | 4016 | case OPERATOR_AND: |
4017 | case OPERATOR_MULT: | |
4018 | return false; | |
0c77715b | 4019 | |
e440a328 | 4020 | default: |
c3e6f413 | 4021 | go_unreachable(); |
e440a328 | 4022 | } |
e440a328 | 4023 | |
0c77715b | 4024 | if (!unc->is_int() && !unc->is_rune()) |
4025 | return false; | |
4026 | ||
4027 | mpz_t uval; | |
8387e1df | 4028 | if (unc->is_rune()) |
4029 | unc->get_rune(&uval); | |
4030 | else | |
4031 | unc->get_int(&uval); | |
0c77715b | 4032 | mpz_t val; |
4033 | mpz_init(val); | |
e440a328 | 4034 | |
e440a328 | 4035 | switch (op) |
4036 | { | |
e440a328 | 4037 | case OPERATOR_MINUS: |
0c77715b | 4038 | mpz_neg(val, uval); |
4039 | break; | |
4040 | ||
e440a328 | 4041 | case OPERATOR_NOT: |
0c77715b | 4042 | mpz_set_ui(val, mpz_cmp_si(uval, 0) == 0 ? 1 : 0); |
4043 | break; | |
4044 | ||
e440a328 | 4045 | case OPERATOR_XOR: |
0c77715b | 4046 | { |
4047 | Type* utype = unc->type(); | |
4048 | if (utype->integer_type() == NULL | |
4049 | || utype->integer_type()->is_abstract()) | |
4050 | mpz_com(val, uval); | |
4051 | else | |
4052 | { | |
4053 | // The number of HOST_WIDE_INTs that it takes to represent | |
4054 | // UVAL. | |
4055 | size_t count = ((mpz_sizeinbase(uval, 2) | |
4056 | + HOST_BITS_PER_WIDE_INT | |
4057 | - 1) | |
4058 | / HOST_BITS_PER_WIDE_INT); | |
e440a328 | 4059 | |
0c77715b | 4060 | unsigned HOST_WIDE_INT* phwi = new unsigned HOST_WIDE_INT[count]; |
4061 | memset(phwi, 0, count * sizeof(HOST_WIDE_INT)); | |
4062 | ||
4063 | size_t obits = utype->integer_type()->bits(); | |
4064 | ||
4065 | if (!utype->integer_type()->is_unsigned() && mpz_sgn(uval) < 0) | |
4066 | { | |
4067 | mpz_t adj; | |
4068 | mpz_init_set_ui(adj, 1); | |
4069 | mpz_mul_2exp(adj, adj, obits); | |
4070 | mpz_add(uval, uval, adj); | |
4071 | mpz_clear(adj); | |
4072 | } | |
4073 | ||
4074 | size_t ecount; | |
4075 | mpz_export(phwi, &ecount, -1, sizeof(HOST_WIDE_INT), 0, 0, uval); | |
4076 | go_assert(ecount <= count); | |
4077 | ||
4078 | // Trim down to the number of words required by the type. | |
4079 | size_t ocount = ((obits + HOST_BITS_PER_WIDE_INT - 1) | |
4080 | / HOST_BITS_PER_WIDE_INT); | |
4081 | go_assert(ocount <= count); | |
4082 | ||
4083 | for (size_t i = 0; i < ocount; ++i) | |
4084 | phwi[i] = ~phwi[i]; | |
4085 | ||
4086 | size_t clearbits = ocount * HOST_BITS_PER_WIDE_INT - obits; | |
4087 | if (clearbits != 0) | |
4088 | phwi[ocount - 1] &= (((unsigned HOST_WIDE_INT) (HOST_WIDE_INT) -1) | |
4089 | >> clearbits); | |
4090 | ||
4091 | mpz_import(val, ocount, -1, sizeof(HOST_WIDE_INT), 0, 0, phwi); | |
4092 | ||
4093 | if (!utype->integer_type()->is_unsigned() | |
4094 | && mpz_tstbit(val, obits - 1)) | |
4095 | { | |
4096 | mpz_t adj; | |
4097 | mpz_init_set_ui(adj, 1); | |
4098 | mpz_mul_2exp(adj, adj, obits); | |
4099 | mpz_sub(val, val, adj); | |
4100 | mpz_clear(adj); | |
4101 | } | |
4102 | ||
4103 | delete[] phwi; | |
4104 | } | |
4105 | } | |
4106 | break; | |
e440a328 | 4107 | |
e440a328 | 4108 | default: |
c3e6f413 | 4109 | go_unreachable(); |
e440a328 | 4110 | } |
e440a328 | 4111 | |
0c77715b | 4112 | if (unc->is_rune()) |
4113 | nc->set_rune(NULL, val); | |
e440a328 | 4114 | else |
0c77715b | 4115 | nc->set_int(NULL, val); |
e440a328 | 4116 | |
0c77715b | 4117 | mpz_clear(uval); |
4118 | mpz_clear(val); | |
e440a328 | 4119 | |
af7a5274 | 4120 | if (!nc->set_type(unc->type(), true, location)) |
4121 | { | |
4122 | *issued_error = true; | |
4123 | return false; | |
4124 | } | |
4125 | return true; | |
e440a328 | 4126 | } |
4127 | ||
0c77715b | 4128 | // Return the integral constant value of a unary expression, if it has one. |
e440a328 | 4129 | |
4130 | bool | |
0c77715b | 4131 | Unary_expression::do_numeric_constant_value(Numeric_constant* nc) const |
e440a328 | 4132 | { |
0c77715b | 4133 | Numeric_constant unc; |
4134 | if (!this->expr_->numeric_constant_value(&unc)) | |
4135 | return false; | |
af7a5274 | 4136 | bool issued_error; |
0c77715b | 4137 | return Unary_expression::eval_constant(this->op_, &unc, this->location(), |
af7a5274 | 4138 | nc, &issued_error); |
e440a328 | 4139 | } |
4140 | ||
4141 | // Return the type of a unary expression. | |
4142 | ||
4143 | Type* | |
4144 | Unary_expression::do_type() | |
4145 | { | |
4146 | switch (this->op_) | |
4147 | { | |
4148 | case OPERATOR_PLUS: | |
4149 | case OPERATOR_MINUS: | |
4150 | case OPERATOR_NOT: | |
4151 | case OPERATOR_XOR: | |
4152 | return this->expr_->type(); | |
4153 | ||
4154 | case OPERATOR_AND: | |
4155 | return Type::make_pointer_type(this->expr_->type()); | |
4156 | ||
4157 | case OPERATOR_MULT: | |
4158 | { | |
4159 | Type* subtype = this->expr_->type(); | |
4160 | Type* points_to = subtype->points_to(); | |
4161 | if (points_to == NULL) | |
4162 | return Type::make_error_type(); | |
4163 | return points_to; | |
4164 | } | |
4165 | ||
4166 | default: | |
c3e6f413 | 4167 | go_unreachable(); |
e440a328 | 4168 | } |
4169 | } | |
4170 | ||
4171 | // Determine abstract types for a unary expression. | |
4172 | ||
4173 | void | |
4174 | Unary_expression::do_determine_type(const Type_context* context) | |
4175 | { | |
4176 | switch (this->op_) | |
4177 | { | |
4178 | case OPERATOR_PLUS: | |
4179 | case OPERATOR_MINUS: | |
4180 | case OPERATOR_NOT: | |
4181 | case OPERATOR_XOR: | |
4182 | this->expr_->determine_type(context); | |
4183 | break; | |
4184 | ||
4185 | case OPERATOR_AND: | |
4186 | // Taking the address of something. | |
4187 | { | |
4188 | Type* subtype = (context->type == NULL | |
4189 | ? NULL | |
4190 | : context->type->points_to()); | |
4191 | Type_context subcontext(subtype, false); | |
4192 | this->expr_->determine_type(&subcontext); | |
4193 | } | |
4194 | break; | |
4195 | ||
4196 | case OPERATOR_MULT: | |
4197 | // Indirecting through a pointer. | |
4198 | { | |
4199 | Type* subtype = (context->type == NULL | |
4200 | ? NULL | |
4201 | : Type::make_pointer_type(context->type)); | |
4202 | Type_context subcontext(subtype, false); | |
4203 | this->expr_->determine_type(&subcontext); | |
4204 | } | |
4205 | break; | |
4206 | ||
4207 | default: | |
c3e6f413 | 4208 | go_unreachable(); |
e440a328 | 4209 | } |
4210 | } | |
4211 | ||
4212 | // Check types for a unary expression. | |
4213 | ||
4214 | void | |
4215 | Unary_expression::do_check_types(Gogo*) | |
4216 | { | |
9fe897ef | 4217 | Type* type = this->expr_->type(); |
5c13bd80 | 4218 | if (type->is_error()) |
9fe897ef | 4219 | { |
4220 | this->set_is_error(); | |
4221 | return; | |
4222 | } | |
4223 | ||
e440a328 | 4224 | switch (this->op_) |
4225 | { | |
4226 | case OPERATOR_PLUS: | |
4227 | case OPERATOR_MINUS: | |
9fe897ef | 4228 | if (type->integer_type() == NULL |
4229 | && type->float_type() == NULL | |
4230 | && type->complex_type() == NULL) | |
4231 | this->report_error(_("expected numeric type")); | |
e440a328 | 4232 | break; |
4233 | ||
4234 | case OPERATOR_NOT: | |
59a401fe | 4235 | if (!type->is_boolean_type()) |
4236 | this->report_error(_("expected boolean type")); | |
4237 | break; | |
4238 | ||
e440a328 | 4239 | case OPERATOR_XOR: |
b3b1474e | 4240 | if (type->integer_type() == NULL) |
4241 | this->report_error(_("expected integer")); | |
e440a328 | 4242 | break; |
4243 | ||
4244 | case OPERATOR_AND: | |
4245 | if (!this->expr_->is_addressable()) | |
09ea332d | 4246 | { |
4247 | if (!this->create_temp_) | |
f4dea966 | 4248 | { |
631d5788 | 4249 | go_error_at(this->location(), "invalid operand for unary %<&%>"); |
f4dea966 | 4250 | this->set_is_error(); |
4251 | } | |
09ea332d | 4252 | } |
e440a328 | 4253 | else |
da244e59 | 4254 | this->expr_->issue_nil_check(); |
e440a328 | 4255 | break; |
4256 | ||
4257 | case OPERATOR_MULT: | |
4258 | // Indirecting through a pointer. | |
9fe897ef | 4259 | if (type->points_to() == NULL) |
4260 | this->report_error(_("expected pointer")); | |
7661d702 | 4261 | if (type->points_to()->is_error()) |
4262 | this->set_is_error(); | |
e440a328 | 4263 | break; |
4264 | ||
4265 | default: | |
c3e6f413 | 4266 | go_unreachable(); |
e440a328 | 4267 | } |
4268 | } | |
4269 | ||
ea664253 | 4270 | // Get the backend representation for a unary expression. |
e440a328 | 4271 | |
ea664253 | 4272 | Bexpression* |
4273 | Unary_expression::do_get_backend(Translate_context* context) | |
e440a328 | 4274 | { |
1b1f2abf | 4275 | Gogo* gogo = context->gogo(); |
e9d3367e | 4276 | Location loc = this->location(); |
4277 | ||
4278 | // Taking the address of a set-and-use-temporary expression requires | |
4279 | // setting the temporary and then taking the address. | |
4280 | if (this->op_ == OPERATOR_AND) | |
4281 | { | |
4282 | Set_and_use_temporary_expression* sut = | |
4283 | this->expr_->set_and_use_temporary_expression(); | |
4284 | if (sut != NULL) | |
4285 | { | |
4286 | Temporary_statement* temp = sut->temporary(); | |
4287 | Bvariable* bvar = temp->get_backend_variable(context); | |
d4e6573e | 4288 | Bexpression* bvar_expr = |
4289 | gogo->backend()->var_expression(bvar, VE_lvalue, loc); | |
ea664253 | 4290 | Bexpression* bval = sut->expression()->get_backend(context); |
f9ca30f9 | 4291 | |
0ab48656 | 4292 | Named_object* fn = context->function(); |
4293 | go_assert(fn != NULL); | |
4294 | Bfunction* bfn = | |
4295 | fn->func_value()->get_or_make_decl(gogo, fn); | |
f9ca30f9 | 4296 | Bstatement* bassign = |
0ab48656 | 4297 | gogo->backend()->assignment_statement(bfn, bvar_expr, bval, loc); |
f9ca30f9 | 4298 | Bexpression* bvar_addr = |
4299 | gogo->backend()->address_expression(bvar_expr, loc); | |
ea664253 | 4300 | return gogo->backend()->compound_expression(bassign, bvar_addr, loc); |
e9d3367e | 4301 | } |
4302 | } | |
4303 | ||
f9ca30f9 | 4304 | Bexpression* ret; |
ea664253 | 4305 | Bexpression* bexpr = this->expr_->get_backend(context); |
f9ca30f9 | 4306 | Btype* btype = this->expr_->type()->get_backend(gogo); |
e440a328 | 4307 | switch (this->op_) |
4308 | { | |
4309 | case OPERATOR_PLUS: | |
f9ca30f9 | 4310 | ret = bexpr; |
4311 | break; | |
e440a328 | 4312 | |
4313 | case OPERATOR_MINUS: | |
f9ca30f9 | 4314 | ret = gogo->backend()->unary_expression(this->op_, bexpr, loc); |
4315 | ret = gogo->backend()->convert_expression(btype, ret, loc); | |
4316 | break; | |
e440a328 | 4317 | |
4318 | case OPERATOR_NOT: | |
e440a328 | 4319 | case OPERATOR_XOR: |
f9ca30f9 | 4320 | ret = gogo->backend()->unary_expression(this->op_, bexpr, loc); |
4321 | break; | |
e440a328 | 4322 | |
4323 | case OPERATOR_AND: | |
09ea332d | 4324 | if (!this->create_temp_) |
4325 | { | |
4326 | // We should not see a non-constant constructor here; cases | |
4327 | // where we would see one should have been moved onto the | |
4328 | // heap at parse time. Taking the address of a nonconstant | |
4329 | // constructor will not do what the programmer expects. | |
f9ca30f9 | 4330 | |
4331 | go_assert(!this->expr_->is_composite_literal() | |
3ae06f68 | 4332 | || this->expr_->is_static_initializer()); |
24060bf9 | 4333 | if (this->expr_->classification() == EXPRESSION_UNARY) |
4334 | { | |
4335 | Unary_expression* ue = | |
4336 | static_cast<Unary_expression*>(this->expr_); | |
4337 | go_assert(ue->op() != OPERATOR_AND); | |
4338 | } | |
09ea332d | 4339 | } |
e440a328 | 4340 | |
f23d7786 | 4341 | if (this->is_gc_root_ || this->is_slice_init_) |
76f85fd6 | 4342 | { |
19272321 | 4343 | std::string var_name; |
f23d7786 | 4344 | bool copy_to_heap = false; |
4345 | if (this->is_gc_root_) | |
4346 | { | |
4347 | // Build a decl for a GC root variable. GC roots are mutable, so | |
4348 | // they cannot be represented as an immutable_struct in the | |
4349 | // backend. | |
19272321 | 4350 | var_name = gogo->gc_root_name(); |
f23d7786 | 4351 | } |
4352 | else | |
4353 | { | |
4354 | // Build a decl for a slice value initializer. An immutable slice | |
4355 | // value initializer may have to be copied to the heap if it | |
4356 | // contains pointers in a non-constant context. | |
19272321 | 4357 | var_name = gogo->initializer_name(); |
f23d7786 | 4358 | |
4359 | Array_type* at = this->expr_->type()->array_type(); | |
4360 | go_assert(at != NULL); | |
4361 | ||
4362 | // If we are not copying the value to the heap, we will only | |
4363 | // initialize the value once, so we can use this directly | |
4364 | // rather than copying it. In that case we can't make it | |
4365 | // read-only, because the program is permitted to change it. | |
3ae06f68 | 4366 | copy_to_heap = context->function() != NULL; |
f23d7786 | 4367 | } |
19272321 | 4368 | std::string asm_name(go_selectively_encode_id(var_name)); |
f23d7786 | 4369 | Bvariable* implicit = |
19272321 | 4370 | gogo->backend()->implicit_variable(var_name, asm_name, |
438b4bec | 4371 | btype, true, copy_to_heap, |
4372 | false, 0); | |
19272321 | 4373 | gogo->backend()->implicit_variable_set_init(implicit, var_name, btype, |
aa5ae575 | 4374 | true, copy_to_heap, false, |
4375 | bexpr); | |
cfedf94d | 4376 | bexpr = gogo->backend()->var_expression(implicit, VE_rvalue, loc); |
1b4fb1e0 | 4377 | |
4378 | // If we are not copying a slice initializer to the heap, | |
4379 | // then it can be changed by the program, so if it can | |
4380 | // contain pointers we must register it as a GC root. | |
4381 | if (this->is_slice_init_ | |
4382 | && !copy_to_heap | |
4383 | && this->expr_->type()->has_pointer()) | |
4384 | { | |
4385 | Bexpression* root = | |
cfedf94d | 4386 | gogo->backend()->var_expression(implicit, VE_rvalue, loc); |
1b4fb1e0 | 4387 | root = gogo->backend()->address_expression(root, loc); |
4388 | Type* type = Type::make_pointer_type(this->expr_->type()); | |
4389 | gogo->add_gc_root(Expression::make_backend(root, type, loc)); | |
4390 | } | |
76f85fd6 | 4391 | } |
4392 | else if ((this->expr_->is_composite_literal() | |
3ae06f68 | 4393 | || this->expr_->string_expression() != NULL) |
4394 | && this->expr_->is_static_initializer()) | |
f9ca30f9 | 4395 | { |
19272321 | 4396 | std::string var_name(gogo->initializer_name()); |
4397 | std::string asm_name(go_selectively_encode_id(var_name)); | |
f9ca30f9 | 4398 | Bvariable* decl = |
19272321 | 4399 | gogo->backend()->immutable_struct(var_name, asm_name, |
438b4bec | 4400 | true, false, btype, loc); |
19272321 | 4401 | gogo->backend()->immutable_struct_set_init(decl, var_name, true, |
4402 | false, btype, loc, bexpr); | |
cfedf94d | 4403 | bexpr = gogo->backend()->var_expression(decl, VE_rvalue, loc); |
f9ca30f9 | 4404 | } |
09ea332d | 4405 | |
f9ca30f9 | 4406 | go_assert(!this->create_temp_ || this->expr_->is_variable()); |
4407 | ret = gogo->backend()->address_expression(bexpr, loc); | |
4408 | break; | |
e440a328 | 4409 | |
4410 | case OPERATOR_MULT: | |
4411 | { | |
f9ca30f9 | 4412 | go_assert(this->expr_->type()->points_to() != NULL); |
e440a328 | 4413 | |
4414 | // If we are dereferencing the pointer to a large struct, we | |
4415 | // need to check for nil. We don't bother to check for small | |
4416 | // structs because we expect the system to crash on a nil | |
56080003 | 4417 | // pointer dereference. However, if we know the address of this |
4418 | // expression is being taken, we must always check for nil. | |
f9ca30f9 | 4419 | |
4420 | Type* ptype = this->expr_->type()->points_to(); | |
4421 | Btype* pbtype = ptype->get_backend(gogo); | |
4422 | if (!ptype->is_void_type()) | |
e440a328 | 4423 | { |
2a305b85 | 4424 | int64_t s; |
4425 | bool ok = ptype->backend_type_size(gogo, &s); | |
4426 | if (!ok) | |
4427 | { | |
4428 | go_assert(saw_errors()); | |
4429 | return gogo->backend()->error_expression(); | |
4430 | } | |
f9ca30f9 | 4431 | if (s >= 4096 || this->issue_nil_check_) |
19b4f09b | 4432 | { |
f9ca30f9 | 4433 | go_assert(this->expr_->is_variable()); |
ea664253 | 4434 | Bexpression* nil = |
4435 | Expression::make_nil(loc)->get_backend(context); | |
f9ca30f9 | 4436 | Bexpression* compare = |
4437 | gogo->backend()->binary_expression(OPERATOR_EQEQ, bexpr, | |
4438 | nil, loc); | |
f9ca30f9 | 4439 | Bexpression* crash = |
ea664253 | 4440 | gogo->runtime_error(RUNTIME_ERROR_NIL_DEREFERENCE, |
4441 | loc)->get_backend(context); | |
93715b75 | 4442 | Bfunction* bfn = context->function()->func_value()->get_decl(); |
4443 | bexpr = gogo->backend()->conditional_expression(bfn, btype, | |
4444 | compare, | |
f9ca30f9 | 4445 | crash, bexpr, |
4446 | loc); | |
4447 | ||
19b4f09b | 4448 | } |
e440a328 | 4449 | } |
9b27b43c | 4450 | ret = gogo->backend()->indirect_expression(pbtype, bexpr, false, loc); |
e440a328 | 4451 | } |
f9ca30f9 | 4452 | break; |
e440a328 | 4453 | |
4454 | default: | |
c3e6f413 | 4455 | go_unreachable(); |
e440a328 | 4456 | } |
f9ca30f9 | 4457 | |
ea664253 | 4458 | return ret; |
e440a328 | 4459 | } |
4460 | ||
4461 | // Export a unary expression. | |
4462 | ||
4463 | void | |
4464 | Unary_expression::do_export(Export* exp) const | |
4465 | { | |
4466 | switch (this->op_) | |
4467 | { | |
4468 | case OPERATOR_PLUS: | |
4469 | exp->write_c_string("+ "); | |
4470 | break; | |
4471 | case OPERATOR_MINUS: | |
4472 | exp->write_c_string("- "); | |
4473 | break; | |
4474 | case OPERATOR_NOT: | |
4475 | exp->write_c_string("! "); | |
4476 | break; | |
4477 | case OPERATOR_XOR: | |
4478 | exp->write_c_string("^ "); | |
4479 | break; | |
4480 | case OPERATOR_AND: | |
4481 | case OPERATOR_MULT: | |
4482 | default: | |
c3e6f413 | 4483 | go_unreachable(); |
e440a328 | 4484 | } |
4485 | this->expr_->export_expression(exp); | |
4486 | } | |
4487 | ||
4488 | // Import a unary expression. | |
4489 | ||
4490 | Expression* | |
4491 | Unary_expression::do_import(Import* imp) | |
4492 | { | |
4493 | Operator op; | |
4494 | switch (imp->get_char()) | |
4495 | { | |
4496 | case '+': | |
4497 | op = OPERATOR_PLUS; | |
4498 | break; | |
4499 | case '-': | |
4500 | op = OPERATOR_MINUS; | |
4501 | break; | |
4502 | case '!': | |
4503 | op = OPERATOR_NOT; | |
4504 | break; | |
4505 | case '^': | |
4506 | op = OPERATOR_XOR; | |
4507 | break; | |
4508 | default: | |
c3e6f413 | 4509 | go_unreachable(); |
e440a328 | 4510 | } |
4511 | imp->require_c_string(" "); | |
4512 | Expression* expr = Expression::import_expression(imp); | |
4513 | return Expression::make_unary(op, expr, imp->location()); | |
4514 | } | |
4515 | ||
d751bb78 | 4516 | // Dump ast representation of an unary expression. |
4517 | ||
4518 | void | |
4519 | Unary_expression::do_dump_expression(Ast_dump_context* ast_dump_context) const | |
4520 | { | |
4521 | ast_dump_context->dump_operator(this->op_); | |
4522 | ast_dump_context->ostream() << "("; | |
4523 | ast_dump_context->dump_expression(this->expr_); | |
4524 | ast_dump_context->ostream() << ") "; | |
4525 | } | |
4526 | ||
e440a328 | 4527 | // Make a unary expression. |
4528 | ||
4529 | Expression* | |
b13c66cd | 4530 | Expression::make_unary(Operator op, Expression* expr, Location location) |
e440a328 | 4531 | { |
4532 | return new Unary_expression(op, expr, location); | |
4533 | } | |
4534 | ||
4535 | // If this is an indirection through a pointer, return the expression | |
4536 | // being pointed through. Otherwise return this. | |
4537 | ||
4538 | Expression* | |
4539 | Expression::deref() | |
4540 | { | |
4541 | if (this->classification_ == EXPRESSION_UNARY) | |
4542 | { | |
4543 | Unary_expression* ue = static_cast<Unary_expression*>(this); | |
4544 | if (ue->op() == OPERATOR_MULT) | |
4545 | return ue->operand(); | |
4546 | } | |
4547 | return this; | |
4548 | } | |
4549 | ||
4550 | // Class Binary_expression. | |
4551 | ||
4552 | // Traversal. | |
4553 | ||
4554 | int | |
4555 | Binary_expression::do_traverse(Traverse* traverse) | |
4556 | { | |
4557 | int t = Expression::traverse(&this->left_, traverse); | |
4558 | if (t == TRAVERSE_EXIT) | |
4559 | return TRAVERSE_EXIT; | |
4560 | return Expression::traverse(&this->right_, traverse); | |
4561 | } | |
4562 | ||
3ae06f68 | 4563 | // Return whether this expression may be used as a static initializer. |
4564 | ||
4565 | bool | |
4566 | Binary_expression::do_is_static_initializer() const | |
4567 | { | |
4568 | if (!this->left_->is_static_initializer() | |
4569 | || !this->right_->is_static_initializer()) | |
4570 | return false; | |
4571 | ||
4572 | // Addresses can be static initializers, but we can't implement | |
4573 | // arbitray binary expressions of them. | |
4574 | Unary_expression* lu = this->left_->unary_expression(); | |
4575 | Unary_expression* ru = this->right_->unary_expression(); | |
4576 | if (lu != NULL && lu->op() == OPERATOR_AND) | |
4577 | { | |
4578 | if (ru != NULL && ru->op() == OPERATOR_AND) | |
4579 | return this->op_ == OPERATOR_MINUS; | |
4580 | else | |
4581 | return this->op_ == OPERATOR_PLUS || this->op_ == OPERATOR_MINUS; | |
4582 | } | |
4583 | else if (ru != NULL && ru->op() == OPERATOR_AND) | |
4584 | return this->op_ == OPERATOR_PLUS || this->op_ == OPERATOR_MINUS; | |
4585 | ||
4586 | // Other cases should resolve in the backend. | |
4587 | return true; | |
4588 | } | |
4589 | ||
0c77715b | 4590 | // Return the type to use for a binary operation on operands of |
4591 | // LEFT_TYPE and RIGHT_TYPE. These are the types of constants and as | |
4592 | // such may be NULL or abstract. | |
4593 | ||
4594 | bool | |
4595 | Binary_expression::operation_type(Operator op, Type* left_type, | |
4596 | Type* right_type, Type** result_type) | |
4597 | { | |
4598 | if (left_type != right_type | |
4599 | && !left_type->is_abstract() | |
4600 | && !right_type->is_abstract() | |
4601 | && left_type->base() != right_type->base() | |
4602 | && op != OPERATOR_LSHIFT | |
4603 | && op != OPERATOR_RSHIFT) | |
4604 | { | |
4605 | // May be a type error--let it be diagnosed elsewhere. | |
4606 | return false; | |
4607 | } | |
4608 | ||
4609 | if (op == OPERATOR_LSHIFT || op == OPERATOR_RSHIFT) | |
4610 | { | |
4611 | if (left_type->integer_type() != NULL) | |
4612 | *result_type = left_type; | |
4613 | else | |
4614 | *result_type = Type::make_abstract_integer_type(); | |
4615 | } | |
4616 | else if (!left_type->is_abstract() && left_type->named_type() != NULL) | |
4617 | *result_type = left_type; | |
4618 | else if (!right_type->is_abstract() && right_type->named_type() != NULL) | |
4619 | *result_type = right_type; | |
4620 | else if (!left_type->is_abstract()) | |
4621 | *result_type = left_type; | |
4622 | else if (!right_type->is_abstract()) | |
4623 | *result_type = right_type; | |
4624 | else if (left_type->complex_type() != NULL) | |
4625 | *result_type = left_type; | |
4626 | else if (right_type->complex_type() != NULL) | |
4627 | *result_type = right_type; | |
4628 | else if (left_type->float_type() != NULL) | |
4629 | *result_type = left_type; | |
4630 | else if (right_type->float_type() != NULL) | |
4631 | *result_type = right_type; | |
4632 | else if (left_type->integer_type() != NULL | |
4633 | && left_type->integer_type()->is_rune()) | |
4634 | *result_type = left_type; | |
4635 | else if (right_type->integer_type() != NULL | |
4636 | && right_type->integer_type()->is_rune()) | |
4637 | *result_type = right_type; | |
4638 | else | |
4639 | *result_type = left_type; | |
4640 | ||
4641 | return true; | |
4642 | } | |
4643 | ||
4644 | // Convert an integer comparison code and an operator to a boolean | |
4645 | // value. | |
e440a328 | 4646 | |
4647 | bool | |
0c77715b | 4648 | Binary_expression::cmp_to_bool(Operator op, int cmp) |
e440a328 | 4649 | { |
e440a328 | 4650 | switch (op) |
4651 | { | |
4652 | case OPERATOR_EQEQ: | |
0c77715b | 4653 | return cmp == 0; |
4654 | break; | |
e440a328 | 4655 | case OPERATOR_NOTEQ: |
0c77715b | 4656 | return cmp != 0; |
4657 | break; | |
e440a328 | 4658 | case OPERATOR_LT: |
0c77715b | 4659 | return cmp < 0; |
4660 | break; | |
e440a328 | 4661 | case OPERATOR_LE: |
0c77715b | 4662 | return cmp <= 0; |
e440a328 | 4663 | case OPERATOR_GT: |
0c77715b | 4664 | return cmp > 0; |
e440a328 | 4665 | case OPERATOR_GE: |
0c77715b | 4666 | return cmp >= 0; |
e440a328 | 4667 | default: |
c3e6f413 | 4668 | go_unreachable(); |
e440a328 | 4669 | } |
4670 | } | |
4671 | ||
0c77715b | 4672 | // Compare constants according to OP. |
e440a328 | 4673 | |
4674 | bool | |
0c77715b | 4675 | Binary_expression::compare_constant(Operator op, Numeric_constant* left_nc, |
4676 | Numeric_constant* right_nc, | |
4677 | Location location, bool* result) | |
e440a328 | 4678 | { |
0c77715b | 4679 | Type* left_type = left_nc->type(); |
4680 | Type* right_type = right_nc->type(); | |
4681 | ||
4682 | Type* type; | |
4683 | if (!Binary_expression::operation_type(op, left_type, right_type, &type)) | |
4684 | return false; | |
4685 | ||
4686 | // When comparing an untyped operand to a typed operand, we are | |
4687 | // effectively coercing the untyped operand to the other operand's | |
4688 | // type, so make sure that is valid. | |
4689 | if (!left_nc->set_type(type, true, location) | |
4690 | || !right_nc->set_type(type, true, location)) | |
4691 | return false; | |
4692 | ||
4693 | bool ret; | |
4694 | int cmp; | |
4695 | if (type->complex_type() != NULL) | |
4696 | { | |
4697 | if (op != OPERATOR_EQEQ && op != OPERATOR_NOTEQ) | |
4698 | return false; | |
4699 | ret = Binary_expression::compare_complex(left_nc, right_nc, &cmp); | |
4700 | } | |
4701 | else if (type->float_type() != NULL) | |
4702 | ret = Binary_expression::compare_float(left_nc, right_nc, &cmp); | |
e440a328 | 4703 | else |
0c77715b | 4704 | ret = Binary_expression::compare_integer(left_nc, right_nc, &cmp); |
4705 | ||
4706 | if (ret) | |
4707 | *result = Binary_expression::cmp_to_bool(op, cmp); | |
4708 | ||
4709 | return ret; | |
4710 | } | |
4711 | ||
4712 | // Compare integer constants. | |
4713 | ||
4714 | bool | |
4715 | Binary_expression::compare_integer(const Numeric_constant* left_nc, | |
4716 | const Numeric_constant* right_nc, | |
4717 | int* cmp) | |
4718 | { | |
4719 | mpz_t left_val; | |
4720 | if (!left_nc->to_int(&left_val)) | |
4721 | return false; | |
4722 | mpz_t right_val; | |
4723 | if (!right_nc->to_int(&right_val)) | |
e440a328 | 4724 | { |
0c77715b | 4725 | mpz_clear(left_val); |
4726 | return false; | |
e440a328 | 4727 | } |
0c77715b | 4728 | |
4729 | *cmp = mpz_cmp(left_val, right_val); | |
4730 | ||
4731 | mpz_clear(left_val); | |
4732 | mpz_clear(right_val); | |
4733 | ||
4734 | return true; | |
4735 | } | |
4736 | ||
4737 | // Compare floating point constants. | |
4738 | ||
4739 | bool | |
4740 | Binary_expression::compare_float(const Numeric_constant* left_nc, | |
4741 | const Numeric_constant* right_nc, | |
4742 | int* cmp) | |
4743 | { | |
4744 | mpfr_t left_val; | |
4745 | if (!left_nc->to_float(&left_val)) | |
4746 | return false; | |
4747 | mpfr_t right_val; | |
4748 | if (!right_nc->to_float(&right_val)) | |
e440a328 | 4749 | { |
0c77715b | 4750 | mpfr_clear(left_val); |
4751 | return false; | |
4752 | } | |
4753 | ||
4754 | // We already coerced both operands to the same type. If that type | |
4755 | // is not an abstract type, we need to round the values accordingly. | |
4756 | Type* type = left_nc->type(); | |
4757 | if (!type->is_abstract() && type->float_type() != NULL) | |
4758 | { | |
4759 | int bits = type->float_type()->bits(); | |
4760 | mpfr_prec_round(left_val, bits, GMP_RNDN); | |
4761 | mpfr_prec_round(right_val, bits, GMP_RNDN); | |
e440a328 | 4762 | } |
0c77715b | 4763 | |
4764 | *cmp = mpfr_cmp(left_val, right_val); | |
4765 | ||
4766 | mpfr_clear(left_val); | |
4767 | mpfr_clear(right_val); | |
4768 | ||
4769 | return true; | |
e440a328 | 4770 | } |
4771 | ||
0c77715b | 4772 | // Compare complex constants. Complex numbers may only be compared |
4773 | // for equality. | |
e440a328 | 4774 | |
4775 | bool | |
0c77715b | 4776 | Binary_expression::compare_complex(const Numeric_constant* left_nc, |
4777 | const Numeric_constant* right_nc, | |
4778 | int* cmp) | |
e440a328 | 4779 | { |
fcbea5e4 | 4780 | mpc_t left_val; |
4781 | if (!left_nc->to_complex(&left_val)) | |
0c77715b | 4782 | return false; |
fcbea5e4 | 4783 | mpc_t right_val; |
4784 | if (!right_nc->to_complex(&right_val)) | |
e440a328 | 4785 | { |
fcbea5e4 | 4786 | mpc_clear(left_val); |
0c77715b | 4787 | return false; |
e440a328 | 4788 | } |
0c77715b | 4789 | |
4790 | // We already coerced both operands to the same type. If that type | |
4791 | // is not an abstract type, we need to round the values accordingly. | |
4792 | Type* type = left_nc->type(); | |
4793 | if (!type->is_abstract() && type->complex_type() != NULL) | |
e440a328 | 4794 | { |
0c77715b | 4795 | int bits = type->complex_type()->bits(); |
fcbea5e4 | 4796 | mpfr_prec_round(mpc_realref(left_val), bits / 2, GMP_RNDN); |
4797 | mpfr_prec_round(mpc_imagref(left_val), bits / 2, GMP_RNDN); | |
4798 | mpfr_prec_round(mpc_realref(right_val), bits / 2, GMP_RNDN); | |
4799 | mpfr_prec_round(mpc_imagref(right_val), bits / 2, GMP_RNDN); | |
e440a328 | 4800 | } |
0c77715b | 4801 | |
fcbea5e4 | 4802 | *cmp = mpc_cmp(left_val, right_val) != 0; |
0c77715b | 4803 | |
fcbea5e4 | 4804 | mpc_clear(left_val); |
4805 | mpc_clear(right_val); | |
0c77715b | 4806 | |
4807 | return true; | |
e440a328 | 4808 | } |
4809 | ||
0c77715b | 4810 | // Apply binary opcode OP to LEFT_NC and RIGHT_NC, setting NC. Return |
4811 | // true if this could be done, false if not. Issue errors at LOCATION | |
af7a5274 | 4812 | // as appropriate, and sets *ISSUED_ERROR if it did. |
e440a328 | 4813 | |
4814 | bool | |
0c77715b | 4815 | Binary_expression::eval_constant(Operator op, Numeric_constant* left_nc, |
4816 | Numeric_constant* right_nc, | |
af7a5274 | 4817 | Location location, Numeric_constant* nc, |
4818 | bool* issued_error) | |
e440a328 | 4819 | { |
af7a5274 | 4820 | *issued_error = false; |
e440a328 | 4821 | switch (op) |
4822 | { | |
4823 | case OPERATOR_OROR: | |
4824 | case OPERATOR_ANDAND: | |
4825 | case OPERATOR_EQEQ: | |
4826 | case OPERATOR_NOTEQ: | |
4827 | case OPERATOR_LT: | |
4828 | case OPERATOR_LE: | |
4829 | case OPERATOR_GT: | |
4830 | case OPERATOR_GE: | |
9767e2d3 | 4831 | // These return boolean values, not numeric. |
4832 | return false; | |
0c77715b | 4833 | default: |
4834 | break; | |
4835 | } | |
4836 | ||
4837 | Type* left_type = left_nc->type(); | |
4838 | Type* right_type = right_nc->type(); | |
4839 | ||
4840 | Type* type; | |
4841 | if (!Binary_expression::operation_type(op, left_type, right_type, &type)) | |
4842 | return false; | |
4843 | ||
4844 | bool is_shift = op == OPERATOR_LSHIFT || op == OPERATOR_RSHIFT; | |
4845 | ||
4846 | // When combining an untyped operand with a typed operand, we are | |
4847 | // effectively coercing the untyped operand to the other operand's | |
4848 | // type, so make sure that is valid. | |
4849 | if (!left_nc->set_type(type, true, location)) | |
4850 | return false; | |
4851 | if (!is_shift && !right_nc->set_type(type, true, location)) | |
4852 | return false; | |
85334a21 | 4853 | if (is_shift |
4854 | && ((left_type->integer_type() == NULL | |
4855 | && !left_type->is_abstract()) | |
4856 | || (right_type->integer_type() == NULL | |
4857 | && !right_type->is_abstract()))) | |
4858 | return false; | |
0c77715b | 4859 | |
4860 | bool r; | |
4861 | if (type->complex_type() != NULL) | |
4862 | r = Binary_expression::eval_complex(op, left_nc, right_nc, location, nc); | |
4863 | else if (type->float_type() != NULL) | |
4864 | r = Binary_expression::eval_float(op, left_nc, right_nc, location, nc); | |
4865 | else | |
4866 | r = Binary_expression::eval_integer(op, left_nc, right_nc, location, nc); | |
4867 | ||
4868 | if (r) | |
af7a5274 | 4869 | { |
4870 | r = nc->set_type(type, true, location); | |
4871 | if (!r) | |
4872 | *issued_error = true; | |
4873 | } | |
0c77715b | 4874 | |
4875 | return r; | |
4876 | } | |
4877 | ||
4878 | // Apply binary opcode OP to LEFT_NC and RIGHT_NC, setting NC, using | |
4879 | // integer operations. Return true if this could be done, false if | |
4880 | // not. | |
4881 | ||
4882 | bool | |
4883 | Binary_expression::eval_integer(Operator op, const Numeric_constant* left_nc, | |
4884 | const Numeric_constant* right_nc, | |
4885 | Location location, Numeric_constant* nc) | |
4886 | { | |
4887 | mpz_t left_val; | |
4888 | if (!left_nc->to_int(&left_val)) | |
4889 | return false; | |
4890 | mpz_t right_val; | |
4891 | if (!right_nc->to_int(&right_val)) | |
4892 | { | |
4893 | mpz_clear(left_val); | |
e440a328 | 4894 | return false; |
0c77715b | 4895 | } |
4896 | ||
4897 | mpz_t val; | |
4898 | mpz_init(val); | |
4899 | ||
4900 | switch (op) | |
4901 | { | |
e440a328 | 4902 | case OPERATOR_PLUS: |
4903 | mpz_add(val, left_val, right_val); | |
2c809f8f | 4904 | if (mpz_sizeinbase(val, 2) > 0x100000) |
4905 | { | |
631d5788 | 4906 | go_error_at(location, "constant addition overflow"); |
71a45216 | 4907 | nc->set_invalid(); |
2c809f8f | 4908 | mpz_set_ui(val, 1); |
4909 | } | |
e440a328 | 4910 | break; |
4911 | case OPERATOR_MINUS: | |
4912 | mpz_sub(val, left_val, right_val); | |
2c809f8f | 4913 | if (mpz_sizeinbase(val, 2) > 0x100000) |
4914 | { | |
631d5788 | 4915 | go_error_at(location, "constant subtraction overflow"); |
71a45216 | 4916 | nc->set_invalid(); |
2c809f8f | 4917 | mpz_set_ui(val, 1); |
4918 | } | |
e440a328 | 4919 | break; |
4920 | case OPERATOR_OR: | |
4921 | mpz_ior(val, left_val, right_val); | |
4922 | break; | |
4923 | case OPERATOR_XOR: | |
4924 | mpz_xor(val, left_val, right_val); | |
4925 | break; | |
4926 | case OPERATOR_MULT: | |
4927 | mpz_mul(val, left_val, right_val); | |
2c809f8f | 4928 | if (mpz_sizeinbase(val, 2) > 0x100000) |
4929 | { | |
631d5788 | 4930 | go_error_at(location, "constant multiplication overflow"); |
71a45216 | 4931 | nc->set_invalid(); |
2c809f8f | 4932 | mpz_set_ui(val, 1); |
4933 | } | |
e440a328 | 4934 | break; |
4935 | case OPERATOR_DIV: | |
4936 | if (mpz_sgn(right_val) != 0) | |
4937 | mpz_tdiv_q(val, left_val, right_val); | |
4938 | else | |
4939 | { | |
631d5788 | 4940 | go_error_at(location, "division by zero"); |
71a45216 | 4941 | nc->set_invalid(); |
e440a328 | 4942 | mpz_set_ui(val, 0); |
e440a328 | 4943 | } |
4944 | break; | |
4945 | case OPERATOR_MOD: | |
4946 | if (mpz_sgn(right_val) != 0) | |
4947 | mpz_tdiv_r(val, left_val, right_val); | |
4948 | else | |
4949 | { | |
631d5788 | 4950 | go_error_at(location, "division by zero"); |
71a45216 | 4951 | nc->set_invalid(); |
e440a328 | 4952 | mpz_set_ui(val, 0); |
e440a328 | 4953 | } |
4954 | break; | |
4955 | case OPERATOR_LSHIFT: | |
4956 | { | |
4957 | unsigned long shift = mpz_get_ui(right_val); | |
0c77715b | 4958 | if (mpz_cmp_ui(right_val, shift) == 0 && shift <= 0x100000) |
4959 | mpz_mul_2exp(val, left_val, shift); | |
4960 | else | |
e440a328 | 4961 | { |
631d5788 | 4962 | go_error_at(location, "shift count overflow"); |
71a45216 | 4963 | nc->set_invalid(); |
2c809f8f | 4964 | mpz_set_ui(val, 1); |
e440a328 | 4965 | } |
e440a328 | 4966 | break; |
4967 | } | |
4968 | break; | |
4969 | case OPERATOR_RSHIFT: | |
4970 | { | |
4971 | unsigned long shift = mpz_get_ui(right_val); | |
4972 | if (mpz_cmp_ui(right_val, shift) != 0) | |
4973 | { | |
631d5788 | 4974 | go_error_at(location, "shift count overflow"); |
71a45216 | 4975 | nc->set_invalid(); |
2c809f8f | 4976 | mpz_set_ui(val, 1); |
e440a328 | 4977 | } |
e440a328 | 4978 | else |
0c77715b | 4979 | { |
4980 | if (mpz_cmp_ui(left_val, 0) >= 0) | |
4981 | mpz_tdiv_q_2exp(val, left_val, shift); | |
4982 | else | |
4983 | mpz_fdiv_q_2exp(val, left_val, shift); | |
4984 | } | |
e440a328 | 4985 | break; |
4986 | } | |
4987 | break; | |
4988 | case OPERATOR_AND: | |
4989 | mpz_and(val, left_val, right_val); | |
4990 | break; | |
4991 | case OPERATOR_BITCLEAR: | |
4992 | { | |
4993 | mpz_t tval; | |
4994 | mpz_init(tval); | |
4995 | mpz_com(tval, right_val); | |
4996 | mpz_and(val, left_val, tval); | |
4997 | mpz_clear(tval); | |
4998 | } | |
4999 | break; | |
5000 | default: | |
c3e6f413 | 5001 | go_unreachable(); |
e440a328 | 5002 | } |
5003 | ||
0c77715b | 5004 | mpz_clear(left_val); |
5005 | mpz_clear(right_val); | |
e440a328 | 5006 | |
0c77715b | 5007 | if (left_nc->is_rune() |
5008 | || (op != OPERATOR_LSHIFT | |
5009 | && op != OPERATOR_RSHIFT | |
5010 | && right_nc->is_rune())) | |
5011 | nc->set_rune(NULL, val); | |
5012 | else | |
5013 | nc->set_int(NULL, val); | |
5014 | ||
5015 | mpz_clear(val); | |
e440a328 | 5016 | |
5017 | return true; | |
5018 | } | |
5019 | ||
0c77715b | 5020 | // Apply binary opcode OP to LEFT_NC and RIGHT_NC, setting NC, using |
5021 | // floating point operations. Return true if this could be done, | |
5022 | // false if not. | |
e440a328 | 5023 | |
5024 | bool | |
0c77715b | 5025 | Binary_expression::eval_float(Operator op, const Numeric_constant* left_nc, |
5026 | const Numeric_constant* right_nc, | |
5027 | Location location, Numeric_constant* nc) | |
e440a328 | 5028 | { |
0c77715b | 5029 | mpfr_t left_val; |
5030 | if (!left_nc->to_float(&left_val)) | |
5031 | return false; | |
5032 | mpfr_t right_val; | |
5033 | if (!right_nc->to_float(&right_val)) | |
e440a328 | 5034 | { |
0c77715b | 5035 | mpfr_clear(left_val); |
e440a328 | 5036 | return false; |
0c77715b | 5037 | } |
5038 | ||
5039 | mpfr_t val; | |
5040 | mpfr_init(val); | |
5041 | ||
5042 | bool ret = true; | |
5043 | switch (op) | |
5044 | { | |
e440a328 | 5045 | case OPERATOR_PLUS: |
5046 | mpfr_add(val, left_val, right_val, GMP_RNDN); | |
5047 | break; | |
5048 | case OPERATOR_MINUS: | |
5049 | mpfr_sub(val, left_val, right_val, GMP_RNDN); | |
5050 | break; | |
5051 | case OPERATOR_OR: | |
5052 | case OPERATOR_XOR: | |
5053 | case OPERATOR_AND: | |
5054 | case OPERATOR_BITCLEAR: | |
0c77715b | 5055 | case OPERATOR_MOD: |
5056 | case OPERATOR_LSHIFT: | |
5057 | case OPERATOR_RSHIFT: | |
5058 | mpfr_set_ui(val, 0, GMP_RNDN); | |
5059 | ret = false; | |
5060 | break; | |
e440a328 | 5061 | case OPERATOR_MULT: |
5062 | mpfr_mul(val, left_val, right_val, GMP_RNDN); | |
5063 | break; | |
5064 | case OPERATOR_DIV: | |
0c77715b | 5065 | if (!mpfr_zero_p(right_val)) |
5066 | mpfr_div(val, left_val, right_val, GMP_RNDN); | |
5067 | else | |
5068 | { | |
631d5788 | 5069 | go_error_at(location, "division by zero"); |
71a45216 | 5070 | nc->set_invalid(); |
0c77715b | 5071 | mpfr_set_ui(val, 0, GMP_RNDN); |
5072 | } | |
e440a328 | 5073 | break; |
e440a328 | 5074 | default: |
c3e6f413 | 5075 | go_unreachable(); |
e440a328 | 5076 | } |
5077 | ||
0c77715b | 5078 | mpfr_clear(left_val); |
5079 | mpfr_clear(right_val); | |
e440a328 | 5080 | |
0c77715b | 5081 | nc->set_float(NULL, val); |
5082 | mpfr_clear(val); | |
e440a328 | 5083 | |
0c77715b | 5084 | return ret; |
e440a328 | 5085 | } |
5086 | ||
0c77715b | 5087 | // Apply binary opcode OP to LEFT_NC and RIGHT_NC, setting NC, using |
5088 | // complex operations. Return true if this could be done, false if | |
5089 | // not. | |
e440a328 | 5090 | |
5091 | bool | |
0c77715b | 5092 | Binary_expression::eval_complex(Operator op, const Numeric_constant* left_nc, |
5093 | const Numeric_constant* right_nc, | |
5094 | Location location, Numeric_constant* nc) | |
e440a328 | 5095 | { |
fcbea5e4 | 5096 | mpc_t left_val; |
5097 | if (!left_nc->to_complex(&left_val)) | |
0c77715b | 5098 | return false; |
fcbea5e4 | 5099 | mpc_t right_val; |
5100 | if (!right_nc->to_complex(&right_val)) | |
e440a328 | 5101 | { |
fcbea5e4 | 5102 | mpc_clear(left_val); |
e440a328 | 5103 | return false; |
0c77715b | 5104 | } |
5105 | ||
fcbea5e4 | 5106 | mpc_t val; |
5107 | mpc_init2(val, mpc_precision); | |
0c77715b | 5108 | |
5109 | bool ret = true; | |
5110 | switch (op) | |
5111 | { | |
e440a328 | 5112 | case OPERATOR_PLUS: |
fcbea5e4 | 5113 | mpc_add(val, left_val, right_val, MPC_RNDNN); |
e440a328 | 5114 | break; |
5115 | case OPERATOR_MINUS: | |
fcbea5e4 | 5116 | mpc_sub(val, left_val, right_val, MPC_RNDNN); |
e440a328 | 5117 | break; |
5118 | case OPERATOR_OR: | |
5119 | case OPERATOR_XOR: | |
5120 | case OPERATOR_AND: | |
5121 | case OPERATOR_BITCLEAR: | |
0c77715b | 5122 | case OPERATOR_MOD: |
5123 | case OPERATOR_LSHIFT: | |
5124 | case OPERATOR_RSHIFT: | |
fcbea5e4 | 5125 | mpc_set_ui(val, 0, MPC_RNDNN); |
0c77715b | 5126 | ret = false; |
5127 | break; | |
e440a328 | 5128 | case OPERATOR_MULT: |
fcbea5e4 | 5129 | mpc_mul(val, left_val, right_val, MPC_RNDNN); |
e440a328 | 5130 | break; |
5131 | case OPERATOR_DIV: | |
fcbea5e4 | 5132 | if (mpc_cmp_si(right_val, 0) == 0) |
5133 | { | |
631d5788 | 5134 | go_error_at(location, "division by zero"); |
71a45216 | 5135 | nc->set_invalid(); |
fcbea5e4 | 5136 | mpc_set_ui(val, 0, MPC_RNDNN); |
5137 | break; | |
5138 | } | |
5139 | mpc_div(val, left_val, right_val, MPC_RNDNN); | |
e440a328 | 5140 | break; |
e440a328 | 5141 | default: |
c3e6f413 | 5142 | go_unreachable(); |
e440a328 | 5143 | } |
5144 | ||
fcbea5e4 | 5145 | mpc_clear(left_val); |
5146 | mpc_clear(right_val); | |
e440a328 | 5147 | |
fcbea5e4 | 5148 | nc->set_complex(NULL, val); |
5149 | mpc_clear(val); | |
e440a328 | 5150 | |
0c77715b | 5151 | return ret; |
e440a328 | 5152 | } |
5153 | ||
5154 | // Lower a binary expression. We have to evaluate constant | |
5155 | // expressions now, in order to implement Go's unlimited precision | |
5156 | // constants. | |
5157 | ||
5158 | Expression* | |
e9d3367e | 5159 | Binary_expression::do_lower(Gogo* gogo, Named_object*, |
5160 | Statement_inserter* inserter, int) | |
e440a328 | 5161 | { |
b13c66cd | 5162 | Location location = this->location(); |
e440a328 | 5163 | Operator op = this->op_; |
5164 | Expression* left = this->left_; | |
5165 | Expression* right = this->right_; | |
5166 | ||
5167 | const bool is_comparison = (op == OPERATOR_EQEQ | |
5168 | || op == OPERATOR_NOTEQ | |
5169 | || op == OPERATOR_LT | |
5170 | || op == OPERATOR_LE | |
5171 | || op == OPERATOR_GT | |
5172 | || op == OPERATOR_GE); | |
5173 | ||
0c77715b | 5174 | // Numeric constant expressions. |
e440a328 | 5175 | { |
0c77715b | 5176 | Numeric_constant left_nc; |
5177 | Numeric_constant right_nc; | |
5178 | if (left->numeric_constant_value(&left_nc) | |
5179 | && right->numeric_constant_value(&right_nc)) | |
e440a328 | 5180 | { |
0c77715b | 5181 | if (is_comparison) |
e440a328 | 5182 | { |
0c77715b | 5183 | bool result; |
5184 | if (!Binary_expression::compare_constant(op, &left_nc, | |
5185 | &right_nc, location, | |
5186 | &result)) | |
5187 | return this; | |
e90c9dfc | 5188 | return Expression::make_cast(Type::make_boolean_type(), |
0c77715b | 5189 | Expression::make_boolean(result, |
5190 | location), | |
5191 | location); | |
e440a328 | 5192 | } |
5193 | else | |
5194 | { | |
0c77715b | 5195 | Numeric_constant nc; |
af7a5274 | 5196 | bool issued_error; |
0c77715b | 5197 | if (!Binary_expression::eval_constant(op, &left_nc, &right_nc, |
af7a5274 | 5198 | location, &nc, |
5199 | &issued_error)) | |
5200 | { | |
5201 | if (issued_error) | |
5202 | return Expression::make_error(location); | |
71a45216 | 5203 | return this; |
af7a5274 | 5204 | } |
0c77715b | 5205 | return nc.expression(location); |
e440a328 | 5206 | } |
5207 | } | |
e440a328 | 5208 | } |
5209 | ||
5210 | // String constant expressions. | |
315fa98d | 5211 | if (left->type()->is_string_type() && right->type()->is_string_type()) |
e440a328 | 5212 | { |
5213 | std::string left_string; | |
5214 | std::string right_string; | |
5215 | if (left->string_constant_value(&left_string) | |
5216 | && right->string_constant_value(&right_string)) | |
315fa98d | 5217 | { |
5218 | if (op == OPERATOR_PLUS) | |
5219 | return Expression::make_string(left_string + right_string, | |
5220 | location); | |
5221 | else if (is_comparison) | |
5222 | { | |
5223 | int cmp = left_string.compare(right_string); | |
0c77715b | 5224 | bool r = Binary_expression::cmp_to_bool(op, cmp); |
e90c9dfc | 5225 | return Expression::make_boolean(r, location); |
b40dc774 | 5226 | } |
5227 | } | |
b40dc774 | 5228 | } |
5229 | ||
ceeb12d7 | 5230 | // Lower struct, array, and some interface comparisons. |
e9d3367e | 5231 | if (op == OPERATOR_EQEQ || op == OPERATOR_NOTEQ) |
5232 | { | |
b79832ca | 5233 | if (left->type()->struct_type() != NULL |
5234 | && right->type()->struct_type() != NULL) | |
e9d3367e | 5235 | return this->lower_struct_comparison(gogo, inserter); |
5236 | else if (left->type()->array_type() != NULL | |
b79832ca | 5237 | && !left->type()->is_slice_type() |
5238 | && right->type()->array_type() != NULL | |
5239 | && !right->type()->is_slice_type()) | |
e9d3367e | 5240 | return this->lower_array_comparison(gogo, inserter); |
ceeb12d7 | 5241 | else if ((left->type()->interface_type() != NULL |
5242 | && right->type()->interface_type() == NULL) | |
5243 | || (left->type()->interface_type() == NULL | |
5244 | && right->type()->interface_type() != NULL)) | |
5245 | return this->lower_interface_value_comparison(gogo, inserter); | |
e9d3367e | 5246 | } |
5247 | ||
736a16ba | 5248 | // Lower string concatenation to String_concat_expression, so that |
5249 | // we can group sequences of string additions. | |
5250 | if (this->left_->type()->is_string_type() && this->op_ == OPERATOR_PLUS) | |
5251 | { | |
5252 | Expression_list* exprs; | |
5253 | String_concat_expression* left_sce = | |
5254 | this->left_->string_concat_expression(); | |
5255 | if (left_sce != NULL) | |
5256 | exprs = left_sce->exprs(); | |
5257 | else | |
5258 | { | |
5259 | exprs = new Expression_list(); | |
5260 | exprs->push_back(this->left_); | |
5261 | } | |
5262 | ||
5263 | String_concat_expression* right_sce = | |
5264 | this->right_->string_concat_expression(); | |
5265 | if (right_sce != NULL) | |
5266 | exprs->append(right_sce->exprs()); | |
5267 | else | |
5268 | exprs->push_back(this->right_); | |
5269 | ||
5270 | return Expression::make_string_concat(exprs); | |
5271 | } | |
5272 | ||
e440a328 | 5273 | return this; |
5274 | } | |
5275 | ||
e9d3367e | 5276 | // Lower a struct comparison. |
5277 | ||
5278 | Expression* | |
5279 | Binary_expression::lower_struct_comparison(Gogo* gogo, | |
5280 | Statement_inserter* inserter) | |
5281 | { | |
5282 | Struct_type* st = this->left_->type()->struct_type(); | |
5283 | Struct_type* st2 = this->right_->type()->struct_type(); | |
5284 | if (st2 == NULL) | |
5285 | return this; | |
5286 | if (st != st2 && !Type::are_identical(st, st2, false, NULL)) | |
5287 | return this; | |
5288 | if (!Type::are_compatible_for_comparison(true, this->left_->type(), | |
5289 | this->right_->type(), NULL)) | |
5290 | return this; | |
5291 | ||
5292 | // See if we can compare using memcmp. As a heuristic, we use | |
5293 | // memcmp rather than field references and comparisons if there are | |
5294 | // more than two fields. | |
113ef6a5 | 5295 | if (st->compare_is_identity(gogo) && st->total_field_count() > 2) |
e9d3367e | 5296 | return this->lower_compare_to_memcmp(gogo, inserter); |
5297 | ||
5298 | Location loc = this->location(); | |
5299 | ||
5300 | Expression* left = this->left_; | |
5301 | Temporary_statement* left_temp = NULL; | |
5302 | if (left->var_expression() == NULL | |
5303 | && left->temporary_reference_expression() == NULL) | |
5304 | { | |
5305 | left_temp = Statement::make_temporary(left->type(), NULL, loc); | |
5306 | inserter->insert(left_temp); | |
5307 | left = Expression::make_set_and_use_temporary(left_temp, left, loc); | |
5308 | } | |
5309 | ||
5310 | Expression* right = this->right_; | |
5311 | Temporary_statement* right_temp = NULL; | |
5312 | if (right->var_expression() == NULL | |
5313 | && right->temporary_reference_expression() == NULL) | |
5314 | { | |
5315 | right_temp = Statement::make_temporary(right->type(), NULL, loc); | |
5316 | inserter->insert(right_temp); | |
5317 | right = Expression::make_set_and_use_temporary(right_temp, right, loc); | |
5318 | } | |
5319 | ||
5320 | Expression* ret = Expression::make_boolean(true, loc); | |
5321 | const Struct_field_list* fields = st->fields(); | |
5322 | unsigned int field_index = 0; | |
5323 | for (Struct_field_list::const_iterator pf = fields->begin(); | |
5324 | pf != fields->end(); | |
5325 | ++pf, ++field_index) | |
5326 | { | |
f5165c05 | 5327 | if (Gogo::is_sink_name(pf->field_name())) |
5328 | continue; | |
5329 | ||
e9d3367e | 5330 | if (field_index > 0) |
5331 | { | |
5332 | if (left_temp == NULL) | |
5333 | left = left->copy(); | |
5334 | else | |
5335 | left = Expression::make_temporary_reference(left_temp, loc); | |
5336 | if (right_temp == NULL) | |
5337 | right = right->copy(); | |
5338 | else | |
5339 | right = Expression::make_temporary_reference(right_temp, loc); | |
5340 | } | |
5341 | Expression* f1 = Expression::make_field_reference(left, field_index, | |
5342 | loc); | |
5343 | Expression* f2 = Expression::make_field_reference(right, field_index, | |
5344 | loc); | |
5345 | Expression* cond = Expression::make_binary(OPERATOR_EQEQ, f1, f2, loc); | |
5346 | ret = Expression::make_binary(OPERATOR_ANDAND, ret, cond, loc); | |
5347 | } | |
5348 | ||
5349 | if (this->op_ == OPERATOR_NOTEQ) | |
5350 | ret = Expression::make_unary(OPERATOR_NOT, ret, loc); | |
5351 | ||
5352 | return ret; | |
5353 | } | |
5354 | ||
5355 | // Lower an array comparison. | |
5356 | ||
5357 | Expression* | |
5358 | Binary_expression::lower_array_comparison(Gogo* gogo, | |
5359 | Statement_inserter* inserter) | |
5360 | { | |
5361 | Array_type* at = this->left_->type()->array_type(); | |
5362 | Array_type* at2 = this->right_->type()->array_type(); | |
5363 | if (at2 == NULL) | |
5364 | return this; | |
5365 | if (at != at2 && !Type::are_identical(at, at2, false, NULL)) | |
5366 | return this; | |
5367 | if (!Type::are_compatible_for_comparison(true, this->left_->type(), | |
5368 | this->right_->type(), NULL)) | |
5369 | return this; | |
5370 | ||
5371 | // Call memcmp directly if possible. This may let the middle-end | |
5372 | // optimize the call. | |
113ef6a5 | 5373 | if (at->compare_is_identity(gogo)) |
e9d3367e | 5374 | return this->lower_compare_to_memcmp(gogo, inserter); |
5375 | ||
5376 | // Call the array comparison function. | |
5377 | Named_object* hash_fn; | |
5378 | Named_object* equal_fn; | |
5379 | at->type_functions(gogo, this->left_->type()->named_type(), NULL, NULL, | |
5380 | &hash_fn, &equal_fn); | |
5381 | ||
5382 | Location loc = this->location(); | |
5383 | ||
5384 | Expression* func = Expression::make_func_reference(equal_fn, NULL, loc); | |
5385 | ||
5386 | Expression_list* args = new Expression_list(); | |
5387 | args->push_back(this->operand_address(inserter, this->left_)); | |
5388 | args->push_back(this->operand_address(inserter, this->right_)); | |
e9d3367e | 5389 | |
5390 | Expression* ret = Expression::make_call(func, args, false, loc); | |
5391 | ||
5392 | if (this->op_ == OPERATOR_NOTEQ) | |
5393 | ret = Expression::make_unary(OPERATOR_NOT, ret, loc); | |
5394 | ||
5395 | return ret; | |
5396 | } | |
5397 | ||
ceeb12d7 | 5398 | // Lower an interface to value comparison. |
5399 | ||
5400 | Expression* | |
5401 | Binary_expression::lower_interface_value_comparison(Gogo*, | |
5402 | Statement_inserter* inserter) | |
5403 | { | |
5404 | Type* left_type = this->left_->type(); | |
5405 | Type* right_type = this->right_->type(); | |
5406 | Interface_type* ift; | |
5407 | if (left_type->interface_type() != NULL) | |
5408 | { | |
5409 | ift = left_type->interface_type(); | |
5410 | if (!ift->implements_interface(right_type, NULL)) | |
5411 | return this; | |
5412 | } | |
5413 | else | |
5414 | { | |
5415 | ift = right_type->interface_type(); | |
5416 | if (!ift->implements_interface(left_type, NULL)) | |
5417 | return this; | |
5418 | } | |
5419 | if (!Type::are_compatible_for_comparison(true, left_type, right_type, NULL)) | |
5420 | return this; | |
5421 | ||
5422 | Location loc = this->location(); | |
5423 | ||
5424 | if (left_type->interface_type() == NULL | |
5425 | && left_type->points_to() == NULL | |
5426 | && !this->left_->is_addressable()) | |
5427 | { | |
5428 | Temporary_statement* temp = | |
5429 | Statement::make_temporary(left_type, NULL, loc); | |
5430 | inserter->insert(temp); | |
5431 | this->left_ = | |
5432 | Expression::make_set_and_use_temporary(temp, this->left_, loc); | |
5433 | } | |
5434 | ||
5435 | if (right_type->interface_type() == NULL | |
5436 | && right_type->points_to() == NULL | |
5437 | && !this->right_->is_addressable()) | |
5438 | { | |
5439 | Temporary_statement* temp = | |
5440 | Statement::make_temporary(right_type, NULL, loc); | |
5441 | inserter->insert(temp); | |
5442 | this->right_ = | |
5443 | Expression::make_set_and_use_temporary(temp, this->right_, loc); | |
5444 | } | |
5445 | ||
5446 | return this; | |
5447 | } | |
5448 | ||
e9d3367e | 5449 | // Lower a struct or array comparison to a call to memcmp. |
5450 | ||
5451 | Expression* | |
5452 | Binary_expression::lower_compare_to_memcmp(Gogo*, Statement_inserter* inserter) | |
5453 | { | |
5454 | Location loc = this->location(); | |
5455 | ||
5456 | Expression* a1 = this->operand_address(inserter, this->left_); | |
5457 | Expression* a2 = this->operand_address(inserter, this->right_); | |
5458 | Expression* len = Expression::make_type_info(this->left_->type(), | |
5459 | TYPE_INFO_SIZE); | |
5460 | ||
5461 | Expression* call = Runtime::make_call(Runtime::MEMCMP, loc, 3, a1, a2, len); | |
e67508fa | 5462 | Expression* zero = Expression::make_integer_ul(0, NULL, loc); |
e9d3367e | 5463 | return Expression::make_binary(this->op_, call, zero, loc); |
5464 | } | |
5465 | ||
a32698ee | 5466 | Expression* |
5c3f3470 | 5467 | Binary_expression::do_flatten(Gogo* gogo, Named_object*, |
a32698ee | 5468 | Statement_inserter* inserter) |
5469 | { | |
5470 | Location loc = this->location(); | |
5bf8be8b | 5471 | if (this->left_->type()->is_error_type() |
5472 | || this->right_->type()->is_error_type() | |
5473 | || this->left_->is_error_expression() | |
5474 | || this->right_->is_error_expression()) | |
5475 | { | |
5476 | go_assert(saw_errors()); | |
5477 | return Expression::make_error(loc); | |
5478 | } | |
5479 | ||
a32698ee | 5480 | Temporary_statement* temp; |
a32698ee | 5481 | |
5482 | Type* left_type = this->left_->type(); | |
5483 | bool is_shift_op = (this->op_ == OPERATOR_LSHIFT | |
5484 | || this->op_ == OPERATOR_RSHIFT); | |
5485 | bool is_idiv_op = ((this->op_ == OPERATOR_DIV && | |
5486 | left_type->integer_type() != NULL) | |
5487 | || this->op_ == OPERATOR_MOD); | |
5488 | ||
a32698ee | 5489 | if (is_shift_op |
5c3f3470 | 5490 | || (is_idiv_op |
5491 | && (gogo->check_divide_by_zero() || gogo->check_divide_overflow()))) | |
a32698ee | 5492 | { |
545ab43b | 5493 | if (!this->left_->is_variable() && !this->left_->is_constant()) |
a32698ee | 5494 | { |
5495 | temp = Statement::make_temporary(NULL, this->left_, loc); | |
5496 | inserter->insert(temp); | |
5497 | this->left_ = Expression::make_temporary_reference(temp, loc); | |
5498 | } | |
545ab43b | 5499 | if (!this->right_->is_variable() && !this->right_->is_constant()) |
a32698ee | 5500 | { |
5501 | temp = | |
5502 | Statement::make_temporary(NULL, this->right_, loc); | |
5503 | this->right_ = Expression::make_temporary_reference(temp, loc); | |
5504 | inserter->insert(temp); | |
5505 | } | |
5506 | } | |
5507 | return this; | |
5508 | } | |
5509 | ||
5510 | ||
e9d3367e | 5511 | // Return the address of EXPR, cast to unsafe.Pointer. |
5512 | ||
5513 | Expression* | |
5514 | Binary_expression::operand_address(Statement_inserter* inserter, | |
5515 | Expression* expr) | |
5516 | { | |
5517 | Location loc = this->location(); | |
5518 | ||
5519 | if (!expr->is_addressable()) | |
5520 | { | |
5521 | Temporary_statement* temp = Statement::make_temporary(expr->type(), NULL, | |
5522 | loc); | |
5523 | inserter->insert(temp); | |
5524 | expr = Expression::make_set_and_use_temporary(temp, expr, loc); | |
5525 | } | |
5526 | expr = Expression::make_unary(OPERATOR_AND, expr, loc); | |
5527 | static_cast<Unary_expression*>(expr)->set_does_not_escape(); | |
5528 | Type* void_type = Type::make_void_type(); | |
5529 | Type* unsafe_pointer_type = Type::make_pointer_type(void_type); | |
5530 | return Expression::make_cast(unsafe_pointer_type, expr, loc); | |
5531 | } | |
5532 | ||
0c77715b | 5533 | // Return the numeric constant value, if it has one. |
e440a328 | 5534 | |
5535 | bool | |
0c77715b | 5536 | Binary_expression::do_numeric_constant_value(Numeric_constant* nc) const |
e440a328 | 5537 | { |
0c77715b | 5538 | Numeric_constant left_nc; |
5539 | if (!this->left_->numeric_constant_value(&left_nc)) | |
5540 | return false; | |
5541 | Numeric_constant right_nc; | |
5542 | if (!this->right_->numeric_constant_value(&right_nc)) | |
5543 | return false; | |
af7a5274 | 5544 | bool issued_error; |
9767e2d3 | 5545 | return Binary_expression::eval_constant(this->op_, &left_nc, &right_nc, |
af7a5274 | 5546 | this->location(), nc, &issued_error); |
e440a328 | 5547 | } |
5548 | ||
5549 | // Note that the value is being discarded. | |
5550 | ||
4f2138d7 | 5551 | bool |
e440a328 | 5552 | Binary_expression::do_discarding_value() |
5553 | { | |
5554 | if (this->op_ == OPERATOR_OROR || this->op_ == OPERATOR_ANDAND) | |
4f2138d7 | 5555 | return this->right_->discarding_value(); |
e440a328 | 5556 | else |
4f2138d7 | 5557 | { |
5558 | this->unused_value_error(); | |
5559 | return false; | |
5560 | } | |
e440a328 | 5561 | } |
5562 | ||
5563 | // Get type. | |
5564 | ||
5565 | Type* | |
5566 | Binary_expression::do_type() | |
5567 | { | |
5f5fea79 | 5568 | if (this->classification() == EXPRESSION_ERROR) |
5569 | return Type::make_error_type(); | |
5570 | ||
e440a328 | 5571 | switch (this->op_) |
5572 | { | |
e440a328 | 5573 | case OPERATOR_EQEQ: |
5574 | case OPERATOR_NOTEQ: | |
5575 | case OPERATOR_LT: | |
5576 | case OPERATOR_LE: | |
5577 | case OPERATOR_GT: | |
5578 | case OPERATOR_GE: | |
e90c9dfc | 5579 | if (this->type_ == NULL) |
5580 | this->type_ = Type::make_boolean_type(); | |
5581 | return this->type_; | |
e440a328 | 5582 | |
5583 | case OPERATOR_PLUS: | |
5584 | case OPERATOR_MINUS: | |
5585 | case OPERATOR_OR: | |
5586 | case OPERATOR_XOR: | |
5587 | case OPERATOR_MULT: | |
5588 | case OPERATOR_DIV: | |
5589 | case OPERATOR_MOD: | |
5590 | case OPERATOR_AND: | |
5591 | case OPERATOR_BITCLEAR: | |
e90c9dfc | 5592 | case OPERATOR_OROR: |
5593 | case OPERATOR_ANDAND: | |
e440a328 | 5594 | { |
0c77715b | 5595 | Type* type; |
5596 | if (!Binary_expression::operation_type(this->op_, | |
5597 | this->left_->type(), | |
5598 | this->right_->type(), | |
5599 | &type)) | |
5600 | return Type::make_error_type(); | |
5601 | return type; | |
e440a328 | 5602 | } |
5603 | ||
5604 | case OPERATOR_LSHIFT: | |
5605 | case OPERATOR_RSHIFT: | |
5606 | return this->left_->type(); | |
5607 | ||
5608 | default: | |
c3e6f413 | 5609 | go_unreachable(); |
e440a328 | 5610 | } |
5611 | } | |
5612 | ||
5613 | // Set type for a binary expression. | |
5614 | ||
5615 | void | |
5616 | Binary_expression::do_determine_type(const Type_context* context) | |
5617 | { | |
5618 | Type* tleft = this->left_->type(); | |
5619 | Type* tright = this->right_->type(); | |
5620 | ||
5621 | // Both sides should have the same type, except for the shift | |
5622 | // operations. For a comparison, we should ignore the incoming | |
5623 | // type. | |
5624 | ||
5625 | bool is_shift_op = (this->op_ == OPERATOR_LSHIFT | |
5626 | || this->op_ == OPERATOR_RSHIFT); | |
5627 | ||
5628 | bool is_comparison = (this->op_ == OPERATOR_EQEQ | |
5629 | || this->op_ == OPERATOR_NOTEQ | |
5630 | || this->op_ == OPERATOR_LT | |
5631 | || this->op_ == OPERATOR_LE | |
5632 | || this->op_ == OPERATOR_GT | |
5633 | || this->op_ == OPERATOR_GE); | |
5634 | ||
c999c2a7 | 5635 | // For constant expressions, the context of the result is not useful in |
5636 | // determining the types of the operands. It is only legal to use abstract | |
5637 | // boolean, numeric, and string constants as operands where it is legal to | |
5638 | // use non-abstract boolean, numeric, and string constants, respectively. | |
5639 | // Any issues with the operation will be resolved in the check_types pass. | |
5640 | bool is_constant_expr = (this->left_->is_constant() | |
5641 | && this->right_->is_constant()); | |
5642 | ||
e440a328 | 5643 | Type_context subcontext(*context); |
5644 | ||
9c4ff2ce | 5645 | if (is_constant_expr && !is_shift_op) |
af7a5274 | 5646 | { |
5647 | subcontext.type = NULL; | |
5648 | subcontext.may_be_abstract = true; | |
5649 | } | |
5650 | else if (is_comparison) | |
e440a328 | 5651 | { |
5652 | // In a comparison, the context does not determine the types of | |
5653 | // the operands. | |
5654 | subcontext.type = NULL; | |
5655 | } | |
5656 | ||
5657 | // Set the context for the left hand operand. | |
5658 | if (is_shift_op) | |
5659 | { | |
b40dc774 | 5660 | // The right hand operand of a shift plays no role in |
5661 | // determining the type of the left hand operand. | |
e440a328 | 5662 | } |
5663 | else if (!tleft->is_abstract()) | |
5664 | subcontext.type = tleft; | |
5665 | else if (!tright->is_abstract()) | |
5666 | subcontext.type = tright; | |
5667 | else if (subcontext.type == NULL) | |
5668 | { | |
5669 | if ((tleft->integer_type() != NULL && tright->integer_type() != NULL) | |
5670 | || (tleft->float_type() != NULL && tright->float_type() != NULL) | |
5671 | || (tleft->complex_type() != NULL && tright->complex_type() != NULL)) | |
5672 | { | |
5673 | // Both sides have an abstract integer, abstract float, or | |
5674 | // abstract complex type. Just let CONTEXT determine | |
5675 | // whether they may remain abstract or not. | |
5676 | } | |
5677 | else if (tleft->complex_type() != NULL) | |
5678 | subcontext.type = tleft; | |
5679 | else if (tright->complex_type() != NULL) | |
5680 | subcontext.type = tright; | |
5681 | else if (tleft->float_type() != NULL) | |
5682 | subcontext.type = tleft; | |
5683 | else if (tright->float_type() != NULL) | |
5684 | subcontext.type = tright; | |
5685 | else | |
5686 | subcontext.type = tleft; | |
f58a23ae | 5687 | |
5688 | if (subcontext.type != NULL && !context->may_be_abstract) | |
5689 | subcontext.type = subcontext.type->make_non_abstract_type(); | |
e440a328 | 5690 | } |
5691 | ||
af7a5274 | 5692 | this->left_->determine_type(&subcontext); |
e440a328 | 5693 | |
e440a328 | 5694 | if (is_shift_op) |
5695 | { | |
b40dc774 | 5696 | // We may have inherited an unusable type for the shift operand. |
5697 | // Give a useful error if that happened. | |
5698 | if (tleft->is_abstract() | |
5699 | && subcontext.type != NULL | |
8ab6effb | 5700 | && !subcontext.may_be_abstract |
f6bc81e6 | 5701 | && subcontext.type->interface_type() == NULL |
8ab6effb | 5702 | && subcontext.type->integer_type() == NULL) |
b40dc774 | 5703 | this->report_error(("invalid context-determined non-integer type " |
8ab6effb | 5704 | "for left operand of shift")); |
b40dc774 | 5705 | |
5706 | // The context for the right hand operand is the same as for the | |
5707 | // left hand operand, except for a shift operator. | |
e440a328 | 5708 | subcontext.type = Type::lookup_integer_type("uint"); |
5709 | subcontext.may_be_abstract = false; | |
5710 | } | |
5711 | ||
af7a5274 | 5712 | this->right_->determine_type(&subcontext); |
e90c9dfc | 5713 | |
5714 | if (is_comparison) | |
5715 | { | |
5716 | if (this->type_ != NULL && !this->type_->is_abstract()) | |
5717 | ; | |
5718 | else if (context->type != NULL && context->type->is_boolean_type()) | |
5719 | this->type_ = context->type; | |
5720 | else if (!context->may_be_abstract) | |
5721 | this->type_ = Type::lookup_bool_type(); | |
5722 | } | |
e440a328 | 5723 | } |
5724 | ||
5725 | // Report an error if the binary operator OP does not support TYPE. | |
be8b5eee | 5726 | // OTYPE is the type of the other operand. Return whether the |
5727 | // operation is OK. This should not be used for shift. | |
e440a328 | 5728 | |
5729 | bool | |
be8b5eee | 5730 | Binary_expression::check_operator_type(Operator op, Type* type, Type* otype, |
b13c66cd | 5731 | Location location) |
e440a328 | 5732 | { |
5733 | switch (op) | |
5734 | { | |
5735 | case OPERATOR_OROR: | |
5736 | case OPERATOR_ANDAND: | |
c999c2a7 | 5737 | if (!type->is_boolean_type() |
5738 | || !otype->is_boolean_type()) | |
e440a328 | 5739 | { |
631d5788 | 5740 | go_error_at(location, "expected boolean type"); |
e440a328 | 5741 | return false; |
5742 | } | |
5743 | break; | |
5744 | ||
5745 | case OPERATOR_EQEQ: | |
5746 | case OPERATOR_NOTEQ: | |
e9d3367e | 5747 | { |
5748 | std::string reason; | |
5749 | if (!Type::are_compatible_for_comparison(true, type, otype, &reason)) | |
5750 | { | |
631d5788 | 5751 | go_error_at(location, "%s", reason.c_str()); |
e9d3367e | 5752 | return false; |
5753 | } | |
5754 | } | |
e440a328 | 5755 | break; |
5756 | ||
5757 | case OPERATOR_LT: | |
5758 | case OPERATOR_LE: | |
5759 | case OPERATOR_GT: | |
5760 | case OPERATOR_GE: | |
e9d3367e | 5761 | { |
5762 | std::string reason; | |
5763 | if (!Type::are_compatible_for_comparison(false, type, otype, &reason)) | |
5764 | { | |
631d5788 | 5765 | go_error_at(location, "%s", reason.c_str()); |
e9d3367e | 5766 | return false; |
5767 | } | |
5768 | } | |
e440a328 | 5769 | break; |
5770 | ||
5771 | case OPERATOR_PLUS: | |
5772 | case OPERATOR_PLUSEQ: | |
c999c2a7 | 5773 | if ((!type->is_numeric_type() && !type->is_string_type()) |
5774 | || (!otype->is_numeric_type() && !otype->is_string_type())) | |
e440a328 | 5775 | { |
631d5788 | 5776 | go_error_at(location, |
e440a328 | 5777 | "expected integer, floating, complex, or string type"); |
5778 | return false; | |
5779 | } | |
5780 | break; | |
5781 | ||
5782 | case OPERATOR_MINUS: | |
5783 | case OPERATOR_MINUSEQ: | |
5784 | case OPERATOR_MULT: | |
5785 | case OPERATOR_MULTEQ: | |
5786 | case OPERATOR_DIV: | |
5787 | case OPERATOR_DIVEQ: | |
c999c2a7 | 5788 | if (!type->is_numeric_type() || !otype->is_numeric_type()) |
e440a328 | 5789 | { |
631d5788 | 5790 | go_error_at(location, "expected integer, floating, or complex type"); |
e440a328 | 5791 | return false; |
5792 | } | |
5793 | break; | |
5794 | ||
5795 | case OPERATOR_MOD: | |
5796 | case OPERATOR_MODEQ: | |
5797 | case OPERATOR_OR: | |
5798 | case OPERATOR_OREQ: | |
5799 | case OPERATOR_AND: | |
5800 | case OPERATOR_ANDEQ: | |
5801 | case OPERATOR_XOR: | |
5802 | case OPERATOR_XOREQ: | |
5803 | case OPERATOR_BITCLEAR: | |
5804 | case OPERATOR_BITCLEAREQ: | |
c999c2a7 | 5805 | if (type->integer_type() == NULL || otype->integer_type() == NULL) |
e440a328 | 5806 | { |
631d5788 | 5807 | go_error_at(location, "expected integer type"); |
e440a328 | 5808 | return false; |
5809 | } | |
5810 | break; | |
5811 | ||
5812 | default: | |
c3e6f413 | 5813 | go_unreachable(); |
e440a328 | 5814 | } |
5815 | ||
5816 | return true; | |
5817 | } | |
5818 | ||
5819 | // Check types. | |
5820 | ||
5821 | void | |
5822 | Binary_expression::do_check_types(Gogo*) | |
5823 | { | |
5f5fea79 | 5824 | if (this->classification() == EXPRESSION_ERROR) |
5825 | return; | |
5826 | ||
e440a328 | 5827 | Type* left_type = this->left_->type(); |
5828 | Type* right_type = this->right_->type(); | |
5c13bd80 | 5829 | if (left_type->is_error() || right_type->is_error()) |
9fe897ef | 5830 | { |
5831 | this->set_is_error(); | |
5832 | return; | |
5833 | } | |
e440a328 | 5834 | |
5835 | if (this->op_ == OPERATOR_EQEQ | |
5836 | || this->op_ == OPERATOR_NOTEQ | |
5837 | || this->op_ == OPERATOR_LT | |
5838 | || this->op_ == OPERATOR_LE | |
5839 | || this->op_ == OPERATOR_GT | |
5840 | || this->op_ == OPERATOR_GE) | |
5841 | { | |
907c5ecd | 5842 | if (left_type->is_nil_type() && right_type->is_nil_type()) |
5843 | { | |
5844 | this->report_error(_("invalid comparison of nil with nil")); | |
5845 | return; | |
5846 | } | |
e440a328 | 5847 | if (!Type::are_assignable(left_type, right_type, NULL) |
5848 | && !Type::are_assignable(right_type, left_type, NULL)) | |
5849 | { | |
5850 | this->report_error(_("incompatible types in binary expression")); | |
5851 | return; | |
5852 | } | |
5853 | if (!Binary_expression::check_operator_type(this->op_, left_type, | |
be8b5eee | 5854 | right_type, |
e440a328 | 5855 | this->location()) |
5856 | || !Binary_expression::check_operator_type(this->op_, right_type, | |
be8b5eee | 5857 | left_type, |
e440a328 | 5858 | this->location())) |
5859 | { | |
5860 | this->set_is_error(); | |
5861 | return; | |
5862 | } | |
5863 | } | |
5864 | else if (this->op_ != OPERATOR_LSHIFT && this->op_ != OPERATOR_RSHIFT) | |
5865 | { | |
5866 | if (!Type::are_compatible_for_binop(left_type, right_type)) | |
5867 | { | |
5868 | this->report_error(_("incompatible types in binary expression")); | |
5869 | return; | |
5870 | } | |
5871 | if (!Binary_expression::check_operator_type(this->op_, left_type, | |
be8b5eee | 5872 | right_type, |
e440a328 | 5873 | this->location())) |
5874 | { | |
5875 | this->set_is_error(); | |
5876 | return; | |
5877 | } | |
5c65b19d | 5878 | if (this->op_ == OPERATOR_DIV || this->op_ == OPERATOR_MOD) |
5879 | { | |
5880 | // Division by a zero integer constant is an error. | |
5881 | Numeric_constant rconst; | |
5882 | unsigned long rval; | |
5883 | if (left_type->integer_type() != NULL | |
5884 | && this->right_->numeric_constant_value(&rconst) | |
5885 | && rconst.to_unsigned_long(&rval) == Numeric_constant::NC_UL_VALID | |
5886 | && rval == 0) | |
5887 | { | |
5888 | this->report_error(_("integer division by zero")); | |
5889 | return; | |
5890 | } | |
5891 | } | |
e440a328 | 5892 | } |
5893 | else | |
5894 | { | |
5895 | if (left_type->integer_type() == NULL) | |
5896 | this->report_error(_("shift of non-integer operand")); | |
5897 | ||
6b5e0fac | 5898 | if (right_type->is_string_type()) |
5899 | this->report_error(_("shift count not unsigned integer")); | |
5900 | else if (!right_type->is_abstract() | |
e440a328 | 5901 | && (right_type->integer_type() == NULL |
5902 | || !right_type->integer_type()->is_unsigned())) | |
5903 | this->report_error(_("shift count not unsigned integer")); | |
5904 | else | |
5905 | { | |
0c77715b | 5906 | Numeric_constant nc; |
5907 | if (this->right_->numeric_constant_value(&nc)) | |
e440a328 | 5908 | { |
0c77715b | 5909 | mpz_t val; |
5910 | if (!nc.to_int(&val)) | |
5911 | this->report_error(_("shift count not unsigned integer")); | |
5912 | else | |
a4eba91b | 5913 | { |
0c77715b | 5914 | if (mpz_sgn(val) < 0) |
5915 | { | |
5916 | this->report_error(_("negative shift count")); | |
0c77715b | 5917 | Location rloc = this->right_->location(); |
e67508fa | 5918 | this->right_ = Expression::make_integer_ul(0, right_type, |
5919 | rloc); | |
0c77715b | 5920 | } |
5921 | mpz_clear(val); | |
a4eba91b | 5922 | } |
e440a328 | 5923 | } |
e440a328 | 5924 | } |
5925 | } | |
5926 | } | |
5927 | ||
ea664253 | 5928 | // Get the backend representation for a binary expression. |
e440a328 | 5929 | |
ea664253 | 5930 | Bexpression* |
5931 | Binary_expression::do_get_backend(Translate_context* context) | |
e440a328 | 5932 | { |
1b1f2abf | 5933 | Gogo* gogo = context->gogo(); |
a32698ee | 5934 | Location loc = this->location(); |
5935 | Type* left_type = this->left_->type(); | |
5936 | Type* right_type = this->right_->type(); | |
1b1f2abf | 5937 | |
e440a328 | 5938 | bool use_left_type = true; |
5939 | bool is_shift_op = false; | |
29a2d1d8 | 5940 | bool is_idiv_op = false; |
e440a328 | 5941 | switch (this->op_) |
5942 | { | |
5943 | case OPERATOR_EQEQ: | |
5944 | case OPERATOR_NOTEQ: | |
5945 | case OPERATOR_LT: | |
5946 | case OPERATOR_LE: | |
5947 | case OPERATOR_GT: | |
5948 | case OPERATOR_GE: | |
ea664253 | 5949 | return Expression::comparison(context, this->type_, this->op_, |
5950 | this->left_, this->right_, loc); | |
e440a328 | 5951 | |
5952 | case OPERATOR_OROR: | |
e440a328 | 5953 | case OPERATOR_ANDAND: |
e440a328 | 5954 | use_left_type = false; |
5955 | break; | |
5956 | case OPERATOR_PLUS: | |
e440a328 | 5957 | case OPERATOR_MINUS: |
e440a328 | 5958 | case OPERATOR_OR: |
e440a328 | 5959 | case OPERATOR_XOR: |
e440a328 | 5960 | case OPERATOR_MULT: |
e440a328 | 5961 | break; |
5962 | case OPERATOR_DIV: | |
a32698ee | 5963 | if (left_type->float_type() != NULL || left_type->complex_type() != NULL) |
5964 | break; | |
729f8831 | 5965 | // Fall through. |
e440a328 | 5966 | case OPERATOR_MOD: |
29a2d1d8 | 5967 | is_idiv_op = true; |
e440a328 | 5968 | break; |
5969 | case OPERATOR_LSHIFT: | |
e440a328 | 5970 | case OPERATOR_RSHIFT: |
e440a328 | 5971 | is_shift_op = true; |
5972 | break; | |
e440a328 | 5973 | case OPERATOR_BITCLEAR: |
a32698ee | 5974 | this->right_ = Expression::make_unary(OPERATOR_XOR, this->right_, loc); |
5975 | case OPERATOR_AND: | |
e440a328 | 5976 | break; |
5977 | default: | |
c3e6f413 | 5978 | go_unreachable(); |
e440a328 | 5979 | } |
5980 | ||
736a16ba | 5981 | // The only binary operation for string is +, and that should have |
5982 | // been converted to a String_concat_expression in do_lower. | |
5983 | go_assert(!left_type->is_string_type()); | |
a32698ee | 5984 | |
5985 | // For complex division Go might want slightly different results than the | |
5986 | // backend implementation provides, so we have our own runtime routine. | |
1850e20c | 5987 | if (this->op_ == OPERATOR_DIV && this->left_->type()->complex_type() != NULL) |
5988 | { | |
a32698ee | 5989 | Runtime::Function complex_code; |
1850e20c | 5990 | switch (this->left_->type()->complex_type()->bits()) |
5991 | { | |
5992 | case 64: | |
a32698ee | 5993 | complex_code = Runtime::COMPLEX64_DIV; |
1850e20c | 5994 | break; |
5995 | case 128: | |
a32698ee | 5996 | complex_code = Runtime::COMPLEX128_DIV; |
1850e20c | 5997 | break; |
5998 | default: | |
5999 | go_unreachable(); | |
6000 | } | |
a32698ee | 6001 | Expression* complex_div = |
6002 | Runtime::make_call(complex_code, loc, 2, this->left_, this->right_); | |
ea664253 | 6003 | return complex_div->get_backend(context); |
1850e20c | 6004 | } |
6005 | ||
ea664253 | 6006 | Bexpression* left = this->left_->get_backend(context); |
6007 | Bexpression* right = this->right_->get_backend(context); | |
e440a328 | 6008 | |
a32698ee | 6009 | Type* type = use_left_type ? left_type : right_type; |
6010 | Btype* btype = type->get_backend(gogo); | |
6011 | ||
6012 | Bexpression* ret = | |
6013 | gogo->backend()->binary_expression(this->op_, left, right, loc); | |
6014 | ret = gogo->backend()->convert_expression(btype, ret, loc); | |
e440a328 | 6015 | |
a32698ee | 6016 | // Initialize overflow constants. |
6017 | Bexpression* overflow; | |
6018 | mpz_t zero; | |
6019 | mpz_init_set_ui(zero, 0UL); | |
6020 | mpz_t one; | |
6021 | mpz_init_set_ui(one, 1UL); | |
6022 | mpz_t neg_one; | |
6023 | mpz_init_set_si(neg_one, -1); | |
e440a328 | 6024 | |
a32698ee | 6025 | Btype* left_btype = left_type->get_backend(gogo); |
6026 | Btype* right_btype = right_type->get_backend(gogo); | |
e440a328 | 6027 | |
6028 | // In Go, a shift larger than the size of the type is well-defined. | |
a32698ee | 6029 | // This is not true in C, so we need to insert a conditional. |
e440a328 | 6030 | if (is_shift_op) |
6031 | { | |
a32698ee | 6032 | go_assert(left_type->integer_type() != NULL); |
e440a328 | 6033 | |
a32698ee | 6034 | int bits = left_type->integer_type()->bits(); |
a7c5b619 | 6035 | |
6036 | Numeric_constant nc; | |
6037 | unsigned long ul; | |
6038 | if (!this->right_->numeric_constant_value(&nc) | |
6039 | || nc.to_unsigned_long(&ul) != Numeric_constant::NC_UL_VALID | |
6040 | || ul >= static_cast<unsigned long>(bits)) | |
e440a328 | 6041 | { |
a7c5b619 | 6042 | mpz_t bitsval; |
6043 | mpz_init_set_ui(bitsval, bits); | |
6044 | Bexpression* bits_expr = | |
6045 | gogo->backend()->integer_constant_expression(right_btype, bitsval); | |
6046 | Bexpression* compare = | |
6047 | gogo->backend()->binary_expression(OPERATOR_LT, | |
6048 | right, bits_expr, loc); | |
6049 | ||
6050 | Bexpression* zero_expr = | |
6051 | gogo->backend()->integer_constant_expression(left_btype, zero); | |
6052 | overflow = zero_expr; | |
6053 | Bfunction* bfn = context->function()->func_value()->get_decl(); | |
6054 | if (this->op_ == OPERATOR_RSHIFT | |
6055 | && !left_type->integer_type()->is_unsigned()) | |
6056 | { | |
6057 | Bexpression* neg_expr = | |
6058 | gogo->backend()->binary_expression(OPERATOR_LT, left, | |
6059 | zero_expr, loc); | |
6060 | Bexpression* neg_one_expr = | |
6061 | gogo->backend()->integer_constant_expression(left_btype, | |
6062 | neg_one); | |
6063 | overflow = gogo->backend()->conditional_expression(bfn, | |
6064 | btype, | |
6065 | neg_expr, | |
6066 | neg_one_expr, | |
6067 | zero_expr, | |
6068 | loc); | |
6069 | } | |
6070 | ret = gogo->backend()->conditional_expression(bfn, btype, compare, | |
6071 | ret, overflow, loc); | |
6072 | mpz_clear(bitsval); | |
29a2d1d8 | 6073 | } |
29a2d1d8 | 6074 | } |
6075 | ||
6076 | // Add checks for division by zero and division overflow as needed. | |
6077 | if (is_idiv_op) | |
6078 | { | |
5c3f3470 | 6079 | if (gogo->check_divide_by_zero()) |
29a2d1d8 | 6080 | { |
6081 | // right == 0 | |
a32698ee | 6082 | Bexpression* zero_expr = |
6083 | gogo->backend()->integer_constant_expression(right_btype, zero); | |
6084 | Bexpression* check = | |
6085 | gogo->backend()->binary_expression(OPERATOR_EQEQ, | |
6086 | right, zero_expr, loc); | |
29a2d1d8 | 6087 | |
a32698ee | 6088 | // __go_runtime_error(RUNTIME_ERROR_DIVISION_BY_ZERO) |
29a2d1d8 | 6089 | int errcode = RUNTIME_ERROR_DIVISION_BY_ZERO; |
ea664253 | 6090 | Bexpression* crash = gogo->runtime_error(errcode, |
6091 | loc)->get_backend(context); | |
29a2d1d8 | 6092 | |
6093 | // right == 0 ? (__go_runtime_error(...), 0) : ret | |
93715b75 | 6094 | Bfunction* bfn = context->function()->func_value()->get_decl(); |
6095 | ret = gogo->backend()->conditional_expression(bfn, btype, | |
6096 | check, crash, | |
ea664253 | 6097 | ret, loc); |
b13c66cd | 6098 | } |
6099 | ||
5c3f3470 | 6100 | if (gogo->check_divide_overflow()) |
29a2d1d8 | 6101 | { |
6102 | // right == -1 | |
6103 | // FIXME: It would be nice to say that this test is expected | |
6104 | // to return false. | |
a32698ee | 6105 | |
6106 | Bexpression* neg_one_expr = | |
6107 | gogo->backend()->integer_constant_expression(right_btype, neg_one); | |
6108 | Bexpression* check = | |
6109 | gogo->backend()->binary_expression(OPERATOR_EQEQ, | |
6110 | right, neg_one_expr, loc); | |
6111 | ||
6112 | Bexpression* zero_expr = | |
6113 | gogo->backend()->integer_constant_expression(btype, zero); | |
6114 | Bexpression* one_expr = | |
6115 | gogo->backend()->integer_constant_expression(btype, one); | |
93715b75 | 6116 | Bfunction* bfn = context->function()->func_value()->get_decl(); |
a32698ee | 6117 | |
6118 | if (type->integer_type()->is_unsigned()) | |
29a2d1d8 | 6119 | { |
6120 | // An unsigned -1 is the largest possible number, so | |
6121 | // dividing is always 1 or 0. | |
a32698ee | 6122 | |
6123 | Bexpression* cmp = | |
6124 | gogo->backend()->binary_expression(OPERATOR_EQEQ, | |
6125 | left, right, loc); | |
29a2d1d8 | 6126 | if (this->op_ == OPERATOR_DIV) |
a32698ee | 6127 | overflow = |
93715b75 | 6128 | gogo->backend()->conditional_expression(bfn, btype, cmp, |
a32698ee | 6129 | one_expr, zero_expr, |
6130 | loc); | |
29a2d1d8 | 6131 | else |
a32698ee | 6132 | overflow = |
93715b75 | 6133 | gogo->backend()->conditional_expression(bfn, btype, cmp, |
a32698ee | 6134 | zero_expr, left, |
6135 | loc); | |
29a2d1d8 | 6136 | } |
6137 | else | |
6138 | { | |
6139 | // Computing left / -1 is the same as computing - left, | |
6140 | // which does not overflow since Go sets -fwrapv. | |
6141 | if (this->op_ == OPERATOR_DIV) | |
a32698ee | 6142 | { |
6143 | Expression* negate_expr = | |
6144 | Expression::make_unary(OPERATOR_MINUS, this->left_, loc); | |
ea664253 | 6145 | overflow = negate_expr->get_backend(context); |
a32698ee | 6146 | } |
29a2d1d8 | 6147 | else |
a32698ee | 6148 | overflow = zero_expr; |
29a2d1d8 | 6149 | } |
a32698ee | 6150 | overflow = gogo->backend()->convert_expression(btype, overflow, loc); |
29a2d1d8 | 6151 | |
6152 | // right == -1 ? - left : ret | |
93715b75 | 6153 | ret = gogo->backend()->conditional_expression(bfn, btype, |
6154 | check, overflow, | |
a32698ee | 6155 | ret, loc); |
29a2d1d8 | 6156 | } |
e440a328 | 6157 | } |
6158 | ||
a32698ee | 6159 | mpz_clear(zero); |
6160 | mpz_clear(one); | |
6161 | mpz_clear(neg_one); | |
ea664253 | 6162 | return ret; |
e440a328 | 6163 | } |
6164 | ||
6165 | // Export a binary expression. | |
6166 | ||
6167 | void | |
6168 | Binary_expression::do_export(Export* exp) const | |
6169 | { | |
6170 | exp->write_c_string("("); | |
6171 | this->left_->export_expression(exp); | |
6172 | switch (this->op_) | |
6173 | { | |
6174 | case OPERATOR_OROR: | |
6175 | exp->write_c_string(" || "); | |
6176 | break; | |
6177 | case OPERATOR_ANDAND: | |
6178 | exp->write_c_string(" && "); | |
6179 | break; | |
6180 | case OPERATOR_EQEQ: | |
6181 | exp->write_c_string(" == "); | |
6182 | break; | |
6183 | case OPERATOR_NOTEQ: | |
6184 | exp->write_c_string(" != "); | |
6185 | break; | |
6186 | case OPERATOR_LT: | |
6187 | exp->write_c_string(" < "); | |
6188 | break; | |
6189 | case OPERATOR_LE: | |
6190 | exp->write_c_string(" <= "); | |
6191 | break; | |
6192 | case OPERATOR_GT: | |
6193 | exp->write_c_string(" > "); | |
6194 | break; | |
6195 | case OPERATOR_GE: | |
6196 | exp->write_c_string(" >= "); | |
6197 | break; | |
6198 | case OPERATOR_PLUS: | |
6199 | exp->write_c_string(" + "); | |
6200 | break; | |
6201 | case OPERATOR_MINUS: | |
6202 | exp->write_c_string(" - "); | |
6203 | break; | |
6204 | case OPERATOR_OR: | |
6205 | exp->write_c_string(" | "); | |
6206 | break; | |
6207 | case OPERATOR_XOR: | |
6208 | exp->write_c_string(" ^ "); | |
6209 | break; | |
6210 | case OPERATOR_MULT: | |
6211 | exp->write_c_string(" * "); | |
6212 | break; | |
6213 | case OPERATOR_DIV: | |
6214 | exp->write_c_string(" / "); | |
6215 | break; | |
6216 | case OPERATOR_MOD: | |
6217 | exp->write_c_string(" % "); | |
6218 | break; | |
6219 | case OPERATOR_LSHIFT: | |
6220 | exp->write_c_string(" << "); | |
6221 | break; | |
6222 | case OPERATOR_RSHIFT: | |
6223 | exp->write_c_string(" >> "); | |
6224 | break; | |
6225 | case OPERATOR_AND: | |
6226 | exp->write_c_string(" & "); | |
6227 | break; | |
6228 | case OPERATOR_BITCLEAR: | |
6229 | exp->write_c_string(" &^ "); | |
6230 | break; | |
6231 | default: | |
c3e6f413 | 6232 | go_unreachable(); |
e440a328 | 6233 | } |
6234 | this->right_->export_expression(exp); | |
6235 | exp->write_c_string(")"); | |
6236 | } | |
6237 | ||
6238 | // Import a binary expression. | |
6239 | ||
6240 | Expression* | |
6241 | Binary_expression::do_import(Import* imp) | |
6242 | { | |
6243 | imp->require_c_string("("); | |
6244 | ||
6245 | Expression* left = Expression::import_expression(imp); | |
6246 | ||
6247 | Operator op; | |
6248 | if (imp->match_c_string(" || ")) | |
6249 | { | |
6250 | op = OPERATOR_OROR; | |
6251 | imp->advance(4); | |
6252 | } | |
6253 | else if (imp->match_c_string(" && ")) | |
6254 | { | |
6255 | op = OPERATOR_ANDAND; | |
6256 | imp->advance(4); | |
6257 | } | |
6258 | else if (imp->match_c_string(" == ")) | |
6259 | { | |
6260 | op = OPERATOR_EQEQ; | |
6261 | imp->advance(4); | |
6262 | } | |
6263 | else if (imp->match_c_string(" != ")) | |
6264 | { | |
6265 | op = OPERATOR_NOTEQ; | |
6266 | imp->advance(4); | |
6267 | } | |
6268 | else if (imp->match_c_string(" < ")) | |
6269 | { | |
6270 | op = OPERATOR_LT; | |
6271 | imp->advance(3); | |
6272 | } | |
6273 | else if (imp->match_c_string(" <= ")) | |
6274 | { | |
6275 | op = OPERATOR_LE; | |
6276 | imp->advance(4); | |
6277 | } | |
6278 | else if (imp->match_c_string(" > ")) | |
6279 | { | |
6280 | op = OPERATOR_GT; | |
6281 | imp->advance(3); | |
6282 | } | |
6283 | else if (imp->match_c_string(" >= ")) | |
6284 | { | |
6285 | op = OPERATOR_GE; | |
6286 | imp->advance(4); | |
6287 | } | |
6288 | else if (imp->match_c_string(" + ")) | |
6289 | { | |
6290 | op = OPERATOR_PLUS; | |
6291 | imp->advance(3); | |
6292 | } | |
6293 | else if (imp->match_c_string(" - ")) | |
6294 | { | |
6295 | op = OPERATOR_MINUS; | |
6296 | imp->advance(3); | |
6297 | } | |
6298 | else if (imp->match_c_string(" | ")) | |
6299 | { | |
6300 | op = OPERATOR_OR; | |
6301 | imp->advance(3); | |
6302 | } | |
6303 | else if (imp->match_c_string(" ^ ")) | |
6304 | { | |
6305 | op = OPERATOR_XOR; | |
6306 | imp->advance(3); | |
6307 | } | |
6308 | else if (imp->match_c_string(" * ")) | |
6309 | { | |
6310 | op = OPERATOR_MULT; | |
6311 | imp->advance(3); | |
6312 | } | |
6313 | else if (imp->match_c_string(" / ")) | |
6314 | { | |
6315 | op = OPERATOR_DIV; | |
6316 | imp->advance(3); | |
6317 | } | |
6318 | else if (imp->match_c_string(" % ")) | |
6319 | { | |
6320 | op = OPERATOR_MOD; | |
6321 | imp->advance(3); | |
6322 | } | |
6323 | else if (imp->match_c_string(" << ")) | |
6324 | { | |
6325 | op = OPERATOR_LSHIFT; | |
6326 | imp->advance(4); | |
6327 | } | |
6328 | else if (imp->match_c_string(" >> ")) | |
6329 | { | |
6330 | op = OPERATOR_RSHIFT; | |
6331 | imp->advance(4); | |
6332 | } | |
6333 | else if (imp->match_c_string(" & ")) | |
6334 | { | |
6335 | op = OPERATOR_AND; | |
6336 | imp->advance(3); | |
6337 | } | |
6338 | else if (imp->match_c_string(" &^ ")) | |
6339 | { | |
6340 | op = OPERATOR_BITCLEAR; | |
6341 | imp->advance(4); | |
6342 | } | |
6343 | else | |
6344 | { | |
631d5788 | 6345 | go_error_at(imp->location(), "unrecognized binary operator"); |
e440a328 | 6346 | return Expression::make_error(imp->location()); |
6347 | } | |
6348 | ||
6349 | Expression* right = Expression::import_expression(imp); | |
6350 | ||
6351 | imp->require_c_string(")"); | |
6352 | ||
6353 | return Expression::make_binary(op, left, right, imp->location()); | |
6354 | } | |
6355 | ||
d751bb78 | 6356 | // Dump ast representation of a binary expression. |
6357 | ||
6358 | void | |
6359 | Binary_expression::do_dump_expression(Ast_dump_context* ast_dump_context) const | |
6360 | { | |
6361 | ast_dump_context->ostream() << "("; | |
6362 | ast_dump_context->dump_expression(this->left_); | |
6363 | ast_dump_context->ostream() << " "; | |
6364 | ast_dump_context->dump_operator(this->op_); | |
6365 | ast_dump_context->ostream() << " "; | |
6366 | ast_dump_context->dump_expression(this->right_); | |
6367 | ast_dump_context->ostream() << ") "; | |
6368 | } | |
6369 | ||
e440a328 | 6370 | // Make a binary expression. |
6371 | ||
6372 | Expression* | |
6373 | Expression::make_binary(Operator op, Expression* left, Expression* right, | |
b13c66cd | 6374 | Location location) |
e440a328 | 6375 | { |
6376 | return new Binary_expression(op, left, right, location); | |
6377 | } | |
6378 | ||
6379 | // Implement a comparison. | |
6380 | ||
a32698ee | 6381 | Bexpression* |
6382 | Expression::comparison(Translate_context* context, Type* result_type, | |
6383 | Operator op, Expression* left, Expression* right, | |
6384 | Location location) | |
e440a328 | 6385 | { |
2387f644 | 6386 | Type* left_type = left->type(); |
6387 | Type* right_type = right->type(); | |
ceeb12d7 | 6388 | |
e67508fa | 6389 | Expression* zexpr = Expression::make_integer_ul(0, NULL, location); |
1b1f2abf | 6390 | |
15c67ee2 | 6391 | if (left_type->is_string_type() && right_type->is_string_type()) |
e440a328 | 6392 | { |
6098d6cb | 6393 | if (op == OPERATOR_EQEQ || op == OPERATOR_NOTEQ) |
6394 | { | |
6395 | left = Runtime::make_call(Runtime::EQSTRING, location, 2, | |
6396 | left, right); | |
6397 | right = Expression::make_boolean(true, location); | |
6398 | } | |
6399 | else | |
6400 | { | |
6401 | left = Runtime::make_call(Runtime::CMPSTRING, location, 2, | |
6402 | left, right); | |
6403 | right = zexpr; | |
6404 | } | |
e440a328 | 6405 | } |
15c67ee2 | 6406 | else if ((left_type->interface_type() != NULL |
6407 | && right_type->interface_type() == NULL | |
6408 | && !right_type->is_nil_type()) | |
6409 | || (left_type->interface_type() == NULL | |
6410 | && !left_type->is_nil_type() | |
6411 | && right_type->interface_type() != NULL)) | |
e440a328 | 6412 | { |
6413 | // Comparing an interface value to a non-interface value. | |
6414 | if (left_type->interface_type() == NULL) | |
6415 | { | |
6416 | std::swap(left_type, right_type); | |
2387f644 | 6417 | std::swap(left, right); |
e440a328 | 6418 | } |
6419 | ||
6420 | // The right operand is not an interface. We need to take its | |
6421 | // address if it is not a pointer. | |
ceeb12d7 | 6422 | Expression* pointer_arg = NULL; |
e440a328 | 6423 | if (right_type->points_to() != NULL) |
2387f644 | 6424 | pointer_arg = right; |
e440a328 | 6425 | else |
6426 | { | |
2387f644 | 6427 | go_assert(right->is_addressable()); |
6428 | pointer_arg = Expression::make_unary(OPERATOR_AND, right, | |
ceeb12d7 | 6429 | location); |
e440a328 | 6430 | } |
e440a328 | 6431 | |
2387f644 | 6432 | Expression* descriptor = |
6433 | Expression::make_type_descriptor(right_type, location); | |
6434 | left = | |
ceeb12d7 | 6435 | Runtime::make_call((left_type->interface_type()->is_empty() |
6098d6cb | 6436 | ? Runtime::EFACEVALEQ |
6437 | : Runtime::IFACEVALEQ), | |
2387f644 | 6438 | location, 3, left, descriptor, |
ceeb12d7 | 6439 | pointer_arg); |
6098d6cb | 6440 | go_assert(op == OPERATOR_EQEQ || op == OPERATOR_NOTEQ); |
6441 | right = Expression::make_boolean(true, location); | |
e440a328 | 6442 | } |
6443 | else if (left_type->interface_type() != NULL | |
6444 | && right_type->interface_type() != NULL) | |
6445 | { | |
ceeb12d7 | 6446 | Runtime::Function compare_function; |
739bad04 | 6447 | if (left_type->interface_type()->is_empty() |
6448 | && right_type->interface_type()->is_empty()) | |
6098d6cb | 6449 | compare_function = Runtime::EFACEEQ; |
739bad04 | 6450 | else if (!left_type->interface_type()->is_empty() |
6451 | && !right_type->interface_type()->is_empty()) | |
6098d6cb | 6452 | compare_function = Runtime::IFACEEQ; |
739bad04 | 6453 | else |
6454 | { | |
6455 | if (left_type->interface_type()->is_empty()) | |
6456 | { | |
739bad04 | 6457 | std::swap(left_type, right_type); |
2387f644 | 6458 | std::swap(left, right); |
739bad04 | 6459 | } |
c484d925 | 6460 | go_assert(!left_type->interface_type()->is_empty()); |
6461 | go_assert(right_type->interface_type()->is_empty()); | |
6098d6cb | 6462 | compare_function = Runtime::IFACEEFACEEQ; |
739bad04 | 6463 | } |
6464 | ||
2387f644 | 6465 | left = Runtime::make_call(compare_function, location, 2, left, right); |
6098d6cb | 6466 | go_assert(op == OPERATOR_EQEQ || op == OPERATOR_NOTEQ); |
6467 | right = Expression::make_boolean(true, location); | |
e440a328 | 6468 | } |
6469 | ||
6470 | if (left_type->is_nil_type() | |
6471 | && (op == OPERATOR_EQEQ || op == OPERATOR_NOTEQ)) | |
6472 | { | |
6473 | std::swap(left_type, right_type); | |
2387f644 | 6474 | std::swap(left, right); |
e440a328 | 6475 | } |
6476 | ||
6477 | if (right_type->is_nil_type()) | |
6478 | { | |
2387f644 | 6479 | right = Expression::make_nil(location); |
e440a328 | 6480 | if (left_type->array_type() != NULL |
6481 | && left_type->array_type()->length() == NULL) | |
6482 | { | |
6483 | Array_type* at = left_type->array_type(); | |
44dbe1d7 | 6484 | bool is_lvalue = false; |
6485 | left = at->get_value_pointer(context->gogo(), left, is_lvalue); | |
e440a328 | 6486 | } |
6487 | else if (left_type->interface_type() != NULL) | |
6488 | { | |
6489 | // An interface is nil if the first field is nil. | |
2387f644 | 6490 | left = Expression::make_field_reference(left, 0, location); |
e440a328 | 6491 | } |
6492 | } | |
6493 | ||
ea664253 | 6494 | Bexpression* left_bexpr = left->get_backend(context); |
6495 | Bexpression* right_bexpr = right->get_backend(context); | |
e90c9dfc | 6496 | |
a32698ee | 6497 | Gogo* gogo = context->gogo(); |
6498 | Bexpression* ret = gogo->backend()->binary_expression(op, left_bexpr, | |
6499 | right_bexpr, location); | |
6500 | if (result_type != NULL) | |
6501 | ret = gogo->backend()->convert_expression(result_type->get_backend(gogo), | |
6502 | ret, location); | |
e440a328 | 6503 | return ret; |
6504 | } | |
6505 | ||
736a16ba | 6506 | // Class String_concat_expression. |
6507 | ||
6508 | bool | |
6509 | String_concat_expression::do_is_constant() const | |
6510 | { | |
6511 | for (Expression_list::const_iterator pe = this->exprs_->begin(); | |
6512 | pe != this->exprs_->end(); | |
6513 | ++pe) | |
6514 | { | |
6515 | if (!(*pe)->is_constant()) | |
6516 | return false; | |
6517 | } | |
6518 | return true; | |
6519 | } | |
6520 | ||
6521 | bool | |
3ae06f68 | 6522 | String_concat_expression::do_is_static_initializer() const |
736a16ba | 6523 | { |
6524 | for (Expression_list::const_iterator pe = this->exprs_->begin(); | |
6525 | pe != this->exprs_->end(); | |
6526 | ++pe) | |
6527 | { | |
3ae06f68 | 6528 | if (!(*pe)->is_static_initializer()) |
736a16ba | 6529 | return false; |
6530 | } | |
6531 | return true; | |
6532 | } | |
6533 | ||
6534 | Type* | |
6535 | String_concat_expression::do_type() | |
6536 | { | |
6537 | Type* t = this->exprs_->front()->type(); | |
6538 | Expression_list::iterator pe = this->exprs_->begin(); | |
6539 | ++pe; | |
6540 | for (; pe != this->exprs_->end(); ++pe) | |
6541 | { | |
6542 | Type* t1; | |
6543 | if (!Binary_expression::operation_type(OPERATOR_PLUS, t, | |
6544 | (*pe)->type(), | |
6545 | &t1)) | |
6546 | return Type::make_error_type(); | |
6547 | t = t1; | |
6548 | } | |
6549 | return t; | |
6550 | } | |
6551 | ||
6552 | void | |
6553 | String_concat_expression::do_determine_type(const Type_context* context) | |
6554 | { | |
6555 | Type_context subcontext(*context); | |
6556 | for (Expression_list::iterator pe = this->exprs_->begin(); | |
6557 | pe != this->exprs_->end(); | |
6558 | ++pe) | |
6559 | { | |
6560 | Type* t = (*pe)->type(); | |
6561 | if (!t->is_abstract()) | |
6562 | { | |
6563 | subcontext.type = t; | |
6564 | break; | |
6565 | } | |
6566 | } | |
6567 | if (subcontext.type == NULL) | |
6568 | subcontext.type = this->exprs_->front()->type(); | |
6569 | for (Expression_list::iterator pe = this->exprs_->begin(); | |
6570 | pe != this->exprs_->end(); | |
6571 | ++pe) | |
6572 | (*pe)->determine_type(&subcontext); | |
6573 | } | |
6574 | ||
6575 | void | |
6576 | String_concat_expression::do_check_types(Gogo*) | |
6577 | { | |
6578 | if (this->is_error_expression()) | |
6579 | return; | |
6580 | Type* t = this->exprs_->front()->type(); | |
6581 | if (t->is_error()) | |
6582 | { | |
6583 | this->set_is_error(); | |
6584 | return; | |
6585 | } | |
6586 | Expression_list::iterator pe = this->exprs_->begin(); | |
6587 | ++pe; | |
6588 | for (; pe != this->exprs_->end(); ++pe) | |
6589 | { | |
6590 | Type* t1 = (*pe)->type(); | |
6591 | if (!Type::are_compatible_for_binop(t, t1)) | |
6592 | { | |
6593 | this->report_error("incompatible types in binary expression"); | |
6594 | return; | |
6595 | } | |
6596 | if (!Binary_expression::check_operator_type(OPERATOR_PLUS, t, t1, | |
6597 | this->location())) | |
6598 | { | |
6599 | this->set_is_error(); | |
6600 | return; | |
6601 | } | |
6602 | } | |
6603 | } | |
6604 | ||
6605 | Expression* | |
6606 | String_concat_expression::do_flatten(Gogo*, Named_object*, | |
6607 | Statement_inserter*) | |
6608 | { | |
6609 | if (this->is_error_expression()) | |
6610 | return this; | |
6611 | Location loc = this->location(); | |
6612 | Type* type = this->type(); | |
6613 | Expression* nil_arg = Expression::make_nil(loc); | |
6614 | Expression* call; | |
6615 | switch (this->exprs_->size()) | |
6616 | { | |
6617 | case 0: case 1: | |
6618 | go_unreachable(); | |
6619 | ||
6620 | case 2: case 3: case 4: case 5: | |
6621 | { | |
6622 | Expression* len = Expression::make_integer_ul(this->exprs_->size(), | |
6623 | NULL, loc); | |
6624 | Array_type* arg_type = Type::make_array_type(type, len); | |
6625 | arg_type->set_is_array_incomparable(); | |
6626 | Expression* arg = | |
6627 | Expression::make_array_composite_literal(arg_type, this->exprs_, | |
6628 | loc); | |
6629 | Runtime::Function code; | |
6630 | switch (this->exprs_->size()) | |
6631 | { | |
6632 | default: | |
6633 | go_unreachable(); | |
6634 | case 2: | |
6635 | code = Runtime::CONCATSTRING2; | |
6636 | break; | |
6637 | case 3: | |
6638 | code = Runtime::CONCATSTRING3; | |
6639 | break; | |
6640 | case 4: | |
6641 | code = Runtime::CONCATSTRING4; | |
6642 | break; | |
6643 | case 5: | |
6644 | code = Runtime::CONCATSTRING5; | |
6645 | break; | |
6646 | } | |
6647 | call = Runtime::make_call(code, loc, 2, nil_arg, arg); | |
6648 | } | |
6649 | break; | |
6650 | ||
6651 | default: | |
6652 | { | |
6653 | Type* arg_type = Type::make_array_type(type, NULL); | |
6654 | Slice_construction_expression* sce = | |
6655 | Expression::make_slice_composite_literal(arg_type, this->exprs_, | |
6656 | loc); | |
6657 | sce->set_storage_does_not_escape(); | |
6658 | call = Runtime::make_call(Runtime::CONCATSTRINGS, loc, 2, nil_arg, | |
6659 | sce); | |
6660 | } | |
6661 | break; | |
6662 | } | |
6663 | ||
6664 | return Expression::make_cast(type, call, loc); | |
6665 | } | |
6666 | ||
6667 | void | |
6668 | String_concat_expression::do_dump_expression( | |
6669 | Ast_dump_context* ast_dump_context) const | |
6670 | { | |
6671 | ast_dump_context->ostream() << "concat("; | |
6672 | ast_dump_context->dump_expression_list(this->exprs_, false); | |
6673 | ast_dump_context->ostream() << ")"; | |
6674 | } | |
6675 | ||
6676 | Expression* | |
6677 | Expression::make_string_concat(Expression_list* exprs) | |
6678 | { | |
6679 | return new String_concat_expression(exprs); | |
6680 | } | |
6681 | ||
e440a328 | 6682 | // Class Bound_method_expression. |
6683 | ||
6684 | // Traversal. | |
6685 | ||
6686 | int | |
6687 | Bound_method_expression::do_traverse(Traverse* traverse) | |
6688 | { | |
e0659c9e | 6689 | return Expression::traverse(&this->expr_, traverse); |
e440a328 | 6690 | } |
6691 | ||
6692 | // Return the type of a bound method expression. The type of this | |
0afbb937 | 6693 | // object is simply the type of the method with no receiver. |
e440a328 | 6694 | |
6695 | Type* | |
6696 | Bound_method_expression::do_type() | |
6697 | { | |
0afbb937 | 6698 | Named_object* fn = this->method_->named_object(); |
6699 | Function_type* fntype; | |
6700 | if (fn->is_function()) | |
6701 | fntype = fn->func_value()->type(); | |
6702 | else if (fn->is_function_declaration()) | |
6703 | fntype = fn->func_declaration_value()->type(); | |
e0659c9e | 6704 | else |
6705 | return Type::make_error_type(); | |
0afbb937 | 6706 | return fntype->copy_without_receiver(); |
e440a328 | 6707 | } |
6708 | ||
6709 | // Determine the types of a method expression. | |
6710 | ||
6711 | void | |
6712 | Bound_method_expression::do_determine_type(const Type_context*) | |
6713 | { | |
0afbb937 | 6714 | Named_object* fn = this->method_->named_object(); |
6715 | Function_type* fntype; | |
6716 | if (fn->is_function()) | |
6717 | fntype = fn->func_value()->type(); | |
6718 | else if (fn->is_function_declaration()) | |
6719 | fntype = fn->func_declaration_value()->type(); | |
6720 | else | |
6721 | fntype = NULL; | |
e440a328 | 6722 | if (fntype == NULL || !fntype->is_method()) |
6723 | this->expr_->determine_type_no_context(); | |
6724 | else | |
6725 | { | |
6726 | Type_context subcontext(fntype->receiver()->type(), false); | |
6727 | this->expr_->determine_type(&subcontext); | |
6728 | } | |
6729 | } | |
6730 | ||
6731 | // Check the types of a method expression. | |
6732 | ||
6733 | void | |
6734 | Bound_method_expression::do_check_types(Gogo*) | |
6735 | { | |
0afbb937 | 6736 | Named_object* fn = this->method_->named_object(); |
6737 | if (!fn->is_function() && !fn->is_function_declaration()) | |
6738 | { | |
6739 | this->report_error(_("object is not a method")); | |
6740 | return; | |
6741 | } | |
6742 | ||
6743 | Function_type* fntype; | |
6744 | if (fn->is_function()) | |
6745 | fntype = fn->func_value()->type(); | |
6746 | else if (fn->is_function_declaration()) | |
6747 | fntype = fn->func_declaration_value()->type(); | |
e440a328 | 6748 | else |
0afbb937 | 6749 | go_unreachable(); |
6750 | Type* rtype = fntype->receiver()->type()->deref(); | |
6751 | Type* etype = (this->expr_type_ != NULL | |
6752 | ? this->expr_type_ | |
6753 | : this->expr_->type()); | |
6754 | etype = etype->deref(); | |
6755 | if (!Type::are_identical(rtype, etype, true, NULL)) | |
6756 | this->report_error(_("method type does not match object type")); | |
6757 | } | |
6758 | ||
6759 | // If a bound method expression is not simply called, then it is | |
6760 | // represented as a closure. The closure will hold a single variable, | |
6761 | // the receiver to pass to the method. The function will be a simple | |
6762 | // thunk that pulls that value from the closure and calls the method | |
6763 | // with the remaining arguments. | |
6764 | // | |
6765 | // Because method values are not common, we don't build all thunks for | |
6766 | // every methods, but instead only build them as we need them. In | |
6767 | // particular, we even build them on demand for methods defined in | |
6768 | // other packages. | |
6769 | ||
6770 | Bound_method_expression::Method_value_thunks | |
6771 | Bound_method_expression::method_value_thunks; | |
6772 | ||
6773 | // Find or create the thunk for METHOD. | |
6774 | ||
6775 | Named_object* | |
6776 | Bound_method_expression::create_thunk(Gogo* gogo, const Method* method, | |
6777 | Named_object* fn) | |
6778 | { | |
6779 | std::pair<Named_object*, Named_object*> val(fn, NULL); | |
6780 | std::pair<Method_value_thunks::iterator, bool> ins = | |
6781 | Bound_method_expression::method_value_thunks.insert(val); | |
6782 | if (!ins.second) | |
6783 | { | |
6784 | // We have seen this method before. | |
6785 | go_assert(ins.first->second != NULL); | |
6786 | return ins.first->second; | |
6787 | } | |
6788 | ||
6789 | Location loc = fn->location(); | |
6790 | ||
6791 | Function_type* orig_fntype; | |
6792 | if (fn->is_function()) | |
6793 | orig_fntype = fn->func_value()->type(); | |
6794 | else if (fn->is_function_declaration()) | |
6795 | orig_fntype = fn->func_declaration_value()->type(); | |
6796 | else | |
6797 | orig_fntype = NULL; | |
6798 | ||
6799 | if (orig_fntype == NULL || !orig_fntype->is_method()) | |
e440a328 | 6800 | { |
0afbb937 | 6801 | ins.first->second = Named_object::make_erroneous_name(Gogo::thunk_name()); |
6802 | return ins.first->second; | |
e440a328 | 6803 | } |
0afbb937 | 6804 | |
6805 | Struct_field_list* sfl = new Struct_field_list(); | |
f8bdf81a | 6806 | // The type here is wrong--it should be the C function type. But it |
6807 | // doesn't really matter. | |
0afbb937 | 6808 | Type* vt = Type::make_pointer_type(Type::make_void_type()); |
6809 | sfl->push_back(Struct_field(Typed_identifier("fn.0", vt, loc))); | |
6810 | sfl->push_back(Struct_field(Typed_identifier("val.1", | |
6811 | orig_fntype->receiver()->type(), | |
6812 | loc))); | |
6bf4793c | 6813 | Struct_type* st = Type::make_struct_type(sfl, loc); |
6814 | st->set_is_struct_incomparable(); | |
6815 | Type* closure_type = Type::make_pointer_type(st); | |
0afbb937 | 6816 | |
f8bdf81a | 6817 | Function_type* new_fntype = orig_fntype->copy_with_names(); |
0afbb937 | 6818 | |
da244e59 | 6819 | std::string thunk_name = Gogo::thunk_name(); |
6820 | Named_object* new_no = gogo->start_function(thunk_name, new_fntype, | |
0afbb937 | 6821 | false, loc); |
6822 | ||
f8bdf81a | 6823 | Variable* cvar = new Variable(closure_type, NULL, false, false, false, loc); |
6824 | cvar->set_is_used(); | |
1ecc6157 | 6825 | cvar->set_is_closure(); |
da244e59 | 6826 | Named_object* cp = Named_object::make_variable("$closure" + thunk_name, |
6827 | NULL, cvar); | |
f8bdf81a | 6828 | new_no->func_value()->set_closure_var(cp); |
0afbb937 | 6829 | |
f8bdf81a | 6830 | gogo->start_block(loc); |
0afbb937 | 6831 | |
6832 | // Field 0 of the closure is the function code pointer, field 1 is | |
6833 | // the value on which to invoke the method. | |
6834 | Expression* arg = Expression::make_var_reference(cp, loc); | |
6835 | arg = Expression::make_unary(OPERATOR_MULT, arg, loc); | |
6836 | arg = Expression::make_field_reference(arg, 1, loc); | |
6837 | ||
6838 | Expression* bme = Expression::make_bound_method(arg, method, fn, loc); | |
6839 | ||
6840 | const Typed_identifier_list* orig_params = orig_fntype->parameters(); | |
6841 | Expression_list* args; | |
6842 | if (orig_params == NULL || orig_params->empty()) | |
6843 | args = NULL; | |
6844 | else | |
6845 | { | |
6846 | const Typed_identifier_list* new_params = new_fntype->parameters(); | |
6847 | args = new Expression_list(); | |
6848 | for (Typed_identifier_list::const_iterator p = new_params->begin(); | |
f8bdf81a | 6849 | p != new_params->end(); |
0afbb937 | 6850 | ++p) |
6851 | { | |
6852 | Named_object* p_no = gogo->lookup(p->name(), NULL); | |
6853 | go_assert(p_no != NULL | |
6854 | && p_no->is_variable() | |
6855 | && p_no->var_value()->is_parameter()); | |
6856 | args->push_back(Expression::make_var_reference(p_no, loc)); | |
6857 | } | |
6858 | } | |
6859 | ||
6860 | Call_expression* call = Expression::make_call(bme, args, | |
6861 | orig_fntype->is_varargs(), | |
6862 | loc); | |
6863 | call->set_varargs_are_lowered(); | |
6864 | ||
6865 | Statement* s = Statement::make_return_from_call(call, loc); | |
6866 | gogo->add_statement(s); | |
6867 | Block* b = gogo->finish_block(loc); | |
6868 | gogo->add_block(b, loc); | |
6869 | gogo->lower_block(new_no, b); | |
a32698ee | 6870 | gogo->flatten_block(new_no, b); |
0afbb937 | 6871 | gogo->finish_function(loc); |
6872 | ||
6873 | ins.first->second = new_no; | |
6874 | return new_no; | |
6875 | } | |
6876 | ||
6877 | // Return an expression to check *REF for nil while dereferencing | |
6878 | // according to FIELD_INDEXES. Update *REF to build up the field | |
6879 | // reference. This is a static function so that we don't have to | |
6880 | // worry about declaring Field_indexes in expressions.h. | |
6881 | ||
6882 | static Expression* | |
6883 | bme_check_nil(const Method::Field_indexes* field_indexes, Location loc, | |
6884 | Expression** ref) | |
6885 | { | |
6886 | if (field_indexes == NULL) | |
6887 | return Expression::make_boolean(false, loc); | |
6888 | Expression* cond = bme_check_nil(field_indexes->next, loc, ref); | |
6889 | Struct_type* stype = (*ref)->type()->deref()->struct_type(); | |
6890 | go_assert(stype != NULL | |
6891 | && field_indexes->field_index < stype->field_count()); | |
6892 | if ((*ref)->type()->struct_type() == NULL) | |
6893 | { | |
6894 | go_assert((*ref)->type()->points_to() != NULL); | |
6895 | Expression* n = Expression::make_binary(OPERATOR_EQEQ, *ref, | |
6896 | Expression::make_nil(loc), | |
6897 | loc); | |
6898 | cond = Expression::make_binary(OPERATOR_OROR, cond, n, loc); | |
6899 | *ref = Expression::make_unary(OPERATOR_MULT, *ref, loc); | |
6900 | go_assert((*ref)->type()->struct_type() == stype); | |
6901 | } | |
6902 | *ref = Expression::make_field_reference(*ref, field_indexes->field_index, | |
6903 | loc); | |
6904 | return cond; | |
e440a328 | 6905 | } |
6906 | ||
cd39797e | 6907 | // Flatten a method value into a struct with nil checks. We can't do |
6908 | // this in the lowering phase, because if the method value is called | |
6909 | // directly we don't need a thunk. That case will have been handled | |
6910 | // by Call_expression::do_lower, so if we get here then we do need a | |
6911 | // thunk. | |
e440a328 | 6912 | |
cd39797e | 6913 | Expression* |
6914 | Bound_method_expression::do_flatten(Gogo* gogo, Named_object*, | |
6915 | Statement_inserter* inserter) | |
e440a328 | 6916 | { |
cd39797e | 6917 | Location loc = this->location(); |
6918 | ||
6919 | Named_object* thunk = Bound_method_expression::create_thunk(gogo, | |
0afbb937 | 6920 | this->method_, |
6921 | this->function_); | |
6922 | if (thunk->is_erroneous()) | |
6923 | { | |
6924 | go_assert(saw_errors()); | |
cd39797e | 6925 | return Expression::make_error(loc); |
0afbb937 | 6926 | } |
6927 | ||
cd39797e | 6928 | // Force the expression into a variable. This is only necessary if |
6929 | // we are going to do nil checks below, but it's easy enough to | |
6930 | // always do it. | |
6931 | Expression* expr = this->expr_; | |
6932 | if (!expr->is_variable()) | |
6933 | { | |
6934 | Temporary_statement* etemp = Statement::make_temporary(NULL, expr, loc); | |
6935 | inserter->insert(etemp); | |
6936 | expr = Expression::make_temporary_reference(etemp, loc); | |
6937 | } | |
0afbb937 | 6938 | |
6939 | // If the method expects a value, and we have a pointer, we need to | |
6940 | // dereference the pointer. | |
6941 | ||
6942 | Named_object* fn = this->method_->named_object(); | |
cd39797e | 6943 | Function_type *fntype; |
0afbb937 | 6944 | if (fn->is_function()) |
6945 | fntype = fn->func_value()->type(); | |
6946 | else if (fn->is_function_declaration()) | |
6947 | fntype = fn->func_declaration_value()->type(); | |
6948 | else | |
6949 | go_unreachable(); | |
6950 | ||
cd39797e | 6951 | Expression* val = expr; |
0afbb937 | 6952 | if (fntype->receiver()->type()->points_to() == NULL |
6953 | && val->type()->points_to() != NULL) | |
6954 | val = Expression::make_unary(OPERATOR_MULT, val, loc); | |
6955 | ||
6956 | // Note that we are ignoring this->expr_type_ here. The thunk will | |
6957 | // expect a closure whose second field has type this->expr_type_ (if | |
6958 | // that is not NULL). We are going to pass it a closure whose | |
6959 | // second field has type this->expr_->type(). Since | |
6960 | // this->expr_type_ is only not-NULL for pointer types, we can get | |
6961 | // away with this. | |
6962 | ||
6963 | Struct_field_list* fields = new Struct_field_list(); | |
6964 | fields->push_back(Struct_field(Typed_identifier("fn.0", | |
6965 | thunk->func_value()->type(), | |
6966 | loc))); | |
6967 | fields->push_back(Struct_field(Typed_identifier("val.1", val->type(), loc))); | |
6968 | Struct_type* st = Type::make_struct_type(fields, loc); | |
6bf4793c | 6969 | st->set_is_struct_incomparable(); |
0afbb937 | 6970 | |
6971 | Expression_list* vals = new Expression_list(); | |
6972 | vals->push_back(Expression::make_func_code_reference(thunk, loc)); | |
6973 | vals->push_back(val); | |
6974 | ||
6975 | Expression* ret = Expression::make_struct_composite_literal(st, vals, loc); | |
0afbb937 | 6976 | |
cd39797e | 6977 | if (!gogo->compiling_runtime() || gogo->package_name() != "runtime") |
6978 | ret = Expression::make_heap_expression(ret, loc); | |
6979 | else | |
6980 | { | |
6981 | // When compiling the runtime, method closures do not escape. | |
6982 | // When escape analysis becomes the default, and applies to | |
6983 | // method closures, this should be changed to make it an error | |
6984 | // if a method closure escapes. | |
6985 | Temporary_statement* ctemp = Statement::make_temporary(st, ret, loc); | |
6986 | inserter->insert(ctemp); | |
6987 | ret = Expression::make_temporary_reference(ctemp, loc); | |
6988 | ret = Expression::make_unary(OPERATOR_AND, ret, loc); | |
6989 | ret->unary_expression()->set_does_not_escape(); | |
6990 | } | |
6991 | ||
6992 | // If necessary, check whether the expression or any embedded | |
6993 | // pointers are nil. | |
0afbb937 | 6994 | |
df7ef1fd | 6995 | Expression* nil_check = NULL; |
0afbb937 | 6996 | if (this->method_->field_indexes() != NULL) |
6997 | { | |
0afbb937 | 6998 | Expression* ref = expr; |
6999 | nil_check = bme_check_nil(this->method_->field_indexes(), loc, &ref); | |
7000 | expr = ref; | |
7001 | } | |
7002 | ||
7003 | if (this->method_->is_value_method() && expr->type()->points_to() != NULL) | |
7004 | { | |
7005 | Expression* n = Expression::make_binary(OPERATOR_EQEQ, expr, | |
7006 | Expression::make_nil(loc), | |
7007 | loc); | |
7008 | if (nil_check == NULL) | |
7009 | nil_check = n; | |
7010 | else | |
7011 | nil_check = Expression::make_binary(OPERATOR_OROR, nil_check, n, loc); | |
7012 | } | |
7013 | ||
7014 | if (nil_check != NULL) | |
7015 | { | |
cd39797e | 7016 | Expression* crash = gogo->runtime_error(RUNTIME_ERROR_NIL_DEREFERENCE, |
7017 | loc); | |
7018 | // Fix the type of the conditional expression by pretending to | |
7019 | // evaluate to RET either way through the conditional. | |
7020 | crash = Expression::make_compound(crash, ret, loc); | |
7021 | ret = Expression::make_conditional(nil_check, crash, ret, loc); | |
7022 | } | |
7023 | ||
7024 | // RET is a pointer to a struct, but we want a function type. | |
7025 | ret = Expression::make_unsafe_cast(this->type(), ret, loc); | |
7026 | ||
7027 | return ret; | |
e440a328 | 7028 | } |
7029 | ||
d751bb78 | 7030 | // Dump ast representation of a bound method expression. |
7031 | ||
7032 | void | |
7033 | Bound_method_expression::do_dump_expression(Ast_dump_context* ast_dump_context) | |
7034 | const | |
7035 | { | |
7036 | if (this->expr_type_ != NULL) | |
7037 | ast_dump_context->ostream() << "("; | |
7038 | ast_dump_context->dump_expression(this->expr_); | |
7039 | if (this->expr_type_ != NULL) | |
7040 | { | |
7041 | ast_dump_context->ostream() << ":"; | |
7042 | ast_dump_context->dump_type(this->expr_type_); | |
7043 | ast_dump_context->ostream() << ")"; | |
7044 | } | |
7045 | ||
0afbb937 | 7046 | ast_dump_context->ostream() << "." << this->function_->name(); |
d751bb78 | 7047 | } |
7048 | ||
e440a328 | 7049 | // Make a method expression. |
7050 | ||
7051 | Bound_method_expression* | |
0afbb937 | 7052 | Expression::make_bound_method(Expression* expr, const Method* method, |
7053 | Named_object* function, Location location) | |
e440a328 | 7054 | { |
0afbb937 | 7055 | return new Bound_method_expression(expr, method, function, location); |
e440a328 | 7056 | } |
7057 | ||
7058 | // Class Builtin_call_expression. This is used for a call to a | |
7059 | // builtin function. | |
7060 | ||
7061 | class Builtin_call_expression : public Call_expression | |
7062 | { | |
7063 | public: | |
7064 | Builtin_call_expression(Gogo* gogo, Expression* fn, Expression_list* args, | |
b13c66cd | 7065 | bool is_varargs, Location location); |
e440a328 | 7066 | |
7067 | protected: | |
7068 | // This overrides Call_expression::do_lower. | |
7069 | Expression* | |
ceeb4318 | 7070 | do_lower(Gogo*, Named_object*, Statement_inserter*, int); |
e440a328 | 7071 | |
35a54f17 | 7072 | Expression* |
7073 | do_flatten(Gogo*, Named_object*, Statement_inserter*); | |
7074 | ||
e440a328 | 7075 | bool |
7076 | do_is_constant() const; | |
7077 | ||
7078 | bool | |
0c77715b | 7079 | do_numeric_constant_value(Numeric_constant*) const; |
e440a328 | 7080 | |
4f2138d7 | 7081 | bool |
a7549a6a | 7082 | do_discarding_value(); |
7083 | ||
e440a328 | 7084 | Type* |
7085 | do_type(); | |
7086 | ||
7087 | void | |
7088 | do_determine_type(const Type_context*); | |
7089 | ||
7090 | void | |
7091 | do_check_types(Gogo*); | |
7092 | ||
7093 | Expression* | |
72666aed | 7094 | do_copy(); |
e440a328 | 7095 | |
ea664253 | 7096 | Bexpression* |
7097 | do_get_backend(Translate_context*); | |
e440a328 | 7098 | |
7099 | void | |
7100 | do_export(Export*) const; | |
7101 | ||
7102 | virtual bool | |
7103 | do_is_recover_call() const; | |
7104 | ||
7105 | virtual void | |
7106 | do_set_recover_arg(Expression*); | |
7107 | ||
7108 | private: | |
7109 | // The builtin functions. | |
7110 | enum Builtin_function_code | |
7111 | { | |
7112 | BUILTIN_INVALID, | |
7113 | ||
7114 | // Predeclared builtin functions. | |
7115 | BUILTIN_APPEND, | |
7116 | BUILTIN_CAP, | |
7117 | BUILTIN_CLOSE, | |
48080209 | 7118 | BUILTIN_COMPLEX, |
e440a328 | 7119 | BUILTIN_COPY, |
1cce762f | 7120 | BUILTIN_DELETE, |
e440a328 | 7121 | BUILTIN_IMAG, |
7122 | BUILTIN_LEN, | |
7123 | BUILTIN_MAKE, | |
7124 | BUILTIN_NEW, | |
7125 | BUILTIN_PANIC, | |
7126 | BUILTIN_PRINT, | |
7127 | BUILTIN_PRINTLN, | |
7128 | BUILTIN_REAL, | |
7129 | BUILTIN_RECOVER, | |
7130 | ||
7131 | // Builtin functions from the unsafe package. | |
7132 | BUILTIN_ALIGNOF, | |
7133 | BUILTIN_OFFSETOF, | |
7134 | BUILTIN_SIZEOF | |
7135 | }; | |
7136 | ||
7137 | Expression* | |
7138 | one_arg() const; | |
7139 | ||
7140 | bool | |
7141 | check_one_arg(); | |
7142 | ||
7143 | static Type* | |
7144 | real_imag_type(Type*); | |
7145 | ||
7146 | static Type* | |
48080209 | 7147 | complex_type(Type*); |
e440a328 | 7148 | |
a9182619 | 7149 | Expression* |
321e5ad2 | 7150 | lower_make(Statement_inserter*); |
7151 | ||
7152 | Expression* flatten_append(Gogo*, Named_object*, Statement_inserter*); | |
a9182619 | 7153 | |
7154 | bool | |
ccea2b36 | 7155 | check_int_value(Expression*, bool is_length, bool* small); |
a9182619 | 7156 | |
e440a328 | 7157 | // A pointer back to the general IR structure. This avoids a global |
7158 | // variable, or passing it around everywhere. | |
7159 | Gogo* gogo_; | |
7160 | // The builtin function being called. | |
7161 | Builtin_function_code code_; | |
0f914071 | 7162 | // Used to stop endless loops when the length of an array uses len |
7163 | // or cap of the array itself. | |
7164 | mutable bool seen_; | |
6334270b | 7165 | // Whether the argument is set for calls to BUILTIN_RECOVER. |
7166 | bool recover_arg_is_set_; | |
e440a328 | 7167 | }; |
7168 | ||
7169 | Builtin_call_expression::Builtin_call_expression(Gogo* gogo, | |
7170 | Expression* fn, | |
7171 | Expression_list* args, | |
7172 | bool is_varargs, | |
b13c66cd | 7173 | Location location) |
e440a328 | 7174 | : Call_expression(fn, args, is_varargs, location), |
6334270b | 7175 | gogo_(gogo), code_(BUILTIN_INVALID), seen_(false), |
7176 | recover_arg_is_set_(false) | |
e440a328 | 7177 | { |
7178 | Func_expression* fnexp = this->fn()->func_expression(); | |
79651b1f | 7179 | if (fnexp == NULL) |
7180 | { | |
7181 | this->code_ = BUILTIN_INVALID; | |
7182 | return; | |
7183 | } | |
e440a328 | 7184 | const std::string& name(fnexp->named_object()->name()); |
7185 | if (name == "append") | |
7186 | this->code_ = BUILTIN_APPEND; | |
7187 | else if (name == "cap") | |
7188 | this->code_ = BUILTIN_CAP; | |
7189 | else if (name == "close") | |
7190 | this->code_ = BUILTIN_CLOSE; | |
48080209 | 7191 | else if (name == "complex") |
7192 | this->code_ = BUILTIN_COMPLEX; | |
e440a328 | 7193 | else if (name == "copy") |
7194 | this->code_ = BUILTIN_COPY; | |
1cce762f | 7195 | else if (name == "delete") |
7196 | this->code_ = BUILTIN_DELETE; | |
e440a328 | 7197 | else if (name == "imag") |
7198 | this->code_ = BUILTIN_IMAG; | |
7199 | else if (name == "len") | |
7200 | this->code_ = BUILTIN_LEN; | |
7201 | else if (name == "make") | |
7202 | this->code_ = BUILTIN_MAKE; | |
7203 | else if (name == "new") | |
7204 | this->code_ = BUILTIN_NEW; | |
7205 | else if (name == "panic") | |
7206 | this->code_ = BUILTIN_PANIC; | |
7207 | else if (name == "print") | |
7208 | this->code_ = BUILTIN_PRINT; | |
7209 | else if (name == "println") | |
7210 | this->code_ = BUILTIN_PRINTLN; | |
7211 | else if (name == "real") | |
7212 | this->code_ = BUILTIN_REAL; | |
7213 | else if (name == "recover") | |
7214 | this->code_ = BUILTIN_RECOVER; | |
7215 | else if (name == "Alignof") | |
7216 | this->code_ = BUILTIN_ALIGNOF; | |
7217 | else if (name == "Offsetof") | |
7218 | this->code_ = BUILTIN_OFFSETOF; | |
7219 | else if (name == "Sizeof") | |
7220 | this->code_ = BUILTIN_SIZEOF; | |
7221 | else | |
c3e6f413 | 7222 | go_unreachable(); |
e440a328 | 7223 | } |
7224 | ||
7225 | // Return whether this is a call to recover. This is a virtual | |
7226 | // function called from the parent class. | |
7227 | ||
7228 | bool | |
7229 | Builtin_call_expression::do_is_recover_call() const | |
7230 | { | |
7231 | if (this->classification() == EXPRESSION_ERROR) | |
7232 | return false; | |
7233 | return this->code_ == BUILTIN_RECOVER; | |
7234 | } | |
7235 | ||
7236 | // Set the argument for a call to recover. | |
7237 | ||
7238 | void | |
7239 | Builtin_call_expression::do_set_recover_arg(Expression* arg) | |
7240 | { | |
7241 | const Expression_list* args = this->args(); | |
c484d925 | 7242 | go_assert(args == NULL || args->empty()); |
e440a328 | 7243 | Expression_list* new_args = new Expression_list(); |
7244 | new_args->push_back(arg); | |
7245 | this->set_args(new_args); | |
6334270b | 7246 | this->recover_arg_is_set_ = true; |
e440a328 | 7247 | } |
7248 | ||
e440a328 | 7249 | // Lower a builtin call expression. This turns new and make into |
7250 | // specific expressions. We also convert to a constant if we can. | |
7251 | ||
7252 | Expression* | |
321e5ad2 | 7253 | Builtin_call_expression::do_lower(Gogo*, Named_object* function, |
ceeb4318 | 7254 | Statement_inserter* inserter, int) |
e440a328 | 7255 | { |
79651b1f | 7256 | if (this->is_error_expression()) |
a9182619 | 7257 | return this; |
7258 | ||
b13c66cd | 7259 | Location loc = this->location(); |
1cce762f | 7260 | |
a8725655 | 7261 | if (this->is_varargs() && this->code_ != BUILTIN_APPEND) |
7262 | { | |
7263 | this->report_error(_("invalid use of %<...%> with builtin function")); | |
1cce762f | 7264 | return Expression::make_error(loc); |
a8725655 | 7265 | } |
7266 | ||
393ba00b | 7267 | if (this->code_ == BUILTIN_OFFSETOF) |
7268 | { | |
7269 | Expression* arg = this->one_arg(); | |
12e69faa | 7270 | |
7271 | if (arg->bound_method_expression() != NULL | |
7272 | || arg->interface_field_reference_expression() != NULL) | |
7273 | { | |
7274 | this->report_error(_("invalid use of method value as argument " | |
7275 | "of Offsetof")); | |
7276 | return this; | |
7277 | } | |
7278 | ||
393ba00b | 7279 | Field_reference_expression* farg = arg->field_reference_expression(); |
7280 | while (farg != NULL) | |
7281 | { | |
7282 | if (!farg->implicit()) | |
7283 | break; | |
7284 | // When the selector refers to an embedded field, | |
7285 | // it must not be reached through pointer indirections. | |
7286 | if (farg->expr()->deref() != farg->expr()) | |
7287 | { | |
12e69faa | 7288 | this->report_error(_("argument of Offsetof implies " |
7289 | "indirection of an embedded field")); | |
393ba00b | 7290 | return this; |
7291 | } | |
7292 | // Go up until we reach the original base. | |
7293 | farg = farg->expr()->field_reference_expression(); | |
7294 | } | |
7295 | } | |
7296 | ||
1cce762f | 7297 | if (this->is_constant()) |
e440a328 | 7298 | { |
0c77715b | 7299 | Numeric_constant nc; |
7300 | if (this->numeric_constant_value(&nc)) | |
7301 | return nc.expression(loc); | |
e440a328 | 7302 | } |
1cce762f | 7303 | |
7304 | switch (this->code_) | |
e440a328 | 7305 | { |
1cce762f | 7306 | default: |
7307 | break; | |
7308 | ||
7309 | case BUILTIN_NEW: | |
7310 | { | |
7311 | const Expression_list* args = this->args(); | |
7312 | if (args == NULL || args->size() < 1) | |
7313 | this->report_error(_("not enough arguments")); | |
7314 | else if (args->size() > 1) | |
7315 | this->report_error(_("too many arguments")); | |
7316 | else | |
7317 | { | |
7318 | Expression* arg = args->front(); | |
7319 | if (!arg->is_type_expression()) | |
7320 | { | |
631d5788 | 7321 | go_error_at(arg->location(), "expected type"); |
1cce762f | 7322 | this->set_is_error(); |
7323 | } | |
7324 | else | |
7325 | return Expression::make_allocation(arg->type(), loc); | |
7326 | } | |
7327 | } | |
7328 | break; | |
7329 | ||
7330 | case BUILTIN_MAKE: | |
321e5ad2 | 7331 | return this->lower_make(inserter); |
1cce762f | 7332 | |
7333 | case BUILTIN_RECOVER: | |
e440a328 | 7334 | if (function != NULL) |
7335 | function->func_value()->set_calls_recover(); | |
7336 | else | |
7337 | { | |
7338 | // Calling recover outside of a function always returns the | |
7339 | // nil empty interface. | |
823c7e3d | 7340 | Type* eface = Type::make_empty_interface_type(loc); |
1cce762f | 7341 | return Expression::make_cast(eface, Expression::make_nil(loc), loc); |
e440a328 | 7342 | } |
1cce762f | 7343 | break; |
7344 | ||
1cce762f | 7345 | case BUILTIN_DELETE: |
7346 | { | |
7347 | // Lower to a runtime function call. | |
7348 | const Expression_list* args = this->args(); | |
7349 | if (args == NULL || args->size() < 2) | |
7350 | this->report_error(_("not enough arguments")); | |
7351 | else if (args->size() > 2) | |
7352 | this->report_error(_("too many arguments")); | |
7353 | else if (args->front()->type()->map_type() == NULL) | |
7354 | this->report_error(_("argument 1 must be a map")); | |
7355 | else | |
7356 | { | |
7357 | // Since this function returns no value it must appear in | |
7358 | // a statement by itself, so we don't have to worry about | |
7359 | // order of evaluation of values around it. Evaluate the | |
7360 | // map first to get order of evaluation right. | |
7361 | Map_type* mt = args->front()->type()->map_type(); | |
7362 | Temporary_statement* map_temp = | |
7363 | Statement::make_temporary(mt, args->front(), loc); | |
7364 | inserter->insert(map_temp); | |
7365 | ||
7366 | Temporary_statement* key_temp = | |
7367 | Statement::make_temporary(mt->key_type(), args->back(), loc); | |
7368 | inserter->insert(key_temp); | |
7369 | ||
0d5530d9 | 7370 | Expression* e1 = Expression::make_type_descriptor(mt, loc); |
7371 | Expression* e2 = Expression::make_temporary_reference(map_temp, | |
1cce762f | 7372 | loc); |
0d5530d9 | 7373 | Expression* e3 = Expression::make_temporary_reference(key_temp, |
1cce762f | 7374 | loc); |
0d5530d9 | 7375 | e3 = Expression::make_unary(OPERATOR_AND, e3, loc); |
1cce762f | 7376 | return Runtime::make_call(Runtime::MAPDELETE, this->location(), |
0d5530d9 | 7377 | 3, e1, e2, e3); |
1cce762f | 7378 | } |
7379 | } | |
7380 | break; | |
88b03a70 | 7381 | |
7382 | case BUILTIN_PRINT: | |
7383 | case BUILTIN_PRINTLN: | |
7384 | // Force all the arguments into temporary variables, so that we | |
7385 | // don't try to evaluate something while holding the print lock. | |
7386 | if (this->args() == NULL) | |
7387 | break; | |
7388 | for (Expression_list::iterator pa = this->args()->begin(); | |
7389 | pa != this->args()->end(); | |
7390 | ++pa) | |
7391 | { | |
493ce3ee | 7392 | if (!(*pa)->is_variable() && !(*pa)->is_constant()) |
88b03a70 | 7393 | { |
7394 | Temporary_statement* temp = | |
7395 | Statement::make_temporary(NULL, *pa, loc); | |
7396 | inserter->insert(temp); | |
7397 | *pa = Expression::make_temporary_reference(temp, loc); | |
7398 | } | |
7399 | } | |
7400 | break; | |
e440a328 | 7401 | } |
7402 | ||
7403 | return this; | |
7404 | } | |
7405 | ||
35a54f17 | 7406 | // Flatten a builtin call expression. This turns the arguments of copy and |
7407 | // append into temporary expressions. | |
7408 | ||
7409 | Expression* | |
321e5ad2 | 7410 | Builtin_call_expression::do_flatten(Gogo* gogo, Named_object* function, |
35a54f17 | 7411 | Statement_inserter* inserter) |
7412 | { | |
16cb7fec | 7413 | Location loc = this->location(); |
7414 | ||
7415 | switch (this->code_) | |
35a54f17 | 7416 | { |
16cb7fec | 7417 | default: |
7418 | break; | |
7419 | ||
7420 | case BUILTIN_APPEND: | |
321e5ad2 | 7421 | return this->flatten_append(gogo, function, inserter); |
7422 | ||
16cb7fec | 7423 | case BUILTIN_COPY: |
7424 | { | |
7425 | Type* at = this->args()->front()->type(); | |
7426 | for (Expression_list::iterator pa = this->args()->begin(); | |
7427 | pa != this->args()->end(); | |
7428 | ++pa) | |
7429 | { | |
7430 | if ((*pa)->is_nil_expression()) | |
7431 | { | |
7432 | Expression* nil = Expression::make_nil(loc); | |
7433 | Expression* zero = Expression::make_integer_ul(0, NULL, loc); | |
7434 | *pa = Expression::make_slice_value(at, nil, zero, zero, loc); | |
7435 | } | |
7436 | if (!(*pa)->is_variable()) | |
7437 | { | |
7438 | Temporary_statement* temp = | |
7439 | Statement::make_temporary(NULL, *pa, loc); | |
7440 | inserter->insert(temp); | |
7441 | *pa = Expression::make_temporary_reference(temp, loc); | |
7442 | } | |
7443 | } | |
7444 | } | |
7445 | break; | |
7446 | ||
7447 | case BUILTIN_PANIC: | |
35a54f17 | 7448 | for (Expression_list::iterator pa = this->args()->begin(); |
16cb7fec | 7449 | pa != this->args()->end(); |
7450 | ++pa) | |
7451 | { | |
7452 | if (!(*pa)->is_variable() && (*pa)->type()->interface_type() != NULL) | |
55e8ba6a | 7453 | { |
16cb7fec | 7454 | Temporary_statement* temp = |
7455 | Statement::make_temporary(NULL, *pa, loc); | |
7456 | inserter->insert(temp); | |
7457 | *pa = Expression::make_temporary_reference(temp, loc); | |
55e8ba6a | 7458 | } |
16cb7fec | 7459 | } |
7739537f | 7460 | break; |
0d5530d9 | 7461 | |
7462 | case BUILTIN_LEN: | |
132ed071 | 7463 | case BUILTIN_CAP: |
321e5ad2 | 7464 | { |
7465 | Expression_list::iterator pa = this->args()->begin(); | |
7466 | if (!(*pa)->is_variable() | |
7467 | && ((*pa)->type()->map_type() != NULL | |
7468 | || (*pa)->type()->channel_type() != NULL)) | |
7469 | { | |
7470 | Temporary_statement* temp = | |
7471 | Statement::make_temporary(NULL, *pa, loc); | |
7472 | inserter->insert(temp); | |
7473 | *pa = Expression::make_temporary_reference(temp, loc); | |
7474 | } | |
7475 | } | |
7476 | break; | |
35a54f17 | 7477 | } |
16cb7fec | 7478 | |
35a54f17 | 7479 | return this; |
7480 | } | |
7481 | ||
a9182619 | 7482 | // Lower a make expression. |
7483 | ||
7484 | Expression* | |
321e5ad2 | 7485 | Builtin_call_expression::lower_make(Statement_inserter* inserter) |
a9182619 | 7486 | { |
b13c66cd | 7487 | Location loc = this->location(); |
a9182619 | 7488 | |
7489 | const Expression_list* args = this->args(); | |
7490 | if (args == NULL || args->size() < 1) | |
7491 | { | |
7492 | this->report_error(_("not enough arguments")); | |
7493 | return Expression::make_error(this->location()); | |
7494 | } | |
7495 | ||
7496 | Expression_list::const_iterator parg = args->begin(); | |
7497 | ||
7498 | Expression* first_arg = *parg; | |
7499 | if (!first_arg->is_type_expression()) | |
7500 | { | |
631d5788 | 7501 | go_error_at(first_arg->location(), "expected type"); |
a9182619 | 7502 | this->set_is_error(); |
7503 | return Expression::make_error(this->location()); | |
7504 | } | |
7505 | Type* type = first_arg->type(); | |
7506 | ||
22deed0d | 7507 | if (!type->in_heap()) |
7508 | go_error_at(first_arg->location(), | |
7509 | "can't make slice of go:notinheap type"); | |
7510 | ||
a9182619 | 7511 | bool is_slice = false; |
7512 | bool is_map = false; | |
7513 | bool is_chan = false; | |
411eb89e | 7514 | if (type->is_slice_type()) |
a9182619 | 7515 | is_slice = true; |
7516 | else if (type->map_type() != NULL) | |
7517 | is_map = true; | |
7518 | else if (type->channel_type() != NULL) | |
7519 | is_chan = true; | |
7520 | else | |
7521 | { | |
7522 | this->report_error(_("invalid type for make function")); | |
7523 | return Expression::make_error(this->location()); | |
7524 | } | |
7525 | ||
f6bc81e6 | 7526 | Type_context int_context(Type::lookup_integer_type("int"), false); |
7527 | ||
a9182619 | 7528 | ++parg; |
7529 | Expression* len_arg; | |
ccea2b36 | 7530 | bool len_small = false; |
a9182619 | 7531 | if (parg == args->end()) |
7532 | { | |
7533 | if (is_slice) | |
7534 | { | |
7535 | this->report_error(_("length required when allocating a slice")); | |
7536 | return Expression::make_error(this->location()); | |
7537 | } | |
e67508fa | 7538 | len_arg = Expression::make_integer_ul(0, NULL, loc); |
a9182619 | 7539 | } |
7540 | else | |
7541 | { | |
7542 | len_arg = *parg; | |
f6bc81e6 | 7543 | len_arg->determine_type(&int_context); |
ccea2b36 | 7544 | if (!this->check_int_value(len_arg, true, &len_small)) |
1ad00fd4 | 7545 | return Expression::make_error(this->location()); |
a9182619 | 7546 | ++parg; |
7547 | } | |
7548 | ||
7549 | Expression* cap_arg = NULL; | |
ccea2b36 | 7550 | bool cap_small = false; |
a9182619 | 7551 | if (is_slice && parg != args->end()) |
7552 | { | |
7553 | cap_arg = *parg; | |
f6bc81e6 | 7554 | cap_arg->determine_type(&int_context); |
ccea2b36 | 7555 | if (!this->check_int_value(cap_arg, false, &cap_small)) |
1ad00fd4 | 7556 | return Expression::make_error(this->location()); |
7557 | ||
7558 | Numeric_constant nclen; | |
7559 | Numeric_constant nccap; | |
7560 | unsigned long vlen; | |
7561 | unsigned long vcap; | |
7562 | if (len_arg->numeric_constant_value(&nclen) | |
7563 | && cap_arg->numeric_constant_value(&nccap) | |
7564 | && nclen.to_unsigned_long(&vlen) == Numeric_constant::NC_UL_VALID | |
7565 | && nccap.to_unsigned_long(&vcap) == Numeric_constant::NC_UL_VALID | |
7566 | && vlen > vcap) | |
a9182619 | 7567 | { |
1ad00fd4 | 7568 | this->report_error(_("len larger than cap")); |
a9182619 | 7569 | return Expression::make_error(this->location()); |
7570 | } | |
1ad00fd4 | 7571 | |
a9182619 | 7572 | ++parg; |
7573 | } | |
7574 | ||
7575 | if (parg != args->end()) | |
7576 | { | |
7577 | this->report_error(_("too many arguments to make")); | |
7578 | return Expression::make_error(this->location()); | |
7579 | } | |
7580 | ||
b13c66cd | 7581 | Location type_loc = first_arg->location(); |
a9182619 | 7582 | |
7583 | Expression* call; | |
7584 | if (is_slice) | |
7585 | { | |
321e5ad2 | 7586 | Type* et = type->array_type()->element_type(); |
7587 | Expression* type_arg = Expression::make_type_descriptor(et, type_loc); | |
a9182619 | 7588 | if (cap_arg == NULL) |
321e5ad2 | 7589 | { |
7590 | Temporary_statement* temp = Statement::make_temporary(NULL, | |
7591 | len_arg, | |
7592 | loc); | |
7593 | inserter->insert(temp); | |
7594 | len_arg = Expression::make_temporary_reference(temp, loc); | |
7595 | cap_arg = Expression::make_temporary_reference(temp, loc); | |
ccea2b36 | 7596 | cap_small = len_small; |
321e5ad2 | 7597 | } |
ccea2b36 | 7598 | |
7599 | Runtime::Function code = Runtime::MAKESLICE; | |
7600 | if (!len_small || !cap_small) | |
7601 | code = Runtime::MAKESLICE64; | |
7602 | call = Runtime::make_call(code, loc, 3, type_arg, len_arg, cap_arg); | |
a9182619 | 7603 | } |
7604 | else if (is_map) | |
321e5ad2 | 7605 | { |
7606 | Expression* type_arg = Expression::make_type_descriptor(type, type_loc); | |
7607 | call = Runtime::make_call(Runtime::MAKEMAP, loc, 4, type_arg, len_arg, | |
7608 | Expression::make_nil(loc), | |
7609 | Expression::make_nil(loc)); | |
7610 | } | |
a9182619 | 7611 | else if (is_chan) |
321e5ad2 | 7612 | { |
7613 | Expression* type_arg = Expression::make_type_descriptor(type, type_loc); | |
7614 | call = Runtime::make_call(Runtime::MAKECHAN, loc, 2, type_arg, len_arg); | |
7615 | } | |
a9182619 | 7616 | else |
7617 | go_unreachable(); | |
7618 | ||
7619 | return Expression::make_unsafe_cast(type, call, loc); | |
7620 | } | |
7621 | ||
321e5ad2 | 7622 | // Flatten a call to the predeclared append function. We do this in |
7623 | // the flatten phase, not the lowering phase, so that we run after | |
7624 | // type checking and after order_evaluations. | |
7625 | ||
7626 | Expression* | |
7627 | Builtin_call_expression::flatten_append(Gogo* gogo, Named_object* function, | |
7628 | Statement_inserter* inserter) | |
7629 | { | |
7630 | if (this->is_error_expression()) | |
7631 | return this; | |
7632 | ||
7633 | Location loc = this->location(); | |
7634 | ||
7635 | const Expression_list* args = this->args(); | |
7636 | go_assert(args != NULL && !args->empty()); | |
7637 | ||
7638 | Type* slice_type = args->front()->type(); | |
7639 | go_assert(slice_type->is_slice_type()); | |
7640 | Type* element_type = slice_type->array_type()->element_type(); | |
7641 | ||
7642 | if (args->size() == 1) | |
7643 | { | |
7644 | // append(s) evaluates to s. | |
7645 | return args->front(); | |
7646 | } | |
7647 | ||
7648 | Type* int_type = Type::lookup_integer_type("int"); | |
7649 | Type* uint_type = Type::lookup_integer_type("uint"); | |
7650 | ||
7651 | // Implementing | |
7652 | // append(s1, s2...) | |
7653 | // or | |
7654 | // append(s1, a1, a2, a3, ...) | |
7655 | ||
7656 | // s1tmp := s1 | |
7657 | Temporary_statement* s1tmp = Statement::make_temporary(NULL, args->front(), | |
7658 | loc); | |
7659 | inserter->insert(s1tmp); | |
7660 | ||
7661 | // l1tmp := len(s1tmp) | |
7662 | Named_object* lenfn = gogo->lookup_global("len"); | |
7663 | Expression* lenref = Expression::make_func_reference(lenfn, NULL, loc); | |
7664 | Expression_list* call_args = new Expression_list(); | |
7665 | call_args->push_back(Expression::make_temporary_reference(s1tmp, loc)); | |
7666 | Expression* len = Expression::make_call(lenref, call_args, false, loc); | |
7667 | gogo->lower_expression(function, inserter, &len); | |
7668 | gogo->flatten_expression(function, inserter, &len); | |
7669 | Temporary_statement* l1tmp = Statement::make_temporary(int_type, len, loc); | |
7670 | inserter->insert(l1tmp); | |
7671 | ||
7672 | Temporary_statement* s2tmp = NULL; | |
7673 | Temporary_statement* l2tmp = NULL; | |
7674 | Expression_list* add = NULL; | |
7675 | Expression* len2; | |
7676 | if (this->is_varargs()) | |
7677 | { | |
7678 | go_assert(args->size() == 2); | |
7679 | ||
7680 | // s2tmp := s2 | |
7681 | s2tmp = Statement::make_temporary(NULL, args->back(), loc); | |
7682 | inserter->insert(s2tmp); | |
7683 | ||
7684 | // l2tmp := len(s2tmp) | |
7685 | lenref = Expression::make_func_reference(lenfn, NULL, loc); | |
7686 | call_args = new Expression_list(); | |
7687 | call_args->push_back(Expression::make_temporary_reference(s2tmp, loc)); | |
7688 | len = Expression::make_call(lenref, call_args, false, loc); | |
7689 | gogo->lower_expression(function, inserter, &len); | |
7690 | gogo->flatten_expression(function, inserter, &len); | |
7691 | l2tmp = Statement::make_temporary(int_type, len, loc); | |
7692 | inserter->insert(l2tmp); | |
7693 | ||
7694 | // len2 = l2tmp | |
7695 | len2 = Expression::make_temporary_reference(l2tmp, loc); | |
7696 | } | |
7697 | else | |
7698 | { | |
7699 | // We have to ensure that all the arguments are in variables | |
7700 | // now, because otherwise if one of them is an index expression | |
7701 | // into the current slice we could overwrite it before we fetch | |
7702 | // it. | |
7703 | add = new Expression_list(); | |
7704 | Expression_list::const_iterator pa = args->begin(); | |
7705 | for (++pa; pa != args->end(); ++pa) | |
7706 | { | |
7707 | if ((*pa)->is_variable()) | |
7708 | add->push_back(*pa); | |
7709 | else | |
7710 | { | |
7711 | Temporary_statement* tmp = Statement::make_temporary(NULL, *pa, | |
7712 | loc); | |
7713 | inserter->insert(tmp); | |
7714 | add->push_back(Expression::make_temporary_reference(tmp, loc)); | |
7715 | } | |
7716 | } | |
7717 | ||
7718 | // len2 = len(add) | |
7719 | len2 = Expression::make_integer_ul(add->size(), int_type, loc); | |
7720 | } | |
7721 | ||
7722 | // ntmp := l1tmp + len2 | |
7723 | Expression* ref = Expression::make_temporary_reference(l1tmp, loc); | |
7724 | Expression* sum = Expression::make_binary(OPERATOR_PLUS, ref, len2, loc); | |
7725 | gogo->lower_expression(function, inserter, &sum); | |
7726 | gogo->flatten_expression(function, inserter, &sum); | |
7727 | Temporary_statement* ntmp = Statement::make_temporary(int_type, sum, loc); | |
7728 | inserter->insert(ntmp); | |
7729 | ||
7730 | // s1tmp = uint(ntmp) > uint(cap(s1tmp)) ? | |
7731 | // growslice(type, s1tmp, ntmp) : | |
7732 | // s1tmp[:ntmp] | |
7733 | // Using uint here means that if the computation of ntmp overflowed, | |
7734 | // we will call growslice which will panic. | |
7735 | ||
7736 | Expression* left = Expression::make_temporary_reference(ntmp, loc); | |
7737 | left = Expression::make_cast(uint_type, left, loc); | |
7738 | ||
7739 | Named_object* capfn = gogo->lookup_global("cap"); | |
7740 | Expression* capref = Expression::make_func_reference(capfn, NULL, loc); | |
7741 | call_args = new Expression_list(); | |
7742 | call_args->push_back(Expression::make_temporary_reference(s1tmp, loc)); | |
7743 | Expression* right = Expression::make_call(capref, call_args, false, loc); | |
7744 | right = Expression::make_cast(uint_type, right, loc); | |
7745 | ||
7746 | Expression* cond = Expression::make_binary(OPERATOR_GT, left, right, loc); | |
7747 | ||
7748 | Expression* a1 = Expression::make_type_descriptor(element_type, loc); | |
7749 | Expression* a2 = Expression::make_temporary_reference(s1tmp, loc); | |
7750 | Expression* a3 = Expression::make_temporary_reference(ntmp, loc); | |
7751 | Expression* call = Runtime::make_call(Runtime::GROWSLICE, loc, 3, | |
7752 | a1, a2, a3); | |
7753 | call = Expression::make_unsafe_cast(slice_type, call, loc); | |
7754 | ||
7755 | ref = Expression::make_temporary_reference(s1tmp, loc); | |
7756 | Expression* zero = Expression::make_integer_ul(0, int_type, loc); | |
7757 | Expression* ref2 = Expression::make_temporary_reference(ntmp, loc); | |
7758 | // FIXME: Mark this index as not requiring bounds checks. | |
7759 | ref = Expression::make_index(ref, zero, ref2, NULL, loc); | |
7760 | ||
7761 | Expression* rhs = Expression::make_conditional(cond, call, ref, loc); | |
7762 | ||
7763 | gogo->lower_expression(function, inserter, &rhs); | |
7764 | gogo->flatten_expression(function, inserter, &rhs); | |
7765 | ||
7766 | Expression* lhs = Expression::make_temporary_reference(s1tmp, loc); | |
7767 | Statement* assign = Statement::make_assignment(lhs, rhs, loc); | |
7768 | inserter->insert(assign); | |
7769 | ||
7770 | if (this->is_varargs()) | |
7771 | { | |
7772 | // copy(s1tmp[l1tmp:], s2tmp) | |
7773 | a1 = Expression::make_temporary_reference(s1tmp, loc); | |
7774 | ref = Expression::make_temporary_reference(l1tmp, loc); | |
7775 | Expression* nil = Expression::make_nil(loc); | |
7776 | // FIXME: Mark this index as not requiring bounds checks. | |
7777 | a1 = Expression::make_index(a1, ref, nil, NULL, loc); | |
7778 | ||
7779 | a2 = Expression::make_temporary_reference(s2tmp, loc); | |
7780 | ||
7781 | Named_object* copyfn = gogo->lookup_global("copy"); | |
7782 | Expression* copyref = Expression::make_func_reference(copyfn, NULL, loc); | |
7783 | call_args = new Expression_list(); | |
7784 | call_args->push_back(a1); | |
7785 | call_args->push_back(a2); | |
7786 | call = Expression::make_call(copyref, call_args, false, loc); | |
7787 | gogo->lower_expression(function, inserter, &call); | |
7788 | gogo->flatten_expression(function, inserter, &call); | |
7789 | inserter->insert(Statement::make_statement(call, false)); | |
7790 | } | |
7791 | else | |
7792 | { | |
7793 | // For each argument: | |
7794 | // s1tmp[l1tmp+i] = a | |
7795 | unsigned long i = 0; | |
7796 | for (Expression_list::const_iterator pa = add->begin(); | |
7797 | pa != add->end(); | |
7798 | ++pa, ++i) | |
7799 | { | |
7800 | ref = Expression::make_temporary_reference(s1tmp, loc); | |
7801 | ref2 = Expression::make_temporary_reference(l1tmp, loc); | |
7802 | Expression* off = Expression::make_integer_ul(i, int_type, loc); | |
7803 | ref2 = Expression::make_binary(OPERATOR_PLUS, ref2, off, loc); | |
7804 | // FIXME: Mark this index as not requiring bounds checks. | |
7805 | lhs = Expression::make_index(ref, ref2, NULL, NULL, loc); | |
7806 | gogo->lower_expression(function, inserter, &lhs); | |
7807 | gogo->flatten_expression(function, inserter, &lhs); | |
03118c21 | 7808 | // The flatten pass runs after the write barrier pass, so we |
7809 | // need to insert a write barrier here if necessary. | |
7810 | if (!gogo->assign_needs_write_barrier(lhs)) | |
7811 | assign = Statement::make_assignment(lhs, *pa, loc); | |
7812 | else | |
7813 | { | |
7814 | Function* f = function == NULL ? NULL : function->func_value(); | |
7815 | assign = gogo->assign_with_write_barrier(f, NULL, inserter, | |
7816 | lhs, *pa, loc); | |
7817 | } | |
321e5ad2 | 7818 | inserter->insert(assign); |
7819 | } | |
7820 | } | |
7821 | ||
7822 | return Expression::make_temporary_reference(s1tmp, loc); | |
7823 | } | |
7824 | ||
a9182619 | 7825 | // Return whether an expression has an integer value. Report an error |
7826 | // if not. This is used when handling calls to the predeclared make | |
ccea2b36 | 7827 | // function. Set *SMALL if the value is known to fit in type "int". |
a9182619 | 7828 | |
7829 | bool | |
ccea2b36 | 7830 | Builtin_call_expression::check_int_value(Expression* e, bool is_length, |
7831 | bool *small) | |
a9182619 | 7832 | { |
ccea2b36 | 7833 | *small = false; |
7834 | ||
0c77715b | 7835 | Numeric_constant nc; |
1ad00fd4 | 7836 | if (e->numeric_constant_value(&nc)) |
a9182619 | 7837 | { |
1ad00fd4 | 7838 | unsigned long v; |
7839 | switch (nc.to_unsigned_long(&v)) | |
7840 | { | |
7841 | case Numeric_constant::NC_UL_VALID: | |
1b10c5e7 | 7842 | break; |
1ad00fd4 | 7843 | case Numeric_constant::NC_UL_NOTINT: |
631d5788 | 7844 | go_error_at(e->location(), "non-integer %s argument to make", |
7845 | is_length ? "len" : "cap"); | |
1ad00fd4 | 7846 | return false; |
7847 | case Numeric_constant::NC_UL_NEGATIVE: | |
631d5788 | 7848 | go_error_at(e->location(), "negative %s argument to make", |
7849 | is_length ? "len" : "cap"); | |
1ad00fd4 | 7850 | return false; |
7851 | case Numeric_constant::NC_UL_BIG: | |
7852 | // We don't want to give a compile-time error for a 64-bit | |
7853 | // value on a 32-bit target. | |
1b10c5e7 | 7854 | break; |
1ad00fd4 | 7855 | } |
1b10c5e7 | 7856 | |
7857 | mpz_t val; | |
7858 | if (!nc.to_int(&val)) | |
7859 | go_unreachable(); | |
7860 | int bits = mpz_sizeinbase(val, 2); | |
7861 | mpz_clear(val); | |
7862 | Type* int_type = Type::lookup_integer_type("int"); | |
7863 | if (bits >= int_type->integer_type()->bits()) | |
7864 | { | |
631d5788 | 7865 | go_error_at(e->location(), "%s argument too large for make", |
7866 | is_length ? "len" : "cap"); | |
1b10c5e7 | 7867 | return false; |
7868 | } | |
7869 | ||
ccea2b36 | 7870 | *small = true; |
1b10c5e7 | 7871 | return true; |
a9182619 | 7872 | } |
7873 | ||
1ad00fd4 | 7874 | if (e->type()->integer_type() != NULL) |
ccea2b36 | 7875 | { |
7876 | int ebits = e->type()->integer_type()->bits(); | |
7877 | int intbits = Type::lookup_integer_type("int")->integer_type()->bits(); | |
7878 | ||
7879 | // We can treat ebits == intbits as small even for an unsigned | |
7880 | // integer type, because we will convert the value to int and | |
7881 | // then reject it in the runtime if it is negative. | |
7882 | *small = ebits <= intbits; | |
7883 | ||
7884 | return true; | |
7885 | } | |
1ad00fd4 | 7886 | |
631d5788 | 7887 | go_error_at(e->location(), "non-integer %s argument to make", |
7888 | is_length ? "len" : "cap"); | |
a9182619 | 7889 | return false; |
7890 | } | |
7891 | ||
e440a328 | 7892 | // Return the type of the real or imag functions, given the type of |
fcbea5e4 | 7893 | // the argument. We need to map complex64 to float32 and complex128 |
7894 | // to float64, so it has to be done by name. This returns NULL if it | |
7895 | // can't figure out the type. | |
e440a328 | 7896 | |
7897 | Type* | |
7898 | Builtin_call_expression::real_imag_type(Type* arg_type) | |
7899 | { | |
7900 | if (arg_type == NULL || arg_type->is_abstract()) | |
7901 | return NULL; | |
7902 | Named_type* nt = arg_type->named_type(); | |
7903 | if (nt == NULL) | |
7904 | return NULL; | |
7905 | while (nt->real_type()->named_type() != NULL) | |
7906 | nt = nt->real_type()->named_type(); | |
48080209 | 7907 | if (nt->name() == "complex64") |
e440a328 | 7908 | return Type::lookup_float_type("float32"); |
7909 | else if (nt->name() == "complex128") | |
7910 | return Type::lookup_float_type("float64"); | |
7911 | else | |
7912 | return NULL; | |
7913 | } | |
7914 | ||
48080209 | 7915 | // Return the type of the complex function, given the type of one of the |
e440a328 | 7916 | // argments. Like real_imag_type, we have to map by name. |
7917 | ||
7918 | Type* | |
48080209 | 7919 | Builtin_call_expression::complex_type(Type* arg_type) |
e440a328 | 7920 | { |
7921 | if (arg_type == NULL || arg_type->is_abstract()) | |
7922 | return NULL; | |
7923 | Named_type* nt = arg_type->named_type(); | |
7924 | if (nt == NULL) | |
7925 | return NULL; | |
7926 | while (nt->real_type()->named_type() != NULL) | |
7927 | nt = nt->real_type()->named_type(); | |
48080209 | 7928 | if (nt->name() == "float32") |
e440a328 | 7929 | return Type::lookup_complex_type("complex64"); |
7930 | else if (nt->name() == "float64") | |
7931 | return Type::lookup_complex_type("complex128"); | |
7932 | else | |
7933 | return NULL; | |
7934 | } | |
7935 | ||
7936 | // Return a single argument, or NULL if there isn't one. | |
7937 | ||
7938 | Expression* | |
7939 | Builtin_call_expression::one_arg() const | |
7940 | { | |
7941 | const Expression_list* args = this->args(); | |
aa615cb3 | 7942 | if (args == NULL || args->size() != 1) |
e440a328 | 7943 | return NULL; |
7944 | return args->front(); | |
7945 | } | |
7946 | ||
83921647 | 7947 | // A traversal class which looks for a call or receive expression. |
7948 | ||
7949 | class Find_call_expression : public Traverse | |
7950 | { | |
7951 | public: | |
7952 | Find_call_expression() | |
7953 | : Traverse(traverse_expressions), | |
7954 | found_(false) | |
7955 | { } | |
7956 | ||
7957 | int | |
7958 | expression(Expression**); | |
7959 | ||
7960 | bool | |
7961 | found() | |
7962 | { return this->found_; } | |
7963 | ||
7964 | private: | |
7965 | bool found_; | |
7966 | }; | |
7967 | ||
7968 | int | |
7969 | Find_call_expression::expression(Expression** pexpr) | |
7970 | { | |
7971 | if ((*pexpr)->call_expression() != NULL | |
7972 | || (*pexpr)->receive_expression() != NULL) | |
7973 | { | |
7974 | this->found_ = true; | |
7975 | return TRAVERSE_EXIT; | |
7976 | } | |
7977 | return TRAVERSE_CONTINUE; | |
7978 | } | |
7979 | ||
7980 | // Return whether this is constant: len of a string constant, or len | |
7981 | // or cap of an array, or unsafe.Sizeof, unsafe.Offsetof, | |
7982 | // unsafe.Alignof. | |
e440a328 | 7983 | |
7984 | bool | |
7985 | Builtin_call_expression::do_is_constant() const | |
7986 | { | |
12e69faa | 7987 | if (this->is_error_expression()) |
7988 | return true; | |
e440a328 | 7989 | switch (this->code_) |
7990 | { | |
7991 | case BUILTIN_LEN: | |
7992 | case BUILTIN_CAP: | |
7993 | { | |
0f914071 | 7994 | if (this->seen_) |
7995 | return false; | |
7996 | ||
e440a328 | 7997 | Expression* arg = this->one_arg(); |
7998 | if (arg == NULL) | |
7999 | return false; | |
8000 | Type* arg_type = arg->type(); | |
8001 | ||
8002 | if (arg_type->points_to() != NULL | |
8003 | && arg_type->points_to()->array_type() != NULL | |
411eb89e | 8004 | && !arg_type->points_to()->is_slice_type()) |
e440a328 | 8005 | arg_type = arg_type->points_to(); |
8006 | ||
83921647 | 8007 | // The len and cap functions are only constant if there are no |
8008 | // function calls or channel operations in the arguments. | |
8009 | // Otherwise we have to make the call. | |
8010 | if (!arg->is_constant()) | |
8011 | { | |
8012 | Find_call_expression find_call; | |
8013 | Expression::traverse(&arg, &find_call); | |
8014 | if (find_call.found()) | |
8015 | return false; | |
8016 | } | |
8017 | ||
e440a328 | 8018 | if (arg_type->array_type() != NULL |
8019 | && arg_type->array_type()->length() != NULL) | |
0f914071 | 8020 | return true; |
e440a328 | 8021 | |
8022 | if (this->code_ == BUILTIN_LEN && arg_type->is_string_type()) | |
0f914071 | 8023 | { |
8024 | this->seen_ = true; | |
8025 | bool ret = arg->is_constant(); | |
8026 | this->seen_ = false; | |
8027 | return ret; | |
8028 | } | |
e440a328 | 8029 | } |
8030 | break; | |
8031 | ||
8032 | case BUILTIN_SIZEOF: | |
8033 | case BUILTIN_ALIGNOF: | |
8034 | return this->one_arg() != NULL; | |
8035 | ||
8036 | case BUILTIN_OFFSETOF: | |
8037 | { | |
8038 | Expression* arg = this->one_arg(); | |
8039 | if (arg == NULL) | |
8040 | return false; | |
8041 | return arg->field_reference_expression() != NULL; | |
8042 | } | |
8043 | ||
48080209 | 8044 | case BUILTIN_COMPLEX: |
e440a328 | 8045 | { |
8046 | const Expression_list* args = this->args(); | |
8047 | if (args != NULL && args->size() == 2) | |
8048 | return args->front()->is_constant() && args->back()->is_constant(); | |
8049 | } | |
8050 | break; | |
8051 | ||
8052 | case BUILTIN_REAL: | |
8053 | case BUILTIN_IMAG: | |
8054 | { | |
8055 | Expression* arg = this->one_arg(); | |
8056 | return arg != NULL && arg->is_constant(); | |
8057 | } | |
8058 | ||
8059 | default: | |
8060 | break; | |
8061 | } | |
8062 | ||
8063 | return false; | |
8064 | } | |
8065 | ||
0c77715b | 8066 | // Return a numeric constant if possible. |
e440a328 | 8067 | |
8068 | bool | |
0c77715b | 8069 | Builtin_call_expression::do_numeric_constant_value(Numeric_constant* nc) const |
e440a328 | 8070 | { |
8071 | if (this->code_ == BUILTIN_LEN | |
8072 | || this->code_ == BUILTIN_CAP) | |
8073 | { | |
8074 | Expression* arg = this->one_arg(); | |
8075 | if (arg == NULL) | |
8076 | return false; | |
8077 | Type* arg_type = arg->type(); | |
8078 | ||
8079 | if (this->code_ == BUILTIN_LEN && arg_type->is_string_type()) | |
8080 | { | |
8081 | std::string sval; | |
8082 | if (arg->string_constant_value(&sval)) | |
8083 | { | |
0c77715b | 8084 | nc->set_unsigned_long(Type::lookup_integer_type("int"), |
8085 | sval.length()); | |
e440a328 | 8086 | return true; |
8087 | } | |
8088 | } | |
8089 | ||
8090 | if (arg_type->points_to() != NULL | |
8091 | && arg_type->points_to()->array_type() != NULL | |
411eb89e | 8092 | && !arg_type->points_to()->is_slice_type()) |
e440a328 | 8093 | arg_type = arg_type->points_to(); |
8094 | ||
8095 | if (arg_type->array_type() != NULL | |
8096 | && arg_type->array_type()->length() != NULL) | |
8097 | { | |
0f914071 | 8098 | if (this->seen_) |
8099 | return false; | |
e440a328 | 8100 | Expression* e = arg_type->array_type()->length(); |
0f914071 | 8101 | this->seen_ = true; |
0c77715b | 8102 | bool r = e->numeric_constant_value(nc); |
0f914071 | 8103 | this->seen_ = false; |
8104 | if (r) | |
e440a328 | 8105 | { |
0c77715b | 8106 | if (!nc->set_type(Type::lookup_integer_type("int"), false, |
8107 | this->location())) | |
8108 | r = false; | |
e440a328 | 8109 | } |
0c77715b | 8110 | return r; |
e440a328 | 8111 | } |
8112 | } | |
8113 | else if (this->code_ == BUILTIN_SIZEOF | |
8114 | || this->code_ == BUILTIN_ALIGNOF) | |
8115 | { | |
8116 | Expression* arg = this->one_arg(); | |
8117 | if (arg == NULL) | |
8118 | return false; | |
8119 | Type* arg_type = arg->type(); | |
5c13bd80 | 8120 | if (arg_type->is_error()) |
e440a328 | 8121 | return false; |
8122 | if (arg_type->is_abstract()) | |
8123 | return false; | |
2c809f8f | 8124 | if (this->seen_) |
8125 | return false; | |
927a01eb | 8126 | |
3f378015 | 8127 | int64_t ret; |
e440a328 | 8128 | if (this->code_ == BUILTIN_SIZEOF) |
8129 | { | |
2c809f8f | 8130 | this->seen_ = true; |
8131 | bool ok = arg_type->backend_type_size(this->gogo_, &ret); | |
8132 | this->seen_ = false; | |
8133 | if (!ok) | |
e440a328 | 8134 | return false; |
8135 | } | |
8136 | else if (this->code_ == BUILTIN_ALIGNOF) | |
8137 | { | |
2c809f8f | 8138 | bool ok; |
8139 | this->seen_ = true; | |
637bd3af | 8140 | if (arg->field_reference_expression() == NULL) |
2c809f8f | 8141 | ok = arg_type->backend_type_align(this->gogo_, &ret); |
637bd3af | 8142 | else |
e440a328 | 8143 | { |
8144 | // Calling unsafe.Alignof(s.f) returns the alignment of | |
8145 | // the type of f when it is used as a field in a struct. | |
2c809f8f | 8146 | ok = arg_type->backend_type_field_align(this->gogo_, &ret); |
e440a328 | 8147 | } |
2c809f8f | 8148 | this->seen_ = false; |
8149 | if (!ok) | |
8150 | return false; | |
e440a328 | 8151 | } |
8152 | else | |
c3e6f413 | 8153 | go_unreachable(); |
927a01eb | 8154 | |
3f378015 | 8155 | mpz_t zval; |
8156 | set_mpz_from_int64(&zval, ret); | |
8157 | nc->set_int(Type::lookup_integer_type("uintptr"), zval); | |
8158 | mpz_clear(zval); | |
e440a328 | 8159 | return true; |
8160 | } | |
8161 | else if (this->code_ == BUILTIN_OFFSETOF) | |
8162 | { | |
8163 | Expression* arg = this->one_arg(); | |
8164 | if (arg == NULL) | |
8165 | return false; | |
8166 | Field_reference_expression* farg = arg->field_reference_expression(); | |
8167 | if (farg == NULL) | |
8168 | return false; | |
2c809f8f | 8169 | if (this->seen_) |
8170 | return false; | |
8171 | ||
3f378015 | 8172 | int64_t total_offset = 0; |
9a4bd570 | 8173 | while (true) |
8174 | { | |
8175 | Expression* struct_expr = farg->expr(); | |
8176 | Type* st = struct_expr->type(); | |
8177 | if (st->struct_type() == NULL) | |
8178 | return false; | |
8179 | if (st->named_type() != NULL) | |
8180 | st->named_type()->convert(this->gogo_); | |
3f378015 | 8181 | int64_t offset; |
2c809f8f | 8182 | this->seen_ = true; |
8183 | bool ok = st->struct_type()->backend_field_offset(this->gogo_, | |
8184 | farg->field_index(), | |
8185 | &offset); | |
8186 | this->seen_ = false; | |
8187 | if (!ok) | |
8188 | return false; | |
9a4bd570 | 8189 | total_offset += offset; |
8190 | if (farg->implicit() && struct_expr->field_reference_expression() != NULL) | |
8191 | { | |
8192 | // Go up until we reach the original base. | |
8193 | farg = struct_expr->field_reference_expression(); | |
8194 | continue; | |
8195 | } | |
8196 | break; | |
8197 | } | |
3f378015 | 8198 | mpz_t zval; |
8199 | set_mpz_from_int64(&zval, total_offset); | |
8200 | nc->set_int(Type::lookup_integer_type("uintptr"), zval); | |
8201 | mpz_clear(zval); | |
e440a328 | 8202 | return true; |
8203 | } | |
0c77715b | 8204 | else if (this->code_ == BUILTIN_REAL || this->code_ == BUILTIN_IMAG) |
e440a328 | 8205 | { |
8206 | Expression* arg = this->one_arg(); | |
8207 | if (arg == NULL) | |
8208 | return false; | |
8209 | ||
0c77715b | 8210 | Numeric_constant argnc; |
8211 | if (!arg->numeric_constant_value(&argnc)) | |
8212 | return false; | |
8213 | ||
fcbea5e4 | 8214 | mpc_t val; |
8215 | if (!argnc.to_complex(&val)) | |
0c77715b | 8216 | return false; |
e440a328 | 8217 | |
0c77715b | 8218 | Type* type = Builtin_call_expression::real_imag_type(argnc.type()); |
8219 | if (this->code_ == BUILTIN_REAL) | |
fcbea5e4 | 8220 | nc->set_float(type, mpc_realref(val)); |
0c77715b | 8221 | else |
fcbea5e4 | 8222 | nc->set_float(type, mpc_imagref(val)); |
8223 | mpc_clear(val); | |
0c77715b | 8224 | return true; |
e440a328 | 8225 | } |
0c77715b | 8226 | else if (this->code_ == BUILTIN_COMPLEX) |
e440a328 | 8227 | { |
8228 | const Expression_list* args = this->args(); | |
8229 | if (args == NULL || args->size() != 2) | |
8230 | return false; | |
8231 | ||
0c77715b | 8232 | Numeric_constant rnc; |
8233 | if (!args->front()->numeric_constant_value(&rnc)) | |
8234 | return false; | |
8235 | Numeric_constant inc; | |
8236 | if (!args->back()->numeric_constant_value(&inc)) | |
8237 | return false; | |
8238 | ||
8239 | if (rnc.type() != NULL | |
8240 | && !rnc.type()->is_abstract() | |
8241 | && inc.type() != NULL | |
8242 | && !inc.type()->is_abstract() | |
8243 | && !Type::are_identical(rnc.type(), inc.type(), false, NULL)) | |
8244 | return false; | |
8245 | ||
e440a328 | 8246 | mpfr_t r; |
0c77715b | 8247 | if (!rnc.to_float(&r)) |
8248 | return false; | |
8249 | mpfr_t i; | |
8250 | if (!inc.to_float(&i)) | |
e440a328 | 8251 | { |
8252 | mpfr_clear(r); | |
8253 | return false; | |
8254 | } | |
8255 | ||
0c77715b | 8256 | Type* arg_type = rnc.type(); |
8257 | if (arg_type == NULL || arg_type->is_abstract()) | |
8258 | arg_type = inc.type(); | |
e440a328 | 8259 | |
fcbea5e4 | 8260 | mpc_t val; |
8261 | mpc_init2(val, mpc_precision); | |
8262 | mpc_set_fr_fr(val, r, i, MPC_RNDNN); | |
e440a328 | 8263 | mpfr_clear(r); |
8264 | mpfr_clear(i); | |
8265 | ||
fcbea5e4 | 8266 | Type* type = Builtin_call_expression::complex_type(arg_type); |
8267 | nc->set_complex(type, val); | |
8268 | ||
8269 | mpc_clear(val); | |
8270 | ||
0c77715b | 8271 | return true; |
e440a328 | 8272 | } |
8273 | ||
8274 | return false; | |
8275 | } | |
8276 | ||
a7549a6a | 8277 | // Give an error if we are discarding the value of an expression which |
8278 | // should not normally be discarded. We don't give an error for | |
8279 | // discarding the value of an ordinary function call, but we do for | |
8280 | // builtin functions, purely for consistency with the gc compiler. | |
8281 | ||
4f2138d7 | 8282 | bool |
a7549a6a | 8283 | Builtin_call_expression::do_discarding_value() |
8284 | { | |
8285 | switch (this->code_) | |
8286 | { | |
8287 | case BUILTIN_INVALID: | |
8288 | default: | |
8289 | go_unreachable(); | |
8290 | ||
8291 | case BUILTIN_APPEND: | |
8292 | case BUILTIN_CAP: | |
8293 | case BUILTIN_COMPLEX: | |
8294 | case BUILTIN_IMAG: | |
8295 | case BUILTIN_LEN: | |
8296 | case BUILTIN_MAKE: | |
8297 | case BUILTIN_NEW: | |
8298 | case BUILTIN_REAL: | |
8299 | case BUILTIN_ALIGNOF: | |
8300 | case BUILTIN_OFFSETOF: | |
8301 | case BUILTIN_SIZEOF: | |
8302 | this->unused_value_error(); | |
4f2138d7 | 8303 | return false; |
a7549a6a | 8304 | |
8305 | case BUILTIN_CLOSE: | |
8306 | case BUILTIN_COPY: | |
1cce762f | 8307 | case BUILTIN_DELETE: |
a7549a6a | 8308 | case BUILTIN_PANIC: |
8309 | case BUILTIN_PRINT: | |
8310 | case BUILTIN_PRINTLN: | |
8311 | case BUILTIN_RECOVER: | |
4f2138d7 | 8312 | return true; |
a7549a6a | 8313 | } |
8314 | } | |
8315 | ||
e440a328 | 8316 | // Return the type. |
8317 | ||
8318 | Type* | |
8319 | Builtin_call_expression::do_type() | |
8320 | { | |
79651b1f | 8321 | if (this->is_error_expression()) |
8322 | return Type::make_error_type(); | |
e440a328 | 8323 | switch (this->code_) |
8324 | { | |
8325 | case BUILTIN_INVALID: | |
8326 | default: | |
79651b1f | 8327 | return Type::make_error_type(); |
e440a328 | 8328 | |
8329 | case BUILTIN_NEW: | |
8330 | case BUILTIN_MAKE: | |
8331 | { | |
8332 | const Expression_list* args = this->args(); | |
8333 | if (args == NULL || args->empty()) | |
8334 | return Type::make_error_type(); | |
8335 | return Type::make_pointer_type(args->front()->type()); | |
8336 | } | |
8337 | ||
8338 | case BUILTIN_CAP: | |
8339 | case BUILTIN_COPY: | |
8340 | case BUILTIN_LEN: | |
7ba86326 | 8341 | return Type::lookup_integer_type("int"); |
8342 | ||
e440a328 | 8343 | case BUILTIN_ALIGNOF: |
8344 | case BUILTIN_OFFSETOF: | |
8345 | case BUILTIN_SIZEOF: | |
7ba86326 | 8346 | return Type::lookup_integer_type("uintptr"); |
e440a328 | 8347 | |
8348 | case BUILTIN_CLOSE: | |
1cce762f | 8349 | case BUILTIN_DELETE: |
e440a328 | 8350 | case BUILTIN_PANIC: |
8351 | case BUILTIN_PRINT: | |
8352 | case BUILTIN_PRINTLN: | |
8353 | return Type::make_void_type(); | |
8354 | ||
e440a328 | 8355 | case BUILTIN_RECOVER: |
823c7e3d | 8356 | return Type::make_empty_interface_type(Linemap::predeclared_location()); |
e440a328 | 8357 | |
8358 | case BUILTIN_APPEND: | |
8359 | { | |
8360 | const Expression_list* args = this->args(); | |
8361 | if (args == NULL || args->empty()) | |
8362 | return Type::make_error_type(); | |
3ff4863b | 8363 | Type *ret = args->front()->type(); |
8364 | if (!ret->is_slice_type()) | |
8365 | return Type::make_error_type(); | |
8366 | return ret; | |
e440a328 | 8367 | } |
8368 | ||
8369 | case BUILTIN_REAL: | |
8370 | case BUILTIN_IMAG: | |
8371 | { | |
8372 | Expression* arg = this->one_arg(); | |
8373 | if (arg == NULL) | |
8374 | return Type::make_error_type(); | |
8375 | Type* t = arg->type(); | |
8376 | if (t->is_abstract()) | |
8377 | t = t->make_non_abstract_type(); | |
8378 | t = Builtin_call_expression::real_imag_type(t); | |
8379 | if (t == NULL) | |
8380 | t = Type::make_error_type(); | |
8381 | return t; | |
8382 | } | |
8383 | ||
48080209 | 8384 | case BUILTIN_COMPLEX: |
e440a328 | 8385 | { |
8386 | const Expression_list* args = this->args(); | |
8387 | if (args == NULL || args->size() != 2) | |
8388 | return Type::make_error_type(); | |
8389 | Type* t = args->front()->type(); | |
8390 | if (t->is_abstract()) | |
8391 | { | |
8392 | t = args->back()->type(); | |
8393 | if (t->is_abstract()) | |
8394 | t = t->make_non_abstract_type(); | |
8395 | } | |
48080209 | 8396 | t = Builtin_call_expression::complex_type(t); |
e440a328 | 8397 | if (t == NULL) |
8398 | t = Type::make_error_type(); | |
8399 | return t; | |
8400 | } | |
8401 | } | |
8402 | } | |
8403 | ||
8404 | // Determine the type. | |
8405 | ||
8406 | void | |
8407 | Builtin_call_expression::do_determine_type(const Type_context* context) | |
8408 | { | |
fb94b0ca | 8409 | if (!this->determining_types()) |
8410 | return; | |
8411 | ||
e440a328 | 8412 | this->fn()->determine_type_no_context(); |
8413 | ||
8414 | const Expression_list* args = this->args(); | |
8415 | ||
8416 | bool is_print; | |
8417 | Type* arg_type = NULL; | |
321e5ad2 | 8418 | Type* trailing_arg_types = NULL; |
e440a328 | 8419 | switch (this->code_) |
8420 | { | |
8421 | case BUILTIN_PRINT: | |
8422 | case BUILTIN_PRINTLN: | |
8423 | // Do not force a large integer constant to "int". | |
8424 | is_print = true; | |
8425 | break; | |
8426 | ||
8427 | case BUILTIN_REAL: | |
8428 | case BUILTIN_IMAG: | |
48080209 | 8429 | arg_type = Builtin_call_expression::complex_type(context->type); |
f6bc81e6 | 8430 | if (arg_type == NULL) |
8431 | arg_type = Type::lookup_complex_type("complex128"); | |
e440a328 | 8432 | is_print = false; |
8433 | break; | |
8434 | ||
48080209 | 8435 | case BUILTIN_COMPLEX: |
e440a328 | 8436 | { |
48080209 | 8437 | // For the complex function the type of one operand can |
e440a328 | 8438 | // determine the type of the other, as in a binary expression. |
8439 | arg_type = Builtin_call_expression::real_imag_type(context->type); | |
f6bc81e6 | 8440 | if (arg_type == NULL) |
8441 | arg_type = Type::lookup_float_type("float64"); | |
e440a328 | 8442 | if (args != NULL && args->size() == 2) |
8443 | { | |
8444 | Type* t1 = args->front()->type(); | |
c849bb59 | 8445 | Type* t2 = args->back()->type(); |
e440a328 | 8446 | if (!t1->is_abstract()) |
8447 | arg_type = t1; | |
8448 | else if (!t2->is_abstract()) | |
8449 | arg_type = t2; | |
8450 | } | |
8451 | is_print = false; | |
8452 | } | |
8453 | break; | |
8454 | ||
321e5ad2 | 8455 | case BUILTIN_APPEND: |
8456 | if (!this->is_varargs() | |
8457 | && args != NULL | |
8458 | && !args->empty() | |
8459 | && args->front()->type()->is_slice_type()) | |
8460 | trailing_arg_types = | |
8461 | args->front()->type()->array_type()->element_type(); | |
8462 | is_print = false; | |
8463 | break; | |
8464 | ||
e440a328 | 8465 | default: |
8466 | is_print = false; | |
8467 | break; | |
8468 | } | |
8469 | ||
8470 | if (args != NULL) | |
8471 | { | |
8472 | for (Expression_list::const_iterator pa = args->begin(); | |
8473 | pa != args->end(); | |
8474 | ++pa) | |
8475 | { | |
8476 | Type_context subcontext; | |
8477 | subcontext.type = arg_type; | |
8478 | ||
8479 | if (is_print) | |
8480 | { | |
8481 | // We want to print large constants, we so can't just | |
8482 | // use the appropriate nonabstract type. Use uint64 for | |
8483 | // an integer if we know it is nonnegative, otherwise | |
8484 | // use int64 for a integer, otherwise use float64 for a | |
8485 | // float or complex128 for a complex. | |
8486 | Type* want_type = NULL; | |
8487 | Type* atype = (*pa)->type(); | |
8488 | if (atype->is_abstract()) | |
8489 | { | |
8490 | if (atype->integer_type() != NULL) | |
8491 | { | |
0c77715b | 8492 | Numeric_constant nc; |
8493 | if (this->numeric_constant_value(&nc)) | |
8494 | { | |
8495 | mpz_t val; | |
8496 | if (nc.to_int(&val)) | |
8497 | { | |
8498 | if (mpz_sgn(val) >= 0) | |
8499 | want_type = Type::lookup_integer_type("uint64"); | |
8500 | mpz_clear(val); | |
8501 | } | |
8502 | } | |
8503 | if (want_type == NULL) | |
e440a328 | 8504 | want_type = Type::lookup_integer_type("int64"); |
e440a328 | 8505 | } |
8506 | else if (atype->float_type() != NULL) | |
8507 | want_type = Type::lookup_float_type("float64"); | |
8508 | else if (atype->complex_type() != NULL) | |
8509 | want_type = Type::lookup_complex_type("complex128"); | |
8510 | else if (atype->is_abstract_string_type()) | |
8511 | want_type = Type::lookup_string_type(); | |
8512 | else if (atype->is_abstract_boolean_type()) | |
8513 | want_type = Type::lookup_bool_type(); | |
8514 | else | |
c3e6f413 | 8515 | go_unreachable(); |
e440a328 | 8516 | subcontext.type = want_type; |
8517 | } | |
8518 | } | |
8519 | ||
8520 | (*pa)->determine_type(&subcontext); | |
321e5ad2 | 8521 | |
8522 | if (trailing_arg_types != NULL) | |
8523 | { | |
8524 | arg_type = trailing_arg_types; | |
8525 | trailing_arg_types = NULL; | |
8526 | } | |
e440a328 | 8527 | } |
8528 | } | |
8529 | } | |
8530 | ||
8531 | // If there is exactly one argument, return true. Otherwise give an | |
8532 | // error message and return false. | |
8533 | ||
8534 | bool | |
8535 | Builtin_call_expression::check_one_arg() | |
8536 | { | |
8537 | const Expression_list* args = this->args(); | |
8538 | if (args == NULL || args->size() < 1) | |
8539 | { | |
8540 | this->report_error(_("not enough arguments")); | |
8541 | return false; | |
8542 | } | |
8543 | else if (args->size() > 1) | |
8544 | { | |
8545 | this->report_error(_("too many arguments")); | |
8546 | return false; | |
8547 | } | |
8548 | if (args->front()->is_error_expression() | |
5c13bd80 | 8549 | || args->front()->type()->is_error()) |
e440a328 | 8550 | { |
8551 | this->set_is_error(); | |
8552 | return false; | |
8553 | } | |
8554 | return true; | |
8555 | } | |
8556 | ||
8557 | // Check argument types for a builtin function. | |
8558 | ||
8559 | void | |
8560 | Builtin_call_expression::do_check_types(Gogo*) | |
8561 | { | |
375646ea | 8562 | if (this->is_error_expression()) |
8563 | return; | |
e440a328 | 8564 | switch (this->code_) |
8565 | { | |
8566 | case BUILTIN_INVALID: | |
8567 | case BUILTIN_NEW: | |
8568 | case BUILTIN_MAKE: | |
cd238b8d | 8569 | case BUILTIN_DELETE: |
e440a328 | 8570 | return; |
8571 | ||
8572 | case BUILTIN_LEN: | |
8573 | case BUILTIN_CAP: | |
8574 | { | |
8575 | // The single argument may be either a string or an array or a | |
8576 | // map or a channel, or a pointer to a closed array. | |
8577 | if (this->check_one_arg()) | |
8578 | { | |
8579 | Type* arg_type = this->one_arg()->type(); | |
8580 | if (arg_type->points_to() != NULL | |
8581 | && arg_type->points_to()->array_type() != NULL | |
411eb89e | 8582 | && !arg_type->points_to()->is_slice_type()) |
e440a328 | 8583 | arg_type = arg_type->points_to(); |
8584 | if (this->code_ == BUILTIN_CAP) | |
8585 | { | |
5c13bd80 | 8586 | if (!arg_type->is_error() |
e440a328 | 8587 | && arg_type->array_type() == NULL |
8588 | && arg_type->channel_type() == NULL) | |
8589 | this->report_error(_("argument must be array or slice " | |
8590 | "or channel")); | |
8591 | } | |
8592 | else | |
8593 | { | |
5c13bd80 | 8594 | if (!arg_type->is_error() |
e440a328 | 8595 | && !arg_type->is_string_type() |
8596 | && arg_type->array_type() == NULL | |
8597 | && arg_type->map_type() == NULL | |
8598 | && arg_type->channel_type() == NULL) | |
8599 | this->report_error(_("argument must be string or " | |
8600 | "array or slice or map or channel")); | |
8601 | } | |
8602 | } | |
8603 | } | |
8604 | break; | |
8605 | ||
8606 | case BUILTIN_PRINT: | |
8607 | case BUILTIN_PRINTLN: | |
8608 | { | |
8609 | const Expression_list* args = this->args(); | |
8610 | if (args == NULL) | |
8611 | { | |
8612 | if (this->code_ == BUILTIN_PRINT) | |
631d5788 | 8613 | go_warning_at(this->location(), 0, |
e440a328 | 8614 | "no arguments for builtin function %<%s%>", |
8615 | (this->code_ == BUILTIN_PRINT | |
8616 | ? "print" | |
8617 | : "println")); | |
8618 | } | |
8619 | else | |
8620 | { | |
8621 | for (Expression_list::const_iterator p = args->begin(); | |
8622 | p != args->end(); | |
8623 | ++p) | |
8624 | { | |
8625 | Type* type = (*p)->type(); | |
5c13bd80 | 8626 | if (type->is_error() |
e440a328 | 8627 | || type->is_string_type() |
8628 | || type->integer_type() != NULL | |
8629 | || type->float_type() != NULL | |
8630 | || type->complex_type() != NULL | |
8631 | || type->is_boolean_type() | |
8632 | || type->points_to() != NULL | |
8633 | || type->interface_type() != NULL | |
8634 | || type->channel_type() != NULL | |
8635 | || type->map_type() != NULL | |
8636 | || type->function_type() != NULL | |
411eb89e | 8637 | || type->is_slice_type()) |
e440a328 | 8638 | ; |
acf8e158 | 8639 | else if ((*p)->is_type_expression()) |
8640 | { | |
8641 | // If this is a type expression it's going to give | |
8642 | // an error anyhow, so we don't need one here. | |
8643 | } | |
e440a328 | 8644 | else |
8645 | this->report_error(_("unsupported argument type to " | |
8646 | "builtin function")); | |
8647 | } | |
8648 | } | |
8649 | } | |
8650 | break; | |
8651 | ||
8652 | case BUILTIN_CLOSE: | |
e440a328 | 8653 | if (this->check_one_arg()) |
8654 | { | |
8655 | if (this->one_arg()->type()->channel_type() == NULL) | |
8656 | this->report_error(_("argument must be channel")); | |
5202d986 | 8657 | else if (!this->one_arg()->type()->channel_type()->may_send()) |
8658 | this->report_error(_("cannot close receive-only channel")); | |
e440a328 | 8659 | } |
8660 | break; | |
8661 | ||
8662 | case BUILTIN_PANIC: | |
8663 | case BUILTIN_SIZEOF: | |
8664 | case BUILTIN_ALIGNOF: | |
8665 | this->check_one_arg(); | |
8666 | break; | |
8667 | ||
8668 | case BUILTIN_RECOVER: | |
6334270b | 8669 | if (this->args() != NULL |
8670 | && !this->args()->empty() | |
8671 | && !this->recover_arg_is_set_) | |
e440a328 | 8672 | this->report_error(_("too many arguments")); |
8673 | break; | |
8674 | ||
8675 | case BUILTIN_OFFSETOF: | |
8676 | if (this->check_one_arg()) | |
8677 | { | |
8678 | Expression* arg = this->one_arg(); | |
8679 | if (arg->field_reference_expression() == NULL) | |
8680 | this->report_error(_("argument must be a field reference")); | |
8681 | } | |
8682 | break; | |
8683 | ||
8684 | case BUILTIN_COPY: | |
8685 | { | |
8686 | const Expression_list* args = this->args(); | |
8687 | if (args == NULL || args->size() < 2) | |
8688 | { | |
8689 | this->report_error(_("not enough arguments")); | |
8690 | break; | |
8691 | } | |
8692 | else if (args->size() > 2) | |
8693 | { | |
8694 | this->report_error(_("too many arguments")); | |
8695 | break; | |
8696 | } | |
8697 | Type* arg1_type = args->front()->type(); | |
8698 | Type* arg2_type = args->back()->type(); | |
5c13bd80 | 8699 | if (arg1_type->is_error() || arg2_type->is_error()) |
6bebb39d | 8700 | { |
8701 | this->set_is_error(); | |
8702 | break; | |
8703 | } | |
e440a328 | 8704 | |
8705 | Type* e1; | |
411eb89e | 8706 | if (arg1_type->is_slice_type()) |
e440a328 | 8707 | e1 = arg1_type->array_type()->element_type(); |
8708 | else | |
8709 | { | |
8710 | this->report_error(_("left argument must be a slice")); | |
8711 | break; | |
8712 | } | |
8713 | ||
411eb89e | 8714 | if (arg2_type->is_slice_type()) |
60963afd | 8715 | { |
8716 | Type* e2 = arg2_type->array_type()->element_type(); | |
8717 | if (!Type::are_identical(e1, e2, true, NULL)) | |
8718 | this->report_error(_("element types must be the same")); | |
8719 | } | |
e440a328 | 8720 | else if (arg2_type->is_string_type()) |
e440a328 | 8721 | { |
60963afd | 8722 | if (e1->integer_type() == NULL || !e1->integer_type()->is_byte()) |
8723 | this->report_error(_("first argument must be []byte")); | |
e440a328 | 8724 | } |
60963afd | 8725 | else |
8726 | this->report_error(_("second argument must be slice or string")); | |
e440a328 | 8727 | } |
8728 | break; | |
8729 | ||
8730 | case BUILTIN_APPEND: | |
8731 | { | |
8732 | const Expression_list* args = this->args(); | |
321e5ad2 | 8733 | if (args == NULL || args->empty()) |
e440a328 | 8734 | { |
8735 | this->report_error(_("not enough arguments")); | |
8736 | break; | |
8737 | } | |
321e5ad2 | 8738 | |
8739 | Type* slice_type = args->front()->type(); | |
8740 | if (!slice_type->is_slice_type()) | |
6bebb39d | 8741 | { |
321e5ad2 | 8742 | if (slice_type->is_error_type()) |
8743 | break; | |
8744 | if (slice_type->is_nil_type()) | |
8745 | go_error_at(args->front()->location(), "use of untyped nil"); | |
8746 | else | |
8747 | go_error_at(args->front()->location(), | |
8748 | "argument 1 must be a slice"); | |
6bebb39d | 8749 | this->set_is_error(); |
8750 | break; | |
8751 | } | |
cd238b8d | 8752 | |
321e5ad2 | 8753 | Type* element_type = slice_type->array_type()->element_type(); |
22deed0d | 8754 | if (!element_type->in_heap()) |
8755 | go_error_at(args->front()->location(), | |
8756 | "can't append to slice of go:notinheap type"); | |
321e5ad2 | 8757 | if (this->is_varargs()) |
4fd4fcf4 | 8758 | { |
321e5ad2 | 8759 | if (!args->back()->type()->is_slice_type() |
8760 | && !args->back()->type()->is_string_type()) | |
8761 | { | |
8762 | go_error_at(args->back()->location(), | |
8763 | "invalid use of %<...%> with non-slice/non-string"); | |
8764 | this->set_is_error(); | |
8765 | break; | |
8766 | } | |
4fd4fcf4 | 8767 | |
321e5ad2 | 8768 | if (args->size() < 2) |
8769 | { | |
8770 | this->report_error(_("not enough arguments")); | |
8771 | break; | |
8772 | } | |
8773 | if (args->size() > 2) | |
8774 | { | |
8775 | this->report_error(_("too many arguments")); | |
8776 | break; | |
8777 | } | |
8778 | ||
8779 | if (args->back()->type()->is_string_type() | |
8780 | && element_type->integer_type() != NULL | |
8781 | && element_type->integer_type()->is_byte()) | |
8782 | { | |
8783 | // Permit append(s1, s2...) when s1 is a slice of | |
8784 | // bytes and s2 is a string type. | |
8785 | } | |
e440a328 | 8786 | else |
8787 | { | |
321e5ad2 | 8788 | // We have to test for assignment compatibility to a |
8789 | // slice of the element type, which is not necessarily | |
8790 | // the same as the type of the first argument: the | |
8791 | // first argument might have a named type. | |
8792 | Type* check_type = Type::make_array_type(element_type, NULL); | |
8793 | std::string reason; | |
8794 | if (!Type::are_assignable(check_type, args->back()->type(), | |
8795 | &reason)) | |
8796 | { | |
8797 | if (reason.empty()) | |
8798 | go_error_at(args->back()->location(), | |
8799 | "argument 2 has invalid type"); | |
8800 | else | |
8801 | go_error_at(args->back()->location(), | |
8802 | "argument 2 has invalid type (%s)", | |
8803 | reason.c_str()); | |
8804 | this->set_is_error(); | |
8805 | break; | |
8806 | } | |
8807 | } | |
8808 | } | |
8809 | else | |
8810 | { | |
8811 | Expression_list::const_iterator pa = args->begin(); | |
8812 | int i = 2; | |
8813 | for (++pa; pa != args->end(); ++pa, ++i) | |
8814 | { | |
8815 | std::string reason; | |
8816 | if (!Type::are_assignable(element_type, (*pa)->type(), | |
8817 | &reason)) | |
8818 | { | |
8819 | if (reason.empty()) | |
8820 | go_error_at((*pa)->location(), | |
8821 | "argument %d has incompatible type", i); | |
8822 | else | |
8823 | go_error_at((*pa)->location(), | |
8824 | "argument %d has incompatible type (%s)", | |
8825 | i, reason.c_str()); | |
8826 | this->set_is_error(); | |
8827 | } | |
e440a328 | 8828 | } |
8829 | } | |
e440a328 | 8830 | } |
321e5ad2 | 8831 | break; |
e440a328 | 8832 | |
8833 | case BUILTIN_REAL: | |
8834 | case BUILTIN_IMAG: | |
8835 | if (this->check_one_arg()) | |
8836 | { | |
8837 | if (this->one_arg()->type()->complex_type() == NULL) | |
8838 | this->report_error(_("argument must have complex type")); | |
8839 | } | |
8840 | break; | |
8841 | ||
48080209 | 8842 | case BUILTIN_COMPLEX: |
e440a328 | 8843 | { |
8844 | const Expression_list* args = this->args(); | |
8845 | if (args == NULL || args->size() < 2) | |
8846 | this->report_error(_("not enough arguments")); | |
8847 | else if (args->size() > 2) | |
8848 | this->report_error(_("too many arguments")); | |
8849 | else if (args->front()->is_error_expression() | |
5c13bd80 | 8850 | || args->front()->type()->is_error() |
e440a328 | 8851 | || args->back()->is_error_expression() |
5c13bd80 | 8852 | || args->back()->type()->is_error()) |
e440a328 | 8853 | this->set_is_error(); |
8854 | else if (!Type::are_identical(args->front()->type(), | |
07ba8be5 | 8855 | args->back()->type(), true, NULL)) |
48080209 | 8856 | this->report_error(_("complex arguments must have identical types")); |
e440a328 | 8857 | else if (args->front()->type()->float_type() == NULL) |
48080209 | 8858 | this->report_error(_("complex arguments must have " |
e440a328 | 8859 | "floating-point type")); |
8860 | } | |
8861 | break; | |
8862 | ||
8863 | default: | |
c3e6f413 | 8864 | go_unreachable(); |
e440a328 | 8865 | } |
8866 | } | |
8867 | ||
72666aed | 8868 | Expression* |
8869 | Builtin_call_expression::do_copy() | |
8870 | { | |
8871 | Call_expression* bce = | |
8872 | new Builtin_call_expression(this->gogo_, this->fn()->copy(), | |
da244e59 | 8873 | (this->args() == NULL |
8874 | ? NULL | |
8875 | : this->args()->copy()), | |
72666aed | 8876 | this->is_varargs(), |
8877 | this->location()); | |
8878 | ||
8879 | if (this->varargs_are_lowered()) | |
8880 | bce->set_varargs_are_lowered(); | |
8881 | return bce; | |
8882 | } | |
8883 | ||
ea664253 | 8884 | // Return the backend representation for a builtin function. |
e440a328 | 8885 | |
ea664253 | 8886 | Bexpression* |
8887 | Builtin_call_expression::do_get_backend(Translate_context* context) | |
e440a328 | 8888 | { |
8889 | Gogo* gogo = context->gogo(); | |
b13c66cd | 8890 | Location location = this->location(); |
a0d8874e | 8891 | |
8892 | if (this->is_erroneous_call()) | |
8893 | { | |
8894 | go_assert(saw_errors()); | |
8895 | return gogo->backend()->error_expression(); | |
8896 | } | |
8897 | ||
e440a328 | 8898 | switch (this->code_) |
8899 | { | |
8900 | case BUILTIN_INVALID: | |
8901 | case BUILTIN_NEW: | |
8902 | case BUILTIN_MAKE: | |
c3e6f413 | 8903 | go_unreachable(); |
e440a328 | 8904 | |
8905 | case BUILTIN_LEN: | |
8906 | case BUILTIN_CAP: | |
8907 | { | |
8908 | const Expression_list* args = this->args(); | |
c484d925 | 8909 | go_assert(args != NULL && args->size() == 1); |
2c809f8f | 8910 | Expression* arg = args->front(); |
e440a328 | 8911 | Type* arg_type = arg->type(); |
0f914071 | 8912 | |
8913 | if (this->seen_) | |
8914 | { | |
c484d925 | 8915 | go_assert(saw_errors()); |
ea664253 | 8916 | return context->backend()->error_expression(); |
0f914071 | 8917 | } |
8918 | this->seen_ = true; | |
0f914071 | 8919 | this->seen_ = false; |
e440a328 | 8920 | if (arg_type->points_to() != NULL) |
8921 | { | |
8922 | arg_type = arg_type->points_to(); | |
c484d925 | 8923 | go_assert(arg_type->array_type() != NULL |
411eb89e | 8924 | && !arg_type->is_slice_type()); |
2c809f8f | 8925 | arg = Expression::make_unary(OPERATOR_MULT, arg, location); |
e440a328 | 8926 | } |
8927 | ||
1b1f2abf | 8928 | Type* int_type = Type::lookup_integer_type("int"); |
2c809f8f | 8929 | Expression* val; |
e440a328 | 8930 | if (this->code_ == BUILTIN_LEN) |
8931 | { | |
8932 | if (arg_type->is_string_type()) | |
2c809f8f | 8933 | val = Expression::make_string_info(arg, STRING_INFO_LENGTH, |
8934 | location); | |
e440a328 | 8935 | else if (arg_type->array_type() != NULL) |
0f914071 | 8936 | { |
8937 | if (this->seen_) | |
8938 | { | |
c484d925 | 8939 | go_assert(saw_errors()); |
ea664253 | 8940 | return context->backend()->error_expression(); |
0f914071 | 8941 | } |
8942 | this->seen_ = true; | |
2c809f8f | 8943 | val = arg_type->array_type()->get_length(gogo, arg); |
0f914071 | 8944 | this->seen_ = false; |
8945 | } | |
0d5530d9 | 8946 | else if (arg_type->map_type() != NULL |
8947 | || arg_type->channel_type() != NULL) | |
8948 | { | |
8949 | // The first field is the length. If the pointer is | |
8950 | // nil, the length is zero. | |
8951 | Type* pint_type = Type::make_pointer_type(int_type); | |
8952 | arg = Expression::make_unsafe_cast(pint_type, arg, location); | |
8953 | Expression* nil = Expression::make_nil(location); | |
8954 | nil = Expression::make_cast(pint_type, nil, location); | |
8955 | Expression* cmp = Expression::make_binary(OPERATOR_EQEQ, | |
8956 | arg, nil, location); | |
8957 | Expression* zero = Expression::make_integer_ul(0, int_type, | |
8958 | location); | |
8959 | Expression* indir = Expression::make_unary(OPERATOR_MULT, | |
8960 | arg, location); | |
8961 | val = Expression::make_conditional(cmp, zero, indir, location); | |
8962 | } | |
e440a328 | 8963 | else |
c3e6f413 | 8964 | go_unreachable(); |
e440a328 | 8965 | } |
8966 | else | |
8967 | { | |
8968 | if (arg_type->array_type() != NULL) | |
0f914071 | 8969 | { |
8970 | if (this->seen_) | |
8971 | { | |
c484d925 | 8972 | go_assert(saw_errors()); |
ea664253 | 8973 | return context->backend()->error_expression(); |
0f914071 | 8974 | } |
8975 | this->seen_ = true; | |
2c809f8f | 8976 | val = arg_type->array_type()->get_capacity(gogo, arg); |
0f914071 | 8977 | this->seen_ = false; |
8978 | } | |
e440a328 | 8979 | else if (arg_type->channel_type() != NULL) |
132ed071 | 8980 | { |
8981 | // The second field is the capacity. If the pointer | |
8982 | // is nil, the capacity is zero. | |
8983 | Type* uintptr_type = Type::lookup_integer_type("uintptr"); | |
8984 | Type* pint_type = Type::make_pointer_type(int_type); | |
8985 | Expression* parg = Expression::make_unsafe_cast(uintptr_type, | |
8986 | arg, | |
8987 | location); | |
8988 | int off = int_type->integer_type()->bits() / 8; | |
8989 | Expression* eoff = Expression::make_integer_ul(off, | |
8990 | uintptr_type, | |
8991 | location); | |
8992 | parg = Expression::make_binary(OPERATOR_PLUS, parg, eoff, | |
8993 | location); | |
8994 | parg = Expression::make_unsafe_cast(pint_type, parg, location); | |
8995 | Expression* nil = Expression::make_nil(location); | |
8996 | nil = Expression::make_cast(pint_type, nil, location); | |
8997 | Expression* cmp = Expression::make_binary(OPERATOR_EQEQ, | |
8998 | arg, nil, location); | |
8999 | Expression* zero = Expression::make_integer_ul(0, int_type, | |
9000 | location); | |
9001 | Expression* indir = Expression::make_unary(OPERATOR_MULT, | |
9002 | parg, location); | |
9003 | val = Expression::make_conditional(cmp, zero, indir, location); | |
9004 | } | |
e440a328 | 9005 | else |
c3e6f413 | 9006 | go_unreachable(); |
e440a328 | 9007 | } |
9008 | ||
2c809f8f | 9009 | return Expression::make_cast(int_type, val, |
ea664253 | 9010 | location)->get_backend(context); |
e440a328 | 9011 | } |
9012 | ||
9013 | case BUILTIN_PRINT: | |
9014 | case BUILTIN_PRINTLN: | |
9015 | { | |
9016 | const bool is_ln = this->code_ == BUILTIN_PRINTLN; | |
88b03a70 | 9017 | |
9018 | Expression* print_stmts = Runtime::make_call(Runtime::PRINTLOCK, | |
9019 | location, 0); | |
e440a328 | 9020 | |
9021 | const Expression_list* call_args = this->args(); | |
9022 | if (call_args != NULL) | |
9023 | { | |
9024 | for (Expression_list::const_iterator p = call_args->begin(); | |
9025 | p != call_args->end(); | |
9026 | ++p) | |
9027 | { | |
9028 | if (is_ln && p != call_args->begin()) | |
9029 | { | |
2c809f8f | 9030 | Expression* print_space = |
88b03a70 | 9031 | Runtime::make_call(Runtime::PRINTSP, location, 0); |
e440a328 | 9032 | |
2c809f8f | 9033 | print_stmts = |
9034 | Expression::make_compound(print_stmts, print_space, | |
9035 | location); | |
9036 | } | |
e440a328 | 9037 | |
2c809f8f | 9038 | Expression* arg = *p; |
9039 | Type* type = arg->type(); | |
9040 | Runtime::Function code; | |
e440a328 | 9041 | if (type->is_string_type()) |
88b03a70 | 9042 | code = Runtime::PRINTSTRING; |
e440a328 | 9043 | else if (type->integer_type() != NULL |
9044 | && type->integer_type()->is_unsigned()) | |
9045 | { | |
e440a328 | 9046 | Type* itype = Type::lookup_integer_type("uint64"); |
2c809f8f | 9047 | arg = Expression::make_cast(itype, arg, location); |
88b03a70 | 9048 | code = Runtime::PRINTUINT; |
e440a328 | 9049 | } |
9050 | else if (type->integer_type() != NULL) | |
9051 | { | |
e440a328 | 9052 | Type* itype = Type::lookup_integer_type("int64"); |
2c809f8f | 9053 | arg = Expression::make_cast(itype, arg, location); |
88b03a70 | 9054 | code = Runtime::PRINTINT; |
e440a328 | 9055 | } |
9056 | else if (type->float_type() != NULL) | |
9057 | { | |
2c809f8f | 9058 | Type* dtype = Type::lookup_float_type("float64"); |
9059 | arg = Expression::make_cast(dtype, arg, location); | |
88b03a70 | 9060 | code = Runtime::PRINTFLOAT; |
e440a328 | 9061 | } |
9062 | else if (type->complex_type() != NULL) | |
9063 | { | |
2c809f8f | 9064 | Type* ctype = Type::lookup_complex_type("complex128"); |
9065 | arg = Expression::make_cast(ctype, arg, location); | |
88b03a70 | 9066 | code = Runtime::PRINTCOMPLEX; |
e440a328 | 9067 | } |
9068 | else if (type->is_boolean_type()) | |
88b03a70 | 9069 | code = Runtime::PRINTBOOL; |
e440a328 | 9070 | else if (type->points_to() != NULL |
9071 | || type->channel_type() != NULL | |
9072 | || type->map_type() != NULL | |
9073 | || type->function_type() != NULL) | |
9074 | { | |
2c809f8f | 9075 | arg = Expression::make_cast(type, arg, location); |
88b03a70 | 9076 | code = Runtime::PRINTPOINTER; |
e440a328 | 9077 | } |
9078 | else if (type->interface_type() != NULL) | |
9079 | { | |
9080 | if (type->interface_type()->is_empty()) | |
88b03a70 | 9081 | code = Runtime::PRINTEFACE; |
e440a328 | 9082 | else |
88b03a70 | 9083 | code = Runtime::PRINTIFACE; |
e440a328 | 9084 | } |
411eb89e | 9085 | else if (type->is_slice_type()) |
88b03a70 | 9086 | code = Runtime::PRINTSLICE; |
e440a328 | 9087 | else |
cd238b8d | 9088 | { |
9089 | go_assert(saw_errors()); | |
ea664253 | 9090 | return context->backend()->error_expression(); |
cd238b8d | 9091 | } |
e440a328 | 9092 | |
2c809f8f | 9093 | Expression* call = Runtime::make_call(code, location, 1, arg); |
88b03a70 | 9094 | print_stmts = Expression::make_compound(print_stmts, call, |
9095 | location); | |
e440a328 | 9096 | } |
9097 | } | |
9098 | ||
9099 | if (is_ln) | |
9100 | { | |
2c809f8f | 9101 | Expression* print_nl = |
88b03a70 | 9102 | Runtime::make_call(Runtime::PRINTNL, location, 0); |
9103 | print_stmts = Expression::make_compound(print_stmts, print_nl, | |
9104 | location); | |
e440a328 | 9105 | } |
9106 | ||
88b03a70 | 9107 | Expression* unlock = Runtime::make_call(Runtime::PRINTUNLOCK, |
9108 | location, 0); | |
9109 | print_stmts = Expression::make_compound(print_stmts, unlock, location); | |
32e3ff69 | 9110 | |
ea664253 | 9111 | return print_stmts->get_backend(context); |
e440a328 | 9112 | } |
9113 | ||
9114 | case BUILTIN_PANIC: | |
9115 | { | |
9116 | const Expression_list* args = this->args(); | |
c484d925 | 9117 | go_assert(args != NULL && args->size() == 1); |
e440a328 | 9118 | Expression* arg = args->front(); |
b13c66cd | 9119 | Type *empty = |
823c7e3d | 9120 | Type::make_empty_interface_type(Linemap::predeclared_location()); |
2c809f8f | 9121 | arg = Expression::convert_for_assignment(gogo, empty, arg, location); |
9122 | ||
9123 | Expression* panic = | |
03ac9de4 | 9124 | Runtime::make_call(Runtime::GOPANIC, location, 1, arg); |
ea664253 | 9125 | return panic->get_backend(context); |
e440a328 | 9126 | } |
9127 | ||
9128 | case BUILTIN_RECOVER: | |
9129 | { | |
9130 | // The argument is set when building recover thunks. It's a | |
9131 | // boolean value which is true if we can recover a value now. | |
9132 | const Expression_list* args = this->args(); | |
c484d925 | 9133 | go_assert(args != NULL && args->size() == 1); |
e440a328 | 9134 | Expression* arg = args->front(); |
b13c66cd | 9135 | Type *empty = |
823c7e3d | 9136 | Type::make_empty_interface_type(Linemap::predeclared_location()); |
e440a328 | 9137 | |
e440a328 | 9138 | Expression* nil = Expression::make_nil(location); |
2c809f8f | 9139 | nil = Expression::convert_for_assignment(gogo, empty, nil, location); |
e440a328 | 9140 | |
9141 | // We need to handle a deferred call to recover specially, | |
9142 | // because it changes whether it can recover a panic or not. | |
9143 | // See test7 in test/recover1.go. | |
2c809f8f | 9144 | Expression* recover = Runtime::make_call((this->is_deferred() |
03ac9de4 | 9145 | ? Runtime::DEFERREDRECOVER |
9146 | : Runtime::GORECOVER), | |
2c809f8f | 9147 | location, 0); |
9148 | Expression* cond = | |
9149 | Expression::make_conditional(arg, recover, nil, location); | |
ea664253 | 9150 | return cond->get_backend(context); |
e440a328 | 9151 | } |
9152 | ||
9153 | case BUILTIN_CLOSE: | |
e440a328 | 9154 | { |
9155 | const Expression_list* args = this->args(); | |
c484d925 | 9156 | go_assert(args != NULL && args->size() == 1); |
e440a328 | 9157 | Expression* arg = args->front(); |
2c809f8f | 9158 | Expression* close = Runtime::make_call(Runtime::CLOSE, location, |
9159 | 1, arg); | |
ea664253 | 9160 | return close->get_backend(context); |
e440a328 | 9161 | } |
9162 | ||
9163 | case BUILTIN_SIZEOF: | |
9164 | case BUILTIN_OFFSETOF: | |
9165 | case BUILTIN_ALIGNOF: | |
9166 | { | |
0c77715b | 9167 | Numeric_constant nc; |
9168 | unsigned long val; | |
9169 | if (!this->numeric_constant_value(&nc) | |
9170 | || nc.to_unsigned_long(&val) != Numeric_constant::NC_UL_VALID) | |
7f1d9abd | 9171 | { |
c484d925 | 9172 | go_assert(saw_errors()); |
ea664253 | 9173 | return context->backend()->error_expression(); |
7f1d9abd | 9174 | } |
7ba86326 | 9175 | Type* uintptr_type = Type::lookup_integer_type("uintptr"); |
2c809f8f | 9176 | mpz_t ival; |
9177 | nc.get_int(&ival); | |
9178 | Expression* int_cst = | |
e67508fa | 9179 | Expression::make_integer_z(&ival, uintptr_type, location); |
2c809f8f | 9180 | mpz_clear(ival); |
ea664253 | 9181 | return int_cst->get_backend(context); |
e440a328 | 9182 | } |
9183 | ||
9184 | case BUILTIN_COPY: | |
9185 | { | |
9186 | const Expression_list* args = this->args(); | |
c484d925 | 9187 | go_assert(args != NULL && args->size() == 2); |
e440a328 | 9188 | Expression* arg1 = args->front(); |
9189 | Expression* arg2 = args->back(); | |
9190 | ||
e440a328 | 9191 | Type* arg1_type = arg1->type(); |
9192 | Array_type* at = arg1_type->array_type(); | |
35a54f17 | 9193 | go_assert(arg1->is_variable()); |
321e5ad2 | 9194 | |
9195 | Expression* call; | |
e440a328 | 9196 | |
9197 | Type* arg2_type = arg2->type(); | |
2c809f8f | 9198 | go_assert(arg2->is_variable()); |
321e5ad2 | 9199 | if (arg2_type->is_string_type()) |
9200 | call = Runtime::make_call(Runtime::SLICESTRINGCOPY, location, | |
9201 | 2, arg1, arg2); | |
e440a328 | 9202 | else |
9203 | { | |
321e5ad2 | 9204 | Type* et = at->element_type(); |
9205 | if (et->has_pointer()) | |
9206 | { | |
9207 | Expression* td = Expression::make_type_descriptor(et, | |
9208 | location); | |
9209 | call = Runtime::make_call(Runtime::TYPEDSLICECOPY, location, | |
9210 | 3, td, arg1, arg2); | |
9211 | } | |
9212 | else | |
9213 | { | |
9214 | Expression* sz = Expression::make_type_info(et, | |
9215 | TYPE_INFO_SIZE); | |
9216 | call = Runtime::make_call(Runtime::SLICECOPY, location, 3, | |
9217 | arg1, arg2, sz); | |
9218 | } | |
e440a328 | 9219 | } |
2c809f8f | 9220 | |
321e5ad2 | 9221 | return call->get_backend(context); |
e440a328 | 9222 | } |
9223 | ||
9224 | case BUILTIN_APPEND: | |
321e5ad2 | 9225 | // Handled in Builtin_call_expression::flatten_append. |
9226 | go_unreachable(); | |
e440a328 | 9227 | |
9228 | case BUILTIN_REAL: | |
9229 | case BUILTIN_IMAG: | |
9230 | { | |
9231 | const Expression_list* args = this->args(); | |
c484d925 | 9232 | go_assert(args != NULL && args->size() == 1); |
2c809f8f | 9233 | |
9234 | Bexpression* ret; | |
ea664253 | 9235 | Bexpression* bcomplex = args->front()->get_backend(context); |
2c809f8f | 9236 | if (this->code_ == BUILTIN_REAL) |
9237 | ret = gogo->backend()->real_part_expression(bcomplex, location); | |
9238 | else | |
9239 | ret = gogo->backend()->imag_part_expression(bcomplex, location); | |
ea664253 | 9240 | return ret; |
e440a328 | 9241 | } |
9242 | ||
48080209 | 9243 | case BUILTIN_COMPLEX: |
e440a328 | 9244 | { |
9245 | const Expression_list* args = this->args(); | |
c484d925 | 9246 | go_assert(args != NULL && args->size() == 2); |
ea664253 | 9247 | Bexpression* breal = args->front()->get_backend(context); |
9248 | Bexpression* bimag = args->back()->get_backend(context); | |
9249 | return gogo->backend()->complex_expression(breal, bimag, location); | |
e440a328 | 9250 | } |
9251 | ||
9252 | default: | |
c3e6f413 | 9253 | go_unreachable(); |
e440a328 | 9254 | } |
9255 | } | |
9256 | ||
9257 | // We have to support exporting a builtin call expression, because | |
9258 | // code can set a constant to the result of a builtin expression. | |
9259 | ||
9260 | void | |
9261 | Builtin_call_expression::do_export(Export* exp) const | |
9262 | { | |
0c77715b | 9263 | Numeric_constant nc; |
9264 | if (!this->numeric_constant_value(&nc)) | |
9265 | { | |
631d5788 | 9266 | go_error_at(this->location(), "value is not constant"); |
0c77715b | 9267 | return; |
9268 | } | |
e440a328 | 9269 | |
0c77715b | 9270 | if (nc.is_int()) |
e440a328 | 9271 | { |
0c77715b | 9272 | mpz_t val; |
9273 | nc.get_int(&val); | |
e440a328 | 9274 | Integer_expression::export_integer(exp, val); |
0c77715b | 9275 | mpz_clear(val); |
e440a328 | 9276 | } |
0c77715b | 9277 | else if (nc.is_float()) |
e440a328 | 9278 | { |
9279 | mpfr_t fval; | |
0c77715b | 9280 | nc.get_float(&fval); |
9281 | Float_expression::export_float(exp, fval); | |
e440a328 | 9282 | mpfr_clear(fval); |
9283 | } | |
0c77715b | 9284 | else if (nc.is_complex()) |
e440a328 | 9285 | { |
fcbea5e4 | 9286 | mpc_t cval; |
9287 | nc.get_complex(&cval); | |
9288 | Complex_expression::export_complex(exp, cval); | |
9289 | mpc_clear(cval); | |
e440a328 | 9290 | } |
0c77715b | 9291 | else |
9292 | go_unreachable(); | |
e440a328 | 9293 | |
9294 | // A trailing space lets us reliably identify the end of the number. | |
9295 | exp->write_c_string(" "); | |
9296 | } | |
9297 | ||
9298 | // Class Call_expression. | |
9299 | ||
8381eda7 | 9300 | // A Go function can be viewed in a couple of different ways. The |
9301 | // code of a Go function becomes a backend function with parameters | |
9302 | // whose types are simply the backend representation of the Go types. | |
9303 | // If there are multiple results, they are returned as a backend | |
9304 | // struct. | |
9305 | ||
9306 | // However, when Go code refers to a function other than simply | |
9307 | // calling it, the backend type of that function is actually a struct. | |
9308 | // The first field of the struct points to the Go function code | |
9309 | // (sometimes a wrapper as described below). The remaining fields | |
9310 | // hold addresses of closed-over variables. This struct is called a | |
9311 | // closure. | |
9312 | ||
9313 | // There are a few cases to consider. | |
9314 | ||
9315 | // A direct function call of a known function in package scope. In | |
9316 | // this case there are no closed-over variables, and we know the name | |
9317 | // of the function code. We can simply produce a backend call to the | |
9318 | // function directly, and not worry about the closure. | |
9319 | ||
9320 | // A direct function call of a known function literal. In this case | |
9321 | // we know the function code and we know the closure. We generate the | |
9322 | // function code such that it expects an additional final argument of | |
9323 | // the closure type. We pass the closure as the last argument, after | |
9324 | // the other arguments. | |
9325 | ||
9326 | // An indirect function call. In this case we have a closure. We | |
9327 | // load the pointer to the function code from the first field of the | |
9328 | // closure. We pass the address of the closure as the last argument. | |
9329 | ||
9330 | // A call to a method of an interface. Type methods are always at | |
9331 | // package scope, so we call the function directly, and don't worry | |
9332 | // about the closure. | |
9333 | ||
9334 | // This means that for a function at package scope we have two cases. | |
9335 | // One is the direct call, which has no closure. The other is the | |
9336 | // indirect call, which does have a closure. We can't simply ignore | |
9337 | // the closure, even though it is the last argument, because that will | |
9338 | // fail on targets where the function pops its arguments. So when | |
9339 | // generating a closure for a package-scope function we set the | |
9340 | // function code pointer in the closure to point to a wrapper | |
9341 | // function. This wrapper function accepts a final argument that | |
9342 | // points to the closure, ignores it, and calls the real function as a | |
9343 | // direct function call. This wrapper will normally be efficient, and | |
9344 | // can often simply be a tail call to the real function. | |
9345 | ||
9346 | // We don't use GCC's static chain pointer because 1) we don't need | |
9347 | // it; 2) GCC only permits using a static chain to call a known | |
9348 | // function, so we can't use it for an indirect call anyhow. Since we | |
9349 | // can't use it for an indirect call, we may as well not worry about | |
9350 | // using it for a direct call either. | |
9351 | ||
9352 | // We pass the closure last rather than first because it means that | |
9353 | // the function wrapper we put into a closure for a package-scope | |
9354 | // function can normally just be a tail call to the real function. | |
9355 | ||
9356 | // For method expressions we generate a wrapper that loads the | |
9357 | // receiver from the closure and then calls the method. This | |
9358 | // unfortunately forces reshuffling the arguments, since there is a | |
9359 | // new first argument, but we can't avoid reshuffling either for | |
9360 | // method expressions or for indirect calls of package-scope | |
9361 | // functions, and since the latter are more common we reshuffle for | |
9362 | // method expressions. | |
9363 | ||
9364 | // Note that the Go code retains the Go types. The extra final | |
9365 | // argument only appears when we convert to the backend | |
9366 | // representation. | |
9367 | ||
e440a328 | 9368 | // Traversal. |
9369 | ||
9370 | int | |
9371 | Call_expression::do_traverse(Traverse* traverse) | |
9372 | { | |
0c0dacab | 9373 | // If we are calling a function in a different package that returns |
9374 | // an unnamed type, this may be the only chance we get to traverse | |
9375 | // that type. We don't traverse this->type_ because it may be a | |
9376 | // Call_multiple_result_type that will just lead back here. | |
9377 | if (this->type_ != NULL && !this->type_->is_error_type()) | |
9378 | { | |
9379 | Function_type *fntype = this->get_function_type(); | |
9380 | if (fntype != NULL && Type::traverse(fntype, traverse) == TRAVERSE_EXIT) | |
9381 | return TRAVERSE_EXIT; | |
9382 | } | |
e440a328 | 9383 | if (Expression::traverse(&this->fn_, traverse) == TRAVERSE_EXIT) |
9384 | return TRAVERSE_EXIT; | |
9385 | if (this->args_ != NULL) | |
9386 | { | |
9387 | if (this->args_->traverse(traverse) == TRAVERSE_EXIT) | |
9388 | return TRAVERSE_EXIT; | |
9389 | } | |
9390 | return TRAVERSE_CONTINUE; | |
9391 | } | |
9392 | ||
9393 | // Lower a call statement. | |
9394 | ||
9395 | Expression* | |
ceeb4318 | 9396 | Call_expression::do_lower(Gogo* gogo, Named_object* function, |
9397 | Statement_inserter* inserter, int) | |
e440a328 | 9398 | { |
b13c66cd | 9399 | Location loc = this->location(); |
09ea332d | 9400 | |
ceeb4318 | 9401 | // A type cast can look like a function call. |
e440a328 | 9402 | if (this->fn_->is_type_expression() |
9403 | && this->args_ != NULL | |
9404 | && this->args_->size() == 1) | |
9405 | return Expression::make_cast(this->fn_->type(), this->args_->front(), | |
09ea332d | 9406 | loc); |
e440a328 | 9407 | |
88f06749 | 9408 | // Because do_type will return an error type and thus prevent future |
9409 | // errors, check for that case now to ensure that the error gets | |
9410 | // reported. | |
37448b10 | 9411 | Function_type* fntype = this->get_function_type(); |
9412 | if (fntype == NULL) | |
88f06749 | 9413 | { |
9414 | if (!this->fn_->type()->is_error()) | |
9415 | this->report_error(_("expected function")); | |
5f1045b5 | 9416 | this->set_is_error(); |
9417 | return this; | |
88f06749 | 9418 | } |
9419 | ||
e440a328 | 9420 | // Handle an argument which is a call to a function which returns |
9421 | // multiple results. | |
9422 | if (this->args_ != NULL | |
9423 | && this->args_->size() == 1 | |
37448b10 | 9424 | && this->args_->front()->call_expression() != NULL) |
e440a328 | 9425 | { |
e440a328 | 9426 | size_t rc = this->args_->front()->call_expression()->result_count(); |
9427 | if (rc > 1 | |
37448b10 | 9428 | && ((fntype->parameters() != NULL |
9429 | && (fntype->parameters()->size() == rc | |
9430 | || (fntype->is_varargs() | |
9431 | && fntype->parameters()->size() - 1 <= rc))) | |
9432 | || fntype->is_builtin())) | |
e440a328 | 9433 | { |
9434 | Call_expression* call = this->args_->front()->call_expression(); | |
e90ecd2d | 9435 | call->set_is_multi_value_arg(); |
c33af8e4 | 9436 | if (this->is_varargs_) |
9437 | { | |
9438 | // It is not clear which result of a multiple result call | |
9439 | // the ellipsis operator should be applied to. If we unpack the | |
9440 | // the call into its individual results here, the ellipsis will be | |
9441 | // applied to the last result. | |
631d5788 | 9442 | go_error_at(call->location(), |
9443 | _("multiple-value argument in single-value context")); | |
c33af8e4 | 9444 | return Expression::make_error(call->location()); |
9445 | } | |
9446 | ||
e440a328 | 9447 | Expression_list* args = new Expression_list; |
9448 | for (size_t i = 0; i < rc; ++i) | |
9449 | args->push_back(Expression::make_call_result(call, i)); | |
9450 | // We can't return a new call expression here, because this | |
42535814 | 9451 | // one may be referenced by Call_result expressions. We |
9452 | // also can't delete the old arguments, because we may still | |
9453 | // traverse them somewhere up the call stack. FIXME. | |
e440a328 | 9454 | this->args_ = args; |
9455 | } | |
9456 | } | |
9457 | ||
37448b10 | 9458 | // Recognize a call to a builtin function. |
9459 | if (fntype->is_builtin()) | |
9460 | return new Builtin_call_expression(gogo, this->fn_, this->args_, | |
9461 | this->is_varargs_, loc); | |
9462 | ||
ceeb4318 | 9463 | // If this call returns multiple results, create a temporary |
5731103c | 9464 | // variable to hold them. |
9465 | if (this->result_count() > 1 && this->call_temp_ == NULL) | |
ceeb4318 | 9466 | { |
5731103c | 9467 | Struct_field_list* sfl = new Struct_field_list(); |
9468 | Function_type* fntype = this->get_function_type(); | |
37448b10 | 9469 | const Typed_identifier_list* results = fntype->results(); |
5731103c | 9470 | Location loc = this->location(); |
9471 | ||
9472 | int i = 0; | |
9473 | char buf[20]; | |
ceeb4318 | 9474 | for (Typed_identifier_list::const_iterator p = results->begin(); |
5731103c | 9475 | p != results->end(); |
9476 | ++p, ++i) | |
9477 | { | |
9478 | snprintf(buf, sizeof buf, "res%d", i); | |
9479 | sfl->push_back(Struct_field(Typed_identifier(buf, p->type(), loc))); | |
9480 | } | |
9481 | ||
9482 | Struct_type* st = Type::make_struct_type(sfl, loc); | |
9483 | st->set_is_struct_incomparable(); | |
9484 | this->call_temp_ = Statement::make_temporary(st, NULL, loc); | |
9485 | inserter->insert(this->call_temp_); | |
ceeb4318 | 9486 | } |
9487 | ||
e440a328 | 9488 | // Handle a call to a varargs function by packaging up the extra |
9489 | // parameters. | |
37448b10 | 9490 | if (fntype->is_varargs()) |
e440a328 | 9491 | { |
e440a328 | 9492 | const Typed_identifier_list* parameters = fntype->parameters(); |
c484d925 | 9493 | go_assert(parameters != NULL && !parameters->empty()); |
e440a328 | 9494 | Type* varargs_type = parameters->back().type(); |
09ea332d | 9495 | this->lower_varargs(gogo, function, inserter, varargs_type, |
0e9a2e72 | 9496 | parameters->size(), SLICE_STORAGE_MAY_ESCAPE); |
09ea332d | 9497 | } |
9498 | ||
9499 | // If this is call to a method, call the method directly passing the | |
9500 | // object as the first parameter. | |
9501 | Bound_method_expression* bme = this->fn_->bound_method_expression(); | |
9502 | if (bme != NULL) | |
9503 | { | |
0afbb937 | 9504 | Named_object* methodfn = bme->function(); |
09ea332d | 9505 | Expression* first_arg = bme->first_argument(); |
9506 | ||
9507 | // We always pass a pointer when calling a method. | |
9508 | if (first_arg->type()->points_to() == NULL | |
9509 | && !first_arg->type()->is_error()) | |
9510 | { | |
9511 | first_arg = Expression::make_unary(OPERATOR_AND, first_arg, loc); | |
9512 | // We may need to create a temporary variable so that we can | |
9513 | // take the address. We can't do that here because it will | |
9514 | // mess up the order of evaluation. | |
9515 | Unary_expression* ue = static_cast<Unary_expression*>(first_arg); | |
9516 | ue->set_create_temp(); | |
9517 | } | |
9518 | ||
9519 | // If we are calling a method which was inherited from an | |
9520 | // embedded struct, and the method did not get a stub, then the | |
9521 | // first type may be wrong. | |
9522 | Type* fatype = bme->first_argument_type(); | |
9523 | if (fatype != NULL) | |
9524 | { | |
9525 | if (fatype->points_to() == NULL) | |
9526 | fatype = Type::make_pointer_type(fatype); | |
9527 | first_arg = Expression::make_unsafe_cast(fatype, first_arg, loc); | |
9528 | } | |
9529 | ||
9530 | Expression_list* new_args = new Expression_list(); | |
9531 | new_args->push_back(first_arg); | |
9532 | if (this->args_ != NULL) | |
9533 | { | |
9534 | for (Expression_list::const_iterator p = this->args_->begin(); | |
9535 | p != this->args_->end(); | |
9536 | ++p) | |
9537 | new_args->push_back(*p); | |
9538 | } | |
9539 | ||
9540 | // We have to change in place because this structure may be | |
9541 | // referenced by Call_result_expressions. We can't delete the | |
9542 | // old arguments, because we may be traversing them up in some | |
9543 | // caller. FIXME. | |
9544 | this->args_ = new_args; | |
0afbb937 | 9545 | this->fn_ = Expression::make_func_reference(methodfn, NULL, |
09ea332d | 9546 | bme->location()); |
e440a328 | 9547 | } |
9548 | ||
105f9a24 | 9549 | // Handle a couple of special runtime functions. In the runtime |
9550 | // package, getcallerpc returns the PC of the caller, and | |
9551 | // getcallersp returns the frame pointer of the caller. Implement | |
9552 | // these by turning them into calls to GCC builtin functions. We | |
9553 | // could implement them in normal code, but then we would have to | |
9554 | // explicitly unwind the stack. These functions are intended to be | |
9555 | // efficient. Note that this technique obviously only works for | |
9556 | // direct calls, but that is the only way they are used. The actual | |
9557 | // argument to these functions is always the address of a parameter; | |
9558 | // we don't need that for the GCC builtin functions, so we just | |
9559 | // ignore it. | |
9560 | if (gogo->compiling_runtime() | |
9561 | && this->args_ != NULL | |
9562 | && this->args_->size() == 1 | |
9563 | && gogo->package_name() == "runtime") | |
9564 | { | |
9565 | Func_expression* fe = this->fn_->func_expression(); | |
9566 | if (fe != NULL | |
9567 | && fe->named_object()->is_function_declaration() | |
9568 | && fe->named_object()->package() == NULL) | |
9569 | { | |
9570 | std::string n = Gogo::unpack_hidden_name(fe->named_object()->name()); | |
9571 | if (n == "getcallerpc") | |
9572 | { | |
9573 | static Named_object* builtin_return_address; | |
9574 | return this->lower_to_builtin(&builtin_return_address, | |
9575 | "__builtin_return_address", | |
9576 | 0); | |
9577 | } | |
9578 | else if (n == "getcallersp") | |
9579 | { | |
9580 | static Named_object* builtin_frame_address; | |
9581 | return this->lower_to_builtin(&builtin_frame_address, | |
9582 | "__builtin_frame_address", | |
9583 | 1); | |
9584 | } | |
9585 | } | |
9586 | } | |
9587 | ||
e440a328 | 9588 | return this; |
9589 | } | |
9590 | ||
9591 | // Lower a call to a varargs function. FUNCTION is the function in | |
9592 | // which the call occurs--it's not the function we are calling. | |
9593 | // VARARGS_TYPE is the type of the varargs parameter, a slice type. | |
9594 | // PARAM_COUNT is the number of parameters of the function we are | |
9595 | // calling; the last of these parameters will be the varargs | |
9596 | // parameter. | |
9597 | ||
09ea332d | 9598 | void |
e440a328 | 9599 | Call_expression::lower_varargs(Gogo* gogo, Named_object* function, |
ceeb4318 | 9600 | Statement_inserter* inserter, |
0e9a2e72 | 9601 | Type* varargs_type, size_t param_count, |
9602 | Slice_storage_escape_disp escape_disp) | |
e440a328 | 9603 | { |
03118c21 | 9604 | // When compiling the runtime, varargs slices do not escape. When |
9605 | // escape analysis becomes the default, this should be changed to | |
9606 | // make it an error if we have a varargs slice that escapes. | |
9607 | if (gogo->compiling_runtime() && gogo->package_name() == "runtime") | |
9608 | escape_disp = SLICE_STORAGE_DOES_NOT_ESCAPE; | |
9609 | ||
e440a328 | 9610 | if (this->varargs_are_lowered_) |
09ea332d | 9611 | return; |
e440a328 | 9612 | |
b13c66cd | 9613 | Location loc = this->location(); |
e440a328 | 9614 | |
c484d925 | 9615 | go_assert(param_count > 0); |
411eb89e | 9616 | go_assert(varargs_type->is_slice_type()); |
e440a328 | 9617 | |
9618 | size_t arg_count = this->args_ == NULL ? 0 : this->args_->size(); | |
9619 | if (arg_count < param_count - 1) | |
9620 | { | |
9621 | // Not enough arguments; will be caught in check_types. | |
09ea332d | 9622 | return; |
e440a328 | 9623 | } |
9624 | ||
9625 | Expression_list* old_args = this->args_; | |
9626 | Expression_list* new_args = new Expression_list(); | |
9627 | bool push_empty_arg = false; | |
9628 | if (old_args == NULL || old_args->empty()) | |
9629 | { | |
c484d925 | 9630 | go_assert(param_count == 1); |
e440a328 | 9631 | push_empty_arg = true; |
9632 | } | |
9633 | else | |
9634 | { | |
9635 | Expression_list::const_iterator pa; | |
9636 | int i = 1; | |
9637 | for (pa = old_args->begin(); pa != old_args->end(); ++pa, ++i) | |
9638 | { | |
9639 | if (static_cast<size_t>(i) == param_count) | |
9640 | break; | |
9641 | new_args->push_back(*pa); | |
9642 | } | |
9643 | ||
9644 | // We have reached the varargs parameter. | |
9645 | ||
9646 | bool issued_error = false; | |
9647 | if (pa == old_args->end()) | |
9648 | push_empty_arg = true; | |
9649 | else if (pa + 1 == old_args->end() && this->is_varargs_) | |
9650 | new_args->push_back(*pa); | |
9651 | else if (this->is_varargs_) | |
9652 | { | |
a6645f74 | 9653 | if ((*pa)->type()->is_slice_type()) |
9654 | this->report_error(_("too many arguments")); | |
9655 | else | |
9656 | { | |
631d5788 | 9657 | go_error_at(this->location(), |
9658 | _("invalid use of %<...%> with non-slice")); | |
a6645f74 | 9659 | this->set_is_error(); |
9660 | } | |
09ea332d | 9661 | return; |
e440a328 | 9662 | } |
e440a328 | 9663 | else |
9664 | { | |
9665 | Type* element_type = varargs_type->array_type()->element_type(); | |
9666 | Expression_list* vals = new Expression_list; | |
9667 | for (; pa != old_args->end(); ++pa, ++i) | |
9668 | { | |
9669 | // Check types here so that we get a better message. | |
9670 | Type* patype = (*pa)->type(); | |
b13c66cd | 9671 | Location paloc = (*pa)->location(); |
e440a328 | 9672 | if (!this->check_argument_type(i, element_type, patype, |
9673 | paloc, issued_error)) | |
9674 | continue; | |
9675 | vals->push_back(*pa); | |
9676 | } | |
0e9a2e72 | 9677 | Slice_construction_expression* sce = |
e440a328 | 9678 | Expression::make_slice_composite_literal(varargs_type, vals, loc); |
0e9a2e72 | 9679 | if (escape_disp == SLICE_STORAGE_DOES_NOT_ESCAPE) |
9680 | sce->set_storage_does_not_escape(); | |
9681 | Expression* val = sce; | |
09ea332d | 9682 | gogo->lower_expression(function, inserter, &val); |
e440a328 | 9683 | new_args->push_back(val); |
9684 | } | |
9685 | } | |
9686 | ||
9687 | if (push_empty_arg) | |
9688 | new_args->push_back(Expression::make_nil(loc)); | |
9689 | ||
9690 | // We can't return a new call expression here, because this one may | |
6d4c2432 | 9691 | // be referenced by Call_result expressions. FIXME. We can't |
9692 | // delete OLD_ARGS because we may have both a Call_expression and a | |
9693 | // Builtin_call_expression which refer to them. FIXME. | |
e440a328 | 9694 | this->args_ = new_args; |
9695 | this->varargs_are_lowered_ = true; | |
e440a328 | 9696 | } |
9697 | ||
105f9a24 | 9698 | // Return a call to __builtin_return_address or __builtin_frame_address. |
9699 | ||
9700 | Expression* | |
9701 | Call_expression::lower_to_builtin(Named_object** pno, const char* name, | |
9702 | int arg) | |
9703 | { | |
9704 | if (*pno == NULL) | |
9705 | *pno = Gogo::declare_builtin_rf_address(name); | |
9706 | ||
9707 | Location loc = this->location(); | |
9708 | ||
9709 | Expression* fn = Expression::make_func_reference(*pno, NULL, loc); | |
9710 | Expression* a = Expression::make_integer_ul(arg, NULL, loc); | |
9711 | Expression_list *args = new Expression_list(); | |
9712 | args->push_back(a); | |
9713 | Expression* call = Expression::make_call(fn, args, false, loc); | |
9714 | ||
9715 | // The builtin functions return void*, but the Go functions return uintptr. | |
9716 | Type* uintptr_type = Type::lookup_integer_type("uintptr"); | |
9717 | return Expression::make_cast(uintptr_type, call, loc); | |
9718 | } | |
9719 | ||
2c809f8f | 9720 | // Flatten a call with multiple results into a temporary. |
9721 | ||
9722 | Expression* | |
b8e86a51 | 9723 | Call_expression::do_flatten(Gogo* gogo, Named_object*, |
9724 | Statement_inserter* inserter) | |
2c809f8f | 9725 | { |
5bf8be8b | 9726 | if (this->is_erroneous_call()) |
9727 | { | |
9728 | go_assert(saw_errors()); | |
9729 | return Expression::make_error(this->location()); | |
9730 | } | |
b8e86a51 | 9731 | |
91c0fd76 | 9732 | if (this->is_flattened_) |
9733 | return this; | |
9734 | this->is_flattened_ = true; | |
9735 | ||
b8e86a51 | 9736 | // Add temporary variables for all arguments that require type |
9737 | // conversion. | |
9738 | Function_type* fntype = this->get_function_type(); | |
9782d556 | 9739 | if (fntype == NULL) |
9740 | { | |
9741 | go_assert(saw_errors()); | |
9742 | return this; | |
9743 | } | |
b8e86a51 | 9744 | if (this->args_ != NULL && !this->args_->empty() |
9745 | && fntype->parameters() != NULL && !fntype->parameters()->empty()) | |
9746 | { | |
9747 | bool is_interface_method = | |
9748 | this->fn_->interface_field_reference_expression() != NULL; | |
9749 | ||
9750 | Expression_list *args = new Expression_list(); | |
9751 | Typed_identifier_list::const_iterator pp = fntype->parameters()->begin(); | |
9752 | Expression_list::const_iterator pa = this->args_->begin(); | |
9753 | if (!is_interface_method && fntype->is_method()) | |
9754 | { | |
9755 | // The receiver argument. | |
9756 | args->push_back(*pa); | |
9757 | ++pa; | |
9758 | } | |
9759 | for (; pa != this->args_->end(); ++pa, ++pp) | |
9760 | { | |
9761 | go_assert(pp != fntype->parameters()->end()); | |
9762 | if (Type::are_identical(pp->type(), (*pa)->type(), true, NULL)) | |
9763 | args->push_back(*pa); | |
9764 | else | |
9765 | { | |
9766 | Location loc = (*pa)->location(); | |
8ba8cc87 | 9767 | Expression* arg = *pa; |
9768 | if (!arg->is_variable()) | |
9769 | { | |
9770 | Temporary_statement *temp = | |
9771 | Statement::make_temporary(NULL, arg, loc); | |
9772 | inserter->insert(temp); | |
9773 | arg = Expression::make_temporary_reference(temp, loc); | |
9774 | } | |
9775 | arg = Expression::convert_for_assignment(gogo, pp->type(), arg, | |
9776 | loc); | |
9777 | args->push_back(arg); | |
b8e86a51 | 9778 | } |
9779 | } | |
9780 | delete this->args_; | |
9781 | this->args_ = args; | |
9782 | } | |
9783 | ||
2c809f8f | 9784 | return this; |
9785 | } | |
9786 | ||
ceeb4318 | 9787 | // Get the function type. This can return NULL in error cases. |
e440a328 | 9788 | |
9789 | Function_type* | |
9790 | Call_expression::get_function_type() const | |
9791 | { | |
9792 | return this->fn_->type()->function_type(); | |
9793 | } | |
9794 | ||
9795 | // Return the number of values which this call will return. | |
9796 | ||
9797 | size_t | |
9798 | Call_expression::result_count() const | |
9799 | { | |
9800 | const Function_type* fntype = this->get_function_type(); | |
9801 | if (fntype == NULL) | |
9802 | return 0; | |
9803 | if (fntype->results() == NULL) | |
9804 | return 0; | |
9805 | return fntype->results()->size(); | |
9806 | } | |
9807 | ||
5731103c | 9808 | // Return the temporary that holds the result for a call with multiple |
9809 | // results. | |
ceeb4318 | 9810 | |
9811 | Temporary_statement* | |
5731103c | 9812 | Call_expression::results() const |
ceeb4318 | 9813 | { |
5731103c | 9814 | if (this->call_temp_ == NULL) |
cd238b8d | 9815 | { |
9816 | go_assert(saw_errors()); | |
9817 | return NULL; | |
9818 | } | |
5731103c | 9819 | return this->call_temp_; |
ceeb4318 | 9820 | } |
9821 | ||
1373401e | 9822 | // Set the number of results expected from a call expression. |
9823 | ||
9824 | void | |
9825 | Call_expression::set_expected_result_count(size_t count) | |
9826 | { | |
9827 | go_assert(this->expected_result_count_ == 0); | |
9828 | this->expected_result_count_ = count; | |
9829 | } | |
9830 | ||
e440a328 | 9831 | // Return whether this is a call to the predeclared function recover. |
9832 | ||
9833 | bool | |
9834 | Call_expression::is_recover_call() const | |
9835 | { | |
9836 | return this->do_is_recover_call(); | |
9837 | } | |
9838 | ||
9839 | // Set the argument to the recover function. | |
9840 | ||
9841 | void | |
9842 | Call_expression::set_recover_arg(Expression* arg) | |
9843 | { | |
9844 | this->do_set_recover_arg(arg); | |
9845 | } | |
9846 | ||
9847 | // Virtual functions also implemented by Builtin_call_expression. | |
9848 | ||
9849 | bool | |
9850 | Call_expression::do_is_recover_call() const | |
9851 | { | |
9852 | return false; | |
9853 | } | |
9854 | ||
9855 | void | |
9856 | Call_expression::do_set_recover_arg(Expression*) | |
9857 | { | |
c3e6f413 | 9858 | go_unreachable(); |
e440a328 | 9859 | } |
9860 | ||
ceeb4318 | 9861 | // We have found an error with this call expression; return true if |
9862 | // we should report it. | |
9863 | ||
9864 | bool | |
9865 | Call_expression::issue_error() | |
9866 | { | |
9867 | if (this->issued_error_) | |
9868 | return false; | |
9869 | else | |
9870 | { | |
9871 | this->issued_error_ = true; | |
9872 | return true; | |
9873 | } | |
9874 | } | |
9875 | ||
5bf8be8b | 9876 | // Whether or not this call contains errors, either in the call or the |
9877 | // arguments to the call. | |
9878 | ||
9879 | bool | |
9880 | Call_expression::is_erroneous_call() | |
9881 | { | |
9882 | if (this->is_error_expression() || this->fn()->is_error_expression()) | |
9883 | return true; | |
9884 | ||
9885 | if (this->args() == NULL) | |
9886 | return false; | |
9887 | for (Expression_list::iterator pa = this->args()->begin(); | |
9888 | pa != this->args()->end(); | |
9889 | ++pa) | |
9890 | { | |
9891 | if ((*pa)->type()->is_error_type() || (*pa)->is_error_expression()) | |
9892 | return true; | |
9893 | } | |
9894 | return false; | |
9895 | } | |
9896 | ||
e440a328 | 9897 | // Get the type. |
9898 | ||
9899 | Type* | |
9900 | Call_expression::do_type() | |
9901 | { | |
9902 | if (this->type_ != NULL) | |
9903 | return this->type_; | |
9904 | ||
9905 | Type* ret; | |
9906 | Function_type* fntype = this->get_function_type(); | |
9907 | if (fntype == NULL) | |
9908 | return Type::make_error_type(); | |
9909 | ||
9910 | const Typed_identifier_list* results = fntype->results(); | |
9911 | if (results == NULL) | |
9912 | ret = Type::make_void_type(); | |
9913 | else if (results->size() == 1) | |
9914 | ret = results->begin()->type(); | |
9915 | else | |
9916 | ret = Type::make_call_multiple_result_type(this); | |
9917 | ||
9918 | this->type_ = ret; | |
9919 | ||
9920 | return this->type_; | |
9921 | } | |
9922 | ||
9923 | // Determine types for a call expression. We can use the function | |
9924 | // parameter types to set the types of the arguments. | |
9925 | ||
9926 | void | |
9927 | Call_expression::do_determine_type(const Type_context*) | |
9928 | { | |
fb94b0ca | 9929 | if (!this->determining_types()) |
9930 | return; | |
9931 | ||
e440a328 | 9932 | this->fn_->determine_type_no_context(); |
9933 | Function_type* fntype = this->get_function_type(); | |
9934 | const Typed_identifier_list* parameters = NULL; | |
9935 | if (fntype != NULL) | |
9936 | parameters = fntype->parameters(); | |
9937 | if (this->args_ != NULL) | |
9938 | { | |
9939 | Typed_identifier_list::const_iterator pt; | |
9940 | if (parameters != NULL) | |
9941 | pt = parameters->begin(); | |
09ea332d | 9942 | bool first = true; |
e440a328 | 9943 | for (Expression_list::const_iterator pa = this->args_->begin(); |
9944 | pa != this->args_->end(); | |
9945 | ++pa) | |
9946 | { | |
09ea332d | 9947 | if (first) |
9948 | { | |
9949 | first = false; | |
9950 | // If this is a method, the first argument is the | |
9951 | // receiver. | |
9952 | if (fntype != NULL && fntype->is_method()) | |
9953 | { | |
9954 | Type* rtype = fntype->receiver()->type(); | |
9955 | // The receiver is always passed as a pointer. | |
9956 | if (rtype->points_to() == NULL) | |
9957 | rtype = Type::make_pointer_type(rtype); | |
9958 | Type_context subcontext(rtype, false); | |
9959 | (*pa)->determine_type(&subcontext); | |
9960 | continue; | |
9961 | } | |
9962 | } | |
9963 | ||
e440a328 | 9964 | if (parameters != NULL && pt != parameters->end()) |
9965 | { | |
9966 | Type_context subcontext(pt->type(), false); | |
9967 | (*pa)->determine_type(&subcontext); | |
9968 | ++pt; | |
9969 | } | |
9970 | else | |
9971 | (*pa)->determine_type_no_context(); | |
9972 | } | |
9973 | } | |
9974 | } | |
9975 | ||
fb94b0ca | 9976 | // Called when determining types for a Call_expression. Return true |
9977 | // if we should go ahead, false if they have already been determined. | |
9978 | ||
9979 | bool | |
9980 | Call_expression::determining_types() | |
9981 | { | |
9982 | if (this->types_are_determined_) | |
9983 | return false; | |
9984 | else | |
9985 | { | |
9986 | this->types_are_determined_ = true; | |
9987 | return true; | |
9988 | } | |
9989 | } | |
9990 | ||
e440a328 | 9991 | // Check types for parameter I. |
9992 | ||
9993 | bool | |
9994 | Call_expression::check_argument_type(int i, const Type* parameter_type, | |
9995 | const Type* argument_type, | |
b13c66cd | 9996 | Location argument_location, |
e440a328 | 9997 | bool issued_error) |
9998 | { | |
9999 | std::string reason; | |
1eae365b | 10000 | if (!Type::are_assignable(parameter_type, argument_type, &reason)) |
e440a328 | 10001 | { |
10002 | if (!issued_error) | |
10003 | { | |
10004 | if (reason.empty()) | |
631d5788 | 10005 | go_error_at(argument_location, "argument %d has incompatible type", i); |
e440a328 | 10006 | else |
631d5788 | 10007 | go_error_at(argument_location, |
10008 | "argument %d has incompatible type (%s)", | |
10009 | i, reason.c_str()); | |
e440a328 | 10010 | } |
10011 | this->set_is_error(); | |
10012 | return false; | |
10013 | } | |
10014 | return true; | |
10015 | } | |
10016 | ||
10017 | // Check types. | |
10018 | ||
10019 | void | |
10020 | Call_expression::do_check_types(Gogo*) | |
10021 | { | |
a6645f74 | 10022 | if (this->classification() == EXPRESSION_ERROR) |
10023 | return; | |
10024 | ||
e440a328 | 10025 | Function_type* fntype = this->get_function_type(); |
10026 | if (fntype == NULL) | |
10027 | { | |
5c13bd80 | 10028 | if (!this->fn_->type()->is_error()) |
e440a328 | 10029 | this->report_error(_("expected function")); |
10030 | return; | |
10031 | } | |
10032 | ||
1373401e | 10033 | if (this->expected_result_count_ != 0 |
10034 | && this->expected_result_count_ != this->result_count()) | |
10035 | { | |
10036 | if (this->issue_error()) | |
10037 | this->report_error(_("function result count mismatch")); | |
10038 | this->set_is_error(); | |
10039 | return; | |
10040 | } | |
10041 | ||
09ea332d | 10042 | bool is_method = fntype->is_method(); |
10043 | if (is_method) | |
e440a328 | 10044 | { |
09ea332d | 10045 | go_assert(this->args_ != NULL && !this->args_->empty()); |
10046 | Type* rtype = fntype->receiver()->type(); | |
10047 | Expression* first_arg = this->args_->front(); | |
1eae365b | 10048 | // We dereference the values since receivers are always passed |
10049 | // as pointers. | |
09ea332d | 10050 | std::string reason; |
1eae365b | 10051 | if (!Type::are_assignable(rtype->deref(), first_arg->type()->deref(), |
10052 | &reason)) | |
e440a328 | 10053 | { |
09ea332d | 10054 | if (reason.empty()) |
10055 | this->report_error(_("incompatible type for receiver")); | |
10056 | else | |
e440a328 | 10057 | { |
631d5788 | 10058 | go_error_at(this->location(), |
10059 | "incompatible type for receiver (%s)", | |
10060 | reason.c_str()); | |
09ea332d | 10061 | this->set_is_error(); |
e440a328 | 10062 | } |
10063 | } | |
10064 | } | |
10065 | ||
10066 | // Note that varargs was handled by the lower_varargs() method, so | |
a6645f74 | 10067 | // we don't have to worry about it here unless something is wrong. |
10068 | if (this->is_varargs_ && !this->varargs_are_lowered_) | |
10069 | { | |
10070 | if (!fntype->is_varargs()) | |
10071 | { | |
631d5788 | 10072 | go_error_at(this->location(), |
10073 | _("invalid use of %<...%> calling non-variadic function")); | |
a6645f74 | 10074 | this->set_is_error(); |
10075 | return; | |
10076 | } | |
10077 | } | |
e440a328 | 10078 | |
10079 | const Typed_identifier_list* parameters = fntype->parameters(); | |
10080 | if (this->args_ == NULL) | |
10081 | { | |
10082 | if (parameters != NULL && !parameters->empty()) | |
10083 | this->report_error(_("not enough arguments")); | |
10084 | } | |
10085 | else if (parameters == NULL) | |
09ea332d | 10086 | { |
10087 | if (!is_method || this->args_->size() > 1) | |
10088 | this->report_error(_("too many arguments")); | |
10089 | } | |
1373401e | 10090 | else if (this->args_->size() == 1 |
10091 | && this->args_->front()->call_expression() != NULL | |
10092 | && this->args_->front()->call_expression()->result_count() > 1) | |
10093 | { | |
10094 | // This is F(G()) when G returns more than one result. If the | |
10095 | // results can be matched to parameters, it would have been | |
10096 | // lowered in do_lower. If we get here we know there is a | |
10097 | // mismatch. | |
10098 | if (this->args_->front()->call_expression()->result_count() | |
10099 | < parameters->size()) | |
10100 | this->report_error(_("not enough arguments")); | |
10101 | else | |
10102 | this->report_error(_("too many arguments")); | |
10103 | } | |
e440a328 | 10104 | else |
10105 | { | |
10106 | int i = 0; | |
09ea332d | 10107 | Expression_list::const_iterator pa = this->args_->begin(); |
10108 | if (is_method) | |
10109 | ++pa; | |
10110 | for (Typed_identifier_list::const_iterator pt = parameters->begin(); | |
10111 | pt != parameters->end(); | |
10112 | ++pt, ++pa, ++i) | |
e440a328 | 10113 | { |
09ea332d | 10114 | if (pa == this->args_->end()) |
e440a328 | 10115 | { |
09ea332d | 10116 | this->report_error(_("not enough arguments")); |
e440a328 | 10117 | return; |
10118 | } | |
10119 | this->check_argument_type(i + 1, pt->type(), (*pa)->type(), | |
10120 | (*pa)->location(), false); | |
10121 | } | |
09ea332d | 10122 | if (pa != this->args_->end()) |
10123 | this->report_error(_("too many arguments")); | |
e440a328 | 10124 | } |
10125 | } | |
10126 | ||
72666aed | 10127 | Expression* |
10128 | Call_expression::do_copy() | |
10129 | { | |
10130 | Call_expression* call = | |
10131 | Expression::make_call(this->fn_->copy(), | |
10132 | (this->args_ == NULL | |
10133 | ? NULL | |
10134 | : this->args_->copy()), | |
10135 | this->is_varargs_, this->location()); | |
10136 | ||
10137 | if (this->varargs_are_lowered_) | |
10138 | call->set_varargs_are_lowered(); | |
10139 | return call; | |
10140 | } | |
10141 | ||
e440a328 | 10142 | // Return whether we have to use a temporary variable to ensure that |
10143 | // we evaluate this call expression in order. If the call returns no | |
ceeb4318 | 10144 | // results then it will inevitably be executed last. |
e440a328 | 10145 | |
10146 | bool | |
10147 | Call_expression::do_must_eval_in_order() const | |
10148 | { | |
ceeb4318 | 10149 | return this->result_count() > 0; |
e440a328 | 10150 | } |
10151 | ||
e440a328 | 10152 | // Get the function and the first argument to use when calling an |
10153 | // interface method. | |
10154 | ||
2387f644 | 10155 | Expression* |
e440a328 | 10156 | Call_expression::interface_method_function( |
e440a328 | 10157 | Interface_field_reference_expression* interface_method, |
db122cb9 | 10158 | Expression** first_arg_ptr, |
10159 | Location location) | |
e440a328 | 10160 | { |
db122cb9 | 10161 | Expression* object = interface_method->get_underlying_object(); |
10162 | Type* unsafe_ptr_type = Type::make_pointer_type(Type::make_void_type()); | |
10163 | *first_arg_ptr = | |
10164 | Expression::make_unsafe_cast(unsafe_ptr_type, object, location); | |
2387f644 | 10165 | return interface_method->get_function(); |
e440a328 | 10166 | } |
10167 | ||
10168 | // Build the call expression. | |
10169 | ||
ea664253 | 10170 | Bexpression* |
10171 | Call_expression::do_get_backend(Translate_context* context) | |
e440a328 | 10172 | { |
5731103c | 10173 | Location location = this->location(); |
10174 | ||
2c809f8f | 10175 | if (this->call_ != NULL) |
5731103c | 10176 | { |
10177 | // If the call returns multiple results, make a new reference to | |
10178 | // the temporary. | |
10179 | if (this->call_temp_ != NULL) | |
10180 | { | |
10181 | Expression* ref = | |
10182 | Expression::make_temporary_reference(this->call_temp_, location); | |
10183 | return ref->get_backend(context); | |
10184 | } | |
10185 | ||
10186 | return this->call_; | |
10187 | } | |
e440a328 | 10188 | |
10189 | Function_type* fntype = this->get_function_type(); | |
10190 | if (fntype == NULL) | |
ea664253 | 10191 | return context->backend()->error_expression(); |
e440a328 | 10192 | |
10193 | if (this->fn_->is_error_expression()) | |
ea664253 | 10194 | return context->backend()->error_expression(); |
e440a328 | 10195 | |
10196 | Gogo* gogo = context->gogo(); | |
e440a328 | 10197 | |
10198 | Func_expression* func = this->fn_->func_expression(); | |
e440a328 | 10199 | Interface_field_reference_expression* interface_method = |
10200 | this->fn_->interface_field_reference_expression(); | |
10201 | const bool has_closure = func != NULL && func->closure() != NULL; | |
09ea332d | 10202 | const bool is_interface_method = interface_method != NULL; |
e440a328 | 10203 | |
f8bdf81a | 10204 | bool has_closure_arg; |
8381eda7 | 10205 | if (has_closure) |
f8bdf81a | 10206 | has_closure_arg = true; |
8381eda7 | 10207 | else if (func != NULL) |
f8bdf81a | 10208 | has_closure_arg = false; |
8381eda7 | 10209 | else if (is_interface_method) |
f8bdf81a | 10210 | has_closure_arg = false; |
8381eda7 | 10211 | else |
f8bdf81a | 10212 | has_closure_arg = true; |
8381eda7 | 10213 | |
e440a328 | 10214 | int nargs; |
2c809f8f | 10215 | std::vector<Bexpression*> fn_args; |
e440a328 | 10216 | if (this->args_ == NULL || this->args_->empty()) |
10217 | { | |
f8bdf81a | 10218 | nargs = is_interface_method ? 1 : 0; |
2c809f8f | 10219 | if (nargs > 0) |
10220 | fn_args.resize(1); | |
e440a328 | 10221 | } |
09ea332d | 10222 | else if (fntype->parameters() == NULL || fntype->parameters()->empty()) |
10223 | { | |
10224 | // Passing a receiver parameter. | |
10225 | go_assert(!is_interface_method | |
10226 | && fntype->is_method() | |
10227 | && this->args_->size() == 1); | |
f8bdf81a | 10228 | nargs = 1; |
2c809f8f | 10229 | fn_args.resize(1); |
ea664253 | 10230 | fn_args[0] = this->args_->front()->get_backend(context); |
09ea332d | 10231 | } |
e440a328 | 10232 | else |
10233 | { | |
10234 | const Typed_identifier_list* params = fntype->parameters(); | |
e440a328 | 10235 | |
10236 | nargs = this->args_->size(); | |
09ea332d | 10237 | int i = is_interface_method ? 1 : 0; |
e440a328 | 10238 | nargs += i; |
2c809f8f | 10239 | fn_args.resize(nargs); |
e440a328 | 10240 | |
10241 | Typed_identifier_list::const_iterator pp = params->begin(); | |
09ea332d | 10242 | Expression_list::const_iterator pe = this->args_->begin(); |
10243 | if (!is_interface_method && fntype->is_method()) | |
10244 | { | |
ea664253 | 10245 | fn_args[i] = (*pe)->get_backend(context); |
09ea332d | 10246 | ++pe; |
10247 | ++i; | |
10248 | } | |
10249 | for (; pe != this->args_->end(); ++pe, ++pp, ++i) | |
e440a328 | 10250 | { |
c484d925 | 10251 | go_assert(pp != params->end()); |
2c809f8f | 10252 | Expression* arg = |
10253 | Expression::convert_for_assignment(gogo, pp->type(), *pe, | |
10254 | location); | |
ea664253 | 10255 | fn_args[i] = arg->get_backend(context); |
e440a328 | 10256 | } |
c484d925 | 10257 | go_assert(pp == params->end()); |
f8bdf81a | 10258 | go_assert(i == nargs); |
e440a328 | 10259 | } |
10260 | ||
2c809f8f | 10261 | Expression* fn; |
10262 | Expression* closure = NULL; | |
8381eda7 | 10263 | if (func != NULL) |
10264 | { | |
10265 | Named_object* no = func->named_object(); | |
2c809f8f | 10266 | fn = Expression::make_func_code_reference(no, location); |
10267 | if (has_closure) | |
10268 | closure = func->closure(); | |
8381eda7 | 10269 | } |
09ea332d | 10270 | else if (!is_interface_method) |
8381eda7 | 10271 | { |
2c809f8f | 10272 | closure = this->fn_; |
10273 | ||
10274 | // The backend representation of this function type is a pointer | |
10275 | // to a struct whose first field is the actual function to call. | |
10276 | Type* pfntype = | |
10277 | Type::make_pointer_type( | |
10278 | Type::make_pointer_type(Type::make_void_type())); | |
10279 | fn = Expression::make_unsafe_cast(pfntype, this->fn_, location); | |
10280 | fn = Expression::make_unary(OPERATOR_MULT, fn, location); | |
10281 | } | |
e440a328 | 10282 | else |
cf609de4 | 10283 | { |
2387f644 | 10284 | Expression* first_arg; |
db122cb9 | 10285 | fn = this->interface_method_function(interface_method, &first_arg, |
10286 | location); | |
ea664253 | 10287 | fn_args[0] = first_arg->get_backend(context); |
e440a328 | 10288 | } |
10289 | ||
1ecc6157 | 10290 | Bexpression* bclosure = NULL; |
10291 | if (has_closure_arg) | |
10292 | bclosure = closure->get_backend(context); | |
f8bdf81a | 10293 | else |
1ecc6157 | 10294 | go_assert(closure == NULL); |
f8bdf81a | 10295 | |
ea664253 | 10296 | Bexpression* bfn = fn->get_backend(context); |
80d1e1a8 | 10297 | |
10298 | // When not calling a named function directly, use a type conversion | |
10299 | // in case the type of the function is a recursive type which refers | |
10300 | // to itself. We don't do this for an interface method because 1) | |
10301 | // an interface method never refers to itself, so we always have a | |
10302 | // function type here; 2) we pass an extra first argument to an | |
10303 | // interface method, so fntype is not correct. | |
10304 | if (func == NULL && !is_interface_method) | |
10305 | { | |
10306 | Btype* bft = fntype->get_backend_fntype(gogo); | |
10307 | bfn = gogo->backend()->convert_expression(bft, bfn, location); | |
10308 | } | |
10309 | ||
4ced7af9 | 10310 | Bfunction* bfunction = NULL; |
10311 | if (context->function()) | |
10312 | bfunction = context->function()->func_value()->get_decl(); | |
10313 | Bexpression* call = gogo->backend()->call_expression(bfunction, bfn, | |
10314 | fn_args, bclosure, | |
10315 | location); | |
e440a328 | 10316 | |
5731103c | 10317 | if (this->call_temp_ != NULL) |
e440a328 | 10318 | { |
5731103c | 10319 | // This case occurs when the call returns multiple results. |
e440a328 | 10320 | |
5731103c | 10321 | Expression* ref = Expression::make_temporary_reference(this->call_temp_, |
10322 | location); | |
10323 | Bexpression* bref = ref->get_backend(context); | |
10324 | Bstatement* bassn = gogo->backend()->assignment_statement(bfunction, | |
10325 | bref, call, | |
10326 | location); | |
e440a328 | 10327 | |
5731103c | 10328 | ref = Expression::make_temporary_reference(this->call_temp_, location); |
10329 | this->call_ = ref->get_backend(context); | |
10330 | ||
10331 | return gogo->backend()->compound_expression(bassn, this->call_, | |
10332 | location); | |
2c809f8f | 10333 | } |
e440a328 | 10334 | |
2c809f8f | 10335 | this->call_ = call; |
ea664253 | 10336 | return this->call_; |
e440a328 | 10337 | } |
10338 | ||
d751bb78 | 10339 | // Dump ast representation for a call expressin. |
10340 | ||
10341 | void | |
10342 | Call_expression::do_dump_expression(Ast_dump_context* ast_dump_context) const | |
10343 | { | |
10344 | this->fn_->dump_expression(ast_dump_context); | |
10345 | ast_dump_context->ostream() << "("; | |
10346 | if (args_ != NULL) | |
10347 | ast_dump_context->dump_expression_list(this->args_); | |
10348 | ||
10349 | ast_dump_context->ostream() << ") "; | |
10350 | } | |
10351 | ||
e440a328 | 10352 | // Make a call expression. |
10353 | ||
10354 | Call_expression* | |
10355 | Expression::make_call(Expression* fn, Expression_list* args, bool is_varargs, | |
b13c66cd | 10356 | Location location) |
e440a328 | 10357 | { |
10358 | return new Call_expression(fn, args, is_varargs, location); | |
10359 | } | |
10360 | ||
da244e59 | 10361 | // Class Call_result_expression. |
e440a328 | 10362 | |
10363 | // Traverse a call result. | |
10364 | ||
10365 | int | |
10366 | Call_result_expression::do_traverse(Traverse* traverse) | |
10367 | { | |
10368 | if (traverse->remember_expression(this->call_)) | |
10369 | { | |
10370 | // We have already traversed the call expression. | |
10371 | return TRAVERSE_CONTINUE; | |
10372 | } | |
10373 | return Expression::traverse(&this->call_, traverse); | |
10374 | } | |
10375 | ||
10376 | // Get the type. | |
10377 | ||
10378 | Type* | |
10379 | Call_result_expression::do_type() | |
10380 | { | |
425dd051 | 10381 | if (this->classification() == EXPRESSION_ERROR) |
10382 | return Type::make_error_type(); | |
10383 | ||
e440a328 | 10384 | // THIS->CALL_ can be replaced with a temporary reference due to |
10385 | // Call_expression::do_must_eval_in_order when there is an error. | |
10386 | Call_expression* ce = this->call_->call_expression(); | |
10387 | if (ce == NULL) | |
5e85f268 | 10388 | { |
10389 | this->set_is_error(); | |
10390 | return Type::make_error_type(); | |
10391 | } | |
e440a328 | 10392 | Function_type* fntype = ce->get_function_type(); |
10393 | if (fntype == NULL) | |
5e85f268 | 10394 | { |
e37658e2 | 10395 | if (ce->issue_error()) |
99b3f06f | 10396 | { |
10397 | if (!ce->fn()->type()->is_error()) | |
10398 | this->report_error(_("expected function")); | |
10399 | } | |
5e85f268 | 10400 | this->set_is_error(); |
10401 | return Type::make_error_type(); | |
10402 | } | |
e440a328 | 10403 | const Typed_identifier_list* results = fntype->results(); |
ceeb4318 | 10404 | if (results == NULL || results->size() < 2) |
7b8d861f | 10405 | { |
ceeb4318 | 10406 | if (ce->issue_error()) |
10407 | this->report_error(_("number of results does not match " | |
10408 | "number of values")); | |
7b8d861f | 10409 | return Type::make_error_type(); |
10410 | } | |
e440a328 | 10411 | Typed_identifier_list::const_iterator pr = results->begin(); |
10412 | for (unsigned int i = 0; i < this->index_; ++i) | |
10413 | { | |
10414 | if (pr == results->end()) | |
425dd051 | 10415 | break; |
e440a328 | 10416 | ++pr; |
10417 | } | |
10418 | if (pr == results->end()) | |
425dd051 | 10419 | { |
ceeb4318 | 10420 | if (ce->issue_error()) |
10421 | this->report_error(_("number of results does not match " | |
10422 | "number of values")); | |
425dd051 | 10423 | return Type::make_error_type(); |
10424 | } | |
e440a328 | 10425 | return pr->type(); |
10426 | } | |
10427 | ||
425dd051 | 10428 | // Check the type. Just make sure that we trigger the warning in |
10429 | // do_type. | |
e440a328 | 10430 | |
10431 | void | |
10432 | Call_result_expression::do_check_types(Gogo*) | |
10433 | { | |
425dd051 | 10434 | this->type(); |
e440a328 | 10435 | } |
10436 | ||
10437 | // Determine the type. We have nothing to do here, but the 0 result | |
10438 | // needs to pass down to the caller. | |
10439 | ||
10440 | void | |
10441 | Call_result_expression::do_determine_type(const Type_context*) | |
10442 | { | |
fb94b0ca | 10443 | this->call_->determine_type_no_context(); |
e440a328 | 10444 | } |
10445 | ||
ea664253 | 10446 | // Return the backend representation. We just refer to the temporary set by the |
10447 | // call expression. We don't do this at lowering time because it makes it | |
ceeb4318 | 10448 | // hard to evaluate the call at the right time. |
e440a328 | 10449 | |
ea664253 | 10450 | Bexpression* |
10451 | Call_result_expression::do_get_backend(Translate_context* context) | |
e440a328 | 10452 | { |
ceeb4318 | 10453 | Call_expression* ce = this->call_->call_expression(); |
cd238b8d | 10454 | if (ce == NULL) |
10455 | { | |
10456 | go_assert(this->call_->is_error_expression()); | |
ea664253 | 10457 | return context->backend()->error_expression(); |
cd238b8d | 10458 | } |
5731103c | 10459 | Temporary_statement* ts = ce->results(); |
cd238b8d | 10460 | if (ts == NULL) |
10461 | { | |
10462 | go_assert(saw_errors()); | |
ea664253 | 10463 | return context->backend()->error_expression(); |
cd238b8d | 10464 | } |
ceeb4318 | 10465 | Expression* ref = Expression::make_temporary_reference(ts, this->location()); |
5731103c | 10466 | ref = Expression::make_field_reference(ref, this->index_, this->location()); |
ea664253 | 10467 | return ref->get_backend(context); |
e440a328 | 10468 | } |
10469 | ||
d751bb78 | 10470 | // Dump ast representation for a call result expression. |
10471 | ||
10472 | void | |
10473 | Call_result_expression::do_dump_expression(Ast_dump_context* ast_dump_context) | |
10474 | const | |
10475 | { | |
10476 | // FIXME: Wouldn't it be better if the call is assigned to a temporary | |
10477 | // (struct) and the fields are referenced instead. | |
10478 | ast_dump_context->ostream() << this->index_ << "@("; | |
10479 | ast_dump_context->dump_expression(this->call_); | |
10480 | ast_dump_context->ostream() << ")"; | |
10481 | } | |
10482 | ||
e440a328 | 10483 | // Make a reference to a single result of a call which returns |
10484 | // multiple results. | |
10485 | ||
10486 | Expression* | |
10487 | Expression::make_call_result(Call_expression* call, unsigned int index) | |
10488 | { | |
10489 | return new Call_result_expression(call, index); | |
10490 | } | |
10491 | ||
10492 | // Class Index_expression. | |
10493 | ||
10494 | // Traversal. | |
10495 | ||
10496 | int | |
10497 | Index_expression::do_traverse(Traverse* traverse) | |
10498 | { | |
10499 | if (Expression::traverse(&this->left_, traverse) == TRAVERSE_EXIT | |
10500 | || Expression::traverse(&this->start_, traverse) == TRAVERSE_EXIT | |
10501 | || (this->end_ != NULL | |
acf2b673 | 10502 | && Expression::traverse(&this->end_, traverse) == TRAVERSE_EXIT) |
10503 | || (this->cap_ != NULL | |
10504 | && Expression::traverse(&this->cap_, traverse) == TRAVERSE_EXIT)) | |
e440a328 | 10505 | return TRAVERSE_EXIT; |
10506 | return TRAVERSE_CONTINUE; | |
10507 | } | |
10508 | ||
10509 | // Lower an index expression. This converts the generic index | |
10510 | // expression into an array index, a string index, or a map index. | |
10511 | ||
10512 | Expression* | |
ceeb4318 | 10513 | Index_expression::do_lower(Gogo*, Named_object*, Statement_inserter*, int) |
e440a328 | 10514 | { |
b13c66cd | 10515 | Location location = this->location(); |
e440a328 | 10516 | Expression* left = this->left_; |
10517 | Expression* start = this->start_; | |
10518 | Expression* end = this->end_; | |
acf2b673 | 10519 | Expression* cap = this->cap_; |
e440a328 | 10520 | |
10521 | Type* type = left->type(); | |
5c13bd80 | 10522 | if (type->is_error()) |
d9f3743a | 10523 | { |
10524 | go_assert(saw_errors()); | |
10525 | return Expression::make_error(location); | |
10526 | } | |
b0cf7ddd | 10527 | else if (left->is_type_expression()) |
10528 | { | |
631d5788 | 10529 | go_error_at(location, "attempt to index type expression"); |
b0cf7ddd | 10530 | return Expression::make_error(location); |
10531 | } | |
e440a328 | 10532 | else if (type->array_type() != NULL) |
acf2b673 | 10533 | return Expression::make_array_index(left, start, end, cap, location); |
e440a328 | 10534 | else if (type->points_to() != NULL |
10535 | && type->points_to()->array_type() != NULL | |
411eb89e | 10536 | && !type->points_to()->is_slice_type()) |
e440a328 | 10537 | { |
10538 | Expression* deref = Expression::make_unary(OPERATOR_MULT, left, | |
10539 | location); | |
38092374 | 10540 | |
10541 | // For an ordinary index into the array, the pointer will be | |
10542 | // dereferenced. For a slice it will not--the resulting slice | |
10543 | // will simply reuse the pointer, which is incorrect if that | |
10544 | // pointer is nil. | |
10545 | if (end != NULL || cap != NULL) | |
10546 | deref->issue_nil_check(); | |
10547 | ||
acf2b673 | 10548 | return Expression::make_array_index(deref, start, end, cap, location); |
e440a328 | 10549 | } |
10550 | else if (type->is_string_type()) | |
acf2b673 | 10551 | { |
10552 | if (cap != NULL) | |
10553 | { | |
631d5788 | 10554 | go_error_at(location, "invalid 3-index slice of string"); |
acf2b673 | 10555 | return Expression::make_error(location); |
10556 | } | |
10557 | return Expression::make_string_index(left, start, end, location); | |
10558 | } | |
e440a328 | 10559 | else if (type->map_type() != NULL) |
10560 | { | |
acf2b673 | 10561 | if (end != NULL || cap != NULL) |
e440a328 | 10562 | { |
631d5788 | 10563 | go_error_at(location, "invalid slice of map"); |
e440a328 | 10564 | return Expression::make_error(location); |
10565 | } | |
0d5530d9 | 10566 | return Expression::make_map_index(left, start, location); |
e440a328 | 10567 | } |
b1aba207 | 10568 | else if (cap != NULL) |
10569 | { | |
10570 | go_error_at(location, | |
10571 | "invalid 3-index slice of object that is not a slice"); | |
10572 | return Expression::make_error(location); | |
10573 | } | |
10574 | else if (end != NULL) | |
10575 | { | |
10576 | go_error_at(location, | |
10577 | ("attempt to slice object that is not " | |
10578 | "array, slice, or string")); | |
10579 | return Expression::make_error(location); | |
10580 | } | |
e440a328 | 10581 | else |
10582 | { | |
631d5788 | 10583 | go_error_at(location, |
b1aba207 | 10584 | ("attempt to index object that is not " |
10585 | "array, slice, string, or map")); | |
e440a328 | 10586 | return Expression::make_error(location); |
10587 | } | |
10588 | } | |
10589 | ||
acf2b673 | 10590 | // Write an indexed expression |
10591 | // (expr[expr:expr:expr], expr[expr:expr] or expr[expr]) to a dump context. | |
d751bb78 | 10592 | |
10593 | void | |
10594 | Index_expression::dump_index_expression(Ast_dump_context* ast_dump_context, | |
10595 | const Expression* expr, | |
10596 | const Expression* start, | |
acf2b673 | 10597 | const Expression* end, |
10598 | const Expression* cap) | |
d751bb78 | 10599 | { |
10600 | expr->dump_expression(ast_dump_context); | |
10601 | ast_dump_context->ostream() << "["; | |
10602 | start->dump_expression(ast_dump_context); | |
10603 | if (end != NULL) | |
10604 | { | |
10605 | ast_dump_context->ostream() << ":"; | |
10606 | end->dump_expression(ast_dump_context); | |
10607 | } | |
acf2b673 | 10608 | if (cap != NULL) |
10609 | { | |
10610 | ast_dump_context->ostream() << ":"; | |
10611 | cap->dump_expression(ast_dump_context); | |
10612 | } | |
d751bb78 | 10613 | ast_dump_context->ostream() << "]"; |
10614 | } | |
10615 | ||
10616 | // Dump ast representation for an index expression. | |
10617 | ||
10618 | void | |
10619 | Index_expression::do_dump_expression(Ast_dump_context* ast_dump_context) | |
10620 | const | |
10621 | { | |
10622 | Index_expression::dump_index_expression(ast_dump_context, this->left_, | |
acf2b673 | 10623 | this->start_, this->end_, this->cap_); |
d751bb78 | 10624 | } |
10625 | ||
e440a328 | 10626 | // Make an index expression. |
10627 | ||
10628 | Expression* | |
10629 | Expression::make_index(Expression* left, Expression* start, Expression* end, | |
acf2b673 | 10630 | Expression* cap, Location location) |
e440a328 | 10631 | { |
acf2b673 | 10632 | return new Index_expression(left, start, end, cap, location); |
e440a328 | 10633 | } |
10634 | ||
da244e59 | 10635 | // Class Array_index_expression. |
e440a328 | 10636 | |
10637 | // Array index traversal. | |
10638 | ||
10639 | int | |
10640 | Array_index_expression::do_traverse(Traverse* traverse) | |
10641 | { | |
10642 | if (Expression::traverse(&this->array_, traverse) == TRAVERSE_EXIT) | |
10643 | return TRAVERSE_EXIT; | |
10644 | if (Expression::traverse(&this->start_, traverse) == TRAVERSE_EXIT) | |
10645 | return TRAVERSE_EXIT; | |
10646 | if (this->end_ != NULL) | |
10647 | { | |
10648 | if (Expression::traverse(&this->end_, traverse) == TRAVERSE_EXIT) | |
10649 | return TRAVERSE_EXIT; | |
10650 | } | |
acf2b673 | 10651 | if (this->cap_ != NULL) |
10652 | { | |
10653 | if (Expression::traverse(&this->cap_, traverse) == TRAVERSE_EXIT) | |
10654 | return TRAVERSE_EXIT; | |
10655 | } | |
e440a328 | 10656 | return TRAVERSE_CONTINUE; |
10657 | } | |
10658 | ||
10659 | // Return the type of an array index. | |
10660 | ||
10661 | Type* | |
10662 | Array_index_expression::do_type() | |
10663 | { | |
10664 | if (this->type_ == NULL) | |
10665 | { | |
10666 | Array_type* type = this->array_->type()->array_type(); | |
10667 | if (type == NULL) | |
10668 | this->type_ = Type::make_error_type(); | |
10669 | else if (this->end_ == NULL) | |
10670 | this->type_ = type->element_type(); | |
411eb89e | 10671 | else if (type->is_slice_type()) |
e440a328 | 10672 | { |
10673 | // A slice of a slice has the same type as the original | |
10674 | // slice. | |
10675 | this->type_ = this->array_->type()->deref(); | |
10676 | } | |
10677 | else | |
10678 | { | |
10679 | // A slice of an array is a slice. | |
10680 | this->type_ = Type::make_array_type(type->element_type(), NULL); | |
10681 | } | |
10682 | } | |
10683 | return this->type_; | |
10684 | } | |
10685 | ||
10686 | // Set the type of an array index. | |
10687 | ||
10688 | void | |
10689 | Array_index_expression::do_determine_type(const Type_context*) | |
10690 | { | |
10691 | this->array_->determine_type_no_context(); | |
f77aa642 | 10692 | |
10693 | Type_context index_context(Type::lookup_integer_type("int"), false); | |
10694 | if (this->start_->is_constant()) | |
10695 | this->start_->determine_type(&index_context); | |
10696 | else | |
10697 | this->start_->determine_type_no_context(); | |
e440a328 | 10698 | if (this->end_ != NULL) |
f77aa642 | 10699 | { |
10700 | if (this->end_->is_constant()) | |
10701 | this->end_->determine_type(&index_context); | |
10702 | else | |
10703 | this->end_->determine_type_no_context(); | |
10704 | } | |
acf2b673 | 10705 | if (this->cap_ != NULL) |
f77aa642 | 10706 | { |
10707 | if (this->cap_->is_constant()) | |
10708 | this->cap_->determine_type(&index_context); | |
10709 | else | |
10710 | this->cap_->determine_type_no_context(); | |
10711 | } | |
e440a328 | 10712 | } |
10713 | ||
10714 | // Check types of an array index. | |
10715 | ||
10716 | void | |
d0a50ed8 | 10717 | Array_index_expression::do_check_types(Gogo* gogo) |
e440a328 | 10718 | { |
f6bc81e6 | 10719 | Numeric_constant nc; |
10720 | unsigned long v; | |
10721 | if (this->start_->type()->integer_type() == NULL | |
10722 | && !this->start_->type()->is_error() | |
10723 | && (!this->start_->numeric_constant_value(&nc) | |
10724 | || nc.to_unsigned_long(&v) == Numeric_constant::NC_UL_NOTINT)) | |
e440a328 | 10725 | this->report_error(_("index must be integer")); |
10726 | if (this->end_ != NULL | |
10727 | && this->end_->type()->integer_type() == NULL | |
99b3f06f | 10728 | && !this->end_->type()->is_error() |
10729 | && !this->end_->is_nil_expression() | |
f6bc81e6 | 10730 | && !this->end_->is_error_expression() |
10731 | && (!this->end_->numeric_constant_value(&nc) | |
10732 | || nc.to_unsigned_long(&v) == Numeric_constant::NC_UL_NOTINT)) | |
e440a328 | 10733 | this->report_error(_("slice end must be integer")); |
acf2b673 | 10734 | if (this->cap_ != NULL |
10735 | && this->cap_->type()->integer_type() == NULL | |
10736 | && !this->cap_->type()->is_error() | |
10737 | && !this->cap_->is_nil_expression() | |
10738 | && !this->cap_->is_error_expression() | |
10739 | && (!this->cap_->numeric_constant_value(&nc) | |
10740 | || nc.to_unsigned_long(&v) == Numeric_constant::NC_UL_NOTINT)) | |
10741 | this->report_error(_("slice capacity must be integer")); | |
e440a328 | 10742 | |
10743 | Array_type* array_type = this->array_->type()->array_type(); | |
f9c68f17 | 10744 | if (array_type == NULL) |
10745 | { | |
c484d925 | 10746 | go_assert(this->array_->type()->is_error()); |
f9c68f17 | 10747 | return; |
10748 | } | |
e440a328 | 10749 | |
10750 | unsigned int int_bits = | |
10751 | Type::lookup_integer_type("int")->integer_type()->bits(); | |
10752 | ||
0c77715b | 10753 | Numeric_constant lvalnc; |
e440a328 | 10754 | mpz_t lval; |
e440a328 | 10755 | bool lval_valid = (array_type->length() != NULL |
0c77715b | 10756 | && array_type->length()->numeric_constant_value(&lvalnc) |
10757 | && lvalnc.to_int(&lval)); | |
10758 | Numeric_constant inc; | |
e440a328 | 10759 | mpz_t ival; |
0bd5d859 | 10760 | bool ival_valid = false; |
0c77715b | 10761 | if (this->start_->numeric_constant_value(&inc) && inc.to_int(&ival)) |
e440a328 | 10762 | { |
0bd5d859 | 10763 | ival_valid = true; |
e440a328 | 10764 | if (mpz_sgn(ival) < 0 |
10765 | || mpz_sizeinbase(ival, 2) >= int_bits | |
10766 | || (lval_valid | |
10767 | && (this->end_ == NULL | |
10768 | ? mpz_cmp(ival, lval) >= 0 | |
10769 | : mpz_cmp(ival, lval) > 0))) | |
10770 | { | |
631d5788 | 10771 | go_error_at(this->start_->location(), "array index out of bounds"); |
e440a328 | 10772 | this->set_is_error(); |
10773 | } | |
10774 | } | |
10775 | if (this->end_ != NULL && !this->end_->is_nil_expression()) | |
10776 | { | |
0c77715b | 10777 | Numeric_constant enc; |
10778 | mpz_t eval; | |
acf2b673 | 10779 | bool eval_valid = false; |
0c77715b | 10780 | if (this->end_->numeric_constant_value(&enc) && enc.to_int(&eval)) |
e440a328 | 10781 | { |
acf2b673 | 10782 | eval_valid = true; |
0c77715b | 10783 | if (mpz_sgn(eval) < 0 |
10784 | || mpz_sizeinbase(eval, 2) >= int_bits | |
10785 | || (lval_valid && mpz_cmp(eval, lval) > 0)) | |
e440a328 | 10786 | { |
631d5788 | 10787 | go_error_at(this->end_->location(), "array index out of bounds"); |
e440a328 | 10788 | this->set_is_error(); |
10789 | } | |
0bd5d859 | 10790 | else if (ival_valid && mpz_cmp(ival, eval) > 0) |
10791 | this->report_error(_("inverted slice range")); | |
e440a328 | 10792 | } |
acf2b673 | 10793 | |
10794 | Numeric_constant cnc; | |
10795 | mpz_t cval; | |
10796 | if (this->cap_ != NULL | |
10797 | && this->cap_->numeric_constant_value(&cnc) && cnc.to_int(&cval)) | |
10798 | { | |
10799 | if (mpz_sgn(cval) < 0 | |
10800 | || mpz_sizeinbase(cval, 2) >= int_bits | |
10801 | || (lval_valid && mpz_cmp(cval, lval) > 0)) | |
10802 | { | |
631d5788 | 10803 | go_error_at(this->cap_->location(), "array index out of bounds"); |
acf2b673 | 10804 | this->set_is_error(); |
10805 | } | |
10806 | else if (ival_valid && mpz_cmp(ival, cval) > 0) | |
10807 | { | |
631d5788 | 10808 | go_error_at(this->cap_->location(), |
10809 | "invalid slice index: capacity less than start"); | |
acf2b673 | 10810 | this->set_is_error(); |
10811 | } | |
10812 | else if (eval_valid && mpz_cmp(eval, cval) > 0) | |
10813 | { | |
631d5788 | 10814 | go_error_at(this->cap_->location(), |
10815 | "invalid slice index: capacity less than length"); | |
acf2b673 | 10816 | this->set_is_error(); |
10817 | } | |
10818 | mpz_clear(cval); | |
10819 | } | |
10820 | ||
10821 | if (eval_valid) | |
10822 | mpz_clear(eval); | |
e440a328 | 10823 | } |
0bd5d859 | 10824 | if (ival_valid) |
10825 | mpz_clear(ival); | |
0c77715b | 10826 | if (lval_valid) |
10827 | mpz_clear(lval); | |
e440a328 | 10828 | |
10829 | // A slice of an array requires an addressable array. A slice of a | |
10830 | // slice is always possible. | |
411eb89e | 10831 | if (this->end_ != NULL && !array_type->is_slice_type()) |
88ec30c8 | 10832 | { |
10833 | if (!this->array_->is_addressable()) | |
8da39c3b | 10834 | this->report_error(_("slice of unaddressable value")); |
88ec30c8 | 10835 | else |
d0a50ed8 | 10836 | { |
10837 | bool escapes = true; | |
10838 | ||
10839 | // When compiling the runtime, a slice operation does not | |
10840 | // cause local variables to escape. When escape analysis | |
10841 | // becomes the default, this should be changed to make it an | |
10842 | // error if we have a slice operation that escapes. | |
10843 | if (gogo->compiling_runtime() && gogo->package_name() == "runtime") | |
10844 | escapes = false; | |
10845 | ||
10846 | this->array_->address_taken(escapes); | |
10847 | } | |
88ec30c8 | 10848 | } |
e440a328 | 10849 | } |
10850 | ||
2c809f8f | 10851 | // Flatten array indexing by using temporary variables for slices and indexes. |
35a54f17 | 10852 | |
10853 | Expression* | |
10854 | Array_index_expression::do_flatten(Gogo*, Named_object*, | |
10855 | Statement_inserter* inserter) | |
10856 | { | |
10857 | Location loc = this->location(); | |
5bf8be8b | 10858 | Expression* array = this->array_; |
10859 | Expression* start = this->start_; | |
10860 | Expression* end = this->end_; | |
10861 | Expression* cap = this->cap_; | |
10862 | if (array->is_error_expression() | |
10863 | || array->type()->is_error_type() | |
10864 | || start->is_error_expression() | |
10865 | || start->type()->is_error_type() | |
10866 | || (end != NULL | |
10867 | && (end->is_error_expression() || end->type()->is_error_type())) | |
10868 | || (cap != NULL | |
10869 | && (cap->is_error_expression() || cap->type()->is_error_type()))) | |
10870 | { | |
10871 | go_assert(saw_errors()); | |
10872 | return Expression::make_error(loc); | |
10873 | } | |
10874 | ||
2c809f8f | 10875 | Temporary_statement* temp; |
5bf8be8b | 10876 | if (array->type()->is_slice_type() && !array->is_variable()) |
35a54f17 | 10877 | { |
5bf8be8b | 10878 | temp = Statement::make_temporary(NULL, array, loc); |
35a54f17 | 10879 | inserter->insert(temp); |
10880 | this->array_ = Expression::make_temporary_reference(temp, loc); | |
10881 | } | |
5bf8be8b | 10882 | if (!start->is_variable()) |
2c809f8f | 10883 | { |
5bf8be8b | 10884 | temp = Statement::make_temporary(NULL, start, loc); |
2c809f8f | 10885 | inserter->insert(temp); |
10886 | this->start_ = Expression::make_temporary_reference(temp, loc); | |
10887 | } | |
5bf8be8b | 10888 | if (end != NULL |
10889 | && !end->is_nil_expression() | |
10890 | && !end->is_variable()) | |
2c809f8f | 10891 | { |
5bf8be8b | 10892 | temp = Statement::make_temporary(NULL, end, loc); |
2c809f8f | 10893 | inserter->insert(temp); |
10894 | this->end_ = Expression::make_temporary_reference(temp, loc); | |
10895 | } | |
03118c21 | 10896 | if (cap != NULL && !cap->is_variable()) |
2c809f8f | 10897 | { |
5bf8be8b | 10898 | temp = Statement::make_temporary(NULL, cap, loc); |
2c809f8f | 10899 | inserter->insert(temp); |
10900 | this->cap_ = Expression::make_temporary_reference(temp, loc); | |
10901 | } | |
10902 | ||
35a54f17 | 10903 | return this; |
10904 | } | |
10905 | ||
e440a328 | 10906 | // Return whether this expression is addressable. |
10907 | ||
10908 | bool | |
10909 | Array_index_expression::do_is_addressable() const | |
10910 | { | |
10911 | // A slice expression is not addressable. | |
10912 | if (this->end_ != NULL) | |
10913 | return false; | |
10914 | ||
10915 | // An index into a slice is addressable. | |
411eb89e | 10916 | if (this->array_->type()->is_slice_type()) |
e440a328 | 10917 | return true; |
10918 | ||
10919 | // An index into an array is addressable if the array is | |
10920 | // addressable. | |
10921 | return this->array_->is_addressable(); | |
10922 | } | |
10923 | ||
ea664253 | 10924 | // Get the backend representation for an array index. |
e440a328 | 10925 | |
ea664253 | 10926 | Bexpression* |
10927 | Array_index_expression::do_get_backend(Translate_context* context) | |
e440a328 | 10928 | { |
e440a328 | 10929 | Array_type* array_type = this->array_->type()->array_type(); |
d8cd8e2d | 10930 | if (array_type == NULL) |
10931 | { | |
c484d925 | 10932 | go_assert(this->array_->type()->is_error()); |
ea664253 | 10933 | return context->backend()->error_expression(); |
d8cd8e2d | 10934 | } |
35a54f17 | 10935 | go_assert(!array_type->is_slice_type() || this->array_->is_variable()); |
e440a328 | 10936 | |
2c809f8f | 10937 | Location loc = this->location(); |
10938 | Gogo* gogo = context->gogo(); | |
10939 | ||
6dfedc16 | 10940 | Type* int_type = Type::lookup_integer_type("int"); |
10941 | Btype* int_btype = int_type->get_backend(gogo); | |
e440a328 | 10942 | |
2c809f8f | 10943 | // We need to convert the length and capacity to the Go "int" type here |
10944 | // because the length of a fixed-length array could be of type "uintptr" | |
10945 | // and gimple disallows binary operations between "uintptr" and other | |
10946 | // integer types. FIXME. | |
10947 | Bexpression* length = NULL; | |
a04bfdfc | 10948 | if (this->end_ == NULL || this->end_->is_nil_expression()) |
10949 | { | |
35a54f17 | 10950 | Expression* len = array_type->get_length(gogo, this->array_); |
ea664253 | 10951 | length = len->get_backend(context); |
2c809f8f | 10952 | length = gogo->backend()->convert_expression(int_btype, length, loc); |
a04bfdfc | 10953 | } |
10954 | ||
2c809f8f | 10955 | Bexpression* capacity = NULL; |
a04bfdfc | 10956 | if (this->end_ != NULL) |
10957 | { | |
35a54f17 | 10958 | Expression* cap = array_type->get_capacity(gogo, this->array_); |
ea664253 | 10959 | capacity = cap->get_backend(context); |
2c809f8f | 10960 | capacity = gogo->backend()->convert_expression(int_btype, capacity, loc); |
a04bfdfc | 10961 | } |
10962 | ||
2c809f8f | 10963 | Bexpression* cap_arg = capacity; |
acf2b673 | 10964 | if (this->cap_ != NULL) |
10965 | { | |
ea664253 | 10966 | cap_arg = this->cap_->get_backend(context); |
2c809f8f | 10967 | cap_arg = gogo->backend()->convert_expression(int_btype, cap_arg, loc); |
acf2b673 | 10968 | } |
10969 | ||
2c809f8f | 10970 | if (length == NULL) |
10971 | length = cap_arg; | |
e440a328 | 10972 | |
10973 | int code = (array_type->length() != NULL | |
10974 | ? (this->end_ == NULL | |
10975 | ? RUNTIME_ERROR_ARRAY_INDEX_OUT_OF_BOUNDS | |
10976 | : RUNTIME_ERROR_ARRAY_SLICE_OUT_OF_BOUNDS) | |
10977 | : (this->end_ == NULL | |
10978 | ? RUNTIME_ERROR_SLICE_INDEX_OUT_OF_BOUNDS | |
10979 | : RUNTIME_ERROR_SLICE_SLICE_OUT_OF_BOUNDS)); | |
ea664253 | 10980 | Bexpression* crash = gogo->runtime_error(code, loc)->get_backend(context); |
2c809f8f | 10981 | |
6dfedc16 | 10982 | if (this->start_->type()->integer_type() == NULL |
10983 | && !Type::are_convertible(int_type, this->start_->type(), NULL)) | |
10984 | { | |
10985 | go_assert(saw_errors()); | |
10986 | return context->backend()->error_expression(); | |
10987 | } | |
d9f3743a | 10988 | |
ea664253 | 10989 | Bexpression* bad_index = |
d9f3743a | 10990 | Expression::check_bounds(this->start_, loc)->get_backend(context); |
2c809f8f | 10991 | |
ea664253 | 10992 | Bexpression* start = this->start_->get_backend(context); |
2c809f8f | 10993 | start = gogo->backend()->convert_expression(int_btype, start, loc); |
10994 | Bexpression* start_too_large = | |
10995 | gogo->backend()->binary_expression((this->end_ == NULL | |
10996 | ? OPERATOR_GE | |
10997 | : OPERATOR_GT), | |
10998 | start, | |
10999 | (this->end_ == NULL | |
11000 | ? length | |
11001 | : capacity), | |
11002 | loc); | |
11003 | bad_index = gogo->backend()->binary_expression(OPERATOR_OROR, start_too_large, | |
11004 | bad_index, loc); | |
e440a328 | 11005 | |
93715b75 | 11006 | Bfunction* bfn = context->function()->func_value()->get_decl(); |
e440a328 | 11007 | if (this->end_ == NULL) |
11008 | { | |
11009 | // Simple array indexing. This has to return an l-value, so | |
2c809f8f | 11010 | // wrap the index check into START. |
11011 | start = | |
93715b75 | 11012 | gogo->backend()->conditional_expression(bfn, int_btype, bad_index, |
2c809f8f | 11013 | crash, start, loc); |
e440a328 | 11014 | |
2c809f8f | 11015 | Bexpression* ret; |
e440a328 | 11016 | if (array_type->length() != NULL) |
11017 | { | |
ea664253 | 11018 | Bexpression* array = this->array_->get_backend(context); |
2c809f8f | 11019 | ret = gogo->backend()->array_index_expression(array, start, loc); |
e440a328 | 11020 | } |
11021 | else | |
11022 | { | |
2c809f8f | 11023 | // Slice. |
11024 | Expression* valptr = | |
44dbe1d7 | 11025 | array_type->get_value_pointer(gogo, this->array_, |
11026 | this->is_lvalue_); | |
ea664253 | 11027 | Bexpression* ptr = valptr->get_backend(context); |
2c809f8f | 11028 | ptr = gogo->backend()->pointer_offset_expression(ptr, start, loc); |
9b27b43c | 11029 | |
11030 | Type* ele_type = this->array_->type()->array_type()->element_type(); | |
11031 | Btype* ele_btype = ele_type->get_backend(gogo); | |
11032 | ret = gogo->backend()->indirect_expression(ele_btype, ptr, true, loc); | |
e440a328 | 11033 | } |
ea664253 | 11034 | return ret; |
e440a328 | 11035 | } |
11036 | ||
11037 | // Array slice. | |
11038 | ||
acf2b673 | 11039 | if (this->cap_ != NULL) |
11040 | { | |
2c809f8f | 11041 | Bexpression* bounds_bcheck = |
ea664253 | 11042 | Expression::check_bounds(this->cap_, loc)->get_backend(context); |
2c809f8f | 11043 | bad_index = |
11044 | gogo->backend()->binary_expression(OPERATOR_OROR, bounds_bcheck, | |
11045 | bad_index, loc); | |
11046 | cap_arg = gogo->backend()->convert_expression(int_btype, cap_arg, loc); | |
11047 | ||
11048 | Bexpression* cap_too_small = | |
11049 | gogo->backend()->binary_expression(OPERATOR_LT, cap_arg, start, loc); | |
11050 | Bexpression* cap_too_large = | |
11051 | gogo->backend()->binary_expression(OPERATOR_GT, cap_arg, capacity, loc); | |
11052 | Bexpression* bad_cap = | |
11053 | gogo->backend()->binary_expression(OPERATOR_OROR, cap_too_small, | |
11054 | cap_too_large, loc); | |
11055 | bad_index = gogo->backend()->binary_expression(OPERATOR_OROR, bad_cap, | |
11056 | bad_index, loc); | |
11057 | } | |
11058 | ||
11059 | Bexpression* end; | |
e440a328 | 11060 | if (this->end_->is_nil_expression()) |
2c809f8f | 11061 | end = length; |
e440a328 | 11062 | else |
11063 | { | |
2c809f8f | 11064 | Bexpression* bounds_bcheck = |
ea664253 | 11065 | Expression::check_bounds(this->end_, loc)->get_backend(context); |
e440a328 | 11066 | |
2c809f8f | 11067 | bad_index = |
11068 | gogo->backend()->binary_expression(OPERATOR_OROR, bounds_bcheck, | |
11069 | bad_index, loc); | |
e440a328 | 11070 | |
ea664253 | 11071 | end = this->end_->get_backend(context); |
2c809f8f | 11072 | end = gogo->backend()->convert_expression(int_btype, end, loc); |
11073 | Bexpression* end_too_small = | |
11074 | gogo->backend()->binary_expression(OPERATOR_LT, end, start, loc); | |
11075 | Bexpression* end_too_large = | |
11076 | gogo->backend()->binary_expression(OPERATOR_GT, end, cap_arg, loc); | |
11077 | Bexpression* bad_end = | |
11078 | gogo->backend()->binary_expression(OPERATOR_OROR, end_too_small, | |
11079 | end_too_large, loc); | |
11080 | bad_index = gogo->backend()->binary_expression(OPERATOR_OROR, bad_end, | |
11081 | bad_index, loc); | |
e440a328 | 11082 | } |
11083 | ||
2c809f8f | 11084 | Bexpression* result_length = |
11085 | gogo->backend()->binary_expression(OPERATOR_MINUS, end, start, loc); | |
e440a328 | 11086 | |
2c809f8f | 11087 | Bexpression* result_capacity = |
11088 | gogo->backend()->binary_expression(OPERATOR_MINUS, cap_arg, start, loc); | |
e440a328 | 11089 | |
03118c21 | 11090 | // If the new capacity is zero, don't change val. Otherwise we can |
11091 | // get a pointer to the next object in memory, keeping it live | |
11092 | // unnecessarily. When the capacity is zero, the actual pointer | |
11093 | // value doesn't matter. | |
11094 | Bexpression* zero = | |
11095 | Expression::make_integer_ul(0, int_type, loc)->get_backend(context); | |
11096 | Bexpression* cond = | |
11097 | gogo->backend()->binary_expression(OPERATOR_EQEQ, result_capacity, zero, | |
11098 | loc); | |
11099 | Bexpression* offset = gogo->backend()->conditional_expression(bfn, int_btype, | |
11100 | cond, zero, | |
11101 | start, loc); | |
44dbe1d7 | 11102 | Expression* valptr = array_type->get_value_pointer(gogo, this->array_, |
11103 | this->is_lvalue_); | |
03118c21 | 11104 | Bexpression* val = valptr->get_backend(context); |
11105 | val = gogo->backend()->pointer_offset_expression(val, offset, loc); | |
11106 | ||
2c809f8f | 11107 | Btype* struct_btype = this->type()->get_backend(gogo); |
11108 | std::vector<Bexpression*> init; | |
11109 | init.push_back(val); | |
11110 | init.push_back(result_length); | |
11111 | init.push_back(result_capacity); | |
e440a328 | 11112 | |
2c809f8f | 11113 | Bexpression* ctor = |
11114 | gogo->backend()->constructor_expression(struct_btype, init, loc); | |
93715b75 | 11115 | return gogo->backend()->conditional_expression(bfn, struct_btype, bad_index, |
ea664253 | 11116 | crash, ctor, loc); |
e440a328 | 11117 | } |
11118 | ||
d751bb78 | 11119 | // Dump ast representation for an array index expression. |
11120 | ||
11121 | void | |
11122 | Array_index_expression::do_dump_expression(Ast_dump_context* ast_dump_context) | |
11123 | const | |
11124 | { | |
11125 | Index_expression::dump_index_expression(ast_dump_context, this->array_, | |
acf2b673 | 11126 | this->start_, this->end_, this->cap_); |
d751bb78 | 11127 | } |
11128 | ||
acf2b673 | 11129 | // Make an array index expression. END and CAP may be NULL. |
e440a328 | 11130 | |
11131 | Expression* | |
11132 | Expression::make_array_index(Expression* array, Expression* start, | |
acf2b673 | 11133 | Expression* end, Expression* cap, |
11134 | Location location) | |
e440a328 | 11135 | { |
acf2b673 | 11136 | return new Array_index_expression(array, start, end, cap, location); |
e440a328 | 11137 | } |
11138 | ||
50075d74 | 11139 | // Class String_index_expression. |
e440a328 | 11140 | |
11141 | // String index traversal. | |
11142 | ||
11143 | int | |
11144 | String_index_expression::do_traverse(Traverse* traverse) | |
11145 | { | |
11146 | if (Expression::traverse(&this->string_, traverse) == TRAVERSE_EXIT) | |
11147 | return TRAVERSE_EXIT; | |
11148 | if (Expression::traverse(&this->start_, traverse) == TRAVERSE_EXIT) | |
11149 | return TRAVERSE_EXIT; | |
11150 | if (this->end_ != NULL) | |
11151 | { | |
11152 | if (Expression::traverse(&this->end_, traverse) == TRAVERSE_EXIT) | |
11153 | return TRAVERSE_EXIT; | |
11154 | } | |
11155 | return TRAVERSE_CONTINUE; | |
11156 | } | |
11157 | ||
2c809f8f | 11158 | Expression* |
11159 | String_index_expression::do_flatten(Gogo*, Named_object*, | |
11160 | Statement_inserter* inserter) | |
e440a328 | 11161 | { |
2c809f8f | 11162 | Location loc = this->location(); |
5bf8be8b | 11163 | Expression* string = this->string_; |
11164 | Expression* start = this->start_; | |
11165 | Expression* end = this->end_; | |
11166 | if (string->is_error_expression() | |
11167 | || string->type()->is_error_type() | |
11168 | || start->is_error_expression() | |
11169 | || start->type()->is_error_type() | |
11170 | || (end != NULL | |
11171 | && (end->is_error_expression() || end->type()->is_error_type()))) | |
11172 | { | |
11173 | go_assert(saw_errors()); | |
11174 | return Expression::make_error(loc); | |
11175 | } | |
11176 | ||
11177 | Temporary_statement* temp; | |
2c809f8f | 11178 | if (!this->string_->is_variable()) |
11179 | { | |
11180 | temp = Statement::make_temporary(NULL, this->string_, loc); | |
11181 | inserter->insert(temp); | |
11182 | this->string_ = Expression::make_temporary_reference(temp, loc); | |
11183 | } | |
11184 | if (!this->start_->is_variable()) | |
11185 | { | |
11186 | temp = Statement::make_temporary(NULL, this->start_, loc); | |
11187 | inserter->insert(temp); | |
11188 | this->start_ = Expression::make_temporary_reference(temp, loc); | |
11189 | } | |
11190 | if (this->end_ != NULL | |
11191 | && !this->end_->is_nil_expression() | |
11192 | && !this->end_->is_variable()) | |
11193 | { | |
11194 | temp = Statement::make_temporary(NULL, this->end_, loc); | |
11195 | inserter->insert(temp); | |
11196 | this->end_ = Expression::make_temporary_reference(temp, loc); | |
11197 | } | |
11198 | ||
11199 | return this; | |
11200 | } | |
11201 | ||
11202 | // Return the type of a string index. | |
11203 | ||
11204 | Type* | |
11205 | String_index_expression::do_type() | |
11206 | { | |
11207 | if (this->end_ == NULL) | |
11208 | return Type::lookup_integer_type("uint8"); | |
11209 | else | |
11210 | return this->string_->type(); | |
11211 | } | |
11212 | ||
11213 | // Determine the type of a string index. | |
11214 | ||
11215 | void | |
11216 | String_index_expression::do_determine_type(const Type_context*) | |
11217 | { | |
11218 | this->string_->determine_type_no_context(); | |
f77aa642 | 11219 | |
11220 | Type_context index_context(Type::lookup_integer_type("int"), false); | |
11221 | if (this->start_->is_constant()) | |
11222 | this->start_->determine_type(&index_context); | |
11223 | else | |
11224 | this->start_->determine_type_no_context(); | |
e440a328 | 11225 | if (this->end_ != NULL) |
f77aa642 | 11226 | { |
11227 | if (this->end_->is_constant()) | |
11228 | this->end_->determine_type(&index_context); | |
11229 | else | |
11230 | this->end_->determine_type_no_context(); | |
11231 | } | |
e440a328 | 11232 | } |
11233 | ||
11234 | // Check types of a string index. | |
11235 | ||
11236 | void | |
11237 | String_index_expression::do_check_types(Gogo*) | |
11238 | { | |
acdc230d | 11239 | Numeric_constant nc; |
11240 | unsigned long v; | |
11241 | if (this->start_->type()->integer_type() == NULL | |
11242 | && !this->start_->type()->is_error() | |
11243 | && (!this->start_->numeric_constant_value(&nc) | |
11244 | || nc.to_unsigned_long(&v) == Numeric_constant::NC_UL_NOTINT)) | |
e440a328 | 11245 | this->report_error(_("index must be integer")); |
11246 | if (this->end_ != NULL | |
11247 | && this->end_->type()->integer_type() == NULL | |
acdc230d | 11248 | && !this->end_->type()->is_error() |
11249 | && !this->end_->is_nil_expression() | |
11250 | && !this->end_->is_error_expression() | |
11251 | && (!this->end_->numeric_constant_value(&nc) | |
11252 | || nc.to_unsigned_long(&v) == Numeric_constant::NC_UL_NOTINT)) | |
e440a328 | 11253 | this->report_error(_("slice end must be integer")); |
11254 | ||
11255 | std::string sval; | |
11256 | bool sval_valid = this->string_->string_constant_value(&sval); | |
11257 | ||
0c77715b | 11258 | Numeric_constant inc; |
e440a328 | 11259 | mpz_t ival; |
0bd5d859 | 11260 | bool ival_valid = false; |
0c77715b | 11261 | if (this->start_->numeric_constant_value(&inc) && inc.to_int(&ival)) |
e440a328 | 11262 | { |
0bd5d859 | 11263 | ival_valid = true; |
e440a328 | 11264 | if (mpz_sgn(ival) < 0 |
b10f32fb | 11265 | || (sval_valid |
11266 | && (this->end_ == NULL | |
11267 | ? mpz_cmp_ui(ival, sval.length()) >= 0 | |
11268 | : mpz_cmp_ui(ival, sval.length()) > 0))) | |
e440a328 | 11269 | { |
631d5788 | 11270 | go_error_at(this->start_->location(), "string index out of bounds"); |
e440a328 | 11271 | this->set_is_error(); |
11272 | } | |
11273 | } | |
11274 | if (this->end_ != NULL && !this->end_->is_nil_expression()) | |
11275 | { | |
0c77715b | 11276 | Numeric_constant enc; |
11277 | mpz_t eval; | |
11278 | if (this->end_->numeric_constant_value(&enc) && enc.to_int(&eval)) | |
e440a328 | 11279 | { |
0c77715b | 11280 | if (mpz_sgn(eval) < 0 |
11281 | || (sval_valid && mpz_cmp_ui(eval, sval.length()) > 0)) | |
e440a328 | 11282 | { |
631d5788 | 11283 | go_error_at(this->end_->location(), "string index out of bounds"); |
e440a328 | 11284 | this->set_is_error(); |
11285 | } | |
0bd5d859 | 11286 | else if (ival_valid && mpz_cmp(ival, eval) > 0) |
11287 | this->report_error(_("inverted slice range")); | |
0c77715b | 11288 | mpz_clear(eval); |
e440a328 | 11289 | } |
11290 | } | |
0bd5d859 | 11291 | if (ival_valid) |
11292 | mpz_clear(ival); | |
e440a328 | 11293 | } |
11294 | ||
ea664253 | 11295 | // Get the backend representation for a string index. |
e440a328 | 11296 | |
ea664253 | 11297 | Bexpression* |
11298 | String_index_expression::do_get_backend(Translate_context* context) | |
e440a328 | 11299 | { |
b13c66cd | 11300 | Location loc = this->location(); |
2c809f8f | 11301 | Expression* string_arg = this->string_; |
11302 | if (this->string_->type()->points_to() != NULL) | |
11303 | string_arg = Expression::make_unary(OPERATOR_MULT, this->string_, loc); | |
e440a328 | 11304 | |
2c809f8f | 11305 | Expression* bad_index = Expression::check_bounds(this->start_, loc); |
e440a328 | 11306 | |
2c809f8f | 11307 | int code = (this->end_ == NULL |
11308 | ? RUNTIME_ERROR_STRING_INDEX_OUT_OF_BOUNDS | |
11309 | : RUNTIME_ERROR_STRING_SLICE_OUT_OF_BOUNDS); | |
e440a328 | 11310 | |
2c809f8f | 11311 | Gogo* gogo = context->gogo(); |
ea664253 | 11312 | Bexpression* crash = gogo->runtime_error(code, loc)->get_backend(context); |
1b1f2abf | 11313 | |
11314 | Type* int_type = Type::lookup_integer_type("int"); | |
e440a328 | 11315 | |
2c809f8f | 11316 | // It is possible that an error occurred earlier because the start index |
11317 | // cannot be represented as an integer type. In this case, we shouldn't | |
11318 | // try casting the starting index into an integer since | |
11319 | // Type_conversion_expression will fail to get the backend representation. | |
11320 | // FIXME. | |
11321 | if (this->start_->type()->integer_type() == NULL | |
11322 | && !Type::are_convertible(int_type, this->start_->type(), NULL)) | |
11323 | { | |
11324 | go_assert(saw_errors()); | |
ea664253 | 11325 | return context->backend()->error_expression(); |
2c809f8f | 11326 | } |
e440a328 | 11327 | |
2c809f8f | 11328 | Expression* start = Expression::make_cast(int_type, this->start_, loc); |
93715b75 | 11329 | Bfunction* bfn = context->function()->func_value()->get_decl(); |
e440a328 | 11330 | |
2c809f8f | 11331 | if (this->end_ == NULL) |
11332 | { | |
11333 | Expression* length = | |
11334 | Expression::make_string_info(this->string_, STRING_INFO_LENGTH, loc); | |
e440a328 | 11335 | |
2c809f8f | 11336 | Expression* start_too_large = |
11337 | Expression::make_binary(OPERATOR_GE, start, length, loc); | |
11338 | bad_index = Expression::make_binary(OPERATOR_OROR, start_too_large, | |
11339 | bad_index, loc); | |
11340 | Expression* bytes = | |
11341 | Expression::make_string_info(this->string_, STRING_INFO_DATA, loc); | |
e440a328 | 11342 | |
ea664253 | 11343 | Bexpression* bstart = start->get_backend(context); |
11344 | Bexpression* ptr = bytes->get_backend(context); | |
2c809f8f | 11345 | ptr = gogo->backend()->pointer_offset_expression(ptr, bstart, loc); |
9b27b43c | 11346 | Btype* ubtype = Type::lookup_integer_type("uint8")->get_backend(gogo); |
11347 | Bexpression* index = | |
11348 | gogo->backend()->indirect_expression(ubtype, ptr, true, loc); | |
e440a328 | 11349 | |
2c809f8f | 11350 | Btype* byte_btype = bytes->type()->points_to()->get_backend(gogo); |
ea664253 | 11351 | Bexpression* index_error = bad_index->get_backend(context); |
93715b75 | 11352 | return gogo->backend()->conditional_expression(bfn, byte_btype, |
11353 | index_error, crash, | |
11354 | index, loc); | |
2c809f8f | 11355 | } |
11356 | ||
11357 | Expression* end = NULL; | |
11358 | if (this->end_->is_nil_expression()) | |
e67508fa | 11359 | end = Expression::make_integer_sl(-1, int_type, loc); |
e440a328 | 11360 | else |
11361 | { | |
2c809f8f | 11362 | Expression* bounds_check = Expression::check_bounds(this->end_, loc); |
11363 | bad_index = | |
11364 | Expression::make_binary(OPERATOR_OROR, bounds_check, bad_index, loc); | |
11365 | end = Expression::make_cast(int_type, this->end_, loc); | |
e440a328 | 11366 | } |
2c809f8f | 11367 | |
11368 | Expression* strslice = Runtime::make_call(Runtime::STRING_SLICE, loc, 3, | |
11369 | string_arg, start, end); | |
ea664253 | 11370 | Bexpression* bstrslice = strslice->get_backend(context); |
2c809f8f | 11371 | |
11372 | Btype* str_btype = strslice->type()->get_backend(gogo); | |
ea664253 | 11373 | Bexpression* index_error = bad_index->get_backend(context); |
93715b75 | 11374 | return gogo->backend()->conditional_expression(bfn, str_btype, index_error, |
ea664253 | 11375 | crash, bstrslice, loc); |
e440a328 | 11376 | } |
11377 | ||
d751bb78 | 11378 | // Dump ast representation for a string index expression. |
11379 | ||
11380 | void | |
11381 | String_index_expression::do_dump_expression(Ast_dump_context* ast_dump_context) | |
11382 | const | |
11383 | { | |
acf2b673 | 11384 | Index_expression::dump_index_expression(ast_dump_context, this->string_, |
11385 | this->start_, this->end_, NULL); | |
d751bb78 | 11386 | } |
11387 | ||
e440a328 | 11388 | // Make a string index expression. END may be NULL. |
11389 | ||
11390 | Expression* | |
11391 | Expression::make_string_index(Expression* string, Expression* start, | |
b13c66cd | 11392 | Expression* end, Location location) |
e440a328 | 11393 | { |
11394 | return new String_index_expression(string, start, end, location); | |
11395 | } | |
11396 | ||
11397 | // Class Map_index. | |
11398 | ||
11399 | // Get the type of the map. | |
11400 | ||
11401 | Map_type* | |
11402 | Map_index_expression::get_map_type() const | |
11403 | { | |
0d5530d9 | 11404 | Map_type* mt = this->map_->type()->map_type(); |
c7524fae | 11405 | if (mt == NULL) |
c484d925 | 11406 | go_assert(saw_errors()); |
e440a328 | 11407 | return mt; |
11408 | } | |
11409 | ||
11410 | // Map index traversal. | |
11411 | ||
11412 | int | |
11413 | Map_index_expression::do_traverse(Traverse* traverse) | |
11414 | { | |
11415 | if (Expression::traverse(&this->map_, traverse) == TRAVERSE_EXIT) | |
11416 | return TRAVERSE_EXIT; | |
11417 | return Expression::traverse(&this->index_, traverse); | |
11418 | } | |
11419 | ||
2c809f8f | 11420 | // We need to pass in a pointer to the key, so flatten the index into a |
11421 | // temporary variable if it isn't already. The value pointer will be | |
11422 | // dereferenced and checked for nil, so flatten into a temporary to avoid | |
11423 | // recomputation. | |
11424 | ||
11425 | Expression* | |
91c0fd76 | 11426 | Map_index_expression::do_flatten(Gogo* gogo, Named_object*, |
2c809f8f | 11427 | Statement_inserter* inserter) |
11428 | { | |
91c0fd76 | 11429 | Location loc = this->location(); |
2c809f8f | 11430 | Map_type* mt = this->get_map_type(); |
5bf8be8b | 11431 | if (this->index()->is_error_expression() |
11432 | || this->index()->type()->is_error_type() | |
11433 | || mt->is_error_type()) | |
11434 | { | |
11435 | go_assert(saw_errors()); | |
11436 | return Expression::make_error(loc); | |
11437 | } | |
11438 | ||
91c0fd76 | 11439 | if (!Type::are_identical(mt->key_type(), this->index_->type(), false, NULL)) |
11440 | { | |
11441 | if (this->index_->type()->interface_type() != NULL | |
11442 | && !this->index_->is_variable()) | |
11443 | { | |
11444 | Temporary_statement* temp = | |
11445 | Statement::make_temporary(NULL, this->index_, loc); | |
11446 | inserter->insert(temp); | |
11447 | this->index_ = Expression::make_temporary_reference(temp, loc); | |
11448 | } | |
11449 | this->index_ = Expression::convert_for_assignment(gogo, mt->key_type(), | |
11450 | this->index_, loc); | |
11451 | } | |
2c809f8f | 11452 | |
11453 | if (!this->index_->is_variable()) | |
11454 | { | |
11455 | Temporary_statement* temp = Statement::make_temporary(NULL, this->index_, | |
91c0fd76 | 11456 | loc); |
2c809f8f | 11457 | inserter->insert(temp); |
91c0fd76 | 11458 | this->index_ = Expression::make_temporary_reference(temp, loc); |
2c809f8f | 11459 | } |
11460 | ||
11461 | if (this->value_pointer_ == NULL) | |
0d5530d9 | 11462 | this->get_value_pointer(gogo); |
5bf8be8b | 11463 | if (this->value_pointer_->is_error_expression() |
11464 | || this->value_pointer_->type()->is_error_type()) | |
11465 | return Expression::make_error(loc); | |
2c809f8f | 11466 | if (!this->value_pointer_->is_variable()) |
11467 | { | |
11468 | Temporary_statement* temp = | |
91c0fd76 | 11469 | Statement::make_temporary(NULL, this->value_pointer_, loc); |
2c809f8f | 11470 | inserter->insert(temp); |
91c0fd76 | 11471 | this->value_pointer_ = Expression::make_temporary_reference(temp, loc); |
2c809f8f | 11472 | } |
11473 | ||
11474 | return this; | |
11475 | } | |
11476 | ||
e440a328 | 11477 | // Return the type of a map index. |
11478 | ||
11479 | Type* | |
11480 | Map_index_expression::do_type() | |
11481 | { | |
c7524fae | 11482 | Map_type* mt = this->get_map_type(); |
11483 | if (mt == NULL) | |
11484 | return Type::make_error_type(); | |
0d5530d9 | 11485 | return mt->val_type(); |
e440a328 | 11486 | } |
11487 | ||
11488 | // Fix the type of a map index. | |
11489 | ||
11490 | void | |
11491 | Map_index_expression::do_determine_type(const Type_context*) | |
11492 | { | |
11493 | this->map_->determine_type_no_context(); | |
c7524fae | 11494 | Map_type* mt = this->get_map_type(); |
11495 | Type* key_type = mt == NULL ? NULL : mt->key_type(); | |
11496 | Type_context subcontext(key_type, false); | |
e440a328 | 11497 | this->index_->determine_type(&subcontext); |
11498 | } | |
11499 | ||
11500 | // Check types of a map index. | |
11501 | ||
11502 | void | |
11503 | Map_index_expression::do_check_types(Gogo*) | |
11504 | { | |
11505 | std::string reason; | |
c7524fae | 11506 | Map_type* mt = this->get_map_type(); |
11507 | if (mt == NULL) | |
11508 | return; | |
11509 | if (!Type::are_assignable(mt->key_type(), this->index_->type(), &reason)) | |
e440a328 | 11510 | { |
11511 | if (reason.empty()) | |
11512 | this->report_error(_("incompatible type for map index")); | |
11513 | else | |
11514 | { | |
631d5788 | 11515 | go_error_at(this->location(), "incompatible type for map index (%s)", |
11516 | reason.c_str()); | |
e440a328 | 11517 | this->set_is_error(); |
11518 | } | |
11519 | } | |
11520 | } | |
11521 | ||
ea664253 | 11522 | // Get the backend representation for a map index. |
e440a328 | 11523 | |
ea664253 | 11524 | Bexpression* |
11525 | Map_index_expression::do_get_backend(Translate_context* context) | |
e440a328 | 11526 | { |
11527 | Map_type* type = this->get_map_type(); | |
c7524fae | 11528 | if (type == NULL) |
2c809f8f | 11529 | { |
11530 | go_assert(saw_errors()); | |
ea664253 | 11531 | return context->backend()->error_expression(); |
2c809f8f | 11532 | } |
e440a328 | 11533 | |
2c809f8f | 11534 | go_assert(this->value_pointer_ != NULL |
11535 | && this->value_pointer_->is_variable()); | |
e440a328 | 11536 | |
0d5530d9 | 11537 | Expression* val = Expression::make_unary(OPERATOR_MULT, this->value_pointer_, |
11538 | this->location()); | |
11539 | return val->get_backend(context); | |
e440a328 | 11540 | } |
11541 | ||
0d5530d9 | 11542 | // Get an expression for the map index. This returns an expression |
11543 | // that evaluates to a pointer to a value. If the key is not in the | |
11544 | // map, the pointer will point to a zero value. | |
e440a328 | 11545 | |
2c809f8f | 11546 | Expression* |
0d5530d9 | 11547 | Map_index_expression::get_value_pointer(Gogo* gogo) |
e440a328 | 11548 | { |
2c809f8f | 11549 | if (this->value_pointer_ == NULL) |
746d2e73 | 11550 | { |
2c809f8f | 11551 | Map_type* type = this->get_map_type(); |
11552 | if (type == NULL) | |
746d2e73 | 11553 | { |
2c809f8f | 11554 | go_assert(saw_errors()); |
11555 | return Expression::make_error(this->location()); | |
746d2e73 | 11556 | } |
e440a328 | 11557 | |
2c809f8f | 11558 | Location loc = this->location(); |
11559 | Expression* map_ref = this->map_; | |
e440a328 | 11560 | |
0d5530d9 | 11561 | Expression* index_ptr = Expression::make_unary(OPERATOR_AND, |
11562 | this->index_, | |
2c809f8f | 11563 | loc); |
0d5530d9 | 11564 | |
11565 | Expression* zero = type->fat_zero_value(gogo); | |
11566 | ||
11567 | Expression* map_index; | |
11568 | ||
11569 | if (zero == NULL) | |
11570 | map_index = | |
11571 | Runtime::make_call(Runtime::MAPACCESS1, loc, 3, | |
11572 | Expression::make_type_descriptor(type, loc), | |
11573 | map_ref, index_ptr); | |
11574 | else | |
11575 | map_index = | |
11576 | Runtime::make_call(Runtime::MAPACCESS1_FAT, loc, 4, | |
11577 | Expression::make_type_descriptor(type, loc), | |
11578 | map_ref, index_ptr, zero); | |
2c809f8f | 11579 | |
11580 | Type* val_type = type->val_type(); | |
11581 | this->value_pointer_ = | |
11582 | Expression::make_unsafe_cast(Type::make_pointer_type(val_type), | |
11583 | map_index, this->location()); | |
11584 | } | |
0d5530d9 | 11585 | |
2c809f8f | 11586 | return this->value_pointer_; |
e440a328 | 11587 | } |
11588 | ||
d751bb78 | 11589 | // Dump ast representation for a map index expression |
11590 | ||
11591 | void | |
11592 | Map_index_expression::do_dump_expression(Ast_dump_context* ast_dump_context) | |
11593 | const | |
11594 | { | |
acf2b673 | 11595 | Index_expression::dump_index_expression(ast_dump_context, this->map_, |
11596 | this->index_, NULL, NULL); | |
d751bb78 | 11597 | } |
11598 | ||
e440a328 | 11599 | // Make a map index expression. |
11600 | ||
11601 | Map_index_expression* | |
11602 | Expression::make_map_index(Expression* map, Expression* index, | |
b13c66cd | 11603 | Location location) |
e440a328 | 11604 | { |
11605 | return new Map_index_expression(map, index, location); | |
11606 | } | |
11607 | ||
11608 | // Class Field_reference_expression. | |
11609 | ||
149eabc5 | 11610 | // Lower a field reference expression. There is nothing to lower, but |
11611 | // this is where we generate the tracking information for fields with | |
11612 | // the magic go:"track" tag. | |
11613 | ||
11614 | Expression* | |
11615 | Field_reference_expression::do_lower(Gogo* gogo, Named_object* function, | |
11616 | Statement_inserter* inserter, int) | |
11617 | { | |
11618 | Struct_type* struct_type = this->expr_->type()->struct_type(); | |
11619 | if (struct_type == NULL) | |
11620 | { | |
11621 | // Error will be reported elsewhere. | |
11622 | return this; | |
11623 | } | |
11624 | const Struct_field* field = struct_type->field(this->field_index_); | |
11625 | if (field == NULL) | |
11626 | return this; | |
11627 | if (!field->has_tag()) | |
11628 | return this; | |
11629 | if (field->tag().find("go:\"track\"") == std::string::npos) | |
11630 | return this; | |
11631 | ||
604e278d | 11632 | // References from functions generated by the compiler don't count. |
c6292d1d | 11633 | if (function != NULL && function->func_value()->is_type_specific_function()) |
604e278d | 11634 | return this; |
11635 | ||
149eabc5 | 11636 | // We have found a reference to a tracked field. Build a call to |
11637 | // the runtime function __go_fieldtrack with a string that describes | |
11638 | // the field. FIXME: We should only call this once per referenced | |
11639 | // field per function, not once for each reference to the field. | |
11640 | ||
11641 | if (this->called_fieldtrack_) | |
11642 | return this; | |
11643 | this->called_fieldtrack_ = true; | |
11644 | ||
11645 | Location loc = this->location(); | |
11646 | ||
11647 | std::string s = "fieldtrack \""; | |
11648 | Named_type* nt = this->expr_->type()->named_type(); | |
11649 | if (nt == NULL || nt->named_object()->package() == NULL) | |
11650 | s.append(gogo->pkgpath()); | |
11651 | else | |
11652 | s.append(nt->named_object()->package()->pkgpath()); | |
11653 | s.push_back('.'); | |
11654 | if (nt != NULL) | |
5c29ad36 | 11655 | s.append(Gogo::unpack_hidden_name(nt->name())); |
149eabc5 | 11656 | s.push_back('.'); |
11657 | s.append(field->field_name()); | |
11658 | s.push_back('"'); | |
11659 | ||
11660 | // We can't use a string here, because internally a string holds a | |
11661 | // pointer to the actual bytes; when the linker garbage collects the | |
11662 | // string, it won't garbage collect the bytes. So we use a | |
11663 | // [...]byte. | |
11664 | ||
e67508fa | 11665 | Expression* length_expr = Expression::make_integer_ul(s.length(), NULL, loc); |
149eabc5 | 11666 | |
11667 | Type* byte_type = gogo->lookup_global("byte")->type_value(); | |
6bf4793c | 11668 | Array_type* array_type = Type::make_array_type(byte_type, length_expr); |
11669 | array_type->set_is_array_incomparable(); | |
149eabc5 | 11670 | |
11671 | Expression_list* bytes = new Expression_list(); | |
11672 | for (std::string::const_iterator p = s.begin(); p != s.end(); p++) | |
11673 | { | |
e67508fa | 11674 | unsigned char c = static_cast<unsigned char>(*p); |
11675 | bytes->push_back(Expression::make_integer_ul(c, NULL, loc)); | |
149eabc5 | 11676 | } |
11677 | ||
11678 | Expression* e = Expression::make_composite_literal(array_type, 0, false, | |
62750cd5 | 11679 | bytes, false, loc); |
149eabc5 | 11680 | |
11681 | Variable* var = new Variable(array_type, e, true, false, false, loc); | |
11682 | ||
11683 | static int count; | |
11684 | char buf[50]; | |
11685 | snprintf(buf, sizeof buf, "fieldtrack.%d", count); | |
11686 | ++count; | |
11687 | ||
11688 | Named_object* no = gogo->add_variable(buf, var); | |
11689 | e = Expression::make_var_reference(no, loc); | |
11690 | e = Expression::make_unary(OPERATOR_AND, e, loc); | |
11691 | ||
11692 | Expression* call = Runtime::make_call(Runtime::FIELDTRACK, loc, 1, e); | |
604e278d | 11693 | gogo->lower_expression(function, inserter, &call); |
149eabc5 | 11694 | inserter->insert(Statement::make_statement(call, false)); |
11695 | ||
11696 | // Put this function, and the global variable we just created, into | |
11697 | // unique sections. This will permit the linker to garbage collect | |
11698 | // them if they are not referenced. The effect is that the only | |
11699 | // strings, indicating field references, that will wind up in the | |
11700 | // executable will be those for functions that are actually needed. | |
66a6be58 | 11701 | if (function != NULL) |
11702 | function->func_value()->set_in_unique_section(); | |
149eabc5 | 11703 | var->set_in_unique_section(); |
11704 | ||
11705 | return this; | |
11706 | } | |
11707 | ||
e440a328 | 11708 | // Return the type of a field reference. |
11709 | ||
11710 | Type* | |
11711 | Field_reference_expression::do_type() | |
11712 | { | |
b0e628fb | 11713 | Type* type = this->expr_->type(); |
5c13bd80 | 11714 | if (type->is_error()) |
b0e628fb | 11715 | return type; |
11716 | Struct_type* struct_type = type->struct_type(); | |
c484d925 | 11717 | go_assert(struct_type != NULL); |
e440a328 | 11718 | return struct_type->field(this->field_index_)->type(); |
11719 | } | |
11720 | ||
11721 | // Check the types for a field reference. | |
11722 | ||
11723 | void | |
11724 | Field_reference_expression::do_check_types(Gogo*) | |
11725 | { | |
b0e628fb | 11726 | Type* type = this->expr_->type(); |
5c13bd80 | 11727 | if (type->is_error()) |
b0e628fb | 11728 | return; |
11729 | Struct_type* struct_type = type->struct_type(); | |
c484d925 | 11730 | go_assert(struct_type != NULL); |
11731 | go_assert(struct_type->field(this->field_index_) != NULL); | |
e440a328 | 11732 | } |
11733 | ||
ea664253 | 11734 | // Get the backend representation for a field reference. |
e440a328 | 11735 | |
ea664253 | 11736 | Bexpression* |
11737 | Field_reference_expression::do_get_backend(Translate_context* context) | |
e440a328 | 11738 | { |
ea664253 | 11739 | Bexpression* bstruct = this->expr_->get_backend(context); |
11740 | return context->gogo()->backend()->struct_field_expression(bstruct, | |
11741 | this->field_index_, | |
11742 | this->location()); | |
e440a328 | 11743 | } |
11744 | ||
d751bb78 | 11745 | // Dump ast representation for a field reference expression. |
11746 | ||
11747 | void | |
11748 | Field_reference_expression::do_dump_expression( | |
11749 | Ast_dump_context* ast_dump_context) const | |
11750 | { | |
11751 | this->expr_->dump_expression(ast_dump_context); | |
11752 | ast_dump_context->ostream() << "." << this->field_index_; | |
11753 | } | |
11754 | ||
e440a328 | 11755 | // Make a reference to a qualified identifier in an expression. |
11756 | ||
11757 | Field_reference_expression* | |
11758 | Expression::make_field_reference(Expression* expr, unsigned int field_index, | |
b13c66cd | 11759 | Location location) |
e440a328 | 11760 | { |
11761 | return new Field_reference_expression(expr, field_index, location); | |
11762 | } | |
11763 | ||
11764 | // Class Interface_field_reference_expression. | |
11765 | ||
2387f644 | 11766 | // Return an expression for the pointer to the function to call. |
e440a328 | 11767 | |
2387f644 | 11768 | Expression* |
11769 | Interface_field_reference_expression::get_function() | |
e440a328 | 11770 | { |
2387f644 | 11771 | Expression* ref = this->expr_; |
11772 | Location loc = this->location(); | |
11773 | if (ref->type()->points_to() != NULL) | |
11774 | ref = Expression::make_unary(OPERATOR_MULT, ref, loc); | |
e440a328 | 11775 | |
2387f644 | 11776 | Expression* mtable = |
11777 | Expression::make_interface_info(ref, INTERFACE_INFO_METHODS, loc); | |
11778 | Struct_type* mtable_type = mtable->type()->points_to()->struct_type(); | |
e440a328 | 11779 | |
11780 | std::string name = Gogo::unpack_hidden_name(this->name_); | |
2387f644 | 11781 | unsigned int index; |
11782 | const Struct_field* field = mtable_type->find_local_field(name, &index); | |
11783 | go_assert(field != NULL); | |
11784 | mtable = Expression::make_unary(OPERATOR_MULT, mtable, loc); | |
11785 | return Expression::make_field_reference(mtable, index, loc); | |
e440a328 | 11786 | } |
11787 | ||
2387f644 | 11788 | // Return an expression for the first argument to pass to the interface |
e440a328 | 11789 | // function. |
11790 | ||
2387f644 | 11791 | Expression* |
11792 | Interface_field_reference_expression::get_underlying_object() | |
e440a328 | 11793 | { |
2387f644 | 11794 | Expression* expr = this->expr_; |
11795 | if (expr->type()->points_to() != NULL) | |
11796 | expr = Expression::make_unary(OPERATOR_MULT, expr, this->location()); | |
11797 | return Expression::make_interface_info(expr, INTERFACE_INFO_OBJECT, | |
11798 | this->location()); | |
e440a328 | 11799 | } |
11800 | ||
11801 | // Traversal. | |
11802 | ||
11803 | int | |
11804 | Interface_field_reference_expression::do_traverse(Traverse* traverse) | |
11805 | { | |
11806 | return Expression::traverse(&this->expr_, traverse); | |
11807 | } | |
11808 | ||
0afbb937 | 11809 | // Lower the expression. If this expression is not called, we need to |
11810 | // evaluate the expression twice when converting to the backend | |
11811 | // interface. So introduce a temporary variable if necessary. | |
11812 | ||
11813 | Expression* | |
9782d556 | 11814 | Interface_field_reference_expression::do_flatten(Gogo*, Named_object*, |
11815 | Statement_inserter* inserter) | |
0afbb937 | 11816 | { |
5bf8be8b | 11817 | if (this->expr_->is_error_expression() |
11818 | || this->expr_->type()->is_error_type()) | |
11819 | { | |
11820 | go_assert(saw_errors()); | |
11821 | return Expression::make_error(this->location()); | |
11822 | } | |
11823 | ||
2387f644 | 11824 | if (!this->expr_->is_variable()) |
0afbb937 | 11825 | { |
11826 | Temporary_statement* temp = | |
11827 | Statement::make_temporary(this->expr_->type(), NULL, this->location()); | |
11828 | inserter->insert(temp); | |
11829 | this->expr_ = Expression::make_set_and_use_temporary(temp, this->expr_, | |
11830 | this->location()); | |
11831 | } | |
11832 | return this; | |
11833 | } | |
11834 | ||
e440a328 | 11835 | // Return the type of an interface field reference. |
11836 | ||
11837 | Type* | |
11838 | Interface_field_reference_expression::do_type() | |
11839 | { | |
11840 | Type* expr_type = this->expr_->type(); | |
11841 | ||
11842 | Type* points_to = expr_type->points_to(); | |
11843 | if (points_to != NULL) | |
11844 | expr_type = points_to; | |
11845 | ||
11846 | Interface_type* interface_type = expr_type->interface_type(); | |
11847 | if (interface_type == NULL) | |
11848 | return Type::make_error_type(); | |
11849 | ||
11850 | const Typed_identifier* method = interface_type->find_method(this->name_); | |
11851 | if (method == NULL) | |
11852 | return Type::make_error_type(); | |
11853 | ||
11854 | return method->type(); | |
11855 | } | |
11856 | ||
11857 | // Determine types. | |
11858 | ||
11859 | void | |
11860 | Interface_field_reference_expression::do_determine_type(const Type_context*) | |
11861 | { | |
11862 | this->expr_->determine_type_no_context(); | |
11863 | } | |
11864 | ||
11865 | // Check the types for an interface field reference. | |
11866 | ||
11867 | void | |
11868 | Interface_field_reference_expression::do_check_types(Gogo*) | |
11869 | { | |
11870 | Type* type = this->expr_->type(); | |
11871 | ||
11872 | Type* points_to = type->points_to(); | |
11873 | if (points_to != NULL) | |
11874 | type = points_to; | |
11875 | ||
11876 | Interface_type* interface_type = type->interface_type(); | |
11877 | if (interface_type == NULL) | |
5c491127 | 11878 | { |
11879 | if (!type->is_error_type()) | |
11880 | this->report_error(_("expected interface or pointer to interface")); | |
11881 | } | |
e440a328 | 11882 | else |
11883 | { | |
11884 | const Typed_identifier* method = | |
11885 | interface_type->find_method(this->name_); | |
11886 | if (method == NULL) | |
11887 | { | |
631d5788 | 11888 | go_error_at(this->location(), "method %qs not in interface", |
11889 | Gogo::message_name(this->name_).c_str()); | |
e440a328 | 11890 | this->set_is_error(); |
11891 | } | |
11892 | } | |
11893 | } | |
11894 | ||
0afbb937 | 11895 | // If an interface field reference is not simply called, then it is |
11896 | // represented as a closure. The closure will hold a single variable, | |
11897 | // the value of the interface on which the method should be called. | |
11898 | // The function will be a simple thunk that pulls the value from the | |
11899 | // closure and calls the method with the remaining arguments. | |
11900 | ||
11901 | // Because method values are not common, we don't build all thunks for | |
11902 | // all possible interface methods, but instead only build them as we | |
11903 | // need them. In particular, we even build them on demand for | |
11904 | // interface methods defined in other packages. | |
11905 | ||
11906 | Interface_field_reference_expression::Interface_method_thunks | |
11907 | Interface_field_reference_expression::interface_method_thunks; | |
11908 | ||
11909 | // Find or create the thunk to call method NAME on TYPE. | |
11910 | ||
11911 | Named_object* | |
11912 | Interface_field_reference_expression::create_thunk(Gogo* gogo, | |
11913 | Interface_type* type, | |
11914 | const std::string& name) | |
11915 | { | |
11916 | std::pair<Interface_type*, Method_thunks*> val(type, NULL); | |
11917 | std::pair<Interface_method_thunks::iterator, bool> ins = | |
11918 | Interface_field_reference_expression::interface_method_thunks.insert(val); | |
11919 | if (ins.second) | |
11920 | { | |
11921 | // This is the first time we have seen this interface. | |
11922 | ins.first->second = new Method_thunks(); | |
11923 | } | |
11924 | ||
11925 | for (Method_thunks::const_iterator p = ins.first->second->begin(); | |
11926 | p != ins.first->second->end(); | |
11927 | p++) | |
11928 | if (p->first == name) | |
11929 | return p->second; | |
11930 | ||
11931 | Location loc = type->location(); | |
11932 | ||
11933 | const Typed_identifier* method_id = type->find_method(name); | |
11934 | if (method_id == NULL) | |
11935 | return Named_object::make_erroneous_name(Gogo::thunk_name()); | |
11936 | ||
11937 | Function_type* orig_fntype = method_id->type()->function_type(); | |
11938 | if (orig_fntype == NULL) | |
11939 | return Named_object::make_erroneous_name(Gogo::thunk_name()); | |
11940 | ||
11941 | Struct_field_list* sfl = new Struct_field_list(); | |
f8bdf81a | 11942 | // The type here is wrong--it should be the C function type. But it |
11943 | // doesn't really matter. | |
0afbb937 | 11944 | Type* vt = Type::make_pointer_type(Type::make_void_type()); |
11945 | sfl->push_back(Struct_field(Typed_identifier("fn.0", vt, loc))); | |
11946 | sfl->push_back(Struct_field(Typed_identifier("val.1", type, loc))); | |
6bf4793c | 11947 | Struct_type* st = Type::make_struct_type(sfl, loc); |
11948 | st->set_is_struct_incomparable(); | |
11949 | Type* closure_type = Type::make_pointer_type(st); | |
0afbb937 | 11950 | |
f8bdf81a | 11951 | Function_type* new_fntype = orig_fntype->copy_with_names(); |
0afbb937 | 11952 | |
da244e59 | 11953 | std::string thunk_name = Gogo::thunk_name(); |
11954 | Named_object* new_no = gogo->start_function(thunk_name, new_fntype, | |
0afbb937 | 11955 | false, loc); |
11956 | ||
f8bdf81a | 11957 | Variable* cvar = new Variable(closure_type, NULL, false, false, false, loc); |
11958 | cvar->set_is_used(); | |
1ecc6157 | 11959 | cvar->set_is_closure(); |
da244e59 | 11960 | Named_object* cp = Named_object::make_variable("$closure" + thunk_name, |
11961 | NULL, cvar); | |
f8bdf81a | 11962 | new_no->func_value()->set_closure_var(cp); |
0afbb937 | 11963 | |
f8bdf81a | 11964 | gogo->start_block(loc); |
0afbb937 | 11965 | |
11966 | // Field 0 of the closure is the function code pointer, field 1 is | |
11967 | // the value on which to invoke the method. | |
11968 | Expression* arg = Expression::make_var_reference(cp, loc); | |
11969 | arg = Expression::make_unary(OPERATOR_MULT, arg, loc); | |
11970 | arg = Expression::make_field_reference(arg, 1, loc); | |
11971 | ||
11972 | Expression *ifre = Expression::make_interface_field_reference(arg, name, | |
11973 | loc); | |
11974 | ||
11975 | const Typed_identifier_list* orig_params = orig_fntype->parameters(); | |
11976 | Expression_list* args; | |
11977 | if (orig_params == NULL || orig_params->empty()) | |
11978 | args = NULL; | |
11979 | else | |
11980 | { | |
11981 | const Typed_identifier_list* new_params = new_fntype->parameters(); | |
11982 | args = new Expression_list(); | |
11983 | for (Typed_identifier_list::const_iterator p = new_params->begin(); | |
f8bdf81a | 11984 | p != new_params->end(); |
0afbb937 | 11985 | ++p) |
11986 | { | |
11987 | Named_object* p_no = gogo->lookup(p->name(), NULL); | |
11988 | go_assert(p_no != NULL | |
11989 | && p_no->is_variable() | |
11990 | && p_no->var_value()->is_parameter()); | |
11991 | args->push_back(Expression::make_var_reference(p_no, loc)); | |
11992 | } | |
11993 | } | |
11994 | ||
11995 | Call_expression* call = Expression::make_call(ifre, args, | |
11996 | orig_fntype->is_varargs(), | |
11997 | loc); | |
11998 | call->set_varargs_are_lowered(); | |
11999 | ||
12000 | Statement* s = Statement::make_return_from_call(call, loc); | |
12001 | gogo->add_statement(s); | |
12002 | Block* b = gogo->finish_block(loc); | |
12003 | gogo->add_block(b, loc); | |
12004 | gogo->lower_block(new_no, b); | |
a32698ee | 12005 | gogo->flatten_block(new_no, b); |
0afbb937 | 12006 | gogo->finish_function(loc); |
12007 | ||
12008 | ins.first->second->push_back(std::make_pair(name, new_no)); | |
12009 | return new_no; | |
12010 | } | |
12011 | ||
ea664253 | 12012 | // Get the backend representation for a method value. |
e440a328 | 12013 | |
ea664253 | 12014 | Bexpression* |
12015 | Interface_field_reference_expression::do_get_backend(Translate_context* context) | |
e440a328 | 12016 | { |
0afbb937 | 12017 | Interface_type* type = this->expr_->type()->interface_type(); |
12018 | if (type == NULL) | |
12019 | { | |
12020 | go_assert(saw_errors()); | |
ea664253 | 12021 | return context->backend()->error_expression(); |
0afbb937 | 12022 | } |
12023 | ||
12024 | Named_object* thunk = | |
12025 | Interface_field_reference_expression::create_thunk(context->gogo(), | |
12026 | type, this->name_); | |
12027 | if (thunk->is_erroneous()) | |
12028 | { | |
12029 | go_assert(saw_errors()); | |
ea664253 | 12030 | return context->backend()->error_expression(); |
0afbb937 | 12031 | } |
12032 | ||
12033 | // FIXME: We should lower this earlier, but we can't it lower it in | |
12034 | // the lowering pass because at that point we don't know whether we | |
12035 | // need to create the thunk or not. If the expression is called, we | |
12036 | // don't need the thunk. | |
12037 | ||
12038 | Location loc = this->location(); | |
12039 | ||
12040 | Struct_field_list* fields = new Struct_field_list(); | |
12041 | fields->push_back(Struct_field(Typed_identifier("fn.0", | |
12042 | thunk->func_value()->type(), | |
12043 | loc))); | |
12044 | fields->push_back(Struct_field(Typed_identifier("val.1", | |
12045 | this->expr_->type(), | |
12046 | loc))); | |
12047 | Struct_type* st = Type::make_struct_type(fields, loc); | |
6bf4793c | 12048 | st->set_is_struct_incomparable(); |
0afbb937 | 12049 | |
12050 | Expression_list* vals = new Expression_list(); | |
12051 | vals->push_back(Expression::make_func_code_reference(thunk, loc)); | |
12052 | vals->push_back(this->expr_); | |
12053 | ||
12054 | Expression* expr = Expression::make_struct_composite_literal(st, vals, loc); | |
ea664253 | 12055 | Bexpression* bclosure = |
12056 | Expression::make_heap_expression(expr, loc)->get_backend(context); | |
0afbb937 | 12057 | |
4df0c2d4 | 12058 | Gogo* gogo = context->gogo(); |
12059 | Btype* btype = this->type()->get_backend(gogo); | |
12060 | bclosure = gogo->backend()->convert_expression(btype, bclosure, loc); | |
12061 | ||
2387f644 | 12062 | Expression* nil_check = |
12063 | Expression::make_binary(OPERATOR_EQEQ, this->expr_, | |
12064 | Expression::make_nil(loc), loc); | |
ea664253 | 12065 | Bexpression* bnil_check = nil_check->get_backend(context); |
0afbb937 | 12066 | |
ea664253 | 12067 | Bexpression* bcrash = gogo->runtime_error(RUNTIME_ERROR_NIL_DEREFERENCE, |
12068 | loc)->get_backend(context); | |
2387f644 | 12069 | |
93715b75 | 12070 | Bfunction* bfn = context->function()->func_value()->get_decl(); |
2387f644 | 12071 | Bexpression* bcond = |
93715b75 | 12072 | gogo->backend()->conditional_expression(bfn, NULL, |
12073 | bnil_check, bcrash, NULL, loc); | |
0ab48656 | 12074 | Bfunction* bfunction = context->function()->func_value()->get_decl(); |
12075 | Bstatement* cond_statement = | |
12076 | gogo->backend()->expression_statement(bfunction, bcond); | |
ea664253 | 12077 | return gogo->backend()->compound_expression(cond_statement, bclosure, loc); |
e440a328 | 12078 | } |
12079 | ||
d751bb78 | 12080 | // Dump ast representation for an interface field reference. |
12081 | ||
12082 | void | |
12083 | Interface_field_reference_expression::do_dump_expression( | |
12084 | Ast_dump_context* ast_dump_context) const | |
12085 | { | |
12086 | this->expr_->dump_expression(ast_dump_context); | |
12087 | ast_dump_context->ostream() << "." << this->name_; | |
12088 | } | |
12089 | ||
e440a328 | 12090 | // Make a reference to a field in an interface. |
12091 | ||
12092 | Expression* | |
12093 | Expression::make_interface_field_reference(Expression* expr, | |
12094 | const std::string& field, | |
b13c66cd | 12095 | Location location) |
e440a328 | 12096 | { |
12097 | return new Interface_field_reference_expression(expr, field, location); | |
12098 | } | |
12099 | ||
12100 | // A general selector. This is a Parser_expression for LEFT.NAME. It | |
12101 | // is lowered after we know the type of the left hand side. | |
12102 | ||
12103 | class Selector_expression : public Parser_expression | |
12104 | { | |
12105 | public: | |
12106 | Selector_expression(Expression* left, const std::string& name, | |
b13c66cd | 12107 | Location location) |
e440a328 | 12108 | : Parser_expression(EXPRESSION_SELECTOR, location), |
12109 | left_(left), name_(name) | |
12110 | { } | |
12111 | ||
12112 | protected: | |
12113 | int | |
12114 | do_traverse(Traverse* traverse) | |
12115 | { return Expression::traverse(&this->left_, traverse); } | |
12116 | ||
12117 | Expression* | |
ceeb4318 | 12118 | do_lower(Gogo*, Named_object*, Statement_inserter*, int); |
e440a328 | 12119 | |
12120 | Expression* | |
12121 | do_copy() | |
12122 | { | |
12123 | return new Selector_expression(this->left_->copy(), this->name_, | |
12124 | this->location()); | |
12125 | } | |
12126 | ||
d751bb78 | 12127 | void |
12128 | do_dump_expression(Ast_dump_context* ast_dump_context) const; | |
12129 | ||
e440a328 | 12130 | private: |
12131 | Expression* | |
12132 | lower_method_expression(Gogo*); | |
12133 | ||
12134 | // The expression on the left hand side. | |
12135 | Expression* left_; | |
12136 | // The name on the right hand side. | |
12137 | std::string name_; | |
12138 | }; | |
12139 | ||
12140 | // Lower a selector expression once we know the real type of the left | |
12141 | // hand side. | |
12142 | ||
12143 | Expression* | |
ceeb4318 | 12144 | Selector_expression::do_lower(Gogo* gogo, Named_object*, Statement_inserter*, |
12145 | int) | |
e440a328 | 12146 | { |
12147 | Expression* left = this->left_; | |
12148 | if (left->is_type_expression()) | |
12149 | return this->lower_method_expression(gogo); | |
12150 | return Type::bind_field_or_method(gogo, left->type(), left, this->name_, | |
12151 | this->location()); | |
12152 | } | |
12153 | ||
12154 | // Lower a method expression T.M or (*T).M. We turn this into a | |
12155 | // function literal. | |
12156 | ||
12157 | Expression* | |
12158 | Selector_expression::lower_method_expression(Gogo* gogo) | |
12159 | { | |
b13c66cd | 12160 | Location location = this->location(); |
868b439e | 12161 | Type* left_type = this->left_->type(); |
12162 | Type* type = left_type; | |
e440a328 | 12163 | const std::string& name(this->name_); |
12164 | ||
12165 | bool is_pointer; | |
12166 | if (type->points_to() == NULL) | |
12167 | is_pointer = false; | |
12168 | else | |
12169 | { | |
12170 | is_pointer = true; | |
12171 | type = type->points_to(); | |
12172 | } | |
12173 | Named_type* nt = type->named_type(); | |
12174 | if (nt == NULL) | |
12175 | { | |
631d5788 | 12176 | go_error_at(location, |
12177 | ("method expression requires named type or " | |
12178 | "pointer to named type")); | |
e440a328 | 12179 | return Expression::make_error(location); |
12180 | } | |
12181 | ||
12182 | bool is_ambiguous; | |
12183 | Method* method = nt->method_function(name, &is_ambiguous); | |
ab1468c3 | 12184 | const Typed_identifier* imethod = NULL; |
dcc8506b | 12185 | if (method == NULL && !is_pointer) |
ab1468c3 | 12186 | { |
12187 | Interface_type* it = nt->interface_type(); | |
12188 | if (it != NULL) | |
12189 | imethod = it->find_method(name); | |
12190 | } | |
12191 | ||
868b439e | 12192 | if ((method == NULL && imethod == NULL) |
12193 | || (left_type->named_type() != NULL && left_type->points_to() != NULL)) | |
e440a328 | 12194 | { |
12195 | if (!is_ambiguous) | |
631d5788 | 12196 | go_error_at(location, "type %<%s%s%> has no method %<%s%>", |
12197 | is_pointer ? "*" : "", | |
12198 | nt->message_name().c_str(), | |
12199 | Gogo::message_name(name).c_str()); | |
e440a328 | 12200 | else |
631d5788 | 12201 | go_error_at(location, "method %<%s%s%> is ambiguous in type %<%s%>", |
12202 | Gogo::message_name(name).c_str(), | |
12203 | is_pointer ? "*" : "", | |
12204 | nt->message_name().c_str()); | |
e440a328 | 12205 | return Expression::make_error(location); |
12206 | } | |
12207 | ||
ab1468c3 | 12208 | if (method != NULL && !is_pointer && !method->is_value_method()) |
e440a328 | 12209 | { |
631d5788 | 12210 | go_error_at(location, "method requires pointer (use %<(*%s).%s%>)", |
12211 | nt->message_name().c_str(), | |
12212 | Gogo::message_name(name).c_str()); | |
e440a328 | 12213 | return Expression::make_error(location); |
12214 | } | |
12215 | ||
12216 | // Build a new function type in which the receiver becomes the first | |
12217 | // argument. | |
ab1468c3 | 12218 | Function_type* method_type; |
12219 | if (method != NULL) | |
12220 | { | |
12221 | method_type = method->type(); | |
c484d925 | 12222 | go_assert(method_type->is_method()); |
ab1468c3 | 12223 | } |
12224 | else | |
12225 | { | |
12226 | method_type = imethod->type()->function_type(); | |
c484d925 | 12227 | go_assert(method_type != NULL && !method_type->is_method()); |
ab1468c3 | 12228 | } |
e440a328 | 12229 | |
12230 | const char* const receiver_name = "$this"; | |
12231 | Typed_identifier_list* parameters = new Typed_identifier_list(); | |
12232 | parameters->push_back(Typed_identifier(receiver_name, this->left_->type(), | |
12233 | location)); | |
12234 | ||
12235 | const Typed_identifier_list* method_parameters = method_type->parameters(); | |
12236 | if (method_parameters != NULL) | |
12237 | { | |
f470da59 | 12238 | int i = 0; |
e440a328 | 12239 | for (Typed_identifier_list::const_iterator p = method_parameters->begin(); |
12240 | p != method_parameters->end(); | |
f470da59 | 12241 | ++p, ++i) |
12242 | { | |
68883531 | 12243 | if (!p->name().empty()) |
f470da59 | 12244 | parameters->push_back(*p); |
12245 | else | |
12246 | { | |
12247 | char buf[20]; | |
12248 | snprintf(buf, sizeof buf, "$param%d", i); | |
12249 | parameters->push_back(Typed_identifier(buf, p->type(), | |
12250 | p->location())); | |
12251 | } | |
12252 | } | |
e440a328 | 12253 | } |
12254 | ||
12255 | const Typed_identifier_list* method_results = method_type->results(); | |
12256 | Typed_identifier_list* results; | |
12257 | if (method_results == NULL) | |
12258 | results = NULL; | |
12259 | else | |
12260 | { | |
12261 | results = new Typed_identifier_list(); | |
12262 | for (Typed_identifier_list::const_iterator p = method_results->begin(); | |
12263 | p != method_results->end(); | |
12264 | ++p) | |
12265 | results->push_back(*p); | |
12266 | } | |
12267 | ||
12268 | Function_type* fntype = Type::make_function_type(NULL, parameters, results, | |
12269 | location); | |
12270 | if (method_type->is_varargs()) | |
12271 | fntype->set_is_varargs(); | |
12272 | ||
12273 | // We generate methods which always takes a pointer to the receiver | |
12274 | // as their first argument. If this is for a pointer type, we can | |
12275 | // simply reuse the existing function. We use an internal hack to | |
12276 | // get the right type. | |
8381eda7 | 12277 | // FIXME: This optimization is disabled because it doesn't yet work |
12278 | // with function descriptors when the method expression is not | |
12279 | // directly called. | |
12280 | if (method != NULL && is_pointer && false) | |
e440a328 | 12281 | { |
12282 | Named_object* mno = (method->needs_stub_method() | |
12283 | ? method->stub_object() | |
12284 | : method->named_object()); | |
12285 | Expression* f = Expression::make_func_reference(mno, NULL, location); | |
12286 | f = Expression::make_cast(fntype, f, location); | |
12287 | Type_conversion_expression* tce = | |
12288 | static_cast<Type_conversion_expression*>(f); | |
12289 | tce->set_may_convert_function_types(); | |
12290 | return f; | |
12291 | } | |
12292 | ||
12293 | Named_object* no = gogo->start_function(Gogo::thunk_name(), fntype, false, | |
12294 | location); | |
12295 | ||
12296 | Named_object* vno = gogo->lookup(receiver_name, NULL); | |
c484d925 | 12297 | go_assert(vno != NULL); |
e440a328 | 12298 | Expression* ve = Expression::make_var_reference(vno, location); |
ab1468c3 | 12299 | Expression* bm; |
12300 | if (method != NULL) | |
12301 | bm = Type::bind_field_or_method(gogo, nt, ve, name, location); | |
12302 | else | |
12303 | bm = Expression::make_interface_field_reference(ve, name, location); | |
f690b0bb | 12304 | |
12305 | // Even though we found the method above, if it has an error type we | |
12306 | // may see an error here. | |
12307 | if (bm->is_error_expression()) | |
463fe805 | 12308 | { |
12309 | gogo->finish_function(location); | |
12310 | return bm; | |
12311 | } | |
e440a328 | 12312 | |
12313 | Expression_list* args; | |
f470da59 | 12314 | if (parameters->size() <= 1) |
e440a328 | 12315 | args = NULL; |
12316 | else | |
12317 | { | |
12318 | args = new Expression_list(); | |
f470da59 | 12319 | Typed_identifier_list::const_iterator p = parameters->begin(); |
12320 | ++p; | |
12321 | for (; p != parameters->end(); ++p) | |
e440a328 | 12322 | { |
12323 | vno = gogo->lookup(p->name(), NULL); | |
c484d925 | 12324 | go_assert(vno != NULL); |
e440a328 | 12325 | args->push_back(Expression::make_var_reference(vno, location)); |
12326 | } | |
12327 | } | |
12328 | ||
ceeb4318 | 12329 | gogo->start_block(location); |
12330 | ||
e440a328 | 12331 | Call_expression* call = Expression::make_call(bm, args, |
12332 | method_type->is_varargs(), | |
12333 | location); | |
12334 | ||
0afbb937 | 12335 | Statement* s = Statement::make_return_from_call(call, location); |
e440a328 | 12336 | gogo->add_statement(s); |
12337 | ||
ceeb4318 | 12338 | Block* b = gogo->finish_block(location); |
12339 | ||
12340 | gogo->add_block(b, location); | |
12341 | ||
12342 | // Lower the call in case there are multiple results. | |
12343 | gogo->lower_block(no, b); | |
a32698ee | 12344 | gogo->flatten_block(no, b); |
ceeb4318 | 12345 | |
e440a328 | 12346 | gogo->finish_function(location); |
12347 | ||
12348 | return Expression::make_func_reference(no, NULL, location); | |
12349 | } | |
12350 | ||
d751bb78 | 12351 | // Dump the ast for a selector expression. |
12352 | ||
12353 | void | |
12354 | Selector_expression::do_dump_expression(Ast_dump_context* ast_dump_context) | |
12355 | const | |
12356 | { | |
12357 | ast_dump_context->dump_expression(this->left_); | |
12358 | ast_dump_context->ostream() << "."; | |
12359 | ast_dump_context->ostream() << this->name_; | |
12360 | } | |
12361 | ||
e440a328 | 12362 | // Make a selector expression. |
12363 | ||
12364 | Expression* | |
12365 | Expression::make_selector(Expression* left, const std::string& name, | |
b13c66cd | 12366 | Location location) |
e440a328 | 12367 | { |
12368 | return new Selector_expression(left, name, location); | |
12369 | } | |
12370 | ||
da244e59 | 12371 | // Class Allocation_expression. |
e440a328 | 12372 | |
da244e59 | 12373 | int |
12374 | Allocation_expression::do_traverse(Traverse* traverse) | |
e440a328 | 12375 | { |
da244e59 | 12376 | return Type::traverse(this->type_, traverse); |
12377 | } | |
e440a328 | 12378 | |
da244e59 | 12379 | Type* |
12380 | Allocation_expression::do_type() | |
12381 | { | |
12382 | return Type::make_pointer_type(this->type_); | |
12383 | } | |
e440a328 | 12384 | |
22deed0d | 12385 | void |
12386 | Allocation_expression::do_check_types(Gogo*) | |
12387 | { | |
12388 | if (!this->type_->in_heap()) | |
12389 | go_error_at(this->location(), "can't heap allocate go:notinheap type"); | |
12390 | } | |
12391 | ||
da244e59 | 12392 | // Make a copy of an allocation expression. |
e440a328 | 12393 | |
da244e59 | 12394 | Expression* |
12395 | Allocation_expression::do_copy() | |
12396 | { | |
12397 | Allocation_expression* alloc = | |
12398 | new Allocation_expression(this->type_, this->location()); | |
12399 | if (this->allocate_on_stack_) | |
12400 | alloc->set_allocate_on_stack(); | |
12401 | return alloc; | |
12402 | } | |
e440a328 | 12403 | |
ea664253 | 12404 | // Return the backend representation for an allocation expression. |
e440a328 | 12405 | |
ea664253 | 12406 | Bexpression* |
12407 | Allocation_expression::do_get_backend(Translate_context* context) | |
e440a328 | 12408 | { |
2c809f8f | 12409 | Gogo* gogo = context->gogo(); |
12410 | Location loc = this->location(); | |
da244e59 | 12411 | |
45ff893b | 12412 | Node* n = Node::make_node(this); |
12413 | if (this->allocate_on_stack_ | |
12414 | || (n->encoding() & ESCAPE_MASK) == int(Node::ESCAPE_NONE)) | |
da244e59 | 12415 | { |
2a305b85 | 12416 | int64_t size; |
12417 | bool ok = this->type_->backend_type_size(gogo, &size); | |
12418 | if (!ok) | |
12419 | { | |
12420 | go_assert(saw_errors()); | |
12421 | return gogo->backend()->error_expression(); | |
12422 | } | |
d5d1c295 | 12423 | return gogo->backend()->stack_allocation_expression(size, loc); |
da244e59 | 12424 | } |
12425 | ||
2a305b85 | 12426 | Btype* btype = this->type_->get_backend(gogo); |
12427 | Bexpression* space = | |
ea664253 | 12428 | gogo->allocate_memory(this->type_, loc)->get_backend(context); |
d5d1c295 | 12429 | Btype* pbtype = gogo->backend()->pointer_type(btype); |
ea664253 | 12430 | return gogo->backend()->convert_expression(pbtype, space, loc); |
e440a328 | 12431 | } |
12432 | ||
d751bb78 | 12433 | // Dump ast representation for an allocation expression. |
12434 | ||
12435 | void | |
12436 | Allocation_expression::do_dump_expression(Ast_dump_context* ast_dump_context) | |
12437 | const | |
12438 | { | |
12439 | ast_dump_context->ostream() << "new("; | |
12440 | ast_dump_context->dump_type(this->type_); | |
12441 | ast_dump_context->ostream() << ")"; | |
12442 | } | |
12443 | ||
e440a328 | 12444 | // Make an allocation expression. |
12445 | ||
12446 | Expression* | |
b13c66cd | 12447 | Expression::make_allocation(Type* type, Location location) |
e440a328 | 12448 | { |
12449 | return new Allocation_expression(type, location); | |
12450 | } | |
12451 | ||
e32de7ba | 12452 | // Class Ordered_value_list. |
e440a328 | 12453 | |
12454 | int | |
e32de7ba | 12455 | Ordered_value_list::traverse_vals(Traverse* traverse) |
e440a328 | 12456 | { |
0c4f5a19 | 12457 | if (this->vals_ != NULL) |
12458 | { | |
12459 | if (this->traverse_order_ == NULL) | |
12460 | { | |
12461 | if (this->vals_->traverse(traverse) == TRAVERSE_EXIT) | |
12462 | return TRAVERSE_EXIT; | |
12463 | } | |
12464 | else | |
12465 | { | |
e32de7ba | 12466 | for (std::vector<unsigned long>::const_iterator p = |
12467 | this->traverse_order_->begin(); | |
0c4f5a19 | 12468 | p != this->traverse_order_->end(); |
12469 | ++p) | |
12470 | { | |
12471 | if (Expression::traverse(&this->vals_->at(*p), traverse) | |
12472 | == TRAVERSE_EXIT) | |
12473 | return TRAVERSE_EXIT; | |
12474 | } | |
12475 | } | |
12476 | } | |
e32de7ba | 12477 | return TRAVERSE_CONTINUE; |
12478 | } | |
12479 | ||
12480 | // Class Struct_construction_expression. | |
12481 | ||
12482 | // Traversal. | |
12483 | ||
12484 | int | |
12485 | Struct_construction_expression::do_traverse(Traverse* traverse) | |
12486 | { | |
12487 | if (this->traverse_vals(traverse) == TRAVERSE_EXIT) | |
12488 | return TRAVERSE_EXIT; | |
e440a328 | 12489 | if (Type::traverse(this->type_, traverse) == TRAVERSE_EXIT) |
12490 | return TRAVERSE_EXIT; | |
12491 | return TRAVERSE_CONTINUE; | |
12492 | } | |
12493 | ||
12494 | // Return whether this is a constant initializer. | |
12495 | ||
12496 | bool | |
12497 | Struct_construction_expression::is_constant_struct() const | |
12498 | { | |
e32de7ba | 12499 | if (this->vals() == NULL) |
e440a328 | 12500 | return true; |
e32de7ba | 12501 | for (Expression_list::const_iterator pv = this->vals()->begin(); |
12502 | pv != this->vals()->end(); | |
e440a328 | 12503 | ++pv) |
12504 | { | |
12505 | if (*pv != NULL | |
12506 | && !(*pv)->is_constant() | |
12507 | && (!(*pv)->is_composite_literal() | |
12508 | || (*pv)->is_nonconstant_composite_literal())) | |
12509 | return false; | |
12510 | } | |
12511 | ||
12512 | const Struct_field_list* fields = this->type_->struct_type()->fields(); | |
12513 | for (Struct_field_list::const_iterator pf = fields->begin(); | |
12514 | pf != fields->end(); | |
12515 | ++pf) | |
12516 | { | |
12517 | // There are no constant constructors for interfaces. | |
12518 | if (pf->type()->interface_type() != NULL) | |
12519 | return false; | |
12520 | } | |
12521 | ||
12522 | return true; | |
12523 | } | |
12524 | ||
3ae06f68 | 12525 | // Return whether this struct can be used as a constant initializer. |
f9ca30f9 | 12526 | |
12527 | bool | |
3ae06f68 | 12528 | Struct_construction_expression::do_is_static_initializer() const |
f9ca30f9 | 12529 | { |
e32de7ba | 12530 | if (this->vals() == NULL) |
f9ca30f9 | 12531 | return true; |
e32de7ba | 12532 | for (Expression_list::const_iterator pv = this->vals()->begin(); |
12533 | pv != this->vals()->end(); | |
f9ca30f9 | 12534 | ++pv) |
12535 | { | |
3ae06f68 | 12536 | if (*pv != NULL && !(*pv)->is_static_initializer()) |
f9ca30f9 | 12537 | return false; |
12538 | } | |
de048538 | 12539 | |
12540 | const Struct_field_list* fields = this->type_->struct_type()->fields(); | |
12541 | for (Struct_field_list::const_iterator pf = fields->begin(); | |
12542 | pf != fields->end(); | |
12543 | ++pf) | |
12544 | { | |
12545 | // There are no constant constructors for interfaces. | |
12546 | if (pf->type()->interface_type() != NULL) | |
12547 | return false; | |
12548 | } | |
12549 | ||
f9ca30f9 | 12550 | return true; |
12551 | } | |
12552 | ||
e440a328 | 12553 | // Final type determination. |
12554 | ||
12555 | void | |
12556 | Struct_construction_expression::do_determine_type(const Type_context*) | |
12557 | { | |
e32de7ba | 12558 | if (this->vals() == NULL) |
e440a328 | 12559 | return; |
12560 | const Struct_field_list* fields = this->type_->struct_type()->fields(); | |
e32de7ba | 12561 | Expression_list::const_iterator pv = this->vals()->begin(); |
e440a328 | 12562 | for (Struct_field_list::const_iterator pf = fields->begin(); |
12563 | pf != fields->end(); | |
12564 | ++pf, ++pv) | |
12565 | { | |
e32de7ba | 12566 | if (pv == this->vals()->end()) |
e440a328 | 12567 | return; |
12568 | if (*pv != NULL) | |
12569 | { | |
12570 | Type_context subcontext(pf->type(), false); | |
12571 | (*pv)->determine_type(&subcontext); | |
12572 | } | |
12573 | } | |
a6cb4c0e | 12574 | // Extra values are an error we will report elsewhere; we still want |
12575 | // to determine the type to avoid knockon errors. | |
e32de7ba | 12576 | for (; pv != this->vals()->end(); ++pv) |
a6cb4c0e | 12577 | (*pv)->determine_type_no_context(); |
e440a328 | 12578 | } |
12579 | ||
12580 | // Check types. | |
12581 | ||
12582 | void | |
12583 | Struct_construction_expression::do_check_types(Gogo*) | |
12584 | { | |
e32de7ba | 12585 | if (this->vals() == NULL) |
e440a328 | 12586 | return; |
12587 | ||
12588 | Struct_type* st = this->type_->struct_type(); | |
e32de7ba | 12589 | if (this->vals()->size() > st->field_count()) |
e440a328 | 12590 | { |
12591 | this->report_error(_("too many expressions for struct")); | |
12592 | return; | |
12593 | } | |
12594 | ||
12595 | const Struct_field_list* fields = st->fields(); | |
e32de7ba | 12596 | Expression_list::const_iterator pv = this->vals()->begin(); |
e440a328 | 12597 | int i = 0; |
12598 | for (Struct_field_list::const_iterator pf = fields->begin(); | |
12599 | pf != fields->end(); | |
12600 | ++pf, ++pv, ++i) | |
12601 | { | |
e32de7ba | 12602 | if (pv == this->vals()->end()) |
e440a328 | 12603 | { |
12604 | this->report_error(_("too few expressions for struct")); | |
12605 | break; | |
12606 | } | |
12607 | ||
12608 | if (*pv == NULL) | |
12609 | continue; | |
12610 | ||
12611 | std::string reason; | |
12612 | if (!Type::are_assignable(pf->type(), (*pv)->type(), &reason)) | |
12613 | { | |
12614 | if (reason.empty()) | |
631d5788 | 12615 | go_error_at((*pv)->location(), |
12616 | "incompatible type for field %d in struct construction", | |
12617 | i + 1); | |
e440a328 | 12618 | else |
631d5788 | 12619 | go_error_at((*pv)->location(), |
12620 | ("incompatible type for field %d in " | |
12621 | "struct construction (%s)"), | |
12622 | i + 1, reason.c_str()); | |
e440a328 | 12623 | this->set_is_error(); |
12624 | } | |
12625 | } | |
e32de7ba | 12626 | go_assert(pv == this->vals()->end()); |
e440a328 | 12627 | } |
12628 | ||
8ba8cc87 | 12629 | // Flatten a struct construction expression. Store the values into |
12630 | // temporaries in case they need interface conversion. | |
12631 | ||
12632 | Expression* | |
12633 | Struct_construction_expression::do_flatten(Gogo*, Named_object*, | |
12634 | Statement_inserter* inserter) | |
12635 | { | |
e32de7ba | 12636 | if (this->vals() == NULL) |
8ba8cc87 | 12637 | return this; |
12638 | ||
12639 | // If this is a constant struct, we don't need temporaries. | |
de048538 | 12640 | if (this->is_constant_struct() || this->is_static_initializer()) |
8ba8cc87 | 12641 | return this; |
12642 | ||
12643 | Location loc = this->location(); | |
e32de7ba | 12644 | for (Expression_list::iterator pv = this->vals()->begin(); |
12645 | pv != this->vals()->end(); | |
8ba8cc87 | 12646 | ++pv) |
12647 | { | |
12648 | if (*pv != NULL) | |
12649 | { | |
5bf8be8b | 12650 | if ((*pv)->is_error_expression() || (*pv)->type()->is_error_type()) |
12651 | { | |
12652 | go_assert(saw_errors()); | |
12653 | return Expression::make_error(loc); | |
12654 | } | |
8ba8cc87 | 12655 | if (!(*pv)->is_variable()) |
12656 | { | |
12657 | Temporary_statement* temp = | |
12658 | Statement::make_temporary(NULL, *pv, loc); | |
12659 | inserter->insert(temp); | |
12660 | *pv = Expression::make_temporary_reference(temp, loc); | |
12661 | } | |
12662 | } | |
12663 | } | |
12664 | return this; | |
12665 | } | |
12666 | ||
ea664253 | 12667 | // Return the backend representation for constructing a struct. |
e440a328 | 12668 | |
ea664253 | 12669 | Bexpression* |
12670 | Struct_construction_expression::do_get_backend(Translate_context* context) | |
e440a328 | 12671 | { |
12672 | Gogo* gogo = context->gogo(); | |
12673 | ||
2c809f8f | 12674 | Btype* btype = this->type_->get_backend(gogo); |
e32de7ba | 12675 | if (this->vals() == NULL) |
ea664253 | 12676 | return gogo->backend()->zero_expression(btype); |
e440a328 | 12677 | |
e440a328 | 12678 | const Struct_field_list* fields = this->type_->struct_type()->fields(); |
e32de7ba | 12679 | Expression_list::const_iterator pv = this->vals()->begin(); |
2c809f8f | 12680 | std::vector<Bexpression*> init; |
12681 | for (Struct_field_list::const_iterator pf = fields->begin(); | |
12682 | pf != fields->end(); | |
12683 | ++pf) | |
e440a328 | 12684 | { |
63697958 | 12685 | Btype* fbtype = pf->type()->get_backend(gogo); |
e32de7ba | 12686 | if (pv == this->vals()->end()) |
2c809f8f | 12687 | init.push_back(gogo->backend()->zero_expression(fbtype)); |
e440a328 | 12688 | else if (*pv == NULL) |
12689 | { | |
2c809f8f | 12690 | init.push_back(gogo->backend()->zero_expression(fbtype)); |
e440a328 | 12691 | ++pv; |
12692 | } | |
12693 | else | |
12694 | { | |
2c809f8f | 12695 | Expression* val = |
12696 | Expression::convert_for_assignment(gogo, pf->type(), | |
12697 | *pv, this->location()); | |
ea664253 | 12698 | init.push_back(val->get_backend(context)); |
e440a328 | 12699 | ++pv; |
12700 | } | |
e440a328 | 12701 | } |
ea664253 | 12702 | return gogo->backend()->constructor_expression(btype, init, this->location()); |
e440a328 | 12703 | } |
12704 | ||
12705 | // Export a struct construction. | |
12706 | ||
12707 | void | |
12708 | Struct_construction_expression::do_export(Export* exp) const | |
12709 | { | |
12710 | exp->write_c_string("convert("); | |
12711 | exp->write_type(this->type_); | |
e32de7ba | 12712 | for (Expression_list::const_iterator pv = this->vals()->begin(); |
12713 | pv != this->vals()->end(); | |
e440a328 | 12714 | ++pv) |
12715 | { | |
12716 | exp->write_c_string(", "); | |
12717 | if (*pv != NULL) | |
12718 | (*pv)->export_expression(exp); | |
12719 | } | |
12720 | exp->write_c_string(")"); | |
12721 | } | |
12722 | ||
d751bb78 | 12723 | // Dump ast representation of a struct construction expression. |
12724 | ||
12725 | void | |
12726 | Struct_construction_expression::do_dump_expression( | |
12727 | Ast_dump_context* ast_dump_context) const | |
12728 | { | |
d751bb78 | 12729 | ast_dump_context->dump_type(this->type_); |
12730 | ast_dump_context->ostream() << "{"; | |
e32de7ba | 12731 | ast_dump_context->dump_expression_list(this->vals()); |
d751bb78 | 12732 | ast_dump_context->ostream() << "}"; |
12733 | } | |
12734 | ||
e440a328 | 12735 | // Make a struct composite literal. This used by the thunk code. |
12736 | ||
12737 | Expression* | |
12738 | Expression::make_struct_composite_literal(Type* type, Expression_list* vals, | |
b13c66cd | 12739 | Location location) |
e440a328 | 12740 | { |
c484d925 | 12741 | go_assert(type->struct_type() != NULL); |
e440a328 | 12742 | return new Struct_construction_expression(type, vals, location); |
12743 | } | |
12744 | ||
da244e59 | 12745 | // Class Array_construction_expression. |
e440a328 | 12746 | |
12747 | // Traversal. | |
12748 | ||
12749 | int | |
12750 | Array_construction_expression::do_traverse(Traverse* traverse) | |
12751 | { | |
e32de7ba | 12752 | if (this->traverse_vals(traverse) == TRAVERSE_EXIT) |
e440a328 | 12753 | return TRAVERSE_EXIT; |
12754 | if (Type::traverse(this->type_, traverse) == TRAVERSE_EXIT) | |
12755 | return TRAVERSE_EXIT; | |
12756 | return TRAVERSE_CONTINUE; | |
12757 | } | |
12758 | ||
12759 | // Return whether this is a constant initializer. | |
12760 | ||
12761 | bool | |
12762 | Array_construction_expression::is_constant_array() const | |
12763 | { | |
e32de7ba | 12764 | if (this->vals() == NULL) |
e440a328 | 12765 | return true; |
12766 | ||
12767 | // There are no constant constructors for interfaces. | |
12768 | if (this->type_->array_type()->element_type()->interface_type() != NULL) | |
12769 | return false; | |
12770 | ||
e32de7ba | 12771 | for (Expression_list::const_iterator pv = this->vals()->begin(); |
12772 | pv != this->vals()->end(); | |
e440a328 | 12773 | ++pv) |
12774 | { | |
12775 | if (*pv != NULL | |
12776 | && !(*pv)->is_constant() | |
12777 | && (!(*pv)->is_composite_literal() | |
12778 | || (*pv)->is_nonconstant_composite_literal())) | |
12779 | return false; | |
12780 | } | |
12781 | return true; | |
12782 | } | |
12783 | ||
3ae06f68 | 12784 | // Return whether this can be used a constant initializer. |
f9ca30f9 | 12785 | |
12786 | bool | |
3ae06f68 | 12787 | Array_construction_expression::do_is_static_initializer() const |
f9ca30f9 | 12788 | { |
e32de7ba | 12789 | if (this->vals() == NULL) |
f9ca30f9 | 12790 | return true; |
de048538 | 12791 | |
12792 | // There are no constant constructors for interfaces. | |
12793 | if (this->type_->array_type()->element_type()->interface_type() != NULL) | |
12794 | return false; | |
12795 | ||
e32de7ba | 12796 | for (Expression_list::const_iterator pv = this->vals()->begin(); |
12797 | pv != this->vals()->end(); | |
f9ca30f9 | 12798 | ++pv) |
12799 | { | |
3ae06f68 | 12800 | if (*pv != NULL && !(*pv)->is_static_initializer()) |
f9ca30f9 | 12801 | return false; |
12802 | } | |
12803 | return true; | |
12804 | } | |
12805 | ||
e440a328 | 12806 | // Final type determination. |
12807 | ||
12808 | void | |
12809 | Array_construction_expression::do_determine_type(const Type_context*) | |
12810 | { | |
e32de7ba | 12811 | if (this->vals() == NULL) |
e440a328 | 12812 | return; |
12813 | Type_context subcontext(this->type_->array_type()->element_type(), false); | |
e32de7ba | 12814 | for (Expression_list::const_iterator pv = this->vals()->begin(); |
12815 | pv != this->vals()->end(); | |
e440a328 | 12816 | ++pv) |
12817 | { | |
12818 | if (*pv != NULL) | |
12819 | (*pv)->determine_type(&subcontext); | |
12820 | } | |
12821 | } | |
12822 | ||
12823 | // Check types. | |
12824 | ||
12825 | void | |
12826 | Array_construction_expression::do_check_types(Gogo*) | |
12827 | { | |
e32de7ba | 12828 | if (this->vals() == NULL) |
e440a328 | 12829 | return; |
12830 | ||
12831 | Array_type* at = this->type_->array_type(); | |
12832 | int i = 0; | |
12833 | Type* element_type = at->element_type(); | |
e32de7ba | 12834 | for (Expression_list::const_iterator pv = this->vals()->begin(); |
12835 | pv != this->vals()->end(); | |
e440a328 | 12836 | ++pv, ++i) |
12837 | { | |
12838 | if (*pv != NULL | |
12839 | && !Type::are_assignable(element_type, (*pv)->type(), NULL)) | |
12840 | { | |
631d5788 | 12841 | go_error_at((*pv)->location(), |
12842 | "incompatible type for element %d in composite literal", | |
12843 | i + 1); | |
e440a328 | 12844 | this->set_is_error(); |
12845 | } | |
12846 | } | |
e440a328 | 12847 | } |
12848 | ||
8ba8cc87 | 12849 | // Flatten an array construction expression. Store the values into |
12850 | // temporaries in case they need interface conversion. | |
12851 | ||
12852 | Expression* | |
12853 | Array_construction_expression::do_flatten(Gogo*, Named_object*, | |
12854 | Statement_inserter* inserter) | |
12855 | { | |
e32de7ba | 12856 | if (this->vals() == NULL) |
8ba8cc87 | 12857 | return this; |
12858 | ||
12859 | // If this is a constant array, we don't need temporaries. | |
de048538 | 12860 | if (this->is_constant_array() || this->is_static_initializer()) |
8ba8cc87 | 12861 | return this; |
12862 | ||
12863 | Location loc = this->location(); | |
e32de7ba | 12864 | for (Expression_list::iterator pv = this->vals()->begin(); |
12865 | pv != this->vals()->end(); | |
8ba8cc87 | 12866 | ++pv) |
12867 | { | |
12868 | if (*pv != NULL) | |
12869 | { | |
5bf8be8b | 12870 | if ((*pv)->is_error_expression() || (*pv)->type()->is_error_type()) |
12871 | { | |
12872 | go_assert(saw_errors()); | |
12873 | return Expression::make_error(loc); | |
12874 | } | |
8ba8cc87 | 12875 | if (!(*pv)->is_variable()) |
12876 | { | |
12877 | Temporary_statement* temp = | |
12878 | Statement::make_temporary(NULL, *pv, loc); | |
12879 | inserter->insert(temp); | |
12880 | *pv = Expression::make_temporary_reference(temp, loc); | |
12881 | } | |
12882 | } | |
12883 | } | |
12884 | return this; | |
12885 | } | |
12886 | ||
2c809f8f | 12887 | // Get a constructor expression for the array values. |
e440a328 | 12888 | |
2c809f8f | 12889 | Bexpression* |
12890 | Array_construction_expression::get_constructor(Translate_context* context, | |
12891 | Btype* array_btype) | |
e440a328 | 12892 | { |
e440a328 | 12893 | Type* element_type = this->type_->array_type()->element_type(); |
2c809f8f | 12894 | |
12895 | std::vector<unsigned long> indexes; | |
12896 | std::vector<Bexpression*> vals; | |
12897 | Gogo* gogo = context->gogo(); | |
e32de7ba | 12898 | if (this->vals() != NULL) |
e440a328 | 12899 | { |
12900 | size_t i = 0; | |
ffe743ca | 12901 | std::vector<unsigned long>::const_iterator pi; |
12902 | if (this->indexes_ != NULL) | |
12903 | pi = this->indexes_->begin(); | |
e32de7ba | 12904 | for (Expression_list::const_iterator pv = this->vals()->begin(); |
12905 | pv != this->vals()->end(); | |
e440a328 | 12906 | ++pv, ++i) |
12907 | { | |
ffe743ca | 12908 | if (this->indexes_ != NULL) |
12909 | go_assert(pi != this->indexes_->end()); | |
ffe743ca | 12910 | |
12911 | if (this->indexes_ == NULL) | |
2c809f8f | 12912 | indexes.push_back(i); |
ffe743ca | 12913 | else |
2c809f8f | 12914 | indexes.push_back(*pi); |
e440a328 | 12915 | if (*pv == NULL) |
63697958 | 12916 | { |
63697958 | 12917 | Btype* ebtype = element_type->get_backend(gogo); |
12918 | Bexpression *zv = gogo->backend()->zero_expression(ebtype); | |
2c809f8f | 12919 | vals.push_back(zv); |
63697958 | 12920 | } |
e440a328 | 12921 | else |
12922 | { | |
2c809f8f | 12923 | Expression* val_expr = |
12924 | Expression::convert_for_assignment(gogo, element_type, *pv, | |
12925 | this->location()); | |
ea664253 | 12926 | vals.push_back(val_expr->get_backend(context)); |
e440a328 | 12927 | } |
ffe743ca | 12928 | if (this->indexes_ != NULL) |
12929 | ++pi; | |
e440a328 | 12930 | } |
ffe743ca | 12931 | if (this->indexes_ != NULL) |
12932 | go_assert(pi == this->indexes_->end()); | |
e440a328 | 12933 | } |
2c809f8f | 12934 | return gogo->backend()->array_constructor_expression(array_btype, indexes, |
12935 | vals, this->location()); | |
e440a328 | 12936 | } |
12937 | ||
12938 | // Export an array construction. | |
12939 | ||
12940 | void | |
12941 | Array_construction_expression::do_export(Export* exp) const | |
12942 | { | |
12943 | exp->write_c_string("convert("); | |
12944 | exp->write_type(this->type_); | |
e32de7ba | 12945 | if (this->vals() != NULL) |
e440a328 | 12946 | { |
ffe743ca | 12947 | std::vector<unsigned long>::const_iterator pi; |
12948 | if (this->indexes_ != NULL) | |
12949 | pi = this->indexes_->begin(); | |
e32de7ba | 12950 | for (Expression_list::const_iterator pv = this->vals()->begin(); |
12951 | pv != this->vals()->end(); | |
e440a328 | 12952 | ++pv) |
12953 | { | |
12954 | exp->write_c_string(", "); | |
ffe743ca | 12955 | |
12956 | if (this->indexes_ != NULL) | |
12957 | { | |
12958 | char buf[100]; | |
12959 | snprintf(buf, sizeof buf, "%lu", *pi); | |
12960 | exp->write_c_string(buf); | |
12961 | exp->write_c_string(":"); | |
12962 | } | |
12963 | ||
e440a328 | 12964 | if (*pv != NULL) |
12965 | (*pv)->export_expression(exp); | |
ffe743ca | 12966 | |
12967 | if (this->indexes_ != NULL) | |
12968 | ++pi; | |
e440a328 | 12969 | } |
12970 | } | |
12971 | exp->write_c_string(")"); | |
12972 | } | |
12973 | ||
0e9a2e72 | 12974 | // Dump ast representation of an array construction expression. |
d751bb78 | 12975 | |
12976 | void | |
12977 | Array_construction_expression::do_dump_expression( | |
12978 | Ast_dump_context* ast_dump_context) const | |
12979 | { | |
ffe743ca | 12980 | Expression* length = this->type_->array_type()->length(); |
8b1c301d | 12981 | |
12982 | ast_dump_context->ostream() << "[" ; | |
12983 | if (length != NULL) | |
12984 | { | |
12985 | ast_dump_context->dump_expression(length); | |
12986 | } | |
12987 | ast_dump_context->ostream() << "]" ; | |
d751bb78 | 12988 | ast_dump_context->dump_type(this->type_); |
0e9a2e72 | 12989 | this->dump_slice_storage_expression(ast_dump_context); |
d751bb78 | 12990 | ast_dump_context->ostream() << "{" ; |
ffe743ca | 12991 | if (this->indexes_ == NULL) |
e32de7ba | 12992 | ast_dump_context->dump_expression_list(this->vals()); |
ffe743ca | 12993 | else |
12994 | { | |
e32de7ba | 12995 | Expression_list::const_iterator pv = this->vals()->begin(); |
ffe743ca | 12996 | for (std::vector<unsigned long>::const_iterator pi = |
12997 | this->indexes_->begin(); | |
12998 | pi != this->indexes_->end(); | |
12999 | ++pi, ++pv) | |
13000 | { | |
13001 | if (pi != this->indexes_->begin()) | |
13002 | ast_dump_context->ostream() << ", "; | |
13003 | ast_dump_context->ostream() << *pi << ':'; | |
13004 | ast_dump_context->dump_expression(*pv); | |
13005 | } | |
13006 | } | |
d751bb78 | 13007 | ast_dump_context->ostream() << "}" ; |
13008 | ||
13009 | } | |
13010 | ||
da244e59 | 13011 | // Class Fixed_array_construction_expression. |
e440a328 | 13012 | |
da244e59 | 13013 | Fixed_array_construction_expression::Fixed_array_construction_expression( |
13014 | Type* type, const std::vector<unsigned long>* indexes, | |
13015 | Expression_list* vals, Location location) | |
13016 | : Array_construction_expression(EXPRESSION_FIXED_ARRAY_CONSTRUCTION, | |
13017 | type, indexes, vals, location) | |
13018 | { go_assert(type->array_type() != NULL && !type->is_slice_type()); } | |
e440a328 | 13019 | |
ea664253 | 13020 | // Return the backend representation for constructing a fixed array. |
e440a328 | 13021 | |
ea664253 | 13022 | Bexpression* |
13023 | Fixed_array_construction_expression::do_get_backend(Translate_context* context) | |
e440a328 | 13024 | { |
9f0e0513 | 13025 | Type* type = this->type(); |
13026 | Btype* btype = type->get_backend(context->gogo()); | |
ea664253 | 13027 | return this->get_constructor(context, btype); |
e440a328 | 13028 | } |
13029 | ||
76f85fd6 | 13030 | Expression* |
13031 | Expression::make_array_composite_literal(Type* type, Expression_list* vals, | |
13032 | Location location) | |
13033 | { | |
13034 | go_assert(type->array_type() != NULL && !type->is_slice_type()); | |
13035 | return new Fixed_array_construction_expression(type, NULL, vals, location); | |
13036 | } | |
13037 | ||
da244e59 | 13038 | // Class Slice_construction_expression. |
e440a328 | 13039 | |
da244e59 | 13040 | Slice_construction_expression::Slice_construction_expression( |
13041 | Type* type, const std::vector<unsigned long>* indexes, | |
13042 | Expression_list* vals, Location location) | |
13043 | : Array_construction_expression(EXPRESSION_SLICE_CONSTRUCTION, | |
13044 | type, indexes, vals, location), | |
0e9a2e72 | 13045 | valtype_(NULL), array_val_(NULL), slice_storage_(NULL), |
13046 | storage_escapes_(true) | |
e440a328 | 13047 | { |
da244e59 | 13048 | go_assert(type->is_slice_type()); |
23d77f91 | 13049 | |
da244e59 | 13050 | unsigned long lenval; |
13051 | Expression* length; | |
13052 | if (vals == NULL || vals->empty()) | |
13053 | lenval = 0; | |
13054 | else | |
13055 | { | |
13056 | if (this->indexes() == NULL) | |
13057 | lenval = vals->size(); | |
13058 | else | |
13059 | lenval = indexes->back() + 1; | |
13060 | } | |
13061 | Type* int_type = Type::lookup_integer_type("int"); | |
13062 | length = Expression::make_integer_ul(lenval, int_type, location); | |
13063 | Type* element_type = type->array_type()->element_type(); | |
6bf4793c | 13064 | Array_type* array_type = Type::make_array_type(element_type, length); |
13065 | array_type->set_is_array_incomparable(); | |
13066 | this->valtype_ = array_type; | |
da244e59 | 13067 | } |
e440a328 | 13068 | |
23d77f91 | 13069 | // Traversal. |
13070 | ||
13071 | int | |
13072 | Slice_construction_expression::do_traverse(Traverse* traverse) | |
13073 | { | |
13074 | if (this->Array_construction_expression::do_traverse(traverse) | |
13075 | == TRAVERSE_EXIT) | |
13076 | return TRAVERSE_EXIT; | |
13077 | if (Type::traverse(this->valtype_, traverse) == TRAVERSE_EXIT) | |
13078 | return TRAVERSE_EXIT; | |
0e9a2e72 | 13079 | if (this->array_val_ != NULL |
13080 | && Expression::traverse(&this->array_val_, traverse) == TRAVERSE_EXIT) | |
13081 | return TRAVERSE_EXIT; | |
13082 | if (this->slice_storage_ != NULL | |
13083 | && Expression::traverse(&this->slice_storage_, traverse) == TRAVERSE_EXIT) | |
13084 | return TRAVERSE_EXIT; | |
23d77f91 | 13085 | return TRAVERSE_CONTINUE; |
13086 | } | |
13087 | ||
0e9a2e72 | 13088 | // Helper routine to create fixed array value underlying the slice literal. |
13089 | // May be called during flattening, or later during do_get_backend(). | |
e440a328 | 13090 | |
0e9a2e72 | 13091 | Expression* |
13092 | Slice_construction_expression::create_array_val() | |
e440a328 | 13093 | { |
f9c68f17 | 13094 | Array_type* array_type = this->type()->array_type(); |
13095 | if (array_type == NULL) | |
13096 | { | |
c484d925 | 13097 | go_assert(this->type()->is_error()); |
0e9a2e72 | 13098 | return NULL; |
f9c68f17 | 13099 | } |
13100 | ||
f23d7786 | 13101 | Location loc = this->location(); |
23d77f91 | 13102 | go_assert(this->valtype_ != NULL); |
3d60812e | 13103 | |
f23d7786 | 13104 | Expression_list* vals = this->vals(); |
0e9a2e72 | 13105 | return new Fixed_array_construction_expression( |
13106 | this->valtype_, this->indexes(), vals, loc); | |
13107 | } | |
13108 | ||
13109 | // If we're previous established that the slice storage does not | |
13110 | // escape, then create a separate array temp val here for it. We | |
13111 | // need to do this as part of flattening so as to be able to insert | |
13112 | // the new temp statement. | |
13113 | ||
13114 | Expression* | |
13115 | Slice_construction_expression::do_flatten(Gogo* gogo, Named_object* no, | |
13116 | Statement_inserter* inserter) | |
13117 | { | |
13118 | if (this->type()->array_type() == NULL) | |
13119 | return NULL; | |
13120 | ||
13121 | // Base class flattening first | |
13122 | this->Array_construction_expression::do_flatten(gogo, no, inserter); | |
13123 | ||
a1bbc2c3 | 13124 | // Create a stack-allocated storage temp if storage won't escape |
03118c21 | 13125 | if (!this->storage_escapes_ |
13126 | && this->slice_storage_ == NULL | |
13127 | && this->element_count() > 0) | |
0e9a2e72 | 13128 | { |
13129 | Location loc = this->location(); | |
03118c21 | 13130 | this->array_val_ = this->create_array_val(); |
0e9a2e72 | 13131 | go_assert(this->array_val_); |
13132 | Temporary_statement* temp = | |
13133 | Statement::make_temporary(this->valtype_, this->array_val_, loc); | |
13134 | inserter->insert(temp); | |
13135 | this->slice_storage_ = Expression::make_temporary_reference(temp, loc); | |
13136 | } | |
13137 | return this; | |
13138 | } | |
13139 | ||
13140 | // When dumping a slice construction expression that has an explicit | |
13141 | // storeage temp, emit the temp here (if we don't do this the storage | |
13142 | // temp appears unused in the AST dump). | |
13143 | ||
13144 | void | |
13145 | Slice_construction_expression:: | |
13146 | dump_slice_storage_expression(Ast_dump_context* ast_dump_context) const | |
13147 | { | |
13148 | if (this->slice_storage_ == NULL) | |
13149 | return; | |
13150 | ast_dump_context->ostream() << "storage=" ; | |
13151 | ast_dump_context->dump_expression(this->slice_storage_); | |
13152 | } | |
13153 | ||
13154 | // Return the backend representation for constructing a slice. | |
13155 | ||
13156 | Bexpression* | |
13157 | Slice_construction_expression::do_get_backend(Translate_context* context) | |
13158 | { | |
13159 | if (this->array_val_ == NULL) | |
03118c21 | 13160 | this->array_val_ = this->create_array_val(); |
0e9a2e72 | 13161 | if (this->array_val_ == NULL) |
13162 | { | |
13163 | go_assert(this->type()->is_error()); | |
13164 | return context->backend()->error_expression(); | |
13165 | } | |
13166 | ||
13167 | Location loc = this->location(); | |
e440a328 | 13168 | |
3ae06f68 | 13169 | bool is_static_initializer = this->array_val_->is_static_initializer(); |
d8829beb | 13170 | |
13171 | // We have to copy the initial values into heap memory if we are in | |
3ae06f68 | 13172 | // a function or if the values are not constants. |
13173 | bool copy_to_heap = context->function() != NULL || !is_static_initializer; | |
e440a328 | 13174 | |
f23d7786 | 13175 | Expression* space; |
0e9a2e72 | 13176 | |
13177 | if (this->slice_storage_ != NULL) | |
13178 | { | |
13179 | go_assert(!this->storage_escapes_); | |
13180 | space = Expression::make_unary(OPERATOR_AND, this->slice_storage_, loc); | |
13181 | } | |
13182 | else if (!copy_to_heap) | |
e440a328 | 13183 | { |
f23d7786 | 13184 | // The initializer will only run once. |
0e9a2e72 | 13185 | space = Expression::make_unary(OPERATOR_AND, this->array_val_, loc); |
f23d7786 | 13186 | space->unary_expression()->set_is_slice_init(); |
e440a328 | 13187 | } |
13188 | else | |
45ff893b | 13189 | { |
0e9a2e72 | 13190 | space = Expression::make_heap_expression(this->array_val_, loc); |
45ff893b | 13191 | Node* n = Node::make_node(this); |
13192 | if ((n->encoding() & ESCAPE_MASK) == int(Node::ESCAPE_NONE)) | |
13193 | { | |
13194 | n = Node::make_node(space); | |
13195 | n->set_encoding(Node::ESCAPE_NONE); | |
13196 | } | |
13197 | } | |
e440a328 | 13198 | |
2c809f8f | 13199 | // Build a constructor for the slice. |
f23d7786 | 13200 | Expression* len = this->valtype_->array_type()->length(); |
13201 | Expression* slice_val = | |
13202 | Expression::make_slice_value(this->type(), space, len, len, loc); | |
ea664253 | 13203 | return slice_val->get_backend(context); |
e440a328 | 13204 | } |
13205 | ||
13206 | // Make a slice composite literal. This is used by the type | |
13207 | // descriptor code. | |
13208 | ||
0e9a2e72 | 13209 | Slice_construction_expression* |
e440a328 | 13210 | Expression::make_slice_composite_literal(Type* type, Expression_list* vals, |
b13c66cd | 13211 | Location location) |
e440a328 | 13212 | { |
411eb89e | 13213 | go_assert(type->is_slice_type()); |
2c809f8f | 13214 | return new Slice_construction_expression(type, NULL, vals, location); |
e440a328 | 13215 | } |
13216 | ||
da244e59 | 13217 | // Class Map_construction_expression. |
e440a328 | 13218 | |
13219 | // Traversal. | |
13220 | ||
13221 | int | |
13222 | Map_construction_expression::do_traverse(Traverse* traverse) | |
13223 | { | |
13224 | if (this->vals_ != NULL | |
13225 | && this->vals_->traverse(traverse) == TRAVERSE_EXIT) | |
13226 | return TRAVERSE_EXIT; | |
13227 | if (Type::traverse(this->type_, traverse) == TRAVERSE_EXIT) | |
13228 | return TRAVERSE_EXIT; | |
13229 | return TRAVERSE_CONTINUE; | |
13230 | } | |
13231 | ||
2c809f8f | 13232 | // Flatten constructor initializer into a temporary variable since |
13233 | // we need to take its address for __go_construct_map. | |
13234 | ||
13235 | Expression* | |
13236 | Map_construction_expression::do_flatten(Gogo* gogo, Named_object*, | |
13237 | Statement_inserter* inserter) | |
13238 | { | |
13239 | if (!this->is_error_expression() | |
13240 | && this->vals_ != NULL | |
13241 | && !this->vals_->empty() | |
13242 | && this->constructor_temp_ == NULL) | |
13243 | { | |
13244 | Map_type* mt = this->type_->map_type(); | |
13245 | Type* key_type = mt->key_type(); | |
13246 | Type* val_type = mt->val_type(); | |
13247 | this->element_type_ = Type::make_builtin_struct_type(2, | |
13248 | "__key", key_type, | |
13249 | "__val", val_type); | |
13250 | ||
13251 | Expression_list* value_pairs = new Expression_list(); | |
13252 | Location loc = this->location(); | |
13253 | ||
13254 | size_t i = 0; | |
13255 | for (Expression_list::const_iterator pv = this->vals_->begin(); | |
13256 | pv != this->vals_->end(); | |
13257 | ++pv, ++i) | |
13258 | { | |
13259 | Expression_list* key_value_pair = new Expression_list(); | |
91c0fd76 | 13260 | Expression* key = *pv; |
5bf8be8b | 13261 | if (key->is_error_expression() || key->type()->is_error_type()) |
13262 | { | |
13263 | go_assert(saw_errors()); | |
13264 | return Expression::make_error(loc); | |
13265 | } | |
91c0fd76 | 13266 | if (key->type()->interface_type() != NULL && !key->is_variable()) |
13267 | { | |
13268 | Temporary_statement* temp = | |
13269 | Statement::make_temporary(NULL, key, loc); | |
13270 | inserter->insert(temp); | |
13271 | key = Expression::make_temporary_reference(temp, loc); | |
13272 | } | |
13273 | key = Expression::convert_for_assignment(gogo, key_type, key, loc); | |
2c809f8f | 13274 | |
13275 | ++pv; | |
91c0fd76 | 13276 | Expression* val = *pv; |
5bf8be8b | 13277 | if (val->is_error_expression() || val->type()->is_error_type()) |
13278 | { | |
13279 | go_assert(saw_errors()); | |
13280 | return Expression::make_error(loc); | |
13281 | } | |
91c0fd76 | 13282 | if (val->type()->interface_type() != NULL && !val->is_variable()) |
13283 | { | |
13284 | Temporary_statement* temp = | |
13285 | Statement::make_temporary(NULL, val, loc); | |
13286 | inserter->insert(temp); | |
13287 | val = Expression::make_temporary_reference(temp, loc); | |
13288 | } | |
13289 | val = Expression::convert_for_assignment(gogo, val_type, val, loc); | |
2c809f8f | 13290 | |
13291 | key_value_pair->push_back(key); | |
13292 | key_value_pair->push_back(val); | |
13293 | value_pairs->push_back( | |
13294 | Expression::make_struct_composite_literal(this->element_type_, | |
13295 | key_value_pair, loc)); | |
13296 | } | |
13297 | ||
e67508fa | 13298 | Expression* element_count = Expression::make_integer_ul(i, NULL, loc); |
6bf4793c | 13299 | Array_type* ctor_type = |
2c809f8f | 13300 | Type::make_array_type(this->element_type_, element_count); |
6bf4793c | 13301 | ctor_type->set_is_array_incomparable(); |
2c809f8f | 13302 | Expression* constructor = |
13303 | new Fixed_array_construction_expression(ctor_type, NULL, | |
13304 | value_pairs, loc); | |
13305 | ||
13306 | this->constructor_temp_ = | |
13307 | Statement::make_temporary(NULL, constructor, loc); | |
13308 | constructor->issue_nil_check(); | |
13309 | this->constructor_temp_->set_is_address_taken(); | |
13310 | inserter->insert(this->constructor_temp_); | |
13311 | } | |
13312 | ||
13313 | return this; | |
13314 | } | |
13315 | ||
e440a328 | 13316 | // Final type determination. |
13317 | ||
13318 | void | |
13319 | Map_construction_expression::do_determine_type(const Type_context*) | |
13320 | { | |
13321 | if (this->vals_ == NULL) | |
13322 | return; | |
13323 | ||
13324 | Map_type* mt = this->type_->map_type(); | |
13325 | Type_context key_context(mt->key_type(), false); | |
13326 | Type_context val_context(mt->val_type(), false); | |
13327 | for (Expression_list::const_iterator pv = this->vals_->begin(); | |
13328 | pv != this->vals_->end(); | |
13329 | ++pv) | |
13330 | { | |
13331 | (*pv)->determine_type(&key_context); | |
13332 | ++pv; | |
13333 | (*pv)->determine_type(&val_context); | |
13334 | } | |
13335 | } | |
13336 | ||
13337 | // Check types. | |
13338 | ||
13339 | void | |
13340 | Map_construction_expression::do_check_types(Gogo*) | |
13341 | { | |
13342 | if (this->vals_ == NULL) | |
13343 | return; | |
13344 | ||
13345 | Map_type* mt = this->type_->map_type(); | |
13346 | int i = 0; | |
13347 | Type* key_type = mt->key_type(); | |
13348 | Type* val_type = mt->val_type(); | |
13349 | for (Expression_list::const_iterator pv = this->vals_->begin(); | |
13350 | pv != this->vals_->end(); | |
13351 | ++pv, ++i) | |
13352 | { | |
13353 | if (!Type::are_assignable(key_type, (*pv)->type(), NULL)) | |
13354 | { | |
631d5788 | 13355 | go_error_at((*pv)->location(), |
13356 | "incompatible type for element %d key in map construction", | |
13357 | i + 1); | |
e440a328 | 13358 | this->set_is_error(); |
13359 | } | |
13360 | ++pv; | |
13361 | if (!Type::are_assignable(val_type, (*pv)->type(), NULL)) | |
13362 | { | |
631d5788 | 13363 | go_error_at((*pv)->location(), |
13364 | ("incompatible type for element %d value " | |
13365 | "in map construction"), | |
e440a328 | 13366 | i + 1); |
13367 | this->set_is_error(); | |
13368 | } | |
13369 | } | |
13370 | } | |
13371 | ||
ea664253 | 13372 | // Return the backend representation for constructing a map. |
e440a328 | 13373 | |
ea664253 | 13374 | Bexpression* |
13375 | Map_construction_expression::do_get_backend(Translate_context* context) | |
e440a328 | 13376 | { |
2c809f8f | 13377 | if (this->is_error_expression()) |
ea664253 | 13378 | return context->backend()->error_expression(); |
2c809f8f | 13379 | Location loc = this->location(); |
e440a328 | 13380 | |
e440a328 | 13381 | size_t i = 0; |
2c809f8f | 13382 | Expression* ventries; |
e440a328 | 13383 | if (this->vals_ == NULL || this->vals_->empty()) |
2c809f8f | 13384 | ventries = Expression::make_nil(loc); |
e440a328 | 13385 | else |
13386 | { | |
2c809f8f | 13387 | go_assert(this->constructor_temp_ != NULL); |
13388 | i = this->vals_->size() / 2; | |
e440a328 | 13389 | |
2c809f8f | 13390 | Expression* ctor_ref = |
13391 | Expression::make_temporary_reference(this->constructor_temp_, loc); | |
13392 | ventries = Expression::make_unary(OPERATOR_AND, ctor_ref, loc); | |
13393 | } | |
e440a328 | 13394 | |
2c809f8f | 13395 | Map_type* mt = this->type_->map_type(); |
13396 | if (this->element_type_ == NULL) | |
13397 | this->element_type_ = | |
13398 | Type::make_builtin_struct_type(2, | |
13399 | "__key", mt->key_type(), | |
13400 | "__val", mt->val_type()); | |
0d5530d9 | 13401 | Expression* descriptor = Expression::make_type_descriptor(mt, loc); |
2c809f8f | 13402 | |
13403 | Type* uintptr_t = Type::lookup_integer_type("uintptr"); | |
e67508fa | 13404 | Expression* count = Expression::make_integer_ul(i, uintptr_t, loc); |
2c809f8f | 13405 | |
13406 | Expression* entry_size = | |
13407 | Expression::make_type_info(this->element_type_, TYPE_INFO_SIZE); | |
13408 | ||
13409 | unsigned int field_index; | |
13410 | const Struct_field* valfield = | |
13411 | this->element_type_->find_local_field("__val", &field_index); | |
13412 | Expression* val_offset = | |
13413 | Expression::make_struct_field_offset(this->element_type_, valfield); | |
2c809f8f | 13414 | |
13415 | Expression* map_ctor = | |
0d5530d9 | 13416 | Runtime::make_call(Runtime::CONSTRUCT_MAP, loc, 5, descriptor, count, |
13417 | entry_size, val_offset, ventries); | |
ea664253 | 13418 | return map_ctor->get_backend(context); |
2c809f8f | 13419 | } |
e440a328 | 13420 | |
2c809f8f | 13421 | // Export an array construction. |
e440a328 | 13422 | |
2c809f8f | 13423 | void |
13424 | Map_construction_expression::do_export(Export* exp) const | |
13425 | { | |
13426 | exp->write_c_string("convert("); | |
13427 | exp->write_type(this->type_); | |
13428 | for (Expression_list::const_iterator pv = this->vals_->begin(); | |
13429 | pv != this->vals_->end(); | |
13430 | ++pv) | |
13431 | { | |
13432 | exp->write_c_string(", "); | |
13433 | (*pv)->export_expression(exp); | |
13434 | } | |
13435 | exp->write_c_string(")"); | |
13436 | } | |
e440a328 | 13437 | |
2c809f8f | 13438 | // Dump ast representation for a map construction expression. |
d751bb78 | 13439 | |
13440 | void | |
13441 | Map_construction_expression::do_dump_expression( | |
13442 | Ast_dump_context* ast_dump_context) const | |
13443 | { | |
d751bb78 | 13444 | ast_dump_context->ostream() << "{" ; |
8b1c301d | 13445 | ast_dump_context->dump_expression_list(this->vals_, true); |
d751bb78 | 13446 | ast_dump_context->ostream() << "}"; |
13447 | } | |
13448 | ||
7795ac51 | 13449 | // Class Composite_literal_expression. |
e440a328 | 13450 | |
13451 | // Traversal. | |
13452 | ||
13453 | int | |
13454 | Composite_literal_expression::do_traverse(Traverse* traverse) | |
13455 | { | |
dbffccfc | 13456 | if (Type::traverse(this->type_, traverse) == TRAVERSE_EXIT) |
e440a328 | 13457 | return TRAVERSE_EXIT; |
dbffccfc | 13458 | |
13459 | // If this is a struct composite literal with keys, then the keys | |
13460 | // are field names, not expressions. We don't want to traverse them | |
13461 | // in that case. If we do, we can give an erroneous error "variable | |
13462 | // initializer refers to itself." See bug482.go in the testsuite. | |
13463 | if (this->has_keys_ && this->vals_ != NULL) | |
13464 | { | |
13465 | // The type may not be resolvable at this point. | |
13466 | Type* type = this->type_; | |
a01f2481 | 13467 | |
7795ac51 | 13468 | for (int depth = 0; depth < this->depth_; ++depth) |
a01f2481 | 13469 | { |
13470 | if (type->array_type() != NULL) | |
13471 | type = type->array_type()->element_type(); | |
13472 | else if (type->map_type() != NULL) | |
7795ac51 | 13473 | { |
13474 | if (this->key_path_[depth]) | |
13475 | type = type->map_type()->key_type(); | |
13476 | else | |
13477 | type = type->map_type()->val_type(); | |
13478 | } | |
a01f2481 | 13479 | else |
13480 | { | |
13481 | // This error will be reported during lowering. | |
13482 | return TRAVERSE_CONTINUE; | |
13483 | } | |
13484 | } | |
13485 | ||
dbffccfc | 13486 | while (true) |
13487 | { | |
13488 | if (type->classification() == Type::TYPE_NAMED) | |
13489 | type = type->named_type()->real_type(); | |
13490 | else if (type->classification() == Type::TYPE_FORWARD) | |
13491 | { | |
13492 | Type* t = type->forwarded(); | |
13493 | if (t == type) | |
13494 | break; | |
13495 | type = t; | |
13496 | } | |
13497 | else | |
13498 | break; | |
13499 | } | |
13500 | ||
13501 | if (type->classification() == Type::TYPE_STRUCT) | |
13502 | { | |
13503 | Expression_list::iterator p = this->vals_->begin(); | |
13504 | while (p != this->vals_->end()) | |
13505 | { | |
13506 | // Skip key. | |
13507 | ++p; | |
13508 | go_assert(p != this->vals_->end()); | |
13509 | if (Expression::traverse(&*p, traverse) == TRAVERSE_EXIT) | |
13510 | return TRAVERSE_EXIT; | |
13511 | ++p; | |
13512 | } | |
13513 | return TRAVERSE_CONTINUE; | |
13514 | } | |
13515 | } | |
13516 | ||
13517 | if (this->vals_ != NULL) | |
13518 | return this->vals_->traverse(traverse); | |
13519 | ||
13520 | return TRAVERSE_CONTINUE; | |
e440a328 | 13521 | } |
13522 | ||
13523 | // Lower a generic composite literal into a specific version based on | |
13524 | // the type. | |
13525 | ||
13526 | Expression* | |
ceeb4318 | 13527 | Composite_literal_expression::do_lower(Gogo* gogo, Named_object* function, |
13528 | Statement_inserter* inserter, int) | |
e440a328 | 13529 | { |
13530 | Type* type = this->type_; | |
13531 | ||
7795ac51 | 13532 | for (int depth = 0; depth < this->depth_; ++depth) |
e440a328 | 13533 | { |
13534 | if (type->array_type() != NULL) | |
13535 | type = type->array_type()->element_type(); | |
13536 | else if (type->map_type() != NULL) | |
7795ac51 | 13537 | { |
13538 | if (this->key_path_[depth]) | |
13539 | type = type->map_type()->key_type(); | |
13540 | else | |
13541 | type = type->map_type()->val_type(); | |
13542 | } | |
e440a328 | 13543 | else |
13544 | { | |
5c13bd80 | 13545 | if (!type->is_error()) |
631d5788 | 13546 | go_error_at(this->location(), |
13547 | ("may only omit types within composite literals " | |
13548 | "of slice, array, or map type")); | |
e440a328 | 13549 | return Expression::make_error(this->location()); |
13550 | } | |
13551 | } | |
13552 | ||
e00772b3 | 13553 | Type *pt = type->points_to(); |
13554 | bool is_pointer = false; | |
13555 | if (pt != NULL) | |
13556 | { | |
13557 | is_pointer = true; | |
13558 | type = pt; | |
13559 | } | |
13560 | ||
13561 | Expression* ret; | |
5c13bd80 | 13562 | if (type->is_error()) |
e440a328 | 13563 | return Expression::make_error(this->location()); |
13564 | else if (type->struct_type() != NULL) | |
e00772b3 | 13565 | ret = this->lower_struct(gogo, type); |
e440a328 | 13566 | else if (type->array_type() != NULL) |
113ef6a5 | 13567 | ret = this->lower_array(type); |
e440a328 | 13568 | else if (type->map_type() != NULL) |
e00772b3 | 13569 | ret = this->lower_map(gogo, function, inserter, type); |
e440a328 | 13570 | else |
13571 | { | |
631d5788 | 13572 | go_error_at(this->location(), |
13573 | ("expected struct, slice, array, or map type " | |
13574 | "for composite literal")); | |
e440a328 | 13575 | return Expression::make_error(this->location()); |
13576 | } | |
e00772b3 | 13577 | |
13578 | if (is_pointer) | |
2c809f8f | 13579 | ret = Expression::make_heap_expression(ret, this->location()); |
e00772b3 | 13580 | |
13581 | return ret; | |
e440a328 | 13582 | } |
13583 | ||
13584 | // Lower a struct composite literal. | |
13585 | ||
13586 | Expression* | |
81c4b26b | 13587 | Composite_literal_expression::lower_struct(Gogo* gogo, Type* type) |
e440a328 | 13588 | { |
b13c66cd | 13589 | Location location = this->location(); |
e440a328 | 13590 | Struct_type* st = type->struct_type(); |
13591 | if (this->vals_ == NULL || !this->has_keys_) | |
07daa4e7 | 13592 | { |
e6013c28 | 13593 | if (this->vals_ != NULL |
13594 | && !this->vals_->empty() | |
13595 | && type->named_type() != NULL | |
13596 | && type->named_type()->named_object()->package() != NULL) | |
13597 | { | |
13598 | for (Struct_field_list::const_iterator pf = st->fields()->begin(); | |
13599 | pf != st->fields()->end(); | |
13600 | ++pf) | |
07daa4e7 | 13601 | { |
07ba7f26 | 13602 | if (Gogo::is_hidden_name(pf->field_name()) |
13603 | || pf->is_embedded_builtin(gogo)) | |
631d5788 | 13604 | go_error_at(this->location(), |
13605 | "assignment of unexported field %qs in %qs literal", | |
13606 | Gogo::message_name(pf->field_name()).c_str(), | |
13607 | type->named_type()->message_name().c_str()); | |
07daa4e7 | 13608 | } |
13609 | } | |
13610 | ||
13611 | return new Struct_construction_expression(type, this->vals_, location); | |
13612 | } | |
e440a328 | 13613 | |
13614 | size_t field_count = st->field_count(); | |
13615 | std::vector<Expression*> vals(field_count); | |
e32de7ba | 13616 | std::vector<unsigned long>* traverse_order = new(std::vector<unsigned long>); |
e440a328 | 13617 | Expression_list::const_iterator p = this->vals_->begin(); |
62750cd5 | 13618 | Expression* external_expr = NULL; |
13619 | const Named_object* external_no = NULL; | |
e440a328 | 13620 | while (p != this->vals_->end()) |
13621 | { | |
13622 | Expression* name_expr = *p; | |
13623 | ||
13624 | ++p; | |
c484d925 | 13625 | go_assert(p != this->vals_->end()); |
e440a328 | 13626 | Expression* val = *p; |
13627 | ||
13628 | ++p; | |
13629 | ||
13630 | if (name_expr == NULL) | |
13631 | { | |
631d5788 | 13632 | go_error_at(val->location(), |
13633 | "mixture of field and value initializers"); | |
e440a328 | 13634 | return Expression::make_error(location); |
13635 | } | |
13636 | ||
13637 | bool bad_key = false; | |
13638 | std::string name; | |
81c4b26b | 13639 | const Named_object* no = NULL; |
e440a328 | 13640 | switch (name_expr->classification()) |
13641 | { | |
13642 | case EXPRESSION_UNKNOWN_REFERENCE: | |
13643 | name = name_expr->unknown_expression()->name(); | |
7f7ce694 | 13644 | if (type->named_type() != NULL) |
13645 | { | |
13646 | // If the named object found for this field name comes from a | |
13647 | // different package than the struct it is a part of, do not count | |
13648 | // this incorrect lookup as a usage of the object's package. | |
13649 | no = name_expr->unknown_expression()->named_object(); | |
13650 | if (no->package() != NULL | |
13651 | && no->package() != type->named_type()->named_object()->package()) | |
13652 | no->package()->forget_usage(name_expr); | |
13653 | } | |
e440a328 | 13654 | break; |
13655 | ||
13656 | case EXPRESSION_CONST_REFERENCE: | |
81c4b26b | 13657 | no = static_cast<Const_expression*>(name_expr)->named_object(); |
e440a328 | 13658 | break; |
13659 | ||
13660 | case EXPRESSION_TYPE: | |
13661 | { | |
13662 | Type* t = name_expr->type(); | |
13663 | Named_type* nt = t->named_type(); | |
13664 | if (nt == NULL) | |
13665 | bad_key = true; | |
13666 | else | |
81c4b26b | 13667 | no = nt->named_object(); |
e440a328 | 13668 | } |
13669 | break; | |
13670 | ||
13671 | case EXPRESSION_VAR_REFERENCE: | |
81c4b26b | 13672 | no = name_expr->var_expression()->named_object(); |
e440a328 | 13673 | break; |
13674 | ||
b0c09712 | 13675 | case EXPRESSION_ENCLOSED_VAR_REFERENCE: |
13676 | no = name_expr->enclosed_var_expression()->variable(); | |
e440a328 | 13677 | break; |
13678 | ||
b0c09712 | 13679 | case EXPRESSION_FUNC_REFERENCE: |
13680 | no = name_expr->func_expression()->named_object(); | |
e440a328 | 13681 | break; |
13682 | ||
13683 | default: | |
13684 | bad_key = true; | |
13685 | break; | |
13686 | } | |
13687 | if (bad_key) | |
13688 | { | |
631d5788 | 13689 | go_error_at(name_expr->location(), "expected struct field name"); |
e440a328 | 13690 | return Expression::make_error(location); |
13691 | } | |
13692 | ||
81c4b26b | 13693 | if (no != NULL) |
13694 | { | |
62750cd5 | 13695 | if (no->package() != NULL && external_expr == NULL) |
13696 | { | |
13697 | external_expr = name_expr; | |
13698 | external_no = no; | |
13699 | } | |
13700 | ||
81c4b26b | 13701 | name = no->name(); |
13702 | ||
13703 | // A predefined name won't be packed. If it starts with a | |
13704 | // lower case letter we need to check for that case, because | |
2d29d278 | 13705 | // the field name will be packed. FIXME. |
81c4b26b | 13706 | if (!Gogo::is_hidden_name(name) |
13707 | && name[0] >= 'a' | |
13708 | && name[0] <= 'z') | |
13709 | { | |
13710 | Named_object* gno = gogo->lookup_global(name.c_str()); | |
13711 | if (gno == no) | |
13712 | name = gogo->pack_hidden_name(name, false); | |
13713 | } | |
13714 | } | |
13715 | ||
e440a328 | 13716 | unsigned int index; |
13717 | const Struct_field* sf = st->find_local_field(name, &index); | |
13718 | if (sf == NULL) | |
13719 | { | |
631d5788 | 13720 | go_error_at(name_expr->location(), "unknown field %qs in %qs", |
13721 | Gogo::message_name(name).c_str(), | |
13722 | (type->named_type() != NULL | |
13723 | ? type->named_type()->message_name().c_str() | |
13724 | : "unnamed struct")); | |
e440a328 | 13725 | return Expression::make_error(location); |
13726 | } | |
13727 | if (vals[index] != NULL) | |
13728 | { | |
631d5788 | 13729 | go_error_at(name_expr->location(), |
13730 | "duplicate value for field %qs in %qs", | |
13731 | Gogo::message_name(name).c_str(), | |
13732 | (type->named_type() != NULL | |
13733 | ? type->named_type()->message_name().c_str() | |
13734 | : "unnamed struct")); | |
e440a328 | 13735 | return Expression::make_error(location); |
13736 | } | |
13737 | ||
07daa4e7 | 13738 | if (type->named_type() != NULL |
13739 | && type->named_type()->named_object()->package() != NULL | |
07ba7f26 | 13740 | && (Gogo::is_hidden_name(sf->field_name()) |
13741 | || sf->is_embedded_builtin(gogo))) | |
631d5788 | 13742 | go_error_at(name_expr->location(), |
13743 | "assignment of unexported field %qs in %qs literal", | |
13744 | Gogo::message_name(sf->field_name()).c_str(), | |
13745 | type->named_type()->message_name().c_str()); | |
07daa4e7 | 13746 | |
e440a328 | 13747 | vals[index] = val; |
e32de7ba | 13748 | traverse_order->push_back(static_cast<unsigned long>(index)); |
e440a328 | 13749 | } |
13750 | ||
62750cd5 | 13751 | if (!this->all_are_names_) |
13752 | { | |
13753 | // This is a weird case like bug462 in the testsuite. | |
13754 | if (external_expr == NULL) | |
631d5788 | 13755 | go_error_at(this->location(), "unknown field in %qs literal", |
13756 | (type->named_type() != NULL | |
13757 | ? type->named_type()->message_name().c_str() | |
13758 | : "unnamed struct")); | |
62750cd5 | 13759 | else |
631d5788 | 13760 | go_error_at(external_expr->location(), "unknown field %qs in %qs", |
13761 | external_no->message_name().c_str(), | |
13762 | (type->named_type() != NULL | |
13763 | ? type->named_type()->message_name().c_str() | |
13764 | : "unnamed struct")); | |
62750cd5 | 13765 | return Expression::make_error(location); |
13766 | } | |
13767 | ||
e440a328 | 13768 | Expression_list* list = new Expression_list; |
13769 | list->reserve(field_count); | |
13770 | for (size_t i = 0; i < field_count; ++i) | |
13771 | list->push_back(vals[i]); | |
13772 | ||
0c4f5a19 | 13773 | Struct_construction_expression* ret = |
13774 | new Struct_construction_expression(type, list, location); | |
13775 | ret->set_traverse_order(traverse_order); | |
13776 | return ret; | |
e440a328 | 13777 | } |
13778 | ||
e32de7ba | 13779 | // Index/value/traversal-order triple. |
00773463 | 13780 | |
e32de7ba | 13781 | struct IVT_triple { |
13782 | unsigned long index; | |
13783 | unsigned long traversal_order; | |
13784 | Expression* expr; | |
13785 | IVT_triple(unsigned long i, unsigned long to, Expression *e) | |
13786 | : index(i), traversal_order(to), expr(e) { } | |
13787 | bool operator<(const IVT_triple& other) const | |
13788 | { return this->index < other.index; } | |
00773463 | 13789 | }; |
13790 | ||
e440a328 | 13791 | // Lower an array composite literal. |
13792 | ||
13793 | Expression* | |
113ef6a5 | 13794 | Composite_literal_expression::lower_array(Type* type) |
e440a328 | 13795 | { |
b13c66cd | 13796 | Location location = this->location(); |
e440a328 | 13797 | if (this->vals_ == NULL || !this->has_keys_) |
ffe743ca | 13798 | return this->make_array(type, NULL, this->vals_); |
e440a328 | 13799 | |
ffe743ca | 13800 | std::vector<unsigned long>* indexes = new std::vector<unsigned long>; |
13801 | indexes->reserve(this->vals_->size()); | |
00773463 | 13802 | bool indexes_out_of_order = false; |
ffe743ca | 13803 | Expression_list* vals = new Expression_list(); |
13804 | vals->reserve(this->vals_->size()); | |
e440a328 | 13805 | unsigned long index = 0; |
13806 | Expression_list::const_iterator p = this->vals_->begin(); | |
13807 | while (p != this->vals_->end()) | |
13808 | { | |
13809 | Expression* index_expr = *p; | |
13810 | ||
13811 | ++p; | |
c484d925 | 13812 | go_assert(p != this->vals_->end()); |
e440a328 | 13813 | Expression* val = *p; |
13814 | ||
13815 | ++p; | |
13816 | ||
ffe743ca | 13817 | if (index_expr == NULL) |
13818 | { | |
13819 | if (!indexes->empty()) | |
13820 | indexes->push_back(index); | |
13821 | } | |
13822 | else | |
e440a328 | 13823 | { |
ffe743ca | 13824 | if (indexes->empty() && !vals->empty()) |
13825 | { | |
13826 | for (size_t i = 0; i < vals->size(); ++i) | |
13827 | indexes->push_back(i); | |
13828 | } | |
13829 | ||
0c77715b | 13830 | Numeric_constant nc; |
13831 | if (!index_expr->numeric_constant_value(&nc)) | |
e440a328 | 13832 | { |
631d5788 | 13833 | go_error_at(index_expr->location(), |
13834 | "index expression is not integer constant"); | |
e440a328 | 13835 | return Expression::make_error(location); |
13836 | } | |
6f6d9955 | 13837 | |
0c77715b | 13838 | switch (nc.to_unsigned_long(&index)) |
e440a328 | 13839 | { |
0c77715b | 13840 | case Numeric_constant::NC_UL_VALID: |
13841 | break; | |
13842 | case Numeric_constant::NC_UL_NOTINT: | |
631d5788 | 13843 | go_error_at(index_expr->location(), |
13844 | "index expression is not integer constant"); | |
0c77715b | 13845 | return Expression::make_error(location); |
13846 | case Numeric_constant::NC_UL_NEGATIVE: | |
631d5788 | 13847 | go_error_at(index_expr->location(), |
13848 | "index expression is negative"); | |
e440a328 | 13849 | return Expression::make_error(location); |
0c77715b | 13850 | case Numeric_constant::NC_UL_BIG: |
631d5788 | 13851 | go_error_at(index_expr->location(), "index value overflow"); |
e440a328 | 13852 | return Expression::make_error(location); |
0c77715b | 13853 | default: |
13854 | go_unreachable(); | |
e440a328 | 13855 | } |
6f6d9955 | 13856 | |
13857 | Named_type* ntype = Type::lookup_integer_type("int"); | |
13858 | Integer_type* inttype = ntype->integer_type(); | |
0c77715b | 13859 | if (sizeof(index) <= static_cast<size_t>(inttype->bits() * 8) |
13860 | && index >> (inttype->bits() - 1) != 0) | |
6f6d9955 | 13861 | { |
631d5788 | 13862 | go_error_at(index_expr->location(), "index value overflow"); |
6f6d9955 | 13863 | return Expression::make_error(location); |
13864 | } | |
13865 | ||
ffe743ca | 13866 | if (std::find(indexes->begin(), indexes->end(), index) |
13867 | != indexes->end()) | |
e440a328 | 13868 | { |
631d5788 | 13869 | go_error_at(index_expr->location(), |
13870 | "duplicate value for index %lu", | |
13871 | index); | |
e440a328 | 13872 | return Expression::make_error(location); |
13873 | } | |
ffe743ca | 13874 | |
00773463 | 13875 | if (!indexes->empty() && index < indexes->back()) |
13876 | indexes_out_of_order = true; | |
13877 | ||
ffe743ca | 13878 | indexes->push_back(index); |
e440a328 | 13879 | } |
13880 | ||
ffe743ca | 13881 | vals->push_back(val); |
13882 | ||
e440a328 | 13883 | ++index; |
13884 | } | |
13885 | ||
ffe743ca | 13886 | if (indexes->empty()) |
13887 | { | |
13888 | delete indexes; | |
13889 | indexes = NULL; | |
13890 | } | |
e440a328 | 13891 | |
e32de7ba | 13892 | std::vector<unsigned long>* traverse_order = NULL; |
00773463 | 13893 | if (indexes_out_of_order) |
13894 | { | |
e32de7ba | 13895 | typedef std::vector<IVT_triple> V; |
00773463 | 13896 | |
13897 | V v; | |
13898 | v.reserve(indexes->size()); | |
13899 | std::vector<unsigned long>::const_iterator pi = indexes->begin(); | |
e32de7ba | 13900 | unsigned long torder = 0; |
00773463 | 13901 | for (Expression_list::const_iterator pe = vals->begin(); |
13902 | pe != vals->end(); | |
e32de7ba | 13903 | ++pe, ++pi, ++torder) |
13904 | v.push_back(IVT_triple(*pi, torder, *pe)); | |
00773463 | 13905 | |
e32de7ba | 13906 | std::sort(v.begin(), v.end()); |
00773463 | 13907 | |
13908 | delete indexes; | |
13909 | delete vals; | |
e32de7ba | 13910 | |
00773463 | 13911 | indexes = new std::vector<unsigned long>(); |
13912 | indexes->reserve(v.size()); | |
13913 | vals = new Expression_list(); | |
13914 | vals->reserve(v.size()); | |
e32de7ba | 13915 | traverse_order = new std::vector<unsigned long>(); |
13916 | traverse_order->reserve(v.size()); | |
00773463 | 13917 | |
13918 | for (V::const_iterator p = v.begin(); p != v.end(); ++p) | |
13919 | { | |
e32de7ba | 13920 | indexes->push_back(p->index); |
13921 | vals->push_back(p->expr); | |
13922 | traverse_order->push_back(p->traversal_order); | |
00773463 | 13923 | } |
13924 | } | |
13925 | ||
e32de7ba | 13926 | Expression* ret = this->make_array(type, indexes, vals); |
13927 | Array_construction_expression* ace = ret->array_literal(); | |
13928 | if (ace != NULL && traverse_order != NULL) | |
13929 | ace->set_traverse_order(traverse_order); | |
13930 | return ret; | |
e440a328 | 13931 | } |
13932 | ||
13933 | // Actually build the array composite literal. This handles | |
13934 | // [...]{...}. | |
13935 | ||
13936 | Expression* | |
ffe743ca | 13937 | Composite_literal_expression::make_array( |
13938 | Type* type, | |
13939 | const std::vector<unsigned long>* indexes, | |
13940 | Expression_list* vals) | |
e440a328 | 13941 | { |
b13c66cd | 13942 | Location location = this->location(); |
e440a328 | 13943 | Array_type* at = type->array_type(); |
ffe743ca | 13944 | |
e440a328 | 13945 | if (at->length() != NULL && at->length()->is_nil_expression()) |
13946 | { | |
ffe743ca | 13947 | size_t size; |
13948 | if (vals == NULL) | |
13949 | size = 0; | |
00773463 | 13950 | else if (indexes != NULL) |
13951 | size = indexes->back() + 1; | |
13952 | else | |
ffe743ca | 13953 | { |
13954 | size = vals->size(); | |
13955 | Integer_type* it = Type::lookup_integer_type("int")->integer_type(); | |
13956 | if (sizeof(size) <= static_cast<size_t>(it->bits() * 8) | |
13957 | && size >> (it->bits() - 1) != 0) | |
13958 | { | |
631d5788 | 13959 | go_error_at(location, "too many elements in composite literal"); |
ffe743ca | 13960 | return Expression::make_error(location); |
13961 | } | |
13962 | } | |
ffe743ca | 13963 | |
e67508fa | 13964 | Expression* elen = Expression::make_integer_ul(size, NULL, location); |
e440a328 | 13965 | at = Type::make_array_type(at->element_type(), elen); |
13966 | type = at; | |
13967 | } | |
ffe743ca | 13968 | else if (at->length() != NULL |
13969 | && !at->length()->is_error_expression() | |
13970 | && this->vals_ != NULL) | |
13971 | { | |
13972 | Numeric_constant nc; | |
13973 | unsigned long val; | |
13974 | if (at->length()->numeric_constant_value(&nc) | |
13975 | && nc.to_unsigned_long(&val) == Numeric_constant::NC_UL_VALID) | |
13976 | { | |
13977 | if (indexes == NULL) | |
13978 | { | |
13979 | if (this->vals_->size() > val) | |
13980 | { | |
631d5788 | 13981 | go_error_at(location, |
13982 | "too many elements in composite literal"); | |
ffe743ca | 13983 | return Expression::make_error(location); |
13984 | } | |
13985 | } | |
13986 | else | |
13987 | { | |
00773463 | 13988 | unsigned long max = indexes->back(); |
ffe743ca | 13989 | if (max >= val) |
13990 | { | |
631d5788 | 13991 | go_error_at(location, |
13992 | ("some element keys in composite literal " | |
13993 | "are out of range")); | |
ffe743ca | 13994 | return Expression::make_error(location); |
13995 | } | |
13996 | } | |
13997 | } | |
13998 | } | |
13999 | ||
e440a328 | 14000 | if (at->length() != NULL) |
ffe743ca | 14001 | return new Fixed_array_construction_expression(type, indexes, vals, |
14002 | location); | |
e440a328 | 14003 | else |
2c809f8f | 14004 | return new Slice_construction_expression(type, indexes, vals, location); |
e440a328 | 14005 | } |
14006 | ||
14007 | // Lower a map composite literal. | |
14008 | ||
14009 | Expression* | |
a287720d | 14010 | Composite_literal_expression::lower_map(Gogo* gogo, Named_object* function, |
ceeb4318 | 14011 | Statement_inserter* inserter, |
a287720d | 14012 | Type* type) |
e440a328 | 14013 | { |
b13c66cd | 14014 | Location location = this->location(); |
e440a328 | 14015 | if (this->vals_ != NULL) |
14016 | { | |
14017 | if (!this->has_keys_) | |
14018 | { | |
631d5788 | 14019 | go_error_at(location, "map composite literal must have keys"); |
e440a328 | 14020 | return Expression::make_error(location); |
14021 | } | |
14022 | ||
a287720d | 14023 | for (Expression_list::iterator p = this->vals_->begin(); |
e440a328 | 14024 | p != this->vals_->end(); |
14025 | p += 2) | |
14026 | { | |
14027 | if (*p == NULL) | |
14028 | { | |
14029 | ++p; | |
631d5788 | 14030 | go_error_at((*p)->location(), |
14031 | ("map composite literal must " | |
14032 | "have keys for every value")); | |
e440a328 | 14033 | return Expression::make_error(location); |
14034 | } | |
a287720d | 14035 | // Make sure we have lowered the key; it may not have been |
14036 | // lowered in order to handle keys for struct composite | |
14037 | // literals. Lower it now to get the right error message. | |
14038 | if ((*p)->unknown_expression() != NULL) | |
14039 | { | |
14040 | (*p)->unknown_expression()->clear_is_composite_literal_key(); | |
ceeb4318 | 14041 | gogo->lower_expression(function, inserter, &*p); |
c484d925 | 14042 | go_assert((*p)->is_error_expression()); |
a287720d | 14043 | return Expression::make_error(location); |
14044 | } | |
e440a328 | 14045 | } |
14046 | } | |
14047 | ||
14048 | return new Map_construction_expression(type, this->vals_, location); | |
14049 | } | |
14050 | ||
d751bb78 | 14051 | // Dump ast representation for a composite literal expression. |
14052 | ||
14053 | void | |
14054 | Composite_literal_expression::do_dump_expression( | |
14055 | Ast_dump_context* ast_dump_context) const | |
14056 | { | |
8b1c301d | 14057 | ast_dump_context->ostream() << "composite("; |
d751bb78 | 14058 | ast_dump_context->dump_type(this->type_); |
14059 | ast_dump_context->ostream() << ", {"; | |
8b1c301d | 14060 | ast_dump_context->dump_expression_list(this->vals_, this->has_keys_); |
d751bb78 | 14061 | ast_dump_context->ostream() << "})"; |
14062 | } | |
14063 | ||
e440a328 | 14064 | // Make a composite literal expression. |
14065 | ||
14066 | Expression* | |
14067 | Expression::make_composite_literal(Type* type, int depth, bool has_keys, | |
62750cd5 | 14068 | Expression_list* vals, bool all_are_names, |
b13c66cd | 14069 | Location location) |
e440a328 | 14070 | { |
14071 | return new Composite_literal_expression(type, depth, has_keys, vals, | |
62750cd5 | 14072 | all_are_names, location); |
e440a328 | 14073 | } |
14074 | ||
14075 | // Return whether this expression is a composite literal. | |
14076 | ||
14077 | bool | |
14078 | Expression::is_composite_literal() const | |
14079 | { | |
14080 | switch (this->classification_) | |
14081 | { | |
14082 | case EXPRESSION_COMPOSITE_LITERAL: | |
14083 | case EXPRESSION_STRUCT_CONSTRUCTION: | |
14084 | case EXPRESSION_FIXED_ARRAY_CONSTRUCTION: | |
2c809f8f | 14085 | case EXPRESSION_SLICE_CONSTRUCTION: |
e440a328 | 14086 | case EXPRESSION_MAP_CONSTRUCTION: |
14087 | return true; | |
14088 | default: | |
14089 | return false; | |
14090 | } | |
14091 | } | |
14092 | ||
14093 | // Return whether this expression is a composite literal which is not | |
14094 | // constant. | |
14095 | ||
14096 | bool | |
14097 | Expression::is_nonconstant_composite_literal() const | |
14098 | { | |
14099 | switch (this->classification_) | |
14100 | { | |
14101 | case EXPRESSION_STRUCT_CONSTRUCTION: | |
14102 | { | |
14103 | const Struct_construction_expression *psce = | |
14104 | static_cast<const Struct_construction_expression*>(this); | |
14105 | return !psce->is_constant_struct(); | |
14106 | } | |
14107 | case EXPRESSION_FIXED_ARRAY_CONSTRUCTION: | |
14108 | { | |
14109 | const Fixed_array_construction_expression *pace = | |
14110 | static_cast<const Fixed_array_construction_expression*>(this); | |
14111 | return !pace->is_constant_array(); | |
14112 | } | |
2c809f8f | 14113 | case EXPRESSION_SLICE_CONSTRUCTION: |
e440a328 | 14114 | { |
2c809f8f | 14115 | const Slice_construction_expression *pace = |
14116 | static_cast<const Slice_construction_expression*>(this); | |
e440a328 | 14117 | return !pace->is_constant_array(); |
14118 | } | |
14119 | case EXPRESSION_MAP_CONSTRUCTION: | |
14120 | return true; | |
14121 | default: | |
14122 | return false; | |
14123 | } | |
14124 | } | |
14125 | ||
35a54f17 | 14126 | // Return true if this is a variable or temporary_variable. |
14127 | ||
14128 | bool | |
14129 | Expression::is_variable() const | |
14130 | { | |
14131 | switch (this->classification_) | |
14132 | { | |
14133 | case EXPRESSION_VAR_REFERENCE: | |
14134 | case EXPRESSION_TEMPORARY_REFERENCE: | |
14135 | case EXPRESSION_SET_AND_USE_TEMPORARY: | |
b0c09712 | 14136 | case EXPRESSION_ENCLOSED_VAR_REFERENCE: |
35a54f17 | 14137 | return true; |
14138 | default: | |
14139 | return false; | |
14140 | } | |
14141 | } | |
14142 | ||
e440a328 | 14143 | // Return true if this is a reference to a local variable. |
14144 | ||
14145 | bool | |
14146 | Expression::is_local_variable() const | |
14147 | { | |
14148 | const Var_expression* ve = this->var_expression(); | |
14149 | if (ve == NULL) | |
14150 | return false; | |
14151 | const Named_object* no = ve->named_object(); | |
14152 | return (no->is_result_variable() | |
14153 | || (no->is_variable() && !no->var_value()->is_global())); | |
14154 | } | |
14155 | ||
14156 | // Class Type_guard_expression. | |
14157 | ||
14158 | // Traversal. | |
14159 | ||
14160 | int | |
14161 | Type_guard_expression::do_traverse(Traverse* traverse) | |
14162 | { | |
14163 | if (Expression::traverse(&this->expr_, traverse) == TRAVERSE_EXIT | |
14164 | || Type::traverse(this->type_, traverse) == TRAVERSE_EXIT) | |
14165 | return TRAVERSE_EXIT; | |
14166 | return TRAVERSE_CONTINUE; | |
14167 | } | |
14168 | ||
2c809f8f | 14169 | Expression* |
14170 | Type_guard_expression::do_flatten(Gogo*, Named_object*, | |
14171 | Statement_inserter* inserter) | |
14172 | { | |
5bf8be8b | 14173 | if (this->expr_->is_error_expression() |
14174 | || this->expr_->type()->is_error_type()) | |
14175 | { | |
14176 | go_assert(saw_errors()); | |
14177 | return Expression::make_error(this->location()); | |
14178 | } | |
14179 | ||
2c809f8f | 14180 | if (!this->expr_->is_variable()) |
14181 | { | |
14182 | Temporary_statement* temp = Statement::make_temporary(NULL, this->expr_, | |
14183 | this->location()); | |
14184 | inserter->insert(temp); | |
14185 | this->expr_ = | |
14186 | Expression::make_temporary_reference(temp, this->location()); | |
14187 | } | |
14188 | return this; | |
14189 | } | |
14190 | ||
e440a328 | 14191 | // Check types of a type guard expression. The expression must have |
14192 | // an interface type, but the actual type conversion is checked at run | |
14193 | // time. | |
14194 | ||
14195 | void | |
14196 | Type_guard_expression::do_check_types(Gogo*) | |
14197 | { | |
e440a328 | 14198 | Type* expr_type = this->expr_->type(); |
7e9da23f | 14199 | if (expr_type->interface_type() == NULL) |
f725ade8 | 14200 | { |
5c13bd80 | 14201 | if (!expr_type->is_error() && !this->type_->is_error()) |
f725ade8 | 14202 | this->report_error(_("type assertion only valid for interface types")); |
14203 | this->set_is_error(); | |
14204 | } | |
e440a328 | 14205 | else if (this->type_->interface_type() == NULL) |
14206 | { | |
14207 | std::string reason; | |
14208 | if (!expr_type->interface_type()->implements_interface(this->type_, | |
14209 | &reason)) | |
14210 | { | |
5c13bd80 | 14211 | if (!this->type_->is_error()) |
e440a328 | 14212 | { |
f725ade8 | 14213 | if (reason.empty()) |
14214 | this->report_error(_("impossible type assertion: " | |
14215 | "type does not implement interface")); | |
14216 | else | |
631d5788 | 14217 | go_error_at(this->location(), |
14218 | ("impossible type assertion: " | |
14219 | "type does not implement interface (%s)"), | |
14220 | reason.c_str()); | |
e440a328 | 14221 | } |
f725ade8 | 14222 | this->set_is_error(); |
e440a328 | 14223 | } |
14224 | } | |
14225 | } | |
14226 | ||
ea664253 | 14227 | // Return the backend representation for a type guard expression. |
e440a328 | 14228 | |
ea664253 | 14229 | Bexpression* |
14230 | Type_guard_expression::do_get_backend(Translate_context* context) | |
e440a328 | 14231 | { |
2c809f8f | 14232 | Expression* conversion; |
7e9da23f | 14233 | if (this->type_->interface_type() != NULL) |
2c809f8f | 14234 | conversion = |
14235 | Expression::convert_interface_to_interface(this->type_, this->expr_, | |
14236 | true, this->location()); | |
e440a328 | 14237 | else |
2c809f8f | 14238 | conversion = |
14239 | Expression::convert_for_assignment(context->gogo(), this->type_, | |
14240 | this->expr_, this->location()); | |
14241 | ||
21b70e8f | 14242 | Gogo* gogo = context->gogo(); |
14243 | Btype* bt = this->type_->get_backend(gogo); | |
14244 | Bexpression* bexpr = conversion->get_backend(context); | |
14245 | return gogo->backend()->convert_expression(bt, bexpr, this->location()); | |
e440a328 | 14246 | } |
14247 | ||
d751bb78 | 14248 | // Dump ast representation for a type guard expression. |
14249 | ||
14250 | void | |
2c809f8f | 14251 | Type_guard_expression::do_dump_expression(Ast_dump_context* ast_dump_context) |
d751bb78 | 14252 | const |
14253 | { | |
14254 | this->expr_->dump_expression(ast_dump_context); | |
14255 | ast_dump_context->ostream() << "."; | |
14256 | ast_dump_context->dump_type(this->type_); | |
14257 | } | |
14258 | ||
e440a328 | 14259 | // Make a type guard expression. |
14260 | ||
14261 | Expression* | |
14262 | Expression::make_type_guard(Expression* expr, Type* type, | |
b13c66cd | 14263 | Location location) |
e440a328 | 14264 | { |
14265 | return new Type_guard_expression(expr, type, location); | |
14266 | } | |
14267 | ||
2c809f8f | 14268 | // Class Heap_expression. |
e440a328 | 14269 | |
da244e59 | 14270 | // Return the type of the expression stored on the heap. |
e440a328 | 14271 | |
da244e59 | 14272 | Type* |
14273 | Heap_expression::do_type() | |
14274 | { return Type::make_pointer_type(this->expr_->type()); } | |
e440a328 | 14275 | |
ea664253 | 14276 | // Return the backend representation for allocating an expression on the heap. |
e440a328 | 14277 | |
ea664253 | 14278 | Bexpression* |
14279 | Heap_expression::do_get_backend(Translate_context* context) | |
e440a328 | 14280 | { |
03118c21 | 14281 | Type* etype = this->expr_->type(); |
14282 | if (this->expr_->is_error_expression() || etype->is_error()) | |
ea664253 | 14283 | return context->backend()->error_expression(); |
2c809f8f | 14284 | |
02c19a1a | 14285 | Location loc = this->location(); |
2c809f8f | 14286 | Gogo* gogo = context->gogo(); |
02c19a1a | 14287 | Btype* btype = this->type()->get_backend(gogo); |
45ff893b | 14288 | |
03118c21 | 14289 | Expression* alloc = Expression::make_allocation(etype, loc); |
45ff893b | 14290 | Node* n = Node::make_node(this); |
14291 | if ((n->encoding() & ESCAPE_MASK) == int(Node::ESCAPE_NONE)) | |
14292 | alloc->allocation_expression()->set_allocate_on_stack(); | |
14293 | Bexpression* space = alloc->get_backend(context); | |
02c19a1a | 14294 | |
14295 | Bstatement* decl; | |
14296 | Named_object* fn = context->function(); | |
14297 | go_assert(fn != NULL); | |
14298 | Bfunction* fndecl = fn->func_value()->get_or_make_decl(gogo, fn); | |
14299 | Bvariable* space_temp = | |
14300 | gogo->backend()->temporary_variable(fndecl, context->bblock(), btype, | |
14301 | space, true, loc, &decl); | |
03118c21 | 14302 | Btype* expr_btype = etype->get_backend(gogo); |
02c19a1a | 14303 | |
ea664253 | 14304 | Bexpression* bexpr = this->expr_->get_backend(context); |
03118c21 | 14305 | |
14306 | // If this assignment needs a write barrier, call typedmemmove. We | |
14307 | // don't do this in the write barrier pass because in some cases | |
14308 | // backend conversion can introduce new Heap_expression values. | |
14309 | Bstatement* assn; | |
14310 | if (!etype->has_pointer()) | |
14311 | { | |
14312 | space = gogo->backend()->var_expression(space_temp, VE_lvalue, loc); | |
14313 | Bexpression* ref = | |
14314 | gogo->backend()->indirect_expression(expr_btype, space, true, loc); | |
14315 | assn = gogo->backend()->assignment_statement(fndecl, ref, bexpr, loc); | |
14316 | } | |
14317 | else | |
14318 | { | |
14319 | Bstatement* edecl; | |
14320 | Bvariable* btemp = | |
14321 | gogo->backend()->temporary_variable(fndecl, context->bblock(), | |
14322 | expr_btype, bexpr, true, loc, | |
14323 | &edecl); | |
14324 | Bexpression* btempref = gogo->backend()->var_expression(btemp, | |
14325 | VE_lvalue, loc); | |
14326 | Bexpression* addr = gogo->backend()->address_expression(btempref, loc); | |
14327 | ||
14328 | Expression* td = Expression::make_type_descriptor(etype, loc); | |
14329 | Type* etype_ptr = Type::make_pointer_type(etype); | |
14330 | space = gogo->backend()->var_expression(space_temp, VE_rvalue, loc); | |
14331 | Expression* elhs = Expression::make_backend(space, etype_ptr, loc); | |
14332 | Expression* erhs = Expression::make_backend(addr, etype_ptr, loc); | |
14333 | Expression* call = Runtime::make_call(Runtime::TYPEDMEMMOVE, loc, 3, | |
14334 | td, elhs, erhs); | |
14335 | Bexpression* bcall = call->get_backend(context); | |
14336 | Bstatement* s = gogo->backend()->expression_statement(fndecl, bcall); | |
14337 | assn = gogo->backend()->compound_statement(edecl, s); | |
14338 | } | |
02c19a1a | 14339 | decl = gogo->backend()->compound_statement(decl, assn); |
d4e6573e | 14340 | space = gogo->backend()->var_expression(space_temp, VE_rvalue, loc); |
ea664253 | 14341 | return gogo->backend()->compound_expression(decl, space, loc); |
e440a328 | 14342 | } |
14343 | ||
2c809f8f | 14344 | // Dump ast representation for a heap expression. |
d751bb78 | 14345 | |
14346 | void | |
2c809f8f | 14347 | Heap_expression::do_dump_expression( |
d751bb78 | 14348 | Ast_dump_context* ast_dump_context) const |
14349 | { | |
14350 | ast_dump_context->ostream() << "&("; | |
14351 | ast_dump_context->dump_expression(this->expr_); | |
14352 | ast_dump_context->ostream() << ")"; | |
14353 | } | |
14354 | ||
2c809f8f | 14355 | // Allocate an expression on the heap. |
e440a328 | 14356 | |
14357 | Expression* | |
2c809f8f | 14358 | Expression::make_heap_expression(Expression* expr, Location location) |
e440a328 | 14359 | { |
2c809f8f | 14360 | return new Heap_expression(expr, location); |
e440a328 | 14361 | } |
14362 | ||
14363 | // Class Receive_expression. | |
14364 | ||
14365 | // Return the type of a receive expression. | |
14366 | ||
14367 | Type* | |
14368 | Receive_expression::do_type() | |
14369 | { | |
e429e3bd | 14370 | if (this->is_error_expression()) |
14371 | return Type::make_error_type(); | |
e440a328 | 14372 | Channel_type* channel_type = this->channel_->type()->channel_type(); |
14373 | if (channel_type == NULL) | |
e429e3bd | 14374 | { |
14375 | this->report_error(_("expected channel")); | |
14376 | return Type::make_error_type(); | |
14377 | } | |
e440a328 | 14378 | return channel_type->element_type(); |
14379 | } | |
14380 | ||
14381 | // Check types for a receive expression. | |
14382 | ||
14383 | void | |
14384 | Receive_expression::do_check_types(Gogo*) | |
14385 | { | |
14386 | Type* type = this->channel_->type(); | |
5c13bd80 | 14387 | if (type->is_error()) |
e440a328 | 14388 | { |
e429e3bd | 14389 | go_assert(saw_errors()); |
e440a328 | 14390 | this->set_is_error(); |
14391 | return; | |
14392 | } | |
14393 | if (type->channel_type() == NULL) | |
14394 | { | |
14395 | this->report_error(_("expected channel")); | |
14396 | return; | |
14397 | } | |
14398 | if (!type->channel_type()->may_receive()) | |
14399 | { | |
14400 | this->report_error(_("invalid receive on send-only channel")); | |
14401 | return; | |
14402 | } | |
14403 | } | |
14404 | ||
2c809f8f | 14405 | // Flattening for receive expressions creates a temporary variable to store |
14406 | // received data in for receives. | |
14407 | ||
14408 | Expression* | |
14409 | Receive_expression::do_flatten(Gogo*, Named_object*, | |
14410 | Statement_inserter* inserter) | |
14411 | { | |
14412 | Channel_type* channel_type = this->channel_->type()->channel_type(); | |
14413 | if (channel_type == NULL) | |
14414 | { | |
14415 | go_assert(saw_errors()); | |
14416 | return this; | |
14417 | } | |
5bf8be8b | 14418 | else if (this->channel_->is_error_expression()) |
14419 | { | |
14420 | go_assert(saw_errors()); | |
14421 | return Expression::make_error(this->location()); | |
14422 | } | |
2c809f8f | 14423 | |
14424 | Type* element_type = channel_type->element_type(); | |
14425 | if (this->temp_receiver_ == NULL) | |
14426 | { | |
14427 | this->temp_receiver_ = Statement::make_temporary(element_type, NULL, | |
14428 | this->location()); | |
14429 | this->temp_receiver_->set_is_address_taken(); | |
14430 | inserter->insert(this->temp_receiver_); | |
14431 | } | |
14432 | ||
14433 | return this; | |
14434 | } | |
14435 | ||
ea664253 | 14436 | // Get the backend representation for a receive expression. |
e440a328 | 14437 | |
ea664253 | 14438 | Bexpression* |
14439 | Receive_expression::do_get_backend(Translate_context* context) | |
e440a328 | 14440 | { |
f24f10bb | 14441 | Location loc = this->location(); |
14442 | ||
e440a328 | 14443 | Channel_type* channel_type = this->channel_->type()->channel_type(); |
5b8368f4 | 14444 | if (channel_type == NULL) |
14445 | { | |
c484d925 | 14446 | go_assert(this->channel_->type()->is_error()); |
ea664253 | 14447 | return context->backend()->error_expression(); |
5b8368f4 | 14448 | } |
e440a328 | 14449 | |
2c809f8f | 14450 | Expression* recv_ref = |
14451 | Expression::make_temporary_reference(this->temp_receiver_, loc); | |
14452 | Expression* recv_addr = | |
14453 | Expression::make_temporary_reference(this->temp_receiver_, loc); | |
14454 | recv_addr = Expression::make_unary(OPERATOR_AND, recv_addr, loc); | |
e36a5ff5 | 14455 | Expression* recv = Runtime::make_call(Runtime::CHANRECV1, loc, 2, |
14456 | this->channel_, recv_addr); | |
ea664253 | 14457 | return Expression::make_compound(recv, recv_ref, loc)->get_backend(context); |
e440a328 | 14458 | } |
14459 | ||
d751bb78 | 14460 | // Dump ast representation for a receive expression. |
14461 | ||
14462 | void | |
14463 | Receive_expression::do_dump_expression(Ast_dump_context* ast_dump_context) const | |
14464 | { | |
14465 | ast_dump_context->ostream() << " <- " ; | |
14466 | ast_dump_context->dump_expression(channel_); | |
14467 | } | |
14468 | ||
e440a328 | 14469 | // Make a receive expression. |
14470 | ||
14471 | Receive_expression* | |
b13c66cd | 14472 | Expression::make_receive(Expression* channel, Location location) |
e440a328 | 14473 | { |
14474 | return new Receive_expression(channel, location); | |
14475 | } | |
14476 | ||
e440a328 | 14477 | // An expression which evaluates to a pointer to the type descriptor |
14478 | // of a type. | |
14479 | ||
14480 | class Type_descriptor_expression : public Expression | |
14481 | { | |
14482 | public: | |
b13c66cd | 14483 | Type_descriptor_expression(Type* type, Location location) |
e440a328 | 14484 | : Expression(EXPRESSION_TYPE_DESCRIPTOR, location), |
14485 | type_(type) | |
14486 | { } | |
14487 | ||
14488 | protected: | |
4b686186 | 14489 | int |
14490 | do_traverse(Traverse*); | |
14491 | ||
e440a328 | 14492 | Type* |
14493 | do_type() | |
14494 | { return Type::make_type_descriptor_ptr_type(); } | |
14495 | ||
f9ca30f9 | 14496 | bool |
3ae06f68 | 14497 | do_is_static_initializer() const |
f9ca30f9 | 14498 | { return true; } |
14499 | ||
e440a328 | 14500 | void |
14501 | do_determine_type(const Type_context*) | |
14502 | { } | |
14503 | ||
14504 | Expression* | |
14505 | do_copy() | |
14506 | { return this; } | |
14507 | ||
ea664253 | 14508 | Bexpression* |
14509 | do_get_backend(Translate_context* context) | |
a1d23b41 | 14510 | { |
ea664253 | 14511 | return this->type_->type_descriptor_pointer(context->gogo(), |
14512 | this->location()); | |
a1d23b41 | 14513 | } |
e440a328 | 14514 | |
d751bb78 | 14515 | void |
14516 | do_dump_expression(Ast_dump_context*) const; | |
14517 | ||
e440a328 | 14518 | private: |
14519 | // The type for which this is the descriptor. | |
14520 | Type* type_; | |
14521 | }; | |
14522 | ||
4b686186 | 14523 | int |
14524 | Type_descriptor_expression::do_traverse(Traverse* traverse) | |
14525 | { | |
14526 | if (Type::traverse(this->type_, traverse) == TRAVERSE_EXIT) | |
14527 | return TRAVERSE_EXIT; | |
14528 | return TRAVERSE_CONTINUE; | |
14529 | } | |
14530 | ||
d751bb78 | 14531 | // Dump ast representation for a type descriptor expression. |
14532 | ||
14533 | void | |
14534 | Type_descriptor_expression::do_dump_expression( | |
14535 | Ast_dump_context* ast_dump_context) const | |
14536 | { | |
14537 | ast_dump_context->dump_type(this->type_); | |
14538 | } | |
14539 | ||
e440a328 | 14540 | // Make a type descriptor expression. |
14541 | ||
14542 | Expression* | |
b13c66cd | 14543 | Expression::make_type_descriptor(Type* type, Location location) |
e440a328 | 14544 | { |
14545 | return new Type_descriptor_expression(type, location); | |
14546 | } | |
14547 | ||
aa5ae575 | 14548 | // An expression which evaluates to a pointer to the Garbage Collection symbol |
14549 | // of a type. | |
14550 | ||
14551 | class GC_symbol_expression : public Expression | |
14552 | { | |
14553 | public: | |
14554 | GC_symbol_expression(Type* type) | |
14555 | : Expression(EXPRESSION_GC_SYMBOL, Linemap::predeclared_location()), | |
14556 | type_(type) | |
14557 | {} | |
14558 | ||
14559 | protected: | |
14560 | Type* | |
14561 | do_type() | |
03118c21 | 14562 | { return Type::make_pointer_type(Type::lookup_integer_type("uint8")); } |
aa5ae575 | 14563 | |
14564 | bool | |
3ae06f68 | 14565 | do_is_static_initializer() const |
aa5ae575 | 14566 | { return true; } |
14567 | ||
14568 | void | |
14569 | do_determine_type(const Type_context*) | |
14570 | { } | |
14571 | ||
14572 | Expression* | |
14573 | do_copy() | |
14574 | { return this; } | |
14575 | ||
14576 | Bexpression* | |
14577 | do_get_backend(Translate_context* context) | |
14578 | { return this->type_->gc_symbol_pointer(context->gogo()); } | |
14579 | ||
14580 | void | |
14581 | do_dump_expression(Ast_dump_context*) const; | |
14582 | ||
14583 | private: | |
14584 | // The type which this gc symbol describes. | |
14585 | Type* type_; | |
14586 | }; | |
14587 | ||
14588 | // Dump ast representation for a gc symbol expression. | |
14589 | ||
14590 | void | |
14591 | GC_symbol_expression::do_dump_expression( | |
14592 | Ast_dump_context* ast_dump_context) const | |
14593 | { | |
14594 | ast_dump_context->ostream() << "gcdata("; | |
14595 | ast_dump_context->dump_type(this->type_); | |
14596 | ast_dump_context->ostream() << ")"; | |
14597 | } | |
14598 | ||
14599 | // Make a gc symbol expression. | |
14600 | ||
14601 | Expression* | |
14602 | Expression::make_gc_symbol(Type* type) | |
14603 | { | |
14604 | return new GC_symbol_expression(type); | |
14605 | } | |
14606 | ||
03118c21 | 14607 | // An expression that evaluates to a pointer to a symbol holding the |
14608 | // ptrmask data of a type. | |
14609 | ||
14610 | class Ptrmask_symbol_expression : public Expression | |
14611 | { | |
14612 | public: | |
14613 | Ptrmask_symbol_expression(Type* type) | |
14614 | : Expression(EXPRESSION_PTRMASK_SYMBOL, Linemap::predeclared_location()), | |
14615 | type_(type) | |
14616 | {} | |
14617 | ||
14618 | protected: | |
14619 | Type* | |
14620 | do_type() | |
14621 | { return Type::make_pointer_type(Type::lookup_integer_type("uint8")); } | |
14622 | ||
14623 | bool | |
14624 | do_is_static_initializer() const | |
14625 | { return true; } | |
14626 | ||
14627 | void | |
14628 | do_determine_type(const Type_context*) | |
14629 | { } | |
14630 | ||
14631 | Expression* | |
14632 | do_copy() | |
14633 | { return this; } | |
14634 | ||
14635 | Bexpression* | |
14636 | do_get_backend(Translate_context*); | |
14637 | ||
14638 | void | |
14639 | do_dump_expression(Ast_dump_context*) const; | |
14640 | ||
14641 | private: | |
14642 | // The type that this ptrmask symbol describes. | |
14643 | Type* type_; | |
14644 | }; | |
14645 | ||
14646 | // Return the ptrmask variable. | |
14647 | ||
14648 | Bexpression* | |
14649 | Ptrmask_symbol_expression::do_get_backend(Translate_context* context) | |
14650 | { | |
14651 | Gogo* gogo = context->gogo(); | |
14652 | ||
14653 | // If this type does not need a gcprog, then we can use the standard | |
14654 | // GC symbol. | |
14655 | int64_t ptrsize, ptrdata; | |
14656 | if (!this->type_->needs_gcprog(gogo, &ptrsize, &ptrdata)) | |
14657 | return this->type_->gc_symbol_pointer(gogo); | |
14658 | ||
14659 | // Otherwise we have to build a ptrmask variable, and return a | |
14660 | // pointer to it. | |
14661 | ||
14662 | Bvariable* bvar = this->type_->gc_ptrmask_var(gogo, ptrsize, ptrdata); | |
14663 | Location bloc = Linemap::predeclared_location(); | |
14664 | Bexpression* bref = gogo->backend()->var_expression(bvar, VE_rvalue, bloc); | |
14665 | Bexpression* baddr = gogo->backend()->address_expression(bref, bloc); | |
14666 | ||
14667 | Type* uint8_type = Type::lookup_integer_type("uint8"); | |
14668 | Type* pointer_uint8_type = Type::make_pointer_type(uint8_type); | |
14669 | Btype* ubtype = pointer_uint8_type->get_backend(gogo); | |
14670 | return gogo->backend()->convert_expression(ubtype, baddr, bloc); | |
14671 | } | |
14672 | ||
14673 | // Dump AST for a ptrmask symbol expression. | |
14674 | ||
14675 | void | |
14676 | Ptrmask_symbol_expression::do_dump_expression( | |
14677 | Ast_dump_context* ast_dump_context) const | |
14678 | { | |
14679 | ast_dump_context->ostream() << "ptrmask("; | |
14680 | ast_dump_context->dump_type(this->type_); | |
14681 | ast_dump_context->ostream() << ")"; | |
14682 | } | |
14683 | ||
14684 | // Make a ptrmask symbol expression. | |
14685 | ||
14686 | Expression* | |
14687 | Expression::make_ptrmask_symbol(Type* type) | |
14688 | { | |
14689 | return new Ptrmask_symbol_expression(type); | |
14690 | } | |
14691 | ||
e440a328 | 14692 | // An expression which evaluates to some characteristic of a type. |
14693 | // This is only used to initialize fields of a type descriptor. Using | |
14694 | // a new expression class is slightly inefficient but gives us a good | |
14695 | // separation between the frontend and the middle-end with regard to | |
14696 | // how types are laid out. | |
14697 | ||
14698 | class Type_info_expression : public Expression | |
14699 | { | |
14700 | public: | |
14701 | Type_info_expression(Type* type, Type_info type_info) | |
b13c66cd | 14702 | : Expression(EXPRESSION_TYPE_INFO, Linemap::predeclared_location()), |
e440a328 | 14703 | type_(type), type_info_(type_info) |
14704 | { } | |
14705 | ||
14706 | protected: | |
0e168074 | 14707 | bool |
3ae06f68 | 14708 | do_is_static_initializer() const |
0e168074 | 14709 | { return true; } |
14710 | ||
e440a328 | 14711 | Type* |
14712 | do_type(); | |
14713 | ||
14714 | void | |
14715 | do_determine_type(const Type_context*) | |
14716 | { } | |
14717 | ||
14718 | Expression* | |
14719 | do_copy() | |
14720 | { return this; } | |
14721 | ||
ea664253 | 14722 | Bexpression* |
14723 | do_get_backend(Translate_context* context); | |
e440a328 | 14724 | |
d751bb78 | 14725 | void |
14726 | do_dump_expression(Ast_dump_context*) const; | |
14727 | ||
e440a328 | 14728 | private: |
14729 | // The type for which we are getting information. | |
14730 | Type* type_; | |
14731 | // What information we want. | |
14732 | Type_info type_info_; | |
14733 | }; | |
14734 | ||
14735 | // The type is chosen to match what the type descriptor struct | |
14736 | // expects. | |
14737 | ||
14738 | Type* | |
14739 | Type_info_expression::do_type() | |
14740 | { | |
14741 | switch (this->type_info_) | |
14742 | { | |
14743 | case TYPE_INFO_SIZE: | |
03118c21 | 14744 | case TYPE_INFO_BACKEND_PTRDATA: |
14745 | case TYPE_INFO_DESCRIPTOR_PTRDATA: | |
e440a328 | 14746 | return Type::lookup_integer_type("uintptr"); |
14747 | case TYPE_INFO_ALIGNMENT: | |
14748 | case TYPE_INFO_FIELD_ALIGNMENT: | |
14749 | return Type::lookup_integer_type("uint8"); | |
14750 | default: | |
c3e6f413 | 14751 | go_unreachable(); |
e440a328 | 14752 | } |
14753 | } | |
14754 | ||
ea664253 | 14755 | // Return the backend representation for type information. |
e440a328 | 14756 | |
ea664253 | 14757 | Bexpression* |
14758 | Type_info_expression::do_get_backend(Translate_context* context) | |
e440a328 | 14759 | { |
927a01eb | 14760 | Gogo* gogo = context->gogo(); |
2a305b85 | 14761 | bool ok = true; |
3f378015 | 14762 | int64_t val; |
927a01eb | 14763 | switch (this->type_info_) |
e440a328 | 14764 | { |
927a01eb | 14765 | case TYPE_INFO_SIZE: |
2a305b85 | 14766 | ok = this->type_->backend_type_size(gogo, &val); |
927a01eb | 14767 | break; |
14768 | case TYPE_INFO_ALIGNMENT: | |
2a305b85 | 14769 | ok = this->type_->backend_type_align(gogo, &val); |
927a01eb | 14770 | break; |
14771 | case TYPE_INFO_FIELD_ALIGNMENT: | |
2a305b85 | 14772 | ok = this->type_->backend_type_field_align(gogo, &val); |
927a01eb | 14773 | break; |
03118c21 | 14774 | case TYPE_INFO_BACKEND_PTRDATA: |
14775 | ok = this->type_->backend_type_ptrdata(gogo, &val); | |
14776 | break; | |
14777 | case TYPE_INFO_DESCRIPTOR_PTRDATA: | |
14778 | ok = this->type_->descriptor_ptrdata(gogo, &val); | |
14779 | break; | |
927a01eb | 14780 | default: |
14781 | go_unreachable(); | |
e440a328 | 14782 | } |
2a305b85 | 14783 | if (!ok) |
14784 | { | |
14785 | go_assert(saw_errors()); | |
14786 | return gogo->backend()->error_expression(); | |
14787 | } | |
3f378015 | 14788 | Expression* e = Expression::make_integer_int64(val, this->type(), |
14789 | this->location()); | |
14790 | return e->get_backend(context); | |
e440a328 | 14791 | } |
14792 | ||
d751bb78 | 14793 | // Dump ast representation for a type info expression. |
14794 | ||
14795 | void | |
14796 | Type_info_expression::do_dump_expression( | |
14797 | Ast_dump_context* ast_dump_context) const | |
14798 | { | |
14799 | ast_dump_context->ostream() << "typeinfo("; | |
14800 | ast_dump_context->dump_type(this->type_); | |
14801 | ast_dump_context->ostream() << ","; | |
14802 | ast_dump_context->ostream() << | |
14803 | (this->type_info_ == TYPE_INFO_ALIGNMENT ? "alignment" | |
14804 | : this->type_info_ == TYPE_INFO_FIELD_ALIGNMENT ? "field alignment" | |
03118c21 | 14805 | : this->type_info_ == TYPE_INFO_SIZE ? "size" |
14806 | : this->type_info_ == TYPE_INFO_BACKEND_PTRDATA ? "backend_ptrdata" | |
14807 | : this->type_info_ == TYPE_INFO_DESCRIPTOR_PTRDATA ? "descriptor_ptrdata" | |
d751bb78 | 14808 | : "unknown"); |
14809 | ast_dump_context->ostream() << ")"; | |
14810 | } | |
14811 | ||
e440a328 | 14812 | // Make a type info expression. |
14813 | ||
14814 | Expression* | |
14815 | Expression::make_type_info(Type* type, Type_info type_info) | |
14816 | { | |
14817 | return new Type_info_expression(type, type_info); | |
14818 | } | |
14819 | ||
35a54f17 | 14820 | // An expression that evaluates to some characteristic of a slice. |
14821 | // This is used when indexing, bound-checking, or nil checking a slice. | |
14822 | ||
14823 | class Slice_info_expression : public Expression | |
14824 | { | |
14825 | public: | |
14826 | Slice_info_expression(Expression* slice, Slice_info slice_info, | |
14827 | Location location) | |
14828 | : Expression(EXPRESSION_SLICE_INFO, location), | |
14829 | slice_(slice), slice_info_(slice_info) | |
14830 | { } | |
14831 | ||
14832 | protected: | |
14833 | Type* | |
14834 | do_type(); | |
14835 | ||
14836 | void | |
14837 | do_determine_type(const Type_context*) | |
14838 | { } | |
14839 | ||
14840 | Expression* | |
14841 | do_copy() | |
14842 | { | |
14843 | return new Slice_info_expression(this->slice_->copy(), this->slice_info_, | |
14844 | this->location()); | |
14845 | } | |
14846 | ||
ea664253 | 14847 | Bexpression* |
14848 | do_get_backend(Translate_context* context); | |
35a54f17 | 14849 | |
14850 | void | |
14851 | do_dump_expression(Ast_dump_context*) const; | |
14852 | ||
14853 | void | |
14854 | do_issue_nil_check() | |
14855 | { this->slice_->issue_nil_check(); } | |
14856 | ||
14857 | private: | |
14858 | // The slice for which we are getting information. | |
14859 | Expression* slice_; | |
14860 | // What information we want. | |
14861 | Slice_info slice_info_; | |
14862 | }; | |
14863 | ||
14864 | // Return the type of the slice info. | |
14865 | ||
14866 | Type* | |
14867 | Slice_info_expression::do_type() | |
14868 | { | |
14869 | switch (this->slice_info_) | |
14870 | { | |
14871 | case SLICE_INFO_VALUE_POINTER: | |
14872 | return Type::make_pointer_type( | |
14873 | this->slice_->type()->array_type()->element_type()); | |
14874 | case SLICE_INFO_LENGTH: | |
14875 | case SLICE_INFO_CAPACITY: | |
14876 | return Type::lookup_integer_type("int"); | |
14877 | default: | |
14878 | go_unreachable(); | |
14879 | } | |
14880 | } | |
14881 | ||
ea664253 | 14882 | // Return the backend information for slice information. |
35a54f17 | 14883 | |
ea664253 | 14884 | Bexpression* |
14885 | Slice_info_expression::do_get_backend(Translate_context* context) | |
35a54f17 | 14886 | { |
14887 | Gogo* gogo = context->gogo(); | |
ea664253 | 14888 | Bexpression* bslice = this->slice_->get_backend(context); |
35a54f17 | 14889 | switch (this->slice_info_) |
14890 | { | |
14891 | case SLICE_INFO_VALUE_POINTER: | |
14892 | case SLICE_INFO_LENGTH: | |
14893 | case SLICE_INFO_CAPACITY: | |
ea664253 | 14894 | return gogo->backend()->struct_field_expression(bslice, this->slice_info_, |
14895 | this->location()); | |
35a54f17 | 14896 | break; |
14897 | default: | |
14898 | go_unreachable(); | |
14899 | } | |
35a54f17 | 14900 | } |
14901 | ||
14902 | // Dump ast representation for a type info expression. | |
14903 | ||
14904 | void | |
14905 | Slice_info_expression::do_dump_expression( | |
14906 | Ast_dump_context* ast_dump_context) const | |
14907 | { | |
14908 | ast_dump_context->ostream() << "sliceinfo("; | |
14909 | this->slice_->dump_expression(ast_dump_context); | |
14910 | ast_dump_context->ostream() << ","; | |
14911 | ast_dump_context->ostream() << | |
14912 | (this->slice_info_ == SLICE_INFO_VALUE_POINTER ? "values" | |
14913 | : this->slice_info_ == SLICE_INFO_LENGTH ? "length" | |
14914 | : this->slice_info_ == SLICE_INFO_CAPACITY ? "capacity " | |
14915 | : "unknown"); | |
14916 | ast_dump_context->ostream() << ")"; | |
14917 | } | |
14918 | ||
14919 | // Make a slice info expression. | |
14920 | ||
14921 | Expression* | |
14922 | Expression::make_slice_info(Expression* slice, Slice_info slice_info, | |
14923 | Location location) | |
14924 | { | |
14925 | return new Slice_info_expression(slice, slice_info, location); | |
14926 | } | |
14927 | ||
2c809f8f | 14928 | // An expression that represents a slice value: a struct with value pointer, |
14929 | // length, and capacity fields. | |
14930 | ||
14931 | class Slice_value_expression : public Expression | |
14932 | { | |
14933 | public: | |
14934 | Slice_value_expression(Type* type, Expression* valptr, Expression* len, | |
14935 | Expression* cap, Location location) | |
14936 | : Expression(EXPRESSION_SLICE_VALUE, location), | |
14937 | type_(type), valptr_(valptr), len_(len), cap_(cap) | |
14938 | { } | |
14939 | ||
14940 | protected: | |
14941 | int | |
14942 | do_traverse(Traverse*); | |
14943 | ||
14944 | Type* | |
14945 | do_type() | |
14946 | { return this->type_; } | |
14947 | ||
14948 | void | |
14949 | do_determine_type(const Type_context*) | |
14950 | { go_unreachable(); } | |
14951 | ||
14952 | Expression* | |
14953 | do_copy() | |
14954 | { | |
14955 | return new Slice_value_expression(this->type_, this->valptr_->copy(), | |
14956 | this->len_->copy(), this->cap_->copy(), | |
14957 | this->location()); | |
14958 | } | |
14959 | ||
ea664253 | 14960 | Bexpression* |
14961 | do_get_backend(Translate_context* context); | |
2c809f8f | 14962 | |
14963 | void | |
14964 | do_dump_expression(Ast_dump_context*) const; | |
14965 | ||
14966 | private: | |
14967 | // The type of the slice value. | |
14968 | Type* type_; | |
14969 | // The pointer to the values in the slice. | |
14970 | Expression* valptr_; | |
14971 | // The length of the slice. | |
14972 | Expression* len_; | |
14973 | // The capacity of the slice. | |
14974 | Expression* cap_; | |
14975 | }; | |
14976 | ||
14977 | int | |
14978 | Slice_value_expression::do_traverse(Traverse* traverse) | |
14979 | { | |
55e8ba6a | 14980 | if (Type::traverse(this->type_, traverse) == TRAVERSE_EXIT |
14981 | || Expression::traverse(&this->valptr_, traverse) == TRAVERSE_EXIT | |
2c809f8f | 14982 | || Expression::traverse(&this->len_, traverse) == TRAVERSE_EXIT |
14983 | || Expression::traverse(&this->cap_, traverse) == TRAVERSE_EXIT) | |
14984 | return TRAVERSE_EXIT; | |
14985 | return TRAVERSE_CONTINUE; | |
14986 | } | |
14987 | ||
ea664253 | 14988 | Bexpression* |
14989 | Slice_value_expression::do_get_backend(Translate_context* context) | |
2c809f8f | 14990 | { |
14991 | std::vector<Bexpression*> vals(3); | |
ea664253 | 14992 | vals[0] = this->valptr_->get_backend(context); |
14993 | vals[1] = this->len_->get_backend(context); | |
14994 | vals[2] = this->cap_->get_backend(context); | |
2c809f8f | 14995 | |
14996 | Gogo* gogo = context->gogo(); | |
14997 | Btype* btype = this->type_->get_backend(gogo); | |
ea664253 | 14998 | return gogo->backend()->constructor_expression(btype, vals, this->location()); |
2c809f8f | 14999 | } |
15000 | ||
15001 | void | |
15002 | Slice_value_expression::do_dump_expression( | |
15003 | Ast_dump_context* ast_dump_context) const | |
15004 | { | |
15005 | ast_dump_context->ostream() << "slicevalue("; | |
15006 | ast_dump_context->ostream() << "values: "; | |
15007 | this->valptr_->dump_expression(ast_dump_context); | |
15008 | ast_dump_context->ostream() << ", length: "; | |
15009 | this->len_->dump_expression(ast_dump_context); | |
15010 | ast_dump_context->ostream() << ", capacity: "; | |
15011 | this->cap_->dump_expression(ast_dump_context); | |
15012 | ast_dump_context->ostream() << ")"; | |
15013 | } | |
15014 | ||
15015 | Expression* | |
15016 | Expression::make_slice_value(Type* at, Expression* valptr, Expression* len, | |
15017 | Expression* cap, Location location) | |
15018 | { | |
15019 | go_assert(at->is_slice_type()); | |
15020 | return new Slice_value_expression(at, valptr, len, cap, location); | |
15021 | } | |
2387f644 | 15022 | |
15023 | // An expression that evaluates to some characteristic of a non-empty interface. | |
15024 | // This is used to access the method table or underlying object of an interface. | |
15025 | ||
15026 | class Interface_info_expression : public Expression | |
15027 | { | |
15028 | public: | |
15029 | Interface_info_expression(Expression* iface, Interface_info iface_info, | |
2c809f8f | 15030 | Location location) |
2387f644 | 15031 | : Expression(EXPRESSION_INTERFACE_INFO, location), |
15032 | iface_(iface), iface_info_(iface_info) | |
15033 | { } | |
15034 | ||
15035 | protected: | |
15036 | Type* | |
15037 | do_type(); | |
15038 | ||
15039 | void | |
15040 | do_determine_type(const Type_context*) | |
15041 | { } | |
15042 | ||
15043 | Expression* | |
15044 | do_copy() | |
15045 | { | |
15046 | return new Interface_info_expression(this->iface_->copy(), | |
15047 | this->iface_info_, this->location()); | |
15048 | } | |
15049 | ||
ea664253 | 15050 | Bexpression* |
15051 | do_get_backend(Translate_context* context); | |
2387f644 | 15052 | |
15053 | void | |
15054 | do_dump_expression(Ast_dump_context*) const; | |
15055 | ||
15056 | void | |
15057 | do_issue_nil_check() | |
15058 | { this->iface_->issue_nil_check(); } | |
15059 | ||
15060 | private: | |
15061 | // The interface for which we are getting information. | |
15062 | Expression* iface_; | |
15063 | // What information we want. | |
15064 | Interface_info iface_info_; | |
15065 | }; | |
15066 | ||
15067 | // Return the type of the interface info. | |
15068 | ||
15069 | Type* | |
15070 | Interface_info_expression::do_type() | |
15071 | { | |
15072 | switch (this->iface_info_) | |
15073 | { | |
15074 | case INTERFACE_INFO_METHODS: | |
15075 | { | |
625d3118 | 15076 | typedef Unordered_map(Interface_type*, Type*) Hashtable; |
15077 | static Hashtable result_types; | |
15078 | ||
15079 | Interface_type* itype = this->iface_->type()->interface_type(); | |
15080 | ||
15081 | Hashtable::const_iterator p = result_types.find(itype); | |
15082 | if (p != result_types.end()) | |
15083 | return p->second; | |
15084 | ||
2c809f8f | 15085 | Type* pdt = Type::make_type_descriptor_ptr_type(); |
625d3118 | 15086 | if (itype->is_empty()) |
15087 | { | |
15088 | result_types[itype] = pdt; | |
15089 | return pdt; | |
15090 | } | |
2c809f8f | 15091 | |
2387f644 | 15092 | Location loc = this->location(); |
15093 | Struct_field_list* sfl = new Struct_field_list(); | |
2387f644 | 15094 | sfl->push_back( |
15095 | Struct_field(Typed_identifier("__type_descriptor", pdt, loc))); | |
15096 | ||
2387f644 | 15097 | for (Typed_identifier_list::const_iterator p = itype->methods()->begin(); |
15098 | p != itype->methods()->end(); | |
15099 | ++p) | |
15100 | { | |
15101 | Function_type* ft = p->type()->function_type(); | |
15102 | go_assert(ft->receiver() == NULL); | |
15103 | ||
15104 | const Typed_identifier_list* params = ft->parameters(); | |
15105 | Typed_identifier_list* mparams = new Typed_identifier_list(); | |
15106 | if (params != NULL) | |
15107 | mparams->reserve(params->size() + 1); | |
15108 | Type* vt = Type::make_pointer_type(Type::make_void_type()); | |
15109 | mparams->push_back(Typed_identifier("", vt, ft->location())); | |
15110 | if (params != NULL) | |
15111 | { | |
15112 | for (Typed_identifier_list::const_iterator pp = params->begin(); | |
15113 | pp != params->end(); | |
15114 | ++pp) | |
15115 | mparams->push_back(*pp); | |
15116 | } | |
15117 | ||
15118 | Typed_identifier_list* mresults = (ft->results() == NULL | |
15119 | ? NULL | |
15120 | : ft->results()->copy()); | |
15121 | Backend_function_type* mft = | |
15122 | Type::make_backend_function_type(NULL, mparams, mresults, | |
15123 | ft->location()); | |
15124 | ||
15125 | std::string fname = Gogo::unpack_hidden_name(p->name()); | |
15126 | sfl->push_back(Struct_field(Typed_identifier(fname, mft, loc))); | |
15127 | } | |
15128 | ||
6bf4793c | 15129 | Struct_type* st = Type::make_struct_type(sfl, loc); |
15130 | st->set_is_struct_incomparable(); | |
15131 | Pointer_type *pt = Type::make_pointer_type(st); | |
625d3118 | 15132 | result_types[itype] = pt; |
15133 | return pt; | |
2387f644 | 15134 | } |
15135 | case INTERFACE_INFO_OBJECT: | |
15136 | return Type::make_pointer_type(Type::make_void_type()); | |
15137 | default: | |
15138 | go_unreachable(); | |
15139 | } | |
15140 | } | |
15141 | ||
ea664253 | 15142 | // Return the backend representation for interface information. |
2387f644 | 15143 | |
ea664253 | 15144 | Bexpression* |
15145 | Interface_info_expression::do_get_backend(Translate_context* context) | |
2387f644 | 15146 | { |
15147 | Gogo* gogo = context->gogo(); | |
ea664253 | 15148 | Bexpression* biface = this->iface_->get_backend(context); |
2387f644 | 15149 | switch (this->iface_info_) |
15150 | { | |
15151 | case INTERFACE_INFO_METHODS: | |
15152 | case INTERFACE_INFO_OBJECT: | |
ea664253 | 15153 | return gogo->backend()->struct_field_expression(biface, this->iface_info_, |
15154 | this->location()); | |
2387f644 | 15155 | break; |
15156 | default: | |
15157 | go_unreachable(); | |
15158 | } | |
2387f644 | 15159 | } |
15160 | ||
15161 | // Dump ast representation for an interface info expression. | |
15162 | ||
15163 | void | |
15164 | Interface_info_expression::do_dump_expression( | |
15165 | Ast_dump_context* ast_dump_context) const | |
15166 | { | |
2c809f8f | 15167 | bool is_empty = this->iface_->type()->interface_type()->is_empty(); |
2387f644 | 15168 | ast_dump_context->ostream() << "interfaceinfo("; |
15169 | this->iface_->dump_expression(ast_dump_context); | |
15170 | ast_dump_context->ostream() << ","; | |
15171 | ast_dump_context->ostream() << | |
2c809f8f | 15172 | (this->iface_info_ == INTERFACE_INFO_METHODS && !is_empty ? "methods" |
15173 | : this->iface_info_ == INTERFACE_INFO_TYPE_DESCRIPTOR ? "type_descriptor" | |
2387f644 | 15174 | : this->iface_info_ == INTERFACE_INFO_OBJECT ? "object" |
15175 | : "unknown"); | |
15176 | ast_dump_context->ostream() << ")"; | |
15177 | } | |
15178 | ||
15179 | // Make an interface info expression. | |
15180 | ||
15181 | Expression* | |
15182 | Expression::make_interface_info(Expression* iface, Interface_info iface_info, | |
15183 | Location location) | |
15184 | { | |
15185 | return new Interface_info_expression(iface, iface_info, location); | |
15186 | } | |
15187 | ||
2c809f8f | 15188 | // An expression that represents an interface value. The first field is either |
15189 | // a type descriptor for an empty interface or a pointer to the interface method | |
15190 | // table for a non-empty interface. The second field is always the object. | |
15191 | ||
15192 | class Interface_value_expression : public Expression | |
15193 | { | |
15194 | public: | |
15195 | Interface_value_expression(Type* type, Expression* first_field, | |
15196 | Expression* obj, Location location) | |
15197 | : Expression(EXPRESSION_INTERFACE_VALUE, location), | |
15198 | type_(type), first_field_(first_field), obj_(obj) | |
15199 | { } | |
15200 | ||
15201 | protected: | |
15202 | int | |
15203 | do_traverse(Traverse*); | |
15204 | ||
15205 | Type* | |
15206 | do_type() | |
15207 | { return this->type_; } | |
15208 | ||
15209 | void | |
15210 | do_determine_type(const Type_context*) | |
15211 | { go_unreachable(); } | |
15212 | ||
15213 | Expression* | |
15214 | do_copy() | |
15215 | { | |
15216 | return new Interface_value_expression(this->type_, | |
15217 | this->first_field_->copy(), | |
15218 | this->obj_->copy(), this->location()); | |
15219 | } | |
15220 | ||
ea664253 | 15221 | Bexpression* |
15222 | do_get_backend(Translate_context* context); | |
2c809f8f | 15223 | |
15224 | void | |
15225 | do_dump_expression(Ast_dump_context*) const; | |
15226 | ||
15227 | private: | |
15228 | // The type of the interface value. | |
15229 | Type* type_; | |
15230 | // The first field of the interface (either a type descriptor or a pointer | |
15231 | // to the method table. | |
15232 | Expression* first_field_; | |
15233 | // The underlying object of the interface. | |
15234 | Expression* obj_; | |
15235 | }; | |
15236 | ||
15237 | int | |
15238 | Interface_value_expression::do_traverse(Traverse* traverse) | |
15239 | { | |
15240 | if (Expression::traverse(&this->first_field_, traverse) == TRAVERSE_EXIT | |
15241 | || Expression::traverse(&this->obj_, traverse) == TRAVERSE_EXIT) | |
15242 | return TRAVERSE_EXIT; | |
15243 | return TRAVERSE_CONTINUE; | |
15244 | } | |
15245 | ||
ea664253 | 15246 | Bexpression* |
15247 | Interface_value_expression::do_get_backend(Translate_context* context) | |
2c809f8f | 15248 | { |
15249 | std::vector<Bexpression*> vals(2); | |
ea664253 | 15250 | vals[0] = this->first_field_->get_backend(context); |
15251 | vals[1] = this->obj_->get_backend(context); | |
2c809f8f | 15252 | |
15253 | Gogo* gogo = context->gogo(); | |
15254 | Btype* btype = this->type_->get_backend(gogo); | |
ea664253 | 15255 | return gogo->backend()->constructor_expression(btype, vals, this->location()); |
2c809f8f | 15256 | } |
15257 | ||
15258 | void | |
15259 | Interface_value_expression::do_dump_expression( | |
15260 | Ast_dump_context* ast_dump_context) const | |
15261 | { | |
15262 | ast_dump_context->ostream() << "interfacevalue("; | |
15263 | ast_dump_context->ostream() << | |
15264 | (this->type_->interface_type()->is_empty() | |
15265 | ? "type_descriptor: " | |
15266 | : "methods: "); | |
15267 | this->first_field_->dump_expression(ast_dump_context); | |
15268 | ast_dump_context->ostream() << ", object: "; | |
15269 | this->obj_->dump_expression(ast_dump_context); | |
15270 | ast_dump_context->ostream() << ")"; | |
15271 | } | |
15272 | ||
15273 | Expression* | |
15274 | Expression::make_interface_value(Type* type, Expression* first_value, | |
15275 | Expression* object, Location location) | |
15276 | { | |
15277 | return new Interface_value_expression(type, first_value, object, location); | |
15278 | } | |
15279 | ||
15280 | // An interface method table for a pair of types: an interface type and a type | |
15281 | // that implements that interface. | |
15282 | ||
15283 | class Interface_mtable_expression : public Expression | |
15284 | { | |
15285 | public: | |
15286 | Interface_mtable_expression(Interface_type* itype, Type* type, | |
15287 | bool is_pointer, Location location) | |
15288 | : Expression(EXPRESSION_INTERFACE_MTABLE, location), | |
15289 | itype_(itype), type_(type), is_pointer_(is_pointer), | |
15290 | method_table_type_(NULL), bvar_(NULL) | |
15291 | { } | |
15292 | ||
15293 | protected: | |
15294 | int | |
15295 | do_traverse(Traverse*); | |
15296 | ||
15297 | Type* | |
15298 | do_type(); | |
15299 | ||
15300 | bool | |
3ae06f68 | 15301 | do_is_static_initializer() const |
2c809f8f | 15302 | { return true; } |
15303 | ||
15304 | void | |
15305 | do_determine_type(const Type_context*) | |
15306 | { go_unreachable(); } | |
15307 | ||
15308 | Expression* | |
15309 | do_copy() | |
15310 | { | |
15311 | return new Interface_mtable_expression(this->itype_, this->type_, | |
15312 | this->is_pointer_, this->location()); | |
15313 | } | |
15314 | ||
15315 | bool | |
15316 | do_is_addressable() const | |
15317 | { return true; } | |
15318 | ||
ea664253 | 15319 | Bexpression* |
15320 | do_get_backend(Translate_context* context); | |
2c809f8f | 15321 | |
15322 | void | |
15323 | do_dump_expression(Ast_dump_context*) const; | |
15324 | ||
15325 | private: | |
15326 | // The interface type for which the methods are defined. | |
15327 | Interface_type* itype_; | |
15328 | // The type to construct the interface method table for. | |
15329 | Type* type_; | |
15330 | // Whether this table contains the method set for the receiver type or the | |
15331 | // pointer receiver type. | |
15332 | bool is_pointer_; | |
15333 | // The type of the method table. | |
15334 | Type* method_table_type_; | |
15335 | // The backend variable that refers to the interface method table. | |
15336 | Bvariable* bvar_; | |
15337 | }; | |
15338 | ||
15339 | int | |
15340 | Interface_mtable_expression::do_traverse(Traverse* traverse) | |
15341 | { | |
15342 | if (Type::traverse(this->itype_, traverse) == TRAVERSE_EXIT | |
15343 | || Type::traverse(this->type_, traverse) == TRAVERSE_EXIT) | |
15344 | return TRAVERSE_EXIT; | |
15345 | return TRAVERSE_CONTINUE; | |
15346 | } | |
15347 | ||
15348 | Type* | |
15349 | Interface_mtable_expression::do_type() | |
15350 | { | |
15351 | if (this->method_table_type_ != NULL) | |
15352 | return this->method_table_type_; | |
15353 | ||
15354 | const Typed_identifier_list* interface_methods = this->itype_->methods(); | |
15355 | go_assert(!interface_methods->empty()); | |
15356 | ||
15357 | Struct_field_list* sfl = new Struct_field_list; | |
15358 | Typed_identifier tid("__type_descriptor", Type::make_type_descriptor_ptr_type(), | |
15359 | this->location()); | |
15360 | sfl->push_back(Struct_field(tid)); | |
db122cb9 | 15361 | Type* unsafe_ptr_type = Type::make_pointer_type(Type::make_void_type()); |
2c809f8f | 15362 | for (Typed_identifier_list::const_iterator p = interface_methods->begin(); |
15363 | p != interface_methods->end(); | |
15364 | ++p) | |
db122cb9 | 15365 | { |
15366 | // We want C function pointers here, not func descriptors; model | |
15367 | // using void* pointers. | |
15368 | Typed_identifier method(p->name(), unsafe_ptr_type, p->location()); | |
15369 | sfl->push_back(Struct_field(method)); | |
15370 | } | |
6bf4793c | 15371 | Struct_type* st = Type::make_struct_type(sfl, this->location()); |
15372 | st->set_is_struct_incomparable(); | |
15373 | this->method_table_type_ = st; | |
2c809f8f | 15374 | return this->method_table_type_; |
15375 | } | |
15376 | ||
ea664253 | 15377 | Bexpression* |
15378 | Interface_mtable_expression::do_get_backend(Translate_context* context) | |
2c809f8f | 15379 | { |
15380 | Gogo* gogo = context->gogo(); | |
2c809f8f | 15381 | Location loc = Linemap::predeclared_location(); |
15382 | if (this->bvar_ != NULL) | |
d4e6573e | 15383 | return gogo->backend()->var_expression(this->bvar_, VE_rvalue, |
15384 | this->location()); | |
2c809f8f | 15385 | |
15386 | const Typed_identifier_list* interface_methods = this->itype_->methods(); | |
15387 | go_assert(!interface_methods->empty()); | |
15388 | ||
19272321 | 15389 | std::string mangled_name = |
15390 | gogo->interface_method_table_name(this->itype_, this->type_, | |
15391 | this->is_pointer_); | |
2c809f8f | 15392 | |
1530c754 | 15393 | // Set is_public if we are converting a named type to an interface |
15394 | // type that is defined in the same package as the named type, and | |
15395 | // the interface has hidden methods. In that case the interface | |
15396 | // method table will be defined by the package that defines the | |
15397 | // types. | |
15398 | bool is_public = false; | |
15399 | if (this->type_->named_type() != NULL | |
15400 | && (this->type_->named_type()->named_object()->package() | |
15401 | == this->itype_->package())) | |
15402 | { | |
15403 | for (Typed_identifier_list::const_iterator p = interface_methods->begin(); | |
15404 | p != interface_methods->end(); | |
15405 | ++p) | |
2c809f8f | 15406 | { |
1530c754 | 15407 | if (Gogo::is_hidden_name(p->name())) |
15408 | { | |
15409 | is_public = true; | |
15410 | break; | |
15411 | } | |
2c809f8f | 15412 | } |
15413 | } | |
15414 | ||
1530c754 | 15415 | if (is_public |
2c809f8f | 15416 | && this->type_->named_type()->named_object()->package() != NULL) |
15417 | { | |
1530c754 | 15418 | // The interface conversion table is defined elsewhere. |
2c809f8f | 15419 | Btype* btype = this->type()->get_backend(gogo); |
438b4bec | 15420 | std::string asm_name(go_selectively_encode_id(mangled_name)); |
2c809f8f | 15421 | this->bvar_ = |
438b4bec | 15422 | gogo->backend()->immutable_struct_reference(mangled_name, asm_name, |
15423 | btype, loc); | |
d4e6573e | 15424 | return gogo->backend()->var_expression(this->bvar_, VE_rvalue, |
15425 | this->location()); | |
2c809f8f | 15426 | } |
15427 | ||
15428 | // The first element is the type descriptor. | |
15429 | Type* td_type; | |
15430 | if (!this->is_pointer_) | |
15431 | td_type = this->type_; | |
15432 | else | |
15433 | td_type = Type::make_pointer_type(this->type_); | |
15434 | ||
db122cb9 | 15435 | std::vector<Backend::Btyped_identifier> bstructfields; |
15436 | ||
2c809f8f | 15437 | // Build an interface method table for a type: a type descriptor followed by a |
15438 | // list of function pointers, one for each interface method. This is used for | |
15439 | // interfaces. | |
15440 | Expression_list* svals = new Expression_list(); | |
db122cb9 | 15441 | Expression* tdescriptor = Expression::make_type_descriptor(td_type, loc); |
15442 | svals->push_back(tdescriptor); | |
15443 | ||
15444 | Btype* tdesc_btype = tdescriptor->type()->get_backend(gogo); | |
15445 | Backend::Btyped_identifier btd("_type", tdesc_btype, loc); | |
15446 | bstructfields.push_back(btd); | |
2c809f8f | 15447 | |
15448 | Named_type* nt = this->type_->named_type(); | |
15449 | Struct_type* st = this->type_->struct_type(); | |
15450 | go_assert(nt != NULL || st != NULL); | |
15451 | ||
15452 | for (Typed_identifier_list::const_iterator p = interface_methods->begin(); | |
15453 | p != interface_methods->end(); | |
15454 | ++p) | |
15455 | { | |
15456 | bool is_ambiguous; | |
15457 | Method* m; | |
15458 | if (nt != NULL) | |
15459 | m = nt->method_function(p->name(), &is_ambiguous); | |
15460 | else | |
15461 | m = st->method_function(p->name(), &is_ambiguous); | |
15462 | go_assert(m != NULL); | |
15463 | Named_object* no = m->named_object(); | |
15464 | ||
15465 | go_assert(no->is_function() || no->is_function_declaration()); | |
db122cb9 | 15466 | |
15467 | Btype* fcn_btype = m->type()->get_backend_fntype(gogo); | |
15468 | Backend::Btyped_identifier bmtype(p->name(), fcn_btype, loc); | |
15469 | bstructfields.push_back(bmtype); | |
15470 | ||
2c809f8f | 15471 | svals->push_back(Expression::make_func_code_reference(no, loc)); |
15472 | } | |
15473 | ||
db122cb9 | 15474 | Btype *btype = gogo->backend()->struct_type(bstructfields); |
15475 | std::vector<Bexpression*> ctor_bexprs; | |
15476 | for (Expression_list::const_iterator pe = svals->begin(); | |
15477 | pe != svals->end(); | |
15478 | ++pe) | |
15479 | { | |
15480 | ctor_bexprs.push_back((*pe)->get_backend(context)); | |
15481 | } | |
15482 | Bexpression* ctor = | |
15483 | gogo->backend()->constructor_expression(btype, ctor_bexprs, loc); | |
2c809f8f | 15484 | |
438b4bec | 15485 | std::string asm_name(go_selectively_encode_id(mangled_name)); |
15486 | this->bvar_ = gogo->backend()->immutable_struct(mangled_name, asm_name, false, | |
2c809f8f | 15487 | !is_public, btype, loc); |
15488 | gogo->backend()->immutable_struct_set_init(this->bvar_, mangled_name, false, | |
15489 | !is_public, btype, loc, ctor); | |
d4e6573e | 15490 | return gogo->backend()->var_expression(this->bvar_, VE_lvalue, loc); |
2c809f8f | 15491 | } |
15492 | ||
15493 | void | |
15494 | Interface_mtable_expression::do_dump_expression( | |
15495 | Ast_dump_context* ast_dump_context) const | |
15496 | { | |
15497 | ast_dump_context->ostream() << "__go_" | |
15498 | << (this->is_pointer_ ? "pimt__" : "imt_"); | |
15499 | ast_dump_context->dump_type(this->itype_); | |
15500 | ast_dump_context->ostream() << "__"; | |
15501 | ast_dump_context->dump_type(this->type_); | |
15502 | } | |
15503 | ||
15504 | Expression* | |
15505 | Expression::make_interface_mtable_ref(Interface_type* itype, Type* type, | |
15506 | bool is_pointer, Location location) | |
15507 | { | |
15508 | return new Interface_mtable_expression(itype, type, is_pointer, location); | |
15509 | } | |
15510 | ||
e440a328 | 15511 | // An expression which evaluates to the offset of a field within a |
15512 | // struct. This, like Type_info_expression, q.v., is only used to | |
15513 | // initialize fields of a type descriptor. | |
15514 | ||
15515 | class Struct_field_offset_expression : public Expression | |
15516 | { | |
15517 | public: | |
15518 | Struct_field_offset_expression(Struct_type* type, const Struct_field* field) | |
b13c66cd | 15519 | : Expression(EXPRESSION_STRUCT_FIELD_OFFSET, |
15520 | Linemap::predeclared_location()), | |
e440a328 | 15521 | type_(type), field_(field) |
15522 | { } | |
15523 | ||
15524 | protected: | |
f23d7786 | 15525 | bool |
3ae06f68 | 15526 | do_is_static_initializer() const |
f23d7786 | 15527 | { return true; } |
15528 | ||
e440a328 | 15529 | Type* |
15530 | do_type() | |
15531 | { return Type::lookup_integer_type("uintptr"); } | |
15532 | ||
15533 | void | |
15534 | do_determine_type(const Type_context*) | |
15535 | { } | |
15536 | ||
15537 | Expression* | |
15538 | do_copy() | |
15539 | { return this; } | |
15540 | ||
ea664253 | 15541 | Bexpression* |
15542 | do_get_backend(Translate_context* context); | |
e440a328 | 15543 | |
d751bb78 | 15544 | void |
15545 | do_dump_expression(Ast_dump_context*) const; | |
15546 | ||
e440a328 | 15547 | private: |
15548 | // The type of the struct. | |
15549 | Struct_type* type_; | |
15550 | // The field. | |
15551 | const Struct_field* field_; | |
15552 | }; | |
15553 | ||
ea664253 | 15554 | // Return the backend representation for a struct field offset. |
e440a328 | 15555 | |
ea664253 | 15556 | Bexpression* |
15557 | Struct_field_offset_expression::do_get_backend(Translate_context* context) | |
e440a328 | 15558 | { |
e440a328 | 15559 | const Struct_field_list* fields = this->type_->fields(); |
e440a328 | 15560 | Struct_field_list::const_iterator p; |
2c8bda43 | 15561 | unsigned i = 0; |
e440a328 | 15562 | for (p = fields->begin(); |
15563 | p != fields->end(); | |
2c8bda43 | 15564 | ++p, ++i) |
15565 | if (&*p == this->field_) | |
15566 | break; | |
c484d925 | 15567 | go_assert(&*p == this->field_); |
e440a328 | 15568 | |
2c8bda43 | 15569 | Gogo* gogo = context->gogo(); |
15570 | Btype* btype = this->type_->get_backend(gogo); | |
15571 | ||
3f378015 | 15572 | int64_t offset = gogo->backend()->type_field_offset(btype, i); |
2c8bda43 | 15573 | Type* uptr_type = Type::lookup_integer_type("uintptr"); |
e67508fa | 15574 | Expression* ret = |
3f378015 | 15575 | Expression::make_integer_int64(offset, uptr_type, |
15576 | Linemap::predeclared_location()); | |
ea664253 | 15577 | return ret->get_backend(context); |
e440a328 | 15578 | } |
15579 | ||
d751bb78 | 15580 | // Dump ast representation for a struct field offset expression. |
15581 | ||
15582 | void | |
15583 | Struct_field_offset_expression::do_dump_expression( | |
15584 | Ast_dump_context* ast_dump_context) const | |
15585 | { | |
15586 | ast_dump_context->ostream() << "unsafe.Offsetof("; | |
2d29d278 | 15587 | ast_dump_context->dump_type(this->type_); |
15588 | ast_dump_context->ostream() << '.'; | |
15589 | ast_dump_context->ostream() << | |
15590 | Gogo::message_name(this->field_->field_name()); | |
d751bb78 | 15591 | ast_dump_context->ostream() << ")"; |
15592 | } | |
15593 | ||
e440a328 | 15594 | // Make an expression for a struct field offset. |
15595 | ||
15596 | Expression* | |
15597 | Expression::make_struct_field_offset(Struct_type* type, | |
15598 | const Struct_field* field) | |
15599 | { | |
15600 | return new Struct_field_offset_expression(type, field); | |
15601 | } | |
15602 | ||
15603 | // An expression which evaluates to the address of an unnamed label. | |
15604 | ||
15605 | class Label_addr_expression : public Expression | |
15606 | { | |
15607 | public: | |
b13c66cd | 15608 | Label_addr_expression(Label* label, Location location) |
e440a328 | 15609 | : Expression(EXPRESSION_LABEL_ADDR, location), |
15610 | label_(label) | |
15611 | { } | |
15612 | ||
15613 | protected: | |
15614 | Type* | |
15615 | do_type() | |
15616 | { return Type::make_pointer_type(Type::make_void_type()); } | |
15617 | ||
15618 | void | |
15619 | do_determine_type(const Type_context*) | |
15620 | { } | |
15621 | ||
15622 | Expression* | |
15623 | do_copy() | |
15624 | { return new Label_addr_expression(this->label_, this->location()); } | |
15625 | ||
ea664253 | 15626 | Bexpression* |
15627 | do_get_backend(Translate_context* context) | |
15628 | { return this->label_->get_addr(context, this->location()); } | |
e440a328 | 15629 | |
d751bb78 | 15630 | void |
15631 | do_dump_expression(Ast_dump_context* ast_dump_context) const | |
15632 | { ast_dump_context->ostream() << this->label_->name(); } | |
15633 | ||
e440a328 | 15634 | private: |
15635 | // The label whose address we are taking. | |
15636 | Label* label_; | |
15637 | }; | |
15638 | ||
15639 | // Make an expression for the address of an unnamed label. | |
15640 | ||
15641 | Expression* | |
b13c66cd | 15642 | Expression::make_label_addr(Label* label, Location location) |
e440a328 | 15643 | { |
15644 | return new Label_addr_expression(label, location); | |
15645 | } | |
15646 | ||
da244e59 | 15647 | // Class Conditional_expression. |
283a177b | 15648 | |
2c809f8f | 15649 | // Traversal. |
15650 | ||
15651 | int | |
15652 | Conditional_expression::do_traverse(Traverse* traverse) | |
15653 | { | |
15654 | if (Expression::traverse(&this->cond_, traverse) == TRAVERSE_EXIT | |
15655 | || Expression::traverse(&this->then_, traverse) == TRAVERSE_EXIT | |
15656 | || Expression::traverse(&this->else_, traverse) == TRAVERSE_EXIT) | |
15657 | return TRAVERSE_EXIT; | |
15658 | return TRAVERSE_CONTINUE; | |
15659 | } | |
15660 | ||
283a177b | 15661 | // Return the type of the conditional expression. |
15662 | ||
15663 | Type* | |
15664 | Conditional_expression::do_type() | |
15665 | { | |
15666 | Type* result_type = Type::make_void_type(); | |
2c809f8f | 15667 | if (Type::are_identical(this->then_->type(), this->else_->type(), false, |
15668 | NULL)) | |
283a177b | 15669 | result_type = this->then_->type(); |
15670 | else if (this->then_->is_nil_expression() | |
15671 | || this->else_->is_nil_expression()) | |
15672 | result_type = (!this->then_->is_nil_expression() | |
15673 | ? this->then_->type() | |
15674 | : this->else_->type()); | |
15675 | return result_type; | |
15676 | } | |
15677 | ||
2c809f8f | 15678 | // Determine type for a conditional expression. |
15679 | ||
15680 | void | |
15681 | Conditional_expression::do_determine_type(const Type_context* context) | |
15682 | { | |
15683 | this->cond_->determine_type_no_context(); | |
15684 | this->then_->determine_type(context); | |
15685 | this->else_->determine_type(context); | |
15686 | } | |
15687 | ||
283a177b | 15688 | // Get the backend representation of a conditional expression. |
15689 | ||
ea664253 | 15690 | Bexpression* |
15691 | Conditional_expression::do_get_backend(Translate_context* context) | |
283a177b | 15692 | { |
15693 | Gogo* gogo = context->gogo(); | |
15694 | Btype* result_btype = this->type()->get_backend(gogo); | |
ea664253 | 15695 | Bexpression* cond = this->cond_->get_backend(context); |
15696 | Bexpression* then = this->then_->get_backend(context); | |
15697 | Bexpression* belse = this->else_->get_backend(context); | |
93715b75 | 15698 | Bfunction* bfn = context->function()->func_value()->get_decl(); |
15699 | return gogo->backend()->conditional_expression(bfn, result_btype, cond, then, | |
ea664253 | 15700 | belse, this->location()); |
283a177b | 15701 | } |
15702 | ||
15703 | // Dump ast representation of a conditional expression. | |
15704 | ||
15705 | void | |
15706 | Conditional_expression::do_dump_expression( | |
15707 | Ast_dump_context* ast_dump_context) const | |
15708 | { | |
15709 | ast_dump_context->ostream() << "("; | |
15710 | ast_dump_context->dump_expression(this->cond_); | |
15711 | ast_dump_context->ostream() << " ? "; | |
15712 | ast_dump_context->dump_expression(this->then_); | |
15713 | ast_dump_context->ostream() << " : "; | |
15714 | ast_dump_context->dump_expression(this->else_); | |
15715 | ast_dump_context->ostream() << ") "; | |
15716 | } | |
15717 | ||
15718 | // Make a conditional expression. | |
15719 | ||
15720 | Expression* | |
15721 | Expression::make_conditional(Expression* cond, Expression* then, | |
15722 | Expression* else_expr, Location location) | |
15723 | { | |
15724 | return new Conditional_expression(cond, then, else_expr, location); | |
15725 | } | |
15726 | ||
da244e59 | 15727 | // Class Compound_expression. |
2c809f8f | 15728 | |
15729 | // Traversal. | |
15730 | ||
15731 | int | |
15732 | Compound_expression::do_traverse(Traverse* traverse) | |
15733 | { | |
15734 | if (Expression::traverse(&this->init_, traverse) == TRAVERSE_EXIT | |
15735 | || Expression::traverse(&this->expr_, traverse) == TRAVERSE_EXIT) | |
15736 | return TRAVERSE_EXIT; | |
15737 | return TRAVERSE_CONTINUE; | |
15738 | } | |
15739 | ||
15740 | // Return the type of the compound expression. | |
15741 | ||
15742 | Type* | |
15743 | Compound_expression::do_type() | |
15744 | { | |
15745 | return this->expr_->type(); | |
15746 | } | |
15747 | ||
15748 | // Determine type for a compound expression. | |
15749 | ||
15750 | void | |
15751 | Compound_expression::do_determine_type(const Type_context* context) | |
15752 | { | |
15753 | this->init_->determine_type_no_context(); | |
15754 | this->expr_->determine_type(context); | |
15755 | } | |
15756 | ||
15757 | // Get the backend representation of a compound expression. | |
15758 | ||
ea664253 | 15759 | Bexpression* |
15760 | Compound_expression::do_get_backend(Translate_context* context) | |
2c809f8f | 15761 | { |
15762 | Gogo* gogo = context->gogo(); | |
ea664253 | 15763 | Bexpression* binit = this->init_->get_backend(context); |
0ab48656 | 15764 | Bfunction* bfunction = context->function()->func_value()->get_decl(); |
15765 | Bstatement* init_stmt = gogo->backend()->expression_statement(bfunction, | |
15766 | binit); | |
ea664253 | 15767 | Bexpression* bexpr = this->expr_->get_backend(context); |
15768 | return gogo->backend()->compound_expression(init_stmt, bexpr, | |
15769 | this->location()); | |
2c809f8f | 15770 | } |
15771 | ||
15772 | // Dump ast representation of a conditional expression. | |
15773 | ||
15774 | void | |
15775 | Compound_expression::do_dump_expression( | |
15776 | Ast_dump_context* ast_dump_context) const | |
15777 | { | |
15778 | ast_dump_context->ostream() << "("; | |
15779 | ast_dump_context->dump_expression(this->init_); | |
15780 | ast_dump_context->ostream() << ","; | |
15781 | ast_dump_context->dump_expression(this->expr_); | |
15782 | ast_dump_context->ostream() << ") "; | |
15783 | } | |
15784 | ||
15785 | // Make a compound expression. | |
15786 | ||
15787 | Expression* | |
15788 | Expression::make_compound(Expression* init, Expression* expr, Location location) | |
15789 | { | |
15790 | return new Compound_expression(init, expr, location); | |
15791 | } | |
15792 | ||
1b4fb1e0 | 15793 | // Class Backend_expression. |
15794 | ||
15795 | int | |
15796 | Backend_expression::do_traverse(Traverse*) | |
15797 | { | |
15798 | return TRAVERSE_CONTINUE; | |
15799 | } | |
15800 | ||
15801 | void | |
15802 | Backend_expression::do_dump_expression(Ast_dump_context* ast_dump_context) const | |
15803 | { | |
15804 | ast_dump_context->ostream() << "backend_expression<"; | |
15805 | ast_dump_context->dump_type(this->type_); | |
15806 | ast_dump_context->ostream() << ">"; | |
15807 | } | |
15808 | ||
15809 | Expression* | |
15810 | Expression::make_backend(Bexpression* bexpr, Type* type, Location location) | |
15811 | { | |
15812 | return new Backend_expression(bexpr, type, location); | |
15813 | } | |
15814 | ||
e440a328 | 15815 | // Import an expression. This comes at the end in order to see the |
15816 | // various class definitions. | |
15817 | ||
15818 | Expression* | |
15819 | Expression::import_expression(Import* imp) | |
15820 | { | |
15821 | int c = imp->peek_char(); | |
15822 | if (imp->match_c_string("- ") | |
15823 | || imp->match_c_string("! ") | |
15824 | || imp->match_c_string("^ ")) | |
15825 | return Unary_expression::do_import(imp); | |
15826 | else if (c == '(') | |
15827 | return Binary_expression::do_import(imp); | |
15828 | else if (imp->match_c_string("true") | |
15829 | || imp->match_c_string("false")) | |
15830 | return Boolean_expression::do_import(imp); | |
15831 | else if (c == '"') | |
15832 | return String_expression::do_import(imp); | |
15833 | else if (c == '-' || (c >= '0' && c <= '9')) | |
15834 | { | |
15835 | // This handles integers, floats and complex constants. | |
15836 | return Integer_expression::do_import(imp); | |
15837 | } | |
15838 | else if (imp->match_c_string("nil")) | |
15839 | return Nil_expression::do_import(imp); | |
15840 | else if (imp->match_c_string("convert")) | |
15841 | return Type_conversion_expression::do_import(imp); | |
15842 | else | |
15843 | { | |
631d5788 | 15844 | go_error_at(imp->location(), "import error: expected expression"); |
e440a328 | 15845 | return Expression::make_error(imp->location()); |
15846 | } | |
15847 | } | |
15848 | ||
15849 | // Class Expression_list. | |
15850 | ||
15851 | // Traverse the list. | |
15852 | ||
15853 | int | |
15854 | Expression_list::traverse(Traverse* traverse) | |
15855 | { | |
15856 | for (Expression_list::iterator p = this->begin(); | |
15857 | p != this->end(); | |
15858 | ++p) | |
15859 | { | |
15860 | if (*p != NULL) | |
15861 | { | |
15862 | if (Expression::traverse(&*p, traverse) == TRAVERSE_EXIT) | |
15863 | return TRAVERSE_EXIT; | |
15864 | } | |
15865 | } | |
15866 | return TRAVERSE_CONTINUE; | |
15867 | } | |
15868 | ||
15869 | // Copy the list. | |
15870 | ||
15871 | Expression_list* | |
15872 | Expression_list::copy() | |
15873 | { | |
15874 | Expression_list* ret = new Expression_list(); | |
15875 | for (Expression_list::iterator p = this->begin(); | |
15876 | p != this->end(); | |
15877 | ++p) | |
15878 | { | |
15879 | if (*p == NULL) | |
15880 | ret->push_back(NULL); | |
15881 | else | |
15882 | ret->push_back((*p)->copy()); | |
15883 | } | |
15884 | return ret; | |
15885 | } | |
15886 | ||
15887 | // Return whether an expression list has an error expression. | |
15888 | ||
15889 | bool | |
15890 | Expression_list::contains_error() const | |
15891 | { | |
15892 | for (Expression_list::const_iterator p = this->begin(); | |
15893 | p != this->end(); | |
15894 | ++p) | |
15895 | if (*p != NULL && (*p)->is_error_expression()) | |
15896 | return true; | |
15897 | return false; | |
15898 | } | |
0c77715b | 15899 | |
15900 | // Class Numeric_constant. | |
15901 | ||
15902 | // Destructor. | |
15903 | ||
15904 | Numeric_constant::~Numeric_constant() | |
15905 | { | |
15906 | this->clear(); | |
15907 | } | |
15908 | ||
15909 | // Copy constructor. | |
15910 | ||
15911 | Numeric_constant::Numeric_constant(const Numeric_constant& a) | |
15912 | : classification_(a.classification_), type_(a.type_) | |
15913 | { | |
15914 | switch (a.classification_) | |
15915 | { | |
15916 | case NC_INVALID: | |
15917 | break; | |
15918 | case NC_INT: | |
15919 | case NC_RUNE: | |
15920 | mpz_init_set(this->u_.int_val, a.u_.int_val); | |
15921 | break; | |
15922 | case NC_FLOAT: | |
15923 | mpfr_init_set(this->u_.float_val, a.u_.float_val, GMP_RNDN); | |
15924 | break; | |
15925 | case NC_COMPLEX: | |
fcbea5e4 | 15926 | mpc_init2(this->u_.complex_val, mpc_precision); |
15927 | mpc_set(this->u_.complex_val, a.u_.complex_val, MPC_RNDNN); | |
0c77715b | 15928 | break; |
15929 | default: | |
15930 | go_unreachable(); | |
15931 | } | |
15932 | } | |
15933 | ||
15934 | // Assignment operator. | |
15935 | ||
15936 | Numeric_constant& | |
15937 | Numeric_constant::operator=(const Numeric_constant& a) | |
15938 | { | |
15939 | this->clear(); | |
15940 | this->classification_ = a.classification_; | |
15941 | this->type_ = a.type_; | |
15942 | switch (a.classification_) | |
15943 | { | |
15944 | case NC_INVALID: | |
15945 | break; | |
15946 | case NC_INT: | |
15947 | case NC_RUNE: | |
15948 | mpz_init_set(this->u_.int_val, a.u_.int_val); | |
15949 | break; | |
15950 | case NC_FLOAT: | |
15951 | mpfr_init_set(this->u_.float_val, a.u_.float_val, GMP_RNDN); | |
15952 | break; | |
15953 | case NC_COMPLEX: | |
fcbea5e4 | 15954 | mpc_init2(this->u_.complex_val, mpc_precision); |
15955 | mpc_set(this->u_.complex_val, a.u_.complex_val, MPC_RNDNN); | |
0c77715b | 15956 | break; |
15957 | default: | |
15958 | go_unreachable(); | |
15959 | } | |
15960 | return *this; | |
15961 | } | |
15962 | ||
15963 | // Clear the contents. | |
15964 | ||
15965 | void | |
15966 | Numeric_constant::clear() | |
15967 | { | |
15968 | switch (this->classification_) | |
15969 | { | |
15970 | case NC_INVALID: | |
15971 | break; | |
15972 | case NC_INT: | |
15973 | case NC_RUNE: | |
15974 | mpz_clear(this->u_.int_val); | |
15975 | break; | |
15976 | case NC_FLOAT: | |
15977 | mpfr_clear(this->u_.float_val); | |
15978 | break; | |
15979 | case NC_COMPLEX: | |
fcbea5e4 | 15980 | mpc_clear(this->u_.complex_val); |
0c77715b | 15981 | break; |
15982 | default: | |
15983 | go_unreachable(); | |
15984 | } | |
15985 | this->classification_ = NC_INVALID; | |
15986 | } | |
15987 | ||
15988 | // Set to an unsigned long value. | |
15989 | ||
15990 | void | |
15991 | Numeric_constant::set_unsigned_long(Type* type, unsigned long val) | |
15992 | { | |
15993 | this->clear(); | |
15994 | this->classification_ = NC_INT; | |
15995 | this->type_ = type; | |
15996 | mpz_init_set_ui(this->u_.int_val, val); | |
15997 | } | |
15998 | ||
15999 | // Set to an integer value. | |
16000 | ||
16001 | void | |
16002 | Numeric_constant::set_int(Type* type, const mpz_t val) | |
16003 | { | |
16004 | this->clear(); | |
16005 | this->classification_ = NC_INT; | |
16006 | this->type_ = type; | |
16007 | mpz_init_set(this->u_.int_val, val); | |
16008 | } | |
16009 | ||
16010 | // Set to a rune value. | |
16011 | ||
16012 | void | |
16013 | Numeric_constant::set_rune(Type* type, const mpz_t val) | |
16014 | { | |
16015 | this->clear(); | |
16016 | this->classification_ = NC_RUNE; | |
16017 | this->type_ = type; | |
16018 | mpz_init_set(this->u_.int_val, val); | |
16019 | } | |
16020 | ||
16021 | // Set to a floating point value. | |
16022 | ||
16023 | void | |
16024 | Numeric_constant::set_float(Type* type, const mpfr_t val) | |
16025 | { | |
16026 | this->clear(); | |
16027 | this->classification_ = NC_FLOAT; | |
16028 | this->type_ = type; | |
833b523c | 16029 | // Numeric constants do not have negative zero values, so remove |
16030 | // them here. They also don't have infinity or NaN values, but we | |
16031 | // should never see them here. | |
16032 | if (mpfr_zero_p(val)) | |
16033 | mpfr_init_set_ui(this->u_.float_val, 0, GMP_RNDN); | |
16034 | else | |
16035 | mpfr_init_set(this->u_.float_val, val, GMP_RNDN); | |
0c77715b | 16036 | } |
16037 | ||
16038 | // Set to a complex value. | |
16039 | ||
16040 | void | |
fcbea5e4 | 16041 | Numeric_constant::set_complex(Type* type, const mpc_t val) |
0c77715b | 16042 | { |
16043 | this->clear(); | |
16044 | this->classification_ = NC_COMPLEX; | |
16045 | this->type_ = type; | |
fcbea5e4 | 16046 | mpc_init2(this->u_.complex_val, mpc_precision); |
16047 | mpc_set(this->u_.complex_val, val, MPC_RNDNN); | |
0c77715b | 16048 | } |
16049 | ||
16050 | // Get an int value. | |
16051 | ||
16052 | void | |
16053 | Numeric_constant::get_int(mpz_t* val) const | |
16054 | { | |
16055 | go_assert(this->is_int()); | |
16056 | mpz_init_set(*val, this->u_.int_val); | |
16057 | } | |
16058 | ||
16059 | // Get a rune value. | |
16060 | ||
16061 | void | |
16062 | Numeric_constant::get_rune(mpz_t* val) const | |
16063 | { | |
16064 | go_assert(this->is_rune()); | |
16065 | mpz_init_set(*val, this->u_.int_val); | |
16066 | } | |
16067 | ||
16068 | // Get a floating point value. | |
16069 | ||
16070 | void | |
16071 | Numeric_constant::get_float(mpfr_t* val) const | |
16072 | { | |
16073 | go_assert(this->is_float()); | |
16074 | mpfr_init_set(*val, this->u_.float_val, GMP_RNDN); | |
16075 | } | |
16076 | ||
16077 | // Get a complex value. | |
16078 | ||
16079 | void | |
fcbea5e4 | 16080 | Numeric_constant::get_complex(mpc_t* val) const |
0c77715b | 16081 | { |
16082 | go_assert(this->is_complex()); | |
fcbea5e4 | 16083 | mpc_init2(*val, mpc_precision); |
16084 | mpc_set(*val, this->u_.complex_val, MPC_RNDNN); | |
0c77715b | 16085 | } |
16086 | ||
16087 | // Express value as unsigned long if possible. | |
16088 | ||
16089 | Numeric_constant::To_unsigned_long | |
16090 | Numeric_constant::to_unsigned_long(unsigned long* val) const | |
16091 | { | |
16092 | switch (this->classification_) | |
16093 | { | |
16094 | case NC_INT: | |
16095 | case NC_RUNE: | |
16096 | return this->mpz_to_unsigned_long(this->u_.int_val, val); | |
16097 | case NC_FLOAT: | |
16098 | return this->mpfr_to_unsigned_long(this->u_.float_val, val); | |
16099 | case NC_COMPLEX: | |
fcbea5e4 | 16100 | if (!mpfr_zero_p(mpc_imagref(this->u_.complex_val))) |
0c77715b | 16101 | return NC_UL_NOTINT; |
fcbea5e4 | 16102 | return this->mpfr_to_unsigned_long(mpc_realref(this->u_.complex_val), |
16103 | val); | |
0c77715b | 16104 | default: |
16105 | go_unreachable(); | |
16106 | } | |
16107 | } | |
16108 | ||
16109 | // Express integer value as unsigned long if possible. | |
16110 | ||
16111 | Numeric_constant::To_unsigned_long | |
16112 | Numeric_constant::mpz_to_unsigned_long(const mpz_t ival, | |
16113 | unsigned long *val) const | |
16114 | { | |
16115 | if (mpz_sgn(ival) < 0) | |
16116 | return NC_UL_NEGATIVE; | |
16117 | unsigned long ui = mpz_get_ui(ival); | |
16118 | if (mpz_cmp_ui(ival, ui) != 0) | |
16119 | return NC_UL_BIG; | |
16120 | *val = ui; | |
16121 | return NC_UL_VALID; | |
16122 | } | |
16123 | ||
16124 | // Express floating point value as unsigned long if possible. | |
16125 | ||
16126 | Numeric_constant::To_unsigned_long | |
16127 | Numeric_constant::mpfr_to_unsigned_long(const mpfr_t fval, | |
16128 | unsigned long *val) const | |
16129 | { | |
16130 | if (!mpfr_integer_p(fval)) | |
16131 | return NC_UL_NOTINT; | |
16132 | mpz_t ival; | |
16133 | mpz_init(ival); | |
16134 | mpfr_get_z(ival, fval, GMP_RNDN); | |
16135 | To_unsigned_long ret = this->mpz_to_unsigned_long(ival, val); | |
16136 | mpz_clear(ival); | |
16137 | return ret; | |
16138 | } | |
16139 | ||
03118c21 | 16140 | // Express value as memory size if possible. |
16141 | ||
16142 | bool | |
16143 | Numeric_constant::to_memory_size(int64_t* val) const | |
16144 | { | |
16145 | switch (this->classification_) | |
16146 | { | |
16147 | case NC_INT: | |
16148 | case NC_RUNE: | |
16149 | return this->mpz_to_memory_size(this->u_.int_val, val); | |
16150 | case NC_FLOAT: | |
16151 | return this->mpfr_to_memory_size(this->u_.float_val, val); | |
16152 | case NC_COMPLEX: | |
16153 | if (!mpfr_zero_p(mpc_imagref(this->u_.complex_val))) | |
16154 | return false; | |
16155 | return this->mpfr_to_memory_size(mpc_realref(this->u_.complex_val), val); | |
16156 | default: | |
16157 | go_unreachable(); | |
16158 | } | |
16159 | } | |
16160 | ||
16161 | // Express integer as memory size if possible. | |
16162 | ||
16163 | bool | |
16164 | Numeric_constant::mpz_to_memory_size(const mpz_t ival, int64_t* val) const | |
16165 | { | |
16166 | if (mpz_sgn(ival) < 0) | |
16167 | return false; | |
16168 | if (mpz_fits_slong_p(ival)) | |
16169 | { | |
16170 | *val = static_cast<int64_t>(mpz_get_si(ival)); | |
16171 | return true; | |
16172 | } | |
16173 | ||
16174 | // Test >= 64, not > 64, because an int64_t can hold 63 bits of a | |
16175 | // positive value. | |
16176 | if (mpz_sizeinbase(ival, 2) >= 64) | |
16177 | return false; | |
16178 | ||
16179 | mpz_t q, r; | |
16180 | mpz_init(q); | |
16181 | mpz_init(r); | |
16182 | mpz_tdiv_q_2exp(q, ival, 32); | |
16183 | mpz_tdiv_r_2exp(r, ival, 32); | |
16184 | go_assert(mpz_fits_ulong_p(q) && mpz_fits_ulong_p(r)); | |
16185 | *val = ((static_cast<int64_t>(mpz_get_ui(q)) << 32) | |
16186 | + static_cast<int64_t>(mpz_get_ui(r))); | |
16187 | mpz_clear(r); | |
16188 | mpz_clear(q); | |
16189 | return true; | |
16190 | } | |
16191 | ||
16192 | // Express floating point value as memory size if possible. | |
16193 | ||
16194 | bool | |
16195 | Numeric_constant::mpfr_to_memory_size(const mpfr_t fval, int64_t* val) const | |
16196 | { | |
16197 | if (!mpfr_integer_p(fval)) | |
16198 | return false; | |
16199 | mpz_t ival; | |
16200 | mpz_init(ival); | |
16201 | mpfr_get_z(ival, fval, GMP_RNDN); | |
16202 | bool ret = this->mpz_to_memory_size(ival, val); | |
16203 | mpz_clear(ival); | |
16204 | return ret; | |
16205 | } | |
16206 | ||
0c77715b | 16207 | // Convert value to integer if possible. |
16208 | ||
16209 | bool | |
16210 | Numeric_constant::to_int(mpz_t* val) const | |
16211 | { | |
16212 | switch (this->classification_) | |
16213 | { | |
16214 | case NC_INT: | |
16215 | case NC_RUNE: | |
16216 | mpz_init_set(*val, this->u_.int_val); | |
16217 | return true; | |
16218 | case NC_FLOAT: | |
16219 | if (!mpfr_integer_p(this->u_.float_val)) | |
16220 | return false; | |
16221 | mpz_init(*val); | |
16222 | mpfr_get_z(*val, this->u_.float_val, GMP_RNDN); | |
16223 | return true; | |
16224 | case NC_COMPLEX: | |
fcbea5e4 | 16225 | if (!mpfr_zero_p(mpc_imagref(this->u_.complex_val)) |
16226 | || !mpfr_integer_p(mpc_realref(this->u_.complex_val))) | |
0c77715b | 16227 | return false; |
16228 | mpz_init(*val); | |
fcbea5e4 | 16229 | mpfr_get_z(*val, mpc_realref(this->u_.complex_val), GMP_RNDN); |
0c77715b | 16230 | return true; |
16231 | default: | |
16232 | go_unreachable(); | |
16233 | } | |
16234 | } | |
16235 | ||
16236 | // Convert value to floating point if possible. | |
16237 | ||
16238 | bool | |
16239 | Numeric_constant::to_float(mpfr_t* val) const | |
16240 | { | |
16241 | switch (this->classification_) | |
16242 | { | |
16243 | case NC_INT: | |
16244 | case NC_RUNE: | |
16245 | mpfr_init_set_z(*val, this->u_.int_val, GMP_RNDN); | |
16246 | return true; | |
16247 | case NC_FLOAT: | |
16248 | mpfr_init_set(*val, this->u_.float_val, GMP_RNDN); | |
16249 | return true; | |
16250 | case NC_COMPLEX: | |
fcbea5e4 | 16251 | if (!mpfr_zero_p(mpc_imagref(this->u_.complex_val))) |
0c77715b | 16252 | return false; |
fcbea5e4 | 16253 | mpfr_init_set(*val, mpc_realref(this->u_.complex_val), GMP_RNDN); |
0c77715b | 16254 | return true; |
16255 | default: | |
16256 | go_unreachable(); | |
16257 | } | |
16258 | } | |
16259 | ||
16260 | // Convert value to complex. | |
16261 | ||
16262 | bool | |
fcbea5e4 | 16263 | Numeric_constant::to_complex(mpc_t* val) const |
0c77715b | 16264 | { |
fcbea5e4 | 16265 | mpc_init2(*val, mpc_precision); |
0c77715b | 16266 | switch (this->classification_) |
16267 | { | |
16268 | case NC_INT: | |
16269 | case NC_RUNE: | |
fcbea5e4 | 16270 | mpc_set_z(*val, this->u_.int_val, MPC_RNDNN); |
0c77715b | 16271 | return true; |
16272 | case NC_FLOAT: | |
fcbea5e4 | 16273 | mpc_set_fr(*val, this->u_.float_val, MPC_RNDNN); |
0c77715b | 16274 | return true; |
16275 | case NC_COMPLEX: | |
fcbea5e4 | 16276 | mpc_set(*val, this->u_.complex_val, MPC_RNDNN); |
0c77715b | 16277 | return true; |
16278 | default: | |
16279 | go_unreachable(); | |
16280 | } | |
16281 | } | |
16282 | ||
16283 | // Get the type. | |
16284 | ||
16285 | Type* | |
16286 | Numeric_constant::type() const | |
16287 | { | |
16288 | if (this->type_ != NULL) | |
16289 | return this->type_; | |
16290 | switch (this->classification_) | |
16291 | { | |
16292 | case NC_INT: | |
16293 | return Type::make_abstract_integer_type(); | |
16294 | case NC_RUNE: | |
16295 | return Type::make_abstract_character_type(); | |
16296 | case NC_FLOAT: | |
16297 | return Type::make_abstract_float_type(); | |
16298 | case NC_COMPLEX: | |
16299 | return Type::make_abstract_complex_type(); | |
16300 | default: | |
16301 | go_unreachable(); | |
16302 | } | |
16303 | } | |
16304 | ||
16305 | // If the constant can be expressed in TYPE, then set the type of the | |
16306 | // constant to TYPE and return true. Otherwise return false, and, if | |
16307 | // ISSUE_ERROR is true, report an appropriate error message. | |
16308 | ||
16309 | bool | |
16310 | Numeric_constant::set_type(Type* type, bool issue_error, Location loc) | |
16311 | { | |
16312 | bool ret; | |
f11c2155 | 16313 | if (type == NULL || type->is_error()) |
0c77715b | 16314 | ret = true; |
16315 | else if (type->integer_type() != NULL) | |
16316 | ret = this->check_int_type(type->integer_type(), issue_error, loc); | |
16317 | else if (type->float_type() != NULL) | |
16318 | ret = this->check_float_type(type->float_type(), issue_error, loc); | |
16319 | else if (type->complex_type() != NULL) | |
16320 | ret = this->check_complex_type(type->complex_type(), issue_error, loc); | |
16321 | else | |
5706ab68 | 16322 | { |
16323 | ret = false; | |
16324 | if (issue_error) | |
16325 | go_assert(saw_errors()); | |
16326 | } | |
0c77715b | 16327 | if (ret) |
16328 | this->type_ = type; | |
16329 | return ret; | |
16330 | } | |
16331 | ||
16332 | // Check whether the constant can be expressed in an integer type. | |
16333 | ||
16334 | bool | |
16335 | Numeric_constant::check_int_type(Integer_type* type, bool issue_error, | |
71a45216 | 16336 | Location location) |
0c77715b | 16337 | { |
16338 | mpz_t val; | |
16339 | switch (this->classification_) | |
16340 | { | |
16341 | case NC_INT: | |
16342 | case NC_RUNE: | |
16343 | mpz_init_set(val, this->u_.int_val); | |
16344 | break; | |
16345 | ||
16346 | case NC_FLOAT: | |
16347 | if (!mpfr_integer_p(this->u_.float_val)) | |
16348 | { | |
16349 | if (issue_error) | |
71a45216 | 16350 | { |
631d5788 | 16351 | go_error_at(location, |
16352 | "floating point constant truncated to integer"); | |
71a45216 | 16353 | this->set_invalid(); |
16354 | } | |
0c77715b | 16355 | return false; |
16356 | } | |
16357 | mpz_init(val); | |
16358 | mpfr_get_z(val, this->u_.float_val, GMP_RNDN); | |
16359 | break; | |
16360 | ||
16361 | case NC_COMPLEX: | |
fcbea5e4 | 16362 | if (!mpfr_integer_p(mpc_realref(this->u_.complex_val)) |
16363 | || !mpfr_zero_p(mpc_imagref(this->u_.complex_val))) | |
0c77715b | 16364 | { |
16365 | if (issue_error) | |
71a45216 | 16366 | { |
631d5788 | 16367 | go_error_at(location, "complex constant truncated to integer"); |
71a45216 | 16368 | this->set_invalid(); |
16369 | } | |
0c77715b | 16370 | return false; |
16371 | } | |
16372 | mpz_init(val); | |
fcbea5e4 | 16373 | mpfr_get_z(val, mpc_realref(this->u_.complex_val), GMP_RNDN); |
0c77715b | 16374 | break; |
16375 | ||
16376 | default: | |
16377 | go_unreachable(); | |
16378 | } | |
16379 | ||
16380 | bool ret; | |
16381 | if (type->is_abstract()) | |
16382 | ret = true; | |
16383 | else | |
16384 | { | |
16385 | int bits = mpz_sizeinbase(val, 2); | |
16386 | if (type->is_unsigned()) | |
16387 | { | |
16388 | // For an unsigned type we can only accept a nonnegative | |
16389 | // number, and we must be able to represents at least BITS. | |
16390 | ret = mpz_sgn(val) >= 0 && bits <= type->bits(); | |
16391 | } | |
16392 | else | |
16393 | { | |
16394 | // For a signed type we need an extra bit to indicate the | |
16395 | // sign. We have to handle the most negative integer | |
16396 | // specially. | |
16397 | ret = (bits + 1 <= type->bits() | |
16398 | || (bits <= type->bits() | |
16399 | && mpz_sgn(val) < 0 | |
16400 | && (mpz_scan1(val, 0) | |
16401 | == static_cast<unsigned long>(type->bits() - 1)) | |
16402 | && mpz_scan0(val, type->bits()) == ULONG_MAX)); | |
16403 | } | |
16404 | } | |
16405 | ||
16406 | if (!ret && issue_error) | |
71a45216 | 16407 | { |
631d5788 | 16408 | go_error_at(location, "integer constant overflow"); |
71a45216 | 16409 | this->set_invalid(); |
16410 | } | |
0c77715b | 16411 | |
16412 | return ret; | |
16413 | } | |
16414 | ||
16415 | // Check whether the constant can be expressed in a floating point | |
16416 | // type. | |
16417 | ||
16418 | bool | |
16419 | Numeric_constant::check_float_type(Float_type* type, bool issue_error, | |
d0bcce51 | 16420 | Location location) |
0c77715b | 16421 | { |
16422 | mpfr_t val; | |
16423 | switch (this->classification_) | |
16424 | { | |
16425 | case NC_INT: | |
16426 | case NC_RUNE: | |
16427 | mpfr_init_set_z(val, this->u_.int_val, GMP_RNDN); | |
16428 | break; | |
16429 | ||
16430 | case NC_FLOAT: | |
16431 | mpfr_init_set(val, this->u_.float_val, GMP_RNDN); | |
16432 | break; | |
16433 | ||
16434 | case NC_COMPLEX: | |
fcbea5e4 | 16435 | if (!mpfr_zero_p(mpc_imagref(this->u_.complex_val))) |
0c77715b | 16436 | { |
16437 | if (issue_error) | |
71a45216 | 16438 | { |
16439 | this->set_invalid(); | |
631d5788 | 16440 | go_error_at(location, "complex constant truncated to float"); |
71a45216 | 16441 | } |
0c77715b | 16442 | return false; |
16443 | } | |
fcbea5e4 | 16444 | mpfr_init_set(val, mpc_realref(this->u_.complex_val), GMP_RNDN); |
0c77715b | 16445 | break; |
16446 | ||
16447 | default: | |
16448 | go_unreachable(); | |
16449 | } | |
16450 | ||
16451 | bool ret; | |
16452 | if (type->is_abstract()) | |
16453 | ret = true; | |
16454 | else if (mpfr_nan_p(val) || mpfr_inf_p(val) || mpfr_zero_p(val)) | |
16455 | { | |
16456 | // A NaN or Infinity always fits in the range of the type. | |
16457 | ret = true; | |
16458 | } | |
16459 | else | |
16460 | { | |
16461 | mp_exp_t exp = mpfr_get_exp(val); | |
16462 | mp_exp_t max_exp; | |
16463 | switch (type->bits()) | |
16464 | { | |
16465 | case 32: | |
16466 | max_exp = 128; | |
16467 | break; | |
16468 | case 64: | |
16469 | max_exp = 1024; | |
16470 | break; | |
16471 | default: | |
16472 | go_unreachable(); | |
16473 | } | |
16474 | ||
16475 | ret = exp <= max_exp; | |
d0bcce51 | 16476 | |
16477 | if (ret) | |
16478 | { | |
16479 | // Round the constant to the desired type. | |
16480 | mpfr_t t; | |
16481 | mpfr_init(t); | |
16482 | switch (type->bits()) | |
16483 | { | |
16484 | case 32: | |
16485 | mpfr_set_prec(t, 24); | |
16486 | break; | |
16487 | case 64: | |
16488 | mpfr_set_prec(t, 53); | |
16489 | break; | |
16490 | default: | |
16491 | go_unreachable(); | |
16492 | } | |
16493 | mpfr_set(t, val, GMP_RNDN); | |
16494 | mpfr_set(val, t, GMP_RNDN); | |
16495 | mpfr_clear(t); | |
16496 | ||
16497 | this->set_float(type, val); | |
16498 | } | |
0c77715b | 16499 | } |
16500 | ||
16501 | mpfr_clear(val); | |
16502 | ||
16503 | if (!ret && issue_error) | |
71a45216 | 16504 | { |
631d5788 | 16505 | go_error_at(location, "floating point constant overflow"); |
71a45216 | 16506 | this->set_invalid(); |
16507 | } | |
0c77715b | 16508 | |
16509 | return ret; | |
16510 | } | |
16511 | ||
16512 | // Check whether the constant can be expressed in a complex type. | |
16513 | ||
16514 | bool | |
16515 | Numeric_constant::check_complex_type(Complex_type* type, bool issue_error, | |
d0bcce51 | 16516 | Location location) |
0c77715b | 16517 | { |
16518 | if (type->is_abstract()) | |
16519 | return true; | |
16520 | ||
16521 | mp_exp_t max_exp; | |
16522 | switch (type->bits()) | |
16523 | { | |
16524 | case 64: | |
16525 | max_exp = 128; | |
16526 | break; | |
16527 | case 128: | |
16528 | max_exp = 1024; | |
16529 | break; | |
16530 | default: | |
16531 | go_unreachable(); | |
16532 | } | |
16533 | ||
fcbea5e4 | 16534 | mpc_t val; |
16535 | mpc_init2(val, mpc_precision); | |
0c77715b | 16536 | switch (this->classification_) |
16537 | { | |
16538 | case NC_INT: | |
16539 | case NC_RUNE: | |
fcbea5e4 | 16540 | mpc_set_z(val, this->u_.int_val, MPC_RNDNN); |
0c77715b | 16541 | break; |
16542 | ||
16543 | case NC_FLOAT: | |
fcbea5e4 | 16544 | mpc_set_fr(val, this->u_.float_val, MPC_RNDNN); |
0c77715b | 16545 | break; |
16546 | ||
16547 | case NC_COMPLEX: | |
fcbea5e4 | 16548 | mpc_set(val, this->u_.complex_val, MPC_RNDNN); |
0c77715b | 16549 | break; |
16550 | ||
16551 | default: | |
16552 | go_unreachable(); | |
16553 | } | |
16554 | ||
d0bcce51 | 16555 | bool ret = true; |
fcbea5e4 | 16556 | if (!mpfr_nan_p(mpc_realref(val)) |
16557 | && !mpfr_inf_p(mpc_realref(val)) | |
16558 | && !mpfr_zero_p(mpc_realref(val)) | |
16559 | && mpfr_get_exp(mpc_realref(val)) > max_exp) | |
d0bcce51 | 16560 | { |
16561 | if (issue_error) | |
71a45216 | 16562 | { |
631d5788 | 16563 | go_error_at(location, "complex real part overflow"); |
71a45216 | 16564 | this->set_invalid(); |
16565 | } | |
d0bcce51 | 16566 | ret = false; |
16567 | } | |
0c77715b | 16568 | |
fcbea5e4 | 16569 | if (!mpfr_nan_p(mpc_imagref(val)) |
16570 | && !mpfr_inf_p(mpc_imagref(val)) | |
16571 | && !mpfr_zero_p(mpc_imagref(val)) | |
16572 | && mpfr_get_exp(mpc_imagref(val)) > max_exp) | |
d0bcce51 | 16573 | { |
16574 | if (issue_error) | |
71a45216 | 16575 | { |
631d5788 | 16576 | go_error_at(location, "complex imaginary part overflow"); |
71a45216 | 16577 | this->set_invalid(); |
16578 | } | |
d0bcce51 | 16579 | ret = false; |
16580 | } | |
0c77715b | 16581 | |
d0bcce51 | 16582 | if (ret) |
16583 | { | |
16584 | // Round the constant to the desired type. | |
fcbea5e4 | 16585 | mpc_t t; |
d0bcce51 | 16586 | switch (type->bits()) |
16587 | { | |
16588 | case 64: | |
fcbea5e4 | 16589 | mpc_init2(t, 24); |
d0bcce51 | 16590 | break; |
16591 | case 128: | |
fcbea5e4 | 16592 | mpc_init2(t, 53); |
d0bcce51 | 16593 | break; |
16594 | default: | |
16595 | go_unreachable(); | |
16596 | } | |
fcbea5e4 | 16597 | mpc_set(t, val, MPC_RNDNN); |
16598 | mpc_set(val, t, MPC_RNDNN); | |
16599 | mpc_clear(t); | |
d0bcce51 | 16600 | |
fcbea5e4 | 16601 | this->set_complex(type, val); |
d0bcce51 | 16602 | } |
16603 | ||
fcbea5e4 | 16604 | mpc_clear(val); |
0c77715b | 16605 | |
16606 | return ret; | |
16607 | } | |
16608 | ||
16609 | // Return an Expression for this value. | |
16610 | ||
16611 | Expression* | |
16612 | Numeric_constant::expression(Location loc) const | |
16613 | { | |
16614 | switch (this->classification_) | |
16615 | { | |
16616 | case NC_INT: | |
e67508fa | 16617 | return Expression::make_integer_z(&this->u_.int_val, this->type_, loc); |
0c77715b | 16618 | case NC_RUNE: |
16619 | return Expression::make_character(&this->u_.int_val, this->type_, loc); | |
16620 | case NC_FLOAT: | |
16621 | return Expression::make_float(&this->u_.float_val, this->type_, loc); | |
16622 | case NC_COMPLEX: | |
fcbea5e4 | 16623 | return Expression::make_complex(&this->u_.complex_val, this->type_, loc); |
71a45216 | 16624 | case NC_INVALID: |
16625 | go_assert(saw_errors()); | |
16626 | return Expression::make_error(loc); | |
0c77715b | 16627 | default: |
16628 | go_unreachable(); | |
16629 | } | |
16630 | } |