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. */
299 tree zero = cp_convert (TREE_TYPE (expr), integer_zero_node);
300 null_test = fold (build2 (NE_EXPR, boolean_type_node,
304 /* If this is a simple base reference, express it as a COMPONENT_REF. */
305 if (code == PLUS_EXPR && !virtual_access
306 /* We don't build base fields for empty bases, and they aren't very
307 interesting to the optimizers anyway. */
310 expr = build_indirect_ref (expr, NULL);
311 expr = build_simple_base_path (expr, binfo);
313 expr = build_address (expr);
314 target_type = TREE_TYPE (expr);
320 /* Going via virtual base V_BINFO. We need the static offset
321 from V_BINFO to BINFO, and the dynamic offset from D_BINFO to
322 V_BINFO. That offset is an entry in D_BINFO's vtable. */
325 if (fixed_type_p < 0 && in_base_initializer)
327 /* In a base member initializer, we cannot rely on
328 the vtable being set up. We have to use the vtt_parm. */
329 tree derived = BINFO_INHERITANCE_CHAIN (v_binfo);
332 t = TREE_TYPE (TYPE_VFIELD (BINFO_TYPE (derived)));
333 t = build_pointer_type (t);
334 v_offset = convert (t, current_vtt_parm);
335 v_offset = build2 (PLUS_EXPR, t, v_offset,
336 BINFO_VPTR_INDEX (derived));
337 v_offset = build_indirect_ref (v_offset, NULL);
340 v_offset = build_vfield_ref (build_indirect_ref (expr, NULL),
341 TREE_TYPE (TREE_TYPE (expr)));
343 v_offset = build2 (PLUS_EXPR, TREE_TYPE (v_offset),
344 v_offset, BINFO_VPTR_FIELD (v_binfo));
345 v_offset = build1 (NOP_EXPR,
346 build_pointer_type (ptrdiff_type_node),
348 v_offset = build_indirect_ref (v_offset, NULL);
349 TREE_CONSTANT (v_offset) = 1;
350 TREE_INVARIANT (v_offset) = 1;
352 offset = convert_to_integer (ptrdiff_type_node,
354 BINFO_OFFSET (v_binfo)));
356 if (!integer_zerop (offset))
357 v_offset = build2 (code, ptrdiff_type_node, v_offset, offset);
359 if (fixed_type_p < 0)
360 /* Negative fixed_type_p means this is a constructor or destructor;
361 virtual base layout is fixed in in-charge [cd]tors, but not in
363 offset = build3 (COND_EXPR, ptrdiff_type_node,
364 build2 (EQ_EXPR, boolean_type_node,
365 current_in_charge_parm, integer_zero_node),
367 BINFO_OFFSET (binfo));
372 target_type = code == PLUS_EXPR ? BINFO_TYPE (binfo) : BINFO_TYPE (d_binfo);
374 target_type = cp_build_qualified_type
375 (target_type, cp_type_quals (TREE_TYPE (TREE_TYPE (expr))));
376 ptr_target_type = build_pointer_type (target_type);
378 target_type = ptr_target_type;
380 expr = build1 (NOP_EXPR, ptr_target_type, expr);
382 if (!integer_zerop (offset))
383 expr = build2 (code, ptr_target_type, expr, offset);
388 expr = build_indirect_ref (expr, NULL);
392 expr = fold (build3 (COND_EXPR, target_type, null_test, expr,
393 fold (build1 (NOP_EXPR, target_type,
394 integer_zero_node))));
399 /* Subroutine of build_base_path; EXPR and BINFO are as in that function.
400 Perform a derived-to-base conversion by recursively building up a
401 sequence of COMPONENT_REFs to the appropriate base fields. */
404 build_simple_base_path (tree expr, tree binfo)
406 tree type = BINFO_TYPE (binfo);
407 tree d_binfo = BINFO_INHERITANCE_CHAIN (binfo);
410 if (d_binfo == NULL_TREE)
412 gcc_assert (TYPE_MAIN_VARIANT (TREE_TYPE (expr)) == type);
417 expr = build_simple_base_path (expr, d_binfo);
419 for (field = TYPE_FIELDS (BINFO_TYPE (d_binfo));
420 field; field = TREE_CHAIN (field))
421 /* Is this the base field created by build_base_field? */
422 if (TREE_CODE (field) == FIELD_DECL
423 && DECL_FIELD_IS_BASE (field)
424 && TREE_TYPE (field) == type)
425 return build_class_member_access_expr (expr, field,
428 /* Didn't find the base field?!? */
432 /* Convert OBJECT to the base TYPE. OBJECT is an expression whose
433 type is a class type or a pointer to a class type. In the former
434 case, TYPE is also a class type; in the latter it is another
435 pointer type. If CHECK_ACCESS is true, an error message is emitted
436 if TYPE is inaccessible. If OBJECT has pointer type, the value is
437 assumed to be non-NULL. */
440 convert_to_base (tree object, tree type, bool check_access, bool nonnull)
445 if (TYPE_PTR_P (TREE_TYPE (object)))
447 object_type = TREE_TYPE (TREE_TYPE (object));
448 type = TREE_TYPE (type);
451 object_type = TREE_TYPE (object);
453 binfo = lookup_base (object_type, type,
454 check_access ? ba_check : ba_unique,
456 if (!binfo || binfo == error_mark_node)
457 return error_mark_node;
459 return build_base_path (PLUS_EXPR, object, binfo, nonnull);
462 /* EXPR is an expression with unqualified class type. BASE is a base
463 binfo of that class type. Returns EXPR, converted to the BASE
464 type. This function assumes that EXPR is the most derived class;
465 therefore virtual bases can be found at their static offsets. */
468 convert_to_base_statically (tree expr, tree base)
472 expr_type = TREE_TYPE (expr);
473 if (!SAME_BINFO_TYPE_P (BINFO_TYPE (base), expr_type))
477 pointer_type = build_pointer_type (expr_type);
478 expr = build_unary_op (ADDR_EXPR, expr, /*noconvert=*/1);
479 if (!integer_zerop (BINFO_OFFSET (base)))
480 expr = build2 (PLUS_EXPR, pointer_type, expr,
481 build_nop (pointer_type, BINFO_OFFSET (base)));
482 expr = build_nop (build_pointer_type (BINFO_TYPE (base)), expr);
483 expr = build1 (INDIRECT_REF, BINFO_TYPE (base), expr);
491 build_vfield_ref (tree datum, tree type)
493 tree vfield, vcontext;
495 if (datum == error_mark_node)
496 return error_mark_node;
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)
4560 maybe_register_incomplete_var (field);
4561 /* The visibility of static data members is determined
4562 at their point of declaration, not their point of
4564 determine_visibility (field);
4569 type = TREE_TYPE (field);
4571 padding = NULL_TREE;
4573 /* If this field is a bit-field whose width is greater than its
4574 type, then there are some special rules for allocating
4576 if (DECL_C_BIT_FIELD (field)
4577 && INT_CST_LT (TYPE_SIZE (type), DECL_SIZE (field)))
4579 integer_type_kind itk;
4581 bool was_unnamed_p = false;
4582 /* We must allocate the bits as if suitably aligned for the
4583 longest integer type that fits in this many bits. type
4584 of the field. Then, we are supposed to use the left over
4585 bits as additional padding. */
4586 for (itk = itk_char; itk != itk_none; ++itk)
4587 if (INT_CST_LT (DECL_SIZE (field),
4588 TYPE_SIZE (integer_types[itk])))
4591 /* ITK now indicates a type that is too large for the
4592 field. We have to back up by one to find the largest
4594 integer_type = integer_types[itk - 1];
4596 /* Figure out how much additional padding is required. GCC
4597 3.2 always created a padding field, even if it had zero
4599 if (!abi_version_at_least (2)
4600 || INT_CST_LT (TYPE_SIZE (integer_type), DECL_SIZE (field)))
4602 if (abi_version_at_least (2) && TREE_CODE (t) == UNION_TYPE)
4603 /* In a union, the padding field must have the full width
4604 of the bit-field; all fields start at offset zero. */
4605 padding = DECL_SIZE (field);
4608 if (warn_abi && TREE_CODE (t) == UNION_TYPE)
4609 warning ("size assigned to %qT may not be "
4610 "ABI-compliant and may change in a future "
4613 padding = size_binop (MINUS_EXPR, DECL_SIZE (field),
4614 TYPE_SIZE (integer_type));
4617 #ifdef PCC_BITFIELD_TYPE_MATTERS
4618 /* An unnamed bitfield does not normally affect the
4619 alignment of the containing class on a target where
4620 PCC_BITFIELD_TYPE_MATTERS. But, the C++ ABI does not
4621 make any exceptions for unnamed bitfields when the
4622 bitfields are longer than their types. Therefore, we
4623 temporarily give the field a name. */
4624 if (PCC_BITFIELD_TYPE_MATTERS && !DECL_NAME (field))
4626 was_unnamed_p = true;
4627 DECL_NAME (field) = make_anon_name ();
4630 DECL_SIZE (field) = TYPE_SIZE (integer_type);
4631 DECL_ALIGN (field) = TYPE_ALIGN (integer_type);
4632 DECL_USER_ALIGN (field) = TYPE_USER_ALIGN (integer_type);
4633 layout_nonempty_base_or_field (rli, field, NULL_TREE,
4634 empty_base_offsets);
4636 DECL_NAME (field) = NULL_TREE;
4637 /* Now that layout has been performed, set the size of the
4638 field to the size of its declared type; the rest of the
4639 field is effectively invisible. */
4640 DECL_SIZE (field) = TYPE_SIZE (type);
4641 /* We must also reset the DECL_MODE of the field. */
4642 if (abi_version_at_least (2))
4643 DECL_MODE (field) = TYPE_MODE (type);
4645 && DECL_MODE (field) != TYPE_MODE (type))
4646 /* Versions of G++ before G++ 3.4 did not reset the
4648 warning ("the offset of %qD may not be ABI-compliant and may "
4649 "change in a future version of GCC", field);
4652 layout_nonempty_base_or_field (rli, field, NULL_TREE,
4653 empty_base_offsets);
4655 /* Remember the location of any empty classes in FIELD. */
4656 if (abi_version_at_least (2))
4657 record_subobject_offsets (TREE_TYPE (field),
4658 byte_position(field),
4662 /* If a bit-field does not immediately follow another bit-field,
4663 and yet it starts in the middle of a byte, we have failed to
4664 comply with the ABI. */
4666 && DECL_C_BIT_FIELD (field)
4667 && !last_field_was_bitfield
4668 && !integer_zerop (size_binop (TRUNC_MOD_EXPR,
4669 DECL_FIELD_BIT_OFFSET (field),
4670 bitsize_unit_node)))
4671 cp_warning_at ("offset of %qD is not ABI-compliant and may "
4672 "change in a future version of GCC",
4675 /* G++ used to use DECL_FIELD_OFFSET as if it were the byte
4676 offset of the field. */
4678 && !tree_int_cst_equal (DECL_FIELD_OFFSET (field),
4679 byte_position (field))
4680 && contains_empty_class_p (TREE_TYPE (field)))
4681 cp_warning_at ("%qD contains empty classes which may cause base "
4682 "classes to be placed at different locations in a "
4683 "future version of GCC",
4686 /* If we needed additional padding after this field, add it
4692 padding_field = build_decl (FIELD_DECL,
4695 DECL_BIT_FIELD (padding_field) = 1;
4696 DECL_SIZE (padding_field) = padding;
4697 DECL_CONTEXT (padding_field) = t;
4698 DECL_ARTIFICIAL (padding_field) = 1;
4699 layout_nonempty_base_or_field (rli, padding_field,
4701 empty_base_offsets);
4704 last_field_was_bitfield = DECL_C_BIT_FIELD (field);
4707 if (abi_version_at_least (2) && !integer_zerop (rli->bitpos))
4709 /* Make sure that we are on a byte boundary so that the size of
4710 the class without virtual bases will always be a round number
4712 rli->bitpos = round_up (rli->bitpos, BITS_PER_UNIT);
4713 normalize_rli (rli);
4716 /* G++ 3.2 does not allow virtual bases to be overlaid with tail
4718 if (!abi_version_at_least (2))
4719 include_empty_classes(rli);
4721 /* Delete all zero-width bit-fields from the list of fields. Now
4722 that the type is laid out they are no longer important. */
4723 remove_zero_width_bit_fields (t);
4725 /* Create the version of T used for virtual bases. We do not use
4726 make_aggr_type for this version; this is an artificial type. For
4727 a POD type, we just reuse T. */
4728 if (CLASSTYPE_NON_POD_P (t) || CLASSTYPE_EMPTY_P (t))
4730 base_t = make_node (TREE_CODE (t));
4732 /* Set the size and alignment for the new type. In G++ 3.2, all
4733 empty classes were considered to have size zero when used as
4735 if (!abi_version_at_least (2) && CLASSTYPE_EMPTY_P (t))
4737 TYPE_SIZE (base_t) = bitsize_zero_node;
4738 TYPE_SIZE_UNIT (base_t) = size_zero_node;
4739 if (warn_abi && !integer_zerop (rli_size_unit_so_far (rli)))
4740 warning ("layout of classes derived from empty class %qT "
4741 "may change in a future version of GCC",
4748 /* If the ABI version is not at least two, and the last
4749 field was a bit-field, RLI may not be on a byte
4750 boundary. In particular, rli_size_unit_so_far might
4751 indicate the last complete byte, while rli_size_so_far
4752 indicates the total number of bits used. Therefore,
4753 rli_size_so_far, rather than rli_size_unit_so_far, is
4754 used to compute TYPE_SIZE_UNIT. */
4755 eoc = end_of_class (t, /*include_virtuals_p=*/0);
4756 TYPE_SIZE_UNIT (base_t)
4757 = size_binop (MAX_EXPR,
4759 size_binop (CEIL_DIV_EXPR,
4760 rli_size_so_far (rli),
4761 bitsize_int (BITS_PER_UNIT))),
4764 = size_binop (MAX_EXPR,
4765 rli_size_so_far (rli),
4766 size_binop (MULT_EXPR,
4767 convert (bitsizetype, eoc),
4768 bitsize_int (BITS_PER_UNIT)));
4770 TYPE_ALIGN (base_t) = rli->record_align;
4771 TYPE_USER_ALIGN (base_t) = TYPE_USER_ALIGN (t);
4773 /* Copy the fields from T. */
4774 next_field = &TYPE_FIELDS (base_t);
4775 for (field = TYPE_FIELDS (t); field; field = TREE_CHAIN (field))
4776 if (TREE_CODE (field) == FIELD_DECL)
4778 *next_field = build_decl (FIELD_DECL,
4781 DECL_CONTEXT (*next_field) = base_t;
4782 DECL_FIELD_OFFSET (*next_field) = DECL_FIELD_OFFSET (field);
4783 DECL_FIELD_BIT_OFFSET (*next_field)
4784 = DECL_FIELD_BIT_OFFSET (field);
4785 DECL_SIZE (*next_field) = DECL_SIZE (field);
4786 DECL_MODE (*next_field) = DECL_MODE (field);
4787 next_field = &TREE_CHAIN (*next_field);
4790 /* Record the base version of the type. */
4791 CLASSTYPE_AS_BASE (t) = base_t;
4792 TYPE_CONTEXT (base_t) = t;
4795 CLASSTYPE_AS_BASE (t) = t;
4797 /* Every empty class contains an empty class. */
4798 if (CLASSTYPE_EMPTY_P (t))
4799 CLASSTYPE_CONTAINS_EMPTY_CLASS_P (t) = 1;
4801 /* Set the TYPE_DECL for this type to contain the right
4802 value for DECL_OFFSET, so that we can use it as part
4803 of a COMPONENT_REF for multiple inheritance. */
4804 layout_decl (TYPE_MAIN_DECL (t), 0);
4806 /* Now fix up any virtual base class types that we left lying
4807 around. We must get these done before we try to lay out the
4808 virtual function table. As a side-effect, this will remove the
4809 base subobject fields. */
4810 layout_virtual_bases (rli, empty_base_offsets);
4812 /* Make sure that empty classes are reflected in RLI at this
4814 include_empty_classes(rli);
4816 /* Make sure not to create any structures with zero size. */
4817 if (integer_zerop (rli_size_unit_so_far (rli)) && CLASSTYPE_EMPTY_P (t))
4819 build_decl (FIELD_DECL, NULL_TREE, char_type_node));
4821 /* Let the back-end lay out the type. */
4822 finish_record_layout (rli, /*free_p=*/true);
4824 /* Warn about bases that can't be talked about due to ambiguity. */
4825 warn_about_ambiguous_bases (t);
4827 /* Now that we're done with layout, give the base fields the real types. */
4828 for (field = TYPE_FIELDS (t); field; field = TREE_CHAIN (field))
4829 if (DECL_ARTIFICIAL (field) && IS_FAKE_BASE_TYPE (TREE_TYPE (field)))
4830 TREE_TYPE (field) = TYPE_CONTEXT (TREE_TYPE (field));
4833 splay_tree_delete (empty_base_offsets);
4836 /* Determine the "key method" for the class type indicated by TYPE,
4837 and set CLASSTYPE_KEY_METHOD accordingly. */
4840 determine_key_method (tree type)
4844 if (TYPE_FOR_JAVA (type)
4845 || processing_template_decl
4846 || CLASSTYPE_TEMPLATE_INSTANTIATION (type)
4847 || CLASSTYPE_INTERFACE_KNOWN (type))
4850 /* The key method is the first non-pure virtual function that is not
4851 inline at the point of class definition. On some targets the
4852 key function may not be inline; those targets should not call
4853 this function until the end of the translation unit. */
4854 for (method = TYPE_METHODS (type); method != NULL_TREE;
4855 method = TREE_CHAIN (method))
4856 if (DECL_VINDEX (method) != NULL_TREE
4857 && ! DECL_DECLARED_INLINE_P (method)
4858 && ! DECL_PURE_VIRTUAL_P (method))
4860 CLASSTYPE_KEY_METHOD (type) = method;
4867 /* Perform processing required when the definition of T (a class type)
4871 finish_struct_1 (tree t)
4874 /* A TREE_LIST. The TREE_VALUE of each node is a FUNCTION_DECL. */
4875 tree virtuals = NULL_TREE;
4878 if (COMPLETE_TYPE_P (t))
4880 gcc_assert (IS_AGGR_TYPE (t));
4881 error ("redefinition of %q#T", t);
4886 /* If this type was previously laid out as a forward reference,
4887 make sure we lay it out again. */
4888 TYPE_SIZE (t) = NULL_TREE;
4889 CLASSTYPE_PRIMARY_BINFO (t) = NULL_TREE;
4891 fixup_inline_methods (t);
4893 /* Make assumptions about the class; we'll reset the flags if
4895 CLASSTYPE_EMPTY_P (t) = 1;
4896 CLASSTYPE_NEARLY_EMPTY_P (t) = 1;
4897 CLASSTYPE_CONTAINS_EMPTY_CLASS_P (t) = 0;
4899 /* Do end-of-class semantic processing: checking the validity of the
4900 bases and members and add implicitly generated methods. */
4901 check_bases_and_members (t);
4903 /* Find the key method. */
4904 if (TYPE_CONTAINS_VPTR_P (t))
4906 /* The Itanium C++ ABI permits the key method to be chosen when
4907 the class is defined -- even though the key method so
4908 selected may later turn out to be an inline function. On
4909 some systems (such as ARM Symbian OS) the key method cannot
4910 be determined until the end of the translation unit. On such
4911 systems, we leave CLASSTYPE_KEY_METHOD set to NULL, which
4912 will cause the class to be added to KEYED_CLASSES. Then, in
4913 finish_file we will determine the key method. */
4914 if (targetm.cxx.key_method_may_be_inline ())
4915 determine_key_method (t);
4917 /* If a polymorphic class has no key method, we may emit the vtable
4918 in every translation unit where the class definition appears. */
4919 if (CLASSTYPE_KEY_METHOD (t) == NULL_TREE)
4920 keyed_classes = tree_cons (NULL_TREE, t, keyed_classes);
4923 /* Layout the class itself. */
4924 layout_class_type (t, &virtuals);
4925 if (CLASSTYPE_AS_BASE (t) != t)
4926 /* We use the base type for trivial assignments, and hence it
4928 compute_record_mode (CLASSTYPE_AS_BASE (t));
4930 virtuals = modify_all_vtables (t, nreverse (virtuals));
4932 /* If necessary, create the primary vtable for this class. */
4933 if (virtuals || TYPE_CONTAINS_VPTR_P (t))
4935 /* We must enter these virtuals into the table. */
4936 if (!CLASSTYPE_HAS_PRIMARY_BASE_P (t))
4937 build_primary_vtable (NULL_TREE, t);
4938 else if (! BINFO_NEW_VTABLE_MARKED (TYPE_BINFO (t)))
4939 /* Here we know enough to change the type of our virtual
4940 function table, but we will wait until later this function. */
4941 build_primary_vtable (CLASSTYPE_PRIMARY_BINFO (t), t);
4944 if (TYPE_CONTAINS_VPTR_P (t))
4949 if (BINFO_VTABLE (TYPE_BINFO (t)))
4950 gcc_assert (DECL_VIRTUAL_P (BINFO_VTABLE (TYPE_BINFO (t))));
4951 if (!CLASSTYPE_HAS_PRIMARY_BASE_P (t))
4952 gcc_assert (BINFO_VIRTUALS (TYPE_BINFO (t)) == NULL_TREE);
4954 /* Add entries for virtual functions introduced by this class. */
4955 BINFO_VIRTUALS (TYPE_BINFO (t))
4956 = chainon (BINFO_VIRTUALS (TYPE_BINFO (t)), virtuals);
4958 /* Set DECL_VINDEX for all functions declared in this class. */
4959 for (vindex = 0, fn = BINFO_VIRTUALS (TYPE_BINFO (t));
4961 fn = TREE_CHAIN (fn),
4962 vindex += (TARGET_VTABLE_USES_DESCRIPTORS
4963 ? TARGET_VTABLE_USES_DESCRIPTORS : 1))
4965 tree fndecl = BV_FN (fn);
4967 if (DECL_THUNK_P (fndecl))
4968 /* A thunk. We should never be calling this entry directly
4969 from this vtable -- we'd use the entry for the non
4970 thunk base function. */
4971 DECL_VINDEX (fndecl) = NULL_TREE;
4972 else if (TREE_CODE (DECL_VINDEX (fndecl)) != INTEGER_CST)
4973 DECL_VINDEX (fndecl) = build_int_cst (NULL_TREE, vindex);
4977 finish_struct_bits (t);
4979 /* Complete the rtl for any static member objects of the type we're
4981 for (x = TYPE_FIELDS (t); x; x = TREE_CHAIN (x))
4982 if (TREE_CODE (x) == VAR_DECL && TREE_STATIC (x)
4983 && same_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (x)), t))
4984 DECL_MODE (x) = TYPE_MODE (t);
4986 /* Done with FIELDS...now decide whether to sort these for
4987 faster lookups later.
4989 We use a small number because most searches fail (succeeding
4990 ultimately as the search bores through the inheritance
4991 hierarchy), and we want this failure to occur quickly. */
4993 n_fields = count_fields (TYPE_FIELDS (t));
4996 struct sorted_fields_type *field_vec = GGC_NEWVAR
4997 (struct sorted_fields_type,
4998 sizeof (struct sorted_fields_type) + n_fields * sizeof (tree));
4999 field_vec->len = n_fields;
5000 add_fields_to_record_type (TYPE_FIELDS (t), field_vec, 0);
5001 qsort (field_vec->elts, n_fields, sizeof (tree),
5003 if (! DECL_LANG_SPECIFIC (TYPE_MAIN_DECL (t)))
5004 retrofit_lang_decl (TYPE_MAIN_DECL (t));
5005 DECL_SORTED_FIELDS (TYPE_MAIN_DECL (t)) = field_vec;
5008 /* Make the rtl for any new vtables we have created, and unmark
5009 the base types we marked. */
5012 /* Build the VTT for T. */
5015 if (warn_nonvdtor && TYPE_POLYMORPHIC_P (t) && TYPE_HAS_DESTRUCTOR (t)
5016 && !DECL_VINDEX (CLASSTYPE_DESTRUCTORS (t)))
5019 tree dtor = CLASSTYPE_DESTRUCTORS (t);
5021 /* Warn only if the dtor is non-private or the class has friends */
5022 if (!TREE_PRIVATE (dtor) ||
5023 (CLASSTYPE_FRIEND_CLASSES (t) ||
5024 DECL_FRIENDLIST (TYPE_MAIN_DECL (t))))
5025 warning ("%q#T has virtual functions but non-virtual destructor", t);
5030 if (warn_overloaded_virtual)
5033 maybe_suppress_debug_info (t);
5035 dump_class_hierarchy (t);
5037 /* Finish debugging output for this type. */
5038 rest_of_type_compilation (t, ! LOCAL_CLASS_P (t));
5041 /* When T was built up, the member declarations were added in reverse
5042 order. Rearrange them to declaration order. */
5045 unreverse_member_declarations (tree t)
5051 /* The following lists are all in reverse order. Put them in
5052 declaration order now. */
5053 TYPE_METHODS (t) = nreverse (TYPE_METHODS (t));
5054 CLASSTYPE_DECL_LIST (t) = nreverse (CLASSTYPE_DECL_LIST (t));
5056 /* Actually, for the TYPE_FIELDS, only the non TYPE_DECLs are in
5057 reverse order, so we can't just use nreverse. */
5059 for (x = TYPE_FIELDS (t);
5060 x && TREE_CODE (x) != TYPE_DECL;
5063 next = TREE_CHAIN (x);
5064 TREE_CHAIN (x) = prev;
5069 TREE_CHAIN (TYPE_FIELDS (t)) = x;
5071 TYPE_FIELDS (t) = prev;
5076 finish_struct (tree t, tree attributes)
5078 location_t saved_loc = input_location;
5080 /* Now that we've got all the field declarations, reverse everything
5082 unreverse_member_declarations (t);
5084 cplus_decl_attributes (&t, attributes, (int) ATTR_FLAG_TYPE_IN_PLACE);
5086 /* Nadger the current location so that diagnostics point to the start of
5087 the struct, not the end. */
5088 input_location = DECL_SOURCE_LOCATION (TYPE_NAME (t));
5090 if (processing_template_decl)
5094 finish_struct_methods (t);
5095 TYPE_SIZE (t) = bitsize_zero_node;
5097 /* We need to emit an error message if this type was used as a parameter
5098 and it is an abstract type, even if it is a template. We construct
5099 a simple CLASSTYPE_PURE_VIRTUALS list without taking bases into
5100 account and we call complete_vars with this type, which will check
5101 the PARM_DECLS. Note that while the type is being defined,
5102 CLASSTYPE_PURE_VIRTUALS contains the list of the inline friends
5103 (see CLASSTYPE_INLINE_FRIENDS) so we need to clear it. */
5104 CLASSTYPE_PURE_VIRTUALS (t) = NULL;
5105 for (x = TYPE_METHODS (t); x; x = TREE_CHAIN (x))
5106 if (DECL_PURE_VIRTUAL_P (x))
5107 VEC_safe_push (tree, CLASSTYPE_PURE_VIRTUALS (t), x);
5111 finish_struct_1 (t);
5113 input_location = saved_loc;
5115 TYPE_BEING_DEFINED (t) = 0;
5117 if (current_class_type)
5120 error ("trying to finish struct, but kicked out due to previous parse errors");
5122 if (processing_template_decl && at_function_scope_p ())
5123 add_stmt (build_min (TAG_DEFN, t));
5128 /* Return the dynamic type of INSTANCE, if known.
5129 Used to determine whether the virtual function table is needed
5132 *NONNULL is set iff INSTANCE can be known to be nonnull, regardless
5133 of our knowledge of its type. *NONNULL should be initialized
5134 before this function is called. */
5137 fixed_type_or_null (tree instance, int* nonnull, int* cdtorp)
5139 switch (TREE_CODE (instance))
5142 if (POINTER_TYPE_P (TREE_TYPE (instance)))
5145 return fixed_type_or_null (TREE_OPERAND (instance, 0),
5149 /* This is a call to a constructor, hence it's never zero. */
5150 if (TREE_HAS_CONSTRUCTOR (instance))
5154 return TREE_TYPE (instance);
5159 /* This is a call to a constructor, hence it's never zero. */
5160 if (TREE_HAS_CONSTRUCTOR (instance))
5164 return TREE_TYPE (instance);
5166 return fixed_type_or_null (TREE_OPERAND (instance, 0), nonnull, cdtorp);
5170 if (TREE_CODE (TREE_OPERAND (instance, 0)) == ADDR_EXPR)
5171 return fixed_type_or_null (TREE_OPERAND (instance, 0), nonnull, cdtorp);
5172 if (TREE_CODE (TREE_OPERAND (instance, 1)) == INTEGER_CST)
5173 /* Propagate nonnull. */
5174 return fixed_type_or_null (TREE_OPERAND (instance, 0), nonnull, cdtorp);
5179 return fixed_type_or_null (TREE_OPERAND (instance, 0), nonnull, cdtorp);
5182 instance = TREE_OPERAND (instance, 0);
5185 /* Just because we see an ADDR_EXPR doesn't mean we're dealing
5186 with a real object -- given &p->f, p can still be null. */
5187 tree t = get_base_address (instance);
5188 /* ??? Probably should check DECL_WEAK here. */
5189 if (t && DECL_P (t))
5192 return fixed_type_or_null (instance, nonnull, cdtorp);
5195 /* If this component is really a base class reference, then the field
5196 itself isn't definitive. */
5197 if (DECL_FIELD_IS_BASE (TREE_OPERAND (instance, 1)))
5198 return fixed_type_or_null (TREE_OPERAND (instance, 0), nonnull, cdtorp);
5199 return fixed_type_or_null (TREE_OPERAND (instance, 1), nonnull, cdtorp);
5203 if (TREE_CODE (TREE_TYPE (instance)) == ARRAY_TYPE
5204 && IS_AGGR_TYPE (TREE_TYPE (TREE_TYPE (instance))))
5208 return TREE_TYPE (TREE_TYPE (instance));
5210 /* fall through... */
5214 if (IS_AGGR_TYPE (TREE_TYPE (instance)))
5218 return TREE_TYPE (instance);
5220 else if (instance == current_class_ptr)
5225 /* if we're in a ctor or dtor, we know our type. */
5226 if (DECL_LANG_SPECIFIC (current_function_decl)
5227 && (DECL_CONSTRUCTOR_P (current_function_decl)
5228 || DECL_DESTRUCTOR_P (current_function_decl)))
5232 return TREE_TYPE (TREE_TYPE (instance));
5235 else if (TREE_CODE (TREE_TYPE (instance)) == REFERENCE_TYPE)
5237 /* Reference variables should be references to objects. */
5241 /* DECL_VAR_MARKED_P is used to prevent recursion; a
5242 variable's initializer may refer to the variable
5244 if (TREE_CODE (instance) == VAR_DECL
5245 && DECL_INITIAL (instance)
5246 && !DECL_VAR_MARKED_P (instance))
5249 DECL_VAR_MARKED_P (instance) = 1;
5250 type = fixed_type_or_null (DECL_INITIAL (instance),
5252 DECL_VAR_MARKED_P (instance) = 0;
5263 /* Return nonzero if the dynamic type of INSTANCE is known, and
5264 equivalent to the static type. We also handle the case where
5265 INSTANCE is really a pointer. Return negative if this is a
5266 ctor/dtor. There the dynamic type is known, but this might not be
5267 the most derived base of the original object, and hence virtual
5268 bases may not be layed out according to this type.
5270 Used to determine whether the virtual function table is needed
5273 *NONNULL is set iff INSTANCE can be known to be nonnull, regardless
5274 of our knowledge of its type. *NONNULL should be initialized
5275 before this function is called. */
5278 resolves_to_fixed_type_p (tree instance, int* nonnull)
5280 tree t = TREE_TYPE (instance);
5283 tree fixed = fixed_type_or_null (instance, nonnull, &cdtorp);
5284 if (fixed == NULL_TREE)
5286 if (POINTER_TYPE_P (t))
5288 if (!same_type_ignoring_top_level_qualifiers_p (t, fixed))
5290 return cdtorp ? -1 : 1;
5295 init_class_processing (void)
5297 current_class_depth = 0;
5298 current_class_stack_size = 10;
5300 = xmalloc (current_class_stack_size * sizeof (struct class_stack_node));
5301 VARRAY_TREE_INIT (local_classes, 8, "local_classes");
5303 ridpointers[(int) RID_PUBLIC] = access_public_node;
5304 ridpointers[(int) RID_PRIVATE] = access_private_node;
5305 ridpointers[(int) RID_PROTECTED] = access_protected_node;
5308 /* Restore the cached PREVIOUS_CLASS_LEVEL. */
5311 restore_class_cache (void)
5315 /* We are re-entering the same class we just left, so we don't
5316 have to search the whole inheritance matrix to find all the
5317 decls to bind again. Instead, we install the cached
5318 class_shadowed list and walk through it binding names. */
5319 push_binding_level (previous_class_level);
5320 class_binding_level = previous_class_level;
5321 /* Restore IDENTIFIER_TYPE_VALUE. */
5322 for (type = class_binding_level->type_shadowed;
5324 type = TREE_CHAIN (type))
5325 SET_IDENTIFIER_TYPE_VALUE (TREE_PURPOSE (type), TREE_TYPE (type));
5328 /* Set global variables CURRENT_CLASS_NAME and CURRENT_CLASS_TYPE as
5329 appropriate for TYPE.
5331 So that we may avoid calls to lookup_name, we cache the _TYPE
5332 nodes of local TYPE_DECLs in the TREE_TYPE field of the name.
5334 For multiple inheritance, we perform a two-pass depth-first search
5335 of the type lattice. */
5338 pushclass (tree type)
5340 type = TYPE_MAIN_VARIANT (type);
5342 /* Make sure there is enough room for the new entry on the stack. */
5343 if (current_class_depth + 1 >= current_class_stack_size)
5345 current_class_stack_size *= 2;
5347 = xrealloc (current_class_stack,
5348 current_class_stack_size
5349 * sizeof (struct class_stack_node));
5352 /* Insert a new entry on the class stack. */
5353 current_class_stack[current_class_depth].name = current_class_name;
5354 current_class_stack[current_class_depth].type = current_class_type;
5355 current_class_stack[current_class_depth].access = current_access_specifier;
5356 current_class_stack[current_class_depth].names_used = 0;
5357 current_class_depth++;
5359 /* Now set up the new type. */
5360 current_class_name = TYPE_NAME (type);
5361 if (TREE_CODE (current_class_name) == TYPE_DECL)
5362 current_class_name = DECL_NAME (current_class_name);
5363 current_class_type = type;
5365 /* By default, things in classes are private, while things in
5366 structures or unions are public. */
5367 current_access_specifier = (CLASSTYPE_DECLARED_CLASS (type)
5368 ? access_private_node
5369 : access_public_node);
5371 if (previous_class_level
5372 && type != previous_class_level->this_entity
5373 && current_class_depth == 1)
5375 /* Forcibly remove any old class remnants. */
5376 invalidate_class_lookup_cache ();
5379 if (!previous_class_level
5380 || type != previous_class_level->this_entity
5381 || current_class_depth > 1)
5384 restore_class_cache ();
5387 /* When we exit a toplevel class scope, we save its binding level so
5388 that we can restore it quickly. Here, we've entered some other
5389 class, so we must invalidate our cache. */
5392 invalidate_class_lookup_cache (void)
5394 previous_class_level = NULL;
5397 /* Get out of the current class scope. If we were in a class scope
5398 previously, that is the one popped to. */
5405 current_class_depth--;
5406 current_class_name = current_class_stack[current_class_depth].name;
5407 current_class_type = current_class_stack[current_class_depth].type;
5408 current_access_specifier = current_class_stack[current_class_depth].access;
5409 if (current_class_stack[current_class_depth].names_used)
5410 splay_tree_delete (current_class_stack[current_class_depth].names_used);
5413 /* Returns 1 if current_class_type is either T or a nested type of T.
5414 We start looking from 1 because entry 0 is from global scope, and has
5418 currently_open_class (tree t)
5421 if (current_class_type && same_type_p (t, current_class_type))
5423 for (i = 1; i < current_class_depth; ++i)
5424 if (current_class_stack[i].type
5425 && same_type_p (current_class_stack [i].type, t))
5430 /* If either current_class_type or one of its enclosing classes are derived
5431 from T, return the appropriate type. Used to determine how we found
5432 something via unqualified lookup. */
5435 currently_open_derived_class (tree t)
5439 /* The bases of a dependent type are unknown. */
5440 if (dependent_type_p (t))
5443 if (!current_class_type)
5446 if (DERIVED_FROM_P (t, current_class_type))
5447 return current_class_type;
5449 for (i = current_class_depth - 1; i > 0; --i)
5450 if (DERIVED_FROM_P (t, current_class_stack[i].type))
5451 return current_class_stack[i].type;
5456 /* When entering a class scope, all enclosing class scopes' names with
5457 static meaning (static variables, static functions, types and
5458 enumerators) have to be visible. This recursive function calls
5459 pushclass for all enclosing class contexts until global or a local
5460 scope is reached. TYPE is the enclosed class. */
5463 push_nested_class (tree type)
5467 /* A namespace might be passed in error cases, like A::B:C. */
5468 if (type == NULL_TREE
5469 || type == error_mark_node
5470 || TREE_CODE (type) == NAMESPACE_DECL
5471 || ! IS_AGGR_TYPE (type)
5472 || TREE_CODE (type) == TEMPLATE_TYPE_PARM
5473 || TREE_CODE (type) == BOUND_TEMPLATE_TEMPLATE_PARM)
5476 context = DECL_CONTEXT (TYPE_MAIN_DECL (type));
5478 if (context && CLASS_TYPE_P (context))
5479 push_nested_class (context);
5483 /* Undoes a push_nested_class call. */
5486 pop_nested_class (void)
5488 tree context = DECL_CONTEXT (TYPE_MAIN_DECL (current_class_type));
5491 if (context && CLASS_TYPE_P (context))
5492 pop_nested_class ();
5495 /* Returns the number of extern "LANG" blocks we are nested within. */
5498 current_lang_depth (void)
5500 return VARRAY_ACTIVE_SIZE (current_lang_base);
5503 /* Set global variables CURRENT_LANG_NAME to appropriate value
5504 so that behavior of name-mangling machinery is correct. */
5507 push_lang_context (tree name)
5509 VARRAY_PUSH_TREE (current_lang_base, current_lang_name);
5511 if (name == lang_name_cplusplus)
5513 current_lang_name = name;
5515 else if (name == lang_name_java)
5517 current_lang_name = name;
5518 /* DECL_IGNORED_P is initially set for these types, to avoid clutter.
5519 (See record_builtin_java_type in decl.c.) However, that causes
5520 incorrect debug entries if these types are actually used.
5521 So we re-enable debug output after extern "Java". */
5522 DECL_IGNORED_P (TYPE_NAME (java_byte_type_node)) = 0;
5523 DECL_IGNORED_P (TYPE_NAME (java_short_type_node)) = 0;
5524 DECL_IGNORED_P (TYPE_NAME (java_int_type_node)) = 0;
5525 DECL_IGNORED_P (TYPE_NAME (java_long_type_node)) = 0;
5526 DECL_IGNORED_P (TYPE_NAME (java_float_type_node)) = 0;
5527 DECL_IGNORED_P (TYPE_NAME (java_double_type_node)) = 0;
5528 DECL_IGNORED_P (TYPE_NAME (java_char_type_node)) = 0;
5529 DECL_IGNORED_P (TYPE_NAME (java_boolean_type_node)) = 0;
5531 else if (name == lang_name_c)
5533 current_lang_name = name;
5536 error ("language string %<\"%E\"%> not recognized", name);
5539 /* Get out of the current language scope. */
5542 pop_lang_context (void)
5544 current_lang_name = VARRAY_TOP_TREE (current_lang_base);
5545 VARRAY_POP (current_lang_base);
5548 /* Type instantiation routines. */
5550 /* Given an OVERLOAD and a TARGET_TYPE, return the function that
5551 matches the TARGET_TYPE. If there is no satisfactory match, return
5552 error_mark_node, and issue a error & warning messages under control
5553 of FLAGS. Permit pointers to member function if FLAGS permits. If
5554 TEMPLATE_ONLY, the name of the overloaded function was a
5555 template-id, and EXPLICIT_TARGS are the explicitly provided
5556 template arguments. */
5559 resolve_address_of_overloaded_function (tree target_type,
5561 tsubst_flags_t flags,
5563 tree explicit_targs)
5565 /* Here's what the standard says:
5569 If the name is a function template, template argument deduction
5570 is done, and if the argument deduction succeeds, the deduced
5571 arguments are used to generate a single template function, which
5572 is added to the set of overloaded functions considered.
5574 Non-member functions and static member functions match targets of
5575 type "pointer-to-function" or "reference-to-function." Nonstatic
5576 member functions match targets of type "pointer-to-member
5577 function;" the function type of the pointer to member is used to
5578 select the member function from the set of overloaded member
5579 functions. If a nonstatic member function is selected, the
5580 reference to the overloaded function name is required to have the
5581 form of a pointer to member as described in 5.3.1.
5583 If more than one function is selected, any template functions in
5584 the set are eliminated if the set also contains a non-template
5585 function, and any given template function is eliminated if the
5586 set contains a second template function that is more specialized
5587 than the first according to the partial ordering rules 14.5.5.2.
5588 After such eliminations, if any, there shall remain exactly one
5589 selected function. */
5592 int is_reference = 0;
5593 /* We store the matches in a TREE_LIST rooted here. The functions
5594 are the TREE_PURPOSE, not the TREE_VALUE, in this list, for easy
5595 interoperability with most_specialized_instantiation. */
5596 tree matches = NULL_TREE;
5599 /* By the time we get here, we should be seeing only real
5600 pointer-to-member types, not the internal POINTER_TYPE to
5601 METHOD_TYPE representation. */
5602 gcc_assert (TREE_CODE (target_type) != POINTER_TYPE
5603 || TREE_CODE (TREE_TYPE (target_type)) != METHOD_TYPE);
5605 gcc_assert (is_overloaded_fn (overload));
5607 /* Check that the TARGET_TYPE is reasonable. */
5608 if (TYPE_PTRFN_P (target_type))
5610 else if (TYPE_PTRMEMFUNC_P (target_type))
5611 /* This is OK, too. */
5613 else if (TREE_CODE (target_type) == FUNCTION_TYPE)
5615 /* This is OK, too. This comes from a conversion to reference
5617 target_type = build_reference_type (target_type);
5622 if (flags & tf_error)
5623 error ("cannot resolve overloaded function %qD based on"
5624 " conversion to type %qT",
5625 DECL_NAME (OVL_FUNCTION (overload)), target_type);
5626 return error_mark_node;
5629 /* If we can find a non-template function that matches, we can just
5630 use it. There's no point in generating template instantiations
5631 if we're just going to throw them out anyhow. But, of course, we
5632 can only do this when we don't *need* a template function. */
5637 for (fns = overload; fns; fns = OVL_NEXT (fns))
5639 tree fn = OVL_CURRENT (fns);
5642 if (TREE_CODE (fn) == TEMPLATE_DECL)
5643 /* We're not looking for templates just yet. */
5646 if ((TREE_CODE (TREE_TYPE (fn)) == METHOD_TYPE)
5648 /* We're looking for a non-static member, and this isn't
5649 one, or vice versa. */
5652 /* Ignore anticipated decls of undeclared builtins. */
5653 if (DECL_ANTICIPATED (fn))
5656 /* See if there's a match. */
5657 fntype = TREE_TYPE (fn);
5659 fntype = build_ptrmemfunc_type (build_pointer_type (fntype));
5660 else if (!is_reference)
5661 fntype = build_pointer_type (fntype);
5663 if (can_convert_arg (target_type, fntype, fn))
5664 matches = tree_cons (fn, NULL_TREE, matches);
5668 /* Now, if we've already got a match (or matches), there's no need
5669 to proceed to the template functions. But, if we don't have a
5670 match we need to look at them, too. */
5673 tree target_fn_type;
5674 tree target_arg_types;
5675 tree target_ret_type;
5680 = TREE_TYPE (TYPE_PTRMEMFUNC_FN_TYPE (target_type));
5682 target_fn_type = TREE_TYPE (target_type);
5683 target_arg_types = TYPE_ARG_TYPES (target_fn_type);
5684 target_ret_type = TREE_TYPE (target_fn_type);
5686 /* Never do unification on the 'this' parameter. */
5687 if (TREE_CODE (target_fn_type) == METHOD_TYPE)
5688 target_arg_types = TREE_CHAIN (target_arg_types);
5690 for (fns = overload; fns; fns = OVL_NEXT (fns))
5692 tree fn = OVL_CURRENT (fns);
5694 tree instantiation_type;
5697 if (TREE_CODE (fn) != TEMPLATE_DECL)
5698 /* We're only looking for templates. */
5701 if ((TREE_CODE (TREE_TYPE (fn)) == METHOD_TYPE)
5703 /* We're not looking for a non-static member, and this is
5704 one, or vice versa. */
5707 /* Try to do argument deduction. */
5708 targs = make_tree_vec (DECL_NTPARMS (fn));
5709 if (fn_type_unification (fn, explicit_targs, targs,
5710 target_arg_types, target_ret_type,
5711 DEDUCE_EXACT, -1) != 0)
5712 /* Argument deduction failed. */
5715 /* Instantiate the template. */
5716 instantiation = instantiate_template (fn, targs, flags);
5717 if (instantiation == error_mark_node)
5718 /* Instantiation failed. */
5721 /* See if there's a match. */
5722 instantiation_type = TREE_TYPE (instantiation);
5724 instantiation_type =
5725 build_ptrmemfunc_type (build_pointer_type (instantiation_type));
5726 else if (!is_reference)
5727 instantiation_type = build_pointer_type (instantiation_type);
5728 if (can_convert_arg (target_type, instantiation_type, instantiation))
5729 matches = tree_cons (instantiation, fn, matches);
5732 /* Now, remove all but the most specialized of the matches. */
5735 tree match = most_specialized_instantiation (matches);
5737 if (match != error_mark_node)
5738 matches = tree_cons (match, NULL_TREE, NULL_TREE);
5742 /* Now we should have exactly one function in MATCHES. */
5743 if (matches == NULL_TREE)
5745 /* There were *no* matches. */
5746 if (flags & tf_error)
5748 error ("no matches converting function %qD to type %q#T",
5749 DECL_NAME (OVL_FUNCTION (overload)),
5752 /* print_candidates expects a chain with the functions in
5753 TREE_VALUE slots, so we cons one up here (we're losing anyway,
5754 so why be clever?). */
5755 for (; overload; overload = OVL_NEXT (overload))
5756 matches = tree_cons (NULL_TREE, OVL_CURRENT (overload),
5759 print_candidates (matches);
5761 return error_mark_node;
5763 else if (TREE_CHAIN (matches))
5765 /* There were too many matches. */
5767 if (flags & tf_error)
5771 error ("converting overloaded function %qD to type %q#T is ambiguous",
5772 DECL_NAME (OVL_FUNCTION (overload)),
5775 /* Since print_candidates expects the functions in the
5776 TREE_VALUE slot, we flip them here. */
5777 for (match = matches; match; match = TREE_CHAIN (match))
5778 TREE_VALUE (match) = TREE_PURPOSE (match);
5780 print_candidates (matches);
5783 return error_mark_node;
5786 /* Good, exactly one match. Now, convert it to the correct type. */
5787 fn = TREE_PURPOSE (matches);
5789 if (DECL_NONSTATIC_MEMBER_FUNCTION_P (fn)
5790 && !(flags & tf_ptrmem_ok) && !flag_ms_extensions)
5792 static int explained;
5794 if (!(flags & tf_error))
5795 return error_mark_node;
5797 pedwarn ("assuming pointer to member %qD", fn);
5800 pedwarn ("(a pointer to member can only be formed with %<&%E%>)", fn);
5805 /* If we're doing overload resolution purely for the purpose of
5806 determining conversion sequences, we should not consider the
5807 function used. If this conversion sequence is selected, the
5808 function will be marked as used at this point. */
5809 if (!(flags & tf_conv))
5812 if (TYPE_PTRFN_P (target_type) || TYPE_PTRMEMFUNC_P (target_type))
5813 return build_unary_op (ADDR_EXPR, fn, 0);
5816 /* The target must be a REFERENCE_TYPE. Above, build_unary_op
5817 will mark the function as addressed, but here we must do it
5819 cxx_mark_addressable (fn);
5825 /* This function will instantiate the type of the expression given in
5826 RHS to match the type of LHSTYPE. If errors exist, then return
5827 error_mark_node. FLAGS is a bit mask. If TF_ERROR is set, then
5828 we complain on errors. If we are not complaining, never modify rhs,
5829 as overload resolution wants to try many possible instantiations, in
5830 the hope that at least one will work.
5832 For non-recursive calls, LHSTYPE should be a function, pointer to
5833 function, or a pointer to member function. */
5836 instantiate_type (tree lhstype, tree rhs, tsubst_flags_t flags)
5838 tsubst_flags_t flags_in = flags;
5840 flags &= ~tf_ptrmem_ok;
5842 if (TREE_CODE (lhstype) == UNKNOWN_TYPE)
5844 if (flags & tf_error)
5845 error ("not enough type information");
5846 return error_mark_node;
5849 if (TREE_TYPE (rhs) != NULL_TREE && ! (type_unknown_p (rhs)))
5851 if (same_type_p (lhstype, TREE_TYPE (rhs)))
5853 if (flag_ms_extensions
5854 && TYPE_PTRMEMFUNC_P (lhstype)
5855 && !TYPE_PTRMEMFUNC_P (TREE_TYPE (rhs)))
5856 /* Microsoft allows `A::f' to be resolved to a
5857 pointer-to-member. */
5861 if (flags & tf_error)
5862 error ("argument of type %qT does not match %qT",
5863 TREE_TYPE (rhs), lhstype);
5864 return error_mark_node;
5868 if (TREE_CODE (rhs) == BASELINK)
5869 rhs = BASELINK_FUNCTIONS (rhs);
5871 /* If we are in a template, and have a NON_DEPENDENT_EXPR, we cannot
5872 deduce any type information. */
5873 if (TREE_CODE (rhs) == NON_DEPENDENT_EXPR)
5875 if (flags & tf_error)
5876 error ("not enough type information");
5877 return error_mark_node;
5880 /* We don't overwrite rhs if it is an overloaded function.
5881 Copying it would destroy the tree link. */
5882 if (TREE_CODE (rhs) != OVERLOAD)
5883 rhs = copy_node (rhs);
5885 /* This should really only be used when attempting to distinguish
5886 what sort of a pointer to function we have. For now, any
5887 arithmetic operation which is not supported on pointers
5888 is rejected as an error. */
5890 switch (TREE_CODE (rhs))
5903 new_rhs = instantiate_type (build_pointer_type (lhstype),
5904 TREE_OPERAND (rhs, 0), flags);
5905 if (new_rhs == error_mark_node)
5906 return error_mark_node;
5908 TREE_TYPE (rhs) = lhstype;
5909 TREE_OPERAND (rhs, 0) = new_rhs;
5914 rhs = copy_node (TREE_OPERAND (rhs, 0));
5915 TREE_TYPE (rhs) = unknown_type_node;
5916 return instantiate_type (lhstype, rhs, flags);
5920 tree member = TREE_OPERAND (rhs, 1);
5922 member = instantiate_type (lhstype, member, flags);
5923 if (member != error_mark_node
5924 && TREE_SIDE_EFFECTS (TREE_OPERAND (rhs, 0)))
5925 /* Do not lose object's side effects. */
5926 return build2 (COMPOUND_EXPR, TREE_TYPE (member),
5927 TREE_OPERAND (rhs, 0), member);
5932 rhs = TREE_OPERAND (rhs, 1);
5933 if (BASELINK_P (rhs))
5934 return instantiate_type (lhstype, BASELINK_FUNCTIONS (rhs), flags_in);
5936 /* This can happen if we are forming a pointer-to-member for a
5938 gcc_assert (TREE_CODE (rhs) == TEMPLATE_ID_EXPR);
5942 case TEMPLATE_ID_EXPR:
5944 tree fns = TREE_OPERAND (rhs, 0);
5945 tree args = TREE_OPERAND (rhs, 1);
5948 resolve_address_of_overloaded_function (lhstype, fns, flags_in,
5949 /*template_only=*/true,
5956 resolve_address_of_overloaded_function (lhstype, rhs, flags_in,
5957 /*template_only=*/false,
5958 /*explicit_targs=*/NULL_TREE);
5961 /* This is too hard for now. */
5967 TREE_OPERAND (rhs, 0)
5968 = instantiate_type (lhstype, TREE_OPERAND (rhs, 0), flags);
5969 if (TREE_OPERAND (rhs, 0) == error_mark_node)
5970 return error_mark_node;
5971 TREE_OPERAND (rhs, 1)
5972 = instantiate_type (lhstype, TREE_OPERAND (rhs, 1), flags);
5973 if (TREE_OPERAND (rhs, 1) == error_mark_node)
5974 return error_mark_node;
5976 TREE_TYPE (rhs) = lhstype;
5980 case TRUNC_DIV_EXPR:
5981 case FLOOR_DIV_EXPR:
5983 case ROUND_DIV_EXPR:
5985 case TRUNC_MOD_EXPR:
5986 case FLOOR_MOD_EXPR:
5988 case ROUND_MOD_EXPR:
5989 case FIX_ROUND_EXPR:
5990 case FIX_FLOOR_EXPR:
5992 case FIX_TRUNC_EXPR:
6007 case PREINCREMENT_EXPR:
6008 case PREDECREMENT_EXPR:
6009 case POSTINCREMENT_EXPR:
6010 case POSTDECREMENT_EXPR:
6011 if (flags & tf_error)
6012 error ("invalid operation on uninstantiated type");
6013 return error_mark_node;
6015 case TRUTH_AND_EXPR:
6017 case TRUTH_XOR_EXPR:
6024 case TRUTH_ANDIF_EXPR:
6025 case TRUTH_ORIF_EXPR:
6026 case TRUTH_NOT_EXPR:
6027 if (flags & tf_error)
6028 error ("not enough type information");
6029 return error_mark_node;
6032 if (type_unknown_p (TREE_OPERAND (rhs, 0)))
6034 if (flags & tf_error)
6035 error ("not enough type information");
6036 return error_mark_node;
6038 TREE_OPERAND (rhs, 1)
6039 = instantiate_type (lhstype, TREE_OPERAND (rhs, 1), flags);
6040 if (TREE_OPERAND (rhs, 1) == error_mark_node)
6041 return error_mark_node;
6042 TREE_OPERAND (rhs, 2)
6043 = instantiate_type (lhstype, TREE_OPERAND (rhs, 2), flags);
6044 if (TREE_OPERAND (rhs, 2) == error_mark_node)
6045 return error_mark_node;
6047 TREE_TYPE (rhs) = lhstype;
6051 TREE_OPERAND (rhs, 1)
6052 = instantiate_type (lhstype, TREE_OPERAND (rhs, 1), flags);
6053 if (TREE_OPERAND (rhs, 1) == error_mark_node)
6054 return error_mark_node;
6056 TREE_TYPE (rhs) = lhstype;
6061 if (PTRMEM_OK_P (rhs))
6062 flags |= tf_ptrmem_ok;
6064 return instantiate_type (lhstype, TREE_OPERAND (rhs, 0), flags);
6068 return error_mark_node;
6073 return error_mark_node;
6076 /* Return the name of the virtual function pointer field
6077 (as an IDENTIFIER_NODE) for the given TYPE. Note that
6078 this may have to look back through base types to find the
6079 ultimate field name. (For single inheritance, these could
6080 all be the same name. Who knows for multiple inheritance). */
6083 get_vfield_name (tree type)
6085 tree binfo, base_binfo;
6088 for (binfo = TYPE_BINFO (type);
6089 BINFO_N_BASE_BINFOS (binfo);
6092 base_binfo = BINFO_BASE_BINFO (binfo, 0);
6094 if (BINFO_VIRTUAL_P (base_binfo)
6095 || !TYPE_CONTAINS_VPTR_P (BINFO_TYPE (base_binfo)))
6099 type = BINFO_TYPE (binfo);
6100 buf = alloca (sizeof (VFIELD_NAME_FORMAT) + TYPE_NAME_LENGTH (type) + 2);
6101 sprintf (buf, VFIELD_NAME_FORMAT,
6102 IDENTIFIER_POINTER (constructor_name (type)));
6103 return get_identifier (buf);
6107 print_class_statistics (void)
6109 #ifdef GATHER_STATISTICS
6110 fprintf (stderr, "convert_harshness = %d\n", n_convert_harshness);
6111 fprintf (stderr, "compute_conversion_costs = %d\n", n_compute_conversion_costs);
6114 fprintf (stderr, "vtables = %d; vtable searches = %d\n",
6115 n_vtables, n_vtable_searches);
6116 fprintf (stderr, "vtable entries = %d; vtable elems = %d\n",
6117 n_vtable_entries, n_vtable_elems);
6122 /* Build a dummy reference to ourselves so Derived::Base (and A::A) works,
6123 according to [class]:
6124 The class-name is also inserted
6125 into the scope of the class itself. For purposes of access checking,
6126 the inserted class name is treated as if it were a public member name. */
6129 build_self_reference (void)
6131 tree name = constructor_name (current_class_type);
6132 tree value = build_lang_decl (TYPE_DECL, name, current_class_type);
6135 DECL_NONLOCAL (value) = 1;
6136 DECL_CONTEXT (value) = current_class_type;
6137 DECL_ARTIFICIAL (value) = 1;
6138 SET_DECL_SELF_REFERENCE_P (value);
6140 if (processing_template_decl)
6141 value = push_template_decl (value);
6143 saved_cas = current_access_specifier;
6144 current_access_specifier = access_public_node;
6145 finish_member_declaration (value);
6146 current_access_specifier = saved_cas;
6149 /* Returns 1 if TYPE contains only padding bytes. */
6152 is_empty_class (tree type)
6154 if (type == error_mark_node)
6157 if (! IS_AGGR_TYPE (type))
6160 /* In G++ 3.2, whether or not a class was empty was determined by
6161 looking at its size. */
6162 if (abi_version_at_least (2))
6163 return CLASSTYPE_EMPTY_P (type);
6165 return integer_zerop (CLASSTYPE_SIZE (type));
6168 /* Returns true if TYPE contains an empty class. */
6171 contains_empty_class_p (tree type)
6173 if (is_empty_class (type))
6175 if (CLASS_TYPE_P (type))
6182 for (binfo = TYPE_BINFO (type), i = 0;
6183 BINFO_BASE_ITERATE (binfo, i, base_binfo); ++i)
6184 if (contains_empty_class_p (BINFO_TYPE (base_binfo)))
6186 for (field = TYPE_FIELDS (type); field; field = TREE_CHAIN (field))
6187 if (TREE_CODE (field) == FIELD_DECL
6188 && !DECL_ARTIFICIAL (field)
6189 && is_empty_class (TREE_TYPE (field)))
6192 else if (TREE_CODE (type) == ARRAY_TYPE)
6193 return contains_empty_class_p (TREE_TYPE (type));
6197 /* Find the enclosing class of the given NODE. NODE can be a *_DECL or
6198 a *_TYPE node. NODE can also be a local class. */
6201 get_enclosing_class (tree type)
6205 while (node && TREE_CODE (node) != NAMESPACE_DECL)
6207 switch (TREE_CODE_CLASS (TREE_CODE (node)))
6209 case tcc_declaration:
6210 node = DECL_CONTEXT (node);
6216 node = TYPE_CONTEXT (node);
6226 /* Note that NAME was looked up while the current class was being
6227 defined and that the result of that lookup was DECL. */
6230 maybe_note_name_used_in_class (tree name, tree decl)
6232 splay_tree names_used;
6234 /* If we're not defining a class, there's nothing to do. */
6235 if (!(innermost_scope_kind() == sk_class
6236 && TYPE_BEING_DEFINED (current_class_type)))
6239 /* If there's already a binding for this NAME, then we don't have
6240 anything to worry about. */
6241 if (lookup_member (current_class_type, name,
6242 /*protect=*/0, /*want_type=*/false))
6245 if (!current_class_stack[current_class_depth - 1].names_used)
6246 current_class_stack[current_class_depth - 1].names_used
6247 = splay_tree_new (splay_tree_compare_pointers, 0, 0);
6248 names_used = current_class_stack[current_class_depth - 1].names_used;
6250 splay_tree_insert (names_used,
6251 (splay_tree_key) name,
6252 (splay_tree_value) decl);
6255 /* Note that NAME was declared (as DECL) in the current class. Check
6256 to see that the declaration is valid. */
6259 note_name_declared_in_class (tree name, tree decl)
6261 splay_tree names_used;
6264 /* Look to see if we ever used this name. */
6266 = current_class_stack[current_class_depth - 1].names_used;
6270 n = splay_tree_lookup (names_used, (splay_tree_key) name);
6273 /* [basic.scope.class]
6275 A name N used in a class S shall refer to the same declaration
6276 in its context and when re-evaluated in the completed scope of
6278 error ("declaration of %q#D", decl);
6279 cp_error_at ("changes meaning of %qD from %q+#D",
6280 DECL_NAME (OVL_CURRENT (decl)),
6285 /* Returns the VAR_DECL for the complete vtable associated with BINFO.
6286 Secondary vtables are merged with primary vtables; this function
6287 will return the VAR_DECL for the primary vtable. */
6290 get_vtbl_decl_for_binfo (tree binfo)
6294 decl = BINFO_VTABLE (binfo);
6295 if (decl && TREE_CODE (decl) == PLUS_EXPR)
6297 gcc_assert (TREE_CODE (TREE_OPERAND (decl, 0)) == ADDR_EXPR);
6298 decl = TREE_OPERAND (TREE_OPERAND (decl, 0), 0);
6301 gcc_assert (TREE_CODE (decl) == VAR_DECL);
6306 /* Returns the binfo for the primary base of BINFO. If the resulting
6307 BINFO is a virtual base, and it is inherited elsewhere in the
6308 hierarchy, then the returned binfo might not be the primary base of
6309 BINFO in the complete object. Check BINFO_PRIMARY_P or
6310 BINFO_LOST_PRIMARY_P to be sure. */
6313 get_primary_binfo (tree binfo)
6318 primary_base = CLASSTYPE_PRIMARY_BINFO (BINFO_TYPE (binfo));
6322 result = copied_binfo (primary_base, binfo);
6326 /* If INDENTED_P is zero, indent to INDENT. Return nonzero. */
6329 maybe_indent_hierarchy (FILE * stream, int indent, int indented_p)
6332 fprintf (stream, "%*s", indent, "");
6336 /* Dump the offsets of all the bases rooted at BINFO to STREAM.
6337 INDENT should be zero when called from the top level; it is
6338 incremented recursively. IGO indicates the next expected BINFO in
6339 inheritance graph ordering. */
6342 dump_class_hierarchy_r (FILE *stream,
6352 indented = maybe_indent_hierarchy (stream, indent, 0);
6353 fprintf (stream, "%s (0x%lx) ",
6354 type_as_string (BINFO_TYPE (binfo), TFF_PLAIN_IDENTIFIER),
6355 (unsigned long) binfo);
6358 fprintf (stream, "alternative-path\n");
6361 igo = TREE_CHAIN (binfo);
6363 fprintf (stream, HOST_WIDE_INT_PRINT_DEC,
6364 tree_low_cst (BINFO_OFFSET (binfo), 0));
6365 if (is_empty_class (BINFO_TYPE (binfo)))
6366 fprintf (stream, " empty");
6367 else if (CLASSTYPE_NEARLY_EMPTY_P (BINFO_TYPE (binfo)))
6368 fprintf (stream, " nearly-empty");
6369 if (BINFO_VIRTUAL_P (binfo))
6370 fprintf (stream, " virtual");
6371 fprintf (stream, "\n");
6374 if (BINFO_PRIMARY_P (binfo))
6376 indented = maybe_indent_hierarchy (stream, indent + 3, indented);
6377 fprintf (stream, " primary-for %s (0x%lx)",
6378 type_as_string (BINFO_TYPE (BINFO_INHERITANCE_CHAIN (binfo)),
6379 TFF_PLAIN_IDENTIFIER),
6380 (unsigned long)BINFO_INHERITANCE_CHAIN (binfo));
6382 if (BINFO_LOST_PRIMARY_P (binfo))
6384 indented = maybe_indent_hierarchy (stream, indent + 3, indented);
6385 fprintf (stream, " lost-primary");
6388 fprintf (stream, "\n");
6390 if (!(flags & TDF_SLIM))
6394 if (BINFO_SUBVTT_INDEX (binfo))
6396 indented = maybe_indent_hierarchy (stream, indent + 3, indented);
6397 fprintf (stream, " subvttidx=%s",
6398 expr_as_string (BINFO_SUBVTT_INDEX (binfo),
6399 TFF_PLAIN_IDENTIFIER));
6401 if (BINFO_VPTR_INDEX (binfo))
6403 indented = maybe_indent_hierarchy (stream, indent + 3, indented);
6404 fprintf (stream, " vptridx=%s",
6405 expr_as_string (BINFO_VPTR_INDEX (binfo),
6406 TFF_PLAIN_IDENTIFIER));
6408 if (BINFO_VPTR_FIELD (binfo))
6410 indented = maybe_indent_hierarchy (stream, indent + 3, indented);
6411 fprintf (stream, " vbaseoffset=%s",
6412 expr_as_string (BINFO_VPTR_FIELD (binfo),
6413 TFF_PLAIN_IDENTIFIER));
6415 if (BINFO_VTABLE (binfo))
6417 indented = maybe_indent_hierarchy (stream, indent + 3, indented);
6418 fprintf (stream, " vptr=%s",
6419 expr_as_string (BINFO_VTABLE (binfo),
6420 TFF_PLAIN_IDENTIFIER));
6424 fprintf (stream, "\n");
6427 for (i = 0; BINFO_BASE_ITERATE (binfo, i, base_binfo); i++)
6428 igo = dump_class_hierarchy_r (stream, flags, base_binfo, igo, indent + 2);
6433 /* Dump the BINFO hierarchy for T. */
6436 dump_class_hierarchy_1 (FILE *stream, int flags, tree t)
6438 fprintf (stream, "Class %s\n", type_as_string (t, TFF_PLAIN_IDENTIFIER));
6439 fprintf (stream, " size=%lu align=%lu\n",
6440 (unsigned long)(tree_low_cst (TYPE_SIZE (t), 0) / BITS_PER_UNIT),
6441 (unsigned long)(TYPE_ALIGN (t) / BITS_PER_UNIT));
6442 fprintf (stream, " base size=%lu base align=%lu\n",
6443 (unsigned long)(tree_low_cst (TYPE_SIZE (CLASSTYPE_AS_BASE (t)), 0)
6445 (unsigned long)(TYPE_ALIGN (CLASSTYPE_AS_BASE (t))
6447 dump_class_hierarchy_r (stream, flags, TYPE_BINFO (t), TYPE_BINFO (t), 0);
6448 fprintf (stream, "\n");
6451 /* Debug interface to hierarchy dumping. */
6454 debug_class (tree t)
6456 dump_class_hierarchy_1 (stderr, TDF_SLIM, t);
6460 dump_class_hierarchy (tree t)
6463 FILE *stream = dump_begin (TDI_class, &flags);
6467 dump_class_hierarchy_1 (stream, flags, t);
6468 dump_end (TDI_class, stream);
6473 dump_array (FILE * stream, tree decl)
6478 tree size = TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (decl)));
6480 elt = (tree_low_cst (TYPE_SIZE (TREE_TYPE (TREE_TYPE (decl))), 0)
6482 fprintf (stream, "%s:", decl_as_string (decl, TFF_PLAIN_IDENTIFIER));
6483 fprintf (stream, " %s entries",
6484 expr_as_string (size_binop (PLUS_EXPR, size, size_one_node),
6485 TFF_PLAIN_IDENTIFIER));
6486 fprintf (stream, "\n");
6488 for (ix = 0, inits = CONSTRUCTOR_ELTS (DECL_INITIAL (decl));
6489 inits; ix++, inits = TREE_CHAIN (inits))
6490 fprintf (stream, "%-4ld %s\n", (long)(ix * elt),
6491 expr_as_string (TREE_VALUE (inits), TFF_PLAIN_IDENTIFIER));
6495 dump_vtable (tree t, tree binfo, tree vtable)
6498 FILE *stream = dump_begin (TDI_class, &flags);
6503 if (!(flags & TDF_SLIM))
6505 int ctor_vtbl_p = TYPE_BINFO (t) != binfo;
6507 fprintf (stream, "%s for %s",
6508 ctor_vtbl_p ? "Construction vtable" : "Vtable",
6509 type_as_string (BINFO_TYPE (binfo), TFF_PLAIN_IDENTIFIER));
6512 if (!BINFO_VIRTUAL_P (binfo))
6513 fprintf (stream, " (0x%lx instance)", (unsigned long)binfo);
6514 fprintf (stream, " in %s", type_as_string (t, TFF_PLAIN_IDENTIFIER));
6516 fprintf (stream, "\n");
6517 dump_array (stream, vtable);
6518 fprintf (stream, "\n");
6521 dump_end (TDI_class, stream);
6525 dump_vtt (tree t, tree vtt)
6528 FILE *stream = dump_begin (TDI_class, &flags);
6533 if (!(flags & TDF_SLIM))
6535 fprintf (stream, "VTT for %s\n",
6536 type_as_string (t, TFF_PLAIN_IDENTIFIER));
6537 dump_array (stream, vtt);
6538 fprintf (stream, "\n");
6541 dump_end (TDI_class, stream);
6544 /* Dump a function or thunk and its thunkees. */
6547 dump_thunk (FILE *stream, int indent, tree thunk)
6549 static const char spaces[] = " ";
6550 tree name = DECL_NAME (thunk);
6553 fprintf (stream, "%.*s%p %s %s", indent, spaces,
6555 !DECL_THUNK_P (thunk) ? "function"
6556 : DECL_THIS_THUNK_P (thunk) ? "this-thunk" : "covariant-thunk",
6557 name ? IDENTIFIER_POINTER (name) : "<unset>");
6558 if (DECL_THUNK_P (thunk))
6560 HOST_WIDE_INT fixed_adjust = THUNK_FIXED_OFFSET (thunk);
6561 tree virtual_adjust = THUNK_VIRTUAL_OFFSET (thunk);
6563 fprintf (stream, " fixed=" HOST_WIDE_INT_PRINT_DEC, fixed_adjust);
6564 if (!virtual_adjust)
6566 else if (DECL_THIS_THUNK_P (thunk))
6567 fprintf (stream, " vcall=" HOST_WIDE_INT_PRINT_DEC,
6568 tree_low_cst (virtual_adjust, 0));
6570 fprintf (stream, " vbase=" HOST_WIDE_INT_PRINT_DEC "(%s)",
6571 tree_low_cst (BINFO_VPTR_FIELD (virtual_adjust), 0),
6572 type_as_string (BINFO_TYPE (virtual_adjust), TFF_SCOPE));
6573 if (THUNK_ALIAS (thunk))
6574 fprintf (stream, " alias to %p", (void *)THUNK_ALIAS (thunk));
6576 fprintf (stream, "\n");
6577 for (thunks = DECL_THUNKS (thunk); thunks; thunks = TREE_CHAIN (thunks))
6578 dump_thunk (stream, indent + 2, thunks);
6581 /* Dump the thunks for FN. */
6584 debug_thunks (tree fn)
6586 dump_thunk (stderr, 0, fn);
6589 /* Virtual function table initialization. */
6591 /* Create all the necessary vtables for T and its base classes. */
6594 finish_vtbls (tree t)
6599 /* We lay out the primary and secondary vtables in one contiguous
6600 vtable. The primary vtable is first, followed by the non-virtual
6601 secondary vtables in inheritance graph order. */
6602 list = build_tree_list (BINFO_VTABLE (TYPE_BINFO (t)), NULL_TREE);
6603 accumulate_vtbl_inits (TYPE_BINFO (t), TYPE_BINFO (t),
6604 TYPE_BINFO (t), t, list);
6606 /* Then come the virtual bases, also in inheritance graph order. */
6607 for (vbase = TYPE_BINFO (t); vbase; vbase = TREE_CHAIN (vbase))
6609 if (!BINFO_VIRTUAL_P (vbase))
6611 accumulate_vtbl_inits (vbase, vbase, TYPE_BINFO (t), t, list);
6614 if (BINFO_VTABLE (TYPE_BINFO (t)))
6615 initialize_vtable (TYPE_BINFO (t), TREE_VALUE (list));
6618 /* Initialize the vtable for BINFO with the INITS. */
6621 initialize_vtable (tree binfo, tree inits)
6625 layout_vtable_decl (binfo, list_length (inits));
6626 decl = get_vtbl_decl_for_binfo (binfo);
6627 initialize_artificial_var (decl, inits);
6628 dump_vtable (BINFO_TYPE (binfo), binfo, decl);
6631 /* Build the VTT (virtual table table) for T.
6632 A class requires a VTT if it has virtual bases.
6635 1 - primary virtual pointer for complete object T
6636 2 - secondary VTTs for each direct non-virtual base of T which requires a
6638 3 - secondary virtual pointers for each direct or indirect base of T which
6639 has virtual bases or is reachable via a virtual path from T.
6640 4 - secondary VTTs for each direct or indirect virtual base of T.
6642 Secondary VTTs look like complete object VTTs without part 4. */
6652 /* Build up the initializers for the VTT. */
6654 index = size_zero_node;
6655 build_vtt_inits (TYPE_BINFO (t), t, &inits, &index);
6657 /* If we didn't need a VTT, we're done. */
6661 /* Figure out the type of the VTT. */
6662 type = build_index_type (size_int (list_length (inits) - 1));
6663 type = build_cplus_array_type (const_ptr_type_node, type);
6665 /* Now, build the VTT object itself. */
6666 vtt = build_vtable (t, get_vtt_name (t), type);
6667 initialize_artificial_var (vtt, inits);
6668 /* Add the VTT to the vtables list. */
6669 TREE_CHAIN (vtt) = TREE_CHAIN (CLASSTYPE_VTABLES (t));
6670 TREE_CHAIN (CLASSTYPE_VTABLES (t)) = vtt;
6675 /* When building a secondary VTT, BINFO_VTABLE is set to a TREE_LIST with
6676 PURPOSE the RTTI_BINFO, VALUE the real vtable pointer for this binfo,
6677 and CHAIN the vtable pointer for this binfo after construction is
6678 complete. VALUE can also be another BINFO, in which case we recurse. */
6681 binfo_ctor_vtable (tree binfo)
6687 vt = BINFO_VTABLE (binfo);
6688 if (TREE_CODE (vt) == TREE_LIST)
6689 vt = TREE_VALUE (vt);
6690 if (TREE_CODE (vt) == TREE_BINFO)
6699 /* Data for secondary VTT initialization. */
6700 typedef struct secondary_vptr_vtt_init_data_s
6702 /* Is this the primary VTT? */
6705 /* Current index into the VTT. */
6708 /* TREE_LIST of initializers built up. */
6711 /* The type being constructed by this secondary VTT. */
6712 tree type_being_constructed;
6713 } secondary_vptr_vtt_init_data;
6715 /* Recursively build the VTT-initializer for BINFO (which is in the
6716 hierarchy dominated by T). INITS points to the end of the initializer
6717 list to date. INDEX is the VTT index where the next element will be
6718 replaced. Iff BINFO is the binfo for T, this is the top level VTT (i.e.
6719 not a subvtt for some base of T). When that is so, we emit the sub-VTTs
6720 for virtual bases of T. When it is not so, we build the constructor
6721 vtables for the BINFO-in-T variant. */
6724 build_vtt_inits (tree binfo, tree t, tree *inits, tree *index)
6729 tree secondary_vptrs;
6730 secondary_vptr_vtt_init_data data;
6731 int top_level_p = SAME_BINFO_TYPE_P (BINFO_TYPE (binfo), t);
6733 /* We only need VTTs for subobjects with virtual bases. */
6734 if (!CLASSTYPE_VBASECLASSES (BINFO_TYPE (binfo)))
6737 /* We need to use a construction vtable if this is not the primary
6741 build_ctor_vtbl_group (binfo, t);
6743 /* Record the offset in the VTT where this sub-VTT can be found. */
6744 BINFO_SUBVTT_INDEX (binfo) = *index;
6747 /* Add the address of the primary vtable for the complete object. */
6748 init = binfo_ctor_vtable (binfo);
6749 *inits = build_tree_list (NULL_TREE, init);
6750 inits = &TREE_CHAIN (*inits);
6753 gcc_assert (!BINFO_VPTR_INDEX (binfo));
6754 BINFO_VPTR_INDEX (binfo) = *index;
6756 *index = size_binop (PLUS_EXPR, *index, TYPE_SIZE_UNIT (ptr_type_node));
6758 /* Recursively add the secondary VTTs for non-virtual bases. */
6759 for (i = 0; BINFO_BASE_ITERATE (binfo, i, b); ++i)
6760 if (!BINFO_VIRTUAL_P (b))
6761 inits = build_vtt_inits (b, t, inits, index);
6763 /* Add secondary virtual pointers for all subobjects of BINFO with
6764 either virtual bases or reachable along a virtual path, except
6765 subobjects that are non-virtual primary bases. */
6766 data.top_level_p = top_level_p;
6767 data.index = *index;
6769 data.type_being_constructed = BINFO_TYPE (binfo);
6771 dfs_walk_once (binfo, dfs_build_secondary_vptr_vtt_inits, NULL, &data);
6773 *index = data.index;
6775 /* The secondary vptrs come back in reverse order. After we reverse
6776 them, and add the INITS, the last init will be the first element
6778 secondary_vptrs = data.inits;
6779 if (secondary_vptrs)
6781 *inits = nreverse (secondary_vptrs);
6782 inits = &TREE_CHAIN (secondary_vptrs);
6783 gcc_assert (*inits == NULL_TREE);
6787 /* Add the secondary VTTs for virtual bases in inheritance graph
6789 for (b = TYPE_BINFO (BINFO_TYPE (binfo)); b; b = TREE_CHAIN (b))
6791 if (!BINFO_VIRTUAL_P (b))
6794 inits = build_vtt_inits (b, t, inits, index);
6797 /* Remove the ctor vtables we created. */
6798 dfs_walk_all (binfo, dfs_fixup_binfo_vtbls, NULL, binfo);
6803 /* Called from build_vtt_inits via dfs_walk. BINFO is the binfo for the base
6804 in most derived. DATA is a SECONDARY_VPTR_VTT_INIT_DATA structure. */
6807 dfs_build_secondary_vptr_vtt_inits (tree binfo, void *data_)
6809 secondary_vptr_vtt_init_data *data = (secondary_vptr_vtt_init_data *)data_;
6811 /* We don't care about bases that don't have vtables. */
6812 if (!TYPE_VFIELD (BINFO_TYPE (binfo)))
6813 return dfs_skip_bases;
6815 /* We're only interested in proper subobjects of the type being
6817 if (SAME_BINFO_TYPE_P (BINFO_TYPE (binfo), data->type_being_constructed))
6820 /* We're only interested in bases with virtual bases or reachable
6821 via a virtual path from the type being constructed. */
6822 if (!(CLASSTYPE_VBASECLASSES (BINFO_TYPE (binfo))
6823 || binfo_via_virtual (binfo, data->type_being_constructed)))
6824 return dfs_skip_bases;
6826 /* We're not interested in non-virtual primary bases. */
6827 if (!BINFO_VIRTUAL_P (binfo) && BINFO_PRIMARY_P (binfo))
6830 /* Record the index where this secondary vptr can be found. */
6831 if (data->top_level_p)
6833 gcc_assert (!BINFO_VPTR_INDEX (binfo));
6834 BINFO_VPTR_INDEX (binfo) = data->index;
6836 if (BINFO_VIRTUAL_P (binfo))
6838 /* It's a primary virtual base, and this is not a
6839 construction vtable. Find the base this is primary of in
6840 the inheritance graph, and use that base's vtable
6842 while (BINFO_PRIMARY_P (binfo))
6843 binfo = BINFO_INHERITANCE_CHAIN (binfo);
6847 /* Add the initializer for the secondary vptr itself. */
6848 data->inits = tree_cons (NULL_TREE, binfo_ctor_vtable (binfo), data->inits);
6850 /* Advance the vtt index. */
6851 data->index = size_binop (PLUS_EXPR, data->index,
6852 TYPE_SIZE_UNIT (ptr_type_node));
6857 /* Called from build_vtt_inits via dfs_walk. After building
6858 constructor vtables and generating the sub-vtt from them, we need
6859 to restore the BINFO_VTABLES that were scribbled on. DATA is the
6860 binfo of the base whose sub vtt was generated. */
6863 dfs_fixup_binfo_vtbls (tree binfo, void* data)
6865 tree vtable = BINFO_VTABLE (binfo);
6867 if (!TYPE_CONTAINS_VPTR_P (BINFO_TYPE (binfo)))
6868 /* If this class has no vtable, none of its bases do. */
6869 return dfs_skip_bases;
6872 /* This might be a primary base, so have no vtable in this
6876 /* If we scribbled the construction vtable vptr into BINFO, clear it
6878 if (TREE_CODE (vtable) == TREE_LIST
6879 && (TREE_PURPOSE (vtable) == (tree) data))
6880 BINFO_VTABLE (binfo) = TREE_CHAIN (vtable);
6885 /* Build the construction vtable group for BINFO which is in the
6886 hierarchy dominated by T. */
6889 build_ctor_vtbl_group (tree binfo, tree t)
6898 /* See if we've already created this construction vtable group. */
6899 id = mangle_ctor_vtbl_for_type (t, binfo);
6900 if (IDENTIFIER_GLOBAL_VALUE (id))
6903 gcc_assert (!SAME_BINFO_TYPE_P (BINFO_TYPE (binfo), t));
6904 /* Build a version of VTBL (with the wrong type) for use in
6905 constructing the addresses of secondary vtables in the
6906 construction vtable group. */
6907 vtbl = build_vtable (t, id, ptr_type_node);
6908 DECL_CONSTRUCTION_VTABLE_P (vtbl) = 1;
6909 list = build_tree_list (vtbl, NULL_TREE);
6910 accumulate_vtbl_inits (binfo, TYPE_BINFO (TREE_TYPE (binfo)),
6913 /* Add the vtables for each of our virtual bases using the vbase in T
6915 for (vbase = TYPE_BINFO (BINFO_TYPE (binfo));
6917 vbase = TREE_CHAIN (vbase))
6921 if (!BINFO_VIRTUAL_P (vbase))
6923 b = copied_binfo (vbase, binfo);
6925 accumulate_vtbl_inits (b, vbase, binfo, t, list);
6927 inits = TREE_VALUE (list);
6929 /* Figure out the type of the construction vtable. */
6930 type = build_index_type (size_int (list_length (inits) - 1));
6931 type = build_cplus_array_type (vtable_entry_type, type);
6932 TREE_TYPE (vtbl) = type;
6934 /* Initialize the construction vtable. */
6935 CLASSTYPE_VTABLES (t) = chainon (CLASSTYPE_VTABLES (t), vtbl);
6936 initialize_artificial_var (vtbl, inits);
6937 dump_vtable (t, binfo, vtbl);
6940 /* Add the vtbl initializers for BINFO (and its bases other than
6941 non-virtual primaries) to the list of INITS. BINFO is in the
6942 hierarchy dominated by T. RTTI_BINFO is the binfo within T of
6943 the constructor the vtbl inits should be accumulated for. (If this
6944 is the complete object vtbl then RTTI_BINFO will be TYPE_BINFO (T).)
6945 ORIG_BINFO is the binfo for this object within BINFO_TYPE (RTTI_BINFO).
6946 BINFO is the active base equivalent of ORIG_BINFO in the inheritance
6947 graph of T. Both BINFO and ORIG_BINFO will have the same BINFO_TYPE,
6948 but are not necessarily the same in terms of layout. */
6951 accumulate_vtbl_inits (tree binfo,
6959 int ctor_vtbl_p = !SAME_BINFO_TYPE_P (BINFO_TYPE (rtti_binfo), t);
6961 gcc_assert (SAME_BINFO_TYPE_P (BINFO_TYPE (binfo), BINFO_TYPE (orig_binfo)));
6963 /* If it doesn't have a vptr, we don't do anything. */
6964 if (!TYPE_CONTAINS_VPTR_P (BINFO_TYPE (binfo)))
6967 /* If we're building a construction vtable, we're not interested in
6968 subobjects that don't require construction vtables. */
6970 && !CLASSTYPE_VBASECLASSES (BINFO_TYPE (binfo))
6971 && !binfo_via_virtual (orig_binfo, BINFO_TYPE (rtti_binfo)))
6974 /* Build the initializers for the BINFO-in-T vtable. */
6976 = chainon (TREE_VALUE (inits),
6977 dfs_accumulate_vtbl_inits (binfo, orig_binfo,
6978 rtti_binfo, t, inits));
6980 /* Walk the BINFO and its bases. We walk in preorder so that as we
6981 initialize each vtable we can figure out at what offset the
6982 secondary vtable lies from the primary vtable. We can't use
6983 dfs_walk here because we need to iterate through bases of BINFO
6984 and RTTI_BINFO simultaneously. */
6985 for (i = 0; BINFO_BASE_ITERATE (binfo, i, base_binfo); ++i)
6987 /* Skip virtual bases. */
6988 if (BINFO_VIRTUAL_P (base_binfo))
6990 accumulate_vtbl_inits (base_binfo,
6991 BINFO_BASE_BINFO (orig_binfo, i),
6997 /* Called from accumulate_vtbl_inits. Returns the initializers for
6998 the BINFO vtable. */
7001 dfs_accumulate_vtbl_inits (tree binfo,
7007 tree inits = NULL_TREE;
7008 tree vtbl = NULL_TREE;
7009 int ctor_vtbl_p = !SAME_BINFO_TYPE_P (BINFO_TYPE (rtti_binfo), t);
7012 && BINFO_VIRTUAL_P (orig_binfo) && BINFO_PRIMARY_P (orig_binfo))
7014 /* In the hierarchy of BINFO_TYPE (RTTI_BINFO), this is a
7015 primary virtual base. If it is not the same primary in
7016 the hierarchy of T, we'll need to generate a ctor vtable
7017 for it, to place at its location in T. If it is the same
7018 primary, we still need a VTT entry for the vtable, but it
7019 should point to the ctor vtable for the base it is a
7020 primary for within the sub-hierarchy of RTTI_BINFO.
7022 There are three possible cases:
7024 1) We are in the same place.
7025 2) We are a primary base within a lost primary virtual base of
7027 3) We are primary to something not a base of RTTI_BINFO. */
7030 tree last = NULL_TREE;
7032 /* First, look through the bases we are primary to for RTTI_BINFO
7033 or a virtual base. */
7035 while (BINFO_PRIMARY_P (b))
7037 b = BINFO_INHERITANCE_CHAIN (b);
7039 if (BINFO_VIRTUAL_P (b) || b == rtti_binfo)
7042 /* If we run out of primary links, keep looking down our
7043 inheritance chain; we might be an indirect primary. */
7044 for (b = last; b; b = BINFO_INHERITANCE_CHAIN (b))
7045 if (BINFO_VIRTUAL_P (b) || b == rtti_binfo)
7049 /* If we found RTTI_BINFO, this is case 1. If we found a virtual
7050 base B and it is a base of RTTI_BINFO, this is case 2. In
7051 either case, we share our vtable with LAST, i.e. the
7052 derived-most base within B of which we are a primary. */
7054 || (b && binfo_for_vbase (BINFO_TYPE (b), BINFO_TYPE (rtti_binfo))))
7055 /* Just set our BINFO_VTABLE to point to LAST, as we may not have
7056 set LAST's BINFO_VTABLE yet. We'll extract the actual vptr in
7057 binfo_ctor_vtable after everything's been set up. */
7060 /* Otherwise, this is case 3 and we get our own. */
7062 else if (!BINFO_NEW_VTABLE_MARKED (orig_binfo))
7070 /* Compute the initializer for this vtable. */
7071 inits = build_vtbl_initializer (binfo, orig_binfo, t, rtti_binfo,
7074 /* Figure out the position to which the VPTR should point. */
7075 vtbl = TREE_PURPOSE (l);
7076 vtbl = build1 (ADDR_EXPR, vtbl_ptr_type_node, vtbl);
7077 index = size_binop (PLUS_EXPR,
7078 size_int (non_fn_entries),
7079 size_int (list_length (TREE_VALUE (l))));
7080 index = size_binop (MULT_EXPR,
7081 TYPE_SIZE_UNIT (vtable_entry_type),
7083 vtbl = build2 (PLUS_EXPR, TREE_TYPE (vtbl), vtbl, index);
7087 /* For a construction vtable, we can't overwrite BINFO_VTABLE.
7088 So, we make a TREE_LIST. Later, dfs_fixup_binfo_vtbls will
7089 straighten this out. */
7090 BINFO_VTABLE (binfo) = tree_cons (rtti_binfo, vtbl, BINFO_VTABLE (binfo));
7091 else if (BINFO_PRIMARY_P (binfo) && BINFO_VIRTUAL_P (binfo))
7094 /* For an ordinary vtable, set BINFO_VTABLE. */
7095 BINFO_VTABLE (binfo) = vtbl;
7100 /* Construct the initializer for BINFO's virtual function table. BINFO
7101 is part of the hierarchy dominated by T. If we're building a
7102 construction vtable, the ORIG_BINFO is the binfo we should use to
7103 find the actual function pointers to put in the vtable - but they
7104 can be overridden on the path to most-derived in the graph that
7105 ORIG_BINFO belongs. Otherwise,
7106 ORIG_BINFO should be the same as BINFO. The RTTI_BINFO is the
7107 BINFO that should be indicated by the RTTI information in the
7108 vtable; it will be a base class of T, rather than T itself, if we
7109 are building a construction vtable.
7111 The value returned is a TREE_LIST suitable for wrapping in a
7112 CONSTRUCTOR to use as the DECL_INITIAL for a vtable. If
7113 NON_FN_ENTRIES_P is not NULL, *NON_FN_ENTRIES_P is set to the
7114 number of non-function entries in the vtable.
7116 It might seem that this function should never be called with a
7117 BINFO for which BINFO_PRIMARY_P holds, the vtable for such a
7118 base is always subsumed by a derived class vtable. However, when
7119 we are building construction vtables, we do build vtables for
7120 primary bases; we need these while the primary base is being
7124 build_vtbl_initializer (tree binfo,
7128 int* non_fn_entries_p)
7137 /* Initialize VID. */
7138 memset (&vid, 0, sizeof (vid));
7141 vid.rtti_binfo = rtti_binfo;
7142 vid.last_init = &vid.inits;
7143 vid.primary_vtbl_p = SAME_BINFO_TYPE_P (BINFO_TYPE (binfo), t);
7144 vid.ctor_vtbl_p = !SAME_BINFO_TYPE_P (BINFO_TYPE (rtti_binfo), t);
7145 vid.generate_vcall_entries = true;
7146 /* The first vbase or vcall offset is at index -3 in the vtable. */
7147 vid.index = ssize_int(-3 * TARGET_VTABLE_DATA_ENTRY_DISTANCE);
7149 /* Add entries to the vtable for RTTI. */
7150 build_rtti_vtbl_entries (binfo, &vid);
7152 /* Create an array for keeping track of the functions we've
7153 processed. When we see multiple functions with the same
7154 signature, we share the vcall offsets. */
7155 VARRAY_TREE_INIT (vid.fns, 32, "fns");
7156 /* Add the vcall and vbase offset entries. */
7157 build_vcall_and_vbase_vtbl_entries (binfo, &vid);
7159 /* Clear BINFO_VTABLE_PATH_MARKED; it's set by
7160 build_vbase_offset_vtbl_entries. */
7161 for (vbases = CLASSTYPE_VBASECLASSES (t), ix = 0;
7162 VEC_iterate (tree, vbases, ix, vbinfo); ix++)
7163 BINFO_VTABLE_PATH_MARKED (vbinfo) = 0;
7165 /* If the target requires padding between data entries, add that now. */
7166 if (TARGET_VTABLE_DATA_ENTRY_DISTANCE > 1)
7170 for (prev = &vid.inits; (cur = *prev); prev = &TREE_CHAIN (cur))
7175 for (i = 1; i < TARGET_VTABLE_DATA_ENTRY_DISTANCE; ++i)
7176 add = tree_cons (NULL_TREE,
7177 build1 (NOP_EXPR, vtable_entry_type,
7184 if (non_fn_entries_p)
7185 *non_fn_entries_p = list_length (vid.inits);
7187 /* Go through all the ordinary virtual functions, building up
7189 vfun_inits = NULL_TREE;
7190 for (v = BINFO_VIRTUALS (orig_binfo); v; v = TREE_CHAIN (v))
7194 tree fn, fn_original;
7195 tree init = NULL_TREE;
7199 if (DECL_THUNK_P (fn))
7201 if (!DECL_NAME (fn))
7203 if (THUNK_ALIAS (fn))
7205 fn = THUNK_ALIAS (fn);
7208 fn_original = THUNK_TARGET (fn);
7211 /* If the only definition of this function signature along our
7212 primary base chain is from a lost primary, this vtable slot will
7213 never be used, so just zero it out. This is important to avoid
7214 requiring extra thunks which cannot be generated with the function.
7216 We first check this in update_vtable_entry_for_fn, so we handle
7217 restored primary bases properly; we also need to do it here so we
7218 zero out unused slots in ctor vtables, rather than filling themff
7219 with erroneous values (though harmless, apart from relocation
7221 for (b = binfo; ; b = get_primary_binfo (b))
7223 /* We found a defn before a lost primary; go ahead as normal. */
7224 if (look_for_overrides_here (BINFO_TYPE (b), fn_original))
7227 /* The nearest definition is from a lost primary; clear the
7229 if (BINFO_LOST_PRIMARY_P (b))
7231 init = size_zero_node;
7238 /* Pull the offset for `this', and the function to call, out of
7240 delta = BV_DELTA (v);
7241 vcall_index = BV_VCALL_INDEX (v);
7243 gcc_assert (TREE_CODE (delta) == INTEGER_CST);
7244 gcc_assert (TREE_CODE (fn) == FUNCTION_DECL);
7246 /* You can't call an abstract virtual function; it's abstract.
7247 So, we replace these functions with __pure_virtual. */
7248 if (DECL_PURE_VIRTUAL_P (fn_original))
7250 else if (!integer_zerop (delta) || vcall_index)
7252 fn = make_thunk (fn, /*this_adjusting=*/1, delta, vcall_index);
7253 if (!DECL_NAME (fn))
7256 /* Take the address of the function, considering it to be of an
7257 appropriate generic type. */
7258 init = build1 (ADDR_EXPR, vfunc_ptr_type_node, fn);
7261 /* And add it to the chain of initializers. */
7262 if (TARGET_VTABLE_USES_DESCRIPTORS)
7265 if (init == size_zero_node)
7266 for (i = 0; i < TARGET_VTABLE_USES_DESCRIPTORS; ++i)
7267 vfun_inits = tree_cons (NULL_TREE, init, vfun_inits);
7269 for (i = 0; i < TARGET_VTABLE_USES_DESCRIPTORS; ++i)
7271 tree fdesc = build2 (FDESC_EXPR, vfunc_ptr_type_node,
7272 TREE_OPERAND (init, 0),
7273 build_int_cst (NULL_TREE, i));
7274 TREE_CONSTANT (fdesc) = 1;
7275 TREE_INVARIANT (fdesc) = 1;
7277 vfun_inits = tree_cons (NULL_TREE, fdesc, vfun_inits);
7281 vfun_inits = tree_cons (NULL_TREE, init, vfun_inits);
7284 /* The initializers for virtual functions were built up in reverse
7285 order; straighten them out now. */
7286 vfun_inits = nreverse (vfun_inits);
7288 /* The negative offset initializers are also in reverse order. */
7289 vid.inits = nreverse (vid.inits);
7291 /* Chain the two together. */
7292 return chainon (vid.inits, vfun_inits);
7295 /* Adds to vid->inits the initializers for the vbase and vcall
7296 offsets in BINFO, which is in the hierarchy dominated by T. */
7299 build_vcall_and_vbase_vtbl_entries (tree binfo, vtbl_init_data* vid)
7303 /* If this is a derived class, we must first create entries
7304 corresponding to the primary base class. */
7305 b = get_primary_binfo (binfo);
7307 build_vcall_and_vbase_vtbl_entries (b, vid);
7309 /* Add the vbase entries for this base. */
7310 build_vbase_offset_vtbl_entries (binfo, vid);
7311 /* Add the vcall entries for this base. */
7312 build_vcall_offset_vtbl_entries (binfo, vid);
7315 /* Returns the initializers for the vbase offset entries in the vtable
7316 for BINFO (which is part of the class hierarchy dominated by T), in
7317 reverse order. VBASE_OFFSET_INDEX gives the vtable index
7318 where the next vbase offset will go. */
7321 build_vbase_offset_vtbl_entries (tree binfo, vtbl_init_data* vid)
7325 tree non_primary_binfo;
7327 /* If there are no virtual baseclasses, then there is nothing to
7329 if (!CLASSTYPE_VBASECLASSES (BINFO_TYPE (binfo)))
7334 /* We might be a primary base class. Go up the inheritance hierarchy
7335 until we find the most derived class of which we are a primary base:
7336 it is the offset of that which we need to use. */
7337 non_primary_binfo = binfo;
7338 while (BINFO_INHERITANCE_CHAIN (non_primary_binfo))
7342 /* If we have reached a virtual base, then it must be a primary
7343 base (possibly multi-level) of vid->binfo, or we wouldn't
7344 have called build_vcall_and_vbase_vtbl_entries for it. But it
7345 might be a lost primary, so just skip down to vid->binfo. */
7346 if (BINFO_VIRTUAL_P (non_primary_binfo))
7348 non_primary_binfo = vid->binfo;
7352 b = BINFO_INHERITANCE_CHAIN (non_primary_binfo);
7353 if (get_primary_binfo (b) != non_primary_binfo)
7355 non_primary_binfo = b;
7358 /* Go through the virtual bases, adding the offsets. */
7359 for (vbase = TYPE_BINFO (BINFO_TYPE (binfo));
7361 vbase = TREE_CHAIN (vbase))
7366 if (!BINFO_VIRTUAL_P (vbase))
7369 /* Find the instance of this virtual base in the complete
7371 b = copied_binfo (vbase, binfo);
7373 /* If we've already got an offset for this virtual base, we
7374 don't need another one. */
7375 if (BINFO_VTABLE_PATH_MARKED (b))
7377 BINFO_VTABLE_PATH_MARKED (b) = 1;
7379 /* Figure out where we can find this vbase offset. */
7380 delta = size_binop (MULT_EXPR,
7383 TYPE_SIZE_UNIT (vtable_entry_type)));
7384 if (vid->primary_vtbl_p)
7385 BINFO_VPTR_FIELD (b) = delta;
7387 if (binfo != TYPE_BINFO (t))
7388 /* The vbase offset had better be the same. */
7389 gcc_assert (tree_int_cst_equal (delta, BINFO_VPTR_FIELD (vbase)));
7391 /* The next vbase will come at a more negative offset. */
7392 vid->index = size_binop (MINUS_EXPR, vid->index,
7393 ssize_int (TARGET_VTABLE_DATA_ENTRY_DISTANCE));
7395 /* The initializer is the delta from BINFO to this virtual base.
7396 The vbase offsets go in reverse inheritance-graph order, and
7397 we are walking in inheritance graph order so these end up in
7399 delta = size_diffop (BINFO_OFFSET (b), BINFO_OFFSET (non_primary_binfo));
7402 = build_tree_list (NULL_TREE,
7403 fold (build1 (NOP_EXPR,
7406 vid->last_init = &TREE_CHAIN (*vid->last_init);
7410 /* Adds the initializers for the vcall offset entries in the vtable
7411 for BINFO (which is part of the class hierarchy dominated by VID->DERIVED)
7415 build_vcall_offset_vtbl_entries (tree binfo, vtbl_init_data* vid)
7417 /* We only need these entries if this base is a virtual base. We
7418 compute the indices -- but do not add to the vtable -- when
7419 building the main vtable for a class. */
7420 if (BINFO_VIRTUAL_P (binfo) || binfo == TYPE_BINFO (vid->derived))
7422 /* We need a vcall offset for each of the virtual functions in this
7423 vtable. For example:
7425 class A { virtual void f (); };
7426 class B1 : virtual public A { virtual void f (); };
7427 class B2 : virtual public A { virtual void f (); };
7428 class C: public B1, public B2 { virtual void f (); };
7430 A C object has a primary base of B1, which has a primary base of A. A
7431 C also has a secondary base of B2, which no longer has a primary base
7432 of A. So the B2-in-C construction vtable needs a secondary vtable for
7433 A, which will adjust the A* to a B2* to call f. We have no way of
7434 knowing what (or even whether) this offset will be when we define B2,
7435 so we store this "vcall offset" in the A sub-vtable and look it up in
7436 a "virtual thunk" for B2::f.
7438 We need entries for all the functions in our primary vtable and
7439 in our non-virtual bases' secondary vtables. */
7441 /* If we are just computing the vcall indices -- but do not need
7442 the actual entries -- not that. */
7443 if (!BINFO_VIRTUAL_P (binfo))
7444 vid->generate_vcall_entries = false;
7445 /* Now, walk through the non-virtual bases, adding vcall offsets. */
7446 add_vcall_offset_vtbl_entries_r (binfo, vid);
7450 /* Build vcall offsets, starting with those for BINFO. */
7453 add_vcall_offset_vtbl_entries_r (tree binfo, vtbl_init_data* vid)
7459 /* Don't walk into virtual bases -- except, of course, for the
7460 virtual base for which we are building vcall offsets. Any
7461 primary virtual base will have already had its offsets generated
7462 through the recursion in build_vcall_and_vbase_vtbl_entries. */
7463 if (BINFO_VIRTUAL_P (binfo) && vid->vbase != binfo)
7466 /* If BINFO has a primary base, process it first. */
7467 primary_binfo = get_primary_binfo (binfo);
7469 add_vcall_offset_vtbl_entries_r (primary_binfo, vid);
7471 /* Add BINFO itself to the list. */
7472 add_vcall_offset_vtbl_entries_1 (binfo, vid);
7474 /* Scan the non-primary bases of BINFO. */
7475 for (i = 0; BINFO_BASE_ITERATE (binfo, i, base_binfo); ++i)
7476 if (base_binfo != primary_binfo)
7477 add_vcall_offset_vtbl_entries_r (base_binfo, vid);
7480 /* Called from build_vcall_offset_vtbl_entries_r. */
7483 add_vcall_offset_vtbl_entries_1 (tree binfo, vtbl_init_data* vid)
7485 /* Make entries for the rest of the virtuals. */
7486 if (abi_version_at_least (2))
7490 /* The ABI requires that the methods be processed in declaration
7491 order. G++ 3.2 used the order in the vtable. */
7492 for (orig_fn = TYPE_METHODS (BINFO_TYPE (binfo));
7494 orig_fn = TREE_CHAIN (orig_fn))
7495 if (DECL_VINDEX (orig_fn))
7496 add_vcall_offset (orig_fn, binfo, vid);
7500 tree derived_virtuals;
7503 /* If BINFO is a primary base, the most derived class which has
7504 BINFO as a primary base; otherwise, just BINFO. */
7505 tree non_primary_binfo;
7507 /* We might be a primary base class. Go up the inheritance hierarchy
7508 until we find the most derived class of which we are a primary base:
7509 it is the BINFO_VIRTUALS there that we need to consider. */
7510 non_primary_binfo = binfo;
7511 while (BINFO_INHERITANCE_CHAIN (non_primary_binfo))
7515 /* If we have reached a virtual base, then it must be vid->vbase,
7516 because we ignore other virtual bases in
7517 add_vcall_offset_vtbl_entries_r. In turn, it must be a primary
7518 base (possibly multi-level) of vid->binfo, or we wouldn't
7519 have called build_vcall_and_vbase_vtbl_entries for it. But it
7520 might be a lost primary, so just skip down to vid->binfo. */
7521 if (BINFO_VIRTUAL_P (non_primary_binfo))
7523 gcc_assert (non_primary_binfo == vid->vbase);
7524 non_primary_binfo = vid->binfo;
7528 b = BINFO_INHERITANCE_CHAIN (non_primary_binfo);
7529 if (get_primary_binfo (b) != non_primary_binfo)
7531 non_primary_binfo = b;
7534 if (vid->ctor_vtbl_p)
7535 /* For a ctor vtable we need the equivalent binfo within the hierarchy
7536 where rtti_binfo is the most derived type. */
7538 = original_binfo (non_primary_binfo, vid->rtti_binfo);
7540 for (base_virtuals = BINFO_VIRTUALS (binfo),
7541 derived_virtuals = BINFO_VIRTUALS (non_primary_binfo),
7542 orig_virtuals = BINFO_VIRTUALS (TYPE_BINFO (BINFO_TYPE (binfo)));
7544 base_virtuals = TREE_CHAIN (base_virtuals),
7545 derived_virtuals = TREE_CHAIN (derived_virtuals),
7546 orig_virtuals = TREE_CHAIN (orig_virtuals))
7550 /* Find the declaration that originally caused this function to
7551 be present in BINFO_TYPE (binfo). */
7552 orig_fn = BV_FN (orig_virtuals);
7554 /* When processing BINFO, we only want to generate vcall slots for
7555 function slots introduced in BINFO. So don't try to generate
7556 one if the function isn't even defined in BINFO. */
7557 if (!SAME_BINFO_TYPE_P (BINFO_TYPE (binfo), DECL_CONTEXT (orig_fn)))
7560 add_vcall_offset (orig_fn, binfo, vid);
7565 /* Add a vcall offset entry for ORIG_FN to the vtable. */
7568 add_vcall_offset (tree orig_fn, tree binfo, vtbl_init_data *vid)
7573 /* If there is already an entry for a function with the same
7574 signature as FN, then we do not need a second vcall offset.
7575 Check the list of functions already present in the derived
7577 for (i = 0; i < VARRAY_ACTIVE_SIZE (vid->fns); ++i)
7581 derived_entry = VARRAY_TREE (vid->fns, i);
7582 if (same_signature_p (derived_entry, orig_fn)
7583 /* We only use one vcall offset for virtual destructors,
7584 even though there are two virtual table entries. */
7585 || (DECL_DESTRUCTOR_P (derived_entry)
7586 && DECL_DESTRUCTOR_P (orig_fn)))
7590 /* If we are building these vcall offsets as part of building
7591 the vtable for the most derived class, remember the vcall
7593 if (vid->binfo == TYPE_BINFO (vid->derived))
7595 tree_pair_p elt = VEC_safe_push (tree_pair_s,
7596 CLASSTYPE_VCALL_INDICES (vid->derived),
7598 elt->purpose = orig_fn;
7599 elt->value = vid->index;
7602 /* The next vcall offset will be found at a more negative
7604 vid->index = size_binop (MINUS_EXPR, vid->index,
7605 ssize_int (TARGET_VTABLE_DATA_ENTRY_DISTANCE));
7607 /* Keep track of this function. */
7608 VARRAY_PUSH_TREE (vid->fns, orig_fn);
7610 if (vid->generate_vcall_entries)
7615 /* Find the overriding function. */
7616 fn = find_final_overrider (vid->rtti_binfo, binfo, orig_fn);
7617 if (fn == error_mark_node)
7618 vcall_offset = build1 (NOP_EXPR, vtable_entry_type,
7622 base = TREE_VALUE (fn);
7624 /* The vbase we're working on is a primary base of
7625 vid->binfo. But it might be a lost primary, so its
7626 BINFO_OFFSET might be wrong, so we just use the
7627 BINFO_OFFSET from vid->binfo. */
7628 vcall_offset = size_diffop (BINFO_OFFSET (base),
7629 BINFO_OFFSET (vid->binfo));
7630 vcall_offset = fold (build1 (NOP_EXPR, vtable_entry_type,
7633 /* Add the initializer to the vtable. */
7634 *vid->last_init = build_tree_list (NULL_TREE, vcall_offset);
7635 vid->last_init = &TREE_CHAIN (*vid->last_init);
7639 /* Return vtbl initializers for the RTTI entries corresponding to the
7640 BINFO's vtable. The RTTI entries should indicate the object given
7641 by VID->rtti_binfo. */
7644 build_rtti_vtbl_entries (tree binfo, vtbl_init_data* vid)
7653 basetype = BINFO_TYPE (binfo);
7654 t = BINFO_TYPE (vid->rtti_binfo);
7656 /* To find the complete object, we will first convert to our most
7657 primary base, and then add the offset in the vtbl to that value. */
7659 while (CLASSTYPE_HAS_PRIMARY_BASE_P (BINFO_TYPE (b))
7660 && !BINFO_LOST_PRIMARY_P (b))
7664 primary_base = get_primary_binfo (b);
7665 gcc_assert (BINFO_PRIMARY_P (primary_base)
7666 && BINFO_INHERITANCE_CHAIN (primary_base) == b);
7669 offset = size_diffop (BINFO_OFFSET (vid->rtti_binfo), BINFO_OFFSET (b));
7671 /* The second entry is the address of the typeinfo object. */
7673 decl = build_address (get_tinfo_decl (t));
7675 decl = integer_zero_node;
7677 /* Convert the declaration to a type that can be stored in the
7679 init = build_nop (vfunc_ptr_type_node, decl);
7680 *vid->last_init = build_tree_list (NULL_TREE, init);
7681 vid->last_init = &TREE_CHAIN (*vid->last_init);
7683 /* Add the offset-to-top entry. It comes earlier in the vtable that
7684 the the typeinfo entry. Convert the offset to look like a
7685 function pointer, so that we can put it in the vtable. */
7686 init = build_nop (vfunc_ptr_type_node, offset);
7687 *vid->last_init = build_tree_list (NULL_TREE, init);
7688 vid->last_init = &TREE_CHAIN (*vid->last_init);
7691 /* Fold a OBJ_TYPE_REF expression to the address of a function.
7692 KNOWN_TYPE carries the true type of OBJ_TYPE_REF_OBJECT(REF). */
7695 cp_fold_obj_type_ref (tree ref, tree known_type)
7697 HOST_WIDE_INT index = tree_low_cst (OBJ_TYPE_REF_TOKEN (ref), 1);
7698 HOST_WIDE_INT i = 0;
7699 tree v = BINFO_VIRTUALS (TYPE_BINFO (known_type));
7704 i += (TARGET_VTABLE_USES_DESCRIPTORS
7705 ? TARGET_VTABLE_USES_DESCRIPTORS : 1);
7711 #ifdef ENABLE_CHECKING
7712 gcc_assert (tree_int_cst_equal (OBJ_TYPE_REF_TOKEN (ref),
7713 DECL_VINDEX (fndecl)));
7716 return build_address (fndecl);