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 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, 59 Temple Place - Suite 330,
22 Boston, MA 02111-1307, USA. */
24 /* High-level class interface. */
28 #include "coretypes.h"
41 /* The class dominating the hierarchy. */
43 /* A pointer to a complete object of the indicated TYPE. */
48 static int is_subobject_of_p (tree
, tree
);
49 static tree
dfs_check_overlap (tree
, void *);
50 static tree
dfs_no_overlap_yet (tree
, int, void *);
51 static base_kind
lookup_base_r (tree
, tree
, base_access
, bool, tree
*);
52 static int dynamic_cast_base_recurse (tree
, tree
, bool, tree
*);
53 static tree
dfs_debug_unmarkedp (tree
, int, void *);
54 static tree
dfs_debug_mark (tree
, void *);
55 static int check_hidden_convs (tree
, int, int, tree
, tree
, tree
);
56 static tree
split_conversions (tree
, tree
, tree
, tree
);
57 static int lookup_conversions_r (tree
, int, int,
58 tree
, tree
, tree
, tree
, tree
*, tree
*);
59 static int look_for_overrides_r (tree
, tree
);
60 static tree
bfs_walk (tree
, tree (*) (tree
, void *),
61 tree (*) (tree
, int, void *), void *);
62 static tree
lookup_field_queue_p (tree
, int, void *);
63 static int shared_member_p (tree
);
64 static tree
lookup_field_r (tree
, void *);
65 static tree
dfs_accessible_queue_p (tree
, int, void *);
66 static tree
dfs_accessible_p (tree
, void *);
67 static tree
dfs_access_in_type (tree
, void *);
68 static access_kind
access_in_type (tree
, tree
);
69 static int protected_accessible_p (tree
, tree
, tree
);
70 static int friend_accessible_p (tree
, tree
, tree
);
71 static int template_self_reference_p (tree
, tree
);
72 static tree
dfs_get_pure_virtuals (tree
, void *);
75 /* Variables for gathering statistics. */
76 #ifdef GATHER_STATISTICS
77 static int n_fields_searched
;
78 static int n_calls_lookup_field
, n_calls_lookup_field_1
;
79 static int n_calls_lookup_fnfields
, n_calls_lookup_fnfields_1
;
80 static int n_calls_get_base_type
;
81 static int n_outer_fields_searched
;
82 static int n_contexts_saved
;
83 #endif /* GATHER_STATISTICS */
86 /* Worker for lookup_base. BINFO is the binfo we are searching at,
87 BASE is the RECORD_TYPE we are searching for. ACCESS is the
88 required access checks. IS_VIRTUAL indicates if BINFO is morally
91 If BINFO is of the required type, then *BINFO_PTR is examined to
92 compare with any other instance of BASE we might have already
93 discovered. *BINFO_PTR is initialized and a base_kind return value
94 indicates what kind of base was located.
96 Otherwise BINFO's bases are searched. */
99 lookup_base_r (tree binfo
, tree base
, base_access access
,
100 bool is_virtual
, /* inside a virtual part */
105 base_kind found
= bk_not_base
;
107 if (same_type_p (BINFO_TYPE (binfo
), base
))
109 /* We have found a base. Check against what we have found
111 found
= bk_same_type
;
113 found
= bk_via_virtual
;
117 else if (binfo
!= *binfo_ptr
)
119 if (access
!= ba_any
)
121 else if (!is_virtual
)
122 /* Prefer a non-virtual base. */
130 for (i
= 0; BINFO_BASE_ITERATE (binfo
, i
, base_binfo
); i
++)
134 bk
= lookup_base_r (base_binfo
, base
,
136 is_virtual
|| BINFO_VIRTUAL_P (base_binfo
),
142 if (access
!= ba_any
)
151 gcc_assert (found
== bk_not_base
);
156 if (found
!= bk_ambig
)
170 /* Returns true if type BASE is accessible in T. (BASE is known to be
171 a (possibly non-proper) base class of T.) */
174 accessible_base_p (tree t
, tree base
)
178 /* [class.access.base]
180 A base class is said to be accessible if an invented public
181 member of the base class is accessible.
183 If BASE is a non-proper base, this condition is trivially
185 if (same_type_p (t
, base
))
187 /* Rather than inventing a public member, we use the implicit
188 public typedef created in the scope of every class. */
189 decl
= TYPE_FIELDS (base
);
190 while (!DECL_SELF_REFERENCE_P (decl
))
191 decl
= TREE_CHAIN (decl
);
192 while (ANON_AGGR_TYPE_P (t
))
193 t
= TYPE_CONTEXT (t
);
194 return accessible_p (t
, decl
);
197 /* Lookup BASE in the hierarchy dominated by T. Do access checking as
198 ACCESS specifies. Return the binfo we discover. If KIND_PTR is
199 non-NULL, fill with information about what kind of base we
202 If the base is inaccessible, or ambiguous, and the ba_quiet bit is
203 not set in ACCESS, then an error is issued and error_mark_node is
204 returned. If the ba_quiet bit is set, then no error is issued and
205 NULL_TREE is returned. */
208 lookup_base (tree t
, tree base
, base_access access
, base_kind
*kind_ptr
)
210 tree binfo
= NULL_TREE
; /* The binfo we've found so far. */
211 tree t_binfo
= NULL_TREE
;
214 if (t
== error_mark_node
|| base
== error_mark_node
)
217 *kind_ptr
= bk_not_base
;
218 return error_mark_node
;
220 gcc_assert (TYPE_P (base
));
229 t
= complete_type (TYPE_MAIN_VARIANT (t
));
230 t_binfo
= TYPE_BINFO (t
);
233 base
= complete_type (TYPE_MAIN_VARIANT (base
));
236 bk
= lookup_base_r (t_binfo
, base
, access
, 0, &binfo
);
240 /* Check that the base is unambiguous and accessible. */
241 if (access
!= ba_any
)
249 if (!(access
& ba_quiet
))
251 error ("`%T' is an ambiguous base of `%T'", base
, t
);
252 binfo
= error_mark_node
;
257 if ((access
& ~ba_quiet
) != ba_ignore
258 /* If BASE is incomplete, then BASE and TYPE are probably
259 the same, in which case BASE is accessible. If they
260 are not the same, then TYPE is invalid. In that case,
261 there's no need to issue another error here, and
262 there's no implicit typedef to use in the code that
263 follows, so we skip the check. */
264 && COMPLETE_TYPE_P (base
)
265 && !accessible_base_p (t
, base
))
267 if (!(access
& ba_quiet
))
269 error ("`%T' is an inaccessible base of `%T'", base
, t
);
270 binfo
= error_mark_node
;
274 bk
= bk_inaccessible
;
285 /* Worker function for get_dynamic_cast_base_type. */
288 dynamic_cast_base_recurse (tree subtype
, tree binfo
, bool is_via_virtual
,
291 VEC (tree
) *accesses
;
296 if (BINFO_TYPE (binfo
) == subtype
)
302 *offset_ptr
= BINFO_OFFSET (binfo
);
307 accesses
= BINFO_BASE_ACCESSES (binfo
);
308 for (i
= 0; BINFO_BASE_ITERATE (binfo
, i
, base_binfo
); i
++)
310 tree base_access
= VEC_index (tree
, accesses
, i
);
313 if (base_access
!= access_public_node
)
315 rval
= dynamic_cast_base_recurse
316 (subtype
, base_binfo
,
317 is_via_virtual
|| BINFO_VIRTUAL_P (base_binfo
), offset_ptr
);
321 worst
= worst
>= 0 ? -3 : worst
;
324 else if (rval
== -3 && worst
!= -1)
330 /* The dynamic cast runtime needs a hint about how the static SUBTYPE type
331 started from is related to the required TARGET type, in order to optimize
332 the inheritance graph search. This information is independent of the
333 current context, and ignores private paths, hence get_base_distance is
334 inappropriate. Return a TREE specifying the base offset, BOFF.
335 BOFF >= 0, there is only one public non-virtual SUBTYPE base at offset BOFF,
336 and there are no public virtual SUBTYPE bases.
337 BOFF == -1, SUBTYPE occurs as multiple public virtual or non-virtual bases.
338 BOFF == -2, SUBTYPE is not a public base.
339 BOFF == -3, SUBTYPE occurs as multiple public non-virtual bases. */
342 get_dynamic_cast_base_type (tree subtype
, tree target
)
344 tree offset
= NULL_TREE
;
345 int boff
= dynamic_cast_base_recurse (subtype
, TYPE_BINFO (target
),
350 offset
= ssize_int (boff
);
354 /* Search for a member with name NAME in a multiple inheritance
355 lattice specified by TYPE. If it does not exist, return NULL_TREE.
356 If the member is ambiguously referenced, return `error_mark_node'.
357 Otherwise, return a DECL with the indicated name. If WANT_TYPE is
358 true, type declarations are preferred. */
360 /* Do a 1-level search for NAME as a member of TYPE. The caller must
361 figure out whether it can access this field. (Since it is only one
362 level, this is reasonable.) */
365 lookup_field_1 (tree type
, tree name
, bool want_type
)
369 if (TREE_CODE (type
) == TEMPLATE_TYPE_PARM
370 || TREE_CODE (type
) == BOUND_TEMPLATE_TEMPLATE_PARM
371 || TREE_CODE (type
) == TYPENAME_TYPE
)
372 /* The TYPE_FIELDS of a TEMPLATE_TYPE_PARM and
373 BOUND_TEMPLATE_TEMPLATE_PARM are not fields at all;
374 instead TYPE_FIELDS is the TEMPLATE_PARM_INDEX. (Miraculously,
375 the code often worked even when we treated the index as a list
377 The TYPE_FIELDS of TYPENAME_TYPE is its TYPENAME_TYPE_FULLNAME. */
381 && DECL_LANG_SPECIFIC (TYPE_NAME (type
))
382 && DECL_SORTED_FIELDS (TYPE_NAME (type
)))
384 tree
*fields
= &DECL_SORTED_FIELDS (TYPE_NAME (type
))->elts
[0];
385 int lo
= 0, hi
= DECL_SORTED_FIELDS (TYPE_NAME (type
))->len
;
392 #ifdef GATHER_STATISTICS
394 #endif /* GATHER_STATISTICS */
396 if (DECL_NAME (fields
[i
]) > name
)
398 else if (DECL_NAME (fields
[i
]) < name
)
404 /* We might have a nested class and a field with the
405 same name; we sorted them appropriately via
406 field_decl_cmp, so just look for the first or last
407 field with this name. */
412 while (i
>= lo
&& DECL_NAME (fields
[i
]) == name
);
413 if (TREE_CODE (field
) != TYPE_DECL
414 && !DECL_CLASS_TEMPLATE_P (field
))
421 while (i
< hi
&& DECL_NAME (fields
[i
]) == name
);
429 field
= TYPE_FIELDS (type
);
431 #ifdef GATHER_STATISTICS
432 n_calls_lookup_field_1
++;
433 #endif /* GATHER_STATISTICS */
434 for (field
= TYPE_FIELDS (type
); field
; field
= TREE_CHAIN (field
))
436 #ifdef GATHER_STATISTICS
438 #endif /* GATHER_STATISTICS */
439 gcc_assert (DECL_P (field
));
440 if (DECL_NAME (field
) == NULL_TREE
441 && ANON_AGGR_TYPE_P (TREE_TYPE (field
)))
443 tree temp
= lookup_field_1 (TREE_TYPE (field
), name
, want_type
);
447 if (TREE_CODE (field
) == USING_DECL
)
449 /* We generally treat class-scope using-declarations as
450 ARM-style access specifications, because support for the
451 ISO semantics has not been implemented. So, in general,
452 there's no reason to return a USING_DECL, and the rest of
453 the compiler cannot handle that. Once the class is
454 defined, USING_DECLs are purged from TYPE_FIELDS; see
455 handle_using_decl. However, we make special efforts to
456 make using-declarations in template classes work
458 if (CLASSTYPE_TEMPLATE_INFO (type
)
459 && !CLASSTYPE_USE_TEMPLATE (type
)
460 && !TREE_TYPE (field
))
466 if (DECL_NAME (field
) == name
468 || TREE_CODE (field
) == TYPE_DECL
469 || DECL_CLASS_TEMPLATE_P (field
)))
473 if (name
== vptr_identifier
)
475 /* Give the user what s/he thinks s/he wants. */
476 if (TYPE_POLYMORPHIC_P (type
))
477 return TYPE_VFIELD (type
);
482 /* There are a number of cases we need to be aware of here:
483 current_class_type current_function_decl
490 Those last two make life interesting. If we're in a function which is
491 itself inside a class, we need decls to go into the fn's decls (our
492 second case below). But if we're in a class and the class itself is
493 inside a function, we need decls to go into the decls for the class. To
494 achieve this last goal, we must see if, when both current_class_ptr and
495 current_function_decl are set, the class was declared inside that
496 function. If so, we know to put the decls into the class's scope. */
501 if (current_function_decl
== NULL_TREE
)
502 return current_class_type
;
503 if (current_class_type
== NULL_TREE
)
504 return current_function_decl
;
505 if ((DECL_FUNCTION_MEMBER_P (current_function_decl
)
506 && same_type_p (DECL_CONTEXT (current_function_decl
),
508 || (DECL_FRIEND_CONTEXT (current_function_decl
)
509 && same_type_p (DECL_FRIEND_CONTEXT (current_function_decl
),
510 current_class_type
)))
511 return current_function_decl
;
513 return current_class_type
;
516 /* Returns nonzero if we are currently in a function scope. Note
517 that this function returns zero if we are within a local class, but
518 not within a member function body of the local class. */
521 at_function_scope_p (void)
523 tree cs
= current_scope ();
524 return cs
&& TREE_CODE (cs
) == FUNCTION_DECL
;
527 /* Returns true if the innermost active scope is a class scope. */
530 at_class_scope_p (void)
532 tree cs
= current_scope ();
533 return cs
&& TYPE_P (cs
);
536 /* Returns true if the innermost active scope is a namespace scope. */
539 at_namespace_scope_p (void)
541 /* We are in a namespace scope if we are not it a class scope or a
543 return !current_scope();
546 /* Return the scope of DECL, as appropriate when doing name-lookup. */
549 context_for_name_lookup (tree decl
)
553 For the purposes of name lookup, after the anonymous union
554 definition, the members of the anonymous union are considered to
555 have been defined in the scope in which the anonymous union is
557 tree context
= DECL_CONTEXT (decl
);
559 while (context
&& TYPE_P (context
) && ANON_AGGR_TYPE_P (context
))
560 context
= TYPE_CONTEXT (context
);
562 context
= global_namespace
;
567 /* The accessibility routines use BINFO_ACCESS for scratch space
568 during the computation of the accessibility of some declaration. */
570 #define BINFO_ACCESS(NODE) \
571 ((access_kind) ((TREE_PUBLIC (NODE) << 1) | TREE_PRIVATE (NODE)))
573 /* Set the access associated with NODE to ACCESS. */
575 #define SET_BINFO_ACCESS(NODE, ACCESS) \
576 ((TREE_PUBLIC (NODE) = ((ACCESS) & 2) != 0), \
577 (TREE_PRIVATE (NODE) = ((ACCESS) & 1) != 0))
579 /* Called from access_in_type via dfs_walk. Calculate the access to
580 DATA (which is really a DECL) in BINFO. */
583 dfs_access_in_type (tree binfo
, void *data
)
585 tree decl
= (tree
) data
;
586 tree type
= BINFO_TYPE (binfo
);
587 access_kind access
= ak_none
;
589 if (context_for_name_lookup (decl
) == type
)
591 /* If we have descended to the scope of DECL, just note the
592 appropriate access. */
593 if (TREE_PRIVATE (decl
))
595 else if (TREE_PROTECTED (decl
))
596 access
= ak_protected
;
602 /* First, check for an access-declaration that gives us more
603 access to the DECL. The CONST_DECL for an enumeration
604 constant will not have DECL_LANG_SPECIFIC, and thus no
606 if (DECL_LANG_SPECIFIC (decl
) && !DECL_DISCRIMINATOR_P (decl
))
608 tree decl_access
= purpose_member (type
, DECL_ACCESS (decl
));
612 decl_access
= TREE_VALUE (decl_access
);
614 if (decl_access
== access_public_node
)
616 else if (decl_access
== access_protected_node
)
617 access
= ak_protected
;
618 else if (decl_access
== access_private_node
)
629 VEC (tree
) *accesses
;
631 /* Otherwise, scan our baseclasses, and pick the most favorable
633 accesses
= BINFO_BASE_ACCESSES (binfo
);
634 for (i
= 0; BINFO_BASE_ITERATE (binfo
, i
, base_binfo
); i
++)
636 tree base_access
= VEC_index (tree
, accesses
, i
);
637 access_kind base_access_now
= BINFO_ACCESS (base_binfo
);
639 if (base_access_now
== ak_none
|| base_access_now
== ak_private
)
640 /* If it was not accessible in the base, or only
641 accessible as a private member, we can't access it
643 base_access_now
= ak_none
;
644 else if (base_access
== access_protected_node
)
645 /* Public and protected members in the base become
647 base_access_now
= ak_protected
;
648 else if (base_access
== access_private_node
)
649 /* Public and protected members in the base become
651 base_access_now
= ak_private
;
653 /* See if the new access, via this base, gives more
654 access than our previous best access. */
655 if (base_access_now
!= ak_none
656 && (access
== ak_none
|| base_access_now
< access
))
658 access
= base_access_now
;
660 /* If the new access is public, we can't do better. */
661 if (access
== ak_public
)
668 /* Note the access to DECL in TYPE. */
669 SET_BINFO_ACCESS (binfo
, access
);
671 /* Mark TYPE as visited so that if we reach it again we do not
672 duplicate our efforts here. */
673 BINFO_MARKED (binfo
) = 1;
678 /* Return the access to DECL in TYPE. */
681 access_in_type (tree type
, tree decl
)
683 tree binfo
= TYPE_BINFO (type
);
685 /* We must take into account
689 If a name can be reached by several paths through a multiple
690 inheritance graph, the access is that of the path that gives
693 The algorithm we use is to make a post-order depth-first traversal
694 of the base-class hierarchy. As we come up the tree, we annotate
695 each node with the most lenient access. */
696 dfs_walk_real (binfo
, 0, dfs_access_in_type
, unmarkedp
, decl
);
697 dfs_walk (binfo
, dfs_unmark
, markedp
, 0);
699 return BINFO_ACCESS (binfo
);
702 /* Called from accessible_p via dfs_walk. */
705 dfs_accessible_queue_p (tree derived
, int ix
, void *data ATTRIBUTE_UNUSED
)
707 tree binfo
= BINFO_BASE_BINFO (derived
, ix
);
709 if (BINFO_MARKED (binfo
))
712 /* If this class is inherited via private or protected inheritance,
713 then we can't see it, unless we are a friend of the derived class. */
714 if (BINFO_BASE_ACCESS (derived
, ix
) != access_public_node
715 && !is_friend (BINFO_TYPE (derived
), current_scope ()))
721 /* Called from accessible_p via dfs_walk. */
724 dfs_accessible_p (tree binfo
, void *data ATTRIBUTE_UNUSED
)
728 BINFO_MARKED (binfo
) = 1;
729 access
= BINFO_ACCESS (binfo
);
730 if (access
!= ak_none
731 && is_friend (BINFO_TYPE (binfo
), current_scope ()))
737 /* Returns nonzero if it is OK to access DECL through an object
738 indicated by BINFO in the context of DERIVED. */
741 protected_accessible_p (tree decl
, tree derived
, tree binfo
)
745 /* We're checking this clause from [class.access.base]
747 m as a member of N is protected, and the reference occurs in a
748 member or friend of class N, or in a member or friend of a
749 class P derived from N, where m as a member of P is private or
752 Here DERIVED is a possible P and DECL is m. accessible_p will
753 iterate over various values of N, but the access to m in DERIVED
756 Note that I believe that the passage above is wrong, and should read
757 "...is private or protected or public"; otherwise you get bizarre results
758 whereby a public using-decl can prevent you from accessing a protected
759 member of a base. (jason 2000/02/28) */
761 /* If DERIVED isn't derived from m's class, then it can't be a P. */
762 if (!DERIVED_FROM_P (context_for_name_lookup (decl
), derived
))
765 access
= access_in_type (derived
, decl
);
767 /* If m is inaccessible in DERIVED, then it's not a P. */
768 if (access
== ak_none
)
773 When a friend or a member function of a derived class references
774 a protected nonstatic member of a base class, an access check
775 applies in addition to those described earlier in clause
776 _class.access_) Except when forming a pointer to member
777 (_expr.unary.op_), the access must be through a pointer to,
778 reference to, or object of the derived class itself (or any class
779 derived from that class) (_expr.ref_). If the access is to form
780 a pointer to member, the nested-name-specifier shall name the
781 derived class (or any class derived from that class). */
782 if (DECL_NONSTATIC_MEMBER_P (decl
))
784 /* We can tell through what the reference is occurring by
785 chasing BINFO up to the root. */
787 while (BINFO_INHERITANCE_CHAIN (t
))
788 t
= BINFO_INHERITANCE_CHAIN (t
);
790 if (!DERIVED_FROM_P (derived
, BINFO_TYPE (t
)))
797 /* Returns nonzero if SCOPE is a friend of a type which would be able
798 to access DECL through the object indicated by BINFO. */
801 friend_accessible_p (tree scope
, tree decl
, tree binfo
)
803 tree befriending_classes
;
809 if (TREE_CODE (scope
) == FUNCTION_DECL
810 || DECL_FUNCTION_TEMPLATE_P (scope
))
811 befriending_classes
= DECL_BEFRIENDING_CLASSES (scope
);
812 else if (TYPE_P (scope
))
813 befriending_classes
= CLASSTYPE_BEFRIENDING_CLASSES (scope
);
817 for (t
= befriending_classes
; t
; t
= TREE_CHAIN (t
))
818 if (protected_accessible_p (decl
, TREE_VALUE (t
), binfo
))
821 /* Nested classes are implicitly friends of their enclosing types, as
822 per core issue 45 (this is a change from the standard). */
824 for (t
= TYPE_CONTEXT (scope
); t
&& TYPE_P (t
); t
= TYPE_CONTEXT (t
))
825 if (protected_accessible_p (decl
, t
, binfo
))
828 if (TREE_CODE (scope
) == FUNCTION_DECL
829 || DECL_FUNCTION_TEMPLATE_P (scope
))
831 /* Perhaps this SCOPE is a member of a class which is a
833 if (DECL_CLASS_SCOPE_P (decl
)
834 && friend_accessible_p (DECL_CONTEXT (scope
), decl
, binfo
))
837 /* Or an instantiation of something which is a friend. */
838 if (DECL_TEMPLATE_INFO (scope
))
841 /* Increment processing_template_decl to make sure that
842 dependent_type_p works correctly. */
843 ++processing_template_decl
;
844 ret
= friend_accessible_p (DECL_TI_TEMPLATE (scope
), decl
, binfo
);
845 --processing_template_decl
;
849 else if (CLASSTYPE_TEMPLATE_INFO (scope
))
852 /* Increment processing_template_decl to make sure that
853 dependent_type_p works correctly. */
854 ++processing_template_decl
;
855 ret
= friend_accessible_p (CLASSTYPE_TI_TEMPLATE (scope
), decl
, binfo
);
856 --processing_template_decl
;
863 /* DECL is a declaration from a base class of TYPE, which was the
864 class used to name DECL. Return nonzero if, in the current
865 context, DECL is accessible. If TYPE is actually a BINFO node,
866 then we can tell in what context the access is occurring by looking
867 at the most derived class along the path indicated by BINFO. */
870 accessible_p (tree type
, tree decl
)
877 /* Nonzero if it's OK to access DECL if it has protected
878 accessibility in TYPE. */
879 int protected_ok
= 0;
881 /* If this declaration is in a block or namespace scope, there's no
883 if (!TYPE_P (context_for_name_lookup (decl
)))
886 /* There is no need to perform access checks inside a thunk. */
887 scope
= current_scope ();
888 if (scope
&& DECL_THUNK_P (scope
))
891 /* In a template declaration, we cannot be sure whether the
892 particular specialization that is instantiated will be a friend
893 or not. Therefore, all access checks are deferred until
895 if (processing_template_decl
)
901 type
= BINFO_TYPE (type
);
904 binfo
= TYPE_BINFO (type
);
906 /* [class.access.base]
908 A member m is accessible when named in class N if
910 --m as a member of N is public, or
912 --m as a member of N is private, and the reference occurs in a
913 member or friend of class N, or
915 --m as a member of N is protected, and the reference occurs in a
916 member or friend of class N, or in a member or friend of a
917 class P derived from N, where m as a member of P is private or
920 --there exists a base class B of N that is accessible at the point
921 of reference, and m is accessible when named in class B.
923 We walk the base class hierarchy, checking these conditions. */
925 /* Figure out where the reference is occurring. Check to see if
926 DECL is private or protected in this scope, since that will
927 determine whether protected access is allowed. */
928 if (current_class_type
)
929 protected_ok
= protected_accessible_p (decl
, current_class_type
, binfo
);
931 /* Now, loop through the classes of which we are a friend. */
933 protected_ok
= friend_accessible_p (scope
, decl
, binfo
);
935 /* Standardize the binfo that access_in_type will use. We don't
936 need to know what path was chosen from this point onwards. */
937 binfo
= TYPE_BINFO (type
);
939 /* Compute the accessibility of DECL in the class hierarchy
940 dominated by type. */
941 access
= access_in_type (type
, decl
);
942 if (access
== ak_public
943 || (access
== ak_protected
&& protected_ok
))
947 /* Walk the hierarchy again, looking for a base class that allows
949 t
= dfs_walk (binfo
, dfs_accessible_p
, dfs_accessible_queue_p
, 0);
950 /* Clear any mark bits. Note that we have to walk the whole tree
951 here, since we have aborted the previous walk from some point
953 dfs_walk (binfo
, dfs_unmark
, 0, 0);
955 return t
!= NULL_TREE
;
959 struct lookup_field_info
{
960 /* The type in which we're looking. */
962 /* The name of the field for which we're looking. */
964 /* If non-NULL, the current result of the lookup. */
966 /* The path to RVAL. */
968 /* If non-NULL, the lookup was ambiguous, and this is a list of the
971 /* If nonzero, we are looking for types, not data members. */
973 /* If something went wrong, a message indicating what. */
977 /* Returns nonzero if BINFO is not hidden by the value found by the
978 lookup so far. If BINFO is hidden, then there's no need to look in
979 it. DATA is really a struct lookup_field_info. Called from
980 lookup_field via breadth_first_search. */
983 lookup_field_queue_p (tree derived
, int ix
, void *data
)
985 tree binfo
= BINFO_BASE_BINFO (derived
, ix
);
986 struct lookup_field_info
*lfi
= (struct lookup_field_info
*) data
;
988 /* Don't look for constructors or destructors in base classes. */
989 if (IDENTIFIER_CTOR_OR_DTOR_P (lfi
->name
))
992 /* If this base class is hidden by the best-known value so far, we
993 don't need to look. */
994 if (lfi
->rval_binfo
&& original_binfo (binfo
, lfi
->rval_binfo
))
997 /* If this is a dependent base, don't look in it. */
998 if (BINFO_DEPENDENT_BASE_P (binfo
))
1004 /* Within the scope of a template class, you can refer to the to the
1005 current specialization with the name of the template itself. For
1008 template <typename T> struct S { S* sp; }
1010 Returns nonzero if DECL is such a declaration in a class TYPE. */
1013 template_self_reference_p (tree type
, tree decl
)
1015 return (CLASSTYPE_USE_TEMPLATE (type
)
1016 && PRIMARY_TEMPLATE_P (CLASSTYPE_TI_TEMPLATE (type
))
1017 && TREE_CODE (decl
) == TYPE_DECL
1018 && DECL_ARTIFICIAL (decl
)
1019 && DECL_NAME (decl
) == constructor_name (type
));
1022 /* Nonzero for a class member means that it is shared between all objects
1025 [class.member.lookup]:If the resulting set of declarations are not all
1026 from sub-objects of the same type, or the set has a nonstatic member
1027 and includes members from distinct sub-objects, there is an ambiguity
1028 and the program is ill-formed.
1030 This function checks that T contains no nonstatic members. */
1033 shared_member_p (tree t
)
1035 if (TREE_CODE (t
) == VAR_DECL
|| TREE_CODE (t
) == TYPE_DECL \
1036 || TREE_CODE (t
) == CONST_DECL
)
1038 if (is_overloaded_fn (t
))
1040 for (; t
; t
= OVL_NEXT (t
))
1042 tree fn
= OVL_CURRENT (t
);
1043 if (DECL_NONSTATIC_MEMBER_FUNCTION_P (fn
))
1051 /* Routine to see if the sub-object denoted by the binfo PARENT can be
1052 found as a base class and sub-object of the object denoted by
1056 is_subobject_of_p (tree parent
, tree binfo
)
1060 for (probe
= parent
; probe
; probe
= BINFO_INHERITANCE_CHAIN (probe
))
1064 if (BINFO_VIRTUAL_P (probe
))
1065 return (binfo_for_vbase (BINFO_TYPE (probe
), BINFO_TYPE (binfo
))
1071 /* DATA is really a struct lookup_field_info. Look for a field with
1072 the name indicated there in BINFO. If this function returns a
1073 non-NULL value it is the result of the lookup. Called from
1074 lookup_field via breadth_first_search. */
1077 lookup_field_r (tree binfo
, void *data
)
1079 struct lookup_field_info
*lfi
= (struct lookup_field_info
*) data
;
1080 tree type
= BINFO_TYPE (binfo
);
1081 tree nval
= NULL_TREE
;
1083 /* First, look for a function. There can't be a function and a data
1084 member with the same name, and if there's a function and a type
1085 with the same name, the type is hidden by the function. */
1086 if (!lfi
->want_type
)
1088 int idx
= lookup_fnfields_1 (type
, lfi
->name
);
1090 nval
= VEC_index (tree
, CLASSTYPE_METHOD_VEC (type
), idx
);
1094 /* Look for a data member or type. */
1095 nval
= lookup_field_1 (type
, lfi
->name
, lfi
->want_type
);
1097 /* If there is no declaration with the indicated name in this type,
1098 then there's nothing to do. */
1102 /* If we're looking up a type (as with an elaborated type specifier)
1103 we ignore all non-types we find. */
1104 if (lfi
->want_type
&& TREE_CODE (nval
) != TYPE_DECL
1105 && !DECL_CLASS_TEMPLATE_P (nval
))
1107 if (lfi
->name
== TYPE_IDENTIFIER (type
))
1109 /* If the aggregate has no user defined constructors, we allow
1110 it to have fields with the same name as the enclosing type.
1111 If we are looking for that name, find the corresponding
1113 for (nval
= TREE_CHAIN (nval
); nval
; nval
= TREE_CHAIN (nval
))
1114 if (DECL_NAME (nval
) == lfi
->name
1115 && TREE_CODE (nval
) == TYPE_DECL
)
1120 if (!nval
&& CLASSTYPE_NESTED_UTDS (type
) != NULL
)
1122 binding_entry e
= binding_table_find (CLASSTYPE_NESTED_UTDS (type
),
1125 nval
= TYPE_MAIN_DECL (e
->type
);
1131 /* You must name a template base class with a template-id. */
1132 if (!same_type_p (type
, lfi
->type
)
1133 && template_self_reference_p (type
, nval
))
1136 /* If the lookup already found a match, and the new value doesn't
1137 hide the old one, we might have an ambiguity. */
1139 && !is_subobject_of_p (lfi
->rval_binfo
, binfo
))
1142 if (nval
== lfi
->rval
&& shared_member_p (nval
))
1143 /* The two things are really the same. */
1145 else if (is_subobject_of_p (binfo
, lfi
->rval_binfo
))
1146 /* The previous value hides the new one. */
1150 /* We have a real ambiguity. We keep a chain of all the
1152 if (!lfi
->ambiguous
&& lfi
->rval
)
1154 /* This is the first time we noticed an ambiguity. Add
1155 what we previously thought was a reasonable candidate
1157 lfi
->ambiguous
= tree_cons (NULL_TREE
, lfi
->rval
, NULL_TREE
);
1158 TREE_TYPE (lfi
->ambiguous
) = error_mark_node
;
1161 /* Add the new value. */
1162 lfi
->ambiguous
= tree_cons (NULL_TREE
, nval
, lfi
->ambiguous
);
1163 TREE_TYPE (lfi
->ambiguous
) = error_mark_node
;
1164 lfi
->errstr
= "request for member `%D' is ambiguous";
1170 lfi
->rval_binfo
= binfo
;
1176 /* Return a "baselink" with BASELINK_BINFO, BASELINK_ACCESS_BINFO,
1177 BASELINK_FUNCTIONS, and BASELINK_OPTYPE set to BINFO, ACCESS_BINFO,
1178 FUNCTIONS, and OPTYPE respectively. */
1181 build_baselink (tree binfo
, tree access_binfo
, tree functions
, tree optype
)
1185 gcc_assert (TREE_CODE (functions
) == FUNCTION_DECL
1186 || TREE_CODE (functions
) == TEMPLATE_DECL
1187 || TREE_CODE (functions
) == TEMPLATE_ID_EXPR
1188 || TREE_CODE (functions
) == OVERLOAD
);
1189 gcc_assert (!optype
|| TYPE_P (optype
));
1190 gcc_assert (TREE_TYPE (functions
));
1192 baselink
= make_node (BASELINK
);
1193 TREE_TYPE (baselink
) = TREE_TYPE (functions
);
1194 BASELINK_BINFO (baselink
) = binfo
;
1195 BASELINK_ACCESS_BINFO (baselink
) = access_binfo
;
1196 BASELINK_FUNCTIONS (baselink
) = functions
;
1197 BASELINK_OPTYPE (baselink
) = optype
;
1202 /* Look for a member named NAME in an inheritance lattice dominated by
1203 XBASETYPE. If PROTECT is 0 or two, we do not check access. If it
1204 is 1, we enforce accessibility. If PROTECT is zero, then, for an
1205 ambiguous lookup, we return NULL. If PROTECT is 1, we issue error
1206 messages about inaccessible or ambiguous lookup. If PROTECT is 2,
1207 we return a TREE_LIST whose TREE_TYPE is error_mark_node and whose
1208 TREE_VALUEs are the list of ambiguous candidates.
1210 WANT_TYPE is 1 when we should only return TYPE_DECLs.
1212 If nothing can be found return NULL_TREE and do not issue an error. */
1215 lookup_member (tree xbasetype
, tree name
, int protect
, bool want_type
)
1217 tree rval
, rval_binfo
= NULL_TREE
;
1218 tree type
= NULL_TREE
, basetype_path
= NULL_TREE
;
1219 struct lookup_field_info lfi
;
1221 /* rval_binfo is the binfo associated with the found member, note,
1222 this can be set with useful information, even when rval is not
1223 set, because it must deal with ALL members, not just non-function
1224 members. It is used for ambiguity checking and the hidden
1225 checks. Whereas rval is only set if a proper (not hidden)
1226 non-function member is found. */
1228 const char *errstr
= 0;
1230 gcc_assert (TREE_CODE (name
) == IDENTIFIER_NODE
);
1232 if (TREE_CODE (xbasetype
) == TREE_BINFO
)
1234 type
= BINFO_TYPE (xbasetype
);
1235 basetype_path
= xbasetype
;
1239 gcc_assert (IS_AGGR_TYPE_CODE (TREE_CODE (xbasetype
)));
1241 xbasetype
= NULL_TREE
;
1244 type
= complete_type (type
);
1246 basetype_path
= TYPE_BINFO (type
);
1251 #ifdef GATHER_STATISTICS
1252 n_calls_lookup_field
++;
1253 #endif /* GATHER_STATISTICS */
1255 memset (&lfi
, 0, sizeof (lfi
));
1258 lfi
.want_type
= want_type
;
1259 bfs_walk (basetype_path
, &lookup_field_r
, &lookup_field_queue_p
, &lfi
);
1261 rval_binfo
= lfi
.rval_binfo
;
1263 type
= BINFO_TYPE (rval_binfo
);
1264 errstr
= lfi
.errstr
;
1266 /* If we are not interested in ambiguities, don't report them;
1267 just return NULL_TREE. */
1268 if (!protect
&& lfi
.ambiguous
)
1274 return lfi
.ambiguous
;
1281 In the case of overloaded function names, access control is
1282 applied to the function selected by overloaded resolution. */
1283 if (rval
&& protect
&& !is_overloaded_fn (rval
))
1284 perform_or_defer_access_check (basetype_path
, rval
);
1286 if (errstr
&& protect
)
1288 error (errstr
, name
, type
);
1290 print_candidates (lfi
.ambiguous
);
1291 rval
= error_mark_node
;
1294 if (rval
&& is_overloaded_fn (rval
))
1295 rval
= build_baselink (rval_binfo
, basetype_path
, rval
,
1296 (IDENTIFIER_TYPENAME_P (name
)
1297 ? TREE_TYPE (name
): NULL_TREE
));
1301 /* Like lookup_member, except that if we find a function member we
1302 return NULL_TREE. */
1305 lookup_field (tree xbasetype
, tree name
, int protect
, bool want_type
)
1307 tree rval
= lookup_member (xbasetype
, name
, protect
, want_type
);
1309 /* Ignore functions, but propagate the ambiguity list. */
1310 if (!error_operand_p (rval
)
1311 && (rval
&& BASELINK_P (rval
)))
1317 /* Like lookup_member, except that if we find a non-function member we
1318 return NULL_TREE. */
1321 lookup_fnfields (tree xbasetype
, tree name
, int protect
)
1323 tree rval
= lookup_member (xbasetype
, name
, protect
, /*want_type=*/false);
1325 /* Ignore non-functions, but propagate the ambiguity list. */
1326 if (!error_operand_p (rval
)
1327 && (rval
&& !BASELINK_P (rval
)))
1333 /* Return the index in the CLASSTYPE_METHOD_VEC for CLASS_TYPE
1334 corresponding to "operator TYPE ()", or -1 if there is no such
1335 operator. Only CLASS_TYPE itself is searched; this routine does
1336 not scan the base classes of CLASS_TYPE. */
1339 lookup_conversion_operator (tree class_type
, tree type
)
1343 if (TYPE_HAS_CONVERSION (class_type
))
1347 VEC(tree
) *methods
= CLASSTYPE_METHOD_VEC (class_type
);
1349 for (i
= CLASSTYPE_FIRST_CONVERSION_SLOT
;
1350 VEC_iterate (tree
, methods
, i
, fn
); ++i
)
1352 /* All the conversion operators come near the beginning of
1353 the class. Therefore, if FN is not a conversion
1354 operator, there is no matching conversion operator in
1356 fn
= OVL_CURRENT (fn
);
1357 if (!DECL_CONV_FN_P (fn
))
1360 if (TREE_CODE (fn
) == TEMPLATE_DECL
)
1361 /* All the templated conversion functions are on the same
1362 slot, so remember it. */
1364 else if (same_type_p (DECL_CONV_FN_TYPE (fn
), type
))
1372 /* TYPE is a class type. Return the index of the fields within
1373 the method vector with name NAME, or -1 is no such field exists. */
1376 lookup_fnfields_1 (tree type
, tree name
)
1378 VEC(tree
) *method_vec
;
1383 if (!CLASS_TYPE_P (type
))
1386 if (COMPLETE_TYPE_P (type
))
1388 if ((name
== ctor_identifier
1389 || name
== base_ctor_identifier
1390 || name
== complete_ctor_identifier
))
1392 if (CLASSTYPE_LAZY_DEFAULT_CTOR (type
))
1393 lazily_declare_fn (sfk_constructor
, type
);
1394 if (CLASSTYPE_LAZY_COPY_CTOR (type
))
1395 lazily_declare_fn (sfk_copy_constructor
, type
);
1397 else if (name
== ansi_assopname(NOP_EXPR
)
1398 && CLASSTYPE_LAZY_ASSIGNMENT_OP (type
))
1399 lazily_declare_fn (sfk_assignment_operator
, type
);
1402 method_vec
= CLASSTYPE_METHOD_VEC (type
);
1406 #ifdef GATHER_STATISTICS
1407 n_calls_lookup_fnfields_1
++;
1408 #endif /* GATHER_STATISTICS */
1410 /* Constructors are first... */
1411 if (name
== ctor_identifier
)
1413 fn
= CLASSTYPE_CONSTRUCTORS (type
);
1414 return fn
? CLASSTYPE_CONSTRUCTOR_SLOT
: -1;
1416 /* and destructors are second. */
1417 if (name
== dtor_identifier
)
1419 fn
= CLASSTYPE_DESTRUCTORS (type
);
1420 return fn
? CLASSTYPE_DESTRUCTOR_SLOT
: -1;
1422 if (IDENTIFIER_TYPENAME_P (name
))
1423 return lookup_conversion_operator (type
, TREE_TYPE (name
));
1425 /* Skip the conversion operators. */
1426 for (i
= CLASSTYPE_FIRST_CONVERSION_SLOT
;
1427 VEC_iterate (tree
, method_vec
, i
, fn
);
1429 if (!DECL_CONV_FN_P (OVL_CURRENT (fn
)))
1432 /* If the type is complete, use binary search. */
1433 if (COMPLETE_TYPE_P (type
))
1439 hi
= VEC_length (tree
, method_vec
);
1444 #ifdef GATHER_STATISTICS
1445 n_outer_fields_searched
++;
1446 #endif /* GATHER_STATISTICS */
1448 tmp
= VEC_index (tree
, method_vec
, i
);
1449 tmp
= DECL_NAME (OVL_CURRENT (tmp
));
1452 else if (tmp
< name
)
1459 for (; VEC_iterate (tree
, method_vec
, i
, fn
); ++i
)
1461 #ifdef GATHER_STATISTICS
1462 n_outer_fields_searched
++;
1463 #endif /* GATHER_STATISTICS */
1464 if (DECL_NAME (OVL_CURRENT (fn
)) == name
)
1471 /* DECL is the result of a qualified name lookup. QUALIFYING_SCOPE is
1472 the class or namespace used to qualify the name. CONTEXT_CLASS is
1473 the class corresponding to the object in which DECL will be used.
1474 Return a possibly modified version of DECL that takes into account
1477 In particular, consider an expression like `B::m' in the context of
1478 a derived class `D'. If `B::m' has been resolved to a BASELINK,
1479 then the most derived class indicated by the BASELINK_BINFO will be
1480 `B', not `D'. This function makes that adjustment. */
1483 adjust_result_of_qualified_name_lookup (tree decl
,
1484 tree qualifying_scope
,
1487 if (context_class
&& CLASS_TYPE_P (qualifying_scope
)
1488 && DERIVED_FROM_P (qualifying_scope
, context_class
)
1489 && BASELINK_P (decl
))
1493 gcc_assert (CLASS_TYPE_P (context_class
));
1495 /* Look for the QUALIFYING_SCOPE as a base of the CONTEXT_CLASS.
1496 Because we do not yet know which function will be chosen by
1497 overload resolution, we cannot yet check either accessibility
1498 or ambiguity -- in either case, the choice of a static member
1499 function might make the usage valid. */
1500 base
= lookup_base (context_class
, qualifying_scope
,
1501 ba_ignore
| ba_quiet
, NULL
);
1504 BASELINK_ACCESS_BINFO (decl
) = base
;
1505 BASELINK_BINFO (decl
)
1506 = lookup_base (base
, BINFO_TYPE (BASELINK_BINFO (decl
)),
1507 ba_ignore
| ba_quiet
,
1516 /* Walk the class hierarchy dominated by TYPE. FN is called for each
1517 type in the hierarchy, in a breadth-first preorder traversal.
1518 If it ever returns a non-NULL value, that value is immediately
1519 returned and the walk is terminated. At each node, FN is passed a
1520 BINFO indicating the path from the currently visited base-class to
1521 TYPE. Before each base-class is walked QFN is called. If the
1522 value returned is nonzero, the base-class is walked; otherwise it
1523 is not. If QFN is NULL, it is treated as a function which always
1524 returns 1. Both FN and QFN are passed the DATA whenever they are
1527 Implementation notes: Uses a circular queue, which starts off on
1528 the stack but gets moved to the malloc arena if it needs to be
1529 enlarged. The underflow and overflow conditions are
1530 indistinguishable except by context: if head == tail and we just
1531 moved the head pointer, the queue is empty, but if we just moved
1532 the tail pointer, the queue is full.
1533 Start with enough room for ten concurrent base classes. That
1534 will be enough for most hierarchies. */
1535 #define BFS_WALK_INITIAL_QUEUE_SIZE 10
1538 bfs_walk (tree binfo
,
1539 tree (*fn
) (tree
, void *),
1540 tree (*qfn
) (tree
, int, void *),
1543 tree rval
= NULL_TREE
;
1545 tree bases_initial
[BFS_WALK_INITIAL_QUEUE_SIZE
];
1546 /* A circular queue of the base classes of BINFO. These will be
1547 built up in breadth-first order, except where QFN prunes the
1550 size_t base_buffer_size
= BFS_WALK_INITIAL_QUEUE_SIZE
;
1551 tree
*base_buffer
= bases_initial
;
1554 base_buffer
[tail
++] = binfo
;
1556 while (head
!= tail
)
1559 tree binfo
= base_buffer
[head
++];
1560 if (head
== base_buffer_size
)
1563 /* Is this the one we're looking for? If so, we're done. */
1564 rval
= fn (binfo
, data
);
1568 n_bases
= BINFO_N_BASE_BINFOS (binfo
);
1569 for (ix
= 0; ix
!= n_bases
; ix
++)
1574 base_binfo
= (*qfn
) (binfo
, ix
, data
);
1576 base_binfo
= BINFO_BASE_BINFO (binfo
, ix
);
1580 base_buffer
[tail
++] = base_binfo
;
1581 if (tail
== base_buffer_size
)
1585 tree
*new_buffer
= xmalloc (2 * base_buffer_size
1587 memcpy (&new_buffer
[0], &base_buffer
[0],
1588 tail
* sizeof (tree
));
1589 memcpy (&new_buffer
[head
+ base_buffer_size
],
1591 (base_buffer_size
- head
) * sizeof (tree
));
1592 if (base_buffer_size
!= BFS_WALK_INITIAL_QUEUE_SIZE
)
1594 base_buffer
= new_buffer
;
1595 head
+= base_buffer_size
;
1596 base_buffer_size
*= 2;
1603 if (base_buffer_size
!= BFS_WALK_INITIAL_QUEUE_SIZE
)
1608 /* Exactly like bfs_walk, except that a depth-first traversal is
1609 performed, and PREFN is called in preorder, while POSTFN is called
1613 dfs_walk_real (tree binfo
,
1614 tree (*prefn
) (tree
, void *),
1615 tree (*postfn
) (tree
, void *),
1616 tree (*qfn
) (tree
, int, void *),
1621 tree rval
= NULL_TREE
;
1623 /* Call the pre-order walking function. */
1626 rval
= (*prefn
) (binfo
, data
);
1631 /* Process the basetypes. */
1632 for (i
= 0; BINFO_BASE_ITERATE (binfo
, i
, base_binfo
); i
++)
1636 base_binfo
= (*qfn
) (binfo
, i
, data
);
1640 rval
= dfs_walk_real (base_binfo
, prefn
, postfn
, qfn
, data
);
1645 /* Call the post-order walking function. */
1647 rval
= (*postfn
) (binfo
, data
);
1652 /* Exactly like bfs_walk, except that a depth-first post-order traversal is
1656 dfs_walk (tree binfo
,
1657 tree (*fn
) (tree
, void *),
1658 tree (*qfn
) (tree
, int, void *),
1661 return dfs_walk_real (binfo
, 0, fn
, qfn
, data
);
1664 /* Check that virtual overrider OVERRIDER is acceptable for base function
1665 BASEFN. Issue diagnostic, and return zero, if unacceptable. */
1668 check_final_overrider (tree overrider
, tree basefn
)
1670 tree over_type
= TREE_TYPE (overrider
);
1671 tree base_type
= TREE_TYPE (basefn
);
1672 tree over_return
= TREE_TYPE (over_type
);
1673 tree base_return
= TREE_TYPE (base_type
);
1674 tree over_throw
= TYPE_RAISES_EXCEPTIONS (over_type
);
1675 tree base_throw
= TYPE_RAISES_EXCEPTIONS (base_type
);
1678 if (DECL_INVALID_OVERRIDER_P (overrider
))
1681 if (same_type_p (base_return
, over_return
))
1683 else if ((CLASS_TYPE_P (over_return
) && CLASS_TYPE_P (base_return
))
1684 || (TREE_CODE (base_return
) == TREE_CODE (over_return
)
1685 && POINTER_TYPE_P (base_return
)))
1687 /* Potentially covariant. */
1688 unsigned base_quals
, over_quals
;
1690 fail
= !POINTER_TYPE_P (base_return
);
1693 fail
= cp_type_quals (base_return
) != cp_type_quals (over_return
);
1695 base_return
= TREE_TYPE (base_return
);
1696 over_return
= TREE_TYPE (over_return
);
1698 base_quals
= cp_type_quals (base_return
);
1699 over_quals
= cp_type_quals (over_return
);
1701 if ((base_quals
& over_quals
) != over_quals
)
1704 if (CLASS_TYPE_P (base_return
) && CLASS_TYPE_P (over_return
))
1706 tree binfo
= lookup_base (over_return
, base_return
,
1707 ba_check
| ba_quiet
, NULL
);
1713 && can_convert (TREE_TYPE (base_type
), TREE_TYPE (over_type
)))
1714 /* GNU extension, allow trivial pointer conversions such as
1715 converting to void *, or qualification conversion. */
1717 /* can_convert will permit user defined conversion from a
1718 (reference to) class type. We must reject them. */
1719 over_return
= non_reference (TREE_TYPE (over_type
));
1720 if (CLASS_TYPE_P (over_return
))
1734 cp_error_at ("invalid covariant return type for `%#D'", overrider
);
1735 cp_error_at (" overriding `%#D'", basefn
);
1739 cp_error_at ("conflicting return type specified for `%#D'",
1741 cp_error_at (" overriding `%#D'", basefn
);
1743 DECL_INVALID_OVERRIDER_P (overrider
) = 1;
1747 /* Check throw specifier is at least as strict. */
1748 if (!comp_except_specs (base_throw
, over_throw
, 0))
1750 cp_error_at ("looser throw specifier for `%#F'", overrider
);
1751 cp_error_at (" overriding `%#F'", basefn
);
1752 DECL_INVALID_OVERRIDER_P (overrider
) = 1;
1759 /* Given a class TYPE, and a function decl FNDECL, look for
1760 virtual functions in TYPE's hierarchy which FNDECL overrides.
1761 We do not look in TYPE itself, only its bases.
1763 Returns nonzero, if we find any. Set FNDECL's DECL_VIRTUAL_P, if we
1764 find that it overrides anything.
1766 We check that every function which is overridden, is correctly
1770 look_for_overrides (tree type
, tree fndecl
)
1772 tree binfo
= TYPE_BINFO (type
);
1777 for (ix
= 0; BINFO_BASE_ITERATE (binfo
, ix
, base_binfo
); ix
++)
1779 tree basetype
= BINFO_TYPE (base_binfo
);
1781 if (TYPE_POLYMORPHIC_P (basetype
))
1782 found
+= look_for_overrides_r (basetype
, fndecl
);
1787 /* Look in TYPE for virtual functions with the same signature as
1791 look_for_overrides_here (tree type
, tree fndecl
)
1795 /* If there are no methods in TYPE (meaning that only implicitly
1796 declared methods will ever be provided for TYPE), then there are
1797 no virtual functions. */
1798 if (!CLASSTYPE_METHOD_VEC (type
))
1801 if (DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P (fndecl
))
1802 ix
= CLASSTYPE_DESTRUCTOR_SLOT
;
1804 ix
= lookup_fnfields_1 (type
, DECL_NAME (fndecl
));
1807 tree fns
= VEC_index (tree
, CLASSTYPE_METHOD_VEC (type
), ix
);
1809 for (; fns
; fns
= OVL_NEXT (fns
))
1811 tree fn
= OVL_CURRENT (fns
);
1813 if (!DECL_VIRTUAL_P (fn
))
1814 /* Not a virtual. */;
1815 else if (DECL_CONTEXT (fn
) != type
)
1816 /* Introduced with a using declaration. */;
1817 else if (DECL_STATIC_FUNCTION_P (fndecl
))
1819 tree btypes
= TYPE_ARG_TYPES (TREE_TYPE (fn
));
1820 tree dtypes
= TYPE_ARG_TYPES (TREE_TYPE (fndecl
));
1821 if (compparms (TREE_CHAIN (btypes
), dtypes
))
1824 else if (same_signature_p (fndecl
, fn
))
1831 /* Look in TYPE for virtual functions overridden by FNDECL. Check both
1832 TYPE itself and its bases. */
1835 look_for_overrides_r (tree type
, tree fndecl
)
1837 tree fn
= look_for_overrides_here (type
, fndecl
);
1840 if (DECL_STATIC_FUNCTION_P (fndecl
))
1842 /* A static member function cannot match an inherited
1843 virtual member function. */
1844 cp_error_at ("`%#D' cannot be declared", fndecl
);
1845 cp_error_at (" since `%#D' declared in base class", fn
);
1849 /* It's definitely virtual, even if not explicitly set. */
1850 DECL_VIRTUAL_P (fndecl
) = 1;
1851 check_final_overrider (fndecl
, fn
);
1856 /* We failed to find one declared in this class. Look in its bases. */
1857 return look_for_overrides (type
, fndecl
);
1860 /* Called via dfs_walk from dfs_get_pure_virtuals. */
1863 dfs_get_pure_virtuals (tree binfo
, void *data
)
1865 tree type
= (tree
) data
;
1867 /* We're not interested in primary base classes; the derived class
1868 of which they are a primary base will contain the information we
1870 if (!BINFO_PRIMARY_P (binfo
))
1874 for (virtuals
= BINFO_VIRTUALS (binfo
);
1876 virtuals
= TREE_CHAIN (virtuals
))
1877 if (DECL_PURE_VIRTUAL_P (BV_FN (virtuals
)))
1878 CLASSTYPE_PURE_VIRTUALS (type
)
1879 = tree_cons (NULL_TREE
, BV_FN (virtuals
),
1880 CLASSTYPE_PURE_VIRTUALS (type
));
1883 BINFO_MARKED (binfo
) = 1;
1888 /* Set CLASSTYPE_PURE_VIRTUALS for TYPE. */
1891 get_pure_virtuals (tree type
)
1897 /* Clear the CLASSTYPE_PURE_VIRTUALS list; whatever is already there
1898 is going to be overridden. */
1899 CLASSTYPE_PURE_VIRTUALS (type
) = NULL_TREE
;
1900 /* Now, run through all the bases which are not primary bases, and
1901 collect the pure virtual functions. We look at the vtable in
1902 each class to determine what pure virtual functions are present.
1903 (A primary base is not interesting because the derived class of
1904 which it is a primary base will contain vtable entries for the
1905 pure virtuals in the base class. */
1906 dfs_walk (TYPE_BINFO (type
), dfs_get_pure_virtuals
, unmarkedp
, type
);
1907 dfs_walk (TYPE_BINFO (type
), dfs_unmark
, markedp
, type
);
1909 /* Put the pure virtuals in dfs order. */
1910 CLASSTYPE_PURE_VIRTUALS (type
) = nreverse (CLASSTYPE_PURE_VIRTUALS (type
));
1912 for (vbases
= CLASSTYPE_VBASECLASSES (type
), ix
= 0;
1913 VEC_iterate (tree
, vbases
, ix
, binfo
); ix
++)
1917 for (virtuals
= BINFO_VIRTUALS (binfo
); virtuals
;
1918 virtuals
= TREE_CHAIN (virtuals
))
1920 tree base_fndecl
= BV_FN (virtuals
);
1921 if (DECL_NEEDS_FINAL_OVERRIDER_P (base_fndecl
))
1922 error ("`%#D' needs a final overrider", base_fndecl
);
1927 /* DEPTH-FIRST SEARCH ROUTINES. */
1930 markedp (tree derived
, int ix
, void *data ATTRIBUTE_UNUSED
)
1932 tree binfo
= BINFO_BASE_BINFO (derived
, ix
);
1934 return BINFO_MARKED (binfo
) ? binfo
: NULL_TREE
;
1938 unmarkedp (tree derived
, int ix
, void *data ATTRIBUTE_UNUSED
)
1940 tree binfo
= BINFO_BASE_BINFO (derived
, ix
);
1942 return !BINFO_MARKED (binfo
) ? binfo
: NULL_TREE
;
1945 /* The worker functions for `dfs_walk'. These do not need to
1946 test anything (vis a vis marking) if they are paired with
1947 a predicate function (above). */
1950 dfs_unmark (tree binfo
, void *data ATTRIBUTE_UNUSED
)
1952 BINFO_MARKED (binfo
) = 0;
1957 /* Debug info for C++ classes can get very large; try to avoid
1958 emitting it everywhere.
1960 Note that this optimization wins even when the target supports
1961 BINCL (if only slightly), and reduces the amount of work for the
1965 maybe_suppress_debug_info (tree t
)
1967 if (write_symbols
== NO_DEBUG
)
1970 /* We might have set this earlier in cp_finish_decl. */
1971 TYPE_DECL_SUPPRESS_DEBUG (TYPE_MAIN_DECL (t
)) = 0;
1973 /* If we already know how we're handling this class, handle debug info
1975 if (CLASSTYPE_INTERFACE_KNOWN (t
))
1977 if (CLASSTYPE_INTERFACE_ONLY (t
))
1978 TYPE_DECL_SUPPRESS_DEBUG (TYPE_MAIN_DECL (t
)) = 1;
1979 /* else don't set it. */
1981 /* If the class has a vtable, write out the debug info along with
1983 else if (TYPE_CONTAINS_VPTR_P (t
))
1984 TYPE_DECL_SUPPRESS_DEBUG (TYPE_MAIN_DECL (t
)) = 1;
1986 /* Otherwise, just emit the debug info normally. */
1989 /* Note that we want debugging information for a base class of a class
1990 whose vtable is being emitted. Normally, this would happen because
1991 calling the constructor for a derived class implies calling the
1992 constructors for all bases, which involve initializing the
1993 appropriate vptr with the vtable for the base class; but in the
1994 presence of optimization, this initialization may be optimized
1995 away, so we tell finish_vtable_vardecl that we want the debugging
1996 information anyway. */
1999 dfs_debug_mark (tree binfo
, void *data ATTRIBUTE_UNUSED
)
2001 tree t
= BINFO_TYPE (binfo
);
2003 CLASSTYPE_DEBUG_REQUESTED (t
) = 1;
2008 /* Returns BINFO if we haven't already noted that we want debugging
2009 info for this base class. */
2012 dfs_debug_unmarkedp (tree derived
, int ix
, void *data ATTRIBUTE_UNUSED
)
2014 tree binfo
= BINFO_BASE_BINFO (derived
, ix
);
2016 return (!CLASSTYPE_DEBUG_REQUESTED (BINFO_TYPE (binfo
))
2017 ? binfo
: NULL_TREE
);
2020 /* Write out the debugging information for TYPE, whose vtable is being
2021 emitted. Also walk through our bases and note that we want to
2022 write out information for them. This avoids the problem of not
2023 writing any debug info for intermediate basetypes whose
2024 constructors, and thus the references to their vtables, and thus
2025 the vtables themselves, were optimized away. */
2028 note_debug_info_needed (tree type
)
2030 if (TYPE_DECL_SUPPRESS_DEBUG (TYPE_NAME (type
)))
2032 TYPE_DECL_SUPPRESS_DEBUG (TYPE_NAME (type
)) = 0;
2033 rest_of_type_compilation (type
, toplevel_bindings_p ());
2036 dfs_walk (TYPE_BINFO (type
), dfs_debug_mark
, dfs_debug_unmarkedp
, 0);
2040 print_search_statistics (void)
2042 #ifdef GATHER_STATISTICS
2043 fprintf (stderr
, "%d fields searched in %d[%d] calls to lookup_field[_1]\n",
2044 n_fields_searched
, n_calls_lookup_field
, n_calls_lookup_field_1
);
2045 fprintf (stderr
, "%d fnfields searched in %d calls to lookup_fnfields\n",
2046 n_outer_fields_searched
, n_calls_lookup_fnfields
);
2047 fprintf (stderr
, "%d calls to get_base_type\n", n_calls_get_base_type
);
2048 #else /* GATHER_STATISTICS */
2049 fprintf (stderr
, "no search statistics\n");
2050 #endif /* GATHER_STATISTICS */
2054 reinit_search_statistics (void)
2056 #ifdef GATHER_STATISTICS
2057 n_fields_searched
= 0;
2058 n_calls_lookup_field
= 0, n_calls_lookup_field_1
= 0;
2059 n_calls_lookup_fnfields
= 0, n_calls_lookup_fnfields_1
= 0;
2060 n_calls_get_base_type
= 0;
2061 n_outer_fields_searched
= 0;
2062 n_contexts_saved
= 0;
2063 #endif /* GATHER_STATISTICS */
2066 /* Helper for lookup_conversions_r. TO_TYPE is the type converted to
2067 by a conversion op in base BINFO. VIRTUAL_DEPTH is non-zero if
2068 BINFO is morally virtual, and VIRTUALNESS is non-zero if virtual
2069 bases have been encountered already in the tree walk. PARENT_CONVS
2070 is the list of lists of conversion functions that could hide CONV
2071 and OTHER_CONVS is the list of lists of conversion functions that
2072 could hide or be hidden by CONV, should virtualness be involved in
2073 the hierarchy. Merely checking the conversion op's name is not
2074 enough because two conversion operators to the same type can have
2075 different names. Return non-zero if we are visible. */
2078 check_hidden_convs (tree binfo
, int virtual_depth
, int virtualness
,
2079 tree to_type
, tree parent_convs
, tree other_convs
)
2083 /* See if we are hidden by a parent conversion. */
2084 for (level
= parent_convs
; level
; level
= TREE_CHAIN (level
))
2085 for (probe
= TREE_VALUE (level
); probe
; probe
= TREE_CHAIN (probe
))
2086 if (same_type_p (to_type
, TREE_TYPE (probe
)))
2089 if (virtual_depth
|| virtualness
)
2091 /* In a virtual hierarchy, we could be hidden, or could hide a
2092 conversion function on the other_convs list. */
2093 for (level
= other_convs
; level
; level
= TREE_CHAIN (level
))
2099 if (!(virtual_depth
|| TREE_STATIC (level
)))
2100 /* Neither is morally virtual, so cannot hide each other. */
2103 if (!TREE_VALUE (level
))
2104 /* They evaporated away already. */
2107 they_hide_us
= (virtual_depth
2108 && original_binfo (binfo
, TREE_PURPOSE (level
)));
2109 we_hide_them
= (!they_hide_us
&& TREE_STATIC (level
)
2110 && original_binfo (TREE_PURPOSE (level
), binfo
));
2112 if (!(we_hide_them
|| they_hide_us
))
2113 /* Neither is within the other, so no hiding can occur. */
2116 for (prev
= &TREE_VALUE (level
), other
= *prev
; other
;)
2118 if (same_type_p (to_type
, TREE_TYPE (other
)))
2121 /* We are hidden. */
2126 /* We hide the other one. */
2127 other
= TREE_CHAIN (other
);
2132 prev
= &TREE_CHAIN (other
);
2140 /* Helper for lookup_conversions_r. PARENT_CONVS is a list of lists
2141 of conversion functions, the first slot will be for the current
2142 binfo, if MY_CONVS is non-NULL. CHILD_CONVS is the list of lists
2143 of conversion functions from childen of the current binfo,
2144 concatenated with conversions from elsewhere in the heirarchy --
2145 that list begins with OTHER_CONVS. Return a single list of lists
2146 containing only conversions from the current binfo and its
2150 split_conversions (tree my_convs
, tree parent_convs
,
2151 tree child_convs
, tree other_convs
)
2156 /* Remove the original other_convs portion from child_convs. */
2157 for (prev
= NULL
, t
= child_convs
;
2158 t
!= other_convs
; prev
= t
, t
= TREE_CHAIN (t
))
2162 TREE_CHAIN (prev
) = NULL_TREE
;
2164 child_convs
= NULL_TREE
;
2166 /* Attach the child convs to any we had at this level. */
2169 my_convs
= parent_convs
;
2170 TREE_CHAIN (my_convs
) = child_convs
;
2173 my_convs
= child_convs
;
2178 /* Worker for lookup_conversions. Lookup conversion functions in
2179 BINFO and its children. VIRTUAL_DEPTH is non-zero, if BINFO is in
2180 a morally virtual base, and VIRTUALNESS is non-zero, if we've
2181 encountered virtual bases already in the tree walk. PARENT_CONVS &
2182 PARENT_TPL_CONVS are lists of list of conversions within parent
2183 binfos. OTHER_CONVS and OTHER_TPL_CONVS are conversions found
2184 elsewhere in the tree. Return the conversions found within this
2185 portion of the graph in CONVS and TPL_CONVS. Return non-zero is we
2186 encountered virtualness. We keep template and non-template
2187 conversions separate, to avoid unnecessary type comparisons.
2189 The located conversion functions are held in lists of lists. The
2190 TREE_VALUE of the outer list is the list of conversion functions
2191 found in a particular binfo. The TREE_PURPOSE of both the outer
2192 and inner lists is the binfo at which those conversions were
2193 found. TREE_STATIC is set for those lists within of morally
2194 virtual binfos. The TREE_VALUE of the inner list is the conversion
2195 function or overload itself. The TREE_TYPE of each inner list node
2196 is the converted-to type. */
2199 lookup_conversions_r (tree binfo
,
2200 int virtual_depth
, int virtualness
,
2201 tree parent_convs
, tree parent_tpl_convs
,
2202 tree other_convs
, tree other_tpl_convs
,
2203 tree
*convs
, tree
*tpl_convs
)
2205 int my_virtualness
= 0;
2206 tree my_convs
= NULL_TREE
;
2207 tree my_tpl_convs
= NULL_TREE
;
2208 tree child_convs
= NULL_TREE
;
2209 tree child_tpl_convs
= NULL_TREE
;
2212 VEC(tree
) *method_vec
= CLASSTYPE_METHOD_VEC (BINFO_TYPE (binfo
));
2215 /* If we have no conversion operators, then don't look. */
2216 if (!TYPE_HAS_CONVERSION (BINFO_TYPE (binfo
)))
2218 *convs
= *tpl_convs
= NULL_TREE
;
2223 if (BINFO_VIRTUAL_P (binfo
))
2226 /* First, locate the unhidden ones at this level. */
2227 for (i
= CLASSTYPE_FIRST_CONVERSION_SLOT
;
2228 VEC_iterate (tree
, method_vec
, i
, conv
);
2231 tree cur
= OVL_CURRENT (conv
);
2233 if (!DECL_CONV_FN_P (cur
))
2236 if (TREE_CODE (cur
) == TEMPLATE_DECL
)
2238 /* Only template conversions can be overloaded, and we must
2239 flatten them out and check each one individually. */
2242 for (tpls
= conv
; tpls
; tpls
= OVL_NEXT (tpls
))
2244 tree tpl
= OVL_CURRENT (tpls
);
2245 tree type
= DECL_CONV_FN_TYPE (tpl
);
2247 if (check_hidden_convs (binfo
, virtual_depth
, virtualness
,
2248 type
, parent_tpl_convs
, other_tpl_convs
))
2250 my_tpl_convs
= tree_cons (binfo
, tpl
, my_tpl_convs
);
2251 TREE_TYPE (my_tpl_convs
) = type
;
2254 TREE_STATIC (my_tpl_convs
) = 1;
2262 tree name
= DECL_NAME (cur
);
2264 if (!IDENTIFIER_MARKED (name
))
2266 tree type
= DECL_CONV_FN_TYPE (cur
);
2268 if (check_hidden_convs (binfo
, virtual_depth
, virtualness
,
2269 type
, parent_convs
, other_convs
))
2271 my_convs
= tree_cons (binfo
, conv
, my_convs
);
2272 TREE_TYPE (my_convs
) = type
;
2275 TREE_STATIC (my_convs
) = 1;
2278 IDENTIFIER_MARKED (name
) = 1;
2286 parent_convs
= tree_cons (binfo
, my_convs
, parent_convs
);
2288 TREE_STATIC (parent_convs
) = 1;
2293 parent_tpl_convs
= tree_cons (binfo
, my_tpl_convs
, parent_tpl_convs
);
2295 TREE_STATIC (parent_convs
) = 1;
2298 child_convs
= other_convs
;
2299 child_tpl_convs
= other_tpl_convs
;
2301 /* Now iterate over each base, looking for more conversions. */
2302 for (i
= 0; BINFO_BASE_ITERATE (binfo
, i
, base_binfo
); i
++)
2304 tree base_convs
, base_tpl_convs
;
2305 unsigned base_virtualness
;
2307 base_virtualness
= lookup_conversions_r (base_binfo
,
2308 virtual_depth
, virtualness
,
2309 parent_convs
, parent_tpl_convs
,
2310 child_convs
, child_tpl_convs
,
2311 &base_convs
, &base_tpl_convs
);
2312 if (base_virtualness
)
2313 my_virtualness
= virtualness
= 1;
2314 child_convs
= chainon (base_convs
, child_convs
);
2315 child_tpl_convs
= chainon (base_tpl_convs
, child_tpl_convs
);
2318 /* Unmark the conversions found at this level */
2319 for (conv
= my_convs
; conv
; conv
= TREE_CHAIN (conv
))
2320 IDENTIFIER_MARKED (DECL_NAME (OVL_CURRENT (TREE_VALUE (conv
)))) = 0;
2322 *convs
= split_conversions (my_convs
, parent_convs
,
2323 child_convs
, other_convs
);
2324 *tpl_convs
= split_conversions (my_tpl_convs
, parent_tpl_convs
,
2325 child_tpl_convs
, other_tpl_convs
);
2327 return my_virtualness
;
2330 /* Return a TREE_LIST containing all the non-hidden user-defined
2331 conversion functions for TYPE (and its base-classes). The
2332 TREE_VALUE of each node is the FUNCTION_DECL of the conversion
2333 function. The TREE_PURPOSE is the BINFO from which the conversion
2334 functions in this node were selected. This function is effectively
2335 performing a set of member lookups as lookup_fnfield does, but
2336 using the type being converted to as the unique key, rather than the
2340 lookup_conversions (tree type
)
2342 tree convs
, tpl_convs
;
2343 tree list
= NULL_TREE
;
2345 complete_type (type
);
2346 if (!TYPE_BINFO (type
))
2349 lookup_conversions_r (TYPE_BINFO (type
), 0, 0,
2350 NULL_TREE
, NULL_TREE
, NULL_TREE
, NULL_TREE
,
2351 &convs
, &tpl_convs
);
2353 /* Flatten the list-of-lists */
2354 for (; convs
; convs
= TREE_CHAIN (convs
))
2358 for (probe
= TREE_VALUE (convs
); probe
; probe
= next
)
2360 next
= TREE_CHAIN (probe
);
2362 TREE_CHAIN (probe
) = list
;
2367 for (; tpl_convs
; tpl_convs
= TREE_CHAIN (tpl_convs
))
2371 for (probe
= TREE_VALUE (tpl_convs
); probe
; probe
= next
)
2373 next
= TREE_CHAIN (probe
);
2375 TREE_CHAIN (probe
) = list
;
2389 /* Check whether the empty class indicated by EMPTY_BINFO is also present
2390 at offset 0 in COMPARE_TYPE, and set found_overlap if so. */
2393 dfs_check_overlap (tree empty_binfo
, void *data
)
2395 struct overlap_info
*oi
= (struct overlap_info
*) data
;
2398 for (binfo
= TYPE_BINFO (oi
->compare_type
);
2400 binfo
= BINFO_BASE_BINFO (binfo
, 0))
2402 if (BINFO_TYPE (binfo
) == BINFO_TYPE (empty_binfo
))
2404 oi
->found_overlap
= 1;
2407 else if (!BINFO_N_BASE_BINFOS (binfo
))
2414 /* Trivial function to stop base traversal when we find something. */
2417 dfs_no_overlap_yet (tree derived
, int ix
, void *data
)
2419 tree binfo
= BINFO_BASE_BINFO (derived
, ix
);
2420 struct overlap_info
*oi
= (struct overlap_info
*) data
;
2422 return !oi
->found_overlap
? binfo
: NULL_TREE
;
2425 /* Returns nonzero if EMPTY_TYPE or any of its bases can also be found at
2426 offset 0 in NEXT_TYPE. Used in laying out empty base class subobjects. */
2429 types_overlap_p (tree empty_type
, tree next_type
)
2431 struct overlap_info oi
;
2433 if (! IS_AGGR_TYPE (next_type
))
2435 oi
.compare_type
= next_type
;
2436 oi
.found_overlap
= 0;
2437 dfs_walk (TYPE_BINFO (empty_type
), dfs_check_overlap
,
2438 dfs_no_overlap_yet
, &oi
);
2439 return oi
.found_overlap
;
2442 /* Returns the binfo of the first direct or indirect virtual base derived
2443 from BINFO, or NULL if binfo is not via virtual. */
2446 binfo_from_vbase (tree binfo
)
2448 for (; binfo
; binfo
= BINFO_INHERITANCE_CHAIN (binfo
))
2450 if (BINFO_VIRTUAL_P (binfo
))
2456 /* Returns the binfo of the first direct or indirect virtual base derived
2457 from BINFO up to the TREE_TYPE, LIMIT, or NULL if binfo is not
2461 binfo_via_virtual (tree binfo
, tree limit
)
2463 for (; binfo
&& (!limit
|| !same_type_p (BINFO_TYPE (binfo
), limit
));
2464 binfo
= BINFO_INHERITANCE_CHAIN (binfo
))
2466 if (BINFO_VIRTUAL_P (binfo
))
2472 /* BINFO is a base binfo in the complete type BINFO_TYPE (HERE).
2473 Find the equivalent binfo within whatever graph HERE is located.
2474 This is the inverse of original_binfo. */
2477 copied_binfo (tree binfo
, tree here
)
2479 tree result
= NULL_TREE
;
2481 if (BINFO_VIRTUAL_P (binfo
))
2485 for (t
= here
; BINFO_INHERITANCE_CHAIN (t
);
2486 t
= BINFO_INHERITANCE_CHAIN (t
))
2489 result
= binfo_for_vbase (BINFO_TYPE (binfo
), BINFO_TYPE (t
));
2491 else if (BINFO_INHERITANCE_CHAIN (binfo
))
2497 cbinfo
= copied_binfo (BINFO_INHERITANCE_CHAIN (binfo
), here
);
2498 for (ix
= 0; BINFO_BASE_ITERATE (cbinfo
, ix
, base_binfo
); ix
++)
2499 if (BINFO_TYPE (base_binfo
) == BINFO_TYPE (binfo
))
2501 result
= base_binfo
;
2507 gcc_assert (BINFO_TYPE (here
) == BINFO_TYPE (binfo
));
2511 gcc_assert (result
);
2516 binfo_for_vbase (tree base
, tree t
)
2522 for (vbases
= CLASSTYPE_VBASECLASSES (t
), ix
= 0;
2523 VEC_iterate (tree
, vbases
, ix
, binfo
); ix
++)
2524 if (BINFO_TYPE (binfo
) == base
)
2529 /* BINFO is some base binfo of HERE, within some other
2530 hierarchy. Return the equivalent binfo, but in the hierarchy
2531 dominated by HERE. This is the inverse of copied_binfo. If BINFO
2532 is not a base binfo of HERE, returns NULL_TREE. */
2535 original_binfo (tree binfo
, tree here
)
2539 if (BINFO_TYPE (binfo
) == BINFO_TYPE (here
))
2541 else if (BINFO_VIRTUAL_P (binfo
))
2542 result
= (CLASSTYPE_VBASECLASSES (BINFO_TYPE (here
))
2543 ? binfo_for_vbase (BINFO_TYPE (binfo
), BINFO_TYPE (here
))
2545 else if (BINFO_INHERITANCE_CHAIN (binfo
))
2549 base_binfos
= original_binfo (BINFO_INHERITANCE_CHAIN (binfo
), here
);
2555 for (ix
= 0; (base_binfo
= BINFO_BASE_BINFO (base_binfos
, ix
)); ix
++)
2556 if (BINFO_TYPE (base_binfo
) == BINFO_TYPE (binfo
))
2558 result
= base_binfo
;