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 Free Software Foundation, Inc.
4 Contributed by Michael Tiemann (tiemann@cygnus.com)
6 This file is part of GCC.
8 GCC is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2, or (at your option)
13 GCC is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with GCC; see the file COPYING. If not, write to
20 the Free Software Foundation, 59 Temple Place - Suite 330,
21 Boston, MA 02111-1307, USA. */
24 /* High-level class interface. */
28 #include "coretypes.h"
39 /* The number of nested classes being processed. If we are not in the
40 scope of any class, this is zero. */
42 int current_class_depth
;
44 /* In order to deal with nested classes, we keep a stack of classes.
45 The topmost entry is the innermost class, and is the entry at index
46 CURRENT_CLASS_DEPTH */
48 typedef struct class_stack_node
{
49 /* The name of the class. */
52 /* The _TYPE node for the class. */
55 /* The access specifier pending for new declarations in the scope of
59 /* If were defining TYPE, the names used in this class. */
60 splay_tree names_used
;
61 }* class_stack_node_t
;
63 typedef struct vtbl_init_data_s
65 /* The base for which we're building initializers. */
67 /* The type of the most-derived type. */
69 /* The binfo for the dynamic type. This will be TYPE_BINFO (derived),
70 unless ctor_vtbl_p is true. */
72 /* The negative-index vtable initializers built up so far. These
73 are in order from least negative index to most negative index. */
75 /* The last (i.e., most negative) entry in INITS. */
77 /* The binfo for the virtual base for which we're building
78 vcall offset initializers. */
80 /* The functions in vbase for which we have already provided vcall
83 /* The vtable index of the next vcall or vbase offset. */
85 /* Nonzero if we are building the initializer for the primary
88 /* Nonzero if we are building the initializer for a construction
91 /* True when adding vcall offset entries to the vtable. False when
92 merely computing the indices. */
93 bool generate_vcall_entries
;
96 /* The type of a function passed to walk_subobject_offsets. */
97 typedef int (*subobject_offset_fn
) (tree
, tree
, splay_tree
);
99 /* The stack itself. This is a dynamically resized array. The
100 number of elements allocated is CURRENT_CLASS_STACK_SIZE. */
101 static int current_class_stack_size
;
102 static class_stack_node_t current_class_stack
;
104 /* An array of all local classes present in this translation unit, in
105 declaration order. */
106 varray_type local_classes
;
108 static tree
get_vfield_name (tree
);
109 static void finish_struct_anon (tree
);
110 static tree
get_vtable_name (tree
);
111 static tree
get_basefndecls (tree
, tree
);
112 static int build_primary_vtable (tree
, tree
);
113 static int build_secondary_vtable (tree
);
114 static void finish_vtbls (tree
);
115 static void modify_vtable_entry (tree
, tree
, tree
, tree
, tree
*);
116 static void finish_struct_bits (tree
);
117 static int alter_access (tree
, tree
, tree
);
118 static void handle_using_decl (tree
, tree
);
119 static tree
dfs_modify_vtables (tree
, void *);
120 static tree
modify_all_vtables (tree
, tree
);
121 static void determine_primary_bases (tree
);
122 static void finish_struct_methods (tree
);
123 static void maybe_warn_about_overly_private_class (tree
);
124 static int method_name_cmp (const void *, const void *);
125 static int resort_method_name_cmp (const void *, const void *);
126 static void add_implicitly_declared_members (tree
, int, int);
127 static tree
fixed_type_or_null (tree
, int *, int *);
128 static tree
resolve_address_of_overloaded_function (tree
, tree
, tsubst_flags_t
,
130 static tree
build_simple_base_path (tree expr
, tree binfo
);
131 static tree
build_vtbl_ref_1 (tree
, tree
);
132 static tree
build_vtbl_initializer (tree
, tree
, tree
, tree
, int *);
133 static int count_fields (tree
);
134 static int add_fields_to_record_type (tree
, struct sorted_fields_type
*, int);
135 static void check_bitfield_decl (tree
);
136 static void check_field_decl (tree
, tree
, int *, int *, int *);
137 static void check_field_decls (tree
, tree
*, int *, int *);
138 static tree
*build_base_field (record_layout_info
, tree
, splay_tree
, tree
*);
139 static void build_base_fields (record_layout_info
, splay_tree
, tree
*);
140 static void check_methods (tree
);
141 static void remove_zero_width_bit_fields (tree
);
142 static void check_bases (tree
, int *, int *);
143 static void check_bases_and_members (tree
);
144 static tree
create_vtable_ptr (tree
, tree
*);
145 static void include_empty_classes (record_layout_info
);
146 static void layout_class_type (tree
, tree
*);
147 static void fixup_pending_inline (tree
);
148 static void fixup_inline_methods (tree
);
149 static void propagate_binfo_offsets (tree
, tree
);
150 static void layout_virtual_bases (record_layout_info
, splay_tree
);
151 static void build_vbase_offset_vtbl_entries (tree
, vtbl_init_data
*);
152 static void add_vcall_offset_vtbl_entries_r (tree
, vtbl_init_data
*);
153 static void add_vcall_offset_vtbl_entries_1 (tree
, vtbl_init_data
*);
154 static void build_vcall_offset_vtbl_entries (tree
, vtbl_init_data
*);
155 static void add_vcall_offset (tree
, tree
, vtbl_init_data
*);
156 static void layout_vtable_decl (tree
, int);
157 static tree
dfs_find_final_overrider_pre (tree
, void *);
158 static tree
dfs_find_final_overrider_post (tree
, void *);
159 static tree
find_final_overrider (tree
, tree
, tree
);
160 static int make_new_vtable (tree
, tree
);
161 static int maybe_indent_hierarchy (FILE *, int, int);
162 static tree
dump_class_hierarchy_r (FILE *, int, tree
, tree
, int);
163 static void dump_class_hierarchy (tree
);
164 static void dump_class_hierarchy_1 (FILE *, int, tree
);
165 static void dump_array (FILE *, tree
);
166 static void dump_vtable (tree
, tree
, tree
);
167 static void dump_vtt (tree
, tree
);
168 static void dump_thunk (FILE *, int, tree
);
169 static tree
build_vtable (tree
, tree
, tree
);
170 static void initialize_vtable (tree
, tree
);
171 static void layout_nonempty_base_or_field (record_layout_info
,
172 tree
, tree
, splay_tree
);
173 static tree
end_of_class (tree
, int);
174 static bool layout_empty_base (tree
, tree
, splay_tree
);
175 static void accumulate_vtbl_inits (tree
, tree
, tree
, tree
, tree
);
176 static tree
dfs_accumulate_vtbl_inits (tree
, tree
, tree
, tree
,
178 static void build_rtti_vtbl_entries (tree
, vtbl_init_data
*);
179 static void build_vcall_and_vbase_vtbl_entries (tree
, vtbl_init_data
*);
180 static void clone_constructors_and_destructors (tree
);
181 static tree
build_clone (tree
, tree
);
182 static void update_vtable_entry_for_fn (tree
, tree
, tree
, tree
*, unsigned);
183 static void build_ctor_vtbl_group (tree
, tree
);
184 static void build_vtt (tree
);
185 static tree
binfo_ctor_vtable (tree
);
186 static tree
*build_vtt_inits (tree
, tree
, tree
*, tree
*);
187 static tree
dfs_build_secondary_vptr_vtt_inits (tree
, void *);
188 static tree
dfs_fixup_binfo_vtbls (tree
, void *);
189 static int record_subobject_offset (tree
, tree
, splay_tree
);
190 static int check_subobject_offset (tree
, tree
, splay_tree
);
191 static int walk_subobject_offsets (tree
, subobject_offset_fn
,
192 tree
, splay_tree
, tree
, int);
193 static void record_subobject_offsets (tree
, tree
, splay_tree
, int);
194 static int layout_conflict_p (tree
, tree
, splay_tree
, int);
195 static int splay_tree_compare_integer_csts (splay_tree_key k1
,
197 static void warn_about_ambiguous_bases (tree
);
198 static bool type_requires_array_cookie (tree
);
199 static bool contains_empty_class_p (tree
);
200 static bool base_derived_from (tree
, tree
);
201 static int empty_base_at_nonzero_offset_p (tree
, tree
, splay_tree
);
202 static tree
end_of_base (tree
);
203 static tree
get_vcall_index (tree
, tree
);
205 /* Variables shared between class.c and call.c. */
207 #ifdef GATHER_STATISTICS
209 int n_vtable_entries
= 0;
210 int n_vtable_searches
= 0;
211 int n_vtable_elems
= 0;
212 int n_convert_harshness
= 0;
213 int n_compute_conversion_costs
= 0;
214 int n_inner_fields_searched
= 0;
217 /* Convert to or from a base subobject. EXPR is an expression of type
218 `A' or `A*', an expression of type `B' or `B*' is returned. To
219 convert A to a base B, CODE is PLUS_EXPR and BINFO is the binfo for
220 the B base instance within A. To convert base A to derived B, CODE
221 is MINUS_EXPR and BINFO is the binfo for the A instance within B.
222 In this latter case, A must not be a morally virtual base of B.
223 NONNULL is true if EXPR is known to be non-NULL (this is only
224 needed when EXPR is of pointer type). CV qualifiers are preserved
228 build_base_path (enum tree_code code
,
233 tree v_binfo
= NULL_TREE
;
234 tree d_binfo
= NULL_TREE
;
238 tree null_test
= NULL
;
239 tree ptr_target_type
;
241 int want_pointer
= TREE_CODE (TREE_TYPE (expr
)) == POINTER_TYPE
;
242 bool has_empty
= false;
245 if (expr
== error_mark_node
|| binfo
== error_mark_node
|| !binfo
)
246 return error_mark_node
;
248 for (probe
= binfo
; probe
; probe
= BINFO_INHERITANCE_CHAIN (probe
))
251 if (is_empty_class (BINFO_TYPE (probe
)))
253 if (!v_binfo
&& BINFO_VIRTUAL_P (probe
))
257 probe
= TYPE_MAIN_VARIANT (TREE_TYPE (expr
));
259 probe
= TYPE_MAIN_VARIANT (TREE_TYPE (probe
));
261 gcc_assert ((code
== MINUS_EXPR
262 && SAME_BINFO_TYPE_P (BINFO_TYPE (binfo
), probe
))
263 || (code
== PLUS_EXPR
264 && SAME_BINFO_TYPE_P (BINFO_TYPE (d_binfo
), probe
)));
266 if (binfo
== d_binfo
)
270 if (code
== MINUS_EXPR
&& v_binfo
)
272 error ("cannot convert from base %qT to derived type %qT via virtual base %qT",
273 BINFO_TYPE (binfo
), BINFO_TYPE (d_binfo
), BINFO_TYPE (v_binfo
));
274 return error_mark_node
;
278 /* This must happen before the call to save_expr. */
279 expr
= build_unary_op (ADDR_EXPR
, expr
, 0);
281 offset
= BINFO_OFFSET (binfo
);
282 fixed_type_p
= resolves_to_fixed_type_p (expr
, &nonnull
);
284 /* Do we need to look in the vtable for the real offset? */
285 virtual_access
= (v_binfo
&& fixed_type_p
<= 0);
287 /* Do we need to check for a null pointer? */
288 if (want_pointer
&& !nonnull
&& (virtual_access
|| !integer_zerop (offset
)))
289 null_test
= error_mark_node
;
291 /* Protect against multiple evaluation if necessary. */
292 if (TREE_SIDE_EFFECTS (expr
) && (null_test
|| virtual_access
))
293 expr
= save_expr (expr
);
295 /* Now that we've saved expr, build the real null test. */
298 tree zero
= cp_convert (TREE_TYPE (expr
), integer_zero_node
);
299 null_test
= fold (build2 (NE_EXPR
, boolean_type_node
,
303 /* If this is a simple base reference, express it as a COMPONENT_REF. */
304 if (code
== PLUS_EXPR
&& !virtual_access
305 /* We don't build base fields for empty bases, and they aren't very
306 interesting to the optimizers anyway. */
309 expr
= build_indirect_ref (expr
, NULL
);
310 expr
= build_simple_base_path (expr
, binfo
);
312 expr
= build_address (expr
);
313 target_type
= TREE_TYPE (expr
);
319 /* Going via virtual base V_BINFO. We need the static offset
320 from V_BINFO to BINFO, and the dynamic offset from D_BINFO to
321 V_BINFO. That offset is an entry in D_BINFO's vtable. */
324 if (fixed_type_p
< 0 && in_base_initializer
)
326 /* In a base member initializer, we cannot rely on
327 the vtable being set up. We have to use the vtt_parm. */
328 tree derived
= BINFO_INHERITANCE_CHAIN (v_binfo
);
331 t
= TREE_TYPE (TYPE_VFIELD (BINFO_TYPE (derived
)));
332 t
= build_pointer_type (t
);
333 v_offset
= convert (t
, current_vtt_parm
);
334 v_offset
= build2 (PLUS_EXPR
, t
, v_offset
,
335 BINFO_VPTR_INDEX (derived
));
336 v_offset
= build_indirect_ref (v_offset
, NULL
);
339 v_offset
= build_vfield_ref (build_indirect_ref (expr
, NULL
),
340 TREE_TYPE (TREE_TYPE (expr
)));
342 v_offset
= build2 (PLUS_EXPR
, TREE_TYPE (v_offset
),
343 v_offset
, BINFO_VPTR_FIELD (v_binfo
));
344 v_offset
= build1 (NOP_EXPR
,
345 build_pointer_type (ptrdiff_type_node
),
347 v_offset
= build_indirect_ref (v_offset
, NULL
);
348 TREE_CONSTANT (v_offset
) = 1;
349 TREE_INVARIANT (v_offset
) = 1;
351 offset
= convert_to_integer (ptrdiff_type_node
,
353 BINFO_OFFSET (v_binfo
)));
355 if (!integer_zerop (offset
))
356 v_offset
= build2 (code
, ptrdiff_type_node
, v_offset
, offset
);
358 if (fixed_type_p
< 0)
359 /* Negative fixed_type_p means this is a constructor or destructor;
360 virtual base layout is fixed in in-charge [cd]tors, but not in
362 offset
= build3 (COND_EXPR
, ptrdiff_type_node
,
363 build2 (EQ_EXPR
, boolean_type_node
,
364 current_in_charge_parm
, integer_zero_node
),
366 BINFO_OFFSET (binfo
));
371 target_type
= code
== PLUS_EXPR
? BINFO_TYPE (binfo
) : BINFO_TYPE (d_binfo
);
373 target_type
= cp_build_qualified_type
374 (target_type
, cp_type_quals (TREE_TYPE (TREE_TYPE (expr
))));
375 ptr_target_type
= build_pointer_type (target_type
);
377 target_type
= ptr_target_type
;
379 expr
= build1 (NOP_EXPR
, ptr_target_type
, expr
);
381 if (!integer_zerop (offset
))
382 expr
= build2 (code
, ptr_target_type
, expr
, offset
);
387 expr
= build_indirect_ref (expr
, NULL
);
391 expr
= fold (build3 (COND_EXPR
, target_type
, null_test
, expr
,
392 fold (build1 (NOP_EXPR
, target_type
,
393 integer_zero_node
))));
398 /* Subroutine of build_base_path; EXPR and BINFO are as in that function.
399 Perform a derived-to-base conversion by recursively building up a
400 sequence of COMPONENT_REFs to the appropriate base fields. */
403 build_simple_base_path (tree expr
, tree binfo
)
405 tree type
= BINFO_TYPE (binfo
);
406 tree d_binfo
= BINFO_INHERITANCE_CHAIN (binfo
);
409 if (d_binfo
== NULL_TREE
)
413 gcc_assert (TYPE_MAIN_VARIANT (TREE_TYPE (expr
)) == type
);
415 /* Transform `(a, b).x' into `(*(a, &b)).x', `(a ? b : c).x'
416 into `(*(a ? &b : &c)).x', and so on. A COND_EXPR is only
417 an lvalue in the frontend; only _DECLs and _REFs are lvalues
419 temp
= unary_complex_lvalue (ADDR_EXPR
, expr
);
421 expr
= build_indirect_ref (temp
, NULL
);
427 expr
= build_simple_base_path (expr
, d_binfo
);
429 for (field
= TYPE_FIELDS (BINFO_TYPE (d_binfo
));
430 field
; field
= TREE_CHAIN (field
))
431 /* Is this the base field created by build_base_field? */
432 if (TREE_CODE (field
) == FIELD_DECL
433 && DECL_FIELD_IS_BASE (field
)
434 && TREE_TYPE (field
) == type
)
436 /* We don't use build_class_member_access_expr here, as that
437 has unnecessary checks, and more importantly results in
438 recursive calls to dfs_walk_once. */
439 int type_quals
= cp_type_quals (TREE_TYPE (expr
));
441 expr
= build3 (COMPONENT_REF
,
442 cp_build_qualified_type (type
, type_quals
),
443 expr
, field
, NULL_TREE
);
444 expr
= fold_if_not_in_template (expr
);
446 /* Mark the expression const or volatile, as appropriate.
447 Even though we've dealt with the type above, we still have
448 to mark the expression itself. */
449 if (type_quals
& TYPE_QUAL_CONST
)
450 TREE_READONLY (expr
) = 1;
451 if (type_quals
& TYPE_QUAL_VOLATILE
)
452 TREE_THIS_VOLATILE (expr
) = 1;
457 /* Didn't find the base field?!? */
461 /* Convert OBJECT to the base TYPE. OBJECT is an expression whose
462 type is a class type or a pointer to a class type. In the former
463 case, TYPE is also a class type; in the latter it is another
464 pointer type. If CHECK_ACCESS is true, an error message is emitted
465 if TYPE is inaccessible. If OBJECT has pointer type, the value is
466 assumed to be non-NULL. */
469 convert_to_base (tree object
, tree type
, bool check_access
, bool nonnull
)
474 if (TYPE_PTR_P (TREE_TYPE (object
)))
476 object_type
= TREE_TYPE (TREE_TYPE (object
));
477 type
= TREE_TYPE (type
);
480 object_type
= TREE_TYPE (object
);
482 binfo
= lookup_base (object_type
, type
,
483 check_access
? ba_check
: ba_unique
,
485 if (!binfo
|| binfo
== error_mark_node
)
486 return error_mark_node
;
488 return build_base_path (PLUS_EXPR
, object
, binfo
, nonnull
);
491 /* EXPR is an expression with unqualified class type. BASE is a base
492 binfo of that class type. Returns EXPR, converted to the BASE
493 type. This function assumes that EXPR is the most derived class;
494 therefore virtual bases can be found at their static offsets. */
497 convert_to_base_statically (tree expr
, tree base
)
501 expr_type
= TREE_TYPE (expr
);
502 if (!SAME_BINFO_TYPE_P (BINFO_TYPE (base
), expr_type
))
506 pointer_type
= build_pointer_type (expr_type
);
507 expr
= build_unary_op (ADDR_EXPR
, expr
, /*noconvert=*/1);
508 if (!integer_zerop (BINFO_OFFSET (base
)))
509 expr
= build2 (PLUS_EXPR
, pointer_type
, expr
,
510 build_nop (pointer_type
, BINFO_OFFSET (base
)));
511 expr
= build_nop (build_pointer_type (BINFO_TYPE (base
)), expr
);
512 expr
= build1 (INDIRECT_REF
, BINFO_TYPE (base
), expr
);
520 build_vfield_ref (tree datum
, tree type
)
522 tree vfield
, vcontext
;
524 if (datum
== error_mark_node
)
525 return error_mark_node
;
527 /* First, convert to the requested type. */
528 if (!same_type_ignoring_top_level_qualifiers_p (TREE_TYPE (datum
), type
))
529 datum
= convert_to_base (datum
, type
, /*check_access=*/false,
532 /* Second, the requested type may not be the owner of its own vptr.
533 If not, convert to the base class that owns it. We cannot use
534 convert_to_base here, because VCONTEXT may appear more than once
535 in the inheritance hierarchy of TYPE, and thus direct conversion
536 between the types may be ambiguous. Following the path back up
537 one step at a time via primary bases avoids the problem. */
538 vfield
= TYPE_VFIELD (type
);
539 vcontext
= DECL_CONTEXT (vfield
);
540 while (!same_type_ignoring_top_level_qualifiers_p (vcontext
, type
))
542 datum
= build_simple_base_path (datum
, CLASSTYPE_PRIMARY_BINFO (type
));
543 type
= TREE_TYPE (datum
);
546 return build3 (COMPONENT_REF
, TREE_TYPE (vfield
), datum
, vfield
, NULL_TREE
);
549 /* Given an object INSTANCE, return an expression which yields the
550 vtable element corresponding to INDEX. There are many special
551 cases for INSTANCE which we take care of here, mainly to avoid
552 creating extra tree nodes when we don't have to. */
555 build_vtbl_ref_1 (tree instance
, tree idx
)
558 tree vtbl
= NULL_TREE
;
560 /* Try to figure out what a reference refers to, and
561 access its virtual function table directly. */
564 tree fixed_type
= fixed_type_or_null (instance
, NULL
, &cdtorp
);
566 tree basetype
= non_reference (TREE_TYPE (instance
));
568 if (fixed_type
&& !cdtorp
)
570 tree binfo
= lookup_base (fixed_type
, basetype
,
571 ba_unique
| ba_quiet
, NULL
);
573 vtbl
= unshare_expr (BINFO_VTABLE (binfo
));
577 vtbl
= build_vfield_ref (instance
, basetype
);
579 assemble_external (vtbl
);
581 aref
= build_array_ref (vtbl
, idx
);
582 TREE_CONSTANT (aref
) |= TREE_CONSTANT (vtbl
) && TREE_CONSTANT (idx
);
583 TREE_INVARIANT (aref
) = TREE_CONSTANT (aref
);
589 build_vtbl_ref (tree instance
, tree idx
)
591 tree aref
= build_vtbl_ref_1 (instance
, idx
);
596 /* Given a stable object pointer INSTANCE_PTR, return an expression which
597 yields a function pointer corresponding to vtable element INDEX. */
600 build_vfn_ref (tree instance_ptr
, tree idx
)
604 aref
= build_vtbl_ref_1 (build_indirect_ref (instance_ptr
, 0), idx
);
606 /* When using function descriptors, the address of the
607 vtable entry is treated as a function pointer. */
608 if (TARGET_VTABLE_USES_DESCRIPTORS
)
609 aref
= build1 (NOP_EXPR
, TREE_TYPE (aref
),
610 build_unary_op (ADDR_EXPR
, aref
, /*noconvert=*/1));
612 /* Remember this as a method reference, for later devirtualization. */
613 aref
= build3 (OBJ_TYPE_REF
, TREE_TYPE (aref
), aref
, instance_ptr
, idx
);
618 /* Return the name of the virtual function table (as an IDENTIFIER_NODE)
619 for the given TYPE. */
622 get_vtable_name (tree type
)
624 return mangle_vtbl_for_type (type
);
627 /* Return an IDENTIFIER_NODE for the name of the virtual table table
631 get_vtt_name (tree type
)
633 return mangle_vtt_for_type (type
);
636 /* DECL is an entity associated with TYPE, like a virtual table or an
637 implicitly generated constructor. Determine whether or not DECL
638 should have external or internal linkage at the object file
639 level. This routine does not deal with COMDAT linkage and other
640 similar complexities; it simply sets TREE_PUBLIC if it possible for
641 entities in other translation units to contain copies of DECL, in
645 set_linkage_according_to_type (tree type
, tree decl
)
647 /* If TYPE involves a local class in a function with internal
648 linkage, then DECL should have internal linkage too. Other local
649 classes have no linkage -- but if their containing functions
650 have external linkage, it makes sense for DECL to have external
651 linkage too. That will allow template definitions to be merged,
653 if (no_linkage_check (type
, /*relaxed_p=*/true))
655 TREE_PUBLIC (decl
) = 0;
656 DECL_INTERFACE_KNOWN (decl
) = 1;
659 TREE_PUBLIC (decl
) = 1;
662 /* Create a VAR_DECL for a primary or secondary vtable for CLASS_TYPE.
663 (For a secondary vtable for B-in-D, CLASS_TYPE should be D, not B.)
664 Use NAME for the name of the vtable, and VTABLE_TYPE for its type. */
667 build_vtable (tree class_type
, tree name
, tree vtable_type
)
671 decl
= build_lang_decl (VAR_DECL
, name
, vtable_type
);
672 /* vtable names are already mangled; give them their DECL_ASSEMBLER_NAME
673 now to avoid confusion in mangle_decl. */
674 SET_DECL_ASSEMBLER_NAME (decl
, name
);
675 DECL_CONTEXT (decl
) = class_type
;
676 DECL_ARTIFICIAL (decl
) = 1;
677 TREE_STATIC (decl
) = 1;
678 TREE_READONLY (decl
) = 1;
679 DECL_VIRTUAL_P (decl
) = 1;
680 DECL_ALIGN (decl
) = TARGET_VTABLE_ENTRY_ALIGN
;
681 DECL_VTABLE_OR_VTT_P (decl
) = 1;
682 /* At one time the vtable info was grabbed 2 words at a time. This
683 fails on sparc unless you have 8-byte alignment. (tiemann) */
684 DECL_ALIGN (decl
) = MAX (TYPE_ALIGN (double_type_node
),
686 set_linkage_according_to_type (class_type
, decl
);
687 /* The vtable has not been defined -- yet. */
688 DECL_EXTERNAL (decl
) = 1;
689 DECL_NOT_REALLY_EXTERN (decl
) = 1;
691 /* Mark the VAR_DECL node representing the vtable itself as a
692 "gratuitous" one, thereby forcing dwarfout.c to ignore it. It
693 is rather important that such things be ignored because any
694 effort to actually generate DWARF for them will run into
695 trouble when/if we encounter code like:
698 struct S { virtual void member (); };
700 because the artificial declaration of the vtable itself (as
701 manufactured by the g++ front end) will say that the vtable is
702 a static member of `S' but only *after* the debug output for
703 the definition of `S' has already been output. This causes
704 grief because the DWARF entry for the definition of the vtable
705 will try to refer back to an earlier *declaration* of the
706 vtable as a static member of `S' and there won't be one. We
707 might be able to arrange to have the "vtable static member"
708 attached to the member list for `S' before the debug info for
709 `S' get written (which would solve the problem) but that would
710 require more intrusive changes to the g++ front end. */
711 DECL_IGNORED_P (decl
) = 1;
716 /* Get the VAR_DECL of the vtable for TYPE. TYPE need not be polymorphic,
717 or even complete. If this does not exist, create it. If COMPLETE is
718 nonzero, then complete the definition of it -- that will render it
719 impossible to actually build the vtable, but is useful to get at those
720 which are known to exist in the runtime. */
723 get_vtable_decl (tree type
, int complete
)
727 if (CLASSTYPE_VTABLES (type
))
728 return CLASSTYPE_VTABLES (type
);
730 decl
= build_vtable (type
, get_vtable_name (type
), vtbl_type_node
);
731 CLASSTYPE_VTABLES (type
) = decl
;
735 DECL_EXTERNAL (decl
) = 1;
736 cp_finish_decl (decl
, NULL_TREE
, NULL_TREE
, 0);
742 /* Build the primary virtual function table for TYPE. If BINFO is
743 non-NULL, build the vtable starting with the initial approximation
744 that it is the same as the one which is the head of the association
745 list. Returns a nonzero value if a new vtable is actually
749 build_primary_vtable (tree binfo
, tree type
)
754 decl
= get_vtable_decl (type
, /*complete=*/0);
758 if (BINFO_NEW_VTABLE_MARKED (binfo
))
759 /* We have already created a vtable for this base, so there's
760 no need to do it again. */
763 virtuals
= copy_list (BINFO_VIRTUALS (binfo
));
764 TREE_TYPE (decl
) = TREE_TYPE (get_vtbl_decl_for_binfo (binfo
));
765 DECL_SIZE (decl
) = TYPE_SIZE (TREE_TYPE (decl
));
766 DECL_SIZE_UNIT (decl
) = TYPE_SIZE_UNIT (TREE_TYPE (decl
));
770 gcc_assert (TREE_TYPE (decl
) == vtbl_type_node
);
771 virtuals
= NULL_TREE
;
774 #ifdef GATHER_STATISTICS
776 n_vtable_elems
+= list_length (virtuals
);
779 /* Initialize the association list for this type, based
780 on our first approximation. */
781 BINFO_VTABLE (TYPE_BINFO (type
)) = decl
;
782 BINFO_VIRTUALS (TYPE_BINFO (type
)) = virtuals
;
783 SET_BINFO_NEW_VTABLE_MARKED (TYPE_BINFO (type
));
787 /* Give BINFO a new virtual function table which is initialized
788 with a skeleton-copy of its original initialization. The only
789 entry that changes is the `delta' entry, so we can really
790 share a lot of structure.
792 FOR_TYPE is the most derived type which caused this table to
795 Returns nonzero if we haven't met BINFO before.
797 The order in which vtables are built (by calling this function) for
798 an object must remain the same, otherwise a binary incompatibility
802 build_secondary_vtable (tree binfo
)
804 if (BINFO_NEW_VTABLE_MARKED (binfo
))
805 /* We already created a vtable for this base. There's no need to
809 /* Remember that we've created a vtable for this BINFO, so that we
810 don't try to do so again. */
811 SET_BINFO_NEW_VTABLE_MARKED (binfo
);
813 /* Make fresh virtual list, so we can smash it later. */
814 BINFO_VIRTUALS (binfo
) = copy_list (BINFO_VIRTUALS (binfo
));
816 /* Secondary vtables are laid out as part of the same structure as
817 the primary vtable. */
818 BINFO_VTABLE (binfo
) = NULL_TREE
;
822 /* Create a new vtable for BINFO which is the hierarchy dominated by
823 T. Return nonzero if we actually created a new vtable. */
826 make_new_vtable (tree t
, tree binfo
)
828 if (binfo
== TYPE_BINFO (t
))
829 /* In this case, it is *type*'s vtable we are modifying. We start
830 with the approximation that its vtable is that of the
831 immediate base class. */
832 return build_primary_vtable (binfo
, t
);
834 /* This is our very own copy of `basetype' to play with. Later,
835 we will fill in all the virtual functions that override the
836 virtual functions in these base classes which are not defined
837 by the current type. */
838 return build_secondary_vtable (binfo
);
841 /* Make *VIRTUALS, an entry on the BINFO_VIRTUALS list for BINFO
842 (which is in the hierarchy dominated by T) list FNDECL as its
843 BV_FN. DELTA is the required constant adjustment from the `this'
844 pointer where the vtable entry appears to the `this' required when
845 the function is actually called. */
848 modify_vtable_entry (tree t
,
858 if (fndecl
!= BV_FN (v
)
859 || !tree_int_cst_equal (delta
, BV_DELTA (v
)))
861 /* We need a new vtable for BINFO. */
862 if (make_new_vtable (t
, binfo
))
864 /* If we really did make a new vtable, we also made a copy
865 of the BINFO_VIRTUALS list. Now, we have to find the
866 corresponding entry in that list. */
867 *virtuals
= BINFO_VIRTUALS (binfo
);
868 while (BV_FN (*virtuals
) != BV_FN (v
))
869 *virtuals
= TREE_CHAIN (*virtuals
);
873 BV_DELTA (v
) = delta
;
874 BV_VCALL_INDEX (v
) = NULL_TREE
;
880 /* Add method METHOD to class TYPE. */
883 add_method (tree type
, tree method
)
888 bool template_conv_p
= false;
890 VEC(tree
) *method_vec
;
892 bool insert_p
= false;
895 if (method
== error_mark_node
)
898 complete_p
= COMPLETE_TYPE_P (type
);
899 using = (DECL_CONTEXT (method
) != type
);
900 conv_p
= DECL_CONV_FN_P (method
);
902 template_conv_p
= (TREE_CODE (method
) == TEMPLATE_DECL
903 && DECL_TEMPLATE_CONV_FN_P (method
));
905 method_vec
= CLASSTYPE_METHOD_VEC (type
);
908 /* Make a new method vector. We start with 8 entries. We must
909 allocate at least two (for constructors and destructors), and
910 we're going to end up with an assignment operator at some
912 method_vec
= VEC_alloc (tree
, 8);
913 /* Create slots for constructors and destructors. */
914 VEC_quick_push (tree
, method_vec
, NULL_TREE
);
915 VEC_quick_push (tree
, method_vec
, NULL_TREE
);
916 CLASSTYPE_METHOD_VEC (type
) = method_vec
;
919 /* Constructors and destructors go in special slots. */
920 if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (method
))
921 slot
= CLASSTYPE_CONSTRUCTOR_SLOT
;
922 else if (DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P (method
))
924 slot
= CLASSTYPE_DESTRUCTOR_SLOT
;
926 if (TYPE_FOR_JAVA (type
))
928 if (!DECL_ARTIFICIAL (method
))
929 error ("Java class %qT cannot have a destructor", type
);
930 else if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type
))
931 error ("Java class %qT cannot have an implicit non-trivial "
941 /* See if we already have an entry with this name. */
942 for (slot
= CLASSTYPE_FIRST_CONVERSION_SLOT
;
943 VEC_iterate (tree
, method_vec
, slot
, m
);
949 if (TREE_CODE (m
) == TEMPLATE_DECL
950 && DECL_TEMPLATE_CONV_FN_P (m
))
954 if (conv_p
&& !DECL_CONV_FN_P (m
))
956 if (DECL_NAME (m
) == DECL_NAME (method
))
962 && !DECL_CONV_FN_P (m
)
963 && DECL_NAME (m
) > DECL_NAME (method
))
967 current_fns
= insert_p
? NULL_TREE
: VEC_index (tree
, method_vec
, slot
);
969 if (processing_template_decl
)
970 /* TYPE is a template class. Don't issue any errors now; wait
971 until instantiation time to complain. */
977 /* Check to see if we've already got this method. */
978 for (fns
= current_fns
; fns
; fns
= OVL_NEXT (fns
))
980 tree fn
= OVL_CURRENT (fns
);
985 if (TREE_CODE (fn
) != TREE_CODE (method
))
988 /* [over.load] Member function declarations with the
989 same name and the same parameter types cannot be
990 overloaded if any of them is a static member
991 function declaration.
993 [namespace.udecl] When a using-declaration brings names
994 from a base class into a derived class scope, member
995 functions in the derived class override and/or hide member
996 functions with the same name and parameter types in a base
997 class (rather than conflicting). */
998 parms1
= TYPE_ARG_TYPES (TREE_TYPE (fn
));
999 parms2
= TYPE_ARG_TYPES (TREE_TYPE (method
));
1001 /* Compare the quals on the 'this' parm. Don't compare
1002 the whole types, as used functions are treated as
1003 coming from the using class in overload resolution. */
1004 if (! DECL_STATIC_FUNCTION_P (fn
)
1005 && ! DECL_STATIC_FUNCTION_P (method
)
1006 && (TYPE_QUALS (TREE_TYPE (TREE_VALUE (parms1
)))
1007 != TYPE_QUALS (TREE_TYPE (TREE_VALUE (parms2
)))))
1010 /* For templates, the template parms must be identical. */
1011 if (TREE_CODE (fn
) == TEMPLATE_DECL
1012 && !comp_template_parms (DECL_TEMPLATE_PARMS (fn
),
1013 DECL_TEMPLATE_PARMS (method
)))
1016 if (! DECL_STATIC_FUNCTION_P (fn
))
1017 parms1
= TREE_CHAIN (parms1
);
1018 if (! DECL_STATIC_FUNCTION_P (method
))
1019 parms2
= TREE_CHAIN (parms2
);
1021 if (same
&& compparms (parms1
, parms2
)
1022 && (!DECL_CONV_FN_P (fn
)
1023 || same_type_p (TREE_TYPE (TREE_TYPE (fn
)),
1024 TREE_TYPE (TREE_TYPE (method
)))))
1026 if (using && DECL_CONTEXT (fn
) == type
)
1027 /* Defer to the local function. */
1031 cp_error_at ("%q#D and %q#D cannot be overloaded",
1034 /* We don't call duplicate_decls here to merge
1035 the declarations because that will confuse
1036 things if the methods have inline
1037 definitions. In particular, we will crash
1038 while processing the definitions. */
1045 /* Add the new binding. */
1046 overload
= build_overload (method
, current_fns
);
1048 if (!conv_p
&& slot
>= CLASSTYPE_FIRST_CONVERSION_SLOT
&& !complete_p
)
1049 push_class_level_binding (DECL_NAME (method
), overload
);
1053 /* We only expect to add few methods in the COMPLETE_P case, so
1054 just make room for one more method in that case. */
1055 if (VEC_reserve (tree
, method_vec
, complete_p
? 1 : -1))
1056 CLASSTYPE_METHOD_VEC (type
) = method_vec
;
1057 if (slot
== VEC_length (tree
, method_vec
))
1058 VEC_quick_push (tree
, method_vec
, overload
);
1060 VEC_quick_insert (tree
, method_vec
, slot
, overload
);
1063 /* Replace the current slot. */
1064 VEC_replace (tree
, method_vec
, slot
, overload
);
1067 /* Subroutines of finish_struct. */
1069 /* Change the access of FDECL to ACCESS in T. Return 1 if change was
1070 legit, otherwise return 0. */
1073 alter_access (tree t
, tree fdecl
, tree access
)
1077 if (!DECL_LANG_SPECIFIC (fdecl
))
1078 retrofit_lang_decl (fdecl
);
1080 gcc_assert (!DECL_DISCRIMINATOR_P (fdecl
));
1082 elem
= purpose_member (t
, DECL_ACCESS (fdecl
));
1085 if (TREE_VALUE (elem
) != access
)
1087 if (TREE_CODE (TREE_TYPE (fdecl
)) == FUNCTION_DECL
)
1088 cp_error_at ("conflicting access specifications for method"
1089 " %qD, ignored", TREE_TYPE (fdecl
));
1091 error ("conflicting access specifications for field %qE, ignored",
1096 /* They're changing the access to the same thing they changed
1097 it to before. That's OK. */
1103 perform_or_defer_access_check (TYPE_BINFO (t
), fdecl
);
1104 DECL_ACCESS (fdecl
) = tree_cons (t
, access
, DECL_ACCESS (fdecl
));
1110 /* Process the USING_DECL, which is a member of T. */
1113 handle_using_decl (tree using_decl
, tree t
)
1115 tree ctype
= DECL_INITIAL (using_decl
);
1116 tree name
= DECL_NAME (using_decl
);
1118 = TREE_PRIVATE (using_decl
) ? access_private_node
1119 : TREE_PROTECTED (using_decl
) ? access_protected_node
1120 : access_public_node
;
1122 tree flist
= NULL_TREE
;
1125 if (ctype
== error_mark_node
)
1128 binfo
= lookup_base (t
, ctype
, ba_any
, NULL
);
1131 location_t saved_loc
= input_location
;
1133 input_location
= DECL_SOURCE_LOCATION (using_decl
);
1134 error_not_base_type (ctype
, t
);
1135 input_location
= saved_loc
;
1139 if (constructor_name_p (name
, ctype
))
1141 cp_error_at ("%qD names constructor", using_decl
);
1144 if (constructor_name_p (name
, t
))
1146 cp_error_at ("%qD invalid in %qT", using_decl
, t
);
1150 fdecl
= lookup_member (binfo
, name
, 0, false);
1154 cp_error_at ("no members matching %qD in %q#T", using_decl
, ctype
);
1158 if (BASELINK_P (fdecl
))
1159 /* Ignore base type this came from. */
1160 fdecl
= BASELINK_FUNCTIONS (fdecl
);
1162 old_value
= lookup_member (t
, name
, /*protect=*/0, /*want_type=*/false);
1165 if (is_overloaded_fn (old_value
))
1166 old_value
= OVL_CURRENT (old_value
);
1168 if (DECL_P (old_value
) && DECL_CONTEXT (old_value
) == t
)
1171 old_value
= NULL_TREE
;
1174 if (is_overloaded_fn (fdecl
))
1179 else if (is_overloaded_fn (old_value
))
1182 /* It's OK to use functions from a base when there are functions with
1183 the same name already present in the current class. */;
1186 cp_error_at ("%qD invalid in %q#T", using_decl
, t
);
1187 cp_error_at (" because of local method %q#D with same name",
1188 OVL_CURRENT (old_value
));
1192 else if (!DECL_ARTIFICIAL (old_value
))
1194 cp_error_at ("%qD invalid in %q#T", using_decl
, t
);
1195 cp_error_at (" because of local member %q#D with same name", old_value
);
1199 /* Make type T see field decl FDECL with access ACCESS. */
1201 for (; flist
; flist
= OVL_NEXT (flist
))
1203 add_method (t
, OVL_CURRENT (flist
));
1204 alter_access (t
, OVL_CURRENT (flist
), access
);
1207 alter_access (t
, fdecl
, access
);
1210 /* Run through the base classes of T, updating CANT_HAVE_CONST_CTOR_P,
1211 and NO_CONST_ASN_REF_P. Also set flag bits in T based on
1212 properties of the bases. */
1215 check_bases (tree t
,
1216 int* cant_have_const_ctor_p
,
1217 int* no_const_asn_ref_p
)
1220 int seen_non_virtual_nearly_empty_base_p
;
1224 seen_non_virtual_nearly_empty_base_p
= 0;
1226 for (binfo
= TYPE_BINFO (t
), i
= 0;
1227 BINFO_BASE_ITERATE (binfo
, i
, base_binfo
); i
++)
1229 tree basetype
= TREE_TYPE (base_binfo
);
1231 gcc_assert (COMPLETE_TYPE_P (basetype
));
1233 /* Effective C++ rule 14. We only need to check TYPE_POLYMORPHIC_P
1234 here because the case of virtual functions but non-virtual
1235 dtor is handled in finish_struct_1. */
1236 if (warn_ecpp
&& ! TYPE_POLYMORPHIC_P (basetype
))
1237 warning ("base class %q#T has a non-virtual destructor", basetype
);
1239 /* If the base class doesn't have copy constructors or
1240 assignment operators that take const references, then the
1241 derived class cannot have such a member automatically
1243 if (! TYPE_HAS_CONST_INIT_REF (basetype
))
1244 *cant_have_const_ctor_p
= 1;
1245 if (TYPE_HAS_ASSIGN_REF (basetype
)
1246 && !TYPE_HAS_CONST_ASSIGN_REF (basetype
))
1247 *no_const_asn_ref_p
= 1;
1249 if (BINFO_VIRTUAL_P (base_binfo
))
1250 /* A virtual base does not effect nearly emptiness. */
1252 else if (CLASSTYPE_NEARLY_EMPTY_P (basetype
))
1254 if (seen_non_virtual_nearly_empty_base_p
)
1255 /* And if there is more than one nearly empty base, then the
1256 derived class is not nearly empty either. */
1257 CLASSTYPE_NEARLY_EMPTY_P (t
) = 0;
1259 /* Remember we've seen one. */
1260 seen_non_virtual_nearly_empty_base_p
= 1;
1262 else if (!is_empty_class (basetype
))
1263 /* If the base class is not empty or nearly empty, then this
1264 class cannot be nearly empty. */
1265 CLASSTYPE_NEARLY_EMPTY_P (t
) = 0;
1267 /* A lot of properties from the bases also apply to the derived
1269 TYPE_NEEDS_CONSTRUCTING (t
) |= TYPE_NEEDS_CONSTRUCTING (basetype
);
1270 TYPE_HAS_NONTRIVIAL_DESTRUCTOR (t
)
1271 |= TYPE_HAS_NONTRIVIAL_DESTRUCTOR (basetype
);
1272 TYPE_HAS_COMPLEX_ASSIGN_REF (t
)
1273 |= TYPE_HAS_COMPLEX_ASSIGN_REF (basetype
);
1274 TYPE_HAS_COMPLEX_INIT_REF (t
) |= TYPE_HAS_COMPLEX_INIT_REF (basetype
);
1275 TYPE_POLYMORPHIC_P (t
) |= TYPE_POLYMORPHIC_P (basetype
);
1276 CLASSTYPE_CONTAINS_EMPTY_CLASS_P (t
)
1277 |= CLASSTYPE_CONTAINS_EMPTY_CLASS_P (basetype
);
1281 /* Determine all the primary bases within T. Sets BINFO_PRIMARY_BASE_P for
1282 those that are primaries. Sets BINFO_LOST_PRIMARY_P for those
1283 that have had a nearly-empty virtual primary base stolen by some
1284 other base in the hierarchy. Determines CLASSTYPE_PRIMARY_BASE for
1288 determine_primary_bases (tree t
)
1291 tree primary
= NULL_TREE
;
1292 tree type_binfo
= TYPE_BINFO (t
);
1295 /* Determine the primary bases of our bases. */
1296 for (base_binfo
= TREE_CHAIN (type_binfo
); base_binfo
;
1297 base_binfo
= TREE_CHAIN (base_binfo
))
1299 tree primary
= CLASSTYPE_PRIMARY_BINFO (BINFO_TYPE (base_binfo
));
1301 /* See if we're the non-virtual primary of our inheritance
1303 if (!BINFO_VIRTUAL_P (base_binfo
))
1305 tree parent
= BINFO_INHERITANCE_CHAIN (base_binfo
);
1306 tree parent_primary
= CLASSTYPE_PRIMARY_BINFO (BINFO_TYPE (parent
));
1309 && SAME_BINFO_TYPE_P (BINFO_TYPE (base_binfo
),
1310 BINFO_TYPE (parent_primary
)))
1311 /* We are the primary binfo. */
1312 BINFO_PRIMARY_P (base_binfo
) = 1;
1314 /* Determine if we have a virtual primary base, and mark it so.
1316 if (primary
&& BINFO_VIRTUAL_P (primary
))
1318 tree this_primary
= copied_binfo (primary
, base_binfo
);
1320 if (BINFO_PRIMARY_P (this_primary
))
1321 /* Someone already claimed this base. */
1322 BINFO_LOST_PRIMARY_P (base_binfo
) = 1;
1327 BINFO_PRIMARY_P (this_primary
) = 1;
1328 BINFO_INHERITANCE_CHAIN (this_primary
) = base_binfo
;
1330 /* A virtual binfo might have been copied from within
1331 another hierarchy. As we're about to use it as a
1332 primary base, make sure the offsets match. */
1333 delta
= size_diffop (convert (ssizetype
,
1334 BINFO_OFFSET (base_binfo
)),
1336 BINFO_OFFSET (this_primary
)));
1338 propagate_binfo_offsets (this_primary
, delta
);
1343 /* First look for a dynamic direct non-virtual base. */
1344 for (i
= 0; BINFO_BASE_ITERATE (type_binfo
, i
, base_binfo
); i
++)
1346 tree basetype
= BINFO_TYPE (base_binfo
);
1348 if (TYPE_CONTAINS_VPTR_P (basetype
) && !BINFO_VIRTUAL_P (base_binfo
))
1350 primary
= base_binfo
;
1355 /* A "nearly-empty" virtual base class can be the primary base
1356 class, if no non-virtual polymorphic base can be found. Look for
1357 a nearly-empty virtual dynamic base that is not already a primary
1358 base of something in the hierarchy. If there is no such base,
1359 just pick the first nearly-empty virtual base. */
1361 for (base_binfo
= TREE_CHAIN (type_binfo
); base_binfo
;
1362 base_binfo
= TREE_CHAIN (base_binfo
))
1363 if (BINFO_VIRTUAL_P (base_binfo
)
1364 && CLASSTYPE_NEARLY_EMPTY_P (BINFO_TYPE (base_binfo
)))
1366 if (!BINFO_PRIMARY_P (base_binfo
))
1368 /* Found one that is not primary. */
1369 primary
= base_binfo
;
1373 /* Remember the first candidate. */
1374 primary
= base_binfo
;
1378 /* If we've got a primary base, use it. */
1381 tree basetype
= BINFO_TYPE (primary
);
1383 CLASSTYPE_PRIMARY_BINFO (t
) = primary
;
1384 if (BINFO_PRIMARY_P (primary
))
1385 /* We are stealing a primary base. */
1386 BINFO_LOST_PRIMARY_P (BINFO_INHERITANCE_CHAIN (primary
)) = 1;
1387 BINFO_PRIMARY_P (primary
) = 1;
1388 if (BINFO_VIRTUAL_P (primary
))
1392 BINFO_INHERITANCE_CHAIN (primary
) = type_binfo
;
1393 /* A virtual binfo might have been copied from within
1394 another hierarchy. As we're about to use it as a primary
1395 base, make sure the offsets match. */
1396 delta
= size_diffop (ssize_int (0),
1397 convert (ssizetype
, BINFO_OFFSET (primary
)));
1399 propagate_binfo_offsets (primary
, delta
);
1402 primary
= TYPE_BINFO (basetype
);
1404 TYPE_VFIELD (t
) = TYPE_VFIELD (basetype
);
1405 BINFO_VTABLE (type_binfo
) = BINFO_VTABLE (primary
);
1406 BINFO_VIRTUALS (type_binfo
) = BINFO_VIRTUALS (primary
);
1410 /* Set memoizing fields and bits of T (and its variants) for later
1414 finish_struct_bits (tree t
)
1418 /* Fix up variants (if any). */
1419 for (variants
= TYPE_NEXT_VARIANT (t
);
1421 variants
= TYPE_NEXT_VARIANT (variants
))
1423 /* These fields are in the _TYPE part of the node, not in
1424 the TYPE_LANG_SPECIFIC component, so they are not shared. */
1425 TYPE_HAS_CONSTRUCTOR (variants
) = TYPE_HAS_CONSTRUCTOR (t
);
1426 TYPE_NEEDS_CONSTRUCTING (variants
) = TYPE_NEEDS_CONSTRUCTING (t
);
1427 TYPE_HAS_NONTRIVIAL_DESTRUCTOR (variants
)
1428 = TYPE_HAS_NONTRIVIAL_DESTRUCTOR (t
);
1430 TYPE_POLYMORPHIC_P (variants
) = TYPE_POLYMORPHIC_P (t
);
1432 TYPE_BINFO (variants
) = TYPE_BINFO (t
);
1434 /* Copy whatever these are holding today. */
1435 TYPE_VFIELD (variants
) = TYPE_VFIELD (t
);
1436 TYPE_METHODS (variants
) = TYPE_METHODS (t
);
1437 TYPE_FIELDS (variants
) = TYPE_FIELDS (t
);
1438 TYPE_SIZE (variants
) = TYPE_SIZE (t
);
1439 TYPE_SIZE_UNIT (variants
) = TYPE_SIZE_UNIT (t
);
1442 if (BINFO_N_BASE_BINFOS (TYPE_BINFO (t
)) && TYPE_POLYMORPHIC_P (t
))
1443 /* For a class w/o baseclasses, 'finish_struct' has set
1444 CLASSTYPE_PURE_VIRTUALS correctly (by definition).
1445 Similarly for a class whose base classes do not have vtables.
1446 When neither of these is true, we might have removed abstract
1447 virtuals (by providing a definition), added some (by declaring
1448 new ones), or redeclared ones from a base class. We need to
1449 recalculate what's really an abstract virtual at this point (by
1450 looking in the vtables). */
1451 get_pure_virtuals (t
);
1453 /* If this type has a copy constructor or a destructor, force its
1454 mode to be BLKmode, and force its TREE_ADDRESSABLE bit to be
1455 nonzero. This will cause it to be passed by invisible reference
1456 and prevent it from being returned in a register. */
1457 if (! TYPE_HAS_TRIVIAL_INIT_REF (t
) || TYPE_HAS_NONTRIVIAL_DESTRUCTOR (t
))
1460 DECL_MODE (TYPE_MAIN_DECL (t
)) = BLKmode
;
1461 for (variants
= t
; variants
; variants
= TYPE_NEXT_VARIANT (variants
))
1463 TYPE_MODE (variants
) = BLKmode
;
1464 TREE_ADDRESSABLE (variants
) = 1;
1469 /* Issue warnings about T having private constructors, but no friends,
1472 HAS_NONPRIVATE_METHOD is nonzero if T has any non-private methods or
1473 static members. HAS_NONPRIVATE_STATIC_FN is nonzero if T has any
1474 non-private static member functions. */
1477 maybe_warn_about_overly_private_class (tree t
)
1479 int has_member_fn
= 0;
1480 int has_nonprivate_method
= 0;
1483 if (!warn_ctor_dtor_privacy
1484 /* If the class has friends, those entities might create and
1485 access instances, so we should not warn. */
1486 || (CLASSTYPE_FRIEND_CLASSES (t
)
1487 || DECL_FRIENDLIST (TYPE_MAIN_DECL (t
)))
1488 /* We will have warned when the template was declared; there's
1489 no need to warn on every instantiation. */
1490 || CLASSTYPE_TEMPLATE_INSTANTIATION (t
))
1491 /* There's no reason to even consider warning about this
1495 /* We only issue one warning, if more than one applies, because
1496 otherwise, on code like:
1499 // Oops - forgot `public:'
1505 we warn several times about essentially the same problem. */
1507 /* Check to see if all (non-constructor, non-destructor) member
1508 functions are private. (Since there are no friends or
1509 non-private statics, we can't ever call any of the private member
1511 for (fn
= TYPE_METHODS (t
); fn
; fn
= TREE_CHAIN (fn
))
1512 /* We're not interested in compiler-generated methods; they don't
1513 provide any way to call private members. */
1514 if (!DECL_ARTIFICIAL (fn
))
1516 if (!TREE_PRIVATE (fn
))
1518 if (DECL_STATIC_FUNCTION_P (fn
))
1519 /* A non-private static member function is just like a
1520 friend; it can create and invoke private member
1521 functions, and be accessed without a class
1525 has_nonprivate_method
= 1;
1526 /* Keep searching for a static member function. */
1528 else if (!DECL_CONSTRUCTOR_P (fn
) && !DECL_DESTRUCTOR_P (fn
))
1532 if (!has_nonprivate_method
&& has_member_fn
)
1534 /* There are no non-private methods, and there's at least one
1535 private member function that isn't a constructor or
1536 destructor. (If all the private members are
1537 constructors/destructors we want to use the code below that
1538 issues error messages specifically referring to
1539 constructors/destructors.) */
1541 tree binfo
= TYPE_BINFO (t
);
1543 for (i
= 0; i
!= BINFO_N_BASE_BINFOS (binfo
); i
++)
1544 if (BINFO_BASE_ACCESS (binfo
, i
) != access_private_node
)
1546 has_nonprivate_method
= 1;
1549 if (!has_nonprivate_method
)
1551 warning ("all member functions in class %qT are private", t
);
1556 /* Even if some of the member functions are non-private, the class
1557 won't be useful for much if all the constructors or destructors
1558 are private: such an object can never be created or destroyed. */
1559 fn
= CLASSTYPE_DESTRUCTORS (t
);
1560 if (fn
&& TREE_PRIVATE (fn
))
1562 warning ("%q#T only defines a private destructor and has no friends",
1567 if (TYPE_HAS_CONSTRUCTOR (t
))
1569 int nonprivate_ctor
= 0;
1571 /* If a non-template class does not define a copy
1572 constructor, one is defined for it, enabling it to avoid
1573 this warning. For a template class, this does not
1574 happen, and so we would normally get a warning on:
1576 template <class T> class C { private: C(); };
1578 To avoid this asymmetry, we check TYPE_HAS_INIT_REF. All
1579 complete non-template or fully instantiated classes have this
1581 if (!TYPE_HAS_INIT_REF (t
))
1582 nonprivate_ctor
= 1;
1584 for (fn
= CLASSTYPE_CONSTRUCTORS (t
); fn
; fn
= OVL_NEXT (fn
))
1586 tree ctor
= OVL_CURRENT (fn
);
1587 /* Ideally, we wouldn't count copy constructors (or, in
1588 fact, any constructor that takes an argument of the
1589 class type as a parameter) because such things cannot
1590 be used to construct an instance of the class unless
1591 you already have one. But, for now at least, we're
1593 if (! TREE_PRIVATE (ctor
))
1595 nonprivate_ctor
= 1;
1600 if (nonprivate_ctor
== 0)
1602 warning ("%q#T only defines private constructors and has no friends",
1610 gt_pointer_operator new_value
;
1614 /* Comparison function to compare two TYPE_METHOD_VEC entries by name. */
1617 method_name_cmp (const void* m1_p
, const void* m2_p
)
1619 const tree
*const m1
= m1_p
;
1620 const tree
*const m2
= m2_p
;
1622 if (*m1
== NULL_TREE
&& *m2
== NULL_TREE
)
1624 if (*m1
== NULL_TREE
)
1626 if (*m2
== NULL_TREE
)
1628 if (DECL_NAME (OVL_CURRENT (*m1
)) < DECL_NAME (OVL_CURRENT (*m2
)))
1633 /* This routine compares two fields like method_name_cmp but using the
1634 pointer operator in resort_field_decl_data. */
1637 resort_method_name_cmp (const void* m1_p
, const void* m2_p
)
1639 const tree
*const m1
= m1_p
;
1640 const tree
*const m2
= m2_p
;
1641 if (*m1
== NULL_TREE
&& *m2
== NULL_TREE
)
1643 if (*m1
== NULL_TREE
)
1645 if (*m2
== NULL_TREE
)
1648 tree d1
= DECL_NAME (OVL_CURRENT (*m1
));
1649 tree d2
= DECL_NAME (OVL_CURRENT (*m2
));
1650 resort_data
.new_value (&d1
, resort_data
.cookie
);
1651 resort_data
.new_value (&d2
, resort_data
.cookie
);
1658 /* Resort TYPE_METHOD_VEC because pointers have been reordered. */
1661 resort_type_method_vec (void* obj
,
1662 void* orig_obj ATTRIBUTE_UNUSED
,
1663 gt_pointer_operator new_value
,
1666 VEC(tree
) *method_vec
= (VEC(tree
) *) obj
;
1667 int len
= VEC_length (tree
, method_vec
);
1671 /* The type conversion ops have to live at the front of the vec, so we
1673 for (slot
= CLASSTYPE_FIRST_CONVERSION_SLOT
;
1674 VEC_iterate (tree
, method_vec
, slot
, fn
);
1676 if (!DECL_CONV_FN_P (OVL_CURRENT (fn
)))
1681 resort_data
.new_value
= new_value
;
1682 resort_data
.cookie
= cookie
;
1683 qsort (VEC_address (tree
, method_vec
) + slot
, len
- slot
, sizeof (tree
),
1684 resort_method_name_cmp
);
1688 /* Warn about duplicate methods in fn_fields.
1690 Sort methods that are not special (i.e., constructors, destructors,
1691 and type conversion operators) so that we can find them faster in
1695 finish_struct_methods (tree t
)
1698 VEC(tree
) *method_vec
;
1701 method_vec
= CLASSTYPE_METHOD_VEC (t
);
1705 len
= VEC_length (tree
, method_vec
);
1707 /* Clear DECL_IN_AGGR_P for all functions. */
1708 for (fn_fields
= TYPE_METHODS (t
); fn_fields
;
1709 fn_fields
= TREE_CHAIN (fn_fields
))
1710 DECL_IN_AGGR_P (fn_fields
) = 0;
1712 /* Issue warnings about private constructors and such. If there are
1713 no methods, then some public defaults are generated. */
1714 maybe_warn_about_overly_private_class (t
);
1716 /* The type conversion ops have to live at the front of the vec, so we
1718 for (slot
= CLASSTYPE_FIRST_CONVERSION_SLOT
;
1719 VEC_iterate (tree
, method_vec
, slot
, fn_fields
);
1721 if (!DECL_CONV_FN_P (OVL_CURRENT (fn_fields
)))
1724 qsort (VEC_address (tree
, method_vec
) + slot
,
1725 len
-slot
, sizeof (tree
), method_name_cmp
);
1728 /* Make BINFO's vtable have N entries, including RTTI entries,
1729 vbase and vcall offsets, etc. Set its type and call the backend
1733 layout_vtable_decl (tree binfo
, int n
)
1738 atype
= build_cplus_array_type (vtable_entry_type
,
1739 build_index_type (size_int (n
- 1)));
1740 layout_type (atype
);
1742 /* We may have to grow the vtable. */
1743 vtable
= get_vtbl_decl_for_binfo (binfo
);
1744 if (!same_type_p (TREE_TYPE (vtable
), atype
))
1746 TREE_TYPE (vtable
) = atype
;
1747 DECL_SIZE (vtable
) = DECL_SIZE_UNIT (vtable
) = NULL_TREE
;
1748 layout_decl (vtable
, 0);
1752 /* True iff FNDECL and BASE_FNDECL (both non-static member functions)
1753 have the same signature. */
1756 same_signature_p (tree fndecl
, tree base_fndecl
)
1758 /* One destructor overrides another if they are the same kind of
1760 if (DECL_DESTRUCTOR_P (base_fndecl
) && DECL_DESTRUCTOR_P (fndecl
)
1761 && special_function_p (base_fndecl
) == special_function_p (fndecl
))
1763 /* But a non-destructor never overrides a destructor, nor vice
1764 versa, nor do different kinds of destructors override
1765 one-another. For example, a complete object destructor does not
1766 override a deleting destructor. */
1767 if (DECL_DESTRUCTOR_P (base_fndecl
) || DECL_DESTRUCTOR_P (fndecl
))
1770 if (DECL_NAME (fndecl
) == DECL_NAME (base_fndecl
)
1771 || (DECL_CONV_FN_P (fndecl
)
1772 && DECL_CONV_FN_P (base_fndecl
)
1773 && same_type_p (DECL_CONV_FN_TYPE (fndecl
),
1774 DECL_CONV_FN_TYPE (base_fndecl
))))
1776 tree types
, base_types
;
1777 types
= TYPE_ARG_TYPES (TREE_TYPE (fndecl
));
1778 base_types
= TYPE_ARG_TYPES (TREE_TYPE (base_fndecl
));
1779 if ((TYPE_QUALS (TREE_TYPE (TREE_VALUE (base_types
)))
1780 == TYPE_QUALS (TREE_TYPE (TREE_VALUE (types
))))
1781 && compparms (TREE_CHAIN (base_types
), TREE_CHAIN (types
)))
1787 /* Returns TRUE if DERIVED is a binfo containing the binfo BASE as a
1791 base_derived_from (tree derived
, tree base
)
1795 for (probe
= base
; probe
; probe
= BINFO_INHERITANCE_CHAIN (probe
))
1797 if (probe
== derived
)
1799 else if (BINFO_VIRTUAL_P (probe
))
1800 /* If we meet a virtual base, we can't follow the inheritance
1801 any more. See if the complete type of DERIVED contains
1802 such a virtual base. */
1803 return (binfo_for_vbase (BINFO_TYPE (probe
), BINFO_TYPE (derived
))
1809 typedef struct find_final_overrider_data_s
{
1810 /* The function for which we are trying to find a final overrider. */
1812 /* The base class in which the function was declared. */
1813 tree declaring_base
;
1814 /* The candidate overriders. */
1816 /* Path to most derived. */
1818 } find_final_overrider_data
;
1820 /* Add the overrider along the current path to FFOD->CANDIDATES.
1821 Returns true if an overrider was found; false otherwise. */
1824 dfs_find_final_overrider_1 (tree binfo
,
1825 find_final_overrider_data
*ffod
,
1830 /* If BINFO is not the most derived type, try a more derived class.
1831 A definition there will overrider a definition here. */
1835 if (dfs_find_final_overrider_1
1836 (VEC_index (tree
, ffod
->path
, depth
), ffod
, depth
))
1840 method
= look_for_overrides_here (BINFO_TYPE (binfo
), ffod
->fn
);
1843 tree
*candidate
= &ffod
->candidates
;
1845 /* Remove any candidates overridden by this new function. */
1848 /* If *CANDIDATE overrides METHOD, then METHOD
1849 cannot override anything else on the list. */
1850 if (base_derived_from (TREE_VALUE (*candidate
), binfo
))
1852 /* If METHOD overrides *CANDIDATE, remove *CANDIDATE. */
1853 if (base_derived_from (binfo
, TREE_VALUE (*candidate
)))
1854 *candidate
= TREE_CHAIN (*candidate
);
1856 candidate
= &TREE_CHAIN (*candidate
);
1859 /* Add the new function. */
1860 ffod
->candidates
= tree_cons (method
, binfo
, ffod
->candidates
);
1867 /* Called from find_final_overrider via dfs_walk. */
1870 dfs_find_final_overrider_pre (tree binfo
, void *data
)
1872 find_final_overrider_data
*ffod
= (find_final_overrider_data
*) data
;
1874 if (binfo
== ffod
->declaring_base
)
1875 dfs_find_final_overrider_1 (binfo
, ffod
, VEC_length (tree
, ffod
->path
));
1876 VEC_safe_push (tree
, ffod
->path
, binfo
);
1882 dfs_find_final_overrider_post (tree binfo ATTRIBUTE_UNUSED
, void *data
)
1884 find_final_overrider_data
*ffod
= (find_final_overrider_data
*) data
;
1885 VEC_pop (tree
, ffod
->path
);
1890 /* Returns a TREE_LIST whose TREE_PURPOSE is the final overrider for
1891 FN and whose TREE_VALUE is the binfo for the base where the
1892 overriding occurs. BINFO (in the hierarchy dominated by the binfo
1893 DERIVED) is the base object in which FN is declared. */
1896 find_final_overrider (tree derived
, tree binfo
, tree fn
)
1898 find_final_overrider_data ffod
;
1900 /* Getting this right is a little tricky. This is valid:
1902 struct S { virtual void f (); };
1903 struct T { virtual void f (); };
1904 struct U : public S, public T { };
1906 even though calling `f' in `U' is ambiguous. But,
1908 struct R { virtual void f(); };
1909 struct S : virtual public R { virtual void f (); };
1910 struct T : virtual public R { virtual void f (); };
1911 struct U : public S, public T { };
1913 is not -- there's no way to decide whether to put `S::f' or
1914 `T::f' in the vtable for `R'.
1916 The solution is to look at all paths to BINFO. If we find
1917 different overriders along any two, then there is a problem. */
1918 if (DECL_THUNK_P (fn
))
1919 fn
= THUNK_TARGET (fn
);
1921 /* Determine the depth of the hierarchy. */
1923 ffod
.declaring_base
= binfo
;
1924 ffod
.candidates
= NULL_TREE
;
1925 ffod
.path
= VEC_alloc (tree
, 30);
1927 dfs_walk_all (derived
, dfs_find_final_overrider_pre
,
1928 dfs_find_final_overrider_post
, &ffod
);
1930 VEC_free (tree
, ffod
.path
);
1932 /* If there was no winner, issue an error message. */
1933 if (!ffod
.candidates
|| TREE_CHAIN (ffod
.candidates
))
1935 error ("no unique final overrider for %qD in %qT", fn
,
1936 BINFO_TYPE (derived
));
1937 return error_mark_node
;
1940 return ffod
.candidates
;
1943 /* Return the index of the vcall offset for FN when TYPE is used as a
1947 get_vcall_index (tree fn
, tree type
)
1949 VEC (tree_pair_s
) *indices
= CLASSTYPE_VCALL_INDICES (type
);
1953 for (ix
= 0; VEC_iterate (tree_pair_s
, indices
, ix
, p
); ix
++)
1954 if ((DECL_DESTRUCTOR_P (fn
) && DECL_DESTRUCTOR_P (p
->purpose
))
1955 || same_signature_p (fn
, p
->purpose
))
1958 /* There should always be an appropriate index. */
1962 /* Update an entry in the vtable for BINFO, which is in the hierarchy
1963 dominated by T. FN has been overridden in BINFO; VIRTUALS points to the
1964 corresponding position in the BINFO_VIRTUALS list. */
1967 update_vtable_entry_for_fn (tree t
, tree binfo
, tree fn
, tree
* virtuals
,
1975 tree overrider_fn
, overrider_target
;
1976 tree target_fn
= DECL_THUNK_P (fn
) ? THUNK_TARGET (fn
) : fn
;
1977 tree over_return
, base_return
;
1980 /* Find the nearest primary base (possibly binfo itself) which defines
1981 this function; this is the class the caller will convert to when
1982 calling FN through BINFO. */
1983 for (b
= binfo
; ; b
= get_primary_binfo (b
))
1986 if (look_for_overrides_here (BINFO_TYPE (b
), target_fn
))
1989 /* The nearest definition is from a lost primary. */
1990 if (BINFO_LOST_PRIMARY_P (b
))
1995 /* Find the final overrider. */
1996 overrider
= find_final_overrider (TYPE_BINFO (t
), b
, target_fn
);
1997 if (overrider
== error_mark_node
)
1999 overrider_target
= overrider_fn
= TREE_PURPOSE (overrider
);
2001 /* Check for adjusting covariant return types. */
2002 over_return
= TREE_TYPE (TREE_TYPE (overrider_target
));
2003 base_return
= TREE_TYPE (TREE_TYPE (target_fn
));
2005 if (POINTER_TYPE_P (over_return
)
2006 && TREE_CODE (over_return
) == TREE_CODE (base_return
)
2007 && CLASS_TYPE_P (TREE_TYPE (over_return
))
2008 && CLASS_TYPE_P (TREE_TYPE (base_return
)))
2010 /* If FN is a covariant thunk, we must figure out the adjustment
2011 to the final base FN was converting to. As OVERRIDER_TARGET might
2012 also be converting to the return type of FN, we have to
2013 combine the two conversions here. */
2014 tree fixed_offset
, virtual_offset
;
2016 over_return
= TREE_TYPE (over_return
);
2017 base_return
= TREE_TYPE (base_return
);
2019 if (DECL_THUNK_P (fn
))
2021 gcc_assert (DECL_RESULT_THUNK_P (fn
));
2022 fixed_offset
= ssize_int (THUNK_FIXED_OFFSET (fn
));
2023 virtual_offset
= THUNK_VIRTUAL_OFFSET (fn
);
2026 fixed_offset
= virtual_offset
= NULL_TREE
;
2029 /* Find the equivalent binfo within the return type of the
2030 overriding function. We will want the vbase offset from
2032 virtual_offset
= binfo_for_vbase (BINFO_TYPE (virtual_offset
),
2034 else if (!same_type_ignoring_top_level_qualifiers_p
2035 (over_return
, base_return
))
2037 /* There was no existing virtual thunk (which takes
2038 precedence). So find the binfo of the base function's
2039 return type within the overriding function's return type.
2040 We cannot call lookup base here, because we're inside a
2041 dfs_walk, and will therefore clobber the BINFO_MARKED
2042 flags. Fortunately we know the covariancy is valid (it
2043 has already been checked), so we can just iterate along
2044 the binfos, which have been chained in inheritance graph
2045 order. Of course it is lame that we have to repeat the
2046 search here anyway -- we should really be caching pieces
2047 of the vtable and avoiding this repeated work. */
2048 tree thunk_binfo
, base_binfo
;
2050 /* Find the base binfo within the overriding function's
2052 for (base_binfo
= TYPE_BINFO (base_return
),
2053 thunk_binfo
= TYPE_BINFO (over_return
);
2054 !SAME_BINFO_TYPE_P (BINFO_TYPE (thunk_binfo
),
2055 BINFO_TYPE (base_binfo
));
2056 thunk_binfo
= TREE_CHAIN (thunk_binfo
))
2059 /* See if virtual inheritance is involved. */
2060 for (virtual_offset
= thunk_binfo
;
2062 virtual_offset
= BINFO_INHERITANCE_CHAIN (virtual_offset
))
2063 if (BINFO_VIRTUAL_P (virtual_offset
))
2066 if (virtual_offset
|| !BINFO_OFFSET_ZEROP (thunk_binfo
))
2068 tree offset
= convert (ssizetype
, BINFO_OFFSET (thunk_binfo
));
2072 /* We convert via virtual base. Adjust the fixed
2073 offset to be from there. */
2074 offset
= size_diffop
2076 (ssizetype
, BINFO_OFFSET (virtual_offset
)));
2079 /* There was an existing fixed offset, this must be
2080 from the base just converted to, and the base the
2081 FN was thunking to. */
2082 fixed_offset
= size_binop (PLUS_EXPR
, fixed_offset
, offset
);
2084 fixed_offset
= offset
;
2088 if (fixed_offset
|| virtual_offset
)
2089 /* Replace the overriding function with a covariant thunk. We
2090 will emit the overriding function in its own slot as
2092 overrider_fn
= make_thunk (overrider_target
, /*this_adjusting=*/0,
2093 fixed_offset
, virtual_offset
);
2096 gcc_assert (!DECL_THUNK_P (fn
));
2098 /* Assume that we will produce a thunk that convert all the way to
2099 the final overrider, and not to an intermediate virtual base. */
2100 virtual_base
= NULL_TREE
;
2102 /* See if we can convert to an intermediate virtual base first, and then
2103 use the vcall offset located there to finish the conversion. */
2104 for (; b
; b
= BINFO_INHERITANCE_CHAIN (b
))
2106 /* If we find the final overrider, then we can stop
2108 if (SAME_BINFO_TYPE_P (BINFO_TYPE (b
),
2109 BINFO_TYPE (TREE_VALUE (overrider
))))
2112 /* If we find a virtual base, and we haven't yet found the
2113 overrider, then there is a virtual base between the
2114 declaring base (first_defn) and the final overrider. */
2115 if (BINFO_VIRTUAL_P (b
))
2122 if (overrider_fn
!= overrider_target
&& !virtual_base
)
2124 /* The ABI specifies that a covariant thunk includes a mangling
2125 for a this pointer adjustment. This-adjusting thunks that
2126 override a function from a virtual base have a vcall
2127 adjustment. When the virtual base in question is a primary
2128 virtual base, we know the adjustments are zero, (and in the
2129 non-covariant case, we would not use the thunk).
2130 Unfortunately we didn't notice this could happen, when
2131 designing the ABI and so never mandated that such a covariant
2132 thunk should be emitted. Because we must use the ABI mandated
2133 name, we must continue searching from the binfo where we
2134 found the most recent definition of the function, towards the
2135 primary binfo which first introduced the function into the
2136 vtable. If that enters a virtual base, we must use a vcall
2137 this-adjusting thunk. Bleah! */
2138 tree probe
= first_defn
;
2140 while ((probe
= get_primary_binfo (probe
))
2141 && (unsigned) list_length (BINFO_VIRTUALS (probe
)) > ix
)
2142 if (BINFO_VIRTUAL_P (probe
))
2143 virtual_base
= probe
;
2146 /* Even if we find a virtual base, the correct delta is
2147 between the overrider and the binfo we're building a vtable
2149 goto virtual_covariant
;
2152 /* Compute the constant adjustment to the `this' pointer. The
2153 `this' pointer, when this function is called, will point at BINFO
2154 (or one of its primary bases, which are at the same offset). */
2156 /* The `this' pointer needs to be adjusted from the declaration to
2157 the nearest virtual base. */
2158 delta
= size_diffop (convert (ssizetype
, BINFO_OFFSET (virtual_base
)),
2159 convert (ssizetype
, BINFO_OFFSET (first_defn
)));
2161 /* If the nearest definition is in a lost primary, we don't need an
2162 entry in our vtable. Except possibly in a constructor vtable,
2163 if we happen to get our primary back. In that case, the offset
2164 will be zero, as it will be a primary base. */
2165 delta
= size_zero_node
;
2167 /* The `this' pointer needs to be adjusted from pointing to
2168 BINFO to pointing at the base where the final overrider
2171 delta
= size_diffop (convert (ssizetype
,
2172 BINFO_OFFSET (TREE_VALUE (overrider
))),
2173 convert (ssizetype
, BINFO_OFFSET (binfo
)));
2175 modify_vtable_entry (t
, binfo
, overrider_fn
, delta
, virtuals
);
2178 BV_VCALL_INDEX (*virtuals
)
2179 = get_vcall_index (overrider_target
, BINFO_TYPE (virtual_base
));
2181 BV_VCALL_INDEX (*virtuals
) = NULL_TREE
;
2184 /* Called from modify_all_vtables via dfs_walk. */
2187 dfs_modify_vtables (tree binfo
, void* data
)
2189 tree t
= (tree
) data
;
2194 if (!TYPE_CONTAINS_VPTR_P (BINFO_TYPE (binfo
)))
2195 /* A base without a vtable needs no modification, and its bases
2196 are uninteresting. */
2197 return dfs_skip_bases
;
2199 if (SAME_BINFO_TYPE_P (BINFO_TYPE (binfo
), t
)
2200 && !CLASSTYPE_HAS_PRIMARY_BASE_P (t
))
2201 /* Don't do the primary vtable, if it's new. */
2204 if (BINFO_PRIMARY_P (binfo
) && !BINFO_VIRTUAL_P (binfo
))
2205 /* There's no need to modify the vtable for a non-virtual primary
2206 base; we're not going to use that vtable anyhow. We do still
2207 need to do this for virtual primary bases, as they could become
2208 non-primary in a construction vtable. */
2211 make_new_vtable (t
, binfo
);
2213 /* Now, go through each of the virtual functions in the virtual
2214 function table for BINFO. Find the final overrider, and update
2215 the BINFO_VIRTUALS list appropriately. */
2216 for (ix
= 0, virtuals
= BINFO_VIRTUALS (binfo
),
2217 old_virtuals
= BINFO_VIRTUALS (TYPE_BINFO (BINFO_TYPE (binfo
)));
2219 ix
++, virtuals
= TREE_CHAIN (virtuals
),
2220 old_virtuals
= TREE_CHAIN (old_virtuals
))
2221 update_vtable_entry_for_fn (t
,
2223 BV_FN (old_virtuals
),
2229 /* Update all of the primary and secondary vtables for T. Create new
2230 vtables as required, and initialize their RTTI information. Each
2231 of the functions in VIRTUALS is declared in T and may override a
2232 virtual function from a base class; find and modify the appropriate
2233 entries to point to the overriding functions. Returns a list, in
2234 declaration order, of the virtual functions that are declared in T,
2235 but do not appear in the primary base class vtable, and which
2236 should therefore be appended to the end of the vtable for T. */
2239 modify_all_vtables (tree t
, tree virtuals
)
2241 tree binfo
= TYPE_BINFO (t
);
2244 /* Update all of the vtables. */
2245 dfs_walk_once (binfo
, dfs_modify_vtables
, NULL
, t
);
2247 /* Add virtual functions not already in our primary vtable. These
2248 will be both those introduced by this class, and those overridden
2249 from secondary bases. It does not include virtuals merely
2250 inherited from secondary bases. */
2251 for (fnsp
= &virtuals
; *fnsp
; )
2253 tree fn
= TREE_VALUE (*fnsp
);
2255 if (!value_member (fn
, BINFO_VIRTUALS (binfo
))
2256 || DECL_VINDEX (fn
) == error_mark_node
)
2258 /* We don't need to adjust the `this' pointer when
2259 calling this function. */
2260 BV_DELTA (*fnsp
) = integer_zero_node
;
2261 BV_VCALL_INDEX (*fnsp
) = NULL_TREE
;
2263 /* This is a function not already in our vtable. Keep it. */
2264 fnsp
= &TREE_CHAIN (*fnsp
);
2267 /* We've already got an entry for this function. Skip it. */
2268 *fnsp
= TREE_CHAIN (*fnsp
);
2274 /* Get the base virtual function declarations in T that have the
2278 get_basefndecls (tree name
, tree t
)
2281 tree base_fndecls
= NULL_TREE
;
2282 int n_baseclasses
= BINFO_N_BASE_BINFOS (TYPE_BINFO (t
));
2285 /* Find virtual functions in T with the indicated NAME. */
2286 i
= lookup_fnfields_1 (t
, name
);
2288 for (methods
= VEC_index (tree
, CLASSTYPE_METHOD_VEC (t
), i
);
2290 methods
= OVL_NEXT (methods
))
2292 tree method
= OVL_CURRENT (methods
);
2294 if (TREE_CODE (method
) == FUNCTION_DECL
2295 && DECL_VINDEX (method
))
2296 base_fndecls
= tree_cons (NULL_TREE
, method
, base_fndecls
);
2300 return base_fndecls
;
2302 for (i
= 0; i
< n_baseclasses
; i
++)
2304 tree basetype
= BINFO_TYPE (BINFO_BASE_BINFO (TYPE_BINFO (t
), i
));
2305 base_fndecls
= chainon (get_basefndecls (name
, basetype
),
2309 return base_fndecls
;
2312 /* If this declaration supersedes the declaration of
2313 a method declared virtual in the base class, then
2314 mark this field as being virtual as well. */
2317 check_for_override (tree decl
, tree ctype
)
2319 if (TREE_CODE (decl
) == TEMPLATE_DECL
)
2320 /* In [temp.mem] we have:
2322 A specialization of a member function template does not
2323 override a virtual function from a base class. */
2325 if ((DECL_DESTRUCTOR_P (decl
)
2326 || IDENTIFIER_VIRTUAL_P (DECL_NAME (decl
))
2327 || DECL_CONV_FN_P (decl
))
2328 && look_for_overrides (ctype
, decl
)
2329 && !DECL_STATIC_FUNCTION_P (decl
))
2330 /* Set DECL_VINDEX to a value that is neither an INTEGER_CST nor
2331 the error_mark_node so that we know it is an overriding
2333 DECL_VINDEX (decl
) = decl
;
2335 if (DECL_VIRTUAL_P (decl
))
2337 if (!DECL_VINDEX (decl
))
2338 DECL_VINDEX (decl
) = error_mark_node
;
2339 IDENTIFIER_VIRTUAL_P (DECL_NAME (decl
)) = 1;
2343 /* Warn about hidden virtual functions that are not overridden in t.
2344 We know that constructors and destructors don't apply. */
2347 warn_hidden (tree t
)
2349 VEC(tree
) *method_vec
= CLASSTYPE_METHOD_VEC (t
);
2353 /* We go through each separately named virtual function. */
2354 for (i
= CLASSTYPE_FIRST_CONVERSION_SLOT
;
2355 VEC_iterate (tree
, method_vec
, i
, fns
);
2366 /* All functions in this slot in the CLASSTYPE_METHOD_VEC will
2367 have the same name. Figure out what name that is. */
2368 name
= DECL_NAME (OVL_CURRENT (fns
));
2369 /* There are no possibly hidden functions yet. */
2370 base_fndecls
= NULL_TREE
;
2371 /* Iterate through all of the base classes looking for possibly
2372 hidden functions. */
2373 for (binfo
= TYPE_BINFO (t
), j
= 0;
2374 BINFO_BASE_ITERATE (binfo
, j
, base_binfo
); j
++)
2376 tree basetype
= BINFO_TYPE (base_binfo
);
2377 base_fndecls
= chainon (get_basefndecls (name
, basetype
),
2381 /* If there are no functions to hide, continue. */
2385 /* Remove any overridden functions. */
2386 for (fn
= fns
; fn
; fn
= OVL_NEXT (fn
))
2388 fndecl
= OVL_CURRENT (fn
);
2389 if (DECL_VINDEX (fndecl
))
2391 tree
*prev
= &base_fndecls
;
2394 /* If the method from the base class has the same
2395 signature as the method from the derived class, it
2396 has been overridden. */
2397 if (same_signature_p (fndecl
, TREE_VALUE (*prev
)))
2398 *prev
= TREE_CHAIN (*prev
);
2400 prev
= &TREE_CHAIN (*prev
);
2404 /* Now give a warning for all base functions without overriders,
2405 as they are hidden. */
2406 while (base_fndecls
)
2408 /* Here we know it is a hider, and no overrider exists. */
2409 cp_warning_at ("%qD was hidden", TREE_VALUE (base_fndecls
));
2410 cp_warning_at (" by %qD", fns
);
2411 base_fndecls
= TREE_CHAIN (base_fndecls
);
2416 /* Check for things that are invalid. There are probably plenty of other
2417 things we should check for also. */
2420 finish_struct_anon (tree t
)
2424 for (field
= TYPE_FIELDS (t
); field
; field
= TREE_CHAIN (field
))
2426 if (TREE_STATIC (field
))
2428 if (TREE_CODE (field
) != FIELD_DECL
)
2431 if (DECL_NAME (field
) == NULL_TREE
2432 && ANON_AGGR_TYPE_P (TREE_TYPE (field
)))
2434 tree elt
= TYPE_FIELDS (TREE_TYPE (field
));
2435 for (; elt
; elt
= TREE_CHAIN (elt
))
2437 /* We're generally only interested in entities the user
2438 declared, but we also find nested classes by noticing
2439 the TYPE_DECL that we create implicitly. You're
2440 allowed to put one anonymous union inside another,
2441 though, so we explicitly tolerate that. We use
2442 TYPE_ANONYMOUS_P rather than ANON_AGGR_TYPE_P so that
2443 we also allow unnamed types used for defining fields. */
2444 if (DECL_ARTIFICIAL (elt
)
2445 && (!DECL_IMPLICIT_TYPEDEF_P (elt
)
2446 || TYPE_ANONYMOUS_P (TREE_TYPE (elt
))))
2449 if (TREE_CODE (elt
) != FIELD_DECL
)
2451 cp_pedwarn_at ("%q#D invalid; an anonymous union can "
2452 "only have non-static data members",
2457 if (TREE_PRIVATE (elt
))
2458 cp_pedwarn_at ("private member %q#D in anonymous union",
2460 else if (TREE_PROTECTED (elt
))
2461 cp_pedwarn_at ("protected member %q#D in anonymous union",
2464 TREE_PRIVATE (elt
) = TREE_PRIVATE (field
);
2465 TREE_PROTECTED (elt
) = TREE_PROTECTED (field
);
2471 /* Add T to CLASSTYPE_DECL_LIST of current_class_type which
2472 will be used later during class template instantiation.
2473 When FRIEND_P is zero, T can be a static member data (VAR_DECL),
2474 a non-static member data (FIELD_DECL), a member function
2475 (FUNCTION_DECL), a nested type (RECORD_TYPE, ENUM_TYPE),
2476 a typedef (TYPE_DECL) or a member class template (TEMPLATE_DECL)
2477 When FRIEND_P is nonzero, T is either a friend class
2478 (RECORD_TYPE, TEMPLATE_DECL) or a friend function
2479 (FUNCTION_DECL, TEMPLATE_DECL). */
2482 maybe_add_class_template_decl_list (tree type
, tree t
, int friend_p
)
2484 /* Save some memory by not creating TREE_LIST if TYPE is not template. */
2485 if (CLASSTYPE_TEMPLATE_INFO (type
))
2486 CLASSTYPE_DECL_LIST (type
)
2487 = tree_cons (friend_p
? NULL_TREE
: type
,
2488 t
, CLASSTYPE_DECL_LIST (type
));
2491 /* Create default constructors, assignment operators, and so forth for
2492 the type indicated by T, if they are needed. CANT_HAVE_CONST_CTOR,
2493 and CANT_HAVE_CONST_ASSIGNMENT are nonzero if, for whatever reason,
2494 the class cannot have a default constructor, copy constructor
2495 taking a const reference argument, or an assignment operator taking
2496 a const reference, respectively. */
2499 add_implicitly_declared_members (tree t
,
2500 int cant_have_const_cctor
,
2501 int cant_have_const_assignment
)
2504 if (!CLASSTYPE_DESTRUCTORS (t
))
2506 /* In general, we create destructors lazily. */
2507 CLASSTYPE_LAZY_DESTRUCTOR (t
) = 1;
2508 /* However, if the implicit destructor is non-trivial
2509 destructor, we sometimes have to create it at this point. */
2510 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (t
))
2514 if (TYPE_FOR_JAVA (t
))
2515 /* If this a Java class, any non-trivial destructor is
2516 invalid, even if compiler-generated. Therefore, if the
2517 destructor is non-trivial we create it now. */
2525 /* If the implicit destructor will be virtual, then we must
2526 generate it now because (unfortunately) we do not
2527 generate virtual tables lazily. */
2528 binfo
= TYPE_BINFO (t
);
2529 for (ix
= 0; BINFO_BASE_ITERATE (binfo
, ix
, base_binfo
); ix
++)
2534 base_type
= BINFO_TYPE (base_binfo
);
2535 dtor
= CLASSTYPE_DESTRUCTORS (base_type
);
2536 if (dtor
&& DECL_VIRTUAL_P (dtor
))
2544 /* If we can't get away with being lazy, generate the destructor
2547 lazily_declare_fn (sfk_destructor
, t
);
2551 /* Default constructor. */
2552 if (! TYPE_HAS_CONSTRUCTOR (t
))
2554 TYPE_HAS_DEFAULT_CONSTRUCTOR (t
) = 1;
2555 CLASSTYPE_LAZY_DEFAULT_CTOR (t
) = 1;
2558 /* Copy constructor. */
2559 if (! TYPE_HAS_INIT_REF (t
) && ! TYPE_FOR_JAVA (t
))
2561 TYPE_HAS_INIT_REF (t
) = 1;
2562 TYPE_HAS_CONST_INIT_REF (t
) = !cant_have_const_cctor
;
2563 CLASSTYPE_LAZY_COPY_CTOR (t
) = 1;
2564 TYPE_HAS_CONSTRUCTOR (t
) = 1;
2567 /* If there is no assignment operator, one will be created if and
2568 when it is needed. For now, just record whether or not the type
2569 of the parameter to the assignment operator will be a const or
2570 non-const reference. */
2571 if (!TYPE_HAS_ASSIGN_REF (t
) && !TYPE_FOR_JAVA (t
))
2573 TYPE_HAS_ASSIGN_REF (t
) = 1;
2574 TYPE_HAS_CONST_ASSIGN_REF (t
) = !cant_have_const_assignment
;
2575 CLASSTYPE_LAZY_ASSIGNMENT_OP (t
) = 1;
2579 /* Subroutine of finish_struct_1. Recursively count the number of fields
2580 in TYPE, including anonymous union members. */
2583 count_fields (tree fields
)
2587 for (x
= fields
; x
; x
= TREE_CHAIN (x
))
2589 if (TREE_CODE (x
) == FIELD_DECL
&& ANON_AGGR_TYPE_P (TREE_TYPE (x
)))
2590 n_fields
+= count_fields (TYPE_FIELDS (TREE_TYPE (x
)));
2597 /* Subroutine of finish_struct_1. Recursively add all the fields in the
2598 TREE_LIST FIELDS to the SORTED_FIELDS_TYPE elts, starting at offset IDX. */
2601 add_fields_to_record_type (tree fields
, struct sorted_fields_type
*field_vec
, int idx
)
2604 for (x
= fields
; x
; x
= TREE_CHAIN (x
))
2606 if (TREE_CODE (x
) == FIELD_DECL
&& ANON_AGGR_TYPE_P (TREE_TYPE (x
)))
2607 idx
= add_fields_to_record_type (TYPE_FIELDS (TREE_TYPE (x
)), field_vec
, idx
);
2609 field_vec
->elts
[idx
++] = x
;
2614 /* FIELD is a bit-field. We are finishing the processing for its
2615 enclosing type. Issue any appropriate messages and set appropriate
2619 check_bitfield_decl (tree field
)
2621 tree type
= TREE_TYPE (field
);
2624 /* Detect invalid bit-field type. */
2625 if (DECL_INITIAL (field
)
2626 && ! INTEGRAL_TYPE_P (TREE_TYPE (field
)))
2628 cp_error_at ("bit-field %q#D with non-integral type", field
);
2629 w
= error_mark_node
;
2632 /* Detect and ignore out of range field width. */
2633 if (DECL_INITIAL (field
))
2635 w
= DECL_INITIAL (field
);
2637 /* Avoid the non_lvalue wrapper added by fold for PLUS_EXPRs. */
2640 /* detect invalid field size. */
2641 w
= integral_constant_value (w
);
2643 if (TREE_CODE (w
) != INTEGER_CST
)
2645 cp_error_at ("bit-field %qD width not an integer constant",
2647 w
= error_mark_node
;
2649 else if (tree_int_cst_sgn (w
) < 0)
2651 cp_error_at ("negative width in bit-field %qD", field
);
2652 w
= error_mark_node
;
2654 else if (integer_zerop (w
) && DECL_NAME (field
) != 0)
2656 cp_error_at ("zero width for bit-field %qD", field
);
2657 w
= error_mark_node
;
2659 else if (compare_tree_int (w
, TYPE_PRECISION (type
)) > 0
2660 && TREE_CODE (type
) != ENUMERAL_TYPE
2661 && TREE_CODE (type
) != BOOLEAN_TYPE
)
2662 cp_warning_at ("width of %qD exceeds its type", field
);
2663 else if (TREE_CODE (type
) == ENUMERAL_TYPE
2664 && (0 > compare_tree_int (w
,
2665 min_precision (TYPE_MIN_VALUE (type
),
2666 TYPE_UNSIGNED (type
)))
2667 || 0 > compare_tree_int (w
,
2669 (TYPE_MAX_VALUE (type
),
2670 TYPE_UNSIGNED (type
)))))
2671 cp_warning_at ("%qD is too small to hold all values of %q#T",
2675 /* Remove the bit-field width indicator so that the rest of the
2676 compiler does not treat that value as an initializer. */
2677 DECL_INITIAL (field
) = NULL_TREE
;
2679 if (w
!= error_mark_node
)
2681 DECL_SIZE (field
) = convert (bitsizetype
, w
);
2682 DECL_BIT_FIELD (field
) = 1;
2686 /* Non-bit-fields are aligned for their type. */
2687 DECL_BIT_FIELD (field
) = 0;
2688 CLEAR_DECL_C_BIT_FIELD (field
);
2692 /* FIELD is a non bit-field. We are finishing the processing for its
2693 enclosing type T. Issue any appropriate messages and set appropriate
2697 check_field_decl (tree field
,
2699 int* cant_have_const_ctor
,
2700 int* no_const_asn_ref
,
2701 int* any_default_members
)
2703 tree type
= strip_array_types (TREE_TYPE (field
));
2705 /* An anonymous union cannot contain any fields which would change
2706 the settings of CANT_HAVE_CONST_CTOR and friends. */
2707 if (ANON_UNION_TYPE_P (type
))
2709 /* And, we don't set TYPE_HAS_CONST_INIT_REF, etc., for anonymous
2710 structs. So, we recurse through their fields here. */
2711 else if (ANON_AGGR_TYPE_P (type
))
2715 for (fields
= TYPE_FIELDS (type
); fields
; fields
= TREE_CHAIN (fields
))
2716 if (TREE_CODE (fields
) == FIELD_DECL
&& !DECL_C_BIT_FIELD (field
))
2717 check_field_decl (fields
, t
, cant_have_const_ctor
,
2718 no_const_asn_ref
, any_default_members
);
2720 /* Check members with class type for constructors, destructors,
2722 else if (CLASS_TYPE_P (type
))
2724 /* Never let anything with uninheritable virtuals
2725 make it through without complaint. */
2726 abstract_virtuals_error (field
, type
);
2728 if (TREE_CODE (t
) == UNION_TYPE
)
2730 if (TYPE_NEEDS_CONSTRUCTING (type
))
2731 cp_error_at ("member %q#D with constructor not allowed in union",
2733 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type
))
2734 cp_error_at ("member %q#D with destructor not allowed in union",
2736 if (TYPE_HAS_COMPLEX_ASSIGN_REF (type
))
2737 cp_error_at ("member %q#D with copy assignment operator not allowed in union",
2742 TYPE_NEEDS_CONSTRUCTING (t
) |= TYPE_NEEDS_CONSTRUCTING (type
);
2743 TYPE_HAS_NONTRIVIAL_DESTRUCTOR (t
)
2744 |= TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type
);
2745 TYPE_HAS_COMPLEX_ASSIGN_REF (t
) |= TYPE_HAS_COMPLEX_ASSIGN_REF (type
);
2746 TYPE_HAS_COMPLEX_INIT_REF (t
) |= TYPE_HAS_COMPLEX_INIT_REF (type
);
2749 if (!TYPE_HAS_CONST_INIT_REF (type
))
2750 *cant_have_const_ctor
= 1;
2752 if (!TYPE_HAS_CONST_ASSIGN_REF (type
))
2753 *no_const_asn_ref
= 1;
2755 if (DECL_INITIAL (field
) != NULL_TREE
)
2757 /* `build_class_init_list' does not recognize
2759 if (TREE_CODE (t
) == UNION_TYPE
&& any_default_members
!= 0)
2760 error ("multiple fields in union %qT initialized", t
);
2761 *any_default_members
= 1;
2765 /* Check the data members (both static and non-static), class-scoped
2766 typedefs, etc., appearing in the declaration of T. Issue
2767 appropriate diagnostics. Sets ACCESS_DECLS to a list (in
2768 declaration order) of access declarations; each TREE_VALUE in this
2769 list is a USING_DECL.
2771 In addition, set the following flags:
2774 The class is empty, i.e., contains no non-static data members.
2776 CANT_HAVE_CONST_CTOR_P
2777 This class cannot have an implicitly generated copy constructor
2778 taking a const reference.
2780 CANT_HAVE_CONST_ASN_REF
2781 This class cannot have an implicitly generated assignment
2782 operator taking a const reference.
2784 All of these flags should be initialized before calling this
2787 Returns a pointer to the end of the TYPE_FIELDs chain; additional
2788 fields can be added by adding to this chain. */
2791 check_field_decls (tree t
, tree
*access_decls
,
2792 int *cant_have_const_ctor_p
,
2793 int *no_const_asn_ref_p
)
2798 int any_default_members
;
2800 /* Assume there are no access declarations. */
2801 *access_decls
= NULL_TREE
;
2802 /* Assume this class has no pointer members. */
2803 has_pointers
= false;
2804 /* Assume none of the members of this class have default
2806 any_default_members
= 0;
2808 for (field
= &TYPE_FIELDS (t
); *field
; field
= next
)
2811 tree type
= TREE_TYPE (x
);
2813 next
= &TREE_CHAIN (x
);
2815 if (TREE_CODE (x
) == FIELD_DECL
)
2817 if (TYPE_PACKED (t
))
2819 if (!pod_type_p (TREE_TYPE (x
)) && !TYPE_PACKED (TREE_TYPE (x
)))
2821 ("ignoring packed attribute on unpacked non-POD field %q#D",
2824 DECL_PACKED (x
) = 1;
2827 if (DECL_C_BIT_FIELD (x
) && integer_zerop (DECL_INITIAL (x
)))
2828 /* We don't treat zero-width bitfields as making a class
2835 /* The class is non-empty. */
2836 CLASSTYPE_EMPTY_P (t
) = 0;
2837 /* The class is not even nearly empty. */
2838 CLASSTYPE_NEARLY_EMPTY_P (t
) = 0;
2839 /* If one of the data members contains an empty class,
2841 element_type
= strip_array_types (type
);
2842 if (CLASS_TYPE_P (element_type
)
2843 && CLASSTYPE_CONTAINS_EMPTY_CLASS_P (element_type
))
2844 CLASSTYPE_CONTAINS_EMPTY_CLASS_P (t
) = 1;
2848 if (TREE_CODE (x
) == USING_DECL
)
2850 /* Prune the access declaration from the list of fields. */
2851 *field
= TREE_CHAIN (x
);
2853 /* Save the access declarations for our caller. */
2854 *access_decls
= tree_cons (NULL_TREE
, x
, *access_decls
);
2856 /* Since we've reset *FIELD there's no reason to skip to the
2862 if (TREE_CODE (x
) == TYPE_DECL
2863 || TREE_CODE (x
) == TEMPLATE_DECL
)
2866 /* If we've gotten this far, it's a data member, possibly static,
2867 or an enumerator. */
2868 DECL_CONTEXT (x
) = t
;
2870 /* When this goes into scope, it will be a non-local reference. */
2871 DECL_NONLOCAL (x
) = 1;
2873 if (TREE_CODE (t
) == UNION_TYPE
)
2877 If a union contains a static data member, or a member of
2878 reference type, the program is ill-formed. */
2879 if (TREE_CODE (x
) == VAR_DECL
)
2881 cp_error_at ("%qD may not be static because it is a member of a union", x
);
2884 if (TREE_CODE (type
) == REFERENCE_TYPE
)
2886 cp_error_at ("%qD may not have reference type %qT because"
2887 " it is a member of a union",
2893 /* ``A local class cannot have static data members.'' ARM 9.4 */
2894 if (current_function_decl
&& TREE_STATIC (x
))
2895 cp_error_at ("field %qD in local class cannot be static", x
);
2897 /* Perform error checking that did not get done in
2899 if (TREE_CODE (type
) == FUNCTION_TYPE
)
2901 cp_error_at ("field %qD invalidly declared function type", x
);
2902 type
= build_pointer_type (type
);
2903 TREE_TYPE (x
) = type
;
2905 else if (TREE_CODE (type
) == METHOD_TYPE
)
2907 cp_error_at ("field %qD invalidly declared method type", x
);
2908 type
= build_pointer_type (type
);
2909 TREE_TYPE (x
) = type
;
2912 if (type
== error_mark_node
)
2915 if (TREE_CODE (x
) == CONST_DECL
|| TREE_CODE (x
) == VAR_DECL
)
2918 /* Now it can only be a FIELD_DECL. */
2920 if (TREE_PRIVATE (x
) || TREE_PROTECTED (x
))
2921 CLASSTYPE_NON_AGGREGATE (t
) = 1;
2923 /* If this is of reference type, check if it needs an init.
2924 Also do a little ANSI jig if necessary. */
2925 if (TREE_CODE (type
) == REFERENCE_TYPE
)
2927 CLASSTYPE_NON_POD_P (t
) = 1;
2928 if (DECL_INITIAL (x
) == NULL_TREE
)
2929 SET_CLASSTYPE_REF_FIELDS_NEED_INIT (t
, 1);
2931 /* ARM $12.6.2: [A member initializer list] (or, for an
2932 aggregate, initialization by a brace-enclosed list) is the
2933 only way to initialize nonstatic const and reference
2935 TYPE_HAS_COMPLEX_ASSIGN_REF (t
) = 1;
2937 if (! TYPE_HAS_CONSTRUCTOR (t
) && CLASSTYPE_NON_AGGREGATE (t
)
2939 cp_warning_at ("non-static reference %q#D in class without a constructor", x
);
2942 type
= strip_array_types (type
);
2944 /* This is used by -Weffc++ (see below). Warn only for pointers
2945 to members which might hold dynamic memory. So do not warn
2946 for pointers to functions or pointers to members. */
2947 if (TYPE_PTR_P (type
)
2948 && !TYPE_PTRFN_P (type
)
2949 && !TYPE_PTR_TO_MEMBER_P (type
))
2950 has_pointers
= true;
2952 if (CLASS_TYPE_P (type
))
2954 if (CLASSTYPE_REF_FIELDS_NEED_INIT (type
))
2955 SET_CLASSTYPE_REF_FIELDS_NEED_INIT (t
, 1);
2956 if (CLASSTYPE_READONLY_FIELDS_NEED_INIT (type
))
2957 SET_CLASSTYPE_READONLY_FIELDS_NEED_INIT (t
, 1);
2960 if (DECL_MUTABLE_P (x
) || TYPE_HAS_MUTABLE_P (type
))
2961 CLASSTYPE_HAS_MUTABLE (t
) = 1;
2963 if (! pod_type_p (type
))
2964 /* DR 148 now allows pointers to members (which are POD themselves),
2965 to be allowed in POD structs. */
2966 CLASSTYPE_NON_POD_P (t
) = 1;
2968 if (! zero_init_p (type
))
2969 CLASSTYPE_NON_ZERO_INIT_P (t
) = 1;
2971 /* If any field is const, the structure type is pseudo-const. */
2972 if (CP_TYPE_CONST_P (type
))
2974 C_TYPE_FIELDS_READONLY (t
) = 1;
2975 if (DECL_INITIAL (x
) == NULL_TREE
)
2976 SET_CLASSTYPE_READONLY_FIELDS_NEED_INIT (t
, 1);
2978 /* ARM $12.6.2: [A member initializer list] (or, for an
2979 aggregate, initialization by a brace-enclosed list) is the
2980 only way to initialize nonstatic const and reference
2982 TYPE_HAS_COMPLEX_ASSIGN_REF (t
) = 1;
2984 if (! TYPE_HAS_CONSTRUCTOR (t
) && CLASSTYPE_NON_AGGREGATE (t
)
2986 cp_warning_at ("non-static const member %q#D in class without a constructor", x
);
2988 /* A field that is pseudo-const makes the structure likewise. */
2989 else if (CLASS_TYPE_P (type
))
2991 C_TYPE_FIELDS_READONLY (t
) |= C_TYPE_FIELDS_READONLY (type
);
2992 SET_CLASSTYPE_READONLY_FIELDS_NEED_INIT (t
,
2993 CLASSTYPE_READONLY_FIELDS_NEED_INIT (t
)
2994 | CLASSTYPE_READONLY_FIELDS_NEED_INIT (type
));
2997 /* Core issue 80: A nonstatic data member is required to have a
2998 different name from the class iff the class has a
2999 user-defined constructor. */
3000 if (constructor_name_p (DECL_NAME (x
), t
) && TYPE_HAS_CONSTRUCTOR (t
))
3001 cp_pedwarn_at ("field %q#D with same name as class", x
);
3003 /* We set DECL_C_BIT_FIELD in grokbitfield.
3004 If the type and width are valid, we'll also set DECL_BIT_FIELD. */
3005 if (DECL_C_BIT_FIELD (x
))
3006 check_bitfield_decl (x
);
3008 check_field_decl (x
, t
,
3009 cant_have_const_ctor_p
,
3011 &any_default_members
);
3014 /* Effective C++ rule 11: if a class has dynamic memory held by pointers,
3015 it should also define a copy constructor and an assignment operator to
3016 implement the correct copy semantic (deep vs shallow, etc.). As it is
3017 not feasible to check whether the constructors do allocate dynamic memory
3018 and store it within members, we approximate the warning like this:
3020 -- Warn only if there are members which are pointers
3021 -- Warn only if there is a non-trivial constructor (otherwise,
3022 there cannot be memory allocated).
3023 -- Warn only if there is a non-trivial destructor. We assume that the
3024 user at least implemented the cleanup correctly, and a destructor
3025 is needed to free dynamic memory.
3027 This seems enough for practical purposes. */
3030 && TYPE_HAS_CONSTRUCTOR (t
)
3031 && TYPE_HAS_NONTRIVIAL_DESTRUCTOR (t
)
3032 && !(TYPE_HAS_INIT_REF (t
) && TYPE_HAS_ASSIGN_REF (t
)))
3034 warning ("%q#T has pointer data members", t
);
3036 if (! TYPE_HAS_INIT_REF (t
))
3038 warning (" but does not override %<%T(const %T&)%>", t
, t
);
3039 if (! TYPE_HAS_ASSIGN_REF (t
))
3040 warning (" or %<operator=(const %T&)%>", t
);
3042 else if (! TYPE_HAS_ASSIGN_REF (t
))
3043 warning (" but does not override %<operator=(const %T&)%>", t
);
3047 /* Check anonymous struct/anonymous union fields. */
3048 finish_struct_anon (t
);
3050 /* We've built up the list of access declarations in reverse order.
3052 *access_decls
= nreverse (*access_decls
);
3055 /* If TYPE is an empty class type, records its OFFSET in the table of
3059 record_subobject_offset (tree type
, tree offset
, splay_tree offsets
)
3063 if (!is_empty_class (type
))
3066 /* Record the location of this empty object in OFFSETS. */
3067 n
= splay_tree_lookup (offsets
, (splay_tree_key
) offset
);
3069 n
= splay_tree_insert (offsets
,
3070 (splay_tree_key
) offset
,
3071 (splay_tree_value
) NULL_TREE
);
3072 n
->value
= ((splay_tree_value
)
3073 tree_cons (NULL_TREE
,
3080 /* Returns nonzero if TYPE is an empty class type and there is
3081 already an entry in OFFSETS for the same TYPE as the same OFFSET. */
3084 check_subobject_offset (tree type
, tree offset
, splay_tree offsets
)
3089 if (!is_empty_class (type
))
3092 /* Record the location of this empty object in OFFSETS. */
3093 n
= splay_tree_lookup (offsets
, (splay_tree_key
) offset
);
3097 for (t
= (tree
) n
->value
; t
; t
= TREE_CHAIN (t
))
3098 if (same_type_p (TREE_VALUE (t
), type
))
3104 /* Walk through all the subobjects of TYPE (located at OFFSET). Call
3105 F for every subobject, passing it the type, offset, and table of
3106 OFFSETS. If VBASES_P is one, then virtual non-primary bases should
3109 If MAX_OFFSET is non-NULL, then subobjects with an offset greater
3110 than MAX_OFFSET will not be walked.
3112 If F returns a nonzero value, the traversal ceases, and that value
3113 is returned. Otherwise, returns zero. */
3116 walk_subobject_offsets (tree type
,
3117 subobject_offset_fn f
,
3124 tree type_binfo
= NULL_TREE
;
3126 /* If this OFFSET is bigger than the MAX_OFFSET, then we should
3128 if (max_offset
&& INT_CST_LT (max_offset
, offset
))
3133 if (abi_version_at_least (2))
3135 type
= BINFO_TYPE (type
);
3138 if (CLASS_TYPE_P (type
))
3144 /* Avoid recursing into objects that are not interesting. */
3145 if (!CLASSTYPE_CONTAINS_EMPTY_CLASS_P (type
))
3148 /* Record the location of TYPE. */
3149 r
= (*f
) (type
, offset
, offsets
);
3153 /* Iterate through the direct base classes of TYPE. */
3155 type_binfo
= TYPE_BINFO (type
);
3156 for (i
= 0; BINFO_BASE_ITERATE (type_binfo
, i
, binfo
); i
++)
3160 if (abi_version_at_least (2)
3161 && BINFO_VIRTUAL_P (binfo
))
3165 && BINFO_VIRTUAL_P (binfo
)
3166 && !BINFO_PRIMARY_P (binfo
))
3169 if (!abi_version_at_least (2))
3170 binfo_offset
= size_binop (PLUS_EXPR
,
3172 BINFO_OFFSET (binfo
));
3176 /* We cannot rely on BINFO_OFFSET being set for the base
3177 class yet, but the offsets for direct non-virtual
3178 bases can be calculated by going back to the TYPE. */
3179 orig_binfo
= BINFO_BASE_BINFO (TYPE_BINFO (type
), i
);
3180 binfo_offset
= size_binop (PLUS_EXPR
,
3182 BINFO_OFFSET (orig_binfo
));
3185 r
= walk_subobject_offsets (binfo
,
3190 (abi_version_at_least (2)
3191 ? /*vbases_p=*/0 : vbases_p
));
3196 if (abi_version_at_least (2) && CLASSTYPE_VBASECLASSES (type
))
3201 /* Iterate through the virtual base classes of TYPE. In G++
3202 3.2, we included virtual bases in the direct base class
3203 loop above, which results in incorrect results; the
3204 correct offsets for virtual bases are only known when
3205 working with the most derived type. */
3207 for (vbases
= CLASSTYPE_VBASECLASSES (type
), ix
= 0;
3208 VEC_iterate (tree
, vbases
, ix
, binfo
); ix
++)
3210 r
= walk_subobject_offsets (binfo
,
3212 size_binop (PLUS_EXPR
,
3214 BINFO_OFFSET (binfo
)),
3223 /* We still have to walk the primary base, if it is
3224 virtual. (If it is non-virtual, then it was walked
3226 tree vbase
= get_primary_binfo (type_binfo
);
3228 if (vbase
&& BINFO_VIRTUAL_P (vbase
)
3229 && BINFO_PRIMARY_P (vbase
)
3230 && BINFO_INHERITANCE_CHAIN (vbase
) == type_binfo
)
3232 r
= (walk_subobject_offsets
3234 offsets
, max_offset
, /*vbases_p=*/0));
3241 /* Iterate through the fields of TYPE. */
3242 for (field
= TYPE_FIELDS (type
); field
; field
= TREE_CHAIN (field
))
3243 if (TREE_CODE (field
) == FIELD_DECL
&& !DECL_ARTIFICIAL (field
))
3247 if (abi_version_at_least (2))
3248 field_offset
= byte_position (field
);
3250 /* In G++ 3.2, DECL_FIELD_OFFSET was used. */
3251 field_offset
= DECL_FIELD_OFFSET (field
);
3253 r
= walk_subobject_offsets (TREE_TYPE (field
),
3255 size_binop (PLUS_EXPR
,
3265 else if (TREE_CODE (type
) == ARRAY_TYPE
)
3267 tree element_type
= strip_array_types (type
);
3268 tree domain
= TYPE_DOMAIN (type
);
3271 /* Avoid recursing into objects that are not interesting. */
3272 if (!CLASS_TYPE_P (element_type
)
3273 || !CLASSTYPE_CONTAINS_EMPTY_CLASS_P (element_type
))
3276 /* Step through each of the elements in the array. */
3277 for (index
= size_zero_node
;
3278 /* G++ 3.2 had an off-by-one error here. */
3279 (abi_version_at_least (2)
3280 ? !INT_CST_LT (TYPE_MAX_VALUE (domain
), index
)
3281 : INT_CST_LT (index
, TYPE_MAX_VALUE (domain
)));
3282 index
= size_binop (PLUS_EXPR
, index
, size_one_node
))
3284 r
= walk_subobject_offsets (TREE_TYPE (type
),
3292 offset
= size_binop (PLUS_EXPR
, offset
,
3293 TYPE_SIZE_UNIT (TREE_TYPE (type
)));
3294 /* If this new OFFSET is bigger than the MAX_OFFSET, then
3295 there's no point in iterating through the remaining
3296 elements of the array. */
3297 if (max_offset
&& INT_CST_LT (max_offset
, offset
))
3305 /* Record all of the empty subobjects of TYPE (located at OFFSET) in
3306 OFFSETS. If VBASES_P is nonzero, virtual bases of TYPE are
3310 record_subobject_offsets (tree type
,
3315 walk_subobject_offsets (type
, record_subobject_offset
, offset
,
3316 offsets
, /*max_offset=*/NULL_TREE
, vbases_p
);
3319 /* Returns nonzero if any of the empty subobjects of TYPE (located at
3320 OFFSET) conflict with entries in OFFSETS. If VBASES_P is nonzero,
3321 virtual bases of TYPE are examined. */
3324 layout_conflict_p (tree type
,
3329 splay_tree_node max_node
;
3331 /* Get the node in OFFSETS that indicates the maximum offset where
3332 an empty subobject is located. */
3333 max_node
= splay_tree_max (offsets
);
3334 /* If there aren't any empty subobjects, then there's no point in
3335 performing this check. */
3339 return walk_subobject_offsets (type
, check_subobject_offset
, offset
,
3340 offsets
, (tree
) (max_node
->key
),
3344 /* DECL is a FIELD_DECL corresponding either to a base subobject of a
3345 non-static data member of the type indicated by RLI. BINFO is the
3346 binfo corresponding to the base subobject, OFFSETS maps offsets to
3347 types already located at those offsets. This function determines
3348 the position of the DECL. */
3351 layout_nonempty_base_or_field (record_layout_info rli
,
3356 tree offset
= NULL_TREE
;
3362 /* For the purposes of determining layout conflicts, we want to
3363 use the class type of BINFO; TREE_TYPE (DECL) will be the
3364 CLASSTYPE_AS_BASE version, which does not contain entries for
3365 zero-sized bases. */
3366 type
= TREE_TYPE (binfo
);
3371 type
= TREE_TYPE (decl
);
3375 /* Try to place the field. It may take more than one try if we have
3376 a hard time placing the field without putting two objects of the
3377 same type at the same address. */
3380 struct record_layout_info_s old_rli
= *rli
;
3382 /* Place this field. */
3383 place_field (rli
, decl
);
3384 offset
= byte_position (decl
);
3386 /* We have to check to see whether or not there is already
3387 something of the same type at the offset we're about to use.
3388 For example, consider:
3391 struct T : public S { int i; };
3392 struct U : public S, public T {};
3394 Here, we put S at offset zero in U. Then, we can't put T at
3395 offset zero -- its S component would be at the same address
3396 as the S we already allocated. So, we have to skip ahead.
3397 Since all data members, including those whose type is an
3398 empty class, have nonzero size, any overlap can happen only
3399 with a direct or indirect base-class -- it can't happen with
3401 /* In a union, overlap is permitted; all members are placed at
3403 if (TREE_CODE (rli
->t
) == UNION_TYPE
)
3405 /* G++ 3.2 did not check for overlaps when placing a non-empty
3407 if (!abi_version_at_least (2) && binfo
&& BINFO_VIRTUAL_P (binfo
))
3409 if (layout_conflict_p (field_p
? type
: binfo
, offset
,
3412 /* Strip off the size allocated to this field. That puts us
3413 at the first place we could have put the field with
3414 proper alignment. */
3417 /* Bump up by the alignment required for the type. */
3419 = size_binop (PLUS_EXPR
, rli
->bitpos
,
3421 ? CLASSTYPE_ALIGN (type
)
3422 : TYPE_ALIGN (type
)));
3423 normalize_rli (rli
);
3426 /* There was no conflict. We're done laying out this field. */
3430 /* Now that we know where it will be placed, update its
3432 if (binfo
&& CLASS_TYPE_P (BINFO_TYPE (binfo
)))
3433 /* Indirect virtual bases may have a nonzero BINFO_OFFSET at
3434 this point because their BINFO_OFFSET is copied from another
3435 hierarchy. Therefore, we may not need to add the entire
3437 propagate_binfo_offsets (binfo
,
3438 size_diffop (convert (ssizetype
, offset
),
3440 BINFO_OFFSET (binfo
))));
3443 /* Returns true if TYPE is empty and OFFSET is nonzero. */
3446 empty_base_at_nonzero_offset_p (tree type
,
3448 splay_tree offsets ATTRIBUTE_UNUSED
)
3450 return is_empty_class (type
) && !integer_zerop (offset
);
3453 /* Layout the empty base BINFO. EOC indicates the byte currently just
3454 past the end of the class, and should be correctly aligned for a
3455 class of the type indicated by BINFO; OFFSETS gives the offsets of
3456 the empty bases allocated so far. T is the most derived
3457 type. Return nonzero iff we added it at the end. */
3460 layout_empty_base (tree binfo
, tree eoc
, splay_tree offsets
)
3463 tree basetype
= BINFO_TYPE (binfo
);
3466 /* This routine should only be used for empty classes. */
3467 gcc_assert (is_empty_class (basetype
));
3468 alignment
= ssize_int (CLASSTYPE_ALIGN_UNIT (basetype
));
3470 if (!integer_zerop (BINFO_OFFSET (binfo
)))
3472 if (abi_version_at_least (2))
3473 propagate_binfo_offsets
3474 (binfo
, size_diffop (size_zero_node
, BINFO_OFFSET (binfo
)));
3476 warning ("offset of empty base %qT may not be ABI-compliant and may"
3477 "change in a future version of GCC",
3478 BINFO_TYPE (binfo
));
3481 /* This is an empty base class. We first try to put it at offset
3483 if (layout_conflict_p (binfo
,
3484 BINFO_OFFSET (binfo
),
3488 /* That didn't work. Now, we move forward from the next
3489 available spot in the class. */
3491 propagate_binfo_offsets (binfo
, convert (ssizetype
, eoc
));
3494 if (!layout_conflict_p (binfo
,
3495 BINFO_OFFSET (binfo
),
3498 /* We finally found a spot where there's no overlap. */
3501 /* There's overlap here, too. Bump along to the next spot. */
3502 propagate_binfo_offsets (binfo
, alignment
);
3508 /* Layout the the base given by BINFO in the class indicated by RLI.
3509 *BASE_ALIGN is a running maximum of the alignments of
3510 any base class. OFFSETS gives the location of empty base
3511 subobjects. T is the most derived type. Return nonzero if the new
3512 object cannot be nearly-empty. A new FIELD_DECL is inserted at
3513 *NEXT_FIELD, unless BINFO is for an empty base class.
3515 Returns the location at which the next field should be inserted. */
3518 build_base_field (record_layout_info rli
, tree binfo
,
3519 splay_tree offsets
, tree
*next_field
)
3522 tree basetype
= BINFO_TYPE (binfo
);
3524 if (!COMPLETE_TYPE_P (basetype
))
3525 /* This error is now reported in xref_tag, thus giving better
3526 location information. */
3529 /* Place the base class. */
3530 if (!is_empty_class (basetype
))
3534 /* The containing class is non-empty because it has a non-empty
3536 CLASSTYPE_EMPTY_P (t
) = 0;
3538 /* Create the FIELD_DECL. */
3539 decl
= build_decl (FIELD_DECL
, NULL_TREE
, CLASSTYPE_AS_BASE (basetype
));
3540 DECL_ARTIFICIAL (decl
) = 1;
3541 DECL_IGNORED_P (decl
) = 1;
3542 DECL_FIELD_CONTEXT (decl
) = t
;
3543 DECL_SIZE (decl
) = CLASSTYPE_SIZE (basetype
);
3544 DECL_SIZE_UNIT (decl
) = CLASSTYPE_SIZE_UNIT (basetype
);
3545 DECL_ALIGN (decl
) = CLASSTYPE_ALIGN (basetype
);
3546 DECL_USER_ALIGN (decl
) = CLASSTYPE_USER_ALIGN (basetype
);
3547 DECL_MODE (decl
) = TYPE_MODE (basetype
);
3548 DECL_FIELD_IS_BASE (decl
) = 1;
3550 /* Try to place the field. It may take more than one try if we
3551 have a hard time placing the field without putting two
3552 objects of the same type at the same address. */
3553 layout_nonempty_base_or_field (rli
, decl
, binfo
, offsets
);
3554 /* Add the new FIELD_DECL to the list of fields for T. */
3555 TREE_CHAIN (decl
) = *next_field
;
3557 next_field
= &TREE_CHAIN (decl
);
3564 /* On some platforms (ARM), even empty classes will not be
3566 eoc
= round_up (rli_size_unit_so_far (rli
),
3567 CLASSTYPE_ALIGN_UNIT (basetype
));
3568 atend
= layout_empty_base (binfo
, eoc
, offsets
);
3569 /* A nearly-empty class "has no proper base class that is empty,
3570 not morally virtual, and at an offset other than zero." */
3571 if (!BINFO_VIRTUAL_P (binfo
) && CLASSTYPE_NEARLY_EMPTY_P (t
))
3574 CLASSTYPE_NEARLY_EMPTY_P (t
) = 0;
3575 /* The check above (used in G++ 3.2) is insufficient because
3576 an empty class placed at offset zero might itself have an
3577 empty base at a nonzero offset. */
3578 else if (walk_subobject_offsets (basetype
,
3579 empty_base_at_nonzero_offset_p
,
3582 /*max_offset=*/NULL_TREE
,
3585 if (abi_version_at_least (2))
3586 CLASSTYPE_NEARLY_EMPTY_P (t
) = 0;
3588 warning ("class %qT will be considered nearly empty in a "
3589 "future version of GCC", t
);
3593 /* We do not create a FIELD_DECL for empty base classes because
3594 it might overlap some other field. We want to be able to
3595 create CONSTRUCTORs for the class by iterating over the
3596 FIELD_DECLs, and the back end does not handle overlapping
3599 /* An empty virtual base causes a class to be non-empty
3600 -- but in that case we do not need to clear CLASSTYPE_EMPTY_P
3601 here because that was already done when the virtual table
3602 pointer was created. */
3605 /* Record the offsets of BINFO and its base subobjects. */
3606 record_subobject_offsets (binfo
,
3607 BINFO_OFFSET (binfo
),
3614 /* Layout all of the non-virtual base classes. Record empty
3615 subobjects in OFFSETS. T is the most derived type. Return nonzero
3616 if the type cannot be nearly empty. The fields created
3617 corresponding to the base classes will be inserted at
3621 build_base_fields (record_layout_info rli
,
3622 splay_tree offsets
, tree
*next_field
)
3624 /* Chain to hold all the new FIELD_DECLs which stand in for base class
3627 int n_baseclasses
= BINFO_N_BASE_BINFOS (TYPE_BINFO (t
));
3630 /* The primary base class is always allocated first. */
3631 if (CLASSTYPE_HAS_PRIMARY_BASE_P (t
))
3632 next_field
= build_base_field (rli
, CLASSTYPE_PRIMARY_BINFO (t
),
3633 offsets
, next_field
);
3635 /* Now allocate the rest of the bases. */
3636 for (i
= 0; i
< n_baseclasses
; ++i
)
3640 base_binfo
= BINFO_BASE_BINFO (TYPE_BINFO (t
), i
);
3642 /* The primary base was already allocated above, so we don't
3643 need to allocate it again here. */
3644 if (base_binfo
== CLASSTYPE_PRIMARY_BINFO (t
))
3647 /* Virtual bases are added at the end (a primary virtual base
3648 will have already been added). */
3649 if (BINFO_VIRTUAL_P (base_binfo
))
3652 next_field
= build_base_field (rli
, base_binfo
,
3653 offsets
, next_field
);
3657 /* Go through the TYPE_METHODS of T issuing any appropriate
3658 diagnostics, figuring out which methods override which other
3659 methods, and so forth. */
3662 check_methods (tree t
)
3666 for (x
= TYPE_METHODS (t
); x
; x
= TREE_CHAIN (x
))
3668 check_for_override (x
, t
);
3669 if (DECL_PURE_VIRTUAL_P (x
) && ! DECL_VINDEX (x
))
3670 cp_error_at ("initializer specified for non-virtual method %qD", x
);
3671 /* The name of the field is the original field name
3672 Save this in auxiliary field for later overloading. */
3673 if (DECL_VINDEX (x
))
3675 TYPE_POLYMORPHIC_P (t
) = 1;
3676 if (DECL_PURE_VIRTUAL_P (x
))
3677 VEC_safe_push (tree
, CLASSTYPE_PURE_VIRTUALS (t
), x
);
3679 /* All user-declared destructors are non-trivial. */
3680 if (DECL_DESTRUCTOR_P (x
))
3681 TYPE_HAS_NONTRIVIAL_DESTRUCTOR (t
) = 1;
3685 /* FN is a constructor or destructor. Clone the declaration to create
3686 a specialized in-charge or not-in-charge version, as indicated by
3690 build_clone (tree fn
, tree name
)
3695 /* Copy the function. */
3696 clone
= copy_decl (fn
);
3697 /* Remember where this function came from. */
3698 DECL_CLONED_FUNCTION (clone
) = fn
;
3699 DECL_ABSTRACT_ORIGIN (clone
) = fn
;
3700 /* Reset the function name. */
3701 DECL_NAME (clone
) = name
;
3702 SET_DECL_ASSEMBLER_NAME (clone
, NULL_TREE
);
3703 /* There's no pending inline data for this function. */
3704 DECL_PENDING_INLINE_INFO (clone
) = NULL
;
3705 DECL_PENDING_INLINE_P (clone
) = 0;
3706 /* And it hasn't yet been deferred. */
3707 DECL_DEFERRED_FN (clone
) = 0;
3709 /* The base-class destructor is not virtual. */
3710 if (name
== base_dtor_identifier
)
3712 DECL_VIRTUAL_P (clone
) = 0;
3713 if (TREE_CODE (clone
) != TEMPLATE_DECL
)
3714 DECL_VINDEX (clone
) = NULL_TREE
;
3717 /* If there was an in-charge parameter, drop it from the function
3719 if (DECL_HAS_IN_CHARGE_PARM_P (clone
))
3725 exceptions
= TYPE_RAISES_EXCEPTIONS (TREE_TYPE (clone
));
3726 basetype
= TYPE_METHOD_BASETYPE (TREE_TYPE (clone
));
3727 parmtypes
= TYPE_ARG_TYPES (TREE_TYPE (clone
));
3728 /* Skip the `this' parameter. */
3729 parmtypes
= TREE_CHAIN (parmtypes
);
3730 /* Skip the in-charge parameter. */
3731 parmtypes
= TREE_CHAIN (parmtypes
);
3732 /* And the VTT parm, in a complete [cd]tor. */
3733 if (DECL_HAS_VTT_PARM_P (fn
)
3734 && ! DECL_NEEDS_VTT_PARM_P (clone
))
3735 parmtypes
= TREE_CHAIN (parmtypes
);
3736 /* If this is subobject constructor or destructor, add the vtt
3739 = build_method_type_directly (basetype
,
3740 TREE_TYPE (TREE_TYPE (clone
)),
3743 TREE_TYPE (clone
) = build_exception_variant (TREE_TYPE (clone
),
3746 = cp_build_type_attribute_variant (TREE_TYPE (clone
),
3747 TYPE_ATTRIBUTES (TREE_TYPE (fn
)));
3750 /* Copy the function parameters. But, DECL_ARGUMENTS on a TEMPLATE_DECL
3751 aren't function parameters; those are the template parameters. */
3752 if (TREE_CODE (clone
) != TEMPLATE_DECL
)
3754 DECL_ARGUMENTS (clone
) = copy_list (DECL_ARGUMENTS (clone
));
3755 /* Remove the in-charge parameter. */
3756 if (DECL_HAS_IN_CHARGE_PARM_P (clone
))
3758 TREE_CHAIN (DECL_ARGUMENTS (clone
))
3759 = TREE_CHAIN (TREE_CHAIN (DECL_ARGUMENTS (clone
)));
3760 DECL_HAS_IN_CHARGE_PARM_P (clone
) = 0;
3762 /* And the VTT parm, in a complete [cd]tor. */
3763 if (DECL_HAS_VTT_PARM_P (fn
))
3765 if (DECL_NEEDS_VTT_PARM_P (clone
))
3766 DECL_HAS_VTT_PARM_P (clone
) = 1;
3769 TREE_CHAIN (DECL_ARGUMENTS (clone
))
3770 = TREE_CHAIN (TREE_CHAIN (DECL_ARGUMENTS (clone
)));
3771 DECL_HAS_VTT_PARM_P (clone
) = 0;
3775 for (parms
= DECL_ARGUMENTS (clone
); parms
; parms
= TREE_CHAIN (parms
))
3777 DECL_CONTEXT (parms
) = clone
;
3778 cxx_dup_lang_specific_decl (parms
);
3782 /* Create the RTL for this function. */
3783 SET_DECL_RTL (clone
, NULL_RTX
);
3784 rest_of_decl_compilation (clone
, /*top_level=*/1, at_eof
);
3786 /* Make it easy to find the CLONE given the FN. */
3787 TREE_CHAIN (clone
) = TREE_CHAIN (fn
);
3788 TREE_CHAIN (fn
) = clone
;
3790 /* If this is a template, handle the DECL_TEMPLATE_RESULT as well. */
3791 if (TREE_CODE (clone
) == TEMPLATE_DECL
)
3795 DECL_TEMPLATE_RESULT (clone
)
3796 = build_clone (DECL_TEMPLATE_RESULT (clone
), name
);
3797 result
= DECL_TEMPLATE_RESULT (clone
);
3798 DECL_TEMPLATE_INFO (result
) = copy_node (DECL_TEMPLATE_INFO (result
));
3799 DECL_TI_TEMPLATE (result
) = clone
;
3802 note_decl_for_pch (clone
);
3807 /* Produce declarations for all appropriate clones of FN. If
3808 UPDATE_METHOD_VEC_P is nonzero, the clones are added to the
3809 CLASTYPE_METHOD_VEC as well. */
3812 clone_function_decl (tree fn
, int update_method_vec_p
)
3816 /* Avoid inappropriate cloning. */
3818 && DECL_CLONED_FUNCTION (TREE_CHAIN (fn
)))
3821 if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (fn
))
3823 /* For each constructor, we need two variants: an in-charge version
3824 and a not-in-charge version. */
3825 clone
= build_clone (fn
, complete_ctor_identifier
);
3826 if (update_method_vec_p
)
3827 add_method (DECL_CONTEXT (clone
), clone
);
3828 clone
= build_clone (fn
, base_ctor_identifier
);
3829 if (update_method_vec_p
)
3830 add_method (DECL_CONTEXT (clone
), clone
);
3834 gcc_assert (DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P (fn
));
3836 /* For each destructor, we need three variants: an in-charge
3837 version, a not-in-charge version, and an in-charge deleting
3838 version. We clone the deleting version first because that
3839 means it will go second on the TYPE_METHODS list -- and that
3840 corresponds to the correct layout order in the virtual
3843 For a non-virtual destructor, we do not build a deleting
3845 if (DECL_VIRTUAL_P (fn
))
3847 clone
= build_clone (fn
, deleting_dtor_identifier
);
3848 if (update_method_vec_p
)
3849 add_method (DECL_CONTEXT (clone
), clone
);
3851 clone
= build_clone (fn
, complete_dtor_identifier
);
3852 if (update_method_vec_p
)
3853 add_method (DECL_CONTEXT (clone
), clone
);
3854 clone
= build_clone (fn
, base_dtor_identifier
);
3855 if (update_method_vec_p
)
3856 add_method (DECL_CONTEXT (clone
), clone
);
3859 /* Note that this is an abstract function that is never emitted. */
3860 DECL_ABSTRACT (fn
) = 1;
3863 /* DECL is an in charge constructor, which is being defined. This will
3864 have had an in class declaration, from whence clones were
3865 declared. An out-of-class definition can specify additional default
3866 arguments. As it is the clones that are involved in overload
3867 resolution, we must propagate the information from the DECL to its
3871 adjust_clone_args (tree decl
)
3875 for (clone
= TREE_CHAIN (decl
); clone
&& DECL_CLONED_FUNCTION (clone
);
3876 clone
= TREE_CHAIN (clone
))
3878 tree orig_clone_parms
= TYPE_ARG_TYPES (TREE_TYPE (clone
));
3879 tree orig_decl_parms
= TYPE_ARG_TYPES (TREE_TYPE (decl
));
3880 tree decl_parms
, clone_parms
;
3882 clone_parms
= orig_clone_parms
;
3884 /* Skip the 'this' parameter. */
3885 orig_clone_parms
= TREE_CHAIN (orig_clone_parms
);
3886 orig_decl_parms
= TREE_CHAIN (orig_decl_parms
);
3888 if (DECL_HAS_IN_CHARGE_PARM_P (decl
))
3889 orig_decl_parms
= TREE_CHAIN (orig_decl_parms
);
3890 if (DECL_HAS_VTT_PARM_P (decl
))
3891 orig_decl_parms
= TREE_CHAIN (orig_decl_parms
);
3893 clone_parms
= orig_clone_parms
;
3894 if (DECL_HAS_VTT_PARM_P (clone
))
3895 clone_parms
= TREE_CHAIN (clone_parms
);
3897 for (decl_parms
= orig_decl_parms
; decl_parms
;
3898 decl_parms
= TREE_CHAIN (decl_parms
),
3899 clone_parms
= TREE_CHAIN (clone_parms
))
3901 gcc_assert (same_type_p (TREE_TYPE (decl_parms
),
3902 TREE_TYPE (clone_parms
)));
3904 if (TREE_PURPOSE (decl_parms
) && !TREE_PURPOSE (clone_parms
))
3906 /* A default parameter has been added. Adjust the
3907 clone's parameters. */
3908 tree exceptions
= TYPE_RAISES_EXCEPTIONS (TREE_TYPE (clone
));
3909 tree basetype
= TYPE_METHOD_BASETYPE (TREE_TYPE (clone
));
3912 clone_parms
= orig_decl_parms
;
3914 if (DECL_HAS_VTT_PARM_P (clone
))
3916 clone_parms
= tree_cons (TREE_PURPOSE (orig_clone_parms
),
3917 TREE_VALUE (orig_clone_parms
),
3919 TREE_TYPE (clone_parms
) = TREE_TYPE (orig_clone_parms
);
3921 type
= build_method_type_directly (basetype
,
3922 TREE_TYPE (TREE_TYPE (clone
)),
3925 type
= build_exception_variant (type
, exceptions
);
3926 TREE_TYPE (clone
) = type
;
3928 clone_parms
= NULL_TREE
;
3932 gcc_assert (!clone_parms
);
3936 /* For each of the constructors and destructors in T, create an
3937 in-charge and not-in-charge variant. */
3940 clone_constructors_and_destructors (tree t
)
3944 /* If for some reason we don't have a CLASSTYPE_METHOD_VEC, we bail
3946 if (!CLASSTYPE_METHOD_VEC (t
))
3949 for (fns
= CLASSTYPE_CONSTRUCTORS (t
); fns
; fns
= OVL_NEXT (fns
))
3950 clone_function_decl (OVL_CURRENT (fns
), /*update_method_vec_p=*/1);
3951 for (fns
= CLASSTYPE_DESTRUCTORS (t
); fns
; fns
= OVL_NEXT (fns
))
3952 clone_function_decl (OVL_CURRENT (fns
), /*update_method_vec_p=*/1);
3955 /* Remove all zero-width bit-fields from T. */
3958 remove_zero_width_bit_fields (tree t
)
3962 fieldsp
= &TYPE_FIELDS (t
);
3965 if (TREE_CODE (*fieldsp
) == FIELD_DECL
3966 && DECL_C_BIT_FIELD (*fieldsp
)
3967 && DECL_INITIAL (*fieldsp
))
3968 *fieldsp
= TREE_CHAIN (*fieldsp
);
3970 fieldsp
= &TREE_CHAIN (*fieldsp
);
3974 /* Returns TRUE iff we need a cookie when dynamically allocating an
3975 array whose elements have the indicated class TYPE. */
3978 type_requires_array_cookie (tree type
)
3981 bool has_two_argument_delete_p
= false;
3983 gcc_assert (CLASS_TYPE_P (type
));
3985 /* If there's a non-trivial destructor, we need a cookie. In order
3986 to iterate through the array calling the destructor for each
3987 element, we'll have to know how many elements there are. */
3988 if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type
))
3991 /* If the usual deallocation function is a two-argument whose second
3992 argument is of type `size_t', then we have to pass the size of
3993 the array to the deallocation function, so we will need to store
3995 fns
= lookup_fnfields (TYPE_BINFO (type
),
3996 ansi_opname (VEC_DELETE_EXPR
),
3998 /* If there are no `operator []' members, or the lookup is
3999 ambiguous, then we don't need a cookie. */
4000 if (!fns
|| fns
== error_mark_node
)
4002 /* Loop through all of the functions. */
4003 for (fns
= BASELINK_FUNCTIONS (fns
); fns
; fns
= OVL_NEXT (fns
))
4008 /* Select the current function. */
4009 fn
= OVL_CURRENT (fns
);
4010 /* See if this function is a one-argument delete function. If
4011 it is, then it will be the usual deallocation function. */
4012 second_parm
= TREE_CHAIN (TYPE_ARG_TYPES (TREE_TYPE (fn
)));
4013 if (second_parm
== void_list_node
)
4015 /* Otherwise, if we have a two-argument function and the second
4016 argument is `size_t', it will be the usual deallocation
4017 function -- unless there is one-argument function, too. */
4018 if (TREE_CHAIN (second_parm
) == void_list_node
4019 && same_type_p (TREE_VALUE (second_parm
), sizetype
))
4020 has_two_argument_delete_p
= true;
4023 return has_two_argument_delete_p
;
4026 /* Check the validity of the bases and members declared in T. Add any
4027 implicitly-generated functions (like copy-constructors and
4028 assignment operators). Compute various flag bits (like
4029 CLASSTYPE_NON_POD_T) for T. This routine works purely at the C++
4030 level: i.e., independently of the ABI in use. */
4033 check_bases_and_members (tree t
)
4035 /* Nonzero if the implicitly generated copy constructor should take
4036 a non-const reference argument. */
4037 int cant_have_const_ctor
;
4038 /* Nonzero if the the implicitly generated assignment operator
4039 should take a non-const reference argument. */
4040 int no_const_asn_ref
;
4043 /* By default, we use const reference arguments and generate default
4045 cant_have_const_ctor
= 0;
4046 no_const_asn_ref
= 0;
4048 /* Check all the base-classes. */
4049 check_bases (t
, &cant_have_const_ctor
,
4052 /* Check all the method declarations. */
4055 /* Check all the data member declarations. We cannot call
4056 check_field_decls until we have called check_bases check_methods,
4057 as check_field_decls depends on TYPE_HAS_NONTRIVIAL_DESTRUCTOR
4058 being set appropriately. */
4059 check_field_decls (t
, &access_decls
,
4060 &cant_have_const_ctor
,
4063 /* A nearly-empty class has to be vptr-containing; a nearly empty
4064 class contains just a vptr. */
4065 if (!TYPE_CONTAINS_VPTR_P (t
))
4066 CLASSTYPE_NEARLY_EMPTY_P (t
) = 0;
4068 /* Do some bookkeeping that will guide the generation of implicitly
4069 declared member functions. */
4070 TYPE_HAS_COMPLEX_INIT_REF (t
)
4071 |= (TYPE_HAS_INIT_REF (t
) || TYPE_CONTAINS_VPTR_P (t
));
4072 TYPE_NEEDS_CONSTRUCTING (t
)
4073 |= (TYPE_HAS_CONSTRUCTOR (t
) || TYPE_CONTAINS_VPTR_P (t
));
4074 CLASSTYPE_NON_AGGREGATE (t
)
4075 |= (TYPE_HAS_CONSTRUCTOR (t
) || TYPE_POLYMORPHIC_P (t
));
4076 CLASSTYPE_NON_POD_P (t
)
4077 |= (CLASSTYPE_NON_AGGREGATE (t
)
4078 || TYPE_HAS_NONTRIVIAL_DESTRUCTOR (t
)
4079 || TYPE_HAS_ASSIGN_REF (t
));
4080 TYPE_HAS_COMPLEX_ASSIGN_REF (t
)
4081 |= TYPE_HAS_ASSIGN_REF (t
) || TYPE_CONTAINS_VPTR_P (t
);
4083 /* Synthesize any needed methods. */
4084 add_implicitly_declared_members (t
,
4085 cant_have_const_ctor
,
4088 /* Create the in-charge and not-in-charge variants of constructors
4090 clone_constructors_and_destructors (t
);
4092 /* Process the using-declarations. */
4093 for (; access_decls
; access_decls
= TREE_CHAIN (access_decls
))
4094 handle_using_decl (TREE_VALUE (access_decls
), t
);
4096 /* Build and sort the CLASSTYPE_METHOD_VEC. */
4097 finish_struct_methods (t
);
4099 /* Figure out whether or not we will need a cookie when dynamically
4100 allocating an array of this type. */
4101 TYPE_LANG_SPECIFIC (t
)->u
.c
.vec_new_uses_cookie
4102 = type_requires_array_cookie (t
);
4105 /* If T needs a pointer to its virtual function table, set TYPE_VFIELD
4106 accordingly. If a new vfield was created (because T doesn't have a
4107 primary base class), then the newly created field is returned. It
4108 is not added to the TYPE_FIELDS list; it is the caller's
4109 responsibility to do that. Accumulate declared virtual functions
4113 create_vtable_ptr (tree t
, tree
* virtuals_p
)
4117 /* Collect the virtual functions declared in T. */
4118 for (fn
= TYPE_METHODS (t
); fn
; fn
= TREE_CHAIN (fn
))
4119 if (DECL_VINDEX (fn
) && !DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P (fn
)
4120 && TREE_CODE (DECL_VINDEX (fn
)) != INTEGER_CST
)
4122 tree new_virtual
= make_node (TREE_LIST
);
4124 BV_FN (new_virtual
) = fn
;
4125 BV_DELTA (new_virtual
) = integer_zero_node
;
4126 BV_VCALL_INDEX (new_virtual
) = NULL_TREE
;
4128 TREE_CHAIN (new_virtual
) = *virtuals_p
;
4129 *virtuals_p
= new_virtual
;
4132 /* If we couldn't find an appropriate base class, create a new field
4133 here. Even if there weren't any new virtual functions, we might need a
4134 new virtual function table if we're supposed to include vptrs in
4135 all classes that need them. */
4136 if (!TYPE_VFIELD (t
) && (*virtuals_p
|| TYPE_CONTAINS_VPTR_P (t
)))
4138 /* We build this decl with vtbl_ptr_type_node, which is a
4139 `vtable_entry_type*'. It might seem more precise to use
4140 `vtable_entry_type (*)[N]' where N is the number of virtual
4141 functions. However, that would require the vtable pointer in
4142 base classes to have a different type than the vtable pointer
4143 in derived classes. We could make that happen, but that
4144 still wouldn't solve all the problems. In particular, the
4145 type-based alias analysis code would decide that assignments
4146 to the base class vtable pointer can't alias assignments to
4147 the derived class vtable pointer, since they have different
4148 types. Thus, in a derived class destructor, where the base
4149 class constructor was inlined, we could generate bad code for
4150 setting up the vtable pointer.
4152 Therefore, we use one type for all vtable pointers. We still
4153 use a type-correct type; it's just doesn't indicate the array
4154 bounds. That's better than using `void*' or some such; it's
4155 cleaner, and it let's the alias analysis code know that these
4156 stores cannot alias stores to void*! */
4159 field
= build_decl (FIELD_DECL
, get_vfield_name (t
), vtbl_ptr_type_node
);
4160 SET_DECL_ASSEMBLER_NAME (field
, get_identifier (VFIELD_BASE
));
4161 DECL_VIRTUAL_P (field
) = 1;
4162 DECL_ARTIFICIAL (field
) = 1;
4163 DECL_FIELD_CONTEXT (field
) = t
;
4164 DECL_FCONTEXT (field
) = t
;
4166 TYPE_VFIELD (t
) = field
;
4168 /* This class is non-empty. */
4169 CLASSTYPE_EMPTY_P (t
) = 0;
4177 /* Fixup the inline function given by INFO now that the class is
4181 fixup_pending_inline (tree fn
)
4183 if (DECL_PENDING_INLINE_INFO (fn
))
4185 tree args
= DECL_ARGUMENTS (fn
);
4188 DECL_CONTEXT (args
) = fn
;
4189 args
= TREE_CHAIN (args
);
4194 /* Fixup the inline methods and friends in TYPE now that TYPE is
4198 fixup_inline_methods (tree type
)
4200 tree method
= TYPE_METHODS (type
);
4201 VEC (tree
) *friends
;
4204 if (method
&& TREE_CODE (method
) == TREE_VEC
)
4206 if (TREE_VEC_ELT (method
, 1))
4207 method
= TREE_VEC_ELT (method
, 1);
4208 else if (TREE_VEC_ELT (method
, 0))
4209 method
= TREE_VEC_ELT (method
, 0);
4211 method
= TREE_VEC_ELT (method
, 2);
4214 /* Do inline member functions. */
4215 for (; method
; method
= TREE_CHAIN (method
))
4216 fixup_pending_inline (method
);
4219 for (friends
= CLASSTYPE_INLINE_FRIENDS (type
), ix
= 0;
4220 VEC_iterate (tree
, friends
, ix
, method
); ix
++)
4221 fixup_pending_inline (method
);
4222 CLASSTYPE_INLINE_FRIENDS (type
) = NULL
;
4225 /* Add OFFSET to all base types of BINFO which is a base in the
4226 hierarchy dominated by T.
4228 OFFSET, which is a type offset, is number of bytes. */
4231 propagate_binfo_offsets (tree binfo
, tree offset
)
4237 /* Update BINFO's offset. */
4238 BINFO_OFFSET (binfo
)
4239 = convert (sizetype
,
4240 size_binop (PLUS_EXPR
,
4241 convert (ssizetype
, BINFO_OFFSET (binfo
)),
4244 /* Find the primary base class. */
4245 primary_binfo
= get_primary_binfo (binfo
);
4247 if (primary_binfo
&& BINFO_INHERITANCE_CHAIN (primary_binfo
) == binfo
)
4248 propagate_binfo_offsets (primary_binfo
, offset
);
4250 /* Scan all of the bases, pushing the BINFO_OFFSET adjust
4252 for (i
= 0; BINFO_BASE_ITERATE (binfo
, i
, base_binfo
); ++i
)
4254 /* Don't do the primary base twice. */
4255 if (base_binfo
== primary_binfo
)
4258 if (BINFO_VIRTUAL_P (base_binfo
))
4261 propagate_binfo_offsets (base_binfo
, offset
);
4265 /* Set BINFO_OFFSET for all of the virtual bases for RLI->T. Update
4266 TYPE_ALIGN and TYPE_SIZE for T. OFFSETS gives the location of
4267 empty subobjects of T. */
4270 layout_virtual_bases (record_layout_info rli
, splay_tree offsets
)
4274 bool first_vbase
= true;
4277 if (BINFO_N_BASE_BINFOS (TYPE_BINFO (t
)) == 0)
4280 if (!abi_version_at_least(2))
4282 /* In G++ 3.2, we incorrectly rounded the size before laying out
4283 the virtual bases. */
4284 finish_record_layout (rli
, /*free_p=*/false);
4285 #ifdef STRUCTURE_SIZE_BOUNDARY
4286 /* Packed structures don't need to have minimum size. */
4287 if (! TYPE_PACKED (t
))
4288 TYPE_ALIGN (t
) = MAX (TYPE_ALIGN (t
), (unsigned) STRUCTURE_SIZE_BOUNDARY
);
4290 rli
->offset
= TYPE_SIZE_UNIT (t
);
4291 rli
->bitpos
= bitsize_zero_node
;
4292 rli
->record_align
= TYPE_ALIGN (t
);
4295 /* Find the last field. The artificial fields created for virtual
4296 bases will go after the last extant field to date. */
4297 next_field
= &TYPE_FIELDS (t
);
4299 next_field
= &TREE_CHAIN (*next_field
);
4301 /* Go through the virtual bases, allocating space for each virtual
4302 base that is not already a primary base class. These are
4303 allocated in inheritance graph order. */
4304 for (vbase
= TYPE_BINFO (t
); vbase
; vbase
= TREE_CHAIN (vbase
))
4306 if (!BINFO_VIRTUAL_P (vbase
))
4309 if (!BINFO_PRIMARY_P (vbase
))
4311 tree basetype
= TREE_TYPE (vbase
);
4313 /* This virtual base is not a primary base of any class in the
4314 hierarchy, so we have to add space for it. */
4315 next_field
= build_base_field (rli
, vbase
,
4316 offsets
, next_field
);
4318 /* If the first virtual base might have been placed at a
4319 lower address, had we started from CLASSTYPE_SIZE, rather
4320 than TYPE_SIZE, issue a warning. There can be both false
4321 positives and false negatives from this warning in rare
4322 cases; to deal with all the possibilities would probably
4323 require performing both layout algorithms and comparing
4324 the results which is not particularly tractable. */
4328 (size_binop (CEIL_DIV_EXPR
,
4329 round_up (CLASSTYPE_SIZE (t
),
4330 CLASSTYPE_ALIGN (basetype
)),
4332 BINFO_OFFSET (vbase
))))
4333 warning ("offset of virtual base %qT is not ABI-compliant and "
4334 "may change in a future version of GCC",
4337 first_vbase
= false;
4342 /* Returns the offset of the byte just past the end of the base class
4346 end_of_base (tree binfo
)
4350 if (is_empty_class (BINFO_TYPE (binfo
)))
4351 /* An empty class has zero CLASSTYPE_SIZE_UNIT, but we need to
4352 allocate some space for it. It cannot have virtual bases, so
4353 TYPE_SIZE_UNIT is fine. */
4354 size
= TYPE_SIZE_UNIT (BINFO_TYPE (binfo
));
4356 size
= CLASSTYPE_SIZE_UNIT (BINFO_TYPE (binfo
));
4358 return size_binop (PLUS_EXPR
, BINFO_OFFSET (binfo
), size
);
4361 /* Returns the offset of the byte just past the end of the base class
4362 with the highest offset in T. If INCLUDE_VIRTUALS_P is zero, then
4363 only non-virtual bases are included. */
4366 end_of_class (tree t
, int include_virtuals_p
)
4368 tree result
= size_zero_node
;
4375 for (binfo
= TYPE_BINFO (t
), i
= 0;
4376 BINFO_BASE_ITERATE (binfo
, i
, base_binfo
); ++i
)
4378 if (!include_virtuals_p
4379 && BINFO_VIRTUAL_P (base_binfo
)
4380 && (!BINFO_PRIMARY_P (base_binfo
)
4381 || BINFO_INHERITANCE_CHAIN (base_binfo
) != TYPE_BINFO (t
)))
4384 offset
= end_of_base (base_binfo
);
4385 if (INT_CST_LT_UNSIGNED (result
, offset
))
4389 /* G++ 3.2 did not check indirect virtual bases. */
4390 if (abi_version_at_least (2) && include_virtuals_p
)
4391 for (vbases
= CLASSTYPE_VBASECLASSES (t
), i
= 0;
4392 VEC_iterate (tree
, vbases
, i
, base_binfo
); i
++)
4394 offset
= end_of_base (base_binfo
);
4395 if (INT_CST_LT_UNSIGNED (result
, offset
))
4402 /* Warn about bases of T that are inaccessible because they are
4403 ambiguous. For example:
4406 struct T : public S {};
4407 struct U : public S, public T {};
4409 Here, `(S*) new U' is not allowed because there are two `S'
4413 warn_about_ambiguous_bases (tree t
)
4421 /* If there are no repeated bases, nothing can be ambiguous. */
4422 if (!CLASSTYPE_REPEATED_BASE_P (t
))
4425 /* Check direct bases. */
4426 for (binfo
= TYPE_BINFO (t
), i
= 0;
4427 BINFO_BASE_ITERATE (binfo
, i
, base_binfo
); ++i
)
4429 basetype
= BINFO_TYPE (base_binfo
);
4431 if (!lookup_base (t
, basetype
, ba_unique
| ba_quiet
, NULL
))
4432 warning ("direct base %qT inaccessible in %qT due to ambiguity",
4436 /* Check for ambiguous virtual bases. */
4438 for (vbases
= CLASSTYPE_VBASECLASSES (t
), i
= 0;
4439 VEC_iterate (tree
, vbases
, i
, binfo
); i
++)
4441 basetype
= BINFO_TYPE (binfo
);
4443 if (!lookup_base (t
, basetype
, ba_unique
| ba_quiet
, NULL
))
4444 warning ("virtual base %qT inaccessible in %qT due to ambiguity",
4449 /* Compare two INTEGER_CSTs K1 and K2. */
4452 splay_tree_compare_integer_csts (splay_tree_key k1
, splay_tree_key k2
)
4454 return tree_int_cst_compare ((tree
) k1
, (tree
) k2
);
4457 /* Increase the size indicated in RLI to account for empty classes
4458 that are "off the end" of the class. */
4461 include_empty_classes (record_layout_info rli
)
4466 /* It might be the case that we grew the class to allocate a
4467 zero-sized base class. That won't be reflected in RLI, yet,
4468 because we are willing to overlay multiple bases at the same
4469 offset. However, now we need to make sure that RLI is big enough
4470 to reflect the entire class. */
4471 eoc
= end_of_class (rli
->t
,
4472 CLASSTYPE_AS_BASE (rli
->t
) != NULL_TREE
);
4473 rli_size
= rli_size_unit_so_far (rli
);
4474 if (TREE_CODE (rli_size
) == INTEGER_CST
4475 && INT_CST_LT_UNSIGNED (rli_size
, eoc
))
4477 if (!abi_version_at_least (2))
4478 /* In version 1 of the ABI, the size of a class that ends with
4479 a bitfield was not rounded up to a whole multiple of a
4480 byte. Because rli_size_unit_so_far returns only the number
4481 of fully allocated bytes, any extra bits were not included
4483 rli
->bitpos
= round_down (rli
->bitpos
, BITS_PER_UNIT
);
4485 /* The size should have been rounded to a whole byte. */
4486 gcc_assert (tree_int_cst_equal
4487 (rli
->bitpos
, round_down (rli
->bitpos
, BITS_PER_UNIT
)));
4489 = size_binop (PLUS_EXPR
,
4491 size_binop (MULT_EXPR
,
4492 convert (bitsizetype
,
4493 size_binop (MINUS_EXPR
,
4495 bitsize_int (BITS_PER_UNIT
)));
4496 normalize_rli (rli
);
4500 /* Calculate the TYPE_SIZE, TYPE_ALIGN, etc for T. Calculate
4501 BINFO_OFFSETs for all of the base-classes. Position the vtable
4502 pointer. Accumulate declared virtual functions on VIRTUALS_P. */
4505 layout_class_type (tree t
, tree
*virtuals_p
)
4507 tree non_static_data_members
;
4510 record_layout_info rli
;
4511 /* Maps offsets (represented as INTEGER_CSTs) to a TREE_LIST of
4512 types that appear at that offset. */
4513 splay_tree empty_base_offsets
;
4514 /* True if the last field layed out was a bit-field. */
4515 bool last_field_was_bitfield
= false;
4516 /* The location at which the next field should be inserted. */
4518 /* T, as a base class. */
4521 /* Keep track of the first non-static data member. */
4522 non_static_data_members
= TYPE_FIELDS (t
);
4524 /* Start laying out the record. */
4525 rli
= start_record_layout (t
);
4527 /* Mark all the primary bases in the hierarchy. */
4528 determine_primary_bases (t
);
4530 /* Create a pointer to our virtual function table. */
4531 vptr
= create_vtable_ptr (t
, virtuals_p
);
4533 /* The vptr is always the first thing in the class. */
4536 TREE_CHAIN (vptr
) = TYPE_FIELDS (t
);
4537 TYPE_FIELDS (t
) = vptr
;
4538 next_field
= &TREE_CHAIN (vptr
);
4539 place_field (rli
, vptr
);
4542 next_field
= &TYPE_FIELDS (t
);
4544 /* Build FIELD_DECLs for all of the non-virtual base-types. */
4545 empty_base_offsets
= splay_tree_new (splay_tree_compare_integer_csts
,
4547 build_base_fields (rli
, empty_base_offsets
, next_field
);
4549 /* Layout the non-static data members. */
4550 for (field
= non_static_data_members
; field
; field
= TREE_CHAIN (field
))
4555 /* We still pass things that aren't non-static data members to
4556 the back-end, in case it wants to do something with them. */
4557 if (TREE_CODE (field
) != FIELD_DECL
)
4559 place_field (rli
, field
);
4560 /* If the static data member has incomplete type, keep track
4561 of it so that it can be completed later. (The handling
4562 of pending statics in finish_record_layout is
4563 insufficient; consider:
4566 struct S2 { static S1 s1; };
4568 At this point, finish_record_layout will be called, but
4569 S1 is still incomplete.) */
4570 if (TREE_CODE (field
) == VAR_DECL
)
4572 maybe_register_incomplete_var (field
);
4573 /* The visibility of static data members is determined
4574 at their point of declaration, not their point of
4576 determine_visibility (field
);
4581 type
= TREE_TYPE (field
);
4583 padding
= NULL_TREE
;
4585 /* If this field is a bit-field whose width is greater than its
4586 type, then there are some special rules for allocating
4588 if (DECL_C_BIT_FIELD (field
)
4589 && INT_CST_LT (TYPE_SIZE (type
), DECL_SIZE (field
)))
4591 integer_type_kind itk
;
4593 bool was_unnamed_p
= false;
4594 /* We must allocate the bits as if suitably aligned for the
4595 longest integer type that fits in this many bits. type
4596 of the field. Then, we are supposed to use the left over
4597 bits as additional padding. */
4598 for (itk
= itk_char
; itk
!= itk_none
; ++itk
)
4599 if (INT_CST_LT (DECL_SIZE (field
),
4600 TYPE_SIZE (integer_types
[itk
])))
4603 /* ITK now indicates a type that is too large for the
4604 field. We have to back up by one to find the largest
4606 integer_type
= integer_types
[itk
- 1];
4608 /* Figure out how much additional padding is required. GCC
4609 3.2 always created a padding field, even if it had zero
4611 if (!abi_version_at_least (2)
4612 || INT_CST_LT (TYPE_SIZE (integer_type
), DECL_SIZE (field
)))
4614 if (abi_version_at_least (2) && TREE_CODE (t
) == UNION_TYPE
)
4615 /* In a union, the padding field must have the full width
4616 of the bit-field; all fields start at offset zero. */
4617 padding
= DECL_SIZE (field
);
4620 if (warn_abi
&& TREE_CODE (t
) == UNION_TYPE
)
4621 warning ("size assigned to %qT may not be "
4622 "ABI-compliant and may change in a future "
4625 padding
= size_binop (MINUS_EXPR
, DECL_SIZE (field
),
4626 TYPE_SIZE (integer_type
));
4629 #ifdef PCC_BITFIELD_TYPE_MATTERS
4630 /* An unnamed bitfield does not normally affect the
4631 alignment of the containing class on a target where
4632 PCC_BITFIELD_TYPE_MATTERS. But, the C++ ABI does not
4633 make any exceptions for unnamed bitfields when the
4634 bitfields are longer than their types. Therefore, we
4635 temporarily give the field a name. */
4636 if (PCC_BITFIELD_TYPE_MATTERS
&& !DECL_NAME (field
))
4638 was_unnamed_p
= true;
4639 DECL_NAME (field
) = make_anon_name ();
4642 DECL_SIZE (field
) = TYPE_SIZE (integer_type
);
4643 DECL_ALIGN (field
) = TYPE_ALIGN (integer_type
);
4644 DECL_USER_ALIGN (field
) = TYPE_USER_ALIGN (integer_type
);
4645 layout_nonempty_base_or_field (rli
, field
, NULL_TREE
,
4646 empty_base_offsets
);
4648 DECL_NAME (field
) = NULL_TREE
;
4649 /* Now that layout has been performed, set the size of the
4650 field to the size of its declared type; the rest of the
4651 field is effectively invisible. */
4652 DECL_SIZE (field
) = TYPE_SIZE (type
);
4653 /* We must also reset the DECL_MODE of the field. */
4654 if (abi_version_at_least (2))
4655 DECL_MODE (field
) = TYPE_MODE (type
);
4657 && DECL_MODE (field
) != TYPE_MODE (type
))
4658 /* Versions of G++ before G++ 3.4 did not reset the
4660 warning ("the offset of %qD may not be ABI-compliant and may "
4661 "change in a future version of GCC", field
);
4664 layout_nonempty_base_or_field (rli
, field
, NULL_TREE
,
4665 empty_base_offsets
);
4667 /* Remember the location of any empty classes in FIELD. */
4668 if (abi_version_at_least (2))
4669 record_subobject_offsets (TREE_TYPE (field
),
4670 byte_position(field
),
4674 /* If a bit-field does not immediately follow another bit-field,
4675 and yet it starts in the middle of a byte, we have failed to
4676 comply with the ABI. */
4678 && DECL_C_BIT_FIELD (field
)
4679 && !last_field_was_bitfield
4680 && !integer_zerop (size_binop (TRUNC_MOD_EXPR
,
4681 DECL_FIELD_BIT_OFFSET (field
),
4682 bitsize_unit_node
)))
4683 cp_warning_at ("offset of %qD is not ABI-compliant and may "
4684 "change in a future version of GCC",
4687 /* G++ used to use DECL_FIELD_OFFSET as if it were the byte
4688 offset of the field. */
4690 && !tree_int_cst_equal (DECL_FIELD_OFFSET (field
),
4691 byte_position (field
))
4692 && contains_empty_class_p (TREE_TYPE (field
)))
4693 cp_warning_at ("%qD contains empty classes which may cause base "
4694 "classes to be placed at different locations in a "
4695 "future version of GCC",
4698 /* If we needed additional padding after this field, add it
4704 padding_field
= build_decl (FIELD_DECL
,
4707 DECL_BIT_FIELD (padding_field
) = 1;
4708 DECL_SIZE (padding_field
) = padding
;
4709 DECL_CONTEXT (padding_field
) = t
;
4710 DECL_ARTIFICIAL (padding_field
) = 1;
4711 DECL_IGNORED_P (padding_field
) = 1;
4712 layout_nonempty_base_or_field (rli
, padding_field
,
4714 empty_base_offsets
);
4717 last_field_was_bitfield
= DECL_C_BIT_FIELD (field
);
4720 if (abi_version_at_least (2) && !integer_zerop (rli
->bitpos
))
4722 /* Make sure that we are on a byte boundary so that the size of
4723 the class without virtual bases will always be a round number
4725 rli
->bitpos
= round_up (rli
->bitpos
, BITS_PER_UNIT
);
4726 normalize_rli (rli
);
4729 /* G++ 3.2 does not allow virtual bases to be overlaid with tail
4731 if (!abi_version_at_least (2))
4732 include_empty_classes(rli
);
4734 /* Delete all zero-width bit-fields from the list of fields. Now
4735 that the type is laid out they are no longer important. */
4736 remove_zero_width_bit_fields (t
);
4738 /* Create the version of T used for virtual bases. We do not use
4739 make_aggr_type for this version; this is an artificial type. For
4740 a POD type, we just reuse T. */
4741 if (CLASSTYPE_NON_POD_P (t
) || CLASSTYPE_EMPTY_P (t
))
4743 base_t
= make_node (TREE_CODE (t
));
4745 /* Set the size and alignment for the new type. In G++ 3.2, all
4746 empty classes were considered to have size zero when used as
4748 if (!abi_version_at_least (2) && CLASSTYPE_EMPTY_P (t
))
4750 TYPE_SIZE (base_t
) = bitsize_zero_node
;
4751 TYPE_SIZE_UNIT (base_t
) = size_zero_node
;
4752 if (warn_abi
&& !integer_zerop (rli_size_unit_so_far (rli
)))
4753 warning ("layout of classes derived from empty class %qT "
4754 "may change in a future version of GCC",
4761 /* If the ABI version is not at least two, and the last
4762 field was a bit-field, RLI may not be on a byte
4763 boundary. In particular, rli_size_unit_so_far might
4764 indicate the last complete byte, while rli_size_so_far
4765 indicates the total number of bits used. Therefore,
4766 rli_size_so_far, rather than rli_size_unit_so_far, is
4767 used to compute TYPE_SIZE_UNIT. */
4768 eoc
= end_of_class (t
, /*include_virtuals_p=*/0);
4769 TYPE_SIZE_UNIT (base_t
)
4770 = size_binop (MAX_EXPR
,
4772 size_binop (CEIL_DIV_EXPR
,
4773 rli_size_so_far (rli
),
4774 bitsize_int (BITS_PER_UNIT
))),
4777 = size_binop (MAX_EXPR
,
4778 rli_size_so_far (rli
),
4779 size_binop (MULT_EXPR
,
4780 convert (bitsizetype
, eoc
),
4781 bitsize_int (BITS_PER_UNIT
)));
4783 TYPE_ALIGN (base_t
) = rli
->record_align
;
4784 TYPE_USER_ALIGN (base_t
) = TYPE_USER_ALIGN (t
);
4786 /* Copy the fields from T. */
4787 next_field
= &TYPE_FIELDS (base_t
);
4788 for (field
= TYPE_FIELDS (t
); field
; field
= TREE_CHAIN (field
))
4789 if (TREE_CODE (field
) == FIELD_DECL
)
4791 *next_field
= build_decl (FIELD_DECL
,
4794 DECL_CONTEXT (*next_field
) = base_t
;
4795 DECL_FIELD_OFFSET (*next_field
) = DECL_FIELD_OFFSET (field
);
4796 DECL_FIELD_BIT_OFFSET (*next_field
)
4797 = DECL_FIELD_BIT_OFFSET (field
);
4798 DECL_SIZE (*next_field
) = DECL_SIZE (field
);
4799 DECL_MODE (*next_field
) = DECL_MODE (field
);
4800 next_field
= &TREE_CHAIN (*next_field
);
4803 /* Record the base version of the type. */
4804 CLASSTYPE_AS_BASE (t
) = base_t
;
4805 TYPE_CONTEXT (base_t
) = t
;
4808 CLASSTYPE_AS_BASE (t
) = t
;
4810 /* Every empty class contains an empty class. */
4811 if (CLASSTYPE_EMPTY_P (t
))
4812 CLASSTYPE_CONTAINS_EMPTY_CLASS_P (t
) = 1;
4814 /* Set the TYPE_DECL for this type to contain the right
4815 value for DECL_OFFSET, so that we can use it as part
4816 of a COMPONENT_REF for multiple inheritance. */
4817 layout_decl (TYPE_MAIN_DECL (t
), 0);
4819 /* Now fix up any virtual base class types that we left lying
4820 around. We must get these done before we try to lay out the
4821 virtual function table. As a side-effect, this will remove the
4822 base subobject fields. */
4823 layout_virtual_bases (rli
, empty_base_offsets
);
4825 /* Make sure that empty classes are reflected in RLI at this
4827 include_empty_classes(rli
);
4829 /* Make sure not to create any structures with zero size. */
4830 if (integer_zerop (rli_size_unit_so_far (rli
)) && CLASSTYPE_EMPTY_P (t
))
4832 build_decl (FIELD_DECL
, NULL_TREE
, char_type_node
));
4834 /* Let the back-end lay out the type. */
4835 finish_record_layout (rli
, /*free_p=*/true);
4837 /* Warn about bases that can't be talked about due to ambiguity. */
4838 warn_about_ambiguous_bases (t
);
4840 /* Now that we're done with layout, give the base fields the real types. */
4841 for (field
= TYPE_FIELDS (t
); field
; field
= TREE_CHAIN (field
))
4842 if (DECL_ARTIFICIAL (field
) && IS_FAKE_BASE_TYPE (TREE_TYPE (field
)))
4843 TREE_TYPE (field
) = TYPE_CONTEXT (TREE_TYPE (field
));
4846 splay_tree_delete (empty_base_offsets
);
4849 /* Determine the "key method" for the class type indicated by TYPE,
4850 and set CLASSTYPE_KEY_METHOD accordingly. */
4853 determine_key_method (tree type
)
4857 if (TYPE_FOR_JAVA (type
)
4858 || processing_template_decl
4859 || CLASSTYPE_TEMPLATE_INSTANTIATION (type
)
4860 || CLASSTYPE_INTERFACE_KNOWN (type
))
4863 /* The key method is the first non-pure virtual function that is not
4864 inline at the point of class definition. On some targets the
4865 key function may not be inline; those targets should not call
4866 this function until the end of the translation unit. */
4867 for (method
= TYPE_METHODS (type
); method
!= NULL_TREE
;
4868 method
= TREE_CHAIN (method
))
4869 if (DECL_VINDEX (method
) != NULL_TREE
4870 && ! DECL_DECLARED_INLINE_P (method
)
4871 && ! DECL_PURE_VIRTUAL_P (method
))
4873 CLASSTYPE_KEY_METHOD (type
) = method
;
4880 /* Perform processing required when the definition of T (a class type)
4884 finish_struct_1 (tree t
)
4887 /* A TREE_LIST. The TREE_VALUE of each node is a FUNCTION_DECL. */
4888 tree virtuals
= NULL_TREE
;
4891 if (COMPLETE_TYPE_P (t
))
4893 gcc_assert (IS_AGGR_TYPE (t
));
4894 error ("redefinition of %q#T", t
);
4899 /* If this type was previously laid out as a forward reference,
4900 make sure we lay it out again. */
4901 TYPE_SIZE (t
) = NULL_TREE
;
4902 CLASSTYPE_PRIMARY_BINFO (t
) = NULL_TREE
;
4904 fixup_inline_methods (t
);
4906 /* Make assumptions about the class; we'll reset the flags if
4908 CLASSTYPE_EMPTY_P (t
) = 1;
4909 CLASSTYPE_NEARLY_EMPTY_P (t
) = 1;
4910 CLASSTYPE_CONTAINS_EMPTY_CLASS_P (t
) = 0;
4912 /* Do end-of-class semantic processing: checking the validity of the
4913 bases and members and add implicitly generated methods. */
4914 check_bases_and_members (t
);
4916 /* Find the key method. */
4917 if (TYPE_CONTAINS_VPTR_P (t
))
4919 /* The Itanium C++ ABI permits the key method to be chosen when
4920 the class is defined -- even though the key method so
4921 selected may later turn out to be an inline function. On
4922 some systems (such as ARM Symbian OS) the key method cannot
4923 be determined until the end of the translation unit. On such
4924 systems, we leave CLASSTYPE_KEY_METHOD set to NULL, which
4925 will cause the class to be added to KEYED_CLASSES. Then, in
4926 finish_file we will determine the key method. */
4927 if (targetm
.cxx
.key_method_may_be_inline ())
4928 determine_key_method (t
);
4930 /* If a polymorphic class has no key method, we may emit the vtable
4931 in every translation unit where the class definition appears. */
4932 if (CLASSTYPE_KEY_METHOD (t
) == NULL_TREE
)
4933 keyed_classes
= tree_cons (NULL_TREE
, t
, keyed_classes
);
4936 /* Layout the class itself. */
4937 layout_class_type (t
, &virtuals
);
4938 if (CLASSTYPE_AS_BASE (t
) != t
)
4939 /* We use the base type for trivial assignments, and hence it
4941 compute_record_mode (CLASSTYPE_AS_BASE (t
));
4943 virtuals
= modify_all_vtables (t
, nreverse (virtuals
));
4945 /* If necessary, create the primary vtable for this class. */
4946 if (virtuals
|| TYPE_CONTAINS_VPTR_P (t
))
4948 /* We must enter these virtuals into the table. */
4949 if (!CLASSTYPE_HAS_PRIMARY_BASE_P (t
))
4950 build_primary_vtable (NULL_TREE
, t
);
4951 else if (! BINFO_NEW_VTABLE_MARKED (TYPE_BINFO (t
)))
4952 /* Here we know enough to change the type of our virtual
4953 function table, but we will wait until later this function. */
4954 build_primary_vtable (CLASSTYPE_PRIMARY_BINFO (t
), t
);
4957 if (TYPE_CONTAINS_VPTR_P (t
))
4962 if (BINFO_VTABLE (TYPE_BINFO (t
)))
4963 gcc_assert (DECL_VIRTUAL_P (BINFO_VTABLE (TYPE_BINFO (t
))));
4964 if (!CLASSTYPE_HAS_PRIMARY_BASE_P (t
))
4965 gcc_assert (BINFO_VIRTUALS (TYPE_BINFO (t
)) == NULL_TREE
);
4967 /* Add entries for virtual functions introduced by this class. */
4968 BINFO_VIRTUALS (TYPE_BINFO (t
))
4969 = chainon (BINFO_VIRTUALS (TYPE_BINFO (t
)), virtuals
);
4971 /* Set DECL_VINDEX for all functions declared in this class. */
4972 for (vindex
= 0, fn
= BINFO_VIRTUALS (TYPE_BINFO (t
));
4974 fn
= TREE_CHAIN (fn
),
4975 vindex
+= (TARGET_VTABLE_USES_DESCRIPTORS
4976 ? TARGET_VTABLE_USES_DESCRIPTORS
: 1))
4978 tree fndecl
= BV_FN (fn
);
4980 if (DECL_THUNK_P (fndecl
))
4981 /* A thunk. We should never be calling this entry directly
4982 from this vtable -- we'd use the entry for the non
4983 thunk base function. */
4984 DECL_VINDEX (fndecl
) = NULL_TREE
;
4985 else if (TREE_CODE (DECL_VINDEX (fndecl
)) != INTEGER_CST
)
4986 DECL_VINDEX (fndecl
) = build_int_cst (NULL_TREE
, vindex
);
4990 finish_struct_bits (t
);
4992 /* Complete the rtl for any static member objects of the type we're
4994 for (x
= TYPE_FIELDS (t
); x
; x
= TREE_CHAIN (x
))
4995 if (TREE_CODE (x
) == VAR_DECL
&& TREE_STATIC (x
)
4996 && same_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (x
)), t
))
4997 DECL_MODE (x
) = TYPE_MODE (t
);
4999 /* Done with FIELDS...now decide whether to sort these for
5000 faster lookups later.
5002 We use a small number because most searches fail (succeeding
5003 ultimately as the search bores through the inheritance
5004 hierarchy), and we want this failure to occur quickly. */
5006 n_fields
= count_fields (TYPE_FIELDS (t
));
5009 struct sorted_fields_type
*field_vec
= GGC_NEWVAR
5010 (struct sorted_fields_type
,
5011 sizeof (struct sorted_fields_type
) + n_fields
* sizeof (tree
));
5012 field_vec
->len
= n_fields
;
5013 add_fields_to_record_type (TYPE_FIELDS (t
), field_vec
, 0);
5014 qsort (field_vec
->elts
, n_fields
, sizeof (tree
),
5016 if (! DECL_LANG_SPECIFIC (TYPE_MAIN_DECL (t
)))
5017 retrofit_lang_decl (TYPE_MAIN_DECL (t
));
5018 DECL_SORTED_FIELDS (TYPE_MAIN_DECL (t
)) = field_vec
;
5021 /* Make the rtl for any new vtables we have created, and unmark
5022 the base types we marked. */
5025 /* Build the VTT for T. */
5028 if (warn_nonvdtor
&& TYPE_POLYMORPHIC_P (t
))
5032 dtor
= CLASSTYPE_DESTRUCTORS (t
);
5033 /* Warn only if the dtor is non-private or the class has
5035 if (/* An implicitly declared destructor is always public. And,
5036 if it were virtual, we would have created it by now. */
5038 || (!DECL_VINDEX (dtor
)
5039 && (!TREE_PRIVATE (dtor
)
5040 || CLASSTYPE_FRIEND_CLASSES (t
)
5041 || DECL_FRIENDLIST (TYPE_MAIN_DECL (t
)))))
5042 warning ("%q#T has virtual functions but non-virtual destructor",
5048 if (warn_overloaded_virtual
)
5051 maybe_suppress_debug_info (t
);
5053 dump_class_hierarchy (t
);
5055 /* Finish debugging output for this type. */
5056 rest_of_type_compilation (t
, ! LOCAL_CLASS_P (t
));
5059 /* When T was built up, the member declarations were added in reverse
5060 order. Rearrange them to declaration order. */
5063 unreverse_member_declarations (tree t
)
5069 /* The following lists are all in reverse order. Put them in
5070 declaration order now. */
5071 TYPE_METHODS (t
) = nreverse (TYPE_METHODS (t
));
5072 CLASSTYPE_DECL_LIST (t
) = nreverse (CLASSTYPE_DECL_LIST (t
));
5074 /* Actually, for the TYPE_FIELDS, only the non TYPE_DECLs are in
5075 reverse order, so we can't just use nreverse. */
5077 for (x
= TYPE_FIELDS (t
);
5078 x
&& TREE_CODE (x
) != TYPE_DECL
;
5081 next
= TREE_CHAIN (x
);
5082 TREE_CHAIN (x
) = prev
;
5087 TREE_CHAIN (TYPE_FIELDS (t
)) = x
;
5089 TYPE_FIELDS (t
) = prev
;
5094 finish_struct (tree t
, tree attributes
)
5096 location_t saved_loc
= input_location
;
5098 /* Now that we've got all the field declarations, reverse everything
5100 unreverse_member_declarations (t
);
5102 cplus_decl_attributes (&t
, attributes
, (int) ATTR_FLAG_TYPE_IN_PLACE
);
5104 /* Nadger the current location so that diagnostics point to the start of
5105 the struct, not the end. */
5106 input_location
= DECL_SOURCE_LOCATION (TYPE_NAME (t
));
5108 if (processing_template_decl
)
5112 finish_struct_methods (t
);
5113 TYPE_SIZE (t
) = bitsize_zero_node
;
5115 /* We need to emit an error message if this type was used as a parameter
5116 and it is an abstract type, even if it is a template. We construct
5117 a simple CLASSTYPE_PURE_VIRTUALS list without taking bases into
5118 account and we call complete_vars with this type, which will check
5119 the PARM_DECLS. Note that while the type is being defined,
5120 CLASSTYPE_PURE_VIRTUALS contains the list of the inline friends
5121 (see CLASSTYPE_INLINE_FRIENDS) so we need to clear it. */
5122 CLASSTYPE_PURE_VIRTUALS (t
) = NULL
;
5123 for (x
= TYPE_METHODS (t
); x
; x
= TREE_CHAIN (x
))
5124 if (DECL_PURE_VIRTUAL_P (x
))
5125 VEC_safe_push (tree
, CLASSTYPE_PURE_VIRTUALS (t
), x
);
5129 finish_struct_1 (t
);
5131 input_location
= saved_loc
;
5133 TYPE_BEING_DEFINED (t
) = 0;
5135 if (current_class_type
)
5138 error ("trying to finish struct, but kicked out due to previous parse errors");
5140 if (processing_template_decl
&& at_function_scope_p ())
5141 add_stmt (build_min (TAG_DEFN
, t
));
5146 /* Return the dynamic type of INSTANCE, if known.
5147 Used to determine whether the virtual function table is needed
5150 *NONNULL is set iff INSTANCE can be known to be nonnull, regardless
5151 of our knowledge of its type. *NONNULL should be initialized
5152 before this function is called. */
5155 fixed_type_or_null (tree instance
, int* nonnull
, int* cdtorp
)
5157 switch (TREE_CODE (instance
))
5160 if (POINTER_TYPE_P (TREE_TYPE (instance
)))
5163 return fixed_type_or_null (TREE_OPERAND (instance
, 0),
5167 /* This is a call to a constructor, hence it's never zero. */
5168 if (TREE_HAS_CONSTRUCTOR (instance
))
5172 return TREE_TYPE (instance
);
5177 /* This is a call to a constructor, hence it's never zero. */
5178 if (TREE_HAS_CONSTRUCTOR (instance
))
5182 return TREE_TYPE (instance
);
5184 return fixed_type_or_null (TREE_OPERAND (instance
, 0), nonnull
, cdtorp
);
5188 if (TREE_CODE (TREE_OPERAND (instance
, 0)) == ADDR_EXPR
)
5189 return fixed_type_or_null (TREE_OPERAND (instance
, 0), nonnull
, cdtorp
);
5190 if (TREE_CODE (TREE_OPERAND (instance
, 1)) == INTEGER_CST
)
5191 /* Propagate nonnull. */
5192 return fixed_type_or_null (TREE_OPERAND (instance
, 0), nonnull
, cdtorp
);
5197 return fixed_type_or_null (TREE_OPERAND (instance
, 0), nonnull
, cdtorp
);
5200 instance
= TREE_OPERAND (instance
, 0);
5203 /* Just because we see an ADDR_EXPR doesn't mean we're dealing
5204 with a real object -- given &p->f, p can still be null. */
5205 tree t
= get_base_address (instance
);
5206 /* ??? Probably should check DECL_WEAK here. */
5207 if (t
&& DECL_P (t
))
5210 return fixed_type_or_null (instance
, nonnull
, cdtorp
);
5213 /* If this component is really a base class reference, then the field
5214 itself isn't definitive. */
5215 if (DECL_FIELD_IS_BASE (TREE_OPERAND (instance
, 1)))
5216 return fixed_type_or_null (TREE_OPERAND (instance
, 0), nonnull
, cdtorp
);
5217 return fixed_type_or_null (TREE_OPERAND (instance
, 1), nonnull
, cdtorp
);
5221 if (TREE_CODE (TREE_TYPE (instance
)) == ARRAY_TYPE
5222 && IS_AGGR_TYPE (TREE_TYPE (TREE_TYPE (instance
))))
5226 return TREE_TYPE (TREE_TYPE (instance
));
5228 /* fall through... */
5232 if (IS_AGGR_TYPE (TREE_TYPE (instance
)))
5236 return TREE_TYPE (instance
);
5238 else if (instance
== current_class_ptr
)
5243 /* if we're in a ctor or dtor, we know our type. */
5244 if (DECL_LANG_SPECIFIC (current_function_decl
)
5245 && (DECL_CONSTRUCTOR_P (current_function_decl
)
5246 || DECL_DESTRUCTOR_P (current_function_decl
)))
5250 return TREE_TYPE (TREE_TYPE (instance
));
5253 else if (TREE_CODE (TREE_TYPE (instance
)) == REFERENCE_TYPE
)
5255 /* Reference variables should be references to objects. */
5259 /* DECL_VAR_MARKED_P is used to prevent recursion; a
5260 variable's initializer may refer to the variable
5262 if (TREE_CODE (instance
) == VAR_DECL
5263 && DECL_INITIAL (instance
)
5264 && !DECL_VAR_MARKED_P (instance
))
5267 DECL_VAR_MARKED_P (instance
) = 1;
5268 type
= fixed_type_or_null (DECL_INITIAL (instance
),
5270 DECL_VAR_MARKED_P (instance
) = 0;
5281 /* Return nonzero if the dynamic type of INSTANCE is known, and
5282 equivalent to the static type. We also handle the case where
5283 INSTANCE is really a pointer. Return negative if this is a
5284 ctor/dtor. There the dynamic type is known, but this might not be
5285 the most derived base of the original object, and hence virtual
5286 bases may not be layed out according to this type.
5288 Used to determine whether the virtual function table is needed
5291 *NONNULL is set iff INSTANCE can be known to be nonnull, regardless
5292 of our knowledge of its type. *NONNULL should be initialized
5293 before this function is called. */
5296 resolves_to_fixed_type_p (tree instance
, int* nonnull
)
5298 tree t
= TREE_TYPE (instance
);
5301 tree fixed
= fixed_type_or_null (instance
, nonnull
, &cdtorp
);
5302 if (fixed
== NULL_TREE
)
5304 if (POINTER_TYPE_P (t
))
5306 if (!same_type_ignoring_top_level_qualifiers_p (t
, fixed
))
5308 return cdtorp
? -1 : 1;
5313 init_class_processing (void)
5315 current_class_depth
= 0;
5316 current_class_stack_size
= 10;
5318 = xmalloc (current_class_stack_size
* sizeof (struct class_stack_node
));
5319 VARRAY_TREE_INIT (local_classes
, 8, "local_classes");
5321 ridpointers
[(int) RID_PUBLIC
] = access_public_node
;
5322 ridpointers
[(int) RID_PRIVATE
] = access_private_node
;
5323 ridpointers
[(int) RID_PROTECTED
] = access_protected_node
;
5326 /* Restore the cached PREVIOUS_CLASS_LEVEL. */
5329 restore_class_cache (void)
5333 /* We are re-entering the same class we just left, so we don't
5334 have to search the whole inheritance matrix to find all the
5335 decls to bind again. Instead, we install the cached
5336 class_shadowed list and walk through it binding names. */
5337 push_binding_level (previous_class_level
);
5338 class_binding_level
= previous_class_level
;
5339 /* Restore IDENTIFIER_TYPE_VALUE. */
5340 for (type
= class_binding_level
->type_shadowed
;
5342 type
= TREE_CHAIN (type
))
5343 SET_IDENTIFIER_TYPE_VALUE (TREE_PURPOSE (type
), TREE_TYPE (type
));
5346 /* Set global variables CURRENT_CLASS_NAME and CURRENT_CLASS_TYPE as
5347 appropriate for TYPE.
5349 So that we may avoid calls to lookup_name, we cache the _TYPE
5350 nodes of local TYPE_DECLs in the TREE_TYPE field of the name.
5352 For multiple inheritance, we perform a two-pass depth-first search
5353 of the type lattice. */
5356 pushclass (tree type
)
5358 type
= TYPE_MAIN_VARIANT (type
);
5360 /* Make sure there is enough room for the new entry on the stack. */
5361 if (current_class_depth
+ 1 >= current_class_stack_size
)
5363 current_class_stack_size
*= 2;
5365 = xrealloc (current_class_stack
,
5366 current_class_stack_size
5367 * sizeof (struct class_stack_node
));
5370 /* Insert a new entry on the class stack. */
5371 current_class_stack
[current_class_depth
].name
= current_class_name
;
5372 current_class_stack
[current_class_depth
].type
= current_class_type
;
5373 current_class_stack
[current_class_depth
].access
= current_access_specifier
;
5374 current_class_stack
[current_class_depth
].names_used
= 0;
5375 current_class_depth
++;
5377 /* Now set up the new type. */
5378 current_class_name
= TYPE_NAME (type
);
5379 if (TREE_CODE (current_class_name
) == TYPE_DECL
)
5380 current_class_name
= DECL_NAME (current_class_name
);
5381 current_class_type
= type
;
5383 /* By default, things in classes are private, while things in
5384 structures or unions are public. */
5385 current_access_specifier
= (CLASSTYPE_DECLARED_CLASS (type
)
5386 ? access_private_node
5387 : access_public_node
);
5389 if (previous_class_level
5390 && type
!= previous_class_level
->this_entity
5391 && current_class_depth
== 1)
5393 /* Forcibly remove any old class remnants. */
5394 invalidate_class_lookup_cache ();
5397 if (!previous_class_level
5398 || type
!= previous_class_level
->this_entity
5399 || current_class_depth
> 1)
5402 restore_class_cache ();
5405 /* When we exit a toplevel class scope, we save its binding level so
5406 that we can restore it quickly. Here, we've entered some other
5407 class, so we must invalidate our cache. */
5410 invalidate_class_lookup_cache (void)
5412 previous_class_level
= NULL
;
5415 /* Get out of the current class scope. If we were in a class scope
5416 previously, that is the one popped to. */
5423 current_class_depth
--;
5424 current_class_name
= current_class_stack
[current_class_depth
].name
;
5425 current_class_type
= current_class_stack
[current_class_depth
].type
;
5426 current_access_specifier
= current_class_stack
[current_class_depth
].access
;
5427 if (current_class_stack
[current_class_depth
].names_used
)
5428 splay_tree_delete (current_class_stack
[current_class_depth
].names_used
);
5431 /* Returns 1 if current_class_type is either T or a nested type of T.
5432 We start looking from 1 because entry 0 is from global scope, and has
5436 currently_open_class (tree t
)
5439 if (current_class_type
&& same_type_p (t
, current_class_type
))
5441 for (i
= 1; i
< current_class_depth
; ++i
)
5442 if (current_class_stack
[i
].type
5443 && same_type_p (current_class_stack
[i
].type
, t
))
5448 /* If either current_class_type or one of its enclosing classes are derived
5449 from T, return the appropriate type. Used to determine how we found
5450 something via unqualified lookup. */
5453 currently_open_derived_class (tree t
)
5457 /* The bases of a dependent type are unknown. */
5458 if (dependent_type_p (t
))
5461 if (!current_class_type
)
5464 if (DERIVED_FROM_P (t
, current_class_type
))
5465 return current_class_type
;
5467 for (i
= current_class_depth
- 1; i
> 0; --i
)
5468 if (DERIVED_FROM_P (t
, current_class_stack
[i
].type
))
5469 return current_class_stack
[i
].type
;
5474 /* When entering a class scope, all enclosing class scopes' names with
5475 static meaning (static variables, static functions, types and
5476 enumerators) have to be visible. This recursive function calls
5477 pushclass for all enclosing class contexts until global or a local
5478 scope is reached. TYPE is the enclosed class. */
5481 push_nested_class (tree type
)
5485 /* A namespace might be passed in error cases, like A::B:C. */
5486 if (type
== NULL_TREE
5487 || type
== error_mark_node
5488 || TREE_CODE (type
) == NAMESPACE_DECL
5489 || ! IS_AGGR_TYPE (type
)
5490 || TREE_CODE (type
) == TEMPLATE_TYPE_PARM
5491 || TREE_CODE (type
) == BOUND_TEMPLATE_TEMPLATE_PARM
)
5494 context
= DECL_CONTEXT (TYPE_MAIN_DECL (type
));
5496 if (context
&& CLASS_TYPE_P (context
))
5497 push_nested_class (context
);
5501 /* Undoes a push_nested_class call. */
5504 pop_nested_class (void)
5506 tree context
= DECL_CONTEXT (TYPE_MAIN_DECL (current_class_type
));
5509 if (context
&& CLASS_TYPE_P (context
))
5510 pop_nested_class ();
5513 /* Returns the number of extern "LANG" blocks we are nested within. */
5516 current_lang_depth (void)
5518 return VARRAY_ACTIVE_SIZE (current_lang_base
);
5521 /* Set global variables CURRENT_LANG_NAME to appropriate value
5522 so that behavior of name-mangling machinery is correct. */
5525 push_lang_context (tree name
)
5527 VARRAY_PUSH_TREE (current_lang_base
, current_lang_name
);
5529 if (name
== lang_name_cplusplus
)
5531 current_lang_name
= name
;
5533 else if (name
== lang_name_java
)
5535 current_lang_name
= name
;
5536 /* DECL_IGNORED_P is initially set for these types, to avoid clutter.
5537 (See record_builtin_java_type in decl.c.) However, that causes
5538 incorrect debug entries if these types are actually used.
5539 So we re-enable debug output after extern "Java". */
5540 DECL_IGNORED_P (TYPE_NAME (java_byte_type_node
)) = 0;
5541 DECL_IGNORED_P (TYPE_NAME (java_short_type_node
)) = 0;
5542 DECL_IGNORED_P (TYPE_NAME (java_int_type_node
)) = 0;
5543 DECL_IGNORED_P (TYPE_NAME (java_long_type_node
)) = 0;
5544 DECL_IGNORED_P (TYPE_NAME (java_float_type_node
)) = 0;
5545 DECL_IGNORED_P (TYPE_NAME (java_double_type_node
)) = 0;
5546 DECL_IGNORED_P (TYPE_NAME (java_char_type_node
)) = 0;
5547 DECL_IGNORED_P (TYPE_NAME (java_boolean_type_node
)) = 0;
5549 else if (name
== lang_name_c
)
5551 current_lang_name
= name
;
5554 error ("language string %<\"%E\"%> not recognized", name
);
5557 /* Get out of the current language scope. */
5560 pop_lang_context (void)
5562 current_lang_name
= VARRAY_TOP_TREE (current_lang_base
);
5563 VARRAY_POP (current_lang_base
);
5566 /* Type instantiation routines. */
5568 /* Given an OVERLOAD and a TARGET_TYPE, return the function that
5569 matches the TARGET_TYPE. If there is no satisfactory match, return
5570 error_mark_node, and issue a error & warning messages under control
5571 of FLAGS. Permit pointers to member function if FLAGS permits. If
5572 TEMPLATE_ONLY, the name of the overloaded function was a
5573 template-id, and EXPLICIT_TARGS are the explicitly provided
5574 template arguments. */
5577 resolve_address_of_overloaded_function (tree target_type
,
5579 tsubst_flags_t flags
,
5581 tree explicit_targs
)
5583 /* Here's what the standard says:
5587 If the name is a function template, template argument deduction
5588 is done, and if the argument deduction succeeds, the deduced
5589 arguments are used to generate a single template function, which
5590 is added to the set of overloaded functions considered.
5592 Non-member functions and static member functions match targets of
5593 type "pointer-to-function" or "reference-to-function." Nonstatic
5594 member functions match targets of type "pointer-to-member
5595 function;" the function type of the pointer to member is used to
5596 select the member function from the set of overloaded member
5597 functions. If a nonstatic member function is selected, the
5598 reference to the overloaded function name is required to have the
5599 form of a pointer to member as described in 5.3.1.
5601 If more than one function is selected, any template functions in
5602 the set are eliminated if the set also contains a non-template
5603 function, and any given template function is eliminated if the
5604 set contains a second template function that is more specialized
5605 than the first according to the partial ordering rules 14.5.5.2.
5606 After such eliminations, if any, there shall remain exactly one
5607 selected function. */
5610 int is_reference
= 0;
5611 /* We store the matches in a TREE_LIST rooted here. The functions
5612 are the TREE_PURPOSE, not the TREE_VALUE, in this list, for easy
5613 interoperability with most_specialized_instantiation. */
5614 tree matches
= NULL_TREE
;
5617 /* By the time we get here, we should be seeing only real
5618 pointer-to-member types, not the internal POINTER_TYPE to
5619 METHOD_TYPE representation. */
5620 gcc_assert (TREE_CODE (target_type
) != POINTER_TYPE
5621 || TREE_CODE (TREE_TYPE (target_type
)) != METHOD_TYPE
);
5623 gcc_assert (is_overloaded_fn (overload
));
5625 /* Check that the TARGET_TYPE is reasonable. */
5626 if (TYPE_PTRFN_P (target_type
))
5628 else if (TYPE_PTRMEMFUNC_P (target_type
))
5629 /* This is OK, too. */
5631 else if (TREE_CODE (target_type
) == FUNCTION_TYPE
)
5633 /* This is OK, too. This comes from a conversion to reference
5635 target_type
= build_reference_type (target_type
);
5640 if (flags
& tf_error
)
5641 error ("cannot resolve overloaded function %qD based on"
5642 " conversion to type %qT",
5643 DECL_NAME (OVL_FUNCTION (overload
)), target_type
);
5644 return error_mark_node
;
5647 /* If we can find a non-template function that matches, we can just
5648 use it. There's no point in generating template instantiations
5649 if we're just going to throw them out anyhow. But, of course, we
5650 can only do this when we don't *need* a template function. */
5655 for (fns
= overload
; fns
; fns
= OVL_NEXT (fns
))
5657 tree fn
= OVL_CURRENT (fns
);
5660 if (TREE_CODE (fn
) == TEMPLATE_DECL
)
5661 /* We're not looking for templates just yet. */
5664 if ((TREE_CODE (TREE_TYPE (fn
)) == METHOD_TYPE
)
5666 /* We're looking for a non-static member, and this isn't
5667 one, or vice versa. */
5670 /* Ignore anticipated decls of undeclared builtins. */
5671 if (DECL_ANTICIPATED (fn
))
5674 /* See if there's a match. */
5675 fntype
= TREE_TYPE (fn
);
5677 fntype
= build_ptrmemfunc_type (build_pointer_type (fntype
));
5678 else if (!is_reference
)
5679 fntype
= build_pointer_type (fntype
);
5681 if (can_convert_arg (target_type
, fntype
, fn
))
5682 matches
= tree_cons (fn
, NULL_TREE
, matches
);
5686 /* Now, if we've already got a match (or matches), there's no need
5687 to proceed to the template functions. But, if we don't have a
5688 match we need to look at them, too. */
5691 tree target_fn_type
;
5692 tree target_arg_types
;
5693 tree target_ret_type
;
5698 = TREE_TYPE (TYPE_PTRMEMFUNC_FN_TYPE (target_type
));
5700 target_fn_type
= TREE_TYPE (target_type
);
5701 target_arg_types
= TYPE_ARG_TYPES (target_fn_type
);
5702 target_ret_type
= TREE_TYPE (target_fn_type
);
5704 /* Never do unification on the 'this' parameter. */
5705 if (TREE_CODE (target_fn_type
) == METHOD_TYPE
)
5706 target_arg_types
= TREE_CHAIN (target_arg_types
);
5708 for (fns
= overload
; fns
; fns
= OVL_NEXT (fns
))
5710 tree fn
= OVL_CURRENT (fns
);
5712 tree instantiation_type
;
5715 if (TREE_CODE (fn
) != TEMPLATE_DECL
)
5716 /* We're only looking for templates. */
5719 if ((TREE_CODE (TREE_TYPE (fn
)) == METHOD_TYPE
)
5721 /* We're not looking for a non-static member, and this is
5722 one, or vice versa. */
5725 /* Try to do argument deduction. */
5726 targs
= make_tree_vec (DECL_NTPARMS (fn
));
5727 if (fn_type_unification (fn
, explicit_targs
, targs
,
5728 target_arg_types
, target_ret_type
,
5729 DEDUCE_EXACT
, -1) != 0)
5730 /* Argument deduction failed. */
5733 /* Instantiate the template. */
5734 instantiation
= instantiate_template (fn
, targs
, flags
);
5735 if (instantiation
== error_mark_node
)
5736 /* Instantiation failed. */
5739 /* See if there's a match. */
5740 instantiation_type
= TREE_TYPE (instantiation
);
5742 instantiation_type
=
5743 build_ptrmemfunc_type (build_pointer_type (instantiation_type
));
5744 else if (!is_reference
)
5745 instantiation_type
= build_pointer_type (instantiation_type
);
5746 if (can_convert_arg (target_type
, instantiation_type
, instantiation
))
5747 matches
= tree_cons (instantiation
, fn
, matches
);
5750 /* Now, remove all but the most specialized of the matches. */
5753 tree match
= most_specialized_instantiation (matches
);
5755 if (match
!= error_mark_node
)
5756 matches
= tree_cons (match
, NULL_TREE
, NULL_TREE
);
5760 /* Now we should have exactly one function in MATCHES. */
5761 if (matches
== NULL_TREE
)
5763 /* There were *no* matches. */
5764 if (flags
& tf_error
)
5766 error ("no matches converting function %qD to type %q#T",
5767 DECL_NAME (OVL_FUNCTION (overload
)),
5770 /* print_candidates expects a chain with the functions in
5771 TREE_VALUE slots, so we cons one up here (we're losing anyway,
5772 so why be clever?). */
5773 for (; overload
; overload
= OVL_NEXT (overload
))
5774 matches
= tree_cons (NULL_TREE
, OVL_CURRENT (overload
),
5777 print_candidates (matches
);
5779 return error_mark_node
;
5781 else if (TREE_CHAIN (matches
))
5783 /* There were too many matches. */
5785 if (flags
& tf_error
)
5789 error ("converting overloaded function %qD to type %q#T is ambiguous",
5790 DECL_NAME (OVL_FUNCTION (overload
)),
5793 /* Since print_candidates expects the functions in the
5794 TREE_VALUE slot, we flip them here. */
5795 for (match
= matches
; match
; match
= TREE_CHAIN (match
))
5796 TREE_VALUE (match
) = TREE_PURPOSE (match
);
5798 print_candidates (matches
);
5801 return error_mark_node
;
5804 /* Good, exactly one match. Now, convert it to the correct type. */
5805 fn
= TREE_PURPOSE (matches
);
5807 if (DECL_NONSTATIC_MEMBER_FUNCTION_P (fn
)
5808 && !(flags
& tf_ptrmem_ok
) && !flag_ms_extensions
)
5810 static int explained
;
5812 if (!(flags
& tf_error
))
5813 return error_mark_node
;
5815 pedwarn ("assuming pointer to member %qD", fn
);
5818 pedwarn ("(a pointer to member can only be formed with %<&%E%>)", fn
);
5823 /* If we're doing overload resolution purely for the purpose of
5824 determining conversion sequences, we should not consider the
5825 function used. If this conversion sequence is selected, the
5826 function will be marked as used at this point. */
5827 if (!(flags
& tf_conv
))
5830 if (TYPE_PTRFN_P (target_type
) || TYPE_PTRMEMFUNC_P (target_type
))
5831 return build_unary_op (ADDR_EXPR
, fn
, 0);
5834 /* The target must be a REFERENCE_TYPE. Above, build_unary_op
5835 will mark the function as addressed, but here we must do it
5837 cxx_mark_addressable (fn
);
5843 /* This function will instantiate the type of the expression given in
5844 RHS to match the type of LHSTYPE. If errors exist, then return
5845 error_mark_node. FLAGS is a bit mask. If TF_ERROR is set, then
5846 we complain on errors. If we are not complaining, never modify rhs,
5847 as overload resolution wants to try many possible instantiations, in
5848 the hope that at least one will work.
5850 For non-recursive calls, LHSTYPE should be a function, pointer to
5851 function, or a pointer to member function. */
5854 instantiate_type (tree lhstype
, tree rhs
, tsubst_flags_t flags
)
5856 tsubst_flags_t flags_in
= flags
;
5858 flags
&= ~tf_ptrmem_ok
;
5860 if (TREE_CODE (lhstype
) == UNKNOWN_TYPE
)
5862 if (flags
& tf_error
)
5863 error ("not enough type information");
5864 return error_mark_node
;
5867 if (TREE_TYPE (rhs
) != NULL_TREE
&& ! (type_unknown_p (rhs
)))
5869 if (same_type_p (lhstype
, TREE_TYPE (rhs
)))
5871 if (flag_ms_extensions
5872 && TYPE_PTRMEMFUNC_P (lhstype
)
5873 && !TYPE_PTRMEMFUNC_P (TREE_TYPE (rhs
)))
5874 /* Microsoft allows `A::f' to be resolved to a
5875 pointer-to-member. */
5879 if (flags
& tf_error
)
5880 error ("argument of type %qT does not match %qT",
5881 TREE_TYPE (rhs
), lhstype
);
5882 return error_mark_node
;
5886 if (TREE_CODE (rhs
) == BASELINK
)
5887 rhs
= BASELINK_FUNCTIONS (rhs
);
5889 /* If we are in a template, and have a NON_DEPENDENT_EXPR, we cannot
5890 deduce any type information. */
5891 if (TREE_CODE (rhs
) == NON_DEPENDENT_EXPR
)
5893 if (flags
& tf_error
)
5894 error ("not enough type information");
5895 return error_mark_node
;
5898 /* We don't overwrite rhs if it is an overloaded function.
5899 Copying it would destroy the tree link. */
5900 if (TREE_CODE (rhs
) != OVERLOAD
)
5901 rhs
= copy_node (rhs
);
5903 /* This should really only be used when attempting to distinguish
5904 what sort of a pointer to function we have. For now, any
5905 arithmetic operation which is not supported on pointers
5906 is rejected as an error. */
5908 switch (TREE_CODE (rhs
))
5921 new_rhs
= instantiate_type (build_pointer_type (lhstype
),
5922 TREE_OPERAND (rhs
, 0), flags
);
5923 if (new_rhs
== error_mark_node
)
5924 return error_mark_node
;
5926 TREE_TYPE (rhs
) = lhstype
;
5927 TREE_OPERAND (rhs
, 0) = new_rhs
;
5932 rhs
= copy_node (TREE_OPERAND (rhs
, 0));
5933 TREE_TYPE (rhs
) = unknown_type_node
;
5934 return instantiate_type (lhstype
, rhs
, flags
);
5938 tree member
= TREE_OPERAND (rhs
, 1);
5940 member
= instantiate_type (lhstype
, member
, flags
);
5941 if (member
!= error_mark_node
5942 && TREE_SIDE_EFFECTS (TREE_OPERAND (rhs
, 0)))
5943 /* Do not lose object's side effects. */
5944 return build2 (COMPOUND_EXPR
, TREE_TYPE (member
),
5945 TREE_OPERAND (rhs
, 0), member
);
5950 rhs
= TREE_OPERAND (rhs
, 1);
5951 if (BASELINK_P (rhs
))
5952 return instantiate_type (lhstype
, BASELINK_FUNCTIONS (rhs
), flags_in
);
5954 /* This can happen if we are forming a pointer-to-member for a
5956 gcc_assert (TREE_CODE (rhs
) == TEMPLATE_ID_EXPR
);
5960 case TEMPLATE_ID_EXPR
:
5962 tree fns
= TREE_OPERAND (rhs
, 0);
5963 tree args
= TREE_OPERAND (rhs
, 1);
5966 resolve_address_of_overloaded_function (lhstype
, fns
, flags_in
,
5967 /*template_only=*/true,
5974 resolve_address_of_overloaded_function (lhstype
, rhs
, flags_in
,
5975 /*template_only=*/false,
5976 /*explicit_targs=*/NULL_TREE
);
5979 /* This is too hard for now. */
5985 TREE_OPERAND (rhs
, 0)
5986 = instantiate_type (lhstype
, TREE_OPERAND (rhs
, 0), flags
);
5987 if (TREE_OPERAND (rhs
, 0) == error_mark_node
)
5988 return error_mark_node
;
5989 TREE_OPERAND (rhs
, 1)
5990 = instantiate_type (lhstype
, TREE_OPERAND (rhs
, 1), flags
);
5991 if (TREE_OPERAND (rhs
, 1) == error_mark_node
)
5992 return error_mark_node
;
5994 TREE_TYPE (rhs
) = lhstype
;
5998 case TRUNC_DIV_EXPR
:
5999 case FLOOR_DIV_EXPR
:
6001 case ROUND_DIV_EXPR
:
6003 case TRUNC_MOD_EXPR
:
6004 case FLOOR_MOD_EXPR
:
6006 case ROUND_MOD_EXPR
:
6007 case FIX_ROUND_EXPR
:
6008 case FIX_FLOOR_EXPR
:
6010 case FIX_TRUNC_EXPR
:
6025 case PREINCREMENT_EXPR
:
6026 case PREDECREMENT_EXPR
:
6027 case POSTINCREMENT_EXPR
:
6028 case POSTDECREMENT_EXPR
:
6029 if (flags
& tf_error
)
6030 error ("invalid operation on uninstantiated type");
6031 return error_mark_node
;
6033 case TRUTH_AND_EXPR
:
6035 case TRUTH_XOR_EXPR
:
6042 case TRUTH_ANDIF_EXPR
:
6043 case TRUTH_ORIF_EXPR
:
6044 case TRUTH_NOT_EXPR
:
6045 if (flags
& tf_error
)
6046 error ("not enough type information");
6047 return error_mark_node
;
6050 if (type_unknown_p (TREE_OPERAND (rhs
, 0)))
6052 if (flags
& tf_error
)
6053 error ("not enough type information");
6054 return error_mark_node
;
6056 TREE_OPERAND (rhs
, 1)
6057 = instantiate_type (lhstype
, TREE_OPERAND (rhs
, 1), flags
);
6058 if (TREE_OPERAND (rhs
, 1) == error_mark_node
)
6059 return error_mark_node
;
6060 TREE_OPERAND (rhs
, 2)
6061 = instantiate_type (lhstype
, TREE_OPERAND (rhs
, 2), flags
);
6062 if (TREE_OPERAND (rhs
, 2) == error_mark_node
)
6063 return error_mark_node
;
6065 TREE_TYPE (rhs
) = lhstype
;
6069 TREE_OPERAND (rhs
, 1)
6070 = instantiate_type (lhstype
, TREE_OPERAND (rhs
, 1), flags
);
6071 if (TREE_OPERAND (rhs
, 1) == error_mark_node
)
6072 return error_mark_node
;
6074 TREE_TYPE (rhs
) = lhstype
;
6079 if (PTRMEM_OK_P (rhs
))
6080 flags
|= tf_ptrmem_ok
;
6082 return instantiate_type (lhstype
, TREE_OPERAND (rhs
, 0), flags
);
6086 return error_mark_node
;
6091 return error_mark_node
;
6094 /* Return the name of the virtual function pointer field
6095 (as an IDENTIFIER_NODE) for the given TYPE. Note that
6096 this may have to look back through base types to find the
6097 ultimate field name. (For single inheritance, these could
6098 all be the same name. Who knows for multiple inheritance). */
6101 get_vfield_name (tree type
)
6103 tree binfo
, base_binfo
;
6106 for (binfo
= TYPE_BINFO (type
);
6107 BINFO_N_BASE_BINFOS (binfo
);
6110 base_binfo
= BINFO_BASE_BINFO (binfo
, 0);
6112 if (BINFO_VIRTUAL_P (base_binfo
)
6113 || !TYPE_CONTAINS_VPTR_P (BINFO_TYPE (base_binfo
)))
6117 type
= BINFO_TYPE (binfo
);
6118 buf
= alloca (sizeof (VFIELD_NAME_FORMAT
) + TYPE_NAME_LENGTH (type
) + 2);
6119 sprintf (buf
, VFIELD_NAME_FORMAT
,
6120 IDENTIFIER_POINTER (constructor_name (type
)));
6121 return get_identifier (buf
);
6125 print_class_statistics (void)
6127 #ifdef GATHER_STATISTICS
6128 fprintf (stderr
, "convert_harshness = %d\n", n_convert_harshness
);
6129 fprintf (stderr
, "compute_conversion_costs = %d\n", n_compute_conversion_costs
);
6132 fprintf (stderr
, "vtables = %d; vtable searches = %d\n",
6133 n_vtables
, n_vtable_searches
);
6134 fprintf (stderr
, "vtable entries = %d; vtable elems = %d\n",
6135 n_vtable_entries
, n_vtable_elems
);
6140 /* Build a dummy reference to ourselves so Derived::Base (and A::A) works,
6141 according to [class]:
6142 The class-name is also inserted
6143 into the scope of the class itself. For purposes of access checking,
6144 the inserted class name is treated as if it were a public member name. */
6147 build_self_reference (void)
6149 tree name
= constructor_name (current_class_type
);
6150 tree value
= build_lang_decl (TYPE_DECL
, name
, current_class_type
);
6153 DECL_NONLOCAL (value
) = 1;
6154 DECL_CONTEXT (value
) = current_class_type
;
6155 DECL_ARTIFICIAL (value
) = 1;
6156 SET_DECL_SELF_REFERENCE_P (value
);
6158 if (processing_template_decl
)
6159 value
= push_template_decl (value
);
6161 saved_cas
= current_access_specifier
;
6162 current_access_specifier
= access_public_node
;
6163 finish_member_declaration (value
);
6164 current_access_specifier
= saved_cas
;
6167 /* Returns 1 if TYPE contains only padding bytes. */
6170 is_empty_class (tree type
)
6172 if (type
== error_mark_node
)
6175 if (! IS_AGGR_TYPE (type
))
6178 /* In G++ 3.2, whether or not a class was empty was determined by
6179 looking at its size. */
6180 if (abi_version_at_least (2))
6181 return CLASSTYPE_EMPTY_P (type
);
6183 return integer_zerop (CLASSTYPE_SIZE (type
));
6186 /* Returns true if TYPE contains an empty class. */
6189 contains_empty_class_p (tree type
)
6191 if (is_empty_class (type
))
6193 if (CLASS_TYPE_P (type
))
6200 for (binfo
= TYPE_BINFO (type
), i
= 0;
6201 BINFO_BASE_ITERATE (binfo
, i
, base_binfo
); ++i
)
6202 if (contains_empty_class_p (BINFO_TYPE (base_binfo
)))
6204 for (field
= TYPE_FIELDS (type
); field
; field
= TREE_CHAIN (field
))
6205 if (TREE_CODE (field
) == FIELD_DECL
6206 && !DECL_ARTIFICIAL (field
)
6207 && is_empty_class (TREE_TYPE (field
)))
6210 else if (TREE_CODE (type
) == ARRAY_TYPE
)
6211 return contains_empty_class_p (TREE_TYPE (type
));
6215 /* Note that NAME was looked up while the current class was being
6216 defined and that the result of that lookup was DECL. */
6219 maybe_note_name_used_in_class (tree name
, tree decl
)
6221 splay_tree names_used
;
6223 /* If we're not defining a class, there's nothing to do. */
6224 if (!(innermost_scope_kind() == sk_class
6225 && TYPE_BEING_DEFINED (current_class_type
)))
6228 /* If there's already a binding for this NAME, then we don't have
6229 anything to worry about. */
6230 if (lookup_member (current_class_type
, name
,
6231 /*protect=*/0, /*want_type=*/false))
6234 if (!current_class_stack
[current_class_depth
- 1].names_used
)
6235 current_class_stack
[current_class_depth
- 1].names_used
6236 = splay_tree_new (splay_tree_compare_pointers
, 0, 0);
6237 names_used
= current_class_stack
[current_class_depth
- 1].names_used
;
6239 splay_tree_insert (names_used
,
6240 (splay_tree_key
) name
,
6241 (splay_tree_value
) decl
);
6244 /* Note that NAME was declared (as DECL) in the current class. Check
6245 to see that the declaration is valid. */
6248 note_name_declared_in_class (tree name
, tree decl
)
6250 splay_tree names_used
;
6253 /* Look to see if we ever used this name. */
6255 = current_class_stack
[current_class_depth
- 1].names_used
;
6259 n
= splay_tree_lookup (names_used
, (splay_tree_key
) name
);
6262 /* [basic.scope.class]
6264 A name N used in a class S shall refer to the same declaration
6265 in its context and when re-evaluated in the completed scope of
6267 error ("declaration of %q#D", decl
);
6268 cp_error_at ("changes meaning of %qD from %q+#D",
6269 DECL_NAME (OVL_CURRENT (decl
)),
6274 /* Returns the VAR_DECL for the complete vtable associated with BINFO.
6275 Secondary vtables are merged with primary vtables; this function
6276 will return the VAR_DECL for the primary vtable. */
6279 get_vtbl_decl_for_binfo (tree binfo
)
6283 decl
= BINFO_VTABLE (binfo
);
6284 if (decl
&& TREE_CODE (decl
) == PLUS_EXPR
)
6286 gcc_assert (TREE_CODE (TREE_OPERAND (decl
, 0)) == ADDR_EXPR
);
6287 decl
= TREE_OPERAND (TREE_OPERAND (decl
, 0), 0);
6290 gcc_assert (TREE_CODE (decl
) == VAR_DECL
);
6295 /* Returns the binfo for the primary base of BINFO. If the resulting
6296 BINFO is a virtual base, and it is inherited elsewhere in the
6297 hierarchy, then the returned binfo might not be the primary base of
6298 BINFO in the complete object. Check BINFO_PRIMARY_P or
6299 BINFO_LOST_PRIMARY_P to be sure. */
6302 get_primary_binfo (tree binfo
)
6307 primary_base
= CLASSTYPE_PRIMARY_BINFO (BINFO_TYPE (binfo
));
6311 result
= copied_binfo (primary_base
, binfo
);
6315 /* If INDENTED_P is zero, indent to INDENT. Return nonzero. */
6318 maybe_indent_hierarchy (FILE * stream
, int indent
, int indented_p
)
6321 fprintf (stream
, "%*s", indent
, "");
6325 /* Dump the offsets of all the bases rooted at BINFO to STREAM.
6326 INDENT should be zero when called from the top level; it is
6327 incremented recursively. IGO indicates the next expected BINFO in
6328 inheritance graph ordering. */
6331 dump_class_hierarchy_r (FILE *stream
,
6341 indented
= maybe_indent_hierarchy (stream
, indent
, 0);
6342 fprintf (stream
, "%s (0x%lx) ",
6343 type_as_string (BINFO_TYPE (binfo
), TFF_PLAIN_IDENTIFIER
),
6344 (unsigned long) binfo
);
6347 fprintf (stream
, "alternative-path\n");
6350 igo
= TREE_CHAIN (binfo
);
6352 fprintf (stream
, HOST_WIDE_INT_PRINT_DEC
,
6353 tree_low_cst (BINFO_OFFSET (binfo
), 0));
6354 if (is_empty_class (BINFO_TYPE (binfo
)))
6355 fprintf (stream
, " empty");
6356 else if (CLASSTYPE_NEARLY_EMPTY_P (BINFO_TYPE (binfo
)))
6357 fprintf (stream
, " nearly-empty");
6358 if (BINFO_VIRTUAL_P (binfo
))
6359 fprintf (stream
, " virtual");
6360 fprintf (stream
, "\n");
6363 if (BINFO_PRIMARY_P (binfo
))
6365 indented
= maybe_indent_hierarchy (stream
, indent
+ 3, indented
);
6366 fprintf (stream
, " primary-for %s (0x%lx)",
6367 type_as_string (BINFO_TYPE (BINFO_INHERITANCE_CHAIN (binfo
)),
6368 TFF_PLAIN_IDENTIFIER
),
6369 (unsigned long)BINFO_INHERITANCE_CHAIN (binfo
));
6371 if (BINFO_LOST_PRIMARY_P (binfo
))
6373 indented
= maybe_indent_hierarchy (stream
, indent
+ 3, indented
);
6374 fprintf (stream
, " lost-primary");
6377 fprintf (stream
, "\n");
6379 if (!(flags
& TDF_SLIM
))
6383 if (BINFO_SUBVTT_INDEX (binfo
))
6385 indented
= maybe_indent_hierarchy (stream
, indent
+ 3, indented
);
6386 fprintf (stream
, " subvttidx=%s",
6387 expr_as_string (BINFO_SUBVTT_INDEX (binfo
),
6388 TFF_PLAIN_IDENTIFIER
));
6390 if (BINFO_VPTR_INDEX (binfo
))
6392 indented
= maybe_indent_hierarchy (stream
, indent
+ 3, indented
);
6393 fprintf (stream
, " vptridx=%s",
6394 expr_as_string (BINFO_VPTR_INDEX (binfo
),
6395 TFF_PLAIN_IDENTIFIER
));
6397 if (BINFO_VPTR_FIELD (binfo
))
6399 indented
= maybe_indent_hierarchy (stream
, indent
+ 3, indented
);
6400 fprintf (stream
, " vbaseoffset=%s",
6401 expr_as_string (BINFO_VPTR_FIELD (binfo
),
6402 TFF_PLAIN_IDENTIFIER
));
6404 if (BINFO_VTABLE (binfo
))
6406 indented
= maybe_indent_hierarchy (stream
, indent
+ 3, indented
);
6407 fprintf (stream
, " vptr=%s",
6408 expr_as_string (BINFO_VTABLE (binfo
),
6409 TFF_PLAIN_IDENTIFIER
));
6413 fprintf (stream
, "\n");
6416 for (i
= 0; BINFO_BASE_ITERATE (binfo
, i
, base_binfo
); i
++)
6417 igo
= dump_class_hierarchy_r (stream
, flags
, base_binfo
, igo
, indent
+ 2);
6422 /* Dump the BINFO hierarchy for T. */
6425 dump_class_hierarchy_1 (FILE *stream
, int flags
, tree t
)
6427 fprintf (stream
, "Class %s\n", type_as_string (t
, TFF_PLAIN_IDENTIFIER
));
6428 fprintf (stream
, " size=%lu align=%lu\n",
6429 (unsigned long)(tree_low_cst (TYPE_SIZE (t
), 0) / BITS_PER_UNIT
),
6430 (unsigned long)(TYPE_ALIGN (t
) / BITS_PER_UNIT
));
6431 fprintf (stream
, " base size=%lu base align=%lu\n",
6432 (unsigned long)(tree_low_cst (TYPE_SIZE (CLASSTYPE_AS_BASE (t
)), 0)
6434 (unsigned long)(TYPE_ALIGN (CLASSTYPE_AS_BASE (t
))
6436 dump_class_hierarchy_r (stream
, flags
, TYPE_BINFO (t
), TYPE_BINFO (t
), 0);
6437 fprintf (stream
, "\n");
6440 /* Debug interface to hierarchy dumping. */
6443 debug_class (tree t
)
6445 dump_class_hierarchy_1 (stderr
, TDF_SLIM
, t
);
6449 dump_class_hierarchy (tree t
)
6452 FILE *stream
= dump_begin (TDI_class
, &flags
);
6456 dump_class_hierarchy_1 (stream
, flags
, t
);
6457 dump_end (TDI_class
, stream
);
6462 dump_array (FILE * stream
, tree decl
)
6467 tree size
= TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (decl
)));
6469 elt
= (tree_low_cst (TYPE_SIZE (TREE_TYPE (TREE_TYPE (decl
))), 0)
6471 fprintf (stream
, "%s:", decl_as_string (decl
, TFF_PLAIN_IDENTIFIER
));
6472 fprintf (stream
, " %s entries",
6473 expr_as_string (size_binop (PLUS_EXPR
, size
, size_one_node
),
6474 TFF_PLAIN_IDENTIFIER
));
6475 fprintf (stream
, "\n");
6477 for (ix
= 0, inits
= CONSTRUCTOR_ELTS (DECL_INITIAL (decl
));
6478 inits
; ix
++, inits
= TREE_CHAIN (inits
))
6479 fprintf (stream
, "%-4ld %s\n", (long)(ix
* elt
),
6480 expr_as_string (TREE_VALUE (inits
), TFF_PLAIN_IDENTIFIER
));
6484 dump_vtable (tree t
, tree binfo
, tree vtable
)
6487 FILE *stream
= dump_begin (TDI_class
, &flags
);
6492 if (!(flags
& TDF_SLIM
))
6494 int ctor_vtbl_p
= TYPE_BINFO (t
) != binfo
;
6496 fprintf (stream
, "%s for %s",
6497 ctor_vtbl_p
? "Construction vtable" : "Vtable",
6498 type_as_string (BINFO_TYPE (binfo
), TFF_PLAIN_IDENTIFIER
));
6501 if (!BINFO_VIRTUAL_P (binfo
))
6502 fprintf (stream
, " (0x%lx instance)", (unsigned long)binfo
);
6503 fprintf (stream
, " in %s", type_as_string (t
, TFF_PLAIN_IDENTIFIER
));
6505 fprintf (stream
, "\n");
6506 dump_array (stream
, vtable
);
6507 fprintf (stream
, "\n");
6510 dump_end (TDI_class
, stream
);
6514 dump_vtt (tree t
, tree vtt
)
6517 FILE *stream
= dump_begin (TDI_class
, &flags
);
6522 if (!(flags
& TDF_SLIM
))
6524 fprintf (stream
, "VTT for %s\n",
6525 type_as_string (t
, TFF_PLAIN_IDENTIFIER
));
6526 dump_array (stream
, vtt
);
6527 fprintf (stream
, "\n");
6530 dump_end (TDI_class
, stream
);
6533 /* Dump a function or thunk and its thunkees. */
6536 dump_thunk (FILE *stream
, int indent
, tree thunk
)
6538 static const char spaces
[] = " ";
6539 tree name
= DECL_NAME (thunk
);
6542 fprintf (stream
, "%.*s%p %s %s", indent
, spaces
,
6544 !DECL_THUNK_P (thunk
) ? "function"
6545 : DECL_THIS_THUNK_P (thunk
) ? "this-thunk" : "covariant-thunk",
6546 name
? IDENTIFIER_POINTER (name
) : "<unset>");
6547 if (DECL_THUNK_P (thunk
))
6549 HOST_WIDE_INT fixed_adjust
= THUNK_FIXED_OFFSET (thunk
);
6550 tree virtual_adjust
= THUNK_VIRTUAL_OFFSET (thunk
);
6552 fprintf (stream
, " fixed=" HOST_WIDE_INT_PRINT_DEC
, fixed_adjust
);
6553 if (!virtual_adjust
)
6555 else if (DECL_THIS_THUNK_P (thunk
))
6556 fprintf (stream
, " vcall=" HOST_WIDE_INT_PRINT_DEC
,
6557 tree_low_cst (virtual_adjust
, 0));
6559 fprintf (stream
, " vbase=" HOST_WIDE_INT_PRINT_DEC
"(%s)",
6560 tree_low_cst (BINFO_VPTR_FIELD (virtual_adjust
), 0),
6561 type_as_string (BINFO_TYPE (virtual_adjust
), TFF_SCOPE
));
6562 if (THUNK_ALIAS (thunk
))
6563 fprintf (stream
, " alias to %p", (void *)THUNK_ALIAS (thunk
));
6565 fprintf (stream
, "\n");
6566 for (thunks
= DECL_THUNKS (thunk
); thunks
; thunks
= TREE_CHAIN (thunks
))
6567 dump_thunk (stream
, indent
+ 2, thunks
);
6570 /* Dump the thunks for FN. */
6573 debug_thunks (tree fn
)
6575 dump_thunk (stderr
, 0, fn
);
6578 /* Virtual function table initialization. */
6580 /* Create all the necessary vtables for T and its base classes. */
6583 finish_vtbls (tree t
)
6588 /* We lay out the primary and secondary vtables in one contiguous
6589 vtable. The primary vtable is first, followed by the non-virtual
6590 secondary vtables in inheritance graph order. */
6591 list
= build_tree_list (BINFO_VTABLE (TYPE_BINFO (t
)), NULL_TREE
);
6592 accumulate_vtbl_inits (TYPE_BINFO (t
), TYPE_BINFO (t
),
6593 TYPE_BINFO (t
), t
, list
);
6595 /* Then come the virtual bases, also in inheritance graph order. */
6596 for (vbase
= TYPE_BINFO (t
); vbase
; vbase
= TREE_CHAIN (vbase
))
6598 if (!BINFO_VIRTUAL_P (vbase
))
6600 accumulate_vtbl_inits (vbase
, vbase
, TYPE_BINFO (t
), t
, list
);
6603 if (BINFO_VTABLE (TYPE_BINFO (t
)))
6604 initialize_vtable (TYPE_BINFO (t
), TREE_VALUE (list
));
6607 /* Initialize the vtable for BINFO with the INITS. */
6610 initialize_vtable (tree binfo
, tree inits
)
6614 layout_vtable_decl (binfo
, list_length (inits
));
6615 decl
= get_vtbl_decl_for_binfo (binfo
);
6616 initialize_artificial_var (decl
, inits
);
6617 dump_vtable (BINFO_TYPE (binfo
), binfo
, decl
);
6620 /* Build the VTT (virtual table table) for T.
6621 A class requires a VTT if it has virtual bases.
6624 1 - primary virtual pointer for complete object T
6625 2 - secondary VTTs for each direct non-virtual base of T which requires a
6627 3 - secondary virtual pointers for each direct or indirect base of T which
6628 has virtual bases or is reachable via a virtual path from T.
6629 4 - secondary VTTs for each direct or indirect virtual base of T.
6631 Secondary VTTs look like complete object VTTs without part 4. */
6641 /* Build up the initializers for the VTT. */
6643 index
= size_zero_node
;
6644 build_vtt_inits (TYPE_BINFO (t
), t
, &inits
, &index
);
6646 /* If we didn't need a VTT, we're done. */
6650 /* Figure out the type of the VTT. */
6651 type
= build_index_type (size_int (list_length (inits
) - 1));
6652 type
= build_cplus_array_type (const_ptr_type_node
, type
);
6654 /* Now, build the VTT object itself. */
6655 vtt
= build_vtable (t
, get_vtt_name (t
), type
);
6656 initialize_artificial_var (vtt
, inits
);
6657 /* Add the VTT to the vtables list. */
6658 TREE_CHAIN (vtt
) = TREE_CHAIN (CLASSTYPE_VTABLES (t
));
6659 TREE_CHAIN (CLASSTYPE_VTABLES (t
)) = vtt
;
6664 /* When building a secondary VTT, BINFO_VTABLE is set to a TREE_LIST with
6665 PURPOSE the RTTI_BINFO, VALUE the real vtable pointer for this binfo,
6666 and CHAIN the vtable pointer for this binfo after construction is
6667 complete. VALUE can also be another BINFO, in which case we recurse. */
6670 binfo_ctor_vtable (tree binfo
)
6676 vt
= BINFO_VTABLE (binfo
);
6677 if (TREE_CODE (vt
) == TREE_LIST
)
6678 vt
= TREE_VALUE (vt
);
6679 if (TREE_CODE (vt
) == TREE_BINFO
)
6688 /* Data for secondary VTT initialization. */
6689 typedef struct secondary_vptr_vtt_init_data_s
6691 /* Is this the primary VTT? */
6694 /* Current index into the VTT. */
6697 /* TREE_LIST of initializers built up. */
6700 /* The type being constructed by this secondary VTT. */
6701 tree type_being_constructed
;
6702 } secondary_vptr_vtt_init_data
;
6704 /* Recursively build the VTT-initializer for BINFO (which is in the
6705 hierarchy dominated by T). INITS points to the end of the initializer
6706 list to date. INDEX is the VTT index where the next element will be
6707 replaced. Iff BINFO is the binfo for T, this is the top level VTT (i.e.
6708 not a subvtt for some base of T). When that is so, we emit the sub-VTTs
6709 for virtual bases of T. When it is not so, we build the constructor
6710 vtables for the BINFO-in-T variant. */
6713 build_vtt_inits (tree binfo
, tree t
, tree
*inits
, tree
*index
)
6718 tree secondary_vptrs
;
6719 secondary_vptr_vtt_init_data data
;
6720 int top_level_p
= SAME_BINFO_TYPE_P (BINFO_TYPE (binfo
), t
);
6722 /* We only need VTTs for subobjects with virtual bases. */
6723 if (!CLASSTYPE_VBASECLASSES (BINFO_TYPE (binfo
)))
6726 /* We need to use a construction vtable if this is not the primary
6730 build_ctor_vtbl_group (binfo
, t
);
6732 /* Record the offset in the VTT where this sub-VTT can be found. */
6733 BINFO_SUBVTT_INDEX (binfo
) = *index
;
6736 /* Add the address of the primary vtable for the complete object. */
6737 init
= binfo_ctor_vtable (binfo
);
6738 *inits
= build_tree_list (NULL_TREE
, init
);
6739 inits
= &TREE_CHAIN (*inits
);
6742 gcc_assert (!BINFO_VPTR_INDEX (binfo
));
6743 BINFO_VPTR_INDEX (binfo
) = *index
;
6745 *index
= size_binop (PLUS_EXPR
, *index
, TYPE_SIZE_UNIT (ptr_type_node
));
6747 /* Recursively add the secondary VTTs for non-virtual bases. */
6748 for (i
= 0; BINFO_BASE_ITERATE (binfo
, i
, b
); ++i
)
6749 if (!BINFO_VIRTUAL_P (b
))
6750 inits
= build_vtt_inits (b
, t
, inits
, index
);
6752 /* Add secondary virtual pointers for all subobjects of BINFO with
6753 either virtual bases or reachable along a virtual path, except
6754 subobjects that are non-virtual primary bases. */
6755 data
.top_level_p
= top_level_p
;
6756 data
.index
= *index
;
6758 data
.type_being_constructed
= BINFO_TYPE (binfo
);
6760 dfs_walk_once (binfo
, dfs_build_secondary_vptr_vtt_inits
, NULL
, &data
);
6762 *index
= data
.index
;
6764 /* The secondary vptrs come back in reverse order. After we reverse
6765 them, and add the INITS, the last init will be the first element
6767 secondary_vptrs
= data
.inits
;
6768 if (secondary_vptrs
)
6770 *inits
= nreverse (secondary_vptrs
);
6771 inits
= &TREE_CHAIN (secondary_vptrs
);
6772 gcc_assert (*inits
== NULL_TREE
);
6776 /* Add the secondary VTTs for virtual bases in inheritance graph
6778 for (b
= TYPE_BINFO (BINFO_TYPE (binfo
)); b
; b
= TREE_CHAIN (b
))
6780 if (!BINFO_VIRTUAL_P (b
))
6783 inits
= build_vtt_inits (b
, t
, inits
, index
);
6786 /* Remove the ctor vtables we created. */
6787 dfs_walk_all (binfo
, dfs_fixup_binfo_vtbls
, NULL
, binfo
);
6792 /* Called from build_vtt_inits via dfs_walk. BINFO is the binfo for the base
6793 in most derived. DATA is a SECONDARY_VPTR_VTT_INIT_DATA structure. */
6796 dfs_build_secondary_vptr_vtt_inits (tree binfo
, void *data_
)
6798 secondary_vptr_vtt_init_data
*data
= (secondary_vptr_vtt_init_data
*)data_
;
6800 /* We don't care about bases that don't have vtables. */
6801 if (!TYPE_VFIELD (BINFO_TYPE (binfo
)))
6802 return dfs_skip_bases
;
6804 /* We're only interested in proper subobjects of the type being
6806 if (SAME_BINFO_TYPE_P (BINFO_TYPE (binfo
), data
->type_being_constructed
))
6809 /* We're only interested in bases with virtual bases or reachable
6810 via a virtual path from the type being constructed. */
6811 if (!(CLASSTYPE_VBASECLASSES (BINFO_TYPE (binfo
))
6812 || binfo_via_virtual (binfo
, data
->type_being_constructed
)))
6813 return dfs_skip_bases
;
6815 /* We're not interested in non-virtual primary bases. */
6816 if (!BINFO_VIRTUAL_P (binfo
) && BINFO_PRIMARY_P (binfo
))
6819 /* Record the index where this secondary vptr can be found. */
6820 if (data
->top_level_p
)
6822 gcc_assert (!BINFO_VPTR_INDEX (binfo
));
6823 BINFO_VPTR_INDEX (binfo
) = data
->index
;
6825 if (BINFO_VIRTUAL_P (binfo
))
6827 /* It's a primary virtual base, and this is not a
6828 construction vtable. Find the base this is primary of in
6829 the inheritance graph, and use that base's vtable
6831 while (BINFO_PRIMARY_P (binfo
))
6832 binfo
= BINFO_INHERITANCE_CHAIN (binfo
);
6836 /* Add the initializer for the secondary vptr itself. */
6837 data
->inits
= tree_cons (NULL_TREE
, binfo_ctor_vtable (binfo
), data
->inits
);
6839 /* Advance the vtt index. */
6840 data
->index
= size_binop (PLUS_EXPR
, data
->index
,
6841 TYPE_SIZE_UNIT (ptr_type_node
));
6846 /* Called from build_vtt_inits via dfs_walk. After building
6847 constructor vtables and generating the sub-vtt from them, we need
6848 to restore the BINFO_VTABLES that were scribbled on. DATA is the
6849 binfo of the base whose sub vtt was generated. */
6852 dfs_fixup_binfo_vtbls (tree binfo
, void* data
)
6854 tree vtable
= BINFO_VTABLE (binfo
);
6856 if (!TYPE_CONTAINS_VPTR_P (BINFO_TYPE (binfo
)))
6857 /* If this class has no vtable, none of its bases do. */
6858 return dfs_skip_bases
;
6861 /* This might be a primary base, so have no vtable in this
6865 /* If we scribbled the construction vtable vptr into BINFO, clear it
6867 if (TREE_CODE (vtable
) == TREE_LIST
6868 && (TREE_PURPOSE (vtable
) == (tree
) data
))
6869 BINFO_VTABLE (binfo
) = TREE_CHAIN (vtable
);
6874 /* Build the construction vtable group for BINFO which is in the
6875 hierarchy dominated by T. */
6878 build_ctor_vtbl_group (tree binfo
, tree t
)
6887 /* See if we've already created this construction vtable group. */
6888 id
= mangle_ctor_vtbl_for_type (t
, binfo
);
6889 if (IDENTIFIER_GLOBAL_VALUE (id
))
6892 gcc_assert (!SAME_BINFO_TYPE_P (BINFO_TYPE (binfo
), t
));
6893 /* Build a version of VTBL (with the wrong type) for use in
6894 constructing the addresses of secondary vtables in the
6895 construction vtable group. */
6896 vtbl
= build_vtable (t
, id
, ptr_type_node
);
6897 DECL_CONSTRUCTION_VTABLE_P (vtbl
) = 1;
6898 list
= build_tree_list (vtbl
, NULL_TREE
);
6899 accumulate_vtbl_inits (binfo
, TYPE_BINFO (TREE_TYPE (binfo
)),
6902 /* Add the vtables for each of our virtual bases using the vbase in T
6904 for (vbase
= TYPE_BINFO (BINFO_TYPE (binfo
));
6906 vbase
= TREE_CHAIN (vbase
))
6910 if (!BINFO_VIRTUAL_P (vbase
))
6912 b
= copied_binfo (vbase
, binfo
);
6914 accumulate_vtbl_inits (b
, vbase
, binfo
, t
, list
);
6916 inits
= TREE_VALUE (list
);
6918 /* Figure out the type of the construction vtable. */
6919 type
= build_index_type (size_int (list_length (inits
) - 1));
6920 type
= build_cplus_array_type (vtable_entry_type
, type
);
6921 TREE_TYPE (vtbl
) = type
;
6923 /* Initialize the construction vtable. */
6924 CLASSTYPE_VTABLES (t
) = chainon (CLASSTYPE_VTABLES (t
), vtbl
);
6925 initialize_artificial_var (vtbl
, inits
);
6926 dump_vtable (t
, binfo
, vtbl
);
6929 /* Add the vtbl initializers for BINFO (and its bases other than
6930 non-virtual primaries) to the list of INITS. BINFO is in the
6931 hierarchy dominated by T. RTTI_BINFO is the binfo within T of
6932 the constructor the vtbl inits should be accumulated for. (If this
6933 is the complete object vtbl then RTTI_BINFO will be TYPE_BINFO (T).)
6934 ORIG_BINFO is the binfo for this object within BINFO_TYPE (RTTI_BINFO).
6935 BINFO is the active base equivalent of ORIG_BINFO in the inheritance
6936 graph of T. Both BINFO and ORIG_BINFO will have the same BINFO_TYPE,
6937 but are not necessarily the same in terms of layout. */
6940 accumulate_vtbl_inits (tree binfo
,
6948 int ctor_vtbl_p
= !SAME_BINFO_TYPE_P (BINFO_TYPE (rtti_binfo
), t
);
6950 gcc_assert (SAME_BINFO_TYPE_P (BINFO_TYPE (binfo
), BINFO_TYPE (orig_binfo
)));
6952 /* If it doesn't have a vptr, we don't do anything. */
6953 if (!TYPE_CONTAINS_VPTR_P (BINFO_TYPE (binfo
)))
6956 /* If we're building a construction vtable, we're not interested in
6957 subobjects that don't require construction vtables. */
6959 && !CLASSTYPE_VBASECLASSES (BINFO_TYPE (binfo
))
6960 && !binfo_via_virtual (orig_binfo
, BINFO_TYPE (rtti_binfo
)))
6963 /* Build the initializers for the BINFO-in-T vtable. */
6965 = chainon (TREE_VALUE (inits
),
6966 dfs_accumulate_vtbl_inits (binfo
, orig_binfo
,
6967 rtti_binfo
, t
, inits
));
6969 /* Walk the BINFO and its bases. We walk in preorder so that as we
6970 initialize each vtable we can figure out at what offset the
6971 secondary vtable lies from the primary vtable. We can't use
6972 dfs_walk here because we need to iterate through bases of BINFO
6973 and RTTI_BINFO simultaneously. */
6974 for (i
= 0; BINFO_BASE_ITERATE (binfo
, i
, base_binfo
); ++i
)
6976 /* Skip virtual bases. */
6977 if (BINFO_VIRTUAL_P (base_binfo
))
6979 accumulate_vtbl_inits (base_binfo
,
6980 BINFO_BASE_BINFO (orig_binfo
, i
),
6986 /* Called from accumulate_vtbl_inits. Returns the initializers for
6987 the BINFO vtable. */
6990 dfs_accumulate_vtbl_inits (tree binfo
,
6996 tree inits
= NULL_TREE
;
6997 tree vtbl
= NULL_TREE
;
6998 int ctor_vtbl_p
= !SAME_BINFO_TYPE_P (BINFO_TYPE (rtti_binfo
), t
);
7001 && BINFO_VIRTUAL_P (orig_binfo
) && BINFO_PRIMARY_P (orig_binfo
))
7003 /* In the hierarchy of BINFO_TYPE (RTTI_BINFO), this is a
7004 primary virtual base. If it is not the same primary in
7005 the hierarchy of T, we'll need to generate a ctor vtable
7006 for it, to place at its location in T. If it is the same
7007 primary, we still need a VTT entry for the vtable, but it
7008 should point to the ctor vtable for the base it is a
7009 primary for within the sub-hierarchy of RTTI_BINFO.
7011 There are three possible cases:
7013 1) We are in the same place.
7014 2) We are a primary base within a lost primary virtual base of
7016 3) We are primary to something not a base of RTTI_BINFO. */
7019 tree last
= NULL_TREE
;
7021 /* First, look through the bases we are primary to for RTTI_BINFO
7022 or a virtual base. */
7024 while (BINFO_PRIMARY_P (b
))
7026 b
= BINFO_INHERITANCE_CHAIN (b
);
7028 if (BINFO_VIRTUAL_P (b
) || b
== rtti_binfo
)
7031 /* If we run out of primary links, keep looking down our
7032 inheritance chain; we might be an indirect primary. */
7033 for (b
= last
; b
; b
= BINFO_INHERITANCE_CHAIN (b
))
7034 if (BINFO_VIRTUAL_P (b
) || b
== rtti_binfo
)
7038 /* If we found RTTI_BINFO, this is case 1. If we found a virtual
7039 base B and it is a base of RTTI_BINFO, this is case 2. In
7040 either case, we share our vtable with LAST, i.e. the
7041 derived-most base within B of which we are a primary. */
7043 || (b
&& binfo_for_vbase (BINFO_TYPE (b
), BINFO_TYPE (rtti_binfo
))))
7044 /* Just set our BINFO_VTABLE to point to LAST, as we may not have
7045 set LAST's BINFO_VTABLE yet. We'll extract the actual vptr in
7046 binfo_ctor_vtable after everything's been set up. */
7049 /* Otherwise, this is case 3 and we get our own. */
7051 else if (!BINFO_NEW_VTABLE_MARKED (orig_binfo
))
7059 /* Compute the initializer for this vtable. */
7060 inits
= build_vtbl_initializer (binfo
, orig_binfo
, t
, rtti_binfo
,
7063 /* Figure out the position to which the VPTR should point. */
7064 vtbl
= TREE_PURPOSE (l
);
7065 vtbl
= build1 (ADDR_EXPR
, vtbl_ptr_type_node
, vtbl
);
7066 index
= size_binop (PLUS_EXPR
,
7067 size_int (non_fn_entries
),
7068 size_int (list_length (TREE_VALUE (l
))));
7069 index
= size_binop (MULT_EXPR
,
7070 TYPE_SIZE_UNIT (vtable_entry_type
),
7072 vtbl
= build2 (PLUS_EXPR
, TREE_TYPE (vtbl
), vtbl
, index
);
7076 /* For a construction vtable, we can't overwrite BINFO_VTABLE.
7077 So, we make a TREE_LIST. Later, dfs_fixup_binfo_vtbls will
7078 straighten this out. */
7079 BINFO_VTABLE (binfo
) = tree_cons (rtti_binfo
, vtbl
, BINFO_VTABLE (binfo
));
7080 else if (BINFO_PRIMARY_P (binfo
) && BINFO_VIRTUAL_P (binfo
))
7083 /* For an ordinary vtable, set BINFO_VTABLE. */
7084 BINFO_VTABLE (binfo
) = vtbl
;
7089 static GTY(()) tree abort_fndecl_addr
;
7091 /* Construct the initializer for BINFO's virtual function table. BINFO
7092 is part of the hierarchy dominated by T. If we're building a
7093 construction vtable, the ORIG_BINFO is the binfo we should use to
7094 find the actual function pointers to put in the vtable - but they
7095 can be overridden on the path to most-derived in the graph that
7096 ORIG_BINFO belongs. Otherwise,
7097 ORIG_BINFO should be the same as BINFO. The RTTI_BINFO is the
7098 BINFO that should be indicated by the RTTI information in the
7099 vtable; it will be a base class of T, rather than T itself, if we
7100 are building a construction vtable.
7102 The value returned is a TREE_LIST suitable for wrapping in a
7103 CONSTRUCTOR to use as the DECL_INITIAL for a vtable. If
7104 NON_FN_ENTRIES_P is not NULL, *NON_FN_ENTRIES_P is set to the
7105 number of non-function entries in the vtable.
7107 It might seem that this function should never be called with a
7108 BINFO for which BINFO_PRIMARY_P holds, the vtable for such a
7109 base is always subsumed by a derived class vtable. However, when
7110 we are building construction vtables, we do build vtables for
7111 primary bases; we need these while the primary base is being
7115 build_vtbl_initializer (tree binfo
,
7119 int* non_fn_entries_p
)
7128 /* Initialize VID. */
7129 memset (&vid
, 0, sizeof (vid
));
7132 vid
.rtti_binfo
= rtti_binfo
;
7133 vid
.last_init
= &vid
.inits
;
7134 vid
.primary_vtbl_p
= SAME_BINFO_TYPE_P (BINFO_TYPE (binfo
), t
);
7135 vid
.ctor_vtbl_p
= !SAME_BINFO_TYPE_P (BINFO_TYPE (rtti_binfo
), t
);
7136 vid
.generate_vcall_entries
= true;
7137 /* The first vbase or vcall offset is at index -3 in the vtable. */
7138 vid
.index
= ssize_int(-3 * TARGET_VTABLE_DATA_ENTRY_DISTANCE
);
7140 /* Add entries to the vtable for RTTI. */
7141 build_rtti_vtbl_entries (binfo
, &vid
);
7143 /* Create an array for keeping track of the functions we've
7144 processed. When we see multiple functions with the same
7145 signature, we share the vcall offsets. */
7146 VARRAY_TREE_INIT (vid
.fns
, 32, "fns");
7147 /* Add the vcall and vbase offset entries. */
7148 build_vcall_and_vbase_vtbl_entries (binfo
, &vid
);
7150 /* Clear BINFO_VTABLE_PATH_MARKED; it's set by
7151 build_vbase_offset_vtbl_entries. */
7152 for (vbases
= CLASSTYPE_VBASECLASSES (t
), ix
= 0;
7153 VEC_iterate (tree
, vbases
, ix
, vbinfo
); ix
++)
7154 BINFO_VTABLE_PATH_MARKED (vbinfo
) = 0;
7156 /* If the target requires padding between data entries, add that now. */
7157 if (TARGET_VTABLE_DATA_ENTRY_DISTANCE
> 1)
7161 for (prev
= &vid
.inits
; (cur
= *prev
); prev
= &TREE_CHAIN (cur
))
7166 for (i
= 1; i
< TARGET_VTABLE_DATA_ENTRY_DISTANCE
; ++i
)
7167 add
= tree_cons (NULL_TREE
,
7168 build1 (NOP_EXPR
, vtable_entry_type
,
7175 if (non_fn_entries_p
)
7176 *non_fn_entries_p
= list_length (vid
.inits
);
7178 /* Go through all the ordinary virtual functions, building up
7180 vfun_inits
= NULL_TREE
;
7181 for (v
= BINFO_VIRTUALS (orig_binfo
); v
; v
= TREE_CHAIN (v
))
7185 tree fn
, fn_original
;
7186 tree init
= NULL_TREE
;
7190 if (DECL_THUNK_P (fn
))
7192 if (!DECL_NAME (fn
))
7194 if (THUNK_ALIAS (fn
))
7196 fn
= THUNK_ALIAS (fn
);
7199 fn_original
= THUNK_TARGET (fn
);
7202 /* If the only definition of this function signature along our
7203 primary base chain is from a lost primary, this vtable slot will
7204 never be used, so just zero it out. This is important to avoid
7205 requiring extra thunks which cannot be generated with the function.
7207 We first check this in update_vtable_entry_for_fn, so we handle
7208 restored primary bases properly; we also need to do it here so we
7209 zero out unused slots in ctor vtables, rather than filling themff
7210 with erroneous values (though harmless, apart from relocation
7212 for (b
= binfo
; ; b
= get_primary_binfo (b
))
7214 /* We found a defn before a lost primary; go ahead as normal. */
7215 if (look_for_overrides_here (BINFO_TYPE (b
), fn_original
))
7218 /* The nearest definition is from a lost primary; clear the
7220 if (BINFO_LOST_PRIMARY_P (b
))
7222 init
= size_zero_node
;
7229 /* Pull the offset for `this', and the function to call, out of
7231 delta
= BV_DELTA (v
);
7232 vcall_index
= BV_VCALL_INDEX (v
);
7234 gcc_assert (TREE_CODE (delta
) == INTEGER_CST
);
7235 gcc_assert (TREE_CODE (fn
) == FUNCTION_DECL
);
7237 /* You can't call an abstract virtual function; it's abstract.
7238 So, we replace these functions with __pure_virtual. */
7239 if (DECL_PURE_VIRTUAL_P (fn_original
))
7242 if (abort_fndecl_addr
== NULL
)
7243 abort_fndecl_addr
= build1 (ADDR_EXPR
, vfunc_ptr_type_node
, fn
);
7244 init
= abort_fndecl_addr
;
7248 if (!integer_zerop (delta
) || vcall_index
)
7250 fn
= make_thunk (fn
, /*this_adjusting=*/1, delta
, vcall_index
);
7251 if (!DECL_NAME (fn
))
7254 /* Take the address of the function, considering it to be of an
7255 appropriate generic type. */
7256 init
= build1 (ADDR_EXPR
, vfunc_ptr_type_node
, fn
);
7260 /* And add it to the chain of initializers. */
7261 if (TARGET_VTABLE_USES_DESCRIPTORS
)
7264 if (init
== size_zero_node
)
7265 for (i
= 0; i
< TARGET_VTABLE_USES_DESCRIPTORS
; ++i
)
7266 vfun_inits
= tree_cons (NULL_TREE
, init
, vfun_inits
);
7268 for (i
= 0; i
< TARGET_VTABLE_USES_DESCRIPTORS
; ++i
)
7270 tree fdesc
= build2 (FDESC_EXPR
, vfunc_ptr_type_node
,
7271 TREE_OPERAND (init
, 0),
7272 build_int_cst (NULL_TREE
, i
));
7273 TREE_CONSTANT (fdesc
) = 1;
7274 TREE_INVARIANT (fdesc
) = 1;
7276 vfun_inits
= tree_cons (NULL_TREE
, fdesc
, vfun_inits
);
7280 vfun_inits
= tree_cons (NULL_TREE
, init
, vfun_inits
);
7283 /* The initializers for virtual functions were built up in reverse
7284 order; straighten them out now. */
7285 vfun_inits
= nreverse (vfun_inits
);
7287 /* The negative offset initializers are also in reverse order. */
7288 vid
.inits
= nreverse (vid
.inits
);
7290 /* Chain the two together. */
7291 return chainon (vid
.inits
, vfun_inits
);
7294 /* Adds to vid->inits the initializers for the vbase and vcall
7295 offsets in BINFO, which is in the hierarchy dominated by T. */
7298 build_vcall_and_vbase_vtbl_entries (tree binfo
, vtbl_init_data
* vid
)
7302 /* If this is a derived class, we must first create entries
7303 corresponding to the primary base class. */
7304 b
= get_primary_binfo (binfo
);
7306 build_vcall_and_vbase_vtbl_entries (b
, vid
);
7308 /* Add the vbase entries for this base. */
7309 build_vbase_offset_vtbl_entries (binfo
, vid
);
7310 /* Add the vcall entries for this base. */
7311 build_vcall_offset_vtbl_entries (binfo
, vid
);
7314 /* Returns the initializers for the vbase offset entries in the vtable
7315 for BINFO (which is part of the class hierarchy dominated by T), in
7316 reverse order. VBASE_OFFSET_INDEX gives the vtable index
7317 where the next vbase offset will go. */
7320 build_vbase_offset_vtbl_entries (tree binfo
, vtbl_init_data
* vid
)
7324 tree non_primary_binfo
;
7326 /* If there are no virtual baseclasses, then there is nothing to
7328 if (!CLASSTYPE_VBASECLASSES (BINFO_TYPE (binfo
)))
7333 /* We might be a primary base class. Go up the inheritance hierarchy
7334 until we find the most derived class of which we are a primary base:
7335 it is the offset of that which we need to use. */
7336 non_primary_binfo
= binfo
;
7337 while (BINFO_INHERITANCE_CHAIN (non_primary_binfo
))
7341 /* If we have reached a virtual base, then it must be a primary
7342 base (possibly multi-level) of vid->binfo, or we wouldn't
7343 have called build_vcall_and_vbase_vtbl_entries for it. But it
7344 might be a lost primary, so just skip down to vid->binfo. */
7345 if (BINFO_VIRTUAL_P (non_primary_binfo
))
7347 non_primary_binfo
= vid
->binfo
;
7351 b
= BINFO_INHERITANCE_CHAIN (non_primary_binfo
);
7352 if (get_primary_binfo (b
) != non_primary_binfo
)
7354 non_primary_binfo
= b
;
7357 /* Go through the virtual bases, adding the offsets. */
7358 for (vbase
= TYPE_BINFO (BINFO_TYPE (binfo
));
7360 vbase
= TREE_CHAIN (vbase
))
7365 if (!BINFO_VIRTUAL_P (vbase
))
7368 /* Find the instance of this virtual base in the complete
7370 b
= copied_binfo (vbase
, binfo
);
7372 /* If we've already got an offset for this virtual base, we
7373 don't need another one. */
7374 if (BINFO_VTABLE_PATH_MARKED (b
))
7376 BINFO_VTABLE_PATH_MARKED (b
) = 1;
7378 /* Figure out where we can find this vbase offset. */
7379 delta
= size_binop (MULT_EXPR
,
7382 TYPE_SIZE_UNIT (vtable_entry_type
)));
7383 if (vid
->primary_vtbl_p
)
7384 BINFO_VPTR_FIELD (b
) = delta
;
7386 if (binfo
!= TYPE_BINFO (t
))
7387 /* The vbase offset had better be the same. */
7388 gcc_assert (tree_int_cst_equal (delta
, BINFO_VPTR_FIELD (vbase
)));
7390 /* The next vbase will come at a more negative offset. */
7391 vid
->index
= size_binop (MINUS_EXPR
, vid
->index
,
7392 ssize_int (TARGET_VTABLE_DATA_ENTRY_DISTANCE
));
7394 /* The initializer is the delta from BINFO to this virtual base.
7395 The vbase offsets go in reverse inheritance-graph order, and
7396 we are walking in inheritance graph order so these end up in
7398 delta
= size_diffop (BINFO_OFFSET (b
), BINFO_OFFSET (non_primary_binfo
));
7401 = build_tree_list (NULL_TREE
,
7402 fold (build1 (NOP_EXPR
,
7405 vid
->last_init
= &TREE_CHAIN (*vid
->last_init
);
7409 /* Adds the initializers for the vcall offset entries in the vtable
7410 for BINFO (which is part of the class hierarchy dominated by VID->DERIVED)
7414 build_vcall_offset_vtbl_entries (tree binfo
, vtbl_init_data
* vid
)
7416 /* We only need these entries if this base is a virtual base. We
7417 compute the indices -- but do not add to the vtable -- when
7418 building the main vtable for a class. */
7419 if (BINFO_VIRTUAL_P (binfo
) || binfo
== TYPE_BINFO (vid
->derived
))
7421 /* We need a vcall offset for each of the virtual functions in this
7422 vtable. For example:
7424 class A { virtual void f (); };
7425 class B1 : virtual public A { virtual void f (); };
7426 class B2 : virtual public A { virtual void f (); };
7427 class C: public B1, public B2 { virtual void f (); };
7429 A C object has a primary base of B1, which has a primary base of A. A
7430 C also has a secondary base of B2, which no longer has a primary base
7431 of A. So the B2-in-C construction vtable needs a secondary vtable for
7432 A, which will adjust the A* to a B2* to call f. We have no way of
7433 knowing what (or even whether) this offset will be when we define B2,
7434 so we store this "vcall offset" in the A sub-vtable and look it up in
7435 a "virtual thunk" for B2::f.
7437 We need entries for all the functions in our primary vtable and
7438 in our non-virtual bases' secondary vtables. */
7440 /* If we are just computing the vcall indices -- but do not need
7441 the actual entries -- not that. */
7442 if (!BINFO_VIRTUAL_P (binfo
))
7443 vid
->generate_vcall_entries
= false;
7444 /* Now, walk through the non-virtual bases, adding vcall offsets. */
7445 add_vcall_offset_vtbl_entries_r (binfo
, vid
);
7449 /* Build vcall offsets, starting with those for BINFO. */
7452 add_vcall_offset_vtbl_entries_r (tree binfo
, vtbl_init_data
* vid
)
7458 /* Don't walk into virtual bases -- except, of course, for the
7459 virtual base for which we are building vcall offsets. Any
7460 primary virtual base will have already had its offsets generated
7461 through the recursion in build_vcall_and_vbase_vtbl_entries. */
7462 if (BINFO_VIRTUAL_P (binfo
) && vid
->vbase
!= binfo
)
7465 /* If BINFO has a primary base, process it first. */
7466 primary_binfo
= get_primary_binfo (binfo
);
7468 add_vcall_offset_vtbl_entries_r (primary_binfo
, vid
);
7470 /* Add BINFO itself to the list. */
7471 add_vcall_offset_vtbl_entries_1 (binfo
, vid
);
7473 /* Scan the non-primary bases of BINFO. */
7474 for (i
= 0; BINFO_BASE_ITERATE (binfo
, i
, base_binfo
); ++i
)
7475 if (base_binfo
!= primary_binfo
)
7476 add_vcall_offset_vtbl_entries_r (base_binfo
, vid
);
7479 /* Called from build_vcall_offset_vtbl_entries_r. */
7482 add_vcall_offset_vtbl_entries_1 (tree binfo
, vtbl_init_data
* vid
)
7484 /* Make entries for the rest of the virtuals. */
7485 if (abi_version_at_least (2))
7489 /* The ABI requires that the methods be processed in declaration
7490 order. G++ 3.2 used the order in the vtable. */
7491 for (orig_fn
= TYPE_METHODS (BINFO_TYPE (binfo
));
7493 orig_fn
= TREE_CHAIN (orig_fn
))
7494 if (DECL_VINDEX (orig_fn
))
7495 add_vcall_offset (orig_fn
, binfo
, vid
);
7499 tree derived_virtuals
;
7502 /* If BINFO is a primary base, the most derived class which has
7503 BINFO as a primary base; otherwise, just BINFO. */
7504 tree non_primary_binfo
;
7506 /* We might be a primary base class. Go up the inheritance hierarchy
7507 until we find the most derived class of which we are a primary base:
7508 it is the BINFO_VIRTUALS there that we need to consider. */
7509 non_primary_binfo
= binfo
;
7510 while (BINFO_INHERITANCE_CHAIN (non_primary_binfo
))
7514 /* If we have reached a virtual base, then it must be vid->vbase,
7515 because we ignore other virtual bases in
7516 add_vcall_offset_vtbl_entries_r. In turn, it must be a primary
7517 base (possibly multi-level) of vid->binfo, or we wouldn't
7518 have called build_vcall_and_vbase_vtbl_entries for it. But it
7519 might be a lost primary, so just skip down to vid->binfo. */
7520 if (BINFO_VIRTUAL_P (non_primary_binfo
))
7522 gcc_assert (non_primary_binfo
== vid
->vbase
);
7523 non_primary_binfo
= vid
->binfo
;
7527 b
= BINFO_INHERITANCE_CHAIN (non_primary_binfo
);
7528 if (get_primary_binfo (b
) != non_primary_binfo
)
7530 non_primary_binfo
= b
;
7533 if (vid
->ctor_vtbl_p
)
7534 /* For a ctor vtable we need the equivalent binfo within the hierarchy
7535 where rtti_binfo is the most derived type. */
7537 = original_binfo (non_primary_binfo
, vid
->rtti_binfo
);
7539 for (base_virtuals
= BINFO_VIRTUALS (binfo
),
7540 derived_virtuals
= BINFO_VIRTUALS (non_primary_binfo
),
7541 orig_virtuals
= BINFO_VIRTUALS (TYPE_BINFO (BINFO_TYPE (binfo
)));
7543 base_virtuals
= TREE_CHAIN (base_virtuals
),
7544 derived_virtuals
= TREE_CHAIN (derived_virtuals
),
7545 orig_virtuals
= TREE_CHAIN (orig_virtuals
))
7549 /* Find the declaration that originally caused this function to
7550 be present in BINFO_TYPE (binfo). */
7551 orig_fn
= BV_FN (orig_virtuals
);
7553 /* When processing BINFO, we only want to generate vcall slots for
7554 function slots introduced in BINFO. So don't try to generate
7555 one if the function isn't even defined in BINFO. */
7556 if (!SAME_BINFO_TYPE_P (BINFO_TYPE (binfo
), DECL_CONTEXT (orig_fn
)))
7559 add_vcall_offset (orig_fn
, binfo
, vid
);
7564 /* Add a vcall offset entry for ORIG_FN to the vtable. */
7567 add_vcall_offset (tree orig_fn
, tree binfo
, vtbl_init_data
*vid
)
7572 /* If there is already an entry for a function with the same
7573 signature as FN, then we do not need a second vcall offset.
7574 Check the list of functions already present in the derived
7576 for (i
= 0; i
< VARRAY_ACTIVE_SIZE (vid
->fns
); ++i
)
7580 derived_entry
= VARRAY_TREE (vid
->fns
, i
);
7581 if (same_signature_p (derived_entry
, orig_fn
)
7582 /* We only use one vcall offset for virtual destructors,
7583 even though there are two virtual table entries. */
7584 || (DECL_DESTRUCTOR_P (derived_entry
)
7585 && DECL_DESTRUCTOR_P (orig_fn
)))
7589 /* If we are building these vcall offsets as part of building
7590 the vtable for the most derived class, remember the vcall
7592 if (vid
->binfo
== TYPE_BINFO (vid
->derived
))
7594 tree_pair_p elt
= VEC_safe_push (tree_pair_s
,
7595 CLASSTYPE_VCALL_INDICES (vid
->derived
),
7597 elt
->purpose
= orig_fn
;
7598 elt
->value
= vid
->index
;
7601 /* The next vcall offset will be found at a more negative
7603 vid
->index
= size_binop (MINUS_EXPR
, vid
->index
,
7604 ssize_int (TARGET_VTABLE_DATA_ENTRY_DISTANCE
));
7606 /* Keep track of this function. */
7607 VARRAY_PUSH_TREE (vid
->fns
, orig_fn
);
7609 if (vid
->generate_vcall_entries
)
7614 /* Find the overriding function. */
7615 fn
= find_final_overrider (vid
->rtti_binfo
, binfo
, orig_fn
);
7616 if (fn
== error_mark_node
)
7617 vcall_offset
= build1 (NOP_EXPR
, vtable_entry_type
,
7621 base
= TREE_VALUE (fn
);
7623 /* The vbase we're working on is a primary base of
7624 vid->binfo. But it might be a lost primary, so its
7625 BINFO_OFFSET might be wrong, so we just use the
7626 BINFO_OFFSET from vid->binfo. */
7627 vcall_offset
= size_diffop (BINFO_OFFSET (base
),
7628 BINFO_OFFSET (vid
->binfo
));
7629 vcall_offset
= fold (build1 (NOP_EXPR
, vtable_entry_type
,
7632 /* Add the initializer to the vtable. */
7633 *vid
->last_init
= build_tree_list (NULL_TREE
, vcall_offset
);
7634 vid
->last_init
= &TREE_CHAIN (*vid
->last_init
);
7638 /* Return vtbl initializers for the RTTI entries corresponding to the
7639 BINFO's vtable. The RTTI entries should indicate the object given
7640 by VID->rtti_binfo. */
7643 build_rtti_vtbl_entries (tree binfo
, vtbl_init_data
* vid
)
7652 basetype
= BINFO_TYPE (binfo
);
7653 t
= BINFO_TYPE (vid
->rtti_binfo
);
7655 /* To find the complete object, we will first convert to our most
7656 primary base, and then add the offset in the vtbl to that value. */
7658 while (CLASSTYPE_HAS_PRIMARY_BASE_P (BINFO_TYPE (b
))
7659 && !BINFO_LOST_PRIMARY_P (b
))
7663 primary_base
= get_primary_binfo (b
);
7664 gcc_assert (BINFO_PRIMARY_P (primary_base
)
7665 && BINFO_INHERITANCE_CHAIN (primary_base
) == b
);
7668 offset
= size_diffop (BINFO_OFFSET (vid
->rtti_binfo
), BINFO_OFFSET (b
));
7670 /* The second entry is the address of the typeinfo object. */
7672 decl
= build_address (get_tinfo_decl (t
));
7674 decl
= integer_zero_node
;
7676 /* Convert the declaration to a type that can be stored in the
7678 init
= build_nop (vfunc_ptr_type_node
, decl
);
7679 *vid
->last_init
= build_tree_list (NULL_TREE
, init
);
7680 vid
->last_init
= &TREE_CHAIN (*vid
->last_init
);
7682 /* Add the offset-to-top entry. It comes earlier in the vtable that
7683 the the typeinfo entry. Convert the offset to look like a
7684 function pointer, so that we can put it in the vtable. */
7685 init
= build_nop (vfunc_ptr_type_node
, offset
);
7686 *vid
->last_init
= build_tree_list (NULL_TREE
, init
);
7687 vid
->last_init
= &TREE_CHAIN (*vid
->last_init
);
7690 /* Fold a OBJ_TYPE_REF expression to the address of a function.
7691 KNOWN_TYPE carries the true type of OBJ_TYPE_REF_OBJECT(REF). */
7694 cp_fold_obj_type_ref (tree ref
, tree known_type
)
7696 HOST_WIDE_INT index
= tree_low_cst (OBJ_TYPE_REF_TOKEN (ref
), 1);
7697 HOST_WIDE_INT i
= 0;
7698 tree v
= BINFO_VIRTUALS (TYPE_BINFO (known_type
));
7703 i
+= (TARGET_VTABLE_USES_DESCRIPTORS
7704 ? TARGET_VTABLE_USES_DESCRIPTORS
: 1);
7710 #ifdef ENABLE_CHECKING
7711 gcc_assert (tree_int_cst_equal (OBJ_TYPE_REF_TOKEN (ref
),
7712 DECL_VINDEX (fndecl
)));
7715 return build_address (fndecl
);
7718 #include "gt-cp-class.h"