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. OBJECT is an expression whose
430 type is a class type or a pointer to a class type. In the former
431 case, TYPE is also a class type; in the latter it is another
432 pointer type. If CHECK_ACCESS is true, an error message is emitted
433 if TYPE is inaccessible. If OBJECT has pointer type, the value is
434 assumed to be non-NULL. */
437 convert_to_base (tree object, tree type, bool check_access, bool nonnull)
442 if (TYPE_PTR_P (TREE_TYPE (object)))
444 object_type = TREE_TYPE (TREE_TYPE (object));
445 type = TREE_TYPE (type);
448 object_type = TREE_TYPE (object);
450 binfo = lookup_base (object_type, type,
451 check_access ? ba_check : ba_unique,
453 if (!binfo || binfo == error_mark_node)
454 return error_mark_node;
456 return build_base_path (PLUS_EXPR, object, binfo, nonnull);
459 /* EXPR is an expression with unqualified class type. BASE is a base
460 binfo of that class type. Returns EXPR, converted to the BASE
461 type. This function assumes that EXPR is the most derived class;
462 therefore virtual bases can be found at their static offsets. */
465 convert_to_base_statically (tree expr, tree base)
469 expr_type = TREE_TYPE (expr);
470 if (!SAME_BINFO_TYPE_P (BINFO_TYPE (base), expr_type))
474 pointer_type = build_pointer_type (expr_type);
475 expr = build_unary_op (ADDR_EXPR, expr, /*noconvert=*/1);
476 if (!integer_zerop (BINFO_OFFSET (base)))
477 expr = build2 (PLUS_EXPR, pointer_type, expr,
478 build_nop (pointer_type, BINFO_OFFSET (base)));
479 expr = build_nop (build_pointer_type (BINFO_TYPE (base)), expr);
480 expr = build1 (INDIRECT_REF, BINFO_TYPE (base), expr);
488 build_vfield_ref (tree datum, tree type)
490 tree vfield, vcontext;
492 if (datum == error_mark_node)
493 return error_mark_node;
495 if (TREE_CODE (TREE_TYPE (datum)) == REFERENCE_TYPE)
496 datum = convert_from_reference (datum);
498 /* First, convert to the requested type. */
499 if (!same_type_ignoring_top_level_qualifiers_p (TREE_TYPE (datum), type))
500 datum = convert_to_base (datum, type, /*check_access=*/false,
503 /* Second, the requested type may not be the owner of its own vptr.
504 If not, convert to the base class that owns it. We cannot use
505 convert_to_base here, because VCONTEXT may appear more than once
506 in the inheritance hierarchy of TYPE, and thus direct conversion
507 between the types may be ambiguous. Following the path back up
508 one step at a time via primary bases avoids the problem. */
509 vfield = TYPE_VFIELD (type);
510 vcontext = DECL_CONTEXT (vfield);
511 while (!same_type_ignoring_top_level_qualifiers_p (vcontext, type))
513 datum = build_simple_base_path (datum, CLASSTYPE_PRIMARY_BINFO (type));
514 type = TREE_TYPE (datum);
517 return build3 (COMPONENT_REF, TREE_TYPE (vfield), datum, vfield, NULL_TREE);
520 /* Given an object INSTANCE, return an expression which yields the
521 vtable element corresponding to INDEX. There are many special
522 cases for INSTANCE which we take care of here, mainly to avoid
523 creating extra tree nodes when we don't have to. */
526 build_vtbl_ref_1 (tree instance, tree idx)
529 tree vtbl = NULL_TREE;
531 /* Try to figure out what a reference refers to, and
532 access its virtual function table directly. */
535 tree fixed_type = fixed_type_or_null (instance, NULL, &cdtorp);
537 tree basetype = non_reference (TREE_TYPE (instance));
539 if (fixed_type && !cdtorp)
541 tree binfo = lookup_base (fixed_type, basetype,
542 ba_unique | ba_quiet, NULL);
544 vtbl = unshare_expr (BINFO_VTABLE (binfo));
548 vtbl = build_vfield_ref (instance, basetype);
550 assemble_external (vtbl);
552 aref = build_array_ref (vtbl, idx);
553 TREE_CONSTANT (aref) |= TREE_CONSTANT (vtbl) && TREE_CONSTANT (idx);
554 TREE_INVARIANT (aref) = TREE_CONSTANT (aref);
560 build_vtbl_ref (tree instance, tree idx)
562 tree aref = build_vtbl_ref_1 (instance, idx);
567 /* Given a stable object pointer INSTANCE_PTR, return an expression which
568 yields a function pointer corresponding to vtable element INDEX. */
571 build_vfn_ref (tree instance_ptr, tree idx)
575 aref = build_vtbl_ref_1 (build_indirect_ref (instance_ptr, 0), idx);
577 /* When using function descriptors, the address of the
578 vtable entry is treated as a function pointer. */
579 if (TARGET_VTABLE_USES_DESCRIPTORS)
580 aref = build1 (NOP_EXPR, TREE_TYPE (aref),
581 build_unary_op (ADDR_EXPR, aref, /*noconvert=*/1));
583 /* Remember this as a method reference, for later devirtualization. */
584 aref = build3 (OBJ_TYPE_REF, TREE_TYPE (aref), aref, instance_ptr, idx);
589 /* Return the name of the virtual function table (as an IDENTIFIER_NODE)
590 for the given TYPE. */
593 get_vtable_name (tree type)
595 return mangle_vtbl_for_type (type);
598 /* Return an IDENTIFIER_NODE for the name of the virtual table table
602 get_vtt_name (tree type)
604 return mangle_vtt_for_type (type);
607 /* DECL is an entity associated with TYPE, like a virtual table or an
608 implicitly generated constructor. Determine whether or not DECL
609 should have external or internal linkage at the object file
610 level. This routine does not deal with COMDAT linkage and other
611 similar complexities; it simply sets TREE_PUBLIC if it possible for
612 entities in other translation units to contain copies of DECL, in
616 set_linkage_according_to_type (tree type, tree decl)
618 /* If TYPE involves a local class in a function with internal
619 linkage, then DECL should have internal linkage too. Other local
620 classes have no linkage -- but if their containing functions
621 have external linkage, it makes sense for DECL to have external
622 linkage too. That will allow template definitions to be merged,
624 if (no_linkage_check (type, /*relaxed_p=*/true))
626 TREE_PUBLIC (decl) = 0;
627 DECL_INTERFACE_KNOWN (decl) = 1;
630 TREE_PUBLIC (decl) = 1;
633 /* Create a VAR_DECL for a primary or secondary vtable for CLASS_TYPE.
634 (For a secondary vtable for B-in-D, CLASS_TYPE should be D, not B.)
635 Use NAME for the name of the vtable, and VTABLE_TYPE for its type. */
638 build_vtable (tree class_type, tree name, tree vtable_type)
642 decl = build_lang_decl (VAR_DECL, name, vtable_type);
643 /* vtable names are already mangled; give them their DECL_ASSEMBLER_NAME
644 now to avoid confusion in mangle_decl. */
645 SET_DECL_ASSEMBLER_NAME (decl, name);
646 DECL_CONTEXT (decl) = class_type;
647 DECL_ARTIFICIAL (decl) = 1;
648 TREE_STATIC (decl) = 1;
649 TREE_READONLY (decl) = 1;
650 DECL_VIRTUAL_P (decl) = 1;
651 DECL_ALIGN (decl) = TARGET_VTABLE_ENTRY_ALIGN;
652 DECL_VTABLE_OR_VTT_P (decl) = 1;
653 /* At one time the vtable info was grabbed 2 words at a time. This
654 fails on sparc unless you have 8-byte alignment. (tiemann) */
655 DECL_ALIGN (decl) = MAX (TYPE_ALIGN (double_type_node),
657 set_linkage_according_to_type (class_type, decl);
658 /* The vtable has not been defined -- yet. */
659 DECL_EXTERNAL (decl) = 1;
660 DECL_NOT_REALLY_EXTERN (decl) = 1;
662 if (write_symbols == DWARF2_DEBUG)
663 /* Mark the VAR_DECL node representing the vtable itself as a
664 "gratuitous" one, thereby forcing dwarfout.c to ignore it. It
665 is rather important that such things be ignored because any
666 effort to actually generate DWARF for them will run into
667 trouble when/if we encounter code like:
670 struct S { virtual void member (); };
672 because the artificial declaration of the vtable itself (as
673 manufactured by the g++ front end) will say that the vtable is
674 a static member of `S' but only *after* the debug output for
675 the definition of `S' has already been output. This causes
676 grief because the DWARF entry for the definition of the vtable
677 will try to refer back to an earlier *declaration* of the
678 vtable as a static member of `S' and there won't be one. We
679 might be able to arrange to have the "vtable static member"
680 attached to the member list for `S' before the debug info for
681 `S' get written (which would solve the problem) but that would
682 require more intrusive changes to the g++ front end. */
683 DECL_IGNORED_P (decl) = 1;
688 /* Get the VAR_DECL of the vtable for TYPE. TYPE need not be polymorphic,
689 or even complete. If this does not exist, create it. If COMPLETE is
690 nonzero, then complete the definition of it -- that will render it
691 impossible to actually build the vtable, but is useful to get at those
692 which are known to exist in the runtime. */
695 get_vtable_decl (tree type, int complete)
699 if (CLASSTYPE_VTABLES (type))
700 return CLASSTYPE_VTABLES (type);
702 decl = build_vtable (type, get_vtable_name (type), vtbl_type_node);
703 CLASSTYPE_VTABLES (type) = decl;
707 DECL_EXTERNAL (decl) = 1;
708 cp_finish_decl (decl, NULL_TREE, NULL_TREE, 0);
714 /* Build the primary virtual function table for TYPE. If BINFO is
715 non-NULL, build the vtable starting with the initial approximation
716 that it is the same as the one which is the head of the association
717 list. Returns a nonzero value if a new vtable is actually
721 build_primary_vtable (tree binfo, tree type)
726 decl = get_vtable_decl (type, /*complete=*/0);
730 if (BINFO_NEW_VTABLE_MARKED (binfo))
731 /* We have already created a vtable for this base, so there's
732 no need to do it again. */
735 virtuals = copy_list (BINFO_VIRTUALS (binfo));
736 TREE_TYPE (decl) = TREE_TYPE (get_vtbl_decl_for_binfo (binfo));
737 DECL_SIZE (decl) = TYPE_SIZE (TREE_TYPE (decl));
738 DECL_SIZE_UNIT (decl) = TYPE_SIZE_UNIT (TREE_TYPE (decl));
742 gcc_assert (TREE_TYPE (decl) == vtbl_type_node);
743 virtuals = NULL_TREE;
746 #ifdef GATHER_STATISTICS
748 n_vtable_elems += list_length (virtuals);
751 /* Initialize the association list for this type, based
752 on our first approximation. */
753 BINFO_VTABLE (TYPE_BINFO (type)) = decl;
754 BINFO_VIRTUALS (TYPE_BINFO (type)) = virtuals;
755 SET_BINFO_NEW_VTABLE_MARKED (TYPE_BINFO (type));
759 /* Give BINFO a new virtual function table which is initialized
760 with a skeleton-copy of its original initialization. The only
761 entry that changes is the `delta' entry, so we can really
762 share a lot of structure.
764 FOR_TYPE is the most derived type which caused this table to
767 Returns nonzero if we haven't met BINFO before.
769 The order in which vtables are built (by calling this function) for
770 an object must remain the same, otherwise a binary incompatibility
774 build_secondary_vtable (tree binfo)
776 if (BINFO_NEW_VTABLE_MARKED (binfo))
777 /* We already created a vtable for this base. There's no need to
781 /* Remember that we've created a vtable for this BINFO, so that we
782 don't try to do so again. */
783 SET_BINFO_NEW_VTABLE_MARKED (binfo);
785 /* Make fresh virtual list, so we can smash it later. */
786 BINFO_VIRTUALS (binfo) = copy_list (BINFO_VIRTUALS (binfo));
788 /* Secondary vtables are laid out as part of the same structure as
789 the primary vtable. */
790 BINFO_VTABLE (binfo) = NULL_TREE;
794 /* Create a new vtable for BINFO which is the hierarchy dominated by
795 T. Return nonzero if we actually created a new vtable. */
798 make_new_vtable (tree t, tree binfo)
800 if (binfo == TYPE_BINFO (t))
801 /* In this case, it is *type*'s vtable we are modifying. We start
802 with the approximation that its vtable is that of the
803 immediate base class. */
804 return build_primary_vtable (binfo, t);
806 /* This is our very own copy of `basetype' to play with. Later,
807 we will fill in all the virtual functions that override the
808 virtual functions in these base classes which are not defined
809 by the current type. */
810 return build_secondary_vtable (binfo);
813 /* Make *VIRTUALS, an entry on the BINFO_VIRTUALS list for BINFO
814 (which is in the hierarchy dominated by T) list FNDECL as its
815 BV_FN. DELTA is the required constant adjustment from the `this'
816 pointer where the vtable entry appears to the `this' required when
817 the function is actually called. */
820 modify_vtable_entry (tree t,
830 if (fndecl != BV_FN (v)
831 || !tree_int_cst_equal (delta, BV_DELTA (v)))
833 /* We need a new vtable for BINFO. */
834 if (make_new_vtable (t, binfo))
836 /* If we really did make a new vtable, we also made a copy
837 of the BINFO_VIRTUALS list. Now, we have to find the
838 corresponding entry in that list. */
839 *virtuals = BINFO_VIRTUALS (binfo);
840 while (BV_FN (*virtuals) != BV_FN (v))
841 *virtuals = TREE_CHAIN (*virtuals);
845 BV_DELTA (v) = delta;
846 BV_VCALL_INDEX (v) = NULL_TREE;
852 /* Add method METHOD to class TYPE. */
855 add_method (tree type, tree method)
861 VEC(tree) *method_vec;
863 bool insert_p = false;
866 if (method == error_mark_node)
869 complete_p = COMPLETE_TYPE_P (type);
870 using = (DECL_CONTEXT (method) != type);
871 template_conv_p = (TREE_CODE (method) == TEMPLATE_DECL
872 && DECL_TEMPLATE_CONV_FN_P (method));
874 method_vec = CLASSTYPE_METHOD_VEC (type);
877 /* Make a new method vector. We start with 8 entries. We must
878 allocate at least two (for constructors and destructors), and
879 we're going to end up with an assignment operator at some
881 method_vec = VEC_alloc (tree, 8);
882 /* Create slots for constructors and destructors. */
883 VEC_quick_push (tree, method_vec, NULL_TREE);
884 VEC_quick_push (tree, method_vec, NULL_TREE);
885 CLASSTYPE_METHOD_VEC (type) = method_vec;
888 /* Constructors and destructors go in special slots. */
889 if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (method))
890 slot = CLASSTYPE_CONSTRUCTOR_SLOT;
891 else if (DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P (method))
893 slot = CLASSTYPE_DESTRUCTOR_SLOT;
894 TYPE_HAS_DESTRUCTOR (type) = 1;
896 if (TYPE_FOR_JAVA (type))
897 error (DECL_ARTIFICIAL (method)
898 ? "Java class %qT cannot have an implicit non-trivial destructor"
899 : "Java class %qT cannot have a destructor",
900 DECL_CONTEXT (method));
904 bool conv_p = DECL_CONV_FN_P (method);
908 /* See if we already have an entry with this name. */
909 for (slot = CLASSTYPE_FIRST_CONVERSION_SLOT;
910 VEC_iterate (tree, method_vec, slot, m);
916 if (TREE_CODE (m) == TEMPLATE_DECL
917 && DECL_TEMPLATE_CONV_FN_P (m))
921 if (conv_p && !DECL_CONV_FN_P (m))
923 if (DECL_NAME (m) == DECL_NAME (method))
929 && !DECL_CONV_FN_P (m)
930 && DECL_NAME (m) > DECL_NAME (method))
934 current_fns = insert_p ? NULL_TREE : VEC_index (tree, method_vec, slot);
936 if (processing_template_decl)
937 /* TYPE is a template class. Don't issue any errors now; wait
938 until instantiation time to complain. */
944 /* Check to see if we've already got this method. */
945 for (fns = current_fns; fns; fns = OVL_NEXT (fns))
947 tree fn = OVL_CURRENT (fns);
952 if (TREE_CODE (fn) != TREE_CODE (method))
955 /* [over.load] Member function declarations with the
956 same name and the same parameter types cannot be
957 overloaded if any of them is a static member
958 function declaration.
960 [namespace.udecl] When a using-declaration brings names
961 from a base class into a derived class scope, member
962 functions in the derived class override and/or hide member
963 functions with the same name and parameter types in a base
964 class (rather than conflicting). */
965 parms1 = TYPE_ARG_TYPES (TREE_TYPE (fn));
966 parms2 = TYPE_ARG_TYPES (TREE_TYPE (method));
968 /* Compare the quals on the 'this' parm. Don't compare
969 the whole types, as used functions are treated as
970 coming from the using class in overload resolution. */
971 if (! DECL_STATIC_FUNCTION_P (fn)
972 && ! DECL_STATIC_FUNCTION_P (method)
973 && (TYPE_QUALS (TREE_TYPE (TREE_VALUE (parms1)))
974 != TYPE_QUALS (TREE_TYPE (TREE_VALUE (parms2)))))
977 /* For templates, the template parms must be identical. */
978 if (TREE_CODE (fn) == TEMPLATE_DECL
979 && !comp_template_parms (DECL_TEMPLATE_PARMS (fn),
980 DECL_TEMPLATE_PARMS (method)))
983 if (! DECL_STATIC_FUNCTION_P (fn))
984 parms1 = TREE_CHAIN (parms1);
985 if (! DECL_STATIC_FUNCTION_P (method))
986 parms2 = TREE_CHAIN (parms2);
988 if (same && compparms (parms1, parms2)
989 && (!DECL_CONV_FN_P (fn)
990 || same_type_p (TREE_TYPE (TREE_TYPE (fn)),
991 TREE_TYPE (TREE_TYPE (method)))))
993 if (using && DECL_CONTEXT (fn) == type)
994 /* Defer to the local function. */
998 cp_error_at ("%q#D and %q#D cannot be overloaded",
1001 /* We don't call duplicate_decls here to merge
1002 the declarations because that will confuse
1003 things if the methods have inline
1004 definitions. In particular, we will crash
1005 while processing the definitions. */
1012 /* Add the new binding. */
1013 overload = build_overload (method, current_fns);
1015 if (slot >= CLASSTYPE_FIRST_CONVERSION_SLOT && !complete_p)
1016 push_class_level_binding (DECL_NAME (method), overload);
1020 /* We only expect to add few methods in the COMPLETE_P case, so
1021 just make room for one more method in that case. */
1022 if (VEC_reserve (tree, method_vec, complete_p ? 1 : -1))
1023 CLASSTYPE_METHOD_VEC (type) = method_vec;
1024 if (slot == VEC_length (tree, method_vec))
1025 VEC_quick_push (tree, method_vec, overload);
1027 VEC_quick_insert (tree, method_vec, slot, overload);
1030 /* Replace the current slot. */
1031 VEC_replace (tree, method_vec, slot, overload);
1034 /* Subroutines of finish_struct. */
1036 /* Change the access of FDECL to ACCESS in T. Return 1 if change was
1037 legit, otherwise return 0. */
1040 alter_access (tree t, tree fdecl, tree access)
1044 if (!DECL_LANG_SPECIFIC (fdecl))
1045 retrofit_lang_decl (fdecl);
1047 gcc_assert (!DECL_DISCRIMINATOR_P (fdecl));
1049 elem = purpose_member (t, DECL_ACCESS (fdecl));
1052 if (TREE_VALUE (elem) != access)
1054 if (TREE_CODE (TREE_TYPE (fdecl)) == FUNCTION_DECL)
1055 cp_error_at ("conflicting access specifications for method"
1056 " %qD, ignored", TREE_TYPE (fdecl));
1058 error ("conflicting access specifications for field %qE, ignored",
1063 /* They're changing the access to the same thing they changed
1064 it to before. That's OK. */
1070 perform_or_defer_access_check (TYPE_BINFO (t), fdecl);
1071 DECL_ACCESS (fdecl) = tree_cons (t, access, DECL_ACCESS (fdecl));
1077 /* Process the USING_DECL, which is a member of T. */
1080 handle_using_decl (tree using_decl, tree t)
1082 tree ctype = DECL_INITIAL (using_decl);
1083 tree name = DECL_NAME (using_decl);
1085 = TREE_PRIVATE (using_decl) ? access_private_node
1086 : TREE_PROTECTED (using_decl) ? access_protected_node
1087 : access_public_node;
1089 tree flist = NULL_TREE;
1092 if (ctype == error_mark_node)
1095 binfo = lookup_base (t, ctype, ba_any, NULL);
1098 location_t saved_loc = input_location;
1100 input_location = DECL_SOURCE_LOCATION (using_decl);
1101 error_not_base_type (ctype, t);
1102 input_location = saved_loc;
1106 if (constructor_name_p (name, ctype))
1108 cp_error_at ("%qD names constructor", using_decl);
1111 if (constructor_name_p (name, t))
1113 cp_error_at ("%qD invalid in %qT", using_decl, t);
1117 fdecl = lookup_member (binfo, name, 0, false);
1121 cp_error_at ("no members matching %qD in %q#T", using_decl, ctype);
1125 if (BASELINK_P (fdecl))
1126 /* Ignore base type this came from. */
1127 fdecl = BASELINK_FUNCTIONS (fdecl);
1129 old_value = lookup_member (t, name, /*protect=*/0, /*want_type=*/false);
1132 if (is_overloaded_fn (old_value))
1133 old_value = OVL_CURRENT (old_value);
1135 if (DECL_P (old_value) && DECL_CONTEXT (old_value) == t)
1138 old_value = NULL_TREE;
1141 if (is_overloaded_fn (fdecl))
1146 else if (is_overloaded_fn (old_value))
1149 /* It's OK to use functions from a base when there are functions with
1150 the same name already present in the current class. */;
1153 cp_error_at ("%qD invalid in %q#T", using_decl, t);
1154 cp_error_at (" because of local method %q#D with same name",
1155 OVL_CURRENT (old_value));
1159 else if (!DECL_ARTIFICIAL (old_value))
1161 cp_error_at ("%qD invalid in %q#T", using_decl, t);
1162 cp_error_at (" because of local member %q#D with same name", old_value);
1166 /* Make type T see field decl FDECL with access ACCESS. */
1168 for (; flist; flist = OVL_NEXT (flist))
1170 add_method (t, OVL_CURRENT (flist));
1171 alter_access (t, OVL_CURRENT (flist), access);
1174 alter_access (t, fdecl, access);
1177 /* Run through the base classes of T, updating
1178 CANT_HAVE_DEFAULT_CTOR_P, CANT_HAVE_CONST_CTOR_P, and
1179 NO_CONST_ASN_REF_P. Also set flag bits in T based on properties of
1183 check_bases (tree t,
1184 int* cant_have_default_ctor_p,
1185 int* cant_have_const_ctor_p,
1186 int* no_const_asn_ref_p)
1189 int seen_non_virtual_nearly_empty_base_p;
1193 seen_non_virtual_nearly_empty_base_p = 0;
1195 for (binfo = TYPE_BINFO (t), i = 0;
1196 BINFO_BASE_ITERATE (binfo, i, base_binfo); i++)
1198 tree basetype = TREE_TYPE (base_binfo);
1200 gcc_assert (COMPLETE_TYPE_P (basetype));
1202 /* Effective C++ rule 14. We only need to check TYPE_POLYMORPHIC_P
1203 here because the case of virtual functions but non-virtual
1204 dtor is handled in finish_struct_1. */
1205 if (warn_ecpp && ! TYPE_POLYMORPHIC_P (basetype)
1206 && TYPE_HAS_DESTRUCTOR (basetype))
1207 warning ("base class %q#T has a non-virtual destructor", basetype);
1209 /* If the base class doesn't have copy constructors or
1210 assignment operators that take const references, then the
1211 derived class cannot have such a member automatically
1213 if (! TYPE_HAS_CONST_INIT_REF (basetype))
1214 *cant_have_const_ctor_p = 1;
1215 if (TYPE_HAS_ASSIGN_REF (basetype)
1216 && !TYPE_HAS_CONST_ASSIGN_REF (basetype))
1217 *no_const_asn_ref_p = 1;
1218 /* Similarly, if the base class doesn't have a default
1219 constructor, then the derived class won't have an
1220 automatically generated default constructor. */
1221 if (TYPE_HAS_CONSTRUCTOR (basetype)
1222 && ! TYPE_HAS_DEFAULT_CONSTRUCTOR (basetype))
1224 *cant_have_default_ctor_p = 1;
1225 if (! TYPE_HAS_CONSTRUCTOR (t))
1226 pedwarn ("base %qT with only non-default constructor in class "
1227 "without a constructor",
1231 if (BINFO_VIRTUAL_P (base_binfo))
1232 /* A virtual base does not effect nearly emptiness. */
1234 else if (CLASSTYPE_NEARLY_EMPTY_P (basetype))
1236 if (seen_non_virtual_nearly_empty_base_p)
1237 /* And if there is more than one nearly empty base, then the
1238 derived class is not nearly empty either. */
1239 CLASSTYPE_NEARLY_EMPTY_P (t) = 0;
1241 /* Remember we've seen one. */
1242 seen_non_virtual_nearly_empty_base_p = 1;
1244 else if (!is_empty_class (basetype))
1245 /* If the base class is not empty or nearly empty, then this
1246 class cannot be nearly empty. */
1247 CLASSTYPE_NEARLY_EMPTY_P (t) = 0;
1249 /* A lot of properties from the bases also apply to the derived
1251 TYPE_NEEDS_CONSTRUCTING (t) |= TYPE_NEEDS_CONSTRUCTING (basetype);
1252 TYPE_HAS_NONTRIVIAL_DESTRUCTOR (t)
1253 |= TYPE_HAS_NONTRIVIAL_DESTRUCTOR (basetype);
1254 TYPE_HAS_COMPLEX_ASSIGN_REF (t)
1255 |= TYPE_HAS_COMPLEX_ASSIGN_REF (basetype);
1256 TYPE_HAS_COMPLEX_INIT_REF (t) |= TYPE_HAS_COMPLEX_INIT_REF (basetype);
1257 TYPE_POLYMORPHIC_P (t) |= TYPE_POLYMORPHIC_P (basetype);
1258 CLASSTYPE_CONTAINS_EMPTY_CLASS_P (t)
1259 |= CLASSTYPE_CONTAINS_EMPTY_CLASS_P (basetype);
1263 /* Determine all the primary bases within T. Sets BINFO_PRIMARY_BASE_P for
1264 those that are primaries. Sets BINFO_LOST_PRIMARY_P for those
1265 that have had a nearly-empty virtual primary base stolen by some
1266 other base in the hierarchy. Determines CLASSTYPE_PRIMARY_BASE for
1270 determine_primary_bases (tree t)
1273 tree primary = NULL_TREE;
1274 tree type_binfo = TYPE_BINFO (t);
1277 /* Determine the primary bases of our bases. */
1278 for (base_binfo = TREE_CHAIN (type_binfo); base_binfo;
1279 base_binfo = TREE_CHAIN (base_binfo))
1281 tree primary = CLASSTYPE_PRIMARY_BINFO (BINFO_TYPE (base_binfo));
1283 /* See if we're the non-virtual primary of our inheritance
1285 if (!BINFO_VIRTUAL_P (base_binfo))
1287 tree parent = BINFO_INHERITANCE_CHAIN (base_binfo);
1288 tree parent_primary = CLASSTYPE_PRIMARY_BINFO (BINFO_TYPE (parent));
1291 && SAME_BINFO_TYPE_P (BINFO_TYPE (base_binfo),
1292 BINFO_TYPE (parent_primary)))
1293 /* We are the primary binfo. */
1294 BINFO_PRIMARY_P (base_binfo) = 1;
1296 /* Determine if we have a virtual primary base, and mark it so.
1298 if (primary && BINFO_VIRTUAL_P (primary))
1300 tree this_primary = copied_binfo (primary, base_binfo);
1302 if (BINFO_PRIMARY_P (this_primary))
1303 /* Someone already claimed this base. */
1304 BINFO_LOST_PRIMARY_P (base_binfo) = 1;
1309 BINFO_PRIMARY_P (this_primary) = 1;
1310 BINFO_INHERITANCE_CHAIN (this_primary) = base_binfo;
1312 /* A virtual binfo might have been copied from within
1313 another hierarchy. As we're about to use it as a
1314 primary base, make sure the offsets match. */
1315 delta = size_diffop (convert (ssizetype,
1316 BINFO_OFFSET (base_binfo)),
1318 BINFO_OFFSET (this_primary)));
1320 propagate_binfo_offsets (this_primary, delta);
1325 /* First look for a dynamic direct non-virtual base. */
1326 for (i = 0; BINFO_BASE_ITERATE (type_binfo, i, base_binfo); i++)
1328 tree basetype = BINFO_TYPE (base_binfo);
1330 if (TYPE_CONTAINS_VPTR_P (basetype) && !BINFO_VIRTUAL_P (base_binfo))
1332 primary = base_binfo;
1337 /* A "nearly-empty" virtual base class can be the primary base
1338 class, if no non-virtual polymorphic base can be found. Look for
1339 a nearly-empty virtual dynamic base that is not already a primary
1340 base of something in the hierarchy. If there is no such base,
1341 just pick the first nearly-empty virtual base. */
1343 for (base_binfo = TREE_CHAIN (type_binfo); base_binfo;
1344 base_binfo = TREE_CHAIN (base_binfo))
1345 if (BINFO_VIRTUAL_P (base_binfo)
1346 && CLASSTYPE_NEARLY_EMPTY_P (BINFO_TYPE (base_binfo)))
1348 if (!BINFO_PRIMARY_P (base_binfo))
1350 /* Found one that is not primary. */
1351 primary = base_binfo;
1355 /* Remember the first candidate. */
1356 primary = base_binfo;
1360 /* If we've got a primary base, use it. */
1363 tree basetype = BINFO_TYPE (primary);
1365 CLASSTYPE_PRIMARY_BINFO (t) = primary;
1366 if (BINFO_PRIMARY_P (primary))
1367 /* We are stealing a primary base. */
1368 BINFO_LOST_PRIMARY_P (BINFO_INHERITANCE_CHAIN (primary)) = 1;
1369 BINFO_PRIMARY_P (primary) = 1;
1370 if (BINFO_VIRTUAL_P (primary))
1374 BINFO_INHERITANCE_CHAIN (primary) = type_binfo;
1375 /* A virtual binfo might have been copied from within
1376 another hierarchy. As we're about to use it as a primary
1377 base, make sure the offsets match. */
1378 delta = size_diffop (ssize_int (0),
1379 convert (ssizetype, BINFO_OFFSET (primary)));
1381 propagate_binfo_offsets (primary, delta);
1384 primary = TYPE_BINFO (basetype);
1386 TYPE_VFIELD (t) = TYPE_VFIELD (basetype);
1387 BINFO_VTABLE (type_binfo) = BINFO_VTABLE (primary);
1388 BINFO_VIRTUALS (type_binfo) = BINFO_VIRTUALS (primary);
1392 /* Set memoizing fields and bits of T (and its variants) for later
1396 finish_struct_bits (tree t)
1400 /* Fix up variants (if any). */
1401 for (variants = TYPE_NEXT_VARIANT (t);
1403 variants = TYPE_NEXT_VARIANT (variants))
1405 /* These fields are in the _TYPE part of the node, not in
1406 the TYPE_LANG_SPECIFIC component, so they are not shared. */
1407 TYPE_HAS_CONSTRUCTOR (variants) = TYPE_HAS_CONSTRUCTOR (t);
1408 TYPE_HAS_DESTRUCTOR (variants) = TYPE_HAS_DESTRUCTOR (t);
1409 TYPE_NEEDS_CONSTRUCTING (variants) = TYPE_NEEDS_CONSTRUCTING (t);
1410 TYPE_HAS_NONTRIVIAL_DESTRUCTOR (variants)
1411 = TYPE_HAS_NONTRIVIAL_DESTRUCTOR (t);
1413 TYPE_POLYMORPHIC_P (variants) = TYPE_POLYMORPHIC_P (t);
1415 TYPE_BINFO (variants) = TYPE_BINFO (t);
1417 /* Copy whatever these are holding today. */
1418 TYPE_VFIELD (variants) = TYPE_VFIELD (t);
1419 TYPE_METHODS (variants) = TYPE_METHODS (t);
1420 TYPE_FIELDS (variants) = TYPE_FIELDS (t);
1421 TYPE_SIZE (variants) = TYPE_SIZE (t);
1422 TYPE_SIZE_UNIT (variants) = TYPE_SIZE_UNIT (t);
1425 if (BINFO_N_BASE_BINFOS (TYPE_BINFO (t)) && TYPE_POLYMORPHIC_P (t))
1426 /* For a class w/o baseclasses, 'finish_struct' has set
1427 CLASSTYPE_PURE_VIRTUALS correctly (by definition).
1428 Similarly for a class whose base classes do not have vtables.
1429 When neither of these is true, we might have removed abstract
1430 virtuals (by providing a definition), added some (by declaring
1431 new ones), or redeclared ones from a base class. We need to
1432 recalculate what's really an abstract virtual at this point (by
1433 looking in the vtables). */
1434 get_pure_virtuals (t);
1436 /* If this type has a copy constructor or a destructor, force its
1437 mode to be BLKmode, and force its TREE_ADDRESSABLE bit to be
1438 nonzero. This will cause it to be passed by invisible reference
1439 and prevent it from being returned in a register. */
1440 if (! TYPE_HAS_TRIVIAL_INIT_REF (t) || TYPE_HAS_NONTRIVIAL_DESTRUCTOR (t))
1443 DECL_MODE (TYPE_MAIN_DECL (t)) = BLKmode;
1444 for (variants = t; variants; variants = TYPE_NEXT_VARIANT (variants))
1446 TYPE_MODE (variants) = BLKmode;
1447 TREE_ADDRESSABLE (variants) = 1;
1452 /* Issue warnings about T having private constructors, but no friends,
1455 HAS_NONPRIVATE_METHOD is nonzero if T has any non-private methods or
1456 static members. HAS_NONPRIVATE_STATIC_FN is nonzero if T has any
1457 non-private static member functions. */
1460 maybe_warn_about_overly_private_class (tree t)
1462 int has_member_fn = 0;
1463 int has_nonprivate_method = 0;
1466 if (!warn_ctor_dtor_privacy
1467 /* If the class has friends, those entities might create and
1468 access instances, so we should not warn. */
1469 || (CLASSTYPE_FRIEND_CLASSES (t)
1470 || DECL_FRIENDLIST (TYPE_MAIN_DECL (t)))
1471 /* We will have warned when the template was declared; there's
1472 no need to warn on every instantiation. */
1473 || CLASSTYPE_TEMPLATE_INSTANTIATION (t))
1474 /* There's no reason to even consider warning about this
1478 /* We only issue one warning, if more than one applies, because
1479 otherwise, on code like:
1482 // Oops - forgot `public:'
1488 we warn several times about essentially the same problem. */
1490 /* Check to see if all (non-constructor, non-destructor) member
1491 functions are private. (Since there are no friends or
1492 non-private statics, we can't ever call any of the private member
1494 for (fn = TYPE_METHODS (t); fn; fn = TREE_CHAIN (fn))
1495 /* We're not interested in compiler-generated methods; they don't
1496 provide any way to call private members. */
1497 if (!DECL_ARTIFICIAL (fn))
1499 if (!TREE_PRIVATE (fn))
1501 if (DECL_STATIC_FUNCTION_P (fn))
1502 /* A non-private static member function is just like a
1503 friend; it can create and invoke private member
1504 functions, and be accessed without a class
1508 has_nonprivate_method = 1;
1509 /* Keep searching for a static member function. */
1511 else if (!DECL_CONSTRUCTOR_P (fn) && !DECL_DESTRUCTOR_P (fn))
1515 if (!has_nonprivate_method && has_member_fn)
1517 /* There are no non-private methods, and there's at least one
1518 private member function that isn't a constructor or
1519 destructor. (If all the private members are
1520 constructors/destructors we want to use the code below that
1521 issues error messages specifically referring to
1522 constructors/destructors.) */
1524 tree binfo = TYPE_BINFO (t);
1526 for (i = 0; i != BINFO_N_BASE_BINFOS (binfo); i++)
1527 if (BINFO_BASE_ACCESS (binfo, i) != access_private_node)
1529 has_nonprivate_method = 1;
1532 if (!has_nonprivate_method)
1534 warning ("all member functions in class %qT are private", t);
1539 /* Even if some of the member functions are non-private, the class
1540 won't be useful for much if all the constructors or destructors
1541 are private: such an object can never be created or destroyed. */
1542 if (TYPE_HAS_DESTRUCTOR (t)
1543 && TREE_PRIVATE (CLASSTYPE_DESTRUCTORS (t)))
1545 warning ("%q#T only defines a private destructor and has no friends",
1550 if (TYPE_HAS_CONSTRUCTOR (t))
1552 int nonprivate_ctor = 0;
1554 /* If a non-template class does not define a copy
1555 constructor, one is defined for it, enabling it to avoid
1556 this warning. For a template class, this does not
1557 happen, and so we would normally get a warning on:
1559 template <class T> class C { private: C(); };
1561 To avoid this asymmetry, we check TYPE_HAS_INIT_REF. All
1562 complete non-template or fully instantiated classes have this
1564 if (!TYPE_HAS_INIT_REF (t))
1565 nonprivate_ctor = 1;
1567 for (fn = CLASSTYPE_CONSTRUCTORS (t); fn; fn = OVL_NEXT (fn))
1569 tree ctor = OVL_CURRENT (fn);
1570 /* Ideally, we wouldn't count copy constructors (or, in
1571 fact, any constructor that takes an argument of the
1572 class type as a parameter) because such things cannot
1573 be used to construct an instance of the class unless
1574 you already have one. But, for now at least, we're
1576 if (! TREE_PRIVATE (ctor))
1578 nonprivate_ctor = 1;
1583 if (nonprivate_ctor == 0)
1585 warning ("%q#T only defines private constructors and has no friends",
1593 gt_pointer_operator new_value;
1597 /* Comparison function to compare two TYPE_METHOD_VEC entries by name. */
1600 method_name_cmp (const void* m1_p, const void* m2_p)
1602 const tree *const m1 = m1_p;
1603 const tree *const m2 = m2_p;
1605 if (*m1 == NULL_TREE && *m2 == NULL_TREE)
1607 if (*m1 == NULL_TREE)
1609 if (*m2 == NULL_TREE)
1611 if (DECL_NAME (OVL_CURRENT (*m1)) < DECL_NAME (OVL_CURRENT (*m2)))
1616 /* This routine compares two fields like method_name_cmp but using the
1617 pointer operator in resort_field_decl_data. */
1620 resort_method_name_cmp (const void* m1_p, const void* m2_p)
1622 const tree *const m1 = m1_p;
1623 const tree *const m2 = m2_p;
1624 if (*m1 == NULL_TREE && *m2 == NULL_TREE)
1626 if (*m1 == NULL_TREE)
1628 if (*m2 == NULL_TREE)
1631 tree d1 = DECL_NAME (OVL_CURRENT (*m1));
1632 tree d2 = DECL_NAME (OVL_CURRENT (*m2));
1633 resort_data.new_value (&d1, resort_data.cookie);
1634 resort_data.new_value (&d2, resort_data.cookie);
1641 /* Resort TYPE_METHOD_VEC because pointers have been reordered. */
1644 resort_type_method_vec (void* obj,
1645 void* orig_obj ATTRIBUTE_UNUSED ,
1646 gt_pointer_operator new_value,
1649 VEC(tree) *method_vec = (VEC(tree) *) obj;
1650 int len = VEC_length (tree, method_vec);
1654 /* The type conversion ops have to live at the front of the vec, so we
1656 for (slot = CLASSTYPE_FIRST_CONVERSION_SLOT;
1657 VEC_iterate (tree, method_vec, slot, fn);
1659 if (!DECL_CONV_FN_P (OVL_CURRENT (fn)))
1664 resort_data.new_value = new_value;
1665 resort_data.cookie = cookie;
1666 qsort (VEC_address (tree, method_vec) + slot, len - slot, sizeof (tree),
1667 resort_method_name_cmp);
1671 /* Warn about duplicate methods in fn_fields.
1673 Sort methods that are not special (i.e., constructors, destructors,
1674 and type conversion operators) so that we can find them faster in
1678 finish_struct_methods (tree t)
1681 VEC(tree) *method_vec;
1684 method_vec = CLASSTYPE_METHOD_VEC (t);
1688 len = VEC_length (tree, method_vec);
1690 /* Clear DECL_IN_AGGR_P for all functions. */
1691 for (fn_fields = TYPE_METHODS (t); fn_fields;
1692 fn_fields = TREE_CHAIN (fn_fields))
1693 DECL_IN_AGGR_P (fn_fields) = 0;
1695 if (TYPE_HAS_DESTRUCTOR (t) && !CLASSTYPE_DESTRUCTORS (t))
1696 /* We thought there was a destructor, but there wasn't. Some
1697 parse errors cause this anomalous situation. */
1698 TYPE_HAS_DESTRUCTOR (t) = 0;
1700 /* Issue warnings about private constructors and such. If there are
1701 no methods, then some public defaults are generated. */
1702 maybe_warn_about_overly_private_class (t);
1704 /* The type conversion ops have to live at the front of the vec, so we
1706 for (slot = CLASSTYPE_FIRST_CONVERSION_SLOT;
1707 VEC_iterate (tree, method_vec, slot, fn_fields);
1709 if (!DECL_CONV_FN_P (OVL_CURRENT (fn_fields)))
1712 qsort (VEC_address (tree, method_vec) + slot,
1713 len-slot, sizeof (tree), method_name_cmp);
1716 /* Make BINFO's vtable have N entries, including RTTI entries,
1717 vbase and vcall offsets, etc. Set its type and call the backend
1721 layout_vtable_decl (tree binfo, int n)
1726 atype = build_cplus_array_type (vtable_entry_type,
1727 build_index_type (size_int (n - 1)));
1728 layout_type (atype);
1730 /* We may have to grow the vtable. */
1731 vtable = get_vtbl_decl_for_binfo (binfo);
1732 if (!same_type_p (TREE_TYPE (vtable), atype))
1734 TREE_TYPE (vtable) = atype;
1735 DECL_SIZE (vtable) = DECL_SIZE_UNIT (vtable) = NULL_TREE;
1736 layout_decl (vtable, 0);
1740 /* True iff FNDECL and BASE_FNDECL (both non-static member functions)
1741 have the same signature. */
1744 same_signature_p (tree fndecl, tree base_fndecl)
1746 /* One destructor overrides another if they are the same kind of
1748 if (DECL_DESTRUCTOR_P (base_fndecl) && DECL_DESTRUCTOR_P (fndecl)
1749 && special_function_p (base_fndecl) == special_function_p (fndecl))
1751 /* But a non-destructor never overrides a destructor, nor vice
1752 versa, nor do different kinds of destructors override
1753 one-another. For example, a complete object destructor does not
1754 override a deleting destructor. */
1755 if (DECL_DESTRUCTOR_P (base_fndecl) || DECL_DESTRUCTOR_P (fndecl))
1758 if (DECL_NAME (fndecl) == DECL_NAME (base_fndecl)
1759 || (DECL_CONV_FN_P (fndecl)
1760 && DECL_CONV_FN_P (base_fndecl)
1761 && same_type_p (DECL_CONV_FN_TYPE (fndecl),
1762 DECL_CONV_FN_TYPE (base_fndecl))))
1764 tree types, base_types;
1765 types = TYPE_ARG_TYPES (TREE_TYPE (fndecl));
1766 base_types = TYPE_ARG_TYPES (TREE_TYPE (base_fndecl));
1767 if ((TYPE_QUALS (TREE_TYPE (TREE_VALUE (base_types)))
1768 == TYPE_QUALS (TREE_TYPE (TREE_VALUE (types))))
1769 && compparms (TREE_CHAIN (base_types), TREE_CHAIN (types)))
1775 /* Returns TRUE if DERIVED is a binfo containing the binfo BASE as a
1779 base_derived_from (tree derived, tree base)
1783 for (probe = base; probe; probe = BINFO_INHERITANCE_CHAIN (probe))
1785 if (probe == derived)
1787 else if (BINFO_VIRTUAL_P (probe))
1788 /* If we meet a virtual base, we can't follow the inheritance
1789 any more. See if the complete type of DERIVED contains
1790 such a virtual base. */
1791 return (binfo_for_vbase (BINFO_TYPE (probe), BINFO_TYPE (derived))
1797 typedef struct find_final_overrider_data_s {
1798 /* The function for which we are trying to find a final overrider. */
1800 /* The base class in which the function was declared. */
1801 tree declaring_base;
1802 /* The candidate overriders. */
1804 /* Path to most derived. */
1806 } find_final_overrider_data;
1808 /* Add the overrider along the current path to FFOD->CANDIDATES.
1809 Returns true if an overrider was found; false otherwise. */
1812 dfs_find_final_overrider_1 (tree binfo,
1813 find_final_overrider_data *ffod,
1818 /* If BINFO is not the most derived type, try a more derived class.
1819 A definition there will overrider a definition here. */
1823 if (dfs_find_final_overrider_1
1824 (VEC_index (tree, ffod->path, depth), ffod, depth))
1828 method = look_for_overrides_here (BINFO_TYPE (binfo), ffod->fn);
1831 tree *candidate = &ffod->candidates;
1833 /* Remove any candidates overridden by this new function. */
1836 /* If *CANDIDATE overrides METHOD, then METHOD
1837 cannot override anything else on the list. */
1838 if (base_derived_from (TREE_VALUE (*candidate), binfo))
1840 /* If METHOD overrides *CANDIDATE, remove *CANDIDATE. */
1841 if (base_derived_from (binfo, TREE_VALUE (*candidate)))
1842 *candidate = TREE_CHAIN (*candidate);
1844 candidate = &TREE_CHAIN (*candidate);
1847 /* Add the new function. */
1848 ffod->candidates = tree_cons (method, binfo, ffod->candidates);
1855 /* Called from find_final_overrider via dfs_walk. */
1858 dfs_find_final_overrider_pre (tree binfo, void *data)
1860 find_final_overrider_data *ffod = (find_final_overrider_data *) data;
1862 if (binfo == ffod->declaring_base)
1863 dfs_find_final_overrider_1 (binfo, ffod, VEC_length (tree, ffod->path));
1864 VEC_safe_push (tree, ffod->path, binfo);
1870 dfs_find_final_overrider_post (tree binfo ATTRIBUTE_UNUSED, void *data)
1872 find_final_overrider_data *ffod = (find_final_overrider_data *) data;
1873 VEC_pop (tree, ffod->path);
1878 /* Returns a TREE_LIST whose TREE_PURPOSE is the final overrider for
1879 FN and whose TREE_VALUE is the binfo for the base where the
1880 overriding occurs. BINFO (in the hierarchy dominated by the binfo
1881 DERIVED) is the base object in which FN is declared. */
1884 find_final_overrider (tree derived, tree binfo, tree fn)
1886 find_final_overrider_data ffod;
1888 /* Getting this right is a little tricky. This is valid:
1890 struct S { virtual void f (); };
1891 struct T { virtual void f (); };
1892 struct U : public S, public T { };
1894 even though calling `f' in `U' is ambiguous. But,
1896 struct R { virtual void f(); };
1897 struct S : virtual public R { virtual void f (); };
1898 struct T : virtual public R { virtual void f (); };
1899 struct U : public S, public T { };
1901 is not -- there's no way to decide whether to put `S::f' or
1902 `T::f' in the vtable for `R'.
1904 The solution is to look at all paths to BINFO. If we find
1905 different overriders along any two, then there is a problem. */
1906 if (DECL_THUNK_P (fn))
1907 fn = THUNK_TARGET (fn);
1909 /* Determine the depth of the hierarchy. */
1911 ffod.declaring_base = binfo;
1912 ffod.candidates = NULL_TREE;
1913 ffod.path = VEC_alloc (tree, 30);
1915 dfs_walk_all (derived, dfs_find_final_overrider_pre,
1916 dfs_find_final_overrider_post, &ffod);
1918 VEC_free (tree, ffod.path);
1920 /* If there was no winner, issue an error message. */
1921 if (!ffod.candidates || TREE_CHAIN (ffod.candidates))
1923 error ("no unique final overrider for %qD in %qT", fn,
1924 BINFO_TYPE (derived));
1925 return error_mark_node;
1928 return ffod.candidates;
1931 /* Return the index of the vcall offset for FN when TYPE is used as a
1935 get_vcall_index (tree fn, tree type)
1937 VEC (tree_pair_s) *indices = CLASSTYPE_VCALL_INDICES (type);
1941 for (ix = 0; VEC_iterate (tree_pair_s, indices, ix, p); ix++)
1942 if ((DECL_DESTRUCTOR_P (fn) && DECL_DESTRUCTOR_P (p->purpose))
1943 || same_signature_p (fn, p->purpose))
1946 /* There should always be an appropriate index. */
1950 /* Update an entry in the vtable for BINFO, which is in the hierarchy
1951 dominated by T. FN has been overridden in BINFO; VIRTUALS points to the
1952 corresponding position in the BINFO_VIRTUALS list. */
1955 update_vtable_entry_for_fn (tree t, tree binfo, tree fn, tree* virtuals,
1963 tree overrider_fn, overrider_target;
1964 tree target_fn = DECL_THUNK_P (fn) ? THUNK_TARGET (fn) : fn;
1965 tree over_return, base_return;
1968 /* Find the nearest primary base (possibly binfo itself) which defines
1969 this function; this is the class the caller will convert to when
1970 calling FN through BINFO. */
1971 for (b = binfo; ; b = get_primary_binfo (b))
1974 if (look_for_overrides_here (BINFO_TYPE (b), target_fn))
1977 /* The nearest definition is from a lost primary. */
1978 if (BINFO_LOST_PRIMARY_P (b))
1983 /* Find the final overrider. */
1984 overrider = find_final_overrider (TYPE_BINFO (t), b, target_fn);
1985 if (overrider == error_mark_node)
1987 overrider_target = overrider_fn = TREE_PURPOSE (overrider);
1989 /* Check for adjusting covariant return types. */
1990 over_return = TREE_TYPE (TREE_TYPE (overrider_target));
1991 base_return = TREE_TYPE (TREE_TYPE (target_fn));
1993 if (POINTER_TYPE_P (over_return)
1994 && TREE_CODE (over_return) == TREE_CODE (base_return)
1995 && CLASS_TYPE_P (TREE_TYPE (over_return))
1996 && CLASS_TYPE_P (TREE_TYPE (base_return)))
1998 /* If FN is a covariant thunk, we must figure out the adjustment
1999 to the final base FN was converting to. As OVERRIDER_TARGET might
2000 also be converting to the return type of FN, we have to
2001 combine the two conversions here. */
2002 tree fixed_offset, virtual_offset;
2004 if (DECL_THUNK_P (fn))
2006 gcc_assert (DECL_RESULT_THUNK_P (fn));
2007 fixed_offset = ssize_int (THUNK_FIXED_OFFSET (fn));
2008 virtual_offset = THUNK_VIRTUAL_OFFSET (fn);
2011 fixed_offset = virtual_offset = NULL_TREE;
2014 /* Find the equivalent binfo within the return type of the
2015 overriding function. We will want the vbase offset from
2017 virtual_offset = binfo_for_vbase (BINFO_TYPE (virtual_offset),
2018 TREE_TYPE (over_return));
2019 else if (!same_type_p (TREE_TYPE (over_return),
2020 TREE_TYPE (base_return)))
2022 /* There was no existing virtual thunk (which takes
2027 thunk_binfo = lookup_base (TREE_TYPE (over_return),
2028 TREE_TYPE (base_return),
2029 ba_check | ba_quiet, &kind);
2031 if (thunk_binfo && (kind == bk_via_virtual
2032 || !BINFO_OFFSET_ZEROP (thunk_binfo)))
2034 tree offset = convert (ssizetype, BINFO_OFFSET (thunk_binfo));
2036 if (kind == bk_via_virtual)
2038 /* We convert via virtual base. Find the virtual
2039 base and adjust the fixed offset to be from there. */
2040 while (!BINFO_VIRTUAL_P (thunk_binfo))
2041 thunk_binfo = BINFO_INHERITANCE_CHAIN (thunk_binfo);
2043 virtual_offset = thunk_binfo;
2044 offset = size_diffop
2046 (ssizetype, BINFO_OFFSET (virtual_offset)));
2049 /* There was an existing fixed offset, this must be
2050 from the base just converted to, and the base the
2051 FN was thunking to. */
2052 fixed_offset = size_binop (PLUS_EXPR, fixed_offset, offset);
2054 fixed_offset = offset;
2058 if (fixed_offset || virtual_offset)
2059 /* Replace the overriding function with a covariant thunk. We
2060 will emit the overriding function in its own slot as
2062 overrider_fn = make_thunk (overrider_target, /*this_adjusting=*/0,
2063 fixed_offset, virtual_offset);
2066 gcc_assert (!DECL_THUNK_P (fn));
2068 /* Assume that we will produce a thunk that convert all the way to
2069 the final overrider, and not to an intermediate virtual base. */
2070 virtual_base = NULL_TREE;
2072 /* See if we can convert to an intermediate virtual base first, and then
2073 use the vcall offset located there to finish the conversion. */
2074 for (; b; b = BINFO_INHERITANCE_CHAIN (b))
2076 /* If we find the final overrider, then we can stop
2078 if (SAME_BINFO_TYPE_P (BINFO_TYPE (b),
2079 BINFO_TYPE (TREE_VALUE (overrider))))
2082 /* If we find a virtual base, and we haven't yet found the
2083 overrider, then there is a virtual base between the
2084 declaring base (first_defn) and the final overrider. */
2085 if (BINFO_VIRTUAL_P (b))
2092 if (overrider_fn != overrider_target && !virtual_base)
2094 /* The ABI specifies that a covariant thunk includes a mangling
2095 for a this pointer adjustment. This-adjusting thunks that
2096 override a function from a virtual base have a vcall
2097 adjustment. When the virtual base in question is a primary
2098 virtual base, we know the adjustments are zero, (and in the
2099 non-covariant case, we would not use the thunk).
2100 Unfortunately we didn't notice this could happen, when
2101 designing the ABI and so never mandated that such a covariant
2102 thunk should be emitted. Because we must use the ABI mandated
2103 name, we must continue searching from the binfo where we
2104 found the most recent definition of the function, towards the
2105 primary binfo which first introduced the function into the
2106 vtable. If that enters a virtual base, we must use a vcall
2107 this-adjusting thunk. Bleah! */
2108 tree probe = first_defn;
2110 while ((probe = get_primary_binfo (probe))
2111 && (unsigned) list_length (BINFO_VIRTUALS (probe)) > ix)
2112 if (BINFO_VIRTUAL_P (probe))
2113 virtual_base = probe;
2116 /* Even if we find a virtual base, the correct delta is
2117 between the overrider and the binfo we're building a vtable
2119 goto virtual_covariant;
2122 /* Compute the constant adjustment to the `this' pointer. The
2123 `this' pointer, when this function is called, will point at BINFO
2124 (or one of its primary bases, which are at the same offset). */
2126 /* The `this' pointer needs to be adjusted from the declaration to
2127 the nearest virtual base. */
2128 delta = size_diffop (convert (ssizetype, BINFO_OFFSET (virtual_base)),
2129 convert (ssizetype, BINFO_OFFSET (first_defn)));
2131 /* If the nearest definition is in a lost primary, we don't need an
2132 entry in our vtable. Except possibly in a constructor vtable,
2133 if we happen to get our primary back. In that case, the offset
2134 will be zero, as it will be a primary base. */
2135 delta = size_zero_node;
2137 /* The `this' pointer needs to be adjusted from pointing to
2138 BINFO to pointing at the base where the final overrider
2141 delta = size_diffop (convert (ssizetype,
2142 BINFO_OFFSET (TREE_VALUE (overrider))),
2143 convert (ssizetype, BINFO_OFFSET (binfo)));
2145 modify_vtable_entry (t, binfo, overrider_fn, delta, virtuals);
2148 BV_VCALL_INDEX (*virtuals)
2149 = get_vcall_index (overrider_target, BINFO_TYPE (virtual_base));
2151 BV_VCALL_INDEX (*virtuals) = NULL_TREE;
2154 /* Called from modify_all_vtables via dfs_walk. */
2157 dfs_modify_vtables (tree binfo, void* data)
2159 tree t = (tree) data;
2164 if (!TYPE_CONTAINS_VPTR_P (BINFO_TYPE (binfo)))
2165 /* A base without a vtable needs no modification, and its bases
2166 are uninteresting. */
2167 return dfs_skip_bases;
2169 if (SAME_BINFO_TYPE_P (BINFO_TYPE (binfo), t)
2170 && !CLASSTYPE_HAS_PRIMARY_BASE_P (t))
2171 /* Don't do the primary vtable, if it's new. */
2174 if (BINFO_PRIMARY_P (binfo) && !BINFO_VIRTUAL_P (binfo))
2175 /* There's no need to modify the vtable for a non-virtual primary
2176 base; we're not going to use that vtable anyhow. We do still
2177 need to do this for virtual primary bases, as they could become
2178 non-primary in a construction vtable. */
2181 make_new_vtable (t, binfo);
2183 /* Now, go through each of the virtual functions in the virtual
2184 function table for BINFO. Find the final overrider, and update
2185 the BINFO_VIRTUALS list appropriately. */
2186 for (ix = 0, virtuals = BINFO_VIRTUALS (binfo),
2187 old_virtuals = BINFO_VIRTUALS (TYPE_BINFO (BINFO_TYPE (binfo)));
2189 ix++, virtuals = TREE_CHAIN (virtuals),
2190 old_virtuals = TREE_CHAIN (old_virtuals))
2191 update_vtable_entry_for_fn (t,
2193 BV_FN (old_virtuals),
2199 /* Update all of the primary and secondary vtables for T. Create new
2200 vtables as required, and initialize their RTTI information. Each
2201 of the functions in VIRTUALS is declared in T and may override a
2202 virtual function from a base class; find and modify the appropriate
2203 entries to point to the overriding functions. Returns a list, in
2204 declaration order, of the virtual functions that are declared in T,
2205 but do not appear in the primary base class vtable, and which
2206 should therefore be appended to the end of the vtable for T. */
2209 modify_all_vtables (tree t, tree virtuals)
2211 tree binfo = TYPE_BINFO (t);
2214 /* Update all of the vtables. */
2215 dfs_walk_once (binfo, dfs_modify_vtables, NULL, t);
2217 /* Add virtual functions not already in our primary vtable. These
2218 will be both those introduced by this class, and those overridden
2219 from secondary bases. It does not include virtuals merely
2220 inherited from secondary bases. */
2221 for (fnsp = &virtuals; *fnsp; )
2223 tree fn = TREE_VALUE (*fnsp);
2225 if (!value_member (fn, BINFO_VIRTUALS (binfo))
2226 || DECL_VINDEX (fn) == error_mark_node)
2228 /* We don't need to adjust the `this' pointer when
2229 calling this function. */
2230 BV_DELTA (*fnsp) = integer_zero_node;
2231 BV_VCALL_INDEX (*fnsp) = NULL_TREE;
2233 /* This is a function not already in our vtable. Keep it. */
2234 fnsp = &TREE_CHAIN (*fnsp);
2237 /* We've already got an entry for this function. Skip it. */
2238 *fnsp = TREE_CHAIN (*fnsp);
2244 /* Get the base virtual function declarations in T that have the
2248 get_basefndecls (tree name, tree t)
2251 tree base_fndecls = NULL_TREE;
2252 int n_baseclasses = BINFO_N_BASE_BINFOS (TYPE_BINFO (t));
2255 /* Find virtual functions in T with the indicated NAME. */
2256 i = lookup_fnfields_1 (t, name);
2258 for (methods = VEC_index (tree, CLASSTYPE_METHOD_VEC (t), i);
2260 methods = OVL_NEXT (methods))
2262 tree method = OVL_CURRENT (methods);
2264 if (TREE_CODE (method) == FUNCTION_DECL
2265 && DECL_VINDEX (method))
2266 base_fndecls = tree_cons (NULL_TREE, method, base_fndecls);
2270 return base_fndecls;
2272 for (i = 0; i < n_baseclasses; i++)
2274 tree basetype = BINFO_TYPE (BINFO_BASE_BINFO (TYPE_BINFO (t), i));
2275 base_fndecls = chainon (get_basefndecls (name, basetype),
2279 return base_fndecls;
2282 /* If this declaration supersedes the declaration of
2283 a method declared virtual in the base class, then
2284 mark this field as being virtual as well. */
2287 check_for_override (tree decl, tree ctype)
2289 if (TREE_CODE (decl) == TEMPLATE_DECL)
2290 /* In [temp.mem] we have:
2292 A specialization of a member function template does not
2293 override a virtual function from a base class. */
2295 if ((DECL_DESTRUCTOR_P (decl)
2296 || IDENTIFIER_VIRTUAL_P (DECL_NAME (decl))
2297 || DECL_CONV_FN_P (decl))
2298 && look_for_overrides (ctype, decl)
2299 && !DECL_STATIC_FUNCTION_P (decl))
2300 /* Set DECL_VINDEX to a value that is neither an INTEGER_CST nor
2301 the error_mark_node so that we know it is an overriding
2303 DECL_VINDEX (decl) = decl;
2305 if (DECL_VIRTUAL_P (decl))
2307 if (!DECL_VINDEX (decl))
2308 DECL_VINDEX (decl) = error_mark_node;
2309 IDENTIFIER_VIRTUAL_P (DECL_NAME (decl)) = 1;
2313 /* Warn about hidden virtual functions that are not overridden in t.
2314 We know that constructors and destructors don't apply. */
2317 warn_hidden (tree t)
2319 VEC(tree) *method_vec = CLASSTYPE_METHOD_VEC (t);
2323 /* We go through each separately named virtual function. */
2324 for (i = CLASSTYPE_FIRST_CONVERSION_SLOT;
2325 VEC_iterate (tree, method_vec, i, fns);
2336 /* All functions in this slot in the CLASSTYPE_METHOD_VEC will
2337 have the same name. Figure out what name that is. */
2338 name = DECL_NAME (OVL_CURRENT (fns));
2339 /* There are no possibly hidden functions yet. */
2340 base_fndecls = NULL_TREE;
2341 /* Iterate through all of the base classes looking for possibly
2342 hidden functions. */
2343 for (binfo = TYPE_BINFO (t), j = 0;
2344 BINFO_BASE_ITERATE (binfo, j, base_binfo); j++)
2346 tree basetype = BINFO_TYPE (base_binfo);
2347 base_fndecls = chainon (get_basefndecls (name, basetype),
2351 /* If there are no functions to hide, continue. */
2355 /* Remove any overridden functions. */
2356 for (fn = fns; fn; fn = OVL_NEXT (fn))
2358 fndecl = OVL_CURRENT (fn);
2359 if (DECL_VINDEX (fndecl))
2361 tree *prev = &base_fndecls;
2364 /* If the method from the base class has the same
2365 signature as the method from the derived class, it
2366 has been overridden. */
2367 if (same_signature_p (fndecl, TREE_VALUE (*prev)))
2368 *prev = TREE_CHAIN (*prev);
2370 prev = &TREE_CHAIN (*prev);
2374 /* Now give a warning for all base functions without overriders,
2375 as they are hidden. */
2376 while (base_fndecls)
2378 /* Here we know it is a hider, and no overrider exists. */
2379 cp_warning_at ("%qD was hidden", TREE_VALUE (base_fndecls));
2380 cp_warning_at (" by %qD", fns);
2381 base_fndecls = TREE_CHAIN (base_fndecls);
2386 /* Check for things that are invalid. There are probably plenty of other
2387 things we should check for also. */
2390 finish_struct_anon (tree t)
2394 for (field = TYPE_FIELDS (t); field; field = TREE_CHAIN (field))
2396 if (TREE_STATIC (field))
2398 if (TREE_CODE (field) != FIELD_DECL)
2401 if (DECL_NAME (field) == NULL_TREE
2402 && ANON_AGGR_TYPE_P (TREE_TYPE (field)))
2404 tree elt = TYPE_FIELDS (TREE_TYPE (field));
2405 for (; elt; elt = TREE_CHAIN (elt))
2407 /* We're generally only interested in entities the user
2408 declared, but we also find nested classes by noticing
2409 the TYPE_DECL that we create implicitly. You're
2410 allowed to put one anonymous union inside another,
2411 though, so we explicitly tolerate that. We use
2412 TYPE_ANONYMOUS_P rather than ANON_AGGR_TYPE_P so that
2413 we also allow unnamed types used for defining fields. */
2414 if (DECL_ARTIFICIAL (elt)
2415 && (!DECL_IMPLICIT_TYPEDEF_P (elt)
2416 || TYPE_ANONYMOUS_P (TREE_TYPE (elt))))
2419 if (TREE_CODE (elt) != FIELD_DECL)
2421 cp_pedwarn_at ("%q#D invalid; an anonymous union can "
2422 "only have non-static data members",
2427 if (TREE_PRIVATE (elt))
2428 cp_pedwarn_at ("private member %q#D in anonymous union",
2430 else if (TREE_PROTECTED (elt))
2431 cp_pedwarn_at ("protected member %q#D in anonymous union",
2434 TREE_PRIVATE (elt) = TREE_PRIVATE (field);
2435 TREE_PROTECTED (elt) = TREE_PROTECTED (field);
2441 /* Add T to CLASSTYPE_DECL_LIST of current_class_type which
2442 will be used later during class template instantiation.
2443 When FRIEND_P is zero, T can be a static member data (VAR_DECL),
2444 a non-static member data (FIELD_DECL), a member function
2445 (FUNCTION_DECL), a nested type (RECORD_TYPE, ENUM_TYPE),
2446 a typedef (TYPE_DECL) or a member class template (TEMPLATE_DECL)
2447 When FRIEND_P is nonzero, T is either a friend class
2448 (RECORD_TYPE, TEMPLATE_DECL) or a friend function
2449 (FUNCTION_DECL, TEMPLATE_DECL). */
2452 maybe_add_class_template_decl_list (tree type, tree t, int friend_p)
2454 /* Save some memory by not creating TREE_LIST if TYPE is not template. */
2455 if (CLASSTYPE_TEMPLATE_INFO (type))
2456 CLASSTYPE_DECL_LIST (type)
2457 = tree_cons (friend_p ? NULL_TREE : type,
2458 t, CLASSTYPE_DECL_LIST (type));
2461 /* Create default constructors, assignment operators, and so forth for
2462 the type indicated by T, if they are needed.
2463 CANT_HAVE_DEFAULT_CTOR, CANT_HAVE_CONST_CTOR, and
2464 CANT_HAVE_CONST_ASSIGNMENT are nonzero if, for whatever reason, the
2465 class cannot have a default constructor, copy constructor taking a
2466 const reference argument, or an assignment operator taking a const
2467 reference, respectively. If a virtual destructor is created, its
2468 DECL is returned; otherwise the return value is NULL_TREE. */
2471 add_implicitly_declared_members (tree t,
2472 int cant_have_default_ctor,
2473 int cant_have_const_cctor,
2474 int cant_have_const_assignment)
2477 tree implicit_fns = NULL_TREE;
2478 tree virtual_dtor = NULL_TREE;
2482 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (t) && !TYPE_HAS_DESTRUCTOR (t))
2484 default_fn = implicitly_declare_fn (sfk_destructor, t, /*const_p=*/0);
2485 check_for_override (default_fn, t);
2487 /* If we couldn't make it work, then pretend we didn't need it. */
2488 if (default_fn == void_type_node)
2489 TYPE_HAS_NONTRIVIAL_DESTRUCTOR (t) = 0;
2492 TREE_CHAIN (default_fn) = implicit_fns;
2493 implicit_fns = default_fn;
2495 if (DECL_VINDEX (default_fn))
2496 virtual_dtor = default_fn;
2500 /* Any non-implicit destructor is non-trivial. */
2501 TYPE_HAS_NONTRIVIAL_DESTRUCTOR (t) |= TYPE_HAS_DESTRUCTOR (t);
2503 /* Default constructor. */
2504 if (! TYPE_HAS_CONSTRUCTOR (t) && ! cant_have_default_ctor)
2506 TYPE_HAS_DEFAULT_CONSTRUCTOR (t) = 1;
2507 CLASSTYPE_LAZY_DEFAULT_CTOR (t) = 1;
2510 /* Copy constructor. */
2511 if (! TYPE_HAS_INIT_REF (t) && ! TYPE_FOR_JAVA (t))
2513 TYPE_HAS_INIT_REF (t) = 1;
2514 TYPE_HAS_CONST_INIT_REF (t) = !cant_have_const_cctor;
2515 CLASSTYPE_LAZY_COPY_CTOR (t) = 1;
2516 TYPE_HAS_CONSTRUCTOR (t) = 1;
2519 /* If there is no assignment operator, one will be created if and
2520 when it is needed. For now, just record whether or not the type
2521 of the parameter to the assignment operator will be a const or
2522 non-const reference. */
2523 if (!TYPE_HAS_ASSIGN_REF (t) && !TYPE_FOR_JAVA (t))
2525 TYPE_HAS_ASSIGN_REF (t) = 1;
2526 TYPE_HAS_CONST_ASSIGN_REF (t) = !cant_have_const_assignment;
2527 CLASSTYPE_LAZY_ASSIGNMENT_OP (t) = 1;
2530 /* Now, hook all of the new functions on to TYPE_METHODS,
2531 and add them to the CLASSTYPE_METHOD_VEC. */
2532 for (f = &implicit_fns; *f; f = &TREE_CHAIN (*f))
2535 maybe_add_class_template_decl_list (current_class_type, *f, /*friend_p=*/0);
2537 if (abi_version_at_least (2))
2538 /* G++ 3.2 put the implicit destructor at the *beginning* of the
2539 list, which cause the destructor to be emitted in an incorrect
2540 location in the vtable. */
2541 TYPE_METHODS (t) = chainon (TYPE_METHODS (t), implicit_fns);
2544 if (warn_abi && virtual_dtor)
2545 warning ("vtable layout for class %qT may not be ABI-compliant "
2546 "and may change in a future version of GCC due to implicit "
2547 "virtual destructor",
2549 *f = TYPE_METHODS (t);
2550 TYPE_METHODS (t) = implicit_fns;
2554 /* Subroutine of finish_struct_1. Recursively count the number of fields
2555 in TYPE, including anonymous union members. */
2558 count_fields (tree fields)
2562 for (x = fields; x; x = TREE_CHAIN (x))
2564 if (TREE_CODE (x) == FIELD_DECL && ANON_AGGR_TYPE_P (TREE_TYPE (x)))
2565 n_fields += count_fields (TYPE_FIELDS (TREE_TYPE (x)));
2572 /* Subroutine of finish_struct_1. Recursively add all the fields in the
2573 TREE_LIST FIELDS to the SORTED_FIELDS_TYPE elts, starting at offset IDX. */
2576 add_fields_to_record_type (tree fields, struct sorted_fields_type *field_vec, int idx)
2579 for (x = fields; x; x = TREE_CHAIN (x))
2581 if (TREE_CODE (x) == FIELD_DECL && ANON_AGGR_TYPE_P (TREE_TYPE (x)))
2582 idx = add_fields_to_record_type (TYPE_FIELDS (TREE_TYPE (x)), field_vec, idx);
2584 field_vec->elts[idx++] = x;
2589 /* FIELD is a bit-field. We are finishing the processing for its
2590 enclosing type. Issue any appropriate messages and set appropriate
2594 check_bitfield_decl (tree field)
2596 tree type = TREE_TYPE (field);
2599 /* Detect invalid bit-field type. */
2600 if (DECL_INITIAL (field)
2601 && ! INTEGRAL_TYPE_P (TREE_TYPE (field)))
2603 cp_error_at ("bit-field %q#D with non-integral type", field);
2604 w = error_mark_node;
2607 /* Detect and ignore out of range field width. */
2608 if (DECL_INITIAL (field))
2610 w = DECL_INITIAL (field);
2612 /* Avoid the non_lvalue wrapper added by fold for PLUS_EXPRs. */
2615 /* detect invalid field size. */
2616 if (TREE_CODE (w) == CONST_DECL)
2617 w = DECL_INITIAL (w);
2619 w = decl_constant_value (w);
2621 if (TREE_CODE (w) != INTEGER_CST)
2623 cp_error_at ("bit-field %qD width not an integer constant",
2625 w = error_mark_node;
2627 else if (tree_int_cst_sgn (w) < 0)
2629 cp_error_at ("negative width in bit-field %qD", field);
2630 w = error_mark_node;
2632 else if (integer_zerop (w) && DECL_NAME (field) != 0)
2634 cp_error_at ("zero width for bit-field %qD", field);
2635 w = error_mark_node;
2637 else if (compare_tree_int (w, TYPE_PRECISION (type)) > 0
2638 && TREE_CODE (type) != ENUMERAL_TYPE
2639 && TREE_CODE (type) != BOOLEAN_TYPE)
2640 cp_warning_at ("width of %qD exceeds its type", field);
2641 else if (TREE_CODE (type) == ENUMERAL_TYPE
2642 && (0 > compare_tree_int (w,
2643 min_precision (TYPE_MIN_VALUE (type),
2644 TYPE_UNSIGNED (type)))
2645 || 0 > compare_tree_int (w,
2647 (TYPE_MAX_VALUE (type),
2648 TYPE_UNSIGNED (type)))))
2649 cp_warning_at ("%qD is too small to hold all values of %q#T",
2653 /* Remove the bit-field width indicator so that the rest of the
2654 compiler does not treat that value as an initializer. */
2655 DECL_INITIAL (field) = NULL_TREE;
2657 if (w != error_mark_node)
2659 DECL_SIZE (field) = convert (bitsizetype, w);
2660 DECL_BIT_FIELD (field) = 1;
2664 /* Non-bit-fields are aligned for their type. */
2665 DECL_BIT_FIELD (field) = 0;
2666 CLEAR_DECL_C_BIT_FIELD (field);
2670 /* FIELD is a non bit-field. We are finishing the processing for its
2671 enclosing type T. Issue any appropriate messages and set appropriate
2675 check_field_decl (tree field,
2677 int* cant_have_const_ctor,
2678 int* cant_have_default_ctor,
2679 int* no_const_asn_ref,
2680 int* any_default_members)
2682 tree type = strip_array_types (TREE_TYPE (field));
2684 /* An anonymous union cannot contain any fields which would change
2685 the settings of CANT_HAVE_CONST_CTOR and friends. */
2686 if (ANON_UNION_TYPE_P (type))
2688 /* And, we don't set TYPE_HAS_CONST_INIT_REF, etc., for anonymous
2689 structs. So, we recurse through their fields here. */
2690 else if (ANON_AGGR_TYPE_P (type))
2694 for (fields = TYPE_FIELDS (type); fields; fields = TREE_CHAIN (fields))
2695 if (TREE_CODE (fields) == FIELD_DECL && !DECL_C_BIT_FIELD (field))
2696 check_field_decl (fields, t, cant_have_const_ctor,
2697 cant_have_default_ctor, no_const_asn_ref,
2698 any_default_members);
2700 /* Check members with class type for constructors, destructors,
2702 else if (CLASS_TYPE_P (type))
2704 /* Never let anything with uninheritable virtuals
2705 make it through without complaint. */
2706 abstract_virtuals_error (field, type);
2708 if (TREE_CODE (t) == UNION_TYPE)
2710 if (TYPE_NEEDS_CONSTRUCTING (type))
2711 cp_error_at ("member %q#D with constructor not allowed in union",
2713 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type))
2714 cp_error_at ("member %q#D with destructor not allowed in union",
2716 if (TYPE_HAS_COMPLEX_ASSIGN_REF (type))
2717 cp_error_at ("member %q#D with copy assignment operator not allowed in union",
2722 TYPE_NEEDS_CONSTRUCTING (t) |= TYPE_NEEDS_CONSTRUCTING (type);
2723 TYPE_HAS_NONTRIVIAL_DESTRUCTOR (t)
2724 |= TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type);
2725 TYPE_HAS_COMPLEX_ASSIGN_REF (t) |= TYPE_HAS_COMPLEX_ASSIGN_REF (type);
2726 TYPE_HAS_COMPLEX_INIT_REF (t) |= TYPE_HAS_COMPLEX_INIT_REF (type);
2729 if (!TYPE_HAS_CONST_INIT_REF (type))
2730 *cant_have_const_ctor = 1;
2732 if (!TYPE_HAS_CONST_ASSIGN_REF (type))
2733 *no_const_asn_ref = 1;
2735 if (TYPE_HAS_CONSTRUCTOR (type)
2736 && ! TYPE_HAS_DEFAULT_CONSTRUCTOR (type))
2737 *cant_have_default_ctor = 1;
2739 if (DECL_INITIAL (field) != NULL_TREE)
2741 /* `build_class_init_list' does not recognize
2743 if (TREE_CODE (t) == UNION_TYPE && any_default_members != 0)
2744 error ("multiple fields in union %qT initialized", t);
2745 *any_default_members = 1;
2749 /* Check the data members (both static and non-static), class-scoped
2750 typedefs, etc., appearing in the declaration of T. Issue
2751 appropriate diagnostics. Sets ACCESS_DECLS to a list (in
2752 declaration order) of access declarations; each TREE_VALUE in this
2753 list is a USING_DECL.
2755 In addition, set the following flags:
2758 The class is empty, i.e., contains no non-static data members.
2760 CANT_HAVE_DEFAULT_CTOR_P
2761 This class cannot have an implicitly generated default
2764 CANT_HAVE_CONST_CTOR_P
2765 This class cannot have an implicitly generated copy constructor
2766 taking a const reference.
2768 CANT_HAVE_CONST_ASN_REF
2769 This class cannot have an implicitly generated assignment
2770 operator taking a const reference.
2772 All of these flags should be initialized before calling this
2775 Returns a pointer to the end of the TYPE_FIELDs chain; additional
2776 fields can be added by adding to this chain. */
2779 check_field_decls (tree t, tree *access_decls,
2780 int *cant_have_default_ctor_p,
2781 int *cant_have_const_ctor_p,
2782 int *no_const_asn_ref_p)
2787 int any_default_members;
2789 /* Assume there are no access declarations. */
2790 *access_decls = NULL_TREE;
2791 /* Assume this class has no pointer members. */
2792 has_pointers = false;
2793 /* Assume none of the members of this class have default
2795 any_default_members = 0;
2797 for (field = &TYPE_FIELDS (t); *field; field = next)
2800 tree type = TREE_TYPE (x);
2802 next = &TREE_CHAIN (x);
2804 if (TREE_CODE (x) == FIELD_DECL)
2806 if (TYPE_PACKED (t))
2808 if (!pod_type_p (TREE_TYPE (x)) && !TYPE_PACKED (TREE_TYPE (x)))
2810 ("ignoring packed attribute on unpacked non-POD field %q#D",
2813 DECL_PACKED (x) = 1;
2816 if (DECL_C_BIT_FIELD (x) && integer_zerop (DECL_INITIAL (x)))
2817 /* We don't treat zero-width bitfields as making a class
2824 /* The class is non-empty. */
2825 CLASSTYPE_EMPTY_P (t) = 0;
2826 /* The class is not even nearly empty. */
2827 CLASSTYPE_NEARLY_EMPTY_P (t) = 0;
2828 /* If one of the data members contains an empty class,
2830 element_type = strip_array_types (type);
2831 if (CLASS_TYPE_P (element_type)
2832 && CLASSTYPE_CONTAINS_EMPTY_CLASS_P (element_type))
2833 CLASSTYPE_CONTAINS_EMPTY_CLASS_P (t) = 1;
2837 if (TREE_CODE (x) == USING_DECL)
2839 /* Prune the access declaration from the list of fields. */
2840 *field = TREE_CHAIN (x);
2842 /* Save the access declarations for our caller. */
2843 *access_decls = tree_cons (NULL_TREE, x, *access_decls);
2845 /* Since we've reset *FIELD there's no reason to skip to the
2851 if (TREE_CODE (x) == TYPE_DECL
2852 || TREE_CODE (x) == TEMPLATE_DECL)
2855 /* If we've gotten this far, it's a data member, possibly static,
2856 or an enumerator. */
2857 DECL_CONTEXT (x) = t;
2859 /* When this goes into scope, it will be a non-local reference. */
2860 DECL_NONLOCAL (x) = 1;
2862 if (TREE_CODE (t) == UNION_TYPE)
2866 If a union contains a static data member, or a member of
2867 reference type, the program is ill-formed. */
2868 if (TREE_CODE (x) == VAR_DECL)
2870 cp_error_at ("%qD may not be static because it is a member of a union", x);
2873 if (TREE_CODE (type) == REFERENCE_TYPE)
2875 cp_error_at ("%qD may not have reference type %qT because"
2876 " it is a member of a union",
2882 /* ``A local class cannot have static data members.'' ARM 9.4 */
2883 if (current_function_decl && TREE_STATIC (x))
2884 cp_error_at ("field %qD in local class cannot be static", x);
2886 /* Perform error checking that did not get done in
2888 if (TREE_CODE (type) == FUNCTION_TYPE)
2890 cp_error_at ("field %qD invalidly declared function type", x);
2891 type = build_pointer_type (type);
2892 TREE_TYPE (x) = type;
2894 else if (TREE_CODE (type) == METHOD_TYPE)
2896 cp_error_at ("field %qD invalidly declared method type", x);
2897 type = build_pointer_type (type);
2898 TREE_TYPE (x) = type;
2901 if (type == error_mark_node)
2904 if (TREE_CODE (x) == CONST_DECL || TREE_CODE (x) == VAR_DECL)
2907 /* Now it can only be a FIELD_DECL. */
2909 if (TREE_PRIVATE (x) || TREE_PROTECTED (x))
2910 CLASSTYPE_NON_AGGREGATE (t) = 1;
2912 /* If this is of reference type, check if it needs an init.
2913 Also do a little ANSI jig if necessary. */
2914 if (TREE_CODE (type) == REFERENCE_TYPE)
2916 CLASSTYPE_NON_POD_P (t) = 1;
2917 if (DECL_INITIAL (x) == NULL_TREE)
2918 SET_CLASSTYPE_REF_FIELDS_NEED_INIT (t, 1);
2920 /* ARM $12.6.2: [A member initializer list] (or, for an
2921 aggregate, initialization by a brace-enclosed list) is the
2922 only way to initialize nonstatic const and reference
2924 *cant_have_default_ctor_p = 1;
2925 TYPE_HAS_COMPLEX_ASSIGN_REF (t) = 1;
2927 if (! TYPE_HAS_CONSTRUCTOR (t) && CLASSTYPE_NON_AGGREGATE (t)
2929 cp_warning_at ("non-static reference %q#D in class without a constructor", x);
2932 type = strip_array_types (type);
2934 /* This is used by -Weffc++ (see below). Warn only for pointers
2935 to members which might hold dynamic memory. So do not warn
2936 for pointers to functions or pointers to members. */
2937 if (TYPE_PTR_P (type)
2938 && !TYPE_PTRFN_P (type)
2939 && !TYPE_PTR_TO_MEMBER_P (type))
2940 has_pointers = true;
2942 if (CLASS_TYPE_P (type))
2944 if (CLASSTYPE_REF_FIELDS_NEED_INIT (type))
2945 SET_CLASSTYPE_REF_FIELDS_NEED_INIT (t, 1);
2946 if (CLASSTYPE_READONLY_FIELDS_NEED_INIT (type))
2947 SET_CLASSTYPE_READONLY_FIELDS_NEED_INIT (t, 1);
2950 if (DECL_MUTABLE_P (x) || TYPE_HAS_MUTABLE_P (type))
2951 CLASSTYPE_HAS_MUTABLE (t) = 1;
2953 if (! pod_type_p (type))
2954 /* DR 148 now allows pointers to members (which are POD themselves),
2955 to be allowed in POD structs. */
2956 CLASSTYPE_NON_POD_P (t) = 1;
2958 if (! zero_init_p (type))
2959 CLASSTYPE_NON_ZERO_INIT_P (t) = 1;
2961 /* If any field is const, the structure type is pseudo-const. */
2962 if (CP_TYPE_CONST_P (type))
2964 C_TYPE_FIELDS_READONLY (t) = 1;
2965 if (DECL_INITIAL (x) == NULL_TREE)
2966 SET_CLASSTYPE_READONLY_FIELDS_NEED_INIT (t, 1);
2968 /* ARM $12.6.2: [A member initializer list] (or, for an
2969 aggregate, initialization by a brace-enclosed list) is the
2970 only way to initialize nonstatic const and reference
2972 *cant_have_default_ctor_p = 1;
2973 TYPE_HAS_COMPLEX_ASSIGN_REF (t) = 1;
2975 if (! TYPE_HAS_CONSTRUCTOR (t) && CLASSTYPE_NON_AGGREGATE (t)
2977 cp_warning_at ("non-static const member %q#D in class without a constructor", x);
2979 /* A field that is pseudo-const makes the structure likewise. */
2980 else if (CLASS_TYPE_P (type))
2982 C_TYPE_FIELDS_READONLY (t) |= C_TYPE_FIELDS_READONLY (type);
2983 SET_CLASSTYPE_READONLY_FIELDS_NEED_INIT (t,
2984 CLASSTYPE_READONLY_FIELDS_NEED_INIT (t)
2985 | CLASSTYPE_READONLY_FIELDS_NEED_INIT (type));
2988 /* Core issue 80: A nonstatic data member is required to have a
2989 different name from the class iff the class has a
2990 user-defined constructor. */
2991 if (constructor_name_p (DECL_NAME (x), t) && TYPE_HAS_CONSTRUCTOR (t))
2992 cp_pedwarn_at ("field %q#D with same name as class", x);
2994 /* We set DECL_C_BIT_FIELD in grokbitfield.
2995 If the type and width are valid, we'll also set DECL_BIT_FIELD. */
2996 if (DECL_C_BIT_FIELD (x))
2997 check_bitfield_decl (x);
2999 check_field_decl (x, t,
3000 cant_have_const_ctor_p,
3001 cant_have_default_ctor_p,
3003 &any_default_members);
3006 /* Effective C++ rule 11: if a class has dynamic memory held by pointers,
3007 it should also define a copy constructor and an assignment operator to
3008 implement the correct copy semantic (deep vs shallow, etc.). As it is
3009 not feasible to check whether the constructors do allocate dynamic memory
3010 and store it within members, we approximate the warning like this:
3012 -- Warn only if there are members which are pointers
3013 -- Warn only if there is a non-trivial constructor (otherwise,
3014 there cannot be memory allocated).
3015 -- Warn only if there is a non-trivial destructor. We assume that the
3016 user at least implemented the cleanup correctly, and a destructor
3017 is needed to free dynamic memory.
3019 This seems enough for practical purposes. */
3022 && TYPE_HAS_CONSTRUCTOR (t)
3023 && TYPE_HAS_DESTRUCTOR (t)
3024 && !(TYPE_HAS_INIT_REF (t) && TYPE_HAS_ASSIGN_REF (t)))
3026 warning ("%q#T has pointer data members", t);
3028 if (! TYPE_HAS_INIT_REF (t))
3030 warning (" but does not override %<%T(const %T&)%>", t, t);
3031 if (! TYPE_HAS_ASSIGN_REF (t))
3032 warning (" or %<operator=(const %T&)%>", t);
3034 else if (! TYPE_HAS_ASSIGN_REF (t))
3035 warning (" but does not override %<operator=(const %T&)%>", t);
3039 /* Check anonymous struct/anonymous union fields. */
3040 finish_struct_anon (t);
3042 /* We've built up the list of access declarations in reverse order.
3044 *access_decls = nreverse (*access_decls);
3047 /* If TYPE is an empty class type, records its OFFSET in the table of
3051 record_subobject_offset (tree type, tree offset, splay_tree offsets)
3055 if (!is_empty_class (type))
3058 /* Record the location of this empty object in OFFSETS. */
3059 n = splay_tree_lookup (offsets, (splay_tree_key) offset);
3061 n = splay_tree_insert (offsets,
3062 (splay_tree_key) offset,
3063 (splay_tree_value) NULL_TREE);
3064 n->value = ((splay_tree_value)
3065 tree_cons (NULL_TREE,
3072 /* Returns nonzero if TYPE is an empty class type and there is
3073 already an entry in OFFSETS for the same TYPE as the same OFFSET. */
3076 check_subobject_offset (tree type, tree offset, splay_tree offsets)
3081 if (!is_empty_class (type))
3084 /* Record the location of this empty object in OFFSETS. */
3085 n = splay_tree_lookup (offsets, (splay_tree_key) offset);
3089 for (t = (tree) n->value; t; t = TREE_CHAIN (t))
3090 if (same_type_p (TREE_VALUE (t), type))
3096 /* Walk through all the subobjects of TYPE (located at OFFSET). Call
3097 F for every subobject, passing it the type, offset, and table of
3098 OFFSETS. If VBASES_P is one, then virtual non-primary bases should
3101 If MAX_OFFSET is non-NULL, then subobjects with an offset greater
3102 than MAX_OFFSET will not be walked.
3104 If F returns a nonzero value, the traversal ceases, and that value
3105 is returned. Otherwise, returns zero. */
3108 walk_subobject_offsets (tree type,
3109 subobject_offset_fn f,
3116 tree type_binfo = NULL_TREE;
3118 /* If this OFFSET is bigger than the MAX_OFFSET, then we should
3120 if (max_offset && INT_CST_LT (max_offset, offset))
3125 if (abi_version_at_least (2))
3127 type = BINFO_TYPE (type);
3130 if (CLASS_TYPE_P (type))
3136 /* Avoid recursing into objects that are not interesting. */
3137 if (!CLASSTYPE_CONTAINS_EMPTY_CLASS_P (type))
3140 /* Record the location of TYPE. */
3141 r = (*f) (type, offset, offsets);
3145 /* Iterate through the direct base classes of TYPE. */
3147 type_binfo = TYPE_BINFO (type);
3148 for (i = 0; BINFO_BASE_ITERATE (type_binfo, i, binfo); i++)
3152 if (abi_version_at_least (2)
3153 && BINFO_VIRTUAL_P (binfo))
3157 && BINFO_VIRTUAL_P (binfo)
3158 && !BINFO_PRIMARY_P (binfo))
3161 if (!abi_version_at_least (2))
3162 binfo_offset = size_binop (PLUS_EXPR,
3164 BINFO_OFFSET (binfo));
3168 /* We cannot rely on BINFO_OFFSET being set for the base
3169 class yet, but the offsets for direct non-virtual
3170 bases can be calculated by going back to the TYPE. */
3171 orig_binfo = BINFO_BASE_BINFO (TYPE_BINFO (type), i);
3172 binfo_offset = size_binop (PLUS_EXPR,
3174 BINFO_OFFSET (orig_binfo));
3177 r = walk_subobject_offsets (binfo,
3182 (abi_version_at_least (2)
3183 ? /*vbases_p=*/0 : vbases_p));
3188 if (abi_version_at_least (2) && CLASSTYPE_VBASECLASSES (type))
3193 /* Iterate through the virtual base classes of TYPE. In G++
3194 3.2, we included virtual bases in the direct base class
3195 loop above, which results in incorrect results; the
3196 correct offsets for virtual bases are only known when
3197 working with the most derived type. */
3199 for (vbases = CLASSTYPE_VBASECLASSES (type), ix = 0;
3200 VEC_iterate (tree, vbases, ix, binfo); ix++)
3202 r = walk_subobject_offsets (binfo,
3204 size_binop (PLUS_EXPR,
3206 BINFO_OFFSET (binfo)),
3215 /* We still have to walk the primary base, if it is
3216 virtual. (If it is non-virtual, then it was walked
3218 tree vbase = get_primary_binfo (type_binfo);
3220 if (vbase && BINFO_VIRTUAL_P (vbase)
3221 && BINFO_PRIMARY_P (vbase)
3222 && BINFO_INHERITANCE_CHAIN (vbase) == type_binfo)
3224 r = (walk_subobject_offsets
3226 offsets, max_offset, /*vbases_p=*/0));
3233 /* Iterate through the fields of TYPE. */
3234 for (field = TYPE_FIELDS (type); field; field = TREE_CHAIN (field))
3235 if (TREE_CODE (field) == FIELD_DECL && !DECL_ARTIFICIAL (field))
3239 if (abi_version_at_least (2))
3240 field_offset = byte_position (field);
3242 /* In G++ 3.2, DECL_FIELD_OFFSET was used. */
3243 field_offset = DECL_FIELD_OFFSET (field);
3245 r = walk_subobject_offsets (TREE_TYPE (field),
3247 size_binop (PLUS_EXPR,
3257 else if (TREE_CODE (type) == ARRAY_TYPE)
3259 tree element_type = strip_array_types (type);
3260 tree domain = TYPE_DOMAIN (type);
3263 /* Avoid recursing into objects that are not interesting. */
3264 if (!CLASS_TYPE_P (element_type)
3265 || !CLASSTYPE_CONTAINS_EMPTY_CLASS_P (element_type))
3268 /* Step through each of the elements in the array. */
3269 for (index = size_zero_node;
3270 /* G++ 3.2 had an off-by-one error here. */
3271 (abi_version_at_least (2)
3272 ? !INT_CST_LT (TYPE_MAX_VALUE (domain), index)
3273 : INT_CST_LT (index, TYPE_MAX_VALUE (domain)));
3274 index = size_binop (PLUS_EXPR, index, size_one_node))
3276 r = walk_subobject_offsets (TREE_TYPE (type),
3284 offset = size_binop (PLUS_EXPR, offset,
3285 TYPE_SIZE_UNIT (TREE_TYPE (type)));
3286 /* If this new OFFSET is bigger than the MAX_OFFSET, then
3287 there's no point in iterating through the remaining
3288 elements of the array. */
3289 if (max_offset && INT_CST_LT (max_offset, offset))
3297 /* Record all of the empty subobjects of TYPE (located at OFFSET) in
3298 OFFSETS. If VBASES_P is nonzero, virtual bases of TYPE are
3302 record_subobject_offsets (tree type,
3307 walk_subobject_offsets (type, record_subobject_offset, offset,
3308 offsets, /*max_offset=*/NULL_TREE, vbases_p);
3311 /* Returns nonzero if any of the empty subobjects of TYPE (located at
3312 OFFSET) conflict with entries in OFFSETS. If VBASES_P is nonzero,
3313 virtual bases of TYPE are examined. */
3316 layout_conflict_p (tree type,
3321 splay_tree_node max_node;
3323 /* Get the node in OFFSETS that indicates the maximum offset where
3324 an empty subobject is located. */
3325 max_node = splay_tree_max (offsets);
3326 /* If there aren't any empty subobjects, then there's no point in
3327 performing this check. */
3331 return walk_subobject_offsets (type, check_subobject_offset, offset,
3332 offsets, (tree) (max_node->key),
3336 /* DECL is a FIELD_DECL corresponding either to a base subobject of a
3337 non-static data member of the type indicated by RLI. BINFO is the
3338 binfo corresponding to the base subobject, OFFSETS maps offsets to
3339 types already located at those offsets. This function determines
3340 the position of the DECL. */
3343 layout_nonempty_base_or_field (record_layout_info rli,
3348 tree offset = NULL_TREE;
3354 /* For the purposes of determining layout conflicts, we want to
3355 use the class type of BINFO; TREE_TYPE (DECL) will be the
3356 CLASSTYPE_AS_BASE version, which does not contain entries for
3357 zero-sized bases. */
3358 type = TREE_TYPE (binfo);
3363 type = TREE_TYPE (decl);
3367 /* Try to place the field. It may take more than one try if we have
3368 a hard time placing the field without putting two objects of the
3369 same type at the same address. */
3372 struct record_layout_info_s old_rli = *rli;
3374 /* Place this field. */
3375 place_field (rli, decl);
3376 offset = byte_position (decl);
3378 /* We have to check to see whether or not there is already
3379 something of the same type at the offset we're about to use.
3380 For example, consider:
3383 struct T : public S { int i; };
3384 struct U : public S, public T {};
3386 Here, we put S at offset zero in U. Then, we can't put T at
3387 offset zero -- its S component would be at the same address
3388 as the S we already allocated. So, we have to skip ahead.
3389 Since all data members, including those whose type is an
3390 empty class, have nonzero size, any overlap can happen only
3391 with a direct or indirect base-class -- it can't happen with
3393 /* In a union, overlap is permitted; all members are placed at
3395 if (TREE_CODE (rli->t) == UNION_TYPE)
3397 /* G++ 3.2 did not check for overlaps when placing a non-empty
3399 if (!abi_version_at_least (2) && binfo && BINFO_VIRTUAL_P (binfo))
3401 if (layout_conflict_p (field_p ? type : binfo, offset,
3404 /* Strip off the size allocated to this field. That puts us
3405 at the first place we could have put the field with
3406 proper alignment. */
3409 /* Bump up by the alignment required for the type. */
3411 = size_binop (PLUS_EXPR, rli->bitpos,
3413 ? CLASSTYPE_ALIGN (type)
3414 : TYPE_ALIGN (type)));
3415 normalize_rli (rli);
3418 /* There was no conflict. We're done laying out this field. */
3422 /* Now that we know where it will be placed, update its
3424 if (binfo && CLASS_TYPE_P (BINFO_TYPE (binfo)))
3425 /* Indirect virtual bases may have a nonzero BINFO_OFFSET at
3426 this point because their BINFO_OFFSET is copied from another
3427 hierarchy. Therefore, we may not need to add the entire
3429 propagate_binfo_offsets (binfo,
3430 size_diffop (convert (ssizetype, offset),
3432 BINFO_OFFSET (binfo))));
3435 /* Returns true if TYPE is empty and OFFSET is nonzero. */
3438 empty_base_at_nonzero_offset_p (tree type,
3440 splay_tree offsets ATTRIBUTE_UNUSED)
3442 return is_empty_class (type) && !integer_zerop (offset);
3445 /* Layout the empty base BINFO. EOC indicates the byte currently just
3446 past the end of the class, and should be correctly aligned for a
3447 class of the type indicated by BINFO; OFFSETS gives the offsets of
3448 the empty bases allocated so far. T is the most derived
3449 type. Return nonzero iff we added it at the end. */
3452 layout_empty_base (tree binfo, tree eoc, splay_tree offsets)
3455 tree basetype = BINFO_TYPE (binfo);
3458 /* This routine should only be used for empty classes. */
3459 gcc_assert (is_empty_class (basetype));
3460 alignment = ssize_int (CLASSTYPE_ALIGN_UNIT (basetype));
3462 if (!integer_zerop (BINFO_OFFSET (binfo)))
3464 if (abi_version_at_least (2))
3465 propagate_binfo_offsets
3466 (binfo, size_diffop (size_zero_node, BINFO_OFFSET (binfo)));
3468 warning ("offset of empty base %qT may not be ABI-compliant and may"
3469 "change in a future version of GCC",
3470 BINFO_TYPE (binfo));
3473 /* This is an empty base class. We first try to put it at offset
3475 if (layout_conflict_p (binfo,
3476 BINFO_OFFSET (binfo),
3480 /* That didn't work. Now, we move forward from the next
3481 available spot in the class. */
3483 propagate_binfo_offsets (binfo, convert (ssizetype, eoc));
3486 if (!layout_conflict_p (binfo,
3487 BINFO_OFFSET (binfo),
3490 /* We finally found a spot where there's no overlap. */
3493 /* There's overlap here, too. Bump along to the next spot. */
3494 propagate_binfo_offsets (binfo, alignment);
3500 /* Layout the the base given by BINFO in the class indicated by RLI.
3501 *BASE_ALIGN is a running maximum of the alignments of
3502 any base class. OFFSETS gives the location of empty base
3503 subobjects. T is the most derived type. Return nonzero if the new
3504 object cannot be nearly-empty. A new FIELD_DECL is inserted at
3505 *NEXT_FIELD, unless BINFO is for an empty base class.
3507 Returns the location at which the next field should be inserted. */
3510 build_base_field (record_layout_info rli, tree binfo,
3511 splay_tree offsets, tree *next_field)
3514 tree basetype = BINFO_TYPE (binfo);
3516 if (!COMPLETE_TYPE_P (basetype))
3517 /* This error is now reported in xref_tag, thus giving better
3518 location information. */
3521 /* Place the base class. */
3522 if (!is_empty_class (basetype))
3526 /* The containing class is non-empty because it has a non-empty
3528 CLASSTYPE_EMPTY_P (t) = 0;
3530 /* Create the FIELD_DECL. */
3531 decl = build_decl (FIELD_DECL, NULL_TREE, CLASSTYPE_AS_BASE (basetype));
3532 DECL_ARTIFICIAL (decl) = 1;
3533 DECL_FIELD_CONTEXT (decl) = t;
3534 DECL_SIZE (decl) = CLASSTYPE_SIZE (basetype);
3535 DECL_SIZE_UNIT (decl) = CLASSTYPE_SIZE_UNIT (basetype);
3536 DECL_ALIGN (decl) = CLASSTYPE_ALIGN (basetype);
3537 DECL_USER_ALIGN (decl) = CLASSTYPE_USER_ALIGN (basetype);
3538 DECL_MODE (decl) = TYPE_MODE (basetype);
3539 DECL_IGNORED_P (decl) = 1;
3540 DECL_FIELD_IS_BASE (decl) = 1;
3542 /* Try to place the field. It may take more than one try if we
3543 have a hard time placing the field without putting two
3544 objects of the same type at the same address. */
3545 layout_nonempty_base_or_field (rli, decl, binfo, offsets);
3546 /* Add the new FIELD_DECL to the list of fields for T. */
3547 TREE_CHAIN (decl) = *next_field;
3549 next_field = &TREE_CHAIN (decl);
3556 /* On some platforms (ARM), even empty classes will not be
3558 eoc = round_up (rli_size_unit_so_far (rli),
3559 CLASSTYPE_ALIGN_UNIT (basetype));
3560 atend = layout_empty_base (binfo, eoc, offsets);
3561 /* A nearly-empty class "has no proper base class that is empty,
3562 not morally virtual, and at an offset other than zero." */
3563 if (!BINFO_VIRTUAL_P (binfo) && CLASSTYPE_NEARLY_EMPTY_P (t))
3566 CLASSTYPE_NEARLY_EMPTY_P (t) = 0;
3567 /* The check above (used in G++ 3.2) is insufficient because
3568 an empty class placed at offset zero might itself have an
3569 empty base at a nonzero offset. */
3570 else if (walk_subobject_offsets (basetype,
3571 empty_base_at_nonzero_offset_p,
3574 /*max_offset=*/NULL_TREE,
3577 if (abi_version_at_least (2))
3578 CLASSTYPE_NEARLY_EMPTY_P (t) = 0;
3580 warning ("class %qT will be considered nearly empty in a "
3581 "future version of GCC", t);
3585 /* We do not create a FIELD_DECL for empty base classes because
3586 it might overlap some other field. We want to be able to
3587 create CONSTRUCTORs for the class by iterating over the
3588 FIELD_DECLs, and the back end does not handle overlapping
3591 /* An empty virtual base causes a class to be non-empty
3592 -- but in that case we do not need to clear CLASSTYPE_EMPTY_P
3593 here because that was already done when the virtual table
3594 pointer was created. */
3597 /* Record the offsets of BINFO and its base subobjects. */
3598 record_subobject_offsets (binfo,
3599 BINFO_OFFSET (binfo),
3606 /* Layout all of the non-virtual base classes. Record empty
3607 subobjects in OFFSETS. T is the most derived type. Return nonzero
3608 if the type cannot be nearly empty. The fields created
3609 corresponding to the base classes will be inserted at
3613 build_base_fields (record_layout_info rli,
3614 splay_tree offsets, tree *next_field)
3616 /* Chain to hold all the new FIELD_DECLs which stand in for base class
3619 int n_baseclasses = BINFO_N_BASE_BINFOS (TYPE_BINFO (t));
3622 /* The primary base class is always allocated first. */
3623 if (CLASSTYPE_HAS_PRIMARY_BASE_P (t))
3624 next_field = build_base_field (rli, CLASSTYPE_PRIMARY_BINFO (t),
3625 offsets, next_field);
3627 /* Now allocate the rest of the bases. */
3628 for (i = 0; i < n_baseclasses; ++i)
3632 base_binfo = BINFO_BASE_BINFO (TYPE_BINFO (t), i);
3634 /* The primary base was already allocated above, so we don't
3635 need to allocate it again here. */
3636 if (base_binfo == CLASSTYPE_PRIMARY_BINFO (t))
3639 /* Virtual bases are added at the end (a primary virtual base
3640 will have already been added). */
3641 if (BINFO_VIRTUAL_P (base_binfo))
3644 next_field = build_base_field (rli, base_binfo,
3645 offsets, next_field);
3649 /* Go through the TYPE_METHODS of T issuing any appropriate
3650 diagnostics, figuring out which methods override which other
3651 methods, and so forth. */
3654 check_methods (tree t)
3658 for (x = TYPE_METHODS (t); x; x = TREE_CHAIN (x))
3660 check_for_override (x, t);
3661 if (DECL_PURE_VIRTUAL_P (x) && ! DECL_VINDEX (x))
3662 cp_error_at ("initializer specified for non-virtual method %qD", x);
3663 /* The name of the field is the original field name
3664 Save this in auxiliary field for later overloading. */
3665 if (DECL_VINDEX (x))
3667 TYPE_POLYMORPHIC_P (t) = 1;
3668 if (DECL_PURE_VIRTUAL_P (x))
3669 VEC_safe_push (tree, CLASSTYPE_PURE_VIRTUALS (t), x);
3674 /* FN is a constructor or destructor. Clone the declaration to create
3675 a specialized in-charge or not-in-charge version, as indicated by
3679 build_clone (tree fn, tree name)
3684 /* Copy the function. */
3685 clone = copy_decl (fn);
3686 /* Remember where this function came from. */
3687 DECL_CLONED_FUNCTION (clone) = fn;
3688 DECL_ABSTRACT_ORIGIN (clone) = fn;
3689 /* Reset the function name. */
3690 DECL_NAME (clone) = name;
3691 SET_DECL_ASSEMBLER_NAME (clone, NULL_TREE);
3692 /* There's no pending inline data for this function. */
3693 DECL_PENDING_INLINE_INFO (clone) = NULL;
3694 DECL_PENDING_INLINE_P (clone) = 0;
3695 /* And it hasn't yet been deferred. */
3696 DECL_DEFERRED_FN (clone) = 0;
3698 /* The base-class destructor is not virtual. */
3699 if (name == base_dtor_identifier)
3701 DECL_VIRTUAL_P (clone) = 0;
3702 if (TREE_CODE (clone) != TEMPLATE_DECL)
3703 DECL_VINDEX (clone) = NULL_TREE;
3706 /* If there was an in-charge parameter, drop it from the function
3708 if (DECL_HAS_IN_CHARGE_PARM_P (clone))
3714 exceptions = TYPE_RAISES_EXCEPTIONS (TREE_TYPE (clone));
3715 basetype = TYPE_METHOD_BASETYPE (TREE_TYPE (clone));
3716 parmtypes = TYPE_ARG_TYPES (TREE_TYPE (clone));
3717 /* Skip the `this' parameter. */
3718 parmtypes = TREE_CHAIN (parmtypes);
3719 /* Skip the in-charge parameter. */
3720 parmtypes = TREE_CHAIN (parmtypes);
3721 /* And the VTT parm, in a complete [cd]tor. */
3722 if (DECL_HAS_VTT_PARM_P (fn)
3723 && ! DECL_NEEDS_VTT_PARM_P (clone))
3724 parmtypes = TREE_CHAIN (parmtypes);
3725 /* If this is subobject constructor or destructor, add the vtt
3728 = build_method_type_directly (basetype,
3729 TREE_TYPE (TREE_TYPE (clone)),
3732 TREE_TYPE (clone) = build_exception_variant (TREE_TYPE (clone),
3735 = cp_build_type_attribute_variant (TREE_TYPE (clone),
3736 TYPE_ATTRIBUTES (TREE_TYPE (fn)));
3739 /* Copy the function parameters. But, DECL_ARGUMENTS on a TEMPLATE_DECL
3740 aren't function parameters; those are the template parameters. */
3741 if (TREE_CODE (clone) != TEMPLATE_DECL)
3743 DECL_ARGUMENTS (clone) = copy_list (DECL_ARGUMENTS (clone));
3744 /* Remove the in-charge parameter. */
3745 if (DECL_HAS_IN_CHARGE_PARM_P (clone))
3747 TREE_CHAIN (DECL_ARGUMENTS (clone))
3748 = TREE_CHAIN (TREE_CHAIN (DECL_ARGUMENTS (clone)));
3749 DECL_HAS_IN_CHARGE_PARM_P (clone) = 0;
3751 /* And the VTT parm, in a complete [cd]tor. */
3752 if (DECL_HAS_VTT_PARM_P (fn))
3754 if (DECL_NEEDS_VTT_PARM_P (clone))
3755 DECL_HAS_VTT_PARM_P (clone) = 1;
3758 TREE_CHAIN (DECL_ARGUMENTS (clone))
3759 = TREE_CHAIN (TREE_CHAIN (DECL_ARGUMENTS (clone)));
3760 DECL_HAS_VTT_PARM_P (clone) = 0;
3764 for (parms = DECL_ARGUMENTS (clone); parms; parms = TREE_CHAIN (parms))
3766 DECL_CONTEXT (parms) = clone;
3767 cxx_dup_lang_specific_decl (parms);
3771 /* Create the RTL for this function. */
3772 SET_DECL_RTL (clone, NULL_RTX);
3773 rest_of_decl_compilation (clone, /*top_level=*/1, at_eof);
3775 /* Make it easy to find the CLONE given the FN. */
3776 TREE_CHAIN (clone) = TREE_CHAIN (fn);
3777 TREE_CHAIN (fn) = clone;
3779 /* If this is a template, handle the DECL_TEMPLATE_RESULT as well. */
3780 if (TREE_CODE (clone) == TEMPLATE_DECL)
3784 DECL_TEMPLATE_RESULT (clone)
3785 = build_clone (DECL_TEMPLATE_RESULT (clone), name);
3786 result = DECL_TEMPLATE_RESULT (clone);
3787 DECL_TEMPLATE_INFO (result) = copy_node (DECL_TEMPLATE_INFO (result));
3788 DECL_TI_TEMPLATE (result) = clone;
3794 /* Produce declarations for all appropriate clones of FN. If
3795 UPDATE_METHOD_VEC_P is nonzero, the clones are added to the
3796 CLASTYPE_METHOD_VEC as well. */
3799 clone_function_decl (tree fn, int update_method_vec_p)
3803 /* Avoid inappropriate cloning. */
3805 && DECL_CLONED_FUNCTION (TREE_CHAIN (fn)))
3808 if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (fn))
3810 /* For each constructor, we need two variants: an in-charge version
3811 and a not-in-charge version. */
3812 clone = build_clone (fn, complete_ctor_identifier);
3813 if (update_method_vec_p)
3814 add_method (DECL_CONTEXT (clone), clone);
3815 clone = build_clone (fn, base_ctor_identifier);
3816 if (update_method_vec_p)
3817 add_method (DECL_CONTEXT (clone), clone);
3821 gcc_assert (DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P (fn));
3823 /* For each destructor, we need three variants: an in-charge
3824 version, a not-in-charge version, and an in-charge deleting
3825 version. We clone the deleting version first because that
3826 means it will go second on the TYPE_METHODS list -- and that
3827 corresponds to the correct layout order in the virtual
3830 For a non-virtual destructor, we do not build a deleting
3832 if (DECL_VIRTUAL_P (fn))
3834 clone = build_clone (fn, deleting_dtor_identifier);
3835 if (update_method_vec_p)
3836 add_method (DECL_CONTEXT (clone), clone);
3838 clone = build_clone (fn, complete_dtor_identifier);
3839 if (update_method_vec_p)
3840 add_method (DECL_CONTEXT (clone), clone);
3841 clone = build_clone (fn, base_dtor_identifier);
3842 if (update_method_vec_p)
3843 add_method (DECL_CONTEXT (clone), clone);
3846 /* Note that this is an abstract function that is never emitted. */
3847 DECL_ABSTRACT (fn) = 1;
3850 /* DECL is an in charge constructor, which is being defined. This will
3851 have had an in class declaration, from whence clones were
3852 declared. An out-of-class definition can specify additional default
3853 arguments. As it is the clones that are involved in overload
3854 resolution, we must propagate the information from the DECL to its
3858 adjust_clone_args (tree decl)
3862 for (clone = TREE_CHAIN (decl); clone && DECL_CLONED_FUNCTION (clone);
3863 clone = TREE_CHAIN (clone))
3865 tree orig_clone_parms = TYPE_ARG_TYPES (TREE_TYPE (clone));
3866 tree orig_decl_parms = TYPE_ARG_TYPES (TREE_TYPE (decl));
3867 tree decl_parms, clone_parms;
3869 clone_parms = orig_clone_parms;
3871 /* Skip the 'this' parameter. */
3872 orig_clone_parms = TREE_CHAIN (orig_clone_parms);
3873 orig_decl_parms = TREE_CHAIN (orig_decl_parms);
3875 if (DECL_HAS_IN_CHARGE_PARM_P (decl))
3876 orig_decl_parms = TREE_CHAIN (orig_decl_parms);
3877 if (DECL_HAS_VTT_PARM_P (decl))
3878 orig_decl_parms = TREE_CHAIN (orig_decl_parms);
3880 clone_parms = orig_clone_parms;
3881 if (DECL_HAS_VTT_PARM_P (clone))
3882 clone_parms = TREE_CHAIN (clone_parms);
3884 for (decl_parms = orig_decl_parms; decl_parms;
3885 decl_parms = TREE_CHAIN (decl_parms),
3886 clone_parms = TREE_CHAIN (clone_parms))
3888 gcc_assert (same_type_p (TREE_TYPE (decl_parms),
3889 TREE_TYPE (clone_parms)));
3891 if (TREE_PURPOSE (decl_parms) && !TREE_PURPOSE (clone_parms))
3893 /* A default parameter has been added. Adjust the
3894 clone's parameters. */
3895 tree exceptions = TYPE_RAISES_EXCEPTIONS (TREE_TYPE (clone));
3896 tree basetype = TYPE_METHOD_BASETYPE (TREE_TYPE (clone));
3899 clone_parms = orig_decl_parms;
3901 if (DECL_HAS_VTT_PARM_P (clone))
3903 clone_parms = tree_cons (TREE_PURPOSE (orig_clone_parms),
3904 TREE_VALUE (orig_clone_parms),
3906 TREE_TYPE (clone_parms) = TREE_TYPE (orig_clone_parms);
3908 type = build_method_type_directly (basetype,
3909 TREE_TYPE (TREE_TYPE (clone)),
3912 type = build_exception_variant (type, exceptions);
3913 TREE_TYPE (clone) = type;
3915 clone_parms = NULL_TREE;
3919 gcc_assert (!clone_parms);
3923 /* For each of the constructors and destructors in T, create an
3924 in-charge and not-in-charge variant. */
3927 clone_constructors_and_destructors (tree t)
3931 /* If for some reason we don't have a CLASSTYPE_METHOD_VEC, we bail
3933 if (!CLASSTYPE_METHOD_VEC (t))
3936 for (fns = CLASSTYPE_CONSTRUCTORS (t); fns; fns = OVL_NEXT (fns))
3937 clone_function_decl (OVL_CURRENT (fns), /*update_method_vec_p=*/1);
3938 for (fns = CLASSTYPE_DESTRUCTORS (t); fns; fns = OVL_NEXT (fns))
3939 clone_function_decl (OVL_CURRENT (fns), /*update_method_vec_p=*/1);
3942 /* Remove all zero-width bit-fields from T. */
3945 remove_zero_width_bit_fields (tree t)
3949 fieldsp = &TYPE_FIELDS (t);
3952 if (TREE_CODE (*fieldsp) == FIELD_DECL
3953 && DECL_C_BIT_FIELD (*fieldsp)
3954 && DECL_INITIAL (*fieldsp))
3955 *fieldsp = TREE_CHAIN (*fieldsp);
3957 fieldsp = &TREE_CHAIN (*fieldsp);
3961 /* Returns TRUE iff we need a cookie when dynamically allocating an
3962 array whose elements have the indicated class TYPE. */
3965 type_requires_array_cookie (tree type)
3968 bool has_two_argument_delete_p = false;
3970 gcc_assert (CLASS_TYPE_P (type));
3972 /* If there's a non-trivial destructor, we need a cookie. In order
3973 to iterate through the array calling the destructor for each
3974 element, we'll have to know how many elements there are. */
3975 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type))
3978 /* If the usual deallocation function is a two-argument whose second
3979 argument is of type `size_t', then we have to pass the size of
3980 the array to the deallocation function, so we will need to store
3982 fns = lookup_fnfields (TYPE_BINFO (type),
3983 ansi_opname (VEC_DELETE_EXPR),
3985 /* If there are no `operator []' members, or the lookup is
3986 ambiguous, then we don't need a cookie. */
3987 if (!fns || fns == error_mark_node)
3989 /* Loop through all of the functions. */
3990 for (fns = BASELINK_FUNCTIONS (fns); fns; fns = OVL_NEXT (fns))
3995 /* Select the current function. */
3996 fn = OVL_CURRENT (fns);
3997 /* See if this function is a one-argument delete function. If
3998 it is, then it will be the usual deallocation function. */
3999 second_parm = TREE_CHAIN (TYPE_ARG_TYPES (TREE_TYPE (fn)));
4000 if (second_parm == void_list_node)
4002 /* Otherwise, if we have a two-argument function and the second
4003 argument is `size_t', it will be the usual deallocation
4004 function -- unless there is one-argument function, too. */
4005 if (TREE_CHAIN (second_parm) == void_list_node
4006 && same_type_p (TREE_VALUE (second_parm), sizetype))
4007 has_two_argument_delete_p = true;
4010 return has_two_argument_delete_p;
4013 /* Check the validity of the bases and members declared in T. Add any
4014 implicitly-generated functions (like copy-constructors and
4015 assignment operators). Compute various flag bits (like
4016 CLASSTYPE_NON_POD_T) for T. This routine works purely at the C++
4017 level: i.e., independently of the ABI in use. */
4020 check_bases_and_members (tree t)
4022 /* Nonzero if we are not allowed to generate a default constructor
4024 int cant_have_default_ctor;
4025 /* Nonzero if the implicitly generated copy constructor should take
4026 a non-const reference argument. */
4027 int cant_have_const_ctor;
4028 /* Nonzero if the the implicitly generated assignment operator
4029 should take a non-const reference argument. */
4030 int no_const_asn_ref;
4033 /* By default, we use const reference arguments and generate default
4035 cant_have_default_ctor = 0;
4036 cant_have_const_ctor = 0;
4037 no_const_asn_ref = 0;
4039 /* Check all the base-classes. */
4040 check_bases (t, &cant_have_default_ctor, &cant_have_const_ctor,
4043 /* Check all the data member declarations. */
4044 check_field_decls (t, &access_decls,
4045 &cant_have_default_ctor,
4046 &cant_have_const_ctor,
4049 /* Check all the method declarations. */
4052 /* A nearly-empty class has to be vptr-containing; a nearly empty
4053 class contains just a vptr. */
4054 if (!TYPE_CONTAINS_VPTR_P (t))
4055 CLASSTYPE_NEARLY_EMPTY_P (t) = 0;
4057 /* Do some bookkeeping that will guide the generation of implicitly
4058 declared member functions. */
4059 TYPE_HAS_COMPLEX_INIT_REF (t)
4060 |= (TYPE_HAS_INIT_REF (t) || TYPE_CONTAINS_VPTR_P (t));
4061 TYPE_NEEDS_CONSTRUCTING (t)
4062 |= (TYPE_HAS_CONSTRUCTOR (t) || TYPE_CONTAINS_VPTR_P (t));
4063 CLASSTYPE_NON_AGGREGATE (t)
4064 |= (TYPE_HAS_CONSTRUCTOR (t) || TYPE_POLYMORPHIC_P (t));
4065 CLASSTYPE_NON_POD_P (t)
4066 |= (CLASSTYPE_NON_AGGREGATE (t) || TYPE_HAS_DESTRUCTOR (t)
4067 || TYPE_HAS_ASSIGN_REF (t));
4068 TYPE_HAS_COMPLEX_ASSIGN_REF (t)
4069 |= TYPE_HAS_ASSIGN_REF (t) || TYPE_CONTAINS_VPTR_P (t);
4071 /* Synthesize any needed methods. */
4072 add_implicitly_declared_members (t, cant_have_default_ctor,
4073 cant_have_const_ctor,
4076 /* Create the in-charge and not-in-charge variants of constructors
4078 clone_constructors_and_destructors (t);
4080 /* Process the using-declarations. */
4081 for (; access_decls; access_decls = TREE_CHAIN (access_decls))
4082 handle_using_decl (TREE_VALUE (access_decls), t);
4084 /* Build and sort the CLASSTYPE_METHOD_VEC. */
4085 finish_struct_methods (t);
4087 /* Figure out whether or not we will need a cookie when dynamically
4088 allocating an array of this type. */
4089 TYPE_LANG_SPECIFIC (t)->u.c.vec_new_uses_cookie
4090 = type_requires_array_cookie (t);
4093 /* If T needs a pointer to its virtual function table, set TYPE_VFIELD
4094 accordingly. If a new vfield was created (because T doesn't have a
4095 primary base class), then the newly created field is returned. It
4096 is not added to the TYPE_FIELDS list; it is the caller's
4097 responsibility to do that. Accumulate declared virtual functions
4101 create_vtable_ptr (tree t, tree* virtuals_p)
4105 /* Collect the virtual functions declared in T. */
4106 for (fn = TYPE_METHODS (t); fn; fn = TREE_CHAIN (fn))
4107 if (DECL_VINDEX (fn) && !DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P (fn)
4108 && TREE_CODE (DECL_VINDEX (fn)) != INTEGER_CST)
4110 tree new_virtual = make_node (TREE_LIST);
4112 BV_FN (new_virtual) = fn;
4113 BV_DELTA (new_virtual) = integer_zero_node;
4114 BV_VCALL_INDEX (new_virtual) = NULL_TREE;
4116 TREE_CHAIN (new_virtual) = *virtuals_p;
4117 *virtuals_p = new_virtual;
4120 /* If we couldn't find an appropriate base class, create a new field
4121 here. Even if there weren't any new virtual functions, we might need a
4122 new virtual function table if we're supposed to include vptrs in
4123 all classes that need them. */
4124 if (!TYPE_VFIELD (t) && (*virtuals_p || TYPE_CONTAINS_VPTR_P (t)))
4126 /* We build this decl with vtbl_ptr_type_node, which is a
4127 `vtable_entry_type*'. It might seem more precise to use
4128 `vtable_entry_type (*)[N]' where N is the number of virtual
4129 functions. However, that would require the vtable pointer in
4130 base classes to have a different type than the vtable pointer
4131 in derived classes. We could make that happen, but that
4132 still wouldn't solve all the problems. In particular, the
4133 type-based alias analysis code would decide that assignments
4134 to the base class vtable pointer can't alias assignments to
4135 the derived class vtable pointer, since they have different
4136 types. Thus, in a derived class destructor, where the base
4137 class constructor was inlined, we could generate bad code for
4138 setting up the vtable pointer.
4140 Therefore, we use one type for all vtable pointers. We still
4141 use a type-correct type; it's just doesn't indicate the array
4142 bounds. That's better than using `void*' or some such; it's
4143 cleaner, and it let's the alias analysis code know that these
4144 stores cannot alias stores to void*! */
4147 field = build_decl (FIELD_DECL, get_vfield_name (t), vtbl_ptr_type_node);
4148 SET_DECL_ASSEMBLER_NAME (field, get_identifier (VFIELD_BASE));
4149 DECL_VIRTUAL_P (field) = 1;
4150 DECL_ARTIFICIAL (field) = 1;
4151 DECL_FIELD_CONTEXT (field) = t;
4152 DECL_FCONTEXT (field) = t;
4154 TYPE_VFIELD (t) = field;
4156 /* This class is non-empty. */
4157 CLASSTYPE_EMPTY_P (t) = 0;
4165 /* Fixup the inline function given by INFO now that the class is
4169 fixup_pending_inline (tree fn)
4171 if (DECL_PENDING_INLINE_INFO (fn))
4173 tree args = DECL_ARGUMENTS (fn);
4176 DECL_CONTEXT (args) = fn;
4177 args = TREE_CHAIN (args);
4182 /* Fixup the inline methods and friends in TYPE now that TYPE is
4186 fixup_inline_methods (tree type)
4188 tree method = TYPE_METHODS (type);
4189 VEC (tree) *friends;
4192 if (method && TREE_CODE (method) == TREE_VEC)
4194 if (TREE_VEC_ELT (method, 1))
4195 method = TREE_VEC_ELT (method, 1);
4196 else if (TREE_VEC_ELT (method, 0))
4197 method = TREE_VEC_ELT (method, 0);
4199 method = TREE_VEC_ELT (method, 2);
4202 /* Do inline member functions. */
4203 for (; method; method = TREE_CHAIN (method))
4204 fixup_pending_inline (method);
4207 for (friends = CLASSTYPE_INLINE_FRIENDS (type), ix = 0;
4208 VEC_iterate (tree, friends, ix, method); ix++)
4209 fixup_pending_inline (method);
4210 CLASSTYPE_INLINE_FRIENDS (type) = NULL;
4213 /* Add OFFSET to all base types of BINFO which is a base in the
4214 hierarchy dominated by T.
4216 OFFSET, which is a type offset, is number of bytes. */
4219 propagate_binfo_offsets (tree binfo, tree offset)
4225 /* Update BINFO's offset. */
4226 BINFO_OFFSET (binfo)
4227 = convert (sizetype,
4228 size_binop (PLUS_EXPR,
4229 convert (ssizetype, BINFO_OFFSET (binfo)),
4232 /* Find the primary base class. */
4233 primary_binfo = get_primary_binfo (binfo);
4235 if (primary_binfo && BINFO_INHERITANCE_CHAIN (primary_binfo) == binfo)
4236 propagate_binfo_offsets (primary_binfo, offset);
4238 /* Scan all of the bases, pushing the BINFO_OFFSET adjust
4240 for (i = 0; BINFO_BASE_ITERATE (binfo, i, base_binfo); ++i)
4242 /* Don't do the primary base twice. */
4243 if (base_binfo == primary_binfo)
4246 if (BINFO_VIRTUAL_P (base_binfo))
4249 propagate_binfo_offsets (base_binfo, offset);
4253 /* Set BINFO_OFFSET for all of the virtual bases for RLI->T. Update
4254 TYPE_ALIGN and TYPE_SIZE for T. OFFSETS gives the location of
4255 empty subobjects of T. */
4258 layout_virtual_bases (record_layout_info rli, splay_tree offsets)
4262 bool first_vbase = true;
4265 if (BINFO_N_BASE_BINFOS (TYPE_BINFO (t)) == 0)
4268 if (!abi_version_at_least(2))
4270 /* In G++ 3.2, we incorrectly rounded the size before laying out
4271 the virtual bases. */
4272 finish_record_layout (rli, /*free_p=*/false);
4273 #ifdef STRUCTURE_SIZE_BOUNDARY
4274 /* Packed structures don't need to have minimum size. */
4275 if (! TYPE_PACKED (t))
4276 TYPE_ALIGN (t) = MAX (TYPE_ALIGN (t), (unsigned) STRUCTURE_SIZE_BOUNDARY);
4278 rli->offset = TYPE_SIZE_UNIT (t);
4279 rli->bitpos = bitsize_zero_node;
4280 rli->record_align = TYPE_ALIGN (t);
4283 /* Find the last field. The artificial fields created for virtual
4284 bases will go after the last extant field to date. */
4285 next_field = &TYPE_FIELDS (t);
4287 next_field = &TREE_CHAIN (*next_field);
4289 /* Go through the virtual bases, allocating space for each virtual
4290 base that is not already a primary base class. These are
4291 allocated in inheritance graph order. */
4292 for (vbase = TYPE_BINFO (t); vbase; vbase = TREE_CHAIN (vbase))
4294 if (!BINFO_VIRTUAL_P (vbase))
4297 if (!BINFO_PRIMARY_P (vbase))
4299 tree basetype = TREE_TYPE (vbase);
4301 /* This virtual base is not a primary base of any class in the
4302 hierarchy, so we have to add space for it. */
4303 next_field = build_base_field (rli, vbase,
4304 offsets, next_field);
4306 /* If the first virtual base might have been placed at a
4307 lower address, had we started from CLASSTYPE_SIZE, rather
4308 than TYPE_SIZE, issue a warning. There can be both false
4309 positives and false negatives from this warning in rare
4310 cases; to deal with all the possibilities would probably
4311 require performing both layout algorithms and comparing
4312 the results which is not particularly tractable. */
4316 (size_binop (CEIL_DIV_EXPR,
4317 round_up (CLASSTYPE_SIZE (t),
4318 CLASSTYPE_ALIGN (basetype)),
4320 BINFO_OFFSET (vbase))))
4321 warning ("offset of virtual base %qT is not ABI-compliant and "
4322 "may change in a future version of GCC",
4325 first_vbase = false;
4330 /* Returns the offset of the byte just past the end of the base class
4334 end_of_base (tree binfo)
4338 if (is_empty_class (BINFO_TYPE (binfo)))
4339 /* An empty class has zero CLASSTYPE_SIZE_UNIT, but we need to
4340 allocate some space for it. It cannot have virtual bases, so
4341 TYPE_SIZE_UNIT is fine. */
4342 size = TYPE_SIZE_UNIT (BINFO_TYPE (binfo));
4344 size = CLASSTYPE_SIZE_UNIT (BINFO_TYPE (binfo));
4346 return size_binop (PLUS_EXPR, BINFO_OFFSET (binfo), size);
4349 /* Returns the offset of the byte just past the end of the base class
4350 with the highest offset in T. If INCLUDE_VIRTUALS_P is zero, then
4351 only non-virtual bases are included. */
4354 end_of_class (tree t, int include_virtuals_p)
4356 tree result = size_zero_node;
4363 for (binfo = TYPE_BINFO (t), i = 0;
4364 BINFO_BASE_ITERATE (binfo, i, base_binfo); ++i)
4366 if (!include_virtuals_p
4367 && BINFO_VIRTUAL_P (base_binfo)
4368 && (!BINFO_PRIMARY_P (base_binfo)
4369 || BINFO_INHERITANCE_CHAIN (base_binfo) != TYPE_BINFO (t)))
4372 offset = end_of_base (base_binfo);
4373 if (INT_CST_LT_UNSIGNED (result, offset))
4377 /* G++ 3.2 did not check indirect virtual bases. */
4378 if (abi_version_at_least (2) && include_virtuals_p)
4379 for (vbases = CLASSTYPE_VBASECLASSES (t), i = 0;
4380 VEC_iterate (tree, vbases, i, base_binfo); i++)
4382 offset = end_of_base (base_binfo);
4383 if (INT_CST_LT_UNSIGNED (result, offset))
4390 /* Warn about bases of T that are inaccessible because they are
4391 ambiguous. For example:
4394 struct T : public S {};
4395 struct U : public S, public T {};
4397 Here, `(S*) new U' is not allowed because there are two `S'
4401 warn_about_ambiguous_bases (tree t)
4409 /* If there are no repeated bases, nothing can be ambiguous. */
4410 if (!CLASSTYPE_REPEATED_BASE_P (t))
4413 /* Check direct bases. */
4414 for (binfo = TYPE_BINFO (t), i = 0;
4415 BINFO_BASE_ITERATE (binfo, i, base_binfo); ++i)
4417 basetype = BINFO_TYPE (base_binfo);
4419 if (!lookup_base (t, basetype, ba_unique | ba_quiet, NULL))
4420 warning ("direct base %qT inaccessible in %qT due to ambiguity",
4424 /* Check for ambiguous virtual bases. */
4426 for (vbases = CLASSTYPE_VBASECLASSES (t), i = 0;
4427 VEC_iterate (tree, vbases, i, binfo); i++)
4429 basetype = BINFO_TYPE (binfo);
4431 if (!lookup_base (t, basetype, ba_unique | ba_quiet, NULL))
4432 warning ("virtual base %qT inaccessible in %qT due to ambiguity",
4437 /* Compare two INTEGER_CSTs K1 and K2. */
4440 splay_tree_compare_integer_csts (splay_tree_key k1, splay_tree_key k2)
4442 return tree_int_cst_compare ((tree) k1, (tree) k2);
4445 /* Increase the size indicated in RLI to account for empty classes
4446 that are "off the end" of the class. */
4449 include_empty_classes (record_layout_info rli)
4454 /* It might be the case that we grew the class to allocate a
4455 zero-sized base class. That won't be reflected in RLI, yet,
4456 because we are willing to overlay multiple bases at the same
4457 offset. However, now we need to make sure that RLI is big enough
4458 to reflect the entire class. */
4459 eoc = end_of_class (rli->t,
4460 CLASSTYPE_AS_BASE (rli->t) != NULL_TREE);
4461 rli_size = rli_size_unit_so_far (rli);
4462 if (TREE_CODE (rli_size) == INTEGER_CST
4463 && INT_CST_LT_UNSIGNED (rli_size, eoc))
4465 if (!abi_version_at_least (2))
4466 /* In version 1 of the ABI, the size of a class that ends with
4467 a bitfield was not rounded up to a whole multiple of a
4468 byte. Because rli_size_unit_so_far returns only the number
4469 of fully allocated bytes, any extra bits were not included
4471 rli->bitpos = round_down (rli->bitpos, BITS_PER_UNIT);
4473 /* The size should have been rounded to a whole byte. */
4474 gcc_assert (tree_int_cst_equal
4475 (rli->bitpos, round_down (rli->bitpos, BITS_PER_UNIT)));
4477 = size_binop (PLUS_EXPR,
4479 size_binop (MULT_EXPR,
4480 convert (bitsizetype,
4481 size_binop (MINUS_EXPR,
4483 bitsize_int (BITS_PER_UNIT)));
4484 normalize_rli (rli);
4488 /* Calculate the TYPE_SIZE, TYPE_ALIGN, etc for T. Calculate
4489 BINFO_OFFSETs for all of the base-classes. Position the vtable
4490 pointer. Accumulate declared virtual functions on VIRTUALS_P. */
4493 layout_class_type (tree t, tree *virtuals_p)
4495 tree non_static_data_members;
4498 record_layout_info rli;
4499 /* Maps offsets (represented as INTEGER_CSTs) to a TREE_LIST of
4500 types that appear at that offset. */
4501 splay_tree empty_base_offsets;
4502 /* True if the last field layed out was a bit-field. */
4503 bool last_field_was_bitfield = false;
4504 /* The location at which the next field should be inserted. */
4506 /* T, as a base class. */
4509 /* Keep track of the first non-static data member. */
4510 non_static_data_members = TYPE_FIELDS (t);
4512 /* Start laying out the record. */
4513 rli = start_record_layout (t);
4515 /* Mark all the primary bases in the hierarchy. */
4516 determine_primary_bases (t);
4518 /* Create a pointer to our virtual function table. */
4519 vptr = create_vtable_ptr (t, virtuals_p);
4521 /* The vptr is always the first thing in the class. */
4524 TREE_CHAIN (vptr) = TYPE_FIELDS (t);
4525 TYPE_FIELDS (t) = vptr;
4526 next_field = &TREE_CHAIN (vptr);
4527 place_field (rli, vptr);
4530 next_field = &TYPE_FIELDS (t);
4532 /* Build FIELD_DECLs for all of the non-virtual base-types. */
4533 empty_base_offsets = splay_tree_new (splay_tree_compare_integer_csts,
4535 build_base_fields (rli, empty_base_offsets, next_field);
4537 /* Layout the non-static data members. */
4538 for (field = non_static_data_members; field; field = TREE_CHAIN (field))
4543 /* We still pass things that aren't non-static data members to
4544 the back-end, in case it wants to do something with them. */
4545 if (TREE_CODE (field) != FIELD_DECL)
4547 place_field (rli, field);
4548 /* If the static data member has incomplete type, keep track
4549 of it so that it can be completed later. (The handling
4550 of pending statics in finish_record_layout is
4551 insufficient; consider:
4554 struct S2 { static S1 s1; };
4556 At this point, finish_record_layout will be called, but
4557 S1 is still incomplete.) */
4558 if (TREE_CODE (field) == VAR_DECL)
4559 maybe_register_incomplete_var (field);
4563 type = TREE_TYPE (field);
4565 padding = NULL_TREE;
4567 /* If this field is a bit-field whose width is greater than its
4568 type, then there are some special rules for allocating
4570 if (DECL_C_BIT_FIELD (field)
4571 && INT_CST_LT (TYPE_SIZE (type), DECL_SIZE (field)))
4573 integer_type_kind itk;
4575 bool was_unnamed_p = false;
4576 /* We must allocate the bits as if suitably aligned for the
4577 longest integer type that fits in this many bits. type
4578 of the field. Then, we are supposed to use the left over
4579 bits as additional padding. */
4580 for (itk = itk_char; itk != itk_none; ++itk)
4581 if (INT_CST_LT (DECL_SIZE (field),
4582 TYPE_SIZE (integer_types[itk])))
4585 /* ITK now indicates a type that is too large for the
4586 field. We have to back up by one to find the largest
4588 integer_type = integer_types[itk - 1];
4590 /* Figure out how much additional padding is required. GCC
4591 3.2 always created a padding field, even if it had zero
4593 if (!abi_version_at_least (2)
4594 || INT_CST_LT (TYPE_SIZE (integer_type), DECL_SIZE (field)))
4596 if (abi_version_at_least (2) && TREE_CODE (t) == UNION_TYPE)
4597 /* In a union, the padding field must have the full width
4598 of the bit-field; all fields start at offset zero. */
4599 padding = DECL_SIZE (field);
4602 if (warn_abi && TREE_CODE (t) == UNION_TYPE)
4603 warning ("size assigned to %qT may not be "
4604 "ABI-compliant and may change in a future "
4607 padding = size_binop (MINUS_EXPR, DECL_SIZE (field),
4608 TYPE_SIZE (integer_type));
4611 #ifdef PCC_BITFIELD_TYPE_MATTERS
4612 /* An unnamed bitfield does not normally affect the
4613 alignment of the containing class on a target where
4614 PCC_BITFIELD_TYPE_MATTERS. But, the C++ ABI does not
4615 make any exceptions for unnamed bitfields when the
4616 bitfields are longer than their types. Therefore, we
4617 temporarily give the field a name. */
4618 if (PCC_BITFIELD_TYPE_MATTERS && !DECL_NAME (field))
4620 was_unnamed_p = true;
4621 DECL_NAME (field) = make_anon_name ();
4624 DECL_SIZE (field) = TYPE_SIZE (integer_type);
4625 DECL_ALIGN (field) = TYPE_ALIGN (integer_type);
4626 DECL_USER_ALIGN (field) = TYPE_USER_ALIGN (integer_type);
4627 layout_nonempty_base_or_field (rli, field, NULL_TREE,
4628 empty_base_offsets);
4630 DECL_NAME (field) = NULL_TREE;
4631 /* Now that layout has been performed, set the size of the
4632 field to the size of its declared type; the rest of the
4633 field is effectively invisible. */
4634 DECL_SIZE (field) = TYPE_SIZE (type);
4635 /* We must also reset the DECL_MODE of the field. */
4636 if (abi_version_at_least (2))
4637 DECL_MODE (field) = TYPE_MODE (type);
4639 && DECL_MODE (field) != TYPE_MODE (type))
4640 /* Versions of G++ before G++ 3.4 did not reset the
4642 warning ("the offset of %qD may not be ABI-compliant and may "
4643 "change in a future version of GCC", field);
4646 layout_nonempty_base_or_field (rli, field, NULL_TREE,
4647 empty_base_offsets);
4649 /* Remember the location of any empty classes in FIELD. */
4650 if (abi_version_at_least (2))
4651 record_subobject_offsets (TREE_TYPE (field),
4652 byte_position(field),
4656 /* If a bit-field does not immediately follow another bit-field,
4657 and yet it starts in the middle of a byte, we have failed to
4658 comply with the ABI. */
4660 && DECL_C_BIT_FIELD (field)
4661 && !last_field_was_bitfield
4662 && !integer_zerop (size_binop (TRUNC_MOD_EXPR,
4663 DECL_FIELD_BIT_OFFSET (field),
4664 bitsize_unit_node)))
4665 cp_warning_at ("offset of %qD is not ABI-compliant and may "
4666 "change in a future version of GCC",
4669 /* G++ used to use DECL_FIELD_OFFSET as if it were the byte
4670 offset of the field. */
4672 && !tree_int_cst_equal (DECL_FIELD_OFFSET (field),
4673 byte_position (field))
4674 && contains_empty_class_p (TREE_TYPE (field)))
4675 cp_warning_at ("%qD contains empty classes which may cause base "
4676 "classes to be placed at different locations in a "
4677 "future version of GCC",
4680 /* If we needed additional padding after this field, add it
4686 padding_field = build_decl (FIELD_DECL,
4689 DECL_BIT_FIELD (padding_field) = 1;
4690 DECL_SIZE (padding_field) = padding;
4691 DECL_CONTEXT (padding_field) = t;
4692 DECL_ARTIFICIAL (padding_field) = 1;
4693 layout_nonempty_base_or_field (rli, padding_field,
4695 empty_base_offsets);
4698 last_field_was_bitfield = DECL_C_BIT_FIELD (field);
4701 if (abi_version_at_least (2) && !integer_zerop (rli->bitpos))
4703 /* Make sure that we are on a byte boundary so that the size of
4704 the class without virtual bases will always be a round number
4706 rli->bitpos = round_up (rli->bitpos, BITS_PER_UNIT);
4707 normalize_rli (rli);
4710 /* G++ 3.2 does not allow virtual bases to be overlaid with tail
4712 if (!abi_version_at_least (2))
4713 include_empty_classes(rli);
4715 /* Delete all zero-width bit-fields from the list of fields. Now
4716 that the type is laid out they are no longer important. */
4717 remove_zero_width_bit_fields (t);
4719 /* Create the version of T used for virtual bases. We do not use
4720 make_aggr_type for this version; this is an artificial type. For
4721 a POD type, we just reuse T. */
4722 if (CLASSTYPE_NON_POD_P (t) || CLASSTYPE_EMPTY_P (t))
4724 base_t = make_node (TREE_CODE (t));
4726 /* Set the size and alignment for the new type. In G++ 3.2, all
4727 empty classes were considered to have size zero when used as
4729 if (!abi_version_at_least (2) && CLASSTYPE_EMPTY_P (t))
4731 TYPE_SIZE (base_t) = bitsize_zero_node;
4732 TYPE_SIZE_UNIT (base_t) = size_zero_node;
4733 if (warn_abi && !integer_zerop (rli_size_unit_so_far (rli)))
4734 warning ("layout of classes derived from empty class %qT "
4735 "may change in a future version of GCC",
4742 /* If the ABI version is not at least two, and the last
4743 field was a bit-field, RLI may not be on a byte
4744 boundary. In particular, rli_size_unit_so_far might
4745 indicate the last complete byte, while rli_size_so_far
4746 indicates the total number of bits used. Therefore,
4747 rli_size_so_far, rather than rli_size_unit_so_far, is
4748 used to compute TYPE_SIZE_UNIT. */
4749 eoc = end_of_class (t, /*include_virtuals_p=*/0);
4750 TYPE_SIZE_UNIT (base_t)
4751 = size_binop (MAX_EXPR,
4753 size_binop (CEIL_DIV_EXPR,
4754 rli_size_so_far (rli),
4755 bitsize_int (BITS_PER_UNIT))),
4758 = size_binop (MAX_EXPR,
4759 rli_size_so_far (rli),
4760 size_binop (MULT_EXPR,
4761 convert (bitsizetype, eoc),
4762 bitsize_int (BITS_PER_UNIT)));
4764 TYPE_ALIGN (base_t) = rli->record_align;
4765 TYPE_USER_ALIGN (base_t) = TYPE_USER_ALIGN (t);
4767 /* Copy the fields from T. */
4768 next_field = &TYPE_FIELDS (base_t);
4769 for (field = TYPE_FIELDS (t); field; field = TREE_CHAIN (field))
4770 if (TREE_CODE (field) == FIELD_DECL)
4772 *next_field = build_decl (FIELD_DECL,
4775 DECL_CONTEXT (*next_field) = base_t;
4776 DECL_FIELD_OFFSET (*next_field) = DECL_FIELD_OFFSET (field);
4777 DECL_FIELD_BIT_OFFSET (*next_field)
4778 = DECL_FIELD_BIT_OFFSET (field);
4779 DECL_SIZE (*next_field) = DECL_SIZE (field);
4780 DECL_MODE (*next_field) = DECL_MODE (field);
4781 next_field = &TREE_CHAIN (*next_field);
4784 /* Record the base version of the type. */
4785 CLASSTYPE_AS_BASE (t) = base_t;
4786 TYPE_CONTEXT (base_t) = t;
4789 CLASSTYPE_AS_BASE (t) = t;
4791 /* Every empty class contains an empty class. */
4792 if (CLASSTYPE_EMPTY_P (t))
4793 CLASSTYPE_CONTAINS_EMPTY_CLASS_P (t) = 1;
4795 /* Set the TYPE_DECL for this type to contain the right
4796 value for DECL_OFFSET, so that we can use it as part
4797 of a COMPONENT_REF for multiple inheritance. */
4798 layout_decl (TYPE_MAIN_DECL (t), 0);
4800 /* Now fix up any virtual base class types that we left lying
4801 around. We must get these done before we try to lay out the
4802 virtual function table. As a side-effect, this will remove the
4803 base subobject fields. */
4804 layout_virtual_bases (rli, empty_base_offsets);
4806 /* Make sure that empty classes are reflected in RLI at this
4808 include_empty_classes(rli);
4810 /* Make sure not to create any structures with zero size. */
4811 if (integer_zerop (rli_size_unit_so_far (rli)) && CLASSTYPE_EMPTY_P (t))
4813 build_decl (FIELD_DECL, NULL_TREE, char_type_node));
4815 /* Let the back-end lay out the type. */
4816 finish_record_layout (rli, /*free_p=*/true);
4818 /* Warn about bases that can't be talked about due to ambiguity. */
4819 warn_about_ambiguous_bases (t);
4821 /* Now that we're done with layout, give the base fields the real types. */
4822 for (field = TYPE_FIELDS (t); field; field = TREE_CHAIN (field))
4823 if (DECL_ARTIFICIAL (field) && IS_FAKE_BASE_TYPE (TREE_TYPE (field)))
4824 TREE_TYPE (field) = TYPE_CONTEXT (TREE_TYPE (field));
4827 splay_tree_delete (empty_base_offsets);
4830 /* Determine the "key method" for the class type indicated by TYPE,
4831 and set CLASSTYPE_KEY_METHOD accordingly. */
4834 determine_key_method (tree type)
4838 if (TYPE_FOR_JAVA (type)
4839 || processing_template_decl
4840 || CLASSTYPE_TEMPLATE_INSTANTIATION (type)
4841 || CLASSTYPE_INTERFACE_KNOWN (type))
4844 /* The key method is the first non-pure virtual function that is not
4845 inline at the point of class definition. On some targets the
4846 key function may not be inline; those targets should not call
4847 this function until the end of the translation unit. */
4848 for (method = TYPE_METHODS (type); method != NULL_TREE;
4849 method = TREE_CHAIN (method))
4850 if (DECL_VINDEX (method) != NULL_TREE
4851 && ! DECL_DECLARED_INLINE_P (method)
4852 && ! DECL_PURE_VIRTUAL_P (method))
4854 CLASSTYPE_KEY_METHOD (type) = method;
4861 /* Perform processing required when the definition of T (a class type)
4865 finish_struct_1 (tree t)
4868 /* A TREE_LIST. The TREE_VALUE of each node is a FUNCTION_DECL. */
4869 tree virtuals = NULL_TREE;
4872 if (COMPLETE_TYPE_P (t))
4874 gcc_assert (IS_AGGR_TYPE (t));
4875 error ("redefinition of %q#T", t);
4880 /* If this type was previously laid out as a forward reference,
4881 make sure we lay it out again. */
4882 TYPE_SIZE (t) = NULL_TREE;
4883 CLASSTYPE_PRIMARY_BINFO (t) = NULL_TREE;
4885 fixup_inline_methods (t);
4887 /* Make assumptions about the class; we'll reset the flags if
4889 CLASSTYPE_EMPTY_P (t) = 1;
4890 CLASSTYPE_NEARLY_EMPTY_P (t) = 1;
4891 CLASSTYPE_CONTAINS_EMPTY_CLASS_P (t) = 0;
4893 /* Do end-of-class semantic processing: checking the validity of the
4894 bases and members and add implicitly generated methods. */
4895 check_bases_and_members (t);
4897 /* Find the key method. */
4898 if (TYPE_CONTAINS_VPTR_P (t))
4900 /* The Itanium C++ ABI permits the key method to be chosen when
4901 the class is defined -- even though the key method so
4902 selected may later turn out to be an inline function. On
4903 some systems (such as ARM Symbian OS) the key method cannot
4904 be determined until the end of the translation unit. On such
4905 systems, we leave CLASSTYPE_KEY_METHOD set to NULL, which
4906 will cause the class to be added to KEYED_CLASSES. Then, in
4907 finish_file we will determine the key method. */
4908 if (targetm.cxx.key_method_may_be_inline ())
4909 determine_key_method (t);
4911 /* If a polymorphic class has no key method, we may emit the vtable
4912 in every translation unit where the class definition appears. */
4913 if (CLASSTYPE_KEY_METHOD (t) == NULL_TREE)
4914 keyed_classes = tree_cons (NULL_TREE, t, keyed_classes);
4917 /* Layout the class itself. */
4918 layout_class_type (t, &virtuals);
4919 if (CLASSTYPE_AS_BASE (t) != t)
4920 /* We use the base type for trivial assignments, and hence it
4922 compute_record_mode (CLASSTYPE_AS_BASE (t));
4924 virtuals = modify_all_vtables (t, nreverse (virtuals));
4926 /* If necessary, create the primary vtable for this class. */
4927 if (virtuals || TYPE_CONTAINS_VPTR_P (t))
4929 /* We must enter these virtuals into the table. */
4930 if (!CLASSTYPE_HAS_PRIMARY_BASE_P (t))
4931 build_primary_vtable (NULL_TREE, t);
4932 else if (! BINFO_NEW_VTABLE_MARKED (TYPE_BINFO (t)))
4933 /* Here we know enough to change the type of our virtual
4934 function table, but we will wait until later this function. */
4935 build_primary_vtable (CLASSTYPE_PRIMARY_BINFO (t), t);
4938 if (TYPE_CONTAINS_VPTR_P (t))
4943 if (BINFO_VTABLE (TYPE_BINFO (t)))
4944 gcc_assert (DECL_VIRTUAL_P (BINFO_VTABLE (TYPE_BINFO (t))));
4945 if (!CLASSTYPE_HAS_PRIMARY_BASE_P (t))
4946 gcc_assert (BINFO_VIRTUALS (TYPE_BINFO (t)) == NULL_TREE);
4948 /* Add entries for virtual functions introduced by this class. */
4949 BINFO_VIRTUALS (TYPE_BINFO (t))
4950 = chainon (BINFO_VIRTUALS (TYPE_BINFO (t)), virtuals);
4952 /* Set DECL_VINDEX for all functions declared in this class. */
4953 for (vindex = 0, fn = BINFO_VIRTUALS (TYPE_BINFO (t));
4955 fn = TREE_CHAIN (fn),
4956 vindex += (TARGET_VTABLE_USES_DESCRIPTORS
4957 ? TARGET_VTABLE_USES_DESCRIPTORS : 1))
4959 tree fndecl = BV_FN (fn);
4961 if (DECL_THUNK_P (fndecl))
4962 /* A thunk. We should never be calling this entry directly
4963 from this vtable -- we'd use the entry for the non
4964 thunk base function. */
4965 DECL_VINDEX (fndecl) = NULL_TREE;
4966 else if (TREE_CODE (DECL_VINDEX (fndecl)) != INTEGER_CST)
4967 DECL_VINDEX (fndecl) = build_int_cst (NULL_TREE, vindex);
4971 finish_struct_bits (t);
4973 /* Complete the rtl for any static member objects of the type we're
4975 for (x = TYPE_FIELDS (t); x; x = TREE_CHAIN (x))
4976 if (TREE_CODE (x) == VAR_DECL && TREE_STATIC (x)
4977 && same_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (x)), t))
4978 DECL_MODE (x) = TYPE_MODE (t);
4980 /* Done with FIELDS...now decide whether to sort these for
4981 faster lookups later.
4983 We use a small number because most searches fail (succeeding
4984 ultimately as the search bores through the inheritance
4985 hierarchy), and we want this failure to occur quickly. */
4987 n_fields = count_fields (TYPE_FIELDS (t));
4990 struct sorted_fields_type *field_vec = GGC_NEWVAR
4991 (struct sorted_fields_type,
4992 sizeof (struct sorted_fields_type) + n_fields * sizeof (tree));
4993 field_vec->len = n_fields;
4994 add_fields_to_record_type (TYPE_FIELDS (t), field_vec, 0);
4995 qsort (field_vec->elts, n_fields, sizeof (tree),
4997 if (! DECL_LANG_SPECIFIC (TYPE_MAIN_DECL (t)))
4998 retrofit_lang_decl (TYPE_MAIN_DECL (t));
4999 DECL_SORTED_FIELDS (TYPE_MAIN_DECL (t)) = field_vec;
5002 /* Make the rtl for any new vtables we have created, and unmark
5003 the base types we marked. */
5006 /* Build the VTT for T. */
5009 if (warn_nonvdtor && TYPE_POLYMORPHIC_P (t) && TYPE_HAS_DESTRUCTOR (t)
5010 && !DECL_VINDEX (CLASSTYPE_DESTRUCTORS (t)))
5013 tree dtor = CLASSTYPE_DESTRUCTORS (t);
5015 /* Warn only if the dtor is non-private or the class has friends */
5016 if (!TREE_PRIVATE (dtor) ||
5017 (CLASSTYPE_FRIEND_CLASSES (t) ||
5018 DECL_FRIENDLIST (TYPE_MAIN_DECL (t))))
5019 warning ("%q#T has virtual functions but non-virtual destructor", t);
5024 if (warn_overloaded_virtual)
5027 maybe_suppress_debug_info (t);
5029 dump_class_hierarchy (t);
5031 /* Finish debugging output for this type. */
5032 rest_of_type_compilation (t, ! LOCAL_CLASS_P (t));
5035 /* When T was built up, the member declarations were added in reverse
5036 order. Rearrange them to declaration order. */
5039 unreverse_member_declarations (tree t)
5045 /* The following lists are all in reverse order. Put them in
5046 declaration order now. */
5047 TYPE_METHODS (t) = nreverse (TYPE_METHODS (t));
5048 CLASSTYPE_DECL_LIST (t) = nreverse (CLASSTYPE_DECL_LIST (t));
5050 /* Actually, for the TYPE_FIELDS, only the non TYPE_DECLs are in
5051 reverse order, so we can't just use nreverse. */
5053 for (x = TYPE_FIELDS (t);
5054 x && TREE_CODE (x) != TYPE_DECL;
5057 next = TREE_CHAIN (x);
5058 TREE_CHAIN (x) = prev;
5063 TREE_CHAIN (TYPE_FIELDS (t)) = x;
5065 TYPE_FIELDS (t) = prev;
5070 finish_struct (tree t, tree attributes)
5072 location_t saved_loc = input_location;
5074 /* Now that we've got all the field declarations, reverse everything
5076 unreverse_member_declarations (t);
5078 cplus_decl_attributes (&t, attributes, (int) ATTR_FLAG_TYPE_IN_PLACE);
5080 /* Nadger the current location so that diagnostics point to the start of
5081 the struct, not the end. */
5082 input_location = DECL_SOURCE_LOCATION (TYPE_NAME (t));
5084 if (processing_template_decl)
5088 finish_struct_methods (t);
5089 TYPE_SIZE (t) = bitsize_zero_node;
5091 /* We need to emit an error message if this type was used as a parameter
5092 and it is an abstract type, even if it is a template. We construct
5093 a simple CLASSTYPE_PURE_VIRTUALS list without taking bases into
5094 account and we call complete_vars with this type, which will check
5095 the PARM_DECLS. Note that while the type is being defined,
5096 CLASSTYPE_PURE_VIRTUALS contains the list of the inline friends
5097 (see CLASSTYPE_INLINE_FRIENDS) so we need to clear it. */
5098 CLASSTYPE_PURE_VIRTUALS (t) = NULL;
5099 for (x = TYPE_METHODS (t); x; x = TREE_CHAIN (x))
5100 if (DECL_PURE_VIRTUAL_P (x))
5101 VEC_safe_push (tree, CLASSTYPE_PURE_VIRTUALS (t), x);
5105 finish_struct_1 (t);
5107 input_location = saved_loc;
5109 TYPE_BEING_DEFINED (t) = 0;
5111 if (current_class_type)
5114 error ("trying to finish struct, but kicked out due to previous parse errors");
5116 if (processing_template_decl && at_function_scope_p ())
5117 add_stmt (build_min (TAG_DEFN, t));
5122 /* Return the dynamic type of INSTANCE, if known.
5123 Used to determine whether the virtual function table is needed
5126 *NONNULL is set iff INSTANCE can be known to be nonnull, regardless
5127 of our knowledge of its type. *NONNULL should be initialized
5128 before this function is called. */
5131 fixed_type_or_null (tree instance, int* nonnull, int* cdtorp)
5133 switch (TREE_CODE (instance))
5136 if (POINTER_TYPE_P (TREE_TYPE (instance)))
5139 return fixed_type_or_null (TREE_OPERAND (instance, 0),
5143 /* This is a call to a constructor, hence it's never zero. */
5144 if (TREE_HAS_CONSTRUCTOR (instance))
5148 return TREE_TYPE (instance);
5153 /* This is a call to a constructor, hence it's never zero. */
5154 if (TREE_HAS_CONSTRUCTOR (instance))
5158 return TREE_TYPE (instance);
5160 return fixed_type_or_null (TREE_OPERAND (instance, 0), nonnull, cdtorp);
5164 if (TREE_CODE (TREE_OPERAND (instance, 0)) == ADDR_EXPR)
5165 return fixed_type_or_null (TREE_OPERAND (instance, 0), nonnull, cdtorp);
5166 if (TREE_CODE (TREE_OPERAND (instance, 1)) == INTEGER_CST)
5167 /* Propagate nonnull. */
5168 return fixed_type_or_null (TREE_OPERAND (instance, 0), nonnull, cdtorp);
5173 return fixed_type_or_null (TREE_OPERAND (instance, 0), nonnull, cdtorp);
5176 instance = TREE_OPERAND (instance, 0);
5179 /* Just because we see an ADDR_EXPR doesn't mean we're dealing
5180 with a real object -- given &p->f, p can still be null. */
5181 tree t = get_base_address (instance);
5182 /* ??? Probably should check DECL_WEAK here. */
5183 if (t && DECL_P (t))
5186 return fixed_type_or_null (instance, nonnull, cdtorp);
5189 /* If this component is really a base class reference, then the field
5190 itself isn't definitive. */
5191 if (DECL_FIELD_IS_BASE (TREE_OPERAND (instance, 1)))
5192 return fixed_type_or_null (TREE_OPERAND (instance, 0), nonnull, cdtorp);
5193 return fixed_type_or_null (TREE_OPERAND (instance, 1), nonnull, cdtorp);
5197 if (TREE_CODE (TREE_TYPE (instance)) == ARRAY_TYPE
5198 && IS_AGGR_TYPE (TREE_TYPE (TREE_TYPE (instance))))
5202 return TREE_TYPE (TREE_TYPE (instance));
5204 /* fall through... */
5208 if (IS_AGGR_TYPE (TREE_TYPE (instance)))
5212 return TREE_TYPE (instance);
5214 else if (instance == current_class_ptr)
5219 /* if we're in a ctor or dtor, we know our type. */
5220 if (DECL_LANG_SPECIFIC (current_function_decl)
5221 && (DECL_CONSTRUCTOR_P (current_function_decl)
5222 || DECL_DESTRUCTOR_P (current_function_decl)))
5226 return TREE_TYPE (TREE_TYPE (instance));
5229 else if (TREE_CODE (TREE_TYPE (instance)) == REFERENCE_TYPE)
5231 /* Reference variables should be references to objects. */
5235 /* DECL_VAR_MARKED_P is used to prevent recursion; a
5236 variable's initializer may refer to the variable
5238 if (TREE_CODE (instance) == VAR_DECL
5239 && DECL_INITIAL (instance)
5240 && !DECL_VAR_MARKED_P (instance))
5243 DECL_VAR_MARKED_P (instance) = 1;
5244 type = fixed_type_or_null (DECL_INITIAL (instance),
5246 DECL_VAR_MARKED_P (instance) = 0;
5257 /* Return nonzero if the dynamic type of INSTANCE is known, and
5258 equivalent to the static type. We also handle the case where
5259 INSTANCE is really a pointer. Return negative if this is a
5260 ctor/dtor. There the dynamic type is known, but this might not be
5261 the most derived base of the original object, and hence virtual
5262 bases may not be layed out according to this type.
5264 Used to determine whether the virtual function table is needed
5267 *NONNULL is set iff INSTANCE can be known to be nonnull, regardless
5268 of our knowledge of its type. *NONNULL should be initialized
5269 before this function is called. */
5272 resolves_to_fixed_type_p (tree instance, int* nonnull)
5274 tree t = TREE_TYPE (instance);
5277 tree fixed = fixed_type_or_null (instance, nonnull, &cdtorp);
5278 if (fixed == NULL_TREE)
5280 if (POINTER_TYPE_P (t))
5282 if (!same_type_ignoring_top_level_qualifiers_p (t, fixed))
5284 return cdtorp ? -1 : 1;
5289 init_class_processing (void)
5291 current_class_depth = 0;
5292 current_class_stack_size = 10;
5294 = xmalloc (current_class_stack_size * sizeof (struct class_stack_node));
5295 VARRAY_TREE_INIT (local_classes, 8, "local_classes");
5297 ridpointers[(int) RID_PUBLIC] = access_public_node;
5298 ridpointers[(int) RID_PRIVATE] = access_private_node;
5299 ridpointers[(int) RID_PROTECTED] = access_protected_node;
5302 /* Restore the cached PREVIOUS_CLASS_LEVEL. */
5305 restore_class_cache (void)
5309 /* We are re-entering the same class we just left, so we don't
5310 have to search the whole inheritance matrix to find all the
5311 decls to bind again. Instead, we install the cached
5312 class_shadowed list and walk through it binding names. */
5313 push_binding_level (previous_class_level);
5314 class_binding_level = previous_class_level;
5315 /* Restore IDENTIFIER_TYPE_VALUE. */
5316 for (type = class_binding_level->type_shadowed;
5318 type = TREE_CHAIN (type))
5319 SET_IDENTIFIER_TYPE_VALUE (TREE_PURPOSE (type), TREE_TYPE (type));
5322 /* Set global variables CURRENT_CLASS_NAME and CURRENT_CLASS_TYPE as
5323 appropriate for TYPE.
5325 So that we may avoid calls to lookup_name, we cache the _TYPE
5326 nodes of local TYPE_DECLs in the TREE_TYPE field of the name.
5328 For multiple inheritance, we perform a two-pass depth-first search
5329 of the type lattice. */
5332 pushclass (tree type)
5334 type = TYPE_MAIN_VARIANT (type);
5336 /* Make sure there is enough room for the new entry on the stack. */
5337 if (current_class_depth + 1 >= current_class_stack_size)
5339 current_class_stack_size *= 2;
5341 = xrealloc (current_class_stack,
5342 current_class_stack_size
5343 * sizeof (struct class_stack_node));
5346 /* Insert a new entry on the class stack. */
5347 current_class_stack[current_class_depth].name = current_class_name;
5348 current_class_stack[current_class_depth].type = current_class_type;
5349 current_class_stack[current_class_depth].access = current_access_specifier;
5350 current_class_stack[current_class_depth].names_used = 0;
5351 current_class_depth++;
5353 /* Now set up the new type. */
5354 current_class_name = TYPE_NAME (type);
5355 if (TREE_CODE (current_class_name) == TYPE_DECL)
5356 current_class_name = DECL_NAME (current_class_name);
5357 current_class_type = type;
5359 /* By default, things in classes are private, while things in
5360 structures or unions are public. */
5361 current_access_specifier = (CLASSTYPE_DECLARED_CLASS (type)
5362 ? access_private_node
5363 : access_public_node);
5365 if (previous_class_level
5366 && type != previous_class_level->this_entity
5367 && current_class_depth == 1)
5369 /* Forcibly remove any old class remnants. */
5370 invalidate_class_lookup_cache ();
5373 if (!previous_class_level
5374 || type != previous_class_level->this_entity
5375 || current_class_depth > 1)
5378 restore_class_cache ();
5381 /* When we exit a toplevel class scope, we save its binding level so
5382 that we can restore it quickly. Here, we've entered some other
5383 class, so we must invalidate our cache. */
5386 invalidate_class_lookup_cache (void)
5388 previous_class_level = NULL;
5391 /* Get out of the current class scope. If we were in a class scope
5392 previously, that is the one popped to. */
5399 current_class_depth--;
5400 current_class_name = current_class_stack[current_class_depth].name;
5401 current_class_type = current_class_stack[current_class_depth].type;
5402 current_access_specifier = current_class_stack[current_class_depth].access;
5403 if (current_class_stack[current_class_depth].names_used)
5404 splay_tree_delete (current_class_stack[current_class_depth].names_used);
5407 /* Returns 1 if current_class_type is either T or a nested type of T.
5408 We start looking from 1 because entry 0 is from global scope, and has
5412 currently_open_class (tree t)
5415 if (current_class_type && same_type_p (t, current_class_type))
5417 for (i = 1; i < current_class_depth; ++i)
5418 if (current_class_stack[i].type
5419 && same_type_p (current_class_stack [i].type, t))
5424 /* If either current_class_type or one of its enclosing classes are derived
5425 from T, return the appropriate type. Used to determine how we found
5426 something via unqualified lookup. */
5429 currently_open_derived_class (tree t)
5433 /* The bases of a dependent type are unknown. */
5434 if (dependent_type_p (t))
5437 if (!current_class_type)
5440 if (DERIVED_FROM_P (t, current_class_type))
5441 return current_class_type;
5443 for (i = current_class_depth - 1; i > 0; --i)
5444 if (DERIVED_FROM_P (t, current_class_stack[i].type))
5445 return current_class_stack[i].type;
5450 /* When entering a class scope, all enclosing class scopes' names with
5451 static meaning (static variables, static functions, types and
5452 enumerators) have to be visible. This recursive function calls
5453 pushclass for all enclosing class contexts until global or a local
5454 scope is reached. TYPE is the enclosed class. */
5457 push_nested_class (tree type)
5461 /* A namespace might be passed in error cases, like A::B:C. */
5462 if (type == NULL_TREE
5463 || type == error_mark_node
5464 || TREE_CODE (type) == NAMESPACE_DECL
5465 || ! IS_AGGR_TYPE (type)
5466 || TREE_CODE (type) == TEMPLATE_TYPE_PARM
5467 || TREE_CODE (type) == BOUND_TEMPLATE_TEMPLATE_PARM)
5470 context = DECL_CONTEXT (TYPE_MAIN_DECL (type));
5472 if (context && CLASS_TYPE_P (context))
5473 push_nested_class (context);
5477 /* Undoes a push_nested_class call. */
5480 pop_nested_class (void)
5482 tree context = DECL_CONTEXT (TYPE_MAIN_DECL (current_class_type));
5485 if (context && CLASS_TYPE_P (context))
5486 pop_nested_class ();
5489 /* Returns the number of extern "LANG" blocks we are nested within. */
5492 current_lang_depth (void)
5494 return VARRAY_ACTIVE_SIZE (current_lang_base);
5497 /* Set global variables CURRENT_LANG_NAME to appropriate value
5498 so that behavior of name-mangling machinery is correct. */
5501 push_lang_context (tree name)
5503 VARRAY_PUSH_TREE (current_lang_base, current_lang_name);
5505 if (name == lang_name_cplusplus)
5507 current_lang_name = name;
5509 else if (name == lang_name_java)
5511 current_lang_name = name;
5512 /* DECL_IGNORED_P is initially set for these types, to avoid clutter.
5513 (See record_builtin_java_type in decl.c.) However, that causes
5514 incorrect debug entries if these types are actually used.
5515 So we re-enable debug output after extern "Java". */
5516 DECL_IGNORED_P (TYPE_NAME (java_byte_type_node)) = 0;
5517 DECL_IGNORED_P (TYPE_NAME (java_short_type_node)) = 0;
5518 DECL_IGNORED_P (TYPE_NAME (java_int_type_node)) = 0;
5519 DECL_IGNORED_P (TYPE_NAME (java_long_type_node)) = 0;
5520 DECL_IGNORED_P (TYPE_NAME (java_float_type_node)) = 0;
5521 DECL_IGNORED_P (TYPE_NAME (java_double_type_node)) = 0;
5522 DECL_IGNORED_P (TYPE_NAME (java_char_type_node)) = 0;
5523 DECL_IGNORED_P (TYPE_NAME (java_boolean_type_node)) = 0;
5525 else if (name == lang_name_c)
5527 current_lang_name = name;
5530 error ("language string %<\"%E\"%> not recognized", name);
5533 /* Get out of the current language scope. */
5536 pop_lang_context (void)
5538 current_lang_name = VARRAY_TOP_TREE (current_lang_base);
5539 VARRAY_POP (current_lang_base);
5542 /* Type instantiation routines. */
5544 /* Given an OVERLOAD and a TARGET_TYPE, return the function that
5545 matches the TARGET_TYPE. If there is no satisfactory match, return
5546 error_mark_node, and issue a error & warning messages under control
5547 of FLAGS. Permit pointers to member function if FLAGS permits. If
5548 TEMPLATE_ONLY, the name of the overloaded function was a
5549 template-id, and EXPLICIT_TARGS are the explicitly provided
5550 template arguments. */
5553 resolve_address_of_overloaded_function (tree target_type,
5555 tsubst_flags_t flags,
5557 tree explicit_targs)
5559 /* Here's what the standard says:
5563 If the name is a function template, template argument deduction
5564 is done, and if the argument deduction succeeds, the deduced
5565 arguments are used to generate a single template function, which
5566 is added to the set of overloaded functions considered.
5568 Non-member functions and static member functions match targets of
5569 type "pointer-to-function" or "reference-to-function." Nonstatic
5570 member functions match targets of type "pointer-to-member
5571 function;" the function type of the pointer to member is used to
5572 select the member function from the set of overloaded member
5573 functions. If a nonstatic member function is selected, the
5574 reference to the overloaded function name is required to have the
5575 form of a pointer to member as described in 5.3.1.
5577 If more than one function is selected, any template functions in
5578 the set are eliminated if the set also contains a non-template
5579 function, and any given template function is eliminated if the
5580 set contains a second template function that is more specialized
5581 than the first according to the partial ordering rules 14.5.5.2.
5582 After such eliminations, if any, there shall remain exactly one
5583 selected function. */
5586 int is_reference = 0;
5587 /* We store the matches in a TREE_LIST rooted here. The functions
5588 are the TREE_PURPOSE, not the TREE_VALUE, in this list, for easy
5589 interoperability with most_specialized_instantiation. */
5590 tree matches = NULL_TREE;
5593 /* By the time we get here, we should be seeing only real
5594 pointer-to-member types, not the internal POINTER_TYPE to
5595 METHOD_TYPE representation. */
5596 gcc_assert (TREE_CODE (target_type) != POINTER_TYPE
5597 || TREE_CODE (TREE_TYPE (target_type)) != METHOD_TYPE);
5599 gcc_assert (is_overloaded_fn (overload));
5601 /* Check that the TARGET_TYPE is reasonable. */
5602 if (TYPE_PTRFN_P (target_type))
5604 else if (TYPE_PTRMEMFUNC_P (target_type))
5605 /* This is OK, too. */
5607 else if (TREE_CODE (target_type) == FUNCTION_TYPE)
5609 /* This is OK, too. This comes from a conversion to reference
5611 target_type = build_reference_type (target_type);
5616 if (flags & tf_error)
5617 error ("cannot resolve overloaded function %qD based on"
5618 " conversion to type %qT",
5619 DECL_NAME (OVL_FUNCTION (overload)), target_type);
5620 return error_mark_node;
5623 /* If we can find a non-template function that matches, we can just
5624 use it. There's no point in generating template instantiations
5625 if we're just going to throw them out anyhow. But, of course, we
5626 can only do this when we don't *need* a template function. */
5631 for (fns = overload; fns; fns = OVL_NEXT (fns))
5633 tree fn = OVL_CURRENT (fns);
5636 if (TREE_CODE (fn) == TEMPLATE_DECL)
5637 /* We're not looking for templates just yet. */
5640 if ((TREE_CODE (TREE_TYPE (fn)) == METHOD_TYPE)
5642 /* We're looking for a non-static member, and this isn't
5643 one, or vice versa. */
5646 /* Ignore anticipated decls of undeclared builtins. */
5647 if (DECL_ANTICIPATED (fn))
5650 /* See if there's a match. */
5651 fntype = TREE_TYPE (fn);
5653 fntype = build_ptrmemfunc_type (build_pointer_type (fntype));
5654 else if (!is_reference)
5655 fntype = build_pointer_type (fntype);
5657 if (can_convert_arg (target_type, fntype, fn))
5658 matches = tree_cons (fn, NULL_TREE, matches);
5662 /* Now, if we've already got a match (or matches), there's no need
5663 to proceed to the template functions. But, if we don't have a
5664 match we need to look at them, too. */
5667 tree target_fn_type;
5668 tree target_arg_types;
5669 tree target_ret_type;
5674 = TREE_TYPE (TYPE_PTRMEMFUNC_FN_TYPE (target_type));
5676 target_fn_type = TREE_TYPE (target_type);
5677 target_arg_types = TYPE_ARG_TYPES (target_fn_type);
5678 target_ret_type = TREE_TYPE (target_fn_type);
5680 /* Never do unification on the 'this' parameter. */
5681 if (TREE_CODE (target_fn_type) == METHOD_TYPE)
5682 target_arg_types = TREE_CHAIN (target_arg_types);
5684 for (fns = overload; fns; fns = OVL_NEXT (fns))
5686 tree fn = OVL_CURRENT (fns);
5688 tree instantiation_type;
5691 if (TREE_CODE (fn) != TEMPLATE_DECL)
5692 /* We're only looking for templates. */
5695 if ((TREE_CODE (TREE_TYPE (fn)) == METHOD_TYPE)
5697 /* We're not looking for a non-static member, and this is
5698 one, or vice versa. */
5701 /* Try to do argument deduction. */
5702 targs = make_tree_vec (DECL_NTPARMS (fn));
5703 if (fn_type_unification (fn, explicit_targs, targs,
5704 target_arg_types, target_ret_type,
5705 DEDUCE_EXACT, -1) != 0)
5706 /* Argument deduction failed. */
5709 /* Instantiate the template. */
5710 instantiation = instantiate_template (fn, targs, flags);
5711 if (instantiation == error_mark_node)
5712 /* Instantiation failed. */
5715 /* See if there's a match. */
5716 instantiation_type = TREE_TYPE (instantiation);
5718 instantiation_type =
5719 build_ptrmemfunc_type (build_pointer_type (instantiation_type));
5720 else if (!is_reference)
5721 instantiation_type = build_pointer_type (instantiation_type);
5722 if (can_convert_arg (target_type, instantiation_type, instantiation))
5723 matches = tree_cons (instantiation, fn, matches);
5726 /* Now, remove all but the most specialized of the matches. */
5729 tree match = most_specialized_instantiation (matches);
5731 if (match != error_mark_node)
5732 matches = tree_cons (match, NULL_TREE, NULL_TREE);
5736 /* Now we should have exactly one function in MATCHES. */
5737 if (matches == NULL_TREE)
5739 /* There were *no* matches. */
5740 if (flags & tf_error)
5742 error ("no matches converting function %qD to type %q#T",
5743 DECL_NAME (OVL_FUNCTION (overload)),
5746 /* print_candidates expects a chain with the functions in
5747 TREE_VALUE slots, so we cons one up here (we're losing anyway,
5748 so why be clever?). */
5749 for (; overload; overload = OVL_NEXT (overload))
5750 matches = tree_cons (NULL_TREE, OVL_CURRENT (overload),
5753 print_candidates (matches);
5755 return error_mark_node;
5757 else if (TREE_CHAIN (matches))
5759 /* There were too many matches. */
5761 if (flags & tf_error)
5765 error ("converting overloaded function %qD to type %q#T is ambiguous",
5766 DECL_NAME (OVL_FUNCTION (overload)),
5769 /* Since print_candidates expects the functions in the
5770 TREE_VALUE slot, we flip them here. */
5771 for (match = matches; match; match = TREE_CHAIN (match))
5772 TREE_VALUE (match) = TREE_PURPOSE (match);
5774 print_candidates (matches);
5777 return error_mark_node;
5780 /* Good, exactly one match. Now, convert it to the correct type. */
5781 fn = TREE_PURPOSE (matches);
5783 if (DECL_NONSTATIC_MEMBER_FUNCTION_P (fn)
5784 && !(flags & tf_ptrmem_ok) && !flag_ms_extensions)
5786 static int explained;
5788 if (!(flags & tf_error))
5789 return error_mark_node;
5791 pedwarn ("assuming pointer to member %qD", fn);
5794 pedwarn ("(a pointer to member can only be formed with %<&%E%>)", fn);
5799 /* If we're doing overload resolution purely for the purpose of
5800 determining conversion sequences, we should not consider the
5801 function used. If this conversion sequence is selected, the
5802 function will be marked as used at this point. */
5803 if (!(flags & tf_conv))
5806 if (TYPE_PTRFN_P (target_type) || TYPE_PTRMEMFUNC_P (target_type))
5807 return build_unary_op (ADDR_EXPR, fn, 0);
5810 /* The target must be a REFERENCE_TYPE. Above, build_unary_op
5811 will mark the function as addressed, but here we must do it
5813 cxx_mark_addressable (fn);
5819 /* This function will instantiate the type of the expression given in
5820 RHS to match the type of LHSTYPE. If errors exist, then return
5821 error_mark_node. FLAGS is a bit mask. If TF_ERROR is set, then
5822 we complain on errors. If we are not complaining, never modify rhs,
5823 as overload resolution wants to try many possible instantiations, in
5824 the hope that at least one will work.
5826 For non-recursive calls, LHSTYPE should be a function, pointer to
5827 function, or a pointer to member function. */
5830 instantiate_type (tree lhstype, tree rhs, tsubst_flags_t flags)
5832 tsubst_flags_t flags_in = flags;
5834 flags &= ~tf_ptrmem_ok;
5836 if (TREE_CODE (lhstype) == UNKNOWN_TYPE)
5838 if (flags & tf_error)
5839 error ("not enough type information");
5840 return error_mark_node;
5843 if (TREE_TYPE (rhs) != NULL_TREE && ! (type_unknown_p (rhs)))
5845 if (same_type_p (lhstype, TREE_TYPE (rhs)))
5847 if (flag_ms_extensions
5848 && TYPE_PTRMEMFUNC_P (lhstype)
5849 && !TYPE_PTRMEMFUNC_P (TREE_TYPE (rhs)))
5850 /* Microsoft allows `A::f' to be resolved to a
5851 pointer-to-member. */
5855 if (flags & tf_error)
5856 error ("argument of type %qT does not match %qT",
5857 TREE_TYPE (rhs), lhstype);
5858 return error_mark_node;
5862 if (TREE_CODE (rhs) == BASELINK)
5863 rhs = BASELINK_FUNCTIONS (rhs);
5865 /* If we are in a template, and have a NON_DEPENDENT_EXPR, we cannot
5866 deduce any type information. */
5867 if (TREE_CODE (rhs) == NON_DEPENDENT_EXPR)
5869 if (flags & tf_error)
5870 error ("not enough type information");
5871 return error_mark_node;
5874 /* We don't overwrite rhs if it is an overloaded function.
5875 Copying it would destroy the tree link. */
5876 if (TREE_CODE (rhs) != OVERLOAD)
5877 rhs = copy_node (rhs);
5879 /* This should really only be used when attempting to distinguish
5880 what sort of a pointer to function we have. For now, any
5881 arithmetic operation which is not supported on pointers
5882 is rejected as an error. */
5884 switch (TREE_CODE (rhs))
5897 new_rhs = instantiate_type (build_pointer_type (lhstype),
5898 TREE_OPERAND (rhs, 0), flags);
5899 if (new_rhs == error_mark_node)
5900 return error_mark_node;
5902 TREE_TYPE (rhs) = lhstype;
5903 TREE_OPERAND (rhs, 0) = new_rhs;
5908 rhs = copy_node (TREE_OPERAND (rhs, 0));
5909 TREE_TYPE (rhs) = unknown_type_node;
5910 return instantiate_type (lhstype, rhs, flags);
5914 tree member = TREE_OPERAND (rhs, 1);
5916 member = instantiate_type (lhstype, member, flags);
5917 if (member != error_mark_node
5918 && TREE_SIDE_EFFECTS (TREE_OPERAND (rhs, 0)))
5919 /* Do not lose object's side effects. */
5920 return build2 (COMPOUND_EXPR, TREE_TYPE (member),
5921 TREE_OPERAND (rhs, 0), member);
5926 rhs = TREE_OPERAND (rhs, 1);
5927 if (BASELINK_P (rhs))
5928 return instantiate_type (lhstype, BASELINK_FUNCTIONS (rhs), flags_in);
5930 /* This can happen if we are forming a pointer-to-member for a
5932 gcc_assert (TREE_CODE (rhs) == TEMPLATE_ID_EXPR);
5936 case TEMPLATE_ID_EXPR:
5938 tree fns = TREE_OPERAND (rhs, 0);
5939 tree args = TREE_OPERAND (rhs, 1);
5942 resolve_address_of_overloaded_function (lhstype, fns, flags_in,
5943 /*template_only=*/true,
5950 resolve_address_of_overloaded_function (lhstype, rhs, flags_in,
5951 /*template_only=*/false,
5952 /*explicit_targs=*/NULL_TREE);
5955 /* This is too hard for now. */
5961 TREE_OPERAND (rhs, 0)
5962 = instantiate_type (lhstype, TREE_OPERAND (rhs, 0), flags);
5963 if (TREE_OPERAND (rhs, 0) == error_mark_node)
5964 return error_mark_node;
5965 TREE_OPERAND (rhs, 1)
5966 = instantiate_type (lhstype, TREE_OPERAND (rhs, 1), flags);
5967 if (TREE_OPERAND (rhs, 1) == error_mark_node)
5968 return error_mark_node;
5970 TREE_TYPE (rhs) = lhstype;
5974 case TRUNC_DIV_EXPR:
5975 case FLOOR_DIV_EXPR:
5977 case ROUND_DIV_EXPR:
5979 case TRUNC_MOD_EXPR:
5980 case FLOOR_MOD_EXPR:
5982 case ROUND_MOD_EXPR:
5983 case FIX_ROUND_EXPR:
5984 case FIX_FLOOR_EXPR:
5986 case FIX_TRUNC_EXPR:
6001 case PREINCREMENT_EXPR:
6002 case PREDECREMENT_EXPR:
6003 case POSTINCREMENT_EXPR:
6004 case POSTDECREMENT_EXPR:
6005 if (flags & tf_error)
6006 error ("invalid operation on uninstantiated type");
6007 return error_mark_node;
6009 case TRUTH_AND_EXPR:
6011 case TRUTH_XOR_EXPR:
6018 case TRUTH_ANDIF_EXPR:
6019 case TRUTH_ORIF_EXPR:
6020 case TRUTH_NOT_EXPR:
6021 if (flags & tf_error)
6022 error ("not enough type information");
6023 return error_mark_node;
6026 if (type_unknown_p (TREE_OPERAND (rhs, 0)))
6028 if (flags & tf_error)
6029 error ("not enough type information");
6030 return error_mark_node;
6032 TREE_OPERAND (rhs, 1)
6033 = instantiate_type (lhstype, TREE_OPERAND (rhs, 1), flags);
6034 if (TREE_OPERAND (rhs, 1) == error_mark_node)
6035 return error_mark_node;
6036 TREE_OPERAND (rhs, 2)
6037 = instantiate_type (lhstype, TREE_OPERAND (rhs, 2), flags);
6038 if (TREE_OPERAND (rhs, 2) == error_mark_node)
6039 return error_mark_node;
6041 TREE_TYPE (rhs) = lhstype;
6045 TREE_OPERAND (rhs, 1)
6046 = instantiate_type (lhstype, TREE_OPERAND (rhs, 1), flags);
6047 if (TREE_OPERAND (rhs, 1) == error_mark_node)
6048 return error_mark_node;
6050 TREE_TYPE (rhs) = lhstype;
6055 if (PTRMEM_OK_P (rhs))
6056 flags |= tf_ptrmem_ok;
6058 return instantiate_type (lhstype, TREE_OPERAND (rhs, 0), flags);
6062 return error_mark_node;
6067 return error_mark_node;
6070 /* Return the name of the virtual function pointer field
6071 (as an IDENTIFIER_NODE) for the given TYPE. Note that
6072 this may have to look back through base types to find the
6073 ultimate field name. (For single inheritance, these could
6074 all be the same name. Who knows for multiple inheritance). */
6077 get_vfield_name (tree type)
6079 tree binfo, base_binfo;
6082 for (binfo = TYPE_BINFO (type);
6083 BINFO_N_BASE_BINFOS (binfo);
6086 base_binfo = BINFO_BASE_BINFO (binfo, 0);
6088 if (BINFO_VIRTUAL_P (base_binfo)
6089 || !TYPE_CONTAINS_VPTR_P (BINFO_TYPE (base_binfo)))
6093 type = BINFO_TYPE (binfo);
6094 buf = alloca (sizeof (VFIELD_NAME_FORMAT) + TYPE_NAME_LENGTH (type) + 2);
6095 sprintf (buf, VFIELD_NAME_FORMAT,
6096 IDENTIFIER_POINTER (constructor_name (type)));
6097 return get_identifier (buf);
6101 print_class_statistics (void)
6103 #ifdef GATHER_STATISTICS
6104 fprintf (stderr, "convert_harshness = %d\n", n_convert_harshness);
6105 fprintf (stderr, "compute_conversion_costs = %d\n", n_compute_conversion_costs);
6108 fprintf (stderr, "vtables = %d; vtable searches = %d\n",
6109 n_vtables, n_vtable_searches);
6110 fprintf (stderr, "vtable entries = %d; vtable elems = %d\n",
6111 n_vtable_entries, n_vtable_elems);
6116 /* Build a dummy reference to ourselves so Derived::Base (and A::A) works,
6117 according to [class]:
6118 The class-name is also inserted
6119 into the scope of the class itself. For purposes of access checking,
6120 the inserted class name is treated as if it were a public member name. */
6123 build_self_reference (void)
6125 tree name = constructor_name (current_class_type);
6126 tree value = build_lang_decl (TYPE_DECL, name, current_class_type);
6129 DECL_NONLOCAL (value) = 1;
6130 DECL_CONTEXT (value) = current_class_type;
6131 DECL_ARTIFICIAL (value) = 1;
6132 SET_DECL_SELF_REFERENCE_P (value);
6134 if (processing_template_decl)
6135 value = push_template_decl (value);
6137 saved_cas = current_access_specifier;
6138 current_access_specifier = access_public_node;
6139 finish_member_declaration (value);
6140 current_access_specifier = saved_cas;
6143 /* Returns 1 if TYPE contains only padding bytes. */
6146 is_empty_class (tree type)
6148 if (type == error_mark_node)
6151 if (! IS_AGGR_TYPE (type))
6154 /* In G++ 3.2, whether or not a class was empty was determined by
6155 looking at its size. */
6156 if (abi_version_at_least (2))
6157 return CLASSTYPE_EMPTY_P (type);
6159 return integer_zerop (CLASSTYPE_SIZE (type));
6162 /* Returns true if TYPE contains an empty class. */
6165 contains_empty_class_p (tree type)
6167 if (is_empty_class (type))
6169 if (CLASS_TYPE_P (type))
6176 for (binfo = TYPE_BINFO (type), i = 0;
6177 BINFO_BASE_ITERATE (binfo, i, base_binfo); ++i)
6178 if (contains_empty_class_p (BINFO_TYPE (base_binfo)))
6180 for (field = TYPE_FIELDS (type); field; field = TREE_CHAIN (field))
6181 if (TREE_CODE (field) == FIELD_DECL
6182 && !DECL_ARTIFICIAL (field)
6183 && is_empty_class (TREE_TYPE (field)))
6186 else if (TREE_CODE (type) == ARRAY_TYPE)
6187 return contains_empty_class_p (TREE_TYPE (type));
6191 /* Find the enclosing class of the given NODE. NODE can be a *_DECL or
6192 a *_TYPE node. NODE can also be a local class. */
6195 get_enclosing_class (tree type)
6199 while (node && TREE_CODE (node) != NAMESPACE_DECL)
6201 switch (TREE_CODE_CLASS (TREE_CODE (node)))
6203 case tcc_declaration:
6204 node = DECL_CONTEXT (node);
6210 node = TYPE_CONTEXT (node);
6220 /* Note that NAME was looked up while the current class was being
6221 defined and that the result of that lookup was DECL. */
6224 maybe_note_name_used_in_class (tree name, tree decl)
6226 splay_tree names_used;
6228 /* If we're not defining a class, there's nothing to do. */
6229 if (!(innermost_scope_kind() == sk_class
6230 && TYPE_BEING_DEFINED (current_class_type)))
6233 /* If there's already a binding for this NAME, then we don't have
6234 anything to worry about. */
6235 if (lookup_member (current_class_type, name,
6236 /*protect=*/0, /*want_type=*/false))
6239 if (!current_class_stack[current_class_depth - 1].names_used)
6240 current_class_stack[current_class_depth - 1].names_used
6241 = splay_tree_new (splay_tree_compare_pointers, 0, 0);
6242 names_used = current_class_stack[current_class_depth - 1].names_used;
6244 splay_tree_insert (names_used,
6245 (splay_tree_key) name,
6246 (splay_tree_value) decl);
6249 /* Note that NAME was declared (as DECL) in the current class. Check
6250 to see that the declaration is valid. */
6253 note_name_declared_in_class (tree name, tree decl)
6255 splay_tree names_used;
6258 /* Look to see if we ever used this name. */
6260 = current_class_stack[current_class_depth - 1].names_used;
6264 n = splay_tree_lookup (names_used, (splay_tree_key) name);
6267 /* [basic.scope.class]
6269 A name N used in a class S shall refer to the same declaration
6270 in its context and when re-evaluated in the completed scope of
6272 error ("declaration of %q#D", decl);
6273 cp_error_at ("changes meaning of %qD from %q+#D",
6274 DECL_NAME (OVL_CURRENT (decl)),
6279 /* Returns the VAR_DECL for the complete vtable associated with BINFO.
6280 Secondary vtables are merged with primary vtables; this function
6281 will return the VAR_DECL for the primary vtable. */
6284 get_vtbl_decl_for_binfo (tree binfo)
6288 decl = BINFO_VTABLE (binfo);
6289 if (decl && TREE_CODE (decl) == PLUS_EXPR)
6291 gcc_assert (TREE_CODE (TREE_OPERAND (decl, 0)) == ADDR_EXPR);
6292 decl = TREE_OPERAND (TREE_OPERAND (decl, 0), 0);
6295 gcc_assert (TREE_CODE (decl) == VAR_DECL);
6300 /* Returns the binfo for the primary base of BINFO. If the resulting
6301 BINFO is a virtual base, and it is inherited elsewhere in the
6302 hierarchy, then the returned binfo might not be the primary base of
6303 BINFO in the complete object. Check BINFO_PRIMARY_P or
6304 BINFO_LOST_PRIMARY_P to be sure. */
6307 get_primary_binfo (tree binfo)
6312 primary_base = CLASSTYPE_PRIMARY_BINFO (BINFO_TYPE (binfo));
6316 result = copied_binfo (primary_base, binfo);
6320 /* If INDENTED_P is zero, indent to INDENT. Return nonzero. */
6323 maybe_indent_hierarchy (FILE * stream, int indent, int indented_p)
6326 fprintf (stream, "%*s", indent, "");
6330 /* Dump the offsets of all the bases rooted at BINFO to STREAM.
6331 INDENT should be zero when called from the top level; it is
6332 incremented recursively. IGO indicates the next expected BINFO in
6333 inheritance graph ordering. */
6336 dump_class_hierarchy_r (FILE *stream,
6346 indented = maybe_indent_hierarchy (stream, indent, 0);
6347 fprintf (stream, "%s (0x%lx) ",
6348 type_as_string (BINFO_TYPE (binfo), TFF_PLAIN_IDENTIFIER),
6349 (unsigned long) binfo);
6352 fprintf (stream, "alternative-path\n");
6355 igo = TREE_CHAIN (binfo);
6357 fprintf (stream, HOST_WIDE_INT_PRINT_DEC,
6358 tree_low_cst (BINFO_OFFSET (binfo), 0));
6359 if (is_empty_class (BINFO_TYPE (binfo)))
6360 fprintf (stream, " empty");
6361 else if (CLASSTYPE_NEARLY_EMPTY_P (BINFO_TYPE (binfo)))
6362 fprintf (stream, " nearly-empty");
6363 if (BINFO_VIRTUAL_P (binfo))
6364 fprintf (stream, " virtual");
6365 fprintf (stream, "\n");
6368 if (BINFO_PRIMARY_P (binfo))
6370 indented = maybe_indent_hierarchy (stream, indent + 3, indented);
6371 fprintf (stream, " primary-for %s (0x%lx)",
6372 type_as_string (BINFO_TYPE (BINFO_INHERITANCE_CHAIN (binfo)),
6373 TFF_PLAIN_IDENTIFIER),
6374 (unsigned long)BINFO_INHERITANCE_CHAIN (binfo));
6376 if (BINFO_LOST_PRIMARY_P (binfo))
6378 indented = maybe_indent_hierarchy (stream, indent + 3, indented);
6379 fprintf (stream, " lost-primary");
6382 fprintf (stream, "\n");
6384 if (!(flags & TDF_SLIM))
6388 if (BINFO_SUBVTT_INDEX (binfo))
6390 indented = maybe_indent_hierarchy (stream, indent + 3, indented);
6391 fprintf (stream, " subvttidx=%s",
6392 expr_as_string (BINFO_SUBVTT_INDEX (binfo),
6393 TFF_PLAIN_IDENTIFIER));
6395 if (BINFO_VPTR_INDEX (binfo))
6397 indented = maybe_indent_hierarchy (stream, indent + 3, indented);
6398 fprintf (stream, " vptridx=%s",
6399 expr_as_string (BINFO_VPTR_INDEX (binfo),
6400 TFF_PLAIN_IDENTIFIER));
6402 if (BINFO_VPTR_FIELD (binfo))
6404 indented = maybe_indent_hierarchy (stream, indent + 3, indented);
6405 fprintf (stream, " vbaseoffset=%s",
6406 expr_as_string (BINFO_VPTR_FIELD (binfo),
6407 TFF_PLAIN_IDENTIFIER));
6409 if (BINFO_VTABLE (binfo))
6411 indented = maybe_indent_hierarchy (stream, indent + 3, indented);
6412 fprintf (stream, " vptr=%s",
6413 expr_as_string (BINFO_VTABLE (binfo),
6414 TFF_PLAIN_IDENTIFIER));
6418 fprintf (stream, "\n");
6421 for (i = 0; BINFO_BASE_ITERATE (binfo, i, base_binfo); i++)
6422 igo = dump_class_hierarchy_r (stream, flags, base_binfo, igo, indent + 2);
6427 /* Dump the BINFO hierarchy for T. */
6430 dump_class_hierarchy_1 (FILE *stream, int flags, tree t)
6432 fprintf (stream, "Class %s\n", type_as_string (t, TFF_PLAIN_IDENTIFIER));
6433 fprintf (stream, " size=%lu align=%lu\n",
6434 (unsigned long)(tree_low_cst (TYPE_SIZE (t), 0) / BITS_PER_UNIT),
6435 (unsigned long)(TYPE_ALIGN (t) / BITS_PER_UNIT));
6436 fprintf (stream, " base size=%lu base align=%lu\n",
6437 (unsigned long)(tree_low_cst (TYPE_SIZE (CLASSTYPE_AS_BASE (t)), 0)
6439 (unsigned long)(TYPE_ALIGN (CLASSTYPE_AS_BASE (t))
6441 dump_class_hierarchy_r (stream, flags, TYPE_BINFO (t), TYPE_BINFO (t), 0);
6442 fprintf (stream, "\n");
6445 /* Debug interface to hierarchy dumping. */
6448 debug_class (tree t)
6450 dump_class_hierarchy_1 (stderr, TDF_SLIM, t);
6454 dump_class_hierarchy (tree t)
6457 FILE *stream = dump_begin (TDI_class, &flags);
6461 dump_class_hierarchy_1 (stream, flags, t);
6462 dump_end (TDI_class, stream);
6467 dump_array (FILE * stream, tree decl)
6472 tree size = TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (decl)));
6474 elt = (tree_low_cst (TYPE_SIZE (TREE_TYPE (TREE_TYPE (decl))), 0)
6476 fprintf (stream, "%s:", decl_as_string (decl, TFF_PLAIN_IDENTIFIER));
6477 fprintf (stream, " %s entries",
6478 expr_as_string (size_binop (PLUS_EXPR, size, size_one_node),
6479 TFF_PLAIN_IDENTIFIER));
6480 fprintf (stream, "\n");
6482 for (ix = 0, inits = CONSTRUCTOR_ELTS (DECL_INITIAL (decl));
6483 inits; ix++, inits = TREE_CHAIN (inits))
6484 fprintf (stream, "%-4ld %s\n", (long)(ix * elt),
6485 expr_as_string (TREE_VALUE (inits), TFF_PLAIN_IDENTIFIER));
6489 dump_vtable (tree t, tree binfo, tree vtable)
6492 FILE *stream = dump_begin (TDI_class, &flags);
6497 if (!(flags & TDF_SLIM))
6499 int ctor_vtbl_p = TYPE_BINFO (t) != binfo;
6501 fprintf (stream, "%s for %s",
6502 ctor_vtbl_p ? "Construction vtable" : "Vtable",
6503 type_as_string (BINFO_TYPE (binfo), TFF_PLAIN_IDENTIFIER));
6506 if (!BINFO_VIRTUAL_P (binfo))
6507 fprintf (stream, " (0x%lx instance)", (unsigned long)binfo);
6508 fprintf (stream, " in %s", type_as_string (t, TFF_PLAIN_IDENTIFIER));
6510 fprintf (stream, "\n");
6511 dump_array (stream, vtable);
6512 fprintf (stream, "\n");
6515 dump_end (TDI_class, stream);
6519 dump_vtt (tree t, tree vtt)
6522 FILE *stream = dump_begin (TDI_class, &flags);
6527 if (!(flags & TDF_SLIM))
6529 fprintf (stream, "VTT for %s\n",
6530 type_as_string (t, TFF_PLAIN_IDENTIFIER));
6531 dump_array (stream, vtt);
6532 fprintf (stream, "\n");
6535 dump_end (TDI_class, stream);
6538 /* Dump a function or thunk and its thunkees. */
6541 dump_thunk (FILE *stream, int indent, tree thunk)
6543 static const char spaces[] = " ";
6544 tree name = DECL_NAME (thunk);
6547 fprintf (stream, "%.*s%p %s %s", indent, spaces,
6549 !DECL_THUNK_P (thunk) ? "function"
6550 : DECL_THIS_THUNK_P (thunk) ? "this-thunk" : "covariant-thunk",
6551 name ? IDENTIFIER_POINTER (name) : "<unset>");
6552 if (DECL_THUNK_P (thunk))
6554 HOST_WIDE_INT fixed_adjust = THUNK_FIXED_OFFSET (thunk);
6555 tree virtual_adjust = THUNK_VIRTUAL_OFFSET (thunk);
6557 fprintf (stream, " fixed=" HOST_WIDE_INT_PRINT_DEC, fixed_adjust);
6558 if (!virtual_adjust)
6560 else if (DECL_THIS_THUNK_P (thunk))
6561 fprintf (stream, " vcall=" HOST_WIDE_INT_PRINT_DEC,
6562 tree_low_cst (virtual_adjust, 0));
6564 fprintf (stream, " vbase=" HOST_WIDE_INT_PRINT_DEC "(%s)",
6565 tree_low_cst (BINFO_VPTR_FIELD (virtual_adjust), 0),
6566 type_as_string (BINFO_TYPE (virtual_adjust), TFF_SCOPE));
6567 if (THUNK_ALIAS (thunk))
6568 fprintf (stream, " alias to %p", (void *)THUNK_ALIAS (thunk));
6570 fprintf (stream, "\n");
6571 for (thunks = DECL_THUNKS (thunk); thunks; thunks = TREE_CHAIN (thunks))
6572 dump_thunk (stream, indent + 2, thunks);
6575 /* Dump the thunks for FN. */
6578 debug_thunks (tree fn)
6580 dump_thunk (stderr, 0, fn);
6583 /* Virtual function table initialization. */
6585 /* Create all the necessary vtables for T and its base classes. */
6588 finish_vtbls (tree t)
6593 /* We lay out the primary and secondary vtables in one contiguous
6594 vtable. The primary vtable is first, followed by the non-virtual
6595 secondary vtables in inheritance graph order. */
6596 list = build_tree_list (BINFO_VTABLE (TYPE_BINFO (t)), NULL_TREE);
6597 accumulate_vtbl_inits (TYPE_BINFO (t), TYPE_BINFO (t),
6598 TYPE_BINFO (t), t, list);
6600 /* Then come the virtual bases, also in inheritance graph order. */
6601 for (vbase = TYPE_BINFO (t); vbase; vbase = TREE_CHAIN (vbase))
6603 if (!BINFO_VIRTUAL_P (vbase))
6605 accumulate_vtbl_inits (vbase, vbase, TYPE_BINFO (t), t, list);
6608 if (BINFO_VTABLE (TYPE_BINFO (t)))
6609 initialize_vtable (TYPE_BINFO (t), TREE_VALUE (list));
6612 /* Initialize the vtable for BINFO with the INITS. */
6615 initialize_vtable (tree binfo, tree inits)
6619 layout_vtable_decl (binfo, list_length (inits));
6620 decl = get_vtbl_decl_for_binfo (binfo);
6621 initialize_artificial_var (decl, inits);
6622 dump_vtable (BINFO_TYPE (binfo), binfo, decl);
6625 /* Build the VTT (virtual table table) for T.
6626 A class requires a VTT if it has virtual bases.
6629 1 - primary virtual pointer for complete object T
6630 2 - secondary VTTs for each direct non-virtual base of T which requires a
6632 3 - secondary virtual pointers for each direct or indirect base of T which
6633 has virtual bases or is reachable via a virtual path from T.
6634 4 - secondary VTTs for each direct or indirect virtual base of T.
6636 Secondary VTTs look like complete object VTTs without part 4. */
6646 /* Build up the initializers for the VTT. */
6648 index = size_zero_node;
6649 build_vtt_inits (TYPE_BINFO (t), t, &inits, &index);
6651 /* If we didn't need a VTT, we're done. */
6655 /* Figure out the type of the VTT. */
6656 type = build_index_type (size_int (list_length (inits) - 1));
6657 type = build_cplus_array_type (const_ptr_type_node, type);
6659 /* Now, build the VTT object itself. */
6660 vtt = build_vtable (t, get_vtt_name (t), type);
6661 initialize_artificial_var (vtt, inits);
6662 /* Add the VTT to the vtables list. */
6663 TREE_CHAIN (vtt) = TREE_CHAIN (CLASSTYPE_VTABLES (t));
6664 TREE_CHAIN (CLASSTYPE_VTABLES (t)) = vtt;
6669 /* When building a secondary VTT, BINFO_VTABLE is set to a TREE_LIST with
6670 PURPOSE the RTTI_BINFO, VALUE the real vtable pointer for this binfo,
6671 and CHAIN the vtable pointer for this binfo after construction is
6672 complete. VALUE can also be another BINFO, in which case we recurse. */
6675 binfo_ctor_vtable (tree binfo)
6681 vt = BINFO_VTABLE (binfo);
6682 if (TREE_CODE (vt) == TREE_LIST)
6683 vt = TREE_VALUE (vt);
6684 if (TREE_CODE (vt) == TREE_BINFO)
6693 /* Data for secondary VTT initialization. */
6694 typedef struct secondary_vptr_vtt_init_data_s
6696 /* Is this the primary VTT? */
6699 /* Current index into the VTT. */
6702 /* TREE_LIST of initializers built up. */
6705 /* The type being constructed by this secondary VTT. */
6706 tree type_being_constructed;
6707 } secondary_vptr_vtt_init_data;
6709 /* Recursively build the VTT-initializer for BINFO (which is in the
6710 hierarchy dominated by T). INITS points to the end of the initializer
6711 list to date. INDEX is the VTT index where the next element will be
6712 replaced. Iff BINFO is the binfo for T, this is the top level VTT (i.e.
6713 not a subvtt for some base of T). When that is so, we emit the sub-VTTs
6714 for virtual bases of T. When it is not so, we build the constructor
6715 vtables for the BINFO-in-T variant. */
6718 build_vtt_inits (tree binfo, tree t, tree *inits, tree *index)
6723 tree secondary_vptrs;
6724 secondary_vptr_vtt_init_data data;
6725 int top_level_p = SAME_BINFO_TYPE_P (BINFO_TYPE (binfo), t);
6727 /* We only need VTTs for subobjects with virtual bases. */
6728 if (!CLASSTYPE_VBASECLASSES (BINFO_TYPE (binfo)))
6731 /* We need to use a construction vtable if this is not the primary
6735 build_ctor_vtbl_group (binfo, t);
6737 /* Record the offset in the VTT where this sub-VTT can be found. */
6738 BINFO_SUBVTT_INDEX (binfo) = *index;
6741 /* Add the address of the primary vtable for the complete object. */
6742 init = binfo_ctor_vtable (binfo);
6743 *inits = build_tree_list (NULL_TREE, init);
6744 inits = &TREE_CHAIN (*inits);
6747 gcc_assert (!BINFO_VPTR_INDEX (binfo));
6748 BINFO_VPTR_INDEX (binfo) = *index;
6750 *index = size_binop (PLUS_EXPR, *index, TYPE_SIZE_UNIT (ptr_type_node));
6752 /* Recursively add the secondary VTTs for non-virtual bases. */
6753 for (i = 0; BINFO_BASE_ITERATE (binfo, i, b); ++i)
6754 if (!BINFO_VIRTUAL_P (b))
6755 inits = build_vtt_inits (b, t, inits, index);
6757 /* Add secondary virtual pointers for all subobjects of BINFO with
6758 either virtual bases or reachable along a virtual path, except
6759 subobjects that are non-virtual primary bases. */
6760 data.top_level_p = top_level_p;
6761 data.index = *index;
6763 data.type_being_constructed = BINFO_TYPE (binfo);
6765 dfs_walk_once (binfo, dfs_build_secondary_vptr_vtt_inits, NULL, &data);
6767 *index = data.index;
6769 /* The secondary vptrs come back in reverse order. After we reverse
6770 them, and add the INITS, the last init will be the first element
6772 secondary_vptrs = data.inits;
6773 if (secondary_vptrs)
6775 *inits = nreverse (secondary_vptrs);
6776 inits = &TREE_CHAIN (secondary_vptrs);
6777 gcc_assert (*inits == NULL_TREE);
6781 /* Add the secondary VTTs for virtual bases in inheritance graph
6783 for (b = TYPE_BINFO (BINFO_TYPE (binfo)); b; b = TREE_CHAIN (b))
6785 if (!BINFO_VIRTUAL_P (b))
6788 inits = build_vtt_inits (b, t, inits, index);
6791 /* Remove the ctor vtables we created. */
6792 dfs_walk_all (binfo, dfs_fixup_binfo_vtbls, NULL, binfo);
6797 /* Called from build_vtt_inits via dfs_walk. BINFO is the binfo for the base
6798 in most derived. DATA is a SECONDARY_VPTR_VTT_INIT_DATA structure. */
6801 dfs_build_secondary_vptr_vtt_inits (tree binfo, void *data_)
6803 secondary_vptr_vtt_init_data *data = (secondary_vptr_vtt_init_data *)data_;
6805 /* We don't care about bases that don't have vtables. */
6806 if (!TYPE_VFIELD (BINFO_TYPE (binfo)))
6807 return dfs_skip_bases;
6809 /* We're only interested in proper subobjects of the type being
6811 if (SAME_BINFO_TYPE_P (BINFO_TYPE (binfo), data->type_being_constructed))
6814 /* We're only interested in bases with virtual bases or reachable
6815 via a virtual path from the type being constructed. */
6816 if (!(CLASSTYPE_VBASECLASSES (BINFO_TYPE (binfo))
6817 || binfo_via_virtual (binfo, data->type_being_constructed)))
6818 return dfs_skip_bases;
6820 /* We're not interested in non-virtual primary bases. */
6821 if (!BINFO_VIRTUAL_P (binfo) && BINFO_PRIMARY_P (binfo))
6824 /* Record the index where this secondary vptr can be found. */
6825 if (data->top_level_p)
6827 gcc_assert (!BINFO_VPTR_INDEX (binfo));
6828 BINFO_VPTR_INDEX (binfo) = data->index;
6830 if (BINFO_VIRTUAL_P (binfo))
6832 /* It's a primary virtual base, and this is not a
6833 construction vtable. Find the base this is primary of in
6834 the inheritance graph, and use that base's vtable
6836 while (BINFO_PRIMARY_P (binfo))
6837 binfo = BINFO_INHERITANCE_CHAIN (binfo);
6841 /* Add the initializer for the secondary vptr itself. */
6842 data->inits = tree_cons (NULL_TREE, binfo_ctor_vtable (binfo), data->inits);
6844 /* Advance the vtt index. */
6845 data->index = size_binop (PLUS_EXPR, data->index,
6846 TYPE_SIZE_UNIT (ptr_type_node));
6851 /* Called from build_vtt_inits via dfs_walk. After building
6852 constructor vtables and generating the sub-vtt from them, we need
6853 to restore the BINFO_VTABLES that were scribbled on. DATA is the
6854 binfo of the base whose sub vtt was generated. */
6857 dfs_fixup_binfo_vtbls (tree binfo, void* data)
6859 tree vtable = BINFO_VTABLE (binfo);
6861 if (!TYPE_CONTAINS_VPTR_P (BINFO_TYPE (binfo)))
6862 /* If this class has no vtable, none of its bases do. */
6863 return dfs_skip_bases;
6866 /* This might be a primary base, so have no vtable in this
6870 /* If we scribbled the construction vtable vptr into BINFO, clear it
6872 if (TREE_CODE (vtable) == TREE_LIST
6873 && (TREE_PURPOSE (vtable) == (tree) data))
6874 BINFO_VTABLE (binfo) = TREE_CHAIN (vtable);
6879 /* Build the construction vtable group for BINFO which is in the
6880 hierarchy dominated by T. */
6883 build_ctor_vtbl_group (tree binfo, tree t)
6892 /* See if we've already created this construction vtable group. */
6893 id = mangle_ctor_vtbl_for_type (t, binfo);
6894 if (IDENTIFIER_GLOBAL_VALUE (id))
6897 gcc_assert (!SAME_BINFO_TYPE_P (BINFO_TYPE (binfo), t));
6898 /* Build a version of VTBL (with the wrong type) for use in
6899 constructing the addresses of secondary vtables in the
6900 construction vtable group. */
6901 vtbl = build_vtable (t, id, ptr_type_node);
6902 DECL_CONSTRUCTION_VTABLE_P (vtbl) = 1;
6903 list = build_tree_list (vtbl, NULL_TREE);
6904 accumulate_vtbl_inits (binfo, TYPE_BINFO (TREE_TYPE (binfo)),
6907 /* Add the vtables for each of our virtual bases using the vbase in T
6909 for (vbase = TYPE_BINFO (BINFO_TYPE (binfo));
6911 vbase = TREE_CHAIN (vbase))
6915 if (!BINFO_VIRTUAL_P (vbase))
6917 b = copied_binfo (vbase, binfo);
6919 accumulate_vtbl_inits (b, vbase, binfo, t, list);
6921 inits = TREE_VALUE (list);
6923 /* Figure out the type of the construction vtable. */
6924 type = build_index_type (size_int (list_length (inits) - 1));
6925 type = build_cplus_array_type (vtable_entry_type, type);
6926 TREE_TYPE (vtbl) = type;
6928 /* Initialize the construction vtable. */
6929 CLASSTYPE_VTABLES (t) = chainon (CLASSTYPE_VTABLES (t), vtbl);
6930 initialize_artificial_var (vtbl, inits);
6931 dump_vtable (t, binfo, vtbl);
6934 /* Add the vtbl initializers for BINFO (and its bases other than
6935 non-virtual primaries) to the list of INITS. BINFO is in the
6936 hierarchy dominated by T. RTTI_BINFO is the binfo within T of
6937 the constructor the vtbl inits should be accumulated for. (If this
6938 is the complete object vtbl then RTTI_BINFO will be TYPE_BINFO (T).)
6939 ORIG_BINFO is the binfo for this object within BINFO_TYPE (RTTI_BINFO).
6940 BINFO is the active base equivalent of ORIG_BINFO in the inheritance
6941 graph of T. Both BINFO and ORIG_BINFO will have the same BINFO_TYPE,
6942 but are not necessarily the same in terms of layout. */
6945 accumulate_vtbl_inits (tree binfo,
6953 int ctor_vtbl_p = !SAME_BINFO_TYPE_P (BINFO_TYPE (rtti_binfo), t);
6955 gcc_assert (SAME_BINFO_TYPE_P (BINFO_TYPE (binfo), BINFO_TYPE (orig_binfo)));
6957 /* If it doesn't have a vptr, we don't do anything. */
6958 if (!TYPE_CONTAINS_VPTR_P (BINFO_TYPE (binfo)))
6961 /* If we're building a construction vtable, we're not interested in
6962 subobjects that don't require construction vtables. */
6964 && !CLASSTYPE_VBASECLASSES (BINFO_TYPE (binfo))
6965 && !binfo_via_virtual (orig_binfo, BINFO_TYPE (rtti_binfo)))
6968 /* Build the initializers for the BINFO-in-T vtable. */
6970 = chainon (TREE_VALUE (inits),
6971 dfs_accumulate_vtbl_inits (binfo, orig_binfo,
6972 rtti_binfo, t, inits));
6974 /* Walk the BINFO and its bases. We walk in preorder so that as we
6975 initialize each vtable we can figure out at what offset the
6976 secondary vtable lies from the primary vtable. We can't use
6977 dfs_walk here because we need to iterate through bases of BINFO
6978 and RTTI_BINFO simultaneously. */
6979 for (i = 0; BINFO_BASE_ITERATE (binfo, i, base_binfo); ++i)
6981 /* Skip virtual bases. */
6982 if (BINFO_VIRTUAL_P (base_binfo))
6984 accumulate_vtbl_inits (base_binfo,
6985 BINFO_BASE_BINFO (orig_binfo, i),
6991 /* Called from accumulate_vtbl_inits. Returns the initializers for
6992 the BINFO vtable. */
6995 dfs_accumulate_vtbl_inits (tree binfo,
7001 tree inits = NULL_TREE;
7002 tree vtbl = NULL_TREE;
7003 int ctor_vtbl_p = !SAME_BINFO_TYPE_P (BINFO_TYPE (rtti_binfo), t);
7006 && BINFO_VIRTUAL_P (orig_binfo) && BINFO_PRIMARY_P (orig_binfo))
7008 /* In the hierarchy of BINFO_TYPE (RTTI_BINFO), this is a
7009 primary virtual base. If it is not the same primary in
7010 the hierarchy of T, we'll need to generate a ctor vtable
7011 for it, to place at its location in T. If it is the same
7012 primary, we still need a VTT entry for the vtable, but it
7013 should point to the ctor vtable for the base it is a
7014 primary for within the sub-hierarchy of RTTI_BINFO.
7016 There are three possible cases:
7018 1) We are in the same place.
7019 2) We are a primary base within a lost primary virtual base of
7021 3) We are primary to something not a base of RTTI_BINFO. */
7024 tree last = NULL_TREE;
7026 /* First, look through the bases we are primary to for RTTI_BINFO
7027 or a virtual base. */
7029 while (BINFO_PRIMARY_P (b))
7031 b = BINFO_INHERITANCE_CHAIN (b);
7033 if (BINFO_VIRTUAL_P (b) || b == rtti_binfo)
7036 /* If we run out of primary links, keep looking down our
7037 inheritance chain; we might be an indirect primary. */
7038 for (b = last; b; b = BINFO_INHERITANCE_CHAIN (b))
7039 if (BINFO_VIRTUAL_P (b) || b == rtti_binfo)
7043 /* If we found RTTI_BINFO, this is case 1. If we found a virtual
7044 base B and it is a base of RTTI_BINFO, this is case 2. In
7045 either case, we share our vtable with LAST, i.e. the
7046 derived-most base within B of which we are a primary. */
7048 || (b && binfo_for_vbase (BINFO_TYPE (b), BINFO_TYPE (rtti_binfo))))
7049 /* Just set our BINFO_VTABLE to point to LAST, as we may not have
7050 set LAST's BINFO_VTABLE yet. We'll extract the actual vptr in
7051 binfo_ctor_vtable after everything's been set up. */
7054 /* Otherwise, this is case 3 and we get our own. */
7056 else if (!BINFO_NEW_VTABLE_MARKED (orig_binfo))
7064 /* Compute the initializer for this vtable. */
7065 inits = build_vtbl_initializer (binfo, orig_binfo, t, rtti_binfo,
7068 /* Figure out the position to which the VPTR should point. */
7069 vtbl = TREE_PURPOSE (l);
7070 vtbl = build1 (ADDR_EXPR, vtbl_ptr_type_node, vtbl);
7071 index = size_binop (PLUS_EXPR,
7072 size_int (non_fn_entries),
7073 size_int (list_length (TREE_VALUE (l))));
7074 index = size_binop (MULT_EXPR,
7075 TYPE_SIZE_UNIT (vtable_entry_type),
7077 vtbl = build2 (PLUS_EXPR, TREE_TYPE (vtbl), vtbl, index);
7081 /* For a construction vtable, we can't overwrite BINFO_VTABLE.
7082 So, we make a TREE_LIST. Later, dfs_fixup_binfo_vtbls will
7083 straighten this out. */
7084 BINFO_VTABLE (binfo) = tree_cons (rtti_binfo, vtbl, BINFO_VTABLE (binfo));
7085 else if (BINFO_PRIMARY_P (binfo) && BINFO_VIRTUAL_P (binfo))
7088 /* For an ordinary vtable, set BINFO_VTABLE. */
7089 BINFO_VTABLE (binfo) = vtbl;
7094 /* Construct the initializer for BINFO's virtual function table. BINFO
7095 is part of the hierarchy dominated by T. If we're building a
7096 construction vtable, the ORIG_BINFO is the binfo we should use to
7097 find the actual function pointers to put in the vtable - but they
7098 can be overridden on the path to most-derived in the graph that
7099 ORIG_BINFO belongs. Otherwise,
7100 ORIG_BINFO should be the same as BINFO. The RTTI_BINFO is the
7101 BINFO that should be indicated by the RTTI information in the
7102 vtable; it will be a base class of T, rather than T itself, if we
7103 are building a construction vtable.
7105 The value returned is a TREE_LIST suitable for wrapping in a
7106 CONSTRUCTOR to use as the DECL_INITIAL for a vtable. If
7107 NON_FN_ENTRIES_P is not NULL, *NON_FN_ENTRIES_P is set to the
7108 number of non-function entries in the vtable.
7110 It might seem that this function should never be called with a
7111 BINFO for which BINFO_PRIMARY_P holds, the vtable for such a
7112 base is always subsumed by a derived class vtable. However, when
7113 we are building construction vtables, we do build vtables for
7114 primary bases; we need these while the primary base is being
7118 build_vtbl_initializer (tree binfo,
7122 int* non_fn_entries_p)
7131 /* Initialize VID. */
7132 memset (&vid, 0, sizeof (vid));
7135 vid.rtti_binfo = rtti_binfo;
7136 vid.last_init = &vid.inits;
7137 vid.primary_vtbl_p = SAME_BINFO_TYPE_P (BINFO_TYPE (binfo), t);
7138 vid.ctor_vtbl_p = !SAME_BINFO_TYPE_P (BINFO_TYPE (rtti_binfo), t);
7139 vid.generate_vcall_entries = true;
7140 /* The first vbase or vcall offset is at index -3 in the vtable. */
7141 vid.index = ssize_int(-3 * TARGET_VTABLE_DATA_ENTRY_DISTANCE);
7143 /* Add entries to the vtable for RTTI. */
7144 build_rtti_vtbl_entries (binfo, &vid);
7146 /* Create an array for keeping track of the functions we've
7147 processed. When we see multiple functions with the same
7148 signature, we share the vcall offsets. */
7149 VARRAY_TREE_INIT (vid.fns, 32, "fns");
7150 /* Add the vcall and vbase offset entries. */
7151 build_vcall_and_vbase_vtbl_entries (binfo, &vid);
7153 /* Clear BINFO_VTABLE_PATH_MARKED; it's set by
7154 build_vbase_offset_vtbl_entries. */
7155 for (vbases = CLASSTYPE_VBASECLASSES (t), ix = 0;
7156 VEC_iterate (tree, vbases, ix, vbinfo); ix++)
7157 BINFO_VTABLE_PATH_MARKED (vbinfo) = 0;
7159 /* If the target requires padding between data entries, add that now. */
7160 if (TARGET_VTABLE_DATA_ENTRY_DISTANCE > 1)
7164 for (prev = &vid.inits; (cur = *prev); prev = &TREE_CHAIN (cur))
7169 for (i = 1; i < TARGET_VTABLE_DATA_ENTRY_DISTANCE; ++i)
7170 add = tree_cons (NULL_TREE,
7171 build1 (NOP_EXPR, vtable_entry_type,
7178 if (non_fn_entries_p)
7179 *non_fn_entries_p = list_length (vid.inits);
7181 /* Go through all the ordinary virtual functions, building up
7183 vfun_inits = NULL_TREE;
7184 for (v = BINFO_VIRTUALS (orig_binfo); v; v = TREE_CHAIN (v))
7188 tree fn, fn_original;
7189 tree init = NULL_TREE;
7193 if (DECL_THUNK_P (fn))
7195 if (!DECL_NAME (fn))
7197 if (THUNK_ALIAS (fn))
7199 fn = THUNK_ALIAS (fn);
7202 fn_original = THUNK_TARGET (fn);
7205 /* If the only definition of this function signature along our
7206 primary base chain is from a lost primary, this vtable slot will
7207 never be used, so just zero it out. This is important to avoid
7208 requiring extra thunks which cannot be generated with the function.
7210 We first check this in update_vtable_entry_for_fn, so we handle
7211 restored primary bases properly; we also need to do it here so we
7212 zero out unused slots in ctor vtables, rather than filling themff
7213 with erroneous values (though harmless, apart from relocation
7215 for (b = binfo; ; b = get_primary_binfo (b))
7217 /* We found a defn before a lost primary; go ahead as normal. */
7218 if (look_for_overrides_here (BINFO_TYPE (b), fn_original))
7221 /* The nearest definition is from a lost primary; clear the
7223 if (BINFO_LOST_PRIMARY_P (b))
7225 init = size_zero_node;
7232 /* Pull the offset for `this', and the function to call, out of
7234 delta = BV_DELTA (v);
7235 vcall_index = BV_VCALL_INDEX (v);
7237 gcc_assert (TREE_CODE (delta) == INTEGER_CST);
7238 gcc_assert (TREE_CODE (fn) == FUNCTION_DECL);
7240 /* You can't call an abstract virtual function; it's abstract.
7241 So, we replace these functions with __pure_virtual. */
7242 if (DECL_PURE_VIRTUAL_P (fn_original))
7244 else if (!integer_zerop (delta) || vcall_index)
7246 fn = make_thunk (fn, /*this_adjusting=*/1, delta, vcall_index);
7247 if (!DECL_NAME (fn))
7250 /* Take the address of the function, considering it to be of an
7251 appropriate generic type. */
7252 init = build1 (ADDR_EXPR, vfunc_ptr_type_node, fn);
7255 /* And add it to the chain of initializers. */
7256 if (TARGET_VTABLE_USES_DESCRIPTORS)
7259 if (init == size_zero_node)
7260 for (i = 0; i < TARGET_VTABLE_USES_DESCRIPTORS; ++i)
7261 vfun_inits = tree_cons (NULL_TREE, init, vfun_inits);
7263 for (i = 0; i < TARGET_VTABLE_USES_DESCRIPTORS; ++i)
7265 tree fdesc = build2 (FDESC_EXPR, vfunc_ptr_type_node,
7266 TREE_OPERAND (init, 0),
7267 build_int_cst (NULL_TREE, i));
7268 TREE_CONSTANT (fdesc) = 1;
7269 TREE_INVARIANT (fdesc) = 1;
7271 vfun_inits = tree_cons (NULL_TREE, fdesc, vfun_inits);
7275 vfun_inits = tree_cons (NULL_TREE, init, vfun_inits);
7278 /* The initializers for virtual functions were built up in reverse
7279 order; straighten them out now. */
7280 vfun_inits = nreverse (vfun_inits);
7282 /* The negative offset initializers are also in reverse order. */
7283 vid.inits = nreverse (vid.inits);
7285 /* Chain the two together. */
7286 return chainon (vid.inits, vfun_inits);
7289 /* Adds to vid->inits the initializers for the vbase and vcall
7290 offsets in BINFO, which is in the hierarchy dominated by T. */
7293 build_vcall_and_vbase_vtbl_entries (tree binfo, vtbl_init_data* vid)
7297 /* If this is a derived class, we must first create entries
7298 corresponding to the primary base class. */
7299 b = get_primary_binfo (binfo);
7301 build_vcall_and_vbase_vtbl_entries (b, vid);
7303 /* Add the vbase entries for this base. */
7304 build_vbase_offset_vtbl_entries (binfo, vid);
7305 /* Add the vcall entries for this base. */
7306 build_vcall_offset_vtbl_entries (binfo, vid);
7309 /* Returns the initializers for the vbase offset entries in the vtable
7310 for BINFO (which is part of the class hierarchy dominated by T), in
7311 reverse order. VBASE_OFFSET_INDEX gives the vtable index
7312 where the next vbase offset will go. */
7315 build_vbase_offset_vtbl_entries (tree binfo, vtbl_init_data* vid)
7319 tree non_primary_binfo;
7321 /* If there are no virtual baseclasses, then there is nothing to
7323 if (!CLASSTYPE_VBASECLASSES (BINFO_TYPE (binfo)))
7328 /* We might be a primary base class. Go up the inheritance hierarchy
7329 until we find the most derived class of which we are a primary base:
7330 it is the offset of that which we need to use. */
7331 non_primary_binfo = binfo;
7332 while (BINFO_INHERITANCE_CHAIN (non_primary_binfo))
7336 /* If we have reached a virtual base, then it must be a primary
7337 base (possibly multi-level) of vid->binfo, or we wouldn't
7338 have called build_vcall_and_vbase_vtbl_entries for it. But it
7339 might be a lost primary, so just skip down to vid->binfo. */
7340 if (BINFO_VIRTUAL_P (non_primary_binfo))
7342 non_primary_binfo = vid->binfo;
7346 b = BINFO_INHERITANCE_CHAIN (non_primary_binfo);
7347 if (get_primary_binfo (b) != non_primary_binfo)
7349 non_primary_binfo = b;
7352 /* Go through the virtual bases, adding the offsets. */
7353 for (vbase = TYPE_BINFO (BINFO_TYPE (binfo));
7355 vbase = TREE_CHAIN (vbase))
7360 if (!BINFO_VIRTUAL_P (vbase))
7363 /* Find the instance of this virtual base in the complete
7365 b = copied_binfo (vbase, binfo);
7367 /* If we've already got an offset for this virtual base, we
7368 don't need another one. */
7369 if (BINFO_VTABLE_PATH_MARKED (b))
7371 BINFO_VTABLE_PATH_MARKED (b) = 1;
7373 /* Figure out where we can find this vbase offset. */
7374 delta = size_binop (MULT_EXPR,
7377 TYPE_SIZE_UNIT (vtable_entry_type)));
7378 if (vid->primary_vtbl_p)
7379 BINFO_VPTR_FIELD (b) = delta;
7381 if (binfo != TYPE_BINFO (t))
7382 /* The vbase offset had better be the same. */
7383 gcc_assert (tree_int_cst_equal (delta, BINFO_VPTR_FIELD (vbase)));
7385 /* The next vbase will come at a more negative offset. */
7386 vid->index = size_binop (MINUS_EXPR, vid->index,
7387 ssize_int (TARGET_VTABLE_DATA_ENTRY_DISTANCE));
7389 /* The initializer is the delta from BINFO to this virtual base.
7390 The vbase offsets go in reverse inheritance-graph order, and
7391 we are walking in inheritance graph order so these end up in
7393 delta = size_diffop (BINFO_OFFSET (b), BINFO_OFFSET (non_primary_binfo));
7396 = build_tree_list (NULL_TREE,
7397 fold (build1 (NOP_EXPR,
7400 vid->last_init = &TREE_CHAIN (*vid->last_init);
7404 /* Adds the initializers for the vcall offset entries in the vtable
7405 for BINFO (which is part of the class hierarchy dominated by VID->DERIVED)
7409 build_vcall_offset_vtbl_entries (tree binfo, vtbl_init_data* vid)
7411 /* We only need these entries if this base is a virtual base. We
7412 compute the indices -- but do not add to the vtable -- when
7413 building the main vtable for a class. */
7414 if (BINFO_VIRTUAL_P (binfo) || binfo == TYPE_BINFO (vid->derived))
7416 /* We need a vcall offset for each of the virtual functions in this
7417 vtable. For example:
7419 class A { virtual void f (); };
7420 class B1 : virtual public A { virtual void f (); };
7421 class B2 : virtual public A { virtual void f (); };
7422 class C: public B1, public B2 { virtual void f (); };
7424 A C object has a primary base of B1, which has a primary base of A. A
7425 C also has a secondary base of B2, which no longer has a primary base
7426 of A. So the B2-in-C construction vtable needs a secondary vtable for
7427 A, which will adjust the A* to a B2* to call f. We have no way of
7428 knowing what (or even whether) this offset will be when we define B2,
7429 so we store this "vcall offset" in the A sub-vtable and look it up in
7430 a "virtual thunk" for B2::f.
7432 We need entries for all the functions in our primary vtable and
7433 in our non-virtual bases' secondary vtables. */
7435 /* If we are just computing the vcall indices -- but do not need
7436 the actual entries -- not that. */
7437 if (!BINFO_VIRTUAL_P (binfo))
7438 vid->generate_vcall_entries = false;
7439 /* Now, walk through the non-virtual bases, adding vcall offsets. */
7440 add_vcall_offset_vtbl_entries_r (binfo, vid);
7444 /* Build vcall offsets, starting with those for BINFO. */
7447 add_vcall_offset_vtbl_entries_r (tree binfo, vtbl_init_data* vid)
7453 /* Don't walk into virtual bases -- except, of course, for the
7454 virtual base for which we are building vcall offsets. Any
7455 primary virtual base will have already had its offsets generated
7456 through the recursion in build_vcall_and_vbase_vtbl_entries. */
7457 if (BINFO_VIRTUAL_P (binfo) && vid->vbase != binfo)
7460 /* If BINFO has a primary base, process it first. */
7461 primary_binfo = get_primary_binfo (binfo);
7463 add_vcall_offset_vtbl_entries_r (primary_binfo, vid);
7465 /* Add BINFO itself to the list. */
7466 add_vcall_offset_vtbl_entries_1 (binfo, vid);
7468 /* Scan the non-primary bases of BINFO. */
7469 for (i = 0; BINFO_BASE_ITERATE (binfo, i, base_binfo); ++i)
7470 if (base_binfo != primary_binfo)
7471 add_vcall_offset_vtbl_entries_r (base_binfo, vid);
7474 /* Called from build_vcall_offset_vtbl_entries_r. */
7477 add_vcall_offset_vtbl_entries_1 (tree binfo, vtbl_init_data* vid)
7479 /* Make entries for the rest of the virtuals. */
7480 if (abi_version_at_least (2))
7484 /* The ABI requires that the methods be processed in declaration
7485 order. G++ 3.2 used the order in the vtable. */
7486 for (orig_fn = TYPE_METHODS (BINFO_TYPE (binfo));
7488 orig_fn = TREE_CHAIN (orig_fn))
7489 if (DECL_VINDEX (orig_fn))
7490 add_vcall_offset (orig_fn, binfo, vid);
7494 tree derived_virtuals;
7497 /* If BINFO is a primary base, the most derived class which has
7498 BINFO as a primary base; otherwise, just BINFO. */
7499 tree non_primary_binfo;
7501 /* We might be a primary base class. Go up the inheritance hierarchy
7502 until we find the most derived class of which we are a primary base:
7503 it is the BINFO_VIRTUALS there that we need to consider. */
7504 non_primary_binfo = binfo;
7505 while (BINFO_INHERITANCE_CHAIN (non_primary_binfo))
7509 /* If we have reached a virtual base, then it must be vid->vbase,
7510 because we ignore other virtual bases in
7511 add_vcall_offset_vtbl_entries_r. In turn, it must be a primary
7512 base (possibly multi-level) of vid->binfo, or we wouldn't
7513 have called build_vcall_and_vbase_vtbl_entries for it. But it
7514 might be a lost primary, so just skip down to vid->binfo. */
7515 if (BINFO_VIRTUAL_P (non_primary_binfo))
7517 gcc_assert (non_primary_binfo == vid->vbase);
7518 non_primary_binfo = vid->binfo;
7522 b = BINFO_INHERITANCE_CHAIN (non_primary_binfo);
7523 if (get_primary_binfo (b) != non_primary_binfo)
7525 non_primary_binfo = b;
7528 if (vid->ctor_vtbl_p)
7529 /* For a ctor vtable we need the equivalent binfo within the hierarchy
7530 where rtti_binfo is the most derived type. */
7532 = original_binfo (non_primary_binfo, vid->rtti_binfo);
7534 for (base_virtuals = BINFO_VIRTUALS (binfo),
7535 derived_virtuals = BINFO_VIRTUALS (non_primary_binfo),
7536 orig_virtuals = BINFO_VIRTUALS (TYPE_BINFO (BINFO_TYPE (binfo)));
7538 base_virtuals = TREE_CHAIN (base_virtuals),
7539 derived_virtuals = TREE_CHAIN (derived_virtuals),
7540 orig_virtuals = TREE_CHAIN (orig_virtuals))
7544 /* Find the declaration that originally caused this function to
7545 be present in BINFO_TYPE (binfo). */
7546 orig_fn = BV_FN (orig_virtuals);
7548 /* When processing BINFO, we only want to generate vcall slots for
7549 function slots introduced in BINFO. So don't try to generate
7550 one if the function isn't even defined in BINFO. */
7551 if (!SAME_BINFO_TYPE_P (BINFO_TYPE (binfo), DECL_CONTEXT (orig_fn)))
7554 add_vcall_offset (orig_fn, binfo, vid);
7559 /* Add a vcall offset entry for ORIG_FN to the vtable. */
7562 add_vcall_offset (tree orig_fn, tree binfo, vtbl_init_data *vid)
7567 /* If there is already an entry for a function with the same
7568 signature as FN, then we do not need a second vcall offset.
7569 Check the list of functions already present in the derived
7571 for (i = 0; i < VARRAY_ACTIVE_SIZE (vid->fns); ++i)
7575 derived_entry = VARRAY_TREE (vid->fns, i);
7576 if (same_signature_p (derived_entry, orig_fn)
7577 /* We only use one vcall offset for virtual destructors,
7578 even though there are two virtual table entries. */
7579 || (DECL_DESTRUCTOR_P (derived_entry)
7580 && DECL_DESTRUCTOR_P (orig_fn)))
7584 /* If we are building these vcall offsets as part of building
7585 the vtable for the most derived class, remember the vcall
7587 if (vid->binfo == TYPE_BINFO (vid->derived))
7589 tree_pair_p elt = VEC_safe_push (tree_pair_s,
7590 CLASSTYPE_VCALL_INDICES (vid->derived),
7592 elt->purpose = orig_fn;
7593 elt->value = vid->index;
7596 /* The next vcall offset will be found at a more negative
7598 vid->index = size_binop (MINUS_EXPR, vid->index,
7599 ssize_int (TARGET_VTABLE_DATA_ENTRY_DISTANCE));
7601 /* Keep track of this function. */
7602 VARRAY_PUSH_TREE (vid->fns, orig_fn);
7604 if (vid->generate_vcall_entries)
7609 /* Find the overriding function. */
7610 fn = find_final_overrider (vid->rtti_binfo, binfo, orig_fn);
7611 if (fn == error_mark_node)
7612 vcall_offset = build1 (NOP_EXPR, vtable_entry_type,
7616 base = TREE_VALUE (fn);
7618 /* The vbase we're working on is a primary base of
7619 vid->binfo. But it might be a lost primary, so its
7620 BINFO_OFFSET might be wrong, so we just use the
7621 BINFO_OFFSET from vid->binfo. */
7622 vcall_offset = size_diffop (BINFO_OFFSET (base),
7623 BINFO_OFFSET (vid->binfo));
7624 vcall_offset = fold (build1 (NOP_EXPR, vtable_entry_type,
7627 /* Add the initializer to the vtable. */
7628 *vid->last_init = build_tree_list (NULL_TREE, vcall_offset);
7629 vid->last_init = &TREE_CHAIN (*vid->last_init);
7633 /* Return vtbl initializers for the RTTI entries corresponding to the
7634 BINFO's vtable. The RTTI entries should indicate the object given
7635 by VID->rtti_binfo. */
7638 build_rtti_vtbl_entries (tree binfo, vtbl_init_data* vid)
7647 basetype = BINFO_TYPE (binfo);
7648 t = BINFO_TYPE (vid->rtti_binfo);
7650 /* To find the complete object, we will first convert to our most
7651 primary base, and then add the offset in the vtbl to that value. */
7653 while (CLASSTYPE_HAS_PRIMARY_BASE_P (BINFO_TYPE (b))
7654 && !BINFO_LOST_PRIMARY_P (b))
7658 primary_base = get_primary_binfo (b);
7659 gcc_assert (BINFO_PRIMARY_P (primary_base)
7660 && BINFO_INHERITANCE_CHAIN (primary_base) == b);
7663 offset = size_diffop (BINFO_OFFSET (vid->rtti_binfo), BINFO_OFFSET (b));
7665 /* The second entry is the address of the typeinfo object. */
7667 decl = build_address (get_tinfo_decl (t));
7669 decl = integer_zero_node;
7671 /* Convert the declaration to a type that can be stored in the
7673 init = build_nop (vfunc_ptr_type_node, decl);
7674 *vid->last_init = build_tree_list (NULL_TREE, init);
7675 vid->last_init = &TREE_CHAIN (*vid->last_init);
7677 /* Add the offset-to-top entry. It comes earlier in the vtable that
7678 the the typeinfo entry. Convert the offset to look like a
7679 function pointer, so that we can put it in the vtable. */
7680 init = build_nop (vfunc_ptr_type_node, offset);
7681 *vid->last_init = build_tree_list (NULL_TREE, init);
7682 vid->last_init = &TREE_CHAIN (*vid->last_init);
7685 /* Fold a OBJ_TYPE_REF expression to the address of a function.
7686 KNOWN_TYPE carries the true type of OBJ_TYPE_REF_OBJECT(REF). */
7689 cp_fold_obj_type_ref (tree ref, tree known_type)
7691 HOST_WIDE_INT index = tree_low_cst (OBJ_TYPE_REF_TOKEN (ref), 1);
7692 HOST_WIDE_INT i = 0;
7693 tree v = BINFO_VIRTUALS (TYPE_BINFO (known_type));
7698 i += (TARGET_VTABLE_USES_DESCRIPTORS
7699 ? TARGET_VTABLE_USES_DESCRIPTORS : 1);
7705 #ifdef ENABLE_CHECKING
7706 gcc_assert (tree_int_cst_equal (OBJ_TYPE_REF_TOKEN (ref),
7707 DECL_VINDEX (fndecl)));
7710 return build_address (fndecl);