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, 2005, 2007
4 Free Software Foundation, Inc.
5 Contributed by Michael Tiemann (tiemann@cygnus.com)
7 This file is part of GCC.
9 GCC is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 3, or (at your option)
14 GCC is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
19 You should have received a copy of the GNU General Public License
20 along with GCC; see the file COPYING3. If not see
21 <http://www.gnu.org/licenses/>. */
24 /* High-level class interface. */
28 #include "coretypes.h"
39 #include "tree-dump.h"
41 /* The number of nested classes being processed. If we are not in the
42 scope of any class, this is zero. */
44 int current_class_depth;
46 /* In order to deal with nested classes, we keep a stack of classes.
47 The topmost entry is the innermost class, and is the entry at index
48 CURRENT_CLASS_DEPTH */
50 typedef struct class_stack_node {
51 /* The name of the class. */
54 /* The _TYPE node for the class. */
57 /* The access specifier pending for new declarations in the scope of
61 /* If were defining TYPE, the names used in this class. */
62 splay_tree names_used;
64 /* Nonzero if this class is no longer open, because of a call to
67 }* class_stack_node_t;
69 typedef struct vtbl_init_data_s
71 /* The base for which we're building initializers. */
73 /* The type of the most-derived type. */
75 /* The binfo for the dynamic type. This will be TYPE_BINFO (derived),
76 unless ctor_vtbl_p is true. */
78 /* The negative-index vtable initializers built up so far. These
79 are in order from least negative index to most negative index. */
81 /* The last (i.e., most negative) entry in INITS. */
83 /* The binfo for the virtual base for which we're building
84 vcall offset initializers. */
86 /* The functions in vbase for which we have already provided vcall
89 /* The vtable index of the next vcall or vbase offset. */
91 /* Nonzero if we are building the initializer for the primary
94 /* Nonzero if we are building the initializer for a construction
97 /* True when adding vcall offset entries to the vtable. False when
98 merely computing the indices. */
99 bool generate_vcall_entries;
102 /* The type of a function passed to walk_subobject_offsets. */
103 typedef int (*subobject_offset_fn) (tree, tree, splay_tree);
105 /* The stack itself. This is a dynamically resized array. The
106 number of elements allocated is CURRENT_CLASS_STACK_SIZE. */
107 static int current_class_stack_size;
108 static class_stack_node_t current_class_stack;
110 /* The size of the largest empty class seen in this translation unit. */
111 static GTY (()) tree sizeof_biggest_empty_class;
113 /* An array of all local classes present in this translation unit, in
114 declaration order. */
115 VEC(tree,gc) *local_classes;
117 static tree get_vfield_name (tree);
118 static void finish_struct_anon (tree);
119 static tree get_vtable_name (tree);
120 static tree get_basefndecls (tree, tree);
121 static int build_primary_vtable (tree, tree);
122 static int build_secondary_vtable (tree);
123 static void finish_vtbls (tree);
124 static void modify_vtable_entry (tree, tree, tree, tree, tree *);
125 static void finish_struct_bits (tree);
126 static int alter_access (tree, tree, tree);
127 static void handle_using_decl (tree, tree);
128 static tree dfs_modify_vtables (tree, void *);
129 static tree modify_all_vtables (tree, tree);
130 static void determine_primary_bases (tree);
131 static void finish_struct_methods (tree);
132 static void maybe_warn_about_overly_private_class (tree);
133 static int method_name_cmp (const void *, const void *);
134 static int resort_method_name_cmp (const void *, const void *);
135 static void add_implicitly_declared_members (tree, int, int);
136 static tree fixed_type_or_null (tree, int *, int *);
137 static tree build_simple_base_path (tree expr, tree binfo);
138 static tree build_vtbl_ref_1 (tree, tree);
139 static tree build_vtbl_initializer (tree, tree, tree, tree, int *);
140 static int count_fields (tree);
141 static int add_fields_to_record_type (tree, struct sorted_fields_type*, int);
142 static bool check_bitfield_decl (tree);
143 static void check_field_decl (tree, tree, int *, int *, int *);
144 static void check_field_decls (tree, tree *, int *, int *);
145 static tree *build_base_field (record_layout_info, tree, splay_tree, tree *);
146 static void build_base_fields (record_layout_info, splay_tree, tree *);
147 static void check_methods (tree);
148 static void remove_zero_width_bit_fields (tree);
149 static void check_bases (tree, int *, int *);
150 static void check_bases_and_members (tree);
151 static tree create_vtable_ptr (tree, tree *);
152 static void include_empty_classes (record_layout_info);
153 static void layout_class_type (tree, tree *);
154 static void fixup_pending_inline (tree);
155 static void fixup_inline_methods (tree);
156 static void propagate_binfo_offsets (tree, tree);
157 static void layout_virtual_bases (record_layout_info, splay_tree);
158 static void build_vbase_offset_vtbl_entries (tree, vtbl_init_data *);
159 static void add_vcall_offset_vtbl_entries_r (tree, vtbl_init_data *);
160 static void add_vcall_offset_vtbl_entries_1 (tree, vtbl_init_data *);
161 static void build_vcall_offset_vtbl_entries (tree, vtbl_init_data *);
162 static void add_vcall_offset (tree, tree, vtbl_init_data *);
163 static void layout_vtable_decl (tree, int);
164 static tree dfs_find_final_overrider_pre (tree, void *);
165 static tree dfs_find_final_overrider_post (tree, void *);
166 static tree find_final_overrider (tree, tree, tree);
167 static int make_new_vtable (tree, tree);
168 static tree get_primary_binfo (tree);
169 static int maybe_indent_hierarchy (FILE *, int, int);
170 static tree dump_class_hierarchy_r (FILE *, int, tree, tree, int);
171 static void dump_class_hierarchy (tree);
172 static void dump_class_hierarchy_1 (FILE *, int, tree);
173 static void dump_array (FILE *, tree);
174 static void dump_vtable (tree, tree, tree);
175 static void dump_vtt (tree, tree);
176 static void dump_thunk (FILE *, int, tree);
177 static tree build_vtable (tree, tree, tree);
178 static void initialize_vtable (tree, tree);
179 static void layout_nonempty_base_or_field (record_layout_info,
180 tree, tree, splay_tree);
181 static tree end_of_class (tree, int);
182 static bool layout_empty_base (record_layout_info, tree, tree, splay_tree);
183 static void accumulate_vtbl_inits (tree, tree, tree, tree, tree);
184 static tree dfs_accumulate_vtbl_inits (tree, tree, tree, tree,
186 static void build_rtti_vtbl_entries (tree, vtbl_init_data *);
187 static void build_vcall_and_vbase_vtbl_entries (tree, vtbl_init_data *);
188 static void clone_constructors_and_destructors (tree);
189 static tree build_clone (tree, tree);
190 static void update_vtable_entry_for_fn (tree, tree, tree, tree *, unsigned);
191 static void build_ctor_vtbl_group (tree, tree);
192 static void build_vtt (tree);
193 static tree binfo_ctor_vtable (tree);
194 static tree *build_vtt_inits (tree, tree, tree *, tree *);
195 static tree dfs_build_secondary_vptr_vtt_inits (tree, void *);
196 static tree dfs_fixup_binfo_vtbls (tree, void *);
197 static int record_subobject_offset (tree, tree, splay_tree);
198 static int check_subobject_offset (tree, tree, splay_tree);
199 static int walk_subobject_offsets (tree, subobject_offset_fn,
200 tree, splay_tree, tree, int);
201 static void record_subobject_offsets (tree, tree, splay_tree, bool);
202 static int layout_conflict_p (tree, tree, splay_tree, int);
203 static int splay_tree_compare_integer_csts (splay_tree_key k1,
205 static void warn_about_ambiguous_bases (tree);
206 static bool type_requires_array_cookie (tree);
207 static bool contains_empty_class_p (tree);
208 static bool base_derived_from (tree, tree);
209 static int empty_base_at_nonzero_offset_p (tree, tree, splay_tree);
210 static tree end_of_base (tree);
211 static tree get_vcall_index (tree, tree);
213 /* Variables shared between class.c and call.c. */
215 #ifdef GATHER_STATISTICS
217 int n_vtable_entries = 0;
218 int n_vtable_searches = 0;
219 int n_vtable_elems = 0;
220 int n_convert_harshness = 0;
221 int n_compute_conversion_costs = 0;
222 int n_inner_fields_searched = 0;
225 /* Convert to or from a base subobject. EXPR is an expression of type
226 `A' or `A*', an expression of type `B' or `B*' is returned. To
227 convert A to a base B, CODE is PLUS_EXPR and BINFO is the binfo for
228 the B base instance within A. To convert base A to derived B, CODE
229 is MINUS_EXPR and BINFO is the binfo for the A instance within B.
230 In this latter case, A must not be a morally virtual base of B.
231 NONNULL is true if EXPR is known to be non-NULL (this is only
232 needed when EXPR is of pointer type). CV qualifiers are preserved
236 build_base_path (enum tree_code code,
241 tree v_binfo = NULL_TREE;
242 tree d_binfo = NULL_TREE;
246 tree null_test = NULL;
247 tree ptr_target_type;
249 int want_pointer = TREE_CODE (TREE_TYPE (expr)) == POINTER_TYPE;
250 bool has_empty = false;
253 if (expr == error_mark_node || binfo == error_mark_node || !binfo)
254 return error_mark_node;
256 for (probe = binfo; probe; probe = BINFO_INHERITANCE_CHAIN (probe))
259 if (is_empty_class (BINFO_TYPE (probe)))
261 if (!v_binfo && BINFO_VIRTUAL_P (probe))
265 probe = TYPE_MAIN_VARIANT (TREE_TYPE (expr));
267 probe = TYPE_MAIN_VARIANT (TREE_TYPE (probe));
269 gcc_assert ((code == MINUS_EXPR
270 && SAME_BINFO_TYPE_P (BINFO_TYPE (binfo), probe))
271 || (code == PLUS_EXPR
272 && SAME_BINFO_TYPE_P (BINFO_TYPE (d_binfo), probe)));
274 if (binfo == d_binfo)
278 if (code == MINUS_EXPR && v_binfo)
280 error ("cannot convert from base %qT to derived type %qT via virtual base %qT",
281 BINFO_TYPE (binfo), BINFO_TYPE (d_binfo), BINFO_TYPE (v_binfo));
282 return error_mark_node;
286 /* This must happen before the call to save_expr. */
287 expr = build_unary_op (ADDR_EXPR, expr, 0);
289 offset = BINFO_OFFSET (binfo);
290 fixed_type_p = resolves_to_fixed_type_p (expr, &nonnull);
291 target_type = code == PLUS_EXPR ? BINFO_TYPE (binfo) : BINFO_TYPE (d_binfo);
293 /* Do we need to look in the vtable for the real offset? */
294 virtual_access = (v_binfo && fixed_type_p <= 0);
296 /* Don't bother with the calculations inside sizeof; they'll ICE if the
297 source type is incomplete and the pointer value doesn't matter. */
300 expr = build_nop (build_pointer_type (target_type), expr);
302 expr = build_indirect_ref (expr, NULL);
306 /* Do we need to check for a null pointer? */
307 if (want_pointer && !nonnull)
309 /* If we know the conversion will not actually change the value
310 of EXPR, then we can avoid testing the expression for NULL.
311 We have to avoid generating a COMPONENT_REF for a base class
312 field, because other parts of the compiler know that such
313 expressions are always non-NULL. */
314 if (!virtual_access && integer_zerop (offset))
317 /* TARGET_TYPE has been extracted from BINFO, and, is
318 therefore always cv-unqualified. Extract the
319 cv-qualifiers from EXPR so that the expression returned
320 matches the input. */
321 class_type = TREE_TYPE (TREE_TYPE (expr));
323 = cp_build_qualified_type (target_type,
324 cp_type_quals (class_type));
325 return build_nop (build_pointer_type (target_type), expr);
327 null_test = error_mark_node;
330 /* Protect against multiple evaluation if necessary. */
331 if (TREE_SIDE_EFFECTS (expr) && (null_test || virtual_access))
332 expr = save_expr (expr);
334 /* Now that we've saved expr, build the real null test. */
337 tree zero = cp_convert (TREE_TYPE (expr), integer_zero_node);
338 null_test = fold_build2 (NE_EXPR, boolean_type_node,
342 /* If this is a simple base reference, express it as a COMPONENT_REF. */
343 if (code == PLUS_EXPR && !virtual_access
344 /* We don't build base fields for empty bases, and they aren't very
345 interesting to the optimizers anyway. */
348 expr = build_indirect_ref (expr, NULL);
349 expr = build_simple_base_path (expr, binfo);
351 expr = build_address (expr);
352 target_type = TREE_TYPE (expr);
358 /* Going via virtual base V_BINFO. We need the static offset
359 from V_BINFO to BINFO, and the dynamic offset from D_BINFO to
360 V_BINFO. That offset is an entry in D_BINFO's vtable. */
363 if (fixed_type_p < 0 && in_base_initializer)
365 /* In a base member initializer, we cannot rely on the
366 vtable being set up. We have to indirect via the
370 t = TREE_TYPE (TYPE_VFIELD (current_class_type));
371 t = build_pointer_type (t);
372 v_offset = convert (t, current_vtt_parm);
373 v_offset = build_indirect_ref (v_offset, NULL);
376 v_offset = build_vfield_ref (build_indirect_ref (expr, NULL),
377 TREE_TYPE (TREE_TYPE (expr)));
379 v_offset = build2 (POINTER_PLUS_EXPR, TREE_TYPE (v_offset),
380 v_offset, fold_convert (sizetype, BINFO_VPTR_FIELD (v_binfo)));
381 v_offset = build1 (NOP_EXPR,
382 build_pointer_type (ptrdiff_type_node),
384 v_offset = build_indirect_ref (v_offset, NULL);
385 TREE_CONSTANT (v_offset) = 1;
386 TREE_INVARIANT (v_offset) = 1;
388 offset = convert_to_integer (ptrdiff_type_node,
390 BINFO_OFFSET (v_binfo)));
392 if (!integer_zerop (offset))
393 v_offset = build2 (code, ptrdiff_type_node, v_offset, offset);
395 if (fixed_type_p < 0)
396 /* Negative fixed_type_p means this is a constructor or destructor;
397 virtual base layout is fixed in in-charge [cd]tors, but not in
399 offset = build3 (COND_EXPR, ptrdiff_type_node,
400 build2 (EQ_EXPR, boolean_type_node,
401 current_in_charge_parm, integer_zero_node),
403 convert_to_integer (ptrdiff_type_node,
404 BINFO_OFFSET (binfo)));
409 target_type = cp_build_qualified_type
410 (target_type, cp_type_quals (TREE_TYPE (TREE_TYPE (expr))));
411 ptr_target_type = build_pointer_type (target_type);
413 target_type = ptr_target_type;
415 expr = build1 (NOP_EXPR, ptr_target_type, expr);
417 if (!integer_zerop (offset))
419 offset = fold_convert (sizetype, offset);
420 if (code == MINUS_EXPR)
421 offset = fold_build1 (NEGATE_EXPR, sizetype, offset);
422 expr = build2 (POINTER_PLUS_EXPR, ptr_target_type, expr, offset);
428 expr = build_indirect_ref (expr, NULL);
432 expr = fold_build3 (COND_EXPR, target_type, null_test, expr,
433 fold_build1 (NOP_EXPR, target_type,
439 /* Subroutine of build_base_path; EXPR and BINFO are as in that function.
440 Perform a derived-to-base conversion by recursively building up a
441 sequence of COMPONENT_REFs to the appropriate base fields. */
444 build_simple_base_path (tree expr, tree binfo)
446 tree type = BINFO_TYPE (binfo);
447 tree d_binfo = BINFO_INHERITANCE_CHAIN (binfo);
450 if (d_binfo == NULL_TREE)
454 gcc_assert (TYPE_MAIN_VARIANT (TREE_TYPE (expr)) == type);
456 /* Transform `(a, b).x' into `(*(a, &b)).x', `(a ? b : c).x'
457 into `(*(a ? &b : &c)).x', and so on. A COND_EXPR is only
458 an lvalue in the front end; only _DECLs and _REFs are lvalues
460 temp = unary_complex_lvalue (ADDR_EXPR, expr);
462 expr = build_indirect_ref (temp, NULL);
468 expr = build_simple_base_path (expr, d_binfo);
470 for (field = TYPE_FIELDS (BINFO_TYPE (d_binfo));
471 field; field = TREE_CHAIN (field))
472 /* Is this the base field created by build_base_field? */
473 if (TREE_CODE (field) == FIELD_DECL
474 && DECL_FIELD_IS_BASE (field)
475 && TREE_TYPE (field) == type)
477 /* We don't use build_class_member_access_expr here, as that
478 has unnecessary checks, and more importantly results in
479 recursive calls to dfs_walk_once. */
480 int type_quals = cp_type_quals (TREE_TYPE (expr));
482 expr = build3 (COMPONENT_REF,
483 cp_build_qualified_type (type, type_quals),
484 expr, field, NULL_TREE);
485 expr = fold_if_not_in_template (expr);
487 /* Mark the expression const or volatile, as appropriate.
488 Even though we've dealt with the type above, we still have
489 to mark the expression itself. */
490 if (type_quals & TYPE_QUAL_CONST)
491 TREE_READONLY (expr) = 1;
492 if (type_quals & TYPE_QUAL_VOLATILE)
493 TREE_THIS_VOLATILE (expr) = 1;
498 /* Didn't find the base field?!? */
502 /* Convert OBJECT to the base TYPE. OBJECT is an expression whose
503 type is a class type or a pointer to a class type. In the former
504 case, TYPE is also a class type; in the latter it is another
505 pointer type. If CHECK_ACCESS is true, an error message is emitted
506 if TYPE is inaccessible. If OBJECT has pointer type, the value is
507 assumed to be non-NULL. */
510 convert_to_base (tree object, tree type, bool check_access, bool nonnull)
515 if (TYPE_PTR_P (TREE_TYPE (object)))
517 object_type = TREE_TYPE (TREE_TYPE (object));
518 type = TREE_TYPE (type);
521 object_type = TREE_TYPE (object);
523 binfo = lookup_base (object_type, type,
524 check_access ? ba_check : ba_unique,
526 if (!binfo || binfo == error_mark_node)
527 return error_mark_node;
529 return build_base_path (PLUS_EXPR, object, binfo, nonnull);
532 /* EXPR is an expression with unqualified class type. BASE is a base
533 binfo of that class type. Returns EXPR, converted to the BASE
534 type. This function assumes that EXPR is the most derived class;
535 therefore virtual bases can be found at their static offsets. */
538 convert_to_base_statically (tree expr, tree base)
542 expr_type = TREE_TYPE (expr);
543 if (!SAME_BINFO_TYPE_P (BINFO_TYPE (base), expr_type))
547 pointer_type = build_pointer_type (expr_type);
549 /* We use fold_build2 and fold_convert below to simplify the trees
550 provided to the optimizers. It is not safe to call these functions
551 when processing a template because they do not handle C++-specific
553 gcc_assert (!processing_template_decl);
554 expr = build_unary_op (ADDR_EXPR, expr, /*noconvert=*/1);
555 if (!integer_zerop (BINFO_OFFSET (base)))
556 expr = fold_build2 (POINTER_PLUS_EXPR, pointer_type, expr,
557 fold_convert (sizetype, BINFO_OFFSET (base)));
558 expr = fold_convert (build_pointer_type (BINFO_TYPE (base)), expr);
559 expr = build_fold_indirect_ref (expr);
567 build_vfield_ref (tree datum, tree type)
569 tree vfield, vcontext;
571 if (datum == error_mark_node)
572 return error_mark_node;
574 /* First, convert to the requested type. */
575 if (!same_type_ignoring_top_level_qualifiers_p (TREE_TYPE (datum), type))
576 datum = convert_to_base (datum, type, /*check_access=*/false,
579 /* Second, the requested type may not be the owner of its own vptr.
580 If not, convert to the base class that owns it. We cannot use
581 convert_to_base here, because VCONTEXT may appear more than once
582 in the inheritance hierarchy of TYPE, and thus direct conversion
583 between the types may be ambiguous. Following the path back up
584 one step at a time via primary bases avoids the problem. */
585 vfield = TYPE_VFIELD (type);
586 vcontext = DECL_CONTEXT (vfield);
587 while (!same_type_ignoring_top_level_qualifiers_p (vcontext, type))
589 datum = build_simple_base_path (datum, CLASSTYPE_PRIMARY_BINFO (type));
590 type = TREE_TYPE (datum);
593 return build3 (COMPONENT_REF, TREE_TYPE (vfield), datum, vfield, NULL_TREE);
596 /* Given an object INSTANCE, return an expression which yields the
597 vtable element corresponding to INDEX. There are many special
598 cases for INSTANCE which we take care of here, mainly to avoid
599 creating extra tree nodes when we don't have to. */
602 build_vtbl_ref_1 (tree instance, tree idx)
605 tree vtbl = NULL_TREE;
607 /* Try to figure out what a reference refers to, and
608 access its virtual function table directly. */
611 tree fixed_type = fixed_type_or_null (instance, NULL, &cdtorp);
613 tree basetype = non_reference (TREE_TYPE (instance));
615 if (fixed_type && !cdtorp)
617 tree binfo = lookup_base (fixed_type, basetype,
618 ba_unique | ba_quiet, NULL);
620 vtbl = unshare_expr (BINFO_VTABLE (binfo));
624 vtbl = build_vfield_ref (instance, basetype);
626 assemble_external (vtbl);
628 aref = build_array_ref (vtbl, idx);
629 TREE_CONSTANT (aref) |= TREE_CONSTANT (vtbl) && TREE_CONSTANT (idx);
630 TREE_INVARIANT (aref) = TREE_CONSTANT (aref);
636 build_vtbl_ref (tree instance, tree idx)
638 tree aref = build_vtbl_ref_1 (instance, idx);
643 /* Given a stable object pointer INSTANCE_PTR, return an expression which
644 yields a function pointer corresponding to vtable element INDEX. */
647 build_vfn_ref (tree instance_ptr, tree idx)
651 aref = build_vtbl_ref_1 (build_indirect_ref (instance_ptr, 0), idx);
653 /* When using function descriptors, the address of the
654 vtable entry is treated as a function pointer. */
655 if (TARGET_VTABLE_USES_DESCRIPTORS)
656 aref = build1 (NOP_EXPR, TREE_TYPE (aref),
657 build_unary_op (ADDR_EXPR, aref, /*noconvert=*/1));
659 /* Remember this as a method reference, for later devirtualization. */
660 aref = build3 (OBJ_TYPE_REF, TREE_TYPE (aref), aref, instance_ptr, idx);
665 /* Return the name of the virtual function table (as an IDENTIFIER_NODE)
666 for the given TYPE. */
669 get_vtable_name (tree type)
671 return mangle_vtbl_for_type (type);
674 /* DECL is an entity associated with TYPE, like a virtual table or an
675 implicitly generated constructor. Determine whether or not DECL
676 should have external or internal linkage at the object file
677 level. This routine does not deal with COMDAT linkage and other
678 similar complexities; it simply sets TREE_PUBLIC if it possible for
679 entities in other translation units to contain copies of DECL, in
683 set_linkage_according_to_type (tree type, tree decl)
685 /* If TYPE involves a local class in a function with internal
686 linkage, then DECL should have internal linkage too. Other local
687 classes have no linkage -- but if their containing functions
688 have external linkage, it makes sense for DECL to have external
689 linkage too. That will allow template definitions to be merged,
691 if (no_linkage_check (type, /*relaxed_p=*/true))
693 TREE_PUBLIC (decl) = 0;
694 DECL_INTERFACE_KNOWN (decl) = 1;
697 TREE_PUBLIC (decl) = 1;
700 /* Create a VAR_DECL for a primary or secondary vtable for CLASS_TYPE.
701 (For a secondary vtable for B-in-D, CLASS_TYPE should be D, not B.)
702 Use NAME for the name of the vtable, and VTABLE_TYPE for its type. */
705 build_vtable (tree class_type, tree name, tree vtable_type)
709 decl = build_lang_decl (VAR_DECL, name, vtable_type);
710 /* vtable names are already mangled; give them their DECL_ASSEMBLER_NAME
711 now to avoid confusion in mangle_decl. */
712 SET_DECL_ASSEMBLER_NAME (decl, name);
713 DECL_CONTEXT (decl) = class_type;
714 DECL_ARTIFICIAL (decl) = 1;
715 TREE_STATIC (decl) = 1;
716 TREE_READONLY (decl) = 1;
717 DECL_VIRTUAL_P (decl) = 1;
718 DECL_ALIGN (decl) = TARGET_VTABLE_ENTRY_ALIGN;
719 DECL_VTABLE_OR_VTT_P (decl) = 1;
720 /* At one time the vtable info was grabbed 2 words at a time. This
721 fails on sparc unless you have 8-byte alignment. (tiemann) */
722 DECL_ALIGN (decl) = MAX (TYPE_ALIGN (double_type_node),
724 set_linkage_according_to_type (class_type, decl);
725 /* The vtable has not been defined -- yet. */
726 DECL_EXTERNAL (decl) = 1;
727 DECL_NOT_REALLY_EXTERN (decl) = 1;
729 /* Mark the VAR_DECL node representing the vtable itself as a
730 "gratuitous" one, thereby forcing dwarfout.c to ignore it. It
731 is rather important that such things be ignored because any
732 effort to actually generate DWARF for them will run into
733 trouble when/if we encounter code like:
736 struct S { virtual void member (); };
738 because the artificial declaration of the vtable itself (as
739 manufactured by the g++ front end) will say that the vtable is
740 a static member of `S' but only *after* the debug output for
741 the definition of `S' has already been output. This causes
742 grief because the DWARF entry for the definition of the vtable
743 will try to refer back to an earlier *declaration* of the
744 vtable as a static member of `S' and there won't be one. We
745 might be able to arrange to have the "vtable static member"
746 attached to the member list for `S' before the debug info for
747 `S' get written (which would solve the problem) but that would
748 require more intrusive changes to the g++ front end. */
749 DECL_IGNORED_P (decl) = 1;
754 /* Get the VAR_DECL of the vtable for TYPE. TYPE need not be polymorphic,
755 or even complete. If this does not exist, create it. If COMPLETE is
756 nonzero, then complete the definition of it -- that will render it
757 impossible to actually build the vtable, but is useful to get at those
758 which are known to exist in the runtime. */
761 get_vtable_decl (tree type, int complete)
765 if (CLASSTYPE_VTABLES (type))
766 return CLASSTYPE_VTABLES (type);
768 decl = build_vtable (type, get_vtable_name (type), vtbl_type_node);
769 CLASSTYPE_VTABLES (type) = decl;
773 DECL_EXTERNAL (decl) = 1;
774 finish_decl (decl, NULL_TREE, NULL_TREE);
780 /* Build the primary virtual function table for TYPE. If BINFO is
781 non-NULL, build the vtable starting with the initial approximation
782 that it is the same as the one which is the head of the association
783 list. Returns a nonzero value if a new vtable is actually
787 build_primary_vtable (tree binfo, tree type)
792 decl = get_vtable_decl (type, /*complete=*/0);
796 if (BINFO_NEW_VTABLE_MARKED (binfo))
797 /* We have already created a vtable for this base, so there's
798 no need to do it again. */
801 virtuals = copy_list (BINFO_VIRTUALS (binfo));
802 TREE_TYPE (decl) = TREE_TYPE (get_vtbl_decl_for_binfo (binfo));
803 DECL_SIZE (decl) = TYPE_SIZE (TREE_TYPE (decl));
804 DECL_SIZE_UNIT (decl) = TYPE_SIZE_UNIT (TREE_TYPE (decl));
808 gcc_assert (TREE_TYPE (decl) == vtbl_type_node);
809 virtuals = NULL_TREE;
812 #ifdef GATHER_STATISTICS
814 n_vtable_elems += list_length (virtuals);
817 /* Initialize the association list for this type, based
818 on our first approximation. */
819 BINFO_VTABLE (TYPE_BINFO (type)) = decl;
820 BINFO_VIRTUALS (TYPE_BINFO (type)) = virtuals;
821 SET_BINFO_NEW_VTABLE_MARKED (TYPE_BINFO (type));
825 /* Give BINFO a new virtual function table which is initialized
826 with a skeleton-copy of its original initialization. The only
827 entry that changes is the `delta' entry, so we can really
828 share a lot of structure.
830 FOR_TYPE is the most derived type which caused this table to
833 Returns nonzero if we haven't met BINFO before.
835 The order in which vtables are built (by calling this function) for
836 an object must remain the same, otherwise a binary incompatibility
840 build_secondary_vtable (tree binfo)
842 if (BINFO_NEW_VTABLE_MARKED (binfo))
843 /* We already created a vtable for this base. There's no need to
847 /* Remember that we've created a vtable for this BINFO, so that we
848 don't try to do so again. */
849 SET_BINFO_NEW_VTABLE_MARKED (binfo);
851 /* Make fresh virtual list, so we can smash it later. */
852 BINFO_VIRTUALS (binfo) = copy_list (BINFO_VIRTUALS (binfo));
854 /* Secondary vtables are laid out as part of the same structure as
855 the primary vtable. */
856 BINFO_VTABLE (binfo) = NULL_TREE;
860 /* Create a new vtable for BINFO which is the hierarchy dominated by
861 T. Return nonzero if we actually created a new vtable. */
864 make_new_vtable (tree t, tree binfo)
866 if (binfo == TYPE_BINFO (t))
867 /* In this case, it is *type*'s vtable we are modifying. We start
868 with the approximation that its vtable is that of the
869 immediate base class. */
870 return build_primary_vtable (binfo, t);
872 /* This is our very own copy of `basetype' to play with. Later,
873 we will fill in all the virtual functions that override the
874 virtual functions in these base classes which are not defined
875 by the current type. */
876 return build_secondary_vtable (binfo);
879 /* Make *VIRTUALS, an entry on the BINFO_VIRTUALS list for BINFO
880 (which is in the hierarchy dominated by T) list FNDECL as its
881 BV_FN. DELTA is the required constant adjustment from the `this'
882 pointer where the vtable entry appears to the `this' required when
883 the function is actually called. */
886 modify_vtable_entry (tree t,
896 if (fndecl != BV_FN (v)
897 || !tree_int_cst_equal (delta, BV_DELTA (v)))
899 /* We need a new vtable for BINFO. */
900 if (make_new_vtable (t, binfo))
902 /* If we really did make a new vtable, we also made a copy
903 of the BINFO_VIRTUALS list. Now, we have to find the
904 corresponding entry in that list. */
905 *virtuals = BINFO_VIRTUALS (binfo);
906 while (BV_FN (*virtuals) != BV_FN (v))
907 *virtuals = TREE_CHAIN (*virtuals);
911 BV_DELTA (v) = delta;
912 BV_VCALL_INDEX (v) = NULL_TREE;
918 /* Add method METHOD to class TYPE. If USING_DECL is non-null, it is
919 the USING_DECL naming METHOD. Returns true if the method could be
920 added to the method vec. */
923 add_method (tree type, tree method, tree using_decl)
927 bool template_conv_p = false;
929 VEC(tree,gc) *method_vec;
931 bool insert_p = false;
935 if (method == error_mark_node)
938 complete_p = COMPLETE_TYPE_P (type);
939 conv_p = DECL_CONV_FN_P (method);
941 template_conv_p = (TREE_CODE (method) == TEMPLATE_DECL
942 && DECL_TEMPLATE_CONV_FN_P (method));
944 method_vec = CLASSTYPE_METHOD_VEC (type);
947 /* Make a new method vector. We start with 8 entries. We must
948 allocate at least two (for constructors and destructors), and
949 we're going to end up with an assignment operator at some
951 method_vec = VEC_alloc (tree, gc, 8);
952 /* Create slots for constructors and destructors. */
953 VEC_quick_push (tree, method_vec, NULL_TREE);
954 VEC_quick_push (tree, method_vec, NULL_TREE);
955 CLASSTYPE_METHOD_VEC (type) = method_vec;
958 /* Maintain TYPE_HAS_USER_CONSTRUCTOR, etc. */
959 grok_special_member_properties (method);
961 /* Constructors and destructors go in special slots. */
962 if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (method))
963 slot = CLASSTYPE_CONSTRUCTOR_SLOT;
964 else if (DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P (method))
966 slot = CLASSTYPE_DESTRUCTOR_SLOT;
968 if (TYPE_FOR_JAVA (type))
970 if (!DECL_ARTIFICIAL (method))
971 error ("Java class %qT cannot have a destructor", type);
972 else if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type))
973 error ("Java class %qT cannot have an implicit non-trivial "
983 /* See if we already have an entry with this name. */
984 for (slot = CLASSTYPE_FIRST_CONVERSION_SLOT;
985 VEC_iterate (tree, method_vec, slot, m);
991 if (TREE_CODE (m) == TEMPLATE_DECL
992 && DECL_TEMPLATE_CONV_FN_P (m))
996 if (conv_p && !DECL_CONV_FN_P (m))
998 if (DECL_NAME (m) == DECL_NAME (method))
1004 && !DECL_CONV_FN_P (m)
1005 && DECL_NAME (m) > DECL_NAME (method))
1009 current_fns = insert_p ? NULL_TREE : VEC_index (tree, method_vec, slot);
1011 /* Check to see if we've already got this method. */
1012 for (fns = current_fns; fns; fns = OVL_NEXT (fns))
1014 tree fn = OVL_CURRENT (fns);
1020 if (TREE_CODE (fn) != TREE_CODE (method))
1023 /* [over.load] Member function declarations with the
1024 same name and the same parameter types cannot be
1025 overloaded if any of them is a static member
1026 function declaration.
1028 [namespace.udecl] When a using-declaration brings names
1029 from a base class into a derived class scope, member
1030 functions in the derived class override and/or hide member
1031 functions with the same name and parameter types in a base
1032 class (rather than conflicting). */
1033 fn_type = TREE_TYPE (fn);
1034 method_type = TREE_TYPE (method);
1035 parms1 = TYPE_ARG_TYPES (fn_type);
1036 parms2 = TYPE_ARG_TYPES (method_type);
1038 /* Compare the quals on the 'this' parm. Don't compare
1039 the whole types, as used functions are treated as
1040 coming from the using class in overload resolution. */
1041 if (! DECL_STATIC_FUNCTION_P (fn)
1042 && ! DECL_STATIC_FUNCTION_P (method)
1043 && TREE_TYPE (TREE_VALUE (parms1)) != error_mark_node
1044 && TREE_TYPE (TREE_VALUE (parms2)) != error_mark_node
1045 && (TYPE_QUALS (TREE_TYPE (TREE_VALUE (parms1)))
1046 != TYPE_QUALS (TREE_TYPE (TREE_VALUE (parms2)))))
1049 /* For templates, the return type and template parameters
1050 must be identical. */
1051 if (TREE_CODE (fn) == TEMPLATE_DECL
1052 && (!same_type_p (TREE_TYPE (fn_type),
1053 TREE_TYPE (method_type))
1054 || !comp_template_parms (DECL_TEMPLATE_PARMS (fn),
1055 DECL_TEMPLATE_PARMS (method))))
1058 if (! DECL_STATIC_FUNCTION_P (fn))
1059 parms1 = TREE_CHAIN (parms1);
1060 if (! DECL_STATIC_FUNCTION_P (method))
1061 parms2 = TREE_CHAIN (parms2);
1063 if (compparms (parms1, parms2)
1064 && (!DECL_CONV_FN_P (fn)
1065 || same_type_p (TREE_TYPE (fn_type),
1066 TREE_TYPE (method_type))))
1070 if (DECL_CONTEXT (fn) == type)
1071 /* Defer to the local function. */
1073 if (DECL_CONTEXT (fn) == DECL_CONTEXT (method))
1074 error ("repeated using declaration %q+D", using_decl);
1076 error ("using declaration %q+D conflicts with a previous using declaration",
1081 error ("%q+#D cannot be overloaded", method);
1082 error ("with %q+#D", fn);
1085 /* We don't call duplicate_decls here to merge the
1086 declarations because that will confuse things if the
1087 methods have inline definitions. In particular, we
1088 will crash while processing the definitions. */
1093 /* A class should never have more than one destructor. */
1094 if (current_fns && DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P (method))
1097 /* Add the new binding. */
1098 overload = build_overload (method, current_fns);
1101 TYPE_HAS_CONVERSION (type) = 1;
1102 else if (slot >= CLASSTYPE_FIRST_CONVERSION_SLOT && !complete_p)
1103 push_class_level_binding (DECL_NAME (method), overload);
1109 /* We only expect to add few methods in the COMPLETE_P case, so
1110 just make room for one more method in that case. */
1112 reallocated = VEC_reserve_exact (tree, gc, method_vec, 1);
1114 reallocated = VEC_reserve (tree, gc, method_vec, 1);
1116 CLASSTYPE_METHOD_VEC (type) = method_vec;
1117 if (slot == VEC_length (tree, method_vec))
1118 VEC_quick_push (tree, method_vec, overload);
1120 VEC_quick_insert (tree, method_vec, slot, overload);
1123 /* Replace the current slot. */
1124 VEC_replace (tree, method_vec, slot, overload);
1128 /* Subroutines of finish_struct. */
1130 /* Change the access of FDECL to ACCESS in T. Return 1 if change was
1131 legit, otherwise return 0. */
1134 alter_access (tree t, tree fdecl, tree access)
1138 if (!DECL_LANG_SPECIFIC (fdecl))
1139 retrofit_lang_decl (fdecl);
1141 gcc_assert (!DECL_DISCRIMINATOR_P (fdecl));
1143 elem = purpose_member (t, DECL_ACCESS (fdecl));
1146 if (TREE_VALUE (elem) != access)
1148 if (TREE_CODE (TREE_TYPE (fdecl)) == FUNCTION_DECL)
1149 error ("conflicting access specifications for method"
1150 " %q+D, ignored", TREE_TYPE (fdecl));
1152 error ("conflicting access specifications for field %qE, ignored",
1157 /* They're changing the access to the same thing they changed
1158 it to before. That's OK. */
1164 perform_or_defer_access_check (TYPE_BINFO (t), fdecl, fdecl);
1165 DECL_ACCESS (fdecl) = tree_cons (t, access, DECL_ACCESS (fdecl));
1171 /* Process the USING_DECL, which is a member of T. */
1174 handle_using_decl (tree using_decl, tree t)
1176 tree decl = USING_DECL_DECLS (using_decl);
1177 tree name = DECL_NAME (using_decl);
1179 = TREE_PRIVATE (using_decl) ? access_private_node
1180 : TREE_PROTECTED (using_decl) ? access_protected_node
1181 : access_public_node;
1182 tree flist = NULL_TREE;
1185 gcc_assert (!processing_template_decl && decl);
1187 old_value = lookup_member (t, name, /*protect=*/0, /*want_type=*/false);
1190 if (is_overloaded_fn (old_value))
1191 old_value = OVL_CURRENT (old_value);
1193 if (DECL_P (old_value) && DECL_CONTEXT (old_value) == t)
1196 old_value = NULL_TREE;
1199 cp_emit_debug_info_for_using (decl, USING_DECL_SCOPE (using_decl));
1201 if (is_overloaded_fn (decl))
1206 else if (is_overloaded_fn (old_value))
1209 /* It's OK to use functions from a base when there are functions with
1210 the same name already present in the current class. */;
1213 error ("%q+D invalid in %q#T", using_decl, t);
1214 error (" because of local method %q+#D with same name",
1215 OVL_CURRENT (old_value));
1219 else if (!DECL_ARTIFICIAL (old_value))
1221 error ("%q+D invalid in %q#T", using_decl, t);
1222 error (" because of local member %q+#D with same name", old_value);
1226 /* Make type T see field decl FDECL with access ACCESS. */
1228 for (; flist; flist = OVL_NEXT (flist))
1230 add_method (t, OVL_CURRENT (flist), using_decl);
1231 alter_access (t, OVL_CURRENT (flist), access);
1234 alter_access (t, decl, access);
1237 /* Run through the base classes of T, updating CANT_HAVE_CONST_CTOR_P,
1238 and NO_CONST_ASN_REF_P. Also set flag bits in T based on
1239 properties of the bases. */
1242 check_bases (tree t,
1243 int* cant_have_const_ctor_p,
1244 int* no_const_asn_ref_p)
1247 int seen_non_virtual_nearly_empty_base_p;
1251 seen_non_virtual_nearly_empty_base_p = 0;
1253 for (binfo = TYPE_BINFO (t), i = 0;
1254 BINFO_BASE_ITERATE (binfo, i, base_binfo); i++)
1256 tree basetype = TREE_TYPE (base_binfo);
1258 gcc_assert (COMPLETE_TYPE_P (basetype));
1260 /* Effective C++ rule 14. We only need to check TYPE_POLYMORPHIC_P
1261 here because the case of virtual functions but non-virtual
1262 dtor is handled in finish_struct_1. */
1263 if (!TYPE_POLYMORPHIC_P (basetype))
1264 warning (OPT_Weffc__,
1265 "base class %q#T has a non-virtual destructor", basetype);
1267 /* If the base class doesn't have copy constructors or
1268 assignment operators that take const references, then the
1269 derived class cannot have such a member automatically
1271 if (! TYPE_HAS_CONST_INIT_REF (basetype))
1272 *cant_have_const_ctor_p = 1;
1273 if (TYPE_HAS_ASSIGN_REF (basetype)
1274 && !TYPE_HAS_CONST_ASSIGN_REF (basetype))
1275 *no_const_asn_ref_p = 1;
1277 if (BINFO_VIRTUAL_P (base_binfo))
1278 /* A virtual base does not effect nearly emptiness. */
1280 else if (CLASSTYPE_NEARLY_EMPTY_P (basetype))
1282 if (seen_non_virtual_nearly_empty_base_p)
1283 /* And if there is more than one nearly empty base, then the
1284 derived class is not nearly empty either. */
1285 CLASSTYPE_NEARLY_EMPTY_P (t) = 0;
1287 /* Remember we've seen one. */
1288 seen_non_virtual_nearly_empty_base_p = 1;
1290 else if (!is_empty_class (basetype))
1291 /* If the base class is not empty or nearly empty, then this
1292 class cannot be nearly empty. */
1293 CLASSTYPE_NEARLY_EMPTY_P (t) = 0;
1295 /* A lot of properties from the bases also apply to the derived
1297 TYPE_NEEDS_CONSTRUCTING (t) |= TYPE_NEEDS_CONSTRUCTING (basetype);
1298 TYPE_HAS_NONTRIVIAL_DESTRUCTOR (t)
1299 |= TYPE_HAS_NONTRIVIAL_DESTRUCTOR (basetype);
1300 TYPE_HAS_COMPLEX_ASSIGN_REF (t)
1301 |= TYPE_HAS_COMPLEX_ASSIGN_REF (basetype);
1302 TYPE_HAS_COMPLEX_INIT_REF (t) |= TYPE_HAS_COMPLEX_INIT_REF (basetype);
1303 TYPE_POLYMORPHIC_P (t) |= TYPE_POLYMORPHIC_P (basetype);
1304 CLASSTYPE_CONTAINS_EMPTY_CLASS_P (t)
1305 |= CLASSTYPE_CONTAINS_EMPTY_CLASS_P (basetype);
1306 TYPE_HAS_COMPLEX_DFLT (t) |= TYPE_HAS_COMPLEX_DFLT (basetype);
1310 /* Determine all the primary bases within T. Sets BINFO_PRIMARY_BASE_P for
1311 those that are primaries. Sets BINFO_LOST_PRIMARY_P for those
1312 that have had a nearly-empty virtual primary base stolen by some
1313 other base in the hierarchy. Determines CLASSTYPE_PRIMARY_BASE for
1317 determine_primary_bases (tree t)
1320 tree primary = NULL_TREE;
1321 tree type_binfo = TYPE_BINFO (t);
1324 /* Determine the primary bases of our bases. */
1325 for (base_binfo = TREE_CHAIN (type_binfo); base_binfo;
1326 base_binfo = TREE_CHAIN (base_binfo))
1328 tree primary = CLASSTYPE_PRIMARY_BINFO (BINFO_TYPE (base_binfo));
1330 /* See if we're the non-virtual primary of our inheritance
1332 if (!BINFO_VIRTUAL_P (base_binfo))
1334 tree parent = BINFO_INHERITANCE_CHAIN (base_binfo);
1335 tree parent_primary = CLASSTYPE_PRIMARY_BINFO (BINFO_TYPE (parent));
1338 && SAME_BINFO_TYPE_P (BINFO_TYPE (base_binfo),
1339 BINFO_TYPE (parent_primary)))
1340 /* We are the primary binfo. */
1341 BINFO_PRIMARY_P (base_binfo) = 1;
1343 /* Determine if we have a virtual primary base, and mark it so.
1345 if (primary && BINFO_VIRTUAL_P (primary))
1347 tree this_primary = copied_binfo (primary, base_binfo);
1349 if (BINFO_PRIMARY_P (this_primary))
1350 /* Someone already claimed this base. */
1351 BINFO_LOST_PRIMARY_P (base_binfo) = 1;
1356 BINFO_PRIMARY_P (this_primary) = 1;
1357 BINFO_INHERITANCE_CHAIN (this_primary) = base_binfo;
1359 /* A virtual binfo might have been copied from within
1360 another hierarchy. As we're about to use it as a
1361 primary base, make sure the offsets match. */
1362 delta = size_diffop (convert (ssizetype,
1363 BINFO_OFFSET (base_binfo)),
1365 BINFO_OFFSET (this_primary)));
1367 propagate_binfo_offsets (this_primary, delta);
1372 /* First look for a dynamic direct non-virtual base. */
1373 for (i = 0; BINFO_BASE_ITERATE (type_binfo, i, base_binfo); i++)
1375 tree basetype = BINFO_TYPE (base_binfo);
1377 if (TYPE_CONTAINS_VPTR_P (basetype) && !BINFO_VIRTUAL_P (base_binfo))
1379 primary = base_binfo;
1384 /* A "nearly-empty" virtual base class can be the primary base
1385 class, if no non-virtual polymorphic base can be found. Look for
1386 a nearly-empty virtual dynamic base that is not already a primary
1387 base of something in the hierarchy. If there is no such base,
1388 just pick the first nearly-empty virtual base. */
1390 for (base_binfo = TREE_CHAIN (type_binfo); base_binfo;
1391 base_binfo = TREE_CHAIN (base_binfo))
1392 if (BINFO_VIRTUAL_P (base_binfo)
1393 && CLASSTYPE_NEARLY_EMPTY_P (BINFO_TYPE (base_binfo)))
1395 if (!BINFO_PRIMARY_P (base_binfo))
1397 /* Found one that is not primary. */
1398 primary = base_binfo;
1402 /* Remember the first candidate. */
1403 primary = base_binfo;
1407 /* If we've got a primary base, use it. */
1410 tree basetype = BINFO_TYPE (primary);
1412 CLASSTYPE_PRIMARY_BINFO (t) = primary;
1413 if (BINFO_PRIMARY_P (primary))
1414 /* We are stealing a primary base. */
1415 BINFO_LOST_PRIMARY_P (BINFO_INHERITANCE_CHAIN (primary)) = 1;
1416 BINFO_PRIMARY_P (primary) = 1;
1417 if (BINFO_VIRTUAL_P (primary))
1421 BINFO_INHERITANCE_CHAIN (primary) = type_binfo;
1422 /* A virtual binfo might have been copied from within
1423 another hierarchy. As we're about to use it as a primary
1424 base, make sure the offsets match. */
1425 delta = size_diffop (ssize_int (0),
1426 convert (ssizetype, BINFO_OFFSET (primary)));
1428 propagate_binfo_offsets (primary, delta);
1431 primary = TYPE_BINFO (basetype);
1433 TYPE_VFIELD (t) = TYPE_VFIELD (basetype);
1434 BINFO_VTABLE (type_binfo) = BINFO_VTABLE (primary);
1435 BINFO_VIRTUALS (type_binfo) = BINFO_VIRTUALS (primary);
1439 /* Set memoizing fields and bits of T (and its variants) for later
1443 finish_struct_bits (tree t)
1447 /* Fix up variants (if any). */
1448 for (variants = TYPE_NEXT_VARIANT (t);
1450 variants = TYPE_NEXT_VARIANT (variants))
1452 /* These fields are in the _TYPE part of the node, not in
1453 the TYPE_LANG_SPECIFIC component, so they are not shared. */
1454 TYPE_HAS_USER_CONSTRUCTOR (variants) = TYPE_HAS_USER_CONSTRUCTOR (t);
1455 TYPE_NEEDS_CONSTRUCTING (variants) = TYPE_NEEDS_CONSTRUCTING (t);
1456 TYPE_HAS_NONTRIVIAL_DESTRUCTOR (variants)
1457 = TYPE_HAS_NONTRIVIAL_DESTRUCTOR (t);
1459 TYPE_POLYMORPHIC_P (variants) = TYPE_POLYMORPHIC_P (t);
1461 TYPE_BINFO (variants) = TYPE_BINFO (t);
1463 /* Copy whatever these are holding today. */
1464 TYPE_VFIELD (variants) = TYPE_VFIELD (t);
1465 TYPE_METHODS (variants) = TYPE_METHODS (t);
1466 TYPE_FIELDS (variants) = TYPE_FIELDS (t);
1468 /* All variants of a class have the same attributes. */
1469 TYPE_ATTRIBUTES (variants) = TYPE_ATTRIBUTES (t);
1472 if (BINFO_N_BASE_BINFOS (TYPE_BINFO (t)) && TYPE_POLYMORPHIC_P (t))
1473 /* For a class w/o baseclasses, 'finish_struct' has set
1474 CLASSTYPE_PURE_VIRTUALS correctly (by definition).
1475 Similarly for a class whose base classes do not have vtables.
1476 When neither of these is true, we might have removed abstract
1477 virtuals (by providing a definition), added some (by declaring
1478 new ones), or redeclared ones from a base class. We need to
1479 recalculate what's really an abstract virtual at this point (by
1480 looking in the vtables). */
1481 get_pure_virtuals (t);
1483 /* If this type has a copy constructor or a destructor, force its
1484 mode to be BLKmode, and force its TREE_ADDRESSABLE bit to be
1485 nonzero. This will cause it to be passed by invisible reference
1486 and prevent it from being returned in a register. */
1487 if (! TYPE_HAS_TRIVIAL_INIT_REF (t) || TYPE_HAS_NONTRIVIAL_DESTRUCTOR (t))
1490 DECL_MODE (TYPE_MAIN_DECL (t)) = BLKmode;
1491 for (variants = t; variants; variants = TYPE_NEXT_VARIANT (variants))
1493 TYPE_MODE (variants) = BLKmode;
1494 TREE_ADDRESSABLE (variants) = 1;
1499 /* Issue warnings about T having private constructors, but no friends,
1502 HAS_NONPRIVATE_METHOD is nonzero if T has any non-private methods or
1503 static members. HAS_NONPRIVATE_STATIC_FN is nonzero if T has any
1504 non-private static member functions. */
1507 maybe_warn_about_overly_private_class (tree t)
1509 int has_member_fn = 0;
1510 int has_nonprivate_method = 0;
1513 if (!warn_ctor_dtor_privacy
1514 /* If the class has friends, those entities might create and
1515 access instances, so we should not warn. */
1516 || (CLASSTYPE_FRIEND_CLASSES (t)
1517 || DECL_FRIENDLIST (TYPE_MAIN_DECL (t)))
1518 /* We will have warned when the template was declared; there's
1519 no need to warn on every instantiation. */
1520 || CLASSTYPE_TEMPLATE_INSTANTIATION (t))
1521 /* There's no reason to even consider warning about this
1525 /* We only issue one warning, if more than one applies, because
1526 otherwise, on code like:
1529 // Oops - forgot `public:'
1535 we warn several times about essentially the same problem. */
1537 /* Check to see if all (non-constructor, non-destructor) member
1538 functions are private. (Since there are no friends or
1539 non-private statics, we can't ever call any of the private member
1541 for (fn = TYPE_METHODS (t); fn; fn = TREE_CHAIN (fn))
1542 /* We're not interested in compiler-generated methods; they don't
1543 provide any way to call private members. */
1544 if (!DECL_ARTIFICIAL (fn))
1546 if (!TREE_PRIVATE (fn))
1548 if (DECL_STATIC_FUNCTION_P (fn))
1549 /* A non-private static member function is just like a
1550 friend; it can create and invoke private member
1551 functions, and be accessed without a class
1555 has_nonprivate_method = 1;
1556 /* Keep searching for a static member function. */
1558 else if (!DECL_CONSTRUCTOR_P (fn) && !DECL_DESTRUCTOR_P (fn))
1562 if (!has_nonprivate_method && has_member_fn)
1564 /* There are no non-private methods, and there's at least one
1565 private member function that isn't a constructor or
1566 destructor. (If all the private members are
1567 constructors/destructors we want to use the code below that
1568 issues error messages specifically referring to
1569 constructors/destructors.) */
1571 tree binfo = TYPE_BINFO (t);
1573 for (i = 0; i != BINFO_N_BASE_BINFOS (binfo); i++)
1574 if (BINFO_BASE_ACCESS (binfo, i) != access_private_node)
1576 has_nonprivate_method = 1;
1579 if (!has_nonprivate_method)
1581 warning (OPT_Wctor_dtor_privacy,
1582 "all member functions in class %qT are private", t);
1587 /* Even if some of the member functions are non-private, the class
1588 won't be useful for much if all the constructors or destructors
1589 are private: such an object can never be created or destroyed. */
1590 fn = CLASSTYPE_DESTRUCTORS (t);
1591 if (fn && TREE_PRIVATE (fn))
1593 warning (OPT_Wctor_dtor_privacy,
1594 "%q#T only defines a private destructor and has no friends",
1599 /* Warn about classes that have private constructors and no friends. */
1600 if (TYPE_HAS_USER_CONSTRUCTOR (t)
1601 /* Implicitly generated constructors are always public. */
1602 && (!CLASSTYPE_LAZY_DEFAULT_CTOR (t)
1603 || !CLASSTYPE_LAZY_COPY_CTOR (t)))
1605 int nonprivate_ctor = 0;
1607 /* If a non-template class does not define a copy
1608 constructor, one is defined for it, enabling it to avoid
1609 this warning. For a template class, this does not
1610 happen, and so we would normally get a warning on:
1612 template <class T> class C { private: C(); };
1614 To avoid this asymmetry, we check TYPE_HAS_INIT_REF. All
1615 complete non-template or fully instantiated classes have this
1617 if (!TYPE_HAS_INIT_REF (t))
1618 nonprivate_ctor = 1;
1620 for (fn = CLASSTYPE_CONSTRUCTORS (t); fn; fn = OVL_NEXT (fn))
1622 tree ctor = OVL_CURRENT (fn);
1623 /* Ideally, we wouldn't count copy constructors (or, in
1624 fact, any constructor that takes an argument of the
1625 class type as a parameter) because such things cannot
1626 be used to construct an instance of the class unless
1627 you already have one. But, for now at least, we're
1629 if (! TREE_PRIVATE (ctor))
1631 nonprivate_ctor = 1;
1636 if (nonprivate_ctor == 0)
1638 warning (OPT_Wctor_dtor_privacy,
1639 "%q#T only defines private constructors and has no friends",
1647 gt_pointer_operator new_value;
1651 /* Comparison function to compare two TYPE_METHOD_VEC entries by name. */
1654 method_name_cmp (const void* m1_p, const void* m2_p)
1656 const tree *const m1 = (const tree *) m1_p;
1657 const tree *const m2 = (const tree *) m2_p;
1659 if (*m1 == NULL_TREE && *m2 == NULL_TREE)
1661 if (*m1 == NULL_TREE)
1663 if (*m2 == NULL_TREE)
1665 if (DECL_NAME (OVL_CURRENT (*m1)) < DECL_NAME (OVL_CURRENT (*m2)))
1670 /* This routine compares two fields like method_name_cmp but using the
1671 pointer operator in resort_field_decl_data. */
1674 resort_method_name_cmp (const void* m1_p, const void* m2_p)
1676 const tree *const m1 = (const tree *) m1_p;
1677 const tree *const m2 = (const tree *) m2_p;
1678 if (*m1 == NULL_TREE && *m2 == NULL_TREE)
1680 if (*m1 == NULL_TREE)
1682 if (*m2 == NULL_TREE)
1685 tree d1 = DECL_NAME (OVL_CURRENT (*m1));
1686 tree d2 = DECL_NAME (OVL_CURRENT (*m2));
1687 resort_data.new_value (&d1, resort_data.cookie);
1688 resort_data.new_value (&d2, resort_data.cookie);
1695 /* Resort TYPE_METHOD_VEC because pointers have been reordered. */
1698 resort_type_method_vec (void* obj,
1699 void* orig_obj ATTRIBUTE_UNUSED ,
1700 gt_pointer_operator new_value,
1703 VEC(tree,gc) *method_vec = (VEC(tree,gc) *) obj;
1704 int len = VEC_length (tree, method_vec);
1708 /* The type conversion ops have to live at the front of the vec, so we
1710 for (slot = CLASSTYPE_FIRST_CONVERSION_SLOT;
1711 VEC_iterate (tree, method_vec, slot, fn);
1713 if (!DECL_CONV_FN_P (OVL_CURRENT (fn)))
1718 resort_data.new_value = new_value;
1719 resort_data.cookie = cookie;
1720 qsort (VEC_address (tree, method_vec) + slot, len - slot, sizeof (tree),
1721 resort_method_name_cmp);
1725 /* Warn about duplicate methods in fn_fields.
1727 Sort methods that are not special (i.e., constructors, destructors,
1728 and type conversion operators) so that we can find them faster in
1732 finish_struct_methods (tree t)
1735 VEC(tree,gc) *method_vec;
1738 method_vec = CLASSTYPE_METHOD_VEC (t);
1742 len = VEC_length (tree, method_vec);
1744 /* Clear DECL_IN_AGGR_P for all functions. */
1745 for (fn_fields = TYPE_METHODS (t); fn_fields;
1746 fn_fields = TREE_CHAIN (fn_fields))
1747 DECL_IN_AGGR_P (fn_fields) = 0;
1749 /* Issue warnings about private constructors and such. If there are
1750 no methods, then some public defaults are generated. */
1751 maybe_warn_about_overly_private_class (t);
1753 /* The type conversion ops have to live at the front of the vec, so we
1755 for (slot = CLASSTYPE_FIRST_CONVERSION_SLOT;
1756 VEC_iterate (tree, method_vec, slot, fn_fields);
1758 if (!DECL_CONV_FN_P (OVL_CURRENT (fn_fields)))
1761 qsort (VEC_address (tree, method_vec) + slot,
1762 len-slot, sizeof (tree), method_name_cmp);
1765 /* Make BINFO's vtable have N entries, including RTTI entries,
1766 vbase and vcall offsets, etc. Set its type and call the back end
1770 layout_vtable_decl (tree binfo, int n)
1775 atype = build_cplus_array_type (vtable_entry_type,
1776 build_index_type (size_int (n - 1)));
1777 layout_type (atype);
1779 /* We may have to grow the vtable. */
1780 vtable = get_vtbl_decl_for_binfo (binfo);
1781 if (!same_type_p (TREE_TYPE (vtable), atype))
1783 TREE_TYPE (vtable) = atype;
1784 DECL_SIZE (vtable) = DECL_SIZE_UNIT (vtable) = NULL_TREE;
1785 layout_decl (vtable, 0);
1789 /* True iff FNDECL and BASE_FNDECL (both non-static member functions)
1790 have the same signature. */
1793 same_signature_p (const_tree fndecl, const_tree base_fndecl)
1795 /* One destructor overrides another if they are the same kind of
1797 if (DECL_DESTRUCTOR_P (base_fndecl) && DECL_DESTRUCTOR_P (fndecl)
1798 && special_function_p (base_fndecl) == special_function_p (fndecl))
1800 /* But a non-destructor never overrides a destructor, nor vice
1801 versa, nor do different kinds of destructors override
1802 one-another. For example, a complete object destructor does not
1803 override a deleting destructor. */
1804 if (DECL_DESTRUCTOR_P (base_fndecl) || DECL_DESTRUCTOR_P (fndecl))
1807 if (DECL_NAME (fndecl) == DECL_NAME (base_fndecl)
1808 || (DECL_CONV_FN_P (fndecl)
1809 && DECL_CONV_FN_P (base_fndecl)
1810 && same_type_p (DECL_CONV_FN_TYPE (fndecl),
1811 DECL_CONV_FN_TYPE (base_fndecl))))
1813 tree types, base_types;
1814 types = TYPE_ARG_TYPES (TREE_TYPE (fndecl));
1815 base_types = TYPE_ARG_TYPES (TREE_TYPE (base_fndecl));
1816 if ((TYPE_QUALS (TREE_TYPE (TREE_VALUE (base_types)))
1817 == TYPE_QUALS (TREE_TYPE (TREE_VALUE (types))))
1818 && compparms (TREE_CHAIN (base_types), TREE_CHAIN (types)))
1824 /* Returns TRUE if DERIVED is a binfo containing the binfo BASE as a
1828 base_derived_from (tree derived, tree base)
1832 for (probe = base; probe; probe = BINFO_INHERITANCE_CHAIN (probe))
1834 if (probe == derived)
1836 else if (BINFO_VIRTUAL_P (probe))
1837 /* If we meet a virtual base, we can't follow the inheritance
1838 any more. See if the complete type of DERIVED contains
1839 such a virtual base. */
1840 return (binfo_for_vbase (BINFO_TYPE (probe), BINFO_TYPE (derived))
1846 typedef struct find_final_overrider_data_s {
1847 /* The function for which we are trying to find a final overrider. */
1849 /* The base class in which the function was declared. */
1850 tree declaring_base;
1851 /* The candidate overriders. */
1853 /* Path to most derived. */
1854 VEC(tree,heap) *path;
1855 } find_final_overrider_data;
1857 /* Add the overrider along the current path to FFOD->CANDIDATES.
1858 Returns true if an overrider was found; false otherwise. */
1861 dfs_find_final_overrider_1 (tree binfo,
1862 find_final_overrider_data *ffod,
1867 /* If BINFO is not the most derived type, try a more derived class.
1868 A definition there will overrider a definition here. */
1872 if (dfs_find_final_overrider_1
1873 (VEC_index (tree, ffod->path, depth), ffod, depth))
1877 method = look_for_overrides_here (BINFO_TYPE (binfo), ffod->fn);
1880 tree *candidate = &ffod->candidates;
1882 /* Remove any candidates overridden by this new function. */
1885 /* If *CANDIDATE overrides METHOD, then METHOD
1886 cannot override anything else on the list. */
1887 if (base_derived_from (TREE_VALUE (*candidate), binfo))
1889 /* If METHOD overrides *CANDIDATE, remove *CANDIDATE. */
1890 if (base_derived_from (binfo, TREE_VALUE (*candidate)))
1891 *candidate = TREE_CHAIN (*candidate);
1893 candidate = &TREE_CHAIN (*candidate);
1896 /* Add the new function. */
1897 ffod->candidates = tree_cons (method, binfo, ffod->candidates);
1904 /* Called from find_final_overrider via dfs_walk. */
1907 dfs_find_final_overrider_pre (tree binfo, void *data)
1909 find_final_overrider_data *ffod = (find_final_overrider_data *) data;
1911 if (binfo == ffod->declaring_base)
1912 dfs_find_final_overrider_1 (binfo, ffod, VEC_length (tree, ffod->path));
1913 VEC_safe_push (tree, heap, ffod->path, binfo);
1919 dfs_find_final_overrider_post (tree binfo ATTRIBUTE_UNUSED, void *data)
1921 find_final_overrider_data *ffod = (find_final_overrider_data *) data;
1922 VEC_pop (tree, ffod->path);
1927 /* Returns a TREE_LIST whose TREE_PURPOSE is the final overrider for
1928 FN and whose TREE_VALUE is the binfo for the base where the
1929 overriding occurs. BINFO (in the hierarchy dominated by the binfo
1930 DERIVED) is the base object in which FN is declared. */
1933 find_final_overrider (tree derived, tree binfo, tree fn)
1935 find_final_overrider_data ffod;
1937 /* Getting this right is a little tricky. This is valid:
1939 struct S { virtual void f (); };
1940 struct T { virtual void f (); };
1941 struct U : public S, public T { };
1943 even though calling `f' in `U' is ambiguous. But,
1945 struct R { virtual void f(); };
1946 struct S : virtual public R { virtual void f (); };
1947 struct T : virtual public R { virtual void f (); };
1948 struct U : public S, public T { };
1950 is not -- there's no way to decide whether to put `S::f' or
1951 `T::f' in the vtable for `R'.
1953 The solution is to look at all paths to BINFO. If we find
1954 different overriders along any two, then there is a problem. */
1955 if (DECL_THUNK_P (fn))
1956 fn = THUNK_TARGET (fn);
1958 /* Determine the depth of the hierarchy. */
1960 ffod.declaring_base = binfo;
1961 ffod.candidates = NULL_TREE;
1962 ffod.path = VEC_alloc (tree, heap, 30);
1964 dfs_walk_all (derived, dfs_find_final_overrider_pre,
1965 dfs_find_final_overrider_post, &ffod);
1967 VEC_free (tree, heap, ffod.path);
1969 /* If there was no winner, issue an error message. */
1970 if (!ffod.candidates || TREE_CHAIN (ffod.candidates))
1971 return error_mark_node;
1973 return ffod.candidates;
1976 /* Return the index of the vcall offset for FN when TYPE is used as a
1980 get_vcall_index (tree fn, tree type)
1982 VEC(tree_pair_s,gc) *indices = CLASSTYPE_VCALL_INDICES (type);
1986 for (ix = 0; VEC_iterate (tree_pair_s, indices, ix, p); ix++)
1987 if ((DECL_DESTRUCTOR_P (fn) && DECL_DESTRUCTOR_P (p->purpose))
1988 || same_signature_p (fn, p->purpose))
1991 /* There should always be an appropriate index. */
1995 /* Update an entry in the vtable for BINFO, which is in the hierarchy
1996 dominated by T. FN has been overridden in BINFO; VIRTUALS points to the
1997 corresponding position in the BINFO_VIRTUALS list. */
2000 update_vtable_entry_for_fn (tree t, tree binfo, tree fn, tree* virtuals,
2008 tree overrider_fn, overrider_target;
2009 tree target_fn = DECL_THUNK_P (fn) ? THUNK_TARGET (fn) : fn;
2010 tree over_return, base_return;
2013 /* Find the nearest primary base (possibly binfo itself) which defines
2014 this function; this is the class the caller will convert to when
2015 calling FN through BINFO. */
2016 for (b = binfo; ; b = get_primary_binfo (b))
2019 if (look_for_overrides_here (BINFO_TYPE (b), target_fn))
2022 /* The nearest definition is from a lost primary. */
2023 if (BINFO_LOST_PRIMARY_P (b))
2028 /* Find the final overrider. */
2029 overrider = find_final_overrider (TYPE_BINFO (t), b, target_fn);
2030 if (overrider == error_mark_node)
2032 error ("no unique final overrider for %qD in %qT", target_fn, t);
2035 overrider_target = overrider_fn = TREE_PURPOSE (overrider);
2037 /* Check for adjusting covariant return types. */
2038 over_return = TREE_TYPE (TREE_TYPE (overrider_target));
2039 base_return = TREE_TYPE (TREE_TYPE (target_fn));
2041 if (POINTER_TYPE_P (over_return)
2042 && TREE_CODE (over_return) == TREE_CODE (base_return)
2043 && CLASS_TYPE_P (TREE_TYPE (over_return))
2044 && CLASS_TYPE_P (TREE_TYPE (base_return))
2045 /* If the overrider is invalid, don't even try. */
2046 && !DECL_INVALID_OVERRIDER_P (overrider_target))
2048 /* If FN is a covariant thunk, we must figure out the adjustment
2049 to the final base FN was converting to. As OVERRIDER_TARGET might
2050 also be converting to the return type of FN, we have to
2051 combine the two conversions here. */
2052 tree fixed_offset, virtual_offset;
2054 over_return = TREE_TYPE (over_return);
2055 base_return = TREE_TYPE (base_return);
2057 if (DECL_THUNK_P (fn))
2059 gcc_assert (DECL_RESULT_THUNK_P (fn));
2060 fixed_offset = ssize_int (THUNK_FIXED_OFFSET (fn));
2061 virtual_offset = THUNK_VIRTUAL_OFFSET (fn);
2064 fixed_offset = virtual_offset = NULL_TREE;
2067 /* Find the equivalent binfo within the return type of the
2068 overriding function. We will want the vbase offset from
2070 virtual_offset = binfo_for_vbase (BINFO_TYPE (virtual_offset),
2072 else if (!same_type_ignoring_top_level_qualifiers_p
2073 (over_return, base_return))
2075 /* There was no existing virtual thunk (which takes
2076 precedence). So find the binfo of the base function's
2077 return type within the overriding function's return type.
2078 We cannot call lookup base here, because we're inside a
2079 dfs_walk, and will therefore clobber the BINFO_MARKED
2080 flags. Fortunately we know the covariancy is valid (it
2081 has already been checked), so we can just iterate along
2082 the binfos, which have been chained in inheritance graph
2083 order. Of course it is lame that we have to repeat the
2084 search here anyway -- we should really be caching pieces
2085 of the vtable and avoiding this repeated work. */
2086 tree thunk_binfo, base_binfo;
2088 /* Find the base binfo within the overriding function's
2089 return type. We will always find a thunk_binfo, except
2090 when the covariancy is invalid (which we will have
2091 already diagnosed). */
2092 for (base_binfo = TYPE_BINFO (base_return),
2093 thunk_binfo = TYPE_BINFO (over_return);
2095 thunk_binfo = TREE_CHAIN (thunk_binfo))
2096 if (SAME_BINFO_TYPE_P (BINFO_TYPE (thunk_binfo),
2097 BINFO_TYPE (base_binfo)))
2100 /* See if virtual inheritance is involved. */
2101 for (virtual_offset = thunk_binfo;
2103 virtual_offset = BINFO_INHERITANCE_CHAIN (virtual_offset))
2104 if (BINFO_VIRTUAL_P (virtual_offset))
2108 || (thunk_binfo && !BINFO_OFFSET_ZEROP (thunk_binfo)))
2110 tree offset = convert (ssizetype, BINFO_OFFSET (thunk_binfo));
2114 /* We convert via virtual base. Adjust the fixed
2115 offset to be from there. */
2116 offset = size_diffop
2118 (ssizetype, BINFO_OFFSET (virtual_offset)));
2121 /* There was an existing fixed offset, this must be
2122 from the base just converted to, and the base the
2123 FN was thunking to. */
2124 fixed_offset = size_binop (PLUS_EXPR, fixed_offset, offset);
2126 fixed_offset = offset;
2130 if (fixed_offset || virtual_offset)
2131 /* Replace the overriding function with a covariant thunk. We
2132 will emit the overriding function in its own slot as
2134 overrider_fn = make_thunk (overrider_target, /*this_adjusting=*/0,
2135 fixed_offset, virtual_offset);
2138 gcc_assert (DECL_INVALID_OVERRIDER_P (overrider_target) ||
2139 !DECL_THUNK_P (fn));
2141 /* Assume that we will produce a thunk that convert all the way to
2142 the final overrider, and not to an intermediate virtual base. */
2143 virtual_base = NULL_TREE;
2145 /* See if we can convert to an intermediate virtual base first, and then
2146 use the vcall offset located there to finish the conversion. */
2147 for (; b; b = BINFO_INHERITANCE_CHAIN (b))
2149 /* If we find the final overrider, then we can stop
2151 if (SAME_BINFO_TYPE_P (BINFO_TYPE (b),
2152 BINFO_TYPE (TREE_VALUE (overrider))))
2155 /* If we find a virtual base, and we haven't yet found the
2156 overrider, then there is a virtual base between the
2157 declaring base (first_defn) and the final overrider. */
2158 if (BINFO_VIRTUAL_P (b))
2165 if (overrider_fn != overrider_target && !virtual_base)
2167 /* The ABI specifies that a covariant thunk includes a mangling
2168 for a this pointer adjustment. This-adjusting thunks that
2169 override a function from a virtual base have a vcall
2170 adjustment. When the virtual base in question is a primary
2171 virtual base, we know the adjustments are zero, (and in the
2172 non-covariant case, we would not use the thunk).
2173 Unfortunately we didn't notice this could happen, when
2174 designing the ABI and so never mandated that such a covariant
2175 thunk should be emitted. Because we must use the ABI mandated
2176 name, we must continue searching from the binfo where we
2177 found the most recent definition of the function, towards the
2178 primary binfo which first introduced the function into the
2179 vtable. If that enters a virtual base, we must use a vcall
2180 this-adjusting thunk. Bleah! */
2181 tree probe = first_defn;
2183 while ((probe = get_primary_binfo (probe))
2184 && (unsigned) list_length (BINFO_VIRTUALS (probe)) > ix)
2185 if (BINFO_VIRTUAL_P (probe))
2186 virtual_base = probe;
2189 /* Even if we find a virtual base, the correct delta is
2190 between the overrider and the binfo we're building a vtable
2192 goto virtual_covariant;
2195 /* Compute the constant adjustment to the `this' pointer. The
2196 `this' pointer, when this function is called, will point at BINFO
2197 (or one of its primary bases, which are at the same offset). */
2199 /* The `this' pointer needs to be adjusted from the declaration to
2200 the nearest virtual base. */
2201 delta = size_diffop (convert (ssizetype, BINFO_OFFSET (virtual_base)),
2202 convert (ssizetype, BINFO_OFFSET (first_defn)));
2204 /* If the nearest definition is in a lost primary, we don't need an
2205 entry in our vtable. Except possibly in a constructor vtable,
2206 if we happen to get our primary back. In that case, the offset
2207 will be zero, as it will be a primary base. */
2208 delta = size_zero_node;
2210 /* The `this' pointer needs to be adjusted from pointing to
2211 BINFO to pointing at the base where the final overrider
2214 delta = size_diffop (convert (ssizetype,
2215 BINFO_OFFSET (TREE_VALUE (overrider))),
2216 convert (ssizetype, BINFO_OFFSET (binfo)));
2218 modify_vtable_entry (t, binfo, overrider_fn, delta, virtuals);
2221 BV_VCALL_INDEX (*virtuals)
2222 = get_vcall_index (overrider_target, BINFO_TYPE (virtual_base));
2224 BV_VCALL_INDEX (*virtuals) = NULL_TREE;
2227 /* Called from modify_all_vtables via dfs_walk. */
2230 dfs_modify_vtables (tree binfo, void* data)
2232 tree t = (tree) data;
2237 if (!TYPE_CONTAINS_VPTR_P (BINFO_TYPE (binfo)))
2238 /* A base without a vtable needs no modification, and its bases
2239 are uninteresting. */
2240 return dfs_skip_bases;
2242 if (SAME_BINFO_TYPE_P (BINFO_TYPE (binfo), t)
2243 && !CLASSTYPE_HAS_PRIMARY_BASE_P (t))
2244 /* Don't do the primary vtable, if it's new. */
2247 if (BINFO_PRIMARY_P (binfo) && !BINFO_VIRTUAL_P (binfo))
2248 /* There's no need to modify the vtable for a non-virtual primary
2249 base; we're not going to use that vtable anyhow. We do still
2250 need to do this for virtual primary bases, as they could become
2251 non-primary in a construction vtable. */
2254 make_new_vtable (t, binfo);
2256 /* Now, go through each of the virtual functions in the virtual
2257 function table for BINFO. Find the final overrider, and update
2258 the BINFO_VIRTUALS list appropriately. */
2259 for (ix = 0, virtuals = BINFO_VIRTUALS (binfo),
2260 old_virtuals = BINFO_VIRTUALS (TYPE_BINFO (BINFO_TYPE (binfo)));
2262 ix++, virtuals = TREE_CHAIN (virtuals),
2263 old_virtuals = TREE_CHAIN (old_virtuals))
2264 update_vtable_entry_for_fn (t,
2266 BV_FN (old_virtuals),
2272 /* Update all of the primary and secondary vtables for T. Create new
2273 vtables as required, and initialize their RTTI information. Each
2274 of the functions in VIRTUALS is declared in T and may override a
2275 virtual function from a base class; find and modify the appropriate
2276 entries to point to the overriding functions. Returns a list, in
2277 declaration order, of the virtual functions that are declared in T,
2278 but do not appear in the primary base class vtable, and which
2279 should therefore be appended to the end of the vtable for T. */
2282 modify_all_vtables (tree t, tree virtuals)
2284 tree binfo = TYPE_BINFO (t);
2287 /* Update all of the vtables. */
2288 dfs_walk_once (binfo, dfs_modify_vtables, NULL, t);
2290 /* Add virtual functions not already in our primary vtable. These
2291 will be both those introduced by this class, and those overridden
2292 from secondary bases. It does not include virtuals merely
2293 inherited from secondary bases. */
2294 for (fnsp = &virtuals; *fnsp; )
2296 tree fn = TREE_VALUE (*fnsp);
2298 if (!value_member (fn, BINFO_VIRTUALS (binfo))
2299 || DECL_VINDEX (fn) == error_mark_node)
2301 /* We don't need to adjust the `this' pointer when
2302 calling this function. */
2303 BV_DELTA (*fnsp) = integer_zero_node;
2304 BV_VCALL_INDEX (*fnsp) = NULL_TREE;
2306 /* This is a function not already in our vtable. Keep it. */
2307 fnsp = &TREE_CHAIN (*fnsp);
2310 /* We've already got an entry for this function. Skip it. */
2311 *fnsp = TREE_CHAIN (*fnsp);
2317 /* Get the base virtual function declarations in T that have the
2321 get_basefndecls (tree name, tree t)
2324 tree base_fndecls = NULL_TREE;
2325 int n_baseclasses = BINFO_N_BASE_BINFOS (TYPE_BINFO (t));
2328 /* Find virtual functions in T with the indicated NAME. */
2329 i = lookup_fnfields_1 (t, name);
2331 for (methods = VEC_index (tree, CLASSTYPE_METHOD_VEC (t), i);
2333 methods = OVL_NEXT (methods))
2335 tree method = OVL_CURRENT (methods);
2337 if (TREE_CODE (method) == FUNCTION_DECL
2338 && DECL_VINDEX (method))
2339 base_fndecls = tree_cons (NULL_TREE, method, base_fndecls);
2343 return base_fndecls;
2345 for (i = 0; i < n_baseclasses; i++)
2347 tree basetype = BINFO_TYPE (BINFO_BASE_BINFO (TYPE_BINFO (t), i));
2348 base_fndecls = chainon (get_basefndecls (name, basetype),
2352 return base_fndecls;
2355 /* If this declaration supersedes the declaration of
2356 a method declared virtual in the base class, then
2357 mark this field as being virtual as well. */
2360 check_for_override (tree decl, tree ctype)
2362 if (TREE_CODE (decl) == TEMPLATE_DECL)
2363 /* In [temp.mem] we have:
2365 A specialization of a member function template does not
2366 override a virtual function from a base class. */
2368 if ((DECL_DESTRUCTOR_P (decl)
2369 || IDENTIFIER_VIRTUAL_P (DECL_NAME (decl))
2370 || DECL_CONV_FN_P (decl))
2371 && look_for_overrides (ctype, decl)
2372 && !DECL_STATIC_FUNCTION_P (decl))
2373 /* Set DECL_VINDEX to a value that is neither an INTEGER_CST nor
2374 the error_mark_node so that we know it is an overriding
2376 DECL_VINDEX (decl) = decl;
2378 if (DECL_VIRTUAL_P (decl))
2380 if (!DECL_VINDEX (decl))
2381 DECL_VINDEX (decl) = error_mark_node;
2382 IDENTIFIER_VIRTUAL_P (DECL_NAME (decl)) = 1;
2386 /* Warn about hidden virtual functions that are not overridden in t.
2387 We know that constructors and destructors don't apply. */
2390 warn_hidden (tree t)
2392 VEC(tree,gc) *method_vec = CLASSTYPE_METHOD_VEC (t);
2396 /* We go through each separately named virtual function. */
2397 for (i = CLASSTYPE_FIRST_CONVERSION_SLOT;
2398 VEC_iterate (tree, method_vec, i, fns);
2409 /* All functions in this slot in the CLASSTYPE_METHOD_VEC will
2410 have the same name. Figure out what name that is. */
2411 name = DECL_NAME (OVL_CURRENT (fns));
2412 /* There are no possibly hidden functions yet. */
2413 base_fndecls = NULL_TREE;
2414 /* Iterate through all of the base classes looking for possibly
2415 hidden functions. */
2416 for (binfo = TYPE_BINFO (t), j = 0;
2417 BINFO_BASE_ITERATE (binfo, j, base_binfo); j++)
2419 tree basetype = BINFO_TYPE (base_binfo);
2420 base_fndecls = chainon (get_basefndecls (name, basetype),
2424 /* If there are no functions to hide, continue. */
2428 /* Remove any overridden functions. */
2429 for (fn = fns; fn; fn = OVL_NEXT (fn))
2431 fndecl = OVL_CURRENT (fn);
2432 if (DECL_VINDEX (fndecl))
2434 tree *prev = &base_fndecls;
2437 /* If the method from the base class has the same
2438 signature as the method from the derived class, it
2439 has been overridden. */
2440 if (same_signature_p (fndecl, TREE_VALUE (*prev)))
2441 *prev = TREE_CHAIN (*prev);
2443 prev = &TREE_CHAIN (*prev);
2447 /* Now give a warning for all base functions without overriders,
2448 as they are hidden. */
2449 while (base_fndecls)
2451 /* Here we know it is a hider, and no overrider exists. */
2452 warning (OPT_Woverloaded_virtual, "%q+D was hidden", TREE_VALUE (base_fndecls));
2453 warning (OPT_Woverloaded_virtual, " by %q+D", fns);
2454 base_fndecls = TREE_CHAIN (base_fndecls);
2459 /* Check for things that are invalid. There are probably plenty of other
2460 things we should check for also. */
2463 finish_struct_anon (tree t)
2467 for (field = TYPE_FIELDS (t); field; field = TREE_CHAIN (field))
2469 if (TREE_STATIC (field))
2471 if (TREE_CODE (field) != FIELD_DECL)
2474 if (DECL_NAME (field) == NULL_TREE
2475 && ANON_AGGR_TYPE_P (TREE_TYPE (field)))
2477 bool is_union = TREE_CODE (TREE_TYPE (field)) == UNION_TYPE;
2478 tree elt = TYPE_FIELDS (TREE_TYPE (field));
2479 for (; elt; elt = TREE_CHAIN (elt))
2481 /* We're generally only interested in entities the user
2482 declared, but we also find nested classes by noticing
2483 the TYPE_DECL that we create implicitly. You're
2484 allowed to put one anonymous union inside another,
2485 though, so we explicitly tolerate that. We use
2486 TYPE_ANONYMOUS_P rather than ANON_AGGR_TYPE_P so that
2487 we also allow unnamed types used for defining fields. */
2488 if (DECL_ARTIFICIAL (elt)
2489 && (!DECL_IMPLICIT_TYPEDEF_P (elt)
2490 || TYPE_ANONYMOUS_P (TREE_TYPE (elt))))
2493 if (TREE_CODE (elt) != FIELD_DECL)
2496 pedwarn ("%q+#D invalid; an anonymous union can "
2497 "only have non-static data members", elt);
2499 pedwarn ("%q+#D invalid; an anonymous struct can "
2500 "only have non-static data members", elt);
2504 if (TREE_PRIVATE (elt))
2507 pedwarn ("private member %q+#D in anonymous union", elt);
2509 pedwarn ("private member %q+#D in anonymous struct", elt);
2511 else if (TREE_PROTECTED (elt))
2514 pedwarn ("protected member %q+#D in anonymous union", elt);
2516 pedwarn ("protected member %q+#D in anonymous struct", elt);
2519 TREE_PRIVATE (elt) = TREE_PRIVATE (field);
2520 TREE_PROTECTED (elt) = TREE_PROTECTED (field);
2526 /* Add T to CLASSTYPE_DECL_LIST of current_class_type which
2527 will be used later during class template instantiation.
2528 When FRIEND_P is zero, T can be a static member data (VAR_DECL),
2529 a non-static member data (FIELD_DECL), a member function
2530 (FUNCTION_DECL), a nested type (RECORD_TYPE, ENUM_TYPE),
2531 a typedef (TYPE_DECL) or a member class template (TEMPLATE_DECL)
2532 When FRIEND_P is nonzero, T is either a friend class
2533 (RECORD_TYPE, TEMPLATE_DECL) or a friend function
2534 (FUNCTION_DECL, TEMPLATE_DECL). */
2537 maybe_add_class_template_decl_list (tree type, tree t, int friend_p)
2539 /* Save some memory by not creating TREE_LIST if TYPE is not template. */
2540 if (CLASSTYPE_TEMPLATE_INFO (type))
2541 CLASSTYPE_DECL_LIST (type)
2542 = tree_cons (friend_p ? NULL_TREE : type,
2543 t, CLASSTYPE_DECL_LIST (type));
2546 /* Create default constructors, assignment operators, and so forth for
2547 the type indicated by T, if they are needed. CANT_HAVE_CONST_CTOR,
2548 and CANT_HAVE_CONST_ASSIGNMENT are nonzero if, for whatever reason,
2549 the class cannot have a default constructor, copy constructor
2550 taking a const reference argument, or an assignment operator taking
2551 a const reference, respectively. */
2554 add_implicitly_declared_members (tree t,
2555 int cant_have_const_cctor,
2556 int cant_have_const_assignment)
2559 if (!CLASSTYPE_DESTRUCTORS (t))
2561 /* In general, we create destructors lazily. */
2562 CLASSTYPE_LAZY_DESTRUCTOR (t) = 1;
2563 /* However, if the implicit destructor is non-trivial
2564 destructor, we sometimes have to create it at this point. */
2565 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (t))
2569 if (TYPE_FOR_JAVA (t))
2570 /* If this a Java class, any non-trivial destructor is
2571 invalid, even if compiler-generated. Therefore, if the
2572 destructor is non-trivial we create it now. */
2580 /* If the implicit destructor will be virtual, then we must
2581 generate it now because (unfortunately) we do not
2582 generate virtual tables lazily. */
2583 binfo = TYPE_BINFO (t);
2584 for (ix = 0; BINFO_BASE_ITERATE (binfo, ix, base_binfo); ix++)
2589 base_type = BINFO_TYPE (base_binfo);
2590 dtor = CLASSTYPE_DESTRUCTORS (base_type);
2591 if (dtor && DECL_VIRTUAL_P (dtor))
2599 /* If we can't get away with being lazy, generate the destructor
2602 lazily_declare_fn (sfk_destructor, t);
2608 If there is no user-declared constructor for a class, a default
2609 constructor is implicitly declared. */
2610 if (! TYPE_HAS_USER_CONSTRUCTOR (t))
2612 TYPE_HAS_DEFAULT_CONSTRUCTOR (t) = 1;
2613 CLASSTYPE_LAZY_DEFAULT_CTOR (t) = 1;
2618 If a class definition does not explicitly declare a copy
2619 constructor, one is declared implicitly. */
2620 if (! TYPE_HAS_INIT_REF (t) && ! TYPE_FOR_JAVA (t))
2622 TYPE_HAS_INIT_REF (t) = 1;
2623 TYPE_HAS_CONST_INIT_REF (t) = !cant_have_const_cctor;
2624 CLASSTYPE_LAZY_COPY_CTOR (t) = 1;
2627 /* If there is no assignment operator, one will be created if and
2628 when it is needed. For now, just record whether or not the type
2629 of the parameter to the assignment operator will be a const or
2630 non-const reference. */
2631 if (!TYPE_HAS_ASSIGN_REF (t) && !TYPE_FOR_JAVA (t))
2633 TYPE_HAS_ASSIGN_REF (t) = 1;
2634 TYPE_HAS_CONST_ASSIGN_REF (t) = !cant_have_const_assignment;
2635 CLASSTYPE_LAZY_ASSIGNMENT_OP (t) = 1;
2639 /* Subroutine of finish_struct_1. Recursively count the number of fields
2640 in TYPE, including anonymous union members. */
2643 count_fields (tree fields)
2647 for (x = fields; x; x = TREE_CHAIN (x))
2649 if (TREE_CODE (x) == FIELD_DECL && ANON_AGGR_TYPE_P (TREE_TYPE (x)))
2650 n_fields += count_fields (TYPE_FIELDS (TREE_TYPE (x)));
2657 /* Subroutine of finish_struct_1. Recursively add all the fields in the
2658 TREE_LIST FIELDS to the SORTED_FIELDS_TYPE elts, starting at offset IDX. */
2661 add_fields_to_record_type (tree fields, struct sorted_fields_type *field_vec, int idx)
2664 for (x = fields; x; x = TREE_CHAIN (x))
2666 if (TREE_CODE (x) == FIELD_DECL && ANON_AGGR_TYPE_P (TREE_TYPE (x)))
2667 idx = add_fields_to_record_type (TYPE_FIELDS (TREE_TYPE (x)), field_vec, idx);
2669 field_vec->elts[idx++] = x;
2674 /* FIELD is a bit-field. We are finishing the processing for its
2675 enclosing type. Issue any appropriate messages and set appropriate
2676 flags. Returns false if an error has been diagnosed. */
2679 check_bitfield_decl (tree field)
2681 tree type = TREE_TYPE (field);
2684 /* Extract the declared width of the bitfield, which has been
2685 temporarily stashed in DECL_INITIAL. */
2686 w = DECL_INITIAL (field);
2687 gcc_assert (w != NULL_TREE);
2688 /* Remove the bit-field width indicator so that the rest of the
2689 compiler does not treat that value as an initializer. */
2690 DECL_INITIAL (field) = NULL_TREE;
2692 /* Detect invalid bit-field type. */
2693 if (!INTEGRAL_TYPE_P (type))
2695 error ("bit-field %q+#D with non-integral type", field);
2696 w = error_mark_node;
2700 /* Avoid the non_lvalue wrapper added by fold for PLUS_EXPRs. */
2703 /* detect invalid field size. */
2704 w = integral_constant_value (w);
2706 if (TREE_CODE (w) != INTEGER_CST)
2708 error ("bit-field %q+D width not an integer constant", field);
2709 w = error_mark_node;
2711 else if (tree_int_cst_sgn (w) < 0)
2713 error ("negative width in bit-field %q+D", field);
2714 w = error_mark_node;
2716 else if (integer_zerop (w) && DECL_NAME (field) != 0)
2718 error ("zero width for bit-field %q+D", field);
2719 w = error_mark_node;
2721 else if (compare_tree_int (w, TYPE_PRECISION (type)) > 0
2722 && TREE_CODE (type) != ENUMERAL_TYPE
2723 && TREE_CODE (type) != BOOLEAN_TYPE)
2724 warning (0, "width of %q+D exceeds its type", field);
2725 else if (TREE_CODE (type) == ENUMERAL_TYPE
2726 && (0 > compare_tree_int (w,
2727 min_precision (TYPE_MIN_VALUE (type),
2728 TYPE_UNSIGNED (type)))
2729 || 0 > compare_tree_int (w,
2731 (TYPE_MAX_VALUE (type),
2732 TYPE_UNSIGNED (type)))))
2733 warning (0, "%q+D is too small to hold all values of %q#T", field, type);
2736 if (w != error_mark_node)
2738 DECL_SIZE (field) = convert (bitsizetype, w);
2739 DECL_BIT_FIELD (field) = 1;
2744 /* Non-bit-fields are aligned for their type. */
2745 DECL_BIT_FIELD (field) = 0;
2746 CLEAR_DECL_C_BIT_FIELD (field);
2751 /* FIELD is a non bit-field. We are finishing the processing for its
2752 enclosing type T. Issue any appropriate messages and set appropriate
2756 check_field_decl (tree field,
2758 int* cant_have_const_ctor,
2759 int* no_const_asn_ref,
2760 int* any_default_members)
2762 tree type = strip_array_types (TREE_TYPE (field));
2764 /* An anonymous union cannot contain any fields which would change
2765 the settings of CANT_HAVE_CONST_CTOR and friends. */
2766 if (ANON_UNION_TYPE_P (type))
2768 /* And, we don't set TYPE_HAS_CONST_INIT_REF, etc., for anonymous
2769 structs. So, we recurse through their fields here. */
2770 else if (ANON_AGGR_TYPE_P (type))
2774 for (fields = TYPE_FIELDS (type); fields; fields = TREE_CHAIN (fields))
2775 if (TREE_CODE (fields) == FIELD_DECL && !DECL_C_BIT_FIELD (field))
2776 check_field_decl (fields, t, cant_have_const_ctor,
2777 no_const_asn_ref, any_default_members);
2779 /* Check members with class type for constructors, destructors,
2781 else if (CLASS_TYPE_P (type))
2783 /* Never let anything with uninheritable virtuals
2784 make it through without complaint. */
2785 abstract_virtuals_error (field, type);
2787 if (TREE_CODE (t) == UNION_TYPE)
2789 if (TYPE_NEEDS_CONSTRUCTING (type))
2790 error ("member %q+#D with constructor not allowed in union",
2792 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type))
2793 error ("member %q+#D with destructor not allowed in union", field);
2794 if (TYPE_HAS_COMPLEX_ASSIGN_REF (type))
2795 error ("member %q+#D with copy assignment operator not allowed in union",
2800 TYPE_NEEDS_CONSTRUCTING (t) |= TYPE_NEEDS_CONSTRUCTING (type);
2801 TYPE_HAS_NONTRIVIAL_DESTRUCTOR (t)
2802 |= TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type);
2803 TYPE_HAS_COMPLEX_ASSIGN_REF (t) |= TYPE_HAS_COMPLEX_ASSIGN_REF (type);
2804 TYPE_HAS_COMPLEX_INIT_REF (t) |= TYPE_HAS_COMPLEX_INIT_REF (type);
2805 TYPE_HAS_COMPLEX_DFLT (t) |= TYPE_HAS_COMPLEX_DFLT (type);
2808 if (!TYPE_HAS_CONST_INIT_REF (type))
2809 *cant_have_const_ctor = 1;
2811 if (!TYPE_HAS_CONST_ASSIGN_REF (type))
2812 *no_const_asn_ref = 1;
2814 if (DECL_INITIAL (field) != NULL_TREE)
2816 /* `build_class_init_list' does not recognize
2818 if (TREE_CODE (t) == UNION_TYPE && any_default_members != 0)
2819 error ("multiple fields in union %qT initialized", t);
2820 *any_default_members = 1;
2824 /* Check the data members (both static and non-static), class-scoped
2825 typedefs, etc., appearing in the declaration of T. Issue
2826 appropriate diagnostics. Sets ACCESS_DECLS to a list (in
2827 declaration order) of access declarations; each TREE_VALUE in this
2828 list is a USING_DECL.
2830 In addition, set the following flags:
2833 The class is empty, i.e., contains no non-static data members.
2835 CANT_HAVE_CONST_CTOR_P
2836 This class cannot have an implicitly generated copy constructor
2837 taking a const reference.
2839 CANT_HAVE_CONST_ASN_REF
2840 This class cannot have an implicitly generated assignment
2841 operator taking a const reference.
2843 All of these flags should be initialized before calling this
2846 Returns a pointer to the end of the TYPE_FIELDs chain; additional
2847 fields can be added by adding to this chain. */
2850 check_field_decls (tree t, tree *access_decls,
2851 int *cant_have_const_ctor_p,
2852 int *no_const_asn_ref_p)
2857 int any_default_members;
2860 /* Assume there are no access declarations. */
2861 *access_decls = NULL_TREE;
2862 /* Assume this class has no pointer members. */
2863 has_pointers = false;
2864 /* Assume none of the members of this class have default
2866 any_default_members = 0;
2868 for (field = &TYPE_FIELDS (t); *field; field = next)
2871 tree type = TREE_TYPE (x);
2873 next = &TREE_CHAIN (x);
2875 if (TREE_CODE (x) == USING_DECL)
2877 /* Prune the access declaration from the list of fields. */
2878 *field = TREE_CHAIN (x);
2880 /* Save the access declarations for our caller. */
2881 *access_decls = tree_cons (NULL_TREE, x, *access_decls);
2883 /* Since we've reset *FIELD there's no reason to skip to the
2889 if (TREE_CODE (x) == TYPE_DECL
2890 || TREE_CODE (x) == TEMPLATE_DECL)
2893 /* If we've gotten this far, it's a data member, possibly static,
2894 or an enumerator. */
2895 DECL_CONTEXT (x) = t;
2897 /* When this goes into scope, it will be a non-local reference. */
2898 DECL_NONLOCAL (x) = 1;
2900 if (TREE_CODE (t) == UNION_TYPE)
2904 If a union contains a static data member, or a member of
2905 reference type, the program is ill-formed. */
2906 if (TREE_CODE (x) == VAR_DECL)
2908 error ("%q+D may not be static because it is a member of a union", x);
2911 if (TREE_CODE (type) == REFERENCE_TYPE)
2913 error ("%q+D may not have reference type %qT because"
2914 " it is a member of a union",
2920 /* Perform error checking that did not get done in
2922 if (TREE_CODE (type) == FUNCTION_TYPE)
2924 error ("field %q+D invalidly declared function type", x);
2925 type = build_pointer_type (type);
2926 TREE_TYPE (x) = type;
2928 else if (TREE_CODE (type) == METHOD_TYPE)
2930 error ("field %q+D invalidly declared method type", x);
2931 type = build_pointer_type (type);
2932 TREE_TYPE (x) = type;
2935 if (type == error_mark_node)
2938 if (TREE_CODE (x) == CONST_DECL || TREE_CODE (x) == VAR_DECL)
2941 /* Now it can only be a FIELD_DECL. */
2943 if (TREE_PRIVATE (x) || TREE_PROTECTED (x))
2944 CLASSTYPE_NON_AGGREGATE (t) = 1;
2946 /* If this is of reference type, check if it needs an init. */
2947 if (TREE_CODE (type) == REFERENCE_TYPE)
2949 CLASSTYPE_NON_POD_P (t) = 1;
2950 if (DECL_INITIAL (x) == NULL_TREE)
2951 SET_CLASSTYPE_REF_FIELDS_NEED_INIT (t, 1);
2953 /* ARM $12.6.2: [A member initializer list] (or, for an
2954 aggregate, initialization by a brace-enclosed list) is the
2955 only way to initialize nonstatic const and reference
2957 TYPE_HAS_COMPLEX_ASSIGN_REF (t) = 1;
2960 type = strip_array_types (type);
2962 if (TYPE_PACKED (t))
2964 if (!pod_type_p (type) && !TYPE_PACKED (type))
2968 "ignoring packed attribute because of unpacked non-POD field %q+#D",
2972 else if (TYPE_ALIGN (TREE_TYPE (x)) > BITS_PER_UNIT)
2973 DECL_PACKED (x) = 1;
2976 if (DECL_C_BIT_FIELD (x) && integer_zerop (DECL_INITIAL (x)))
2977 /* We don't treat zero-width bitfields as making a class
2982 /* The class is non-empty. */
2983 CLASSTYPE_EMPTY_P (t) = 0;
2984 /* The class is not even nearly empty. */
2985 CLASSTYPE_NEARLY_EMPTY_P (t) = 0;
2986 /* If one of the data members contains an empty class,
2988 if (CLASS_TYPE_P (type)
2989 && CLASSTYPE_CONTAINS_EMPTY_CLASS_P (type))
2990 CLASSTYPE_CONTAINS_EMPTY_CLASS_P (t) = 1;
2993 /* This is used by -Weffc++ (see below). Warn only for pointers
2994 to members which might hold dynamic memory. So do not warn
2995 for pointers to functions or pointers to members. */
2996 if (TYPE_PTR_P (type)
2997 && !TYPE_PTRFN_P (type)
2998 && !TYPE_PTR_TO_MEMBER_P (type))
2999 has_pointers = true;
3001 if (CLASS_TYPE_P (type))
3003 if (CLASSTYPE_REF_FIELDS_NEED_INIT (type))
3004 SET_CLASSTYPE_REF_FIELDS_NEED_INIT (t, 1);
3005 if (CLASSTYPE_READONLY_FIELDS_NEED_INIT (type))
3006 SET_CLASSTYPE_READONLY_FIELDS_NEED_INIT (t, 1);
3009 if (DECL_MUTABLE_P (x) || TYPE_HAS_MUTABLE_P (type))
3010 CLASSTYPE_HAS_MUTABLE (t) = 1;
3012 if (! pod_type_p (type))
3013 /* DR 148 now allows pointers to members (which are POD themselves),
3014 to be allowed in POD structs. */
3015 CLASSTYPE_NON_POD_P (t) = 1;
3017 if (! zero_init_p (type))
3018 CLASSTYPE_NON_ZERO_INIT_P (t) = 1;
3020 /* If any field is const, the structure type is pseudo-const. */
3021 if (CP_TYPE_CONST_P (type))
3023 C_TYPE_FIELDS_READONLY (t) = 1;
3024 if (DECL_INITIAL (x) == NULL_TREE)
3025 SET_CLASSTYPE_READONLY_FIELDS_NEED_INIT (t, 1);
3027 /* ARM $12.6.2: [A member initializer list] (or, for an
3028 aggregate, initialization by a brace-enclosed list) is the
3029 only way to initialize nonstatic const and reference
3031 TYPE_HAS_COMPLEX_ASSIGN_REF (t) = 1;
3033 /* A field that is pseudo-const makes the structure likewise. */
3034 else if (CLASS_TYPE_P (type))
3036 C_TYPE_FIELDS_READONLY (t) |= C_TYPE_FIELDS_READONLY (type);
3037 SET_CLASSTYPE_READONLY_FIELDS_NEED_INIT (t,
3038 CLASSTYPE_READONLY_FIELDS_NEED_INIT (t)
3039 | CLASSTYPE_READONLY_FIELDS_NEED_INIT (type));
3042 /* Core issue 80: A nonstatic data member is required to have a
3043 different name from the class iff the class has a
3044 user-defined constructor. */
3045 if (constructor_name_p (DECL_NAME (x), t)
3046 && TYPE_HAS_USER_CONSTRUCTOR (t))
3047 pedwarn ("field %q+#D with same name as class", x);
3049 /* We set DECL_C_BIT_FIELD in grokbitfield.
3050 If the type and width are valid, we'll also set DECL_BIT_FIELD. */
3051 if (! DECL_C_BIT_FIELD (x) || ! check_bitfield_decl (x))
3052 check_field_decl (x, t,
3053 cant_have_const_ctor_p,
3055 &any_default_members);
3058 /* Effective C++ rule 11: if a class has dynamic memory held by pointers,
3059 it should also define a copy constructor and an assignment operator to
3060 implement the correct copy semantic (deep vs shallow, etc.). As it is
3061 not feasible to check whether the constructors do allocate dynamic memory
3062 and store it within members, we approximate the warning like this:
3064 -- Warn only if there are members which are pointers
3065 -- Warn only if there is a non-trivial constructor (otherwise,
3066 there cannot be memory allocated).
3067 -- Warn only if there is a non-trivial destructor. We assume that the
3068 user at least implemented the cleanup correctly, and a destructor
3069 is needed to free dynamic memory.
3071 This seems enough for practical purposes. */
3074 && TYPE_HAS_USER_CONSTRUCTOR (t)
3075 && TYPE_HAS_NONTRIVIAL_DESTRUCTOR (t)
3076 && !(TYPE_HAS_INIT_REF (t) && TYPE_HAS_ASSIGN_REF (t)))
3078 warning (OPT_Weffc__, "%q#T has pointer data members", t);
3080 if (! TYPE_HAS_INIT_REF (t))
3082 warning (OPT_Weffc__,
3083 " but does not override %<%T(const %T&)%>", t, t);
3084 if (!TYPE_HAS_ASSIGN_REF (t))
3085 warning (OPT_Weffc__, " or %<operator=(const %T&)%>", t);
3087 else if (! TYPE_HAS_ASSIGN_REF (t))
3088 warning (OPT_Weffc__,
3089 " but does not override %<operator=(const %T&)%>", t);
3092 /* If any of the fields couldn't be packed, unset TYPE_PACKED. */
3094 TYPE_PACKED (t) = 0;
3096 /* Check anonymous struct/anonymous union fields. */
3097 finish_struct_anon (t);
3099 /* We've built up the list of access declarations in reverse order.
3101 *access_decls = nreverse (*access_decls);
3104 /* If TYPE is an empty class type, records its OFFSET in the table of
3108 record_subobject_offset (tree type, tree offset, splay_tree offsets)
3112 if (!is_empty_class (type))
3115 /* Record the location of this empty object in OFFSETS. */
3116 n = splay_tree_lookup (offsets, (splay_tree_key) offset);
3118 n = splay_tree_insert (offsets,
3119 (splay_tree_key) offset,
3120 (splay_tree_value) NULL_TREE);
3121 n->value = ((splay_tree_value)
3122 tree_cons (NULL_TREE,
3129 /* Returns nonzero if TYPE is an empty class type and there is
3130 already an entry in OFFSETS for the same TYPE as the same OFFSET. */
3133 check_subobject_offset (tree type, tree offset, splay_tree offsets)
3138 if (!is_empty_class (type))
3141 /* Record the location of this empty object in OFFSETS. */
3142 n = splay_tree_lookup (offsets, (splay_tree_key) offset);
3146 for (t = (tree) n->value; t; t = TREE_CHAIN (t))
3147 if (same_type_p (TREE_VALUE (t), type))
3153 /* Walk through all the subobjects of TYPE (located at OFFSET). Call
3154 F for every subobject, passing it the type, offset, and table of
3155 OFFSETS. If VBASES_P is one, then virtual non-primary bases should
3158 If MAX_OFFSET is non-NULL, then subobjects with an offset greater
3159 than MAX_OFFSET will not be walked.
3161 If F returns a nonzero value, the traversal ceases, and that value
3162 is returned. Otherwise, returns zero. */
3165 walk_subobject_offsets (tree type,
3166 subobject_offset_fn f,
3173 tree type_binfo = NULL_TREE;
3175 /* If this OFFSET is bigger than the MAX_OFFSET, then we should
3177 if (max_offset && INT_CST_LT (max_offset, offset))
3180 if (type == error_mark_node)
3185 if (abi_version_at_least (2))
3187 type = BINFO_TYPE (type);
3190 if (CLASS_TYPE_P (type))
3196 /* Avoid recursing into objects that are not interesting. */
3197 if (!CLASSTYPE_CONTAINS_EMPTY_CLASS_P (type))
3200 /* Record the location of TYPE. */
3201 r = (*f) (type, offset, offsets);
3205 /* Iterate through the direct base classes of TYPE. */
3207 type_binfo = TYPE_BINFO (type);
3208 for (i = 0; BINFO_BASE_ITERATE (type_binfo, i, binfo); i++)
3212 if (abi_version_at_least (2)
3213 && BINFO_VIRTUAL_P (binfo))
3217 && BINFO_VIRTUAL_P (binfo)
3218 && !BINFO_PRIMARY_P (binfo))
3221 if (!abi_version_at_least (2))
3222 binfo_offset = size_binop (PLUS_EXPR,
3224 BINFO_OFFSET (binfo));
3228 /* We cannot rely on BINFO_OFFSET being set for the base
3229 class yet, but the offsets for direct non-virtual
3230 bases can be calculated by going back to the TYPE. */
3231 orig_binfo = BINFO_BASE_BINFO (TYPE_BINFO (type), i);
3232 binfo_offset = size_binop (PLUS_EXPR,
3234 BINFO_OFFSET (orig_binfo));
3237 r = walk_subobject_offsets (binfo,
3242 (abi_version_at_least (2)
3243 ? /*vbases_p=*/0 : vbases_p));
3248 if (abi_version_at_least (2) && CLASSTYPE_VBASECLASSES (type))
3251 VEC(tree,gc) *vbases;
3253 /* Iterate through the virtual base classes of TYPE. In G++
3254 3.2, we included virtual bases in the direct base class
3255 loop above, which results in incorrect results; the
3256 correct offsets for virtual bases are only known when
3257 working with the most derived type. */
3259 for (vbases = CLASSTYPE_VBASECLASSES (type), ix = 0;
3260 VEC_iterate (tree, vbases, ix, binfo); ix++)
3262 r = walk_subobject_offsets (binfo,
3264 size_binop (PLUS_EXPR,
3266 BINFO_OFFSET (binfo)),
3275 /* We still have to walk the primary base, if it is
3276 virtual. (If it is non-virtual, then it was walked
3278 tree vbase = get_primary_binfo (type_binfo);
3280 if (vbase && BINFO_VIRTUAL_P (vbase)
3281 && BINFO_PRIMARY_P (vbase)
3282 && BINFO_INHERITANCE_CHAIN (vbase) == type_binfo)
3284 r = (walk_subobject_offsets
3286 offsets, max_offset, /*vbases_p=*/0));
3293 /* Iterate through the fields of TYPE. */
3294 for (field = TYPE_FIELDS (type); field; field = TREE_CHAIN (field))
3295 if (TREE_CODE (field) == FIELD_DECL && !DECL_ARTIFICIAL (field))
3299 if (abi_version_at_least (2))
3300 field_offset = byte_position (field);
3302 /* In G++ 3.2, DECL_FIELD_OFFSET was used. */
3303 field_offset = DECL_FIELD_OFFSET (field);
3305 r = walk_subobject_offsets (TREE_TYPE (field),
3307 size_binop (PLUS_EXPR,
3317 else if (TREE_CODE (type) == ARRAY_TYPE)
3319 tree element_type = strip_array_types (type);
3320 tree domain = TYPE_DOMAIN (type);
3323 /* Avoid recursing into objects that are not interesting. */
3324 if (!CLASS_TYPE_P (element_type)
3325 || !CLASSTYPE_CONTAINS_EMPTY_CLASS_P (element_type))
3328 /* Step through each of the elements in the array. */
3329 for (index = size_zero_node;
3330 /* G++ 3.2 had an off-by-one error here. */
3331 (abi_version_at_least (2)
3332 ? !INT_CST_LT (TYPE_MAX_VALUE (domain), index)
3333 : INT_CST_LT (index, TYPE_MAX_VALUE (domain)));
3334 index = size_binop (PLUS_EXPR, index, size_one_node))
3336 r = walk_subobject_offsets (TREE_TYPE (type),
3344 offset = size_binop (PLUS_EXPR, offset,
3345 TYPE_SIZE_UNIT (TREE_TYPE (type)));
3346 /* If this new OFFSET is bigger than the MAX_OFFSET, then
3347 there's no point in iterating through the remaining
3348 elements of the array. */
3349 if (max_offset && INT_CST_LT (max_offset, offset))
3357 /* Record all of the empty subobjects of TYPE (either a type or a
3358 binfo). If IS_DATA_MEMBER is true, then a non-static data member
3359 is being placed at OFFSET; otherwise, it is a base class that is
3360 being placed at OFFSET. */
3363 record_subobject_offsets (tree type,
3366 bool is_data_member)
3369 /* If recording subobjects for a non-static data member or a
3370 non-empty base class , we do not need to record offsets beyond
3371 the size of the biggest empty class. Additional data members
3372 will go at the end of the class. Additional base classes will go
3373 either at offset zero (if empty, in which case they cannot
3374 overlap with offsets past the size of the biggest empty class) or
3375 at the end of the class.
3377 However, if we are placing an empty base class, then we must record
3378 all offsets, as either the empty class is at offset zero (where
3379 other empty classes might later be placed) or at the end of the
3380 class (where other objects might then be placed, so other empty
3381 subobjects might later overlap). */
3383 || !is_empty_class (BINFO_TYPE (type)))
3384 max_offset = sizeof_biggest_empty_class;
3386 max_offset = NULL_TREE;
3387 walk_subobject_offsets (type, record_subobject_offset, offset,
3388 offsets, max_offset, is_data_member);
3391 /* Returns nonzero if any of the empty subobjects of TYPE (located at
3392 OFFSET) conflict with entries in OFFSETS. If VBASES_P is nonzero,
3393 virtual bases of TYPE are examined. */
3396 layout_conflict_p (tree type,
3401 splay_tree_node max_node;
3403 /* Get the node in OFFSETS that indicates the maximum offset where
3404 an empty subobject is located. */
3405 max_node = splay_tree_max (offsets);
3406 /* If there aren't any empty subobjects, then there's no point in
3407 performing this check. */
3411 return walk_subobject_offsets (type, check_subobject_offset, offset,
3412 offsets, (tree) (max_node->key),
3416 /* DECL is a FIELD_DECL corresponding either to a base subobject of a
3417 non-static data member of the type indicated by RLI. BINFO is the
3418 binfo corresponding to the base subobject, OFFSETS maps offsets to
3419 types already located at those offsets. This function determines
3420 the position of the DECL. */
3423 layout_nonempty_base_or_field (record_layout_info rli,
3428 tree offset = NULL_TREE;
3434 /* For the purposes of determining layout conflicts, we want to
3435 use the class type of BINFO; TREE_TYPE (DECL) will be the
3436 CLASSTYPE_AS_BASE version, which does not contain entries for
3437 zero-sized bases. */
3438 type = TREE_TYPE (binfo);
3443 type = TREE_TYPE (decl);
3447 /* Try to place the field. It may take more than one try if we have
3448 a hard time placing the field without putting two objects of the
3449 same type at the same address. */
3452 struct record_layout_info_s old_rli = *rli;
3454 /* Place this field. */
3455 place_field (rli, decl);
3456 offset = byte_position (decl);
3458 /* We have to check to see whether or not there is already
3459 something of the same type at the offset we're about to use.
3460 For example, consider:
3463 struct T : public S { int i; };
3464 struct U : public S, public T {};
3466 Here, we put S at offset zero in U. Then, we can't put T at
3467 offset zero -- its S component would be at the same address
3468 as the S we already allocated. So, we have to skip ahead.
3469 Since all data members, including those whose type is an
3470 empty class, have nonzero size, any overlap can happen only
3471 with a direct or indirect base-class -- it can't happen with
3473 /* In a union, overlap is permitted; all members are placed at
3475 if (TREE_CODE (rli->t) == UNION_TYPE)
3477 /* G++ 3.2 did not check for overlaps when placing a non-empty
3479 if (!abi_version_at_least (2) && binfo && BINFO_VIRTUAL_P (binfo))
3481 if (layout_conflict_p (field_p ? type : binfo, offset,
3484 /* Strip off the size allocated to this field. That puts us
3485 at the first place we could have put the field with
3486 proper alignment. */
3489 /* Bump up by the alignment required for the type. */
3491 = size_binop (PLUS_EXPR, rli->bitpos,
3493 ? CLASSTYPE_ALIGN (type)
3494 : TYPE_ALIGN (type)));
3495 normalize_rli (rli);
3498 /* There was no conflict. We're done laying out this field. */
3502 /* Now that we know where it will be placed, update its
3504 if (binfo && CLASS_TYPE_P (BINFO_TYPE (binfo)))
3505 /* Indirect virtual bases may have a nonzero BINFO_OFFSET at
3506 this point because their BINFO_OFFSET is copied from another
3507 hierarchy. Therefore, we may not need to add the entire
3509 propagate_binfo_offsets (binfo,
3510 size_diffop (convert (ssizetype, offset),
3512 BINFO_OFFSET (binfo))));
3515 /* Returns true if TYPE is empty and OFFSET is nonzero. */
3518 empty_base_at_nonzero_offset_p (tree type,
3520 splay_tree offsets ATTRIBUTE_UNUSED)
3522 return is_empty_class (type) && !integer_zerop (offset);
3525 /* Layout the empty base BINFO. EOC indicates the byte currently just
3526 past the end of the class, and should be correctly aligned for a
3527 class of the type indicated by BINFO; OFFSETS gives the offsets of
3528 the empty bases allocated so far. T is the most derived
3529 type. Return nonzero iff we added it at the end. */
3532 layout_empty_base (record_layout_info rli, tree binfo,
3533 tree eoc, splay_tree offsets)
3536 tree basetype = BINFO_TYPE (binfo);
3539 /* This routine should only be used for empty classes. */
3540 gcc_assert (is_empty_class (basetype));
3541 alignment = ssize_int (CLASSTYPE_ALIGN_UNIT (basetype));
3543 if (!integer_zerop (BINFO_OFFSET (binfo)))
3545 if (abi_version_at_least (2))
3546 propagate_binfo_offsets
3547 (binfo, size_diffop (size_zero_node, BINFO_OFFSET (binfo)));
3550 "offset of empty base %qT may not be ABI-compliant and may"
3551 "change in a future version of GCC",
3552 BINFO_TYPE (binfo));
3555 /* This is an empty base class. We first try to put it at offset
3557 if (layout_conflict_p (binfo,
3558 BINFO_OFFSET (binfo),
3562 /* That didn't work. Now, we move forward from the next
3563 available spot in the class. */
3565 propagate_binfo_offsets (binfo, convert (ssizetype, eoc));
3568 if (!layout_conflict_p (binfo,
3569 BINFO_OFFSET (binfo),
3572 /* We finally found a spot where there's no overlap. */
3575 /* There's overlap here, too. Bump along to the next spot. */
3576 propagate_binfo_offsets (binfo, alignment);
3580 if (CLASSTYPE_USER_ALIGN (basetype))
3582 rli->record_align = MAX (rli->record_align, CLASSTYPE_ALIGN (basetype));
3584 rli->unpacked_align = MAX (rli->unpacked_align, CLASSTYPE_ALIGN (basetype));
3585 TYPE_USER_ALIGN (rli->t) = 1;
3591 /* Layout the base given by BINFO in the class indicated by RLI.
3592 *BASE_ALIGN is a running maximum of the alignments of
3593 any base class. OFFSETS gives the location of empty base
3594 subobjects. T is the most derived type. Return nonzero if the new
3595 object cannot be nearly-empty. A new FIELD_DECL is inserted at
3596 *NEXT_FIELD, unless BINFO is for an empty base class.
3598 Returns the location at which the next field should be inserted. */
3601 build_base_field (record_layout_info rli, tree binfo,
3602 splay_tree offsets, tree *next_field)
3605 tree basetype = BINFO_TYPE (binfo);
3607 if (!COMPLETE_TYPE_P (basetype))
3608 /* This error is now reported in xref_tag, thus giving better
3609 location information. */
3612 /* Place the base class. */
3613 if (!is_empty_class (basetype))
3617 /* The containing class is non-empty because it has a non-empty
3619 CLASSTYPE_EMPTY_P (t) = 0;
3621 /* Create the FIELD_DECL. */
3622 decl = build_decl (FIELD_DECL, NULL_TREE, CLASSTYPE_AS_BASE (basetype));
3623 DECL_ARTIFICIAL (decl) = 1;
3624 DECL_IGNORED_P (decl) = 1;
3625 DECL_FIELD_CONTEXT (decl) = t;
3626 if (CLASSTYPE_AS_BASE (basetype))
3628 DECL_SIZE (decl) = CLASSTYPE_SIZE (basetype);
3629 DECL_SIZE_UNIT (decl) = CLASSTYPE_SIZE_UNIT (basetype);
3630 DECL_ALIGN (decl) = CLASSTYPE_ALIGN (basetype);
3631 DECL_USER_ALIGN (decl) = CLASSTYPE_USER_ALIGN (basetype);
3632 DECL_MODE (decl) = TYPE_MODE (basetype);
3633 DECL_FIELD_IS_BASE (decl) = 1;
3635 /* Try to place the field. It may take more than one try if we
3636 have a hard time placing the field without putting two
3637 objects of the same type at the same address. */
3638 layout_nonempty_base_or_field (rli, decl, binfo, offsets);
3639 /* Add the new FIELD_DECL to the list of fields for T. */
3640 TREE_CHAIN (decl) = *next_field;
3642 next_field = &TREE_CHAIN (decl);
3650 /* On some platforms (ARM), even empty classes will not be
3652 eoc = round_up (rli_size_unit_so_far (rli),
3653 CLASSTYPE_ALIGN_UNIT (basetype));
3654 atend = layout_empty_base (rli, binfo, eoc, offsets);
3655 /* A nearly-empty class "has no proper base class that is empty,
3656 not morally virtual, and at an offset other than zero." */
3657 if (!BINFO_VIRTUAL_P (binfo) && CLASSTYPE_NEARLY_EMPTY_P (t))
3660 CLASSTYPE_NEARLY_EMPTY_P (t) = 0;
3661 /* The check above (used in G++ 3.2) is insufficient because
3662 an empty class placed at offset zero might itself have an
3663 empty base at a nonzero offset. */
3664 else if (walk_subobject_offsets (basetype,
3665 empty_base_at_nonzero_offset_p,
3668 /*max_offset=*/NULL_TREE,
3671 if (abi_version_at_least (2))
3672 CLASSTYPE_NEARLY_EMPTY_P (t) = 0;
3675 "class %qT will be considered nearly empty in a "
3676 "future version of GCC", t);
3680 /* We do not create a FIELD_DECL for empty base classes because
3681 it might overlap some other field. We want to be able to
3682 create CONSTRUCTORs for the class by iterating over the
3683 FIELD_DECLs, and the back end does not handle overlapping
3686 /* An empty virtual base causes a class to be non-empty
3687 -- but in that case we do not need to clear CLASSTYPE_EMPTY_P
3688 here because that was already done when the virtual table
3689 pointer was created. */
3692 /* Record the offsets of BINFO and its base subobjects. */
3693 record_subobject_offsets (binfo,
3694 BINFO_OFFSET (binfo),
3696 /*is_data_member=*/false);
3701 /* Layout all of the non-virtual base classes. Record empty
3702 subobjects in OFFSETS. T is the most derived type. Return nonzero
3703 if the type cannot be nearly empty. The fields created
3704 corresponding to the base classes will be inserted at
3708 build_base_fields (record_layout_info rli,
3709 splay_tree offsets, tree *next_field)
3711 /* Chain to hold all the new FIELD_DECLs which stand in for base class
3714 int n_baseclasses = BINFO_N_BASE_BINFOS (TYPE_BINFO (t));
3717 /* The primary base class is always allocated first. */
3718 if (CLASSTYPE_HAS_PRIMARY_BASE_P (t))
3719 next_field = build_base_field (rli, CLASSTYPE_PRIMARY_BINFO (t),
3720 offsets, next_field);
3722 /* Now allocate the rest of the bases. */
3723 for (i = 0; i < n_baseclasses; ++i)
3727 base_binfo = BINFO_BASE_BINFO (TYPE_BINFO (t), i);
3729 /* The primary base was already allocated above, so we don't
3730 need to allocate it again here. */
3731 if (base_binfo == CLASSTYPE_PRIMARY_BINFO (t))
3734 /* Virtual bases are added at the end (a primary virtual base
3735 will have already been added). */
3736 if (BINFO_VIRTUAL_P (base_binfo))
3739 next_field = build_base_field (rli, base_binfo,
3740 offsets, next_field);
3744 /* Go through the TYPE_METHODS of T issuing any appropriate
3745 diagnostics, figuring out which methods override which other
3746 methods, and so forth. */
3749 check_methods (tree t)
3753 for (x = TYPE_METHODS (t); x; x = TREE_CHAIN (x))
3755 check_for_override (x, t);
3756 if (DECL_PURE_VIRTUAL_P (x) && ! DECL_VINDEX (x))
3757 error ("initializer specified for non-virtual method %q+D", x);
3758 /* The name of the field is the original field name
3759 Save this in auxiliary field for later overloading. */
3760 if (DECL_VINDEX (x))
3762 TYPE_POLYMORPHIC_P (t) = 1;
3763 if (DECL_PURE_VIRTUAL_P (x))
3764 VEC_safe_push (tree, gc, CLASSTYPE_PURE_VIRTUALS (t), x);
3766 /* All user-declared destructors are non-trivial. */
3767 if (DECL_DESTRUCTOR_P (x))
3768 TYPE_HAS_NONTRIVIAL_DESTRUCTOR (t) = 1;
3772 /* FN is a constructor or destructor. Clone the declaration to create
3773 a specialized in-charge or not-in-charge version, as indicated by
3777 build_clone (tree fn, tree name)
3782 /* Copy the function. */
3783 clone = copy_decl (fn);
3784 /* Remember where this function came from. */
3785 DECL_CLONED_FUNCTION (clone) = fn;
3786 DECL_ABSTRACT_ORIGIN (clone) = fn;
3787 /* Reset the function name. */
3788 DECL_NAME (clone) = name;
3789 SET_DECL_ASSEMBLER_NAME (clone, NULL_TREE);
3790 /* There's no pending inline data for this function. */
3791 DECL_PENDING_INLINE_INFO (clone) = NULL;
3792 DECL_PENDING_INLINE_P (clone) = 0;
3793 /* And it hasn't yet been deferred. */
3794 DECL_DEFERRED_FN (clone) = 0;
3796 /* The base-class destructor is not virtual. */
3797 if (name == base_dtor_identifier)
3799 DECL_VIRTUAL_P (clone) = 0;
3800 if (TREE_CODE (clone) != TEMPLATE_DECL)
3801 DECL_VINDEX (clone) = NULL_TREE;
3804 /* If there was an in-charge parameter, drop it from the function
3806 if (DECL_HAS_IN_CHARGE_PARM_P (clone))
3812 exceptions = TYPE_RAISES_EXCEPTIONS (TREE_TYPE (clone));
3813 basetype = TYPE_METHOD_BASETYPE (TREE_TYPE (clone));
3814 parmtypes = TYPE_ARG_TYPES (TREE_TYPE (clone));
3815 /* Skip the `this' parameter. */
3816 parmtypes = TREE_CHAIN (parmtypes);
3817 /* Skip the in-charge parameter. */
3818 parmtypes = TREE_CHAIN (parmtypes);
3819 /* And the VTT parm, in a complete [cd]tor. */
3820 if (DECL_HAS_VTT_PARM_P (fn)
3821 && ! DECL_NEEDS_VTT_PARM_P (clone))
3822 parmtypes = TREE_CHAIN (parmtypes);
3823 /* If this is subobject constructor or destructor, add the vtt
3826 = build_method_type_directly (basetype,
3827 TREE_TYPE (TREE_TYPE (clone)),
3830 TREE_TYPE (clone) = build_exception_variant (TREE_TYPE (clone),
3833 = cp_build_type_attribute_variant (TREE_TYPE (clone),
3834 TYPE_ATTRIBUTES (TREE_TYPE (fn)));
3837 /* Copy the function parameters. But, DECL_ARGUMENTS on a TEMPLATE_DECL
3838 aren't function parameters; those are the template parameters. */
3839 if (TREE_CODE (clone) != TEMPLATE_DECL)
3841 DECL_ARGUMENTS (clone) = copy_list (DECL_ARGUMENTS (clone));
3842 /* Remove the in-charge parameter. */
3843 if (DECL_HAS_IN_CHARGE_PARM_P (clone))
3845 TREE_CHAIN (DECL_ARGUMENTS (clone))
3846 = TREE_CHAIN (TREE_CHAIN (DECL_ARGUMENTS (clone)));
3847 DECL_HAS_IN_CHARGE_PARM_P (clone) = 0;
3849 /* And the VTT parm, in a complete [cd]tor. */
3850 if (DECL_HAS_VTT_PARM_P (fn))
3852 if (DECL_NEEDS_VTT_PARM_P (clone))
3853 DECL_HAS_VTT_PARM_P (clone) = 1;
3856 TREE_CHAIN (DECL_ARGUMENTS (clone))
3857 = TREE_CHAIN (TREE_CHAIN (DECL_ARGUMENTS (clone)));
3858 DECL_HAS_VTT_PARM_P (clone) = 0;
3862 for (parms = DECL_ARGUMENTS (clone); parms; parms = TREE_CHAIN (parms))
3864 DECL_CONTEXT (parms) = clone;
3865 cxx_dup_lang_specific_decl (parms);
3869 /* Create the RTL for this function. */
3870 SET_DECL_RTL (clone, NULL_RTX);
3871 rest_of_decl_compilation (clone, /*top_level=*/1, at_eof);
3873 /* Make it easy to find the CLONE given the FN. */
3874 TREE_CHAIN (clone) = TREE_CHAIN (fn);
3875 TREE_CHAIN (fn) = clone;
3877 /* If this is a template, handle the DECL_TEMPLATE_RESULT as well. */
3878 if (TREE_CODE (clone) == TEMPLATE_DECL)
3882 DECL_TEMPLATE_RESULT (clone)
3883 = build_clone (DECL_TEMPLATE_RESULT (clone), name);
3884 result = DECL_TEMPLATE_RESULT (clone);
3885 DECL_TEMPLATE_INFO (result) = copy_node (DECL_TEMPLATE_INFO (result));
3886 DECL_TI_TEMPLATE (result) = clone;
3889 note_decl_for_pch (clone);
3894 /* Produce declarations for all appropriate clones of FN. If
3895 UPDATE_METHOD_VEC_P is nonzero, the clones are added to the
3896 CLASTYPE_METHOD_VEC as well. */
3899 clone_function_decl (tree fn, int update_method_vec_p)
3903 /* Avoid inappropriate cloning. */
3905 && DECL_CLONED_FUNCTION (TREE_CHAIN (fn)))
3908 if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (fn))
3910 /* For each constructor, we need two variants: an in-charge version
3911 and a not-in-charge version. */
3912 clone = build_clone (fn, complete_ctor_identifier);
3913 if (update_method_vec_p)
3914 add_method (DECL_CONTEXT (clone), clone, NULL_TREE);
3915 clone = build_clone (fn, base_ctor_identifier);
3916 if (update_method_vec_p)
3917 add_method (DECL_CONTEXT (clone), clone, NULL_TREE);
3921 gcc_assert (DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P (fn));
3923 /* For each destructor, we need three variants: an in-charge
3924 version, a not-in-charge version, and an in-charge deleting
3925 version. We clone the deleting version first because that
3926 means it will go second on the TYPE_METHODS list -- and that
3927 corresponds to the correct layout order in the virtual
3930 For a non-virtual destructor, we do not build a deleting
3932 if (DECL_VIRTUAL_P (fn))
3934 clone = build_clone (fn, deleting_dtor_identifier);
3935 if (update_method_vec_p)
3936 add_method (DECL_CONTEXT (clone), clone, NULL_TREE);
3938 clone = build_clone (fn, complete_dtor_identifier);
3939 if (update_method_vec_p)
3940 add_method (DECL_CONTEXT (clone), clone, NULL_TREE);
3941 clone = build_clone (fn, base_dtor_identifier);
3942 if (update_method_vec_p)
3943 add_method (DECL_CONTEXT (clone), clone, NULL_TREE);
3946 /* Note that this is an abstract function that is never emitted. */
3947 DECL_ABSTRACT (fn) = 1;
3950 /* DECL is an in charge constructor, which is being defined. This will
3951 have had an in class declaration, from whence clones were
3952 declared. An out-of-class definition can specify additional default
3953 arguments. As it is the clones that are involved in overload
3954 resolution, we must propagate the information from the DECL to its
3958 adjust_clone_args (tree decl)
3962 for (clone = TREE_CHAIN (decl); clone && DECL_CLONED_FUNCTION (clone);
3963 clone = TREE_CHAIN (clone))
3965 tree orig_clone_parms = TYPE_ARG_TYPES (TREE_TYPE (clone));
3966 tree orig_decl_parms = TYPE_ARG_TYPES (TREE_TYPE (decl));
3967 tree decl_parms, clone_parms;
3969 clone_parms = orig_clone_parms;
3971 /* Skip the 'this' parameter. */
3972 orig_clone_parms = TREE_CHAIN (orig_clone_parms);
3973 orig_decl_parms = TREE_CHAIN (orig_decl_parms);
3975 if (DECL_HAS_IN_CHARGE_PARM_P (decl))
3976 orig_decl_parms = TREE_CHAIN (orig_decl_parms);
3977 if (DECL_HAS_VTT_PARM_P (decl))
3978 orig_decl_parms = TREE_CHAIN (orig_decl_parms);
3980 clone_parms = orig_clone_parms;
3981 if (DECL_HAS_VTT_PARM_P (clone))
3982 clone_parms = TREE_CHAIN (clone_parms);
3984 for (decl_parms = orig_decl_parms; decl_parms;
3985 decl_parms = TREE_CHAIN (decl_parms),
3986 clone_parms = TREE_CHAIN (clone_parms))
3988 gcc_assert (same_type_p (TREE_TYPE (decl_parms),
3989 TREE_TYPE (clone_parms)));
3991 if (TREE_PURPOSE (decl_parms) && !TREE_PURPOSE (clone_parms))
3993 /* A default parameter has been added. Adjust the
3994 clone's parameters. */
3995 tree exceptions = TYPE_RAISES_EXCEPTIONS (TREE_TYPE (clone));
3996 tree basetype = TYPE_METHOD_BASETYPE (TREE_TYPE (clone));
3999 clone_parms = orig_decl_parms;
4001 if (DECL_HAS_VTT_PARM_P (clone))
4003 clone_parms = tree_cons (TREE_PURPOSE (orig_clone_parms),
4004 TREE_VALUE (orig_clone_parms),
4006 TREE_TYPE (clone_parms) = TREE_TYPE (orig_clone_parms);
4008 type = build_method_type_directly (basetype,
4009 TREE_TYPE (TREE_TYPE (clone)),
4012 type = build_exception_variant (type, exceptions);
4013 TREE_TYPE (clone) = type;
4015 clone_parms = NULL_TREE;
4019 gcc_assert (!clone_parms);
4023 /* For each of the constructors and destructors in T, create an
4024 in-charge and not-in-charge variant. */
4027 clone_constructors_and_destructors (tree t)
4031 /* If for some reason we don't have a CLASSTYPE_METHOD_VEC, we bail
4033 if (!CLASSTYPE_METHOD_VEC (t))
4036 for (fns = CLASSTYPE_CONSTRUCTORS (t); fns; fns = OVL_NEXT (fns))
4037 clone_function_decl (OVL_CURRENT (fns), /*update_method_vec_p=*/1);
4038 for (fns = CLASSTYPE_DESTRUCTORS (t); fns; fns = OVL_NEXT (fns))
4039 clone_function_decl (OVL_CURRENT (fns), /*update_method_vec_p=*/1);
4042 /* Returns true iff class T has a user-defined constructor other than
4043 the default constructor. */
4046 type_has_user_nondefault_constructor (tree t)
4050 if (!TYPE_HAS_USER_CONSTRUCTOR (t))
4053 for (fns = CLASSTYPE_CONSTRUCTORS (t); fns; fns = OVL_NEXT (fns))
4055 tree fn = OVL_CURRENT (fns);
4056 if (!DECL_ARTIFICIAL (fn)
4057 && skip_artificial_parms_for (fn, DECL_ARGUMENTS (fn)) != NULL_TREE)
4064 /* Remove all zero-width bit-fields from T. */
4067 remove_zero_width_bit_fields (tree t)
4071 fieldsp = &TYPE_FIELDS (t);
4074 if (TREE_CODE (*fieldsp) == FIELD_DECL
4075 && DECL_C_BIT_FIELD (*fieldsp)
4076 && DECL_INITIAL (*fieldsp))
4077 *fieldsp = TREE_CHAIN (*fieldsp);
4079 fieldsp = &TREE_CHAIN (*fieldsp);
4083 /* Returns TRUE iff we need a cookie when dynamically allocating an
4084 array whose elements have the indicated class TYPE. */
4087 type_requires_array_cookie (tree type)
4090 bool has_two_argument_delete_p = false;
4092 gcc_assert (CLASS_TYPE_P (type));
4094 /* If there's a non-trivial destructor, we need a cookie. In order
4095 to iterate through the array calling the destructor for each
4096 element, we'll have to know how many elements there are. */
4097 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type))
4100 /* If the usual deallocation function is a two-argument whose second
4101 argument is of type `size_t', then we have to pass the size of
4102 the array to the deallocation function, so we will need to store
4104 fns = lookup_fnfields (TYPE_BINFO (type),
4105 ansi_opname (VEC_DELETE_EXPR),
4107 /* If there are no `operator []' members, or the lookup is
4108 ambiguous, then we don't need a cookie. */
4109 if (!fns || fns == error_mark_node)
4111 /* Loop through all of the functions. */
4112 for (fns = BASELINK_FUNCTIONS (fns); fns; fns = OVL_NEXT (fns))
4117 /* Select the current function. */
4118 fn = OVL_CURRENT (fns);
4119 /* See if this function is a one-argument delete function. If
4120 it is, then it will be the usual deallocation function. */
4121 second_parm = TREE_CHAIN (TYPE_ARG_TYPES (TREE_TYPE (fn)));
4122 if (second_parm == void_list_node)
4124 /* Otherwise, if we have a two-argument function and the second
4125 argument is `size_t', it will be the usual deallocation
4126 function -- unless there is one-argument function, too. */
4127 if (TREE_CHAIN (second_parm) == void_list_node
4128 && same_type_p (TREE_VALUE (second_parm), size_type_node))
4129 has_two_argument_delete_p = true;
4132 return has_two_argument_delete_p;
4135 /* Check the validity of the bases and members declared in T. Add any
4136 implicitly-generated functions (like copy-constructors and
4137 assignment operators). Compute various flag bits (like
4138 CLASSTYPE_NON_POD_T) for T. This routine works purely at the C++
4139 level: i.e., independently of the ABI in use. */
4142 check_bases_and_members (tree t)
4144 /* Nonzero if the implicitly generated copy constructor should take
4145 a non-const reference argument. */
4146 int cant_have_const_ctor;
4147 /* Nonzero if the implicitly generated assignment operator
4148 should take a non-const reference argument. */
4149 int no_const_asn_ref;
4152 /* By default, we use const reference arguments and generate default
4154 cant_have_const_ctor = 0;
4155 no_const_asn_ref = 0;
4157 /* Check all the base-classes. */
4158 check_bases (t, &cant_have_const_ctor,
4161 /* Check all the method declarations. */
4164 /* Check all the data member declarations. We cannot call
4165 check_field_decls until we have called check_bases check_methods,
4166 as check_field_decls depends on TYPE_HAS_NONTRIVIAL_DESTRUCTOR
4167 being set appropriately. */
4168 check_field_decls (t, &access_decls,
4169 &cant_have_const_ctor,
4172 /* A nearly-empty class has to be vptr-containing; a nearly empty
4173 class contains just a vptr. */
4174 if (!TYPE_CONTAINS_VPTR_P (t))
4175 CLASSTYPE_NEARLY_EMPTY_P (t) = 0;
4177 /* Do some bookkeeping that will guide the generation of implicitly
4178 declared member functions. */
4179 TYPE_HAS_COMPLEX_INIT_REF (t)
4180 |= (TYPE_HAS_INIT_REF (t) || TYPE_CONTAINS_VPTR_P (t));
4181 /* We need to call a constructor for this class if it has a
4182 user-declared constructor, or if the default constructor is going
4183 to initialize the vptr. (This is not an if-and-only-if;
4184 TYPE_NEEDS_CONSTRUCTING is set elsewhere if bases or members
4185 themselves need constructing.) */
4186 TYPE_NEEDS_CONSTRUCTING (t)
4187 |= (TYPE_HAS_USER_CONSTRUCTOR (t) || TYPE_CONTAINS_VPTR_P (t));
4190 An aggregate is an arry or a class with no user-declared
4191 constructors ... and no virtual functions.
4193 Again, other conditions for being an aggregate are checked
4195 CLASSTYPE_NON_AGGREGATE (t)
4196 |= (TYPE_HAS_USER_CONSTRUCTOR (t) || TYPE_POLYMORPHIC_P (t));
4197 CLASSTYPE_NON_POD_P (t)
4198 |= (CLASSTYPE_NON_AGGREGATE (t)
4199 || TYPE_HAS_NONTRIVIAL_DESTRUCTOR (t)
4200 || TYPE_HAS_ASSIGN_REF (t));
4201 TYPE_HAS_COMPLEX_ASSIGN_REF (t)
4202 |= TYPE_HAS_ASSIGN_REF (t) || TYPE_CONTAINS_VPTR_P (t);
4203 TYPE_HAS_COMPLEX_DFLT (t)
4204 |= (TYPE_HAS_DEFAULT_CONSTRUCTOR (t) || TYPE_CONTAINS_VPTR_P (t));
4206 /* If the class has no user-declared constructor, but does have
4207 non-static const or reference data members that can never be
4208 initialized, issue a warning. */
4210 /* Classes with user-declared constructors are presumed to
4211 initialize these members. */
4212 && !TYPE_HAS_USER_CONSTRUCTOR (t)
4213 /* Aggregates can be initialized with brace-enclosed
4215 && CLASSTYPE_NON_AGGREGATE (t))
4219 for (field = TYPE_FIELDS (t); field; field = TREE_CHAIN (field))
4223 if (TREE_CODE (field) != FIELD_DECL)
4226 type = TREE_TYPE (field);
4227 if (TREE_CODE (type) == REFERENCE_TYPE)
4228 warning (OPT_Wextra, "non-static reference %q+#D in class "
4229 "without a constructor", field);
4230 else if (CP_TYPE_CONST_P (type)
4231 && (!CLASS_TYPE_P (type)
4232 || !TYPE_HAS_DEFAULT_CONSTRUCTOR (type)))
4233 warning (OPT_Wextra, "non-static const member %q+#D in class "
4234 "without a constructor", field);
4238 /* Synthesize any needed methods. */
4239 add_implicitly_declared_members (t,
4240 cant_have_const_ctor,
4243 /* Create the in-charge and not-in-charge variants of constructors
4245 clone_constructors_and_destructors (t);
4247 /* Process the using-declarations. */
4248 for (; access_decls; access_decls = TREE_CHAIN (access_decls))
4249 handle_using_decl (TREE_VALUE (access_decls), t);
4251 /* Build and sort the CLASSTYPE_METHOD_VEC. */
4252 finish_struct_methods (t);
4254 /* Figure out whether or not we will need a cookie when dynamically
4255 allocating an array of this type. */
4256 TYPE_LANG_SPECIFIC (t)->u.c.vec_new_uses_cookie
4257 = type_requires_array_cookie (t);
4260 /* If T needs a pointer to its virtual function table, set TYPE_VFIELD
4261 accordingly. If a new vfield was created (because T doesn't have a
4262 primary base class), then the newly created field is returned. It
4263 is not added to the TYPE_FIELDS list; it is the caller's
4264 responsibility to do that. Accumulate declared virtual functions
4268 create_vtable_ptr (tree t, tree* virtuals_p)
4272 /* Collect the virtual functions declared in T. */
4273 for (fn = TYPE_METHODS (t); fn; fn = TREE_CHAIN (fn))
4274 if (DECL_VINDEX (fn) && !DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P (fn)
4275 && TREE_CODE (DECL_VINDEX (fn)) != INTEGER_CST)
4277 tree new_virtual = make_node (TREE_LIST);
4279 BV_FN (new_virtual) = fn;
4280 BV_DELTA (new_virtual) = integer_zero_node;
4281 BV_VCALL_INDEX (new_virtual) = NULL_TREE;
4283 TREE_CHAIN (new_virtual) = *virtuals_p;
4284 *virtuals_p = new_virtual;
4287 /* If we couldn't find an appropriate base class, create a new field
4288 here. Even if there weren't any new virtual functions, we might need a
4289 new virtual function table if we're supposed to include vptrs in
4290 all classes that need them. */
4291 if (!TYPE_VFIELD (t) && (*virtuals_p || TYPE_CONTAINS_VPTR_P (t)))
4293 /* We build this decl with vtbl_ptr_type_node, which is a
4294 `vtable_entry_type*'. It might seem more precise to use
4295 `vtable_entry_type (*)[N]' where N is the number of virtual
4296 functions. However, that would require the vtable pointer in
4297 base classes to have a different type than the vtable pointer
4298 in derived classes. We could make that happen, but that
4299 still wouldn't solve all the problems. In particular, the
4300 type-based alias analysis code would decide that assignments
4301 to the base class vtable pointer can't alias assignments to
4302 the derived class vtable pointer, since they have different
4303 types. Thus, in a derived class destructor, where the base
4304 class constructor was inlined, we could generate bad code for
4305 setting up the vtable pointer.
4307 Therefore, we use one type for all vtable pointers. We still
4308 use a type-correct type; it's just doesn't indicate the array
4309 bounds. That's better than using `void*' or some such; it's
4310 cleaner, and it let's the alias analysis code know that these
4311 stores cannot alias stores to void*! */
4314 field = build_decl (FIELD_DECL, get_vfield_name (t), vtbl_ptr_type_node);
4315 DECL_VIRTUAL_P (field) = 1;
4316 DECL_ARTIFICIAL (field) = 1;
4317 DECL_FIELD_CONTEXT (field) = t;
4318 DECL_FCONTEXT (field) = t;
4320 TYPE_VFIELD (t) = field;
4322 /* This class is non-empty. */
4323 CLASSTYPE_EMPTY_P (t) = 0;
4331 /* Fixup the inline function given by INFO now that the class is
4335 fixup_pending_inline (tree fn)
4337 if (DECL_PENDING_INLINE_INFO (fn))
4339 tree args = DECL_ARGUMENTS (fn);
4342 DECL_CONTEXT (args) = fn;
4343 args = TREE_CHAIN (args);
4348 /* Fixup the inline methods and friends in TYPE now that TYPE is
4352 fixup_inline_methods (tree type)
4354 tree method = TYPE_METHODS (type);
4355 VEC(tree,gc) *friends;
4358 if (method && TREE_CODE (method) == TREE_VEC)
4360 if (TREE_VEC_ELT (method, 1))
4361 method = TREE_VEC_ELT (method, 1);
4362 else if (TREE_VEC_ELT (method, 0))
4363 method = TREE_VEC_ELT (method, 0);
4365 method = TREE_VEC_ELT (method, 2);
4368 /* Do inline member functions. */
4369 for (; method; method = TREE_CHAIN (method))
4370 fixup_pending_inline (method);
4373 for (friends = CLASSTYPE_INLINE_FRIENDS (type), ix = 0;
4374 VEC_iterate (tree, friends, ix, method); ix++)
4375 fixup_pending_inline (method);
4376 CLASSTYPE_INLINE_FRIENDS (type) = NULL;
4379 /* Add OFFSET to all base types of BINFO which is a base in the
4380 hierarchy dominated by T.
4382 OFFSET, which is a type offset, is number of bytes. */
4385 propagate_binfo_offsets (tree binfo, tree offset)
4391 /* Update BINFO's offset. */
4392 BINFO_OFFSET (binfo)
4393 = convert (sizetype,
4394 size_binop (PLUS_EXPR,
4395 convert (ssizetype, BINFO_OFFSET (binfo)),
4398 /* Find the primary base class. */
4399 primary_binfo = get_primary_binfo (binfo);
4401 if (primary_binfo && BINFO_INHERITANCE_CHAIN (primary_binfo) == binfo)
4402 propagate_binfo_offsets (primary_binfo, offset);
4404 /* Scan all of the bases, pushing the BINFO_OFFSET adjust
4406 for (i = 0; BINFO_BASE_ITERATE (binfo, i, base_binfo); ++i)
4408 /* Don't do the primary base twice. */
4409 if (base_binfo == primary_binfo)
4412 if (BINFO_VIRTUAL_P (base_binfo))
4415 propagate_binfo_offsets (base_binfo, offset);
4419 /* Set BINFO_OFFSET for all of the virtual bases for RLI->T. Update
4420 TYPE_ALIGN and TYPE_SIZE for T. OFFSETS gives the location of
4421 empty subobjects of T. */
4424 layout_virtual_bases (record_layout_info rli, splay_tree offsets)
4428 bool first_vbase = true;
4431 if (BINFO_N_BASE_BINFOS (TYPE_BINFO (t)) == 0)
4434 if (!abi_version_at_least(2))
4436 /* In G++ 3.2, we incorrectly rounded the size before laying out
4437 the virtual bases. */
4438 finish_record_layout (rli, /*free_p=*/false);
4439 #ifdef STRUCTURE_SIZE_BOUNDARY
4440 /* Packed structures don't need to have minimum size. */
4441 if (! TYPE_PACKED (t))
4442 TYPE_ALIGN (t) = MAX (TYPE_ALIGN (t), (unsigned) STRUCTURE_SIZE_BOUNDARY);
4444 rli->offset = TYPE_SIZE_UNIT (t);
4445 rli->bitpos = bitsize_zero_node;
4446 rli->record_align = TYPE_ALIGN (t);
4449 /* Find the last field. The artificial fields created for virtual
4450 bases will go after the last extant field to date. */
4451 next_field = &TYPE_FIELDS (t);
4453 next_field = &TREE_CHAIN (*next_field);
4455 /* Go through the virtual bases, allocating space for each virtual
4456 base that is not already a primary base class. These are
4457 allocated in inheritance graph order. */
4458 for (vbase = TYPE_BINFO (t); vbase; vbase = TREE_CHAIN (vbase))
4460 if (!BINFO_VIRTUAL_P (vbase))
4463 if (!BINFO_PRIMARY_P (vbase))
4465 tree basetype = TREE_TYPE (vbase);
4467 /* This virtual base is not a primary base of any class in the
4468 hierarchy, so we have to add space for it. */
4469 next_field = build_base_field (rli, vbase,
4470 offsets, next_field);
4472 /* If the first virtual base might have been placed at a
4473 lower address, had we started from CLASSTYPE_SIZE, rather
4474 than TYPE_SIZE, issue a warning. There can be both false
4475 positives and false negatives from this warning in rare
4476 cases; to deal with all the possibilities would probably
4477 require performing both layout algorithms and comparing
4478 the results which is not particularly tractable. */
4482 (size_binop (CEIL_DIV_EXPR,
4483 round_up (CLASSTYPE_SIZE (t),
4484 CLASSTYPE_ALIGN (basetype)),
4486 BINFO_OFFSET (vbase))))
4488 "offset of virtual base %qT is not ABI-compliant and "
4489 "may change in a future version of GCC",
4492 first_vbase = false;
4497 /* Returns the offset of the byte just past the end of the base class
4501 end_of_base (tree binfo)
4505 if (!CLASSTYPE_AS_BASE (BINFO_TYPE (binfo)))
4506 size = TYPE_SIZE_UNIT (char_type_node);
4507 else if (is_empty_class (BINFO_TYPE (binfo)))
4508 /* An empty class has zero CLASSTYPE_SIZE_UNIT, but we need to
4509 allocate some space for it. It cannot have virtual bases, so
4510 TYPE_SIZE_UNIT is fine. */
4511 size = TYPE_SIZE_UNIT (BINFO_TYPE (binfo));
4513 size = CLASSTYPE_SIZE_UNIT (BINFO_TYPE (binfo));
4515 return size_binop (PLUS_EXPR, BINFO_OFFSET (binfo), size);
4518 /* Returns the offset of the byte just past the end of the base class
4519 with the highest offset in T. If INCLUDE_VIRTUALS_P is zero, then
4520 only non-virtual bases are included. */
4523 end_of_class (tree t, int include_virtuals_p)
4525 tree result = size_zero_node;
4526 VEC(tree,gc) *vbases;
4532 for (binfo = TYPE_BINFO (t), i = 0;
4533 BINFO_BASE_ITERATE (binfo, i, base_binfo); ++i)
4535 if (!include_virtuals_p
4536 && BINFO_VIRTUAL_P (base_binfo)
4537 && (!BINFO_PRIMARY_P (base_binfo)
4538 || BINFO_INHERITANCE_CHAIN (base_binfo) != TYPE_BINFO (t)))
4541 offset = end_of_base (base_binfo);
4542 if (INT_CST_LT_UNSIGNED (result, offset))
4546 /* G++ 3.2 did not check indirect virtual bases. */
4547 if (abi_version_at_least (2) && include_virtuals_p)
4548 for (vbases = CLASSTYPE_VBASECLASSES (t), i = 0;
4549 VEC_iterate (tree, vbases, i, base_binfo); i++)
4551 offset = end_of_base (base_binfo);
4552 if (INT_CST_LT_UNSIGNED (result, offset))
4559 /* Warn about bases of T that are inaccessible because they are
4560 ambiguous. For example:
4563 struct T : public S {};
4564 struct U : public S, public T {};
4566 Here, `(S*) new U' is not allowed because there are two `S'
4570 warn_about_ambiguous_bases (tree t)
4573 VEC(tree,gc) *vbases;
4578 /* If there are no repeated bases, nothing can be ambiguous. */
4579 if (!CLASSTYPE_REPEATED_BASE_P (t))
4582 /* Check direct bases. */
4583 for (binfo = TYPE_BINFO (t), i = 0;
4584 BINFO_BASE_ITERATE (binfo, i, base_binfo); ++i)
4586 basetype = BINFO_TYPE (base_binfo);
4588 if (!lookup_base (t, basetype, ba_unique | ba_quiet, NULL))
4589 warning (0, "direct base %qT inaccessible in %qT due to ambiguity",
4593 /* Check for ambiguous virtual bases. */
4595 for (vbases = CLASSTYPE_VBASECLASSES (t), i = 0;
4596 VEC_iterate (tree, vbases, i, binfo); i++)
4598 basetype = BINFO_TYPE (binfo);
4600 if (!lookup_base (t, basetype, ba_unique | ba_quiet, NULL))
4601 warning (OPT_Wextra, "virtual base %qT inaccessible in %qT due to ambiguity",
4606 /* Compare two INTEGER_CSTs K1 and K2. */
4609 splay_tree_compare_integer_csts (splay_tree_key k1, splay_tree_key k2)
4611 return tree_int_cst_compare ((tree) k1, (tree) k2);
4614 /* Increase the size indicated in RLI to account for empty classes
4615 that are "off the end" of the class. */
4618 include_empty_classes (record_layout_info rli)
4623 /* It might be the case that we grew the class to allocate a
4624 zero-sized base class. That won't be reflected in RLI, yet,
4625 because we are willing to overlay multiple bases at the same
4626 offset. However, now we need to make sure that RLI is big enough
4627 to reflect the entire class. */
4628 eoc = end_of_class (rli->t,
4629 CLASSTYPE_AS_BASE (rli->t) != NULL_TREE);
4630 rli_size = rli_size_unit_so_far (rli);
4631 if (TREE_CODE (rli_size) == INTEGER_CST
4632 && INT_CST_LT_UNSIGNED (rli_size, eoc))
4634 if (!abi_version_at_least (2))
4635 /* In version 1 of the ABI, the size of a class that ends with
4636 a bitfield was not rounded up to a whole multiple of a
4637 byte. Because rli_size_unit_so_far returns only the number
4638 of fully allocated bytes, any extra bits were not included
4640 rli->bitpos = round_down (rli->bitpos, BITS_PER_UNIT);
4642 /* The size should have been rounded to a whole byte. */
4643 gcc_assert (tree_int_cst_equal
4644 (rli->bitpos, round_down (rli->bitpos, BITS_PER_UNIT)));
4646 = size_binop (PLUS_EXPR,
4648 size_binop (MULT_EXPR,
4649 convert (bitsizetype,
4650 size_binop (MINUS_EXPR,
4652 bitsize_int (BITS_PER_UNIT)));
4653 normalize_rli (rli);
4657 /* Calculate the TYPE_SIZE, TYPE_ALIGN, etc for T. Calculate
4658 BINFO_OFFSETs for all of the base-classes. Position the vtable
4659 pointer. Accumulate declared virtual functions on VIRTUALS_P. */
4662 layout_class_type (tree t, tree *virtuals_p)
4664 tree non_static_data_members;
4667 record_layout_info rli;
4668 /* Maps offsets (represented as INTEGER_CSTs) to a TREE_LIST of
4669 types that appear at that offset. */
4670 splay_tree empty_base_offsets;
4671 /* True if the last field layed out was a bit-field. */
4672 bool last_field_was_bitfield = false;
4673 /* The location at which the next field should be inserted. */
4675 /* T, as a base class. */
4678 /* Keep track of the first non-static data member. */
4679 non_static_data_members = TYPE_FIELDS (t);
4681 /* Start laying out the record. */
4682 rli = start_record_layout (t);
4684 /* Mark all the primary bases in the hierarchy. */
4685 determine_primary_bases (t);
4687 /* Create a pointer to our virtual function table. */
4688 vptr = create_vtable_ptr (t, virtuals_p);
4690 /* The vptr is always the first thing in the class. */
4693 TREE_CHAIN (vptr) = TYPE_FIELDS (t);
4694 TYPE_FIELDS (t) = vptr;
4695 next_field = &TREE_CHAIN (vptr);
4696 place_field (rli, vptr);
4699 next_field = &TYPE_FIELDS (t);
4701 /* Build FIELD_DECLs for all of the non-virtual base-types. */
4702 empty_base_offsets = splay_tree_new (splay_tree_compare_integer_csts,
4704 build_base_fields (rli, empty_base_offsets, next_field);
4706 /* Layout the non-static data members. */
4707 for (field = non_static_data_members; field; field = TREE_CHAIN (field))
4712 /* We still pass things that aren't non-static data members to
4713 the back end, in case it wants to do something with them. */
4714 if (TREE_CODE (field) != FIELD_DECL)
4716 place_field (rli, field);
4717 /* If the static data member has incomplete type, keep track
4718 of it so that it can be completed later. (The handling
4719 of pending statics in finish_record_layout is
4720 insufficient; consider:
4723 struct S2 { static S1 s1; };
4725 At this point, finish_record_layout will be called, but
4726 S1 is still incomplete.) */
4727 if (TREE_CODE (field) == VAR_DECL)
4729 maybe_register_incomplete_var (field);
4730 /* The visibility of static data members is determined
4731 at their point of declaration, not their point of
4733 determine_visibility (field);
4738 type = TREE_TYPE (field);
4739 if (type == error_mark_node)
4742 padding = NULL_TREE;
4744 /* If this field is a bit-field whose width is greater than its
4745 type, then there are some special rules for allocating
4747 if (DECL_C_BIT_FIELD (field)
4748 && INT_CST_LT (TYPE_SIZE (type), DECL_SIZE (field)))
4750 integer_type_kind itk;
4752 bool was_unnamed_p = false;
4753 /* We must allocate the bits as if suitably aligned for the
4754 longest integer type that fits in this many bits. type
4755 of the field. Then, we are supposed to use the left over
4756 bits as additional padding. */
4757 for (itk = itk_char; itk != itk_none; ++itk)
4758 if (INT_CST_LT (DECL_SIZE (field),
4759 TYPE_SIZE (integer_types[itk])))
4762 /* ITK now indicates a type that is too large for the
4763 field. We have to back up by one to find the largest
4765 integer_type = integer_types[itk - 1];
4767 /* Figure out how much additional padding is required. GCC
4768 3.2 always created a padding field, even if it had zero
4770 if (!abi_version_at_least (2)
4771 || INT_CST_LT (TYPE_SIZE (integer_type), DECL_SIZE (field)))
4773 if (abi_version_at_least (2) && TREE_CODE (t) == UNION_TYPE)
4774 /* In a union, the padding field must have the full width
4775 of the bit-field; all fields start at offset zero. */
4776 padding = DECL_SIZE (field);
4779 if (TREE_CODE (t) == UNION_TYPE)
4780 warning (OPT_Wabi, "size assigned to %qT may not be "
4781 "ABI-compliant and may change in a future "
4784 padding = size_binop (MINUS_EXPR, DECL_SIZE (field),
4785 TYPE_SIZE (integer_type));
4788 #ifdef PCC_BITFIELD_TYPE_MATTERS
4789 /* An unnamed bitfield does not normally affect the
4790 alignment of the containing class on a target where
4791 PCC_BITFIELD_TYPE_MATTERS. But, the C++ ABI does not
4792 make any exceptions for unnamed bitfields when the
4793 bitfields are longer than their types. Therefore, we
4794 temporarily give the field a name. */
4795 if (PCC_BITFIELD_TYPE_MATTERS && !DECL_NAME (field))
4797 was_unnamed_p = true;
4798 DECL_NAME (field) = make_anon_name ();
4801 DECL_SIZE (field) = TYPE_SIZE (integer_type);
4802 DECL_ALIGN (field) = TYPE_ALIGN (integer_type);
4803 DECL_USER_ALIGN (field) = TYPE_USER_ALIGN (integer_type);
4804 layout_nonempty_base_or_field (rli, field, NULL_TREE,
4805 empty_base_offsets);
4807 DECL_NAME (field) = NULL_TREE;
4808 /* Now that layout has been performed, set the size of the
4809 field to the size of its declared type; the rest of the
4810 field is effectively invisible. */
4811 DECL_SIZE (field) = TYPE_SIZE (type);
4812 /* We must also reset the DECL_MODE of the field. */
4813 if (abi_version_at_least (2))
4814 DECL_MODE (field) = TYPE_MODE (type);
4816 && DECL_MODE (field) != TYPE_MODE (type))
4817 /* Versions of G++ before G++ 3.4 did not reset the
4820 "the offset of %qD may not be ABI-compliant and may "
4821 "change in a future version of GCC", field);
4824 layout_nonempty_base_or_field (rli, field, NULL_TREE,
4825 empty_base_offsets);
4827 /* Remember the location of any empty classes in FIELD. */
4828 if (abi_version_at_least (2))
4829 record_subobject_offsets (TREE_TYPE (field),
4830 byte_position(field),
4832 /*is_data_member=*/true);
4834 /* If a bit-field does not immediately follow another bit-field,
4835 and yet it starts in the middle of a byte, we have failed to
4836 comply with the ABI. */
4838 && DECL_C_BIT_FIELD (field)
4839 /* The TREE_NO_WARNING flag gets set by Objective-C when
4840 laying out an Objective-C class. The ObjC ABI differs
4841 from the C++ ABI, and so we do not want a warning
4843 && !TREE_NO_WARNING (field)
4844 && !last_field_was_bitfield
4845 && !integer_zerop (size_binop (TRUNC_MOD_EXPR,
4846 DECL_FIELD_BIT_OFFSET (field),
4847 bitsize_unit_node)))
4848 warning (OPT_Wabi, "offset of %q+D is not ABI-compliant and may "
4849 "change in a future version of GCC", field);
4851 /* G++ used to use DECL_FIELD_OFFSET as if it were the byte
4852 offset of the field. */
4854 && !tree_int_cst_equal (DECL_FIELD_OFFSET (field),
4855 byte_position (field))
4856 && contains_empty_class_p (TREE_TYPE (field)))
4857 warning (OPT_Wabi, "%q+D contains empty classes which may cause base "
4858 "classes to be placed at different locations in a "
4859 "future version of GCC", field);
4861 /* The middle end uses the type of expressions to determine the
4862 possible range of expression values. In order to optimize
4863 "x.i > 7" to "false" for a 2-bit bitfield "i", the middle end
4864 must be made aware of the width of "i", via its type.
4866 Because C++ does not have integer types of arbitrary width,
4867 we must (for the purposes of the front end) convert from the
4868 type assigned here to the declared type of the bitfield
4869 whenever a bitfield expression is used as an rvalue.
4870 Similarly, when assigning a value to a bitfield, the value
4871 must be converted to the type given the bitfield here. */
4872 if (DECL_C_BIT_FIELD (field))
4874 unsigned HOST_WIDE_INT width;
4875 tree ftype = TREE_TYPE (field);
4876 width = tree_low_cst (DECL_SIZE (field), /*unsignedp=*/1);
4877 if (width != TYPE_PRECISION (ftype))
4880 = c_build_bitfield_integer_type (width,
4881 TYPE_UNSIGNED (ftype));
4883 = cp_build_qualified_type (TREE_TYPE (field),
4884 TYPE_QUALS (ftype));
4888 /* If we needed additional padding after this field, add it
4894 padding_field = build_decl (FIELD_DECL,
4897 DECL_BIT_FIELD (padding_field) = 1;
4898 DECL_SIZE (padding_field) = padding;
4899 DECL_CONTEXT (padding_field) = t;
4900 DECL_ARTIFICIAL (padding_field) = 1;
4901 DECL_IGNORED_P (padding_field) = 1;
4902 layout_nonempty_base_or_field (rli, padding_field,
4904 empty_base_offsets);
4907 last_field_was_bitfield = DECL_C_BIT_FIELD (field);
4910 if (abi_version_at_least (2) && !integer_zerop (rli->bitpos))
4912 /* Make sure that we are on a byte boundary so that the size of
4913 the class without virtual bases will always be a round number
4915 rli->bitpos = round_up (rli->bitpos, BITS_PER_UNIT);
4916 normalize_rli (rli);
4919 /* G++ 3.2 does not allow virtual bases to be overlaid with tail
4921 if (!abi_version_at_least (2))
4922 include_empty_classes(rli);
4924 /* Delete all zero-width bit-fields from the list of fields. Now
4925 that the type is laid out they are no longer important. */
4926 remove_zero_width_bit_fields (t);
4928 /* Create the version of T used for virtual bases. We do not use
4929 make_aggr_type for this version; this is an artificial type. For
4930 a POD type, we just reuse T. */
4931 if (CLASSTYPE_NON_POD_P (t) || CLASSTYPE_EMPTY_P (t))
4933 base_t = make_node (TREE_CODE (t));
4935 /* Set the size and alignment for the new type. In G++ 3.2, all
4936 empty classes were considered to have size zero when used as
4938 if (!abi_version_at_least (2) && CLASSTYPE_EMPTY_P (t))
4940 TYPE_SIZE (base_t) = bitsize_zero_node;
4941 TYPE_SIZE_UNIT (base_t) = size_zero_node;
4942 if (warn_abi && !integer_zerop (rli_size_unit_so_far (rli)))
4944 "layout of classes derived from empty class %qT "
4945 "may change in a future version of GCC",
4952 /* If the ABI version is not at least two, and the last
4953 field was a bit-field, RLI may not be on a byte
4954 boundary. In particular, rli_size_unit_so_far might
4955 indicate the last complete byte, while rli_size_so_far
4956 indicates the total number of bits used. Therefore,
4957 rli_size_so_far, rather than rli_size_unit_so_far, is
4958 used to compute TYPE_SIZE_UNIT. */
4959 eoc = end_of_class (t, /*include_virtuals_p=*/0);
4960 TYPE_SIZE_UNIT (base_t)
4961 = size_binop (MAX_EXPR,
4963 size_binop (CEIL_DIV_EXPR,
4964 rli_size_so_far (rli),
4965 bitsize_int (BITS_PER_UNIT))),
4968 = size_binop (MAX_EXPR,
4969 rli_size_so_far (rli),
4970 size_binop (MULT_EXPR,
4971 convert (bitsizetype, eoc),
4972 bitsize_int (BITS_PER_UNIT)));
4974 TYPE_ALIGN (base_t) = rli->record_align;
4975 TYPE_USER_ALIGN (base_t) = TYPE_USER_ALIGN (t);
4977 /* Copy the fields from T. */
4978 next_field = &TYPE_FIELDS (base_t);
4979 for (field = TYPE_FIELDS (t); field; field = TREE_CHAIN (field))
4980 if (TREE_CODE (field) == FIELD_DECL)
4982 *next_field = build_decl (FIELD_DECL,
4985 DECL_CONTEXT (*next_field) = base_t;
4986 DECL_FIELD_OFFSET (*next_field) = DECL_FIELD_OFFSET (field);
4987 DECL_FIELD_BIT_OFFSET (*next_field)
4988 = DECL_FIELD_BIT_OFFSET (field);
4989 DECL_SIZE (*next_field) = DECL_SIZE (field);
4990 DECL_MODE (*next_field) = DECL_MODE (field);
4991 next_field = &TREE_CHAIN (*next_field);
4994 /* Record the base version of the type. */
4995 CLASSTYPE_AS_BASE (t) = base_t;
4996 TYPE_CONTEXT (base_t) = t;
4999 CLASSTYPE_AS_BASE (t) = t;
5001 /* Every empty class contains an empty class. */
5002 if (CLASSTYPE_EMPTY_P (t))
5003 CLASSTYPE_CONTAINS_EMPTY_CLASS_P (t) = 1;
5005 /* Set the TYPE_DECL for this type to contain the right
5006 value for DECL_OFFSET, so that we can use it as part
5007 of a COMPONENT_REF for multiple inheritance. */
5008 layout_decl (TYPE_MAIN_DECL (t), 0);
5010 /* Now fix up any virtual base class types that we left lying
5011 around. We must get these done before we try to lay out the
5012 virtual function table. As a side-effect, this will remove the
5013 base subobject fields. */
5014 layout_virtual_bases (rli, empty_base_offsets);
5016 /* Make sure that empty classes are reflected in RLI at this
5018 include_empty_classes(rli);
5020 /* Make sure not to create any structures with zero size. */
5021 if (integer_zerop (rli_size_unit_so_far (rli)) && CLASSTYPE_EMPTY_P (t))
5023 build_decl (FIELD_DECL, NULL_TREE, char_type_node));
5025 /* Let the back end lay out the type. */
5026 finish_record_layout (rli, /*free_p=*/true);
5028 /* Warn about bases that can't be talked about due to ambiguity. */
5029 warn_about_ambiguous_bases (t);
5031 /* Now that we're done with layout, give the base fields the real types. */
5032 for (field = TYPE_FIELDS (t); field; field = TREE_CHAIN (field))
5033 if (DECL_ARTIFICIAL (field) && IS_FAKE_BASE_TYPE (TREE_TYPE (field)))
5034 TREE_TYPE (field) = TYPE_CONTEXT (TREE_TYPE (field));
5037 splay_tree_delete (empty_base_offsets);
5039 if (CLASSTYPE_EMPTY_P (t)
5040 && tree_int_cst_lt (sizeof_biggest_empty_class,
5041 TYPE_SIZE_UNIT (t)))
5042 sizeof_biggest_empty_class = TYPE_SIZE_UNIT (t);
5045 /* Determine the "key method" for the class type indicated by TYPE,
5046 and set CLASSTYPE_KEY_METHOD accordingly. */
5049 determine_key_method (tree type)
5053 if (TYPE_FOR_JAVA (type)
5054 || processing_template_decl
5055 || CLASSTYPE_TEMPLATE_INSTANTIATION (type)
5056 || CLASSTYPE_INTERFACE_KNOWN (type))
5059 /* The key method is the first non-pure virtual function that is not
5060 inline at the point of class definition. On some targets the
5061 key function may not be inline; those targets should not call
5062 this function until the end of the translation unit. */
5063 for (method = TYPE_METHODS (type); method != NULL_TREE;
5064 method = TREE_CHAIN (method))
5065 if (DECL_VINDEX (method) != NULL_TREE
5066 && ! DECL_DECLARED_INLINE_P (method)
5067 && ! DECL_PURE_VIRTUAL_P (method))
5069 CLASSTYPE_KEY_METHOD (type) = method;
5076 /* Perform processing required when the definition of T (a class type)
5080 finish_struct_1 (tree t)
5083 /* A TREE_LIST. The TREE_VALUE of each node is a FUNCTION_DECL. */
5084 tree virtuals = NULL_TREE;
5087 if (COMPLETE_TYPE_P (t))
5089 gcc_assert (IS_AGGR_TYPE (t));
5090 error ("redefinition of %q#T", t);
5095 /* If this type was previously laid out as a forward reference,
5096 make sure we lay it out again. */
5097 TYPE_SIZE (t) = NULL_TREE;
5098 CLASSTYPE_PRIMARY_BINFO (t) = NULL_TREE;
5100 fixup_inline_methods (t);
5102 /* Make assumptions about the class; we'll reset the flags if
5104 CLASSTYPE_EMPTY_P (t) = 1;
5105 CLASSTYPE_NEARLY_EMPTY_P (t) = 1;
5106 CLASSTYPE_CONTAINS_EMPTY_CLASS_P (t) = 0;
5108 /* Do end-of-class semantic processing: checking the validity of the
5109 bases and members and add implicitly generated methods. */
5110 check_bases_and_members (t);
5112 /* Find the key method. */
5113 if (TYPE_CONTAINS_VPTR_P (t))
5115 /* The Itanium C++ ABI permits the key method to be chosen when
5116 the class is defined -- even though the key method so
5117 selected may later turn out to be an inline function. On
5118 some systems (such as ARM Symbian OS) the key method cannot
5119 be determined until the end of the translation unit. On such
5120 systems, we leave CLASSTYPE_KEY_METHOD set to NULL, which
5121 will cause the class to be added to KEYED_CLASSES. Then, in
5122 finish_file we will determine the key method. */
5123 if (targetm.cxx.key_method_may_be_inline ())
5124 determine_key_method (t);
5126 /* If a polymorphic class has no key method, we may emit the vtable
5127 in every translation unit where the class definition appears. */
5128 if (CLASSTYPE_KEY_METHOD (t) == NULL_TREE)
5129 keyed_classes = tree_cons (NULL_TREE, t, keyed_classes);
5132 /* Layout the class itself. */
5133 layout_class_type (t, &virtuals);
5134 if (CLASSTYPE_AS_BASE (t) != t)
5135 /* We use the base type for trivial assignments, and hence it
5137 compute_record_mode (CLASSTYPE_AS_BASE (t));
5139 virtuals = modify_all_vtables (t, nreverse (virtuals));
5141 /* If necessary, create the primary vtable for this class. */
5142 if (virtuals || TYPE_CONTAINS_VPTR_P (t))
5144 /* We must enter these virtuals into the table. */
5145 if (!CLASSTYPE_HAS_PRIMARY_BASE_P (t))
5146 build_primary_vtable (NULL_TREE, t);
5147 else if (! BINFO_NEW_VTABLE_MARKED (TYPE_BINFO (t)))
5148 /* Here we know enough to change the type of our virtual
5149 function table, but we will wait until later this function. */
5150 build_primary_vtable (CLASSTYPE_PRIMARY_BINFO (t), t);
5153 if (TYPE_CONTAINS_VPTR_P (t))
5158 if (BINFO_VTABLE (TYPE_BINFO (t)))
5159 gcc_assert (DECL_VIRTUAL_P (BINFO_VTABLE (TYPE_BINFO (t))));
5160 if (!CLASSTYPE_HAS_PRIMARY_BASE_P (t))
5161 gcc_assert (BINFO_VIRTUALS (TYPE_BINFO (t)) == NULL_TREE);
5163 /* Add entries for virtual functions introduced by this class. */
5164 BINFO_VIRTUALS (TYPE_BINFO (t))
5165 = chainon (BINFO_VIRTUALS (TYPE_BINFO (t)), virtuals);
5167 /* Set DECL_VINDEX for all functions declared in this class. */
5168 for (vindex = 0, fn = BINFO_VIRTUALS (TYPE_BINFO (t));
5170 fn = TREE_CHAIN (fn),
5171 vindex += (TARGET_VTABLE_USES_DESCRIPTORS
5172 ? TARGET_VTABLE_USES_DESCRIPTORS : 1))
5174 tree fndecl = BV_FN (fn);
5176 if (DECL_THUNK_P (fndecl))
5177 /* A thunk. We should never be calling this entry directly
5178 from this vtable -- we'd use the entry for the non
5179 thunk base function. */
5180 DECL_VINDEX (fndecl) = NULL_TREE;
5181 else if (TREE_CODE (DECL_VINDEX (fndecl)) != INTEGER_CST)
5182 DECL_VINDEX (fndecl) = build_int_cst (NULL_TREE, vindex);
5186 finish_struct_bits (t);
5188 /* Complete the rtl for any static member objects of the type we're
5190 for (x = TYPE_FIELDS (t); x; x = TREE_CHAIN (x))
5191 if (TREE_CODE (x) == VAR_DECL && TREE_STATIC (x)
5192 && TREE_TYPE (x) != error_mark_node
5193 && same_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (x)), t))
5194 DECL_MODE (x) = TYPE_MODE (t);
5196 /* Done with FIELDS...now decide whether to sort these for
5197 faster lookups later.
5199 We use a small number because most searches fail (succeeding
5200 ultimately as the search bores through the inheritance
5201 hierarchy), and we want this failure to occur quickly. */
5203 n_fields = count_fields (TYPE_FIELDS (t));
5206 struct sorted_fields_type *field_vec = GGC_NEWVAR
5207 (struct sorted_fields_type,
5208 sizeof (struct sorted_fields_type) + n_fields * sizeof (tree));
5209 field_vec->len = n_fields;
5210 add_fields_to_record_type (TYPE_FIELDS (t), field_vec, 0);
5211 qsort (field_vec->elts, n_fields, sizeof (tree),
5213 if (! DECL_LANG_SPECIFIC (TYPE_MAIN_DECL (t)))
5214 retrofit_lang_decl (TYPE_MAIN_DECL (t));
5215 DECL_SORTED_FIELDS (TYPE_MAIN_DECL (t)) = field_vec;
5218 /* Complain if one of the field types requires lower visibility. */
5219 constrain_class_visibility (t);
5221 /* Make the rtl for any new vtables we have created, and unmark
5222 the base types we marked. */
5225 /* Build the VTT for T. */
5228 /* This warning does not make sense for Java classes, since they
5229 cannot have destructors. */
5230 if (!TYPE_FOR_JAVA (t) && warn_nonvdtor && TYPE_POLYMORPHIC_P (t))
5234 dtor = CLASSTYPE_DESTRUCTORS (t);
5235 if (/* An implicitly declared destructor is always public. And,
5236 if it were virtual, we would have created it by now. */
5238 || (!DECL_VINDEX (dtor)
5239 && (/* public non-virtual */
5240 (!TREE_PRIVATE (dtor) && !TREE_PROTECTED (dtor))
5241 || (/* non-public non-virtual with friends */
5242 (TREE_PRIVATE (dtor) || TREE_PROTECTED (dtor))
5243 && (CLASSTYPE_FRIEND_CLASSES (t)
5244 || DECL_FRIENDLIST (TYPE_MAIN_DECL (t)))))))
5245 warning (OPT_Wnon_virtual_dtor,
5246 "%q#T has virtual functions and accessible"
5247 " non-virtual destructor", t);
5252 if (warn_overloaded_virtual)
5255 /* Class layout, assignment of virtual table slots, etc., is now
5256 complete. Give the back end a chance to tweak the visibility of
5257 the class or perform any other required target modifications. */
5258 targetm.cxx.adjust_class_at_definition (t);
5260 maybe_suppress_debug_info (t);
5262 dump_class_hierarchy (t);
5264 /* Finish debugging output for this type. */
5265 rest_of_type_compilation (t, ! LOCAL_CLASS_P (t));
5268 /* When T was built up, the member declarations were added in reverse
5269 order. Rearrange them to declaration order. */
5272 unreverse_member_declarations (tree t)
5278 /* The following lists are all in reverse order. Put them in
5279 declaration order now. */
5280 TYPE_METHODS (t) = nreverse (TYPE_METHODS (t));
5281 CLASSTYPE_DECL_LIST (t) = nreverse (CLASSTYPE_DECL_LIST (t));
5283 /* Actually, for the TYPE_FIELDS, only the non TYPE_DECLs are in
5284 reverse order, so we can't just use nreverse. */
5286 for (x = TYPE_FIELDS (t);
5287 x && TREE_CODE (x) != TYPE_DECL;
5290 next = TREE_CHAIN (x);
5291 TREE_CHAIN (x) = prev;
5296 TREE_CHAIN (TYPE_FIELDS (t)) = x;
5298 TYPE_FIELDS (t) = prev;
5303 finish_struct (tree t, tree attributes)
5305 location_t saved_loc = input_location;
5307 /* Now that we've got all the field declarations, reverse everything
5309 unreverse_member_declarations (t);
5311 cplus_decl_attributes (&t, attributes, (int) ATTR_FLAG_TYPE_IN_PLACE);
5313 /* Nadger the current location so that diagnostics point to the start of
5314 the struct, not the end. */
5315 input_location = DECL_SOURCE_LOCATION (TYPE_NAME (t));
5317 if (processing_template_decl)
5321 finish_struct_methods (t);
5322 TYPE_SIZE (t) = bitsize_zero_node;
5323 TYPE_SIZE_UNIT (t) = size_zero_node;
5325 /* We need to emit an error message if this type was used as a parameter
5326 and it is an abstract type, even if it is a template. We construct
5327 a simple CLASSTYPE_PURE_VIRTUALS list without taking bases into
5328 account and we call complete_vars with this type, which will check
5329 the PARM_DECLS. Note that while the type is being defined,
5330 CLASSTYPE_PURE_VIRTUALS contains the list of the inline friends
5331 (see CLASSTYPE_INLINE_FRIENDS) so we need to clear it. */
5332 CLASSTYPE_PURE_VIRTUALS (t) = NULL;
5333 for (x = TYPE_METHODS (t); x; x = TREE_CHAIN (x))
5334 if (DECL_PURE_VIRTUAL_P (x))
5335 VEC_safe_push (tree, gc, CLASSTYPE_PURE_VIRTUALS (t), x);
5339 finish_struct_1 (t);
5341 input_location = saved_loc;
5343 TYPE_BEING_DEFINED (t) = 0;
5345 if (current_class_type)
5348 error ("trying to finish struct, but kicked out due to previous parse errors");
5350 if (processing_template_decl && at_function_scope_p ())
5351 add_stmt (build_min (TAG_DEFN, t));
5356 /* Return the dynamic type of INSTANCE, if known.
5357 Used to determine whether the virtual function table is needed
5360 *NONNULL is set iff INSTANCE can be known to be nonnull, regardless
5361 of our knowledge of its type. *NONNULL should be initialized
5362 before this function is called. */
5365 fixed_type_or_null (tree instance, int *nonnull, int *cdtorp)
5367 #define RECUR(T) fixed_type_or_null((T), nonnull, cdtorp)
5369 switch (TREE_CODE (instance))
5372 if (POINTER_TYPE_P (TREE_TYPE (instance)))
5375 return RECUR (TREE_OPERAND (instance, 0));
5378 /* This is a call to a constructor, hence it's never zero. */
5379 if (TREE_HAS_CONSTRUCTOR (instance))
5383 return TREE_TYPE (instance);
5388 /* This is a call to a constructor, hence it's never zero. */
5389 if (TREE_HAS_CONSTRUCTOR (instance))
5393 return TREE_TYPE (instance);
5395 return RECUR (TREE_OPERAND (instance, 0));
5397 case POINTER_PLUS_EXPR:
5400 if (TREE_CODE (TREE_OPERAND (instance, 0)) == ADDR_EXPR)
5401 return RECUR (TREE_OPERAND (instance, 0));
5402 if (TREE_CODE (TREE_OPERAND (instance, 1)) == INTEGER_CST)
5403 /* Propagate nonnull. */
5404 return RECUR (TREE_OPERAND (instance, 0));
5410 return RECUR (TREE_OPERAND (instance, 0));
5413 instance = TREE_OPERAND (instance, 0);
5416 /* Just because we see an ADDR_EXPR doesn't mean we're dealing
5417 with a real object -- given &p->f, p can still be null. */
5418 tree t = get_base_address (instance);
5419 /* ??? Probably should check DECL_WEAK here. */
5420 if (t && DECL_P (t))
5423 return RECUR (instance);
5426 /* If this component is really a base class reference, then the field
5427 itself isn't definitive. */
5428 if (DECL_FIELD_IS_BASE (TREE_OPERAND (instance, 1)))
5429 return RECUR (TREE_OPERAND (instance, 0));
5430 return RECUR (TREE_OPERAND (instance, 1));
5434 if (TREE_CODE (TREE_TYPE (instance)) == ARRAY_TYPE
5435 && IS_AGGR_TYPE (TREE_TYPE (TREE_TYPE (instance))))
5439 return TREE_TYPE (TREE_TYPE (instance));
5441 /* fall through... */
5445 if (IS_AGGR_TYPE (TREE_TYPE (instance)))
5449 return TREE_TYPE (instance);
5451 else if (instance == current_class_ptr)
5456 /* if we're in a ctor or dtor, we know our type. */
5457 if (DECL_LANG_SPECIFIC (current_function_decl)
5458 && (DECL_CONSTRUCTOR_P (current_function_decl)
5459 || DECL_DESTRUCTOR_P (current_function_decl)))
5463 return TREE_TYPE (TREE_TYPE (instance));
5466 else if (TREE_CODE (TREE_TYPE (instance)) == REFERENCE_TYPE)
5468 /* We only need one hash table because it is always left empty. */
5471 ht = htab_create (37,
5476 /* Reference variables should be references to objects. */
5480 /* Enter the INSTANCE in a table to prevent recursion; a
5481 variable's initializer may refer to the variable
5483 if (TREE_CODE (instance) == VAR_DECL
5484 && DECL_INITIAL (instance)
5485 && !htab_find (ht, instance))
5490 slot = htab_find_slot (ht, instance, INSERT);
5492 type = RECUR (DECL_INITIAL (instance));
5493 htab_remove_elt (ht, instance);
5506 /* Return nonzero if the dynamic type of INSTANCE is known, and
5507 equivalent to the static type. We also handle the case where
5508 INSTANCE is really a pointer. Return negative if this is a
5509 ctor/dtor. There the dynamic type is known, but this might not be
5510 the most derived base of the original object, and hence virtual
5511 bases may not be layed out according to this type.
5513 Used to determine whether the virtual function table is needed
5516 *NONNULL is set iff INSTANCE can be known to be nonnull, regardless
5517 of our knowledge of its type. *NONNULL should be initialized
5518 before this function is called. */
5521 resolves_to_fixed_type_p (tree instance, int* nonnull)
5523 tree t = TREE_TYPE (instance);
5525 tree fixed = fixed_type_or_null (instance, nonnull, &cdtorp);
5526 if (fixed == NULL_TREE)
5528 if (POINTER_TYPE_P (t))
5530 if (!same_type_ignoring_top_level_qualifiers_p (t, fixed))
5532 return cdtorp ? -1 : 1;
5537 init_class_processing (void)
5539 current_class_depth = 0;
5540 current_class_stack_size = 10;
5542 = XNEWVEC (struct class_stack_node, current_class_stack_size);
5543 local_classes = VEC_alloc (tree, gc, 8);
5544 sizeof_biggest_empty_class = size_zero_node;
5546 ridpointers[(int) RID_PUBLIC] = access_public_node;
5547 ridpointers[(int) RID_PRIVATE] = access_private_node;
5548 ridpointers[(int) RID_PROTECTED] = access_protected_node;
5551 /* Restore the cached PREVIOUS_CLASS_LEVEL. */
5554 restore_class_cache (void)
5558 /* We are re-entering the same class we just left, so we don't
5559 have to search the whole inheritance matrix to find all the
5560 decls to bind again. Instead, we install the cached
5561 class_shadowed list and walk through it binding names. */
5562 push_binding_level (previous_class_level);
5563 class_binding_level = previous_class_level;
5564 /* Restore IDENTIFIER_TYPE_VALUE. */
5565 for (type = class_binding_level->type_shadowed;
5567 type = TREE_CHAIN (type))
5568 SET_IDENTIFIER_TYPE_VALUE (TREE_PURPOSE (type), TREE_TYPE (type));
5571 /* Set global variables CURRENT_CLASS_NAME and CURRENT_CLASS_TYPE as
5572 appropriate for TYPE.
5574 So that we may avoid calls to lookup_name, we cache the _TYPE
5575 nodes of local TYPE_DECLs in the TREE_TYPE field of the name.
5577 For multiple inheritance, we perform a two-pass depth-first search
5578 of the type lattice. */
5581 pushclass (tree type)
5583 class_stack_node_t csn;
5585 type = TYPE_MAIN_VARIANT (type);
5587 /* Make sure there is enough room for the new entry on the stack. */
5588 if (current_class_depth + 1 >= current_class_stack_size)
5590 current_class_stack_size *= 2;
5592 = XRESIZEVEC (struct class_stack_node, current_class_stack,
5593 current_class_stack_size);
5596 /* Insert a new entry on the class stack. */
5597 csn = current_class_stack + current_class_depth;
5598 csn->name = current_class_name;
5599 csn->type = current_class_type;
5600 csn->access = current_access_specifier;
5601 csn->names_used = 0;
5603 current_class_depth++;
5605 /* Now set up the new type. */
5606 current_class_name = TYPE_NAME (type);
5607 if (TREE_CODE (current_class_name) == TYPE_DECL)
5608 current_class_name = DECL_NAME (current_class_name);
5609 current_class_type = type;
5611 /* By default, things in classes are private, while things in
5612 structures or unions are public. */
5613 current_access_specifier = (CLASSTYPE_DECLARED_CLASS (type)
5614 ? access_private_node
5615 : access_public_node);
5617 if (previous_class_level
5618 && type != previous_class_level->this_entity
5619 && current_class_depth == 1)
5621 /* Forcibly remove any old class remnants. */
5622 invalidate_class_lookup_cache ();
5625 if (!previous_class_level
5626 || type != previous_class_level->this_entity
5627 || current_class_depth > 1)
5630 restore_class_cache ();
5633 /* When we exit a toplevel class scope, we save its binding level so
5634 that we can restore it quickly. Here, we've entered some other
5635 class, so we must invalidate our cache. */
5638 invalidate_class_lookup_cache (void)
5640 previous_class_level = NULL;
5643 /* Get out of the current class scope. If we were in a class scope
5644 previously, that is the one popped to. */
5651 current_class_depth--;
5652 current_class_name = current_class_stack[current_class_depth].name;
5653 current_class_type = current_class_stack[current_class_depth].type;
5654 current_access_specifier = current_class_stack[current_class_depth].access;
5655 if (current_class_stack[current_class_depth].names_used)
5656 splay_tree_delete (current_class_stack[current_class_depth].names_used);
5659 /* Mark the top of the class stack as hidden. */
5662 push_class_stack (void)
5664 if (current_class_depth)
5665 ++current_class_stack[current_class_depth - 1].hidden;
5668 /* Mark the top of the class stack as un-hidden. */
5671 pop_class_stack (void)
5673 if (current_class_depth)
5674 --current_class_stack[current_class_depth - 1].hidden;
5677 /* Returns 1 if the class type currently being defined is either T or
5678 a nested type of T. */
5681 currently_open_class (tree t)
5685 /* We start looking from 1 because entry 0 is from global scope,
5687 for (i = current_class_depth; i > 0; --i)
5690 if (i == current_class_depth)
5691 c = current_class_type;
5694 if (current_class_stack[i].hidden)
5696 c = current_class_stack[i].type;
5700 if (same_type_p (c, t))
5706 /* If either current_class_type or one of its enclosing classes are derived
5707 from T, return the appropriate type. Used to determine how we found
5708 something via unqualified lookup. */
5711 currently_open_derived_class (tree t)
5715 /* The bases of a dependent type are unknown. */
5716 if (dependent_type_p (t))
5719 if (!current_class_type)
5722 if (DERIVED_FROM_P (t, current_class_type))
5723 return current_class_type;
5725 for (i = current_class_depth - 1; i > 0; --i)
5727 if (current_class_stack[i].hidden)
5729 if (DERIVED_FROM_P (t, current_class_stack[i].type))
5730 return current_class_stack[i].type;
5736 /* When entering a class scope, all enclosing class scopes' names with
5737 static meaning (static variables, static functions, types and
5738 enumerators) have to be visible. This recursive function calls
5739 pushclass for all enclosing class contexts until global or a local
5740 scope is reached. TYPE is the enclosed class. */
5743 push_nested_class (tree type)
5745 /* A namespace might be passed in error cases, like A::B:C. */
5746 if (type == NULL_TREE
5747 || !CLASS_TYPE_P (type))
5750 push_nested_class (DECL_CONTEXT (TYPE_MAIN_DECL (type)));
5755 /* Undoes a push_nested_class call. */
5758 pop_nested_class (void)
5760 tree context = DECL_CONTEXT (TYPE_MAIN_DECL (current_class_type));
5763 if (context && CLASS_TYPE_P (context))
5764 pop_nested_class ();
5767 /* Returns the number of extern "LANG" blocks we are nested within. */
5770 current_lang_depth (void)
5772 return VEC_length (tree, current_lang_base);
5775 /* Set global variables CURRENT_LANG_NAME to appropriate value
5776 so that behavior of name-mangling machinery is correct. */
5779 push_lang_context (tree name)
5781 VEC_safe_push (tree, gc, current_lang_base, current_lang_name);
5783 if (name == lang_name_cplusplus)
5785 current_lang_name = name;
5787 else if (name == lang_name_java)
5789 current_lang_name = name;
5790 /* DECL_IGNORED_P is initially set for these types, to avoid clutter.
5791 (See record_builtin_java_type in decl.c.) However, that causes
5792 incorrect debug entries if these types are actually used.
5793 So we re-enable debug output after extern "Java". */
5794 DECL_IGNORED_P (TYPE_NAME (java_byte_type_node)) = 0;
5795 DECL_IGNORED_P (TYPE_NAME (java_short_type_node)) = 0;
5796 DECL_IGNORED_P (TYPE_NAME (java_int_type_node)) = 0;
5797 DECL_IGNORED_P (TYPE_NAME (java_long_type_node)) = 0;
5798 DECL_IGNORED_P (TYPE_NAME (java_float_type_node)) = 0;
5799 DECL_IGNORED_P (TYPE_NAME (java_double_type_node)) = 0;
5800 DECL_IGNORED_P (TYPE_NAME (java_char_type_node)) = 0;
5801 DECL_IGNORED_P (TYPE_NAME (java_boolean_type_node)) = 0;
5803 else if (name == lang_name_c)
5805 current_lang_name = name;
5808 error ("language string %<\"%E\"%> not recognized", name);
5811 /* Get out of the current language scope. */
5814 pop_lang_context (void)
5816 current_lang_name = VEC_pop (tree, current_lang_base);
5819 /* Type instantiation routines. */
5821 /* Given an OVERLOAD and a TARGET_TYPE, return the function that
5822 matches the TARGET_TYPE. If there is no satisfactory match, return
5823 error_mark_node, and issue an error & warning messages under
5824 control of FLAGS. Permit pointers to member function if FLAGS
5825 permits. If TEMPLATE_ONLY, the name of the overloaded function was
5826 a template-id, and EXPLICIT_TARGS are the explicitly provided
5827 template arguments. If OVERLOAD is for one or more member
5828 functions, then ACCESS_PATH is the base path used to reference
5829 those member functions. */
5832 resolve_address_of_overloaded_function (tree target_type,
5834 tsubst_flags_t flags,
5836 tree explicit_targs,
5839 /* Here's what the standard says:
5843 If the name is a function template, template argument deduction
5844 is done, and if the argument deduction succeeds, the deduced
5845 arguments are used to generate a single template function, which
5846 is added to the set of overloaded functions considered.
5848 Non-member functions and static member functions match targets of
5849 type "pointer-to-function" or "reference-to-function." Nonstatic
5850 member functions match targets of type "pointer-to-member
5851 function;" the function type of the pointer to member is used to
5852 select the member function from the set of overloaded member
5853 functions. If a nonstatic member function is selected, the
5854 reference to the overloaded function name is required to have the
5855 form of a pointer to member as described in 5.3.1.
5857 If more than one function is selected, any template functions in
5858 the set are eliminated if the set also contains a non-template
5859 function, and any given template function is eliminated if the
5860 set contains a second template function that is more specialized
5861 than the first according to the partial ordering rules 14.5.5.2.
5862 After such eliminations, if any, there shall remain exactly one
5863 selected function. */
5866 int is_reference = 0;
5867 /* We store the matches in a TREE_LIST rooted here. The functions
5868 are the TREE_PURPOSE, not the TREE_VALUE, in this list, for easy
5869 interoperability with most_specialized_instantiation. */
5870 tree matches = NULL_TREE;
5873 /* By the time we get here, we should be seeing only real
5874 pointer-to-member types, not the internal POINTER_TYPE to
5875 METHOD_TYPE representation. */
5876 gcc_assert (TREE_CODE (target_type) != POINTER_TYPE
5877 || TREE_CODE (TREE_TYPE (target_type)) != METHOD_TYPE);
5879 gcc_assert (is_overloaded_fn (overload));
5881 /* Check that the TARGET_TYPE is reasonable. */
5882 if (TYPE_PTRFN_P (target_type))
5884 else if (TYPE_PTRMEMFUNC_P (target_type))
5885 /* This is OK, too. */
5887 else if (TREE_CODE (target_type) == FUNCTION_TYPE)
5889 /* This is OK, too. This comes from a conversion to reference
5891 target_type = build_reference_type (target_type);
5896 if (flags & tf_error)
5897 error ("cannot resolve overloaded function %qD based on"
5898 " conversion to type %qT",
5899 DECL_NAME (OVL_FUNCTION (overload)), target_type);
5900 return error_mark_node;
5903 /* If we can find a non-template function that matches, we can just
5904 use it. There's no point in generating template instantiations
5905 if we're just going to throw them out anyhow. But, of course, we
5906 can only do this when we don't *need* a template function. */
5911 for (fns = overload; fns; fns = OVL_NEXT (fns))
5913 tree fn = OVL_CURRENT (fns);
5916 if (TREE_CODE (fn) == TEMPLATE_DECL)
5917 /* We're not looking for templates just yet. */
5920 if ((TREE_CODE (TREE_TYPE (fn)) == METHOD_TYPE)
5922 /* We're looking for a non-static member, and this isn't
5923 one, or vice versa. */
5926 /* Ignore functions which haven't been explicitly
5928 if (DECL_ANTICIPATED (fn))
5931 /* See if there's a match. */
5932 fntype = TREE_TYPE (fn);
5934 fntype = build_ptrmemfunc_type (build_pointer_type (fntype));
5935 else if (!is_reference)
5936 fntype = build_pointer_type (fntype);
5938 if (can_convert_arg (target_type, fntype, fn, LOOKUP_NORMAL))
5939 matches = tree_cons (fn, NULL_TREE, matches);
5943 /* Now, if we've already got a match (or matches), there's no need
5944 to proceed to the template functions. But, if we don't have a
5945 match we need to look at them, too. */
5948 tree target_fn_type;
5949 tree target_arg_types;
5950 tree target_ret_type;
5955 = TREE_TYPE (TYPE_PTRMEMFUNC_FN_TYPE (target_type));
5957 target_fn_type = TREE_TYPE (target_type);
5958 target_arg_types = TYPE_ARG_TYPES (target_fn_type);
5959 target_ret_type = TREE_TYPE (target_fn_type);
5961 /* Never do unification on the 'this' parameter. */
5962 if (TREE_CODE (target_fn_type) == METHOD_TYPE)
5963 target_arg_types = TREE_CHAIN (target_arg_types);
5965 for (fns = overload; fns; fns = OVL_NEXT (fns))
5967 tree fn = OVL_CURRENT (fns);
5969 tree instantiation_type;
5972 if (TREE_CODE (fn) != TEMPLATE_DECL)
5973 /* We're only looking for templates. */
5976 if ((TREE_CODE (TREE_TYPE (fn)) == METHOD_TYPE)
5978 /* We're not looking for a non-static member, and this is
5979 one, or vice versa. */
5982 /* Try to do argument deduction. */
5983 targs = make_tree_vec (DECL_NTPARMS (fn));
5984 if (fn_type_unification (fn, explicit_targs, targs,
5985 target_arg_types, target_ret_type,
5986 DEDUCE_EXACT, LOOKUP_NORMAL))
5987 /* Argument deduction failed. */
5990 /* Instantiate the template. */
5991 instantiation = instantiate_template (fn, targs, flags);
5992 if (instantiation == error_mark_node)
5993 /* Instantiation failed. */
5996 /* See if there's a match. */
5997 instantiation_type = TREE_TYPE (instantiation);
5999 instantiation_type =
6000 build_ptrmemfunc_type (build_pointer_type (instantiation_type));
6001 else if (!is_reference)
6002 instantiation_type = build_pointer_type (instantiation_type);
6003 if (can_convert_arg (target_type, instantiation_type, instantiation,
6005 matches = tree_cons (instantiation, fn, matches);
6008 /* Now, remove all but the most specialized of the matches. */
6011 tree match = most_specialized_instantiation (matches);
6013 if (match != error_mark_node)
6014 matches = tree_cons (TREE_PURPOSE (match),
6020 /* Now we should have exactly one function in MATCHES. */
6021 if (matches == NULL_TREE)
6023 /* There were *no* matches. */
6024 if (flags & tf_error)
6026 error ("no matches converting function %qD to type %q#T",
6027 DECL_NAME (OVL_FUNCTION (overload)),
6030 /* print_candidates expects a chain with the functions in
6031 TREE_VALUE slots, so we cons one up here (we're losing anyway,
6032 so why be clever?). */
6033 for (; overload; overload = OVL_NEXT (overload))
6034 matches = tree_cons (NULL_TREE, OVL_CURRENT (overload),
6037 print_candidates (matches);
6039 return error_mark_node;
6041 else if (TREE_CHAIN (matches))
6043 /* There were too many matches. */
6045 if (flags & tf_error)
6049 error ("converting overloaded function %qD to type %q#T is ambiguous",
6050 DECL_NAME (OVL_FUNCTION (overload)),
6053 /* Since print_candidates expects the functions in the
6054 TREE_VALUE slot, we flip them here. */
6055 for (match = matches; match; match = TREE_CHAIN (match))
6056 TREE_VALUE (match) = TREE_PURPOSE (match);
6058 print_candidates (matches);
6061 return error_mark_node;
6064 /* Good, exactly one match. Now, convert it to the correct type. */
6065 fn = TREE_PURPOSE (matches);
6067 if (DECL_NONSTATIC_MEMBER_FUNCTION_P (fn)
6068 && !(flags & tf_ptrmem_ok) && !flag_ms_extensions)
6070 static int explained;
6072 if (!(flags & tf_error))
6073 return error_mark_node;
6075 pedwarn ("assuming pointer to member %qD", fn);
6078 pedwarn ("(a pointer to member can only be formed with %<&%E%>)", fn);
6083 /* If we're doing overload resolution purely for the purpose of
6084 determining conversion sequences, we should not consider the
6085 function used. If this conversion sequence is selected, the
6086 function will be marked as used at this point. */
6087 if (!(flags & tf_conv))
6090 /* We could not check access when this expression was originally
6091 created since we did not know at that time to which function
6092 the expression referred. */
6093 if (DECL_FUNCTION_MEMBER_P (fn))
6095 gcc_assert (access_path);
6096 perform_or_defer_access_check (access_path, fn, fn);
6100 if (TYPE_PTRFN_P (target_type) || TYPE_PTRMEMFUNC_P (target_type))
6101 return build_unary_op (ADDR_EXPR, fn, 0);
6104 /* The target must be a REFERENCE_TYPE. Above, build_unary_op
6105 will mark the function as addressed, but here we must do it
6107 cxx_mark_addressable (fn);
6113 /* This function will instantiate the type of the expression given in
6114 RHS to match the type of LHSTYPE. If errors exist, then return
6115 error_mark_node. FLAGS is a bit mask. If TF_ERROR is set, then
6116 we complain on errors. If we are not complaining, never modify rhs,
6117 as overload resolution wants to try many possible instantiations, in
6118 the hope that at least one will work.
6120 For non-recursive calls, LHSTYPE should be a function, pointer to
6121 function, or a pointer to member function. */
6124 instantiate_type (tree lhstype, tree rhs, tsubst_flags_t flags)
6126 tsubst_flags_t flags_in = flags;
6127 tree access_path = NULL_TREE;
6129 flags &= ~tf_ptrmem_ok;
6131 if (TREE_CODE (lhstype) == UNKNOWN_TYPE)
6133 if (flags & tf_error)
6134 error ("not enough type information");
6135 return error_mark_node;
6138 if (TREE_TYPE (rhs) != NULL_TREE && ! (type_unknown_p (rhs)))
6140 if (same_type_p (lhstype, TREE_TYPE (rhs)))
6142 if (flag_ms_extensions
6143 && TYPE_PTRMEMFUNC_P (lhstype)
6144 && !TYPE_PTRMEMFUNC_P (TREE_TYPE (rhs)))
6145 /* Microsoft allows `A::f' to be resolved to a
6146 pointer-to-member. */
6150 if (flags & tf_error)
6151 error ("argument of type %qT does not match %qT",
6152 TREE_TYPE (rhs), lhstype);
6153 return error_mark_node;
6157 if (TREE_CODE (rhs) == BASELINK)
6159 access_path = BASELINK_ACCESS_BINFO (rhs);
6160 rhs = BASELINK_FUNCTIONS (rhs);
6163 /* If we are in a template, and have a NON_DEPENDENT_EXPR, we cannot
6164 deduce any type information. */
6165 if (TREE_CODE (rhs) == NON_DEPENDENT_EXPR)
6167 if (flags & tf_error)
6168 error ("not enough type information");
6169 return error_mark_node;
6172 /* There only a few kinds of expressions that may have a type
6173 dependent on overload resolution. */
6174 gcc_assert (TREE_CODE (rhs) == ADDR_EXPR
6175 || TREE_CODE (rhs) == COMPONENT_REF
6176 || TREE_CODE (rhs) == COMPOUND_EXPR
6177 || really_overloaded_fn (rhs));
6179 /* We don't overwrite rhs if it is an overloaded function.
6180 Copying it would destroy the tree link. */
6181 if (TREE_CODE (rhs) != OVERLOAD)
6182 rhs = copy_node (rhs);
6184 /* This should really only be used when attempting to distinguish
6185 what sort of a pointer to function we have. For now, any
6186 arithmetic operation which is not supported on pointers
6187 is rejected as an error. */
6189 switch (TREE_CODE (rhs))
6193 tree member = TREE_OPERAND (rhs, 1);
6195 member = instantiate_type (lhstype, member, flags);
6196 if (member != error_mark_node
6197 && TREE_SIDE_EFFECTS (TREE_OPERAND (rhs, 0)))
6198 /* Do not lose object's side effects. */
6199 return build2 (COMPOUND_EXPR, TREE_TYPE (member),
6200 TREE_OPERAND (rhs, 0), member);
6205 rhs = TREE_OPERAND (rhs, 1);
6206 if (BASELINK_P (rhs))
6207 return instantiate_type (lhstype, rhs, flags_in);
6209 /* This can happen if we are forming a pointer-to-member for a
6211 gcc_assert (TREE_CODE (rhs) == TEMPLATE_ID_EXPR);
6215 case TEMPLATE_ID_EXPR:
6217 tree fns = TREE_OPERAND (rhs, 0);
6218 tree args = TREE_OPERAND (rhs, 1);
6221 resolve_address_of_overloaded_function (lhstype, fns, flags_in,
6222 /*template_only=*/true,
6229 resolve_address_of_overloaded_function (lhstype, rhs, flags_in,
6230 /*template_only=*/false,
6231 /*explicit_targs=*/NULL_TREE,
6235 TREE_OPERAND (rhs, 0)
6236 = instantiate_type (lhstype, TREE_OPERAND (rhs, 0), flags);
6237 if (TREE_OPERAND (rhs, 0) == error_mark_node)
6238 return error_mark_node;
6239 TREE_OPERAND (rhs, 1)
6240 = instantiate_type (lhstype, TREE_OPERAND (rhs, 1), flags);
6241 if (TREE_OPERAND (rhs, 1) == error_mark_node)
6242 return error_mark_node;
6244 TREE_TYPE (rhs) = lhstype;
6249 if (PTRMEM_OK_P (rhs))
6250 flags |= tf_ptrmem_ok;
6252 return instantiate_type (lhstype, TREE_OPERAND (rhs, 0), flags);
6256 return error_mark_node;
6261 return error_mark_node;
6264 /* Return the name of the virtual function pointer field
6265 (as an IDENTIFIER_NODE) for the given TYPE. Note that
6266 this may have to look back through base types to find the
6267 ultimate field name. (For single inheritance, these could
6268 all be the same name. Who knows for multiple inheritance). */
6271 get_vfield_name (tree type)
6273 tree binfo, base_binfo;
6276 for (binfo = TYPE_BINFO (type);
6277 BINFO_N_BASE_BINFOS (binfo);
6280 base_binfo = BINFO_BASE_BINFO (binfo, 0);
6282 if (BINFO_VIRTUAL_P (base_binfo)
6283 || !TYPE_CONTAINS_VPTR_P (BINFO_TYPE (base_binfo)))
6287 type = BINFO_TYPE (binfo);
6288 buf = (char *) alloca (sizeof (VFIELD_NAME_FORMAT)
6289 + TYPE_NAME_LENGTH (type) + 2);
6290 sprintf (buf, VFIELD_NAME_FORMAT,
6291 IDENTIFIER_POINTER (constructor_name (type)));
6292 return get_identifier (buf);
6296 print_class_statistics (void)
6298 #ifdef GATHER_STATISTICS
6299 fprintf (stderr, "convert_harshness = %d\n", n_convert_harshness);
6300 fprintf (stderr, "compute_conversion_costs = %d\n", n_compute_conversion_costs);
6303 fprintf (stderr, "vtables = %d; vtable searches = %d\n",
6304 n_vtables, n_vtable_searches);
6305 fprintf (stderr, "vtable entries = %d; vtable elems = %d\n",
6306 n_vtable_entries, n_vtable_elems);
6311 /* Build a dummy reference to ourselves so Derived::Base (and A::A) works,
6312 according to [class]:
6313 The class-name is also inserted
6314 into the scope of the class itself. For purposes of access checking,
6315 the inserted class name is treated as if it were a public member name. */
6318 build_self_reference (void)
6320 tree name = constructor_name (current_class_type);
6321 tree value = build_lang_decl (TYPE_DECL, name, current_class_type);
6324 DECL_NONLOCAL (value) = 1;
6325 DECL_CONTEXT (value) = current_class_type;
6326 DECL_ARTIFICIAL (value) = 1;
6327 SET_DECL_SELF_REFERENCE_P (value);
6329 if (processing_template_decl)
6330 value = push_template_decl (value);
6332 saved_cas = current_access_specifier;
6333 current_access_specifier = access_public_node;
6334 finish_member_declaration (value);
6335 current_access_specifier = saved_cas;
6338 /* Returns 1 if TYPE contains only padding bytes. */
6341 is_empty_class (tree type)
6343 if (type == error_mark_node)
6346 if (! IS_AGGR_TYPE (type))
6349 /* In G++ 3.2, whether or not a class was empty was determined by
6350 looking at its size. */
6351 if (abi_version_at_least (2))
6352 return CLASSTYPE_EMPTY_P (type);
6354 return integer_zerop (CLASSTYPE_SIZE (type));
6357 /* Returns true if TYPE contains an empty class. */
6360 contains_empty_class_p (tree type)
6362 if (is_empty_class (type))
6364 if (CLASS_TYPE_P (type))
6371 for (binfo = TYPE_BINFO (type), i = 0;
6372 BINFO_BASE_ITERATE (binfo, i, base_binfo); ++i)
6373 if (contains_empty_class_p (BINFO_TYPE (base_binfo)))
6375 for (field = TYPE_FIELDS (type); field; field = TREE_CHAIN (field))
6376 if (TREE_CODE (field) == FIELD_DECL
6377 && !DECL_ARTIFICIAL (field)
6378 && is_empty_class (TREE_TYPE (field)))
6381 else if (TREE_CODE (type) == ARRAY_TYPE)
6382 return contains_empty_class_p (TREE_TYPE (type));
6386 /* Note that NAME was looked up while the current class was being
6387 defined and that the result of that lookup was DECL. */
6390 maybe_note_name_used_in_class (tree name, tree decl)
6392 splay_tree names_used;
6394 /* If we're not defining a class, there's nothing to do. */
6395 if (!(innermost_scope_kind() == sk_class
6396 && TYPE_BEING_DEFINED (current_class_type)))
6399 /* If there's already a binding for this NAME, then we don't have
6400 anything to worry about. */
6401 if (lookup_member (current_class_type, name,
6402 /*protect=*/0, /*want_type=*/false))
6405 if (!current_class_stack[current_class_depth - 1].names_used)
6406 current_class_stack[current_class_depth - 1].names_used
6407 = splay_tree_new (splay_tree_compare_pointers, 0, 0);
6408 names_used = current_class_stack[current_class_depth - 1].names_used;
6410 splay_tree_insert (names_used,
6411 (splay_tree_key) name,
6412 (splay_tree_value) decl);
6415 /* Note that NAME was declared (as DECL) in the current class. Check
6416 to see that the declaration is valid. */
6419 note_name_declared_in_class (tree name, tree decl)
6421 splay_tree names_used;
6424 /* Look to see if we ever used this name. */
6426 = current_class_stack[current_class_depth - 1].names_used;
6430 n = splay_tree_lookup (names_used, (splay_tree_key) name);
6433 /* [basic.scope.class]
6435 A name N used in a class S shall refer to the same declaration
6436 in its context and when re-evaluated in the completed scope of
6438 pedwarn ("declaration of %q#D", decl);
6439 pedwarn ("changes meaning of %qD from %q+#D",
6440 DECL_NAME (OVL_CURRENT (decl)), (tree) n->value);
6444 /* Returns the VAR_DECL for the complete vtable associated with BINFO.
6445 Secondary vtables are merged with primary vtables; this function
6446 will return the VAR_DECL for the primary vtable. */
6449 get_vtbl_decl_for_binfo (tree binfo)
6453 decl = BINFO_VTABLE (binfo);
6454 if (decl && TREE_CODE (decl) == POINTER_PLUS_EXPR)
6456 gcc_assert (TREE_CODE (TREE_OPERAND (decl, 0)) == ADDR_EXPR);
6457 decl = TREE_OPERAND (TREE_OPERAND (decl, 0), 0);
6460 gcc_assert (TREE_CODE (decl) == VAR_DECL);
6465 /* Returns the binfo for the primary base of BINFO. If the resulting
6466 BINFO is a virtual base, and it is inherited elsewhere in the
6467 hierarchy, then the returned binfo might not be the primary base of
6468 BINFO in the complete object. Check BINFO_PRIMARY_P or
6469 BINFO_LOST_PRIMARY_P to be sure. */
6472 get_primary_binfo (tree binfo)
6476 primary_base = CLASSTYPE_PRIMARY_BINFO (BINFO_TYPE (binfo));
6480 return copied_binfo (primary_base, binfo);
6483 /* If INDENTED_P is zero, indent to INDENT. Return nonzero. */
6486 maybe_indent_hierarchy (FILE * stream, int indent, int indented_p)
6489 fprintf (stream, "%*s", indent, "");
6493 /* Dump the offsets of all the bases rooted at BINFO to STREAM.
6494 INDENT should be zero when called from the top level; it is
6495 incremented recursively. IGO indicates the next expected BINFO in
6496 inheritance graph ordering. */
6499 dump_class_hierarchy_r (FILE *stream,
6509 indented = maybe_indent_hierarchy (stream, indent, 0);
6510 fprintf (stream, "%s (0x%lx) ",
6511 type_as_string (BINFO_TYPE (binfo), TFF_PLAIN_IDENTIFIER),
6512 (unsigned long) binfo);
6515 fprintf (stream, "alternative-path\n");
6518 igo = TREE_CHAIN (binfo);
6520 fprintf (stream, HOST_WIDE_INT_PRINT_DEC,
6521 tree_low_cst (BINFO_OFFSET (binfo), 0));
6522 if (is_empty_class (BINFO_TYPE (binfo)))
6523 fprintf (stream, " empty");
6524 else if (CLASSTYPE_NEARLY_EMPTY_P (BINFO_TYPE (binfo)))
6525 fprintf (stream, " nearly-empty");
6526 if (BINFO_VIRTUAL_P (binfo))
6527 fprintf (stream, " virtual");
6528 fprintf (stream, "\n");
6531 if (BINFO_PRIMARY_P (binfo))
6533 indented = maybe_indent_hierarchy (stream, indent + 3, indented);
6534 fprintf (stream, " primary-for %s (0x%lx)",
6535 type_as_string (BINFO_TYPE (BINFO_INHERITANCE_CHAIN (binfo)),
6536 TFF_PLAIN_IDENTIFIER),
6537 (unsigned long)BINFO_INHERITANCE_CHAIN (binfo));
6539 if (BINFO_LOST_PRIMARY_P (binfo))
6541 indented = maybe_indent_hierarchy (stream, indent + 3, indented);
6542 fprintf (stream, " lost-primary");
6545 fprintf (stream, "\n");
6547 if (!(flags & TDF_SLIM))
6551 if (BINFO_SUBVTT_INDEX (binfo))
6553 indented = maybe_indent_hierarchy (stream, indent + 3, indented);
6554 fprintf (stream, " subvttidx=%s",
6555 expr_as_string (BINFO_SUBVTT_INDEX (binfo),
6556 TFF_PLAIN_IDENTIFIER));
6558 if (BINFO_VPTR_INDEX (binfo))
6560 indented = maybe_indent_hierarchy (stream, indent + 3, indented);
6561 fprintf (stream, " vptridx=%s",
6562 expr_as_string (BINFO_VPTR_INDEX (binfo),
6563 TFF_PLAIN_IDENTIFIER));
6565 if (BINFO_VPTR_FIELD (binfo))
6567 indented = maybe_indent_hierarchy (stream, indent + 3, indented);
6568 fprintf (stream, " vbaseoffset=%s",
6569 expr_as_string (BINFO_VPTR_FIELD (binfo),
6570 TFF_PLAIN_IDENTIFIER));
6572 if (BINFO_VTABLE (binfo))
6574 indented = maybe_indent_hierarchy (stream, indent + 3, indented);
6575 fprintf (stream, " vptr=%s",
6576 expr_as_string (BINFO_VTABLE (binfo),
6577 TFF_PLAIN_IDENTIFIER));
6581 fprintf (stream, "\n");
6584 for (i = 0; BINFO_BASE_ITERATE (binfo, i, base_binfo); i++)
6585 igo = dump_class_hierarchy_r (stream, flags, base_binfo, igo, indent + 2);
6590 /* Dump the BINFO hierarchy for T. */
6593 dump_class_hierarchy_1 (FILE *stream, int flags, tree t)
6595 fprintf (stream, "Class %s\n", type_as_string (t, TFF_PLAIN_IDENTIFIER));
6596 fprintf (stream, " size=%lu align=%lu\n",
6597 (unsigned long)(tree_low_cst (TYPE_SIZE (t), 0) / BITS_PER_UNIT),
6598 (unsigned long)(TYPE_ALIGN (t) / BITS_PER_UNIT));
6599 fprintf (stream, " base size=%lu base align=%lu\n",
6600 (unsigned long)(tree_low_cst (TYPE_SIZE (CLASSTYPE_AS_BASE (t)), 0)
6602 (unsigned long)(TYPE_ALIGN (CLASSTYPE_AS_BASE (t))
6604 dump_class_hierarchy_r (stream, flags, TYPE_BINFO (t), TYPE_BINFO (t), 0);
6605 fprintf (stream, "\n");
6608 /* Debug interface to hierarchy dumping. */
6611 debug_class (tree t)
6613 dump_class_hierarchy_1 (stderr, TDF_SLIM, t);
6617 dump_class_hierarchy (tree t)
6620 FILE *stream = dump_begin (TDI_class, &flags);
6624 dump_class_hierarchy_1 (stream, flags, t);
6625 dump_end (TDI_class, stream);
6630 dump_array (FILE * stream, tree decl)
6633 unsigned HOST_WIDE_INT ix;
6635 tree size = TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (decl)));
6637 elt = (tree_low_cst (TYPE_SIZE (TREE_TYPE (TREE_TYPE (decl))), 0)
6639 fprintf (stream, "%s:", decl_as_string (decl, TFF_PLAIN_IDENTIFIER));
6640 fprintf (stream, " %s entries",
6641 expr_as_string (size_binop (PLUS_EXPR, size, size_one_node),
6642 TFF_PLAIN_IDENTIFIER));
6643 fprintf (stream, "\n");
6645 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (DECL_INITIAL (decl)),
6647 fprintf (stream, "%-4ld %s\n", (long)(ix * elt),
6648 expr_as_string (value, TFF_PLAIN_IDENTIFIER));
6652 dump_vtable (tree t, tree binfo, tree vtable)
6655 FILE *stream = dump_begin (TDI_class, &flags);
6660 if (!(flags & TDF_SLIM))
6662 int ctor_vtbl_p = TYPE_BINFO (t) != binfo;
6664 fprintf (stream, "%s for %s",
6665 ctor_vtbl_p ? "Construction vtable" : "Vtable",
6666 type_as_string (BINFO_TYPE (binfo), TFF_PLAIN_IDENTIFIER));
6669 if (!BINFO_VIRTUAL_P (binfo))
6670 fprintf (stream, " (0x%lx instance)", (unsigned long)binfo);
6671 fprintf (stream, " in %s", type_as_string (t, TFF_PLAIN_IDENTIFIER));
6673 fprintf (stream, "\n");
6674 dump_array (stream, vtable);
6675 fprintf (stream, "\n");
6678 dump_end (TDI_class, stream);
6682 dump_vtt (tree t, tree vtt)
6685 FILE *stream = dump_begin (TDI_class, &flags);
6690 if (!(flags & TDF_SLIM))
6692 fprintf (stream, "VTT for %s\n",
6693 type_as_string (t, TFF_PLAIN_IDENTIFIER));
6694 dump_array (stream, vtt);
6695 fprintf (stream, "\n");
6698 dump_end (TDI_class, stream);
6701 /* Dump a function or thunk and its thunkees. */
6704 dump_thunk (FILE *stream, int indent, tree thunk)
6706 static const char spaces[] = " ";
6707 tree name = DECL_NAME (thunk);
6710 fprintf (stream, "%.*s%p %s %s", indent, spaces,
6712 !DECL_THUNK_P (thunk) ? "function"
6713 : DECL_THIS_THUNK_P (thunk) ? "this-thunk" : "covariant-thunk",
6714 name ? IDENTIFIER_POINTER (name) : "<unset>");
6715 if (DECL_THUNK_P (thunk))
6717 HOST_WIDE_INT fixed_adjust = THUNK_FIXED_OFFSET (thunk);
6718 tree virtual_adjust = THUNK_VIRTUAL_OFFSET (thunk);
6720 fprintf (stream, " fixed=" HOST_WIDE_INT_PRINT_DEC, fixed_adjust);
6721 if (!virtual_adjust)
6723 else if (DECL_THIS_THUNK_P (thunk))
6724 fprintf (stream, " vcall=" HOST_WIDE_INT_PRINT_DEC,
6725 tree_low_cst (virtual_adjust, 0));
6727 fprintf (stream, " vbase=" HOST_WIDE_INT_PRINT_DEC "(%s)",
6728 tree_low_cst (BINFO_VPTR_FIELD (virtual_adjust), 0),
6729 type_as_string (BINFO_TYPE (virtual_adjust), TFF_SCOPE));
6730 if (THUNK_ALIAS (thunk))
6731 fprintf (stream, " alias to %p", (void *)THUNK_ALIAS (thunk));
6733 fprintf (stream, "\n");
6734 for (thunks = DECL_THUNKS (thunk); thunks; thunks = TREE_CHAIN (thunks))
6735 dump_thunk (stream, indent + 2, thunks);
6738 /* Dump the thunks for FN. */
6741 debug_thunks (tree fn)
6743 dump_thunk (stderr, 0, fn);
6746 /* Virtual function table initialization. */
6748 /* Create all the necessary vtables for T and its base classes. */
6751 finish_vtbls (tree t)
6756 /* We lay out the primary and secondary vtables in one contiguous
6757 vtable. The primary vtable is first, followed by the non-virtual
6758 secondary vtables in inheritance graph order. */
6759 list = build_tree_list (BINFO_VTABLE (TYPE_BINFO (t)), NULL_TREE);
6760 accumulate_vtbl_inits (TYPE_BINFO (t), TYPE_BINFO (t),
6761 TYPE_BINFO (t), t, list);
6763 /* Then come the virtual bases, also in inheritance graph order. */
6764 for (vbase = TYPE_BINFO (t); vbase; vbase = TREE_CHAIN (vbase))
6766 if (!BINFO_VIRTUAL_P (vbase))
6768 accumulate_vtbl_inits (vbase, vbase, TYPE_BINFO (t), t, list);
6771 if (BINFO_VTABLE (TYPE_BINFO (t)))
6772 initialize_vtable (TYPE_BINFO (t), TREE_VALUE (list));
6775 /* Initialize the vtable for BINFO with the INITS. */
6778 initialize_vtable (tree binfo, tree inits)
6782 layout_vtable_decl (binfo, list_length (inits));
6783 decl = get_vtbl_decl_for_binfo (binfo);
6784 initialize_artificial_var (decl, inits);
6785 dump_vtable (BINFO_TYPE (binfo), binfo, decl);
6788 /* Build the VTT (virtual table table) for T.
6789 A class requires a VTT if it has virtual bases.
6792 1 - primary virtual pointer for complete object T
6793 2 - secondary VTTs for each direct non-virtual base of T which requires a
6795 3 - secondary virtual pointers for each direct or indirect base of T which
6796 has virtual bases or is reachable via a virtual path from T.
6797 4 - secondary VTTs for each direct or indirect virtual base of T.
6799 Secondary VTTs look like complete object VTTs without part 4. */
6809 /* Build up the initializers for the VTT. */
6811 index = size_zero_node;
6812 build_vtt_inits (TYPE_BINFO (t), t, &inits, &index);
6814 /* If we didn't need a VTT, we're done. */
6818 /* Figure out the type of the VTT. */
6819 type = build_index_type (size_int (list_length (inits) - 1));
6820 type = build_cplus_array_type (const_ptr_type_node, type);
6822 /* Now, build the VTT object itself. */
6823 vtt = build_vtable (t, mangle_vtt_for_type (t), type);
6824 initialize_artificial_var (vtt, inits);
6825 /* Add the VTT to the vtables list. */
6826 TREE_CHAIN (vtt) = TREE_CHAIN (CLASSTYPE_VTABLES (t));
6827 TREE_CHAIN (CLASSTYPE_VTABLES (t)) = vtt;
6832 /* When building a secondary VTT, BINFO_VTABLE is set to a TREE_LIST with
6833 PURPOSE the RTTI_BINFO, VALUE the real vtable pointer for this binfo,
6834 and CHAIN the vtable pointer for this binfo after construction is
6835 complete. VALUE can also be another BINFO, in which case we recurse. */
6838 binfo_ctor_vtable (tree binfo)
6844 vt = BINFO_VTABLE (binfo);
6845 if (TREE_CODE (vt) == TREE_LIST)
6846 vt = TREE_VALUE (vt);
6847 if (TREE_CODE (vt) == TREE_BINFO)
6856 /* Data for secondary VTT initialization. */
6857 typedef struct secondary_vptr_vtt_init_data_s
6859 /* Is this the primary VTT? */
6862 /* Current index into the VTT. */
6865 /* TREE_LIST of initializers built up. */
6868 /* The type being constructed by this secondary VTT. */
6869 tree type_being_constructed;
6870 } secondary_vptr_vtt_init_data;
6872 /* Recursively build the VTT-initializer for BINFO (which is in the
6873 hierarchy dominated by T). INITS points to the end of the initializer
6874 list to date. INDEX is the VTT index where the next element will be
6875 replaced. Iff BINFO is the binfo for T, this is the top level VTT (i.e.
6876 not a subvtt for some base of T). When that is so, we emit the sub-VTTs
6877 for virtual bases of T. When it is not so, we build the constructor
6878 vtables for the BINFO-in-T variant. */
6881 build_vtt_inits (tree binfo, tree t, tree *inits, tree *index)
6886 tree secondary_vptrs;
6887 secondary_vptr_vtt_init_data data;
6888 int top_level_p = SAME_BINFO_TYPE_P (BINFO_TYPE (binfo), t);
6890 /* We only need VTTs for subobjects with virtual bases. */
6891 if (!CLASSTYPE_VBASECLASSES (BINFO_TYPE (binfo)))
6894 /* We need to use a construction vtable if this is not the primary
6898 build_ctor_vtbl_group (binfo, t);
6900 /* Record the offset in the VTT where this sub-VTT can be found. */
6901 BINFO_SUBVTT_INDEX (binfo) = *index;
6904 /* Add the address of the primary vtable for the complete object. */
6905 init = binfo_ctor_vtable (binfo);
6906 *inits = build_tree_list (NULL_TREE, init);
6907 inits = &TREE_CHAIN (*inits);
6910 gcc_assert (!BINFO_VPTR_INDEX (binfo));
6911 BINFO_VPTR_INDEX (binfo) = *index;
6913 *index = size_binop (PLUS_EXPR, *index, TYPE_SIZE_UNIT (ptr_type_node));
6915 /* Recursively add the secondary VTTs for non-virtual bases. */
6916 for (i = 0; BINFO_BASE_ITERATE (binfo, i, b); ++i)
6917 if (!BINFO_VIRTUAL_P (b))
6918 inits = build_vtt_inits (b, t, inits, index);
6920 /* Add secondary virtual pointers for all subobjects of BINFO with
6921 either virtual bases or reachable along a virtual path, except
6922 subobjects that are non-virtual primary bases. */
6923 data.top_level_p = top_level_p;
6924 data.index = *index;
6926 data.type_being_constructed = BINFO_TYPE (binfo);
6928 dfs_walk_once (binfo, dfs_build_secondary_vptr_vtt_inits, NULL, &data);
6930 *index = data.index;
6932 /* The secondary vptrs come back in reverse order. After we reverse
6933 them, and add the INITS, the last init will be the first element
6935 secondary_vptrs = data.inits;
6936 if (secondary_vptrs)
6938 *inits = nreverse (secondary_vptrs);
6939 inits = &TREE_CHAIN (secondary_vptrs);
6940 gcc_assert (*inits == NULL_TREE);
6944 /* Add the secondary VTTs for virtual bases in inheritance graph
6946 for (b = TYPE_BINFO (BINFO_TYPE (binfo)); b; b = TREE_CHAIN (b))
6948 if (!BINFO_VIRTUAL_P (b))
6951 inits = build_vtt_inits (b, t, inits, index);
6954 /* Remove the ctor vtables we created. */
6955 dfs_walk_all (binfo, dfs_fixup_binfo_vtbls, NULL, binfo);
6960 /* Called from build_vtt_inits via dfs_walk. BINFO is the binfo for the base
6961 in most derived. DATA is a SECONDARY_VPTR_VTT_INIT_DATA structure. */
6964 dfs_build_secondary_vptr_vtt_inits (tree binfo, void *data_)
6966 secondary_vptr_vtt_init_data *data = (secondary_vptr_vtt_init_data *)data_;
6968 /* We don't care about bases that don't have vtables. */
6969 if (!TYPE_VFIELD (BINFO_TYPE (binfo)))
6970 return dfs_skip_bases;
6972 /* We're only interested in proper subobjects of the type being
6974 if (SAME_BINFO_TYPE_P (BINFO_TYPE (binfo), data->type_being_constructed))
6977 /* We're only interested in bases with virtual bases or reachable
6978 via a virtual path from the type being constructed. */
6979 if (!(CLASSTYPE_VBASECLASSES (BINFO_TYPE (binfo))
6980 || binfo_via_virtual (binfo, data->type_being_constructed)))
6981 return dfs_skip_bases;
6983 /* We're not interested in non-virtual primary bases. */
6984 if (!BINFO_VIRTUAL_P (binfo) && BINFO_PRIMARY_P (binfo))
6987 /* Record the index where this secondary vptr can be found. */
6988 if (data->top_level_p)
6990 gcc_assert (!BINFO_VPTR_INDEX (binfo));
6991 BINFO_VPTR_INDEX (binfo) = data->index;
6993 if (BINFO_VIRTUAL_P (binfo))
6995 /* It's a primary virtual base, and this is not a
6996 construction vtable. Find the base this is primary of in
6997 the inheritance graph, and use that base's vtable
6999 while (BINFO_PRIMARY_P (binfo))
7000 binfo = BINFO_INHERITANCE_CHAIN (binfo);
7004 /* Add the initializer for the secondary vptr itself. */
7005 data->inits = tree_cons (NULL_TREE, binfo_ctor_vtable (binfo), data->inits);
7007 /* Advance the vtt index. */
7008 data->index = size_binop (PLUS_EXPR, data->index,
7009 TYPE_SIZE_UNIT (ptr_type_node));
7014 /* Called from build_vtt_inits via dfs_walk. After building
7015 constructor vtables and generating the sub-vtt from them, we need
7016 to restore the BINFO_VTABLES that were scribbled on. DATA is the
7017 binfo of the base whose sub vtt was generated. */
7020 dfs_fixup_binfo_vtbls (tree binfo, void* data)
7022 tree vtable = BINFO_VTABLE (binfo);
7024 if (!TYPE_CONTAINS_VPTR_P (BINFO_TYPE (binfo)))
7025 /* If this class has no vtable, none of its bases do. */
7026 return dfs_skip_bases;
7029 /* This might be a primary base, so have no vtable in this
7033 /* If we scribbled the construction vtable vptr into BINFO, clear it
7035 if (TREE_CODE (vtable) == TREE_LIST
7036 && (TREE_PURPOSE (vtable) == (tree) data))
7037 BINFO_VTABLE (binfo) = TREE_CHAIN (vtable);
7042 /* Build the construction vtable group for BINFO which is in the
7043 hierarchy dominated by T. */
7046 build_ctor_vtbl_group (tree binfo, tree t)
7055 /* See if we've already created this construction vtable group. */
7056 id = mangle_ctor_vtbl_for_type (t, binfo);
7057 if (IDENTIFIER_GLOBAL_VALUE (id))
7060 gcc_assert (!SAME_BINFO_TYPE_P (BINFO_TYPE (binfo), t));
7061 /* Build a version of VTBL (with the wrong type) for use in
7062 constructing the addresses of secondary vtables in the
7063 construction vtable group. */
7064 vtbl = build_vtable (t, id, ptr_type_node);
7065 DECL_CONSTRUCTION_VTABLE_P (vtbl) = 1;
7066 list = build_tree_list (vtbl, NULL_TREE);
7067 accumulate_vtbl_inits (binfo, TYPE_BINFO (TREE_TYPE (binfo)),
7070 /* Add the vtables for each of our virtual bases using the vbase in T
7072 for (vbase = TYPE_BINFO (BINFO_TYPE (binfo));
7074 vbase = TREE_CHAIN (vbase))
7078 if (!BINFO_VIRTUAL_P (vbase))
7080 b = copied_binfo (vbase, binfo);
7082 accumulate_vtbl_inits (b, vbase, binfo, t, list);
7084 inits = TREE_VALUE (list);
7086 /* Figure out the type of the construction vtable. */
7087 type = build_index_type (size_int (list_length (inits) - 1));
7088 type = build_cplus_array_type (vtable_entry_type, type);
7090 TREE_TYPE (vtbl) = type;
7091 DECL_SIZE (vtbl) = DECL_SIZE_UNIT (vtbl) = NULL_TREE;
7092 layout_decl (vtbl, 0);
7094 /* Initialize the construction vtable. */
7095 CLASSTYPE_VTABLES (t) = chainon (CLASSTYPE_VTABLES (t), vtbl);
7096 initialize_artificial_var (vtbl, inits);
7097 dump_vtable (t, binfo, vtbl);
7100 /* Add the vtbl initializers for BINFO (and its bases other than
7101 non-virtual primaries) to the list of INITS. BINFO is in the
7102 hierarchy dominated by T. RTTI_BINFO is the binfo within T of
7103 the constructor the vtbl inits should be accumulated for. (If this
7104 is the complete object vtbl then RTTI_BINFO will be TYPE_BINFO (T).)
7105 ORIG_BINFO is the binfo for this object within BINFO_TYPE (RTTI_BINFO).
7106 BINFO is the active base equivalent of ORIG_BINFO in the inheritance
7107 graph of T. Both BINFO and ORIG_BINFO will have the same BINFO_TYPE,
7108 but are not necessarily the same in terms of layout. */
7111 accumulate_vtbl_inits (tree binfo,
7119 int ctor_vtbl_p = !SAME_BINFO_TYPE_P (BINFO_TYPE (rtti_binfo), t);
7121 gcc_assert (SAME_BINFO_TYPE_P (BINFO_TYPE (binfo), BINFO_TYPE (orig_binfo)));
7123 /* If it doesn't have a vptr, we don't do anything. */
7124 if (!TYPE_CONTAINS_VPTR_P (BINFO_TYPE (binfo)))
7127 /* If we're building a construction vtable, we're not interested in
7128 subobjects that don't require construction vtables. */
7130 && !CLASSTYPE_VBASECLASSES (BINFO_TYPE (binfo))
7131 && !binfo_via_virtual (orig_binfo, BINFO_TYPE (rtti_binfo)))
7134 /* Build the initializers for the BINFO-in-T vtable. */
7136 = chainon (TREE_VALUE (inits),
7137 dfs_accumulate_vtbl_inits (binfo, orig_binfo,
7138 rtti_binfo, t, inits));
7140 /* Walk the BINFO and its bases. We walk in preorder so that as we
7141 initialize each vtable we can figure out at what offset the
7142 secondary vtable lies from the primary vtable. We can't use
7143 dfs_walk here because we need to iterate through bases of BINFO
7144 and RTTI_BINFO simultaneously. */
7145 for (i = 0; BINFO_BASE_ITERATE (binfo, i, base_binfo); ++i)
7147 /* Skip virtual bases. */
7148 if (BINFO_VIRTUAL_P (base_binfo))
7150 accumulate_vtbl_inits (base_binfo,
7151 BINFO_BASE_BINFO (orig_binfo, i),
7157 /* Called from accumulate_vtbl_inits. Returns the initializers for
7158 the BINFO vtable. */
7161 dfs_accumulate_vtbl_inits (tree binfo,
7167 tree inits = NULL_TREE;
7168 tree vtbl = NULL_TREE;
7169 int ctor_vtbl_p = !SAME_BINFO_TYPE_P (BINFO_TYPE (rtti_binfo), t);
7172 && BINFO_VIRTUAL_P (orig_binfo) && BINFO_PRIMARY_P (orig_binfo))
7174 /* In the hierarchy of BINFO_TYPE (RTTI_BINFO), this is a
7175 primary virtual base. If it is not the same primary in
7176 the hierarchy of T, we'll need to generate a ctor vtable
7177 for it, to place at its location in T. If it is the same
7178 primary, we still need a VTT entry for the vtable, but it
7179 should point to the ctor vtable for the base it is a
7180 primary for within the sub-hierarchy of RTTI_BINFO.
7182 There are three possible cases:
7184 1) We are in the same place.
7185 2) We are a primary base within a lost primary virtual base of
7187 3) We are primary to something not a base of RTTI_BINFO. */
7190 tree last = NULL_TREE;
7192 /* First, look through the bases we are primary to for RTTI_BINFO
7193 or a virtual base. */
7195 while (BINFO_PRIMARY_P (b))
7197 b = BINFO_INHERITANCE_CHAIN (b);
7199 if (BINFO_VIRTUAL_P (b) || b == rtti_binfo)
7202 /* If we run out of primary links, keep looking down our
7203 inheritance chain; we might be an indirect primary. */
7204 for (b = last; b; b = BINFO_INHERITANCE_CHAIN (b))
7205 if (BINFO_VIRTUAL_P (b) || b == rtti_binfo)
7209 /* If we found RTTI_BINFO, this is case 1. If we found a virtual
7210 base B and it is a base of RTTI_BINFO, this is case 2. In
7211 either case, we share our vtable with LAST, i.e. the
7212 derived-most base within B of which we are a primary. */
7214 || (b && binfo_for_vbase (BINFO_TYPE (b), BINFO_TYPE (rtti_binfo))))
7215 /* Just set our BINFO_VTABLE to point to LAST, as we may not have
7216 set LAST's BINFO_VTABLE yet. We'll extract the actual vptr in
7217 binfo_ctor_vtable after everything's been set up. */
7220 /* Otherwise, this is case 3 and we get our own. */
7222 else if (!BINFO_NEW_VTABLE_MARKED (orig_binfo))
7230 /* Compute the initializer for this vtable. */
7231 inits = build_vtbl_initializer (binfo, orig_binfo, t, rtti_binfo,
7234 /* Figure out the position to which the VPTR should point. */
7235 vtbl = TREE_PURPOSE (l);
7236 vtbl = build1 (ADDR_EXPR, vtbl_ptr_type_node, vtbl);
7237 index = size_binop (PLUS_EXPR,
7238 size_int (non_fn_entries),
7239 size_int (list_length (TREE_VALUE (l))));
7240 index = size_binop (MULT_EXPR,
7241 TYPE_SIZE_UNIT (vtable_entry_type),
7243 vtbl = build2 (POINTER_PLUS_EXPR, TREE_TYPE (vtbl), vtbl, index);
7247 /* For a construction vtable, we can't overwrite BINFO_VTABLE.
7248 So, we make a TREE_LIST. Later, dfs_fixup_binfo_vtbls will
7249 straighten this out. */
7250 BINFO_VTABLE (binfo) = tree_cons (rtti_binfo, vtbl, BINFO_VTABLE (binfo));
7251 else if (BINFO_PRIMARY_P (binfo) && BINFO_VIRTUAL_P (binfo))
7254 /* For an ordinary vtable, set BINFO_VTABLE. */
7255 BINFO_VTABLE (binfo) = vtbl;
7260 static GTY(()) tree abort_fndecl_addr;
7262 /* Construct the initializer for BINFO's virtual function table. BINFO
7263 is part of the hierarchy dominated by T. If we're building a
7264 construction vtable, the ORIG_BINFO is the binfo we should use to
7265 find the actual function pointers to put in the vtable - but they
7266 can be overridden on the path to most-derived in the graph that
7267 ORIG_BINFO belongs. Otherwise,
7268 ORIG_BINFO should be the same as BINFO. The RTTI_BINFO is the
7269 BINFO that should be indicated by the RTTI information in the
7270 vtable; it will be a base class of T, rather than T itself, if we
7271 are building a construction vtable.
7273 The value returned is a TREE_LIST suitable for wrapping in a
7274 CONSTRUCTOR to use as the DECL_INITIAL for a vtable. If
7275 NON_FN_ENTRIES_P is not NULL, *NON_FN_ENTRIES_P is set to the
7276 number of non-function entries in the vtable.
7278 It might seem that this function should never be called with a
7279 BINFO for which BINFO_PRIMARY_P holds, the vtable for such a
7280 base is always subsumed by a derived class vtable. However, when
7281 we are building construction vtables, we do build vtables for
7282 primary bases; we need these while the primary base is being
7286 build_vtbl_initializer (tree binfo,
7290 int* non_fn_entries_p)
7297 VEC(tree,gc) *vbases;
7299 /* Initialize VID. */
7300 memset (&vid, 0, sizeof (vid));
7303 vid.rtti_binfo = rtti_binfo;
7304 vid.last_init = &vid.inits;
7305 vid.primary_vtbl_p = SAME_BINFO_TYPE_P (BINFO_TYPE (binfo), t);
7306 vid.ctor_vtbl_p = !SAME_BINFO_TYPE_P (BINFO_TYPE (rtti_binfo), t);
7307 vid.generate_vcall_entries = true;
7308 /* The first vbase or vcall offset is at index -3 in the vtable. */
7309 vid.index = ssize_int(-3 * TARGET_VTABLE_DATA_ENTRY_DISTANCE);
7311 /* Add entries to the vtable for RTTI. */
7312 build_rtti_vtbl_entries (binfo, &vid);
7314 /* Create an array for keeping track of the functions we've
7315 processed. When we see multiple functions with the same
7316 signature, we share the vcall offsets. */
7317 vid.fns = VEC_alloc (tree, gc, 32);
7318 /* Add the vcall and vbase offset entries. */
7319 build_vcall_and_vbase_vtbl_entries (binfo, &vid);
7321 /* Clear BINFO_VTABLE_PATH_MARKED; it's set by
7322 build_vbase_offset_vtbl_entries. */
7323 for (vbases = CLASSTYPE_VBASECLASSES (t), ix = 0;
7324 VEC_iterate (tree, vbases, ix, vbinfo); ix++)
7325 BINFO_VTABLE_PATH_MARKED (vbinfo) = 0;
7327 /* If the target requires padding between data entries, add that now. */
7328 if (TARGET_VTABLE_DATA_ENTRY_DISTANCE > 1)
7332 for (prev = &vid.inits; (cur = *prev); prev = &TREE_CHAIN (cur))
7337 for (i = 1; i < TARGET_VTABLE_DATA_ENTRY_DISTANCE; ++i)
7338 add = tree_cons (NULL_TREE,
7339 build1 (NOP_EXPR, vtable_entry_type,
7346 if (non_fn_entries_p)
7347 *non_fn_entries_p = list_length (vid.inits);
7349 /* Go through all the ordinary virtual functions, building up
7351 vfun_inits = NULL_TREE;
7352 for (v = BINFO_VIRTUALS (orig_binfo); v; v = TREE_CHAIN (v))
7356 tree fn, fn_original;
7357 tree init = NULL_TREE;
7361 if (DECL_THUNK_P (fn))
7363 if (!DECL_NAME (fn))
7365 if (THUNK_ALIAS (fn))
7367 fn = THUNK_ALIAS (fn);
7370 fn_original = THUNK_TARGET (fn);
7373 /* If the only definition of this function signature along our
7374 primary base chain is from a lost primary, this vtable slot will
7375 never be used, so just zero it out. This is important to avoid
7376 requiring extra thunks which cannot be generated with the function.
7378 We first check this in update_vtable_entry_for_fn, so we handle
7379 restored primary bases properly; we also need to do it here so we
7380 zero out unused slots in ctor vtables, rather than filling themff
7381 with erroneous values (though harmless, apart from relocation
7383 for (b = binfo; ; b = get_primary_binfo (b))
7385 /* We found a defn before a lost primary; go ahead as normal. */
7386 if (look_for_overrides_here (BINFO_TYPE (b), fn_original))
7389 /* The nearest definition is from a lost primary; clear the
7391 if (BINFO_LOST_PRIMARY_P (b))
7393 init = size_zero_node;
7400 /* Pull the offset for `this', and the function to call, out of
7402 delta = BV_DELTA (v);
7403 vcall_index = BV_VCALL_INDEX (v);
7405 gcc_assert (TREE_CODE (delta) == INTEGER_CST);
7406 gcc_assert (TREE_CODE (fn) == FUNCTION_DECL);
7408 /* You can't call an abstract virtual function; it's abstract.
7409 So, we replace these functions with __pure_virtual. */
7410 if (DECL_PURE_VIRTUAL_P (fn_original))
7413 if (abort_fndecl_addr == NULL)
7414 abort_fndecl_addr = build1 (ADDR_EXPR, vfunc_ptr_type_node, fn);
7415 init = abort_fndecl_addr;
7419 if (!integer_zerop (delta) || vcall_index)
7421 fn = make_thunk (fn, /*this_adjusting=*/1, delta, vcall_index);
7422 if (!DECL_NAME (fn))
7425 /* Take the address of the function, considering it to be of an
7426 appropriate generic type. */
7427 init = build1 (ADDR_EXPR, vfunc_ptr_type_node, fn);
7431 /* And add it to the chain of initializers. */
7432 if (TARGET_VTABLE_USES_DESCRIPTORS)
7435 if (init == size_zero_node)
7436 for (i = 0; i < TARGET_VTABLE_USES_DESCRIPTORS; ++i)
7437 vfun_inits = tree_cons (NULL_TREE, init, vfun_inits);
7439 for (i = 0; i < TARGET_VTABLE_USES_DESCRIPTORS; ++i)
7441 tree fdesc = build2 (FDESC_EXPR, vfunc_ptr_type_node,
7442 TREE_OPERAND (init, 0),
7443 build_int_cst (NULL_TREE, i));
7444 TREE_CONSTANT (fdesc) = 1;
7445 TREE_INVARIANT (fdesc) = 1;
7447 vfun_inits = tree_cons (NULL_TREE, fdesc, vfun_inits);
7451 vfun_inits = tree_cons (NULL_TREE, init, vfun_inits);
7454 /* The initializers for virtual functions were built up in reverse
7455 order; straighten them out now. */
7456 vfun_inits = nreverse (vfun_inits);
7458 /* The negative offset initializers are also in reverse order. */
7459 vid.inits = nreverse (vid.inits);
7461 /* Chain the two together. */
7462 return chainon (vid.inits, vfun_inits);
7465 /* Adds to vid->inits the initializers for the vbase and vcall
7466 offsets in BINFO, which is in the hierarchy dominated by T. */
7469 build_vcall_and_vbase_vtbl_entries (tree binfo, vtbl_init_data* vid)
7473 /* If this is a derived class, we must first create entries
7474 corresponding to the primary base class. */
7475 b = get_primary_binfo (binfo);
7477 build_vcall_and_vbase_vtbl_entries (b, vid);
7479 /* Add the vbase entries for this base. */
7480 build_vbase_offset_vtbl_entries (binfo, vid);
7481 /* Add the vcall entries for this base. */
7482 build_vcall_offset_vtbl_entries (binfo, vid);
7485 /* Returns the initializers for the vbase offset entries in the vtable
7486 for BINFO (which is part of the class hierarchy dominated by T), in
7487 reverse order. VBASE_OFFSET_INDEX gives the vtable index
7488 where the next vbase offset will go. */
7491 build_vbase_offset_vtbl_entries (tree binfo, vtbl_init_data* vid)
7495 tree non_primary_binfo;
7497 /* If there are no virtual baseclasses, then there is nothing to
7499 if (!CLASSTYPE_VBASECLASSES (BINFO_TYPE (binfo)))
7504 /* We might be a primary base class. Go up the inheritance hierarchy
7505 until we find the most derived class of which we are a primary base:
7506 it is the offset of that which we need to use. */
7507 non_primary_binfo = binfo;
7508 while (BINFO_INHERITANCE_CHAIN (non_primary_binfo))
7512 /* If we have reached a virtual base, then it must be a primary
7513 base (possibly multi-level) of vid->binfo, or we wouldn't
7514 have called build_vcall_and_vbase_vtbl_entries for it. But it
7515 might be a lost primary, so just skip down to vid->binfo. */
7516 if (BINFO_VIRTUAL_P (non_primary_binfo))
7518 non_primary_binfo = vid->binfo;
7522 b = BINFO_INHERITANCE_CHAIN (non_primary_binfo);
7523 if (get_primary_binfo (b) != non_primary_binfo)
7525 non_primary_binfo = b;
7528 /* Go through the virtual bases, adding the offsets. */
7529 for (vbase = TYPE_BINFO (BINFO_TYPE (binfo));
7531 vbase = TREE_CHAIN (vbase))
7536 if (!BINFO_VIRTUAL_P (vbase))
7539 /* Find the instance of this virtual base in the complete
7541 b = copied_binfo (vbase, binfo);
7543 /* If we've already got an offset for this virtual base, we
7544 don't need another one. */
7545 if (BINFO_VTABLE_PATH_MARKED (b))
7547 BINFO_VTABLE_PATH_MARKED (b) = 1;
7549 /* Figure out where we can find this vbase offset. */
7550 delta = size_binop (MULT_EXPR,
7553 TYPE_SIZE_UNIT (vtable_entry_type)));
7554 if (vid->primary_vtbl_p)
7555 BINFO_VPTR_FIELD (b) = delta;
7557 if (binfo != TYPE_BINFO (t))
7558 /* The vbase offset had better be the same. */
7559 gcc_assert (tree_int_cst_equal (delta, BINFO_VPTR_FIELD (vbase)));
7561 /* The next vbase will come at a more negative offset. */
7562 vid->index = size_binop (MINUS_EXPR, vid->index,
7563 ssize_int (TARGET_VTABLE_DATA_ENTRY_DISTANCE));
7565 /* The initializer is the delta from BINFO to this virtual base.
7566 The vbase offsets go in reverse inheritance-graph order, and
7567 we are walking in inheritance graph order so these end up in
7569 delta = size_diffop (BINFO_OFFSET (b), BINFO_OFFSET (non_primary_binfo));
7572 = build_tree_list (NULL_TREE,
7573 fold_build1 (NOP_EXPR,
7576 vid->last_init = &TREE_CHAIN (*vid->last_init);
7580 /* Adds the initializers for the vcall offset entries in the vtable
7581 for BINFO (which is part of the class hierarchy dominated by VID->DERIVED)
7585 build_vcall_offset_vtbl_entries (tree binfo, vtbl_init_data* vid)
7587 /* We only need these entries if this base is a virtual base. We
7588 compute the indices -- but do not add to the vtable -- when
7589 building the main vtable for a class. */
7590 if (binfo == TYPE_BINFO (vid->derived)
7591 || (BINFO_VIRTUAL_P (binfo)
7592 /* If BINFO is RTTI_BINFO, then (since BINFO does not
7593 correspond to VID->DERIVED), we are building a primary
7594 construction virtual table. Since this is a primary
7595 virtual table, we do not need the vcall offsets for
7597 && binfo != vid->rtti_binfo))
7599 /* We need a vcall offset for each of the virtual functions in this
7600 vtable. For example:
7602 class A { virtual void f (); };
7603 class B1 : virtual public A { virtual void f (); };
7604 class B2 : virtual public A { virtual void f (); };
7605 class C: public B1, public B2 { virtual void f (); };
7607 A C object has a primary base of B1, which has a primary base of A. A
7608 C also has a secondary base of B2, which no longer has a primary base
7609 of A. So the B2-in-C construction vtable needs a secondary vtable for
7610 A, which will adjust the A* to a B2* to call f. We have no way of
7611 knowing what (or even whether) this offset will be when we define B2,
7612 so we store this "vcall offset" in the A sub-vtable and look it up in
7613 a "virtual thunk" for B2::f.
7615 We need entries for all the functions in our primary vtable and
7616 in our non-virtual bases' secondary vtables. */
7618 /* If we are just computing the vcall indices -- but do not need
7619 the actual entries -- not that. */
7620 if (!BINFO_VIRTUAL_P (binfo))
7621 vid->generate_vcall_entries = false;
7622 /* Now, walk through the non-virtual bases, adding vcall offsets. */
7623 add_vcall_offset_vtbl_entries_r (binfo, vid);
7627 /* Build vcall offsets, starting with those for BINFO. */
7630 add_vcall_offset_vtbl_entries_r (tree binfo, vtbl_init_data* vid)
7636 /* Don't walk into virtual bases -- except, of course, for the
7637 virtual base for which we are building vcall offsets. Any
7638 primary virtual base will have already had its offsets generated
7639 through the recursion in build_vcall_and_vbase_vtbl_entries. */
7640 if (BINFO_VIRTUAL_P (binfo) && vid->vbase != binfo)
7643 /* If BINFO has a primary base, process it first. */
7644 primary_binfo = get_primary_binfo (binfo);
7646 add_vcall_offset_vtbl_entries_r (primary_binfo, vid);
7648 /* Add BINFO itself to the list. */
7649 add_vcall_offset_vtbl_entries_1 (binfo, vid);
7651 /* Scan the non-primary bases of BINFO. */
7652 for (i = 0; BINFO_BASE_ITERATE (binfo, i, base_binfo); ++i)
7653 if (base_binfo != primary_binfo)
7654 add_vcall_offset_vtbl_entries_r (base_binfo, vid);
7657 /* Called from build_vcall_offset_vtbl_entries_r. */
7660 add_vcall_offset_vtbl_entries_1 (tree binfo, vtbl_init_data* vid)
7662 /* Make entries for the rest of the virtuals. */
7663 if (abi_version_at_least (2))
7667 /* The ABI requires that the methods be processed in declaration
7668 order. G++ 3.2 used the order in the vtable. */
7669 for (orig_fn = TYPE_METHODS (BINFO_TYPE (binfo));
7671 orig_fn = TREE_CHAIN (orig_fn))
7672 if (DECL_VINDEX (orig_fn))
7673 add_vcall_offset (orig_fn, binfo, vid);
7677 tree derived_virtuals;
7680 /* If BINFO is a primary base, the most derived class which has
7681 BINFO as a primary base; otherwise, just BINFO. */
7682 tree non_primary_binfo;
7684 /* We might be a primary base class. Go up the inheritance hierarchy
7685 until we find the most derived class of which we are a primary base:
7686 it is the BINFO_VIRTUALS there that we need to consider. */
7687 non_primary_binfo = binfo;
7688 while (BINFO_INHERITANCE_CHAIN (non_primary_binfo))
7692 /* If we have reached a virtual base, then it must be vid->vbase,
7693 because we ignore other virtual bases in
7694 add_vcall_offset_vtbl_entries_r. In turn, it must be a primary
7695 base (possibly multi-level) of vid->binfo, or we wouldn't
7696 have called build_vcall_and_vbase_vtbl_entries for it. But it
7697 might be a lost primary, so just skip down to vid->binfo. */
7698 if (BINFO_VIRTUAL_P (non_primary_binfo))
7700 gcc_assert (non_primary_binfo == vid->vbase);
7701 non_primary_binfo = vid->binfo;
7705 b = BINFO_INHERITANCE_CHAIN (non_primary_binfo);
7706 if (get_primary_binfo (b) != non_primary_binfo)
7708 non_primary_binfo = b;
7711 if (vid->ctor_vtbl_p)
7712 /* For a ctor vtable we need the equivalent binfo within the hierarchy
7713 where rtti_binfo is the most derived type. */
7715 = original_binfo (non_primary_binfo, vid->rtti_binfo);
7717 for (base_virtuals = BINFO_VIRTUALS (binfo),
7718 derived_virtuals = BINFO_VIRTUALS (non_primary_binfo),
7719 orig_virtuals = BINFO_VIRTUALS (TYPE_BINFO (BINFO_TYPE (binfo)));
7721 base_virtuals = TREE_CHAIN (base_virtuals),
7722 derived_virtuals = TREE_CHAIN (derived_virtuals),
7723 orig_virtuals = TREE_CHAIN (orig_virtuals))
7727 /* Find the declaration that originally caused this function to
7728 be present in BINFO_TYPE (binfo). */
7729 orig_fn = BV_FN (orig_virtuals);
7731 /* When processing BINFO, we only want to generate vcall slots for
7732 function slots introduced in BINFO. So don't try to generate
7733 one if the function isn't even defined in BINFO. */
7734 if (!SAME_BINFO_TYPE_P (BINFO_TYPE (binfo), DECL_CONTEXT (orig_fn)))
7737 add_vcall_offset (orig_fn, binfo, vid);
7742 /* Add a vcall offset entry for ORIG_FN to the vtable. */
7745 add_vcall_offset (tree orig_fn, tree binfo, vtbl_init_data *vid)
7751 /* If there is already an entry for a function with the same
7752 signature as FN, then we do not need a second vcall offset.
7753 Check the list of functions already present in the derived
7755 for (i = 0; VEC_iterate (tree, vid->fns, i, derived_entry); ++i)
7757 if (same_signature_p (derived_entry, orig_fn)
7758 /* We only use one vcall offset for virtual destructors,
7759 even though there are two virtual table entries. */
7760 || (DECL_DESTRUCTOR_P (derived_entry)
7761 && DECL_DESTRUCTOR_P (orig_fn)))
7765 /* If we are building these vcall offsets as part of building
7766 the vtable for the most derived class, remember the vcall
7768 if (vid->binfo == TYPE_BINFO (vid->derived))
7770 tree_pair_p elt = VEC_safe_push (tree_pair_s, gc,
7771 CLASSTYPE_VCALL_INDICES (vid->derived),
7773 elt->purpose = orig_fn;
7774 elt->value = vid->index;
7777 /* The next vcall offset will be found at a more negative
7779 vid->index = size_binop (MINUS_EXPR, vid->index,
7780 ssize_int (TARGET_VTABLE_DATA_ENTRY_DISTANCE));
7782 /* Keep track of this function. */
7783 VEC_safe_push (tree, gc, vid->fns, orig_fn);
7785 if (vid->generate_vcall_entries)
7790 /* Find the overriding function. */
7791 fn = find_final_overrider (vid->rtti_binfo, binfo, orig_fn);
7792 if (fn == error_mark_node)
7793 vcall_offset = build1 (NOP_EXPR, vtable_entry_type,
7797 base = TREE_VALUE (fn);
7799 /* The vbase we're working on is a primary base of
7800 vid->binfo. But it might be a lost primary, so its
7801 BINFO_OFFSET might be wrong, so we just use the
7802 BINFO_OFFSET from vid->binfo. */
7803 vcall_offset = size_diffop (BINFO_OFFSET (base),
7804 BINFO_OFFSET (vid->binfo));
7805 vcall_offset = fold_build1 (NOP_EXPR, vtable_entry_type,
7808 /* Add the initializer to the vtable. */
7809 *vid->last_init = build_tree_list (NULL_TREE, vcall_offset);
7810 vid->last_init = &TREE_CHAIN (*vid->last_init);
7814 /* Return vtbl initializers for the RTTI entries corresponding to the
7815 BINFO's vtable. The RTTI entries should indicate the object given
7816 by VID->rtti_binfo. */
7819 build_rtti_vtbl_entries (tree binfo, vtbl_init_data* vid)
7828 basetype = BINFO_TYPE (binfo);
7829 t = BINFO_TYPE (vid->rtti_binfo);
7831 /* To find the complete object, we will first convert to our most
7832 primary base, and then add the offset in the vtbl to that value. */
7834 while (CLASSTYPE_HAS_PRIMARY_BASE_P (BINFO_TYPE (b))
7835 && !BINFO_LOST_PRIMARY_P (b))
7839 primary_base = get_primary_binfo (b);
7840 gcc_assert (BINFO_PRIMARY_P (primary_base)
7841 && BINFO_INHERITANCE_CHAIN (primary_base) == b);
7844 offset = size_diffop (BINFO_OFFSET (vid->rtti_binfo), BINFO_OFFSET (b));
7846 /* The second entry is the address of the typeinfo object. */
7848 decl = build_address (get_tinfo_decl (t));
7850 decl = integer_zero_node;
7852 /* Convert the declaration to a type that can be stored in the
7854 init = build_nop (vfunc_ptr_type_node, decl);
7855 *vid->last_init = build_tree_list (NULL_TREE, init);
7856 vid->last_init = &TREE_CHAIN (*vid->last_init);
7858 /* Add the offset-to-top entry. It comes earlier in the vtable than
7859 the typeinfo entry. Convert the offset to look like a
7860 function pointer, so that we can put it in the vtable. */
7861 init = build_nop (vfunc_ptr_type_node, offset);
7862 *vid->last_init = build_tree_list (NULL_TREE, init);
7863 vid->last_init = &TREE_CHAIN (*vid->last_init);
7866 /* Fold a OBJ_TYPE_REF expression to the address of a function.
7867 KNOWN_TYPE carries the true type of OBJ_TYPE_REF_OBJECT(REF). */
7870 cp_fold_obj_type_ref (tree ref, tree known_type)
7872 HOST_WIDE_INT index = tree_low_cst (OBJ_TYPE_REF_TOKEN (ref), 1);
7873 HOST_WIDE_INT i = 0;
7874 tree v = BINFO_VIRTUALS (TYPE_BINFO (known_type));
7879 i += (TARGET_VTABLE_USES_DESCRIPTORS
7880 ? TARGET_VTABLE_USES_DESCRIPTORS : 1);
7886 #ifdef ENABLE_CHECKING
7887 gcc_assert (tree_int_cst_equal (OBJ_TYPE_REF_TOKEN (ref),
7888 DECL_VINDEX (fndecl)));
7891 cgraph_node (fndecl)->local.vtable_method = true;
7893 return build_address (fndecl);
7896 #include "gt-cp-class.h"