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Commit | Line | Data |
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8d08fdba | 1 | /* Functions related to building classes and their related objects. |
06ceef4e | 2 | Copyright (C) 1987, 1992, 1993, 1994, 1995, 1996, 1997, 1998, |
0a57b6af | 3 | 1999, 2000, 2001, 2002, 2003, 2004, 2005 Free Software Foundation, Inc. |
8d08fdba MS |
4 | Contributed by Michael Tiemann (tiemann@cygnus.com) |
5 | ||
f5adbb8d | 6 | This file is part of GCC. |
8d08fdba | 7 | |
f5adbb8d | 8 | GCC is free software; you can redistribute it and/or modify |
8d08fdba MS |
9 | it under the terms of the GNU General Public License as published by |
10 | the Free Software Foundation; either version 2, or (at your option) | |
11 | any later version. | |
12 | ||
f5adbb8d | 13 | GCC is distributed in the hope that it will be useful, |
8d08fdba MS |
14 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | GNU General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU General Public License | |
f5adbb8d | 19 | along with GCC; see the file COPYING. If not, write to |
1788952f KC |
20 | the Free Software Foundation, 51 Franklin Street, Fifth Floor, |
21 | Boston, MA 02110-1301, USA. */ | |
8d08fdba MS |
22 | |
23 | ||
e92cc029 | 24 | /* High-level class interface. */ |
8d08fdba MS |
25 | |
26 | #include "config.h" | |
8d052bc7 | 27 | #include "system.h" |
4977bab6 ZW |
28 | #include "coretypes.h" |
29 | #include "tm.h" | |
e7a587ef | 30 | #include "tree.h" |
8d08fdba MS |
31 | #include "cp-tree.h" |
32 | #include "flags.h" | |
28cbf42c | 33 | #include "rtl.h" |
e8abc66f | 34 | #include "output.h" |
54f92bfb | 35 | #include "toplev.h" |
1af6141b | 36 | #include "target.h" |
7b6d72fc | 37 | #include "convert.h" |
8634c649 | 38 | #include "cgraph.h" |
ef330312 | 39 | #include "tree-dump.h" |
8d08fdba | 40 | |
61a127b3 MM |
41 | /* The number of nested classes being processed. If we are not in the |
42 | scope of any class, this is zero. */ | |
43 | ||
8d08fdba MS |
44 | int current_class_depth; |
45 | ||
61a127b3 MM |
46 | /* In order to deal with nested classes, we keep a stack of classes. |
47 | The topmost entry is the innermost class, and is the entry at index | |
48 | CURRENT_CLASS_DEPTH */ | |
49 | ||
50 | typedef struct class_stack_node { | |
51 | /* The name of the class. */ | |
52 | tree name; | |
53 | ||
54 | /* The _TYPE node for the class. */ | |
55 | tree type; | |
56 | ||
57 | /* The access specifier pending for new declarations in the scope of | |
58 | this class. */ | |
59 | tree access; | |
8f032717 MM |
60 | |
61 | /* If were defining TYPE, the names used in this class. */ | |
62 | splay_tree names_used; | |
61a127b3 MM |
63 | }* class_stack_node_t; |
64 | ||
911a71a7 | 65 | typedef struct vtbl_init_data_s |
c35cce41 | 66 | { |
911a71a7 MM |
67 | /* The base for which we're building initializers. */ |
68 | tree binfo; | |
73ea87d7 | 69 | /* The type of the most-derived type. */ |
c35cce41 | 70 | tree derived; |
73ea87d7 NS |
71 | /* The binfo for the dynamic type. This will be TYPE_BINFO (derived), |
72 | unless ctor_vtbl_p is true. */ | |
73 | tree rtti_binfo; | |
9bab6c90 MM |
74 | /* The negative-index vtable initializers built up so far. These |
75 | are in order from least negative index to most negative index. */ | |
76 | tree inits; | |
d0cd8b44 | 77 | /* The last (i.e., most negative) entry in INITS. */ |
9bab6c90 | 78 | tree* last_init; |
c35cce41 | 79 | /* The binfo for the virtual base for which we're building |
911a71a7 | 80 | vcall offset initializers. */ |
c35cce41 | 81 | tree vbase; |
9bab6c90 MM |
82 | /* The functions in vbase for which we have already provided vcall |
83 | offsets. */ | |
1e625046 | 84 | VEC(tree,gc) *fns; |
c35cce41 MM |
85 | /* The vtable index of the next vcall or vbase offset. */ |
86 | tree index; | |
87 | /* Nonzero if we are building the initializer for the primary | |
88 | vtable. */ | |
911a71a7 MM |
89 | int primary_vtbl_p; |
90 | /* Nonzero if we are building the initializer for a construction | |
91 | vtable. */ | |
92 | int ctor_vtbl_p; | |
548502d3 MM |
93 | /* True when adding vcall offset entries to the vtable. False when |
94 | merely computing the indices. */ | |
95 | bool generate_vcall_entries; | |
911a71a7 | 96 | } vtbl_init_data; |
c35cce41 | 97 | |
c20118a8 | 98 | /* The type of a function passed to walk_subobject_offsets. */ |
94edc4ab | 99 | typedef int (*subobject_offset_fn) (tree, tree, splay_tree); |
c20118a8 | 100 | |
4639c5c6 | 101 | /* The stack itself. This is a dynamically resized array. The |
61a127b3 MM |
102 | number of elements allocated is CURRENT_CLASS_STACK_SIZE. */ |
103 | static int current_class_stack_size; | |
104 | static class_stack_node_t current_class_stack; | |
105 | ||
c5a35c3c MM |
106 | /* The size of the largest empty class seen in this translation unit. */ |
107 | static GTY (()) tree sizeof_biggest_empty_class; | |
108 | ||
1f6e1acc AS |
109 | /* An array of all local classes present in this translation unit, in |
110 | declaration order. */ | |
806aa901 | 111 | VEC(tree,gc) *local_classes; |
1f6e1acc | 112 | |
94edc4ab NN |
113 | static tree get_vfield_name (tree); |
114 | static void finish_struct_anon (tree); | |
115 | static tree get_vtable_name (tree); | |
116 | static tree get_basefndecls (tree, tree); | |
117 | static int build_primary_vtable (tree, tree); | |
dbbf88d1 | 118 | static int build_secondary_vtable (tree); |
94edc4ab NN |
119 | static void finish_vtbls (tree); |
120 | static void modify_vtable_entry (tree, tree, tree, tree, tree *); | |
94edc4ab NN |
121 | static void finish_struct_bits (tree); |
122 | static int alter_access (tree, tree, tree); | |
123 | static void handle_using_decl (tree, tree); | |
94edc4ab NN |
124 | static tree dfs_modify_vtables (tree, void *); |
125 | static tree modify_all_vtables (tree, tree); | |
fc6633e0 | 126 | static void determine_primary_bases (tree); |
94edc4ab NN |
127 | static void finish_struct_methods (tree); |
128 | static void maybe_warn_about_overly_private_class (tree); | |
94edc4ab NN |
129 | static int method_name_cmp (const void *, const void *); |
130 | static int resort_method_name_cmp (const void *, const void *); | |
e5e459bf | 131 | static void add_implicitly_declared_members (tree, int, int); |
94edc4ab | 132 | static tree fixed_type_or_null (tree, int *, int *); |
92af500d NS |
133 | static tree resolve_address_of_overloaded_function (tree, tree, tsubst_flags_t, |
134 | bool, tree); | |
00bfffa4 | 135 | static tree build_simple_base_path (tree expr, tree binfo); |
94edc4ab NN |
136 | static tree build_vtbl_ref_1 (tree, tree); |
137 | static tree build_vtbl_initializer (tree, tree, tree, tree, int *); | |
138 | static int count_fields (tree); | |
d07605f5 | 139 | static int add_fields_to_record_type (tree, struct sorted_fields_type*, int); |
94edc4ab | 140 | static void check_bitfield_decl (tree); |
e5e459bf AO |
141 | static void check_field_decl (tree, tree, int *, int *, int *); |
142 | static void check_field_decls (tree, tree *, int *, int *); | |
58731fd1 MM |
143 | static tree *build_base_field (record_layout_info, tree, splay_tree, tree *); |
144 | static void build_base_fields (record_layout_info, splay_tree, tree *); | |
94edc4ab NN |
145 | static void check_methods (tree); |
146 | static void remove_zero_width_bit_fields (tree); | |
e5e459bf | 147 | static void check_bases (tree, int *, int *); |
58731fd1 MM |
148 | static void check_bases_and_members (tree); |
149 | static tree create_vtable_ptr (tree, tree *); | |
17bbb839 | 150 | static void include_empty_classes (record_layout_info); |
e93ee644 | 151 | static void layout_class_type (tree, tree *); |
94edc4ab NN |
152 | static void fixup_pending_inline (tree); |
153 | static void fixup_inline_methods (tree); | |
dbbf88d1 | 154 | static void propagate_binfo_offsets (tree, tree); |
17bbb839 | 155 | static void layout_virtual_bases (record_layout_info, splay_tree); |
94edc4ab NN |
156 | static void build_vbase_offset_vtbl_entries (tree, vtbl_init_data *); |
157 | static void add_vcall_offset_vtbl_entries_r (tree, vtbl_init_data *); | |
158 | static void add_vcall_offset_vtbl_entries_1 (tree, vtbl_init_data *); | |
159 | static void build_vcall_offset_vtbl_entries (tree, vtbl_init_data *); | |
e6a66567 | 160 | static void add_vcall_offset (tree, tree, vtbl_init_data *); |
94edc4ab | 161 | static void layout_vtable_decl (tree, int); |
5d5a519f | 162 | static tree dfs_find_final_overrider_pre (tree, void *); |
dbbf88d1 | 163 | static tree dfs_find_final_overrider_post (tree, void *); |
94edc4ab NN |
164 | static tree find_final_overrider (tree, tree, tree); |
165 | static int make_new_vtable (tree, tree); | |
166 | static int maybe_indent_hierarchy (FILE *, int, int); | |
dbbf88d1 | 167 | static tree dump_class_hierarchy_r (FILE *, int, tree, tree, int); |
94edc4ab | 168 | static void dump_class_hierarchy (tree); |
bb885938 | 169 | static void dump_class_hierarchy_1 (FILE *, int, tree); |
94edc4ab NN |
170 | static void dump_array (FILE *, tree); |
171 | static void dump_vtable (tree, tree, tree); | |
172 | static void dump_vtt (tree, tree); | |
bb885938 | 173 | static void dump_thunk (FILE *, int, tree); |
94edc4ab NN |
174 | static tree build_vtable (tree, tree, tree); |
175 | static void initialize_vtable (tree, tree); | |
94edc4ab | 176 | static void layout_nonempty_base_or_field (record_layout_info, |
5d5a519f | 177 | tree, tree, splay_tree); |
94edc4ab | 178 | static tree end_of_class (tree, int); |
dbbf88d1 | 179 | static bool layout_empty_base (tree, tree, splay_tree); |
94edc4ab NN |
180 | static void accumulate_vtbl_inits (tree, tree, tree, tree, tree); |
181 | static tree dfs_accumulate_vtbl_inits (tree, tree, tree, tree, | |
182 | tree); | |
183 | static void build_rtti_vtbl_entries (tree, vtbl_init_data *); | |
5d5a519f | 184 | static void build_vcall_and_vbase_vtbl_entries (tree, vtbl_init_data *); |
94edc4ab NN |
185 | static void clone_constructors_and_destructors (tree); |
186 | static tree build_clone (tree, tree); | |
a2ddc397 | 187 | static void update_vtable_entry_for_fn (tree, tree, tree, tree *, unsigned); |
94edc4ab NN |
188 | static void build_ctor_vtbl_group (tree, tree); |
189 | static void build_vtt (tree); | |
190 | static tree binfo_ctor_vtable (tree); | |
191 | static tree *build_vtt_inits (tree, tree, tree *, tree *); | |
192 | static tree dfs_build_secondary_vptr_vtt_inits (tree, void *); | |
94edc4ab | 193 | static tree dfs_fixup_binfo_vtbls (tree, void *); |
94edc4ab NN |
194 | static int record_subobject_offset (tree, tree, splay_tree); |
195 | static int check_subobject_offset (tree, tree, splay_tree); | |
196 | static int walk_subobject_offsets (tree, subobject_offset_fn, | |
5d5a519f | 197 | tree, splay_tree, tree, int); |
c5a35c3c | 198 | static void record_subobject_offsets (tree, tree, splay_tree, bool); |
94edc4ab NN |
199 | static int layout_conflict_p (tree, tree, splay_tree, int); |
200 | static int splay_tree_compare_integer_csts (splay_tree_key k1, | |
5d5a519f | 201 | splay_tree_key k2); |
94edc4ab NN |
202 | static void warn_about_ambiguous_bases (tree); |
203 | static bool type_requires_array_cookie (tree); | |
956d9305 | 204 | static bool contains_empty_class_p (tree); |
9368208b | 205 | static bool base_derived_from (tree, tree); |
7ba539c6 | 206 | static int empty_base_at_nonzero_offset_p (tree, tree, splay_tree); |
ba9a991f | 207 | static tree end_of_base (tree); |
548502d3 | 208 | static tree get_vcall_index (tree, tree); |
9965d119 | 209 | |
51c184be | 210 | /* Variables shared between class.c and call.c. */ |
8d08fdba | 211 | |
5566b478 | 212 | #ifdef GATHER_STATISTICS |
8d08fdba MS |
213 | int n_vtables = 0; |
214 | int n_vtable_entries = 0; | |
215 | int n_vtable_searches = 0; | |
216 | int n_vtable_elems = 0; | |
217 | int n_convert_harshness = 0; | |
218 | int n_compute_conversion_costs = 0; | |
8d08fdba | 219 | int n_inner_fields_searched = 0; |
5566b478 | 220 | #endif |
8d08fdba | 221 | |
338d90b8 NS |
222 | /* Convert to or from a base subobject. EXPR is an expression of type |
223 | `A' or `A*', an expression of type `B' or `B*' is returned. To | |
224 | convert A to a base B, CODE is PLUS_EXPR and BINFO is the binfo for | |
225 | the B base instance within A. To convert base A to derived B, CODE | |
226 | is MINUS_EXPR and BINFO is the binfo for the A instance within B. | |
227 | In this latter case, A must not be a morally virtual base of B. | |
228 | NONNULL is true if EXPR is known to be non-NULL (this is only | |
229 | needed when EXPR is of pointer type). CV qualifiers are preserved | |
230 | from EXPR. */ | |
ca36f057 MM |
231 | |
232 | tree | |
94edc4ab | 233 | build_base_path (enum tree_code code, |
0cbd7506 MS |
234 | tree expr, |
235 | tree binfo, | |
236 | int nonnull) | |
1a588ad7 | 237 | { |
338d90b8 | 238 | tree v_binfo = NULL_TREE; |
6bc34b14 | 239 | tree d_binfo = NULL_TREE; |
338d90b8 NS |
240 | tree probe; |
241 | tree offset; | |
242 | tree target_type; | |
243 | tree null_test = NULL; | |
244 | tree ptr_target_type; | |
ca36f057 | 245 | int fixed_type_p; |
338d90b8 | 246 | int want_pointer = TREE_CODE (TREE_TYPE (expr)) == POINTER_TYPE; |
00bfffa4 | 247 | bool has_empty = false; |
d7981fd9 | 248 | bool virtual_access; |
1a588ad7 | 249 | |
338d90b8 NS |
250 | if (expr == error_mark_node || binfo == error_mark_node || !binfo) |
251 | return error_mark_node; | |
6bc34b14 JM |
252 | |
253 | for (probe = binfo; probe; probe = BINFO_INHERITANCE_CHAIN (probe)) | |
254 | { | |
255 | d_binfo = probe; | |
00bfffa4 JM |
256 | if (is_empty_class (BINFO_TYPE (probe))) |
257 | has_empty = true; | |
809e3e7f | 258 | if (!v_binfo && BINFO_VIRTUAL_P (probe)) |
6bc34b14 JM |
259 | v_binfo = probe; |
260 | } | |
338d90b8 NS |
261 | |
262 | probe = TYPE_MAIN_VARIANT (TREE_TYPE (expr)); | |
263 | if (want_pointer) | |
264 | probe = TYPE_MAIN_VARIANT (TREE_TYPE (probe)); | |
00bfffa4 | 265 | |
539ed333 NS |
266 | gcc_assert ((code == MINUS_EXPR |
267 | && SAME_BINFO_TYPE_P (BINFO_TYPE (binfo), probe)) | |
268 | || (code == PLUS_EXPR | |
269 | && SAME_BINFO_TYPE_P (BINFO_TYPE (d_binfo), probe))); | |
c8094d83 | 270 | |
00bfffa4 JM |
271 | if (binfo == d_binfo) |
272 | /* Nothing to do. */ | |
273 | return expr; | |
274 | ||
338d90b8 NS |
275 | if (code == MINUS_EXPR && v_binfo) |
276 | { | |
1f070f2b | 277 | error ("cannot convert from base %qT to derived type %qT via virtual base %qT", |
6bc34b14 | 278 | BINFO_TYPE (binfo), BINFO_TYPE (d_binfo), BINFO_TYPE (v_binfo)); |
338d90b8 NS |
279 | return error_mark_node; |
280 | } | |
1a588ad7 | 281 | |
f576dfc4 JM |
282 | if (!want_pointer) |
283 | /* This must happen before the call to save_expr. */ | |
284 | expr = build_unary_op (ADDR_EXPR, expr, 0); | |
285 | ||
00bfffa4 | 286 | offset = BINFO_OFFSET (binfo); |
ca36f057 | 287 | fixed_type_p = resolves_to_fixed_type_p (expr, &nonnull); |
00bfffa4 | 288 | |
d7981fd9 JM |
289 | /* Do we need to look in the vtable for the real offset? */ |
290 | virtual_access = (v_binfo && fixed_type_p <= 0); | |
291 | ||
292 | /* Do we need to check for a null pointer? */ | |
293 | if (want_pointer && !nonnull && (virtual_access || !integer_zerop (offset))) | |
00bfffa4 JM |
294 | null_test = error_mark_node; |
295 | ||
d7981fd9 JM |
296 | /* Protect against multiple evaluation if necessary. */ |
297 | if (TREE_SIDE_EFFECTS (expr) && (null_test || virtual_access)) | |
ca36f057 | 298 | expr = save_expr (expr); |
f2606a97 | 299 | |
d7981fd9 | 300 | /* Now that we've saved expr, build the real null test. */ |
00bfffa4 | 301 | if (null_test) |
471a58a9 AP |
302 | { |
303 | tree zero = cp_convert (TREE_TYPE (expr), integer_zero_node); | |
7866705a SB |
304 | null_test = fold_build2 (NE_EXPR, boolean_type_node, |
305 | expr, zero); | |
471a58a9 | 306 | } |
00bfffa4 JM |
307 | |
308 | /* If this is a simple base reference, express it as a COMPONENT_REF. */ | |
d7981fd9 | 309 | if (code == PLUS_EXPR && !virtual_access |
00bfffa4 JM |
310 | /* We don't build base fields for empty bases, and they aren't very |
311 | interesting to the optimizers anyway. */ | |
312 | && !has_empty) | |
313 | { | |
314 | expr = build_indirect_ref (expr, NULL); | |
315 | expr = build_simple_base_path (expr, binfo); | |
316 | if (want_pointer) | |
442c8e31 | 317 | expr = build_address (expr); |
00bfffa4 JM |
318 | target_type = TREE_TYPE (expr); |
319 | goto out; | |
320 | } | |
321 | ||
d7981fd9 | 322 | if (virtual_access) |
1a588ad7 | 323 | { |
338d90b8 | 324 | /* Going via virtual base V_BINFO. We need the static offset |
0cbd7506 MS |
325 | from V_BINFO to BINFO, and the dynamic offset from D_BINFO to |
326 | V_BINFO. That offset is an entry in D_BINFO's vtable. */ | |
1f5a253a NS |
327 | tree v_offset; |
328 | ||
329 | if (fixed_type_p < 0 && in_base_initializer) | |
330 | { | |
2acb1af9 NS |
331 | /* In a base member initializer, we cannot rely on the |
332 | vtable being set up. We have to indirect via the | |
333 | vtt_parm. */ | |
6de9cd9a DN |
334 | tree t; |
335 | ||
2acb1af9 | 336 | t = TREE_TYPE (TYPE_VFIELD (current_class_type)); |
6de9cd9a DN |
337 | t = build_pointer_type (t); |
338 | v_offset = convert (t, current_vtt_parm); | |
6de9cd9a | 339 | v_offset = build_indirect_ref (v_offset, NULL); |
1f5a253a NS |
340 | } |
341 | else | |
342 | v_offset = build_vfield_ref (build_indirect_ref (expr, NULL), | |
343 | TREE_TYPE (TREE_TYPE (expr))); | |
c8094d83 | 344 | |
f293ce4b RS |
345 | v_offset = build2 (PLUS_EXPR, TREE_TYPE (v_offset), |
346 | v_offset, BINFO_VPTR_FIELD (v_binfo)); | |
c8094d83 | 347 | v_offset = build1 (NOP_EXPR, |
338d90b8 NS |
348 | build_pointer_type (ptrdiff_type_node), |
349 | v_offset); | |
350 | v_offset = build_indirect_ref (v_offset, NULL); | |
6de9cd9a DN |
351 | TREE_CONSTANT (v_offset) = 1; |
352 | TREE_INVARIANT (v_offset) = 1; | |
f63ab951 | 353 | |
7b6d72fc | 354 | offset = convert_to_integer (ptrdiff_type_node, |
c8094d83 | 355 | size_diffop (offset, |
7b6d72fc | 356 | BINFO_OFFSET (v_binfo))); |
8d08fdba | 357 | |
338d90b8 | 358 | if (!integer_zerop (offset)) |
f293ce4b | 359 | v_offset = build2 (code, ptrdiff_type_node, v_offset, offset); |
f2606a97 JM |
360 | |
361 | if (fixed_type_p < 0) | |
362 | /* Negative fixed_type_p means this is a constructor or destructor; | |
363 | virtual base layout is fixed in in-charge [cd]tors, but not in | |
364 | base [cd]tors. */ | |
f293ce4b RS |
365 | offset = build3 (COND_EXPR, ptrdiff_type_node, |
366 | build2 (EQ_EXPR, boolean_type_node, | |
367 | current_in_charge_parm, integer_zero_node), | |
368 | v_offset, | |
aa8f5c20 AP |
369 | convert_to_integer (ptrdiff_type_node, |
370 | BINFO_OFFSET (binfo))); | |
338d90b8 NS |
371 | else |
372 | offset = v_offset; | |
8d08fdba | 373 | } |
8d08fdba | 374 | |
6bc34b14 | 375 | target_type = code == PLUS_EXPR ? BINFO_TYPE (binfo) : BINFO_TYPE (d_binfo); |
c8094d83 | 376 | |
338d90b8 NS |
377 | target_type = cp_build_qualified_type |
378 | (target_type, cp_type_quals (TREE_TYPE (TREE_TYPE (expr)))); | |
379 | ptr_target_type = build_pointer_type (target_type); | |
380 | if (want_pointer) | |
381 | target_type = ptr_target_type; | |
c8094d83 | 382 | |
338d90b8 | 383 | expr = build1 (NOP_EXPR, ptr_target_type, expr); |
fed3cef0 | 384 | |
338d90b8 | 385 | if (!integer_zerop (offset)) |
f293ce4b | 386 | expr = build2 (code, ptr_target_type, expr, offset); |
8d08fdba | 387 | else |
338d90b8 | 388 | null_test = NULL; |
c8094d83 | 389 | |
338d90b8 NS |
390 | if (!want_pointer) |
391 | expr = build_indirect_ref (expr, NULL); | |
8d08fdba | 392 | |
00bfffa4 | 393 | out: |
338d90b8 | 394 | if (null_test) |
7866705a SB |
395 | expr = fold_build3 (COND_EXPR, target_type, null_test, expr, |
396 | fold_build1 (NOP_EXPR, target_type, | |
397 | integer_zero_node)); | |
f2606a97 | 398 | |
338d90b8 | 399 | return expr; |
8d08fdba MS |
400 | } |
401 | ||
00bfffa4 JM |
402 | /* Subroutine of build_base_path; EXPR and BINFO are as in that function. |
403 | Perform a derived-to-base conversion by recursively building up a | |
404 | sequence of COMPONENT_REFs to the appropriate base fields. */ | |
405 | ||
406 | static tree | |
407 | build_simple_base_path (tree expr, tree binfo) | |
408 | { | |
409 | tree type = BINFO_TYPE (binfo); | |
fc6633e0 | 410 | tree d_binfo = BINFO_INHERITANCE_CHAIN (binfo); |
00bfffa4 JM |
411 | tree field; |
412 | ||
00bfffa4 JM |
413 | if (d_binfo == NULL_TREE) |
414 | { | |
12a669d1 | 415 | tree temp; |
c8094d83 | 416 | |
8dc2b103 | 417 | gcc_assert (TYPE_MAIN_VARIANT (TREE_TYPE (expr)) == type); |
c8094d83 | 418 | |
12a669d1 | 419 | /* Transform `(a, b).x' into `(*(a, &b)).x', `(a ? b : c).x' |
0cbd7506 MS |
420 | into `(*(a ? &b : &c)).x', and so on. A COND_EXPR is only |
421 | an lvalue in the frontend; only _DECLs and _REFs are lvalues | |
422 | in the backend. */ | |
12a669d1 NS |
423 | temp = unary_complex_lvalue (ADDR_EXPR, expr); |
424 | if (temp) | |
425 | expr = build_indirect_ref (temp, NULL); | |
426 | ||
00bfffa4 JM |
427 | return expr; |
428 | } | |
429 | ||
430 | /* Recurse. */ | |
431 | expr = build_simple_base_path (expr, d_binfo); | |
432 | ||
433 | for (field = TYPE_FIELDS (BINFO_TYPE (d_binfo)); | |
434 | field; field = TREE_CHAIN (field)) | |
435 | /* Is this the base field created by build_base_field? */ | |
436 | if (TREE_CODE (field) == FIELD_DECL | |
642124c6 RH |
437 | && DECL_FIELD_IS_BASE (field) |
438 | && TREE_TYPE (field) == type) | |
12a669d1 NS |
439 | { |
440 | /* We don't use build_class_member_access_expr here, as that | |
441 | has unnecessary checks, and more importantly results in | |
442 | recursive calls to dfs_walk_once. */ | |
443 | int type_quals = cp_type_quals (TREE_TYPE (expr)); | |
444 | ||
445 | expr = build3 (COMPONENT_REF, | |
446 | cp_build_qualified_type (type, type_quals), | |
447 | expr, field, NULL_TREE); | |
448 | expr = fold_if_not_in_template (expr); | |
c8094d83 | 449 | |
12a669d1 NS |
450 | /* Mark the expression const or volatile, as appropriate. |
451 | Even though we've dealt with the type above, we still have | |
452 | to mark the expression itself. */ | |
453 | if (type_quals & TYPE_QUAL_CONST) | |
454 | TREE_READONLY (expr) = 1; | |
455 | if (type_quals & TYPE_QUAL_VOLATILE) | |
456 | TREE_THIS_VOLATILE (expr) = 1; | |
c8094d83 | 457 | |
12a669d1 NS |
458 | return expr; |
459 | } | |
00bfffa4 JM |
460 | |
461 | /* Didn't find the base field?!? */ | |
8dc2b103 | 462 | gcc_unreachable (); |
00bfffa4 JM |
463 | } |
464 | ||
08e17d9d MM |
465 | /* Convert OBJECT to the base TYPE. OBJECT is an expression whose |
466 | type is a class type or a pointer to a class type. In the former | |
467 | case, TYPE is also a class type; in the latter it is another | |
468 | pointer type. If CHECK_ACCESS is true, an error message is emitted | |
469 | if TYPE is inaccessible. If OBJECT has pointer type, the value is | |
470 | assumed to be non-NULL. */ | |
50ad9642 MM |
471 | |
472 | tree | |
08e17d9d | 473 | convert_to_base (tree object, tree type, bool check_access, bool nonnull) |
50ad9642 MM |
474 | { |
475 | tree binfo; | |
08e17d9d | 476 | tree object_type; |
50ad9642 | 477 | |
08e17d9d MM |
478 | if (TYPE_PTR_P (TREE_TYPE (object))) |
479 | { | |
480 | object_type = TREE_TYPE (TREE_TYPE (object)); | |
481 | type = TREE_TYPE (type); | |
482 | } | |
483 | else | |
484 | object_type = TREE_TYPE (object); | |
485 | ||
486 | binfo = lookup_base (object_type, type, | |
c8094d83 | 487 | check_access ? ba_check : ba_unique, |
50ad9642 | 488 | NULL); |
5bfc90de | 489 | if (!binfo || binfo == error_mark_node) |
50ad9642 MM |
490 | return error_mark_node; |
491 | ||
08e17d9d | 492 | return build_base_path (PLUS_EXPR, object, binfo, nonnull); |
50ad9642 MM |
493 | } |
494 | ||
539ed333 NS |
495 | /* EXPR is an expression with unqualified class type. BASE is a base |
496 | binfo of that class type. Returns EXPR, converted to the BASE | |
22ed7e5f MM |
497 | type. This function assumes that EXPR is the most derived class; |
498 | therefore virtual bases can be found at their static offsets. */ | |
499 | ||
500 | tree | |
501 | convert_to_base_statically (tree expr, tree base) | |
502 | { | |
503 | tree expr_type; | |
504 | ||
505 | expr_type = TREE_TYPE (expr); | |
539ed333 | 506 | if (!SAME_BINFO_TYPE_P (BINFO_TYPE (base), expr_type)) |
22ed7e5f MM |
507 | { |
508 | tree pointer_type; | |
509 | ||
510 | pointer_type = build_pointer_type (expr_type); | |
511 | expr = build_unary_op (ADDR_EXPR, expr, /*noconvert=*/1); | |
512 | if (!integer_zerop (BINFO_OFFSET (base))) | |
c8094d83 | 513 | expr = build2 (PLUS_EXPR, pointer_type, expr, |
f293ce4b | 514 | build_nop (pointer_type, BINFO_OFFSET (base))); |
22ed7e5f MM |
515 | expr = build_nop (build_pointer_type (BINFO_TYPE (base)), expr); |
516 | expr = build1 (INDIRECT_REF, BINFO_TYPE (base), expr); | |
517 | } | |
518 | ||
519 | return expr; | |
520 | } | |
521 | ||
f8361147 | 522 | \f |
981c353e RH |
523 | tree |
524 | build_vfield_ref (tree datum, tree type) | |
525 | { | |
526 | tree vfield, vcontext; | |
527 | ||
528 | if (datum == error_mark_node) | |
529 | return error_mark_node; | |
530 | ||
981c353e RH |
531 | /* First, convert to the requested type. */ |
532 | if (!same_type_ignoring_top_level_qualifiers_p (TREE_TYPE (datum), type)) | |
08e17d9d MM |
533 | datum = convert_to_base (datum, type, /*check_access=*/false, |
534 | /*nonnull=*/true); | |
981c353e RH |
535 | |
536 | /* Second, the requested type may not be the owner of its own vptr. | |
537 | If not, convert to the base class that owns it. We cannot use | |
538 | convert_to_base here, because VCONTEXT may appear more than once | |
5995ebfb | 539 | in the inheritance hierarchy of TYPE, and thus direct conversion |
981c353e RH |
540 | between the types may be ambiguous. Following the path back up |
541 | one step at a time via primary bases avoids the problem. */ | |
542 | vfield = TYPE_VFIELD (type); | |
543 | vcontext = DECL_CONTEXT (vfield); | |
544 | while (!same_type_ignoring_top_level_qualifiers_p (vcontext, type)) | |
545 | { | |
546 | datum = build_simple_base_path (datum, CLASSTYPE_PRIMARY_BINFO (type)); | |
547 | type = TREE_TYPE (datum); | |
548 | } | |
549 | ||
550 | return build3 (COMPONENT_REF, TREE_TYPE (vfield), datum, vfield, NULL_TREE); | |
551 | } | |
552 | ||
8d08fdba | 553 | /* Given an object INSTANCE, return an expression which yields the |
67231816 RH |
554 | vtable element corresponding to INDEX. There are many special |
555 | cases for INSTANCE which we take care of here, mainly to avoid | |
556 | creating extra tree nodes when we don't have to. */ | |
e92cc029 | 557 | |
4a8d0c9c | 558 | static tree |
94edc4ab | 559 | build_vtbl_ref_1 (tree instance, tree idx) |
8d08fdba | 560 | { |
f63ab951 JM |
561 | tree aref; |
562 | tree vtbl = NULL_TREE; | |
8d08fdba | 563 | |
f63ab951 JM |
564 | /* Try to figure out what a reference refers to, and |
565 | access its virtual function table directly. */ | |
566 | ||
567 | int cdtorp = 0; | |
568 | tree fixed_type = fixed_type_or_null (instance, NULL, &cdtorp); | |
569 | ||
ee76b931 | 570 | tree basetype = non_reference (TREE_TYPE (instance)); |
8d08fdba | 571 | |
f63ab951 | 572 | if (fixed_type && !cdtorp) |
8d08fdba | 573 | { |
f63ab951 | 574 | tree binfo = lookup_base (fixed_type, basetype, |
18e4be85 | 575 | ba_unique | ba_quiet, NULL); |
f63ab951 | 576 | if (binfo) |
6de9cd9a | 577 | vtbl = unshare_expr (BINFO_VTABLE (binfo)); |
f63ab951 | 578 | } |
8d08fdba | 579 | |
f63ab951 | 580 | if (!vtbl) |
dbbf88d1 | 581 | vtbl = build_vfield_ref (instance, basetype); |
c8094d83 | 582 | |
e3417fcd | 583 | assemble_external (vtbl); |
a1dd0d36 | 584 | |
8d08fdba | 585 | aref = build_array_ref (vtbl, idx); |
6de9cd9a DN |
586 | TREE_CONSTANT (aref) |= TREE_CONSTANT (vtbl) && TREE_CONSTANT (idx); |
587 | TREE_INVARIANT (aref) = TREE_CONSTANT (aref); | |
8d08fdba | 588 | |
c4372ef4 | 589 | return aref; |
8d08fdba MS |
590 | } |
591 | ||
4a8d0c9c | 592 | tree |
94edc4ab | 593 | build_vtbl_ref (tree instance, tree idx) |
4a8d0c9c RH |
594 | { |
595 | tree aref = build_vtbl_ref_1 (instance, idx); | |
596 | ||
4a8d0c9c RH |
597 | return aref; |
598 | } | |
599 | ||
0f59171d RH |
600 | /* Given a stable object pointer INSTANCE_PTR, return an expression which |
601 | yields a function pointer corresponding to vtable element INDEX. */ | |
67231816 RH |
602 | |
603 | tree | |
0f59171d | 604 | build_vfn_ref (tree instance_ptr, tree idx) |
67231816 | 605 | { |
0f59171d RH |
606 | tree aref; |
607 | ||
608 | aref = build_vtbl_ref_1 (build_indirect_ref (instance_ptr, 0), idx); | |
67231816 RH |
609 | |
610 | /* When using function descriptors, the address of the | |
611 | vtable entry is treated as a function pointer. */ | |
612 | if (TARGET_VTABLE_USES_DESCRIPTORS) | |
4a8d0c9c | 613 | aref = build1 (NOP_EXPR, TREE_TYPE (aref), |
67231816 RH |
614 | build_unary_op (ADDR_EXPR, aref, /*noconvert=*/1)); |
615 | ||
0f59171d | 616 | /* Remember this as a method reference, for later devirtualization. */ |
f293ce4b | 617 | aref = build3 (OBJ_TYPE_REF, TREE_TYPE (aref), aref, instance_ptr, idx); |
0f59171d | 618 | |
67231816 RH |
619 | return aref; |
620 | } | |
621 | ||
669ec2b4 JM |
622 | /* Return the name of the virtual function table (as an IDENTIFIER_NODE) |
623 | for the given TYPE. */ | |
624 | ||
625 | static tree | |
94edc4ab | 626 | get_vtable_name (tree type) |
669ec2b4 | 627 | { |
1f84ec23 | 628 | return mangle_vtbl_for_type (type); |
669ec2b4 JM |
629 | } |
630 | ||
631 | /* Return an IDENTIFIER_NODE for the name of the virtual table table | |
632 | for TYPE. */ | |
633 | ||
634 | tree | |
94edc4ab | 635 | get_vtt_name (tree type) |
669ec2b4 | 636 | { |
1f84ec23 | 637 | return mangle_vtt_for_type (type); |
669ec2b4 JM |
638 | } |
639 | ||
4684cd27 MM |
640 | /* DECL is an entity associated with TYPE, like a virtual table or an |
641 | implicitly generated constructor. Determine whether or not DECL | |
642 | should have external or internal linkage at the object file | |
643 | level. This routine does not deal with COMDAT linkage and other | |
644 | similar complexities; it simply sets TREE_PUBLIC if it possible for | |
645 | entities in other translation units to contain copies of DECL, in | |
646 | the abstract. */ | |
647 | ||
648 | void | |
649 | set_linkage_according_to_type (tree type, tree decl) | |
650 | { | |
651 | /* If TYPE involves a local class in a function with internal | |
652 | linkage, then DECL should have internal linkage too. Other local | |
653 | classes have no linkage -- but if their containing functions | |
654 | have external linkage, it makes sense for DECL to have external | |
655 | linkage too. That will allow template definitions to be merged, | |
656 | for example. */ | |
657 | if (no_linkage_check (type, /*relaxed_p=*/true)) | |
658 | { | |
659 | TREE_PUBLIC (decl) = 0; | |
660 | DECL_INTERFACE_KNOWN (decl) = 1; | |
661 | } | |
662 | else | |
663 | TREE_PUBLIC (decl) = 1; | |
664 | } | |
665 | ||
459c43ad MM |
666 | /* Create a VAR_DECL for a primary or secondary vtable for CLASS_TYPE. |
667 | (For a secondary vtable for B-in-D, CLASS_TYPE should be D, not B.) | |
668 | Use NAME for the name of the vtable, and VTABLE_TYPE for its type. */ | |
b9f39201 MM |
669 | |
670 | static tree | |
94edc4ab | 671 | build_vtable (tree class_type, tree name, tree vtable_type) |
b9f39201 MM |
672 | { |
673 | tree decl; | |
674 | ||
675 | decl = build_lang_decl (VAR_DECL, name, vtable_type); | |
90ecce3e JM |
676 | /* vtable names are already mangled; give them their DECL_ASSEMBLER_NAME |
677 | now to avoid confusion in mangle_decl. */ | |
678 | SET_DECL_ASSEMBLER_NAME (decl, name); | |
b9f39201 MM |
679 | DECL_CONTEXT (decl) = class_type; |
680 | DECL_ARTIFICIAL (decl) = 1; | |
681 | TREE_STATIC (decl) = 1; | |
b9f39201 | 682 | TREE_READONLY (decl) = 1; |
b9f39201 | 683 | DECL_VIRTUAL_P (decl) = 1; |
a6f5e048 | 684 | DECL_ALIGN (decl) = TARGET_VTABLE_ENTRY_ALIGN; |
d35543c0 | 685 | DECL_VTABLE_OR_VTT_P (decl) = 1; |
78d55cc8 JM |
686 | /* At one time the vtable info was grabbed 2 words at a time. This |
687 | fails on sparc unless you have 8-byte alignment. (tiemann) */ | |
688 | DECL_ALIGN (decl) = MAX (TYPE_ALIGN (double_type_node), | |
689 | DECL_ALIGN (decl)); | |
4684cd27 MM |
690 | set_linkage_according_to_type (class_type, decl); |
691 | /* The vtable has not been defined -- yet. */ | |
692 | DECL_EXTERNAL (decl) = 1; | |
693 | DECL_NOT_REALLY_EXTERN (decl) = 1; | |
694 | ||
78e0d62b RH |
695 | /* Mark the VAR_DECL node representing the vtable itself as a |
696 | "gratuitous" one, thereby forcing dwarfout.c to ignore it. It | |
697 | is rather important that such things be ignored because any | |
698 | effort to actually generate DWARF for them will run into | |
699 | trouble when/if we encounter code like: | |
c8094d83 | 700 | |
78e0d62b RH |
701 | #pragma interface |
702 | struct S { virtual void member (); }; | |
c8094d83 | 703 | |
78e0d62b RH |
704 | because the artificial declaration of the vtable itself (as |
705 | manufactured by the g++ front end) will say that the vtable is | |
706 | a static member of `S' but only *after* the debug output for | |
707 | the definition of `S' has already been output. This causes | |
708 | grief because the DWARF entry for the definition of the vtable | |
709 | will try to refer back to an earlier *declaration* of the | |
710 | vtable as a static member of `S' and there won't be one. We | |
711 | might be able to arrange to have the "vtable static member" | |
712 | attached to the member list for `S' before the debug info for | |
713 | `S' get written (which would solve the problem) but that would | |
714 | require more intrusive changes to the g++ front end. */ | |
715 | DECL_IGNORED_P (decl) = 1; | |
78d55cc8 | 716 | |
b9f39201 MM |
717 | return decl; |
718 | } | |
719 | ||
1aa4ccd4 NS |
720 | /* Get the VAR_DECL of the vtable for TYPE. TYPE need not be polymorphic, |
721 | or even complete. If this does not exist, create it. If COMPLETE is | |
838dfd8a | 722 | nonzero, then complete the definition of it -- that will render it |
1aa4ccd4 NS |
723 | impossible to actually build the vtable, but is useful to get at those |
724 | which are known to exist in the runtime. */ | |
725 | ||
c8094d83 | 726 | tree |
94edc4ab | 727 | get_vtable_decl (tree type, int complete) |
1aa4ccd4 | 728 | { |
548502d3 MM |
729 | tree decl; |
730 | ||
731 | if (CLASSTYPE_VTABLES (type)) | |
732 | return CLASSTYPE_VTABLES (type); | |
c8094d83 | 733 | |
d1a74aa7 | 734 | decl = build_vtable (type, get_vtable_name (type), vtbl_type_node); |
548502d3 MM |
735 | CLASSTYPE_VTABLES (type) = decl; |
736 | ||
1aa4ccd4 | 737 | if (complete) |
217f4eb9 MM |
738 | { |
739 | DECL_EXTERNAL (decl) = 1; | |
740 | cp_finish_decl (decl, NULL_TREE, NULL_TREE, 0); | |
741 | } | |
1aa4ccd4 | 742 | |
1aa4ccd4 NS |
743 | return decl; |
744 | } | |
745 | ||
28531dd0 MM |
746 | /* Build the primary virtual function table for TYPE. If BINFO is |
747 | non-NULL, build the vtable starting with the initial approximation | |
748 | that it is the same as the one which is the head of the association | |
838dfd8a | 749 | list. Returns a nonzero value if a new vtable is actually |
28531dd0 | 750 | created. */ |
e92cc029 | 751 | |
28531dd0 | 752 | static int |
94edc4ab | 753 | build_primary_vtable (tree binfo, tree type) |
8d08fdba | 754 | { |
31f8e4f3 MM |
755 | tree decl; |
756 | tree virtuals; | |
8d08fdba | 757 | |
1aa4ccd4 | 758 | decl = get_vtable_decl (type, /*complete=*/0); |
c8094d83 | 759 | |
8d08fdba MS |
760 | if (binfo) |
761 | { | |
dbbf88d1 | 762 | if (BINFO_NEW_VTABLE_MARKED (binfo)) |
0533d788 MM |
763 | /* We have already created a vtable for this base, so there's |
764 | no need to do it again. */ | |
28531dd0 | 765 | return 0; |
c8094d83 | 766 | |
d1f05f93 | 767 | virtuals = copy_list (BINFO_VIRTUALS (binfo)); |
c35cce41 MM |
768 | TREE_TYPE (decl) = TREE_TYPE (get_vtbl_decl_for_binfo (binfo)); |
769 | DECL_SIZE (decl) = TYPE_SIZE (TREE_TYPE (decl)); | |
770 | DECL_SIZE_UNIT (decl) = TYPE_SIZE_UNIT (TREE_TYPE (decl)); | |
8d08fdba MS |
771 | } |
772 | else | |
773 | { | |
50bc768d | 774 | gcc_assert (TREE_TYPE (decl) == vtbl_type_node); |
8d08fdba | 775 | virtuals = NULL_TREE; |
8d08fdba MS |
776 | } |
777 | ||
778 | #ifdef GATHER_STATISTICS | |
779 | n_vtables += 1; | |
780 | n_vtable_elems += list_length (virtuals); | |
781 | #endif | |
782 | ||
8d08fdba MS |
783 | /* Initialize the association list for this type, based |
784 | on our first approximation. */ | |
604a3205 NS |
785 | BINFO_VTABLE (TYPE_BINFO (type)) = decl; |
786 | BINFO_VIRTUALS (TYPE_BINFO (type)) = virtuals; | |
dbbf88d1 | 787 | SET_BINFO_NEW_VTABLE_MARKED (TYPE_BINFO (type)); |
28531dd0 | 788 | return 1; |
8d08fdba MS |
789 | } |
790 | ||
3461fba7 | 791 | /* Give BINFO a new virtual function table which is initialized |
8d08fdba MS |
792 | with a skeleton-copy of its original initialization. The only |
793 | entry that changes is the `delta' entry, so we can really | |
794 | share a lot of structure. | |
795 | ||
3461fba7 | 796 | FOR_TYPE is the most derived type which caused this table to |
8d08fdba MS |
797 | be needed. |
798 | ||
838dfd8a | 799 | Returns nonzero if we haven't met BINFO before. |
2636fde4 JM |
800 | |
801 | The order in which vtables are built (by calling this function) for | |
802 | an object must remain the same, otherwise a binary incompatibility | |
803 | can result. */ | |
e92cc029 | 804 | |
28531dd0 | 805 | static int |
dbbf88d1 | 806 | build_secondary_vtable (tree binfo) |
8d08fdba | 807 | { |
dbbf88d1 | 808 | if (BINFO_NEW_VTABLE_MARKED (binfo)) |
0533d788 MM |
809 | /* We already created a vtable for this base. There's no need to |
810 | do it again. */ | |
28531dd0 | 811 | return 0; |
0533d788 | 812 | |
8d7a5379 MM |
813 | /* Remember that we've created a vtable for this BINFO, so that we |
814 | don't try to do so again. */ | |
dbbf88d1 | 815 | SET_BINFO_NEW_VTABLE_MARKED (binfo); |
c8094d83 | 816 | |
8d7a5379 | 817 | /* Make fresh virtual list, so we can smash it later. */ |
d1f05f93 | 818 | BINFO_VIRTUALS (binfo) = copy_list (BINFO_VIRTUALS (binfo)); |
8d7a5379 | 819 | |
3461fba7 NS |
820 | /* Secondary vtables are laid out as part of the same structure as |
821 | the primary vtable. */ | |
822 | BINFO_VTABLE (binfo) = NULL_TREE; | |
28531dd0 | 823 | return 1; |
8d08fdba MS |
824 | } |
825 | ||
28531dd0 | 826 | /* Create a new vtable for BINFO which is the hierarchy dominated by |
838dfd8a | 827 | T. Return nonzero if we actually created a new vtable. */ |
28531dd0 MM |
828 | |
829 | static int | |
94edc4ab | 830 | make_new_vtable (tree t, tree binfo) |
28531dd0 MM |
831 | { |
832 | if (binfo == TYPE_BINFO (t)) | |
833 | /* In this case, it is *type*'s vtable we are modifying. We start | |
d0cd8b44 | 834 | with the approximation that its vtable is that of the |
28531dd0 | 835 | immediate base class. */ |
981c353e | 836 | return build_primary_vtable (binfo, t); |
28531dd0 MM |
837 | else |
838 | /* This is our very own copy of `basetype' to play with. Later, | |
839 | we will fill in all the virtual functions that override the | |
840 | virtual functions in these base classes which are not defined | |
841 | by the current type. */ | |
dbbf88d1 | 842 | return build_secondary_vtable (binfo); |
28531dd0 MM |
843 | } |
844 | ||
845 | /* Make *VIRTUALS, an entry on the BINFO_VIRTUALS list for BINFO | |
846 | (which is in the hierarchy dominated by T) list FNDECL as its | |
4e7512c9 MM |
847 | BV_FN. DELTA is the required constant adjustment from the `this' |
848 | pointer where the vtable entry appears to the `this' required when | |
849 | the function is actually called. */ | |
8d08fdba MS |
850 | |
851 | static void | |
94edc4ab | 852 | modify_vtable_entry (tree t, |
0cbd7506 MS |
853 | tree binfo, |
854 | tree fndecl, | |
855 | tree delta, | |
856 | tree *virtuals) | |
8d08fdba | 857 | { |
28531dd0 | 858 | tree v; |
c0bbf652 | 859 | |
28531dd0 | 860 | v = *virtuals; |
c0bbf652 | 861 | |
5e19c053 | 862 | if (fndecl != BV_FN (v) |
4e7512c9 | 863 | || !tree_int_cst_equal (delta, BV_DELTA (v))) |
c0bbf652 | 864 | { |
28531dd0 MM |
865 | /* We need a new vtable for BINFO. */ |
866 | if (make_new_vtable (t, binfo)) | |
867 | { | |
868 | /* If we really did make a new vtable, we also made a copy | |
869 | of the BINFO_VIRTUALS list. Now, we have to find the | |
870 | corresponding entry in that list. */ | |
871 | *virtuals = BINFO_VIRTUALS (binfo); | |
5e19c053 | 872 | while (BV_FN (*virtuals) != BV_FN (v)) |
28531dd0 MM |
873 | *virtuals = TREE_CHAIN (*virtuals); |
874 | v = *virtuals; | |
875 | } | |
8d08fdba | 876 | |
5e19c053 | 877 | BV_DELTA (v) = delta; |
aabb4cd6 | 878 | BV_VCALL_INDEX (v) = NULL_TREE; |
5e19c053 | 879 | BV_FN (v) = fndecl; |
8d08fdba | 880 | } |
8d08fdba MS |
881 | } |
882 | ||
8d08fdba | 883 | \f |
b2a9b208 | 884 | /* Add method METHOD to class TYPE. If USING_DECL is non-null, it is |
b77fe7b4 NS |
885 | the USING_DECL naming METHOD. Returns true if the method could be |
886 | added to the method vec. */ | |
e92cc029 | 887 | |
b77fe7b4 | 888 | bool |
b2a9b208 | 889 | add_method (tree type, tree method, tree using_decl) |
8d08fdba | 890 | { |
9ba5ff0f | 891 | unsigned slot; |
90ea9897 | 892 | tree overload; |
b54a07e8 NS |
893 | bool template_conv_p = false; |
894 | bool conv_p; | |
d4e6fecb | 895 | VEC(tree,gc) *method_vec; |
aaaa46d2 | 896 | bool complete_p; |
9ba5ff0f NS |
897 | bool insert_p = false; |
898 | tree current_fns; | |
ac2b3222 AP |
899 | |
900 | if (method == error_mark_node) | |
b77fe7b4 | 901 | return false; |
aaaa46d2 MM |
902 | |
903 | complete_p = COMPLETE_TYPE_P (type); | |
b54a07e8 NS |
904 | conv_p = DECL_CONV_FN_P (method); |
905 | if (conv_p) | |
906 | template_conv_p = (TREE_CODE (method) == TEMPLATE_DECL | |
907 | && DECL_TEMPLATE_CONV_FN_P (method)); | |
452a394b | 908 | |
452a394b | 909 | method_vec = CLASSTYPE_METHOD_VEC (type); |
aaaa46d2 MM |
910 | if (!method_vec) |
911 | { | |
912 | /* Make a new method vector. We start with 8 entries. We must | |
913 | allocate at least two (for constructors and destructors), and | |
914 | we're going to end up with an assignment operator at some | |
915 | point as well. */ | |
d4e6fecb | 916 | method_vec = VEC_alloc (tree, gc, 8); |
aaaa46d2 MM |
917 | /* Create slots for constructors and destructors. */ |
918 | VEC_quick_push (tree, method_vec, NULL_TREE); | |
919 | VEC_quick_push (tree, method_vec, NULL_TREE); | |
920 | CLASSTYPE_METHOD_VEC (type) = method_vec; | |
921 | } | |
922 | ||
452a394b MM |
923 | /* Constructors and destructors go in special slots. */ |
924 | if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (method)) | |
925 | slot = CLASSTYPE_CONSTRUCTOR_SLOT; | |
926 | else if (DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P (method)) | |
4b0d3cbe MM |
927 | { |
928 | slot = CLASSTYPE_DESTRUCTOR_SLOT; | |
c8094d83 | 929 | |
f5c28a15 | 930 | if (TYPE_FOR_JAVA (type)) |
9f4faeae MM |
931 | { |
932 | if (!DECL_ARTIFICIAL (method)) | |
933 | error ("Java class %qT cannot have a destructor", type); | |
934 | else if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type)) | |
935 | error ("Java class %qT cannot have an implicit non-trivial " | |
936 | "destructor", | |
937 | type); | |
938 | } | |
4b0d3cbe | 939 | } |
452a394b | 940 | else |
61a127b3 | 941 | { |
aaaa46d2 MM |
942 | tree m; |
943 | ||
9ba5ff0f | 944 | insert_p = true; |
452a394b | 945 | /* See if we already have an entry with this name. */ |
c8094d83 | 946 | for (slot = CLASSTYPE_FIRST_CONVERSION_SLOT; |
9ba5ff0f | 947 | VEC_iterate (tree, method_vec, slot, m); |
aaaa46d2 | 948 | ++slot) |
5dd236e2 | 949 | { |
5dd236e2 | 950 | m = OVL_CURRENT (m); |
5dd236e2 NS |
951 | if (template_conv_p) |
952 | { | |
aaaa46d2 MM |
953 | if (TREE_CODE (m) == TEMPLATE_DECL |
954 | && DECL_TEMPLATE_CONV_FN_P (m)) | |
955 | insert_p = false; | |
5dd236e2 NS |
956 | break; |
957 | } | |
aaaa46d2 | 958 | if (conv_p && !DECL_CONV_FN_P (m)) |
5dd236e2 | 959 | break; |
aaaa46d2 | 960 | if (DECL_NAME (m) == DECL_NAME (method)) |
452a394b | 961 | { |
aaaa46d2 MM |
962 | insert_p = false; |
963 | break; | |
8d08fdba | 964 | } |
aaaa46d2 MM |
965 | if (complete_p |
966 | && !DECL_CONV_FN_P (m) | |
967 | && DECL_NAME (m) > DECL_NAME (method)) | |
968 | break; | |
61a127b3 | 969 | } |
452a394b | 970 | } |
9ba5ff0f | 971 | current_fns = insert_p ? NULL_TREE : VEC_index (tree, method_vec, slot); |
c8094d83 | 972 | |
c353b8e3 | 973 | if (processing_template_decl) |
452a394b MM |
974 | /* TYPE is a template class. Don't issue any errors now; wait |
975 | until instantiation time to complain. */ | |
976 | ; | |
977 | else | |
978 | { | |
979 | tree fns; | |
03017874 | 980 | |
452a394b | 981 | /* Check to see if we've already got this method. */ |
9ba5ff0f | 982 | for (fns = current_fns; fns; fns = OVL_NEXT (fns)) |
452a394b MM |
983 | { |
984 | tree fn = OVL_CURRENT (fns); | |
6b20b203 MM |
985 | tree fn_type; |
986 | tree method_type; | |
f0ab6bf2 MM |
987 | tree parms1; |
988 | tree parms2; | |
f0ab6bf2 | 989 | |
452a394b MM |
990 | if (TREE_CODE (fn) != TREE_CODE (method)) |
991 | continue; | |
03017874 | 992 | |
f0ab6bf2 MM |
993 | /* [over.load] Member function declarations with the |
994 | same name and the same parameter types cannot be | |
995 | overloaded if any of them is a static member | |
996 | function declaration. | |
997 | ||
998 | [namespace.udecl] When a using-declaration brings names | |
999 | from a base class into a derived class scope, member | |
1000 | functions in the derived class override and/or hide member | |
1001 | functions with the same name and parameter types in a base | |
1002 | class (rather than conflicting). */ | |
6b20b203 MM |
1003 | fn_type = TREE_TYPE (fn); |
1004 | method_type = TREE_TYPE (method); | |
1005 | parms1 = TYPE_ARG_TYPES (fn_type); | |
1006 | parms2 = TYPE_ARG_TYPES (method_type); | |
f0ab6bf2 MM |
1007 | |
1008 | /* Compare the quals on the 'this' parm. Don't compare | |
1009 | the whole types, as used functions are treated as | |
1010 | coming from the using class in overload resolution. */ | |
1011 | if (! DECL_STATIC_FUNCTION_P (fn) | |
1012 | && ! DECL_STATIC_FUNCTION_P (method) | |
1013 | && (TYPE_QUALS (TREE_TYPE (TREE_VALUE (parms1))) | |
1014 | != TYPE_QUALS (TREE_TYPE (TREE_VALUE (parms2))))) | |
6b20b203 | 1015 | continue; |
c8094d83 | 1016 | |
6b20b203 MM |
1017 | /* For templates, the return type and template parameters |
1018 | must be identical. */ | |
8a188e24 | 1019 | if (TREE_CODE (fn) == TEMPLATE_DECL |
6b20b203 MM |
1020 | && (!same_type_p (TREE_TYPE (fn_type), |
1021 | TREE_TYPE (method_type)) | |
1022 | || !comp_template_parms (DECL_TEMPLATE_PARMS (fn), | |
1023 | DECL_TEMPLATE_PARMS (method)))) | |
1024 | continue; | |
c8094d83 | 1025 | |
f0ab6bf2 MM |
1026 | if (! DECL_STATIC_FUNCTION_P (fn)) |
1027 | parms1 = TREE_CHAIN (parms1); | |
1028 | if (! DECL_STATIC_FUNCTION_P (method)) | |
1029 | parms2 = TREE_CHAIN (parms2); | |
1030 | ||
6b20b203 | 1031 | if (compparms (parms1, parms2) |
c8094d83 | 1032 | && (!DECL_CONV_FN_P (fn) |
6b20b203 MM |
1033 | || same_type_p (TREE_TYPE (fn_type), |
1034 | TREE_TYPE (method_type)))) | |
452a394b | 1035 | { |
b2a9b208 NS |
1036 | if (using_decl) |
1037 | { | |
1038 | if (DECL_CONTEXT (fn) == type) | |
1039 | /* Defer to the local function. */ | |
b77fe7b4 | 1040 | return false; |
b2a9b208 | 1041 | if (DECL_CONTEXT (fn) == DECL_CONTEXT (method)) |
dee15844 | 1042 | error ("repeated using declaration %q+D", using_decl); |
b2a9b208 | 1043 | else |
dee15844 JM |
1044 | error ("using declaration %q+D conflicts with a previous using declaration", |
1045 | using_decl); | |
b2a9b208 | 1046 | } |
f0ab6bf2 | 1047 | else |
03017874 | 1048 | { |
dee15844 JM |
1049 | error ("%q+#D cannot be overloaded", method); |
1050 | error ("with %q+#D", fn); | |
03017874 | 1051 | } |
c8094d83 | 1052 | |
b2a9b208 NS |
1053 | /* We don't call duplicate_decls here to merge the |
1054 | declarations because that will confuse things if the | |
1055 | methods have inline definitions. In particular, we | |
1056 | will crash while processing the definitions. */ | |
b77fe7b4 | 1057 | return false; |
452a394b | 1058 | } |
03017874 | 1059 | } |
452a394b | 1060 | } |
03017874 | 1061 | |
c8094d83 | 1062 | /* Add the new binding. */ |
9ba5ff0f | 1063 | overload = build_overload (method, current_fns); |
c8094d83 | 1064 | |
b54a07e8 | 1065 | if (!conv_p && slot >= CLASSTYPE_FIRST_CONVERSION_SLOT && !complete_p) |
90ea9897 MM |
1066 | push_class_level_binding (DECL_NAME (method), overload); |
1067 | ||
9ba5ff0f NS |
1068 | if (insert_p) |
1069 | { | |
1070 | /* We only expect to add few methods in the COMPLETE_P case, so | |
1071 | just make room for one more method in that case. */ | |
d4e6fecb | 1072 | if (VEC_reserve (tree, gc, method_vec, complete_p ? -1 : 1)) |
9ba5ff0f NS |
1073 | CLASSTYPE_METHOD_VEC (type) = method_vec; |
1074 | if (slot == VEC_length (tree, method_vec)) | |
1075 | VEC_quick_push (tree, method_vec, overload); | |
1076 | else | |
1077 | VEC_quick_insert (tree, method_vec, slot, overload); | |
1078 | } | |
1079 | else | |
03fd3f84 | 1080 | /* Replace the current slot. */ |
9ba5ff0f | 1081 | VEC_replace (tree, method_vec, slot, overload); |
b77fe7b4 | 1082 | return true; |
8d08fdba MS |
1083 | } |
1084 | ||
1085 | /* Subroutines of finish_struct. */ | |
1086 | ||
aa52c1ff JM |
1087 | /* Change the access of FDECL to ACCESS in T. Return 1 if change was |
1088 | legit, otherwise return 0. */ | |
e92cc029 | 1089 | |
8d08fdba | 1090 | static int |
94edc4ab | 1091 | alter_access (tree t, tree fdecl, tree access) |
8d08fdba | 1092 | { |
721c3b42 MM |
1093 | tree elem; |
1094 | ||
1095 | if (!DECL_LANG_SPECIFIC (fdecl)) | |
1096 | retrofit_lang_decl (fdecl); | |
1097 | ||
50bc768d | 1098 | gcc_assert (!DECL_DISCRIMINATOR_P (fdecl)); |
8e4ce833 | 1099 | |
721c3b42 | 1100 | elem = purpose_member (t, DECL_ACCESS (fdecl)); |
38afd588 | 1101 | if (elem) |
8d08fdba | 1102 | { |
38afd588 | 1103 | if (TREE_VALUE (elem) != access) |
8d08fdba | 1104 | { |
38afd588 | 1105 | if (TREE_CODE (TREE_TYPE (fdecl)) == FUNCTION_DECL) |
dee15844 JM |
1106 | error ("conflicting access specifications for method" |
1107 | " %q+D, ignored", TREE_TYPE (fdecl)); | |
38afd588 | 1108 | else |
1f070f2b | 1109 | error ("conflicting access specifications for field %qE, ignored", |
4460cef2 | 1110 | DECL_NAME (fdecl)); |
8d08fdba MS |
1111 | } |
1112 | else | |
430bb96b JL |
1113 | { |
1114 | /* They're changing the access to the same thing they changed | |
1115 | it to before. That's OK. */ | |
1116 | ; | |
1117 | } | |
db5ae43f | 1118 | } |
38afd588 | 1119 | else |
8d08fdba | 1120 | { |
6df5158a | 1121 | perform_or_defer_access_check (TYPE_BINFO (t), fdecl); |
be99da77 | 1122 | DECL_ACCESS (fdecl) = tree_cons (t, access, DECL_ACCESS (fdecl)); |
8d08fdba MS |
1123 | return 1; |
1124 | } | |
1125 | return 0; | |
1126 | } | |
1127 | ||
58010b57 | 1128 | /* Process the USING_DECL, which is a member of T. */ |
79ad62b2 | 1129 | |
e9659ab0 | 1130 | static void |
94edc4ab | 1131 | handle_using_decl (tree using_decl, tree t) |
79ad62b2 | 1132 | { |
98ed9dae | 1133 | tree decl = USING_DECL_DECLS (using_decl); |
79ad62b2 MM |
1134 | tree name = DECL_NAME (using_decl); |
1135 | tree access | |
1136 | = TREE_PRIVATE (using_decl) ? access_private_node | |
1137 | : TREE_PROTECTED (using_decl) ? access_protected_node | |
1138 | : access_public_node; | |
79ad62b2 | 1139 | tree flist = NULL_TREE; |
aa52c1ff | 1140 | tree old_value; |
79ad62b2 | 1141 | |
98ed9dae | 1142 | gcc_assert (!processing_template_decl && decl); |
c8094d83 | 1143 | |
39fb05d0 | 1144 | old_value = lookup_member (t, name, /*protect=*/0, /*want_type=*/false); |
aa52c1ff | 1145 | if (old_value) |
79ad62b2 | 1146 | { |
aa52c1ff JM |
1147 | if (is_overloaded_fn (old_value)) |
1148 | old_value = OVL_CURRENT (old_value); | |
1149 | ||
1150 | if (DECL_P (old_value) && DECL_CONTEXT (old_value) == t) | |
1151 | /* OK */; | |
1152 | else | |
1153 | old_value = NULL_TREE; | |
79ad62b2 | 1154 | } |
c8094d83 | 1155 | |
98ed9dae | 1156 | cp_emit_debug_info_for_using (decl, current_class_type); |
c8094d83 | 1157 | |
98ed9dae NS |
1158 | if (is_overloaded_fn (decl)) |
1159 | flist = decl; | |
aa52c1ff JM |
1160 | |
1161 | if (! old_value) | |
1162 | ; | |
1163 | else if (is_overloaded_fn (old_value)) | |
79ad62b2 | 1164 | { |
aa52c1ff JM |
1165 | if (flist) |
1166 | /* It's OK to use functions from a base when there are functions with | |
1167 | the same name already present in the current class. */; | |
1168 | else | |
79ad62b2 | 1169 | { |
dee15844 JM |
1170 | error ("%q+D invalid in %q#T", using_decl, t); |
1171 | error (" because of local method %q+#D with same name", | |
1172 | OVL_CURRENT (old_value)); | |
aa52c1ff | 1173 | return; |
79ad62b2 MM |
1174 | } |
1175 | } | |
186c0fbe | 1176 | else if (!DECL_ARTIFICIAL (old_value)) |
aa52c1ff | 1177 | { |
dee15844 JM |
1178 | error ("%q+D invalid in %q#T", using_decl, t); |
1179 | error (" because of local member %q+#D with same name", old_value); | |
aa52c1ff JM |
1180 | return; |
1181 | } | |
c8094d83 | 1182 | |
f4f206f4 | 1183 | /* Make type T see field decl FDECL with access ACCESS. */ |
aa52c1ff JM |
1184 | if (flist) |
1185 | for (; flist; flist = OVL_NEXT (flist)) | |
1186 | { | |
b2a9b208 | 1187 | add_method (t, OVL_CURRENT (flist), using_decl); |
aa52c1ff JM |
1188 | alter_access (t, OVL_CURRENT (flist), access); |
1189 | } | |
1190 | else | |
98ed9dae | 1191 | alter_access (t, decl, access); |
79ad62b2 | 1192 | } |
8d08fdba | 1193 | \f |
e5e459bf AO |
1194 | /* Run through the base classes of T, updating CANT_HAVE_CONST_CTOR_P, |
1195 | and NO_CONST_ASN_REF_P. Also set flag bits in T based on | |
1196 | properties of the bases. */ | |
8d08fdba | 1197 | |
607cf131 | 1198 | static void |
94edc4ab | 1199 | check_bases (tree t, |
0cbd7506 MS |
1200 | int* cant_have_const_ctor_p, |
1201 | int* no_const_asn_ref_p) | |
8d08fdba | 1202 | { |
607cf131 | 1203 | int i; |
0fb3018c | 1204 | int seen_non_virtual_nearly_empty_base_p; |
fa743e8c NS |
1205 | tree base_binfo; |
1206 | tree binfo; | |
8d08fdba | 1207 | |
0fb3018c | 1208 | seen_non_virtual_nearly_empty_base_p = 0; |
607cf131 | 1209 | |
fa743e8c NS |
1210 | for (binfo = TYPE_BINFO (t), i = 0; |
1211 | BINFO_BASE_ITERATE (binfo, i, base_binfo); i++) | |
8d08fdba | 1212 | { |
fa743e8c | 1213 | tree basetype = TREE_TYPE (base_binfo); |
9a71c18b | 1214 | |
50bc768d | 1215 | gcc_assert (COMPLETE_TYPE_P (basetype)); |
c8094d83 | 1216 | |
4c6b7393 | 1217 | /* Effective C++ rule 14. We only need to check TYPE_POLYMORPHIC_P |
607cf131 MM |
1218 | here because the case of virtual functions but non-virtual |
1219 | dtor is handled in finish_struct_1. */ | |
9f4faeae | 1220 | if (warn_ecpp && ! TYPE_POLYMORPHIC_P (basetype)) |
d4ee4d25 | 1221 | warning (0, "base class %q#T has a non-virtual destructor", basetype); |
8d08fdba | 1222 | |
607cf131 MM |
1223 | /* If the base class doesn't have copy constructors or |
1224 | assignment operators that take const references, then the | |
1225 | derived class cannot have such a member automatically | |
1226 | generated. */ | |
1227 | if (! TYPE_HAS_CONST_INIT_REF (basetype)) | |
1228 | *cant_have_const_ctor_p = 1; | |
1229 | if (TYPE_HAS_ASSIGN_REF (basetype) | |
1230 | && !TYPE_HAS_CONST_ASSIGN_REF (basetype)) | |
1231 | *no_const_asn_ref_p = 1; | |
8d08fdba | 1232 | |
809e3e7f | 1233 | if (BINFO_VIRTUAL_P (base_binfo)) |
00a17e31 | 1234 | /* A virtual base does not effect nearly emptiness. */ |
0fb3018c | 1235 | ; |
f9c528ea | 1236 | else if (CLASSTYPE_NEARLY_EMPTY_P (basetype)) |
0fb3018c NS |
1237 | { |
1238 | if (seen_non_virtual_nearly_empty_base_p) | |
1239 | /* And if there is more than one nearly empty base, then the | |
1240 | derived class is not nearly empty either. */ | |
1241 | CLASSTYPE_NEARLY_EMPTY_P (t) = 0; | |
1242 | else | |
00a17e31 | 1243 | /* Remember we've seen one. */ |
0fb3018c NS |
1244 | seen_non_virtual_nearly_empty_base_p = 1; |
1245 | } | |
1246 | else if (!is_empty_class (basetype)) | |
1247 | /* If the base class is not empty or nearly empty, then this | |
1248 | class cannot be nearly empty. */ | |
1249 | CLASSTYPE_NEARLY_EMPTY_P (t) = 0; | |
f9c528ea | 1250 | |
607cf131 MM |
1251 | /* A lot of properties from the bases also apply to the derived |
1252 | class. */ | |
8d08fdba | 1253 | TYPE_NEEDS_CONSTRUCTING (t) |= TYPE_NEEDS_CONSTRUCTING (basetype); |
c8094d83 | 1254 | TYPE_HAS_NONTRIVIAL_DESTRUCTOR (t) |
834c6dff | 1255 | |= TYPE_HAS_NONTRIVIAL_DESTRUCTOR (basetype); |
c8094d83 | 1256 | TYPE_HAS_COMPLEX_ASSIGN_REF (t) |
607cf131 | 1257 | |= TYPE_HAS_COMPLEX_ASSIGN_REF (basetype); |
e8abc66f | 1258 | TYPE_HAS_COMPLEX_INIT_REF (t) |= TYPE_HAS_COMPLEX_INIT_REF (basetype); |
4c6b7393 | 1259 | TYPE_POLYMORPHIC_P (t) |= TYPE_POLYMORPHIC_P (basetype); |
c8094d83 | 1260 | CLASSTYPE_CONTAINS_EMPTY_CLASS_P (t) |
5ec1192e | 1261 | |= CLASSTYPE_CONTAINS_EMPTY_CLASS_P (basetype); |
607cf131 MM |
1262 | } |
1263 | } | |
1264 | ||
fc6633e0 NS |
1265 | /* Determine all the primary bases within T. Sets BINFO_PRIMARY_BASE_P for |
1266 | those that are primaries. Sets BINFO_LOST_PRIMARY_P for those | |
1267 | that have had a nearly-empty virtual primary base stolen by some | |
77880ae4 | 1268 | other base in the hierarchy. Determines CLASSTYPE_PRIMARY_BASE for |
fc6633e0 | 1269 | T. */ |
c35cce41 MM |
1270 | |
1271 | static void | |
fc6633e0 | 1272 | determine_primary_bases (tree t) |
c35cce41 | 1273 | { |
fc6633e0 NS |
1274 | unsigned i; |
1275 | tree primary = NULL_TREE; | |
1276 | tree type_binfo = TYPE_BINFO (t); | |
1277 | tree base_binfo; | |
1278 | ||
1279 | /* Determine the primary bases of our bases. */ | |
1280 | for (base_binfo = TREE_CHAIN (type_binfo); base_binfo; | |
1281 | base_binfo = TREE_CHAIN (base_binfo)) | |
c35cce41 | 1282 | { |
fc6633e0 | 1283 | tree primary = CLASSTYPE_PRIMARY_BINFO (BINFO_TYPE (base_binfo)); |
c35cce41 | 1284 | |
fc6633e0 NS |
1285 | /* See if we're the non-virtual primary of our inheritance |
1286 | chain. */ | |
1287 | if (!BINFO_VIRTUAL_P (base_binfo)) | |
dbbf88d1 | 1288 | { |
fc6633e0 NS |
1289 | tree parent = BINFO_INHERITANCE_CHAIN (base_binfo); |
1290 | tree parent_primary = CLASSTYPE_PRIMARY_BINFO (BINFO_TYPE (parent)); | |
c8094d83 | 1291 | |
fc6633e0 | 1292 | if (parent_primary |
539ed333 NS |
1293 | && SAME_BINFO_TYPE_P (BINFO_TYPE (base_binfo), |
1294 | BINFO_TYPE (parent_primary))) | |
fc6633e0 NS |
1295 | /* We are the primary binfo. */ |
1296 | BINFO_PRIMARY_P (base_binfo) = 1; | |
1297 | } | |
1298 | /* Determine if we have a virtual primary base, and mark it so. | |
1299 | */ | |
1300 | if (primary && BINFO_VIRTUAL_P (primary)) | |
1301 | { | |
1302 | tree this_primary = copied_binfo (primary, base_binfo); | |
1303 | ||
1304 | if (BINFO_PRIMARY_P (this_primary)) | |
1305 | /* Someone already claimed this base. */ | |
1306 | BINFO_LOST_PRIMARY_P (base_binfo) = 1; | |
1307 | else | |
dbbf88d1 | 1308 | { |
fc6633e0 | 1309 | tree delta; |
c8094d83 | 1310 | |
fc6633e0 NS |
1311 | BINFO_PRIMARY_P (this_primary) = 1; |
1312 | BINFO_INHERITANCE_CHAIN (this_primary) = base_binfo; | |
c8094d83 | 1313 | |
fc6633e0 | 1314 | /* A virtual binfo might have been copied from within |
0cbd7506 MS |
1315 | another hierarchy. As we're about to use it as a |
1316 | primary base, make sure the offsets match. */ | |
fc6633e0 NS |
1317 | delta = size_diffop (convert (ssizetype, |
1318 | BINFO_OFFSET (base_binfo)), | |
1319 | convert (ssizetype, | |
1320 | BINFO_OFFSET (this_primary))); | |
c8094d83 | 1321 | |
fc6633e0 | 1322 | propagate_binfo_offsets (this_primary, delta); |
dbbf88d1 NS |
1323 | } |
1324 | } | |
c35cce41 | 1325 | } |
8026246f | 1326 | |
fc6633e0 | 1327 | /* First look for a dynamic direct non-virtual base. */ |
fa743e8c | 1328 | for (i = 0; BINFO_BASE_ITERATE (type_binfo, i, base_binfo); i++) |
607cf131 | 1329 | { |
607cf131 | 1330 | tree basetype = BINFO_TYPE (base_binfo); |
aff08c18 | 1331 | |
fc6633e0 | 1332 | if (TYPE_CONTAINS_VPTR_P (basetype) && !BINFO_VIRTUAL_P (base_binfo)) |
8d08fdba | 1333 | { |
fc6633e0 NS |
1334 | primary = base_binfo; |
1335 | goto found; | |
911a71a7 MM |
1336 | } |
1337 | } | |
8026246f | 1338 | |
3461fba7 | 1339 | /* A "nearly-empty" virtual base class can be the primary base |
fc6633e0 NS |
1340 | class, if no non-virtual polymorphic base can be found. Look for |
1341 | a nearly-empty virtual dynamic base that is not already a primary | |
77880ae4 | 1342 | base of something in the hierarchy. If there is no such base, |
fc6633e0 NS |
1343 | just pick the first nearly-empty virtual base. */ |
1344 | ||
1345 | for (base_binfo = TREE_CHAIN (type_binfo); base_binfo; | |
1346 | base_binfo = TREE_CHAIN (base_binfo)) | |
1347 | if (BINFO_VIRTUAL_P (base_binfo) | |
1348 | && CLASSTYPE_NEARLY_EMPTY_P (BINFO_TYPE (base_binfo))) | |
1349 | { | |
1350 | if (!BINFO_PRIMARY_P (base_binfo)) | |
1351 | { | |
1352 | /* Found one that is not primary. */ | |
1353 | primary = base_binfo; | |
1354 | goto found; | |
1355 | } | |
1356 | else if (!primary) | |
1357 | /* Remember the first candidate. */ | |
1358 | primary = base_binfo; | |
1359 | } | |
c8094d83 | 1360 | |
fc6633e0 NS |
1361 | found: |
1362 | /* If we've got a primary base, use it. */ | |
1363 | if (primary) | |
7cafdb8b | 1364 | { |
fc6633e0 | 1365 | tree basetype = BINFO_TYPE (primary); |
c8094d83 | 1366 | |
fc6633e0 NS |
1367 | CLASSTYPE_PRIMARY_BINFO (t) = primary; |
1368 | if (BINFO_PRIMARY_P (primary)) | |
1369 | /* We are stealing a primary base. */ | |
1370 | BINFO_LOST_PRIMARY_P (BINFO_INHERITANCE_CHAIN (primary)) = 1; | |
1371 | BINFO_PRIMARY_P (primary) = 1; | |
1372 | if (BINFO_VIRTUAL_P (primary)) | |
7cafdb8b | 1373 | { |
fc6633e0 | 1374 | tree delta; |
7cafdb8b | 1375 | |
fc6633e0 NS |
1376 | BINFO_INHERITANCE_CHAIN (primary) = type_binfo; |
1377 | /* A virtual binfo might have been copied from within | |
0cbd7506 MS |
1378 | another hierarchy. As we're about to use it as a primary |
1379 | base, make sure the offsets match. */ | |
fc6633e0 NS |
1380 | delta = size_diffop (ssize_int (0), |
1381 | convert (ssizetype, BINFO_OFFSET (primary))); | |
c8094d83 | 1382 | |
fc6633e0 | 1383 | propagate_binfo_offsets (primary, delta); |
7cafdb8b | 1384 | } |
c8094d83 | 1385 | |
fc6633e0 | 1386 | primary = TYPE_BINFO (basetype); |
c8094d83 | 1387 | |
fc6633e0 NS |
1388 | TYPE_VFIELD (t) = TYPE_VFIELD (basetype); |
1389 | BINFO_VTABLE (type_binfo) = BINFO_VTABLE (primary); | |
1390 | BINFO_VIRTUALS (type_binfo) = BINFO_VIRTUALS (primary); | |
7cafdb8b | 1391 | } |
8d08fdba | 1392 | } |
8d08fdba | 1393 | \f |
d2c5305b MM |
1394 | /* Set memoizing fields and bits of T (and its variants) for later |
1395 | use. */ | |
e92cc029 | 1396 | |
8d08fdba | 1397 | static void |
94edc4ab | 1398 | finish_struct_bits (tree t) |
8d08fdba | 1399 | { |
090ad434 | 1400 | tree variants; |
c8094d83 | 1401 | |
8d08fdba | 1402 | /* Fix up variants (if any). */ |
090ad434 NS |
1403 | for (variants = TYPE_NEXT_VARIANT (t); |
1404 | variants; | |
1405 | variants = TYPE_NEXT_VARIANT (variants)) | |
8d08fdba MS |
1406 | { |
1407 | /* These fields are in the _TYPE part of the node, not in | |
1408 | the TYPE_LANG_SPECIFIC component, so they are not shared. */ | |
1409 | TYPE_HAS_CONSTRUCTOR (variants) = TYPE_HAS_CONSTRUCTOR (t); | |
8d08fdba | 1410 | TYPE_NEEDS_CONSTRUCTING (variants) = TYPE_NEEDS_CONSTRUCTING (t); |
c8094d83 | 1411 | TYPE_HAS_NONTRIVIAL_DESTRUCTOR (variants) |
834c6dff | 1412 | = TYPE_HAS_NONTRIVIAL_DESTRUCTOR (t); |
8d08fdba | 1413 | |
4c6b7393 | 1414 | TYPE_POLYMORPHIC_P (variants) = TYPE_POLYMORPHIC_P (t); |
c8094d83 | 1415 | |
cad7e87b NS |
1416 | TYPE_BINFO (variants) = TYPE_BINFO (t); |
1417 | ||
8d08fdba | 1418 | /* Copy whatever these are holding today. */ |
eb34af89 RK |
1419 | TYPE_VFIELD (variants) = TYPE_VFIELD (t); |
1420 | TYPE_METHODS (variants) = TYPE_METHODS (t); | |
5566b478 | 1421 | TYPE_FIELDS (variants) = TYPE_FIELDS (t); |
e92cc029 | 1422 | TYPE_SIZE (variants) = TYPE_SIZE (t); |
509087ae | 1423 | TYPE_SIZE_UNIT (variants) = TYPE_SIZE_UNIT (t); |
8d08fdba MS |
1424 | } |
1425 | ||
fa743e8c | 1426 | if (BINFO_N_BASE_BINFOS (TYPE_BINFO (t)) && TYPE_POLYMORPHIC_P (t)) |
16ae29f1 NS |
1427 | /* For a class w/o baseclasses, 'finish_struct' has set |
1428 | CLASSTYPE_PURE_VIRTUALS correctly (by definition). | |
132c7dd3 NS |
1429 | Similarly for a class whose base classes do not have vtables. |
1430 | When neither of these is true, we might have removed abstract | |
1431 | virtuals (by providing a definition), added some (by declaring | |
1432 | new ones), or redeclared ones from a base class. We need to | |
1433 | recalculate what's really an abstract virtual at this point (by | |
1434 | looking in the vtables). */ | |
1435 | get_pure_virtuals (t); | |
c8094d83 | 1436 | |
132c7dd3 NS |
1437 | /* If this type has a copy constructor or a destructor, force its |
1438 | mode to be BLKmode, and force its TREE_ADDRESSABLE bit to be | |
1439 | nonzero. This will cause it to be passed by invisible reference | |
1440 | and prevent it from being returned in a register. */ | |
8b16faa2 | 1441 | if (! TYPE_HAS_TRIVIAL_INIT_REF (t) || TYPE_HAS_NONTRIVIAL_DESTRUCTOR (t)) |
8d08fdba | 1442 | { |
e8abc66f | 1443 | tree variants; |
d2e5ee5c | 1444 | DECL_MODE (TYPE_MAIN_DECL (t)) = BLKmode; |
e8abc66f | 1445 | for (variants = t; variants; variants = TYPE_NEXT_VARIANT (variants)) |
8d08fdba MS |
1446 | { |
1447 | TYPE_MODE (variants) = BLKmode; | |
1448 | TREE_ADDRESSABLE (variants) = 1; | |
8d08fdba MS |
1449 | } |
1450 | } | |
1451 | } | |
1452 | ||
b0e0b31f | 1453 | /* Issue warnings about T having private constructors, but no friends, |
c8094d83 | 1454 | and so forth. |
aed7b2a6 | 1455 | |
b0e0b31f MM |
1456 | HAS_NONPRIVATE_METHOD is nonzero if T has any non-private methods or |
1457 | static members. HAS_NONPRIVATE_STATIC_FN is nonzero if T has any | |
1458 | non-private static member functions. */ | |
1459 | ||
1460 | static void | |
94edc4ab | 1461 | maybe_warn_about_overly_private_class (tree t) |
aed7b2a6 | 1462 | { |
056a3b12 MM |
1463 | int has_member_fn = 0; |
1464 | int has_nonprivate_method = 0; | |
1465 | tree fn; | |
1466 | ||
1467 | if (!warn_ctor_dtor_privacy | |
b0e0b31f MM |
1468 | /* If the class has friends, those entities might create and |
1469 | access instances, so we should not warn. */ | |
056a3b12 MM |
1470 | || (CLASSTYPE_FRIEND_CLASSES (t) |
1471 | || DECL_FRIENDLIST (TYPE_MAIN_DECL (t))) | |
b0e0b31f MM |
1472 | /* We will have warned when the template was declared; there's |
1473 | no need to warn on every instantiation. */ | |
056a3b12 | 1474 | || CLASSTYPE_TEMPLATE_INSTANTIATION (t)) |
c8094d83 | 1475 | /* There's no reason to even consider warning about this |
056a3b12 MM |
1476 | class. */ |
1477 | return; | |
c8094d83 | 1478 | |
056a3b12 MM |
1479 | /* We only issue one warning, if more than one applies, because |
1480 | otherwise, on code like: | |
1481 | ||
1482 | class A { | |
1483 | // Oops - forgot `public:' | |
1484 | A(); | |
1485 | A(const A&); | |
1486 | ~A(); | |
1487 | }; | |
1488 | ||
1489 | we warn several times about essentially the same problem. */ | |
1490 | ||
1491 | /* Check to see if all (non-constructor, non-destructor) member | |
1492 | functions are private. (Since there are no friends or | |
1493 | non-private statics, we can't ever call any of the private member | |
1494 | functions.) */ | |
1495 | for (fn = TYPE_METHODS (t); fn; fn = TREE_CHAIN (fn)) | |
1496 | /* We're not interested in compiler-generated methods; they don't | |
1497 | provide any way to call private members. */ | |
c8094d83 | 1498 | if (!DECL_ARTIFICIAL (fn)) |
056a3b12 MM |
1499 | { |
1500 | if (!TREE_PRIVATE (fn)) | |
b0e0b31f | 1501 | { |
c8094d83 | 1502 | if (DECL_STATIC_FUNCTION_P (fn)) |
056a3b12 MM |
1503 | /* A non-private static member function is just like a |
1504 | friend; it can create and invoke private member | |
1505 | functions, and be accessed without a class | |
1506 | instance. */ | |
1507 | return; | |
c8094d83 | 1508 | |
056a3b12 | 1509 | has_nonprivate_method = 1; |
f576dfc4 | 1510 | /* Keep searching for a static member function. */ |
056a3b12 | 1511 | } |
ce0a5952 | 1512 | else if (!DECL_CONSTRUCTOR_P (fn) && !DECL_DESTRUCTOR_P (fn)) |
056a3b12 | 1513 | has_member_fn = 1; |
c8094d83 | 1514 | } |
aed7b2a6 | 1515 | |
c8094d83 | 1516 | if (!has_nonprivate_method && has_member_fn) |
056a3b12 | 1517 | { |
ce0a5952 MM |
1518 | /* There are no non-private methods, and there's at least one |
1519 | private member function that isn't a constructor or | |
1520 | destructor. (If all the private members are | |
1521 | constructors/destructors we want to use the code below that | |
1522 | issues error messages specifically referring to | |
1523 | constructors/destructors.) */ | |
fa743e8c | 1524 | unsigned i; |
dbbf88d1 | 1525 | tree binfo = TYPE_BINFO (t); |
c8094d83 | 1526 | |
fa743e8c | 1527 | for (i = 0; i != BINFO_N_BASE_BINFOS (binfo); i++) |
604a3205 | 1528 | if (BINFO_BASE_ACCESS (binfo, i) != access_private_node) |
056a3b12 MM |
1529 | { |
1530 | has_nonprivate_method = 1; | |
1531 | break; | |
1532 | } | |
c8094d83 | 1533 | if (!has_nonprivate_method) |
b0e0b31f | 1534 | { |
d4ee4d25 | 1535 | warning (0, "all member functions in class %qT are private", t); |
056a3b12 | 1536 | return; |
b0e0b31f | 1537 | } |
056a3b12 | 1538 | } |
aed7b2a6 | 1539 | |
056a3b12 MM |
1540 | /* Even if some of the member functions are non-private, the class |
1541 | won't be useful for much if all the constructors or destructors | |
1542 | are private: such an object can never be created or destroyed. */ | |
9f4faeae MM |
1543 | fn = CLASSTYPE_DESTRUCTORS (t); |
1544 | if (fn && TREE_PRIVATE (fn)) | |
056a3b12 | 1545 | { |
d4ee4d25 | 1546 | warning (0, "%q#T only defines a private destructor and has no friends", |
4b0d3cbe MM |
1547 | t); |
1548 | return; | |
056a3b12 | 1549 | } |
b0e0b31f | 1550 | |
550d1bf4 MM |
1551 | if (TYPE_HAS_CONSTRUCTOR (t) |
1552 | /* Implicitly generated constructors are always public. */ | |
1553 | && (!CLASSTYPE_LAZY_DEFAULT_CTOR (t) | |
1554 | || !CLASSTYPE_LAZY_COPY_CTOR (t))) | |
056a3b12 MM |
1555 | { |
1556 | int nonprivate_ctor = 0; | |
c8094d83 | 1557 | |
056a3b12 MM |
1558 | /* If a non-template class does not define a copy |
1559 | constructor, one is defined for it, enabling it to avoid | |
1560 | this warning. For a template class, this does not | |
1561 | happen, and so we would normally get a warning on: | |
b0e0b31f | 1562 | |
c8094d83 MS |
1563 | template <class T> class C { private: C(); }; |
1564 | ||
056a3b12 MM |
1565 | To avoid this asymmetry, we check TYPE_HAS_INIT_REF. All |
1566 | complete non-template or fully instantiated classes have this | |
1567 | flag set. */ | |
1568 | if (!TYPE_HAS_INIT_REF (t)) | |
1569 | nonprivate_ctor = 1; | |
c8094d83 MS |
1570 | else |
1571 | for (fn = CLASSTYPE_CONSTRUCTORS (t); fn; fn = OVL_NEXT (fn)) | |
056a3b12 MM |
1572 | { |
1573 | tree ctor = OVL_CURRENT (fn); | |
1574 | /* Ideally, we wouldn't count copy constructors (or, in | |
1575 | fact, any constructor that takes an argument of the | |
1576 | class type as a parameter) because such things cannot | |
1577 | be used to construct an instance of the class unless | |
1578 | you already have one. But, for now at least, we're | |
1579 | more generous. */ | |
1580 | if (! TREE_PRIVATE (ctor)) | |
b0e0b31f | 1581 | { |
056a3b12 MM |
1582 | nonprivate_ctor = 1; |
1583 | break; | |
b0e0b31f | 1584 | } |
056a3b12 | 1585 | } |
aed7b2a6 | 1586 | |
056a3b12 MM |
1587 | if (nonprivate_ctor == 0) |
1588 | { | |
d4ee4d25 | 1589 | warning (0, "%q#T only defines private constructors and has no friends", |
0cbd7506 | 1590 | t); |
056a3b12 | 1591 | return; |
b0e0b31f MM |
1592 | } |
1593 | } | |
aed7b2a6 MM |
1594 | } |
1595 | ||
17211ab5 GK |
1596 | static struct { |
1597 | gt_pointer_operator new_value; | |
1598 | void *cookie; | |
1599 | } resort_data; | |
1600 | ||
f90cdf34 MT |
1601 | /* Comparison function to compare two TYPE_METHOD_VEC entries by name. */ |
1602 | ||
1603 | static int | |
94edc4ab | 1604 | method_name_cmp (const void* m1_p, const void* m2_p) |
f90cdf34 | 1605 | { |
17211ab5 GK |
1606 | const tree *const m1 = m1_p; |
1607 | const tree *const m2 = m2_p; | |
c8094d83 | 1608 | |
f90cdf34 MT |
1609 | if (*m1 == NULL_TREE && *m2 == NULL_TREE) |
1610 | return 0; | |
1611 | if (*m1 == NULL_TREE) | |
1612 | return -1; | |
1613 | if (*m2 == NULL_TREE) | |
1614 | return 1; | |
1615 | if (DECL_NAME (OVL_CURRENT (*m1)) < DECL_NAME (OVL_CURRENT (*m2))) | |
1616 | return -1; | |
1617 | return 1; | |
1618 | } | |
b0e0b31f | 1619 | |
17211ab5 GK |
1620 | /* This routine compares two fields like method_name_cmp but using the |
1621 | pointer operator in resort_field_decl_data. */ | |
1622 | ||
1623 | static int | |
94edc4ab | 1624 | resort_method_name_cmp (const void* m1_p, const void* m2_p) |
17211ab5 GK |
1625 | { |
1626 | const tree *const m1 = m1_p; | |
1627 | const tree *const m2 = m2_p; | |
1628 | if (*m1 == NULL_TREE && *m2 == NULL_TREE) | |
1629 | return 0; | |
1630 | if (*m1 == NULL_TREE) | |
1631 | return -1; | |
1632 | if (*m2 == NULL_TREE) | |
1633 | return 1; | |
1634 | { | |
1635 | tree d1 = DECL_NAME (OVL_CURRENT (*m1)); | |
1636 | tree d2 = DECL_NAME (OVL_CURRENT (*m2)); | |
1637 | resort_data.new_value (&d1, resort_data.cookie); | |
1638 | resort_data.new_value (&d2, resort_data.cookie); | |
1639 | if (d1 < d2) | |
1640 | return -1; | |
1641 | } | |
1642 | return 1; | |
1643 | } | |
1644 | ||
1645 | /* Resort TYPE_METHOD_VEC because pointers have been reordered. */ | |
1646 | ||
c8094d83 | 1647 | void |
94edc4ab | 1648 | resort_type_method_vec (void* obj, |
0cbd7506 MS |
1649 | void* orig_obj ATTRIBUTE_UNUSED , |
1650 | gt_pointer_operator new_value, | |
1651 | void* cookie) | |
17211ab5 | 1652 | { |
d4e6fecb | 1653 | VEC(tree,gc) *method_vec = (VEC(tree,gc) *) obj; |
aaaa46d2 MM |
1654 | int len = VEC_length (tree, method_vec); |
1655 | size_t slot; | |
1656 | tree fn; | |
17211ab5 GK |
1657 | |
1658 | /* The type conversion ops have to live at the front of the vec, so we | |
1659 | can't sort them. */ | |
aaaa46d2 | 1660 | for (slot = CLASSTYPE_FIRST_CONVERSION_SLOT; |
9ba5ff0f | 1661 | VEC_iterate (tree, method_vec, slot, fn); |
aaaa46d2 MM |
1662 | ++slot) |
1663 | if (!DECL_CONV_FN_P (OVL_CURRENT (fn))) | |
1664 | break; | |
1665 | ||
17211ab5 GK |
1666 | if (len - slot > 1) |
1667 | { | |
1668 | resort_data.new_value = new_value; | |
1669 | resort_data.cookie = cookie; | |
aaaa46d2 | 1670 | qsort (VEC_address (tree, method_vec) + slot, len - slot, sizeof (tree), |
17211ab5 GK |
1671 | resort_method_name_cmp); |
1672 | } | |
1673 | } | |
1674 | ||
c7222c02 | 1675 | /* Warn about duplicate methods in fn_fields. |
8d08fdba | 1676 | |
5b0cec3b MM |
1677 | Sort methods that are not special (i.e., constructors, destructors, |
1678 | and type conversion operators) so that we can find them faster in | |
1679 | search. */ | |
8d08fdba | 1680 | |
b0e0b31f | 1681 | static void |
94edc4ab | 1682 | finish_struct_methods (tree t) |
8d08fdba | 1683 | { |
b0e0b31f | 1684 | tree fn_fields; |
d4e6fecb | 1685 | VEC(tree,gc) *method_vec; |
58010b57 MM |
1686 | int slot, len; |
1687 | ||
58010b57 | 1688 | method_vec = CLASSTYPE_METHOD_VEC (t); |
508a1c9c MM |
1689 | if (!method_vec) |
1690 | return; | |
1691 | ||
aaaa46d2 | 1692 | len = VEC_length (tree, method_vec); |
8d08fdba | 1693 | |
c7222c02 | 1694 | /* Clear DECL_IN_AGGR_P for all functions. */ |
c8094d83 | 1695 | for (fn_fields = TYPE_METHODS (t); fn_fields; |
b0e0b31f | 1696 | fn_fields = TREE_CHAIN (fn_fields)) |
5b0cec3b | 1697 | DECL_IN_AGGR_P (fn_fields) = 0; |
8d08fdba | 1698 | |
b0e0b31f MM |
1699 | /* Issue warnings about private constructors and such. If there are |
1700 | no methods, then some public defaults are generated. */ | |
f90cdf34 MT |
1701 | maybe_warn_about_overly_private_class (t); |
1702 | ||
f90cdf34 MT |
1703 | /* The type conversion ops have to live at the front of the vec, so we |
1704 | can't sort them. */ | |
9ba5ff0f NS |
1705 | for (slot = CLASSTYPE_FIRST_CONVERSION_SLOT; |
1706 | VEC_iterate (tree, method_vec, slot, fn_fields); | |
aaaa46d2 MM |
1707 | ++slot) |
1708 | if (!DECL_CONV_FN_P (OVL_CURRENT (fn_fields))) | |
1709 | break; | |
f90cdf34 | 1710 | if (len - slot > 1) |
aaaa46d2 MM |
1711 | qsort (VEC_address (tree, method_vec) + slot, |
1712 | len-slot, sizeof (tree), method_name_cmp); | |
8d08fdba MS |
1713 | } |
1714 | ||
90ecce3e | 1715 | /* Make BINFO's vtable have N entries, including RTTI entries, |
8d7a5379 MM |
1716 | vbase and vcall offsets, etc. Set its type and call the backend |
1717 | to lay it out. */ | |
1a588ad7 MM |
1718 | |
1719 | static void | |
94edc4ab | 1720 | layout_vtable_decl (tree binfo, int n) |
1a588ad7 | 1721 | { |
1a588ad7 | 1722 | tree atype; |
c35cce41 | 1723 | tree vtable; |
1a588ad7 | 1724 | |
c8094d83 | 1725 | atype = build_cplus_array_type (vtable_entry_type, |
442e01b6 | 1726 | build_index_type (size_int (n - 1))); |
1a588ad7 MM |
1727 | layout_type (atype); |
1728 | ||
1729 | /* We may have to grow the vtable. */ | |
c35cce41 MM |
1730 | vtable = get_vtbl_decl_for_binfo (binfo); |
1731 | if (!same_type_p (TREE_TYPE (vtable), atype)) | |
1a588ad7 | 1732 | { |
06ceef4e | 1733 | TREE_TYPE (vtable) = atype; |
c35cce41 | 1734 | DECL_SIZE (vtable) = DECL_SIZE_UNIT (vtable) = NULL_TREE; |
06ceef4e | 1735 | layout_decl (vtable, 0); |
1a588ad7 MM |
1736 | } |
1737 | } | |
1738 | ||
9bab6c90 MM |
1739 | /* True iff FNDECL and BASE_FNDECL (both non-static member functions) |
1740 | have the same signature. */ | |
83f2ccf4 | 1741 | |
e0fff4b3 | 1742 | int |
94edc4ab | 1743 | same_signature_p (tree fndecl, tree base_fndecl) |
83f2ccf4 | 1744 | { |
872f37f9 MM |
1745 | /* One destructor overrides another if they are the same kind of |
1746 | destructor. */ | |
1747 | if (DECL_DESTRUCTOR_P (base_fndecl) && DECL_DESTRUCTOR_P (fndecl) | |
1748 | && special_function_p (base_fndecl) == special_function_p (fndecl)) | |
ca36f057 | 1749 | return 1; |
872f37f9 MM |
1750 | /* But a non-destructor never overrides a destructor, nor vice |
1751 | versa, nor do different kinds of destructors override | |
1752 | one-another. For example, a complete object destructor does not | |
1753 | override a deleting destructor. */ | |
0d9eb3ba | 1754 | if (DECL_DESTRUCTOR_P (base_fndecl) || DECL_DESTRUCTOR_P (fndecl)) |
ca36f057 | 1755 | return 0; |
872f37f9 | 1756 | |
a6c0d772 MM |
1757 | if (DECL_NAME (fndecl) == DECL_NAME (base_fndecl) |
1758 | || (DECL_CONV_FN_P (fndecl) | |
1759 | && DECL_CONV_FN_P (base_fndecl) | |
1760 | && same_type_p (DECL_CONV_FN_TYPE (fndecl), | |
1761 | DECL_CONV_FN_TYPE (base_fndecl)))) | |
83f2ccf4 | 1762 | { |
ca36f057 | 1763 | tree types, base_types; |
ca36f057 MM |
1764 | types = TYPE_ARG_TYPES (TREE_TYPE (fndecl)); |
1765 | base_types = TYPE_ARG_TYPES (TREE_TYPE (base_fndecl)); | |
1766 | if ((TYPE_QUALS (TREE_TYPE (TREE_VALUE (base_types))) | |
1767 | == TYPE_QUALS (TREE_TYPE (TREE_VALUE (types)))) | |
1768 | && compparms (TREE_CHAIN (base_types), TREE_CHAIN (types))) | |
1769 | return 1; | |
83f2ccf4 | 1770 | } |
ca36f057 | 1771 | return 0; |
83f2ccf4 MM |
1772 | } |
1773 | ||
9368208b MM |
1774 | /* Returns TRUE if DERIVED is a binfo containing the binfo BASE as a |
1775 | subobject. */ | |
c8094d83 | 1776 | |
9368208b MM |
1777 | static bool |
1778 | base_derived_from (tree derived, tree base) | |
1779 | { | |
dbbf88d1 NS |
1780 | tree probe; |
1781 | ||
1782 | for (probe = base; probe; probe = BINFO_INHERITANCE_CHAIN (probe)) | |
1783 | { | |
1784 | if (probe == derived) | |
1785 | return true; | |
809e3e7f | 1786 | else if (BINFO_VIRTUAL_P (probe)) |
dbbf88d1 NS |
1787 | /* If we meet a virtual base, we can't follow the inheritance |
1788 | any more. See if the complete type of DERIVED contains | |
1789 | such a virtual base. */ | |
58c42dc2 NS |
1790 | return (binfo_for_vbase (BINFO_TYPE (probe), BINFO_TYPE (derived)) |
1791 | != NULL_TREE); | |
dbbf88d1 NS |
1792 | } |
1793 | return false; | |
9368208b MM |
1794 | } |
1795 | ||
ca36f057 MM |
1796 | typedef struct find_final_overrider_data_s { |
1797 | /* The function for which we are trying to find a final overrider. */ | |
1798 | tree fn; | |
1799 | /* The base class in which the function was declared. */ | |
1800 | tree declaring_base; | |
9368208b | 1801 | /* The candidate overriders. */ |
78b45a24 | 1802 | tree candidates; |
5d5a519f | 1803 | /* Path to most derived. */ |
d4e6fecb | 1804 | VEC(tree,heap) *path; |
ca36f057 | 1805 | } find_final_overrider_data; |
8d7a5379 | 1806 | |
f7a8132a MM |
1807 | /* Add the overrider along the current path to FFOD->CANDIDATES. |
1808 | Returns true if an overrider was found; false otherwise. */ | |
8d7a5379 | 1809 | |
f7a8132a | 1810 | static bool |
c8094d83 | 1811 | dfs_find_final_overrider_1 (tree binfo, |
5d5a519f NS |
1812 | find_final_overrider_data *ffod, |
1813 | unsigned depth) | |
7177d104 | 1814 | { |
741d8ca3 MM |
1815 | tree method; |
1816 | ||
f7a8132a MM |
1817 | /* If BINFO is not the most derived type, try a more derived class. |
1818 | A definition there will overrider a definition here. */ | |
5d5a519f | 1819 | if (depth) |
dbbf88d1 | 1820 | { |
5d5a519f NS |
1821 | depth--; |
1822 | if (dfs_find_final_overrider_1 | |
1823 | (VEC_index (tree, ffod->path, depth), ffod, depth)) | |
f7a8132a MM |
1824 | return true; |
1825 | } | |
dbbf88d1 | 1826 | |
741d8ca3 | 1827 | method = look_for_overrides_here (BINFO_TYPE (binfo), ffod->fn); |
f7a8132a MM |
1828 | if (method) |
1829 | { | |
1830 | tree *candidate = &ffod->candidates; | |
c8094d83 | 1831 | |
f7a8132a MM |
1832 | /* Remove any candidates overridden by this new function. */ |
1833 | while (*candidate) | |
8d7a5379 | 1834 | { |
f7a8132a MM |
1835 | /* If *CANDIDATE overrides METHOD, then METHOD |
1836 | cannot override anything else on the list. */ | |
1837 | if (base_derived_from (TREE_VALUE (*candidate), binfo)) | |
1838 | return true; | |
1839 | /* If METHOD overrides *CANDIDATE, remove *CANDIDATE. */ | |
1840 | if (base_derived_from (binfo, TREE_VALUE (*candidate))) | |
1841 | *candidate = TREE_CHAIN (*candidate); | |
dbbf88d1 | 1842 | else |
f7a8132a | 1843 | candidate = &TREE_CHAIN (*candidate); |
5e19c053 | 1844 | } |
c8094d83 | 1845 | |
f7a8132a MM |
1846 | /* Add the new function. */ |
1847 | ffod->candidates = tree_cons (method, binfo, ffod->candidates); | |
1848 | return true; | |
dbbf88d1 | 1849 | } |
5e19c053 | 1850 | |
f7a8132a MM |
1851 | return false; |
1852 | } | |
1853 | ||
1854 | /* Called from find_final_overrider via dfs_walk. */ | |
1855 | ||
1856 | static tree | |
5d5a519f | 1857 | dfs_find_final_overrider_pre (tree binfo, void *data) |
f7a8132a MM |
1858 | { |
1859 | find_final_overrider_data *ffod = (find_final_overrider_data *) data; | |
1860 | ||
1861 | if (binfo == ffod->declaring_base) | |
5d5a519f | 1862 | dfs_find_final_overrider_1 (binfo, ffod, VEC_length (tree, ffod->path)); |
d4e6fecb | 1863 | VEC_safe_push (tree, heap, ffod->path, binfo); |
f7a8132a | 1864 | |
dbbf88d1 NS |
1865 | return NULL_TREE; |
1866 | } | |
db3d8cde | 1867 | |
dbbf88d1 | 1868 | static tree |
5d5a519f | 1869 | dfs_find_final_overrider_post (tree binfo ATTRIBUTE_UNUSED, void *data) |
dbbf88d1 | 1870 | { |
dbbf88d1 | 1871 | find_final_overrider_data *ffod = (find_final_overrider_data *) data; |
5d5a519f | 1872 | VEC_pop (tree, ffod->path); |
78b45a24 | 1873 | |
dd42e135 MM |
1874 | return NULL_TREE; |
1875 | } | |
1876 | ||
5e19c053 MM |
1877 | /* Returns a TREE_LIST whose TREE_PURPOSE is the final overrider for |
1878 | FN and whose TREE_VALUE is the binfo for the base where the | |
95675950 MM |
1879 | overriding occurs. BINFO (in the hierarchy dominated by the binfo |
1880 | DERIVED) is the base object in which FN is declared. */ | |
e92cc029 | 1881 | |
a292b002 | 1882 | static tree |
94edc4ab | 1883 | find_final_overrider (tree derived, tree binfo, tree fn) |
a292b002 | 1884 | { |
5e19c053 | 1885 | find_final_overrider_data ffod; |
a292b002 | 1886 | |
0e339752 | 1887 | /* Getting this right is a little tricky. This is valid: |
a292b002 | 1888 | |
5e19c053 MM |
1889 | struct S { virtual void f (); }; |
1890 | struct T { virtual void f (); }; | |
1891 | struct U : public S, public T { }; | |
a292b002 | 1892 | |
c8094d83 | 1893 | even though calling `f' in `U' is ambiguous. But, |
a292b002 | 1894 | |
5e19c053 MM |
1895 | struct R { virtual void f(); }; |
1896 | struct S : virtual public R { virtual void f (); }; | |
1897 | struct T : virtual public R { virtual void f (); }; | |
1898 | struct U : public S, public T { }; | |
dd42e135 | 1899 | |
d0cd8b44 | 1900 | is not -- there's no way to decide whether to put `S::f' or |
c8094d83 MS |
1901 | `T::f' in the vtable for `R'. |
1902 | ||
5e19c053 MM |
1903 | The solution is to look at all paths to BINFO. If we find |
1904 | different overriders along any two, then there is a problem. */ | |
07fa4878 NS |
1905 | if (DECL_THUNK_P (fn)) |
1906 | fn = THUNK_TARGET (fn); | |
f7a8132a MM |
1907 | |
1908 | /* Determine the depth of the hierarchy. */ | |
5e19c053 MM |
1909 | ffod.fn = fn; |
1910 | ffod.declaring_base = binfo; | |
78b45a24 | 1911 | ffod.candidates = NULL_TREE; |
d4e6fecb | 1912 | ffod.path = VEC_alloc (tree, heap, 30); |
5e19c053 | 1913 | |
5d5a519f NS |
1914 | dfs_walk_all (derived, dfs_find_final_overrider_pre, |
1915 | dfs_find_final_overrider_post, &ffod); | |
f7a8132a | 1916 | |
d4e6fecb | 1917 | VEC_free (tree, heap, ffod.path); |
c8094d83 | 1918 | |
78b45a24 | 1919 | /* If there was no winner, issue an error message. */ |
9368208b | 1920 | if (!ffod.candidates || TREE_CHAIN (ffod.candidates)) |
16a1369e | 1921 | return error_mark_node; |
dd42e135 | 1922 | |
9368208b | 1923 | return ffod.candidates; |
a292b002 MS |
1924 | } |
1925 | ||
548502d3 MM |
1926 | /* Return the index of the vcall offset for FN when TYPE is used as a |
1927 | virtual base. */ | |
d0cd8b44 | 1928 | |
d0cd8b44 | 1929 | static tree |
548502d3 | 1930 | get_vcall_index (tree fn, tree type) |
d0cd8b44 | 1931 | { |
d4e6fecb | 1932 | VEC(tree_pair_s,gc) *indices = CLASSTYPE_VCALL_INDICES (type); |
0871761b NS |
1933 | tree_pair_p p; |
1934 | unsigned ix; | |
d0cd8b44 | 1935 | |
0871761b NS |
1936 | for (ix = 0; VEC_iterate (tree_pair_s, indices, ix, p); ix++) |
1937 | if ((DECL_DESTRUCTOR_P (fn) && DECL_DESTRUCTOR_P (p->purpose)) | |
1938 | || same_signature_p (fn, p->purpose)) | |
1939 | return p->value; | |
548502d3 MM |
1940 | |
1941 | /* There should always be an appropriate index. */ | |
8dc2b103 | 1942 | gcc_unreachable (); |
d0cd8b44 | 1943 | } |
d0cd8b44 JM |
1944 | |
1945 | /* Update an entry in the vtable for BINFO, which is in the hierarchy | |
4639c5c6 | 1946 | dominated by T. FN has been overridden in BINFO; VIRTUALS points to the |
d0cd8b44 | 1947 | corresponding position in the BINFO_VIRTUALS list. */ |
4e7512c9 MM |
1948 | |
1949 | static void | |
a2ddc397 NS |
1950 | update_vtable_entry_for_fn (tree t, tree binfo, tree fn, tree* virtuals, |
1951 | unsigned ix) | |
4e7512c9 MM |
1952 | { |
1953 | tree b; | |
1954 | tree overrider; | |
4e7512c9 | 1955 | tree delta; |
31f8e4f3 | 1956 | tree virtual_base; |
d0cd8b44 | 1957 | tree first_defn; |
3cfabe60 NS |
1958 | tree overrider_fn, overrider_target; |
1959 | tree target_fn = DECL_THUNK_P (fn) ? THUNK_TARGET (fn) : fn; | |
1960 | tree over_return, base_return; | |
f11ee281 | 1961 | bool lost = false; |
4e7512c9 | 1962 | |
d0cd8b44 JM |
1963 | /* Find the nearest primary base (possibly binfo itself) which defines |
1964 | this function; this is the class the caller will convert to when | |
1965 | calling FN through BINFO. */ | |
1966 | for (b = binfo; ; b = get_primary_binfo (b)) | |
4e7512c9 | 1967 | { |
50bc768d | 1968 | gcc_assert (b); |
3cfabe60 | 1969 | if (look_for_overrides_here (BINFO_TYPE (b), target_fn)) |
31f8e4f3 | 1970 | break; |
f11ee281 JM |
1971 | |
1972 | /* The nearest definition is from a lost primary. */ | |
1973 | if (BINFO_LOST_PRIMARY_P (b)) | |
1974 | lost = true; | |
4e7512c9 | 1975 | } |
d0cd8b44 | 1976 | first_defn = b; |
4e7512c9 | 1977 | |
31f8e4f3 | 1978 | /* Find the final overrider. */ |
3cfabe60 | 1979 | overrider = find_final_overrider (TYPE_BINFO (t), b, target_fn); |
4e7512c9 | 1980 | if (overrider == error_mark_node) |
16a1369e JJ |
1981 | { |
1982 | error ("no unique final overrider for %qD in %qT", target_fn, t); | |
1983 | return; | |
1984 | } | |
3cfabe60 | 1985 | overrider_target = overrider_fn = TREE_PURPOSE (overrider); |
c8094d83 | 1986 | |
9bcb9aae | 1987 | /* Check for adjusting covariant return types. */ |
3cfabe60 NS |
1988 | over_return = TREE_TYPE (TREE_TYPE (overrider_target)); |
1989 | base_return = TREE_TYPE (TREE_TYPE (target_fn)); | |
c8094d83 | 1990 | |
3cfabe60 NS |
1991 | if (POINTER_TYPE_P (over_return) |
1992 | && TREE_CODE (over_return) == TREE_CODE (base_return) | |
1993 | && CLASS_TYPE_P (TREE_TYPE (over_return)) | |
b77fe7b4 NS |
1994 | && CLASS_TYPE_P (TREE_TYPE (base_return)) |
1995 | /* If the overrider is invalid, don't even try. */ | |
1996 | && !DECL_INVALID_OVERRIDER_P (overrider_target)) | |
3cfabe60 NS |
1997 | { |
1998 | /* If FN is a covariant thunk, we must figure out the adjustment | |
0cbd7506 MS |
1999 | to the final base FN was converting to. As OVERRIDER_TARGET might |
2000 | also be converting to the return type of FN, we have to | |
2001 | combine the two conversions here. */ | |
3cfabe60 | 2002 | tree fixed_offset, virtual_offset; |
12a669d1 NS |
2003 | |
2004 | over_return = TREE_TYPE (over_return); | |
2005 | base_return = TREE_TYPE (base_return); | |
c8094d83 | 2006 | |
3cfabe60 NS |
2007 | if (DECL_THUNK_P (fn)) |
2008 | { | |
50bc768d | 2009 | gcc_assert (DECL_RESULT_THUNK_P (fn)); |
3cfabe60 NS |
2010 | fixed_offset = ssize_int (THUNK_FIXED_OFFSET (fn)); |
2011 | virtual_offset = THUNK_VIRTUAL_OFFSET (fn); | |
3cfabe60 NS |
2012 | } |
2013 | else | |
2014 | fixed_offset = virtual_offset = NULL_TREE; | |
4977bab6 | 2015 | |
e00853fd NS |
2016 | if (virtual_offset) |
2017 | /* Find the equivalent binfo within the return type of the | |
2018 | overriding function. We will want the vbase offset from | |
2019 | there. */ | |
58c42dc2 | 2020 | virtual_offset = binfo_for_vbase (BINFO_TYPE (virtual_offset), |
12a669d1 NS |
2021 | over_return); |
2022 | else if (!same_type_ignoring_top_level_qualifiers_p | |
2023 | (over_return, base_return)) | |
3cfabe60 NS |
2024 | { |
2025 | /* There was no existing virtual thunk (which takes | |
12a669d1 NS |
2026 | precedence). So find the binfo of the base function's |
2027 | return type within the overriding function's return type. | |
2028 | We cannot call lookup base here, because we're inside a | |
2029 | dfs_walk, and will therefore clobber the BINFO_MARKED | |
2030 | flags. Fortunately we know the covariancy is valid (it | |
2031 | has already been checked), so we can just iterate along | |
2032 | the binfos, which have been chained in inheritance graph | |
2033 | order. Of course it is lame that we have to repeat the | |
2034 | search here anyway -- we should really be caching pieces | |
2035 | of the vtable and avoiding this repeated work. */ | |
2036 | tree thunk_binfo, base_binfo; | |
2037 | ||
2038 | /* Find the base binfo within the overriding function's | |
742f25b3 NS |
2039 | return type. We will always find a thunk_binfo, except |
2040 | when the covariancy is invalid (which we will have | |
2041 | already diagnosed). */ | |
12a669d1 NS |
2042 | for (base_binfo = TYPE_BINFO (base_return), |
2043 | thunk_binfo = TYPE_BINFO (over_return); | |
742f25b3 | 2044 | thunk_binfo; |
12a669d1 | 2045 | thunk_binfo = TREE_CHAIN (thunk_binfo)) |
742f25b3 NS |
2046 | if (SAME_BINFO_TYPE_P (BINFO_TYPE (thunk_binfo), |
2047 | BINFO_TYPE (base_binfo))) | |
2048 | break; | |
c8094d83 | 2049 | |
12a669d1 NS |
2050 | /* See if virtual inheritance is involved. */ |
2051 | for (virtual_offset = thunk_binfo; | |
2052 | virtual_offset; | |
2053 | virtual_offset = BINFO_INHERITANCE_CHAIN (virtual_offset)) | |
2054 | if (BINFO_VIRTUAL_P (virtual_offset)) | |
2055 | break; | |
c8094d83 | 2056 | |
742f25b3 NS |
2057 | if (virtual_offset |
2058 | || (thunk_binfo && !BINFO_OFFSET_ZEROP (thunk_binfo))) | |
3cfabe60 | 2059 | { |
bb885938 | 2060 | tree offset = convert (ssizetype, BINFO_OFFSET (thunk_binfo)); |
8d1f0f67 | 2061 | |
12a669d1 | 2062 | if (virtual_offset) |
3cfabe60 | 2063 | { |
12a669d1 NS |
2064 | /* We convert via virtual base. Adjust the fixed |
2065 | offset to be from there. */ | |
bb885938 NS |
2066 | offset = size_diffop |
2067 | (offset, convert | |
2068 | (ssizetype, BINFO_OFFSET (virtual_offset))); | |
3cfabe60 NS |
2069 | } |
2070 | if (fixed_offset) | |
2071 | /* There was an existing fixed offset, this must be | |
2072 | from the base just converted to, and the base the | |
2073 | FN was thunking to. */ | |
2074 | fixed_offset = size_binop (PLUS_EXPR, fixed_offset, offset); | |
2075 | else | |
2076 | fixed_offset = offset; | |
2077 | } | |
2078 | } | |
c8094d83 | 2079 | |
3cfabe60 NS |
2080 | if (fixed_offset || virtual_offset) |
2081 | /* Replace the overriding function with a covariant thunk. We | |
2082 | will emit the overriding function in its own slot as | |
9bcb9aae | 2083 | well. */ |
3cfabe60 NS |
2084 | overrider_fn = make_thunk (overrider_target, /*this_adjusting=*/0, |
2085 | fixed_offset, virtual_offset); | |
2086 | } | |
2087 | else | |
50bc768d | 2088 | gcc_assert (!DECL_THUNK_P (fn)); |
c8094d83 | 2089 | |
31f8e4f3 MM |
2090 | /* Assume that we will produce a thunk that convert all the way to |
2091 | the final overrider, and not to an intermediate virtual base. */ | |
9ccf6541 | 2092 | virtual_base = NULL_TREE; |
31f8e4f3 | 2093 | |
f11ee281 | 2094 | /* See if we can convert to an intermediate virtual base first, and then |
3461fba7 | 2095 | use the vcall offset located there to finish the conversion. */ |
f11ee281 | 2096 | for (; b; b = BINFO_INHERITANCE_CHAIN (b)) |
4e7512c9 | 2097 | { |
d0cd8b44 JM |
2098 | /* If we find the final overrider, then we can stop |
2099 | walking. */ | |
539ed333 NS |
2100 | if (SAME_BINFO_TYPE_P (BINFO_TYPE (b), |
2101 | BINFO_TYPE (TREE_VALUE (overrider)))) | |
1f84ec23 | 2102 | break; |
31f8e4f3 | 2103 | |
d0cd8b44 JM |
2104 | /* If we find a virtual base, and we haven't yet found the |
2105 | overrider, then there is a virtual base between the | |
2106 | declaring base (first_defn) and the final overrider. */ | |
809e3e7f | 2107 | if (BINFO_VIRTUAL_P (b)) |
dbbf88d1 NS |
2108 | { |
2109 | virtual_base = b; | |
2110 | break; | |
2111 | } | |
4e7512c9 | 2112 | } |
4e7512c9 | 2113 | |
a2ddc397 NS |
2114 | if (overrider_fn != overrider_target && !virtual_base) |
2115 | { | |
2116 | /* The ABI specifies that a covariant thunk includes a mangling | |
0cbd7506 MS |
2117 | for a this pointer adjustment. This-adjusting thunks that |
2118 | override a function from a virtual base have a vcall | |
2119 | adjustment. When the virtual base in question is a primary | |
2120 | virtual base, we know the adjustments are zero, (and in the | |
2121 | non-covariant case, we would not use the thunk). | |
2122 | Unfortunately we didn't notice this could happen, when | |
2123 | designing the ABI and so never mandated that such a covariant | |
2124 | thunk should be emitted. Because we must use the ABI mandated | |
2125 | name, we must continue searching from the binfo where we | |
2126 | found the most recent definition of the function, towards the | |
2127 | primary binfo which first introduced the function into the | |
2128 | vtable. If that enters a virtual base, we must use a vcall | |
2129 | this-adjusting thunk. Bleah! */ | |
bb885938 NS |
2130 | tree probe = first_defn; |
2131 | ||
2132 | while ((probe = get_primary_binfo (probe)) | |
2133 | && (unsigned) list_length (BINFO_VIRTUALS (probe)) > ix) | |
809e3e7f | 2134 | if (BINFO_VIRTUAL_P (probe)) |
bb885938 | 2135 | virtual_base = probe; |
c8094d83 | 2136 | |
a2ddc397 NS |
2137 | if (virtual_base) |
2138 | /* Even if we find a virtual base, the correct delta is | |
2139 | between the overrider and the binfo we're building a vtable | |
2140 | for. */ | |
2141 | goto virtual_covariant; | |
2142 | } | |
c8094d83 | 2143 | |
d0cd8b44 JM |
2144 | /* Compute the constant adjustment to the `this' pointer. The |
2145 | `this' pointer, when this function is called, will point at BINFO | |
2146 | (or one of its primary bases, which are at the same offset). */ | |
31f8e4f3 | 2147 | if (virtual_base) |
20dde49d NS |
2148 | /* The `this' pointer needs to be adjusted from the declaration to |
2149 | the nearest virtual base. */ | |
bb885938 NS |
2150 | delta = size_diffop (convert (ssizetype, BINFO_OFFSET (virtual_base)), |
2151 | convert (ssizetype, BINFO_OFFSET (first_defn))); | |
f11ee281 JM |
2152 | else if (lost) |
2153 | /* If the nearest definition is in a lost primary, we don't need an | |
2154 | entry in our vtable. Except possibly in a constructor vtable, | |
2155 | if we happen to get our primary back. In that case, the offset | |
2156 | will be zero, as it will be a primary base. */ | |
2157 | delta = size_zero_node; | |
4e7512c9 | 2158 | else |
548502d3 MM |
2159 | /* The `this' pointer needs to be adjusted from pointing to |
2160 | BINFO to pointing at the base where the final overrider | |
2161 | appears. */ | |
a2ddc397 | 2162 | virtual_covariant: |
bb885938 NS |
2163 | delta = size_diffop (convert (ssizetype, |
2164 | BINFO_OFFSET (TREE_VALUE (overrider))), | |
2165 | convert (ssizetype, BINFO_OFFSET (binfo))); | |
4e7512c9 | 2166 | |
3cfabe60 | 2167 | modify_vtable_entry (t, binfo, overrider_fn, delta, virtuals); |
31f8e4f3 MM |
2168 | |
2169 | if (virtual_base) | |
c8094d83 | 2170 | BV_VCALL_INDEX (*virtuals) |
3cfabe60 | 2171 | = get_vcall_index (overrider_target, BINFO_TYPE (virtual_base)); |
d1f05f93 NS |
2172 | else |
2173 | BV_VCALL_INDEX (*virtuals) = NULL_TREE; | |
4e7512c9 MM |
2174 | } |
2175 | ||
8026246f | 2176 | /* Called from modify_all_vtables via dfs_walk. */ |
e92cc029 | 2177 | |
8026246f | 2178 | static tree |
94edc4ab | 2179 | dfs_modify_vtables (tree binfo, void* data) |
8026246f | 2180 | { |
bcb1079e | 2181 | tree t = (tree) data; |
5b94d9dd NS |
2182 | tree virtuals; |
2183 | tree old_virtuals; | |
2184 | unsigned ix; | |
2185 | ||
2186 | if (!TYPE_CONTAINS_VPTR_P (BINFO_TYPE (binfo))) | |
2187 | /* A base without a vtable needs no modification, and its bases | |
2188 | are uninteresting. */ | |
2189 | return dfs_skip_bases; | |
c8094d83 | 2190 | |
5b94d9dd NS |
2191 | if (SAME_BINFO_TYPE_P (BINFO_TYPE (binfo), t) |
2192 | && !CLASSTYPE_HAS_PRIMARY_BASE_P (t)) | |
2193 | /* Don't do the primary vtable, if it's new. */ | |
2194 | return NULL_TREE; | |
2195 | ||
2196 | if (BINFO_PRIMARY_P (binfo) && !BINFO_VIRTUAL_P (binfo)) | |
2197 | /* There's no need to modify the vtable for a non-virtual primary | |
2198 | base; we're not going to use that vtable anyhow. We do still | |
2199 | need to do this for virtual primary bases, as they could become | |
2200 | non-primary in a construction vtable. */ | |
2201 | return NULL_TREE; | |
2202 | ||
2203 | make_new_vtable (t, binfo); | |
c8094d83 | 2204 | |
5b94d9dd NS |
2205 | /* Now, go through each of the virtual functions in the virtual |
2206 | function table for BINFO. Find the final overrider, and update | |
2207 | the BINFO_VIRTUALS list appropriately. */ | |
2208 | for (ix = 0, virtuals = BINFO_VIRTUALS (binfo), | |
2209 | old_virtuals = BINFO_VIRTUALS (TYPE_BINFO (BINFO_TYPE (binfo))); | |
2210 | virtuals; | |
2211 | ix++, virtuals = TREE_CHAIN (virtuals), | |
2212 | old_virtuals = TREE_CHAIN (old_virtuals)) | |
c8094d83 MS |
2213 | update_vtable_entry_for_fn (t, |
2214 | binfo, | |
5b94d9dd NS |
2215 | BV_FN (old_virtuals), |
2216 | &virtuals, ix); | |
8026246f | 2217 | |
8026246f MM |
2218 | return NULL_TREE; |
2219 | } | |
2220 | ||
a68ad5bd MM |
2221 | /* Update all of the primary and secondary vtables for T. Create new |
2222 | vtables as required, and initialize their RTTI information. Each | |
e6858a84 NS |
2223 | of the functions in VIRTUALS is declared in T and may override a |
2224 | virtual function from a base class; find and modify the appropriate | |
2225 | entries to point to the overriding functions. Returns a list, in | |
2226 | declaration order, of the virtual functions that are declared in T, | |
2227 | but do not appear in the primary base class vtable, and which | |
2228 | should therefore be appended to the end of the vtable for T. */ | |
a68ad5bd MM |
2229 | |
2230 | static tree | |
94edc4ab | 2231 | modify_all_vtables (tree t, tree virtuals) |
8026246f | 2232 | { |
3461fba7 NS |
2233 | tree binfo = TYPE_BINFO (t); |
2234 | tree *fnsp; | |
a68ad5bd | 2235 | |
5e19c053 | 2236 | /* Update all of the vtables. */ |
5b94d9dd | 2237 | dfs_walk_once (binfo, dfs_modify_vtables, NULL, t); |
a68ad5bd | 2238 | |
e6858a84 NS |
2239 | /* Add virtual functions not already in our primary vtable. These |
2240 | will be both those introduced by this class, and those overridden | |
2241 | from secondary bases. It does not include virtuals merely | |
2242 | inherited from secondary bases. */ | |
2243 | for (fnsp = &virtuals; *fnsp; ) | |
a68ad5bd | 2244 | { |
3461fba7 | 2245 | tree fn = TREE_VALUE (*fnsp); |
a68ad5bd | 2246 | |
e6858a84 NS |
2247 | if (!value_member (fn, BINFO_VIRTUALS (binfo)) |
2248 | || DECL_VINDEX (fn) == error_mark_node) | |
a68ad5bd | 2249 | { |
3461fba7 NS |
2250 | /* We don't need to adjust the `this' pointer when |
2251 | calling this function. */ | |
2252 | BV_DELTA (*fnsp) = integer_zero_node; | |
2253 | BV_VCALL_INDEX (*fnsp) = NULL_TREE; | |
2254 | ||
e6858a84 | 2255 | /* This is a function not already in our vtable. Keep it. */ |
3461fba7 | 2256 | fnsp = &TREE_CHAIN (*fnsp); |
a68ad5bd | 2257 | } |
3461fba7 NS |
2258 | else |
2259 | /* We've already got an entry for this function. Skip it. */ | |
2260 | *fnsp = TREE_CHAIN (*fnsp); | |
a68ad5bd | 2261 | } |
e93ee644 | 2262 | |
e6858a84 | 2263 | return virtuals; |
7177d104 MS |
2264 | } |
2265 | ||
7d5b8b11 MM |
2266 | /* Get the base virtual function declarations in T that have the |
2267 | indicated NAME. */ | |
e92cc029 | 2268 | |
5ddc28a5 | 2269 | static tree |
94edc4ab | 2270 | get_basefndecls (tree name, tree t) |
9e9ff709 | 2271 | { |
7d5b8b11 | 2272 | tree methods; |
9e9ff709 | 2273 | tree base_fndecls = NULL_TREE; |
604a3205 | 2274 | int n_baseclasses = BINFO_N_BASE_BINFOS (TYPE_BINFO (t)); |
7d5b8b11 | 2275 | int i; |
9e9ff709 | 2276 | |
3d1df1fa MM |
2277 | /* Find virtual functions in T with the indicated NAME. */ |
2278 | i = lookup_fnfields_1 (t, name); | |
2279 | if (i != -1) | |
aaaa46d2 | 2280 | for (methods = VEC_index (tree, CLASSTYPE_METHOD_VEC (t), i); |
3d1df1fa MM |
2281 | methods; |
2282 | methods = OVL_NEXT (methods)) | |
2283 | { | |
2284 | tree method = OVL_CURRENT (methods); | |
2285 | ||
2286 | if (TREE_CODE (method) == FUNCTION_DECL | |
2287 | && DECL_VINDEX (method)) | |
2288 | base_fndecls = tree_cons (NULL_TREE, method, base_fndecls); | |
2289 | } | |
9e9ff709 MS |
2290 | |
2291 | if (base_fndecls) | |
2292 | return base_fndecls; | |
2293 | ||
2294 | for (i = 0; i < n_baseclasses; i++) | |
2295 | { | |
604a3205 | 2296 | tree basetype = BINFO_TYPE (BINFO_BASE_BINFO (TYPE_BINFO (t), i)); |
7d5b8b11 | 2297 | base_fndecls = chainon (get_basefndecls (name, basetype), |
9e9ff709 MS |
2298 | base_fndecls); |
2299 | } | |
2300 | ||
2301 | return base_fndecls; | |
2302 | } | |
2303 | ||
2ee887f2 MS |
2304 | /* If this declaration supersedes the declaration of |
2305 | a method declared virtual in the base class, then | |
2306 | mark this field as being virtual as well. */ | |
2307 | ||
9f4faeae | 2308 | void |
94edc4ab | 2309 | check_for_override (tree decl, tree ctype) |
2ee887f2 | 2310 | { |
cbb40945 NS |
2311 | if (TREE_CODE (decl) == TEMPLATE_DECL) |
2312 | /* In [temp.mem] we have: | |
2ee887f2 | 2313 | |
0cbd7506 MS |
2314 | A specialization of a member function template does not |
2315 | override a virtual function from a base class. */ | |
cbb40945 NS |
2316 | return; |
2317 | if ((DECL_DESTRUCTOR_P (decl) | |
a6c0d772 MM |
2318 | || IDENTIFIER_VIRTUAL_P (DECL_NAME (decl)) |
2319 | || DECL_CONV_FN_P (decl)) | |
cbb40945 NS |
2320 | && look_for_overrides (ctype, decl) |
2321 | && !DECL_STATIC_FUNCTION_P (decl)) | |
e6858a84 NS |
2322 | /* Set DECL_VINDEX to a value that is neither an INTEGER_CST nor |
2323 | the error_mark_node so that we know it is an overriding | |
2324 | function. */ | |
2325 | DECL_VINDEX (decl) = decl; | |
2326 | ||
cbb40945 | 2327 | if (DECL_VIRTUAL_P (decl)) |
2ee887f2 | 2328 | { |
e6858a84 | 2329 | if (!DECL_VINDEX (decl)) |
2ee887f2 MS |
2330 | DECL_VINDEX (decl) = error_mark_node; |
2331 | IDENTIFIER_VIRTUAL_P (DECL_NAME (decl)) = 1; | |
2332 | } | |
2333 | } | |
2334 | ||
fc378698 MS |
2335 | /* Warn about hidden virtual functions that are not overridden in t. |
2336 | We know that constructors and destructors don't apply. */ | |
e92cc029 | 2337 | |
9e9ff709 | 2338 | void |
94edc4ab | 2339 | warn_hidden (tree t) |
9e9ff709 | 2340 | { |
d4e6fecb | 2341 | VEC(tree,gc) *method_vec = CLASSTYPE_METHOD_VEC (t); |
aaaa46d2 MM |
2342 | tree fns; |
2343 | size_t i; | |
9e9ff709 MS |
2344 | |
2345 | /* We go through each separately named virtual function. */ | |
c8094d83 | 2346 | for (i = CLASSTYPE_FIRST_CONVERSION_SLOT; |
9ba5ff0f | 2347 | VEC_iterate (tree, method_vec, i, fns); |
aaaa46d2 | 2348 | ++i) |
9e9ff709 | 2349 | { |
aaaa46d2 | 2350 | tree fn; |
7d5b8b11 MM |
2351 | tree name; |
2352 | tree fndecl; | |
2353 | tree base_fndecls; | |
fa743e8c NS |
2354 | tree base_binfo; |
2355 | tree binfo; | |
7d5b8b11 MM |
2356 | int j; |
2357 | ||
2358 | /* All functions in this slot in the CLASSTYPE_METHOD_VEC will | |
2359 | have the same name. Figure out what name that is. */ | |
aaaa46d2 | 2360 | name = DECL_NAME (OVL_CURRENT (fns)); |
7d5b8b11 MM |
2361 | /* There are no possibly hidden functions yet. */ |
2362 | base_fndecls = NULL_TREE; | |
2363 | /* Iterate through all of the base classes looking for possibly | |
2364 | hidden functions. */ | |
fa743e8c NS |
2365 | for (binfo = TYPE_BINFO (t), j = 0; |
2366 | BINFO_BASE_ITERATE (binfo, j, base_binfo); j++) | |
a4832853 | 2367 | { |
fa743e8c | 2368 | tree basetype = BINFO_TYPE (base_binfo); |
7d5b8b11 MM |
2369 | base_fndecls = chainon (get_basefndecls (name, basetype), |
2370 | base_fndecls); | |
a4832853 JM |
2371 | } |
2372 | ||
00a17e31 | 2373 | /* If there are no functions to hide, continue. */ |
7d5b8b11 | 2374 | if (!base_fndecls) |
9e9ff709 MS |
2375 | continue; |
2376 | ||
00a17e31 | 2377 | /* Remove any overridden functions. */ |
aaaa46d2 | 2378 | for (fn = fns; fn; fn = OVL_NEXT (fn)) |
9e9ff709 | 2379 | { |
aaaa46d2 | 2380 | fndecl = OVL_CURRENT (fn); |
7d5b8b11 MM |
2381 | if (DECL_VINDEX (fndecl)) |
2382 | { | |
2383 | tree *prev = &base_fndecls; | |
c8094d83 MS |
2384 | |
2385 | while (*prev) | |
7d5b8b11 MM |
2386 | /* If the method from the base class has the same |
2387 | signature as the method from the derived class, it | |
2388 | has been overridden. */ | |
2389 | if (same_signature_p (fndecl, TREE_VALUE (*prev))) | |
2390 | *prev = TREE_CHAIN (*prev); | |
2391 | else | |
2392 | prev = &TREE_CHAIN (*prev); | |
2393 | } | |
9e9ff709 MS |
2394 | } |
2395 | ||
9e9ff709 MS |
2396 | /* Now give a warning for all base functions without overriders, |
2397 | as they are hidden. */ | |
c8094d83 | 2398 | while (base_fndecls) |
7d5b8b11 MM |
2399 | { |
2400 | /* Here we know it is a hider, and no overrider exists. */ | |
dee15844 JM |
2401 | warning (0, "%q+D was hidden", TREE_VALUE (base_fndecls)); |
2402 | warning (0, " by %q+D", fns); | |
7d5b8b11 MM |
2403 | base_fndecls = TREE_CHAIN (base_fndecls); |
2404 | } | |
9e9ff709 MS |
2405 | } |
2406 | } | |
2407 | ||
2408 | /* Check for things that are invalid. There are probably plenty of other | |
2409 | things we should check for also. */ | |
e92cc029 | 2410 | |
9e9ff709 | 2411 | static void |
94edc4ab | 2412 | finish_struct_anon (tree t) |
9e9ff709 MS |
2413 | { |
2414 | tree field; | |
f90cdf34 | 2415 | |
9e9ff709 MS |
2416 | for (field = TYPE_FIELDS (t); field; field = TREE_CHAIN (field)) |
2417 | { | |
2418 | if (TREE_STATIC (field)) | |
2419 | continue; | |
2420 | if (TREE_CODE (field) != FIELD_DECL) | |
2421 | continue; | |
2422 | ||
2423 | if (DECL_NAME (field) == NULL_TREE | |
6bdb8141 | 2424 | && ANON_AGGR_TYPE_P (TREE_TYPE (field))) |
9e9ff709 | 2425 | { |
f90cdf34 MT |
2426 | tree elt = TYPE_FIELDS (TREE_TYPE (field)); |
2427 | for (; elt; elt = TREE_CHAIN (elt)) | |
9e9ff709 | 2428 | { |
b7076960 MM |
2429 | /* We're generally only interested in entities the user |
2430 | declared, but we also find nested classes by noticing | |
2431 | the TYPE_DECL that we create implicitly. You're | |
2432 | allowed to put one anonymous union inside another, | |
6f32162a JM |
2433 | though, so we explicitly tolerate that. We use |
2434 | TYPE_ANONYMOUS_P rather than ANON_AGGR_TYPE_P so that | |
2435 | we also allow unnamed types used for defining fields. */ | |
c8094d83 | 2436 | if (DECL_ARTIFICIAL (elt) |
b7076960 | 2437 | && (!DECL_IMPLICIT_TYPEDEF_P (elt) |
6f32162a | 2438 | || TYPE_ANONYMOUS_P (TREE_TYPE (elt)))) |
9e9ff709 MS |
2439 | continue; |
2440 | ||
f90cdf34 | 2441 | if (TREE_CODE (elt) != FIELD_DECL) |
8ebeee52 | 2442 | { |
dee15844 JM |
2443 | pedwarn ("%q+#D invalid; an anonymous union can " |
2444 | "only have non-static data members", elt); | |
8ebeee52 JM |
2445 | continue; |
2446 | } | |
2447 | ||
f90cdf34 | 2448 | if (TREE_PRIVATE (elt)) |
dee15844 | 2449 | pedwarn ("private member %q+#D in anonymous union", elt); |
f90cdf34 | 2450 | else if (TREE_PROTECTED (elt)) |
dee15844 | 2451 | pedwarn ("protected member %q+#D in anonymous union", elt); |
fc378698 | 2452 | |
f90cdf34 MT |
2453 | TREE_PRIVATE (elt) = TREE_PRIVATE (field); |
2454 | TREE_PROTECTED (elt) = TREE_PROTECTED (field); | |
9e9ff709 MS |
2455 | } |
2456 | } | |
2457 | } | |
2458 | } | |
2459 | ||
7088fca9 KL |
2460 | /* Add T to CLASSTYPE_DECL_LIST of current_class_type which |
2461 | will be used later during class template instantiation. | |
2462 | When FRIEND_P is zero, T can be a static member data (VAR_DECL), | |
2463 | a non-static member data (FIELD_DECL), a member function | |
c8094d83 | 2464 | (FUNCTION_DECL), a nested type (RECORD_TYPE, ENUM_TYPE), |
7088fca9 KL |
2465 | a typedef (TYPE_DECL) or a member class template (TEMPLATE_DECL) |
2466 | When FRIEND_P is nonzero, T is either a friend class | |
2467 | (RECORD_TYPE, TEMPLATE_DECL) or a friend function | |
2468 | (FUNCTION_DECL, TEMPLATE_DECL). */ | |
2469 | ||
2470 | void | |
94edc4ab | 2471 | maybe_add_class_template_decl_list (tree type, tree t, int friend_p) |
7088fca9 KL |
2472 | { |
2473 | /* Save some memory by not creating TREE_LIST if TYPE is not template. */ | |
2474 | if (CLASSTYPE_TEMPLATE_INFO (type)) | |
2475 | CLASSTYPE_DECL_LIST (type) | |
2476 | = tree_cons (friend_p ? NULL_TREE : type, | |
2477 | t, CLASSTYPE_DECL_LIST (type)); | |
2478 | } | |
2479 | ||
61a127b3 | 2480 | /* Create default constructors, assignment operators, and so forth for |
e5e459bf AO |
2481 | the type indicated by T, if they are needed. CANT_HAVE_CONST_CTOR, |
2482 | and CANT_HAVE_CONST_ASSIGNMENT are nonzero if, for whatever reason, | |
2483 | the class cannot have a default constructor, copy constructor | |
2484 | taking a const reference argument, or an assignment operator taking | |
2485 | a const reference, respectively. */ | |
61a127b3 | 2486 | |
f72ab53b | 2487 | static void |
c8094d83 | 2488 | add_implicitly_declared_members (tree t, |
94edc4ab NN |
2489 | int cant_have_const_cctor, |
2490 | int cant_have_const_assignment) | |
61a127b3 | 2491 | { |
61a127b3 | 2492 | /* Destructor. */ |
9f4faeae | 2493 | if (!CLASSTYPE_DESTRUCTORS (t)) |
61a127b3 | 2494 | { |
9f4faeae MM |
2495 | /* In general, we create destructors lazily. */ |
2496 | CLASSTYPE_LAZY_DESTRUCTOR (t) = 1; | |
2497 | /* However, if the implicit destructor is non-trivial | |
2498 | destructor, we sometimes have to create it at this point. */ | |
2499 | if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (t)) | |
2500 | { | |
2501 | bool lazy_p = true; | |
61a127b3 | 2502 | |
9f4faeae MM |
2503 | if (TYPE_FOR_JAVA (t)) |
2504 | /* If this a Java class, any non-trivial destructor is | |
2505 | invalid, even if compiler-generated. Therefore, if the | |
2506 | destructor is non-trivial we create it now. */ | |
2507 | lazy_p = false; | |
2508 | else | |
2509 | { | |
2510 | tree binfo; | |
2511 | tree base_binfo; | |
2512 | int ix; | |
2513 | ||
2514 | /* If the implicit destructor will be virtual, then we must | |
2515 | generate it now because (unfortunately) we do not | |
2516 | generate virtual tables lazily. */ | |
2517 | binfo = TYPE_BINFO (t); | |
2518 | for (ix = 0; BINFO_BASE_ITERATE (binfo, ix, base_binfo); ix++) | |
2519 | { | |
2520 | tree base_type; | |
2521 | tree dtor; | |
2522 | ||
2523 | base_type = BINFO_TYPE (base_binfo); | |
2524 | dtor = CLASSTYPE_DESTRUCTORS (base_type); | |
2525 | if (dtor && DECL_VIRTUAL_P (dtor)) | |
2526 | { | |
2527 | lazy_p = false; | |
2528 | break; | |
2529 | } | |
2530 | } | |
2531 | } | |
2532 | ||
2533 | /* If we can't get away with being lazy, generate the destructor | |
c8094d83 | 2534 | now. */ |
9f4faeae MM |
2535 | if (!lazy_p) |
2536 | lazily_declare_fn (sfk_destructor, t); | |
2537 | } | |
61a127b3 | 2538 | } |
61a127b3 MM |
2539 | |
2540 | /* Default constructor. */ | |
e5e459bf | 2541 | if (! TYPE_HAS_CONSTRUCTOR (t)) |
61a127b3 | 2542 | { |
508a1c9c MM |
2543 | TYPE_HAS_DEFAULT_CONSTRUCTOR (t) = 1; |
2544 | CLASSTYPE_LAZY_DEFAULT_CTOR (t) = 1; | |
61a127b3 MM |
2545 | } |
2546 | ||
2547 | /* Copy constructor. */ | |
6eabb241 | 2548 | if (! TYPE_HAS_INIT_REF (t) && ! TYPE_FOR_JAVA (t)) |
61a127b3 | 2549 | { |
508a1c9c MM |
2550 | TYPE_HAS_INIT_REF (t) = 1; |
2551 | TYPE_HAS_CONST_INIT_REF (t) = !cant_have_const_cctor; | |
2552 | CLASSTYPE_LAZY_COPY_CTOR (t) = 1; | |
2553 | TYPE_HAS_CONSTRUCTOR (t) = 1; | |
61a127b3 MM |
2554 | } |
2555 | ||
aaaa46d2 MM |
2556 | /* If there is no assignment operator, one will be created if and |
2557 | when it is needed. For now, just record whether or not the type | |
2558 | of the parameter to the assignment operator will be a const or | |
2559 | non-const reference. */ | |
2560 | if (!TYPE_HAS_ASSIGN_REF (t) && !TYPE_FOR_JAVA (t)) | |
fb232476 MM |
2561 | { |
2562 | TYPE_HAS_ASSIGN_REF (t) = 1; | |
2563 | TYPE_HAS_CONST_ASSIGN_REF (t) = !cant_have_const_assignment; | |
2564 | CLASSTYPE_LAZY_ASSIGNMENT_OP (t) = 1; | |
2565 | } | |
61a127b3 MM |
2566 | } |
2567 | ||
f90cdf34 MT |
2568 | /* Subroutine of finish_struct_1. Recursively count the number of fields |
2569 | in TYPE, including anonymous union members. */ | |
2570 | ||
2571 | static int | |
94edc4ab | 2572 | count_fields (tree fields) |
f90cdf34 MT |
2573 | { |
2574 | tree x; | |
2575 | int n_fields = 0; | |
2576 | for (x = fields; x; x = TREE_CHAIN (x)) | |
2577 | { | |
2578 | if (TREE_CODE (x) == FIELD_DECL && ANON_AGGR_TYPE_P (TREE_TYPE (x))) | |
2579 | n_fields += count_fields (TYPE_FIELDS (TREE_TYPE (x))); | |
2580 | else | |
2581 | n_fields += 1; | |
2582 | } | |
2583 | return n_fields; | |
2584 | } | |
2585 | ||
2586 | /* Subroutine of finish_struct_1. Recursively add all the fields in the | |
d07605f5 | 2587 | TREE_LIST FIELDS to the SORTED_FIELDS_TYPE elts, starting at offset IDX. */ |
f90cdf34 MT |
2588 | |
2589 | static int | |
d07605f5 | 2590 | add_fields_to_record_type (tree fields, struct sorted_fields_type *field_vec, int idx) |
f90cdf34 MT |
2591 | { |
2592 | tree x; | |
2593 | for (x = fields; x; x = TREE_CHAIN (x)) | |
2594 | { | |
2595 | if (TREE_CODE (x) == FIELD_DECL && ANON_AGGR_TYPE_P (TREE_TYPE (x))) | |
d07605f5 | 2596 | idx = add_fields_to_record_type (TYPE_FIELDS (TREE_TYPE (x)), field_vec, idx); |
f90cdf34 | 2597 | else |
d07605f5 | 2598 | field_vec->elts[idx++] = x; |
f90cdf34 MT |
2599 | } |
2600 | return idx; | |
2601 | } | |
2602 | ||
1e30f9b4 MM |
2603 | /* FIELD is a bit-field. We are finishing the processing for its |
2604 | enclosing type. Issue any appropriate messages and set appropriate | |
2605 | flags. */ | |
2606 | ||
2607 | static void | |
94edc4ab | 2608 | check_bitfield_decl (tree field) |
1e30f9b4 MM |
2609 | { |
2610 | tree type = TREE_TYPE (field); | |
cd8ed629 | 2611 | tree w = NULL_TREE; |
1e30f9b4 | 2612 | |
cd8ed629 | 2613 | /* Detect invalid bit-field type. */ |
1e30f9b4 MM |
2614 | if (DECL_INITIAL (field) |
2615 | && ! INTEGRAL_TYPE_P (TREE_TYPE (field))) | |
2616 | { | |
dee15844 | 2617 | error ("bit-field %q+#D with non-integral type", field); |
cd8ed629 | 2618 | w = error_mark_node; |
1e30f9b4 MM |
2619 | } |
2620 | ||
2621 | /* Detect and ignore out of range field width. */ | |
2622 | if (DECL_INITIAL (field)) | |
2623 | { | |
cd8ed629 | 2624 | w = DECL_INITIAL (field); |
1e30f9b4 MM |
2625 | |
2626 | /* Avoid the non_lvalue wrapper added by fold for PLUS_EXPRs. */ | |
2627 | STRIP_NOPS (w); | |
2628 | ||
2629 | /* detect invalid field size. */ | |
8a784e4a | 2630 | w = integral_constant_value (w); |
1e30f9b4 MM |
2631 | |
2632 | if (TREE_CODE (w) != INTEGER_CST) | |
2633 | { | |
dee15844 | 2634 | error ("bit-field %q+D width not an integer constant", field); |
cd8ed629 | 2635 | w = error_mark_node; |
1e30f9b4 | 2636 | } |
05bccae2 | 2637 | else if (tree_int_cst_sgn (w) < 0) |
1e30f9b4 | 2638 | { |
dee15844 | 2639 | error ("negative width in bit-field %q+D", field); |
cd8ed629 | 2640 | w = error_mark_node; |
1e30f9b4 | 2641 | } |
05bccae2 | 2642 | else if (integer_zerop (w) && DECL_NAME (field) != 0) |
1e30f9b4 | 2643 | { |
dee15844 | 2644 | error ("zero width for bit-field %q+D", field); |
cd8ed629 | 2645 | w = error_mark_node; |
1e30f9b4 | 2646 | } |
05bccae2 | 2647 | else if (compare_tree_int (w, TYPE_PRECISION (type)) > 0 |
1e30f9b4 MM |
2648 | && TREE_CODE (type) != ENUMERAL_TYPE |
2649 | && TREE_CODE (type) != BOOLEAN_TYPE) | |
dee15844 | 2650 | warning (0, "width of %q+D exceeds its type", field); |
1e30f9b4 | 2651 | else if (TREE_CODE (type) == ENUMERAL_TYPE |
05bccae2 RK |
2652 | && (0 > compare_tree_int (w, |
2653 | min_precision (TYPE_MIN_VALUE (type), | |
8df83eae | 2654 | TYPE_UNSIGNED (type))) |
05bccae2 RK |
2655 | || 0 > compare_tree_int (w, |
2656 | min_precision | |
2657 | (TYPE_MAX_VALUE (type), | |
8df83eae | 2658 | TYPE_UNSIGNED (type))))) |
dee15844 | 2659 | warning (0, "%q+D is too small to hold all values of %q#T", field, type); |
cd8ed629 | 2660 | } |
c8094d83 | 2661 | |
cd8ed629 MM |
2662 | /* Remove the bit-field width indicator so that the rest of the |
2663 | compiler does not treat that value as an initializer. */ | |
2664 | DECL_INITIAL (field) = NULL_TREE; | |
1e30f9b4 | 2665 | |
cd8ed629 MM |
2666 | if (w != error_mark_node) |
2667 | { | |
2668 | DECL_SIZE (field) = convert (bitsizetype, w); | |
2669 | DECL_BIT_FIELD (field) = 1; | |
1e30f9b4 MM |
2670 | } |
2671 | else | |
cd8ed629 MM |
2672 | { |
2673 | /* Non-bit-fields are aligned for their type. */ | |
2674 | DECL_BIT_FIELD (field) = 0; | |
2675 | CLEAR_DECL_C_BIT_FIELD (field); | |
cd8ed629 | 2676 | } |
1e30f9b4 MM |
2677 | } |
2678 | ||
2679 | /* FIELD is a non bit-field. We are finishing the processing for its | |
2680 | enclosing type T. Issue any appropriate messages and set appropriate | |
2681 | flags. */ | |
2682 | ||
2683 | static void | |
94edc4ab | 2684 | check_field_decl (tree field, |
0cbd7506 MS |
2685 | tree t, |
2686 | int* cant_have_const_ctor, | |
2687 | int* no_const_asn_ref, | |
94edc4ab | 2688 | int* any_default_members) |
1e30f9b4 MM |
2689 | { |
2690 | tree type = strip_array_types (TREE_TYPE (field)); | |
2691 | ||
2692 | /* An anonymous union cannot contain any fields which would change | |
2693 | the settings of CANT_HAVE_CONST_CTOR and friends. */ | |
2694 | if (ANON_UNION_TYPE_P (type)) | |
2695 | ; | |
2696 | /* And, we don't set TYPE_HAS_CONST_INIT_REF, etc., for anonymous | |
2697 | structs. So, we recurse through their fields here. */ | |
2698 | else if (ANON_AGGR_TYPE_P (type)) | |
2699 | { | |
2700 | tree fields; | |
2701 | ||
2702 | for (fields = TYPE_FIELDS (type); fields; fields = TREE_CHAIN (fields)) | |
17aec3eb | 2703 | if (TREE_CODE (fields) == FIELD_DECL && !DECL_C_BIT_FIELD (field)) |
1e30f9b4 | 2704 | check_field_decl (fields, t, cant_have_const_ctor, |
e5e459bf | 2705 | no_const_asn_ref, any_default_members); |
1e30f9b4 MM |
2706 | } |
2707 | /* Check members with class type for constructors, destructors, | |
2708 | etc. */ | |
2709 | else if (CLASS_TYPE_P (type)) | |
2710 | { | |
2711 | /* Never let anything with uninheritable virtuals | |
2712 | make it through without complaint. */ | |
2713 | abstract_virtuals_error (field, type); | |
c8094d83 | 2714 | |
1e30f9b4 MM |
2715 | if (TREE_CODE (t) == UNION_TYPE) |
2716 | { | |
2717 | if (TYPE_NEEDS_CONSTRUCTING (type)) | |
dee15844 JM |
2718 | error ("member %q+#D with constructor not allowed in union", |
2719 | field); | |
834c6dff | 2720 | if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type)) |
dee15844 | 2721 | error ("member %q+#D with destructor not allowed in union", field); |
1e30f9b4 | 2722 | if (TYPE_HAS_COMPLEX_ASSIGN_REF (type)) |
dee15844 JM |
2723 | error ("member %q+#D with copy assignment operator not allowed in union", |
2724 | field); | |
1e30f9b4 MM |
2725 | } |
2726 | else | |
2727 | { | |
2728 | TYPE_NEEDS_CONSTRUCTING (t) |= TYPE_NEEDS_CONSTRUCTING (type); | |
c8094d83 | 2729 | TYPE_HAS_NONTRIVIAL_DESTRUCTOR (t) |
834c6dff | 2730 | |= TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type); |
1e30f9b4 MM |
2731 | TYPE_HAS_COMPLEX_ASSIGN_REF (t) |= TYPE_HAS_COMPLEX_ASSIGN_REF (type); |
2732 | TYPE_HAS_COMPLEX_INIT_REF (t) |= TYPE_HAS_COMPLEX_INIT_REF (type); | |
2733 | } | |
2734 | ||
2735 | if (!TYPE_HAS_CONST_INIT_REF (type)) | |
2736 | *cant_have_const_ctor = 1; | |
2737 | ||
2738 | if (!TYPE_HAS_CONST_ASSIGN_REF (type)) | |
2739 | *no_const_asn_ref = 1; | |
1e30f9b4 MM |
2740 | } |
2741 | if (DECL_INITIAL (field) != NULL_TREE) | |
2742 | { | |
2743 | /* `build_class_init_list' does not recognize | |
2744 | non-FIELD_DECLs. */ | |
2745 | if (TREE_CODE (t) == UNION_TYPE && any_default_members != 0) | |
1f070f2b | 2746 | error ("multiple fields in union %qT initialized", t); |
1e30f9b4 MM |
2747 | *any_default_members = 1; |
2748 | } | |
6bb88f3b | 2749 | } |
1e30f9b4 | 2750 | |
08b962b0 MM |
2751 | /* Check the data members (both static and non-static), class-scoped |
2752 | typedefs, etc., appearing in the declaration of T. Issue | |
2753 | appropriate diagnostics. Sets ACCESS_DECLS to a list (in | |
2754 | declaration order) of access declarations; each TREE_VALUE in this | |
2755 | list is a USING_DECL. | |
8d08fdba | 2756 | |
08b962b0 | 2757 | In addition, set the following flags: |
8d08fdba | 2758 | |
08b962b0 MM |
2759 | EMPTY_P |
2760 | The class is empty, i.e., contains no non-static data members. | |
8d08fdba | 2761 | |
08b962b0 MM |
2762 | CANT_HAVE_CONST_CTOR_P |
2763 | This class cannot have an implicitly generated copy constructor | |
2764 | taking a const reference. | |
8d08fdba | 2765 | |
08b962b0 MM |
2766 | CANT_HAVE_CONST_ASN_REF |
2767 | This class cannot have an implicitly generated assignment | |
2768 | operator taking a const reference. | |
8d08fdba | 2769 | |
08b962b0 MM |
2770 | All of these flags should be initialized before calling this |
2771 | function. | |
8d08fdba | 2772 | |
08b962b0 MM |
2773 | Returns a pointer to the end of the TYPE_FIELDs chain; additional |
2774 | fields can be added by adding to this chain. */ | |
8d08fdba | 2775 | |
607cf131 | 2776 | static void |
58731fd1 | 2777 | check_field_decls (tree t, tree *access_decls, |
58731fd1 MM |
2778 | int *cant_have_const_ctor_p, |
2779 | int *no_const_asn_ref_p) | |
08b962b0 MM |
2780 | { |
2781 | tree *field; | |
2782 | tree *next; | |
dd29d26b | 2783 | bool has_pointers; |
08b962b0 MM |
2784 | int any_default_members; |
2785 | ||
2786 | /* Assume there are no access declarations. */ | |
2787 | *access_decls = NULL_TREE; | |
2788 | /* Assume this class has no pointer members. */ | |
dd29d26b | 2789 | has_pointers = false; |
08b962b0 MM |
2790 | /* Assume none of the members of this class have default |
2791 | initializations. */ | |
2792 | any_default_members = 0; | |
2793 | ||
2794 | for (field = &TYPE_FIELDS (t); *field; field = next) | |
8d08fdba | 2795 | { |
08b962b0 MM |
2796 | tree x = *field; |
2797 | tree type = TREE_TYPE (x); | |
8d08fdba | 2798 | |
08b962b0 | 2799 | next = &TREE_CHAIN (x); |
8d08fdba | 2800 | |
c91a56d2 | 2801 | if (TREE_CODE (x) == FIELD_DECL) |
691c003d | 2802 | { |
e0d1297c NS |
2803 | if (TYPE_PACKED (t)) |
2804 | { | |
2805 | if (!pod_type_p (TREE_TYPE (x)) && !TYPE_PACKED (TREE_TYPE (x))) | |
dee15844 JM |
2806 | warning |
2807 | (0, | |
2808 | "ignoring packed attribute on unpacked non-POD field %q+#D", | |
e0d1297c | 2809 | x); |
646c0835 | 2810 | else if (TYPE_ALIGN (TREE_TYPE (x)) > BITS_PER_UNIT) |
e0d1297c NS |
2811 | DECL_PACKED (x) = 1; |
2812 | } | |
e6267549 JM |
2813 | |
2814 | if (DECL_C_BIT_FIELD (x) && integer_zerop (DECL_INITIAL (x))) | |
08b962b0 MM |
2815 | /* We don't treat zero-width bitfields as making a class |
2816 | non-empty. */ | |
2817 | ; | |
e6267549 | 2818 | else |
f9c528ea | 2819 | { |
5ec1192e MM |
2820 | tree element_type; |
2821 | ||
f9c528ea | 2822 | /* The class is non-empty. */ |
58731fd1 | 2823 | CLASSTYPE_EMPTY_P (t) = 0; |
f9c528ea MM |
2824 | /* The class is not even nearly empty. */ |
2825 | CLASSTYPE_NEARLY_EMPTY_P (t) = 0; | |
5ec1192e MM |
2826 | /* If one of the data members contains an empty class, |
2827 | so does T. */ | |
2828 | element_type = strip_array_types (type); | |
c8094d83 | 2829 | if (CLASS_TYPE_P (element_type) |
5ec1192e | 2830 | && CLASSTYPE_CONTAINS_EMPTY_CLASS_P (element_type)) |
aa06d37b | 2831 | CLASSTYPE_CONTAINS_EMPTY_CLASS_P (t) = 1; |
f9c528ea | 2832 | } |
691c003d | 2833 | } |
c91a56d2 | 2834 | |
cffa8729 | 2835 | if (TREE_CODE (x) == USING_DECL) |
f30432d7 | 2836 | { |
08b962b0 MM |
2837 | /* Prune the access declaration from the list of fields. */ |
2838 | *field = TREE_CHAIN (x); | |
2839 | ||
2840 | /* Save the access declarations for our caller. */ | |
2841 | *access_decls = tree_cons (NULL_TREE, x, *access_decls); | |
2842 | ||
2843 | /* Since we've reset *FIELD there's no reason to skip to the | |
2844 | next field. */ | |
2845 | next = field; | |
f30432d7 MS |
2846 | continue; |
2847 | } | |
8d08fdba | 2848 | |
050367a3 MM |
2849 | if (TREE_CODE (x) == TYPE_DECL |
2850 | || TREE_CODE (x) == TEMPLATE_DECL) | |
f30432d7 | 2851 | continue; |
8d08fdba | 2852 | |
f30432d7 | 2853 | /* If we've gotten this far, it's a data member, possibly static, |
e92cc029 | 2854 | or an enumerator. */ |
17aec3eb | 2855 | DECL_CONTEXT (x) = t; |
8d08fdba | 2856 | |
58ec3cc5 MM |
2857 | /* When this goes into scope, it will be a non-local reference. */ |
2858 | DECL_NONLOCAL (x) = 1; | |
2859 | ||
2860 | if (TREE_CODE (t) == UNION_TYPE) | |
2861 | { | |
2862 | /* [class.union] | |
2863 | ||
2864 | If a union contains a static data member, or a member of | |
324f9dfb | 2865 | reference type, the program is ill-formed. */ |
58ec3cc5 MM |
2866 | if (TREE_CODE (x) == VAR_DECL) |
2867 | { | |
dee15844 | 2868 | error ("%q+D may not be static because it is a member of a union", x); |
58ec3cc5 MM |
2869 | continue; |
2870 | } | |
2871 | if (TREE_CODE (type) == REFERENCE_TYPE) | |
2872 | { | |
dee15844 JM |
2873 | error ("%q+D may not have reference type %qT because" |
2874 | " it is a member of a union", | |
2875 | x, type); | |
58ec3cc5 MM |
2876 | continue; |
2877 | } | |
2878 | } | |
2879 | ||
f30432d7 MS |
2880 | /* ``A local class cannot have static data members.'' ARM 9.4 */ |
2881 | if (current_function_decl && TREE_STATIC (x)) | |
dee15844 | 2882 | error ("field %q+D in local class cannot be static", x); |
8d08fdba | 2883 | |
f30432d7 MS |
2884 | /* Perform error checking that did not get done in |
2885 | grokdeclarator. */ | |
52fb2769 | 2886 | if (TREE_CODE (type) == FUNCTION_TYPE) |
f30432d7 | 2887 | { |
dee15844 | 2888 | error ("field %q+D invalidly declared function type", x); |
52fb2769 NS |
2889 | type = build_pointer_type (type); |
2890 | TREE_TYPE (x) = type; | |
f30432d7 | 2891 | } |
52fb2769 | 2892 | else if (TREE_CODE (type) == METHOD_TYPE) |
f30432d7 | 2893 | { |
dee15844 | 2894 | error ("field %q+D invalidly declared method type", x); |
52fb2769 NS |
2895 | type = build_pointer_type (type); |
2896 | TREE_TYPE (x) = type; | |
f30432d7 | 2897 | } |
8d08fdba | 2898 | |
52fb2769 | 2899 | if (type == error_mark_node) |
f30432d7 | 2900 | continue; |
c8094d83 | 2901 | |
58ec3cc5 | 2902 | if (TREE_CODE (x) == CONST_DECL || TREE_CODE (x) == VAR_DECL) |
73a8adb6 | 2903 | continue; |
8d08fdba | 2904 | |
f30432d7 | 2905 | /* Now it can only be a FIELD_DECL. */ |
8d08fdba | 2906 | |
f30432d7 | 2907 | if (TREE_PRIVATE (x) || TREE_PROTECTED (x)) |
08b962b0 | 2908 | CLASSTYPE_NON_AGGREGATE (t) = 1; |
8d08fdba | 2909 | |
f30432d7 MS |
2910 | /* If this is of reference type, check if it needs an init. |
2911 | Also do a little ANSI jig if necessary. */ | |
52fb2769 | 2912 | if (TREE_CODE (type) == REFERENCE_TYPE) |
0cbd7506 | 2913 | { |
08b962b0 | 2914 | CLASSTYPE_NON_POD_P (t) = 1; |
f30432d7 | 2915 | if (DECL_INITIAL (x) == NULL_TREE) |
6eb35968 | 2916 | SET_CLASSTYPE_REF_FIELDS_NEED_INIT (t, 1); |
8d08fdba | 2917 | |
f30432d7 MS |
2918 | /* ARM $12.6.2: [A member initializer list] (or, for an |
2919 | aggregate, initialization by a brace-enclosed list) is the | |
2920 | only way to initialize nonstatic const and reference | |
2921 | members. */ | |
e349ee73 | 2922 | TYPE_HAS_COMPLEX_ASSIGN_REF (t) = 1; |
f30432d7 | 2923 | |
b930e428 MA |
2924 | if (! TYPE_HAS_CONSTRUCTOR (t) && CLASSTYPE_NON_AGGREGATE (t) |
2925 | && extra_warnings) | |
dee15844 | 2926 | warning (0, "non-static reference %q+#D in class without a constructor", x); |
f30432d7 | 2927 | } |
8d08fdba | 2928 | |
1e30f9b4 | 2929 | type = strip_array_types (type); |
dd29d26b GB |
2930 | |
2931 | /* This is used by -Weffc++ (see below). Warn only for pointers | |
2932 | to members which might hold dynamic memory. So do not warn | |
2933 | for pointers to functions or pointers to members. */ | |
2934 | if (TYPE_PTR_P (type) | |
2935 | && !TYPE_PTRFN_P (type) | |
2936 | && !TYPE_PTR_TO_MEMBER_P (type)) | |
2937 | has_pointers = true; | |
824b9a4c | 2938 | |
58ec3cc5 MM |
2939 | if (CLASS_TYPE_P (type)) |
2940 | { | |
2941 | if (CLASSTYPE_REF_FIELDS_NEED_INIT (type)) | |
2942 | SET_CLASSTYPE_REF_FIELDS_NEED_INIT (t, 1); | |
2943 | if (CLASSTYPE_READONLY_FIELDS_NEED_INIT (type)) | |
2944 | SET_CLASSTYPE_READONLY_FIELDS_NEED_INIT (t, 1); | |
2945 | } | |
2946 | ||
52fb2769 | 2947 | if (DECL_MUTABLE_P (x) || TYPE_HAS_MUTABLE_P (type)) |
08b962b0 | 2948 | CLASSTYPE_HAS_MUTABLE (t) = 1; |
a7a7710d | 2949 | |
d282fcb2 | 2950 | if (! pod_type_p (type)) |
0cbd7506 MS |
2951 | /* DR 148 now allows pointers to members (which are POD themselves), |
2952 | to be allowed in POD structs. */ | |
08b962b0 | 2953 | CLASSTYPE_NON_POD_P (t) = 1; |
52fb2769 | 2954 | |
94e6e4c4 AO |
2955 | if (! zero_init_p (type)) |
2956 | CLASSTYPE_NON_ZERO_INIT_P (t) = 1; | |
2957 | ||
f30432d7 | 2958 | /* If any field is const, the structure type is pseudo-const. */ |
52fb2769 | 2959 | if (CP_TYPE_CONST_P (type)) |
f30432d7 MS |
2960 | { |
2961 | C_TYPE_FIELDS_READONLY (t) = 1; | |
2962 | if (DECL_INITIAL (x) == NULL_TREE) | |
6eb35968 | 2963 | SET_CLASSTYPE_READONLY_FIELDS_NEED_INIT (t, 1); |
f30432d7 MS |
2964 | |
2965 | /* ARM $12.6.2: [A member initializer list] (or, for an | |
2966 | aggregate, initialization by a brace-enclosed list) is the | |
2967 | only way to initialize nonstatic const and reference | |
2968 | members. */ | |
e349ee73 | 2969 | TYPE_HAS_COMPLEX_ASSIGN_REF (t) = 1; |
f30432d7 | 2970 | |
b930e428 MA |
2971 | if (! TYPE_HAS_CONSTRUCTOR (t) && CLASSTYPE_NON_AGGREGATE (t) |
2972 | && extra_warnings) | |
dee15844 | 2973 | warning (0, "non-static const member %q+#D in class without a constructor", x); |
f30432d7 | 2974 | } |
08b962b0 | 2975 | /* A field that is pseudo-const makes the structure likewise. */ |
5552b43c | 2976 | else if (CLASS_TYPE_P (type)) |
f30432d7 | 2977 | { |
08b962b0 | 2978 | C_TYPE_FIELDS_READONLY (t) |= C_TYPE_FIELDS_READONLY (type); |
6eb35968 DE |
2979 | SET_CLASSTYPE_READONLY_FIELDS_NEED_INIT (t, |
2980 | CLASSTYPE_READONLY_FIELDS_NEED_INIT (t) | |
2981 | | CLASSTYPE_READONLY_FIELDS_NEED_INIT (type)); | |
f30432d7 | 2982 | } |
8d08fdba | 2983 | |
c10bffd0 JM |
2984 | /* Core issue 80: A nonstatic data member is required to have a |
2985 | different name from the class iff the class has a | |
2986 | user-defined constructor. */ | |
633221db | 2987 | if (constructor_name_p (DECL_NAME (x), t) && TYPE_HAS_CONSTRUCTOR (t)) |
dee15844 | 2988 | pedwarn ("field %q+#D with same name as class", x); |
c10bffd0 | 2989 | |
162bc98d JM |
2990 | /* We set DECL_C_BIT_FIELD in grokbitfield. |
2991 | If the type and width are valid, we'll also set DECL_BIT_FIELD. */ | |
2992 | if (DECL_C_BIT_FIELD (x)) | |
1e30f9b4 | 2993 | check_bitfield_decl (x); |
f30432d7 | 2994 | else |
1e30f9b4 | 2995 | check_field_decl (x, t, |
08b962b0 | 2996 | cant_have_const_ctor_p, |
08b962b0 | 2997 | no_const_asn_ref_p, |
1e30f9b4 | 2998 | &any_default_members); |
8d08fdba MS |
2999 | } |
3000 | ||
dd29d26b GB |
3001 | /* Effective C++ rule 11: if a class has dynamic memory held by pointers, |
3002 | it should also define a copy constructor and an assignment operator to | |
3003 | implement the correct copy semantic (deep vs shallow, etc.). As it is | |
3004 | not feasible to check whether the constructors do allocate dynamic memory | |
3005 | and store it within members, we approximate the warning like this: | |
3006 | ||
3007 | -- Warn only if there are members which are pointers | |
3008 | -- Warn only if there is a non-trivial constructor (otherwise, | |
3009 | there cannot be memory allocated). | |
3010 | -- Warn only if there is a non-trivial destructor. We assume that the | |
3011 | user at least implemented the cleanup correctly, and a destructor | |
3012 | is needed to free dynamic memory. | |
c8094d83 | 3013 | |
77880ae4 | 3014 | This seems enough for practical purposes. */ |
dd29d26b GB |
3015 | if (warn_ecpp |
3016 | && has_pointers | |
3017 | && TYPE_HAS_CONSTRUCTOR (t) | |
9f4faeae | 3018 | && TYPE_HAS_NONTRIVIAL_DESTRUCTOR (t) |
dd29d26b | 3019 | && !(TYPE_HAS_INIT_REF (t) && TYPE_HAS_ASSIGN_REF (t))) |
824b9a4c | 3020 | { |
d4ee4d25 | 3021 | warning (0, "%q#T has pointer data members", t); |
c8094d83 | 3022 | |
824b9a4c MS |
3023 | if (! TYPE_HAS_INIT_REF (t)) |
3024 | { | |
d4ee4d25 | 3025 | warning (0, " but does not override %<%T(const %T&)%>", t, t); |
824b9a4c | 3026 | if (! TYPE_HAS_ASSIGN_REF (t)) |
d4ee4d25 | 3027 | warning (0, " or %<operator=(const %T&)%>", t); |
824b9a4c MS |
3028 | } |
3029 | else if (! TYPE_HAS_ASSIGN_REF (t)) | |
d4ee4d25 | 3030 | warning (0, " but does not override %<operator=(const %T&)%>", t); |
824b9a4c | 3031 | } |
08b962b0 | 3032 | |
607cf131 MM |
3033 | |
3034 | /* Check anonymous struct/anonymous union fields. */ | |
3035 | finish_struct_anon (t); | |
3036 | ||
08b962b0 MM |
3037 | /* We've built up the list of access declarations in reverse order. |
3038 | Fix that now. */ | |
3039 | *access_decls = nreverse (*access_decls); | |
08b962b0 MM |
3040 | } |
3041 | ||
c20118a8 MM |
3042 | /* If TYPE is an empty class type, records its OFFSET in the table of |
3043 | OFFSETS. */ | |
607cf131 | 3044 | |
c20118a8 | 3045 | static int |
94edc4ab | 3046 | record_subobject_offset (tree type, tree offset, splay_tree offsets) |
5c24fba6 | 3047 | { |
c20118a8 | 3048 | splay_tree_node n; |
5c24fba6 | 3049 | |
c20118a8 MM |
3050 | if (!is_empty_class (type)) |
3051 | return 0; | |
5c24fba6 | 3052 | |
c20118a8 MM |
3053 | /* Record the location of this empty object in OFFSETS. */ |
3054 | n = splay_tree_lookup (offsets, (splay_tree_key) offset); | |
3055 | if (!n) | |
c8094d83 | 3056 | n = splay_tree_insert (offsets, |
c20118a8 MM |
3057 | (splay_tree_key) offset, |
3058 | (splay_tree_value) NULL_TREE); | |
c8094d83 | 3059 | n->value = ((splay_tree_value) |
c20118a8 MM |
3060 | tree_cons (NULL_TREE, |
3061 | type, | |
3062 | (tree) n->value)); | |
3063 | ||
3064 | return 0; | |
607cf131 MM |
3065 | } |
3066 | ||
838dfd8a | 3067 | /* Returns nonzero if TYPE is an empty class type and there is |
c20118a8 | 3068 | already an entry in OFFSETS for the same TYPE as the same OFFSET. */ |
9785e4b1 | 3069 | |
c20118a8 | 3070 | static int |
94edc4ab | 3071 | check_subobject_offset (tree type, tree offset, splay_tree offsets) |
9785e4b1 | 3072 | { |
c20118a8 MM |
3073 | splay_tree_node n; |
3074 | tree t; | |
3075 | ||
3076 | if (!is_empty_class (type)) | |
3077 | return 0; | |
3078 | ||
3079 | /* Record the location of this empty object in OFFSETS. */ | |
3080 | n = splay_tree_lookup (offsets, (splay_tree_key) offset); | |
3081 | if (!n) | |
3082 | return 0; | |
3083 | ||
3084 | for (t = (tree) n->value; t; t = TREE_CHAIN (t)) | |
3085 | if (same_type_p (TREE_VALUE (t), type)) | |
3086 | return 1; | |
3087 | ||
3088 | return 0; | |
9785e4b1 MM |
3089 | } |
3090 | ||
c20118a8 MM |
3091 | /* Walk through all the subobjects of TYPE (located at OFFSET). Call |
3092 | F for every subobject, passing it the type, offset, and table of | |
2003cd37 MM |
3093 | OFFSETS. If VBASES_P is one, then virtual non-primary bases should |
3094 | be traversed. | |
5cdba4ff MM |
3095 | |
3096 | If MAX_OFFSET is non-NULL, then subobjects with an offset greater | |
3097 | than MAX_OFFSET will not be walked. | |
3098 | ||
838dfd8a | 3099 | If F returns a nonzero value, the traversal ceases, and that value |
5cdba4ff | 3100 | is returned. Otherwise, returns zero. */ |
d77249e7 | 3101 | |
c20118a8 | 3102 | static int |
c8094d83 | 3103 | walk_subobject_offsets (tree type, |
0cbd7506 MS |
3104 | subobject_offset_fn f, |
3105 | tree offset, | |
3106 | splay_tree offsets, | |
3107 | tree max_offset, | |
3108 | int vbases_p) | |
5c24fba6 | 3109 | { |
c20118a8 | 3110 | int r = 0; |
ff944b49 | 3111 | tree type_binfo = NULL_TREE; |
c20118a8 | 3112 | |
5cdba4ff MM |
3113 | /* If this OFFSET is bigger than the MAX_OFFSET, then we should |
3114 | stop. */ | |
3115 | if (max_offset && INT_CST_LT (max_offset, offset)) | |
3116 | return 0; | |
3117 | ||
dbe91deb NS |
3118 | if (type == error_mark_node) |
3119 | return 0; | |
3120 | ||
c8094d83 | 3121 | if (!TYPE_P (type)) |
ff944b49 MM |
3122 | { |
3123 | if (abi_version_at_least (2)) | |
3124 | type_binfo = type; | |
3125 | type = BINFO_TYPE (type); | |
3126 | } | |
3127 | ||
c20118a8 | 3128 | if (CLASS_TYPE_P (type)) |
5c24fba6 | 3129 | { |
c20118a8 | 3130 | tree field; |
17bbb839 | 3131 | tree binfo; |
c20118a8 MM |
3132 | int i; |
3133 | ||
5ec1192e MM |
3134 | /* Avoid recursing into objects that are not interesting. */ |
3135 | if (!CLASSTYPE_CONTAINS_EMPTY_CLASS_P (type)) | |
3136 | return 0; | |
3137 | ||
c20118a8 MM |
3138 | /* Record the location of TYPE. */ |
3139 | r = (*f) (type, offset, offsets); | |
3140 | if (r) | |
3141 | return r; | |
3142 | ||
3143 | /* Iterate through the direct base classes of TYPE. */ | |
ff944b49 MM |
3144 | if (!type_binfo) |
3145 | type_binfo = TYPE_BINFO (type); | |
fa743e8c | 3146 | for (i = 0; BINFO_BASE_ITERATE (type_binfo, i, binfo); i++) |
c20118a8 | 3147 | { |
ff944b49 MM |
3148 | tree binfo_offset; |
3149 | ||
c8094d83 | 3150 | if (abi_version_at_least (2) |
809e3e7f | 3151 | && BINFO_VIRTUAL_P (binfo)) |
17bbb839 | 3152 | continue; |
5c24fba6 | 3153 | |
c8094d83 MS |
3154 | if (!vbases_p |
3155 | && BINFO_VIRTUAL_P (binfo) | |
9965d119 | 3156 | && !BINFO_PRIMARY_P (binfo)) |
c20118a8 MM |
3157 | continue; |
3158 | ||
ff944b49 MM |
3159 | if (!abi_version_at_least (2)) |
3160 | binfo_offset = size_binop (PLUS_EXPR, | |
3161 | offset, | |
3162 | BINFO_OFFSET (binfo)); | |
3163 | else | |
3164 | { | |
3165 | tree orig_binfo; | |
3166 | /* We cannot rely on BINFO_OFFSET being set for the base | |
3167 | class yet, but the offsets for direct non-virtual | |
3168 | bases can be calculated by going back to the TYPE. */ | |
604a3205 | 3169 | orig_binfo = BINFO_BASE_BINFO (TYPE_BINFO (type), i); |
c8094d83 | 3170 | binfo_offset = size_binop (PLUS_EXPR, |
ff944b49 MM |
3171 | offset, |
3172 | BINFO_OFFSET (orig_binfo)); | |
3173 | } | |
3174 | ||
3175 | r = walk_subobject_offsets (binfo, | |
c20118a8 | 3176 | f, |
ff944b49 | 3177 | binfo_offset, |
c20118a8 | 3178 | offsets, |
5cdba4ff | 3179 | max_offset, |
c8094d83 | 3180 | (abi_version_at_least (2) |
17bbb839 | 3181 | ? /*vbases_p=*/0 : vbases_p)); |
c20118a8 MM |
3182 | if (r) |
3183 | return r; | |
3184 | } | |
3185 | ||
58c42dc2 | 3186 | if (abi_version_at_least (2) && CLASSTYPE_VBASECLASSES (type)) |
17bbb839 | 3187 | { |
58c42dc2 | 3188 | unsigned ix; |
d4e6fecb | 3189 | VEC(tree,gc) *vbases; |
17bbb839 | 3190 | |
ff944b49 MM |
3191 | /* Iterate through the virtual base classes of TYPE. In G++ |
3192 | 3.2, we included virtual bases in the direct base class | |
3193 | loop above, which results in incorrect results; the | |
3194 | correct offsets for virtual bases are only known when | |
3195 | working with the most derived type. */ | |
3196 | if (vbases_p) | |
9ba5ff0f NS |
3197 | for (vbases = CLASSTYPE_VBASECLASSES (type), ix = 0; |
3198 | VEC_iterate (tree, vbases, ix, binfo); ix++) | |
ff944b49 | 3199 | { |
ff944b49 MM |
3200 | r = walk_subobject_offsets (binfo, |
3201 | f, | |
3202 | size_binop (PLUS_EXPR, | |
3203 | offset, | |
3204 | BINFO_OFFSET (binfo)), | |
3205 | offsets, | |
3206 | max_offset, | |
3207 | /*vbases_p=*/0); | |
3208 | if (r) | |
3209 | return r; | |
3210 | } | |
3211 | else | |
17bbb839 | 3212 | { |
ff944b49 MM |
3213 | /* We still have to walk the primary base, if it is |
3214 | virtual. (If it is non-virtual, then it was walked | |
3215 | above.) */ | |
58c42dc2 | 3216 | tree vbase = get_primary_binfo (type_binfo); |
c8094d83 | 3217 | |
809e3e7f | 3218 | if (vbase && BINFO_VIRTUAL_P (vbase) |
fc6633e0 NS |
3219 | && BINFO_PRIMARY_P (vbase) |
3220 | && BINFO_INHERITANCE_CHAIN (vbase) == type_binfo) | |
ff944b49 | 3221 | { |
c8094d83 | 3222 | r = (walk_subobject_offsets |
dbbf88d1 NS |
3223 | (vbase, f, offset, |
3224 | offsets, max_offset, /*vbases_p=*/0)); | |
3225 | if (r) | |
3226 | return r; | |
ff944b49 | 3227 | } |
17bbb839 MM |
3228 | } |
3229 | } | |
3230 | ||
c20118a8 MM |
3231 | /* Iterate through the fields of TYPE. */ |
3232 | for (field = TYPE_FIELDS (type); field; field = TREE_CHAIN (field)) | |
17bbb839 | 3233 | if (TREE_CODE (field) == FIELD_DECL && !DECL_ARTIFICIAL (field)) |
c20118a8 | 3234 | { |
956d9305 MM |
3235 | tree field_offset; |
3236 | ||
3237 | if (abi_version_at_least (2)) | |
3238 | field_offset = byte_position (field); | |
3239 | else | |
3240 | /* In G++ 3.2, DECL_FIELD_OFFSET was used. */ | |
3241 | field_offset = DECL_FIELD_OFFSET (field); | |
3242 | ||
c20118a8 MM |
3243 | r = walk_subobject_offsets (TREE_TYPE (field), |
3244 | f, | |
3245 | size_binop (PLUS_EXPR, | |
3246 | offset, | |
956d9305 | 3247 | field_offset), |
c20118a8 | 3248 | offsets, |
5cdba4ff | 3249 | max_offset, |
c20118a8 MM |
3250 | /*vbases_p=*/1); |
3251 | if (r) | |
3252 | return r; | |
3253 | } | |
5c24fba6 | 3254 | } |
c20118a8 MM |
3255 | else if (TREE_CODE (type) == ARRAY_TYPE) |
3256 | { | |
5ec1192e | 3257 | tree element_type = strip_array_types (type); |
c20118a8 MM |
3258 | tree domain = TYPE_DOMAIN (type); |
3259 | tree index; | |
5c24fba6 | 3260 | |
5ec1192e MM |
3261 | /* Avoid recursing into objects that are not interesting. */ |
3262 | if (!CLASS_TYPE_P (element_type) | |
3263 | || !CLASSTYPE_CONTAINS_EMPTY_CLASS_P (element_type)) | |
3264 | return 0; | |
3265 | ||
c20118a8 | 3266 | /* Step through each of the elements in the array. */ |
17bbb839 MM |
3267 | for (index = size_zero_node; |
3268 | /* G++ 3.2 had an off-by-one error here. */ | |
c8094d83 | 3269 | (abi_version_at_least (2) |
17bbb839 MM |
3270 | ? !INT_CST_LT (TYPE_MAX_VALUE (domain), index) |
3271 | : INT_CST_LT (index, TYPE_MAX_VALUE (domain))); | |
c20118a8 MM |
3272 | index = size_binop (PLUS_EXPR, index, size_one_node)) |
3273 | { | |
3274 | r = walk_subobject_offsets (TREE_TYPE (type), | |
3275 | f, | |
3276 | offset, | |
3277 | offsets, | |
5cdba4ff | 3278 | max_offset, |
c20118a8 MM |
3279 | /*vbases_p=*/1); |
3280 | if (r) | |
3281 | return r; | |
c8094d83 | 3282 | offset = size_binop (PLUS_EXPR, offset, |
c20118a8 | 3283 | TYPE_SIZE_UNIT (TREE_TYPE (type))); |
5cdba4ff MM |
3284 | /* If this new OFFSET is bigger than the MAX_OFFSET, then |
3285 | there's no point in iterating through the remaining | |
3286 | elements of the array. */ | |
3287 | if (max_offset && INT_CST_LT (max_offset, offset)) | |
3288 | break; | |
c20118a8 MM |
3289 | } |
3290 | } | |
3291 | ||
3292 | return 0; | |
3293 | } | |
3294 | ||
c0572427 MM |
3295 | /* Record all of the empty subobjects of TYPE (either a type or a |
3296 | binfo). If IS_DATA_MEMBER is true, then a non-static data member | |
c5a35c3c MM |
3297 | is being placed at OFFSET; otherwise, it is a base class that is |
3298 | being placed at OFFSET. */ | |
c20118a8 MM |
3299 | |
3300 | static void | |
c8094d83 | 3301 | record_subobject_offsets (tree type, |
0cbd7506 MS |
3302 | tree offset, |
3303 | splay_tree offsets, | |
c5a35c3c | 3304 | bool is_data_member) |
c20118a8 | 3305 | { |
c5a35c3c | 3306 | tree max_offset; |
c0572427 MM |
3307 | /* If recording subobjects for a non-static data member or a |
3308 | non-empty base class , we do not need to record offsets beyond | |
3309 | the size of the biggest empty class. Additional data members | |
3310 | will go at the end of the class. Additional base classes will go | |
3311 | either at offset zero (if empty, in which case they cannot | |
3312 | overlap with offsets past the size of the biggest empty class) or | |
3313 | at the end of the class. | |
3314 | ||
3315 | However, if we are placing an empty base class, then we must record | |
c5a35c3c MM |
3316 | all offsets, as either the empty class is at offset zero (where |
3317 | other empty classes might later be placed) or at the end of the | |
3318 | class (where other objects might then be placed, so other empty | |
3319 | subobjects might later overlap). */ | |
c0572427 MM |
3320 | if (is_data_member |
3321 | || !is_empty_class (BINFO_TYPE (type))) | |
c5a35c3c MM |
3322 | max_offset = sizeof_biggest_empty_class; |
3323 | else | |
3324 | max_offset = NULL_TREE; | |
c20118a8 | 3325 | walk_subobject_offsets (type, record_subobject_offset, offset, |
c5a35c3c | 3326 | offsets, max_offset, is_data_member); |
5c24fba6 MM |
3327 | } |
3328 | ||
838dfd8a KH |
3329 | /* Returns nonzero if any of the empty subobjects of TYPE (located at |
3330 | OFFSET) conflict with entries in OFFSETS. If VBASES_P is nonzero, | |
c20118a8 | 3331 | virtual bases of TYPE are examined. */ |
9785e4b1 MM |
3332 | |
3333 | static int | |
94edc4ab | 3334 | layout_conflict_p (tree type, |
0cbd7506 MS |
3335 | tree offset, |
3336 | splay_tree offsets, | |
3337 | int vbases_p) | |
9785e4b1 | 3338 | { |
5cdba4ff MM |
3339 | splay_tree_node max_node; |
3340 | ||
3341 | /* Get the node in OFFSETS that indicates the maximum offset where | |
3342 | an empty subobject is located. */ | |
3343 | max_node = splay_tree_max (offsets); | |
3344 | /* If there aren't any empty subobjects, then there's no point in | |
3345 | performing this check. */ | |
3346 | if (!max_node) | |
3347 | return 0; | |
3348 | ||
c20118a8 | 3349 | return walk_subobject_offsets (type, check_subobject_offset, offset, |
5cdba4ff MM |
3350 | offsets, (tree) (max_node->key), |
3351 | vbases_p); | |
9785e4b1 MM |
3352 | } |
3353 | ||
5c24fba6 MM |
3354 | /* DECL is a FIELD_DECL corresponding either to a base subobject of a |
3355 | non-static data member of the type indicated by RLI. BINFO is the | |
c20118a8 | 3356 | binfo corresponding to the base subobject, OFFSETS maps offsets to |
17bbb839 MM |
3357 | types already located at those offsets. This function determines |
3358 | the position of the DECL. */ | |
5c24fba6 MM |
3359 | |
3360 | static void | |
c8094d83 MS |
3361 | layout_nonempty_base_or_field (record_layout_info rli, |
3362 | tree decl, | |
3363 | tree binfo, | |
17bbb839 | 3364 | splay_tree offsets) |
5c24fba6 | 3365 | { |
c20118a8 | 3366 | tree offset = NULL_TREE; |
17bbb839 MM |
3367 | bool field_p; |
3368 | tree type; | |
c8094d83 | 3369 | |
17bbb839 MM |
3370 | if (binfo) |
3371 | { | |
3372 | /* For the purposes of determining layout conflicts, we want to | |
3373 | use the class type of BINFO; TREE_TYPE (DECL) will be the | |
3374 | CLASSTYPE_AS_BASE version, which does not contain entries for | |
3375 | zero-sized bases. */ | |
3376 | type = TREE_TYPE (binfo); | |
3377 | field_p = false; | |
3378 | } | |
3379 | else | |
3380 | { | |
3381 | type = TREE_TYPE (decl); | |
3382 | field_p = true; | |
3383 | } | |
c20118a8 | 3384 | |
5c24fba6 MM |
3385 | /* Try to place the field. It may take more than one try if we have |
3386 | a hard time placing the field without putting two objects of the | |
3387 | same type at the same address. */ | |
3388 | while (1) | |
3389 | { | |
defd0dea | 3390 | struct record_layout_info_s old_rli = *rli; |
5c24fba6 | 3391 | |
770ae6cc RK |
3392 | /* Place this field. */ |
3393 | place_field (rli, decl); | |
da3d4dfa | 3394 | offset = byte_position (decl); |
1e2e9f54 | 3395 | |
5c24fba6 MM |
3396 | /* We have to check to see whether or not there is already |
3397 | something of the same type at the offset we're about to use. | |
1e2e9f54 | 3398 | For example, consider: |
c8094d83 | 3399 | |
1e2e9f54 MM |
3400 | struct S {}; |
3401 | struct T : public S { int i; }; | |
3402 | struct U : public S, public T {}; | |
c8094d83 | 3403 | |
5c24fba6 MM |
3404 | Here, we put S at offset zero in U. Then, we can't put T at |
3405 | offset zero -- its S component would be at the same address | |
3406 | as the S we already allocated. So, we have to skip ahead. | |
3407 | Since all data members, including those whose type is an | |
838dfd8a | 3408 | empty class, have nonzero size, any overlap can happen only |
5c24fba6 MM |
3409 | with a direct or indirect base-class -- it can't happen with |
3410 | a data member. */ | |
1e2e9f54 MM |
3411 | /* In a union, overlap is permitted; all members are placed at |
3412 | offset zero. */ | |
3413 | if (TREE_CODE (rli->t) == UNION_TYPE) | |
3414 | break; | |
7ba539c6 MM |
3415 | /* G++ 3.2 did not check for overlaps when placing a non-empty |
3416 | virtual base. */ | |
809e3e7f | 3417 | if (!abi_version_at_least (2) && binfo && BINFO_VIRTUAL_P (binfo)) |
7ba539c6 | 3418 | break; |
c8094d83 | 3419 | if (layout_conflict_p (field_p ? type : binfo, offset, |
ff944b49 | 3420 | offsets, field_p)) |
5c24fba6 | 3421 | { |
5c24fba6 MM |
3422 | /* Strip off the size allocated to this field. That puts us |
3423 | at the first place we could have put the field with | |
3424 | proper alignment. */ | |
770ae6cc RK |
3425 | *rli = old_rli; |
3426 | ||
c20118a8 | 3427 | /* Bump up by the alignment required for the type. */ |
770ae6cc | 3428 | rli->bitpos |
c8094d83 MS |
3429 | = size_binop (PLUS_EXPR, rli->bitpos, |
3430 | bitsize_int (binfo | |
c20118a8 MM |
3431 | ? CLASSTYPE_ALIGN (type) |
3432 | : TYPE_ALIGN (type))); | |
770ae6cc | 3433 | normalize_rli (rli); |
5c24fba6 MM |
3434 | } |
3435 | else | |
3436 | /* There was no conflict. We're done laying out this field. */ | |
3437 | break; | |
3438 | } | |
c20118a8 | 3439 | |
623fe76a | 3440 | /* Now that we know where it will be placed, update its |
c20118a8 MM |
3441 | BINFO_OFFSET. */ |
3442 | if (binfo && CLASS_TYPE_P (BINFO_TYPE (binfo))) | |
90024bdc | 3443 | /* Indirect virtual bases may have a nonzero BINFO_OFFSET at |
17bbb839 MM |
3444 | this point because their BINFO_OFFSET is copied from another |
3445 | hierarchy. Therefore, we may not need to add the entire | |
3446 | OFFSET. */ | |
c8094d83 | 3447 | propagate_binfo_offsets (binfo, |
17bbb839 | 3448 | size_diffop (convert (ssizetype, offset), |
c8094d83 | 3449 | convert (ssizetype, |
dbbf88d1 | 3450 | BINFO_OFFSET (binfo)))); |
5c24fba6 MM |
3451 | } |
3452 | ||
90024bdc | 3453 | /* Returns true if TYPE is empty and OFFSET is nonzero. */ |
7ba539c6 MM |
3454 | |
3455 | static int | |
3456 | empty_base_at_nonzero_offset_p (tree type, | |
3457 | tree offset, | |
3458 | splay_tree offsets ATTRIBUTE_UNUSED) | |
3459 | { | |
3460 | return is_empty_class (type) && !integer_zerop (offset); | |
3461 | } | |
3462 | ||
9785e4b1 | 3463 | /* Layout the empty base BINFO. EOC indicates the byte currently just |
ec386958 | 3464 | past the end of the class, and should be correctly aligned for a |
c20118a8 | 3465 | class of the type indicated by BINFO; OFFSETS gives the offsets of |
623fe76a | 3466 | the empty bases allocated so far. T is the most derived |
838dfd8a | 3467 | type. Return nonzero iff we added it at the end. */ |
9785e4b1 | 3468 | |
06d9f09f | 3469 | static bool |
dbbf88d1 | 3470 | layout_empty_base (tree binfo, tree eoc, splay_tree offsets) |
9785e4b1 | 3471 | { |
ec386958 | 3472 | tree alignment; |
9785e4b1 | 3473 | tree basetype = BINFO_TYPE (binfo); |
06d9f09f | 3474 | bool atend = false; |
956d9305 | 3475 | |
9785e4b1 | 3476 | /* This routine should only be used for empty classes. */ |
50bc768d | 3477 | gcc_assert (is_empty_class (basetype)); |
1b50716d | 3478 | alignment = ssize_int (CLASSTYPE_ALIGN_UNIT (basetype)); |
9785e4b1 | 3479 | |
3075b327 NS |
3480 | if (!integer_zerop (BINFO_OFFSET (binfo))) |
3481 | { | |
3482 | if (abi_version_at_least (2)) | |
3483 | propagate_binfo_offsets | |
3484 | (binfo, size_diffop (size_zero_node, BINFO_OFFSET (binfo))); | |
3485 | else if (warn_abi) | |
d4ee4d25 | 3486 | warning (0, "offset of empty base %qT may not be ABI-compliant and may" |
3075b327 NS |
3487 | "change in a future version of GCC", |
3488 | BINFO_TYPE (binfo)); | |
3489 | } | |
c8094d83 | 3490 | |
9785e4b1 MM |
3491 | /* This is an empty base class. We first try to put it at offset |
3492 | zero. */ | |
ff944b49 | 3493 | if (layout_conflict_p (binfo, |
c20118a8 | 3494 | BINFO_OFFSET (binfo), |
c8094d83 | 3495 | offsets, |
c20118a8 | 3496 | /*vbases_p=*/0)) |
9785e4b1 MM |
3497 | { |
3498 | /* That didn't work. Now, we move forward from the next | |
3499 | available spot in the class. */ | |
06d9f09f | 3500 | atend = true; |
dbbf88d1 | 3501 | propagate_binfo_offsets (binfo, convert (ssizetype, eoc)); |
c8094d83 | 3502 | while (1) |
9785e4b1 | 3503 | { |
ff944b49 | 3504 | if (!layout_conflict_p (binfo, |
c8094d83 | 3505 | BINFO_OFFSET (binfo), |
c20118a8 MM |
3506 | offsets, |
3507 | /*vbases_p=*/0)) | |
9785e4b1 MM |
3508 | /* We finally found a spot where there's no overlap. */ |
3509 | break; | |
3510 | ||
3511 | /* There's overlap here, too. Bump along to the next spot. */ | |
dbbf88d1 | 3512 | propagate_binfo_offsets (binfo, alignment); |
9785e4b1 MM |
3513 | } |
3514 | } | |
06d9f09f | 3515 | return atend; |
9785e4b1 MM |
3516 | } |
3517 | ||
78dcd41a | 3518 | /* Layout the base given by BINFO in the class indicated by RLI. |
58731fd1 | 3519 | *BASE_ALIGN is a running maximum of the alignments of |
17bbb839 MM |
3520 | any base class. OFFSETS gives the location of empty base |
3521 | subobjects. T is the most derived type. Return nonzero if the new | |
3522 | object cannot be nearly-empty. A new FIELD_DECL is inserted at | |
c8094d83 | 3523 | *NEXT_FIELD, unless BINFO is for an empty base class. |
5c24fba6 | 3524 | |
17bbb839 MM |
3525 | Returns the location at which the next field should be inserted. */ |
3526 | ||
3527 | static tree * | |
58731fd1 | 3528 | build_base_field (record_layout_info rli, tree binfo, |
17bbb839 | 3529 | splay_tree offsets, tree *next_field) |
d77249e7 | 3530 | { |
17bbb839 | 3531 | tree t = rli->t; |
d77249e7 | 3532 | tree basetype = BINFO_TYPE (binfo); |
d77249e7 | 3533 | |
d0f062fb | 3534 | if (!COMPLETE_TYPE_P (basetype)) |
d77249e7 MM |
3535 | /* This error is now reported in xref_tag, thus giving better |
3536 | location information. */ | |
17bbb839 | 3537 | return next_field; |
c8094d83 | 3538 | |
17bbb839 MM |
3539 | /* Place the base class. */ |
3540 | if (!is_empty_class (basetype)) | |
5c24fba6 | 3541 | { |
17bbb839 MM |
3542 | tree decl; |
3543 | ||
5c24fba6 MM |
3544 | /* The containing class is non-empty because it has a non-empty |
3545 | base class. */ | |
58731fd1 | 3546 | CLASSTYPE_EMPTY_P (t) = 0; |
c8094d83 | 3547 | |
17bbb839 MM |
3548 | /* Create the FIELD_DECL. */ |
3549 | decl = build_decl (FIELD_DECL, NULL_TREE, CLASSTYPE_AS_BASE (basetype)); | |
3550 | DECL_ARTIFICIAL (decl) = 1; | |
78e0d62b | 3551 | DECL_IGNORED_P (decl) = 1; |
17bbb839 MM |
3552 | DECL_FIELD_CONTEXT (decl) = t; |
3553 | DECL_SIZE (decl) = CLASSTYPE_SIZE (basetype); | |
3554 | DECL_SIZE_UNIT (decl) = CLASSTYPE_SIZE_UNIT (basetype); | |
3555 | DECL_ALIGN (decl) = CLASSTYPE_ALIGN (basetype); | |
3556 | DECL_USER_ALIGN (decl) = CLASSTYPE_USER_ALIGN (basetype); | |
550f100c | 3557 | DECL_MODE (decl) = TYPE_MODE (basetype); |
642124c6 | 3558 | DECL_FIELD_IS_BASE (decl) = 1; |
0f3a8219 | 3559 | |
5c24fba6 MM |
3560 | /* Try to place the field. It may take more than one try if we |
3561 | have a hard time placing the field without putting two | |
3562 | objects of the same type at the same address. */ | |
17bbb839 MM |
3563 | layout_nonempty_base_or_field (rli, decl, binfo, offsets); |
3564 | /* Add the new FIELD_DECL to the list of fields for T. */ | |
3565 | TREE_CHAIN (decl) = *next_field; | |
3566 | *next_field = decl; | |
3567 | next_field = &TREE_CHAIN (decl); | |
5c24fba6 MM |
3568 | } |
3569 | else | |
ec386958 | 3570 | { |
17bbb839 | 3571 | tree eoc; |
7ba539c6 | 3572 | bool atend; |
ec386958 MM |
3573 | |
3574 | /* On some platforms (ARM), even empty classes will not be | |
3575 | byte-aligned. */ | |
17bbb839 MM |
3576 | eoc = round_up (rli_size_unit_so_far (rli), |
3577 | CLASSTYPE_ALIGN_UNIT (basetype)); | |
dbbf88d1 | 3578 | atend = layout_empty_base (binfo, eoc, offsets); |
7ba539c6 MM |
3579 | /* A nearly-empty class "has no proper base class that is empty, |
3580 | not morally virtual, and at an offset other than zero." */ | |
809e3e7f | 3581 | if (!BINFO_VIRTUAL_P (binfo) && CLASSTYPE_NEARLY_EMPTY_P (t)) |
7ba539c6 MM |
3582 | { |
3583 | if (atend) | |
3584 | CLASSTYPE_NEARLY_EMPTY_P (t) = 0; | |
c5a35c3c | 3585 | /* The check above (used in G++ 3.2) is insufficient because |
7ba539c6 | 3586 | an empty class placed at offset zero might itself have an |
90024bdc | 3587 | empty base at a nonzero offset. */ |
c8094d83 | 3588 | else if (walk_subobject_offsets (basetype, |
7ba539c6 MM |
3589 | empty_base_at_nonzero_offset_p, |
3590 | size_zero_node, | |
3591 | /*offsets=*/NULL, | |
3592 | /*max_offset=*/NULL_TREE, | |
3593 | /*vbases_p=*/true)) | |
3594 | { | |
3595 | if (abi_version_at_least (2)) | |
3596 | CLASSTYPE_NEARLY_EMPTY_P (t) = 0; | |
3597 | else if (warn_abi) | |
d4ee4d25 | 3598 | warning (0, "class %qT will be considered nearly empty in a " |
7ba539c6 MM |
3599 | "future version of GCC", t); |
3600 | } | |
3601 | } | |
c8094d83 | 3602 | |
17bbb839 MM |
3603 | /* We do not create a FIELD_DECL for empty base classes because |
3604 | it might overlap some other field. We want to be able to | |
3605 | create CONSTRUCTORs for the class by iterating over the | |
3606 | FIELD_DECLs, and the back end does not handle overlapping | |
3607 | FIELD_DECLs. */ | |
58731fd1 MM |
3608 | |
3609 | /* An empty virtual base causes a class to be non-empty | |
3610 | -- but in that case we do not need to clear CLASSTYPE_EMPTY_P | |
3611 | here because that was already done when the virtual table | |
3612 | pointer was created. */ | |
ec386958 | 3613 | } |
5c24fba6 | 3614 | |
5c24fba6 | 3615 | /* Record the offsets of BINFO and its base subobjects. */ |
ff944b49 | 3616 | record_subobject_offsets (binfo, |
c20118a8 | 3617 | BINFO_OFFSET (binfo), |
c8094d83 | 3618 | offsets, |
c5a35c3c | 3619 | /*is_data_member=*/false); |
17bbb839 MM |
3620 | |
3621 | return next_field; | |
d77249e7 MM |
3622 | } |
3623 | ||
c20118a8 | 3624 | /* Layout all of the non-virtual base classes. Record empty |
17bbb839 MM |
3625 | subobjects in OFFSETS. T is the most derived type. Return nonzero |
3626 | if the type cannot be nearly empty. The fields created | |
3627 | corresponding to the base classes will be inserted at | |
3628 | *NEXT_FIELD. */ | |
607cf131 | 3629 | |
17bbb839 | 3630 | static void |
58731fd1 | 3631 | build_base_fields (record_layout_info rli, |
17bbb839 | 3632 | splay_tree offsets, tree *next_field) |
607cf131 MM |
3633 | { |
3634 | /* Chain to hold all the new FIELD_DECLs which stand in for base class | |
3635 | subobjects. */ | |
17bbb839 | 3636 | tree t = rli->t; |
604a3205 | 3637 | int n_baseclasses = BINFO_N_BASE_BINFOS (TYPE_BINFO (t)); |
5c24fba6 | 3638 | int i; |
607cf131 | 3639 | |
3461fba7 | 3640 | /* The primary base class is always allocated first. */ |
17bbb839 MM |
3641 | if (CLASSTYPE_HAS_PRIMARY_BASE_P (t)) |
3642 | next_field = build_base_field (rli, CLASSTYPE_PRIMARY_BINFO (t), | |
58731fd1 | 3643 | offsets, next_field); |
d77249e7 MM |
3644 | |
3645 | /* Now allocate the rest of the bases. */ | |
607cf131 MM |
3646 | for (i = 0; i < n_baseclasses; ++i) |
3647 | { | |
d77249e7 | 3648 | tree base_binfo; |
607cf131 | 3649 | |
604a3205 | 3650 | base_binfo = BINFO_BASE_BINFO (TYPE_BINFO (t), i); |
911a71a7 | 3651 | |
3461fba7 NS |
3652 | /* The primary base was already allocated above, so we don't |
3653 | need to allocate it again here. */ | |
17bbb839 | 3654 | if (base_binfo == CLASSTYPE_PRIMARY_BINFO (t)) |
607cf131 MM |
3655 | continue; |
3656 | ||
dbbf88d1 NS |
3657 | /* Virtual bases are added at the end (a primary virtual base |
3658 | will have already been added). */ | |
809e3e7f | 3659 | if (BINFO_VIRTUAL_P (base_binfo)) |
607cf131 MM |
3660 | continue; |
3661 | ||
58731fd1 | 3662 | next_field = build_base_field (rli, base_binfo, |
17bbb839 | 3663 | offsets, next_field); |
607cf131 | 3664 | } |
607cf131 MM |
3665 | } |
3666 | ||
58010b57 MM |
3667 | /* Go through the TYPE_METHODS of T issuing any appropriate |
3668 | diagnostics, figuring out which methods override which other | |
3ef397c1 | 3669 | methods, and so forth. */ |
58010b57 MM |
3670 | |
3671 | static void | |
94edc4ab | 3672 | check_methods (tree t) |
58010b57 MM |
3673 | { |
3674 | tree x; | |
58010b57 MM |
3675 | |
3676 | for (x = TYPE_METHODS (t); x; x = TREE_CHAIN (x)) | |
3677 | { | |
58010b57 | 3678 | check_for_override (x, t); |
fee7654e | 3679 | if (DECL_PURE_VIRTUAL_P (x) && ! DECL_VINDEX (x)) |
dee15844 | 3680 | error ("initializer specified for non-virtual method %q+D", x); |
58010b57 MM |
3681 | /* The name of the field is the original field name |
3682 | Save this in auxiliary field for later overloading. */ | |
3683 | if (DECL_VINDEX (x)) | |
3684 | { | |
3ef397c1 | 3685 | TYPE_POLYMORPHIC_P (t) = 1; |
fee7654e | 3686 | if (DECL_PURE_VIRTUAL_P (x)) |
d4e6fecb | 3687 | VEC_safe_push (tree, gc, CLASSTYPE_PURE_VIRTUALS (t), x); |
58010b57 | 3688 | } |
9f4faeae MM |
3689 | /* All user-declared destructors are non-trivial. */ |
3690 | if (DECL_DESTRUCTOR_P (x)) | |
3691 | TYPE_HAS_NONTRIVIAL_DESTRUCTOR (t) = 1; | |
58010b57 | 3692 | } |
58010b57 MM |
3693 | } |
3694 | ||
db9b2174 MM |
3695 | /* FN is a constructor or destructor. Clone the declaration to create |
3696 | a specialized in-charge or not-in-charge version, as indicated by | |
3697 | NAME. */ | |
3698 | ||
3699 | static tree | |
94edc4ab | 3700 | build_clone (tree fn, tree name) |
db9b2174 MM |
3701 | { |
3702 | tree parms; | |
3703 | tree clone; | |
3704 | ||
3705 | /* Copy the function. */ | |
3706 | clone = copy_decl (fn); | |
3707 | /* Remember where this function came from. */ | |
3708 | DECL_CLONED_FUNCTION (clone) = fn; | |
5daf7c0a | 3709 | DECL_ABSTRACT_ORIGIN (clone) = fn; |
db9b2174 MM |
3710 | /* Reset the function name. */ |
3711 | DECL_NAME (clone) = name; | |
71cb9286 | 3712 | SET_DECL_ASSEMBLER_NAME (clone, NULL_TREE); |
db9b2174 MM |
3713 | /* There's no pending inline data for this function. */ |
3714 | DECL_PENDING_INLINE_INFO (clone) = NULL; | |
3715 | DECL_PENDING_INLINE_P (clone) = 0; | |
3716 | /* And it hasn't yet been deferred. */ | |
3717 | DECL_DEFERRED_FN (clone) = 0; | |
3718 | ||
298d6f60 MM |
3719 | /* The base-class destructor is not virtual. */ |
3720 | if (name == base_dtor_identifier) | |
3721 | { | |
3722 | DECL_VIRTUAL_P (clone) = 0; | |
3723 | if (TREE_CODE (clone) != TEMPLATE_DECL) | |
3724 | DECL_VINDEX (clone) = NULL_TREE; | |
3725 | } | |
3726 | ||
4e7512c9 | 3727 | /* If there was an in-charge parameter, drop it from the function |
db9b2174 MM |
3728 | type. */ |
3729 | if (DECL_HAS_IN_CHARGE_PARM_P (clone)) | |
3730 | { | |
3731 | tree basetype; | |
3732 | tree parmtypes; | |
3733 | tree exceptions; | |
3734 | ||
3735 | exceptions = TYPE_RAISES_EXCEPTIONS (TREE_TYPE (clone)); | |
3736 | basetype = TYPE_METHOD_BASETYPE (TREE_TYPE (clone)); | |
3737 | parmtypes = TYPE_ARG_TYPES (TREE_TYPE (clone)); | |
3738 | /* Skip the `this' parameter. */ | |
3739 | parmtypes = TREE_CHAIN (parmtypes); | |
3740 | /* Skip the in-charge parameter. */ | |
3741 | parmtypes = TREE_CHAIN (parmtypes); | |
e0fff4b3 JM |
3742 | /* And the VTT parm, in a complete [cd]tor. */ |
3743 | if (DECL_HAS_VTT_PARM_P (fn) | |
3744 | && ! DECL_NEEDS_VTT_PARM_P (clone)) | |
3745 | parmtypes = TREE_CHAIN (parmtypes); | |
3ec6bad3 MM |
3746 | /* If this is subobject constructor or destructor, add the vtt |
3747 | parameter. */ | |
c8094d83 | 3748 | TREE_TYPE (clone) |
43dc123f MM |
3749 | = build_method_type_directly (basetype, |
3750 | TREE_TYPE (TREE_TYPE (clone)), | |
3751 | parmtypes); | |
db9b2174 MM |
3752 | if (exceptions) |
3753 | TREE_TYPE (clone) = build_exception_variant (TREE_TYPE (clone), | |
3754 | exceptions); | |
c8094d83 | 3755 | TREE_TYPE (clone) |
e9525111 MM |
3756 | = cp_build_type_attribute_variant (TREE_TYPE (clone), |
3757 | TYPE_ATTRIBUTES (TREE_TYPE (fn))); | |
db9b2174 MM |
3758 | } |
3759 | ||
e0fff4b3 JM |
3760 | /* Copy the function parameters. But, DECL_ARGUMENTS on a TEMPLATE_DECL |
3761 | aren't function parameters; those are the template parameters. */ | |
db9b2174 MM |
3762 | if (TREE_CODE (clone) != TEMPLATE_DECL) |
3763 | { | |
3764 | DECL_ARGUMENTS (clone) = copy_list (DECL_ARGUMENTS (clone)); | |
3765 | /* Remove the in-charge parameter. */ | |
3766 | if (DECL_HAS_IN_CHARGE_PARM_P (clone)) | |
3767 | { | |
3768 | TREE_CHAIN (DECL_ARGUMENTS (clone)) | |
3769 | = TREE_CHAIN (TREE_CHAIN (DECL_ARGUMENTS (clone))); | |
3770 | DECL_HAS_IN_CHARGE_PARM_P (clone) = 0; | |
3771 | } | |
e0fff4b3 JM |
3772 | /* And the VTT parm, in a complete [cd]tor. */ |
3773 | if (DECL_HAS_VTT_PARM_P (fn)) | |
3ec6bad3 | 3774 | { |
e0fff4b3 JM |
3775 | if (DECL_NEEDS_VTT_PARM_P (clone)) |
3776 | DECL_HAS_VTT_PARM_P (clone) = 1; | |
3777 | else | |
3778 | { | |
3779 | TREE_CHAIN (DECL_ARGUMENTS (clone)) | |
3780 | = TREE_CHAIN (TREE_CHAIN (DECL_ARGUMENTS (clone))); | |
3781 | DECL_HAS_VTT_PARM_P (clone) = 0; | |
3782 | } | |
3ec6bad3 MM |
3783 | } |
3784 | ||
db9b2174 MM |
3785 | for (parms = DECL_ARGUMENTS (clone); parms; parms = TREE_CHAIN (parms)) |
3786 | { | |
3787 | DECL_CONTEXT (parms) = clone; | |
63e1b1c4 | 3788 | cxx_dup_lang_specific_decl (parms); |
db9b2174 MM |
3789 | } |
3790 | } | |
3791 | ||
db9b2174 | 3792 | /* Create the RTL for this function. */ |
19e7881c | 3793 | SET_DECL_RTL (clone, NULL_RTX); |
0e6df31e | 3794 | rest_of_decl_compilation (clone, /*top_level=*/1, at_eof); |
c8094d83 | 3795 | |
db9b2174 MM |
3796 | /* Make it easy to find the CLONE given the FN. */ |
3797 | TREE_CHAIN (clone) = TREE_CHAIN (fn); | |
3798 | TREE_CHAIN (fn) = clone; | |
3799 | ||
3800 | /* If this is a template, handle the DECL_TEMPLATE_RESULT as well. */ | |
3801 | if (TREE_CODE (clone) == TEMPLATE_DECL) | |
3802 | { | |
3803 | tree result; | |
3804 | ||
c8094d83 | 3805 | DECL_TEMPLATE_RESULT (clone) |
db9b2174 MM |
3806 | = build_clone (DECL_TEMPLATE_RESULT (clone), name); |
3807 | result = DECL_TEMPLATE_RESULT (clone); | |
3808 | DECL_TEMPLATE_INFO (result) = copy_node (DECL_TEMPLATE_INFO (result)); | |
3809 | DECL_TI_TEMPLATE (result) = clone; | |
3810 | } | |
5e2f4cd2 MM |
3811 | else if (pch_file) |
3812 | note_decl_for_pch (clone); | |
db9b2174 MM |
3813 | |
3814 | return clone; | |
3815 | } | |
3816 | ||
3817 | /* Produce declarations for all appropriate clones of FN. If | |
838dfd8a | 3818 | UPDATE_METHOD_VEC_P is nonzero, the clones are added to the |
db9b2174 MM |
3819 | CLASTYPE_METHOD_VEC as well. */ |
3820 | ||
3821 | void | |
94edc4ab | 3822 | clone_function_decl (tree fn, int update_method_vec_p) |
db9b2174 MM |
3823 | { |
3824 | tree clone; | |
3825 | ||
c00996a3 | 3826 | /* Avoid inappropriate cloning. */ |
1f84ec23 MM |
3827 | if (TREE_CHAIN (fn) |
3828 | && DECL_CLONED_FUNCTION (TREE_CHAIN (fn))) | |
c00996a3 JM |
3829 | return; |
3830 | ||
298d6f60 | 3831 | if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (fn)) |
db9b2174 | 3832 | { |
298d6f60 MM |
3833 | /* For each constructor, we need two variants: an in-charge version |
3834 | and a not-in-charge version. */ | |
db9b2174 MM |
3835 | clone = build_clone (fn, complete_ctor_identifier); |
3836 | if (update_method_vec_p) | |
b2a9b208 | 3837 | add_method (DECL_CONTEXT (clone), clone, NULL_TREE); |
db9b2174 MM |
3838 | clone = build_clone (fn, base_ctor_identifier); |
3839 | if (update_method_vec_p) | |
b2a9b208 | 3840 | add_method (DECL_CONTEXT (clone), clone, NULL_TREE); |
db9b2174 MM |
3841 | } |
3842 | else | |
298d6f60 | 3843 | { |
50bc768d | 3844 | gcc_assert (DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P (fn)); |
298d6f60 | 3845 | |
3ec6bad3 | 3846 | /* For each destructor, we need three variants: an in-charge |
298d6f60 | 3847 | version, a not-in-charge version, and an in-charge deleting |
4e7512c9 MM |
3848 | version. We clone the deleting version first because that |
3849 | means it will go second on the TYPE_METHODS list -- and that | |
3850 | corresponds to the correct layout order in the virtual | |
c8094d83 | 3851 | function table. |
52682a1b | 3852 | |
0cbd7506 | 3853 | For a non-virtual destructor, we do not build a deleting |
52682a1b MM |
3854 | destructor. */ |
3855 | if (DECL_VIRTUAL_P (fn)) | |
3856 | { | |
3857 | clone = build_clone (fn, deleting_dtor_identifier); | |
3858 | if (update_method_vec_p) | |
b2a9b208 | 3859 | add_method (DECL_CONTEXT (clone), clone, NULL_TREE); |
52682a1b | 3860 | } |
4e7512c9 | 3861 | clone = build_clone (fn, complete_dtor_identifier); |
298d6f60 | 3862 | if (update_method_vec_p) |
b2a9b208 | 3863 | add_method (DECL_CONTEXT (clone), clone, NULL_TREE); |
298d6f60 MM |
3864 | clone = build_clone (fn, base_dtor_identifier); |
3865 | if (update_method_vec_p) | |
b2a9b208 | 3866 | add_method (DECL_CONTEXT (clone), clone, NULL_TREE); |
298d6f60 | 3867 | } |
5daf7c0a JM |
3868 | |
3869 | /* Note that this is an abstract function that is never emitted. */ | |
3870 | DECL_ABSTRACT (fn) = 1; | |
db9b2174 MM |
3871 | } |
3872 | ||
5f6eeeb3 NS |
3873 | /* DECL is an in charge constructor, which is being defined. This will |
3874 | have had an in class declaration, from whence clones were | |
3875 | declared. An out-of-class definition can specify additional default | |
3876 | arguments. As it is the clones that are involved in overload | |
3877 | resolution, we must propagate the information from the DECL to its | |
00a17e31 | 3878 | clones. */ |
5f6eeeb3 NS |
3879 | |
3880 | void | |
94edc4ab | 3881 | adjust_clone_args (tree decl) |
5f6eeeb3 NS |
3882 | { |
3883 | tree clone; | |
c8094d83 | 3884 | |
5f6eeeb3 NS |
3885 | for (clone = TREE_CHAIN (decl); clone && DECL_CLONED_FUNCTION (clone); |
3886 | clone = TREE_CHAIN (clone)) | |
3887 | { | |
3888 | tree orig_clone_parms = TYPE_ARG_TYPES (TREE_TYPE (clone)); | |
3889 | tree orig_decl_parms = TYPE_ARG_TYPES (TREE_TYPE (decl)); | |
3890 | tree decl_parms, clone_parms; | |
3891 | ||
3892 | clone_parms = orig_clone_parms; | |
c8094d83 | 3893 | |
00a17e31 | 3894 | /* Skip the 'this' parameter. */ |
5f6eeeb3 NS |
3895 | orig_clone_parms = TREE_CHAIN (orig_clone_parms); |
3896 | orig_decl_parms = TREE_CHAIN (orig_decl_parms); | |
3897 | ||
3898 | if (DECL_HAS_IN_CHARGE_PARM_P (decl)) | |
3899 | orig_decl_parms = TREE_CHAIN (orig_decl_parms); | |
3900 | if (DECL_HAS_VTT_PARM_P (decl)) | |
3901 | orig_decl_parms = TREE_CHAIN (orig_decl_parms); | |
c8094d83 | 3902 | |
5f6eeeb3 NS |
3903 | clone_parms = orig_clone_parms; |
3904 | if (DECL_HAS_VTT_PARM_P (clone)) | |
3905 | clone_parms = TREE_CHAIN (clone_parms); | |
c8094d83 | 3906 | |
5f6eeeb3 NS |
3907 | for (decl_parms = orig_decl_parms; decl_parms; |
3908 | decl_parms = TREE_CHAIN (decl_parms), | |
3909 | clone_parms = TREE_CHAIN (clone_parms)) | |
3910 | { | |
50bc768d NS |
3911 | gcc_assert (same_type_p (TREE_TYPE (decl_parms), |
3912 | TREE_TYPE (clone_parms))); | |
c8094d83 | 3913 | |
5f6eeeb3 NS |
3914 | if (TREE_PURPOSE (decl_parms) && !TREE_PURPOSE (clone_parms)) |
3915 | { | |
3916 | /* A default parameter has been added. Adjust the | |
00a17e31 | 3917 | clone's parameters. */ |
5f6eeeb3 NS |
3918 | tree exceptions = TYPE_RAISES_EXCEPTIONS (TREE_TYPE (clone)); |
3919 | tree basetype = TYPE_METHOD_BASETYPE (TREE_TYPE (clone)); | |
3920 | tree type; | |
3921 | ||
3922 | clone_parms = orig_decl_parms; | |
3923 | ||
3924 | if (DECL_HAS_VTT_PARM_P (clone)) | |
3925 | { | |
3926 | clone_parms = tree_cons (TREE_PURPOSE (orig_clone_parms), | |
3927 | TREE_VALUE (orig_clone_parms), | |
3928 | clone_parms); | |
3929 | TREE_TYPE (clone_parms) = TREE_TYPE (orig_clone_parms); | |
3930 | } | |
43dc123f MM |
3931 | type = build_method_type_directly (basetype, |
3932 | TREE_TYPE (TREE_TYPE (clone)), | |
3933 | clone_parms); | |
5f6eeeb3 NS |
3934 | if (exceptions) |
3935 | type = build_exception_variant (type, exceptions); | |
3936 | TREE_TYPE (clone) = type; | |
c8094d83 | 3937 | |
5f6eeeb3 NS |
3938 | clone_parms = NULL_TREE; |
3939 | break; | |
3940 | } | |
3941 | } | |
50bc768d | 3942 | gcc_assert (!clone_parms); |
5f6eeeb3 NS |
3943 | } |
3944 | } | |
3945 | ||
db9b2174 MM |
3946 | /* For each of the constructors and destructors in T, create an |
3947 | in-charge and not-in-charge variant. */ | |
3948 | ||
3949 | static void | |
94edc4ab | 3950 | clone_constructors_and_destructors (tree t) |
db9b2174 MM |
3951 | { |
3952 | tree fns; | |
3953 | ||
db9b2174 MM |
3954 | /* If for some reason we don't have a CLASSTYPE_METHOD_VEC, we bail |
3955 | out now. */ | |
3956 | if (!CLASSTYPE_METHOD_VEC (t)) | |
3957 | return; | |
3958 | ||
db9b2174 MM |
3959 | for (fns = CLASSTYPE_CONSTRUCTORS (t); fns; fns = OVL_NEXT (fns)) |
3960 | clone_function_decl (OVL_CURRENT (fns), /*update_method_vec_p=*/1); | |
298d6f60 MM |
3961 | for (fns = CLASSTYPE_DESTRUCTORS (t); fns; fns = OVL_NEXT (fns)) |
3962 | clone_function_decl (OVL_CURRENT (fns), /*update_method_vec_p=*/1); | |
db9b2174 MM |
3963 | } |
3964 | ||
58010b57 MM |
3965 | /* Remove all zero-width bit-fields from T. */ |
3966 | ||
3967 | static void | |
94edc4ab | 3968 | remove_zero_width_bit_fields (tree t) |
58010b57 MM |
3969 | { |
3970 | tree *fieldsp; | |
3971 | ||
c8094d83 | 3972 | fieldsp = &TYPE_FIELDS (t); |
58010b57 MM |
3973 | while (*fieldsp) |
3974 | { | |
3975 | if (TREE_CODE (*fieldsp) == FIELD_DECL | |
c8094d83 | 3976 | && DECL_C_BIT_FIELD (*fieldsp) |
58010b57 MM |
3977 | && DECL_INITIAL (*fieldsp)) |
3978 | *fieldsp = TREE_CHAIN (*fieldsp); | |
3979 | else | |
3980 | fieldsp = &TREE_CHAIN (*fieldsp); | |
3981 | } | |
3982 | } | |
3983 | ||
dbc957f1 MM |
3984 | /* Returns TRUE iff we need a cookie when dynamically allocating an |
3985 | array whose elements have the indicated class TYPE. */ | |
3986 | ||
3987 | static bool | |
94edc4ab | 3988 | type_requires_array_cookie (tree type) |
dbc957f1 MM |
3989 | { |
3990 | tree fns; | |
18fee3ee | 3991 | bool has_two_argument_delete_p = false; |
dbc957f1 | 3992 | |
50bc768d | 3993 | gcc_assert (CLASS_TYPE_P (type)); |
dbc957f1 MM |
3994 | |
3995 | /* If there's a non-trivial destructor, we need a cookie. In order | |
3996 | to iterate through the array calling the destructor for each | |
3997 | element, we'll have to know how many elements there are. */ | |
3998 | if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type)) | |
3999 | return true; | |
4000 | ||
4001 | /* If the usual deallocation function is a two-argument whose second | |
4002 | argument is of type `size_t', then we have to pass the size of | |
4003 | the array to the deallocation function, so we will need to store | |
4004 | a cookie. */ | |
c8094d83 | 4005 | fns = lookup_fnfields (TYPE_BINFO (type), |
dbc957f1 MM |
4006 | ansi_opname (VEC_DELETE_EXPR), |
4007 | /*protect=*/0); | |
4008 | /* If there are no `operator []' members, or the lookup is | |
4009 | ambiguous, then we don't need a cookie. */ | |
4010 | if (!fns || fns == error_mark_node) | |
4011 | return false; | |
4012 | /* Loop through all of the functions. */ | |
50ad9642 | 4013 | for (fns = BASELINK_FUNCTIONS (fns); fns; fns = OVL_NEXT (fns)) |
dbc957f1 MM |
4014 | { |
4015 | tree fn; | |
4016 | tree second_parm; | |
4017 | ||
4018 | /* Select the current function. */ | |
4019 | fn = OVL_CURRENT (fns); | |
4020 | /* See if this function is a one-argument delete function. If | |
4021 | it is, then it will be the usual deallocation function. */ | |
4022 | second_parm = TREE_CHAIN (TYPE_ARG_TYPES (TREE_TYPE (fn))); | |
4023 | if (second_parm == void_list_node) | |
4024 | return false; | |
4025 | /* Otherwise, if we have a two-argument function and the second | |
4026 | argument is `size_t', it will be the usual deallocation | |
4027 | function -- unless there is one-argument function, too. */ | |
4028 | if (TREE_CHAIN (second_parm) == void_list_node | |
4029 | && same_type_p (TREE_VALUE (second_parm), sizetype)) | |
4030 | has_two_argument_delete_p = true; | |
4031 | } | |
4032 | ||
4033 | return has_two_argument_delete_p; | |
4034 | } | |
4035 | ||
607cf131 MM |
4036 | /* Check the validity of the bases and members declared in T. Add any |
4037 | implicitly-generated functions (like copy-constructors and | |
4038 | assignment operators). Compute various flag bits (like | |
4039 | CLASSTYPE_NON_POD_T) for T. This routine works purely at the C++ | |
4040 | level: i.e., independently of the ABI in use. */ | |
4041 | ||
4042 | static void | |
58731fd1 | 4043 | check_bases_and_members (tree t) |
607cf131 | 4044 | { |
607cf131 MM |
4045 | /* Nonzero if the implicitly generated copy constructor should take |
4046 | a non-const reference argument. */ | |
4047 | int cant_have_const_ctor; | |
78dcd41a | 4048 | /* Nonzero if the implicitly generated assignment operator |
607cf131 MM |
4049 | should take a non-const reference argument. */ |
4050 | int no_const_asn_ref; | |
4051 | tree access_decls; | |
4052 | ||
4053 | /* By default, we use const reference arguments and generate default | |
4054 | constructors. */ | |
607cf131 MM |
4055 | cant_have_const_ctor = 0; |
4056 | no_const_asn_ref = 0; | |
4057 | ||
00a17e31 | 4058 | /* Check all the base-classes. */ |
e5e459bf | 4059 | check_bases (t, &cant_have_const_ctor, |
607cf131 MM |
4060 | &no_const_asn_ref); |
4061 | ||
9f4faeae MM |
4062 | /* Check all the method declarations. */ |
4063 | check_methods (t); | |
4064 | ||
4065 | /* Check all the data member declarations. We cannot call | |
4066 | check_field_decls until we have called check_bases check_methods, | |
4067 | as check_field_decls depends on TYPE_HAS_NONTRIVIAL_DESTRUCTOR | |
4068 | being set appropriately. */ | |
58731fd1 | 4069 | check_field_decls (t, &access_decls, |
607cf131 MM |
4070 | &cant_have_const_ctor, |
4071 | &no_const_asn_ref); | |
4072 | ||
bbd15aac MM |
4073 | /* A nearly-empty class has to be vptr-containing; a nearly empty |
4074 | class contains just a vptr. */ | |
4075 | if (!TYPE_CONTAINS_VPTR_P (t)) | |
f9c528ea MM |
4076 | CLASSTYPE_NEARLY_EMPTY_P (t) = 0; |
4077 | ||
607cf131 MM |
4078 | /* Do some bookkeeping that will guide the generation of implicitly |
4079 | declared member functions. */ | |
4080 | TYPE_HAS_COMPLEX_INIT_REF (t) | |
5775a06a | 4081 | |= (TYPE_HAS_INIT_REF (t) || TYPE_CONTAINS_VPTR_P (t)); |
607cf131 | 4082 | TYPE_NEEDS_CONSTRUCTING (t) |
5775a06a NS |
4083 | |= (TYPE_HAS_CONSTRUCTOR (t) || TYPE_CONTAINS_VPTR_P (t)); |
4084 | CLASSTYPE_NON_AGGREGATE (t) | |
4085 | |= (TYPE_HAS_CONSTRUCTOR (t) || TYPE_POLYMORPHIC_P (t)); | |
607cf131 | 4086 | CLASSTYPE_NON_POD_P (t) |
c8094d83 | 4087 | |= (CLASSTYPE_NON_AGGREGATE (t) |
9f4faeae | 4088 | || TYPE_HAS_NONTRIVIAL_DESTRUCTOR (t) |
607cf131 | 4089 | || TYPE_HAS_ASSIGN_REF (t)); |
607cf131 | 4090 | TYPE_HAS_COMPLEX_ASSIGN_REF (t) |
0830ae44 | 4091 | |= TYPE_HAS_ASSIGN_REF (t) || TYPE_CONTAINS_VPTR_P (t); |
607cf131 | 4092 | |
03fd3f84 | 4093 | /* Synthesize any needed methods. */ |
e5e459bf | 4094 | add_implicitly_declared_members (t, |
607cf131 MM |
4095 | cant_have_const_ctor, |
4096 | no_const_asn_ref); | |
4097 | ||
db9b2174 MM |
4098 | /* Create the in-charge and not-in-charge variants of constructors |
4099 | and destructors. */ | |
4100 | clone_constructors_and_destructors (t); | |
4101 | ||
aa52c1ff JM |
4102 | /* Process the using-declarations. */ |
4103 | for (; access_decls; access_decls = TREE_CHAIN (access_decls)) | |
4104 | handle_using_decl (TREE_VALUE (access_decls), t); | |
4105 | ||
607cf131 MM |
4106 | /* Build and sort the CLASSTYPE_METHOD_VEC. */ |
4107 | finish_struct_methods (t); | |
dbc957f1 MM |
4108 | |
4109 | /* Figure out whether or not we will need a cookie when dynamically | |
4110 | allocating an array of this type. */ | |
e2500fed | 4111 | TYPE_LANG_SPECIFIC (t)->u.c.vec_new_uses_cookie |
dbc957f1 | 4112 | = type_requires_array_cookie (t); |
607cf131 MM |
4113 | } |
4114 | ||
3ef397c1 | 4115 | /* If T needs a pointer to its virtual function table, set TYPE_VFIELD |
5c24fba6 MM |
4116 | accordingly. If a new vfield was created (because T doesn't have a |
4117 | primary base class), then the newly created field is returned. It | |
c35cce41 | 4118 | is not added to the TYPE_FIELDS list; it is the caller's |
e6858a84 NS |
4119 | responsibility to do that. Accumulate declared virtual functions |
4120 | on VIRTUALS_P. */ | |
3ef397c1 | 4121 | |
5c24fba6 | 4122 | static tree |
94edc4ab | 4123 | create_vtable_ptr (tree t, tree* virtuals_p) |
3ef397c1 MM |
4124 | { |
4125 | tree fn; | |
4126 | ||
e6858a84 | 4127 | /* Collect the virtual functions declared in T. */ |
3ef397c1 | 4128 | for (fn = TYPE_METHODS (t); fn; fn = TREE_CHAIN (fn)) |
e6858a84 NS |
4129 | if (DECL_VINDEX (fn) && !DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P (fn) |
4130 | && TREE_CODE (DECL_VINDEX (fn)) != INTEGER_CST) | |
4131 | { | |
4132 | tree new_virtual = make_node (TREE_LIST); | |
c8094d83 | 4133 | |
e6858a84 NS |
4134 | BV_FN (new_virtual) = fn; |
4135 | BV_DELTA (new_virtual) = integer_zero_node; | |
d1f05f93 | 4136 | BV_VCALL_INDEX (new_virtual) = NULL_TREE; |
3ef397c1 | 4137 | |
e6858a84 NS |
4138 | TREE_CHAIN (new_virtual) = *virtuals_p; |
4139 | *virtuals_p = new_virtual; | |
4140 | } | |
c8094d83 | 4141 | |
da3d4dfa MM |
4142 | /* If we couldn't find an appropriate base class, create a new field |
4143 | here. Even if there weren't any new virtual functions, we might need a | |
bbd15aac MM |
4144 | new virtual function table if we're supposed to include vptrs in |
4145 | all classes that need them. */ | |
e6858a84 | 4146 | if (!TYPE_VFIELD (t) && (*virtuals_p || TYPE_CONTAINS_VPTR_P (t))) |
3ef397c1 MM |
4147 | { |
4148 | /* We build this decl with vtbl_ptr_type_node, which is a | |
4149 | `vtable_entry_type*'. It might seem more precise to use | |
a692ad2e | 4150 | `vtable_entry_type (*)[N]' where N is the number of virtual |
3ef397c1 MM |
4151 | functions. However, that would require the vtable pointer in |
4152 | base classes to have a different type than the vtable pointer | |
4153 | in derived classes. We could make that happen, but that | |
4154 | still wouldn't solve all the problems. In particular, the | |
4155 | type-based alias analysis code would decide that assignments | |
4156 | to the base class vtable pointer can't alias assignments to | |
4157 | the derived class vtable pointer, since they have different | |
4639c5c6 | 4158 | types. Thus, in a derived class destructor, where the base |
3ef397c1 | 4159 | class constructor was inlined, we could generate bad code for |
c8094d83 | 4160 | setting up the vtable pointer. |
3ef397c1 | 4161 | |
0cbd7506 | 4162 | Therefore, we use one type for all vtable pointers. We still |
3ef397c1 MM |
4163 | use a type-correct type; it's just doesn't indicate the array |
4164 | bounds. That's better than using `void*' or some such; it's | |
4165 | cleaner, and it let's the alias analysis code know that these | |
4166 | stores cannot alias stores to void*! */ | |
0abe00c5 NS |
4167 | tree field; |
4168 | ||
4169 | field = build_decl (FIELD_DECL, get_vfield_name (t), vtbl_ptr_type_node); | |
0abe00c5 NS |
4170 | DECL_VIRTUAL_P (field) = 1; |
4171 | DECL_ARTIFICIAL (field) = 1; | |
4172 | DECL_FIELD_CONTEXT (field) = t; | |
4173 | DECL_FCONTEXT (field) = t; | |
c8094d83 | 4174 | |
0abe00c5 | 4175 | TYPE_VFIELD (t) = field; |
c8094d83 | 4176 | |
0abe00c5 | 4177 | /* This class is non-empty. */ |
58731fd1 | 4178 | CLASSTYPE_EMPTY_P (t) = 0; |
3ef397c1 | 4179 | |
0abe00c5 | 4180 | return field; |
3ef397c1 | 4181 | } |
5c24fba6 MM |
4182 | |
4183 | return NULL_TREE; | |
3ef397c1 MM |
4184 | } |
4185 | ||
2ef16140 MM |
4186 | /* Fixup the inline function given by INFO now that the class is |
4187 | complete. */ | |
08b962b0 | 4188 | |
2ef16140 | 4189 | static void |
94edc4ab | 4190 | fixup_pending_inline (tree fn) |
2ef16140 | 4191 | { |
0e5921e8 | 4192 | if (DECL_PENDING_INLINE_INFO (fn)) |
2ef16140 | 4193 | { |
0e5921e8 | 4194 | tree args = DECL_ARGUMENTS (fn); |
2ef16140 MM |
4195 | while (args) |
4196 | { | |
4197 | DECL_CONTEXT (args) = fn; | |
4198 | args = TREE_CHAIN (args); | |
4199 | } | |
4200 | } | |
4201 | } | |
08b962b0 | 4202 | |
2ef16140 MM |
4203 | /* Fixup the inline methods and friends in TYPE now that TYPE is |
4204 | complete. */ | |
08b962b0 | 4205 | |
2ef16140 | 4206 | static void |
94edc4ab | 4207 | fixup_inline_methods (tree type) |
08b962b0 | 4208 | { |
2ef16140 | 4209 | tree method = TYPE_METHODS (type); |
d4e6fecb | 4210 | VEC(tree,gc) *friends; |
585b44d3 | 4211 | unsigned ix; |
08b962b0 | 4212 | |
2ef16140 | 4213 | if (method && TREE_CODE (method) == TREE_VEC) |
08b962b0 | 4214 | { |
2ef16140 MM |
4215 | if (TREE_VEC_ELT (method, 1)) |
4216 | method = TREE_VEC_ELT (method, 1); | |
4217 | else if (TREE_VEC_ELT (method, 0)) | |
4218 | method = TREE_VEC_ELT (method, 0); | |
08b962b0 | 4219 | else |
2ef16140 | 4220 | method = TREE_VEC_ELT (method, 2); |
08b962b0 MM |
4221 | } |
4222 | ||
2ef16140 MM |
4223 | /* Do inline member functions. */ |
4224 | for (; method; method = TREE_CHAIN (method)) | |
0e5921e8 | 4225 | fixup_pending_inline (method); |
08b962b0 | 4226 | |
2ef16140 | 4227 | /* Do friends. */ |
585b44d3 NS |
4228 | for (friends = CLASSTYPE_INLINE_FRIENDS (type), ix = 0; |
4229 | VEC_iterate (tree, friends, ix, method); ix++) | |
4230 | fixup_pending_inline (method); | |
4231 | CLASSTYPE_INLINE_FRIENDS (type) = NULL; | |
2ef16140 | 4232 | } |
08b962b0 | 4233 | |
9d4c0187 MM |
4234 | /* Add OFFSET to all base types of BINFO which is a base in the |
4235 | hierarchy dominated by T. | |
80fd5f48 | 4236 | |
911a71a7 | 4237 | OFFSET, which is a type offset, is number of bytes. */ |
80fd5f48 MM |
4238 | |
4239 | static void | |
dbbf88d1 | 4240 | propagate_binfo_offsets (tree binfo, tree offset) |
80fd5f48 | 4241 | { |
911a71a7 MM |
4242 | int i; |
4243 | tree primary_binfo; | |
fa743e8c | 4244 | tree base_binfo; |
80fd5f48 | 4245 | |
911a71a7 MM |
4246 | /* Update BINFO's offset. */ |
4247 | BINFO_OFFSET (binfo) | |
c8094d83 | 4248 | = convert (sizetype, |
911a71a7 MM |
4249 | size_binop (PLUS_EXPR, |
4250 | convert (ssizetype, BINFO_OFFSET (binfo)), | |
4251 | offset)); | |
80fd5f48 | 4252 | |
911a71a7 MM |
4253 | /* Find the primary base class. */ |
4254 | primary_binfo = get_primary_binfo (binfo); | |
4255 | ||
fc6633e0 | 4256 | if (primary_binfo && BINFO_INHERITANCE_CHAIN (primary_binfo) == binfo) |
090ad434 | 4257 | propagate_binfo_offsets (primary_binfo, offset); |
c8094d83 | 4258 | |
911a71a7 MM |
4259 | /* Scan all of the bases, pushing the BINFO_OFFSET adjust |
4260 | downwards. */ | |
fa743e8c | 4261 | for (i = 0; BINFO_BASE_ITERATE (binfo, i, base_binfo); ++i) |
80fd5f48 | 4262 | { |
090ad434 NS |
4263 | /* Don't do the primary base twice. */ |
4264 | if (base_binfo == primary_binfo) | |
4265 | continue; | |
911a71a7 | 4266 | |
090ad434 | 4267 | if (BINFO_VIRTUAL_P (base_binfo)) |
911a71a7 MM |
4268 | continue; |
4269 | ||
dbbf88d1 | 4270 | propagate_binfo_offsets (base_binfo, offset); |
911a71a7 | 4271 | } |
9d4c0187 MM |
4272 | } |
4273 | ||
17bbb839 | 4274 | /* Set BINFO_OFFSET for all of the virtual bases for RLI->T. Update |
c20118a8 MM |
4275 | TYPE_ALIGN and TYPE_SIZE for T. OFFSETS gives the location of |
4276 | empty subobjects of T. */ | |
80fd5f48 | 4277 | |
d2c5305b | 4278 | static void |
17bbb839 | 4279 | layout_virtual_bases (record_layout_info rli, splay_tree offsets) |
80fd5f48 | 4280 | { |
dbbf88d1 | 4281 | tree vbase; |
17bbb839 | 4282 | tree t = rli->t; |
eca7f13c | 4283 | bool first_vbase = true; |
17bbb839 | 4284 | tree *next_field; |
9785e4b1 | 4285 | |
604a3205 | 4286 | if (BINFO_N_BASE_BINFOS (TYPE_BINFO (t)) == 0) |
9785e4b1 MM |
4287 | return; |
4288 | ||
17bbb839 MM |
4289 | if (!abi_version_at_least(2)) |
4290 | { | |
4291 | /* In G++ 3.2, we incorrectly rounded the size before laying out | |
4292 | the virtual bases. */ | |
4293 | finish_record_layout (rli, /*free_p=*/false); | |
9785e4b1 | 4294 | #ifdef STRUCTURE_SIZE_BOUNDARY |
17bbb839 MM |
4295 | /* Packed structures don't need to have minimum size. */ |
4296 | if (! TYPE_PACKED (t)) | |
fc555370 | 4297 | TYPE_ALIGN (t) = MAX (TYPE_ALIGN (t), (unsigned) STRUCTURE_SIZE_BOUNDARY); |
9785e4b1 | 4298 | #endif |
17bbb839 MM |
4299 | rli->offset = TYPE_SIZE_UNIT (t); |
4300 | rli->bitpos = bitsize_zero_node; | |
4301 | rli->record_align = TYPE_ALIGN (t); | |
4302 | } | |
80fd5f48 | 4303 | |
17bbb839 MM |
4304 | /* Find the last field. The artificial fields created for virtual |
4305 | bases will go after the last extant field to date. */ | |
4306 | next_field = &TYPE_FIELDS (t); | |
4307 | while (*next_field) | |
4308 | next_field = &TREE_CHAIN (*next_field); | |
80fd5f48 | 4309 | |
9d4c0187 | 4310 | /* Go through the virtual bases, allocating space for each virtual |
3461fba7 NS |
4311 | base that is not already a primary base class. These are |
4312 | allocated in inheritance graph order. */ | |
dbbf88d1 | 4313 | for (vbase = TYPE_BINFO (t); vbase; vbase = TREE_CHAIN (vbase)) |
c35cce41 | 4314 | { |
809e3e7f | 4315 | if (!BINFO_VIRTUAL_P (vbase)) |
1f84ec23 | 4316 | continue; |
eca7f13c | 4317 | |
9965d119 | 4318 | if (!BINFO_PRIMARY_P (vbase)) |
c35cce41 | 4319 | { |
17bbb839 MM |
4320 | tree basetype = TREE_TYPE (vbase); |
4321 | ||
c35cce41 MM |
4322 | /* This virtual base is not a primary base of any class in the |
4323 | hierarchy, so we have to add space for it. */ | |
58731fd1 | 4324 | next_field = build_base_field (rli, vbase, |
17bbb839 | 4325 | offsets, next_field); |
9785e4b1 | 4326 | |
eca7f13c MM |
4327 | /* If the first virtual base might have been placed at a |
4328 | lower address, had we started from CLASSTYPE_SIZE, rather | |
4329 | than TYPE_SIZE, issue a warning. There can be both false | |
4330 | positives and false negatives from this warning in rare | |
4331 | cases; to deal with all the possibilities would probably | |
4332 | require performing both layout algorithms and comparing | |
4333 | the results which is not particularly tractable. */ | |
4334 | if (warn_abi | |
4335 | && first_vbase | |
c8094d83 | 4336 | && (tree_int_cst_lt |
17bbb839 MM |
4337 | (size_binop (CEIL_DIV_EXPR, |
4338 | round_up (CLASSTYPE_SIZE (t), | |
4339 | CLASSTYPE_ALIGN (basetype)), | |
4340 | bitsize_unit_node), | |
4341 | BINFO_OFFSET (vbase)))) | |
d4ee4d25 | 4342 | warning (0, "offset of virtual base %qT is not ABI-compliant and " |
0cbd7506 | 4343 | "may change in a future version of GCC", |
eca7f13c MM |
4344 | basetype); |
4345 | ||
eca7f13c | 4346 | first_vbase = false; |
c35cce41 MM |
4347 | } |
4348 | } | |
80fd5f48 MM |
4349 | } |
4350 | ||
ba9a991f MM |
4351 | /* Returns the offset of the byte just past the end of the base class |
4352 | BINFO. */ | |
4353 | ||
4354 | static tree | |
4355 | end_of_base (tree binfo) | |
4356 | { | |
4357 | tree size; | |
4358 | ||
4359 | if (is_empty_class (BINFO_TYPE (binfo))) | |
4360 | /* An empty class has zero CLASSTYPE_SIZE_UNIT, but we need to | |
4361 | allocate some space for it. It cannot have virtual bases, so | |
4362 | TYPE_SIZE_UNIT is fine. */ | |
4363 | size = TYPE_SIZE_UNIT (BINFO_TYPE (binfo)); | |
4364 | else | |
4365 | size = CLASSTYPE_SIZE_UNIT (BINFO_TYPE (binfo)); | |
4366 | ||
4367 | return size_binop (PLUS_EXPR, BINFO_OFFSET (binfo), size); | |
4368 | } | |
4369 | ||
9785e4b1 MM |
4370 | /* Returns the offset of the byte just past the end of the base class |
4371 | with the highest offset in T. If INCLUDE_VIRTUALS_P is zero, then | |
4372 | only non-virtual bases are included. */ | |
80fd5f48 | 4373 | |
17bbb839 | 4374 | static tree |
94edc4ab | 4375 | end_of_class (tree t, int include_virtuals_p) |
80fd5f48 | 4376 | { |
17bbb839 | 4377 | tree result = size_zero_node; |
d4e6fecb | 4378 | VEC(tree,gc) *vbases; |
ba9a991f | 4379 | tree binfo; |
9ba5ff0f | 4380 | tree base_binfo; |
ba9a991f | 4381 | tree offset; |
9785e4b1 | 4382 | int i; |
80fd5f48 | 4383 | |
fa743e8c NS |
4384 | for (binfo = TYPE_BINFO (t), i = 0; |
4385 | BINFO_BASE_ITERATE (binfo, i, base_binfo); ++i) | |
9785e4b1 | 4386 | { |
9785e4b1 | 4387 | if (!include_virtuals_p |
fc6633e0 NS |
4388 | && BINFO_VIRTUAL_P (base_binfo) |
4389 | && (!BINFO_PRIMARY_P (base_binfo) | |
4390 | || BINFO_INHERITANCE_CHAIN (base_binfo) != TYPE_BINFO (t))) | |
9785e4b1 | 4391 | continue; |
80fd5f48 | 4392 | |
fa743e8c | 4393 | offset = end_of_base (base_binfo); |
17bbb839 MM |
4394 | if (INT_CST_LT_UNSIGNED (result, offset)) |
4395 | result = offset; | |
9785e4b1 | 4396 | } |
80fd5f48 | 4397 | |
ba9a991f MM |
4398 | /* G++ 3.2 did not check indirect virtual bases. */ |
4399 | if (abi_version_at_least (2) && include_virtuals_p) | |
9ba5ff0f NS |
4400 | for (vbases = CLASSTYPE_VBASECLASSES (t), i = 0; |
4401 | VEC_iterate (tree, vbases, i, base_binfo); i++) | |
ba9a991f | 4402 | { |
9ba5ff0f | 4403 | offset = end_of_base (base_binfo); |
ba9a991f MM |
4404 | if (INT_CST_LT_UNSIGNED (result, offset)) |
4405 | result = offset; | |
4406 | } | |
4407 | ||
9785e4b1 | 4408 | return result; |
80fd5f48 MM |
4409 | } |
4410 | ||
17bbb839 | 4411 | /* Warn about bases of T that are inaccessible because they are |
78b45a24 MM |
4412 | ambiguous. For example: |
4413 | ||
4414 | struct S {}; | |
4415 | struct T : public S {}; | |
4416 | struct U : public S, public T {}; | |
4417 | ||
4418 | Here, `(S*) new U' is not allowed because there are two `S' | |
4419 | subobjects of U. */ | |
4420 | ||
4421 | static void | |
94edc4ab | 4422 | warn_about_ambiguous_bases (tree t) |
78b45a24 MM |
4423 | { |
4424 | int i; | |
d4e6fecb | 4425 | VEC(tree,gc) *vbases; |
17bbb839 | 4426 | tree basetype; |
58c42dc2 | 4427 | tree binfo; |
fa743e8c | 4428 | tree base_binfo; |
78b45a24 | 4429 | |
18e4be85 NS |
4430 | /* If there are no repeated bases, nothing can be ambiguous. */ |
4431 | if (!CLASSTYPE_REPEATED_BASE_P (t)) | |
4432 | return; | |
c8094d83 | 4433 | |
17bbb839 | 4434 | /* Check direct bases. */ |
fa743e8c NS |
4435 | for (binfo = TYPE_BINFO (t), i = 0; |
4436 | BINFO_BASE_ITERATE (binfo, i, base_binfo); ++i) | |
78b45a24 | 4437 | { |
fa743e8c | 4438 | basetype = BINFO_TYPE (base_binfo); |
78b45a24 | 4439 | |
18e4be85 | 4440 | if (!lookup_base (t, basetype, ba_unique | ba_quiet, NULL)) |
d4ee4d25 | 4441 | warning (0, "direct base %qT inaccessible in %qT due to ambiguity", |
17bbb839 | 4442 | basetype, t); |
78b45a24 | 4443 | } |
17bbb839 MM |
4444 | |
4445 | /* Check for ambiguous virtual bases. */ | |
4446 | if (extra_warnings) | |
9ba5ff0f NS |
4447 | for (vbases = CLASSTYPE_VBASECLASSES (t), i = 0; |
4448 | VEC_iterate (tree, vbases, i, binfo); i++) | |
17bbb839 | 4449 | { |
58c42dc2 | 4450 | basetype = BINFO_TYPE (binfo); |
c8094d83 | 4451 | |
18e4be85 | 4452 | if (!lookup_base (t, basetype, ba_unique | ba_quiet, NULL)) |
d4ee4d25 | 4453 | warning (0, "virtual base %qT inaccessible in %qT due to ambiguity", |
17bbb839 MM |
4454 | basetype, t); |
4455 | } | |
78b45a24 MM |
4456 | } |
4457 | ||
c20118a8 MM |
4458 | /* Compare two INTEGER_CSTs K1 and K2. */ |
4459 | ||
4460 | static int | |
94edc4ab | 4461 | splay_tree_compare_integer_csts (splay_tree_key k1, splay_tree_key k2) |
c20118a8 MM |
4462 | { |
4463 | return tree_int_cst_compare ((tree) k1, (tree) k2); | |
4464 | } | |
4465 | ||
17bbb839 MM |
4466 | /* Increase the size indicated in RLI to account for empty classes |
4467 | that are "off the end" of the class. */ | |
4468 | ||
4469 | static void | |
4470 | include_empty_classes (record_layout_info rli) | |
4471 | { | |
4472 | tree eoc; | |
e3ccdd50 | 4473 | tree rli_size; |
17bbb839 MM |
4474 | |
4475 | /* It might be the case that we grew the class to allocate a | |
4476 | zero-sized base class. That won't be reflected in RLI, yet, | |
4477 | because we are willing to overlay multiple bases at the same | |
4478 | offset. However, now we need to make sure that RLI is big enough | |
4479 | to reflect the entire class. */ | |
c8094d83 | 4480 | eoc = end_of_class (rli->t, |
17bbb839 | 4481 | CLASSTYPE_AS_BASE (rli->t) != NULL_TREE); |
e3ccdd50 MM |
4482 | rli_size = rli_size_unit_so_far (rli); |
4483 | if (TREE_CODE (rli_size) == INTEGER_CST | |
4484 | && INT_CST_LT_UNSIGNED (rli_size, eoc)) | |
17bbb839 | 4485 | { |
43fe31f6 MM |
4486 | if (!abi_version_at_least (2)) |
4487 | /* In version 1 of the ABI, the size of a class that ends with | |
4488 | a bitfield was not rounded up to a whole multiple of a | |
4489 | byte. Because rli_size_unit_so_far returns only the number | |
4490 | of fully allocated bytes, any extra bits were not included | |
4491 | in the size. */ | |
4492 | rli->bitpos = round_down (rli->bitpos, BITS_PER_UNIT); | |
4493 | else | |
4494 | /* The size should have been rounded to a whole byte. */ | |
50bc768d NS |
4495 | gcc_assert (tree_int_cst_equal |
4496 | (rli->bitpos, round_down (rli->bitpos, BITS_PER_UNIT))); | |
c8094d83 MS |
4497 | rli->bitpos |
4498 | = size_binop (PLUS_EXPR, | |
e3ccdd50 MM |
4499 | rli->bitpos, |
4500 | size_binop (MULT_EXPR, | |
4501 | convert (bitsizetype, | |
4502 | size_binop (MINUS_EXPR, | |
4503 | eoc, rli_size)), | |
4504 | bitsize_int (BITS_PER_UNIT))); | |
4505 | normalize_rli (rli); | |
17bbb839 MM |
4506 | } |
4507 | } | |
4508 | ||
2ef16140 MM |
4509 | /* Calculate the TYPE_SIZE, TYPE_ALIGN, etc for T. Calculate |
4510 | BINFO_OFFSETs for all of the base-classes. Position the vtable | |
00a17e31 | 4511 | pointer. Accumulate declared virtual functions on VIRTUALS_P. */ |
607cf131 | 4512 | |
2ef16140 | 4513 | static void |
e93ee644 | 4514 | layout_class_type (tree t, tree *virtuals_p) |
2ef16140 | 4515 | { |
5c24fba6 MM |
4516 | tree non_static_data_members; |
4517 | tree field; | |
4518 | tree vptr; | |
4519 | record_layout_info rli; | |
c20118a8 MM |
4520 | /* Maps offsets (represented as INTEGER_CSTs) to a TREE_LIST of |
4521 | types that appear at that offset. */ | |
4522 | splay_tree empty_base_offsets; | |
eca7f13c MM |
4523 | /* True if the last field layed out was a bit-field. */ |
4524 | bool last_field_was_bitfield = false; | |
17bbb839 MM |
4525 | /* The location at which the next field should be inserted. */ |
4526 | tree *next_field; | |
4527 | /* T, as a base class. */ | |
4528 | tree base_t; | |
5c24fba6 MM |
4529 | |
4530 | /* Keep track of the first non-static data member. */ | |
4531 | non_static_data_members = TYPE_FIELDS (t); | |
4532 | ||
770ae6cc RK |
4533 | /* Start laying out the record. */ |
4534 | rli = start_record_layout (t); | |
534170eb | 4535 | |
fc6633e0 NS |
4536 | /* Mark all the primary bases in the hierarchy. */ |
4537 | determine_primary_bases (t); | |
8026246f | 4538 | |
5c24fba6 | 4539 | /* Create a pointer to our virtual function table. */ |
58731fd1 | 4540 | vptr = create_vtable_ptr (t, virtuals_p); |
5c24fba6 | 4541 | |
3461fba7 | 4542 | /* The vptr is always the first thing in the class. */ |
1f84ec23 | 4543 | if (vptr) |
5c24fba6 | 4544 | { |
17bbb839 MM |
4545 | TREE_CHAIN (vptr) = TYPE_FIELDS (t); |
4546 | TYPE_FIELDS (t) = vptr; | |
4547 | next_field = &TREE_CHAIN (vptr); | |
770ae6cc | 4548 | place_field (rli, vptr); |
5c24fba6 | 4549 | } |
17bbb839 MM |
4550 | else |
4551 | next_field = &TYPE_FIELDS (t); | |
5c24fba6 | 4552 | |
72a50ab0 | 4553 | /* Build FIELD_DECLs for all of the non-virtual base-types. */ |
c8094d83 | 4554 | empty_base_offsets = splay_tree_new (splay_tree_compare_integer_csts, |
c20118a8 | 4555 | NULL, NULL); |
58731fd1 | 4556 | build_base_fields (rli, empty_base_offsets, next_field); |
c8094d83 | 4557 | |
5c24fba6 | 4558 | /* Layout the non-static data members. */ |
770ae6cc | 4559 | for (field = non_static_data_members; field; field = TREE_CHAIN (field)) |
5c24fba6 | 4560 | { |
01955e96 MM |
4561 | tree type; |
4562 | tree padding; | |
5c24fba6 MM |
4563 | |
4564 | /* We still pass things that aren't non-static data members to | |
4565 | the back-end, in case it wants to do something with them. */ | |
4566 | if (TREE_CODE (field) != FIELD_DECL) | |
4567 | { | |
770ae6cc | 4568 | place_field (rli, field); |
0154eaa8 | 4569 | /* If the static data member has incomplete type, keep track |
c8094d83 | 4570 | of it so that it can be completed later. (The handling |
0154eaa8 MM |
4571 | of pending statics in finish_record_layout is |
4572 | insufficient; consider: | |
4573 | ||
4574 | struct S1; | |
4575 | struct S2 { static S1 s1; }; | |
c8094d83 | 4576 | |
0cbd7506 | 4577 | At this point, finish_record_layout will be called, but |
0154eaa8 MM |
4578 | S1 is still incomplete.) */ |
4579 | if (TREE_CODE (field) == VAR_DECL) | |
532b37d9 MM |
4580 | { |
4581 | maybe_register_incomplete_var (field); | |
4582 | /* The visibility of static data members is determined | |
4583 | at their point of declaration, not their point of | |
4584 | definition. */ | |
4585 | determine_visibility (field); | |
4586 | } | |
5c24fba6 MM |
4587 | continue; |
4588 | } | |
4589 | ||
01955e96 | 4590 | type = TREE_TYPE (field); |
c8094d83 | 4591 | |
1e099144 | 4592 | padding = NULL_TREE; |
01955e96 MM |
4593 | |
4594 | /* If this field is a bit-field whose width is greater than its | |
3461fba7 NS |
4595 | type, then there are some special rules for allocating |
4596 | it. */ | |
01955e96 | 4597 | if (DECL_C_BIT_FIELD (field) |
1f84ec23 | 4598 | && INT_CST_LT (TYPE_SIZE (type), DECL_SIZE (field))) |
01955e96 MM |
4599 | { |
4600 | integer_type_kind itk; | |
4601 | tree integer_type; | |
555456b1 | 4602 | bool was_unnamed_p = false; |
01955e96 MM |
4603 | /* We must allocate the bits as if suitably aligned for the |
4604 | longest integer type that fits in this many bits. type | |
4605 | of the field. Then, we are supposed to use the left over | |
4606 | bits as additional padding. */ | |
4607 | for (itk = itk_char; itk != itk_none; ++itk) | |
c8094d83 | 4608 | if (INT_CST_LT (DECL_SIZE (field), |
01955e96 MM |
4609 | TYPE_SIZE (integer_types[itk]))) |
4610 | break; | |
4611 | ||
4612 | /* ITK now indicates a type that is too large for the | |
4613 | field. We have to back up by one to find the largest | |
4614 | type that fits. */ | |
4615 | integer_type = integer_types[itk - 1]; | |
2d3e278d | 4616 | |
1e099144 MM |
4617 | /* Figure out how much additional padding is required. GCC |
4618 | 3.2 always created a padding field, even if it had zero | |
4619 | width. */ | |
4620 | if (!abi_version_at_least (2) | |
4621 | || INT_CST_LT (TYPE_SIZE (integer_type), DECL_SIZE (field))) | |
2d3e278d | 4622 | { |
1e099144 MM |
4623 | if (abi_version_at_least (2) && TREE_CODE (t) == UNION_TYPE) |
4624 | /* In a union, the padding field must have the full width | |
4625 | of the bit-field; all fields start at offset zero. */ | |
4626 | padding = DECL_SIZE (field); | |
4627 | else | |
4628 | { | |
4629 | if (warn_abi && TREE_CODE (t) == UNION_TYPE) | |
d4ee4d25 | 4630 | warning (0, "size assigned to %qT may not be " |
1e099144 | 4631 | "ABI-compliant and may change in a future " |
c8094d83 | 4632 | "version of GCC", |
1e099144 MM |
4633 | t); |
4634 | padding = size_binop (MINUS_EXPR, DECL_SIZE (field), | |
4635 | TYPE_SIZE (integer_type)); | |
4636 | } | |
2d3e278d | 4637 | } |
c9372112 | 4638 | #ifdef PCC_BITFIELD_TYPE_MATTERS |
63e5f567 MM |
4639 | /* An unnamed bitfield does not normally affect the |
4640 | alignment of the containing class on a target where | |
4641 | PCC_BITFIELD_TYPE_MATTERS. But, the C++ ABI does not | |
4642 | make any exceptions for unnamed bitfields when the | |
4643 | bitfields are longer than their types. Therefore, we | |
4644 | temporarily give the field a name. */ | |
4645 | if (PCC_BITFIELD_TYPE_MATTERS && !DECL_NAME (field)) | |
4646 | { | |
4647 | was_unnamed_p = true; | |
4648 | DECL_NAME (field) = make_anon_name (); | |
4649 | } | |
c9372112 | 4650 | #endif |
01955e96 MM |
4651 | DECL_SIZE (field) = TYPE_SIZE (integer_type); |
4652 | DECL_ALIGN (field) = TYPE_ALIGN (integer_type); | |
11cf4d18 | 4653 | DECL_USER_ALIGN (field) = TYPE_USER_ALIGN (integer_type); |
555456b1 MM |
4654 | layout_nonempty_base_or_field (rli, field, NULL_TREE, |
4655 | empty_base_offsets); | |
4656 | if (was_unnamed_p) | |
4657 | DECL_NAME (field) = NULL_TREE; | |
4658 | /* Now that layout has been performed, set the size of the | |
4659 | field to the size of its declared type; the rest of the | |
4660 | field is effectively invisible. */ | |
4661 | DECL_SIZE (field) = TYPE_SIZE (type); | |
29edb15c MM |
4662 | /* We must also reset the DECL_MODE of the field. */ |
4663 | if (abi_version_at_least (2)) | |
4664 | DECL_MODE (field) = TYPE_MODE (type); | |
4665 | else if (warn_abi | |
4666 | && DECL_MODE (field) != TYPE_MODE (type)) | |
4667 | /* Versions of G++ before G++ 3.4 did not reset the | |
4668 | DECL_MODE. */ | |
d4ee4d25 | 4669 | warning (0, "the offset of %qD may not be ABI-compliant and may " |
29edb15c | 4670 | "change in a future version of GCC", field); |
01955e96 | 4671 | } |
555456b1 MM |
4672 | else |
4673 | layout_nonempty_base_or_field (rli, field, NULL_TREE, | |
4674 | empty_base_offsets); | |
01955e96 | 4675 | |
2003cd37 MM |
4676 | /* Remember the location of any empty classes in FIELD. */ |
4677 | if (abi_version_at_least (2)) | |
c8094d83 | 4678 | record_subobject_offsets (TREE_TYPE (field), |
2003cd37 MM |
4679 | byte_position(field), |
4680 | empty_base_offsets, | |
c5a35c3c | 4681 | /*is_data_member=*/true); |
2003cd37 | 4682 | |
eca7f13c MM |
4683 | /* If a bit-field does not immediately follow another bit-field, |
4684 | and yet it starts in the middle of a byte, we have failed to | |
4685 | comply with the ABI. */ | |
4686 | if (warn_abi | |
c8094d83 | 4687 | && DECL_C_BIT_FIELD (field) |
660845bf ZL |
4688 | /* The TREE_NO_WARNING flag gets set by Objective-C when |
4689 | laying out an Objective-C class. The ObjC ABI differs | |
4690 | from the C++ ABI, and so we do not want a warning | |
4691 | here. */ | |
4692 | && !TREE_NO_WARNING (field) | |
eca7f13c MM |
4693 | && !last_field_was_bitfield |
4694 | && !integer_zerop (size_binop (TRUNC_MOD_EXPR, | |
4695 | DECL_FIELD_BIT_OFFSET (field), | |
4696 | bitsize_unit_node))) | |
dee15844 JM |
4697 | warning (0, "offset of %q+D is not ABI-compliant and may " |
4698 | "change in a future version of GCC", field); | |
eca7f13c | 4699 | |
956d9305 MM |
4700 | /* G++ used to use DECL_FIELD_OFFSET as if it were the byte |
4701 | offset of the field. */ | |
c8094d83 | 4702 | if (warn_abi |
956d9305 MM |
4703 | && !tree_int_cst_equal (DECL_FIELD_OFFSET (field), |
4704 | byte_position (field)) | |
4705 | && contains_empty_class_p (TREE_TYPE (field))) | |
dee15844 JM |
4706 | warning (0, "%q+D contains empty classes which may cause base " |
4707 | "classes to be placed at different locations in a " | |
4708 | "future version of GCC", field); | |
956d9305 | 4709 | |
01955e96 MM |
4710 | /* If we needed additional padding after this field, add it |
4711 | now. */ | |
4712 | if (padding) | |
4713 | { | |
4714 | tree padding_field; | |
4715 | ||
c8094d83 | 4716 | padding_field = build_decl (FIELD_DECL, |
01955e96 | 4717 | NULL_TREE, |
c8094d83 | 4718 | char_type_node); |
01955e96 MM |
4719 | DECL_BIT_FIELD (padding_field) = 1; |
4720 | DECL_SIZE (padding_field) = padding; | |
1e099144 | 4721 | DECL_CONTEXT (padding_field) = t; |
ea258926 | 4722 | DECL_ARTIFICIAL (padding_field) = 1; |
78e0d62b | 4723 | DECL_IGNORED_P (padding_field) = 1; |
c20118a8 | 4724 | layout_nonempty_base_or_field (rli, padding_field, |
c8094d83 | 4725 | NULL_TREE, |
17bbb839 | 4726 | empty_base_offsets); |
01955e96 | 4727 | } |
eca7f13c MM |
4728 | |
4729 | last_field_was_bitfield = DECL_C_BIT_FIELD (field); | |
5c24fba6 MM |
4730 | } |
4731 | ||
17bbb839 | 4732 | if (abi_version_at_least (2) && !integer_zerop (rli->bitpos)) |
e3ccdd50 MM |
4733 | { |
4734 | /* Make sure that we are on a byte boundary so that the size of | |
4735 | the class without virtual bases will always be a round number | |
4736 | of bytes. */ | |
4737 | rli->bitpos = round_up (rli->bitpos, BITS_PER_UNIT); | |
4738 | normalize_rli (rli); | |
4739 | } | |
17bbb839 | 4740 | |
8a874cb4 MM |
4741 | /* G++ 3.2 does not allow virtual bases to be overlaid with tail |
4742 | padding. */ | |
4743 | if (!abi_version_at_least (2)) | |
4744 | include_empty_classes(rli); | |
58010b57 | 4745 | |
3ef397c1 MM |
4746 | /* Delete all zero-width bit-fields from the list of fields. Now |
4747 | that the type is laid out they are no longer important. */ | |
4748 | remove_zero_width_bit_fields (t); | |
4749 | ||
17bbb839 MM |
4750 | /* Create the version of T used for virtual bases. We do not use |
4751 | make_aggr_type for this version; this is an artificial type. For | |
4752 | a POD type, we just reuse T. */ | |
58731fd1 | 4753 | if (CLASSTYPE_NON_POD_P (t) || CLASSTYPE_EMPTY_P (t)) |
06ceef4e | 4754 | { |
17bbb839 | 4755 | base_t = make_node (TREE_CODE (t)); |
c8094d83 | 4756 | |
58731fd1 MM |
4757 | /* Set the size and alignment for the new type. In G++ 3.2, all |
4758 | empty classes were considered to have size zero when used as | |
4759 | base classes. */ | |
4760 | if (!abi_version_at_least (2) && CLASSTYPE_EMPTY_P (t)) | |
4761 | { | |
4762 | TYPE_SIZE (base_t) = bitsize_zero_node; | |
4763 | TYPE_SIZE_UNIT (base_t) = size_zero_node; | |
4764 | if (warn_abi && !integer_zerop (rli_size_unit_so_far (rli))) | |
d4ee4d25 | 4765 | warning (0, "layout of classes derived from empty class %qT " |
58731fd1 MM |
4766 | "may change in a future version of GCC", |
4767 | t); | |
4768 | } | |
4769 | else | |
4770 | { | |
6b99d1c0 MM |
4771 | tree eoc; |
4772 | ||
4773 | /* If the ABI version is not at least two, and the last | |
4774 | field was a bit-field, RLI may not be on a byte | |
4775 | boundary. In particular, rli_size_unit_so_far might | |
4776 | indicate the last complete byte, while rli_size_so_far | |
4777 | indicates the total number of bits used. Therefore, | |
4778 | rli_size_so_far, rather than rli_size_unit_so_far, is | |
4779 | used to compute TYPE_SIZE_UNIT. */ | |
4780 | eoc = end_of_class (t, /*include_virtuals_p=*/0); | |
c8094d83 | 4781 | TYPE_SIZE_UNIT (base_t) |
8a874cb4 | 4782 | = size_binop (MAX_EXPR, |
6b99d1c0 MM |
4783 | convert (sizetype, |
4784 | size_binop (CEIL_DIV_EXPR, | |
4785 | rli_size_so_far (rli), | |
4786 | bitsize_int (BITS_PER_UNIT))), | |
4787 | eoc); | |
c8094d83 | 4788 | TYPE_SIZE (base_t) |
8a874cb4 MM |
4789 | = size_binop (MAX_EXPR, |
4790 | rli_size_so_far (rli), | |
4791 | size_binop (MULT_EXPR, | |
6b99d1c0 | 4792 | convert (bitsizetype, eoc), |
8a874cb4 | 4793 | bitsize_int (BITS_PER_UNIT))); |
58731fd1 | 4794 | } |
17bbb839 MM |
4795 | TYPE_ALIGN (base_t) = rli->record_align; |
4796 | TYPE_USER_ALIGN (base_t) = TYPE_USER_ALIGN (t); | |
4797 | ||
4798 | /* Copy the fields from T. */ | |
4799 | next_field = &TYPE_FIELDS (base_t); | |
4800 | for (field = TYPE_FIELDS (t); field; field = TREE_CHAIN (field)) | |
4801 | if (TREE_CODE (field) == FIELD_DECL) | |
4802 | { | |
4803 | *next_field = build_decl (FIELD_DECL, | |
c8094d83 | 4804 | DECL_NAME (field), |
17bbb839 MM |
4805 | TREE_TYPE (field)); |
4806 | DECL_CONTEXT (*next_field) = base_t; | |
4807 | DECL_FIELD_OFFSET (*next_field) = DECL_FIELD_OFFSET (field); | |
4808 | DECL_FIELD_BIT_OFFSET (*next_field) | |
4809 | = DECL_FIELD_BIT_OFFSET (field); | |
4f0a2b81 MM |
4810 | DECL_SIZE (*next_field) = DECL_SIZE (field); |
4811 | DECL_MODE (*next_field) = DECL_MODE (field); | |
17bbb839 MM |
4812 | next_field = &TREE_CHAIN (*next_field); |
4813 | } | |
4814 | ||
4815 | /* Record the base version of the type. */ | |
4816 | CLASSTYPE_AS_BASE (t) = base_t; | |
5a5cccaa | 4817 | TYPE_CONTEXT (base_t) = t; |
83b14b88 | 4818 | } |
1f84ec23 | 4819 | else |
17bbb839 | 4820 | CLASSTYPE_AS_BASE (t) = t; |
0b41abe6 | 4821 | |
5ec1192e MM |
4822 | /* Every empty class contains an empty class. */ |
4823 | if (CLASSTYPE_EMPTY_P (t)) | |
4824 | CLASSTYPE_CONTAINS_EMPTY_CLASS_P (t) = 1; | |
4825 | ||
8d08fdba MS |
4826 | /* Set the TYPE_DECL for this type to contain the right |
4827 | value for DECL_OFFSET, so that we can use it as part | |
4828 | of a COMPONENT_REF for multiple inheritance. */ | |
d2e5ee5c | 4829 | layout_decl (TYPE_MAIN_DECL (t), 0); |
8d08fdba | 4830 | |
7177d104 MS |
4831 | /* Now fix up any virtual base class types that we left lying |
4832 | around. We must get these done before we try to lay out the | |
5c24fba6 MM |
4833 | virtual function table. As a side-effect, this will remove the |
4834 | base subobject fields. */ | |
17bbb839 MM |
4835 | layout_virtual_bases (rli, empty_base_offsets); |
4836 | ||
c8094d83 | 4837 | /* Make sure that empty classes are reflected in RLI at this |
17bbb839 MM |
4838 | point. */ |
4839 | include_empty_classes(rli); | |
4840 | ||
4841 | /* Make sure not to create any structures with zero size. */ | |
58731fd1 | 4842 | if (integer_zerop (rli_size_unit_so_far (rli)) && CLASSTYPE_EMPTY_P (t)) |
c8094d83 | 4843 | place_field (rli, |
17bbb839 MM |
4844 | build_decl (FIELD_DECL, NULL_TREE, char_type_node)); |
4845 | ||
4846 | /* Let the back-end lay out the type. */ | |
4847 | finish_record_layout (rli, /*free_p=*/true); | |
9785e4b1 | 4848 | |
17bbb839 MM |
4849 | /* Warn about bases that can't be talked about due to ambiguity. */ |
4850 | warn_about_ambiguous_bases (t); | |
78b45a24 | 4851 | |
00bfffa4 JM |
4852 | /* Now that we're done with layout, give the base fields the real types. */ |
4853 | for (field = TYPE_FIELDS (t); field; field = TREE_CHAIN (field)) | |
4854 | if (DECL_ARTIFICIAL (field) && IS_FAKE_BASE_TYPE (TREE_TYPE (field))) | |
4855 | TREE_TYPE (field) = TYPE_CONTEXT (TREE_TYPE (field)); | |
4856 | ||
9785e4b1 | 4857 | /* Clean up. */ |
c20118a8 | 4858 | splay_tree_delete (empty_base_offsets); |
c5a35c3c MM |
4859 | |
4860 | if (CLASSTYPE_EMPTY_P (t) | |
c0572427 MM |
4861 | && tree_int_cst_lt (sizeof_biggest_empty_class, |
4862 | TYPE_SIZE_UNIT (t))) | |
4863 | sizeof_biggest_empty_class = TYPE_SIZE_UNIT (t); | |
2ef16140 | 4864 | } |
c35cce41 | 4865 | |
af287697 MM |
4866 | /* Determine the "key method" for the class type indicated by TYPE, |
4867 | and set CLASSTYPE_KEY_METHOD accordingly. */ | |
9aad8f83 | 4868 | |
af287697 MM |
4869 | void |
4870 | determine_key_method (tree type) | |
9aad8f83 MA |
4871 | { |
4872 | tree method; | |
4873 | ||
4874 | if (TYPE_FOR_JAVA (type) | |
4875 | || processing_template_decl | |
4876 | || CLASSTYPE_TEMPLATE_INSTANTIATION (type) | |
4877 | || CLASSTYPE_INTERFACE_KNOWN (type)) | |
af287697 | 4878 | return; |
9aad8f83 | 4879 | |
af287697 MM |
4880 | /* The key method is the first non-pure virtual function that is not |
4881 | inline at the point of class definition. On some targets the | |
4882 | key function may not be inline; those targets should not call | |
4883 | this function until the end of the translation unit. */ | |
9aad8f83 MA |
4884 | for (method = TYPE_METHODS (type); method != NULL_TREE; |
4885 | method = TREE_CHAIN (method)) | |
4886 | if (DECL_VINDEX (method) != NULL_TREE | |
4887 | && ! DECL_DECLARED_INLINE_P (method) | |
4888 | && ! DECL_PURE_VIRTUAL_P (method)) | |
af287697 MM |
4889 | { |
4890 | CLASSTYPE_KEY_METHOD (type) = method; | |
4891 | break; | |
4892 | } | |
9aad8f83 | 4893 | |
af287697 | 4894 | return; |
9aad8f83 MA |
4895 | } |
4896 | ||
548502d3 MM |
4897 | /* Perform processing required when the definition of T (a class type) |
4898 | is complete. */ | |
2ef16140 MM |
4899 | |
4900 | void | |
94edc4ab | 4901 | finish_struct_1 (tree t) |
2ef16140 MM |
4902 | { |
4903 | tree x; | |
00a17e31 | 4904 | /* A TREE_LIST. The TREE_VALUE of each node is a FUNCTION_DECL. */ |
e6858a84 | 4905 | tree virtuals = NULL_TREE; |
2ef16140 | 4906 | int n_fields = 0; |
2ef16140 | 4907 | |
d0f062fb | 4908 | if (COMPLETE_TYPE_P (t)) |
2ef16140 | 4909 | { |
8dc2b103 | 4910 | gcc_assert (IS_AGGR_TYPE (t)); |
1f070f2b | 4911 | error ("redefinition of %q#T", t); |
2ef16140 MM |
4912 | popclass (); |
4913 | return; | |
4914 | } | |
4915 | ||
2ef16140 MM |
4916 | /* If this type was previously laid out as a forward reference, |
4917 | make sure we lay it out again. */ | |
2ef16140 | 4918 | TYPE_SIZE (t) = NULL_TREE; |
911a71a7 | 4919 | CLASSTYPE_PRIMARY_BINFO (t) = NULL_TREE; |
2ef16140 | 4920 | |
6d0a3f67 | 4921 | fixup_inline_methods (t); |
c8094d83 | 4922 | |
5ec1192e MM |
4923 | /* Make assumptions about the class; we'll reset the flags if |
4924 | necessary. */ | |
58731fd1 MM |
4925 | CLASSTYPE_EMPTY_P (t) = 1; |
4926 | CLASSTYPE_NEARLY_EMPTY_P (t) = 1; | |
5ec1192e | 4927 | CLASSTYPE_CONTAINS_EMPTY_CLASS_P (t) = 0; |
58731fd1 | 4928 | |
2ef16140 | 4929 | /* Do end-of-class semantic processing: checking the validity of the |
03702748 | 4930 | bases and members and add implicitly generated methods. */ |
58731fd1 | 4931 | check_bases_and_members (t); |
2ef16140 | 4932 | |
f4f206f4 | 4933 | /* Find the key method. */ |
a63996f1 | 4934 | if (TYPE_CONTAINS_VPTR_P (t)) |
9aad8f83 | 4935 | { |
af287697 MM |
4936 | /* The Itanium C++ ABI permits the key method to be chosen when |
4937 | the class is defined -- even though the key method so | |
4938 | selected may later turn out to be an inline function. On | |
4939 | some systems (such as ARM Symbian OS) the key method cannot | |
4940 | be determined until the end of the translation unit. On such | |
4941 | systems, we leave CLASSTYPE_KEY_METHOD set to NULL, which | |
4942 | will cause the class to be added to KEYED_CLASSES. Then, in | |
4943 | finish_file we will determine the key method. */ | |
4944 | if (targetm.cxx.key_method_may_be_inline ()) | |
4945 | determine_key_method (t); | |
9aad8f83 MA |
4946 | |
4947 | /* If a polymorphic class has no key method, we may emit the vtable | |
9bcb9aae | 4948 | in every translation unit where the class definition appears. */ |
9aad8f83 MA |
4949 | if (CLASSTYPE_KEY_METHOD (t) == NULL_TREE) |
4950 | keyed_classes = tree_cons (NULL_TREE, t, keyed_classes); | |
4951 | } | |
4952 | ||
2ef16140 | 4953 | /* Layout the class itself. */ |
e93ee644 | 4954 | layout_class_type (t, &virtuals); |
a0c68737 NS |
4955 | if (CLASSTYPE_AS_BASE (t) != t) |
4956 | /* We use the base type for trivial assignments, and hence it | |
4957 | needs a mode. */ | |
4958 | compute_record_mode (CLASSTYPE_AS_BASE (t)); | |
8ebeee52 | 4959 | |
e93ee644 | 4960 | virtuals = modify_all_vtables (t, nreverse (virtuals)); |
db5ae43f | 4961 | |
5e19c053 | 4962 | /* If necessary, create the primary vtable for this class. */ |
e6858a84 | 4963 | if (virtuals || TYPE_CONTAINS_VPTR_P (t)) |
8d08fdba | 4964 | { |
8d08fdba | 4965 | /* We must enter these virtuals into the table. */ |
3ef397c1 | 4966 | if (!CLASSTYPE_HAS_PRIMARY_BASE_P (t)) |
da3d4dfa | 4967 | build_primary_vtable (NULL_TREE, t); |
dbbf88d1 | 4968 | else if (! BINFO_NEW_VTABLE_MARKED (TYPE_BINFO (t))) |
0533d788 MM |
4969 | /* Here we know enough to change the type of our virtual |
4970 | function table, but we will wait until later this function. */ | |
28531dd0 | 4971 | build_primary_vtable (CLASSTYPE_PRIMARY_BINFO (t), t); |
8d08fdba MS |
4972 | } |
4973 | ||
bbd15aac | 4974 | if (TYPE_CONTAINS_VPTR_P (t)) |
8d08fdba | 4975 | { |
e93ee644 MM |
4976 | int vindex; |
4977 | tree fn; | |
4978 | ||
604a3205 | 4979 | if (BINFO_VTABLE (TYPE_BINFO (t))) |
50bc768d | 4980 | gcc_assert (DECL_VIRTUAL_P (BINFO_VTABLE (TYPE_BINFO (t)))); |
1eb4bea9 | 4981 | if (!CLASSTYPE_HAS_PRIMARY_BASE_P (t)) |
50bc768d | 4982 | gcc_assert (BINFO_VIRTUALS (TYPE_BINFO (t)) == NULL_TREE); |
1eb4bea9 | 4983 | |
e6858a84 | 4984 | /* Add entries for virtual functions introduced by this class. */ |
604a3205 NS |
4985 | BINFO_VIRTUALS (TYPE_BINFO (t)) |
4986 | = chainon (BINFO_VIRTUALS (TYPE_BINFO (t)), virtuals); | |
e93ee644 MM |
4987 | |
4988 | /* Set DECL_VINDEX for all functions declared in this class. */ | |
c8094d83 MS |
4989 | for (vindex = 0, fn = BINFO_VIRTUALS (TYPE_BINFO (t)); |
4990 | fn; | |
4991 | fn = TREE_CHAIN (fn), | |
e93ee644 MM |
4992 | vindex += (TARGET_VTABLE_USES_DESCRIPTORS |
4993 | ? TARGET_VTABLE_USES_DESCRIPTORS : 1)) | |
4977bab6 ZW |
4994 | { |
4995 | tree fndecl = BV_FN (fn); | |
4996 | ||
4997 | if (DECL_THUNK_P (fndecl)) | |
4998 | /* A thunk. We should never be calling this entry directly | |
4999 | from this vtable -- we'd use the entry for the non | |
5000 | thunk base function. */ | |
5001 | DECL_VINDEX (fndecl) = NULL_TREE; | |
5002 | else if (TREE_CODE (DECL_VINDEX (fndecl)) != INTEGER_CST) | |
7d60be94 | 5003 | DECL_VINDEX (fndecl) = build_int_cst (NULL_TREE, vindex); |
4977bab6 | 5004 | } |
8d08fdba MS |
5005 | } |
5006 | ||
d2c5305b | 5007 | finish_struct_bits (t); |
8d08fdba | 5008 | |
f30432d7 MS |
5009 | /* Complete the rtl for any static member objects of the type we're |
5010 | working on. */ | |
58010b57 | 5011 | for (x = TYPE_FIELDS (t); x; x = TREE_CHAIN (x)) |
19e7881c | 5012 | if (TREE_CODE (x) == VAR_DECL && TREE_STATIC (x) |
c7f4981a | 5013 | && same_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (x)), t)) |
19e7881c | 5014 | DECL_MODE (x) = TYPE_MODE (t); |
8d08fdba | 5015 | |
f90cdf34 | 5016 | /* Done with FIELDS...now decide whether to sort these for |
58010b57 | 5017 | faster lookups later. |
f90cdf34 | 5018 | |
6c73ad72 | 5019 | We use a small number because most searches fail (succeeding |
f90cdf34 MT |
5020 | ultimately as the search bores through the inheritance |
5021 | hierarchy), and we want this failure to occur quickly. */ | |
5022 | ||
58010b57 MM |
5023 | n_fields = count_fields (TYPE_FIELDS (t)); |
5024 | if (n_fields > 7) | |
f90cdf34 | 5025 | { |
99dd239f | 5026 | struct sorted_fields_type *field_vec = GGC_NEWVAR |
0cbd7506 MS |
5027 | (struct sorted_fields_type, |
5028 | sizeof (struct sorted_fields_type) + n_fields * sizeof (tree)); | |
d07605f5 AP |
5029 | field_vec->len = n_fields; |
5030 | add_fields_to_record_type (TYPE_FIELDS (t), field_vec, 0); | |
5031 | qsort (field_vec->elts, n_fields, sizeof (tree), | |
17211ab5 | 5032 | field_decl_cmp); |
f90cdf34 MT |
5033 | if (! DECL_LANG_SPECIFIC (TYPE_MAIN_DECL (t))) |
5034 | retrofit_lang_decl (TYPE_MAIN_DECL (t)); | |
5035 | DECL_SORTED_FIELDS (TYPE_MAIN_DECL (t)) = field_vec; | |
5036 | } | |
5037 | ||
8d7a5379 MM |
5038 | /* Make the rtl for any new vtables we have created, and unmark |
5039 | the base types we marked. */ | |
5040 | finish_vtbls (t); | |
c8094d83 | 5041 | |
23656158 MM |
5042 | /* Build the VTT for T. */ |
5043 | build_vtt (t); | |
8d7a5379 | 5044 | |
f03e8526 MM |
5045 | /* This warning does not make sense for Java classes, since they |
5046 | cannot have destructors. */ | |
5047 | if (!TYPE_FOR_JAVA (t) && warn_nonvdtor && TYPE_POLYMORPHIC_P (t)) | |
9fd8f60d | 5048 | { |
9f4faeae MM |
5049 | tree dtor; |
5050 | ||
5051 | dtor = CLASSTYPE_DESTRUCTORS (t); | |
5052 | /* Warn only if the dtor is non-private or the class has | |
5053 | friends. */ | |
5054 | if (/* An implicitly declared destructor is always public. And, | |
5055 | if it were virtual, we would have created it by now. */ | |
5056 | !dtor | |
5057 | || (!DECL_VINDEX (dtor) | |
c8094d83 MS |
5058 | && (!TREE_PRIVATE (dtor) |
5059 | || CLASSTYPE_FRIEND_CLASSES (t) | |
9f4faeae | 5060 | || DECL_FRIENDLIST (TYPE_MAIN_DECL (t))))) |
c8094d83 | 5061 | warning (0, "%q#T has virtual functions but non-virtual destructor", |
9f4faeae | 5062 | t); |
9fd8f60d | 5063 | } |
8d08fdba | 5064 | |
0154eaa8 | 5065 | complete_vars (t); |
8d08fdba | 5066 | |
9e9ff709 MS |
5067 | if (warn_overloaded_virtual) |
5068 | warn_hidden (t); | |
8d08fdba | 5069 | |
43d9ad1d DS |
5070 | /* Class layout, assignment of virtual table slots, etc., is now |
5071 | complete. Give the back end a chance to tweak the visibility of | |
5072 | the class or perform any other required target modifications. */ | |
5073 | targetm.cxx.adjust_class_at_definition (t); | |
5074 | ||
ae673f14 | 5075 | maybe_suppress_debug_info (t); |
8d08fdba | 5076 | |
b7442fb5 | 5077 | dump_class_hierarchy (t); |
c8094d83 | 5078 | |
d2e5ee5c | 5079 | /* Finish debugging output for this type. */ |
881c6935 | 5080 | rest_of_type_compilation (t, ! LOCAL_CLASS_P (t)); |
8d08fdba | 5081 | } |
f30432d7 | 5082 | |
61a127b3 MM |
5083 | /* When T was built up, the member declarations were added in reverse |
5084 | order. Rearrange them to declaration order. */ | |
5085 | ||
5086 | void | |
94edc4ab | 5087 | unreverse_member_declarations (tree t) |
61a127b3 MM |
5088 | { |
5089 | tree next; | |
5090 | tree prev; | |
5091 | tree x; | |
5092 | ||
7088fca9 KL |
5093 | /* The following lists are all in reverse order. Put them in |
5094 | declaration order now. */ | |
61a127b3 | 5095 | TYPE_METHODS (t) = nreverse (TYPE_METHODS (t)); |
7088fca9 | 5096 | CLASSTYPE_DECL_LIST (t) = nreverse (CLASSTYPE_DECL_LIST (t)); |
61a127b3 MM |
5097 | |
5098 | /* Actually, for the TYPE_FIELDS, only the non TYPE_DECLs are in | |
5099 | reverse order, so we can't just use nreverse. */ | |
5100 | prev = NULL_TREE; | |
c8094d83 MS |
5101 | for (x = TYPE_FIELDS (t); |
5102 | x && TREE_CODE (x) != TYPE_DECL; | |
61a127b3 MM |
5103 | x = next) |
5104 | { | |
5105 | next = TREE_CHAIN (x); | |
5106 | TREE_CHAIN (x) = prev; | |
5107 | prev = x; | |
5108 | } | |
5109 | if (prev) | |
5110 | { | |
5111 | TREE_CHAIN (TYPE_FIELDS (t)) = x; | |
5112 | if (prev) | |
5113 | TYPE_FIELDS (t) = prev; | |
5114 | } | |
5115 | } | |
5116 | ||
f30432d7 | 5117 | tree |
94edc4ab | 5118 | finish_struct (tree t, tree attributes) |
f30432d7 | 5119 | { |
82a98427 | 5120 | location_t saved_loc = input_location; |
1f0d71c5 | 5121 | |
61a127b3 MM |
5122 | /* Now that we've got all the field declarations, reverse everything |
5123 | as necessary. */ | |
5124 | unreverse_member_declarations (t); | |
f30432d7 | 5125 | |
91d231cb | 5126 | cplus_decl_attributes (&t, attributes, (int) ATTR_FLAG_TYPE_IN_PLACE); |
6467930b | 5127 | |
1f0d71c5 NS |
5128 | /* Nadger the current location so that diagnostics point to the start of |
5129 | the struct, not the end. */ | |
f31686a3 | 5130 | input_location = DECL_SOURCE_LOCATION (TYPE_NAME (t)); |
1f0d71c5 | 5131 | |
5566b478 | 5132 | if (processing_template_decl) |
f30432d7 | 5133 | { |
7fb213d8 GB |
5134 | tree x; |
5135 | ||
b0e0b31f | 5136 | finish_struct_methods (t); |
867580ce | 5137 | TYPE_SIZE (t) = bitsize_zero_node; |
ae54ec16 | 5138 | TYPE_SIZE_UNIT (t) = size_zero_node; |
7fb213d8 GB |
5139 | |
5140 | /* We need to emit an error message if this type was used as a parameter | |
5141 | and it is an abstract type, even if it is a template. We construct | |
5142 | a simple CLASSTYPE_PURE_VIRTUALS list without taking bases into | |
5143 | account and we call complete_vars with this type, which will check | |
5144 | the PARM_DECLS. Note that while the type is being defined, | |
5145 | CLASSTYPE_PURE_VIRTUALS contains the list of the inline friends | |
5146 | (see CLASSTYPE_INLINE_FRIENDS) so we need to clear it. */ | |
585b44d3 | 5147 | CLASSTYPE_PURE_VIRTUALS (t) = NULL; |
7fb213d8 GB |
5148 | for (x = TYPE_METHODS (t); x; x = TREE_CHAIN (x)) |
5149 | if (DECL_PURE_VIRTUAL_P (x)) | |
d4e6fecb | 5150 | VEC_safe_push (tree, gc, CLASSTYPE_PURE_VIRTUALS (t), x); |
7fb213d8 | 5151 | complete_vars (t); |
6f1b4c42 | 5152 | } |
f30432d7 | 5153 | else |
9f33663b | 5154 | finish_struct_1 (t); |
5566b478 | 5155 | |
82a98427 | 5156 | input_location = saved_loc; |
1f0d71c5 | 5157 | |
5566b478 | 5158 | TYPE_BEING_DEFINED (t) = 0; |
8f032717 | 5159 | |
5566b478 | 5160 | if (current_class_type) |
b74a0560 | 5161 | popclass (); |
5566b478 | 5162 | else |
357351e5 | 5163 | error ("trying to finish struct, but kicked out due to previous parse errors"); |
5566b478 | 5164 | |
5f261ba9 MM |
5165 | if (processing_template_decl && at_function_scope_p ()) |
5166 | add_stmt (build_min (TAG_DEFN, t)); | |
ae673f14 | 5167 | |
5566b478 | 5168 | return t; |
f30432d7 | 5169 | } |
8d08fdba | 5170 | \f |
51ddb82e | 5171 | /* Return the dynamic type of INSTANCE, if known. |
8d08fdba MS |
5172 | Used to determine whether the virtual function table is needed |
5173 | or not. | |
5174 | ||
5175 | *NONNULL is set iff INSTANCE can be known to be nonnull, regardless | |
97d953bb MM |
5176 | of our knowledge of its type. *NONNULL should be initialized |
5177 | before this function is called. */ | |
e92cc029 | 5178 | |
d8e178a0 | 5179 | static tree |
94edc4ab | 5180 | fixed_type_or_null (tree instance, int* nonnull, int* cdtorp) |
8d08fdba MS |
5181 | { |
5182 | switch (TREE_CODE (instance)) | |
5183 | { | |
5184 | case INDIRECT_REF: | |
608afcc5 | 5185 | if (POINTER_TYPE_P (TREE_TYPE (instance))) |
a0de9d20 JM |
5186 | return NULL_TREE; |
5187 | else | |
5188 | return fixed_type_or_null (TREE_OPERAND (instance, 0), | |
5189 | nonnull, cdtorp); | |
5190 | ||
8d08fdba MS |
5191 | case CALL_EXPR: |
5192 | /* This is a call to a constructor, hence it's never zero. */ | |
5193 | if (TREE_HAS_CONSTRUCTOR (instance)) | |
5194 | { | |
5195 | if (nonnull) | |
5196 | *nonnull = 1; | |
51ddb82e | 5197 | return TREE_TYPE (instance); |
8d08fdba | 5198 | } |
51ddb82e | 5199 | return NULL_TREE; |
8d08fdba MS |
5200 | |
5201 | case SAVE_EXPR: | |
5202 | /* This is a call to a constructor, hence it's never zero. */ | |
5203 | if (TREE_HAS_CONSTRUCTOR (instance)) | |
5204 | { | |
5205 | if (nonnull) | |
5206 | *nonnull = 1; | |
51ddb82e | 5207 | return TREE_TYPE (instance); |
8d08fdba | 5208 | } |
394fd776 | 5209 | return fixed_type_or_null (TREE_OPERAND (instance, 0), nonnull, cdtorp); |
8d08fdba | 5210 | |
8d08fdba MS |
5211 | case PLUS_EXPR: |
5212 | case MINUS_EXPR: | |
394fd776 NS |
5213 | if (TREE_CODE (TREE_OPERAND (instance, 0)) == ADDR_EXPR) |
5214 | return fixed_type_or_null (TREE_OPERAND (instance, 0), nonnull, cdtorp); | |
8d08fdba MS |
5215 | if (TREE_CODE (TREE_OPERAND (instance, 1)) == INTEGER_CST) |
5216 | /* Propagate nonnull. */ | |
f63ab951 | 5217 | return fixed_type_or_null (TREE_OPERAND (instance, 0), nonnull, cdtorp); |
51ddb82e | 5218 | return NULL_TREE; |
8d08fdba MS |
5219 | |
5220 | case NOP_EXPR: | |
5221 | case CONVERT_EXPR: | |
394fd776 | 5222 | return fixed_type_or_null (TREE_OPERAND (instance, 0), nonnull, cdtorp); |
8d08fdba MS |
5223 | |
5224 | case ADDR_EXPR: | |
88f19756 | 5225 | instance = TREE_OPERAND (instance, 0); |
8d08fdba | 5226 | if (nonnull) |
88f19756 RH |
5227 | { |
5228 | /* Just because we see an ADDR_EXPR doesn't mean we're dealing | |
5229 | with a real object -- given &p->f, p can still be null. */ | |
5230 | tree t = get_base_address (instance); | |
5231 | /* ??? Probably should check DECL_WEAK here. */ | |
5232 | if (t && DECL_P (t)) | |
5233 | *nonnull = 1; | |
5234 | } | |
5235 | return fixed_type_or_null (instance, nonnull, cdtorp); | |
8d08fdba MS |
5236 | |
5237 | case COMPONENT_REF: | |
642124c6 RH |
5238 | /* If this component is really a base class reference, then the field |
5239 | itself isn't definitive. */ | |
5240 | if (DECL_FIELD_IS_BASE (TREE_OPERAND (instance, 1))) | |
0cbd7506 | 5241 | return fixed_type_or_null (TREE_OPERAND (instance, 0), nonnull, cdtorp); |
394fd776 | 5242 | return fixed_type_or_null (TREE_OPERAND (instance, 1), nonnull, cdtorp); |
8d08fdba | 5243 | |
8d08fdba MS |
5244 | case VAR_DECL: |
5245 | case FIELD_DECL: | |
5246 | if (TREE_CODE (TREE_TYPE (instance)) == ARRAY_TYPE | |
5247 | && IS_AGGR_TYPE (TREE_TYPE (TREE_TYPE (instance)))) | |
5248 | { | |
5249 | if (nonnull) | |
5250 | *nonnull = 1; | |
51ddb82e | 5251 | return TREE_TYPE (TREE_TYPE (instance)); |
8d08fdba | 5252 | } |
e92cc029 | 5253 | /* fall through... */ |
8d08fdba MS |
5254 | case TARGET_EXPR: |
5255 | case PARM_DECL: | |
f63ab951 | 5256 | case RESULT_DECL: |
8d08fdba MS |
5257 | if (IS_AGGR_TYPE (TREE_TYPE (instance))) |
5258 | { | |
5259 | if (nonnull) | |
5260 | *nonnull = 1; | |
51ddb82e | 5261 | return TREE_TYPE (instance); |
8d08fdba | 5262 | } |
394fd776 | 5263 | else if (instance == current_class_ptr) |
0cbd7506 MS |
5264 | { |
5265 | if (nonnull) | |
5266 | *nonnull = 1; | |
5267 | ||
5268 | /* if we're in a ctor or dtor, we know our type. */ | |
5269 | if (DECL_LANG_SPECIFIC (current_function_decl) | |
5270 | && (DECL_CONSTRUCTOR_P (current_function_decl) | |
5271 | || DECL_DESTRUCTOR_P (current_function_decl))) | |
5272 | { | |
5273 | if (cdtorp) | |
5274 | *cdtorp = 1; | |
5275 | return TREE_TYPE (TREE_TYPE (instance)); | |
5276 | } | |
5277 | } | |
394fd776 | 5278 | else if (TREE_CODE (TREE_TYPE (instance)) == REFERENCE_TYPE) |
0cbd7506 MS |
5279 | { |
5280 | /* Reference variables should be references to objects. */ | |
5281 | if (nonnull) | |
8d08fdba | 5282 | *nonnull = 1; |
c8094d83 | 5283 | |
772f8889 MM |
5284 | /* DECL_VAR_MARKED_P is used to prevent recursion; a |
5285 | variable's initializer may refer to the variable | |
5286 | itself. */ | |
c8094d83 | 5287 | if (TREE_CODE (instance) == VAR_DECL |
772f8889 MM |
5288 | && DECL_INITIAL (instance) |
5289 | && !DECL_VAR_MARKED_P (instance)) | |
5290 | { | |
5291 | tree type; | |
5292 | DECL_VAR_MARKED_P (instance) = 1; | |
5293 | type = fixed_type_or_null (DECL_INITIAL (instance), | |
5294 | nonnull, cdtorp); | |
5295 | DECL_VAR_MARKED_P (instance) = 0; | |
5296 | return type; | |
5297 | } | |
8d08fdba | 5298 | } |
51ddb82e | 5299 | return NULL_TREE; |
8d08fdba MS |
5300 | |
5301 | default: | |
51ddb82e | 5302 | return NULL_TREE; |
8d08fdba MS |
5303 | } |
5304 | } | |
51ddb82e | 5305 | |
838dfd8a | 5306 | /* Return nonzero if the dynamic type of INSTANCE is known, and |
338d90b8 NS |
5307 | equivalent to the static type. We also handle the case where |
5308 | INSTANCE is really a pointer. Return negative if this is a | |
5309 | ctor/dtor. There the dynamic type is known, but this might not be | |
5310 | the most derived base of the original object, and hence virtual | |
5311 | bases may not be layed out according to this type. | |
51ddb82e JM |
5312 | |
5313 | Used to determine whether the virtual function table is needed | |
5314 | or not. | |
5315 | ||
5316 | *NONNULL is set iff INSTANCE can be known to be nonnull, regardless | |
97d953bb MM |
5317 | of our knowledge of its type. *NONNULL should be initialized |
5318 | before this function is called. */ | |
51ddb82e JM |
5319 | |
5320 | int | |
94edc4ab | 5321 | resolves_to_fixed_type_p (tree instance, int* nonnull) |
51ddb82e JM |
5322 | { |
5323 | tree t = TREE_TYPE (instance); | |
394fd776 | 5324 | int cdtorp = 0; |
c8094d83 | 5325 | |
394fd776 | 5326 | tree fixed = fixed_type_or_null (instance, nonnull, &cdtorp); |
51ddb82e JM |
5327 | if (fixed == NULL_TREE) |
5328 | return 0; | |
5329 | if (POINTER_TYPE_P (t)) | |
5330 | t = TREE_TYPE (t); | |
394fd776 NS |
5331 | if (!same_type_ignoring_top_level_qualifiers_p (t, fixed)) |
5332 | return 0; | |
5333 | return cdtorp ? -1 : 1; | |
51ddb82e JM |
5334 | } |
5335 | ||
8d08fdba MS |
5336 | \f |
5337 | void | |
94edc4ab | 5338 | init_class_processing (void) |
8d08fdba MS |
5339 | { |
5340 | current_class_depth = 0; | |
61a127b3 | 5341 | current_class_stack_size = 10; |
c8094d83 | 5342 | current_class_stack |
0ac1b889 | 5343 | = XNEWVEC (struct class_stack_node, current_class_stack_size); |
806aa901 | 5344 | local_classes = VEC_alloc (tree, gc, 8); |
c5a35c3c | 5345 | sizeof_biggest_empty_class = size_zero_node; |
8d08fdba | 5346 | |
0e5921e8 ZW |
5347 | ridpointers[(int) RID_PUBLIC] = access_public_node; |
5348 | ridpointers[(int) RID_PRIVATE] = access_private_node; | |
5349 | ridpointers[(int) RID_PROTECTED] = access_protected_node; | |
8d08fdba MS |
5350 | } |
5351 | ||
39fb05d0 MM |
5352 | /* Restore the cached PREVIOUS_CLASS_LEVEL. */ |
5353 | ||
5354 | static void | |
5355 | restore_class_cache (void) | |
5356 | { | |
39fb05d0 | 5357 | tree type; |
39fb05d0 MM |
5358 | |
5359 | /* We are re-entering the same class we just left, so we don't | |
5360 | have to search the whole inheritance matrix to find all the | |
5361 | decls to bind again. Instead, we install the cached | |
5362 | class_shadowed list and walk through it binding names. */ | |
5363 | push_binding_level (previous_class_level); | |
5364 | class_binding_level = previous_class_level; | |
39fb05d0 | 5365 | /* Restore IDENTIFIER_TYPE_VALUE. */ |
c8094d83 MS |
5366 | for (type = class_binding_level->type_shadowed; |
5367 | type; | |
39fb05d0 MM |
5368 | type = TREE_CHAIN (type)) |
5369 | SET_IDENTIFIER_TYPE_VALUE (TREE_PURPOSE (type), TREE_TYPE (type)); | |
5370 | } | |
5371 | ||
a723baf1 MM |
5372 | /* Set global variables CURRENT_CLASS_NAME and CURRENT_CLASS_TYPE as |
5373 | appropriate for TYPE. | |
8d08fdba | 5374 | |
8d08fdba MS |
5375 | So that we may avoid calls to lookup_name, we cache the _TYPE |
5376 | nodes of local TYPE_DECLs in the TREE_TYPE field of the name. | |
5377 | ||
5378 | For multiple inheritance, we perform a two-pass depth-first search | |
39fb05d0 | 5379 | of the type lattice. */ |
8d08fdba MS |
5380 | |
5381 | void | |
29370796 | 5382 | pushclass (tree type) |
8d08fdba | 5383 | { |
7fb4a8f7 | 5384 | type = TYPE_MAIN_VARIANT (type); |
8d08fdba | 5385 | |
61a127b3 | 5386 | /* Make sure there is enough room for the new entry on the stack. */ |
c8094d83 | 5387 | if (current_class_depth + 1 >= current_class_stack_size) |
8d08fdba | 5388 | { |
61a127b3 MM |
5389 | current_class_stack_size *= 2; |
5390 | current_class_stack | |
7767580e GDR |
5391 | = XRESIZEVEC (struct class_stack_node, current_class_stack, |
5392 | current_class_stack_size); | |
8d08fdba MS |
5393 | } |
5394 | ||
61a127b3 MM |
5395 | /* Insert a new entry on the class stack. */ |
5396 | current_class_stack[current_class_depth].name = current_class_name; | |
5397 | current_class_stack[current_class_depth].type = current_class_type; | |
5398 | current_class_stack[current_class_depth].access = current_access_specifier; | |
8f032717 | 5399 | current_class_stack[current_class_depth].names_used = 0; |
61a127b3 MM |
5400 | current_class_depth++; |
5401 | ||
5402 | /* Now set up the new type. */ | |
8d08fdba MS |
5403 | current_class_name = TYPE_NAME (type); |
5404 | if (TREE_CODE (current_class_name) == TYPE_DECL) | |
5405 | current_class_name = DECL_NAME (current_class_name); | |
5406 | current_class_type = type; | |
5407 | ||
61a127b3 MM |
5408 | /* By default, things in classes are private, while things in |
5409 | structures or unions are public. */ | |
c8094d83 MS |
5410 | current_access_specifier = (CLASSTYPE_DECLARED_CLASS (type) |
5411 | ? access_private_node | |
61a127b3 MM |
5412 | : access_public_node); |
5413 | ||
89b578be MM |
5414 | if (previous_class_level |
5415 | && type != previous_class_level->this_entity | |
8d08fdba MS |
5416 | && current_class_depth == 1) |
5417 | { | |
5418 | /* Forcibly remove any old class remnants. */ | |
8f032717 | 5419 | invalidate_class_lookup_cache (); |
8d08fdba MS |
5420 | } |
5421 | ||
c8094d83 | 5422 | if (!previous_class_level |
89b578be MM |
5423 | || type != previous_class_level->this_entity |
5424 | || current_class_depth > 1) | |
90ea9897 | 5425 | pushlevel_class (); |
29370796 | 5426 | else |
39fb05d0 | 5427 | restore_class_cache (); |
8f032717 MM |
5428 | } |
5429 | ||
39fb05d0 MM |
5430 | /* When we exit a toplevel class scope, we save its binding level so |
5431 | that we can restore it quickly. Here, we've entered some other | |
5432 | class, so we must invalidate our cache. */ | |
8d08fdba | 5433 | |
8f032717 | 5434 | void |
94edc4ab | 5435 | invalidate_class_lookup_cache (void) |
8f032717 | 5436 | { |
89b578be | 5437 | previous_class_level = NULL; |
8d08fdba | 5438 | } |
c8094d83 | 5439 | |
8d08fdba | 5440 | /* Get out of the current class scope. If we were in a class scope |
b74a0560 | 5441 | previously, that is the one popped to. */ |
e92cc029 | 5442 | |
8d08fdba | 5443 | void |
94edc4ab | 5444 | popclass (void) |
8d08fdba | 5445 | { |
273a708f | 5446 | poplevel_class (); |
8d08fdba MS |
5447 | |
5448 | current_class_depth--; | |
61a127b3 MM |
5449 | current_class_name = current_class_stack[current_class_depth].name; |
5450 | current_class_type = current_class_stack[current_class_depth].type; | |
5451 | current_access_specifier = current_class_stack[current_class_depth].access; | |
8f032717 MM |
5452 | if (current_class_stack[current_class_depth].names_used) |
5453 | splay_tree_delete (current_class_stack[current_class_depth].names_used); | |
8d08fdba MS |
5454 | } |
5455 | ||
70adf8a9 JM |
5456 | /* Returns 1 if current_class_type is either T or a nested type of T. |
5457 | We start looking from 1 because entry 0 is from global scope, and has | |
5458 | no type. */ | |
b9082e8a JM |
5459 | |
5460 | int | |
94edc4ab | 5461 | currently_open_class (tree t) |
b9082e8a JM |
5462 | { |
5463 | int i; | |
14d22dd6 | 5464 | if (current_class_type && same_type_p (t, current_class_type)) |
b9082e8a | 5465 | return 1; |
70adf8a9 | 5466 | for (i = 1; i < current_class_depth; ++i) |
14d22dd6 MM |
5467 | if (current_class_stack[i].type |
5468 | && same_type_p (current_class_stack [i].type, t)) | |
b9082e8a JM |
5469 | return 1; |
5470 | return 0; | |
5471 | } | |
5472 | ||
70adf8a9 JM |
5473 | /* If either current_class_type or one of its enclosing classes are derived |
5474 | from T, return the appropriate type. Used to determine how we found | |
5475 | something via unqualified lookup. */ | |
5476 | ||
5477 | tree | |
94edc4ab | 5478 | currently_open_derived_class (tree t) |
70adf8a9 JM |
5479 | { |
5480 | int i; | |
5481 | ||
9bcb9aae | 5482 | /* The bases of a dependent type are unknown. */ |
1fb3244a MM |
5483 | if (dependent_type_p (t)) |
5484 | return NULL_TREE; | |
5485 | ||
c44e68a5 KL |
5486 | if (!current_class_type) |
5487 | return NULL_TREE; | |
5488 | ||
70adf8a9 JM |
5489 | if (DERIVED_FROM_P (t, current_class_type)) |
5490 | return current_class_type; | |
5491 | ||
5492 | for (i = current_class_depth - 1; i > 0; --i) | |
5493 | if (DERIVED_FROM_P (t, current_class_stack[i].type)) | |
5494 | return current_class_stack[i].type; | |
5495 | ||
5496 | return NULL_TREE; | |
5497 | } | |
5498 | ||
8d08fdba | 5499 | /* When entering a class scope, all enclosing class scopes' names with |
14d22dd6 MM |
5500 | static meaning (static variables, static functions, types and |
5501 | enumerators) have to be visible. This recursive function calls | |
5502 | pushclass for all enclosing class contexts until global or a local | |
5503 | scope is reached. TYPE is the enclosed class. */ | |
8d08fdba MS |
5504 | |
5505 | void | |
14d22dd6 | 5506 | push_nested_class (tree type) |
8d08fdba | 5507 | { |
a28e3c7f MS |
5508 | tree context; |
5509 | ||
b262d64c | 5510 | /* A namespace might be passed in error cases, like A::B:C. */ |
c8094d83 MS |
5511 | if (type == NULL_TREE |
5512 | || type == error_mark_node | |
b262d64c | 5513 | || TREE_CODE (type) == NAMESPACE_DECL |
07c88314 | 5514 | || ! IS_AGGR_TYPE (type) |
73b0fce8 | 5515 | || TREE_CODE (type) == TEMPLATE_TYPE_PARM |
a1281f45 | 5516 | || TREE_CODE (type) == BOUND_TEMPLATE_TEMPLATE_PARM) |
a28e3c7f | 5517 | return; |
c8094d83 | 5518 | |
d2e5ee5c | 5519 | context = DECL_CONTEXT (TYPE_MAIN_DECL (type)); |
8d08fdba | 5520 | |
6b400b21 | 5521 | if (context && CLASS_TYPE_P (context)) |
14d22dd6 | 5522 | push_nested_class (context); |
29370796 | 5523 | pushclass (type); |
8d08fdba MS |
5524 | } |
5525 | ||
a723baf1 | 5526 | /* Undoes a push_nested_class call. */ |
8d08fdba MS |
5527 | |
5528 | void | |
94edc4ab | 5529 | pop_nested_class (void) |
8d08fdba | 5530 | { |
d2e5ee5c | 5531 | tree context = DECL_CONTEXT (TYPE_MAIN_DECL (current_class_type)); |
8d08fdba | 5532 | |
b74a0560 | 5533 | popclass (); |
6b400b21 | 5534 | if (context && CLASS_TYPE_P (context)) |
b74a0560 | 5535 | pop_nested_class (); |
8d08fdba MS |
5536 | } |
5537 | ||
46ccf50a JM |
5538 | /* Returns the number of extern "LANG" blocks we are nested within. */ |
5539 | ||
5540 | int | |
94edc4ab | 5541 | current_lang_depth (void) |
46ccf50a | 5542 | { |
aff44741 | 5543 | return VEC_length (tree, current_lang_base); |
46ccf50a JM |
5544 | } |
5545 | ||
8d08fdba MS |
5546 | /* Set global variables CURRENT_LANG_NAME to appropriate value |
5547 | so that behavior of name-mangling machinery is correct. */ | |
5548 | ||
5549 | void | |
94edc4ab | 5550 | push_lang_context (tree name) |
8d08fdba | 5551 | { |
aff44741 | 5552 | VEC_safe_push (tree, gc, current_lang_base, current_lang_name); |
8d08fdba | 5553 | |
e229f2cd | 5554 | if (name == lang_name_cplusplus) |
8d08fdba | 5555 | { |
8d08fdba MS |
5556 | current_lang_name = name; |
5557 | } | |
e229f2cd PB |
5558 | else if (name == lang_name_java) |
5559 | { | |
e229f2cd PB |
5560 | current_lang_name = name; |
5561 | /* DECL_IGNORED_P is initially set for these types, to avoid clutter. | |
5562 | (See record_builtin_java_type in decl.c.) However, that causes | |
5563 | incorrect debug entries if these types are actually used. | |
00a17e31 | 5564 | So we re-enable debug output after extern "Java". */ |
e3cd9945 APB |
5565 | DECL_IGNORED_P (TYPE_NAME (java_byte_type_node)) = 0; |
5566 | DECL_IGNORED_P (TYPE_NAME (java_short_type_node)) = 0; | |
5567 | DECL_IGNORED_P (TYPE_NAME (java_int_type_node)) = 0; | |
5568 | DECL_IGNORED_P (TYPE_NAME (java_long_type_node)) = 0; | |
5569 | DECL_IGNORED_P (TYPE_NAME (java_float_type_node)) = 0; | |
5570 | DECL_IGNORED_P (TYPE_NAME (java_double_type_node)) = 0; | |
5571 | DECL_IGNORED_P (TYPE_NAME (java_char_type_node)) = 0; | |
5572 | DECL_IGNORED_P (TYPE_NAME (java_boolean_type_node)) = 0; | |
e229f2cd | 5573 | } |
8d08fdba MS |
5574 | else if (name == lang_name_c) |
5575 | { | |
8d08fdba MS |
5576 | current_lang_name = name; |
5577 | } | |
5578 | else | |
9e637a26 | 5579 | error ("language string %<\"%E\"%> not recognized", name); |
8d08fdba | 5580 | } |
c8094d83 | 5581 | |
8d08fdba | 5582 | /* Get out of the current language scope. */ |
e92cc029 | 5583 | |
8d08fdba | 5584 | void |
94edc4ab | 5585 | pop_lang_context (void) |
8d08fdba | 5586 | { |
aff44741 | 5587 | current_lang_name = VEC_pop (tree, current_lang_base); |
8d08fdba | 5588 | } |
8d08fdba MS |
5589 | \f |
5590 | /* Type instantiation routines. */ | |
5591 | ||
104bf76a MM |
5592 | /* Given an OVERLOAD and a TARGET_TYPE, return the function that |
5593 | matches the TARGET_TYPE. If there is no satisfactory match, return | |
13a44ee0 | 5594 | error_mark_node, and issue an error & warning messages under control |
92af500d NS |
5595 | of FLAGS. Permit pointers to member function if FLAGS permits. If |
5596 | TEMPLATE_ONLY, the name of the overloaded function was a | |
5597 | template-id, and EXPLICIT_TARGS are the explicitly provided | |
104bf76a MM |
5598 | template arguments. */ |
5599 | ||
2c73f9f5 | 5600 | static tree |
c8094d83 | 5601 | resolve_address_of_overloaded_function (tree target_type, |
94edc4ab | 5602 | tree overload, |
92af500d NS |
5603 | tsubst_flags_t flags, |
5604 | bool template_only, | |
94edc4ab | 5605 | tree explicit_targs) |
2c73f9f5 | 5606 | { |
104bf76a | 5607 | /* Here's what the standard says: |
c8094d83 | 5608 | |
104bf76a MM |
5609 | [over.over] |
5610 | ||
5611 | If the name is a function template, template argument deduction | |
5612 | is done, and if the argument deduction succeeds, the deduced | |
5613 | arguments are used to generate a single template function, which | |
5614 | is added to the set of overloaded functions considered. | |
5615 | ||
5616 | Non-member functions and static member functions match targets of | |
5617 | type "pointer-to-function" or "reference-to-function." Nonstatic | |
5618 | member functions match targets of type "pointer-to-member | |
5619 | function;" the function type of the pointer to member is used to | |
5620 | select the member function from the set of overloaded member | |
5621 | functions. If a nonstatic member function is selected, the | |
5622 | reference to the overloaded function name is required to have the | |
5623 | form of a pointer to member as described in 5.3.1. | |
5624 | ||
5625 | If more than one function is selected, any template functions in | |
5626 | the set are eliminated if the set also contains a non-template | |
5627 | function, and any given template function is eliminated if the | |
5628 | set contains a second template function that is more specialized | |
5629 | than the first according to the partial ordering rules 14.5.5.2. | |
5630 | After such eliminations, if any, there shall remain exactly one | |
5631 | selected function. */ | |
5632 | ||
5633 | int is_ptrmem = 0; | |
5634 | int is_reference = 0; | |
5635 | /* We store the matches in a TREE_LIST rooted here. The functions | |
5636 | are the TREE_PURPOSE, not the TREE_VALUE, in this list, for easy | |
5637 | interoperability with most_specialized_instantiation. */ | |
5638 | tree matches = NULL_TREE; | |
50714e79 | 5639 | tree fn; |
104bf76a | 5640 | |
d8f8dca1 MM |
5641 | /* By the time we get here, we should be seeing only real |
5642 | pointer-to-member types, not the internal POINTER_TYPE to | |
5643 | METHOD_TYPE representation. */ | |
50bc768d NS |
5644 | gcc_assert (TREE_CODE (target_type) != POINTER_TYPE |
5645 | || TREE_CODE (TREE_TYPE (target_type)) != METHOD_TYPE); | |
104bf76a | 5646 | |
50bc768d | 5647 | gcc_assert (is_overloaded_fn (overload)); |
c8094d83 | 5648 | |
104bf76a MM |
5649 | /* Check that the TARGET_TYPE is reasonable. */ |
5650 | if (TYPE_PTRFN_P (target_type)) | |
381ddaa6 | 5651 | /* This is OK. */; |
104bf76a MM |
5652 | else if (TYPE_PTRMEMFUNC_P (target_type)) |
5653 | /* This is OK, too. */ | |
5654 | is_ptrmem = 1; | |
5655 | else if (TREE_CODE (target_type) == FUNCTION_TYPE) | |
5656 | { | |
5657 | /* This is OK, too. This comes from a conversion to reference | |
5658 | type. */ | |
5659 | target_type = build_reference_type (target_type); | |
5660 | is_reference = 1; | |
5661 | } | |
c8094d83 | 5662 | else |
104bf76a | 5663 | { |
92af500d | 5664 | if (flags & tf_error) |
c4f73174 | 5665 | error ("cannot resolve overloaded function %qD based on" |
0cbd7506 MS |
5666 | " conversion to type %qT", |
5667 | DECL_NAME (OVL_FUNCTION (overload)), target_type); | |
104bf76a MM |
5668 | return error_mark_node; |
5669 | } | |
c8094d83 | 5670 | |
104bf76a MM |
5671 | /* If we can find a non-template function that matches, we can just |
5672 | use it. There's no point in generating template instantiations | |
5673 | if we're just going to throw them out anyhow. But, of course, we | |
5674 | can only do this when we don't *need* a template function. */ | |
5675 | if (!template_only) | |
5676 | { | |
5677 | tree fns; | |
5678 | ||
a723baf1 | 5679 | for (fns = overload; fns; fns = OVL_NEXT (fns)) |
104bf76a | 5680 | { |
a723baf1 | 5681 | tree fn = OVL_CURRENT (fns); |
104bf76a | 5682 | tree fntype; |
2c73f9f5 | 5683 | |
104bf76a MM |
5684 | if (TREE_CODE (fn) == TEMPLATE_DECL) |
5685 | /* We're not looking for templates just yet. */ | |
5686 | continue; | |
5687 | ||
5688 | if ((TREE_CODE (TREE_TYPE (fn)) == METHOD_TYPE) | |
5689 | != is_ptrmem) | |
5690 | /* We're looking for a non-static member, and this isn't | |
5691 | one, or vice versa. */ | |
5692 | continue; | |
34ff2673 | 5693 | |
d63d5d0c ILT |
5694 | /* Ignore functions which haven't been explicitly |
5695 | declared. */ | |
34ff2673 RS |
5696 | if (DECL_ANTICIPATED (fn)) |
5697 | continue; | |
5698 | ||
104bf76a MM |
5699 | /* See if there's a match. */ |
5700 | fntype = TREE_TYPE (fn); | |
5701 | if (is_ptrmem) | |
5702 | fntype = build_ptrmemfunc_type (build_pointer_type (fntype)); | |
5703 | else if (!is_reference) | |
5704 | fntype = build_pointer_type (fntype); | |
5705 | ||
30f86ec3 | 5706 | if (can_convert_arg (target_type, fntype, fn, LOOKUP_NORMAL)) |
e1b3e07d | 5707 | matches = tree_cons (fn, NULL_TREE, matches); |
104bf76a MM |
5708 | } |
5709 | } | |
5710 | ||
5711 | /* Now, if we've already got a match (or matches), there's no need | |
5712 | to proceed to the template functions. But, if we don't have a | |
5713 | match we need to look at them, too. */ | |
c8094d83 | 5714 | if (!matches) |
2c73f9f5 | 5715 | { |
104bf76a MM |
5716 | tree target_fn_type; |
5717 | tree target_arg_types; | |
8d3631f8 | 5718 | tree target_ret_type; |
104bf76a MM |
5719 | tree fns; |
5720 | ||
5721 | if (is_ptrmem) | |
4393e105 MM |
5722 | target_fn_type |
5723 | = TREE_TYPE (TYPE_PTRMEMFUNC_FN_TYPE (target_type)); | |
2c73f9f5 | 5724 | else |
4393e105 MM |
5725 | target_fn_type = TREE_TYPE (target_type); |
5726 | target_arg_types = TYPE_ARG_TYPES (target_fn_type); | |
8d3631f8 | 5727 | target_ret_type = TREE_TYPE (target_fn_type); |
e5214479 JM |
5728 | |
5729 | /* Never do unification on the 'this' parameter. */ | |
5730 | if (TREE_CODE (target_fn_type) == METHOD_TYPE) | |
5731 | target_arg_types = TREE_CHAIN (target_arg_types); | |
c8094d83 | 5732 | |
a723baf1 | 5733 | for (fns = overload; fns; fns = OVL_NEXT (fns)) |
104bf76a | 5734 | { |
a723baf1 | 5735 | tree fn = OVL_CURRENT (fns); |
104bf76a MM |
5736 | tree instantiation; |
5737 | tree instantiation_type; | |
5738 | tree targs; | |
5739 | ||
5740 | if (TREE_CODE (fn) != TEMPLATE_DECL) | |
5741 | /* We're only looking for templates. */ | |
5742 | continue; | |
5743 | ||
5744 | if ((TREE_CODE (TREE_TYPE (fn)) == METHOD_TYPE) | |
5745 | != is_ptrmem) | |
4393e105 | 5746 | /* We're not looking for a non-static member, and this is |
104bf76a MM |
5747 | one, or vice versa. */ |
5748 | continue; | |
5749 | ||
104bf76a | 5750 | /* Try to do argument deduction. */ |
f31c0a32 | 5751 | targs = make_tree_vec (DECL_NTPARMS (fn)); |
4393e105 | 5752 | if (fn_type_unification (fn, explicit_targs, targs, |
8d3631f8 | 5753 | target_arg_types, target_ret_type, |
30f86ec3 | 5754 | DEDUCE_EXACT, LOOKUP_NORMAL)) |
104bf76a MM |
5755 | /* Argument deduction failed. */ |
5756 | continue; | |
5757 | ||
5758 | /* Instantiate the template. */ | |
92af500d | 5759 | instantiation = instantiate_template (fn, targs, flags); |
104bf76a MM |
5760 | if (instantiation == error_mark_node) |
5761 | /* Instantiation failed. */ | |
5762 | continue; | |
5763 | ||
5764 | /* See if there's a match. */ | |
5765 | instantiation_type = TREE_TYPE (instantiation); | |
5766 | if (is_ptrmem) | |
c8094d83 | 5767 | instantiation_type = |
104bf76a MM |
5768 | build_ptrmemfunc_type (build_pointer_type (instantiation_type)); |
5769 | else if (!is_reference) | |
5770 | instantiation_type = build_pointer_type (instantiation_type); | |
30f86ec3 FJ |
5771 | if (can_convert_arg (target_type, instantiation_type, instantiation, |
5772 | LOOKUP_NORMAL)) | |
e1b3e07d | 5773 | matches = tree_cons (instantiation, fn, matches); |
104bf76a MM |
5774 | } |
5775 | ||
5776 | /* Now, remove all but the most specialized of the matches. */ | |
5777 | if (matches) | |
5778 | { | |
e5214479 | 5779 | tree match = most_specialized_instantiation (matches); |
104bf76a MM |
5780 | |
5781 | if (match != error_mark_node) | |
e1b3e07d | 5782 | matches = tree_cons (match, NULL_TREE, NULL_TREE); |
104bf76a MM |
5783 | } |
5784 | } | |
5785 | ||
5786 | /* Now we should have exactly one function in MATCHES. */ | |
5787 | if (matches == NULL_TREE) | |
5788 | { | |
5789 | /* There were *no* matches. */ | |
92af500d | 5790 | if (flags & tf_error) |
104bf76a | 5791 | { |
0cbd7506 MS |
5792 | error ("no matches converting function %qD to type %q#T", |
5793 | DECL_NAME (OVL_FUNCTION (overload)), | |
5794 | target_type); | |
6b9b6b15 JM |
5795 | |
5796 | /* print_candidates expects a chain with the functions in | |
0cbd7506 MS |
5797 | TREE_VALUE slots, so we cons one up here (we're losing anyway, |
5798 | so why be clever?). */ | |
5799 | for (; overload; overload = OVL_NEXT (overload)) | |
5800 | matches = tree_cons (NULL_TREE, OVL_CURRENT (overload), | |
e1b3e07d | 5801 | matches); |
c8094d83 | 5802 | |
6b9b6b15 | 5803 | print_candidates (matches); |
104bf76a MM |
5804 | } |
5805 | return error_mark_node; | |
2c73f9f5 | 5806 | } |
104bf76a MM |
5807 | else if (TREE_CHAIN (matches)) |
5808 | { | |
5809 | /* There were too many matches. */ | |
5810 | ||
92af500d | 5811 | if (flags & tf_error) |
104bf76a MM |
5812 | { |
5813 | tree match; | |
5814 | ||
0cbd7506 | 5815 | error ("converting overloaded function %qD to type %q#T is ambiguous", |
104bf76a MM |
5816 | DECL_NAME (OVL_FUNCTION (overload)), |
5817 | target_type); | |
5818 | ||
5819 | /* Since print_candidates expects the functions in the | |
5820 | TREE_VALUE slot, we flip them here. */ | |
5821 | for (match = matches; match; match = TREE_CHAIN (match)) | |
5822 | TREE_VALUE (match) = TREE_PURPOSE (match); | |
5823 | ||
5824 | print_candidates (matches); | |
5825 | } | |
c8094d83 | 5826 | |
104bf76a MM |
5827 | return error_mark_node; |
5828 | } | |
5829 | ||
50714e79 MM |
5830 | /* Good, exactly one match. Now, convert it to the correct type. */ |
5831 | fn = TREE_PURPOSE (matches); | |
5832 | ||
b1ce3eb2 | 5833 | if (DECL_NONSTATIC_MEMBER_FUNCTION_P (fn) |
92af500d | 5834 | && !(flags & tf_ptrmem_ok) && !flag_ms_extensions) |
19420d00 | 5835 | { |
b1ce3eb2 | 5836 | static int explained; |
c8094d83 | 5837 | |
92af500d | 5838 | if (!(flags & tf_error)) |
0cbd7506 | 5839 | return error_mark_node; |
19420d00 | 5840 | |
1f070f2b | 5841 | pedwarn ("assuming pointer to member %qD", fn); |
b1ce3eb2 | 5842 | if (!explained) |
0cbd7506 MS |
5843 | { |
5844 | pedwarn ("(a pointer to member can only be formed with %<&%E%>)", fn); | |
5845 | explained = 1; | |
5846 | } | |
19420d00 | 5847 | } |
84583208 MM |
5848 | |
5849 | /* If we're doing overload resolution purely for the purpose of | |
5850 | determining conversion sequences, we should not consider the | |
5851 | function used. If this conversion sequence is selected, the | |
5852 | function will be marked as used at this point. */ | |
5853 | if (!(flags & tf_conv)) | |
5854 | mark_used (fn); | |
a6ecf8b6 | 5855 | |
50714e79 MM |
5856 | if (TYPE_PTRFN_P (target_type) || TYPE_PTRMEMFUNC_P (target_type)) |
5857 | return build_unary_op (ADDR_EXPR, fn, 0); | |
5858 | else | |
5859 | { | |
5860 | /* The target must be a REFERENCE_TYPE. Above, build_unary_op | |
5861 | will mark the function as addressed, but here we must do it | |
5862 | explicitly. */ | |
dffd7eb6 | 5863 | cxx_mark_addressable (fn); |
50714e79 MM |
5864 | |
5865 | return fn; | |
5866 | } | |
2c73f9f5 ML |
5867 | } |
5868 | ||
ec255269 MS |
5869 | /* This function will instantiate the type of the expression given in |
5870 | RHS to match the type of LHSTYPE. If errors exist, then return | |
92af500d | 5871 | error_mark_node. FLAGS is a bit mask. If TF_ERROR is set, then |
5e76004e NS |
5872 | we complain on errors. If we are not complaining, never modify rhs, |
5873 | as overload resolution wants to try many possible instantiations, in | |
5874 | the hope that at least one will work. | |
c8094d83 | 5875 | |
e6e174e5 JM |
5876 | For non-recursive calls, LHSTYPE should be a function, pointer to |
5877 | function, or a pointer to member function. */ | |
e92cc029 | 5878 | |
8d08fdba | 5879 | tree |
94edc4ab | 5880 | instantiate_type (tree lhstype, tree rhs, tsubst_flags_t flags) |
8d08fdba | 5881 | { |
92af500d | 5882 | tsubst_flags_t flags_in = flags; |
c8094d83 | 5883 | |
c2ea3a40 | 5884 | flags &= ~tf_ptrmem_ok; |
c8094d83 | 5885 | |
8d08fdba MS |
5886 | if (TREE_CODE (lhstype) == UNKNOWN_TYPE) |
5887 | { | |
92af500d | 5888 | if (flags & tf_error) |
8251199e | 5889 | error ("not enough type information"); |
8d08fdba MS |
5890 | return error_mark_node; |
5891 | } | |
5892 | ||
5893 | if (TREE_TYPE (rhs) != NULL_TREE && ! (type_unknown_p (rhs))) | |
abff8e06 | 5894 | { |
8f4b394d | 5895 | if (same_type_p (lhstype, TREE_TYPE (rhs))) |
abff8e06 | 5896 | return rhs; |
c8094d83 | 5897 | if (flag_ms_extensions |
a723baf1 MM |
5898 | && TYPE_PTRMEMFUNC_P (lhstype) |
5899 | && !TYPE_PTRMEMFUNC_P (TREE_TYPE (rhs))) | |
5900 | /* Microsoft allows `A::f' to be resolved to a | |
5901 | pointer-to-member. */ | |
5902 | ; | |
5903 | else | |
5904 | { | |
92af500d | 5905 | if (flags & tf_error) |
1f070f2b | 5906 | error ("argument of type %qT does not match %qT", |
a723baf1 MM |
5907 | TREE_TYPE (rhs), lhstype); |
5908 | return error_mark_node; | |
5909 | } | |
abff8e06 | 5910 | } |
8d08fdba | 5911 | |
50ad9642 MM |
5912 | if (TREE_CODE (rhs) == BASELINK) |
5913 | rhs = BASELINK_FUNCTIONS (rhs); | |
5914 | ||
5ae9ba3e MM |
5915 | /* If we are in a template, and have a NON_DEPENDENT_EXPR, we cannot |
5916 | deduce any type information. */ | |
5917 | if (TREE_CODE (rhs) == NON_DEPENDENT_EXPR) | |
5918 | { | |
5919 | if (flags & tf_error) | |
5920 | error ("not enough type information"); | |
5921 | return error_mark_node; | |
5922 | } | |
5923 | ||
2c73f9f5 ML |
5924 | /* We don't overwrite rhs if it is an overloaded function. |
5925 | Copying it would destroy the tree link. */ | |
5926 | if (TREE_CODE (rhs) != OVERLOAD) | |
5927 | rhs = copy_node (rhs); | |
c73964b2 | 5928 | |
8d08fdba MS |
5929 | /* This should really only be used when attempting to distinguish |
5930 | what sort of a pointer to function we have. For now, any | |
5931 | arithmetic operation which is not supported on pointers | |
5932 | is rejected as an error. */ | |
5933 | ||
5934 | switch (TREE_CODE (rhs)) | |
5935 | { | |
5936 | case TYPE_EXPR: | |
5937 | case CONVERT_EXPR: | |
5938 | case SAVE_EXPR: | |
5939 | case CONSTRUCTOR: | |
8dc2b103 | 5940 | gcc_unreachable (); |
8d08fdba MS |
5941 | |
5942 | case INDIRECT_REF: | |
5943 | case ARRAY_REF: | |
ec255269 MS |
5944 | { |
5945 | tree new_rhs; | |
8d08fdba | 5946 | |
ec255269 | 5947 | new_rhs = instantiate_type (build_pointer_type (lhstype), |
940ff223 | 5948 | TREE_OPERAND (rhs, 0), flags); |
ec255269 MS |
5949 | if (new_rhs == error_mark_node) |
5950 | return error_mark_node; | |
5951 | ||
5952 | TREE_TYPE (rhs) = lhstype; | |
5953 | TREE_OPERAND (rhs, 0) = new_rhs; | |
5954 | return rhs; | |
5955 | } | |
8d08fdba MS |
5956 | |
5957 | case NOP_EXPR: | |
5958 | rhs = copy_node (TREE_OPERAND (rhs, 0)); | |
5959 | TREE_TYPE (rhs) = unknown_type_node; | |
940ff223 | 5960 | return instantiate_type (lhstype, rhs, flags); |
8d08fdba MS |
5961 | |
5962 | case COMPONENT_REF: | |
92af500d | 5963 | { |
5ae9ba3e | 5964 | tree member = TREE_OPERAND (rhs, 1); |
92af500d | 5965 | |
5ae9ba3e MM |
5966 | member = instantiate_type (lhstype, member, flags); |
5967 | if (member != error_mark_node | |
92af500d | 5968 | && TREE_SIDE_EFFECTS (TREE_OPERAND (rhs, 0))) |
04c06002 | 5969 | /* Do not lose object's side effects. */ |
5ae9ba3e MM |
5970 | return build2 (COMPOUND_EXPR, TREE_TYPE (member), |
5971 | TREE_OPERAND (rhs, 0), member); | |
5972 | return member; | |
92af500d | 5973 | } |
8d08fdba | 5974 | |
2a238a97 | 5975 | case OFFSET_REF: |
05e0b2f4 JM |
5976 | rhs = TREE_OPERAND (rhs, 1); |
5977 | if (BASELINK_P (rhs)) | |
92af500d | 5978 | return instantiate_type (lhstype, BASELINK_FUNCTIONS (rhs), flags_in); |
05e0b2f4 | 5979 | |
2a238a97 MM |
5980 | /* This can happen if we are forming a pointer-to-member for a |
5981 | member template. */ | |
50bc768d | 5982 | gcc_assert (TREE_CODE (rhs) == TEMPLATE_ID_EXPR); |
05e0b2f4 | 5983 | |
2a238a97 | 5984 | /* Fall through. */ |
874503bc | 5985 | |
386b8a85 | 5986 | case TEMPLATE_ID_EXPR: |
2bdb0643 JM |
5987 | { |
5988 | tree fns = TREE_OPERAND (rhs, 0); | |
5989 | tree args = TREE_OPERAND (rhs, 1); | |
5990 | ||
19420d00 | 5991 | return |
92af500d NS |
5992 | resolve_address_of_overloaded_function (lhstype, fns, flags_in, |
5993 | /*template_only=*/true, | |
2bdb0643 | 5994 | args); |
2bdb0643 | 5995 | } |
386b8a85 | 5996 | |
2c73f9f5 | 5997 | case OVERLOAD: |
a723baf1 | 5998 | case FUNCTION_DECL: |
c8094d83 | 5999 | return |
92af500d NS |
6000 | resolve_address_of_overloaded_function (lhstype, rhs, flags_in, |
6001 | /*template_only=*/false, | |
104bf76a | 6002 | /*explicit_targs=*/NULL_TREE); |
2c73f9f5 | 6003 | |
8d08fdba MS |
6004 | case CALL_EXPR: |
6005 | /* This is too hard for now. */ | |
8dc2b103 | 6006 | gcc_unreachable (); |
8d08fdba MS |
6007 | |
6008 | case PLUS_EXPR: | |
6009 | case MINUS_EXPR: | |
6010 | case COMPOUND_EXPR: | |
a0a33927 | 6011 | TREE_OPERAND (rhs, 0) |
940ff223 | 6012 | = instantiate_type (lhstype, TREE_OPERAND (rhs, 0), flags); |
8d08fdba MS |
6013 | if (TREE_OPERAND (rhs, 0) == error_mark_node) |
6014 | return error_mark_node; | |
a0a33927 | 6015 | TREE_OPERAND (rhs, 1) |
940ff223 | 6016 | = instantiate_type (lhstype, TREE_OPERAND (rhs, 1), flags); |
8d08fdba MS |
6017 | if (TREE_OPERAND (rhs, 1) == error_mark_node) |
6018 | return error_mark_node; | |
6019 | ||
6020 | TREE_TYPE (rhs) = lhstype; | |
6021 | return rhs; | |
6022 | ||
6023 | case MULT_EXPR: | |
6024 | case TRUNC_DIV_EXPR: | |
6025 | case FLOOR_DIV_EXPR: | |
6026 | case CEIL_DIV_EXPR: | |
6027 | case ROUND_DIV_EXPR: | |
6028 | case RDIV_EXPR: | |
6029 | case TRUNC_MOD_EXPR: | |
6030 | case FLOOR_MOD_EXPR: | |
6031 | case CEIL_MOD_EXPR: | |
6032 | case ROUND_MOD_EXPR: | |
6033 | case FIX_ROUND_EXPR: | |
6034 | case FIX_FLOOR_EXPR: | |
6035 | case FIX_CEIL_EXPR: | |
6036 | case FIX_TRUNC_EXPR: | |
6037 | case FLOAT_EXPR: | |
6038 | case NEGATE_EXPR: | |
6039 | case ABS_EXPR: | |
6040 | case MAX_EXPR: | |
6041 | case MIN_EXPR: | |
8d08fdba MS |
6042 | |
6043 | case BIT_AND_EXPR: | |
6044 | case BIT_IOR_EXPR: | |
6045 | case BIT_XOR_EXPR: | |
6046 | case LSHIFT_EXPR: | |
6047 | case RSHIFT_EXPR: | |
6048 | case LROTATE_EXPR: | |
6049 | case RROTATE_EXPR: | |
6050 | ||
6051 | case PREINCREMENT_EXPR: | |
6052 | case PREDECREMENT_EXPR: | |
6053 | case POSTINCREMENT_EXPR: | |
6054 | case POSTDECREMENT_EXPR: | |
92af500d | 6055 | if (flags & tf_error) |
8251199e | 6056 | error ("invalid operation on uninstantiated type"); |
8d08fdba MS |
6057 | return error_mark_node; |
6058 | ||
6059 | case TRUTH_AND_EXPR: | |
6060 | case TRUTH_OR_EXPR: | |
6061 | case TRUTH_XOR_EXPR: | |
6062 | case LT_EXPR: | |
6063 | case LE_EXPR: | |
6064 | case GT_EXPR: | |
6065 | case GE_EXPR: | |
6066 | case EQ_EXPR: | |
6067 | case NE_EXPR: | |
6068 | case TRUTH_ANDIF_EXPR: | |
6069 | case TRUTH_ORIF_EXPR: | |
6070 | case TRUTH_NOT_EXPR: | |
92af500d | 6071 | if (flags & tf_error) |
8251199e | 6072 | error ("not enough type information"); |
8d08fdba MS |
6073 | return error_mark_node; |
6074 | ||
ca36f057 MM |
6075 | case COND_EXPR: |
6076 | if (type_unknown_p (TREE_OPERAND (rhs, 0))) | |
6077 | { | |
92af500d | 6078 | if (flags & tf_error) |
ca36f057 MM |
6079 | error ("not enough type information"); |
6080 | return error_mark_node; | |
6081 | } | |
6082 | TREE_OPERAND (rhs, 1) | |
6083 | = instantiate_type (lhstype, TREE_OPERAND (rhs, 1), flags); | |
6084 | if (TREE_OPERAND (rhs, 1) == error_mark_node) | |
6085 | return error_mark_node; | |
6086 | TREE_OPERAND (rhs, 2) | |
6087 | = instantiate_type (lhstype, TREE_OPERAND (rhs, 2), flags); | |
6088 | if (TREE_OPERAND (rhs, 2) == error_mark_node) | |
6089 | return error_mark_node; | |
6090 | ||
6091 | TREE_TYPE (rhs) = lhstype; | |
6092 | return rhs; | |
6093 | ||
6094 | case MODIFY_EXPR: | |
6095 | TREE_OPERAND (rhs, 1) | |
6096 | = instantiate_type (lhstype, TREE_OPERAND (rhs, 1), flags); | |
6097 | if (TREE_OPERAND (rhs, 1) == error_mark_node) | |
6098 | return error_mark_node; | |
6099 | ||
6100 | TREE_TYPE (rhs) = lhstype; | |
6101 | return rhs; | |
c8094d83 | 6102 | |
ca36f057 | 6103 | case ADDR_EXPR: |
19420d00 NS |
6104 | { |
6105 | if (PTRMEM_OK_P (rhs)) | |
0cbd7506 | 6106 | flags |= tf_ptrmem_ok; |
c8094d83 | 6107 | |
ca36f057 | 6108 | return instantiate_type (lhstype, TREE_OPERAND (rhs, 0), flags); |
19420d00 | 6109 | } |
ca36f057 MM |
6110 | |
6111 | case ERROR_MARK: | |
6112 | return error_mark_node; | |
6113 | ||
6114 | default: | |
8dc2b103 | 6115 | gcc_unreachable (); |
ca36f057 | 6116 | } |
8dc2b103 | 6117 | return error_mark_node; |
ca36f057 MM |
6118 | } |
6119 | \f | |
6120 | /* Return the name of the virtual function pointer field | |
6121 | (as an IDENTIFIER_NODE) for the given TYPE. Note that | |
6122 | this may have to look back through base types to find the | |
6123 | ultimate field name. (For single inheritance, these could | |
6124 | all be the same name. Who knows for multiple inheritance). */ | |
6125 | ||
6126 | static tree | |
94edc4ab | 6127 | get_vfield_name (tree type) |
ca36f057 | 6128 | { |
37a247a0 | 6129 | tree binfo, base_binfo; |
ca36f057 MM |
6130 | char *buf; |
6131 | ||
37a247a0 | 6132 | for (binfo = TYPE_BINFO (type); |
fa743e8c | 6133 | BINFO_N_BASE_BINFOS (binfo); |
37a247a0 NS |
6134 | binfo = base_binfo) |
6135 | { | |
6136 | base_binfo = BINFO_BASE_BINFO (binfo, 0); | |
ca36f057 | 6137 | |
37a247a0 NS |
6138 | if (BINFO_VIRTUAL_P (base_binfo) |
6139 | || !TYPE_CONTAINS_VPTR_P (BINFO_TYPE (base_binfo))) | |
6140 | break; | |
6141 | } | |
c8094d83 | 6142 | |
ca36f057 | 6143 | type = BINFO_TYPE (binfo); |
c68b0a84 | 6144 | buf = alloca (sizeof (VFIELD_NAME_FORMAT) + TYPE_NAME_LENGTH (type) + 2); |
ea122333 JM |
6145 | sprintf (buf, VFIELD_NAME_FORMAT, |
6146 | IDENTIFIER_POINTER (constructor_name (type))); | |
ca36f057 MM |
6147 | return get_identifier (buf); |
6148 | } | |
6149 | ||
6150 | void | |
94edc4ab | 6151 | print_class_statistics (void) |
ca36f057 MM |
6152 | { |
6153 | #ifdef GATHER_STATISTICS | |
6154 | fprintf (stderr, "convert_harshness = %d\n", n_convert_harshness); | |
6155 | fprintf (stderr, "compute_conversion_costs = %d\n", n_compute_conversion_costs); | |
ca36f057 MM |
6156 | if (n_vtables) |
6157 | { | |
6158 | fprintf (stderr, "vtables = %d; vtable searches = %d\n", | |
6159 | n_vtables, n_vtable_searches); | |
6160 | fprintf (stderr, "vtable entries = %d; vtable elems = %d\n", | |
6161 | n_vtable_entries, n_vtable_elems); | |
6162 | } | |
6163 | #endif | |
6164 | } | |
6165 | ||
6166 | /* Build a dummy reference to ourselves so Derived::Base (and A::A) works, | |
6167 | according to [class]: | |
0cbd7506 | 6168 | The class-name is also inserted |
ca36f057 MM |
6169 | into the scope of the class itself. For purposes of access checking, |
6170 | the inserted class name is treated as if it were a public member name. */ | |
6171 | ||
6172 | void | |
94edc4ab | 6173 | build_self_reference (void) |
ca36f057 MM |
6174 | { |
6175 | tree name = constructor_name (current_class_type); | |
6176 | tree value = build_lang_decl (TYPE_DECL, name, current_class_type); | |
6177 | tree saved_cas; | |
6178 | ||
6179 | DECL_NONLOCAL (value) = 1; | |
6180 | DECL_CONTEXT (value) = current_class_type; | |
6181 | DECL_ARTIFICIAL (value) = 1; | |
a3d87771 | 6182 | SET_DECL_SELF_REFERENCE_P (value); |
ca36f057 MM |
6183 | |
6184 | if (processing_template_decl) | |
6185 | value = push_template_decl (value); | |
6186 | ||
6187 | saved_cas = current_access_specifier; | |
6188 | current_access_specifier = access_public_node; | |
6189 | finish_member_declaration (value); | |
6190 | current_access_specifier = saved_cas; | |
6191 | } | |
6192 | ||
6193 | /* Returns 1 if TYPE contains only padding bytes. */ | |
6194 | ||
6195 | int | |
94edc4ab | 6196 | is_empty_class (tree type) |
ca36f057 | 6197 | { |
ca36f057 MM |
6198 | if (type == error_mark_node) |
6199 | return 0; | |
6200 | ||
6201 | if (! IS_AGGR_TYPE (type)) | |
6202 | return 0; | |
6203 | ||
58731fd1 MM |
6204 | /* In G++ 3.2, whether or not a class was empty was determined by |
6205 | looking at its size. */ | |
6206 | if (abi_version_at_least (2)) | |
6207 | return CLASSTYPE_EMPTY_P (type); | |
6208 | else | |
6209 | return integer_zerop (CLASSTYPE_SIZE (type)); | |
ca36f057 MM |
6210 | } |
6211 | ||
956d9305 MM |
6212 | /* Returns true if TYPE contains an empty class. */ |
6213 | ||
6214 | static bool | |
6215 | contains_empty_class_p (tree type) | |
6216 | { | |
6217 | if (is_empty_class (type)) | |
6218 | return true; | |
6219 | if (CLASS_TYPE_P (type)) | |
6220 | { | |
6221 | tree field; | |
fa743e8c NS |
6222 | tree binfo; |
6223 | tree base_binfo; | |
956d9305 MM |
6224 | int i; |
6225 | ||
fa743e8c NS |
6226 | for (binfo = TYPE_BINFO (type), i = 0; |
6227 | BINFO_BASE_ITERATE (binfo, i, base_binfo); ++i) | |
6228 | if (contains_empty_class_p (BINFO_TYPE (base_binfo))) | |
956d9305 MM |
6229 | return true; |
6230 | for (field = TYPE_FIELDS (type); field; field = TREE_CHAIN (field)) | |
17bbb839 MM |
6231 | if (TREE_CODE (field) == FIELD_DECL |
6232 | && !DECL_ARTIFICIAL (field) | |
6233 | && is_empty_class (TREE_TYPE (field))) | |
956d9305 MM |
6234 | return true; |
6235 | } | |
6236 | else if (TREE_CODE (type) == ARRAY_TYPE) | |
6237 | return contains_empty_class_p (TREE_TYPE (type)); | |
6238 | return false; | |
6239 | } | |
6240 | ||
ca36f057 MM |
6241 | /* Note that NAME was looked up while the current class was being |
6242 | defined and that the result of that lookup was DECL. */ | |
6243 | ||
6244 | void | |
94edc4ab | 6245 | maybe_note_name_used_in_class (tree name, tree decl) |
ca36f057 MM |
6246 | { |
6247 | splay_tree names_used; | |
6248 | ||
6249 | /* If we're not defining a class, there's nothing to do. */ | |
39fb05d0 MM |
6250 | if (!(innermost_scope_kind() == sk_class |
6251 | && TYPE_BEING_DEFINED (current_class_type))) | |
ca36f057 | 6252 | return; |
c8094d83 | 6253 | |
ca36f057 MM |
6254 | /* If there's already a binding for this NAME, then we don't have |
6255 | anything to worry about. */ | |
c8094d83 | 6256 | if (lookup_member (current_class_type, name, |
39fb05d0 | 6257 | /*protect=*/0, /*want_type=*/false)) |
ca36f057 MM |
6258 | return; |
6259 | ||
6260 | if (!current_class_stack[current_class_depth - 1].names_used) | |
6261 | current_class_stack[current_class_depth - 1].names_used | |
6262 | = splay_tree_new (splay_tree_compare_pointers, 0, 0); | |
6263 | names_used = current_class_stack[current_class_depth - 1].names_used; | |
6264 | ||
6265 | splay_tree_insert (names_used, | |
c8094d83 | 6266 | (splay_tree_key) name, |
ca36f057 MM |
6267 | (splay_tree_value) decl); |
6268 | } | |
6269 | ||
6270 | /* Note that NAME was declared (as DECL) in the current class. Check | |
0e339752 | 6271 | to see that the declaration is valid. */ |
ca36f057 MM |
6272 | |
6273 | void | |
94edc4ab | 6274 | note_name_declared_in_class (tree name, tree decl) |
ca36f057 MM |
6275 | { |
6276 | splay_tree names_used; | |
6277 | splay_tree_node n; | |
6278 | ||
6279 | /* Look to see if we ever used this name. */ | |
c8094d83 | 6280 | names_used |
ca36f057 MM |
6281 | = current_class_stack[current_class_depth - 1].names_used; |
6282 | if (!names_used) | |
6283 | return; | |
6284 | ||
6285 | n = splay_tree_lookup (names_used, (splay_tree_key) name); | |
6286 | if (n) | |
6287 | { | |
6288 | /* [basic.scope.class] | |
c8094d83 | 6289 | |
ca36f057 MM |
6290 | A name N used in a class S shall refer to the same declaration |
6291 | in its context and when re-evaluated in the completed scope of | |
6292 | S. */ | |
1f070f2b | 6293 | error ("declaration of %q#D", decl); |
dee15844 JM |
6294 | error ("changes meaning of %qD from %q+#D", |
6295 | DECL_NAME (OVL_CURRENT (decl)), (tree) n->value); | |
ca36f057 MM |
6296 | } |
6297 | } | |
6298 | ||
3461fba7 NS |
6299 | /* Returns the VAR_DECL for the complete vtable associated with BINFO. |
6300 | Secondary vtables are merged with primary vtables; this function | |
6301 | will return the VAR_DECL for the primary vtable. */ | |
ca36f057 | 6302 | |
c35cce41 | 6303 | tree |
94edc4ab | 6304 | get_vtbl_decl_for_binfo (tree binfo) |
c35cce41 MM |
6305 | { |
6306 | tree decl; | |
6307 | ||
6308 | decl = BINFO_VTABLE (binfo); | |
6309 | if (decl && TREE_CODE (decl) == PLUS_EXPR) | |
6310 | { | |
50bc768d | 6311 | gcc_assert (TREE_CODE (TREE_OPERAND (decl, 0)) == ADDR_EXPR); |
c35cce41 MM |
6312 | decl = TREE_OPERAND (TREE_OPERAND (decl, 0), 0); |
6313 | } | |
6314 | if (decl) | |
50bc768d | 6315 | gcc_assert (TREE_CODE (decl) == VAR_DECL); |
c35cce41 MM |
6316 | return decl; |
6317 | } | |
6318 | ||
911a71a7 | 6319 | |
dbbf88d1 NS |
6320 | /* Returns the binfo for the primary base of BINFO. If the resulting |
6321 | BINFO is a virtual base, and it is inherited elsewhere in the | |
6322 | hierarchy, then the returned binfo might not be the primary base of | |
6323 | BINFO in the complete object. Check BINFO_PRIMARY_P or | |
6324 | BINFO_LOST_PRIMARY_P to be sure. */ | |
911a71a7 MM |
6325 | |
6326 | tree | |
94edc4ab | 6327 | get_primary_binfo (tree binfo) |
911a71a7 MM |
6328 | { |
6329 | tree primary_base; | |
dbbf88d1 | 6330 | tree result; |
c8094d83 | 6331 | |
911a71a7 MM |
6332 | primary_base = CLASSTYPE_PRIMARY_BINFO (BINFO_TYPE (binfo)); |
6333 | if (!primary_base) | |
6334 | return NULL_TREE; | |
6335 | ||
dbbf88d1 | 6336 | result = copied_binfo (primary_base, binfo); |
911a71a7 MM |
6337 | return result; |
6338 | } | |
6339 | ||
838dfd8a | 6340 | /* If INDENTED_P is zero, indent to INDENT. Return nonzero. */ |
b7442fb5 NS |
6341 | |
6342 | static int | |
94edc4ab | 6343 | maybe_indent_hierarchy (FILE * stream, int indent, int indented_p) |
b7442fb5 NS |
6344 | { |
6345 | if (!indented_p) | |
6346 | fprintf (stream, "%*s", indent, ""); | |
6347 | return 1; | |
6348 | } | |
6349 | ||
dbbf88d1 NS |
6350 | /* Dump the offsets of all the bases rooted at BINFO to STREAM. |
6351 | INDENT should be zero when called from the top level; it is | |
6352 | incremented recursively. IGO indicates the next expected BINFO in | |
9bcb9aae | 6353 | inheritance graph ordering. */ |
c35cce41 | 6354 | |
dbbf88d1 NS |
6355 | static tree |
6356 | dump_class_hierarchy_r (FILE *stream, | |
0cbd7506 MS |
6357 | int flags, |
6358 | tree binfo, | |
6359 | tree igo, | |
6360 | int indent) | |
ca36f057 | 6361 | { |
b7442fb5 | 6362 | int indented = 0; |
fa743e8c NS |
6363 | tree base_binfo; |
6364 | int i; | |
c8094d83 | 6365 | |
b7442fb5 NS |
6366 | indented = maybe_indent_hierarchy (stream, indent, 0); |
6367 | fprintf (stream, "%s (0x%lx) ", | |
fc6633e0 | 6368 | type_as_string (BINFO_TYPE (binfo), TFF_PLAIN_IDENTIFIER), |
b7442fb5 | 6369 | (unsigned long) binfo); |
dbbf88d1 NS |
6370 | if (binfo != igo) |
6371 | { | |
6372 | fprintf (stream, "alternative-path\n"); | |
6373 | return igo; | |
6374 | } | |
6375 | igo = TREE_CHAIN (binfo); | |
c8094d83 | 6376 | |
9965d119 | 6377 | fprintf (stream, HOST_WIDE_INT_PRINT_DEC, |
ca36f057 | 6378 | tree_low_cst (BINFO_OFFSET (binfo), 0)); |
9965d119 NS |
6379 | if (is_empty_class (BINFO_TYPE (binfo))) |
6380 | fprintf (stream, " empty"); | |
6381 | else if (CLASSTYPE_NEARLY_EMPTY_P (BINFO_TYPE (binfo))) | |
6382 | fprintf (stream, " nearly-empty"); | |
809e3e7f | 6383 | if (BINFO_VIRTUAL_P (binfo)) |
dbbf88d1 | 6384 | fprintf (stream, " virtual"); |
9965d119 | 6385 | fprintf (stream, "\n"); |
ca36f057 | 6386 | |
b7442fb5 | 6387 | indented = 0; |
fc6633e0 | 6388 | if (BINFO_PRIMARY_P (binfo)) |
b7442fb5 NS |
6389 | { |
6390 | indented = maybe_indent_hierarchy (stream, indent + 3, indented); | |
6391 | fprintf (stream, " primary-for %s (0x%lx)", | |
fc6633e0 | 6392 | type_as_string (BINFO_TYPE (BINFO_INHERITANCE_CHAIN (binfo)), |
b7442fb5 | 6393 | TFF_PLAIN_IDENTIFIER), |
fc6633e0 | 6394 | (unsigned long)BINFO_INHERITANCE_CHAIN (binfo)); |
b7442fb5 NS |
6395 | } |
6396 | if (BINFO_LOST_PRIMARY_P (binfo)) | |
6397 | { | |
6398 | indented = maybe_indent_hierarchy (stream, indent + 3, indented); | |
6399 | fprintf (stream, " lost-primary"); | |
6400 | } | |
6401 | if (indented) | |
6402 | fprintf (stream, "\n"); | |
6403 | ||
6404 | if (!(flags & TDF_SLIM)) | |
6405 | { | |
6406 | int indented = 0; | |
c8094d83 | 6407 | |
b7442fb5 NS |
6408 | if (BINFO_SUBVTT_INDEX (binfo)) |
6409 | { | |
6410 | indented = maybe_indent_hierarchy (stream, indent + 3, indented); | |
6411 | fprintf (stream, " subvttidx=%s", | |
6412 | expr_as_string (BINFO_SUBVTT_INDEX (binfo), | |
6413 | TFF_PLAIN_IDENTIFIER)); | |
6414 | } | |
6415 | if (BINFO_VPTR_INDEX (binfo)) | |
6416 | { | |
6417 | indented = maybe_indent_hierarchy (stream, indent + 3, indented); | |
6418 | fprintf (stream, " vptridx=%s", | |
6419 | expr_as_string (BINFO_VPTR_INDEX (binfo), | |
6420 | TFF_PLAIN_IDENTIFIER)); | |
6421 | } | |
6422 | if (BINFO_VPTR_FIELD (binfo)) | |
6423 | { | |
6424 | indented = maybe_indent_hierarchy (stream, indent + 3, indented); | |
6425 | fprintf (stream, " vbaseoffset=%s", | |
6426 | expr_as_string (BINFO_VPTR_FIELD (binfo), | |
6427 | TFF_PLAIN_IDENTIFIER)); | |
6428 | } | |
6429 | if (BINFO_VTABLE (binfo)) | |
6430 | { | |
6431 | indented = maybe_indent_hierarchy (stream, indent + 3, indented); | |
6432 | fprintf (stream, " vptr=%s", | |
6433 | expr_as_string (BINFO_VTABLE (binfo), | |
6434 | TFF_PLAIN_IDENTIFIER)); | |
6435 | } | |
c8094d83 | 6436 | |
b7442fb5 NS |
6437 | if (indented) |
6438 | fprintf (stream, "\n"); | |
6439 | } | |
dbbf88d1 | 6440 | |
fa743e8c NS |
6441 | for (i = 0; BINFO_BASE_ITERATE (binfo, i, base_binfo); i++) |
6442 | igo = dump_class_hierarchy_r (stream, flags, base_binfo, igo, indent + 2); | |
c8094d83 | 6443 | |
dbbf88d1 | 6444 | return igo; |
c35cce41 MM |
6445 | } |
6446 | ||
6447 | /* Dump the BINFO hierarchy for T. */ | |
6448 | ||
b7442fb5 | 6449 | static void |
bb885938 | 6450 | dump_class_hierarchy_1 (FILE *stream, int flags, tree t) |
c35cce41 | 6451 | { |
b7442fb5 NS |
6452 | fprintf (stream, "Class %s\n", type_as_string (t, TFF_PLAIN_IDENTIFIER)); |
6453 | fprintf (stream, " size=%lu align=%lu\n", | |
6454 | (unsigned long)(tree_low_cst (TYPE_SIZE (t), 0) / BITS_PER_UNIT), | |
6455 | (unsigned long)(TYPE_ALIGN (t) / BITS_PER_UNIT)); | |
dbbf88d1 NS |
6456 | fprintf (stream, " base size=%lu base align=%lu\n", |
6457 | (unsigned long)(tree_low_cst (TYPE_SIZE (CLASSTYPE_AS_BASE (t)), 0) | |
6458 | / BITS_PER_UNIT), | |
6459 | (unsigned long)(TYPE_ALIGN (CLASSTYPE_AS_BASE (t)) | |
6460 | / BITS_PER_UNIT)); | |
6461 | dump_class_hierarchy_r (stream, flags, TYPE_BINFO (t), TYPE_BINFO (t), 0); | |
b7442fb5 | 6462 | fprintf (stream, "\n"); |
bb885938 NS |
6463 | } |
6464 | ||
da1d7781 | 6465 | /* Debug interface to hierarchy dumping. */ |
bb885938 NS |
6466 | |
6467 | extern void | |
6468 | debug_class (tree t) | |
6469 | { | |
6470 | dump_class_hierarchy_1 (stderr, TDF_SLIM, t); | |
6471 | } | |
6472 | ||
6473 | static void | |
6474 | dump_class_hierarchy (tree t) | |
6475 | { | |
6476 | int flags; | |
6477 | FILE *stream = dump_begin (TDI_class, &flags); | |
6478 | ||
6479 | if (stream) | |
6480 | { | |
6481 | dump_class_hierarchy_1 (stream, flags, t); | |
6482 | dump_end (TDI_class, stream); | |
6483 | } | |
b7442fb5 NS |
6484 | } |
6485 | ||
6486 | static void | |
94edc4ab | 6487 | dump_array (FILE * stream, tree decl) |
b7442fb5 | 6488 | { |
4038c495 GB |
6489 | tree value; |
6490 | unsigned HOST_WIDE_INT ix; | |
b7442fb5 NS |
6491 | HOST_WIDE_INT elt; |
6492 | tree size = TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (decl))); | |
6493 | ||
6494 | elt = (tree_low_cst (TYPE_SIZE (TREE_TYPE (TREE_TYPE (decl))), 0) | |
6495 | / BITS_PER_UNIT); | |
6496 | fprintf (stream, "%s:", decl_as_string (decl, TFF_PLAIN_IDENTIFIER)); | |
6497 | fprintf (stream, " %s entries", | |
6498 | expr_as_string (size_binop (PLUS_EXPR, size, size_one_node), | |
6499 | TFF_PLAIN_IDENTIFIER)); | |
6500 | fprintf (stream, "\n"); | |
6501 | ||
4038c495 GB |
6502 | FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (DECL_INITIAL (decl)), |
6503 | ix, value) | |
4fdc14ca | 6504 | fprintf (stream, "%-4ld %s\n", (long)(ix * elt), |
4038c495 | 6505 | expr_as_string (value, TFF_PLAIN_IDENTIFIER)); |
b7442fb5 NS |
6506 | } |
6507 | ||
6508 | static void | |
94edc4ab | 6509 | dump_vtable (tree t, tree binfo, tree vtable) |
b7442fb5 NS |
6510 | { |
6511 | int flags; | |
6512 | FILE *stream = dump_begin (TDI_class, &flags); | |
6513 | ||
6514 | if (!stream) | |
6515 | return; | |
6516 | ||
6517 | if (!(flags & TDF_SLIM)) | |
9965d119 | 6518 | { |
b7442fb5 | 6519 | int ctor_vtbl_p = TYPE_BINFO (t) != binfo; |
c8094d83 | 6520 | |
b7442fb5 NS |
6521 | fprintf (stream, "%s for %s", |
6522 | ctor_vtbl_p ? "Construction vtable" : "Vtable", | |
fc6633e0 | 6523 | type_as_string (BINFO_TYPE (binfo), TFF_PLAIN_IDENTIFIER)); |
b7442fb5 NS |
6524 | if (ctor_vtbl_p) |
6525 | { | |
809e3e7f | 6526 | if (!BINFO_VIRTUAL_P (binfo)) |
b7442fb5 NS |
6527 | fprintf (stream, " (0x%lx instance)", (unsigned long)binfo); |
6528 | fprintf (stream, " in %s", type_as_string (t, TFF_PLAIN_IDENTIFIER)); | |
6529 | } | |
6530 | fprintf (stream, "\n"); | |
6531 | dump_array (stream, vtable); | |
6532 | fprintf (stream, "\n"); | |
9965d119 | 6533 | } |
c8094d83 | 6534 | |
b7442fb5 NS |
6535 | dump_end (TDI_class, stream); |
6536 | } | |
6537 | ||
6538 | static void | |
94edc4ab | 6539 | dump_vtt (tree t, tree vtt) |
b7442fb5 NS |
6540 | { |
6541 | int flags; | |
6542 | FILE *stream = dump_begin (TDI_class, &flags); | |
6543 | ||
6544 | if (!stream) | |
6545 | return; | |
6546 | ||
6547 | if (!(flags & TDF_SLIM)) | |
6548 | { | |
6549 | fprintf (stream, "VTT for %s\n", | |
6550 | type_as_string (t, TFF_PLAIN_IDENTIFIER)); | |
6551 | dump_array (stream, vtt); | |
6552 | fprintf (stream, "\n"); | |
6553 | } | |
c8094d83 | 6554 | |
b7442fb5 | 6555 | dump_end (TDI_class, stream); |
ca36f057 MM |
6556 | } |
6557 | ||
bb885938 NS |
6558 | /* Dump a function or thunk and its thunkees. */ |
6559 | ||
6560 | static void | |
6561 | dump_thunk (FILE *stream, int indent, tree thunk) | |
6562 | { | |
6563 | static const char spaces[] = " "; | |
6564 | tree name = DECL_NAME (thunk); | |
6565 | tree thunks; | |
c8094d83 | 6566 | |
bb885938 NS |
6567 | fprintf (stream, "%.*s%p %s %s", indent, spaces, |
6568 | (void *)thunk, | |
6569 | !DECL_THUNK_P (thunk) ? "function" | |
6570 | : DECL_THIS_THUNK_P (thunk) ? "this-thunk" : "covariant-thunk", | |
6571 | name ? IDENTIFIER_POINTER (name) : "<unset>"); | |
e00853fd | 6572 | if (DECL_THUNK_P (thunk)) |
bb885938 NS |
6573 | { |
6574 | HOST_WIDE_INT fixed_adjust = THUNK_FIXED_OFFSET (thunk); | |
6575 | tree virtual_adjust = THUNK_VIRTUAL_OFFSET (thunk); | |
6576 | ||
6577 | fprintf (stream, " fixed=" HOST_WIDE_INT_PRINT_DEC, fixed_adjust); | |
6578 | if (!virtual_adjust) | |
6579 | /*NOP*/; | |
6580 | else if (DECL_THIS_THUNK_P (thunk)) | |
6581 | fprintf (stream, " vcall=" HOST_WIDE_INT_PRINT_DEC, | |
6582 | tree_low_cst (virtual_adjust, 0)); | |
6583 | else | |
6584 | fprintf (stream, " vbase=" HOST_WIDE_INT_PRINT_DEC "(%s)", | |
6585 | tree_low_cst (BINFO_VPTR_FIELD (virtual_adjust), 0), | |
6586 | type_as_string (BINFO_TYPE (virtual_adjust), TFF_SCOPE)); | |
e00853fd NS |
6587 | if (THUNK_ALIAS (thunk)) |
6588 | fprintf (stream, " alias to %p", (void *)THUNK_ALIAS (thunk)); | |
bb885938 NS |
6589 | } |
6590 | fprintf (stream, "\n"); | |
6591 | for (thunks = DECL_THUNKS (thunk); thunks; thunks = TREE_CHAIN (thunks)) | |
6592 | dump_thunk (stream, indent + 2, thunks); | |
6593 | } | |
6594 | ||
6595 | /* Dump the thunks for FN. */ | |
6596 | ||
6597 | extern void | |
6598 | debug_thunks (tree fn) | |
6599 | { | |
6600 | dump_thunk (stderr, 0, fn); | |
6601 | } | |
6602 | ||
ca36f057 MM |
6603 | /* Virtual function table initialization. */ |
6604 | ||
6605 | /* Create all the necessary vtables for T and its base classes. */ | |
6606 | ||
6607 | static void | |
94edc4ab | 6608 | finish_vtbls (tree t) |
ca36f057 | 6609 | { |
3461fba7 NS |
6610 | tree list; |
6611 | tree vbase; | |
ca36f057 | 6612 | |
3461fba7 NS |
6613 | /* We lay out the primary and secondary vtables in one contiguous |
6614 | vtable. The primary vtable is first, followed by the non-virtual | |
6615 | secondary vtables in inheritance graph order. */ | |
604a3205 | 6616 | list = build_tree_list (BINFO_VTABLE (TYPE_BINFO (t)), NULL_TREE); |
3461fba7 NS |
6617 | accumulate_vtbl_inits (TYPE_BINFO (t), TYPE_BINFO (t), |
6618 | TYPE_BINFO (t), t, list); | |
c8094d83 | 6619 | |
3461fba7 NS |
6620 | /* Then come the virtual bases, also in inheritance graph order. */ |
6621 | for (vbase = TYPE_BINFO (t); vbase; vbase = TREE_CHAIN (vbase)) | |
6622 | { | |
809e3e7f | 6623 | if (!BINFO_VIRTUAL_P (vbase)) |
3461fba7 | 6624 | continue; |
dbbf88d1 | 6625 | accumulate_vtbl_inits (vbase, vbase, TYPE_BINFO (t), t, list); |
ff668506 JM |
6626 | } |
6627 | ||
604a3205 | 6628 | if (BINFO_VTABLE (TYPE_BINFO (t))) |
3461fba7 | 6629 | initialize_vtable (TYPE_BINFO (t), TREE_VALUE (list)); |
ca36f057 MM |
6630 | } |
6631 | ||
6632 | /* Initialize the vtable for BINFO with the INITS. */ | |
6633 | ||
6634 | static void | |
94edc4ab | 6635 | initialize_vtable (tree binfo, tree inits) |
ca36f057 | 6636 | { |
ca36f057 MM |
6637 | tree decl; |
6638 | ||
6639 | layout_vtable_decl (binfo, list_length (inits)); | |
c35cce41 | 6640 | decl = get_vtbl_decl_for_binfo (binfo); |
19c29b2f | 6641 | initialize_artificial_var (decl, inits); |
b7442fb5 | 6642 | dump_vtable (BINFO_TYPE (binfo), binfo, decl); |
23656158 MM |
6643 | } |
6644 | ||
9965d119 NS |
6645 | /* Build the VTT (virtual table table) for T. |
6646 | A class requires a VTT if it has virtual bases. | |
c8094d83 | 6647 | |
9965d119 NS |
6648 | This holds |
6649 | 1 - primary virtual pointer for complete object T | |
90ecce3e JM |
6650 | 2 - secondary VTTs for each direct non-virtual base of T which requires a |
6651 | VTT | |
9965d119 NS |
6652 | 3 - secondary virtual pointers for each direct or indirect base of T which |
6653 | has virtual bases or is reachable via a virtual path from T. | |
6654 | 4 - secondary VTTs for each direct or indirect virtual base of T. | |
c8094d83 | 6655 | |
9965d119 | 6656 | Secondary VTTs look like complete object VTTs without part 4. */ |
23656158 MM |
6657 | |
6658 | static void | |
94edc4ab | 6659 | build_vtt (tree t) |
23656158 MM |
6660 | { |
6661 | tree inits; | |
6662 | tree type; | |
6663 | tree vtt; | |
3ec6bad3 | 6664 | tree index; |
23656158 | 6665 | |
23656158 MM |
6666 | /* Build up the initializers for the VTT. */ |
6667 | inits = NULL_TREE; | |
3ec6bad3 | 6668 | index = size_zero_node; |
9965d119 | 6669 | build_vtt_inits (TYPE_BINFO (t), t, &inits, &index); |
23656158 MM |
6670 | |
6671 | /* If we didn't need a VTT, we're done. */ | |
6672 | if (!inits) | |
6673 | return; | |
6674 | ||
6675 | /* Figure out the type of the VTT. */ | |
442e01b6 | 6676 | type = build_index_type (size_int (list_length (inits) - 1)); |
23656158 | 6677 | type = build_cplus_array_type (const_ptr_type_node, type); |
c8094d83 | 6678 | |
23656158 | 6679 | /* Now, build the VTT object itself. */ |
669ec2b4 | 6680 | vtt = build_vtable (t, get_vtt_name (t), type); |
19c29b2f | 6681 | initialize_artificial_var (vtt, inits); |
548502d3 MM |
6682 | /* Add the VTT to the vtables list. */ |
6683 | TREE_CHAIN (vtt) = TREE_CHAIN (CLASSTYPE_VTABLES (t)); | |
6684 | TREE_CHAIN (CLASSTYPE_VTABLES (t)) = vtt; | |
b7442fb5 NS |
6685 | |
6686 | dump_vtt (t, vtt); | |
23656158 MM |
6687 | } |
6688 | ||
13de7ec4 JM |
6689 | /* When building a secondary VTT, BINFO_VTABLE is set to a TREE_LIST with |
6690 | PURPOSE the RTTI_BINFO, VALUE the real vtable pointer for this binfo, | |
6691 | and CHAIN the vtable pointer for this binfo after construction is | |
00a17e31 | 6692 | complete. VALUE can also be another BINFO, in which case we recurse. */ |
13de7ec4 JM |
6693 | |
6694 | static tree | |
94edc4ab | 6695 | binfo_ctor_vtable (tree binfo) |
13de7ec4 JM |
6696 | { |
6697 | tree vt; | |
6698 | ||
6699 | while (1) | |
6700 | { | |
6701 | vt = BINFO_VTABLE (binfo); | |
6702 | if (TREE_CODE (vt) == TREE_LIST) | |
6703 | vt = TREE_VALUE (vt); | |
95b4aca6 | 6704 | if (TREE_CODE (vt) == TREE_BINFO) |
13de7ec4 JM |
6705 | binfo = vt; |
6706 | else | |
6707 | break; | |
6708 | } | |
6709 | ||
6710 | return vt; | |
6711 | } | |
6712 | ||
a3a0fc7f NS |
6713 | /* Data for secondary VTT initialization. */ |
6714 | typedef struct secondary_vptr_vtt_init_data_s | |
6715 | { | |
6716 | /* Is this the primary VTT? */ | |
6717 | bool top_level_p; | |
6718 | ||
6719 | /* Current index into the VTT. */ | |
6720 | tree index; | |
6721 | ||
6722 | /* TREE_LIST of initializers built up. */ | |
6723 | tree inits; | |
6724 | ||
6725 | /* The type being constructed by this secondary VTT. */ | |
6726 | tree type_being_constructed; | |
6727 | } secondary_vptr_vtt_init_data; | |
6728 | ||
23656158 | 6729 | /* Recursively build the VTT-initializer for BINFO (which is in the |
9965d119 NS |
6730 | hierarchy dominated by T). INITS points to the end of the initializer |
6731 | list to date. INDEX is the VTT index where the next element will be | |
6732 | replaced. Iff BINFO is the binfo for T, this is the top level VTT (i.e. | |
6733 | not a subvtt for some base of T). When that is so, we emit the sub-VTTs | |
6734 | for virtual bases of T. When it is not so, we build the constructor | |
6735 | vtables for the BINFO-in-T variant. */ | |
23656158 MM |
6736 | |
6737 | static tree * | |
a3a0fc7f | 6738 | build_vtt_inits (tree binfo, tree t, tree *inits, tree *index) |
23656158 MM |
6739 | { |
6740 | int i; | |
6741 | tree b; | |
6742 | tree init; | |
6743 | tree secondary_vptrs; | |
a3a0fc7f | 6744 | secondary_vptr_vtt_init_data data; |
539ed333 | 6745 | int top_level_p = SAME_BINFO_TYPE_P (BINFO_TYPE (binfo), t); |
23656158 MM |
6746 | |
6747 | /* We only need VTTs for subobjects with virtual bases. */ | |
5775a06a | 6748 | if (!CLASSTYPE_VBASECLASSES (BINFO_TYPE (binfo))) |
23656158 MM |
6749 | return inits; |
6750 | ||
6751 | /* We need to use a construction vtable if this is not the primary | |
6752 | VTT. */ | |
9965d119 | 6753 | if (!top_level_p) |
3ec6bad3 MM |
6754 | { |
6755 | build_ctor_vtbl_group (binfo, t); | |
6756 | ||
6757 | /* Record the offset in the VTT where this sub-VTT can be found. */ | |
6758 | BINFO_SUBVTT_INDEX (binfo) = *index; | |
6759 | } | |
23656158 MM |
6760 | |
6761 | /* Add the address of the primary vtable for the complete object. */ | |
13de7ec4 | 6762 | init = binfo_ctor_vtable (binfo); |
23656158 MM |
6763 | *inits = build_tree_list (NULL_TREE, init); |
6764 | inits = &TREE_CHAIN (*inits); | |
9965d119 NS |
6765 | if (top_level_p) |
6766 | { | |
50bc768d | 6767 | gcc_assert (!BINFO_VPTR_INDEX (binfo)); |
9965d119 NS |
6768 | BINFO_VPTR_INDEX (binfo) = *index; |
6769 | } | |
3ec6bad3 | 6770 | *index = size_binop (PLUS_EXPR, *index, TYPE_SIZE_UNIT (ptr_type_node)); |
c8094d83 | 6771 | |
23656158 | 6772 | /* Recursively add the secondary VTTs for non-virtual bases. */ |
fa743e8c NS |
6773 | for (i = 0; BINFO_BASE_ITERATE (binfo, i, b); ++i) |
6774 | if (!BINFO_VIRTUAL_P (b)) | |
5d5a519f | 6775 | inits = build_vtt_inits (b, t, inits, index); |
c8094d83 | 6776 | |
23656158 | 6777 | /* Add secondary virtual pointers for all subobjects of BINFO with |
9965d119 NS |
6778 | either virtual bases or reachable along a virtual path, except |
6779 | subobjects that are non-virtual primary bases. */ | |
a3a0fc7f NS |
6780 | data.top_level_p = top_level_p; |
6781 | data.index = *index; | |
6782 | data.inits = NULL; | |
6783 | data.type_being_constructed = BINFO_TYPE (binfo); | |
c8094d83 | 6784 | |
5d5a519f | 6785 | dfs_walk_once (binfo, dfs_build_secondary_vptr_vtt_inits, NULL, &data); |
9965d119 | 6786 | |
a3a0fc7f | 6787 | *index = data.index; |
23656158 MM |
6788 | |
6789 | /* The secondary vptrs come back in reverse order. After we reverse | |
6790 | them, and add the INITS, the last init will be the first element | |
6791 | of the chain. */ | |
a3a0fc7f | 6792 | secondary_vptrs = data.inits; |
23656158 MM |
6793 | if (secondary_vptrs) |
6794 | { | |
6795 | *inits = nreverse (secondary_vptrs); | |
6796 | inits = &TREE_CHAIN (secondary_vptrs); | |
50bc768d | 6797 | gcc_assert (*inits == NULL_TREE); |
23656158 MM |
6798 | } |
6799 | ||
9965d119 | 6800 | if (top_level_p) |
a3a0fc7f NS |
6801 | /* Add the secondary VTTs for virtual bases in inheritance graph |
6802 | order. */ | |
9ccf6541 MM |
6803 | for (b = TYPE_BINFO (BINFO_TYPE (binfo)); b; b = TREE_CHAIN (b)) |
6804 | { | |
809e3e7f | 6805 | if (!BINFO_VIRTUAL_P (b)) |
9ccf6541 | 6806 | continue; |
c8094d83 | 6807 | |
dbbf88d1 | 6808 | inits = build_vtt_inits (b, t, inits, index); |
9ccf6541 | 6809 | } |
a3a0fc7f NS |
6810 | else |
6811 | /* Remove the ctor vtables we created. */ | |
5d5a519f | 6812 | dfs_walk_all (binfo, dfs_fixup_binfo_vtbls, NULL, binfo); |
23656158 MM |
6813 | |
6814 | return inits; | |
6815 | } | |
6816 | ||
8df83eae | 6817 | /* Called from build_vtt_inits via dfs_walk. BINFO is the binfo for the base |
a3a0fc7f | 6818 | in most derived. DATA is a SECONDARY_VPTR_VTT_INIT_DATA structure. */ |
23656158 MM |
6819 | |
6820 | static tree | |
a3a0fc7f | 6821 | dfs_build_secondary_vptr_vtt_inits (tree binfo, void *data_) |
23656158 | 6822 | { |
a3a0fc7f | 6823 | secondary_vptr_vtt_init_data *data = (secondary_vptr_vtt_init_data *)data_; |
23656158 | 6824 | |
23656158 MM |
6825 | /* We don't care about bases that don't have vtables. */ |
6826 | if (!TYPE_VFIELD (BINFO_TYPE (binfo))) | |
5d5a519f | 6827 | return dfs_skip_bases; |
23656158 | 6828 | |
a3a0fc7f NS |
6829 | /* We're only interested in proper subobjects of the type being |
6830 | constructed. */ | |
539ed333 | 6831 | if (SAME_BINFO_TYPE_P (BINFO_TYPE (binfo), data->type_being_constructed)) |
23656158 MM |
6832 | return NULL_TREE; |
6833 | ||
a3a0fc7f NS |
6834 | /* We're only interested in bases with virtual bases or reachable |
6835 | via a virtual path from the type being constructed. */ | |
5d5a519f NS |
6836 | if (!(CLASSTYPE_VBASECLASSES (BINFO_TYPE (binfo)) |
6837 | || binfo_via_virtual (binfo, data->type_being_constructed))) | |
6838 | return dfs_skip_bases; | |
c8094d83 | 6839 | |
5d5a519f NS |
6840 | /* We're not interested in non-virtual primary bases. */ |
6841 | if (!BINFO_VIRTUAL_P (binfo) && BINFO_PRIMARY_P (binfo)) | |
db3d8cde | 6842 | return NULL_TREE; |
c8094d83 | 6843 | |
3ec6bad3 | 6844 | /* Record the index where this secondary vptr can be found. */ |
a3a0fc7f | 6845 | if (data->top_level_p) |
9965d119 | 6846 | { |
50bc768d | 6847 | gcc_assert (!BINFO_VPTR_INDEX (binfo)); |
a3a0fc7f | 6848 | BINFO_VPTR_INDEX (binfo) = data->index; |
3ec6bad3 | 6849 | |
a3a0fc7f NS |
6850 | if (BINFO_VIRTUAL_P (binfo)) |
6851 | { | |
0cbd7506 MS |
6852 | /* It's a primary virtual base, and this is not a |
6853 | construction vtable. Find the base this is primary of in | |
6854 | the inheritance graph, and use that base's vtable | |
6855 | now. */ | |
a3a0fc7f NS |
6856 | while (BINFO_PRIMARY_P (binfo)) |
6857 | binfo = BINFO_INHERITANCE_CHAIN (binfo); | |
6858 | } | |
9965d119 | 6859 | } |
c8094d83 | 6860 | |
a3a0fc7f NS |
6861 | /* Add the initializer for the secondary vptr itself. */ |
6862 | data->inits = tree_cons (NULL_TREE, binfo_ctor_vtable (binfo), data->inits); | |
23656158 | 6863 | |
a3a0fc7f NS |
6864 | /* Advance the vtt index. */ |
6865 | data->index = size_binop (PLUS_EXPR, data->index, | |
6866 | TYPE_SIZE_UNIT (ptr_type_node)); | |
9965d119 | 6867 | |
a3a0fc7f | 6868 | return NULL_TREE; |
9965d119 NS |
6869 | } |
6870 | ||
a3a0fc7f NS |
6871 | /* Called from build_vtt_inits via dfs_walk. After building |
6872 | constructor vtables and generating the sub-vtt from them, we need | |
6873 | to restore the BINFO_VTABLES that were scribbled on. DATA is the | |
6874 | binfo of the base whose sub vtt was generated. */ | |
23656158 MM |
6875 | |
6876 | static tree | |
94edc4ab | 6877 | dfs_fixup_binfo_vtbls (tree binfo, void* data) |
23656158 | 6878 | { |
a3a0fc7f | 6879 | tree vtable = BINFO_VTABLE (binfo); |
23656158 | 6880 | |
5d5a519f NS |
6881 | if (!TYPE_CONTAINS_VPTR_P (BINFO_TYPE (binfo))) |
6882 | /* If this class has no vtable, none of its bases do. */ | |
6883 | return dfs_skip_bases; | |
c8094d83 | 6884 | |
5d5a519f NS |
6885 | if (!vtable) |
6886 | /* This might be a primary base, so have no vtable in this | |
6887 | hierarchy. */ | |
6888 | return NULL_TREE; | |
c8094d83 | 6889 | |
23656158 MM |
6890 | /* If we scribbled the construction vtable vptr into BINFO, clear it |
6891 | out now. */ | |
5d5a519f | 6892 | if (TREE_CODE (vtable) == TREE_LIST |
a3a0fc7f NS |
6893 | && (TREE_PURPOSE (vtable) == (tree) data)) |
6894 | BINFO_VTABLE (binfo) = TREE_CHAIN (vtable); | |
23656158 MM |
6895 | |
6896 | return NULL_TREE; | |
6897 | } | |
6898 | ||
6899 | /* Build the construction vtable group for BINFO which is in the | |
6900 | hierarchy dominated by T. */ | |
6901 | ||
6902 | static void | |
94edc4ab | 6903 | build_ctor_vtbl_group (tree binfo, tree t) |
23656158 MM |
6904 | { |
6905 | tree list; | |
6906 | tree type; | |
6907 | tree vtbl; | |
6908 | tree inits; | |
6909 | tree id; | |
9ccf6541 | 6910 | tree vbase; |
23656158 | 6911 | |
7bdcf888 | 6912 | /* See if we've already created this construction vtable group. */ |
1f84ec23 | 6913 | id = mangle_ctor_vtbl_for_type (t, binfo); |
23656158 MM |
6914 | if (IDENTIFIER_GLOBAL_VALUE (id)) |
6915 | return; | |
6916 | ||
539ed333 | 6917 | gcc_assert (!SAME_BINFO_TYPE_P (BINFO_TYPE (binfo), t)); |
23656158 MM |
6918 | /* Build a version of VTBL (with the wrong type) for use in |
6919 | constructing the addresses of secondary vtables in the | |
6920 | construction vtable group. */ | |
459c43ad | 6921 | vtbl = build_vtable (t, id, ptr_type_node); |
505970fc | 6922 | DECL_CONSTRUCTION_VTABLE_P (vtbl) = 1; |
23656158 MM |
6923 | list = build_tree_list (vtbl, NULL_TREE); |
6924 | accumulate_vtbl_inits (binfo, TYPE_BINFO (TREE_TYPE (binfo)), | |
6925 | binfo, t, list); | |
9965d119 NS |
6926 | |
6927 | /* Add the vtables for each of our virtual bases using the vbase in T | |
6928 | binfo. */ | |
c8094d83 MS |
6929 | for (vbase = TYPE_BINFO (BINFO_TYPE (binfo)); |
6930 | vbase; | |
9ccf6541 MM |
6931 | vbase = TREE_CHAIN (vbase)) |
6932 | { | |
6933 | tree b; | |
6934 | ||
809e3e7f | 6935 | if (!BINFO_VIRTUAL_P (vbase)) |
9ccf6541 | 6936 | continue; |
dbbf88d1 | 6937 | b = copied_binfo (vbase, binfo); |
c8094d83 | 6938 | |
dbbf88d1 | 6939 | accumulate_vtbl_inits (b, vbase, binfo, t, list); |
9ccf6541 | 6940 | } |
99389463 | 6941 | inits = TREE_VALUE (list); |
23656158 MM |
6942 | |
6943 | /* Figure out the type of the construction vtable. */ | |
442e01b6 | 6944 | type = build_index_type (size_int (list_length (inits) - 1)); |
23656158 MM |
6945 | type = build_cplus_array_type (vtable_entry_type, type); |
6946 | TREE_TYPE (vtbl) = type; | |
6947 | ||
6948 | /* Initialize the construction vtable. */ | |
548502d3 | 6949 | CLASSTYPE_VTABLES (t) = chainon (CLASSTYPE_VTABLES (t), vtbl); |
19c29b2f | 6950 | initialize_artificial_var (vtbl, inits); |
b7442fb5 | 6951 | dump_vtable (t, binfo, vtbl); |
23656158 MM |
6952 | } |
6953 | ||
9965d119 NS |
6954 | /* Add the vtbl initializers for BINFO (and its bases other than |
6955 | non-virtual primaries) to the list of INITS. BINFO is in the | |
6956 | hierarchy dominated by T. RTTI_BINFO is the binfo within T of | |
6957 | the constructor the vtbl inits should be accumulated for. (If this | |
6958 | is the complete object vtbl then RTTI_BINFO will be TYPE_BINFO (T).) | |
6959 | ORIG_BINFO is the binfo for this object within BINFO_TYPE (RTTI_BINFO). | |
6960 | BINFO is the active base equivalent of ORIG_BINFO in the inheritance | |
6961 | graph of T. Both BINFO and ORIG_BINFO will have the same BINFO_TYPE, | |
6962 | but are not necessarily the same in terms of layout. */ | |
ca36f057 MM |
6963 | |
6964 | static void | |
94edc4ab | 6965 | accumulate_vtbl_inits (tree binfo, |
0cbd7506 MS |
6966 | tree orig_binfo, |
6967 | tree rtti_binfo, | |
6968 | tree t, | |
6969 | tree inits) | |
ca36f057 | 6970 | { |
23656158 | 6971 | int i; |
fa743e8c | 6972 | tree base_binfo; |
539ed333 | 6973 | int ctor_vtbl_p = !SAME_BINFO_TYPE_P (BINFO_TYPE (rtti_binfo), t); |
23656158 | 6974 | |
539ed333 | 6975 | gcc_assert (SAME_BINFO_TYPE_P (BINFO_TYPE (binfo), BINFO_TYPE (orig_binfo))); |
23656158 | 6976 | |
00a17e31 | 6977 | /* If it doesn't have a vptr, we don't do anything. */ |
623fe76a NS |
6978 | if (!TYPE_CONTAINS_VPTR_P (BINFO_TYPE (binfo))) |
6979 | return; | |
c8094d83 | 6980 | |
23656158 MM |
6981 | /* If we're building a construction vtable, we're not interested in |
6982 | subobjects that don't require construction vtables. */ | |
c8094d83 | 6983 | if (ctor_vtbl_p |
5775a06a | 6984 | && !CLASSTYPE_VBASECLASSES (BINFO_TYPE (binfo)) |
9965d119 | 6985 | && !binfo_via_virtual (orig_binfo, BINFO_TYPE (rtti_binfo))) |
23656158 MM |
6986 | return; |
6987 | ||
6988 | /* Build the initializers for the BINFO-in-T vtable. */ | |
c8094d83 | 6989 | TREE_VALUE (inits) |
23656158 MM |
6990 | = chainon (TREE_VALUE (inits), |
6991 | dfs_accumulate_vtbl_inits (binfo, orig_binfo, | |
6992 | rtti_binfo, t, inits)); | |
c8094d83 | 6993 | |
c35cce41 MM |
6994 | /* Walk the BINFO and its bases. We walk in preorder so that as we |
6995 | initialize each vtable we can figure out at what offset the | |
23656158 MM |
6996 | secondary vtable lies from the primary vtable. We can't use |
6997 | dfs_walk here because we need to iterate through bases of BINFO | |
6998 | and RTTI_BINFO simultaneously. */ | |
fa743e8c | 6999 | for (i = 0; BINFO_BASE_ITERATE (binfo, i, base_binfo); ++i) |
23656158 | 7000 | { |
23656158 | 7001 | /* Skip virtual bases. */ |
809e3e7f | 7002 | if (BINFO_VIRTUAL_P (base_binfo)) |
23656158 MM |
7003 | continue; |
7004 | accumulate_vtbl_inits (base_binfo, | |
604a3205 | 7005 | BINFO_BASE_BINFO (orig_binfo, i), |
9965d119 | 7006 | rtti_binfo, t, |
23656158 MM |
7007 | inits); |
7008 | } | |
ca36f057 MM |
7009 | } |
7010 | ||
3461fba7 NS |
7011 | /* Called from accumulate_vtbl_inits. Returns the initializers for |
7012 | the BINFO vtable. */ | |
ca36f057 MM |
7013 | |
7014 | static tree | |
94edc4ab | 7015 | dfs_accumulate_vtbl_inits (tree binfo, |
0cbd7506 MS |
7016 | tree orig_binfo, |
7017 | tree rtti_binfo, | |
7018 | tree t, | |
7019 | tree l) | |
ca36f057 | 7020 | { |
23656158 | 7021 | tree inits = NULL_TREE; |
9965d119 | 7022 | tree vtbl = NULL_TREE; |
539ed333 | 7023 | int ctor_vtbl_p = !SAME_BINFO_TYPE_P (BINFO_TYPE (rtti_binfo), t); |
9965d119 | 7024 | |
13de7ec4 | 7025 | if (ctor_vtbl_p |
809e3e7f | 7026 | && BINFO_VIRTUAL_P (orig_binfo) && BINFO_PRIMARY_P (orig_binfo)) |
9965d119 | 7027 | { |
13de7ec4 JM |
7028 | /* In the hierarchy of BINFO_TYPE (RTTI_BINFO), this is a |
7029 | primary virtual base. If it is not the same primary in | |
7030 | the hierarchy of T, we'll need to generate a ctor vtable | |
7031 | for it, to place at its location in T. If it is the same | |
7032 | primary, we still need a VTT entry for the vtable, but it | |
7033 | should point to the ctor vtable for the base it is a | |
7034 | primary for within the sub-hierarchy of RTTI_BINFO. | |
c8094d83 | 7035 | |
13de7ec4 | 7036 | There are three possible cases: |
c8094d83 | 7037 | |
13de7ec4 JM |
7038 | 1) We are in the same place. |
7039 | 2) We are a primary base within a lost primary virtual base of | |
7040 | RTTI_BINFO. | |
049d2def | 7041 | 3) We are primary to something not a base of RTTI_BINFO. */ |
c8094d83 | 7042 | |
fc6633e0 | 7043 | tree b; |
13de7ec4 | 7044 | tree last = NULL_TREE; |
85a9a0a2 | 7045 | |
13de7ec4 JM |
7046 | /* First, look through the bases we are primary to for RTTI_BINFO |
7047 | or a virtual base. */ | |
fc6633e0 NS |
7048 | b = binfo; |
7049 | while (BINFO_PRIMARY_P (b)) | |
7bdcf888 | 7050 | { |
fc6633e0 | 7051 | b = BINFO_INHERITANCE_CHAIN (b); |
13de7ec4 | 7052 | last = b; |
809e3e7f | 7053 | if (BINFO_VIRTUAL_P (b) || b == rtti_binfo) |
fc6633e0 | 7054 | goto found; |
7bdcf888 | 7055 | } |
13de7ec4 JM |
7056 | /* If we run out of primary links, keep looking down our |
7057 | inheritance chain; we might be an indirect primary. */ | |
fc6633e0 NS |
7058 | for (b = last; b; b = BINFO_INHERITANCE_CHAIN (b)) |
7059 | if (BINFO_VIRTUAL_P (b) || b == rtti_binfo) | |
7060 | break; | |
7061 | found: | |
c8094d83 | 7062 | |
13de7ec4 JM |
7063 | /* If we found RTTI_BINFO, this is case 1. If we found a virtual |
7064 | base B and it is a base of RTTI_BINFO, this is case 2. In | |
7065 | either case, we share our vtable with LAST, i.e. the | |
7066 | derived-most base within B of which we are a primary. */ | |
7067 | if (b == rtti_binfo | |
58c42dc2 | 7068 | || (b && binfo_for_vbase (BINFO_TYPE (b), BINFO_TYPE (rtti_binfo)))) |
049d2def JM |
7069 | /* Just set our BINFO_VTABLE to point to LAST, as we may not have |
7070 | set LAST's BINFO_VTABLE yet. We'll extract the actual vptr in | |
7071 | binfo_ctor_vtable after everything's been set up. */ | |
7072 | vtbl = last; | |
13de7ec4 | 7073 | |
049d2def | 7074 | /* Otherwise, this is case 3 and we get our own. */ |
9965d119 | 7075 | } |
dbbf88d1 | 7076 | else if (!BINFO_NEW_VTABLE_MARKED (orig_binfo)) |
9965d119 | 7077 | return inits; |
7bdcf888 | 7078 | |
9965d119 | 7079 | if (!vtbl) |
ca36f057 | 7080 | { |
c35cce41 MM |
7081 | tree index; |
7082 | int non_fn_entries; | |
7083 | ||
7084 | /* Compute the initializer for this vtable. */ | |
23656158 | 7085 | inits = build_vtbl_initializer (binfo, orig_binfo, t, rtti_binfo, |
aabb4cd6 | 7086 | &non_fn_entries); |
c35cce41 | 7087 | |
23656158 | 7088 | /* Figure out the position to which the VPTR should point. */ |
c35cce41 | 7089 | vtbl = TREE_PURPOSE (l); |
6de9cd9a | 7090 | vtbl = build1 (ADDR_EXPR, vtbl_ptr_type_node, vtbl); |
c35cce41 MM |
7091 | index = size_binop (PLUS_EXPR, |
7092 | size_int (non_fn_entries), | |
7093 | size_int (list_length (TREE_VALUE (l)))); | |
23656158 MM |
7094 | index = size_binop (MULT_EXPR, |
7095 | TYPE_SIZE_UNIT (vtable_entry_type), | |
7096 | index); | |
f293ce4b | 7097 | vtbl = build2 (PLUS_EXPR, TREE_TYPE (vtbl), vtbl, index); |
9965d119 | 7098 | } |
23656158 | 7099 | |
7bdcf888 | 7100 | if (ctor_vtbl_p) |
9965d119 NS |
7101 | /* For a construction vtable, we can't overwrite BINFO_VTABLE. |
7102 | So, we make a TREE_LIST. Later, dfs_fixup_binfo_vtbls will | |
7103 | straighten this out. */ | |
7104 | BINFO_VTABLE (binfo) = tree_cons (rtti_binfo, vtbl, BINFO_VTABLE (binfo)); | |
809e3e7f | 7105 | else if (BINFO_PRIMARY_P (binfo) && BINFO_VIRTUAL_P (binfo)) |
7bdcf888 NS |
7106 | inits = NULL_TREE; |
7107 | else | |
7108 | /* For an ordinary vtable, set BINFO_VTABLE. */ | |
7109 | BINFO_VTABLE (binfo) = vtbl; | |
ca36f057 | 7110 | |
23656158 | 7111 | return inits; |
ca36f057 MM |
7112 | } |
7113 | ||
1b746b0f AP |
7114 | static GTY(()) tree abort_fndecl_addr; |
7115 | ||
90ecce3e | 7116 | /* Construct the initializer for BINFO's virtual function table. BINFO |
aabb4cd6 | 7117 | is part of the hierarchy dominated by T. If we're building a |
23656158 | 7118 | construction vtable, the ORIG_BINFO is the binfo we should use to |
9965d119 NS |
7119 | find the actual function pointers to put in the vtable - but they |
7120 | can be overridden on the path to most-derived in the graph that | |
7121 | ORIG_BINFO belongs. Otherwise, | |
911a71a7 | 7122 | ORIG_BINFO should be the same as BINFO. The RTTI_BINFO is the |
23656158 MM |
7123 | BINFO that should be indicated by the RTTI information in the |
7124 | vtable; it will be a base class of T, rather than T itself, if we | |
7125 | are building a construction vtable. | |
aabb4cd6 MM |
7126 | |
7127 | The value returned is a TREE_LIST suitable for wrapping in a | |
7128 | CONSTRUCTOR to use as the DECL_INITIAL for a vtable. If | |
7129 | NON_FN_ENTRIES_P is not NULL, *NON_FN_ENTRIES_P is set to the | |
c8094d83 | 7130 | number of non-function entries in the vtable. |
911a71a7 MM |
7131 | |
7132 | It might seem that this function should never be called with a | |
9965d119 | 7133 | BINFO for which BINFO_PRIMARY_P holds, the vtable for such a |
911a71a7 | 7134 | base is always subsumed by a derived class vtable. However, when |
9965d119 | 7135 | we are building construction vtables, we do build vtables for |
911a71a7 MM |
7136 | primary bases; we need these while the primary base is being |
7137 | constructed. */ | |
ca36f057 MM |
7138 | |
7139 | static tree | |
94edc4ab | 7140 | build_vtbl_initializer (tree binfo, |
0cbd7506 MS |
7141 | tree orig_binfo, |
7142 | tree t, | |
7143 | tree rtti_binfo, | |
7144 | int* non_fn_entries_p) | |
ca36f057 | 7145 | { |
d0cd8b44 | 7146 | tree v, b; |
911a71a7 | 7147 | tree vfun_inits; |
911a71a7 | 7148 | vtbl_init_data vid; |
58c42dc2 NS |
7149 | unsigned ix; |
7150 | tree vbinfo; | |
d4e6fecb | 7151 | VEC(tree,gc) *vbases; |
c8094d83 | 7152 | |
911a71a7 | 7153 | /* Initialize VID. */ |
961192e1 | 7154 | memset (&vid, 0, sizeof (vid)); |
911a71a7 MM |
7155 | vid.binfo = binfo; |
7156 | vid.derived = t; | |
73ea87d7 | 7157 | vid.rtti_binfo = rtti_binfo; |
911a71a7 | 7158 | vid.last_init = &vid.inits; |
539ed333 NS |
7159 | vid.primary_vtbl_p = SAME_BINFO_TYPE_P (BINFO_TYPE (binfo), t); |
7160 | vid.ctor_vtbl_p = !SAME_BINFO_TYPE_P (BINFO_TYPE (rtti_binfo), t); | |
548502d3 | 7161 | vid.generate_vcall_entries = true; |
c35cce41 | 7162 | /* The first vbase or vcall offset is at index -3 in the vtable. */ |
ce552f75 | 7163 | vid.index = ssize_int(-3 * TARGET_VTABLE_DATA_ENTRY_DISTANCE); |
c35cce41 | 7164 | |
9bab6c90 | 7165 | /* Add entries to the vtable for RTTI. */ |
73ea87d7 | 7166 | build_rtti_vtbl_entries (binfo, &vid); |
9bab6c90 | 7167 | |
b485e15b MM |
7168 | /* Create an array for keeping track of the functions we've |
7169 | processed. When we see multiple functions with the same | |
7170 | signature, we share the vcall offsets. */ | |
1e625046 | 7171 | vid.fns = VEC_alloc (tree, gc, 32); |
c35cce41 | 7172 | /* Add the vcall and vbase offset entries. */ |
911a71a7 | 7173 | build_vcall_and_vbase_vtbl_entries (binfo, &vid); |
c8094d83 | 7174 | |
79cda2d1 | 7175 | /* Clear BINFO_VTABLE_PATH_MARKED; it's set by |
c35cce41 | 7176 | build_vbase_offset_vtbl_entries. */ |
9ba5ff0f NS |
7177 | for (vbases = CLASSTYPE_VBASECLASSES (t), ix = 0; |
7178 | VEC_iterate (tree, vbases, ix, vbinfo); ix++) | |
58c42dc2 | 7179 | BINFO_VTABLE_PATH_MARKED (vbinfo) = 0; |
ca36f057 | 7180 | |
a6f5e048 RH |
7181 | /* If the target requires padding between data entries, add that now. */ |
7182 | if (TARGET_VTABLE_DATA_ENTRY_DISTANCE > 1) | |
7183 | { | |
7184 | tree cur, *prev; | |
7185 | ||
7186 | for (prev = &vid.inits; (cur = *prev); prev = &TREE_CHAIN (cur)) | |
7187 | { | |
7188 | tree add = cur; | |
7189 | int i; | |
7190 | ||
7191 | for (i = 1; i < TARGET_VTABLE_DATA_ENTRY_DISTANCE; ++i) | |
7befdb9f | 7192 | add = tree_cons (NULL_TREE, |
2e88ae22 SE |
7193 | build1 (NOP_EXPR, vtable_entry_type, |
7194 | null_pointer_node), | |
7befdb9f | 7195 | add); |
a6f5e048 RH |
7196 | *prev = add; |
7197 | } | |
7198 | } | |
7199 | ||
c35cce41 | 7200 | if (non_fn_entries_p) |
911a71a7 | 7201 | *non_fn_entries_p = list_length (vid.inits); |
ca36f057 MM |
7202 | |
7203 | /* Go through all the ordinary virtual functions, building up | |
7204 | initializers. */ | |
c35cce41 | 7205 | vfun_inits = NULL_TREE; |
23656158 | 7206 | for (v = BINFO_VIRTUALS (orig_binfo); v; v = TREE_CHAIN (v)) |
ca36f057 MM |
7207 | { |
7208 | tree delta; | |
7209 | tree vcall_index; | |
4977bab6 | 7210 | tree fn, fn_original; |
f11ee281 | 7211 | tree init = NULL_TREE; |
c8094d83 | 7212 | |
ca36f057 | 7213 | fn = BV_FN (v); |
07fa4878 NS |
7214 | fn_original = fn; |
7215 | if (DECL_THUNK_P (fn)) | |
4977bab6 | 7216 | { |
07fa4878 NS |
7217 | if (!DECL_NAME (fn)) |
7218 | finish_thunk (fn); | |
e00853fd | 7219 | if (THUNK_ALIAS (fn)) |
bb885938 NS |
7220 | { |
7221 | fn = THUNK_ALIAS (fn); | |
7222 | BV_FN (v) = fn; | |
7223 | } | |
07fa4878 | 7224 | fn_original = THUNK_TARGET (fn); |
4977bab6 | 7225 | } |
c8094d83 | 7226 | |
d0cd8b44 JM |
7227 | /* If the only definition of this function signature along our |
7228 | primary base chain is from a lost primary, this vtable slot will | |
7229 | never be used, so just zero it out. This is important to avoid | |
7230 | requiring extra thunks which cannot be generated with the function. | |
7231 | ||
f11ee281 JM |
7232 | We first check this in update_vtable_entry_for_fn, so we handle |
7233 | restored primary bases properly; we also need to do it here so we | |
7234 | zero out unused slots in ctor vtables, rather than filling themff | |
7235 | with erroneous values (though harmless, apart from relocation | |
7236 | costs). */ | |
7237 | for (b = binfo; ; b = get_primary_binfo (b)) | |
7238 | { | |
7239 | /* We found a defn before a lost primary; go ahead as normal. */ | |
4977bab6 | 7240 | if (look_for_overrides_here (BINFO_TYPE (b), fn_original)) |
f11ee281 JM |
7241 | break; |
7242 | ||
7243 | /* The nearest definition is from a lost primary; clear the | |
7244 | slot. */ | |
7245 | if (BINFO_LOST_PRIMARY_P (b)) | |
7246 | { | |
7247 | init = size_zero_node; | |
d0cd8b44 | 7248 | break; |
f11ee281 JM |
7249 | } |
7250 | } | |
d0cd8b44 | 7251 | |
f11ee281 JM |
7252 | if (! init) |
7253 | { | |
7254 | /* Pull the offset for `this', and the function to call, out of | |
7255 | the list. */ | |
7256 | delta = BV_DELTA (v); | |
548502d3 | 7257 | vcall_index = BV_VCALL_INDEX (v); |
f11ee281 | 7258 | |
50bc768d NS |
7259 | gcc_assert (TREE_CODE (delta) == INTEGER_CST); |
7260 | gcc_assert (TREE_CODE (fn) == FUNCTION_DECL); | |
f11ee281 JM |
7261 | |
7262 | /* You can't call an abstract virtual function; it's abstract. | |
7263 | So, we replace these functions with __pure_virtual. */ | |
4977bab6 | 7264 | if (DECL_PURE_VIRTUAL_P (fn_original)) |
4977bab6 | 7265 | { |
1b746b0f AP |
7266 | fn = abort_fndecl; |
7267 | if (abort_fndecl_addr == NULL) | |
7268 | abort_fndecl_addr = build1 (ADDR_EXPR, vfunc_ptr_type_node, fn); | |
7269 | init = abort_fndecl_addr; | |
7270 | } | |
7271 | else | |
7272 | { | |
7273 | if (!integer_zerop (delta) || vcall_index) | |
7274 | { | |
7275 | fn = make_thunk (fn, /*this_adjusting=*/1, delta, vcall_index); | |
7276 | if (!DECL_NAME (fn)) | |
7277 | finish_thunk (fn); | |
7278 | } | |
7279 | /* Take the address of the function, considering it to be of an | |
7280 | appropriate generic type. */ | |
7281 | init = build1 (ADDR_EXPR, vfunc_ptr_type_node, fn); | |
4977bab6 | 7282 | } |
f11ee281 | 7283 | } |
d0cd8b44 | 7284 | |
ca36f057 | 7285 | /* And add it to the chain of initializers. */ |
67231816 RH |
7286 | if (TARGET_VTABLE_USES_DESCRIPTORS) |
7287 | { | |
7288 | int i; | |
7289 | if (init == size_zero_node) | |
7290 | for (i = 0; i < TARGET_VTABLE_USES_DESCRIPTORS; ++i) | |
7291 | vfun_inits = tree_cons (NULL_TREE, init, vfun_inits); | |
7292 | else | |
7293 | for (i = 0; i < TARGET_VTABLE_USES_DESCRIPTORS; ++i) | |
7294 | { | |
f293ce4b RS |
7295 | tree fdesc = build2 (FDESC_EXPR, vfunc_ptr_type_node, |
7296 | TREE_OPERAND (init, 0), | |
7d60be94 | 7297 | build_int_cst (NULL_TREE, i)); |
67231816 | 7298 | TREE_CONSTANT (fdesc) = 1; |
6de9cd9a | 7299 | TREE_INVARIANT (fdesc) = 1; |
67231816 RH |
7300 | |
7301 | vfun_inits = tree_cons (NULL_TREE, fdesc, vfun_inits); | |
7302 | } | |
7303 | } | |
7304 | else | |
0cbd7506 | 7305 | vfun_inits = tree_cons (NULL_TREE, init, vfun_inits); |
ca36f057 MM |
7306 | } |
7307 | ||
c35cce41 MM |
7308 | /* The initializers for virtual functions were built up in reverse |
7309 | order; straighten them out now. */ | |
7310 | vfun_inits = nreverse (vfun_inits); | |
c8094d83 | 7311 | |
9bab6c90 | 7312 | /* The negative offset initializers are also in reverse order. */ |
911a71a7 | 7313 | vid.inits = nreverse (vid.inits); |
9bab6c90 MM |
7314 | |
7315 | /* Chain the two together. */ | |
911a71a7 | 7316 | return chainon (vid.inits, vfun_inits); |
ca36f057 MM |
7317 | } |
7318 | ||
d0cd8b44 | 7319 | /* Adds to vid->inits the initializers for the vbase and vcall |
c35cce41 | 7320 | offsets in BINFO, which is in the hierarchy dominated by T. */ |
ca36f057 | 7321 | |
c35cce41 | 7322 | static void |
94edc4ab | 7323 | build_vcall_and_vbase_vtbl_entries (tree binfo, vtbl_init_data* vid) |
ca36f057 | 7324 | { |
c35cce41 | 7325 | tree b; |
8d08fdba | 7326 | |
c35cce41 | 7327 | /* If this is a derived class, we must first create entries |
9bab6c90 | 7328 | corresponding to the primary base class. */ |
911a71a7 | 7329 | b = get_primary_binfo (binfo); |
c35cce41 | 7330 | if (b) |
911a71a7 | 7331 | build_vcall_and_vbase_vtbl_entries (b, vid); |
c35cce41 MM |
7332 | |
7333 | /* Add the vbase entries for this base. */ | |
911a71a7 | 7334 | build_vbase_offset_vtbl_entries (binfo, vid); |
c35cce41 | 7335 | /* Add the vcall entries for this base. */ |
911a71a7 | 7336 | build_vcall_offset_vtbl_entries (binfo, vid); |
ca36f057 | 7337 | } |
8d08fdba | 7338 | |
ca36f057 MM |
7339 | /* Returns the initializers for the vbase offset entries in the vtable |
7340 | for BINFO (which is part of the class hierarchy dominated by T), in | |
c35cce41 MM |
7341 | reverse order. VBASE_OFFSET_INDEX gives the vtable index |
7342 | where the next vbase offset will go. */ | |
8d08fdba | 7343 | |
c35cce41 | 7344 | static void |
94edc4ab | 7345 | build_vbase_offset_vtbl_entries (tree binfo, vtbl_init_data* vid) |
ca36f057 | 7346 | { |
c35cce41 MM |
7347 | tree vbase; |
7348 | tree t; | |
90b1ca2f | 7349 | tree non_primary_binfo; |
8d08fdba | 7350 | |
ca36f057 MM |
7351 | /* If there are no virtual baseclasses, then there is nothing to |
7352 | do. */ | |
5775a06a | 7353 | if (!CLASSTYPE_VBASECLASSES (BINFO_TYPE (binfo))) |
c35cce41 | 7354 | return; |
ca36f057 | 7355 | |
911a71a7 | 7356 | t = vid->derived; |
c8094d83 | 7357 | |
90b1ca2f NS |
7358 | /* We might be a primary base class. Go up the inheritance hierarchy |
7359 | until we find the most derived class of which we are a primary base: | |
7360 | it is the offset of that which we need to use. */ | |
7361 | non_primary_binfo = binfo; | |
7362 | while (BINFO_INHERITANCE_CHAIN (non_primary_binfo)) | |
7363 | { | |
7364 | tree b; | |
7365 | ||
7366 | /* If we have reached a virtual base, then it must be a primary | |
7367 | base (possibly multi-level) of vid->binfo, or we wouldn't | |
7368 | have called build_vcall_and_vbase_vtbl_entries for it. But it | |
7369 | might be a lost primary, so just skip down to vid->binfo. */ | |
809e3e7f | 7370 | if (BINFO_VIRTUAL_P (non_primary_binfo)) |
90b1ca2f NS |
7371 | { |
7372 | non_primary_binfo = vid->binfo; | |
7373 | break; | |
7374 | } | |
7375 | ||
7376 | b = BINFO_INHERITANCE_CHAIN (non_primary_binfo); | |
7377 | if (get_primary_binfo (b) != non_primary_binfo) | |
7378 | break; | |
7379 | non_primary_binfo = b; | |
7380 | } | |
ca36f057 | 7381 | |
c35cce41 MM |
7382 | /* Go through the virtual bases, adding the offsets. */ |
7383 | for (vbase = TYPE_BINFO (BINFO_TYPE (binfo)); | |
7384 | vbase; | |
7385 | vbase = TREE_CHAIN (vbase)) | |
7386 | { | |
7387 | tree b; | |
7388 | tree delta; | |
c8094d83 | 7389 | |
809e3e7f | 7390 | if (!BINFO_VIRTUAL_P (vbase)) |
c35cce41 | 7391 | continue; |
ca36f057 | 7392 | |
c35cce41 MM |
7393 | /* Find the instance of this virtual base in the complete |
7394 | object. */ | |
dbbf88d1 | 7395 | b = copied_binfo (vbase, binfo); |
c35cce41 MM |
7396 | |
7397 | /* If we've already got an offset for this virtual base, we | |
7398 | don't need another one. */ | |
7399 | if (BINFO_VTABLE_PATH_MARKED (b)) | |
7400 | continue; | |
dbbf88d1 | 7401 | BINFO_VTABLE_PATH_MARKED (b) = 1; |
c35cce41 MM |
7402 | |
7403 | /* Figure out where we can find this vbase offset. */ | |
c8094d83 | 7404 | delta = size_binop (MULT_EXPR, |
911a71a7 | 7405 | vid->index, |
c35cce41 MM |
7406 | convert (ssizetype, |
7407 | TYPE_SIZE_UNIT (vtable_entry_type))); | |
911a71a7 | 7408 | if (vid->primary_vtbl_p) |
c35cce41 MM |
7409 | BINFO_VPTR_FIELD (b) = delta; |
7410 | ||
7411 | if (binfo != TYPE_BINFO (t)) | |
50bc768d NS |
7412 | /* The vbase offset had better be the same. */ |
7413 | gcc_assert (tree_int_cst_equal (delta, BINFO_VPTR_FIELD (vbase))); | |
c35cce41 MM |
7414 | |
7415 | /* The next vbase will come at a more negative offset. */ | |
a6f5e048 RH |
7416 | vid->index = size_binop (MINUS_EXPR, vid->index, |
7417 | ssize_int (TARGET_VTABLE_DATA_ENTRY_DISTANCE)); | |
c35cce41 MM |
7418 | |
7419 | /* The initializer is the delta from BINFO to this virtual base. | |
4e7512c9 MM |
7420 | The vbase offsets go in reverse inheritance-graph order, and |
7421 | we are walking in inheritance graph order so these end up in | |
7422 | the right order. */ | |
90b1ca2f | 7423 | delta = size_diffop (BINFO_OFFSET (b), BINFO_OFFSET (non_primary_binfo)); |
c8094d83 MS |
7424 | |
7425 | *vid->last_init | |
9bab6c90 | 7426 | = build_tree_list (NULL_TREE, |
c8094d83 | 7427 | fold_build1 (NOP_EXPR, |
7866705a SB |
7428 | vtable_entry_type, |
7429 | delta)); | |
911a71a7 | 7430 | vid->last_init = &TREE_CHAIN (*vid->last_init); |
c35cce41 | 7431 | } |
8d08fdba | 7432 | } |
ca36f057 | 7433 | |
b485e15b | 7434 | /* Adds the initializers for the vcall offset entries in the vtable |
d0cd8b44 JM |
7435 | for BINFO (which is part of the class hierarchy dominated by VID->DERIVED) |
7436 | to VID->INITS. */ | |
b485e15b MM |
7437 | |
7438 | static void | |
94edc4ab | 7439 | build_vcall_offset_vtbl_entries (tree binfo, vtbl_init_data* vid) |
b485e15b | 7440 | { |
548502d3 MM |
7441 | /* We only need these entries if this base is a virtual base. We |
7442 | compute the indices -- but do not add to the vtable -- when | |
7443 | building the main vtable for a class. */ | |
809e3e7f | 7444 | if (BINFO_VIRTUAL_P (binfo) || binfo == TYPE_BINFO (vid->derived)) |
548502d3 MM |
7445 | { |
7446 | /* We need a vcall offset for each of the virtual functions in this | |
7447 | vtable. For example: | |
b485e15b | 7448 | |
548502d3 MM |
7449 | class A { virtual void f (); }; |
7450 | class B1 : virtual public A { virtual void f (); }; | |
7451 | class B2 : virtual public A { virtual void f (); }; | |
7452 | class C: public B1, public B2 { virtual void f (); }; | |
d0cd8b44 | 7453 | |
548502d3 MM |
7454 | A C object has a primary base of B1, which has a primary base of A. A |
7455 | C also has a secondary base of B2, which no longer has a primary base | |
7456 | of A. So the B2-in-C construction vtable needs a secondary vtable for | |
7457 | A, which will adjust the A* to a B2* to call f. We have no way of | |
7458 | knowing what (or even whether) this offset will be when we define B2, | |
7459 | so we store this "vcall offset" in the A sub-vtable and look it up in | |
7460 | a "virtual thunk" for B2::f. | |
b485e15b | 7461 | |
548502d3 MM |
7462 | We need entries for all the functions in our primary vtable and |
7463 | in our non-virtual bases' secondary vtables. */ | |
7464 | vid->vbase = binfo; | |
7465 | /* If we are just computing the vcall indices -- but do not need | |
7466 | the actual entries -- not that. */ | |
809e3e7f | 7467 | if (!BINFO_VIRTUAL_P (binfo)) |
548502d3 MM |
7468 | vid->generate_vcall_entries = false; |
7469 | /* Now, walk through the non-virtual bases, adding vcall offsets. */ | |
7470 | add_vcall_offset_vtbl_entries_r (binfo, vid); | |
7471 | } | |
b485e15b MM |
7472 | } |
7473 | ||
7474 | /* Build vcall offsets, starting with those for BINFO. */ | |
7475 | ||
7476 | static void | |
94edc4ab | 7477 | add_vcall_offset_vtbl_entries_r (tree binfo, vtbl_init_data* vid) |
b485e15b MM |
7478 | { |
7479 | int i; | |
7480 | tree primary_binfo; | |
fa743e8c | 7481 | tree base_binfo; |
b485e15b MM |
7482 | |
7483 | /* Don't walk into virtual bases -- except, of course, for the | |
d0cd8b44 JM |
7484 | virtual base for which we are building vcall offsets. Any |
7485 | primary virtual base will have already had its offsets generated | |
7486 | through the recursion in build_vcall_and_vbase_vtbl_entries. */ | |
809e3e7f | 7487 | if (BINFO_VIRTUAL_P (binfo) && vid->vbase != binfo) |
b485e15b | 7488 | return; |
c8094d83 | 7489 | |
b485e15b MM |
7490 | /* If BINFO has a primary base, process it first. */ |
7491 | primary_binfo = get_primary_binfo (binfo); | |
7492 | if (primary_binfo) | |
7493 | add_vcall_offset_vtbl_entries_r (primary_binfo, vid); | |
7494 | ||
7495 | /* Add BINFO itself to the list. */ | |
7496 | add_vcall_offset_vtbl_entries_1 (binfo, vid); | |
7497 | ||
7498 | /* Scan the non-primary bases of BINFO. */ | |
fa743e8c NS |
7499 | for (i = 0; BINFO_BASE_ITERATE (binfo, i, base_binfo); ++i) |
7500 | if (base_binfo != primary_binfo) | |
7501 | add_vcall_offset_vtbl_entries_r (base_binfo, vid); | |
b485e15b MM |
7502 | } |
7503 | ||
9965d119 | 7504 | /* Called from build_vcall_offset_vtbl_entries_r. */ |
e92cc029 | 7505 | |
b485e15b | 7506 | static void |
94edc4ab | 7507 | add_vcall_offset_vtbl_entries_1 (tree binfo, vtbl_init_data* vid) |
8d08fdba | 7508 | { |
e6a66567 MM |
7509 | /* Make entries for the rest of the virtuals. */ |
7510 | if (abi_version_at_least (2)) | |
31f8e4f3 | 7511 | { |
e6a66567 | 7512 | tree orig_fn; |
911a71a7 | 7513 | |
e6a66567 MM |
7514 | /* The ABI requires that the methods be processed in declaration |
7515 | order. G++ 3.2 used the order in the vtable. */ | |
7516 | for (orig_fn = TYPE_METHODS (BINFO_TYPE (binfo)); | |
7517 | orig_fn; | |
7518 | orig_fn = TREE_CHAIN (orig_fn)) | |
7519 | if (DECL_VINDEX (orig_fn)) | |
95675950 | 7520 | add_vcall_offset (orig_fn, binfo, vid); |
e6a66567 MM |
7521 | } |
7522 | else | |
7523 | { | |
7524 | tree derived_virtuals; | |
7525 | tree base_virtuals; | |
7526 | tree orig_virtuals; | |
7527 | /* If BINFO is a primary base, the most derived class which has | |
7528 | BINFO as a primary base; otherwise, just BINFO. */ | |
7529 | tree non_primary_binfo; | |
7530 | ||
7531 | /* We might be a primary base class. Go up the inheritance hierarchy | |
7532 | until we find the most derived class of which we are a primary base: | |
7533 | it is the BINFO_VIRTUALS there that we need to consider. */ | |
7534 | non_primary_binfo = binfo; | |
7535 | while (BINFO_INHERITANCE_CHAIN (non_primary_binfo)) | |
911a71a7 | 7536 | { |
e6a66567 MM |
7537 | tree b; |
7538 | ||
7539 | /* If we have reached a virtual base, then it must be vid->vbase, | |
7540 | because we ignore other virtual bases in | |
7541 | add_vcall_offset_vtbl_entries_r. In turn, it must be a primary | |
7542 | base (possibly multi-level) of vid->binfo, or we wouldn't | |
7543 | have called build_vcall_and_vbase_vtbl_entries for it. But it | |
7544 | might be a lost primary, so just skip down to vid->binfo. */ | |
809e3e7f | 7545 | if (BINFO_VIRTUAL_P (non_primary_binfo)) |
e6a66567 | 7546 | { |
8dc2b103 | 7547 | gcc_assert (non_primary_binfo == vid->vbase); |
e6a66567 MM |
7548 | non_primary_binfo = vid->binfo; |
7549 | break; | |
7550 | } | |
911a71a7 | 7551 | |
e6a66567 MM |
7552 | b = BINFO_INHERITANCE_CHAIN (non_primary_binfo); |
7553 | if (get_primary_binfo (b) != non_primary_binfo) | |
7554 | break; | |
7555 | non_primary_binfo = b; | |
7556 | } | |
4e7512c9 | 7557 | |
e6a66567 MM |
7558 | if (vid->ctor_vtbl_p) |
7559 | /* For a ctor vtable we need the equivalent binfo within the hierarchy | |
7560 | where rtti_binfo is the most derived type. */ | |
dbbf88d1 NS |
7561 | non_primary_binfo |
7562 | = original_binfo (non_primary_binfo, vid->rtti_binfo); | |
c8094d83 | 7563 | |
e6a66567 MM |
7564 | for (base_virtuals = BINFO_VIRTUALS (binfo), |
7565 | derived_virtuals = BINFO_VIRTUALS (non_primary_binfo), | |
7566 | orig_virtuals = BINFO_VIRTUALS (TYPE_BINFO (BINFO_TYPE (binfo))); | |
7567 | base_virtuals; | |
7568 | base_virtuals = TREE_CHAIN (base_virtuals), | |
7569 | derived_virtuals = TREE_CHAIN (derived_virtuals), | |
7570 | orig_virtuals = TREE_CHAIN (orig_virtuals)) | |
7571 | { | |
7572 | tree orig_fn; | |
73ea87d7 | 7573 | |
e6a66567 MM |
7574 | /* Find the declaration that originally caused this function to |
7575 | be present in BINFO_TYPE (binfo). */ | |
7576 | orig_fn = BV_FN (orig_virtuals); | |
9bab6c90 | 7577 | |
e6a66567 MM |
7578 | /* When processing BINFO, we only want to generate vcall slots for |
7579 | function slots introduced in BINFO. So don't try to generate | |
7580 | one if the function isn't even defined in BINFO. */ | |
539ed333 | 7581 | if (!SAME_BINFO_TYPE_P (BINFO_TYPE (binfo), DECL_CONTEXT (orig_fn))) |
e6a66567 | 7582 | continue; |
b485e15b | 7583 | |
95675950 | 7584 | add_vcall_offset (orig_fn, binfo, vid); |
e6a66567 MM |
7585 | } |
7586 | } | |
7587 | } | |
b485e15b | 7588 | |
95675950 | 7589 | /* Add a vcall offset entry for ORIG_FN to the vtable. */ |
b485e15b | 7590 | |
e6a66567 | 7591 | static void |
95675950 | 7592 | add_vcall_offset (tree orig_fn, tree binfo, vtbl_init_data *vid) |
e6a66567 MM |
7593 | { |
7594 | size_t i; | |
7595 | tree vcall_offset; | |
1e625046 | 7596 | tree derived_entry; |
9bab6c90 | 7597 | |
e6a66567 MM |
7598 | /* If there is already an entry for a function with the same |
7599 | signature as FN, then we do not need a second vcall offset. | |
7600 | Check the list of functions already present in the derived | |
7601 | class vtable. */ | |
c8094d83 | 7602 | for (i = 0; VEC_iterate (tree, vid->fns, i, derived_entry); ++i) |
e6a66567 | 7603 | { |
e6a66567 MM |
7604 | if (same_signature_p (derived_entry, orig_fn) |
7605 | /* We only use one vcall offset for virtual destructors, | |
7606 | even though there are two virtual table entries. */ | |
7607 | || (DECL_DESTRUCTOR_P (derived_entry) | |
7608 | && DECL_DESTRUCTOR_P (orig_fn))) | |
7609 | return; | |
7610 | } | |
4e7512c9 | 7611 | |
e6a66567 MM |
7612 | /* If we are building these vcall offsets as part of building |
7613 | the vtable for the most derived class, remember the vcall | |
7614 | offset. */ | |
7615 | if (vid->binfo == TYPE_BINFO (vid->derived)) | |
0871761b | 7616 | { |
d4e6fecb | 7617 | tree_pair_p elt = VEC_safe_push (tree_pair_s, gc, |
0871761b NS |
7618 | CLASSTYPE_VCALL_INDICES (vid->derived), |
7619 | NULL); | |
7620 | elt->purpose = orig_fn; | |
7621 | elt->value = vid->index; | |
7622 | } | |
c8094d83 | 7623 | |
e6a66567 MM |
7624 | /* The next vcall offset will be found at a more negative |
7625 | offset. */ | |
7626 | vid->index = size_binop (MINUS_EXPR, vid->index, | |
7627 | ssize_int (TARGET_VTABLE_DATA_ENTRY_DISTANCE)); | |
7628 | ||
7629 | /* Keep track of this function. */ | |
1e625046 | 7630 | VEC_safe_push (tree, gc, vid->fns, orig_fn); |
e6a66567 MM |
7631 | |
7632 | if (vid->generate_vcall_entries) | |
7633 | { | |
7634 | tree base; | |
e6a66567 | 7635 | tree fn; |
548502d3 | 7636 | |
e6a66567 | 7637 | /* Find the overriding function. */ |
95675950 | 7638 | fn = find_final_overrider (vid->rtti_binfo, binfo, orig_fn); |
e6a66567 MM |
7639 | if (fn == error_mark_node) |
7640 | vcall_offset = build1 (NOP_EXPR, vtable_entry_type, | |
7641 | integer_zero_node); | |
7642 | else | |
7643 | { | |
95675950 MM |
7644 | base = TREE_VALUE (fn); |
7645 | ||
7646 | /* The vbase we're working on is a primary base of | |
7647 | vid->binfo. But it might be a lost primary, so its | |
7648 | BINFO_OFFSET might be wrong, so we just use the | |
7649 | BINFO_OFFSET from vid->binfo. */ | |
7650 | vcall_offset = size_diffop (BINFO_OFFSET (base), | |
7651 | BINFO_OFFSET (vid->binfo)); | |
7866705a SB |
7652 | vcall_offset = fold_build1 (NOP_EXPR, vtable_entry_type, |
7653 | vcall_offset); | |
548502d3 | 7654 | } |
34cd5ae7 | 7655 | /* Add the initializer to the vtable. */ |
e6a66567 MM |
7656 | *vid->last_init = build_tree_list (NULL_TREE, vcall_offset); |
7657 | vid->last_init = &TREE_CHAIN (*vid->last_init); | |
c35cce41 | 7658 | } |
570221c2 | 7659 | } |
b54ccf71 | 7660 | |
34cd5ae7 | 7661 | /* Return vtbl initializers for the RTTI entries corresponding to the |
aabb4cd6 | 7662 | BINFO's vtable. The RTTI entries should indicate the object given |
73ea87d7 | 7663 | by VID->rtti_binfo. */ |
b54ccf71 | 7664 | |
9bab6c90 | 7665 | static void |
94edc4ab | 7666 | build_rtti_vtbl_entries (tree binfo, vtbl_init_data* vid) |
b54ccf71 | 7667 | { |
ca36f057 | 7668 | tree b; |
aabb4cd6 | 7669 | tree t; |
ca36f057 | 7670 | tree basetype; |
ca36f057 MM |
7671 | tree offset; |
7672 | tree decl; | |
7673 | tree init; | |
b54ccf71 | 7674 | |
ca36f057 | 7675 | basetype = BINFO_TYPE (binfo); |
73ea87d7 | 7676 | t = BINFO_TYPE (vid->rtti_binfo); |
b54ccf71 | 7677 | |
ca36f057 MM |
7678 | /* To find the complete object, we will first convert to our most |
7679 | primary base, and then add the offset in the vtbl to that value. */ | |
7680 | b = binfo; | |
9965d119 | 7681 | while (CLASSTYPE_HAS_PRIMARY_BASE_P (BINFO_TYPE (b)) |
0cbd7506 | 7682 | && !BINFO_LOST_PRIMARY_P (b)) |
b54ccf71 | 7683 | { |
c35cce41 MM |
7684 | tree primary_base; |
7685 | ||
911a71a7 | 7686 | primary_base = get_primary_binfo (b); |
fc6633e0 NS |
7687 | gcc_assert (BINFO_PRIMARY_P (primary_base) |
7688 | && BINFO_INHERITANCE_CHAIN (primary_base) == b); | |
c35cce41 | 7689 | b = primary_base; |
b54ccf71 | 7690 | } |
73ea87d7 | 7691 | offset = size_diffop (BINFO_OFFSET (vid->rtti_binfo), BINFO_OFFSET (b)); |
8f032717 | 7692 | |
8fa33dfa MM |
7693 | /* The second entry is the address of the typeinfo object. */ |
7694 | if (flag_rtti) | |
7993382e | 7695 | decl = build_address (get_tinfo_decl (t)); |
ca36f057 | 7696 | else |
8fa33dfa | 7697 | decl = integer_zero_node; |
c8094d83 | 7698 | |
8fa33dfa MM |
7699 | /* Convert the declaration to a type that can be stored in the |
7700 | vtable. */ | |
7993382e | 7701 | init = build_nop (vfunc_ptr_type_node, decl); |
911a71a7 MM |
7702 | *vid->last_init = build_tree_list (NULL_TREE, init); |
7703 | vid->last_init = &TREE_CHAIN (*vid->last_init); | |
8f032717 | 7704 | |
78dcd41a VR |
7705 | /* Add the offset-to-top entry. It comes earlier in the vtable than |
7706 | the typeinfo entry. Convert the offset to look like a | |
c4372ef4 | 7707 | function pointer, so that we can put it in the vtable. */ |
7993382e | 7708 | init = build_nop (vfunc_ptr_type_node, offset); |
c4372ef4 NS |
7709 | *vid->last_init = build_tree_list (NULL_TREE, init); |
7710 | vid->last_init = &TREE_CHAIN (*vid->last_init); | |
8f032717 | 7711 | } |
0f59171d RH |
7712 | |
7713 | /* Fold a OBJ_TYPE_REF expression to the address of a function. | |
7714 | KNOWN_TYPE carries the true type of OBJ_TYPE_REF_OBJECT(REF). */ | |
7715 | ||
7716 | tree | |
7717 | cp_fold_obj_type_ref (tree ref, tree known_type) | |
7718 | { | |
7719 | HOST_WIDE_INT index = tree_low_cst (OBJ_TYPE_REF_TOKEN (ref), 1); | |
7720 | HOST_WIDE_INT i = 0; | |
604a3205 | 7721 | tree v = BINFO_VIRTUALS (TYPE_BINFO (known_type)); |
0f59171d RH |
7722 | tree fndecl; |
7723 | ||
7724 | while (i != index) | |
7725 | { | |
7726 | i += (TARGET_VTABLE_USES_DESCRIPTORS | |
7727 | ? TARGET_VTABLE_USES_DESCRIPTORS : 1); | |
7728 | v = TREE_CHAIN (v); | |
7729 | } | |
7730 | ||
7731 | fndecl = BV_FN (v); | |
7732 | ||
7733 | #ifdef ENABLE_CHECKING | |
8dc2b103 NS |
7734 | gcc_assert (tree_int_cst_equal (OBJ_TYPE_REF_TOKEN (ref), |
7735 | DECL_VINDEX (fndecl))); | |
0f59171d RH |
7736 | #endif |
7737 | ||
8634c649 JJ |
7738 | cgraph_node (fndecl)->local.vtable_method = true; |
7739 | ||
0f59171d RH |
7740 | return build_address (fndecl); |
7741 | } | |
d7afec4b | 7742 | |
1b746b0f | 7743 | #include "gt-cp-class.h" |