1 /* Breadth-first and depth-first routines for
2 searching multiple-inheritance lattice for GNU C++.
3 Copyright (C) 1987, 1989, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
4 1999, 2000, 2002, 2003, 2004, 2005 Free Software Foundation, Inc.
5 Contributed by Michael Tiemann (tiemann@cygnus.com)
7 This file is part of GCC.
9 GCC is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 2, or (at your option)
14 GCC is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
19 You should have received a copy of the GNU General Public License
20 along with GCC; see the file COPYING. If not, write to
21 the Free Software Foundation, 51 Franklin Street, Fifth Floor,
22 Boston, MA 02110-1301, USA. */
24 /* High-level class interface. */
28 #include "coretypes.h"
38 static int is_subobject_of_p (tree
, tree
);
39 static tree
dfs_lookup_base (tree
, void *);
40 static tree
dfs_dcast_hint_pre (tree
, void *);
41 static tree
dfs_dcast_hint_post (tree
, void *);
42 static tree
dfs_debug_mark (tree
, void *);
43 static tree
dfs_walk_once_r (tree
, tree (*pre_fn
) (tree
, void *),
44 tree (*post_fn
) (tree
, void *), void *data
);
45 static void dfs_unmark_r (tree
);
46 static int check_hidden_convs (tree
, int, int, tree
, tree
, tree
);
47 static tree
split_conversions (tree
, tree
, tree
, tree
);
48 static int lookup_conversions_r (tree
, int, int,
49 tree
, tree
, tree
, tree
, tree
*, tree
*);
50 static int look_for_overrides_r (tree
, tree
);
51 static tree
lookup_field_r (tree
, void *);
52 static tree
dfs_accessible_post (tree
, void *);
53 static tree
dfs_walk_once_accessible_r (tree
, bool, bool,
54 tree (*pre_fn
) (tree
, void *),
55 tree (*post_fn
) (tree
, void *),
57 static tree
dfs_walk_once_accessible (tree
, bool,
58 tree (*pre_fn
) (tree
, void *),
59 tree (*post_fn
) (tree
, void *),
61 static tree
dfs_access_in_type (tree
, void *);
62 static access_kind
access_in_type (tree
, tree
);
63 static int protected_accessible_p (tree
, tree
, tree
);
64 static int friend_accessible_p (tree
, tree
, tree
);
65 static int template_self_reference_p (tree
, tree
);
66 static tree
dfs_get_pure_virtuals (tree
, void *);
69 /* Variables for gathering statistics. */
70 #ifdef GATHER_STATISTICS
71 static int n_fields_searched
;
72 static int n_calls_lookup_field
, n_calls_lookup_field_1
;
73 static int n_calls_lookup_fnfields
, n_calls_lookup_fnfields_1
;
74 static int n_calls_get_base_type
;
75 static int n_outer_fields_searched
;
76 static int n_contexts_saved
;
77 #endif /* GATHER_STATISTICS */
80 /* Data for lookup_base and its workers. */
82 struct lookup_base_data_s
84 tree t
; /* type being searched. */
85 tree base
; /* The base type we're looking for. */
86 tree binfo
; /* Found binfo. */
87 bool via_virtual
; /* Found via a virtual path. */
88 bool ambiguous
; /* Found multiply ambiguous */
89 bool repeated_base
; /* Whether there are repeated bases in the
91 bool want_any
; /* Whether we want any matching binfo. */
94 /* Worker function for lookup_base. See if we've found the desired
95 base and update DATA_ (a pointer to LOOKUP_BASE_DATA_S). */
98 dfs_lookup_base (tree binfo
, void *data_
)
100 struct lookup_base_data_s
*data
= (struct lookup_base_data_s
*) data_
;
102 if (SAME_BINFO_TYPE_P (BINFO_TYPE (binfo
), data
->base
))
108 = binfo_via_virtual (data
->binfo
, data
->t
) != NULL_TREE
;
110 if (!data
->repeated_base
)
111 /* If there are no repeated bases, we can stop now. */
114 if (data
->want_any
&& !data
->via_virtual
)
115 /* If this is a non-virtual base, then we can't do
119 return dfs_skip_bases
;
123 gcc_assert (binfo
!= data
->binfo
);
125 /* We've found more than one matching binfo. */
128 /* This is immediately ambiguous. */
129 data
->binfo
= NULL_TREE
;
130 data
->ambiguous
= true;
131 return error_mark_node
;
134 /* Prefer one via a non-virtual path. */
135 if (!binfo_via_virtual (binfo
, data
->t
))
138 data
->via_virtual
= false;
142 /* There must be repeated bases, otherwise we'd have stopped
143 on the first base we found. */
144 return dfs_skip_bases
;
151 /* Returns true if type BASE is accessible in T. (BASE is known to be
152 a (possibly non-proper) base class of T.) If CONSIDER_LOCAL_P is
153 true, consider any special access of the current scope, or access
154 bestowed by friendship. */
157 accessible_base_p (tree t
, tree base
, bool consider_local_p
)
161 /* [class.access.base]
163 A base class is said to be accessible if an invented public
164 member of the base class is accessible.
166 If BASE is a non-proper base, this condition is trivially
168 if (same_type_p (t
, base
))
170 /* Rather than inventing a public member, we use the implicit
171 public typedef created in the scope of every class. */
172 decl
= TYPE_FIELDS (base
);
173 while (!DECL_SELF_REFERENCE_P (decl
))
174 decl
= TREE_CHAIN (decl
);
175 while (ANON_AGGR_TYPE_P (t
))
176 t
= TYPE_CONTEXT (t
);
177 return accessible_p (t
, decl
, consider_local_p
);
180 /* Lookup BASE in the hierarchy dominated by T. Do access checking as
181 ACCESS specifies. Return the binfo we discover. If KIND_PTR is
182 non-NULL, fill with information about what kind of base we
185 If the base is inaccessible, or ambiguous, and the ba_quiet bit is
186 not set in ACCESS, then an error is issued and error_mark_node is
187 returned. If the ba_quiet bit is set, then no error is issued and
188 NULL_TREE is returned. */
191 lookup_base (tree t
, tree base
, base_access access
, base_kind
*kind_ptr
)
197 if (t
== error_mark_node
|| base
== error_mark_node
)
200 *kind_ptr
= bk_not_base
;
201 return error_mark_node
;
203 gcc_assert (TYPE_P (base
));
212 t
= complete_type (TYPE_MAIN_VARIANT (t
));
213 t_binfo
= TYPE_BINFO (t
);
216 base
= complete_type (TYPE_MAIN_VARIANT (base
));
220 struct lookup_base_data_s data
;
224 data
.binfo
= NULL_TREE
;
225 data
.ambiguous
= data
.via_virtual
= false;
226 data
.repeated_base
= CLASSTYPE_REPEATED_BASE_P (t
);
227 data
.want_any
= access
== ba_any
;
229 dfs_walk_once (t_binfo
, dfs_lookup_base
, NULL
, &data
);
233 bk
= data
.ambiguous
? bk_ambig
: bk_not_base
;
234 else if (binfo
== t_binfo
)
236 else if (data
.via_virtual
)
247 /* Check that the base is unambiguous and accessible. */
248 if (access
!= ba_any
)
255 if (!(access
& ba_quiet
))
257 error ("%qT is an ambiguous base of %qT", base
, t
);
258 binfo
= error_mark_node
;
263 if ((access
& ba_check_bit
)
264 /* If BASE is incomplete, then BASE and TYPE are probably
265 the same, in which case BASE is accessible. If they
266 are not the same, then TYPE is invalid. In that case,
267 there's no need to issue another error here, and
268 there's no implicit typedef to use in the code that
269 follows, so we skip the check. */
270 && COMPLETE_TYPE_P (base
)
271 && !accessible_base_p (t
, base
, !(access
& ba_ignore_scope
)))
273 if (!(access
& ba_quiet
))
275 error ("%qT is an inaccessible base of %qT", base
, t
);
276 binfo
= error_mark_node
;
280 bk
= bk_inaccessible
;
291 /* Data for dcast_base_hint walker. */
295 tree subtype
; /* The base type we're looking for. */
296 int virt_depth
; /* Number of virtual bases encountered from most
298 tree offset
; /* Best hint offset discovered so far. */
299 bool repeated_base
; /* Whether there are repeated bases in the
303 /* Worker for dcast_base_hint. Search for the base type being cast
307 dfs_dcast_hint_pre (tree binfo
, void *data_
)
309 struct dcast_data_s
*data
= (struct dcast_data_s
*) data_
;
311 if (BINFO_VIRTUAL_P (binfo
))
314 if (SAME_BINFO_TYPE_P (BINFO_TYPE (binfo
), data
->subtype
))
316 if (data
->virt_depth
)
318 data
->offset
= ssize_int (-1);
322 data
->offset
= ssize_int (-3);
324 data
->offset
= BINFO_OFFSET (binfo
);
326 return data
->repeated_base
? dfs_skip_bases
: data
->offset
;
332 /* Worker for dcast_base_hint. Track the virtual depth. */
335 dfs_dcast_hint_post (tree binfo
, void *data_
)
337 struct dcast_data_s
*data
= (struct dcast_data_s
*) data_
;
339 if (BINFO_VIRTUAL_P (binfo
))
345 /* The dynamic cast runtime needs a hint about how the static SUBTYPE type
346 started from is related to the required TARGET type, in order to optimize
347 the inheritance graph search. This information is independent of the
348 current context, and ignores private paths, hence get_base_distance is
349 inappropriate. Return a TREE specifying the base offset, BOFF.
350 BOFF >= 0, there is only one public non-virtual SUBTYPE base at offset BOFF,
351 and there are no public virtual SUBTYPE bases.
352 BOFF == -1, SUBTYPE occurs as multiple public virtual or non-virtual bases.
353 BOFF == -2, SUBTYPE is not a public base.
354 BOFF == -3, SUBTYPE occurs as multiple public non-virtual bases. */
357 dcast_base_hint (tree subtype
, tree target
)
359 struct dcast_data_s data
;
361 data
.subtype
= subtype
;
363 data
.offset
= NULL_TREE
;
364 data
.repeated_base
= CLASSTYPE_REPEATED_BASE_P (target
);
366 dfs_walk_once_accessible (TYPE_BINFO (target
), /*friends=*/false,
367 dfs_dcast_hint_pre
, dfs_dcast_hint_post
, &data
);
368 return data
.offset
? data
.offset
: ssize_int (-2);
371 /* Search for a member with name NAME in a multiple inheritance
372 lattice specified by TYPE. If it does not exist, return NULL_TREE.
373 If the member is ambiguously referenced, return `error_mark_node'.
374 Otherwise, return a DECL with the indicated name. If WANT_TYPE is
375 true, type declarations are preferred. */
377 /* Do a 1-level search for NAME as a member of TYPE. The caller must
378 figure out whether it can access this field. (Since it is only one
379 level, this is reasonable.) */
382 lookup_field_1 (tree type
, tree name
, bool want_type
)
386 if (TREE_CODE (type
) == TEMPLATE_TYPE_PARM
387 || TREE_CODE (type
) == BOUND_TEMPLATE_TEMPLATE_PARM
388 || TREE_CODE (type
) == TYPENAME_TYPE
)
389 /* The TYPE_FIELDS of a TEMPLATE_TYPE_PARM and
390 BOUND_TEMPLATE_TEMPLATE_PARM are not fields at all;
391 instead TYPE_FIELDS is the TEMPLATE_PARM_INDEX. (Miraculously,
392 the code often worked even when we treated the index as a list
394 The TYPE_FIELDS of TYPENAME_TYPE is its TYPENAME_TYPE_FULLNAME. */
398 && DECL_LANG_SPECIFIC (TYPE_NAME (type
))
399 && DECL_SORTED_FIELDS (TYPE_NAME (type
)))
401 tree
*fields
= &DECL_SORTED_FIELDS (TYPE_NAME (type
))->elts
[0];
402 int lo
= 0, hi
= DECL_SORTED_FIELDS (TYPE_NAME (type
))->len
;
409 #ifdef GATHER_STATISTICS
411 #endif /* GATHER_STATISTICS */
413 if (DECL_NAME (fields
[i
]) > name
)
415 else if (DECL_NAME (fields
[i
]) < name
)
421 /* We might have a nested class and a field with the
422 same name; we sorted them appropriately via
423 field_decl_cmp, so just look for the first or last
424 field with this name. */
429 while (i
>= lo
&& DECL_NAME (fields
[i
]) == name
);
430 if (TREE_CODE (field
) != TYPE_DECL
431 && !DECL_CLASS_TEMPLATE_P (field
))
438 while (i
< hi
&& DECL_NAME (fields
[i
]) == name
);
446 field
= TYPE_FIELDS (type
);
448 #ifdef GATHER_STATISTICS
449 n_calls_lookup_field_1
++;
450 #endif /* GATHER_STATISTICS */
451 for (field
= TYPE_FIELDS (type
); field
; field
= TREE_CHAIN (field
))
453 #ifdef GATHER_STATISTICS
455 #endif /* GATHER_STATISTICS */
456 gcc_assert (DECL_P (field
));
457 if (DECL_NAME (field
) == NULL_TREE
458 && ANON_AGGR_TYPE_P (TREE_TYPE (field
)))
460 tree temp
= lookup_field_1 (TREE_TYPE (field
), name
, want_type
);
464 if (TREE_CODE (field
) == USING_DECL
)
466 /* We generally treat class-scope using-declarations as
467 ARM-style access specifications, because support for the
468 ISO semantics has not been implemented. So, in general,
469 there's no reason to return a USING_DECL, and the rest of
470 the compiler cannot handle that. Once the class is
471 defined, USING_DECLs are purged from TYPE_FIELDS; see
472 handle_using_decl. However, we make special efforts to
473 make using-declarations in class templates and class
474 template partial specializations work correctly. */
475 if (!DECL_DEPENDENT_P (field
))
479 if (DECL_NAME (field
) == name
481 || TREE_CODE (field
) == TYPE_DECL
482 || DECL_CLASS_TEMPLATE_P (field
)))
486 if (name
== vptr_identifier
)
488 /* Give the user what s/he thinks s/he wants. */
489 if (TYPE_POLYMORPHIC_P (type
))
490 return TYPE_VFIELD (type
);
495 /* Return the FUNCTION_DECL, RECORD_TYPE, UNION_TYPE, or
496 NAMESPACE_DECL corresponding to the innermost non-block scope. */
501 /* There are a number of cases we need to be aware of here:
502 current_class_type current_function_decl
509 Those last two make life interesting. If we're in a function which is
510 itself inside a class, we need decls to go into the fn's decls (our
511 second case below). But if we're in a class and the class itself is
512 inside a function, we need decls to go into the decls for the class. To
513 achieve this last goal, we must see if, when both current_class_ptr and
514 current_function_decl are set, the class was declared inside that
515 function. If so, we know to put the decls into the class's scope. */
516 if (current_function_decl
&& current_class_type
517 && ((DECL_FUNCTION_MEMBER_P (current_function_decl
)
518 && same_type_p (DECL_CONTEXT (current_function_decl
),
520 || (DECL_FRIEND_CONTEXT (current_function_decl
)
521 && same_type_p (DECL_FRIEND_CONTEXT (current_function_decl
),
522 current_class_type
))))
523 return current_function_decl
;
524 if (current_class_type
)
525 return current_class_type
;
526 if (current_function_decl
)
527 return current_function_decl
;
528 return current_namespace
;
531 /* Returns nonzero if we are currently in a function scope. Note
532 that this function returns zero if we are within a local class, but
533 not within a member function body of the local class. */
536 at_function_scope_p (void)
538 tree cs
= current_scope ();
539 return cs
&& TREE_CODE (cs
) == FUNCTION_DECL
;
542 /* Returns true if the innermost active scope is a class scope. */
545 at_class_scope_p (void)
547 tree cs
= current_scope ();
548 return cs
&& TYPE_P (cs
);
551 /* Returns true if the innermost active scope is a namespace scope. */
554 at_namespace_scope_p (void)
556 tree cs
= current_scope ();
557 return cs
&& TREE_CODE (cs
) == NAMESPACE_DECL
;
560 /* Return the scope of DECL, as appropriate when doing name-lookup. */
563 context_for_name_lookup (tree decl
)
567 For the purposes of name lookup, after the anonymous union
568 definition, the members of the anonymous union are considered to
569 have been defined in the scope in which the anonymous union is
571 tree context
= DECL_CONTEXT (decl
);
573 while (context
&& TYPE_P (context
) && ANON_AGGR_TYPE_P (context
))
574 context
= TYPE_CONTEXT (context
);
576 context
= global_namespace
;
581 /* The accessibility routines use BINFO_ACCESS for scratch space
582 during the computation of the accessibility of some declaration. */
584 #define BINFO_ACCESS(NODE) \
585 ((access_kind) ((TREE_PUBLIC (NODE) << 1) | TREE_PRIVATE (NODE)))
587 /* Set the access associated with NODE to ACCESS. */
589 #define SET_BINFO_ACCESS(NODE, ACCESS) \
590 ((TREE_PUBLIC (NODE) = ((ACCESS) & 2) != 0), \
591 (TREE_PRIVATE (NODE) = ((ACCESS) & 1) != 0))
593 /* Called from access_in_type via dfs_walk. Calculate the access to
594 DATA (which is really a DECL) in BINFO. */
597 dfs_access_in_type (tree binfo
, void *data
)
599 tree decl
= (tree
) data
;
600 tree type
= BINFO_TYPE (binfo
);
601 access_kind access
= ak_none
;
603 if (context_for_name_lookup (decl
) == type
)
605 /* If we have descended to the scope of DECL, just note the
606 appropriate access. */
607 if (TREE_PRIVATE (decl
))
609 else if (TREE_PROTECTED (decl
))
610 access
= ak_protected
;
616 /* First, check for an access-declaration that gives us more
617 access to the DECL. The CONST_DECL for an enumeration
618 constant will not have DECL_LANG_SPECIFIC, and thus no
620 if (DECL_LANG_SPECIFIC (decl
) && !DECL_DISCRIMINATOR_P (decl
))
622 tree decl_access
= purpose_member (type
, DECL_ACCESS (decl
));
626 decl_access
= TREE_VALUE (decl_access
);
628 if (decl_access
== access_public_node
)
630 else if (decl_access
== access_protected_node
)
631 access
= ak_protected
;
632 else if (decl_access
== access_private_node
)
643 VEC(tree
,gc
) *accesses
;
645 /* Otherwise, scan our baseclasses, and pick the most favorable
647 accesses
= BINFO_BASE_ACCESSES (binfo
);
648 for (i
= 0; BINFO_BASE_ITERATE (binfo
, i
, base_binfo
); i
++)
650 tree base_access
= VEC_index (tree
, accesses
, i
);
651 access_kind base_access_now
= BINFO_ACCESS (base_binfo
);
653 if (base_access_now
== ak_none
|| base_access_now
== ak_private
)
654 /* If it was not accessible in the base, or only
655 accessible as a private member, we can't access it
657 base_access_now
= ak_none
;
658 else if (base_access
== access_protected_node
)
659 /* Public and protected members in the base become
661 base_access_now
= ak_protected
;
662 else if (base_access
== access_private_node
)
663 /* Public and protected members in the base become
665 base_access_now
= ak_private
;
667 /* See if the new access, via this base, gives more
668 access than our previous best access. */
669 if (base_access_now
!= ak_none
670 && (access
== ak_none
|| base_access_now
< access
))
672 access
= base_access_now
;
674 /* If the new access is public, we can't do better. */
675 if (access
== ak_public
)
682 /* Note the access to DECL in TYPE. */
683 SET_BINFO_ACCESS (binfo
, access
);
688 /* Return the access to DECL in TYPE. */
691 access_in_type (tree type
, tree decl
)
693 tree binfo
= TYPE_BINFO (type
);
695 /* We must take into account
699 If a name can be reached by several paths through a multiple
700 inheritance graph, the access is that of the path that gives
703 The algorithm we use is to make a post-order depth-first traversal
704 of the base-class hierarchy. As we come up the tree, we annotate
705 each node with the most lenient access. */
706 dfs_walk_once (binfo
, NULL
, dfs_access_in_type
, decl
);
708 return BINFO_ACCESS (binfo
);
711 /* Returns nonzero if it is OK to access DECL through an object
712 indicated by BINFO in the context of DERIVED. */
715 protected_accessible_p (tree decl
, tree derived
, tree binfo
)
719 /* We're checking this clause from [class.access.base]
721 m as a member of N is protected, and the reference occurs in a
722 member or friend of class N, or in a member or friend of a
723 class P derived from N, where m as a member of P is private or
726 Here DERIVED is a possible P and DECL is m. accessible_p will
727 iterate over various values of N, but the access to m in DERIVED
730 Note that I believe that the passage above is wrong, and should read
731 "...is private or protected or public"; otherwise you get bizarre results
732 whereby a public using-decl can prevent you from accessing a protected
733 member of a base. (jason 2000/02/28) */
735 /* If DERIVED isn't derived from m's class, then it can't be a P. */
736 if (!DERIVED_FROM_P (context_for_name_lookup (decl
), derived
))
739 access
= access_in_type (derived
, decl
);
741 /* If m is inaccessible in DERIVED, then it's not a P. */
742 if (access
== ak_none
)
747 When a friend or a member function of a derived class references
748 a protected nonstatic member of a base class, an access check
749 applies in addition to those described earlier in clause
750 _class.access_) Except when forming a pointer to member
751 (_expr.unary.op_), the access must be through a pointer to,
752 reference to, or object of the derived class itself (or any class
753 derived from that class) (_expr.ref_). If the access is to form
754 a pointer to member, the nested-name-specifier shall name the
755 derived class (or any class derived from that class). */
756 if (DECL_NONSTATIC_MEMBER_P (decl
))
758 /* We can tell through what the reference is occurring by
759 chasing BINFO up to the root. */
761 while (BINFO_INHERITANCE_CHAIN (t
))
762 t
= BINFO_INHERITANCE_CHAIN (t
);
764 if (!DERIVED_FROM_P (derived
, BINFO_TYPE (t
)))
771 /* Returns nonzero if SCOPE is a friend of a type which would be able
772 to access DECL through the object indicated by BINFO. */
775 friend_accessible_p (tree scope
, tree decl
, tree binfo
)
777 tree befriending_classes
;
783 if (TREE_CODE (scope
) == FUNCTION_DECL
784 || DECL_FUNCTION_TEMPLATE_P (scope
))
785 befriending_classes
= DECL_BEFRIENDING_CLASSES (scope
);
786 else if (TYPE_P (scope
))
787 befriending_classes
= CLASSTYPE_BEFRIENDING_CLASSES (scope
);
791 for (t
= befriending_classes
; t
; t
= TREE_CHAIN (t
))
792 if (protected_accessible_p (decl
, TREE_VALUE (t
), binfo
))
795 /* Nested classes have the same access as their enclosing types, as
796 per DR 45 (this is a change from the standard). */
798 for (t
= TYPE_CONTEXT (scope
); t
&& TYPE_P (t
); t
= TYPE_CONTEXT (t
))
799 if (protected_accessible_p (decl
, t
, binfo
))
802 if (TREE_CODE (scope
) == FUNCTION_DECL
803 || DECL_FUNCTION_TEMPLATE_P (scope
))
805 /* Perhaps this SCOPE is a member of a class which is a
807 if (DECL_CLASS_SCOPE_P (scope
)
808 && friend_accessible_p (DECL_CONTEXT (scope
), decl
, binfo
))
811 /* Or an instantiation of something which is a friend. */
812 if (DECL_TEMPLATE_INFO (scope
))
815 /* Increment processing_template_decl to make sure that
816 dependent_type_p works correctly. */
817 ++processing_template_decl
;
818 ret
= friend_accessible_p (DECL_TI_TEMPLATE (scope
), decl
, binfo
);
819 --processing_template_decl
;
827 /* Called via dfs_walk_once_accessible from accessible_p */
830 dfs_accessible_post (tree binfo
, void *data ATTRIBUTE_UNUSED
)
832 if (BINFO_ACCESS (binfo
) != ak_none
)
834 tree scope
= current_scope ();
835 if (scope
&& TREE_CODE (scope
) != NAMESPACE_DECL
836 && is_friend (BINFO_TYPE (binfo
), scope
))
843 /* DECL is a declaration from a base class of TYPE, which was the
844 class used to name DECL. Return nonzero if, in the current
845 context, DECL is accessible. If TYPE is actually a BINFO node,
846 then we can tell in what context the access is occurring by looking
847 at the most derived class along the path indicated by BINFO. If
848 CONSIDER_LOCAL is true, do consider special access the current
849 scope or friendship thereof we might have. */
852 accessible_p (tree type
, tree decl
, bool consider_local_p
)
858 /* Nonzero if it's OK to access DECL if it has protected
859 accessibility in TYPE. */
860 int protected_ok
= 0;
862 /* If this declaration is in a block or namespace scope, there's no
864 if (!TYPE_P (context_for_name_lookup (decl
)))
867 /* There is no need to perform access checks inside a thunk. */
868 scope
= current_scope ();
869 if (scope
&& DECL_THUNK_P (scope
))
872 /* In a template declaration, we cannot be sure whether the
873 particular specialization that is instantiated will be a friend
874 or not. Therefore, all access checks are deferred until
875 instantiation. However, PROCESSING_TEMPLATE_DECL is set in the
876 parameter list for a template (because we may see dependent types
877 in default arguments for template parameters), and access
878 checking should be performed in the outermost parameter list. */
879 if (processing_template_decl
880 && (!processing_template_parmlist
|| processing_template_decl
> 1))
886 type
= BINFO_TYPE (type
);
889 binfo
= TYPE_BINFO (type
);
891 /* [class.access.base]
893 A member m is accessible when named in class N if
895 --m as a member of N is public, or
897 --m as a member of N is private, and the reference occurs in a
898 member or friend of class N, or
900 --m as a member of N is protected, and the reference occurs in a
901 member or friend of class N, or in a member or friend of a
902 class P derived from N, where m as a member of P is private or
905 --there exists a base class B of N that is accessible at the point
906 of reference, and m is accessible when named in class B.
908 We walk the base class hierarchy, checking these conditions. */
910 if (consider_local_p
)
912 /* Figure out where the reference is occurring. Check to see if
913 DECL is private or protected in this scope, since that will
914 determine whether protected access is allowed. */
915 if (current_class_type
)
916 protected_ok
= protected_accessible_p (decl
,
917 current_class_type
, binfo
);
919 /* Now, loop through the classes of which we are a friend. */
921 protected_ok
= friend_accessible_p (scope
, decl
, binfo
);
924 /* Standardize the binfo that access_in_type will use. We don't
925 need to know what path was chosen from this point onwards. */
926 binfo
= TYPE_BINFO (type
);
928 /* Compute the accessibility of DECL in the class hierarchy
929 dominated by type. */
930 access
= access_in_type (type
, decl
);
931 if (access
== ak_public
932 || (access
== ak_protected
&& protected_ok
))
935 if (!consider_local_p
)
938 /* Walk the hierarchy again, looking for a base class that allows
940 return dfs_walk_once_accessible (binfo
, /*friends=*/true,
941 NULL
, dfs_accessible_post
, NULL
)
945 struct lookup_field_info
{
946 /* The type in which we're looking. */
948 /* The name of the field for which we're looking. */
950 /* If non-NULL, the current result of the lookup. */
952 /* The path to RVAL. */
954 /* If non-NULL, the lookup was ambiguous, and this is a list of the
957 /* If nonzero, we are looking for types, not data members. */
959 /* If something went wrong, a message indicating what. */
963 /* Within the scope of a template class, you can refer to the to the
964 current specialization with the name of the template itself. For
967 template <typename T> struct S { S* sp; }
969 Returns nonzero if DECL is such a declaration in a class TYPE. */
972 template_self_reference_p (tree type
, tree decl
)
974 return (CLASSTYPE_USE_TEMPLATE (type
)
975 && PRIMARY_TEMPLATE_P (CLASSTYPE_TI_TEMPLATE (type
))
976 && TREE_CODE (decl
) == TYPE_DECL
977 && DECL_ARTIFICIAL (decl
)
978 && DECL_NAME (decl
) == constructor_name (type
));
981 /* Nonzero for a class member means that it is shared between all objects
984 [class.member.lookup]:If the resulting set of declarations are not all
985 from sub-objects of the same type, or the set has a nonstatic member
986 and includes members from distinct sub-objects, there is an ambiguity
987 and the program is ill-formed.
989 This function checks that T contains no nonstatic members. */
992 shared_member_p (tree t
)
994 if (TREE_CODE (t
) == VAR_DECL
|| TREE_CODE (t
) == TYPE_DECL \
995 || TREE_CODE (t
) == CONST_DECL
)
997 if (is_overloaded_fn (t
))
999 for (; t
; t
= OVL_NEXT (t
))
1001 tree fn
= OVL_CURRENT (t
);
1002 if (DECL_NONSTATIC_MEMBER_FUNCTION_P (fn
))
1010 /* Routine to see if the sub-object denoted by the binfo PARENT can be
1011 found as a base class and sub-object of the object denoted by
1015 is_subobject_of_p (tree parent
, tree binfo
)
1019 for (probe
= parent
; probe
; probe
= BINFO_INHERITANCE_CHAIN (probe
))
1023 if (BINFO_VIRTUAL_P (probe
))
1024 return (binfo_for_vbase (BINFO_TYPE (probe
), BINFO_TYPE (binfo
))
1030 /* DATA is really a struct lookup_field_info. Look for a field with
1031 the name indicated there in BINFO. If this function returns a
1032 non-NULL value it is the result of the lookup. Called from
1033 lookup_field via breadth_first_search. */
1036 lookup_field_r (tree binfo
, void *data
)
1038 struct lookup_field_info
*lfi
= (struct lookup_field_info
*) data
;
1039 tree type
= BINFO_TYPE (binfo
);
1040 tree nval
= NULL_TREE
;
1042 /* If this is a dependent base, don't look in it. */
1043 if (BINFO_DEPENDENT_BASE_P (binfo
))
1046 /* If this base class is hidden by the best-known value so far, we
1047 don't need to look. */
1048 if (lfi
->rval_binfo
&& BINFO_INHERITANCE_CHAIN (binfo
) == lfi
->rval_binfo
1049 && !BINFO_VIRTUAL_P (binfo
))
1050 return dfs_skip_bases
;
1052 /* First, look for a function. There can't be a function and a data
1053 member with the same name, and if there's a function and a type
1054 with the same name, the type is hidden by the function. */
1055 if (!lfi
->want_type
)
1057 int idx
= lookup_fnfields_1 (type
, lfi
->name
);
1059 nval
= VEC_index (tree
, CLASSTYPE_METHOD_VEC (type
), idx
);
1063 /* Look for a data member or type. */
1064 nval
= lookup_field_1 (type
, lfi
->name
, lfi
->want_type
);
1066 /* If there is no declaration with the indicated name in this type,
1067 then there's nothing to do. */
1071 /* If we're looking up a type (as with an elaborated type specifier)
1072 we ignore all non-types we find. */
1073 if (lfi
->want_type
&& TREE_CODE (nval
) != TYPE_DECL
1074 && !DECL_CLASS_TEMPLATE_P (nval
))
1076 if (lfi
->name
== TYPE_IDENTIFIER (type
))
1078 /* If the aggregate has no user defined constructors, we allow
1079 it to have fields with the same name as the enclosing type.
1080 If we are looking for that name, find the corresponding
1082 for (nval
= TREE_CHAIN (nval
); nval
; nval
= TREE_CHAIN (nval
))
1083 if (DECL_NAME (nval
) == lfi
->name
1084 && TREE_CODE (nval
) == TYPE_DECL
)
1089 if (!nval
&& CLASSTYPE_NESTED_UTDS (type
) != NULL
)
1091 binding_entry e
= binding_table_find (CLASSTYPE_NESTED_UTDS (type
),
1094 nval
= TYPE_MAIN_DECL (e
->type
);
1100 /* You must name a template base class with a template-id. */
1101 if (!same_type_p (type
, lfi
->type
)
1102 && template_self_reference_p (type
, nval
))
1105 /* If the lookup already found a match, and the new value doesn't
1106 hide the old one, we might have an ambiguity. */
1108 && !is_subobject_of_p (lfi
->rval_binfo
, binfo
))
1111 if (nval
== lfi
->rval
&& shared_member_p (nval
))
1112 /* The two things are really the same. */
1114 else if (is_subobject_of_p (binfo
, lfi
->rval_binfo
))
1115 /* The previous value hides the new one. */
1119 /* We have a real ambiguity. We keep a chain of all the
1121 if (!lfi
->ambiguous
&& lfi
->rval
)
1123 /* This is the first time we noticed an ambiguity. Add
1124 what we previously thought was a reasonable candidate
1126 lfi
->ambiguous
= tree_cons (NULL_TREE
, lfi
->rval
, NULL_TREE
);
1127 TREE_TYPE (lfi
->ambiguous
) = error_mark_node
;
1130 /* Add the new value. */
1131 lfi
->ambiguous
= tree_cons (NULL_TREE
, nval
, lfi
->ambiguous
);
1132 TREE_TYPE (lfi
->ambiguous
) = error_mark_node
;
1133 lfi
->errstr
= "request for member %qD is ambiguous";
1139 lfi
->rval_binfo
= binfo
;
1143 /* Don't look for constructors or destructors in base classes. */
1144 if (IDENTIFIER_CTOR_OR_DTOR_P (lfi
->name
))
1145 return dfs_skip_bases
;
1149 /* Return a "baselink" with BASELINK_BINFO, BASELINK_ACCESS_BINFO,
1150 BASELINK_FUNCTIONS, and BASELINK_OPTYPE set to BINFO, ACCESS_BINFO,
1151 FUNCTIONS, and OPTYPE respectively. */
1154 build_baselink (tree binfo
, tree access_binfo
, tree functions
, tree optype
)
1158 gcc_assert (TREE_CODE (functions
) == FUNCTION_DECL
1159 || TREE_CODE (functions
) == TEMPLATE_DECL
1160 || TREE_CODE (functions
) == TEMPLATE_ID_EXPR
1161 || TREE_CODE (functions
) == OVERLOAD
);
1162 gcc_assert (!optype
|| TYPE_P (optype
));
1163 gcc_assert (TREE_TYPE (functions
));
1165 baselink
= make_node (BASELINK
);
1166 TREE_TYPE (baselink
) = TREE_TYPE (functions
);
1167 BASELINK_BINFO (baselink
) = binfo
;
1168 BASELINK_ACCESS_BINFO (baselink
) = access_binfo
;
1169 BASELINK_FUNCTIONS (baselink
) = functions
;
1170 BASELINK_OPTYPE (baselink
) = optype
;
1175 /* Look for a member named NAME in an inheritance lattice dominated by
1176 XBASETYPE. If PROTECT is 0 or two, we do not check access. If it
1177 is 1, we enforce accessibility. If PROTECT is zero, then, for an
1178 ambiguous lookup, we return NULL. If PROTECT is 1, we issue error
1179 messages about inaccessible or ambiguous lookup. If PROTECT is 2,
1180 we return a TREE_LIST whose TREE_TYPE is error_mark_node and whose
1181 TREE_VALUEs are the list of ambiguous candidates.
1183 WANT_TYPE is 1 when we should only return TYPE_DECLs.
1185 If nothing can be found return NULL_TREE and do not issue an error. */
1188 lookup_member (tree xbasetype
, tree name
, int protect
, bool want_type
)
1190 tree rval
, rval_binfo
= NULL_TREE
;
1191 tree type
= NULL_TREE
, basetype_path
= NULL_TREE
;
1192 struct lookup_field_info lfi
;
1194 /* rval_binfo is the binfo associated with the found member, note,
1195 this can be set with useful information, even when rval is not
1196 set, because it must deal with ALL members, not just non-function
1197 members. It is used for ambiguity checking and the hidden
1198 checks. Whereas rval is only set if a proper (not hidden)
1199 non-function member is found. */
1201 const char *errstr
= 0;
1203 gcc_assert (TREE_CODE (name
) == IDENTIFIER_NODE
);
1205 if (TREE_CODE (xbasetype
) == TREE_BINFO
)
1207 type
= BINFO_TYPE (xbasetype
);
1208 basetype_path
= xbasetype
;
1212 if (!IS_AGGR_TYPE_CODE (TREE_CODE (xbasetype
)))
1215 xbasetype
= NULL_TREE
;
1218 type
= complete_type (type
);
1220 basetype_path
= TYPE_BINFO (type
);
1225 #ifdef GATHER_STATISTICS
1226 n_calls_lookup_field
++;
1227 #endif /* GATHER_STATISTICS */
1229 memset (&lfi
, 0, sizeof (lfi
));
1232 lfi
.want_type
= want_type
;
1233 dfs_walk_all (basetype_path
, &lookup_field_r
, NULL
, &lfi
);
1235 rval_binfo
= lfi
.rval_binfo
;
1237 type
= BINFO_TYPE (rval_binfo
);
1238 errstr
= lfi
.errstr
;
1240 /* If we are not interested in ambiguities, don't report them;
1241 just return NULL_TREE. */
1242 if (!protect
&& lfi
.ambiguous
)
1248 return lfi
.ambiguous
;
1255 In the case of overloaded function names, access control is
1256 applied to the function selected by overloaded resolution.
1258 We cannot check here, even if RVAL is only a single non-static
1259 member function, since we do not know what the "this" pointer
1262 class A { protected: void f(); };
1263 class B : public A {
1270 only the first call to "f" is valid. However, if the function is
1271 static, we can check. */
1273 && !really_overloaded_fn (rval
)
1274 && !(TREE_CODE (rval
) == FUNCTION_DECL
1275 && DECL_NONSTATIC_MEMBER_FUNCTION_P (rval
)))
1276 perform_or_defer_access_check (basetype_path
, rval
);
1278 if (errstr
&& protect
)
1280 error (errstr
, name
, type
);
1282 print_candidates (lfi
.ambiguous
);
1283 rval
= error_mark_node
;
1286 if (rval
&& is_overloaded_fn (rval
))
1287 rval
= build_baselink (rval_binfo
, basetype_path
, rval
,
1288 (IDENTIFIER_TYPENAME_P (name
)
1289 ? TREE_TYPE (name
): NULL_TREE
));
1293 /* Like lookup_member, except that if we find a function member we
1294 return NULL_TREE. */
1297 lookup_field (tree xbasetype
, tree name
, int protect
, bool want_type
)
1299 tree rval
= lookup_member (xbasetype
, name
, protect
, want_type
);
1301 /* Ignore functions, but propagate the ambiguity list. */
1302 if (!error_operand_p (rval
)
1303 && (rval
&& BASELINK_P (rval
)))
1309 /* Like lookup_member, except that if we find a non-function member we
1310 return NULL_TREE. */
1313 lookup_fnfields (tree xbasetype
, tree name
, int protect
)
1315 tree rval
= lookup_member (xbasetype
, name
, protect
, /*want_type=*/false);
1317 /* Ignore non-functions, but propagate the ambiguity list. */
1318 if (!error_operand_p (rval
)
1319 && (rval
&& !BASELINK_P (rval
)))
1325 /* Return the index in the CLASSTYPE_METHOD_VEC for CLASS_TYPE
1326 corresponding to "operator TYPE ()", or -1 if there is no such
1327 operator. Only CLASS_TYPE itself is searched; this routine does
1328 not scan the base classes of CLASS_TYPE. */
1331 lookup_conversion_operator (tree class_type
, tree type
)
1335 if (TYPE_HAS_CONVERSION (class_type
))
1339 VEC(tree
,gc
) *methods
= CLASSTYPE_METHOD_VEC (class_type
);
1341 for (i
= CLASSTYPE_FIRST_CONVERSION_SLOT
;
1342 VEC_iterate (tree
, methods
, i
, fn
); ++i
)
1344 /* All the conversion operators come near the beginning of
1345 the class. Therefore, if FN is not a conversion
1346 operator, there is no matching conversion operator in
1348 fn
= OVL_CURRENT (fn
);
1349 if (!DECL_CONV_FN_P (fn
))
1352 if (TREE_CODE (fn
) == TEMPLATE_DECL
)
1353 /* All the templated conversion functions are on the same
1354 slot, so remember it. */
1356 else if (same_type_p (DECL_CONV_FN_TYPE (fn
), type
))
1364 /* TYPE is a class type. Return the index of the fields within
1365 the method vector with name NAME, or -1 is no such field exists. */
1368 lookup_fnfields_1 (tree type
, tree name
)
1370 VEC(tree
,gc
) *method_vec
;
1375 if (!CLASS_TYPE_P (type
))
1378 if (COMPLETE_TYPE_P (type
))
1380 if ((name
== ctor_identifier
1381 || name
== base_ctor_identifier
1382 || name
== complete_ctor_identifier
))
1384 if (CLASSTYPE_LAZY_DEFAULT_CTOR (type
))
1385 lazily_declare_fn (sfk_constructor
, type
);
1386 if (CLASSTYPE_LAZY_COPY_CTOR (type
))
1387 lazily_declare_fn (sfk_copy_constructor
, type
);
1389 else if (name
== ansi_assopname(NOP_EXPR
)
1390 && CLASSTYPE_LAZY_ASSIGNMENT_OP (type
))
1391 lazily_declare_fn (sfk_assignment_operator
, type
);
1392 else if ((name
== dtor_identifier
1393 || name
== base_dtor_identifier
1394 || name
== complete_dtor_identifier
1395 || name
== deleting_dtor_identifier
)
1396 && CLASSTYPE_LAZY_DESTRUCTOR (type
))
1397 lazily_declare_fn (sfk_destructor
, type
);
1400 method_vec
= CLASSTYPE_METHOD_VEC (type
);
1404 #ifdef GATHER_STATISTICS
1405 n_calls_lookup_fnfields_1
++;
1406 #endif /* GATHER_STATISTICS */
1408 /* Constructors are first... */
1409 if (name
== ctor_identifier
)
1411 fn
= CLASSTYPE_CONSTRUCTORS (type
);
1412 return fn
? CLASSTYPE_CONSTRUCTOR_SLOT
: -1;
1414 /* and destructors are second. */
1415 if (name
== dtor_identifier
)
1417 fn
= CLASSTYPE_DESTRUCTORS (type
);
1418 return fn
? CLASSTYPE_DESTRUCTOR_SLOT
: -1;
1420 if (IDENTIFIER_TYPENAME_P (name
))
1421 return lookup_conversion_operator (type
, TREE_TYPE (name
));
1423 /* Skip the conversion operators. */
1424 for (i
= CLASSTYPE_FIRST_CONVERSION_SLOT
;
1425 VEC_iterate (tree
, method_vec
, i
, fn
);
1427 if (!DECL_CONV_FN_P (OVL_CURRENT (fn
)))
1430 /* If the type is complete, use binary search. */
1431 if (COMPLETE_TYPE_P (type
))
1437 hi
= VEC_length (tree
, method_vec
);
1442 #ifdef GATHER_STATISTICS
1443 n_outer_fields_searched
++;
1444 #endif /* GATHER_STATISTICS */
1446 tmp
= VEC_index (tree
, method_vec
, i
);
1447 tmp
= DECL_NAME (OVL_CURRENT (tmp
));
1450 else if (tmp
< name
)
1457 for (; VEC_iterate (tree
, method_vec
, i
, fn
); ++i
)
1459 #ifdef GATHER_STATISTICS
1460 n_outer_fields_searched
++;
1461 #endif /* GATHER_STATISTICS */
1462 if (DECL_NAME (OVL_CURRENT (fn
)) == name
)
1469 /* Like lookup_fnfields_1, except that the name is extracted from
1470 FUNCTION, which is a FUNCTION_DECL or a TEMPLATE_DECL. */
1473 class_method_index_for_fn (tree class_type
, tree function
)
1475 gcc_assert (TREE_CODE (function
) == FUNCTION_DECL
1476 || DECL_FUNCTION_TEMPLATE_P (function
));
1478 return lookup_fnfields_1 (class_type
,
1479 DECL_CONSTRUCTOR_P (function
) ? ctor_identifier
:
1480 DECL_DESTRUCTOR_P (function
) ? dtor_identifier
:
1481 DECL_NAME (function
));
1485 /* DECL is the result of a qualified name lookup. QUALIFYING_SCOPE is
1486 the class or namespace used to qualify the name. CONTEXT_CLASS is
1487 the class corresponding to the object in which DECL will be used.
1488 Return a possibly modified version of DECL that takes into account
1491 In particular, consider an expression like `B::m' in the context of
1492 a derived class `D'. If `B::m' has been resolved to a BASELINK,
1493 then the most derived class indicated by the BASELINK_BINFO will be
1494 `B', not `D'. This function makes that adjustment. */
1497 adjust_result_of_qualified_name_lookup (tree decl
,
1498 tree qualifying_scope
,
1501 if (context_class
&& context_class
!= error_mark_node
1502 && CLASS_TYPE_P (context_class
)
1503 && CLASS_TYPE_P (qualifying_scope
)
1504 && DERIVED_FROM_P (qualifying_scope
, context_class
)
1505 && BASELINK_P (decl
))
1509 /* Look for the QUALIFYING_SCOPE as a base of the CONTEXT_CLASS.
1510 Because we do not yet know which function will be chosen by
1511 overload resolution, we cannot yet check either accessibility
1512 or ambiguity -- in either case, the choice of a static member
1513 function might make the usage valid. */
1514 base
= lookup_base (context_class
, qualifying_scope
,
1515 ba_unique
| ba_quiet
, NULL
);
1518 BASELINK_ACCESS_BINFO (decl
) = base
;
1519 BASELINK_BINFO (decl
)
1520 = lookup_base (base
, BINFO_TYPE (BASELINK_BINFO (decl
)),
1521 ba_unique
| ba_quiet
,
1530 /* Walk the class hierarchy within BINFO, in a depth-first traversal.
1531 PRE_FN is called in preorder, while POST_FN is called in postorder.
1532 If PRE_FN returns DFS_SKIP_BASES, child binfos will not be
1533 walked. If PRE_FN or POST_FN returns a different non-NULL value,
1534 that value is immediately returned and the walk is terminated. One
1535 of PRE_FN and POST_FN can be NULL. At each node, PRE_FN and
1536 POST_FN are passed the binfo to examine and the caller's DATA
1537 value. All paths are walked, thus virtual and morally virtual
1538 binfos can be multiply walked. */
1541 dfs_walk_all (tree binfo
, tree (*pre_fn
) (tree
, void *),
1542 tree (*post_fn
) (tree
, void *), void *data
)
1548 /* Call the pre-order walking function. */
1551 rval
= pre_fn (binfo
, data
);
1554 if (rval
== dfs_skip_bases
)
1560 /* Find the next child binfo to walk. */
1561 for (ix
= 0; BINFO_BASE_ITERATE (binfo
, ix
, base_binfo
); ix
++)
1563 rval
= dfs_walk_all (base_binfo
, pre_fn
, post_fn
, data
);
1569 /* Call the post-order walking function. */
1572 rval
= post_fn (binfo
, data
);
1573 gcc_assert (rval
!= dfs_skip_bases
);
1580 /* Worker for dfs_walk_once. This behaves as dfs_walk_all, except
1581 that binfos are walked at most once. */
1584 dfs_walk_once_r (tree binfo
, tree (*pre_fn
) (tree
, void *),
1585 tree (*post_fn
) (tree
, void *), void *data
)
1591 /* Call the pre-order walking function. */
1594 rval
= pre_fn (binfo
, data
);
1597 if (rval
== dfs_skip_bases
)
1604 /* Find the next child binfo to walk. */
1605 for (ix
= 0; BINFO_BASE_ITERATE (binfo
, ix
, base_binfo
); ix
++)
1607 if (BINFO_VIRTUAL_P (base_binfo
))
1609 if (BINFO_MARKED (base_binfo
))
1611 BINFO_MARKED (base_binfo
) = 1;
1614 rval
= dfs_walk_once_r (base_binfo
, pre_fn
, post_fn
, data
);
1620 /* Call the post-order walking function. */
1623 rval
= post_fn (binfo
, data
);
1624 gcc_assert (rval
!= dfs_skip_bases
);
1631 /* Worker for dfs_walk_once. Recursively unmark the virtual base binfos of
1635 dfs_unmark_r (tree binfo
)
1640 /* Process the basetypes. */
1641 for (ix
= 0; BINFO_BASE_ITERATE (binfo
, ix
, base_binfo
); ix
++)
1643 if (BINFO_VIRTUAL_P (base_binfo
))
1645 if (!BINFO_MARKED (base_binfo
))
1647 BINFO_MARKED (base_binfo
) = 0;
1649 /* Only walk, if it can contain more virtual bases. */
1650 if (CLASSTYPE_VBASECLASSES (BINFO_TYPE (base_binfo
)))
1651 dfs_unmark_r (base_binfo
);
1655 /* Like dfs_walk_all, except that binfos are not multiply walked. For
1656 non-diamond shaped hierarchies this is the same as dfs_walk_all.
1657 For diamond shaped hierarchies we must mark the virtual bases, to
1658 avoid multiple walks. */
1661 dfs_walk_once (tree binfo
, tree (*pre_fn
) (tree
, void *),
1662 tree (*post_fn
) (tree
, void *), void *data
)
1664 static int active
= 0; /* We must not be called recursively. */
1667 gcc_assert (pre_fn
|| post_fn
);
1668 gcc_assert (!active
);
1671 if (!CLASSTYPE_DIAMOND_SHAPED_P (BINFO_TYPE (binfo
)))
1672 /* We are not diamond shaped, and therefore cannot encounter the
1673 same binfo twice. */
1674 rval
= dfs_walk_all (binfo
, pre_fn
, post_fn
, data
);
1677 rval
= dfs_walk_once_r (binfo
, pre_fn
, post_fn
, data
);
1678 if (!BINFO_INHERITANCE_CHAIN (binfo
))
1680 /* We are at the top of the hierarchy, and can use the
1681 CLASSTYPE_VBASECLASSES list for unmarking the virtual
1683 VEC(tree
,gc
) *vbases
;
1687 for (vbases
= CLASSTYPE_VBASECLASSES (BINFO_TYPE (binfo
)), ix
= 0;
1688 VEC_iterate (tree
, vbases
, ix
, base_binfo
); ix
++)
1689 BINFO_MARKED (base_binfo
) = 0;
1692 dfs_unmark_r (binfo
);
1700 /* Worker function for dfs_walk_once_accessible. Behaves like
1701 dfs_walk_once_r, except (a) FRIENDS_P is true if special
1702 access given by the current context should be considered, (b) ONCE
1703 indicates whether bases should be marked during traversal. */
1706 dfs_walk_once_accessible_r (tree binfo
, bool friends_p
, bool once
,
1707 tree (*pre_fn
) (tree
, void *),
1708 tree (*post_fn
) (tree
, void *), void *data
)
1710 tree rval
= NULL_TREE
;
1714 /* Call the pre-order walking function. */
1717 rval
= pre_fn (binfo
, data
);
1720 if (rval
== dfs_skip_bases
)
1727 /* Find the next child binfo to walk. */
1728 for (ix
= 0; BINFO_BASE_ITERATE (binfo
, ix
, base_binfo
); ix
++)
1730 bool mark
= once
&& BINFO_VIRTUAL_P (base_binfo
);
1732 if (mark
&& BINFO_MARKED (base_binfo
))
1735 /* If the base is inherited via private or protected
1736 inheritance, then we can't see it, unless we are a friend of
1737 the current binfo. */
1738 if (BINFO_BASE_ACCESS (binfo
, ix
) != access_public_node
)
1743 scope
= current_scope ();
1745 || TREE_CODE (scope
) == NAMESPACE_DECL
1746 || !is_friend (BINFO_TYPE (binfo
), scope
))
1751 BINFO_MARKED (base_binfo
) = 1;
1753 rval
= dfs_walk_once_accessible_r (base_binfo
, friends_p
, once
,
1754 pre_fn
, post_fn
, data
);
1760 /* Call the post-order walking function. */
1763 rval
= post_fn (binfo
, data
);
1764 gcc_assert (rval
!= dfs_skip_bases
);
1771 /* Like dfs_walk_once except that only accessible bases are walked.
1772 FRIENDS_P indicates whether friendship of the local context
1773 should be considered when determining accessibility. */
1776 dfs_walk_once_accessible (tree binfo
, bool friends_p
,
1777 tree (*pre_fn
) (tree
, void *),
1778 tree (*post_fn
) (tree
, void *), void *data
)
1780 bool diamond_shaped
= CLASSTYPE_DIAMOND_SHAPED_P (BINFO_TYPE (binfo
));
1781 tree rval
= dfs_walk_once_accessible_r (binfo
, friends_p
, diamond_shaped
,
1782 pre_fn
, post_fn
, data
);
1786 if (!BINFO_INHERITANCE_CHAIN (binfo
))
1788 /* We are at the top of the hierarchy, and can use the
1789 CLASSTYPE_VBASECLASSES list for unmarking the virtual
1791 VEC(tree
,gc
) *vbases
;
1795 for (vbases
= CLASSTYPE_VBASECLASSES (BINFO_TYPE (binfo
)), ix
= 0;
1796 VEC_iterate (tree
, vbases
, ix
, base_binfo
); ix
++)
1797 BINFO_MARKED (base_binfo
) = 0;
1800 dfs_unmark_r (binfo
);
1805 /* Check that virtual overrider OVERRIDER is acceptable for base function
1806 BASEFN. Issue diagnostic, and return zero, if unacceptable. */
1809 check_final_overrider (tree overrider
, tree basefn
)
1811 tree over_type
= TREE_TYPE (overrider
);
1812 tree base_type
= TREE_TYPE (basefn
);
1813 tree over_return
= TREE_TYPE (over_type
);
1814 tree base_return
= TREE_TYPE (base_type
);
1815 tree over_throw
= TYPE_RAISES_EXCEPTIONS (over_type
);
1816 tree base_throw
= TYPE_RAISES_EXCEPTIONS (base_type
);
1819 if (DECL_INVALID_OVERRIDER_P (overrider
))
1822 if (same_type_p (base_return
, over_return
))
1824 else if ((CLASS_TYPE_P (over_return
) && CLASS_TYPE_P (base_return
))
1825 || (TREE_CODE (base_return
) == TREE_CODE (over_return
)
1826 && POINTER_TYPE_P (base_return
)))
1828 /* Potentially covariant. */
1829 unsigned base_quals
, over_quals
;
1831 fail
= !POINTER_TYPE_P (base_return
);
1834 fail
= cp_type_quals (base_return
) != cp_type_quals (over_return
);
1836 base_return
= TREE_TYPE (base_return
);
1837 over_return
= TREE_TYPE (over_return
);
1839 base_quals
= cp_type_quals (base_return
);
1840 over_quals
= cp_type_quals (over_return
);
1842 if ((base_quals
& over_quals
) != over_quals
)
1845 if (CLASS_TYPE_P (base_return
) && CLASS_TYPE_P (over_return
))
1847 tree binfo
= lookup_base (over_return
, base_return
,
1848 ba_check
| ba_quiet
, NULL
);
1854 && can_convert (TREE_TYPE (base_type
), TREE_TYPE (over_type
)))
1855 /* GNU extension, allow trivial pointer conversions such as
1856 converting to void *, or qualification conversion. */
1858 /* can_convert will permit user defined conversion from a
1859 (reference to) class type. We must reject them. */
1860 over_return
= non_reference (TREE_TYPE (over_type
));
1861 if (CLASS_TYPE_P (over_return
))
1865 warning (0, "deprecated covariant return type for %q+#D",
1867 warning (0, " overriding %q+#D", basefn
);
1881 error ("invalid covariant return type for %q+#D", overrider
);
1882 error (" overriding %q+#D", basefn
);
1886 error ("conflicting return type specified for %q+#D", overrider
);
1887 error (" overriding %q+#D", basefn
);
1889 DECL_INVALID_OVERRIDER_P (overrider
) = 1;
1893 /* Check throw specifier is at least as strict. */
1894 if (!comp_except_specs (base_throw
, over_throw
, 0))
1896 error ("looser throw specifier for %q+#F", overrider
);
1897 error (" overriding %q+#F", basefn
);
1898 DECL_INVALID_OVERRIDER_P (overrider
) = 1;
1905 /* Given a class TYPE, and a function decl FNDECL, look for
1906 virtual functions in TYPE's hierarchy which FNDECL overrides.
1907 We do not look in TYPE itself, only its bases.
1909 Returns nonzero, if we find any. Set FNDECL's DECL_VIRTUAL_P, if we
1910 find that it overrides anything.
1912 We check that every function which is overridden, is correctly
1916 look_for_overrides (tree type
, tree fndecl
)
1918 tree binfo
= TYPE_BINFO (type
);
1923 for (ix
= 0; BINFO_BASE_ITERATE (binfo
, ix
, base_binfo
); ix
++)
1925 tree basetype
= BINFO_TYPE (base_binfo
);
1927 if (TYPE_POLYMORPHIC_P (basetype
))
1928 found
+= look_for_overrides_r (basetype
, fndecl
);
1933 /* Look in TYPE for virtual functions with the same signature as
1937 look_for_overrides_here (tree type
, tree fndecl
)
1941 /* If there are no methods in TYPE (meaning that only implicitly
1942 declared methods will ever be provided for TYPE), then there are
1943 no virtual functions. */
1944 if (!CLASSTYPE_METHOD_VEC (type
))
1947 if (DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P (fndecl
))
1948 ix
= CLASSTYPE_DESTRUCTOR_SLOT
;
1950 ix
= lookup_fnfields_1 (type
, DECL_NAME (fndecl
));
1953 tree fns
= VEC_index (tree
, CLASSTYPE_METHOD_VEC (type
), ix
);
1955 for (; fns
; fns
= OVL_NEXT (fns
))
1957 tree fn
= OVL_CURRENT (fns
);
1959 if (!DECL_VIRTUAL_P (fn
))
1960 /* Not a virtual. */;
1961 else if (DECL_CONTEXT (fn
) != type
)
1962 /* Introduced with a using declaration. */;
1963 else if (DECL_STATIC_FUNCTION_P (fndecl
))
1965 tree btypes
= TYPE_ARG_TYPES (TREE_TYPE (fn
));
1966 tree dtypes
= TYPE_ARG_TYPES (TREE_TYPE (fndecl
));
1967 if (compparms (TREE_CHAIN (btypes
), dtypes
))
1970 else if (same_signature_p (fndecl
, fn
))
1977 /* Look in TYPE for virtual functions overridden by FNDECL. Check both
1978 TYPE itself and its bases. */
1981 look_for_overrides_r (tree type
, tree fndecl
)
1983 tree fn
= look_for_overrides_here (type
, fndecl
);
1986 if (DECL_STATIC_FUNCTION_P (fndecl
))
1988 /* A static member function cannot match an inherited
1989 virtual member function. */
1990 error ("%q+#D cannot be declared", fndecl
);
1991 error (" since %q+#D declared in base class", fn
);
1995 /* It's definitely virtual, even if not explicitly set. */
1996 DECL_VIRTUAL_P (fndecl
) = 1;
1997 check_final_overrider (fndecl
, fn
);
2002 /* We failed to find one declared in this class. Look in its bases. */
2003 return look_for_overrides (type
, fndecl
);
2006 /* Called via dfs_walk from dfs_get_pure_virtuals. */
2009 dfs_get_pure_virtuals (tree binfo
, void *data
)
2011 tree type
= (tree
) data
;
2013 /* We're not interested in primary base classes; the derived class
2014 of which they are a primary base will contain the information we
2016 if (!BINFO_PRIMARY_P (binfo
))
2020 for (virtuals
= BINFO_VIRTUALS (binfo
);
2022 virtuals
= TREE_CHAIN (virtuals
))
2023 if (DECL_PURE_VIRTUAL_P (BV_FN (virtuals
)))
2024 VEC_safe_push (tree
, gc
, CLASSTYPE_PURE_VIRTUALS (type
),
2031 /* Set CLASSTYPE_PURE_VIRTUALS for TYPE. */
2034 get_pure_virtuals (tree type
)
2036 /* Clear the CLASSTYPE_PURE_VIRTUALS list; whatever is already there
2037 is going to be overridden. */
2038 CLASSTYPE_PURE_VIRTUALS (type
) = NULL
;
2039 /* Now, run through all the bases which are not primary bases, and
2040 collect the pure virtual functions. We look at the vtable in
2041 each class to determine what pure virtual functions are present.
2042 (A primary base is not interesting because the derived class of
2043 which it is a primary base will contain vtable entries for the
2044 pure virtuals in the base class. */
2045 dfs_walk_once (TYPE_BINFO (type
), NULL
, dfs_get_pure_virtuals
, type
);
2048 /* Debug info for C++ classes can get very large; try to avoid
2049 emitting it everywhere.
2051 Note that this optimization wins even when the target supports
2052 BINCL (if only slightly), and reduces the amount of work for the
2056 maybe_suppress_debug_info (tree t
)
2058 if (write_symbols
== NO_DEBUG
)
2061 /* We might have set this earlier in cp_finish_decl. */
2062 TYPE_DECL_SUPPRESS_DEBUG (TYPE_MAIN_DECL (t
)) = 0;
2064 /* Always emit the information for each class every time. */
2065 if (flag_emit_class_debug_always
)
2068 /* If we already know how we're handling this class, handle debug info
2070 if (CLASSTYPE_INTERFACE_KNOWN (t
))
2072 if (CLASSTYPE_INTERFACE_ONLY (t
))
2073 TYPE_DECL_SUPPRESS_DEBUG (TYPE_MAIN_DECL (t
)) = 1;
2074 /* else don't set it. */
2076 /* If the class has a vtable, write out the debug info along with
2078 else if (TYPE_CONTAINS_VPTR_P (t
))
2079 TYPE_DECL_SUPPRESS_DEBUG (TYPE_MAIN_DECL (t
)) = 1;
2081 /* Otherwise, just emit the debug info normally. */
2084 /* Note that we want debugging information for a base class of a class
2085 whose vtable is being emitted. Normally, this would happen because
2086 calling the constructor for a derived class implies calling the
2087 constructors for all bases, which involve initializing the
2088 appropriate vptr with the vtable for the base class; but in the
2089 presence of optimization, this initialization may be optimized
2090 away, so we tell finish_vtable_vardecl that we want the debugging
2091 information anyway. */
2094 dfs_debug_mark (tree binfo
, void *data ATTRIBUTE_UNUSED
)
2096 tree t
= BINFO_TYPE (binfo
);
2098 if (CLASSTYPE_DEBUG_REQUESTED (t
))
2099 return dfs_skip_bases
;
2101 CLASSTYPE_DEBUG_REQUESTED (t
) = 1;
2106 /* Write out the debugging information for TYPE, whose vtable is being
2107 emitted. Also walk through our bases and note that we want to
2108 write out information for them. This avoids the problem of not
2109 writing any debug info for intermediate basetypes whose
2110 constructors, and thus the references to their vtables, and thus
2111 the vtables themselves, were optimized away. */
2114 note_debug_info_needed (tree type
)
2116 if (TYPE_DECL_SUPPRESS_DEBUG (TYPE_NAME (type
)))
2118 TYPE_DECL_SUPPRESS_DEBUG (TYPE_NAME (type
)) = 0;
2119 rest_of_type_compilation (type
, toplevel_bindings_p ());
2122 dfs_walk_all (TYPE_BINFO (type
), dfs_debug_mark
, NULL
, 0);
2126 print_search_statistics (void)
2128 #ifdef GATHER_STATISTICS
2129 fprintf (stderr
, "%d fields searched in %d[%d] calls to lookup_field[_1]\n",
2130 n_fields_searched
, n_calls_lookup_field
, n_calls_lookup_field_1
);
2131 fprintf (stderr
, "%d fnfields searched in %d calls to lookup_fnfields\n",
2132 n_outer_fields_searched
, n_calls_lookup_fnfields
);
2133 fprintf (stderr
, "%d calls to get_base_type\n", n_calls_get_base_type
);
2134 #else /* GATHER_STATISTICS */
2135 fprintf (stderr
, "no search statistics\n");
2136 #endif /* GATHER_STATISTICS */
2140 reinit_search_statistics (void)
2142 #ifdef GATHER_STATISTICS
2143 n_fields_searched
= 0;
2144 n_calls_lookup_field
= 0, n_calls_lookup_field_1
= 0;
2145 n_calls_lookup_fnfields
= 0, n_calls_lookup_fnfields_1
= 0;
2146 n_calls_get_base_type
= 0;
2147 n_outer_fields_searched
= 0;
2148 n_contexts_saved
= 0;
2149 #endif /* GATHER_STATISTICS */
2152 /* Helper for lookup_conversions_r. TO_TYPE is the type converted to
2153 by a conversion op in base BINFO. VIRTUAL_DEPTH is nonzero if
2154 BINFO is morally virtual, and VIRTUALNESS is nonzero if virtual
2155 bases have been encountered already in the tree walk. PARENT_CONVS
2156 is the list of lists of conversion functions that could hide CONV
2157 and OTHER_CONVS is the list of lists of conversion functions that
2158 could hide or be hidden by CONV, should virtualness be involved in
2159 the hierarchy. Merely checking the conversion op's name is not
2160 enough because two conversion operators to the same type can have
2161 different names. Return nonzero if we are visible. */
2164 check_hidden_convs (tree binfo
, int virtual_depth
, int virtualness
,
2165 tree to_type
, tree parent_convs
, tree other_convs
)
2169 /* See if we are hidden by a parent conversion. */
2170 for (level
= parent_convs
; level
; level
= TREE_CHAIN (level
))
2171 for (probe
= TREE_VALUE (level
); probe
; probe
= TREE_CHAIN (probe
))
2172 if (same_type_p (to_type
, TREE_TYPE (probe
)))
2175 if (virtual_depth
|| virtualness
)
2177 /* In a virtual hierarchy, we could be hidden, or could hide a
2178 conversion function on the other_convs list. */
2179 for (level
= other_convs
; level
; level
= TREE_CHAIN (level
))
2185 if (!(virtual_depth
|| TREE_STATIC (level
)))
2186 /* Neither is morally virtual, so cannot hide each other. */
2189 if (!TREE_VALUE (level
))
2190 /* They evaporated away already. */
2193 they_hide_us
= (virtual_depth
2194 && original_binfo (binfo
, TREE_PURPOSE (level
)));
2195 we_hide_them
= (!they_hide_us
&& TREE_STATIC (level
)
2196 && original_binfo (TREE_PURPOSE (level
), binfo
));
2198 if (!(we_hide_them
|| they_hide_us
))
2199 /* Neither is within the other, so no hiding can occur. */
2202 for (prev
= &TREE_VALUE (level
), other
= *prev
; other
;)
2204 if (same_type_p (to_type
, TREE_TYPE (other
)))
2207 /* We are hidden. */
2212 /* We hide the other one. */
2213 other
= TREE_CHAIN (other
);
2218 prev
= &TREE_CHAIN (other
);
2226 /* Helper for lookup_conversions_r. PARENT_CONVS is a list of lists
2227 of conversion functions, the first slot will be for the current
2228 binfo, if MY_CONVS is non-NULL. CHILD_CONVS is the list of lists
2229 of conversion functions from children of the current binfo,
2230 concatenated with conversions from elsewhere in the hierarchy --
2231 that list begins with OTHER_CONVS. Return a single list of lists
2232 containing only conversions from the current binfo and its
2236 split_conversions (tree my_convs
, tree parent_convs
,
2237 tree child_convs
, tree other_convs
)
2242 /* Remove the original other_convs portion from child_convs. */
2243 for (prev
= NULL
, t
= child_convs
;
2244 t
!= other_convs
; prev
= t
, t
= TREE_CHAIN (t
))
2248 TREE_CHAIN (prev
) = NULL_TREE
;
2250 child_convs
= NULL_TREE
;
2252 /* Attach the child convs to any we had at this level. */
2255 my_convs
= parent_convs
;
2256 TREE_CHAIN (my_convs
) = child_convs
;
2259 my_convs
= child_convs
;
2264 /* Worker for lookup_conversions. Lookup conversion functions in
2265 BINFO and its children. VIRTUAL_DEPTH is nonzero, if BINFO is in
2266 a morally virtual base, and VIRTUALNESS is nonzero, if we've
2267 encountered virtual bases already in the tree walk. PARENT_CONVS &
2268 PARENT_TPL_CONVS are lists of list of conversions within parent
2269 binfos. OTHER_CONVS and OTHER_TPL_CONVS are conversions found
2270 elsewhere in the tree. Return the conversions found within this
2271 portion of the graph in CONVS and TPL_CONVS. Return nonzero is we
2272 encountered virtualness. We keep template and non-template
2273 conversions separate, to avoid unnecessary type comparisons.
2275 The located conversion functions are held in lists of lists. The
2276 TREE_VALUE of the outer list is the list of conversion functions
2277 found in a particular binfo. The TREE_PURPOSE of both the outer
2278 and inner lists is the binfo at which those conversions were
2279 found. TREE_STATIC is set for those lists within of morally
2280 virtual binfos. The TREE_VALUE of the inner list is the conversion
2281 function or overload itself. The TREE_TYPE of each inner list node
2282 is the converted-to type. */
2285 lookup_conversions_r (tree binfo
,
2286 int virtual_depth
, int virtualness
,
2287 tree parent_convs
, tree parent_tpl_convs
,
2288 tree other_convs
, tree other_tpl_convs
,
2289 tree
*convs
, tree
*tpl_convs
)
2291 int my_virtualness
= 0;
2292 tree my_convs
= NULL_TREE
;
2293 tree my_tpl_convs
= NULL_TREE
;
2294 tree child_convs
= NULL_TREE
;
2295 tree child_tpl_convs
= NULL_TREE
;
2298 VEC(tree
,gc
) *method_vec
= CLASSTYPE_METHOD_VEC (BINFO_TYPE (binfo
));
2301 /* If we have no conversion operators, then don't look. */
2302 if (!TYPE_HAS_CONVERSION (BINFO_TYPE (binfo
)))
2304 *convs
= *tpl_convs
= NULL_TREE
;
2309 if (BINFO_VIRTUAL_P (binfo
))
2312 /* First, locate the unhidden ones at this level. */
2313 for (i
= CLASSTYPE_FIRST_CONVERSION_SLOT
;
2314 VEC_iterate (tree
, method_vec
, i
, conv
);
2317 tree cur
= OVL_CURRENT (conv
);
2319 if (!DECL_CONV_FN_P (cur
))
2322 if (TREE_CODE (cur
) == TEMPLATE_DECL
)
2324 /* Only template conversions can be overloaded, and we must
2325 flatten them out and check each one individually. */
2328 for (tpls
= conv
; tpls
; tpls
= OVL_NEXT (tpls
))
2330 tree tpl
= OVL_CURRENT (tpls
);
2331 tree type
= DECL_CONV_FN_TYPE (tpl
);
2333 if (check_hidden_convs (binfo
, virtual_depth
, virtualness
,
2334 type
, parent_tpl_convs
, other_tpl_convs
))
2336 my_tpl_convs
= tree_cons (binfo
, tpl
, my_tpl_convs
);
2337 TREE_TYPE (my_tpl_convs
) = type
;
2340 TREE_STATIC (my_tpl_convs
) = 1;
2348 tree name
= DECL_NAME (cur
);
2350 if (!IDENTIFIER_MARKED (name
))
2352 tree type
= DECL_CONV_FN_TYPE (cur
);
2354 if (check_hidden_convs (binfo
, virtual_depth
, virtualness
,
2355 type
, parent_convs
, other_convs
))
2357 my_convs
= tree_cons (binfo
, conv
, my_convs
);
2358 TREE_TYPE (my_convs
) = type
;
2361 TREE_STATIC (my_convs
) = 1;
2364 IDENTIFIER_MARKED (name
) = 1;
2372 parent_convs
= tree_cons (binfo
, my_convs
, parent_convs
);
2374 TREE_STATIC (parent_convs
) = 1;
2379 parent_tpl_convs
= tree_cons (binfo
, my_tpl_convs
, parent_tpl_convs
);
2381 TREE_STATIC (parent_tpl_convs
) = 1;
2384 child_convs
= other_convs
;
2385 child_tpl_convs
= other_tpl_convs
;
2387 /* Now iterate over each base, looking for more conversions. */
2388 for (i
= 0; BINFO_BASE_ITERATE (binfo
, i
, base_binfo
); i
++)
2390 tree base_convs
, base_tpl_convs
;
2391 unsigned base_virtualness
;
2393 base_virtualness
= lookup_conversions_r (base_binfo
,
2394 virtual_depth
, virtualness
,
2395 parent_convs
, parent_tpl_convs
,
2396 child_convs
, child_tpl_convs
,
2397 &base_convs
, &base_tpl_convs
);
2398 if (base_virtualness
)
2399 my_virtualness
= virtualness
= 1;
2400 child_convs
= chainon (base_convs
, child_convs
);
2401 child_tpl_convs
= chainon (base_tpl_convs
, child_tpl_convs
);
2404 /* Unmark the conversions found at this level */
2405 for (conv
= my_convs
; conv
; conv
= TREE_CHAIN (conv
))
2406 IDENTIFIER_MARKED (DECL_NAME (OVL_CURRENT (TREE_VALUE (conv
)))) = 0;
2408 *convs
= split_conversions (my_convs
, parent_convs
,
2409 child_convs
, other_convs
);
2410 *tpl_convs
= split_conversions (my_tpl_convs
, parent_tpl_convs
,
2411 child_tpl_convs
, other_tpl_convs
);
2413 return my_virtualness
;
2416 /* Return a TREE_LIST containing all the non-hidden user-defined
2417 conversion functions for TYPE (and its base-classes). The
2418 TREE_VALUE of each node is the FUNCTION_DECL of the conversion
2419 function. The TREE_PURPOSE is the BINFO from which the conversion
2420 functions in this node were selected. This function is effectively
2421 performing a set of member lookups as lookup_fnfield does, but
2422 using the type being converted to as the unique key, rather than the
2426 lookup_conversions (tree type
)
2428 tree convs
, tpl_convs
;
2429 tree list
= NULL_TREE
;
2431 complete_type (type
);
2432 if (!TYPE_BINFO (type
))
2435 lookup_conversions_r (TYPE_BINFO (type
), 0, 0,
2436 NULL_TREE
, NULL_TREE
, NULL_TREE
, NULL_TREE
,
2437 &convs
, &tpl_convs
);
2439 /* Flatten the list-of-lists */
2440 for (; convs
; convs
= TREE_CHAIN (convs
))
2444 for (probe
= TREE_VALUE (convs
); probe
; probe
= next
)
2446 next
= TREE_CHAIN (probe
);
2448 TREE_CHAIN (probe
) = list
;
2453 for (; tpl_convs
; tpl_convs
= TREE_CHAIN (tpl_convs
))
2457 for (probe
= TREE_VALUE (tpl_convs
); probe
; probe
= next
)
2459 next
= TREE_CHAIN (probe
);
2461 TREE_CHAIN (probe
) = list
;
2469 /* Returns the binfo of the first direct or indirect virtual base derived
2470 from BINFO, or NULL if binfo is not via virtual. */
2473 binfo_from_vbase (tree binfo
)
2475 for (; binfo
; binfo
= BINFO_INHERITANCE_CHAIN (binfo
))
2477 if (BINFO_VIRTUAL_P (binfo
))
2483 /* Returns the binfo of the first direct or indirect virtual base derived
2484 from BINFO up to the TREE_TYPE, LIMIT, or NULL if binfo is not
2488 binfo_via_virtual (tree binfo
, tree limit
)
2490 if (limit
&& !CLASSTYPE_VBASECLASSES (limit
))
2491 /* LIMIT has no virtual bases, so BINFO cannot be via one. */
2494 for (; binfo
&& !SAME_BINFO_TYPE_P (BINFO_TYPE (binfo
), limit
);
2495 binfo
= BINFO_INHERITANCE_CHAIN (binfo
))
2497 if (BINFO_VIRTUAL_P (binfo
))
2503 /* BINFO is a base binfo in the complete type BINFO_TYPE (HERE).
2504 Find the equivalent binfo within whatever graph HERE is located.
2505 This is the inverse of original_binfo. */
2508 copied_binfo (tree binfo
, tree here
)
2510 tree result
= NULL_TREE
;
2512 if (BINFO_VIRTUAL_P (binfo
))
2516 for (t
= here
; BINFO_INHERITANCE_CHAIN (t
);
2517 t
= BINFO_INHERITANCE_CHAIN (t
))
2520 result
= binfo_for_vbase (BINFO_TYPE (binfo
), BINFO_TYPE (t
));
2522 else if (BINFO_INHERITANCE_CHAIN (binfo
))
2528 cbinfo
= copied_binfo (BINFO_INHERITANCE_CHAIN (binfo
), here
);
2529 for (ix
= 0; BINFO_BASE_ITERATE (cbinfo
, ix
, base_binfo
); ix
++)
2530 if (SAME_BINFO_TYPE_P (BINFO_TYPE (base_binfo
), BINFO_TYPE (binfo
)))
2532 result
= base_binfo
;
2538 gcc_assert (SAME_BINFO_TYPE_P (BINFO_TYPE (here
), BINFO_TYPE (binfo
)));
2542 gcc_assert (result
);
2547 binfo_for_vbase (tree base
, tree t
)
2551 VEC(tree
,gc
) *vbases
;
2553 for (vbases
= CLASSTYPE_VBASECLASSES (t
), ix
= 0;
2554 VEC_iterate (tree
, vbases
, ix
, binfo
); ix
++)
2555 if (SAME_BINFO_TYPE_P (BINFO_TYPE (binfo
), base
))
2560 /* BINFO is some base binfo of HERE, within some other
2561 hierarchy. Return the equivalent binfo, but in the hierarchy
2562 dominated by HERE. This is the inverse of copied_binfo. If BINFO
2563 is not a base binfo of HERE, returns NULL_TREE. */
2566 original_binfo (tree binfo
, tree here
)
2570 if (SAME_BINFO_TYPE_P (BINFO_TYPE (binfo
), BINFO_TYPE (here
)))
2572 else if (BINFO_VIRTUAL_P (binfo
))
2573 result
= (CLASSTYPE_VBASECLASSES (BINFO_TYPE (here
))
2574 ? binfo_for_vbase (BINFO_TYPE (binfo
), BINFO_TYPE (here
))
2576 else if (BINFO_INHERITANCE_CHAIN (binfo
))
2580 base_binfos
= original_binfo (BINFO_INHERITANCE_CHAIN (binfo
), here
);
2586 for (ix
= 0; (base_binfo
= BINFO_BASE_BINFO (base_binfos
, ix
)); ix
++)
2587 if (SAME_BINFO_TYPE_P (BINFO_TYPE (base_binfo
),
2588 BINFO_TYPE (binfo
)))
2590 result
= base_binfo
;