1 // types.cc -- Go frontend types.
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.
13 #include "go-diagnostics.h"
14 #include "go-encode-id.h"
16 #include "expressions.h"
17 #include "statements.h"
23 // Forward declarations so that we don't have to make types.h #include
27 get_backend_struct_fields(Gogo
* gogo
, const Struct_field_list
* fields
,
29 std::vector
<Backend::Btyped_identifier
>* bfields
);
32 get_backend_slice_fields(Gogo
* gogo
, Array_type
* type
, bool use_placeholder
,
33 std::vector
<Backend::Btyped_identifier
>* bfields
);
36 get_backend_interface_fields(Gogo
* gogo
, Interface_type
* type
,
38 std::vector
<Backend::Btyped_identifier
>* bfields
);
42 Type::Type(Type_classification classification
)
43 : classification_(classification
), btype_(NULL
), type_descriptor_var_(NULL
),
52 // Get the base type for a type--skip names and forward declarations.
57 switch (this->classification_
)
60 return this->named_type()->named_base();
62 return this->forward_declaration_type()->real_type()->base();
71 switch (this->classification_
)
74 return this->named_type()->named_base();
76 return this->forward_declaration_type()->real_type()->base();
82 // Skip defined forward declarations.
88 Forward_declaration_type
* ftype
= t
->forward_declaration_type();
89 while (ftype
!= NULL
&& ftype
->is_defined())
91 t
= ftype
->real_type();
92 ftype
= t
->forward_declaration_type();
98 Type::forwarded() const
100 const Type
* t
= this;
101 const Forward_declaration_type
* ftype
= t
->forward_declaration_type();
102 while (ftype
!= NULL
&& ftype
->is_defined())
104 t
= ftype
->real_type();
105 ftype
= t
->forward_declaration_type();
110 // Skip alias definitions.
115 Type
* t
= this->forwarded();
116 Named_type
* nt
= t
->named_type();
117 while (nt
!= NULL
&& nt
->is_alias())
119 t
= nt
->real_type()->forwarded();
120 nt
= t
->named_type();
126 Type::unalias() const
128 const Type
* t
= this->forwarded();
129 const Named_type
* nt
= t
->named_type();
130 while (nt
!= NULL
&& nt
->is_alias())
132 t
= nt
->real_type()->forwarded();
133 nt
= t
->named_type();
138 // If this is a named type, return it. Otherwise, return NULL.
143 return this->forwarded()->convert_no_base
<Named_type
, TYPE_NAMED
>();
147 Type::named_type() const
149 return this->forwarded()->convert_no_base
<const Named_type
, TYPE_NAMED
>();
152 // Return true if this type is not defined.
155 Type::is_undefined() const
157 return this->forwarded()->forward_declaration_type() != NULL
;
160 // Return true if this is a basic type: a type which is not composed
161 // of other types, and is not void.
164 Type::is_basic_type() const
166 switch (this->classification_
)
189 return this->base()->is_basic_type();
196 // Return true if this is an abstract type.
199 Type::is_abstract() const
201 switch (this->classification())
204 return this->integer_type()->is_abstract();
206 return this->float_type()->is_abstract();
208 return this->complex_type()->is_abstract();
210 return this->is_abstract_string_type();
212 return this->is_abstract_boolean_type();
218 // Return a non-abstract version of an abstract type.
221 Type::make_non_abstract_type()
223 go_assert(this->is_abstract());
224 switch (this->classification())
227 if (this->integer_type()->is_rune())
228 return Type::lookup_integer_type("int32");
230 return Type::lookup_integer_type("int");
232 return Type::lookup_float_type("float64");
234 return Type::lookup_complex_type("complex128");
236 return Type::lookup_string_type();
238 return Type::lookup_bool_type();
244 // Return true if this is an error type. Don't give an error if we
245 // try to dereference an undefined forwarding type, as this is called
246 // in the parser when the type may legitimately be undefined.
249 Type::is_error_type() const
251 const Type
* t
= this->forwarded();
252 // Note that we return false for an undefined forward type.
253 switch (t
->classification_
)
258 return t
->named_type()->is_named_error_type();
264 // If this is a pointer type, return the type to which it points.
265 // Otherwise, return NULL.
268 Type::points_to() const
270 const Pointer_type
* ptype
= this->convert
<const Pointer_type
,
272 return ptype
== NULL
? NULL
: ptype
->points_to();
275 // Return whether this is a slice type.
278 Type::is_slice_type() const
280 return this->array_type() != NULL
&& this->array_type()->length() == NULL
;
283 // Return whether this is the predeclared constant nil being used as a
287 Type::is_nil_constant_as_type() const
289 const Type
* t
= this->forwarded();
290 if (t
->forward_declaration_type() != NULL
)
292 const Named_object
* no
= t
->forward_declaration_type()->named_object();
293 if (no
->is_unknown())
294 no
= no
->unknown_value()->real_named_object();
297 && no
->const_value()->expr()->is_nil_expression())
306 Type::traverse(Type
* type
, Traverse
* traverse
)
308 go_assert((traverse
->traverse_mask() & Traverse::traverse_types
) != 0
309 || (traverse
->traverse_mask()
310 & Traverse::traverse_expressions
) != 0);
311 if (traverse
->remember_type(type
))
313 // We have already traversed this type.
314 return TRAVERSE_CONTINUE
;
316 if ((traverse
->traverse_mask() & Traverse::traverse_types
) != 0)
318 int t
= traverse
->type(type
);
319 if (t
== TRAVERSE_EXIT
)
320 return TRAVERSE_EXIT
;
321 else if (t
== TRAVERSE_SKIP_COMPONENTS
)
322 return TRAVERSE_CONTINUE
;
324 // An array type has an expression which we need to traverse if
325 // traverse_expressions is set.
326 if (type
->do_traverse(traverse
) == TRAVERSE_EXIT
)
327 return TRAVERSE_EXIT
;
328 return TRAVERSE_CONTINUE
;
331 // Default implementation for do_traverse for child class.
334 Type::do_traverse(Traverse
*)
336 return TRAVERSE_CONTINUE
;
339 // Return whether two types are identical. If ERRORS_ARE_IDENTICAL,
340 // then return true for all erroneous types; this is used to avoid
341 // cascading errors. If REASON is not NULL, optionally set *REASON to
342 // the reason the types are not identical.
345 Type::are_identical(const Type
* t1
, const Type
* t2
, bool errors_are_identical
,
348 return Type::are_identical_cmp_tags(t1
, t2
, COMPARE_TAGS
,
349 errors_are_identical
, reason
);
352 // Like are_identical, but with a CMP_TAGS parameter.
355 Type::are_identical_cmp_tags(const Type
* t1
, const Type
* t2
, Cmp_tags cmp_tags
,
356 bool errors_are_identical
, std::string
* reason
)
358 if (t1
== NULL
|| t2
== NULL
)
360 // Something is wrong.
361 return errors_are_identical
? true : t1
== t2
;
364 // Skip defined forward declarations. Ignore aliases.
371 // An undefined forward declaration is an error.
372 if (t1
->forward_declaration_type() != NULL
373 || t2
->forward_declaration_type() != NULL
)
374 return errors_are_identical
;
376 // Avoid cascading errors with error types.
377 if (t1
->is_error_type() || t2
->is_error_type())
379 if (errors_are_identical
)
381 return t1
->is_error_type() && t2
->is_error_type();
384 // Get a good reason for the sink type. Note that the sink type on
385 // the left hand side of an assignment is handled in are_assignable.
386 if (t1
->is_sink_type() || t2
->is_sink_type())
389 *reason
= "invalid use of _";
393 // A named type is only identical to itself.
394 if (t1
->named_type() != NULL
|| t2
->named_type() != NULL
)
397 // Check type shapes.
398 if (t1
->classification() != t2
->classification())
401 switch (t1
->classification())
407 // These types are always identical.
411 return t1
->integer_type()->is_identical(t2
->integer_type());
414 return t1
->float_type()->is_identical(t2
->float_type());
417 return t1
->complex_type()->is_identical(t2
->complex_type());
420 return t1
->function_type()->is_identical(t2
->function_type(),
423 errors_are_identical
,
427 return Type::are_identical_cmp_tags(t1
->points_to(), t2
->points_to(),
428 cmp_tags
, errors_are_identical
,
432 return t1
->struct_type()->is_identical(t2
->struct_type(), cmp_tags
,
433 errors_are_identical
);
436 return t1
->array_type()->is_identical(t2
->array_type(), cmp_tags
,
437 errors_are_identical
);
440 return t1
->map_type()->is_identical(t2
->map_type(), cmp_tags
,
441 errors_are_identical
);
444 return t1
->channel_type()->is_identical(t2
->channel_type(), cmp_tags
,
445 errors_are_identical
);
448 return t1
->interface_type()->is_identical(t2
->interface_type(), cmp_tags
,
449 errors_are_identical
);
451 case TYPE_CALL_MULTIPLE_RESULT
:
453 *reason
= "invalid use of multiple-value function call";
461 // Return true if it's OK to have a binary operation with types LHS
462 // and RHS. This is not used for shifts or comparisons.
465 Type::are_compatible_for_binop(const Type
* lhs
, const Type
* rhs
)
467 if (Type::are_identical(lhs
, rhs
, true, NULL
))
470 // A constant of abstract bool type may be mixed with any bool type.
471 if ((rhs
->is_abstract_boolean_type() && lhs
->is_boolean_type())
472 || (lhs
->is_abstract_boolean_type() && rhs
->is_boolean_type()))
475 // A constant of abstract string type may be mixed with any string
477 if ((rhs
->is_abstract_string_type() && lhs
->is_string_type())
478 || (lhs
->is_abstract_string_type() && rhs
->is_string_type()))
484 // A constant of abstract integer, float, or complex type may be
485 // mixed with an integer, float, or complex type.
486 if ((rhs
->is_abstract()
487 && (rhs
->integer_type() != NULL
488 || rhs
->float_type() != NULL
489 || rhs
->complex_type() != NULL
)
490 && (lhs
->integer_type() != NULL
491 || lhs
->float_type() != NULL
492 || lhs
->complex_type() != NULL
))
493 || (lhs
->is_abstract()
494 && (lhs
->integer_type() != NULL
495 || lhs
->float_type() != NULL
496 || lhs
->complex_type() != NULL
)
497 && (rhs
->integer_type() != NULL
498 || rhs
->float_type() != NULL
499 || rhs
->complex_type() != NULL
)))
502 // The nil type may be compared to a pointer, an interface type, a
503 // slice type, a channel type, a map type, or a function type.
504 if (lhs
->is_nil_type()
505 && (rhs
->points_to() != NULL
506 || rhs
->interface_type() != NULL
507 || rhs
->is_slice_type()
508 || rhs
->map_type() != NULL
509 || rhs
->channel_type() != NULL
510 || rhs
->function_type() != NULL
))
512 if (rhs
->is_nil_type()
513 && (lhs
->points_to() != NULL
514 || lhs
->interface_type() != NULL
515 || lhs
->is_slice_type()
516 || lhs
->map_type() != NULL
517 || lhs
->channel_type() != NULL
518 || lhs
->function_type() != NULL
))
524 // Return true if a value with type T1 may be compared with a value of
525 // type T2. IS_EQUALITY_OP is true for == or !=, false for <, etc.
528 Type::are_compatible_for_comparison(bool is_equality_op
, const Type
*t1
,
529 const Type
*t2
, std::string
*reason
)
532 && !Type::are_assignable(t1
, t2
, NULL
)
533 && !Type::are_assignable(t2
, t1
, NULL
))
536 *reason
= "incompatible types in binary expression";
542 if (t1
->integer_type() == NULL
543 && t1
->float_type() == NULL
544 && !t1
->is_string_type())
547 *reason
= _("invalid comparison of non-ordered type");
551 else if (t1
->is_slice_type()
552 || t1
->map_type() != NULL
553 || t1
->function_type() != NULL
554 || t2
->is_slice_type()
555 || t2
->map_type() != NULL
556 || t2
->function_type() != NULL
)
558 if (!t1
->is_nil_type() && !t2
->is_nil_type())
562 if (t1
->is_slice_type() || t2
->is_slice_type())
563 *reason
= _("slice can only be compared to nil");
564 else if (t1
->map_type() != NULL
|| t2
->map_type() != NULL
)
565 *reason
= _("map can only be compared to nil");
567 *reason
= _("func can only be compared to nil");
569 // Match 6g error messages.
570 if (t1
->interface_type() != NULL
|| t2
->interface_type() != NULL
)
573 snprintf(buf
, sizeof buf
, _("invalid operation (%s)"),
583 if (!t1
->is_boolean_type()
584 && t1
->integer_type() == NULL
585 && t1
->float_type() == NULL
586 && t1
->complex_type() == NULL
587 && !t1
->is_string_type()
588 && t1
->points_to() == NULL
589 && t1
->channel_type() == NULL
590 && t1
->interface_type() == NULL
591 && t1
->struct_type() == NULL
592 && t1
->array_type() == NULL
593 && !t1
->is_nil_type())
596 *reason
= _("invalid comparison of non-comparable type");
600 if (t1
->unalias()->named_type() != NULL
)
601 return t1
->unalias()->named_type()->named_type_is_comparable(reason
);
602 else if (t2
->unalias()->named_type() != NULL
)
603 return t2
->unalias()->named_type()->named_type_is_comparable(reason
);
604 else if (t1
->struct_type() != NULL
)
606 if (t1
->struct_type()->is_struct_incomparable())
609 *reason
= _("invalid comparison of generated struct");
612 const Struct_field_list
* fields
= t1
->struct_type()->fields();
613 for (Struct_field_list::const_iterator p
= fields
->begin();
617 if (!p
->type()->is_comparable())
620 *reason
= _("invalid comparison of non-comparable struct");
625 else if (t1
->array_type() != NULL
)
627 if (t1
->array_type()->is_array_incomparable())
630 *reason
= _("invalid comparison of generated array");
633 if (t1
->array_type()->length()->is_nil_expression()
634 || !t1
->array_type()->element_type()->is_comparable())
637 *reason
= _("invalid comparison of non-comparable array");
646 // Return true if a value with type RHS may be assigned to a variable
647 // with type LHS. If REASON is not NULL, set *REASON to the reason
648 // the types are not assignable.
651 Type::are_assignable(const Type
* lhs
, const Type
* rhs
, std::string
* reason
)
653 // Do some checks first. Make sure the types are defined.
654 if (rhs
!= NULL
&& !rhs
->is_undefined())
656 if (rhs
->is_void_type())
659 *reason
= "non-value used as value";
662 if (rhs
->is_call_multiple_result_type())
665 reason
->assign(_("multiple-value function call in "
666 "single-value context"));
671 // Any value may be assigned to the blank identifier.
673 && !lhs
->is_undefined()
674 && lhs
->is_sink_type())
677 // Identical types are assignable.
678 if (Type::are_identical(lhs
, rhs
, true, reason
))
681 // Ignore aliases, except for error messages.
682 const Type
* lhs_orig
= lhs
;
683 const Type
* rhs_orig
= rhs
;
684 lhs
= lhs
->unalias();
685 rhs
= rhs
->unalias();
687 // The types are assignable if they have identical underlying types
688 // and either LHS or RHS is not a named type.
689 if (((lhs
->named_type() != NULL
&& rhs
->named_type() == NULL
)
690 || (rhs
->named_type() != NULL
&& lhs
->named_type() == NULL
))
691 && Type::are_identical(lhs
->base(), rhs
->base(), true, reason
))
694 // The types are assignable if LHS is an interface type and RHS
695 // implements the required methods.
696 const Interface_type
* lhs_interface_type
= lhs
->interface_type();
697 if (lhs_interface_type
!= NULL
)
699 if (lhs_interface_type
->implements_interface(rhs
, reason
))
701 const Interface_type
* rhs_interface_type
= rhs
->interface_type();
702 if (rhs_interface_type
!= NULL
703 && lhs_interface_type
->is_compatible_for_assign(rhs_interface_type
,
708 // The type are assignable if RHS is a bidirectional channel type,
709 // LHS is a channel type, they have identical element types, and
710 // either LHS or RHS is not a named type.
711 if (lhs
->channel_type() != NULL
712 && rhs
->channel_type() != NULL
713 && rhs
->channel_type()->may_send()
714 && rhs
->channel_type()->may_receive()
715 && (lhs
->named_type() == NULL
|| rhs
->named_type() == NULL
)
716 && Type::are_identical(lhs
->channel_type()->element_type(),
717 rhs
->channel_type()->element_type(),
722 // The nil type may be assigned to a pointer, function, slice, map,
723 // channel, or interface type.
724 if (rhs
->is_nil_type()
725 && (lhs
->points_to() != NULL
726 || lhs
->function_type() != NULL
727 || lhs
->is_slice_type()
728 || lhs
->map_type() != NULL
729 || lhs
->channel_type() != NULL
730 || lhs
->interface_type() != NULL
))
733 // An untyped numeric constant may be assigned to a numeric type if
734 // it is representable in that type.
735 if ((rhs
->is_abstract()
736 && (rhs
->integer_type() != NULL
737 || rhs
->float_type() != NULL
738 || rhs
->complex_type() != NULL
))
739 && (lhs
->integer_type() != NULL
740 || lhs
->float_type() != NULL
741 || lhs
->complex_type() != NULL
))
744 // Give some better error messages.
745 if (reason
!= NULL
&& reason
->empty())
747 if (rhs
->interface_type() != NULL
)
748 reason
->assign(_("need explicit conversion"));
749 else if (lhs_orig
->named_type() != NULL
750 && rhs_orig
->named_type() != NULL
)
752 size_t len
= (lhs_orig
->named_type()->name().length()
753 + rhs_orig
->named_type()->name().length()
755 char* buf
= new char[len
];
756 snprintf(buf
, len
, _("cannot use type %s as type %s"),
757 rhs_orig
->named_type()->message_name().c_str(),
758 lhs_orig
->named_type()->message_name().c_str());
767 // Return true if a value with type RHS may be converted to type LHS.
768 // If REASON is not NULL, set *REASON to the reason the types are not
772 Type::are_convertible(const Type
* lhs
, const Type
* rhs
, std::string
* reason
)
774 // The types are convertible if they are assignable.
775 if (Type::are_assignable(lhs
, rhs
, reason
))
779 lhs
= lhs
->unalias();
780 rhs
= rhs
->unalias();
782 // A pointer to a regular type may not be converted to a pointer to
783 // a type that may not live in the heap, except when converting from
785 if (lhs
->points_to() != NULL
786 && rhs
->points_to() != NULL
787 && !lhs
->points_to()->in_heap()
788 && rhs
->points_to()->in_heap()
789 && !rhs
->is_unsafe_pointer_type())
792 reason
->assign(_("conversion from normal type to notinheap type"));
796 // The types are convertible if they have identical underlying
797 // types, ignoring struct field tags.
798 if ((lhs
->named_type() != NULL
|| rhs
->named_type() != NULL
)
799 && Type::are_identical_cmp_tags(lhs
->base(), rhs
->base(), IGNORE_TAGS
,
803 // The types are convertible if they are both unnamed pointer types
804 // and their pointer base types have identical underlying types,
805 // ignoring struct field tags.
806 if (lhs
->named_type() == NULL
807 && rhs
->named_type() == NULL
808 && lhs
->points_to() != NULL
809 && rhs
->points_to() != NULL
810 && (lhs
->points_to()->named_type() != NULL
811 || rhs
->points_to()->named_type() != NULL
)
812 && Type::are_identical_cmp_tags(lhs
->points_to()->base(),
813 rhs
->points_to()->base(),
819 // Integer and floating point types are convertible to each other.
820 if ((lhs
->integer_type() != NULL
|| lhs
->float_type() != NULL
)
821 && (rhs
->integer_type() != NULL
|| rhs
->float_type() != NULL
))
824 // Complex types are convertible to each other.
825 if (lhs
->complex_type() != NULL
&& rhs
->complex_type() != NULL
)
828 // An integer, or []byte, or []rune, may be converted to a string.
829 if (lhs
->is_string_type())
831 if (rhs
->integer_type() != NULL
)
833 if (rhs
->is_slice_type())
835 const Type
* e
= rhs
->array_type()->element_type()->forwarded();
836 if (e
->integer_type() != NULL
837 && (e
->integer_type()->is_byte()
838 || e
->integer_type()->is_rune()))
843 // A string may be converted to []byte or []rune.
844 if (rhs
->is_string_type() && lhs
->is_slice_type())
846 const Type
* e
= lhs
->array_type()->element_type()->forwarded();
847 if (e
->integer_type() != NULL
848 && (e
->integer_type()->is_byte() || e
->integer_type()->is_rune()))
852 // An unsafe.Pointer type may be converted to any pointer type or to
853 // a type whose underlying type is uintptr, and vice-versa.
854 if (lhs
->is_unsafe_pointer_type()
855 && (rhs
->points_to() != NULL
856 || (rhs
->integer_type() != NULL
857 && rhs
->integer_type() == Type::lookup_integer_type("uintptr")->real_type())))
859 if (rhs
->is_unsafe_pointer_type()
860 && (lhs
->points_to() != NULL
861 || (lhs
->integer_type() != NULL
862 && lhs
->integer_type() == Type::lookup_integer_type("uintptr")->real_type())))
865 // Give a better error message.
869 *reason
= "invalid type conversion";
872 std::string s
= "invalid type conversion (";
882 // Copy expressions if it may change the size.
884 // The only type that has an expression is an array type. The only
885 // types whose size can be changed by the size of an array type are an
886 // array type itself, or a struct type with an array field.
888 Type::copy_expressions()
890 // This is run during parsing, so types may not be valid yet.
891 // We only have to worry about array type literals.
892 switch (this->classification_
)
899 Array_type
* at
= this->array_type();
900 if (at
->length() == NULL
)
902 Expression
* len
= at
->length()->copy();
903 if (at
->length() == len
)
905 return Type::make_array_type(at
->element_type(), len
);
910 Struct_type
* st
= this->struct_type();
911 const Struct_field_list
* sfl
= st
->fields();
914 bool changed
= false;
915 Struct_field_list
*nsfl
= new Struct_field_list();
916 for (Struct_field_list::const_iterator pf
= sfl
->begin();
920 Type
* ft
= pf
->type()->copy_expressions();
921 Struct_field
nf(Typed_identifier((pf
->is_anonymous()
927 nf
.set_tag(pf
->tag());
929 if (ft
!= pf
->type())
937 return Type::make_struct_type(nsfl
, st
->location());
944 // Return a hash code for the type to be used for method lookup.
947 Type::hash_for_method(Gogo
* gogo
) const
949 if (this->named_type() != NULL
&& this->named_type()->is_alias())
950 return this->named_type()->real_type()->hash_for_method(gogo
);
951 unsigned int ret
= 0;
952 if (this->classification_
!= TYPE_FORWARD
)
953 ret
+= this->classification_
;
954 return ret
+ this->do_hash_for_method(gogo
);
957 // Default implementation of do_hash_for_method. This is appropriate
958 // for types with no subfields.
961 Type::do_hash_for_method(Gogo
*) const
966 // Return a hash code for a string, given a starting hash.
969 Type::hash_string(const std::string
& s
, unsigned int h
)
971 const char* p
= s
.data();
972 size_t len
= s
.length();
973 for (; len
> 0; --len
)
981 // A hash table mapping unnamed types to the backend representation of
984 Type::Type_btypes
Type::type_btypes
;
986 // Return the backend representation for this type.
989 Type::get_backend(Gogo
* gogo
)
991 if (this->btype_
!= NULL
)
994 if (this->named_type() != NULL
&& this->named_type()->is_alias()) {
995 Btype
* bt
= this->unalias()->get_backend(gogo
);
996 if (gogo
!= NULL
&& gogo
->named_types_are_converted())
1001 if (this->forward_declaration_type() != NULL
1002 || this->named_type() != NULL
)
1003 return this->get_btype_without_hash(gogo
);
1005 if (this->is_error_type())
1006 return gogo
->backend()->error_type();
1008 // To avoid confusing the backend, translate all identical Go types
1009 // to the same backend representation. We use a hash table to do
1010 // that. There is no need to use the hash table for named types, as
1011 // named types are only identical to themselves.
1013 std::pair
<Type
*, Type_btype_entry
> val
;
1015 val
.second
.btype
= NULL
;
1016 val
.second
.is_placeholder
= false;
1017 std::pair
<Type_btypes::iterator
, bool> ins
=
1018 Type::type_btypes
.insert(val
);
1019 if (!ins
.second
&& ins
.first
->second
.btype
!= NULL
)
1021 // Note that GOGO can be NULL here, but only when the GCC
1022 // middle-end is asking for a frontend type. That will only
1023 // happen for simple types, which should never require
1025 if (!ins
.first
->second
.is_placeholder
)
1026 this->btype_
= ins
.first
->second
.btype
;
1027 else if (gogo
->named_types_are_converted())
1029 this->finish_backend(gogo
, ins
.first
->second
.btype
);
1030 ins
.first
->second
.is_placeholder
= false;
1033 return ins
.first
->second
.btype
;
1036 Btype
* bt
= this->get_btype_without_hash(gogo
);
1038 if (ins
.first
->second
.btype
== NULL
)
1040 ins
.first
->second
.btype
= bt
;
1041 ins
.first
->second
.is_placeholder
= false;
1045 // We have already created a backend representation for this
1046 // type. This can happen when an unnamed type is defined using
1047 // a named type which in turns uses an identical unnamed type.
1048 // Use the representation we created earlier and ignore the one we just
1050 if (this->btype_
== bt
)
1051 this->btype_
= ins
.first
->second
.btype
;
1052 bt
= ins
.first
->second
.btype
;
1058 // Return the backend representation for a type without looking in the
1059 // hash table for identical types. This is used for named types,
1060 // since a named type is never identical to any other type.
1063 Type::get_btype_without_hash(Gogo
* gogo
)
1065 if (this->btype_
== NULL
)
1067 Btype
* bt
= this->do_get_backend(gogo
);
1069 // For a recursive function or pointer type, we will temporarily
1070 // return a circular pointer type during the recursion. We
1071 // don't want to record that for a forwarding type, as it may
1072 // confuse us later.
1073 if (this->forward_declaration_type() != NULL
1074 && gogo
->backend()->is_circular_pointer_type(bt
))
1077 if (gogo
== NULL
|| !gogo
->named_types_are_converted())
1082 return this->btype_
;
1085 // Get the backend representation of a type without forcing the
1086 // creation of the backend representation of all supporting types.
1087 // This will return a backend type that has the correct size but may
1088 // be incomplete. E.g., a pointer will just be a placeholder pointer,
1089 // and will not contain the final representation of the type to which
1090 // it points. This is used while converting all named types to the
1091 // backend representation, to avoid problems with indirect references
1092 // to types which are not yet complete. When this is called, the
1093 // sizes of all direct references (e.g., a struct field) should be
1094 // known, but the sizes of indirect references (e.g., the type to
1095 // which a pointer points) may not.
1098 Type::get_backend_placeholder(Gogo
* gogo
)
1100 if (gogo
->named_types_are_converted())
1101 return this->get_backend(gogo
);
1102 if (this->btype_
!= NULL
)
1103 return this->btype_
;
1106 switch (this->classification_
)
1116 // These are simple types that can just be created directly.
1117 return this->get_backend(gogo
);
1121 // All maps and channels have the same backend representation.
1122 return this->get_backend(gogo
);
1126 // Named types keep track of their own dependencies and manage
1127 // their own placeholders.
1128 return this->get_backend(gogo
);
1130 case TYPE_INTERFACE
:
1131 if (this->interface_type()->is_empty())
1132 return Interface_type::get_backend_empty_interface_type(gogo
);
1139 std::pair
<Type
*, Type_btype_entry
> val
;
1141 val
.second
.btype
= NULL
;
1142 val
.second
.is_placeholder
= false;
1143 std::pair
<Type_btypes::iterator
, bool> ins
=
1144 Type::type_btypes
.insert(val
);
1145 if (!ins
.second
&& ins
.first
->second
.btype
!= NULL
)
1146 return ins
.first
->second
.btype
;
1148 switch (this->classification_
)
1152 // A Go function type is a pointer to a struct type.
1153 Location loc
= this->function_type()->location();
1154 bt
= gogo
->backend()->placeholder_pointer_type("", loc
, false);
1160 Location loc
= Linemap::unknown_location();
1161 bt
= gogo
->backend()->placeholder_pointer_type("", loc
, false);
1162 Pointer_type
* pt
= this->convert
<Pointer_type
, TYPE_POINTER
>();
1163 Type::placeholder_pointers
.push_back(pt
);
1168 // We don't have to make the struct itself be a placeholder. We
1169 // are promised that we know the sizes of the struct fields.
1170 // But we may have to use a placeholder for any particular
1173 std::vector
<Backend::Btyped_identifier
> bfields
;
1174 get_backend_struct_fields(gogo
, this->struct_type()->fields(),
1176 bt
= gogo
->backend()->struct_type(bfields
);
1181 if (this->is_slice_type())
1183 std::vector
<Backend::Btyped_identifier
> bfields
;
1184 get_backend_slice_fields(gogo
, this->array_type(), true, &bfields
);
1185 bt
= gogo
->backend()->struct_type(bfields
);
1189 Btype
* element
= this->array_type()->get_backend_element(gogo
, true);
1190 Bexpression
* len
= this->array_type()->get_backend_length(gogo
);
1191 bt
= gogo
->backend()->array_type(element
, len
);
1195 case TYPE_INTERFACE
:
1197 go_assert(!this->interface_type()->is_empty());
1198 std::vector
<Backend::Btyped_identifier
> bfields
;
1199 get_backend_interface_fields(gogo
, this->interface_type(), true,
1201 bt
= gogo
->backend()->struct_type(bfields
);
1206 case TYPE_CALL_MULTIPLE_RESULT
:
1207 /* Note that various classifications were handled in the earlier
1213 if (ins
.first
->second
.btype
== NULL
)
1215 ins
.first
->second
.btype
= bt
;
1216 ins
.first
->second
.is_placeholder
= true;
1220 // A placeholder for this type got created along the way. Use
1221 // that one and ignore the one we just built.
1222 bt
= ins
.first
->second
.btype
;
1228 // Complete the backend representation. This is called for a type
1229 // using a placeholder type.
1232 Type::finish_backend(Gogo
* gogo
, Btype
*placeholder
)
1234 switch (this->classification_
)
1248 Btype
* bt
= this->do_get_backend(gogo
);
1249 if (!gogo
->backend()->set_placeholder_pointer_type(placeholder
, bt
))
1250 go_assert(saw_errors());
1256 Btype
* bt
= this->do_get_backend(gogo
);
1257 if (!gogo
->backend()->set_placeholder_pointer_type(placeholder
, bt
))
1258 go_assert(saw_errors());
1263 // The struct type itself is done, but we have to make sure that
1264 // all the field types are converted.
1265 this->struct_type()->finish_backend_fields(gogo
);
1269 // The array type itself is done, but make sure the element type
1271 this->array_type()->finish_backend_element(gogo
);
1278 case TYPE_INTERFACE
:
1279 // The interface type itself is done, but make sure the method
1280 // types are converted.
1281 this->interface_type()->finish_backend_methods(gogo
);
1289 case TYPE_CALL_MULTIPLE_RESULT
:
1294 this->btype_
= placeholder
;
1297 // Return a pointer to the type descriptor for this type.
1300 Type::type_descriptor_pointer(Gogo
* gogo
, Location location
)
1302 Type
* t
= this->unalias();
1303 if (t
->type_descriptor_var_
== NULL
)
1305 t
->make_type_descriptor_var(gogo
);
1306 go_assert(t
->type_descriptor_var_
!= NULL
);
1308 Bexpression
* var_expr
=
1309 gogo
->backend()->var_expression(t
->type_descriptor_var_
, location
);
1310 Bexpression
* var_addr
=
1311 gogo
->backend()->address_expression(var_expr
, location
);
1312 Type
* td_type
= Type::make_type_descriptor_type();
1313 Btype
* td_btype
= td_type
->get_backend(gogo
);
1314 Btype
* ptd_btype
= gogo
->backend()->pointer_type(td_btype
);
1315 return gogo
->backend()->convert_expression(ptd_btype
, var_addr
, location
);
1318 // A mapping from unnamed types to type descriptor variables.
1320 Type::Type_descriptor_vars
Type::type_descriptor_vars
;
1322 // Build the type descriptor for this type.
1325 Type::make_type_descriptor_var(Gogo
* gogo
)
1327 go_assert(this->type_descriptor_var_
== NULL
);
1329 Named_type
* nt
= this->named_type();
1331 // We can have multiple instances of unnamed types, but we only want
1332 // to emit the type descriptor once. We use a hash table. This is
1333 // not necessary for named types, as they are unique, and we store
1334 // the type descriptor in the type itself.
1335 Bvariable
** phash
= NULL
;
1338 Bvariable
* bvnull
= NULL
;
1339 std::pair
<Type_descriptor_vars::iterator
, bool> ins
=
1340 Type::type_descriptor_vars
.insert(std::make_pair(this, bvnull
));
1343 // We've already built a type descriptor for this type.
1344 this->type_descriptor_var_
= ins
.first
->second
;
1347 phash
= &ins
.first
->second
;
1350 // The type descriptor symbol for the unsafe.Pointer type is defined in
1351 // libgo/go-unsafe-pointer.c, so we just return a reference to that
1352 // symbol if necessary.
1353 if (this->is_unsafe_pointer_type())
1355 Location bloc
= Linemap::predeclared_location();
1357 Type
* td_type
= Type::make_type_descriptor_type();
1358 Btype
* td_btype
= td_type
->get_backend(gogo
);
1359 std::string name
= gogo
->type_descriptor_name(this, nt
);
1360 std::string
asm_name(go_selectively_encode_id(name
));
1361 this->type_descriptor_var_
=
1362 gogo
->backend()->immutable_struct_reference(name
, asm_name
,
1367 *phash
= this->type_descriptor_var_
;
1371 std::string var_name
= gogo
->type_descriptor_name(this, nt
);
1373 // Build the contents of the type descriptor.
1374 Expression
* initializer
= this->do_type_descriptor(gogo
, NULL
);
1376 Btype
* initializer_btype
= initializer
->type()->get_backend(gogo
);
1378 Location loc
= nt
== NULL
? Linemap::predeclared_location() : nt
->location();
1380 const Package
* dummy
;
1381 if (this->type_descriptor_defined_elsewhere(nt
, &dummy
))
1383 std::string
asm_name(go_selectively_encode_id(var_name
));
1384 this->type_descriptor_var_
=
1385 gogo
->backend()->immutable_struct_reference(var_name
, asm_name
,
1389 *phash
= this->type_descriptor_var_
;
1393 // See if this type descriptor can appear in multiple packages.
1394 bool is_common
= false;
1397 // We create the descriptor for a builtin type whenever we need
1399 is_common
= nt
->is_builtin();
1403 // This is an unnamed type. The descriptor could be defined in
1404 // any package where it is needed, and the linker will pick one
1405 // descriptor to keep.
1409 // We are going to build the type descriptor in this package. We
1410 // must create the variable before we convert the initializer to the
1411 // backend representation, because the initializer may refer to the
1412 // type descriptor of this type. By setting type_descriptor_var_ we
1413 // ensure that type_descriptor_pointer will work if called while
1414 // converting INITIALIZER.
1416 std::string
asm_name(go_selectively_encode_id(var_name
));
1417 this->type_descriptor_var_
=
1418 gogo
->backend()->immutable_struct(var_name
, asm_name
, false, is_common
,
1419 initializer_btype
, loc
);
1421 *phash
= this->type_descriptor_var_
;
1423 Translate_context
context(gogo
, NULL
, NULL
, NULL
);
1424 context
.set_is_const();
1425 Bexpression
* binitializer
= initializer
->get_backend(&context
);
1427 gogo
->backend()->immutable_struct_set_init(this->type_descriptor_var_
,
1428 var_name
, false, is_common
,
1429 initializer_btype
, loc
,
1433 // Return true if this type descriptor is defined in a different
1434 // package. If this returns true it sets *PACKAGE to the package.
1437 Type::type_descriptor_defined_elsewhere(Named_type
* nt
,
1438 const Package
** package
)
1442 if (nt
->named_object()->package() != NULL
)
1444 // This is a named type defined in a different package. The
1445 // type descriptor should be defined in that package.
1446 *package
= nt
->named_object()->package();
1452 if (this->points_to() != NULL
1453 && this->points_to()->named_type() != NULL
1454 && this->points_to()->named_type()->named_object()->package() != NULL
)
1456 // This is an unnamed pointer to a named type defined in a
1457 // different package. The descriptor should be defined in
1459 *package
= this->points_to()->named_type()->named_object()->package();
1466 // Return a composite literal for a type descriptor.
1469 Type::type_descriptor(Gogo
* gogo
, Type
* type
)
1471 return type
->do_type_descriptor(gogo
, NULL
);
1474 // Return a composite literal for a type descriptor with a name.
1477 Type::named_type_descriptor(Gogo
* gogo
, Type
* type
, Named_type
* name
)
1479 go_assert(name
!= NULL
&& type
->named_type() != name
);
1480 return type
->do_type_descriptor(gogo
, name
);
1483 // Make a builtin struct type from a list of fields. The fields are
1484 // pairs of a name and a type.
1487 Type::make_builtin_struct_type(int nfields
, ...)
1490 va_start(ap
, nfields
);
1492 Location bloc
= Linemap::predeclared_location();
1493 Struct_field_list
* sfl
= new Struct_field_list();
1494 for (int i
= 0; i
< nfields
; i
++)
1496 const char* field_name
= va_arg(ap
, const char *);
1497 Type
* type
= va_arg(ap
, Type
*);
1498 sfl
->push_back(Struct_field(Typed_identifier(field_name
, type
, bloc
)));
1503 Struct_type
* ret
= Type::make_struct_type(sfl
, bloc
);
1504 ret
->set_is_struct_incomparable();
1508 // A list of builtin named types.
1510 std::vector
<Named_type
*> Type::named_builtin_types
;
1512 // Make a builtin named type.
1515 Type::make_builtin_named_type(const char* name
, Type
* type
)
1517 Location bloc
= Linemap::predeclared_location();
1518 Named_object
* no
= Named_object::make_type(name
, NULL
, type
, bloc
);
1519 Named_type
* ret
= no
->type_value();
1520 Type::named_builtin_types
.push_back(ret
);
1524 // Convert the named builtin types.
1527 Type::convert_builtin_named_types(Gogo
* gogo
)
1529 for (std::vector
<Named_type
*>::const_iterator p
=
1530 Type::named_builtin_types
.begin();
1531 p
!= Type::named_builtin_types
.end();
1534 bool r
= (*p
)->verify();
1536 (*p
)->convert(gogo
);
1540 // Return the type of a type descriptor. We should really tie this to
1541 // runtime.Type rather than copying it. This must match the struct "_type"
1542 // declared in libgo/go/runtime/type.go.
1545 Type::make_type_descriptor_type()
1550 Location bloc
= Linemap::predeclared_location();
1552 Type
* uint8_type
= Type::lookup_integer_type("uint8");
1553 Type
* pointer_uint8_type
= Type::make_pointer_type(uint8_type
);
1554 Type
* uint32_type
= Type::lookup_integer_type("uint32");
1555 Type
* uintptr_type
= Type::lookup_integer_type("uintptr");
1556 Type
* string_type
= Type::lookup_string_type();
1557 Type
* pointer_string_type
= Type::make_pointer_type(string_type
);
1559 // This is an unnamed version of unsafe.Pointer. Perhaps we
1560 // should use the named version instead, although that would
1561 // require us to create the unsafe package if it has not been
1562 // imported. It probably doesn't matter.
1563 Type
* void_type
= Type::make_void_type();
1564 Type
* unsafe_pointer_type
= Type::make_pointer_type(void_type
);
1566 Typed_identifier_list
*params
= new Typed_identifier_list();
1567 params
->push_back(Typed_identifier("key", unsafe_pointer_type
, bloc
));
1568 params
->push_back(Typed_identifier("seed", uintptr_type
, bloc
));
1570 Typed_identifier_list
* results
= new Typed_identifier_list();
1571 results
->push_back(Typed_identifier("", uintptr_type
, bloc
));
1573 Type
* hash_fntype
= Type::make_function_type(NULL
, params
, results
,
1576 params
= new Typed_identifier_list();
1577 params
->push_back(Typed_identifier("key1", unsafe_pointer_type
, bloc
));
1578 params
->push_back(Typed_identifier("key2", unsafe_pointer_type
, bloc
));
1580 results
= new Typed_identifier_list();
1581 results
->push_back(Typed_identifier("", Type::lookup_bool_type(), bloc
));
1583 Type
* equal_fntype
= Type::make_function_type(NULL
, params
, results
,
1586 // Forward declaration for the type descriptor type.
1587 Named_object
* named_type_descriptor_type
=
1588 Named_object::make_type_declaration("_type", NULL
, bloc
);
1589 Type
* ft
= Type::make_forward_declaration(named_type_descriptor_type
);
1590 Type
* pointer_type_descriptor_type
= Type::make_pointer_type(ft
);
1592 // The type of a method on a concrete type.
1593 Struct_type
* method_type
=
1594 Type::make_builtin_struct_type(5,
1595 "name", pointer_string_type
,
1596 "pkgPath", pointer_string_type
,
1597 "mtyp", pointer_type_descriptor_type
,
1598 "typ", pointer_type_descriptor_type
,
1599 "tfn", unsafe_pointer_type
);
1600 Named_type
* named_method_type
=
1601 Type::make_builtin_named_type("method", method_type
);
1603 // Information for types with a name or methods.
1604 Type
* slice_named_method_type
=
1605 Type::make_array_type(named_method_type
, NULL
);
1606 Struct_type
* uncommon_type
=
1607 Type::make_builtin_struct_type(3,
1608 "name", pointer_string_type
,
1609 "pkgPath", pointer_string_type
,
1610 "methods", slice_named_method_type
);
1611 Named_type
* named_uncommon_type
=
1612 Type::make_builtin_named_type("uncommonType", uncommon_type
);
1614 Type
* pointer_uncommon_type
=
1615 Type::make_pointer_type(named_uncommon_type
);
1617 // The type descriptor type.
1619 Struct_type
* type_descriptor_type
=
1620 Type::make_builtin_struct_type(12,
1621 "size", uintptr_type
,
1622 "ptrdata", uintptr_type
,
1623 "hash", uint32_type
,
1625 "align", uint8_type
,
1626 "fieldAlign", uint8_type
,
1627 "hashfn", hash_fntype
,
1628 "equalfn", equal_fntype
,
1629 "gcdata", pointer_uint8_type
,
1630 "string", pointer_string_type
,
1631 "", pointer_uncommon_type
,
1633 pointer_type_descriptor_type
);
1635 Named_type
* named
= Type::make_builtin_named_type("_type",
1636 type_descriptor_type
);
1638 named_type_descriptor_type
->set_type_value(named
);
1646 // Make the type of a pointer to a type descriptor as represented in
1650 Type::make_type_descriptor_ptr_type()
1654 ret
= Type::make_pointer_type(Type::make_type_descriptor_type());
1658 // Return the alignment required by the memequalN function. N is a
1659 // type size: 16, 32, 64, or 128. The memequalN functions are defined
1660 // in libgo/go/runtime/alg.go.
1663 Type::memequal_align(Gogo
* gogo
, int size
)
1678 // The code uses [2]int64, which must have the same alignment as
1686 Type
* t
= Type::lookup_integer_type(tn
);
1689 if (!t
->backend_type_align(gogo
, &ret
))
1694 // Return whether this type needs specially built type functions.
1695 // This returns true for types that are comparable and either can not
1696 // use an identity comparison, or are a non-standard size.
1699 Type::needs_specific_type_functions(Gogo
* gogo
)
1701 Named_type
* nt
= this->named_type();
1702 if (nt
!= NULL
&& nt
->is_alias())
1704 if (!this->is_comparable())
1706 if (!this->compare_is_identity(gogo
))
1709 // We create a few predeclared types for type descriptors; they are
1710 // really just for the backend and don't need hash or equality
1712 if (nt
!= NULL
&& Linemap::is_predeclared_location(nt
->location()))
1715 int64_t size
, align
;
1716 if (!this->backend_type_size(gogo
, &size
)
1717 || !this->backend_type_align(gogo
, &align
))
1719 go_assert(saw_errors());
1722 // This switch matches the one in Type::type_functions.
1728 return align
< Type::memequal_align(gogo
, 16);
1730 return align
< Type::memequal_align(gogo
, 32);
1732 return align
< Type::memequal_align(gogo
, 64);
1734 return align
< Type::memequal_align(gogo
, 128);
1740 // Set *HASH_FN and *EQUAL_FN to the runtime functions which compute a
1741 // hash code for this type and which compare whether two values of
1742 // this type are equal. If NAME is not NULL it is the name of this
1743 // type. HASH_FNTYPE and EQUAL_FNTYPE are the types of these
1744 // functions, for convenience; they may be NULL.
1747 Type::type_functions(Gogo
* gogo
, Named_type
* name
, Function_type
* hash_fntype
,
1748 Function_type
* equal_fntype
, Named_object
** hash_fn
,
1749 Named_object
** equal_fn
)
1751 // If the unaliased type is not a named type, then the type does not
1752 // have a name after all.
1754 name
= name
->unalias()->named_type();
1756 if (!this->is_comparable())
1763 if (hash_fntype
== NULL
|| equal_fntype
== NULL
)
1765 Location bloc
= Linemap::predeclared_location();
1767 Type
* uintptr_type
= Type::lookup_integer_type("uintptr");
1768 Type
* void_type
= Type::make_void_type();
1769 Type
* unsafe_pointer_type
= Type::make_pointer_type(void_type
);
1771 if (hash_fntype
== NULL
)
1773 Typed_identifier_list
* params
= new Typed_identifier_list();
1774 params
->push_back(Typed_identifier("key", unsafe_pointer_type
,
1776 params
->push_back(Typed_identifier("seed", uintptr_type
, bloc
));
1778 Typed_identifier_list
* results
= new Typed_identifier_list();
1779 results
->push_back(Typed_identifier("", uintptr_type
, bloc
));
1781 hash_fntype
= Type::make_function_type(NULL
, params
, results
, bloc
);
1783 if (equal_fntype
== NULL
)
1785 Typed_identifier_list
* params
= new Typed_identifier_list();
1786 params
->push_back(Typed_identifier("key1", unsafe_pointer_type
,
1788 params
->push_back(Typed_identifier("key2", unsafe_pointer_type
,
1791 Typed_identifier_list
* results
= new Typed_identifier_list();
1792 results
->push_back(Typed_identifier("", Type::lookup_bool_type(),
1795 equal_fntype
= Type::make_function_type(NULL
, params
, results
, bloc
);
1799 const char* hash_fnname
;
1800 const char* equal_fnname
;
1801 if (this->compare_is_identity(gogo
))
1803 int64_t size
, align
;
1804 if (!this->backend_type_size(gogo
, &size
)
1805 || !this->backend_type_align(gogo
, &align
))
1807 go_assert(saw_errors());
1810 bool build_functions
= false;
1811 // This switch matches the one in Type::needs_specific_type_functions.
1812 // The alignment tests are because of the memequal functions,
1813 // which assume that the values are aligned as required for an
1814 // integer of that size.
1818 hash_fnname
= "runtime.memhash0";
1819 equal_fnname
= "runtime.memequal0";
1822 hash_fnname
= "runtime.memhash8";
1823 equal_fnname
= "runtime.memequal8";
1826 if (align
< Type::memequal_align(gogo
, 16))
1827 build_functions
= true;
1830 hash_fnname
= "runtime.memhash16";
1831 equal_fnname
= "runtime.memequal16";
1835 if (align
< Type::memequal_align(gogo
, 32))
1836 build_functions
= true;
1839 hash_fnname
= "runtime.memhash32";
1840 equal_fnname
= "runtime.memequal32";
1844 if (align
< Type::memequal_align(gogo
, 64))
1845 build_functions
= true;
1848 hash_fnname
= "runtime.memhash64";
1849 equal_fnname
= "runtime.memequal64";
1853 if (align
< Type::memequal_align(gogo
, 128))
1854 build_functions
= true;
1857 hash_fnname
= "runtime.memhash128";
1858 equal_fnname
= "runtime.memequal128";
1862 build_functions
= true;
1865 if (build_functions
)
1867 // We don't have a built-in function for a type of this size
1868 // and alignment. Build a function to use that calls the
1869 // generic hash/equality functions for identity, passing the size.
1870 this->specific_type_functions(gogo
, name
, size
, hash_fntype
,
1871 equal_fntype
, hash_fn
, equal_fn
);
1877 switch (this->base()->classification())
1879 case Type::TYPE_ERROR
:
1880 case Type::TYPE_VOID
:
1881 case Type::TYPE_NIL
:
1882 case Type::TYPE_FUNCTION
:
1883 case Type::TYPE_MAP
:
1884 // For these types is_comparable should have returned false.
1887 case Type::TYPE_BOOLEAN
:
1888 case Type::TYPE_INTEGER
:
1889 case Type::TYPE_POINTER
:
1890 case Type::TYPE_CHANNEL
:
1891 // For these types compare_is_identity should have returned true.
1894 case Type::TYPE_FLOAT
:
1895 switch (this->float_type()->bits())
1898 hash_fnname
= "runtime.f32hash";
1899 equal_fnname
= "runtime.f32equal";
1902 hash_fnname
= "runtime.f64hash";
1903 equal_fnname
= "runtime.f64equal";
1910 case Type::TYPE_COMPLEX
:
1911 switch (this->complex_type()->bits())
1914 hash_fnname
= "runtime.c64hash";
1915 equal_fnname
= "runtime.c64equal";
1918 hash_fnname
= "runtime.c128hash";
1919 equal_fnname
= "runtime.c128equal";
1926 case Type::TYPE_STRING
:
1927 hash_fnname
= "runtime.strhash";
1928 equal_fnname
= "runtime.strequal";
1931 case Type::TYPE_STRUCT
:
1933 // This is a struct which can not be compared using a
1934 // simple identity function. We need to build a function
1936 this->specific_type_functions(gogo
, name
, -1, hash_fntype
,
1937 equal_fntype
, hash_fn
, equal_fn
);
1941 case Type::TYPE_ARRAY
:
1942 if (this->is_slice_type())
1944 // Type::is_compatible_for_comparison should have
1950 // This is an array which can not be compared using a
1951 // simple identity function. We need to build a
1952 // function for comparison.
1953 this->specific_type_functions(gogo
, name
, -1, hash_fntype
,
1954 equal_fntype
, hash_fn
, equal_fn
);
1959 case Type::TYPE_INTERFACE
:
1960 if (this->interface_type()->is_empty())
1962 hash_fnname
= "runtime.nilinterhash";
1963 equal_fnname
= "runtime.nilinterequal";
1967 hash_fnname
= "runtime.interhash";
1968 equal_fnname
= "runtime.interequal";
1972 case Type::TYPE_NAMED
:
1973 case Type::TYPE_FORWARD
:
1982 Location bloc
= Linemap::predeclared_location();
1983 *hash_fn
= Named_object::make_function_declaration(hash_fnname
, NULL
,
1985 (*hash_fn
)->func_declaration_value()->set_asm_name(hash_fnname
);
1986 *equal_fn
= Named_object::make_function_declaration(equal_fnname
, NULL
,
1987 equal_fntype
, bloc
);
1988 (*equal_fn
)->func_declaration_value()->set_asm_name(equal_fnname
);
1991 // A hash table mapping types to the specific hash functions.
1993 Type::Type_functions
Type::type_functions_table
;
1995 // Handle a type function which is specific to a type: if SIZE == -1,
1996 // this is a struct or array that can not use an identity comparison.
1997 // Otherwise, it is a type that uses an identity comparison but is not
1998 // one of the standard supported sizes.
2001 Type::specific_type_functions(Gogo
* gogo
, Named_type
* name
, int64_t size
,
2002 Function_type
* hash_fntype
,
2003 Function_type
* equal_fntype
,
2004 Named_object
** hash_fn
,
2005 Named_object
** equal_fn
)
2007 Hash_equal_fn
fnull(NULL
, NULL
);
2008 std::pair
<Type
*, Hash_equal_fn
> val(name
!= NULL
? name
: this, fnull
);
2009 std::pair
<Type_functions::iterator
, bool> ins
=
2010 Type::type_functions_table
.insert(val
);
2013 // We already have functions for this type
2014 *hash_fn
= ins
.first
->second
.first
;
2015 *equal_fn
= ins
.first
->second
.second
;
2019 std::string hash_name
;
2020 std::string equal_name
;
2021 gogo
->specific_type_function_names(this, name
, &hash_name
, &equal_name
);
2023 Location bloc
= Linemap::predeclared_location();
2025 const Package
* package
= NULL
;
2026 bool is_defined_elsewhere
=
2027 this->type_descriptor_defined_elsewhere(name
, &package
);
2028 if (is_defined_elsewhere
)
2030 *hash_fn
= Named_object::make_function_declaration(hash_name
, package
,
2032 *equal_fn
= Named_object::make_function_declaration(equal_name
, package
,
2033 equal_fntype
, bloc
);
2037 *hash_fn
= gogo
->declare_package_function(hash_name
, hash_fntype
, bloc
);
2038 *equal_fn
= gogo
->declare_package_function(equal_name
, equal_fntype
,
2042 ins
.first
->second
.first
= *hash_fn
;
2043 ins
.first
->second
.second
= *equal_fn
;
2045 if (!is_defined_elsewhere
)
2047 if (gogo
->in_global_scope())
2048 this->write_specific_type_functions(gogo
, name
, size
, hash_name
,
2049 hash_fntype
, equal_name
,
2052 gogo
->queue_specific_type_function(this, name
, size
, hash_name
,
2053 hash_fntype
, equal_name
,
2058 // Write the hash and equality functions for a type which needs to be
2059 // written specially.
2062 Type::write_specific_type_functions(Gogo
* gogo
, Named_type
* name
, int64_t size
,
2063 const std::string
& hash_name
,
2064 Function_type
* hash_fntype
,
2065 const std::string
& equal_name
,
2066 Function_type
* equal_fntype
)
2068 Location bloc
= Linemap::predeclared_location();
2070 if (gogo
->specific_type_functions_are_written())
2072 go_assert(saw_errors());
2076 go_assert(this->is_comparable());
2078 Named_object
* hash_fn
= gogo
->start_function(hash_name
, hash_fntype
, false,
2080 hash_fn
->func_value()->set_is_type_specific_function();
2081 gogo
->start_block(bloc
);
2084 this->write_identity_hash(gogo
, size
);
2085 else if (name
!= NULL
&& name
->real_type()->named_type() != NULL
)
2086 this->write_named_hash(gogo
, name
, hash_fntype
, equal_fntype
);
2087 else if (this->struct_type() != NULL
)
2088 this->struct_type()->write_hash_function(gogo
, name
, hash_fntype
,
2090 else if (this->array_type() != NULL
)
2091 this->array_type()->write_hash_function(gogo
, name
, hash_fntype
,
2096 Block
* b
= gogo
->finish_block(bloc
);
2097 gogo
->add_block(b
, bloc
);
2098 gogo
->lower_block(hash_fn
, b
);
2099 gogo
->finish_function(bloc
);
2101 Named_object
*equal_fn
= gogo
->start_function(equal_name
, equal_fntype
,
2103 equal_fn
->func_value()->set_is_type_specific_function();
2104 gogo
->start_block(bloc
);
2107 this->write_identity_equal(gogo
, size
);
2108 else if (name
!= NULL
&& name
->real_type()->named_type() != NULL
)
2109 this->write_named_equal(gogo
, name
);
2110 else if (this->struct_type() != NULL
)
2111 this->struct_type()->write_equal_function(gogo
, name
);
2112 else if (this->array_type() != NULL
)
2113 this->array_type()->write_equal_function(gogo
, name
);
2117 b
= gogo
->finish_block(bloc
);
2118 gogo
->add_block(b
, bloc
);
2119 gogo
->lower_block(equal_fn
, b
);
2120 gogo
->finish_function(bloc
);
2122 // Build the function descriptors for the type descriptor to refer to.
2123 hash_fn
->func_value()->descriptor(gogo
, hash_fn
);
2124 equal_fn
->func_value()->descriptor(gogo
, equal_fn
);
2127 // Write a hash function for a type that can use an identity hash but
2128 // is not one of the standard supported sizes. For example, this
2129 // would be used for the type [3]byte. This builds a return statement
2130 // that returns a call to the memhash function, passing the key and
2131 // seed from the function arguments (already constructed before this
2132 // is called), and the constant size.
2135 Type::write_identity_hash(Gogo
* gogo
, int64_t size
)
2137 Location bloc
= Linemap::predeclared_location();
2139 Type
* unsafe_pointer_type
= Type::make_pointer_type(Type::make_void_type());
2140 Type
* uintptr_type
= Type::lookup_integer_type("uintptr");
2142 Typed_identifier_list
* params
= new Typed_identifier_list();
2143 params
->push_back(Typed_identifier("key", unsafe_pointer_type
, bloc
));
2144 params
->push_back(Typed_identifier("seed", uintptr_type
, bloc
));
2145 params
->push_back(Typed_identifier("size", uintptr_type
, bloc
));
2147 Typed_identifier_list
* results
= new Typed_identifier_list();
2148 results
->push_back(Typed_identifier("", uintptr_type
, bloc
));
2150 Function_type
* memhash_fntype
= Type::make_function_type(NULL
, params
,
2153 Named_object
* memhash
=
2154 Named_object::make_function_declaration("runtime.memhash", NULL
,
2155 memhash_fntype
, bloc
);
2156 memhash
->func_declaration_value()->set_asm_name("runtime.memhash");
2158 Named_object
* key_arg
= gogo
->lookup("key", NULL
);
2159 go_assert(key_arg
!= NULL
);
2160 Named_object
* seed_arg
= gogo
->lookup("seed", NULL
);
2161 go_assert(seed_arg
!= NULL
);
2163 Expression
* key_ref
= Expression::make_var_reference(key_arg
, bloc
);
2164 Expression
* seed_ref
= Expression::make_var_reference(seed_arg
, bloc
);
2165 Expression
* size_arg
= Expression::make_integer_int64(size
, uintptr_type
,
2167 Expression_list
* args
= new Expression_list();
2168 args
->push_back(key_ref
);
2169 args
->push_back(seed_ref
);
2170 args
->push_back(size_arg
);
2171 Expression
* func
= Expression::make_func_reference(memhash
, NULL
, bloc
);
2172 Expression
* call
= Expression::make_call(func
, args
, false, bloc
);
2174 Expression_list
* vals
= new Expression_list();
2175 vals
->push_back(call
);
2176 Statement
* s
= Statement::make_return_statement(vals
, bloc
);
2177 gogo
->add_statement(s
);
2180 // Write an equality function for a type that can use an identity
2181 // equality comparison but is not one of the standard supported sizes.
2182 // For example, this would be used for the type [3]byte. This builds
2183 // a return statement that returns a call to the memequal function,
2184 // passing the two keys from the function arguments (already
2185 // constructed before this is called), and the constant size.
2188 Type::write_identity_equal(Gogo
* gogo
, int64_t size
)
2190 Location bloc
= Linemap::predeclared_location();
2192 Type
* unsafe_pointer_type
= Type::make_pointer_type(Type::make_void_type());
2193 Type
* uintptr_type
= Type::lookup_integer_type("uintptr");
2195 Typed_identifier_list
* params
= new Typed_identifier_list();
2196 params
->push_back(Typed_identifier("key1", unsafe_pointer_type
, bloc
));
2197 params
->push_back(Typed_identifier("key2", unsafe_pointer_type
, bloc
));
2198 params
->push_back(Typed_identifier("size", uintptr_type
, bloc
));
2200 Typed_identifier_list
* results
= new Typed_identifier_list();
2201 results
->push_back(Typed_identifier("", Type::lookup_bool_type(), bloc
));
2203 Function_type
* memequal_fntype
= Type::make_function_type(NULL
, params
,
2206 Named_object
* memequal
=
2207 Named_object::make_function_declaration("runtime.memequal", NULL
,
2208 memequal_fntype
, bloc
);
2209 memequal
->func_declaration_value()->set_asm_name("runtime.memequal");
2211 Named_object
* key1_arg
= gogo
->lookup("key1", NULL
);
2212 go_assert(key1_arg
!= NULL
);
2213 Named_object
* key2_arg
= gogo
->lookup("key2", NULL
);
2214 go_assert(key2_arg
!= NULL
);
2216 Expression
* key1_ref
= Expression::make_var_reference(key1_arg
, bloc
);
2217 Expression
* key2_ref
= Expression::make_var_reference(key2_arg
, bloc
);
2218 Expression
* size_arg
= Expression::make_integer_int64(size
, uintptr_type
,
2220 Expression_list
* args
= new Expression_list();
2221 args
->push_back(key1_ref
);
2222 args
->push_back(key2_ref
);
2223 args
->push_back(size_arg
);
2224 Expression
* func
= Expression::make_func_reference(memequal
, NULL
, bloc
);
2225 Expression
* call
= Expression::make_call(func
, args
, false, bloc
);
2227 Expression_list
* vals
= new Expression_list();
2228 vals
->push_back(call
);
2229 Statement
* s
= Statement::make_return_statement(vals
, bloc
);
2230 gogo
->add_statement(s
);
2233 // Write a hash function that simply calls the hash function for a
2234 // named type. This is used when one named type is defined as
2235 // another. This ensures that this case works when the other named
2236 // type is defined in another package and relies on calling hash
2237 // functions defined only in that package.
2240 Type::write_named_hash(Gogo
* gogo
, Named_type
* name
,
2241 Function_type
* hash_fntype
, Function_type
* equal_fntype
)
2243 Location bloc
= Linemap::predeclared_location();
2245 Named_type
* base_type
= name
->real_type()->named_type();
2246 while (base_type
->is_alias())
2248 base_type
= base_type
->real_type()->named_type();
2249 go_assert(base_type
!= NULL
);
2251 go_assert(base_type
!= NULL
);
2253 // The pointer to the type we are going to hash. This is an
2255 Named_object
* key_arg
= gogo
->lookup("key", NULL
);
2256 go_assert(key_arg
!= NULL
);
2258 // The seed argument to the hash function.
2259 Named_object
* seed_arg
= gogo
->lookup("seed", NULL
);
2260 go_assert(seed_arg
!= NULL
);
2262 Named_object
* hash_fn
;
2263 Named_object
* equal_fn
;
2264 name
->real_type()->type_functions(gogo
, base_type
, hash_fntype
, equal_fntype
,
2265 &hash_fn
, &equal_fn
);
2267 // Call the hash function for the base type.
2268 Expression
* key_ref
= Expression::make_var_reference(key_arg
, bloc
);
2269 Expression
* seed_ref
= Expression::make_var_reference(seed_arg
, bloc
);
2270 Expression_list
* args
= new Expression_list();
2271 args
->push_back(key_ref
);
2272 args
->push_back(seed_ref
);
2273 Expression
* func
= Expression::make_func_reference(hash_fn
, NULL
, bloc
);
2274 Expression
* call
= Expression::make_call(func
, args
, false, bloc
);
2276 // Return the hash of the base type.
2277 Expression_list
* vals
= new Expression_list();
2278 vals
->push_back(call
);
2279 Statement
* s
= Statement::make_return_statement(vals
, bloc
);
2280 gogo
->add_statement(s
);
2283 // Write an equality function that simply calls the equality function
2284 // for a named type. This is used when one named type is defined as
2285 // another. This ensures that this case works when the other named
2286 // type is defined in another package and relies on calling equality
2287 // functions defined only in that package.
2290 Type::write_named_equal(Gogo
* gogo
, Named_type
* name
)
2292 Location bloc
= Linemap::predeclared_location();
2294 // The pointers to the types we are going to compare. These have
2295 // type unsafe.Pointer.
2296 Named_object
* key1_arg
= gogo
->lookup("key1", NULL
);
2297 Named_object
* key2_arg
= gogo
->lookup("key2", NULL
);
2298 go_assert(key1_arg
!= NULL
&& key2_arg
!= NULL
);
2300 Named_type
* base_type
= name
->real_type()->named_type();
2301 go_assert(base_type
!= NULL
);
2303 // Build temporaries with the base type.
2304 Type
* pt
= Type::make_pointer_type(base_type
);
2306 Expression
* ref
= Expression::make_var_reference(key1_arg
, bloc
);
2307 ref
= Expression::make_cast(pt
, ref
, bloc
);
2308 Temporary_statement
* p1
= Statement::make_temporary(pt
, ref
, bloc
);
2309 gogo
->add_statement(p1
);
2311 ref
= Expression::make_var_reference(key2_arg
, bloc
);
2312 ref
= Expression::make_cast(pt
, ref
, bloc
);
2313 Temporary_statement
* p2
= Statement::make_temporary(pt
, ref
, bloc
);
2314 gogo
->add_statement(p2
);
2316 // Compare the values for equality.
2317 Expression
* t1
= Expression::make_temporary_reference(p1
, bloc
);
2318 t1
= Expression::make_dereference(t1
, Expression::NIL_CHECK_NOT_NEEDED
, bloc
);
2320 Expression
* t2
= Expression::make_temporary_reference(p2
, bloc
);
2321 t2
= Expression::make_dereference(t2
, Expression::NIL_CHECK_NOT_NEEDED
, bloc
);
2323 Expression
* cond
= Expression::make_binary(OPERATOR_EQEQ
, t1
, t2
, bloc
);
2325 // Return the equality comparison.
2326 Expression_list
* vals
= new Expression_list();
2327 vals
->push_back(cond
);
2328 Statement
* s
= Statement::make_return_statement(vals
, bloc
);
2329 gogo
->add_statement(s
);
2332 // Return a composite literal for the type descriptor for a plain type
2333 // of kind RUNTIME_TYPE_KIND named NAME.
2336 Type::type_descriptor_constructor(Gogo
* gogo
, int runtime_type_kind
,
2337 Named_type
* name
, const Methods
* methods
,
2338 bool only_value_methods
)
2340 Location bloc
= Linemap::predeclared_location();
2342 Type
* td_type
= Type::make_type_descriptor_type();
2343 const Struct_field_list
* fields
= td_type
->struct_type()->fields();
2345 Expression_list
* vals
= new Expression_list();
2348 if (!this->has_pointer())
2349 runtime_type_kind
|= RUNTIME_TYPE_KIND_NO_POINTERS
;
2350 if (this->points_to() != NULL
)
2351 runtime_type_kind
|= RUNTIME_TYPE_KIND_DIRECT_IFACE
;
2354 if (this->needs_gcprog(gogo
, &ptrsize
, &ptrdata
))
2355 runtime_type_kind
|= RUNTIME_TYPE_KIND_GC_PROG
;
2357 Struct_field_list::const_iterator p
= fields
->begin();
2358 go_assert(p
->is_field_name("size"));
2359 Expression::Type_info type_info
= Expression::TYPE_INFO_SIZE
;
2360 vals
->push_back(Expression::make_type_info(this, type_info
));
2363 go_assert(p
->is_field_name("ptrdata"));
2364 type_info
= Expression::TYPE_INFO_DESCRIPTOR_PTRDATA
;
2365 vals
->push_back(Expression::make_type_info(this, type_info
));
2368 go_assert(p
->is_field_name("hash"));
2371 h
= name
->hash_for_method(gogo
);
2373 h
= this->hash_for_method(gogo
);
2374 vals
->push_back(Expression::make_integer_ul(h
, p
->type(), bloc
));
2377 go_assert(p
->is_field_name("kind"));
2378 vals
->push_back(Expression::make_integer_ul(runtime_type_kind
, p
->type(),
2382 go_assert(p
->is_field_name("align"));
2383 type_info
= Expression::TYPE_INFO_ALIGNMENT
;
2384 vals
->push_back(Expression::make_type_info(this, type_info
));
2387 go_assert(p
->is_field_name("fieldAlign"));
2388 type_info
= Expression::TYPE_INFO_FIELD_ALIGNMENT
;
2389 vals
->push_back(Expression::make_type_info(this, type_info
));
2392 go_assert(p
->is_field_name("hashfn"));
2393 Function_type
* hash_fntype
= p
->type()->function_type();
2396 go_assert(p
->is_field_name("equalfn"));
2397 Function_type
* equal_fntype
= p
->type()->function_type();
2399 Named_object
* hash_fn
;
2400 Named_object
* equal_fn
;
2401 this->type_functions(gogo
, name
, hash_fntype
, equal_fntype
, &hash_fn
,
2403 if (hash_fn
== NULL
)
2404 vals
->push_back(Expression::make_cast(hash_fntype
,
2405 Expression::make_nil(bloc
),
2408 vals
->push_back(Expression::make_func_reference(hash_fn
, NULL
, bloc
));
2409 if (equal_fn
== NULL
)
2410 vals
->push_back(Expression::make_cast(equal_fntype
,
2411 Expression::make_nil(bloc
),
2414 vals
->push_back(Expression::make_func_reference(equal_fn
, NULL
, bloc
));
2417 go_assert(p
->is_field_name("gcdata"));
2418 vals
->push_back(Expression::make_gc_symbol(this));
2421 go_assert(p
->is_field_name("string"));
2422 Expression
* s
= Expression::make_string((name
!= NULL
2423 ? name
->reflection(gogo
)
2424 : this->reflection(gogo
)),
2426 vals
->push_back(Expression::make_unary(OPERATOR_AND
, s
, bloc
));
2429 go_assert(p
->is_field_name("uncommonType"));
2430 if (name
== NULL
&& methods
== NULL
)
2431 vals
->push_back(Expression::make_nil(bloc
));
2434 if (methods
== NULL
)
2435 methods
= name
->methods();
2436 vals
->push_back(this->uncommon_type_constructor(gogo
,
2439 only_value_methods
));
2443 go_assert(p
->is_field_name("ptrToThis"));
2444 if (name
== NULL
&& methods
== NULL
)
2445 vals
->push_back(Expression::make_nil(bloc
));
2450 pt
= Type::make_pointer_type(name
);
2452 pt
= Type::make_pointer_type(this);
2453 vals
->push_back(Expression::make_type_descriptor(pt
, bloc
));
2457 go_assert(p
== fields
->end());
2459 return Expression::make_struct_composite_literal(td_type
, vals
, bloc
);
2462 // The maximum length of a GC ptrmask bitmap. This corresponds to the
2463 // length used by the gc toolchain, and also appears in
2464 // libgo/go/reflect/type.go.
2466 static const int64_t max_ptrmask_bytes
= 2048;
2468 // Return a pointer to the Garbage Collection information for this type.
2471 Type::gc_symbol_pointer(Gogo
* gogo
)
2473 Type
* t
= this->unalias();
2475 if (!t
->has_pointer())
2476 return gogo
->backend()->nil_pointer_expression();
2478 if (t
->gc_symbol_var_
== NULL
)
2480 t
->make_gc_symbol_var(gogo
);
2481 go_assert(t
->gc_symbol_var_
!= NULL
);
2483 Location bloc
= Linemap::predeclared_location();
2484 Bexpression
* var_expr
=
2485 gogo
->backend()->var_expression(t
->gc_symbol_var_
, bloc
);
2486 Bexpression
* addr_expr
=
2487 gogo
->backend()->address_expression(var_expr
, bloc
);
2489 Type
* uint8_type
= Type::lookup_integer_type("uint8");
2490 Type
* pointer_uint8_type
= Type::make_pointer_type(uint8_type
);
2491 Btype
* ubtype
= pointer_uint8_type
->get_backend(gogo
);
2492 return gogo
->backend()->convert_expression(ubtype
, addr_expr
, bloc
);
2495 // A mapping from unnamed types to GC symbol variables.
2497 Type::GC_symbol_vars
Type::gc_symbol_vars
;
2499 // Build the GC symbol for this type.
2502 Type::make_gc_symbol_var(Gogo
* gogo
)
2504 go_assert(this->gc_symbol_var_
== NULL
);
2506 Named_type
* nt
= this->named_type();
2508 // We can have multiple instances of unnamed types and similar to type
2509 // descriptors, we only want to the emit the GC data once, so we use a
2511 Bvariable
** phash
= NULL
;
2514 Bvariable
* bvnull
= NULL
;
2515 std::pair
<GC_symbol_vars::iterator
, bool> ins
=
2516 Type::gc_symbol_vars
.insert(std::make_pair(this, bvnull
));
2519 // We've already built a gc symbol for this type.
2520 this->gc_symbol_var_
= ins
.first
->second
;
2523 phash
= &ins
.first
->second
;
2528 if (!this->needs_gcprog(gogo
, &ptrsize
, &ptrdata
))
2530 this->gc_symbol_var_
= this->gc_ptrmask_var(gogo
, ptrsize
, ptrdata
);
2532 *phash
= this->gc_symbol_var_
;
2536 std::string sym_name
= gogo
->gc_symbol_name(this);
2538 // Build the contents of the gc symbol.
2539 Expression
* sym_init
= this->gcprog_constructor(gogo
, ptrsize
, ptrdata
);
2540 Btype
* sym_btype
= sym_init
->type()->get_backend(gogo
);
2542 // If the type descriptor for this type is defined somewhere else, so is the
2544 const Package
* dummy
;
2545 if (this->type_descriptor_defined_elsewhere(nt
, &dummy
))
2547 std::string
asm_name(go_selectively_encode_id(sym_name
));
2548 this->gc_symbol_var_
=
2549 gogo
->backend()->implicit_variable_reference(sym_name
, asm_name
,
2552 *phash
= this->gc_symbol_var_
;
2556 // See if this gc symbol can appear in multiple packages.
2557 bool is_common
= false;
2560 // We create the symbol for a builtin type whenever we need
2562 is_common
= nt
->is_builtin();
2566 // This is an unnamed type. The descriptor could be defined in
2567 // any package where it is needed, and the linker will pick one
2568 // descriptor to keep.
2572 // Since we are building the GC symbol in this package, we must create the
2573 // variable before converting the initializer to its backend representation
2574 // because the initializer may refer to the GC symbol for this type.
2575 std::string
asm_name(go_selectively_encode_id(sym_name
));
2576 this->gc_symbol_var_
=
2577 gogo
->backend()->implicit_variable(sym_name
, asm_name
,
2578 sym_btype
, false, true, is_common
, 0);
2580 *phash
= this->gc_symbol_var_
;
2582 Translate_context
context(gogo
, NULL
, NULL
, NULL
);
2583 context
.set_is_const();
2584 Bexpression
* sym_binit
= sym_init
->get_backend(&context
);
2585 gogo
->backend()->implicit_variable_set_init(this->gc_symbol_var_
, sym_name
,
2586 sym_btype
, false, true, is_common
,
2590 // Return whether this type needs a GC program, and set *PTRDATA to
2591 // the size of the pointer data in bytes and *PTRSIZE to the size of a
2595 Type::needs_gcprog(Gogo
* gogo
, int64_t* ptrsize
, int64_t* ptrdata
)
2597 Type
* voidptr
= Type::make_pointer_type(Type::make_void_type());
2598 if (!voidptr
->backend_type_size(gogo
, ptrsize
))
2601 if (!this->backend_type_ptrdata(gogo
, ptrdata
))
2603 go_assert(saw_errors());
2607 return *ptrdata
/ *ptrsize
> max_ptrmask_bytes
;
2610 // A simple class used to build a GC ptrmask for a type.
2615 Ptrmask(size_t count
)
2616 : bits_((count
+ 7) / 8, 0)
2620 set_from(Gogo
*, Type
*, int64_t ptrsize
, int64_t offset
);
2626 constructor(Gogo
* gogo
) const;
2631 { this->bits_
.at(index
/ 8) |= 1 << (index
% 8); }
2634 std::vector
<unsigned char> bits_
;
2637 // Set bits in ptrmask starting from OFFSET based on TYPE. OFFSET
2638 // counts in bytes. PTRSIZE is the size of a pointer on the target
2642 Ptrmask::set_from(Gogo
* gogo
, Type
* type
, int64_t ptrsize
, int64_t offset
)
2644 switch (type
->base()->classification())
2647 case Type::TYPE_NIL
:
2648 case Type::TYPE_CALL_MULTIPLE_RESULT
:
2649 case Type::TYPE_NAMED
:
2650 case Type::TYPE_FORWARD
:
2653 case Type::TYPE_ERROR
:
2654 case Type::TYPE_VOID
:
2655 case Type::TYPE_BOOLEAN
:
2656 case Type::TYPE_INTEGER
:
2657 case Type::TYPE_FLOAT
:
2658 case Type::TYPE_COMPLEX
:
2659 case Type::TYPE_SINK
:
2662 case Type::TYPE_FUNCTION
:
2663 case Type::TYPE_POINTER
:
2664 case Type::TYPE_MAP
:
2665 case Type::TYPE_CHANNEL
:
2666 // These types are all a single pointer.
2667 go_assert((offset
% ptrsize
) == 0);
2668 this->set(offset
/ ptrsize
);
2671 case Type::TYPE_STRING
:
2672 // A string starts with a single pointer.
2673 go_assert((offset
% ptrsize
) == 0);
2674 this->set(offset
/ ptrsize
);
2677 case Type::TYPE_INTERFACE
:
2678 // An interface is two pointers.
2679 go_assert((offset
% ptrsize
) == 0);
2680 this->set(offset
/ ptrsize
);
2681 this->set((offset
/ ptrsize
) + 1);
2684 case Type::TYPE_STRUCT
:
2686 if (!type
->has_pointer())
2689 const Struct_field_list
* fields
= type
->struct_type()->fields();
2690 int64_t soffset
= 0;
2691 for (Struct_field_list::const_iterator pf
= fields
->begin();
2692 pf
!= fields
->end();
2695 int64_t field_align
;
2696 if (!pf
->type()->backend_type_field_align(gogo
, &field_align
))
2698 go_assert(saw_errors());
2701 soffset
= (soffset
+ (field_align
- 1)) &~ (field_align
- 1);
2703 this->set_from(gogo
, pf
->type(), ptrsize
, offset
+ soffset
);
2706 if (!pf
->type()->backend_type_size(gogo
, &field_size
))
2708 go_assert(saw_errors());
2711 soffset
+= field_size
;
2716 case Type::TYPE_ARRAY
:
2717 if (type
->is_slice_type())
2719 // A slice starts with a single pointer.
2720 go_assert((offset
% ptrsize
) == 0);
2721 this->set(offset
/ ptrsize
);
2726 if (!type
->has_pointer())
2730 if (!type
->array_type()->int_length(&len
))
2732 go_assert(saw_errors());
2736 Type
* element_type
= type
->array_type()->element_type();
2738 if (!element_type
->backend_type_size(gogo
, &ele_size
))
2740 go_assert(saw_errors());
2744 int64_t eoffset
= 0;
2745 for (int64_t i
= 0; i
< len
; i
++, eoffset
+= ele_size
)
2746 this->set_from(gogo
, element_type
, ptrsize
, offset
+ eoffset
);
2752 // Return a symbol name for this ptrmask. This is used to coalesce
2753 // identical ptrmasks, which are common. The symbol name must use
2754 // only characters that are valid in symbols. It's nice if it's
2755 // short. We convert it to a string that uses only 32 characters,
2756 // avoiding digits and u and U.
2759 Ptrmask::symname() const
2761 const char chars
[33] = "abcdefghijklmnopqrstvwxyzABCDEFG";
2762 go_assert(chars
[32] == '\0');
2766 for (std::vector
<unsigned char>::const_iterator p
= this->bits_
.begin();
2767 p
!= this->bits_
.end();
2770 b
|= *p
<< remaining
;
2772 while (remaining
>= 5)
2774 ret
+= chars
[b
& 0x1f];
2779 while (remaining
> 0)
2781 ret
+= chars
[b
& 0x1f];
2788 // Return a constructor for this ptrmask. This will be used to
2789 // initialize the runtime ptrmask value.
2792 Ptrmask::constructor(Gogo
* gogo
) const
2794 Location bloc
= Linemap::predeclared_location();
2795 Type
* byte_type
= gogo
->lookup_global("byte")->type_value();
2796 Expression
* len
= Expression::make_integer_ul(this->bits_
.size(), NULL
,
2798 Array_type
* at
= Type::make_array_type(byte_type
, len
);
2799 Expression_list
* vals
= new Expression_list();
2800 vals
->reserve(this->bits_
.size());
2801 for (std::vector
<unsigned char>::const_iterator p
= this->bits_
.begin();
2802 p
!= this->bits_
.end();
2804 vals
->push_back(Expression::make_integer_ul(*p
, byte_type
, bloc
));
2805 return Expression::make_array_composite_literal(at
, vals
, bloc
);
2808 // The hash table mapping a ptrmask symbol name to the ptrmask variable.
2809 Type::GC_gcbits_vars
Type::gc_gcbits_vars
;
2811 // Return a ptrmask variable for a type. For a type descriptor this
2812 // is only used for variables that are small enough to not need a
2813 // gcprog, but for a global variable this is used for a variable of
2814 // any size. PTRDATA is the number of bytes of the type that contain
2815 // pointer data. PTRSIZE is the size of a pointer on the target
2819 Type::gc_ptrmask_var(Gogo
* gogo
, int64_t ptrsize
, int64_t ptrdata
)
2821 Ptrmask
ptrmask(ptrdata
/ ptrsize
);
2822 if (ptrdata
>= ptrsize
)
2823 ptrmask
.set_from(gogo
, this, ptrsize
, 0);
2826 // This can happen in error cases. Just build an empty gcbits.
2827 go_assert(saw_errors());
2830 std::string sym_name
= gogo
->ptrmask_symbol_name(ptrmask
.symname());
2831 Bvariable
* bvnull
= NULL
;
2832 std::pair
<GC_gcbits_vars::iterator
, bool> ins
=
2833 Type::gc_gcbits_vars
.insert(std::make_pair(sym_name
, bvnull
));
2836 // We've already built a GC symbol for this set of gcbits.
2837 return ins
.first
->second
;
2840 Expression
* val
= ptrmask
.constructor(gogo
);
2841 Translate_context
context(gogo
, NULL
, NULL
, NULL
);
2842 context
.set_is_const();
2843 Bexpression
* bval
= val
->get_backend(&context
);
2845 std::string
asm_name(go_selectively_encode_id(sym_name
));
2846 Btype
*btype
= val
->type()->get_backend(gogo
);
2847 Bvariable
* ret
= gogo
->backend()->implicit_variable(sym_name
, asm_name
,
2850 gogo
->backend()->implicit_variable_set_init(ret
, sym_name
, btype
, false,
2852 ins
.first
->second
= ret
;
2856 // A GCProg is used to build a program for the garbage collector.
2857 // This is used for types with a lot of pointer data, to reduce the
2858 // size of the data in the compiled program. The program is expanded
2859 // at runtime. For the format, see runGCProg in libgo/go/runtime/mbitmap.go.
2865 : bytes_(), index_(0), nb_(0)
2868 // The number of bits described so far.
2871 { return this->index_
; }
2874 set_from(Gogo
*, Type
*, int64_t ptrsize
, int64_t offset
);
2880 constructor(Gogo
* gogo
) const;
2887 should_repeat(int64_t, int64_t);
2890 repeat(int64_t, int64_t);
2893 zero_until(int64_t);
2904 // Add a byte to the program.
2906 byte(unsigned char x
)
2907 { this->bytes_
.push_back(x
); }
2909 // The maximum number of bytes of literal bits.
2910 static const int max_literal
= 127;
2913 std::vector
<unsigned char> bytes_
;
2914 // The index of the last bit described.
2916 // The current set of literal bits.
2917 unsigned char b_
[max_literal
];
2918 // The current number of literal bits.
2922 // Set data in gcprog starting from OFFSET based on TYPE. OFFSET
2923 // counts in bytes. PTRSIZE is the size of a pointer on the target
2927 GCProg::set_from(Gogo
* gogo
, Type
* type
, int64_t ptrsize
, int64_t offset
)
2929 switch (type
->base()->classification())
2932 case Type::TYPE_NIL
:
2933 case Type::TYPE_CALL_MULTIPLE_RESULT
:
2934 case Type::TYPE_NAMED
:
2935 case Type::TYPE_FORWARD
:
2938 case Type::TYPE_ERROR
:
2939 case Type::TYPE_VOID
:
2940 case Type::TYPE_BOOLEAN
:
2941 case Type::TYPE_INTEGER
:
2942 case Type::TYPE_FLOAT
:
2943 case Type::TYPE_COMPLEX
:
2944 case Type::TYPE_SINK
:
2947 case Type::TYPE_FUNCTION
:
2948 case Type::TYPE_POINTER
:
2949 case Type::TYPE_MAP
:
2950 case Type::TYPE_CHANNEL
:
2951 // These types are all a single pointer.
2952 go_assert((offset
% ptrsize
) == 0);
2953 this->ptr(offset
/ ptrsize
);
2956 case Type::TYPE_STRING
:
2957 // A string starts with a single pointer.
2958 go_assert((offset
% ptrsize
) == 0);
2959 this->ptr(offset
/ ptrsize
);
2962 case Type::TYPE_INTERFACE
:
2963 // An interface is two pointers.
2964 go_assert((offset
% ptrsize
) == 0);
2965 this->ptr(offset
/ ptrsize
);
2966 this->ptr((offset
/ ptrsize
) + 1);
2969 case Type::TYPE_STRUCT
:
2971 if (!type
->has_pointer())
2974 const Struct_field_list
* fields
= type
->struct_type()->fields();
2975 int64_t soffset
= 0;
2976 for (Struct_field_list::const_iterator pf
= fields
->begin();
2977 pf
!= fields
->end();
2980 int64_t field_align
;
2981 if (!pf
->type()->backend_type_field_align(gogo
, &field_align
))
2983 go_assert(saw_errors());
2986 soffset
= (soffset
+ (field_align
- 1)) &~ (field_align
- 1);
2988 this->set_from(gogo
, pf
->type(), ptrsize
, offset
+ soffset
);
2991 if (!pf
->type()->backend_type_size(gogo
, &field_size
))
2993 go_assert(saw_errors());
2996 soffset
+= field_size
;
3001 case Type::TYPE_ARRAY
:
3002 if (type
->is_slice_type())
3004 // A slice starts with a single pointer.
3005 go_assert((offset
% ptrsize
) == 0);
3006 this->ptr(offset
/ ptrsize
);
3011 if (!type
->has_pointer())
3015 if (!type
->array_type()->int_length(&len
))
3017 go_assert(saw_errors());
3021 Type
* element_type
= type
->array_type()->element_type();
3023 // Flatten array of array to a big array by multiplying counts.
3024 while (element_type
->array_type() != NULL
3025 && !element_type
->is_slice_type())
3028 if (!element_type
->array_type()->int_length(&ele_len
))
3030 go_assert(saw_errors());
3035 element_type
= element_type
->array_type()->element_type();
3039 if (!element_type
->backend_type_size(gogo
, &ele_size
))
3041 go_assert(saw_errors());
3045 go_assert(len
> 0 && ele_size
> 0);
3047 if (!this->should_repeat(ele_size
/ ptrsize
, len
))
3049 // Cheaper to just emit the bits.
3050 int64_t eoffset
= 0;
3051 for (int64_t i
= 0; i
< len
; i
++, eoffset
+= ele_size
)
3052 this->set_from(gogo
, element_type
, ptrsize
, offset
+ eoffset
);
3056 go_assert((offset
% ptrsize
) == 0);
3057 go_assert((ele_size
% ptrsize
) == 0);
3058 this->set_from(gogo
, element_type
, ptrsize
, offset
);
3059 this->zero_until((offset
+ ele_size
) / ptrsize
);
3060 this->repeat(ele_size
/ ptrsize
, len
- 1);
3068 // Emit a 1 into the bit stream of a GC program at the given bit index.
3071 GCProg::ptr(int64_t index
)
3073 go_assert(index
>= this->index_
);
3074 this->zero_until(index
);
3078 // Return whether it is worthwhile to use a repeat to describe c
3079 // elements of n bits each, compared to just emitting c copies of the
3080 // n-bit description.
3083 GCProg::should_repeat(int64_t n
, int64_t c
)
3085 // Repeat if there is more than 1 item and if the total data doesn't
3086 // fit into four bytes.
3087 return c
> 1 && c
* n
> 4 * 8;
3090 // Emit an instruction to repeat the description of the last n words c
3091 // times (including the initial description, so c + 1 times in total).
3094 GCProg::repeat(int64_t n
, int64_t c
)
3096 if (n
== 0 || c
== 0)
3100 this->byte(0x80 | static_cast<unsigned char>(n
& 0x7f));
3107 this->index_
+= n
* c
;
3110 // Add zeros to the bit stream up to the given index.
3113 GCProg::zero_until(int64_t index
)
3115 go_assert(index
>= this->index_
);
3116 int64_t skip
= index
- this->index_
;
3121 for (int64_t i
= 0; i
< skip
; ++i
)
3127 this->repeat(1, skip
- 1);
3130 // Add a single literal bit to the program.
3133 GCProg::lit(unsigned char x
)
3135 if (this->nb_
== GCProg::max_literal
)
3137 this->b_
[this->nb_
] = x
;
3142 // Emit the varint encoding of x.
3145 GCProg::varint(int64_t x
)
3150 this->byte(0x80 | static_cast<unsigned char>(x
& 0x7f));
3153 this->byte(static_cast<unsigned char>(x
& 0x7f));
3156 // Flush any pending literal bits.
3163 this->byte(static_cast<unsigned char>(this->nb_
));
3164 unsigned char bits
= 0;
3165 for (int i
= 0; i
< this->nb_
; ++i
)
3167 bits
|= this->b_
[i
] << (i
% 8);
3168 if ((i
+ 1) % 8 == 0)
3174 if (this->nb_
% 8 != 0)
3179 // Mark the end of a GC program.
3188 // Return an Expression for the bytes in a GC program.
3191 GCProg::constructor(Gogo
* gogo
) const
3193 Location bloc
= Linemap::predeclared_location();
3195 // The first four bytes are the length of the program in target byte
3196 // order. Build a struct whose first type is uint32 to make this
3199 Type
* uint32_type
= Type::lookup_integer_type("uint32");
3201 Type
* byte_type
= gogo
->lookup_global("byte")->type_value();
3202 Expression
* len
= Expression::make_integer_ul(this->bytes_
.size(), NULL
,
3204 Array_type
* at
= Type::make_array_type(byte_type
, len
);
3206 Struct_type
* st
= Type::make_builtin_struct_type(2, "len", uint32_type
,
3209 Expression_list
* vals
= new Expression_list();
3210 vals
->reserve(this->bytes_
.size());
3211 for (std::vector
<unsigned char>::const_iterator p
= this->bytes_
.begin();
3212 p
!= this->bytes_
.end();
3214 vals
->push_back(Expression::make_integer_ul(*p
, byte_type
, bloc
));
3215 Expression
* bytes
= Expression::make_array_composite_literal(at
, vals
, bloc
);
3217 vals
= new Expression_list();
3218 vals
->push_back(Expression::make_integer_ul(this->bytes_
.size(), uint32_type
,
3220 vals
->push_back(bytes
);
3222 return Expression::make_struct_composite_literal(st
, vals
, bloc
);
3225 // Return a composite literal for the garbage collection program for
3226 // this type. This is only used for types that are too large to use a
3230 Type::gcprog_constructor(Gogo
* gogo
, int64_t ptrsize
, int64_t ptrdata
)
3232 Location bloc
= Linemap::predeclared_location();
3235 prog
.set_from(gogo
, this, ptrsize
, 0);
3236 int64_t offset
= prog
.bit_index() * ptrsize
;
3240 if (!this->backend_type_size(gogo
, &type_size
))
3242 go_assert(saw_errors());
3243 return Expression::make_error(bloc
);
3246 go_assert(offset
>= ptrdata
&& offset
<= type_size
);
3248 return prog
.constructor(gogo
);
3251 // Return a composite literal for the uncommon type information for
3252 // this type. UNCOMMON_STRUCT_TYPE is the type of the uncommon type
3253 // struct. If name is not NULL, it is the name of the type. If
3254 // METHODS is not NULL, it is the list of methods. ONLY_VALUE_METHODS
3255 // is true if only value methods should be included. At least one of
3256 // NAME and METHODS must not be NULL.
3259 Type::uncommon_type_constructor(Gogo
* gogo
, Type
* uncommon_type
,
3260 Named_type
* name
, const Methods
* methods
,
3261 bool only_value_methods
) const
3263 Location bloc
= Linemap::predeclared_location();
3265 const Struct_field_list
* fields
= uncommon_type
->struct_type()->fields();
3267 Expression_list
* vals
= new Expression_list();
3270 Struct_field_list::const_iterator p
= fields
->begin();
3271 go_assert(p
->is_field_name("name"));
3274 go_assert(p
->is_field_name("pkgPath"));
3278 vals
->push_back(Expression::make_nil(bloc
));
3279 vals
->push_back(Expression::make_nil(bloc
));
3283 Named_object
* no
= name
->named_object();
3284 std::string n
= Gogo::unpack_hidden_name(no
->name());
3285 Expression
* s
= Expression::make_string(n
, bloc
);
3286 vals
->push_back(Expression::make_unary(OPERATOR_AND
, s
, bloc
));
3288 if (name
->is_builtin())
3289 vals
->push_back(Expression::make_nil(bloc
));
3292 const Package
* package
= no
->package();
3293 const std::string
& pkgpath(package
== NULL
3295 : package
->pkgpath());
3296 s
= Expression::make_string(pkgpath
, bloc
);
3297 vals
->push_back(Expression::make_unary(OPERATOR_AND
, s
, bloc
));
3302 go_assert(p
->is_field_name("methods"));
3303 vals
->push_back(this->methods_constructor(gogo
, p
->type(), methods
,
3304 only_value_methods
));
3307 go_assert(p
== fields
->end());
3309 Expression
* r
= Expression::make_struct_composite_literal(uncommon_type
,
3311 return Expression::make_unary(OPERATOR_AND
, r
, bloc
);
3314 // Sort methods by name.
3320 operator()(const std::pair
<std::string
, const Method
*>& m1
,
3321 const std::pair
<std::string
, const Method
*>& m2
) const
3323 return (Gogo::unpack_hidden_name(m1
.first
)
3324 < Gogo::unpack_hidden_name(m2
.first
));
3328 // Return a composite literal for the type method table for this type.
3329 // METHODS_TYPE is the type of the table, and is a slice type.
3330 // METHODS is the list of methods. If ONLY_VALUE_METHODS is true,
3331 // then only value methods are used.
3334 Type::methods_constructor(Gogo
* gogo
, Type
* methods_type
,
3335 const Methods
* methods
,
3336 bool only_value_methods
) const
3338 Location bloc
= Linemap::predeclared_location();
3340 std::vector
<std::pair
<std::string
, const Method
*> > smethods
;
3341 if (methods
!= NULL
)
3343 smethods
.reserve(methods
->count());
3344 for (Methods::const_iterator p
= methods
->begin();
3345 p
!= methods
->end();
3348 if (p
->second
->is_ambiguous())
3350 if (only_value_methods
&& !p
->second
->is_value_method())
3353 // This is where we implement the magic //go:nointerface
3354 // comment. If we saw that comment, we don't add this
3355 // method to the type descriptor.
3356 if (p
->second
->nointerface())
3359 smethods
.push_back(std::make_pair(p
->first
, p
->second
));
3363 if (smethods
.empty())
3364 return Expression::make_slice_composite_literal(methods_type
, NULL
, bloc
);
3366 std::sort(smethods
.begin(), smethods
.end(), Sort_methods());
3368 Type
* method_type
= methods_type
->array_type()->element_type();
3370 Expression_list
* vals
= new Expression_list();
3371 vals
->reserve(smethods
.size());
3372 for (std::vector
<std::pair
<std::string
, const Method
*> >::const_iterator p
3374 p
!= smethods
.end();
3376 vals
->push_back(this->method_constructor(gogo
, method_type
, p
->first
,
3377 p
->second
, only_value_methods
));
3379 return Expression::make_slice_composite_literal(methods_type
, vals
, bloc
);
3382 // Return a composite literal for a single method. METHOD_TYPE is the
3383 // type of the entry. METHOD_NAME is the name of the method and M is
3384 // the method information.
3387 Type::method_constructor(Gogo
*, Type
* method_type
,
3388 const std::string
& method_name
,
3390 bool only_value_methods
) const
3392 Location bloc
= Linemap::predeclared_location();
3394 const Struct_field_list
* fields
= method_type
->struct_type()->fields();
3396 Expression_list
* vals
= new Expression_list();
3399 Struct_field_list::const_iterator p
= fields
->begin();
3400 go_assert(p
->is_field_name("name"));
3401 const std::string n
= Gogo::unpack_hidden_name(method_name
);
3402 Expression
* s
= Expression::make_string(n
, bloc
);
3403 vals
->push_back(Expression::make_unary(OPERATOR_AND
, s
, bloc
));
3406 go_assert(p
->is_field_name("pkgPath"));
3407 if (!Gogo::is_hidden_name(method_name
))
3408 vals
->push_back(Expression::make_nil(bloc
));
3411 s
= Expression::make_string(Gogo::hidden_name_pkgpath(method_name
),
3413 vals
->push_back(Expression::make_unary(OPERATOR_AND
, s
, bloc
));
3416 Named_object
* no
= (m
->needs_stub_method()
3418 : m
->named_object());
3420 Function_type
* mtype
;
3421 if (no
->is_function())
3422 mtype
= no
->func_value()->type();
3424 mtype
= no
->func_declaration_value()->type();
3425 go_assert(mtype
->is_method());
3426 Type
* nonmethod_type
= mtype
->copy_without_receiver();
3429 go_assert(p
->is_field_name("mtyp"));
3430 vals
->push_back(Expression::make_type_descriptor(nonmethod_type
, bloc
));
3433 go_assert(p
->is_field_name("typ"));
3434 bool want_pointer_receiver
= !only_value_methods
&& m
->is_value_method();
3435 nonmethod_type
= mtype
->copy_with_receiver_as_param(want_pointer_receiver
);
3436 vals
->push_back(Expression::make_type_descriptor(nonmethod_type
, bloc
));
3439 go_assert(p
->is_field_name("tfn"));
3440 vals
->push_back(Expression::make_func_code_reference(no
, bloc
));
3443 go_assert(p
== fields
->end());
3445 return Expression::make_struct_composite_literal(method_type
, vals
, bloc
);
3448 // Return a composite literal for the type descriptor of a plain type.
3449 // RUNTIME_TYPE_KIND is the value of the kind field. If NAME is not
3450 // NULL, it is the name to use as well as the list of methods.
3453 Type::plain_type_descriptor(Gogo
* gogo
, int runtime_type_kind
,
3456 return this->type_descriptor_constructor(gogo
, runtime_type_kind
,
3460 // Return the type reflection string for this type.
3463 Type::reflection(Gogo
* gogo
) const
3467 // The do_reflection virtual function should set RET to the
3468 // reflection string.
3469 this->do_reflection(gogo
, &ret
);
3474 // Return whether the backend size of the type is known.
3477 Type::is_backend_type_size_known(Gogo
* gogo
)
3479 switch (this->classification_
)
3493 case TYPE_INTERFACE
:
3498 const Struct_field_list
* fields
= this->struct_type()->fields();
3499 for (Struct_field_list::const_iterator pf
= fields
->begin();
3500 pf
!= fields
->end();
3502 if (!pf
->type()->is_backend_type_size_known(gogo
))
3509 const Array_type
* at
= this->array_type();
3510 if (at
->length() == NULL
)
3514 Numeric_constant nc
;
3515 if (!at
->length()->numeric_constant_value(&nc
))
3518 if (!nc
.to_int(&ival
))
3521 return at
->element_type()->is_backend_type_size_known(gogo
);
3526 this->named_type()->convert(gogo
);
3527 return this->named_type()->is_named_backend_type_size_known();
3531 Forward_declaration_type
* fdt
= this->forward_declaration_type();
3532 return fdt
->real_type()->is_backend_type_size_known(gogo
);
3536 case TYPE_CALL_MULTIPLE_RESULT
:
3544 // If the size of the type can be determined, set *PSIZE to the size
3545 // in bytes and return true. Otherwise, return false. This queries
3549 Type::backend_type_size(Gogo
* gogo
, int64_t *psize
)
3551 if (!this->is_backend_type_size_known(gogo
))
3553 if (this->is_error_type())
3555 Btype
* bt
= this->get_backend_placeholder(gogo
);
3556 *psize
= gogo
->backend()->type_size(bt
);
3559 if (this->named_type() != NULL
)
3560 go_error_at(this->named_type()->location(),
3561 "type %s larger than address space",
3562 Gogo::message_name(this->named_type()->name()).c_str());
3564 go_error_at(Linemap::unknown_location(),
3565 "type %s larger than address space",
3566 this->reflection(gogo
).c_str());
3568 // Make this an error type to avoid knock-on errors.
3569 this->classification_
= TYPE_ERROR
;
3575 // If the alignment of the type can be determined, set *PALIGN to
3576 // the alignment in bytes and return true. Otherwise, return false.
3579 Type::backend_type_align(Gogo
* gogo
, int64_t *palign
)
3581 if (!this->is_backend_type_size_known(gogo
))
3583 Btype
* bt
= this->get_backend_placeholder(gogo
);
3584 *palign
= gogo
->backend()->type_alignment(bt
);
3588 // Like backend_type_align, but return the alignment when used as a
3592 Type::backend_type_field_align(Gogo
* gogo
, int64_t *palign
)
3594 if (!this->is_backend_type_size_known(gogo
))
3596 Btype
* bt
= this->get_backend_placeholder(gogo
);
3597 *palign
= gogo
->backend()->type_field_alignment(bt
);
3601 // Get the ptrdata value for a type. This is the size of the prefix
3602 // of the type that contains all pointers. Store the ptrdata in
3603 // *PPTRDATA and return whether we found it.
3606 Type::backend_type_ptrdata(Gogo
* gogo
, int64_t* pptrdata
)
3610 if (!this->has_pointer())
3613 if (!this->is_backend_type_size_known(gogo
))
3616 switch (this->classification_
)
3625 // These types are nothing but a pointer.
3626 return this->backend_type_size(gogo
, pptrdata
);
3628 case TYPE_INTERFACE
:
3629 // An interface is a struct of two pointers.
3630 return this->backend_type_size(gogo
, pptrdata
);
3634 // A string is a struct whose first field is a pointer, and
3635 // whose second field is not.
3636 Type
* uint8_type
= Type::lookup_integer_type("uint8");
3637 Type
* ptr
= Type::make_pointer_type(uint8_type
);
3638 return ptr
->backend_type_size(gogo
, pptrdata
);
3643 return this->base()->backend_type_ptrdata(gogo
, pptrdata
);
3647 const Struct_field_list
* fields
= this->struct_type()->fields();
3649 const Struct_field
*ptr
= NULL
;
3650 int64_t ptr_offset
= 0;
3651 for (Struct_field_list::const_iterator pf
= fields
->begin();
3652 pf
!= fields
->end();
3655 int64_t field_align
;
3656 if (!pf
->type()->backend_type_field_align(gogo
, &field_align
))
3658 offset
= (offset
+ (field_align
- 1)) &~ (field_align
- 1);
3660 if (pf
->type()->has_pointer())
3663 ptr_offset
= offset
;
3667 if (!pf
->type()->backend_type_size(gogo
, &field_size
))
3669 offset
+= field_size
;
3674 int64_t ptr_ptrdata
;
3675 if (!ptr
->type()->backend_type_ptrdata(gogo
, &ptr_ptrdata
))
3677 *pptrdata
= ptr_offset
+ ptr_ptrdata
;
3683 if (this->is_slice_type())
3685 // A slice is a struct whose first field is a pointer, and
3686 // whose remaining fields are not.
3687 Type
* element_type
= this->array_type()->element_type();
3688 Type
* ptr
= Type::make_pointer_type(element_type
);
3689 return ptr
->backend_type_size(gogo
, pptrdata
);
3693 Numeric_constant nc
;
3694 if (!this->array_type()->length()->numeric_constant_value(&nc
))
3697 if (!nc
.to_memory_size(&len
))
3700 Type
* element_type
= this->array_type()->element_type();
3702 int64_t ele_ptrdata
;
3703 if (!element_type
->backend_type_size(gogo
, &ele_size
)
3704 || !element_type
->backend_type_ptrdata(gogo
, &ele_ptrdata
))
3706 go_assert(ele_size
> 0 && ele_ptrdata
> 0);
3708 *pptrdata
= (len
- 1) * ele_size
+ ele_ptrdata
;
3720 case TYPE_CALL_MULTIPLE_RESULT
:
3725 // Get the ptrdata value to store in a type descriptor. This is
3726 // normally the same as backend_type_ptrdata, but for a type that is
3727 // large enough to use a gcprog we may need to store a different value
3728 // if it ends with an array. If the gcprog uses a repeat descriptor
3729 // for the array, and if the array element ends with non-pointer data,
3730 // then the gcprog will produce a value that describes the complete
3731 // array where the backend ptrdata will omit the non-pointer elements
3732 // of the final array element. This is a subtle difference but the
3733 // run time code checks it to verify that it has expanded a gcprog as
3737 Type::descriptor_ptrdata(Gogo
* gogo
, int64_t* pptrdata
)
3739 int64_t backend_ptrdata
;
3740 if (!this->backend_type_ptrdata(gogo
, &backend_ptrdata
))
3744 if (!this->needs_gcprog(gogo
, &ptrsize
, &backend_ptrdata
))
3746 *pptrdata
= backend_ptrdata
;
3751 prog
.set_from(gogo
, this, ptrsize
, 0);
3752 int64_t offset
= prog
.bit_index() * ptrsize
;
3754 go_assert(offset
>= backend_ptrdata
);
3759 // Default function to export a type.
3762 Type::do_export(Export
*) const
3770 Type::import_type(Import
* imp
)
3772 if (imp
->match_c_string("("))
3773 return Function_type::do_import(imp
);
3774 else if (imp
->match_c_string("*"))
3775 return Pointer_type::do_import(imp
);
3776 else if (imp
->match_c_string("struct "))
3777 return Struct_type::do_import(imp
);
3778 else if (imp
->match_c_string("["))
3779 return Array_type::do_import(imp
);
3780 else if (imp
->match_c_string("map "))
3781 return Map_type::do_import(imp
);
3782 else if (imp
->match_c_string("chan "))
3783 return Channel_type::do_import(imp
);
3784 else if (imp
->match_c_string("interface"))
3785 return Interface_type::do_import(imp
);
3788 go_error_at(imp
->location(), "import error: expected type");
3789 return Type::make_error_type();
3793 // Class Error_type.
3795 // Return the backend representation of an Error type.
3798 Error_type::do_get_backend(Gogo
* gogo
)
3800 return gogo
->backend()->error_type();
3803 // Return an expression for the type descriptor for an error type.
3807 Error_type::do_type_descriptor(Gogo
*, Named_type
*)
3809 return Expression::make_error(Linemap::predeclared_location());
3812 // We should not be asked for the reflection string for an error type.
3815 Error_type::do_reflection(Gogo
*, std::string
*) const
3817 go_assert(saw_errors());
3821 Type::make_error_type()
3823 static Error_type singleton_error_type
;
3824 return &singleton_error_type
;
3829 // Get the backend representation of a void type.
3832 Void_type::do_get_backend(Gogo
* gogo
)
3834 return gogo
->backend()->void_type();
3838 Type::make_void_type()
3840 static Void_type singleton_void_type
;
3841 return &singleton_void_type
;
3844 // Class Boolean_type.
3846 // Return the backend representation of the boolean type.
3849 Boolean_type::do_get_backend(Gogo
* gogo
)
3851 return gogo
->backend()->bool_type();
3854 // Make the type descriptor.
3857 Boolean_type::do_type_descriptor(Gogo
* gogo
, Named_type
* name
)
3860 return this->plain_type_descriptor(gogo
, RUNTIME_TYPE_KIND_BOOL
, name
);
3863 Named_object
* no
= gogo
->lookup_global("bool");
3864 go_assert(no
!= NULL
);
3865 return Type::type_descriptor(gogo
, no
->type_value());
3870 Type::make_boolean_type()
3872 static Boolean_type boolean_type
;
3873 return &boolean_type
;
3876 // The named type "bool".
3878 static Named_type
* named_bool_type
;
3880 // Get the named type "bool".
3883 Type::lookup_bool_type()
3885 return named_bool_type
;
3888 // Make the named type "bool".
3891 Type::make_named_bool_type()
3893 Type
* bool_type
= Type::make_boolean_type();
3894 Named_object
* named_object
=
3895 Named_object::make_type("bool", NULL
, bool_type
,
3896 Linemap::predeclared_location());
3897 Named_type
* named_type
= named_object
->type_value();
3898 named_bool_type
= named_type
;
3902 // Class Integer_type.
3904 Integer_type::Named_integer_types
Integer_type::named_integer_types
;
3906 // Create a new integer type. Non-abstract integer types always have
3910 Integer_type::create_integer_type(const char* name
, bool is_unsigned
,
3911 int bits
, int runtime_type_kind
)
3913 Integer_type
* integer_type
= new Integer_type(false, is_unsigned
, bits
,
3915 std::string
sname(name
);
3916 Named_object
* named_object
=
3917 Named_object::make_type(sname
, NULL
, integer_type
,
3918 Linemap::predeclared_location());
3919 Named_type
* named_type
= named_object
->type_value();
3920 std::pair
<Named_integer_types::iterator
, bool> ins
=
3921 Integer_type::named_integer_types
.insert(std::make_pair(sname
, named_type
));
3922 go_assert(ins
.second
);
3926 // Look up an existing integer type.
3929 Integer_type::lookup_integer_type(const char* name
)
3931 Named_integer_types::const_iterator p
=
3932 Integer_type::named_integer_types
.find(name
);
3933 go_assert(p
!= Integer_type::named_integer_types
.end());
3937 // Create a new abstract integer type.
3940 Integer_type::create_abstract_integer_type()
3942 static Integer_type
* abstract_type
;
3943 if (abstract_type
== NULL
)
3945 Type
* int_type
= Type::lookup_integer_type("int");
3946 abstract_type
= new Integer_type(true, false,
3947 int_type
->integer_type()->bits(),
3948 RUNTIME_TYPE_KIND_INT
);
3950 return abstract_type
;
3953 // Create a new abstract character type.
3956 Integer_type::create_abstract_character_type()
3958 static Integer_type
* abstract_type
;
3959 if (abstract_type
== NULL
)
3961 abstract_type
= new Integer_type(true, false, 32,
3962 RUNTIME_TYPE_KIND_INT32
);
3963 abstract_type
->set_is_rune();
3965 return abstract_type
;
3968 // Integer type compatibility.
3971 Integer_type::is_identical(const Integer_type
* t
) const
3973 if (this->is_unsigned_
!= t
->is_unsigned_
|| this->bits_
!= t
->bits_
)
3975 return this->is_abstract_
== t
->is_abstract_
;
3981 Integer_type::do_hash_for_method(Gogo
*) const
3983 return ((this->bits_
<< 4)
3984 + ((this->is_unsigned_
? 1 : 0) << 8)
3985 + ((this->is_abstract_
? 1 : 0) << 9));
3988 // Convert an Integer_type to the backend representation.
3991 Integer_type::do_get_backend(Gogo
* gogo
)
3993 if (this->is_abstract_
)
3995 go_assert(saw_errors());
3996 return gogo
->backend()->error_type();
3998 return gogo
->backend()->integer_type(this->is_unsigned_
, this->bits_
);
4001 // The type descriptor for an integer type. Integer types are always
4005 Integer_type::do_type_descriptor(Gogo
* gogo
, Named_type
* name
)
4007 go_assert(name
!= NULL
|| saw_errors());
4008 return this->plain_type_descriptor(gogo
, this->runtime_type_kind_
, name
);
4011 // We should not be asked for the reflection string of a basic type.
4014 Integer_type::do_reflection(Gogo
*, std::string
*) const
4016 go_assert(saw_errors());
4019 // Make an integer type.
4022 Type::make_integer_type(const char* name
, bool is_unsigned
, int bits
,
4023 int runtime_type_kind
)
4025 return Integer_type::create_integer_type(name
, is_unsigned
, bits
,
4029 // Make an abstract integer type.
4032 Type::make_abstract_integer_type()
4034 return Integer_type::create_abstract_integer_type();
4037 // Make an abstract character type.
4040 Type::make_abstract_character_type()
4042 return Integer_type::create_abstract_character_type();
4045 // Look up an integer type.
4048 Type::lookup_integer_type(const char* name
)
4050 return Integer_type::lookup_integer_type(name
);
4053 // Class Float_type.
4055 Float_type::Named_float_types
Float_type::named_float_types
;
4057 // Create a new float type. Non-abstract float types always have
4061 Float_type::create_float_type(const char* name
, int bits
,
4062 int runtime_type_kind
)
4064 Float_type
* float_type
= new Float_type(false, bits
, runtime_type_kind
);
4065 std::string
sname(name
);
4066 Named_object
* named_object
=
4067 Named_object::make_type(sname
, NULL
, float_type
,
4068 Linemap::predeclared_location());
4069 Named_type
* named_type
= named_object
->type_value();
4070 std::pair
<Named_float_types::iterator
, bool> ins
=
4071 Float_type::named_float_types
.insert(std::make_pair(sname
, named_type
));
4072 go_assert(ins
.second
);
4076 // Look up an existing float type.
4079 Float_type::lookup_float_type(const char* name
)
4081 Named_float_types::const_iterator p
=
4082 Float_type::named_float_types
.find(name
);
4083 go_assert(p
!= Float_type::named_float_types
.end());
4087 // Create a new abstract float type.
4090 Float_type::create_abstract_float_type()
4092 static Float_type
* abstract_type
;
4093 if (abstract_type
== NULL
)
4094 abstract_type
= new Float_type(true, 64, RUNTIME_TYPE_KIND_FLOAT64
);
4095 return abstract_type
;
4098 // Whether this type is identical with T.
4101 Float_type::is_identical(const Float_type
* t
) const
4103 if (this->bits_
!= t
->bits_
)
4105 return this->is_abstract_
== t
->is_abstract_
;
4111 Float_type::do_hash_for_method(Gogo
*) const
4113 return (this->bits_
<< 4) + ((this->is_abstract_
? 1 : 0) << 8);
4116 // Convert to the backend representation.
4119 Float_type::do_get_backend(Gogo
* gogo
)
4121 return gogo
->backend()->float_type(this->bits_
);
4124 // The type descriptor for a float type. Float types are always named.
4127 Float_type::do_type_descriptor(Gogo
* gogo
, Named_type
* name
)
4129 go_assert(name
!= NULL
|| saw_errors());
4130 return this->plain_type_descriptor(gogo
, this->runtime_type_kind_
, name
);
4133 // We should not be asked for the reflection string of a basic type.
4136 Float_type::do_reflection(Gogo
*, std::string
*) const
4138 go_assert(saw_errors());
4141 // Make a floating point type.
4144 Type::make_float_type(const char* name
, int bits
, int runtime_type_kind
)
4146 return Float_type::create_float_type(name
, bits
, runtime_type_kind
);
4149 // Make an abstract float type.
4152 Type::make_abstract_float_type()
4154 return Float_type::create_abstract_float_type();
4157 // Look up a float type.
4160 Type::lookup_float_type(const char* name
)
4162 return Float_type::lookup_float_type(name
);
4165 // Class Complex_type.
4167 Complex_type::Named_complex_types
Complex_type::named_complex_types
;
4169 // Create a new complex type. Non-abstract complex types always have
4173 Complex_type::create_complex_type(const char* name
, int bits
,
4174 int runtime_type_kind
)
4176 Complex_type
* complex_type
= new Complex_type(false, bits
,
4178 std::string
sname(name
);
4179 Named_object
* named_object
=
4180 Named_object::make_type(sname
, NULL
, complex_type
,
4181 Linemap::predeclared_location());
4182 Named_type
* named_type
= named_object
->type_value();
4183 std::pair
<Named_complex_types::iterator
, bool> ins
=
4184 Complex_type::named_complex_types
.insert(std::make_pair(sname
,
4186 go_assert(ins
.second
);
4190 // Look up an existing complex type.
4193 Complex_type::lookup_complex_type(const char* name
)
4195 Named_complex_types::const_iterator p
=
4196 Complex_type::named_complex_types
.find(name
);
4197 go_assert(p
!= Complex_type::named_complex_types
.end());
4201 // Create a new abstract complex type.
4204 Complex_type::create_abstract_complex_type()
4206 static Complex_type
* abstract_type
;
4207 if (abstract_type
== NULL
)
4208 abstract_type
= new Complex_type(true, 128, RUNTIME_TYPE_KIND_COMPLEX128
);
4209 return abstract_type
;
4212 // Whether this type is identical with T.
4215 Complex_type::is_identical(const Complex_type
*t
) const
4217 if (this->bits_
!= t
->bits_
)
4219 return this->is_abstract_
== t
->is_abstract_
;
4225 Complex_type::do_hash_for_method(Gogo
*) const
4227 return (this->bits_
<< 4) + ((this->is_abstract_
? 1 : 0) << 8);
4230 // Convert to the backend representation.
4233 Complex_type::do_get_backend(Gogo
* gogo
)
4235 return gogo
->backend()->complex_type(this->bits_
);
4238 // The type descriptor for a complex type. Complex types are always
4242 Complex_type::do_type_descriptor(Gogo
* gogo
, Named_type
* name
)
4244 go_assert(name
!= NULL
|| saw_errors());
4245 return this->plain_type_descriptor(gogo
, this->runtime_type_kind_
, name
);
4248 // We should not be asked for the reflection string of a basic type.
4251 Complex_type::do_reflection(Gogo
*, std::string
*) const
4253 go_assert(saw_errors());
4256 // Make a complex type.
4259 Type::make_complex_type(const char* name
, int bits
, int runtime_type_kind
)
4261 return Complex_type::create_complex_type(name
, bits
, runtime_type_kind
);
4264 // Make an abstract complex type.
4267 Type::make_abstract_complex_type()
4269 return Complex_type::create_abstract_complex_type();
4272 // Look up a complex type.
4275 Type::lookup_complex_type(const char* name
)
4277 return Complex_type::lookup_complex_type(name
);
4280 // Class String_type.
4282 // Convert String_type to the backend representation. A string is a
4283 // struct with two fields: a pointer to the characters and a length.
4286 String_type::do_get_backend(Gogo
* gogo
)
4288 static Btype
* backend_string_type
;
4289 if (backend_string_type
== NULL
)
4291 std::vector
<Backend::Btyped_identifier
> fields(2);
4293 Type
* b
= gogo
->lookup_global("byte")->type_value();
4294 Type
* pb
= Type::make_pointer_type(b
);
4296 // We aren't going to get back to this field to finish the
4297 // backend representation, so force it to be finished now.
4298 if (!gogo
->named_types_are_converted())
4300 Btype
* bt
= pb
->get_backend_placeholder(gogo
);
4301 pb
->finish_backend(gogo
, bt
);
4304 fields
[0].name
= "__data";
4305 fields
[0].btype
= pb
->get_backend(gogo
);
4306 fields
[0].location
= Linemap::predeclared_location();
4308 Type
* int_type
= Type::lookup_integer_type("int");
4309 fields
[1].name
= "__length";
4310 fields
[1].btype
= int_type
->get_backend(gogo
);
4311 fields
[1].location
= fields
[0].location
;
4313 backend_string_type
= gogo
->backend()->struct_type(fields
);
4315 return backend_string_type
;
4318 // The type descriptor for the string type.
4321 String_type::do_type_descriptor(Gogo
* gogo
, Named_type
* name
)
4324 return this->plain_type_descriptor(gogo
, RUNTIME_TYPE_KIND_STRING
, name
);
4327 Named_object
* no
= gogo
->lookup_global("string");
4328 go_assert(no
!= NULL
);
4329 return Type::type_descriptor(gogo
, no
->type_value());
4333 // We should not be asked for the reflection string of a basic type.
4336 String_type::do_reflection(Gogo
*, std::string
* ret
) const
4338 ret
->append("string");
4341 // Make a string type.
4344 Type::make_string_type()
4346 static String_type string_type
;
4347 return &string_type
;
4350 // The named type "string".
4352 static Named_type
* named_string_type
;
4354 // Get the named type "string".
4357 Type::lookup_string_type()
4359 return named_string_type
;
4362 // Make the named type string.
4365 Type::make_named_string_type()
4367 Type
* string_type
= Type::make_string_type();
4368 Named_object
* named_object
=
4369 Named_object::make_type("string", NULL
, string_type
,
4370 Linemap::predeclared_location());
4371 Named_type
* named_type
= named_object
->type_value();
4372 named_string_type
= named_type
;
4376 // The sink type. This is the type of the blank identifier _. Any
4377 // type may be assigned to it.
4379 class Sink_type
: public Type
4388 do_compare_is_identity(Gogo
*)
4392 do_get_backend(Gogo
*)
4393 { go_unreachable(); }
4396 do_type_descriptor(Gogo
*, Named_type
*)
4397 { go_unreachable(); }
4400 do_reflection(Gogo
*, std::string
*) const
4401 { go_unreachable(); }
4404 do_mangled_name(Gogo
*, std::string
*) const
4405 { go_unreachable(); }
4408 // Make the sink type.
4411 Type::make_sink_type()
4413 static Sink_type sink_type
;
4417 // Class Function_type.
4422 Function_type::do_traverse(Traverse
* traverse
)
4424 if (this->receiver_
!= NULL
4425 && Type::traverse(this->receiver_
->type(), traverse
) == TRAVERSE_EXIT
)
4426 return TRAVERSE_EXIT
;
4427 if (this->parameters_
!= NULL
4428 && this->parameters_
->traverse(traverse
) == TRAVERSE_EXIT
)
4429 return TRAVERSE_EXIT
;
4430 if (this->results_
!= NULL
4431 && this->results_
->traverse(traverse
) == TRAVERSE_EXIT
)
4432 return TRAVERSE_EXIT
;
4433 return TRAVERSE_CONTINUE
;
4436 // Returns whether T is a valid redeclaration of this type. If this
4437 // returns false, and REASON is not NULL, *REASON may be set to a
4438 // brief explanation of why it returned false.
4441 Function_type::is_valid_redeclaration(const Function_type
* t
,
4442 std::string
* reason
) const
4444 if (!this->is_identical(t
, false, COMPARE_TAGS
, true, reason
))
4447 // A redeclaration of a function is required to use the same names
4448 // for the receiver and parameters.
4449 if (this->receiver() != NULL
4450 && this->receiver()->name() != t
->receiver()->name())
4453 *reason
= "receiver name changed";
4457 const Typed_identifier_list
* parms1
= this->parameters();
4458 const Typed_identifier_list
* parms2
= t
->parameters();
4461 Typed_identifier_list::const_iterator p1
= parms1
->begin();
4462 for (Typed_identifier_list::const_iterator p2
= parms2
->begin();
4463 p2
!= parms2
->end();
4466 if (p1
->name() != p2
->name())
4469 *reason
= "parameter name changed";
4473 // This is called at parse time, so we may have unknown
4475 Type
* t1
= p1
->type()->forwarded();
4476 Type
* t2
= p2
->type()->forwarded();
4478 && t1
->forward_declaration_type() != NULL
4479 && (t2
->forward_declaration_type() == NULL
4480 || (t1
->forward_declaration_type()->named_object()
4481 != t2
->forward_declaration_type()->named_object())))
4486 const Typed_identifier_list
* results1
= this->results();
4487 const Typed_identifier_list
* results2
= t
->results();
4488 if (results1
!= NULL
)
4490 Typed_identifier_list::const_iterator res1
= results1
->begin();
4491 for (Typed_identifier_list::const_iterator res2
= results2
->begin();
4492 res2
!= results2
->end();
4495 if (res1
->name() != res2
->name())
4498 *reason
= "result name changed";
4502 // This is called at parse time, so we may have unknown
4504 Type
* t1
= res1
->type()->forwarded();
4505 Type
* t2
= res2
->type()->forwarded();
4507 && t1
->forward_declaration_type() != NULL
4508 && (t2
->forward_declaration_type() == NULL
4509 || (t1
->forward_declaration_type()->named_object()
4510 != t2
->forward_declaration_type()->named_object())))
4518 // Check whether T is the same as this type.
4521 Function_type::is_identical(const Function_type
* t
, bool ignore_receiver
,
4522 Cmp_tags cmp_tags
, bool errors_are_identical
,
4523 std::string
* reason
) const
4525 if (this->is_backend_function_type() != t
->is_backend_function_type())
4528 if (!ignore_receiver
)
4530 const Typed_identifier
* r1
= this->receiver();
4531 const Typed_identifier
* r2
= t
->receiver();
4532 if ((r1
!= NULL
) != (r2
!= NULL
))
4535 *reason
= _("different receiver types");
4540 if (!Type::are_identical_cmp_tags(r1
->type(), r2
->type(), cmp_tags
,
4541 errors_are_identical
, reason
))
4543 if (reason
!= NULL
&& !reason
->empty())
4544 *reason
= "receiver: " + *reason
;
4550 const Typed_identifier_list
* parms1
= this->parameters();
4551 if (parms1
!= NULL
&& parms1
->empty())
4553 const Typed_identifier_list
* parms2
= t
->parameters();
4554 if (parms2
!= NULL
&& parms2
->empty())
4556 if ((parms1
!= NULL
) != (parms2
!= NULL
))
4559 *reason
= _("different number of parameters");
4564 Typed_identifier_list::const_iterator p1
= parms1
->begin();
4565 for (Typed_identifier_list::const_iterator p2
= parms2
->begin();
4566 p2
!= parms2
->end();
4569 if (p1
== parms1
->end())
4572 *reason
= _("different number of parameters");
4576 if (!Type::are_identical_cmp_tags(p1
->type(), p2
->type(), cmp_tags
,
4577 errors_are_identical
, NULL
))
4580 *reason
= _("different parameter types");
4584 if (p1
!= parms1
->end())
4587 *reason
= _("different number of parameters");
4592 if (this->is_varargs() != t
->is_varargs())
4595 *reason
= _("different varargs");
4599 const Typed_identifier_list
* results1
= this->results();
4600 if (results1
!= NULL
&& results1
->empty())
4602 const Typed_identifier_list
* results2
= t
->results();
4603 if (results2
!= NULL
&& results2
->empty())
4605 if ((results1
!= NULL
) != (results2
!= NULL
))
4608 *reason
= _("different number of results");
4611 if (results1
!= NULL
)
4613 Typed_identifier_list::const_iterator res1
= results1
->begin();
4614 for (Typed_identifier_list::const_iterator res2
= results2
->begin();
4615 res2
!= results2
->end();
4618 if (res1
== results1
->end())
4621 *reason
= _("different number of results");
4625 if (!Type::are_identical_cmp_tags(res1
->type(), res2
->type(),
4626 cmp_tags
, errors_are_identical
,
4630 *reason
= _("different result types");
4634 if (res1
!= results1
->end())
4637 *reason
= _("different number of results");
4648 Function_type::do_hash_for_method(Gogo
* gogo
) const
4650 unsigned int ret
= 0;
4651 // We ignore the receiver type for hash codes, because we need to
4652 // get the same hash code for a method in an interface and a method
4653 // declared for a type. The former will not have a receiver.
4654 if (this->parameters_
!= NULL
)
4657 for (Typed_identifier_list::const_iterator p
= this->parameters_
->begin();
4658 p
!= this->parameters_
->end();
4660 ret
+= p
->type()->hash_for_method(gogo
) << shift
;
4662 if (this->results_
!= NULL
)
4665 for (Typed_identifier_list::const_iterator p
= this->results_
->begin();
4666 p
!= this->results_
->end();
4668 ret
+= p
->type()->hash_for_method(gogo
) << shift
;
4670 if (this->is_varargs_
)
4676 // Hash result parameters.
4679 Function_type::Results_hash::operator()(const Typed_identifier_list
* t
) const
4681 unsigned int hash
= 0;
4682 for (Typed_identifier_list::const_iterator p
= t
->begin();
4687 hash
= Type::hash_string(p
->name(), hash
);
4688 hash
+= p
->type()->hash_for_method(NULL
);
4693 // Compare result parameters so that can map identical result
4694 // parameters to a single struct type.
4697 Function_type::Results_equal::operator()(const Typed_identifier_list
* a
,
4698 const Typed_identifier_list
* b
) const
4700 if (a
->size() != b
->size())
4702 Typed_identifier_list::const_iterator pa
= a
->begin();
4703 for (Typed_identifier_list::const_iterator pb
= b
->begin();
4707 if (pa
->name() != pb
->name()
4708 || !Type::are_identical(pa
->type(), pb
->type(), true, NULL
))
4714 // Hash from results to a backend struct type.
4716 Function_type::Results_structs
Function_type::results_structs
;
4718 // Get the backend representation for a function type.
4721 Function_type::get_backend_fntype(Gogo
* gogo
)
4723 if (this->fnbtype_
== NULL
)
4725 Backend::Btyped_identifier breceiver
;
4726 if (this->receiver_
!= NULL
)
4728 breceiver
.name
= Gogo::unpack_hidden_name(this->receiver_
->name());
4730 // We always pass the address of the receiver parameter, in
4731 // order to make interface calls work with unknown types.
4732 Type
* rtype
= this->receiver_
->type();
4733 if (rtype
->points_to() == NULL
)
4734 rtype
= Type::make_pointer_type(rtype
);
4735 breceiver
.btype
= rtype
->get_backend(gogo
);
4736 breceiver
.location
= this->receiver_
->location();
4739 std::vector
<Backend::Btyped_identifier
> bparameters
;
4740 if (this->parameters_
!= NULL
)
4742 bparameters
.resize(this->parameters_
->size());
4744 for (Typed_identifier_list::const_iterator p
=
4745 this->parameters_
->begin(); p
!= this->parameters_
->end();
4748 bparameters
[i
].name
= Gogo::unpack_hidden_name(p
->name());
4749 bparameters
[i
].btype
= p
->type()->get_backend(gogo
);
4750 bparameters
[i
].location
= p
->location();
4752 go_assert(i
== bparameters
.size());
4755 std::vector
<Backend::Btyped_identifier
> bresults
;
4756 Btype
* bresult_struct
= NULL
;
4757 if (this->results_
!= NULL
)
4759 bresults
.resize(this->results_
->size());
4761 for (Typed_identifier_list::const_iterator p
=
4762 this->results_
->begin();
4763 p
!= this->results_
->end();
4766 bresults
[i
].name
= Gogo::unpack_hidden_name(p
->name());
4767 bresults
[i
].btype
= p
->type()->get_backend(gogo
);
4768 bresults
[i
].location
= p
->location();
4770 go_assert(i
== bresults
.size());
4772 if (this->results_
->size() > 1)
4774 // Use the same results struct for all functions that
4775 // return the same set of results. This is useful to
4776 // unify calls to interface methods with other calls.
4777 std::pair
<Typed_identifier_list
*, Btype
*> val
;
4778 val
.first
= this->results_
;
4780 std::pair
<Results_structs::iterator
, bool> ins
=
4781 Function_type::results_structs
.insert(val
);
4784 // Build a new struct type.
4785 Struct_field_list
* sfl
= new Struct_field_list
;
4786 for (Typed_identifier_list::const_iterator p
=
4787 this->results_
->begin();
4788 p
!= this->results_
->end();
4791 Typed_identifier tid
= *p
;
4792 if (tid
.name().empty())
4793 tid
= Typed_identifier("UNNAMED", tid
.type(),
4795 sfl
->push_back(Struct_field(tid
));
4797 Struct_type
* st
= Type::make_struct_type(sfl
,
4799 st
->set_is_struct_incomparable();
4800 ins
.first
->second
= st
->get_backend(gogo
);
4802 bresult_struct
= ins
.first
->second
;
4806 this->fnbtype_
= gogo
->backend()->function_type(breceiver
, bparameters
,
4807 bresults
, bresult_struct
,
4812 return this->fnbtype_
;
4815 // Get the backend representation for a Go function type.
4818 Function_type::do_get_backend(Gogo
* gogo
)
4820 // When we do anything with a function value other than call it, it
4821 // is represented as a pointer to a struct whose first field is the
4822 // actual function. So that is what we return as the type of a Go
4825 Location loc
= this->location();
4826 Btype
* struct_type
=
4827 gogo
->backend()->placeholder_struct_type("__go_descriptor", loc
);
4828 Btype
* ptr_struct_type
= gogo
->backend()->pointer_type(struct_type
);
4830 std::vector
<Backend::Btyped_identifier
> fields(1);
4831 fields
[0].name
= "code";
4832 fields
[0].btype
= this->get_backend_fntype(gogo
);
4833 fields
[0].location
= loc
;
4834 if (!gogo
->backend()->set_placeholder_struct_type(struct_type
, fields
))
4835 return gogo
->backend()->error_type();
4836 return ptr_struct_type
;
4839 // The type of a function type descriptor.
4842 Function_type::make_function_type_descriptor_type()
4847 Type
* tdt
= Type::make_type_descriptor_type();
4848 Type
* ptdt
= Type::make_type_descriptor_ptr_type();
4850 Type
* bool_type
= Type::lookup_bool_type();
4852 Type
* slice_type
= Type::make_array_type(ptdt
, NULL
);
4854 Struct_type
* s
= Type::make_builtin_struct_type(4,
4856 "dotdotdot", bool_type
,
4860 ret
= Type::make_builtin_named_type("FuncType", s
);
4866 // The type descriptor for a function type.
4869 Function_type::do_type_descriptor(Gogo
* gogo
, Named_type
* name
)
4871 Location bloc
= Linemap::predeclared_location();
4873 Type
* ftdt
= Function_type::make_function_type_descriptor_type();
4875 const Struct_field_list
* fields
= ftdt
->struct_type()->fields();
4877 Expression_list
* vals
= new Expression_list();
4880 Struct_field_list::const_iterator p
= fields
->begin();
4881 go_assert(p
->is_field_name("_type"));
4882 vals
->push_back(this->type_descriptor_constructor(gogo
,
4883 RUNTIME_TYPE_KIND_FUNC
,
4887 go_assert(p
->is_field_name("dotdotdot"));
4888 vals
->push_back(Expression::make_boolean(this->is_varargs(), bloc
));
4891 go_assert(p
->is_field_name("in"));
4892 vals
->push_back(this->type_descriptor_params(p
->type(), this->receiver(),
4893 this->parameters()));
4896 go_assert(p
->is_field_name("out"));
4897 vals
->push_back(this->type_descriptor_params(p
->type(), NULL
,
4901 go_assert(p
== fields
->end());
4903 return Expression::make_struct_composite_literal(ftdt
, vals
, bloc
);
4906 // Return a composite literal for the parameters or results of a type
4910 Function_type::type_descriptor_params(Type
* params_type
,
4911 const Typed_identifier
* receiver
,
4912 const Typed_identifier_list
* params
)
4914 Location bloc
= Linemap::predeclared_location();
4916 if (receiver
== NULL
&& params
== NULL
)
4917 return Expression::make_slice_composite_literal(params_type
, NULL
, bloc
);
4919 Expression_list
* vals
= new Expression_list();
4920 vals
->reserve((params
== NULL
? 0 : params
->size())
4921 + (receiver
!= NULL
? 1 : 0));
4923 if (receiver
!= NULL
)
4924 vals
->push_back(Expression::make_type_descriptor(receiver
->type(), bloc
));
4928 for (Typed_identifier_list::const_iterator p
= params
->begin();
4931 vals
->push_back(Expression::make_type_descriptor(p
->type(), bloc
));
4934 return Expression::make_slice_composite_literal(params_type
, vals
, bloc
);
4937 // The reflection string.
4940 Function_type::do_reflection(Gogo
* gogo
, std::string
* ret
) const
4942 // FIXME: Turn this off until we straighten out the type of the
4943 // struct field used in a go statement which calls a method.
4944 // go_assert(this->receiver_ == NULL);
4946 ret
->append("func");
4948 if (this->receiver_
!= NULL
)
4950 ret
->push_back('(');
4951 this->append_reflection(this->receiver_
->type(), gogo
, ret
);
4952 ret
->push_back(')');
4955 ret
->push_back('(');
4956 const Typed_identifier_list
* params
= this->parameters();
4959 bool is_varargs
= this->is_varargs_
;
4960 for (Typed_identifier_list::const_iterator p
= params
->begin();
4964 if (p
!= params
->begin())
4966 if (!is_varargs
|| p
+ 1 != params
->end())
4967 this->append_reflection(p
->type(), gogo
, ret
);
4971 this->append_reflection(p
->type()->array_type()->element_type(),
4976 ret
->push_back(')');
4978 const Typed_identifier_list
* results
= this->results();
4979 if (results
!= NULL
&& !results
->empty())
4981 if (results
->size() == 1)
4982 ret
->push_back(' ');
4985 for (Typed_identifier_list::const_iterator p
= results
->begin();
4986 p
!= results
->end();
4989 if (p
!= results
->begin())
4991 this->append_reflection(p
->type(), gogo
, ret
);
4993 if (results
->size() > 1)
4994 ret
->push_back(')');
4998 // Export a function type.
5001 Function_type::do_export(Export
* exp
) const
5003 // We don't write out the receiver. The only function types which
5004 // should have a receiver are the ones associated with explicitly
5005 // defined methods. For those the receiver type is written out by
5006 // Function::export_func.
5008 exp
->write_c_string("(");
5010 if (this->parameters_
!= NULL
)
5012 bool is_varargs
= this->is_varargs_
;
5013 for (Typed_identifier_list::const_iterator p
=
5014 this->parameters_
->begin();
5015 p
!= this->parameters_
->end();
5021 exp
->write_c_string(", ");
5022 exp
->write_name(p
->name());
5023 exp
->write_c_string(" ");
5024 if (!is_varargs
|| p
+ 1 != this->parameters_
->end())
5025 exp
->write_type(p
->type());
5028 exp
->write_c_string("...");
5029 exp
->write_type(p
->type()->array_type()->element_type());
5033 exp
->write_c_string(")");
5035 const Typed_identifier_list
* results
= this->results_
;
5036 if (results
!= NULL
)
5038 exp
->write_c_string(" ");
5039 if (results
->size() == 1 && results
->begin()->name().empty())
5040 exp
->write_type(results
->begin()->type());
5044 exp
->write_c_string("(");
5045 for (Typed_identifier_list::const_iterator p
= results
->begin();
5046 p
!= results
->end();
5052 exp
->write_c_string(", ");
5053 exp
->write_name(p
->name());
5054 exp
->write_c_string(" ");
5055 exp
->write_type(p
->type());
5057 exp
->write_c_string(")");
5062 // Import a function type.
5065 Function_type::do_import(Import
* imp
)
5067 imp
->require_c_string("(");
5068 Typed_identifier_list
* parameters
;
5069 bool is_varargs
= false;
5070 if (imp
->peek_char() == ')')
5074 parameters
= new Typed_identifier_list();
5077 std::string name
= imp
->read_name();
5078 imp
->require_c_string(" ");
5080 if (imp
->match_c_string("..."))
5086 Type
* ptype
= imp
->read_type();
5088 ptype
= Type::make_array_type(ptype
, NULL
);
5089 parameters
->push_back(Typed_identifier(name
, ptype
,
5091 if (imp
->peek_char() != ',')
5093 go_assert(!is_varargs
);
5094 imp
->require_c_string(", ");
5097 imp
->require_c_string(")");
5099 Typed_identifier_list
* results
;
5100 if (imp
->peek_char() != ' ')
5105 results
= new Typed_identifier_list
;
5106 if (imp
->peek_char() != '(')
5108 Type
* rtype
= imp
->read_type();
5109 results
->push_back(Typed_identifier("", rtype
, imp
->location()));
5116 std::string name
= imp
->read_name();
5117 imp
->require_c_string(" ");
5118 Type
* rtype
= imp
->read_type();
5119 results
->push_back(Typed_identifier(name
, rtype
,
5121 if (imp
->peek_char() != ',')
5123 imp
->require_c_string(", ");
5125 imp
->require_c_string(")");
5129 Function_type
* ret
= Type::make_function_type(NULL
, parameters
, results
,
5132 ret
->set_is_varargs();
5136 // Make a copy of a function type without a receiver.
5139 Function_type::copy_without_receiver() const
5141 go_assert(this->is_method());
5142 Function_type
*ret
= Type::make_function_type(NULL
, this->parameters_
,
5145 if (this->is_varargs())
5146 ret
->set_is_varargs();
5147 if (this->is_builtin())
5148 ret
->set_is_builtin();
5152 // Make a copy of a function type with a receiver.
5155 Function_type::copy_with_receiver(Type
* receiver_type
) const
5157 go_assert(!this->is_method());
5158 Typed_identifier
* receiver
= new Typed_identifier("", receiver_type
,
5160 Function_type
* ret
= Type::make_function_type(receiver
, this->parameters_
,
5163 if (this->is_varargs_
)
5164 ret
->set_is_varargs();
5168 // Make a copy of a function type with the receiver as the first
5172 Function_type::copy_with_receiver_as_param(bool want_pointer_receiver
) const
5174 go_assert(this->is_method());
5175 Typed_identifier_list
* new_params
= new Typed_identifier_list();
5176 Type
* rtype
= this->receiver_
->type();
5177 if (want_pointer_receiver
)
5178 rtype
= Type::make_pointer_type(rtype
);
5179 Typed_identifier
receiver(this->receiver_
->name(), rtype
,
5180 this->receiver_
->location());
5181 new_params
->push_back(receiver
);
5182 const Typed_identifier_list
* orig_params
= this->parameters_
;
5183 if (orig_params
!= NULL
&& !orig_params
->empty())
5185 for (Typed_identifier_list::const_iterator p
= orig_params
->begin();
5186 p
!= orig_params
->end();
5188 new_params
->push_back(*p
);
5190 return Type::make_function_type(NULL
, new_params
, this->results_
,
5194 // Make a copy of a function type ignoring any receiver and adding a
5195 // closure parameter.
5198 Function_type::copy_with_names() const
5200 Typed_identifier_list
* new_params
= new Typed_identifier_list();
5201 const Typed_identifier_list
* orig_params
= this->parameters_
;
5202 if (orig_params
!= NULL
&& !orig_params
->empty())
5206 for (Typed_identifier_list::const_iterator p
= orig_params
->begin();
5207 p
!= orig_params
->end();
5210 snprintf(buf
, sizeof buf
, "pt.%u", count
);
5212 new_params
->push_back(Typed_identifier(buf
, p
->type(),
5217 const Typed_identifier_list
* orig_results
= this->results_
;
5218 Typed_identifier_list
* new_results
;
5219 if (orig_results
== NULL
|| orig_results
->empty())
5223 new_results
= new Typed_identifier_list();
5224 for (Typed_identifier_list::const_iterator p
= orig_results
->begin();
5225 p
!= orig_results
->end();
5227 new_results
->push_back(Typed_identifier("", p
->type(),
5231 return Type::make_function_type(NULL
, new_params
, new_results
,
5235 // Make a function type.
5238 Type::make_function_type(Typed_identifier
* receiver
,
5239 Typed_identifier_list
* parameters
,
5240 Typed_identifier_list
* results
,
5243 return new Function_type(receiver
, parameters
, results
, location
);
5246 // Make a backend function type.
5248 Backend_function_type
*
5249 Type::make_backend_function_type(Typed_identifier
* receiver
,
5250 Typed_identifier_list
* parameters
,
5251 Typed_identifier_list
* results
,
5254 return new Backend_function_type(receiver
, parameters
, results
, location
);
5257 // Class Pointer_type.
5262 Pointer_type::do_traverse(Traverse
* traverse
)
5264 return Type::traverse(this->to_type_
, traverse
);
5270 Pointer_type::do_hash_for_method(Gogo
* gogo
) const
5272 return this->to_type_
->hash_for_method(gogo
) << 4;
5275 // Get the backend representation for a pointer type.
5278 Pointer_type::do_get_backend(Gogo
* gogo
)
5280 Btype
* to_btype
= this->to_type_
->get_backend(gogo
);
5281 return gogo
->backend()->pointer_type(to_btype
);
5284 // The type of a pointer type descriptor.
5287 Pointer_type::make_pointer_type_descriptor_type()
5292 Type
* tdt
= Type::make_type_descriptor_type();
5293 Type
* ptdt
= Type::make_type_descriptor_ptr_type();
5295 Struct_type
* s
= Type::make_builtin_struct_type(2,
5299 ret
= Type::make_builtin_named_type("PtrType", s
);
5305 // The type descriptor for a pointer type.
5308 Pointer_type::do_type_descriptor(Gogo
* gogo
, Named_type
* name
)
5310 if (this->is_unsafe_pointer_type())
5312 go_assert(name
!= NULL
);
5313 return this->plain_type_descriptor(gogo
,
5314 RUNTIME_TYPE_KIND_UNSAFE_POINTER
,
5319 Location bloc
= Linemap::predeclared_location();
5321 const Methods
* methods
;
5322 Type
* deref
= this->points_to();
5323 if (deref
->named_type() != NULL
)
5324 methods
= deref
->named_type()->methods();
5325 else if (deref
->struct_type() != NULL
)
5326 methods
= deref
->struct_type()->methods();
5330 Type
* ptr_tdt
= Pointer_type::make_pointer_type_descriptor_type();
5332 const Struct_field_list
* fields
= ptr_tdt
->struct_type()->fields();
5334 Expression_list
* vals
= new Expression_list();
5337 Struct_field_list::const_iterator p
= fields
->begin();
5338 go_assert(p
->is_field_name("_type"));
5339 vals
->push_back(this->type_descriptor_constructor(gogo
,
5340 RUNTIME_TYPE_KIND_PTR
,
5341 name
, methods
, false));
5344 go_assert(p
->is_field_name("elem"));
5345 vals
->push_back(Expression::make_type_descriptor(deref
, bloc
));
5347 return Expression::make_struct_composite_literal(ptr_tdt
, vals
, bloc
);
5351 // Reflection string.
5354 Pointer_type::do_reflection(Gogo
* gogo
, std::string
* ret
) const
5356 ret
->push_back('*');
5357 this->append_reflection(this->to_type_
, gogo
, ret
);
5363 Pointer_type::do_export(Export
* exp
) const
5365 exp
->write_c_string("*");
5366 if (this->is_unsafe_pointer_type())
5367 exp
->write_c_string("any");
5369 exp
->write_type(this->to_type_
);
5375 Pointer_type::do_import(Import
* imp
)
5377 imp
->require_c_string("*");
5378 if (imp
->match_c_string("any"))
5381 return Type::make_pointer_type(Type::make_void_type());
5383 Type
* to
= imp
->read_type();
5384 return Type::make_pointer_type(to
);
5387 // Cache of pointer types. Key is "to" type, value is pointer type
5388 // that points to key.
5390 Type::Pointer_type_table
Type::pointer_types
;
5392 // A list of placeholder pointer types. We keep this so we can ensure
5393 // they are finalized.
5395 std::vector
<Pointer_type
*> Type::placeholder_pointers
;
5397 // Make a pointer type.
5400 Type::make_pointer_type(Type
* to_type
)
5402 Pointer_type_table::const_iterator p
= pointer_types
.find(to_type
);
5403 if (p
!= pointer_types
.end())
5405 Pointer_type
* ret
= new Pointer_type(to_type
);
5406 pointer_types
[to_type
] = ret
;
5410 // This helper is invoked immediately after named types have been
5411 // converted, to clean up any unresolved pointer types remaining in
5412 // the pointer type cache.
5414 // The motivation for this routine: occasionally the compiler creates
5415 // some specific pointer type as part of a lowering operation (ex:
5416 // pointer-to-void), then Type::backend_type_size() is invoked on the
5417 // type (which creates a Btype placeholder for it), that placeholder
5418 // passed somewhere along the line to the back end, but since there is
5419 // no reference to the type in user code, there is never a call to
5420 // Type::finish_backend for the type (hence the Btype remains as an
5421 // unresolved placeholder). Calling this routine will clean up such
5425 Type::finish_pointer_types(Gogo
* gogo
)
5427 // We don't use begin() and end() because it is possible to add new
5428 // placeholder pointer types as we finalized existing ones.
5429 for (size_t i
= 0; i
< Type::placeholder_pointers
.size(); i
++)
5431 Pointer_type
* pt
= Type::placeholder_pointers
[i
];
5432 Type_btypes::iterator tbti
= Type::type_btypes
.find(pt
);
5433 if (tbti
!= Type::type_btypes
.end() && tbti
->second
.is_placeholder
)
5435 pt
->finish_backend(gogo
, tbti
->second
.btype
);
5436 tbti
->second
.is_placeholder
= false;
5443 // Get the backend representation of a nil type. FIXME: Is this ever
5447 Nil_type::do_get_backend(Gogo
* gogo
)
5449 return gogo
->backend()->pointer_type(gogo
->backend()->void_type());
5452 // Make the nil type.
5455 Type::make_nil_type()
5457 static Nil_type singleton_nil_type
;
5458 return &singleton_nil_type
;
5461 // The type of a function call which returns multiple values. This is
5462 // really a struct, but we don't want to confuse a function call which
5463 // returns a struct with a function call which returns multiple
5466 class Call_multiple_result_type
: public Type
5469 Call_multiple_result_type(Call_expression
* call
)
5470 : Type(TYPE_CALL_MULTIPLE_RESULT
),
5476 do_has_pointer() const
5480 do_compare_is_identity(Gogo
*)
5484 do_get_backend(Gogo
* gogo
)
5486 go_assert(saw_errors());
5487 return gogo
->backend()->error_type();
5491 do_type_descriptor(Gogo
*, Named_type
*)
5493 go_assert(saw_errors());
5494 return Expression::make_error(Linemap::unknown_location());
5498 do_reflection(Gogo
*, std::string
*) const
5499 { go_assert(saw_errors()); }
5502 do_mangled_name(Gogo
*, std::string
*) const
5503 { go_assert(saw_errors()); }
5506 // The expression being called.
5507 Call_expression
* call_
;
5510 // Make a call result type.
5513 Type::make_call_multiple_result_type(Call_expression
* call
)
5515 return new Call_multiple_result_type(call
);
5518 // Class Struct_field.
5520 // Get the name of a field.
5523 Struct_field::field_name() const
5525 const std::string
& name(this->typed_identifier_
.name());
5530 // This is called during parsing, before anything is lowered, so
5531 // we have to be pretty careful to avoid dereferencing an
5532 // unknown type name.
5533 Type
* t
= this->typed_identifier_
.type();
5535 if (t
->classification() == Type::TYPE_POINTER
)
5538 Pointer_type
* ptype
= static_cast<Pointer_type
*>(t
);
5539 dt
= ptype
->points_to();
5541 if (dt
->forward_declaration_type() != NULL
)
5542 return dt
->forward_declaration_type()->name();
5543 else if (dt
->named_type() != NULL
)
5545 // Note that this can be an alias name.
5546 return dt
->named_type()->name();
5548 else if (t
->is_error_type() || dt
->is_error_type())
5550 static const std::string error_string
= "*error*";
5551 return error_string
;
5555 // Avoid crashing in the erroneous case where T is named but
5558 if (t
->forward_declaration_type() != NULL
)
5559 return t
->forward_declaration_type()->name();
5560 else if (t
->named_type() != NULL
)
5561 return t
->named_type()->name();
5568 // Return whether this field is named NAME.
5571 Struct_field::is_field_name(const std::string
& name
) const
5573 const std::string
& me(this->typed_identifier_
.name());
5578 Type
* t
= this->typed_identifier_
.type();
5579 if (t
->points_to() != NULL
)
5581 Named_type
* nt
= t
->named_type();
5582 if (nt
!= NULL
&& nt
->name() == name
)
5585 // This is a horrible hack caused by the fact that we don't pack
5586 // the names of builtin types. FIXME.
5587 if (!this->is_imported_
5590 && nt
->name() == Gogo::unpack_hidden_name(name
))
5597 // Return whether this field is an unexported field named NAME.
5600 Struct_field::is_unexported_field_name(Gogo
* gogo
,
5601 const std::string
& name
) const
5603 const std::string
& field_name(this->field_name());
5604 if (Gogo::is_hidden_name(field_name
)
5605 && name
== Gogo::unpack_hidden_name(field_name
)
5606 && gogo
->pack_hidden_name(name
, false) != field_name
)
5609 // Check for the name of a builtin type. This is like the test in
5610 // is_field_name, only there we return false if this->is_imported_,
5611 // and here we return true.
5612 if (this->is_imported_
&& this->is_anonymous())
5614 Type
* t
= this->typed_identifier_
.type();
5615 if (t
->points_to() != NULL
)
5617 Named_type
* nt
= t
->named_type();
5620 && nt
->name() == Gogo::unpack_hidden_name(name
))
5627 // Return whether this field is an embedded built-in type.
5630 Struct_field::is_embedded_builtin(Gogo
* gogo
) const
5632 const std::string
& name(this->field_name());
5633 // We know that a field is an embedded type if it is anonymous.
5634 // We can decide if it is a built-in type by checking to see if it is
5635 // registered globally under the field's name.
5636 // This allows us to distinguish between embedded built-in types and
5637 // embedded types that are aliases to built-in types.
5638 return (this->is_anonymous()
5639 && !Gogo::is_hidden_name(name
)
5640 && gogo
->lookup_global(name
.c_str()) != NULL
);
5643 // Class Struct_type.
5645 // A hash table used to find identical unnamed structs so that they
5646 // share method tables.
5648 Struct_type::Identical_structs
Struct_type::identical_structs
;
5650 // A hash table used to merge method sets for identical unnamed
5653 Struct_type::Struct_method_tables
Struct_type::struct_method_tables
;
5658 Struct_type::do_traverse(Traverse
* traverse
)
5660 Struct_field_list
* fields
= this->fields_
;
5663 for (Struct_field_list::iterator p
= fields
->begin();
5667 if (Type::traverse(p
->type(), traverse
) == TRAVERSE_EXIT
)
5668 return TRAVERSE_EXIT
;
5671 return TRAVERSE_CONTINUE
;
5674 // Verify that the struct type is complete and valid.
5677 Struct_type::do_verify()
5679 Struct_field_list
* fields
= this->fields_
;
5682 for (Struct_field_list::iterator p
= fields
->begin();
5686 Type
* t
= p
->type();
5687 if (p
->is_anonymous())
5689 if ((t
->named_type() != NULL
&& t
->points_to() != NULL
)
5690 || (t
->named_type() == NULL
&& t
->points_to() != NULL
5691 && t
->points_to()->points_to() != NULL
))
5693 go_error_at(p
->location(), "embedded type may not be a pointer");
5694 p
->set_type(Type::make_error_type());
5696 else if (t
->points_to() != NULL
5697 && t
->points_to()->interface_type() != NULL
)
5699 go_error_at(p
->location(),
5700 "embedded type may not be pointer to interface");
5701 p
->set_type(Type::make_error_type());
5708 // Whether this contains a pointer.
5711 Struct_type::do_has_pointer() const
5713 const Struct_field_list
* fields
= this->fields();
5716 for (Struct_field_list::const_iterator p
= fields
->begin();
5720 if (p
->type()->has_pointer())
5726 // Whether this type is identical to T.
5729 Struct_type::is_identical(const Struct_type
* t
, Cmp_tags cmp_tags
,
5730 bool errors_are_identical
) const
5732 if (this->is_struct_incomparable_
!= t
->is_struct_incomparable_
)
5734 const Struct_field_list
* fields1
= this->fields();
5735 const Struct_field_list
* fields2
= t
->fields();
5736 if (fields1
== NULL
|| fields2
== NULL
)
5737 return fields1
== fields2
;
5738 Struct_field_list::const_iterator pf2
= fields2
->begin();
5739 for (Struct_field_list::const_iterator pf1
= fields1
->begin();
5740 pf1
!= fields1
->end();
5743 if (pf2
== fields2
->end())
5745 if (pf1
->field_name() != pf2
->field_name())
5747 if (pf1
->is_anonymous() != pf2
->is_anonymous()
5748 || !Type::are_identical_cmp_tags(pf1
->type(), pf2
->type(), cmp_tags
,
5749 errors_are_identical
, NULL
))
5751 if (cmp_tags
== COMPARE_TAGS
)
5753 if (!pf1
->has_tag())
5760 if (!pf2
->has_tag())
5762 if (pf1
->tag() != pf2
->tag())
5767 if (pf2
!= fields2
->end())
5772 // Whether comparisons of this struct type are simple identity
5776 Struct_type::do_compare_is_identity(Gogo
* gogo
)
5778 const Struct_field_list
* fields
= this->fields_
;
5782 for (Struct_field_list::const_iterator pf
= fields
->begin();
5783 pf
!= fields
->end();
5786 if (Gogo::is_sink_name(pf
->field_name()))
5789 if (!pf
->type()->compare_is_identity(gogo
))
5792 int64_t field_align
;
5793 if (!pf
->type()->backend_type_align(gogo
, &field_align
))
5795 if ((offset
& (field_align
- 1)) != 0)
5797 // This struct has padding. We don't guarantee that that
5798 // padding is zero-initialized for a stack variable, so we
5799 // can't use memcmp to compare struct values.
5804 if (!pf
->type()->backend_type_size(gogo
, &field_size
))
5806 offset
+= field_size
;
5809 int64_t struct_size
;
5810 if (!this->backend_type_size(gogo
, &struct_size
))
5812 if (offset
!= struct_size
)
5814 // Trailing padding may not be zero when on the stack.
5821 // Return whether this struct type is reflexive--whether a value of
5822 // this type is always equal to itself.
5825 Struct_type::do_is_reflexive()
5827 const Struct_field_list
* fields
= this->fields_
;
5830 for (Struct_field_list::const_iterator pf
= fields
->begin();
5831 pf
!= fields
->end();
5834 if (!pf
->type()->is_reflexive())
5840 // Return whether this struct type needs a key update when used as a
5844 Struct_type::do_needs_key_update()
5846 const Struct_field_list
* fields
= this->fields_
;
5849 for (Struct_field_list::const_iterator pf
= fields
->begin();
5850 pf
!= fields
->end();
5853 if (pf
->type()->needs_key_update())
5859 // Return whether this struct type is permitted to be in the heap.
5862 Struct_type::do_in_heap()
5864 const Struct_field_list
* fields
= this->fields_
;
5867 for (Struct_field_list::const_iterator pf
= fields
->begin();
5868 pf
!= fields
->end();
5871 if (!pf
->type()->in_heap())
5877 // Build identity and hash functions for this struct.
5882 Struct_type::do_hash_for_method(Gogo
* gogo
) const
5884 unsigned int ret
= 0;
5885 if (this->fields() != NULL
)
5887 for (Struct_field_list::const_iterator pf
= this->fields()->begin();
5888 pf
!= this->fields()->end();
5890 ret
= (ret
<< 1) + pf
->type()->hash_for_method(gogo
);
5893 if (this->is_struct_incomparable_
)
5898 // Find the local field NAME.
5901 Struct_type::find_local_field(const std::string
& name
,
5902 unsigned int *pindex
) const
5904 const Struct_field_list
* fields
= this->fields_
;
5908 for (Struct_field_list::const_iterator pf
= fields
->begin();
5909 pf
!= fields
->end();
5912 if (pf
->is_field_name(name
))
5922 // Return an expression for field NAME in STRUCT_EXPR, or NULL.
5924 Field_reference_expression
*
5925 Struct_type::field_reference(Expression
* struct_expr
, const std::string
& name
,
5926 Location location
) const
5929 return this->field_reference_depth(struct_expr
, name
, location
, NULL
,
5933 // Return an expression for a field, along with the depth at which it
5936 Field_reference_expression
*
5937 Struct_type::field_reference_depth(Expression
* struct_expr
,
5938 const std::string
& name
,
5940 Saw_named_type
* saw
,
5941 unsigned int* depth
) const
5943 const Struct_field_list
* fields
= this->fields_
;
5947 // Look for a field with this name.
5949 for (Struct_field_list::const_iterator pf
= fields
->begin();
5950 pf
!= fields
->end();
5953 if (pf
->is_field_name(name
))
5956 return Expression::make_field_reference(struct_expr
, i
, location
);
5960 // Look for an anonymous field which contains a field with this
5962 unsigned int found_depth
= 0;
5963 Field_reference_expression
* ret
= NULL
;
5965 for (Struct_field_list::const_iterator pf
= fields
->begin();
5966 pf
!= fields
->end();
5969 if (!pf
->is_anonymous())
5972 Struct_type
* st
= pf
->type()->deref()->struct_type();
5976 Saw_named_type
* hold_saw
= saw
;
5977 Saw_named_type saw_here
;
5978 Named_type
* nt
= pf
->type()->named_type();
5980 nt
= pf
->type()->deref()->named_type();
5984 for (q
= saw
; q
!= NULL
; q
= q
->next
)
5988 // If this is an error, it will be reported
5995 saw_here
.next
= saw
;
6000 // Look for a reference using a NULL struct expression. If we
6001 // find one, fill in the struct expression with a reference to
6003 unsigned int subdepth
;
6004 Field_reference_expression
* sub
= st
->field_reference_depth(NULL
, name
,
6014 if (ret
== NULL
|| subdepth
< found_depth
)
6019 found_depth
= subdepth
;
6020 Expression
* here
= Expression::make_field_reference(struct_expr
, i
,
6022 if (pf
->type()->points_to() != NULL
)
6023 here
= Expression::make_dereference(here
,
6024 Expression::NIL_CHECK_DEFAULT
,
6026 while (sub
->expr() != NULL
)
6028 sub
= sub
->expr()->deref()->field_reference_expression();
6029 go_assert(sub
!= NULL
);
6031 sub
->set_struct_expression(here
);
6032 sub
->set_implicit(true);
6034 else if (subdepth
> found_depth
)
6038 // We do not handle ambiguity here--it should be handled by
6039 // Type::bind_field_or_method.
6047 *depth
= found_depth
+ 1;
6052 // Return the total number of fields, including embedded fields.
6055 Struct_type::total_field_count() const
6057 if (this->fields_
== NULL
)
6059 unsigned int ret
= 0;
6060 for (Struct_field_list::const_iterator pf
= this->fields_
->begin();
6061 pf
!= this->fields_
->end();
6064 if (!pf
->is_anonymous() || pf
->type()->struct_type() == NULL
)
6067 ret
+= pf
->type()->struct_type()->total_field_count();
6072 // Return whether NAME is an unexported field, for better error reporting.
6075 Struct_type::is_unexported_local_field(Gogo
* gogo
,
6076 const std::string
& name
) const
6078 const Struct_field_list
* fields
= this->fields_
;
6081 for (Struct_field_list::const_iterator pf
= fields
->begin();
6082 pf
!= fields
->end();
6084 if (pf
->is_unexported_field_name(gogo
, name
))
6090 // Finalize the methods of an unnamed struct.
6093 Struct_type::finalize_methods(Gogo
* gogo
)
6095 if (this->all_methods_
!= NULL
)
6098 // It is possible to have multiple identical structs that have
6099 // methods. We want them to share method tables. Otherwise we will
6100 // emit identical methods more than once, which is bad since they
6101 // will even have the same names.
6102 std::pair
<Identical_structs::iterator
, bool> ins
=
6103 Struct_type::identical_structs
.insert(std::make_pair(this, this));
6106 // An identical struct was already entered into the hash table.
6107 // Note that finalize_methods is, fortunately, not recursive.
6108 this->all_methods_
= ins
.first
->second
->all_methods_
;
6112 Type::finalize_methods(gogo
, this, this->location_
, &this->all_methods_
);
6115 // Return the method NAME, or NULL if there isn't one or if it is
6116 // ambiguous. Set *IS_AMBIGUOUS if the method exists but is
6120 Struct_type::method_function(const std::string
& name
, bool* is_ambiguous
) const
6122 return Type::method_function(this->all_methods_
, name
, is_ambiguous
);
6125 // Return a pointer to the interface method table for this type for
6126 // the interface INTERFACE. IS_POINTER is true if this is for a
6130 Struct_type::interface_method_table(Interface_type
* interface
,
6133 std::pair
<Struct_type
*, Struct_type::Struct_method_table_pair
*>
6135 std::pair
<Struct_type::Struct_method_tables::iterator
, bool> ins
=
6136 Struct_type::struct_method_tables
.insert(val
);
6138 Struct_method_table_pair
* smtp
;
6140 smtp
= ins
.first
->second
;
6143 smtp
= new Struct_method_table_pair();
6145 smtp
->second
= NULL
;
6146 ins
.first
->second
= smtp
;
6149 return Type::interface_method_table(this, interface
, is_pointer
,
6150 &smtp
->first
, &smtp
->second
);
6153 // Convert struct fields to the backend representation. This is not
6154 // declared in types.h so that types.h doesn't have to #include
6158 get_backend_struct_fields(Gogo
* gogo
, const Struct_field_list
* fields
,
6159 bool use_placeholder
,
6160 std::vector
<Backend::Btyped_identifier
>* bfields
)
6162 bfields
->resize(fields
->size());
6164 for (Struct_field_list::const_iterator p
= fields
->begin();
6168 (*bfields
)[i
].name
= Gogo::unpack_hidden_name(p
->field_name());
6169 (*bfields
)[i
].btype
= (use_placeholder
6170 ? p
->type()->get_backend_placeholder(gogo
)
6171 : p
->type()->get_backend(gogo
));
6172 (*bfields
)[i
].location
= p
->location();
6174 go_assert(i
== fields
->size());
6177 // Get the backend representation for a struct type.
6180 Struct_type::do_get_backend(Gogo
* gogo
)
6182 std::vector
<Backend::Btyped_identifier
> bfields
;
6183 get_backend_struct_fields(gogo
, this->fields_
, false, &bfields
);
6184 return gogo
->backend()->struct_type(bfields
);
6187 // Finish the backend representation of the fields of a struct.
6190 Struct_type::finish_backend_fields(Gogo
* gogo
)
6192 const Struct_field_list
* fields
= this->fields_
;
6195 for (Struct_field_list::const_iterator p
= fields
->begin();
6198 p
->type()->get_backend(gogo
);
6202 // The type of a struct type descriptor.
6205 Struct_type::make_struct_type_descriptor_type()
6210 Type
* tdt
= Type::make_type_descriptor_type();
6211 Type
* ptdt
= Type::make_type_descriptor_ptr_type();
6213 Type
* uintptr_type
= Type::lookup_integer_type("uintptr");
6214 Type
* string_type
= Type::lookup_string_type();
6215 Type
* pointer_string_type
= Type::make_pointer_type(string_type
);
6218 Type::make_builtin_struct_type(5,
6219 "name", pointer_string_type
,
6220 "pkgPath", pointer_string_type
,
6222 "tag", pointer_string_type
,
6223 "offsetAnon", uintptr_type
);
6224 Type
* nsf
= Type::make_builtin_named_type("structField", sf
);
6226 Type
* slice_type
= Type::make_array_type(nsf
, NULL
);
6228 Struct_type
* s
= Type::make_builtin_struct_type(2,
6230 "fields", slice_type
);
6232 ret
= Type::make_builtin_named_type("StructType", s
);
6238 // Build a type descriptor for a struct type.
6241 Struct_type::do_type_descriptor(Gogo
* gogo
, Named_type
* name
)
6243 Location bloc
= Linemap::predeclared_location();
6245 Type
* stdt
= Struct_type::make_struct_type_descriptor_type();
6247 const Struct_field_list
* fields
= stdt
->struct_type()->fields();
6249 Expression_list
* vals
= new Expression_list();
6252 const Methods
* methods
= this->methods();
6253 // A named struct should not have methods--the methods should attach
6254 // to the named type.
6255 go_assert(methods
== NULL
|| name
== NULL
);
6257 Struct_field_list::const_iterator ps
= fields
->begin();
6258 go_assert(ps
->is_field_name("_type"));
6259 vals
->push_back(this->type_descriptor_constructor(gogo
,
6260 RUNTIME_TYPE_KIND_STRUCT
,
6261 name
, methods
, true));
6264 go_assert(ps
->is_field_name("fields"));
6266 Expression_list
* elements
= new Expression_list();
6267 elements
->reserve(this->fields_
->size());
6268 Type
* element_type
= ps
->type()->array_type()->element_type();
6269 for (Struct_field_list::const_iterator pf
= this->fields_
->begin();
6270 pf
!= this->fields_
->end();
6273 const Struct_field_list
* f
= element_type
->struct_type()->fields();
6275 Expression_list
* fvals
= new Expression_list();
6278 Struct_field_list::const_iterator q
= f
->begin();
6279 go_assert(q
->is_field_name("name"));
6280 std::string n
= Gogo::unpack_hidden_name(pf
->field_name());
6281 Expression
* s
= Expression::make_string(n
, bloc
);
6282 fvals
->push_back(Expression::make_unary(OPERATOR_AND
, s
, bloc
));
6285 go_assert(q
->is_field_name("pkgPath"));
6286 bool is_embedded_builtin
= pf
->is_embedded_builtin(gogo
);
6287 if (!Gogo::is_hidden_name(pf
->field_name()) && !is_embedded_builtin
)
6288 fvals
->push_back(Expression::make_nil(bloc
));
6292 if (is_embedded_builtin
)
6293 n
= gogo
->package_name();
6295 n
= Gogo::hidden_name_pkgpath(pf
->field_name());
6296 Expression
* s
= Expression::make_string(n
, bloc
);
6297 fvals
->push_back(Expression::make_unary(OPERATOR_AND
, s
, bloc
));
6301 go_assert(q
->is_field_name("typ"));
6302 fvals
->push_back(Expression::make_type_descriptor(pf
->type(), bloc
));
6305 go_assert(q
->is_field_name("tag"));
6307 fvals
->push_back(Expression::make_nil(bloc
));
6310 Expression
* s
= Expression::make_string(pf
->tag(), bloc
);
6311 fvals
->push_back(Expression::make_unary(OPERATOR_AND
, s
, bloc
));
6315 go_assert(q
->is_field_name("offsetAnon"));
6316 Type
* uintptr_type
= Type::lookup_integer_type("uintptr");
6317 Expression
* o
= Expression::make_struct_field_offset(this, &*pf
);
6318 Expression
* one
= Expression::make_integer_ul(1, uintptr_type
, bloc
);
6319 o
= Expression::make_binary(OPERATOR_LSHIFT
, o
, one
, bloc
);
6320 int av
= pf
->is_anonymous() ? 1 : 0;
6321 Expression
* anon
= Expression::make_integer_ul(av
, uintptr_type
, bloc
);
6322 o
= Expression::make_binary(OPERATOR_OR
, o
, anon
, bloc
);
6323 fvals
->push_back(o
);
6325 Expression
* v
= Expression::make_struct_composite_literal(element_type
,
6327 elements
->push_back(v
);
6330 vals
->push_back(Expression::make_slice_composite_literal(ps
->type(),
6333 return Expression::make_struct_composite_literal(stdt
, vals
, bloc
);
6336 // Write the hash function for a struct which can not use the identity
6340 Struct_type::write_hash_function(Gogo
* gogo
, Named_type
*,
6341 Function_type
* hash_fntype
,
6342 Function_type
* equal_fntype
)
6344 Location bloc
= Linemap::predeclared_location();
6346 // The pointer to the struct that we are going to hash. This is an
6347 // argument to the hash function we are implementing here.
6348 Named_object
* key_arg
= gogo
->lookup("key", NULL
);
6349 go_assert(key_arg
!= NULL
);
6350 Type
* key_arg_type
= key_arg
->var_value()->type();
6352 // The seed argument to the hash function.
6353 Named_object
* seed_arg
= gogo
->lookup("seed", NULL
);
6354 go_assert(seed_arg
!= NULL
);
6356 Type
* uintptr_type
= Type::lookup_integer_type("uintptr");
6358 // Make a temporary to hold the return value, initialized to the seed.
6359 Expression
* ref
= Expression::make_var_reference(seed_arg
, bloc
);
6360 Temporary_statement
* retval
= Statement::make_temporary(uintptr_type
, ref
,
6362 gogo
->add_statement(retval
);
6364 // Make a temporary to hold the key as a uintptr.
6365 ref
= Expression::make_var_reference(key_arg
, bloc
);
6366 ref
= Expression::make_cast(uintptr_type
, ref
, bloc
);
6367 Temporary_statement
* key
= Statement::make_temporary(uintptr_type
, ref
,
6369 gogo
->add_statement(key
);
6371 // Loop over the struct fields.
6372 const Struct_field_list
* fields
= this->fields_
;
6373 for (Struct_field_list::const_iterator pf
= fields
->begin();
6374 pf
!= fields
->end();
6377 if (Gogo::is_sink_name(pf
->field_name()))
6380 // Get a pointer to the value of this field.
6381 Expression
* offset
= Expression::make_struct_field_offset(this, &*pf
);
6382 ref
= Expression::make_temporary_reference(key
, bloc
);
6383 Expression
* subkey
= Expression::make_binary(OPERATOR_PLUS
, ref
, offset
,
6385 subkey
= Expression::make_cast(key_arg_type
, subkey
, bloc
);
6387 // Get the hash function to use for the type of this field.
6388 Named_object
* hash_fn
;
6389 Named_object
* equal_fn
;
6390 pf
->type()->type_functions(gogo
, pf
->type()->named_type(), hash_fntype
,
6391 equal_fntype
, &hash_fn
, &equal_fn
);
6393 // Call the hash function for the field, passing retval as the seed.
6394 ref
= Expression::make_temporary_reference(retval
, bloc
);
6395 Expression_list
* args
= new Expression_list();
6396 args
->push_back(subkey
);
6397 args
->push_back(ref
);
6398 Expression
* func
= Expression::make_func_reference(hash_fn
, NULL
, bloc
);
6399 Expression
* call
= Expression::make_call(func
, args
, false, bloc
);
6401 // Set retval to the result.
6402 Temporary_reference_expression
* tref
=
6403 Expression::make_temporary_reference(retval
, bloc
);
6404 tref
->set_is_lvalue();
6405 Statement
* s
= Statement::make_assignment(tref
, call
, bloc
);
6406 gogo
->add_statement(s
);
6409 // Return retval to the caller of the hash function.
6410 Expression_list
* vals
= new Expression_list();
6411 ref
= Expression::make_temporary_reference(retval
, bloc
);
6412 vals
->push_back(ref
);
6413 Statement
* s
= Statement::make_return_statement(vals
, bloc
);
6414 gogo
->add_statement(s
);
6417 // Write the equality function for a struct which can not use the
6418 // identity function.
6421 Struct_type::write_equal_function(Gogo
* gogo
, Named_type
* name
)
6423 Location bloc
= Linemap::predeclared_location();
6425 // The pointers to the structs we are going to compare.
6426 Named_object
* key1_arg
= gogo
->lookup("key1", NULL
);
6427 Named_object
* key2_arg
= gogo
->lookup("key2", NULL
);
6428 go_assert(key1_arg
!= NULL
&& key2_arg
!= NULL
);
6430 // Build temporaries with the right types.
6431 Type
* pt
= Type::make_pointer_type(name
!= NULL
6432 ? static_cast<Type
*>(name
)
6433 : static_cast<Type
*>(this));
6435 Expression
* ref
= Expression::make_var_reference(key1_arg
, bloc
);
6436 ref
= Expression::make_unsafe_cast(pt
, ref
, bloc
);
6437 Temporary_statement
* p1
= Statement::make_temporary(pt
, ref
, bloc
);
6438 gogo
->add_statement(p1
);
6440 ref
= Expression::make_var_reference(key2_arg
, bloc
);
6441 ref
= Expression::make_unsafe_cast(pt
, ref
, bloc
);
6442 Temporary_statement
* p2
= Statement::make_temporary(pt
, ref
, bloc
);
6443 gogo
->add_statement(p2
);
6445 const Struct_field_list
* fields
= this->fields_
;
6446 unsigned int field_index
= 0;
6447 for (Struct_field_list::const_iterator pf
= fields
->begin();
6448 pf
!= fields
->end();
6449 ++pf
, ++field_index
)
6451 if (Gogo::is_sink_name(pf
->field_name()))
6454 // Compare one field in both P1 and P2.
6455 Expression
* f1
= Expression::make_temporary_reference(p1
, bloc
);
6456 f1
= Expression::make_dereference(f1
, Expression::NIL_CHECK_DEFAULT
,
6458 f1
= Expression::make_field_reference(f1
, field_index
, bloc
);
6460 Expression
* f2
= Expression::make_temporary_reference(p2
, bloc
);
6461 f2
= Expression::make_dereference(f2
, Expression::NIL_CHECK_DEFAULT
,
6463 f2
= Expression::make_field_reference(f2
, field_index
, bloc
);
6465 Expression
* cond
= Expression::make_binary(OPERATOR_NOTEQ
, f1
, f2
, bloc
);
6467 // If the values are not equal, return false.
6468 gogo
->start_block(bloc
);
6469 Expression_list
* vals
= new Expression_list();
6470 vals
->push_back(Expression::make_boolean(false, bloc
));
6471 Statement
* s
= Statement::make_return_statement(vals
, bloc
);
6472 gogo
->add_statement(s
);
6473 Block
* then_block
= gogo
->finish_block(bloc
);
6475 s
= Statement::make_if_statement(cond
, then_block
, NULL
, bloc
);
6476 gogo
->add_statement(s
);
6479 // All the fields are equal, so return true.
6480 Expression_list
* vals
= new Expression_list();
6481 vals
->push_back(Expression::make_boolean(true, bloc
));
6482 Statement
* s
= Statement::make_return_statement(vals
, bloc
);
6483 gogo
->add_statement(s
);
6486 // Reflection string.
6489 Struct_type::do_reflection(Gogo
* gogo
, std::string
* ret
) const
6491 ret
->append("struct {");
6493 for (Struct_field_list::const_iterator p
= this->fields_
->begin();
6494 p
!= this->fields_
->end();
6497 if (p
!= this->fields_
->begin())
6498 ret
->push_back(';');
6499 ret
->push_back(' ');
6500 if (!p
->is_anonymous())
6502 ret
->append(Gogo::unpack_hidden_name(p
->field_name()));
6503 ret
->push_back(' ');
6505 if (p
->is_anonymous()
6506 && p
->type()->named_type() != NULL
6507 && p
->type()->named_type()->is_alias())
6508 p
->type()->named_type()->append_reflection_type_name(gogo
, true, ret
);
6510 this->append_reflection(p
->type(), gogo
, ret
);
6514 const std::string
& tag(p
->tag());
6516 for (std::string::const_iterator p
= tag
.begin();
6521 ret
->append("\\x00");
6522 else if (*p
== '\n')
6524 else if (*p
== '\t')
6527 ret
->append("\\\"");
6528 else if (*p
== '\\')
6529 ret
->append("\\\\");
6533 ret
->push_back('"');
6537 if (!this->fields_
->empty())
6538 ret
->push_back(' ');
6540 ret
->push_back('}');
6543 // If the offset of field INDEX in the backend implementation can be
6544 // determined, set *POFFSET to the offset in bytes and return true.
6545 // Otherwise, return false.
6548 Struct_type::backend_field_offset(Gogo
* gogo
, unsigned int index
,
6551 if (!this->is_backend_type_size_known(gogo
))
6553 Btype
* bt
= this->get_backend_placeholder(gogo
);
6554 *poffset
= gogo
->backend()->type_field_offset(bt
, index
);
6561 Struct_type::do_export(Export
* exp
) const
6563 exp
->write_c_string("struct { ");
6564 const Struct_field_list
* fields
= this->fields_
;
6565 go_assert(fields
!= NULL
);
6566 for (Struct_field_list::const_iterator p
= fields
->begin();
6570 if (p
->is_anonymous())
6571 exp
->write_string("? ");
6574 exp
->write_string(p
->field_name());
6575 exp
->write_c_string(" ");
6577 exp
->write_type(p
->type());
6581 exp
->write_c_string(" ");
6583 Expression::make_string(p
->tag(), Linemap::predeclared_location());
6584 expr
->export_expression(exp
);
6588 exp
->write_c_string("; ");
6590 exp
->write_c_string("}");
6596 Struct_type::do_import(Import
* imp
)
6598 imp
->require_c_string("struct { ");
6599 Struct_field_list
* fields
= new Struct_field_list
;
6600 if (imp
->peek_char() != '}')
6605 if (imp
->match_c_string("? "))
6609 name
= imp
->read_identifier();
6610 imp
->require_c_string(" ");
6612 Type
* ftype
= imp
->read_type();
6614 Struct_field
sf(Typed_identifier(name
, ftype
, imp
->location()));
6615 sf
.set_is_imported();
6617 if (imp
->peek_char() == ' ')
6620 Expression
* expr
= Expression::import_expression(imp
);
6621 String_expression
* sexpr
= expr
->string_expression();
6622 go_assert(sexpr
!= NULL
);
6623 sf
.set_tag(sexpr
->val());
6627 imp
->require_c_string("; ");
6628 fields
->push_back(sf
);
6629 if (imp
->peek_char() == '}')
6633 imp
->require_c_string("}");
6635 return Type::make_struct_type(fields
, imp
->location());
6638 // Whether we can write this struct type to a C header file.
6639 // We can't if any of the fields are structs defined in a different package.
6642 Struct_type::can_write_to_c_header(
6643 std::vector
<const Named_object
*>* requires
,
6644 std::vector
<const Named_object
*>* declare
) const
6646 const Struct_field_list
* fields
= this->fields_
;
6647 if (fields
== NULL
|| fields
->empty())
6650 for (Struct_field_list::const_iterator p
= fields
->begin();
6654 if (p
->is_anonymous())
6656 if (!this->can_write_type_to_c_header(p
->type(), requires
, declare
))
6658 if (Gogo::message_name(p
->field_name()) == "_")
6666 // Whether we can write the type T to a C header file.
6669 Struct_type::can_write_type_to_c_header(
6671 std::vector
<const Named_object
*>* requires
,
6672 std::vector
<const Named_object
*>* declare
) const
6675 switch (t
->classification())
6690 case TYPE_INTERFACE
:
6694 // Don't try to handle a pointer to an array.
6695 if (t
->points_to()->array_type() != NULL
6696 && !t
->points_to()->is_slice_type())
6699 if (t
->points_to()->named_type() != NULL
6700 && t
->points_to()->struct_type() != NULL
)
6701 declare
->push_back(t
->points_to()->named_type()->named_object());
6705 return t
->struct_type()->can_write_to_c_header(requires
, declare
);
6708 if (t
->is_slice_type())
6710 return this->can_write_type_to_c_header(t
->array_type()->element_type(),
6715 const Named_object
* no
= t
->named_type()->named_object();
6716 if (no
->package() != NULL
)
6718 if (t
->is_unsafe_pointer_type())
6722 if (t
->struct_type() != NULL
)
6724 requires
->push_back(no
);
6725 return t
->struct_type()->can_write_to_c_header(requires
, declare
);
6727 return this->can_write_type_to_c_header(t
->base(), requires
, declare
);
6730 case TYPE_CALL_MULTIPLE_RESULT
:
6738 // Write this struct to a C header file.
6741 Struct_type::write_to_c_header(std::ostream
& os
) const
6743 const Struct_field_list
* fields
= this->fields_
;
6744 for (Struct_field_list::const_iterator p
= fields
->begin();
6749 this->write_field_to_c_header(os
, p
->field_name(), p
->type());
6750 os
<< ';' << std::endl
;
6754 // Write the type of a struct field to a C header file.
6757 Struct_type::write_field_to_c_header(std::ostream
& os
, const std::string
& name
,
6758 const Type
*t
) const
6760 bool print_name
= true;
6762 switch (t
->classification())
6774 const Integer_type
* it
= t
->integer_type();
6775 if (it
->is_unsigned())
6777 os
<< "int" << it
->bits() << "_t";
6782 switch (t
->float_type()->bits())
6796 switch (t
->complex_type()->bits())
6799 os
<< "float _Complex";
6802 os
<< "double _Complex";
6819 std::vector
<const Named_object
*> requires
;
6820 std::vector
<const Named_object
*> declare
;
6821 if (!this->can_write_type_to_c_header(t
->points_to(), &requires
,
6826 this->write_field_to_c_header(os
, "", t
->points_to());
6840 case TYPE_INTERFACE
:
6841 if (t
->interface_type()->is_empty())
6848 os
<< "struct {" << std::endl
;
6849 t
->struct_type()->write_to_c_header(os
);
6854 if (t
->is_slice_type())
6858 const Type
*ele
= t
;
6859 std::vector
<const Type
*> array_types
;
6860 while (ele
->array_type() != NULL
&& !ele
->is_slice_type())
6862 array_types
.push_back(ele
);
6863 ele
= ele
->array_type()->element_type();
6865 this->write_field_to_c_header(os
, "", ele
);
6866 os
<< ' ' << Gogo::message_name(name
);
6868 while (!array_types
.empty())
6870 ele
= array_types
.back();
6871 array_types
.pop_back();
6873 Numeric_constant nc
;
6874 if (!ele
->array_type()->length()->numeric_constant_value(&nc
))
6877 if (!nc
.to_int(&val
))
6879 char* s
= mpz_get_str(NULL
, 10, val
);
6890 const Named_object
* no
= t
->named_type()->named_object();
6891 if (t
->struct_type() != NULL
)
6892 os
<< "struct " << no
->message_name();
6893 else if (t
->is_unsafe_pointer_type())
6895 else if (t
== Type::lookup_integer_type("uintptr"))
6899 this->write_field_to_c_header(os
, name
, t
->base());
6907 case TYPE_CALL_MULTIPLE_RESULT
:
6914 if (print_name
&& !name
.empty())
6915 os
<< ' ' << Gogo::message_name(name
);
6918 // Make a struct type.
6921 Type::make_struct_type(Struct_field_list
* fields
,
6924 return new Struct_type(fields
, location
);
6927 // Class Array_type.
6929 // Store the length of an array as an int64_t into *PLEN. Return
6930 // false if the length can not be determined. This will assert if
6931 // called for a slice.
6934 Array_type::int_length(int64_t* plen
)
6936 go_assert(this->length_
!= NULL
);
6937 Numeric_constant nc
;
6938 if (!this->length_
->numeric_constant_value(&nc
))
6940 return nc
.to_memory_size(plen
);
6943 // Whether two array types are identical.
6946 Array_type::is_identical(const Array_type
* t
, Cmp_tags cmp_tags
,
6947 bool errors_are_identical
) const
6949 if (!Type::are_identical_cmp_tags(this->element_type(), t
->element_type(),
6950 cmp_tags
, errors_are_identical
, NULL
))
6953 if (this->is_array_incomparable_
!= t
->is_array_incomparable_
)
6956 Expression
* l1
= this->length();
6957 Expression
* l2
= t
->length();
6959 // Slices of the same element type are identical.
6960 if (l1
== NULL
&& l2
== NULL
)
6963 // Arrays of the same element type are identical if they have the
6965 if (l1
!= NULL
&& l2
!= NULL
)
6970 // Try to determine the lengths. If we can't, assume the arrays
6971 // are not identical.
6973 Numeric_constant nc1
, nc2
;
6974 if (l1
->numeric_constant_value(&nc1
)
6975 && l2
->numeric_constant_value(&nc2
))
6978 if (nc1
.to_int(&v1
))
6981 if (nc2
.to_int(&v2
))
6983 ret
= mpz_cmp(v1
, v2
) == 0;
6992 // Otherwise the arrays are not identical.
6999 Array_type::do_traverse(Traverse
* traverse
)
7001 if (Type::traverse(this->element_type_
, traverse
) == TRAVERSE_EXIT
)
7002 return TRAVERSE_EXIT
;
7003 if (this->length_
!= NULL
7004 && Expression::traverse(&this->length_
, traverse
) == TRAVERSE_EXIT
)
7005 return TRAVERSE_EXIT
;
7006 return TRAVERSE_CONTINUE
;
7009 // Check that the length is valid.
7012 Array_type::verify_length()
7014 if (this->length_
== NULL
)
7017 Type_context
context(Type::lookup_integer_type("int"), false);
7018 this->length_
->determine_type(&context
);
7020 if (!this->length_
->is_constant())
7022 go_error_at(this->length_
->location(), "array bound is not constant");
7026 // For array types, the length expression can be an untyped constant
7027 // representable as an int, but we don't allow explicitly non-integer
7028 // values such as "float64(10)". See issues #13485 and #13486.
7029 if (this->length_
->type()->integer_type() == NULL
7030 && !this->length_
->type()->is_error_type())
7032 go_error_at(this->length_
->location(), "invalid array bound");
7036 Numeric_constant nc
;
7037 if (!this->length_
->numeric_constant_value(&nc
))
7039 if (this->length_
->type()->integer_type() != NULL
7040 || this->length_
->type()->float_type() != NULL
)
7041 go_error_at(this->length_
->location(), "array bound is not constant");
7043 go_error_at(this->length_
->location(), "array bound is not numeric");
7047 Type
* int_type
= Type::lookup_integer_type("int");
7048 unsigned int tbits
= int_type
->integer_type()->bits();
7050 switch (nc
.to_unsigned_long(&val
))
7052 case Numeric_constant::NC_UL_VALID
:
7053 if (sizeof(val
) >= tbits
/ 8 && val
>> (tbits
- 1) != 0)
7055 go_error_at(this->length_
->location(), "array bound overflows");
7059 case Numeric_constant::NC_UL_NOTINT
:
7060 go_error_at(this->length_
->location(), "array bound truncated to integer");
7062 case Numeric_constant::NC_UL_NEGATIVE
:
7063 go_error_at(this->length_
->location(), "negative array bound");
7065 case Numeric_constant::NC_UL_BIG
:
7068 if (!nc
.to_int(&val
))
7070 unsigned int bits
= mpz_sizeinbase(val
, 2);
7074 go_error_at(this->length_
->location(), "array bound overflows");
7089 Array_type::do_verify()
7091 if (this->element_type()->is_error_type())
7093 if (!this->verify_length())
7094 this->length_
= Expression::make_error(this->length_
->location());
7098 // Whether the type contains pointers. This is always true for a
7099 // slice. For an array it is true if the element type has pointers
7100 // and the length is greater than zero.
7103 Array_type::do_has_pointer() const
7105 if (this->length_
== NULL
)
7107 if (!this->element_type_
->has_pointer())
7110 Numeric_constant nc
;
7111 if (!this->length_
->numeric_constant_value(&nc
))
7113 // Error reported elsewhere.
7118 switch (nc
.to_unsigned_long(&val
))
7120 case Numeric_constant::NC_UL_VALID
:
7122 case Numeric_constant::NC_UL_BIG
:
7125 // Error reported elsewhere.
7130 // Whether we can use memcmp to compare this array.
7133 Array_type::do_compare_is_identity(Gogo
* gogo
)
7135 if (this->length_
== NULL
)
7138 // Check for [...], which indicates that this is not a real type.
7139 if (this->length_
->is_nil_expression())
7142 if (!this->element_type_
->compare_is_identity(gogo
))
7145 // If there is any padding, then we can't use memcmp.
7148 if (!this->element_type_
->backend_type_size(gogo
, &size
)
7149 || !this->element_type_
->backend_type_align(gogo
, &align
))
7151 if ((size
& (align
- 1)) != 0)
7157 // Array type hash code.
7160 Array_type::do_hash_for_method(Gogo
* gogo
) const
7164 // There is no very convenient way to get a hash code for the
7166 ret
= this->element_type_
->hash_for_method(gogo
) + 1;
7167 if (this->is_array_incomparable_
)
7172 // Write the hash function for an array which can not use the identify
7176 Array_type::write_hash_function(Gogo
* gogo
, Named_type
* name
,
7177 Function_type
* hash_fntype
,
7178 Function_type
* equal_fntype
)
7180 Location bloc
= Linemap::predeclared_location();
7182 // The pointer to the array that we are going to hash. This is an
7183 // argument to the hash function we are implementing here.
7184 Named_object
* key_arg
= gogo
->lookup("key", NULL
);
7185 go_assert(key_arg
!= NULL
);
7186 Type
* key_arg_type
= key_arg
->var_value()->type();
7188 // The seed argument to the hash function.
7189 Named_object
* seed_arg
= gogo
->lookup("seed", NULL
);
7190 go_assert(seed_arg
!= NULL
);
7192 Type
* uintptr_type
= Type::lookup_integer_type("uintptr");
7194 // Make a temporary to hold the return value, initialized to the seed.
7195 Expression
* ref
= Expression::make_var_reference(seed_arg
, bloc
);
7196 Temporary_statement
* retval
= Statement::make_temporary(uintptr_type
, ref
,
7198 gogo
->add_statement(retval
);
7200 // Make a temporary to hold the key as a uintptr.
7201 ref
= Expression::make_var_reference(key_arg
, bloc
);
7202 ref
= Expression::make_cast(uintptr_type
, ref
, bloc
);
7203 Temporary_statement
* key
= Statement::make_temporary(uintptr_type
, ref
,
7205 gogo
->add_statement(key
);
7207 // Loop over the array elements.
7209 Type
* int_type
= Type::lookup_integer_type("int");
7210 Temporary_statement
* index
= Statement::make_temporary(int_type
, NULL
, bloc
);
7211 gogo
->add_statement(index
);
7213 Expression
* iref
= Expression::make_temporary_reference(index
, bloc
);
7214 Expression
* aref
= Expression::make_var_reference(key_arg
, bloc
);
7215 Type
* pt
= Type::make_pointer_type(name
!= NULL
7216 ? static_cast<Type
*>(name
)
7217 : static_cast<Type
*>(this));
7218 aref
= Expression::make_cast(pt
, aref
, bloc
);
7219 For_range_statement
* for_range
= Statement::make_for_range_statement(iref
,
7224 gogo
->start_block(bloc
);
7226 // Get the hash function for the element type.
7227 Named_object
* hash_fn
;
7228 Named_object
* equal_fn
;
7229 this->element_type_
->type_functions(gogo
, this->element_type_
->named_type(),
7230 hash_fntype
, equal_fntype
, &hash_fn
,
7233 // Get a pointer to this element in the loop.
7234 Expression
* subkey
= Expression::make_temporary_reference(key
, bloc
);
7235 subkey
= Expression::make_cast(key_arg_type
, subkey
, bloc
);
7237 // Get the size of each element.
7238 Expression
* ele_size
= Expression::make_type_info(this->element_type_
,
7239 Expression::TYPE_INFO_SIZE
);
7241 // Get the hash of this element, passing retval as the seed.
7242 ref
= Expression::make_temporary_reference(retval
, bloc
);
7243 Expression_list
* args
= new Expression_list();
7244 args
->push_back(subkey
);
7245 args
->push_back(ref
);
7246 Expression
* func
= Expression::make_func_reference(hash_fn
, NULL
, bloc
);
7247 Expression
* call
= Expression::make_call(func
, args
, false, bloc
);
7249 // Set retval to the result.
7250 Temporary_reference_expression
* tref
=
7251 Expression::make_temporary_reference(retval
, bloc
);
7252 tref
->set_is_lvalue();
7253 Statement
* s
= Statement::make_assignment(tref
, call
, bloc
);
7254 gogo
->add_statement(s
);
7256 // Increase the element pointer.
7257 tref
= Expression::make_temporary_reference(key
, bloc
);
7258 tref
->set_is_lvalue();
7259 s
= Statement::make_assignment_operation(OPERATOR_PLUSEQ
, tref
, ele_size
,
7261 Block
* statements
= gogo
->finish_block(bloc
);
7263 for_range
->add_statements(statements
);
7264 gogo
->add_statement(for_range
);
7266 // Return retval to the caller of the hash function.
7267 Expression_list
* vals
= new Expression_list();
7268 ref
= Expression::make_temporary_reference(retval
, bloc
);
7269 vals
->push_back(ref
);
7270 s
= Statement::make_return_statement(vals
, bloc
);
7271 gogo
->add_statement(s
);
7274 // Write the equality function for an array which can not use the
7275 // identity function.
7278 Array_type::write_equal_function(Gogo
* gogo
, Named_type
* name
)
7280 Location bloc
= Linemap::predeclared_location();
7282 // The pointers to the arrays we are going to compare.
7283 Named_object
* key1_arg
= gogo
->lookup("key1", NULL
);
7284 Named_object
* key2_arg
= gogo
->lookup("key2", NULL
);
7285 go_assert(key1_arg
!= NULL
&& key2_arg
!= NULL
);
7287 // Build temporaries for the keys with the right types.
7288 Type
* pt
= Type::make_pointer_type(name
!= NULL
7289 ? static_cast<Type
*>(name
)
7290 : static_cast<Type
*>(this));
7292 Expression
* ref
= Expression::make_var_reference(key1_arg
, bloc
);
7293 ref
= Expression::make_unsafe_cast(pt
, ref
, bloc
);
7294 Temporary_statement
* p1
= Statement::make_temporary(pt
, ref
, bloc
);
7295 gogo
->add_statement(p1
);
7297 ref
= Expression::make_var_reference(key2_arg
, bloc
);
7298 ref
= Expression::make_unsafe_cast(pt
, ref
, bloc
);
7299 Temporary_statement
* p2
= Statement::make_temporary(pt
, ref
, bloc
);
7300 gogo
->add_statement(p2
);
7302 // Loop over the array elements.
7304 Type
* int_type
= Type::lookup_integer_type("int");
7305 Temporary_statement
* index
= Statement::make_temporary(int_type
, NULL
, bloc
);
7306 gogo
->add_statement(index
);
7308 Expression
* iref
= Expression::make_temporary_reference(index
, bloc
);
7309 Expression
* aref
= Expression::make_temporary_reference(p1
, bloc
);
7310 For_range_statement
* for_range
= Statement::make_for_range_statement(iref
,
7315 gogo
->start_block(bloc
);
7317 // Compare element in P1 and P2.
7318 Expression
* e1
= Expression::make_temporary_reference(p1
, bloc
);
7319 e1
= Expression::make_dereference(e1
, Expression::NIL_CHECK_DEFAULT
, bloc
);
7320 ref
= Expression::make_temporary_reference(index
, bloc
);
7321 e1
= Expression::make_array_index(e1
, ref
, NULL
, NULL
, bloc
);
7323 Expression
* e2
= Expression::make_temporary_reference(p2
, bloc
);
7324 e2
= Expression::make_dereference(e2
, Expression::NIL_CHECK_DEFAULT
, bloc
);
7325 ref
= Expression::make_temporary_reference(index
, bloc
);
7326 e2
= Expression::make_array_index(e2
, ref
, NULL
, NULL
, bloc
);
7328 Expression
* cond
= Expression::make_binary(OPERATOR_NOTEQ
, e1
, e2
, bloc
);
7330 // If the elements are not equal, return false.
7331 gogo
->start_block(bloc
);
7332 Expression_list
* vals
= new Expression_list();
7333 vals
->push_back(Expression::make_boolean(false, bloc
));
7334 Statement
* s
= Statement::make_return_statement(vals
, bloc
);
7335 gogo
->add_statement(s
);
7336 Block
* then_block
= gogo
->finish_block(bloc
);
7338 s
= Statement::make_if_statement(cond
, then_block
, NULL
, bloc
);
7339 gogo
->add_statement(s
);
7341 Block
* statements
= gogo
->finish_block(bloc
);
7343 for_range
->add_statements(statements
);
7344 gogo
->add_statement(for_range
);
7346 // All the elements are equal, so return true.
7347 vals
= new Expression_list();
7348 vals
->push_back(Expression::make_boolean(true, bloc
));
7349 s
= Statement::make_return_statement(vals
, bloc
);
7350 gogo
->add_statement(s
);
7353 // Get the backend representation of the fields of a slice. This is
7354 // not declared in types.h so that types.h doesn't have to #include
7357 // We use int for the count and capacity fields. This matches 6g.
7358 // The language more or less assumes that we can't allocate space of a
7359 // size which does not fit in int.
7362 get_backend_slice_fields(Gogo
* gogo
, Array_type
* type
, bool use_placeholder
,
7363 std::vector
<Backend::Btyped_identifier
>* bfields
)
7367 Type
* pet
= Type::make_pointer_type(type
->element_type());
7368 Btype
* pbet
= (use_placeholder
7369 ? pet
->get_backend_placeholder(gogo
)
7370 : pet
->get_backend(gogo
));
7371 Location ploc
= Linemap::predeclared_location();
7373 Backend::Btyped_identifier
* p
= &(*bfields
)[0];
7374 p
->name
= "__values";
7378 Type
* int_type
= Type::lookup_integer_type("int");
7381 p
->name
= "__count";
7382 p
->btype
= int_type
->get_backend(gogo
);
7386 p
->name
= "__capacity";
7387 p
->btype
= int_type
->get_backend(gogo
);
7391 // Get the backend representation for the type of this array. A fixed array is
7392 // simply represented as ARRAY_TYPE with the appropriate index--i.e., it is
7393 // just like an array in C. An open array is a struct with three
7394 // fields: a data pointer, the length, and the capacity.
7397 Array_type::do_get_backend(Gogo
* gogo
)
7399 if (this->length_
== NULL
)
7401 std::vector
<Backend::Btyped_identifier
> bfields
;
7402 get_backend_slice_fields(gogo
, this, false, &bfields
);
7403 return gogo
->backend()->struct_type(bfields
);
7407 Btype
* element
= this->get_backend_element(gogo
, false);
7408 Bexpression
* len
= this->get_backend_length(gogo
);
7409 return gogo
->backend()->array_type(element
, len
);
7413 // Return the backend representation of the element type.
7416 Array_type::get_backend_element(Gogo
* gogo
, bool use_placeholder
)
7418 if (use_placeholder
)
7419 return this->element_type_
->get_backend_placeholder(gogo
);
7421 return this->element_type_
->get_backend(gogo
);
7424 // Return the backend representation of the length. The length may be
7425 // computed using a function call, so we must only evaluate it once.
7428 Array_type::get_backend_length(Gogo
* gogo
)
7430 go_assert(this->length_
!= NULL
);
7431 if (this->blength_
== NULL
)
7433 if (this->length_
->is_error_expression())
7435 this->blength_
= gogo
->backend()->error_expression();
7436 return this->blength_
;
7438 Numeric_constant nc
;
7440 if (this->length_
->numeric_constant_value(&nc
) && nc
.to_int(&val
))
7442 if (mpz_sgn(val
) < 0)
7444 this->blength_
= gogo
->backend()->error_expression();
7445 return this->blength_
;
7447 Type
* t
= nc
.type();
7449 t
= Type::lookup_integer_type("int");
7450 else if (t
->is_abstract())
7451 t
= t
->make_non_abstract_type();
7452 Btype
* btype
= t
->get_backend(gogo
);
7454 gogo
->backend()->integer_constant_expression(btype
, val
);
7459 // Make up a translation context for the array length
7460 // expression. FIXME: This won't work in general.
7461 Translate_context
context(gogo
, NULL
, NULL
, NULL
);
7462 this->blength_
= this->length_
->get_backend(&context
);
7464 Btype
* ibtype
= Type::lookup_integer_type("int")->get_backend(gogo
);
7466 gogo
->backend()->convert_expression(ibtype
, this->blength_
,
7467 this->length_
->location());
7470 return this->blength_
;
7473 // Finish backend representation of the array.
7476 Array_type::finish_backend_element(Gogo
* gogo
)
7478 Type
* et
= this->array_type()->element_type();
7479 et
->get_backend(gogo
);
7480 if (this->is_slice_type())
7482 // This relies on the fact that we always use the same
7483 // structure for a pointer to any given type.
7484 Type
* pet
= Type::make_pointer_type(et
);
7485 pet
->get_backend(gogo
);
7489 // Return an expression for a pointer to the values in ARRAY.
7492 Array_type::get_value_pointer(Gogo
*, Expression
* array
, bool is_lvalue
) const
7494 if (this->length() != NULL
)
7497 go_assert(array
->type()->array_type() != NULL
);
7498 Type
* etype
= array
->type()->array_type()->element_type();
7499 array
= Expression::make_unary(OPERATOR_AND
, array
, array
->location());
7500 return Expression::make_cast(Type::make_pointer_type(etype
), array
,
7508 Temporary_reference_expression
* tref
=
7509 array
->temporary_reference_expression();
7510 Var_expression
* ve
= array
->var_expression();
7513 tref
= tref
->copy()->temporary_reference_expression();
7514 tref
->set_is_lvalue();
7517 else if (ve
!= NULL
)
7519 ve
= new Var_expression(ve
->named_object(), ve
->location());
7524 return Expression::make_slice_info(array
,
7525 Expression::SLICE_INFO_VALUE_POINTER
,
7529 // Return an expression for the length of the array ARRAY which has this
7533 Array_type::get_length(Gogo
*, Expression
* array
) const
7535 if (this->length_
!= NULL
)
7536 return this->length_
;
7538 // This is a slice. We need to read the length field.
7539 return Expression::make_slice_info(array
, Expression::SLICE_INFO_LENGTH
,
7543 // Return an expression for the capacity of the array ARRAY which has this
7547 Array_type::get_capacity(Gogo
*, Expression
* array
) const
7549 if (this->length_
!= NULL
)
7550 return this->length_
;
7552 // This is a slice. We need to read the capacity field.
7553 return Expression::make_slice_info(array
, Expression::SLICE_INFO_CAPACITY
,
7560 Array_type::do_export(Export
* exp
) const
7562 exp
->write_c_string("[");
7563 if (this->length_
!= NULL
)
7564 this->length_
->export_expression(exp
);
7565 exp
->write_c_string("] ");
7566 exp
->write_type(this->element_type_
);
7572 Array_type::do_import(Import
* imp
)
7574 imp
->require_c_string("[");
7576 if (imp
->peek_char() == ']')
7579 length
= Expression::import_expression(imp
);
7580 imp
->require_c_string("] ");
7581 Type
* element_type
= imp
->read_type();
7582 return Type::make_array_type(element_type
, length
);
7585 // The type of an array type descriptor.
7588 Array_type::make_array_type_descriptor_type()
7593 Type
* tdt
= Type::make_type_descriptor_type();
7594 Type
* ptdt
= Type::make_type_descriptor_ptr_type();
7596 Type
* uintptr_type
= Type::lookup_integer_type("uintptr");
7599 Type::make_builtin_struct_type(4,
7603 "len", uintptr_type
);
7605 ret
= Type::make_builtin_named_type("ArrayType", sf
);
7611 // The type of an slice type descriptor.
7614 Array_type::make_slice_type_descriptor_type()
7619 Type
* tdt
= Type::make_type_descriptor_type();
7620 Type
* ptdt
= Type::make_type_descriptor_ptr_type();
7623 Type::make_builtin_struct_type(2,
7627 ret
= Type::make_builtin_named_type("SliceType", sf
);
7633 // Build a type descriptor for an array/slice type.
7636 Array_type::do_type_descriptor(Gogo
* gogo
, Named_type
* name
)
7638 if (this->length_
!= NULL
)
7639 return this->array_type_descriptor(gogo
, name
);
7641 return this->slice_type_descriptor(gogo
, name
);
7644 // Build a type descriptor for an array type.
7647 Array_type::array_type_descriptor(Gogo
* gogo
, Named_type
* name
)
7649 Location bloc
= Linemap::predeclared_location();
7651 Type
* atdt
= Array_type::make_array_type_descriptor_type();
7653 const Struct_field_list
* fields
= atdt
->struct_type()->fields();
7655 Expression_list
* vals
= new Expression_list();
7658 Struct_field_list::const_iterator p
= fields
->begin();
7659 go_assert(p
->is_field_name("_type"));
7660 vals
->push_back(this->type_descriptor_constructor(gogo
,
7661 RUNTIME_TYPE_KIND_ARRAY
,
7665 go_assert(p
->is_field_name("elem"));
7666 vals
->push_back(Expression::make_type_descriptor(this->element_type_
, bloc
));
7669 go_assert(p
->is_field_name("slice"));
7670 Type
* slice_type
= Type::make_array_type(this->element_type_
, NULL
);
7671 vals
->push_back(Expression::make_type_descriptor(slice_type
, bloc
));
7674 go_assert(p
->is_field_name("len"));
7675 vals
->push_back(Expression::make_cast(p
->type(), this->length_
, bloc
));
7678 go_assert(p
== fields
->end());
7680 return Expression::make_struct_composite_literal(atdt
, vals
, bloc
);
7683 // Build a type descriptor for a slice type.
7686 Array_type::slice_type_descriptor(Gogo
* gogo
, Named_type
* name
)
7688 Location bloc
= Linemap::predeclared_location();
7690 Type
* stdt
= Array_type::make_slice_type_descriptor_type();
7692 const Struct_field_list
* fields
= stdt
->struct_type()->fields();
7694 Expression_list
* vals
= new Expression_list();
7697 Struct_field_list::const_iterator p
= fields
->begin();
7698 go_assert(p
->is_field_name("_type"));
7699 vals
->push_back(this->type_descriptor_constructor(gogo
,
7700 RUNTIME_TYPE_KIND_SLICE
,
7704 go_assert(p
->is_field_name("elem"));
7705 vals
->push_back(Expression::make_type_descriptor(this->element_type_
, bloc
));
7708 go_assert(p
== fields
->end());
7710 return Expression::make_struct_composite_literal(stdt
, vals
, bloc
);
7713 // Reflection string.
7716 Array_type::do_reflection(Gogo
* gogo
, std::string
* ret
) const
7718 ret
->push_back('[');
7719 if (this->length_
!= NULL
)
7721 Numeric_constant nc
;
7722 if (!this->length_
->numeric_constant_value(&nc
))
7724 go_assert(saw_errors());
7728 if (!nc
.to_int(&val
))
7730 go_assert(saw_errors());
7733 char* s
= mpz_get_str(NULL
, 10, val
);
7738 ret
->push_back(']');
7740 this->append_reflection(this->element_type_
, gogo
, ret
);
7743 // Make an array type.
7746 Type::make_array_type(Type
* element_type
, Expression
* length
)
7748 return new Array_type(element_type
, length
);
7753 Named_object
* Map_type::zero_value
;
7754 int64_t Map_type::zero_value_size
;
7755 int64_t Map_type::zero_value_align
;
7757 // If this map requires the "fat" functions, return the pointer to
7758 // pass as the zero value to those functions. Otherwise, in the
7759 // normal case, return NULL. The map requires the "fat" functions if
7760 // the value size is larger than max_zero_size bytes. max_zero_size
7761 // must match maxZero in libgo/go/runtime/hashmap.go.
7764 Map_type::fat_zero_value(Gogo
* gogo
)
7767 if (!this->val_type_
->backend_type_size(gogo
, &valsize
))
7769 go_assert(saw_errors());
7772 if (valsize
<= Map_type::max_zero_size
)
7775 if (Map_type::zero_value_size
< valsize
)
7776 Map_type::zero_value_size
= valsize
;
7779 if (!this->val_type_
->backend_type_align(gogo
, &valalign
))
7781 go_assert(saw_errors());
7785 if (Map_type::zero_value_align
< valalign
)
7786 Map_type::zero_value_align
= valalign
;
7788 Location bloc
= Linemap::predeclared_location();
7790 if (Map_type::zero_value
== NULL
)
7792 // The final type will be set in backend_zero_value.
7793 Type
* uint8_type
= Type::lookup_integer_type("uint8");
7794 Expression
* size
= Expression::make_integer_ul(0, NULL
, bloc
);
7795 Array_type
* array_type
= Type::make_array_type(uint8_type
, size
);
7796 array_type
->set_is_array_incomparable();
7797 Variable
* var
= new Variable(array_type
, NULL
, true, false, false, bloc
);
7798 std::string name
= gogo
->map_zero_value_name();
7799 Map_type::zero_value
= Named_object::make_variable(name
, NULL
, var
);
7802 Expression
* z
= Expression::make_var_reference(Map_type::zero_value
, bloc
);
7803 z
= Expression::make_unary(OPERATOR_AND
, z
, bloc
);
7804 Type
* unsafe_ptr_type
= Type::make_pointer_type(Type::make_void_type());
7805 z
= Expression::make_cast(unsafe_ptr_type
, z
, bloc
);
7809 // Return whether VAR is the map zero value.
7812 Map_type::is_zero_value(Variable
* var
)
7814 return (Map_type::zero_value
!= NULL
7815 && Map_type::zero_value
->var_value() == var
);
7818 // Return the backend representation for the zero value.
7821 Map_type::backend_zero_value(Gogo
* gogo
)
7823 Location bloc
= Linemap::predeclared_location();
7825 go_assert(Map_type::zero_value
!= NULL
);
7827 Type
* uint8_type
= Type::lookup_integer_type("uint8");
7828 Btype
* buint8_type
= uint8_type
->get_backend(gogo
);
7830 Type
* int_type
= Type::lookup_integer_type("int");
7832 Expression
* e
= Expression::make_integer_int64(Map_type::zero_value_size
,
7834 Translate_context
context(gogo
, NULL
, NULL
, NULL
);
7835 Bexpression
* blength
= e
->get_backend(&context
);
7837 Btype
* barray_type
= gogo
->backend()->array_type(buint8_type
, blength
);
7839 std::string zname
= Map_type::zero_value
->name();
7840 std::string
asm_name(go_selectively_encode_id(zname
));
7842 gogo
->backend()->implicit_variable(zname
, asm_name
,
7843 barray_type
, false, false, true,
7844 Map_type::zero_value_align
);
7845 gogo
->backend()->implicit_variable_set_init(zvar
, zname
, barray_type
,
7846 false, false, true, NULL
);
7853 Map_type::do_traverse(Traverse
* traverse
)
7855 if (Type::traverse(this->key_type_
, traverse
) == TRAVERSE_EXIT
7856 || Type::traverse(this->val_type_
, traverse
) == TRAVERSE_EXIT
)
7857 return TRAVERSE_EXIT
;
7858 return TRAVERSE_CONTINUE
;
7861 // Check that the map type is OK.
7864 Map_type::do_verify()
7866 // The runtime support uses "map[void]void".
7867 if (!this->key_type_
->is_comparable() && !this->key_type_
->is_void_type())
7868 go_error_at(this->location_
, "invalid map key type");
7869 if (!this->key_type_
->in_heap())
7870 go_error_at(this->location_
, "go:notinheap map key not allowed");
7871 if (!this->val_type_
->in_heap())
7872 go_error_at(this->location_
, "go:notinheap map value not allowed");
7876 // Whether two map types are identical.
7879 Map_type::is_identical(const Map_type
* t
, Cmp_tags cmp_tags
,
7880 bool errors_are_identical
) const
7882 return (Type::are_identical_cmp_tags(this->key_type(), t
->key_type(),
7883 cmp_tags
, errors_are_identical
, NULL
)
7884 && Type::are_identical_cmp_tags(this->val_type(), t
->val_type(),
7885 cmp_tags
, errors_are_identical
,
7892 Map_type::do_hash_for_method(Gogo
* gogo
) const
7894 return (this->key_type_
->hash_for_method(gogo
)
7895 + this->val_type_
->hash_for_method(gogo
)
7899 // Get the backend representation for a map type. A map type is
7900 // represented as a pointer to a struct. The struct is hmap in
7901 // runtime/hashmap.go.
7904 Map_type::do_get_backend(Gogo
* gogo
)
7906 static Btype
* backend_map_type
;
7907 if (backend_map_type
== NULL
)
7909 std::vector
<Backend::Btyped_identifier
> bfields(9);
7911 Location bloc
= Linemap::predeclared_location();
7913 Type
* int_type
= Type::lookup_integer_type("int");
7914 bfields
[0].name
= "count";
7915 bfields
[0].btype
= int_type
->get_backend(gogo
);
7916 bfields
[0].location
= bloc
;
7918 Type
* uint8_type
= Type::lookup_integer_type("uint8");
7919 bfields
[1].name
= "flags";
7920 bfields
[1].btype
= uint8_type
->get_backend(gogo
);
7921 bfields
[1].location
= bloc
;
7923 bfields
[2].name
= "B";
7924 bfields
[2].btype
= bfields
[1].btype
;
7925 bfields
[2].location
= bloc
;
7927 Type
* uint16_type
= Type::lookup_integer_type("uint16");
7928 bfields
[3].name
= "noverflow";
7929 bfields
[3].btype
= uint16_type
->get_backend(gogo
);
7930 bfields
[3].location
= bloc
;
7932 Type
* uint32_type
= Type::lookup_integer_type("uint32");
7933 bfields
[4].name
= "hash0";
7934 bfields
[4].btype
= uint32_type
->get_backend(gogo
);
7935 bfields
[4].location
= bloc
;
7937 Btype
* bvt
= gogo
->backend()->void_type();
7938 Btype
* bpvt
= gogo
->backend()->pointer_type(bvt
);
7939 bfields
[5].name
= "buckets";
7940 bfields
[5].btype
= bpvt
;
7941 bfields
[5].location
= bloc
;
7943 bfields
[6].name
= "oldbuckets";
7944 bfields
[6].btype
= bpvt
;
7945 bfields
[6].location
= bloc
;
7947 Type
* uintptr_type
= Type::lookup_integer_type("uintptr");
7948 bfields
[7].name
= "nevacuate";
7949 bfields
[7].btype
= uintptr_type
->get_backend(gogo
);
7950 bfields
[7].location
= bloc
;
7952 bfields
[8].name
= "extra";
7953 bfields
[8].btype
= bpvt
;
7954 bfields
[8].location
= bloc
;
7956 Btype
*bt
= gogo
->backend()->struct_type(bfields
);
7957 bt
= gogo
->backend()->named_type("runtime.hmap", bt
, bloc
);
7958 backend_map_type
= gogo
->backend()->pointer_type(bt
);
7960 return backend_map_type
;
7963 // The type of a map type descriptor.
7966 Map_type::make_map_type_descriptor_type()
7971 Type
* tdt
= Type::make_type_descriptor_type();
7972 Type
* ptdt
= Type::make_type_descriptor_ptr_type();
7973 Type
* uint8_type
= Type::lookup_integer_type("uint8");
7974 Type
* uint16_type
= Type::lookup_integer_type("uint16");
7975 Type
* bool_type
= Type::lookup_bool_type();
7978 Type::make_builtin_struct_type(11,
7983 "keysize", uint8_type
,
7984 "indirectkey", bool_type
,
7985 "valuesize", uint8_type
,
7986 "indirectvalue", bool_type
,
7987 "bucketsize", uint16_type
,
7988 "reflexivekey", bool_type
,
7989 "needkeyupdate", bool_type
);
7991 ret
= Type::make_builtin_named_type("MapType", sf
);
7997 // Build a type descriptor for a map type.
8000 Map_type::do_type_descriptor(Gogo
* gogo
, Named_type
* name
)
8002 Location bloc
= Linemap::predeclared_location();
8004 Type
* mtdt
= Map_type::make_map_type_descriptor_type();
8005 Type
* uint8_type
= Type::lookup_integer_type("uint8");
8006 Type
* uint16_type
= Type::lookup_integer_type("uint16");
8009 if (!this->key_type_
->backend_type_size(gogo
, &keysize
))
8011 go_error_at(this->location_
, "error determining map key type size");
8012 return Expression::make_error(this->location_
);
8016 if (!this->val_type_
->backend_type_size(gogo
, &valsize
))
8018 go_error_at(this->location_
, "error determining map value type size");
8019 return Expression::make_error(this->location_
);
8023 if (!Type::make_pointer_type(uint8_type
)->backend_type_size(gogo
, &ptrsize
))
8025 go_assert(saw_errors());
8026 return Expression::make_error(this->location_
);
8029 Type
* bucket_type
= this->bucket_type(gogo
, keysize
, valsize
);
8030 if (bucket_type
== NULL
)
8032 go_assert(saw_errors());
8033 return Expression::make_error(this->location_
);
8037 if (!bucket_type
->backend_type_size(gogo
, &bucketsize
))
8039 go_assert(saw_errors());
8040 return Expression::make_error(this->location_
);
8043 const Struct_field_list
* fields
= mtdt
->struct_type()->fields();
8045 Expression_list
* vals
= new Expression_list();
8048 Struct_field_list::const_iterator p
= fields
->begin();
8049 go_assert(p
->is_field_name("_type"));
8050 vals
->push_back(this->type_descriptor_constructor(gogo
,
8051 RUNTIME_TYPE_KIND_MAP
,
8055 go_assert(p
->is_field_name("key"));
8056 vals
->push_back(Expression::make_type_descriptor(this->key_type_
, bloc
));
8059 go_assert(p
->is_field_name("elem"));
8060 vals
->push_back(Expression::make_type_descriptor(this->val_type_
, bloc
));
8063 go_assert(p
->is_field_name("bucket"));
8064 vals
->push_back(Expression::make_type_descriptor(bucket_type
, bloc
));
8067 go_assert(p
->is_field_name("keysize"));
8068 if (keysize
> Map_type::max_key_size
)
8069 vals
->push_back(Expression::make_integer_int64(ptrsize
, uint8_type
, bloc
));
8071 vals
->push_back(Expression::make_integer_int64(keysize
, uint8_type
, bloc
));
8074 go_assert(p
->is_field_name("indirectkey"));
8075 vals
->push_back(Expression::make_boolean(keysize
> Map_type::max_key_size
,
8079 go_assert(p
->is_field_name("valuesize"));
8080 if (valsize
> Map_type::max_val_size
)
8081 vals
->push_back(Expression::make_integer_int64(ptrsize
, uint8_type
, bloc
));
8083 vals
->push_back(Expression::make_integer_int64(valsize
, uint8_type
, bloc
));
8086 go_assert(p
->is_field_name("indirectvalue"));
8087 vals
->push_back(Expression::make_boolean(valsize
> Map_type::max_val_size
,
8091 go_assert(p
->is_field_name("bucketsize"));
8092 vals
->push_back(Expression::make_integer_int64(bucketsize
, uint16_type
,
8096 go_assert(p
->is_field_name("reflexivekey"));
8097 vals
->push_back(Expression::make_boolean(this->key_type_
->is_reflexive(),
8101 go_assert(p
->is_field_name("needkeyupdate"));
8102 vals
->push_back(Expression::make_boolean(this->key_type_
->needs_key_update(),
8106 go_assert(p
== fields
->end());
8108 return Expression::make_struct_composite_literal(mtdt
, vals
, bloc
);
8111 // Return the bucket type to use for a map type. This must correspond
8112 // to libgo/go/runtime/hashmap.go.
8115 Map_type::bucket_type(Gogo
* gogo
, int64_t keysize
, int64_t valsize
)
8117 if (this->bucket_type_
!= NULL
)
8118 return this->bucket_type_
;
8120 Type
* key_type
= this->key_type_
;
8121 if (keysize
> Map_type::max_key_size
)
8122 key_type
= Type::make_pointer_type(key_type
);
8124 Type
* val_type
= this->val_type_
;
8125 if (valsize
> Map_type::max_val_size
)
8126 val_type
= Type::make_pointer_type(val_type
);
8128 Expression
* bucket_size
= Expression::make_integer_ul(Map_type::bucket_size
,
8129 NULL
, this->location_
);
8131 Type
* uint8_type
= Type::lookup_integer_type("uint8");
8132 Array_type
* topbits_type
= Type::make_array_type(uint8_type
, bucket_size
);
8133 topbits_type
->set_is_array_incomparable();
8134 Array_type
* keys_type
= Type::make_array_type(key_type
, bucket_size
);
8135 keys_type
->set_is_array_incomparable();
8136 Array_type
* values_type
= Type::make_array_type(val_type
, bucket_size
);
8137 values_type
->set_is_array_incomparable();
8139 // If keys and values have no pointers, the map implementation can
8140 // keep a list of overflow pointers on the side so that buckets can
8141 // be marked as having no pointers. Arrange for the bucket to have
8142 // no pointers by changing the type of the overflow field to uintptr
8143 // in this case. See comment on the hmap.overflow field in
8144 // libgo/go/runtime/hashmap.go.
8145 Type
* overflow_type
;
8146 if (!key_type
->has_pointer() && !val_type
->has_pointer())
8147 overflow_type
= Type::lookup_integer_type("uintptr");
8150 // This should really be a pointer to the bucket type itself,
8151 // but that would require us to construct a Named_type for it to
8152 // give it a way to refer to itself. Since nothing really cares
8153 // (except perhaps for someone using a debugger) just use an
8155 overflow_type
= Type::make_pointer_type(Type::make_void_type());
8158 // Make sure the overflow pointer is the last memory in the struct,
8159 // because the runtime assumes it can use size-ptrSize as the offset
8160 // of the overflow pointer. We double-check that property below
8161 // once the offsets and size are computed.
8163 int64_t topbits_field_size
, topbits_field_align
;
8164 int64_t keys_field_size
, keys_field_align
;
8165 int64_t values_field_size
, values_field_align
;
8166 int64_t overflow_field_size
, overflow_field_align
;
8167 if (!topbits_type
->backend_type_size(gogo
, &topbits_field_size
)
8168 || !topbits_type
->backend_type_field_align(gogo
, &topbits_field_align
)
8169 || !keys_type
->backend_type_size(gogo
, &keys_field_size
)
8170 || !keys_type
->backend_type_field_align(gogo
, &keys_field_align
)
8171 || !values_type
->backend_type_size(gogo
, &values_field_size
)
8172 || !values_type
->backend_type_field_align(gogo
, &values_field_align
)
8173 || !overflow_type
->backend_type_size(gogo
, &overflow_field_size
)
8174 || !overflow_type
->backend_type_field_align(gogo
, &overflow_field_align
))
8176 go_assert(saw_errors());
8181 int64_t max_align
= std::max(std::max(topbits_field_align
, keys_field_align
),
8182 values_field_align
);
8183 if (max_align
<= overflow_field_align
)
8184 ret
= make_builtin_struct_type(4,
8185 "topbits", topbits_type
,
8187 "values", values_type
,
8188 "overflow", overflow_type
);
8191 size_t off
= topbits_field_size
;
8192 off
= ((off
+ keys_field_align
- 1)
8193 &~ static_cast<size_t>(keys_field_align
- 1));
8194 off
+= keys_field_size
;
8195 off
= ((off
+ values_field_align
- 1)
8196 &~ static_cast<size_t>(values_field_align
- 1));
8197 off
+= values_field_size
;
8199 int64_t padded_overflow_field_size
=
8200 ((overflow_field_size
+ max_align
- 1)
8201 &~ static_cast<size_t>(max_align
- 1));
8204 ovoff
= ((ovoff
+ max_align
- 1)
8205 &~ static_cast<size_t>(max_align
- 1));
8206 size_t pad
= (ovoff
- off
8207 + padded_overflow_field_size
- overflow_field_size
);
8209 Expression
* pad_expr
= Expression::make_integer_ul(pad
, NULL
,
8211 Array_type
* pad_type
= Type::make_array_type(uint8_type
, pad_expr
);
8212 pad_type
->set_is_array_incomparable();
8214 ret
= make_builtin_struct_type(5,
8215 "topbits", topbits_type
,
8217 "values", values_type
,
8219 "overflow", overflow_type
);
8222 // Verify that the overflow field is just before the end of the
8225 Btype
* btype
= ret
->get_backend(gogo
);
8226 int64_t offset
= gogo
->backend()->type_field_offset(btype
,
8227 ret
->field_count() - 1);
8229 if (!ret
->backend_type_size(gogo
, &size
))
8231 go_assert(saw_errors());
8236 if (!Type::make_pointer_type(uint8_type
)->backend_type_size(gogo
, &ptr_size
))
8238 go_assert(saw_errors());
8242 go_assert(offset
+ ptr_size
== size
);
8244 ret
->set_is_struct_incomparable();
8246 this->bucket_type_
= ret
;
8250 // Return the hashmap type for a map type.
8253 Map_type::hmap_type(Type
* bucket_type
)
8255 if (this->hmap_type_
!= NULL
)
8256 return this->hmap_type_
;
8258 Type
* int_type
= Type::lookup_integer_type("int");
8259 Type
* uint8_type
= Type::lookup_integer_type("uint8");
8260 Type
* uint16_type
= Type::lookup_integer_type("uint16");
8261 Type
* uint32_type
= Type::lookup_integer_type("uint32");
8262 Type
* uintptr_type
= Type::lookup_integer_type("uintptr");
8263 Type
* void_ptr_type
= Type::make_pointer_type(Type::make_void_type());
8265 Type
* ptr_bucket_type
= Type::make_pointer_type(bucket_type
);
8267 Struct_type
* ret
= make_builtin_struct_type(9,
8269 "flags", uint8_type
,
8271 "noverflow", uint16_type
,
8272 "hash0", uint32_type
,
8273 "buckets", ptr_bucket_type
,
8274 "oldbuckets", ptr_bucket_type
,
8275 "nevacuate", uintptr_type
,
8276 "extra", void_ptr_type
);
8277 ret
->set_is_struct_incomparable();
8278 this->hmap_type_
= ret
;
8282 // Return the iterator type for a map type. This is the type of the
8283 // value used when doing a range over a map.
8286 Map_type::hiter_type(Gogo
* gogo
)
8288 if (this->hiter_type_
!= NULL
)
8289 return this->hiter_type_
;
8291 int64_t keysize
, valsize
;
8292 if (!this->key_type_
->backend_type_size(gogo
, &keysize
)
8293 || !this->val_type_
->backend_type_size(gogo
, &valsize
))
8295 go_assert(saw_errors());
8299 Type
* key_ptr_type
= Type::make_pointer_type(this->key_type_
);
8300 Type
* val_ptr_type
= Type::make_pointer_type(this->val_type_
);
8301 Type
* uint8_type
= Type::lookup_integer_type("uint8");
8302 Type
* uint8_ptr_type
= Type::make_pointer_type(uint8_type
);
8303 Type
* uintptr_type
= Type::lookup_integer_type("uintptr");
8304 Type
* bucket_type
= this->bucket_type(gogo
, keysize
, valsize
);
8305 Type
* bucket_ptr_type
= Type::make_pointer_type(bucket_type
);
8306 Type
* hmap_type
= this->hmap_type(bucket_type
);
8307 Type
* hmap_ptr_type
= Type::make_pointer_type(hmap_type
);
8308 Type
* void_ptr_type
= Type::make_pointer_type(Type::make_void_type());
8309 Type
* bool_type
= Type::lookup_bool_type();
8311 Struct_type
* ret
= make_builtin_struct_type(15,
8312 "key", key_ptr_type
,
8313 "val", val_ptr_type
,
8314 "t", uint8_ptr_type
,
8316 "buckets", bucket_ptr_type
,
8317 "bptr", bucket_ptr_type
,
8318 "overflow", void_ptr_type
,
8319 "oldoverflow", void_ptr_type
,
8320 "startBucket", uintptr_type
,
8321 "offset", uint8_type
,
8322 "wrapped", bool_type
,
8325 "bucket", uintptr_type
,
8326 "checkBucket", uintptr_type
);
8327 ret
->set_is_struct_incomparable();
8328 this->hiter_type_
= ret
;
8332 // Reflection string for a map.
8335 Map_type::do_reflection(Gogo
* gogo
, std::string
* ret
) const
8337 ret
->append("map[");
8338 this->append_reflection(this->key_type_
, gogo
, ret
);
8340 this->append_reflection(this->val_type_
, gogo
, ret
);
8343 // Export a map type.
8346 Map_type::do_export(Export
* exp
) const
8348 exp
->write_c_string("map [");
8349 exp
->write_type(this->key_type_
);
8350 exp
->write_c_string("] ");
8351 exp
->write_type(this->val_type_
);
8354 // Import a map type.
8357 Map_type::do_import(Import
* imp
)
8359 imp
->require_c_string("map [");
8360 Type
* key_type
= imp
->read_type();
8361 imp
->require_c_string("] ");
8362 Type
* val_type
= imp
->read_type();
8363 return Type::make_map_type(key_type
, val_type
, imp
->location());
8369 Type::make_map_type(Type
* key_type
, Type
* val_type
, Location location
)
8371 return new Map_type(key_type
, val_type
, location
);
8374 // Class Channel_type.
8379 Channel_type::do_verify()
8381 // We have no location for this error, but this is not something the
8382 // ordinary user will see.
8383 if (!this->element_type_
->in_heap())
8384 go_error_at(Linemap::unknown_location(),
8385 "chan of go:notinheap type not allowed");
8392 Channel_type::do_hash_for_method(Gogo
* gogo
) const
8394 unsigned int ret
= 0;
8395 if (this->may_send_
)
8397 if (this->may_receive_
)
8399 if (this->element_type_
!= NULL
)
8400 ret
+= this->element_type_
->hash_for_method(gogo
) << 2;
8404 // Whether this type is the same as T.
8407 Channel_type::is_identical(const Channel_type
* t
, Cmp_tags cmp_tags
,
8408 bool errors_are_identical
) const
8410 if (!Type::are_identical_cmp_tags(this->element_type(), t
->element_type(),
8411 cmp_tags
, errors_are_identical
, NULL
))
8413 return (this->may_send_
== t
->may_send_
8414 && this->may_receive_
== t
->may_receive_
);
8417 // Return the backend representation for a channel type. A channel is a pointer
8418 // to a __go_channel struct. The __go_channel struct is defined in
8419 // libgo/runtime/channel.h.
8422 Channel_type::do_get_backend(Gogo
* gogo
)
8424 static Btype
* backend_channel_type
;
8425 if (backend_channel_type
== NULL
)
8427 std::vector
<Backend::Btyped_identifier
> bfields
;
8428 Btype
* bt
= gogo
->backend()->struct_type(bfields
);
8429 bt
= gogo
->backend()->named_type("__go_channel", bt
,
8430 Linemap::predeclared_location());
8431 backend_channel_type
= gogo
->backend()->pointer_type(bt
);
8433 return backend_channel_type
;
8436 // Build a type descriptor for a channel type.
8439 Channel_type::make_chan_type_descriptor_type()
8444 Type
* tdt
= Type::make_type_descriptor_type();
8445 Type
* ptdt
= Type::make_type_descriptor_ptr_type();
8447 Type
* uintptr_type
= Type::lookup_integer_type("uintptr");
8450 Type::make_builtin_struct_type(3,
8453 "dir", uintptr_type
);
8455 ret
= Type::make_builtin_named_type("ChanType", sf
);
8461 // Build a type descriptor for a map type.
8464 Channel_type::do_type_descriptor(Gogo
* gogo
, Named_type
* name
)
8466 Location bloc
= Linemap::predeclared_location();
8468 Type
* ctdt
= Channel_type::make_chan_type_descriptor_type();
8470 const Struct_field_list
* fields
= ctdt
->struct_type()->fields();
8472 Expression_list
* vals
= new Expression_list();
8475 Struct_field_list::const_iterator p
= fields
->begin();
8476 go_assert(p
->is_field_name("_type"));
8477 vals
->push_back(this->type_descriptor_constructor(gogo
,
8478 RUNTIME_TYPE_KIND_CHAN
,
8482 go_assert(p
->is_field_name("elem"));
8483 vals
->push_back(Expression::make_type_descriptor(this->element_type_
, bloc
));
8486 go_assert(p
->is_field_name("dir"));
8487 // These bits must match the ones in libgo/runtime/go-type.h.
8489 if (this->may_receive_
)
8491 if (this->may_send_
)
8493 vals
->push_back(Expression::make_integer_ul(val
, p
->type(), bloc
));
8496 go_assert(p
== fields
->end());
8498 return Expression::make_struct_composite_literal(ctdt
, vals
, bloc
);
8501 // Reflection string.
8504 Channel_type::do_reflection(Gogo
* gogo
, std::string
* ret
) const
8506 if (!this->may_send_
)
8508 ret
->append("chan");
8509 if (!this->may_receive_
)
8511 ret
->push_back(' ');
8512 this->append_reflection(this->element_type_
, gogo
, ret
);
8518 Channel_type::do_export(Export
* exp
) const
8520 exp
->write_c_string("chan ");
8521 if (this->may_send_
&& !this->may_receive_
)
8522 exp
->write_c_string("-< ");
8523 else if (this->may_receive_
&& !this->may_send_
)
8524 exp
->write_c_string("<- ");
8525 exp
->write_type(this->element_type_
);
8531 Channel_type::do_import(Import
* imp
)
8533 imp
->require_c_string("chan ");
8537 if (imp
->match_c_string("-< "))
8541 may_receive
= false;
8543 else if (imp
->match_c_string("<- "))
8555 Type
* element_type
= imp
->read_type();
8557 return Type::make_channel_type(may_send
, may_receive
, element_type
);
8560 // Return the type that the runtime package uses for one case of a
8561 // select statement. An array of values of this type is allocated on
8562 // the stack. This must match scase in libgo/go/runtime/select.go.
8565 Channel_type::select_case_type()
8567 static Struct_type
* scase_type
;
8568 if (scase_type
== NULL
)
8570 Type
* unsafe_pointer_type
=
8571 Type::make_pointer_type(Type::make_void_type());
8572 Type
* uint16_type
= Type::lookup_integer_type("uint16");
8573 Type
* int64_type
= Type::lookup_integer_type("int64");
8575 Type::make_builtin_struct_type(4,
8576 "c", unsafe_pointer_type
,
8577 "elem", unsafe_pointer_type
,
8578 "kind", uint16_type
,
8579 "releasetime", int64_type
);
8580 scase_type
->set_is_struct_incomparable();
8585 // Make a new channel type.
8588 Type::make_channel_type(bool send
, bool receive
, Type
* element_type
)
8590 return new Channel_type(send
, receive
, element_type
);
8593 // Class Interface_type.
8595 // Return the list of methods.
8597 const Typed_identifier_list
*
8598 Interface_type::methods() const
8600 go_assert(this->methods_are_finalized_
|| saw_errors());
8601 return this->all_methods_
;
8604 // Return the number of methods.
8607 Interface_type::method_count() const
8609 go_assert(this->methods_are_finalized_
|| saw_errors());
8610 return this->all_methods_
== NULL
? 0 : this->all_methods_
->size();
8616 Interface_type::do_traverse(Traverse
* traverse
)
8618 Typed_identifier_list
* methods
= (this->methods_are_finalized_
8619 ? this->all_methods_
8620 : this->parse_methods_
);
8621 if (methods
== NULL
)
8622 return TRAVERSE_CONTINUE
;
8623 return methods
->traverse(traverse
);
8626 // Finalize the methods. This handles interface inheritance.
8629 Interface_type::finalize_methods()
8631 if (this->methods_are_finalized_
)
8633 this->methods_are_finalized_
= true;
8634 if (this->parse_methods_
== NULL
)
8637 this->all_methods_
= new Typed_identifier_list();
8638 this->all_methods_
->reserve(this->parse_methods_
->size());
8639 Typed_identifier_list inherit
;
8640 for (Typed_identifier_list::const_iterator pm
=
8641 this->parse_methods_
->begin();
8642 pm
!= this->parse_methods_
->end();
8645 const Typed_identifier
* p
= &*pm
;
8646 if (p
->name().empty())
8647 inherit
.push_back(*p
);
8648 else if (this->find_method(p
->name()) == NULL
)
8649 this->all_methods_
->push_back(*p
);
8651 go_error_at(p
->location(), "duplicate method %qs",
8652 Gogo::message_name(p
->name()).c_str());
8655 std::vector
<Named_type
*> seen
;
8656 seen
.reserve(inherit
.size());
8657 bool issued_recursive_error
= false;
8658 while (!inherit
.empty())
8660 Type
* t
= inherit
.back().type();
8661 Location tl
= inherit
.back().location();
8664 Interface_type
* it
= t
->interface_type();
8668 go_error_at(tl
, "interface contains embedded non-interface");
8673 if (!issued_recursive_error
)
8675 go_error_at(tl
, "invalid recursive interface");
8676 issued_recursive_error
= true;
8681 Named_type
* nt
= t
->named_type();
8682 if (nt
!= NULL
&& it
->parse_methods_
!= NULL
)
8684 std::vector
<Named_type
*>::const_iterator q
;
8685 for (q
= seen
.begin(); q
!= seen
.end(); ++q
)
8689 go_error_at(tl
, "inherited interface loop");
8693 if (q
!= seen
.end())
8698 const Typed_identifier_list
* imethods
= it
->parse_methods_
;
8699 if (imethods
== NULL
)
8701 for (Typed_identifier_list::const_iterator q
= imethods
->begin();
8702 q
!= imethods
->end();
8705 if (q
->name().empty())
8706 inherit
.push_back(*q
);
8707 else if (this->find_method(q
->name()) == NULL
)
8708 this->all_methods_
->push_back(Typed_identifier(q
->name(),
8711 go_error_at(tl
, "inherited method %qs is ambiguous",
8712 Gogo::message_name(q
->name()).c_str());
8716 if (!this->all_methods_
->empty())
8717 this->all_methods_
->sort_by_name();
8720 delete this->all_methods_
;
8721 this->all_methods_
= NULL
;
8725 // Return the method NAME, or NULL.
8727 const Typed_identifier
*
8728 Interface_type::find_method(const std::string
& name
) const
8730 go_assert(this->methods_are_finalized_
);
8731 if (this->all_methods_
== NULL
)
8733 for (Typed_identifier_list::const_iterator p
= this->all_methods_
->begin();
8734 p
!= this->all_methods_
->end();
8736 if (p
->name() == name
)
8741 // Return the method index.
8744 Interface_type::method_index(const std::string
& name
) const
8746 go_assert(this->methods_are_finalized_
&& this->all_methods_
!= NULL
);
8748 for (Typed_identifier_list::const_iterator p
= this->all_methods_
->begin();
8749 p
!= this->all_methods_
->end();
8751 if (p
->name() == name
)
8756 // Return whether NAME is an unexported method, for better error
8760 Interface_type::is_unexported_method(Gogo
* gogo
, const std::string
& name
) const
8762 go_assert(this->methods_are_finalized_
);
8763 if (this->all_methods_
== NULL
)
8765 for (Typed_identifier_list::const_iterator p
= this->all_methods_
->begin();
8766 p
!= this->all_methods_
->end();
8769 const std::string
& method_name(p
->name());
8770 if (Gogo::is_hidden_name(method_name
)
8771 && name
== Gogo::unpack_hidden_name(method_name
)
8772 && gogo
->pack_hidden_name(name
, false) != method_name
)
8778 // Whether this type is identical with T.
8781 Interface_type::is_identical(const Interface_type
* t
, Cmp_tags cmp_tags
,
8782 bool errors_are_identical
) const
8784 // If methods have not been finalized, then we are asking whether
8785 // func redeclarations are the same. This is an error, so for
8786 // simplicity we say they are never the same.
8787 if (!this->methods_are_finalized_
|| !t
->methods_are_finalized_
)
8790 // We require the same methods with the same types. The methods
8791 // have already been sorted.
8792 if (this->all_methods_
== NULL
|| t
->all_methods_
== NULL
)
8793 return this->all_methods_
== t
->all_methods_
;
8795 if (this->assume_identical(this, t
) || t
->assume_identical(t
, this))
8798 Assume_identical
* hold_ai
= this->assume_identical_
;
8799 Assume_identical ai
;
8803 this->assume_identical_
= &ai
;
8805 Typed_identifier_list::const_iterator p1
= this->all_methods_
->begin();
8806 Typed_identifier_list::const_iterator p2
;
8807 for (p2
= t
->all_methods_
->begin(); p2
!= t
->all_methods_
->end(); ++p1
, ++p2
)
8809 if (p1
== this->all_methods_
->end())
8811 if (p1
->name() != p2
->name()
8812 || !Type::are_identical_cmp_tags(p1
->type(), p2
->type(), cmp_tags
,
8813 errors_are_identical
, NULL
))
8817 this->assume_identical_
= hold_ai
;
8819 return p1
== this->all_methods_
->end() && p2
== t
->all_methods_
->end();
8822 // Return true if T1 and T2 are assumed to be identical during a type
8826 Interface_type::assume_identical(const Interface_type
* t1
,
8827 const Interface_type
* t2
) const
8829 for (Assume_identical
* p
= this->assume_identical_
;
8832 if ((p
->t1
== t1
&& p
->t2
== t2
) || (p
->t1
== t2
&& p
->t2
== t1
))
8837 // Whether we can assign the interface type T to this type. The types
8838 // are known to not be identical. An interface assignment is only
8839 // permitted if T is known to implement all methods in THIS.
8840 // Otherwise a type guard is required.
8843 Interface_type::is_compatible_for_assign(const Interface_type
* t
,
8844 std::string
* reason
) const
8846 go_assert(this->methods_are_finalized_
&& t
->methods_are_finalized_
);
8847 if (this->all_methods_
== NULL
)
8849 for (Typed_identifier_list::const_iterator p
= this->all_methods_
->begin();
8850 p
!= this->all_methods_
->end();
8853 const Typed_identifier
* m
= t
->find_method(p
->name());
8859 snprintf(buf
, sizeof buf
,
8860 _("need explicit conversion; missing method %s%s%s"),
8861 go_open_quote(), Gogo::message_name(p
->name()).c_str(),
8863 reason
->assign(buf
);
8868 std::string subreason
;
8869 if (!Type::are_identical(p
->type(), m
->type(), true, &subreason
))
8873 std::string n
= Gogo::message_name(p
->name());
8874 size_t len
= 100 + n
.length() + subreason
.length();
8875 char* buf
= new char[len
];
8876 if (subreason
.empty())
8877 snprintf(buf
, len
, _("incompatible type for method %s%s%s"),
8878 go_open_quote(), n
.c_str(), go_close_quote());
8881 _("incompatible type for method %s%s%s (%s)"),
8882 go_open_quote(), n
.c_str(), go_close_quote(),
8884 reason
->assign(buf
);
8897 Interface_type::do_hash_for_method(Gogo
*) const
8899 go_assert(this->methods_are_finalized_
);
8900 unsigned int ret
= 0;
8901 if (this->all_methods_
!= NULL
)
8903 for (Typed_identifier_list::const_iterator p
=
8904 this->all_methods_
->begin();
8905 p
!= this->all_methods_
->end();
8908 ret
= Type::hash_string(p
->name(), ret
);
8909 // We don't use the method type in the hash, to avoid
8910 // infinite recursion if an interface method uses a type
8911 // which is an interface which inherits from the interface
8913 // type T interface { F() interface {T}}
8920 // Return true if T implements the interface. If it does not, and
8921 // REASON is not NULL, set *REASON to a useful error message.
8924 Interface_type::implements_interface(const Type
* t
, std::string
* reason
) const
8926 go_assert(this->methods_are_finalized_
);
8927 if (this->all_methods_
== NULL
)
8930 bool is_pointer
= false;
8931 const Named_type
* nt
= t
->named_type();
8932 const Struct_type
* st
= t
->struct_type();
8933 // If we start with a named type, we don't dereference it to find
8937 const Type
* pt
= t
->points_to();
8940 // If T is a pointer to a named type, then we need to look at
8941 // the type to which it points.
8943 nt
= pt
->named_type();
8944 st
= pt
->struct_type();
8948 // If we have a named type, get the methods from it rather than from
8953 // Only named and struct types have methods.
8954 if (nt
== NULL
&& st
== NULL
)
8958 if (t
->points_to() != NULL
8959 && t
->points_to()->interface_type() != NULL
)
8960 reason
->assign(_("pointer to interface type has no methods"));
8962 reason
->assign(_("type has no methods"));
8967 if (nt
!= NULL
? !nt
->has_any_methods() : !st
->has_any_methods())
8971 if (t
->points_to() != NULL
8972 && t
->points_to()->interface_type() != NULL
)
8973 reason
->assign(_("pointer to interface type has no methods"));
8975 reason
->assign(_("type has no methods"));
8980 for (Typed_identifier_list::const_iterator p
= this->all_methods_
->begin();
8981 p
!= this->all_methods_
->end();
8984 bool is_ambiguous
= false;
8985 Method
* m
= (nt
!= NULL
8986 ? nt
->method_function(p
->name(), &is_ambiguous
)
8987 : st
->method_function(p
->name(), &is_ambiguous
));
8992 std::string n
= Gogo::message_name(p
->name());
8993 size_t len
= n
.length() + 100;
8994 char* buf
= new char[len
];
8996 snprintf(buf
, len
, _("ambiguous method %s%s%s"),
8997 go_open_quote(), n
.c_str(), go_close_quote());
8999 snprintf(buf
, len
, _("missing method %s%s%s"),
9000 go_open_quote(), n
.c_str(), go_close_quote());
9001 reason
->assign(buf
);
9007 Function_type
*p_fn_type
= p
->type()->function_type();
9008 Function_type
* m_fn_type
= m
->type()->function_type();
9009 go_assert(p_fn_type
!= NULL
&& m_fn_type
!= NULL
);
9010 std::string subreason
;
9011 if (!p_fn_type
->is_identical(m_fn_type
, true, COMPARE_TAGS
, true,
9016 std::string n
= Gogo::message_name(p
->name());
9017 size_t len
= 100 + n
.length() + subreason
.length();
9018 char* buf
= new char[len
];
9019 if (subreason
.empty())
9020 snprintf(buf
, len
, _("incompatible type for method %s%s%s"),
9021 go_open_quote(), n
.c_str(), go_close_quote());
9024 _("incompatible type for method %s%s%s (%s)"),
9025 go_open_quote(), n
.c_str(), go_close_quote(),
9027 reason
->assign(buf
);
9033 if (!is_pointer
&& !m
->is_value_method())
9037 std::string n
= Gogo::message_name(p
->name());
9038 size_t len
= 100 + n
.length();
9039 char* buf
= new char[len
];
9041 _("method %s%s%s requires a pointer receiver"),
9042 go_open_quote(), n
.c_str(), go_close_quote());
9043 reason
->assign(buf
);
9049 // If the magic //go:nointerface comment was used, the method
9050 // may not be used to implement interfaces.
9051 if (m
->nointerface())
9055 std::string n
= Gogo::message_name(p
->name());
9056 size_t len
= 100 + n
.length();
9057 char* buf
= new char[len
];
9059 _("method %s%s%s is marked go:nointerface"),
9060 go_open_quote(), n
.c_str(), go_close_quote());
9061 reason
->assign(buf
);
9071 // Return the backend representation of the empty interface type. We
9072 // use the same struct for all empty interfaces.
9075 Interface_type::get_backend_empty_interface_type(Gogo
* gogo
)
9077 static Btype
* empty_interface_type
;
9078 if (empty_interface_type
== NULL
)
9080 std::vector
<Backend::Btyped_identifier
> bfields(2);
9082 Location bloc
= Linemap::predeclared_location();
9084 Type
* pdt
= Type::make_type_descriptor_ptr_type();
9085 bfields
[0].name
= "__type_descriptor";
9086 bfields
[0].btype
= pdt
->get_backend(gogo
);
9087 bfields
[0].location
= bloc
;
9089 Type
* vt
= Type::make_pointer_type(Type::make_void_type());
9090 bfields
[1].name
= "__object";
9091 bfields
[1].btype
= vt
->get_backend(gogo
);
9092 bfields
[1].location
= bloc
;
9094 empty_interface_type
= gogo
->backend()->struct_type(bfields
);
9096 return empty_interface_type
;
9099 Interface_type::Bmethods_map
Interface_type::bmethods_map
;
9101 // Return a pointer to the backend representation of the method table.
9104 Interface_type::get_backend_methods(Gogo
* gogo
)
9106 if (this->bmethods_
!= NULL
&& !this->bmethods_is_placeholder_
)
9107 return this->bmethods_
;
9109 std::pair
<Interface_type
*, Bmethods_map_entry
> val
;
9111 val
.second
.btype
= NULL
;
9112 val
.second
.is_placeholder
= false;
9113 std::pair
<Bmethods_map::iterator
, bool> ins
=
9114 Interface_type::bmethods_map
.insert(val
);
9116 && ins
.first
->second
.btype
!= NULL
9117 && !ins
.first
->second
.is_placeholder
)
9119 this->bmethods_
= ins
.first
->second
.btype
;
9120 this->bmethods_is_placeholder_
= false;
9121 return this->bmethods_
;
9124 Location loc
= this->location();
9126 std::vector
<Backend::Btyped_identifier
>
9127 mfields(this->all_methods_
->size() + 1);
9129 Type
* pdt
= Type::make_type_descriptor_ptr_type();
9130 mfields
[0].name
= "__type_descriptor";
9131 mfields
[0].btype
= pdt
->get_backend(gogo
);
9132 mfields
[0].location
= loc
;
9134 std::string last_name
= "";
9136 for (Typed_identifier_list::const_iterator p
= this->all_methods_
->begin();
9137 p
!= this->all_methods_
->end();
9140 // The type of the method in Go only includes the parameters.
9141 // The actual method also has a receiver, which is always a
9142 // pointer. We need to add that pointer type here in order to
9143 // generate the correct type for the backend.
9144 Function_type
* ft
= p
->type()->function_type();
9145 go_assert(ft
->receiver() == NULL
);
9147 const Typed_identifier_list
* params
= ft
->parameters();
9148 Typed_identifier_list
* mparams
= new Typed_identifier_list();
9150 mparams
->reserve(params
->size() + 1);
9151 Type
* vt
= Type::make_pointer_type(Type::make_void_type());
9152 mparams
->push_back(Typed_identifier("", vt
, ft
->location()));
9155 for (Typed_identifier_list::const_iterator pp
= params
->begin();
9156 pp
!= params
->end();
9158 mparams
->push_back(*pp
);
9161 Typed_identifier_list
* mresults
= (ft
->results() == NULL
9163 : ft
->results()->copy());
9164 Function_type
* mft
= Type::make_function_type(NULL
, mparams
, mresults
,
9167 mfields
[i
].name
= Gogo::unpack_hidden_name(p
->name());
9168 mfields
[i
].btype
= mft
->get_backend_fntype(gogo
);
9169 mfields
[i
].location
= loc
;
9171 // Sanity check: the names should be sorted.
9172 go_assert(Gogo::unpack_hidden_name(p
->name())
9173 > Gogo::unpack_hidden_name(last_name
));
9174 last_name
= p
->name();
9177 Btype
* st
= gogo
->backend()->struct_type(mfields
);
9178 Btype
* ret
= gogo
->backend()->pointer_type(st
);
9180 if (ins
.first
->second
.btype
!= NULL
9181 && ins
.first
->second
.is_placeholder
)
9182 gogo
->backend()->set_placeholder_pointer_type(ins
.first
->second
.btype
,
9184 this->bmethods_
= ret
;
9185 ins
.first
->second
.btype
= ret
;
9186 this->bmethods_is_placeholder_
= false;
9187 ins
.first
->second
.is_placeholder
= false;
9191 // Return a placeholder for the pointer to the backend methods table.
9194 Interface_type::get_backend_methods_placeholder(Gogo
* gogo
)
9196 if (this->bmethods_
== NULL
)
9198 std::pair
<Interface_type
*, Bmethods_map_entry
> val
;
9200 val
.second
.btype
= NULL
;
9201 val
.second
.is_placeholder
= false;
9202 std::pair
<Bmethods_map::iterator
, bool> ins
=
9203 Interface_type::bmethods_map
.insert(val
);
9204 if (!ins
.second
&& ins
.first
->second
.btype
!= NULL
)
9206 this->bmethods_
= ins
.first
->second
.btype
;
9207 this->bmethods_is_placeholder_
= ins
.first
->second
.is_placeholder
;
9208 return this->bmethods_
;
9211 Location loc
= this->location();
9212 Btype
* bt
= gogo
->backend()->placeholder_pointer_type("", loc
, false);
9213 this->bmethods_
= bt
;
9214 ins
.first
->second
.btype
= bt
;
9215 this->bmethods_is_placeholder_
= true;
9216 ins
.first
->second
.is_placeholder
= true;
9218 return this->bmethods_
;
9221 // Return the fields of a non-empty interface type. This is not
9222 // declared in types.h so that types.h doesn't have to #include
9226 get_backend_interface_fields(Gogo
* gogo
, Interface_type
* type
,
9227 bool use_placeholder
,
9228 std::vector
<Backend::Btyped_identifier
>* bfields
)
9230 Location loc
= type
->location();
9234 (*bfields
)[0].name
= "__methods";
9235 (*bfields
)[0].btype
= (use_placeholder
9236 ? type
->get_backend_methods_placeholder(gogo
)
9237 : type
->get_backend_methods(gogo
));
9238 (*bfields
)[0].location
= loc
;
9240 Type
* vt
= Type::make_pointer_type(Type::make_void_type());
9241 (*bfields
)[1].name
= "__object";
9242 (*bfields
)[1].btype
= vt
->get_backend(gogo
);
9243 (*bfields
)[1].location
= Linemap::predeclared_location();
9246 // Return the backend representation for an interface type. An interface is a
9247 // pointer to a struct. The struct has three fields. The first field is a
9248 // pointer to the type descriptor for the dynamic type of the object.
9249 // The second field is a pointer to a table of methods for the
9250 // interface to be used with the object. The third field is the value
9251 // of the object itself.
9254 Interface_type::do_get_backend(Gogo
* gogo
)
9256 if (this->is_empty())
9257 return Interface_type::get_backend_empty_interface_type(gogo
);
9260 if (this->interface_btype_
!= NULL
)
9261 return this->interface_btype_
;
9262 this->interface_btype_
=
9263 gogo
->backend()->placeholder_struct_type("", this->location_
);
9264 std::vector
<Backend::Btyped_identifier
> bfields
;
9265 get_backend_interface_fields(gogo
, this, false, &bfields
);
9266 if (!gogo
->backend()->set_placeholder_struct_type(this->interface_btype_
,
9268 this->interface_btype_
= gogo
->backend()->error_type();
9269 return this->interface_btype_
;
9273 // Finish the backend representation of the methods.
9276 Interface_type::finish_backend_methods(Gogo
* gogo
)
9278 if (!this->is_empty())
9280 const Typed_identifier_list
* methods
= this->methods();
9281 if (methods
!= NULL
)
9283 for (Typed_identifier_list::const_iterator p
= methods
->begin();
9284 p
!= methods
->end();
9286 p
->type()->get_backend(gogo
);
9289 // Getting the backend methods now will set the placeholder
9291 this->get_backend_methods(gogo
);
9295 // The type of an interface type descriptor.
9298 Interface_type::make_interface_type_descriptor_type()
9303 Type
* tdt
= Type::make_type_descriptor_type();
9304 Type
* ptdt
= Type::make_type_descriptor_ptr_type();
9306 Type
* string_type
= Type::lookup_string_type();
9307 Type
* pointer_string_type
= Type::make_pointer_type(string_type
);
9310 Type::make_builtin_struct_type(3,
9311 "name", pointer_string_type
,
9312 "pkgPath", pointer_string_type
,
9315 Type
* nsm
= Type::make_builtin_named_type("imethod", sm
);
9317 Type
* slice_nsm
= Type::make_array_type(nsm
, NULL
);
9319 Struct_type
* s
= Type::make_builtin_struct_type(2,
9321 "methods", slice_nsm
);
9323 ret
= Type::make_builtin_named_type("InterfaceType", s
);
9329 // Build a type descriptor for an interface type.
9332 Interface_type::do_type_descriptor(Gogo
* gogo
, Named_type
* name
)
9334 Location bloc
= Linemap::predeclared_location();
9336 Type
* itdt
= Interface_type::make_interface_type_descriptor_type();
9338 const Struct_field_list
* ifields
= itdt
->struct_type()->fields();
9340 Expression_list
* ivals
= new Expression_list();
9343 Struct_field_list::const_iterator pif
= ifields
->begin();
9344 go_assert(pif
->is_field_name("_type"));
9345 const int rt
= RUNTIME_TYPE_KIND_INTERFACE
;
9346 ivals
->push_back(this->type_descriptor_constructor(gogo
, rt
, name
, NULL
,
9350 go_assert(pif
->is_field_name("methods"));
9352 Expression_list
* methods
= new Expression_list();
9353 if (this->all_methods_
!= NULL
)
9355 Type
* elemtype
= pif
->type()->array_type()->element_type();
9357 methods
->reserve(this->all_methods_
->size());
9358 for (Typed_identifier_list::const_iterator pm
=
9359 this->all_methods_
->begin();
9360 pm
!= this->all_methods_
->end();
9363 const Struct_field_list
* mfields
= elemtype
->struct_type()->fields();
9365 Expression_list
* mvals
= new Expression_list();
9368 Struct_field_list::const_iterator pmf
= mfields
->begin();
9369 go_assert(pmf
->is_field_name("name"));
9370 std::string s
= Gogo::unpack_hidden_name(pm
->name());
9371 Expression
* e
= Expression::make_string(s
, bloc
);
9372 mvals
->push_back(Expression::make_unary(OPERATOR_AND
, e
, bloc
));
9375 go_assert(pmf
->is_field_name("pkgPath"));
9376 if (!Gogo::is_hidden_name(pm
->name()))
9377 mvals
->push_back(Expression::make_nil(bloc
));
9380 s
= Gogo::hidden_name_pkgpath(pm
->name());
9381 e
= Expression::make_string(s
, bloc
);
9382 mvals
->push_back(Expression::make_unary(OPERATOR_AND
, e
, bloc
));
9386 go_assert(pmf
->is_field_name("typ"));
9387 mvals
->push_back(Expression::make_type_descriptor(pm
->type(), bloc
));
9390 go_assert(pmf
== mfields
->end());
9392 e
= Expression::make_struct_composite_literal(elemtype
, mvals
,
9394 methods
->push_back(e
);
9398 ivals
->push_back(Expression::make_slice_composite_literal(pif
->type(),
9402 go_assert(pif
== ifields
->end());
9404 return Expression::make_struct_composite_literal(itdt
, ivals
, bloc
);
9407 // Reflection string.
9410 Interface_type::do_reflection(Gogo
* gogo
, std::string
* ret
) const
9412 ret
->append("interface {");
9413 const Typed_identifier_list
* methods
= this->parse_methods_
;
9414 if (methods
!= NULL
)
9416 ret
->push_back(' ');
9417 for (Typed_identifier_list::const_iterator p
= methods
->begin();
9418 p
!= methods
->end();
9421 if (p
!= methods
->begin())
9423 if (p
->name().empty())
9424 this->append_reflection(p
->type(), gogo
, ret
);
9427 if (!Gogo::is_hidden_name(p
->name()))
9428 ret
->append(p
->name());
9429 else if (gogo
->pkgpath_from_option())
9430 ret
->append(p
->name().substr(1));
9433 // If no -fgo-pkgpath option, backward compatibility
9434 // for how this used to work before -fgo-pkgpath was
9436 std::string pkgpath
= Gogo::hidden_name_pkgpath(p
->name());
9437 ret
->append(pkgpath
.substr(pkgpath
.find('.') + 1));
9438 ret
->push_back('.');
9439 ret
->append(Gogo::unpack_hidden_name(p
->name()));
9441 std::string sub
= p
->type()->reflection(gogo
);
9442 go_assert(sub
.compare(0, 4, "func") == 0);
9443 sub
= sub
.substr(4);
9447 ret
->push_back(' ');
9455 Interface_type::do_export(Export
* exp
) const
9457 exp
->write_c_string("interface { ");
9459 const Typed_identifier_list
* methods
= this->parse_methods_
;
9460 if (methods
!= NULL
)
9462 for (Typed_identifier_list::const_iterator pm
= methods
->begin();
9463 pm
!= methods
->end();
9466 if (pm
->name().empty())
9468 exp
->write_c_string("? ");
9469 exp
->write_type(pm
->type());
9473 exp
->write_string(pm
->name());
9474 exp
->write_c_string(" (");
9476 const Function_type
* fntype
= pm
->type()->function_type();
9479 const Typed_identifier_list
* parameters
= fntype
->parameters();
9480 if (parameters
!= NULL
)
9482 bool is_varargs
= fntype
->is_varargs();
9483 for (Typed_identifier_list::const_iterator pp
=
9484 parameters
->begin();
9485 pp
!= parameters
->end();
9491 exp
->write_c_string(", ");
9492 exp
->write_name(pp
->name());
9493 exp
->write_c_string(" ");
9494 if (!is_varargs
|| pp
+ 1 != parameters
->end())
9495 exp
->write_type(pp
->type());
9498 exp
->write_c_string("...");
9499 Type
*pptype
= pp
->type();
9500 exp
->write_type(pptype
->array_type()->element_type());
9505 exp
->write_c_string(")");
9507 const Typed_identifier_list
* results
= fntype
->results();
9508 if (results
!= NULL
)
9510 exp
->write_c_string(" ");
9511 if (results
->size() == 1 && results
->begin()->name().empty())
9512 exp
->write_type(results
->begin()->type());
9516 exp
->write_c_string("(");
9517 for (Typed_identifier_list::const_iterator p
=
9519 p
!= results
->end();
9525 exp
->write_c_string(", ");
9526 exp
->write_name(p
->name());
9527 exp
->write_c_string(" ");
9528 exp
->write_type(p
->type());
9530 exp
->write_c_string(")");
9535 exp
->write_c_string("; ");
9539 exp
->write_c_string("}");
9542 // Import an interface type.
9545 Interface_type::do_import(Import
* imp
)
9547 imp
->require_c_string("interface { ");
9549 Typed_identifier_list
* methods
= new Typed_identifier_list
;
9550 while (imp
->peek_char() != '}')
9552 std::string name
= imp
->read_identifier();
9556 imp
->require_c_string(" ");
9557 Type
* t
= imp
->read_type();
9558 methods
->push_back(Typed_identifier("", t
, imp
->location()));
9559 imp
->require_c_string("; ");
9563 imp
->require_c_string(" (");
9565 Typed_identifier_list
* parameters
;
9566 bool is_varargs
= false;
9567 if (imp
->peek_char() == ')')
9571 parameters
= new Typed_identifier_list
;
9574 std::string name
= imp
->read_name();
9575 imp
->require_c_string(" ");
9577 if (imp
->match_c_string("..."))
9583 Type
* ptype
= imp
->read_type();
9585 ptype
= Type::make_array_type(ptype
, NULL
);
9586 parameters
->push_back(Typed_identifier(name
, ptype
,
9588 if (imp
->peek_char() != ',')
9590 go_assert(!is_varargs
);
9591 imp
->require_c_string(", ");
9594 imp
->require_c_string(")");
9596 Typed_identifier_list
* results
;
9597 if (imp
->peek_char() != ' ')
9601 results
= new Typed_identifier_list
;
9603 if (imp
->peek_char() != '(')
9605 Type
* rtype
= imp
->read_type();
9606 results
->push_back(Typed_identifier("", rtype
, imp
->location()));
9613 std::string name
= imp
->read_name();
9614 imp
->require_c_string(" ");
9615 Type
* rtype
= imp
->read_type();
9616 results
->push_back(Typed_identifier(name
, rtype
,
9618 if (imp
->peek_char() != ',')
9620 imp
->require_c_string(", ");
9622 imp
->require_c_string(")");
9626 Function_type
* fntype
= Type::make_function_type(NULL
, parameters
,
9630 fntype
->set_is_varargs();
9631 methods
->push_back(Typed_identifier(name
, fntype
, imp
->location()));
9633 imp
->require_c_string("; ");
9636 imp
->require_c_string("}");
9638 if (methods
->empty())
9644 Interface_type
* ret
= Type::make_interface_type(methods
, imp
->location());
9645 ret
->package_
= imp
->package();
9649 // Make an interface type.
9652 Type::make_interface_type(Typed_identifier_list
* methods
,
9655 return new Interface_type(methods
, location
);
9658 // Make an empty interface type.
9661 Type::make_empty_interface_type(Location location
)
9663 Interface_type
* ret
= new Interface_type(NULL
, location
);
9664 ret
->finalize_methods();
9670 // Bind a method to an object.
9673 Method::bind_method(Expression
* expr
, Location location
) const
9675 if (this->stub_
== NULL
)
9677 // When there is no stub object, the binding is determined by
9679 return this->do_bind_method(expr
, location
);
9681 return Expression::make_bound_method(expr
, this, this->stub_
, location
);
9684 // Return the named object associated with a method. This may only be
9685 // called after methods are finalized.
9688 Method::named_object() const
9690 if (this->stub_
!= NULL
)
9692 return this->do_named_object();
9695 // Class Named_method.
9697 // The type of the method.
9700 Named_method::do_type() const
9702 if (this->named_object_
->is_function())
9703 return this->named_object_
->func_value()->type();
9704 else if (this->named_object_
->is_function_declaration())
9705 return this->named_object_
->func_declaration_value()->type();
9710 // Return the location of the method receiver.
9713 Named_method::do_receiver_location() const
9715 return this->do_type()->receiver()->location();
9718 // Bind a method to an object.
9721 Named_method::do_bind_method(Expression
* expr
, Location location
) const
9723 Named_object
* no
= this->named_object_
;
9724 Bound_method_expression
* bme
= Expression::make_bound_method(expr
, this,
9726 // If this is not a local method, and it does not use a stub, then
9727 // the real method expects a different type. We need to cast the
9729 if (this->depth() > 0 && !this->needs_stub_method())
9731 Function_type
* ftype
= this->do_type();
9732 go_assert(ftype
->is_method());
9733 Type
* frtype
= ftype
->receiver()->type();
9734 bme
->set_first_argument_type(frtype
);
9739 // Return whether this method should not participate in interfaces.
9742 Named_method::do_nointerface() const
9744 Named_object
* no
= this->named_object_
;
9745 if (no
->is_function())
9746 return no
->func_value()->nointerface();
9747 else if (no
->is_function_declaration())
9748 return no
->func_declaration_value()->nointerface();
9753 // Class Interface_method.
9755 // Bind a method to an object.
9758 Interface_method::do_bind_method(Expression
* expr
,
9759 Location location
) const
9761 return Expression::make_interface_field_reference(expr
, this->name_
,
9767 // Insert a new method. Return true if it was inserted, false
9771 Methods::insert(const std::string
& name
, Method
* m
)
9773 std::pair
<Method_map::iterator
, bool> ins
=
9774 this->methods_
.insert(std::make_pair(name
, m
));
9779 Method
* old_method
= ins
.first
->second
;
9780 if (m
->depth() < old_method
->depth())
9783 ins
.first
->second
= m
;
9788 if (m
->depth() == old_method
->depth())
9789 old_method
->set_is_ambiguous();
9795 // Return the number of unambiguous methods.
9798 Methods::count() const
9801 for (Method_map::const_iterator p
= this->methods_
.begin();
9802 p
!= this->methods_
.end();
9804 if (!p
->second
->is_ambiguous())
9809 // Class Named_type.
9811 // Return the name of the type.
9814 Named_type::name() const
9816 return this->named_object_
->name();
9819 // Return the name of the type to use in an error message.
9822 Named_type::message_name() const
9824 return this->named_object_
->message_name();
9827 // Return the base type for this type. We have to be careful about
9828 // circular type definitions, which are invalid but may be seen here.
9831 Named_type::named_base()
9836 Type
* ret
= this->type_
->base();
9837 this->seen_
= false;
9842 Named_type::named_base() const
9847 const Type
* ret
= this->type_
->base();
9848 this->seen_
= false;
9852 // Return whether this is an error type. We have to be careful about
9853 // circular type definitions, which are invalid but may be seen here.
9856 Named_type::is_named_error_type() const
9861 bool ret
= this->type_
->is_error_type();
9862 this->seen_
= false;
9866 // Whether this type is comparable. We have to be careful about
9867 // circular type definitions.
9870 Named_type::named_type_is_comparable(std::string
* reason
) const
9875 bool ret
= Type::are_compatible_for_comparison(true, this->type_
,
9876 this->type_
, reason
);
9877 this->seen_
= false;
9881 // Add a method to this type.
9884 Named_type::add_method(const std::string
& name
, Function
* function
)
9886 go_assert(!this->is_alias_
);
9887 if (this->local_methods_
== NULL
)
9888 this->local_methods_
= new Bindings(NULL
);
9889 return this->local_methods_
->add_function(name
, NULL
, function
);
9892 // Add a method declaration to this type.
9895 Named_type::add_method_declaration(const std::string
& name
, Package
* package
,
9896 Function_type
* type
,
9899 go_assert(!this->is_alias_
);
9900 if (this->local_methods_
== NULL
)
9901 this->local_methods_
= new Bindings(NULL
);
9902 return this->local_methods_
->add_function_declaration(name
, package
, type
,
9906 // Add an existing method to this type.
9909 Named_type::add_existing_method(Named_object
* no
)
9911 go_assert(!this->is_alias_
);
9912 if (this->local_methods_
== NULL
)
9913 this->local_methods_
= new Bindings(NULL
);
9914 this->local_methods_
->add_named_object(no
);
9917 // Look for a local method NAME, and returns its named object, or NULL
9921 Named_type::find_local_method(const std::string
& name
) const
9923 if (this->is_error_
)
9925 if (this->is_alias_
)
9927 Named_type
* nt
= this->type_
->named_type();
9930 if (this->seen_alias_
)
9932 this->seen_alias_
= true;
9933 Named_object
* ret
= nt
->find_local_method(name
);
9934 this->seen_alias_
= false;
9939 if (this->local_methods_
== NULL
)
9941 return this->local_methods_
->lookup(name
);
9944 // Return the list of local methods.
9947 Named_type::local_methods() const
9949 if (this->is_error_
)
9951 if (this->is_alias_
)
9953 Named_type
* nt
= this->type_
->named_type();
9956 if (this->seen_alias_
)
9958 this->seen_alias_
= true;
9959 const Bindings
* ret
= nt
->local_methods();
9960 this->seen_alias_
= false;
9965 return this->local_methods_
;
9968 // Return whether NAME is an unexported field or method, for better
9972 Named_type::is_unexported_local_method(Gogo
* gogo
,
9973 const std::string
& name
) const
9975 if (this->is_error_
)
9977 if (this->is_alias_
)
9979 Named_type
* nt
= this->type_
->named_type();
9982 if (this->seen_alias_
)
9984 this->seen_alias_
= true;
9985 bool ret
= nt
->is_unexported_local_method(gogo
, name
);
9986 this->seen_alias_
= false;
9991 Bindings
* methods
= this->local_methods_
;
9992 if (methods
!= NULL
)
9994 for (Bindings::const_declarations_iterator p
=
9995 methods
->begin_declarations();
9996 p
!= methods
->end_declarations();
9999 if (Gogo::is_hidden_name(p
->first
)
10000 && name
== Gogo::unpack_hidden_name(p
->first
)
10001 && gogo
->pack_hidden_name(name
, false) != p
->first
)
10008 // Build the complete list of methods for this type, which means
10009 // recursively including all methods for anonymous fields. Create all
10013 Named_type::finalize_methods(Gogo
* gogo
)
10015 if (this->is_alias_
)
10017 if (this->all_methods_
!= NULL
)
10020 if (this->local_methods_
!= NULL
10021 && (this->points_to() != NULL
|| this->interface_type() != NULL
))
10023 const Bindings
* lm
= this->local_methods_
;
10024 for (Bindings::const_declarations_iterator p
= lm
->begin_declarations();
10025 p
!= lm
->end_declarations();
10027 go_error_at(p
->second
->location(),
10028 "invalid pointer or interface receiver type");
10029 delete this->local_methods_
;
10030 this->local_methods_
= NULL
;
10034 Type::finalize_methods(gogo
, this, this->location_
, &this->all_methods_
);
10037 // Return whether this type has any methods.
10040 Named_type::has_any_methods() const
10042 if (this->is_error_
)
10044 if (this->is_alias_
)
10046 if (this->type_
->named_type() != NULL
)
10048 if (this->seen_alias_
)
10050 this->seen_alias_
= true;
10051 bool ret
= this->type_
->named_type()->has_any_methods();
10052 this->seen_alias_
= false;
10055 if (this->type_
->struct_type() != NULL
)
10056 return this->type_
->struct_type()->has_any_methods();
10059 return this->all_methods_
!= NULL
;
10062 // Return the methods for this type.
10065 Named_type::methods() const
10067 if (this->is_error_
)
10069 if (this->is_alias_
)
10071 if (this->type_
->named_type() != NULL
)
10073 if (this->seen_alias_
)
10075 this->seen_alias_
= true;
10076 const Methods
* ret
= this->type_
->named_type()->methods();
10077 this->seen_alias_
= false;
10080 if (this->type_
->struct_type() != NULL
)
10081 return this->type_
->struct_type()->methods();
10084 return this->all_methods_
;
10087 // Return the method NAME, or NULL if there isn't one or if it is
10088 // ambiguous. Set *IS_AMBIGUOUS if the method exists but is
10092 Named_type::method_function(const std::string
& name
, bool* is_ambiguous
) const
10094 if (this->is_error_
)
10096 if (this->is_alias_
)
10098 if (is_ambiguous
!= NULL
)
10099 *is_ambiguous
= false;
10100 if (this->type_
->named_type() != NULL
)
10102 if (this->seen_alias_
)
10104 this->seen_alias_
= true;
10105 Named_type
* nt
= this->type_
->named_type();
10106 Method
* ret
= nt
->method_function(name
, is_ambiguous
);
10107 this->seen_alias_
= false;
10110 if (this->type_
->struct_type() != NULL
)
10111 return this->type_
->struct_type()->method_function(name
, is_ambiguous
);
10114 return Type::method_function(this->all_methods_
, name
, is_ambiguous
);
10117 // Return a pointer to the interface method table for this type for
10118 // the interface INTERFACE. IS_POINTER is true if this is for a
10119 // pointer to THIS.
10122 Named_type::interface_method_table(Interface_type
* interface
, bool is_pointer
)
10124 if (this->is_error_
)
10125 return Expression::make_error(this->location_
);
10126 if (this->is_alias_
)
10128 if (this->type_
->named_type() != NULL
)
10130 if (this->seen_alias_
)
10131 return Expression::make_error(this->location_
);
10132 this->seen_alias_
= true;
10133 Named_type
* nt
= this->type_
->named_type();
10134 Expression
* ret
= nt
->interface_method_table(interface
, is_pointer
);
10135 this->seen_alias_
= false;
10138 if (this->type_
->struct_type() != NULL
)
10139 return this->type_
->struct_type()->interface_method_table(interface
,
10143 return Type::interface_method_table(this, interface
, is_pointer
,
10144 &this->interface_method_tables_
,
10145 &this->pointer_interface_method_tables_
);
10148 // Look for a use of a complete type within another type. This is
10149 // used to check that we don't try to use a type within itself.
10151 class Find_type_use
: public Traverse
10154 Find_type_use(Named_type
* find_type
)
10155 : Traverse(traverse_types
),
10156 find_type_(find_type
), found_(false)
10159 // Whether we found the type.
10162 { return this->found_
; }
10169 // The type we are looking for.
10170 Named_type
* find_type_
;
10171 // Whether we found the type.
10175 // Check for FIND_TYPE in TYPE.
10178 Find_type_use::type(Type
* type
)
10180 if (type
->named_type() != NULL
&& this->find_type_
== type
->named_type())
10182 this->found_
= true;
10183 return TRAVERSE_EXIT
;
10186 // It's OK if we see a reference to the type in any type which is
10187 // essentially a pointer: a pointer, a slice, a function, a map, or
10189 if (type
->points_to() != NULL
10190 || type
->is_slice_type()
10191 || type
->function_type() != NULL
10192 || type
->map_type() != NULL
10193 || type
->channel_type() != NULL
)
10194 return TRAVERSE_SKIP_COMPONENTS
;
10196 // For an interface, a reference to the type in a method type should
10197 // be ignored, but we have to consider direct inheritance. When
10198 // this is called, there may be cases of direct inheritance
10199 // represented as a method with no name.
10200 if (type
->interface_type() != NULL
)
10202 const Typed_identifier_list
* methods
= type
->interface_type()->methods();
10203 if (methods
!= NULL
)
10205 for (Typed_identifier_list::const_iterator p
= methods
->begin();
10206 p
!= methods
->end();
10209 if (p
->name().empty())
10211 if (Type::traverse(p
->type(), this) == TRAVERSE_EXIT
)
10212 return TRAVERSE_EXIT
;
10216 return TRAVERSE_SKIP_COMPONENTS
;
10219 // Otherwise, FIND_TYPE_ depends on TYPE, in the sense that we need
10220 // to convert TYPE to the backend representation before we convert
10222 if (type
->named_type() != NULL
)
10224 switch (type
->base()->classification())
10226 case Type::TYPE_ERROR
:
10227 case Type::TYPE_BOOLEAN
:
10228 case Type::TYPE_INTEGER
:
10229 case Type::TYPE_FLOAT
:
10230 case Type::TYPE_COMPLEX
:
10231 case Type::TYPE_STRING
:
10232 case Type::TYPE_NIL
:
10235 case Type::TYPE_ARRAY
:
10236 case Type::TYPE_STRUCT
:
10237 this->find_type_
->add_dependency(type
->named_type());
10240 case Type::TYPE_NAMED
:
10241 case Type::TYPE_FORWARD
:
10242 go_assert(saw_errors());
10245 case Type::TYPE_VOID
:
10246 case Type::TYPE_SINK
:
10247 case Type::TYPE_FUNCTION
:
10248 case Type::TYPE_POINTER
:
10249 case Type::TYPE_CALL_MULTIPLE_RESULT
:
10250 case Type::TYPE_MAP
:
10251 case Type::TYPE_CHANNEL
:
10252 case Type::TYPE_INTERFACE
:
10258 return TRAVERSE_CONTINUE
;
10261 // Look for a circular reference of an alias.
10263 class Find_alias
: public Traverse
10266 Find_alias(Named_type
* find_type
)
10267 : Traverse(traverse_types
),
10268 find_type_(find_type
), found_(false)
10271 // Whether we found the type.
10274 { return this->found_
; }
10281 // The type we are looking for.
10282 Named_type
* find_type_
;
10283 // Whether we found the type.
10288 Find_alias::type(Type
* type
)
10290 Named_type
* nt
= type
->named_type();
10293 if (nt
== this->find_type_
)
10295 this->found_
= true;
10296 return TRAVERSE_EXIT
;
10299 // We started from `type T1 = T2`, where T1 is find_type_ and T2
10300 // is, perhaps indirectly, the parameter TYPE. If TYPE is not
10301 // an alias itself, it's OK if whatever T2 is defined as refers
10303 if (!nt
->is_alias())
10304 return TRAVERSE_SKIP_COMPONENTS
;
10307 return TRAVERSE_CONTINUE
;
10310 // Verify that a named type does not refer to itself.
10313 Named_type::do_verify()
10315 if (this->is_verified_
)
10317 this->is_verified_
= true;
10319 if (this->is_error_
)
10322 if (this->is_alias_
)
10324 Find_alias
find(this);
10325 Type::traverse(this->type_
, &find
);
10328 go_error_at(this->location_
, "invalid recursive alias %qs",
10329 this->message_name().c_str());
10330 this->is_error_
= true;
10335 Find_type_use
find(this);
10336 Type::traverse(this->type_
, &find
);
10339 go_error_at(this->location_
, "invalid recursive type %qs",
10340 this->message_name().c_str());
10341 this->is_error_
= true;
10345 // Check whether any of the local methods overloads an existing
10346 // struct field or interface method. We don't need to check the
10347 // list of methods against itself: that is handled by the Bindings
10349 if (this->local_methods_
!= NULL
)
10351 Struct_type
* st
= this->type_
->struct_type();
10354 for (Bindings::const_declarations_iterator p
=
10355 this->local_methods_
->begin_declarations();
10356 p
!= this->local_methods_
->end_declarations();
10359 const std::string
& name(p
->first
);
10360 if (st
!= NULL
&& st
->find_local_field(name
, NULL
) != NULL
)
10362 go_error_at(p
->second
->location(),
10363 "method %qs redeclares struct field name",
10364 Gogo::message_name(name
).c_str());
10373 // Return whether this type is or contains a pointer.
10376 Named_type::do_has_pointer() const
10380 this->seen_
= true;
10381 bool ret
= this->type_
->has_pointer();
10382 this->seen_
= false;
10386 // Return whether comparisons for this type can use the identity
10390 Named_type::do_compare_is_identity(Gogo
* gogo
)
10392 // We don't use this->seen_ here because compare_is_identity may
10393 // call base() later, and that will mess up if seen_ is set here.
10394 if (this->seen_in_compare_is_identity_
)
10396 this->seen_in_compare_is_identity_
= true;
10397 bool ret
= this->type_
->compare_is_identity(gogo
);
10398 this->seen_in_compare_is_identity_
= false;
10402 // Return whether this type is reflexive--whether it is always equal
10406 Named_type::do_is_reflexive()
10408 if (this->seen_in_compare_is_identity_
)
10410 this->seen_in_compare_is_identity_
= true;
10411 bool ret
= this->type_
->is_reflexive();
10412 this->seen_in_compare_is_identity_
= false;
10416 // Return whether this type needs a key update when used as a map key.
10419 Named_type::do_needs_key_update()
10421 if (this->seen_in_compare_is_identity_
)
10423 this->seen_in_compare_is_identity_
= true;
10424 bool ret
= this->type_
->needs_key_update();
10425 this->seen_in_compare_is_identity_
= false;
10429 // Return a hash code. This is used for method lookup. We simply
10430 // hash on the name itself.
10433 Named_type::do_hash_for_method(Gogo
* gogo
) const
10435 if (this->is_error_
)
10438 // Aliases are handled in Type::hash_for_method.
10439 go_assert(!this->is_alias_
);
10441 const std::string
& name(this->named_object()->name());
10442 unsigned int ret
= Type::hash_string(name
, 0);
10444 // GOGO will be NULL here when called from Type_hash_identical.
10445 // That is OK because that is only used for internal hash tables
10446 // where we are going to be comparing named types for equality. In
10447 // other cases, which are cases where the runtime is going to
10448 // compare hash codes to see if the types are the same, we need to
10449 // include the pkgpath in the hash.
10450 if (gogo
!= NULL
&& !Gogo::is_hidden_name(name
) && !this->is_builtin())
10452 const Package
* package
= this->named_object()->package();
10453 if (package
== NULL
)
10454 ret
= Type::hash_string(gogo
->pkgpath(), ret
);
10456 ret
= Type::hash_string(package
->pkgpath(), ret
);
10462 // Convert a named type to the backend representation. In order to
10463 // get dependencies right, we fill in a dummy structure for this type,
10464 // then convert all the dependencies, then complete this type. When
10465 // this function is complete, the size of the type is known.
10468 Named_type::convert(Gogo
* gogo
)
10470 if (this->is_error_
|| this->is_converted_
)
10473 this->create_placeholder(gogo
);
10475 // If we are called to turn unsafe.Sizeof into a constant, we may
10476 // not have verified the type yet. We have to make sure it is
10477 // verified, since that sets the list of dependencies.
10480 // Convert all the dependencies. If they refer indirectly back to
10481 // this type, they will pick up the intermediate representation we just
10483 for (std::vector
<Named_type
*>::const_iterator p
= this->dependencies_
.begin();
10484 p
!= this->dependencies_
.end();
10486 (*p
)->convert(gogo
);
10488 // Complete this type.
10489 Btype
* bt
= this->named_btype_
;
10490 Type
* base
= this->type_
->base();
10491 switch (base
->classification())
10506 case TYPE_FUNCTION
:
10508 // The size of these types is already correct. We don't worry
10509 // about filling them in until later, when we also track
10510 // circular references.
10515 std::vector
<Backend::Btyped_identifier
> bfields
;
10516 get_backend_struct_fields(gogo
, base
->struct_type()->fields(),
10518 if (!gogo
->backend()->set_placeholder_struct_type(bt
, bfields
))
10519 bt
= gogo
->backend()->error_type();
10524 // Slice types were completed in create_placeholder.
10525 if (!base
->is_slice_type())
10527 Btype
* bet
= base
->array_type()->get_backend_element(gogo
, true);
10528 Bexpression
* blen
= base
->array_type()->get_backend_length(gogo
);
10529 if (!gogo
->backend()->set_placeholder_array_type(bt
, bet
, blen
))
10530 bt
= gogo
->backend()->error_type();
10534 case TYPE_INTERFACE
:
10535 // Interface types were completed in create_placeholder.
10543 case TYPE_CALL_MULTIPLE_RESULT
:
10549 this->named_btype_
= bt
;
10550 this->is_converted_
= true;
10551 this->is_placeholder_
= false;
10554 // Create the placeholder for a named type. This is the first step in
10555 // converting to the backend representation.
10558 Named_type::create_placeholder(Gogo
* gogo
)
10560 if (this->is_error_
)
10561 this->named_btype_
= gogo
->backend()->error_type();
10563 if (this->named_btype_
!= NULL
)
10566 // Create the structure for this type. Note that because we call
10567 // base() here, we don't attempt to represent a named type defined
10568 // as another named type. Instead both named types will point to
10569 // different base representations.
10570 Type
* base
= this->type_
->base();
10572 bool set_name
= true;
10573 switch (base
->classification())
10576 this->is_error_
= true;
10577 this->named_btype_
= gogo
->backend()->error_type();
10587 // These are simple basic types, we can just create them
10589 bt
= Type::get_named_base_btype(gogo
, base
);
10594 // All maps and channels have the same backend representation.
10595 bt
= Type::get_named_base_btype(gogo
, base
);
10598 case TYPE_FUNCTION
:
10601 bool for_function
= base
->classification() == TYPE_FUNCTION
;
10602 bt
= gogo
->backend()->placeholder_pointer_type(this->name(),
10610 bt
= gogo
->backend()->placeholder_struct_type(this->name(),
10612 this->is_placeholder_
= true;
10617 if (base
->is_slice_type())
10618 bt
= gogo
->backend()->placeholder_struct_type(this->name(),
10622 bt
= gogo
->backend()->placeholder_array_type(this->name(),
10624 this->is_placeholder_
= true;
10629 case TYPE_INTERFACE
:
10630 if (base
->interface_type()->is_empty())
10631 bt
= Interface_type::get_backend_empty_interface_type(gogo
);
10634 bt
= gogo
->backend()->placeholder_struct_type(this->name(),
10642 case TYPE_CALL_MULTIPLE_RESULT
:
10649 bt
= gogo
->backend()->named_type(this->name(), bt
, this->location_
);
10651 this->named_btype_
= bt
;
10653 if (base
->is_slice_type())
10655 // We do not record slices as dependencies of other types,
10656 // because we can fill them in completely here with the final
10658 std::vector
<Backend::Btyped_identifier
> bfields
;
10659 get_backend_slice_fields(gogo
, base
->array_type(), true, &bfields
);
10660 if (!gogo
->backend()->set_placeholder_struct_type(bt
, bfields
))
10661 this->named_btype_
= gogo
->backend()->error_type();
10663 else if (base
->interface_type() != NULL
10664 && !base
->interface_type()->is_empty())
10666 // We do not record interfaces as dependencies of other types,
10667 // because we can fill them in completely here with the final
10669 std::vector
<Backend::Btyped_identifier
> bfields
;
10670 get_backend_interface_fields(gogo
, base
->interface_type(), true,
10672 if (!gogo
->backend()->set_placeholder_struct_type(bt
, bfields
))
10673 this->named_btype_
= gogo
->backend()->error_type();
10677 // Get the backend representation for a named type.
10680 Named_type::do_get_backend(Gogo
* gogo
)
10682 if (this->is_error_
)
10683 return gogo
->backend()->error_type();
10685 Btype
* bt
= this->named_btype_
;
10687 if (!gogo
->named_types_are_converted())
10689 // We have not completed converting named types. NAMED_BTYPE_
10690 // is a placeholder and we shouldn't do anything further.
10694 // We don't build dependencies for types whose sizes do not
10695 // change or are not relevant, so we may see them here while
10696 // converting types.
10697 this->create_placeholder(gogo
);
10698 bt
= this->named_btype_
;
10699 go_assert(bt
!= NULL
);
10703 // We are not converting types. This should only be called if the
10704 // type has already been converted.
10705 if (!this->is_converted_
)
10707 go_assert(saw_errors());
10708 return gogo
->backend()->error_type();
10711 go_assert(bt
!= NULL
);
10713 // Complete the backend representation.
10714 Type
* base
= this->type_
->base();
10716 switch (base
->classification())
10719 return gogo
->backend()->error_type();
10733 if (!this->seen_in_get_backend_
)
10735 this->seen_in_get_backend_
= true;
10736 base
->struct_type()->finish_backend_fields(gogo
);
10737 this->seen_in_get_backend_
= false;
10742 if (!this->seen_in_get_backend_
)
10744 this->seen_in_get_backend_
= true;
10745 base
->array_type()->finish_backend_element(gogo
);
10746 this->seen_in_get_backend_
= false;
10750 case TYPE_INTERFACE
:
10751 if (!this->seen_in_get_backend_
)
10753 this->seen_in_get_backend_
= true;
10754 base
->interface_type()->finish_backend_methods(gogo
);
10755 this->seen_in_get_backend_
= false;
10759 case TYPE_FUNCTION
:
10760 // Don't build a circular data structure. GENERIC can't handle
10762 if (this->seen_in_get_backend_
)
10763 return gogo
->backend()->circular_pointer_type(bt
, true);
10764 this->seen_in_get_backend_
= true;
10765 bt1
= Type::get_named_base_btype(gogo
, base
);
10766 this->seen_in_get_backend_
= false;
10767 if (!gogo
->backend()->set_placeholder_pointer_type(bt
, bt1
))
10768 bt
= gogo
->backend()->error_type();
10772 // Don't build a circular data structure. GENERIC can't handle
10774 if (this->seen_in_get_backend_
)
10775 return gogo
->backend()->circular_pointer_type(bt
, false);
10776 this->seen_in_get_backend_
= true;
10777 bt1
= Type::get_named_base_btype(gogo
, base
);
10778 this->seen_in_get_backend_
= false;
10779 if (!gogo
->backend()->set_placeholder_pointer_type(bt
, bt1
))
10780 bt
= gogo
->backend()->error_type();
10785 case TYPE_CALL_MULTIPLE_RESULT
:
10794 // Build a type descriptor for a named type.
10797 Named_type::do_type_descriptor(Gogo
* gogo
, Named_type
* name
)
10799 if (this->is_error_
)
10800 return Expression::make_error(this->location_
);
10801 if (name
== NULL
&& this->is_alias_
)
10803 if (this->seen_alias_
)
10804 return Expression::make_error(this->location_
);
10805 this->seen_alias_
= true;
10806 Expression
* ret
= this->type_
->type_descriptor(gogo
, NULL
);
10807 this->seen_alias_
= false;
10811 // If NAME is not NULL, then we don't really want the type
10812 // descriptor for this type; we want the descriptor for the
10813 // underlying type, giving it the name NAME.
10814 return this->named_type_descriptor(gogo
, this->type_
,
10815 name
== NULL
? this : name
);
10818 // Add to the reflection string. This is used mostly for the name of
10819 // the type used in a type descriptor, not for actual reflection
10823 Named_type::do_reflection(Gogo
* gogo
, std::string
* ret
) const
10825 this->append_reflection_type_name(gogo
, false, ret
);
10828 // Add to the reflection string. For an alias we normally use the
10829 // real name, but if USE_ALIAS is true we use the alias name itself.
10832 Named_type::append_reflection_type_name(Gogo
* gogo
, bool use_alias
,
10833 std::string
* ret
) const
10835 if (this->is_error_
)
10837 if (this->is_alias_
&& !use_alias
)
10839 if (this->seen_alias_
)
10841 this->seen_alias_
= true;
10842 this->append_reflection(this->type_
, gogo
, ret
);
10843 this->seen_alias_
= false;
10846 if (!this->is_builtin())
10848 // When -fgo-pkgpath or -fgo-prefix is specified, we use it to
10849 // make a unique reflection string, so that the type
10850 // canonicalization in the reflect package will work. In order
10851 // to be compatible with the gc compiler, we put tabs into the
10852 // package path, so that the reflect methods can discard it.
10853 const Package
* package
= this->named_object_
->package();
10854 ret
->push_back('\t');
10855 ret
->append(package
!= NULL
10856 ? package
->pkgpath_symbol()
10857 : gogo
->pkgpath_symbol());
10858 ret
->push_back('\t');
10859 ret
->append(package
!= NULL
10860 ? package
->package_name()
10861 : gogo
->package_name());
10862 ret
->push_back('.');
10864 if (this->in_function_
!= NULL
)
10866 ret
->push_back('\t');
10867 const Typed_identifier
* rcvr
=
10868 this->in_function_
->func_value()->type()->receiver();
10871 Named_type
* rcvr_type
= rcvr
->type()->deref()->named_type();
10872 ret
->append(Gogo::unpack_hidden_name(rcvr_type
->name()));
10873 ret
->push_back('.');
10875 ret
->append(Gogo::unpack_hidden_name(this->in_function_
->name()));
10876 ret
->push_back('$');
10877 if (this->in_function_index_
> 0)
10880 snprintf(buf
, sizeof buf
, "%u", this->in_function_index_
);
10882 ret
->push_back('$');
10884 ret
->push_back('\t');
10886 ret
->append(Gogo::unpack_hidden_name(this->named_object_
->name()));
10889 // Export the type. This is called to export a global type.
10892 Named_type::export_named_type(Export
* exp
, const std::string
&) const
10894 // We don't need to write the name of the type here, because it will
10895 // be written by Export::write_type anyhow.
10896 exp
->write_c_string("type ");
10897 exp
->write_type(this);
10898 exp
->write_c_string(";\n");
10901 // Import a named type.
10904 Named_type::import_named_type(Import
* imp
, Named_type
** ptype
)
10906 imp
->require_c_string("type ");
10907 Type
*type
= imp
->read_type();
10908 *ptype
= type
->named_type();
10909 go_assert(*ptype
!= NULL
);
10910 imp
->require_c_string(";\n");
10913 // Export the type when it is referenced by another type. In this
10914 // case Export::export_type will already have issued the name.
10917 Named_type::do_export(Export
* exp
) const
10919 exp
->write_type(this->type_
);
10921 // To save space, we only export the methods directly attached to
10923 Bindings
* methods
= this->local_methods_
;
10924 if (methods
== NULL
)
10927 exp
->write_c_string("\n");
10928 for (Bindings::const_definitions_iterator p
= methods
->begin_definitions();
10929 p
!= methods
->end_definitions();
10932 exp
->write_c_string(" ");
10933 (*p
)->export_named_object(exp
);
10936 for (Bindings::const_declarations_iterator p
= methods
->begin_declarations();
10937 p
!= methods
->end_declarations();
10940 if (p
->second
->is_function_declaration())
10942 exp
->write_c_string(" ");
10943 p
->second
->export_named_object(exp
);
10948 // Make a named type.
10951 Type::make_named_type(Named_object
* named_object
, Type
* type
,
10954 return new Named_type(named_object
, type
, location
);
10957 // Finalize the methods for TYPE. It will be a named type or a struct
10958 // type. This sets *ALL_METHODS to the list of methods, and builds
10959 // all required stubs.
10962 Type::finalize_methods(Gogo
* gogo
, const Type
* type
, Location location
,
10963 Methods
** all_methods
)
10965 *all_methods
= new Methods();
10966 std::vector
<const Named_type
*> seen
;
10967 Type::add_methods_for_type(type
, NULL
, 0, false, false, &seen
, *all_methods
);
10968 if ((*all_methods
)->empty())
10970 delete *all_methods
;
10971 *all_methods
= NULL
;
10973 Type::build_stub_methods(gogo
, type
, *all_methods
, location
);
10976 // Add the methods for TYPE to *METHODS. FIELD_INDEXES is used to
10977 // build up the struct field indexes as we go. DEPTH is the depth of
10978 // the field within TYPE. IS_EMBEDDED_POINTER is true if we are
10979 // adding these methods for an anonymous field with pointer type.
10980 // NEEDS_STUB_METHOD is true if we need to use a stub method which
10981 // calls the real method. TYPES_SEEN is used to avoid infinite
10985 Type::add_methods_for_type(const Type
* type
,
10986 const Method::Field_indexes
* field_indexes
,
10987 unsigned int depth
,
10988 bool is_embedded_pointer
,
10989 bool needs_stub_method
,
10990 std::vector
<const Named_type
*>* seen
,
10993 // Pointer types may not have methods.
10994 if (type
->points_to() != NULL
)
10997 const Named_type
* nt
= type
->named_type();
11000 for (std::vector
<const Named_type
*>::const_iterator p
= seen
->begin();
11008 seen
->push_back(nt
);
11010 Type::add_local_methods_for_type(nt
, field_indexes
, depth
,
11011 is_embedded_pointer
, needs_stub_method
,
11015 Type::add_embedded_methods_for_type(type
, field_indexes
, depth
,
11016 is_embedded_pointer
, needs_stub_method
,
11019 // If we are called with depth > 0, then we are looking at an
11020 // anonymous field of a struct. If such a field has interface type,
11021 // then we need to add the interface methods. We don't want to add
11022 // them when depth == 0, because we will already handle them
11023 // following the usual rules for an interface type.
11025 Type::add_interface_methods_for_type(type
, field_indexes
, depth
, methods
);
11031 // Add the local methods for the named type NT to *METHODS. The
11032 // parameters are as for add_methods_to_type.
11035 Type::add_local_methods_for_type(const Named_type
* nt
,
11036 const Method::Field_indexes
* field_indexes
,
11037 unsigned int depth
,
11038 bool is_embedded_pointer
,
11039 bool needs_stub_method
,
11042 const Bindings
* local_methods
= nt
->local_methods();
11043 if (local_methods
== NULL
)
11046 for (Bindings::const_declarations_iterator p
=
11047 local_methods
->begin_declarations();
11048 p
!= local_methods
->end_declarations();
11051 Named_object
* no
= p
->second
;
11052 bool is_value_method
= (is_embedded_pointer
11053 || !Type::method_expects_pointer(no
));
11054 Method
* m
= new Named_method(no
, field_indexes
, depth
, is_value_method
,
11055 (needs_stub_method
|| depth
> 0));
11056 if (!methods
->insert(no
->name(), m
))
11061 // Add the embedded methods for TYPE to *METHODS. These are the
11062 // methods attached to anonymous fields. The parameters are as for
11063 // add_methods_to_type.
11066 Type::add_embedded_methods_for_type(const Type
* type
,
11067 const Method::Field_indexes
* field_indexes
,
11068 unsigned int depth
,
11069 bool is_embedded_pointer
,
11070 bool needs_stub_method
,
11071 std::vector
<const Named_type
*>* seen
,
11074 // Look for anonymous fields in TYPE. TYPE has fields if it is a
11076 const Struct_type
* st
= type
->struct_type();
11080 const Struct_field_list
* fields
= st
->fields();
11081 if (fields
== NULL
)
11084 unsigned int i
= 0;
11085 for (Struct_field_list::const_iterator pf
= fields
->begin();
11086 pf
!= fields
->end();
11089 if (!pf
->is_anonymous())
11092 Type
* ftype
= pf
->type();
11093 bool is_pointer
= false;
11094 if (ftype
->points_to() != NULL
)
11096 ftype
= ftype
->points_to();
11099 Named_type
* fnt
= ftype
->named_type();
11102 // This is an error, but it will be diagnosed elsewhere.
11106 Method::Field_indexes
* sub_field_indexes
= new Method::Field_indexes();
11107 sub_field_indexes
->next
= field_indexes
;
11108 sub_field_indexes
->field_index
= i
;
11110 Methods tmp_methods
;
11111 Type::add_methods_for_type(fnt
, sub_field_indexes
, depth
+ 1,
11112 (is_embedded_pointer
|| is_pointer
),
11118 // Check if there are promoted methods that conflict with field names and
11119 // don't add them to the method map.
11120 for (Methods::const_iterator p
= tmp_methods
.begin();
11121 p
!= tmp_methods
.end();
11124 bool found
= false;
11125 for (Struct_field_list::const_iterator fp
= fields
->begin();
11126 fp
!= fields
->end();
11129 if (fp
->field_name() == p
->first
)
11136 !methods
->insert(p
->first
, p
->second
))
11142 // If TYPE is an interface type, then add its method to *METHODS.
11143 // This is for interface methods attached to an anonymous field. The
11144 // parameters are as for add_methods_for_type.
11147 Type::add_interface_methods_for_type(const Type
* type
,
11148 const Method::Field_indexes
* field_indexes
,
11149 unsigned int depth
,
11152 const Interface_type
* it
= type
->interface_type();
11156 const Typed_identifier_list
* imethods
= it
->methods();
11157 if (imethods
== NULL
)
11160 for (Typed_identifier_list::const_iterator pm
= imethods
->begin();
11161 pm
!= imethods
->end();
11164 Function_type
* fntype
= pm
->type()->function_type();
11165 if (fntype
== NULL
)
11167 // This is an error, but it should be reported elsewhere
11168 // when we look at the methods for IT.
11171 go_assert(!fntype
->is_method());
11172 fntype
= fntype
->copy_with_receiver(const_cast<Type
*>(type
));
11173 Method
* m
= new Interface_method(pm
->name(), pm
->location(), fntype
,
11174 field_indexes
, depth
);
11175 if (!methods
->insert(pm
->name(), m
))
11180 // Build stub methods for TYPE as needed. METHODS is the set of
11181 // methods for the type. A stub method may be needed when a type
11182 // inherits a method from an anonymous field. When we need the
11183 // address of the method, as in a type descriptor, we need to build a
11184 // little stub which does the required field dereferences and jumps to
11185 // the real method. LOCATION is the location of the type definition.
11188 Type::build_stub_methods(Gogo
* gogo
, const Type
* type
, const Methods
* methods
,
11191 if (methods
== NULL
)
11193 for (Methods::const_iterator p
= methods
->begin();
11194 p
!= methods
->end();
11197 Method
* m
= p
->second
;
11198 if (m
->is_ambiguous() || !m
->needs_stub_method())
11201 const std::string
& name(p
->first
);
11203 // Build a stub method.
11205 const Function_type
* fntype
= m
->type();
11207 static unsigned int counter
;
11209 snprintf(buf
, sizeof buf
, "$this%u", counter
);
11212 Type
* receiver_type
= const_cast<Type
*>(type
);
11213 if (!m
->is_value_method())
11214 receiver_type
= Type::make_pointer_type(receiver_type
);
11215 Location receiver_location
= m
->receiver_location();
11216 Typed_identifier
* receiver
= new Typed_identifier(buf
, receiver_type
,
11217 receiver_location
);
11219 const Typed_identifier_list
* fnparams
= fntype
->parameters();
11220 Typed_identifier_list
* stub_params
;
11221 if (fnparams
== NULL
|| fnparams
->empty())
11222 stub_params
= NULL
;
11225 // We give each stub parameter a unique name.
11226 stub_params
= new Typed_identifier_list();
11227 for (Typed_identifier_list::const_iterator pp
= fnparams
->begin();
11228 pp
!= fnparams
->end();
11232 snprintf(pbuf
, sizeof pbuf
, "$p%u", counter
);
11233 stub_params
->push_back(Typed_identifier(pbuf
, pp
->type(),
11239 const Typed_identifier_list
* fnresults
= fntype
->results();
11240 Typed_identifier_list
* stub_results
;
11241 if (fnresults
== NULL
|| fnresults
->empty())
11242 stub_results
= NULL
;
11245 // We create the result parameters without any names, since
11246 // we won't refer to them.
11247 stub_results
= new Typed_identifier_list();
11248 for (Typed_identifier_list::const_iterator pr
= fnresults
->begin();
11249 pr
!= fnresults
->end();
11251 stub_results
->push_back(Typed_identifier("", pr
->type(),
11255 Function_type
* stub_type
= Type::make_function_type(receiver
,
11258 fntype
->location());
11259 if (fntype
->is_varargs())
11260 stub_type
->set_is_varargs();
11262 // We only create the function in the package which creates the
11264 const Package
* package
;
11265 if (type
->named_type() == NULL
)
11268 package
= type
->named_type()->named_object()->package();
11269 std::string stub_name
= gogo
->stub_method_name(package
, name
);
11270 Named_object
* stub
;
11271 if (package
!= NULL
)
11272 stub
= Named_object::make_function_declaration(stub_name
, package
,
11273 stub_type
, location
);
11276 stub
= gogo
->start_function(stub_name
, stub_type
, false,
11277 fntype
->location());
11278 Type::build_one_stub_method(gogo
, m
, buf
, stub_params
,
11279 fntype
->is_varargs(), location
);
11280 gogo
->finish_function(fntype
->location());
11282 if (type
->named_type() == NULL
&& stub
->is_function())
11283 stub
->func_value()->set_is_unnamed_type_stub_method();
11284 if (m
->nointerface() && stub
->is_function())
11285 stub
->func_value()->set_nointerface();
11288 m
->set_stub_object(stub
);
11292 // Build a stub method which adjusts the receiver as required to call
11293 // METHOD. RECEIVER_NAME is the name we used for the receiver.
11294 // PARAMS is the list of function parameters.
11297 Type::build_one_stub_method(Gogo
* gogo
, Method
* method
,
11298 const char* receiver_name
,
11299 const Typed_identifier_list
* params
,
11303 Named_object
* receiver_object
= gogo
->lookup(receiver_name
, NULL
);
11304 go_assert(receiver_object
!= NULL
);
11306 Expression
* expr
= Expression::make_var_reference(receiver_object
, location
);
11307 expr
= Type::apply_field_indexes(expr
, method
->field_indexes(), location
);
11308 if (expr
->type()->points_to() == NULL
)
11309 expr
= Expression::make_unary(OPERATOR_AND
, expr
, location
);
11311 Expression_list
* arguments
;
11312 if (params
== NULL
|| params
->empty())
11316 arguments
= new Expression_list();
11317 for (Typed_identifier_list::const_iterator p
= params
->begin();
11318 p
!= params
->end();
11321 Named_object
* param
= gogo
->lookup(p
->name(), NULL
);
11322 go_assert(param
!= NULL
);
11323 Expression
* param_ref
= Expression::make_var_reference(param
,
11325 arguments
->push_back(param_ref
);
11329 Expression
* func
= method
->bind_method(expr
, location
);
11330 go_assert(func
!= NULL
);
11331 Call_expression
* call
= Expression::make_call(func
, arguments
, is_varargs
,
11334 gogo
->add_statement(Statement::make_return_from_call(call
, location
));
11337 // Apply FIELD_INDEXES to EXPR. The field indexes have to be applied
11338 // in reverse order.
11341 Type::apply_field_indexes(Expression
* expr
,
11342 const Method::Field_indexes
* field_indexes
,
11345 if (field_indexes
== NULL
)
11347 expr
= Type::apply_field_indexes(expr
, field_indexes
->next
, location
);
11348 Struct_type
* stype
= expr
->type()->deref()->struct_type();
11349 go_assert(stype
!= NULL
11350 && field_indexes
->field_index
< stype
->field_count());
11351 if (expr
->type()->struct_type() == NULL
)
11353 go_assert(expr
->type()->points_to() != NULL
);
11354 expr
= Expression::make_dereference(expr
, Expression::NIL_CHECK_DEFAULT
,
11356 go_assert(expr
->type()->struct_type() == stype
);
11358 return Expression::make_field_reference(expr
, field_indexes
->field_index
,
11362 // Return whether NO is a method for which the receiver is a pointer.
11365 Type::method_expects_pointer(const Named_object
* no
)
11367 const Function_type
*fntype
;
11368 if (no
->is_function())
11369 fntype
= no
->func_value()->type();
11370 else if (no
->is_function_declaration())
11371 fntype
= no
->func_declaration_value()->type();
11374 return fntype
->receiver()->type()->points_to() != NULL
;
11377 // Given a set of methods for a type, METHODS, return the method NAME,
11378 // or NULL if there isn't one or if it is ambiguous. If IS_AMBIGUOUS
11379 // is not NULL, then set *IS_AMBIGUOUS to true if the method exists
11380 // but is ambiguous (and return NULL).
11383 Type::method_function(const Methods
* methods
, const std::string
& name
,
11384 bool* is_ambiguous
)
11386 if (is_ambiguous
!= NULL
)
11387 *is_ambiguous
= false;
11388 if (methods
== NULL
)
11390 Methods::const_iterator p
= methods
->find(name
);
11391 if (p
== methods
->end())
11393 Method
* m
= p
->second
;
11394 if (m
->is_ambiguous())
11396 if (is_ambiguous
!= NULL
)
11397 *is_ambiguous
= true;
11403 // Return a pointer to the interface method table for TYPE for the
11404 // interface INTERFACE.
11407 Type::interface_method_table(Type
* type
,
11408 Interface_type
*interface
,
11410 Interface_method_tables
** method_tables
,
11411 Interface_method_tables
** pointer_tables
)
11413 go_assert(!interface
->is_empty());
11415 Interface_method_tables
** pimt
= is_pointer
? method_tables
: pointer_tables
;
11418 *pimt
= new Interface_method_tables(5);
11420 std::pair
<Interface_type
*, Expression
*> val(interface
, NULL
);
11421 std::pair
<Interface_method_tables::iterator
, bool> ins
= (*pimt
)->insert(val
);
11423 Location loc
= Linemap::predeclared_location();
11426 // This is a new entry in the hash table.
11427 go_assert(ins
.first
->second
== NULL
);
11428 ins
.first
->second
=
11429 Expression::make_interface_mtable_ref(interface
, type
, is_pointer
, loc
);
11431 return Expression::make_unary(OPERATOR_AND
, ins
.first
->second
, loc
);
11434 // Look for field or method NAME for TYPE. Return an Expression for
11435 // the field or method bound to EXPR. If there is no such field or
11436 // method, give an appropriate error and return an error expression.
11439 Type::bind_field_or_method(Gogo
* gogo
, const Type
* type
, Expression
* expr
,
11440 const std::string
& name
,
11443 if (type
->deref()->is_error_type())
11444 return Expression::make_error(location
);
11446 const Named_type
* nt
= type
->deref()->named_type();
11447 const Struct_type
* st
= type
->deref()->struct_type();
11448 const Interface_type
* it
= type
->interface_type();
11450 // If this is a pointer to a pointer, then it is possible that the
11451 // pointed-to type has methods.
11452 bool dereferenced
= false;
11456 && type
->points_to() != NULL
11457 && type
->points_to()->points_to() != NULL
)
11459 expr
= Expression::make_dereference(expr
, Expression::NIL_CHECK_DEFAULT
,
11461 type
= type
->points_to();
11462 if (type
->deref()->is_error_type())
11463 return Expression::make_error(location
);
11464 nt
= type
->points_to()->named_type();
11465 st
= type
->points_to()->struct_type();
11466 dereferenced
= true;
11469 bool receiver_can_be_pointer
= (expr
->type()->points_to() != NULL
11470 || expr
->is_addressable());
11471 std::vector
<const Named_type
*> seen
;
11472 bool is_method
= false;
11473 bool found_pointer_method
= false;
11474 std::string ambig1
;
11475 std::string ambig2
;
11476 if (Type::find_field_or_method(type
, name
, receiver_can_be_pointer
,
11477 &seen
, NULL
, &is_method
,
11478 &found_pointer_method
, &ambig1
, &ambig2
))
11483 go_assert(st
!= NULL
);
11484 if (type
->struct_type() == NULL
)
11488 go_error_at(location
, "pointer type has no field %qs",
11489 Gogo::message_name(name
).c_str());
11490 return Expression::make_error(location
);
11492 go_assert(type
->points_to() != NULL
);
11493 expr
= Expression::make_dereference(expr
,
11494 Expression::NIL_CHECK_DEFAULT
,
11496 go_assert(expr
->type()->struct_type() == st
);
11498 ret
= st
->field_reference(expr
, name
, location
);
11501 go_error_at(location
, "type has no field %qs",
11502 Gogo::message_name(name
).c_str());
11503 return Expression::make_error(location
);
11506 else if (it
!= NULL
&& it
->find_method(name
) != NULL
)
11507 ret
= Expression::make_interface_field_reference(expr
, name
,
11513 m
= nt
->method_function(name
, NULL
);
11514 else if (st
!= NULL
)
11515 m
= st
->method_function(name
, NULL
);
11518 go_assert(m
!= NULL
);
11521 go_error_at(location
,
11522 "calling method %qs requires explicit dereference",
11523 Gogo::message_name(name
).c_str());
11524 return Expression::make_error(location
);
11526 if (!m
->is_value_method() && expr
->type()->points_to() == NULL
)
11527 expr
= Expression::make_unary(OPERATOR_AND
, expr
, location
);
11528 ret
= m
->bind_method(expr
, location
);
11530 go_assert(ret
!= NULL
);
11535 if (Gogo::is_erroneous_name(name
))
11537 // An error was already reported.
11539 else if (!ambig1
.empty())
11540 go_error_at(location
, "%qs is ambiguous via %qs and %qs",
11541 Gogo::message_name(name
).c_str(), ambig1
.c_str(),
11543 else if (found_pointer_method
)
11544 go_error_at(location
, "method requires a pointer receiver");
11545 else if (nt
== NULL
&& st
== NULL
&& it
== NULL
)
11546 go_error_at(location
,
11547 ("reference to field %qs in object which "
11548 "has no fields or methods"),
11549 Gogo::message_name(name
).c_str());
11552 bool is_unexported
;
11553 // The test for 'a' and 'z' is to handle builtin names,
11554 // which are not hidden.
11555 if (!Gogo::is_hidden_name(name
) && (name
[0] < 'a' || name
[0] > 'z'))
11556 is_unexported
= false;
11559 std::string unpacked
= Gogo::unpack_hidden_name(name
);
11561 is_unexported
= Type::is_unexported_field_or_method(gogo
, type
,
11566 go_error_at(location
, "reference to unexported field or method %qs",
11567 Gogo::message_name(name
).c_str());
11569 go_error_at(location
, "reference to undefined field or method %qs",
11570 Gogo::message_name(name
).c_str());
11572 return Expression::make_error(location
);
11576 // Look in TYPE for a field or method named NAME, return true if one
11577 // is found. This looks through embedded anonymous fields and handles
11578 // ambiguity. If a method is found, sets *IS_METHOD to true;
11579 // otherwise, if a field is found, set it to false. If
11580 // RECEIVER_CAN_BE_POINTER is false, then the receiver is a value
11581 // whose address can not be taken. SEEN is used to avoid infinite
11582 // recursion on invalid types.
11584 // When returning false, this sets *FOUND_POINTER_METHOD if we found a
11585 // method we couldn't use because it requires a pointer. LEVEL is
11586 // used for recursive calls, and can be NULL for a non-recursive call.
11587 // When this function returns false because it finds that the name is
11588 // ambiguous, it will store a path to the ambiguous names in *AMBIG1
11589 // and *AMBIG2. If the name is not found at all, *AMBIG1 and *AMBIG2
11590 // will be unchanged.
11592 // This function just returns whether or not there is a field or
11593 // method, and whether it is a field or method. It doesn't build an
11594 // expression to refer to it. If it is a method, we then look in the
11595 // list of all methods for the type. If it is a field, the search has
11596 // to be done again, looking only for fields, and building up the
11597 // expression as we go.
11600 Type::find_field_or_method(const Type
* type
,
11601 const std::string
& name
,
11602 bool receiver_can_be_pointer
,
11603 std::vector
<const Named_type
*>* seen
,
11606 bool* found_pointer_method
,
11607 std::string
* ambig1
,
11608 std::string
* ambig2
)
11610 // Named types can have locally defined methods.
11611 const Named_type
* nt
= type
->unalias()->named_type();
11612 if (nt
== NULL
&& type
->points_to() != NULL
)
11613 nt
= type
->points_to()->unalias()->named_type();
11616 Named_object
* no
= nt
->find_local_method(name
);
11619 if (receiver_can_be_pointer
|| !Type::method_expects_pointer(no
))
11625 // Record that we have found a pointer method in order to
11626 // give a better error message if we don't find anything
11628 *found_pointer_method
= true;
11631 for (std::vector
<const Named_type
*>::const_iterator p
= seen
->begin();
11637 // We've already seen this type when searching for methods.
11643 // Interface types can have methods.
11644 const Interface_type
* it
= type
->interface_type();
11645 if (it
!= NULL
&& it
->find_method(name
) != NULL
)
11651 // Struct types can have fields. They can also inherit fields and
11652 // methods from anonymous fields.
11653 const Struct_type
* st
= type
->deref()->struct_type();
11656 const Struct_field_list
* fields
= st
->fields();
11657 if (fields
== NULL
)
11661 seen
->push_back(nt
);
11663 int found_level
= 0;
11664 bool found_is_method
= false;
11665 std::string found_ambig1
;
11666 std::string found_ambig2
;
11667 const Struct_field
* found_parent
= NULL
;
11668 for (Struct_field_list::const_iterator pf
= fields
->begin();
11669 pf
!= fields
->end();
11672 if (pf
->is_field_name(name
))
11674 *is_method
= false;
11680 if (!pf
->is_anonymous())
11683 if (pf
->type()->deref()->is_error_type()
11684 || pf
->type()->deref()->is_undefined())
11687 Named_type
* fnt
= pf
->type()->named_type();
11689 fnt
= pf
->type()->deref()->named_type();
11690 go_assert(fnt
!= NULL
);
11692 // Methods with pointer receivers on embedded field are
11693 // inherited by the pointer to struct, and also by the struct
11694 // type if the field itself is a pointer.
11695 bool can_be_pointer
= (receiver_can_be_pointer
11696 || pf
->type()->points_to() != NULL
);
11697 int sublevel
= level
== NULL
? 1 : *level
+ 1;
11698 bool sub_is_method
;
11699 std::string subambig1
;
11700 std::string subambig2
;
11701 bool subfound
= Type::find_field_or_method(fnt
,
11707 found_pointer_method
,
11712 if (!subambig1
.empty())
11714 // The name was found via this field, but is ambiguous.
11715 // if the ambiguity is lower or at the same level as
11716 // anything else we have already found, then we want to
11717 // pass the ambiguity back to the caller.
11718 if (found_level
== 0 || sublevel
<= found_level
)
11720 found_ambig1
= (Gogo::message_name(pf
->field_name())
11721 + '.' + subambig1
);
11722 found_ambig2
= (Gogo::message_name(pf
->field_name())
11723 + '.' + subambig2
);
11724 found_level
= sublevel
;
11730 // The name was found via this field. Use the level to see
11731 // if we want to use this one, or whether it introduces an
11733 if (found_level
== 0 || sublevel
< found_level
)
11735 found_level
= sublevel
;
11736 found_is_method
= sub_is_method
;
11737 found_ambig1
.clear();
11738 found_ambig2
.clear();
11739 found_parent
= &*pf
;
11741 else if (sublevel
> found_level
)
11743 else if (found_ambig1
.empty())
11745 // We found an ambiguity.
11746 go_assert(found_parent
!= NULL
);
11747 found_ambig1
= Gogo::message_name(found_parent
->field_name());
11748 found_ambig2
= Gogo::message_name(pf
->field_name());
11752 // We found an ambiguity, but we already know of one.
11753 // Just report the earlier one.
11758 // Here if we didn't find anything FOUND_LEVEL is 0. If we found
11759 // something ambiguous, FOUND_LEVEL is not 0 and FOUND_AMBIG1 and
11760 // FOUND_AMBIG2 are not empty. If we found the field, FOUND_LEVEL
11761 // is not 0 and FOUND_AMBIG1 and FOUND_AMBIG2 are empty.
11766 if (found_level
== 0)
11768 else if (found_is_method
11769 && type
->named_type() != NULL
11770 && type
->points_to() != NULL
)
11772 // If this is a method inherited from a struct field in a named pointer
11773 // type, it is invalid to automatically dereference the pointer to the
11774 // struct to find this method.
11776 *level
= found_level
;
11780 else if (!found_ambig1
.empty())
11782 go_assert(!found_ambig1
.empty());
11783 ambig1
->assign(found_ambig1
);
11784 ambig2
->assign(found_ambig2
);
11786 *level
= found_level
;
11792 *level
= found_level
;
11793 *is_method
= found_is_method
;
11798 // Return whether NAME is an unexported field or method for TYPE.
11801 Type::is_unexported_field_or_method(Gogo
* gogo
, const Type
* type
,
11802 const std::string
& name
,
11803 std::vector
<const Named_type
*>* seen
)
11805 const Named_type
* nt
= type
->named_type();
11807 nt
= type
->deref()->named_type();
11810 if (nt
->is_unexported_local_method(gogo
, name
))
11813 for (std::vector
<const Named_type
*>::const_iterator p
= seen
->begin();
11819 // We've already seen this type.
11825 const Interface_type
* it
= type
->interface_type();
11826 if (it
!= NULL
&& it
->is_unexported_method(gogo
, name
))
11829 type
= type
->deref();
11831 const Struct_type
* st
= type
->struct_type();
11832 if (st
!= NULL
&& st
->is_unexported_local_field(gogo
, name
))
11838 const Struct_field_list
* fields
= st
->fields();
11839 if (fields
== NULL
)
11843 seen
->push_back(nt
);
11845 for (Struct_field_list::const_iterator pf
= fields
->begin();
11846 pf
!= fields
->end();
11849 if (pf
->is_anonymous()
11850 && !pf
->type()->deref()->is_error_type()
11851 && !pf
->type()->deref()->is_undefined())
11853 Named_type
* subtype
= pf
->type()->named_type();
11854 if (subtype
== NULL
)
11855 subtype
= pf
->type()->deref()->named_type();
11856 if (subtype
== NULL
)
11858 // This is an error, but it will be diagnosed elsewhere.
11861 if (Type::is_unexported_field_or_method(gogo
, subtype
, name
, seen
))
11876 // Class Forward_declaration.
11878 Forward_declaration_type::Forward_declaration_type(Named_object
* named_object
)
11879 : Type(TYPE_FORWARD
),
11880 named_object_(named_object
->resolve()), warned_(false)
11882 go_assert(this->named_object_
->is_unknown()
11883 || this->named_object_
->is_type_declaration());
11886 // Return the named object.
11889 Forward_declaration_type::named_object()
11891 return this->named_object_
->resolve();
11894 const Named_object
*
11895 Forward_declaration_type::named_object() const
11897 return this->named_object_
->resolve();
11900 // Return the name of the forward declared type.
11903 Forward_declaration_type::name() const
11905 return this->named_object()->name();
11908 // Warn about a use of a type which has been declared but not defined.
11911 Forward_declaration_type::warn() const
11913 Named_object
* no
= this->named_object_
->resolve();
11914 if (no
->is_unknown())
11916 // The name was not defined anywhere.
11917 if (!this->warned_
)
11919 go_error_at(this->named_object_
->location(),
11920 "use of undefined type %qs",
11921 no
->message_name().c_str());
11922 this->warned_
= true;
11925 else if (no
->is_type_declaration())
11927 // The name was seen as a type, but the type was never defined.
11928 if (no
->type_declaration_value()->using_type())
11930 go_error_at(this->named_object_
->location(),
11931 "use of undefined type %qs",
11932 no
->message_name().c_str());
11933 this->warned_
= true;
11938 // The name was defined, but not as a type.
11939 if (!this->warned_
)
11941 go_error_at(this->named_object_
->location(), "expected type");
11942 this->warned_
= true;
11947 // Get the base type of a declaration. This gives an error if the
11948 // type has not yet been defined.
11951 Forward_declaration_type::real_type()
11953 if (this->is_defined())
11955 Named_type
* nt
= this->named_object()->type_value();
11956 if (!nt
->is_valid())
11957 return Type::make_error_type();
11958 return this->named_object()->type_value();
11963 return Type::make_error_type();
11968 Forward_declaration_type::real_type() const
11970 if (this->is_defined())
11972 const Named_type
* nt
= this->named_object()->type_value();
11973 if (!nt
->is_valid())
11974 return Type::make_error_type();
11975 return this->named_object()->type_value();
11980 return Type::make_error_type();
11984 // Return whether the base type is defined.
11987 Forward_declaration_type::is_defined() const
11989 return this->named_object()->is_type();
11992 // Add a method. This is used when methods are defined before the
11996 Forward_declaration_type::add_method(const std::string
& name
,
11997 Function
* function
)
11999 Named_object
* no
= this->named_object();
12000 if (no
->is_unknown())
12001 no
->declare_as_type();
12002 return no
->type_declaration_value()->add_method(name
, function
);
12005 // Add a method declaration. This is used when methods are declared
12006 // before the type.
12009 Forward_declaration_type::add_method_declaration(const std::string
& name
,
12011 Function_type
* type
,
12014 Named_object
* no
= this->named_object();
12015 if (no
->is_unknown())
12016 no
->declare_as_type();
12017 Type_declaration
* td
= no
->type_declaration_value();
12018 return td
->add_method_declaration(name
, package
, type
, location
);
12021 // Add an already created object as a method.
12024 Forward_declaration_type::add_existing_method(Named_object
* nom
)
12026 Named_object
* no
= this->named_object();
12027 if (no
->is_unknown())
12028 no
->declare_as_type();
12029 no
->type_declaration_value()->add_existing_method(nom
);
12035 Forward_declaration_type::do_traverse(Traverse
* traverse
)
12037 if (this->is_defined()
12038 && Type::traverse(this->real_type(), traverse
) == TRAVERSE_EXIT
)
12039 return TRAVERSE_EXIT
;
12040 return TRAVERSE_CONTINUE
;
12043 // Verify the type.
12046 Forward_declaration_type::do_verify()
12048 if (!this->is_defined() && !this->is_nil_constant_as_type())
12056 // Get the backend representation for the type.
12059 Forward_declaration_type::do_get_backend(Gogo
* gogo
)
12061 if (this->is_defined())
12062 return Type::get_named_base_btype(gogo
, this->real_type());
12065 return gogo
->backend()->error_type();
12067 // We represent an undefined type as a struct with no fields. That
12068 // should work fine for the backend, since the same case can arise
12070 std::vector
<Backend::Btyped_identifier
> fields
;
12071 Btype
* bt
= gogo
->backend()->struct_type(fields
);
12072 return gogo
->backend()->named_type(this->name(), bt
,
12073 this->named_object()->location());
12076 // Build a type descriptor for a forwarded type.
12079 Forward_declaration_type::do_type_descriptor(Gogo
* gogo
, Named_type
* name
)
12081 Location ploc
= Linemap::predeclared_location();
12082 if (!this->is_defined())
12083 return Expression::make_error(ploc
);
12086 Type
* t
= this->real_type();
12088 return this->named_type_descriptor(gogo
, t
, name
);
12090 return Expression::make_error(this->named_object_
->location());
12094 // The reflection string.
12097 Forward_declaration_type::do_reflection(Gogo
* gogo
, std::string
* ret
) const
12099 this->append_reflection(this->real_type(), gogo
, ret
);
12102 // Export a forward declaration. This can happen when a defined type
12103 // refers to a type which is only declared (and is presumably defined
12104 // in some other file in the same package).
12107 Forward_declaration_type::do_export(Export
*) const
12109 // If there is a base type, that should be exported instead of this.
12110 go_assert(!this->is_defined());
12112 // We don't output anything.
12115 // Make a forward declaration.
12118 Type::make_forward_declaration(Named_object
* named_object
)
12120 return new Forward_declaration_type(named_object
);
12123 // Class Typed_identifier_list.
12125 // Sort the entries by name.
12127 struct Typed_identifier_list_sort
12131 operator()(const Typed_identifier
& t1
, const Typed_identifier
& t2
) const
12133 return (Gogo::unpack_hidden_name(t1
.name())
12134 < Gogo::unpack_hidden_name(t2
.name()));
12139 Typed_identifier_list::sort_by_name()
12141 std::sort(this->entries_
.begin(), this->entries_
.end(),
12142 Typed_identifier_list_sort());
12148 Typed_identifier_list::traverse(Traverse
* traverse
)
12150 for (Typed_identifier_list::const_iterator p
= this->begin();
12154 if (Type::traverse(p
->type(), traverse
) == TRAVERSE_EXIT
)
12155 return TRAVERSE_EXIT
;
12157 return TRAVERSE_CONTINUE
;
12162 Typed_identifier_list
*
12163 Typed_identifier_list::copy() const
12165 Typed_identifier_list
* ret
= new Typed_identifier_list();
12166 for (Typed_identifier_list::const_iterator p
= this->begin();
12169 ret
->push_back(Typed_identifier(p
->name(), p
->type(), p
->location()));