1 /* Functions related to building classes and their related objects.
2 Copyright (C) 1987, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
3 1999, 2000, 2001, 2002, 2003, 2004 Free Software Foundation, Inc.
4 Contributed by Michael Tiemann (tiemann@cygnus.com)
6 This file is part of GCC.
8 GCC is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2, or (at your option)
13 GCC is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with GCC; see the file COPYING. If not, write to
20 the Free Software Foundation, 59 Temple Place - Suite 330,
21 Boston, MA 02111-1307, USA. */
24 /* High-level class interface. */
28 #include "coretypes.h"
39 /* The number of nested classes being processed. If we are not in the
40 scope of any class, this is zero. */
42 int current_class_depth
;
44 /* In order to deal with nested classes, we keep a stack of classes.
45 The topmost entry is the innermost class, and is the entry at index
46 CURRENT_CLASS_DEPTH */
48 typedef struct class_stack_node
{
49 /* The name of the class. */
52 /* The _TYPE node for the class. */
55 /* The access specifier pending for new declarations in the scope of
59 /* If were defining TYPE, the names used in this class. */
60 splay_tree names_used
;
61 }* class_stack_node_t
;
63 typedef struct vtbl_init_data_s
65 /* The base for which we're building initializers. */
67 /* The type of the most-derived type. */
69 /* The binfo for the dynamic type. This will be TYPE_BINFO (derived),
70 unless ctor_vtbl_p is true. */
72 /* The negative-index vtable initializers built up so far. These
73 are in order from least negative index to most negative index. */
75 /* The last (i.e., most negative) entry in INITS. */
77 /* The binfo for the virtual base for which we're building
78 vcall offset initializers. */
80 /* The functions in vbase for which we have already provided vcall
83 /* The vtable index of the next vcall or vbase offset. */
85 /* Nonzero if we are building the initializer for the primary
88 /* Nonzero if we are building the initializer for a construction
91 /* True when adding vcall offset entries to the vtable. False when
92 merely computing the indices. */
93 bool generate_vcall_entries
;
96 /* The type of a function passed to walk_subobject_offsets. */
97 typedef int (*subobject_offset_fn
) (tree
, tree
, splay_tree
);
99 /* The stack itself. This is a dynamically resized array. The
100 number of elements allocated is CURRENT_CLASS_STACK_SIZE. */
101 static int current_class_stack_size
;
102 static class_stack_node_t current_class_stack
;
104 /* An array of all local classes present in this translation unit, in
105 declaration order. */
106 varray_type local_classes
;
108 static tree
get_vfield_name (tree
);
109 static void finish_struct_anon (tree
);
110 static tree
get_vtable_name (tree
);
111 static tree
get_basefndecls (tree
, tree
);
112 static int build_primary_vtable (tree
, tree
);
113 static int build_secondary_vtable (tree
);
114 static void finish_vtbls (tree
);
115 static void modify_vtable_entry (tree
, tree
, tree
, tree
, tree
*);
116 static void finish_struct_bits (tree
);
117 static int alter_access (tree
, tree
, tree
);
118 static void handle_using_decl (tree
, tree
);
119 static void check_for_override (tree
, tree
);
120 static tree
dfs_modify_vtables (tree
, void *);
121 static tree
modify_all_vtables (tree
, tree
);
122 static void determine_primary_bases (tree
);
123 static void finish_struct_methods (tree
);
124 static void maybe_warn_about_overly_private_class (tree
);
125 static int method_name_cmp (const void *, const void *);
126 static int resort_method_name_cmp (const void *, const void *);
127 static void add_implicitly_declared_members (tree
, int, int, int);
128 static tree
fixed_type_or_null (tree
, int *, int *);
129 static tree
resolve_address_of_overloaded_function (tree
, tree
, tsubst_flags_t
,
131 static tree
build_simple_base_path (tree expr
, tree binfo
);
132 static tree
build_vtbl_ref_1 (tree
, tree
);
133 static tree
build_vtbl_initializer (tree
, tree
, tree
, tree
, int *);
134 static int count_fields (tree
);
135 static int add_fields_to_record_type (tree
, struct sorted_fields_type
*, int);
136 static void check_bitfield_decl (tree
);
137 static void check_field_decl (tree
, tree
, int *, int *, int *, int *);
138 static void check_field_decls (tree
, tree
*, int *, int *, int *);
139 static tree
*build_base_field (record_layout_info
, tree
, splay_tree
, tree
*);
140 static void build_base_fields (record_layout_info
, splay_tree
, tree
*);
141 static void check_methods (tree
);
142 static void remove_zero_width_bit_fields (tree
);
143 static void check_bases (tree
, int *, int *, int *);
144 static void check_bases_and_members (tree
);
145 static tree
create_vtable_ptr (tree
, tree
*);
146 static void include_empty_classes (record_layout_info
);
147 static void layout_class_type (tree
, tree
*);
148 static void fixup_pending_inline (tree
);
149 static void fixup_inline_methods (tree
);
150 static void propagate_binfo_offsets (tree
, tree
);
151 static void layout_virtual_bases (record_layout_info
, splay_tree
);
152 static void build_vbase_offset_vtbl_entries (tree
, vtbl_init_data
*);
153 static void add_vcall_offset_vtbl_entries_r (tree
, vtbl_init_data
*);
154 static void add_vcall_offset_vtbl_entries_1 (tree
, vtbl_init_data
*);
155 static void build_vcall_offset_vtbl_entries (tree
, vtbl_init_data
*);
156 static void add_vcall_offset (tree
, tree
, vtbl_init_data
*);
157 static void layout_vtable_decl (tree
, int);
158 static tree
dfs_find_final_overrider_pre (tree
, void *);
159 static tree
dfs_find_final_overrider_post (tree
, void *);
160 static tree
find_final_overrider (tree
, tree
, tree
);
161 static int make_new_vtable (tree
, tree
);
162 static int maybe_indent_hierarchy (FILE *, int, int);
163 static tree
dump_class_hierarchy_r (FILE *, int, tree
, tree
, int);
164 static void dump_class_hierarchy (tree
);
165 static void dump_class_hierarchy_1 (FILE *, int, tree
);
166 static void dump_array (FILE *, tree
);
167 static void dump_vtable (tree
, tree
, tree
);
168 static void dump_vtt (tree
, tree
);
169 static void dump_thunk (FILE *, int, tree
);
170 static tree
build_vtable (tree
, tree
, tree
);
171 static void initialize_vtable (tree
, tree
);
172 static void layout_nonempty_base_or_field (record_layout_info
,
173 tree
, tree
, splay_tree
);
174 static tree
end_of_class (tree
, int);
175 static bool layout_empty_base (tree
, tree
, splay_tree
);
176 static void accumulate_vtbl_inits (tree
, tree
, tree
, tree
, tree
);
177 static tree
dfs_accumulate_vtbl_inits (tree
, tree
, tree
, tree
,
179 static void build_rtti_vtbl_entries (tree
, vtbl_init_data
*);
180 static void build_vcall_and_vbase_vtbl_entries (tree
, vtbl_init_data
*);
181 static void clone_constructors_and_destructors (tree
);
182 static tree
build_clone (tree
, tree
);
183 static void update_vtable_entry_for_fn (tree
, tree
, tree
, tree
*, unsigned);
184 static void build_ctor_vtbl_group (tree
, tree
);
185 static void build_vtt (tree
);
186 static tree
binfo_ctor_vtable (tree
);
187 static tree
*build_vtt_inits (tree
, tree
, tree
*, tree
*);
188 static tree
dfs_build_secondary_vptr_vtt_inits (tree
, void *);
189 static tree
dfs_fixup_binfo_vtbls (tree
, void *);
190 static int record_subobject_offset (tree
, tree
, splay_tree
);
191 static int check_subobject_offset (tree
, tree
, splay_tree
);
192 static int walk_subobject_offsets (tree
, subobject_offset_fn
,
193 tree
, splay_tree
, tree
, int);
194 static void record_subobject_offsets (tree
, tree
, splay_tree
, int);
195 static int layout_conflict_p (tree
, tree
, splay_tree
, int);
196 static int splay_tree_compare_integer_csts (splay_tree_key k1
,
198 static void warn_about_ambiguous_bases (tree
);
199 static bool type_requires_array_cookie (tree
);
200 static bool contains_empty_class_p (tree
);
201 static bool base_derived_from (tree
, tree
);
202 static int empty_base_at_nonzero_offset_p (tree
, tree
, splay_tree
);
203 static tree
end_of_base (tree
);
204 static tree
get_vcall_index (tree
, tree
);
206 /* Variables shared between class.c and call.c. */
208 #ifdef GATHER_STATISTICS
210 int n_vtable_entries
= 0;
211 int n_vtable_searches
= 0;
212 int n_vtable_elems
= 0;
213 int n_convert_harshness
= 0;
214 int n_compute_conversion_costs
= 0;
215 int n_inner_fields_searched
= 0;
218 /* Convert to or from a base subobject. EXPR is an expression of type
219 `A' or `A*', an expression of type `B' or `B*' is returned. To
220 convert A to a base B, CODE is PLUS_EXPR and BINFO is the binfo for
221 the B base instance within A. To convert base A to derived B, CODE
222 is MINUS_EXPR and BINFO is the binfo for the A instance within B.
223 In this latter case, A must not be a morally virtual base of B.
224 NONNULL is true if EXPR is known to be non-NULL (this is only
225 needed when EXPR is of pointer type). CV qualifiers are preserved
229 build_base_path (enum tree_code code
,
234 tree v_binfo
= NULL_TREE
;
235 tree d_binfo
= NULL_TREE
;
239 tree null_test
= NULL
;
240 tree ptr_target_type
;
242 int want_pointer
= TREE_CODE (TREE_TYPE (expr
)) == POINTER_TYPE
;
243 bool has_empty
= false;
246 if (expr
== error_mark_node
|| binfo
== error_mark_node
|| !binfo
)
247 return error_mark_node
;
249 for (probe
= binfo
; probe
; probe
= BINFO_INHERITANCE_CHAIN (probe
))
252 if (is_empty_class (BINFO_TYPE (probe
)))
254 if (!v_binfo
&& BINFO_VIRTUAL_P (probe
))
258 probe
= TYPE_MAIN_VARIANT (TREE_TYPE (expr
));
260 probe
= TYPE_MAIN_VARIANT (TREE_TYPE (probe
));
262 gcc_assert ((code
== MINUS_EXPR
263 && SAME_BINFO_TYPE_P (BINFO_TYPE (binfo
), probe
))
264 || (code
== PLUS_EXPR
265 && SAME_BINFO_TYPE_P (BINFO_TYPE (d_binfo
), probe
)));
267 if (binfo
== d_binfo
)
271 if (code
== MINUS_EXPR
&& v_binfo
)
273 error ("cannot convert from base %qT to derived type %qT via virtual base %qT",
274 BINFO_TYPE (binfo
), BINFO_TYPE (d_binfo
), BINFO_TYPE (v_binfo
));
275 return error_mark_node
;
279 /* This must happen before the call to save_expr. */
280 expr
= build_unary_op (ADDR_EXPR
, expr
, 0);
282 offset
= BINFO_OFFSET (binfo
);
283 fixed_type_p
= resolves_to_fixed_type_p (expr
, &nonnull
);
285 /* Do we need to look in the vtable for the real offset? */
286 virtual_access
= (v_binfo
&& fixed_type_p
<= 0);
288 /* Do we need to check for a null pointer? */
289 if (want_pointer
&& !nonnull
&& (virtual_access
|| !integer_zerop (offset
)))
290 null_test
= error_mark_node
;
292 /* Protect against multiple evaluation if necessary. */
293 if (TREE_SIDE_EFFECTS (expr
) && (null_test
|| virtual_access
))
294 expr
= save_expr (expr
);
296 /* Now that we've saved expr, build the real null test. */
298 null_test
= fold (build2 (NE_EXPR
, boolean_type_node
,
299 expr
, integer_zero_node
));
301 /* If this is a simple base reference, express it as a COMPONENT_REF. */
302 if (code
== PLUS_EXPR
&& !virtual_access
303 /* We don't build base fields for empty bases, and they aren't very
304 interesting to the optimizers anyway. */
307 expr
= build_indirect_ref (expr
, NULL
);
308 expr
= build_simple_base_path (expr
, binfo
);
310 expr
= build_address (expr
);
311 target_type
= TREE_TYPE (expr
);
317 /* Going via virtual base V_BINFO. We need the static offset
318 from V_BINFO to BINFO, and the dynamic offset from D_BINFO to
319 V_BINFO. That offset is an entry in D_BINFO's vtable. */
322 if (fixed_type_p
< 0 && in_base_initializer
)
324 /* In a base member initializer, we cannot rely on
325 the vtable being set up. We have to use the vtt_parm. */
326 tree derived
= BINFO_INHERITANCE_CHAIN (v_binfo
);
329 t
= TREE_TYPE (TYPE_VFIELD (BINFO_TYPE (derived
)));
330 t
= build_pointer_type (t
);
331 v_offset
= convert (t
, current_vtt_parm
);
332 v_offset
= build2 (PLUS_EXPR
, t
, v_offset
,
333 BINFO_VPTR_INDEX (derived
));
334 v_offset
= build_indirect_ref (v_offset
, NULL
);
337 v_offset
= build_vfield_ref (build_indirect_ref (expr
, NULL
),
338 TREE_TYPE (TREE_TYPE (expr
)));
340 v_offset
= build2 (PLUS_EXPR
, TREE_TYPE (v_offset
),
341 v_offset
, BINFO_VPTR_FIELD (v_binfo
));
342 v_offset
= build1 (NOP_EXPR
,
343 build_pointer_type (ptrdiff_type_node
),
345 v_offset
= build_indirect_ref (v_offset
, NULL
);
346 TREE_CONSTANT (v_offset
) = 1;
347 TREE_INVARIANT (v_offset
) = 1;
349 offset
= convert_to_integer (ptrdiff_type_node
,
351 BINFO_OFFSET (v_binfo
)));
353 if (!integer_zerop (offset
))
354 v_offset
= build2 (code
, ptrdiff_type_node
, v_offset
, offset
);
356 if (fixed_type_p
< 0)
357 /* Negative fixed_type_p means this is a constructor or destructor;
358 virtual base layout is fixed in in-charge [cd]tors, but not in
360 offset
= build3 (COND_EXPR
, ptrdiff_type_node
,
361 build2 (EQ_EXPR
, boolean_type_node
,
362 current_in_charge_parm
, integer_zero_node
),
364 BINFO_OFFSET (binfo
));
369 target_type
= code
== PLUS_EXPR
? BINFO_TYPE (binfo
) : BINFO_TYPE (d_binfo
);
371 target_type
= cp_build_qualified_type
372 (target_type
, cp_type_quals (TREE_TYPE (TREE_TYPE (expr
))));
373 ptr_target_type
= build_pointer_type (target_type
);
375 target_type
= ptr_target_type
;
377 expr
= build1 (NOP_EXPR
, ptr_target_type
, expr
);
379 if (!integer_zerop (offset
))
380 expr
= build2 (code
, ptr_target_type
, expr
, offset
);
385 expr
= build_indirect_ref (expr
, NULL
);
389 expr
= fold (build3 (COND_EXPR
, target_type
, null_test
, expr
,
390 fold (build1 (NOP_EXPR
, target_type
,
391 integer_zero_node
))));
396 /* Subroutine of build_base_path; EXPR and BINFO are as in that function.
397 Perform a derived-to-base conversion by recursively building up a
398 sequence of COMPONENT_REFs to the appropriate base fields. */
401 build_simple_base_path (tree expr
, tree binfo
)
403 tree type
= BINFO_TYPE (binfo
);
404 tree d_binfo
= BINFO_INHERITANCE_CHAIN (binfo
);
407 if (d_binfo
== NULL_TREE
)
409 gcc_assert (TYPE_MAIN_VARIANT (TREE_TYPE (expr
)) == type
);
414 expr
= build_simple_base_path (expr
, d_binfo
);
416 for (field
= TYPE_FIELDS (BINFO_TYPE (d_binfo
));
417 field
; field
= TREE_CHAIN (field
))
418 /* Is this the base field created by build_base_field? */
419 if (TREE_CODE (field
) == FIELD_DECL
420 && DECL_FIELD_IS_BASE (field
)
421 && TREE_TYPE (field
) == type
)
422 return build_class_member_access_expr (expr
, field
,
425 /* Didn't find the base field?!? */
429 /* Convert OBJECT to the base TYPE. If CHECK_ACCESS is true, an error
430 message is emitted if TYPE is inaccessible. OBJECT is assumed to
434 convert_to_base (tree object
, tree type
, bool check_access
)
438 binfo
= lookup_base (TREE_TYPE (object
), type
,
439 check_access
? ba_check
: ba_unique
,
441 if (!binfo
|| binfo
== error_mark_node
)
442 return error_mark_node
;
444 return build_base_path (PLUS_EXPR
, object
, binfo
, /*nonnull=*/1);
447 /* EXPR is an expression with unqualified class type. BASE is a base
448 binfo of that class type. Returns EXPR, converted to the BASE
449 type. This function assumes that EXPR is the most derived class;
450 therefore virtual bases can be found at their static offsets. */
453 convert_to_base_statically (tree expr
, tree base
)
457 expr_type
= TREE_TYPE (expr
);
458 if (!SAME_BINFO_TYPE_P (BINFO_TYPE (base
), expr_type
))
462 pointer_type
= build_pointer_type (expr_type
);
463 expr
= build_unary_op (ADDR_EXPR
, expr
, /*noconvert=*/1);
464 if (!integer_zerop (BINFO_OFFSET (base
)))
465 expr
= build2 (PLUS_EXPR
, pointer_type
, expr
,
466 build_nop (pointer_type
, BINFO_OFFSET (base
)));
467 expr
= build_nop (build_pointer_type (BINFO_TYPE (base
)), expr
);
468 expr
= build1 (INDIRECT_REF
, BINFO_TYPE (base
), expr
);
476 build_vfield_ref (tree datum
, tree type
)
478 tree vfield
, vcontext
;
480 if (datum
== error_mark_node
)
481 return error_mark_node
;
483 if (TREE_CODE (TREE_TYPE (datum
)) == REFERENCE_TYPE
)
484 datum
= convert_from_reference (datum
);
486 /* First, convert to the requested type. */
487 if (!same_type_ignoring_top_level_qualifiers_p (TREE_TYPE (datum
), type
))
488 datum
= convert_to_base (datum
, type
, /*check_access=*/false);
490 /* Second, the requested type may not be the owner of its own vptr.
491 If not, convert to the base class that owns it. We cannot use
492 convert_to_base here, because VCONTEXT may appear more than once
493 in the inheritance hierarchy of TYPE, and thus direct conversion
494 between the types may be ambiguous. Following the path back up
495 one step at a time via primary bases avoids the problem. */
496 vfield
= TYPE_VFIELD (type
);
497 vcontext
= DECL_CONTEXT (vfield
);
498 while (!same_type_ignoring_top_level_qualifiers_p (vcontext
, type
))
500 datum
= build_simple_base_path (datum
, CLASSTYPE_PRIMARY_BINFO (type
));
501 type
= TREE_TYPE (datum
);
504 return build3 (COMPONENT_REF
, TREE_TYPE (vfield
), datum
, vfield
, NULL_TREE
);
507 /* Given an object INSTANCE, return an expression which yields the
508 vtable element corresponding to INDEX. There are many special
509 cases for INSTANCE which we take care of here, mainly to avoid
510 creating extra tree nodes when we don't have to. */
513 build_vtbl_ref_1 (tree instance
, tree idx
)
516 tree vtbl
= NULL_TREE
;
518 /* Try to figure out what a reference refers to, and
519 access its virtual function table directly. */
522 tree fixed_type
= fixed_type_or_null (instance
, NULL
, &cdtorp
);
524 tree basetype
= non_reference (TREE_TYPE (instance
));
526 if (fixed_type
&& !cdtorp
)
528 tree binfo
= lookup_base (fixed_type
, basetype
,
529 ba_unique
| ba_quiet
, NULL
);
531 vtbl
= unshare_expr (BINFO_VTABLE (binfo
));
535 vtbl
= build_vfield_ref (instance
, basetype
);
537 assemble_external (vtbl
);
539 aref
= build_array_ref (vtbl
, idx
);
540 TREE_CONSTANT (aref
) |= TREE_CONSTANT (vtbl
) && TREE_CONSTANT (idx
);
541 TREE_INVARIANT (aref
) = TREE_CONSTANT (aref
);
547 build_vtbl_ref (tree instance
, tree idx
)
549 tree aref
= build_vtbl_ref_1 (instance
, idx
);
554 /* Given a stable object pointer INSTANCE_PTR, return an expression which
555 yields a function pointer corresponding to vtable element INDEX. */
558 build_vfn_ref (tree instance_ptr
, tree idx
)
562 aref
= build_vtbl_ref_1 (build_indirect_ref (instance_ptr
, 0), idx
);
564 /* When using function descriptors, the address of the
565 vtable entry is treated as a function pointer. */
566 if (TARGET_VTABLE_USES_DESCRIPTORS
)
567 aref
= build1 (NOP_EXPR
, TREE_TYPE (aref
),
568 build_unary_op (ADDR_EXPR
, aref
, /*noconvert=*/1));
570 /* Remember this as a method reference, for later devirtualization. */
571 aref
= build3 (OBJ_TYPE_REF
, TREE_TYPE (aref
), aref
, instance_ptr
, idx
);
576 /* Return the name of the virtual function table (as an IDENTIFIER_NODE)
577 for the given TYPE. */
580 get_vtable_name (tree type
)
582 return mangle_vtbl_for_type (type
);
585 /* Return an IDENTIFIER_NODE for the name of the virtual table table
589 get_vtt_name (tree type
)
591 return mangle_vtt_for_type (type
);
594 /* DECL is an entity associated with TYPE, like a virtual table or an
595 implicitly generated constructor. Determine whether or not DECL
596 should have external or internal linkage at the object file
597 level. This routine does not deal with COMDAT linkage and other
598 similar complexities; it simply sets TREE_PUBLIC if it possible for
599 entities in other translation units to contain copies of DECL, in
603 set_linkage_according_to_type (tree type
, tree decl
)
605 /* If TYPE involves a local class in a function with internal
606 linkage, then DECL should have internal linkage too. Other local
607 classes have no linkage -- but if their containing functions
608 have external linkage, it makes sense for DECL to have external
609 linkage too. That will allow template definitions to be merged,
611 if (no_linkage_check (type
, /*relaxed_p=*/true))
613 TREE_PUBLIC (decl
) = 0;
614 DECL_INTERFACE_KNOWN (decl
) = 1;
617 TREE_PUBLIC (decl
) = 1;
620 /* Create a VAR_DECL for a primary or secondary vtable for CLASS_TYPE.
621 (For a secondary vtable for B-in-D, CLASS_TYPE should be D, not B.)
622 Use NAME for the name of the vtable, and VTABLE_TYPE for its type. */
625 build_vtable (tree class_type
, tree name
, tree vtable_type
)
629 decl
= build_lang_decl (VAR_DECL
, name
, vtable_type
);
630 /* vtable names are already mangled; give them their DECL_ASSEMBLER_NAME
631 now to avoid confusion in mangle_decl. */
632 SET_DECL_ASSEMBLER_NAME (decl
, name
);
633 DECL_CONTEXT (decl
) = class_type
;
634 DECL_ARTIFICIAL (decl
) = 1;
635 TREE_STATIC (decl
) = 1;
636 TREE_READONLY (decl
) = 1;
637 DECL_VIRTUAL_P (decl
) = 1;
638 DECL_ALIGN (decl
) = TARGET_VTABLE_ENTRY_ALIGN
;
639 DECL_VTABLE_OR_VTT_P (decl
) = 1;
640 /* At one time the vtable info was grabbed 2 words at a time. This
641 fails on sparc unless you have 8-byte alignment. (tiemann) */
642 DECL_ALIGN (decl
) = MAX (TYPE_ALIGN (double_type_node
),
644 set_linkage_according_to_type (class_type
, decl
);
645 /* The vtable has not been defined -- yet. */
646 DECL_EXTERNAL (decl
) = 1;
647 DECL_NOT_REALLY_EXTERN (decl
) = 1;
649 if (write_symbols
== DWARF2_DEBUG
)
650 /* Mark the VAR_DECL node representing the vtable itself as a
651 "gratuitous" one, thereby forcing dwarfout.c to ignore it. It
652 is rather important that such things be ignored because any
653 effort to actually generate DWARF for them will run into
654 trouble when/if we encounter code like:
657 struct S { virtual void member (); };
659 because the artificial declaration of the vtable itself (as
660 manufactured by the g++ front end) will say that the vtable is
661 a static member of `S' but only *after* the debug output for
662 the definition of `S' has already been output. This causes
663 grief because the DWARF entry for the definition of the vtable
664 will try to refer back to an earlier *declaration* of the
665 vtable as a static member of `S' and there won't be one. We
666 might be able to arrange to have the "vtable static member"
667 attached to the member list for `S' before the debug info for
668 `S' get written (which would solve the problem) but that would
669 require more intrusive changes to the g++ front end. */
670 DECL_IGNORED_P (decl
) = 1;
675 /* Get the VAR_DECL of the vtable for TYPE. TYPE need not be polymorphic,
676 or even complete. If this does not exist, create it. If COMPLETE is
677 nonzero, then complete the definition of it -- that will render it
678 impossible to actually build the vtable, but is useful to get at those
679 which are known to exist in the runtime. */
682 get_vtable_decl (tree type
, int complete
)
686 if (CLASSTYPE_VTABLES (type
))
687 return CLASSTYPE_VTABLES (type
);
689 decl
= build_vtable (type
, get_vtable_name (type
), vtbl_type_node
);
690 CLASSTYPE_VTABLES (type
) = decl
;
694 DECL_EXTERNAL (decl
) = 1;
695 cp_finish_decl (decl
, NULL_TREE
, NULL_TREE
, 0);
701 /* Build the primary virtual function table for TYPE. If BINFO is
702 non-NULL, build the vtable starting with the initial approximation
703 that it is the same as the one which is the head of the association
704 list. Returns a nonzero value if a new vtable is actually
708 build_primary_vtable (tree binfo
, tree type
)
713 decl
= get_vtable_decl (type
, /*complete=*/0);
717 if (BINFO_NEW_VTABLE_MARKED (binfo
))
718 /* We have already created a vtable for this base, so there's
719 no need to do it again. */
722 virtuals
= copy_list (BINFO_VIRTUALS (binfo
));
723 TREE_TYPE (decl
) = TREE_TYPE (get_vtbl_decl_for_binfo (binfo
));
724 DECL_SIZE (decl
) = TYPE_SIZE (TREE_TYPE (decl
));
725 DECL_SIZE_UNIT (decl
) = TYPE_SIZE_UNIT (TREE_TYPE (decl
));
729 gcc_assert (TREE_TYPE (decl
) == vtbl_type_node
);
730 virtuals
= NULL_TREE
;
733 #ifdef GATHER_STATISTICS
735 n_vtable_elems
+= list_length (virtuals
);
738 /* Initialize the association list for this type, based
739 on our first approximation. */
740 BINFO_VTABLE (TYPE_BINFO (type
)) = decl
;
741 BINFO_VIRTUALS (TYPE_BINFO (type
)) = virtuals
;
742 SET_BINFO_NEW_VTABLE_MARKED (TYPE_BINFO (type
));
746 /* Give BINFO a new virtual function table which is initialized
747 with a skeleton-copy of its original initialization. The only
748 entry that changes is the `delta' entry, so we can really
749 share a lot of structure.
751 FOR_TYPE is the most derived type which caused this table to
754 Returns nonzero if we haven't met BINFO before.
756 The order in which vtables are built (by calling this function) for
757 an object must remain the same, otherwise a binary incompatibility
761 build_secondary_vtable (tree binfo
)
763 if (BINFO_NEW_VTABLE_MARKED (binfo
))
764 /* We already created a vtable for this base. There's no need to
768 /* Remember that we've created a vtable for this BINFO, so that we
769 don't try to do so again. */
770 SET_BINFO_NEW_VTABLE_MARKED (binfo
);
772 /* Make fresh virtual list, so we can smash it later. */
773 BINFO_VIRTUALS (binfo
) = copy_list (BINFO_VIRTUALS (binfo
));
775 /* Secondary vtables are laid out as part of the same structure as
776 the primary vtable. */
777 BINFO_VTABLE (binfo
) = NULL_TREE
;
781 /* Create a new vtable for BINFO which is the hierarchy dominated by
782 T. Return nonzero if we actually created a new vtable. */
785 make_new_vtable (tree t
, tree binfo
)
787 if (binfo
== TYPE_BINFO (t
))
788 /* In this case, it is *type*'s vtable we are modifying. We start
789 with the approximation that its vtable is that of the
790 immediate base class. */
791 return build_primary_vtable (binfo
, t
);
793 /* This is our very own copy of `basetype' to play with. Later,
794 we will fill in all the virtual functions that override the
795 virtual functions in these base classes which are not defined
796 by the current type. */
797 return build_secondary_vtable (binfo
);
800 /* Make *VIRTUALS, an entry on the BINFO_VIRTUALS list for BINFO
801 (which is in the hierarchy dominated by T) list FNDECL as its
802 BV_FN. DELTA is the required constant adjustment from the `this'
803 pointer where the vtable entry appears to the `this' required when
804 the function is actually called. */
807 modify_vtable_entry (tree t
,
817 if (fndecl
!= BV_FN (v
)
818 || !tree_int_cst_equal (delta
, BV_DELTA (v
)))
820 /* We need a new vtable for BINFO. */
821 if (make_new_vtable (t
, binfo
))
823 /* If we really did make a new vtable, we also made a copy
824 of the BINFO_VIRTUALS list. Now, we have to find the
825 corresponding entry in that list. */
826 *virtuals
= BINFO_VIRTUALS (binfo
);
827 while (BV_FN (*virtuals
) != BV_FN (v
))
828 *virtuals
= TREE_CHAIN (*virtuals
);
832 BV_DELTA (v
) = delta
;
833 BV_VCALL_INDEX (v
) = NULL_TREE
;
839 /* Add method METHOD to class TYPE. */
842 add_method (tree type
, tree method
)
848 VEC(tree
) *method_vec
;
850 bool insert_p
= false;
853 if (method
== error_mark_node
)
856 complete_p
= COMPLETE_TYPE_P (type
);
857 using = (DECL_CONTEXT (method
) != type
);
858 template_conv_p
= (TREE_CODE (method
) == TEMPLATE_DECL
859 && DECL_TEMPLATE_CONV_FN_P (method
));
861 method_vec
= CLASSTYPE_METHOD_VEC (type
);
864 /* Make a new method vector. We start with 8 entries. We must
865 allocate at least two (for constructors and destructors), and
866 we're going to end up with an assignment operator at some
868 method_vec
= VEC_alloc (tree
, 8);
869 /* Create slots for constructors and destructors. */
870 VEC_quick_push (tree
, method_vec
, NULL_TREE
);
871 VEC_quick_push (tree
, method_vec
, NULL_TREE
);
872 CLASSTYPE_METHOD_VEC (type
) = method_vec
;
875 /* Constructors and destructors go in special slots. */
876 if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (method
))
877 slot
= CLASSTYPE_CONSTRUCTOR_SLOT
;
878 else if (DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P (method
))
880 slot
= CLASSTYPE_DESTRUCTOR_SLOT
;
881 TYPE_HAS_DESTRUCTOR (type
) = 1;
883 if (TYPE_FOR_JAVA (type
))
884 error (DECL_ARTIFICIAL (method
)
885 ? "Java class %qT cannot have an implicit non-trivial destructor"
886 : "Java class %qT cannot have a destructor",
887 DECL_CONTEXT (method
));
891 bool conv_p
= DECL_CONV_FN_P (method
);
895 /* See if we already have an entry with this name. */
896 for (slot
= CLASSTYPE_FIRST_CONVERSION_SLOT
;
897 VEC_iterate (tree
, method_vec
, slot
, m
);
903 if (TREE_CODE (m
) == TEMPLATE_DECL
904 && DECL_TEMPLATE_CONV_FN_P (m
))
908 if (conv_p
&& !DECL_CONV_FN_P (m
))
910 if (DECL_NAME (m
) == DECL_NAME (method
))
916 && !DECL_CONV_FN_P (m
)
917 && DECL_NAME (m
) > DECL_NAME (method
))
921 current_fns
= insert_p
? NULL_TREE
: VEC_index (tree
, method_vec
, slot
);
923 if (processing_template_decl
)
924 /* TYPE is a template class. Don't issue any errors now; wait
925 until instantiation time to complain. */
931 /* Check to see if we've already got this method. */
932 for (fns
= current_fns
; fns
; fns
= OVL_NEXT (fns
))
934 tree fn
= OVL_CURRENT (fns
);
939 if (TREE_CODE (fn
) != TREE_CODE (method
))
942 /* [over.load] Member function declarations with the
943 same name and the same parameter types cannot be
944 overloaded if any of them is a static member
945 function declaration.
947 [namespace.udecl] When a using-declaration brings names
948 from a base class into a derived class scope, member
949 functions in the derived class override and/or hide member
950 functions with the same name and parameter types in a base
951 class (rather than conflicting). */
952 parms1
= TYPE_ARG_TYPES (TREE_TYPE (fn
));
953 parms2
= TYPE_ARG_TYPES (TREE_TYPE (method
));
955 /* Compare the quals on the 'this' parm. Don't compare
956 the whole types, as used functions are treated as
957 coming from the using class in overload resolution. */
958 if (! DECL_STATIC_FUNCTION_P (fn
)
959 && ! DECL_STATIC_FUNCTION_P (method
)
960 && (TYPE_QUALS (TREE_TYPE (TREE_VALUE (parms1
)))
961 != TYPE_QUALS (TREE_TYPE (TREE_VALUE (parms2
)))))
964 /* For templates, the template parms must be identical. */
965 if (TREE_CODE (fn
) == TEMPLATE_DECL
966 && !comp_template_parms (DECL_TEMPLATE_PARMS (fn
),
967 DECL_TEMPLATE_PARMS (method
)))
970 if (! DECL_STATIC_FUNCTION_P (fn
))
971 parms1
= TREE_CHAIN (parms1
);
972 if (! DECL_STATIC_FUNCTION_P (method
))
973 parms2
= TREE_CHAIN (parms2
);
975 if (same
&& compparms (parms1
, parms2
)
976 && (!DECL_CONV_FN_P (fn
)
977 || same_type_p (TREE_TYPE (TREE_TYPE (fn
)),
978 TREE_TYPE (TREE_TYPE (method
)))))
980 if (using && DECL_CONTEXT (fn
) == type
)
981 /* Defer to the local function. */
985 cp_error_at ("`%#D' and `%#D' cannot be overloaded",
988 /* We don't call duplicate_decls here to merge
989 the declarations because that will confuse
990 things if the methods have inline
991 definitions. In particular, we will crash
992 while processing the definitions. */
999 /* Add the new binding. */
1000 overload
= build_overload (method
, current_fns
);
1002 if (slot
>= CLASSTYPE_FIRST_CONVERSION_SLOT
&& !complete_p
)
1003 push_class_level_binding (DECL_NAME (method
), overload
);
1007 /* We only expect to add few methods in the COMPLETE_P case, so
1008 just make room for one more method in that case. */
1009 if (VEC_reserve (tree
, method_vec
, complete_p
? 1 : -1))
1010 CLASSTYPE_METHOD_VEC (type
) = method_vec
;
1011 if (slot
== VEC_length (tree
, method_vec
))
1012 VEC_quick_push (tree
, method_vec
, overload
);
1014 VEC_quick_insert (tree
, method_vec
, slot
, overload
);
1017 /* Replace the current slot. */
1018 VEC_replace (tree
, method_vec
, slot
, overload
);
1021 /* Subroutines of finish_struct. */
1023 /* Change the access of FDECL to ACCESS in T. Return 1 if change was
1024 legit, otherwise return 0. */
1027 alter_access (tree t
, tree fdecl
, tree access
)
1031 if (!DECL_LANG_SPECIFIC (fdecl
))
1032 retrofit_lang_decl (fdecl
);
1034 gcc_assert (!DECL_DISCRIMINATOR_P (fdecl
));
1036 elem
= purpose_member (t
, DECL_ACCESS (fdecl
));
1039 if (TREE_VALUE (elem
) != access
)
1041 if (TREE_CODE (TREE_TYPE (fdecl
)) == FUNCTION_DECL
)
1042 cp_error_at ("conflicting access specifications for method"
1043 " %qD, ignored", TREE_TYPE (fdecl
));
1045 error ("conflicting access specifications for field %qE, ignored",
1050 /* They're changing the access to the same thing they changed
1051 it to before. That's OK. */
1057 perform_or_defer_access_check (TYPE_BINFO (t
), fdecl
);
1058 DECL_ACCESS (fdecl
) = tree_cons (t
, access
, DECL_ACCESS (fdecl
));
1064 /* Process the USING_DECL, which is a member of T. */
1067 handle_using_decl (tree using_decl
, tree t
)
1069 tree ctype
= DECL_INITIAL (using_decl
);
1070 tree name
= DECL_NAME (using_decl
);
1072 = TREE_PRIVATE (using_decl
) ? access_private_node
1073 : TREE_PROTECTED (using_decl
) ? access_protected_node
1074 : access_public_node
;
1076 tree flist
= NULL_TREE
;
1079 if (ctype
== error_mark_node
)
1082 binfo
= lookup_base (t
, ctype
, ba_any
, NULL
);
1085 location_t saved_loc
= input_location
;
1087 input_location
= DECL_SOURCE_LOCATION (using_decl
);
1088 error_not_base_type (ctype
, t
);
1089 input_location
= saved_loc
;
1093 if (constructor_name_p (name
, ctype
))
1095 cp_error_at ("%qD names constructor", using_decl
);
1098 if (constructor_name_p (name
, t
))
1100 cp_error_at ("%qD invalid in %qT", using_decl
, t
);
1104 fdecl
= lookup_member (binfo
, name
, 0, false);
1108 cp_error_at ("no members matching %qD in %q#T", using_decl
, ctype
);
1112 if (BASELINK_P (fdecl
))
1113 /* Ignore base type this came from. */
1114 fdecl
= BASELINK_FUNCTIONS (fdecl
);
1116 old_value
= lookup_member (t
, name
, /*protect=*/0, /*want_type=*/false);
1119 if (is_overloaded_fn (old_value
))
1120 old_value
= OVL_CURRENT (old_value
);
1122 if (DECL_P (old_value
) && DECL_CONTEXT (old_value
) == t
)
1125 old_value
= NULL_TREE
;
1128 if (is_overloaded_fn (fdecl
))
1133 else if (is_overloaded_fn (old_value
))
1136 /* It's OK to use functions from a base when there are functions with
1137 the same name already present in the current class. */;
1140 cp_error_at ("%qD invalid in %q#T", using_decl
, t
);
1141 cp_error_at (" because of local method %q#D with same name",
1142 OVL_CURRENT (old_value
));
1146 else if (!DECL_ARTIFICIAL (old_value
))
1148 cp_error_at ("%qD invalid in %q#T", using_decl
, t
);
1149 cp_error_at (" because of local member %q#D with same name", old_value
);
1153 /* Make type T see field decl FDECL with access ACCESS. */
1155 for (; flist
; flist
= OVL_NEXT (flist
))
1157 add_method (t
, OVL_CURRENT (flist
));
1158 alter_access (t
, OVL_CURRENT (flist
), access
);
1161 alter_access (t
, fdecl
, access
);
1164 /* Run through the base classes of T, updating
1165 CANT_HAVE_DEFAULT_CTOR_P, CANT_HAVE_CONST_CTOR_P, and
1166 NO_CONST_ASN_REF_P. Also set flag bits in T based on properties of
1170 check_bases (tree t
,
1171 int* cant_have_default_ctor_p
,
1172 int* cant_have_const_ctor_p
,
1173 int* no_const_asn_ref_p
)
1176 int seen_non_virtual_nearly_empty_base_p
;
1180 seen_non_virtual_nearly_empty_base_p
= 0;
1182 for (binfo
= TYPE_BINFO (t
), i
= 0;
1183 BINFO_BASE_ITERATE (binfo
, i
, base_binfo
); i
++)
1185 tree basetype
= TREE_TYPE (base_binfo
);
1187 gcc_assert (COMPLETE_TYPE_P (basetype
));
1189 /* Effective C++ rule 14. We only need to check TYPE_POLYMORPHIC_P
1190 here because the case of virtual functions but non-virtual
1191 dtor is handled in finish_struct_1. */
1192 if (warn_ecpp
&& ! TYPE_POLYMORPHIC_P (basetype
)
1193 && TYPE_HAS_DESTRUCTOR (basetype
))
1194 warning ("base class %q#T has a non-virtual destructor", basetype
);
1196 /* If the base class doesn't have copy constructors or
1197 assignment operators that take const references, then the
1198 derived class cannot have such a member automatically
1200 if (! TYPE_HAS_CONST_INIT_REF (basetype
))
1201 *cant_have_const_ctor_p
= 1;
1202 if (TYPE_HAS_ASSIGN_REF (basetype
)
1203 && !TYPE_HAS_CONST_ASSIGN_REF (basetype
))
1204 *no_const_asn_ref_p
= 1;
1205 /* Similarly, if the base class doesn't have a default
1206 constructor, then the derived class won't have an
1207 automatically generated default constructor. */
1208 if (TYPE_HAS_CONSTRUCTOR (basetype
)
1209 && ! TYPE_HAS_DEFAULT_CONSTRUCTOR (basetype
))
1211 *cant_have_default_ctor_p
= 1;
1212 if (! TYPE_HAS_CONSTRUCTOR (t
))
1213 pedwarn ("base %qT with only non-default constructor in class "
1214 "without a constructor",
1218 if (BINFO_VIRTUAL_P (base_binfo
))
1219 /* A virtual base does not effect nearly emptiness. */
1221 else if (CLASSTYPE_NEARLY_EMPTY_P (basetype
))
1223 if (seen_non_virtual_nearly_empty_base_p
)
1224 /* And if there is more than one nearly empty base, then the
1225 derived class is not nearly empty either. */
1226 CLASSTYPE_NEARLY_EMPTY_P (t
) = 0;
1228 /* Remember we've seen one. */
1229 seen_non_virtual_nearly_empty_base_p
= 1;
1231 else if (!is_empty_class (basetype
))
1232 /* If the base class is not empty or nearly empty, then this
1233 class cannot be nearly empty. */
1234 CLASSTYPE_NEARLY_EMPTY_P (t
) = 0;
1236 /* A lot of properties from the bases also apply to the derived
1238 TYPE_NEEDS_CONSTRUCTING (t
) |= TYPE_NEEDS_CONSTRUCTING (basetype
);
1239 TYPE_HAS_NONTRIVIAL_DESTRUCTOR (t
)
1240 |= TYPE_HAS_NONTRIVIAL_DESTRUCTOR (basetype
);
1241 TYPE_HAS_COMPLEX_ASSIGN_REF (t
)
1242 |= TYPE_HAS_COMPLEX_ASSIGN_REF (basetype
);
1243 TYPE_HAS_COMPLEX_INIT_REF (t
) |= TYPE_HAS_COMPLEX_INIT_REF (basetype
);
1244 TYPE_POLYMORPHIC_P (t
) |= TYPE_POLYMORPHIC_P (basetype
);
1245 CLASSTYPE_CONTAINS_EMPTY_CLASS_P (t
)
1246 |= CLASSTYPE_CONTAINS_EMPTY_CLASS_P (basetype
);
1250 /* Determine all the primary bases within T. Sets BINFO_PRIMARY_BASE_P for
1251 those that are primaries. Sets BINFO_LOST_PRIMARY_P for those
1252 that have had a nearly-empty virtual primary base stolen by some
1253 other base in the hierarchy. Determines CLASSTYPE_PRIMARY_BASE for
1257 determine_primary_bases (tree t
)
1260 tree primary
= NULL_TREE
;
1261 tree type_binfo
= TYPE_BINFO (t
);
1264 /* Determine the primary bases of our bases. */
1265 for (base_binfo
= TREE_CHAIN (type_binfo
); base_binfo
;
1266 base_binfo
= TREE_CHAIN (base_binfo
))
1268 tree primary
= CLASSTYPE_PRIMARY_BINFO (BINFO_TYPE (base_binfo
));
1270 /* See if we're the non-virtual primary of our inheritance
1272 if (!BINFO_VIRTUAL_P (base_binfo
))
1274 tree parent
= BINFO_INHERITANCE_CHAIN (base_binfo
);
1275 tree parent_primary
= CLASSTYPE_PRIMARY_BINFO (BINFO_TYPE (parent
));
1278 && SAME_BINFO_TYPE_P (BINFO_TYPE (base_binfo
),
1279 BINFO_TYPE (parent_primary
)))
1280 /* We are the primary binfo. */
1281 BINFO_PRIMARY_P (base_binfo
) = 1;
1283 /* Determine if we have a virtual primary base, and mark it so.
1285 if (primary
&& BINFO_VIRTUAL_P (primary
))
1287 tree this_primary
= copied_binfo (primary
, base_binfo
);
1289 if (BINFO_PRIMARY_P (this_primary
))
1290 /* Someone already claimed this base. */
1291 BINFO_LOST_PRIMARY_P (base_binfo
) = 1;
1296 BINFO_PRIMARY_P (this_primary
) = 1;
1297 BINFO_INHERITANCE_CHAIN (this_primary
) = base_binfo
;
1299 /* A virtual binfo might have been copied from within
1300 another hierarchy. As we're about to use it as a
1301 primary base, make sure the offsets match. */
1302 delta
= size_diffop (convert (ssizetype
,
1303 BINFO_OFFSET (base_binfo
)),
1305 BINFO_OFFSET (this_primary
)));
1307 propagate_binfo_offsets (this_primary
, delta
);
1312 /* First look for a dynamic direct non-virtual base. */
1313 for (i
= 0; BINFO_BASE_ITERATE (type_binfo
, i
, base_binfo
); i
++)
1315 tree basetype
= BINFO_TYPE (base_binfo
);
1317 if (TYPE_CONTAINS_VPTR_P (basetype
) && !BINFO_VIRTUAL_P (base_binfo
))
1319 primary
= base_binfo
;
1324 /* A "nearly-empty" virtual base class can be the primary base
1325 class, if no non-virtual polymorphic base can be found. Look for
1326 a nearly-empty virtual dynamic base that is not already a primary
1327 base of something in the hierarchy. If there is no such base,
1328 just pick the first nearly-empty virtual base. */
1330 for (base_binfo
= TREE_CHAIN (type_binfo
); base_binfo
;
1331 base_binfo
= TREE_CHAIN (base_binfo
))
1332 if (BINFO_VIRTUAL_P (base_binfo
)
1333 && CLASSTYPE_NEARLY_EMPTY_P (BINFO_TYPE (base_binfo
)))
1335 if (!BINFO_PRIMARY_P (base_binfo
))
1337 /* Found one that is not primary. */
1338 primary
= base_binfo
;
1342 /* Remember the first candidate. */
1343 primary
= base_binfo
;
1347 /* If we've got a primary base, use it. */
1350 tree basetype
= BINFO_TYPE (primary
);
1352 CLASSTYPE_PRIMARY_BINFO (t
) = primary
;
1353 if (BINFO_PRIMARY_P (primary
))
1354 /* We are stealing a primary base. */
1355 BINFO_LOST_PRIMARY_P (BINFO_INHERITANCE_CHAIN (primary
)) = 1;
1356 BINFO_PRIMARY_P (primary
) = 1;
1357 if (BINFO_VIRTUAL_P (primary
))
1361 BINFO_INHERITANCE_CHAIN (primary
) = type_binfo
;
1362 /* A virtual binfo might have been copied from within
1363 another hierarchy. As we're about to use it as a primary
1364 base, make sure the offsets match. */
1365 delta
= size_diffop (ssize_int (0),
1366 convert (ssizetype
, BINFO_OFFSET (primary
)));
1368 propagate_binfo_offsets (primary
, delta
);
1371 primary
= TYPE_BINFO (basetype
);
1373 TYPE_VFIELD (t
) = TYPE_VFIELD (basetype
);
1374 BINFO_VTABLE (type_binfo
) = BINFO_VTABLE (primary
);
1375 BINFO_VIRTUALS (type_binfo
) = BINFO_VIRTUALS (primary
);
1379 /* Set memoizing fields and bits of T (and its variants) for later
1383 finish_struct_bits (tree t
)
1387 /* Fix up variants (if any). */
1388 for (variants
= TYPE_NEXT_VARIANT (t
);
1390 variants
= TYPE_NEXT_VARIANT (variants
))
1392 /* These fields are in the _TYPE part of the node, not in
1393 the TYPE_LANG_SPECIFIC component, so they are not shared. */
1394 TYPE_HAS_CONSTRUCTOR (variants
) = TYPE_HAS_CONSTRUCTOR (t
);
1395 TYPE_HAS_DESTRUCTOR (variants
) = TYPE_HAS_DESTRUCTOR (t
);
1396 TYPE_NEEDS_CONSTRUCTING (variants
) = TYPE_NEEDS_CONSTRUCTING (t
);
1397 TYPE_HAS_NONTRIVIAL_DESTRUCTOR (variants
)
1398 = TYPE_HAS_NONTRIVIAL_DESTRUCTOR (t
);
1400 TYPE_POLYMORPHIC_P (variants
) = TYPE_POLYMORPHIC_P (t
);
1402 TYPE_BINFO (variants
) = TYPE_BINFO (t
);
1404 /* Copy whatever these are holding today. */
1405 TYPE_VFIELD (variants
) = TYPE_VFIELD (t
);
1406 TYPE_METHODS (variants
) = TYPE_METHODS (t
);
1407 TYPE_FIELDS (variants
) = TYPE_FIELDS (t
);
1408 TYPE_SIZE (variants
) = TYPE_SIZE (t
);
1409 TYPE_SIZE_UNIT (variants
) = TYPE_SIZE_UNIT (t
);
1412 if (BINFO_N_BASE_BINFOS (TYPE_BINFO (t
)) && TYPE_POLYMORPHIC_P (t
))
1413 /* For a class w/o baseclasses, 'finish_struct' has set
1414 CLASSTYPE_PURE_VIRTUALS correctly (by definition).
1415 Similarly for a class whose base classes do not have vtables.
1416 When neither of these is true, we might have removed abstract
1417 virtuals (by providing a definition), added some (by declaring
1418 new ones), or redeclared ones from a base class. We need to
1419 recalculate what's really an abstract virtual at this point (by
1420 looking in the vtables). */
1421 get_pure_virtuals (t
);
1423 /* If this type has a copy constructor or a destructor, force its
1424 mode to be BLKmode, and force its TREE_ADDRESSABLE bit to be
1425 nonzero. This will cause it to be passed by invisible reference
1426 and prevent it from being returned in a register. */
1427 if (! TYPE_HAS_TRIVIAL_INIT_REF (t
) || TYPE_HAS_NONTRIVIAL_DESTRUCTOR (t
))
1430 DECL_MODE (TYPE_MAIN_DECL (t
)) = BLKmode
;
1431 for (variants
= t
; variants
; variants
= TYPE_NEXT_VARIANT (variants
))
1433 TYPE_MODE (variants
) = BLKmode
;
1434 TREE_ADDRESSABLE (variants
) = 1;
1439 /* Issue warnings about T having private constructors, but no friends,
1442 HAS_NONPRIVATE_METHOD is nonzero if T has any non-private methods or
1443 static members. HAS_NONPRIVATE_STATIC_FN is nonzero if T has any
1444 non-private static member functions. */
1447 maybe_warn_about_overly_private_class (tree t
)
1449 int has_member_fn
= 0;
1450 int has_nonprivate_method
= 0;
1453 if (!warn_ctor_dtor_privacy
1454 /* If the class has friends, those entities might create and
1455 access instances, so we should not warn. */
1456 || (CLASSTYPE_FRIEND_CLASSES (t
)
1457 || DECL_FRIENDLIST (TYPE_MAIN_DECL (t
)))
1458 /* We will have warned when the template was declared; there's
1459 no need to warn on every instantiation. */
1460 || CLASSTYPE_TEMPLATE_INSTANTIATION (t
))
1461 /* There's no reason to even consider warning about this
1465 /* We only issue one warning, if more than one applies, because
1466 otherwise, on code like:
1469 // Oops - forgot `public:'
1475 we warn several times about essentially the same problem. */
1477 /* Check to see if all (non-constructor, non-destructor) member
1478 functions are private. (Since there are no friends or
1479 non-private statics, we can't ever call any of the private member
1481 for (fn
= TYPE_METHODS (t
); fn
; fn
= TREE_CHAIN (fn
))
1482 /* We're not interested in compiler-generated methods; they don't
1483 provide any way to call private members. */
1484 if (!DECL_ARTIFICIAL (fn
))
1486 if (!TREE_PRIVATE (fn
))
1488 if (DECL_STATIC_FUNCTION_P (fn
))
1489 /* A non-private static member function is just like a
1490 friend; it can create and invoke private member
1491 functions, and be accessed without a class
1495 has_nonprivate_method
= 1;
1496 /* Keep searching for a static member function. */
1498 else if (!DECL_CONSTRUCTOR_P (fn
) && !DECL_DESTRUCTOR_P (fn
))
1502 if (!has_nonprivate_method
&& has_member_fn
)
1504 /* There are no non-private methods, and there's at least one
1505 private member function that isn't a constructor or
1506 destructor. (If all the private members are
1507 constructors/destructors we want to use the code below that
1508 issues error messages specifically referring to
1509 constructors/destructors.) */
1511 tree binfo
= TYPE_BINFO (t
);
1513 for (i
= 0; i
!= BINFO_N_BASE_BINFOS (binfo
); i
++)
1514 if (BINFO_BASE_ACCESS (binfo
, i
) != access_private_node
)
1516 has_nonprivate_method
= 1;
1519 if (!has_nonprivate_method
)
1521 warning ("all member functions in class %qT are private", t
);
1526 /* Even if some of the member functions are non-private, the class
1527 won't be useful for much if all the constructors or destructors
1528 are private: such an object can never be created or destroyed. */
1529 if (TYPE_HAS_DESTRUCTOR (t
)
1530 && TREE_PRIVATE (CLASSTYPE_DESTRUCTORS (t
)))
1532 warning ("%q#T only defines a private destructor and has no friends",
1537 if (TYPE_HAS_CONSTRUCTOR (t
))
1539 int nonprivate_ctor
= 0;
1541 /* If a non-template class does not define a copy
1542 constructor, one is defined for it, enabling it to avoid
1543 this warning. For a template class, this does not
1544 happen, and so we would normally get a warning on:
1546 template <class T> class C { private: C(); };
1548 To avoid this asymmetry, we check TYPE_HAS_INIT_REF. All
1549 complete non-template or fully instantiated classes have this
1551 if (!TYPE_HAS_INIT_REF (t
))
1552 nonprivate_ctor
= 1;
1554 for (fn
= CLASSTYPE_CONSTRUCTORS (t
); fn
; fn
= OVL_NEXT (fn
))
1556 tree ctor
= OVL_CURRENT (fn
);
1557 /* Ideally, we wouldn't count copy constructors (or, in
1558 fact, any constructor that takes an argument of the
1559 class type as a parameter) because such things cannot
1560 be used to construct an instance of the class unless
1561 you already have one. But, for now at least, we're
1563 if (! TREE_PRIVATE (ctor
))
1565 nonprivate_ctor
= 1;
1570 if (nonprivate_ctor
== 0)
1572 warning ("%q#T only defines private constructors and has no friends",
1580 gt_pointer_operator new_value
;
1584 /* Comparison function to compare two TYPE_METHOD_VEC entries by name. */
1587 method_name_cmp (const void* m1_p
, const void* m2_p
)
1589 const tree
*const m1
= m1_p
;
1590 const tree
*const m2
= m2_p
;
1592 if (*m1
== NULL_TREE
&& *m2
== NULL_TREE
)
1594 if (*m1
== NULL_TREE
)
1596 if (*m2
== NULL_TREE
)
1598 if (DECL_NAME (OVL_CURRENT (*m1
)) < DECL_NAME (OVL_CURRENT (*m2
)))
1603 /* This routine compares two fields like method_name_cmp but using the
1604 pointer operator in resort_field_decl_data. */
1607 resort_method_name_cmp (const void* m1_p
, const void* m2_p
)
1609 const tree
*const m1
= m1_p
;
1610 const tree
*const m2
= m2_p
;
1611 if (*m1
== NULL_TREE
&& *m2
== NULL_TREE
)
1613 if (*m1
== NULL_TREE
)
1615 if (*m2
== NULL_TREE
)
1618 tree d1
= DECL_NAME (OVL_CURRENT (*m1
));
1619 tree d2
= DECL_NAME (OVL_CURRENT (*m2
));
1620 resort_data
.new_value (&d1
, resort_data
.cookie
);
1621 resort_data
.new_value (&d2
, resort_data
.cookie
);
1628 /* Resort TYPE_METHOD_VEC because pointers have been reordered. */
1631 resort_type_method_vec (void* obj
,
1632 void* orig_obj ATTRIBUTE_UNUSED
,
1633 gt_pointer_operator new_value
,
1636 VEC(tree
) *method_vec
= (VEC(tree
) *) obj
;
1637 int len
= VEC_length (tree
, method_vec
);
1641 /* The type conversion ops have to live at the front of the vec, so we
1643 for (slot
= CLASSTYPE_FIRST_CONVERSION_SLOT
;
1644 VEC_iterate (tree
, method_vec
, slot
, fn
);
1646 if (!DECL_CONV_FN_P (OVL_CURRENT (fn
)))
1651 resort_data
.new_value
= new_value
;
1652 resort_data
.cookie
= cookie
;
1653 qsort (VEC_address (tree
, method_vec
) + slot
, len
- slot
, sizeof (tree
),
1654 resort_method_name_cmp
);
1658 /* Warn about duplicate methods in fn_fields.
1660 Sort methods that are not special (i.e., constructors, destructors,
1661 and type conversion operators) so that we can find them faster in
1665 finish_struct_methods (tree t
)
1668 VEC(tree
) *method_vec
;
1671 method_vec
= CLASSTYPE_METHOD_VEC (t
);
1675 len
= VEC_length (tree
, method_vec
);
1677 /* Clear DECL_IN_AGGR_P for all functions. */
1678 for (fn_fields
= TYPE_METHODS (t
); fn_fields
;
1679 fn_fields
= TREE_CHAIN (fn_fields
))
1680 DECL_IN_AGGR_P (fn_fields
) = 0;
1682 if (TYPE_HAS_DESTRUCTOR (t
) && !CLASSTYPE_DESTRUCTORS (t
))
1683 /* We thought there was a destructor, but there wasn't. Some
1684 parse errors cause this anomalous situation. */
1685 TYPE_HAS_DESTRUCTOR (t
) = 0;
1687 /* Issue warnings about private constructors and such. If there are
1688 no methods, then some public defaults are generated. */
1689 maybe_warn_about_overly_private_class (t
);
1691 /* The type conversion ops have to live at the front of the vec, so we
1693 for (slot
= CLASSTYPE_FIRST_CONVERSION_SLOT
;
1694 VEC_iterate (tree
, method_vec
, slot
, fn_fields
);
1696 if (!DECL_CONV_FN_P (OVL_CURRENT (fn_fields
)))
1699 qsort (VEC_address (tree
, method_vec
) + slot
,
1700 len
-slot
, sizeof (tree
), method_name_cmp
);
1703 /* Make BINFO's vtable have N entries, including RTTI entries,
1704 vbase and vcall offsets, etc. Set its type and call the backend
1708 layout_vtable_decl (tree binfo
, int n
)
1713 atype
= build_cplus_array_type (vtable_entry_type
,
1714 build_index_type (size_int (n
- 1)));
1715 layout_type (atype
);
1717 /* We may have to grow the vtable. */
1718 vtable
= get_vtbl_decl_for_binfo (binfo
);
1719 if (!same_type_p (TREE_TYPE (vtable
), atype
))
1721 TREE_TYPE (vtable
) = atype
;
1722 DECL_SIZE (vtable
) = DECL_SIZE_UNIT (vtable
) = NULL_TREE
;
1723 layout_decl (vtable
, 0);
1727 /* True iff FNDECL and BASE_FNDECL (both non-static member functions)
1728 have the same signature. */
1731 same_signature_p (tree fndecl
, tree base_fndecl
)
1733 /* One destructor overrides another if they are the same kind of
1735 if (DECL_DESTRUCTOR_P (base_fndecl
) && DECL_DESTRUCTOR_P (fndecl
)
1736 && special_function_p (base_fndecl
) == special_function_p (fndecl
))
1738 /* But a non-destructor never overrides a destructor, nor vice
1739 versa, nor do different kinds of destructors override
1740 one-another. For example, a complete object destructor does not
1741 override a deleting destructor. */
1742 if (DECL_DESTRUCTOR_P (base_fndecl
) || DECL_DESTRUCTOR_P (fndecl
))
1745 if (DECL_NAME (fndecl
) == DECL_NAME (base_fndecl
)
1746 || (DECL_CONV_FN_P (fndecl
)
1747 && DECL_CONV_FN_P (base_fndecl
)
1748 && same_type_p (DECL_CONV_FN_TYPE (fndecl
),
1749 DECL_CONV_FN_TYPE (base_fndecl
))))
1751 tree types
, base_types
;
1752 types
= TYPE_ARG_TYPES (TREE_TYPE (fndecl
));
1753 base_types
= TYPE_ARG_TYPES (TREE_TYPE (base_fndecl
));
1754 if ((TYPE_QUALS (TREE_TYPE (TREE_VALUE (base_types
)))
1755 == TYPE_QUALS (TREE_TYPE (TREE_VALUE (types
))))
1756 && compparms (TREE_CHAIN (base_types
), TREE_CHAIN (types
)))
1762 /* Returns TRUE if DERIVED is a binfo containing the binfo BASE as a
1766 base_derived_from (tree derived
, tree base
)
1770 for (probe
= base
; probe
; probe
= BINFO_INHERITANCE_CHAIN (probe
))
1772 if (probe
== derived
)
1774 else if (BINFO_VIRTUAL_P (probe
))
1775 /* If we meet a virtual base, we can't follow the inheritance
1776 any more. See if the complete type of DERIVED contains
1777 such a virtual base. */
1778 return (binfo_for_vbase (BINFO_TYPE (probe
), BINFO_TYPE (derived
))
1784 typedef struct find_final_overrider_data_s
{
1785 /* The function for which we are trying to find a final overrider. */
1787 /* The base class in which the function was declared. */
1788 tree declaring_base
;
1789 /* The candidate overriders. */
1791 /* Path to most derived. */
1793 } find_final_overrider_data
;
1795 /* Add the overrider along the current path to FFOD->CANDIDATES.
1796 Returns true if an overrider was found; false otherwise. */
1799 dfs_find_final_overrider_1 (tree binfo
,
1800 find_final_overrider_data
*ffod
,
1805 /* If BINFO is not the most derived type, try a more derived class.
1806 A definition there will overrider a definition here. */
1810 if (dfs_find_final_overrider_1
1811 (VEC_index (tree
, ffod
->path
, depth
), ffod
, depth
))
1815 method
= look_for_overrides_here (BINFO_TYPE (binfo
), ffod
->fn
);
1818 tree
*candidate
= &ffod
->candidates
;
1820 /* Remove any candidates overridden by this new function. */
1823 /* If *CANDIDATE overrides METHOD, then METHOD
1824 cannot override anything else on the list. */
1825 if (base_derived_from (TREE_VALUE (*candidate
), binfo
))
1827 /* If METHOD overrides *CANDIDATE, remove *CANDIDATE. */
1828 if (base_derived_from (binfo
, TREE_VALUE (*candidate
)))
1829 *candidate
= TREE_CHAIN (*candidate
);
1831 candidate
= &TREE_CHAIN (*candidate
);
1834 /* Add the new function. */
1835 ffod
->candidates
= tree_cons (method
, binfo
, ffod
->candidates
);
1842 /* Called from find_final_overrider via dfs_walk. */
1845 dfs_find_final_overrider_pre (tree binfo
, void *data
)
1847 find_final_overrider_data
*ffod
= (find_final_overrider_data
*) data
;
1849 if (binfo
== ffod
->declaring_base
)
1850 dfs_find_final_overrider_1 (binfo
, ffod
, VEC_length (tree
, ffod
->path
));
1851 VEC_safe_push (tree
, ffod
->path
, binfo
);
1857 dfs_find_final_overrider_post (tree binfo ATTRIBUTE_UNUSED
, void *data
)
1859 find_final_overrider_data
*ffod
= (find_final_overrider_data
*) data
;
1860 VEC_pop (tree
, ffod
->path
);
1865 /* Returns a TREE_LIST whose TREE_PURPOSE is the final overrider for
1866 FN and whose TREE_VALUE is the binfo for the base where the
1867 overriding occurs. BINFO (in the hierarchy dominated by the binfo
1868 DERIVED) is the base object in which FN is declared. */
1871 find_final_overrider (tree derived
, tree binfo
, tree fn
)
1873 find_final_overrider_data ffod
;
1875 /* Getting this right is a little tricky. This is valid:
1877 struct S { virtual void f (); };
1878 struct T { virtual void f (); };
1879 struct U : public S, public T { };
1881 even though calling `f' in `U' is ambiguous. But,
1883 struct R { virtual void f(); };
1884 struct S : virtual public R { virtual void f (); };
1885 struct T : virtual public R { virtual void f (); };
1886 struct U : public S, public T { };
1888 is not -- there's no way to decide whether to put `S::f' or
1889 `T::f' in the vtable for `R'.
1891 The solution is to look at all paths to BINFO. If we find
1892 different overriders along any two, then there is a problem. */
1893 if (DECL_THUNK_P (fn
))
1894 fn
= THUNK_TARGET (fn
);
1896 /* Determine the depth of the hierarchy. */
1898 ffod
.declaring_base
= binfo
;
1899 ffod
.candidates
= NULL_TREE
;
1900 ffod
.path
= VEC_alloc (tree
, 30);
1902 dfs_walk_all (derived
, dfs_find_final_overrider_pre
,
1903 dfs_find_final_overrider_post
, &ffod
);
1905 VEC_free (tree
, ffod
.path
);
1907 /* If there was no winner, issue an error message. */
1908 if (!ffod
.candidates
|| TREE_CHAIN (ffod
.candidates
))
1910 error ("no unique final overrider for %qD in %qT", fn
,
1911 BINFO_TYPE (derived
));
1912 return error_mark_node
;
1915 return ffod
.candidates
;
1918 /* Return the index of the vcall offset for FN when TYPE is used as a
1922 get_vcall_index (tree fn
, tree type
)
1924 VEC (tree_pair_s
) *indices
= CLASSTYPE_VCALL_INDICES (type
);
1928 for (ix
= 0; VEC_iterate (tree_pair_s
, indices
, ix
, p
); ix
++)
1929 if ((DECL_DESTRUCTOR_P (fn
) && DECL_DESTRUCTOR_P (p
->purpose
))
1930 || same_signature_p (fn
, p
->purpose
))
1933 /* There should always be an appropriate index. */
1937 /* Update an entry in the vtable for BINFO, which is in the hierarchy
1938 dominated by T. FN has been overridden in BINFO; VIRTUALS points to the
1939 corresponding position in the BINFO_VIRTUALS list. */
1942 update_vtable_entry_for_fn (tree t
, tree binfo
, tree fn
, tree
* virtuals
,
1950 tree overrider_fn
, overrider_target
;
1951 tree target_fn
= DECL_THUNK_P (fn
) ? THUNK_TARGET (fn
) : fn
;
1952 tree over_return
, base_return
;
1955 /* Find the nearest primary base (possibly binfo itself) which defines
1956 this function; this is the class the caller will convert to when
1957 calling FN through BINFO. */
1958 for (b
= binfo
; ; b
= get_primary_binfo (b
))
1961 if (look_for_overrides_here (BINFO_TYPE (b
), target_fn
))
1964 /* The nearest definition is from a lost primary. */
1965 if (BINFO_LOST_PRIMARY_P (b
))
1970 /* Find the final overrider. */
1971 overrider
= find_final_overrider (TYPE_BINFO (t
), b
, target_fn
);
1972 if (overrider
== error_mark_node
)
1974 overrider_target
= overrider_fn
= TREE_PURPOSE (overrider
);
1976 /* Check for adjusting covariant return types. */
1977 over_return
= TREE_TYPE (TREE_TYPE (overrider_target
));
1978 base_return
= TREE_TYPE (TREE_TYPE (target_fn
));
1980 if (POINTER_TYPE_P (over_return
)
1981 && TREE_CODE (over_return
) == TREE_CODE (base_return
)
1982 && CLASS_TYPE_P (TREE_TYPE (over_return
))
1983 && CLASS_TYPE_P (TREE_TYPE (base_return
)))
1985 /* If FN is a covariant thunk, we must figure out the adjustment
1986 to the final base FN was converting to. As OVERRIDER_TARGET might
1987 also be converting to the return type of FN, we have to
1988 combine the two conversions here. */
1989 tree fixed_offset
, virtual_offset
;
1991 if (DECL_THUNK_P (fn
))
1993 gcc_assert (DECL_RESULT_THUNK_P (fn
));
1994 fixed_offset
= ssize_int (THUNK_FIXED_OFFSET (fn
));
1995 virtual_offset
= THUNK_VIRTUAL_OFFSET (fn
);
1998 fixed_offset
= virtual_offset
= NULL_TREE
;
2001 /* Find the equivalent binfo within the return type of the
2002 overriding function. We will want the vbase offset from
2004 virtual_offset
= binfo_for_vbase (BINFO_TYPE (virtual_offset
),
2005 TREE_TYPE (over_return
));
2006 else if (!same_type_p (TREE_TYPE (over_return
),
2007 TREE_TYPE (base_return
)))
2009 /* There was no existing virtual thunk (which takes
2014 thunk_binfo
= lookup_base (TREE_TYPE (over_return
),
2015 TREE_TYPE (base_return
),
2016 ba_check
| ba_quiet
, &kind
);
2018 if (thunk_binfo
&& (kind
== bk_via_virtual
2019 || !BINFO_OFFSET_ZEROP (thunk_binfo
)))
2021 tree offset
= convert (ssizetype
, BINFO_OFFSET (thunk_binfo
));
2023 if (kind
== bk_via_virtual
)
2025 /* We convert via virtual base. Find the virtual
2026 base and adjust the fixed offset to be from there. */
2027 while (!BINFO_VIRTUAL_P (thunk_binfo
))
2028 thunk_binfo
= BINFO_INHERITANCE_CHAIN (thunk_binfo
);
2030 virtual_offset
= thunk_binfo
;
2031 offset
= size_diffop
2033 (ssizetype
, BINFO_OFFSET (virtual_offset
)));
2036 /* There was an existing fixed offset, this must be
2037 from the base just converted to, and the base the
2038 FN was thunking to. */
2039 fixed_offset
= size_binop (PLUS_EXPR
, fixed_offset
, offset
);
2041 fixed_offset
= offset
;
2045 if (fixed_offset
|| virtual_offset
)
2046 /* Replace the overriding function with a covariant thunk. We
2047 will emit the overriding function in its own slot as
2049 overrider_fn
= make_thunk (overrider_target
, /*this_adjusting=*/0,
2050 fixed_offset
, virtual_offset
);
2053 gcc_assert (!DECL_THUNK_P (fn
));
2055 /* Assume that we will produce a thunk that convert all the way to
2056 the final overrider, and not to an intermediate virtual base. */
2057 virtual_base
= NULL_TREE
;
2059 /* See if we can convert to an intermediate virtual base first, and then
2060 use the vcall offset located there to finish the conversion. */
2061 for (; b
; b
= BINFO_INHERITANCE_CHAIN (b
))
2063 /* If we find the final overrider, then we can stop
2065 if (SAME_BINFO_TYPE_P (BINFO_TYPE (b
),
2066 BINFO_TYPE (TREE_VALUE (overrider
))))
2069 /* If we find a virtual base, and we haven't yet found the
2070 overrider, then there is a virtual base between the
2071 declaring base (first_defn) and the final overrider. */
2072 if (BINFO_VIRTUAL_P (b
))
2079 if (overrider_fn
!= overrider_target
&& !virtual_base
)
2081 /* The ABI specifies that a covariant thunk includes a mangling
2082 for a this pointer adjustment. This-adjusting thunks that
2083 override a function from a virtual base have a vcall
2084 adjustment. When the virtual base in question is a primary
2085 virtual base, we know the adjustments are zero, (and in the
2086 non-covariant case, we would not use the thunk).
2087 Unfortunately we didn't notice this could happen, when
2088 designing the ABI and so never mandated that such a covariant
2089 thunk should be emitted. Because we must use the ABI mandated
2090 name, we must continue searching from the binfo where we
2091 found the most recent definition of the function, towards the
2092 primary binfo which first introduced the function into the
2093 vtable. If that enters a virtual base, we must use a vcall
2094 this-adjusting thunk. Bleah! */
2095 tree probe
= first_defn
;
2097 while ((probe
= get_primary_binfo (probe
))
2098 && (unsigned) list_length (BINFO_VIRTUALS (probe
)) > ix
)
2099 if (BINFO_VIRTUAL_P (probe
))
2100 virtual_base
= probe
;
2103 /* Even if we find a virtual base, the correct delta is
2104 between the overrider and the binfo we're building a vtable
2106 goto virtual_covariant
;
2109 /* Compute the constant adjustment to the `this' pointer. The
2110 `this' pointer, when this function is called, will point at BINFO
2111 (or one of its primary bases, which are at the same offset). */
2113 /* The `this' pointer needs to be adjusted from the declaration to
2114 the nearest virtual base. */
2115 delta
= size_diffop (convert (ssizetype
, BINFO_OFFSET (virtual_base
)),
2116 convert (ssizetype
, BINFO_OFFSET (first_defn
)));
2118 /* If the nearest definition is in a lost primary, we don't need an
2119 entry in our vtable. Except possibly in a constructor vtable,
2120 if we happen to get our primary back. In that case, the offset
2121 will be zero, as it will be a primary base. */
2122 delta
= size_zero_node
;
2124 /* The `this' pointer needs to be adjusted from pointing to
2125 BINFO to pointing at the base where the final overrider
2128 delta
= size_diffop (convert (ssizetype
,
2129 BINFO_OFFSET (TREE_VALUE (overrider
))),
2130 convert (ssizetype
, BINFO_OFFSET (binfo
)));
2132 modify_vtable_entry (t
, binfo
, overrider_fn
, delta
, virtuals
);
2135 BV_VCALL_INDEX (*virtuals
)
2136 = get_vcall_index (overrider_target
, BINFO_TYPE (virtual_base
));
2138 BV_VCALL_INDEX (*virtuals
) = NULL_TREE
;
2141 /* Called from modify_all_vtables via dfs_walk. */
2144 dfs_modify_vtables (tree binfo
, void* data
)
2146 tree t
= (tree
) data
;
2151 if (!TYPE_CONTAINS_VPTR_P (BINFO_TYPE (binfo
)))
2152 /* A base without a vtable needs no modification, and its bases
2153 are uninteresting. */
2154 return dfs_skip_bases
;
2156 if (SAME_BINFO_TYPE_P (BINFO_TYPE (binfo
), t
)
2157 && !CLASSTYPE_HAS_PRIMARY_BASE_P (t
))
2158 /* Don't do the primary vtable, if it's new. */
2161 if (BINFO_PRIMARY_P (binfo
) && !BINFO_VIRTUAL_P (binfo
))
2162 /* There's no need to modify the vtable for a non-virtual primary
2163 base; we're not going to use that vtable anyhow. We do still
2164 need to do this for virtual primary bases, as they could become
2165 non-primary in a construction vtable. */
2168 make_new_vtable (t
, binfo
);
2170 /* Now, go through each of the virtual functions in the virtual
2171 function table for BINFO. Find the final overrider, and update
2172 the BINFO_VIRTUALS list appropriately. */
2173 for (ix
= 0, virtuals
= BINFO_VIRTUALS (binfo
),
2174 old_virtuals
= BINFO_VIRTUALS (TYPE_BINFO (BINFO_TYPE (binfo
)));
2176 ix
++, virtuals
= TREE_CHAIN (virtuals
),
2177 old_virtuals
= TREE_CHAIN (old_virtuals
))
2178 update_vtable_entry_for_fn (t
,
2180 BV_FN (old_virtuals
),
2186 /* Update all of the primary and secondary vtables for T. Create new
2187 vtables as required, and initialize their RTTI information. Each
2188 of the functions in VIRTUALS is declared in T and may override a
2189 virtual function from a base class; find and modify the appropriate
2190 entries to point to the overriding functions. Returns a list, in
2191 declaration order, of the virtual functions that are declared in T,
2192 but do not appear in the primary base class vtable, and which
2193 should therefore be appended to the end of the vtable for T. */
2196 modify_all_vtables (tree t
, tree virtuals
)
2198 tree binfo
= TYPE_BINFO (t
);
2201 /* Update all of the vtables. */
2202 dfs_walk_once (binfo
, dfs_modify_vtables
, NULL
, t
);
2204 /* Add virtual functions not already in our primary vtable. These
2205 will be both those introduced by this class, and those overridden
2206 from secondary bases. It does not include virtuals merely
2207 inherited from secondary bases. */
2208 for (fnsp
= &virtuals
; *fnsp
; )
2210 tree fn
= TREE_VALUE (*fnsp
);
2212 if (!value_member (fn
, BINFO_VIRTUALS (binfo
))
2213 || DECL_VINDEX (fn
) == error_mark_node
)
2215 /* We don't need to adjust the `this' pointer when
2216 calling this function. */
2217 BV_DELTA (*fnsp
) = integer_zero_node
;
2218 BV_VCALL_INDEX (*fnsp
) = NULL_TREE
;
2220 /* This is a function not already in our vtable. Keep it. */
2221 fnsp
= &TREE_CHAIN (*fnsp
);
2224 /* We've already got an entry for this function. Skip it. */
2225 *fnsp
= TREE_CHAIN (*fnsp
);
2231 /* Get the base virtual function declarations in T that have the
2235 get_basefndecls (tree name
, tree t
)
2238 tree base_fndecls
= NULL_TREE
;
2239 int n_baseclasses
= BINFO_N_BASE_BINFOS (TYPE_BINFO (t
));
2242 /* Find virtual functions in T with the indicated NAME. */
2243 i
= lookup_fnfields_1 (t
, name
);
2245 for (methods
= VEC_index (tree
, CLASSTYPE_METHOD_VEC (t
), i
);
2247 methods
= OVL_NEXT (methods
))
2249 tree method
= OVL_CURRENT (methods
);
2251 if (TREE_CODE (method
) == FUNCTION_DECL
2252 && DECL_VINDEX (method
))
2253 base_fndecls
= tree_cons (NULL_TREE
, method
, base_fndecls
);
2257 return base_fndecls
;
2259 for (i
= 0; i
< n_baseclasses
; i
++)
2261 tree basetype
= BINFO_TYPE (BINFO_BASE_BINFO (TYPE_BINFO (t
), i
));
2262 base_fndecls
= chainon (get_basefndecls (name
, basetype
),
2266 return base_fndecls
;
2269 /* If this declaration supersedes the declaration of
2270 a method declared virtual in the base class, then
2271 mark this field as being virtual as well. */
2274 check_for_override (tree decl
, tree ctype
)
2276 if (TREE_CODE (decl
) == TEMPLATE_DECL
)
2277 /* In [temp.mem] we have:
2279 A specialization of a member function template does not
2280 override a virtual function from a base class. */
2282 if ((DECL_DESTRUCTOR_P (decl
)
2283 || IDENTIFIER_VIRTUAL_P (DECL_NAME (decl
))
2284 || DECL_CONV_FN_P (decl
))
2285 && look_for_overrides (ctype
, decl
)
2286 && !DECL_STATIC_FUNCTION_P (decl
))
2287 /* Set DECL_VINDEX to a value that is neither an INTEGER_CST nor
2288 the error_mark_node so that we know it is an overriding
2290 DECL_VINDEX (decl
) = decl
;
2292 if (DECL_VIRTUAL_P (decl
))
2294 if (!DECL_VINDEX (decl
))
2295 DECL_VINDEX (decl
) = error_mark_node
;
2296 IDENTIFIER_VIRTUAL_P (DECL_NAME (decl
)) = 1;
2300 /* Warn about hidden virtual functions that are not overridden in t.
2301 We know that constructors and destructors don't apply. */
2304 warn_hidden (tree t
)
2306 VEC(tree
) *method_vec
= CLASSTYPE_METHOD_VEC (t
);
2310 /* We go through each separately named virtual function. */
2311 for (i
= CLASSTYPE_FIRST_CONVERSION_SLOT
;
2312 VEC_iterate (tree
, method_vec
, i
, fns
);
2323 /* All functions in this slot in the CLASSTYPE_METHOD_VEC will
2324 have the same name. Figure out what name that is. */
2325 name
= DECL_NAME (OVL_CURRENT (fns
));
2326 /* There are no possibly hidden functions yet. */
2327 base_fndecls
= NULL_TREE
;
2328 /* Iterate through all of the base classes looking for possibly
2329 hidden functions. */
2330 for (binfo
= TYPE_BINFO (t
), j
= 0;
2331 BINFO_BASE_ITERATE (binfo
, j
, base_binfo
); j
++)
2333 tree basetype
= BINFO_TYPE (base_binfo
);
2334 base_fndecls
= chainon (get_basefndecls (name
, basetype
),
2338 /* If there are no functions to hide, continue. */
2342 /* Remove any overridden functions. */
2343 for (fn
= fns
; fn
; fn
= OVL_NEXT (fn
))
2345 fndecl
= OVL_CURRENT (fn
);
2346 if (DECL_VINDEX (fndecl
))
2348 tree
*prev
= &base_fndecls
;
2351 /* If the method from the base class has the same
2352 signature as the method from the derived class, it
2353 has been overridden. */
2354 if (same_signature_p (fndecl
, TREE_VALUE (*prev
)))
2355 *prev
= TREE_CHAIN (*prev
);
2357 prev
= &TREE_CHAIN (*prev
);
2361 /* Now give a warning for all base functions without overriders,
2362 as they are hidden. */
2363 while (base_fndecls
)
2365 /* Here we know it is a hider, and no overrider exists. */
2366 cp_warning_at ("%qD was hidden", TREE_VALUE (base_fndecls
));
2367 cp_warning_at (" by %qD", fns
);
2368 base_fndecls
= TREE_CHAIN (base_fndecls
);
2373 /* Check for things that are invalid. There are probably plenty of other
2374 things we should check for also. */
2377 finish_struct_anon (tree t
)
2381 for (field
= TYPE_FIELDS (t
); field
; field
= TREE_CHAIN (field
))
2383 if (TREE_STATIC (field
))
2385 if (TREE_CODE (field
) != FIELD_DECL
)
2388 if (DECL_NAME (field
) == NULL_TREE
2389 && ANON_AGGR_TYPE_P (TREE_TYPE (field
)))
2391 tree elt
= TYPE_FIELDS (TREE_TYPE (field
));
2392 for (; elt
; elt
= TREE_CHAIN (elt
))
2394 /* We're generally only interested in entities the user
2395 declared, but we also find nested classes by noticing
2396 the TYPE_DECL that we create implicitly. You're
2397 allowed to put one anonymous union inside another,
2398 though, so we explicitly tolerate that. We use
2399 TYPE_ANONYMOUS_P rather than ANON_AGGR_TYPE_P so that
2400 we also allow unnamed types used for defining fields. */
2401 if (DECL_ARTIFICIAL (elt
)
2402 && (!DECL_IMPLICIT_TYPEDEF_P (elt
)
2403 || TYPE_ANONYMOUS_P (TREE_TYPE (elt
))))
2406 if (TREE_CODE (elt
) != FIELD_DECL
)
2408 cp_pedwarn_at ("%q#D invalid; an anonymous union can "
2409 "only have non-static data members",
2414 if (TREE_PRIVATE (elt
))
2415 cp_pedwarn_at ("private member %q#D in anonymous union",
2417 else if (TREE_PROTECTED (elt
))
2418 cp_pedwarn_at ("protected member %q#D in anonymous union",
2421 TREE_PRIVATE (elt
) = TREE_PRIVATE (field
);
2422 TREE_PROTECTED (elt
) = TREE_PROTECTED (field
);
2428 /* Add T to CLASSTYPE_DECL_LIST of current_class_type which
2429 will be used later during class template instantiation.
2430 When FRIEND_P is zero, T can be a static member data (VAR_DECL),
2431 a non-static member data (FIELD_DECL), a member function
2432 (FUNCTION_DECL), a nested type (RECORD_TYPE, ENUM_TYPE),
2433 a typedef (TYPE_DECL) or a member class template (TEMPLATE_DECL)
2434 When FRIEND_P is nonzero, T is either a friend class
2435 (RECORD_TYPE, TEMPLATE_DECL) or a friend function
2436 (FUNCTION_DECL, TEMPLATE_DECL). */
2439 maybe_add_class_template_decl_list (tree type
, tree t
, int friend_p
)
2441 /* Save some memory by not creating TREE_LIST if TYPE is not template. */
2442 if (CLASSTYPE_TEMPLATE_INFO (type
))
2443 CLASSTYPE_DECL_LIST (type
)
2444 = tree_cons (friend_p
? NULL_TREE
: type
,
2445 t
, CLASSTYPE_DECL_LIST (type
));
2448 /* Create default constructors, assignment operators, and so forth for
2449 the type indicated by T, if they are needed.
2450 CANT_HAVE_DEFAULT_CTOR, CANT_HAVE_CONST_CTOR, and
2451 CANT_HAVE_CONST_ASSIGNMENT are nonzero if, for whatever reason, the
2452 class cannot have a default constructor, copy constructor taking a
2453 const reference argument, or an assignment operator taking a const
2454 reference, respectively. If a virtual destructor is created, its
2455 DECL is returned; otherwise the return value is NULL_TREE. */
2458 add_implicitly_declared_members (tree t
,
2459 int cant_have_default_ctor
,
2460 int cant_have_const_cctor
,
2461 int cant_have_const_assignment
)
2464 tree implicit_fns
= NULL_TREE
;
2465 tree virtual_dtor
= NULL_TREE
;
2469 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (t
) && !TYPE_HAS_DESTRUCTOR (t
))
2471 default_fn
= implicitly_declare_fn (sfk_destructor
, t
, /*const_p=*/0);
2472 check_for_override (default_fn
, t
);
2474 /* If we couldn't make it work, then pretend we didn't need it. */
2475 if (default_fn
== void_type_node
)
2476 TYPE_HAS_NONTRIVIAL_DESTRUCTOR (t
) = 0;
2479 TREE_CHAIN (default_fn
) = implicit_fns
;
2480 implicit_fns
= default_fn
;
2482 if (DECL_VINDEX (default_fn
))
2483 virtual_dtor
= default_fn
;
2487 /* Any non-implicit destructor is non-trivial. */
2488 TYPE_HAS_NONTRIVIAL_DESTRUCTOR (t
) |= TYPE_HAS_DESTRUCTOR (t
);
2490 /* Default constructor. */
2491 if (! TYPE_HAS_CONSTRUCTOR (t
) && ! cant_have_default_ctor
)
2493 TYPE_HAS_DEFAULT_CONSTRUCTOR (t
) = 1;
2494 CLASSTYPE_LAZY_DEFAULT_CTOR (t
) = 1;
2497 /* Copy constructor. */
2498 if (! TYPE_HAS_INIT_REF (t
) && ! TYPE_FOR_JAVA (t
))
2500 TYPE_HAS_INIT_REF (t
) = 1;
2501 TYPE_HAS_CONST_INIT_REF (t
) = !cant_have_const_cctor
;
2502 CLASSTYPE_LAZY_COPY_CTOR (t
) = 1;
2503 TYPE_HAS_CONSTRUCTOR (t
) = 1;
2506 /* If there is no assignment operator, one will be created if and
2507 when it is needed. For now, just record whether or not the type
2508 of the parameter to the assignment operator will be a const or
2509 non-const reference. */
2510 if (!TYPE_HAS_ASSIGN_REF (t
) && !TYPE_FOR_JAVA (t
))
2512 TYPE_HAS_ASSIGN_REF (t
) = 1;
2513 TYPE_HAS_CONST_ASSIGN_REF (t
) = !cant_have_const_assignment
;
2514 CLASSTYPE_LAZY_ASSIGNMENT_OP (t
) = 1;
2517 /* Now, hook all of the new functions on to TYPE_METHODS,
2518 and add them to the CLASSTYPE_METHOD_VEC. */
2519 for (f
= &implicit_fns
; *f
; f
= &TREE_CHAIN (*f
))
2522 maybe_add_class_template_decl_list (current_class_type
, *f
, /*friend_p=*/0);
2524 if (abi_version_at_least (2))
2525 /* G++ 3.2 put the implicit destructor at the *beginning* of the
2526 list, which cause the destructor to be emitted in an incorrect
2527 location in the vtable. */
2528 TYPE_METHODS (t
) = chainon (TYPE_METHODS (t
), implicit_fns
);
2531 if (warn_abi
&& virtual_dtor
)
2532 warning ("vtable layout for class %qT may not be ABI-compliant "
2533 "and may change in a future version of GCC due to implicit "
2534 "virtual destructor",
2536 *f
= TYPE_METHODS (t
);
2537 TYPE_METHODS (t
) = implicit_fns
;
2541 /* Subroutine of finish_struct_1. Recursively count the number of fields
2542 in TYPE, including anonymous union members. */
2545 count_fields (tree fields
)
2549 for (x
= fields
; x
; x
= TREE_CHAIN (x
))
2551 if (TREE_CODE (x
) == FIELD_DECL
&& ANON_AGGR_TYPE_P (TREE_TYPE (x
)))
2552 n_fields
+= count_fields (TYPE_FIELDS (TREE_TYPE (x
)));
2559 /* Subroutine of finish_struct_1. Recursively add all the fields in the
2560 TREE_LIST FIELDS to the SORTED_FIELDS_TYPE elts, starting at offset IDX. */
2563 add_fields_to_record_type (tree fields
, struct sorted_fields_type
*field_vec
, int idx
)
2566 for (x
= fields
; x
; x
= TREE_CHAIN (x
))
2568 if (TREE_CODE (x
) == FIELD_DECL
&& ANON_AGGR_TYPE_P (TREE_TYPE (x
)))
2569 idx
= add_fields_to_record_type (TYPE_FIELDS (TREE_TYPE (x
)), field_vec
, idx
);
2571 field_vec
->elts
[idx
++] = x
;
2576 /* FIELD is a bit-field. We are finishing the processing for its
2577 enclosing type. Issue any appropriate messages and set appropriate
2581 check_bitfield_decl (tree field
)
2583 tree type
= TREE_TYPE (field
);
2586 /* Detect invalid bit-field type. */
2587 if (DECL_INITIAL (field
)
2588 && ! INTEGRAL_TYPE_P (TREE_TYPE (field
)))
2590 cp_error_at ("bit-field %q#D with non-integral type", field
);
2591 w
= error_mark_node
;
2594 /* Detect and ignore out of range field width. */
2595 if (DECL_INITIAL (field
))
2597 w
= DECL_INITIAL (field
);
2599 /* Avoid the non_lvalue wrapper added by fold for PLUS_EXPRs. */
2602 /* detect invalid field size. */
2603 if (TREE_CODE (w
) == CONST_DECL
)
2604 w
= DECL_INITIAL (w
);
2606 w
= decl_constant_value (w
);
2608 if (TREE_CODE (w
) != INTEGER_CST
)
2610 cp_error_at ("bit-field %qD width not an integer constant",
2612 w
= error_mark_node
;
2614 else if (tree_int_cst_sgn (w
) < 0)
2616 cp_error_at ("negative width in bit-field %qD", field
);
2617 w
= error_mark_node
;
2619 else if (integer_zerop (w
) && DECL_NAME (field
) != 0)
2621 cp_error_at ("zero width for bit-field %qD", field
);
2622 w
= error_mark_node
;
2624 else if (compare_tree_int (w
, TYPE_PRECISION (type
)) > 0
2625 && TREE_CODE (type
) != ENUMERAL_TYPE
2626 && TREE_CODE (type
) != BOOLEAN_TYPE
)
2627 cp_warning_at ("width of %qD exceeds its type", field
);
2628 else if (TREE_CODE (type
) == ENUMERAL_TYPE
2629 && (0 > compare_tree_int (w
,
2630 min_precision (TYPE_MIN_VALUE (type
),
2631 TYPE_UNSIGNED (type
)))
2632 || 0 > compare_tree_int (w
,
2634 (TYPE_MAX_VALUE (type
),
2635 TYPE_UNSIGNED (type
)))))
2636 cp_warning_at ("%qD is too small to hold all values of %q#T",
2640 /* Remove the bit-field width indicator so that the rest of the
2641 compiler does not treat that value as an initializer. */
2642 DECL_INITIAL (field
) = NULL_TREE
;
2644 if (w
!= error_mark_node
)
2646 DECL_SIZE (field
) = convert (bitsizetype
, w
);
2647 DECL_BIT_FIELD (field
) = 1;
2651 /* Non-bit-fields are aligned for their type. */
2652 DECL_BIT_FIELD (field
) = 0;
2653 CLEAR_DECL_C_BIT_FIELD (field
);
2657 /* FIELD is a non bit-field. We are finishing the processing for its
2658 enclosing type T. Issue any appropriate messages and set appropriate
2662 check_field_decl (tree field
,
2664 int* cant_have_const_ctor
,
2665 int* cant_have_default_ctor
,
2666 int* no_const_asn_ref
,
2667 int* any_default_members
)
2669 tree type
= strip_array_types (TREE_TYPE (field
));
2671 /* An anonymous union cannot contain any fields which would change
2672 the settings of CANT_HAVE_CONST_CTOR and friends. */
2673 if (ANON_UNION_TYPE_P (type
))
2675 /* And, we don't set TYPE_HAS_CONST_INIT_REF, etc., for anonymous
2676 structs. So, we recurse through their fields here. */
2677 else if (ANON_AGGR_TYPE_P (type
))
2681 for (fields
= TYPE_FIELDS (type
); fields
; fields
= TREE_CHAIN (fields
))
2682 if (TREE_CODE (fields
) == FIELD_DECL
&& !DECL_C_BIT_FIELD (field
))
2683 check_field_decl (fields
, t
, cant_have_const_ctor
,
2684 cant_have_default_ctor
, no_const_asn_ref
,
2685 any_default_members
);
2687 /* Check members with class type for constructors, destructors,
2689 else if (CLASS_TYPE_P (type
))
2691 /* Never let anything with uninheritable virtuals
2692 make it through without complaint. */
2693 abstract_virtuals_error (field
, type
);
2695 if (TREE_CODE (t
) == UNION_TYPE
)
2697 if (TYPE_NEEDS_CONSTRUCTING (type
))
2698 cp_error_at ("member %q#D with constructor not allowed in union",
2700 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type
))
2701 cp_error_at ("member %q#D with destructor not allowed in union",
2703 if (TYPE_HAS_COMPLEX_ASSIGN_REF (type
))
2704 cp_error_at ("member %q#D with copy assignment operator not allowed in union",
2709 TYPE_NEEDS_CONSTRUCTING (t
) |= TYPE_NEEDS_CONSTRUCTING (type
);
2710 TYPE_HAS_NONTRIVIAL_DESTRUCTOR (t
)
2711 |= TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type
);
2712 TYPE_HAS_COMPLEX_ASSIGN_REF (t
) |= TYPE_HAS_COMPLEX_ASSIGN_REF (type
);
2713 TYPE_HAS_COMPLEX_INIT_REF (t
) |= TYPE_HAS_COMPLEX_INIT_REF (type
);
2716 if (!TYPE_HAS_CONST_INIT_REF (type
))
2717 *cant_have_const_ctor
= 1;
2719 if (!TYPE_HAS_CONST_ASSIGN_REF (type
))
2720 *no_const_asn_ref
= 1;
2722 if (TYPE_HAS_CONSTRUCTOR (type
)
2723 && ! TYPE_HAS_DEFAULT_CONSTRUCTOR (type
))
2724 *cant_have_default_ctor
= 1;
2726 if (DECL_INITIAL (field
) != NULL_TREE
)
2728 /* `build_class_init_list' does not recognize
2730 if (TREE_CODE (t
) == UNION_TYPE
&& any_default_members
!= 0)
2731 error ("multiple fields in union %qT initialized", t
);
2732 *any_default_members
= 1;
2736 /* Check the data members (both static and non-static), class-scoped
2737 typedefs, etc., appearing in the declaration of T. Issue
2738 appropriate diagnostics. Sets ACCESS_DECLS to a list (in
2739 declaration order) of access declarations; each TREE_VALUE in this
2740 list is a USING_DECL.
2742 In addition, set the following flags:
2745 The class is empty, i.e., contains no non-static data members.
2747 CANT_HAVE_DEFAULT_CTOR_P
2748 This class cannot have an implicitly generated default
2751 CANT_HAVE_CONST_CTOR_P
2752 This class cannot have an implicitly generated copy constructor
2753 taking a const reference.
2755 CANT_HAVE_CONST_ASN_REF
2756 This class cannot have an implicitly generated assignment
2757 operator taking a const reference.
2759 All of these flags should be initialized before calling this
2762 Returns a pointer to the end of the TYPE_FIELDs chain; additional
2763 fields can be added by adding to this chain. */
2766 check_field_decls (tree t
, tree
*access_decls
,
2767 int *cant_have_default_ctor_p
,
2768 int *cant_have_const_ctor_p
,
2769 int *no_const_asn_ref_p
)
2774 int any_default_members
;
2776 /* Assume there are no access declarations. */
2777 *access_decls
= NULL_TREE
;
2778 /* Assume this class has no pointer members. */
2779 has_pointers
= false;
2780 /* Assume none of the members of this class have default
2782 any_default_members
= 0;
2784 for (field
= &TYPE_FIELDS (t
); *field
; field
= next
)
2787 tree type
= TREE_TYPE (x
);
2789 next
= &TREE_CHAIN (x
);
2791 if (TREE_CODE (x
) == FIELD_DECL
)
2793 if (TYPE_PACKED (t
))
2795 if (!pod_type_p (TREE_TYPE (x
)) && !TYPE_PACKED (TREE_TYPE (x
)))
2797 ("ignoring packed attribute on unpacked non-POD field %q#D",
2800 DECL_PACKED (x
) = 1;
2803 if (DECL_C_BIT_FIELD (x
) && integer_zerop (DECL_INITIAL (x
)))
2804 /* We don't treat zero-width bitfields as making a class
2811 /* The class is non-empty. */
2812 CLASSTYPE_EMPTY_P (t
) = 0;
2813 /* The class is not even nearly empty. */
2814 CLASSTYPE_NEARLY_EMPTY_P (t
) = 0;
2815 /* If one of the data members contains an empty class,
2817 element_type
= strip_array_types (type
);
2818 if (CLASS_TYPE_P (element_type
)
2819 && CLASSTYPE_CONTAINS_EMPTY_CLASS_P (element_type
))
2820 CLASSTYPE_CONTAINS_EMPTY_CLASS_P (t
) = 1;
2824 if (TREE_CODE (x
) == USING_DECL
)
2826 /* Prune the access declaration from the list of fields. */
2827 *field
= TREE_CHAIN (x
);
2829 /* Save the access declarations for our caller. */
2830 *access_decls
= tree_cons (NULL_TREE
, x
, *access_decls
);
2832 /* Since we've reset *FIELD there's no reason to skip to the
2838 if (TREE_CODE (x
) == TYPE_DECL
2839 || TREE_CODE (x
) == TEMPLATE_DECL
)
2842 /* If we've gotten this far, it's a data member, possibly static,
2843 or an enumerator. */
2844 DECL_CONTEXT (x
) = t
;
2846 /* When this goes into scope, it will be a non-local reference. */
2847 DECL_NONLOCAL (x
) = 1;
2849 if (TREE_CODE (t
) == UNION_TYPE
)
2853 If a union contains a static data member, or a member of
2854 reference type, the program is ill-formed. */
2855 if (TREE_CODE (x
) == VAR_DECL
)
2857 cp_error_at ("%qD may not be static because it is a member of a union", x
);
2860 if (TREE_CODE (type
) == REFERENCE_TYPE
)
2862 cp_error_at ("%qD may not have reference type `%T' because it is a member of a union",
2868 /* ``A local class cannot have static data members.'' ARM 9.4 */
2869 if (current_function_decl
&& TREE_STATIC (x
))
2870 cp_error_at ("field %qD in local class cannot be static", x
);
2872 /* Perform error checking that did not get done in
2874 if (TREE_CODE (type
) == FUNCTION_TYPE
)
2876 cp_error_at ("field %qD invalidly declared function type", x
);
2877 type
= build_pointer_type (type
);
2878 TREE_TYPE (x
) = type
;
2880 else if (TREE_CODE (type
) == METHOD_TYPE
)
2882 cp_error_at ("field %qD invalidly declared method type", x
);
2883 type
= build_pointer_type (type
);
2884 TREE_TYPE (x
) = type
;
2887 if (type
== error_mark_node
)
2890 if (TREE_CODE (x
) == CONST_DECL
|| TREE_CODE (x
) == VAR_DECL
)
2893 /* Now it can only be a FIELD_DECL. */
2895 if (TREE_PRIVATE (x
) || TREE_PROTECTED (x
))
2896 CLASSTYPE_NON_AGGREGATE (t
) = 1;
2898 /* If this is of reference type, check if it needs an init.
2899 Also do a little ANSI jig if necessary. */
2900 if (TREE_CODE (type
) == REFERENCE_TYPE
)
2902 CLASSTYPE_NON_POD_P (t
) = 1;
2903 if (DECL_INITIAL (x
) == NULL_TREE
)
2904 SET_CLASSTYPE_REF_FIELDS_NEED_INIT (t
, 1);
2906 /* ARM $12.6.2: [A member initializer list] (or, for an
2907 aggregate, initialization by a brace-enclosed list) is the
2908 only way to initialize nonstatic const and reference
2910 *cant_have_default_ctor_p
= 1;
2911 TYPE_HAS_COMPLEX_ASSIGN_REF (t
) = 1;
2913 if (! TYPE_HAS_CONSTRUCTOR (t
) && CLASSTYPE_NON_AGGREGATE (t
)
2915 cp_warning_at ("non-static reference %q#D in class without a constructor", x
);
2918 type
= strip_array_types (type
);
2920 /* This is used by -Weffc++ (see below). Warn only for pointers
2921 to members which might hold dynamic memory. So do not warn
2922 for pointers to functions or pointers to members. */
2923 if (TYPE_PTR_P (type
)
2924 && !TYPE_PTRFN_P (type
)
2925 && !TYPE_PTR_TO_MEMBER_P (type
))
2926 has_pointers
= true;
2928 if (CLASS_TYPE_P (type
))
2930 if (CLASSTYPE_REF_FIELDS_NEED_INIT (type
))
2931 SET_CLASSTYPE_REF_FIELDS_NEED_INIT (t
, 1);
2932 if (CLASSTYPE_READONLY_FIELDS_NEED_INIT (type
))
2933 SET_CLASSTYPE_READONLY_FIELDS_NEED_INIT (t
, 1);
2936 if (DECL_MUTABLE_P (x
) || TYPE_HAS_MUTABLE_P (type
))
2937 CLASSTYPE_HAS_MUTABLE (t
) = 1;
2939 if (! pod_type_p (type
))
2940 /* DR 148 now allows pointers to members (which are POD themselves),
2941 to be allowed in POD structs. */
2942 CLASSTYPE_NON_POD_P (t
) = 1;
2944 if (! zero_init_p (type
))
2945 CLASSTYPE_NON_ZERO_INIT_P (t
) = 1;
2947 /* If any field is const, the structure type is pseudo-const. */
2948 if (CP_TYPE_CONST_P (type
))
2950 C_TYPE_FIELDS_READONLY (t
) = 1;
2951 if (DECL_INITIAL (x
) == NULL_TREE
)
2952 SET_CLASSTYPE_READONLY_FIELDS_NEED_INIT (t
, 1);
2954 /* ARM $12.6.2: [A member initializer list] (or, for an
2955 aggregate, initialization by a brace-enclosed list) is the
2956 only way to initialize nonstatic const and reference
2958 *cant_have_default_ctor_p
= 1;
2959 TYPE_HAS_COMPLEX_ASSIGN_REF (t
) = 1;
2961 if (! TYPE_HAS_CONSTRUCTOR (t
) && CLASSTYPE_NON_AGGREGATE (t
)
2963 cp_warning_at ("non-static const member %q#D in class without a constructor", x
);
2965 /* A field that is pseudo-const makes the structure likewise. */
2966 else if (CLASS_TYPE_P (type
))
2968 C_TYPE_FIELDS_READONLY (t
) |= C_TYPE_FIELDS_READONLY (type
);
2969 SET_CLASSTYPE_READONLY_FIELDS_NEED_INIT (t
,
2970 CLASSTYPE_READONLY_FIELDS_NEED_INIT (t
)
2971 | CLASSTYPE_READONLY_FIELDS_NEED_INIT (type
));
2974 /* Core issue 80: A nonstatic data member is required to have a
2975 different name from the class iff the class has a
2976 user-defined constructor. */
2977 if (constructor_name_p (DECL_NAME (x
), t
) && TYPE_HAS_CONSTRUCTOR (t
))
2978 cp_pedwarn_at ("field %q#D with same name as class", x
);
2980 /* We set DECL_C_BIT_FIELD in grokbitfield.
2981 If the type and width are valid, we'll also set DECL_BIT_FIELD. */
2982 if (DECL_C_BIT_FIELD (x
))
2983 check_bitfield_decl (x
);
2985 check_field_decl (x
, t
,
2986 cant_have_const_ctor_p
,
2987 cant_have_default_ctor_p
,
2989 &any_default_members
);
2992 /* Effective C++ rule 11: if a class has dynamic memory held by pointers,
2993 it should also define a copy constructor and an assignment operator to
2994 implement the correct copy semantic (deep vs shallow, etc.). As it is
2995 not feasible to check whether the constructors do allocate dynamic memory
2996 and store it within members, we approximate the warning like this:
2998 -- Warn only if there are members which are pointers
2999 -- Warn only if there is a non-trivial constructor (otherwise,
3000 there cannot be memory allocated).
3001 -- Warn only if there is a non-trivial destructor. We assume that the
3002 user at least implemented the cleanup correctly, and a destructor
3003 is needed to free dynamic memory.
3005 This seems enough for practical purposes. */
3008 && TYPE_HAS_CONSTRUCTOR (t
)
3009 && TYPE_HAS_DESTRUCTOR (t
)
3010 && !(TYPE_HAS_INIT_REF (t
) && TYPE_HAS_ASSIGN_REF (t
)))
3012 warning ("%q#T has pointer data members", t
);
3014 if (! TYPE_HAS_INIT_REF (t
))
3016 warning (" but does not override %<%T(const %T&)%>", t
, t
);
3017 if (! TYPE_HAS_ASSIGN_REF (t
))
3018 warning (" or %<operator=(const %T&)%>", t
);
3020 else if (! TYPE_HAS_ASSIGN_REF (t
))
3021 warning (" but does not override %<operator=(const %T&)%>", t
);
3025 /* Check anonymous struct/anonymous union fields. */
3026 finish_struct_anon (t
);
3028 /* We've built up the list of access declarations in reverse order.
3030 *access_decls
= nreverse (*access_decls
);
3033 /* If TYPE is an empty class type, records its OFFSET in the table of
3037 record_subobject_offset (tree type
, tree offset
, splay_tree offsets
)
3041 if (!is_empty_class (type
))
3044 /* Record the location of this empty object in OFFSETS. */
3045 n
= splay_tree_lookup (offsets
, (splay_tree_key
) offset
);
3047 n
= splay_tree_insert (offsets
,
3048 (splay_tree_key
) offset
,
3049 (splay_tree_value
) NULL_TREE
);
3050 n
->value
= ((splay_tree_value
)
3051 tree_cons (NULL_TREE
,
3058 /* Returns nonzero if TYPE is an empty class type and there is
3059 already an entry in OFFSETS for the same TYPE as the same OFFSET. */
3062 check_subobject_offset (tree type
, tree offset
, splay_tree offsets
)
3067 if (!is_empty_class (type
))
3070 /* Record the location of this empty object in OFFSETS. */
3071 n
= splay_tree_lookup (offsets
, (splay_tree_key
) offset
);
3075 for (t
= (tree
) n
->value
; t
; t
= TREE_CHAIN (t
))
3076 if (same_type_p (TREE_VALUE (t
), type
))
3082 /* Walk through all the subobjects of TYPE (located at OFFSET). Call
3083 F for every subobject, passing it the type, offset, and table of
3084 OFFSETS. If VBASES_P is one, then virtual non-primary bases should
3087 If MAX_OFFSET is non-NULL, then subobjects with an offset greater
3088 than MAX_OFFSET will not be walked.
3090 If F returns a nonzero value, the traversal ceases, and that value
3091 is returned. Otherwise, returns zero. */
3094 walk_subobject_offsets (tree type
,
3095 subobject_offset_fn f
,
3102 tree type_binfo
= NULL_TREE
;
3104 /* If this OFFSET is bigger than the MAX_OFFSET, then we should
3106 if (max_offset
&& INT_CST_LT (max_offset
, offset
))
3111 if (abi_version_at_least (2))
3113 type
= BINFO_TYPE (type
);
3116 if (CLASS_TYPE_P (type
))
3122 /* Avoid recursing into objects that are not interesting. */
3123 if (!CLASSTYPE_CONTAINS_EMPTY_CLASS_P (type
))
3126 /* Record the location of TYPE. */
3127 r
= (*f
) (type
, offset
, offsets
);
3131 /* Iterate through the direct base classes of TYPE. */
3133 type_binfo
= TYPE_BINFO (type
);
3134 for (i
= 0; BINFO_BASE_ITERATE (type_binfo
, i
, binfo
); i
++)
3138 if (abi_version_at_least (2)
3139 && BINFO_VIRTUAL_P (binfo
))
3143 && BINFO_VIRTUAL_P (binfo
)
3144 && !BINFO_PRIMARY_P (binfo
))
3147 if (!abi_version_at_least (2))
3148 binfo_offset
= size_binop (PLUS_EXPR
,
3150 BINFO_OFFSET (binfo
));
3154 /* We cannot rely on BINFO_OFFSET being set for the base
3155 class yet, but the offsets for direct non-virtual
3156 bases can be calculated by going back to the TYPE. */
3157 orig_binfo
= BINFO_BASE_BINFO (TYPE_BINFO (type
), i
);
3158 binfo_offset
= size_binop (PLUS_EXPR
,
3160 BINFO_OFFSET (orig_binfo
));
3163 r
= walk_subobject_offsets (binfo
,
3168 (abi_version_at_least (2)
3169 ? /*vbases_p=*/0 : vbases_p
));
3174 if (abi_version_at_least (2) && CLASSTYPE_VBASECLASSES (type
))
3179 /* Iterate through the virtual base classes of TYPE. In G++
3180 3.2, we included virtual bases in the direct base class
3181 loop above, which results in incorrect results; the
3182 correct offsets for virtual bases are only known when
3183 working with the most derived type. */
3185 for (vbases
= CLASSTYPE_VBASECLASSES (type
), ix
= 0;
3186 VEC_iterate (tree
, vbases
, ix
, binfo
); ix
++)
3188 r
= walk_subobject_offsets (binfo
,
3190 size_binop (PLUS_EXPR
,
3192 BINFO_OFFSET (binfo
)),
3201 /* We still have to walk the primary base, if it is
3202 virtual. (If it is non-virtual, then it was walked
3204 tree vbase
= get_primary_binfo (type_binfo
);
3206 if (vbase
&& BINFO_VIRTUAL_P (vbase
)
3207 && BINFO_PRIMARY_P (vbase
)
3208 && BINFO_INHERITANCE_CHAIN (vbase
) == type_binfo
)
3210 r
= (walk_subobject_offsets
3212 offsets
, max_offset
, /*vbases_p=*/0));
3219 /* Iterate through the fields of TYPE. */
3220 for (field
= TYPE_FIELDS (type
); field
; field
= TREE_CHAIN (field
))
3221 if (TREE_CODE (field
) == FIELD_DECL
&& !DECL_ARTIFICIAL (field
))
3225 if (abi_version_at_least (2))
3226 field_offset
= byte_position (field
);
3228 /* In G++ 3.2, DECL_FIELD_OFFSET was used. */
3229 field_offset
= DECL_FIELD_OFFSET (field
);
3231 r
= walk_subobject_offsets (TREE_TYPE (field
),
3233 size_binop (PLUS_EXPR
,
3243 else if (TREE_CODE (type
) == ARRAY_TYPE
)
3245 tree element_type
= strip_array_types (type
);
3246 tree domain
= TYPE_DOMAIN (type
);
3249 /* Avoid recursing into objects that are not interesting. */
3250 if (!CLASS_TYPE_P (element_type
)
3251 || !CLASSTYPE_CONTAINS_EMPTY_CLASS_P (element_type
))
3254 /* Step through each of the elements in the array. */
3255 for (index
= size_zero_node
;
3256 /* G++ 3.2 had an off-by-one error here. */
3257 (abi_version_at_least (2)
3258 ? !INT_CST_LT (TYPE_MAX_VALUE (domain
), index
)
3259 : INT_CST_LT (index
, TYPE_MAX_VALUE (domain
)));
3260 index
= size_binop (PLUS_EXPR
, index
, size_one_node
))
3262 r
= walk_subobject_offsets (TREE_TYPE (type
),
3270 offset
= size_binop (PLUS_EXPR
, offset
,
3271 TYPE_SIZE_UNIT (TREE_TYPE (type
)));
3272 /* If this new OFFSET is bigger than the MAX_OFFSET, then
3273 there's no point in iterating through the remaining
3274 elements of the array. */
3275 if (max_offset
&& INT_CST_LT (max_offset
, offset
))
3283 /* Record all of the empty subobjects of TYPE (located at OFFSET) in
3284 OFFSETS. If VBASES_P is nonzero, virtual bases of TYPE are
3288 record_subobject_offsets (tree type
,
3293 walk_subobject_offsets (type
, record_subobject_offset
, offset
,
3294 offsets
, /*max_offset=*/NULL_TREE
, vbases_p
);
3297 /* Returns nonzero if any of the empty subobjects of TYPE (located at
3298 OFFSET) conflict with entries in OFFSETS. If VBASES_P is nonzero,
3299 virtual bases of TYPE are examined. */
3302 layout_conflict_p (tree type
,
3307 splay_tree_node max_node
;
3309 /* Get the node in OFFSETS that indicates the maximum offset where
3310 an empty subobject is located. */
3311 max_node
= splay_tree_max (offsets
);
3312 /* If there aren't any empty subobjects, then there's no point in
3313 performing this check. */
3317 return walk_subobject_offsets (type
, check_subobject_offset
, offset
,
3318 offsets
, (tree
) (max_node
->key
),
3322 /* DECL is a FIELD_DECL corresponding either to a base subobject of a
3323 non-static data member of the type indicated by RLI. BINFO is the
3324 binfo corresponding to the base subobject, OFFSETS maps offsets to
3325 types already located at those offsets. This function determines
3326 the position of the DECL. */
3329 layout_nonempty_base_or_field (record_layout_info rli
,
3334 tree offset
= NULL_TREE
;
3340 /* For the purposes of determining layout conflicts, we want to
3341 use the class type of BINFO; TREE_TYPE (DECL) will be the
3342 CLASSTYPE_AS_BASE version, which does not contain entries for
3343 zero-sized bases. */
3344 type
= TREE_TYPE (binfo
);
3349 type
= TREE_TYPE (decl
);
3353 /* Try to place the field. It may take more than one try if we have
3354 a hard time placing the field without putting two objects of the
3355 same type at the same address. */
3358 struct record_layout_info_s old_rli
= *rli
;
3360 /* Place this field. */
3361 place_field (rli
, decl
);
3362 offset
= byte_position (decl
);
3364 /* We have to check to see whether or not there is already
3365 something of the same type at the offset we're about to use.
3366 For example, consider:
3369 struct T : public S { int i; };
3370 struct U : public S, public T {};
3372 Here, we put S at offset zero in U. Then, we can't put T at
3373 offset zero -- its S component would be at the same address
3374 as the S we already allocated. So, we have to skip ahead.
3375 Since all data members, including those whose type is an
3376 empty class, have nonzero size, any overlap can happen only
3377 with a direct or indirect base-class -- it can't happen with
3379 /* In a union, overlap is permitted; all members are placed at
3381 if (TREE_CODE (rli
->t
) == UNION_TYPE
)
3383 /* G++ 3.2 did not check for overlaps when placing a non-empty
3385 if (!abi_version_at_least (2) && binfo
&& BINFO_VIRTUAL_P (binfo
))
3387 if (layout_conflict_p (field_p
? type
: binfo
, offset
,
3390 /* Strip off the size allocated to this field. That puts us
3391 at the first place we could have put the field with
3392 proper alignment. */
3395 /* Bump up by the alignment required for the type. */
3397 = size_binop (PLUS_EXPR
, rli
->bitpos
,
3399 ? CLASSTYPE_ALIGN (type
)
3400 : TYPE_ALIGN (type
)));
3401 normalize_rli (rli
);
3404 /* There was no conflict. We're done laying out this field. */
3408 /* Now that we know where it will be placed, update its
3410 if (binfo
&& CLASS_TYPE_P (BINFO_TYPE (binfo
)))
3411 /* Indirect virtual bases may have a nonzero BINFO_OFFSET at
3412 this point because their BINFO_OFFSET is copied from another
3413 hierarchy. Therefore, we may not need to add the entire
3415 propagate_binfo_offsets (binfo
,
3416 size_diffop (convert (ssizetype
, offset
),
3418 BINFO_OFFSET (binfo
))));
3421 /* Returns true if TYPE is empty and OFFSET is nonzero. */
3424 empty_base_at_nonzero_offset_p (tree type
,
3426 splay_tree offsets ATTRIBUTE_UNUSED
)
3428 return is_empty_class (type
) && !integer_zerop (offset
);
3431 /* Layout the empty base BINFO. EOC indicates the byte currently just
3432 past the end of the class, and should be correctly aligned for a
3433 class of the type indicated by BINFO; OFFSETS gives the offsets of
3434 the empty bases allocated so far. T is the most derived
3435 type. Return nonzero iff we added it at the end. */
3438 layout_empty_base (tree binfo
, tree eoc
, splay_tree offsets
)
3441 tree basetype
= BINFO_TYPE (binfo
);
3444 /* This routine should only be used for empty classes. */
3445 gcc_assert (is_empty_class (basetype
));
3446 alignment
= ssize_int (CLASSTYPE_ALIGN_UNIT (basetype
));
3448 if (!integer_zerop (BINFO_OFFSET (binfo
)))
3450 if (abi_version_at_least (2))
3451 propagate_binfo_offsets
3452 (binfo
, size_diffop (size_zero_node
, BINFO_OFFSET (binfo
)));
3454 warning ("offset of empty base %qT may not be ABI-compliant and may"
3455 "change in a future version of GCC",
3456 BINFO_TYPE (binfo
));
3459 /* This is an empty base class. We first try to put it at offset
3461 if (layout_conflict_p (binfo
,
3462 BINFO_OFFSET (binfo
),
3466 /* That didn't work. Now, we move forward from the next
3467 available spot in the class. */
3469 propagate_binfo_offsets (binfo
, convert (ssizetype
, eoc
));
3472 if (!layout_conflict_p (binfo
,
3473 BINFO_OFFSET (binfo
),
3476 /* We finally found a spot where there's no overlap. */
3479 /* There's overlap here, too. Bump along to the next spot. */
3480 propagate_binfo_offsets (binfo
, alignment
);
3486 /* Layout the the base given by BINFO in the class indicated by RLI.
3487 *BASE_ALIGN is a running maximum of the alignments of
3488 any base class. OFFSETS gives the location of empty base
3489 subobjects. T is the most derived type. Return nonzero if the new
3490 object cannot be nearly-empty. A new FIELD_DECL is inserted at
3491 *NEXT_FIELD, unless BINFO is for an empty base class.
3493 Returns the location at which the next field should be inserted. */
3496 build_base_field (record_layout_info rli
, tree binfo
,
3497 splay_tree offsets
, tree
*next_field
)
3500 tree basetype
= BINFO_TYPE (binfo
);
3502 if (!COMPLETE_TYPE_P (basetype
))
3503 /* This error is now reported in xref_tag, thus giving better
3504 location information. */
3507 /* Place the base class. */
3508 if (!is_empty_class (basetype
))
3512 /* The containing class is non-empty because it has a non-empty
3514 CLASSTYPE_EMPTY_P (t
) = 0;
3516 /* Create the FIELD_DECL. */
3517 decl
= build_decl (FIELD_DECL
, NULL_TREE
, CLASSTYPE_AS_BASE (basetype
));
3518 DECL_ARTIFICIAL (decl
) = 1;
3519 DECL_FIELD_CONTEXT (decl
) = t
;
3520 DECL_SIZE (decl
) = CLASSTYPE_SIZE (basetype
);
3521 DECL_SIZE_UNIT (decl
) = CLASSTYPE_SIZE_UNIT (basetype
);
3522 DECL_ALIGN (decl
) = CLASSTYPE_ALIGN (basetype
);
3523 DECL_USER_ALIGN (decl
) = CLASSTYPE_USER_ALIGN (basetype
);
3524 DECL_MODE (decl
) = TYPE_MODE (basetype
);
3525 DECL_IGNORED_P (decl
) = 1;
3526 DECL_FIELD_IS_BASE (decl
) = 1;
3528 /* Try to place the field. It may take more than one try if we
3529 have a hard time placing the field without putting two
3530 objects of the same type at the same address. */
3531 layout_nonempty_base_or_field (rli
, decl
, binfo
, offsets
);
3532 /* Add the new FIELD_DECL to the list of fields for T. */
3533 TREE_CHAIN (decl
) = *next_field
;
3535 next_field
= &TREE_CHAIN (decl
);
3542 /* On some platforms (ARM), even empty classes will not be
3544 eoc
= round_up (rli_size_unit_so_far (rli
),
3545 CLASSTYPE_ALIGN_UNIT (basetype
));
3546 atend
= layout_empty_base (binfo
, eoc
, offsets
);
3547 /* A nearly-empty class "has no proper base class that is empty,
3548 not morally virtual, and at an offset other than zero." */
3549 if (!BINFO_VIRTUAL_P (binfo
) && CLASSTYPE_NEARLY_EMPTY_P (t
))
3552 CLASSTYPE_NEARLY_EMPTY_P (t
) = 0;
3553 /* The check above (used in G++ 3.2) is insufficient because
3554 an empty class placed at offset zero might itself have an
3555 empty base at a nonzero offset. */
3556 else if (walk_subobject_offsets (basetype
,
3557 empty_base_at_nonzero_offset_p
,
3560 /*max_offset=*/NULL_TREE
,
3563 if (abi_version_at_least (2))
3564 CLASSTYPE_NEARLY_EMPTY_P (t
) = 0;
3566 warning ("class %qT will be considered nearly empty in a "
3567 "future version of GCC", t
);
3571 /* We do not create a FIELD_DECL for empty base classes because
3572 it might overlap some other field. We want to be able to
3573 create CONSTRUCTORs for the class by iterating over the
3574 FIELD_DECLs, and the back end does not handle overlapping
3577 /* An empty virtual base causes a class to be non-empty
3578 -- but in that case we do not need to clear CLASSTYPE_EMPTY_P
3579 here because that was already done when the virtual table
3580 pointer was created. */
3583 /* Record the offsets of BINFO and its base subobjects. */
3584 record_subobject_offsets (binfo
,
3585 BINFO_OFFSET (binfo
),
3592 /* Layout all of the non-virtual base classes. Record empty
3593 subobjects in OFFSETS. T is the most derived type. Return nonzero
3594 if the type cannot be nearly empty. The fields created
3595 corresponding to the base classes will be inserted at
3599 build_base_fields (record_layout_info rli
,
3600 splay_tree offsets
, tree
*next_field
)
3602 /* Chain to hold all the new FIELD_DECLs which stand in for base class
3605 int n_baseclasses
= BINFO_N_BASE_BINFOS (TYPE_BINFO (t
));
3608 /* The primary base class is always allocated first. */
3609 if (CLASSTYPE_HAS_PRIMARY_BASE_P (t
))
3610 next_field
= build_base_field (rli
, CLASSTYPE_PRIMARY_BINFO (t
),
3611 offsets
, next_field
);
3613 /* Now allocate the rest of the bases. */
3614 for (i
= 0; i
< n_baseclasses
; ++i
)
3618 base_binfo
= BINFO_BASE_BINFO (TYPE_BINFO (t
), i
);
3620 /* The primary base was already allocated above, so we don't
3621 need to allocate it again here. */
3622 if (base_binfo
== CLASSTYPE_PRIMARY_BINFO (t
))
3625 /* Virtual bases are added at the end (a primary virtual base
3626 will have already been added). */
3627 if (BINFO_VIRTUAL_P (base_binfo
))
3630 next_field
= build_base_field (rli
, base_binfo
,
3631 offsets
, next_field
);
3635 /* Go through the TYPE_METHODS of T issuing any appropriate
3636 diagnostics, figuring out which methods override which other
3637 methods, and so forth. */
3640 check_methods (tree t
)
3644 for (x
= TYPE_METHODS (t
); x
; x
= TREE_CHAIN (x
))
3646 check_for_override (x
, t
);
3647 if (DECL_PURE_VIRTUAL_P (x
) && ! DECL_VINDEX (x
))
3648 cp_error_at ("initializer specified for non-virtual method %qD", x
);
3649 /* The name of the field is the original field name
3650 Save this in auxiliary field for later overloading. */
3651 if (DECL_VINDEX (x
))
3653 TYPE_POLYMORPHIC_P (t
) = 1;
3654 if (DECL_PURE_VIRTUAL_P (x
))
3655 VEC_safe_push (tree
, CLASSTYPE_PURE_VIRTUALS (t
), x
);
3660 /* FN is a constructor or destructor. Clone the declaration to create
3661 a specialized in-charge or not-in-charge version, as indicated by
3665 build_clone (tree fn
, tree name
)
3670 /* Copy the function. */
3671 clone
= copy_decl (fn
);
3672 /* Remember where this function came from. */
3673 DECL_CLONED_FUNCTION (clone
) = fn
;
3674 DECL_ABSTRACT_ORIGIN (clone
) = fn
;
3675 /* Reset the function name. */
3676 DECL_NAME (clone
) = name
;
3677 SET_DECL_ASSEMBLER_NAME (clone
, NULL_TREE
);
3678 /* There's no pending inline data for this function. */
3679 DECL_PENDING_INLINE_INFO (clone
) = NULL
;
3680 DECL_PENDING_INLINE_P (clone
) = 0;
3681 /* And it hasn't yet been deferred. */
3682 DECL_DEFERRED_FN (clone
) = 0;
3684 /* The base-class destructor is not virtual. */
3685 if (name
== base_dtor_identifier
)
3687 DECL_VIRTUAL_P (clone
) = 0;
3688 if (TREE_CODE (clone
) != TEMPLATE_DECL
)
3689 DECL_VINDEX (clone
) = NULL_TREE
;
3692 /* If there was an in-charge parameter, drop it from the function
3694 if (DECL_HAS_IN_CHARGE_PARM_P (clone
))
3700 exceptions
= TYPE_RAISES_EXCEPTIONS (TREE_TYPE (clone
));
3701 basetype
= TYPE_METHOD_BASETYPE (TREE_TYPE (clone
));
3702 parmtypes
= TYPE_ARG_TYPES (TREE_TYPE (clone
));
3703 /* Skip the `this' parameter. */
3704 parmtypes
= TREE_CHAIN (parmtypes
);
3705 /* Skip the in-charge parameter. */
3706 parmtypes
= TREE_CHAIN (parmtypes
);
3707 /* And the VTT parm, in a complete [cd]tor. */
3708 if (DECL_HAS_VTT_PARM_P (fn
)
3709 && ! DECL_NEEDS_VTT_PARM_P (clone
))
3710 parmtypes
= TREE_CHAIN (parmtypes
);
3711 /* If this is subobject constructor or destructor, add the vtt
3714 = build_method_type_directly (basetype
,
3715 TREE_TYPE (TREE_TYPE (clone
)),
3718 TREE_TYPE (clone
) = build_exception_variant (TREE_TYPE (clone
),
3721 = cp_build_type_attribute_variant (TREE_TYPE (clone
),
3722 TYPE_ATTRIBUTES (TREE_TYPE (fn
)));
3725 /* Copy the function parameters. But, DECL_ARGUMENTS on a TEMPLATE_DECL
3726 aren't function parameters; those are the template parameters. */
3727 if (TREE_CODE (clone
) != TEMPLATE_DECL
)
3729 DECL_ARGUMENTS (clone
) = copy_list (DECL_ARGUMENTS (clone
));
3730 /* Remove the in-charge parameter. */
3731 if (DECL_HAS_IN_CHARGE_PARM_P (clone
))
3733 TREE_CHAIN (DECL_ARGUMENTS (clone
))
3734 = TREE_CHAIN (TREE_CHAIN (DECL_ARGUMENTS (clone
)));
3735 DECL_HAS_IN_CHARGE_PARM_P (clone
) = 0;
3737 /* And the VTT parm, in a complete [cd]tor. */
3738 if (DECL_HAS_VTT_PARM_P (fn
))
3740 if (DECL_NEEDS_VTT_PARM_P (clone
))
3741 DECL_HAS_VTT_PARM_P (clone
) = 1;
3744 TREE_CHAIN (DECL_ARGUMENTS (clone
))
3745 = TREE_CHAIN (TREE_CHAIN (DECL_ARGUMENTS (clone
)));
3746 DECL_HAS_VTT_PARM_P (clone
) = 0;
3750 for (parms
= DECL_ARGUMENTS (clone
); parms
; parms
= TREE_CHAIN (parms
))
3752 DECL_CONTEXT (parms
) = clone
;
3753 cxx_dup_lang_specific_decl (parms
);
3757 /* Create the RTL for this function. */
3758 SET_DECL_RTL (clone
, NULL_RTX
);
3759 rest_of_decl_compilation (clone
, /*top_level=*/1, at_eof
);
3761 /* Make it easy to find the CLONE given the FN. */
3762 TREE_CHAIN (clone
) = TREE_CHAIN (fn
);
3763 TREE_CHAIN (fn
) = clone
;
3765 /* If this is a template, handle the DECL_TEMPLATE_RESULT as well. */
3766 if (TREE_CODE (clone
) == TEMPLATE_DECL
)
3770 DECL_TEMPLATE_RESULT (clone
)
3771 = build_clone (DECL_TEMPLATE_RESULT (clone
), name
);
3772 result
= DECL_TEMPLATE_RESULT (clone
);
3773 DECL_TEMPLATE_INFO (result
) = copy_node (DECL_TEMPLATE_INFO (result
));
3774 DECL_TI_TEMPLATE (result
) = clone
;
3780 /* Produce declarations for all appropriate clones of FN. If
3781 UPDATE_METHOD_VEC_P is nonzero, the clones are added to the
3782 CLASTYPE_METHOD_VEC as well. */
3785 clone_function_decl (tree fn
, int update_method_vec_p
)
3789 /* Avoid inappropriate cloning. */
3791 && DECL_CLONED_FUNCTION (TREE_CHAIN (fn
)))
3794 if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (fn
))
3796 /* For each constructor, we need two variants: an in-charge version
3797 and a not-in-charge version. */
3798 clone
= build_clone (fn
, complete_ctor_identifier
);
3799 if (update_method_vec_p
)
3800 add_method (DECL_CONTEXT (clone
), clone
);
3801 clone
= build_clone (fn
, base_ctor_identifier
);
3802 if (update_method_vec_p
)
3803 add_method (DECL_CONTEXT (clone
), clone
);
3807 gcc_assert (DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P (fn
));
3809 /* For each destructor, we need three variants: an in-charge
3810 version, a not-in-charge version, and an in-charge deleting
3811 version. We clone the deleting version first because that
3812 means it will go second on the TYPE_METHODS list -- and that
3813 corresponds to the correct layout order in the virtual
3816 For a non-virtual destructor, we do not build a deleting
3818 if (DECL_VIRTUAL_P (fn
))
3820 clone
= build_clone (fn
, deleting_dtor_identifier
);
3821 if (update_method_vec_p
)
3822 add_method (DECL_CONTEXT (clone
), clone
);
3824 clone
= build_clone (fn
, complete_dtor_identifier
);
3825 if (update_method_vec_p
)
3826 add_method (DECL_CONTEXT (clone
), clone
);
3827 clone
= build_clone (fn
, base_dtor_identifier
);
3828 if (update_method_vec_p
)
3829 add_method (DECL_CONTEXT (clone
), clone
);
3832 /* Note that this is an abstract function that is never emitted. */
3833 DECL_ABSTRACT (fn
) = 1;
3836 /* DECL is an in charge constructor, which is being defined. This will
3837 have had an in class declaration, from whence clones were
3838 declared. An out-of-class definition can specify additional default
3839 arguments. As it is the clones that are involved in overload
3840 resolution, we must propagate the information from the DECL to its
3844 adjust_clone_args (tree decl
)
3848 for (clone
= TREE_CHAIN (decl
); clone
&& DECL_CLONED_FUNCTION (clone
);
3849 clone
= TREE_CHAIN (clone
))
3851 tree orig_clone_parms
= TYPE_ARG_TYPES (TREE_TYPE (clone
));
3852 tree orig_decl_parms
= TYPE_ARG_TYPES (TREE_TYPE (decl
));
3853 tree decl_parms
, clone_parms
;
3855 clone_parms
= orig_clone_parms
;
3857 /* Skip the 'this' parameter. */
3858 orig_clone_parms
= TREE_CHAIN (orig_clone_parms
);
3859 orig_decl_parms
= TREE_CHAIN (orig_decl_parms
);
3861 if (DECL_HAS_IN_CHARGE_PARM_P (decl
))
3862 orig_decl_parms
= TREE_CHAIN (orig_decl_parms
);
3863 if (DECL_HAS_VTT_PARM_P (decl
))
3864 orig_decl_parms
= TREE_CHAIN (orig_decl_parms
);
3866 clone_parms
= orig_clone_parms
;
3867 if (DECL_HAS_VTT_PARM_P (clone
))
3868 clone_parms
= TREE_CHAIN (clone_parms
);
3870 for (decl_parms
= orig_decl_parms
; decl_parms
;
3871 decl_parms
= TREE_CHAIN (decl_parms
),
3872 clone_parms
= TREE_CHAIN (clone_parms
))
3874 gcc_assert (same_type_p (TREE_TYPE (decl_parms
),
3875 TREE_TYPE (clone_parms
)));
3877 if (TREE_PURPOSE (decl_parms
) && !TREE_PURPOSE (clone_parms
))
3879 /* A default parameter has been added. Adjust the
3880 clone's parameters. */
3881 tree exceptions
= TYPE_RAISES_EXCEPTIONS (TREE_TYPE (clone
));
3882 tree basetype
= TYPE_METHOD_BASETYPE (TREE_TYPE (clone
));
3885 clone_parms
= orig_decl_parms
;
3887 if (DECL_HAS_VTT_PARM_P (clone
))
3889 clone_parms
= tree_cons (TREE_PURPOSE (orig_clone_parms
),
3890 TREE_VALUE (orig_clone_parms
),
3892 TREE_TYPE (clone_parms
) = TREE_TYPE (orig_clone_parms
);
3894 type
= build_method_type_directly (basetype
,
3895 TREE_TYPE (TREE_TYPE (clone
)),
3898 type
= build_exception_variant (type
, exceptions
);
3899 TREE_TYPE (clone
) = type
;
3901 clone_parms
= NULL_TREE
;
3905 gcc_assert (!clone_parms
);
3909 /* For each of the constructors and destructors in T, create an
3910 in-charge and not-in-charge variant. */
3913 clone_constructors_and_destructors (tree t
)
3917 /* If for some reason we don't have a CLASSTYPE_METHOD_VEC, we bail
3919 if (!CLASSTYPE_METHOD_VEC (t
))
3922 for (fns
= CLASSTYPE_CONSTRUCTORS (t
); fns
; fns
= OVL_NEXT (fns
))
3923 clone_function_decl (OVL_CURRENT (fns
), /*update_method_vec_p=*/1);
3924 for (fns
= CLASSTYPE_DESTRUCTORS (t
); fns
; fns
= OVL_NEXT (fns
))
3925 clone_function_decl (OVL_CURRENT (fns
), /*update_method_vec_p=*/1);
3928 /* Remove all zero-width bit-fields from T. */
3931 remove_zero_width_bit_fields (tree t
)
3935 fieldsp
= &TYPE_FIELDS (t
);
3938 if (TREE_CODE (*fieldsp
) == FIELD_DECL
3939 && DECL_C_BIT_FIELD (*fieldsp
)
3940 && DECL_INITIAL (*fieldsp
))
3941 *fieldsp
= TREE_CHAIN (*fieldsp
);
3943 fieldsp
= &TREE_CHAIN (*fieldsp
);
3947 /* Returns TRUE iff we need a cookie when dynamically allocating an
3948 array whose elements have the indicated class TYPE. */
3951 type_requires_array_cookie (tree type
)
3954 bool has_two_argument_delete_p
= false;
3956 gcc_assert (CLASS_TYPE_P (type
));
3958 /* If there's a non-trivial destructor, we need a cookie. In order
3959 to iterate through the array calling the destructor for each
3960 element, we'll have to know how many elements there are. */
3961 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type
))
3964 /* If the usual deallocation function is a two-argument whose second
3965 argument is of type `size_t', then we have to pass the size of
3966 the array to the deallocation function, so we will need to store
3968 fns
= lookup_fnfields (TYPE_BINFO (type
),
3969 ansi_opname (VEC_DELETE_EXPR
),
3971 /* If there are no `operator []' members, or the lookup is
3972 ambiguous, then we don't need a cookie. */
3973 if (!fns
|| fns
== error_mark_node
)
3975 /* Loop through all of the functions. */
3976 for (fns
= BASELINK_FUNCTIONS (fns
); fns
; fns
= OVL_NEXT (fns
))
3981 /* Select the current function. */
3982 fn
= OVL_CURRENT (fns
);
3983 /* See if this function is a one-argument delete function. If
3984 it is, then it will be the usual deallocation function. */
3985 second_parm
= TREE_CHAIN (TYPE_ARG_TYPES (TREE_TYPE (fn
)));
3986 if (second_parm
== void_list_node
)
3988 /* Otherwise, if we have a two-argument function and the second
3989 argument is `size_t', it will be the usual deallocation
3990 function -- unless there is one-argument function, too. */
3991 if (TREE_CHAIN (second_parm
) == void_list_node
3992 && same_type_p (TREE_VALUE (second_parm
), sizetype
))
3993 has_two_argument_delete_p
= true;
3996 return has_two_argument_delete_p
;
3999 /* Check the validity of the bases and members declared in T. Add any
4000 implicitly-generated functions (like copy-constructors and
4001 assignment operators). Compute various flag bits (like
4002 CLASSTYPE_NON_POD_T) for T. This routine works purely at the C++
4003 level: i.e., independently of the ABI in use. */
4006 check_bases_and_members (tree t
)
4008 /* Nonzero if we are not allowed to generate a default constructor
4010 int cant_have_default_ctor
;
4011 /* Nonzero if the implicitly generated copy constructor should take
4012 a non-const reference argument. */
4013 int cant_have_const_ctor
;
4014 /* Nonzero if the the implicitly generated assignment operator
4015 should take a non-const reference argument. */
4016 int no_const_asn_ref
;
4019 /* By default, we use const reference arguments and generate default
4021 cant_have_default_ctor
= 0;
4022 cant_have_const_ctor
= 0;
4023 no_const_asn_ref
= 0;
4025 /* Check all the base-classes. */
4026 check_bases (t
, &cant_have_default_ctor
, &cant_have_const_ctor
,
4029 /* Check all the data member declarations. */
4030 check_field_decls (t
, &access_decls
,
4031 &cant_have_default_ctor
,
4032 &cant_have_const_ctor
,
4035 /* Check all the method declarations. */
4038 /* A nearly-empty class has to be vptr-containing; a nearly empty
4039 class contains just a vptr. */
4040 if (!TYPE_CONTAINS_VPTR_P (t
))
4041 CLASSTYPE_NEARLY_EMPTY_P (t
) = 0;
4043 /* Do some bookkeeping that will guide the generation of implicitly
4044 declared member functions. */
4045 TYPE_HAS_COMPLEX_INIT_REF (t
)
4046 |= (TYPE_HAS_INIT_REF (t
) || TYPE_CONTAINS_VPTR_P (t
));
4047 TYPE_NEEDS_CONSTRUCTING (t
)
4048 |= (TYPE_HAS_CONSTRUCTOR (t
) || TYPE_CONTAINS_VPTR_P (t
));
4049 CLASSTYPE_NON_AGGREGATE (t
)
4050 |= (TYPE_HAS_CONSTRUCTOR (t
) || TYPE_POLYMORPHIC_P (t
));
4051 CLASSTYPE_NON_POD_P (t
)
4052 |= (CLASSTYPE_NON_AGGREGATE (t
) || TYPE_HAS_DESTRUCTOR (t
)
4053 || TYPE_HAS_ASSIGN_REF (t
));
4054 TYPE_HAS_COMPLEX_ASSIGN_REF (t
)
4055 |= TYPE_HAS_ASSIGN_REF (t
) || TYPE_CONTAINS_VPTR_P (t
);
4057 /* Synthesize any needed methods. */
4058 add_implicitly_declared_members (t
, cant_have_default_ctor
,
4059 cant_have_const_ctor
,
4062 /* Create the in-charge and not-in-charge variants of constructors
4064 clone_constructors_and_destructors (t
);
4066 /* Process the using-declarations. */
4067 for (; access_decls
; access_decls
= TREE_CHAIN (access_decls
))
4068 handle_using_decl (TREE_VALUE (access_decls
), t
);
4070 /* Build and sort the CLASSTYPE_METHOD_VEC. */
4071 finish_struct_methods (t
);
4073 /* Figure out whether or not we will need a cookie when dynamically
4074 allocating an array of this type. */
4075 TYPE_LANG_SPECIFIC (t
)->u
.c
.vec_new_uses_cookie
4076 = type_requires_array_cookie (t
);
4079 /* If T needs a pointer to its virtual function table, set TYPE_VFIELD
4080 accordingly. If a new vfield was created (because T doesn't have a
4081 primary base class), then the newly created field is returned. It
4082 is not added to the TYPE_FIELDS list; it is the caller's
4083 responsibility to do that. Accumulate declared virtual functions
4087 create_vtable_ptr (tree t
, tree
* virtuals_p
)
4091 /* Collect the virtual functions declared in T. */
4092 for (fn
= TYPE_METHODS (t
); fn
; fn
= TREE_CHAIN (fn
))
4093 if (DECL_VINDEX (fn
) && !DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P (fn
)
4094 && TREE_CODE (DECL_VINDEX (fn
)) != INTEGER_CST
)
4096 tree new_virtual
= make_node (TREE_LIST
);
4098 BV_FN (new_virtual
) = fn
;
4099 BV_DELTA (new_virtual
) = integer_zero_node
;
4100 BV_VCALL_INDEX (new_virtual
) = NULL_TREE
;
4102 TREE_CHAIN (new_virtual
) = *virtuals_p
;
4103 *virtuals_p
= new_virtual
;
4106 /* If we couldn't find an appropriate base class, create a new field
4107 here. Even if there weren't any new virtual functions, we might need a
4108 new virtual function table if we're supposed to include vptrs in
4109 all classes that need them. */
4110 if (!TYPE_VFIELD (t
) && (*virtuals_p
|| TYPE_CONTAINS_VPTR_P (t
)))
4112 /* We build this decl with vtbl_ptr_type_node, which is a
4113 `vtable_entry_type*'. It might seem more precise to use
4114 `vtable_entry_type (*)[N]' where N is the number of virtual
4115 functions. However, that would require the vtable pointer in
4116 base classes to have a different type than the vtable pointer
4117 in derived classes. We could make that happen, but that
4118 still wouldn't solve all the problems. In particular, the
4119 type-based alias analysis code would decide that assignments
4120 to the base class vtable pointer can't alias assignments to
4121 the derived class vtable pointer, since they have different
4122 types. Thus, in a derived class destructor, where the base
4123 class constructor was inlined, we could generate bad code for
4124 setting up the vtable pointer.
4126 Therefore, we use one type for all vtable pointers. We still
4127 use a type-correct type; it's just doesn't indicate the array
4128 bounds. That's better than using `void*' or some such; it's
4129 cleaner, and it let's the alias analysis code know that these
4130 stores cannot alias stores to void*! */
4133 field
= build_decl (FIELD_DECL
, get_vfield_name (t
), vtbl_ptr_type_node
);
4134 SET_DECL_ASSEMBLER_NAME (field
, get_identifier (VFIELD_BASE
));
4135 DECL_VIRTUAL_P (field
) = 1;
4136 DECL_ARTIFICIAL (field
) = 1;
4137 DECL_FIELD_CONTEXT (field
) = t
;
4138 DECL_FCONTEXT (field
) = t
;
4140 TYPE_VFIELD (t
) = field
;
4142 /* This class is non-empty. */
4143 CLASSTYPE_EMPTY_P (t
) = 0;
4151 /* Fixup the inline function given by INFO now that the class is
4155 fixup_pending_inline (tree fn
)
4157 if (DECL_PENDING_INLINE_INFO (fn
))
4159 tree args
= DECL_ARGUMENTS (fn
);
4162 DECL_CONTEXT (args
) = fn
;
4163 args
= TREE_CHAIN (args
);
4168 /* Fixup the inline methods and friends in TYPE now that TYPE is
4172 fixup_inline_methods (tree type
)
4174 tree method
= TYPE_METHODS (type
);
4175 VEC (tree
) *friends
;
4178 if (method
&& TREE_CODE (method
) == TREE_VEC
)
4180 if (TREE_VEC_ELT (method
, 1))
4181 method
= TREE_VEC_ELT (method
, 1);
4182 else if (TREE_VEC_ELT (method
, 0))
4183 method
= TREE_VEC_ELT (method
, 0);
4185 method
= TREE_VEC_ELT (method
, 2);
4188 /* Do inline member functions. */
4189 for (; method
; method
= TREE_CHAIN (method
))
4190 fixup_pending_inline (method
);
4193 for (friends
= CLASSTYPE_INLINE_FRIENDS (type
), ix
= 0;
4194 VEC_iterate (tree
, friends
, ix
, method
); ix
++)
4195 fixup_pending_inline (method
);
4196 CLASSTYPE_INLINE_FRIENDS (type
) = NULL
;
4199 /* Add OFFSET to all base types of BINFO which is a base in the
4200 hierarchy dominated by T.
4202 OFFSET, which is a type offset, is number of bytes. */
4205 propagate_binfo_offsets (tree binfo
, tree offset
)
4211 /* Update BINFO's offset. */
4212 BINFO_OFFSET (binfo
)
4213 = convert (sizetype
,
4214 size_binop (PLUS_EXPR
,
4215 convert (ssizetype
, BINFO_OFFSET (binfo
)),
4218 /* Find the primary base class. */
4219 primary_binfo
= get_primary_binfo (binfo
);
4221 if (primary_binfo
&& BINFO_INHERITANCE_CHAIN (primary_binfo
) == binfo
)
4222 propagate_binfo_offsets (primary_binfo
, offset
);
4224 /* Scan all of the bases, pushing the BINFO_OFFSET adjust
4226 for (i
= 0; BINFO_BASE_ITERATE (binfo
, i
, base_binfo
); ++i
)
4228 /* Don't do the primary base twice. */
4229 if (base_binfo
== primary_binfo
)
4232 if (BINFO_VIRTUAL_P (base_binfo
))
4235 propagate_binfo_offsets (base_binfo
, offset
);
4239 /* Set BINFO_OFFSET for all of the virtual bases for RLI->T. Update
4240 TYPE_ALIGN and TYPE_SIZE for T. OFFSETS gives the location of
4241 empty subobjects of T. */
4244 layout_virtual_bases (record_layout_info rli
, splay_tree offsets
)
4248 bool first_vbase
= true;
4251 if (BINFO_N_BASE_BINFOS (TYPE_BINFO (t
)) == 0)
4254 if (!abi_version_at_least(2))
4256 /* In G++ 3.2, we incorrectly rounded the size before laying out
4257 the virtual bases. */
4258 finish_record_layout (rli
, /*free_p=*/false);
4259 #ifdef STRUCTURE_SIZE_BOUNDARY
4260 /* Packed structures don't need to have minimum size. */
4261 if (! TYPE_PACKED (t
))
4262 TYPE_ALIGN (t
) = MAX (TYPE_ALIGN (t
), (unsigned) STRUCTURE_SIZE_BOUNDARY
);
4264 rli
->offset
= TYPE_SIZE_UNIT (t
);
4265 rli
->bitpos
= bitsize_zero_node
;
4266 rli
->record_align
= TYPE_ALIGN (t
);
4269 /* Find the last field. The artificial fields created for virtual
4270 bases will go after the last extant field to date. */
4271 next_field
= &TYPE_FIELDS (t
);
4273 next_field
= &TREE_CHAIN (*next_field
);
4275 /* Go through the virtual bases, allocating space for each virtual
4276 base that is not already a primary base class. These are
4277 allocated in inheritance graph order. */
4278 for (vbase
= TYPE_BINFO (t
); vbase
; vbase
= TREE_CHAIN (vbase
))
4280 if (!BINFO_VIRTUAL_P (vbase
))
4283 if (!BINFO_PRIMARY_P (vbase
))
4285 tree basetype
= TREE_TYPE (vbase
);
4287 /* This virtual base is not a primary base of any class in the
4288 hierarchy, so we have to add space for it. */
4289 next_field
= build_base_field (rli
, vbase
,
4290 offsets
, next_field
);
4292 /* If the first virtual base might have been placed at a
4293 lower address, had we started from CLASSTYPE_SIZE, rather
4294 than TYPE_SIZE, issue a warning. There can be both false
4295 positives and false negatives from this warning in rare
4296 cases; to deal with all the possibilities would probably
4297 require performing both layout algorithms and comparing
4298 the results which is not particularly tractable. */
4302 (size_binop (CEIL_DIV_EXPR
,
4303 round_up (CLASSTYPE_SIZE (t
),
4304 CLASSTYPE_ALIGN (basetype
)),
4306 BINFO_OFFSET (vbase
))))
4307 warning ("offset of virtual base %qT is not ABI-compliant and "
4308 "may change in a future version of GCC",
4311 first_vbase
= false;
4316 /* Returns the offset of the byte just past the end of the base class
4320 end_of_base (tree binfo
)
4324 if (is_empty_class (BINFO_TYPE (binfo
)))
4325 /* An empty class has zero CLASSTYPE_SIZE_UNIT, but we need to
4326 allocate some space for it. It cannot have virtual bases, so
4327 TYPE_SIZE_UNIT is fine. */
4328 size
= TYPE_SIZE_UNIT (BINFO_TYPE (binfo
));
4330 size
= CLASSTYPE_SIZE_UNIT (BINFO_TYPE (binfo
));
4332 return size_binop (PLUS_EXPR
, BINFO_OFFSET (binfo
), size
);
4335 /* Returns the offset of the byte just past the end of the base class
4336 with the highest offset in T. If INCLUDE_VIRTUALS_P is zero, then
4337 only non-virtual bases are included. */
4340 end_of_class (tree t
, int include_virtuals_p
)
4342 tree result
= size_zero_node
;
4349 for (binfo
= TYPE_BINFO (t
), i
= 0;
4350 BINFO_BASE_ITERATE (binfo
, i
, base_binfo
); ++i
)
4352 if (!include_virtuals_p
4353 && BINFO_VIRTUAL_P (base_binfo
)
4354 && (!BINFO_PRIMARY_P (base_binfo
)
4355 || BINFO_INHERITANCE_CHAIN (base_binfo
) != TYPE_BINFO (t
)))
4358 offset
= end_of_base (base_binfo
);
4359 if (INT_CST_LT_UNSIGNED (result
, offset
))
4363 /* G++ 3.2 did not check indirect virtual bases. */
4364 if (abi_version_at_least (2) && include_virtuals_p
)
4365 for (vbases
= CLASSTYPE_VBASECLASSES (t
), i
= 0;
4366 VEC_iterate (tree
, vbases
, i
, base_binfo
); i
++)
4368 offset
= end_of_base (base_binfo
);
4369 if (INT_CST_LT_UNSIGNED (result
, offset
))
4376 /* Warn about bases of T that are inaccessible because they are
4377 ambiguous. For example:
4380 struct T : public S {};
4381 struct U : public S, public T {};
4383 Here, `(S*) new U' is not allowed because there are two `S'
4387 warn_about_ambiguous_bases (tree t
)
4395 /* If there are no repeated bases, nothing can be ambiguous. */
4396 if (!CLASSTYPE_REPEATED_BASE_P (t
))
4399 /* Check direct bases. */
4400 for (binfo
= TYPE_BINFO (t
), i
= 0;
4401 BINFO_BASE_ITERATE (binfo
, i
, base_binfo
); ++i
)
4403 basetype
= BINFO_TYPE (base_binfo
);
4405 if (!lookup_base (t
, basetype
, ba_unique
| ba_quiet
, NULL
))
4406 warning ("direct base %qT inaccessible in %qT due to ambiguity",
4410 /* Check for ambiguous virtual bases. */
4412 for (vbases
= CLASSTYPE_VBASECLASSES (t
), i
= 0;
4413 VEC_iterate (tree
, vbases
, i
, binfo
); i
++)
4415 basetype
= BINFO_TYPE (binfo
);
4417 if (!lookup_base (t
, basetype
, ba_unique
| ba_quiet
, NULL
))
4418 warning ("virtual base %qT inaccessible in %qT due to ambiguity",
4423 /* Compare two INTEGER_CSTs K1 and K2. */
4426 splay_tree_compare_integer_csts (splay_tree_key k1
, splay_tree_key k2
)
4428 return tree_int_cst_compare ((tree
) k1
, (tree
) k2
);
4431 /* Increase the size indicated in RLI to account for empty classes
4432 that are "off the end" of the class. */
4435 include_empty_classes (record_layout_info rli
)
4440 /* It might be the case that we grew the class to allocate a
4441 zero-sized base class. That won't be reflected in RLI, yet,
4442 because we are willing to overlay multiple bases at the same
4443 offset. However, now we need to make sure that RLI is big enough
4444 to reflect the entire class. */
4445 eoc
= end_of_class (rli
->t
,
4446 CLASSTYPE_AS_BASE (rli
->t
) != NULL_TREE
);
4447 rli_size
= rli_size_unit_so_far (rli
);
4448 if (TREE_CODE (rli_size
) == INTEGER_CST
4449 && INT_CST_LT_UNSIGNED (rli_size
, eoc
))
4451 if (!abi_version_at_least (2))
4452 /* In version 1 of the ABI, the size of a class that ends with
4453 a bitfield was not rounded up to a whole multiple of a
4454 byte. Because rli_size_unit_so_far returns only the number
4455 of fully allocated bytes, any extra bits were not included
4457 rli
->bitpos
= round_down (rli
->bitpos
, BITS_PER_UNIT
);
4459 /* The size should have been rounded to a whole byte. */
4460 gcc_assert (tree_int_cst_equal
4461 (rli
->bitpos
, round_down (rli
->bitpos
, BITS_PER_UNIT
)));
4463 = size_binop (PLUS_EXPR
,
4465 size_binop (MULT_EXPR
,
4466 convert (bitsizetype
,
4467 size_binop (MINUS_EXPR
,
4469 bitsize_int (BITS_PER_UNIT
)));
4470 normalize_rli (rli
);
4474 /* Calculate the TYPE_SIZE, TYPE_ALIGN, etc for T. Calculate
4475 BINFO_OFFSETs for all of the base-classes. Position the vtable
4476 pointer. Accumulate declared virtual functions on VIRTUALS_P. */
4479 layout_class_type (tree t
, tree
*virtuals_p
)
4481 tree non_static_data_members
;
4484 record_layout_info rli
;
4485 /* Maps offsets (represented as INTEGER_CSTs) to a TREE_LIST of
4486 types that appear at that offset. */
4487 splay_tree empty_base_offsets
;
4488 /* True if the last field layed out was a bit-field. */
4489 bool last_field_was_bitfield
= false;
4490 /* The location at which the next field should be inserted. */
4492 /* T, as a base class. */
4495 /* Keep track of the first non-static data member. */
4496 non_static_data_members
= TYPE_FIELDS (t
);
4498 /* Start laying out the record. */
4499 rli
= start_record_layout (t
);
4501 /* Mark all the primary bases in the hierarchy. */
4502 determine_primary_bases (t
);
4504 /* Create a pointer to our virtual function table. */
4505 vptr
= create_vtable_ptr (t
, virtuals_p
);
4507 /* The vptr is always the first thing in the class. */
4510 TREE_CHAIN (vptr
) = TYPE_FIELDS (t
);
4511 TYPE_FIELDS (t
) = vptr
;
4512 next_field
= &TREE_CHAIN (vptr
);
4513 place_field (rli
, vptr
);
4516 next_field
= &TYPE_FIELDS (t
);
4518 /* Build FIELD_DECLs for all of the non-virtual base-types. */
4519 empty_base_offsets
= splay_tree_new (splay_tree_compare_integer_csts
,
4521 build_base_fields (rli
, empty_base_offsets
, next_field
);
4523 /* Layout the non-static data members. */
4524 for (field
= non_static_data_members
; field
; field
= TREE_CHAIN (field
))
4529 /* We still pass things that aren't non-static data members to
4530 the back-end, in case it wants to do something with them. */
4531 if (TREE_CODE (field
) != FIELD_DECL
)
4533 place_field (rli
, field
);
4534 /* If the static data member has incomplete type, keep track
4535 of it so that it can be completed later. (The handling
4536 of pending statics in finish_record_layout is
4537 insufficient; consider:
4540 struct S2 { static S1 s1; };
4542 At this point, finish_record_layout will be called, but
4543 S1 is still incomplete.) */
4544 if (TREE_CODE (field
) == VAR_DECL
)
4545 maybe_register_incomplete_var (field
);
4549 type
= TREE_TYPE (field
);
4551 padding
= NULL_TREE
;
4553 /* If this field is a bit-field whose width is greater than its
4554 type, then there are some special rules for allocating
4556 if (DECL_C_BIT_FIELD (field
)
4557 && INT_CST_LT (TYPE_SIZE (type
), DECL_SIZE (field
)))
4559 integer_type_kind itk
;
4561 bool was_unnamed_p
= false;
4562 /* We must allocate the bits as if suitably aligned for the
4563 longest integer type that fits in this many bits. type
4564 of the field. Then, we are supposed to use the left over
4565 bits as additional padding. */
4566 for (itk
= itk_char
; itk
!= itk_none
; ++itk
)
4567 if (INT_CST_LT (DECL_SIZE (field
),
4568 TYPE_SIZE (integer_types
[itk
])))
4571 /* ITK now indicates a type that is too large for the
4572 field. We have to back up by one to find the largest
4574 integer_type
= integer_types
[itk
- 1];
4576 /* Figure out how much additional padding is required. GCC
4577 3.2 always created a padding field, even if it had zero
4579 if (!abi_version_at_least (2)
4580 || INT_CST_LT (TYPE_SIZE (integer_type
), DECL_SIZE (field
)))
4582 if (abi_version_at_least (2) && TREE_CODE (t
) == UNION_TYPE
)
4583 /* In a union, the padding field must have the full width
4584 of the bit-field; all fields start at offset zero. */
4585 padding
= DECL_SIZE (field
);
4588 if (warn_abi
&& TREE_CODE (t
) == UNION_TYPE
)
4589 warning ("size assigned to `%T' may not be "
4590 "ABI-compliant and may change in a future "
4593 padding
= size_binop (MINUS_EXPR
, DECL_SIZE (field
),
4594 TYPE_SIZE (integer_type
));
4597 #ifdef PCC_BITFIELD_TYPE_MATTERS
4598 /* An unnamed bitfield does not normally affect the
4599 alignment of the containing class on a target where
4600 PCC_BITFIELD_TYPE_MATTERS. But, the C++ ABI does not
4601 make any exceptions for unnamed bitfields when the
4602 bitfields are longer than their types. Therefore, we
4603 temporarily give the field a name. */
4604 if (PCC_BITFIELD_TYPE_MATTERS
&& !DECL_NAME (field
))
4606 was_unnamed_p
= true;
4607 DECL_NAME (field
) = make_anon_name ();
4610 DECL_SIZE (field
) = TYPE_SIZE (integer_type
);
4611 DECL_ALIGN (field
) = TYPE_ALIGN (integer_type
);
4612 DECL_USER_ALIGN (field
) = TYPE_USER_ALIGN (integer_type
);
4613 layout_nonempty_base_or_field (rli
, field
, NULL_TREE
,
4614 empty_base_offsets
);
4616 DECL_NAME (field
) = NULL_TREE
;
4617 /* Now that layout has been performed, set the size of the
4618 field to the size of its declared type; the rest of the
4619 field is effectively invisible. */
4620 DECL_SIZE (field
) = TYPE_SIZE (type
);
4621 /* We must also reset the DECL_MODE of the field. */
4622 if (abi_version_at_least (2))
4623 DECL_MODE (field
) = TYPE_MODE (type
);
4625 && DECL_MODE (field
) != TYPE_MODE (type
))
4626 /* Versions of G++ before G++ 3.4 did not reset the
4628 warning ("the offset of %qD may not be ABI-compliant and may "
4629 "change in a future version of GCC", field
);
4632 layout_nonempty_base_or_field (rli
, field
, NULL_TREE
,
4633 empty_base_offsets
);
4635 /* Remember the location of any empty classes in FIELD. */
4636 if (abi_version_at_least (2))
4637 record_subobject_offsets (TREE_TYPE (field
),
4638 byte_position(field
),
4642 /* If a bit-field does not immediately follow another bit-field,
4643 and yet it starts in the middle of a byte, we have failed to
4644 comply with the ABI. */
4646 && DECL_C_BIT_FIELD (field
)
4647 && !last_field_was_bitfield
4648 && !integer_zerop (size_binop (TRUNC_MOD_EXPR
,
4649 DECL_FIELD_BIT_OFFSET (field
),
4650 bitsize_unit_node
)))
4651 cp_warning_at ("offset of %qD is not ABI-compliant and may "
4652 "change in a future version of GCC",
4655 /* G++ used to use DECL_FIELD_OFFSET as if it were the byte
4656 offset of the field. */
4658 && !tree_int_cst_equal (DECL_FIELD_OFFSET (field
),
4659 byte_position (field
))
4660 && contains_empty_class_p (TREE_TYPE (field
)))
4661 cp_warning_at ("%qD contains empty classes which may cause base "
4662 "classes to be placed at different locations in a "
4663 "future version of GCC",
4666 /* If we needed additional padding after this field, add it
4672 padding_field
= build_decl (FIELD_DECL
,
4675 DECL_BIT_FIELD (padding_field
) = 1;
4676 DECL_SIZE (padding_field
) = padding
;
4677 DECL_CONTEXT (padding_field
) = t
;
4678 DECL_ARTIFICIAL (padding_field
) = 1;
4679 layout_nonempty_base_or_field (rli
, padding_field
,
4681 empty_base_offsets
);
4684 last_field_was_bitfield
= DECL_C_BIT_FIELD (field
);
4687 if (abi_version_at_least (2) && !integer_zerop (rli
->bitpos
))
4689 /* Make sure that we are on a byte boundary so that the size of
4690 the class without virtual bases will always be a round number
4692 rli
->bitpos
= round_up (rli
->bitpos
, BITS_PER_UNIT
);
4693 normalize_rli (rli
);
4696 /* G++ 3.2 does not allow virtual bases to be overlaid with tail
4698 if (!abi_version_at_least (2))
4699 include_empty_classes(rli
);
4701 /* Delete all zero-width bit-fields from the list of fields. Now
4702 that the type is laid out they are no longer important. */
4703 remove_zero_width_bit_fields (t
);
4705 /* Create the version of T used for virtual bases. We do not use
4706 make_aggr_type for this version; this is an artificial type. For
4707 a POD type, we just reuse T. */
4708 if (CLASSTYPE_NON_POD_P (t
) || CLASSTYPE_EMPTY_P (t
))
4710 base_t
= make_node (TREE_CODE (t
));
4712 /* Set the size and alignment for the new type. In G++ 3.2, all
4713 empty classes were considered to have size zero when used as
4715 if (!abi_version_at_least (2) && CLASSTYPE_EMPTY_P (t
))
4717 TYPE_SIZE (base_t
) = bitsize_zero_node
;
4718 TYPE_SIZE_UNIT (base_t
) = size_zero_node
;
4719 if (warn_abi
&& !integer_zerop (rli_size_unit_so_far (rli
)))
4720 warning ("layout of classes derived from empty class %qT "
4721 "may change in a future version of GCC",
4728 /* If the ABI version is not at least two, and the last
4729 field was a bit-field, RLI may not be on a byte
4730 boundary. In particular, rli_size_unit_so_far might
4731 indicate the last complete byte, while rli_size_so_far
4732 indicates the total number of bits used. Therefore,
4733 rli_size_so_far, rather than rli_size_unit_so_far, is
4734 used to compute TYPE_SIZE_UNIT. */
4735 eoc
= end_of_class (t
, /*include_virtuals_p=*/0);
4736 TYPE_SIZE_UNIT (base_t
)
4737 = size_binop (MAX_EXPR
,
4739 size_binop (CEIL_DIV_EXPR
,
4740 rli_size_so_far (rli
),
4741 bitsize_int (BITS_PER_UNIT
))),
4744 = size_binop (MAX_EXPR
,
4745 rli_size_so_far (rli
),
4746 size_binop (MULT_EXPR
,
4747 convert (bitsizetype
, eoc
),
4748 bitsize_int (BITS_PER_UNIT
)));
4750 TYPE_ALIGN (base_t
) = rli
->record_align
;
4751 TYPE_USER_ALIGN (base_t
) = TYPE_USER_ALIGN (t
);
4753 /* Copy the fields from T. */
4754 next_field
= &TYPE_FIELDS (base_t
);
4755 for (field
= TYPE_FIELDS (t
); field
; field
= TREE_CHAIN (field
))
4756 if (TREE_CODE (field
) == FIELD_DECL
)
4758 *next_field
= build_decl (FIELD_DECL
,
4761 DECL_CONTEXT (*next_field
) = base_t
;
4762 DECL_FIELD_OFFSET (*next_field
) = DECL_FIELD_OFFSET (field
);
4763 DECL_FIELD_BIT_OFFSET (*next_field
)
4764 = DECL_FIELD_BIT_OFFSET (field
);
4765 DECL_SIZE (*next_field
) = DECL_SIZE (field
);
4766 DECL_MODE (*next_field
) = DECL_MODE (field
);
4767 next_field
= &TREE_CHAIN (*next_field
);
4770 /* Record the base version of the type. */
4771 CLASSTYPE_AS_BASE (t
) = base_t
;
4772 TYPE_CONTEXT (base_t
) = t
;
4775 CLASSTYPE_AS_BASE (t
) = t
;
4777 /* Every empty class contains an empty class. */
4778 if (CLASSTYPE_EMPTY_P (t
))
4779 CLASSTYPE_CONTAINS_EMPTY_CLASS_P (t
) = 1;
4781 /* Set the TYPE_DECL for this type to contain the right
4782 value for DECL_OFFSET, so that we can use it as part
4783 of a COMPONENT_REF for multiple inheritance. */
4784 layout_decl (TYPE_MAIN_DECL (t
), 0);
4786 /* Now fix up any virtual base class types that we left lying
4787 around. We must get these done before we try to lay out the
4788 virtual function table. As a side-effect, this will remove the
4789 base subobject fields. */
4790 layout_virtual_bases (rli
, empty_base_offsets
);
4792 /* Make sure that empty classes are reflected in RLI at this
4794 include_empty_classes(rli
);
4796 /* Make sure not to create any structures with zero size. */
4797 if (integer_zerop (rli_size_unit_so_far (rli
)) && CLASSTYPE_EMPTY_P (t
))
4799 build_decl (FIELD_DECL
, NULL_TREE
, char_type_node
));
4801 /* Let the back-end lay out the type. */
4802 finish_record_layout (rli
, /*free_p=*/true);
4804 /* Warn about bases that can't be talked about due to ambiguity. */
4805 warn_about_ambiguous_bases (t
);
4807 /* Now that we're done with layout, give the base fields the real types. */
4808 for (field
= TYPE_FIELDS (t
); field
; field
= TREE_CHAIN (field
))
4809 if (DECL_ARTIFICIAL (field
) && IS_FAKE_BASE_TYPE (TREE_TYPE (field
)))
4810 TREE_TYPE (field
) = TYPE_CONTEXT (TREE_TYPE (field
));
4813 splay_tree_delete (empty_base_offsets
);
4816 /* Determine the "key method" for the class type indicated by TYPE,
4817 and set CLASSTYPE_KEY_METHOD accordingly. */
4820 determine_key_method (tree type
)
4824 if (TYPE_FOR_JAVA (type
)
4825 || processing_template_decl
4826 || CLASSTYPE_TEMPLATE_INSTANTIATION (type
)
4827 || CLASSTYPE_INTERFACE_KNOWN (type
))
4830 /* The key method is the first non-pure virtual function that is not
4831 inline at the point of class definition. On some targets the
4832 key function may not be inline; those targets should not call
4833 this function until the end of the translation unit. */
4834 for (method
= TYPE_METHODS (type
); method
!= NULL_TREE
;
4835 method
= TREE_CHAIN (method
))
4836 if (DECL_VINDEX (method
) != NULL_TREE
4837 && ! DECL_DECLARED_INLINE_P (method
)
4838 && ! DECL_PURE_VIRTUAL_P (method
))
4840 CLASSTYPE_KEY_METHOD (type
) = method
;
4847 /* Perform processing required when the definition of T (a class type)
4851 finish_struct_1 (tree t
)
4854 /* A TREE_LIST. The TREE_VALUE of each node is a FUNCTION_DECL. */
4855 tree virtuals
= NULL_TREE
;
4858 if (COMPLETE_TYPE_P (t
))
4860 gcc_assert (IS_AGGR_TYPE (t
));
4861 error ("redefinition of %q#T", t
);
4866 /* If this type was previously laid out as a forward reference,
4867 make sure we lay it out again. */
4868 TYPE_SIZE (t
) = NULL_TREE
;
4869 CLASSTYPE_PRIMARY_BINFO (t
) = NULL_TREE
;
4871 fixup_inline_methods (t
);
4873 /* Make assumptions about the class; we'll reset the flags if
4875 CLASSTYPE_EMPTY_P (t
) = 1;
4876 CLASSTYPE_NEARLY_EMPTY_P (t
) = 1;
4877 CLASSTYPE_CONTAINS_EMPTY_CLASS_P (t
) = 0;
4879 /* Do end-of-class semantic processing: checking the validity of the
4880 bases and members and add implicitly generated methods. */
4881 check_bases_and_members (t
);
4883 /* Find the key method. */
4884 if (TYPE_CONTAINS_VPTR_P (t
))
4886 /* The Itanium C++ ABI permits the key method to be chosen when
4887 the class is defined -- even though the key method so
4888 selected may later turn out to be an inline function. On
4889 some systems (such as ARM Symbian OS) the key method cannot
4890 be determined until the end of the translation unit. On such
4891 systems, we leave CLASSTYPE_KEY_METHOD set to NULL, which
4892 will cause the class to be added to KEYED_CLASSES. Then, in
4893 finish_file we will determine the key method. */
4894 if (targetm
.cxx
.key_method_may_be_inline ())
4895 determine_key_method (t
);
4897 /* If a polymorphic class has no key method, we may emit the vtable
4898 in every translation unit where the class definition appears. */
4899 if (CLASSTYPE_KEY_METHOD (t
) == NULL_TREE
)
4900 keyed_classes
= tree_cons (NULL_TREE
, t
, keyed_classes
);
4903 /* Layout the class itself. */
4904 layout_class_type (t
, &virtuals
);
4905 if (CLASSTYPE_AS_BASE (t
) != t
)
4906 /* We use the base type for trivial assignments, and hence it
4908 compute_record_mode (CLASSTYPE_AS_BASE (t
));
4910 virtuals
= modify_all_vtables (t
, nreverse (virtuals
));
4912 /* If necessary, create the primary vtable for this class. */
4913 if (virtuals
|| TYPE_CONTAINS_VPTR_P (t
))
4915 /* We must enter these virtuals into the table. */
4916 if (!CLASSTYPE_HAS_PRIMARY_BASE_P (t
))
4917 build_primary_vtable (NULL_TREE
, t
);
4918 else if (! BINFO_NEW_VTABLE_MARKED (TYPE_BINFO (t
)))
4919 /* Here we know enough to change the type of our virtual
4920 function table, but we will wait until later this function. */
4921 build_primary_vtable (CLASSTYPE_PRIMARY_BINFO (t
), t
);
4924 if (TYPE_CONTAINS_VPTR_P (t
))
4929 if (BINFO_VTABLE (TYPE_BINFO (t
)))
4930 gcc_assert (DECL_VIRTUAL_P (BINFO_VTABLE (TYPE_BINFO (t
))));
4931 if (!CLASSTYPE_HAS_PRIMARY_BASE_P (t
))
4932 gcc_assert (BINFO_VIRTUALS (TYPE_BINFO (t
)) == NULL_TREE
);
4934 /* Add entries for virtual functions introduced by this class. */
4935 BINFO_VIRTUALS (TYPE_BINFO (t
))
4936 = chainon (BINFO_VIRTUALS (TYPE_BINFO (t
)), virtuals
);
4938 /* Set DECL_VINDEX for all functions declared in this class. */
4939 for (vindex
= 0, fn
= BINFO_VIRTUALS (TYPE_BINFO (t
));
4941 fn
= TREE_CHAIN (fn
),
4942 vindex
+= (TARGET_VTABLE_USES_DESCRIPTORS
4943 ? TARGET_VTABLE_USES_DESCRIPTORS
: 1))
4945 tree fndecl
= BV_FN (fn
);
4947 if (DECL_THUNK_P (fndecl
))
4948 /* A thunk. We should never be calling this entry directly
4949 from this vtable -- we'd use the entry for the non
4950 thunk base function. */
4951 DECL_VINDEX (fndecl
) = NULL_TREE
;
4952 else if (TREE_CODE (DECL_VINDEX (fndecl
)) != INTEGER_CST
)
4953 DECL_VINDEX (fndecl
) = build_int_cst (NULL_TREE
, vindex
);
4957 finish_struct_bits (t
);
4959 /* Complete the rtl for any static member objects of the type we're
4961 for (x
= TYPE_FIELDS (t
); x
; x
= TREE_CHAIN (x
))
4962 if (TREE_CODE (x
) == VAR_DECL
&& TREE_STATIC (x
)
4963 && same_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (x
)), t
))
4964 DECL_MODE (x
) = TYPE_MODE (t
);
4966 /* Done with FIELDS...now decide whether to sort these for
4967 faster lookups later.
4969 We use a small number because most searches fail (succeeding
4970 ultimately as the search bores through the inheritance
4971 hierarchy), and we want this failure to occur quickly. */
4973 n_fields
= count_fields (TYPE_FIELDS (t
));
4976 struct sorted_fields_type
*field_vec
= GGC_NEWVAR
4977 (struct sorted_fields_type
,
4978 sizeof (struct sorted_fields_type
) + n_fields
* sizeof (tree
));
4979 field_vec
->len
= n_fields
;
4980 add_fields_to_record_type (TYPE_FIELDS (t
), field_vec
, 0);
4981 qsort (field_vec
->elts
, n_fields
, sizeof (tree
),
4983 if (! DECL_LANG_SPECIFIC (TYPE_MAIN_DECL (t
)))
4984 retrofit_lang_decl (TYPE_MAIN_DECL (t
));
4985 DECL_SORTED_FIELDS (TYPE_MAIN_DECL (t
)) = field_vec
;
4988 /* Make the rtl for any new vtables we have created, and unmark
4989 the base types we marked. */
4992 /* Build the VTT for T. */
4995 if (warn_nonvdtor
&& TYPE_POLYMORPHIC_P (t
) && TYPE_HAS_DESTRUCTOR (t
)
4996 && !DECL_VINDEX (CLASSTYPE_DESTRUCTORS (t
)))
4999 tree dtor
= CLASSTYPE_DESTRUCTORS (t
);
5001 /* Warn only if the dtor is non-private or the class has friends */
5002 if (!TREE_PRIVATE (dtor
) ||
5003 (CLASSTYPE_FRIEND_CLASSES (t
) ||
5004 DECL_FRIENDLIST (TYPE_MAIN_DECL (t
))))
5005 warning ("%q#T has virtual functions but non-virtual destructor", t
);
5010 if (warn_overloaded_virtual
)
5013 maybe_suppress_debug_info (t
);
5015 dump_class_hierarchy (t
);
5017 /* Finish debugging output for this type. */
5018 rest_of_type_compilation (t
, ! LOCAL_CLASS_P (t
));
5021 /* When T was built up, the member declarations were added in reverse
5022 order. Rearrange them to declaration order. */
5025 unreverse_member_declarations (tree t
)
5031 /* The following lists are all in reverse order. Put them in
5032 declaration order now. */
5033 TYPE_METHODS (t
) = nreverse (TYPE_METHODS (t
));
5034 CLASSTYPE_DECL_LIST (t
) = nreverse (CLASSTYPE_DECL_LIST (t
));
5036 /* Actually, for the TYPE_FIELDS, only the non TYPE_DECLs are in
5037 reverse order, so we can't just use nreverse. */
5039 for (x
= TYPE_FIELDS (t
);
5040 x
&& TREE_CODE (x
) != TYPE_DECL
;
5043 next
= TREE_CHAIN (x
);
5044 TREE_CHAIN (x
) = prev
;
5049 TREE_CHAIN (TYPE_FIELDS (t
)) = x
;
5051 TYPE_FIELDS (t
) = prev
;
5056 finish_struct (tree t
, tree attributes
)
5058 location_t saved_loc
= input_location
;
5060 /* Now that we've got all the field declarations, reverse everything
5062 unreverse_member_declarations (t
);
5064 cplus_decl_attributes (&t
, attributes
, (int) ATTR_FLAG_TYPE_IN_PLACE
);
5066 /* Nadger the current location so that diagnostics point to the start of
5067 the struct, not the end. */
5068 input_location
= DECL_SOURCE_LOCATION (TYPE_NAME (t
));
5070 if (processing_template_decl
)
5074 finish_struct_methods (t
);
5075 TYPE_SIZE (t
) = bitsize_zero_node
;
5077 /* We need to emit an error message if this type was used as a parameter
5078 and it is an abstract type, even if it is a template. We construct
5079 a simple CLASSTYPE_PURE_VIRTUALS list without taking bases into
5080 account and we call complete_vars with this type, which will check
5081 the PARM_DECLS. Note that while the type is being defined,
5082 CLASSTYPE_PURE_VIRTUALS contains the list of the inline friends
5083 (see CLASSTYPE_INLINE_FRIENDS) so we need to clear it. */
5084 CLASSTYPE_PURE_VIRTUALS (t
) = NULL
;
5085 for (x
= TYPE_METHODS (t
); x
; x
= TREE_CHAIN (x
))
5086 if (DECL_PURE_VIRTUAL_P (x
))
5087 VEC_safe_push (tree
, CLASSTYPE_PURE_VIRTUALS (t
), x
);
5091 finish_struct_1 (t
);
5093 input_location
= saved_loc
;
5095 TYPE_BEING_DEFINED (t
) = 0;
5097 if (current_class_type
)
5100 error ("trying to finish struct, but kicked out due to previous parse errors");
5102 if (processing_template_decl
&& at_function_scope_p ())
5103 add_stmt (build_min (TAG_DEFN
, t
));
5108 /* Return the dynamic type of INSTANCE, if known.
5109 Used to determine whether the virtual function table is needed
5112 *NONNULL is set iff INSTANCE can be known to be nonnull, regardless
5113 of our knowledge of its type. *NONNULL should be initialized
5114 before this function is called. */
5117 fixed_type_or_null (tree instance
, int* nonnull
, int* cdtorp
)
5119 switch (TREE_CODE (instance
))
5122 if (POINTER_TYPE_P (TREE_TYPE (instance
)))
5125 return fixed_type_or_null (TREE_OPERAND (instance
, 0),
5129 /* This is a call to a constructor, hence it's never zero. */
5130 if (TREE_HAS_CONSTRUCTOR (instance
))
5134 return TREE_TYPE (instance
);
5139 /* This is a call to a constructor, hence it's never zero. */
5140 if (TREE_HAS_CONSTRUCTOR (instance
))
5144 return TREE_TYPE (instance
);
5146 return fixed_type_or_null (TREE_OPERAND (instance
, 0), nonnull
, cdtorp
);
5150 if (TREE_CODE (TREE_OPERAND (instance
, 0)) == ADDR_EXPR
)
5151 return fixed_type_or_null (TREE_OPERAND (instance
, 0), nonnull
, cdtorp
);
5152 if (TREE_CODE (TREE_OPERAND (instance
, 1)) == INTEGER_CST
)
5153 /* Propagate nonnull. */
5154 return fixed_type_or_null (TREE_OPERAND (instance
, 0), nonnull
, cdtorp
);
5159 return fixed_type_or_null (TREE_OPERAND (instance
, 0), nonnull
, cdtorp
);
5162 instance
= TREE_OPERAND (instance
, 0);
5165 /* Just because we see an ADDR_EXPR doesn't mean we're dealing
5166 with a real object -- given &p->f, p can still be null. */
5167 tree t
= get_base_address (instance
);
5168 /* ??? Probably should check DECL_WEAK here. */
5169 if (t
&& DECL_P (t
))
5172 return fixed_type_or_null (instance
, nonnull
, cdtorp
);
5175 /* If this component is really a base class reference, then the field
5176 itself isn't definitive. */
5177 if (DECL_FIELD_IS_BASE (TREE_OPERAND (instance
, 1)))
5178 return fixed_type_or_null (TREE_OPERAND (instance
, 0), nonnull
, cdtorp
);
5179 return fixed_type_or_null (TREE_OPERAND (instance
, 1), nonnull
, cdtorp
);
5183 if (TREE_CODE (TREE_TYPE (instance
)) == ARRAY_TYPE
5184 && IS_AGGR_TYPE (TREE_TYPE (TREE_TYPE (instance
))))
5188 return TREE_TYPE (TREE_TYPE (instance
));
5190 /* fall through... */
5194 if (IS_AGGR_TYPE (TREE_TYPE (instance
)))
5198 return TREE_TYPE (instance
);
5200 else if (instance
== current_class_ptr
)
5205 /* if we're in a ctor or dtor, we know our type. */
5206 if (DECL_LANG_SPECIFIC (current_function_decl
)
5207 && (DECL_CONSTRUCTOR_P (current_function_decl
)
5208 || DECL_DESTRUCTOR_P (current_function_decl
)))
5212 return TREE_TYPE (TREE_TYPE (instance
));
5215 else if (TREE_CODE (TREE_TYPE (instance
)) == REFERENCE_TYPE
)
5217 /* Reference variables should be references to objects. */
5221 /* DECL_VAR_MARKED_P is used to prevent recursion; a
5222 variable's initializer may refer to the variable
5224 if (TREE_CODE (instance
) == VAR_DECL
5225 && DECL_INITIAL (instance
)
5226 && !DECL_VAR_MARKED_P (instance
))
5229 DECL_VAR_MARKED_P (instance
) = 1;
5230 type
= fixed_type_or_null (DECL_INITIAL (instance
),
5232 DECL_VAR_MARKED_P (instance
) = 0;
5243 /* Return nonzero if the dynamic type of INSTANCE is known, and
5244 equivalent to the static type. We also handle the case where
5245 INSTANCE is really a pointer. Return negative if this is a
5246 ctor/dtor. There the dynamic type is known, but this might not be
5247 the most derived base of the original object, and hence virtual
5248 bases may not be layed out according to this type.
5250 Used to determine whether the virtual function table is needed
5253 *NONNULL is set iff INSTANCE can be known to be nonnull, regardless
5254 of our knowledge of its type. *NONNULL should be initialized
5255 before this function is called. */
5258 resolves_to_fixed_type_p (tree instance
, int* nonnull
)
5260 tree t
= TREE_TYPE (instance
);
5263 tree fixed
= fixed_type_or_null (instance
, nonnull
, &cdtorp
);
5264 if (fixed
== NULL_TREE
)
5266 if (POINTER_TYPE_P (t
))
5268 if (!same_type_ignoring_top_level_qualifiers_p (t
, fixed
))
5270 return cdtorp
? -1 : 1;
5275 init_class_processing (void)
5277 current_class_depth
= 0;
5278 current_class_stack_size
= 10;
5280 = xmalloc (current_class_stack_size
* sizeof (struct class_stack_node
));
5281 VARRAY_TREE_INIT (local_classes
, 8, "local_classes");
5283 ridpointers
[(int) RID_PUBLIC
] = access_public_node
;
5284 ridpointers
[(int) RID_PRIVATE
] = access_private_node
;
5285 ridpointers
[(int) RID_PROTECTED
] = access_protected_node
;
5288 /* Restore the cached PREVIOUS_CLASS_LEVEL. */
5291 restore_class_cache (void)
5295 /* We are re-entering the same class we just left, so we don't
5296 have to search the whole inheritance matrix to find all the
5297 decls to bind again. Instead, we install the cached
5298 class_shadowed list and walk through it binding names. */
5299 push_binding_level (previous_class_level
);
5300 class_binding_level
= previous_class_level
;
5301 /* Restore IDENTIFIER_TYPE_VALUE. */
5302 for (type
= class_binding_level
->type_shadowed
;
5304 type
= TREE_CHAIN (type
))
5305 SET_IDENTIFIER_TYPE_VALUE (TREE_PURPOSE (type
), TREE_TYPE (type
));
5308 /* Set global variables CURRENT_CLASS_NAME and CURRENT_CLASS_TYPE as
5309 appropriate for TYPE.
5311 So that we may avoid calls to lookup_name, we cache the _TYPE
5312 nodes of local TYPE_DECLs in the TREE_TYPE field of the name.
5314 For multiple inheritance, we perform a two-pass depth-first search
5315 of the type lattice. */
5318 pushclass (tree type
)
5320 type
= TYPE_MAIN_VARIANT (type
);
5322 /* Make sure there is enough room for the new entry on the stack. */
5323 if (current_class_depth
+ 1 >= current_class_stack_size
)
5325 current_class_stack_size
*= 2;
5327 = xrealloc (current_class_stack
,
5328 current_class_stack_size
5329 * sizeof (struct class_stack_node
));
5332 /* Insert a new entry on the class stack. */
5333 current_class_stack
[current_class_depth
].name
= current_class_name
;
5334 current_class_stack
[current_class_depth
].type
= current_class_type
;
5335 current_class_stack
[current_class_depth
].access
= current_access_specifier
;
5336 current_class_stack
[current_class_depth
].names_used
= 0;
5337 current_class_depth
++;
5339 /* Now set up the new type. */
5340 current_class_name
= TYPE_NAME (type
);
5341 if (TREE_CODE (current_class_name
) == TYPE_DECL
)
5342 current_class_name
= DECL_NAME (current_class_name
);
5343 current_class_type
= type
;
5345 /* By default, things in classes are private, while things in
5346 structures or unions are public. */
5347 current_access_specifier
= (CLASSTYPE_DECLARED_CLASS (type
)
5348 ? access_private_node
5349 : access_public_node
);
5351 if (previous_class_level
5352 && type
!= previous_class_level
->this_entity
5353 && current_class_depth
== 1)
5355 /* Forcibly remove any old class remnants. */
5356 invalidate_class_lookup_cache ();
5359 if (!previous_class_level
5360 || type
!= previous_class_level
->this_entity
5361 || current_class_depth
> 1)
5364 restore_class_cache ();
5366 cxx_remember_type_decls (CLASSTYPE_NESTED_UTDS (type
));
5369 /* When we exit a toplevel class scope, we save its binding level so
5370 that we can restore it quickly. Here, we've entered some other
5371 class, so we must invalidate our cache. */
5374 invalidate_class_lookup_cache (void)
5376 previous_class_level
= NULL
;
5379 /* Get out of the current class scope. If we were in a class scope
5380 previously, that is the one popped to. */
5387 current_class_depth
--;
5388 current_class_name
= current_class_stack
[current_class_depth
].name
;
5389 current_class_type
= current_class_stack
[current_class_depth
].type
;
5390 current_access_specifier
= current_class_stack
[current_class_depth
].access
;
5391 if (current_class_stack
[current_class_depth
].names_used
)
5392 splay_tree_delete (current_class_stack
[current_class_depth
].names_used
);
5395 /* Returns 1 if current_class_type is either T or a nested type of T.
5396 We start looking from 1 because entry 0 is from global scope, and has
5400 currently_open_class (tree t
)
5403 if (current_class_type
&& same_type_p (t
, current_class_type
))
5405 for (i
= 1; i
< current_class_depth
; ++i
)
5406 if (current_class_stack
[i
].type
5407 && same_type_p (current_class_stack
[i
].type
, t
))
5412 /* If either current_class_type or one of its enclosing classes are derived
5413 from T, return the appropriate type. Used to determine how we found
5414 something via unqualified lookup. */
5417 currently_open_derived_class (tree t
)
5421 /* The bases of a dependent type are unknown. */
5422 if (dependent_type_p (t
))
5425 if (!current_class_type
)
5428 if (DERIVED_FROM_P (t
, current_class_type
))
5429 return current_class_type
;
5431 for (i
= current_class_depth
- 1; i
> 0; --i
)
5432 if (DERIVED_FROM_P (t
, current_class_stack
[i
].type
))
5433 return current_class_stack
[i
].type
;
5438 /* When entering a class scope, all enclosing class scopes' names with
5439 static meaning (static variables, static functions, types and
5440 enumerators) have to be visible. This recursive function calls
5441 pushclass for all enclosing class contexts until global or a local
5442 scope is reached. TYPE is the enclosed class. */
5445 push_nested_class (tree type
)
5449 /* A namespace might be passed in error cases, like A::B:C. */
5450 if (type
== NULL_TREE
5451 || type
== error_mark_node
5452 || TREE_CODE (type
) == NAMESPACE_DECL
5453 || ! IS_AGGR_TYPE (type
)
5454 || TREE_CODE (type
) == TEMPLATE_TYPE_PARM
5455 || TREE_CODE (type
) == BOUND_TEMPLATE_TEMPLATE_PARM
)
5458 context
= DECL_CONTEXT (TYPE_MAIN_DECL (type
));
5460 if (context
&& CLASS_TYPE_P (context
))
5461 push_nested_class (context
);
5465 /* Undoes a push_nested_class call. */
5468 pop_nested_class (void)
5470 tree context
= DECL_CONTEXT (TYPE_MAIN_DECL (current_class_type
));
5473 if (context
&& CLASS_TYPE_P (context
))
5474 pop_nested_class ();
5477 /* Returns the number of extern "LANG" blocks we are nested within. */
5480 current_lang_depth (void)
5482 return VARRAY_ACTIVE_SIZE (current_lang_base
);
5485 /* Set global variables CURRENT_LANG_NAME to appropriate value
5486 so that behavior of name-mangling machinery is correct. */
5489 push_lang_context (tree name
)
5491 VARRAY_PUSH_TREE (current_lang_base
, current_lang_name
);
5493 if (name
== lang_name_cplusplus
)
5495 current_lang_name
= name
;
5497 else if (name
== lang_name_java
)
5499 current_lang_name
= name
;
5500 /* DECL_IGNORED_P is initially set for these types, to avoid clutter.
5501 (See record_builtin_java_type in decl.c.) However, that causes
5502 incorrect debug entries if these types are actually used.
5503 So we re-enable debug output after extern "Java". */
5504 DECL_IGNORED_P (TYPE_NAME (java_byte_type_node
)) = 0;
5505 DECL_IGNORED_P (TYPE_NAME (java_short_type_node
)) = 0;
5506 DECL_IGNORED_P (TYPE_NAME (java_int_type_node
)) = 0;
5507 DECL_IGNORED_P (TYPE_NAME (java_long_type_node
)) = 0;
5508 DECL_IGNORED_P (TYPE_NAME (java_float_type_node
)) = 0;
5509 DECL_IGNORED_P (TYPE_NAME (java_double_type_node
)) = 0;
5510 DECL_IGNORED_P (TYPE_NAME (java_char_type_node
)) = 0;
5511 DECL_IGNORED_P (TYPE_NAME (java_boolean_type_node
)) = 0;
5513 else if (name
== lang_name_c
)
5515 current_lang_name
= name
;
5518 error ("language string `\"%E\"' not recognized", name
);
5521 /* Get out of the current language scope. */
5524 pop_lang_context (void)
5526 current_lang_name
= VARRAY_TOP_TREE (current_lang_base
);
5527 VARRAY_POP (current_lang_base
);
5530 /* Type instantiation routines. */
5532 /* Given an OVERLOAD and a TARGET_TYPE, return the function that
5533 matches the TARGET_TYPE. If there is no satisfactory match, return
5534 error_mark_node, and issue a error & warning messages under control
5535 of FLAGS. Permit pointers to member function if FLAGS permits. If
5536 TEMPLATE_ONLY, the name of the overloaded function was a
5537 template-id, and EXPLICIT_TARGS are the explicitly provided
5538 template arguments. */
5541 resolve_address_of_overloaded_function (tree target_type
,
5543 tsubst_flags_t flags
,
5545 tree explicit_targs
)
5547 /* Here's what the standard says:
5551 If the name is a function template, template argument deduction
5552 is done, and if the argument deduction succeeds, the deduced
5553 arguments are used to generate a single template function, which
5554 is added to the set of overloaded functions considered.
5556 Non-member functions and static member functions match targets of
5557 type "pointer-to-function" or "reference-to-function." Nonstatic
5558 member functions match targets of type "pointer-to-member
5559 function;" the function type of the pointer to member is used to
5560 select the member function from the set of overloaded member
5561 functions. If a nonstatic member function is selected, the
5562 reference to the overloaded function name is required to have the
5563 form of a pointer to member as described in 5.3.1.
5565 If more than one function is selected, any template functions in
5566 the set are eliminated if the set also contains a non-template
5567 function, and any given template function is eliminated if the
5568 set contains a second template function that is more specialized
5569 than the first according to the partial ordering rules 14.5.5.2.
5570 After such eliminations, if any, there shall remain exactly one
5571 selected function. */
5574 int is_reference
= 0;
5575 /* We store the matches in a TREE_LIST rooted here. The functions
5576 are the TREE_PURPOSE, not the TREE_VALUE, in this list, for easy
5577 interoperability with most_specialized_instantiation. */
5578 tree matches
= NULL_TREE
;
5581 /* By the time we get here, we should be seeing only real
5582 pointer-to-member types, not the internal POINTER_TYPE to
5583 METHOD_TYPE representation. */
5584 gcc_assert (TREE_CODE (target_type
) != POINTER_TYPE
5585 || TREE_CODE (TREE_TYPE (target_type
)) != METHOD_TYPE
);
5587 gcc_assert (is_overloaded_fn (overload
));
5589 /* Check that the TARGET_TYPE is reasonable. */
5590 if (TYPE_PTRFN_P (target_type
))
5592 else if (TYPE_PTRMEMFUNC_P (target_type
))
5593 /* This is OK, too. */
5595 else if (TREE_CODE (target_type
) == FUNCTION_TYPE
)
5597 /* This is OK, too. This comes from a conversion to reference
5599 target_type
= build_reference_type (target_type
);
5604 if (flags
& tf_error
)
5606 cannot resolve overloaded function `%D' based on conversion to type `%T'",
5607 DECL_NAME (OVL_FUNCTION (overload
)), target_type
);
5608 return error_mark_node
;
5611 /* If we can find a non-template function that matches, we can just
5612 use it. There's no point in generating template instantiations
5613 if we're just going to throw them out anyhow. But, of course, we
5614 can only do this when we don't *need* a template function. */
5619 for (fns
= overload
; fns
; fns
= OVL_NEXT (fns
))
5621 tree fn
= OVL_CURRENT (fns
);
5624 if (TREE_CODE (fn
) == TEMPLATE_DECL
)
5625 /* We're not looking for templates just yet. */
5628 if ((TREE_CODE (TREE_TYPE (fn
)) == METHOD_TYPE
)
5630 /* We're looking for a non-static member, and this isn't
5631 one, or vice versa. */
5634 /* Ignore anticipated decls of undeclared builtins. */
5635 if (DECL_ANTICIPATED (fn
))
5638 /* See if there's a match. */
5639 fntype
= TREE_TYPE (fn
);
5641 fntype
= build_ptrmemfunc_type (build_pointer_type (fntype
));
5642 else if (!is_reference
)
5643 fntype
= build_pointer_type (fntype
);
5645 if (can_convert_arg (target_type
, fntype
, fn
))
5646 matches
= tree_cons (fn
, NULL_TREE
, matches
);
5650 /* Now, if we've already got a match (or matches), there's no need
5651 to proceed to the template functions. But, if we don't have a
5652 match we need to look at them, too. */
5655 tree target_fn_type
;
5656 tree target_arg_types
;
5657 tree target_ret_type
;
5662 = TREE_TYPE (TYPE_PTRMEMFUNC_FN_TYPE (target_type
));
5664 target_fn_type
= TREE_TYPE (target_type
);
5665 target_arg_types
= TYPE_ARG_TYPES (target_fn_type
);
5666 target_ret_type
= TREE_TYPE (target_fn_type
);
5668 /* Never do unification on the 'this' parameter. */
5669 if (TREE_CODE (target_fn_type
) == METHOD_TYPE
)
5670 target_arg_types
= TREE_CHAIN (target_arg_types
);
5672 for (fns
= overload
; fns
; fns
= OVL_NEXT (fns
))
5674 tree fn
= OVL_CURRENT (fns
);
5676 tree instantiation_type
;
5679 if (TREE_CODE (fn
) != TEMPLATE_DECL
)
5680 /* We're only looking for templates. */
5683 if ((TREE_CODE (TREE_TYPE (fn
)) == METHOD_TYPE
)
5685 /* We're not looking for a non-static member, and this is
5686 one, or vice versa. */
5689 /* Try to do argument deduction. */
5690 targs
= make_tree_vec (DECL_NTPARMS (fn
));
5691 if (fn_type_unification (fn
, explicit_targs
, targs
,
5692 target_arg_types
, target_ret_type
,
5693 DEDUCE_EXACT
, -1) != 0)
5694 /* Argument deduction failed. */
5697 /* Instantiate the template. */
5698 instantiation
= instantiate_template (fn
, targs
, flags
);
5699 if (instantiation
== error_mark_node
)
5700 /* Instantiation failed. */
5703 /* See if there's a match. */
5704 instantiation_type
= TREE_TYPE (instantiation
);
5706 instantiation_type
=
5707 build_ptrmemfunc_type (build_pointer_type (instantiation_type
));
5708 else if (!is_reference
)
5709 instantiation_type
= build_pointer_type (instantiation_type
);
5710 if (can_convert_arg (target_type
, instantiation_type
, instantiation
))
5711 matches
= tree_cons (instantiation
, fn
, matches
);
5714 /* Now, remove all but the most specialized of the matches. */
5717 tree match
= most_specialized_instantiation (matches
);
5719 if (match
!= error_mark_node
)
5720 matches
= tree_cons (match
, NULL_TREE
, NULL_TREE
);
5724 /* Now we should have exactly one function in MATCHES. */
5725 if (matches
== NULL_TREE
)
5727 /* There were *no* matches. */
5728 if (flags
& tf_error
)
5730 error ("no matches converting function %qD to type %q#T",
5731 DECL_NAME (OVL_FUNCTION (overload
)),
5734 /* print_candidates expects a chain with the functions in
5735 TREE_VALUE slots, so we cons one up here (we're losing anyway,
5736 so why be clever?). */
5737 for (; overload
; overload
= OVL_NEXT (overload
))
5738 matches
= tree_cons (NULL_TREE
, OVL_CURRENT (overload
),
5741 print_candidates (matches
);
5743 return error_mark_node
;
5745 else if (TREE_CHAIN (matches
))
5747 /* There were too many matches. */
5749 if (flags
& tf_error
)
5753 error ("converting overloaded function %qD to type %q#T is ambiguous",
5754 DECL_NAME (OVL_FUNCTION (overload
)),
5757 /* Since print_candidates expects the functions in the
5758 TREE_VALUE slot, we flip them here. */
5759 for (match
= matches
; match
; match
= TREE_CHAIN (match
))
5760 TREE_VALUE (match
) = TREE_PURPOSE (match
);
5762 print_candidates (matches
);
5765 return error_mark_node
;
5768 /* Good, exactly one match. Now, convert it to the correct type. */
5769 fn
= TREE_PURPOSE (matches
);
5771 if (DECL_NONSTATIC_MEMBER_FUNCTION_P (fn
)
5772 && !(flags
& tf_ptrmem_ok
) && !flag_ms_extensions
)
5774 static int explained
;
5776 if (!(flags
& tf_error
))
5777 return error_mark_node
;
5779 pedwarn ("assuming pointer to member %qD", fn
);
5782 pedwarn ("(a pointer to member can only be formed with %<&%E%>)", fn
);
5787 /* If we're doing overload resolution purely for the purpose of
5788 determining conversion sequences, we should not consider the
5789 function used. If this conversion sequence is selected, the
5790 function will be marked as used at this point. */
5791 if (!(flags
& tf_conv
))
5794 if (TYPE_PTRFN_P (target_type
) || TYPE_PTRMEMFUNC_P (target_type
))
5795 return build_unary_op (ADDR_EXPR
, fn
, 0);
5798 /* The target must be a REFERENCE_TYPE. Above, build_unary_op
5799 will mark the function as addressed, but here we must do it
5801 cxx_mark_addressable (fn
);
5807 /* This function will instantiate the type of the expression given in
5808 RHS to match the type of LHSTYPE. If errors exist, then return
5809 error_mark_node. FLAGS is a bit mask. If TF_ERROR is set, then
5810 we complain on errors. If we are not complaining, never modify rhs,
5811 as overload resolution wants to try many possible instantiations, in
5812 the hope that at least one will work.
5814 For non-recursive calls, LHSTYPE should be a function, pointer to
5815 function, or a pointer to member function. */
5818 instantiate_type (tree lhstype
, tree rhs
, tsubst_flags_t flags
)
5820 tsubst_flags_t flags_in
= flags
;
5822 flags
&= ~tf_ptrmem_ok
;
5824 if (TREE_CODE (lhstype
) == UNKNOWN_TYPE
)
5826 if (flags
& tf_error
)
5827 error ("not enough type information");
5828 return error_mark_node
;
5831 if (TREE_TYPE (rhs
) != NULL_TREE
&& ! (type_unknown_p (rhs
)))
5833 if (same_type_p (lhstype
, TREE_TYPE (rhs
)))
5835 if (flag_ms_extensions
5836 && TYPE_PTRMEMFUNC_P (lhstype
)
5837 && !TYPE_PTRMEMFUNC_P (TREE_TYPE (rhs
)))
5838 /* Microsoft allows `A::f' to be resolved to a
5839 pointer-to-member. */
5843 if (flags
& tf_error
)
5844 error ("argument of type %qT does not match %qT",
5845 TREE_TYPE (rhs
), lhstype
);
5846 return error_mark_node
;
5850 if (TREE_CODE (rhs
) == BASELINK
)
5851 rhs
= BASELINK_FUNCTIONS (rhs
);
5853 /* We don't overwrite rhs if it is an overloaded function.
5854 Copying it would destroy the tree link. */
5855 if (TREE_CODE (rhs
) != OVERLOAD
)
5856 rhs
= copy_node (rhs
);
5858 /* This should really only be used when attempting to distinguish
5859 what sort of a pointer to function we have. For now, any
5860 arithmetic operation which is not supported on pointers
5861 is rejected as an error. */
5863 switch (TREE_CODE (rhs
))
5876 new_rhs
= instantiate_type (build_pointer_type (lhstype
),
5877 TREE_OPERAND (rhs
, 0), flags
);
5878 if (new_rhs
== error_mark_node
)
5879 return error_mark_node
;
5881 TREE_TYPE (rhs
) = lhstype
;
5882 TREE_OPERAND (rhs
, 0) = new_rhs
;
5887 rhs
= copy_node (TREE_OPERAND (rhs
, 0));
5888 TREE_TYPE (rhs
) = unknown_type_node
;
5889 return instantiate_type (lhstype
, rhs
, flags
);
5893 tree addr
= instantiate_type (lhstype
, TREE_OPERAND (rhs
, 1), flags
);
5895 if (addr
!= error_mark_node
5896 && TREE_SIDE_EFFECTS (TREE_OPERAND (rhs
, 0)))
5897 /* Do not lose object's side effects. */
5898 addr
= build2 (COMPOUND_EXPR
, TREE_TYPE (addr
),
5899 TREE_OPERAND (rhs
, 0), addr
);
5904 rhs
= TREE_OPERAND (rhs
, 1);
5905 if (BASELINK_P (rhs
))
5906 return instantiate_type (lhstype
, BASELINK_FUNCTIONS (rhs
), flags_in
);
5908 /* This can happen if we are forming a pointer-to-member for a
5910 gcc_assert (TREE_CODE (rhs
) == TEMPLATE_ID_EXPR
);
5914 case TEMPLATE_ID_EXPR
:
5916 tree fns
= TREE_OPERAND (rhs
, 0);
5917 tree args
= TREE_OPERAND (rhs
, 1);
5920 resolve_address_of_overloaded_function (lhstype
, fns
, flags_in
,
5921 /*template_only=*/true,
5928 resolve_address_of_overloaded_function (lhstype
, rhs
, flags_in
,
5929 /*template_only=*/false,
5930 /*explicit_targs=*/NULL_TREE
);
5933 /* Now we should have a baselink. */
5934 gcc_assert (BASELINK_P (rhs
));
5936 return instantiate_type (lhstype
, BASELINK_FUNCTIONS (rhs
), flags
);
5939 /* This is too hard for now. */
5945 TREE_OPERAND (rhs
, 0)
5946 = instantiate_type (lhstype
, TREE_OPERAND (rhs
, 0), flags
);
5947 if (TREE_OPERAND (rhs
, 0) == error_mark_node
)
5948 return error_mark_node
;
5949 TREE_OPERAND (rhs
, 1)
5950 = instantiate_type (lhstype
, TREE_OPERAND (rhs
, 1), flags
);
5951 if (TREE_OPERAND (rhs
, 1) == error_mark_node
)
5952 return error_mark_node
;
5954 TREE_TYPE (rhs
) = lhstype
;
5958 case TRUNC_DIV_EXPR
:
5959 case FLOOR_DIV_EXPR
:
5961 case ROUND_DIV_EXPR
:
5963 case TRUNC_MOD_EXPR
:
5964 case FLOOR_MOD_EXPR
:
5966 case ROUND_MOD_EXPR
:
5967 case FIX_ROUND_EXPR
:
5968 case FIX_FLOOR_EXPR
:
5970 case FIX_TRUNC_EXPR
:
5985 case PREINCREMENT_EXPR
:
5986 case PREDECREMENT_EXPR
:
5987 case POSTINCREMENT_EXPR
:
5988 case POSTDECREMENT_EXPR
:
5989 if (flags
& tf_error
)
5990 error ("invalid operation on uninstantiated type");
5991 return error_mark_node
;
5993 case TRUTH_AND_EXPR
:
5995 case TRUTH_XOR_EXPR
:
6002 case TRUTH_ANDIF_EXPR
:
6003 case TRUTH_ORIF_EXPR
:
6004 case TRUTH_NOT_EXPR
:
6005 if (flags
& tf_error
)
6006 error ("not enough type information");
6007 return error_mark_node
;
6010 if (type_unknown_p (TREE_OPERAND (rhs
, 0)))
6012 if (flags
& tf_error
)
6013 error ("not enough type information");
6014 return error_mark_node
;
6016 TREE_OPERAND (rhs
, 1)
6017 = instantiate_type (lhstype
, TREE_OPERAND (rhs
, 1), flags
);
6018 if (TREE_OPERAND (rhs
, 1) == error_mark_node
)
6019 return error_mark_node
;
6020 TREE_OPERAND (rhs
, 2)
6021 = instantiate_type (lhstype
, TREE_OPERAND (rhs
, 2), flags
);
6022 if (TREE_OPERAND (rhs
, 2) == error_mark_node
)
6023 return error_mark_node
;
6025 TREE_TYPE (rhs
) = lhstype
;
6029 TREE_OPERAND (rhs
, 1)
6030 = instantiate_type (lhstype
, TREE_OPERAND (rhs
, 1), flags
);
6031 if (TREE_OPERAND (rhs
, 1) == error_mark_node
)
6032 return error_mark_node
;
6034 TREE_TYPE (rhs
) = lhstype
;
6039 if (PTRMEM_OK_P (rhs
))
6040 flags
|= tf_ptrmem_ok
;
6042 return instantiate_type (lhstype
, TREE_OPERAND (rhs
, 0), flags
);
6046 return error_mark_node
;
6051 return error_mark_node
;
6054 /* Return the name of the virtual function pointer field
6055 (as an IDENTIFIER_NODE) for the given TYPE. Note that
6056 this may have to look back through base types to find the
6057 ultimate field name. (For single inheritance, these could
6058 all be the same name. Who knows for multiple inheritance). */
6061 get_vfield_name (tree type
)
6063 tree binfo
, base_binfo
;
6066 for (binfo
= TYPE_BINFO (type
);
6067 BINFO_N_BASE_BINFOS (binfo
);
6070 base_binfo
= BINFO_BASE_BINFO (binfo
, 0);
6072 if (BINFO_VIRTUAL_P (base_binfo
)
6073 || !TYPE_CONTAINS_VPTR_P (BINFO_TYPE (base_binfo
)))
6077 type
= BINFO_TYPE (binfo
);
6078 buf
= alloca (sizeof (VFIELD_NAME_FORMAT
) + TYPE_NAME_LENGTH (type
) + 2);
6079 sprintf (buf
, VFIELD_NAME_FORMAT
,
6080 IDENTIFIER_POINTER (constructor_name (type
)));
6081 return get_identifier (buf
);
6085 print_class_statistics (void)
6087 #ifdef GATHER_STATISTICS
6088 fprintf (stderr
, "convert_harshness = %d\n", n_convert_harshness
);
6089 fprintf (stderr
, "compute_conversion_costs = %d\n", n_compute_conversion_costs
);
6092 fprintf (stderr
, "vtables = %d; vtable searches = %d\n",
6093 n_vtables
, n_vtable_searches
);
6094 fprintf (stderr
, "vtable entries = %d; vtable elems = %d\n",
6095 n_vtable_entries
, n_vtable_elems
);
6100 /* Build a dummy reference to ourselves so Derived::Base (and A::A) works,
6101 according to [class]:
6102 The class-name is also inserted
6103 into the scope of the class itself. For purposes of access checking,
6104 the inserted class name is treated as if it were a public member name. */
6107 build_self_reference (void)
6109 tree name
= constructor_name (current_class_type
);
6110 tree value
= build_lang_decl (TYPE_DECL
, name
, current_class_type
);
6113 DECL_NONLOCAL (value
) = 1;
6114 DECL_CONTEXT (value
) = current_class_type
;
6115 DECL_ARTIFICIAL (value
) = 1;
6116 SET_DECL_SELF_REFERENCE_P (value
);
6118 if (processing_template_decl
)
6119 value
= push_template_decl (value
);
6121 saved_cas
= current_access_specifier
;
6122 current_access_specifier
= access_public_node
;
6123 finish_member_declaration (value
);
6124 current_access_specifier
= saved_cas
;
6127 /* Returns 1 if TYPE contains only padding bytes. */
6130 is_empty_class (tree type
)
6132 if (type
== error_mark_node
)
6135 if (! IS_AGGR_TYPE (type
))
6138 /* In G++ 3.2, whether or not a class was empty was determined by
6139 looking at its size. */
6140 if (abi_version_at_least (2))
6141 return CLASSTYPE_EMPTY_P (type
);
6143 return integer_zerop (CLASSTYPE_SIZE (type
));
6146 /* Returns true if TYPE contains an empty class. */
6149 contains_empty_class_p (tree type
)
6151 if (is_empty_class (type
))
6153 if (CLASS_TYPE_P (type
))
6160 for (binfo
= TYPE_BINFO (type
), i
= 0;
6161 BINFO_BASE_ITERATE (binfo
, i
, base_binfo
); ++i
)
6162 if (contains_empty_class_p (BINFO_TYPE (base_binfo
)))
6164 for (field
= TYPE_FIELDS (type
); field
; field
= TREE_CHAIN (field
))
6165 if (TREE_CODE (field
) == FIELD_DECL
6166 && !DECL_ARTIFICIAL (field
)
6167 && is_empty_class (TREE_TYPE (field
)))
6170 else if (TREE_CODE (type
) == ARRAY_TYPE
)
6171 return contains_empty_class_p (TREE_TYPE (type
));
6175 /* Find the enclosing class of the given NODE. NODE can be a *_DECL or
6176 a *_TYPE node. NODE can also be a local class. */
6179 get_enclosing_class (tree type
)
6183 while (node
&& TREE_CODE (node
) != NAMESPACE_DECL
)
6185 switch (TREE_CODE_CLASS (TREE_CODE (node
)))
6187 case tcc_declaration
:
6188 node
= DECL_CONTEXT (node
);
6194 node
= TYPE_CONTEXT (node
);
6204 /* Note that NAME was looked up while the current class was being
6205 defined and that the result of that lookup was DECL. */
6208 maybe_note_name_used_in_class (tree name
, tree decl
)
6210 splay_tree names_used
;
6212 /* If we're not defining a class, there's nothing to do. */
6213 if (!(innermost_scope_kind() == sk_class
6214 && TYPE_BEING_DEFINED (current_class_type
)))
6217 /* If there's already a binding for this NAME, then we don't have
6218 anything to worry about. */
6219 if (lookup_member (current_class_type
, name
,
6220 /*protect=*/0, /*want_type=*/false))
6223 if (!current_class_stack
[current_class_depth
- 1].names_used
)
6224 current_class_stack
[current_class_depth
- 1].names_used
6225 = splay_tree_new (splay_tree_compare_pointers
, 0, 0);
6226 names_used
= current_class_stack
[current_class_depth
- 1].names_used
;
6228 splay_tree_insert (names_used
,
6229 (splay_tree_key
) name
,
6230 (splay_tree_value
) decl
);
6233 /* Note that NAME was declared (as DECL) in the current class. Check
6234 to see that the declaration is valid. */
6237 note_name_declared_in_class (tree name
, tree decl
)
6239 splay_tree names_used
;
6242 /* Look to see if we ever used this name. */
6244 = current_class_stack
[current_class_depth
- 1].names_used
;
6248 n
= splay_tree_lookup (names_used
, (splay_tree_key
) name
);
6251 /* [basic.scope.class]
6253 A name N used in a class S shall refer to the same declaration
6254 in its context and when re-evaluated in the completed scope of
6256 error ("declaration of %q#D", decl
);
6257 cp_error_at ("changes meaning of %qD from %q+#D",
6258 DECL_NAME (OVL_CURRENT (decl
)),
6263 /* Returns the VAR_DECL for the complete vtable associated with BINFO.
6264 Secondary vtables are merged with primary vtables; this function
6265 will return the VAR_DECL for the primary vtable. */
6268 get_vtbl_decl_for_binfo (tree binfo
)
6272 decl
= BINFO_VTABLE (binfo
);
6273 if (decl
&& TREE_CODE (decl
) == PLUS_EXPR
)
6275 gcc_assert (TREE_CODE (TREE_OPERAND (decl
, 0)) == ADDR_EXPR
);
6276 decl
= TREE_OPERAND (TREE_OPERAND (decl
, 0), 0);
6279 gcc_assert (TREE_CODE (decl
) == VAR_DECL
);
6284 /* Returns the binfo for the primary base of BINFO. If the resulting
6285 BINFO is a virtual base, and it is inherited elsewhere in the
6286 hierarchy, then the returned binfo might not be the primary base of
6287 BINFO in the complete object. Check BINFO_PRIMARY_P or
6288 BINFO_LOST_PRIMARY_P to be sure. */
6291 get_primary_binfo (tree binfo
)
6296 primary_base
= CLASSTYPE_PRIMARY_BINFO (BINFO_TYPE (binfo
));
6300 result
= copied_binfo (primary_base
, binfo
);
6304 /* If INDENTED_P is zero, indent to INDENT. Return nonzero. */
6307 maybe_indent_hierarchy (FILE * stream
, int indent
, int indented_p
)
6310 fprintf (stream
, "%*s", indent
, "");
6314 /* Dump the offsets of all the bases rooted at BINFO to STREAM.
6315 INDENT should be zero when called from the top level; it is
6316 incremented recursively. IGO indicates the next expected BINFO in
6317 inheritance graph ordering. */
6320 dump_class_hierarchy_r (FILE *stream
,
6330 indented
= maybe_indent_hierarchy (stream
, indent
, 0);
6331 fprintf (stream
, "%s (0x%lx) ",
6332 type_as_string (BINFO_TYPE (binfo
), TFF_PLAIN_IDENTIFIER
),
6333 (unsigned long) binfo
);
6336 fprintf (stream
, "alternative-path\n");
6339 igo
= TREE_CHAIN (binfo
);
6341 fprintf (stream
, HOST_WIDE_INT_PRINT_DEC
,
6342 tree_low_cst (BINFO_OFFSET (binfo
), 0));
6343 if (is_empty_class (BINFO_TYPE (binfo
)))
6344 fprintf (stream
, " empty");
6345 else if (CLASSTYPE_NEARLY_EMPTY_P (BINFO_TYPE (binfo
)))
6346 fprintf (stream
, " nearly-empty");
6347 if (BINFO_VIRTUAL_P (binfo
))
6348 fprintf (stream
, " virtual");
6349 fprintf (stream
, "\n");
6352 if (BINFO_PRIMARY_P (binfo
))
6354 indented
= maybe_indent_hierarchy (stream
, indent
+ 3, indented
);
6355 fprintf (stream
, " primary-for %s (0x%lx)",
6356 type_as_string (BINFO_TYPE (BINFO_INHERITANCE_CHAIN (binfo
)),
6357 TFF_PLAIN_IDENTIFIER
),
6358 (unsigned long)BINFO_INHERITANCE_CHAIN (binfo
));
6360 if (BINFO_LOST_PRIMARY_P (binfo
))
6362 indented
= maybe_indent_hierarchy (stream
, indent
+ 3, indented
);
6363 fprintf (stream
, " lost-primary");
6366 fprintf (stream
, "\n");
6368 if (!(flags
& TDF_SLIM
))
6372 if (BINFO_SUBVTT_INDEX (binfo
))
6374 indented
= maybe_indent_hierarchy (stream
, indent
+ 3, indented
);
6375 fprintf (stream
, " subvttidx=%s",
6376 expr_as_string (BINFO_SUBVTT_INDEX (binfo
),
6377 TFF_PLAIN_IDENTIFIER
));
6379 if (BINFO_VPTR_INDEX (binfo
))
6381 indented
= maybe_indent_hierarchy (stream
, indent
+ 3, indented
);
6382 fprintf (stream
, " vptridx=%s",
6383 expr_as_string (BINFO_VPTR_INDEX (binfo
),
6384 TFF_PLAIN_IDENTIFIER
));
6386 if (BINFO_VPTR_FIELD (binfo
))
6388 indented
= maybe_indent_hierarchy (stream
, indent
+ 3, indented
);
6389 fprintf (stream
, " vbaseoffset=%s",
6390 expr_as_string (BINFO_VPTR_FIELD (binfo
),
6391 TFF_PLAIN_IDENTIFIER
));
6393 if (BINFO_VTABLE (binfo
))
6395 indented
= maybe_indent_hierarchy (stream
, indent
+ 3, indented
);
6396 fprintf (stream
, " vptr=%s",
6397 expr_as_string (BINFO_VTABLE (binfo
),
6398 TFF_PLAIN_IDENTIFIER
));
6402 fprintf (stream
, "\n");
6405 for (i
= 0; BINFO_BASE_ITERATE (binfo
, i
, base_binfo
); i
++)
6406 igo
= dump_class_hierarchy_r (stream
, flags
, base_binfo
, igo
, indent
+ 2);
6411 /* Dump the BINFO hierarchy for T. */
6414 dump_class_hierarchy_1 (FILE *stream
, int flags
, tree t
)
6416 fprintf (stream
, "Class %s\n", type_as_string (t
, TFF_PLAIN_IDENTIFIER
));
6417 fprintf (stream
, " size=%lu align=%lu\n",
6418 (unsigned long)(tree_low_cst (TYPE_SIZE (t
), 0) / BITS_PER_UNIT
),
6419 (unsigned long)(TYPE_ALIGN (t
) / BITS_PER_UNIT
));
6420 fprintf (stream
, " base size=%lu base align=%lu\n",
6421 (unsigned long)(tree_low_cst (TYPE_SIZE (CLASSTYPE_AS_BASE (t
)), 0)
6423 (unsigned long)(TYPE_ALIGN (CLASSTYPE_AS_BASE (t
))
6425 dump_class_hierarchy_r (stream
, flags
, TYPE_BINFO (t
), TYPE_BINFO (t
), 0);
6426 fprintf (stream
, "\n");
6429 /* Debug interface to hierarchy dumping. */
6432 debug_class (tree t
)
6434 dump_class_hierarchy_1 (stderr
, TDF_SLIM
, t
);
6438 dump_class_hierarchy (tree t
)
6441 FILE *stream
= dump_begin (TDI_class
, &flags
);
6445 dump_class_hierarchy_1 (stream
, flags
, t
);
6446 dump_end (TDI_class
, stream
);
6451 dump_array (FILE * stream
, tree decl
)
6456 tree size
= TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (decl
)));
6458 elt
= (tree_low_cst (TYPE_SIZE (TREE_TYPE (TREE_TYPE (decl
))), 0)
6460 fprintf (stream
, "%s:", decl_as_string (decl
, TFF_PLAIN_IDENTIFIER
));
6461 fprintf (stream
, " %s entries",
6462 expr_as_string (size_binop (PLUS_EXPR
, size
, size_one_node
),
6463 TFF_PLAIN_IDENTIFIER
));
6464 fprintf (stream
, "\n");
6466 for (ix
= 0, inits
= CONSTRUCTOR_ELTS (DECL_INITIAL (decl
));
6467 inits
; ix
++, inits
= TREE_CHAIN (inits
))
6468 fprintf (stream
, "%-4ld %s\n", (long)(ix
* elt
),
6469 expr_as_string (TREE_VALUE (inits
), TFF_PLAIN_IDENTIFIER
));
6473 dump_vtable (tree t
, tree binfo
, tree vtable
)
6476 FILE *stream
= dump_begin (TDI_class
, &flags
);
6481 if (!(flags
& TDF_SLIM
))
6483 int ctor_vtbl_p
= TYPE_BINFO (t
) != binfo
;
6485 fprintf (stream
, "%s for %s",
6486 ctor_vtbl_p
? "Construction vtable" : "Vtable",
6487 type_as_string (BINFO_TYPE (binfo
), TFF_PLAIN_IDENTIFIER
));
6490 if (!BINFO_VIRTUAL_P (binfo
))
6491 fprintf (stream
, " (0x%lx instance)", (unsigned long)binfo
);
6492 fprintf (stream
, " in %s", type_as_string (t
, TFF_PLAIN_IDENTIFIER
));
6494 fprintf (stream
, "\n");
6495 dump_array (stream
, vtable
);
6496 fprintf (stream
, "\n");
6499 dump_end (TDI_class
, stream
);
6503 dump_vtt (tree t
, tree vtt
)
6506 FILE *stream
= dump_begin (TDI_class
, &flags
);
6511 if (!(flags
& TDF_SLIM
))
6513 fprintf (stream
, "VTT for %s\n",
6514 type_as_string (t
, TFF_PLAIN_IDENTIFIER
));
6515 dump_array (stream
, vtt
);
6516 fprintf (stream
, "\n");
6519 dump_end (TDI_class
, stream
);
6522 /* Dump a function or thunk and its thunkees. */
6525 dump_thunk (FILE *stream
, int indent
, tree thunk
)
6527 static const char spaces
[] = " ";
6528 tree name
= DECL_NAME (thunk
);
6531 fprintf (stream
, "%.*s%p %s %s", indent
, spaces
,
6533 !DECL_THUNK_P (thunk
) ? "function"
6534 : DECL_THIS_THUNK_P (thunk
) ? "this-thunk" : "covariant-thunk",
6535 name
? IDENTIFIER_POINTER (name
) : "<unset>");
6536 if (DECL_THUNK_P (thunk
))
6538 HOST_WIDE_INT fixed_adjust
= THUNK_FIXED_OFFSET (thunk
);
6539 tree virtual_adjust
= THUNK_VIRTUAL_OFFSET (thunk
);
6541 fprintf (stream
, " fixed=" HOST_WIDE_INT_PRINT_DEC
, fixed_adjust
);
6542 if (!virtual_adjust
)
6544 else if (DECL_THIS_THUNK_P (thunk
))
6545 fprintf (stream
, " vcall=" HOST_WIDE_INT_PRINT_DEC
,
6546 tree_low_cst (virtual_adjust
, 0));
6548 fprintf (stream
, " vbase=" HOST_WIDE_INT_PRINT_DEC
"(%s)",
6549 tree_low_cst (BINFO_VPTR_FIELD (virtual_adjust
), 0),
6550 type_as_string (BINFO_TYPE (virtual_adjust
), TFF_SCOPE
));
6551 if (THUNK_ALIAS (thunk
))
6552 fprintf (stream
, " alias to %p", (void *)THUNK_ALIAS (thunk
));
6554 fprintf (stream
, "\n");
6555 for (thunks
= DECL_THUNKS (thunk
); thunks
; thunks
= TREE_CHAIN (thunks
))
6556 dump_thunk (stream
, indent
+ 2, thunks
);
6559 /* Dump the thunks for FN. */
6562 debug_thunks (tree fn
)
6564 dump_thunk (stderr
, 0, fn
);
6567 /* Virtual function table initialization. */
6569 /* Create all the necessary vtables for T and its base classes. */
6572 finish_vtbls (tree t
)
6577 /* We lay out the primary and secondary vtables in one contiguous
6578 vtable. The primary vtable is first, followed by the non-virtual
6579 secondary vtables in inheritance graph order. */
6580 list
= build_tree_list (BINFO_VTABLE (TYPE_BINFO (t
)), NULL_TREE
);
6581 accumulate_vtbl_inits (TYPE_BINFO (t
), TYPE_BINFO (t
),
6582 TYPE_BINFO (t
), t
, list
);
6584 /* Then come the virtual bases, also in inheritance graph order. */
6585 for (vbase
= TYPE_BINFO (t
); vbase
; vbase
= TREE_CHAIN (vbase
))
6587 if (!BINFO_VIRTUAL_P (vbase
))
6589 accumulate_vtbl_inits (vbase
, vbase
, TYPE_BINFO (t
), t
, list
);
6592 if (BINFO_VTABLE (TYPE_BINFO (t
)))
6593 initialize_vtable (TYPE_BINFO (t
), TREE_VALUE (list
));
6596 /* Initialize the vtable for BINFO with the INITS. */
6599 initialize_vtable (tree binfo
, tree inits
)
6603 layout_vtable_decl (binfo
, list_length (inits
));
6604 decl
= get_vtbl_decl_for_binfo (binfo
);
6605 initialize_artificial_var (decl
, inits
);
6606 dump_vtable (BINFO_TYPE (binfo
), binfo
, decl
);
6609 /* Build the VTT (virtual table table) for T.
6610 A class requires a VTT if it has virtual bases.
6613 1 - primary virtual pointer for complete object T
6614 2 - secondary VTTs for each direct non-virtual base of T which requires a
6616 3 - secondary virtual pointers for each direct or indirect base of T which
6617 has virtual bases or is reachable via a virtual path from T.
6618 4 - secondary VTTs for each direct or indirect virtual base of T.
6620 Secondary VTTs look like complete object VTTs without part 4. */
6630 /* Build up the initializers for the VTT. */
6632 index
= size_zero_node
;
6633 build_vtt_inits (TYPE_BINFO (t
), t
, &inits
, &index
);
6635 /* If we didn't need a VTT, we're done. */
6639 /* Figure out the type of the VTT. */
6640 type
= build_index_type (size_int (list_length (inits
) - 1));
6641 type
= build_cplus_array_type (const_ptr_type_node
, type
);
6643 /* Now, build the VTT object itself. */
6644 vtt
= build_vtable (t
, get_vtt_name (t
), type
);
6645 initialize_artificial_var (vtt
, inits
);
6646 /* Add the VTT to the vtables list. */
6647 TREE_CHAIN (vtt
) = TREE_CHAIN (CLASSTYPE_VTABLES (t
));
6648 TREE_CHAIN (CLASSTYPE_VTABLES (t
)) = vtt
;
6653 /* When building a secondary VTT, BINFO_VTABLE is set to a TREE_LIST with
6654 PURPOSE the RTTI_BINFO, VALUE the real vtable pointer for this binfo,
6655 and CHAIN the vtable pointer for this binfo after construction is
6656 complete. VALUE can also be another BINFO, in which case we recurse. */
6659 binfo_ctor_vtable (tree binfo
)
6665 vt
= BINFO_VTABLE (binfo
);
6666 if (TREE_CODE (vt
) == TREE_LIST
)
6667 vt
= TREE_VALUE (vt
);
6668 if (TREE_CODE (vt
) == TREE_BINFO
)
6677 /* Data for secondary VTT initialization. */
6678 typedef struct secondary_vptr_vtt_init_data_s
6680 /* Is this the primary VTT? */
6683 /* Current index into the VTT. */
6686 /* TREE_LIST of initializers built up. */
6689 /* The type being constructed by this secondary VTT. */
6690 tree type_being_constructed
;
6691 } secondary_vptr_vtt_init_data
;
6693 /* Recursively build the VTT-initializer for BINFO (which is in the
6694 hierarchy dominated by T). INITS points to the end of the initializer
6695 list to date. INDEX is the VTT index where the next element will be
6696 replaced. Iff BINFO is the binfo for T, this is the top level VTT (i.e.
6697 not a subvtt for some base of T). When that is so, we emit the sub-VTTs
6698 for virtual bases of T. When it is not so, we build the constructor
6699 vtables for the BINFO-in-T variant. */
6702 build_vtt_inits (tree binfo
, tree t
, tree
*inits
, tree
*index
)
6707 tree secondary_vptrs
;
6708 secondary_vptr_vtt_init_data data
;
6709 int top_level_p
= SAME_BINFO_TYPE_P (BINFO_TYPE (binfo
), t
);
6711 /* We only need VTTs for subobjects with virtual bases. */
6712 if (!CLASSTYPE_VBASECLASSES (BINFO_TYPE (binfo
)))
6715 /* We need to use a construction vtable if this is not the primary
6719 build_ctor_vtbl_group (binfo
, t
);
6721 /* Record the offset in the VTT where this sub-VTT can be found. */
6722 BINFO_SUBVTT_INDEX (binfo
) = *index
;
6725 /* Add the address of the primary vtable for the complete object. */
6726 init
= binfo_ctor_vtable (binfo
);
6727 *inits
= build_tree_list (NULL_TREE
, init
);
6728 inits
= &TREE_CHAIN (*inits
);
6731 gcc_assert (!BINFO_VPTR_INDEX (binfo
));
6732 BINFO_VPTR_INDEX (binfo
) = *index
;
6734 *index
= size_binop (PLUS_EXPR
, *index
, TYPE_SIZE_UNIT (ptr_type_node
));
6736 /* Recursively add the secondary VTTs for non-virtual bases. */
6737 for (i
= 0; BINFO_BASE_ITERATE (binfo
, i
, b
); ++i
)
6738 if (!BINFO_VIRTUAL_P (b
))
6739 inits
= build_vtt_inits (b
, t
, inits
, index
);
6741 /* Add secondary virtual pointers for all subobjects of BINFO with
6742 either virtual bases or reachable along a virtual path, except
6743 subobjects that are non-virtual primary bases. */
6744 data
.top_level_p
= top_level_p
;
6745 data
.index
= *index
;
6747 data
.type_being_constructed
= BINFO_TYPE (binfo
);
6749 dfs_walk_once (binfo
, dfs_build_secondary_vptr_vtt_inits
, NULL
, &data
);
6751 *index
= data
.index
;
6753 /* The secondary vptrs come back in reverse order. After we reverse
6754 them, and add the INITS, the last init will be the first element
6756 secondary_vptrs
= data
.inits
;
6757 if (secondary_vptrs
)
6759 *inits
= nreverse (secondary_vptrs
);
6760 inits
= &TREE_CHAIN (secondary_vptrs
);
6761 gcc_assert (*inits
== NULL_TREE
);
6765 /* Add the secondary VTTs for virtual bases in inheritance graph
6767 for (b
= TYPE_BINFO (BINFO_TYPE (binfo
)); b
; b
= TREE_CHAIN (b
))
6769 if (!BINFO_VIRTUAL_P (b
))
6772 inits
= build_vtt_inits (b
, t
, inits
, index
);
6775 /* Remove the ctor vtables we created. */
6776 dfs_walk_all (binfo
, dfs_fixup_binfo_vtbls
, NULL
, binfo
);
6781 /* Called from build_vtt_inits via dfs_walk. BINFO is the binfo for the base
6782 in most derived. DATA is a SECONDARY_VPTR_VTT_INIT_DATA structure. */
6785 dfs_build_secondary_vptr_vtt_inits (tree binfo
, void *data_
)
6787 secondary_vptr_vtt_init_data
*data
= (secondary_vptr_vtt_init_data
*)data_
;
6789 /* We don't care about bases that don't have vtables. */
6790 if (!TYPE_VFIELD (BINFO_TYPE (binfo
)))
6791 return dfs_skip_bases
;
6793 /* We're only interested in proper subobjects of the type being
6795 if (SAME_BINFO_TYPE_P (BINFO_TYPE (binfo
), data
->type_being_constructed
))
6798 /* We're only interested in bases with virtual bases or reachable
6799 via a virtual path from the type being constructed. */
6800 if (!(CLASSTYPE_VBASECLASSES (BINFO_TYPE (binfo
))
6801 || binfo_via_virtual (binfo
, data
->type_being_constructed
)))
6802 return dfs_skip_bases
;
6804 /* We're not interested in non-virtual primary bases. */
6805 if (!BINFO_VIRTUAL_P (binfo
) && BINFO_PRIMARY_P (binfo
))
6808 /* Record the index where this secondary vptr can be found. */
6809 if (data
->top_level_p
)
6811 gcc_assert (!BINFO_VPTR_INDEX (binfo
));
6812 BINFO_VPTR_INDEX (binfo
) = data
->index
;
6814 if (BINFO_VIRTUAL_P (binfo
))
6816 /* It's a primary virtual base, and this is not a
6817 construction vtable. Find the base this is primary of in
6818 the inheritance graph, and use that base's vtable
6820 while (BINFO_PRIMARY_P (binfo
))
6821 binfo
= BINFO_INHERITANCE_CHAIN (binfo
);
6825 /* Add the initializer for the secondary vptr itself. */
6826 data
->inits
= tree_cons (NULL_TREE
, binfo_ctor_vtable (binfo
), data
->inits
);
6828 /* Advance the vtt index. */
6829 data
->index
= size_binop (PLUS_EXPR
, data
->index
,
6830 TYPE_SIZE_UNIT (ptr_type_node
));
6835 /* Called from build_vtt_inits via dfs_walk. After building
6836 constructor vtables and generating the sub-vtt from them, we need
6837 to restore the BINFO_VTABLES that were scribbled on. DATA is the
6838 binfo of the base whose sub vtt was generated. */
6841 dfs_fixup_binfo_vtbls (tree binfo
, void* data
)
6843 tree vtable
= BINFO_VTABLE (binfo
);
6845 if (!TYPE_CONTAINS_VPTR_P (BINFO_TYPE (binfo
)))
6846 /* If this class has no vtable, none of its bases do. */
6847 return dfs_skip_bases
;
6850 /* This might be a primary base, so have no vtable in this
6854 /* If we scribbled the construction vtable vptr into BINFO, clear it
6856 if (TREE_CODE (vtable
) == TREE_LIST
6857 && (TREE_PURPOSE (vtable
) == (tree
) data
))
6858 BINFO_VTABLE (binfo
) = TREE_CHAIN (vtable
);
6863 /* Build the construction vtable group for BINFO which is in the
6864 hierarchy dominated by T. */
6867 build_ctor_vtbl_group (tree binfo
, tree t
)
6876 /* See if we've already created this construction vtable group. */
6877 id
= mangle_ctor_vtbl_for_type (t
, binfo
);
6878 if (IDENTIFIER_GLOBAL_VALUE (id
))
6881 gcc_assert (!SAME_BINFO_TYPE_P (BINFO_TYPE (binfo
), t
));
6882 /* Build a version of VTBL (with the wrong type) for use in
6883 constructing the addresses of secondary vtables in the
6884 construction vtable group. */
6885 vtbl
= build_vtable (t
, id
, ptr_type_node
);
6886 DECL_CONSTRUCTION_VTABLE_P (vtbl
) = 1;
6887 list
= build_tree_list (vtbl
, NULL_TREE
);
6888 accumulate_vtbl_inits (binfo
, TYPE_BINFO (TREE_TYPE (binfo
)),
6891 /* Add the vtables for each of our virtual bases using the vbase in T
6893 for (vbase
= TYPE_BINFO (BINFO_TYPE (binfo
));
6895 vbase
= TREE_CHAIN (vbase
))
6899 if (!BINFO_VIRTUAL_P (vbase
))
6901 b
= copied_binfo (vbase
, binfo
);
6903 accumulate_vtbl_inits (b
, vbase
, binfo
, t
, list
);
6905 inits
= TREE_VALUE (list
);
6907 /* Figure out the type of the construction vtable. */
6908 type
= build_index_type (size_int (list_length (inits
) - 1));
6909 type
= build_cplus_array_type (vtable_entry_type
, type
);
6910 TREE_TYPE (vtbl
) = type
;
6912 /* Initialize the construction vtable. */
6913 CLASSTYPE_VTABLES (t
) = chainon (CLASSTYPE_VTABLES (t
), vtbl
);
6914 initialize_artificial_var (vtbl
, inits
);
6915 dump_vtable (t
, binfo
, vtbl
);
6918 /* Add the vtbl initializers for BINFO (and its bases other than
6919 non-virtual primaries) to the list of INITS. BINFO is in the
6920 hierarchy dominated by T. RTTI_BINFO is the binfo within T of
6921 the constructor the vtbl inits should be accumulated for. (If this
6922 is the complete object vtbl then RTTI_BINFO will be TYPE_BINFO (T).)
6923 ORIG_BINFO is the binfo for this object within BINFO_TYPE (RTTI_BINFO).
6924 BINFO is the active base equivalent of ORIG_BINFO in the inheritance
6925 graph of T. Both BINFO and ORIG_BINFO will have the same BINFO_TYPE,
6926 but are not necessarily the same in terms of layout. */
6929 accumulate_vtbl_inits (tree binfo
,
6937 int ctor_vtbl_p
= !SAME_BINFO_TYPE_P (BINFO_TYPE (rtti_binfo
), t
);
6939 gcc_assert (SAME_BINFO_TYPE_P (BINFO_TYPE (binfo
), BINFO_TYPE (orig_binfo
)));
6941 /* If it doesn't have a vptr, we don't do anything. */
6942 if (!TYPE_CONTAINS_VPTR_P (BINFO_TYPE (binfo
)))
6945 /* If we're building a construction vtable, we're not interested in
6946 subobjects that don't require construction vtables. */
6948 && !CLASSTYPE_VBASECLASSES (BINFO_TYPE (binfo
))
6949 && !binfo_via_virtual (orig_binfo
, BINFO_TYPE (rtti_binfo
)))
6952 /* Build the initializers for the BINFO-in-T vtable. */
6954 = chainon (TREE_VALUE (inits
),
6955 dfs_accumulate_vtbl_inits (binfo
, orig_binfo
,
6956 rtti_binfo
, t
, inits
));
6958 /* Walk the BINFO and its bases. We walk in preorder so that as we
6959 initialize each vtable we can figure out at what offset the
6960 secondary vtable lies from the primary vtable. We can't use
6961 dfs_walk here because we need to iterate through bases of BINFO
6962 and RTTI_BINFO simultaneously. */
6963 for (i
= 0; BINFO_BASE_ITERATE (binfo
, i
, base_binfo
); ++i
)
6965 /* Skip virtual bases. */
6966 if (BINFO_VIRTUAL_P (base_binfo
))
6968 accumulate_vtbl_inits (base_binfo
,
6969 BINFO_BASE_BINFO (orig_binfo
, i
),
6975 /* Called from accumulate_vtbl_inits. Returns the initializers for
6976 the BINFO vtable. */
6979 dfs_accumulate_vtbl_inits (tree binfo
,
6985 tree inits
= NULL_TREE
;
6986 tree vtbl
= NULL_TREE
;
6987 int ctor_vtbl_p
= !SAME_BINFO_TYPE_P (BINFO_TYPE (rtti_binfo
), t
);
6990 && BINFO_VIRTUAL_P (orig_binfo
) && BINFO_PRIMARY_P (orig_binfo
))
6992 /* In the hierarchy of BINFO_TYPE (RTTI_BINFO), this is a
6993 primary virtual base. If it is not the same primary in
6994 the hierarchy of T, we'll need to generate a ctor vtable
6995 for it, to place at its location in T. If it is the same
6996 primary, we still need a VTT entry for the vtable, but it
6997 should point to the ctor vtable for the base it is a
6998 primary for within the sub-hierarchy of RTTI_BINFO.
7000 There are three possible cases:
7002 1) We are in the same place.
7003 2) We are a primary base within a lost primary virtual base of
7005 3) We are primary to something not a base of RTTI_BINFO. */
7008 tree last
= NULL_TREE
;
7010 /* First, look through the bases we are primary to for RTTI_BINFO
7011 or a virtual base. */
7013 while (BINFO_PRIMARY_P (b
))
7015 b
= BINFO_INHERITANCE_CHAIN (b
);
7017 if (BINFO_VIRTUAL_P (b
) || b
== rtti_binfo
)
7020 /* If we run out of primary links, keep looking down our
7021 inheritance chain; we might be an indirect primary. */
7022 for (b
= last
; b
; b
= BINFO_INHERITANCE_CHAIN (b
))
7023 if (BINFO_VIRTUAL_P (b
) || b
== rtti_binfo
)
7027 /* If we found RTTI_BINFO, this is case 1. If we found a virtual
7028 base B and it is a base of RTTI_BINFO, this is case 2. In
7029 either case, we share our vtable with LAST, i.e. the
7030 derived-most base within B of which we are a primary. */
7032 || (b
&& binfo_for_vbase (BINFO_TYPE (b
), BINFO_TYPE (rtti_binfo
))))
7033 /* Just set our BINFO_VTABLE to point to LAST, as we may not have
7034 set LAST's BINFO_VTABLE yet. We'll extract the actual vptr in
7035 binfo_ctor_vtable after everything's been set up. */
7038 /* Otherwise, this is case 3 and we get our own. */
7040 else if (!BINFO_NEW_VTABLE_MARKED (orig_binfo
))
7048 /* Compute the initializer for this vtable. */
7049 inits
= build_vtbl_initializer (binfo
, orig_binfo
, t
, rtti_binfo
,
7052 /* Figure out the position to which the VPTR should point. */
7053 vtbl
= TREE_PURPOSE (l
);
7054 vtbl
= build1 (ADDR_EXPR
, vtbl_ptr_type_node
, vtbl
);
7055 index
= size_binop (PLUS_EXPR
,
7056 size_int (non_fn_entries
),
7057 size_int (list_length (TREE_VALUE (l
))));
7058 index
= size_binop (MULT_EXPR
,
7059 TYPE_SIZE_UNIT (vtable_entry_type
),
7061 vtbl
= build2 (PLUS_EXPR
, TREE_TYPE (vtbl
), vtbl
, index
);
7065 /* For a construction vtable, we can't overwrite BINFO_VTABLE.
7066 So, we make a TREE_LIST. Later, dfs_fixup_binfo_vtbls will
7067 straighten this out. */
7068 BINFO_VTABLE (binfo
) = tree_cons (rtti_binfo
, vtbl
, BINFO_VTABLE (binfo
));
7069 else if (BINFO_PRIMARY_P (binfo
) && BINFO_VIRTUAL_P (binfo
))
7072 /* For an ordinary vtable, set BINFO_VTABLE. */
7073 BINFO_VTABLE (binfo
) = vtbl
;
7078 /* Construct the initializer for BINFO's virtual function table. BINFO
7079 is part of the hierarchy dominated by T. If we're building a
7080 construction vtable, the ORIG_BINFO is the binfo we should use to
7081 find the actual function pointers to put in the vtable - but they
7082 can be overridden on the path to most-derived in the graph that
7083 ORIG_BINFO belongs. Otherwise,
7084 ORIG_BINFO should be the same as BINFO. The RTTI_BINFO is the
7085 BINFO that should be indicated by the RTTI information in the
7086 vtable; it will be a base class of T, rather than T itself, if we
7087 are building a construction vtable.
7089 The value returned is a TREE_LIST suitable for wrapping in a
7090 CONSTRUCTOR to use as the DECL_INITIAL for a vtable. If
7091 NON_FN_ENTRIES_P is not NULL, *NON_FN_ENTRIES_P is set to the
7092 number of non-function entries in the vtable.
7094 It might seem that this function should never be called with a
7095 BINFO for which BINFO_PRIMARY_P holds, the vtable for such a
7096 base is always subsumed by a derived class vtable. However, when
7097 we are building construction vtables, we do build vtables for
7098 primary bases; we need these while the primary base is being
7102 build_vtbl_initializer (tree binfo
,
7106 int* non_fn_entries_p
)
7115 /* Initialize VID. */
7116 memset (&vid
, 0, sizeof (vid
));
7119 vid
.rtti_binfo
= rtti_binfo
;
7120 vid
.last_init
= &vid
.inits
;
7121 vid
.primary_vtbl_p
= SAME_BINFO_TYPE_P (BINFO_TYPE (binfo
), t
);
7122 vid
.ctor_vtbl_p
= !SAME_BINFO_TYPE_P (BINFO_TYPE (rtti_binfo
), t
);
7123 vid
.generate_vcall_entries
= true;
7124 /* The first vbase or vcall offset is at index -3 in the vtable. */
7125 vid
.index
= ssize_int(-3 * TARGET_VTABLE_DATA_ENTRY_DISTANCE
);
7127 /* Add entries to the vtable for RTTI. */
7128 build_rtti_vtbl_entries (binfo
, &vid
);
7130 /* Create an array for keeping track of the functions we've
7131 processed. When we see multiple functions with the same
7132 signature, we share the vcall offsets. */
7133 VARRAY_TREE_INIT (vid
.fns
, 32, "fns");
7134 /* Add the vcall and vbase offset entries. */
7135 build_vcall_and_vbase_vtbl_entries (binfo
, &vid
);
7137 /* Clear BINFO_VTABLE_PATH_MARKED; it's set by
7138 build_vbase_offset_vtbl_entries. */
7139 for (vbases
= CLASSTYPE_VBASECLASSES (t
), ix
= 0;
7140 VEC_iterate (tree
, vbases
, ix
, vbinfo
); ix
++)
7141 BINFO_VTABLE_PATH_MARKED (vbinfo
) = 0;
7143 /* If the target requires padding between data entries, add that now. */
7144 if (TARGET_VTABLE_DATA_ENTRY_DISTANCE
> 1)
7148 for (prev
= &vid
.inits
; (cur
= *prev
); prev
= &TREE_CHAIN (cur
))
7153 for (i
= 1; i
< TARGET_VTABLE_DATA_ENTRY_DISTANCE
; ++i
)
7154 add
= tree_cons (NULL_TREE
,
7155 build1 (NOP_EXPR
, vtable_entry_type
,
7162 if (non_fn_entries_p
)
7163 *non_fn_entries_p
= list_length (vid
.inits
);
7165 /* Go through all the ordinary virtual functions, building up
7167 vfun_inits
= NULL_TREE
;
7168 for (v
= BINFO_VIRTUALS (orig_binfo
); v
; v
= TREE_CHAIN (v
))
7172 tree fn
, fn_original
;
7173 tree init
= NULL_TREE
;
7177 if (DECL_THUNK_P (fn
))
7179 if (!DECL_NAME (fn
))
7181 if (THUNK_ALIAS (fn
))
7183 fn
= THUNK_ALIAS (fn
);
7186 fn_original
= THUNK_TARGET (fn
);
7189 /* If the only definition of this function signature along our
7190 primary base chain is from a lost primary, this vtable slot will
7191 never be used, so just zero it out. This is important to avoid
7192 requiring extra thunks which cannot be generated with the function.
7194 We first check this in update_vtable_entry_for_fn, so we handle
7195 restored primary bases properly; we also need to do it here so we
7196 zero out unused slots in ctor vtables, rather than filling themff
7197 with erroneous values (though harmless, apart from relocation
7199 for (b
= binfo
; ; b
= get_primary_binfo (b
))
7201 /* We found a defn before a lost primary; go ahead as normal. */
7202 if (look_for_overrides_here (BINFO_TYPE (b
), fn_original
))
7205 /* The nearest definition is from a lost primary; clear the
7207 if (BINFO_LOST_PRIMARY_P (b
))
7209 init
= size_zero_node
;
7216 /* Pull the offset for `this', and the function to call, out of
7218 delta
= BV_DELTA (v
);
7219 vcall_index
= BV_VCALL_INDEX (v
);
7221 gcc_assert (TREE_CODE (delta
) == INTEGER_CST
);
7222 gcc_assert (TREE_CODE (fn
) == FUNCTION_DECL
);
7224 /* You can't call an abstract virtual function; it's abstract.
7225 So, we replace these functions with __pure_virtual. */
7226 if (DECL_PURE_VIRTUAL_P (fn_original
))
7228 else if (!integer_zerop (delta
) || vcall_index
)
7230 fn
= make_thunk (fn
, /*this_adjusting=*/1, delta
, vcall_index
);
7231 if (!DECL_NAME (fn
))
7234 /* Take the address of the function, considering it to be of an
7235 appropriate generic type. */
7236 init
= build1 (ADDR_EXPR
, vfunc_ptr_type_node
, fn
);
7239 /* And add it to the chain of initializers. */
7240 if (TARGET_VTABLE_USES_DESCRIPTORS
)
7243 if (init
== size_zero_node
)
7244 for (i
= 0; i
< TARGET_VTABLE_USES_DESCRIPTORS
; ++i
)
7245 vfun_inits
= tree_cons (NULL_TREE
, init
, vfun_inits
);
7247 for (i
= 0; i
< TARGET_VTABLE_USES_DESCRIPTORS
; ++i
)
7249 tree fdesc
= build2 (FDESC_EXPR
, vfunc_ptr_type_node
,
7250 TREE_OPERAND (init
, 0),
7251 build_int_cst (NULL_TREE
, i
));
7252 TREE_CONSTANT (fdesc
) = 1;
7253 TREE_INVARIANT (fdesc
) = 1;
7255 vfun_inits
= tree_cons (NULL_TREE
, fdesc
, vfun_inits
);
7259 vfun_inits
= tree_cons (NULL_TREE
, init
, vfun_inits
);
7262 /* The initializers for virtual functions were built up in reverse
7263 order; straighten them out now. */
7264 vfun_inits
= nreverse (vfun_inits
);
7266 /* The negative offset initializers are also in reverse order. */
7267 vid
.inits
= nreverse (vid
.inits
);
7269 /* Chain the two together. */
7270 return chainon (vid
.inits
, vfun_inits
);
7273 /* Adds to vid->inits the initializers for the vbase and vcall
7274 offsets in BINFO, which is in the hierarchy dominated by T. */
7277 build_vcall_and_vbase_vtbl_entries (tree binfo
, vtbl_init_data
* vid
)
7281 /* If this is a derived class, we must first create entries
7282 corresponding to the primary base class. */
7283 b
= get_primary_binfo (binfo
);
7285 build_vcall_and_vbase_vtbl_entries (b
, vid
);
7287 /* Add the vbase entries for this base. */
7288 build_vbase_offset_vtbl_entries (binfo
, vid
);
7289 /* Add the vcall entries for this base. */
7290 build_vcall_offset_vtbl_entries (binfo
, vid
);
7293 /* Returns the initializers for the vbase offset entries in the vtable
7294 for BINFO (which is part of the class hierarchy dominated by T), in
7295 reverse order. VBASE_OFFSET_INDEX gives the vtable index
7296 where the next vbase offset will go. */
7299 build_vbase_offset_vtbl_entries (tree binfo
, vtbl_init_data
* vid
)
7303 tree non_primary_binfo
;
7305 /* If there are no virtual baseclasses, then there is nothing to
7307 if (!CLASSTYPE_VBASECLASSES (BINFO_TYPE (binfo
)))
7312 /* We might be a primary base class. Go up the inheritance hierarchy
7313 until we find the most derived class of which we are a primary base:
7314 it is the offset of that which we need to use. */
7315 non_primary_binfo
= binfo
;
7316 while (BINFO_INHERITANCE_CHAIN (non_primary_binfo
))
7320 /* If we have reached a virtual base, then it must be a primary
7321 base (possibly multi-level) of vid->binfo, or we wouldn't
7322 have called build_vcall_and_vbase_vtbl_entries for it. But it
7323 might be a lost primary, so just skip down to vid->binfo. */
7324 if (BINFO_VIRTUAL_P (non_primary_binfo
))
7326 non_primary_binfo
= vid
->binfo
;
7330 b
= BINFO_INHERITANCE_CHAIN (non_primary_binfo
);
7331 if (get_primary_binfo (b
) != non_primary_binfo
)
7333 non_primary_binfo
= b
;
7336 /* Go through the virtual bases, adding the offsets. */
7337 for (vbase
= TYPE_BINFO (BINFO_TYPE (binfo
));
7339 vbase
= TREE_CHAIN (vbase
))
7344 if (!BINFO_VIRTUAL_P (vbase
))
7347 /* Find the instance of this virtual base in the complete
7349 b
= copied_binfo (vbase
, binfo
);
7351 /* If we've already got an offset for this virtual base, we
7352 don't need another one. */
7353 if (BINFO_VTABLE_PATH_MARKED (b
))
7355 BINFO_VTABLE_PATH_MARKED (b
) = 1;
7357 /* Figure out where we can find this vbase offset. */
7358 delta
= size_binop (MULT_EXPR
,
7361 TYPE_SIZE_UNIT (vtable_entry_type
)));
7362 if (vid
->primary_vtbl_p
)
7363 BINFO_VPTR_FIELD (b
) = delta
;
7365 if (binfo
!= TYPE_BINFO (t
))
7366 /* The vbase offset had better be the same. */
7367 gcc_assert (tree_int_cst_equal (delta
, BINFO_VPTR_FIELD (vbase
)));
7369 /* The next vbase will come at a more negative offset. */
7370 vid
->index
= size_binop (MINUS_EXPR
, vid
->index
,
7371 ssize_int (TARGET_VTABLE_DATA_ENTRY_DISTANCE
));
7373 /* The initializer is the delta from BINFO to this virtual base.
7374 The vbase offsets go in reverse inheritance-graph order, and
7375 we are walking in inheritance graph order so these end up in
7377 delta
= size_diffop (BINFO_OFFSET (b
), BINFO_OFFSET (non_primary_binfo
));
7380 = build_tree_list (NULL_TREE
,
7381 fold (build1 (NOP_EXPR
,
7384 vid
->last_init
= &TREE_CHAIN (*vid
->last_init
);
7388 /* Adds the initializers for the vcall offset entries in the vtable
7389 for BINFO (which is part of the class hierarchy dominated by VID->DERIVED)
7393 build_vcall_offset_vtbl_entries (tree binfo
, vtbl_init_data
* vid
)
7395 /* We only need these entries if this base is a virtual base. We
7396 compute the indices -- but do not add to the vtable -- when
7397 building the main vtable for a class. */
7398 if (BINFO_VIRTUAL_P (binfo
) || binfo
== TYPE_BINFO (vid
->derived
))
7400 /* We need a vcall offset for each of the virtual functions in this
7401 vtable. For example:
7403 class A { virtual void f (); };
7404 class B1 : virtual public A { virtual void f (); };
7405 class B2 : virtual public A { virtual void f (); };
7406 class C: public B1, public B2 { virtual void f (); };
7408 A C object has a primary base of B1, which has a primary base of A. A
7409 C also has a secondary base of B2, which no longer has a primary base
7410 of A. So the B2-in-C construction vtable needs a secondary vtable for
7411 A, which will adjust the A* to a B2* to call f. We have no way of
7412 knowing what (or even whether) this offset will be when we define B2,
7413 so we store this "vcall offset" in the A sub-vtable and look it up in
7414 a "virtual thunk" for B2::f.
7416 We need entries for all the functions in our primary vtable and
7417 in our non-virtual bases' secondary vtables. */
7419 /* If we are just computing the vcall indices -- but do not need
7420 the actual entries -- not that. */
7421 if (!BINFO_VIRTUAL_P (binfo
))
7422 vid
->generate_vcall_entries
= false;
7423 /* Now, walk through the non-virtual bases, adding vcall offsets. */
7424 add_vcall_offset_vtbl_entries_r (binfo
, vid
);
7428 /* Build vcall offsets, starting with those for BINFO. */
7431 add_vcall_offset_vtbl_entries_r (tree binfo
, vtbl_init_data
* vid
)
7437 /* Don't walk into virtual bases -- except, of course, for the
7438 virtual base for which we are building vcall offsets. Any
7439 primary virtual base will have already had its offsets generated
7440 through the recursion in build_vcall_and_vbase_vtbl_entries. */
7441 if (BINFO_VIRTUAL_P (binfo
) && vid
->vbase
!= binfo
)
7444 /* If BINFO has a primary base, process it first. */
7445 primary_binfo
= get_primary_binfo (binfo
);
7447 add_vcall_offset_vtbl_entries_r (primary_binfo
, vid
);
7449 /* Add BINFO itself to the list. */
7450 add_vcall_offset_vtbl_entries_1 (binfo
, vid
);
7452 /* Scan the non-primary bases of BINFO. */
7453 for (i
= 0; BINFO_BASE_ITERATE (binfo
, i
, base_binfo
); ++i
)
7454 if (base_binfo
!= primary_binfo
)
7455 add_vcall_offset_vtbl_entries_r (base_binfo
, vid
);
7458 /* Called from build_vcall_offset_vtbl_entries_r. */
7461 add_vcall_offset_vtbl_entries_1 (tree binfo
, vtbl_init_data
* vid
)
7463 /* Make entries for the rest of the virtuals. */
7464 if (abi_version_at_least (2))
7468 /* The ABI requires that the methods be processed in declaration
7469 order. G++ 3.2 used the order in the vtable. */
7470 for (orig_fn
= TYPE_METHODS (BINFO_TYPE (binfo
));
7472 orig_fn
= TREE_CHAIN (orig_fn
))
7473 if (DECL_VINDEX (orig_fn
))
7474 add_vcall_offset (orig_fn
, binfo
, vid
);
7478 tree derived_virtuals
;
7481 /* If BINFO is a primary base, the most derived class which has
7482 BINFO as a primary base; otherwise, just BINFO. */
7483 tree non_primary_binfo
;
7485 /* We might be a primary base class. Go up the inheritance hierarchy
7486 until we find the most derived class of which we are a primary base:
7487 it is the BINFO_VIRTUALS there that we need to consider. */
7488 non_primary_binfo
= binfo
;
7489 while (BINFO_INHERITANCE_CHAIN (non_primary_binfo
))
7493 /* If we have reached a virtual base, then it must be vid->vbase,
7494 because we ignore other virtual bases in
7495 add_vcall_offset_vtbl_entries_r. In turn, it must be a primary
7496 base (possibly multi-level) of vid->binfo, or we wouldn't
7497 have called build_vcall_and_vbase_vtbl_entries for it. But it
7498 might be a lost primary, so just skip down to vid->binfo. */
7499 if (BINFO_VIRTUAL_P (non_primary_binfo
))
7501 gcc_assert (non_primary_binfo
== vid
->vbase
);
7502 non_primary_binfo
= vid
->binfo
;
7506 b
= BINFO_INHERITANCE_CHAIN (non_primary_binfo
);
7507 if (get_primary_binfo (b
) != non_primary_binfo
)
7509 non_primary_binfo
= b
;
7512 if (vid
->ctor_vtbl_p
)
7513 /* For a ctor vtable we need the equivalent binfo within the hierarchy
7514 where rtti_binfo is the most derived type. */
7516 = original_binfo (non_primary_binfo
, vid
->rtti_binfo
);
7518 for (base_virtuals
= BINFO_VIRTUALS (binfo
),
7519 derived_virtuals
= BINFO_VIRTUALS (non_primary_binfo
),
7520 orig_virtuals
= BINFO_VIRTUALS (TYPE_BINFO (BINFO_TYPE (binfo
)));
7522 base_virtuals
= TREE_CHAIN (base_virtuals
),
7523 derived_virtuals
= TREE_CHAIN (derived_virtuals
),
7524 orig_virtuals
= TREE_CHAIN (orig_virtuals
))
7528 /* Find the declaration that originally caused this function to
7529 be present in BINFO_TYPE (binfo). */
7530 orig_fn
= BV_FN (orig_virtuals
);
7532 /* When processing BINFO, we only want to generate vcall slots for
7533 function slots introduced in BINFO. So don't try to generate
7534 one if the function isn't even defined in BINFO. */
7535 if (!SAME_BINFO_TYPE_P (BINFO_TYPE (binfo
), DECL_CONTEXT (orig_fn
)))
7538 add_vcall_offset (orig_fn
, binfo
, vid
);
7543 /* Add a vcall offset entry for ORIG_FN to the vtable. */
7546 add_vcall_offset (tree orig_fn
, tree binfo
, vtbl_init_data
*vid
)
7551 /* If there is already an entry for a function with the same
7552 signature as FN, then we do not need a second vcall offset.
7553 Check the list of functions already present in the derived
7555 for (i
= 0; i
< VARRAY_ACTIVE_SIZE (vid
->fns
); ++i
)
7559 derived_entry
= VARRAY_TREE (vid
->fns
, i
);
7560 if (same_signature_p (derived_entry
, orig_fn
)
7561 /* We only use one vcall offset for virtual destructors,
7562 even though there are two virtual table entries. */
7563 || (DECL_DESTRUCTOR_P (derived_entry
)
7564 && DECL_DESTRUCTOR_P (orig_fn
)))
7568 /* If we are building these vcall offsets as part of building
7569 the vtable for the most derived class, remember the vcall
7571 if (vid
->binfo
== TYPE_BINFO (vid
->derived
))
7573 tree_pair_p elt
= VEC_safe_push (tree_pair_s
,
7574 CLASSTYPE_VCALL_INDICES (vid
->derived
),
7576 elt
->purpose
= orig_fn
;
7577 elt
->value
= vid
->index
;
7580 /* The next vcall offset will be found at a more negative
7582 vid
->index
= size_binop (MINUS_EXPR
, vid
->index
,
7583 ssize_int (TARGET_VTABLE_DATA_ENTRY_DISTANCE
));
7585 /* Keep track of this function. */
7586 VARRAY_PUSH_TREE (vid
->fns
, orig_fn
);
7588 if (vid
->generate_vcall_entries
)
7593 /* Find the overriding function. */
7594 fn
= find_final_overrider (vid
->rtti_binfo
, binfo
, orig_fn
);
7595 if (fn
== error_mark_node
)
7596 vcall_offset
= build1 (NOP_EXPR
, vtable_entry_type
,
7600 base
= TREE_VALUE (fn
);
7602 /* The vbase we're working on is a primary base of
7603 vid->binfo. But it might be a lost primary, so its
7604 BINFO_OFFSET might be wrong, so we just use the
7605 BINFO_OFFSET from vid->binfo. */
7606 vcall_offset
= size_diffop (BINFO_OFFSET (base
),
7607 BINFO_OFFSET (vid
->binfo
));
7608 vcall_offset
= fold (build1 (NOP_EXPR
, vtable_entry_type
,
7611 /* Add the initializer to the vtable. */
7612 *vid
->last_init
= build_tree_list (NULL_TREE
, vcall_offset
);
7613 vid
->last_init
= &TREE_CHAIN (*vid
->last_init
);
7617 /* Return vtbl initializers for the RTTI entries corresponding to the
7618 BINFO's vtable. The RTTI entries should indicate the object given
7619 by VID->rtti_binfo. */
7622 build_rtti_vtbl_entries (tree binfo
, vtbl_init_data
* vid
)
7631 basetype
= BINFO_TYPE (binfo
);
7632 t
= BINFO_TYPE (vid
->rtti_binfo
);
7634 /* To find the complete object, we will first convert to our most
7635 primary base, and then add the offset in the vtbl to that value. */
7637 while (CLASSTYPE_HAS_PRIMARY_BASE_P (BINFO_TYPE (b
))
7638 && !BINFO_LOST_PRIMARY_P (b
))
7642 primary_base
= get_primary_binfo (b
);
7643 gcc_assert (BINFO_PRIMARY_P (primary_base
)
7644 && BINFO_INHERITANCE_CHAIN (primary_base
) == b
);
7647 offset
= size_diffop (BINFO_OFFSET (vid
->rtti_binfo
), BINFO_OFFSET (b
));
7649 /* The second entry is the address of the typeinfo object. */
7651 decl
= build_address (get_tinfo_decl (t
));
7653 decl
= integer_zero_node
;
7655 /* Convert the declaration to a type that can be stored in the
7657 init
= build_nop (vfunc_ptr_type_node
, decl
);
7658 *vid
->last_init
= build_tree_list (NULL_TREE
, init
);
7659 vid
->last_init
= &TREE_CHAIN (*vid
->last_init
);
7661 /* Add the offset-to-top entry. It comes earlier in the vtable that
7662 the the typeinfo entry. Convert the offset to look like a
7663 function pointer, so that we can put it in the vtable. */
7664 init
= build_nop (vfunc_ptr_type_node
, offset
);
7665 *vid
->last_init
= build_tree_list (NULL_TREE
, init
);
7666 vid
->last_init
= &TREE_CHAIN (*vid
->last_init
);
7669 /* Fold a OBJ_TYPE_REF expression to the address of a function.
7670 KNOWN_TYPE carries the true type of OBJ_TYPE_REF_OBJECT(REF). */
7673 cp_fold_obj_type_ref (tree ref
, tree known_type
)
7675 HOST_WIDE_INT index
= tree_low_cst (OBJ_TYPE_REF_TOKEN (ref
), 1);
7676 HOST_WIDE_INT i
= 0;
7677 tree v
= BINFO_VIRTUALS (TYPE_BINFO (known_type
));
7682 i
+= (TARGET_VTABLE_USES_DESCRIPTORS
7683 ? TARGET_VTABLE_USES_DESCRIPTORS
: 1);
7689 #ifdef ENABLE_CHECKING
7690 gcc_assert (tree_int_cst_equal (OBJ_TYPE_REF_TOKEN (ref
),
7691 DECL_VINDEX (fndecl
)));
7694 return build_address (fndecl
);