1 /* Functions related to building classes and their related objects.
2 Copyright (C) 1987, 92-99, 2000 Free Software Foundation, Inc.
3 Contributed by Michael Tiemann (tiemann@cygnus.com)
5 This file is part of GNU CC.
7 GNU CC is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2, or (at your option)
12 GNU CC is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with GNU CC; see the file COPYING. If not, write to
19 the Free Software Foundation, 59 Temple Place - Suite 330,
20 Boston, MA 02111-1307, USA. */
23 /* High-level class interface. */
37 #define obstack_chunk_alloc xmalloc
38 #define obstack_chunk_free free
40 /* This is how we tell when two virtual member functions are really the
42 #define SAME_FN(FN1DECL, FN2DECL) (DECL_ASSEMBLER_NAME (FN1DECL) == DECL_ASSEMBLER_NAME (FN2DECL))
44 extern void set_class_shadows PARAMS ((tree));
46 /* The number of nested classes being processed. If we are not in the
47 scope of any class, this is zero. */
49 int current_class_depth;
51 /* In order to deal with nested classes, we keep a stack of classes.
52 The topmost entry is the innermost class, and is the entry at index
53 CURRENT_CLASS_DEPTH */
55 typedef struct class_stack_node {
56 /* The name of the class. */
59 /* The _TYPE node for the class. */
62 /* The access specifier pending for new declarations in the scope of
66 /* If were defining TYPE, the names used in this class. */
67 splay_tree names_used;
68 }* class_stack_node_t;
70 /* The stack itself. This is an dynamically resized array. The
71 number of elements allocated is CURRENT_CLASS_STACK_SIZE. */
72 static int current_class_stack_size;
73 static class_stack_node_t current_class_stack;
75 static tree get_vfield_name PARAMS ((tree));
76 static void finish_struct_anon PARAMS ((tree));
77 static tree build_vbase_pointer PARAMS ((tree, tree));
78 static tree build_vtable_entry PARAMS ((tree, tree, tree));
79 static tree get_vtable_name PARAMS ((tree));
80 static tree get_derived_offset PARAMS ((tree, tree));
81 static tree get_basefndecls PARAMS ((tree, tree));
82 static void set_rtti_entry PARAMS ((tree, tree, tree));
83 static int build_primary_vtable PARAMS ((tree, tree));
84 static int build_secondary_vtable PARAMS ((tree, tree));
85 static tree dfs_finish_vtbls PARAMS ((tree, void *));
86 static void finish_vtbls PARAMS ((tree));
87 static void modify_vtable_entry PARAMS ((tree, tree, tree, tree, tree *));
88 static void add_virtual_function PARAMS ((tree *, tree *, int *, tree, tree));
89 static tree delete_duplicate_fields_1 PARAMS ((tree, tree));
90 static void delete_duplicate_fields PARAMS ((tree));
91 static void finish_struct_bits PARAMS ((tree));
92 static int alter_access PARAMS ((tree, tree, tree, tree));
93 static void handle_using_decl PARAMS ((tree, tree));
94 static int overrides PARAMS ((tree, tree));
95 static int strictly_overrides PARAMS ((tree, tree));
96 static void mark_overriders PARAMS ((tree, tree));
97 static void check_for_override PARAMS ((tree, tree));
98 static tree dfs_modify_vtables PARAMS ((tree, void *));
99 static tree modify_all_vtables PARAMS ((tree, int *, tree));
100 static void determine_primary_base PARAMS ((tree, int *));
101 static void finish_struct_methods PARAMS ((tree));
102 static void maybe_warn_about_overly_private_class PARAMS ((tree));
103 static int field_decl_cmp PARAMS ((const tree *, const tree *));
104 static int method_name_cmp PARAMS ((const tree *, const tree *));
105 static tree add_implicitly_declared_members PARAMS ((tree, int, int, int));
106 static tree fixed_type_or_null PARAMS ((tree, int *));
107 static tree resolve_address_of_overloaded_function PARAMS ((tree, tree, int,
109 static void build_vtable_entry_ref PARAMS ((tree, tree, tree));
110 static tree build_vtbl_initializer PARAMS ((tree, tree));
111 static int count_fields PARAMS ((tree));
112 static int add_fields_to_vec PARAMS ((tree, tree, int));
113 static void check_bitfield_decl PARAMS ((tree));
114 static void check_field_decl PARAMS ((tree, tree, int *, int *, int *, int *));
115 static void check_field_decls PARAMS ((tree, tree *, int *, int *, int *,
117 static int avoid_overlap PARAMS ((tree, tree, int *));
118 static tree build_base_field PARAMS ((tree, tree, int *, int *, unsigned int *));
119 static tree build_base_fields PARAMS ((tree, int *));
120 static tree build_vbase_pointer_fields PARAMS ((tree, int *));
121 static tree build_vtbl_or_vbase_field PARAMS ((tree, tree, tree, tree, tree,
123 static void check_methods PARAMS ((tree));
124 static void remove_zero_width_bit_fields PARAMS ((tree));
125 static void check_bases PARAMS ((tree, int *, int *, int *));
126 static void check_bases_and_members PARAMS ((tree, int *));
127 static void create_vtable_ptr PARAMS ((tree, int *, int *, tree *, tree *));
128 static void layout_class_type PARAMS ((tree, int *, int *, tree *, tree *));
129 static void fixup_pending_inline PARAMS ((struct pending_inline *));
130 static void fixup_inline_methods PARAMS ((tree));
131 static void set_primary_base PARAMS ((tree, int, int *));
132 static tree dfs_propagate_binfo_offsets PARAMS ((tree, void *));
133 static void propagate_binfo_offsets PARAMS ((tree, tree));
134 static void layout_basetypes PARAMS ((tree));
135 static void layout_virtual_bases PARAMS ((tree));
136 static void remove_base_field PARAMS ((tree, tree, tree *));
137 static void remove_base_fields PARAMS ((tree));
138 static tree dfs_set_offset_for_shared_vbases PARAMS ((tree, void *));
139 static tree dfs_set_offset_for_unshared_vbases PARAMS ((tree, void *));
140 static tree dfs_build_vbase_offset_vtbl_entries PARAMS ((tree, void *));
141 static tree build_vbase_offset_vtbl_entries PARAMS ((tree, tree));
142 static tree dfs_vcall_offset_queue_p PARAMS ((tree, void *));
143 static tree dfs_build_vcall_offset_vtbl_entries PARAMS ((tree, void *));
144 static tree build_vcall_offset_vtbl_entries PARAMS ((tree, tree));
145 static tree dfs_count_virtuals PARAMS ((tree, void *));
146 static void start_vtable PARAMS ((tree, int *));
147 static void layout_vtable_decl PARAMS ((tree, int));
148 static int num_vfun_entries PARAMS ((tree));
149 static tree dfs_find_final_overrider PARAMS ((tree, void *));
150 static tree find_final_overrider PARAMS ((tree, tree, tree));
151 static tree dfs_find_base PARAMS ((tree, void *));
152 static int make_new_vtable PARAMS ((tree, tree));
153 extern void dump_class_hierarchy PARAMS ((tree, int));
155 /* Variables shared between class.c and call.c. */
157 #ifdef GATHER_STATISTICS
159 int n_vtable_entries = 0;
160 int n_vtable_searches = 0;
161 int n_vtable_elems = 0;
162 int n_convert_harshness = 0;
163 int n_compute_conversion_costs = 0;
164 int n_build_method_call = 0;
165 int n_inner_fields_searched = 0;
168 /* Virtual base class layout. */
170 /* Returns a list of virtual base class pointers as a chain of
174 build_vbase_pointer_fields (rec, empty_p)
178 /* Chain to hold all the new FIELD_DECLs which point at virtual
180 tree vbase_decls = NULL_TREE;
181 tree binfos = TYPE_BINFO_BASETYPES (rec);
182 int n_baseclasses = CLASSTYPE_N_BASECLASSES (rec);
186 /* Under the new ABI, there are no vbase pointers in the object.
187 Instead, the offsets are stored in the vtable. */
188 if (vbase_offsets_in_vtable_p ())
191 /* Loop over the baseclasses, adding vbase pointers as needed. */
192 for (i = 0; i < n_baseclasses; i++)
194 register tree base_binfo = TREE_VEC_ELT (binfos, i);
195 register tree basetype = BINFO_TYPE (base_binfo);
197 if (TYPE_SIZE (basetype) == 0)
198 /* This error is now reported in xref_tag, thus giving better
199 location information. */
202 /* All basetypes are recorded in the association list of the
205 if (TREE_VIA_VIRTUAL (base_binfo))
210 /* The offset for a virtual base class is only used in computing
211 virtual function tables and for initializing virtual base
212 pointers. It is built once `get_vbase_types' is called. */
214 /* If this basetype can come from another vbase pointer
215 without an additional indirection, we will share
216 that pointer. If an indirection is involved, we
217 make our own pointer. */
218 for (j = 0; j < n_baseclasses; j++)
220 tree other_base_binfo = TREE_VEC_ELT (binfos, j);
221 if (! TREE_VIA_VIRTUAL (other_base_binfo)
222 && BINFO_FOR_VBASE (basetype, BINFO_TYPE (other_base_binfo)))
225 FORMAT_VBASE_NAME (name, basetype);
226 decl = build_vtbl_or_vbase_field (get_identifier (name),
227 get_identifier (VTABLE_BASE),
228 build_pointer_type (basetype),
232 BINFO_VPTR_FIELD (base_binfo) = decl;
233 TREE_CHAIN (decl) = vbase_decls;
238 /* The space this decl occupies has already been accounted for. */
246 /* Called from build_vbase_offset_vtbl_entries via dfs_walk. */
249 dfs_build_vbase_offset_vtbl_entries (binfo, data)
253 tree list = (tree) data;
255 if (TREE_TYPE (list) == binfo)
256 /* The TREE_TYPE of LIST is the base class from which we started
257 walking. If that BINFO is virtual it's not a virtual baseclass
260 else if (TREE_VIA_VIRTUAL (binfo))
265 /* Remember the index to the vbase offset for this virtual
267 vbase = BINFO_FOR_VBASE (TREE_TYPE (binfo), TREE_PURPOSE (list));
268 if (!TREE_VALUE (list))
269 BINFO_VPTR_FIELD (vbase) = build_int_2 (-1, 0);
272 BINFO_VPTR_FIELD (vbase) = TREE_PURPOSE (TREE_VALUE (list));
273 BINFO_VPTR_FIELD (vbase) = ssize_binop (MINUS_EXPR,
274 BINFO_VPTR_FIELD (vbase),
278 /* And record the offset at which this virtual base lies in the
280 init = BINFO_OFFSET (binfo);
281 TREE_VALUE (list) = tree_cons (BINFO_VPTR_FIELD (vbase),
286 SET_BINFO_VTABLE_PATH_MARKED (binfo);
291 /* Returns the initializers for the vbase offset entries in the vtable
292 for BINFO (which is part of the class hierarchy dominated by T), in
296 build_vbase_offset_vtbl_entries (binfo, t)
304 /* Under the old ABI, pointers to virtual bases are stored in each
306 if (!vbase_offsets_in_vtable_p ())
309 /* If there are no virtual baseclasses, then there is nothing to
311 if (!TYPE_USES_VIRTUAL_BASECLASSES (BINFO_TYPE (binfo)))
316 /* The offsets are allocated in the reverse order of a
317 depth-first left-to-right traversal of the hierarchy. We use
318 BINFO_VTABLE_PATH_MARKED because we are ourselves during a
319 dfs_walk, and so BINFO_MARKED is already in use. */
320 list = build_tree_list (t, NULL_TREE);
321 TREE_TYPE (list) = binfo;
323 dfs_build_vbase_offset_vtbl_entries,
324 dfs_vtable_path_unmarked_real_bases_queue_p,
327 dfs_vtable_path_unmark,
328 dfs_vtable_path_marked_real_bases_queue_p,
330 inits = nreverse (TREE_VALUE (list));
332 /* We've now got offsets in the right order. However, the offsets
333 we've stored are offsets from the beginning of the complete
334 object, and we need offsets from this BINFO. */
335 for (init = inits; init; init = TREE_CHAIN (init))
337 tree exp = TREE_VALUE (init);
339 exp = ssize_binop (MINUS_EXPR, exp, BINFO_OFFSET (binfo));
340 exp = build1 (NOP_EXPR, vtable_entry_type, exp);
342 TREE_CONSTANT (exp) = 1;
343 /* The dfs_build_vbase_offset_vtbl_entries routine uses the
344 TREE_PURPOSE to scribble in. But, we need to clear it now so
345 that the values are not perceived as labeled initializers. */
346 TREE_PURPOSE (init) = NULL_TREE;
347 TREE_VALUE (init) = exp;
353 typedef struct vcall_offset_data_s
355 /* The binfo for the most-derived type. */
357 /* The binfo for the virtual base for which we're building
360 /* The vcall offset initializers built up so far. */
362 /* The number of vcall offsets accumulated. */
366 /* Called from build_vcall_offset_vtbl_entries via dfs_walk. */
369 dfs_vcall_offset_queue_p (binfo, data)
373 vcall_offset_data* vod = (vcall_offset_data *) data;
375 return (binfo == vod->vbase) ? binfo : dfs_skip_vbases (binfo, NULL);
378 /* Called from build_vcall_offset_vtbl_entries via dfs_walk. */
381 dfs_build_vcall_offset_vtbl_entries (binfo, data)
385 vcall_offset_data* vod;
389 /* Primary bases are not interesting; all of the virtual
390 function table entries have been overridden. */
391 if (BINFO_PRIMARY_MARKED_P (binfo))
394 vod = (vcall_offset_data *) data;
395 binfo_inits = NULL_TREE;
397 /* We chain the offsets on in reverse order. That's correct --
398 build_vtbl_initializer will straighten them out. */
399 for (virtuals = skip_rtti_stuff (binfo,
403 virtuals = TREE_CHAIN (virtuals))
410 /* Figure out what function we're looking at. */
411 fn = TREE_VALUE (virtuals);
412 base = DECL_CONTEXT (fn);
414 /* The FN is comes from BASE. So, we must caculate the
415 adjustment from the virtual base that derived from BINFO to
417 base_binfo = get_binfo (base, vod->derived, /*protect=*/0);
418 offset = ssize_binop (MINUS_EXPR,
419 BINFO_OFFSET (base_binfo),
420 BINFO_OFFSET (vod->vbase));
421 offset = build1 (NOP_EXPR, vtable_entry_type, offset);
422 offset = fold (offset);
423 TREE_CONSTANT (offset) = 1;
424 binfo_inits = tree_cons (NULL_TREE, offset, binfo_inits);
427 /* Now add the initializers we've just created to the list that will
428 be returned to our caller. */
429 vod->inits = chainon (vod->inits, binfo_inits);
434 /* Returns the initializers for the vcall offset entries in the vtable
435 for BINFO (which is part of the class hierarchy dominated by T), in
439 build_vcall_offset_vtbl_entries (binfo, t)
443 vcall_offset_data vod;
445 /* Under the old ABI, the adjustments to the `this' pointer were made
447 if (!vcall_offsets_in_vtable_p ())
450 /* We only need these entries if this base is a virtual base. */
451 if (!TREE_VIA_VIRTUAL (binfo))
454 /* We need a vcall offset for each of the virtual functions in this
457 class A { virtual void f (); };
458 class B : virtual public A { };
459 class C: virtual public A, public B {};
466 The location of `A' is not at a fixed offset relative to `B'; the
467 offset depends on the complete object derived from `B'. So,
468 `B' vtable contains an entry for `f' that indicates by what
469 amount the `this' pointer for `B' needs to be adjusted to arrive
472 We need entries for all the functions in our primary vtable and
473 in our non-virtual bases vtables. For each base, the entries
474 appear in the same order as in the base; but the bases themselves
475 appear in reverse depth-first, left-to-right order. */
478 vod.inits = NULL_TREE;
480 dfs_build_vcall_offset_vtbl_entries,
481 dfs_vcall_offset_queue_p,
487 /* Returns a pointer to the virtual base class of EXP that has the
488 indicated TYPE. EXP is of class type, not a pointer type. */
491 build_vbase_pointer (exp, type)
494 if (vbase_offsets_in_vtable_p ())
499 /* Find the shared copy of TYPE; that's where the vtable offset
501 vbase = BINFO_FOR_VBASE (type, TREE_TYPE (exp));
502 /* Find the virtual function table pointer. */
503 vbase_ptr = build_vfield_ref (exp, TREE_TYPE (exp));
504 /* Compute the location where the offset will lie. */
505 vbase_ptr = build_binary_op (PLUS_EXPR,
507 BINFO_VPTR_FIELD (vbase));
508 vbase_ptr = build1 (NOP_EXPR,
509 build_pointer_type (ptrdiff_type_node),
511 /* Add the contents of this location to EXP. */
512 return build (PLUS_EXPR,
513 build_pointer_type (type),
514 build_unary_op (ADDR_EXPR, exp, /*noconvert=*/0),
515 build1 (INDIRECT_REF, ptrdiff_type_node, vbase_ptr));
520 FORMAT_VBASE_NAME (name, type);
521 return build_component_ref (exp, get_identifier (name), NULL_TREE, 0);
525 /* Build multi-level access to EXPR using hierarchy path PATH.
526 CODE is PLUS_EXPR if we are going with the grain,
527 and MINUS_EXPR if we are not (in which case, we cannot traverse
528 virtual baseclass links).
530 TYPE is the type we want this path to have on exit.
532 NONNULL is non-zero if we know (for any reason) that EXPR is
533 not, in fact, zero. */
536 build_vbase_path (code, type, expr, path, nonnull)
538 tree type, expr, path;
541 register int changed = 0;
542 tree last = NULL_TREE, last_virtual = NULL_TREE;
544 tree null_expr = 0, nonnull_expr;
546 tree offset = integer_zero_node;
548 if (BINFO_INHERITANCE_CHAIN (path) == NULL_TREE)
549 return build1 (NOP_EXPR, type, expr);
551 /* We could do better if we had additional logic to convert back to the
552 unconverted type (the static type of the complete object), and then
553 convert back to the type we want. Until that is done, we only optimize
554 if the complete type is the same type as expr has. */
555 fixed_type_p = resolves_to_fixed_type_p (expr, &nonnull);
557 if (!fixed_type_p && TREE_SIDE_EFFECTS (expr))
558 expr = save_expr (expr);
561 path = reverse_path (path);
563 basetype = BINFO_TYPE (path);
567 if (TREE_VIA_VIRTUAL (TREE_VALUE (path)))
569 last_virtual = BINFO_TYPE (TREE_VALUE (path));
570 if (code == PLUS_EXPR)
572 changed = ! fixed_type_p;
578 /* We already check for ambiguous things in the caller, just
582 tree binfo = get_binfo (last, TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (nonnull_expr))), 0);
583 nonnull_expr = convert_pointer_to_real (binfo, nonnull_expr);
585 ind = build_indirect_ref (nonnull_expr, NULL_PTR);
586 nonnull_expr = build_vbase_pointer (ind, last_virtual);
588 && TREE_CODE (type) == POINTER_TYPE
589 && null_expr == NULL_TREE)
591 null_expr = build1 (NOP_EXPR, build_pointer_type (last_virtual), integer_zero_node);
592 expr = build (COND_EXPR, build_pointer_type (last_virtual),
593 build (EQ_EXPR, boolean_type_node, expr,
595 null_expr, nonnull_expr);
598 /* else we'll figure out the offset below. */
600 /* Happens in the case of parse errors. */
601 if (nonnull_expr == error_mark_node)
602 return error_mark_node;
606 cp_error ("cannot cast up from virtual baseclass `%T'",
608 return error_mark_node;
611 last = TREE_VALUE (path);
612 path = TREE_CHAIN (path);
614 /* LAST is now the last basetype assoc on the path. */
616 /* A pointer to a virtual base member of a non-null object
617 is non-null. Therefore, we only need to test for zeroness once.
618 Make EXPR the canonical expression to deal with here. */
621 TREE_OPERAND (expr, 2) = nonnull_expr;
622 TREE_TYPE (expr) = TREE_TYPE (TREE_OPERAND (expr, 1))
623 = TREE_TYPE (nonnull_expr);
628 /* If we go through any virtual base pointers, make sure that
629 casts to BASETYPE from the last virtual base class use
630 the right value for BASETYPE. */
633 tree intype = TREE_TYPE (TREE_TYPE (expr));
634 if (TYPE_MAIN_VARIANT (intype) != BINFO_TYPE (last))
636 tree binfo = get_binfo (last, TYPE_MAIN_VARIANT (intype), 0);
637 offset = BINFO_OFFSET (binfo);
641 offset = BINFO_OFFSET (last);
643 if (TREE_INT_CST_LOW (offset))
645 /* Bash types to make the backend happy. */
646 offset = cp_convert (type, offset);
648 /* This shouldn't be necessary. (mrs) */
649 expr = build1 (NOP_EXPR, type, expr);
652 /* If expr might be 0, we need to preserve that zeroness. */
656 TREE_TYPE (null_expr) = type;
658 null_expr = build1 (NOP_EXPR, type, integer_zero_node);
659 if (TREE_SIDE_EFFECTS (expr))
660 expr = save_expr (expr);
662 return build (COND_EXPR, type,
663 build (EQ_EXPR, boolean_type_node, expr, integer_zero_node),
665 build (code, type, expr, offset));
667 else return build (code, type, expr, offset);
670 /* Cannot change the TREE_TYPE of a NOP_EXPR here, since it may
671 be used multiple times in initialization of multiple inheritance. */
674 TREE_TYPE (expr) = type;
678 return build1 (NOP_EXPR, type, expr);
682 /* Virtual function things. */
684 /* Build an entry in the virtual function table. DELTA is the offset
685 for the `this' pointer. VCALL_INDEX is the vtable index containing
686 the vcall offset; zero if none. FNDECL is the virtual function
690 build_vtable_entry (delta, vcall_index, fndecl)
697 /* Take the address of the function, considering it to be of an
698 appropriate generic type. */
699 pfn = build1 (ADDR_EXPR, vfunc_ptr_type_node, fndecl);
700 /* The address of a function can't change. */
701 TREE_CONSTANT (pfn) = 1;
703 if (flag_vtable_thunks)
705 HOST_WIDE_INT idelta;
706 HOST_WIDE_INT ivindex;
708 idelta = TREE_INT_CST_LOW (delta);
709 ivindex = TREE_INT_CST_LOW (vcall_index);
710 if ((idelta || ivindex)
711 && ! DECL_PURE_VIRTUAL_P (TREE_OPERAND (pfn, 0)))
713 pfn = make_thunk (pfn, idelta, ivindex);
714 pfn = build1 (ADDR_EXPR, vtable_entry_type, pfn);
715 TREE_READONLY (pfn) = 1;
716 TREE_CONSTANT (pfn) = 1;
718 #ifdef GATHER_STATISTICS
719 n_vtable_entries += 1;
725 extern int flag_huge_objects;
726 tree elems = tree_cons (NULL_TREE, delta,
727 tree_cons (NULL_TREE, integer_zero_node,
728 build_tree_list (NULL_TREE, pfn)));
729 tree entry = build (CONSTRUCTOR, vtable_entry_type, NULL_TREE, elems);
731 /* We don't use vcall offsets when not using vtable thunks. */
732 my_friendly_assert (integer_zerop (vcall_index), 20000125);
734 /* DELTA used to be constructed by `size_int' and/or size_binop,
735 which caused overflow problems when it was negative. That should
738 if (! int_fits_type_p (delta, delta_type_node))
740 if (flag_huge_objects)
741 sorry ("object size exceeds built-in limit for virtual function table implementation");
743 sorry ("object size exceeds normal limit for virtual function table implementation, recompile all source and use -fhuge-objects");
746 TREE_CONSTANT (entry) = 1;
747 TREE_STATIC (entry) = 1;
748 TREE_READONLY (entry) = 1;
750 #ifdef GATHER_STATISTICS
751 n_vtable_entries += 1;
758 /* We want to give the assembler the vtable identifier as well as
759 the offset to the function pointer. So we generate
761 __asm__ __volatile__ (".vtable_entry %c0, %c1"
762 : : "s"(&class_vtable),
763 "i"((long)&vtbl[idx].pfn - (long)&vtbl[0])); */
766 build_vtable_entry_ref (basetype, vtbl, idx)
767 tree basetype, vtbl, idx;
769 static char asm_stmt[] = ".vtable_entry %c0, %c1";
772 s = build_unary_op (ADDR_EXPR, TYPE_BINFO_VTABLE (basetype), 0);
773 s = build_tree_list (build_string (1, "s"), s);
775 i = build_array_ref (vtbl, idx);
776 if (!flag_vtable_thunks)
777 i = build_component_ref (i, pfn_identifier, vtable_entry_type, 0);
778 i = build_c_cast (ptrdiff_type_node, build_unary_op (ADDR_EXPR, i, 0));
779 i2 = build_array_ref (vtbl, build_int_2(0,0));
780 i2 = build_c_cast (ptrdiff_type_node, build_unary_op (ADDR_EXPR, i2, 0));
781 i = build_binary_op (MINUS_EXPR, i, i2);
782 i = build_tree_list (build_string (1, "i"), i);
784 finish_asm_stmt (ridpointers[RID_VOLATILE],
785 build_string (sizeof(asm_stmt)-1, asm_stmt),
786 NULL_TREE, chainon (s, i), NULL_TREE);
789 /* Given an object INSTANCE, return an expression which yields the
790 virtual function vtable element corresponding to INDEX. There are
791 many special cases for INSTANCE which we take care of here, mainly
792 to avoid creating extra tree nodes when we don't have to. */
795 build_vtbl_ref (instance, idx)
799 tree basetype = TREE_TYPE (instance);
801 if (TREE_CODE (basetype) == REFERENCE_TYPE)
802 basetype = TREE_TYPE (basetype);
804 if (instance == current_class_ref)
805 vtbl = build_vfield_ref (instance, basetype);
810 /* Try to figure out what a reference refers to, and
811 access its virtual function table directly. */
812 tree ref = NULL_TREE;
814 if (TREE_CODE (instance) == INDIRECT_REF
815 && TREE_CODE (TREE_TYPE (TREE_OPERAND (instance, 0))) == REFERENCE_TYPE)
816 ref = TREE_OPERAND (instance, 0);
817 else if (TREE_CODE (TREE_TYPE (instance)) == REFERENCE_TYPE)
820 if (ref && TREE_CODE (ref) == VAR_DECL
821 && DECL_INITIAL (ref))
823 tree init = DECL_INITIAL (ref);
825 while (TREE_CODE (init) == NOP_EXPR
826 || TREE_CODE (init) == NON_LVALUE_EXPR)
827 init = TREE_OPERAND (init, 0);
828 if (TREE_CODE (init) == ADDR_EXPR)
830 init = TREE_OPERAND (init, 0);
831 if (IS_AGGR_TYPE (TREE_TYPE (init))
832 && (TREE_CODE (init) == PARM_DECL
833 || TREE_CODE (init) == VAR_DECL))
839 if (IS_AGGR_TYPE (TREE_TYPE (instance))
840 && (TREE_CODE (instance) == RESULT_DECL
841 || TREE_CODE (instance) == PARM_DECL
842 || TREE_CODE (instance) == VAR_DECL))
843 vtbl = TYPE_BINFO_VTABLE (basetype);
845 vtbl = build_vfield_ref (instance, basetype);
848 assemble_external (vtbl);
851 build_vtable_entry_ref (basetype, vtbl, idx);
853 aref = build_array_ref (vtbl, idx);
858 /* Given an object INSTANCE, return an expression which yields the
859 virtual function corresponding to INDEX. There are many special
860 cases for INSTANCE which we take care of here, mainly to avoid
861 creating extra tree nodes when we don't have to. */
864 build_vfn_ref (ptr_to_instptr, instance, idx)
865 tree *ptr_to_instptr, instance;
868 tree aref = build_vtbl_ref (instance, idx);
870 /* When using thunks, there is no extra delta, and we get the pfn
872 if (flag_vtable_thunks)
877 /* Save the intermediate result in a SAVE_EXPR so we don't have to
878 compute each component of the virtual function pointer twice. */
879 if (TREE_CODE (aref) == INDIRECT_REF)
880 TREE_OPERAND (aref, 0) = save_expr (TREE_OPERAND (aref, 0));
883 = build (PLUS_EXPR, TREE_TYPE (*ptr_to_instptr),
885 cp_convert (ptrdiff_type_node,
886 build_component_ref (aref, delta_identifier, NULL_TREE, 0)));
889 return build_component_ref (aref, pfn_identifier, NULL_TREE, 0);
892 /* Return the name of the virtual function table (as an IDENTIFIER_NODE)
893 for the given TYPE. */
896 get_vtable_name (type)
899 tree type_id = build_typename_overload (type);
900 char *buf = (char *) alloca (strlen (VTABLE_NAME_PREFIX)
901 + IDENTIFIER_LENGTH (type_id) + 2);
902 const char *ptr = IDENTIFIER_POINTER (type_id);
904 for (i = 0; ptr[i] == OPERATOR_TYPENAME_FORMAT[i]; i++) ;
906 /* We don't take off the numbers; build_secondary_vtable uses the
907 DECL_ASSEMBLER_NAME for the type, which includes the number
908 in `3foo'. If we were to pull them off here, we'd end up with
909 something like `_vt.foo.3bar', instead of a uniform definition. */
910 while (ptr[i] >= '0' && ptr[i] <= '9')
913 sprintf (buf, "%s%s", VTABLE_NAME_PREFIX, ptr+i);
914 return get_identifier (buf);
917 /* Return the offset to the main vtable for a given base BINFO. */
920 get_vfield_offset (binfo)
924 = size_binop (FLOOR_DIV_EXPR,
925 DECL_FIELD_BITPOS (TYPE_VFIELD (BINFO_TYPE (binfo))),
926 size_int (BITS_PER_UNIT));
927 tmp = convert (sizetype, tmp);
928 return size_binop (PLUS_EXPR, tmp, BINFO_OFFSET (binfo));
931 /* Get the offset to the start of the original binfo that we derived
932 this binfo from. If we find TYPE first, return the offset only
933 that far. The shortened search is useful because the this pointer
934 on method calling is expected to point to a DECL_CONTEXT (fndecl)
935 object, and not a baseclass of it. */
938 get_derived_offset (binfo, type)
941 tree offset1 = get_vfield_offset (TYPE_BINFO (BINFO_TYPE (binfo)));
944 while (BINFO_BASETYPES (binfo)
945 && (i=CLASSTYPE_VFIELD_PARENT (BINFO_TYPE (binfo))) != -1)
947 tree binfos = BINFO_BASETYPES (binfo);
948 if (BINFO_TYPE (binfo) == type)
950 binfo = TREE_VEC_ELT (binfos, i);
952 offset2 = get_vfield_offset (TYPE_BINFO (BINFO_TYPE (binfo)));
953 return size_binop (MINUS_EXPR, offset1, offset2);
956 /* Update the rtti info for this class. */
959 set_rtti_entry (virtuals, offset, type)
960 tree virtuals, offset, type;
964 if (CLASSTYPE_COM_INTERFACE (type))
968 decl = get_tinfo_decl (type);
969 else if (!new_abi_rtti_p ())
970 /* If someone tries to get RTTI information for a type compiled
971 without RTTI, they're out of luck. By calling __pure_virtual
972 in this case, we give a small clue as to what went wrong. We
973 could consider having a __no_typeinfo function as well, for a
974 more specific hint. */
977 /* For the new-abi, we just point to the type_info object. */
980 if (flag_vtable_thunks)
982 /* The first slot holds the offset. */
983 BV_DELTA (virtuals) = offset;
984 BV_VCALL_INDEX (virtuals) = integer_zero_node;
986 /* The next node holds the decl. */
987 virtuals = TREE_CHAIN (virtuals);
988 offset = integer_zero_node;
991 /* This slot holds the function to call. */
992 BV_DELTA (virtuals) = offset;
993 BV_VCALL_INDEX (virtuals) = integer_zero_node;
994 BV_FN (virtuals) = decl;
997 /* Get the VAR_DECL of the vtable for TYPE. TYPE need not be polymorphic,
998 or even complete. If this does not exist, create it. If COMPLETE is
999 non-zero, then complete the definition of it -- that will render it
1000 impossible to actually build the vtable, but is useful to get at those
1001 which are known to exist in the runtime. */
1003 tree get_vtable_decl (type, complete)
1007 tree name = get_vtable_name (type);
1008 tree decl = IDENTIFIER_GLOBAL_VALUE (name);
1012 my_friendly_assert (TREE_CODE (decl) == VAR_DECL
1013 && DECL_VIRTUAL_P (decl), 20000118);
1017 decl = build_lang_decl (VAR_DECL, name, void_type_node);
1019 /* Set TREE_PUBLIC and TREE_EXTERN as appropriate. */
1020 import_export_vtable (decl, type, 0);
1022 decl = pushdecl_top_level (decl);
1023 SET_IDENTIFIER_GLOBAL_VALUE (name, decl);
1025 DECL_ARTIFICIAL (decl) = 1;
1026 TREE_STATIC (decl) = 1;
1027 #ifndef WRITABLE_VTABLES
1028 /* Make them READONLY by default. (mrs) */
1029 TREE_READONLY (decl) = 1;
1031 /* At one time the vtable info was grabbed 2 words at a time. This
1032 fails on sparc unless you have 8-byte alignment. (tiemann) */
1033 DECL_ALIGN (decl) = MAX (TYPE_ALIGN (double_type_node),
1036 DECL_VIRTUAL_P (decl) = 1;
1039 cp_finish_decl (decl, NULL_TREE, NULL_TREE, 0);
1041 DECL_CONTEXT (decl) = type;
1045 /* Build the primary virtual function table for TYPE. If BINFO is
1046 non-NULL, build the vtable starting with the initial approximation
1047 that it is the same as the one which is the head of the association
1048 list. Returns a non-zero value if a new vtable is actually
1052 build_primary_vtable (binfo, type)
1055 tree virtuals, decl;
1057 decl = get_vtable_decl (type, /*complete=*/0);
1063 if (BINFO_NEW_VTABLE_MARKED (binfo))
1064 /* We have already created a vtable for this base, so there's
1065 no need to do it again. */
1068 virtuals = copy_list (BINFO_VIRTUALS (binfo));
1069 TREE_TYPE (decl) = TREE_TYPE (BINFO_VTABLE (binfo));
1070 DECL_SIZE (decl) = TYPE_SIZE (TREE_TYPE (BINFO_VTABLE (binfo)));
1072 /* Now do rtti stuff. */
1073 offset = get_derived_offset (TYPE_BINFO (type), NULL_TREE);
1074 offset = ssize_binop (MINUS_EXPR, integer_zero_node, offset);
1075 set_rtti_entry (virtuals, offset, type);
1079 my_friendly_assert (TREE_CODE (TREE_TYPE (decl)) == VOID_TYPE,
1081 virtuals = NULL_TREE;
1084 #ifdef GATHER_STATISTICS
1086 n_vtable_elems += list_length (virtuals);
1089 /* Initialize the association list for this type, based
1090 on our first approximation. */
1091 TYPE_BINFO_VTABLE (type) = decl;
1092 TYPE_BINFO_VIRTUALS (type) = virtuals;
1094 binfo = TYPE_BINFO (type);
1095 SET_BINFO_NEW_VTABLE_MARKED (binfo);
1099 /* Give TYPE a new virtual function table which is initialized
1100 with a skeleton-copy of its original initialization. The only
1101 entry that changes is the `delta' entry, so we can really
1102 share a lot of structure.
1104 FOR_TYPE is the derived type which caused this table to
1107 BINFO is the type association which provided TYPE for FOR_TYPE.
1109 The order in which vtables are built (by calling this function) for
1110 an object must remain the same, otherwise a binary incompatibility
1114 build_secondary_vtable (binfo, for_type)
1115 tree binfo, for_type;
1118 tree orig_decl = BINFO_VTABLE (binfo);
1131 if (BINFO_NEW_VTABLE_MARKED (binfo))
1132 /* We already created a vtable for this base. There's no need to
1136 basetype = TYPE_MAIN_VARIANT (BINFO_TYPE (binfo));
1138 buf2 = TYPE_ASSEMBLER_NAME_STRING (basetype);
1139 i = TYPE_ASSEMBLER_NAME_LENGTH (basetype) + 1;
1141 /* We know that the vtable that we are going to create doesn't exist
1142 yet in the global namespace, and when we finish, it will be
1143 pushed into the global namespace. In complex MI hierarchies, we
1144 have to loop while the name we are thinking of adding is globally
1145 defined, adding more name components to the vtable name as we
1146 loop, until the name is unique. This is because in complex MI
1147 cases, we might have the same base more than once. This means
1148 that the order in which this function is called for vtables must
1149 remain the same, otherwise binary compatibility can be
1154 char *buf1 = (char *) alloca (TYPE_ASSEMBLER_NAME_LENGTH (for_type)
1158 sprintf (buf1, "%s%c%s", TYPE_ASSEMBLER_NAME_STRING (for_type), joiner,
1160 buf = (char *) alloca (strlen (VTABLE_NAME_PREFIX) + strlen (buf1) + 1);
1161 sprintf (buf, "%s%s", VTABLE_NAME_PREFIX, buf1);
1162 name = get_identifier (buf);
1164 /* If this name doesn't clash, then we can use it, otherwise
1165 we add more to the name until it is unique. */
1167 if (! IDENTIFIER_GLOBAL_VALUE (name))
1170 /* Set values for next loop through, if the name isn't unique. */
1172 path = BINFO_INHERITANCE_CHAIN (path);
1174 /* We better not run out of stuff to make it unique. */
1175 my_friendly_assert (path != NULL_TREE, 368);
1177 basetype = TYPE_MAIN_VARIANT (BINFO_TYPE (path));
1179 if (for_type == basetype)
1181 /* If we run out of basetypes in the path, we have already
1182 found created a vtable with that name before, we now
1183 resort to tacking on _%d to distinguish them. */
1185 i = TYPE_ASSEMBLER_NAME_LENGTH (basetype) + 1 + i + 1 + 3;
1186 buf1 = (char *) alloca (i);
1188 sprintf (buf1, "%s%c%s%c%d",
1189 TYPE_ASSEMBLER_NAME_STRING (basetype), joiner,
1191 buf = (char *) alloca (strlen (VTABLE_NAME_PREFIX)
1192 + strlen (buf1) + 1);
1193 sprintf (buf, "%s%s", VTABLE_NAME_PREFIX, buf1);
1194 name = get_identifier (buf);
1196 /* If this name doesn't clash, then we can use it,
1197 otherwise we add something different to the name until
1199 } while (++j <= 999 && IDENTIFIER_GLOBAL_VALUE (name));
1201 /* Hey, they really like MI don't they? Increase the 3
1202 above to 6, and the 999 to 999999. :-) */
1203 my_friendly_assert (j <= 999, 369);
1208 i = TYPE_ASSEMBLER_NAME_LENGTH (basetype) + 1 + i;
1209 new_buf2 = (char *) alloca (i);
1210 sprintf (new_buf2, "%s%c%s",
1211 TYPE_ASSEMBLER_NAME_STRING (basetype), joiner, buf2);
1215 new_decl = build_lang_decl (VAR_DECL, name, TREE_TYPE (orig_decl));
1216 /* Remember which class this vtable is really for. */
1217 DECL_CONTEXT (new_decl) = for_type;
1219 DECL_ARTIFICIAL (new_decl) = 1;
1220 TREE_STATIC (new_decl) = 1;
1221 BINFO_VTABLE (binfo) = pushdecl_top_level (new_decl);
1222 DECL_VIRTUAL_P (new_decl) = 1;
1223 #ifndef WRITABLE_VTABLES
1224 /* Make them READONLY by default. (mrs) */
1225 TREE_READONLY (new_decl) = 1;
1227 DECL_ALIGN (new_decl) = DECL_ALIGN (orig_decl);
1229 /* Make fresh virtual list, so we can smash it later. */
1230 BINFO_VIRTUALS (binfo) = copy_list (BINFO_VIRTUALS (binfo));
1232 if (TREE_VIA_VIRTUAL (binfo))
1234 tree binfo1 = BINFO_FOR_VBASE (BINFO_TYPE (binfo), for_type);
1236 /* XXX - This should never happen, if it does, the caller should
1237 ensure that the binfo is from for_type's binfos, not from any
1238 base type's. We can remove all this code after a while. */
1239 if (binfo1 != binfo)
1240 warning ("internal inconsistency: binfo offset error for rtti");
1242 offset = BINFO_OFFSET (binfo1);
1245 offset = BINFO_OFFSET (binfo);
1247 set_rtti_entry (BINFO_VIRTUALS (binfo),
1248 ssize_binop (MINUS_EXPR, integer_zero_node, offset),
1251 #ifdef GATHER_STATISTICS
1253 n_vtable_elems += list_length (BINFO_VIRTUALS (binfo));
1256 /* Set TREE_PUBLIC and TREE_EXTERN as appropriate. */
1257 import_export_vtable (new_decl, for_type, 0);
1259 if (TREE_VIA_VIRTUAL (binfo))
1260 my_friendly_assert (binfo == BINFO_FOR_VBASE (BINFO_TYPE (binfo),
1261 current_class_type),
1263 SET_BINFO_NEW_VTABLE_MARKED (binfo);
1267 /* Create a new vtable for BINFO which is the hierarchy dominated by
1271 make_new_vtable (t, binfo)
1275 if (binfo == TYPE_BINFO (t))
1276 /* In this case, it is *type*'s vtable we are modifying. We start
1277 with the approximation that it's vtable is that of the
1278 immediate base class. */
1279 return build_primary_vtable (TYPE_BINFO (DECL_CONTEXT (TYPE_VFIELD (t))),
1282 /* This is our very own copy of `basetype' to play with. Later,
1283 we will fill in all the virtual functions that override the
1284 virtual functions in these base classes which are not defined
1285 by the current type. */
1286 return build_secondary_vtable (binfo, t);
1289 /* Make *VIRTUALS, an entry on the BINFO_VIRTUALS list for BINFO
1290 (which is in the hierarchy dominated by T) list FNDECL as its
1291 BV_FN. DELTA is the required adjustment from the `this' pointer
1292 where the vtable entry appears to the `this' required when the
1293 function is actually called. */
1296 modify_vtable_entry (t, binfo, fndecl, delta, virtuals)
1307 vcall_index = integer_zero_node;
1309 if (fndecl != BV_FN (v)
1310 || !tree_int_cst_equal (delta, BV_DELTA (v))
1311 || !tree_int_cst_equal (vcall_index, BV_VCALL_INDEX (v)))
1315 /* We need a new vtable for BINFO. */
1316 if (make_new_vtable (t, binfo))
1318 /* If we really did make a new vtable, we also made a copy
1319 of the BINFO_VIRTUALS list. Now, we have to find the
1320 corresponding entry in that list. */
1321 *virtuals = BINFO_VIRTUALS (binfo);
1322 while (BV_FN (*virtuals) != BV_FN (v))
1323 *virtuals = TREE_CHAIN (*virtuals);
1327 base_fndecl = BV_FN (v);
1328 BV_DELTA (v) = delta;
1329 BV_VCALL_INDEX (v) = vcall_index;
1332 /* Now assign virtual dispatch information, if unset. We can
1333 dispatch this, through any overridden base function. */
1334 if (TREE_CODE (DECL_VINDEX (fndecl)) != INTEGER_CST)
1336 DECL_VINDEX (fndecl) = DECL_VINDEX (base_fndecl);
1337 DECL_VIRTUAL_CONTEXT (fndecl) = DECL_VIRTUAL_CONTEXT (base_fndecl);
1342 /* Call this function whenever its known that a vtable for T is going
1343 to be needed. It's safe to call it more than once. *HAS_VIRTUAL_P
1344 is initialized to the number of slots that are reserved at the
1345 beginning of the vtable for RTTI information. */
1348 start_vtable (t, has_virtual_p)
1352 if (*has_virtual_p == 0 && ! CLASSTYPE_COM_INTERFACE (t))
1354 /* If we are using thunks, use two slots at the front, one
1355 for the offset pointer, one for the tdesc pointer.
1356 For ARM-style vtables, use the same slot for both. */
1357 if (flag_vtable_thunks)
1364 /* Add a virtual function to all the appropriate vtables for the class
1365 T. DECL_VINDEX(X) should be error_mark_node, if we want to
1366 allocate a new slot in our table. If it is error_mark_node, we
1367 know that no other function from another vtable is overridden by X.
1368 HAS_VIRTUAL keeps track of how many virtuals there are in our main
1369 vtable for the type, and we build upon the NEW_VIRTUALS list
1373 add_virtual_function (new_virtuals_p, overridden_virtuals_p,
1374 has_virtual, fndecl, t)
1375 tree *new_virtuals_p;
1376 tree *overridden_virtuals_p;
1379 tree t; /* Structure type. */
1383 /* If this function doesn't override anything from a base class, we
1384 can just assign it a new DECL_VINDEX now. Otherwise, if it does
1385 override something, we keep it around and assign its DECL_VINDEX
1386 later, in modify_all_vtables. */
1387 if (TREE_CODE (DECL_VINDEX (fndecl)) == INTEGER_CST)
1388 /* We've already dealt with this function. */
1391 new_virtual = build_tree_list (integer_zero_node, fndecl);
1392 BV_VCALL_INDEX (new_virtual) = integer_zero_node;
1394 if (DECL_VINDEX (fndecl) == error_mark_node)
1396 /* FNDECL is a new virtual function; it doesn't override any
1397 virtual function in a base class. */
1399 /* We remember that this was the base sub-object for rtti. */
1400 CLASSTYPE_RTTI (t) = t;
1402 start_vtable (t, has_virtual);
1404 /* Now assign virtual dispatch information. */
1405 DECL_VINDEX (fndecl) = build_shared_int_cst ((*has_virtual)++);
1406 DECL_VIRTUAL_CONTEXT (fndecl) = t;
1408 /* Save the state we've computed on the NEW_VIRTUALS list. */
1409 TREE_CHAIN (new_virtual) = *new_virtuals_p;
1410 *new_virtuals_p = new_virtual;
1414 /* FNDECL overrides a function from a base class. */
1415 TREE_CHAIN (new_virtual) = *overridden_virtuals_p;
1416 *overridden_virtuals_p = new_virtual;
1420 extern struct obstack *current_obstack;
1422 /* Add method METHOD to class TYPE.
1424 If non-NULL, FIELDS is the entry in the METHOD_VEC vector entry of
1425 the class type where the method should be added. */
1428 add_method (type, fields, method)
1429 tree type, *fields, method;
1431 /* Setting the DECL_CONTEXT and DECL_VIRTUAL_CONTEXT
1432 here is probably redundant. */
1433 DECL_CONTEXT (method) = type;
1434 DECL_VIRTUAL_CONTEXT (method) = type;
1436 if (fields && *fields)
1437 *fields = build_overload (method, *fields);
1444 if (!CLASSTYPE_METHOD_VEC (type))
1445 /* Make a new method vector. We start with 8 entries. We must
1446 allocate at least two (for constructors and destructors), and
1447 we're going to end up with an assignment operator at some
1450 We could use a TREE_LIST for now, and convert it to a
1451 TREE_VEC in finish_struct, but we would probably waste more
1452 memory making the links in the list than we would by
1453 over-allocating the size of the vector here. Furthermore,
1454 we would complicate all the code that expects this to be a
1456 CLASSTYPE_METHOD_VEC (type) = make_tree_vec (8);
1458 method_vec = CLASSTYPE_METHOD_VEC (type);
1459 len = TREE_VEC_LENGTH (method_vec);
1461 if (DECL_NAME (method) == constructor_name (type))
1462 /* A new constructor or destructor. Constructors go in
1463 slot 0; destructors go in slot 1. */
1464 slot = DESTRUCTOR_NAME_P (DECL_ASSEMBLER_NAME (method)) ? 1 : 0;
1467 /* See if we already have an entry with this name. */
1468 for (slot = 2; slot < len; ++slot)
1469 if (!TREE_VEC_ELT (method_vec, slot)
1470 || (DECL_NAME (OVL_CURRENT (TREE_VEC_ELT (method_vec,
1472 == DECL_NAME (method)))
1477 /* We need a bigger method vector. */
1478 tree new_vec = make_tree_vec (2 * len);
1479 bcopy ((PTR) &TREE_VEC_ELT (method_vec, 0),
1480 (PTR) &TREE_VEC_ELT (new_vec, 0),
1481 len * sizeof (tree));
1483 method_vec = CLASSTYPE_METHOD_VEC (type) = new_vec;
1486 if (DECL_CONV_FN_P (method) && !TREE_VEC_ELT (method_vec, slot))
1488 /* Type conversion operators have to come before
1489 ordinary methods; add_conversions depends on this to
1490 speed up looking for conversion operators. So, if
1491 necessary, we slide some of the vector elements up.
1492 In theory, this makes this algorithm O(N^2) but we
1493 don't expect many conversion operators. */
1494 for (slot = 2; slot < len; ++slot)
1496 tree fn = TREE_VEC_ELT (method_vec, slot);
1499 /* There are no more entries in the vector, so we
1500 can insert the new conversion operator here. */
1503 if (!DECL_CONV_FN_P (OVL_CURRENT (fn)))
1504 /* We can insert the new function right at the
1509 if (!TREE_VEC_ELT (method_vec, slot))
1510 /* There is nothing in the Ith slot, so we can avoid
1515 /* We know the last slot in the vector is empty
1516 because we know that at this point there's room
1517 for a new function. */
1518 bcopy ((PTR) &TREE_VEC_ELT (method_vec, slot),
1519 (PTR) &TREE_VEC_ELT (method_vec, slot + 1),
1520 (len - slot - 1) * sizeof (tree));
1521 TREE_VEC_ELT (method_vec, slot) = NULL_TREE;
1526 if (template_class_depth (type))
1527 /* TYPE is a template class. Don't issue any errors now; wait
1528 until instantiation time to complain. */
1534 /* Check to see if we've already got this method. */
1535 for (fns = TREE_VEC_ELT (method_vec, slot);
1537 fns = OVL_NEXT (fns))
1539 tree fn = OVL_CURRENT (fns);
1541 if (TREE_CODE (fn) != TREE_CODE (method))
1544 if (TREE_CODE (method) != TEMPLATE_DECL)
1546 /* [over.load] Member function declarations with the
1547 same name and the same parameter types cannot be
1548 overloaded if any of them is a static member
1549 function declaration. */
1550 if (DECL_STATIC_FUNCTION_P (fn)
1551 != DECL_STATIC_FUNCTION_P (method))
1553 tree parms1 = TYPE_ARG_TYPES (TREE_TYPE (fn));
1554 tree parms2 = TYPE_ARG_TYPES (TREE_TYPE (method));
1556 if (! DECL_STATIC_FUNCTION_P (fn))
1557 parms1 = TREE_CHAIN (parms1);
1559 parms2 = TREE_CHAIN (parms2);
1561 if (compparms (parms1, parms2))
1562 cp_error ("`%#D' and `%#D' cannot be overloaded",
1566 /* Since this is an ordinary function in a
1567 non-template class, it's mangled name can be used
1568 as a unique identifier. This technique is only
1569 an optimization; we would get the same results if
1570 we just used decls_match here. */
1571 if (DECL_ASSEMBLER_NAME (fn)
1572 != DECL_ASSEMBLER_NAME (method))
1575 else if (!decls_match (fn, method))
1578 /* There has already been a declaration of this method
1579 or member template. */
1580 cp_error_at ("`%D' has already been declared in `%T'",
1583 /* We don't call duplicate_decls here to merge the
1584 declarations because that will confuse things if the
1585 methods have inline definitions. In particular, we
1586 will crash while processing the definitions. */
1591 /* Actually insert the new method. */
1592 TREE_VEC_ELT (method_vec, slot)
1593 = build_overload (method, TREE_VEC_ELT (method_vec, slot));
1595 /* Add the new binding. */
1596 if (!DECL_CONSTRUCTOR_P (method)
1597 && !DECL_DESTRUCTOR_P (method))
1598 push_class_level_binding (DECL_NAME (method),
1599 TREE_VEC_ELT (method_vec, slot));
1603 /* Subroutines of finish_struct. */
1605 /* Look through the list of fields for this struct, deleting
1606 duplicates as we go. This must be recursive to handle
1609 FIELD is the field which may not appear anywhere in FIELDS.
1610 FIELD_PTR, if non-null, is the starting point at which
1611 chained deletions may take place.
1612 The value returned is the first acceptable entry found
1615 Note that anonymous fields which are not of UNION_TYPE are
1616 not duplicates, they are just anonymous fields. This happens
1617 when we have unnamed bitfields, for example. */
1620 delete_duplicate_fields_1 (field, fields)
1625 if (DECL_NAME (field) == 0)
1627 if (! ANON_AGGR_TYPE_P (TREE_TYPE (field)))
1630 for (x = TYPE_FIELDS (TREE_TYPE (field)); x; x = TREE_CHAIN (x))
1631 fields = delete_duplicate_fields_1 (x, fields);
1636 for (x = fields; x; prev = x, x = TREE_CHAIN (x))
1638 if (DECL_NAME (x) == 0)
1640 if (! ANON_AGGR_TYPE_P (TREE_TYPE (x)))
1642 TYPE_FIELDS (TREE_TYPE (x))
1643 = delete_duplicate_fields_1 (field, TYPE_FIELDS (TREE_TYPE (x)));
1644 if (TYPE_FIELDS (TREE_TYPE (x)) == 0)
1647 fields = TREE_CHAIN (fields);
1649 TREE_CHAIN (prev) = TREE_CHAIN (x);
1652 else if (TREE_CODE (field) == USING_DECL)
1653 /* A using declaration may is allowed to appear more than
1654 once. We'll prune these from the field list later, and
1655 handle_using_decl will complain about invalid multiple
1658 else if (DECL_NAME (field) == DECL_NAME (x))
1660 if (TREE_CODE (field) == CONST_DECL
1661 && TREE_CODE (x) == CONST_DECL)
1662 cp_error_at ("duplicate enum value `%D'", x);
1663 else if (TREE_CODE (field) == CONST_DECL
1664 || TREE_CODE (x) == CONST_DECL)
1665 cp_error_at ("duplicate field `%D' (as enum and non-enum)",
1667 else if (DECL_DECLARES_TYPE_P (field)
1668 && DECL_DECLARES_TYPE_P (x))
1670 if (same_type_p (TREE_TYPE (field), TREE_TYPE (x)))
1672 cp_error_at ("duplicate nested type `%D'", x);
1674 else if (DECL_DECLARES_TYPE_P (field)
1675 || DECL_DECLARES_TYPE_P (x))
1677 /* Hide tag decls. */
1678 if ((TREE_CODE (field) == TYPE_DECL
1679 && DECL_ARTIFICIAL (field))
1680 || (TREE_CODE (x) == TYPE_DECL
1681 && DECL_ARTIFICIAL (x)))
1683 cp_error_at ("duplicate field `%D' (as type and non-type)",
1687 cp_error_at ("duplicate member `%D'", x);
1689 fields = TREE_CHAIN (fields);
1691 TREE_CHAIN (prev) = TREE_CHAIN (x);
1699 delete_duplicate_fields (fields)
1703 for (x = fields; x && TREE_CHAIN (x); x = TREE_CHAIN (x))
1704 TREE_CHAIN (x) = delete_duplicate_fields_1 (x, TREE_CHAIN (x));
1707 /* Change the access of FDECL to ACCESS in T. The access to FDECL is
1708 along the path given by BINFO. Return 1 if change was legit,
1709 otherwise return 0. */
1712 alter_access (t, binfo, fdecl, access)
1718 tree elem = purpose_member (t, DECL_ACCESS (fdecl));
1721 if (TREE_VALUE (elem) != access)
1723 if (TREE_CODE (TREE_TYPE (fdecl)) == FUNCTION_DECL)
1724 cp_error_at ("conflicting access specifications for method `%D', ignored", TREE_TYPE (fdecl));
1726 error ("conflicting access specifications for field `%s', ignored",
1727 IDENTIFIER_POINTER (DECL_NAME (fdecl)));
1731 /* They're changing the access to the same thing they changed
1732 it to before. That's OK. */
1738 enforce_access (binfo, fdecl);
1739 DECL_ACCESS (fdecl) = tree_cons (t, access, DECL_ACCESS (fdecl));
1745 /* Process the USING_DECL, which is a member of T. */
1748 handle_using_decl (using_decl, t)
1752 tree ctype = DECL_INITIAL (using_decl);
1753 tree name = DECL_NAME (using_decl);
1755 = TREE_PRIVATE (using_decl) ? access_private_node
1756 : TREE_PROTECTED (using_decl) ? access_protected_node
1757 : access_public_node;
1759 tree flist = NULL_TREE;
1760 tree fields = TYPE_FIELDS (t);
1761 tree method_vec = CLASSTYPE_METHOD_VEC (t);
1766 binfo = binfo_or_else (ctype, t);
1770 if (name == constructor_name (ctype)
1771 || name == constructor_name_full (ctype))
1773 cp_error_at ("using-declaration for constructor", using_decl);
1777 fdecl = lookup_member (binfo, name, 0, 0);
1781 cp_error_at ("no members matching `%D' in `%#T'", using_decl, ctype);
1785 /* Functions are represented as TREE_LIST, with the purpose
1786 being the type and the value the functions. Other members
1787 come as themselves. */
1788 if (TREE_CODE (fdecl) == TREE_LIST)
1789 /* Ignore base type this came from. */
1790 fdecl = TREE_VALUE (fdecl);
1792 if (TREE_CODE (fdecl) == OVERLOAD)
1794 /* We later iterate over all functions. */
1796 fdecl = OVL_FUNCTION (flist);
1799 name = DECL_NAME (fdecl);
1800 n_methods = method_vec ? TREE_VEC_LENGTH (method_vec) : 0;
1801 for (i = 2; i < n_methods && TREE_VEC_ELT (method_vec, i); i++)
1802 if (DECL_NAME (OVL_CURRENT (TREE_VEC_ELT (method_vec, i)))
1805 cp_error ("cannot adjust access to `%#D' in `%#T'", fdecl, t);
1806 cp_error_at (" because of local method `%#D' with same name",
1807 OVL_CURRENT (TREE_VEC_ELT (method_vec, i)));
1811 if (! DECL_LANG_SPECIFIC (fdecl))
1812 /* We don't currently handle DECL_ACCESS for TYPE_DECLs; just return. */
1815 for (tmp = fields; tmp; tmp = TREE_CHAIN (tmp))
1816 if (DECL_NAME (tmp) == name)
1818 cp_error ("cannot adjust access to `%#D' in `%#T'", fdecl, t);
1819 cp_error_at (" because of local field `%#D' with same name", tmp);
1823 /* Make type T see field decl FDECL with access ACCESS.*/
1828 if (alter_access (t, binfo, OVL_FUNCTION (flist),
1831 flist = OVL_CHAIN (flist);
1835 alter_access (t, binfo, fdecl, access);
1838 /* Run through the base clases of T, updating
1839 CANT_HAVE_DEFAULT_CTOR_P, CANT_HAVE_CONST_CTOR_P, and
1840 NO_CONST_ASN_REF_P. Also set flag bits in T based on properties of
1844 check_bases (t, cant_have_default_ctor_p, cant_have_const_ctor_p,
1847 int *cant_have_default_ctor_p;
1848 int *cant_have_const_ctor_p;
1849 int *no_const_asn_ref_p;
1853 int seen_nearly_empty_base_p;
1856 binfos = TYPE_BINFO_BASETYPES (t);
1857 n_baseclasses = CLASSTYPE_N_BASECLASSES (t);
1858 seen_nearly_empty_base_p = 0;
1860 /* An aggregate cannot have baseclasses. */
1861 CLASSTYPE_NON_AGGREGATE (t) |= (n_baseclasses != 0);
1863 for (i = 0; i < n_baseclasses; ++i)
1868 /* Figure out what base we're looking at. */
1869 base_binfo = TREE_VEC_ELT (binfos, i);
1870 basetype = TREE_TYPE (base_binfo);
1872 /* If the type of basetype is incomplete, then we already
1873 complained about that fact (and we should have fixed it up as
1875 if (TYPE_SIZE (basetype) == 0)
1878 /* The base type is of incomplete type. It is
1879 probably best to pretend that it does not
1881 if (i == n_baseclasses-1)
1882 TREE_VEC_ELT (binfos, i) = NULL_TREE;
1883 TREE_VEC_LENGTH (binfos) -= 1;
1885 for (j = i; j+1 < n_baseclasses; j++)
1886 TREE_VEC_ELT (binfos, j) = TREE_VEC_ELT (binfos, j+1);
1890 /* Effective C++ rule 14. We only need to check TYPE_POLYMORPHIC_P
1891 here because the case of virtual functions but non-virtual
1892 dtor is handled in finish_struct_1. */
1893 if (warn_ecpp && ! TYPE_POLYMORPHIC_P (basetype)
1894 && TYPE_HAS_DESTRUCTOR (basetype))
1895 cp_warning ("base class `%#T' has a non-virtual destructor",
1898 /* If the base class doesn't have copy constructors or
1899 assignment operators that take const references, then the
1900 derived class cannot have such a member automatically
1902 if (! TYPE_HAS_CONST_INIT_REF (basetype))
1903 *cant_have_const_ctor_p = 1;
1904 if (TYPE_HAS_ASSIGN_REF (basetype)
1905 && !TYPE_HAS_CONST_ASSIGN_REF (basetype))
1906 *no_const_asn_ref_p = 1;
1907 /* Similarly, if the base class doesn't have a default
1908 constructor, then the derived class won't have an
1909 automatically generated default constructor. */
1910 if (TYPE_HAS_CONSTRUCTOR (basetype)
1911 && ! TYPE_HAS_DEFAULT_CONSTRUCTOR (basetype))
1913 *cant_have_default_ctor_p = 1;
1914 if (! TYPE_HAS_CONSTRUCTOR (t))
1916 cp_pedwarn ("base `%T' with only non-default constructor",
1918 cp_pedwarn ("in class without a constructor");
1922 /* If the base class is not empty or nearly empty, then this
1923 class cannot be nearly empty. */
1924 if (!CLASSTYPE_NEARLY_EMPTY_P (basetype) && !is_empty_class (basetype))
1925 CLASSTYPE_NEARLY_EMPTY_P (t) = 0;
1926 /* And if there is more than one nearly empty base, then the
1927 derived class is not nearly empty either. */
1928 else if (CLASSTYPE_NEARLY_EMPTY_P (basetype)
1929 && seen_nearly_empty_base_p)
1930 CLASSTYPE_NEARLY_EMPTY_P (t) = 0;
1931 /* If this is the first nearly empty base class, then remember
1933 else if (CLASSTYPE_NEARLY_EMPTY_P (basetype))
1934 seen_nearly_empty_base_p = 1;
1936 /* A lot of properties from the bases also apply to the derived
1938 TYPE_NEEDS_CONSTRUCTING (t) |= TYPE_NEEDS_CONSTRUCTING (basetype);
1939 TYPE_NEEDS_DESTRUCTOR (t) |= TYPE_NEEDS_DESTRUCTOR (basetype);
1940 TYPE_HAS_COMPLEX_ASSIGN_REF (t)
1941 |= TYPE_HAS_COMPLEX_ASSIGN_REF (basetype);
1942 TYPE_HAS_COMPLEX_INIT_REF (t) |= TYPE_HAS_COMPLEX_INIT_REF (basetype);
1943 TYPE_OVERLOADS_CALL_EXPR (t) |= TYPE_OVERLOADS_CALL_EXPR (basetype);
1944 TYPE_OVERLOADS_ARRAY_REF (t) |= TYPE_OVERLOADS_ARRAY_REF (basetype);
1945 TYPE_OVERLOADS_ARROW (t) |= TYPE_OVERLOADS_ARROW (basetype);
1946 TYPE_POLYMORPHIC_P (t) |= TYPE_POLYMORPHIC_P (basetype);
1948 /* Derived classes can implicitly become COMified if their bases
1950 if (CLASSTYPE_COM_INTERFACE (basetype))
1951 CLASSTYPE_COM_INTERFACE (t) = 1;
1952 else if (i == 0 && CLASSTYPE_COM_INTERFACE (t))
1955 ("COM interface type `%T' with non-COM leftmost base class `%T'",
1957 CLASSTYPE_COM_INTERFACE (t) = 0;
1962 /* Make the Ith baseclass of T its primary base. */
1965 set_primary_base (t, i, has_virtual_p)
1972 CLASSTYPE_VFIELD_PARENT (t) = i;
1973 basetype = BINFO_TYPE (CLASSTYPE_PRIMARY_BINFO (t));
1974 TYPE_BINFO_VTABLE (t) = TYPE_BINFO_VTABLE (basetype);
1975 TYPE_BINFO_VIRTUALS (t) = TYPE_BINFO_VIRTUALS (basetype);
1976 TYPE_VFIELD (t) = TYPE_VFIELD (basetype);
1977 CLASSTYPE_RTTI (t) = CLASSTYPE_RTTI (basetype);
1978 *has_virtual_p = CLASSTYPE_VSIZE (basetype);
1981 /* Determine the primary class for T. */
1984 determine_primary_base (t, has_virtual_p)
1988 int i, n_baseclasses = CLASSTYPE_N_BASECLASSES (t);
1990 /* If there are no baseclasses, there is certainly no primary base. */
1991 if (n_baseclasses == 0)
1996 for (i = 0; i < n_baseclasses; i++)
1998 tree base_binfo = TREE_VEC_ELT (TYPE_BINFO_BASETYPES (t), i);
1999 tree basetype = BINFO_TYPE (base_binfo);
2001 if (TYPE_CONTAINS_VPTR_P (basetype))
2003 /* Even a virtual baseclass can contain our RTTI
2004 information. But, we prefer a non-virtual polymorphic
2006 if (!CLASSTYPE_HAS_PRIMARY_BASE_P (t))
2007 CLASSTYPE_RTTI (t) = CLASSTYPE_RTTI (basetype);
2009 /* A virtual baseclass can't be the primary base under the
2010 old ABI. And under the new ABI we still prefer a
2011 non-virtual base. */
2012 if (TREE_VIA_VIRTUAL (base_binfo))
2015 if (!CLASSTYPE_HAS_PRIMARY_BASE_P (t))
2017 set_primary_base (t, i, has_virtual_p);
2018 CLASSTYPE_VFIELDS (t) = copy_list (CLASSTYPE_VFIELDS (basetype));
2024 /* Only add unique vfields, and flatten them out as we go. */
2025 for (vfields = CLASSTYPE_VFIELDS (basetype);
2027 vfields = TREE_CHAIN (vfields))
2028 if (VF_BINFO_VALUE (vfields) == NULL_TREE
2029 || ! TREE_VIA_VIRTUAL (VF_BINFO_VALUE (vfields)))
2030 CLASSTYPE_VFIELDS (t)
2031 = tree_cons (base_binfo,
2032 VF_BASETYPE_VALUE (vfields),
2033 CLASSTYPE_VFIELDS (t));
2035 if (*has_virtual_p == 0)
2036 set_primary_base (t, i, has_virtual_p);
2041 if (!TYPE_VFIELD (t))
2042 CLASSTYPE_VFIELD_PARENT (t) = -1;
2044 /* The new ABI allows for the use of a "nearly-empty" virtual base
2045 class as the primary base class if no non-virtual polymorphic
2046 base can be found. */
2047 if (flag_new_abi && !CLASSTYPE_HAS_PRIMARY_BASE_P (t))
2048 for (i = 0; i < n_baseclasses; ++i)
2050 tree base_binfo = TREE_VEC_ELT (TYPE_BINFO_BASETYPES (t), i);
2051 tree basetype = BINFO_TYPE (base_binfo);
2053 if (TREE_VIA_VIRTUAL (base_binfo)
2054 && CLASSTYPE_NEARLY_EMPTY_P (basetype))
2056 set_primary_base (t, i, has_virtual_p);
2057 CLASSTYPE_VFIELDS (t) = copy_list (CLASSTYPE_VFIELDS (basetype));
2062 /* Mark the primary base classes at this point. */
2063 mark_primary_bases (t);
2066 /* Set memoizing fields and bits of T (and its variants) for later
2070 finish_struct_bits (t)
2073 int i, n_baseclasses = CLASSTYPE_N_BASECLASSES (t);
2075 /* Fix up variants (if any). */
2076 tree variants = TYPE_NEXT_VARIANT (t);
2079 /* These fields are in the _TYPE part of the node, not in
2080 the TYPE_LANG_SPECIFIC component, so they are not shared. */
2081 TYPE_HAS_CONSTRUCTOR (variants) = TYPE_HAS_CONSTRUCTOR (t);
2082 TYPE_HAS_DESTRUCTOR (variants) = TYPE_HAS_DESTRUCTOR (t);
2083 TYPE_NEEDS_CONSTRUCTING (variants) = TYPE_NEEDS_CONSTRUCTING (t);
2084 TYPE_NEEDS_DESTRUCTOR (variants) = TYPE_NEEDS_DESTRUCTOR (t);
2086 TYPE_BASE_CONVS_MAY_REQUIRE_CODE_P (variants)
2087 = TYPE_BASE_CONVS_MAY_REQUIRE_CODE_P (t);
2088 TYPE_POLYMORPHIC_P (variants) = TYPE_POLYMORPHIC_P (t);
2089 TYPE_USES_VIRTUAL_BASECLASSES (variants) = TYPE_USES_VIRTUAL_BASECLASSES (t);
2090 /* Copy whatever these are holding today. */
2091 TYPE_MIN_VALUE (variants) = TYPE_MIN_VALUE (t);
2092 TYPE_MAX_VALUE (variants) = TYPE_MAX_VALUE (t);
2093 TYPE_FIELDS (variants) = TYPE_FIELDS (t);
2094 TYPE_SIZE (variants) = TYPE_SIZE (t);
2095 TYPE_SIZE_UNIT (variants) = TYPE_SIZE_UNIT (t);
2096 variants = TYPE_NEXT_VARIANT (variants);
2099 if (n_baseclasses && TYPE_POLYMORPHIC_P (t))
2100 /* For a class w/o baseclasses, `finish_struct' has set
2101 CLASS_TYPE_ABSTRACT_VIRTUALS correctly (by
2102 definition). Similarly for a class whose base classes do not
2103 have vtables. When neither of these is true, we might have
2104 removed abstract virtuals (by providing a definition), added
2105 some (by declaring new ones), or redeclared ones from a base
2106 class. We need to recalculate what's really an abstract virtual
2107 at this point (by looking in the vtables). */
2108 get_pure_virtuals (t);
2112 /* Notice whether this class has type conversion functions defined. */
2113 tree binfo = TYPE_BINFO (t);
2114 tree binfos = BINFO_BASETYPES (binfo);
2117 for (i = n_baseclasses-1; i >= 0; i--)
2119 basetype = BINFO_TYPE (TREE_VEC_ELT (binfos, i));
2121 TYPE_HAS_CONVERSION (t) |= TYPE_HAS_CONVERSION (basetype);
2125 /* If this type has a copy constructor, force its mode to be BLKmode, and
2126 force its TREE_ADDRESSABLE bit to be nonzero. This will cause it to
2127 be passed by invisible reference and prevent it from being returned in
2130 Also do this if the class has BLKmode but can still be returned in
2131 registers, since function_cannot_inline_p won't let us inline
2132 functions returning such a type. This affects the HP-PA. */
2133 if (! TYPE_HAS_TRIVIAL_INIT_REF (t)
2134 || (TYPE_MODE (t) == BLKmode && ! aggregate_value_p (t)
2135 && CLASSTYPE_NON_AGGREGATE (t)))
2138 DECL_MODE (TYPE_MAIN_DECL (t)) = BLKmode;
2139 for (variants = t; variants; variants = TYPE_NEXT_VARIANT (variants))
2141 TYPE_MODE (variants) = BLKmode;
2142 TREE_ADDRESSABLE (variants) = 1;
2147 /* Issue warnings about T having private constructors, but no friends,
2150 HAS_NONPRIVATE_METHOD is nonzero if T has any non-private methods or
2151 static members. HAS_NONPRIVATE_STATIC_FN is nonzero if T has any
2152 non-private static member functions. */
2155 maybe_warn_about_overly_private_class (t)
2158 int has_member_fn = 0;
2159 int has_nonprivate_method = 0;
2162 if (!warn_ctor_dtor_privacy
2163 /* If the class has friends, those entities might create and
2164 access instances, so we should not warn. */
2165 || (CLASSTYPE_FRIEND_CLASSES (t)
2166 || DECL_FRIENDLIST (TYPE_MAIN_DECL (t)))
2167 /* We will have warned when the template was declared; there's
2168 no need to warn on every instantiation. */
2169 || CLASSTYPE_TEMPLATE_INSTANTIATION (t))
2170 /* There's no reason to even consider warning about this
2174 /* We only issue one warning, if more than one applies, because
2175 otherwise, on code like:
2178 // Oops - forgot `public:'
2184 we warn several times about essentially the same problem. */
2186 /* Check to see if all (non-constructor, non-destructor) member
2187 functions are private. (Since there are no friends or
2188 non-private statics, we can't ever call any of the private member
2190 for (fn = TYPE_METHODS (t); fn; fn = TREE_CHAIN (fn))
2191 /* We're not interested in compiler-generated methods; they don't
2192 provide any way to call private members. */
2193 if (!DECL_ARTIFICIAL (fn))
2195 if (!TREE_PRIVATE (fn))
2197 if (DECL_STATIC_FUNCTION_P (fn))
2198 /* A non-private static member function is just like a
2199 friend; it can create and invoke private member
2200 functions, and be accessed without a class
2204 has_nonprivate_method = 1;
2207 else if (!DECL_CONSTRUCTOR_P (fn) && !DECL_DESTRUCTOR_P (fn))
2211 if (!has_nonprivate_method && has_member_fn)
2213 /* There are no non-private methods, and there's at least one
2214 private member function that isn't a constructor or
2215 destructor. (If all the private members are
2216 constructors/destructors we want to use the code below that
2217 issues error messages specifically referring to
2218 constructors/destructors.) */
2220 tree binfos = BINFO_BASETYPES (TYPE_BINFO (t));
2221 for (i = 0; i < CLASSTYPE_N_BASECLASSES (t); i++)
2222 if (TREE_VIA_PUBLIC (TREE_VEC_ELT (binfos, i))
2223 || TREE_VIA_PROTECTED (TREE_VEC_ELT (binfos, i)))
2225 has_nonprivate_method = 1;
2228 if (!has_nonprivate_method)
2230 cp_warning ("all member functions in class `%T' are private", t);
2235 /* Even if some of the member functions are non-private, the class
2236 won't be useful for much if all the constructors or destructors
2237 are private: such an object can never be created or destroyed. */
2238 if (TYPE_HAS_DESTRUCTOR (t))
2240 tree dtor = TREE_VEC_ELT (CLASSTYPE_METHOD_VEC (t), 1);
2242 if (TREE_PRIVATE (dtor))
2244 cp_warning ("`%#T' only defines a private destructor and has no friends",
2250 if (TYPE_HAS_CONSTRUCTOR (t))
2252 int nonprivate_ctor = 0;
2254 /* If a non-template class does not define a copy
2255 constructor, one is defined for it, enabling it to avoid
2256 this warning. For a template class, this does not
2257 happen, and so we would normally get a warning on:
2259 template <class T> class C { private: C(); };
2261 To avoid this asymmetry, we check TYPE_HAS_INIT_REF. All
2262 complete non-template or fully instantiated classes have this
2264 if (!TYPE_HAS_INIT_REF (t))
2265 nonprivate_ctor = 1;
2267 for (fn = TREE_VEC_ELT (CLASSTYPE_METHOD_VEC (t), 0);
2271 tree ctor = OVL_CURRENT (fn);
2272 /* Ideally, we wouldn't count copy constructors (or, in
2273 fact, any constructor that takes an argument of the
2274 class type as a parameter) because such things cannot
2275 be used to construct an instance of the class unless
2276 you already have one. But, for now at least, we're
2278 if (! TREE_PRIVATE (ctor))
2280 nonprivate_ctor = 1;
2285 if (nonprivate_ctor == 0)
2287 cp_warning ("`%#T' only defines private constructors and has no friends",
2294 /* Function to help qsort sort FIELD_DECLs by name order. */
2297 field_decl_cmp (x, y)
2300 if (DECL_NAME (*x) == DECL_NAME (*y))
2301 /* A nontype is "greater" than a type. */
2302 return DECL_DECLARES_TYPE_P (*y) - DECL_DECLARES_TYPE_P (*x);
2303 if (DECL_NAME (*x) == NULL_TREE)
2305 if (DECL_NAME (*y) == NULL_TREE)
2307 if (DECL_NAME (*x) < DECL_NAME (*y))
2312 /* Comparison function to compare two TYPE_METHOD_VEC entries by name. */
2315 method_name_cmp (m1, m2)
2316 const tree *m1, *m2;
2318 if (*m1 == NULL_TREE && *m2 == NULL_TREE)
2320 if (*m1 == NULL_TREE)
2322 if (*m2 == NULL_TREE)
2324 if (DECL_NAME (OVL_CURRENT (*m1)) < DECL_NAME (OVL_CURRENT (*m2)))
2329 /* Warn about duplicate methods in fn_fields. Also compact method
2330 lists so that lookup can be made faster.
2332 Data Structure: List of method lists. The outer list is a
2333 TREE_LIST, whose TREE_PURPOSE field is the field name and the
2334 TREE_VALUE is the DECL_CHAIN of the FUNCTION_DECLs. TREE_CHAIN
2335 links the entire list of methods for TYPE_METHODS. Friends are
2336 chained in the same way as member functions (? TREE_CHAIN or
2337 DECL_CHAIN), but they live in the TREE_TYPE field of the outer
2338 list. That allows them to be quickly deleted, and requires no
2341 If there are any constructors/destructors, they are moved to the
2342 front of the list. This makes pushclass more efficient.
2344 @@ The above comment is obsolete. It mostly describes what add_method
2345 @@ and add_implicitly_declared_members do.
2347 Sort methods that are not special (i.e., constructors, destructors, and
2348 type conversion operators) so that we can find them faster in search. */
2351 finish_struct_methods (t)
2356 tree ctor_name = constructor_name (t);
2359 if (!TYPE_METHODS (t))
2361 /* Clear these for safety; perhaps some parsing error could set
2362 these incorrectly. */
2363 TYPE_HAS_CONSTRUCTOR (t) = 0;
2364 TYPE_HAS_DESTRUCTOR (t) = 0;
2365 CLASSTYPE_METHOD_VEC (t) = NULL_TREE;
2369 method_vec = CLASSTYPE_METHOD_VEC (t);
2370 my_friendly_assert (method_vec != NULL_TREE, 19991215);
2371 len = TREE_VEC_LENGTH (method_vec);
2373 /* First fill in entry 0 with the constructors, entry 1 with destructors,
2374 and the next few with type conversion operators (if any). */
2375 for (fn_fields = TYPE_METHODS (t); fn_fields;
2376 fn_fields = TREE_CHAIN (fn_fields))
2378 tree fn_name = DECL_NAME (fn_fields);
2380 /* Clear out this flag.
2382 @@ Doug may figure out how to break
2383 @@ this with nested classes and friends. */
2384 DECL_IN_AGGR_P (fn_fields) = 0;
2386 /* Note here that a copy ctor is private, so we don't dare generate
2387 a default copy constructor for a class that has a member
2388 of this type without making sure they have access to it. */
2389 if (fn_name == ctor_name)
2391 tree parmtypes = FUNCTION_ARG_CHAIN (fn_fields);
2392 tree parmtype = parmtypes ? TREE_VALUE (parmtypes) : void_type_node;
2394 if (TREE_CODE (parmtype) == REFERENCE_TYPE
2395 && TYPE_MAIN_VARIANT (TREE_TYPE (parmtype)) == t)
2397 if (TREE_CHAIN (parmtypes) == NULL_TREE
2398 || TREE_CHAIN (parmtypes) == void_list_node
2399 || TREE_PURPOSE (TREE_CHAIN (parmtypes)))
2401 if (TREE_PROTECTED (fn_fields))
2402 TYPE_HAS_NONPUBLIC_CTOR (t) = 1;
2403 else if (TREE_PRIVATE (fn_fields))
2404 TYPE_HAS_NONPUBLIC_CTOR (t) = 2;
2408 else if (fn_name == ansi_opname[(int) MODIFY_EXPR])
2410 tree parmtype = TREE_VALUE (FUNCTION_ARG_CHAIN (fn_fields));
2412 if (copy_assignment_arg_p (parmtype, DECL_VIRTUAL_P (fn_fields)))
2414 if (TREE_PROTECTED (fn_fields))
2415 TYPE_HAS_NONPUBLIC_ASSIGN_REF (t) = 1;
2416 else if (TREE_PRIVATE (fn_fields))
2417 TYPE_HAS_NONPUBLIC_ASSIGN_REF (t) = 2;
2422 if (TYPE_HAS_DESTRUCTOR (t) && !TREE_VEC_ELT (method_vec, 1))
2423 /* We thought there was a destructor, but there wasn't. Some
2424 parse errors cause this anomalous situation. */
2425 TYPE_HAS_DESTRUCTOR (t) = 0;
2427 /* Issue warnings about private constructors and such. If there are
2428 no methods, then some public defaults are generated. */
2429 maybe_warn_about_overly_private_class (t);
2431 /* Now sort the methods. */
2432 while (len > 2 && TREE_VEC_ELT (method_vec, len-1) == NULL_TREE)
2434 TREE_VEC_LENGTH (method_vec) = len;
2436 /* The type conversion ops have to live at the front of the vec, so we
2438 for (slot = 2; slot < len; ++slot)
2440 tree fn = TREE_VEC_ELT (method_vec, slot);
2442 if (!DECL_CONV_FN_P (OVL_CURRENT (fn)))
2446 qsort (&TREE_VEC_ELT (method_vec, slot), len-slot, sizeof (tree),
2447 (int (*)(const void *, const void *))method_name_cmp);
2450 /* Emit error when a duplicate definition of a type is seen. Patch up. */
2453 duplicate_tag_error (t)
2456 cp_error ("redefinition of `%#T'", t);
2457 cp_error_at ("previous definition here", t);
2459 /* Pretend we haven't defined this type. */
2461 /* All of the component_decl's were TREE_CHAINed together in the parser.
2462 finish_struct_methods walks these chains and assembles all methods with
2463 the same base name into DECL_CHAINs. Now we don't need the parser chains
2464 anymore, so we unravel them. */
2466 /* This used to be in finish_struct, but it turns out that the
2467 TREE_CHAIN is used by dbxout_type_methods and perhaps some other
2469 if (CLASSTYPE_METHOD_VEC (t))
2471 tree method_vec = CLASSTYPE_METHOD_VEC (t);
2472 int i, len = TREE_VEC_LENGTH (method_vec);
2473 for (i = 0; i < len; i++)
2475 tree unchain = TREE_VEC_ELT (method_vec, i);
2476 while (unchain != NULL_TREE)
2478 TREE_CHAIN (OVL_CURRENT (unchain)) = NULL_TREE;
2479 unchain = OVL_NEXT (unchain);
2484 if (TYPE_LANG_SPECIFIC (t))
2486 tree binfo = TYPE_BINFO (t);
2487 int interface_only = CLASSTYPE_INTERFACE_ONLY (t);
2488 int interface_unknown = CLASSTYPE_INTERFACE_UNKNOWN (t);
2489 tree template_info = CLASSTYPE_TEMPLATE_INFO (t);
2490 int use_template = CLASSTYPE_USE_TEMPLATE (t);
2492 bzero ((char *) TYPE_LANG_SPECIFIC (t), sizeof (struct lang_type));
2493 BINFO_BASETYPES(binfo) = NULL_TREE;
2495 TYPE_BINFO (t) = binfo;
2496 CLASSTYPE_INTERFACE_ONLY (t) = interface_only;
2497 SET_CLASSTYPE_INTERFACE_UNKNOWN_X (t, interface_unknown);
2498 TYPE_REDEFINED (t) = 1;
2499 CLASSTYPE_TEMPLATE_INFO (t) = template_info;
2500 CLASSTYPE_USE_TEMPLATE (t) = use_template;
2502 TYPE_SIZE (t) = NULL_TREE;
2503 TYPE_MODE (t) = VOIDmode;
2504 TYPE_FIELDS (t) = NULL_TREE;
2505 TYPE_METHODS (t) = NULL_TREE;
2506 TYPE_VFIELD (t) = NULL_TREE;
2507 TYPE_CONTEXT (t) = NULL_TREE;
2508 TYPE_NONCOPIED_PARTS (t) = NULL_TREE;
2511 /* Make the BINFO's vtablehave N entries, including RTTI entries, but
2512 not including vbase and vcall offsets. Set its type and call the
2513 backend to lay it out. */
2516 layout_vtable_decl (binfo, n)
2523 itype = size_int (n);
2524 itype = size_binop (PLUS_EXPR,
2526 num_extra_vtbl_entries (binfo));
2527 atype = build_cplus_array_type (vtable_entry_type,
2528 build_index_type (itype));
2529 layout_type (atype);
2531 /* We may have to grow the vtable. */
2532 if (!same_type_p (TREE_TYPE (BINFO_VTABLE (binfo)), atype))
2534 TREE_TYPE (BINFO_VTABLE (binfo)) = atype;
2535 DECL_SIZE (BINFO_VTABLE (binfo)) = 0;
2536 layout_decl (BINFO_VTABLE (binfo), 0);
2537 /* At one time the vtable info was grabbed 2 words at a time. This
2538 fails on sparc unless you have 8-byte alignment. (tiemann) */
2539 DECL_ALIGN (BINFO_VTABLE (binfo))
2540 = MAX (TYPE_ALIGN (double_type_node),
2541 DECL_ALIGN (BINFO_VTABLE (binfo)));
2545 /* Returns the number of virtual function table entries (excluding
2546 RTTI information, vbase and vcall offests, etc.) in the vtable for
2550 num_vfun_entries (binfo)
2553 return list_length (skip_rtti_stuff (binfo,
2558 /* Called from num_extra_vtbl_entries via dfs_walk. */
2561 dfs_count_virtuals (binfo, data)
2565 /* Non-primary bases are not interesting; all of the virtual
2566 function table entries have been overridden. */
2567 if (!BINFO_PRIMARY_MARKED_P (binfo))
2568 ((vcall_offset_data *) data)->offsets += num_vfun_entries (binfo);
2573 /* Returns the number of extra entries (at negative indices) required
2574 for BINFO's vtable. */
2577 num_extra_vtbl_entries (binfo)
2583 type = BINFO_TYPE (binfo);
2586 /* There is an entry for the offset to each virtual base. */
2587 if (vbase_offsets_in_vtable_p ())
2588 entries += list_length (CLASSTYPE_VBASECLASSES (type));
2590 /* If this is a virtual base, there are entries for each virtual
2591 function defined in this class or its bases. */
2592 if (vcall_offsets_in_vtable_p () && TREE_VIA_VIRTUAL (binfo))
2594 vcall_offset_data vod;
2600 dfs_vcall_offset_queue_p,
2602 entries += vod.offsets;
2605 return entries ? size_int (entries) : size_zero_node;
2608 /* Returns the offset (in bytes) from the beginning of BINFO's vtable
2609 where the vptr should actually point. */
2612 size_extra_vtbl_entries (binfo)
2617 offset = size_binop (EXACT_DIV_EXPR,
2618 TYPE_SIZE (vtable_entry_type),
2619 size_int (BITS_PER_UNIT));
2620 offset = size_binop (MULT_EXPR, offset, num_extra_vtbl_entries (binfo));
2621 return fold (offset);
2624 /* Construct the initializer for BINFOs virtual function table. BINFO
2625 is part of the hierarchy dominated by T. */
2628 build_vtbl_initializer (binfo, t)
2632 tree v = BINFO_VIRTUALS (binfo);
2633 tree inits = NULL_TREE;
2634 tree type = BINFO_TYPE (binfo);
2636 /* Add entries to the vtable that indicate how to adjust the this
2637 pointer when calling a virtual function in this class. */
2638 inits = build_vcall_offset_vtbl_entries (binfo, t);
2640 /* Add entries to the vtable for offsets to our virtual bases. */
2641 inits = chainon (build_vbase_offset_vtbl_entries (binfo, t),
2644 /* Process the RTTI stuff at the head of the list. If we're not
2645 using vtable thunks, then the RTTI entry is just an ordinary
2646 function, and we can process it just like the other virtual
2647 function entries. */
2648 if (!CLASSTYPE_COM_INTERFACE (type) && flag_vtable_thunks)
2653 /* The first entry is an offset. */
2654 offset = TREE_PURPOSE (v);
2655 my_friendly_assert (TREE_CODE (offset) == INTEGER_CST,
2658 /* Convert the offset to look like a function pointer, so that
2659 we can put it in the vtable. */
2660 init = build1 (NOP_EXPR, vfunc_ptr_type_node, offset);
2661 TREE_CONSTANT (init) = 1;
2662 inits = tree_cons (NULL_TREE, init, inits);
2666 if (new_abi_rtti_p ())
2668 tree decl = TREE_VALUE (v);
2671 decl = build_unary_op (ADDR_EXPR, decl, 0);
2673 decl = integer_zero_node;
2674 decl = build1 (NOP_EXPR, vfunc_ptr_type_node, decl);
2675 TREE_CONSTANT (decl) = 1;
2676 decl = build_vtable_entry (integer_zero_node, integer_zero_node,
2678 inits = tree_cons (NULL_TREE, decl, inits);
2682 /* In the old abi the second entry (the tdesc pointer) is
2683 just an ordinary function, so it can be dealt with like the
2684 virtual functions. */
2687 /* Go through all the ordinary virtual functions, building up
2696 /* Pull the offset for `this', and the function to call, out of
2698 delta = BV_DELTA (v);
2699 vcall_index = BV_VCALL_INDEX (v);
2701 my_friendly_assert (TREE_CODE (delta) == INTEGER_CST, 19990727);
2702 my_friendly_assert (TREE_CODE (fn) == FUNCTION_DECL, 19990727);
2704 /* You can't call an abstract virtual function; it's abstract.
2705 So, we replace these functions with __pure_virtual. */
2706 if (DECL_PURE_VIRTUAL_P (fn))
2709 /* Package up that information for the vtable. */
2710 init = build_vtable_entry (delta, vcall_index, fn);
2711 /* And add it to the chain of initializers. */
2712 inits = tree_cons (NULL_TREE, init, inits);
2718 /* The initializers were built up in reverse order; straighten them
2720 inits = nreverse (inits);
2721 /* Package all the initializers up as an array initializer. */
2722 return build_nt (CONSTRUCTOR, NULL_TREE, inits);
2725 /* Called from finish_vtbls via dfs_walk. */
2728 dfs_finish_vtbls (binfo, data)
2732 if (!BINFO_PRIMARY_MARKED_P (binfo)
2733 && CLASSTYPE_VFIELDS (BINFO_TYPE (binfo))
2734 && BINFO_NEW_VTABLE_MARKED (binfo))
2739 layout_vtable_decl (binfo, list_length (BINFO_VIRTUALS (binfo)));
2740 decl = BINFO_VTABLE (binfo);
2741 context = DECL_CONTEXT (decl);
2742 DECL_CONTEXT (decl) = 0;
2743 DECL_INITIAL (decl) = build_vtbl_initializer (binfo, (tree) data);
2744 cp_finish_decl (decl, DECL_INITIAL (decl), NULL_TREE, 0);
2745 DECL_CONTEXT (decl) = context;
2748 CLEAR_BINFO_NEW_VTABLE_MARKED (binfo);
2749 SET_BINFO_MARKED (binfo);
2754 /* Create all the necessary vtables for T and its base classes. */
2760 dfs_walk (TYPE_BINFO (t), dfs_finish_vtbls,
2761 dfs_unmarked_real_bases_queue_p, t);
2762 dfs_walk (TYPE_BINFO (t), dfs_unmark,
2763 dfs_marked_real_bases_queue_p, t);
2766 /* True if we should override the given BASE_FNDECL with the given
2770 overrides (fndecl, base_fndecl)
2771 tree fndecl, base_fndecl;
2773 /* Destructors have special names. */
2774 if (DESTRUCTOR_NAME_P (DECL_ASSEMBLER_NAME (base_fndecl))
2775 && DESTRUCTOR_NAME_P (DECL_ASSEMBLER_NAME (fndecl)))
2777 if (DESTRUCTOR_NAME_P (DECL_ASSEMBLER_NAME (base_fndecl))
2778 || DESTRUCTOR_NAME_P (DECL_ASSEMBLER_NAME (fndecl)))
2780 if (DECL_NAME (fndecl) == DECL_NAME (base_fndecl))
2782 tree types, base_types;
2784 retypes = TREE_TYPE (TREE_TYPE (fndecl));
2785 base_retypes = TREE_TYPE (TREE_TYPE (base_fndecl));
2787 types = TYPE_ARG_TYPES (TREE_TYPE (fndecl));
2788 base_types = TYPE_ARG_TYPES (TREE_TYPE (base_fndecl));
2789 if ((TYPE_QUALS (TREE_TYPE (TREE_VALUE (base_types)))
2790 == TYPE_QUALS (TREE_TYPE (TREE_VALUE (types))))
2791 && compparms (TREE_CHAIN (base_types), TREE_CHAIN (types)))
2797 typedef struct find_final_overrider_data_s {
2798 /* The function for which we are trying to find a final overrider. */
2800 /* The base class in which the function was declared. */
2801 tree declaring_base;
2802 /* The most derived class in the hierarchy. */
2803 tree most_derived_type;
2804 /* The final overriding function. */
2806 /* The BINFO for the class in which the final overriding function
2808 tree overriding_base;
2809 } find_final_overrider_data;
2811 /* Called from find_final_overrider via dfs_walk. */
2814 dfs_find_final_overrider (binfo, data)
2818 find_final_overrider_data *ffod = (find_final_overrider_data *) data;
2820 if (same_type_p (BINFO_TYPE (binfo),
2821 BINFO_TYPE (ffod->declaring_base))
2822 && tree_int_cst_equal (BINFO_OFFSET (binfo),
2823 BINFO_OFFSET (ffod->declaring_base)))
2828 /* We've found a path to the declaring base. Walk down the path
2829 looking for an overrider for FN. */
2830 for (path = reverse_path (binfo);
2832 path = TREE_CHAIN (path))
2834 for (method = TYPE_METHODS (BINFO_TYPE (TREE_VALUE (path)));
2836 method = TREE_CHAIN (method))
2837 if (DECL_VIRTUAL_P (method) && overrides (method, ffod->fn))
2844 /* If we found an overrider, record the overriding function, and
2845 the base from which it came. */
2848 if (ffod->overriding_fn && ffod->overriding_fn != method)
2850 /* We've found a different overrider along a different
2851 path. That can be OK if the new one overrides the
2854 struct S { virtual void f(); };
2855 struct T : public virtual S { virtual void f(); };
2856 struct U : public virtual S, public virtual T {};
2858 Here `T::f' is the final overrider for `S::f'. */
2859 if (strictly_overrides (method, ffod->overriding_fn))
2861 ffod->overriding_fn = method;
2862 ffod->overriding_base = TREE_VALUE (path);
2864 else if (!strictly_overrides (ffod->overriding_fn, method))
2866 cp_error ("no unique final overrider for `%D' in `%T'",
2867 ffod->most_derived_type,
2869 cp_error ("candidates are: `%#D'", ffod->overriding_fn);
2870 cp_error (" `%#D'", method);
2871 return error_mark_node;
2874 else if (ffod->overriding_base
2875 && (!tree_int_cst_equal
2876 (BINFO_OFFSET (TREE_VALUE (path)),
2877 BINFO_OFFSET (ffod->overriding_base))))
2879 /* We've found two instances of the same base that
2880 provide overriders. */
2881 cp_error ("no unique final overrider for `%D' since there two instances of `%T' in `%T'",
2883 BINFO_TYPE (ffod->overriding_base),
2884 ffod->most_derived_type);
2885 return error_mark_node;
2889 ffod->overriding_fn = method;
2890 ffod->overriding_base = TREE_VALUE (path);
2898 /* Returns a TREE_LIST whose TREE_PURPOSE is the final overrider for
2899 FN and whose TREE_VALUE is the binfo for the base where the
2900 overriding occurs. BINFO (in the hierarchy dominated by T) is the
2901 base object in which FN is declared. */
2904 find_final_overrider (t, binfo, fn)
2909 find_final_overrider_data ffod;
2911 /* Getting this right is a little tricky. This is legal:
2913 struct S { virtual void f (); };
2914 struct T { virtual void f (); };
2915 struct U : public S, public T { };
2917 even though calling `f' in `U' is ambiguous. But,
2919 struct R { virtual void f(); };
2920 struct S : virtual public R { virtual void f (); };
2921 struct T : virtual public R { virtual void f (); };
2922 struct U : public S, public T { };
2924 is not -- there's no way to decide whether to put `S::f' or
2925 `T::f' in the vtable for `R'.
2927 The solution is to look at all paths to BINFO. If we find
2928 different overriders along any two, then there is a problem. */
2930 ffod.declaring_base = binfo;
2931 ffod.most_derived_type = t;
2932 ffod.overriding_fn = NULL_TREE;
2933 ffod.overriding_base = NULL_TREE;
2935 if (dfs_walk (TYPE_BINFO (t),
2936 dfs_find_final_overrider,
2939 return error_mark_node;
2941 return build_tree_list (ffod.overriding_fn, ffod.overriding_base);
2944 /* Return the BINFO_VIRTUALS list for BINFO, without the RTTI stuff at
2945 the front. If non-NULL, N is set to the number of entries
2949 skip_rtti_stuff (binfo, t, n)
2952 unsigned HOST_WIDE_INT *n;
2956 if (CLASSTYPE_COM_INTERFACE (t))
2961 virtuals = BINFO_VIRTUALS (binfo);
2964 /* We always reserve a slot for the offset/tdesc entry. */
2967 virtuals = TREE_CHAIN (virtuals);
2969 if (flag_vtable_thunks && virtuals)
2971 /* The second slot is reserved for the tdesc pointer when thunks
2975 virtuals = TREE_CHAIN (virtuals);
2981 /* Called via dfs_walk. Returns BINFO if BINFO has the same type as
2982 DATA (which is really an _TYPE node). */
2985 dfs_find_base (binfo, data)
2989 return (same_type_p (BINFO_TYPE (binfo), (tree) data)
2990 ? binfo : NULL_TREE);
2993 /* Called from modify_all_vtables via dfs_walk. */
2996 dfs_modify_vtables (binfo, data)
3000 if (/* There's no need to modify the vtable for a primary base;
3001 we're not going to use that vtable anyhow. */
3002 !BINFO_PRIMARY_MARKED_P (binfo)
3003 /* Similarly, a base without a vtable needs no modification. */
3004 && CLASSTYPE_VFIELDS (BINFO_TYPE (binfo)))
3012 /* If we're supporting RTTI then we always need a new vtable to
3013 point to the RTTI information. Under the new ABI we may need
3014 a new vtable to contain vcall and vbase offsets. */
3015 if (flag_rtti || flag_new_abi)
3016 make_new_vtable (t, binfo);
3018 /* Now, go through each of the virtual functions in the virtual
3019 function table for BINFO. Find the final overrider, and
3020 update the BINFO_VIRTUALS list appropriately. */
3021 for (virtuals = skip_rtti_stuff (binfo, BINFO_TYPE (binfo), NULL),
3022 old_virtuals = skip_rtti_stuff (TYPE_BINFO (BINFO_TYPE (binfo)),
3026 virtuals = TREE_CHAIN (virtuals),
3027 old_virtuals = TREE_CHAIN (old_virtuals))
3036 /* Find the function which originally caused this vtable
3037 entry to be present. */
3038 fn = BV_FN (old_virtuals);
3039 vindex = DECL_VINDEX (fn);
3040 b = dfs_walk (binfo, dfs_find_base, NULL, DECL_VIRTUAL_CONTEXT (fn));
3041 fn = skip_rtti_stuff (TYPE_BINFO (BINFO_TYPE (b)),
3044 while (i < TREE_INT_CST_LOW (vindex))
3046 fn = TREE_CHAIN (fn);
3051 /* Handle the case of a virtual function defined in BINFO
3053 overrider = find_final_overrider (t, b, fn);
3054 if (overrider == error_mark_node)
3057 /* The `this' pointer needs to be adjusted from pointing to
3058 BINFO to pointing at the base where the final overrider
3060 delta = size_binop (PLUS_EXPR,
3061 get_derived_offset (binfo,
3062 DECL_VIRTUAL_CONTEXT (fn)),
3063 BINFO_OFFSET (binfo));
3064 delta = ssize_binop (MINUS_EXPR,
3065 BINFO_OFFSET (TREE_VALUE (overrider)),
3068 modify_vtable_entry (t,
3070 TREE_PURPOSE (overrider),
3076 SET_BINFO_MARKED (binfo);
3081 /* Update all of the primary and secondary vtables for T. Create new
3082 vtables as required, and initialize their RTTI information. Each
3083 of the functions in OVERRIDDEN_VIRTUALS overrides a virtual
3084 function from a base class; find and modify the appropriate entries
3085 to point to the overriding functions. Returns a list, in
3086 declaration order, of the functions that are overridden in this
3087 class, but do not appear in the primary base class vtable, and
3088 which should therefore be appended to the end of the vtable for T. */
3091 modify_all_vtables (t, has_virtual_p, overridden_virtuals)
3094 tree overridden_virtuals;
3098 binfo = TYPE_BINFO (t);
3100 /* Update all of the vtables. */
3103 dfs_unmarked_real_bases_queue_p,
3105 dfs_walk (binfo, dfs_unmark, dfs_marked_real_bases_queue_p, t);
3107 /* If we should include overriding functions for secondary vtables
3108 in our primary vtable, add them now. */
3109 if (all_overridden_vfuns_in_vtables_p ())
3111 tree *fnsp = &overridden_virtuals;
3115 tree fn = TREE_VALUE (*fnsp);
3117 if (BINFO_VIRTUALS (binfo)
3118 && !value_member (fn, BINFO_VIRTUALS (binfo)))
3120 /* We know we need a vtable for this class now. */
3121 start_vtable (t, has_virtual_p);
3122 /* Set the vtable index. */
3124 = build_shared_int_cst ((*has_virtual_p)++);
3125 /* We don't need to convert to a base class when calling
3127 DECL_VIRTUAL_CONTEXT (fn) = t;
3128 /* We don't need to adjust the `this' pointer when
3129 calling this function. */
3130 BV_DELTA (*fnsp) = integer_zero_node;
3131 BV_VCALL_INDEX (*fnsp) = integer_zero_node;
3133 /* This is an overridden function not already in our
3135 fnsp = &TREE_CHAIN (*fnsp);
3138 /* We've already got an entry for this function. Skip
3140 *fnsp = TREE_CHAIN (*fnsp);
3144 overridden_virtuals = NULL_TREE;
3146 return overridden_virtuals;
3149 /* Here, we already know that they match in every respect.
3150 All we have to check is where they had their declarations. */
3153 strictly_overrides (fndecl1, fndecl2)
3154 tree fndecl1, fndecl2;
3156 int distance = get_base_distance (DECL_CONTEXT (fndecl2),
3157 DECL_CONTEXT (fndecl1),
3159 if (distance == -2 || distance > 0)
3164 /* Get the base virtual function declarations in T that are either
3165 overridden or hidden by FNDECL as a list. We set TREE_PURPOSE with
3166 the overrider/hider. */
3169 get_basefndecls (fndecl, t)
3172 tree methods = TYPE_METHODS (t);
3173 tree base_fndecls = NULL_TREE;
3174 tree binfos = BINFO_BASETYPES (TYPE_BINFO (t));
3175 int i, n_baseclasses = binfos ? TREE_VEC_LENGTH (binfos) : 0;
3179 if (TREE_CODE (methods) == FUNCTION_DECL
3180 && DECL_VINDEX (methods) != NULL_TREE
3181 && DECL_NAME (fndecl) == DECL_NAME (methods))
3182 base_fndecls = tree_cons (fndecl, methods, base_fndecls);
3184 methods = TREE_CHAIN (methods);
3188 return base_fndecls;
3190 for (i = 0; i < n_baseclasses; i++)
3192 tree base_binfo = TREE_VEC_ELT (binfos, i);
3193 tree basetype = BINFO_TYPE (base_binfo);
3195 base_fndecls = chainon (get_basefndecls (fndecl, basetype),
3199 return base_fndecls;
3202 /* Mark the functions that have been hidden with their overriders.
3203 Since we start out with all functions already marked with a hider,
3204 no need to mark functions that are just hidden.
3206 Subroutine of warn_hidden. */
3209 mark_overriders (fndecl, base_fndecls)
3210 tree fndecl, base_fndecls;
3212 for (; base_fndecls; base_fndecls = TREE_CHAIN (base_fndecls))
3214 if (overrides (fndecl, TREE_VALUE (base_fndecls)))
3215 TREE_PURPOSE (base_fndecls) = fndecl;
3219 /* If this declaration supersedes the declaration of
3220 a method declared virtual in the base class, then
3221 mark this field as being virtual as well. */
3224 check_for_override (decl, ctype)
3227 tree binfos = BINFO_BASETYPES (TYPE_BINFO (ctype));
3228 int i, n_baselinks = binfos ? TREE_VEC_LENGTH (binfos) : 0;
3229 int virtualp = DECL_VIRTUAL_P (decl);
3230 int found_overriden_fn = 0;
3232 for (i = 0; i < n_baselinks; i++)
3234 tree base_binfo = TREE_VEC_ELT (binfos, i);
3235 if (TYPE_POLYMORPHIC_P (BINFO_TYPE (base_binfo)))
3237 tree tmp = get_matching_virtual
3239 DESTRUCTOR_NAME_P (DECL_ASSEMBLER_NAME (decl)));
3241 if (tmp && !found_overriden_fn)
3243 /* If this function overrides some virtual in some base
3244 class, then the function itself is also necessarily
3245 virtual, even if the user didn't explicitly say so. */
3246 DECL_VIRTUAL_P (decl) = 1;
3248 /* The TMP we really want is the one from the deepest
3249 baseclass on this path, taking care not to
3250 duplicate if we have already found it (via another
3251 path to its virtual baseclass. */
3252 if (TREE_CODE (TREE_TYPE (decl)) == FUNCTION_TYPE)
3254 cp_error_at ("`static %#D' cannot be declared", decl);
3255 cp_error_at (" since `virtual %#D' declared in base class",
3261 /* Set DECL_VINDEX to a value that is neither an
3262 INTEGER_CST nor the error_mark_node so that
3263 add_virtual_function will realize this is an
3264 overridden function. */
3266 = tree_cons (tmp, NULL_TREE, DECL_VINDEX (decl));
3268 /* We now know that DECL overrides something,
3269 which is all that is important. But, we must
3270 continue to iterate through all the base-classes
3271 in order to allow get_matching_virtual to check for
3272 various illegal overrides. */
3273 found_overriden_fn = 1;
3279 if (DECL_VINDEX (decl) == NULL_TREE)
3280 DECL_VINDEX (decl) = error_mark_node;
3281 IDENTIFIER_VIRTUAL_P (DECL_NAME (decl)) = 1;
3285 /* Warn about hidden virtual functions that are not overridden in t.
3286 We know that constructors and destructors don't apply. */
3292 tree method_vec = CLASSTYPE_METHOD_VEC (t);
3293 int n_methods = method_vec ? TREE_VEC_LENGTH (method_vec) : 0;
3296 /* We go through each separately named virtual function. */
3297 for (i = 2; i < n_methods && TREE_VEC_ELT (method_vec, i); ++i)
3299 tree fns = TREE_VEC_ELT (method_vec, i);
3300 tree fndecl = NULL_TREE;
3302 tree base_fndecls = NULL_TREE;
3303 tree binfos = BINFO_BASETYPES (TYPE_BINFO (t));
3304 int i, n_baseclasses = binfos ? TREE_VEC_LENGTH (binfos) : 0;
3306 /* First see if we have any virtual functions in this batch. */
3307 for (; fns; fns = OVL_NEXT (fns))
3309 fndecl = OVL_CURRENT (fns);
3310 if (DECL_VINDEX (fndecl))
3314 if (fns == NULL_TREE)
3317 /* First we get a list of all possible functions that might be
3318 hidden from each base class. */
3319 for (i = 0; i < n_baseclasses; i++)
3321 tree base_binfo = TREE_VEC_ELT (binfos, i);
3322 tree basetype = BINFO_TYPE (base_binfo);
3324 base_fndecls = chainon (get_basefndecls (fndecl, basetype),
3328 fns = OVL_NEXT (fns);
3330 /* ...then mark up all the base functions with overriders, preferring
3331 overriders to hiders. */
3333 for (; fns; fns = OVL_NEXT (fns))
3335 fndecl = OVL_CURRENT (fns);
3336 if (DECL_VINDEX (fndecl))
3337 mark_overriders (fndecl, base_fndecls);
3340 /* Now give a warning for all base functions without overriders,
3341 as they are hidden. */
3342 for (; base_fndecls; base_fndecls = TREE_CHAIN (base_fndecls))
3344 if (! overrides (TREE_PURPOSE (base_fndecls),
3345 TREE_VALUE (base_fndecls)))
3347 /* Here we know it is a hider, and no overrider exists. */
3348 cp_warning_at ("`%D' was hidden", TREE_VALUE (base_fndecls));
3349 cp_warning_at (" by `%D'", TREE_PURPOSE (base_fndecls));
3355 /* Check for things that are invalid. There are probably plenty of other
3356 things we should check for also. */
3359 finish_struct_anon (t)
3364 for (field = TYPE_FIELDS (t); field; field = TREE_CHAIN (field))
3366 if (TREE_STATIC (field))
3368 if (TREE_CODE (field) != FIELD_DECL)
3371 if (DECL_NAME (field) == NULL_TREE
3372 && ANON_AGGR_TYPE_P (TREE_TYPE (field)))
3374 tree elt = TYPE_FIELDS (TREE_TYPE (field));
3375 for (; elt; elt = TREE_CHAIN (elt))
3377 if (DECL_ARTIFICIAL (elt))
3380 if (DECL_NAME (elt) == constructor_name (t))
3381 cp_pedwarn_at ("ANSI C++ forbids member `%D' with same name as enclosing class",
3384 if (TREE_CODE (elt) != FIELD_DECL)
3386 cp_pedwarn_at ("`%#D' invalid; an anonymous union can only have non-static data members",
3391 if (TREE_PRIVATE (elt))
3392 cp_pedwarn_at ("private member `%#D' in anonymous union",
3394 else if (TREE_PROTECTED (elt))
3395 cp_pedwarn_at ("protected member `%#D' in anonymous union",
3398 TREE_PRIVATE (elt) = TREE_PRIVATE (field);
3399 TREE_PROTECTED (elt) = TREE_PROTECTED (field);
3405 extern int interface_only, interface_unknown;
3407 /* Create default constructors, assignment operators, and so forth for
3408 the type indicated by T, if they are needed.
3409 CANT_HAVE_DEFAULT_CTOR, CANT_HAVE_CONST_CTOR, and
3410 CANT_HAVE_ASSIGNMENT are nonzero if, for whatever reason, the class
3411 cannot have a default constructor, copy constructor taking a const
3412 reference argument, or an assignment operator, respectively. If a
3413 virtual destructor is created, its DECL is returned; otherwise the
3414 return value is NULL_TREE. */
3417 add_implicitly_declared_members (t, cant_have_default_ctor,
3418 cant_have_const_cctor,
3419 cant_have_assignment)
3421 int cant_have_default_ctor;
3422 int cant_have_const_cctor;
3423 int cant_have_assignment;
3426 tree implicit_fns = NULL_TREE;
3427 tree name = TYPE_IDENTIFIER (t);
3428 tree virtual_dtor = NULL_TREE;
3432 if (TYPE_NEEDS_DESTRUCTOR (t) && !TYPE_HAS_DESTRUCTOR (t))
3434 default_fn = cons_up_default_function (t, name, 0);
3435 check_for_override (default_fn, t);
3437 /* If we couldn't make it work, then pretend we didn't need it. */
3438 if (default_fn == void_type_node)
3439 TYPE_NEEDS_DESTRUCTOR (t) = 0;
3442 TREE_CHAIN (default_fn) = implicit_fns;
3443 implicit_fns = default_fn;
3445 if (DECL_VINDEX (default_fn))
3446 virtual_dtor = default_fn;
3449 TYPE_NEEDS_DESTRUCTOR (t) |= TYPE_HAS_DESTRUCTOR (t);
3451 /* Default constructor. */
3452 if (! TYPE_HAS_CONSTRUCTOR (t) && ! cant_have_default_ctor)
3454 default_fn = cons_up_default_function (t, name, 2);
3455 TREE_CHAIN (default_fn) = implicit_fns;
3456 implicit_fns = default_fn;
3459 /* Copy constructor. */
3460 if (! TYPE_HAS_INIT_REF (t) && ! TYPE_FOR_JAVA (t))
3462 /* ARM 12.18: You get either X(X&) or X(const X&), but
3464 default_fn = cons_up_default_function (t, name,
3465 3 + cant_have_const_cctor);
3466 TREE_CHAIN (default_fn) = implicit_fns;
3467 implicit_fns = default_fn;
3470 /* Assignment operator. */
3471 if (! TYPE_HAS_ASSIGN_REF (t) && ! TYPE_FOR_JAVA (t))
3473 default_fn = cons_up_default_function (t, name,
3474 5 + cant_have_assignment);
3475 TREE_CHAIN (default_fn) = implicit_fns;
3476 implicit_fns = default_fn;
3479 /* Now, hook all of the new functions on to TYPE_METHODS,
3480 and add them to the CLASSTYPE_METHOD_VEC. */
3481 for (f = &implicit_fns; *f; f = &TREE_CHAIN (*f))
3482 add_method (t, 0, *f);
3483 *f = TYPE_METHODS (t);
3484 TYPE_METHODS (t) = implicit_fns;
3486 return virtual_dtor;
3489 /* Subroutine of finish_struct_1. Recursively count the number of fields
3490 in TYPE, including anonymous union members. */
3493 count_fields (fields)
3498 for (x = fields; x; x = TREE_CHAIN (x))
3500 if (TREE_CODE (x) == FIELD_DECL && ANON_AGGR_TYPE_P (TREE_TYPE (x)))
3501 n_fields += count_fields (TYPE_FIELDS (TREE_TYPE (x)));
3508 /* Subroutine of finish_struct_1. Recursively add all the fields in the
3509 TREE_LIST FIELDS to the TREE_VEC FIELD_VEC, starting at offset IDX. */
3512 add_fields_to_vec (fields, field_vec, idx)
3513 tree fields, field_vec;
3517 for (x = fields; x; x = TREE_CHAIN (x))
3519 if (TREE_CODE (x) == FIELD_DECL && ANON_AGGR_TYPE_P (TREE_TYPE (x)))
3520 idx = add_fields_to_vec (TYPE_FIELDS (TREE_TYPE (x)), field_vec, idx);
3522 TREE_VEC_ELT (field_vec, idx++) = x;
3527 /* FIELD is a bit-field. We are finishing the processing for its
3528 enclosing type. Issue any appropriate messages and set appropriate
3532 check_bitfield_decl (field)
3535 tree type = TREE_TYPE (field);
3537 /* Invalid bit-field size done by grokfield. */
3538 /* Detect invalid bit-field type. Simply checking if TYPE is
3539 integral is insufficient, as that is the array core of the field
3540 type. If TREE_TYPE (field) is integral, then TYPE must be the same. */
3541 if (DECL_INITIAL (field)
3542 && ! INTEGRAL_TYPE_P (TREE_TYPE (field)))
3544 cp_error_at ("bit-field `%#D' with non-integral type", field);
3545 DECL_INITIAL (field) = NULL;
3548 /* Detect and ignore out of range field width. */
3549 if (DECL_INITIAL (field))
3551 tree w = DECL_INITIAL (field);
3552 register int width = 0;
3554 /* Avoid the non_lvalue wrapper added by fold for PLUS_EXPRs. */
3557 /* detect invalid field size. */
3558 if (TREE_CODE (w) == CONST_DECL)
3559 w = DECL_INITIAL (w);
3560 else if (TREE_READONLY_DECL_P (w))
3561 w = decl_constant_value (w);
3563 if (TREE_CODE (w) != INTEGER_CST)
3565 cp_error_at ("bit-field `%D' width not an integer constant",
3567 DECL_INITIAL (field) = NULL_TREE;
3569 else if (width = TREE_INT_CST_LOW (w),
3572 DECL_INITIAL (field) = NULL;
3573 cp_error_at ("negative width in bit-field `%D'", field);
3575 else if (width == 0 && DECL_NAME (field) != 0)
3577 DECL_INITIAL (field) = NULL;
3578 cp_error_at ("zero width for bit-field `%D'", field);
3581 > TYPE_PRECISION (long_long_unsigned_type_node))
3583 /* The backend will dump if you try to use something too
3585 DECL_INITIAL (field) = NULL;
3586 sorry ("bit-fields larger than %d bits",
3587 TYPE_PRECISION (long_long_unsigned_type_node));
3588 cp_error_at (" in declaration of `%D'", field);
3590 else if (width > TYPE_PRECISION (type)
3591 && TREE_CODE (type) != ENUMERAL_TYPE
3592 && TREE_CODE (type) != BOOLEAN_TYPE)
3593 cp_warning_at ("width of `%D' exceeds its type", field);
3594 else if (TREE_CODE (type) == ENUMERAL_TYPE
3595 && ((min_precision (TYPE_MIN_VALUE (type),
3596 TREE_UNSIGNED (type)) > width)
3597 || (min_precision (TYPE_MAX_VALUE (type),
3598 TREE_UNSIGNED (type)) > width)))
3599 cp_warning_at ("`%D' is too small to hold all values of `%#T'",
3602 if (DECL_INITIAL (field))
3604 DECL_INITIAL (field) = NULL_TREE;
3605 DECL_FIELD_SIZE (field) = width;
3606 DECL_BIT_FIELD (field) = 1;
3610 #ifdef EMPTY_FIELD_BOUNDARY
3611 DECL_ALIGN (field) = MAX (DECL_ALIGN (field),
3612 EMPTY_FIELD_BOUNDARY);
3614 #ifdef PCC_BITFIELD_TYPE_MATTERS
3615 if (PCC_BITFIELD_TYPE_MATTERS)
3616 DECL_ALIGN (field) = MAX (DECL_ALIGN (field),
3623 /* Non-bit-fields are aligned for their type. */
3624 DECL_ALIGN (field) = MAX (DECL_ALIGN (field), TYPE_ALIGN (type));
3627 /* FIELD is a non bit-field. We are finishing the processing for its
3628 enclosing type T. Issue any appropriate messages and set appropriate
3632 check_field_decl (field, t, cant_have_const_ctor,
3633 cant_have_default_ctor, no_const_asn_ref,
3634 any_default_members)
3637 int *cant_have_const_ctor;
3638 int *cant_have_default_ctor;
3639 int *no_const_asn_ref;
3640 int *any_default_members;
3642 tree type = strip_array_types (TREE_TYPE (field));
3644 /* An anonymous union cannot contain any fields which would change
3645 the settings of CANT_HAVE_CONST_CTOR and friends. */
3646 if (ANON_UNION_TYPE_P (type))
3648 /* And, we don't set TYPE_HAS_CONST_INIT_REF, etc., for anonymous
3649 structs. So, we recurse through their fields here. */
3650 else if (ANON_AGGR_TYPE_P (type))
3654 for (fields = TYPE_FIELDS (type); fields; fields = TREE_CHAIN (fields))
3655 if (TREE_CODE (field) == FIELD_DECL && !DECL_C_BIT_FIELD (field))
3656 check_field_decl (fields, t, cant_have_const_ctor,
3657 cant_have_default_ctor, no_const_asn_ref,
3658 any_default_members);
3660 /* Check members with class type for constructors, destructors,
3662 else if (CLASS_TYPE_P (type))
3664 /* Never let anything with uninheritable virtuals
3665 make it through without complaint. */
3666 abstract_virtuals_error (field, type);
3668 if (TREE_CODE (t) == UNION_TYPE)
3670 if (TYPE_NEEDS_CONSTRUCTING (type))
3671 cp_error_at ("member `%#D' with constructor not allowed in union",
3673 if (TYPE_NEEDS_DESTRUCTOR (type))
3674 cp_error_at ("member `%#D' with destructor not allowed in union",
3676 if (TYPE_HAS_COMPLEX_ASSIGN_REF (type))
3677 cp_error_at ("member `%#D' with copy assignment operator not allowed in union",
3682 TYPE_NEEDS_CONSTRUCTING (t) |= TYPE_NEEDS_CONSTRUCTING (type);
3683 TYPE_NEEDS_DESTRUCTOR (t) |= TYPE_NEEDS_DESTRUCTOR (type);
3684 TYPE_HAS_COMPLEX_ASSIGN_REF (t) |= TYPE_HAS_COMPLEX_ASSIGN_REF (type);
3685 TYPE_HAS_COMPLEX_INIT_REF (t) |= TYPE_HAS_COMPLEX_INIT_REF (type);
3688 if (!TYPE_HAS_CONST_INIT_REF (type))
3689 *cant_have_const_ctor = 1;
3691 if (!TYPE_HAS_CONST_ASSIGN_REF (type))
3692 *no_const_asn_ref = 1;
3694 if (TYPE_HAS_CONSTRUCTOR (type)
3695 && ! TYPE_HAS_DEFAULT_CONSTRUCTOR (type))
3696 *cant_have_default_ctor = 1;
3698 if (DECL_INITIAL (field) != NULL_TREE)
3700 /* `build_class_init_list' does not recognize
3702 if (TREE_CODE (t) == UNION_TYPE && any_default_members != 0)
3703 cp_error_at ("multiple fields in union `%T' initialized");
3704 *any_default_members = 1;
3707 /* Non-bit-fields are aligned for their type, except packed fields
3708 which require only BITS_PER_UNIT alignment. */
3709 DECL_ALIGN (field) = MAX (DECL_ALIGN (field),
3710 (DECL_PACKED (field)
3712 : TYPE_ALIGN (TREE_TYPE (field))));
3715 /* Check the data members (both static and non-static), class-scoped
3716 typedefs, etc., appearing in the declaration of T. Issue
3717 appropriate diagnostics. Sets ACCESS_DECLS to a list (in
3718 declaration order) of access declarations; each TREE_VALUE in this
3719 list is a USING_DECL.
3721 In addition, set the following flags:
3724 The class is empty, i.e., contains no non-static data members.
3726 CANT_HAVE_DEFAULT_CTOR_P
3727 This class cannot have an implicitly generated default
3730 CANT_HAVE_CONST_CTOR_P
3731 This class cannot have an implicitly generated copy constructor
3732 taking a const reference.
3734 CANT_HAVE_CONST_ASN_REF
3735 This class cannot have an implicitly generated assignment
3736 operator taking a const reference.
3738 All of these flags should be initialized before calling this
3741 Returns a pointer to the end of the TYPE_FIELDs chain; additional
3742 fields can be added by adding to this chain. */
3745 check_field_decls (t, access_decls, empty_p,
3746 cant_have_default_ctor_p, cant_have_const_ctor_p,
3751 int *cant_have_default_ctor_p;
3752 int *cant_have_const_ctor_p;
3753 int *no_const_asn_ref_p;
3758 int any_default_members;
3760 /* First, delete any duplicate fields. */
3761 delete_duplicate_fields (TYPE_FIELDS (t));
3763 /* Assume there are no access declarations. */
3764 *access_decls = NULL_TREE;
3765 /* Assume this class has no pointer members. */
3767 /* Assume none of the members of this class have default
3769 any_default_members = 0;
3771 for (field = &TYPE_FIELDS (t); *field; field = next)
3774 tree type = TREE_TYPE (x);
3776 GNU_xref_member (current_class_name, x);
3778 next = &TREE_CHAIN (x);
3780 if (TREE_CODE (x) == FIELD_DECL)
3782 DECL_PACKED (x) |= TYPE_PACKED (t);
3784 if (DECL_C_BIT_FIELD (x) && integer_zerop (DECL_INITIAL (x)))
3785 /* We don't treat zero-width bitfields as making a class
3790 /* The class is non-empty. */
3792 /* The class is not even nearly empty. */
3793 CLASSTYPE_NEARLY_EMPTY_P (t) = 0;
3797 if (TREE_CODE (x) == USING_DECL)
3799 /* Prune the access declaration from the list of fields. */
3800 *field = TREE_CHAIN (x);
3802 /* Save the access declarations for our caller. */
3803 *access_decls = tree_cons (NULL_TREE, x, *access_decls);
3805 /* Since we've reset *FIELD there's no reason to skip to the
3811 if (TREE_CODE (x) == TYPE_DECL
3812 || TREE_CODE (x) == TEMPLATE_DECL)
3815 /* If we've gotten this far, it's a data member, possibly static,
3816 or an enumerator. */
3818 DECL_FIELD_CONTEXT (x) = t;
3820 /* ``A local class cannot have static data members.'' ARM 9.4 */
3821 if (current_function_decl && TREE_STATIC (x))
3822 cp_error_at ("field `%D' in local class cannot be static", x);
3824 /* Perform error checking that did not get done in
3826 if (TREE_CODE (type) == FUNCTION_TYPE)
3828 cp_error_at ("field `%D' invalidly declared function type",
3830 type = build_pointer_type (type);
3831 TREE_TYPE (x) = type;
3833 else if (TREE_CODE (type) == METHOD_TYPE)
3835 cp_error_at ("field `%D' invalidly declared method type", x);
3836 type = build_pointer_type (type);
3837 TREE_TYPE (x) = type;
3839 else if (TREE_CODE (type) == OFFSET_TYPE)
3841 cp_error_at ("field `%D' invalidly declared offset type", x);
3842 type = build_pointer_type (type);
3843 TREE_TYPE (x) = type;
3846 if (type == error_mark_node)
3849 DECL_SAVED_INSNS (x) = 0;
3850 DECL_FIELD_SIZE (x) = 0;
3852 /* When this goes into scope, it will be a non-local reference. */
3853 DECL_NONLOCAL (x) = 1;
3855 if (TREE_CODE (x) == CONST_DECL)
3858 if (TREE_CODE (x) == VAR_DECL)
3860 if (TREE_CODE (t) == UNION_TYPE)
3861 /* Unions cannot have static members. */
3862 cp_error_at ("field `%D' declared static in union", x);
3867 /* Now it can only be a FIELD_DECL. */
3869 if (TREE_PRIVATE (x) || TREE_PROTECTED (x))
3870 CLASSTYPE_NON_AGGREGATE (t) = 1;
3872 /* If this is of reference type, check if it needs an init.
3873 Also do a little ANSI jig if necessary. */
3874 if (TREE_CODE (type) == REFERENCE_TYPE)
3876 CLASSTYPE_NON_POD_P (t) = 1;
3877 if (DECL_INITIAL (x) == NULL_TREE)
3878 CLASSTYPE_REF_FIELDS_NEED_INIT (t) = 1;
3880 /* ARM $12.6.2: [A member initializer list] (or, for an
3881 aggregate, initialization by a brace-enclosed list) is the
3882 only way to initialize nonstatic const and reference
3884 *cant_have_default_ctor_p = 1;
3885 TYPE_HAS_COMPLEX_ASSIGN_REF (t) = 1;
3887 if (! TYPE_HAS_CONSTRUCTOR (t) && extra_warnings)
3890 cp_warning_at ("non-static reference `%#D' in class without a constructor", x);
3892 cp_warning_at ("non-static reference in class without a constructor", x);
3896 type = strip_array_types (type);
3898 if (TREE_CODE (type) == POINTER_TYPE)
3901 if (DECL_MUTABLE_P (x) || TYPE_HAS_MUTABLE_P (type))
3902 CLASSTYPE_HAS_MUTABLE (t) = 1;
3904 if (! pod_type_p (type)
3905 /* For some reason, pointers to members are POD types themselves,
3906 but are not allowed in POD structs. Silly. */
3907 || TYPE_PTRMEM_P (type) || TYPE_PTRMEMFUNC_P (type))
3908 CLASSTYPE_NON_POD_P (t) = 1;
3910 /* If any field is const, the structure type is pseudo-const. */
3911 if (CP_TYPE_CONST_P (type))
3913 C_TYPE_FIELDS_READONLY (t) = 1;
3914 if (DECL_INITIAL (x) == NULL_TREE)
3915 CLASSTYPE_READONLY_FIELDS_NEED_INIT (t) = 1;
3917 /* ARM $12.6.2: [A member initializer list] (or, for an
3918 aggregate, initialization by a brace-enclosed list) is the
3919 only way to initialize nonstatic const and reference
3921 *cant_have_default_ctor_p = 1;
3922 TYPE_HAS_COMPLEX_ASSIGN_REF (t) = 1;
3924 if (! TYPE_HAS_CONSTRUCTOR (t) && extra_warnings)
3927 cp_warning_at ("non-static const member `%#D' in class without a constructor", x);
3929 cp_warning_at ("non-static const member in class without a constructor", x);
3932 /* A field that is pseudo-const makes the structure likewise. */
3933 else if (IS_AGGR_TYPE (type))
3935 C_TYPE_FIELDS_READONLY (t) |= C_TYPE_FIELDS_READONLY (type);
3936 CLASSTYPE_READONLY_FIELDS_NEED_INIT (t)
3937 |= CLASSTYPE_READONLY_FIELDS_NEED_INIT (type);
3940 /* We set DECL_C_BIT_FIELD in grokbitfield.
3941 If the type and width are valid, we'll also set DECL_BIT_FIELD. */
3942 if (DECL_C_BIT_FIELD (x))
3943 check_bitfield_decl (x);
3945 check_field_decl (x, t,
3946 cant_have_const_ctor_p,
3947 cant_have_default_ctor_p,
3949 &any_default_members);
3952 /* Effective C++ rule 11. */
3953 if (has_pointers && warn_ecpp && TYPE_HAS_CONSTRUCTOR (t)
3954 && ! (TYPE_HAS_INIT_REF (t) && TYPE_HAS_ASSIGN_REF (t)))
3956 cp_warning ("`%#T' has pointer data members", t);
3958 if (! TYPE_HAS_INIT_REF (t))
3960 cp_warning (" but does not override `%T(const %T&)'", t, t);
3961 if (! TYPE_HAS_ASSIGN_REF (t))
3962 cp_warning (" or `operator=(const %T&)'", t);
3964 else if (! TYPE_HAS_ASSIGN_REF (t))
3965 cp_warning (" but does not override `operator=(const %T&)'", t);
3969 /* Check anonymous struct/anonymous union fields. */
3970 finish_struct_anon (t);
3972 /* We've built up the list of access declarations in reverse order.
3974 *access_decls = nreverse (*access_decls);
3977 /* Return a FIELD_DECL for a pointer-to-virtual-table or
3978 pointer-to-virtual-base. The NAME, ASSEMBLER_NAME, and TYPE of the
3979 field are as indicated. The CLASS_TYPE in which this field occurs
3980 is also indicated. FCONTEXT is the type that is needed for the debug
3981 info output routines. *EMPTY_P is set to a non-zero value by this
3982 function to indicate that a class containing this field is
3986 build_vtbl_or_vbase_field (name, assembler_name, type, class_type, fcontext,
3989 tree assembler_name;
3997 /* This class is non-empty. */
4000 /* Build the FIELD_DECL. */
4001 field = build_lang_decl (FIELD_DECL, name, type);
4002 DECL_ASSEMBLER_NAME (field) = assembler_name;
4003 DECL_VIRTUAL_P (field) = 1;
4004 DECL_ARTIFICIAL (field) = 1;
4005 DECL_FIELD_CONTEXT (field) = class_type;
4006 DECL_FCONTEXT (field) = fcontext;
4007 DECL_SAVED_INSNS (field) = 0;
4008 DECL_FIELD_SIZE (field) = 0;
4009 DECL_ALIGN (field) = TYPE_ALIGN (type);
4015 /* If the empty base field in DECL overlaps with a base of the same type in
4016 NEWDECL, which is either another base field or the first data field of
4017 the class, pad the base just before NEWDECL and return 1. Otherwise,
4021 avoid_overlap (decl, newdecl, empty_p)
4027 if (newdecl == NULL_TREE
4028 || ! types_overlap_p (TREE_TYPE (decl), TREE_TYPE (newdecl)))
4031 for (field = decl; TREE_CHAIN (field) && TREE_CHAIN (field) != newdecl;
4032 field = TREE_CHAIN (field))
4035 DECL_SIZE (field) = integer_one_node;
4036 /* The containing class cannot be empty; this field takes up space. */
4042 /* Build a FIELD_DECL for the base given by BINFO in T. If the new
4043 object is non-empty, clear *EMPTY_P. Otherwise, set *SAW_EMPTY_P.
4044 *BASE_ALIGN is a running maximum of the alignments of any base
4048 build_base_field (t, binfo, empty_p, saw_empty_p, base_align)
4053 unsigned int *base_align;
4055 tree basetype = BINFO_TYPE (binfo);
4058 if (TYPE_SIZE (basetype) == 0)
4059 /* This error is now reported in xref_tag, thus giving better
4060 location information. */
4063 decl = build_lang_decl (FIELD_DECL, NULL_TREE, basetype);
4064 DECL_ARTIFICIAL (decl) = 1;
4065 DECL_FIELD_CONTEXT (decl) = t;
4066 DECL_SIZE (decl) = CLASSTYPE_SIZE (basetype);
4067 DECL_ALIGN (decl) = CLASSTYPE_ALIGN (basetype);
4069 if (flag_new_abi && DECL_SIZE (decl) == integer_zero_node)
4075 /* The containing class is non-empty because it has a non-empty base
4081 /* Brain damage for backwards compatibility. For no good
4082 reason, the old layout_basetypes made every base at least
4083 as large as the alignment for the bases up to that point,
4084 gratuitously wasting space. So we do the same thing
4086 *base_align = MAX (*base_align, DECL_ALIGN (decl));
4088 = size_int (MAX (TREE_INT_CST_LOW (DECL_SIZE (decl)),
4089 (int) (*base_align)));
4095 /* Returns a list of fields to stand in for the base class subobjects
4096 of REC. These fields are later removed by layout_basetypes. */
4099 build_base_fields (rec, empty_p)
4103 /* Chain to hold all the new FIELD_DECLs which stand in for base class
4105 tree base_decls = NULL_TREE;
4106 int n_baseclasses = CLASSTYPE_N_BASECLASSES (rec);
4107 tree decl, nextdecl;
4108 int i, saw_empty = 0;
4109 unsigned int base_align = 0;
4111 /* Under the new ABI, the primary base class is always allocated
4113 if (flag_new_abi && CLASSTYPE_HAS_PRIMARY_BASE_P (rec))
4117 primary_base = CLASSTYPE_PRIMARY_BINFO (rec);
4118 base_decls = chainon (build_base_field (rec,
4126 /* Now allocate the rest of the bases. */
4127 for (i = 0; i < n_baseclasses; ++i)
4131 /* Under the new ABI, the primary base was already allocated
4132 above, so we don't need to allocate it again here. */
4133 if (flag_new_abi && i == CLASSTYPE_VFIELD_PARENT (rec))
4136 base_binfo = BINFO_BASETYPE (TYPE_BINFO (rec), i);
4138 /* A primary virtual base class is allocated just like any other
4139 base class, but a non-primary virtual base is allocated
4140 later, in layout_basetypes. */
4141 if (TREE_VIA_VIRTUAL (base_binfo)
4142 && !BINFO_PRIMARY_MARKED_P (base_binfo))
4145 base_decls = chainon (build_base_field (rec, base_binfo,
4152 /* Reverse the list of fields so we allocate the bases in the proper
4154 base_decls = nreverse (base_decls);
4156 /* In the presence of empty base classes, we run the risk of allocating
4157 two objects of the same class on top of one another. Avoid that. */
4158 if (flag_new_abi && saw_empty)
4159 for (decl = base_decls; decl; decl = TREE_CHAIN (decl))
4161 if (DECL_SIZE (decl) == integer_zero_node)
4163 /* First step through the following bases until we find
4164 an overlap or a non-empty base. */
4165 for (nextdecl = TREE_CHAIN (decl); nextdecl;
4166 nextdecl = TREE_CHAIN (nextdecl))
4168 if (avoid_overlap (decl, nextdecl, empty_p)
4169 || DECL_SIZE (nextdecl) != integer_zero_node)
4173 /* If we're still looking, also check against the first
4175 for (nextdecl = TYPE_FIELDS (rec);
4176 nextdecl && TREE_CODE (nextdecl) != FIELD_DECL;
4177 nextdecl = TREE_CHAIN (nextdecl))
4179 avoid_overlap (decl, nextdecl, empty_p);
4187 /* Go through the TYPE_METHODS of T issuing any appropriate
4188 diagnostics, figuring out which methods override which other
4189 methods, and so forth. */
4197 for (x = TYPE_METHODS (t); x; x = TREE_CHAIN (x))
4199 GNU_xref_member (current_class_name, x);
4201 /* If this was an evil function, don't keep it in class. */
4202 if (IDENTIFIER_ERROR_LOCUS (DECL_ASSEMBLER_NAME (x)))
4205 /* Do both of these, even though they're in the same union;
4206 if the insn `r' member and the size `i' member are
4207 different sizes, as on the alpha, the larger of the two
4208 will end up with garbage in it. */
4209 DECL_SAVED_INSNS (x) = 0;
4210 DECL_FIELD_SIZE (x) = 0;
4212 check_for_override (x, t);
4213 if (DECL_PURE_VIRTUAL_P (x) && ! DECL_VINDEX (x))
4214 cp_error_at ("initializer specified for non-virtual method `%D'", x);
4216 /* The name of the field is the original field name
4217 Save this in auxiliary field for later overloading. */
4218 if (DECL_VINDEX (x))
4220 TYPE_POLYMORPHIC_P (t) = 1;
4221 if (DECL_PURE_VIRTUAL_P (x))
4222 CLASSTYPE_PURE_VIRTUALS (t)
4223 = tree_cons (NULL_TREE, x, CLASSTYPE_PURE_VIRTUALS (t));
4228 /* Remove all zero-width bit-fields from T. */
4231 remove_zero_width_bit_fields (t)
4236 fieldsp = &TYPE_FIELDS (t);
4239 if (TREE_CODE (*fieldsp) == FIELD_DECL
4240 && DECL_C_BIT_FIELD (*fieldsp)
4241 && DECL_INITIAL (*fieldsp))
4242 *fieldsp = TREE_CHAIN (*fieldsp);
4244 fieldsp = &TREE_CHAIN (*fieldsp);
4248 /* Check the validity of the bases and members declared in T. Add any
4249 implicitly-generated functions (like copy-constructors and
4250 assignment operators). Compute various flag bits (like
4251 CLASSTYPE_NON_POD_T) for T. This routine works purely at the C++
4252 level: i.e., independently of the ABI in use. */
4255 check_bases_and_members (t, empty_p)
4259 /* Nonzero if we are not allowed to generate a default constructor
4261 int cant_have_default_ctor;
4262 /* Nonzero if the implicitly generated copy constructor should take
4263 a non-const reference argument. */
4264 int cant_have_const_ctor;
4265 /* Nonzero if the the implicitly generated assignment operator
4266 should take a non-const reference argument. */
4267 int no_const_asn_ref;
4270 /* By default, we use const reference arguments and generate default
4272 cant_have_default_ctor = 0;
4273 cant_have_const_ctor = 0;
4274 no_const_asn_ref = 0;
4276 /* Assume that the class is nearly empty; we'll clear this flag if
4277 it turns out not to be nearly empty. */
4278 CLASSTYPE_NEARLY_EMPTY_P (t) = 1;
4280 /* Check all the base-classes. */
4281 check_bases (t, &cant_have_default_ctor, &cant_have_const_ctor,
4284 /* Check all the data member declarations. */
4285 check_field_decls (t, &access_decls, empty_p,
4286 &cant_have_default_ctor,
4287 &cant_have_const_ctor,
4290 /* Check all the method declarations. */
4293 /* A nearly-empty class has to be vptr-containing; a nearly empty
4294 class contains just a vptr. */
4295 if (!TYPE_CONTAINS_VPTR_P (t))
4296 CLASSTYPE_NEARLY_EMPTY_P (t) = 0;
4298 /* Do some bookkeeping that will guide the generation of implicitly
4299 declared member functions. */
4300 TYPE_HAS_COMPLEX_INIT_REF (t)
4301 |= (TYPE_HAS_INIT_REF (t)
4302 || TYPE_USES_VIRTUAL_BASECLASSES (t)
4303 || TYPE_POLYMORPHIC_P (t));
4304 TYPE_NEEDS_CONSTRUCTING (t)
4305 |= (TYPE_HAS_CONSTRUCTOR (t)
4306 || TYPE_USES_VIRTUAL_BASECLASSES (t)
4307 || TYPE_POLYMORPHIC_P (t));
4308 CLASSTYPE_NON_AGGREGATE (t) |= (TYPE_HAS_CONSTRUCTOR (t)
4309 || TYPE_POLYMORPHIC_P (t));
4310 CLASSTYPE_NON_POD_P (t)
4311 |= (CLASSTYPE_NON_AGGREGATE (t) || TYPE_HAS_DESTRUCTOR (t)
4312 || TYPE_HAS_ASSIGN_REF (t));
4313 TYPE_HAS_REAL_ASSIGN_REF (t) |= TYPE_HAS_ASSIGN_REF (t);
4314 TYPE_HAS_COMPLEX_ASSIGN_REF (t)
4315 |= TYPE_HAS_ASSIGN_REF (t) || TYPE_USES_VIRTUAL_BASECLASSES (t);
4317 /* Synthesize any needed methods. Note that methods will be synthesized
4318 for anonymous unions; grok_x_components undoes that. */
4319 add_implicitly_declared_members (t, cant_have_default_ctor,
4320 cant_have_const_ctor,
4323 /* Build and sort the CLASSTYPE_METHOD_VEC. */
4324 finish_struct_methods (t);
4326 /* Process the access-declarations. We wait until now to do this
4327 because handle_using_decls requires that the CLASSTYPE_METHOD_VEC
4328 be set up correctly. */
4329 while (access_decls)
4331 handle_using_decl (TREE_VALUE (access_decls), t);
4332 access_decls = TREE_CHAIN (access_decls);
4336 /* If T needs a pointer to its virtual function table, set TYPE_VFIELD
4337 accordingly, and, if necessary, add the TYPE_VFIELD to the
4338 TYPE_FIELDS list. */
4341 create_vtable_ptr (t, empty_p, has_virtual_p,
4342 new_virtuals_p, overridden_virtuals_p)
4346 tree *new_virtuals_p;
4347 tree *overridden_virtuals_p;
4351 /* Loop over the virtual functions, adding them to our various
4353 for (fn = TYPE_METHODS (t); fn; fn = TREE_CHAIN (fn))
4354 if (DECL_VINDEX (fn))
4355 add_virtual_function (new_virtuals_p, overridden_virtuals_p,
4356 has_virtual_p, fn, t);
4358 /* Even if there weren't any new virtual functions, we might need a
4359 new virtual function table if we're supposed to include vptrs in
4360 all classes that need them. */
4361 if (TYPE_CONTAINS_VPTR_P (t) && vptrs_present_everywhere_p ())
4362 start_vtable (t, has_virtual_p);
4364 /* If we couldn't find an appropriate base class, create a new field
4366 if (*has_virtual_p && !TYPE_VFIELD (t))
4368 /* We build this decl with vtbl_ptr_type_node, which is a
4369 `vtable_entry_type*'. It might seem more precise to use
4370 `vtable_entry_type (*)[N]' where N is the number of firtual
4371 functions. However, that would require the vtable pointer in
4372 base classes to have a different type than the vtable pointer
4373 in derived classes. We could make that happen, but that
4374 still wouldn't solve all the problems. In particular, the
4375 type-based alias analysis code would decide that assignments
4376 to the base class vtable pointer can't alias assignments to
4377 the derived class vtable pointer, since they have different
4378 types. Thus, in an derived class destructor, where the base
4379 class constructor was inlined, we could generate bad code for
4380 setting up the vtable pointer.
4382 Therefore, we use one type for all vtable pointers. We still
4383 use a type-correct type; it's just doesn't indicate the array
4384 bounds. That's better than using `void*' or some such; it's
4385 cleaner, and it let's the alias analysis code know that these
4386 stores cannot alias stores to void*! */
4388 = build_vtbl_or_vbase_field (get_vfield_name (t),
4389 get_identifier (VFIELD_BASE),
4395 /* Add the new field to the list of fields in this class. */
4397 /* In the old ABI, the vtable pointer goes at the end of the
4399 TYPE_FIELDS (t) = chainon (TYPE_FIELDS (t), TYPE_VFIELD (t));
4402 /* But in the new ABI, the vtable pointer is the first thing
4404 TYPE_FIELDS (t) = chainon (TYPE_VFIELD (t), TYPE_FIELDS (t));
4405 /* If there were any baseclasses, they can't possibly be at
4406 offset zero any more, because that's where the vtable
4407 pointer is. So, converting to a base class is going to
4409 if (CLASSTYPE_N_BASECLASSES (t))
4410 TYPE_BASE_CONVS_MAY_REQUIRE_CODE_P (t) = 1;
4413 /* We can't yet add this new field to the list of all virtual
4414 function table pointers in this class. The
4415 modify_all_vtables function depends on this not being done.
4416 So, it is done later, in finish_struct_1. */
4420 /* Fixup the inline function given by INFO now that the class is
4424 fixup_pending_inline (info)
4425 struct pending_inline *info;
4430 tree fn = info->fndecl;
4432 args = DECL_ARGUMENTS (fn);
4435 DECL_CONTEXT (args) = fn;
4436 args = TREE_CHAIN (args);
4441 /* Fixup the inline methods and friends in TYPE now that TYPE is
4445 fixup_inline_methods (type)
4448 tree method = TYPE_METHODS (type);
4450 if (method && TREE_CODE (method) == TREE_VEC)
4452 if (TREE_VEC_ELT (method, 1))
4453 method = TREE_VEC_ELT (method, 1);
4454 else if (TREE_VEC_ELT (method, 0))
4455 method = TREE_VEC_ELT (method, 0);
4457 method = TREE_VEC_ELT (method, 2);
4460 /* Do inline member functions. */
4461 for (; method; method = TREE_CHAIN (method))
4462 fixup_pending_inline (DECL_PENDING_INLINE_INFO (method));
4465 for (method = CLASSTYPE_INLINE_FRIENDS (type);
4467 method = TREE_CHAIN (method))
4468 fixup_pending_inline (DECL_PENDING_INLINE_INFO (TREE_VALUE (method)));
4469 CLASSTYPE_INLINE_FRIENDS (type) = NULL_TREE;
4472 /* Called from propagate_binfo_offsets via dfs_walk. */
4475 dfs_propagate_binfo_offsets (binfo, data)
4479 tree offset = (tree) data;
4481 /* Update the BINFO_OFFSET for this base. */
4482 BINFO_OFFSET (binfo)
4483 = size_binop (PLUS_EXPR, BINFO_OFFSET (binfo), offset);
4485 SET_BINFO_MARKED (binfo);
4490 /* Add OFFSET to all base types of BINFO which is a base in the
4491 hierarchy dominated by T.
4493 OFFSET, which is a type offset, is number of bytes.
4495 Note that we don't have to worry about having two paths to the
4496 same base type, since this type owns its association list. */
4499 propagate_binfo_offsets (binfo, offset)
4504 dfs_propagate_binfo_offsets,
4505 dfs_skip_nonprimary_vbases_unmarkedp,
4509 dfs_skip_nonprimary_vbases_markedp,
4513 /* Remove *FIELD (which corresponds to the base given by BINFO) from
4514 the field list for T. */
4517 remove_base_field (t, binfo, field)
4522 tree basetype = BINFO_TYPE (binfo);
4525 my_friendly_assert (TREE_TYPE (*field) == basetype, 23897);
4527 if (get_base_distance (basetype, t, 0, (tree*)0) == -2)
4528 cp_warning ("direct base `%T' inaccessible in `%T' due to ambiguity",
4532 = size_int (CEIL (TREE_INT_CST_LOW (DECL_FIELD_BITPOS (*field)),
4534 propagate_binfo_offsets (binfo, offset);
4536 /* Remove this field. */
4537 *field = TREE_CHAIN (*field);
4540 /* Remove the FIELD_DECLs created for T's base classes in
4541 build_base_fields. Simultaneously, update BINFO_OFFSET for all the
4542 bases, except for non-primary virtual baseclasses. */
4545 remove_base_fields (t)
4551 /* Now propagate offset information throughout the lattice.
4552 Simultaneously, remove the temporary FIELD_DECLS we created in
4553 build_base_fields to refer to base types. */
4554 field = &TYPE_FIELDS (t);
4555 if (TYPE_VFIELD (t) == *field)
4557 /* If this class did not have a primary base, we create a
4558 virtual function table pointer. It will be the first thing
4559 in the class, under the new ABI. Skip it; the base fields
4561 my_friendly_assert (flag_new_abi
4562 && !CLASSTYPE_HAS_PRIMARY_BASE_P (t),
4564 field = &TREE_CHAIN (*field);
4567 /* Under the new ABI, the primary base is always allocated first. */
4568 if (flag_new_abi && CLASSTYPE_HAS_PRIMARY_BASE_P (t))
4569 remove_base_field (t, CLASSTYPE_PRIMARY_BINFO (t), field);
4571 /* Now remove the rest of the bases. */
4572 for (i = 0; i < CLASSTYPE_N_BASECLASSES (t); i++)
4576 /* Under the new ABI, we've already removed the primary base
4578 if (flag_new_abi && i == CLASSTYPE_VFIELD_PARENT (t))
4581 binfo = BINFO_BASETYPE (TYPE_BINFO (t), i);
4583 /* We treat a primary virtual base class just like an ordinary base
4584 class. But, non-primary virtual bases are laid out later. */
4585 if (TREE_VIA_VIRTUAL (binfo) && !BINFO_PRIMARY_MARKED_P (binfo))
4588 remove_base_field (t, binfo, field);
4592 /* Called via dfs_walk from layout_virtual bases. */
4595 dfs_set_offset_for_shared_vbases (binfo, data)
4599 if (TREE_VIA_VIRTUAL (binfo) && BINFO_PRIMARY_MARKED_P (binfo))
4601 /* Update the shared copy. */
4604 shared_binfo = BINFO_FOR_VBASE (BINFO_TYPE (binfo), (tree) data);
4605 BINFO_OFFSET (shared_binfo) = BINFO_OFFSET (binfo);
4611 /* Called via dfs_walk from layout_virtual bases. */
4614 dfs_set_offset_for_unshared_vbases (binfo, data)
4618 /* If this is a virtual base, make sure it has the same offset as
4619 the shared copy. If it's a primary base, then we know it's
4621 if (TREE_VIA_VIRTUAL (binfo) && !BINFO_PRIMARY_MARKED_P (binfo))
4623 tree t = (tree) data;
4627 vbase = BINFO_FOR_VBASE (BINFO_TYPE (binfo), t);
4628 offset = ssize_binop (MINUS_EXPR,
4629 BINFO_OFFSET (vbase),
4630 BINFO_OFFSET (binfo));
4631 propagate_binfo_offsets (binfo, offset);
4637 /* Set BINFO_OFFSET for all of the virtual bases for T. Update
4638 TYPE_ALIGN and TYPE_SIZE for T. */
4641 layout_virtual_bases (t)
4647 /* DSIZE is the size of the class without the virtual bases. */
4648 dsize = TREE_INT_CST_LOW (TYPE_SIZE (t));
4649 /* Make every class have alignment of at least one. */
4650 TYPE_ALIGN (t) = MAX (TYPE_ALIGN (t), BITS_PER_UNIT);
4652 /* Go through the virtual bases, allocating space for each virtual
4653 base that is not already a primary base class. */
4654 for (vbase = CLASSTYPE_VBASECLASSES (t);
4656 vbase = TREE_CHAIN (vbase))
4657 if (!BINFO_VBASE_PRIMARY_P (vbase))
4659 /* This virtual base is not a primary base of any class in the
4660 hierarchy, so we have to add space for it. */
4662 unsigned int desired_align;
4664 basetype = BINFO_TYPE (vbase);
4665 desired_align = TYPE_ALIGN (basetype);
4666 TYPE_ALIGN (t) = MAX (TYPE_ALIGN (t), desired_align);
4668 /* Add padding so that we can put the virtual base class at an
4669 appropriately aligned offset. */
4670 dsize = CEIL (dsize, desired_align) * desired_align;
4671 /* And compute the offset of the virtual base. */
4672 propagate_binfo_offsets (vbase,
4673 size_int (CEIL (dsize, BITS_PER_UNIT)));
4674 /* Every virtual baseclass takes a least a UNIT, so that we can
4675 take it's address and get something different for each base. */
4676 dsize += MAX (BITS_PER_UNIT,
4677 TREE_INT_CST_LOW (CLASSTYPE_SIZE (basetype)));
4680 /* Make sure that all of the CLASSTYPE_VBASECLASSES have their
4681 BINFO_OFFSET set correctly. Those we just allocated certainly
4682 will. The others are primary baseclasses; we walk the hierarchy
4683 to find the primary copies and update the shared copy. */
4684 dfs_walk (TYPE_BINFO (t),
4685 dfs_set_offset_for_shared_vbases,
4686 dfs_unmarked_real_bases_queue_p,
4689 /* Now, go through the TYPE_BINFO hierarchy again, setting the
4690 BINFO_OFFSETs correctly for all non-primary copies of the virtual
4691 bases and their direct and indirect bases. The ambiguity checks
4692 in get_base_distance depend on the BINFO_OFFSETs being set
4694 dfs_walk (TYPE_BINFO (t), dfs_set_offset_for_unshared_vbases, NULL, t);
4695 for (vbase = CLASSTYPE_VBASECLASSES (t);
4697 vbase = TREE_CHAIN (vbase))
4698 dfs_walk (vbase, dfs_set_offset_for_unshared_vbases, NULL, t);
4700 /* Now, make sure that the total size of the type is a multiple of
4702 dsize = CEIL (dsize, TYPE_ALIGN (t)) * TYPE_ALIGN (t);
4703 TYPE_SIZE (t) = size_int (dsize);
4704 TYPE_SIZE_UNIT (t) = size_binop (FLOOR_DIV_EXPR, TYPE_SIZE (t),
4705 size_int (BITS_PER_UNIT));
4708 /* Finish the work of layout_record, now taking virtual bases into account.
4709 Also compute the actual offsets that our base classes will have.
4710 This must be performed after the fields are laid out, since virtual
4711 baseclasses must lay down at the end of the record. */
4714 layout_basetypes (rec)
4719 #ifdef STRUCTURE_SIZE_BOUNDARY
4720 /* Packed structures don't need to have minimum size. */
4721 if (! TYPE_PACKED (rec))
4722 TYPE_ALIGN (rec) = MAX (TYPE_ALIGN (rec), STRUCTURE_SIZE_BOUNDARY);
4725 /* Remove the FIELD_DECLs we created for baseclasses in
4726 build_base_fields. Simultaneously, update the BINFO_OFFSETs for
4727 everything in the hierarcy except non-primary virtual bases. */
4728 remove_base_fields (rec);
4730 /* Allocate the virtual base classes. */
4731 layout_virtual_bases (rec);
4733 /* Get all the virtual base types that this type uses. The
4734 TREE_VALUE slot holds the virtual baseclass type. Note that
4735 get_vbase_types makes copies of the virtual base BINFOs, so that
4736 the vbase_types are unshared. */
4737 for (vbase_types = CLASSTYPE_VBASECLASSES (rec); vbase_types;
4738 vbase_types = TREE_CHAIN (vbase_types))
4741 tree basetype = BINFO_TYPE (vbase_types);
4742 if (get_base_distance (basetype, rec, 0, (tree*)0) == -2)
4743 cp_warning ("virtual base `%T' inaccessible in `%T' due to ambiguity",
4748 /* Calculate the TYPE_SIZE, TYPE_ALIGN, etc for T. Calculate
4749 BINFO_OFFSETs for all of the base-classes. Position the vtable
4753 layout_class_type (t, empty_p, has_virtual_p,
4754 new_virtuals_p, overridden_virtuals_p)
4758 tree *new_virtuals_p;
4759 tree *overridden_virtuals_p;
4761 tree padding = NULL_TREE;
4763 /* If possible, we reuse the virtual function table pointer from one
4764 of our base classes. */
4765 determine_primary_base (t, has_virtual_p);
4767 /* Add pointers to all of our virtual base-classes. */
4768 TYPE_FIELDS (t) = chainon (build_vbase_pointer_fields (t, empty_p),
4770 /* Build FIELD_DECLs for all of the non-virtual base-types. */
4771 TYPE_FIELDS (t) = chainon (build_base_fields (t, empty_p),
4774 /* Create a pointer to our virtual function table. */
4775 create_vtable_ptr (t, empty_p, has_virtual_p,
4776 new_virtuals_p, overridden_virtuals_p);
4778 /* CLASSTYPE_INLINE_FRIENDS is really TYPE_NONCOPIED_PARTS. Thus,
4779 we have to save this before we start modifying
4780 TYPE_NONCOPIED_PARTS. */
4781 fixup_inline_methods (t);
4783 /* We make all structures have at least one element, so that they
4784 have non-zero size. The field that we add here is fake, in the
4785 sense that, for example, we don't want people to be able to
4786 initialize it later. So, we add it just long enough to let the
4787 back-end lay out the type, and then remove it. In the new ABI,
4788 the class may be empty even if it has basetypes. Therefore, we
4789 add the fake field at the end of the fields list; if there are
4790 already FIELD_DECLs on the list, their offsets will not be
4794 padding = build_lang_decl (FIELD_DECL, NULL_TREE, char_type_node);
4795 TYPE_FIELDS (t) = chainon (TYPE_FIELDS (t), padding);
4796 TYPE_NONCOPIED_PARTS (t)
4797 = tree_cons (NULL_TREE, padding, TYPE_NONCOPIED_PARTS (t));
4798 TREE_STATIC (TYPE_NONCOPIED_PARTS (t)) = 1;
4801 /* Let the back-end lay out the type. Note that at this point we
4802 have only included non-virtual base-classes; we will lay out the
4803 virtual base classes later. So, the TYPE_SIZE/TYPE_ALIGN after
4804 this call are not necessarily correct; they are just the size and
4805 alignment when no virtual base clases are used. */
4808 /* If we added an extra field to make this class non-empty, remove
4814 declp = &TYPE_FIELDS (t);
4815 while (*declp != padding)
4816 declp = &TREE_CHAIN (*declp);
4817 *declp = TREE_CHAIN (*declp);
4820 /* Delete all zero-width bit-fields from the list of fields. Now
4821 that the type is laid out they are no longer important. */
4822 remove_zero_width_bit_fields (t);
4824 /* Remember the size and alignment of the class before adding
4825 the virtual bases. */
4826 if (*empty_p && flag_new_abi)
4827 CLASSTYPE_SIZE (t) = integer_zero_node;
4828 else if (flag_new_abi && TYPE_HAS_COMPLEX_INIT_REF (t)
4829 && TYPE_HAS_COMPLEX_ASSIGN_REF (t))
4830 CLASSTYPE_SIZE (t) = TYPE_BINFO_SIZE (t);
4832 CLASSTYPE_SIZE (t) = TYPE_SIZE (t);
4833 CLASSTYPE_ALIGN (t) = TYPE_ALIGN (t);
4835 /* Set the TYPE_DECL for this type to contain the right
4836 value for DECL_OFFSET, so that we can use it as part
4837 of a COMPONENT_REF for multiple inheritance. */
4838 layout_decl (TYPE_MAIN_DECL (t), 0);
4840 /* Now fix up any virtual base class types that we left lying
4841 around. We must get these done before we try to lay out the
4842 virtual function table. */
4843 if (CLASSTYPE_N_BASECLASSES (t))
4844 /* layout_basetypes will remove the base subobject fields. */
4845 layout_basetypes (t);
4848 /* Create a RECORD_TYPE or UNION_TYPE node for a C struct or union declaration
4849 (or C++ class declaration).
4851 For C++, we must handle the building of derived classes.
4852 Also, C++ allows static class members. The way that this is
4853 handled is to keep the field name where it is (as the DECL_NAME
4854 of the field), and place the overloaded decl in the DECL_FIELD_BITPOS
4855 of the field. layout_record and layout_union will know about this.
4857 More C++ hair: inline functions have text in their
4858 DECL_PENDING_INLINE_INFO nodes which must somehow be parsed into
4859 meaningful tree structure. After the struct has been laid out, set
4860 things up so that this can happen.
4862 And still more: virtual functions. In the case of single inheritance,
4863 when a new virtual function is seen which redefines a virtual function
4864 from the base class, the new virtual function is placed into
4865 the virtual function table at exactly the same address that
4866 it had in the base class. When this is extended to multiple
4867 inheritance, the same thing happens, except that multiple virtual
4868 function tables must be maintained. The first virtual function
4869 table is treated in exactly the same way as in the case of single
4870 inheritance. Additional virtual function tables have different
4871 DELTAs, which tell how to adjust `this' to point to the right thing.
4873 ATTRIBUTES is the set of decl attributes to be applied, if any. */
4881 /* The NEW_VIRTUALS is a TREE_LIST. The TREE_VALUE of each node is
4882 a FUNCTION_DECL. Each of these functions is a virtual function
4883 declared in T that does not override any virtual function from a
4885 tree new_virtuals = NULL_TREE;
4886 /* The OVERRIDDEN_VIRTUALS list is like the NEW_VIRTUALS list,
4887 except that each declaration here overrides the declaration from
4889 tree overridden_virtuals = NULL_TREE;
4896 if (IS_AGGR_TYPE (t))
4897 cp_error ("redefinition of `%#T'", t);
4899 my_friendly_abort (172);
4904 GNU_xref_decl (current_function_decl, t);
4906 /* If this type was previously laid out as a forward reference,
4907 make sure we lay it out again. */
4908 TYPE_SIZE (t) = NULL_TREE;
4909 CLASSTYPE_GOT_SEMICOLON (t) = 0;
4910 CLASSTYPE_VFIELD_PARENT (t) = -1;
4912 CLASSTYPE_RTTI (t) = NULL_TREE;
4914 /* Do end-of-class semantic processing: checking the validity of the
4915 bases and members and add implicitly generated methods. */
4916 check_bases_and_members (t, &empty);
4918 /* Layout the class itself. */
4919 layout_class_type (t, &empty, &has_virtual,
4920 &new_virtuals, &overridden_virtuals);
4922 /* Set up the DECL_FIELD_BITPOS of the vfield if we need to, as we
4923 might need to know it for setting up the offsets in the vtable
4924 (or in thunks) below. */
4925 vfield = TYPE_VFIELD (t);
4926 if (vfield != NULL_TREE
4927 && DECL_FIELD_CONTEXT (vfield) != t)
4929 tree binfo = get_binfo (DECL_FIELD_CONTEXT (vfield), t, 0);
4930 tree offset = BINFO_OFFSET (binfo);
4932 vfield = copy_node (vfield);
4933 copy_lang_decl (vfield);
4935 if (! integer_zerop (offset))
4936 offset = size_binop (MULT_EXPR, offset, size_int (BITS_PER_UNIT));
4937 DECL_FIELD_CONTEXT (vfield) = t;
4938 DECL_FIELD_BITPOS (vfield)
4939 = size_binop (PLUS_EXPR, offset, DECL_FIELD_BITPOS (vfield));
4940 TYPE_VFIELD (t) = vfield;
4944 = modify_all_vtables (t, &has_virtual, nreverse (overridden_virtuals));
4946 /* If necessary, create the primary vtable for this class. */
4948 || overridden_virtuals
4949 || (TYPE_CONTAINS_VPTR_P (t) && vptrs_present_everywhere_p ()))
4951 new_virtuals = nreverse (new_virtuals);
4952 /* We must enter these virtuals into the table. */
4953 if (!CLASSTYPE_HAS_PRIMARY_BASE_P (t))
4955 if (! CLASSTYPE_COM_INTERFACE (t))
4957 /* The second slot is for the tdesc pointer when thunks
4959 if (flag_vtable_thunks)
4960 new_virtuals = tree_cons (NULL_TREE, NULL_TREE, new_virtuals);
4962 /* The first slot is for the rtti offset. */
4963 new_virtuals = tree_cons (NULL_TREE, NULL_TREE, new_virtuals);
4965 set_rtti_entry (new_virtuals,
4966 convert (ssizetype, integer_zero_node), t);
4968 build_primary_vtable (NULL_TREE, t);
4970 else if (! BINFO_NEW_VTABLE_MARKED (TYPE_BINFO (t)))
4971 /* Here we know enough to change the type of our virtual
4972 function table, but we will wait until later this function. */
4973 build_primary_vtable (CLASSTYPE_PRIMARY_BINFO (t), t);
4975 /* If this type has basetypes with constructors, then those
4976 constructors might clobber the virtual function table. But
4977 they don't if the derived class shares the exact vtable of the base
4980 CLASSTYPE_NEEDS_VIRTUAL_REINIT (t) = 1;
4982 /* If we didn't need a new vtable, see if we should copy one from
4984 else if (CLASSTYPE_HAS_PRIMARY_BASE_P (t))
4986 tree binfo = CLASSTYPE_PRIMARY_BINFO (t);
4988 /* This class contributes nothing new to the virtual function
4989 table. However, it may have declared functions which
4990 went into the virtual function table "inherited" from the
4991 base class. If so, we grab a copy of those updated functions,
4992 and pretend they are ours. */
4994 /* See if we should steal the virtual info from base class. */
4995 if (TYPE_BINFO_VTABLE (t) == NULL_TREE)
4996 TYPE_BINFO_VTABLE (t) = BINFO_VTABLE (binfo);
4997 if (TYPE_BINFO_VIRTUALS (t) == NULL_TREE)
4998 TYPE_BINFO_VIRTUALS (t) = BINFO_VIRTUALS (binfo);
4999 if (TYPE_BINFO_VTABLE (t) != BINFO_VTABLE (binfo))
5000 CLASSTYPE_NEEDS_VIRTUAL_REINIT (t) = 1;
5003 if (TYPE_CONTAINS_VPTR_P (t))
5005 if (TYPE_BINFO_VTABLE (t))
5006 my_friendly_assert (DECL_VIRTUAL_P (TYPE_BINFO_VTABLE (t)),
5008 if (!CLASSTYPE_HAS_PRIMARY_BASE_P (t))
5009 my_friendly_assert (TYPE_BINFO_VIRTUALS (t) == NULL_TREE,
5012 CLASSTYPE_VSIZE (t) = has_virtual;
5013 /* Entries for virtual functions defined in the primary base are
5014 followed by entries for new functions unique to this class. */
5015 TYPE_BINFO_VIRTUALS (t)
5016 = chainon (TYPE_BINFO_VIRTUALS (t), new_virtuals);
5017 /* Finally, add entries for functions that override virtuals
5018 from non-primary bases. */
5019 TYPE_BINFO_VIRTUALS (t)
5020 = chainon (TYPE_BINFO_VIRTUALS (t), overridden_virtuals);
5023 /* Now lay out the virtual function table. */
5025 layout_vtable_decl (TYPE_BINFO (t), has_virtual);
5027 /* If we created a new vtbl pointer for this class, add it to the
5029 if (TYPE_VFIELD (t) && CLASSTYPE_VFIELD_PARENT (t) == -1)
5030 CLASSTYPE_VFIELDS (t)
5031 = chainon (CLASSTYPE_VFIELDS (t), build_tree_list (NULL_TREE, t));
5033 finish_struct_bits (t);
5035 /* Complete the rtl for any static member objects of the type we're
5037 for (x = TYPE_FIELDS (t); x; x = TREE_CHAIN (x))
5039 if (TREE_CODE (x) == VAR_DECL && TREE_STATIC (x)
5040 && TREE_TYPE (x) == t)
5042 DECL_MODE (x) = TYPE_MODE (t);
5043 make_decl_rtl (x, NULL, 0);
5047 /* Done with FIELDS...now decide whether to sort these for
5048 faster lookups later.
5050 The C front-end only does this when n_fields > 15. We use
5051 a smaller number because most searches fail (succeeding
5052 ultimately as the search bores through the inheritance
5053 hierarchy), and we want this failure to occur quickly. */
5055 n_fields = count_fields (TYPE_FIELDS (t));
5058 tree field_vec = make_tree_vec (n_fields);
5059 add_fields_to_vec (TYPE_FIELDS (t), field_vec, 0);
5060 qsort (&TREE_VEC_ELT (field_vec, 0), n_fields, sizeof (tree),
5061 (int (*)(const void *, const void *))field_decl_cmp);
5062 if (! DECL_LANG_SPECIFIC (TYPE_MAIN_DECL (t)))
5063 retrofit_lang_decl (TYPE_MAIN_DECL (t));
5064 DECL_SORTED_FIELDS (TYPE_MAIN_DECL (t)) = field_vec;
5067 if (TYPE_HAS_CONSTRUCTOR (t))
5069 tree vfields = CLASSTYPE_VFIELDS (t);
5073 /* Mark the fact that constructor for T
5074 could affect anybody inheriting from T
5075 who wants to initialize vtables for VFIELDS's type. */
5076 if (VF_DERIVED_VALUE (vfields))
5077 TREE_ADDRESSABLE (vfields) = 1;
5078 vfields = TREE_CHAIN (vfields);
5082 if (CLASSTYPE_VSIZE (t) != 0)
5084 /* In addition to this one, all the other vfields should be listed. */
5085 /* Before that can be done, we have to have FIELD_DECLs for them, and
5086 a place to find them. */
5087 TYPE_NONCOPIED_PARTS (t)
5088 = tree_cons (default_conversion (TYPE_BINFO_VTABLE (t)),
5089 TYPE_VFIELD (t), TYPE_NONCOPIED_PARTS (t));
5091 if (warn_nonvdtor && TYPE_HAS_DESTRUCTOR (t)
5092 && DECL_VINDEX (TREE_VEC_ELT (CLASSTYPE_METHOD_VEC (t), 1)) == NULL_TREE)
5093 cp_warning ("`%#T' has virtual functions but non-virtual destructor",
5097 /* Make the rtl for any new vtables we have created, and unmark
5098 the base types we marked. */
5100 hack_incomplete_structures (t);
5102 if (warn_overloaded_virtual)
5105 maybe_suppress_debug_info (t);
5107 /* Finish debugging output for this type. */
5108 rest_of_type_compilation (t, toplevel_bindings_p ());
5111 /* When T was built up, the member declarations were added in reverse
5112 order. Rearrange them to declaration order. */
5115 unreverse_member_declarations (t)
5122 /* The TYPE_FIELDS, TYPE_METHODS, and CLASSTYPE_TAGS are all in
5123 reverse order. Put them in declaration order now. */
5124 TYPE_METHODS (t) = nreverse (TYPE_METHODS (t));
5125 CLASSTYPE_TAGS (t) = nreverse (CLASSTYPE_TAGS (t));
5127 /* Actually, for the TYPE_FIELDS, only the non TYPE_DECLs are in
5128 reverse order, so we can't just use nreverse. */
5130 for (x = TYPE_FIELDS (t);
5131 x && TREE_CODE (x) != TYPE_DECL;
5134 next = TREE_CHAIN (x);
5135 TREE_CHAIN (x) = prev;
5140 TREE_CHAIN (TYPE_FIELDS (t)) = x;
5142 TYPE_FIELDS (t) = prev;
5147 finish_struct (t, attributes)
5150 /* Now that we've got all the field declarations, reverse everything
5152 unreverse_member_declarations (t);
5154 cplus_decl_attributes (t, attributes, NULL_TREE);
5156 if (processing_template_decl)
5158 finish_struct_methods (t);
5159 TYPE_SIZE (t) = integer_zero_node;
5162 finish_struct_1 (t);
5164 TYPE_BEING_DEFINED (t) = 0;
5166 if (current_class_type)
5169 error ("trying to finish struct, but kicked out due to previous parse errors.");
5171 if (processing_template_decl)
5173 tree scope = current_scope ();
5174 if (scope && TREE_CODE (scope) == FUNCTION_DECL)
5175 add_tree (build_min (TAG_DEFN, t));
5181 /* Return the dynamic type of INSTANCE, if known.
5182 Used to determine whether the virtual function table is needed
5185 *NONNULL is set iff INSTANCE can be known to be nonnull, regardless
5186 of our knowledge of its type. *NONNULL should be initialized
5187 before this function is called. */
5190 fixed_type_or_null (instance, nonnull)
5194 switch (TREE_CODE (instance))
5197 /* Check that we are not going through a cast of some sort. */
5198 if (TREE_TYPE (instance)
5199 == TREE_TYPE (TREE_TYPE (TREE_OPERAND (instance, 0))))
5200 instance = TREE_OPERAND (instance, 0);
5201 /* fall through... */
5203 /* This is a call to a constructor, hence it's never zero. */
5204 if (TREE_HAS_CONSTRUCTOR (instance))
5208 return TREE_TYPE (instance);
5213 /* This is a call to a constructor, hence it's never zero. */
5214 if (TREE_HAS_CONSTRUCTOR (instance))
5218 return TREE_TYPE (instance);
5220 return fixed_type_or_null (TREE_OPERAND (instance, 0), nonnull);
5227 if (TREE_CODE (TREE_OPERAND (instance, 1)) == INTEGER_CST)
5228 /* Propagate nonnull. */
5229 fixed_type_or_null (TREE_OPERAND (instance, 0), nonnull);
5230 if (TREE_CODE (TREE_OPERAND (instance, 0)) == ADDR_EXPR)
5231 return fixed_type_or_null (TREE_OPERAND (instance, 0), nonnull);
5236 return fixed_type_or_null (TREE_OPERAND (instance, 0), nonnull);
5241 return fixed_type_or_null (TREE_OPERAND (instance, 0), nonnull);
5244 return fixed_type_or_null (TREE_OPERAND (instance, 1), nonnull);
5248 if (TREE_CODE (TREE_TYPE (instance)) == ARRAY_TYPE
5249 && IS_AGGR_TYPE (TREE_TYPE (TREE_TYPE (instance))))
5253 return TREE_TYPE (TREE_TYPE (instance));
5255 /* fall through... */
5258 if (IS_AGGR_TYPE (TREE_TYPE (instance)))
5262 return TREE_TYPE (instance);
5266 if (instance == current_class_ptr
5267 && flag_this_is_variable <= 0)
5269 /* Normally, 'this' must be non-null. */
5270 if (flag_this_is_variable == 0)
5273 /* <0 means we're in a constructor and we know our type. */
5274 if (flag_this_is_variable < 0)
5275 return TREE_TYPE (TREE_TYPE (instance));
5277 else if (TREE_CODE (TREE_TYPE (instance)) == REFERENCE_TYPE)
5278 /* Reference variables should be references to objects. */
5288 /* Return non-zero if the dynamic type of INSTANCE is known, and equivalent
5289 to the static type. We also handle the case where INSTANCE is really
5292 Used to determine whether the virtual function table is needed
5295 *NONNULL is set iff INSTANCE can be known to be nonnull, regardless
5296 of our knowledge of its type. *NONNULL should be initialized
5297 before this function is called. */
5300 resolves_to_fixed_type_p (instance, nonnull)
5304 tree t = TREE_TYPE (instance);
5305 tree fixed = fixed_type_or_null (instance, nonnull);
5306 if (fixed == NULL_TREE)
5308 if (POINTER_TYPE_P (t))
5310 return same_type_p (TYPE_MAIN_VARIANT (t), TYPE_MAIN_VARIANT (fixed));
5315 init_class_processing ()
5317 current_class_depth = 0;
5318 current_class_stack_size = 10;
5320 = (class_stack_node_t) xmalloc (current_class_stack_size
5321 * sizeof (struct class_stack_node));
5323 access_default_node = build_int_2 (0, 0);
5324 access_public_node = build_int_2 (1, 0);
5325 access_protected_node = build_int_2 (2, 0);
5326 access_private_node = build_int_2 (3, 0);
5327 access_default_virtual_node = build_int_2 (4, 0);
5328 access_public_virtual_node = build_int_2 (5, 0);
5329 access_protected_virtual_node = build_int_2 (6, 0);
5330 access_private_virtual_node = build_int_2 (7, 0);
5333 /* Set current scope to NAME. CODE tells us if this is a
5334 STRUCT, UNION, or ENUM environment.
5336 NAME may end up being NULL_TREE if this is an anonymous or
5337 late-bound struct (as in "struct { ... } foo;") */
5339 /* Set global variables CURRENT_CLASS_NAME and CURRENT_CLASS_TYPE to
5340 appropriate values, found by looking up the type definition of
5343 If MODIFY is 1, we set IDENTIFIER_CLASS_VALUE's of names
5344 which can be seen locally to the class. They are shadowed by
5345 any subsequent local declaration (including parameter names).
5347 If MODIFY is 2, we set IDENTIFIER_CLASS_VALUE's of names
5348 which have static meaning (i.e., static members, static
5349 member functions, enum declarations, etc).
5351 If MODIFY is 3, we set IDENTIFIER_CLASS_VALUE of names
5352 which can be seen locally to the class (as in 1), but
5353 know that we are doing this for declaration purposes
5354 (i.e. friend foo::bar (int)).
5356 So that we may avoid calls to lookup_name, we cache the _TYPE
5357 nodes of local TYPE_DECLs in the TREE_TYPE field of the name.
5359 For multiple inheritance, we perform a two-pass depth-first search
5360 of the type lattice. The first pass performs a pre-order search,
5361 marking types after the type has had its fields installed in
5362 the appropriate IDENTIFIER_CLASS_VALUE slot. The second pass merely
5363 unmarks the marked types. If a field or member function name
5364 appears in an ambiguous way, the IDENTIFIER_CLASS_VALUE of
5365 that name becomes `error_mark_node'. */
5368 pushclass (type, modify)
5372 type = TYPE_MAIN_VARIANT (type);
5374 /* Make sure there is enough room for the new entry on the stack. */
5375 if (current_class_depth + 1 >= current_class_stack_size)
5377 current_class_stack_size *= 2;
5379 = (class_stack_node_t) xrealloc (current_class_stack,
5380 current_class_stack_size
5381 * sizeof (struct class_stack_node));
5384 /* Insert a new entry on the class stack. */
5385 current_class_stack[current_class_depth].name = current_class_name;
5386 current_class_stack[current_class_depth].type = current_class_type;
5387 current_class_stack[current_class_depth].access = current_access_specifier;
5388 current_class_stack[current_class_depth].names_used = 0;
5389 current_class_depth++;
5391 /* Now set up the new type. */
5392 current_class_name = TYPE_NAME (type);
5393 if (TREE_CODE (current_class_name) == TYPE_DECL)
5394 current_class_name = DECL_NAME (current_class_name);
5395 current_class_type = type;
5397 /* By default, things in classes are private, while things in
5398 structures or unions are public. */
5399 current_access_specifier = (CLASSTYPE_DECLARED_CLASS (type)
5400 ? access_private_node
5401 : access_public_node);
5403 if (previous_class_type != NULL_TREE
5404 && (type != previous_class_type
5405 || TYPE_SIZE (previous_class_type) == NULL_TREE)
5406 && current_class_depth == 1)
5408 /* Forcibly remove any old class remnants. */
5409 invalidate_class_lookup_cache ();
5412 /* If we're about to enter a nested class, clear
5413 IDENTIFIER_CLASS_VALUE for the enclosing classes. */
5414 if (modify && current_class_depth > 1)
5415 clear_identifier_class_values ();
5420 if (CLASSTYPE_TEMPLATE_INFO (type))
5421 overload_template_name (type);
5426 if (type != previous_class_type || current_class_depth > 1)
5427 push_class_decls (type);
5432 /* We are re-entering the same class we just left, so we
5433 don't have to search the whole inheritance matrix to find
5434 all the decls to bind again. Instead, we install the
5435 cached class_shadowed list, and walk through it binding
5436 names and setting up IDENTIFIER_TYPE_VALUEs. */
5437 set_class_shadows (previous_class_values);
5438 for (item = previous_class_values; item; item = TREE_CHAIN (item))
5440 tree id = TREE_PURPOSE (item);
5441 tree decl = TREE_TYPE (item);
5443 push_class_binding (id, decl);
5444 if (TREE_CODE (decl) == TYPE_DECL)
5445 set_identifier_type_value (id, TREE_TYPE (decl));
5447 unuse_fields (type);
5450 storetags (CLASSTYPE_TAGS (type));
5454 /* When we exit a toplevel class scope, we save the
5455 IDENTIFIER_CLASS_VALUEs so that we can restore them quickly if we
5456 reenter the class. Here, we've entered some other class, so we
5457 must invalidate our cache. */
5460 invalidate_class_lookup_cache ()
5464 /* This code can be seen as a cache miss. When we've cached a
5465 class' scope's bindings and we can't use them, we need to reset
5466 them. This is it! */
5467 for (t = previous_class_values; t; t = TREE_CHAIN (t))
5468 IDENTIFIER_CLASS_VALUE (TREE_PURPOSE (t)) = NULL_TREE;
5470 previous_class_type = NULL_TREE;
5473 /* Get out of the current class scope. If we were in a class scope
5474 previously, that is the one popped to. */
5480 /* Since poplevel_class does the popping of class decls nowadays,
5481 this really only frees the obstack used for these decls. */
5484 current_class_depth--;
5485 current_class_name = current_class_stack[current_class_depth].name;
5486 current_class_type = current_class_stack[current_class_depth].type;
5487 current_access_specifier = current_class_stack[current_class_depth].access;
5488 if (current_class_stack[current_class_depth].names_used)
5489 splay_tree_delete (current_class_stack[current_class_depth].names_used);
5492 /* Returns 1 if current_class_type is either T or a nested type of T.
5493 We start looking from 1 because entry 0 is from global scope, and has
5497 currently_open_class (t)
5501 if (t == current_class_type)
5503 for (i = 1; i < current_class_depth; ++i)
5504 if (current_class_stack [i].type == t)
5509 /* If either current_class_type or one of its enclosing classes are derived
5510 from T, return the appropriate type. Used to determine how we found
5511 something via unqualified lookup. */
5514 currently_open_derived_class (t)
5519 if (DERIVED_FROM_P (t, current_class_type))
5520 return current_class_type;
5522 for (i = current_class_depth - 1; i > 0; --i)
5523 if (DERIVED_FROM_P (t, current_class_stack[i].type))
5524 return current_class_stack[i].type;
5529 /* When entering a class scope, all enclosing class scopes' names with
5530 static meaning (static variables, static functions, types and enumerators)
5531 have to be visible. This recursive function calls pushclass for all
5532 enclosing class contexts until global or a local scope is reached.
5533 TYPE is the enclosed class and MODIFY is equivalent with the pushclass
5534 formal of the same name. */
5537 push_nested_class (type, modify)
5543 /* A namespace might be passed in error cases, like A::B:C. */
5544 if (type == NULL_TREE
5545 || type == error_mark_node
5546 || TREE_CODE (type) == NAMESPACE_DECL
5547 || ! IS_AGGR_TYPE (type)
5548 || TREE_CODE (type) == TEMPLATE_TYPE_PARM
5549 || TREE_CODE (type) == TEMPLATE_TEMPLATE_PARM)
5552 context = DECL_CONTEXT (TYPE_MAIN_DECL (type));
5554 if (context && CLASS_TYPE_P (context))
5555 push_nested_class (context, 2);
5556 pushclass (type, modify);
5559 /* Undoes a push_nested_class call. MODIFY is passed on to popclass. */
5564 tree context = DECL_CONTEXT (TYPE_MAIN_DECL (current_class_type));
5567 if (context && CLASS_TYPE_P (context))
5568 pop_nested_class ();
5571 /* Set global variables CURRENT_LANG_NAME to appropriate value
5572 so that behavior of name-mangling machinery is correct. */
5575 push_lang_context (name)
5578 *current_lang_stack++ = current_lang_name;
5579 if (current_lang_stack - &VARRAY_TREE (current_lang_base, 0)
5580 >= (ptrdiff_t) VARRAY_SIZE (current_lang_base))
5582 size_t old_size = VARRAY_SIZE (current_lang_base);
5584 VARRAY_GROW (current_lang_base, old_size + 10);
5585 current_lang_stack = &VARRAY_TREE (current_lang_base, old_size);
5588 if (name == lang_name_cplusplus)
5590 strict_prototype = strict_prototypes_lang_cplusplus;
5591 current_lang_name = name;
5593 else if (name == lang_name_java)
5595 strict_prototype = strict_prototypes_lang_cplusplus;
5596 current_lang_name = name;
5597 /* DECL_IGNORED_P is initially set for these types, to avoid clutter.
5598 (See record_builtin_java_type in decl.c.) However, that causes
5599 incorrect debug entries if these types are actually used.
5600 So we re-enable debug output after extern "Java". */
5601 DECL_IGNORED_P (java_byte_type_node) = 0;
5602 DECL_IGNORED_P (java_short_type_node) = 0;
5603 DECL_IGNORED_P (java_int_type_node) = 0;
5604 DECL_IGNORED_P (java_long_type_node) = 0;
5605 DECL_IGNORED_P (java_float_type_node) = 0;
5606 DECL_IGNORED_P (java_double_type_node) = 0;
5607 DECL_IGNORED_P (java_char_type_node) = 0;
5608 DECL_IGNORED_P (java_boolean_type_node) = 0;
5610 else if (name == lang_name_c)
5612 strict_prototype = strict_prototypes_lang_c;
5613 current_lang_name = name;
5616 error ("language string `\"%s\"' not recognized", IDENTIFIER_POINTER (name));
5619 /* Get out of the current language scope. */
5624 /* Clear the current entry so that garbage collector won't hold on
5626 *current_lang_stack = NULL_TREE;
5627 current_lang_name = *--current_lang_stack;
5628 if (current_lang_name == lang_name_cplusplus
5629 || current_lang_name == lang_name_java)
5630 strict_prototype = strict_prototypes_lang_cplusplus;
5631 else if (current_lang_name == lang_name_c)
5632 strict_prototype = strict_prototypes_lang_c;
5635 /* Type instantiation routines. */
5637 /* Given an OVERLOAD and a TARGET_TYPE, return the function that
5638 matches the TARGET_TYPE. If there is no satisfactory match, return
5639 error_mark_node, and issue an error message if COMPLAIN is
5640 non-zero. If TEMPLATE_ONLY, the name of the overloaded function
5641 was a template-id, and EXPLICIT_TARGS are the explicitly provided
5642 template arguments. */
5645 resolve_address_of_overloaded_function (target_type,
5654 tree explicit_targs;
5656 /* Here's what the standard says:
5660 If the name is a function template, template argument deduction
5661 is done, and if the argument deduction succeeds, the deduced
5662 arguments are used to generate a single template function, which
5663 is added to the set of overloaded functions considered.
5665 Non-member functions and static member functions match targets of
5666 type "pointer-to-function" or "reference-to-function." Nonstatic
5667 member functions match targets of type "pointer-to-member
5668 function;" the function type of the pointer to member is used to
5669 select the member function from the set of overloaded member
5670 functions. If a nonstatic member function is selected, the
5671 reference to the overloaded function name is required to have the
5672 form of a pointer to member as described in 5.3.1.
5674 If more than one function is selected, any template functions in
5675 the set are eliminated if the set also contains a non-template
5676 function, and any given template function is eliminated if the
5677 set contains a second template function that is more specialized
5678 than the first according to the partial ordering rules 14.5.5.2.
5679 After such eliminations, if any, there shall remain exactly one
5680 selected function. */
5683 int is_reference = 0;
5684 /* We store the matches in a TREE_LIST rooted here. The functions
5685 are the TREE_PURPOSE, not the TREE_VALUE, in this list, for easy
5686 interoperability with most_specialized_instantiation. */
5687 tree matches = NULL_TREE;
5690 /* By the time we get here, we should be seeing only real
5691 pointer-to-member types, not the internal POINTER_TYPE to
5692 METHOD_TYPE representation. */
5693 my_friendly_assert (!(TREE_CODE (target_type) == POINTER_TYPE
5694 && (TREE_CODE (TREE_TYPE (target_type))
5695 == METHOD_TYPE)), 0);
5697 /* Check that the TARGET_TYPE is reasonable. */
5698 if (TYPE_PTRFN_P (target_type))
5701 else if (TYPE_PTRMEMFUNC_P (target_type))
5702 /* This is OK, too. */
5704 else if (TREE_CODE (target_type) == FUNCTION_TYPE)
5706 /* This is OK, too. This comes from a conversion to reference
5708 target_type = build_reference_type (target_type);
5714 cp_error("cannot resolve overloaded function `%D' based on conversion to type `%T'",
5715 DECL_NAME (OVL_FUNCTION (overload)), target_type);
5716 return error_mark_node;
5719 /* If we can find a non-template function that matches, we can just
5720 use it. There's no point in generating template instantiations
5721 if we're just going to throw them out anyhow. But, of course, we
5722 can only do this when we don't *need* a template function. */
5727 for (fns = overload; fns; fns = OVL_CHAIN (fns))
5729 tree fn = OVL_FUNCTION (fns);
5732 if (TREE_CODE (fn) == TEMPLATE_DECL)
5733 /* We're not looking for templates just yet. */
5736 if ((TREE_CODE (TREE_TYPE (fn)) == METHOD_TYPE)
5738 /* We're looking for a non-static member, and this isn't
5739 one, or vice versa. */
5742 /* See if there's a match. */
5743 fntype = TREE_TYPE (fn);
5745 fntype = build_ptrmemfunc_type (build_pointer_type (fntype));
5746 else if (!is_reference)
5747 fntype = build_pointer_type (fntype);
5749 if (can_convert_arg (target_type, fntype, fn))
5750 matches = tree_cons (fn, NULL_TREE, matches);
5754 /* Now, if we've already got a match (or matches), there's no need
5755 to proceed to the template functions. But, if we don't have a
5756 match we need to look at them, too. */
5759 tree target_fn_type;
5760 tree target_arg_types;
5765 = TREE_TYPE (TYPE_PTRMEMFUNC_FN_TYPE (target_type));
5767 target_fn_type = TREE_TYPE (target_type);
5768 target_arg_types = TYPE_ARG_TYPES (target_fn_type);
5770 for (fns = overload; fns; fns = OVL_CHAIN (fns))
5772 tree fn = OVL_FUNCTION (fns);
5774 tree instantiation_type;
5777 if (TREE_CODE (fn) != TEMPLATE_DECL)
5778 /* We're only looking for templates. */
5781 if ((TREE_CODE (TREE_TYPE (fn)) == METHOD_TYPE)
5783 /* We're not looking for a non-static member, and this is
5784 one, or vice versa. */
5787 /* Try to do argument deduction. */
5788 targs = make_tree_vec (DECL_NTPARMS (fn));
5789 if (fn_type_unification (fn, explicit_targs, targs,
5790 target_arg_types, NULL_TREE,
5792 /* Argument deduction failed. */
5795 /* Instantiate the template. */
5796 instantiation = instantiate_template (fn, targs);
5797 if (instantiation == error_mark_node)
5798 /* Instantiation failed. */
5801 /* See if there's a match. */
5802 instantiation_type = TREE_TYPE (instantiation);
5804 instantiation_type =
5805 build_ptrmemfunc_type (build_pointer_type (instantiation_type));
5806 else if (!is_reference)
5807 instantiation_type = build_pointer_type (instantiation_type);
5808 if (can_convert_arg (target_type, instantiation_type, instantiation))
5809 matches = tree_cons (instantiation, fn, matches);
5812 /* Now, remove all but the most specialized of the matches. */
5815 tree match = most_specialized_instantiation (matches,
5818 if (match != error_mark_node)
5819 matches = tree_cons (match, NULL_TREE, NULL_TREE);
5823 /* Now we should have exactly one function in MATCHES. */
5824 if (matches == NULL_TREE)
5826 /* There were *no* matches. */
5829 cp_error ("no matches converting function `%D' to type `%#T'",
5830 DECL_NAME (OVL_FUNCTION (overload)),
5833 /* print_candidates expects a chain with the functions in
5834 TREE_VALUE slots, so we cons one up here (we're losing anyway,
5835 so why be clever?). */
5836 for (; overload; overload = OVL_NEXT (overload))
5837 matches = tree_cons (NULL_TREE, OVL_CURRENT (overload),
5840 print_candidates (matches);
5842 return error_mark_node;
5844 else if (TREE_CHAIN (matches))
5846 /* There were too many matches. */
5852 cp_error ("converting overloaded function `%D' to type `%#T' is ambiguous",
5853 DECL_NAME (OVL_FUNCTION (overload)),
5856 /* Since print_candidates expects the functions in the
5857 TREE_VALUE slot, we flip them here. */
5858 for (match = matches; match; match = TREE_CHAIN (match))
5859 TREE_VALUE (match) = TREE_PURPOSE (match);
5861 print_candidates (matches);
5864 return error_mark_node;
5867 /* Good, exactly one match. Now, convert it to the correct type. */
5868 fn = TREE_PURPOSE (matches);
5872 if (TYPE_PTRFN_P (target_type) || TYPE_PTRMEMFUNC_P (target_type))
5873 return build_unary_op (ADDR_EXPR, fn, 0);
5876 /* The target must be a REFERENCE_TYPE. Above, build_unary_op
5877 will mark the function as addressed, but here we must do it
5879 mark_addressable (fn);
5885 /* This function will instantiate the type of the expression given in
5886 RHS to match the type of LHSTYPE. If errors exist, then return
5887 error_mark_node. We only complain is COMPLAIN is set. If we are
5888 not complaining, never modify rhs, as overload resolution wants to
5889 try many possible instantiations, in hopes that at least one will
5892 FLAGS is a bitmask, as we see at the top of the function.
5894 For non-recursive calls, LHSTYPE should be a function, pointer to
5895 function, or a pointer to member function. */
5898 instantiate_type (lhstype, rhs, flags)
5902 int complain = (flags & 1);
5903 int strict = (flags & 2) ? COMPARE_NO_ATTRIBUTES : COMPARE_STRICT;
5905 if (TREE_CODE (lhstype) == UNKNOWN_TYPE)
5908 error ("not enough type information");
5909 return error_mark_node;
5912 if (TREE_TYPE (rhs) != NULL_TREE && ! (type_unknown_p (rhs)))
5914 if (comptypes (lhstype, TREE_TYPE (rhs), strict))
5917 cp_error ("argument of type `%T' does not match `%T'",
5918 TREE_TYPE (rhs), lhstype);
5919 return error_mark_node;
5922 /* We don't overwrite rhs if it is an overloaded function.
5923 Copying it would destroy the tree link. */
5924 if (TREE_CODE (rhs) != OVERLOAD)
5925 rhs = copy_node (rhs);
5927 /* This should really only be used when attempting to distinguish
5928 what sort of a pointer to function we have. For now, any
5929 arithmetic operation which is not supported on pointers
5930 is rejected as an error. */
5932 switch (TREE_CODE (rhs))
5939 my_friendly_abort (177);
5940 return error_mark_node;
5947 new_rhs = instantiate_type (build_pointer_type (lhstype),
5948 TREE_OPERAND (rhs, 0), flags);
5949 if (new_rhs == error_mark_node)
5950 return error_mark_node;
5952 TREE_TYPE (rhs) = lhstype;
5953 TREE_OPERAND (rhs, 0) = new_rhs;
5958 rhs = copy_node (TREE_OPERAND (rhs, 0));
5959 TREE_TYPE (rhs) = unknown_type_node;
5960 return instantiate_type (lhstype, rhs, flags);
5964 tree r = instantiate_type (lhstype, TREE_OPERAND (rhs, 1), flags);
5966 if (r != error_mark_node && TYPE_PTRMEMFUNC_P (lhstype)
5967 && complain && !flag_ms_extensions)
5969 /* Note: we check this after the recursive call to avoid
5970 complaining about cases where overload resolution fails. */
5972 tree t = TREE_TYPE (TREE_OPERAND (rhs, 0));
5973 tree fn = PTRMEM_CST_MEMBER (r);
5975 my_friendly_assert (TREE_CODE (r) == PTRMEM_CST, 990811);
5978 ("object-dependent reference to `%E' can only be used in a call",
5981 (" to form a pointer to member function, say `&%T::%E'",
5989 rhs = TREE_OPERAND (rhs, 1);
5990 if (BASELINK_P (rhs))
5991 return instantiate_type (lhstype, TREE_VALUE (rhs), flags);
5993 /* This can happen if we are forming a pointer-to-member for a
5995 my_friendly_assert (TREE_CODE (rhs) == TEMPLATE_ID_EXPR, 0);
5999 case TEMPLATE_ID_EXPR:
6001 resolve_address_of_overloaded_function (lhstype,
6002 TREE_OPERAND (rhs, 0),
6004 /*template_only=*/1,
6005 TREE_OPERAND (rhs, 1));
6009 resolve_address_of_overloaded_function (lhstype,
6012 /*template_only=*/0,
6013 /*explicit_targs=*/NULL_TREE);
6016 /* Now we should have a baselink. */
6017 my_friendly_assert (BASELINK_P (rhs), 990412);
6019 return instantiate_type (lhstype, TREE_VALUE (rhs), flags);
6022 /* This is too hard for now. */
6023 my_friendly_abort (183);
6024 return error_mark_node;
6029 TREE_OPERAND (rhs, 0)
6030 = instantiate_type (lhstype, TREE_OPERAND (rhs, 0), flags);
6031 if (TREE_OPERAND (rhs, 0) == error_mark_node)
6032 return error_mark_node;
6033 TREE_OPERAND (rhs, 1)
6034 = instantiate_type (lhstype, TREE_OPERAND (rhs, 1), flags);
6035 if (TREE_OPERAND (rhs, 1) == error_mark_node)
6036 return error_mark_node;
6038 TREE_TYPE (rhs) = lhstype;
6042 case TRUNC_DIV_EXPR:
6043 case FLOOR_DIV_EXPR:
6045 case ROUND_DIV_EXPR:
6047 case TRUNC_MOD_EXPR:
6048 case FLOOR_MOD_EXPR:
6050 case ROUND_MOD_EXPR:
6051 case FIX_ROUND_EXPR:
6052 case FIX_FLOOR_EXPR:
6054 case FIX_TRUNC_EXPR:
6070 case PREINCREMENT_EXPR:
6071 case PREDECREMENT_EXPR:
6072 case POSTINCREMENT_EXPR:
6073 case POSTDECREMENT_EXPR:
6075 error ("invalid operation on uninstantiated type");
6076 return error_mark_node;
6078 case TRUTH_AND_EXPR:
6080 case TRUTH_XOR_EXPR:
6087 case TRUTH_ANDIF_EXPR:
6088 case TRUTH_ORIF_EXPR:
6089 case TRUTH_NOT_EXPR:
6091 error ("not enough type information");
6092 return error_mark_node;
6095 if (type_unknown_p (TREE_OPERAND (rhs, 0)))
6098 error ("not enough type information");
6099 return error_mark_node;
6101 TREE_OPERAND (rhs, 1)
6102 = instantiate_type (lhstype, TREE_OPERAND (rhs, 1), flags);
6103 if (TREE_OPERAND (rhs, 1) == error_mark_node)
6104 return error_mark_node;
6105 TREE_OPERAND (rhs, 2)
6106 = instantiate_type (lhstype, TREE_OPERAND (rhs, 2), flags);
6107 if (TREE_OPERAND (rhs, 2) == error_mark_node)
6108 return error_mark_node;
6110 TREE_TYPE (rhs) = lhstype;
6114 TREE_OPERAND (rhs, 1)
6115 = instantiate_type (lhstype, TREE_OPERAND (rhs, 1), flags);
6116 if (TREE_OPERAND (rhs, 1) == error_mark_node)
6117 return error_mark_node;
6119 TREE_TYPE (rhs) = lhstype;
6123 return instantiate_type (lhstype, TREE_OPERAND (rhs, 0), flags);
6125 case ENTRY_VALUE_EXPR:
6126 my_friendly_abort (184);
6127 return error_mark_node;
6130 return error_mark_node;
6133 my_friendly_abort (185);
6134 return error_mark_node;
6138 /* Return the name of the virtual function pointer field
6139 (as an IDENTIFIER_NODE) for the given TYPE. Note that
6140 this may have to look back through base types to find the
6141 ultimate field name. (For single inheritance, these could
6142 all be the same name. Who knows for multiple inheritance). */
6145 get_vfield_name (type)
6148 tree binfo = TYPE_BINFO (type);
6151 while (BINFO_BASETYPES (binfo)
6152 && TYPE_CONTAINS_VPTR_P (BINFO_TYPE (BINFO_BASETYPE (binfo, 0)))
6153 && ! TREE_VIA_VIRTUAL (BINFO_BASETYPE (binfo, 0)))
6154 binfo = BINFO_BASETYPE (binfo, 0);
6156 type = BINFO_TYPE (binfo);
6157 buf = (char *) alloca (sizeof (VFIELD_NAME_FORMAT)
6158 + TYPE_NAME_LENGTH (type) + 2);
6159 sprintf (buf, VFIELD_NAME_FORMAT, TYPE_NAME_STRING (type));
6160 return get_identifier (buf);
6164 print_class_statistics ()
6166 #ifdef GATHER_STATISTICS
6167 fprintf (stderr, "convert_harshness = %d\n", n_convert_harshness);
6168 fprintf (stderr, "compute_conversion_costs = %d\n", n_compute_conversion_costs);
6169 fprintf (stderr, "build_method_call = %d (inner = %d)\n",
6170 n_build_method_call, n_inner_fields_searched);
6173 fprintf (stderr, "vtables = %d; vtable searches = %d\n",
6174 n_vtables, n_vtable_searches);
6175 fprintf (stderr, "vtable entries = %d; vtable elems = %d\n",
6176 n_vtable_entries, n_vtable_elems);
6181 /* Build a dummy reference to ourselves so Derived::Base (and A::A) works,
6182 according to [class]:
6183 The class-name is also inserted
6184 into the scope of the class itself. For purposes of access checking,
6185 the inserted class name is treated as if it were a public member name. */
6188 build_self_reference ()
6190 tree name = constructor_name (current_class_type);
6191 tree value = build_lang_decl (TYPE_DECL, name, current_class_type);
6194 DECL_NONLOCAL (value) = 1;
6195 DECL_CONTEXT (value) = current_class_type;
6196 DECL_ARTIFICIAL (value) = 1;
6198 if (processing_template_decl)
6199 value = push_template_decl (value);
6201 saved_cas = current_access_specifier;
6202 current_access_specifier = access_public_node;
6203 finish_member_declaration (value);
6204 current_access_specifier = saved_cas;
6207 /* Returns 1 if TYPE contains only padding bytes. */
6210 is_empty_class (type)
6215 if (type == error_mark_node)
6218 if (! IS_AGGR_TYPE (type))
6222 return CLASSTYPE_SIZE (type) == integer_zero_node;
6224 if (TYPE_BINFO_BASETYPES (type))
6226 t = TYPE_FIELDS (type);
6227 while (t && TREE_CODE (t) != FIELD_DECL)
6229 return (t == NULL_TREE);
6232 /* Find the enclosing class of the given NODE. NODE can be a *_DECL or
6233 a *_TYPE node. NODE can also be a local class. */
6236 get_enclosing_class (type)
6241 while (node && TREE_CODE (node) != NAMESPACE_DECL)
6243 switch (TREE_CODE_CLASS (TREE_CODE (node)))
6246 node = DECL_CONTEXT (node);
6252 node = TYPE_CONTEXT (node);
6256 my_friendly_abort (0);
6262 /* Return 1 if TYPE or one of its enclosing classes is derived from BASE. */
6265 is_base_of_enclosing_class (base, type)
6270 if (get_binfo (base, type, 0))
6273 type = get_enclosing_class (type);
6278 /* Note that NAME was looked up while the current class was being
6279 defined and that the result of that lookup was DECL. */
6282 maybe_note_name_used_in_class (name, decl)
6286 splay_tree names_used;
6288 /* If we're not defining a class, there's nothing to do. */
6289 if (!current_class_type || !TYPE_BEING_DEFINED (current_class_type))
6292 /* If there's already a binding for this NAME, then we don't have
6293 anything to worry about. */
6294 if (IDENTIFIER_CLASS_VALUE (name))
6297 if (!current_class_stack[current_class_depth - 1].names_used)
6298 current_class_stack[current_class_depth - 1].names_used
6299 = splay_tree_new (splay_tree_compare_pointers, 0, 0);
6300 names_used = current_class_stack[current_class_depth - 1].names_used;
6302 splay_tree_insert (names_used,
6303 (splay_tree_key) name,
6304 (splay_tree_value) decl);
6307 /* Note that NAME was declared (as DECL) in the current class. Check
6308 to see that the declaration is legal. */
6311 note_name_declared_in_class (name, decl)
6315 splay_tree names_used;
6318 /* Look to see if we ever used this name. */
6320 = current_class_stack[current_class_depth - 1].names_used;
6324 n = splay_tree_lookup (names_used, (splay_tree_key) name);
6327 /* [basic.scope.class]
6329 A name N used in a class S shall refer to the same declaration
6330 in its context and when re-evaluated in the completed scope of
6332 cp_error ("declaration of `%#D'", decl);
6333 cp_error_at ("changes meaning of `%s' from `%+#D'",
6334 IDENTIFIER_POINTER (DECL_NAME (decl)),
6339 /* Dump the offsets of all the bases rooted at BINFO to stderr.
6340 INDENT should be zero when called from the top level; it is
6341 incremented recursively. */
6344 dump_class_hierarchy (binfo, indent)
6350 fprintf (stderr, "%*s0x%lx (%s) ", indent, "",
6351 (unsigned long) binfo,
6352 type_as_string (binfo, TS_PLAIN));
6353 fprintf (stderr, HOST_WIDE_INT_PRINT_DEC,
6354 TREE_INT_CST_LOW (BINFO_OFFSET (binfo)));
6355 fprintf (stderr, " %s\n",
6356 BINFO_PRIMARY_MARKED_P (binfo) ? "primary" : "");
6358 for (i = 0; i < BINFO_N_BASETYPES (binfo); ++i)
6359 dump_class_hierarchy (BINFO_BASETYPE (binfo, i), indent + 2);