1 // expressions.cc -- Go frontend expression handling.
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.
11 #ifndef ENABLE_BUILD_WITH_CXX
20 #include "tree-iterator.h"
25 #ifndef ENABLE_BUILD_WITH_CXX
34 #include "statements.h"
36 #include "expressions.h"
40 Expression::Expression(Expression_classification classification,
41 source_location location)
42 : classification_(classification), location_(location)
46 Expression::~Expression()
50 // If this expression has a constant integer value, return it.
53 Expression::integer_constant_value(bool iota_is_constant, mpz_t val,
57 return this->do_integer_constant_value(iota_is_constant, val, ptype);
60 // If this expression has a constant floating point value, return it.
63 Expression::float_constant_value(mpfr_t val, Type** ptype) const
66 if (this->do_float_constant_value(val, ptype))
72 if (!this->do_integer_constant_value(false, ival, &t))
76 mpfr_set_z(val, ival, GMP_RNDN);
83 // If this expression has a constant complex value, return it.
86 Expression::complex_constant_value(mpfr_t real, mpfr_t imag,
90 if (this->do_complex_constant_value(real, imag, ptype))
93 if (this->float_constant_value(real, &t))
95 mpfr_set_ui(imag, 0, GMP_RNDN);
101 // Traverse the expressions.
104 Expression::traverse(Expression** pexpr, Traverse* traverse)
106 Expression* expr = *pexpr;
107 if ((traverse->traverse_mask() & Traverse::traverse_expressions) != 0)
109 int t = traverse->expression(pexpr);
110 if (t == TRAVERSE_EXIT)
111 return TRAVERSE_EXIT;
112 else if (t == TRAVERSE_SKIP_COMPONENTS)
113 return TRAVERSE_CONTINUE;
115 return expr->do_traverse(traverse);
118 // Traverse subexpressions of this expression.
121 Expression::traverse_subexpressions(Traverse* traverse)
123 return this->do_traverse(traverse);
126 // Default implementation for do_traverse for child classes.
129 Expression::do_traverse(Traverse*)
131 return TRAVERSE_CONTINUE;
134 // This virtual function is called by the parser if the value of this
135 // expression is being discarded. By default, we warn. Expressions
136 // with side effects override.
139 Expression::do_discarding_value()
141 this->warn_about_unused_value();
144 // This virtual function is called to export expressions. This will
145 // only be used by expressions which may be constant.
148 Expression::do_export(Export*) const
153 // Warn that the value of the expression is not used.
156 Expression::warn_about_unused_value()
158 warning_at(this->location(), OPT_Wunused_value, "value computed is not used");
161 // Note that this expression is an error. This is called by children
162 // when they discover an error.
165 Expression::set_is_error()
167 this->classification_ = EXPRESSION_ERROR;
170 // For children to call to report an error conveniently.
173 Expression::report_error(const char* msg)
175 error_at(this->location_, "%s", msg);
176 this->set_is_error();
179 // Set types of variables and constants. This is implemented by the
183 Expression::determine_type(const Type_context* context)
185 this->do_determine_type(context);
188 // Set types when there is no context.
191 Expression::determine_type_no_context()
193 Type_context context;
194 this->do_determine_type(&context);
197 // Return a tree handling any conversions which must be done during
201 Expression::convert_for_assignment(Translate_context* context, Type* lhs_type,
202 Type* rhs_type, tree rhs_tree,
203 source_location location)
205 if (lhs_type == rhs_type)
208 if (lhs_type->is_error_type() || rhs_type->is_error_type())
209 return error_mark_node;
211 if (lhs_type->is_undefined() || rhs_type->is_undefined())
213 // Make sure we report the error.
216 return error_mark_node;
219 if (rhs_tree == error_mark_node || TREE_TYPE(rhs_tree) == error_mark_node)
220 return error_mark_node;
222 Gogo* gogo = context->gogo();
224 tree lhs_type_tree = lhs_type->get_tree(gogo);
225 if (lhs_type_tree == error_mark_node)
226 return error_mark_node;
228 if (lhs_type->interface_type() != NULL)
230 if (rhs_type->interface_type() == NULL)
231 return Expression::convert_type_to_interface(context, lhs_type,
235 return Expression::convert_interface_to_interface(context, lhs_type,
239 else if (rhs_type->interface_type() != NULL)
240 return Expression::convert_interface_to_type(context, lhs_type, rhs_type,
242 else if (lhs_type->is_open_array_type()
243 && rhs_type->is_nil_type())
245 // Assigning nil to an open array.
246 gcc_assert(TREE_CODE(lhs_type_tree) == RECORD_TYPE);
248 VEC(constructor_elt,gc)* init = VEC_alloc(constructor_elt, gc, 3);
250 constructor_elt* elt = VEC_quick_push(constructor_elt, init, NULL);
251 tree field = TYPE_FIELDS(lhs_type_tree);
252 gcc_assert(strcmp(IDENTIFIER_POINTER(DECL_NAME(field)),
255 elt->value = fold_convert(TREE_TYPE(field), null_pointer_node);
257 elt = VEC_quick_push(constructor_elt, init, NULL);
258 field = DECL_CHAIN(field);
259 gcc_assert(strcmp(IDENTIFIER_POINTER(DECL_NAME(field)),
262 elt->value = fold_convert(TREE_TYPE(field), integer_zero_node);
264 elt = VEC_quick_push(constructor_elt, init, NULL);
265 field = DECL_CHAIN(field);
266 gcc_assert(strcmp(IDENTIFIER_POINTER(DECL_NAME(field)),
269 elt->value = fold_convert(TREE_TYPE(field), integer_zero_node);
271 tree val = build_constructor(lhs_type_tree, init);
272 TREE_CONSTANT(val) = 1;
276 else if (rhs_type->is_nil_type())
278 // The left hand side should be a pointer type at the tree
280 gcc_assert(POINTER_TYPE_P(lhs_type_tree));
281 return fold_convert(lhs_type_tree, null_pointer_node);
283 else if (lhs_type_tree == TREE_TYPE(rhs_tree))
285 // No conversion is needed.
288 else if (POINTER_TYPE_P(lhs_type_tree)
289 || INTEGRAL_TYPE_P(lhs_type_tree)
290 || SCALAR_FLOAT_TYPE_P(lhs_type_tree)
291 || COMPLEX_FLOAT_TYPE_P(lhs_type_tree))
292 return fold_convert_loc(location, lhs_type_tree, rhs_tree);
293 else if (TREE_CODE(lhs_type_tree) == RECORD_TYPE
294 && TREE_CODE(TREE_TYPE(rhs_tree)) == RECORD_TYPE)
296 // This conversion must be permitted by Go, or we wouldn't have
298 gcc_assert(int_size_in_bytes(lhs_type_tree)
299 == int_size_in_bytes(TREE_TYPE(rhs_tree)));
300 return fold_build1_loc(location, VIEW_CONVERT_EXPR, lhs_type_tree,
305 gcc_assert(useless_type_conversion_p(lhs_type_tree, TREE_TYPE(rhs_tree)));
310 // Return a tree for a conversion from a non-interface type to an
314 Expression::convert_type_to_interface(Translate_context* context,
315 Type* lhs_type, Type* rhs_type,
316 tree rhs_tree, source_location location)
318 Gogo* gogo = context->gogo();
319 Interface_type* lhs_interface_type = lhs_type->interface_type();
320 bool lhs_is_empty = lhs_interface_type->is_empty();
322 // Since RHS_TYPE is a static type, we can create the interface
323 // method table at compile time.
325 // When setting an interface to nil, we just set both fields to
327 if (rhs_type->is_nil_type())
328 return lhs_type->get_init_tree(gogo, false);
330 // This should have been checked already.
331 gcc_assert(lhs_interface_type->implements_interface(rhs_type, NULL));
333 tree lhs_type_tree = lhs_type->get_tree(gogo);
334 if (lhs_type_tree == error_mark_node)
335 return error_mark_node;
337 // An interface is a tuple. If LHS_TYPE is an empty interface type,
338 // then the first field is the type descriptor for RHS_TYPE.
339 // Otherwise it is the interface method table for RHS_TYPE.
340 tree first_field_value;
342 first_field_value = rhs_type->type_descriptor_pointer(gogo);
345 // Build the interface method table for this interface and this
346 // object type: a list of function pointers for each interface
348 Named_type* rhs_named_type = rhs_type->named_type();
349 bool is_pointer = false;
350 if (rhs_named_type == NULL)
352 rhs_named_type = rhs_type->deref()->named_type();
356 if (rhs_named_type == NULL)
357 method_table = null_pointer_node;
360 rhs_named_type->interface_method_table(gogo, lhs_interface_type,
362 first_field_value = fold_convert_loc(location, const_ptr_type_node,
366 // Start building a constructor for the value we will return.
368 VEC(constructor_elt,gc)* init = VEC_alloc(constructor_elt, gc, 2);
370 constructor_elt* elt = VEC_quick_push(constructor_elt, init, NULL);
371 tree field = TYPE_FIELDS(lhs_type_tree);
372 gcc_assert(strcmp(IDENTIFIER_POINTER(DECL_NAME(field)),
373 (lhs_is_empty ? "__type_descriptor" : "__methods")) == 0);
375 elt->value = fold_convert_loc(location, TREE_TYPE(field), first_field_value);
377 elt = VEC_quick_push(constructor_elt, init, NULL);
378 field = DECL_CHAIN(field);
379 gcc_assert(strcmp(IDENTIFIER_POINTER(DECL_NAME(field)), "__object") == 0);
382 if (rhs_type->points_to() != NULL)
384 // We are assigning a pointer to the interface; the interface
385 // holds the pointer itself.
386 elt->value = rhs_tree;
387 return build_constructor(lhs_type_tree, init);
390 // We are assigning a non-pointer value to the interface; the
391 // interface gets a copy of the value in the heap.
393 tree object_size = TYPE_SIZE_UNIT(TREE_TYPE(rhs_tree));
395 tree space = gogo->allocate_memory(rhs_type, object_size, location);
396 space = fold_convert_loc(location, build_pointer_type(TREE_TYPE(rhs_tree)),
398 space = save_expr(space);
400 tree ref = build_fold_indirect_ref_loc(location, space);
401 TREE_THIS_NOTRAP(ref) = 1;
402 tree set = fold_build2_loc(location, MODIFY_EXPR, void_type_node,
405 elt->value = fold_convert_loc(location, TREE_TYPE(field), space);
407 return build2(COMPOUND_EXPR, lhs_type_tree, set,
408 build_constructor(lhs_type_tree, init));
411 // Return a tree for the type descriptor of RHS_TREE, which has
412 // interface type RHS_TYPE. If RHS_TREE is nil the result will be
416 Expression::get_interface_type_descriptor(Translate_context*,
417 Type* rhs_type, tree rhs_tree,
418 source_location location)
420 tree rhs_type_tree = TREE_TYPE(rhs_tree);
421 gcc_assert(TREE_CODE(rhs_type_tree) == RECORD_TYPE);
422 tree rhs_field = TYPE_FIELDS(rhs_type_tree);
423 tree v = build3(COMPONENT_REF, TREE_TYPE(rhs_field), rhs_tree, rhs_field,
425 if (rhs_type->interface_type()->is_empty())
427 gcc_assert(strcmp(IDENTIFIER_POINTER(DECL_NAME(rhs_field)),
428 "__type_descriptor") == 0);
432 gcc_assert(strcmp(IDENTIFIER_POINTER(DECL_NAME(rhs_field)), "__methods")
434 gcc_assert(POINTER_TYPE_P(TREE_TYPE(v)));
436 tree v1 = build_fold_indirect_ref_loc(location, v);
437 gcc_assert(TREE_CODE(TREE_TYPE(v1)) == RECORD_TYPE);
438 tree f = TYPE_FIELDS(TREE_TYPE(v1));
439 gcc_assert(strcmp(IDENTIFIER_POINTER(DECL_NAME(f)), "__type_descriptor")
441 v1 = build3(COMPONENT_REF, TREE_TYPE(f), v1, f, NULL_TREE);
443 tree eq = fold_build2_loc(location, EQ_EXPR, boolean_type_node, v,
444 fold_convert_loc(location, TREE_TYPE(v),
446 tree n = fold_convert_loc(location, TREE_TYPE(v1), null_pointer_node);
447 return fold_build3_loc(location, COND_EXPR, TREE_TYPE(v1),
451 // Return a tree for the conversion of an interface type to an
455 Expression::convert_interface_to_interface(Translate_context* context,
456 Type *lhs_type, Type *rhs_type,
457 tree rhs_tree, bool for_type_guard,
458 source_location location)
460 Gogo* gogo = context->gogo();
461 Interface_type* lhs_interface_type = lhs_type->interface_type();
462 bool lhs_is_empty = lhs_interface_type->is_empty();
464 tree lhs_type_tree = lhs_type->get_tree(gogo);
465 if (lhs_type_tree == error_mark_node)
466 return error_mark_node;
468 // In the general case this requires runtime examination of the type
469 // method table to match it up with the interface methods.
471 // FIXME: If all of the methods in the right hand side interface
472 // also appear in the left hand side interface, then we don't need
473 // to do a runtime check, although we still need to build a new
476 // Get the type descriptor for the right hand side. This will be
477 // NULL for a nil interface.
479 if (!DECL_P(rhs_tree))
480 rhs_tree = save_expr(rhs_tree);
482 tree rhs_type_descriptor =
483 Expression::get_interface_type_descriptor(context, rhs_type, rhs_tree,
486 // The result is going to be a two element constructor.
488 VEC(constructor_elt,gc)* init = VEC_alloc(constructor_elt, gc, 2);
490 constructor_elt* elt = VEC_quick_push(constructor_elt, init, NULL);
491 tree field = TYPE_FIELDS(lhs_type_tree);
496 // A type assertion fails when converting a nil interface.
497 tree lhs_type_descriptor = lhs_type->type_descriptor_pointer(gogo);
498 static tree assert_interface_decl;
499 tree call = Gogo::call_builtin(&assert_interface_decl,
501 "__go_assert_interface",
504 TREE_TYPE(lhs_type_descriptor),
506 TREE_TYPE(rhs_type_descriptor),
507 rhs_type_descriptor);
508 if (call == error_mark_node)
509 return error_mark_node;
510 // This will panic if the interface conversion fails.
511 TREE_NOTHROW(assert_interface_decl) = 0;
512 elt->value = fold_convert_loc(location, TREE_TYPE(field), call);
514 else if (lhs_is_empty)
516 // A convertion to an empty interface always succeeds, and the
517 // first field is just the type descriptor of the object.
518 gcc_assert(strcmp(IDENTIFIER_POINTER(DECL_NAME(field)),
519 "__type_descriptor") == 0);
520 gcc_assert(TREE_TYPE(field) == TREE_TYPE(rhs_type_descriptor));
521 elt->value = rhs_type_descriptor;
525 // A conversion to a non-empty interface may fail, but unlike a
526 // type assertion converting nil will always succeed.
527 gcc_assert(strcmp(IDENTIFIER_POINTER(DECL_NAME(field)), "__methods")
529 tree lhs_type_descriptor = lhs_type->type_descriptor_pointer(gogo);
530 static tree convert_interface_decl;
531 tree call = Gogo::call_builtin(&convert_interface_decl,
533 "__go_convert_interface",
536 TREE_TYPE(lhs_type_descriptor),
538 TREE_TYPE(rhs_type_descriptor),
539 rhs_type_descriptor);
540 if (call == error_mark_node)
541 return error_mark_node;
542 // This will panic if the interface conversion fails.
543 TREE_NOTHROW(convert_interface_decl) = 0;
544 elt->value = fold_convert_loc(location, TREE_TYPE(field), call);
547 // The second field is simply the object pointer.
549 elt = VEC_quick_push(constructor_elt, init, NULL);
550 field = DECL_CHAIN(field);
551 gcc_assert(strcmp(IDENTIFIER_POINTER(DECL_NAME(field)), "__object") == 0);
554 tree rhs_type_tree = TREE_TYPE(rhs_tree);
555 gcc_assert(TREE_CODE(rhs_type_tree) == RECORD_TYPE);
556 tree rhs_field = DECL_CHAIN(TYPE_FIELDS(rhs_type_tree));
557 gcc_assert(strcmp(IDENTIFIER_POINTER(DECL_NAME(rhs_field)), "__object") == 0);
558 elt->value = build3(COMPONENT_REF, TREE_TYPE(rhs_field), rhs_tree, rhs_field,
561 return build_constructor(lhs_type_tree, init);
564 // Return a tree for the conversion of an interface type to a
565 // non-interface type.
568 Expression::convert_interface_to_type(Translate_context* context,
569 Type *lhs_type, Type* rhs_type,
570 tree rhs_tree, source_location location)
572 Gogo* gogo = context->gogo();
573 tree rhs_type_tree = TREE_TYPE(rhs_tree);
575 tree lhs_type_tree = lhs_type->get_tree(gogo);
576 if (lhs_type_tree == error_mark_node)
577 return error_mark_node;
579 // Call a function to check that the type is valid. The function
580 // will panic with an appropriate runtime type error if the type is
583 tree lhs_type_descriptor = lhs_type->type_descriptor_pointer(gogo);
585 if (!DECL_P(rhs_tree))
586 rhs_tree = save_expr(rhs_tree);
588 tree rhs_type_descriptor =
589 Expression::get_interface_type_descriptor(context, rhs_type, rhs_tree,
592 tree rhs_inter_descriptor = rhs_type->type_descriptor_pointer(gogo);
594 static tree check_interface_type_decl;
595 tree call = Gogo::call_builtin(&check_interface_type_decl,
597 "__go_check_interface_type",
600 TREE_TYPE(lhs_type_descriptor),
602 TREE_TYPE(rhs_type_descriptor),
604 TREE_TYPE(rhs_inter_descriptor),
605 rhs_inter_descriptor);
606 if (call == error_mark_node)
607 return error_mark_node;
608 // This call will panic if the conversion is invalid.
609 TREE_NOTHROW(check_interface_type_decl) = 0;
611 // If the call succeeds, pull out the value.
612 gcc_assert(TREE_CODE(rhs_type_tree) == RECORD_TYPE);
613 tree rhs_field = DECL_CHAIN(TYPE_FIELDS(rhs_type_tree));
614 gcc_assert(strcmp(IDENTIFIER_POINTER(DECL_NAME(rhs_field)), "__object") == 0);
615 tree val = build3(COMPONENT_REF, TREE_TYPE(rhs_field), rhs_tree, rhs_field,
618 // If the value is a pointer, then it is the value we want.
619 // Otherwise it points to the value.
620 if (lhs_type->points_to() == NULL)
622 val = fold_convert_loc(location, build_pointer_type(lhs_type_tree), val);
623 val = build_fold_indirect_ref_loc(location, val);
626 return build2(COMPOUND_EXPR, lhs_type_tree, call,
627 fold_convert_loc(location, lhs_type_tree, val));
630 // Convert an expression to a tree. This is implemented by the child
631 // class. Not that it is not in general safe to call this multiple
632 // times for a single expression, but that we don't catch such errors.
635 Expression::get_tree(Translate_context* context)
637 // The child may have marked this expression as having an error.
638 if (this->classification_ == EXPRESSION_ERROR)
639 return error_mark_node;
641 return this->do_get_tree(context);
644 // Return a tree for VAL in TYPE.
647 Expression::integer_constant_tree(mpz_t val, tree type)
649 if (type == error_mark_node)
650 return error_mark_node;
651 else if (TREE_CODE(type) == INTEGER_TYPE)
652 return double_int_to_tree(type,
653 mpz_get_double_int(type, val, true));
654 else if (TREE_CODE(type) == REAL_TYPE)
657 mpfr_init_set_z(fval, val, GMP_RNDN);
658 tree ret = Expression::float_constant_tree(fval, type);
662 else if (TREE_CODE(type) == COMPLEX_TYPE)
665 mpfr_init_set_z(fval, val, GMP_RNDN);
666 tree real = Expression::float_constant_tree(fval, TREE_TYPE(type));
668 tree imag = build_real_from_int_cst(TREE_TYPE(type),
670 return build_complex(type, real, imag);
676 // Return a tree for VAL in TYPE.
679 Expression::float_constant_tree(mpfr_t val, tree type)
681 if (type == error_mark_node)
682 return error_mark_node;
683 else if (TREE_CODE(type) == INTEGER_TYPE)
687 mpfr_get_z(ival, val, GMP_RNDN);
688 tree ret = Expression::integer_constant_tree(ival, type);
692 else if (TREE_CODE(type) == REAL_TYPE)
695 real_from_mpfr(&r1, val, type, GMP_RNDN);
697 real_convert(&r2, TYPE_MODE(type), &r1);
698 return build_real(type, r2);
700 else if (TREE_CODE(type) == COMPLEX_TYPE)
703 real_from_mpfr(&r1, val, TREE_TYPE(type), GMP_RNDN);
705 real_convert(&r2, TYPE_MODE(TREE_TYPE(type)), &r1);
706 tree imag = build_real_from_int_cst(TREE_TYPE(type),
708 return build_complex(type, build_real(TREE_TYPE(type), r2), imag);
714 // Return a tree for REAL/IMAG in TYPE.
717 Expression::complex_constant_tree(mpfr_t real, mpfr_t imag, tree type)
719 if (type == error_mark_node)
720 return error_mark_node;
721 else if (TREE_CODE(type) == INTEGER_TYPE || TREE_CODE(type) == REAL_TYPE)
722 return Expression::float_constant_tree(real, type);
723 else if (TREE_CODE(type) == COMPLEX_TYPE)
726 real_from_mpfr(&r1, real, TREE_TYPE(type), GMP_RNDN);
728 real_convert(&r2, TYPE_MODE(TREE_TYPE(type)), &r1);
731 real_from_mpfr(&r3, imag, TREE_TYPE(type), GMP_RNDN);
733 real_convert(&r4, TYPE_MODE(TREE_TYPE(type)), &r3);
735 return build_complex(type, build_real(TREE_TYPE(type), r2),
736 build_real(TREE_TYPE(type), r4));
742 // Return a tree which evaluates to true if VAL, of arbitrary integer
743 // type, is negative or is more than the maximum value of BOUND_TYPE.
744 // If SOFAR is not NULL, it is or'red into the result. The return
745 // value may be NULL if SOFAR is NULL.
748 Expression::check_bounds(tree val, tree bound_type, tree sofar,
751 tree val_type = TREE_TYPE(val);
752 tree ret = NULL_TREE;
754 if (!TYPE_UNSIGNED(val_type))
756 ret = fold_build2_loc(loc, LT_EXPR, boolean_type_node, val,
757 build_int_cst(val_type, 0));
758 if (ret == boolean_false_node)
762 if ((TYPE_UNSIGNED(val_type) && !TYPE_UNSIGNED(bound_type))
763 || TYPE_SIZE(val_type) > TYPE_SIZE(bound_type))
765 tree max = TYPE_MAX_VALUE(bound_type);
766 tree big = fold_build2_loc(loc, GT_EXPR, boolean_type_node, val,
767 fold_convert_loc(loc, val_type, max));
768 if (big == boolean_false_node)
770 else if (ret == NULL_TREE)
773 ret = fold_build2_loc(loc, TRUTH_OR_EXPR, boolean_type_node,
777 if (ret == NULL_TREE)
779 else if (sofar == NULL_TREE)
782 return fold_build2_loc(loc, TRUTH_OR_EXPR, boolean_type_node,
786 // Error expressions. This are used to avoid cascading errors.
788 class Error_expression : public Expression
791 Error_expression(source_location location)
792 : Expression(EXPRESSION_ERROR, location)
797 do_is_constant() const
801 do_integer_constant_value(bool, mpz_t val, Type**) const
808 do_float_constant_value(mpfr_t val, Type**) const
810 mpfr_set_ui(val, 0, GMP_RNDN);
815 do_complex_constant_value(mpfr_t real, mpfr_t imag, Type**) const
817 mpfr_set_ui(real, 0, GMP_RNDN);
818 mpfr_set_ui(imag, 0, GMP_RNDN);
823 do_discarding_value()
828 { return Type::make_error_type(); }
831 do_determine_type(const Type_context*)
839 do_is_addressable() const
843 do_get_tree(Translate_context*)
844 { return error_mark_node; }
848 Expression::make_error(source_location location)
850 return new Error_expression(location);
853 // An expression which is really a type. This is used during parsing.
854 // It is an error if these survive after lowering.
857 Type_expression : public Expression
860 Type_expression(Type* type, source_location location)
861 : Expression(EXPRESSION_TYPE, location),
867 do_traverse(Traverse* traverse)
868 { return Type::traverse(this->type_, traverse); }
872 { return this->type_; }
875 do_determine_type(const Type_context*)
879 do_check_types(Gogo*)
880 { this->report_error(_("invalid use of type")); }
887 do_get_tree(Translate_context*)
888 { gcc_unreachable(); }
891 // The type which we are representing as an expression.
896 Expression::make_type(Type* type, source_location location)
898 return new Type_expression(type, location);
901 // Class Parser_expression.
904 Parser_expression::do_type()
906 // We should never really ask for the type of a Parser_expression.
907 // However, it can happen, at least when we have an invalid const
908 // whose initializer refers to the const itself. In that case we
909 // may ask for the type when lowering the const itself.
910 gcc_assert(saw_errors());
911 return Type::make_error_type();
914 // Class Var_expression.
916 // Lower a variable expression. Here we just make sure that the
917 // initialization expression of the variable has been lowered. This
918 // ensures that we will be able to determine the type of the variable
922 Var_expression::do_lower(Gogo* gogo, Named_object* function, int)
924 if (this->variable_->is_variable())
926 Variable* var = this->variable_->var_value();
927 // This is either a local variable or a global variable. A
928 // reference to a variable which is local to an enclosing
929 // function will be a reference to a field in a closure.
930 if (var->is_global())
932 var->lower_init_expression(gogo, function);
937 // Return the name of the variable.
940 Var_expression::name() const
942 return this->variable_->name();
945 // Return the type of a reference to a variable.
948 Var_expression::do_type()
950 if (this->variable_->is_variable())
951 return this->variable_->var_value()->type();
952 else if (this->variable_->is_result_variable())
953 return this->variable_->result_var_value()->type();
958 // Something takes the address of this variable. This means that we
959 // may want to move the variable onto the heap.
962 Var_expression::do_address_taken(bool escapes)
966 else if (this->variable_->is_variable())
967 this->variable_->var_value()->set_address_taken();
968 else if (this->variable_->is_result_variable())
969 this->variable_->result_var_value()->set_address_taken();
974 // Get the tree for a reference to a variable.
977 Var_expression::do_get_tree(Translate_context* context)
979 return this->variable_->get_tree(context->gogo(), context->function());
982 // Make a reference to a variable in an expression.
985 Expression::make_var_reference(Named_object* var, source_location location)
988 return Expression::make_sink(location);
990 // FIXME: Creating a new object for each reference to a variable is
992 return new Var_expression(var, location);
995 // Class Temporary_reference_expression.
1000 Temporary_reference_expression::do_type()
1002 return this->statement_->type();
1005 // Called if something takes the address of this temporary variable.
1006 // We never have to move temporary variables to the heap, but we do
1007 // need to know that they must live in the stack rather than in a
1011 Temporary_reference_expression::do_address_taken(bool)
1013 this->statement_->set_is_address_taken();
1016 // Get a tree referring to the variable.
1019 Temporary_reference_expression::do_get_tree(Translate_context*)
1021 return this->statement_->get_decl();
1024 // Make a reference to a temporary variable.
1027 Expression::make_temporary_reference(Temporary_statement* statement,
1028 source_location location)
1030 return new Temporary_reference_expression(statement, location);
1033 // A sink expression--a use of the blank identifier _.
1035 class Sink_expression : public Expression
1038 Sink_expression(source_location location)
1039 : Expression(EXPRESSION_SINK, location),
1040 type_(NULL), var_(NULL_TREE)
1045 do_discarding_value()
1052 do_determine_type(const Type_context*);
1056 { return new Sink_expression(this->location()); }
1059 do_get_tree(Translate_context*);
1062 // The type of this sink variable.
1064 // The temporary variable we generate.
1068 // Return the type of a sink expression.
1071 Sink_expression::do_type()
1073 if (this->type_ == NULL)
1074 return Type::make_sink_type();
1078 // Determine the type of a sink expression.
1081 Sink_expression::do_determine_type(const Type_context* context)
1083 if (context->type != NULL)
1084 this->type_ = context->type;
1087 // Return a temporary variable for a sink expression. This will
1088 // presumably be a write-only variable which the middle-end will drop.
1091 Sink_expression::do_get_tree(Translate_context* context)
1093 if (this->var_ == NULL_TREE)
1095 gcc_assert(this->type_ != NULL && !this->type_->is_sink_type());
1096 this->var_ = create_tmp_var(this->type_->get_tree(context->gogo()),
1102 // Make a sink expression.
1105 Expression::make_sink(source_location location)
1107 return new Sink_expression(location);
1110 // Class Func_expression.
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
1117 // Return the name of the function.
1120 Func_expression::name() const
1122 return this->function_->name();
1128 Func_expression::do_traverse(Traverse* traverse)
1130 return (this->closure_ == NULL
1132 : Expression::traverse(&this->closure_, traverse));
1135 // Return the type of a function expression.
1138 Func_expression::do_type()
1140 if (this->function_->is_function())
1141 return this->function_->func_value()->type();
1142 else if (this->function_->is_function_declaration())
1143 return this->function_->func_declaration_value()->type();
1148 // Get the tree for a function expression without evaluating the
1152 Func_expression::get_tree_without_closure(Gogo* gogo)
1154 Function_type* fntype;
1155 if (this->function_->is_function())
1156 fntype = this->function_->func_value()->type();
1157 else if (this->function_->is_function_declaration())
1158 fntype = this->function_->func_declaration_value()->type();
1162 // Builtin functions are handled specially by Call_expression. We
1163 // can't take their address.
1164 if (fntype->is_builtin())
1166 error_at(this->location(), "invalid use of special builtin function %qs",
1167 this->function_->name().c_str());
1168 return error_mark_node;
1171 Named_object* no = this->function_;
1173 tree id = no->get_id(gogo);
1174 if (id == error_mark_node)
1175 return error_mark_node;
1178 if (no->is_function())
1179 fndecl = no->func_value()->get_or_make_decl(gogo, no, id);
1180 else if (no->is_function_declaration())
1181 fndecl = no->func_declaration_value()->get_or_make_decl(gogo, no, id);
1185 if (fndecl == error_mark_node)
1186 return error_mark_node;
1188 return build_fold_addr_expr_loc(this->location(), fndecl);
1191 // Get the tree for a function expression. This is used when we take
1192 // the address of a function rather than simply calling it. If the
1193 // function has a closure, we must use a trampoline.
1196 Func_expression::do_get_tree(Translate_context* context)
1198 Gogo* gogo = context->gogo();
1200 tree fnaddr = this->get_tree_without_closure(gogo);
1201 if (fnaddr == error_mark_node)
1202 return error_mark_node;
1204 gcc_assert(TREE_CODE(fnaddr) == ADDR_EXPR
1205 && TREE_CODE(TREE_OPERAND(fnaddr, 0)) == FUNCTION_DECL);
1206 TREE_ADDRESSABLE(TREE_OPERAND(fnaddr, 0)) = 1;
1208 // For a normal non-nested function call, that is all we have to do.
1209 if (!this->function_->is_function()
1210 || this->function_->func_value()->enclosing() == NULL)
1212 gcc_assert(this->closure_ == NULL);
1216 // For a nested function call, we have to always allocate a
1217 // trampoline. If we don't always allocate, then closures will not
1218 // be reliably distinct.
1219 Expression* closure = this->closure_;
1221 if (closure == NULL)
1222 closure_tree = null_pointer_node;
1225 // Get the value of the closure. This will be a pointer to
1226 // space allocated on the heap.
1227 closure_tree = closure->get_tree(context);
1228 if (closure_tree == error_mark_node)
1229 return error_mark_node;
1230 gcc_assert(POINTER_TYPE_P(TREE_TYPE(closure_tree)));
1233 // Now we need to build some code on the heap. This code will load
1234 // the static chain pointer with the closure and then jump to the
1235 // body of the function. The normal gcc approach is to build the
1236 // code on the stack. Unfortunately we can not do that, as Go
1237 // permits us to return the function pointer.
1239 return gogo->make_trampoline(fnaddr, closure_tree, this->location());
1242 // Make a reference to a function in an expression.
1245 Expression::make_func_reference(Named_object* function, Expression* closure,
1246 source_location location)
1248 return new Func_expression(function, closure, location);
1251 // Class Unknown_expression.
1253 // Return the name of an unknown expression.
1256 Unknown_expression::name() const
1258 return this->named_object_->name();
1261 // Lower a reference to an unknown name.
1264 Unknown_expression::do_lower(Gogo*, Named_object*, int)
1266 source_location location = this->location();
1267 Named_object* no = this->named_object_;
1269 if (!no->is_unknown())
1273 real = no->unknown_value()->real_named_object();
1276 if (this->is_composite_literal_key_)
1278 error_at(location, "reference to undefined name %qs",
1279 this->named_object_->message_name().c_str());
1280 return Expression::make_error(location);
1283 switch (real->classification())
1285 case Named_object::NAMED_OBJECT_CONST:
1286 return Expression::make_const_reference(real, location);
1287 case Named_object::NAMED_OBJECT_TYPE:
1288 return Expression::make_type(real->type_value(), location);
1289 case Named_object::NAMED_OBJECT_TYPE_DECLARATION:
1290 if (this->is_composite_literal_key_)
1292 error_at(location, "reference to undefined type %qs",
1293 real->message_name().c_str());
1294 return Expression::make_error(location);
1295 case Named_object::NAMED_OBJECT_VAR:
1296 return Expression::make_var_reference(real, location);
1297 case Named_object::NAMED_OBJECT_FUNC:
1298 case Named_object::NAMED_OBJECT_FUNC_DECLARATION:
1299 return Expression::make_func_reference(real, NULL, location);
1300 case Named_object::NAMED_OBJECT_PACKAGE:
1301 if (this->is_composite_literal_key_)
1303 error_at(location, "unexpected reference to package");
1304 return Expression::make_error(location);
1310 // Make a reference to an unknown name.
1313 Expression::make_unknown_reference(Named_object* no, source_location location)
1315 gcc_assert(no->resolve()->is_unknown());
1316 return new Unknown_expression(no, location);
1319 // A boolean expression.
1321 class Boolean_expression : public Expression
1324 Boolean_expression(bool val, source_location location)
1325 : Expression(EXPRESSION_BOOLEAN, location),
1326 val_(val), type_(NULL)
1334 do_is_constant() const
1341 do_determine_type(const Type_context*);
1348 do_get_tree(Translate_context*)
1349 { return this->val_ ? boolean_true_node : boolean_false_node; }
1352 do_export(Export* exp) const
1353 { exp->write_c_string(this->val_ ? "true" : "false"); }
1358 // The type as determined by context.
1365 Boolean_expression::do_type()
1367 if (this->type_ == NULL)
1368 this->type_ = Type::make_boolean_type();
1372 // Set the type from the context.
1375 Boolean_expression::do_determine_type(const Type_context* context)
1377 if (this->type_ != NULL && !this->type_->is_abstract())
1379 else if (context->type != NULL && context->type->is_boolean_type())
1380 this->type_ = context->type;
1381 else if (!context->may_be_abstract)
1382 this->type_ = Type::lookup_bool_type();
1385 // Import a boolean constant.
1388 Boolean_expression::do_import(Import* imp)
1390 if (imp->peek_char() == 't')
1392 imp->require_c_string("true");
1393 return Expression::make_boolean(true, imp->location());
1397 imp->require_c_string("false");
1398 return Expression::make_boolean(false, imp->location());
1402 // Make a boolean expression.
1405 Expression::make_boolean(bool val, source_location location)
1407 return new Boolean_expression(val, location);
1410 // Class String_expression.
1415 String_expression::do_type()
1417 if (this->type_ == NULL)
1418 this->type_ = Type::make_string_type();
1422 // Set the type from the context.
1425 String_expression::do_determine_type(const Type_context* context)
1427 if (this->type_ != NULL && !this->type_->is_abstract())
1429 else if (context->type != NULL && context->type->is_string_type())
1430 this->type_ = context->type;
1431 else if (!context->may_be_abstract)
1432 this->type_ = Type::lookup_string_type();
1435 // Build a string constant.
1438 String_expression::do_get_tree(Translate_context* context)
1440 return context->gogo()->go_string_constant_tree(this->val_);
1443 // Export a string expression.
1446 String_expression::do_export(Export* exp) const
1449 s.reserve(this->val_.length() * 4 + 2);
1451 for (std::string::const_iterator p = this->val_.begin();
1452 p != this->val_.end();
1455 if (*p == '\\' || *p == '"')
1460 else if (*p >= 0x20 && *p < 0x7f)
1462 else if (*p == '\n')
1464 else if (*p == '\t')
1469 unsigned char c = *p;
1470 unsigned int dig = c >> 4;
1471 s += dig < 10 ? '0' + dig : 'A' + dig - 10;
1473 s += dig < 10 ? '0' + dig : 'A' + dig - 10;
1477 exp->write_string(s);
1480 // Import a string expression.
1483 String_expression::do_import(Import* imp)
1485 imp->require_c_string("\"");
1489 int c = imp->get_char();
1490 if (c == '"' || c == -1)
1493 val += static_cast<char>(c);
1496 c = imp->get_char();
1497 if (c == '\\' || c == '"')
1498 val += static_cast<char>(c);
1505 c = imp->get_char();
1506 unsigned int vh = c >= '0' && c <= '9' ? c - '0' : c - 'A' + 10;
1507 c = imp->get_char();
1508 unsigned int vl = c >= '0' && c <= '9' ? c - '0' : c - 'A' + 10;
1509 char v = (vh << 4) | vl;
1514 error_at(imp->location(), "bad string constant");
1515 return Expression::make_error(imp->location());
1519 return Expression::make_string(val, imp->location());
1522 // Make a string expression.
1525 Expression::make_string(const std::string& val, source_location location)
1527 return new String_expression(val, location);
1530 // Make an integer expression.
1532 class Integer_expression : public Expression
1535 Integer_expression(const mpz_t* val, Type* type, source_location location)
1536 : Expression(EXPRESSION_INTEGER, location),
1538 { mpz_init_set(this->val_, *val); }
1543 // Return whether VAL fits in the type.
1545 check_constant(mpz_t val, Type*, source_location);
1547 // Write VAL to export data.
1549 export_integer(Export* exp, const mpz_t val);
1553 do_is_constant() const
1557 do_integer_constant_value(bool, mpz_t val, Type** ptype) const;
1563 do_determine_type(const Type_context* context);
1566 do_check_types(Gogo*);
1569 do_get_tree(Translate_context*);
1573 { return Expression::make_integer(&this->val_, this->type_,
1574 this->location()); }
1577 do_export(Export*) const;
1580 // The integer value.
1586 // Return an integer constant value.
1589 Integer_expression::do_integer_constant_value(bool, mpz_t val,
1592 if (this->type_ != NULL)
1593 *ptype = this->type_;
1594 mpz_set(val, this->val_);
1598 // Return the current type. If we haven't set the type yet, we return
1599 // an abstract integer type.
1602 Integer_expression::do_type()
1604 if (this->type_ == NULL)
1605 this->type_ = Type::make_abstract_integer_type();
1609 // Set the type of the integer value. Here we may switch from an
1610 // abstract type to a real type.
1613 Integer_expression::do_determine_type(const Type_context* context)
1615 if (this->type_ != NULL && !this->type_->is_abstract())
1617 else if (context->type != NULL
1618 && (context->type->integer_type() != NULL
1619 || context->type->float_type() != NULL
1620 || context->type->complex_type() != NULL))
1621 this->type_ = context->type;
1622 else if (!context->may_be_abstract)
1623 this->type_ = Type::lookup_integer_type("int");
1626 // Return true if the integer VAL fits in the range of the type TYPE.
1627 // Otherwise give an error and return false. TYPE may be NULL.
1630 Integer_expression::check_constant(mpz_t val, Type* type,
1631 source_location location)
1635 Integer_type* itype = type->integer_type();
1636 if (itype == NULL || itype->is_abstract())
1639 int bits = mpz_sizeinbase(val, 2);
1641 if (itype->is_unsigned())
1643 // For an unsigned type we can only accept a nonnegative number,
1644 // and we must be able to represent at least BITS.
1645 if (mpz_sgn(val) >= 0
1646 && bits <= itype->bits())
1651 // For a signed type we need an extra bit to indicate the sign.
1652 // We have to handle the most negative integer specially.
1653 if (bits + 1 <= itype->bits()
1654 || (bits <= itype->bits()
1656 && (mpz_scan1(val, 0)
1657 == static_cast<unsigned long>(itype->bits() - 1))
1658 && mpz_scan0(val, itype->bits()) == ULONG_MAX))
1662 error_at(location, "integer constant overflow");
1666 // Check the type of an integer constant.
1669 Integer_expression::do_check_types(Gogo*)
1671 if (this->type_ == NULL)
1673 if (!Integer_expression::check_constant(this->val_, this->type_,
1675 this->set_is_error();
1678 // Get a tree for an integer constant.
1681 Integer_expression::do_get_tree(Translate_context* context)
1683 Gogo* gogo = context->gogo();
1685 if (this->type_ != NULL && !this->type_->is_abstract())
1686 type = this->type_->get_tree(gogo);
1687 else if (this->type_ != NULL && this->type_->float_type() != NULL)
1689 // We are converting to an abstract floating point type.
1690 type = Type::lookup_float_type("float64")->get_tree(gogo);
1692 else if (this->type_ != NULL && this->type_->complex_type() != NULL)
1694 // We are converting to an abstract complex type.
1695 type = Type::lookup_complex_type("complex128")->get_tree(gogo);
1699 // If we still have an abstract type here, then this is being
1700 // used in a constant expression which didn't get reduced for
1701 // some reason. Use a type which will fit the value. We use <,
1702 // not <=, because we need an extra bit for the sign bit.
1703 int bits = mpz_sizeinbase(this->val_, 2);
1704 if (bits < INT_TYPE_SIZE)
1705 type = Type::lookup_integer_type("int")->get_tree(gogo);
1707 type = Type::lookup_integer_type("int64")->get_tree(gogo);
1709 type = long_long_integer_type_node;
1711 return Expression::integer_constant_tree(this->val_, type);
1714 // Write VAL to export data.
1717 Integer_expression::export_integer(Export* exp, const mpz_t val)
1719 char* s = mpz_get_str(NULL, 10, val);
1720 exp->write_c_string(s);
1724 // Export an integer in a constant expression.
1727 Integer_expression::do_export(Export* exp) const
1729 Integer_expression::export_integer(exp, this->val_);
1730 // A trailing space lets us reliably identify the end of the number.
1731 exp->write_c_string(" ");
1734 // Import an integer, floating point, or complex value. This handles
1735 // all these types because they all start with digits.
1738 Integer_expression::do_import(Import* imp)
1740 std::string num = imp->read_identifier();
1741 imp->require_c_string(" ");
1742 if (!num.empty() && num[num.length() - 1] == 'i')
1745 size_t plus_pos = num.find('+', 1);
1746 size_t minus_pos = num.find('-', 1);
1748 if (plus_pos == std::string::npos)
1750 else if (minus_pos == std::string::npos)
1754 error_at(imp->location(), "bad number in import data: %qs",
1756 return Expression::make_error(imp->location());
1758 if (pos == std::string::npos)
1759 mpfr_set_ui(real, 0, GMP_RNDN);
1762 std::string real_str = num.substr(0, pos);
1763 if (mpfr_init_set_str(real, real_str.c_str(), 10, GMP_RNDN) != 0)
1765 error_at(imp->location(), "bad number in import data: %qs",
1767 return Expression::make_error(imp->location());
1771 std::string imag_str;
1772 if (pos == std::string::npos)
1775 imag_str = num.substr(pos);
1776 imag_str = imag_str.substr(0, imag_str.size() - 1);
1778 if (mpfr_init_set_str(imag, imag_str.c_str(), 10, GMP_RNDN) != 0)
1780 error_at(imp->location(), "bad number in import data: %qs",
1782 return Expression::make_error(imp->location());
1784 Expression* ret = Expression::make_complex(&real, &imag, NULL,
1790 else if (num.find('.') == std::string::npos
1791 && num.find('E') == std::string::npos)
1794 if (mpz_init_set_str(val, num.c_str(), 10) != 0)
1796 error_at(imp->location(), "bad number in import data: %qs",
1798 return Expression::make_error(imp->location());
1800 Expression* ret = Expression::make_integer(&val, NULL, imp->location());
1807 if (mpfr_init_set_str(val, num.c_str(), 10, GMP_RNDN) != 0)
1809 error_at(imp->location(), "bad number in import data: %qs",
1811 return Expression::make_error(imp->location());
1813 Expression* ret = Expression::make_float(&val, NULL, imp->location());
1819 // Build a new integer value.
1822 Expression::make_integer(const mpz_t* val, Type* type,
1823 source_location location)
1825 return new Integer_expression(val, type, location);
1830 class Float_expression : public Expression
1833 Float_expression(const mpfr_t* val, Type* type, source_location location)
1834 : Expression(EXPRESSION_FLOAT, location),
1837 mpfr_init_set(this->val_, *val, GMP_RNDN);
1840 // Constrain VAL to fit into TYPE.
1842 constrain_float(mpfr_t val, Type* type);
1844 // Return whether VAL fits in the type.
1846 check_constant(mpfr_t val, Type*, source_location);
1848 // Write VAL to export data.
1850 export_float(Export* exp, const mpfr_t val);
1854 do_is_constant() const
1858 do_float_constant_value(mpfr_t val, Type**) const;
1864 do_determine_type(const Type_context*);
1867 do_check_types(Gogo*);
1871 { return Expression::make_float(&this->val_, this->type_,
1872 this->location()); }
1875 do_get_tree(Translate_context*);
1878 do_export(Export*) const;
1881 // The floating point value.
1887 // Constrain VAL to fit into TYPE.
1890 Float_expression::constrain_float(mpfr_t val, Type* type)
1892 Float_type* ftype = type->float_type();
1893 if (ftype != NULL && !ftype->is_abstract())
1895 tree type_tree = ftype->type_tree();
1896 REAL_VALUE_TYPE rvt;
1897 real_from_mpfr(&rvt, val, type_tree, GMP_RNDN);
1898 real_convert(&rvt, TYPE_MODE(type_tree), &rvt);
1899 mpfr_from_real(val, &rvt, GMP_RNDN);
1903 // Return a floating point constant value.
1906 Float_expression::do_float_constant_value(mpfr_t val, Type** ptype) const
1908 if (this->type_ != NULL)
1909 *ptype = this->type_;
1910 mpfr_set(val, this->val_, GMP_RNDN);
1914 // Return the current type. If we haven't set the type yet, we return
1915 // an abstract float type.
1918 Float_expression::do_type()
1920 if (this->type_ == NULL)
1921 this->type_ = Type::make_abstract_float_type();
1925 // Set the type of the float value. Here we may switch from an
1926 // abstract type to a real type.
1929 Float_expression::do_determine_type(const Type_context* context)
1931 if (this->type_ != NULL && !this->type_->is_abstract())
1933 else if (context->type != NULL
1934 && (context->type->integer_type() != NULL
1935 || context->type->float_type() != NULL
1936 || context->type->complex_type() != NULL))
1937 this->type_ = context->type;
1938 else if (!context->may_be_abstract)
1939 this->type_ = Type::lookup_float_type("float64");
1942 // Return true if the floating point value VAL fits in the range of
1943 // the type TYPE. Otherwise give an error and return false. TYPE may
1947 Float_expression::check_constant(mpfr_t val, Type* type,
1948 source_location location)
1952 Float_type* ftype = type->float_type();
1953 if (ftype == NULL || ftype->is_abstract())
1956 // A NaN or Infinity always fits in the range of the type.
1957 if (mpfr_nan_p(val) || mpfr_inf_p(val) || mpfr_zero_p(val))
1960 mp_exp_t exp = mpfr_get_exp(val);
1962 switch (ftype->bits())
1975 error_at(location, "floating point constant overflow");
1981 // Check the type of a float value.
1984 Float_expression::do_check_types(Gogo*)
1986 if (this->type_ == NULL)
1989 if (!Float_expression::check_constant(this->val_, this->type_,
1991 this->set_is_error();
1993 Integer_type* integer_type = this->type_->integer_type();
1994 if (integer_type != NULL)
1996 if (!mpfr_integer_p(this->val_))
1997 this->report_error(_("floating point constant truncated to integer"));
2000 gcc_assert(!integer_type->is_abstract());
2003 mpfr_get_z(ival, this->val_, GMP_RNDN);
2004 Integer_expression::check_constant(ival, integer_type,
2011 // Get a tree for a float constant.
2014 Float_expression::do_get_tree(Translate_context* context)
2016 Gogo* gogo = context->gogo();
2018 if (this->type_ != NULL && !this->type_->is_abstract())
2019 type = this->type_->get_tree(gogo);
2020 else if (this->type_ != NULL && this->type_->integer_type() != NULL)
2022 // We have an abstract integer type. We just hope for the best.
2023 type = Type::lookup_integer_type("int")->get_tree(gogo);
2027 // If we still have an abstract type here, then this is being
2028 // used in a constant expression which didn't get reduced. We
2029 // just use float64 and hope for the best.
2030 type = Type::lookup_float_type("float64")->get_tree(gogo);
2032 return Expression::float_constant_tree(this->val_, type);
2035 // Write a floating point number to export data.
2038 Float_expression::export_float(Export *exp, const mpfr_t val)
2041 char* s = mpfr_get_str(NULL, &exponent, 10, 0, val, GMP_RNDN);
2043 exp->write_c_string("-");
2044 exp->write_c_string("0.");
2045 exp->write_c_string(*s == '-' ? s + 1 : s);
2048 snprintf(buf, sizeof buf, "E%ld", exponent);
2049 exp->write_c_string(buf);
2052 // Export a floating point number in a constant expression.
2055 Float_expression::do_export(Export* exp) const
2057 Float_expression::export_float(exp, this->val_);
2058 // A trailing space lets us reliably identify the end of the number.
2059 exp->write_c_string(" ");
2062 // Make a float expression.
2065 Expression::make_float(const mpfr_t* val, Type* type, source_location location)
2067 return new Float_expression(val, type, location);
2072 class Complex_expression : public Expression
2075 Complex_expression(const mpfr_t* real, const mpfr_t* imag, Type* type,
2076 source_location location)
2077 : Expression(EXPRESSION_COMPLEX, location),
2080 mpfr_init_set(this->real_, *real, GMP_RNDN);
2081 mpfr_init_set(this->imag_, *imag, GMP_RNDN);
2084 // Constrain REAL/IMAG to fit into TYPE.
2086 constrain_complex(mpfr_t real, mpfr_t imag, Type* type);
2088 // Return whether REAL/IMAG fits in the type.
2090 check_constant(mpfr_t real, mpfr_t imag, Type*, source_location);
2092 // Write REAL/IMAG to export data.
2094 export_complex(Export* exp, const mpfr_t real, const mpfr_t val);
2098 do_is_constant() const
2102 do_complex_constant_value(mpfr_t real, mpfr_t imag, Type**) const;
2108 do_determine_type(const Type_context*);
2111 do_check_types(Gogo*);
2116 return Expression::make_complex(&this->real_, &this->imag_, this->type_,
2121 do_get_tree(Translate_context*);
2124 do_export(Export*) const;
2129 // The imaginary part;
2131 // The type if known.
2135 // Constrain REAL/IMAG to fit into TYPE.
2138 Complex_expression::constrain_complex(mpfr_t real, mpfr_t imag, Type* type)
2140 Complex_type* ctype = type->complex_type();
2141 if (ctype != NULL && !ctype->is_abstract())
2143 tree type_tree = ctype->type_tree();
2145 REAL_VALUE_TYPE rvt;
2146 real_from_mpfr(&rvt, real, TREE_TYPE(type_tree), GMP_RNDN);
2147 real_convert(&rvt, TYPE_MODE(TREE_TYPE(type_tree)), &rvt);
2148 mpfr_from_real(real, &rvt, GMP_RNDN);
2150 real_from_mpfr(&rvt, imag, TREE_TYPE(type_tree), GMP_RNDN);
2151 real_convert(&rvt, TYPE_MODE(TREE_TYPE(type_tree)), &rvt);
2152 mpfr_from_real(imag, &rvt, GMP_RNDN);
2156 // Return a complex constant value.
2159 Complex_expression::do_complex_constant_value(mpfr_t real, mpfr_t imag,
2162 if (this->type_ != NULL)
2163 *ptype = this->type_;
2164 mpfr_set(real, this->real_, GMP_RNDN);
2165 mpfr_set(imag, this->imag_, GMP_RNDN);
2169 // Return the current type. If we haven't set the type yet, we return
2170 // an abstract complex type.
2173 Complex_expression::do_type()
2175 if (this->type_ == NULL)
2176 this->type_ = Type::make_abstract_complex_type();
2180 // Set the type of the complex value. Here we may switch from an
2181 // abstract type to a real type.
2184 Complex_expression::do_determine_type(const Type_context* context)
2186 if (this->type_ != NULL && !this->type_->is_abstract())
2188 else if (context->type != NULL
2189 && context->type->complex_type() != NULL)
2190 this->type_ = context->type;
2191 else if (!context->may_be_abstract)
2192 this->type_ = Type::lookup_complex_type("complex128");
2195 // Return true if the complex value REAL/IMAG fits in the range of the
2196 // type TYPE. Otherwise give an error and return false. TYPE may be
2200 Complex_expression::check_constant(mpfr_t real, mpfr_t imag, Type* type,
2201 source_location location)
2205 Complex_type* ctype = type->complex_type();
2206 if (ctype == NULL || ctype->is_abstract())
2210 switch (ctype->bits())
2222 // A NaN or Infinity always fits in the range of the type.
2223 if (!mpfr_nan_p(real) && !mpfr_inf_p(real) && !mpfr_zero_p(real))
2225 if (mpfr_get_exp(real) > max_exp)
2227 error_at(location, "complex real part constant overflow");
2232 if (!mpfr_nan_p(imag) && !mpfr_inf_p(imag) && !mpfr_zero_p(imag))
2234 if (mpfr_get_exp(imag) > max_exp)
2236 error_at(location, "complex imaginary part constant overflow");
2244 // Check the type of a complex value.
2247 Complex_expression::do_check_types(Gogo*)
2249 if (this->type_ == NULL)
2252 if (!Complex_expression::check_constant(this->real_, this->imag_,
2253 this->type_, this->location()))
2254 this->set_is_error();
2257 // Get a tree for a complex constant.
2260 Complex_expression::do_get_tree(Translate_context* context)
2262 Gogo* gogo = context->gogo();
2264 if (this->type_ != NULL && !this->type_->is_abstract())
2265 type = this->type_->get_tree(gogo);
2268 // If we still have an abstract type here, this this is being
2269 // used in a constant expression which didn't get reduced. We
2270 // just use complex128 and hope for the best.
2271 type = Type::lookup_complex_type("complex128")->get_tree(gogo);
2273 return Expression::complex_constant_tree(this->real_, this->imag_, type);
2276 // Write REAL/IMAG to export data.
2279 Complex_expression::export_complex(Export* exp, const mpfr_t real,
2282 if (!mpfr_zero_p(real))
2284 Float_expression::export_float(exp, real);
2285 if (mpfr_sgn(imag) > 0)
2286 exp->write_c_string("+");
2288 Float_expression::export_float(exp, imag);
2289 exp->write_c_string("i");
2292 // Export a complex number in a constant expression.
2295 Complex_expression::do_export(Export* exp) const
2297 Complex_expression::export_complex(exp, this->real_, this->imag_);
2298 // A trailing space lets us reliably identify the end of the number.
2299 exp->write_c_string(" ");
2302 // Make a complex expression.
2305 Expression::make_complex(const mpfr_t* real, const mpfr_t* imag, Type* type,
2306 source_location location)
2308 return new Complex_expression(real, imag, type, location);
2311 // Find a named object in an expression.
2313 class Find_named_object : public Traverse
2316 Find_named_object(Named_object* no)
2317 : Traverse(traverse_expressions),
2318 no_(no), found_(false)
2321 // Whether we found the object.
2324 { return this->found_; }
2328 expression(Expression**);
2331 // The object we are looking for.
2333 // Whether we found it.
2337 // A reference to a const in an expression.
2339 class Const_expression : public Expression
2342 Const_expression(Named_object* constant, source_location location)
2343 : Expression(EXPRESSION_CONST_REFERENCE, location),
2344 constant_(constant), type_(NULL), seen_(false)
2349 { return this->constant_; }
2353 { return this->constant_->name(); }
2355 // Check that the initializer does not refer to the constant itself.
2357 check_for_init_loop();
2361 do_lower(Gogo*, Named_object*, int);
2364 do_is_constant() const
2368 do_integer_constant_value(bool, mpz_t val, Type**) const;
2371 do_float_constant_value(mpfr_t val, Type**) const;
2374 do_complex_constant_value(mpfr_t real, mpfr_t imag, Type**) const;
2377 do_string_constant_value(std::string* val) const
2378 { return this->constant_->const_value()->expr()->string_constant_value(val); }
2383 // The type of a const is set by the declaration, not the use.
2385 do_determine_type(const Type_context*);
2388 do_check_types(Gogo*);
2395 do_get_tree(Translate_context* context);
2397 // When exporting a reference to a const as part of a const
2398 // expression, we export the value. We ignore the fact that it has
2401 do_export(Export* exp) const
2402 { this->constant_->const_value()->expr()->export_expression(exp); }
2406 Named_object* constant_;
2407 // The type of this reference. This is used if the constant has an
2410 // Used to prevent infinite recursion when a constant incorrectly
2411 // refers to itself.
2415 // Lower a constant expression. This is where we convert the
2416 // predeclared constant iota into an integer value.
2419 Const_expression::do_lower(Gogo* gogo, Named_object*, int iota_value)
2421 if (this->constant_->const_value()->expr()->classification()
2424 if (iota_value == -1)
2426 error_at(this->location(),
2427 "iota is only defined in const declarations");
2431 mpz_init_set_ui(val, static_cast<unsigned long>(iota_value));
2432 Expression* ret = Expression::make_integer(&val, NULL,
2438 // Make sure that the constant itself has been lowered.
2439 gogo->lower_constant(this->constant_);
2444 // Return an integer constant value.
2447 Const_expression::do_integer_constant_value(bool iota_is_constant, mpz_t val,
2454 if (this->type_ != NULL)
2455 ctype = this->type_;
2457 ctype = this->constant_->const_value()->type();
2458 if (ctype != NULL && ctype->integer_type() == NULL)
2461 Expression* e = this->constant_->const_value()->expr();
2466 bool r = e->integer_constant_value(iota_is_constant, val, &t);
2468 this->seen_ = false;
2472 && !Integer_expression::check_constant(val, ctype, this->location()))
2475 *ptype = ctype != NULL ? ctype : t;
2479 // Return a floating point constant value.
2482 Const_expression::do_float_constant_value(mpfr_t val, Type** ptype) const
2488 if (this->type_ != NULL)
2489 ctype = this->type_;
2491 ctype = this->constant_->const_value()->type();
2492 if (ctype != NULL && ctype->float_type() == NULL)
2498 bool r = this->constant_->const_value()->expr()->float_constant_value(val,
2501 this->seen_ = false;
2503 if (r && ctype != NULL)
2505 if (!Float_expression::check_constant(val, ctype, this->location()))
2507 Float_expression::constrain_float(val, ctype);
2509 *ptype = ctype != NULL ? ctype : t;
2513 // Return a complex constant value.
2516 Const_expression::do_complex_constant_value(mpfr_t real, mpfr_t imag,
2523 if (this->type_ != NULL)
2524 ctype = this->type_;
2526 ctype = this->constant_->const_value()->type();
2527 if (ctype != NULL && ctype->complex_type() == NULL)
2533 bool r = this->constant_->const_value()->expr()->complex_constant_value(real,
2537 this->seen_ = false;
2539 if (r && ctype != NULL)
2541 if (!Complex_expression::check_constant(real, imag, ctype,
2544 Complex_expression::constrain_complex(real, imag, ctype);
2546 *ptype = ctype != NULL ? ctype : t;
2550 // Return the type of the const reference.
2553 Const_expression::do_type()
2555 if (this->type_ != NULL)
2558 Named_constant* nc = this->constant_->const_value();
2560 if (this->seen_ || nc->lowering())
2562 this->report_error(_("constant refers to itself"));
2563 this->type_ = Type::make_error_type();
2569 Type* ret = nc->type();
2573 this->seen_ = false;
2577 // During parsing, a named constant may have a NULL type, but we
2578 // must not return a NULL type here.
2579 ret = nc->expr()->type();
2581 this->seen_ = false;
2586 // Set the type of the const reference.
2589 Const_expression::do_determine_type(const Type_context* context)
2591 Type* ctype = this->constant_->const_value()->type();
2592 Type* cetype = (ctype != NULL
2594 : this->constant_->const_value()->expr()->type());
2595 if (ctype != NULL && !ctype->is_abstract())
2597 else if (context->type != NULL
2598 && (context->type->integer_type() != NULL
2599 || context->type->float_type() != NULL
2600 || context->type->complex_type() != NULL)
2601 && (cetype->integer_type() != NULL
2602 || cetype->float_type() != NULL
2603 || cetype->complex_type() != NULL))
2604 this->type_ = context->type;
2605 else if (context->type != NULL
2606 && context->type->is_string_type()
2607 && cetype->is_string_type())
2608 this->type_ = context->type;
2609 else if (context->type != NULL
2610 && context->type->is_boolean_type()
2611 && cetype->is_boolean_type())
2612 this->type_ = context->type;
2613 else if (!context->may_be_abstract)
2615 if (cetype->is_abstract())
2616 cetype = cetype->make_non_abstract_type();
2617 this->type_ = cetype;
2621 // Check for a loop in which the initializer of a constant refers to
2622 // the constant itself.
2625 Const_expression::check_for_init_loop()
2627 if (this->type_ != NULL && this->type_->is_error_type())
2632 this->report_error(_("constant refers to itself"));
2633 this->type_ = Type::make_error_type();
2637 Expression* init = this->constant_->const_value()->expr();
2638 Find_named_object find_named_object(this->constant_);
2641 Expression::traverse(&init, &find_named_object);
2642 this->seen_ = false;
2644 if (find_named_object.found())
2646 if (this->type_ == NULL || !this->type_->is_error_type())
2648 this->report_error(_("constant refers to itself"));
2649 this->type_ = Type::make_error_type();
2655 // Check types of a const reference.
2658 Const_expression::do_check_types(Gogo*)
2660 if (this->type_ != NULL && this->type_->is_error_type())
2663 this->check_for_init_loop();
2665 if (this->type_ == NULL || this->type_->is_abstract())
2668 // Check for integer overflow.
2669 if (this->type_->integer_type() != NULL)
2674 if (!this->integer_constant_value(true, ival, &dummy))
2678 Expression* cexpr = this->constant_->const_value()->expr();
2679 if (cexpr->float_constant_value(fval, &dummy))
2681 if (!mpfr_integer_p(fval))
2682 this->report_error(_("floating point constant "
2683 "truncated to integer"));
2686 mpfr_get_z(ival, fval, GMP_RNDN);
2687 Integer_expression::check_constant(ival, this->type_,
2697 // Return a tree for the const reference.
2700 Const_expression::do_get_tree(Translate_context* context)
2702 Gogo* gogo = context->gogo();
2704 if (this->type_ == NULL)
2705 type_tree = NULL_TREE;
2708 type_tree = this->type_->get_tree(gogo);
2709 if (type_tree == error_mark_node)
2710 return error_mark_node;
2713 // If the type has been set for this expression, but the underlying
2714 // object is an abstract int or float, we try to get the abstract
2715 // value. Otherwise we may lose something in the conversion.
2716 if (this->type_ != NULL
2717 && (this->constant_->const_value()->type() == NULL
2718 || this->constant_->const_value()->type()->is_abstract()))
2720 Expression* expr = this->constant_->const_value()->expr();
2724 if (expr->integer_constant_value(true, ival, &t))
2726 tree ret = Expression::integer_constant_tree(ival, type_tree);
2734 if (expr->float_constant_value(fval, &t))
2736 tree ret = Expression::float_constant_tree(fval, type_tree);
2743 if (expr->complex_constant_value(fval, imag, &t))
2745 tree ret = Expression::complex_constant_tree(fval, imag, type_tree);
2754 tree const_tree = this->constant_->get_tree(gogo, context->function());
2755 if (this->type_ == NULL
2756 || const_tree == error_mark_node
2757 || TREE_TYPE(const_tree) == error_mark_node)
2761 if (TYPE_MAIN_VARIANT(type_tree) == TYPE_MAIN_VARIANT(TREE_TYPE(const_tree)))
2762 ret = fold_convert(type_tree, const_tree);
2763 else if (TREE_CODE(type_tree) == INTEGER_TYPE)
2764 ret = fold(convert_to_integer(type_tree, const_tree));
2765 else if (TREE_CODE(type_tree) == REAL_TYPE)
2766 ret = fold(convert_to_real(type_tree, const_tree));
2767 else if (TREE_CODE(type_tree) == COMPLEX_TYPE)
2768 ret = fold(convert_to_complex(type_tree, const_tree));
2774 // Make a reference to a constant in an expression.
2777 Expression::make_const_reference(Named_object* constant,
2778 source_location location)
2780 return new Const_expression(constant, location);
2783 // Find a named object in an expression.
2786 Find_named_object::expression(Expression** pexpr)
2788 switch ((*pexpr)->classification())
2790 case Expression::EXPRESSION_CONST_REFERENCE:
2792 Const_expression* ce = static_cast<Const_expression*>(*pexpr);
2793 if (ce->named_object() == this->no_)
2796 // We need to check a constant initializer explicitly, as
2797 // loops here will not be caught by the loop checking for
2798 // variable initializers.
2799 ce->check_for_init_loop();
2801 return TRAVERSE_CONTINUE;
2804 case Expression::EXPRESSION_VAR_REFERENCE:
2805 if ((*pexpr)->var_expression()->named_object() == this->no_)
2807 return TRAVERSE_CONTINUE;
2808 case Expression::EXPRESSION_FUNC_REFERENCE:
2809 if ((*pexpr)->func_expression()->named_object() == this->no_)
2811 return TRAVERSE_CONTINUE;
2813 return TRAVERSE_CONTINUE;
2815 this->found_ = true;
2816 return TRAVERSE_EXIT;
2821 class Nil_expression : public Expression
2824 Nil_expression(source_location location)
2825 : Expression(EXPRESSION_NIL, location)
2833 do_is_constant() const
2838 { return Type::make_nil_type(); }
2841 do_determine_type(const Type_context*)
2849 do_get_tree(Translate_context*)
2850 { return null_pointer_node; }
2853 do_export(Export* exp) const
2854 { exp->write_c_string("nil"); }
2857 // Import a nil expression.
2860 Nil_expression::do_import(Import* imp)
2862 imp->require_c_string("nil");
2863 return Expression::make_nil(imp->location());
2866 // Make a nil expression.
2869 Expression::make_nil(source_location location)
2871 return new Nil_expression(location);
2874 // The value of the predeclared constant iota. This is little more
2875 // than a marker. This will be lowered to an integer in
2876 // Const_expression::do_lower, which is where we know the value that
2879 class Iota_expression : public Parser_expression
2882 Iota_expression(source_location location)
2883 : Parser_expression(EXPRESSION_IOTA, location)
2888 do_lower(Gogo*, Named_object*, int)
2889 { gcc_unreachable(); }
2891 // There should only ever be one of these.
2894 { gcc_unreachable(); }
2897 // Make an iota expression. This is only called for one case: the
2898 // value of the predeclared constant iota.
2901 Expression::make_iota()
2903 static Iota_expression iota_expression(UNKNOWN_LOCATION);
2904 return &iota_expression;
2907 // A type conversion expression.
2909 class Type_conversion_expression : public Expression
2912 Type_conversion_expression(Type* type, Expression* expr,
2913 source_location location)
2914 : Expression(EXPRESSION_CONVERSION, location),
2915 type_(type), expr_(expr), may_convert_function_types_(false)
2918 // Return the type to which we are converting.
2921 { return this->type_; }
2923 // Return the expression which we are converting.
2926 { return this->expr_; }
2928 // Permit converting from one function type to another. This is
2929 // used internally for method expressions.
2931 set_may_convert_function_types()
2933 this->may_convert_function_types_ = true;
2936 // Import a type conversion expression.
2942 do_traverse(Traverse* traverse);
2945 do_lower(Gogo*, Named_object*, int);
2948 do_is_constant() const
2949 { return this->expr_->is_constant(); }
2952 do_integer_constant_value(bool, mpz_t, Type**) const;
2955 do_float_constant_value(mpfr_t, Type**) const;
2958 do_complex_constant_value(mpfr_t, mpfr_t, Type**) const;
2961 do_string_constant_value(std::string*) const;
2965 { return this->type_; }
2968 do_determine_type(const Type_context*)
2970 Type_context subcontext(this->type_, false);
2971 this->expr_->determine_type(&subcontext);
2975 do_check_types(Gogo*);
2980 return new Type_conversion_expression(this->type_, this->expr_->copy(),
2985 do_get_tree(Translate_context* context);
2988 do_export(Export*) const;
2991 // The type to convert to.
2993 // The expression to convert.
2995 // True if this is permitted to convert function types. This is
2996 // used internally for method expressions.
2997 bool may_convert_function_types_;
3003 Type_conversion_expression::do_traverse(Traverse* traverse)
3005 if (Expression::traverse(&this->expr_, traverse) == TRAVERSE_EXIT
3006 || Type::traverse(this->type_, traverse) == TRAVERSE_EXIT)
3007 return TRAVERSE_EXIT;
3008 return TRAVERSE_CONTINUE;
3011 // Convert to a constant at lowering time.
3014 Type_conversion_expression::do_lower(Gogo*, Named_object*, int)
3016 Type* type = this->type_;
3017 Expression* val = this->expr_;
3018 source_location location = this->location();
3020 if (type->integer_type() != NULL)
3025 if (val->integer_constant_value(false, ival, &dummy))
3027 if (!Integer_expression::check_constant(ival, type, location))
3028 mpz_set_ui(ival, 0);
3029 Expression* ret = Expression::make_integer(&ival, type, location);
3036 if (val->float_constant_value(fval, &dummy))
3038 if (!mpfr_integer_p(fval))
3041 "floating point constant truncated to integer");
3042 return Expression::make_error(location);
3044 mpfr_get_z(ival, fval, GMP_RNDN);
3045 if (!Integer_expression::check_constant(ival, type, location))
3046 mpz_set_ui(ival, 0);
3047 Expression* ret = Expression::make_integer(&ival, type, location);
3056 if (type->float_type() != NULL)
3061 if (val->float_constant_value(fval, &dummy))
3063 if (!Float_expression::check_constant(fval, type, location))
3064 mpfr_set_ui(fval, 0, GMP_RNDN);
3065 Float_expression::constrain_float(fval, type);
3066 Expression *ret = Expression::make_float(&fval, type, location);
3073 if (type->complex_type() != NULL)
3080 if (val->complex_constant_value(real, imag, &dummy))
3082 if (!Complex_expression::check_constant(real, imag, type, location))
3084 mpfr_set_ui(real, 0, GMP_RNDN);
3085 mpfr_set_ui(imag, 0, GMP_RNDN);
3087 Complex_expression::constrain_complex(real, imag, type);
3088 Expression* ret = Expression::make_complex(&real, &imag, type,
3098 if (type->is_open_array_type() && type->named_type() == NULL)
3100 Type* element_type = type->array_type()->element_type()->forwarded();
3101 bool is_byte = element_type == Type::lookup_integer_type("uint8");
3102 bool is_int = element_type == Type::lookup_integer_type("int");
3103 if (is_byte || is_int)
3106 if (val->string_constant_value(&s))
3108 Expression_list* vals = new Expression_list();
3111 for (std::string::const_iterator p = s.begin();
3116 mpz_init_set_ui(val, static_cast<unsigned char>(*p));
3117 Expression* v = Expression::make_integer(&val,
3126 const char *p = s.data();
3127 const char *pend = s.data() + s.length();
3131 int adv = Lex::fetch_char(p, &c);
3134 warning_at(this->location(), 0,
3135 "invalid UTF-8 encoding");
3140 mpz_init_set_ui(val, c);
3141 Expression* v = Expression::make_integer(&val,
3149 return Expression::make_slice_composite_literal(type, vals,
3158 // Return the constant integer value if there is one.
3161 Type_conversion_expression::do_integer_constant_value(bool iota_is_constant,
3165 if (this->type_->integer_type() == NULL)
3171 if (this->expr_->integer_constant_value(iota_is_constant, ival, &dummy))
3173 if (!Integer_expression::check_constant(ival, this->type_,
3181 *ptype = this->type_;
3188 if (this->expr_->float_constant_value(fval, &dummy))
3190 mpfr_get_z(val, fval, GMP_RNDN);
3192 if (!Integer_expression::check_constant(val, this->type_,
3195 *ptype = this->type_;
3203 // Return the constant floating point value if there is one.
3206 Type_conversion_expression::do_float_constant_value(mpfr_t val,
3209 if (this->type_->float_type() == NULL)
3215 if (this->expr_->float_constant_value(fval, &dummy))
3217 if (!Float_expression::check_constant(fval, this->type_,
3223 mpfr_set(val, fval, GMP_RNDN);
3225 Float_expression::constrain_float(val, this->type_);
3226 *ptype = this->type_;
3234 // Return the constant complex value if there is one.
3237 Type_conversion_expression::do_complex_constant_value(mpfr_t real,
3241 if (this->type_->complex_type() == NULL)
3249 if (this->expr_->complex_constant_value(rval, ival, &dummy))
3251 if (!Complex_expression::check_constant(rval, ival, this->type_,
3258 mpfr_set(real, rval, GMP_RNDN);
3259 mpfr_set(imag, ival, GMP_RNDN);
3262 Complex_expression::constrain_complex(real, imag, this->type_);
3263 *ptype = this->type_;
3272 // Return the constant string value if there is one.
3275 Type_conversion_expression::do_string_constant_value(std::string* val) const
3277 if (this->type_->is_string_type()
3278 && this->expr_->type()->integer_type() != NULL)
3283 if (this->expr_->integer_constant_value(false, ival, &dummy))
3285 unsigned long ulval = mpz_get_ui(ival);
3286 if (mpz_cmp_ui(ival, ulval) == 0)
3288 Lex::append_char(ulval, true, val, this->location());
3296 // FIXME: Could handle conversion from const []int here.
3301 // Check that types are convertible.
3304 Type_conversion_expression::do_check_types(Gogo*)
3306 Type* type = this->type_;
3307 Type* expr_type = this->expr_->type();
3310 if (type->is_error_type()
3311 || type->is_undefined()
3312 || expr_type->is_error_type()
3313 || expr_type->is_undefined())
3315 // Make sure we emit an error for an undefined type.
3318 this->set_is_error();
3322 if (this->may_convert_function_types_
3323 && type->function_type() != NULL
3324 && expr_type->function_type() != NULL)
3327 if (Type::are_convertible(type, expr_type, &reason))
3330 error_at(this->location(), "%s", reason.c_str());
3331 this->set_is_error();
3334 // Get a tree for a type conversion.
3337 Type_conversion_expression::do_get_tree(Translate_context* context)
3339 Gogo* gogo = context->gogo();
3340 tree type_tree = this->type_->get_tree(gogo);
3341 tree expr_tree = this->expr_->get_tree(context);
3343 if (type_tree == error_mark_node
3344 || expr_tree == error_mark_node
3345 || TREE_TYPE(expr_tree) == error_mark_node)
3346 return error_mark_node;
3348 if (TYPE_MAIN_VARIANT(type_tree) == TYPE_MAIN_VARIANT(TREE_TYPE(expr_tree)))
3349 return fold_convert(type_tree, expr_tree);
3351 Type* type = this->type_;
3352 Type* expr_type = this->expr_->type();
3354 if (type->interface_type() != NULL || expr_type->interface_type() != NULL)
3355 ret = Expression::convert_for_assignment(context, type, expr_type,
3356 expr_tree, this->location());
3357 else if (type->integer_type() != NULL)
3359 if (expr_type->integer_type() != NULL
3360 || expr_type->float_type() != NULL
3361 || expr_type->is_unsafe_pointer_type())
3362 ret = fold(convert_to_integer(type_tree, expr_tree));
3366 else if (type->float_type() != NULL)
3368 if (expr_type->integer_type() != NULL
3369 || expr_type->float_type() != NULL)
3370 ret = fold(convert_to_real(type_tree, expr_tree));
3374 else if (type->complex_type() != NULL)
3376 if (expr_type->complex_type() != NULL)
3377 ret = fold(convert_to_complex(type_tree, expr_tree));
3381 else if (type->is_string_type()
3382 && expr_type->integer_type() != NULL)
3384 expr_tree = fold_convert(integer_type_node, expr_tree);
3385 if (host_integerp(expr_tree, 0))
3387 HOST_WIDE_INT intval = tree_low_cst(expr_tree, 0);
3389 Lex::append_char(intval, true, &s, this->location());
3390 Expression* se = Expression::make_string(s, this->location());
3391 return se->get_tree(context);
3394 static tree int_to_string_fndecl;
3395 ret = Gogo::call_builtin(&int_to_string_fndecl,
3397 "__go_int_to_string",
3401 fold_convert(integer_type_node, expr_tree));
3403 else if (type->is_string_type()
3404 && (expr_type->array_type() != NULL
3405 || (expr_type->points_to() != NULL
3406 && expr_type->points_to()->array_type() != NULL)))
3408 Type* t = expr_type;
3409 if (t->points_to() != NULL)
3412 expr_tree = build_fold_indirect_ref(expr_tree);
3414 if (!DECL_P(expr_tree))
3415 expr_tree = save_expr(expr_tree);
3416 Array_type* a = t->array_type();
3417 Type* e = a->element_type()->forwarded();
3418 gcc_assert(e->integer_type() != NULL);
3419 tree valptr = fold_convert(const_ptr_type_node,
3420 a->value_pointer_tree(gogo, expr_tree));
3421 tree len = a->length_tree(gogo, expr_tree);
3422 len = fold_convert_loc(this->location(), size_type_node, len);
3423 if (e->integer_type()->is_unsigned()
3424 && e->integer_type()->bits() == 8)
3426 static tree byte_array_to_string_fndecl;
3427 ret = Gogo::call_builtin(&byte_array_to_string_fndecl,
3429 "__go_byte_array_to_string",
3432 const_ptr_type_node,
3439 gcc_assert(e == Type::lookup_integer_type("int"));
3440 static tree int_array_to_string_fndecl;
3441 ret = Gogo::call_builtin(&int_array_to_string_fndecl,
3443 "__go_int_array_to_string",
3446 const_ptr_type_node,
3452 else if (type->is_open_array_type() && expr_type->is_string_type())
3454 Type* e = type->array_type()->element_type()->forwarded();
3455 gcc_assert(e->integer_type() != NULL);
3456 if (e->integer_type()->is_unsigned()
3457 && e->integer_type()->bits() == 8)
3459 static tree string_to_byte_array_fndecl;
3460 ret = Gogo::call_builtin(&string_to_byte_array_fndecl,
3462 "__go_string_to_byte_array",
3465 TREE_TYPE(expr_tree),
3470 gcc_assert(e == Type::lookup_integer_type("int"));
3471 static tree string_to_int_array_fndecl;
3472 ret = Gogo::call_builtin(&string_to_int_array_fndecl,
3474 "__go_string_to_int_array",
3477 TREE_TYPE(expr_tree),
3481 else if ((type->is_unsafe_pointer_type()
3482 && expr_type->points_to() != NULL)
3483 || (expr_type->is_unsafe_pointer_type()
3484 && type->points_to() != NULL))
3485 ret = fold_convert(type_tree, expr_tree);
3486 else if (type->is_unsafe_pointer_type()
3487 && expr_type->integer_type() != NULL)
3488 ret = convert_to_pointer(type_tree, expr_tree);
3489 else if (this->may_convert_function_types_
3490 && type->function_type() != NULL
3491 && expr_type->function_type() != NULL)
3492 ret = fold_convert_loc(this->location(), type_tree, expr_tree);
3494 ret = Expression::convert_for_assignment(context, type, expr_type,
3495 expr_tree, this->location());
3500 // Output a type conversion in a constant expression.
3503 Type_conversion_expression::do_export(Export* exp) const
3505 exp->write_c_string("convert(");
3506 exp->write_type(this->type_);
3507 exp->write_c_string(", ");
3508 this->expr_->export_expression(exp);
3509 exp->write_c_string(")");
3512 // Import a type conversion or a struct construction.
3515 Type_conversion_expression::do_import(Import* imp)
3517 imp->require_c_string("convert(");
3518 Type* type = imp->read_type();
3519 imp->require_c_string(", ");
3520 Expression* val = Expression::import_expression(imp);
3521 imp->require_c_string(")");
3522 return Expression::make_cast(type, val, imp->location());
3525 // Make a type cast expression.
3528 Expression::make_cast(Type* type, Expression* val, source_location location)
3530 if (type->is_error_type() || val->is_error_expression())
3531 return Expression::make_error(location);
3532 return new Type_conversion_expression(type, val, location);
3535 // Unary expressions.
3537 class Unary_expression : public Expression
3540 Unary_expression(Operator op, Expression* expr, source_location location)
3541 : Expression(EXPRESSION_UNARY, location),
3542 op_(op), escapes_(true), expr_(expr)
3545 // Return the operator.
3548 { return this->op_; }
3550 // Return the operand.
3553 { return this->expr_; }
3555 // Record that an address expression does not escape.
3557 set_does_not_escape()
3559 gcc_assert(this->op_ == OPERATOR_AND);
3560 this->escapes_ = false;
3563 // Apply unary opcode OP to UVAL, setting VAL. Return true if this
3564 // could be done, false if not.
3566 eval_integer(Operator op, Type* utype, mpz_t uval, mpz_t val,
3569 // Apply unary opcode OP to UVAL, setting VAL. Return true if this
3570 // could be done, false if not.
3572 eval_float(Operator op, mpfr_t uval, mpfr_t val);
3574 // Apply unary opcode OP to UREAL/UIMAG, setting REAL/IMAG. Return
3575 // true if this could be done, false if not.
3577 eval_complex(Operator op, mpfr_t ureal, mpfr_t uimag, mpfr_t real,
3585 do_traverse(Traverse* traverse)
3586 { return Expression::traverse(&this->expr_, traverse); }
3589 do_lower(Gogo*, Named_object*, int);
3592 do_is_constant() const;
3595 do_integer_constant_value(bool, mpz_t, Type**) const;
3598 do_float_constant_value(mpfr_t, Type**) const;
3601 do_complex_constant_value(mpfr_t, mpfr_t, Type**) const;
3607 do_determine_type(const Type_context*);
3610 do_check_types(Gogo*);
3615 return Expression::make_unary(this->op_, this->expr_->copy(),
3620 do_is_addressable() const
3621 { return this->op_ == OPERATOR_MULT; }
3624 do_get_tree(Translate_context*);
3627 do_export(Export*) const;
3630 // The unary operator to apply.
3632 // Normally true. False if this is an address expression which does
3633 // not escape the current function.
3639 // If we are taking the address of a composite literal, and the
3640 // contents are not constant, then we want to make a heap composite
3644 Unary_expression::do_lower(Gogo*, Named_object*, int)
3646 source_location loc = this->location();
3647 Operator op = this->op_;
3648 Expression* expr = this->expr_;
3650 if (op == OPERATOR_MULT && expr->is_type_expression())
3651 return Expression::make_type(Type::make_pointer_type(expr->type()), loc);
3653 // *&x simplifies to x. *(*T)(unsafe.Pointer)(&x) does not require
3654 // moving x to the heap. FIXME: Is it worth doing a real escape
3655 // analysis here? This case is found in math/unsafe.go and is
3656 // therefore worth special casing.
3657 if (op == OPERATOR_MULT)
3659 Expression* e = expr;
3660 while (e->classification() == EXPRESSION_CONVERSION)
3662 Type_conversion_expression* te
3663 = static_cast<Type_conversion_expression*>(e);
3667 if (e->classification() == EXPRESSION_UNARY)
3669 Unary_expression* ue = static_cast<Unary_expression*>(e);
3670 if (ue->op_ == OPERATOR_AND)
3677 ue->set_does_not_escape();
3682 if (op == OPERATOR_PLUS || op == OPERATOR_MINUS
3683 || op == OPERATOR_NOT || op == OPERATOR_XOR)
3685 Expression* ret = NULL;
3690 if (expr->integer_constant_value(false, eval, &etype))
3694 if (Unary_expression::eval_integer(op, etype, eval, val, loc))
3695 ret = Expression::make_integer(&val, etype, loc);
3702 if (op == OPERATOR_PLUS || op == OPERATOR_MINUS)
3707 if (expr->float_constant_value(fval, &ftype))
3711 if (Unary_expression::eval_float(op, fval, val))
3712 ret = Expression::make_float(&val, ftype, loc);
3723 if (expr->complex_constant_value(fval, ival, &ftype))
3729 if (Unary_expression::eval_complex(op, fval, ival, real, imag))
3730 ret = Expression::make_complex(&real, &imag, ftype, loc);
3744 // Return whether a unary expression is a constant.
3747 Unary_expression::do_is_constant() const
3749 if (this->op_ == OPERATOR_MULT)
3751 // Indirecting through a pointer is only constant if the object
3752 // to which the expression points is constant, but we currently
3753 // have no way to determine that.
3756 else if (this->op_ == OPERATOR_AND)
3758 // Taking the address of a variable is constant if it is a
3759 // global variable, not constant otherwise. In other cases
3760 // taking the address is probably not a constant.
3761 Var_expression* ve = this->expr_->var_expression();
3764 Named_object* no = ve->named_object();
3765 return no->is_variable() && no->var_value()->is_global();
3770 return this->expr_->is_constant();
3773 // Apply unary opcode OP to UVAL, setting VAL. UTYPE is the type of
3774 // UVAL, if known; it may be NULL. Return true if this could be done,
3778 Unary_expression::eval_integer(Operator op, Type* utype, mpz_t uval, mpz_t val,
3779 source_location location)
3786 case OPERATOR_MINUS:
3788 return Integer_expression::check_constant(val, utype, location);
3790 mpz_set_ui(val, mpz_cmp_si(uval, 0) == 0 ? 1 : 0);
3794 || utype->integer_type() == NULL
3795 || utype->integer_type()->is_abstract())
3799 // The number of HOST_WIDE_INTs that it takes to represent
3801 size_t count = ((mpz_sizeinbase(uval, 2)
3802 + HOST_BITS_PER_WIDE_INT
3804 / HOST_BITS_PER_WIDE_INT);
3806 unsigned HOST_WIDE_INT* phwi = new unsigned HOST_WIDE_INT[count];
3807 memset(phwi, 0, count * sizeof(HOST_WIDE_INT));
3810 mpz_export(phwi, &ecount, -1, sizeof(HOST_WIDE_INT), 0, 0, uval);
3811 gcc_assert(ecount <= count);
3813 // Trim down to the number of words required by the type.
3814 size_t obits = utype->integer_type()->bits();
3815 if (!utype->integer_type()->is_unsigned())
3817 size_t ocount = ((obits + HOST_BITS_PER_WIDE_INT - 1)
3818 / HOST_BITS_PER_WIDE_INT);
3819 gcc_assert(ocount <= ocount);
3821 for (size_t i = 0; i < ocount; ++i)
3824 size_t clearbits = ocount * HOST_BITS_PER_WIDE_INT - obits;
3826 phwi[ocount - 1] &= (((unsigned HOST_WIDE_INT) (HOST_WIDE_INT) -1)
3829 mpz_import(val, ocount, -1, sizeof(HOST_WIDE_INT), 0, 0, phwi);
3833 return Integer_expression::check_constant(val, utype, location);
3842 // Apply unary opcode OP to UVAL, setting VAL. Return true if this
3843 // could be done, false if not.
3846 Unary_expression::eval_float(Operator op, mpfr_t uval, mpfr_t val)
3851 mpfr_set(val, uval, GMP_RNDN);
3853 case OPERATOR_MINUS:
3854 mpfr_neg(val, uval, GMP_RNDN);
3866 // Apply unary opcode OP to RVAL/IVAL, setting REAL/IMAG. Return true
3867 // if this could be done, false if not.
3870 Unary_expression::eval_complex(Operator op, mpfr_t rval, mpfr_t ival,
3871 mpfr_t real, mpfr_t imag)
3876 mpfr_set(real, rval, GMP_RNDN);
3877 mpfr_set(imag, ival, GMP_RNDN);
3879 case OPERATOR_MINUS:
3880 mpfr_neg(real, rval, GMP_RNDN);
3881 mpfr_neg(imag, ival, GMP_RNDN);
3893 // Return the integral constant value of a unary expression, if it has one.
3896 Unary_expression::do_integer_constant_value(bool iota_is_constant, mpz_t val,
3902 if (!this->expr_->integer_constant_value(iota_is_constant, uval, ptype))
3905 ret = Unary_expression::eval_integer(this->op_, *ptype, uval, val,
3911 // Return the floating point constant value of a unary expression, if
3915 Unary_expression::do_float_constant_value(mpfr_t val, Type** ptype) const
3920 if (!this->expr_->float_constant_value(uval, ptype))
3923 ret = Unary_expression::eval_float(this->op_, uval, val);
3928 // Return the complex constant value of a unary expression, if it has
3932 Unary_expression::do_complex_constant_value(mpfr_t real, mpfr_t imag,
3940 if (!this->expr_->complex_constant_value(rval, ival, ptype))
3943 ret = Unary_expression::eval_complex(this->op_, rval, ival, real, imag);
3949 // Return the type of a unary expression.
3952 Unary_expression::do_type()
3957 case OPERATOR_MINUS:
3960 return this->expr_->type();
3963 return Type::make_pointer_type(this->expr_->type());
3967 Type* subtype = this->expr_->type();
3968 Type* points_to = subtype->points_to();
3969 if (points_to == NULL)
3970 return Type::make_error_type();
3979 // Determine abstract types for a unary expression.
3982 Unary_expression::do_determine_type(const Type_context* context)
3987 case OPERATOR_MINUS:
3990 this->expr_->determine_type(context);
3994 // Taking the address of something.
3996 Type* subtype = (context->type == NULL
3998 : context->type->points_to());
3999 Type_context subcontext(subtype, false);
4000 this->expr_->determine_type(&subcontext);
4005 // Indirecting through a pointer.
4007 Type* subtype = (context->type == NULL
4009 : Type::make_pointer_type(context->type));
4010 Type_context subcontext(subtype, false);
4011 this->expr_->determine_type(&subcontext);
4020 // Check types for a unary expression.
4023 Unary_expression::do_check_types(Gogo*)
4025 Type* type = this->expr_->type();
4026 if (type->is_error_type())
4028 this->set_is_error();
4035 case OPERATOR_MINUS:
4036 if (type->integer_type() == NULL
4037 && type->float_type() == NULL
4038 && type->complex_type() == NULL)
4039 this->report_error(_("expected numeric type"));
4044 if (type->integer_type() == NULL
4045 && !type->is_boolean_type())
4046 this->report_error(_("expected integer or boolean type"));
4050 if (!this->expr_->is_addressable())
4051 this->report_error(_("invalid operand for unary %<&%>"));
4053 this->expr_->address_taken(this->escapes_);
4057 // Indirecting through a pointer.
4058 if (type->points_to() == NULL)
4059 this->report_error(_("expected pointer"));
4067 // Get a tree for a unary expression.
4070 Unary_expression::do_get_tree(Translate_context* context)
4072 tree expr = this->expr_->get_tree(context);
4073 if (expr == error_mark_node)
4074 return error_mark_node;
4076 source_location loc = this->location();
4082 case OPERATOR_MINUS:
4084 tree type = TREE_TYPE(expr);
4085 tree compute_type = excess_precision_type(type);
4086 if (compute_type != NULL_TREE)
4087 expr = ::convert(compute_type, expr);
4088 tree ret = fold_build1_loc(loc, NEGATE_EXPR,
4089 (compute_type != NULL_TREE
4093 if (compute_type != NULL_TREE)
4094 ret = ::convert(type, ret);
4099 if (TREE_CODE(TREE_TYPE(expr)) == BOOLEAN_TYPE)
4100 return fold_build1_loc(loc, TRUTH_NOT_EXPR, TREE_TYPE(expr), expr);
4102 return fold_build2_loc(loc, NE_EXPR, boolean_type_node, expr,
4103 build_int_cst(TREE_TYPE(expr), 0));
4106 return fold_build1_loc(loc, BIT_NOT_EXPR, TREE_TYPE(expr), expr);
4109 // We should not see a non-constant constructor here; cases
4110 // where we would see one should have been moved onto the heap
4111 // at parse time. Taking the address of a nonconstant
4112 // constructor will not do what the programmer expects.
4113 gcc_assert(TREE_CODE(expr) != CONSTRUCTOR || TREE_CONSTANT(expr));
4114 gcc_assert(TREE_CODE(expr) != ADDR_EXPR);
4116 // Build a decl for a constant constructor.
4117 if (TREE_CODE(expr) == CONSTRUCTOR && TREE_CONSTANT(expr))
4119 tree decl = build_decl(this->location(), VAR_DECL,
4120 create_tmp_var_name("C"), TREE_TYPE(expr));
4121 DECL_EXTERNAL(decl) = 0;
4122 TREE_PUBLIC(decl) = 0;
4123 TREE_READONLY(decl) = 1;
4124 TREE_CONSTANT(decl) = 1;
4125 TREE_STATIC(decl) = 1;
4126 TREE_ADDRESSABLE(decl) = 1;
4127 DECL_ARTIFICIAL(decl) = 1;
4128 DECL_INITIAL(decl) = expr;
4129 rest_of_decl_compilation(decl, 1, 0);
4133 return build_fold_addr_expr_loc(loc, expr);
4137 gcc_assert(POINTER_TYPE_P(TREE_TYPE(expr)));
4139 // If we are dereferencing the pointer to a large struct, we
4140 // need to check for nil. We don't bother to check for small
4141 // structs because we expect the system to crash on a nil
4142 // pointer dereference.
4143 HOST_WIDE_INT s = int_size_in_bytes(TREE_TYPE(TREE_TYPE(expr)));
4144 if (s == -1 || s >= 4096)
4147 expr = save_expr(expr);
4148 tree compare = fold_build2_loc(loc, EQ_EXPR, boolean_type_node,
4150 fold_convert(TREE_TYPE(expr),
4151 null_pointer_node));
4152 tree crash = Gogo::runtime_error(RUNTIME_ERROR_NIL_DEREFERENCE,
4154 expr = fold_build2_loc(loc, COMPOUND_EXPR, TREE_TYPE(expr),
4155 build3(COND_EXPR, void_type_node,
4156 compare, crash, NULL_TREE),
4160 // If the type of EXPR is a recursive pointer type, then we
4161 // need to insert a cast before indirecting.
4162 if (TREE_TYPE(TREE_TYPE(expr)) == ptr_type_node)
4164 Type* pt = this->expr_->type()->points_to();
4165 tree ind = pt->get_tree(context->gogo());
4166 expr = fold_convert_loc(loc, build_pointer_type(ind), expr);
4169 return build_fold_indirect_ref_loc(loc, expr);
4177 // Export a unary expression.
4180 Unary_expression::do_export(Export* exp) const
4185 exp->write_c_string("+ ");
4187 case OPERATOR_MINUS:
4188 exp->write_c_string("- ");
4191 exp->write_c_string("! ");
4194 exp->write_c_string("^ ");
4201 this->expr_->export_expression(exp);
4204 // Import a unary expression.
4207 Unary_expression::do_import(Import* imp)
4210 switch (imp->get_char())
4216 op = OPERATOR_MINUS;
4227 imp->require_c_string(" ");
4228 Expression* expr = Expression::import_expression(imp);
4229 return Expression::make_unary(op, expr, imp->location());
4232 // Make a unary expression.
4235 Expression::make_unary(Operator op, Expression* expr, source_location location)
4237 return new Unary_expression(op, expr, location);
4240 // If this is an indirection through a pointer, return the expression
4241 // being pointed through. Otherwise return this.
4246 if (this->classification_ == EXPRESSION_UNARY)
4248 Unary_expression* ue = static_cast<Unary_expression*>(this);
4249 if (ue->op() == OPERATOR_MULT)
4250 return ue->operand();
4255 // Class Binary_expression.
4260 Binary_expression::do_traverse(Traverse* traverse)
4262 int t = Expression::traverse(&this->left_, traverse);
4263 if (t == TRAVERSE_EXIT)
4264 return TRAVERSE_EXIT;
4265 return Expression::traverse(&this->right_, traverse);
4268 // Compare integer constants according to OP.
4271 Binary_expression::compare_integer(Operator op, mpz_t left_val,
4274 int i = mpz_cmp(left_val, right_val);
4279 case OPERATOR_NOTEQ:
4294 // Compare floating point constants according to OP.
4297 Binary_expression::compare_float(Operator op, Type* type, mpfr_t left_val,
4302 i = mpfr_cmp(left_val, right_val);
4306 mpfr_init_set(lv, left_val, GMP_RNDN);
4308 mpfr_init_set(rv, right_val, GMP_RNDN);
4309 Float_expression::constrain_float(lv, type);
4310 Float_expression::constrain_float(rv, type);
4311 i = mpfr_cmp(lv, rv);
4319 case OPERATOR_NOTEQ:
4334 // Compare complex constants according to OP. Complex numbers may
4335 // only be compared for equality.
4338 Binary_expression::compare_complex(Operator op, Type* type,
4339 mpfr_t left_real, mpfr_t left_imag,
4340 mpfr_t right_real, mpfr_t right_imag)
4344 is_equal = (mpfr_cmp(left_real, right_real) == 0
4345 && mpfr_cmp(left_imag, right_imag) == 0);
4350 mpfr_init_set(lr, left_real, GMP_RNDN);
4351 mpfr_init_set(li, left_imag, GMP_RNDN);
4354 mpfr_init_set(rr, right_real, GMP_RNDN);
4355 mpfr_init_set(ri, right_imag, GMP_RNDN);
4356 Complex_expression::constrain_complex(lr, li, type);
4357 Complex_expression::constrain_complex(rr, ri, type);
4358 is_equal = mpfr_cmp(lr, rr) == 0 && mpfr_cmp(li, ri) == 0;
4368 case OPERATOR_NOTEQ:
4375 // Apply binary opcode OP to LEFT_VAL and RIGHT_VAL, setting VAL.
4376 // LEFT_TYPE is the type of LEFT_VAL, RIGHT_TYPE is the type of
4377 // RIGHT_VAL; LEFT_TYPE and/or RIGHT_TYPE may be NULL. Return true if
4378 // this could be done, false if not.
4381 Binary_expression::eval_integer(Operator op, Type* left_type, mpz_t left_val,
4382 Type* right_type, mpz_t right_val,
4383 source_location location, mpz_t val)
4385 bool is_shift_op = false;
4389 case OPERATOR_ANDAND:
4391 case OPERATOR_NOTEQ:
4396 // These return boolean values. We should probably handle them
4397 // anyhow in case a type conversion is used on the result.
4400 mpz_add(val, left_val, right_val);
4402 case OPERATOR_MINUS:
4403 mpz_sub(val, left_val, right_val);
4406 mpz_ior(val, left_val, right_val);
4409 mpz_xor(val, left_val, right_val);
4412 mpz_mul(val, left_val, right_val);
4415 if (mpz_sgn(right_val) != 0)
4416 mpz_tdiv_q(val, left_val, right_val);
4419 error_at(location, "division by zero");
4425 if (mpz_sgn(right_val) != 0)
4426 mpz_tdiv_r(val, left_val, right_val);
4429 error_at(location, "division by zero");
4434 case OPERATOR_LSHIFT:
4436 unsigned long shift = mpz_get_ui(right_val);
4437 if (mpz_cmp_ui(right_val, shift) != 0 || shift > 0x100000)
4439 error_at(location, "shift count overflow");
4443 mpz_mul_2exp(val, left_val, shift);
4448 case OPERATOR_RSHIFT:
4450 unsigned long shift = mpz_get_ui(right_val);
4451 if (mpz_cmp_ui(right_val, shift) != 0)
4453 error_at(location, "shift count overflow");
4457 if (mpz_cmp_ui(left_val, 0) >= 0)
4458 mpz_tdiv_q_2exp(val, left_val, shift);
4460 mpz_fdiv_q_2exp(val, left_val, shift);
4466 mpz_and(val, left_val, right_val);
4468 case OPERATOR_BITCLEAR:
4472 mpz_com(tval, right_val);
4473 mpz_and(val, left_val, tval);
4481 Type* type = left_type;
4486 else if (type != right_type && right_type != NULL)
4488 if (type->is_abstract())
4490 else if (!right_type->is_abstract())
4492 // This look like a type error which should be diagnosed
4493 // elsewhere. Don't do anything here, to avoid an
4494 // unhelpful chain of error messages.
4500 if (type != NULL && !type->is_abstract())
4502 // We have to check the operands too, as we have implicitly
4503 // coerced them to TYPE.
4504 if ((type != left_type
4505 && !Integer_expression::check_constant(left_val, type, location))
4507 && type != right_type
4508 && !Integer_expression::check_constant(right_val, type,
4510 || !Integer_expression::check_constant(val, type, location))
4517 // Apply binary opcode OP to LEFT_VAL and RIGHT_VAL, setting VAL.
4518 // Return true if this could be done, false if not.
4521 Binary_expression::eval_float(Operator op, Type* left_type, mpfr_t left_val,
4522 Type* right_type, mpfr_t right_val,
4523 mpfr_t val, source_location location)
4528 case OPERATOR_ANDAND:
4530 case OPERATOR_NOTEQ:
4535 // These return boolean values. We should probably handle them
4536 // anyhow in case a type conversion is used on the result.
4539 mpfr_add(val, left_val, right_val, GMP_RNDN);
4541 case OPERATOR_MINUS:
4542 mpfr_sub(val, left_val, right_val, GMP_RNDN);
4547 case OPERATOR_BITCLEAR:
4550 mpfr_mul(val, left_val, right_val, GMP_RNDN);
4553 if (mpfr_zero_p(right_val))
4554 error_at(location, "division by zero");
4555 mpfr_div(val, left_val, right_val, GMP_RNDN);
4559 case OPERATOR_LSHIFT:
4560 case OPERATOR_RSHIFT:
4566 Type* type = left_type;
4569 else if (type != right_type && right_type != NULL)
4571 if (type->is_abstract())
4573 else if (!right_type->is_abstract())
4575 // This looks like a type error which should be diagnosed
4576 // elsewhere. Don't do anything here, to avoid an unhelpful
4577 // chain of error messages.
4582 if (type != NULL && !type->is_abstract())
4584 if ((type != left_type
4585 && !Float_expression::check_constant(left_val, type, location))
4586 || (type != right_type
4587 && !Float_expression::check_constant(right_val, type,
4589 || !Float_expression::check_constant(val, type, location))
4590 mpfr_set_ui(val, 0, GMP_RNDN);
4596 // Apply binary opcode OP to LEFT_REAL/LEFT_IMAG and
4597 // RIGHT_REAL/RIGHT_IMAG, setting REAL/IMAG. Return true if this
4598 // could be done, false if not.
4601 Binary_expression::eval_complex(Operator op, Type* left_type,
4602 mpfr_t left_real, mpfr_t left_imag,
4604 mpfr_t right_real, mpfr_t right_imag,
4605 mpfr_t real, mpfr_t imag,
4606 source_location location)
4611 case OPERATOR_ANDAND:
4613 case OPERATOR_NOTEQ:
4618 // These return boolean values and must be handled differently.
4621 mpfr_add(real, left_real, right_real, GMP_RNDN);
4622 mpfr_add(imag, left_imag, right_imag, GMP_RNDN);
4624 case OPERATOR_MINUS:
4625 mpfr_sub(real, left_real, right_real, GMP_RNDN);
4626 mpfr_sub(imag, left_imag, right_imag, GMP_RNDN);
4631 case OPERATOR_BITCLEAR:
4635 // You might think that multiplying two complex numbers would
4636 // be simple, and you would be right, until you start to think
4637 // about getting the right answer for infinity. If one
4638 // operand here is infinity and the other is anything other
4639 // than zero or NaN, then we are going to wind up subtracting
4640 // two infinity values. That will give us a NaN, but the
4641 // correct answer is infinity.
4645 mpfr_mul(lrrr, left_real, right_real, GMP_RNDN);
4649 mpfr_mul(lrri, left_real, right_imag, GMP_RNDN);
4653 mpfr_mul(lirr, left_imag, right_real, GMP_RNDN);
4657 mpfr_mul(liri, left_imag, right_imag, GMP_RNDN);
4659 mpfr_sub(real, lrrr, liri, GMP_RNDN);
4660 mpfr_add(imag, lrri, lirr, GMP_RNDN);
4662 // If we get NaN on both sides, check whether it should really
4663 // be infinity. The rule is that if either side of the
4664 // complex number is infinity, then the whole value is
4665 // infinity, even if the other side is NaN. So the only case
4666 // we have to fix is the one in which both sides are NaN.
4667 if (mpfr_nan_p(real) && mpfr_nan_p(imag)
4668 && (!mpfr_nan_p(left_real) || !mpfr_nan_p(left_imag))
4669 && (!mpfr_nan_p(right_real) || !mpfr_nan_p(right_imag)))
4671 bool is_infinity = false;
4675 mpfr_init_set(lr, left_real, GMP_RNDN);
4676 mpfr_init_set(li, left_imag, GMP_RNDN);
4680 mpfr_init_set(rr, right_real, GMP_RNDN);
4681 mpfr_init_set(ri, right_imag, GMP_RNDN);
4683 // If the left side is infinity, then the result is
4685 if (mpfr_inf_p(lr) || mpfr_inf_p(li))
4687 mpfr_set_ui(lr, mpfr_inf_p(lr) ? 1 : 0, GMP_RNDN);
4688 mpfr_copysign(lr, lr, left_real, GMP_RNDN);
4689 mpfr_set_ui(li, mpfr_inf_p(li) ? 1 : 0, GMP_RNDN);
4690 mpfr_copysign(li, li, left_imag, GMP_RNDN);
4693 mpfr_set_ui(rr, 0, GMP_RNDN);
4694 mpfr_copysign(rr, rr, right_real, GMP_RNDN);
4698 mpfr_set_ui(ri, 0, GMP_RNDN);
4699 mpfr_copysign(ri, ri, right_imag, GMP_RNDN);
4704 // If the right side is infinity, then the result is
4706 if (mpfr_inf_p(rr) || mpfr_inf_p(ri))
4708 mpfr_set_ui(rr, mpfr_inf_p(rr) ? 1 : 0, GMP_RNDN);
4709 mpfr_copysign(rr, rr, right_real, GMP_RNDN);
4710 mpfr_set_ui(ri, mpfr_inf_p(ri) ? 1 : 0, GMP_RNDN);
4711 mpfr_copysign(ri, ri, right_imag, GMP_RNDN);
4714 mpfr_set_ui(lr, 0, GMP_RNDN);
4715 mpfr_copysign(lr, lr, left_real, GMP_RNDN);
4719 mpfr_set_ui(li, 0, GMP_RNDN);
4720 mpfr_copysign(li, li, left_imag, GMP_RNDN);
4725 // If we got an overflow in the intermediate computations,
4726 // then the result is infinity.
4728 && (mpfr_inf_p(lrrr) || mpfr_inf_p(lrri)
4729 || mpfr_inf_p(lirr) || mpfr_inf_p(liri)))
4733 mpfr_set_ui(lr, 0, GMP_RNDN);
4734 mpfr_copysign(lr, lr, left_real, GMP_RNDN);
4738 mpfr_set_ui(li, 0, GMP_RNDN);
4739 mpfr_copysign(li, li, left_imag, GMP_RNDN);
4743 mpfr_set_ui(rr, 0, GMP_RNDN);
4744 mpfr_copysign(rr, rr, right_real, GMP_RNDN);
4748 mpfr_set_ui(ri, 0, GMP_RNDN);
4749 mpfr_copysign(ri, ri, right_imag, GMP_RNDN);
4756 mpfr_mul(lrrr, lr, rr, GMP_RNDN);
4757 mpfr_mul(lrri, lr, ri, GMP_RNDN);
4758 mpfr_mul(lirr, li, rr, GMP_RNDN);
4759 mpfr_mul(liri, li, ri, GMP_RNDN);
4760 mpfr_sub(real, lrrr, liri, GMP_RNDN);
4761 mpfr_add(imag, lrri, lirr, GMP_RNDN);
4762 mpfr_set_inf(real, mpfr_sgn(real));
4763 mpfr_set_inf(imag, mpfr_sgn(imag));
4780 // For complex division we want to avoid having an
4781 // intermediate overflow turn the whole result in a NaN. We
4782 // scale the values to try to avoid this.
4784 if (mpfr_zero_p(right_real) && mpfr_zero_p(right_imag))
4785 error_at(location, "division by zero");
4791 mpfr_abs(rra, right_real, GMP_RNDN);
4792 mpfr_abs(ria, right_imag, GMP_RNDN);
4795 mpfr_max(t, rra, ria, GMP_RNDN);
4799 mpfr_init_set(rr, right_real, GMP_RNDN);
4800 mpfr_init_set(ri, right_imag, GMP_RNDN);
4802 if (!mpfr_inf_p(t) && !mpfr_nan_p(t) && !mpfr_zero_p(t))
4804 ilogbw = mpfr_get_exp(t);
4805 mpfr_mul_2si(rr, rr, - ilogbw, GMP_RNDN);
4806 mpfr_mul_2si(ri, ri, - ilogbw, GMP_RNDN);
4811 mpfr_mul(denom, rr, rr, GMP_RNDN);
4812 mpfr_mul(t, ri, ri, GMP_RNDN);
4813 mpfr_add(denom, denom, t, GMP_RNDN);
4815 mpfr_mul(real, left_real, rr, GMP_RNDN);
4816 mpfr_mul(t, left_imag, ri, GMP_RNDN);
4817 mpfr_add(real, real, t, GMP_RNDN);
4818 mpfr_div(real, real, denom, GMP_RNDN);
4819 mpfr_mul_2si(real, real, - ilogbw, GMP_RNDN);
4821 mpfr_mul(imag, left_imag, rr, GMP_RNDN);
4822 mpfr_mul(t, left_real, ri, GMP_RNDN);
4823 mpfr_sub(imag, imag, t, GMP_RNDN);
4824 mpfr_div(imag, imag, denom, GMP_RNDN);
4825 mpfr_mul_2si(imag, imag, - ilogbw, GMP_RNDN);
4827 // If we wind up with NaN on both sides, check whether we
4828 // should really have infinity. The rule is that if either
4829 // side of the complex number is infinity, then the whole
4830 // value is infinity, even if the other side is NaN. So the
4831 // only case we have to fix is the one in which both sides are
4833 if (mpfr_nan_p(real) && mpfr_nan_p(imag)
4834 && (!mpfr_nan_p(left_real) || !mpfr_nan_p(left_imag))
4835 && (!mpfr_nan_p(right_real) || !mpfr_nan_p(right_imag)))
4837 if (mpfr_zero_p(denom))
4839 mpfr_set_inf(real, mpfr_sgn(rr));
4840 mpfr_mul(real, real, left_real, GMP_RNDN);
4841 mpfr_set_inf(imag, mpfr_sgn(rr));
4842 mpfr_mul(imag, imag, left_imag, GMP_RNDN);
4844 else if ((mpfr_inf_p(left_real) || mpfr_inf_p(left_imag))
4845 && mpfr_number_p(rr) && mpfr_number_p(ri))
4847 mpfr_set_ui(t, mpfr_inf_p(left_real) ? 1 : 0, GMP_RNDN);
4848 mpfr_copysign(t, t, left_real, GMP_RNDN);
4851 mpfr_init_set_ui(t2, mpfr_inf_p(left_imag) ? 1 : 0, GMP_RNDN);
4852 mpfr_copysign(t2, t2, left_imag, GMP_RNDN);
4856 mpfr_mul(t3, t, rr, GMP_RNDN);
4860 mpfr_mul(t4, t2, ri, GMP_RNDN);
4862 mpfr_add(t3, t3, t4, GMP_RNDN);
4863 mpfr_set_inf(real, mpfr_sgn(t3));
4865 mpfr_mul(t3, t2, rr, GMP_RNDN);
4866 mpfr_mul(t4, t, ri, GMP_RNDN);
4867 mpfr_sub(t3, t3, t4, GMP_RNDN);
4868 mpfr_set_inf(imag, mpfr_sgn(t3));
4874 else if ((mpfr_inf_p(right_real) || mpfr_inf_p(right_imag))
4875 && mpfr_number_p(left_real) && mpfr_number_p(left_imag))
4877 mpfr_set_ui(t, mpfr_inf_p(rr) ? 1 : 0, GMP_RNDN);
4878 mpfr_copysign(t, t, rr, GMP_RNDN);
4881 mpfr_init_set_ui(t2, mpfr_inf_p(ri) ? 1 : 0, GMP_RNDN);
4882 mpfr_copysign(t2, t2, ri, GMP_RNDN);
4886 mpfr_mul(t3, left_real, t, GMP_RNDN);
4890 mpfr_mul(t4, left_imag, t2, GMP_RNDN);
4892 mpfr_add(t3, t3, t4, GMP_RNDN);
4893 mpfr_set_ui(real, 0, GMP_RNDN);
4894 mpfr_mul(real, real, t3, GMP_RNDN);
4896 mpfr_mul(t3, left_imag, t, GMP_RNDN);
4897 mpfr_mul(t4, left_real, t2, GMP_RNDN);
4898 mpfr_sub(t3, t3, t4, GMP_RNDN);
4899 mpfr_set_ui(imag, 0, GMP_RNDN);
4900 mpfr_mul(imag, imag, t3, GMP_RNDN);
4918 case OPERATOR_LSHIFT:
4919 case OPERATOR_RSHIFT:
4925 Type* type = left_type;
4928 else if (type != right_type && right_type != NULL)
4930 if (type->is_abstract())
4932 else if (!right_type->is_abstract())
4934 // This looks like a type error which should be diagnosed
4935 // elsewhere. Don't do anything here, to avoid an unhelpful
4936 // chain of error messages.
4941 if (type != NULL && !type->is_abstract())
4943 if ((type != left_type
4944 && !Complex_expression::check_constant(left_real, left_imag,
4946 || (type != right_type
4947 && !Complex_expression::check_constant(right_real, right_imag,
4949 || !Complex_expression::check_constant(real, imag, type,
4952 mpfr_set_ui(real, 0, GMP_RNDN);
4953 mpfr_set_ui(imag, 0, GMP_RNDN);
4960 // Lower a binary expression. We have to evaluate constant
4961 // expressions now, in order to implement Go's unlimited precision
4965 Binary_expression::do_lower(Gogo*, Named_object*, int)
4967 source_location location = this->location();
4968 Operator op = this->op_;
4969 Expression* left = this->left_;
4970 Expression* right = this->right_;
4972 const bool is_comparison = (op == OPERATOR_EQEQ
4973 || op == OPERATOR_NOTEQ
4974 || op == OPERATOR_LT
4975 || op == OPERATOR_LE
4976 || op == OPERATOR_GT
4977 || op == OPERATOR_GE);
4979 // Integer constant expressions.
4985 mpz_init(right_val);
4987 if (left->integer_constant_value(false, left_val, &left_type)
4988 && right->integer_constant_value(false, right_val, &right_type))
4990 Expression* ret = NULL;
4991 if (left_type != right_type
4992 && left_type != NULL
4993 && right_type != NULL
4994 && left_type->base() != right_type->base()
4995 && op != OPERATOR_LSHIFT
4996 && op != OPERATOR_RSHIFT)
4998 // May be a type error--let it be diagnosed later.
5000 else if (is_comparison)
5002 bool b = Binary_expression::compare_integer(op, left_val,
5004 ret = Expression::make_cast(Type::lookup_bool_type(),
5005 Expression::make_boolean(b, location),
5013 if (Binary_expression::eval_integer(op, left_type, left_val,
5014 right_type, right_val,
5017 gcc_assert(op != OPERATOR_OROR && op != OPERATOR_ANDAND);
5019 if (op == OPERATOR_LSHIFT || op == OPERATOR_RSHIFT)
5021 else if (left_type == NULL)
5023 else if (right_type == NULL)
5025 else if (!left_type->is_abstract()
5026 && left_type->named_type() != NULL)
5028 else if (!right_type->is_abstract()
5029 && right_type->named_type() != NULL)
5031 else if (!left_type->is_abstract())
5033 else if (!right_type->is_abstract())
5035 else if (left_type->float_type() != NULL)
5037 else if (right_type->float_type() != NULL)
5039 else if (left_type->complex_type() != NULL)
5041 else if (right_type->complex_type() != NULL)
5045 ret = Expression::make_integer(&val, type, location);
5053 mpz_clear(right_val);
5054 mpz_clear(left_val);
5058 mpz_clear(right_val);
5059 mpz_clear(left_val);
5062 // Floating point constant expressions.
5065 mpfr_init(left_val);
5068 mpfr_init(right_val);
5070 if (left->float_constant_value(left_val, &left_type)
5071 && right->float_constant_value(right_val, &right_type))
5073 Expression* ret = NULL;
5074 if (left_type != right_type
5075 && left_type != NULL
5076 && right_type != NULL
5077 && left_type->base() != right_type->base()
5078 && op != OPERATOR_LSHIFT
5079 && op != OPERATOR_RSHIFT)
5081 // May be a type error--let it be diagnosed later.
5083 else if (is_comparison)
5085 bool b = Binary_expression::compare_float(op,
5089 left_val, right_val);
5090 ret = Expression::make_boolean(b, location);
5097 if (Binary_expression::eval_float(op, left_type, left_val,
5098 right_type, right_val, val,
5101 gcc_assert(op != OPERATOR_OROR && op != OPERATOR_ANDAND
5102 && op != OPERATOR_LSHIFT && op != OPERATOR_RSHIFT);
5104 if (left_type == NULL)
5106 else if (right_type == NULL)
5108 else if (!left_type->is_abstract()
5109 && left_type->named_type() != NULL)
5111 else if (!right_type->is_abstract()
5112 && right_type->named_type() != NULL)
5114 else if (!left_type->is_abstract())
5116 else if (!right_type->is_abstract())
5118 else if (left_type->float_type() != NULL)
5120 else if (right_type->float_type() != NULL)
5124 ret = Expression::make_float(&val, type, location);
5132 mpfr_clear(right_val);
5133 mpfr_clear(left_val);
5137 mpfr_clear(right_val);
5138 mpfr_clear(left_val);
5141 // Complex constant expressions.
5145 mpfr_init(left_real);
5146 mpfr_init(left_imag);
5151 mpfr_init(right_real);
5152 mpfr_init(right_imag);
5155 if (left->complex_constant_value(left_real, left_imag, &left_type)
5156 && right->complex_constant_value(right_real, right_imag, &right_type))
5158 Expression* ret = NULL;
5159 if (left_type != right_type
5160 && left_type != NULL
5161 && right_type != NULL
5162 && left_type->base() != right_type->base())
5164 // May be a type error--let it be diagnosed later.
5166 else if (op == OPERATOR_EQEQ || op == OPERATOR_NOTEQ)
5168 bool b = Binary_expression::compare_complex(op,
5176 ret = Expression::make_boolean(b, location);
5185 if (Binary_expression::eval_complex(op, left_type,
5186 left_real, left_imag,
5188 right_real, right_imag,
5192 gcc_assert(op != OPERATOR_OROR && op != OPERATOR_ANDAND
5193 && op != OPERATOR_LSHIFT && op != OPERATOR_RSHIFT);
5195 if (left_type == NULL)
5197 else if (right_type == NULL)
5199 else if (!left_type->is_abstract()
5200 && left_type->named_type() != NULL)
5202 else if (!right_type->is_abstract()
5203 && right_type->named_type() != NULL)
5205 else if (!left_type->is_abstract())
5207 else if (!right_type->is_abstract())
5209 else if (left_type->complex_type() != NULL)
5211 else if (right_type->complex_type() != NULL)
5215 ret = Expression::make_complex(&real, &imag, type,
5224 mpfr_clear(left_real);
5225 mpfr_clear(left_imag);
5226 mpfr_clear(right_real);
5227 mpfr_clear(right_imag);
5232 mpfr_clear(left_real);
5233 mpfr_clear(left_imag);
5234 mpfr_clear(right_real);
5235 mpfr_clear(right_imag);
5238 // String constant expressions.
5239 if (op == OPERATOR_PLUS
5240 && left->type()->is_string_type()
5241 && right->type()->is_string_type())
5243 std::string left_string;
5244 std::string right_string;
5245 if (left->string_constant_value(&left_string)
5246 && right->string_constant_value(&right_string))
5247 return Expression::make_string(left_string + right_string, location);
5253 // Return the integer constant value, if it has one.
5256 Binary_expression::do_integer_constant_value(bool iota_is_constant, mpz_t val,
5262 if (!this->left_->integer_constant_value(iota_is_constant, left_val,
5265 mpz_clear(left_val);
5270 mpz_init(right_val);
5272 if (!this->right_->integer_constant_value(iota_is_constant, right_val,
5275 mpz_clear(right_val);
5276 mpz_clear(left_val);
5281 if (left_type != right_type
5282 && left_type != NULL
5283 && right_type != NULL
5284 && left_type->base() != right_type->base()
5285 && this->op_ != OPERATOR_RSHIFT
5286 && this->op_ != OPERATOR_LSHIFT)
5289 ret = Binary_expression::eval_integer(this->op_, left_type, left_val,
5290 right_type, right_val,
5291 this->location(), val);
5293 mpz_clear(right_val);
5294 mpz_clear(left_val);
5302 // Return the floating point constant value, if it has one.
5305 Binary_expression::do_float_constant_value(mpfr_t val, Type** ptype) const
5308 mpfr_init(left_val);
5310 if (!this->left_->float_constant_value(left_val, &left_type))
5312 mpfr_clear(left_val);
5317 mpfr_init(right_val);
5319 if (!this->right_->float_constant_value(right_val, &right_type))
5321 mpfr_clear(right_val);
5322 mpfr_clear(left_val);
5327 if (left_type != right_type
5328 && left_type != NULL
5329 && right_type != NULL
5330 && left_type->base() != right_type->base())
5333 ret = Binary_expression::eval_float(this->op_, left_type, left_val,
5334 right_type, right_val,
5335 val, this->location());
5337 mpfr_clear(left_val);
5338 mpfr_clear(right_val);
5346 // Return the complex constant value, if it has one.
5349 Binary_expression::do_complex_constant_value(mpfr_t real, mpfr_t imag,
5354 mpfr_init(left_real);
5355 mpfr_init(left_imag);
5357 if (!this->left_->complex_constant_value(left_real, left_imag, &left_type))
5359 mpfr_clear(left_real);
5360 mpfr_clear(left_imag);
5366 mpfr_init(right_real);
5367 mpfr_init(right_imag);
5369 if (!this->right_->complex_constant_value(right_real, right_imag,
5372 mpfr_clear(left_real);
5373 mpfr_clear(left_imag);
5374 mpfr_clear(right_real);
5375 mpfr_clear(right_imag);
5380 if (left_type != right_type
5381 && left_type != NULL
5382 && right_type != NULL
5383 && left_type->base() != right_type->base())
5386 ret = Binary_expression::eval_complex(this->op_, left_type,
5387 left_real, left_imag,
5389 right_real, right_imag,
5392 mpfr_clear(left_real);
5393 mpfr_clear(left_imag);
5394 mpfr_clear(right_real);
5395 mpfr_clear(right_imag);
5403 // Note that the value is being discarded.
5406 Binary_expression::do_discarding_value()
5408 if (this->op_ == OPERATOR_OROR || this->op_ == OPERATOR_ANDAND)
5409 this->right_->discarding_value();
5411 this->warn_about_unused_value();
5417 Binary_expression::do_type()
5419 if (this->classification() == EXPRESSION_ERROR)
5420 return Type::make_error_type();
5425 case OPERATOR_ANDAND:
5427 case OPERATOR_NOTEQ:
5432 return Type::lookup_bool_type();
5435 case OPERATOR_MINUS:
5442 case OPERATOR_BITCLEAR:
5444 Type* left_type = this->left_->type();
5445 Type* right_type = this->right_->type();
5446 if (left_type->is_error_type())
5448 else if (right_type->is_error_type())
5450 else if (!Type::are_compatible_for_binop(left_type, right_type))
5452 this->report_error(_("incompatible types in binary expression"));
5453 return Type::make_error_type();
5455 else if (!left_type->is_abstract() && left_type->named_type() != NULL)
5457 else if (!right_type->is_abstract() && right_type->named_type() != NULL)
5459 else if (!left_type->is_abstract())
5461 else if (!right_type->is_abstract())
5463 else if (left_type->complex_type() != NULL)
5465 else if (right_type->complex_type() != NULL)
5467 else if (left_type->float_type() != NULL)
5469 else if (right_type->float_type() != NULL)
5475 case OPERATOR_LSHIFT:
5476 case OPERATOR_RSHIFT:
5477 return this->left_->type();
5484 // Set type for a binary expression.
5487 Binary_expression::do_determine_type(const Type_context* context)
5489 Type* tleft = this->left_->type();
5490 Type* tright = this->right_->type();
5492 // Both sides should have the same type, except for the shift
5493 // operations. For a comparison, we should ignore the incoming
5496 bool is_shift_op = (this->op_ == OPERATOR_LSHIFT
5497 || this->op_ == OPERATOR_RSHIFT);
5499 bool is_comparison = (this->op_ == OPERATOR_EQEQ
5500 || this->op_ == OPERATOR_NOTEQ
5501 || this->op_ == OPERATOR_LT
5502 || this->op_ == OPERATOR_LE
5503 || this->op_ == OPERATOR_GT
5504 || this->op_ == OPERATOR_GE);
5506 Type_context subcontext(*context);
5510 // In a comparison, the context does not determine the types of
5512 subcontext.type = NULL;
5515 // Set the context for the left hand operand.
5518 // The right hand operand plays no role in determining the type
5519 // of the left hand operand. A shift of an abstract integer in
5520 // a string context gets special treatment, which may be a
5522 if (subcontext.type != NULL
5523 && subcontext.type->is_string_type()
5524 && tleft->is_abstract())
5525 error_at(this->location(), "shift of non-integer operand");
5527 else if (!tleft->is_abstract())
5528 subcontext.type = tleft;
5529 else if (!tright->is_abstract())
5530 subcontext.type = tright;
5531 else if (subcontext.type == NULL)
5533 if ((tleft->integer_type() != NULL && tright->integer_type() != NULL)
5534 || (tleft->float_type() != NULL && tright->float_type() != NULL)
5535 || (tleft->complex_type() != NULL && tright->complex_type() != NULL))
5537 // Both sides have an abstract integer, abstract float, or
5538 // abstract complex type. Just let CONTEXT determine
5539 // whether they may remain abstract or not.
5541 else if (tleft->complex_type() != NULL)
5542 subcontext.type = tleft;
5543 else if (tright->complex_type() != NULL)
5544 subcontext.type = tright;
5545 else if (tleft->float_type() != NULL)
5546 subcontext.type = tleft;
5547 else if (tright->float_type() != NULL)
5548 subcontext.type = tright;
5550 subcontext.type = tleft;
5552 if (subcontext.type != NULL && !context->may_be_abstract)
5553 subcontext.type = subcontext.type->make_non_abstract_type();
5556 this->left_->determine_type(&subcontext);
5558 // The context for the right hand operand is the same as for the
5559 // left hand operand, except for a shift operator.
5562 subcontext.type = Type::lookup_integer_type("uint");
5563 subcontext.may_be_abstract = false;
5566 this->right_->determine_type(&subcontext);
5569 // Report an error if the binary operator OP does not support TYPE.
5570 // Return whether the operation is OK. This should not be used for
5574 Binary_expression::check_operator_type(Operator op, Type* type,
5575 source_location location)
5580 case OPERATOR_ANDAND:
5581 if (!type->is_boolean_type())
5583 error_at(location, "expected boolean type");
5589 case OPERATOR_NOTEQ:
5590 if (type->integer_type() == NULL
5591 && type->float_type() == NULL
5592 && type->complex_type() == NULL
5593 && !type->is_string_type()
5594 && type->points_to() == NULL
5595 && !type->is_nil_type()
5596 && !type->is_boolean_type()
5597 && type->interface_type() == NULL
5598 && (type->array_type() == NULL
5599 || type->array_type()->length() != NULL)
5600 && type->map_type() == NULL
5601 && type->channel_type() == NULL
5602 && type->function_type() == NULL)
5605 ("expected integer, floating, complex, string, pointer, "
5606 "boolean, interface, slice, map, channel, "
5607 "or function type"));
5616 if (type->integer_type() == NULL
5617 && type->float_type() == NULL
5618 && !type->is_string_type())
5620 error_at(location, "expected integer, floating, or string type");
5626 case OPERATOR_PLUSEQ:
5627 if (type->integer_type() == NULL
5628 && type->float_type() == NULL
5629 && type->complex_type() == NULL
5630 && !type->is_string_type())
5633 "expected integer, floating, complex, or string type");
5638 case OPERATOR_MINUS:
5639 case OPERATOR_MINUSEQ:
5641 case OPERATOR_MULTEQ:
5643 case OPERATOR_DIVEQ:
5644 if (type->integer_type() == NULL
5645 && type->float_type() == NULL
5646 && type->complex_type() == NULL)
5648 error_at(location, "expected integer, floating, or complex type");
5654 case OPERATOR_MODEQ:
5658 case OPERATOR_ANDEQ:
5660 case OPERATOR_XOREQ:
5661 case OPERATOR_BITCLEAR:
5662 case OPERATOR_BITCLEAREQ:
5663 if (type->integer_type() == NULL)
5665 error_at(location, "expected integer type");
5680 Binary_expression::do_check_types(Gogo*)
5682 if (this->classification() == EXPRESSION_ERROR)
5685 Type* left_type = this->left_->type();
5686 Type* right_type = this->right_->type();
5687 if (left_type->is_error_type() || right_type->is_error_type())
5689 this->set_is_error();
5693 if (this->op_ == OPERATOR_EQEQ
5694 || this->op_ == OPERATOR_NOTEQ
5695 || this->op_ == OPERATOR_LT
5696 || this->op_ == OPERATOR_LE
5697 || this->op_ == OPERATOR_GT
5698 || this->op_ == OPERATOR_GE)
5700 if (!Type::are_assignable(left_type, right_type, NULL)
5701 && !Type::are_assignable(right_type, left_type, NULL))
5703 this->report_error(_("incompatible types in binary expression"));
5706 if (!Binary_expression::check_operator_type(this->op_, left_type,
5708 || !Binary_expression::check_operator_type(this->op_, right_type,
5711 this->set_is_error();
5715 else if (this->op_ != OPERATOR_LSHIFT && this->op_ != OPERATOR_RSHIFT)
5717 if (!Type::are_compatible_for_binop(left_type, right_type))
5719 this->report_error(_("incompatible types in binary expression"));
5722 if (!Binary_expression::check_operator_type(this->op_, left_type,
5725 this->set_is_error();
5731 if (left_type->integer_type() == NULL)
5732 this->report_error(_("shift of non-integer operand"));
5734 if (!right_type->is_abstract()
5735 && (right_type->integer_type() == NULL
5736 || !right_type->integer_type()->is_unsigned()))
5737 this->report_error(_("shift count not unsigned integer"));
5743 if (this->right_->integer_constant_value(true, val, &type))
5745 if (mpz_sgn(val) < 0)
5746 this->report_error(_("negative shift count"));
5753 // Get a tree for a binary expression.
5756 Binary_expression::do_get_tree(Translate_context* context)
5758 tree left = this->left_->get_tree(context);
5759 tree right = this->right_->get_tree(context);
5761 if (left == error_mark_node || right == error_mark_node)
5762 return error_mark_node;
5764 enum tree_code code;
5765 bool use_left_type = true;
5766 bool is_shift_op = false;
5770 case OPERATOR_NOTEQ:
5775 return Expression::comparison_tree(context, this->op_,
5776 this->left_->type(), left,
5777 this->right_->type(), right,
5781 code = TRUTH_ORIF_EXPR;
5782 use_left_type = false;
5784 case OPERATOR_ANDAND:
5785 code = TRUTH_ANDIF_EXPR;
5786 use_left_type = false;
5791 case OPERATOR_MINUS:
5795 code = BIT_IOR_EXPR;
5798 code = BIT_XOR_EXPR;
5805 Type *t = this->left_->type();
5806 if (t->float_type() != NULL || t->complex_type() != NULL)
5809 code = TRUNC_DIV_EXPR;
5813 code = TRUNC_MOD_EXPR;
5815 case OPERATOR_LSHIFT:
5819 case OPERATOR_RSHIFT:
5824 code = BIT_AND_EXPR;
5826 case OPERATOR_BITCLEAR:
5827 right = fold_build1(BIT_NOT_EXPR, TREE_TYPE(right), right);
5828 code = BIT_AND_EXPR;
5834 tree type = use_left_type ? TREE_TYPE(left) : TREE_TYPE(right);
5836 if (this->left_->type()->is_string_type())
5838 gcc_assert(this->op_ == OPERATOR_PLUS);
5839 tree string_type = Type::make_string_type()->get_tree(context->gogo());
5840 static tree string_plus_decl;
5841 return Gogo::call_builtin(&string_plus_decl,
5852 tree compute_type = excess_precision_type(type);
5853 if (compute_type != NULL_TREE)
5855 left = ::convert(compute_type, left);
5856 right = ::convert(compute_type, right);
5859 tree eval_saved = NULL_TREE;
5862 // Make sure the values are evaluated.
5863 if (!DECL_P(left) && TREE_SIDE_EFFECTS(left))
5865 left = save_expr(left);
5868 if (!DECL_P(right) && TREE_SIDE_EFFECTS(right))
5870 right = save_expr(right);
5871 if (eval_saved == NULL_TREE)
5874 eval_saved = fold_build2_loc(this->location(), COMPOUND_EXPR,
5875 void_type_node, eval_saved, right);
5879 tree ret = fold_build2_loc(this->location(),
5881 compute_type != NULL_TREE ? compute_type : type,
5884 if (compute_type != NULL_TREE)
5885 ret = ::convert(type, ret);
5887 // In Go, a shift larger than the size of the type is well-defined.
5888 // This is not true in GENERIC, so we need to insert a conditional.
5891 gcc_assert(INTEGRAL_TYPE_P(TREE_TYPE(left)));
5892 gcc_assert(this->left_->type()->integer_type() != NULL);
5893 int bits = TYPE_PRECISION(TREE_TYPE(left));
5895 tree compare = fold_build2(LT_EXPR, boolean_type_node, right,
5896 build_int_cst_type(TREE_TYPE(right), bits));
5898 tree overflow_result = fold_convert_loc(this->location(),
5901 if (this->op_ == OPERATOR_RSHIFT
5902 && !this->left_->type()->integer_type()->is_unsigned())
5904 tree neg = fold_build2_loc(this->location(), LT_EXPR,
5905 boolean_type_node, left,
5906 fold_convert_loc(this->location(),
5908 integer_zero_node));
5909 tree neg_one = fold_build2_loc(this->location(),
5910 MINUS_EXPR, TREE_TYPE(left),
5911 fold_convert_loc(this->location(),
5914 fold_convert_loc(this->location(),
5917 overflow_result = fold_build3_loc(this->location(), COND_EXPR,
5918 TREE_TYPE(left), neg, neg_one,
5922 ret = fold_build3_loc(this->location(), COND_EXPR, TREE_TYPE(left),
5923 compare, ret, overflow_result);
5925 if (eval_saved != NULL_TREE)
5926 ret = fold_build2_loc(this->location(), COMPOUND_EXPR,
5927 TREE_TYPE(ret), eval_saved, ret);
5933 // Export a binary expression.
5936 Binary_expression::do_export(Export* exp) const
5938 exp->write_c_string("(");
5939 this->left_->export_expression(exp);
5943 exp->write_c_string(" || ");
5945 case OPERATOR_ANDAND:
5946 exp->write_c_string(" && ");
5949 exp->write_c_string(" == ");
5951 case OPERATOR_NOTEQ:
5952 exp->write_c_string(" != ");
5955 exp->write_c_string(" < ");
5958 exp->write_c_string(" <= ");
5961 exp->write_c_string(" > ");
5964 exp->write_c_string(" >= ");
5967 exp->write_c_string(" + ");
5969 case OPERATOR_MINUS:
5970 exp->write_c_string(" - ");
5973 exp->write_c_string(" | ");
5976 exp->write_c_string(" ^ ");
5979 exp->write_c_string(" * ");
5982 exp->write_c_string(" / ");
5985 exp->write_c_string(" % ");
5987 case OPERATOR_LSHIFT:
5988 exp->write_c_string(" << ");
5990 case OPERATOR_RSHIFT:
5991 exp->write_c_string(" >> ");
5994 exp->write_c_string(" & ");
5996 case OPERATOR_BITCLEAR:
5997 exp->write_c_string(" &^ ");
6002 this->right_->export_expression(exp);
6003 exp->write_c_string(")");
6006 // Import a binary expression.
6009 Binary_expression::do_import(Import* imp)
6011 imp->require_c_string("(");
6013 Expression* left = Expression::import_expression(imp);
6016 if (imp->match_c_string(" || "))
6021 else if (imp->match_c_string(" && "))
6023 op = OPERATOR_ANDAND;
6026 else if (imp->match_c_string(" == "))
6031 else if (imp->match_c_string(" != "))
6033 op = OPERATOR_NOTEQ;
6036 else if (imp->match_c_string(" < "))
6041 else if (imp->match_c_string(" <= "))
6046 else if (imp->match_c_string(" > "))
6051 else if (imp->match_c_string(" >= "))
6056 else if (imp->match_c_string(" + "))
6061 else if (imp->match_c_string(" - "))
6063 op = OPERATOR_MINUS;
6066 else if (imp->match_c_string(" | "))
6071 else if (imp->match_c_string(" ^ "))
6076 else if (imp->match_c_string(" * "))
6081 else if (imp->match_c_string(" / "))
6086 else if (imp->match_c_string(" % "))
6091 else if (imp->match_c_string(" << "))
6093 op = OPERATOR_LSHIFT;
6096 else if (imp->match_c_string(" >> "))
6098 op = OPERATOR_RSHIFT;
6101 else if (imp->match_c_string(" & "))
6106 else if (imp->match_c_string(" &^ "))
6108 op = OPERATOR_BITCLEAR;
6113 error_at(imp->location(), "unrecognized binary operator");
6114 return Expression::make_error(imp->location());
6117 Expression* right = Expression::import_expression(imp);
6119 imp->require_c_string(")");
6121 return Expression::make_binary(op, left, right, imp->location());
6124 // Make a binary expression.
6127 Expression::make_binary(Operator op, Expression* left, Expression* right,
6128 source_location location)
6130 return new Binary_expression(op, left, right, location);
6133 // Implement a comparison.
6136 Expression::comparison_tree(Translate_context* context, Operator op,
6137 Type* left_type, tree left_tree,
6138 Type* right_type, tree right_tree,
6139 source_location location)
6141 enum tree_code code;
6147 case OPERATOR_NOTEQ:
6166 if (left_type->is_string_type() && right_type->is_string_type())
6168 tree string_type = Type::make_string_type()->get_tree(context->gogo());
6169 static tree string_compare_decl;
6170 left_tree = Gogo::call_builtin(&string_compare_decl,
6179 right_tree = build_int_cst_type(integer_type_node, 0);
6181 else if ((left_type->interface_type() != NULL
6182 && right_type->interface_type() == NULL
6183 && !right_type->is_nil_type())
6184 || (left_type->interface_type() == NULL
6185 && !left_type->is_nil_type()
6186 && right_type->interface_type() != NULL))
6188 // Comparing an interface value to a non-interface value.
6189 if (left_type->interface_type() == NULL)
6191 std::swap(left_type, right_type);
6192 std::swap(left_tree, right_tree);
6195 // The right operand is not an interface. We need to take its
6196 // address if it is not a pointer.
6199 if (right_type->points_to() != NULL)
6201 make_tmp = NULL_TREE;
6204 else if (TREE_ADDRESSABLE(TREE_TYPE(right_tree)) || DECL_P(right_tree))
6206 make_tmp = NULL_TREE;
6207 arg = build_fold_addr_expr_loc(location, right_tree);
6208 if (DECL_P(right_tree))
6209 TREE_ADDRESSABLE(right_tree) = 1;
6213 tree tmp = create_tmp_var(TREE_TYPE(right_tree),
6214 get_name(right_tree));
6215 DECL_IGNORED_P(tmp) = 0;
6216 DECL_INITIAL(tmp) = right_tree;
6217 TREE_ADDRESSABLE(tmp) = 1;
6218 make_tmp = build1(DECL_EXPR, void_type_node, tmp);
6219 SET_EXPR_LOCATION(make_tmp, location);
6220 arg = build_fold_addr_expr_loc(location, tmp);
6222 arg = fold_convert_loc(location, ptr_type_node, arg);
6224 tree descriptor = right_type->type_descriptor_pointer(context->gogo());
6226 if (left_type->interface_type()->is_empty())
6228 static tree empty_interface_value_compare_decl;
6229 left_tree = Gogo::call_builtin(&empty_interface_value_compare_decl,
6231 "__go_empty_interface_value_compare",
6234 TREE_TYPE(left_tree),
6236 TREE_TYPE(descriptor),
6240 if (left_tree == error_mark_node)
6241 return error_mark_node;
6242 // This can panic if the type is not comparable.
6243 TREE_NOTHROW(empty_interface_value_compare_decl) = 0;
6247 static tree interface_value_compare_decl;
6248 left_tree = Gogo::call_builtin(&interface_value_compare_decl,
6250 "__go_interface_value_compare",
6253 TREE_TYPE(left_tree),
6255 TREE_TYPE(descriptor),
6259 if (left_tree == error_mark_node)
6260 return error_mark_node;
6261 // This can panic if the type is not comparable.
6262 TREE_NOTHROW(interface_value_compare_decl) = 0;
6264 right_tree = build_int_cst_type(integer_type_node, 0);
6266 if (make_tmp != NULL_TREE)
6267 left_tree = build2(COMPOUND_EXPR, TREE_TYPE(left_tree), make_tmp,
6270 else if (left_type->interface_type() != NULL
6271 && right_type->interface_type() != NULL)
6273 if (left_type->interface_type()->is_empty()
6274 && right_type->interface_type()->is_empty())
6276 static tree empty_interface_compare_decl;
6277 left_tree = Gogo::call_builtin(&empty_interface_compare_decl,
6279 "__go_empty_interface_compare",
6282 TREE_TYPE(left_tree),
6284 TREE_TYPE(right_tree),
6286 if (left_tree == error_mark_node)
6287 return error_mark_node;
6288 // This can panic if the type is uncomparable.
6289 TREE_NOTHROW(empty_interface_compare_decl) = 0;
6291 else if (!left_type->interface_type()->is_empty()
6292 && !right_type->interface_type()->is_empty())
6294 static tree interface_compare_decl;
6295 left_tree = Gogo::call_builtin(&interface_compare_decl,
6297 "__go_interface_compare",
6300 TREE_TYPE(left_tree),
6302 TREE_TYPE(right_tree),
6304 if (left_tree == error_mark_node)
6305 return error_mark_node;
6306 // This can panic if the type is uncomparable.
6307 TREE_NOTHROW(interface_compare_decl) = 0;
6311 if (left_type->interface_type()->is_empty())
6313 gcc_assert(op == OPERATOR_EQEQ || op == OPERATOR_NOTEQ);
6314 std::swap(left_type, right_type);
6315 std::swap(left_tree, right_tree);
6317 gcc_assert(!left_type->interface_type()->is_empty());
6318 gcc_assert(right_type->interface_type()->is_empty());
6319 static tree interface_empty_compare_decl;
6320 left_tree = Gogo::call_builtin(&interface_empty_compare_decl,
6322 "__go_interface_empty_compare",
6325 TREE_TYPE(left_tree),
6327 TREE_TYPE(right_tree),
6329 if (left_tree == error_mark_node)
6330 return error_mark_node;
6331 // This can panic if the type is uncomparable.
6332 TREE_NOTHROW(interface_empty_compare_decl) = 0;
6335 right_tree = build_int_cst_type(integer_type_node, 0);
6338 if (left_type->is_nil_type()
6339 && (op == OPERATOR_EQEQ || op == OPERATOR_NOTEQ))
6341 std::swap(left_type, right_type);
6342 std::swap(left_tree, right_tree);
6345 if (right_type->is_nil_type())
6347 if (left_type->array_type() != NULL
6348 && left_type->array_type()->length() == NULL)
6350 Array_type* at = left_type->array_type();
6351 left_tree = at->value_pointer_tree(context->gogo(), left_tree);
6352 right_tree = fold_convert(TREE_TYPE(left_tree), null_pointer_node);
6354 else if (left_type->interface_type() != NULL)
6356 // An interface is nil if the first field is nil.
6357 tree left_type_tree = TREE_TYPE(left_tree);
6358 gcc_assert(TREE_CODE(left_type_tree) == RECORD_TYPE);
6359 tree field = TYPE_FIELDS(left_type_tree);
6360 left_tree = build3(COMPONENT_REF, TREE_TYPE(field), left_tree,
6362 right_tree = fold_convert(TREE_TYPE(left_tree), null_pointer_node);
6366 gcc_assert(POINTER_TYPE_P(TREE_TYPE(left_tree)));
6367 right_tree = fold_convert(TREE_TYPE(left_tree), null_pointer_node);
6371 if (left_tree == error_mark_node || right_tree == error_mark_node)
6372 return error_mark_node;
6374 tree ret = fold_build2(code, boolean_type_node, left_tree, right_tree);
6375 if (CAN_HAVE_LOCATION_P(ret))
6376 SET_EXPR_LOCATION(ret, location);
6380 // Class Bound_method_expression.
6385 Bound_method_expression::do_traverse(Traverse* traverse)
6387 if (Expression::traverse(&this->expr_, traverse) == TRAVERSE_EXIT)
6388 return TRAVERSE_EXIT;
6389 return Expression::traverse(&this->method_, traverse);
6392 // Return the type of a bound method expression. The type of this
6393 // object is really the type of the method with no receiver. We
6394 // should be able to get away with just returning the type of the
6398 Bound_method_expression::do_type()
6400 return this->method_->type();
6403 // Determine the types of a method expression.
6406 Bound_method_expression::do_determine_type(const Type_context*)
6408 this->method_->determine_type_no_context();
6409 Type* mtype = this->method_->type();
6410 Function_type* fntype = mtype == NULL ? NULL : mtype->function_type();
6411 if (fntype == NULL || !fntype->is_method())
6412 this->expr_->determine_type_no_context();
6415 Type_context subcontext(fntype->receiver()->type(), false);
6416 this->expr_->determine_type(&subcontext);
6420 // Check the types of a method expression.
6423 Bound_method_expression::do_check_types(Gogo*)
6425 Type* type = this->method_->type()->deref();
6427 || type->function_type() == NULL
6428 || !type->function_type()->is_method())
6429 this->report_error(_("object is not a method"));
6432 Type* rtype = type->function_type()->receiver()->type()->deref();
6433 Type* etype = (this->expr_type_ != NULL
6435 : this->expr_->type());
6436 etype = etype->deref();
6437 if (!Type::are_identical(rtype, etype, true, NULL))
6438 this->report_error(_("method type does not match object type"));
6442 // Get the tree for a method expression. There is no standard tree
6443 // representation for this. The only places it may currently be used
6444 // are in a Call_expression or a Go_statement, which will take it
6445 // apart directly. So this has nothing to do at present.
6448 Bound_method_expression::do_get_tree(Translate_context*)
6450 error_at(this->location(), "reference to method other than calling it");
6451 return error_mark_node;
6454 // Make a method expression.
6456 Bound_method_expression*
6457 Expression::make_bound_method(Expression* expr, Expression* method,
6458 source_location location)
6460 return new Bound_method_expression(expr, method, location);
6463 // Class Builtin_call_expression. This is used for a call to a
6464 // builtin function.
6466 class Builtin_call_expression : public Call_expression
6469 Builtin_call_expression(Gogo* gogo, Expression* fn, Expression_list* args,
6470 bool is_varargs, source_location location);
6473 // This overrides Call_expression::do_lower.
6475 do_lower(Gogo*, Named_object*, int);
6478 do_is_constant() const;
6481 do_integer_constant_value(bool, mpz_t, Type**) const;
6484 do_float_constant_value(mpfr_t, Type**) const;
6487 do_complex_constant_value(mpfr_t, mpfr_t, Type**) const;
6493 do_determine_type(const Type_context*);
6496 do_check_types(Gogo*);
6501 return new Builtin_call_expression(this->gogo_, this->fn()->copy(),
6502 this->args()->copy(),
6508 do_get_tree(Translate_context*);
6511 do_export(Export*) const;
6514 do_is_recover_call() const;
6517 do_set_recover_arg(Expression*);
6520 // The builtin functions.
6521 enum Builtin_function_code
6525 // Predeclared builtin functions.
6542 // Builtin functions from the unsafe package.
6555 real_imag_type(Type*);
6558 complex_type(Type*);
6560 // A pointer back to the general IR structure. This avoids a global
6561 // variable, or passing it around everywhere.
6563 // The builtin function being called.
6564 Builtin_function_code code_;
6565 // Used to stop endless loops when the length of an array uses len
6566 // or cap of the array itself.
6570 Builtin_call_expression::Builtin_call_expression(Gogo* gogo,
6572 Expression_list* args,
6574 source_location location)
6575 : Call_expression(fn, args, is_varargs, location),
6576 gogo_(gogo), code_(BUILTIN_INVALID), seen_(false)
6578 Func_expression* fnexp = this->fn()->func_expression();
6579 gcc_assert(fnexp != NULL);
6580 const std::string& name(fnexp->named_object()->name());
6581 if (name == "append")
6582 this->code_ = BUILTIN_APPEND;
6583 else if (name == "cap")
6584 this->code_ = BUILTIN_CAP;
6585 else if (name == "close")
6586 this->code_ = BUILTIN_CLOSE;
6587 else if (name == "closed")
6588 this->code_ = BUILTIN_CLOSED;
6589 else if (name == "complex")
6590 this->code_ = BUILTIN_COMPLEX;
6591 else if (name == "copy")
6592 this->code_ = BUILTIN_COPY;
6593 else if (name == "imag")
6594 this->code_ = BUILTIN_IMAG;
6595 else if (name == "len")
6596 this->code_ = BUILTIN_LEN;
6597 else if (name == "make")
6598 this->code_ = BUILTIN_MAKE;
6599 else if (name == "new")
6600 this->code_ = BUILTIN_NEW;
6601 else if (name == "panic")
6602 this->code_ = BUILTIN_PANIC;
6603 else if (name == "print")
6604 this->code_ = BUILTIN_PRINT;
6605 else if (name == "println")
6606 this->code_ = BUILTIN_PRINTLN;
6607 else if (name == "real")
6608 this->code_ = BUILTIN_REAL;
6609 else if (name == "recover")
6610 this->code_ = BUILTIN_RECOVER;
6611 else if (name == "Alignof")
6612 this->code_ = BUILTIN_ALIGNOF;
6613 else if (name == "Offsetof")
6614 this->code_ = BUILTIN_OFFSETOF;
6615 else if (name == "Sizeof")
6616 this->code_ = BUILTIN_SIZEOF;
6621 // Return whether this is a call to recover. This is a virtual
6622 // function called from the parent class.
6625 Builtin_call_expression::do_is_recover_call() const
6627 if (this->classification() == EXPRESSION_ERROR)
6629 return this->code_ == BUILTIN_RECOVER;
6632 // Set the argument for a call to recover.
6635 Builtin_call_expression::do_set_recover_arg(Expression* arg)
6637 const Expression_list* args = this->args();
6638 gcc_assert(args == NULL || args->empty());
6639 Expression_list* new_args = new Expression_list();
6640 new_args->push_back(arg);
6641 this->set_args(new_args);
6644 // A traversal class which looks for a call expression.
6646 class Find_call_expression : public Traverse
6649 Find_call_expression()
6650 : Traverse(traverse_expressions),
6655 expression(Expression**);
6659 { return this->found_; }
6666 Find_call_expression::expression(Expression** pexpr)
6668 if ((*pexpr)->call_expression() != NULL)
6670 this->found_ = true;
6671 return TRAVERSE_EXIT;
6673 return TRAVERSE_CONTINUE;
6676 // Lower a builtin call expression. This turns new and make into
6677 // specific expressions. We also convert to a constant if we can.
6680 Builtin_call_expression::do_lower(Gogo* gogo, Named_object* function, int)
6682 if (this->code_ == BUILTIN_NEW)
6684 const Expression_list* args = this->args();
6685 if (args == NULL || args->size() < 1)
6686 this->report_error(_("not enough arguments"));
6687 else if (args->size() > 1)
6688 this->report_error(_("too many arguments"));
6691 Expression* arg = args->front();
6692 if (!arg->is_type_expression())
6694 error_at(arg->location(), "expected type");
6695 this->set_is_error();
6698 return Expression::make_allocation(arg->type(), this->location());
6701 else if (this->code_ == BUILTIN_MAKE)
6703 const Expression_list* args = this->args();
6704 if (args == NULL || args->size() < 1)
6705 this->report_error(_("not enough arguments"));
6708 Expression* arg = args->front();
6709 if (!arg->is_type_expression())
6711 error_at(arg->location(), "expected type");
6712 this->set_is_error();
6716 Expression_list* newargs;
6717 if (args->size() == 1)
6721 newargs = new Expression_list();
6722 Expression_list::const_iterator p = args->begin();
6724 for (; p != args->end(); ++p)
6725 newargs->push_back(*p);
6727 return Expression::make_make(arg->type(), newargs,
6732 else if (this->is_constant())
6734 // We can only lower len and cap if there are no function calls
6735 // in the arguments. Otherwise we have to make the call.
6736 if (this->code_ == BUILTIN_LEN || this->code_ == BUILTIN_CAP)
6738 Expression* arg = this->one_arg();
6739 if (!arg->is_constant())
6741 Find_call_expression find_call;
6742 Expression::traverse(&arg, &find_call);
6743 if (find_call.found())
6751 if (this->integer_constant_value(true, ival, &type))
6753 Expression* ret = Expression::make_integer(&ival, type,
6762 if (this->float_constant_value(rval, &type))
6764 Expression* ret = Expression::make_float(&rval, type,
6772 if (this->complex_constant_value(rval, imag, &type))
6774 Expression* ret = Expression::make_complex(&rval, &imag, type,
6783 else if (this->code_ == BUILTIN_RECOVER)
6785 if (function != NULL)
6786 function->func_value()->set_calls_recover();
6789 // Calling recover outside of a function always returns the
6790 // nil empty interface.
6791 Type* eface = Type::make_interface_type(NULL, this->location());
6792 return Expression::make_cast(eface,
6793 Expression::make_nil(this->location()),
6797 else if (this->code_ == BUILTIN_APPEND)
6799 // Lower the varargs.
6800 const Expression_list* args = this->args();
6801 if (args == NULL || args->empty())
6803 Type* slice_type = args->front()->type();
6804 if (!slice_type->is_open_array_type())
6806 error_at(args->front()->location(), "argument 1 must be a slice");
6807 this->set_is_error();
6810 return this->lower_varargs(gogo, function, slice_type, 2);
6816 // Return the type of the real or imag functions, given the type of
6817 // the argument. We need to map complex to float, complex64 to
6818 // float32, and complex128 to float64, so it has to be done by name.
6819 // This returns NULL if it can't figure out the type.
6822 Builtin_call_expression::real_imag_type(Type* arg_type)
6824 if (arg_type == NULL || arg_type->is_abstract())
6826 Named_type* nt = arg_type->named_type();
6829 while (nt->real_type()->named_type() != NULL)
6830 nt = nt->real_type()->named_type();
6831 if (nt->name() == "complex64")
6832 return Type::lookup_float_type("float32");
6833 else if (nt->name() == "complex128")
6834 return Type::lookup_float_type("float64");
6839 // Return the type of the complex function, given the type of one of the
6840 // argments. Like real_imag_type, we have to map by name.
6843 Builtin_call_expression::complex_type(Type* arg_type)
6845 if (arg_type == NULL || arg_type->is_abstract())
6847 Named_type* nt = arg_type->named_type();
6850 while (nt->real_type()->named_type() != NULL)
6851 nt = nt->real_type()->named_type();
6852 if (nt->name() == "float32")
6853 return Type::lookup_complex_type("complex64");
6854 else if (nt->name() == "float64")
6855 return Type::lookup_complex_type("complex128");
6860 // Return a single argument, or NULL if there isn't one.
6863 Builtin_call_expression::one_arg() const
6865 const Expression_list* args = this->args();
6866 if (args->size() != 1)
6868 return args->front();
6871 // Return whether this is constant: len of a string, or len or cap of
6872 // a fixed array, or unsafe.Sizeof, unsafe.Offsetof, unsafe.Alignof.
6875 Builtin_call_expression::do_is_constant() const
6877 switch (this->code_)
6885 Expression* arg = this->one_arg();
6888 Type* arg_type = arg->type();
6890 if (arg_type->points_to() != NULL
6891 && arg_type->points_to()->array_type() != NULL
6892 && !arg_type->points_to()->is_open_array_type())
6893 arg_type = arg_type->points_to();
6895 if (arg_type->array_type() != NULL
6896 && arg_type->array_type()->length() != NULL)
6899 if (this->code_ == BUILTIN_LEN && arg_type->is_string_type())
6902 bool ret = arg->is_constant();
6903 this->seen_ = false;
6909 case BUILTIN_SIZEOF:
6910 case BUILTIN_ALIGNOF:
6911 return this->one_arg() != NULL;
6913 case BUILTIN_OFFSETOF:
6915 Expression* arg = this->one_arg();
6918 return arg->field_reference_expression() != NULL;
6921 case BUILTIN_COMPLEX:
6923 const Expression_list* args = this->args();
6924 if (args != NULL && args->size() == 2)
6925 return args->front()->is_constant() && args->back()->is_constant();
6932 Expression* arg = this->one_arg();
6933 return arg != NULL && arg->is_constant();
6943 // Return an integer constant value if possible.
6946 Builtin_call_expression::do_integer_constant_value(bool iota_is_constant,
6950 if (this->code_ == BUILTIN_LEN
6951 || this->code_ == BUILTIN_CAP)
6953 Expression* arg = this->one_arg();
6956 Type* arg_type = arg->type();
6958 if (this->code_ == BUILTIN_LEN && arg_type->is_string_type())
6961 if (arg->string_constant_value(&sval))
6963 mpz_set_ui(val, sval.length());
6964 *ptype = Type::lookup_integer_type("int");
6969 if (arg_type->points_to() != NULL
6970 && arg_type->points_to()->array_type() != NULL
6971 && !arg_type->points_to()->is_open_array_type())
6972 arg_type = arg_type->points_to();
6974 if (arg_type->array_type() != NULL
6975 && arg_type->array_type()->length() != NULL)
6979 Expression* e = arg_type->array_type()->length();
6981 bool r = e->integer_constant_value(iota_is_constant, val, ptype);
6982 this->seen_ = false;
6985 *ptype = Type::lookup_integer_type("int");
6990 else if (this->code_ == BUILTIN_SIZEOF
6991 || this->code_ == BUILTIN_ALIGNOF)
6993 Expression* arg = this->one_arg();
6996 Type* arg_type = arg->type();
6997 if (arg_type->is_error_type() || arg_type->is_undefined())
6999 if (arg_type->is_abstract())
7001 tree arg_type_tree = arg_type->get_tree(this->gogo_);
7002 if (arg_type_tree == error_mark_node)
7004 unsigned long val_long;
7005 if (this->code_ == BUILTIN_SIZEOF)
7007 tree type_size = TYPE_SIZE_UNIT(arg_type_tree);
7008 gcc_assert(TREE_CODE(type_size) == INTEGER_CST);
7009 if (TREE_INT_CST_HIGH(type_size) != 0)
7011 unsigned HOST_WIDE_INT val_wide = TREE_INT_CST_LOW(type_size);
7012 val_long = static_cast<unsigned long>(val_wide);
7013 if (val_long != val_wide)
7016 else if (this->code_ == BUILTIN_ALIGNOF)
7018 if (arg->field_reference_expression() == NULL)
7019 val_long = go_type_alignment(arg_type_tree);
7022 // Calling unsafe.Alignof(s.f) returns the alignment of
7023 // the type of f when it is used as a field in a struct.
7024 val_long = go_field_alignment(arg_type_tree);
7029 mpz_set_ui(val, val_long);
7033 else if (this->code_ == BUILTIN_OFFSETOF)
7035 Expression* arg = this->one_arg();
7038 Field_reference_expression* farg = arg->field_reference_expression();
7041 Expression* struct_expr = farg->expr();
7042 Type* st = struct_expr->type();
7043 if (st->struct_type() == NULL)
7045 tree struct_tree = st->get_tree(this->gogo_);
7046 gcc_assert(TREE_CODE(struct_tree) == RECORD_TYPE);
7047 tree field = TYPE_FIELDS(struct_tree);
7048 for (unsigned int index = farg->field_index(); index > 0; --index)
7050 field = DECL_CHAIN(field);
7051 gcc_assert(field != NULL_TREE);
7053 HOST_WIDE_INT offset_wide = int_byte_position (field);
7054 if (offset_wide < 0)
7056 unsigned long offset_long = static_cast<unsigned long>(offset_wide);
7057 if (offset_long != static_cast<unsigned HOST_WIDE_INT>(offset_wide))
7059 mpz_set_ui(val, offset_long);
7065 // Return a floating point constant value if possible.
7068 Builtin_call_expression::do_float_constant_value(mpfr_t val,
7071 if (this->code_ == BUILTIN_REAL || this->code_ == BUILTIN_IMAG)
7073 Expression* arg = this->one_arg();
7084 if (arg->complex_constant_value(real, imag, &type))
7086 if (this->code_ == BUILTIN_REAL)
7087 mpfr_set(val, real, GMP_RNDN);
7089 mpfr_set(val, imag, GMP_RNDN);
7090 *ptype = Builtin_call_expression::real_imag_type(type);
7102 // Return a complex constant value if possible.
7105 Builtin_call_expression::do_complex_constant_value(mpfr_t real, mpfr_t imag,
7108 if (this->code_ == BUILTIN_COMPLEX)
7110 const Expression_list* args = this->args();
7111 if (args == NULL || args->size() != 2)
7117 if (!args->front()->float_constant_value(r, &rtype))
7128 if (args->back()->float_constant_value(i, &itype)
7129 && Type::are_identical(rtype, itype, false, NULL))
7131 mpfr_set(real, r, GMP_RNDN);
7132 mpfr_set(imag, i, GMP_RNDN);
7133 *ptype = Builtin_call_expression::complex_type(rtype);
7149 Builtin_call_expression::do_type()
7151 switch (this->code_)
7153 case BUILTIN_INVALID:
7160 const Expression_list* args = this->args();
7161 if (args == NULL || args->empty())
7162 return Type::make_error_type();
7163 return Type::make_pointer_type(args->front()->type());
7169 case BUILTIN_ALIGNOF:
7170 case BUILTIN_OFFSETOF:
7171 case BUILTIN_SIZEOF:
7172 return Type::lookup_integer_type("int");
7177 case BUILTIN_PRINTLN:
7178 return Type::make_void_type();
7180 case BUILTIN_CLOSED:
7181 return Type::lookup_bool_type();
7183 case BUILTIN_RECOVER:
7184 return Type::make_interface_type(NULL, BUILTINS_LOCATION);
7186 case BUILTIN_APPEND:
7188 const Expression_list* args = this->args();
7189 if (args == NULL || args->empty())
7190 return Type::make_error_type();
7191 return args->front()->type();
7197 Expression* arg = this->one_arg();
7199 return Type::make_error_type();
7200 Type* t = arg->type();
7201 if (t->is_abstract())
7202 t = t->make_non_abstract_type();
7203 t = Builtin_call_expression::real_imag_type(t);
7205 t = Type::make_error_type();
7209 case BUILTIN_COMPLEX:
7211 const Expression_list* args = this->args();
7212 if (args == NULL || args->size() != 2)
7213 return Type::make_error_type();
7214 Type* t = args->front()->type();
7215 if (t->is_abstract())
7217 t = args->back()->type();
7218 if (t->is_abstract())
7219 t = t->make_non_abstract_type();
7221 t = Builtin_call_expression::complex_type(t);
7223 t = Type::make_error_type();
7229 // Determine the type.
7232 Builtin_call_expression::do_determine_type(const Type_context* context)
7234 this->fn()->determine_type_no_context();
7236 const Expression_list* args = this->args();
7239 Type* arg_type = NULL;
7240 switch (this->code_)
7243 case BUILTIN_PRINTLN:
7244 // Do not force a large integer constant to "int".
7250 arg_type = Builtin_call_expression::complex_type(context->type);
7254 case BUILTIN_COMPLEX:
7256 // For the complex function the type of one operand can
7257 // determine the type of the other, as in a binary expression.
7258 arg_type = Builtin_call_expression::real_imag_type(context->type);
7259 if (args != NULL && args->size() == 2)
7261 Type* t1 = args->front()->type();
7262 Type* t2 = args->front()->type();
7263 if (!t1->is_abstract())
7265 else if (!t2->is_abstract())
7279 for (Expression_list::const_iterator pa = args->begin();
7283 Type_context subcontext;
7284 subcontext.type = arg_type;
7288 // We want to print large constants, we so can't just
7289 // use the appropriate nonabstract type. Use uint64 for
7290 // an integer if we know it is nonnegative, otherwise
7291 // use int64 for a integer, otherwise use float64 for a
7292 // float or complex128 for a complex.
7293 Type* want_type = NULL;
7294 Type* atype = (*pa)->type();
7295 if (atype->is_abstract())
7297 if (atype->integer_type() != NULL)
7302 if (this->integer_constant_value(true, val, &dummy)
7303 && mpz_sgn(val) >= 0)
7304 want_type = Type::lookup_integer_type("uint64");
7306 want_type = Type::lookup_integer_type("int64");
7309 else if (atype->float_type() != NULL)
7310 want_type = Type::lookup_float_type("float64");
7311 else if (atype->complex_type() != NULL)
7312 want_type = Type::lookup_complex_type("complex128");
7313 else if (atype->is_abstract_string_type())
7314 want_type = Type::lookup_string_type();
7315 else if (atype->is_abstract_boolean_type())
7316 want_type = Type::lookup_bool_type();
7319 subcontext.type = want_type;
7323 (*pa)->determine_type(&subcontext);
7328 // If there is exactly one argument, return true. Otherwise give an
7329 // error message and return false.
7332 Builtin_call_expression::check_one_arg()
7334 const Expression_list* args = this->args();
7335 if (args == NULL || args->size() < 1)
7337 this->report_error(_("not enough arguments"));
7340 else if (args->size() > 1)
7342 this->report_error(_("too many arguments"));
7345 if (args->front()->is_error_expression()
7346 || args->front()->type()->is_error_type()
7347 || args->front()->type()->is_undefined())
7349 this->set_is_error();
7355 // Check argument types for a builtin function.
7358 Builtin_call_expression::do_check_types(Gogo*)
7360 switch (this->code_)
7362 case BUILTIN_INVALID:
7370 // The single argument may be either a string or an array or a
7371 // map or a channel, or a pointer to a closed array.
7372 if (this->check_one_arg())
7374 Type* arg_type = this->one_arg()->type();
7375 if (arg_type->points_to() != NULL
7376 && arg_type->points_to()->array_type() != NULL
7377 && !arg_type->points_to()->is_open_array_type())
7378 arg_type = arg_type->points_to();
7379 if (this->code_ == BUILTIN_CAP)
7381 if (!arg_type->is_error_type()
7382 && arg_type->array_type() == NULL
7383 && arg_type->channel_type() == NULL)
7384 this->report_error(_("argument must be array or slice "
7389 if (!arg_type->is_error_type()
7390 && !arg_type->is_string_type()
7391 && arg_type->array_type() == NULL
7392 && arg_type->map_type() == NULL
7393 && arg_type->channel_type() == NULL)
7394 this->report_error(_("argument must be string or "
7395 "array or slice or map or channel"));
7402 case BUILTIN_PRINTLN:
7404 const Expression_list* args = this->args();
7407 if (this->code_ == BUILTIN_PRINT)
7408 warning_at(this->location(), 0,
7409 "no arguments for builtin function %<%s%>",
7410 (this->code_ == BUILTIN_PRINT
7416 for (Expression_list::const_iterator p = args->begin();
7420 Type* type = (*p)->type();
7421 if (type->is_error_type()
7422 || type->is_string_type()
7423 || type->integer_type() != NULL
7424 || type->float_type() != NULL
7425 || type->complex_type() != NULL
7426 || type->is_boolean_type()
7427 || type->points_to() != NULL
7428 || type->interface_type() != NULL
7429 || type->channel_type() != NULL
7430 || type->map_type() != NULL
7431 || type->function_type() != NULL
7432 || type->is_open_array_type())
7435 this->report_error(_("unsupported argument type to "
7436 "builtin function"));
7443 case BUILTIN_CLOSED:
7444 if (this->check_one_arg())
7446 if (this->one_arg()->type()->channel_type() == NULL)
7447 this->report_error(_("argument must be channel"));
7452 case BUILTIN_SIZEOF:
7453 case BUILTIN_ALIGNOF:
7454 this->check_one_arg();
7457 case BUILTIN_RECOVER:
7458 if (this->args() != NULL && !this->args()->empty())
7459 this->report_error(_("too many arguments"));
7462 case BUILTIN_OFFSETOF:
7463 if (this->check_one_arg())
7465 Expression* arg = this->one_arg();
7466 if (arg->field_reference_expression() == NULL)
7467 this->report_error(_("argument must be a field reference"));
7473 const Expression_list* args = this->args();
7474 if (args == NULL || args->size() < 2)
7476 this->report_error(_("not enough arguments"));
7479 else if (args->size() > 2)
7481 this->report_error(_("too many arguments"));
7484 Type* arg1_type = args->front()->type();
7485 Type* arg2_type = args->back()->type();
7486 if (arg1_type->is_error_type() || arg2_type->is_error_type())
7490 if (arg1_type->is_open_array_type())
7491 e1 = arg1_type->array_type()->element_type();
7494 this->report_error(_("left argument must be a slice"));
7499 if (arg2_type->is_open_array_type())
7500 e2 = arg2_type->array_type()->element_type();
7501 else if (arg2_type->is_string_type())
7502 e2 = Type::lookup_integer_type("uint8");
7505 this->report_error(_("right argument must be a slice or a string"));
7509 if (!Type::are_identical(e1, e2, true, NULL))
7510 this->report_error(_("element types must be the same"));
7514 case BUILTIN_APPEND:
7516 const Expression_list* args = this->args();
7517 if (args == NULL || args->size() < 2)
7519 this->report_error(_("not enough arguments"));
7522 if (args->size() > 2)
7524 this->report_error(_("too many arguments"));
7528 if (!Type::are_assignable(args->front()->type(), args->back()->type(),
7532 this->report_error(_("arguments 1 and 2 have different types"));
7535 error_at(this->location(),
7536 "arguments 1 and 2 have different types (%s)",
7538 this->set_is_error();
7546 if (this->check_one_arg())
7548 if (this->one_arg()->type()->complex_type() == NULL)
7549 this->report_error(_("argument must have complex type"));
7553 case BUILTIN_COMPLEX:
7555 const Expression_list* args = this->args();
7556 if (args == NULL || args->size() < 2)
7557 this->report_error(_("not enough arguments"));
7558 else if (args->size() > 2)
7559 this->report_error(_("too many arguments"));
7560 else if (args->front()->is_error_expression()
7561 || args->front()->type()->is_error_type()
7562 || args->back()->is_error_expression()
7563 || args->back()->type()->is_error_type())
7564 this->set_is_error();
7565 else if (!Type::are_identical(args->front()->type(),
7566 args->back()->type(), true, NULL))
7567 this->report_error(_("complex arguments must have identical types"));
7568 else if (args->front()->type()->float_type() == NULL)
7569 this->report_error(_("complex arguments must have "
7570 "floating-point type"));
7579 // Return the tree for a builtin function.
7582 Builtin_call_expression::do_get_tree(Translate_context* context)
7584 Gogo* gogo = context->gogo();
7585 source_location location = this->location();
7586 switch (this->code_)
7588 case BUILTIN_INVALID:
7596 const Expression_list* args = this->args();
7597 gcc_assert(args != NULL && args->size() == 1);
7598 Expression* arg = *args->begin();
7599 Type* arg_type = arg->type();
7603 gcc_assert(saw_errors());
7604 return error_mark_node;
7608 tree arg_tree = arg->get_tree(context);
7610 this->seen_ = false;
7612 if (arg_tree == error_mark_node)
7613 return error_mark_node;
7615 if (arg_type->points_to() != NULL)
7617 arg_type = arg_type->points_to();
7618 gcc_assert(arg_type->array_type() != NULL
7619 && !arg_type->is_open_array_type());
7620 gcc_assert(POINTER_TYPE_P(TREE_TYPE(arg_tree)));
7621 arg_tree = build_fold_indirect_ref(arg_tree);
7625 if (this->code_ == BUILTIN_LEN)
7627 if (arg_type->is_string_type())
7628 val_tree = String_type::length_tree(gogo, arg_tree);
7629 else if (arg_type->array_type() != NULL)
7633 gcc_assert(saw_errors());
7634 return error_mark_node;
7637 val_tree = arg_type->array_type()->length_tree(gogo, arg_tree);
7638 this->seen_ = false;
7640 else if (arg_type->map_type() != NULL)
7642 static tree map_len_fndecl;
7643 val_tree = Gogo::call_builtin(&map_len_fndecl,
7648 arg_type->get_tree(gogo),
7651 else if (arg_type->channel_type() != NULL)
7653 static tree chan_len_fndecl;
7654 val_tree = Gogo::call_builtin(&chan_len_fndecl,
7659 arg_type->get_tree(gogo),
7667 if (arg_type->array_type() != NULL)
7671 gcc_assert(saw_errors());
7672 return error_mark_node;
7675 val_tree = arg_type->array_type()->capacity_tree(gogo,
7677 this->seen_ = false;
7679 else if (arg_type->channel_type() != NULL)
7681 static tree chan_cap_fndecl;
7682 val_tree = Gogo::call_builtin(&chan_cap_fndecl,
7687 arg_type->get_tree(gogo),
7694 if (val_tree == error_mark_node)
7695 return error_mark_node;
7697 tree type_tree = Type::lookup_integer_type("int")->get_tree(gogo);
7698 if (type_tree == TREE_TYPE(val_tree))
7701 return fold(convert_to_integer(type_tree, val_tree));
7705 case BUILTIN_PRINTLN:
7707 const bool is_ln = this->code_ == BUILTIN_PRINTLN;
7708 tree stmt_list = NULL_TREE;
7710 const Expression_list* call_args = this->args();
7711 if (call_args != NULL)
7713 for (Expression_list::const_iterator p = call_args->begin();
7714 p != call_args->end();
7717 if (is_ln && p != call_args->begin())
7719 static tree print_space_fndecl;
7720 tree call = Gogo::call_builtin(&print_space_fndecl,
7725 if (call == error_mark_node)
7726 return error_mark_node;
7727 append_to_statement_list(call, &stmt_list);
7730 Type* type = (*p)->type();
7732 tree arg = (*p)->get_tree(context);
7733 if (arg == error_mark_node)
7734 return error_mark_node;
7738 if (type->is_string_type())
7740 static tree print_string_fndecl;
7741 pfndecl = &print_string_fndecl;
7742 fnname = "__go_print_string";
7744 else if (type->integer_type() != NULL
7745 && type->integer_type()->is_unsigned())
7747 static tree print_uint64_fndecl;
7748 pfndecl = &print_uint64_fndecl;
7749 fnname = "__go_print_uint64";
7750 Type* itype = Type::lookup_integer_type("uint64");
7751 arg = fold_convert_loc(location, itype->get_tree(gogo),
7754 else if (type->integer_type() != NULL)
7756 static tree print_int64_fndecl;
7757 pfndecl = &print_int64_fndecl;
7758 fnname = "__go_print_int64";
7759 Type* itype = Type::lookup_integer_type("int64");
7760 arg = fold_convert_loc(location, itype->get_tree(gogo),
7763 else if (type->float_type() != NULL)
7765 static tree print_double_fndecl;
7766 pfndecl = &print_double_fndecl;
7767 fnname = "__go_print_double";
7768 arg = fold_convert_loc(location, double_type_node, arg);
7770 else if (type->complex_type() != NULL)
7772 static tree print_complex_fndecl;
7773 pfndecl = &print_complex_fndecl;
7774 fnname = "__go_print_complex";
7775 arg = fold_convert_loc(location, complex_double_type_node,
7778 else if (type->is_boolean_type())
7780 static tree print_bool_fndecl;
7781 pfndecl = &print_bool_fndecl;
7782 fnname = "__go_print_bool";
7784 else if (type->points_to() != NULL
7785 || type->channel_type() != NULL
7786 || type->map_type() != NULL
7787 || type->function_type() != NULL)
7789 static tree print_pointer_fndecl;
7790 pfndecl = &print_pointer_fndecl;
7791 fnname = "__go_print_pointer";
7792 arg = fold_convert_loc(location, ptr_type_node, arg);
7794 else if (type->interface_type() != NULL)
7796 if (type->interface_type()->is_empty())
7798 static tree print_empty_interface_fndecl;
7799 pfndecl = &print_empty_interface_fndecl;
7800 fnname = "__go_print_empty_interface";
7804 static tree print_interface_fndecl;
7805 pfndecl = &print_interface_fndecl;
7806 fnname = "__go_print_interface";
7809 else if (type->is_open_array_type())
7811 static tree print_slice_fndecl;
7812 pfndecl = &print_slice_fndecl;
7813 fnname = "__go_print_slice";
7818 tree call = Gogo::call_builtin(pfndecl,
7825 if (call == error_mark_node)
7826 return error_mark_node;
7827 append_to_statement_list(call, &stmt_list);
7833 static tree print_nl_fndecl;
7834 tree call = Gogo::call_builtin(&print_nl_fndecl,
7839 if (call == error_mark_node)
7840 return error_mark_node;
7841 append_to_statement_list(call, &stmt_list);
7849 const Expression_list* args = this->args();
7850 gcc_assert(args != NULL && args->size() == 1);
7851 Expression* arg = args->front();
7852 tree arg_tree = arg->get_tree(context);
7853 if (arg_tree == error_mark_node)
7854 return error_mark_node;
7855 Type *empty = Type::make_interface_type(NULL, BUILTINS_LOCATION);
7856 arg_tree = Expression::convert_for_assignment(context, empty,
7858 arg_tree, location);
7859 static tree panic_fndecl;
7860 tree call = Gogo::call_builtin(&panic_fndecl,
7865 TREE_TYPE(arg_tree),
7867 if (call == error_mark_node)
7868 return error_mark_node;
7869 // This function will throw an exception.
7870 TREE_NOTHROW(panic_fndecl) = 0;
7871 // This function will not return.
7872 TREE_THIS_VOLATILE(panic_fndecl) = 1;
7876 case BUILTIN_RECOVER:
7878 // The argument is set when building recover thunks. It's a
7879 // boolean value which is true if we can recover a value now.
7880 const Expression_list* args = this->args();
7881 gcc_assert(args != NULL && args->size() == 1);
7882 Expression* arg = args->front();
7883 tree arg_tree = arg->get_tree(context);
7884 if (arg_tree == error_mark_node)
7885 return error_mark_node;
7887 Type *empty = Type::make_interface_type(NULL, BUILTINS_LOCATION);
7888 tree empty_tree = empty->get_tree(context->gogo());
7890 Type* nil_type = Type::make_nil_type();
7891 Expression* nil = Expression::make_nil(location);
7892 tree nil_tree = nil->get_tree(context);
7893 tree empty_nil_tree = Expression::convert_for_assignment(context,
7899 // We need to handle a deferred call to recover specially,
7900 // because it changes whether it can recover a panic or not.
7901 // See test7 in test/recover1.go.
7903 if (this->is_deferred())
7905 static tree deferred_recover_fndecl;
7906 call = Gogo::call_builtin(&deferred_recover_fndecl,
7908 "__go_deferred_recover",
7914 static tree recover_fndecl;
7915 call = Gogo::call_builtin(&recover_fndecl,
7921 if (call == error_mark_node)
7922 return error_mark_node;
7923 return fold_build3_loc(location, COND_EXPR, empty_tree, arg_tree,
7924 call, empty_nil_tree);
7928 case BUILTIN_CLOSED:
7930 const Expression_list* args = this->args();
7931 gcc_assert(args != NULL && args->size() == 1);
7932 Expression* arg = args->front();
7933 tree arg_tree = arg->get_tree(context);
7934 if (arg_tree == error_mark_node)
7935 return error_mark_node;
7936 if (this->code_ == BUILTIN_CLOSE)
7938 static tree close_fndecl;
7939 return Gogo::call_builtin(&close_fndecl,
7941 "__go_builtin_close",
7944 TREE_TYPE(arg_tree),
7949 static tree closed_fndecl;
7950 return Gogo::call_builtin(&closed_fndecl,
7952 "__go_builtin_closed",
7955 TREE_TYPE(arg_tree),
7960 case BUILTIN_SIZEOF:
7961 case BUILTIN_OFFSETOF:
7962 case BUILTIN_ALIGNOF:
7967 bool b = this->integer_constant_value(true, val, &dummy);
7969 tree type = Type::lookup_integer_type("int")->get_tree(gogo);
7970 tree ret = Expression::integer_constant_tree(val, type);
7977 const Expression_list* args = this->args();
7978 gcc_assert(args != NULL && args->size() == 2);
7979 Expression* arg1 = args->front();
7980 Expression* arg2 = args->back();
7982 tree arg1_tree = arg1->get_tree(context);
7983 tree arg2_tree = arg2->get_tree(context);
7984 if (arg1_tree == error_mark_node || arg2_tree == error_mark_node)
7985 return error_mark_node;
7987 Type* arg1_type = arg1->type();
7988 Array_type* at = arg1_type->array_type();
7989 arg1_tree = save_expr(arg1_tree);
7990 tree arg1_val = at->value_pointer_tree(gogo, arg1_tree);
7991 tree arg1_len = at->length_tree(gogo, arg1_tree);
7992 if (arg1_val == error_mark_node || arg1_len == error_mark_node)
7993 return error_mark_node;
7995 Type* arg2_type = arg2->type();
7998 if (arg2_type->is_open_array_type())
8000 at = arg2_type->array_type();
8001 arg2_tree = save_expr(arg2_tree);
8002 arg2_val = at->value_pointer_tree(gogo, arg2_tree);
8003 arg2_len = at->length_tree(gogo, arg2_tree);
8007 arg2_tree = save_expr(arg2_tree);
8008 arg2_val = String_type::bytes_tree(gogo, arg2_tree);
8009 arg2_len = String_type::length_tree(gogo, arg2_tree);
8011 if (arg2_val == error_mark_node || arg2_len == error_mark_node)
8012 return error_mark_node;
8014 arg1_len = save_expr(arg1_len);
8015 arg2_len = save_expr(arg2_len);
8016 tree len = fold_build3_loc(location, COND_EXPR, TREE_TYPE(arg1_len),
8017 fold_build2_loc(location, LT_EXPR,
8019 arg1_len, arg2_len),
8020 arg1_len, arg2_len);
8021 len = save_expr(len);
8023 Type* element_type = at->element_type();
8024 tree element_type_tree = element_type->get_tree(gogo);
8025 if (element_type_tree == error_mark_node)
8026 return error_mark_node;
8027 tree element_size = TYPE_SIZE_UNIT(element_type_tree);
8028 tree bytecount = fold_convert_loc(location, TREE_TYPE(element_size),
8030 bytecount = fold_build2_loc(location, MULT_EXPR,
8031 TREE_TYPE(element_size),
8032 bytecount, element_size);
8033 bytecount = fold_convert_loc(location, size_type_node, bytecount);
8035 arg1_val = fold_convert_loc(location, ptr_type_node, arg1_val);
8036 arg2_val = fold_convert_loc(location, ptr_type_node, arg2_val);
8038 static tree copy_fndecl;
8039 tree call = Gogo::call_builtin(©_fndecl,
8050 if (call == error_mark_node)
8051 return error_mark_node;
8053 return fold_build2_loc(location, COMPOUND_EXPR, TREE_TYPE(len),
8057 case BUILTIN_APPEND:
8059 const Expression_list* args = this->args();
8060 gcc_assert(args != NULL && args->size() == 2);
8061 Expression* arg1 = args->front();
8062 Expression* arg2 = args->back();
8064 tree arg1_tree = arg1->get_tree(context);
8065 tree arg2_tree = arg2->get_tree(context);
8066 if (arg1_tree == error_mark_node || arg2_tree == error_mark_node)
8067 return error_mark_node;
8069 Array_type* at = arg1->type()->array_type();
8070 Type* element_type = at->element_type();
8072 arg2_tree = Expression::convert_for_assignment(context, at,
8076 if (arg2_tree == error_mark_node)
8077 return error_mark_node;
8079 arg2_tree = save_expr(arg2_tree);
8080 tree arg2_val = at->value_pointer_tree(gogo, arg2_tree);
8081 tree arg2_len = at->length_tree(gogo, arg2_tree);
8082 if (arg2_val == error_mark_node || arg2_len == error_mark_node)
8083 return error_mark_node;
8084 arg2_val = fold_convert_loc(location, ptr_type_node, arg2_val);
8085 arg2_len = fold_convert_loc(location, size_type_node, arg2_len);
8087 tree element_type_tree = element_type->get_tree(gogo);
8088 if (element_type_tree == error_mark_node)
8089 return error_mark_node;
8090 tree element_size = TYPE_SIZE_UNIT(element_type_tree);
8091 element_size = fold_convert_loc(location, size_type_node,
8094 // We rebuild the decl each time since the slice types may
8096 tree append_fndecl = NULL_TREE;
8097 return Gogo::call_builtin(&append_fndecl,
8101 TREE_TYPE(arg1_tree),
8102 TREE_TYPE(arg1_tree),
8115 const Expression_list* args = this->args();
8116 gcc_assert(args != NULL && args->size() == 1);
8117 Expression* arg = args->front();
8118 tree arg_tree = arg->get_tree(context);
8119 if (arg_tree == error_mark_node)
8120 return error_mark_node;
8121 gcc_assert(COMPLEX_FLOAT_TYPE_P(TREE_TYPE(arg_tree)));
8122 if (this->code_ == BUILTIN_REAL)
8123 return fold_build1_loc(location, REALPART_EXPR,
8124 TREE_TYPE(TREE_TYPE(arg_tree)),
8127 return fold_build1_loc(location, IMAGPART_EXPR,
8128 TREE_TYPE(TREE_TYPE(arg_tree)),
8132 case BUILTIN_COMPLEX:
8134 const Expression_list* args = this->args();
8135 gcc_assert(args != NULL && args->size() == 2);
8136 tree r = args->front()->get_tree(context);
8137 tree i = args->back()->get_tree(context);
8138 if (r == error_mark_node || i == error_mark_node)
8139 return error_mark_node;
8140 gcc_assert(TYPE_MAIN_VARIANT(TREE_TYPE(r))
8141 == TYPE_MAIN_VARIANT(TREE_TYPE(i)));
8142 gcc_assert(SCALAR_FLOAT_TYPE_P(TREE_TYPE(r)));
8143 return fold_build2_loc(location, COMPLEX_EXPR,
8144 build_complex_type(TREE_TYPE(r)),
8153 // We have to support exporting a builtin call expression, because
8154 // code can set a constant to the result of a builtin expression.
8157 Builtin_call_expression::do_export(Export* exp) const
8164 if (this->integer_constant_value(true, val, &dummy))
8166 Integer_expression::export_integer(exp, val);
8175 if (this->float_constant_value(fval, &dummy))
8177 Float_expression::export_float(exp, fval);
8189 if (this->complex_constant_value(real, imag, &dummy))
8191 Complex_expression::export_complex(exp, real, imag);
8200 error_at(this->location(), "value is not constant");
8204 // A trailing space lets us reliably identify the end of the number.
8205 exp->write_c_string(" ");
8208 // Class Call_expression.
8213 Call_expression::do_traverse(Traverse* traverse)
8215 if (Expression::traverse(&this->fn_, traverse) == TRAVERSE_EXIT)
8216 return TRAVERSE_EXIT;
8217 if (this->args_ != NULL)
8219 if (this->args_->traverse(traverse) == TRAVERSE_EXIT)
8220 return TRAVERSE_EXIT;
8222 return TRAVERSE_CONTINUE;
8225 // Lower a call statement.
8228 Call_expression::do_lower(Gogo* gogo, Named_object* function, int)
8230 // A type case can look like a function call.
8231 if (this->fn_->is_type_expression()
8232 && this->args_ != NULL
8233 && this->args_->size() == 1)
8234 return Expression::make_cast(this->fn_->type(), this->args_->front(),
8237 // Recognize a call to a builtin function.
8238 Func_expression* fne = this->fn_->func_expression();
8240 && fne->named_object()->is_function_declaration()
8241 && fne->named_object()->func_declaration_value()->type()->is_builtin())
8242 return new Builtin_call_expression(gogo, this->fn_, this->args_,
8243 this->is_varargs_, this->location());
8245 // Handle an argument which is a call to a function which returns
8246 // multiple results.
8247 if (this->args_ != NULL
8248 && this->args_->size() == 1
8249 && this->args_->front()->call_expression() != NULL
8250 && this->fn_->type()->function_type() != NULL)
8252 Function_type* fntype = this->fn_->type()->function_type();
8253 size_t rc = this->args_->front()->call_expression()->result_count();
8255 && fntype->parameters() != NULL
8256 && (fntype->parameters()->size() == rc
8257 || (fntype->is_varargs()
8258 && fntype->parameters()->size() - 1 <= rc)))
8260 Call_expression* call = this->args_->front()->call_expression();
8261 Expression_list* args = new Expression_list;
8262 for (size_t i = 0; i < rc; ++i)
8263 args->push_back(Expression::make_call_result(call, i));
8264 // We can't return a new call expression here, because this
8265 // one may be referenced by Call_result expressions. FIXME.
8271 // Handle a call to a varargs function by packaging up the extra
8273 if (this->fn_->type()->function_type() != NULL
8274 && this->fn_->type()->function_type()->is_varargs())
8276 Function_type* fntype = this->fn_->type()->function_type();
8277 const Typed_identifier_list* parameters = fntype->parameters();
8278 gcc_assert(parameters != NULL && !parameters->empty());
8279 Type* varargs_type = parameters->back().type();
8280 return this->lower_varargs(gogo, function, varargs_type,
8281 parameters->size());
8287 // Lower a call to a varargs function. FUNCTION is the function in
8288 // which the call occurs--it's not the function we are calling.
8289 // VARARGS_TYPE is the type of the varargs parameter, a slice type.
8290 // PARAM_COUNT is the number of parameters of the function we are
8291 // calling; the last of these parameters will be the varargs
8295 Call_expression::lower_varargs(Gogo* gogo, Named_object* function,
8296 Type* varargs_type, size_t param_count)
8298 if (this->varargs_are_lowered_)
8301 source_location loc = this->location();
8303 gcc_assert(param_count > 0);
8304 gcc_assert(varargs_type->is_open_array_type());
8306 size_t arg_count = this->args_ == NULL ? 0 : this->args_->size();
8307 if (arg_count < param_count - 1)
8309 // Not enough arguments; will be caught in check_types.
8313 Expression_list* old_args = this->args_;
8314 Expression_list* new_args = new Expression_list();
8315 bool push_empty_arg = false;
8316 if (old_args == NULL || old_args->empty())
8318 gcc_assert(param_count == 1);
8319 push_empty_arg = true;
8323 Expression_list::const_iterator pa;
8325 for (pa = old_args->begin(); pa != old_args->end(); ++pa, ++i)
8327 if (static_cast<size_t>(i) == param_count)
8329 new_args->push_back(*pa);
8332 // We have reached the varargs parameter.
8334 bool issued_error = false;
8335 if (pa == old_args->end())
8336 push_empty_arg = true;
8337 else if (pa + 1 == old_args->end() && this->is_varargs_)
8338 new_args->push_back(*pa);
8339 else if (this->is_varargs_)
8341 this->report_error(_("too many arguments"));
8346 Type* element_type = varargs_type->array_type()->element_type();
8347 Expression_list* vals = new Expression_list;
8348 for (; pa != old_args->end(); ++pa, ++i)
8350 // Check types here so that we get a better message.
8351 Type* patype = (*pa)->type();
8352 source_location paloc = (*pa)->location();
8353 if (!this->check_argument_type(i, element_type, patype,
8354 paloc, issued_error))
8356 vals->push_back(*pa);
8359 Expression::make_slice_composite_literal(varargs_type, vals, loc);
8360 new_args->push_back(val);
8365 new_args->push_back(Expression::make_nil(loc));
8367 // We can't return a new call expression here, because this one may
8368 // be referenced by Call_result expressions. FIXME.
8369 if (old_args != NULL)
8371 this->args_ = new_args;
8372 this->varargs_are_lowered_ = true;
8374 // Lower all the new subexpressions.
8375 Expression* ret = this;
8376 gogo->lower_expression(function, &ret);
8377 gcc_assert(ret == this);
8381 // Get the function type. Returns NULL if we don't know the type. If
8382 // this returns NULL, and if_ERROR is true, issues an error.
8385 Call_expression::get_function_type() const
8387 return this->fn_->type()->function_type();
8390 // Return the number of values which this call will return.
8393 Call_expression::result_count() const
8395 const Function_type* fntype = this->get_function_type();
8398 if (fntype->results() == NULL)
8400 return fntype->results()->size();
8403 // Return whether this is a call to the predeclared function recover.
8406 Call_expression::is_recover_call() const
8408 return this->do_is_recover_call();
8411 // Set the argument to the recover function.
8414 Call_expression::set_recover_arg(Expression* arg)
8416 this->do_set_recover_arg(arg);
8419 // Virtual functions also implemented by Builtin_call_expression.
8422 Call_expression::do_is_recover_call() const
8428 Call_expression::do_set_recover_arg(Expression*)
8436 Call_expression::do_type()
8438 if (this->type_ != NULL)
8442 Function_type* fntype = this->get_function_type();
8444 return Type::make_error_type();
8446 const Typed_identifier_list* results = fntype->results();
8447 if (results == NULL)
8448 ret = Type::make_void_type();
8449 else if (results->size() == 1)
8450 ret = results->begin()->type();
8452 ret = Type::make_call_multiple_result_type(this);
8459 // Determine types for a call expression. We can use the function
8460 // parameter types to set the types of the arguments.
8463 Call_expression::do_determine_type(const Type_context*)
8465 this->fn_->determine_type_no_context();
8466 Function_type* fntype = this->get_function_type();
8467 const Typed_identifier_list* parameters = NULL;
8469 parameters = fntype->parameters();
8470 if (this->args_ != NULL)
8472 Typed_identifier_list::const_iterator pt;
8473 if (parameters != NULL)
8474 pt = parameters->begin();
8475 for (Expression_list::const_iterator pa = this->args_->begin();
8476 pa != this->args_->end();
8479 if (parameters != NULL && pt != parameters->end())
8481 Type_context subcontext(pt->type(), false);
8482 (*pa)->determine_type(&subcontext);
8486 (*pa)->determine_type_no_context();
8491 // Check types for parameter I.
8494 Call_expression::check_argument_type(int i, const Type* parameter_type,
8495 const Type* argument_type,
8496 source_location argument_location,
8500 if (!Type::are_assignable(parameter_type, argument_type, &reason))
8505 error_at(argument_location, "argument %d has incompatible type", i);
8507 error_at(argument_location,
8508 "argument %d has incompatible type (%s)",
8511 this->set_is_error();
8520 Call_expression::do_check_types(Gogo*)
8522 Function_type* fntype = this->get_function_type();
8525 if (!this->fn_->type()->is_error_type())
8526 this->report_error(_("expected function"));
8530 if (fntype->is_method())
8532 // We don't support pointers to methods, so the function has to
8533 // be a bound method expression.
8534 Bound_method_expression* bme = this->fn_->bound_method_expression();
8537 this->report_error(_("method call without object"));
8540 Type* first_arg_type = bme->first_argument()->type();
8541 if (first_arg_type->points_to() == NULL)
8543 // When passing a value, we need to check that we are
8544 // permitted to copy it.
8546 if (!Type::are_assignable(fntype->receiver()->type(),
8547 first_arg_type, &reason))
8550 this->report_error(_("incompatible type for receiver"));
8553 error_at(this->location(),
8554 "incompatible type for receiver (%s)",
8556 this->set_is_error();
8562 // Note that varargs was handled by the lower_varargs() method, so
8563 // we don't have to worry about it here.
8565 const Typed_identifier_list* parameters = fntype->parameters();
8566 if (this->args_ == NULL)
8568 if (parameters != NULL && !parameters->empty())
8569 this->report_error(_("not enough arguments"));
8571 else if (parameters == NULL)
8572 this->report_error(_("too many arguments"));
8576 Typed_identifier_list::const_iterator pt = parameters->begin();
8577 for (Expression_list::const_iterator pa = this->args_->begin();
8578 pa != this->args_->end();
8581 if (pt == parameters->end())
8583 this->report_error(_("too many arguments"));
8586 this->check_argument_type(i + 1, pt->type(), (*pa)->type(),
8587 (*pa)->location(), false);
8589 if (pt != parameters->end())
8590 this->report_error(_("not enough arguments"));
8594 // Return whether we have to use a temporary variable to ensure that
8595 // we evaluate this call expression in order. If the call returns no
8596 // results then it will inevitably be executed last. If the call
8597 // returns more than one result then it will be used with Call_result
8598 // expressions. So we only have to use a temporary variable if the
8599 // call returns exactly one result.
8602 Call_expression::do_must_eval_in_order() const
8604 return this->result_count() == 1;
8607 // Get the function and the first argument to use when calling a bound
8611 Call_expression::bound_method_function(Translate_context* context,
8612 Bound_method_expression* bound_method,
8613 tree* first_arg_ptr)
8615 Expression* first_argument = bound_method->first_argument();
8616 tree first_arg = first_argument->get_tree(context);
8617 if (first_arg == error_mark_node)
8618 return error_mark_node;
8620 // We always pass a pointer to the first argument when calling a
8622 if (first_argument->type()->points_to() == NULL)
8624 tree pointer_to_arg_type = build_pointer_type(TREE_TYPE(first_arg));
8625 if (TREE_ADDRESSABLE(TREE_TYPE(first_arg))
8626 || DECL_P(first_arg)
8627 || TREE_CODE(first_arg) == INDIRECT_REF
8628 || TREE_CODE(first_arg) == COMPONENT_REF)
8630 first_arg = build_fold_addr_expr(first_arg);
8631 if (DECL_P(first_arg))
8632 TREE_ADDRESSABLE(first_arg) = 1;
8636 tree tmp = create_tmp_var(TREE_TYPE(first_arg),
8637 get_name(first_arg));
8638 DECL_IGNORED_P(tmp) = 0;
8639 DECL_INITIAL(tmp) = first_arg;
8640 first_arg = build2(COMPOUND_EXPR, pointer_to_arg_type,
8641 build1(DECL_EXPR, void_type_node, tmp),
8642 build_fold_addr_expr(tmp));
8643 TREE_ADDRESSABLE(tmp) = 1;
8645 if (first_arg == error_mark_node)
8646 return error_mark_node;
8649 Type* fatype = bound_method->first_argument_type();
8652 if (fatype->points_to() == NULL)
8653 fatype = Type::make_pointer_type(fatype);
8654 first_arg = fold_convert(fatype->get_tree(context->gogo()), first_arg);
8655 if (first_arg == error_mark_node
8656 || TREE_TYPE(first_arg) == error_mark_node)
8657 return error_mark_node;
8660 *first_arg_ptr = first_arg;
8662 return bound_method->method()->get_tree(context);
8665 // Get the function and the first argument to use when calling an
8666 // interface method.
8669 Call_expression::interface_method_function(
8670 Translate_context* context,
8671 Interface_field_reference_expression* interface_method,
8672 tree* first_arg_ptr)
8674 tree expr = interface_method->expr()->get_tree(context);
8675 if (expr == error_mark_node)
8676 return error_mark_node;
8677 expr = save_expr(expr);
8678 tree first_arg = interface_method->get_underlying_object_tree(context, expr);
8679 if (first_arg == error_mark_node)
8680 return error_mark_node;
8681 *first_arg_ptr = first_arg;
8682 return interface_method->get_function_tree(context, expr);
8685 // Build the call expression.
8688 Call_expression::do_get_tree(Translate_context* context)
8690 if (this->tree_ != NULL_TREE)
8693 Function_type* fntype = this->get_function_type();
8695 return error_mark_node;
8697 if (this->fn_->is_error_expression())
8698 return error_mark_node;
8700 Gogo* gogo = context->gogo();
8701 source_location location = this->location();
8703 Func_expression* func = this->fn_->func_expression();
8704 Bound_method_expression* bound_method = this->fn_->bound_method_expression();
8705 Interface_field_reference_expression* interface_method =
8706 this->fn_->interface_field_reference_expression();
8707 const bool has_closure = func != NULL && func->closure() != NULL;
8708 const bool is_method = bound_method != NULL || interface_method != NULL;
8709 gcc_assert(!fntype->is_method() || is_method);
8713 if (this->args_ == NULL || this->args_->empty())
8715 nargs = is_method ? 1 : 0;
8716 args = nargs == 0 ? NULL : new tree[nargs];
8720 const Typed_identifier_list* params = fntype->parameters();
8721 gcc_assert(params != NULL);
8723 nargs = this->args_->size();
8724 int i = is_method ? 1 : 0;
8726 args = new tree[nargs];
8728 Typed_identifier_list::const_iterator pp = params->begin();
8729 Expression_list::const_iterator pe;
8730 for (pe = this->args_->begin();
8731 pe != this->args_->end();
8734 gcc_assert(pp != params->end());
8735 tree arg_val = (*pe)->get_tree(context);
8736 args[i] = Expression::convert_for_assignment(context,
8741 if (args[i] == error_mark_node)
8744 return error_mark_node;
8747 gcc_assert(pp == params->end());
8748 gcc_assert(i == nargs);
8751 tree rettype = TREE_TYPE(TREE_TYPE(fntype->get_tree(gogo)));
8752 if (rettype == error_mark_node)
8755 return error_mark_node;
8760 fn = func->get_tree_without_closure(gogo);
8761 else if (!is_method)
8762 fn = this->fn_->get_tree(context);
8763 else if (bound_method != NULL)
8764 fn = this->bound_method_function(context, bound_method, &args[0]);
8765 else if (interface_method != NULL)
8766 fn = this->interface_method_function(context, interface_method, &args[0]);
8770 if (fn == error_mark_node || TREE_TYPE(fn) == error_mark_node)
8773 return error_mark_node;
8776 // This is to support builtin math functions when using 80387 math.
8778 if (TREE_CODE(fndecl) == ADDR_EXPR)
8779 fndecl = TREE_OPERAND(fndecl, 0);
8780 tree excess_type = NULL_TREE;
8782 && DECL_IS_BUILTIN(fndecl)
8783 && DECL_BUILT_IN_CLASS(fndecl) == BUILT_IN_NORMAL
8785 && ((SCALAR_FLOAT_TYPE_P(rettype)
8786 && SCALAR_FLOAT_TYPE_P(TREE_TYPE(args[0])))
8787 || (COMPLEX_FLOAT_TYPE_P(rettype)
8788 && COMPLEX_FLOAT_TYPE_P(TREE_TYPE(args[0])))))
8790 excess_type = excess_precision_type(TREE_TYPE(args[0]));
8791 if (excess_type != NULL_TREE)
8793 tree excess_fndecl = mathfn_built_in(excess_type,
8794 DECL_FUNCTION_CODE(fndecl));
8795 if (excess_fndecl == NULL_TREE)
8796 excess_type = NULL_TREE;
8799 fn = build_fold_addr_expr_loc(location, excess_fndecl);
8800 for (int i = 0; i < nargs; ++i)
8801 args[i] = ::convert(excess_type, args[i]);
8806 tree ret = build_call_array(excess_type != NULL_TREE ? excess_type : rettype,
8810 SET_EXPR_LOCATION(ret, location);
8814 tree closure_tree = func->closure()->get_tree(context);
8815 if (closure_tree != error_mark_node)
8816 CALL_EXPR_STATIC_CHAIN(ret) = closure_tree;
8819 // If this is a recursive function type which returns itself, as in
8821 // we have used ptr_type_node for the return type. Add a cast here
8822 // to the correct type.
8823 if (TREE_TYPE(ret) == ptr_type_node)
8825 tree t = this->type()->get_tree(gogo);
8826 ret = fold_convert_loc(location, t, ret);
8829 if (excess_type != NULL_TREE)
8831 // Calling convert here can undo our excess precision change.
8832 // That may or may not be a bug in convert_to_real.
8833 ret = build1(NOP_EXPR, rettype, ret);
8836 // If there is more than one result, we will refer to the call
8838 if (fntype->results() != NULL && fntype->results()->size() > 1)
8839 ret = save_expr(ret);
8846 // Make a call expression.
8849 Expression::make_call(Expression* fn, Expression_list* args, bool is_varargs,
8850 source_location location)
8852 return new Call_expression(fn, args, is_varargs, location);
8855 // A single result from a call which returns multiple results.
8857 class Call_result_expression : public Expression
8860 Call_result_expression(Call_expression* call, unsigned int index)
8861 : Expression(EXPRESSION_CALL_RESULT, call->location()),
8862 call_(call), index_(index)
8867 do_traverse(Traverse*);
8873 do_determine_type(const Type_context*);
8876 do_check_types(Gogo*);
8881 return new Call_result_expression(this->call_->call_expression(),
8886 do_must_eval_in_order() const
8890 do_get_tree(Translate_context*);
8893 // The underlying call expression.
8895 // Which result we want.
8896 unsigned int index_;
8899 // Traverse a call result.
8902 Call_result_expression::do_traverse(Traverse* traverse)
8904 if (traverse->remember_expression(this->call_))
8906 // We have already traversed the call expression.
8907 return TRAVERSE_CONTINUE;
8909 return Expression::traverse(&this->call_, traverse);
8915 Call_result_expression::do_type()
8917 if (this->classification() == EXPRESSION_ERROR)
8918 return Type::make_error_type();
8920 // THIS->CALL_ can be replaced with a temporary reference due to
8921 // Call_expression::do_must_eval_in_order when there is an error.
8922 Call_expression* ce = this->call_->call_expression();
8925 this->set_is_error();
8926 return Type::make_error_type();
8928 Function_type* fntype = ce->get_function_type();
8931 this->set_is_error();
8932 return Type::make_error_type();
8934 const Typed_identifier_list* results = fntype->results();
8935 if (results == NULL)
8937 this->report_error(_("number of results does not match "
8938 "number of values"));
8939 return Type::make_error_type();
8941 Typed_identifier_list::const_iterator pr = results->begin();
8942 for (unsigned int i = 0; i < this->index_; ++i)
8944 if (pr == results->end())
8948 if (pr == results->end())
8950 this->report_error(_("number of results does not match "
8951 "number of values"));
8952 return Type::make_error_type();
8957 // Check the type. Just make sure that we trigger the warning in
8961 Call_result_expression::do_check_types(Gogo*)
8966 // Determine the type. We have nothing to do here, but the 0 result
8967 // needs to pass down to the caller.
8970 Call_result_expression::do_determine_type(const Type_context*)
8972 if (this->index_ == 0)
8973 this->call_->determine_type_no_context();
8979 Call_result_expression::do_get_tree(Translate_context* context)
8981 tree call_tree = this->call_->get_tree(context);
8982 if (call_tree == error_mark_node)
8983 return error_mark_node;
8984 if (TREE_CODE(TREE_TYPE(call_tree)) != RECORD_TYPE)
8986 gcc_assert(saw_errors());
8987 return error_mark_node;
8989 tree field = TYPE_FIELDS(TREE_TYPE(call_tree));
8990 for (unsigned int i = 0; i < this->index_; ++i)
8992 gcc_assert(field != NULL_TREE);
8993 field = DECL_CHAIN(field);
8995 gcc_assert(field != NULL_TREE);
8996 return build3(COMPONENT_REF, TREE_TYPE(field), call_tree, field, NULL_TREE);
8999 // Make a reference to a single result of a call which returns
9000 // multiple results.
9003 Expression::make_call_result(Call_expression* call, unsigned int index)
9005 return new Call_result_expression(call, index);
9008 // Class Index_expression.
9013 Index_expression::do_traverse(Traverse* traverse)
9015 if (Expression::traverse(&this->left_, traverse) == TRAVERSE_EXIT
9016 || Expression::traverse(&this->start_, traverse) == TRAVERSE_EXIT
9017 || (this->end_ != NULL
9018 && Expression::traverse(&this->end_, traverse) == TRAVERSE_EXIT))
9019 return TRAVERSE_EXIT;
9020 return TRAVERSE_CONTINUE;
9023 // Lower an index expression. This converts the generic index
9024 // expression into an array index, a string index, or a map index.
9027 Index_expression::do_lower(Gogo*, Named_object*, int)
9029 source_location location = this->location();
9030 Expression* left = this->left_;
9031 Expression* start = this->start_;
9032 Expression* end = this->end_;
9034 Type* type = left->type();
9035 if (type->is_error_type())
9036 return Expression::make_error(location);
9037 else if (left->is_type_expression())
9039 error_at(location, "attempt to index type expression");
9040 return Expression::make_error(location);
9042 else if (type->array_type() != NULL)
9043 return Expression::make_array_index(left, start, end, location);
9044 else if (type->points_to() != NULL
9045 && type->points_to()->array_type() != NULL
9046 && !type->points_to()->is_open_array_type())
9048 Expression* deref = Expression::make_unary(OPERATOR_MULT, left,
9050 return Expression::make_array_index(deref, start, end, location);
9052 else if (type->is_string_type())
9053 return Expression::make_string_index(left, start, end, location);
9054 else if (type->map_type() != NULL)
9058 error_at(location, "invalid slice of map");
9059 return Expression::make_error(location);
9061 Map_index_expression* ret= Expression::make_map_index(left, start,
9063 if (this->is_lvalue_)
9064 ret->set_is_lvalue();
9070 "attempt to index object which is not array, string, or map");
9071 return Expression::make_error(location);
9075 // Make an index expression.
9078 Expression::make_index(Expression* left, Expression* start, Expression* end,
9079 source_location location)
9081 return new Index_expression(left, start, end, location);
9084 // An array index. This is used for both indexing and slicing.
9086 class Array_index_expression : public Expression
9089 Array_index_expression(Expression* array, Expression* start,
9090 Expression* end, source_location location)
9091 : Expression(EXPRESSION_ARRAY_INDEX, location),
9092 array_(array), start_(start), end_(end), type_(NULL)
9097 do_traverse(Traverse*);
9103 do_determine_type(const Type_context*);
9106 do_check_types(Gogo*);
9111 return Expression::make_array_index(this->array_->copy(),
9112 this->start_->copy(),
9115 : this->end_->copy()),
9120 do_is_addressable() const;
9123 do_address_taken(bool escapes)
9124 { this->array_->address_taken(escapes); }
9127 do_get_tree(Translate_context*);
9130 // The array we are getting a value from.
9132 // The start or only index.
9134 // The end index of a slice. This may be NULL for a simple array
9135 // index, or it may be a nil expression for the length of the array.
9137 // The type of the expression.
9141 // Array index traversal.
9144 Array_index_expression::do_traverse(Traverse* traverse)
9146 if (Expression::traverse(&this->array_, traverse) == TRAVERSE_EXIT)
9147 return TRAVERSE_EXIT;
9148 if (Expression::traverse(&this->start_, traverse) == TRAVERSE_EXIT)
9149 return TRAVERSE_EXIT;
9150 if (this->end_ != NULL)
9152 if (Expression::traverse(&this->end_, traverse) == TRAVERSE_EXIT)
9153 return TRAVERSE_EXIT;
9155 return TRAVERSE_CONTINUE;
9158 // Return the type of an array index.
9161 Array_index_expression::do_type()
9163 if (this->type_ == NULL)
9165 Array_type* type = this->array_->type()->array_type();
9167 this->type_ = Type::make_error_type();
9168 else if (this->end_ == NULL)
9169 this->type_ = type->element_type();
9170 else if (type->is_open_array_type())
9172 // A slice of a slice has the same type as the original
9174 this->type_ = this->array_->type()->deref();
9178 // A slice of an array is a slice.
9179 this->type_ = Type::make_array_type(type->element_type(), NULL);
9185 // Set the type of an array index.
9188 Array_index_expression::do_determine_type(const Type_context*)
9190 this->array_->determine_type_no_context();
9191 this->start_->determine_type_no_context();
9192 if (this->end_ != NULL)
9193 this->end_->determine_type_no_context();
9196 // Check types of an array index.
9199 Array_index_expression::do_check_types(Gogo*)
9201 if (this->start_->type()->integer_type() == NULL)
9202 this->report_error(_("index must be integer"));
9203 if (this->end_ != NULL
9204 && this->end_->type()->integer_type() == NULL
9205 && !this->end_->is_nil_expression())
9206 this->report_error(_("slice end must be integer"));
9208 Array_type* array_type = this->array_->type()->array_type();
9209 if (array_type == NULL)
9211 gcc_assert(this->array_->type()->is_error_type());
9215 unsigned int int_bits =
9216 Type::lookup_integer_type("int")->integer_type()->bits();
9221 bool lval_valid = (array_type->length() != NULL
9222 && array_type->length()->integer_constant_value(true,
9227 if (this->start_->integer_constant_value(true, ival, &dummy))
9229 if (mpz_sgn(ival) < 0
9230 || mpz_sizeinbase(ival, 2) >= int_bits
9232 && (this->end_ == NULL
9233 ? mpz_cmp(ival, lval) >= 0
9234 : mpz_cmp(ival, lval) > 0)))
9236 error_at(this->start_->location(), "array index out of bounds");
9237 this->set_is_error();
9240 if (this->end_ != NULL && !this->end_->is_nil_expression())
9242 if (this->end_->integer_constant_value(true, ival, &dummy))
9244 if (mpz_sgn(ival) < 0
9245 || mpz_sizeinbase(ival, 2) >= int_bits
9246 || (lval_valid && mpz_cmp(ival, lval) > 0))
9248 error_at(this->end_->location(), "array index out of bounds");
9249 this->set_is_error();
9256 // A slice of an array requires an addressable array. A slice of a
9257 // slice is always possible.
9258 if (this->end_ != NULL
9259 && !array_type->is_open_array_type()
9260 && !this->array_->is_addressable())
9261 this->report_error(_("array is not addressable"));
9264 // Return whether this expression is addressable.
9267 Array_index_expression::do_is_addressable() const
9269 // A slice expression is not addressable.
9270 if (this->end_ != NULL)
9273 // An index into a slice is addressable.
9274 if (this->array_->type()->is_open_array_type())
9277 // An index into an array is addressable if the array is
9279 return this->array_->is_addressable();
9282 // Get a tree for an array index.
9285 Array_index_expression::do_get_tree(Translate_context* context)
9287 Gogo* gogo = context->gogo();
9288 source_location loc = this->location();
9290 Array_type* array_type = this->array_->type()->array_type();
9291 if (array_type == NULL)
9293 gcc_assert(this->array_->type()->is_error_type());
9294 return error_mark_node;
9297 tree type_tree = array_type->get_tree(gogo);
9298 if (type_tree == error_mark_node)
9299 return error_mark_node;
9301 tree array_tree = this->array_->get_tree(context);
9302 if (array_tree == error_mark_node)
9303 return error_mark_node;
9305 if (array_type->length() == NULL && !DECL_P(array_tree))
9306 array_tree = save_expr(array_tree);
9307 tree length_tree = array_type->length_tree(gogo, array_tree);
9308 if (length_tree == error_mark_node)
9309 return error_mark_node;
9310 length_tree = save_expr(length_tree);
9311 tree length_type = TREE_TYPE(length_tree);
9313 tree bad_index = boolean_false_node;
9315 tree start_tree = this->start_->get_tree(context);
9316 if (start_tree == error_mark_node)
9317 return error_mark_node;
9318 if (!DECL_P(start_tree))
9319 start_tree = save_expr(start_tree);
9320 if (!INTEGRAL_TYPE_P(TREE_TYPE(start_tree)))
9321 start_tree = convert_to_integer(length_type, start_tree);
9323 bad_index = Expression::check_bounds(start_tree, length_type, bad_index,
9326 start_tree = fold_convert_loc(loc, length_type, start_tree);
9327 bad_index = fold_build2_loc(loc, TRUTH_OR_EXPR, boolean_type_node, bad_index,
9328 fold_build2_loc(loc,
9332 boolean_type_node, start_tree,
9335 int code = (array_type->length() != NULL
9336 ? (this->end_ == NULL
9337 ? RUNTIME_ERROR_ARRAY_INDEX_OUT_OF_BOUNDS
9338 : RUNTIME_ERROR_ARRAY_SLICE_OUT_OF_BOUNDS)
9339 : (this->end_ == NULL
9340 ? RUNTIME_ERROR_SLICE_INDEX_OUT_OF_BOUNDS
9341 : RUNTIME_ERROR_SLICE_SLICE_OUT_OF_BOUNDS));
9342 tree crash = Gogo::runtime_error(code, loc);
9344 if (this->end_ == NULL)
9346 // Simple array indexing. This has to return an l-value, so
9347 // wrap the index check into START_TREE.
9348 start_tree = build2(COMPOUND_EXPR, TREE_TYPE(start_tree),
9349 build3(COND_EXPR, void_type_node,
9350 bad_index, crash, NULL_TREE),
9352 start_tree = fold_convert_loc(loc, sizetype, start_tree);
9354 if (array_type->length() != NULL)
9357 return build4(ARRAY_REF, TREE_TYPE(type_tree), array_tree,
9358 start_tree, NULL_TREE, NULL_TREE);
9363 tree values = array_type->value_pointer_tree(gogo, array_tree);
9364 tree element_type_tree = array_type->element_type()->get_tree(gogo);
9365 if (element_type_tree == error_mark_node)
9366 return error_mark_node;
9367 tree element_size = TYPE_SIZE_UNIT(element_type_tree);
9368 tree offset = fold_build2_loc(loc, MULT_EXPR, sizetype,
9369 start_tree, element_size);
9370 tree ptr = fold_build2_loc(loc, POINTER_PLUS_EXPR,
9371 TREE_TYPE(values), values, offset);
9372 return build_fold_indirect_ref(ptr);
9378 tree capacity_tree = array_type->capacity_tree(gogo, array_tree);
9379 if (capacity_tree == error_mark_node)
9380 return error_mark_node;
9381 capacity_tree = fold_convert_loc(loc, length_type, capacity_tree);
9384 if (this->end_->is_nil_expression())
9385 end_tree = length_tree;
9388 end_tree = this->end_->get_tree(context);
9389 if (end_tree == error_mark_node)
9390 return error_mark_node;
9391 if (!DECL_P(end_tree))
9392 end_tree = save_expr(end_tree);
9393 if (!INTEGRAL_TYPE_P(TREE_TYPE(end_tree)))
9394 end_tree = convert_to_integer(length_type, end_tree);
9396 bad_index = Expression::check_bounds(end_tree, length_type, bad_index,
9399 end_tree = fold_convert_loc(loc, length_type, end_tree);
9401 capacity_tree = save_expr(capacity_tree);
9402 tree bad_end = fold_build2_loc(loc, TRUTH_OR_EXPR, boolean_type_node,
9403 fold_build2_loc(loc, LT_EXPR,
9405 end_tree, start_tree),
9406 fold_build2_loc(loc, GT_EXPR,
9408 end_tree, capacity_tree));
9409 bad_index = fold_build2_loc(loc, TRUTH_OR_EXPR, boolean_type_node,
9410 bad_index, bad_end);
9413 tree element_type_tree = array_type->element_type()->get_tree(gogo);
9414 if (element_type_tree == error_mark_node)
9415 return error_mark_node;
9416 tree element_size = TYPE_SIZE_UNIT(element_type_tree);
9418 tree offset = fold_build2_loc(loc, MULT_EXPR, sizetype,
9419 fold_convert_loc(loc, sizetype, start_tree),
9422 tree value_pointer = array_type->value_pointer_tree(gogo, array_tree);
9423 if (value_pointer == error_mark_node)
9424 return error_mark_node;
9426 value_pointer = fold_build2_loc(loc, POINTER_PLUS_EXPR,
9427 TREE_TYPE(value_pointer),
9428 value_pointer, offset);
9430 tree result_length_tree = fold_build2_loc(loc, MINUS_EXPR, length_type,
9431 end_tree, start_tree);
9433 tree result_capacity_tree = fold_build2_loc(loc, MINUS_EXPR, length_type,
9434 capacity_tree, start_tree);
9436 tree struct_tree = this->type()->get_tree(gogo);
9437 gcc_assert(TREE_CODE(struct_tree) == RECORD_TYPE);
9439 VEC(constructor_elt,gc)* init = VEC_alloc(constructor_elt, gc, 3);
9441 constructor_elt* elt = VEC_quick_push(constructor_elt, init, NULL);
9442 tree field = TYPE_FIELDS(struct_tree);
9443 gcc_assert(strcmp(IDENTIFIER_POINTER(DECL_NAME(field)), "__values") == 0);
9445 elt->value = value_pointer;
9447 elt = VEC_quick_push(constructor_elt, init, NULL);
9448 field = DECL_CHAIN(field);
9449 gcc_assert(strcmp(IDENTIFIER_POINTER(DECL_NAME(field)), "__count") == 0);
9451 elt->value = fold_convert_loc(loc, TREE_TYPE(field), result_length_tree);
9453 elt = VEC_quick_push(constructor_elt, init, NULL);
9454 field = DECL_CHAIN(field);
9455 gcc_assert(strcmp(IDENTIFIER_POINTER(DECL_NAME(field)), "__capacity") == 0);
9457 elt->value = fold_convert_loc(loc, TREE_TYPE(field), result_capacity_tree);
9459 tree constructor = build_constructor(struct_tree, init);
9461 if (TREE_CONSTANT(value_pointer)
9462 && TREE_CONSTANT(result_length_tree)
9463 && TREE_CONSTANT(result_capacity_tree))
9464 TREE_CONSTANT(constructor) = 1;
9466 return fold_build2_loc(loc, COMPOUND_EXPR, TREE_TYPE(constructor),
9467 build3(COND_EXPR, void_type_node,
9468 bad_index, crash, NULL_TREE),
9472 // Make an array index expression. END may be NULL.
9475 Expression::make_array_index(Expression* array, Expression* start,
9476 Expression* end, source_location location)
9478 // Taking a slice of a composite literal requires moving the literal
9480 if (end != NULL && array->is_composite_literal())
9482 array = Expression::make_heap_composite(array, location);
9483 array = Expression::make_unary(OPERATOR_MULT, array, location);
9485 return new Array_index_expression(array, start, end, location);
9488 // A string index. This is used for both indexing and slicing.
9490 class String_index_expression : public Expression
9493 String_index_expression(Expression* string, Expression* start,
9494 Expression* end, source_location location)
9495 : Expression(EXPRESSION_STRING_INDEX, location),
9496 string_(string), start_(start), end_(end)
9501 do_traverse(Traverse*);
9507 do_determine_type(const Type_context*);
9510 do_check_types(Gogo*);
9515 return Expression::make_string_index(this->string_->copy(),
9516 this->start_->copy(),
9519 : this->end_->copy()),
9524 do_get_tree(Translate_context*);
9527 // The string we are getting a value from.
9528 Expression* string_;
9529 // The start or only index.
9531 // The end index of a slice. This may be NULL for a single index,
9532 // or it may be a nil expression for the length of the string.
9536 // String index traversal.
9539 String_index_expression::do_traverse(Traverse* traverse)
9541 if (Expression::traverse(&this->string_, traverse) == TRAVERSE_EXIT)
9542 return TRAVERSE_EXIT;
9543 if (Expression::traverse(&this->start_, traverse) == TRAVERSE_EXIT)
9544 return TRAVERSE_EXIT;
9545 if (this->end_ != NULL)
9547 if (Expression::traverse(&this->end_, traverse) == TRAVERSE_EXIT)
9548 return TRAVERSE_EXIT;
9550 return TRAVERSE_CONTINUE;
9553 // Return the type of a string index.
9556 String_index_expression::do_type()
9558 if (this->end_ == NULL)
9559 return Type::lookup_integer_type("uint8");
9561 return this->string_->type();
9564 // Determine the type of a string index.
9567 String_index_expression::do_determine_type(const Type_context*)
9569 this->string_->determine_type_no_context();
9570 Type_context subcontext(NULL, true);
9571 this->start_->determine_type(&subcontext);
9572 if (this->end_ != NULL)
9573 this->end_->determine_type(&subcontext);
9576 // Check types of a string index.
9579 String_index_expression::do_check_types(Gogo*)
9581 if (this->start_->type()->integer_type() == NULL)
9582 this->report_error(_("index must be integer"));
9583 if (this->end_ != NULL
9584 && this->end_->type()->integer_type() == NULL
9585 && !this->end_->is_nil_expression())
9586 this->report_error(_("slice end must be integer"));
9589 bool sval_valid = this->string_->string_constant_value(&sval);
9594 if (this->start_->integer_constant_value(true, ival, &dummy))
9596 if (mpz_sgn(ival) < 0
9597 || (sval_valid && mpz_cmp_ui(ival, sval.length()) >= 0))
9599 error_at(this->start_->location(), "string index out of bounds");
9600 this->set_is_error();
9603 if (this->end_ != NULL && !this->end_->is_nil_expression())
9605 if (this->end_->integer_constant_value(true, ival, &dummy))
9607 if (mpz_sgn(ival) < 0
9608 || (sval_valid && mpz_cmp_ui(ival, sval.length()) > 0))
9610 error_at(this->end_->location(), "string index out of bounds");
9611 this->set_is_error();
9618 // Get a tree for a string index.
9621 String_index_expression::do_get_tree(Translate_context* context)
9623 source_location loc = this->location();
9625 tree string_tree = this->string_->get_tree(context);
9626 if (string_tree == error_mark_node)
9627 return error_mark_node;
9629 if (this->string_->type()->points_to() != NULL)
9630 string_tree = build_fold_indirect_ref(string_tree);
9631 if (!DECL_P(string_tree))
9632 string_tree = save_expr(string_tree);
9633 tree string_type = TREE_TYPE(string_tree);
9635 tree length_tree = String_type::length_tree(context->gogo(), string_tree);
9636 length_tree = save_expr(length_tree);
9637 tree length_type = TREE_TYPE(length_tree);
9639 tree bad_index = boolean_false_node;
9641 tree start_tree = this->start_->get_tree(context);
9642 if (start_tree == error_mark_node)
9643 return error_mark_node;
9644 if (!DECL_P(start_tree))
9645 start_tree = save_expr(start_tree);
9646 if (!INTEGRAL_TYPE_P(TREE_TYPE(start_tree)))
9647 start_tree = convert_to_integer(length_type, start_tree);
9649 bad_index = Expression::check_bounds(start_tree, length_type, bad_index,
9652 start_tree = fold_convert_loc(loc, length_type, start_tree);
9654 int code = (this->end_ == NULL
9655 ? RUNTIME_ERROR_STRING_INDEX_OUT_OF_BOUNDS
9656 : RUNTIME_ERROR_STRING_SLICE_OUT_OF_BOUNDS);
9657 tree crash = Gogo::runtime_error(code, loc);
9659 if (this->end_ == NULL)
9661 bad_index = fold_build2_loc(loc, TRUTH_OR_EXPR, boolean_type_node,
9663 fold_build2_loc(loc, GE_EXPR,
9665 start_tree, length_tree));
9667 tree bytes_tree = String_type::bytes_tree(context->gogo(), string_tree);
9668 tree ptr = fold_build2_loc(loc, POINTER_PLUS_EXPR, TREE_TYPE(bytes_tree),
9670 fold_convert_loc(loc, sizetype, start_tree));
9671 tree index = build_fold_indirect_ref_loc(loc, ptr);
9673 return build2(COMPOUND_EXPR, TREE_TYPE(index),
9674 build3(COND_EXPR, void_type_node,
9675 bad_index, crash, NULL_TREE),
9681 if (this->end_->is_nil_expression())
9682 end_tree = build_int_cst(length_type, -1);
9685 end_tree = this->end_->get_tree(context);
9686 if (end_tree == error_mark_node)
9687 return error_mark_node;
9688 if (!DECL_P(end_tree))
9689 end_tree = save_expr(end_tree);
9690 if (!INTEGRAL_TYPE_P(TREE_TYPE(end_tree)))
9691 end_tree = convert_to_integer(length_type, end_tree);
9693 bad_index = Expression::check_bounds(end_tree, length_type,
9696 end_tree = fold_convert_loc(loc, length_type, end_tree);
9699 static tree strslice_fndecl;
9700 tree ret = Gogo::call_builtin(&strslice_fndecl,
9702 "__go_string_slice",
9711 if (ret == error_mark_node)
9712 return error_mark_node;
9713 // This will panic if the bounds are out of range for the
9715 TREE_NOTHROW(strslice_fndecl) = 0;
9717 if (bad_index == boolean_false_node)
9720 return build2(COMPOUND_EXPR, TREE_TYPE(ret),
9721 build3(COND_EXPR, void_type_node,
9722 bad_index, crash, NULL_TREE),
9727 // Make a string index expression. END may be NULL.
9730 Expression::make_string_index(Expression* string, Expression* start,
9731 Expression* end, source_location location)
9733 return new String_index_expression(string, start, end, location);
9738 // Get the type of the map.
9741 Map_index_expression::get_map_type() const
9743 Map_type* mt = this->map_->type()->deref()->map_type();
9745 gcc_assert(saw_errors());
9749 // Map index traversal.
9752 Map_index_expression::do_traverse(Traverse* traverse)
9754 if (Expression::traverse(&this->map_, traverse) == TRAVERSE_EXIT)
9755 return TRAVERSE_EXIT;
9756 return Expression::traverse(&this->index_, traverse);
9759 // Return the type of a map index.
9762 Map_index_expression::do_type()
9764 Map_type* mt = this->get_map_type();
9766 return Type::make_error_type();
9767 Type* type = mt->val_type();
9768 // If this map index is in a tuple assignment, we actually return a
9769 // pointer to the value type. Tuple_map_assignment_statement is
9770 // responsible for handling this correctly. We need to get the type
9771 // right in case this gets assigned to a temporary variable.
9772 if (this->is_in_tuple_assignment_)
9773 type = Type::make_pointer_type(type);
9777 // Fix the type of a map index.
9780 Map_index_expression::do_determine_type(const Type_context*)
9782 this->map_->determine_type_no_context();
9783 Map_type* mt = this->get_map_type();
9784 Type* key_type = mt == NULL ? NULL : mt->key_type();
9785 Type_context subcontext(key_type, false);
9786 this->index_->determine_type(&subcontext);
9789 // Check types of a map index.
9792 Map_index_expression::do_check_types(Gogo*)
9795 Map_type* mt = this->get_map_type();
9798 if (!Type::are_assignable(mt->key_type(), this->index_->type(), &reason))
9801 this->report_error(_("incompatible type for map index"));
9804 error_at(this->location(), "incompatible type for map index (%s)",
9806 this->set_is_error();
9811 // Get a tree for a map index.
9814 Map_index_expression::do_get_tree(Translate_context* context)
9816 Map_type* type = this->get_map_type();
9818 return error_mark_node;
9820 tree valptr = this->get_value_pointer(context, this->is_lvalue_);
9821 if (valptr == error_mark_node)
9822 return error_mark_node;
9823 valptr = save_expr(valptr);
9825 tree val_type_tree = TREE_TYPE(TREE_TYPE(valptr));
9827 if (this->is_lvalue_)
9828 return build_fold_indirect_ref(valptr);
9829 else if (this->is_in_tuple_assignment_)
9831 // Tuple_map_assignment_statement is responsible for using this
9837 return fold_build3(COND_EXPR, val_type_tree,
9838 fold_build2(EQ_EXPR, boolean_type_node, valptr,
9839 fold_convert(TREE_TYPE(valptr),
9840 null_pointer_node)),
9841 type->val_type()->get_init_tree(context->gogo(),
9843 build_fold_indirect_ref(valptr));
9847 // Get a tree for the map index. This returns a tree which evaluates
9848 // to a pointer to a value. The pointer will be NULL if the key is
9852 Map_index_expression::get_value_pointer(Translate_context* context,
9855 Map_type* type = this->get_map_type();
9857 return error_mark_node;
9859 tree map_tree = this->map_->get_tree(context);
9860 tree index_tree = this->index_->get_tree(context);
9861 index_tree = Expression::convert_for_assignment(context, type->key_type(),
9862 this->index_->type(),
9865 if (map_tree == error_mark_node || index_tree == error_mark_node)
9866 return error_mark_node;
9868 if (this->map_->type()->points_to() != NULL)
9869 map_tree = build_fold_indirect_ref(map_tree);
9871 // We need to pass in a pointer to the key, so stuff it into a
9873 tree tmp = create_tmp_var(TREE_TYPE(index_tree), get_name(index_tree));
9874 DECL_IGNORED_P(tmp) = 0;
9875 DECL_INITIAL(tmp) = index_tree;
9876 tree make_tmp = build1(DECL_EXPR, void_type_node, tmp);
9877 tree tmpref = fold_convert(const_ptr_type_node, build_fold_addr_expr(tmp));
9878 TREE_ADDRESSABLE(tmp) = 1;
9880 static tree map_index_fndecl;
9881 tree call = Gogo::call_builtin(&map_index_fndecl,
9885 const_ptr_type_node,
9886 TREE_TYPE(map_tree),
9888 const_ptr_type_node,
9893 : boolean_false_node));
9894 if (call == error_mark_node)
9895 return error_mark_node;
9896 // This can panic on a map of interface type if the interface holds
9897 // an uncomparable or unhashable type.
9898 TREE_NOTHROW(map_index_fndecl) = 0;
9900 tree val_type_tree = type->val_type()->get_tree(context->gogo());
9901 if (val_type_tree == error_mark_node)
9902 return error_mark_node;
9903 tree ptr_val_type_tree = build_pointer_type(val_type_tree);
9905 return build2(COMPOUND_EXPR, ptr_val_type_tree,
9907 fold_convert(ptr_val_type_tree, call));
9910 // Make a map index expression.
9912 Map_index_expression*
9913 Expression::make_map_index(Expression* map, Expression* index,
9914 source_location location)
9916 return new Map_index_expression(map, index, location);
9919 // Class Field_reference_expression.
9921 // Return the type of a field reference.
9924 Field_reference_expression::do_type()
9926 Type* type = this->expr_->type();
9927 if (type->is_error_type())
9929 Struct_type* struct_type = type->struct_type();
9930 gcc_assert(struct_type != NULL);
9931 return struct_type->field(this->field_index_)->type();
9934 // Check the types for a field reference.
9937 Field_reference_expression::do_check_types(Gogo*)
9939 Type* type = this->expr_->type();
9940 if (type->is_error_type())
9942 Struct_type* struct_type = type->struct_type();
9943 gcc_assert(struct_type != NULL);
9944 gcc_assert(struct_type->field(this->field_index_) != NULL);
9947 // Get a tree for a field reference.
9950 Field_reference_expression::do_get_tree(Translate_context* context)
9952 tree struct_tree = this->expr_->get_tree(context);
9953 if (struct_tree == error_mark_node
9954 || TREE_TYPE(struct_tree) == error_mark_node)
9955 return error_mark_node;
9956 gcc_assert(TREE_CODE(TREE_TYPE(struct_tree)) == RECORD_TYPE);
9957 tree field = TYPE_FIELDS(TREE_TYPE(struct_tree));
9958 if (field == NULL_TREE)
9960 // This can happen for a type which refers to itself indirectly
9961 // and then turns out to be erroneous.
9962 gcc_assert(saw_errors());
9963 return error_mark_node;
9965 for (unsigned int i = this->field_index_; i > 0; --i)
9967 field = DECL_CHAIN(field);
9968 gcc_assert(field != NULL_TREE);
9970 if (TREE_TYPE(field) == error_mark_node)
9971 return error_mark_node;
9972 return build3(COMPONENT_REF, TREE_TYPE(field), struct_tree, field,
9976 // Make a reference to a qualified identifier in an expression.
9978 Field_reference_expression*
9979 Expression::make_field_reference(Expression* expr, unsigned int field_index,
9980 source_location location)
9982 return new Field_reference_expression(expr, field_index, location);
9985 // Class Interface_field_reference_expression.
9987 // Return a tree for the pointer to the function to call.
9990 Interface_field_reference_expression::get_function_tree(Translate_context*,
9993 if (this->expr_->type()->points_to() != NULL)
9994 expr = build_fold_indirect_ref(expr);
9996 tree expr_type = TREE_TYPE(expr);
9997 gcc_assert(TREE_CODE(expr_type) == RECORD_TYPE);
9999 tree field = TYPE_FIELDS(expr_type);
10000 gcc_assert(strcmp(IDENTIFIER_POINTER(DECL_NAME(field)), "__methods") == 0);
10002 tree table = build3(COMPONENT_REF, TREE_TYPE(field), expr, field, NULL_TREE);
10003 gcc_assert(POINTER_TYPE_P(TREE_TYPE(table)));
10005 table = build_fold_indirect_ref(table);
10006 gcc_assert(TREE_CODE(TREE_TYPE(table)) == RECORD_TYPE);
10008 std::string name = Gogo::unpack_hidden_name(this->name_);
10009 for (field = DECL_CHAIN(TYPE_FIELDS(TREE_TYPE(table)));
10010 field != NULL_TREE;
10011 field = DECL_CHAIN(field))
10013 if (name == IDENTIFIER_POINTER(DECL_NAME(field)))
10016 gcc_assert(field != NULL_TREE);
10018 return build3(COMPONENT_REF, TREE_TYPE(field), table, field, NULL_TREE);
10021 // Return a tree for the first argument to pass to the interface
10025 Interface_field_reference_expression::get_underlying_object_tree(
10026 Translate_context*,
10029 if (this->expr_->type()->points_to() != NULL)
10030 expr = build_fold_indirect_ref(expr);
10032 tree expr_type = TREE_TYPE(expr);
10033 gcc_assert(TREE_CODE(expr_type) == RECORD_TYPE);
10035 tree field = DECL_CHAIN(TYPE_FIELDS(expr_type));
10036 gcc_assert(strcmp(IDENTIFIER_POINTER(DECL_NAME(field)), "__object") == 0);
10038 return build3(COMPONENT_REF, TREE_TYPE(field), expr, field, NULL_TREE);
10044 Interface_field_reference_expression::do_traverse(Traverse* traverse)
10046 return Expression::traverse(&this->expr_, traverse);
10049 // Return the type of an interface field reference.
10052 Interface_field_reference_expression::do_type()
10054 Type* expr_type = this->expr_->type();
10056 Type* points_to = expr_type->points_to();
10057 if (points_to != NULL)
10058 expr_type = points_to;
10060 Interface_type* interface_type = expr_type->interface_type();
10061 if (interface_type == NULL)
10062 return Type::make_error_type();
10064 const Typed_identifier* method = interface_type->find_method(this->name_);
10065 if (method == NULL)
10066 return Type::make_error_type();
10068 return method->type();
10071 // Determine types.
10074 Interface_field_reference_expression::do_determine_type(const Type_context*)
10076 this->expr_->determine_type_no_context();
10079 // Check the types for an interface field reference.
10082 Interface_field_reference_expression::do_check_types(Gogo*)
10084 Type* type = this->expr_->type();
10086 Type* points_to = type->points_to();
10087 if (points_to != NULL)
10090 Interface_type* interface_type = type->interface_type();
10091 if (interface_type == NULL)
10092 this->report_error(_("expected interface or pointer to interface"));
10095 const Typed_identifier* method =
10096 interface_type->find_method(this->name_);
10097 if (method == NULL)
10099 error_at(this->location(), "method %qs not in interface",
10100 Gogo::message_name(this->name_).c_str());
10101 this->set_is_error();
10106 // Get a tree for a reference to a field in an interface. There is no
10107 // standard tree type representation for this: it's a function
10108 // attached to its first argument, like a Bound_method_expression.
10109 // The only places it may currently be used are in a Call_expression
10110 // or a Go_statement, which will take it apart directly. So this has
10111 // nothing to do at present.
10114 Interface_field_reference_expression::do_get_tree(Translate_context*)
10119 // Make a reference to a field in an interface.
10122 Expression::make_interface_field_reference(Expression* expr,
10123 const std::string& field,
10124 source_location location)
10126 return new Interface_field_reference_expression(expr, field, location);
10129 // A general selector. This is a Parser_expression for LEFT.NAME. It
10130 // is lowered after we know the type of the left hand side.
10132 class Selector_expression : public Parser_expression
10135 Selector_expression(Expression* left, const std::string& name,
10136 source_location location)
10137 : Parser_expression(EXPRESSION_SELECTOR, location),
10138 left_(left), name_(name)
10143 do_traverse(Traverse* traverse)
10144 { return Expression::traverse(&this->left_, traverse); }
10147 do_lower(Gogo*, Named_object*, int);
10152 return new Selector_expression(this->left_->copy(), this->name_,
10158 lower_method_expression(Gogo*);
10160 // The expression on the left hand side.
10162 // The name on the right hand side.
10166 // Lower a selector expression once we know the real type of the left
10170 Selector_expression::do_lower(Gogo* gogo, Named_object*, int)
10172 Expression* left = this->left_;
10173 if (left->is_type_expression())
10174 return this->lower_method_expression(gogo);
10175 return Type::bind_field_or_method(gogo, left->type(), left, this->name_,
10179 // Lower a method expression T.M or (*T).M. We turn this into a
10180 // function literal.
10183 Selector_expression::lower_method_expression(Gogo* gogo)
10185 source_location location = this->location();
10186 Type* type = this->left_->type();
10187 const std::string& name(this->name_);
10190 if (type->points_to() == NULL)
10191 is_pointer = false;
10195 type = type->points_to();
10197 Named_type* nt = type->named_type();
10201 ("method expression requires named type or "
10202 "pointer to named type"));
10203 return Expression::make_error(location);
10207 Method* method = nt->method_function(name, &is_ambiguous);
10208 if (method == NULL)
10211 error_at(location, "type %<%s%> has no method %<%s%>",
10212 nt->message_name().c_str(),
10213 Gogo::message_name(name).c_str());
10215 error_at(location, "method %<%s%> is ambiguous in type %<%s%>",
10216 Gogo::message_name(name).c_str(),
10217 nt->message_name().c_str());
10218 return Expression::make_error(location);
10221 if (!is_pointer && !method->is_value_method())
10223 error_at(location, "method requires pointer (use %<(*%s).%s)%>",
10224 nt->message_name().c_str(),
10225 Gogo::message_name(name).c_str());
10226 return Expression::make_error(location);
10229 // Build a new function type in which the receiver becomes the first
10231 Function_type* method_type = method->type();
10232 gcc_assert(method_type->is_method());
10234 const char* const receiver_name = "$this";
10235 Typed_identifier_list* parameters = new Typed_identifier_list();
10236 parameters->push_back(Typed_identifier(receiver_name, this->left_->type(),
10239 const Typed_identifier_list* method_parameters = method_type->parameters();
10240 if (method_parameters != NULL)
10242 for (Typed_identifier_list::const_iterator p = method_parameters->begin();
10243 p != method_parameters->end();
10245 parameters->push_back(*p);
10248 const Typed_identifier_list* method_results = method_type->results();
10249 Typed_identifier_list* results;
10250 if (method_results == NULL)
10254 results = new Typed_identifier_list();
10255 for (Typed_identifier_list::const_iterator p = method_results->begin();
10256 p != method_results->end();
10258 results->push_back(*p);
10261 Function_type* fntype = Type::make_function_type(NULL, parameters, results,
10263 if (method_type->is_varargs())
10264 fntype->set_is_varargs();
10266 // We generate methods which always takes a pointer to the receiver
10267 // as their first argument. If this is for a pointer type, we can
10268 // simply reuse the existing function. We use an internal hack to
10269 // get the right type.
10273 Named_object* mno = (method->needs_stub_method()
10274 ? method->stub_object()
10275 : method->named_object());
10276 Expression* f = Expression::make_func_reference(mno, NULL, location);
10277 f = Expression::make_cast(fntype, f, location);
10278 Type_conversion_expression* tce =
10279 static_cast<Type_conversion_expression*>(f);
10280 tce->set_may_convert_function_types();
10284 Named_object* no = gogo->start_function(Gogo::thunk_name(), fntype, false,
10287 Named_object* vno = gogo->lookup(receiver_name, NULL);
10288 gcc_assert(vno != NULL);
10289 Expression* ve = Expression::make_var_reference(vno, location);
10290 Expression* bm = Type::bind_field_or_method(gogo, nt, ve, name, location);
10292 // Even though we found the method above, if it has an error type we
10293 // may see an error here.
10294 if (bm->is_error_expression())
10296 gogo->finish_function(location);
10300 Expression_list* args;
10301 if (method_parameters == NULL)
10305 args = new Expression_list();
10306 for (Typed_identifier_list::const_iterator p = method_parameters->begin();
10307 p != method_parameters->end();
10310 vno = gogo->lookup(p->name(), NULL);
10311 gcc_assert(vno != NULL);
10312 args->push_back(Expression::make_var_reference(vno, location));
10316 Call_expression* call = Expression::make_call(bm, args,
10317 method_type->is_varargs(),
10320 size_t count = call->result_count();
10323 s = Statement::make_statement(call);
10326 Expression_list* retvals = new Expression_list();
10328 retvals->push_back(call);
10331 for (size_t i = 0; i < count; ++i)
10332 retvals->push_back(Expression::make_call_result(call, i));
10334 s = Statement::make_return_statement(no->func_value()->type()->results(),
10335 retvals, location);
10337 gogo->add_statement(s);
10339 gogo->finish_function(location);
10341 return Expression::make_func_reference(no, NULL, location);
10344 // Make a selector expression.
10347 Expression::make_selector(Expression* left, const std::string& name,
10348 source_location location)
10350 return new Selector_expression(left, name, location);
10353 // Implement the builtin function new.
10355 class Allocation_expression : public Expression
10358 Allocation_expression(Type* type, source_location location)
10359 : Expression(EXPRESSION_ALLOCATION, location),
10365 do_traverse(Traverse* traverse)
10366 { return Type::traverse(this->type_, traverse); }
10370 { return Type::make_pointer_type(this->type_); }
10373 do_determine_type(const Type_context*)
10377 do_check_types(Gogo*);
10381 { return new Allocation_expression(this->type_, this->location()); }
10384 do_get_tree(Translate_context*);
10387 // The type we are allocating.
10391 // Check the type of an allocation expression.
10394 Allocation_expression::do_check_types(Gogo*)
10396 if (this->type_->function_type() != NULL)
10397 this->report_error(_("invalid new of function type"));
10400 // Return a tree for an allocation expression.
10403 Allocation_expression::do_get_tree(Translate_context* context)
10405 tree type_tree = this->type_->get_tree(context->gogo());
10406 if (type_tree == error_mark_node)
10407 return error_mark_node;
10408 tree size_tree = TYPE_SIZE_UNIT(type_tree);
10409 tree space = context->gogo()->allocate_memory(this->type_, size_tree,
10411 if (space == error_mark_node)
10412 return error_mark_node;
10413 return fold_convert(build_pointer_type(type_tree), space);
10416 // Make an allocation expression.
10419 Expression::make_allocation(Type* type, source_location location)
10421 return new Allocation_expression(type, location);
10424 // Implement the builtin function make.
10426 class Make_expression : public Expression
10429 Make_expression(Type* type, Expression_list* args, source_location location)
10430 : Expression(EXPRESSION_MAKE, location),
10431 type_(type), args_(args)
10436 do_traverse(Traverse* traverse);
10440 { return this->type_; }
10443 do_determine_type(const Type_context*);
10446 do_check_types(Gogo*);
10451 return new Make_expression(this->type_, this->args_->copy(),
10456 do_get_tree(Translate_context*);
10459 // The type we are making.
10461 // The arguments to pass to the make routine.
10462 Expression_list* args_;
10468 Make_expression::do_traverse(Traverse* traverse)
10470 if (this->args_ != NULL
10471 && this->args_->traverse(traverse) == TRAVERSE_EXIT)
10472 return TRAVERSE_EXIT;
10473 if (Type::traverse(this->type_, traverse) == TRAVERSE_EXIT)
10474 return TRAVERSE_EXIT;
10475 return TRAVERSE_CONTINUE;
10478 // Set types of arguments.
10481 Make_expression::do_determine_type(const Type_context*)
10483 if (this->args_ != NULL)
10485 Type_context context(Type::lookup_integer_type("int"), false);
10486 for (Expression_list::const_iterator pe = this->args_->begin();
10487 pe != this->args_->end();
10489 (*pe)->determine_type(&context);
10493 // Check types for a make expression.
10496 Make_expression::do_check_types(Gogo*)
10498 if (this->type_->channel_type() == NULL
10499 && this->type_->map_type() == NULL
10500 && (this->type_->array_type() == NULL
10501 || this->type_->array_type()->length() != NULL))
10502 this->report_error(_("invalid type for make function"));
10503 else if (!this->type_->check_make_expression(this->args_, this->location()))
10504 this->set_is_error();
10507 // Return a tree for a make expression.
10510 Make_expression::do_get_tree(Translate_context* context)
10512 return this->type_->make_expression_tree(context, this->args_,
10516 // Make a make expression.
10519 Expression::make_make(Type* type, Expression_list* args,
10520 source_location location)
10522 return new Make_expression(type, args, location);
10525 // Construct a struct.
10527 class Struct_construction_expression : public Expression
10530 Struct_construction_expression(Type* type, Expression_list* vals,
10531 source_location location)
10532 : Expression(EXPRESSION_STRUCT_CONSTRUCTION, location),
10533 type_(type), vals_(vals)
10536 // Return whether this is a constant initializer.
10538 is_constant_struct() const;
10542 do_traverse(Traverse* traverse);
10546 { return this->type_; }
10549 do_determine_type(const Type_context*);
10552 do_check_types(Gogo*);
10557 return new Struct_construction_expression(this->type_, this->vals_->copy(),
10562 do_is_addressable() const
10566 do_get_tree(Translate_context*);
10569 do_export(Export*) const;
10572 // The type of the struct to construct.
10574 // The list of values, in order of the fields in the struct. A NULL
10575 // entry means that the field should be zero-initialized.
10576 Expression_list* vals_;
10582 Struct_construction_expression::do_traverse(Traverse* traverse)
10584 if (this->vals_ != NULL
10585 && this->vals_->traverse(traverse) == TRAVERSE_EXIT)
10586 return TRAVERSE_EXIT;
10587 if (Type::traverse(this->type_, traverse) == TRAVERSE_EXIT)
10588 return TRAVERSE_EXIT;
10589 return TRAVERSE_CONTINUE;
10592 // Return whether this is a constant initializer.
10595 Struct_construction_expression::is_constant_struct() const
10597 if (this->vals_ == NULL)
10599 for (Expression_list::const_iterator pv = this->vals_->begin();
10600 pv != this->vals_->end();
10604 && !(*pv)->is_constant()
10605 && (!(*pv)->is_composite_literal()
10606 || (*pv)->is_nonconstant_composite_literal()))
10610 const Struct_field_list* fields = this->type_->struct_type()->fields();
10611 for (Struct_field_list::const_iterator pf = fields->begin();
10612 pf != fields->end();
10615 // There are no constant constructors for interfaces.
10616 if (pf->type()->interface_type() != NULL)
10623 // Final type determination.
10626 Struct_construction_expression::do_determine_type(const Type_context*)
10628 if (this->vals_ == NULL)
10630 const Struct_field_list* fields = this->type_->struct_type()->fields();
10631 Expression_list::const_iterator pv = this->vals_->begin();
10632 for (Struct_field_list::const_iterator pf = fields->begin();
10633 pf != fields->end();
10636 if (pv == this->vals_->end())
10640 Type_context subcontext(pf->type(), false);
10641 (*pv)->determine_type(&subcontext);
10644 // Extra values are an error we will report elsewhere; we still want
10645 // to determine the type to avoid knockon errors.
10646 for (; pv != this->vals_->end(); ++pv)
10647 (*pv)->determine_type_no_context();
10653 Struct_construction_expression::do_check_types(Gogo*)
10655 if (this->vals_ == NULL)
10658 Struct_type* st = this->type_->struct_type();
10659 if (this->vals_->size() > st->field_count())
10661 this->report_error(_("too many expressions for struct"));
10665 const Struct_field_list* fields = st->fields();
10666 Expression_list::const_iterator pv = this->vals_->begin();
10668 for (Struct_field_list::const_iterator pf = fields->begin();
10669 pf != fields->end();
10672 if (pv == this->vals_->end())
10674 this->report_error(_("too few expressions for struct"));
10681 std::string reason;
10682 if (!Type::are_assignable(pf->type(), (*pv)->type(), &reason))
10684 if (reason.empty())
10685 error_at((*pv)->location(),
10686 "incompatible type for field %d in struct construction",
10689 error_at((*pv)->location(),
10690 ("incompatible type for field %d in "
10691 "struct construction (%s)"),
10692 i + 1, reason.c_str());
10693 this->set_is_error();
10696 gcc_assert(pv == this->vals_->end());
10699 // Return a tree for constructing a struct.
10702 Struct_construction_expression::do_get_tree(Translate_context* context)
10704 Gogo* gogo = context->gogo();
10706 if (this->vals_ == NULL)
10707 return this->type_->get_init_tree(gogo, false);
10709 tree type_tree = this->type_->get_tree(gogo);
10710 if (type_tree == error_mark_node)
10711 return error_mark_node;
10712 gcc_assert(TREE_CODE(type_tree) == RECORD_TYPE);
10714 bool is_constant = true;
10715 const Struct_field_list* fields = this->type_->struct_type()->fields();
10716 VEC(constructor_elt,gc)* elts = VEC_alloc(constructor_elt, gc,
10718 Struct_field_list::const_iterator pf = fields->begin();
10719 Expression_list::const_iterator pv = this->vals_->begin();
10720 for (tree field = TYPE_FIELDS(type_tree);
10721 field != NULL_TREE;
10722 field = DECL_CHAIN(field), ++pf)
10724 gcc_assert(pf != fields->end());
10727 if (pv == this->vals_->end())
10728 val = pf->type()->get_init_tree(gogo, false);
10729 else if (*pv == NULL)
10731 val = pf->type()->get_init_tree(gogo, false);
10736 val = Expression::convert_for_assignment(context, pf->type(),
10738 (*pv)->get_tree(context),
10743 if (val == error_mark_node || TREE_TYPE(val) == error_mark_node)
10744 return error_mark_node;
10746 constructor_elt* elt = VEC_quick_push(constructor_elt, elts, NULL);
10747 elt->index = field;
10749 if (!TREE_CONSTANT(val))
10750 is_constant = false;
10752 gcc_assert(pf == fields->end());
10754 tree ret = build_constructor(type_tree, elts);
10756 TREE_CONSTANT(ret) = 1;
10760 // Export a struct construction.
10763 Struct_construction_expression::do_export(Export* exp) const
10765 exp->write_c_string("convert(");
10766 exp->write_type(this->type_);
10767 for (Expression_list::const_iterator pv = this->vals_->begin();
10768 pv != this->vals_->end();
10771 exp->write_c_string(", ");
10773 (*pv)->export_expression(exp);
10775 exp->write_c_string(")");
10778 // Make a struct composite literal. This used by the thunk code.
10781 Expression::make_struct_composite_literal(Type* type, Expression_list* vals,
10782 source_location location)
10784 gcc_assert(type->struct_type() != NULL);
10785 return new Struct_construction_expression(type, vals, location);
10788 // Construct an array. This class is not used directly; instead we
10789 // use the child classes, Fixed_array_construction_expression and
10790 // Open_array_construction_expression.
10792 class Array_construction_expression : public Expression
10795 Array_construction_expression(Expression_classification classification,
10796 Type* type, Expression_list* vals,
10797 source_location location)
10798 : Expression(classification, location),
10799 type_(type), vals_(vals)
10803 // Return whether this is a constant initializer.
10805 is_constant_array() const;
10807 // Return the number of elements.
10809 element_count() const
10810 { return this->vals_ == NULL ? 0 : this->vals_->size(); }
10814 do_traverse(Traverse* traverse);
10818 { return this->type_; }
10821 do_determine_type(const Type_context*);
10824 do_check_types(Gogo*);
10827 do_is_addressable() const
10831 do_export(Export*) const;
10833 // The list of values.
10836 { return this->vals_; }
10838 // Get a constructor tree for the array values.
10840 get_constructor_tree(Translate_context* context, tree type_tree);
10843 // The type of the array to construct.
10845 // The list of values.
10846 Expression_list* vals_;
10852 Array_construction_expression::do_traverse(Traverse* traverse)
10854 if (this->vals_ != NULL
10855 && this->vals_->traverse(traverse) == TRAVERSE_EXIT)
10856 return TRAVERSE_EXIT;
10857 if (Type::traverse(this->type_, traverse) == TRAVERSE_EXIT)
10858 return TRAVERSE_EXIT;
10859 return TRAVERSE_CONTINUE;
10862 // Return whether this is a constant initializer.
10865 Array_construction_expression::is_constant_array() const
10867 if (this->vals_ == NULL)
10870 // There are no constant constructors for interfaces.
10871 if (this->type_->array_type()->element_type()->interface_type() != NULL)
10874 for (Expression_list::const_iterator pv = this->vals_->begin();
10875 pv != this->vals_->end();
10879 && !(*pv)->is_constant()
10880 && (!(*pv)->is_composite_literal()
10881 || (*pv)->is_nonconstant_composite_literal()))
10887 // Final type determination.
10890 Array_construction_expression::do_determine_type(const Type_context*)
10892 if (this->vals_ == NULL)
10894 Type_context subcontext(this->type_->array_type()->element_type(), false);
10895 for (Expression_list::const_iterator pv = this->vals_->begin();
10896 pv != this->vals_->end();
10900 (*pv)->determine_type(&subcontext);
10907 Array_construction_expression::do_check_types(Gogo*)
10909 if (this->vals_ == NULL)
10912 Array_type* at = this->type_->array_type();
10914 Type* element_type = at->element_type();
10915 for (Expression_list::const_iterator pv = this->vals_->begin();
10916 pv != this->vals_->end();
10920 && !Type::are_assignable(element_type, (*pv)->type(), NULL))
10922 error_at((*pv)->location(),
10923 "incompatible type for element %d in composite literal",
10925 this->set_is_error();
10929 Expression* length = at->length();
10930 if (length != NULL)
10935 if (at->length()->integer_constant_value(true, val, &type))
10937 if (this->vals_->size() > mpz_get_ui(val))
10938 this->report_error(_("too many elements in composite literal"));
10944 // Get a constructor tree for the array values.
10947 Array_construction_expression::get_constructor_tree(Translate_context* context,
10950 VEC(constructor_elt,gc)* values = VEC_alloc(constructor_elt, gc,
10951 (this->vals_ == NULL
10953 : this->vals_->size()));
10954 Type* element_type = this->type_->array_type()->element_type();
10955 bool is_constant = true;
10956 if (this->vals_ != NULL)
10959 for (Expression_list::const_iterator pv = this->vals_->begin();
10960 pv != this->vals_->end();
10963 constructor_elt* elt = VEC_quick_push(constructor_elt, values, NULL);
10964 elt->index = size_int(i);
10966 elt->value = element_type->get_init_tree(context->gogo(), false);
10969 tree value_tree = (*pv)->get_tree(context);
10970 elt->value = Expression::convert_for_assignment(context,
10976 if (elt->value == error_mark_node)
10977 return error_mark_node;
10978 if (!TREE_CONSTANT(elt->value))
10979 is_constant = false;
10983 tree ret = build_constructor(type_tree, values);
10985 TREE_CONSTANT(ret) = 1;
10989 // Export an array construction.
10992 Array_construction_expression::do_export(Export* exp) const
10994 exp->write_c_string("convert(");
10995 exp->write_type(this->type_);
10996 if (this->vals_ != NULL)
10998 for (Expression_list::const_iterator pv = this->vals_->begin();
10999 pv != this->vals_->end();
11002 exp->write_c_string(", ");
11004 (*pv)->export_expression(exp);
11007 exp->write_c_string(")");
11010 // Construct a fixed array.
11012 class Fixed_array_construction_expression :
11013 public Array_construction_expression
11016 Fixed_array_construction_expression(Type* type, Expression_list* vals,
11017 source_location location)
11018 : Array_construction_expression(EXPRESSION_FIXED_ARRAY_CONSTRUCTION,
11019 type, vals, location)
11021 gcc_assert(type->array_type() != NULL
11022 && type->array_type()->length() != NULL);
11029 return new Fixed_array_construction_expression(this->type(),
11030 (this->vals() == NULL
11032 : this->vals()->copy()),
11037 do_get_tree(Translate_context*);
11040 // Return a tree for constructing a fixed array.
11043 Fixed_array_construction_expression::do_get_tree(Translate_context* context)
11045 return this->get_constructor_tree(context,
11046 this->type()->get_tree(context->gogo()));
11049 // Construct an open array.
11051 class Open_array_construction_expression : public Array_construction_expression
11054 Open_array_construction_expression(Type* type, Expression_list* vals,
11055 source_location location)
11056 : Array_construction_expression(EXPRESSION_OPEN_ARRAY_CONSTRUCTION,
11057 type, vals, location)
11059 gcc_assert(type->array_type() != NULL
11060 && type->array_type()->length() == NULL);
11064 // Note that taking the address of an open array literal is invalid.
11069 return new Open_array_construction_expression(this->type(),
11070 (this->vals() == NULL
11072 : this->vals()->copy()),
11077 do_get_tree(Translate_context*);
11080 // Return a tree for constructing an open array.
11083 Open_array_construction_expression::do_get_tree(Translate_context* context)
11085 Array_type* array_type = this->type()->array_type();
11086 if (array_type == NULL)
11088 gcc_assert(this->type()->is_error_type());
11089 return error_mark_node;
11092 Type* element_type = array_type->element_type();
11093 tree element_type_tree = element_type->get_tree(context->gogo());
11094 if (element_type_tree == error_mark_node)
11095 return error_mark_node;
11099 if (this->vals() == NULL || this->vals()->empty())
11101 // We need to create a unique value.
11102 tree max = size_int(0);
11103 tree constructor_type = build_array_type(element_type_tree,
11104 build_index_type(max));
11105 if (constructor_type == error_mark_node)
11106 return error_mark_node;
11107 VEC(constructor_elt,gc)* vec = VEC_alloc(constructor_elt, gc, 1);
11108 constructor_elt* elt = VEC_quick_push(constructor_elt, vec, NULL);
11109 elt->index = size_int(0);
11110 elt->value = element_type->get_init_tree(context->gogo(), false);
11111 values = build_constructor(constructor_type, vec);
11112 if (TREE_CONSTANT(elt->value))
11113 TREE_CONSTANT(values) = 1;
11114 length_tree = size_int(0);
11118 tree max = size_int(this->vals()->size() - 1);
11119 tree constructor_type = build_array_type(element_type_tree,
11120 build_index_type(max));
11121 if (constructor_type == error_mark_node)
11122 return error_mark_node;
11123 values = this->get_constructor_tree(context, constructor_type);
11124 length_tree = size_int(this->vals()->size());
11127 if (values == error_mark_node)
11128 return error_mark_node;
11130 bool is_constant_initializer = TREE_CONSTANT(values);
11132 // We have to copy the initial values into heap memory if we are in
11133 // a function or if the values are not constants. We also have to
11134 // copy them if they may contain pointers in a non-constant context,
11135 // as otherwise the garbage collector won't see them.
11136 bool copy_to_heap = (context->function() != NULL
11137 || !is_constant_initializer
11138 || (element_type->has_pointer()
11139 && !context->is_const()));
11141 if (is_constant_initializer)
11143 tree tmp = build_decl(this->location(), VAR_DECL,
11144 create_tmp_var_name("C"), TREE_TYPE(values));
11145 DECL_EXTERNAL(tmp) = 0;
11146 TREE_PUBLIC(tmp) = 0;
11147 TREE_STATIC(tmp) = 1;
11148 DECL_ARTIFICIAL(tmp) = 1;
11151 // If we are not copying the value to the heap, we will only
11152 // initialize the value once, so we can use this directly
11153 // rather than copying it. In that case we can't make it
11154 // read-only, because the program is permitted to change it.
11155 TREE_READONLY(tmp) = 1;
11156 TREE_CONSTANT(tmp) = 1;
11158 DECL_INITIAL(tmp) = values;
11159 rest_of_decl_compilation(tmp, 1, 0);
11167 // the initializer will only run once.
11168 space = build_fold_addr_expr(values);
11173 tree memsize = TYPE_SIZE_UNIT(TREE_TYPE(values));
11174 space = context->gogo()->allocate_memory(element_type, memsize,
11176 space = save_expr(space);
11178 tree s = fold_convert(build_pointer_type(TREE_TYPE(values)), space);
11179 tree ref = build_fold_indirect_ref_loc(this->location(), s);
11180 TREE_THIS_NOTRAP(ref) = 1;
11181 set = build2(MODIFY_EXPR, void_type_node, ref, values);
11184 // Build a constructor for the open array.
11186 tree type_tree = this->type()->get_tree(context->gogo());
11187 if (type_tree == error_mark_node)
11188 return error_mark_node;
11189 gcc_assert(TREE_CODE(type_tree) == RECORD_TYPE);
11191 VEC(constructor_elt,gc)* init = VEC_alloc(constructor_elt, gc, 3);
11193 constructor_elt* elt = VEC_quick_push(constructor_elt, init, NULL);
11194 tree field = TYPE_FIELDS(type_tree);
11195 gcc_assert(strcmp(IDENTIFIER_POINTER(DECL_NAME(field)), "__values") == 0);
11196 elt->index = field;
11197 elt->value = fold_convert(TREE_TYPE(field), space);
11199 elt = VEC_quick_push(constructor_elt, init, NULL);
11200 field = DECL_CHAIN(field);
11201 gcc_assert(strcmp(IDENTIFIER_POINTER(DECL_NAME(field)), "__count") == 0);
11202 elt->index = field;
11203 elt->value = fold_convert(TREE_TYPE(field), length_tree);
11205 elt = VEC_quick_push(constructor_elt, init, NULL);
11206 field = DECL_CHAIN(field);
11207 gcc_assert(strcmp(IDENTIFIER_POINTER(DECL_NAME(field)),"__capacity") == 0);
11208 elt->index = field;
11209 elt->value = fold_convert(TREE_TYPE(field), length_tree);
11211 tree constructor = build_constructor(type_tree, init);
11212 if (constructor == error_mark_node)
11213 return error_mark_node;
11215 TREE_CONSTANT(constructor) = 1;
11217 if (set == NULL_TREE)
11218 return constructor;
11220 return build2(COMPOUND_EXPR, type_tree, set, constructor);
11223 // Make a slice composite literal. This is used by the type
11224 // descriptor code.
11227 Expression::make_slice_composite_literal(Type* type, Expression_list* vals,
11228 source_location location)
11230 gcc_assert(type->is_open_array_type());
11231 return new Open_array_construction_expression(type, vals, location);
11234 // Construct a map.
11236 class Map_construction_expression : public Expression
11239 Map_construction_expression(Type* type, Expression_list* vals,
11240 source_location location)
11241 : Expression(EXPRESSION_MAP_CONSTRUCTION, location),
11242 type_(type), vals_(vals)
11243 { gcc_assert(vals == NULL || vals->size() % 2 == 0); }
11247 do_traverse(Traverse* traverse);
11251 { return this->type_; }
11254 do_determine_type(const Type_context*);
11257 do_check_types(Gogo*);
11262 return new Map_construction_expression(this->type_, this->vals_->copy(),
11267 do_get_tree(Translate_context*);
11270 do_export(Export*) const;
11273 // The type of the map to construct.
11275 // The list of values.
11276 Expression_list* vals_;
11282 Map_construction_expression::do_traverse(Traverse* traverse)
11284 if (this->vals_ != NULL
11285 && this->vals_->traverse(traverse) == TRAVERSE_EXIT)
11286 return TRAVERSE_EXIT;
11287 if (Type::traverse(this->type_, traverse) == TRAVERSE_EXIT)
11288 return TRAVERSE_EXIT;
11289 return TRAVERSE_CONTINUE;
11292 // Final type determination.
11295 Map_construction_expression::do_determine_type(const Type_context*)
11297 if (this->vals_ == NULL)
11300 Map_type* mt = this->type_->map_type();
11301 Type_context key_context(mt->key_type(), false);
11302 Type_context val_context(mt->val_type(), false);
11303 for (Expression_list::const_iterator pv = this->vals_->begin();
11304 pv != this->vals_->end();
11307 (*pv)->determine_type(&key_context);
11309 (*pv)->determine_type(&val_context);
11316 Map_construction_expression::do_check_types(Gogo*)
11318 if (this->vals_ == NULL)
11321 Map_type* mt = this->type_->map_type();
11323 Type* key_type = mt->key_type();
11324 Type* val_type = mt->val_type();
11325 for (Expression_list::const_iterator pv = this->vals_->begin();
11326 pv != this->vals_->end();
11329 if (!Type::are_assignable(key_type, (*pv)->type(), NULL))
11331 error_at((*pv)->location(),
11332 "incompatible type for element %d key in map construction",
11334 this->set_is_error();
11337 if (!Type::are_assignable(val_type, (*pv)->type(), NULL))
11339 error_at((*pv)->location(),
11340 ("incompatible type for element %d value "
11341 "in map construction"),
11343 this->set_is_error();
11348 // Return a tree for constructing a map.
11351 Map_construction_expression::do_get_tree(Translate_context* context)
11353 Gogo* gogo = context->gogo();
11354 source_location loc = this->location();
11356 Map_type* mt = this->type_->map_type();
11358 // Build a struct to hold the key and value.
11359 tree struct_type = make_node(RECORD_TYPE);
11361 Type* key_type = mt->key_type();
11362 tree id = get_identifier("__key");
11363 tree key_type_tree = key_type->get_tree(gogo);
11364 if (key_type_tree == error_mark_node)
11365 return error_mark_node;
11366 tree key_field = build_decl(loc, FIELD_DECL, id, key_type_tree);
11367 DECL_CONTEXT(key_field) = struct_type;
11368 TYPE_FIELDS(struct_type) = key_field;
11370 Type* val_type = mt->val_type();
11371 id = get_identifier("__val");
11372 tree val_type_tree = val_type->get_tree(gogo);
11373 if (val_type_tree == error_mark_node)
11374 return error_mark_node;
11375 tree val_field = build_decl(loc, FIELD_DECL, id, val_type_tree);
11376 DECL_CONTEXT(val_field) = struct_type;
11377 DECL_CHAIN(key_field) = val_field;
11379 layout_type(struct_type);
11381 bool is_constant = true;
11386 if (this->vals_ == NULL || this->vals_->empty())
11388 valaddr = null_pointer_node;
11389 make_tmp = NULL_TREE;
11393 VEC(constructor_elt,gc)* values = VEC_alloc(constructor_elt, gc,
11394 this->vals_->size() / 2);
11396 for (Expression_list::const_iterator pv = this->vals_->begin();
11397 pv != this->vals_->end();
11400 bool one_is_constant = true;
11402 VEC(constructor_elt,gc)* one = VEC_alloc(constructor_elt, gc, 2);
11404 constructor_elt* elt = VEC_quick_push(constructor_elt, one, NULL);
11405 elt->index = key_field;
11406 tree val_tree = (*pv)->get_tree(context);
11407 elt->value = Expression::convert_for_assignment(context, key_type,
11410 if (elt->value == error_mark_node)
11411 return error_mark_node;
11412 if (!TREE_CONSTANT(elt->value))
11413 one_is_constant = false;
11417 elt = VEC_quick_push(constructor_elt, one, NULL);
11418 elt->index = val_field;
11419 val_tree = (*pv)->get_tree(context);
11420 elt->value = Expression::convert_for_assignment(context, val_type,
11423 if (elt->value == error_mark_node)
11424 return error_mark_node;
11425 if (!TREE_CONSTANT(elt->value))
11426 one_is_constant = false;
11428 elt = VEC_quick_push(constructor_elt, values, NULL);
11429 elt->index = size_int(i);
11430 elt->value = build_constructor(struct_type, one);
11431 if (one_is_constant)
11432 TREE_CONSTANT(elt->value) = 1;
11434 is_constant = false;
11437 tree index_type = build_index_type(size_int(i - 1));
11438 tree array_type = build_array_type(struct_type, index_type);
11439 tree init = build_constructor(array_type, values);
11441 TREE_CONSTANT(init) = 1;
11443 if (current_function_decl != NULL)
11445 tmp = create_tmp_var(array_type, get_name(array_type));
11446 DECL_INITIAL(tmp) = init;
11447 make_tmp = fold_build1_loc(loc, DECL_EXPR, void_type_node, tmp);
11448 TREE_ADDRESSABLE(tmp) = 1;
11452 tmp = build_decl(loc, VAR_DECL, create_tmp_var_name("M"), array_type);
11453 DECL_EXTERNAL(tmp) = 0;
11454 TREE_PUBLIC(tmp) = 0;
11455 TREE_STATIC(tmp) = 1;
11456 DECL_ARTIFICIAL(tmp) = 1;
11457 if (!TREE_CONSTANT(init))
11458 make_tmp = fold_build2_loc(loc, INIT_EXPR, void_type_node, tmp,
11462 TREE_READONLY(tmp) = 1;
11463 TREE_CONSTANT(tmp) = 1;
11464 DECL_INITIAL(tmp) = init;
11465 make_tmp = NULL_TREE;
11467 rest_of_decl_compilation(tmp, 1, 0);
11470 valaddr = build_fold_addr_expr(tmp);
11473 tree descriptor = gogo->map_descriptor(mt);
11475 tree type_tree = this->type_->get_tree(gogo);
11476 if (type_tree == error_mark_node)
11477 return error_mark_node;
11479 static tree construct_map_fndecl;
11480 tree call = Gogo::call_builtin(&construct_map_fndecl,
11482 "__go_construct_map",
11485 TREE_TYPE(descriptor),
11490 TYPE_SIZE_UNIT(struct_type),
11492 byte_position(val_field),
11494 TYPE_SIZE_UNIT(TREE_TYPE(val_field)),
11495 const_ptr_type_node,
11496 fold_convert(const_ptr_type_node, valaddr));
11497 if (call == error_mark_node)
11498 return error_mark_node;
11501 if (make_tmp == NULL)
11504 ret = fold_build2_loc(loc, COMPOUND_EXPR, type_tree, make_tmp, call);
11508 // Export an array construction.
11511 Map_construction_expression::do_export(Export* exp) const
11513 exp->write_c_string("convert(");
11514 exp->write_type(this->type_);
11515 for (Expression_list::const_iterator pv = this->vals_->begin();
11516 pv != this->vals_->end();
11519 exp->write_c_string(", ");
11520 (*pv)->export_expression(exp);
11522 exp->write_c_string(")");
11525 // A general composite literal. This is lowered to a type specific
11528 class Composite_literal_expression : public Parser_expression
11531 Composite_literal_expression(Type* type, int depth, bool has_keys,
11532 Expression_list* vals, source_location location)
11533 : Parser_expression(EXPRESSION_COMPOSITE_LITERAL, location),
11534 type_(type), depth_(depth), vals_(vals), has_keys_(has_keys)
11539 do_traverse(Traverse* traverse);
11542 do_lower(Gogo*, Named_object*, int);
11547 return new Composite_literal_expression(this->type_, this->depth_,
11549 (this->vals_ == NULL
11551 : this->vals_->copy()),
11557 lower_struct(Type*);
11560 lower_array(Type*);
11563 make_array(Type*, Expression_list*);
11566 lower_map(Gogo*, Named_object*, Type*);
11568 // The type of the composite literal.
11570 // The depth within a list of composite literals within a composite
11571 // literal, when the type is omitted.
11573 // The values to put in the composite literal.
11574 Expression_list* vals_;
11575 // If this is true, then VALS_ is a list of pairs: a key and a
11576 // value. In an array initializer, a missing key will be NULL.
11583 Composite_literal_expression::do_traverse(Traverse* traverse)
11585 if (this->vals_ != NULL
11586 && this->vals_->traverse(traverse) == TRAVERSE_EXIT)
11587 return TRAVERSE_EXIT;
11588 return Type::traverse(this->type_, traverse);
11591 // Lower a generic composite literal into a specific version based on
11595 Composite_literal_expression::do_lower(Gogo* gogo, Named_object* function, int)
11597 Type* type = this->type_;
11599 for (int depth = this->depth_; depth > 0; --depth)
11601 if (type->array_type() != NULL)
11602 type = type->array_type()->element_type();
11603 else if (type->map_type() != NULL)
11604 type = type->map_type()->val_type();
11607 if (!type->is_error_type())
11608 error_at(this->location(),
11609 ("may only omit types within composite literals "
11610 "of slice, array, or map type"));
11611 return Expression::make_error(this->location());
11615 if (type->is_error_type())
11616 return Expression::make_error(this->location());
11617 else if (type->struct_type() != NULL)
11618 return this->lower_struct(type);
11619 else if (type->array_type() != NULL)
11620 return this->lower_array(type);
11621 else if (type->map_type() != NULL)
11622 return this->lower_map(gogo, function, type);
11625 error_at(this->location(),
11626 ("expected struct, slice, array, or map type "
11627 "for composite literal"));
11628 return Expression::make_error(this->location());
11632 // Lower a struct composite literal.
11635 Composite_literal_expression::lower_struct(Type* type)
11637 source_location location = this->location();
11638 Struct_type* st = type->struct_type();
11639 if (this->vals_ == NULL || !this->has_keys_)
11640 return new Struct_construction_expression(type, this->vals_, location);
11642 size_t field_count = st->field_count();
11643 std::vector<Expression*> vals(field_count);
11644 Expression_list::const_iterator p = this->vals_->begin();
11645 while (p != this->vals_->end())
11647 Expression* name_expr = *p;
11650 gcc_assert(p != this->vals_->end());
11651 Expression* val = *p;
11655 if (name_expr == NULL)
11657 error_at(val->location(), "mixture of field and value initializers");
11658 return Expression::make_error(location);
11661 bool bad_key = false;
11663 switch (name_expr->classification())
11665 case EXPRESSION_UNKNOWN_REFERENCE:
11666 name = name_expr->unknown_expression()->name();
11669 case EXPRESSION_CONST_REFERENCE:
11670 name = static_cast<Const_expression*>(name_expr)->name();
11673 case EXPRESSION_TYPE:
11675 Type* t = name_expr->type();
11676 Named_type* nt = t->named_type();
11684 case EXPRESSION_VAR_REFERENCE:
11685 name = name_expr->var_expression()->name();
11688 case EXPRESSION_FUNC_REFERENCE:
11689 name = name_expr->func_expression()->name();
11692 case EXPRESSION_UNARY:
11693 // If there is a local variable around with the same name as
11694 // the field, and this occurs in the closure, then the
11695 // parser may turn the field reference into an indirection
11696 // through the closure. FIXME: This is a mess.
11699 Unary_expression* ue = static_cast<Unary_expression*>(name_expr);
11700 if (ue->op() == OPERATOR_MULT)
11702 Field_reference_expression* fre =
11703 ue->operand()->field_reference_expression();
11707 fre->expr()->type()->deref()->struct_type();
11710 const Struct_field* sf = st->field(fre->field_index());
11711 name = sf->field_name();
11713 snprintf(buf, sizeof buf, "%u", fre->field_index());
11714 size_t buflen = strlen(buf);
11715 if (name.compare(name.length() - buflen, buflen, buf)
11718 name = name.substr(0, name.length() - buflen);
11733 error_at(name_expr->location(), "expected struct field name");
11734 return Expression::make_error(location);
11737 unsigned int index;
11738 const Struct_field* sf = st->find_local_field(name, &index);
11741 error_at(name_expr->location(), "unknown field %qs in %qs",
11742 Gogo::message_name(name).c_str(),
11743 (type->named_type() != NULL
11744 ? type->named_type()->message_name().c_str()
11745 : "unnamed struct"));
11746 return Expression::make_error(location);
11748 if (vals[index] != NULL)
11750 error_at(name_expr->location(),
11751 "duplicate value for field %qs in %qs",
11752 Gogo::message_name(name).c_str(),
11753 (type->named_type() != NULL
11754 ? type->named_type()->message_name().c_str()
11755 : "unnamed struct"));
11756 return Expression::make_error(location);
11762 Expression_list* list = new Expression_list;
11763 list->reserve(field_count);
11764 for (size_t i = 0; i < field_count; ++i)
11765 list->push_back(vals[i]);
11767 return new Struct_construction_expression(type, list, location);
11770 // Lower an array composite literal.
11773 Composite_literal_expression::lower_array(Type* type)
11775 source_location location = this->location();
11776 if (this->vals_ == NULL || !this->has_keys_)
11777 return this->make_array(type, this->vals_);
11779 std::vector<Expression*> vals;
11780 vals.reserve(this->vals_->size());
11781 unsigned long index = 0;
11782 Expression_list::const_iterator p = this->vals_->begin();
11783 while (p != this->vals_->end())
11785 Expression* index_expr = *p;
11788 gcc_assert(p != this->vals_->end());
11789 Expression* val = *p;
11793 if (index_expr != NULL)
11798 if (!index_expr->integer_constant_value(true, ival, &dummy))
11801 error_at(index_expr->location(),
11802 "index expression is not integer constant");
11803 return Expression::make_error(location);
11805 if (mpz_sgn(ival) < 0)
11808 error_at(index_expr->location(), "index expression is negative");
11809 return Expression::make_error(location);
11811 index = mpz_get_ui(ival);
11812 if (mpz_cmp_ui(ival, index) != 0)
11815 error_at(index_expr->location(), "index value overflow");
11816 return Expression::make_error(location);
11821 if (index == vals.size())
11822 vals.push_back(val);
11825 if (index > vals.size())
11827 vals.reserve(index + 32);
11828 vals.resize(index + 1, static_cast<Expression*>(NULL));
11830 if (vals[index] != NULL)
11832 error_at((index_expr != NULL
11833 ? index_expr->location()
11834 : val->location()),
11835 "duplicate value for index %lu",
11837 return Expression::make_error(location);
11845 size_t size = vals.size();
11846 Expression_list* list = new Expression_list;
11847 list->reserve(size);
11848 for (size_t i = 0; i < size; ++i)
11849 list->push_back(vals[i]);
11851 return this->make_array(type, list);
11854 // Actually build the array composite literal. This handles
11858 Composite_literal_expression::make_array(Type* type, Expression_list* vals)
11860 source_location location = this->location();
11861 Array_type* at = type->array_type();
11862 if (at->length() != NULL && at->length()->is_nil_expression())
11864 size_t size = vals == NULL ? 0 : vals->size();
11866 mpz_init_set_ui(vlen, size);
11867 Expression* elen = Expression::make_integer(&vlen, NULL, location);
11869 at = Type::make_array_type(at->element_type(), elen);
11872 if (at->length() != NULL)
11873 return new Fixed_array_construction_expression(type, vals, location);
11875 return new Open_array_construction_expression(type, vals, location);
11878 // Lower a map composite literal.
11881 Composite_literal_expression::lower_map(Gogo* gogo, Named_object* function,
11884 source_location location = this->location();
11885 if (this->vals_ != NULL)
11887 if (!this->has_keys_)
11889 error_at(location, "map composite literal must have keys");
11890 return Expression::make_error(location);
11893 for (Expression_list::iterator p = this->vals_->begin();
11894 p != this->vals_->end();
11900 error_at((*p)->location(),
11901 "map composite literal must have keys for every value");
11902 return Expression::make_error(location);
11904 // Make sure we have lowered the key; it may not have been
11905 // lowered in order to handle keys for struct composite
11906 // literals. Lower it now to get the right error message.
11907 if ((*p)->unknown_expression() != NULL)
11909 (*p)->unknown_expression()->clear_is_composite_literal_key();
11910 gogo->lower_expression(function, &*p);
11911 gcc_assert((*p)->is_error_expression());
11912 return Expression::make_error(location);
11917 return new Map_construction_expression(type, this->vals_, location);
11920 // Make a composite literal expression.
11923 Expression::make_composite_literal(Type* type, int depth, bool has_keys,
11924 Expression_list* vals,
11925 source_location location)
11927 return new Composite_literal_expression(type, depth, has_keys, vals,
11931 // Return whether this expression is a composite literal.
11934 Expression::is_composite_literal() const
11936 switch (this->classification_)
11938 case EXPRESSION_COMPOSITE_LITERAL:
11939 case EXPRESSION_STRUCT_CONSTRUCTION:
11940 case EXPRESSION_FIXED_ARRAY_CONSTRUCTION:
11941 case EXPRESSION_OPEN_ARRAY_CONSTRUCTION:
11942 case EXPRESSION_MAP_CONSTRUCTION:
11949 // Return whether this expression is a composite literal which is not
11953 Expression::is_nonconstant_composite_literal() const
11955 switch (this->classification_)
11957 case EXPRESSION_STRUCT_CONSTRUCTION:
11959 const Struct_construction_expression *psce =
11960 static_cast<const Struct_construction_expression*>(this);
11961 return !psce->is_constant_struct();
11963 case EXPRESSION_FIXED_ARRAY_CONSTRUCTION:
11965 const Fixed_array_construction_expression *pace =
11966 static_cast<const Fixed_array_construction_expression*>(this);
11967 return !pace->is_constant_array();
11969 case EXPRESSION_OPEN_ARRAY_CONSTRUCTION:
11971 const Open_array_construction_expression *pace =
11972 static_cast<const Open_array_construction_expression*>(this);
11973 return !pace->is_constant_array();
11975 case EXPRESSION_MAP_CONSTRUCTION:
11982 // Return true if this is a reference to a local variable.
11985 Expression::is_local_variable() const
11987 const Var_expression* ve = this->var_expression();
11990 const Named_object* no = ve->named_object();
11991 return (no->is_result_variable()
11992 || (no->is_variable() && !no->var_value()->is_global()));
11995 // Class Type_guard_expression.
12000 Type_guard_expression::do_traverse(Traverse* traverse)
12002 if (Expression::traverse(&this->expr_, traverse) == TRAVERSE_EXIT
12003 || Type::traverse(this->type_, traverse) == TRAVERSE_EXIT)
12004 return TRAVERSE_EXIT;
12005 return TRAVERSE_CONTINUE;
12008 // Check types of a type guard expression. The expression must have
12009 // an interface type, but the actual type conversion is checked at run
12013 Type_guard_expression::do_check_types(Gogo*)
12015 // 6g permits using a type guard with unsafe.pointer; we are
12017 Type* expr_type = this->expr_->type();
12018 if (expr_type->is_unsafe_pointer_type())
12020 if (this->type_->points_to() == NULL
12021 && (this->type_->integer_type() == NULL
12022 || (this->type_->forwarded()
12023 != Type::lookup_integer_type("uintptr"))))
12024 this->report_error(_("invalid unsafe.Pointer conversion"));
12026 else if (this->type_->is_unsafe_pointer_type())
12028 if (expr_type->points_to() == NULL
12029 && (expr_type->integer_type() == NULL
12030 || (expr_type->forwarded()
12031 != Type::lookup_integer_type("uintptr"))))
12032 this->report_error(_("invalid unsafe.Pointer conversion"));
12034 else if (expr_type->interface_type() == NULL)
12036 if (!expr_type->is_error_type() && !this->type_->is_error_type())
12037 this->report_error(_("type assertion only valid for interface types"));
12038 this->set_is_error();
12040 else if (this->type_->interface_type() == NULL)
12042 std::string reason;
12043 if (!expr_type->interface_type()->implements_interface(this->type_,
12046 if (!this->type_->is_error_type())
12048 if (reason.empty())
12049 this->report_error(_("impossible type assertion: "
12050 "type does not implement interface"));
12052 error_at(this->location(),
12053 ("impossible type assertion: "
12054 "type does not implement interface (%s)"),
12057 this->set_is_error();
12062 // Return a tree for a type guard expression.
12065 Type_guard_expression::do_get_tree(Translate_context* context)
12067 Gogo* gogo = context->gogo();
12068 tree expr_tree = this->expr_->get_tree(context);
12069 if (expr_tree == error_mark_node)
12070 return error_mark_node;
12071 Type* expr_type = this->expr_->type();
12072 if ((this->type_->is_unsafe_pointer_type()
12073 && (expr_type->points_to() != NULL
12074 || expr_type->integer_type() != NULL))
12075 || (expr_type->is_unsafe_pointer_type()
12076 && this->type_->points_to() != NULL))
12077 return convert_to_pointer(this->type_->get_tree(gogo), expr_tree);
12078 else if (expr_type->is_unsafe_pointer_type()
12079 && this->type_->integer_type() != NULL)
12080 return convert_to_integer(this->type_->get_tree(gogo), expr_tree);
12081 else if (this->type_->interface_type() != NULL)
12082 return Expression::convert_interface_to_interface(context, this->type_,
12083 this->expr_->type(),
12087 return Expression::convert_for_assignment(context, this->type_,
12088 this->expr_->type(), expr_tree,
12092 // Make a type guard expression.
12095 Expression::make_type_guard(Expression* expr, Type* type,
12096 source_location location)
12098 return new Type_guard_expression(expr, type, location);
12101 // Class Heap_composite_expression.
12103 // When you take the address of a composite literal, it is allocated
12104 // on the heap. This class implements that.
12106 class Heap_composite_expression : public Expression
12109 Heap_composite_expression(Expression* expr, source_location location)
12110 : Expression(EXPRESSION_HEAP_COMPOSITE, location),
12116 do_traverse(Traverse* traverse)
12117 { return Expression::traverse(&this->expr_, traverse); }
12121 { return Type::make_pointer_type(this->expr_->type()); }
12124 do_determine_type(const Type_context*)
12125 { this->expr_->determine_type_no_context(); }
12130 return Expression::make_heap_composite(this->expr_->copy(),
12135 do_get_tree(Translate_context*);
12137 // We only export global objects, and the parser does not generate
12138 // this in global scope.
12140 do_export(Export*) const
12141 { gcc_unreachable(); }
12144 // The composite literal which is being put on the heap.
12148 // Return a tree which allocates a composite literal on the heap.
12151 Heap_composite_expression::do_get_tree(Translate_context* context)
12153 tree expr_tree = this->expr_->get_tree(context);
12154 if (expr_tree == error_mark_node)
12155 return error_mark_node;
12156 tree expr_size = TYPE_SIZE_UNIT(TREE_TYPE(expr_tree));
12157 gcc_assert(TREE_CODE(expr_size) == INTEGER_CST);
12158 tree space = context->gogo()->allocate_memory(this->expr_->type(),
12159 expr_size, this->location());
12160 space = fold_convert(build_pointer_type(TREE_TYPE(expr_tree)), space);
12161 space = save_expr(space);
12162 tree ref = build_fold_indirect_ref_loc(this->location(), space);
12163 TREE_THIS_NOTRAP(ref) = 1;
12164 tree ret = build2(COMPOUND_EXPR, TREE_TYPE(space),
12165 build2(MODIFY_EXPR, void_type_node, ref, expr_tree),
12167 SET_EXPR_LOCATION(ret, this->location());
12171 // Allocate a composite literal on the heap.
12174 Expression::make_heap_composite(Expression* expr, source_location location)
12176 return new Heap_composite_expression(expr, location);
12179 // Class Receive_expression.
12181 // Return the type of a receive expression.
12184 Receive_expression::do_type()
12186 Channel_type* channel_type = this->channel_->type()->channel_type();
12187 if (channel_type == NULL)
12188 return Type::make_error_type();
12189 return channel_type->element_type();
12192 // Check types for a receive expression.
12195 Receive_expression::do_check_types(Gogo*)
12197 Type* type = this->channel_->type();
12198 if (type->is_error_type())
12200 this->set_is_error();
12203 if (type->channel_type() == NULL)
12205 this->report_error(_("expected channel"));
12208 if (!type->channel_type()->may_receive())
12210 this->report_error(_("invalid receive on send-only channel"));
12215 // Get a tree for a receive expression.
12218 Receive_expression::do_get_tree(Translate_context* context)
12220 Channel_type* channel_type = this->channel_->type()->channel_type();
12221 gcc_assert(channel_type != NULL);
12222 Type* element_type = channel_type->element_type();
12223 tree element_type_tree = element_type->get_tree(context->gogo());
12225 tree channel = this->channel_->get_tree(context);
12226 if (element_type_tree == error_mark_node || channel == error_mark_node)
12227 return error_mark_node;
12229 return Gogo::receive_from_channel(element_type_tree, channel,
12230 this->for_select_, this->location());
12233 // Make a receive expression.
12235 Receive_expression*
12236 Expression::make_receive(Expression* channel, source_location location)
12238 return new Receive_expression(channel, location);
12241 // Class Send_expression.
12246 Send_expression::do_traverse(Traverse* traverse)
12248 if (Expression::traverse(&this->channel_, traverse) == TRAVERSE_EXIT)
12249 return TRAVERSE_EXIT;
12250 return Expression::traverse(&this->val_, traverse);
12256 Send_expression::do_type()
12258 return Type::lookup_bool_type();
12264 Send_expression::do_determine_type(const Type_context*)
12266 this->channel_->determine_type_no_context();
12268 Type* type = this->channel_->type();
12269 Type_context subcontext;
12270 if (type->channel_type() != NULL)
12271 subcontext.type = type->channel_type()->element_type();
12272 this->val_->determine_type(&subcontext);
12278 Send_expression::do_check_types(Gogo*)
12280 Type* type = this->channel_->type();
12281 if (type->is_error_type())
12283 this->set_is_error();
12286 Channel_type* channel_type = type->channel_type();
12287 if (channel_type == NULL)
12289 error_at(this->location(), "left operand of %<<-%> must be channel");
12290 this->set_is_error();
12293 Type* element_type = channel_type->element_type();
12294 if (element_type != NULL
12295 && !Type::are_assignable(element_type, this->val_->type(), NULL))
12297 this->report_error(_("incompatible types in send"));
12300 if (!channel_type->may_send())
12302 this->report_error(_("invalid send on receive-only channel"));
12307 // Get a tree for a send expression.
12310 Send_expression::do_get_tree(Translate_context* context)
12312 tree channel = this->channel_->get_tree(context);
12313 tree val = this->val_->get_tree(context);
12314 if (channel == error_mark_node || val == error_mark_node)
12315 return error_mark_node;
12316 Channel_type* channel_type = this->channel_->type()->channel_type();
12317 val = Expression::convert_for_assignment(context,
12318 channel_type->element_type(),
12319 this->val_->type(),
12322 return Gogo::send_on_channel(channel, val, this->is_value_discarded_,
12323 this->for_select_, this->location());
12326 // Make a send expression
12329 Expression::make_send(Expression* channel, Expression* val,
12330 source_location location)
12332 return new Send_expression(channel, val, location);
12335 // An expression which evaluates to a pointer to the type descriptor
12338 class Type_descriptor_expression : public Expression
12341 Type_descriptor_expression(Type* type, source_location location)
12342 : Expression(EXPRESSION_TYPE_DESCRIPTOR, location),
12349 { return Type::make_type_descriptor_ptr_type(); }
12352 do_determine_type(const Type_context*)
12360 do_get_tree(Translate_context* context)
12361 { return this->type_->type_descriptor_pointer(context->gogo()); }
12364 // The type for which this is the descriptor.
12368 // Make a type descriptor expression.
12371 Expression::make_type_descriptor(Type* type, source_location location)
12373 return new Type_descriptor_expression(type, location);
12376 // An expression which evaluates to some characteristic of a type.
12377 // This is only used to initialize fields of a type descriptor. Using
12378 // a new expression class is slightly inefficient but gives us a good
12379 // separation between the frontend and the middle-end with regard to
12380 // how types are laid out.
12382 class Type_info_expression : public Expression
12385 Type_info_expression(Type* type, Type_info type_info)
12386 : Expression(EXPRESSION_TYPE_INFO, BUILTINS_LOCATION),
12387 type_(type), type_info_(type_info)
12395 do_determine_type(const Type_context*)
12403 do_get_tree(Translate_context* context);
12406 // The type for which we are getting information.
12408 // What information we want.
12409 Type_info type_info_;
12412 // The type is chosen to match what the type descriptor struct
12416 Type_info_expression::do_type()
12418 switch (this->type_info_)
12420 case TYPE_INFO_SIZE:
12421 return Type::lookup_integer_type("uintptr");
12422 case TYPE_INFO_ALIGNMENT:
12423 case TYPE_INFO_FIELD_ALIGNMENT:
12424 return Type::lookup_integer_type("uint8");
12430 // Return type information in GENERIC.
12433 Type_info_expression::do_get_tree(Translate_context* context)
12435 tree type_tree = this->type_->get_tree(context->gogo());
12436 if (type_tree == error_mark_node)
12437 return error_mark_node;
12439 tree val_type_tree = this->type()->get_tree(context->gogo());
12440 gcc_assert(val_type_tree != error_mark_node);
12442 if (this->type_info_ == TYPE_INFO_SIZE)
12443 return fold_convert_loc(BUILTINS_LOCATION, val_type_tree,
12444 TYPE_SIZE_UNIT(type_tree));
12448 if (this->type_info_ == TYPE_INFO_ALIGNMENT)
12449 val = go_type_alignment(type_tree);
12451 val = go_field_alignment(type_tree);
12452 return build_int_cstu(val_type_tree, val);
12456 // Make a type info expression.
12459 Expression::make_type_info(Type* type, Type_info type_info)
12461 return new Type_info_expression(type, type_info);
12464 // An expression which evaluates to the offset of a field within a
12465 // struct. This, like Type_info_expression, q.v., is only used to
12466 // initialize fields of a type descriptor.
12468 class Struct_field_offset_expression : public Expression
12471 Struct_field_offset_expression(Struct_type* type, const Struct_field* field)
12472 : Expression(EXPRESSION_STRUCT_FIELD_OFFSET, BUILTINS_LOCATION),
12473 type_(type), field_(field)
12479 { return Type::lookup_integer_type("uintptr"); }
12482 do_determine_type(const Type_context*)
12490 do_get_tree(Translate_context* context);
12493 // The type of the struct.
12494 Struct_type* type_;
12496 const Struct_field* field_;
12499 // Return a struct field offset in GENERIC.
12502 Struct_field_offset_expression::do_get_tree(Translate_context* context)
12504 tree type_tree = this->type_->get_tree(context->gogo());
12505 if (type_tree == error_mark_node)
12506 return error_mark_node;
12508 tree val_type_tree = this->type()->get_tree(context->gogo());
12509 gcc_assert(val_type_tree != error_mark_node);
12511 const Struct_field_list* fields = this->type_->fields();
12512 tree struct_field_tree = TYPE_FIELDS(type_tree);
12513 Struct_field_list::const_iterator p;
12514 for (p = fields->begin();
12515 p != fields->end();
12516 ++p, struct_field_tree = DECL_CHAIN(struct_field_tree))
12518 gcc_assert(struct_field_tree != NULL_TREE);
12519 if (&*p == this->field_)
12522 gcc_assert(&*p == this->field_);
12524 return fold_convert_loc(BUILTINS_LOCATION, val_type_tree,
12525 byte_position(struct_field_tree));
12528 // Make an expression for a struct field offset.
12531 Expression::make_struct_field_offset(Struct_type* type,
12532 const Struct_field* field)
12534 return new Struct_field_offset_expression(type, field);
12537 // An expression which evaluates to the address of an unnamed label.
12539 class Label_addr_expression : public Expression
12542 Label_addr_expression(Label* label, source_location location)
12543 : Expression(EXPRESSION_LABEL_ADDR, location),
12550 { return Type::make_pointer_type(Type::make_void_type()); }
12553 do_determine_type(const Type_context*)
12558 { return new Label_addr_expression(this->label_, this->location()); }
12561 do_get_tree(Translate_context*)
12562 { return this->label_->get_addr(this->location()); }
12565 // The label whose address we are taking.
12569 // Make an expression for the address of an unnamed label.
12572 Expression::make_label_addr(Label* label, source_location location)
12574 return new Label_addr_expression(label, location);
12577 // Import an expression. This comes at the end in order to see the
12578 // various class definitions.
12581 Expression::import_expression(Import* imp)
12583 int c = imp->peek_char();
12584 if (imp->match_c_string("- ")
12585 || imp->match_c_string("! ")
12586 || imp->match_c_string("^ "))
12587 return Unary_expression::do_import(imp);
12589 return Binary_expression::do_import(imp);
12590 else if (imp->match_c_string("true")
12591 || imp->match_c_string("false"))
12592 return Boolean_expression::do_import(imp);
12594 return String_expression::do_import(imp);
12595 else if (c == '-' || (c >= '0' && c <= '9'))
12597 // This handles integers, floats and complex constants.
12598 return Integer_expression::do_import(imp);
12600 else if (imp->match_c_string("nil"))
12601 return Nil_expression::do_import(imp);
12602 else if (imp->match_c_string("convert"))
12603 return Type_conversion_expression::do_import(imp);
12606 error_at(imp->location(), "import error: expected expression");
12607 return Expression::make_error(imp->location());
12611 // Class Expression_list.
12613 // Traverse the list.
12616 Expression_list::traverse(Traverse* traverse)
12618 for (Expression_list::iterator p = this->begin();
12624 if (Expression::traverse(&*p, traverse) == TRAVERSE_EXIT)
12625 return TRAVERSE_EXIT;
12628 return TRAVERSE_CONTINUE;
12634 Expression_list::copy()
12636 Expression_list* ret = new Expression_list();
12637 for (Expression_list::iterator p = this->begin();
12642 ret->push_back(NULL);
12644 ret->push_back((*p)->copy());
12649 // Return whether an expression list has an error expression.
12652 Expression_list::contains_error() const
12654 for (Expression_list::const_iterator p = this->begin();
12657 if (*p != NULL && (*p)->is_error_expression())