]>
Commit | Line | Data |
---|---|---|
8d08fdba | 1 | /* Functions related to building classes and their related objects. |
06ceef4e | 2 | Copyright (C) 1987, 1992, 1993, 1994, 1995, 1996, 1997, 1998, |
66647d44 | 3 | 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2007, 2008, 2009 |
fc40d49c | 4 | Free Software Foundation, Inc. |
8d08fdba MS |
5 | Contributed by Michael Tiemann (tiemann@cygnus.com) |
6 | ||
f5adbb8d | 7 | This file is part of GCC. |
8d08fdba | 8 | |
f5adbb8d | 9 | GCC is free software; you can redistribute it and/or modify |
8d08fdba | 10 | it under the terms of the GNU General Public License as published by |
e77f031d | 11 | the Free Software Foundation; either version 3, or (at your option) |
8d08fdba MS |
12 | any later version. |
13 | ||
f5adbb8d | 14 | GCC is distributed in the hope that it will be useful, |
8d08fdba MS |
15 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
16 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 | GNU General Public License for more details. | |
18 | ||
19 | You should have received a copy of the GNU General Public License | |
e77f031d NC |
20 | along with GCC; see the file COPYING3. If not see |
21 | <http://www.gnu.org/licenses/>. */ | |
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; | |
c888c93b MM |
63 | |
64 | /* Nonzero if this class is no longer open, because of a call to | |
65 | push_to_top_level. */ | |
66 | size_t hidden; | |
61a127b3 MM |
67 | }* class_stack_node_t; |
68 | ||
911a71a7 | 69 | typedef struct vtbl_init_data_s |
c35cce41 | 70 | { |
911a71a7 MM |
71 | /* The base for which we're building initializers. */ |
72 | tree binfo; | |
73ea87d7 | 73 | /* The type of the most-derived type. */ |
c35cce41 | 74 | tree derived; |
73ea87d7 NS |
75 | /* The binfo for the dynamic type. This will be TYPE_BINFO (derived), |
76 | unless ctor_vtbl_p is true. */ | |
77 | tree rtti_binfo; | |
9bab6c90 MM |
78 | /* The negative-index vtable initializers built up so far. These |
79 | are in order from least negative index to most negative index. */ | |
80 | tree inits; | |
d0cd8b44 | 81 | /* The last (i.e., most negative) entry in INITS. */ |
9bab6c90 | 82 | tree* last_init; |
c35cce41 | 83 | /* The binfo for the virtual base for which we're building |
911a71a7 | 84 | vcall offset initializers. */ |
c35cce41 | 85 | tree vbase; |
9bab6c90 MM |
86 | /* The functions in vbase for which we have already provided vcall |
87 | offsets. */ | |
1e625046 | 88 | VEC(tree,gc) *fns; |
c35cce41 MM |
89 | /* The vtable index of the next vcall or vbase offset. */ |
90 | tree index; | |
91 | /* Nonzero if we are building the initializer for the primary | |
92 | vtable. */ | |
911a71a7 MM |
93 | int primary_vtbl_p; |
94 | /* Nonzero if we are building the initializer for a construction | |
95 | vtable. */ | |
96 | int ctor_vtbl_p; | |
548502d3 MM |
97 | /* True when adding vcall offset entries to the vtable. False when |
98 | merely computing the indices. */ | |
99 | bool generate_vcall_entries; | |
911a71a7 | 100 | } vtbl_init_data; |
c35cce41 | 101 | |
c20118a8 | 102 | /* The type of a function passed to walk_subobject_offsets. */ |
94edc4ab | 103 | typedef int (*subobject_offset_fn) (tree, tree, splay_tree); |
c20118a8 | 104 | |
4639c5c6 | 105 | /* The stack itself. This is a dynamically resized array. The |
61a127b3 MM |
106 | number of elements allocated is CURRENT_CLASS_STACK_SIZE. */ |
107 | static int current_class_stack_size; | |
108 | static class_stack_node_t current_class_stack; | |
109 | ||
c5a35c3c MM |
110 | /* The size of the largest empty class seen in this translation unit. */ |
111 | static GTY (()) tree sizeof_biggest_empty_class; | |
112 | ||
1f6e1acc AS |
113 | /* An array of all local classes present in this translation unit, in |
114 | declaration order. */ | |
806aa901 | 115 | VEC(tree,gc) *local_classes; |
1f6e1acc | 116 | |
94edc4ab NN |
117 | static tree get_vfield_name (tree); |
118 | static void finish_struct_anon (tree); | |
119 | static tree get_vtable_name (tree); | |
120 | static tree get_basefndecls (tree, tree); | |
121 | static int build_primary_vtable (tree, tree); | |
dbbf88d1 | 122 | static int build_secondary_vtable (tree); |
94edc4ab NN |
123 | static void finish_vtbls (tree); |
124 | static void modify_vtable_entry (tree, tree, tree, tree, tree *); | |
94edc4ab NN |
125 | static void finish_struct_bits (tree); |
126 | static int alter_access (tree, tree, tree); | |
127 | static void handle_using_decl (tree, tree); | |
94edc4ab NN |
128 | static tree dfs_modify_vtables (tree, void *); |
129 | static tree modify_all_vtables (tree, tree); | |
fc6633e0 | 130 | static void determine_primary_bases (tree); |
94edc4ab NN |
131 | static void finish_struct_methods (tree); |
132 | static void maybe_warn_about_overly_private_class (tree); | |
94edc4ab NN |
133 | static int method_name_cmp (const void *, const void *); |
134 | static int resort_method_name_cmp (const void *, const void *); | |
e5e459bf | 135 | static void add_implicitly_declared_members (tree, int, int); |
94edc4ab | 136 | static tree fixed_type_or_null (tree, int *, int *); |
00bfffa4 | 137 | static tree build_simple_base_path (tree expr, tree binfo); |
94edc4ab NN |
138 | static tree build_vtbl_ref_1 (tree, tree); |
139 | static tree build_vtbl_initializer (tree, tree, tree, tree, int *); | |
140 | static int count_fields (tree); | |
d07605f5 | 141 | static int add_fields_to_record_type (tree, struct sorted_fields_type*, int); |
e7df0180 | 142 | static bool check_bitfield_decl (tree); |
e5e459bf AO |
143 | static void check_field_decl (tree, tree, int *, int *, int *); |
144 | static void check_field_decls (tree, tree *, int *, int *); | |
58731fd1 MM |
145 | static tree *build_base_field (record_layout_info, tree, splay_tree, tree *); |
146 | static void build_base_fields (record_layout_info, splay_tree, tree *); | |
94edc4ab NN |
147 | static void check_methods (tree); |
148 | static void remove_zero_width_bit_fields (tree); | |
e5e459bf | 149 | static void check_bases (tree, int *, int *); |
58731fd1 MM |
150 | static void check_bases_and_members (tree); |
151 | static tree create_vtable_ptr (tree, tree *); | |
17bbb839 | 152 | static void include_empty_classes (record_layout_info); |
e93ee644 | 153 | static void layout_class_type (tree, tree *); |
94edc4ab NN |
154 | static void fixup_pending_inline (tree); |
155 | static void fixup_inline_methods (tree); | |
dbbf88d1 | 156 | static void propagate_binfo_offsets (tree, tree); |
17bbb839 | 157 | static void layout_virtual_bases (record_layout_info, splay_tree); |
94edc4ab NN |
158 | static void build_vbase_offset_vtbl_entries (tree, vtbl_init_data *); |
159 | static void add_vcall_offset_vtbl_entries_r (tree, vtbl_init_data *); | |
160 | static void add_vcall_offset_vtbl_entries_1 (tree, vtbl_init_data *); | |
161 | static void build_vcall_offset_vtbl_entries (tree, vtbl_init_data *); | |
e6a66567 | 162 | static void add_vcall_offset (tree, tree, vtbl_init_data *); |
94edc4ab | 163 | static void layout_vtable_decl (tree, int); |
5d5a519f | 164 | static tree dfs_find_final_overrider_pre (tree, void *); |
dbbf88d1 | 165 | static tree dfs_find_final_overrider_post (tree, void *); |
94edc4ab NN |
166 | static tree find_final_overrider (tree, tree, tree); |
167 | static int make_new_vtable (tree, tree); | |
b5791fdc | 168 | static tree get_primary_binfo (tree); |
94edc4ab | 169 | static int maybe_indent_hierarchy (FILE *, int, int); |
dbbf88d1 | 170 | static tree dump_class_hierarchy_r (FILE *, int, tree, tree, int); |
94edc4ab | 171 | static void dump_class_hierarchy (tree); |
bb885938 | 172 | static void dump_class_hierarchy_1 (FILE *, int, tree); |
94edc4ab NN |
173 | static void dump_array (FILE *, tree); |
174 | static void dump_vtable (tree, tree, tree); | |
175 | static void dump_vtt (tree, tree); | |
bb885938 | 176 | static void dump_thunk (FILE *, int, tree); |
94edc4ab NN |
177 | static tree build_vtable (tree, tree, tree); |
178 | static void initialize_vtable (tree, tree); | |
94edc4ab | 179 | static void layout_nonempty_base_or_field (record_layout_info, |
5d5a519f | 180 | tree, tree, splay_tree); |
94edc4ab | 181 | static tree end_of_class (tree, int); |
d9d9dbc0 | 182 | static bool layout_empty_base (record_layout_info, tree, tree, splay_tree); |
94edc4ab NN |
183 | static void accumulate_vtbl_inits (tree, tree, tree, tree, tree); |
184 | static tree dfs_accumulate_vtbl_inits (tree, tree, tree, tree, | |
185 | tree); | |
186 | static void build_rtti_vtbl_entries (tree, vtbl_init_data *); | |
5d5a519f | 187 | static void build_vcall_and_vbase_vtbl_entries (tree, vtbl_init_data *); |
94edc4ab NN |
188 | static void clone_constructors_and_destructors (tree); |
189 | static tree build_clone (tree, tree); | |
a2ddc397 | 190 | static void update_vtable_entry_for_fn (tree, tree, tree, tree *, unsigned); |
94edc4ab NN |
191 | static void build_ctor_vtbl_group (tree, tree); |
192 | static void build_vtt (tree); | |
193 | static tree binfo_ctor_vtable (tree); | |
194 | static tree *build_vtt_inits (tree, tree, tree *, tree *); | |
195 | static tree dfs_build_secondary_vptr_vtt_inits (tree, void *); | |
94edc4ab | 196 | static tree dfs_fixup_binfo_vtbls (tree, void *); |
94edc4ab NN |
197 | static int record_subobject_offset (tree, tree, splay_tree); |
198 | static int check_subobject_offset (tree, tree, splay_tree); | |
199 | static int walk_subobject_offsets (tree, subobject_offset_fn, | |
5d5a519f | 200 | tree, splay_tree, tree, int); |
c5a35c3c | 201 | static void record_subobject_offsets (tree, tree, splay_tree, bool); |
94edc4ab NN |
202 | static int layout_conflict_p (tree, tree, splay_tree, int); |
203 | static int splay_tree_compare_integer_csts (splay_tree_key k1, | |
5d5a519f | 204 | splay_tree_key k2); |
94edc4ab NN |
205 | static void warn_about_ambiguous_bases (tree); |
206 | static bool type_requires_array_cookie (tree); | |
956d9305 | 207 | static bool contains_empty_class_p (tree); |
9368208b | 208 | static bool base_derived_from (tree, tree); |
7ba539c6 | 209 | static int empty_base_at_nonzero_offset_p (tree, tree, splay_tree); |
ba9a991f | 210 | static tree end_of_base (tree); |
548502d3 | 211 | static tree get_vcall_index (tree, tree); |
9965d119 | 212 | |
51c184be | 213 | /* Variables shared between class.c and call.c. */ |
8d08fdba | 214 | |
5566b478 | 215 | #ifdef GATHER_STATISTICS |
8d08fdba MS |
216 | int n_vtables = 0; |
217 | int n_vtable_entries = 0; | |
218 | int n_vtable_searches = 0; | |
219 | int n_vtable_elems = 0; | |
220 | int n_convert_harshness = 0; | |
221 | int n_compute_conversion_costs = 0; | |
8d08fdba | 222 | int n_inner_fields_searched = 0; |
5566b478 | 223 | #endif |
8d08fdba | 224 | |
338d90b8 NS |
225 | /* Convert to or from a base subobject. EXPR is an expression of type |
226 | `A' or `A*', an expression of type `B' or `B*' is returned. To | |
227 | convert A to a base B, CODE is PLUS_EXPR and BINFO is the binfo for | |
228 | the B base instance within A. To convert base A to derived B, CODE | |
229 | is MINUS_EXPR and BINFO is the binfo for the A instance within B. | |
230 | In this latter case, A must not be a morally virtual base of B. | |
231 | NONNULL is true if EXPR is known to be non-NULL (this is only | |
232 | needed when EXPR is of pointer type). CV qualifiers are preserved | |
233 | from EXPR. */ | |
ca36f057 MM |
234 | |
235 | tree | |
94edc4ab | 236 | build_base_path (enum tree_code code, |
0cbd7506 MS |
237 | tree expr, |
238 | tree binfo, | |
239 | int nonnull) | |
1a588ad7 | 240 | { |
338d90b8 | 241 | tree v_binfo = NULL_TREE; |
6bc34b14 | 242 | tree d_binfo = NULL_TREE; |
338d90b8 NS |
243 | tree probe; |
244 | tree offset; | |
245 | tree target_type; | |
246 | tree null_test = NULL; | |
247 | tree ptr_target_type; | |
ca36f057 | 248 | int fixed_type_p; |
338d90b8 | 249 | int want_pointer = TREE_CODE (TREE_TYPE (expr)) == POINTER_TYPE; |
00bfffa4 | 250 | bool has_empty = false; |
d7981fd9 | 251 | bool virtual_access; |
1a588ad7 | 252 | |
338d90b8 NS |
253 | if (expr == error_mark_node || binfo == error_mark_node || !binfo) |
254 | return error_mark_node; | |
6bc34b14 JM |
255 | |
256 | for (probe = binfo; probe; probe = BINFO_INHERITANCE_CHAIN (probe)) | |
257 | { | |
258 | d_binfo = probe; | |
00bfffa4 JM |
259 | if (is_empty_class (BINFO_TYPE (probe))) |
260 | has_empty = true; | |
809e3e7f | 261 | if (!v_binfo && BINFO_VIRTUAL_P (probe)) |
6bc34b14 JM |
262 | v_binfo = probe; |
263 | } | |
338d90b8 NS |
264 | |
265 | probe = TYPE_MAIN_VARIANT (TREE_TYPE (expr)); | |
266 | if (want_pointer) | |
267 | probe = TYPE_MAIN_VARIANT (TREE_TYPE (probe)); | |
00bfffa4 | 268 | |
539ed333 NS |
269 | gcc_assert ((code == MINUS_EXPR |
270 | && SAME_BINFO_TYPE_P (BINFO_TYPE (binfo), probe)) | |
271 | || (code == PLUS_EXPR | |
272 | && SAME_BINFO_TYPE_P (BINFO_TYPE (d_binfo), probe))); | |
c8094d83 | 273 | |
00bfffa4 JM |
274 | if (binfo == d_binfo) |
275 | /* Nothing to do. */ | |
276 | return expr; | |
277 | ||
338d90b8 NS |
278 | if (code == MINUS_EXPR && v_binfo) |
279 | { | |
1f070f2b | 280 | error ("cannot convert from base %qT to derived type %qT via virtual base %qT", |
6bc34b14 | 281 | BINFO_TYPE (binfo), BINFO_TYPE (d_binfo), BINFO_TYPE (v_binfo)); |
338d90b8 NS |
282 | return error_mark_node; |
283 | } | |
1a588ad7 | 284 | |
f576dfc4 JM |
285 | if (!want_pointer) |
286 | /* This must happen before the call to save_expr. */ | |
5ade1ed2 | 287 | expr = cp_build_unary_op (ADDR_EXPR, expr, 0, tf_warning_or_error); |
f576dfc4 | 288 | |
00bfffa4 | 289 | offset = BINFO_OFFSET (binfo); |
ca36f057 | 290 | fixed_type_p = resolves_to_fixed_type_p (expr, &nonnull); |
0e686aa6 | 291 | target_type = code == PLUS_EXPR ? BINFO_TYPE (binfo) : BINFO_TYPE (d_binfo); |
00bfffa4 | 292 | |
d7981fd9 | 293 | /* Do we need to look in the vtable for the real offset? */ |
7a0b47e3 JM |
294 | virtual_access = (v_binfo && fixed_type_p <= 0); |
295 | ||
296 | /* Don't bother with the calculations inside sizeof; they'll ICE if the | |
297 | source type is incomplete and the pointer value doesn't matter. */ | |
298 | if (skip_evaluation) | |
dc555429 JM |
299 | { |
300 | expr = build_nop (build_pointer_type (target_type), expr); | |
301 | if (!want_pointer) | |
c9f9eb5d | 302 | expr = build_indirect_ref (EXPR_LOCATION (expr), expr, NULL); |
dc555429 JM |
303 | return expr; |
304 | } | |
d7981fd9 JM |
305 | |
306 | /* Do we need to check for a null pointer? */ | |
0e686aa6 MM |
307 | if (want_pointer && !nonnull) |
308 | { | |
309 | /* If we know the conversion will not actually change the value | |
310 | of EXPR, then we can avoid testing the expression for NULL. | |
311 | We have to avoid generating a COMPONENT_REF for a base class | |
312 | field, because other parts of the compiler know that such | |
313 | expressions are always non-NULL. */ | |
314 | if (!virtual_access && integer_zerop (offset)) | |
a607b96e MM |
315 | { |
316 | tree class_type; | |
317 | /* TARGET_TYPE has been extracted from BINFO, and, is | |
318 | therefore always cv-unqualified. Extract the | |
319 | cv-qualifiers from EXPR so that the expression returned | |
320 | matches the input. */ | |
321 | class_type = TREE_TYPE (TREE_TYPE (expr)); | |
322 | target_type | |
323 | = cp_build_qualified_type (target_type, | |
324 | cp_type_quals (class_type)); | |
325 | return build_nop (build_pointer_type (target_type), expr); | |
326 | } | |
0e686aa6 MM |
327 | null_test = error_mark_node; |
328 | } | |
00bfffa4 | 329 | |
d7981fd9 JM |
330 | /* Protect against multiple evaluation if necessary. */ |
331 | if (TREE_SIDE_EFFECTS (expr) && (null_test || virtual_access)) | |
ca36f057 | 332 | expr = save_expr (expr); |
f2606a97 | 333 | |
d7981fd9 | 334 | /* Now that we've saved expr, build the real null test. */ |
00bfffa4 | 335 | if (null_test) |
471a58a9 AP |
336 | { |
337 | tree zero = cp_convert (TREE_TYPE (expr), integer_zero_node); | |
7866705a SB |
338 | null_test = fold_build2 (NE_EXPR, boolean_type_node, |
339 | expr, zero); | |
471a58a9 | 340 | } |
00bfffa4 JM |
341 | |
342 | /* If this is a simple base reference, express it as a COMPONENT_REF. */ | |
d7981fd9 | 343 | if (code == PLUS_EXPR && !virtual_access |
00bfffa4 JM |
344 | /* We don't build base fields for empty bases, and they aren't very |
345 | interesting to the optimizers anyway. */ | |
346 | && !has_empty) | |
347 | { | |
5ade1ed2 | 348 | expr = cp_build_indirect_ref (expr, NULL, tf_warning_or_error); |
00bfffa4 JM |
349 | expr = build_simple_base_path (expr, binfo); |
350 | if (want_pointer) | |
442c8e31 | 351 | expr = build_address (expr); |
00bfffa4 JM |
352 | target_type = TREE_TYPE (expr); |
353 | goto out; | |
354 | } | |
355 | ||
d7981fd9 | 356 | if (virtual_access) |
1a588ad7 | 357 | { |
338d90b8 | 358 | /* Going via virtual base V_BINFO. We need the static offset |
0cbd7506 MS |
359 | from V_BINFO to BINFO, and the dynamic offset from D_BINFO to |
360 | V_BINFO. That offset is an entry in D_BINFO's vtable. */ | |
1f5a253a NS |
361 | tree v_offset; |
362 | ||
363 | if (fixed_type_p < 0 && in_base_initializer) | |
364 | { | |
2acb1af9 NS |
365 | /* In a base member initializer, we cannot rely on the |
366 | vtable being set up. We have to indirect via the | |
367 | vtt_parm. */ | |
6de9cd9a DN |
368 | tree t; |
369 | ||
2acb1af9 | 370 | t = TREE_TYPE (TYPE_VFIELD (current_class_type)); |
6de9cd9a DN |
371 | t = build_pointer_type (t); |
372 | v_offset = convert (t, current_vtt_parm); | |
5ade1ed2 DG |
373 | v_offset = cp_build_indirect_ref (v_offset, NULL, |
374 | tf_warning_or_error); | |
1f5a253a NS |
375 | } |
376 | else | |
5ade1ed2 DG |
377 | v_offset = build_vfield_ref (cp_build_indirect_ref (expr, NULL, |
378 | tf_warning_or_error), | |
1f5a253a | 379 | TREE_TYPE (TREE_TYPE (expr))); |
c8094d83 | 380 | |
5be014d5 AP |
381 | v_offset = build2 (POINTER_PLUS_EXPR, TREE_TYPE (v_offset), |
382 | v_offset, fold_convert (sizetype, BINFO_VPTR_FIELD (v_binfo))); | |
c8094d83 | 383 | v_offset = build1 (NOP_EXPR, |
338d90b8 NS |
384 | build_pointer_type (ptrdiff_type_node), |
385 | v_offset); | |
5ade1ed2 | 386 | v_offset = cp_build_indirect_ref (v_offset, NULL, tf_warning_or_error); |
6de9cd9a | 387 | TREE_CONSTANT (v_offset) = 1; |
f63ab951 | 388 | |
7b6d72fc | 389 | offset = convert_to_integer (ptrdiff_type_node, |
c8094d83 | 390 | size_diffop (offset, |
7b6d72fc | 391 | BINFO_OFFSET (v_binfo))); |
8d08fdba | 392 | |
338d90b8 | 393 | if (!integer_zerop (offset)) |
f293ce4b | 394 | v_offset = build2 (code, ptrdiff_type_node, v_offset, offset); |
f2606a97 JM |
395 | |
396 | if (fixed_type_p < 0) | |
397 | /* Negative fixed_type_p means this is a constructor or destructor; | |
398 | virtual base layout is fixed in in-charge [cd]tors, but not in | |
399 | base [cd]tors. */ | |
f293ce4b RS |
400 | offset = build3 (COND_EXPR, ptrdiff_type_node, |
401 | build2 (EQ_EXPR, boolean_type_node, | |
402 | current_in_charge_parm, integer_zero_node), | |
403 | v_offset, | |
aa8f5c20 AP |
404 | convert_to_integer (ptrdiff_type_node, |
405 | BINFO_OFFSET (binfo))); | |
338d90b8 NS |
406 | else |
407 | offset = v_offset; | |
8d08fdba | 408 | } |
8d08fdba | 409 | |
338d90b8 NS |
410 | target_type = cp_build_qualified_type |
411 | (target_type, cp_type_quals (TREE_TYPE (TREE_TYPE (expr)))); | |
412 | ptr_target_type = build_pointer_type (target_type); | |
413 | if (want_pointer) | |
414 | target_type = ptr_target_type; | |
c8094d83 | 415 | |
338d90b8 | 416 | expr = build1 (NOP_EXPR, ptr_target_type, expr); |
fed3cef0 | 417 | |
338d90b8 | 418 | if (!integer_zerop (offset)) |
5be014d5 AP |
419 | { |
420 | offset = fold_convert (sizetype, offset); | |
421 | if (code == MINUS_EXPR) | |
422 | offset = fold_build1 (NEGATE_EXPR, sizetype, offset); | |
423 | expr = build2 (POINTER_PLUS_EXPR, ptr_target_type, expr, offset); | |
424 | } | |
8d08fdba | 425 | else |
338d90b8 | 426 | null_test = NULL; |
c8094d83 | 427 | |
338d90b8 | 428 | if (!want_pointer) |
5ade1ed2 | 429 | expr = cp_build_indirect_ref (expr, NULL, tf_warning_or_error); |
8d08fdba | 430 | |
00bfffa4 | 431 | out: |
338d90b8 | 432 | if (null_test) |
7866705a SB |
433 | expr = fold_build3 (COND_EXPR, target_type, null_test, expr, |
434 | fold_build1 (NOP_EXPR, target_type, | |
435 | integer_zero_node)); | |
f2606a97 | 436 | |
338d90b8 | 437 | return expr; |
8d08fdba MS |
438 | } |
439 | ||
00bfffa4 JM |
440 | /* Subroutine of build_base_path; EXPR and BINFO are as in that function. |
441 | Perform a derived-to-base conversion by recursively building up a | |
442 | sequence of COMPONENT_REFs to the appropriate base fields. */ | |
443 | ||
444 | static tree | |
445 | build_simple_base_path (tree expr, tree binfo) | |
446 | { | |
447 | tree type = BINFO_TYPE (binfo); | |
fc6633e0 | 448 | tree d_binfo = BINFO_INHERITANCE_CHAIN (binfo); |
00bfffa4 JM |
449 | tree field; |
450 | ||
00bfffa4 JM |
451 | if (d_binfo == NULL_TREE) |
452 | { | |
12a669d1 | 453 | tree temp; |
c8094d83 | 454 | |
8dc2b103 | 455 | gcc_assert (TYPE_MAIN_VARIANT (TREE_TYPE (expr)) == type); |
c8094d83 | 456 | |
12a669d1 | 457 | /* Transform `(a, b).x' into `(*(a, &b)).x', `(a ? b : c).x' |
0cbd7506 | 458 | into `(*(a ? &b : &c)).x', and so on. A COND_EXPR is only |
3b426391 KH |
459 | an lvalue in the front end; only _DECLs and _REFs are lvalues |
460 | in the back end. */ | |
12a669d1 NS |
461 | temp = unary_complex_lvalue (ADDR_EXPR, expr); |
462 | if (temp) | |
5ade1ed2 | 463 | expr = cp_build_indirect_ref (temp, NULL, tf_warning_or_error); |
12a669d1 | 464 | |
00bfffa4 JM |
465 | return expr; |
466 | } | |
467 | ||
468 | /* Recurse. */ | |
469 | expr = build_simple_base_path (expr, d_binfo); | |
470 | ||
471 | for (field = TYPE_FIELDS (BINFO_TYPE (d_binfo)); | |
472 | field; field = TREE_CHAIN (field)) | |
473 | /* Is this the base field created by build_base_field? */ | |
474 | if (TREE_CODE (field) == FIELD_DECL | |
642124c6 RH |
475 | && DECL_FIELD_IS_BASE (field) |
476 | && TREE_TYPE (field) == type) | |
12a669d1 NS |
477 | { |
478 | /* We don't use build_class_member_access_expr here, as that | |
479 | has unnecessary checks, and more importantly results in | |
480 | recursive calls to dfs_walk_once. */ | |
481 | int type_quals = cp_type_quals (TREE_TYPE (expr)); | |
482 | ||
483 | expr = build3 (COMPONENT_REF, | |
484 | cp_build_qualified_type (type, type_quals), | |
485 | expr, field, NULL_TREE); | |
486 | expr = fold_if_not_in_template (expr); | |
c8094d83 | 487 | |
12a669d1 NS |
488 | /* Mark the expression const or volatile, as appropriate. |
489 | Even though we've dealt with the type above, we still have | |
490 | to mark the expression itself. */ | |
491 | if (type_quals & TYPE_QUAL_CONST) | |
492 | TREE_READONLY (expr) = 1; | |
493 | if (type_quals & TYPE_QUAL_VOLATILE) | |
494 | TREE_THIS_VOLATILE (expr) = 1; | |
c8094d83 | 495 | |
12a669d1 NS |
496 | return expr; |
497 | } | |
00bfffa4 JM |
498 | |
499 | /* Didn't find the base field?!? */ | |
8dc2b103 | 500 | gcc_unreachable (); |
00bfffa4 JM |
501 | } |
502 | ||
08e17d9d MM |
503 | /* Convert OBJECT to the base TYPE. OBJECT is an expression whose |
504 | type is a class type or a pointer to a class type. In the former | |
505 | case, TYPE is also a class type; in the latter it is another | |
506 | pointer type. If CHECK_ACCESS is true, an error message is emitted | |
507 | if TYPE is inaccessible. If OBJECT has pointer type, the value is | |
508 | assumed to be non-NULL. */ | |
50ad9642 MM |
509 | |
510 | tree | |
08e17d9d | 511 | convert_to_base (tree object, tree type, bool check_access, bool nonnull) |
50ad9642 MM |
512 | { |
513 | tree binfo; | |
08e17d9d | 514 | tree object_type; |
50ad9642 | 515 | |
08e17d9d MM |
516 | if (TYPE_PTR_P (TREE_TYPE (object))) |
517 | { | |
518 | object_type = TREE_TYPE (TREE_TYPE (object)); | |
519 | type = TREE_TYPE (type); | |
520 | } | |
521 | else | |
522 | object_type = TREE_TYPE (object); | |
523 | ||
524 | binfo = lookup_base (object_type, type, | |
c8094d83 | 525 | check_access ? ba_check : ba_unique, |
50ad9642 | 526 | NULL); |
5bfc90de | 527 | if (!binfo || binfo == error_mark_node) |
50ad9642 MM |
528 | return error_mark_node; |
529 | ||
08e17d9d | 530 | return build_base_path (PLUS_EXPR, object, binfo, nonnull); |
50ad9642 MM |
531 | } |
532 | ||
539ed333 NS |
533 | /* EXPR is an expression with unqualified class type. BASE is a base |
534 | binfo of that class type. Returns EXPR, converted to the BASE | |
22ed7e5f MM |
535 | type. This function assumes that EXPR is the most derived class; |
536 | therefore virtual bases can be found at their static offsets. */ | |
537 | ||
538 | tree | |
539 | convert_to_base_statically (tree expr, tree base) | |
540 | { | |
541 | tree expr_type; | |
542 | ||
543 | expr_type = TREE_TYPE (expr); | |
539ed333 | 544 | if (!SAME_BINFO_TYPE_P (BINFO_TYPE (base), expr_type)) |
22ed7e5f MM |
545 | { |
546 | tree pointer_type; | |
547 | ||
548 | pointer_type = build_pointer_type (expr_type); | |
ffd34392 JH |
549 | |
550 | /* We use fold_build2 and fold_convert below to simplify the trees | |
551 | provided to the optimizers. It is not safe to call these functions | |
552 | when processing a template because they do not handle C++-specific | |
553 | trees. */ | |
554 | gcc_assert (!processing_template_decl); | |
5ade1ed2 DG |
555 | expr = cp_build_unary_op (ADDR_EXPR, expr, /*noconvert=*/1, |
556 | tf_warning_or_error); | |
22ed7e5f | 557 | if (!integer_zerop (BINFO_OFFSET (base))) |
5be014d5 AP |
558 | expr = fold_build2 (POINTER_PLUS_EXPR, pointer_type, expr, |
559 | fold_convert (sizetype, BINFO_OFFSET (base))); | |
ffd34392 JH |
560 | expr = fold_convert (build_pointer_type (BINFO_TYPE (base)), expr); |
561 | expr = build_fold_indirect_ref (expr); | |
22ed7e5f MM |
562 | } |
563 | ||
564 | return expr; | |
565 | } | |
566 | ||
f8361147 | 567 | \f |
981c353e RH |
568 | tree |
569 | build_vfield_ref (tree datum, tree type) | |
570 | { | |
571 | tree vfield, vcontext; | |
572 | ||
573 | if (datum == error_mark_node) | |
574 | return error_mark_node; | |
575 | ||
981c353e RH |
576 | /* First, convert to the requested type. */ |
577 | if (!same_type_ignoring_top_level_qualifiers_p (TREE_TYPE (datum), type)) | |
08e17d9d MM |
578 | datum = convert_to_base (datum, type, /*check_access=*/false, |
579 | /*nonnull=*/true); | |
981c353e RH |
580 | |
581 | /* Second, the requested type may not be the owner of its own vptr. | |
582 | If not, convert to the base class that owns it. We cannot use | |
583 | convert_to_base here, because VCONTEXT may appear more than once | |
5995ebfb | 584 | in the inheritance hierarchy of TYPE, and thus direct conversion |
981c353e RH |
585 | between the types may be ambiguous. Following the path back up |
586 | one step at a time via primary bases avoids the problem. */ | |
587 | vfield = TYPE_VFIELD (type); | |
588 | vcontext = DECL_CONTEXT (vfield); | |
589 | while (!same_type_ignoring_top_level_qualifiers_p (vcontext, type)) | |
590 | { | |
591 | datum = build_simple_base_path (datum, CLASSTYPE_PRIMARY_BINFO (type)); | |
592 | type = TREE_TYPE (datum); | |
593 | } | |
594 | ||
595 | return build3 (COMPONENT_REF, TREE_TYPE (vfield), datum, vfield, NULL_TREE); | |
596 | } | |
597 | ||
8d08fdba | 598 | /* Given an object INSTANCE, return an expression which yields the |
67231816 RH |
599 | vtable element corresponding to INDEX. There are many special |
600 | cases for INSTANCE which we take care of here, mainly to avoid | |
601 | creating extra tree nodes when we don't have to. */ | |
e92cc029 | 602 | |
4a8d0c9c | 603 | static tree |
94edc4ab | 604 | build_vtbl_ref_1 (tree instance, tree idx) |
8d08fdba | 605 | { |
f63ab951 JM |
606 | tree aref; |
607 | tree vtbl = NULL_TREE; | |
8d08fdba | 608 | |
f63ab951 JM |
609 | /* Try to figure out what a reference refers to, and |
610 | access its virtual function table directly. */ | |
611 | ||
612 | int cdtorp = 0; | |
613 | tree fixed_type = fixed_type_or_null (instance, NULL, &cdtorp); | |
614 | ||
ee76b931 | 615 | tree basetype = non_reference (TREE_TYPE (instance)); |
8d08fdba | 616 | |
f63ab951 | 617 | if (fixed_type && !cdtorp) |
8d08fdba | 618 | { |
f63ab951 | 619 | tree binfo = lookup_base (fixed_type, basetype, |
18e4be85 | 620 | ba_unique | ba_quiet, NULL); |
f63ab951 | 621 | if (binfo) |
6de9cd9a | 622 | vtbl = unshare_expr (BINFO_VTABLE (binfo)); |
f63ab951 | 623 | } |
8d08fdba | 624 | |
f63ab951 | 625 | if (!vtbl) |
dbbf88d1 | 626 | vtbl = build_vfield_ref (instance, basetype); |
c8094d83 | 627 | |
e3417fcd | 628 | assemble_external (vtbl); |
a1dd0d36 | 629 | |
a63068b6 | 630 | aref = build_array_ref (vtbl, idx, input_location); |
6de9cd9a | 631 | TREE_CONSTANT (aref) |= TREE_CONSTANT (vtbl) && TREE_CONSTANT (idx); |
8d08fdba | 632 | |
c4372ef4 | 633 | return aref; |
8d08fdba MS |
634 | } |
635 | ||
4a8d0c9c | 636 | tree |
94edc4ab | 637 | build_vtbl_ref (tree instance, tree idx) |
4a8d0c9c RH |
638 | { |
639 | tree aref = build_vtbl_ref_1 (instance, idx); | |
640 | ||
4a8d0c9c RH |
641 | return aref; |
642 | } | |
643 | ||
0f59171d RH |
644 | /* Given a stable object pointer INSTANCE_PTR, return an expression which |
645 | yields a function pointer corresponding to vtable element INDEX. */ | |
67231816 RH |
646 | |
647 | tree | |
0f59171d | 648 | build_vfn_ref (tree instance_ptr, tree idx) |
67231816 | 649 | { |
0f59171d RH |
650 | tree aref; |
651 | ||
5ade1ed2 DG |
652 | aref = build_vtbl_ref_1 (cp_build_indirect_ref (instance_ptr, 0, |
653 | tf_warning_or_error), | |
654 | idx); | |
67231816 RH |
655 | |
656 | /* When using function descriptors, the address of the | |
657 | vtable entry is treated as a function pointer. */ | |
658 | if (TARGET_VTABLE_USES_DESCRIPTORS) | |
4a8d0c9c | 659 | aref = build1 (NOP_EXPR, TREE_TYPE (aref), |
5ade1ed2 DG |
660 | cp_build_unary_op (ADDR_EXPR, aref, /*noconvert=*/1, |
661 | tf_warning_or_error)); | |
67231816 | 662 | |
0f59171d | 663 | /* Remember this as a method reference, for later devirtualization. */ |
f293ce4b | 664 | aref = build3 (OBJ_TYPE_REF, TREE_TYPE (aref), aref, instance_ptr, idx); |
0f59171d | 665 | |
67231816 RH |
666 | return aref; |
667 | } | |
668 | ||
669ec2b4 JM |
669 | /* Return the name of the virtual function table (as an IDENTIFIER_NODE) |
670 | for the given TYPE. */ | |
671 | ||
672 | static tree | |
94edc4ab | 673 | get_vtable_name (tree type) |
669ec2b4 | 674 | { |
1f84ec23 | 675 | return mangle_vtbl_for_type (type); |
669ec2b4 JM |
676 | } |
677 | ||
4684cd27 MM |
678 | /* DECL is an entity associated with TYPE, like a virtual table or an |
679 | implicitly generated constructor. Determine whether or not DECL | |
680 | should have external or internal linkage at the object file | |
681 | level. This routine does not deal with COMDAT linkage and other | |
682 | similar complexities; it simply sets TREE_PUBLIC if it possible for | |
683 | entities in other translation units to contain copies of DECL, in | |
684 | the abstract. */ | |
685 | ||
686 | void | |
687 | set_linkage_according_to_type (tree type, tree decl) | |
688 | { | |
689 | /* If TYPE involves a local class in a function with internal | |
690 | linkage, then DECL should have internal linkage too. Other local | |
691 | classes have no linkage -- but if their containing functions | |
692 | have external linkage, it makes sense for DECL to have external | |
693 | linkage too. That will allow template definitions to be merged, | |
694 | for example. */ | |
695 | if (no_linkage_check (type, /*relaxed_p=*/true)) | |
696 | { | |
697 | TREE_PUBLIC (decl) = 0; | |
698 | DECL_INTERFACE_KNOWN (decl) = 1; | |
699 | } | |
700 | else | |
701 | TREE_PUBLIC (decl) = 1; | |
702 | } | |
703 | ||
459c43ad MM |
704 | /* Create a VAR_DECL for a primary or secondary vtable for CLASS_TYPE. |
705 | (For a secondary vtable for B-in-D, CLASS_TYPE should be D, not B.) | |
706 | Use NAME for the name of the vtable, and VTABLE_TYPE for its type. */ | |
b9f39201 MM |
707 | |
708 | static tree | |
94edc4ab | 709 | build_vtable (tree class_type, tree name, tree vtable_type) |
b9f39201 MM |
710 | { |
711 | tree decl; | |
712 | ||
713 | decl = build_lang_decl (VAR_DECL, name, vtable_type); | |
90ecce3e JM |
714 | /* vtable names are already mangled; give them their DECL_ASSEMBLER_NAME |
715 | now to avoid confusion in mangle_decl. */ | |
716 | SET_DECL_ASSEMBLER_NAME (decl, name); | |
b9f39201 MM |
717 | DECL_CONTEXT (decl) = class_type; |
718 | DECL_ARTIFICIAL (decl) = 1; | |
719 | TREE_STATIC (decl) = 1; | |
b9f39201 | 720 | TREE_READONLY (decl) = 1; |
b9f39201 | 721 | DECL_VIRTUAL_P (decl) = 1; |
a6f5e048 | 722 | DECL_ALIGN (decl) = TARGET_VTABLE_ENTRY_ALIGN; |
d35543c0 | 723 | DECL_VTABLE_OR_VTT_P (decl) = 1; |
78d55cc8 JM |
724 | /* At one time the vtable info was grabbed 2 words at a time. This |
725 | fails on sparc unless you have 8-byte alignment. (tiemann) */ | |
726 | DECL_ALIGN (decl) = MAX (TYPE_ALIGN (double_type_node), | |
727 | DECL_ALIGN (decl)); | |
4684cd27 MM |
728 | set_linkage_according_to_type (class_type, decl); |
729 | /* The vtable has not been defined -- yet. */ | |
730 | DECL_EXTERNAL (decl) = 1; | |
731 | DECL_NOT_REALLY_EXTERN (decl) = 1; | |
732 | ||
78e0d62b RH |
733 | /* Mark the VAR_DECL node representing the vtable itself as a |
734 | "gratuitous" one, thereby forcing dwarfout.c to ignore it. It | |
735 | is rather important that such things be ignored because any | |
736 | effort to actually generate DWARF for them will run into | |
737 | trouble when/if we encounter code like: | |
c8094d83 | 738 | |
78e0d62b RH |
739 | #pragma interface |
740 | struct S { virtual void member (); }; | |
c8094d83 | 741 | |
78e0d62b RH |
742 | because the artificial declaration of the vtable itself (as |
743 | manufactured by the g++ front end) will say that the vtable is | |
744 | a static member of `S' but only *after* the debug output for | |
745 | the definition of `S' has already been output. This causes | |
746 | grief because the DWARF entry for the definition of the vtable | |
747 | will try to refer back to an earlier *declaration* of the | |
748 | vtable as a static member of `S' and there won't be one. We | |
749 | might be able to arrange to have the "vtable static member" | |
750 | attached to the member list for `S' before the debug info for | |
751 | `S' get written (which would solve the problem) but that would | |
752 | require more intrusive changes to the g++ front end. */ | |
753 | DECL_IGNORED_P (decl) = 1; | |
78d55cc8 | 754 | |
b9f39201 MM |
755 | return decl; |
756 | } | |
757 | ||
1aa4ccd4 NS |
758 | /* Get the VAR_DECL of the vtable for TYPE. TYPE need not be polymorphic, |
759 | or even complete. If this does not exist, create it. If COMPLETE is | |
838dfd8a | 760 | nonzero, then complete the definition of it -- that will render it |
1aa4ccd4 NS |
761 | impossible to actually build the vtable, but is useful to get at those |
762 | which are known to exist in the runtime. */ | |
763 | ||
c8094d83 | 764 | tree |
94edc4ab | 765 | get_vtable_decl (tree type, int complete) |
1aa4ccd4 | 766 | { |
548502d3 MM |
767 | tree decl; |
768 | ||
769 | if (CLASSTYPE_VTABLES (type)) | |
770 | return CLASSTYPE_VTABLES (type); | |
c8094d83 | 771 | |
d1a74aa7 | 772 | decl = build_vtable (type, get_vtable_name (type), vtbl_type_node); |
548502d3 MM |
773 | CLASSTYPE_VTABLES (type) = decl; |
774 | ||
1aa4ccd4 | 775 | if (complete) |
217f4eb9 MM |
776 | { |
777 | DECL_EXTERNAL (decl) = 1; | |
d174af6c | 778 | finish_decl (decl, NULL_TREE, NULL_TREE); |
217f4eb9 | 779 | } |
1aa4ccd4 | 780 | |
1aa4ccd4 NS |
781 | return decl; |
782 | } | |
783 | ||
28531dd0 MM |
784 | /* Build the primary virtual function table for TYPE. If BINFO is |
785 | non-NULL, build the vtable starting with the initial approximation | |
786 | that it is the same as the one which is the head of the association | |
838dfd8a | 787 | list. Returns a nonzero value if a new vtable is actually |
28531dd0 | 788 | created. */ |
e92cc029 | 789 | |
28531dd0 | 790 | static int |
94edc4ab | 791 | build_primary_vtable (tree binfo, tree type) |
8d08fdba | 792 | { |
31f8e4f3 MM |
793 | tree decl; |
794 | tree virtuals; | |
8d08fdba | 795 | |
1aa4ccd4 | 796 | decl = get_vtable_decl (type, /*complete=*/0); |
c8094d83 | 797 | |
8d08fdba MS |
798 | if (binfo) |
799 | { | |
dbbf88d1 | 800 | if (BINFO_NEW_VTABLE_MARKED (binfo)) |
0533d788 MM |
801 | /* We have already created a vtable for this base, so there's |
802 | no need to do it again. */ | |
28531dd0 | 803 | return 0; |
c8094d83 | 804 | |
d1f05f93 | 805 | virtuals = copy_list (BINFO_VIRTUALS (binfo)); |
c35cce41 MM |
806 | TREE_TYPE (decl) = TREE_TYPE (get_vtbl_decl_for_binfo (binfo)); |
807 | DECL_SIZE (decl) = TYPE_SIZE (TREE_TYPE (decl)); | |
808 | DECL_SIZE_UNIT (decl) = TYPE_SIZE_UNIT (TREE_TYPE (decl)); | |
8d08fdba MS |
809 | } |
810 | else | |
811 | { | |
50bc768d | 812 | gcc_assert (TREE_TYPE (decl) == vtbl_type_node); |
8d08fdba | 813 | virtuals = NULL_TREE; |
8d08fdba MS |
814 | } |
815 | ||
816 | #ifdef GATHER_STATISTICS | |
817 | n_vtables += 1; | |
818 | n_vtable_elems += list_length (virtuals); | |
819 | #endif | |
820 | ||
8d08fdba MS |
821 | /* Initialize the association list for this type, based |
822 | on our first approximation. */ | |
604a3205 NS |
823 | BINFO_VTABLE (TYPE_BINFO (type)) = decl; |
824 | BINFO_VIRTUALS (TYPE_BINFO (type)) = virtuals; | |
dbbf88d1 | 825 | SET_BINFO_NEW_VTABLE_MARKED (TYPE_BINFO (type)); |
28531dd0 | 826 | return 1; |
8d08fdba MS |
827 | } |
828 | ||
3461fba7 | 829 | /* Give BINFO a new virtual function table which is initialized |
8d08fdba MS |
830 | with a skeleton-copy of its original initialization. The only |
831 | entry that changes is the `delta' entry, so we can really | |
832 | share a lot of structure. | |
833 | ||
3461fba7 | 834 | FOR_TYPE is the most derived type which caused this table to |
8d08fdba MS |
835 | be needed. |
836 | ||
838dfd8a | 837 | Returns nonzero if we haven't met BINFO before. |
2636fde4 JM |
838 | |
839 | The order in which vtables are built (by calling this function) for | |
840 | an object must remain the same, otherwise a binary incompatibility | |
841 | can result. */ | |
e92cc029 | 842 | |
28531dd0 | 843 | static int |
dbbf88d1 | 844 | build_secondary_vtable (tree binfo) |
8d08fdba | 845 | { |
dbbf88d1 | 846 | if (BINFO_NEW_VTABLE_MARKED (binfo)) |
0533d788 MM |
847 | /* We already created a vtable for this base. There's no need to |
848 | do it again. */ | |
28531dd0 | 849 | return 0; |
0533d788 | 850 | |
8d7a5379 MM |
851 | /* Remember that we've created a vtable for this BINFO, so that we |
852 | don't try to do so again. */ | |
dbbf88d1 | 853 | SET_BINFO_NEW_VTABLE_MARKED (binfo); |
c8094d83 | 854 | |
8d7a5379 | 855 | /* Make fresh virtual list, so we can smash it later. */ |
d1f05f93 | 856 | BINFO_VIRTUALS (binfo) = copy_list (BINFO_VIRTUALS (binfo)); |
8d7a5379 | 857 | |
3461fba7 NS |
858 | /* Secondary vtables are laid out as part of the same structure as |
859 | the primary vtable. */ | |
860 | BINFO_VTABLE (binfo) = NULL_TREE; | |
28531dd0 | 861 | return 1; |
8d08fdba MS |
862 | } |
863 | ||
28531dd0 | 864 | /* Create a new vtable for BINFO which is the hierarchy dominated by |
838dfd8a | 865 | T. Return nonzero if we actually created a new vtable. */ |
28531dd0 MM |
866 | |
867 | static int | |
94edc4ab | 868 | make_new_vtable (tree t, tree binfo) |
28531dd0 MM |
869 | { |
870 | if (binfo == TYPE_BINFO (t)) | |
871 | /* In this case, it is *type*'s vtable we are modifying. We start | |
d0cd8b44 | 872 | with the approximation that its vtable is that of the |
28531dd0 | 873 | immediate base class. */ |
981c353e | 874 | return build_primary_vtable (binfo, t); |
28531dd0 MM |
875 | else |
876 | /* This is our very own copy of `basetype' to play with. Later, | |
877 | we will fill in all the virtual functions that override the | |
878 | virtual functions in these base classes which are not defined | |
879 | by the current type. */ | |
dbbf88d1 | 880 | return build_secondary_vtable (binfo); |
28531dd0 MM |
881 | } |
882 | ||
883 | /* Make *VIRTUALS, an entry on the BINFO_VIRTUALS list for BINFO | |
884 | (which is in the hierarchy dominated by T) list FNDECL as its | |
4e7512c9 MM |
885 | BV_FN. DELTA is the required constant adjustment from the `this' |
886 | pointer where the vtable entry appears to the `this' required when | |
887 | the function is actually called. */ | |
8d08fdba MS |
888 | |
889 | static void | |
94edc4ab | 890 | modify_vtable_entry (tree t, |
0cbd7506 MS |
891 | tree binfo, |
892 | tree fndecl, | |
893 | tree delta, | |
894 | tree *virtuals) | |
8d08fdba | 895 | { |
28531dd0 | 896 | tree v; |
c0bbf652 | 897 | |
28531dd0 | 898 | v = *virtuals; |
c0bbf652 | 899 | |
5e19c053 | 900 | if (fndecl != BV_FN (v) |
4e7512c9 | 901 | || !tree_int_cst_equal (delta, BV_DELTA (v))) |
c0bbf652 | 902 | { |
28531dd0 MM |
903 | /* We need a new vtable for BINFO. */ |
904 | if (make_new_vtable (t, binfo)) | |
905 | { | |
906 | /* If we really did make a new vtable, we also made a copy | |
907 | of the BINFO_VIRTUALS list. Now, we have to find the | |
908 | corresponding entry in that list. */ | |
909 | *virtuals = BINFO_VIRTUALS (binfo); | |
5e19c053 | 910 | while (BV_FN (*virtuals) != BV_FN (v)) |
28531dd0 MM |
911 | *virtuals = TREE_CHAIN (*virtuals); |
912 | v = *virtuals; | |
913 | } | |
8d08fdba | 914 | |
5e19c053 | 915 | BV_DELTA (v) = delta; |
aabb4cd6 | 916 | BV_VCALL_INDEX (v) = NULL_TREE; |
5e19c053 | 917 | BV_FN (v) = fndecl; |
8d08fdba | 918 | } |
8d08fdba MS |
919 | } |
920 | ||
8d08fdba | 921 | \f |
b2a9b208 | 922 | /* Add method METHOD to class TYPE. If USING_DECL is non-null, it is |
b77fe7b4 NS |
923 | the USING_DECL naming METHOD. Returns true if the method could be |
924 | added to the method vec. */ | |
e92cc029 | 925 | |
b77fe7b4 | 926 | bool |
b2a9b208 | 927 | add_method (tree type, tree method, tree using_decl) |
8d08fdba | 928 | { |
9ba5ff0f | 929 | unsigned slot; |
90ea9897 | 930 | tree overload; |
b54a07e8 NS |
931 | bool template_conv_p = false; |
932 | bool conv_p; | |
d4e6fecb | 933 | VEC(tree,gc) *method_vec; |
aaaa46d2 | 934 | bool complete_p; |
9ba5ff0f NS |
935 | bool insert_p = false; |
936 | tree current_fns; | |
fc40d49c | 937 | tree fns; |
ac2b3222 AP |
938 | |
939 | if (method == error_mark_node) | |
b77fe7b4 | 940 | return false; |
aaaa46d2 MM |
941 | |
942 | complete_p = COMPLETE_TYPE_P (type); | |
b54a07e8 NS |
943 | conv_p = DECL_CONV_FN_P (method); |
944 | if (conv_p) | |
945 | template_conv_p = (TREE_CODE (method) == TEMPLATE_DECL | |
946 | && DECL_TEMPLATE_CONV_FN_P (method)); | |
452a394b | 947 | |
452a394b | 948 | method_vec = CLASSTYPE_METHOD_VEC (type); |
aaaa46d2 MM |
949 | if (!method_vec) |
950 | { | |
951 | /* Make a new method vector. We start with 8 entries. We must | |
952 | allocate at least two (for constructors and destructors), and | |
953 | we're going to end up with an assignment operator at some | |
954 | point as well. */ | |
d4e6fecb | 955 | method_vec = VEC_alloc (tree, gc, 8); |
aaaa46d2 MM |
956 | /* Create slots for constructors and destructors. */ |
957 | VEC_quick_push (tree, method_vec, NULL_TREE); | |
958 | VEC_quick_push (tree, method_vec, NULL_TREE); | |
959 | CLASSTYPE_METHOD_VEC (type) = method_vec; | |
960 | } | |
961 | ||
0fcedd9c | 962 | /* Maintain TYPE_HAS_USER_CONSTRUCTOR, etc. */ |
7137605e MM |
963 | grok_special_member_properties (method); |
964 | ||
452a394b MM |
965 | /* Constructors and destructors go in special slots. */ |
966 | if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (method)) | |
967 | slot = CLASSTYPE_CONSTRUCTOR_SLOT; | |
968 | else if (DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P (method)) | |
4b0d3cbe MM |
969 | { |
970 | slot = CLASSTYPE_DESTRUCTOR_SLOT; | |
c8094d83 | 971 | |
f5c28a15 | 972 | if (TYPE_FOR_JAVA (type)) |
9f4faeae MM |
973 | { |
974 | if (!DECL_ARTIFICIAL (method)) | |
975 | error ("Java class %qT cannot have a destructor", type); | |
976 | else if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type)) | |
977 | error ("Java class %qT cannot have an implicit non-trivial " | |
978 | "destructor", | |
979 | type); | |
980 | } | |
4b0d3cbe | 981 | } |
452a394b | 982 | else |
61a127b3 | 983 | { |
aaaa46d2 MM |
984 | tree m; |
985 | ||
9ba5ff0f | 986 | insert_p = true; |
452a394b | 987 | /* See if we already have an entry with this name. */ |
c8094d83 | 988 | for (slot = CLASSTYPE_FIRST_CONVERSION_SLOT; |
9ba5ff0f | 989 | VEC_iterate (tree, method_vec, slot, m); |
aaaa46d2 | 990 | ++slot) |
5dd236e2 | 991 | { |
5dd236e2 | 992 | m = OVL_CURRENT (m); |
5dd236e2 NS |
993 | if (template_conv_p) |
994 | { | |
aaaa46d2 MM |
995 | if (TREE_CODE (m) == TEMPLATE_DECL |
996 | && DECL_TEMPLATE_CONV_FN_P (m)) | |
997 | insert_p = false; | |
5dd236e2 NS |
998 | break; |
999 | } | |
aaaa46d2 | 1000 | if (conv_p && !DECL_CONV_FN_P (m)) |
5dd236e2 | 1001 | break; |
aaaa46d2 | 1002 | if (DECL_NAME (m) == DECL_NAME (method)) |
452a394b | 1003 | { |
aaaa46d2 MM |
1004 | insert_p = false; |
1005 | break; | |
8d08fdba | 1006 | } |
aaaa46d2 MM |
1007 | if (complete_p |
1008 | && !DECL_CONV_FN_P (m) | |
1009 | && DECL_NAME (m) > DECL_NAME (method)) | |
1010 | break; | |
61a127b3 | 1011 | } |
452a394b | 1012 | } |
9ba5ff0f | 1013 | current_fns = insert_p ? NULL_TREE : VEC_index (tree, method_vec, slot); |
c8094d83 | 1014 | |
fc40d49c LM |
1015 | /* Check to see if we've already got this method. */ |
1016 | for (fns = current_fns; fns; fns = OVL_NEXT (fns)) | |
452a394b | 1017 | { |
fc40d49c LM |
1018 | tree fn = OVL_CURRENT (fns); |
1019 | tree fn_type; | |
1020 | tree method_type; | |
1021 | tree parms1; | |
1022 | tree parms2; | |
1023 | ||
1024 | if (TREE_CODE (fn) != TREE_CODE (method)) | |
1025 | continue; | |
1026 | ||
1027 | /* [over.load] Member function declarations with the | |
1028 | same name and the same parameter types cannot be | |
1029 | overloaded if any of them is a static member | |
1030 | function declaration. | |
1031 | ||
1032 | [namespace.udecl] When a using-declaration brings names | |
1033 | from a base class into a derived class scope, member | |
1034 | functions in the derived class override and/or hide member | |
1035 | functions with the same name and parameter types in a base | |
1036 | class (rather than conflicting). */ | |
1037 | fn_type = TREE_TYPE (fn); | |
1038 | method_type = TREE_TYPE (method); | |
1039 | parms1 = TYPE_ARG_TYPES (fn_type); | |
1040 | parms2 = TYPE_ARG_TYPES (method_type); | |
1041 | ||
1042 | /* Compare the quals on the 'this' parm. Don't compare | |
1043 | the whole types, as used functions are treated as | |
1044 | coming from the using class in overload resolution. */ | |
1045 | if (! DECL_STATIC_FUNCTION_P (fn) | |
1046 | && ! DECL_STATIC_FUNCTION_P (method) | |
7b3e2d46 DG |
1047 | && TREE_TYPE (TREE_VALUE (parms1)) != error_mark_node |
1048 | && TREE_TYPE (TREE_VALUE (parms2)) != error_mark_node | |
fc40d49c LM |
1049 | && (TYPE_QUALS (TREE_TYPE (TREE_VALUE (parms1))) |
1050 | != TYPE_QUALS (TREE_TYPE (TREE_VALUE (parms2))))) | |
1051 | continue; | |
1052 | ||
1053 | /* For templates, the return type and template parameters | |
1054 | must be identical. */ | |
1055 | if (TREE_CODE (fn) == TEMPLATE_DECL | |
1056 | && (!same_type_p (TREE_TYPE (fn_type), | |
1057 | TREE_TYPE (method_type)) | |
1058 | || !comp_template_parms (DECL_TEMPLATE_PARMS (fn), | |
1059 | DECL_TEMPLATE_PARMS (method)))) | |
1060 | continue; | |
1061 | ||
1062 | if (! DECL_STATIC_FUNCTION_P (fn)) | |
1063 | parms1 = TREE_CHAIN (parms1); | |
1064 | if (! DECL_STATIC_FUNCTION_P (method)) | |
1065 | parms2 = TREE_CHAIN (parms2); | |
1066 | ||
1067 | if (compparms (parms1, parms2) | |
1068 | && (!DECL_CONV_FN_P (fn) | |
1069 | || same_type_p (TREE_TYPE (fn_type), | |
1070 | TREE_TYPE (method_type)))) | |
452a394b | 1071 | { |
fc40d49c | 1072 | if (using_decl) |
452a394b | 1073 | { |
fc40d49c LM |
1074 | if (DECL_CONTEXT (fn) == type) |
1075 | /* Defer to the local function. */ | |
1076 | return false; | |
1077 | if (DECL_CONTEXT (fn) == DECL_CONTEXT (method)) | |
1078 | error ("repeated using declaration %q+D", using_decl); | |
f0ab6bf2 | 1079 | else |
fc40d49c LM |
1080 | error ("using declaration %q+D conflicts with a previous using declaration", |
1081 | using_decl); | |
452a394b | 1082 | } |
fc40d49c LM |
1083 | else |
1084 | { | |
1085 | error ("%q+#D cannot be overloaded", method); | |
1086 | error ("with %q+#D", fn); | |
1087 | } | |
1088 | ||
1089 | /* We don't call duplicate_decls here to merge the | |
1090 | declarations because that will confuse things if the | |
1091 | methods have inline definitions. In particular, we | |
1092 | will crash while processing the definitions. */ | |
1093 | return false; | |
03017874 | 1094 | } |
452a394b | 1095 | } |
03017874 | 1096 | |
3db45ab5 | 1097 | /* A class should never have more than one destructor. */ |
357d956e MM |
1098 | if (current_fns && DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P (method)) |
1099 | return false; | |
1100 | ||
c8094d83 | 1101 | /* Add the new binding. */ |
9ba5ff0f | 1102 | overload = build_overload (method, current_fns); |
c8094d83 | 1103 | |
357d956e MM |
1104 | if (conv_p) |
1105 | TYPE_HAS_CONVERSION (type) = 1; | |
1106 | else if (slot >= CLASSTYPE_FIRST_CONVERSION_SLOT && !complete_p) | |
90ea9897 MM |
1107 | push_class_level_binding (DECL_NAME (method), overload); |
1108 | ||
9ba5ff0f NS |
1109 | if (insert_p) |
1110 | { | |
efb7e1e0 ILT |
1111 | bool reallocated; |
1112 | ||
9ba5ff0f NS |
1113 | /* We only expect to add few methods in the COMPLETE_P case, so |
1114 | just make room for one more method in that case. */ | |
efb7e1e0 ILT |
1115 | if (complete_p) |
1116 | reallocated = VEC_reserve_exact (tree, gc, method_vec, 1); | |
1117 | else | |
1118 | reallocated = VEC_reserve (tree, gc, method_vec, 1); | |
1119 | if (reallocated) | |
9ba5ff0f NS |
1120 | CLASSTYPE_METHOD_VEC (type) = method_vec; |
1121 | if (slot == VEC_length (tree, method_vec)) | |
1122 | VEC_quick_push (tree, method_vec, overload); | |
1123 | else | |
1124 | VEC_quick_insert (tree, method_vec, slot, overload); | |
1125 | } | |
1126 | else | |
03fd3f84 | 1127 | /* Replace the current slot. */ |
9ba5ff0f | 1128 | VEC_replace (tree, method_vec, slot, overload); |
b77fe7b4 | 1129 | return true; |
8d08fdba MS |
1130 | } |
1131 | ||
1132 | /* Subroutines of finish_struct. */ | |
1133 | ||
aa52c1ff JM |
1134 | /* Change the access of FDECL to ACCESS in T. Return 1 if change was |
1135 | legit, otherwise return 0. */ | |
e92cc029 | 1136 | |
8d08fdba | 1137 | static int |
94edc4ab | 1138 | alter_access (tree t, tree fdecl, tree access) |
8d08fdba | 1139 | { |
721c3b42 MM |
1140 | tree elem; |
1141 | ||
1142 | if (!DECL_LANG_SPECIFIC (fdecl)) | |
1143 | retrofit_lang_decl (fdecl); | |
1144 | ||
50bc768d | 1145 | gcc_assert (!DECL_DISCRIMINATOR_P (fdecl)); |
8e4ce833 | 1146 | |
721c3b42 | 1147 | elem = purpose_member (t, DECL_ACCESS (fdecl)); |
38afd588 | 1148 | if (elem) |
8d08fdba | 1149 | { |
38afd588 | 1150 | if (TREE_VALUE (elem) != access) |
8d08fdba | 1151 | { |
38afd588 | 1152 | if (TREE_CODE (TREE_TYPE (fdecl)) == FUNCTION_DECL) |
dee15844 JM |
1153 | error ("conflicting access specifications for method" |
1154 | " %q+D, ignored", TREE_TYPE (fdecl)); | |
38afd588 | 1155 | else |
1f070f2b | 1156 | error ("conflicting access specifications for field %qE, ignored", |
4460cef2 | 1157 | DECL_NAME (fdecl)); |
8d08fdba MS |
1158 | } |
1159 | else | |
430bb96b JL |
1160 | { |
1161 | /* They're changing the access to the same thing they changed | |
1162 | it to before. That's OK. */ | |
1163 | ; | |
1164 | } | |
db5ae43f | 1165 | } |
38afd588 | 1166 | else |
8d08fdba | 1167 | { |
02022f3a | 1168 | perform_or_defer_access_check (TYPE_BINFO (t), fdecl, fdecl); |
be99da77 | 1169 | DECL_ACCESS (fdecl) = tree_cons (t, access, DECL_ACCESS (fdecl)); |
8d08fdba MS |
1170 | return 1; |
1171 | } | |
1172 | return 0; | |
1173 | } | |
1174 | ||
58010b57 | 1175 | /* Process the USING_DECL, which is a member of T. */ |
79ad62b2 | 1176 | |
e9659ab0 | 1177 | static void |
94edc4ab | 1178 | handle_using_decl (tree using_decl, tree t) |
79ad62b2 | 1179 | { |
98ed9dae | 1180 | tree decl = USING_DECL_DECLS (using_decl); |
79ad62b2 MM |
1181 | tree name = DECL_NAME (using_decl); |
1182 | tree access | |
1183 | = TREE_PRIVATE (using_decl) ? access_private_node | |
1184 | : TREE_PROTECTED (using_decl) ? access_protected_node | |
1185 | : access_public_node; | |
79ad62b2 | 1186 | tree flist = NULL_TREE; |
aa52c1ff | 1187 | tree old_value; |
79ad62b2 | 1188 | |
98ed9dae | 1189 | gcc_assert (!processing_template_decl && decl); |
c8094d83 | 1190 | |
39fb05d0 | 1191 | old_value = lookup_member (t, name, /*protect=*/0, /*want_type=*/false); |
aa52c1ff | 1192 | if (old_value) |
79ad62b2 | 1193 | { |
aa52c1ff JM |
1194 | if (is_overloaded_fn (old_value)) |
1195 | old_value = OVL_CURRENT (old_value); | |
1196 | ||
1197 | if (DECL_P (old_value) && DECL_CONTEXT (old_value) == t) | |
1198 | /* OK */; | |
1199 | else | |
1200 | old_value = NULL_TREE; | |
79ad62b2 | 1201 | } |
c8094d83 | 1202 | |
6e976965 | 1203 | cp_emit_debug_info_for_using (decl, USING_DECL_SCOPE (using_decl)); |
c8094d83 | 1204 | |
98ed9dae NS |
1205 | if (is_overloaded_fn (decl)) |
1206 | flist = decl; | |
aa52c1ff JM |
1207 | |
1208 | if (! old_value) | |
1209 | ; | |
1210 | else if (is_overloaded_fn (old_value)) | |
79ad62b2 | 1211 | { |
aa52c1ff JM |
1212 | if (flist) |
1213 | /* It's OK to use functions from a base when there are functions with | |
1214 | the same name already present in the current class. */; | |
1215 | else | |
79ad62b2 | 1216 | { |
dee15844 JM |
1217 | error ("%q+D invalid in %q#T", using_decl, t); |
1218 | error (" because of local method %q+#D with same name", | |
1219 | OVL_CURRENT (old_value)); | |
aa52c1ff | 1220 | return; |
79ad62b2 MM |
1221 | } |
1222 | } | |
186c0fbe | 1223 | else if (!DECL_ARTIFICIAL (old_value)) |
aa52c1ff | 1224 | { |
dee15844 JM |
1225 | error ("%q+D invalid in %q#T", using_decl, t); |
1226 | error (" because of local member %q+#D with same name", old_value); | |
aa52c1ff JM |
1227 | return; |
1228 | } | |
c8094d83 | 1229 | |
f4f206f4 | 1230 | /* Make type T see field decl FDECL with access ACCESS. */ |
aa52c1ff JM |
1231 | if (flist) |
1232 | for (; flist; flist = OVL_NEXT (flist)) | |
1233 | { | |
b2a9b208 | 1234 | add_method (t, OVL_CURRENT (flist), using_decl); |
aa52c1ff JM |
1235 | alter_access (t, OVL_CURRENT (flist), access); |
1236 | } | |
1237 | else | |
98ed9dae | 1238 | alter_access (t, decl, access); |
79ad62b2 | 1239 | } |
8d08fdba | 1240 | \f |
e5e459bf AO |
1241 | /* Run through the base classes of T, updating CANT_HAVE_CONST_CTOR_P, |
1242 | and NO_CONST_ASN_REF_P. Also set flag bits in T based on | |
1243 | properties of the bases. */ | |
8d08fdba | 1244 | |
607cf131 | 1245 | static void |
94edc4ab | 1246 | check_bases (tree t, |
0cbd7506 MS |
1247 | int* cant_have_const_ctor_p, |
1248 | int* no_const_asn_ref_p) | |
8d08fdba | 1249 | { |
607cf131 | 1250 | int i; |
0fb3018c | 1251 | int seen_non_virtual_nearly_empty_base_p; |
fa743e8c NS |
1252 | tree base_binfo; |
1253 | tree binfo; | |
8d08fdba | 1254 | |
0fb3018c | 1255 | seen_non_virtual_nearly_empty_base_p = 0; |
607cf131 | 1256 | |
fa743e8c NS |
1257 | for (binfo = TYPE_BINFO (t), i = 0; |
1258 | BINFO_BASE_ITERATE (binfo, i, base_binfo); i++) | |
8d08fdba | 1259 | { |
fa743e8c | 1260 | tree basetype = TREE_TYPE (base_binfo); |
9a71c18b | 1261 | |
50bc768d | 1262 | gcc_assert (COMPLETE_TYPE_P (basetype)); |
c8094d83 | 1263 | |
4c6b7393 | 1264 | /* Effective C++ rule 14. We only need to check TYPE_POLYMORPHIC_P |
607cf131 MM |
1265 | here because the case of virtual functions but non-virtual |
1266 | dtor is handled in finish_struct_1. */ | |
74fa0285 GDR |
1267 | if (!TYPE_POLYMORPHIC_P (basetype)) |
1268 | warning (OPT_Weffc__, | |
3db45ab5 | 1269 | "base class %q#T has a non-virtual destructor", basetype); |
8d08fdba | 1270 | |
607cf131 MM |
1271 | /* If the base class doesn't have copy constructors or |
1272 | assignment operators that take const references, then the | |
1273 | derived class cannot have such a member automatically | |
1274 | generated. */ | |
1275 | if (! TYPE_HAS_CONST_INIT_REF (basetype)) | |
1276 | *cant_have_const_ctor_p = 1; | |
1277 | if (TYPE_HAS_ASSIGN_REF (basetype) | |
1278 | && !TYPE_HAS_CONST_ASSIGN_REF (basetype)) | |
1279 | *no_const_asn_ref_p = 1; | |
8d08fdba | 1280 | |
809e3e7f | 1281 | if (BINFO_VIRTUAL_P (base_binfo)) |
00a17e31 | 1282 | /* A virtual base does not effect nearly emptiness. */ |
0fb3018c | 1283 | ; |
f9c528ea | 1284 | else if (CLASSTYPE_NEARLY_EMPTY_P (basetype)) |
0fb3018c NS |
1285 | { |
1286 | if (seen_non_virtual_nearly_empty_base_p) | |
1287 | /* And if there is more than one nearly empty base, then the | |
1288 | derived class is not nearly empty either. */ | |
1289 | CLASSTYPE_NEARLY_EMPTY_P (t) = 0; | |
1290 | else | |
00a17e31 | 1291 | /* Remember we've seen one. */ |
0fb3018c NS |
1292 | seen_non_virtual_nearly_empty_base_p = 1; |
1293 | } | |
1294 | else if (!is_empty_class (basetype)) | |
1295 | /* If the base class is not empty or nearly empty, then this | |
1296 | class cannot be nearly empty. */ | |
1297 | CLASSTYPE_NEARLY_EMPTY_P (t) = 0; | |
f9c528ea | 1298 | |
607cf131 MM |
1299 | /* A lot of properties from the bases also apply to the derived |
1300 | class. */ | |
8d08fdba | 1301 | TYPE_NEEDS_CONSTRUCTING (t) |= TYPE_NEEDS_CONSTRUCTING (basetype); |
c8094d83 | 1302 | TYPE_HAS_NONTRIVIAL_DESTRUCTOR (t) |
834c6dff | 1303 | |= TYPE_HAS_NONTRIVIAL_DESTRUCTOR (basetype); |
c8094d83 | 1304 | TYPE_HAS_COMPLEX_ASSIGN_REF (t) |
607cf131 | 1305 | |= TYPE_HAS_COMPLEX_ASSIGN_REF (basetype); |
e8abc66f | 1306 | TYPE_HAS_COMPLEX_INIT_REF (t) |= TYPE_HAS_COMPLEX_INIT_REF (basetype); |
4c6b7393 | 1307 | TYPE_POLYMORPHIC_P (t) |= TYPE_POLYMORPHIC_P (basetype); |
c8094d83 | 1308 | CLASSTYPE_CONTAINS_EMPTY_CLASS_P (t) |
5ec1192e | 1309 | |= CLASSTYPE_CONTAINS_EMPTY_CLASS_P (basetype); |
cb68ec50 | 1310 | TYPE_HAS_COMPLEX_DFLT (t) |= TYPE_HAS_COMPLEX_DFLT (basetype); |
607cf131 MM |
1311 | } |
1312 | } | |
1313 | ||
fc6633e0 NS |
1314 | /* Determine all the primary bases within T. Sets BINFO_PRIMARY_BASE_P for |
1315 | those that are primaries. Sets BINFO_LOST_PRIMARY_P for those | |
1316 | that have had a nearly-empty virtual primary base stolen by some | |
77880ae4 | 1317 | other base in the hierarchy. Determines CLASSTYPE_PRIMARY_BASE for |
fc6633e0 | 1318 | T. */ |
c35cce41 MM |
1319 | |
1320 | static void | |
fc6633e0 | 1321 | determine_primary_bases (tree t) |
c35cce41 | 1322 | { |
fc6633e0 NS |
1323 | unsigned i; |
1324 | tree primary = NULL_TREE; | |
1325 | tree type_binfo = TYPE_BINFO (t); | |
1326 | tree base_binfo; | |
1327 | ||
1328 | /* Determine the primary bases of our bases. */ | |
1329 | for (base_binfo = TREE_CHAIN (type_binfo); base_binfo; | |
1330 | base_binfo = TREE_CHAIN (base_binfo)) | |
c35cce41 | 1331 | { |
fc6633e0 | 1332 | tree primary = CLASSTYPE_PRIMARY_BINFO (BINFO_TYPE (base_binfo)); |
c35cce41 | 1333 | |
fc6633e0 NS |
1334 | /* See if we're the non-virtual primary of our inheritance |
1335 | chain. */ | |
1336 | if (!BINFO_VIRTUAL_P (base_binfo)) | |
dbbf88d1 | 1337 | { |
fc6633e0 NS |
1338 | tree parent = BINFO_INHERITANCE_CHAIN (base_binfo); |
1339 | tree parent_primary = CLASSTYPE_PRIMARY_BINFO (BINFO_TYPE (parent)); | |
c8094d83 | 1340 | |
fc6633e0 | 1341 | if (parent_primary |
539ed333 NS |
1342 | && SAME_BINFO_TYPE_P (BINFO_TYPE (base_binfo), |
1343 | BINFO_TYPE (parent_primary))) | |
fc6633e0 NS |
1344 | /* We are the primary binfo. */ |
1345 | BINFO_PRIMARY_P (base_binfo) = 1; | |
1346 | } | |
1347 | /* Determine if we have a virtual primary base, and mark it so. | |
1348 | */ | |
1349 | if (primary && BINFO_VIRTUAL_P (primary)) | |
1350 | { | |
1351 | tree this_primary = copied_binfo (primary, base_binfo); | |
1352 | ||
1353 | if (BINFO_PRIMARY_P (this_primary)) | |
1354 | /* Someone already claimed this base. */ | |
1355 | BINFO_LOST_PRIMARY_P (base_binfo) = 1; | |
1356 | else | |
dbbf88d1 | 1357 | { |
fc6633e0 | 1358 | tree delta; |
c8094d83 | 1359 | |
fc6633e0 NS |
1360 | BINFO_PRIMARY_P (this_primary) = 1; |
1361 | BINFO_INHERITANCE_CHAIN (this_primary) = base_binfo; | |
c8094d83 | 1362 | |
fc6633e0 | 1363 | /* A virtual binfo might have been copied from within |
0cbd7506 MS |
1364 | another hierarchy. As we're about to use it as a |
1365 | primary base, make sure the offsets match. */ | |
fc6633e0 NS |
1366 | delta = size_diffop (convert (ssizetype, |
1367 | BINFO_OFFSET (base_binfo)), | |
1368 | convert (ssizetype, | |
1369 | BINFO_OFFSET (this_primary))); | |
c8094d83 | 1370 | |
fc6633e0 | 1371 | propagate_binfo_offsets (this_primary, delta); |
dbbf88d1 NS |
1372 | } |
1373 | } | |
c35cce41 | 1374 | } |
8026246f | 1375 | |
fc6633e0 | 1376 | /* First look for a dynamic direct non-virtual base. */ |
fa743e8c | 1377 | for (i = 0; BINFO_BASE_ITERATE (type_binfo, i, base_binfo); i++) |
607cf131 | 1378 | { |
607cf131 | 1379 | tree basetype = BINFO_TYPE (base_binfo); |
aff08c18 | 1380 | |
fc6633e0 | 1381 | if (TYPE_CONTAINS_VPTR_P (basetype) && !BINFO_VIRTUAL_P (base_binfo)) |
8d08fdba | 1382 | { |
fc6633e0 NS |
1383 | primary = base_binfo; |
1384 | goto found; | |
911a71a7 MM |
1385 | } |
1386 | } | |
8026246f | 1387 | |
3461fba7 | 1388 | /* A "nearly-empty" virtual base class can be the primary base |
fc6633e0 NS |
1389 | class, if no non-virtual polymorphic base can be found. Look for |
1390 | a nearly-empty virtual dynamic base that is not already a primary | |
77880ae4 | 1391 | base of something in the hierarchy. If there is no such base, |
fc6633e0 NS |
1392 | just pick the first nearly-empty virtual base. */ |
1393 | ||
1394 | for (base_binfo = TREE_CHAIN (type_binfo); base_binfo; | |
1395 | base_binfo = TREE_CHAIN (base_binfo)) | |
1396 | if (BINFO_VIRTUAL_P (base_binfo) | |
1397 | && CLASSTYPE_NEARLY_EMPTY_P (BINFO_TYPE (base_binfo))) | |
1398 | { | |
1399 | if (!BINFO_PRIMARY_P (base_binfo)) | |
1400 | { | |
1401 | /* Found one that is not primary. */ | |
1402 | primary = base_binfo; | |
1403 | goto found; | |
1404 | } | |
1405 | else if (!primary) | |
1406 | /* Remember the first candidate. */ | |
1407 | primary = base_binfo; | |
1408 | } | |
c8094d83 | 1409 | |
fc6633e0 NS |
1410 | found: |
1411 | /* If we've got a primary base, use it. */ | |
1412 | if (primary) | |
7cafdb8b | 1413 | { |
fc6633e0 | 1414 | tree basetype = BINFO_TYPE (primary); |
c8094d83 | 1415 | |
fc6633e0 NS |
1416 | CLASSTYPE_PRIMARY_BINFO (t) = primary; |
1417 | if (BINFO_PRIMARY_P (primary)) | |
1418 | /* We are stealing a primary base. */ | |
1419 | BINFO_LOST_PRIMARY_P (BINFO_INHERITANCE_CHAIN (primary)) = 1; | |
1420 | BINFO_PRIMARY_P (primary) = 1; | |
1421 | if (BINFO_VIRTUAL_P (primary)) | |
7cafdb8b | 1422 | { |
fc6633e0 | 1423 | tree delta; |
7cafdb8b | 1424 | |
fc6633e0 NS |
1425 | BINFO_INHERITANCE_CHAIN (primary) = type_binfo; |
1426 | /* A virtual binfo might have been copied from within | |
0cbd7506 MS |
1427 | another hierarchy. As we're about to use it as a primary |
1428 | base, make sure the offsets match. */ | |
fc6633e0 NS |
1429 | delta = size_diffop (ssize_int (0), |
1430 | convert (ssizetype, BINFO_OFFSET (primary))); | |
c8094d83 | 1431 | |
fc6633e0 | 1432 | propagate_binfo_offsets (primary, delta); |
7cafdb8b | 1433 | } |
c8094d83 | 1434 | |
fc6633e0 | 1435 | primary = TYPE_BINFO (basetype); |
c8094d83 | 1436 | |
fc6633e0 NS |
1437 | TYPE_VFIELD (t) = TYPE_VFIELD (basetype); |
1438 | BINFO_VTABLE (type_binfo) = BINFO_VTABLE (primary); | |
1439 | BINFO_VIRTUALS (type_binfo) = BINFO_VIRTUALS (primary); | |
7cafdb8b | 1440 | } |
8d08fdba | 1441 | } |
8d08fdba | 1442 | \f |
d2c5305b MM |
1443 | /* Set memoizing fields and bits of T (and its variants) for later |
1444 | use. */ | |
e92cc029 | 1445 | |
8d08fdba | 1446 | static void |
94edc4ab | 1447 | finish_struct_bits (tree t) |
8d08fdba | 1448 | { |
090ad434 | 1449 | tree variants; |
c8094d83 | 1450 | |
8d08fdba | 1451 | /* Fix up variants (if any). */ |
090ad434 NS |
1452 | for (variants = TYPE_NEXT_VARIANT (t); |
1453 | variants; | |
1454 | variants = TYPE_NEXT_VARIANT (variants)) | |
8d08fdba MS |
1455 | { |
1456 | /* These fields are in the _TYPE part of the node, not in | |
1457 | the TYPE_LANG_SPECIFIC component, so they are not shared. */ | |
0fcedd9c | 1458 | TYPE_HAS_USER_CONSTRUCTOR (variants) = TYPE_HAS_USER_CONSTRUCTOR (t); |
8d08fdba | 1459 | TYPE_NEEDS_CONSTRUCTING (variants) = TYPE_NEEDS_CONSTRUCTING (t); |
c8094d83 | 1460 | TYPE_HAS_NONTRIVIAL_DESTRUCTOR (variants) |
834c6dff | 1461 | = TYPE_HAS_NONTRIVIAL_DESTRUCTOR (t); |
8d08fdba | 1462 | |
4c6b7393 | 1463 | TYPE_POLYMORPHIC_P (variants) = TYPE_POLYMORPHIC_P (t); |
c8094d83 | 1464 | |
cad7e87b NS |
1465 | TYPE_BINFO (variants) = TYPE_BINFO (t); |
1466 | ||
8d08fdba | 1467 | /* Copy whatever these are holding today. */ |
eb34af89 RK |
1468 | TYPE_VFIELD (variants) = TYPE_VFIELD (t); |
1469 | TYPE_METHODS (variants) = TYPE_METHODS (t); | |
5566b478 | 1470 | TYPE_FIELDS (variants) = TYPE_FIELDS (t); |
5818c8e4 JM |
1471 | |
1472 | /* All variants of a class have the same attributes. */ | |
1473 | TYPE_ATTRIBUTES (variants) = TYPE_ATTRIBUTES (t); | |
8d08fdba MS |
1474 | } |
1475 | ||
fa743e8c | 1476 | if (BINFO_N_BASE_BINFOS (TYPE_BINFO (t)) && TYPE_POLYMORPHIC_P (t)) |
16ae29f1 NS |
1477 | /* For a class w/o baseclasses, 'finish_struct' has set |
1478 | CLASSTYPE_PURE_VIRTUALS correctly (by definition). | |
132c7dd3 NS |
1479 | Similarly for a class whose base classes do not have vtables. |
1480 | When neither of these is true, we might have removed abstract | |
1481 | virtuals (by providing a definition), added some (by declaring | |
1482 | new ones), or redeclared ones from a base class. We need to | |
1483 | recalculate what's really an abstract virtual at this point (by | |
1484 | looking in the vtables). */ | |
1485 | get_pure_virtuals (t); | |
c8094d83 | 1486 | |
132c7dd3 NS |
1487 | /* If this type has a copy constructor or a destructor, force its |
1488 | mode to be BLKmode, and force its TREE_ADDRESSABLE bit to be | |
1489 | nonzero. This will cause it to be passed by invisible reference | |
1490 | and prevent it from being returned in a register. */ | |
8b16faa2 | 1491 | if (! TYPE_HAS_TRIVIAL_INIT_REF (t) || TYPE_HAS_NONTRIVIAL_DESTRUCTOR (t)) |
8d08fdba | 1492 | { |
e8abc66f | 1493 | tree variants; |
d2e5ee5c | 1494 | DECL_MODE (TYPE_MAIN_DECL (t)) = BLKmode; |
e8abc66f | 1495 | for (variants = t; variants; variants = TYPE_NEXT_VARIANT (variants)) |
8d08fdba | 1496 | { |
179d2f74 | 1497 | SET_TYPE_MODE (variants, BLKmode); |
8d08fdba | 1498 | TREE_ADDRESSABLE (variants) = 1; |
8d08fdba MS |
1499 | } |
1500 | } | |
1501 | } | |
1502 | ||
b0e0b31f | 1503 | /* Issue warnings about T having private constructors, but no friends, |
c8094d83 | 1504 | and so forth. |
aed7b2a6 | 1505 | |
b0e0b31f MM |
1506 | HAS_NONPRIVATE_METHOD is nonzero if T has any non-private methods or |
1507 | static members. HAS_NONPRIVATE_STATIC_FN is nonzero if T has any | |
1508 | non-private static member functions. */ | |
1509 | ||
1510 | static void | |
94edc4ab | 1511 | maybe_warn_about_overly_private_class (tree t) |
aed7b2a6 | 1512 | { |
056a3b12 MM |
1513 | int has_member_fn = 0; |
1514 | int has_nonprivate_method = 0; | |
1515 | tree fn; | |
1516 | ||
1517 | if (!warn_ctor_dtor_privacy | |
b0e0b31f MM |
1518 | /* If the class has friends, those entities might create and |
1519 | access instances, so we should not warn. */ | |
056a3b12 MM |
1520 | || (CLASSTYPE_FRIEND_CLASSES (t) |
1521 | || DECL_FRIENDLIST (TYPE_MAIN_DECL (t))) | |
b0e0b31f MM |
1522 | /* We will have warned when the template was declared; there's |
1523 | no need to warn on every instantiation. */ | |
056a3b12 | 1524 | || CLASSTYPE_TEMPLATE_INSTANTIATION (t)) |
c8094d83 | 1525 | /* There's no reason to even consider warning about this |
056a3b12 MM |
1526 | class. */ |
1527 | return; | |
c8094d83 | 1528 | |
056a3b12 MM |
1529 | /* We only issue one warning, if more than one applies, because |
1530 | otherwise, on code like: | |
1531 | ||
1532 | class A { | |
1533 | // Oops - forgot `public:' | |
1534 | A(); | |
1535 | A(const A&); | |
1536 | ~A(); | |
1537 | }; | |
1538 | ||
1539 | we warn several times about essentially the same problem. */ | |
1540 | ||
1541 | /* Check to see if all (non-constructor, non-destructor) member | |
1542 | functions are private. (Since there are no friends or | |
1543 | non-private statics, we can't ever call any of the private member | |
1544 | functions.) */ | |
1545 | for (fn = TYPE_METHODS (t); fn; fn = TREE_CHAIN (fn)) | |
1546 | /* We're not interested in compiler-generated methods; they don't | |
1547 | provide any way to call private members. */ | |
c8094d83 | 1548 | if (!DECL_ARTIFICIAL (fn)) |
056a3b12 MM |
1549 | { |
1550 | if (!TREE_PRIVATE (fn)) | |
b0e0b31f | 1551 | { |
c8094d83 | 1552 | if (DECL_STATIC_FUNCTION_P (fn)) |
056a3b12 MM |
1553 | /* A non-private static member function is just like a |
1554 | friend; it can create and invoke private member | |
1555 | functions, and be accessed without a class | |
1556 | instance. */ | |
1557 | return; | |
c8094d83 | 1558 | |
056a3b12 | 1559 | has_nonprivate_method = 1; |
f576dfc4 | 1560 | /* Keep searching for a static member function. */ |
056a3b12 | 1561 | } |
ce0a5952 | 1562 | else if (!DECL_CONSTRUCTOR_P (fn) && !DECL_DESTRUCTOR_P (fn)) |
056a3b12 | 1563 | has_member_fn = 1; |
c8094d83 | 1564 | } |
aed7b2a6 | 1565 | |
c8094d83 | 1566 | if (!has_nonprivate_method && has_member_fn) |
056a3b12 | 1567 | { |
ce0a5952 MM |
1568 | /* There are no non-private methods, and there's at least one |
1569 | private member function that isn't a constructor or | |
1570 | destructor. (If all the private members are | |
1571 | constructors/destructors we want to use the code below that | |
1572 | issues error messages specifically referring to | |
1573 | constructors/destructors.) */ | |
fa743e8c | 1574 | unsigned i; |
dbbf88d1 | 1575 | tree binfo = TYPE_BINFO (t); |
c8094d83 | 1576 | |
fa743e8c | 1577 | for (i = 0; i != BINFO_N_BASE_BINFOS (binfo); i++) |
604a3205 | 1578 | if (BINFO_BASE_ACCESS (binfo, i) != access_private_node) |
056a3b12 MM |
1579 | { |
1580 | has_nonprivate_method = 1; | |
1581 | break; | |
1582 | } | |
c8094d83 | 1583 | if (!has_nonprivate_method) |
b0e0b31f | 1584 | { |
74fa0285 | 1585 | warning (OPT_Wctor_dtor_privacy, |
3db45ab5 | 1586 | "all member functions in class %qT are private", t); |
056a3b12 | 1587 | return; |
b0e0b31f | 1588 | } |
056a3b12 | 1589 | } |
aed7b2a6 | 1590 | |
056a3b12 MM |
1591 | /* Even if some of the member functions are non-private, the class |
1592 | won't be useful for much if all the constructors or destructors | |
1593 | are private: such an object can never be created or destroyed. */ | |
9f4faeae MM |
1594 | fn = CLASSTYPE_DESTRUCTORS (t); |
1595 | if (fn && TREE_PRIVATE (fn)) | |
056a3b12 | 1596 | { |
74fa0285 | 1597 | warning (OPT_Wctor_dtor_privacy, |
3db45ab5 | 1598 | "%q#T only defines a private destructor and has no friends", |
4b0d3cbe MM |
1599 | t); |
1600 | return; | |
056a3b12 | 1601 | } |
b0e0b31f | 1602 | |
0fcedd9c JM |
1603 | /* Warn about classes that have private constructors and no friends. */ |
1604 | if (TYPE_HAS_USER_CONSTRUCTOR (t) | |
550d1bf4 MM |
1605 | /* Implicitly generated constructors are always public. */ |
1606 | && (!CLASSTYPE_LAZY_DEFAULT_CTOR (t) | |
1607 | || !CLASSTYPE_LAZY_COPY_CTOR (t))) | |
056a3b12 MM |
1608 | { |
1609 | int nonprivate_ctor = 0; | |
c8094d83 | 1610 | |
056a3b12 MM |
1611 | /* If a non-template class does not define a copy |
1612 | constructor, one is defined for it, enabling it to avoid | |
1613 | this warning. For a template class, this does not | |
1614 | happen, and so we would normally get a warning on: | |
b0e0b31f | 1615 | |
c8094d83 MS |
1616 | template <class T> class C { private: C(); }; |
1617 | ||
056a3b12 MM |
1618 | To avoid this asymmetry, we check TYPE_HAS_INIT_REF. All |
1619 | complete non-template or fully instantiated classes have this | |
1620 | flag set. */ | |
1621 | if (!TYPE_HAS_INIT_REF (t)) | |
1622 | nonprivate_ctor = 1; | |
c8094d83 MS |
1623 | else |
1624 | for (fn = CLASSTYPE_CONSTRUCTORS (t); fn; fn = OVL_NEXT (fn)) | |
056a3b12 MM |
1625 | { |
1626 | tree ctor = OVL_CURRENT (fn); | |
1627 | /* Ideally, we wouldn't count copy constructors (or, in | |
1628 | fact, any constructor that takes an argument of the | |
1629 | class type as a parameter) because such things cannot | |
1630 | be used to construct an instance of the class unless | |
1631 | you already have one. But, for now at least, we're | |
1632 | more generous. */ | |
1633 | if (! TREE_PRIVATE (ctor)) | |
b0e0b31f | 1634 | { |
056a3b12 MM |
1635 | nonprivate_ctor = 1; |
1636 | break; | |
b0e0b31f | 1637 | } |
056a3b12 | 1638 | } |
aed7b2a6 | 1639 | |
056a3b12 MM |
1640 | if (nonprivate_ctor == 0) |
1641 | { | |
74fa0285 | 1642 | warning (OPT_Wctor_dtor_privacy, |
3db45ab5 | 1643 | "%q#T only defines private constructors and has no friends", |
0cbd7506 | 1644 | t); |
056a3b12 | 1645 | return; |
b0e0b31f MM |
1646 | } |
1647 | } | |
aed7b2a6 MM |
1648 | } |
1649 | ||
17211ab5 GK |
1650 | static struct { |
1651 | gt_pointer_operator new_value; | |
1652 | void *cookie; | |
1653 | } resort_data; | |
1654 | ||
f90cdf34 MT |
1655 | /* Comparison function to compare two TYPE_METHOD_VEC entries by name. */ |
1656 | ||
1657 | static int | |
94edc4ab | 1658 | method_name_cmp (const void* m1_p, const void* m2_p) |
f90cdf34 | 1659 | { |
67f5655f GDR |
1660 | const tree *const m1 = (const tree *) m1_p; |
1661 | const tree *const m2 = (const tree *) m2_p; | |
c8094d83 | 1662 | |
f90cdf34 MT |
1663 | if (*m1 == NULL_TREE && *m2 == NULL_TREE) |
1664 | return 0; | |
1665 | if (*m1 == NULL_TREE) | |
1666 | return -1; | |
1667 | if (*m2 == NULL_TREE) | |
1668 | return 1; | |
1669 | if (DECL_NAME (OVL_CURRENT (*m1)) < DECL_NAME (OVL_CURRENT (*m2))) | |
1670 | return -1; | |
1671 | return 1; | |
1672 | } | |
b0e0b31f | 1673 | |
17211ab5 GK |
1674 | /* This routine compares two fields like method_name_cmp but using the |
1675 | pointer operator in resort_field_decl_data. */ | |
1676 | ||
1677 | static int | |
94edc4ab | 1678 | resort_method_name_cmp (const void* m1_p, const void* m2_p) |
17211ab5 | 1679 | { |
67f5655f GDR |
1680 | const tree *const m1 = (const tree *) m1_p; |
1681 | const tree *const m2 = (const tree *) m2_p; | |
17211ab5 GK |
1682 | if (*m1 == NULL_TREE && *m2 == NULL_TREE) |
1683 | return 0; | |
1684 | if (*m1 == NULL_TREE) | |
1685 | return -1; | |
1686 | if (*m2 == NULL_TREE) | |
1687 | return 1; | |
1688 | { | |
1689 | tree d1 = DECL_NAME (OVL_CURRENT (*m1)); | |
1690 | tree d2 = DECL_NAME (OVL_CURRENT (*m2)); | |
1691 | resort_data.new_value (&d1, resort_data.cookie); | |
1692 | resort_data.new_value (&d2, resort_data.cookie); | |
1693 | if (d1 < d2) | |
1694 | return -1; | |
1695 | } | |
1696 | return 1; | |
1697 | } | |
1698 | ||
1699 | /* Resort TYPE_METHOD_VEC because pointers have been reordered. */ | |
1700 | ||
c8094d83 | 1701 | void |
94edc4ab | 1702 | resort_type_method_vec (void* obj, |
0cbd7506 MS |
1703 | void* orig_obj ATTRIBUTE_UNUSED , |
1704 | gt_pointer_operator new_value, | |
1705 | void* cookie) | |
17211ab5 | 1706 | { |
d4e6fecb | 1707 | VEC(tree,gc) *method_vec = (VEC(tree,gc) *) obj; |
aaaa46d2 MM |
1708 | int len = VEC_length (tree, method_vec); |
1709 | size_t slot; | |
1710 | tree fn; | |
17211ab5 GK |
1711 | |
1712 | /* The type conversion ops have to live at the front of the vec, so we | |
1713 | can't sort them. */ | |
aaaa46d2 | 1714 | for (slot = CLASSTYPE_FIRST_CONVERSION_SLOT; |
9ba5ff0f | 1715 | VEC_iterate (tree, method_vec, slot, fn); |
aaaa46d2 MM |
1716 | ++slot) |
1717 | if (!DECL_CONV_FN_P (OVL_CURRENT (fn))) | |
1718 | break; | |
1719 | ||
17211ab5 GK |
1720 | if (len - slot > 1) |
1721 | { | |
1722 | resort_data.new_value = new_value; | |
1723 | resort_data.cookie = cookie; | |
aaaa46d2 | 1724 | qsort (VEC_address (tree, method_vec) + slot, len - slot, sizeof (tree), |
17211ab5 GK |
1725 | resort_method_name_cmp); |
1726 | } | |
1727 | } | |
1728 | ||
c7222c02 | 1729 | /* Warn about duplicate methods in fn_fields. |
8d08fdba | 1730 | |
5b0cec3b MM |
1731 | Sort methods that are not special (i.e., constructors, destructors, |
1732 | and type conversion operators) so that we can find them faster in | |
1733 | search. */ | |
8d08fdba | 1734 | |
b0e0b31f | 1735 | static void |
94edc4ab | 1736 | finish_struct_methods (tree t) |
8d08fdba | 1737 | { |
b0e0b31f | 1738 | tree fn_fields; |
d4e6fecb | 1739 | VEC(tree,gc) *method_vec; |
58010b57 MM |
1740 | int slot, len; |
1741 | ||
58010b57 | 1742 | method_vec = CLASSTYPE_METHOD_VEC (t); |
508a1c9c MM |
1743 | if (!method_vec) |
1744 | return; | |
1745 | ||
aaaa46d2 | 1746 | len = VEC_length (tree, method_vec); |
8d08fdba | 1747 | |
c7222c02 | 1748 | /* Clear DECL_IN_AGGR_P for all functions. */ |
c8094d83 | 1749 | for (fn_fields = TYPE_METHODS (t); fn_fields; |
b0e0b31f | 1750 | fn_fields = TREE_CHAIN (fn_fields)) |
5b0cec3b | 1751 | DECL_IN_AGGR_P (fn_fields) = 0; |
8d08fdba | 1752 | |
b0e0b31f MM |
1753 | /* Issue warnings about private constructors and such. If there are |
1754 | no methods, then some public defaults are generated. */ | |
f90cdf34 MT |
1755 | maybe_warn_about_overly_private_class (t); |
1756 | ||
f90cdf34 MT |
1757 | /* The type conversion ops have to live at the front of the vec, so we |
1758 | can't sort them. */ | |
9ba5ff0f NS |
1759 | for (slot = CLASSTYPE_FIRST_CONVERSION_SLOT; |
1760 | VEC_iterate (tree, method_vec, slot, fn_fields); | |
aaaa46d2 MM |
1761 | ++slot) |
1762 | if (!DECL_CONV_FN_P (OVL_CURRENT (fn_fields))) | |
1763 | break; | |
f90cdf34 | 1764 | if (len - slot > 1) |
aaaa46d2 MM |
1765 | qsort (VEC_address (tree, method_vec) + slot, |
1766 | len-slot, sizeof (tree), method_name_cmp); | |
8d08fdba MS |
1767 | } |
1768 | ||
90ecce3e | 1769 | /* Make BINFO's vtable have N entries, including RTTI entries, |
3b426391 | 1770 | vbase and vcall offsets, etc. Set its type and call the back end |
8d7a5379 | 1771 | to lay it out. */ |
1a588ad7 MM |
1772 | |
1773 | static void | |
94edc4ab | 1774 | layout_vtable_decl (tree binfo, int n) |
1a588ad7 | 1775 | { |
1a588ad7 | 1776 | tree atype; |
c35cce41 | 1777 | tree vtable; |
1a588ad7 | 1778 | |
c8094d83 | 1779 | atype = build_cplus_array_type (vtable_entry_type, |
442e01b6 | 1780 | build_index_type (size_int (n - 1))); |
1a588ad7 MM |
1781 | layout_type (atype); |
1782 | ||
1783 | /* We may have to grow the vtable. */ | |
c35cce41 MM |
1784 | vtable = get_vtbl_decl_for_binfo (binfo); |
1785 | if (!same_type_p (TREE_TYPE (vtable), atype)) | |
1a588ad7 | 1786 | { |
06ceef4e | 1787 | TREE_TYPE (vtable) = atype; |
c35cce41 | 1788 | DECL_SIZE (vtable) = DECL_SIZE_UNIT (vtable) = NULL_TREE; |
06ceef4e | 1789 | layout_decl (vtable, 0); |
1a588ad7 MM |
1790 | } |
1791 | } | |
1792 | ||
9bab6c90 MM |
1793 | /* True iff FNDECL and BASE_FNDECL (both non-static member functions) |
1794 | have the same signature. */ | |
83f2ccf4 | 1795 | |
e0fff4b3 | 1796 | int |
58f9752a | 1797 | same_signature_p (const_tree fndecl, const_tree base_fndecl) |
83f2ccf4 | 1798 | { |
872f37f9 MM |
1799 | /* One destructor overrides another if they are the same kind of |
1800 | destructor. */ | |
1801 | if (DECL_DESTRUCTOR_P (base_fndecl) && DECL_DESTRUCTOR_P (fndecl) | |
1802 | && special_function_p (base_fndecl) == special_function_p (fndecl)) | |
ca36f057 | 1803 | return 1; |
872f37f9 MM |
1804 | /* But a non-destructor never overrides a destructor, nor vice |
1805 | versa, nor do different kinds of destructors override | |
1806 | one-another. For example, a complete object destructor does not | |
1807 | override a deleting destructor. */ | |
0d9eb3ba | 1808 | if (DECL_DESTRUCTOR_P (base_fndecl) || DECL_DESTRUCTOR_P (fndecl)) |
ca36f057 | 1809 | return 0; |
872f37f9 | 1810 | |
a6c0d772 MM |
1811 | if (DECL_NAME (fndecl) == DECL_NAME (base_fndecl) |
1812 | || (DECL_CONV_FN_P (fndecl) | |
1813 | && DECL_CONV_FN_P (base_fndecl) | |
1814 | && same_type_p (DECL_CONV_FN_TYPE (fndecl), | |
1815 | DECL_CONV_FN_TYPE (base_fndecl)))) | |
83f2ccf4 | 1816 | { |
ca36f057 | 1817 | tree types, base_types; |
ca36f057 MM |
1818 | types = TYPE_ARG_TYPES (TREE_TYPE (fndecl)); |
1819 | base_types = TYPE_ARG_TYPES (TREE_TYPE (base_fndecl)); | |
1820 | if ((TYPE_QUALS (TREE_TYPE (TREE_VALUE (base_types))) | |
1821 | == TYPE_QUALS (TREE_TYPE (TREE_VALUE (types)))) | |
1822 | && compparms (TREE_CHAIN (base_types), TREE_CHAIN (types))) | |
1823 | return 1; | |
83f2ccf4 | 1824 | } |
ca36f057 | 1825 | return 0; |
83f2ccf4 MM |
1826 | } |
1827 | ||
9368208b MM |
1828 | /* Returns TRUE if DERIVED is a binfo containing the binfo BASE as a |
1829 | subobject. */ | |
c8094d83 | 1830 | |
9368208b MM |
1831 | static bool |
1832 | base_derived_from (tree derived, tree base) | |
1833 | { | |
dbbf88d1 NS |
1834 | tree probe; |
1835 | ||
1836 | for (probe = base; probe; probe = BINFO_INHERITANCE_CHAIN (probe)) | |
1837 | { | |
1838 | if (probe == derived) | |
1839 | return true; | |
809e3e7f | 1840 | else if (BINFO_VIRTUAL_P (probe)) |
dbbf88d1 NS |
1841 | /* If we meet a virtual base, we can't follow the inheritance |
1842 | any more. See if the complete type of DERIVED contains | |
1843 | such a virtual base. */ | |
58c42dc2 NS |
1844 | return (binfo_for_vbase (BINFO_TYPE (probe), BINFO_TYPE (derived)) |
1845 | != NULL_TREE); | |
dbbf88d1 NS |
1846 | } |
1847 | return false; | |
9368208b MM |
1848 | } |
1849 | ||
ca36f057 MM |
1850 | typedef struct find_final_overrider_data_s { |
1851 | /* The function for which we are trying to find a final overrider. */ | |
1852 | tree fn; | |
1853 | /* The base class in which the function was declared. */ | |
1854 | tree declaring_base; | |
9368208b | 1855 | /* The candidate overriders. */ |
78b45a24 | 1856 | tree candidates; |
5d5a519f | 1857 | /* Path to most derived. */ |
d4e6fecb | 1858 | VEC(tree,heap) *path; |
ca36f057 | 1859 | } find_final_overrider_data; |
8d7a5379 | 1860 | |
f7a8132a MM |
1861 | /* Add the overrider along the current path to FFOD->CANDIDATES. |
1862 | Returns true if an overrider was found; false otherwise. */ | |
8d7a5379 | 1863 | |
f7a8132a | 1864 | static bool |
c8094d83 | 1865 | dfs_find_final_overrider_1 (tree binfo, |
5d5a519f NS |
1866 | find_final_overrider_data *ffod, |
1867 | unsigned depth) | |
7177d104 | 1868 | { |
741d8ca3 MM |
1869 | tree method; |
1870 | ||
f7a8132a MM |
1871 | /* If BINFO is not the most derived type, try a more derived class. |
1872 | A definition there will overrider a definition here. */ | |
5d5a519f | 1873 | if (depth) |
dbbf88d1 | 1874 | { |
5d5a519f NS |
1875 | depth--; |
1876 | if (dfs_find_final_overrider_1 | |
1877 | (VEC_index (tree, ffod->path, depth), ffod, depth)) | |
f7a8132a MM |
1878 | return true; |
1879 | } | |
dbbf88d1 | 1880 | |
741d8ca3 | 1881 | method = look_for_overrides_here (BINFO_TYPE (binfo), ffod->fn); |
f7a8132a MM |
1882 | if (method) |
1883 | { | |
1884 | tree *candidate = &ffod->candidates; | |
c8094d83 | 1885 | |
f7a8132a MM |
1886 | /* Remove any candidates overridden by this new function. */ |
1887 | while (*candidate) | |
8d7a5379 | 1888 | { |
f7a8132a MM |
1889 | /* If *CANDIDATE overrides METHOD, then METHOD |
1890 | cannot override anything else on the list. */ | |
1891 | if (base_derived_from (TREE_VALUE (*candidate), binfo)) | |
1892 | return true; | |
1893 | /* If METHOD overrides *CANDIDATE, remove *CANDIDATE. */ | |
1894 | if (base_derived_from (binfo, TREE_VALUE (*candidate))) | |
1895 | *candidate = TREE_CHAIN (*candidate); | |
dbbf88d1 | 1896 | else |
f7a8132a | 1897 | candidate = &TREE_CHAIN (*candidate); |
5e19c053 | 1898 | } |
c8094d83 | 1899 | |
f7a8132a MM |
1900 | /* Add the new function. */ |
1901 | ffod->candidates = tree_cons (method, binfo, ffod->candidates); | |
1902 | return true; | |
dbbf88d1 | 1903 | } |
5e19c053 | 1904 | |
f7a8132a MM |
1905 | return false; |
1906 | } | |
1907 | ||
1908 | /* Called from find_final_overrider via dfs_walk. */ | |
1909 | ||
1910 | static tree | |
5d5a519f | 1911 | dfs_find_final_overrider_pre (tree binfo, void *data) |
f7a8132a MM |
1912 | { |
1913 | find_final_overrider_data *ffod = (find_final_overrider_data *) data; | |
1914 | ||
1915 | if (binfo == ffod->declaring_base) | |
5d5a519f | 1916 | dfs_find_final_overrider_1 (binfo, ffod, VEC_length (tree, ffod->path)); |
d4e6fecb | 1917 | VEC_safe_push (tree, heap, ffod->path, binfo); |
f7a8132a | 1918 | |
dbbf88d1 NS |
1919 | return NULL_TREE; |
1920 | } | |
db3d8cde | 1921 | |
dbbf88d1 | 1922 | static tree |
5d5a519f | 1923 | dfs_find_final_overrider_post (tree binfo ATTRIBUTE_UNUSED, void *data) |
dbbf88d1 | 1924 | { |
dbbf88d1 | 1925 | find_final_overrider_data *ffod = (find_final_overrider_data *) data; |
5d5a519f | 1926 | VEC_pop (tree, ffod->path); |
78b45a24 | 1927 | |
dd42e135 MM |
1928 | return NULL_TREE; |
1929 | } | |
1930 | ||
5e19c053 MM |
1931 | /* Returns a TREE_LIST whose TREE_PURPOSE is the final overrider for |
1932 | FN and whose TREE_VALUE is the binfo for the base where the | |
95675950 MM |
1933 | overriding occurs. BINFO (in the hierarchy dominated by the binfo |
1934 | DERIVED) is the base object in which FN is declared. */ | |
e92cc029 | 1935 | |
a292b002 | 1936 | static tree |
94edc4ab | 1937 | find_final_overrider (tree derived, tree binfo, tree fn) |
a292b002 | 1938 | { |
5e19c053 | 1939 | find_final_overrider_data ffod; |
a292b002 | 1940 | |
0e339752 | 1941 | /* Getting this right is a little tricky. This is valid: |
a292b002 | 1942 | |
5e19c053 MM |
1943 | struct S { virtual void f (); }; |
1944 | struct T { virtual void f (); }; | |
1945 | struct U : public S, public T { }; | |
a292b002 | 1946 | |
c8094d83 | 1947 | even though calling `f' in `U' is ambiguous. But, |
a292b002 | 1948 | |
5e19c053 MM |
1949 | struct R { virtual void f(); }; |
1950 | struct S : virtual public R { virtual void f (); }; | |
1951 | struct T : virtual public R { virtual void f (); }; | |
1952 | struct U : public S, public T { }; | |
dd42e135 | 1953 | |
d0cd8b44 | 1954 | is not -- there's no way to decide whether to put `S::f' or |
c8094d83 MS |
1955 | `T::f' in the vtable for `R'. |
1956 | ||
5e19c053 MM |
1957 | The solution is to look at all paths to BINFO. If we find |
1958 | different overriders along any two, then there is a problem. */ | |
07fa4878 NS |
1959 | if (DECL_THUNK_P (fn)) |
1960 | fn = THUNK_TARGET (fn); | |
f7a8132a MM |
1961 | |
1962 | /* Determine the depth of the hierarchy. */ | |
5e19c053 MM |
1963 | ffod.fn = fn; |
1964 | ffod.declaring_base = binfo; | |
78b45a24 | 1965 | ffod.candidates = NULL_TREE; |
d4e6fecb | 1966 | ffod.path = VEC_alloc (tree, heap, 30); |
5e19c053 | 1967 | |
5d5a519f NS |
1968 | dfs_walk_all (derived, dfs_find_final_overrider_pre, |
1969 | dfs_find_final_overrider_post, &ffod); | |
f7a8132a | 1970 | |
d4e6fecb | 1971 | VEC_free (tree, heap, ffod.path); |
c8094d83 | 1972 | |
78b45a24 | 1973 | /* If there was no winner, issue an error message. */ |
9368208b | 1974 | if (!ffod.candidates || TREE_CHAIN (ffod.candidates)) |
16a1369e | 1975 | return error_mark_node; |
dd42e135 | 1976 | |
9368208b | 1977 | return ffod.candidates; |
a292b002 MS |
1978 | } |
1979 | ||
548502d3 MM |
1980 | /* Return the index of the vcall offset for FN when TYPE is used as a |
1981 | virtual base. */ | |
d0cd8b44 | 1982 | |
d0cd8b44 | 1983 | static tree |
548502d3 | 1984 | get_vcall_index (tree fn, tree type) |
d0cd8b44 | 1985 | { |
d4e6fecb | 1986 | VEC(tree_pair_s,gc) *indices = CLASSTYPE_VCALL_INDICES (type); |
0871761b NS |
1987 | tree_pair_p p; |
1988 | unsigned ix; | |
d0cd8b44 | 1989 | |
0871761b NS |
1990 | for (ix = 0; VEC_iterate (tree_pair_s, indices, ix, p); ix++) |
1991 | if ((DECL_DESTRUCTOR_P (fn) && DECL_DESTRUCTOR_P (p->purpose)) | |
1992 | || same_signature_p (fn, p->purpose)) | |
1993 | return p->value; | |
548502d3 MM |
1994 | |
1995 | /* There should always be an appropriate index. */ | |
8dc2b103 | 1996 | gcc_unreachable (); |
d0cd8b44 | 1997 | } |
d0cd8b44 JM |
1998 | |
1999 | /* Update an entry in the vtable for BINFO, which is in the hierarchy | |
4639c5c6 | 2000 | dominated by T. FN has been overridden in BINFO; VIRTUALS points to the |
d0cd8b44 | 2001 | corresponding position in the BINFO_VIRTUALS list. */ |
4e7512c9 MM |
2002 | |
2003 | static void | |
a2ddc397 NS |
2004 | update_vtable_entry_for_fn (tree t, tree binfo, tree fn, tree* virtuals, |
2005 | unsigned ix) | |
4e7512c9 MM |
2006 | { |
2007 | tree b; | |
2008 | tree overrider; | |
4e7512c9 | 2009 | tree delta; |
31f8e4f3 | 2010 | tree virtual_base; |
d0cd8b44 | 2011 | tree first_defn; |
3cfabe60 NS |
2012 | tree overrider_fn, overrider_target; |
2013 | tree target_fn = DECL_THUNK_P (fn) ? THUNK_TARGET (fn) : fn; | |
2014 | tree over_return, base_return; | |
f11ee281 | 2015 | bool lost = false; |
4e7512c9 | 2016 | |
d0cd8b44 JM |
2017 | /* Find the nearest primary base (possibly binfo itself) which defines |
2018 | this function; this is the class the caller will convert to when | |
2019 | calling FN through BINFO. */ | |
2020 | for (b = binfo; ; b = get_primary_binfo (b)) | |
4e7512c9 | 2021 | { |
50bc768d | 2022 | gcc_assert (b); |
3cfabe60 | 2023 | if (look_for_overrides_here (BINFO_TYPE (b), target_fn)) |
31f8e4f3 | 2024 | break; |
f11ee281 JM |
2025 | |
2026 | /* The nearest definition is from a lost primary. */ | |
2027 | if (BINFO_LOST_PRIMARY_P (b)) | |
2028 | lost = true; | |
4e7512c9 | 2029 | } |
d0cd8b44 | 2030 | first_defn = b; |
4e7512c9 | 2031 | |
31f8e4f3 | 2032 | /* Find the final overrider. */ |
3cfabe60 | 2033 | overrider = find_final_overrider (TYPE_BINFO (t), b, target_fn); |
4e7512c9 | 2034 | if (overrider == error_mark_node) |
16a1369e JJ |
2035 | { |
2036 | error ("no unique final overrider for %qD in %qT", target_fn, t); | |
2037 | return; | |
2038 | } | |
3cfabe60 | 2039 | overrider_target = overrider_fn = TREE_PURPOSE (overrider); |
c8094d83 | 2040 | |
9bcb9aae | 2041 | /* Check for adjusting covariant return types. */ |
3cfabe60 NS |
2042 | over_return = TREE_TYPE (TREE_TYPE (overrider_target)); |
2043 | base_return = TREE_TYPE (TREE_TYPE (target_fn)); | |
c8094d83 | 2044 | |
3cfabe60 NS |
2045 | if (POINTER_TYPE_P (over_return) |
2046 | && TREE_CODE (over_return) == TREE_CODE (base_return) | |
2047 | && CLASS_TYPE_P (TREE_TYPE (over_return)) | |
b77fe7b4 NS |
2048 | && CLASS_TYPE_P (TREE_TYPE (base_return)) |
2049 | /* If the overrider is invalid, don't even try. */ | |
2050 | && !DECL_INVALID_OVERRIDER_P (overrider_target)) | |
3cfabe60 NS |
2051 | { |
2052 | /* If FN is a covariant thunk, we must figure out the adjustment | |
0cbd7506 MS |
2053 | to the final base FN was converting to. As OVERRIDER_TARGET might |
2054 | also be converting to the return type of FN, we have to | |
2055 | combine the two conversions here. */ | |
3cfabe60 | 2056 | tree fixed_offset, virtual_offset; |
12a669d1 NS |
2057 | |
2058 | over_return = TREE_TYPE (over_return); | |
2059 | base_return = TREE_TYPE (base_return); | |
c8094d83 | 2060 | |
3cfabe60 NS |
2061 | if (DECL_THUNK_P (fn)) |
2062 | { | |
50bc768d | 2063 | gcc_assert (DECL_RESULT_THUNK_P (fn)); |
3cfabe60 NS |
2064 | fixed_offset = ssize_int (THUNK_FIXED_OFFSET (fn)); |
2065 | virtual_offset = THUNK_VIRTUAL_OFFSET (fn); | |
3cfabe60 NS |
2066 | } |
2067 | else | |
2068 | fixed_offset = virtual_offset = NULL_TREE; | |
4977bab6 | 2069 | |
e00853fd NS |
2070 | if (virtual_offset) |
2071 | /* Find the equivalent binfo within the return type of the | |
2072 | overriding function. We will want the vbase offset from | |
2073 | there. */ | |
58c42dc2 | 2074 | virtual_offset = binfo_for_vbase (BINFO_TYPE (virtual_offset), |
12a669d1 NS |
2075 | over_return); |
2076 | else if (!same_type_ignoring_top_level_qualifiers_p | |
2077 | (over_return, base_return)) | |
3cfabe60 NS |
2078 | { |
2079 | /* There was no existing virtual thunk (which takes | |
12a669d1 NS |
2080 | precedence). So find the binfo of the base function's |
2081 | return type within the overriding function's return type. | |
2082 | We cannot call lookup base here, because we're inside a | |
2083 | dfs_walk, and will therefore clobber the BINFO_MARKED | |
2084 | flags. Fortunately we know the covariancy is valid (it | |
2085 | has already been checked), so we can just iterate along | |
2086 | the binfos, which have been chained in inheritance graph | |
2087 | order. Of course it is lame that we have to repeat the | |
2088 | search here anyway -- we should really be caching pieces | |
2089 | of the vtable and avoiding this repeated work. */ | |
2090 | tree thunk_binfo, base_binfo; | |
2091 | ||
2092 | /* Find the base binfo within the overriding function's | |
742f25b3 NS |
2093 | return type. We will always find a thunk_binfo, except |
2094 | when the covariancy is invalid (which we will have | |
2095 | already diagnosed). */ | |
12a669d1 NS |
2096 | for (base_binfo = TYPE_BINFO (base_return), |
2097 | thunk_binfo = TYPE_BINFO (over_return); | |
742f25b3 | 2098 | thunk_binfo; |
12a669d1 | 2099 | thunk_binfo = TREE_CHAIN (thunk_binfo)) |
742f25b3 NS |
2100 | if (SAME_BINFO_TYPE_P (BINFO_TYPE (thunk_binfo), |
2101 | BINFO_TYPE (base_binfo))) | |
2102 | break; | |
c8094d83 | 2103 | |
12a669d1 NS |
2104 | /* See if virtual inheritance is involved. */ |
2105 | for (virtual_offset = thunk_binfo; | |
2106 | virtual_offset; | |
2107 | virtual_offset = BINFO_INHERITANCE_CHAIN (virtual_offset)) | |
2108 | if (BINFO_VIRTUAL_P (virtual_offset)) | |
2109 | break; | |
c8094d83 | 2110 | |
742f25b3 NS |
2111 | if (virtual_offset |
2112 | || (thunk_binfo && !BINFO_OFFSET_ZEROP (thunk_binfo))) | |
3cfabe60 | 2113 | { |
bb885938 | 2114 | tree offset = convert (ssizetype, BINFO_OFFSET (thunk_binfo)); |
8d1f0f67 | 2115 | |
12a669d1 | 2116 | if (virtual_offset) |
3cfabe60 | 2117 | { |
12a669d1 NS |
2118 | /* We convert via virtual base. Adjust the fixed |
2119 | offset to be from there. */ | |
bb885938 NS |
2120 | offset = size_diffop |
2121 | (offset, convert | |
2122 | (ssizetype, BINFO_OFFSET (virtual_offset))); | |
3cfabe60 NS |
2123 | } |
2124 | if (fixed_offset) | |
2125 | /* There was an existing fixed offset, this must be | |
2126 | from the base just converted to, and the base the | |
2127 | FN was thunking to. */ | |
2128 | fixed_offset = size_binop (PLUS_EXPR, fixed_offset, offset); | |
2129 | else | |
2130 | fixed_offset = offset; | |
2131 | } | |
2132 | } | |
c8094d83 | 2133 | |
3cfabe60 NS |
2134 | if (fixed_offset || virtual_offset) |
2135 | /* Replace the overriding function with a covariant thunk. We | |
2136 | will emit the overriding function in its own slot as | |
9bcb9aae | 2137 | well. */ |
3cfabe60 NS |
2138 | overrider_fn = make_thunk (overrider_target, /*this_adjusting=*/0, |
2139 | fixed_offset, virtual_offset); | |
2140 | } | |
2141 | else | |
49fedf5a SM |
2142 | gcc_assert (DECL_INVALID_OVERRIDER_P (overrider_target) || |
2143 | !DECL_THUNK_P (fn)); | |
c8094d83 | 2144 | |
31f8e4f3 MM |
2145 | /* Assume that we will produce a thunk that convert all the way to |
2146 | the final overrider, and not to an intermediate virtual base. */ | |
9ccf6541 | 2147 | virtual_base = NULL_TREE; |
31f8e4f3 | 2148 | |
f11ee281 | 2149 | /* See if we can convert to an intermediate virtual base first, and then |
3461fba7 | 2150 | use the vcall offset located there to finish the conversion. */ |
f11ee281 | 2151 | for (; b; b = BINFO_INHERITANCE_CHAIN (b)) |
4e7512c9 | 2152 | { |
d0cd8b44 JM |
2153 | /* If we find the final overrider, then we can stop |
2154 | walking. */ | |
539ed333 NS |
2155 | if (SAME_BINFO_TYPE_P (BINFO_TYPE (b), |
2156 | BINFO_TYPE (TREE_VALUE (overrider)))) | |
1f84ec23 | 2157 | break; |
31f8e4f3 | 2158 | |
d0cd8b44 JM |
2159 | /* If we find a virtual base, and we haven't yet found the |
2160 | overrider, then there is a virtual base between the | |
2161 | declaring base (first_defn) and the final overrider. */ | |
809e3e7f | 2162 | if (BINFO_VIRTUAL_P (b)) |
dbbf88d1 NS |
2163 | { |
2164 | virtual_base = b; | |
2165 | break; | |
2166 | } | |
4e7512c9 | 2167 | } |
4e7512c9 | 2168 | |
a2ddc397 NS |
2169 | if (overrider_fn != overrider_target && !virtual_base) |
2170 | { | |
2171 | /* The ABI specifies that a covariant thunk includes a mangling | |
0cbd7506 MS |
2172 | for a this pointer adjustment. This-adjusting thunks that |
2173 | override a function from a virtual base have a vcall | |
2174 | adjustment. When the virtual base in question is a primary | |
2175 | virtual base, we know the adjustments are zero, (and in the | |
2176 | non-covariant case, we would not use the thunk). | |
2177 | Unfortunately we didn't notice this could happen, when | |
2178 | designing the ABI and so never mandated that such a covariant | |
2179 | thunk should be emitted. Because we must use the ABI mandated | |
2180 | name, we must continue searching from the binfo where we | |
2181 | found the most recent definition of the function, towards the | |
2182 | primary binfo which first introduced the function into the | |
2183 | vtable. If that enters a virtual base, we must use a vcall | |
2184 | this-adjusting thunk. Bleah! */ | |
bb885938 NS |
2185 | tree probe = first_defn; |
2186 | ||
2187 | while ((probe = get_primary_binfo (probe)) | |
2188 | && (unsigned) list_length (BINFO_VIRTUALS (probe)) > ix) | |
809e3e7f | 2189 | if (BINFO_VIRTUAL_P (probe)) |
bb885938 | 2190 | virtual_base = probe; |
c8094d83 | 2191 | |
a2ddc397 NS |
2192 | if (virtual_base) |
2193 | /* Even if we find a virtual base, the correct delta is | |
2194 | between the overrider and the binfo we're building a vtable | |
2195 | for. */ | |
2196 | goto virtual_covariant; | |
2197 | } | |
c8094d83 | 2198 | |
d0cd8b44 JM |
2199 | /* Compute the constant adjustment to the `this' pointer. The |
2200 | `this' pointer, when this function is called, will point at BINFO | |
2201 | (or one of its primary bases, which are at the same offset). */ | |
31f8e4f3 | 2202 | if (virtual_base) |
20dde49d NS |
2203 | /* The `this' pointer needs to be adjusted from the declaration to |
2204 | the nearest virtual base. */ | |
bb885938 NS |
2205 | delta = size_diffop (convert (ssizetype, BINFO_OFFSET (virtual_base)), |
2206 | convert (ssizetype, BINFO_OFFSET (first_defn))); | |
f11ee281 JM |
2207 | else if (lost) |
2208 | /* If the nearest definition is in a lost primary, we don't need an | |
2209 | entry in our vtable. Except possibly in a constructor vtable, | |
2210 | if we happen to get our primary back. In that case, the offset | |
2211 | will be zero, as it will be a primary base. */ | |
2212 | delta = size_zero_node; | |
4e7512c9 | 2213 | else |
548502d3 MM |
2214 | /* The `this' pointer needs to be adjusted from pointing to |
2215 | BINFO to pointing at the base where the final overrider | |
2216 | appears. */ | |
a2ddc397 | 2217 | virtual_covariant: |
bb885938 NS |
2218 | delta = size_diffop (convert (ssizetype, |
2219 | BINFO_OFFSET (TREE_VALUE (overrider))), | |
2220 | convert (ssizetype, BINFO_OFFSET (binfo))); | |
4e7512c9 | 2221 | |
3cfabe60 | 2222 | modify_vtable_entry (t, binfo, overrider_fn, delta, virtuals); |
31f8e4f3 MM |
2223 | |
2224 | if (virtual_base) | |
c8094d83 | 2225 | BV_VCALL_INDEX (*virtuals) |
3cfabe60 | 2226 | = get_vcall_index (overrider_target, BINFO_TYPE (virtual_base)); |
d1f05f93 NS |
2227 | else |
2228 | BV_VCALL_INDEX (*virtuals) = NULL_TREE; | |
4e7512c9 MM |
2229 | } |
2230 | ||
8026246f | 2231 | /* Called from modify_all_vtables via dfs_walk. */ |
e92cc029 | 2232 | |
8026246f | 2233 | static tree |
94edc4ab | 2234 | dfs_modify_vtables (tree binfo, void* data) |
8026246f | 2235 | { |
bcb1079e | 2236 | tree t = (tree) data; |
5b94d9dd NS |
2237 | tree virtuals; |
2238 | tree old_virtuals; | |
2239 | unsigned ix; | |
2240 | ||
2241 | if (!TYPE_CONTAINS_VPTR_P (BINFO_TYPE (binfo))) | |
2242 | /* A base without a vtable needs no modification, and its bases | |
2243 | are uninteresting. */ | |
2244 | return dfs_skip_bases; | |
c8094d83 | 2245 | |
5b94d9dd NS |
2246 | if (SAME_BINFO_TYPE_P (BINFO_TYPE (binfo), t) |
2247 | && !CLASSTYPE_HAS_PRIMARY_BASE_P (t)) | |
2248 | /* Don't do the primary vtable, if it's new. */ | |
2249 | return NULL_TREE; | |
2250 | ||
2251 | if (BINFO_PRIMARY_P (binfo) && !BINFO_VIRTUAL_P (binfo)) | |
2252 | /* There's no need to modify the vtable for a non-virtual primary | |
2253 | base; we're not going to use that vtable anyhow. We do still | |
2254 | need to do this for virtual primary bases, as they could become | |
2255 | non-primary in a construction vtable. */ | |
2256 | return NULL_TREE; | |
2257 | ||
2258 | make_new_vtable (t, binfo); | |
c8094d83 | 2259 | |
5b94d9dd NS |
2260 | /* Now, go through each of the virtual functions in the virtual |
2261 | function table for BINFO. Find the final overrider, and update | |
2262 | the BINFO_VIRTUALS list appropriately. */ | |
2263 | for (ix = 0, virtuals = BINFO_VIRTUALS (binfo), | |
2264 | old_virtuals = BINFO_VIRTUALS (TYPE_BINFO (BINFO_TYPE (binfo))); | |
2265 | virtuals; | |
2266 | ix++, virtuals = TREE_CHAIN (virtuals), | |
2267 | old_virtuals = TREE_CHAIN (old_virtuals)) | |
c8094d83 MS |
2268 | update_vtable_entry_for_fn (t, |
2269 | binfo, | |
5b94d9dd NS |
2270 | BV_FN (old_virtuals), |
2271 | &virtuals, ix); | |
8026246f | 2272 | |
8026246f MM |
2273 | return NULL_TREE; |
2274 | } | |
2275 | ||
a68ad5bd MM |
2276 | /* Update all of the primary and secondary vtables for T. Create new |
2277 | vtables as required, and initialize their RTTI information. Each | |
e6858a84 NS |
2278 | of the functions in VIRTUALS is declared in T and may override a |
2279 | virtual function from a base class; find and modify the appropriate | |
2280 | entries to point to the overriding functions. Returns a list, in | |
2281 | declaration order, of the virtual functions that are declared in T, | |
2282 | but do not appear in the primary base class vtable, and which | |
2283 | should therefore be appended to the end of the vtable for T. */ | |
a68ad5bd MM |
2284 | |
2285 | static tree | |
94edc4ab | 2286 | modify_all_vtables (tree t, tree virtuals) |
8026246f | 2287 | { |
3461fba7 NS |
2288 | tree binfo = TYPE_BINFO (t); |
2289 | tree *fnsp; | |
a68ad5bd | 2290 | |
5e19c053 | 2291 | /* Update all of the vtables. */ |
5b94d9dd | 2292 | dfs_walk_once (binfo, dfs_modify_vtables, NULL, t); |
a68ad5bd | 2293 | |
e6858a84 NS |
2294 | /* Add virtual functions not already in our primary vtable. These |
2295 | will be both those introduced by this class, and those overridden | |
2296 | from secondary bases. It does not include virtuals merely | |
2297 | inherited from secondary bases. */ | |
2298 | for (fnsp = &virtuals; *fnsp; ) | |
a68ad5bd | 2299 | { |
3461fba7 | 2300 | tree fn = TREE_VALUE (*fnsp); |
a68ad5bd | 2301 | |
e6858a84 NS |
2302 | if (!value_member (fn, BINFO_VIRTUALS (binfo)) |
2303 | || DECL_VINDEX (fn) == error_mark_node) | |
a68ad5bd | 2304 | { |
3461fba7 NS |
2305 | /* We don't need to adjust the `this' pointer when |
2306 | calling this function. */ | |
2307 | BV_DELTA (*fnsp) = integer_zero_node; | |
2308 | BV_VCALL_INDEX (*fnsp) = NULL_TREE; | |
2309 | ||
e6858a84 | 2310 | /* This is a function not already in our vtable. Keep it. */ |
3461fba7 | 2311 | fnsp = &TREE_CHAIN (*fnsp); |
a68ad5bd | 2312 | } |
3461fba7 NS |
2313 | else |
2314 | /* We've already got an entry for this function. Skip it. */ | |
2315 | *fnsp = TREE_CHAIN (*fnsp); | |
a68ad5bd | 2316 | } |
e93ee644 | 2317 | |
e6858a84 | 2318 | return virtuals; |
7177d104 MS |
2319 | } |
2320 | ||
7d5b8b11 MM |
2321 | /* Get the base virtual function declarations in T that have the |
2322 | indicated NAME. */ | |
e92cc029 | 2323 | |
5ddc28a5 | 2324 | static tree |
94edc4ab | 2325 | get_basefndecls (tree name, tree t) |
9e9ff709 | 2326 | { |
7d5b8b11 | 2327 | tree methods; |
9e9ff709 | 2328 | tree base_fndecls = NULL_TREE; |
604a3205 | 2329 | int n_baseclasses = BINFO_N_BASE_BINFOS (TYPE_BINFO (t)); |
7d5b8b11 | 2330 | int i; |
9e9ff709 | 2331 | |
3d1df1fa MM |
2332 | /* Find virtual functions in T with the indicated NAME. */ |
2333 | i = lookup_fnfields_1 (t, name); | |
2334 | if (i != -1) | |
aaaa46d2 | 2335 | for (methods = VEC_index (tree, CLASSTYPE_METHOD_VEC (t), i); |
3d1df1fa MM |
2336 | methods; |
2337 | methods = OVL_NEXT (methods)) | |
2338 | { | |
2339 | tree method = OVL_CURRENT (methods); | |
2340 | ||
2341 | if (TREE_CODE (method) == FUNCTION_DECL | |
2342 | && DECL_VINDEX (method)) | |
2343 | base_fndecls = tree_cons (NULL_TREE, method, base_fndecls); | |
2344 | } | |
9e9ff709 MS |
2345 | |
2346 | if (base_fndecls) | |
2347 | return base_fndecls; | |
2348 | ||
2349 | for (i = 0; i < n_baseclasses; i++) | |
2350 | { | |
604a3205 | 2351 | tree basetype = BINFO_TYPE (BINFO_BASE_BINFO (TYPE_BINFO (t), i)); |
7d5b8b11 | 2352 | base_fndecls = chainon (get_basefndecls (name, basetype), |
9e9ff709 MS |
2353 | base_fndecls); |
2354 | } | |
2355 | ||
2356 | return base_fndecls; | |
2357 | } | |
2358 | ||
2ee887f2 MS |
2359 | /* If this declaration supersedes the declaration of |
2360 | a method declared virtual in the base class, then | |
2361 | mark this field as being virtual as well. */ | |
2362 | ||
9f4faeae | 2363 | void |
94edc4ab | 2364 | check_for_override (tree decl, tree ctype) |
2ee887f2 | 2365 | { |
cbb40945 NS |
2366 | if (TREE_CODE (decl) == TEMPLATE_DECL) |
2367 | /* In [temp.mem] we have: | |
2ee887f2 | 2368 | |
0cbd7506 MS |
2369 | A specialization of a member function template does not |
2370 | override a virtual function from a base class. */ | |
cbb40945 NS |
2371 | return; |
2372 | if ((DECL_DESTRUCTOR_P (decl) | |
a6c0d772 MM |
2373 | || IDENTIFIER_VIRTUAL_P (DECL_NAME (decl)) |
2374 | || DECL_CONV_FN_P (decl)) | |
cbb40945 NS |
2375 | && look_for_overrides (ctype, decl) |
2376 | && !DECL_STATIC_FUNCTION_P (decl)) | |
e6858a84 NS |
2377 | /* Set DECL_VINDEX to a value that is neither an INTEGER_CST nor |
2378 | the error_mark_node so that we know it is an overriding | |
2379 | function. */ | |
2380 | DECL_VINDEX (decl) = decl; | |
2381 | ||
cbb40945 | 2382 | if (DECL_VIRTUAL_P (decl)) |
2ee887f2 | 2383 | { |
e6858a84 | 2384 | if (!DECL_VINDEX (decl)) |
2ee887f2 MS |
2385 | DECL_VINDEX (decl) = error_mark_node; |
2386 | IDENTIFIER_VIRTUAL_P (DECL_NAME (decl)) = 1; | |
2387 | } | |
2388 | } | |
2389 | ||
fc378698 MS |
2390 | /* Warn about hidden virtual functions that are not overridden in t. |
2391 | We know that constructors and destructors don't apply. */ | |
e92cc029 | 2392 | |
b23e103b | 2393 | static void |
94edc4ab | 2394 | warn_hidden (tree t) |
9e9ff709 | 2395 | { |
d4e6fecb | 2396 | VEC(tree,gc) *method_vec = CLASSTYPE_METHOD_VEC (t); |
aaaa46d2 MM |
2397 | tree fns; |
2398 | size_t i; | |
9e9ff709 MS |
2399 | |
2400 | /* We go through each separately named virtual function. */ | |
c8094d83 | 2401 | for (i = CLASSTYPE_FIRST_CONVERSION_SLOT; |
9ba5ff0f | 2402 | VEC_iterate (tree, method_vec, i, fns); |
aaaa46d2 | 2403 | ++i) |
9e9ff709 | 2404 | { |
aaaa46d2 | 2405 | tree fn; |
7d5b8b11 MM |
2406 | tree name; |
2407 | tree fndecl; | |
2408 | tree base_fndecls; | |
fa743e8c NS |
2409 | tree base_binfo; |
2410 | tree binfo; | |
7d5b8b11 MM |
2411 | int j; |
2412 | ||
2413 | /* All functions in this slot in the CLASSTYPE_METHOD_VEC will | |
2414 | have the same name. Figure out what name that is. */ | |
aaaa46d2 | 2415 | name = DECL_NAME (OVL_CURRENT (fns)); |
7d5b8b11 MM |
2416 | /* There are no possibly hidden functions yet. */ |
2417 | base_fndecls = NULL_TREE; | |
2418 | /* Iterate through all of the base classes looking for possibly | |
2419 | hidden functions. */ | |
fa743e8c NS |
2420 | for (binfo = TYPE_BINFO (t), j = 0; |
2421 | BINFO_BASE_ITERATE (binfo, j, base_binfo); j++) | |
a4832853 | 2422 | { |
fa743e8c | 2423 | tree basetype = BINFO_TYPE (base_binfo); |
7d5b8b11 MM |
2424 | base_fndecls = chainon (get_basefndecls (name, basetype), |
2425 | base_fndecls); | |
a4832853 JM |
2426 | } |
2427 | ||
00a17e31 | 2428 | /* If there are no functions to hide, continue. */ |
7d5b8b11 | 2429 | if (!base_fndecls) |
9e9ff709 MS |
2430 | continue; |
2431 | ||
00a17e31 | 2432 | /* Remove any overridden functions. */ |
aaaa46d2 | 2433 | for (fn = fns; fn; fn = OVL_NEXT (fn)) |
9e9ff709 | 2434 | { |
aaaa46d2 | 2435 | fndecl = OVL_CURRENT (fn); |
7d5b8b11 MM |
2436 | if (DECL_VINDEX (fndecl)) |
2437 | { | |
2438 | tree *prev = &base_fndecls; | |
c8094d83 MS |
2439 | |
2440 | while (*prev) | |
7d5b8b11 MM |
2441 | /* If the method from the base class has the same |
2442 | signature as the method from the derived class, it | |
2443 | has been overridden. */ | |
2444 | if (same_signature_p (fndecl, TREE_VALUE (*prev))) | |
2445 | *prev = TREE_CHAIN (*prev); | |
2446 | else | |
2447 | prev = &TREE_CHAIN (*prev); | |
2448 | } | |
9e9ff709 MS |
2449 | } |
2450 | ||
9e9ff709 MS |
2451 | /* Now give a warning for all base functions without overriders, |
2452 | as they are hidden. */ | |
c8094d83 | 2453 | while (base_fndecls) |
7d5b8b11 MM |
2454 | { |
2455 | /* Here we know it is a hider, and no overrider exists. */ | |
286d12f9 MLI |
2456 | warning (OPT_Woverloaded_virtual, "%q+D was hidden", TREE_VALUE (base_fndecls)); |
2457 | warning (OPT_Woverloaded_virtual, " by %q+D", fns); | |
7d5b8b11 MM |
2458 | base_fndecls = TREE_CHAIN (base_fndecls); |
2459 | } | |
9e9ff709 MS |
2460 | } |
2461 | } | |
2462 | ||
2463 | /* Check for things that are invalid. There are probably plenty of other | |
2464 | things we should check for also. */ | |
e92cc029 | 2465 | |
9e9ff709 | 2466 | static void |
94edc4ab | 2467 | finish_struct_anon (tree t) |
9e9ff709 MS |
2468 | { |
2469 | tree field; | |
f90cdf34 | 2470 | |
9e9ff709 MS |
2471 | for (field = TYPE_FIELDS (t); field; field = TREE_CHAIN (field)) |
2472 | { | |
2473 | if (TREE_STATIC (field)) | |
2474 | continue; | |
2475 | if (TREE_CODE (field) != FIELD_DECL) | |
2476 | continue; | |
2477 | ||
2478 | if (DECL_NAME (field) == NULL_TREE | |
6bdb8141 | 2479 | && ANON_AGGR_TYPE_P (TREE_TYPE (field))) |
9e9ff709 | 2480 | { |
61fdc9d7 | 2481 | bool is_union = TREE_CODE (TREE_TYPE (field)) == UNION_TYPE; |
f90cdf34 MT |
2482 | tree elt = TYPE_FIELDS (TREE_TYPE (field)); |
2483 | for (; elt; elt = TREE_CHAIN (elt)) | |
9e9ff709 | 2484 | { |
b7076960 MM |
2485 | /* We're generally only interested in entities the user |
2486 | declared, but we also find nested classes by noticing | |
2487 | the TYPE_DECL that we create implicitly. You're | |
2488 | allowed to put one anonymous union inside another, | |
6f32162a JM |
2489 | though, so we explicitly tolerate that. We use |
2490 | TYPE_ANONYMOUS_P rather than ANON_AGGR_TYPE_P so that | |
2491 | we also allow unnamed types used for defining fields. */ | |
c8094d83 | 2492 | if (DECL_ARTIFICIAL (elt) |
b7076960 | 2493 | && (!DECL_IMPLICIT_TYPEDEF_P (elt) |
6f32162a | 2494 | || TYPE_ANONYMOUS_P (TREE_TYPE (elt)))) |
9e9ff709 MS |
2495 | continue; |
2496 | ||
f90cdf34 | 2497 | if (TREE_CODE (elt) != FIELD_DECL) |
8ebeee52 | 2498 | { |
61fdc9d7 | 2499 | if (is_union) |
cbe5f3b3 | 2500 | permerror (input_location, "%q+#D invalid; an anonymous union can " |
393eda6a | 2501 | "only have non-static data members", elt); |
61fdc9d7 | 2502 | else |
cbe5f3b3 | 2503 | permerror (input_location, "%q+#D invalid; an anonymous struct can " |
393eda6a | 2504 | "only have non-static data members", elt); |
8ebeee52 JM |
2505 | continue; |
2506 | } | |
2507 | ||
f90cdf34 | 2508 | if (TREE_PRIVATE (elt)) |
61fdc9d7 PC |
2509 | { |
2510 | if (is_union) | |
cbe5f3b3 | 2511 | permerror (input_location, "private member %q+#D in anonymous union", elt); |
61fdc9d7 | 2512 | else |
cbe5f3b3 | 2513 | permerror (input_location, "private member %q+#D in anonymous struct", elt); |
61fdc9d7 | 2514 | } |
f90cdf34 | 2515 | else if (TREE_PROTECTED (elt)) |
61fdc9d7 PC |
2516 | { |
2517 | if (is_union) | |
cbe5f3b3 | 2518 | permerror (input_location, "protected member %q+#D in anonymous union", elt); |
61fdc9d7 | 2519 | else |
cbe5f3b3 | 2520 | permerror (input_location, "protected member %q+#D in anonymous struct", elt); |
61fdc9d7 | 2521 | } |
fc378698 | 2522 | |
f90cdf34 MT |
2523 | TREE_PRIVATE (elt) = TREE_PRIVATE (field); |
2524 | TREE_PROTECTED (elt) = TREE_PROTECTED (field); | |
9e9ff709 MS |
2525 | } |
2526 | } | |
2527 | } | |
2528 | } | |
2529 | ||
7088fca9 KL |
2530 | /* Add T to CLASSTYPE_DECL_LIST of current_class_type which |
2531 | will be used later during class template instantiation. | |
2532 | When FRIEND_P is zero, T can be a static member data (VAR_DECL), | |
2533 | a non-static member data (FIELD_DECL), a member function | |
c8094d83 | 2534 | (FUNCTION_DECL), a nested type (RECORD_TYPE, ENUM_TYPE), |
7088fca9 KL |
2535 | a typedef (TYPE_DECL) or a member class template (TEMPLATE_DECL) |
2536 | When FRIEND_P is nonzero, T is either a friend class | |
2537 | (RECORD_TYPE, TEMPLATE_DECL) or a friend function | |
2538 | (FUNCTION_DECL, TEMPLATE_DECL). */ | |
2539 | ||
2540 | void | |
94edc4ab | 2541 | maybe_add_class_template_decl_list (tree type, tree t, int friend_p) |
7088fca9 KL |
2542 | { |
2543 | /* Save some memory by not creating TREE_LIST if TYPE is not template. */ | |
2544 | if (CLASSTYPE_TEMPLATE_INFO (type)) | |
2545 | CLASSTYPE_DECL_LIST (type) | |
2546 | = tree_cons (friend_p ? NULL_TREE : type, | |
2547 | t, CLASSTYPE_DECL_LIST (type)); | |
2548 | } | |
2549 | ||
61a127b3 | 2550 | /* Create default constructors, assignment operators, and so forth for |
e5e459bf AO |
2551 | the type indicated by T, if they are needed. CANT_HAVE_CONST_CTOR, |
2552 | and CANT_HAVE_CONST_ASSIGNMENT are nonzero if, for whatever reason, | |
2553 | the class cannot have a default constructor, copy constructor | |
2554 | taking a const reference argument, or an assignment operator taking | |
2555 | a const reference, respectively. */ | |
61a127b3 | 2556 | |
f72ab53b | 2557 | static void |
c8094d83 | 2558 | add_implicitly_declared_members (tree t, |
94edc4ab NN |
2559 | int cant_have_const_cctor, |
2560 | int cant_have_const_assignment) | |
61a127b3 | 2561 | { |
61a127b3 | 2562 | /* Destructor. */ |
9f4faeae | 2563 | if (!CLASSTYPE_DESTRUCTORS (t)) |
61a127b3 | 2564 | { |
9f4faeae MM |
2565 | /* In general, we create destructors lazily. */ |
2566 | CLASSTYPE_LAZY_DESTRUCTOR (t) = 1; | |
2567 | /* However, if the implicit destructor is non-trivial | |
2568 | destructor, we sometimes have to create it at this point. */ | |
2569 | if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (t)) | |
2570 | { | |
2571 | bool lazy_p = true; | |
61a127b3 | 2572 | |
9f4faeae MM |
2573 | if (TYPE_FOR_JAVA (t)) |
2574 | /* If this a Java class, any non-trivial destructor is | |
2575 | invalid, even if compiler-generated. Therefore, if the | |
2576 | destructor is non-trivial we create it now. */ | |
2577 | lazy_p = false; | |
2578 | else | |
2579 | { | |
2580 | tree binfo; | |
2581 | tree base_binfo; | |
2582 | int ix; | |
2583 | ||
2584 | /* If the implicit destructor will be virtual, then we must | |
2585 | generate it now because (unfortunately) we do not | |
2586 | generate virtual tables lazily. */ | |
2587 | binfo = TYPE_BINFO (t); | |
2588 | for (ix = 0; BINFO_BASE_ITERATE (binfo, ix, base_binfo); ix++) | |
2589 | { | |
2590 | tree base_type; | |
2591 | tree dtor; | |
2592 | ||
2593 | base_type = BINFO_TYPE (base_binfo); | |
2594 | dtor = CLASSTYPE_DESTRUCTORS (base_type); | |
2595 | if (dtor && DECL_VIRTUAL_P (dtor)) | |
2596 | { | |
2597 | lazy_p = false; | |
2598 | break; | |
2599 | } | |
2600 | } | |
2601 | } | |
2602 | ||
2603 | /* If we can't get away with being lazy, generate the destructor | |
c8094d83 | 2604 | now. */ |
9f4faeae MM |
2605 | if (!lazy_p) |
2606 | lazily_declare_fn (sfk_destructor, t); | |
2607 | } | |
61a127b3 | 2608 | } |
61a127b3 | 2609 | |
0fcedd9c JM |
2610 | /* [class.ctor] |
2611 | ||
2612 | If there is no user-declared constructor for a class, a default | |
2613 | constructor is implicitly declared. */ | |
2614 | if (! TYPE_HAS_USER_CONSTRUCTOR (t)) | |
61a127b3 | 2615 | { |
508a1c9c MM |
2616 | TYPE_HAS_DEFAULT_CONSTRUCTOR (t) = 1; |
2617 | CLASSTYPE_LAZY_DEFAULT_CTOR (t) = 1; | |
61a127b3 MM |
2618 | } |
2619 | ||
0fcedd9c JM |
2620 | /* [class.ctor] |
2621 | ||
2622 | If a class definition does not explicitly declare a copy | |
2623 | constructor, one is declared implicitly. */ | |
6eabb241 | 2624 | if (! TYPE_HAS_INIT_REF (t) && ! TYPE_FOR_JAVA (t)) |
61a127b3 | 2625 | { |
508a1c9c MM |
2626 | TYPE_HAS_INIT_REF (t) = 1; |
2627 | TYPE_HAS_CONST_INIT_REF (t) = !cant_have_const_cctor; | |
2628 | CLASSTYPE_LAZY_COPY_CTOR (t) = 1; | |
61a127b3 MM |
2629 | } |
2630 | ||
aaaa46d2 MM |
2631 | /* If there is no assignment operator, one will be created if and |
2632 | when it is needed. For now, just record whether or not the type | |
2633 | of the parameter to the assignment operator will be a const or | |
2634 | non-const reference. */ | |
2635 | if (!TYPE_HAS_ASSIGN_REF (t) && !TYPE_FOR_JAVA (t)) | |
fb232476 MM |
2636 | { |
2637 | TYPE_HAS_ASSIGN_REF (t) = 1; | |
2638 | TYPE_HAS_CONST_ASSIGN_REF (t) = !cant_have_const_assignment; | |
2639 | CLASSTYPE_LAZY_ASSIGNMENT_OP (t) = 1; | |
2640 | } | |
61a127b3 MM |
2641 | } |
2642 | ||
f90cdf34 MT |
2643 | /* Subroutine of finish_struct_1. Recursively count the number of fields |
2644 | in TYPE, including anonymous union members. */ | |
2645 | ||
2646 | static int | |
94edc4ab | 2647 | count_fields (tree fields) |
f90cdf34 MT |
2648 | { |
2649 | tree x; | |
2650 | int n_fields = 0; | |
2651 | for (x = fields; x; x = TREE_CHAIN (x)) | |
2652 | { | |
2653 | if (TREE_CODE (x) == FIELD_DECL && ANON_AGGR_TYPE_P (TREE_TYPE (x))) | |
2654 | n_fields += count_fields (TYPE_FIELDS (TREE_TYPE (x))); | |
2655 | else | |
2656 | n_fields += 1; | |
2657 | } | |
2658 | return n_fields; | |
2659 | } | |
2660 | ||
2661 | /* Subroutine of finish_struct_1. Recursively add all the fields in the | |
d07605f5 | 2662 | TREE_LIST FIELDS to the SORTED_FIELDS_TYPE elts, starting at offset IDX. */ |
f90cdf34 MT |
2663 | |
2664 | static int | |
d07605f5 | 2665 | add_fields_to_record_type (tree fields, struct sorted_fields_type *field_vec, int idx) |
f90cdf34 MT |
2666 | { |
2667 | tree x; | |
2668 | for (x = fields; x; x = TREE_CHAIN (x)) | |
2669 | { | |
2670 | if (TREE_CODE (x) == FIELD_DECL && ANON_AGGR_TYPE_P (TREE_TYPE (x))) | |
d07605f5 | 2671 | idx = add_fields_to_record_type (TYPE_FIELDS (TREE_TYPE (x)), field_vec, idx); |
f90cdf34 | 2672 | else |
d07605f5 | 2673 | field_vec->elts[idx++] = x; |
f90cdf34 MT |
2674 | } |
2675 | return idx; | |
2676 | } | |
2677 | ||
1e30f9b4 MM |
2678 | /* FIELD is a bit-field. We are finishing the processing for its |
2679 | enclosing type. Issue any appropriate messages and set appropriate | |
e7df0180 | 2680 | flags. Returns false if an error has been diagnosed. */ |
1e30f9b4 | 2681 | |
e7df0180 | 2682 | static bool |
94edc4ab | 2683 | check_bitfield_decl (tree field) |
1e30f9b4 MM |
2684 | { |
2685 | tree type = TREE_TYPE (field); | |
606791f6 MM |
2686 | tree w; |
2687 | ||
2688 | /* Extract the declared width of the bitfield, which has been | |
2689 | temporarily stashed in DECL_INITIAL. */ | |
2690 | w = DECL_INITIAL (field); | |
3db45ab5 | 2691 | gcc_assert (w != NULL_TREE); |
606791f6 MM |
2692 | /* Remove the bit-field width indicator so that the rest of the |
2693 | compiler does not treat that value as an initializer. */ | |
2694 | DECL_INITIAL (field) = NULL_TREE; | |
1e30f9b4 | 2695 | |
cd8ed629 | 2696 | /* Detect invalid bit-field type. */ |
606791f6 | 2697 | if (!INTEGRAL_TYPE_P (type)) |
1e30f9b4 | 2698 | { |
dee15844 | 2699 | error ("bit-field %q+#D with non-integral type", field); |
cd8ed629 | 2700 | w = error_mark_node; |
1e30f9b4 | 2701 | } |
606791f6 | 2702 | else |
1e30f9b4 | 2703 | { |
1e30f9b4 MM |
2704 | /* Avoid the non_lvalue wrapper added by fold for PLUS_EXPRs. */ |
2705 | STRIP_NOPS (w); | |
2706 | ||
2707 | /* detect invalid field size. */ | |
8a784e4a | 2708 | w = integral_constant_value (w); |
1e30f9b4 MM |
2709 | |
2710 | if (TREE_CODE (w) != INTEGER_CST) | |
2711 | { | |
dee15844 | 2712 | error ("bit-field %q+D width not an integer constant", field); |
cd8ed629 | 2713 | w = error_mark_node; |
1e30f9b4 | 2714 | } |
05bccae2 | 2715 | else if (tree_int_cst_sgn (w) < 0) |
1e30f9b4 | 2716 | { |
dee15844 | 2717 | error ("negative width in bit-field %q+D", field); |
cd8ed629 | 2718 | w = error_mark_node; |
1e30f9b4 | 2719 | } |
05bccae2 | 2720 | else if (integer_zerop (w) && DECL_NAME (field) != 0) |
1e30f9b4 | 2721 | { |
dee15844 | 2722 | error ("zero width for bit-field %q+D", field); |
cd8ed629 | 2723 | w = error_mark_node; |
1e30f9b4 | 2724 | } |
05bccae2 | 2725 | else if (compare_tree_int (w, TYPE_PRECISION (type)) > 0 |
1e30f9b4 MM |
2726 | && TREE_CODE (type) != ENUMERAL_TYPE |
2727 | && TREE_CODE (type) != BOOLEAN_TYPE) | |
dee15844 | 2728 | warning (0, "width of %q+D exceeds its type", field); |
1e30f9b4 | 2729 | else if (TREE_CODE (type) == ENUMERAL_TYPE |
05bccae2 | 2730 | && (0 > compare_tree_int (w, |
cdd6a337 MLI |
2731 | tree_int_cst_min_precision |
2732 | (TYPE_MIN_VALUE (type), | |
2733 | TYPE_UNSIGNED (type))) | |
05bccae2 | 2734 | || 0 > compare_tree_int (w, |
cdd6a337 | 2735 | tree_int_cst_min_precision |
05bccae2 | 2736 | (TYPE_MAX_VALUE (type), |
8df83eae | 2737 | TYPE_UNSIGNED (type))))) |
dee15844 | 2738 | warning (0, "%q+D is too small to hold all values of %q#T", field, type); |
cd8ed629 | 2739 | } |
c8094d83 | 2740 | |
cd8ed629 MM |
2741 | if (w != error_mark_node) |
2742 | { | |
2743 | DECL_SIZE (field) = convert (bitsizetype, w); | |
2744 | DECL_BIT_FIELD (field) = 1; | |
e7df0180 | 2745 | return true; |
1e30f9b4 MM |
2746 | } |
2747 | else | |
cd8ed629 MM |
2748 | { |
2749 | /* Non-bit-fields are aligned for their type. */ | |
2750 | DECL_BIT_FIELD (field) = 0; | |
2751 | CLEAR_DECL_C_BIT_FIELD (field); | |
e7df0180 | 2752 | return false; |
cd8ed629 | 2753 | } |
1e30f9b4 MM |
2754 | } |
2755 | ||
2756 | /* FIELD is a non bit-field. We are finishing the processing for its | |
2757 | enclosing type T. Issue any appropriate messages and set appropriate | |
2758 | flags. */ | |
2759 | ||
2760 | static void | |
94edc4ab | 2761 | check_field_decl (tree field, |
0cbd7506 MS |
2762 | tree t, |
2763 | int* cant_have_const_ctor, | |
2764 | int* no_const_asn_ref, | |
94edc4ab | 2765 | int* any_default_members) |
1e30f9b4 MM |
2766 | { |
2767 | tree type = strip_array_types (TREE_TYPE (field)); | |
2768 | ||
2769 | /* An anonymous union cannot contain any fields which would change | |
2770 | the settings of CANT_HAVE_CONST_CTOR and friends. */ | |
2771 | if (ANON_UNION_TYPE_P (type)) | |
2772 | ; | |
2773 | /* And, we don't set TYPE_HAS_CONST_INIT_REF, etc., for anonymous | |
2774 | structs. So, we recurse through their fields here. */ | |
2775 | else if (ANON_AGGR_TYPE_P (type)) | |
2776 | { | |
2777 | tree fields; | |
2778 | ||
2779 | for (fields = TYPE_FIELDS (type); fields; fields = TREE_CHAIN (fields)) | |
17aec3eb | 2780 | if (TREE_CODE (fields) == FIELD_DECL && !DECL_C_BIT_FIELD (field)) |
1e30f9b4 | 2781 | check_field_decl (fields, t, cant_have_const_ctor, |
e5e459bf | 2782 | no_const_asn_ref, any_default_members); |
1e30f9b4 MM |
2783 | } |
2784 | /* Check members with class type for constructors, destructors, | |
2785 | etc. */ | |
2786 | else if (CLASS_TYPE_P (type)) | |
2787 | { | |
2788 | /* Never let anything with uninheritable virtuals | |
2789 | make it through without complaint. */ | |
2790 | abstract_virtuals_error (field, type); | |
c8094d83 | 2791 | |
1e30f9b4 MM |
2792 | if (TREE_CODE (t) == UNION_TYPE) |
2793 | { | |
2794 | if (TYPE_NEEDS_CONSTRUCTING (type)) | |
dee15844 JM |
2795 | error ("member %q+#D with constructor not allowed in union", |
2796 | field); | |
834c6dff | 2797 | if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type)) |
dee15844 | 2798 | error ("member %q+#D with destructor not allowed in union", field); |
1e30f9b4 | 2799 | if (TYPE_HAS_COMPLEX_ASSIGN_REF (type)) |
dee15844 JM |
2800 | error ("member %q+#D with copy assignment operator not allowed in union", |
2801 | field); | |
1e30f9b4 MM |
2802 | } |
2803 | else | |
2804 | { | |
2805 | TYPE_NEEDS_CONSTRUCTING (t) |= TYPE_NEEDS_CONSTRUCTING (type); | |
c8094d83 | 2806 | TYPE_HAS_NONTRIVIAL_DESTRUCTOR (t) |
834c6dff | 2807 | |= TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type); |
1e30f9b4 MM |
2808 | TYPE_HAS_COMPLEX_ASSIGN_REF (t) |= TYPE_HAS_COMPLEX_ASSIGN_REF (type); |
2809 | TYPE_HAS_COMPLEX_INIT_REF (t) |= TYPE_HAS_COMPLEX_INIT_REF (type); | |
cb68ec50 | 2810 | TYPE_HAS_COMPLEX_DFLT (t) |= TYPE_HAS_COMPLEX_DFLT (type); |
1e30f9b4 MM |
2811 | } |
2812 | ||
2813 | if (!TYPE_HAS_CONST_INIT_REF (type)) | |
2814 | *cant_have_const_ctor = 1; | |
2815 | ||
2816 | if (!TYPE_HAS_CONST_ASSIGN_REF (type)) | |
2817 | *no_const_asn_ref = 1; | |
1e30f9b4 MM |
2818 | } |
2819 | if (DECL_INITIAL (field) != NULL_TREE) | |
2820 | { | |
2821 | /* `build_class_init_list' does not recognize | |
2822 | non-FIELD_DECLs. */ | |
2823 | if (TREE_CODE (t) == UNION_TYPE && any_default_members != 0) | |
1f070f2b | 2824 | error ("multiple fields in union %qT initialized", t); |
1e30f9b4 MM |
2825 | *any_default_members = 1; |
2826 | } | |
6bb88f3b | 2827 | } |
1e30f9b4 | 2828 | |
08b962b0 MM |
2829 | /* Check the data members (both static and non-static), class-scoped |
2830 | typedefs, etc., appearing in the declaration of T. Issue | |
2831 | appropriate diagnostics. Sets ACCESS_DECLS to a list (in | |
2832 | declaration order) of access declarations; each TREE_VALUE in this | |
2833 | list is a USING_DECL. | |
8d08fdba | 2834 | |
08b962b0 | 2835 | In addition, set the following flags: |
8d08fdba | 2836 | |
08b962b0 MM |
2837 | EMPTY_P |
2838 | The class is empty, i.e., contains no non-static data members. | |
8d08fdba | 2839 | |
08b962b0 MM |
2840 | CANT_HAVE_CONST_CTOR_P |
2841 | This class cannot have an implicitly generated copy constructor | |
2842 | taking a const reference. | |
8d08fdba | 2843 | |
08b962b0 MM |
2844 | CANT_HAVE_CONST_ASN_REF |
2845 | This class cannot have an implicitly generated assignment | |
2846 | operator taking a const reference. | |
8d08fdba | 2847 | |
08b962b0 MM |
2848 | All of these flags should be initialized before calling this |
2849 | function. | |
8d08fdba | 2850 | |
08b962b0 MM |
2851 | Returns a pointer to the end of the TYPE_FIELDs chain; additional |
2852 | fields can be added by adding to this chain. */ | |
8d08fdba | 2853 | |
607cf131 | 2854 | static void |
58731fd1 | 2855 | check_field_decls (tree t, tree *access_decls, |
58731fd1 MM |
2856 | int *cant_have_const_ctor_p, |
2857 | int *no_const_asn_ref_p) | |
08b962b0 MM |
2858 | { |
2859 | tree *field; | |
2860 | tree *next; | |
dd29d26b | 2861 | bool has_pointers; |
08b962b0 | 2862 | int any_default_members; |
22002050 | 2863 | int cant_pack = 0; |
08b962b0 MM |
2864 | |
2865 | /* Assume there are no access declarations. */ | |
2866 | *access_decls = NULL_TREE; | |
2867 | /* Assume this class has no pointer members. */ | |
dd29d26b | 2868 | has_pointers = false; |
08b962b0 MM |
2869 | /* Assume none of the members of this class have default |
2870 | initializations. */ | |
2871 | any_default_members = 0; | |
2872 | ||
2873 | for (field = &TYPE_FIELDS (t); *field; field = next) | |
8d08fdba | 2874 | { |
08b962b0 MM |
2875 | tree x = *field; |
2876 | tree type = TREE_TYPE (x); | |
8d08fdba | 2877 | |
08b962b0 | 2878 | next = &TREE_CHAIN (x); |
8d08fdba | 2879 | |
cffa8729 | 2880 | if (TREE_CODE (x) == USING_DECL) |
f30432d7 | 2881 | { |
08b962b0 MM |
2882 | /* Prune the access declaration from the list of fields. */ |
2883 | *field = TREE_CHAIN (x); | |
2884 | ||
2885 | /* Save the access declarations for our caller. */ | |
2886 | *access_decls = tree_cons (NULL_TREE, x, *access_decls); | |
2887 | ||
2888 | /* Since we've reset *FIELD there's no reason to skip to the | |
2889 | next field. */ | |
2890 | next = field; | |
f30432d7 MS |
2891 | continue; |
2892 | } | |
8d08fdba | 2893 | |
050367a3 MM |
2894 | if (TREE_CODE (x) == TYPE_DECL |
2895 | || TREE_CODE (x) == TEMPLATE_DECL) | |
f30432d7 | 2896 | continue; |
8d08fdba | 2897 | |
f30432d7 | 2898 | /* If we've gotten this far, it's a data member, possibly static, |
e92cc029 | 2899 | or an enumerator. */ |
17aec3eb | 2900 | DECL_CONTEXT (x) = t; |
8d08fdba | 2901 | |
58ec3cc5 MM |
2902 | /* When this goes into scope, it will be a non-local reference. */ |
2903 | DECL_NONLOCAL (x) = 1; | |
2904 | ||
2905 | if (TREE_CODE (t) == UNION_TYPE) | |
2906 | { | |
2907 | /* [class.union] | |
2908 | ||
2909 | If a union contains a static data member, or a member of | |
324f9dfb | 2910 | reference type, the program is ill-formed. */ |
58ec3cc5 MM |
2911 | if (TREE_CODE (x) == VAR_DECL) |
2912 | { | |
dee15844 | 2913 | error ("%q+D may not be static because it is a member of a union", x); |
58ec3cc5 MM |
2914 | continue; |
2915 | } | |
2916 | if (TREE_CODE (type) == REFERENCE_TYPE) | |
2917 | { | |
dee15844 JM |
2918 | error ("%q+D may not have reference type %qT because" |
2919 | " it is a member of a union", | |
2920 | x, type); | |
58ec3cc5 MM |
2921 | continue; |
2922 | } | |
2923 | } | |
2924 | ||
f30432d7 MS |
2925 | /* Perform error checking that did not get done in |
2926 | grokdeclarator. */ | |
52fb2769 | 2927 | if (TREE_CODE (type) == FUNCTION_TYPE) |
f30432d7 | 2928 | { |
dee15844 | 2929 | error ("field %q+D invalidly declared function type", x); |
52fb2769 NS |
2930 | type = build_pointer_type (type); |
2931 | TREE_TYPE (x) = type; | |
f30432d7 | 2932 | } |
52fb2769 | 2933 | else if (TREE_CODE (type) == METHOD_TYPE) |
f30432d7 | 2934 | { |
dee15844 | 2935 | error ("field %q+D invalidly declared method type", x); |
52fb2769 NS |
2936 | type = build_pointer_type (type); |
2937 | TREE_TYPE (x) = type; | |
f30432d7 | 2938 | } |
8d08fdba | 2939 | |
52fb2769 | 2940 | if (type == error_mark_node) |
f30432d7 | 2941 | continue; |
c8094d83 | 2942 | |
58ec3cc5 | 2943 | if (TREE_CODE (x) == CONST_DECL || TREE_CODE (x) == VAR_DECL) |
73a8adb6 | 2944 | continue; |
8d08fdba | 2945 | |
f30432d7 | 2946 | /* Now it can only be a FIELD_DECL. */ |
8d08fdba | 2947 | |
f30432d7 | 2948 | if (TREE_PRIVATE (x) || TREE_PROTECTED (x)) |
08b962b0 | 2949 | CLASSTYPE_NON_AGGREGATE (t) = 1; |
8d08fdba | 2950 | |
0fcedd9c | 2951 | /* If this is of reference type, check if it needs an init. */ |
52fb2769 | 2952 | if (TREE_CODE (type) == REFERENCE_TYPE) |
0cbd7506 | 2953 | { |
08b962b0 | 2954 | CLASSTYPE_NON_POD_P (t) = 1; |
f30432d7 | 2955 | if (DECL_INITIAL (x) == NULL_TREE) |
6eb35968 | 2956 | SET_CLASSTYPE_REF_FIELDS_NEED_INIT (t, 1); |
8d08fdba | 2957 | |
f30432d7 MS |
2958 | /* ARM $12.6.2: [A member initializer list] (or, for an |
2959 | aggregate, initialization by a brace-enclosed list) is the | |
2960 | only way to initialize nonstatic const and reference | |
2961 | members. */ | |
e349ee73 | 2962 | TYPE_HAS_COMPLEX_ASSIGN_REF (t) = 1; |
f30432d7 | 2963 | } |
8d08fdba | 2964 | |
1e30f9b4 | 2965 | type = strip_array_types (type); |
dd29d26b | 2966 | |
1937f939 JM |
2967 | if (TYPE_PACKED (t)) |
2968 | { | |
2969 | if (!pod_type_p (type) && !TYPE_PACKED (type)) | |
4666cd04 JM |
2970 | { |
2971 | warning | |
2972 | (0, | |
2973 | "ignoring packed attribute because of unpacked non-POD field %q+#D", | |
2974 | x); | |
22002050 | 2975 | cant_pack = 1; |
4666cd04 | 2976 | } |
2cd36c22 AN |
2977 | else if (DECL_C_BIT_FIELD (x) |
2978 | || TYPE_ALIGN (TREE_TYPE (x)) > BITS_PER_UNIT) | |
1937f939 JM |
2979 | DECL_PACKED (x) = 1; |
2980 | } | |
2981 | ||
2982 | if (DECL_C_BIT_FIELD (x) && integer_zerop (DECL_INITIAL (x))) | |
2983 | /* We don't treat zero-width bitfields as making a class | |
2984 | non-empty. */ | |
2985 | ; | |
2986 | else | |
2987 | { | |
2988 | /* The class is non-empty. */ | |
2989 | CLASSTYPE_EMPTY_P (t) = 0; | |
2990 | /* The class is not even nearly empty. */ | |
2991 | CLASSTYPE_NEARLY_EMPTY_P (t) = 0; | |
2992 | /* If one of the data members contains an empty class, | |
2993 | so does T. */ | |
2994 | if (CLASS_TYPE_P (type) | |
2995 | && CLASSTYPE_CONTAINS_EMPTY_CLASS_P (type)) | |
2996 | CLASSTYPE_CONTAINS_EMPTY_CLASS_P (t) = 1; | |
2997 | } | |
2998 | ||
dd29d26b GB |
2999 | /* This is used by -Weffc++ (see below). Warn only for pointers |
3000 | to members which might hold dynamic memory. So do not warn | |
3001 | for pointers to functions or pointers to members. */ | |
3002 | if (TYPE_PTR_P (type) | |
3003 | && !TYPE_PTRFN_P (type) | |
3004 | && !TYPE_PTR_TO_MEMBER_P (type)) | |
3005 | has_pointers = true; | |
824b9a4c | 3006 | |
58ec3cc5 MM |
3007 | if (CLASS_TYPE_P (type)) |
3008 | { | |
3009 | if (CLASSTYPE_REF_FIELDS_NEED_INIT (type)) | |
3010 | SET_CLASSTYPE_REF_FIELDS_NEED_INIT (t, 1); | |
3011 | if (CLASSTYPE_READONLY_FIELDS_NEED_INIT (type)) | |
3012 | SET_CLASSTYPE_READONLY_FIELDS_NEED_INIT (t, 1); | |
3013 | } | |
3014 | ||
52fb2769 | 3015 | if (DECL_MUTABLE_P (x) || TYPE_HAS_MUTABLE_P (type)) |
08b962b0 | 3016 | CLASSTYPE_HAS_MUTABLE (t) = 1; |
a7a7710d | 3017 | |
d282fcb2 | 3018 | if (! pod_type_p (type)) |
0cbd7506 MS |
3019 | /* DR 148 now allows pointers to members (which are POD themselves), |
3020 | to be allowed in POD structs. */ | |
08b962b0 | 3021 | CLASSTYPE_NON_POD_P (t) = 1; |
52fb2769 | 3022 | |
94e6e4c4 AO |
3023 | if (! zero_init_p (type)) |
3024 | CLASSTYPE_NON_ZERO_INIT_P (t) = 1; | |
3025 | ||
f30432d7 | 3026 | /* If any field is const, the structure type is pseudo-const. */ |
52fb2769 | 3027 | if (CP_TYPE_CONST_P (type)) |
f30432d7 MS |
3028 | { |
3029 | C_TYPE_FIELDS_READONLY (t) = 1; | |
3030 | if (DECL_INITIAL (x) == NULL_TREE) | |
6eb35968 | 3031 | SET_CLASSTYPE_READONLY_FIELDS_NEED_INIT (t, 1); |
f30432d7 MS |
3032 | |
3033 | /* ARM $12.6.2: [A member initializer list] (or, for an | |
3034 | aggregate, initialization by a brace-enclosed list) is the | |
3035 | only way to initialize nonstatic const and reference | |
3036 | members. */ | |
e349ee73 | 3037 | TYPE_HAS_COMPLEX_ASSIGN_REF (t) = 1; |
f30432d7 | 3038 | } |
08b962b0 | 3039 | /* A field that is pseudo-const makes the structure likewise. */ |
5552b43c | 3040 | else if (CLASS_TYPE_P (type)) |
f30432d7 | 3041 | { |
08b962b0 | 3042 | C_TYPE_FIELDS_READONLY (t) |= C_TYPE_FIELDS_READONLY (type); |
6eb35968 DE |
3043 | SET_CLASSTYPE_READONLY_FIELDS_NEED_INIT (t, |
3044 | CLASSTYPE_READONLY_FIELDS_NEED_INIT (t) | |
3045 | | CLASSTYPE_READONLY_FIELDS_NEED_INIT (type)); | |
f30432d7 | 3046 | } |
8d08fdba | 3047 | |
c10bffd0 JM |
3048 | /* Core issue 80: A nonstatic data member is required to have a |
3049 | different name from the class iff the class has a | |
b87d79e6 | 3050 | user-declared constructor. */ |
0fcedd9c JM |
3051 | if (constructor_name_p (DECL_NAME (x), t) |
3052 | && TYPE_HAS_USER_CONSTRUCTOR (t)) | |
cbe5f3b3 | 3053 | permerror (input_location, "field %q+#D with same name as class", x); |
c10bffd0 | 3054 | |
162bc98d JM |
3055 | /* We set DECL_C_BIT_FIELD in grokbitfield. |
3056 | If the type and width are valid, we'll also set DECL_BIT_FIELD. */ | |
e7df0180 | 3057 | if (! DECL_C_BIT_FIELD (x) || ! check_bitfield_decl (x)) |
1e30f9b4 | 3058 | check_field_decl (x, t, |
08b962b0 | 3059 | cant_have_const_ctor_p, |
08b962b0 | 3060 | no_const_asn_ref_p, |
1e30f9b4 | 3061 | &any_default_members); |
8d08fdba MS |
3062 | } |
3063 | ||
dd29d26b GB |
3064 | /* Effective C++ rule 11: if a class has dynamic memory held by pointers, |
3065 | it should also define a copy constructor and an assignment operator to | |
3066 | implement the correct copy semantic (deep vs shallow, etc.). As it is | |
3067 | not feasible to check whether the constructors do allocate dynamic memory | |
3068 | and store it within members, we approximate the warning like this: | |
3069 | ||
3070 | -- Warn only if there are members which are pointers | |
3071 | -- Warn only if there is a non-trivial constructor (otherwise, | |
3072 | there cannot be memory allocated). | |
3073 | -- Warn only if there is a non-trivial destructor. We assume that the | |
3074 | user at least implemented the cleanup correctly, and a destructor | |
3075 | is needed to free dynamic memory. | |
c8094d83 | 3076 | |
77880ae4 | 3077 | This seems enough for practical purposes. */ |
22002050 JM |
3078 | if (warn_ecpp |
3079 | && has_pointers | |
0fcedd9c | 3080 | && TYPE_HAS_USER_CONSTRUCTOR (t) |
22002050 JM |
3081 | && TYPE_HAS_NONTRIVIAL_DESTRUCTOR (t) |
3082 | && !(TYPE_HAS_INIT_REF (t) && TYPE_HAS_ASSIGN_REF (t))) | |
824b9a4c | 3083 | { |
b323323f | 3084 | warning (OPT_Weffc__, "%q#T has pointer data members", t); |
c8094d83 | 3085 | |
824b9a4c MS |
3086 | if (! TYPE_HAS_INIT_REF (t)) |
3087 | { | |
74fa0285 | 3088 | warning (OPT_Weffc__, |
3db45ab5 | 3089 | " but does not override %<%T(const %T&)%>", t, t); |
74fa0285 GDR |
3090 | if (!TYPE_HAS_ASSIGN_REF (t)) |
3091 | warning (OPT_Weffc__, " or %<operator=(const %T&)%>", t); | |
824b9a4c MS |
3092 | } |
3093 | else if (! TYPE_HAS_ASSIGN_REF (t)) | |
74fa0285 | 3094 | warning (OPT_Weffc__, |
3db45ab5 | 3095 | " but does not override %<operator=(const %T&)%>", t); |
824b9a4c | 3096 | } |
08b962b0 | 3097 | |
22002050 JM |
3098 | /* If any of the fields couldn't be packed, unset TYPE_PACKED. */ |
3099 | if (cant_pack) | |
3100 | TYPE_PACKED (t) = 0; | |
607cf131 MM |
3101 | |
3102 | /* Check anonymous struct/anonymous union fields. */ | |
3103 | finish_struct_anon (t); | |
3104 | ||
08b962b0 MM |
3105 | /* We've built up the list of access declarations in reverse order. |
3106 | Fix that now. */ | |
3107 | *access_decls = nreverse (*access_decls); | |
08b962b0 MM |
3108 | } |
3109 | ||
c20118a8 MM |
3110 | /* If TYPE is an empty class type, records its OFFSET in the table of |
3111 | OFFSETS. */ | |
607cf131 | 3112 | |
c20118a8 | 3113 | static int |
94edc4ab | 3114 | record_subobject_offset (tree type, tree offset, splay_tree offsets) |
5c24fba6 | 3115 | { |
c20118a8 | 3116 | splay_tree_node n; |
5c24fba6 | 3117 | |
c20118a8 MM |
3118 | if (!is_empty_class (type)) |
3119 | return 0; | |
5c24fba6 | 3120 | |
c20118a8 MM |
3121 | /* Record the location of this empty object in OFFSETS. */ |
3122 | n = splay_tree_lookup (offsets, (splay_tree_key) offset); | |
3123 | if (!n) | |
c8094d83 | 3124 | n = splay_tree_insert (offsets, |
c20118a8 MM |
3125 | (splay_tree_key) offset, |
3126 | (splay_tree_value) NULL_TREE); | |
c8094d83 | 3127 | n->value = ((splay_tree_value) |
c20118a8 MM |
3128 | tree_cons (NULL_TREE, |
3129 | type, | |
3130 | (tree) n->value)); | |
3131 | ||
3132 | return 0; | |
607cf131 MM |
3133 | } |
3134 | ||
838dfd8a | 3135 | /* Returns nonzero if TYPE is an empty class type and there is |
c20118a8 | 3136 | already an entry in OFFSETS for the same TYPE as the same OFFSET. */ |
9785e4b1 | 3137 | |
c20118a8 | 3138 | static int |
94edc4ab | 3139 | check_subobject_offset (tree type, tree offset, splay_tree offsets) |
9785e4b1 | 3140 | { |
c20118a8 MM |
3141 | splay_tree_node n; |
3142 | tree t; | |
3143 | ||
3144 | if (!is_empty_class (type)) | |
3145 | return 0; | |
3146 | ||
3147 | /* Record the location of this empty object in OFFSETS. */ | |
3148 | n = splay_tree_lookup (offsets, (splay_tree_key) offset); | |
3149 | if (!n) | |
3150 | return 0; | |
3151 | ||
3152 | for (t = (tree) n->value; t; t = TREE_CHAIN (t)) | |
3153 | if (same_type_p (TREE_VALUE (t), type)) | |
3154 | return 1; | |
3155 | ||
3156 | return 0; | |
9785e4b1 MM |
3157 | } |
3158 | ||
c20118a8 MM |
3159 | /* Walk through all the subobjects of TYPE (located at OFFSET). Call |
3160 | F for every subobject, passing it the type, offset, and table of | |
2003cd37 MM |
3161 | OFFSETS. If VBASES_P is one, then virtual non-primary bases should |
3162 | be traversed. | |
5cdba4ff MM |
3163 | |
3164 | If MAX_OFFSET is non-NULL, then subobjects with an offset greater | |
3165 | than MAX_OFFSET will not be walked. | |
3166 | ||
838dfd8a | 3167 | If F returns a nonzero value, the traversal ceases, and that value |
5cdba4ff | 3168 | is returned. Otherwise, returns zero. */ |
d77249e7 | 3169 | |
c20118a8 | 3170 | static int |
c8094d83 | 3171 | walk_subobject_offsets (tree type, |
0cbd7506 MS |
3172 | subobject_offset_fn f, |
3173 | tree offset, | |
3174 | splay_tree offsets, | |
3175 | tree max_offset, | |
3176 | int vbases_p) | |
5c24fba6 | 3177 | { |
c20118a8 | 3178 | int r = 0; |
ff944b49 | 3179 | tree type_binfo = NULL_TREE; |
c20118a8 | 3180 | |
5cdba4ff MM |
3181 | /* If this OFFSET is bigger than the MAX_OFFSET, then we should |
3182 | stop. */ | |
3183 | if (max_offset && INT_CST_LT (max_offset, offset)) | |
3184 | return 0; | |
3185 | ||
dbe91deb NS |
3186 | if (type == error_mark_node) |
3187 | return 0; | |
3db45ab5 | 3188 | |
c8094d83 | 3189 | if (!TYPE_P (type)) |
ff944b49 MM |
3190 | { |
3191 | if (abi_version_at_least (2)) | |
3192 | type_binfo = type; | |
3193 | type = BINFO_TYPE (type); | |
3194 | } | |
3195 | ||
c20118a8 | 3196 | if (CLASS_TYPE_P (type)) |
5c24fba6 | 3197 | { |
c20118a8 | 3198 | tree field; |
17bbb839 | 3199 | tree binfo; |
c20118a8 MM |
3200 | int i; |
3201 | ||
5ec1192e MM |
3202 | /* Avoid recursing into objects that are not interesting. */ |
3203 | if (!CLASSTYPE_CONTAINS_EMPTY_CLASS_P (type)) | |
3204 | return 0; | |
3205 | ||
c20118a8 MM |
3206 | /* Record the location of TYPE. */ |
3207 | r = (*f) (type, offset, offsets); | |
3208 | if (r) | |
3209 | return r; | |
3210 | ||
3211 | /* Iterate through the direct base classes of TYPE. */ | |
ff944b49 MM |
3212 | if (!type_binfo) |
3213 | type_binfo = TYPE_BINFO (type); | |
fa743e8c | 3214 | for (i = 0; BINFO_BASE_ITERATE (type_binfo, i, binfo); i++) |
c20118a8 | 3215 | { |
ff944b49 MM |
3216 | tree binfo_offset; |
3217 | ||
c8094d83 | 3218 | if (abi_version_at_least (2) |
809e3e7f | 3219 | && BINFO_VIRTUAL_P (binfo)) |
17bbb839 | 3220 | continue; |
5c24fba6 | 3221 | |
c8094d83 MS |
3222 | if (!vbases_p |
3223 | && BINFO_VIRTUAL_P (binfo) | |
9965d119 | 3224 | && !BINFO_PRIMARY_P (binfo)) |
c20118a8 MM |
3225 | continue; |
3226 | ||
ff944b49 MM |
3227 | if (!abi_version_at_least (2)) |
3228 | binfo_offset = size_binop (PLUS_EXPR, | |
3229 | offset, | |
3230 | BINFO_OFFSET (binfo)); | |
3231 | else | |
3232 | { | |
3233 | tree orig_binfo; | |
3234 | /* We cannot rely on BINFO_OFFSET being set for the base | |
3235 | class yet, but the offsets for direct non-virtual | |
3236 | bases can be calculated by going back to the TYPE. */ | |
604a3205 | 3237 | orig_binfo = BINFO_BASE_BINFO (TYPE_BINFO (type), i); |
c8094d83 | 3238 | binfo_offset = size_binop (PLUS_EXPR, |
ff944b49 MM |
3239 | offset, |
3240 | BINFO_OFFSET (orig_binfo)); | |
3241 | } | |
3242 | ||
3243 | r = walk_subobject_offsets (binfo, | |
c20118a8 | 3244 | f, |
ff944b49 | 3245 | binfo_offset, |
c20118a8 | 3246 | offsets, |
5cdba4ff | 3247 | max_offset, |
c8094d83 | 3248 | (abi_version_at_least (2) |
17bbb839 | 3249 | ? /*vbases_p=*/0 : vbases_p)); |
c20118a8 MM |
3250 | if (r) |
3251 | return r; | |
3252 | } | |
3253 | ||
58c42dc2 | 3254 | if (abi_version_at_least (2) && CLASSTYPE_VBASECLASSES (type)) |
17bbb839 | 3255 | { |
58c42dc2 | 3256 | unsigned ix; |
d4e6fecb | 3257 | VEC(tree,gc) *vbases; |
17bbb839 | 3258 | |
ff944b49 MM |
3259 | /* Iterate through the virtual base classes of TYPE. In G++ |
3260 | 3.2, we included virtual bases in the direct base class | |
3261 | loop above, which results in incorrect results; the | |
3262 | correct offsets for virtual bases are only known when | |
3263 | working with the most derived type. */ | |
3264 | if (vbases_p) | |
9ba5ff0f NS |
3265 | for (vbases = CLASSTYPE_VBASECLASSES (type), ix = 0; |
3266 | VEC_iterate (tree, vbases, ix, binfo); ix++) | |
ff944b49 | 3267 | { |
ff944b49 MM |
3268 | r = walk_subobject_offsets (binfo, |
3269 | f, | |
3270 | size_binop (PLUS_EXPR, | |
3271 | offset, | |
3272 | BINFO_OFFSET (binfo)), | |
3273 | offsets, | |
3274 | max_offset, | |
3275 | /*vbases_p=*/0); | |
3276 | if (r) | |
3277 | return r; | |
3278 | } | |
3279 | else | |
17bbb839 | 3280 | { |
ff944b49 MM |
3281 | /* We still have to walk the primary base, if it is |
3282 | virtual. (If it is non-virtual, then it was walked | |
3283 | above.) */ | |
58c42dc2 | 3284 | tree vbase = get_primary_binfo (type_binfo); |
c8094d83 | 3285 | |
809e3e7f | 3286 | if (vbase && BINFO_VIRTUAL_P (vbase) |
fc6633e0 NS |
3287 | && BINFO_PRIMARY_P (vbase) |
3288 | && BINFO_INHERITANCE_CHAIN (vbase) == type_binfo) | |
ff944b49 | 3289 | { |
c8094d83 | 3290 | r = (walk_subobject_offsets |
dbbf88d1 NS |
3291 | (vbase, f, offset, |
3292 | offsets, max_offset, /*vbases_p=*/0)); | |
3293 | if (r) | |
3294 | return r; | |
ff944b49 | 3295 | } |
17bbb839 MM |
3296 | } |
3297 | } | |
3298 | ||
c20118a8 MM |
3299 | /* Iterate through the fields of TYPE. */ |
3300 | for (field = TYPE_FIELDS (type); field; field = TREE_CHAIN (field)) | |
17bbb839 | 3301 | if (TREE_CODE (field) == FIELD_DECL && !DECL_ARTIFICIAL (field)) |
c20118a8 | 3302 | { |
956d9305 MM |
3303 | tree field_offset; |
3304 | ||
3305 | if (abi_version_at_least (2)) | |
3306 | field_offset = byte_position (field); | |
3307 | else | |
3308 | /* In G++ 3.2, DECL_FIELD_OFFSET was used. */ | |
3309 | field_offset = DECL_FIELD_OFFSET (field); | |
3310 | ||
c20118a8 MM |
3311 | r = walk_subobject_offsets (TREE_TYPE (field), |
3312 | f, | |
3313 | size_binop (PLUS_EXPR, | |
3314 | offset, | |
956d9305 | 3315 | field_offset), |
c20118a8 | 3316 | offsets, |
5cdba4ff | 3317 | max_offset, |
c20118a8 MM |
3318 | /*vbases_p=*/1); |
3319 | if (r) | |
3320 | return r; | |
3321 | } | |
5c24fba6 | 3322 | } |
c20118a8 MM |
3323 | else if (TREE_CODE (type) == ARRAY_TYPE) |
3324 | { | |
5ec1192e | 3325 | tree element_type = strip_array_types (type); |
c20118a8 MM |
3326 | tree domain = TYPE_DOMAIN (type); |
3327 | tree index; | |
5c24fba6 | 3328 | |
5ec1192e MM |
3329 | /* Avoid recursing into objects that are not interesting. */ |
3330 | if (!CLASS_TYPE_P (element_type) | |
3331 | || !CLASSTYPE_CONTAINS_EMPTY_CLASS_P (element_type)) | |
3332 | return 0; | |
3333 | ||
c20118a8 | 3334 | /* Step through each of the elements in the array. */ |
17bbb839 MM |
3335 | for (index = size_zero_node; |
3336 | /* G++ 3.2 had an off-by-one error here. */ | |
c8094d83 | 3337 | (abi_version_at_least (2) |
17bbb839 MM |
3338 | ? !INT_CST_LT (TYPE_MAX_VALUE (domain), index) |
3339 | : INT_CST_LT (index, TYPE_MAX_VALUE (domain))); | |
c20118a8 MM |
3340 | index = size_binop (PLUS_EXPR, index, size_one_node)) |
3341 | { | |
3342 | r = walk_subobject_offsets (TREE_TYPE (type), | |
3343 | f, | |
3344 | offset, | |
3345 | offsets, | |
5cdba4ff | 3346 | max_offset, |
c20118a8 MM |
3347 | /*vbases_p=*/1); |
3348 | if (r) | |
3349 | return r; | |
c8094d83 | 3350 | offset = size_binop (PLUS_EXPR, offset, |
c20118a8 | 3351 | TYPE_SIZE_UNIT (TREE_TYPE (type))); |
5cdba4ff MM |
3352 | /* If this new OFFSET is bigger than the MAX_OFFSET, then |
3353 | there's no point in iterating through the remaining | |
3354 | elements of the array. */ | |
3355 | if (max_offset && INT_CST_LT (max_offset, offset)) | |
3356 | break; | |
c20118a8 MM |
3357 | } |
3358 | } | |
3359 | ||
3360 | return 0; | |
3361 | } | |
3362 | ||
c0572427 MM |
3363 | /* Record all of the empty subobjects of TYPE (either a type or a |
3364 | binfo). If IS_DATA_MEMBER is true, then a non-static data member | |
c5a35c3c MM |
3365 | is being placed at OFFSET; otherwise, it is a base class that is |
3366 | being placed at OFFSET. */ | |
c20118a8 MM |
3367 | |
3368 | static void | |
c8094d83 | 3369 | record_subobject_offsets (tree type, |
0cbd7506 MS |
3370 | tree offset, |
3371 | splay_tree offsets, | |
c5a35c3c | 3372 | bool is_data_member) |
c20118a8 | 3373 | { |
c5a35c3c | 3374 | tree max_offset; |
c0572427 MM |
3375 | /* If recording subobjects for a non-static data member or a |
3376 | non-empty base class , we do not need to record offsets beyond | |
3377 | the size of the biggest empty class. Additional data members | |
3378 | will go at the end of the class. Additional base classes will go | |
3379 | either at offset zero (if empty, in which case they cannot | |
3380 | overlap with offsets past the size of the biggest empty class) or | |
3381 | at the end of the class. | |
3382 | ||
3383 | However, if we are placing an empty base class, then we must record | |
c5a35c3c MM |
3384 | all offsets, as either the empty class is at offset zero (where |
3385 | other empty classes might later be placed) or at the end of the | |
3386 | class (where other objects might then be placed, so other empty | |
3387 | subobjects might later overlap). */ | |
3db45ab5 | 3388 | if (is_data_member |
c0572427 | 3389 | || !is_empty_class (BINFO_TYPE (type))) |
c5a35c3c MM |
3390 | max_offset = sizeof_biggest_empty_class; |
3391 | else | |
3392 | max_offset = NULL_TREE; | |
c20118a8 | 3393 | walk_subobject_offsets (type, record_subobject_offset, offset, |
c5a35c3c | 3394 | offsets, max_offset, is_data_member); |
5c24fba6 MM |
3395 | } |
3396 | ||
838dfd8a KH |
3397 | /* Returns nonzero if any of the empty subobjects of TYPE (located at |
3398 | OFFSET) conflict with entries in OFFSETS. If VBASES_P is nonzero, | |
c20118a8 | 3399 | virtual bases of TYPE are examined. */ |
9785e4b1 MM |
3400 | |
3401 | static int | |
94edc4ab | 3402 | layout_conflict_p (tree type, |
0cbd7506 MS |
3403 | tree offset, |
3404 | splay_tree offsets, | |
3405 | int vbases_p) | |
9785e4b1 | 3406 | { |
5cdba4ff MM |
3407 | splay_tree_node max_node; |
3408 | ||
3409 | /* Get the node in OFFSETS that indicates the maximum offset where | |
3410 | an empty subobject is located. */ | |
3411 | max_node = splay_tree_max (offsets); | |
3412 | /* If there aren't any empty subobjects, then there's no point in | |
3413 | performing this check. */ | |
3414 | if (!max_node) | |
3415 | return 0; | |
3416 | ||
c20118a8 | 3417 | return walk_subobject_offsets (type, check_subobject_offset, offset, |
5cdba4ff MM |
3418 | offsets, (tree) (max_node->key), |
3419 | vbases_p); | |
9785e4b1 MM |
3420 | } |
3421 | ||
5c24fba6 MM |
3422 | /* DECL is a FIELD_DECL corresponding either to a base subobject of a |
3423 | non-static data member of the type indicated by RLI. BINFO is the | |
c20118a8 | 3424 | binfo corresponding to the base subobject, OFFSETS maps offsets to |
17bbb839 MM |
3425 | types already located at those offsets. This function determines |
3426 | the position of the DECL. */ | |
5c24fba6 MM |
3427 | |
3428 | static void | |
c8094d83 MS |
3429 | layout_nonempty_base_or_field (record_layout_info rli, |
3430 | tree decl, | |
3431 | tree binfo, | |
17bbb839 | 3432 | splay_tree offsets) |
5c24fba6 | 3433 | { |
c20118a8 | 3434 | tree offset = NULL_TREE; |
17bbb839 MM |
3435 | bool field_p; |
3436 | tree type; | |
c8094d83 | 3437 | |
17bbb839 MM |
3438 | if (binfo) |
3439 | { | |
3440 | /* For the purposes of determining layout conflicts, we want to | |
3441 | use the class type of BINFO; TREE_TYPE (DECL) will be the | |
3442 | CLASSTYPE_AS_BASE version, which does not contain entries for | |
3443 | zero-sized bases. */ | |
3444 | type = TREE_TYPE (binfo); | |
3445 | field_p = false; | |
3446 | } | |
3447 | else | |
3448 | { | |
3449 | type = TREE_TYPE (decl); | |
3450 | field_p = true; | |
3451 | } | |
c20118a8 | 3452 | |
5c24fba6 MM |
3453 | /* Try to place the field. It may take more than one try if we have |
3454 | a hard time placing the field without putting two objects of the | |
3455 | same type at the same address. */ | |
3456 | while (1) | |
3457 | { | |
defd0dea | 3458 | struct record_layout_info_s old_rli = *rli; |
5c24fba6 | 3459 | |
770ae6cc RK |
3460 | /* Place this field. */ |
3461 | place_field (rli, decl); | |
da3d4dfa | 3462 | offset = byte_position (decl); |
1e2e9f54 | 3463 | |
5c24fba6 MM |
3464 | /* We have to check to see whether or not there is already |
3465 | something of the same type at the offset we're about to use. | |
1e2e9f54 | 3466 | For example, consider: |
c8094d83 | 3467 | |
1e2e9f54 MM |
3468 | struct S {}; |
3469 | struct T : public S { int i; }; | |
3470 | struct U : public S, public T {}; | |
c8094d83 | 3471 | |
5c24fba6 MM |
3472 | Here, we put S at offset zero in U. Then, we can't put T at |
3473 | offset zero -- its S component would be at the same address | |
3474 | as the S we already allocated. So, we have to skip ahead. | |
3475 | Since all data members, including those whose type is an | |
838dfd8a | 3476 | empty class, have nonzero size, any overlap can happen only |
5c24fba6 MM |
3477 | with a direct or indirect base-class -- it can't happen with |
3478 | a data member. */ | |
1e2e9f54 MM |
3479 | /* In a union, overlap is permitted; all members are placed at |
3480 | offset zero. */ | |
3481 | if (TREE_CODE (rli->t) == UNION_TYPE) | |
3482 | break; | |
7ba539c6 MM |
3483 | /* G++ 3.2 did not check for overlaps when placing a non-empty |
3484 | virtual base. */ | |
809e3e7f | 3485 | if (!abi_version_at_least (2) && binfo && BINFO_VIRTUAL_P (binfo)) |
7ba539c6 | 3486 | break; |
c8094d83 | 3487 | if (layout_conflict_p (field_p ? type : binfo, offset, |
ff944b49 | 3488 | offsets, field_p)) |
5c24fba6 | 3489 | { |
5c24fba6 MM |
3490 | /* Strip off the size allocated to this field. That puts us |
3491 | at the first place we could have put the field with | |
3492 | proper alignment. */ | |
770ae6cc RK |
3493 | *rli = old_rli; |
3494 | ||
c20118a8 | 3495 | /* Bump up by the alignment required for the type. */ |
770ae6cc | 3496 | rli->bitpos |
c8094d83 MS |
3497 | = size_binop (PLUS_EXPR, rli->bitpos, |
3498 | bitsize_int (binfo | |
c20118a8 MM |
3499 | ? CLASSTYPE_ALIGN (type) |
3500 | : TYPE_ALIGN (type))); | |
770ae6cc | 3501 | normalize_rli (rli); |
5c24fba6 MM |
3502 | } |
3503 | else | |
3504 | /* There was no conflict. We're done laying out this field. */ | |
3505 | break; | |
3506 | } | |
c20118a8 | 3507 | |
623fe76a | 3508 | /* Now that we know where it will be placed, update its |
c20118a8 MM |
3509 | BINFO_OFFSET. */ |
3510 | if (binfo && CLASS_TYPE_P (BINFO_TYPE (binfo))) | |
90024bdc | 3511 | /* Indirect virtual bases may have a nonzero BINFO_OFFSET at |
17bbb839 MM |
3512 | this point because their BINFO_OFFSET is copied from another |
3513 | hierarchy. Therefore, we may not need to add the entire | |
3514 | OFFSET. */ | |
c8094d83 | 3515 | propagate_binfo_offsets (binfo, |
17bbb839 | 3516 | size_diffop (convert (ssizetype, offset), |
c8094d83 | 3517 | convert (ssizetype, |
dbbf88d1 | 3518 | BINFO_OFFSET (binfo)))); |
5c24fba6 MM |
3519 | } |
3520 | ||
90024bdc | 3521 | /* Returns true if TYPE is empty and OFFSET is nonzero. */ |
7ba539c6 MM |
3522 | |
3523 | static int | |
3524 | empty_base_at_nonzero_offset_p (tree type, | |
3525 | tree offset, | |
3526 | splay_tree offsets ATTRIBUTE_UNUSED) | |
3527 | { | |
3528 | return is_empty_class (type) && !integer_zerop (offset); | |
3529 | } | |
3530 | ||
9785e4b1 | 3531 | /* Layout the empty base BINFO. EOC indicates the byte currently just |
ec386958 | 3532 | past the end of the class, and should be correctly aligned for a |
c20118a8 | 3533 | class of the type indicated by BINFO; OFFSETS gives the offsets of |
623fe76a | 3534 | the empty bases allocated so far. T is the most derived |
838dfd8a | 3535 | type. Return nonzero iff we added it at the end. */ |
9785e4b1 | 3536 | |
06d9f09f | 3537 | static bool |
d9d9dbc0 JM |
3538 | layout_empty_base (record_layout_info rli, tree binfo, |
3539 | tree eoc, splay_tree offsets) | |
9785e4b1 | 3540 | { |
ec386958 | 3541 | tree alignment; |
9785e4b1 | 3542 | tree basetype = BINFO_TYPE (binfo); |
06d9f09f | 3543 | bool atend = false; |
956d9305 | 3544 | |
9785e4b1 | 3545 | /* This routine should only be used for empty classes. */ |
50bc768d | 3546 | gcc_assert (is_empty_class (basetype)); |
1b50716d | 3547 | alignment = ssize_int (CLASSTYPE_ALIGN_UNIT (basetype)); |
9785e4b1 | 3548 | |
3075b327 NS |
3549 | if (!integer_zerop (BINFO_OFFSET (binfo))) |
3550 | { | |
3551 | if (abi_version_at_least (2)) | |
3552 | propagate_binfo_offsets | |
3553 | (binfo, size_diffop (size_zero_node, BINFO_OFFSET (binfo))); | |
74fa0285 GDR |
3554 | else |
3555 | warning (OPT_Wabi, | |
3db45ab5 | 3556 | "offset of empty base %qT may not be ABI-compliant and may" |
3075b327 NS |
3557 | "change in a future version of GCC", |
3558 | BINFO_TYPE (binfo)); | |
3559 | } | |
c8094d83 | 3560 | |
9785e4b1 MM |
3561 | /* This is an empty base class. We first try to put it at offset |
3562 | zero. */ | |
ff944b49 | 3563 | if (layout_conflict_p (binfo, |
c20118a8 | 3564 | BINFO_OFFSET (binfo), |
c8094d83 | 3565 | offsets, |
c20118a8 | 3566 | /*vbases_p=*/0)) |
9785e4b1 MM |
3567 | { |
3568 | /* That didn't work. Now, we move forward from the next | |
3569 | available spot in the class. */ | |
06d9f09f | 3570 | atend = true; |
dbbf88d1 | 3571 | propagate_binfo_offsets (binfo, convert (ssizetype, eoc)); |
c8094d83 | 3572 | while (1) |
9785e4b1 | 3573 | { |
ff944b49 | 3574 | if (!layout_conflict_p (binfo, |
c8094d83 | 3575 | BINFO_OFFSET (binfo), |
c20118a8 MM |
3576 | offsets, |
3577 | /*vbases_p=*/0)) | |
9785e4b1 MM |
3578 | /* We finally found a spot where there's no overlap. */ |
3579 | break; | |
3580 | ||
3581 | /* There's overlap here, too. Bump along to the next spot. */ | |
dbbf88d1 | 3582 | propagate_binfo_offsets (binfo, alignment); |
9785e4b1 MM |
3583 | } |
3584 | } | |
d9d9dbc0 JM |
3585 | |
3586 | if (CLASSTYPE_USER_ALIGN (basetype)) | |
3587 | { | |
3588 | rli->record_align = MAX (rli->record_align, CLASSTYPE_ALIGN (basetype)); | |
3589 | if (warn_packed) | |
3590 | rli->unpacked_align = MAX (rli->unpacked_align, CLASSTYPE_ALIGN (basetype)); | |
3591 | TYPE_USER_ALIGN (rli->t) = 1; | |
3592 | } | |
3593 | ||
06d9f09f | 3594 | return atend; |
9785e4b1 MM |
3595 | } |
3596 | ||
78dcd41a | 3597 | /* Layout the base given by BINFO in the class indicated by RLI. |
58731fd1 | 3598 | *BASE_ALIGN is a running maximum of the alignments of |
17bbb839 MM |
3599 | any base class. OFFSETS gives the location of empty base |
3600 | subobjects. T is the most derived type. Return nonzero if the new | |
3601 | object cannot be nearly-empty. A new FIELD_DECL is inserted at | |
c8094d83 | 3602 | *NEXT_FIELD, unless BINFO is for an empty base class. |
5c24fba6 | 3603 | |
17bbb839 MM |
3604 | Returns the location at which the next field should be inserted. */ |
3605 | ||
3606 | static tree * | |
58731fd1 | 3607 | build_base_field (record_layout_info rli, tree binfo, |
17bbb839 | 3608 | splay_tree offsets, tree *next_field) |
d77249e7 | 3609 | { |
17bbb839 | 3610 | tree t = rli->t; |
d77249e7 | 3611 | tree basetype = BINFO_TYPE (binfo); |
d77249e7 | 3612 | |
d0f062fb | 3613 | if (!COMPLETE_TYPE_P (basetype)) |
d77249e7 MM |
3614 | /* This error is now reported in xref_tag, thus giving better |
3615 | location information. */ | |
17bbb839 | 3616 | return next_field; |
c8094d83 | 3617 | |
17bbb839 MM |
3618 | /* Place the base class. */ |
3619 | if (!is_empty_class (basetype)) | |
5c24fba6 | 3620 | { |
17bbb839 MM |
3621 | tree decl; |
3622 | ||
5c24fba6 MM |
3623 | /* The containing class is non-empty because it has a non-empty |
3624 | base class. */ | |
58731fd1 | 3625 | CLASSTYPE_EMPTY_P (t) = 0; |
c8094d83 | 3626 | |
17bbb839 MM |
3627 | /* Create the FIELD_DECL. */ |
3628 | decl = build_decl (FIELD_DECL, NULL_TREE, CLASSTYPE_AS_BASE (basetype)); | |
3629 | DECL_ARTIFICIAL (decl) = 1; | |
78e0d62b | 3630 | DECL_IGNORED_P (decl) = 1; |
17bbb839 | 3631 | DECL_FIELD_CONTEXT (decl) = t; |
1ad8aeeb DG |
3632 | if (CLASSTYPE_AS_BASE (basetype)) |
3633 | { | |
3634 | DECL_SIZE (decl) = CLASSTYPE_SIZE (basetype); | |
3635 | DECL_SIZE_UNIT (decl) = CLASSTYPE_SIZE_UNIT (basetype); | |
3636 | DECL_ALIGN (decl) = CLASSTYPE_ALIGN (basetype); | |
3637 | DECL_USER_ALIGN (decl) = CLASSTYPE_USER_ALIGN (basetype); | |
3638 | DECL_MODE (decl) = TYPE_MODE (basetype); | |
3639 | DECL_FIELD_IS_BASE (decl) = 1; | |
3640 | ||
3641 | /* Try to place the field. It may take more than one try if we | |
3642 | have a hard time placing the field without putting two | |
3643 | objects of the same type at the same address. */ | |
3644 | layout_nonempty_base_or_field (rli, decl, binfo, offsets); | |
3645 | /* Add the new FIELD_DECL to the list of fields for T. */ | |
3646 | TREE_CHAIN (decl) = *next_field; | |
3647 | *next_field = decl; | |
3648 | next_field = &TREE_CHAIN (decl); | |
3649 | } | |
5c24fba6 MM |
3650 | } |
3651 | else | |
ec386958 | 3652 | { |
17bbb839 | 3653 | tree eoc; |
7ba539c6 | 3654 | bool atend; |
ec386958 MM |
3655 | |
3656 | /* On some platforms (ARM), even empty classes will not be | |
3657 | byte-aligned. */ | |
17bbb839 MM |
3658 | eoc = round_up (rli_size_unit_so_far (rli), |
3659 | CLASSTYPE_ALIGN_UNIT (basetype)); | |
d9d9dbc0 | 3660 | atend = layout_empty_base (rli, binfo, eoc, offsets); |
7ba539c6 MM |
3661 | /* A nearly-empty class "has no proper base class that is empty, |
3662 | not morally virtual, and at an offset other than zero." */ | |
809e3e7f | 3663 | if (!BINFO_VIRTUAL_P (binfo) && CLASSTYPE_NEARLY_EMPTY_P (t)) |
7ba539c6 MM |
3664 | { |
3665 | if (atend) | |
3666 | CLASSTYPE_NEARLY_EMPTY_P (t) = 0; | |
c5a35c3c | 3667 | /* The check above (used in G++ 3.2) is insufficient because |
7ba539c6 | 3668 | an empty class placed at offset zero might itself have an |
90024bdc | 3669 | empty base at a nonzero offset. */ |
c8094d83 | 3670 | else if (walk_subobject_offsets (basetype, |
7ba539c6 MM |
3671 | empty_base_at_nonzero_offset_p, |
3672 | size_zero_node, | |
3673 | /*offsets=*/NULL, | |
3674 | /*max_offset=*/NULL_TREE, | |
3675 | /*vbases_p=*/true)) | |
3676 | { | |
3677 | if (abi_version_at_least (2)) | |
3678 | CLASSTYPE_NEARLY_EMPTY_P (t) = 0; | |
74fa0285 GDR |
3679 | else |
3680 | warning (OPT_Wabi, | |
3db45ab5 | 3681 | "class %qT will be considered nearly empty in a " |
7ba539c6 MM |
3682 | "future version of GCC", t); |
3683 | } | |
3684 | } | |
c8094d83 | 3685 | |
17bbb839 MM |
3686 | /* We do not create a FIELD_DECL for empty base classes because |
3687 | it might overlap some other field. We want to be able to | |
3688 | create CONSTRUCTORs for the class by iterating over the | |
3689 | FIELD_DECLs, and the back end does not handle overlapping | |
3690 | FIELD_DECLs. */ | |
58731fd1 MM |
3691 | |
3692 | /* An empty virtual base causes a class to be non-empty | |
3693 | -- but in that case we do not need to clear CLASSTYPE_EMPTY_P | |
3694 | here because that was already done when the virtual table | |
3695 | pointer was created. */ | |
ec386958 | 3696 | } |
5c24fba6 | 3697 | |
5c24fba6 | 3698 | /* Record the offsets of BINFO and its base subobjects. */ |
ff944b49 | 3699 | record_subobject_offsets (binfo, |
c20118a8 | 3700 | BINFO_OFFSET (binfo), |
c8094d83 | 3701 | offsets, |
c5a35c3c | 3702 | /*is_data_member=*/false); |
17bbb839 MM |
3703 | |
3704 | return next_field; | |
d77249e7 MM |
3705 | } |
3706 | ||
c20118a8 | 3707 | /* Layout all of the non-virtual base classes. Record empty |
17bbb839 MM |
3708 | subobjects in OFFSETS. T is the most derived type. Return nonzero |
3709 | if the type cannot be nearly empty. The fields created | |
3710 | corresponding to the base classes will be inserted at | |
3711 | *NEXT_FIELD. */ | |
607cf131 | 3712 | |
17bbb839 | 3713 | static void |
58731fd1 | 3714 | build_base_fields (record_layout_info rli, |
17bbb839 | 3715 | splay_tree offsets, tree *next_field) |
607cf131 MM |
3716 | { |
3717 | /* Chain to hold all the new FIELD_DECLs which stand in for base class | |
3718 | subobjects. */ | |
17bbb839 | 3719 | tree t = rli->t; |
604a3205 | 3720 | int n_baseclasses = BINFO_N_BASE_BINFOS (TYPE_BINFO (t)); |
5c24fba6 | 3721 | int i; |
607cf131 | 3722 | |
3461fba7 | 3723 | /* The primary base class is always allocated first. */ |
17bbb839 MM |
3724 | if (CLASSTYPE_HAS_PRIMARY_BASE_P (t)) |
3725 | next_field = build_base_field (rli, CLASSTYPE_PRIMARY_BINFO (t), | |
58731fd1 | 3726 | offsets, next_field); |
d77249e7 MM |
3727 | |
3728 | /* Now allocate the rest of the bases. */ | |
607cf131 MM |
3729 | for (i = 0; i < n_baseclasses; ++i) |
3730 | { | |
d77249e7 | 3731 | tree base_binfo; |
607cf131 | 3732 | |
604a3205 | 3733 | base_binfo = BINFO_BASE_BINFO (TYPE_BINFO (t), i); |
911a71a7 | 3734 | |
3461fba7 NS |
3735 | /* The primary base was already allocated above, so we don't |
3736 | need to allocate it again here. */ | |
17bbb839 | 3737 | if (base_binfo == CLASSTYPE_PRIMARY_BINFO (t)) |
607cf131 MM |
3738 | continue; |
3739 | ||
dbbf88d1 NS |
3740 | /* Virtual bases are added at the end (a primary virtual base |
3741 | will have already been added). */ | |
809e3e7f | 3742 | if (BINFO_VIRTUAL_P (base_binfo)) |
607cf131 MM |
3743 | continue; |
3744 | ||
58731fd1 | 3745 | next_field = build_base_field (rli, base_binfo, |
17bbb839 | 3746 | offsets, next_field); |
607cf131 | 3747 | } |
607cf131 MM |
3748 | } |
3749 | ||
58010b57 MM |
3750 | /* Go through the TYPE_METHODS of T issuing any appropriate |
3751 | diagnostics, figuring out which methods override which other | |
3ef397c1 | 3752 | methods, and so forth. */ |
58010b57 MM |
3753 | |
3754 | static void | |
94edc4ab | 3755 | check_methods (tree t) |
58010b57 MM |
3756 | { |
3757 | tree x; | |
58010b57 MM |
3758 | |
3759 | for (x = TYPE_METHODS (t); x; x = TREE_CHAIN (x)) | |
3760 | { | |
58010b57 | 3761 | check_for_override (x, t); |
fee7654e | 3762 | if (DECL_PURE_VIRTUAL_P (x) && ! DECL_VINDEX (x)) |
dee15844 | 3763 | error ("initializer specified for non-virtual method %q+D", x); |
58010b57 MM |
3764 | /* The name of the field is the original field name |
3765 | Save this in auxiliary field for later overloading. */ | |
3766 | if (DECL_VINDEX (x)) | |
3767 | { | |
3ef397c1 | 3768 | TYPE_POLYMORPHIC_P (t) = 1; |
fee7654e | 3769 | if (DECL_PURE_VIRTUAL_P (x)) |
d4e6fecb | 3770 | VEC_safe_push (tree, gc, CLASSTYPE_PURE_VIRTUALS (t), x); |
58010b57 | 3771 | } |
b87d79e6 JM |
3772 | /* All user-provided destructors are non-trivial. */ |
3773 | if (DECL_DESTRUCTOR_P (x) && !DECL_DEFAULTED_FN (x)) | |
9f4faeae | 3774 | TYPE_HAS_NONTRIVIAL_DESTRUCTOR (t) = 1; |
58010b57 | 3775 | } |
58010b57 MM |
3776 | } |
3777 | ||
db9b2174 MM |
3778 | /* FN is a constructor or destructor. Clone the declaration to create |
3779 | a specialized in-charge or not-in-charge version, as indicated by | |
3780 | NAME. */ | |
3781 | ||
3782 | static tree | |
94edc4ab | 3783 | build_clone (tree fn, tree name) |
db9b2174 MM |
3784 | { |
3785 | tree parms; | |
3786 | tree clone; | |
3787 | ||
3788 | /* Copy the function. */ | |
3789 | clone = copy_decl (fn); | |
3790 | /* Remember where this function came from. */ | |
3791 | DECL_CLONED_FUNCTION (clone) = fn; | |
5daf7c0a | 3792 | DECL_ABSTRACT_ORIGIN (clone) = fn; |
db9b2174 MM |
3793 | /* Reset the function name. */ |
3794 | DECL_NAME (clone) = name; | |
71cb9286 | 3795 | SET_DECL_ASSEMBLER_NAME (clone, NULL_TREE); |
db9b2174 MM |
3796 | /* There's no pending inline data for this function. */ |
3797 | DECL_PENDING_INLINE_INFO (clone) = NULL; | |
3798 | DECL_PENDING_INLINE_P (clone) = 0; | |
3799 | /* And it hasn't yet been deferred. */ | |
3800 | DECL_DEFERRED_FN (clone) = 0; | |
3801 | ||
298d6f60 MM |
3802 | /* The base-class destructor is not virtual. */ |
3803 | if (name == base_dtor_identifier) | |
3804 | { | |
3805 | DECL_VIRTUAL_P (clone) = 0; | |
3806 | if (TREE_CODE (clone) != TEMPLATE_DECL) | |
3807 | DECL_VINDEX (clone) = NULL_TREE; | |
3808 | } | |
3809 | ||
4e7512c9 | 3810 | /* If there was an in-charge parameter, drop it from the function |
db9b2174 MM |
3811 | type. */ |
3812 | if (DECL_HAS_IN_CHARGE_PARM_P (clone)) | |
3813 | { | |
3814 | tree basetype; | |
3815 | tree parmtypes; | |
3816 | tree exceptions; | |
3817 | ||
3818 | exceptions = TYPE_RAISES_EXCEPTIONS (TREE_TYPE (clone)); | |
3819 | basetype = TYPE_METHOD_BASETYPE (TREE_TYPE (clone)); | |
3820 | parmtypes = TYPE_ARG_TYPES (TREE_TYPE (clone)); | |
3821 | /* Skip the `this' parameter. */ | |
3822 | parmtypes = TREE_CHAIN (parmtypes); | |
3823 | /* Skip the in-charge parameter. */ | |
3824 | parmtypes = TREE_CHAIN (parmtypes); | |
e0fff4b3 JM |
3825 | /* And the VTT parm, in a complete [cd]tor. */ |
3826 | if (DECL_HAS_VTT_PARM_P (fn) | |
3827 | && ! DECL_NEEDS_VTT_PARM_P (clone)) | |
3828 | parmtypes = TREE_CHAIN (parmtypes); | |
3ec6bad3 MM |
3829 | /* If this is subobject constructor or destructor, add the vtt |
3830 | parameter. */ | |
c8094d83 | 3831 | TREE_TYPE (clone) |
43dc123f MM |
3832 | = build_method_type_directly (basetype, |
3833 | TREE_TYPE (TREE_TYPE (clone)), | |
3834 | parmtypes); | |
db9b2174 MM |
3835 | if (exceptions) |
3836 | TREE_TYPE (clone) = build_exception_variant (TREE_TYPE (clone), | |
3837 | exceptions); | |
c8094d83 | 3838 | TREE_TYPE (clone) |
e9525111 MM |
3839 | = cp_build_type_attribute_variant (TREE_TYPE (clone), |
3840 | TYPE_ATTRIBUTES (TREE_TYPE (fn))); | |
db9b2174 MM |
3841 | } |
3842 | ||
e0fff4b3 JM |
3843 | /* Copy the function parameters. But, DECL_ARGUMENTS on a TEMPLATE_DECL |
3844 | aren't function parameters; those are the template parameters. */ | |
db9b2174 MM |
3845 | if (TREE_CODE (clone) != TEMPLATE_DECL) |
3846 | { | |
3847 | DECL_ARGUMENTS (clone) = copy_list (DECL_ARGUMENTS (clone)); | |
3848 | /* Remove the in-charge parameter. */ | |
3849 | if (DECL_HAS_IN_CHARGE_PARM_P (clone)) | |
3850 | { | |
3851 | TREE_CHAIN (DECL_ARGUMENTS (clone)) | |
3852 | = TREE_CHAIN (TREE_CHAIN (DECL_ARGUMENTS (clone))); | |
3853 | DECL_HAS_IN_CHARGE_PARM_P (clone) = 0; | |
3854 | } | |
e0fff4b3 JM |
3855 | /* And the VTT parm, in a complete [cd]tor. */ |
3856 | if (DECL_HAS_VTT_PARM_P (fn)) | |
3ec6bad3 | 3857 | { |
e0fff4b3 JM |
3858 | if (DECL_NEEDS_VTT_PARM_P (clone)) |
3859 | DECL_HAS_VTT_PARM_P (clone) = 1; | |
3860 | else | |
3861 | { | |
3862 | TREE_CHAIN (DECL_ARGUMENTS (clone)) | |
3863 | = TREE_CHAIN (TREE_CHAIN (DECL_ARGUMENTS (clone))); | |
3864 | DECL_HAS_VTT_PARM_P (clone) = 0; | |
3865 | } | |
3ec6bad3 MM |
3866 | } |
3867 | ||
db9b2174 MM |
3868 | for (parms = DECL_ARGUMENTS (clone); parms; parms = TREE_CHAIN (parms)) |
3869 | { | |
3870 | DECL_CONTEXT (parms) = clone; | |
63e1b1c4 | 3871 | cxx_dup_lang_specific_decl (parms); |
db9b2174 MM |
3872 | } |
3873 | } | |
3874 | ||
db9b2174 | 3875 | /* Create the RTL for this function. */ |
19e7881c | 3876 | SET_DECL_RTL (clone, NULL_RTX); |
0e6df31e | 3877 | rest_of_decl_compilation (clone, /*top_level=*/1, at_eof); |
c8094d83 | 3878 | |
db9b2174 MM |
3879 | /* Make it easy to find the CLONE given the FN. */ |
3880 | TREE_CHAIN (clone) = TREE_CHAIN (fn); | |
3881 | TREE_CHAIN (fn) = clone; | |
3882 | ||
3883 | /* If this is a template, handle the DECL_TEMPLATE_RESULT as well. */ | |
3884 | if (TREE_CODE (clone) == TEMPLATE_DECL) | |
3885 | { | |
3886 | tree result; | |
3887 | ||
c8094d83 | 3888 | DECL_TEMPLATE_RESULT (clone) |
db9b2174 MM |
3889 | = build_clone (DECL_TEMPLATE_RESULT (clone), name); |
3890 | result = DECL_TEMPLATE_RESULT (clone); | |
3891 | DECL_TEMPLATE_INFO (result) = copy_node (DECL_TEMPLATE_INFO (result)); | |
3892 | DECL_TI_TEMPLATE (result) = clone; | |
3893 | } | |
5e2f4cd2 MM |
3894 | else if (pch_file) |
3895 | note_decl_for_pch (clone); | |
db9b2174 MM |
3896 | |
3897 | return clone; | |
3898 | } | |
3899 | ||
3900 | /* Produce declarations for all appropriate clones of FN. If | |
838dfd8a | 3901 | UPDATE_METHOD_VEC_P is nonzero, the clones are added to the |
db9b2174 MM |
3902 | CLASTYPE_METHOD_VEC as well. */ |
3903 | ||
3904 | void | |
94edc4ab | 3905 | clone_function_decl (tree fn, int update_method_vec_p) |
db9b2174 MM |
3906 | { |
3907 | tree clone; | |
3908 | ||
c00996a3 | 3909 | /* Avoid inappropriate cloning. */ |
1f84ec23 MM |
3910 | if (TREE_CHAIN (fn) |
3911 | && DECL_CLONED_FUNCTION (TREE_CHAIN (fn))) | |
c00996a3 JM |
3912 | return; |
3913 | ||
298d6f60 | 3914 | if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (fn)) |
db9b2174 | 3915 | { |
298d6f60 MM |
3916 | /* For each constructor, we need two variants: an in-charge version |
3917 | and a not-in-charge version. */ | |
db9b2174 MM |
3918 | clone = build_clone (fn, complete_ctor_identifier); |
3919 | if (update_method_vec_p) | |
b2a9b208 | 3920 | add_method (DECL_CONTEXT (clone), clone, NULL_TREE); |
db9b2174 MM |
3921 | clone = build_clone (fn, base_ctor_identifier); |
3922 | if (update_method_vec_p) | |
b2a9b208 | 3923 | add_method (DECL_CONTEXT (clone), clone, NULL_TREE); |
db9b2174 MM |
3924 | } |
3925 | else | |
298d6f60 | 3926 | { |
50bc768d | 3927 | gcc_assert (DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P (fn)); |
298d6f60 | 3928 | |
3ec6bad3 | 3929 | /* For each destructor, we need three variants: an in-charge |
298d6f60 | 3930 | version, a not-in-charge version, and an in-charge deleting |
4e7512c9 MM |
3931 | version. We clone the deleting version first because that |
3932 | means it will go second on the TYPE_METHODS list -- and that | |
3933 | corresponds to the correct layout order in the virtual | |
c8094d83 | 3934 | function table. |
52682a1b | 3935 | |
0cbd7506 | 3936 | For a non-virtual destructor, we do not build a deleting |
52682a1b MM |
3937 | destructor. */ |
3938 | if (DECL_VIRTUAL_P (fn)) | |
3939 | { | |
3940 | clone = build_clone (fn, deleting_dtor_identifier); | |
3941 | if (update_method_vec_p) | |
b2a9b208 | 3942 | add_method (DECL_CONTEXT (clone), clone, NULL_TREE); |
52682a1b | 3943 | } |
4e7512c9 | 3944 | clone = build_clone (fn, complete_dtor_identifier); |
298d6f60 | 3945 | if (update_method_vec_p) |
b2a9b208 | 3946 | add_method (DECL_CONTEXT (clone), clone, NULL_TREE); |
298d6f60 MM |
3947 | clone = build_clone (fn, base_dtor_identifier); |
3948 | if (update_method_vec_p) | |
b2a9b208 | 3949 | add_method (DECL_CONTEXT (clone), clone, NULL_TREE); |
298d6f60 | 3950 | } |
5daf7c0a JM |
3951 | |
3952 | /* Note that this is an abstract function that is never emitted. */ | |
3953 | DECL_ABSTRACT (fn) = 1; | |
db9b2174 MM |
3954 | } |
3955 | ||
5f6eeeb3 NS |
3956 | /* DECL is an in charge constructor, which is being defined. This will |
3957 | have had an in class declaration, from whence clones were | |
3958 | declared. An out-of-class definition can specify additional default | |
3959 | arguments. As it is the clones that are involved in overload | |
3960 | resolution, we must propagate the information from the DECL to its | |
00a17e31 | 3961 | clones. */ |
5f6eeeb3 NS |
3962 | |
3963 | void | |
94edc4ab | 3964 | adjust_clone_args (tree decl) |
5f6eeeb3 NS |
3965 | { |
3966 | tree clone; | |
c8094d83 | 3967 | |
5f6eeeb3 NS |
3968 | for (clone = TREE_CHAIN (decl); clone && DECL_CLONED_FUNCTION (clone); |
3969 | clone = TREE_CHAIN (clone)) | |
3970 | { | |
3971 | tree orig_clone_parms = TYPE_ARG_TYPES (TREE_TYPE (clone)); | |
3972 | tree orig_decl_parms = TYPE_ARG_TYPES (TREE_TYPE (decl)); | |
3973 | tree decl_parms, clone_parms; | |
3974 | ||
3975 | clone_parms = orig_clone_parms; | |
c8094d83 | 3976 | |
00a17e31 | 3977 | /* Skip the 'this' parameter. */ |
5f6eeeb3 NS |
3978 | orig_clone_parms = TREE_CHAIN (orig_clone_parms); |
3979 | orig_decl_parms = TREE_CHAIN (orig_decl_parms); | |
3980 | ||
3981 | if (DECL_HAS_IN_CHARGE_PARM_P (decl)) | |
3982 | orig_decl_parms = TREE_CHAIN (orig_decl_parms); | |
3983 | if (DECL_HAS_VTT_PARM_P (decl)) | |
3984 | orig_decl_parms = TREE_CHAIN (orig_decl_parms); | |
c8094d83 | 3985 | |
5f6eeeb3 NS |
3986 | clone_parms = orig_clone_parms; |
3987 | if (DECL_HAS_VTT_PARM_P (clone)) | |
3988 | clone_parms = TREE_CHAIN (clone_parms); | |
c8094d83 | 3989 | |
5f6eeeb3 NS |
3990 | for (decl_parms = orig_decl_parms; decl_parms; |
3991 | decl_parms = TREE_CHAIN (decl_parms), | |
3992 | clone_parms = TREE_CHAIN (clone_parms)) | |
3993 | { | |
50bc768d NS |
3994 | gcc_assert (same_type_p (TREE_TYPE (decl_parms), |
3995 | TREE_TYPE (clone_parms))); | |
c8094d83 | 3996 | |
5f6eeeb3 NS |
3997 | if (TREE_PURPOSE (decl_parms) && !TREE_PURPOSE (clone_parms)) |
3998 | { | |
3999 | /* A default parameter has been added. Adjust the | |
00a17e31 | 4000 | clone's parameters. */ |
5f6eeeb3 NS |
4001 | tree exceptions = TYPE_RAISES_EXCEPTIONS (TREE_TYPE (clone)); |
4002 | tree basetype = TYPE_METHOD_BASETYPE (TREE_TYPE (clone)); | |
4003 | tree type; | |
4004 | ||
4005 | clone_parms = orig_decl_parms; | |
4006 | ||
4007 | if (DECL_HAS_VTT_PARM_P (clone)) | |
4008 | { | |
4009 | clone_parms = tree_cons (TREE_PURPOSE (orig_clone_parms), | |
4010 | TREE_VALUE (orig_clone_parms), | |
4011 | clone_parms); | |
4012 | TREE_TYPE (clone_parms) = TREE_TYPE (orig_clone_parms); | |
4013 | } | |
43dc123f MM |
4014 | type = build_method_type_directly (basetype, |
4015 | TREE_TYPE (TREE_TYPE (clone)), | |
4016 | clone_parms); | |
5f6eeeb3 NS |
4017 | if (exceptions) |
4018 | type = build_exception_variant (type, exceptions); | |
4019 | TREE_TYPE (clone) = type; | |
c8094d83 | 4020 | |
5f6eeeb3 NS |
4021 | clone_parms = NULL_TREE; |
4022 | break; | |
4023 | } | |
4024 | } | |
50bc768d | 4025 | gcc_assert (!clone_parms); |
5f6eeeb3 NS |
4026 | } |
4027 | } | |
4028 | ||
db9b2174 MM |
4029 | /* For each of the constructors and destructors in T, create an |
4030 | in-charge and not-in-charge variant. */ | |
4031 | ||
4032 | static void | |
94edc4ab | 4033 | clone_constructors_and_destructors (tree t) |
db9b2174 MM |
4034 | { |
4035 | tree fns; | |
4036 | ||
db9b2174 MM |
4037 | /* If for some reason we don't have a CLASSTYPE_METHOD_VEC, we bail |
4038 | out now. */ | |
4039 | if (!CLASSTYPE_METHOD_VEC (t)) | |
4040 | return; | |
4041 | ||
db9b2174 MM |
4042 | for (fns = CLASSTYPE_CONSTRUCTORS (t); fns; fns = OVL_NEXT (fns)) |
4043 | clone_function_decl (OVL_CURRENT (fns), /*update_method_vec_p=*/1); | |
298d6f60 MM |
4044 | for (fns = CLASSTYPE_DESTRUCTORS (t); fns; fns = OVL_NEXT (fns)) |
4045 | clone_function_decl (OVL_CURRENT (fns), /*update_method_vec_p=*/1); | |
db9b2174 MM |
4046 | } |
4047 | ||
8c95264b MLI |
4048 | /* Returns true iff class T has a user-defined constructor other than |
4049 | the default constructor. */ | |
4050 | ||
4051 | bool | |
4052 | type_has_user_nondefault_constructor (tree t) | |
4053 | { | |
4054 | tree fns; | |
4055 | ||
4056 | if (!TYPE_HAS_USER_CONSTRUCTOR (t)) | |
4057 | return false; | |
4058 | ||
4059 | for (fns = CLASSTYPE_CONSTRUCTORS (t); fns; fns = OVL_NEXT (fns)) | |
4060 | { | |
4061 | tree fn = OVL_CURRENT (fns); | |
4062 | if (!DECL_ARTIFICIAL (fn) | |
c2b58ba2 JM |
4063 | && (TREE_CODE (fn) == TEMPLATE_DECL |
4064 | || (skip_artificial_parms_for (fn, DECL_ARGUMENTS (fn)) | |
4065 | != NULL_TREE))) | |
8c95264b MLI |
4066 | return true; |
4067 | } | |
4068 | ||
4069 | return false; | |
4070 | } | |
4071 | ||
b87d79e6 JM |
4072 | /* Returns true iff FN is a user-provided function, i.e. user-declared |
4073 | and not defaulted at its first declaration. */ | |
4074 | ||
4075 | static bool | |
4076 | user_provided_p (tree fn) | |
4077 | { | |
4078 | if (TREE_CODE (fn) == TEMPLATE_DECL) | |
4079 | return true; | |
4080 | else | |
4081 | return (!DECL_ARTIFICIAL (fn) | |
4082 | && !(DECL_DEFAULTED_FN (fn) | |
4083 | && DECL_INITIALIZED_IN_CLASS_P (fn))); | |
4084 | } | |
4085 | ||
4086 | /* Returns true iff class T has a user-provided constructor. */ | |
4087 | ||
4088 | bool | |
4089 | type_has_user_provided_constructor (tree t) | |
4090 | { | |
4091 | tree fns; | |
4092 | ||
fd97a96a JM |
4093 | if (!CLASS_TYPE_P (t)) |
4094 | return false; | |
4095 | ||
b87d79e6 JM |
4096 | if (!TYPE_HAS_USER_CONSTRUCTOR (t)) |
4097 | return false; | |
4098 | ||
4099 | /* This can happen in error cases; avoid crashing. */ | |
4100 | if (!CLASSTYPE_METHOD_VEC (t)) | |
4101 | return false; | |
4102 | ||
4103 | for (fns = CLASSTYPE_CONSTRUCTORS (t); fns; fns = OVL_NEXT (fns)) | |
4104 | if (user_provided_p (OVL_CURRENT (fns))) | |
4105 | return true; | |
4106 | ||
4107 | return false; | |
4108 | } | |
4109 | ||
4110 | /* Returns true iff class T has a user-provided default constructor. */ | |
4111 | ||
4112 | bool | |
4113 | type_has_user_provided_default_constructor (tree t) | |
4114 | { | |
ff60c668 | 4115 | tree fns, args; |
b87d79e6 JM |
4116 | |
4117 | if (!TYPE_HAS_USER_CONSTRUCTOR (t)) | |
4118 | return false; | |
4119 | ||
4120 | for (fns = CLASSTYPE_CONSTRUCTORS (t); fns; fns = OVL_NEXT (fns)) | |
4121 | { | |
4122 | tree fn = OVL_CURRENT (fns); | |
7ad8d488 | 4123 | if (TREE_CODE (fn) == FUNCTION_DECL |
ff60c668 L |
4124 | && user_provided_p (fn)) |
4125 | { | |
4126 | args = FUNCTION_FIRST_USER_PARMTYPE (fn); | |
4127 | while (args && TREE_PURPOSE (args)) | |
4128 | args = TREE_CHAIN (args); | |
4129 | if (!args || args == void_list_node) | |
4130 | return true; | |
4131 | } | |
b87d79e6 JM |
4132 | } |
4133 | ||
4134 | return false; | |
4135 | } | |
4136 | ||
4137 | /* Returns true if FN can be explicitly defaulted. */ | |
4138 | ||
4139 | bool | |
4140 | defaultable_fn_p (tree fn) | |
4141 | { | |
4142 | if (DECL_CONSTRUCTOR_P (fn)) | |
4143 | { | |
bfbe1b68 | 4144 | if (FUNCTION_FIRST_USER_PARMTYPE (fn) == void_list_node) |
b87d79e6 | 4145 | return true; |
bfbe1b68 JM |
4146 | else if (copy_fn_p (fn) > 0 |
4147 | && (TREE_CHAIN (FUNCTION_FIRST_USER_PARMTYPE (fn)) | |
4148 | == void_list_node)) | |
b87d79e6 JM |
4149 | return true; |
4150 | else | |
4151 | return false; | |
4152 | } | |
4153 | else if (DECL_DESTRUCTOR_P (fn)) | |
4154 | return true; | |
8adee3e6 JM |
4155 | else if (DECL_ASSIGNMENT_OPERATOR_P (fn) |
4156 | && DECL_OVERLOADED_OPERATOR_P (fn) == NOP_EXPR) | |
b87d79e6 JM |
4157 | return copy_fn_p (fn); |
4158 | else | |
4159 | return false; | |
4160 | } | |
4161 | ||
58010b57 MM |
4162 | /* Remove all zero-width bit-fields from T. */ |
4163 | ||
4164 | static void | |
94edc4ab | 4165 | remove_zero_width_bit_fields (tree t) |
58010b57 MM |
4166 | { |
4167 | tree *fieldsp; | |
4168 | ||
c8094d83 | 4169 | fieldsp = &TYPE_FIELDS (t); |
58010b57 MM |
4170 | while (*fieldsp) |
4171 | { | |
4172 | if (TREE_CODE (*fieldsp) == FIELD_DECL | |
c8094d83 | 4173 | && DECL_C_BIT_FIELD (*fieldsp) |
58010b57 MM |
4174 | && DECL_INITIAL (*fieldsp)) |
4175 | *fieldsp = TREE_CHAIN (*fieldsp); | |
4176 | else | |
4177 | fieldsp = &TREE_CHAIN (*fieldsp); | |
4178 | } | |
4179 | } | |
4180 | ||
dbc957f1 MM |
4181 | /* Returns TRUE iff we need a cookie when dynamically allocating an |
4182 | array whose elements have the indicated class TYPE. */ | |
4183 | ||
4184 | static bool | |
94edc4ab | 4185 | type_requires_array_cookie (tree type) |
dbc957f1 MM |
4186 | { |
4187 | tree fns; | |
18fee3ee | 4188 | bool has_two_argument_delete_p = false; |
dbc957f1 | 4189 | |
50bc768d | 4190 | gcc_assert (CLASS_TYPE_P (type)); |
dbc957f1 MM |
4191 | |
4192 | /* If there's a non-trivial destructor, we need a cookie. In order | |
4193 | to iterate through the array calling the destructor for each | |
4194 | element, we'll have to know how many elements there are. */ | |
4195 | if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type)) | |
4196 | return true; | |
4197 | ||
4198 | /* If the usual deallocation function is a two-argument whose second | |
4199 | argument is of type `size_t', then we have to pass the size of | |
4200 | the array to the deallocation function, so we will need to store | |
4201 | a cookie. */ | |
c8094d83 | 4202 | fns = lookup_fnfields (TYPE_BINFO (type), |
dbc957f1 MM |
4203 | ansi_opname (VEC_DELETE_EXPR), |
4204 | /*protect=*/0); | |
4205 | /* If there are no `operator []' members, or the lookup is | |
4206 | ambiguous, then we don't need a cookie. */ | |
4207 | if (!fns || fns == error_mark_node) | |
4208 | return false; | |
4209 | /* Loop through all of the functions. */ | |
50ad9642 | 4210 | for (fns = BASELINK_FUNCTIONS (fns); fns; fns = OVL_NEXT (fns)) |
dbc957f1 MM |
4211 | { |
4212 | tree fn; | |
4213 | tree second_parm; | |
4214 | ||
4215 | /* Select the current function. */ | |
4216 | fn = OVL_CURRENT (fns); | |
4217 | /* See if this function is a one-argument delete function. If | |
4218 | it is, then it will be the usual deallocation function. */ | |
4219 | second_parm = TREE_CHAIN (TYPE_ARG_TYPES (TREE_TYPE (fn))); | |
4220 | if (second_parm == void_list_node) | |
4221 | return false; | |
4b8cb94c SM |
4222 | /* Do not consider this function if its second argument is an |
4223 | ellipsis. */ | |
4224 | if (!second_parm) | |
4225 | continue; | |
dbc957f1 MM |
4226 | /* Otherwise, if we have a two-argument function and the second |
4227 | argument is `size_t', it will be the usual deallocation | |
4228 | function -- unless there is one-argument function, too. */ | |
4229 | if (TREE_CHAIN (second_parm) == void_list_node | |
c79154c4 | 4230 | && same_type_p (TREE_VALUE (second_parm), size_type_node)) |
dbc957f1 MM |
4231 | has_two_argument_delete_p = true; |
4232 | } | |
4233 | ||
4234 | return has_two_argument_delete_p; | |
4235 | } | |
4236 | ||
607cf131 MM |
4237 | /* Check the validity of the bases and members declared in T. Add any |
4238 | implicitly-generated functions (like copy-constructors and | |
4239 | assignment operators). Compute various flag bits (like | |
4240 | CLASSTYPE_NON_POD_T) for T. This routine works purely at the C++ | |
4241 | level: i.e., independently of the ABI in use. */ | |
4242 | ||
4243 | static void | |
58731fd1 | 4244 | check_bases_and_members (tree t) |
607cf131 | 4245 | { |
607cf131 MM |
4246 | /* Nonzero if the implicitly generated copy constructor should take |
4247 | a non-const reference argument. */ | |
4248 | int cant_have_const_ctor; | |
78dcd41a | 4249 | /* Nonzero if the implicitly generated assignment operator |
607cf131 MM |
4250 | should take a non-const reference argument. */ |
4251 | int no_const_asn_ref; | |
4252 | tree access_decls; | |
b87d79e6 JM |
4253 | bool saved_complex_asn_ref; |
4254 | bool saved_nontrivial_dtor; | |
607cf131 MM |
4255 | |
4256 | /* By default, we use const reference arguments and generate default | |
4257 | constructors. */ | |
607cf131 MM |
4258 | cant_have_const_ctor = 0; |
4259 | no_const_asn_ref = 0; | |
4260 | ||
00a17e31 | 4261 | /* Check all the base-classes. */ |
e5e459bf | 4262 | check_bases (t, &cant_have_const_ctor, |
607cf131 MM |
4263 | &no_const_asn_ref); |
4264 | ||
9f4faeae MM |
4265 | /* Check all the method declarations. */ |
4266 | check_methods (t); | |
4267 | ||
b87d79e6 JM |
4268 | /* Save the initial values of these flags which only indicate whether |
4269 | or not the class has user-provided functions. As we analyze the | |
4270 | bases and members we can set these flags for other reasons. */ | |
4271 | saved_complex_asn_ref = TYPE_HAS_COMPLEX_ASSIGN_REF (t); | |
4272 | saved_nontrivial_dtor = TYPE_HAS_NONTRIVIAL_DESTRUCTOR (t); | |
4273 | ||
9f4faeae MM |
4274 | /* Check all the data member declarations. We cannot call |
4275 | check_field_decls until we have called check_bases check_methods, | |
4276 | as check_field_decls depends on TYPE_HAS_NONTRIVIAL_DESTRUCTOR | |
4277 | being set appropriately. */ | |
58731fd1 | 4278 | check_field_decls (t, &access_decls, |
607cf131 MM |
4279 | &cant_have_const_ctor, |
4280 | &no_const_asn_ref); | |
4281 | ||
bbd15aac MM |
4282 | /* A nearly-empty class has to be vptr-containing; a nearly empty |
4283 | class contains just a vptr. */ | |
4284 | if (!TYPE_CONTAINS_VPTR_P (t)) | |
f9c528ea MM |
4285 | CLASSTYPE_NEARLY_EMPTY_P (t) = 0; |
4286 | ||
607cf131 MM |
4287 | /* Do some bookkeeping that will guide the generation of implicitly |
4288 | declared member functions. */ | |
b87d79e6 | 4289 | TYPE_HAS_COMPLEX_INIT_REF (t) |= TYPE_CONTAINS_VPTR_P (t); |
0fcedd9c | 4290 | /* We need to call a constructor for this class if it has a |
b87d79e6 | 4291 | user-provided constructor, or if the default constructor is going |
0fcedd9c JM |
4292 | to initialize the vptr. (This is not an if-and-only-if; |
4293 | TYPE_NEEDS_CONSTRUCTING is set elsewhere if bases or members | |
4294 | themselves need constructing.) */ | |
607cf131 | 4295 | TYPE_NEEDS_CONSTRUCTING (t) |
b87d79e6 | 4296 | |= (type_has_user_provided_constructor (t) || TYPE_CONTAINS_VPTR_P (t)); |
0fcedd9c JM |
4297 | /* [dcl.init.aggr] |
4298 | ||
b87d79e6 | 4299 | An aggregate is an array or a class with no user-provided |
0fcedd9c JM |
4300 | constructors ... and no virtual functions. |
4301 | ||
4302 | Again, other conditions for being an aggregate are checked | |
4303 | elsewhere. */ | |
5775a06a | 4304 | CLASSTYPE_NON_AGGREGATE (t) |
b87d79e6 | 4305 | |= (type_has_user_provided_constructor (t) || TYPE_POLYMORPHIC_P (t)); |
607cf131 | 4306 | CLASSTYPE_NON_POD_P (t) |
c8094d83 | 4307 | |= (CLASSTYPE_NON_AGGREGATE (t) |
b87d79e6 JM |
4308 | || saved_nontrivial_dtor || saved_complex_asn_ref); |
4309 | TYPE_HAS_COMPLEX_ASSIGN_REF (t) |= TYPE_CONTAINS_VPTR_P (t); | |
f782c65c | 4310 | TYPE_HAS_COMPLEX_DFLT (t) |= TYPE_CONTAINS_VPTR_P (t); |
607cf131 | 4311 | |
0fcedd9c JM |
4312 | /* If the class has no user-declared constructor, but does have |
4313 | non-static const or reference data members that can never be | |
4314 | initialized, issue a warning. */ | |
c73d5dd9 | 4315 | if (warn_uninitialized |
0fcedd9c JM |
4316 | /* Classes with user-declared constructors are presumed to |
4317 | initialize these members. */ | |
4318 | && !TYPE_HAS_USER_CONSTRUCTOR (t) | |
4319 | /* Aggregates can be initialized with brace-enclosed | |
4320 | initializers. */ | |
4321 | && CLASSTYPE_NON_AGGREGATE (t)) | |
4322 | { | |
4323 | tree field; | |
4324 | ||
4325 | for (field = TYPE_FIELDS (t); field; field = TREE_CHAIN (field)) | |
4326 | { | |
4327 | tree type; | |
4328 | ||
4329 | if (TREE_CODE (field) != FIELD_DECL) | |
4330 | continue; | |
4331 | ||
4332 | type = TREE_TYPE (field); | |
4333 | if (TREE_CODE (type) == REFERENCE_TYPE) | |
c73d5dd9 MLI |
4334 | warning (OPT_Wuninitialized, "non-static reference %q+#D " |
4335 | "in class without a constructor", field); | |
0fcedd9c JM |
4336 | else if (CP_TYPE_CONST_P (type) |
4337 | && (!CLASS_TYPE_P (type) | |
4338 | || !TYPE_HAS_DEFAULT_CONSTRUCTOR (type))) | |
c73d5dd9 MLI |
4339 | warning (OPT_Wuninitialized, "non-static const member %q+#D " |
4340 | "in class without a constructor", field); | |
0fcedd9c JM |
4341 | } |
4342 | } | |
4343 | ||
03fd3f84 | 4344 | /* Synthesize any needed methods. */ |
e5e459bf | 4345 | add_implicitly_declared_members (t, |
607cf131 MM |
4346 | cant_have_const_ctor, |
4347 | no_const_asn_ref); | |
4348 | ||
db9b2174 MM |
4349 | /* Create the in-charge and not-in-charge variants of constructors |
4350 | and destructors. */ | |
4351 | clone_constructors_and_destructors (t); | |
4352 | ||
aa52c1ff JM |
4353 | /* Process the using-declarations. */ |
4354 | for (; access_decls; access_decls = TREE_CHAIN (access_decls)) | |
4355 | handle_using_decl (TREE_VALUE (access_decls), t); | |
4356 | ||
607cf131 MM |
4357 | /* Build and sort the CLASSTYPE_METHOD_VEC. */ |
4358 | finish_struct_methods (t); | |
dbc957f1 MM |
4359 | |
4360 | /* Figure out whether or not we will need a cookie when dynamically | |
4361 | allocating an array of this type. */ | |
e2500fed | 4362 | TYPE_LANG_SPECIFIC (t)->u.c.vec_new_uses_cookie |
dbc957f1 | 4363 | = type_requires_array_cookie (t); |
607cf131 MM |
4364 | } |
4365 | ||
3ef397c1 | 4366 | /* If T needs a pointer to its virtual function table, set TYPE_VFIELD |
5c24fba6 MM |
4367 | accordingly. If a new vfield was created (because T doesn't have a |
4368 | primary base class), then the newly created field is returned. It | |
c35cce41 | 4369 | is not added to the TYPE_FIELDS list; it is the caller's |
e6858a84 NS |
4370 | responsibility to do that. Accumulate declared virtual functions |
4371 | on VIRTUALS_P. */ | |
3ef397c1 | 4372 | |
5c24fba6 | 4373 | static tree |
94edc4ab | 4374 | create_vtable_ptr (tree t, tree* virtuals_p) |
3ef397c1 MM |
4375 | { |
4376 | tree fn; | |
4377 | ||
e6858a84 | 4378 | /* Collect the virtual functions declared in T. */ |
3ef397c1 | 4379 | for (fn = TYPE_METHODS (t); fn; fn = TREE_CHAIN (fn)) |
e6858a84 NS |
4380 | if (DECL_VINDEX (fn) && !DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P (fn) |
4381 | && TREE_CODE (DECL_VINDEX (fn)) != INTEGER_CST) | |
4382 | { | |
4383 | tree new_virtual = make_node (TREE_LIST); | |
c8094d83 | 4384 | |
e6858a84 NS |
4385 | BV_FN (new_virtual) = fn; |
4386 | BV_DELTA (new_virtual) = integer_zero_node; | |
d1f05f93 | 4387 | BV_VCALL_INDEX (new_virtual) = NULL_TREE; |
3ef397c1 | 4388 | |
e6858a84 NS |
4389 | TREE_CHAIN (new_virtual) = *virtuals_p; |
4390 | *virtuals_p = new_virtual; | |
4391 | } | |
c8094d83 | 4392 | |
da3d4dfa MM |
4393 | /* If we couldn't find an appropriate base class, create a new field |
4394 | here. Even if there weren't any new virtual functions, we might need a | |
bbd15aac MM |
4395 | new virtual function table if we're supposed to include vptrs in |
4396 | all classes that need them. */ | |
e6858a84 | 4397 | if (!TYPE_VFIELD (t) && (*virtuals_p || TYPE_CONTAINS_VPTR_P (t))) |
3ef397c1 MM |
4398 | { |
4399 | /* We build this decl with vtbl_ptr_type_node, which is a | |
4400 | `vtable_entry_type*'. It might seem more precise to use | |
a692ad2e | 4401 | `vtable_entry_type (*)[N]' where N is the number of virtual |
3ef397c1 MM |
4402 | functions. However, that would require the vtable pointer in |
4403 | base classes to have a different type than the vtable pointer | |
4404 | in derived classes. We could make that happen, but that | |
4405 | still wouldn't solve all the problems. In particular, the | |
4406 | type-based alias analysis code would decide that assignments | |
4407 | to the base class vtable pointer can't alias assignments to | |
4408 | the derived class vtable pointer, since they have different | |
4639c5c6 | 4409 | types. Thus, in a derived class destructor, where the base |
3ef397c1 | 4410 | class constructor was inlined, we could generate bad code for |
c8094d83 | 4411 | setting up the vtable pointer. |
3ef397c1 | 4412 | |
0cbd7506 | 4413 | Therefore, we use one type for all vtable pointers. We still |
3ef397c1 MM |
4414 | use a type-correct type; it's just doesn't indicate the array |
4415 | bounds. That's better than using `void*' or some such; it's | |
4416 | cleaner, and it let's the alias analysis code know that these | |
4417 | stores cannot alias stores to void*! */ | |
0abe00c5 NS |
4418 | tree field; |
4419 | ||
4420 | field = build_decl (FIELD_DECL, get_vfield_name (t), vtbl_ptr_type_node); | |
0abe00c5 NS |
4421 | DECL_VIRTUAL_P (field) = 1; |
4422 | DECL_ARTIFICIAL (field) = 1; | |
4423 | DECL_FIELD_CONTEXT (field) = t; | |
4424 | DECL_FCONTEXT (field) = t; | |
c8094d83 | 4425 | |
0abe00c5 | 4426 | TYPE_VFIELD (t) = field; |
c8094d83 | 4427 | |
0abe00c5 | 4428 | /* This class is non-empty. */ |
58731fd1 | 4429 | CLASSTYPE_EMPTY_P (t) = 0; |
3ef397c1 | 4430 | |
0abe00c5 | 4431 | return field; |
3ef397c1 | 4432 | } |
5c24fba6 MM |
4433 | |
4434 | return NULL_TREE; | |
3ef397c1 MM |
4435 | } |
4436 | ||
2ef16140 MM |
4437 | /* Fixup the inline function given by INFO now that the class is |
4438 | complete. */ | |
08b962b0 | 4439 | |
2ef16140 | 4440 | static void |
94edc4ab | 4441 | fixup_pending_inline (tree fn) |
2ef16140 | 4442 | { |
0e5921e8 | 4443 | if (DECL_PENDING_INLINE_INFO (fn)) |
2ef16140 | 4444 | { |
0e5921e8 | 4445 | tree args = DECL_ARGUMENTS (fn); |
2ef16140 MM |
4446 | while (args) |
4447 | { | |
4448 | DECL_CONTEXT (args) = fn; | |
4449 | args = TREE_CHAIN (args); | |
4450 | } | |
4451 | } | |
4452 | } | |
08b962b0 | 4453 | |
2ef16140 MM |
4454 | /* Fixup the inline methods and friends in TYPE now that TYPE is |
4455 | complete. */ | |
08b962b0 | 4456 | |
2ef16140 | 4457 | static void |
94edc4ab | 4458 | fixup_inline_methods (tree type) |
08b962b0 | 4459 | { |
2ef16140 | 4460 | tree method = TYPE_METHODS (type); |
d4e6fecb | 4461 | VEC(tree,gc) *friends; |
585b44d3 | 4462 | unsigned ix; |
08b962b0 | 4463 | |
2ef16140 | 4464 | if (method && TREE_CODE (method) == TREE_VEC) |
08b962b0 | 4465 | { |
2ef16140 MM |
4466 | if (TREE_VEC_ELT (method, 1)) |
4467 | method = TREE_VEC_ELT (method, 1); | |
4468 | else if (TREE_VEC_ELT (method, 0)) | |
4469 | method = TREE_VEC_ELT (method, 0); | |
08b962b0 | 4470 | else |
2ef16140 | 4471 | method = TREE_VEC_ELT (method, 2); |
08b962b0 MM |
4472 | } |
4473 | ||
2ef16140 MM |
4474 | /* Do inline member functions. */ |
4475 | for (; method; method = TREE_CHAIN (method)) | |
0e5921e8 | 4476 | fixup_pending_inline (method); |
08b962b0 | 4477 | |
2ef16140 | 4478 | /* Do friends. */ |
585b44d3 NS |
4479 | for (friends = CLASSTYPE_INLINE_FRIENDS (type), ix = 0; |
4480 | VEC_iterate (tree, friends, ix, method); ix++) | |
4481 | fixup_pending_inline (method); | |
4482 | CLASSTYPE_INLINE_FRIENDS (type) = NULL; | |
2ef16140 | 4483 | } |
08b962b0 | 4484 | |
9d4c0187 MM |
4485 | /* Add OFFSET to all base types of BINFO which is a base in the |
4486 | hierarchy dominated by T. | |
80fd5f48 | 4487 | |
911a71a7 | 4488 | OFFSET, which is a type offset, is number of bytes. */ |
80fd5f48 MM |
4489 | |
4490 | static void | |
dbbf88d1 | 4491 | propagate_binfo_offsets (tree binfo, tree offset) |
80fd5f48 | 4492 | { |
911a71a7 MM |
4493 | int i; |
4494 | tree primary_binfo; | |
fa743e8c | 4495 | tree base_binfo; |
80fd5f48 | 4496 | |
911a71a7 MM |
4497 | /* Update BINFO's offset. */ |
4498 | BINFO_OFFSET (binfo) | |
c8094d83 | 4499 | = convert (sizetype, |
911a71a7 MM |
4500 | size_binop (PLUS_EXPR, |
4501 | convert (ssizetype, BINFO_OFFSET (binfo)), | |
4502 | offset)); | |
80fd5f48 | 4503 | |
911a71a7 MM |
4504 | /* Find the primary base class. */ |
4505 | primary_binfo = get_primary_binfo (binfo); | |
4506 | ||
fc6633e0 | 4507 | if (primary_binfo && BINFO_INHERITANCE_CHAIN (primary_binfo) == binfo) |
090ad434 | 4508 | propagate_binfo_offsets (primary_binfo, offset); |
c8094d83 | 4509 | |
911a71a7 MM |
4510 | /* Scan all of the bases, pushing the BINFO_OFFSET adjust |
4511 | downwards. */ | |
fa743e8c | 4512 | for (i = 0; BINFO_BASE_ITERATE (binfo, i, base_binfo); ++i) |
80fd5f48 | 4513 | { |
090ad434 NS |
4514 | /* Don't do the primary base twice. */ |
4515 | if (base_binfo == primary_binfo) | |
4516 | continue; | |
911a71a7 | 4517 | |
090ad434 | 4518 | if (BINFO_VIRTUAL_P (base_binfo)) |
911a71a7 MM |
4519 | continue; |
4520 | ||
dbbf88d1 | 4521 | propagate_binfo_offsets (base_binfo, offset); |
911a71a7 | 4522 | } |
9d4c0187 MM |
4523 | } |
4524 | ||
17bbb839 | 4525 | /* Set BINFO_OFFSET for all of the virtual bases for RLI->T. Update |
c20118a8 MM |
4526 | TYPE_ALIGN and TYPE_SIZE for T. OFFSETS gives the location of |
4527 | empty subobjects of T. */ | |
80fd5f48 | 4528 | |
d2c5305b | 4529 | static void |
17bbb839 | 4530 | layout_virtual_bases (record_layout_info rli, splay_tree offsets) |
80fd5f48 | 4531 | { |
dbbf88d1 | 4532 | tree vbase; |
17bbb839 | 4533 | tree t = rli->t; |
eca7f13c | 4534 | bool first_vbase = true; |
17bbb839 | 4535 | tree *next_field; |
9785e4b1 | 4536 | |
604a3205 | 4537 | if (BINFO_N_BASE_BINFOS (TYPE_BINFO (t)) == 0) |
9785e4b1 MM |
4538 | return; |
4539 | ||
17bbb839 MM |
4540 | if (!abi_version_at_least(2)) |
4541 | { | |
4542 | /* In G++ 3.2, we incorrectly rounded the size before laying out | |
4543 | the virtual bases. */ | |
4544 | finish_record_layout (rli, /*free_p=*/false); | |
9785e4b1 | 4545 | #ifdef STRUCTURE_SIZE_BOUNDARY |
17bbb839 MM |
4546 | /* Packed structures don't need to have minimum size. */ |
4547 | if (! TYPE_PACKED (t)) | |
fc555370 | 4548 | TYPE_ALIGN (t) = MAX (TYPE_ALIGN (t), (unsigned) STRUCTURE_SIZE_BOUNDARY); |
9785e4b1 | 4549 | #endif |
17bbb839 MM |
4550 | rli->offset = TYPE_SIZE_UNIT (t); |
4551 | rli->bitpos = bitsize_zero_node; | |
4552 | rli->record_align = TYPE_ALIGN (t); | |
4553 | } | |
80fd5f48 | 4554 | |
17bbb839 MM |
4555 | /* Find the last field. The artificial fields created for virtual |
4556 | bases will go after the last extant field to date. */ | |
4557 | next_field = &TYPE_FIELDS (t); | |
4558 | while (*next_field) | |
4559 | next_field = &TREE_CHAIN (*next_field); | |
80fd5f48 | 4560 | |
9d4c0187 | 4561 | /* Go through the virtual bases, allocating space for each virtual |
3461fba7 NS |
4562 | base that is not already a primary base class. These are |
4563 | allocated in inheritance graph order. */ | |
dbbf88d1 | 4564 | for (vbase = TYPE_BINFO (t); vbase; vbase = TREE_CHAIN (vbase)) |
c35cce41 | 4565 | { |
809e3e7f | 4566 | if (!BINFO_VIRTUAL_P (vbase)) |
1f84ec23 | 4567 | continue; |
eca7f13c | 4568 | |
9965d119 | 4569 | if (!BINFO_PRIMARY_P (vbase)) |
c35cce41 | 4570 | { |
17bbb839 MM |
4571 | tree basetype = TREE_TYPE (vbase); |
4572 | ||
c35cce41 MM |
4573 | /* This virtual base is not a primary base of any class in the |
4574 | hierarchy, so we have to add space for it. */ | |
58731fd1 | 4575 | next_field = build_base_field (rli, vbase, |
17bbb839 | 4576 | offsets, next_field); |
9785e4b1 | 4577 | |
eca7f13c MM |
4578 | /* If the first virtual base might have been placed at a |
4579 | lower address, had we started from CLASSTYPE_SIZE, rather | |
4580 | than TYPE_SIZE, issue a warning. There can be both false | |
4581 | positives and false negatives from this warning in rare | |
4582 | cases; to deal with all the possibilities would probably | |
4583 | require performing both layout algorithms and comparing | |
4584 | the results which is not particularly tractable. */ | |
4585 | if (warn_abi | |
4586 | && first_vbase | |
c8094d83 | 4587 | && (tree_int_cst_lt |
17bbb839 MM |
4588 | (size_binop (CEIL_DIV_EXPR, |
4589 | round_up (CLASSTYPE_SIZE (t), | |
4590 | CLASSTYPE_ALIGN (basetype)), | |
4591 | bitsize_unit_node), | |
4592 | BINFO_OFFSET (vbase)))) | |
74fa0285 | 4593 | warning (OPT_Wabi, |
3db45ab5 | 4594 | "offset of virtual base %qT is not ABI-compliant and " |
0cbd7506 | 4595 | "may change in a future version of GCC", |
eca7f13c MM |
4596 | basetype); |
4597 | ||
eca7f13c | 4598 | first_vbase = false; |
c35cce41 MM |
4599 | } |
4600 | } | |
80fd5f48 MM |
4601 | } |
4602 | ||
ba9a991f MM |
4603 | /* Returns the offset of the byte just past the end of the base class |
4604 | BINFO. */ | |
4605 | ||
4606 | static tree | |
4607 | end_of_base (tree binfo) | |
4608 | { | |
4609 | tree size; | |
4610 | ||
1ad8aeeb DG |
4611 | if (!CLASSTYPE_AS_BASE (BINFO_TYPE (binfo))) |
4612 | size = TYPE_SIZE_UNIT (char_type_node); | |
4613 | else if (is_empty_class (BINFO_TYPE (binfo))) | |
ba9a991f MM |
4614 | /* An empty class has zero CLASSTYPE_SIZE_UNIT, but we need to |
4615 | allocate some space for it. It cannot have virtual bases, so | |
4616 | TYPE_SIZE_UNIT is fine. */ | |
4617 | size = TYPE_SIZE_UNIT (BINFO_TYPE (binfo)); | |
4618 | else | |
4619 | size = CLASSTYPE_SIZE_UNIT (BINFO_TYPE (binfo)); | |
4620 | ||
4621 | return size_binop (PLUS_EXPR, BINFO_OFFSET (binfo), size); | |
4622 | } | |
4623 | ||
9785e4b1 MM |
4624 | /* Returns the offset of the byte just past the end of the base class |
4625 | with the highest offset in T. If INCLUDE_VIRTUALS_P is zero, then | |
4626 | only non-virtual bases are included. */ | |
80fd5f48 | 4627 | |
17bbb839 | 4628 | static tree |
94edc4ab | 4629 | end_of_class (tree t, int include_virtuals_p) |
80fd5f48 | 4630 | { |
17bbb839 | 4631 | tree result = size_zero_node; |
d4e6fecb | 4632 | VEC(tree,gc) *vbases; |
ba9a991f | 4633 | tree binfo; |
9ba5ff0f | 4634 | tree base_binfo; |
ba9a991f | 4635 | tree offset; |
9785e4b1 | 4636 | int i; |
80fd5f48 | 4637 | |
fa743e8c NS |
4638 | for (binfo = TYPE_BINFO (t), i = 0; |
4639 | BINFO_BASE_ITERATE (binfo, i, base_binfo); ++i) | |
9785e4b1 | 4640 | { |
9785e4b1 | 4641 | if (!include_virtuals_p |
fc6633e0 NS |
4642 | && BINFO_VIRTUAL_P (base_binfo) |
4643 | && (!BINFO_PRIMARY_P (base_binfo) | |
4644 | || BINFO_INHERITANCE_CHAIN (base_binfo) != TYPE_BINFO (t))) | |
9785e4b1 | 4645 | continue; |
80fd5f48 | 4646 | |
fa743e8c | 4647 | offset = end_of_base (base_binfo); |
17bbb839 MM |
4648 | if (INT_CST_LT_UNSIGNED (result, offset)) |
4649 | result = offset; | |
9785e4b1 | 4650 | } |
80fd5f48 | 4651 | |
ba9a991f MM |
4652 | /* G++ 3.2 did not check indirect virtual bases. */ |
4653 | if (abi_version_at_least (2) && include_virtuals_p) | |
9ba5ff0f NS |
4654 | for (vbases = CLASSTYPE_VBASECLASSES (t), i = 0; |
4655 | VEC_iterate (tree, vbases, i, base_binfo); i++) | |
ba9a991f | 4656 | { |
9ba5ff0f | 4657 | offset = end_of_base (base_binfo); |
ba9a991f MM |
4658 | if (INT_CST_LT_UNSIGNED (result, offset)) |
4659 | result = offset; | |
4660 | } | |
4661 | ||
9785e4b1 | 4662 | return result; |
80fd5f48 MM |
4663 | } |
4664 | ||
17bbb839 | 4665 | /* Warn about bases of T that are inaccessible because they are |
78b45a24 MM |
4666 | ambiguous. For example: |
4667 | ||
4668 | struct S {}; | |
4669 | struct T : public S {}; | |
4670 | struct U : public S, public T {}; | |
4671 | ||
4672 | Here, `(S*) new U' is not allowed because there are two `S' | |
4673 | subobjects of U. */ | |
4674 | ||
4675 | static void | |
94edc4ab | 4676 | warn_about_ambiguous_bases (tree t) |
78b45a24 MM |
4677 | { |
4678 | int i; | |
d4e6fecb | 4679 | VEC(tree,gc) *vbases; |
17bbb839 | 4680 | tree basetype; |
58c42dc2 | 4681 | tree binfo; |
fa743e8c | 4682 | tree base_binfo; |
78b45a24 | 4683 | |
18e4be85 NS |
4684 | /* If there are no repeated bases, nothing can be ambiguous. */ |
4685 | if (!CLASSTYPE_REPEATED_BASE_P (t)) | |
4686 | return; | |
c8094d83 | 4687 | |
17bbb839 | 4688 | /* Check direct bases. */ |
fa743e8c NS |
4689 | for (binfo = TYPE_BINFO (t), i = 0; |
4690 | BINFO_BASE_ITERATE (binfo, i, base_binfo); ++i) | |
78b45a24 | 4691 | { |
fa743e8c | 4692 | basetype = BINFO_TYPE (base_binfo); |
78b45a24 | 4693 | |
18e4be85 | 4694 | if (!lookup_base (t, basetype, ba_unique | ba_quiet, NULL)) |
d4ee4d25 | 4695 | warning (0, "direct base %qT inaccessible in %qT due to ambiguity", |
17bbb839 | 4696 | basetype, t); |
78b45a24 | 4697 | } |
17bbb839 MM |
4698 | |
4699 | /* Check for ambiguous virtual bases. */ | |
4700 | if (extra_warnings) | |
9ba5ff0f NS |
4701 | for (vbases = CLASSTYPE_VBASECLASSES (t), i = 0; |
4702 | VEC_iterate (tree, vbases, i, binfo); i++) | |
17bbb839 | 4703 | { |
58c42dc2 | 4704 | basetype = BINFO_TYPE (binfo); |
c8094d83 | 4705 | |
18e4be85 | 4706 | if (!lookup_base (t, basetype, ba_unique | ba_quiet, NULL)) |
b323323f | 4707 | warning (OPT_Wextra, "virtual base %qT inaccessible in %qT due to ambiguity", |
17bbb839 MM |
4708 | basetype, t); |
4709 | } | |
78b45a24 MM |
4710 | } |
4711 | ||
c20118a8 MM |
4712 | /* Compare two INTEGER_CSTs K1 and K2. */ |
4713 | ||
4714 | static int | |
94edc4ab | 4715 | splay_tree_compare_integer_csts (splay_tree_key k1, splay_tree_key k2) |
c20118a8 MM |
4716 | { |
4717 | return tree_int_cst_compare ((tree) k1, (tree) k2); | |
4718 | } | |
4719 | ||
17bbb839 MM |
4720 | /* Increase the size indicated in RLI to account for empty classes |
4721 | that are "off the end" of the class. */ | |
4722 | ||
4723 | static void | |
4724 | include_empty_classes (record_layout_info rli) | |
4725 | { | |
4726 | tree eoc; | |
e3ccdd50 | 4727 | tree rli_size; |
17bbb839 MM |
4728 | |
4729 | /* It might be the case that we grew the class to allocate a | |
4730 | zero-sized base class. That won't be reflected in RLI, yet, | |
4731 | because we are willing to overlay multiple bases at the same | |
4732 | offset. However, now we need to make sure that RLI is big enough | |
4733 | to reflect the entire class. */ | |
c8094d83 | 4734 | eoc = end_of_class (rli->t, |
17bbb839 | 4735 | CLASSTYPE_AS_BASE (rli->t) != NULL_TREE); |
e3ccdd50 MM |
4736 | rli_size = rli_size_unit_so_far (rli); |
4737 | if (TREE_CODE (rli_size) == INTEGER_CST | |
4738 | && INT_CST_LT_UNSIGNED (rli_size, eoc)) | |
17bbb839 | 4739 | { |
43fe31f6 MM |
4740 | if (!abi_version_at_least (2)) |
4741 | /* In version 1 of the ABI, the size of a class that ends with | |
4742 | a bitfield was not rounded up to a whole multiple of a | |
4743 | byte. Because rli_size_unit_so_far returns only the number | |
4744 | of fully allocated bytes, any extra bits were not included | |
4745 | in the size. */ | |
4746 | rli->bitpos = round_down (rli->bitpos, BITS_PER_UNIT); | |
4747 | else | |
4748 | /* The size should have been rounded to a whole byte. */ | |
50bc768d NS |
4749 | gcc_assert (tree_int_cst_equal |
4750 | (rli->bitpos, round_down (rli->bitpos, BITS_PER_UNIT))); | |
c8094d83 MS |
4751 | rli->bitpos |
4752 | = size_binop (PLUS_EXPR, | |
e3ccdd50 MM |
4753 | rli->bitpos, |
4754 | size_binop (MULT_EXPR, | |
4755 | convert (bitsizetype, | |
4756 | size_binop (MINUS_EXPR, | |
4757 | eoc, rli_size)), | |
4758 | bitsize_int (BITS_PER_UNIT))); | |
4759 | normalize_rli (rli); | |
17bbb839 MM |
4760 | } |
4761 | } | |
4762 | ||
2ef16140 MM |
4763 | /* Calculate the TYPE_SIZE, TYPE_ALIGN, etc for T. Calculate |
4764 | BINFO_OFFSETs for all of the base-classes. Position the vtable | |
00a17e31 | 4765 | pointer. Accumulate declared virtual functions on VIRTUALS_P. */ |
607cf131 | 4766 | |
2ef16140 | 4767 | static void |
e93ee644 | 4768 | layout_class_type (tree t, tree *virtuals_p) |
2ef16140 | 4769 | { |
5c24fba6 MM |
4770 | tree non_static_data_members; |
4771 | tree field; | |
4772 | tree vptr; | |
4773 | record_layout_info rli; | |
c20118a8 MM |
4774 | /* Maps offsets (represented as INTEGER_CSTs) to a TREE_LIST of |
4775 | types that appear at that offset. */ | |
4776 | splay_tree empty_base_offsets; | |
eca7f13c MM |
4777 | /* True if the last field layed out was a bit-field. */ |
4778 | bool last_field_was_bitfield = false; | |
17bbb839 MM |
4779 | /* The location at which the next field should be inserted. */ |
4780 | tree *next_field; | |
4781 | /* T, as a base class. */ | |
4782 | tree base_t; | |
5c24fba6 MM |
4783 | |
4784 | /* Keep track of the first non-static data member. */ | |
4785 | non_static_data_members = TYPE_FIELDS (t); | |
4786 | ||
770ae6cc RK |
4787 | /* Start laying out the record. */ |
4788 | rli = start_record_layout (t); | |
534170eb | 4789 | |
fc6633e0 NS |
4790 | /* Mark all the primary bases in the hierarchy. */ |
4791 | determine_primary_bases (t); | |
8026246f | 4792 | |
5c24fba6 | 4793 | /* Create a pointer to our virtual function table. */ |
58731fd1 | 4794 | vptr = create_vtable_ptr (t, virtuals_p); |
5c24fba6 | 4795 | |
3461fba7 | 4796 | /* The vptr is always the first thing in the class. */ |
1f84ec23 | 4797 | if (vptr) |
5c24fba6 | 4798 | { |
17bbb839 MM |
4799 | TREE_CHAIN (vptr) = TYPE_FIELDS (t); |
4800 | TYPE_FIELDS (t) = vptr; | |
4801 | next_field = &TREE_CHAIN (vptr); | |
770ae6cc | 4802 | place_field (rli, vptr); |
5c24fba6 | 4803 | } |
17bbb839 MM |
4804 | else |
4805 | next_field = &TYPE_FIELDS (t); | |
5c24fba6 | 4806 | |
72a50ab0 | 4807 | /* Build FIELD_DECLs for all of the non-virtual base-types. */ |
c8094d83 | 4808 | empty_base_offsets = splay_tree_new (splay_tree_compare_integer_csts, |
c20118a8 | 4809 | NULL, NULL); |
58731fd1 | 4810 | build_base_fields (rli, empty_base_offsets, next_field); |
c8094d83 | 4811 | |
5c24fba6 | 4812 | /* Layout the non-static data members. */ |
770ae6cc | 4813 | for (field = non_static_data_members; field; field = TREE_CHAIN (field)) |
5c24fba6 | 4814 | { |
01955e96 MM |
4815 | tree type; |
4816 | tree padding; | |
5c24fba6 MM |
4817 | |
4818 | /* We still pass things that aren't non-static data members to | |
3b426391 | 4819 | the back end, in case it wants to do something with them. */ |
5c24fba6 MM |
4820 | if (TREE_CODE (field) != FIELD_DECL) |
4821 | { | |
770ae6cc | 4822 | place_field (rli, field); |
0154eaa8 | 4823 | /* If the static data member has incomplete type, keep track |
c8094d83 | 4824 | of it so that it can be completed later. (The handling |
0154eaa8 MM |
4825 | of pending statics in finish_record_layout is |
4826 | insufficient; consider: | |
4827 | ||
4828 | struct S1; | |
4829 | struct S2 { static S1 s1; }; | |
c8094d83 | 4830 | |
0cbd7506 | 4831 | At this point, finish_record_layout will be called, but |
0154eaa8 MM |
4832 | S1 is still incomplete.) */ |
4833 | if (TREE_CODE (field) == VAR_DECL) | |
532b37d9 MM |
4834 | { |
4835 | maybe_register_incomplete_var (field); | |
4836 | /* The visibility of static data members is determined | |
4837 | at their point of declaration, not their point of | |
4838 | definition. */ | |
4839 | determine_visibility (field); | |
4840 | } | |
5c24fba6 MM |
4841 | continue; |
4842 | } | |
4843 | ||
01955e96 | 4844 | type = TREE_TYPE (field); |
4e3bd7d5 VR |
4845 | if (type == error_mark_node) |
4846 | continue; | |
c8094d83 | 4847 | |
1e099144 | 4848 | padding = NULL_TREE; |
01955e96 MM |
4849 | |
4850 | /* If this field is a bit-field whose width is greater than its | |
3461fba7 NS |
4851 | type, then there are some special rules for allocating |
4852 | it. */ | |
01955e96 | 4853 | if (DECL_C_BIT_FIELD (field) |
1f84ec23 | 4854 | && INT_CST_LT (TYPE_SIZE (type), DECL_SIZE (field))) |
01955e96 MM |
4855 | { |
4856 | integer_type_kind itk; | |
4857 | tree integer_type; | |
555456b1 | 4858 | bool was_unnamed_p = false; |
01955e96 MM |
4859 | /* We must allocate the bits as if suitably aligned for the |
4860 | longest integer type that fits in this many bits. type | |
4861 | of the field. Then, we are supposed to use the left over | |
4862 | bits as additional padding. */ | |
4863 | for (itk = itk_char; itk != itk_none; ++itk) | |
c8094d83 | 4864 | if (INT_CST_LT (DECL_SIZE (field), |
01955e96 MM |
4865 | TYPE_SIZE (integer_types[itk]))) |
4866 | break; | |
4867 | ||
4868 | /* ITK now indicates a type that is too large for the | |
4869 | field. We have to back up by one to find the largest | |
4870 | type that fits. */ | |
4871 | integer_type = integer_types[itk - 1]; | |
2d3e278d | 4872 | |
1e099144 MM |
4873 | /* Figure out how much additional padding is required. GCC |
4874 | 3.2 always created a padding field, even if it had zero | |
4875 | width. */ | |
4876 | if (!abi_version_at_least (2) | |
4877 | || INT_CST_LT (TYPE_SIZE (integer_type), DECL_SIZE (field))) | |
2d3e278d | 4878 | { |
1e099144 MM |
4879 | if (abi_version_at_least (2) && TREE_CODE (t) == UNION_TYPE) |
4880 | /* In a union, the padding field must have the full width | |
4881 | of the bit-field; all fields start at offset zero. */ | |
4882 | padding = DECL_SIZE (field); | |
4883 | else | |
4884 | { | |
74fa0285 GDR |
4885 | if (TREE_CODE (t) == UNION_TYPE) |
4886 | warning (OPT_Wabi, "size assigned to %qT may not be " | |
1e099144 | 4887 | "ABI-compliant and may change in a future " |
c8094d83 | 4888 | "version of GCC", |
1e099144 MM |
4889 | t); |
4890 | padding = size_binop (MINUS_EXPR, DECL_SIZE (field), | |
4891 | TYPE_SIZE (integer_type)); | |
4892 | } | |
2d3e278d | 4893 | } |
c9372112 | 4894 | #ifdef PCC_BITFIELD_TYPE_MATTERS |
63e5f567 MM |
4895 | /* An unnamed bitfield does not normally affect the |
4896 | alignment of the containing class on a target where | |
4897 | PCC_BITFIELD_TYPE_MATTERS. But, the C++ ABI does not | |
4898 | make any exceptions for unnamed bitfields when the | |
4899 | bitfields are longer than their types. Therefore, we | |
4900 | temporarily give the field a name. */ | |
4901 | if (PCC_BITFIELD_TYPE_MATTERS && !DECL_NAME (field)) | |
4902 | { | |
4903 | was_unnamed_p = true; | |
4904 | DECL_NAME (field) = make_anon_name (); | |
4905 | } | |
c9372112 | 4906 | #endif |
01955e96 MM |
4907 | DECL_SIZE (field) = TYPE_SIZE (integer_type); |
4908 | DECL_ALIGN (field) = TYPE_ALIGN (integer_type); | |
11cf4d18 | 4909 | DECL_USER_ALIGN (field) = TYPE_USER_ALIGN (integer_type); |
555456b1 MM |
4910 | layout_nonempty_base_or_field (rli, field, NULL_TREE, |
4911 | empty_base_offsets); | |
4912 | if (was_unnamed_p) | |
4913 | DECL_NAME (field) = NULL_TREE; | |
4914 | /* Now that layout has been performed, set the size of the | |
4915 | field to the size of its declared type; the rest of the | |
4916 | field is effectively invisible. */ | |
4917 | DECL_SIZE (field) = TYPE_SIZE (type); | |
29edb15c MM |
4918 | /* We must also reset the DECL_MODE of the field. */ |
4919 | if (abi_version_at_least (2)) | |
4920 | DECL_MODE (field) = TYPE_MODE (type); | |
4921 | else if (warn_abi | |
4922 | && DECL_MODE (field) != TYPE_MODE (type)) | |
4923 | /* Versions of G++ before G++ 3.4 did not reset the | |
4924 | DECL_MODE. */ | |
74fa0285 | 4925 | warning (OPT_Wabi, |
3db45ab5 | 4926 | "the offset of %qD may not be ABI-compliant and may " |
29edb15c | 4927 | "change in a future version of GCC", field); |
01955e96 | 4928 | } |
555456b1 MM |
4929 | else |
4930 | layout_nonempty_base_or_field (rli, field, NULL_TREE, | |
4931 | empty_base_offsets); | |
01955e96 | 4932 | |
2003cd37 MM |
4933 | /* Remember the location of any empty classes in FIELD. */ |
4934 | if (abi_version_at_least (2)) | |
c8094d83 | 4935 | record_subobject_offsets (TREE_TYPE (field), |
2003cd37 MM |
4936 | byte_position(field), |
4937 | empty_base_offsets, | |
c5a35c3c | 4938 | /*is_data_member=*/true); |
2003cd37 | 4939 | |
eca7f13c MM |
4940 | /* If a bit-field does not immediately follow another bit-field, |
4941 | and yet it starts in the middle of a byte, we have failed to | |
4942 | comply with the ABI. */ | |
4943 | if (warn_abi | |
c8094d83 | 4944 | && DECL_C_BIT_FIELD (field) |
660845bf ZL |
4945 | /* The TREE_NO_WARNING flag gets set by Objective-C when |
4946 | laying out an Objective-C class. The ObjC ABI differs | |
4947 | from the C++ ABI, and so we do not want a warning | |
4948 | here. */ | |
4949 | && !TREE_NO_WARNING (field) | |
eca7f13c MM |
4950 | && !last_field_was_bitfield |
4951 | && !integer_zerop (size_binop (TRUNC_MOD_EXPR, | |
4952 | DECL_FIELD_BIT_OFFSET (field), | |
4953 | bitsize_unit_node))) | |
74fa0285 | 4954 | warning (OPT_Wabi, "offset of %q+D is not ABI-compliant and may " |
dee15844 | 4955 | "change in a future version of GCC", field); |
eca7f13c | 4956 | |
956d9305 MM |
4957 | /* G++ used to use DECL_FIELD_OFFSET as if it were the byte |
4958 | offset of the field. */ | |
c8094d83 | 4959 | if (warn_abi |
956d9305 MM |
4960 | && !tree_int_cst_equal (DECL_FIELD_OFFSET (field), |
4961 | byte_position (field)) | |
4962 | && contains_empty_class_p (TREE_TYPE (field))) | |
74fa0285 | 4963 | warning (OPT_Wabi, "%q+D contains empty classes which may cause base " |
dee15844 JM |
4964 | "classes to be placed at different locations in a " |
4965 | "future version of GCC", field); | |
956d9305 | 4966 | |
38a4afee MM |
4967 | /* The middle end uses the type of expressions to determine the |
4968 | possible range of expression values. In order to optimize | |
4969 | "x.i > 7" to "false" for a 2-bit bitfield "i", the middle end | |
3db45ab5 | 4970 | must be made aware of the width of "i", via its type. |
38a4afee | 4971 | |
3db45ab5 | 4972 | Because C++ does not have integer types of arbitrary width, |
38a4afee MM |
4973 | we must (for the purposes of the front end) convert from the |
4974 | type assigned here to the declared type of the bitfield | |
4975 | whenever a bitfield expression is used as an rvalue. | |
4976 | Similarly, when assigning a value to a bitfield, the value | |
4977 | must be converted to the type given the bitfield here. */ | |
4978 | if (DECL_C_BIT_FIELD (field)) | |
4979 | { | |
38a4afee | 4980 | unsigned HOST_WIDE_INT width; |
24030e4c | 4981 | tree ftype = TREE_TYPE (field); |
38a4afee MM |
4982 | width = tree_low_cst (DECL_SIZE (field), /*unsignedp=*/1); |
4983 | if (width != TYPE_PRECISION (ftype)) | |
24030e4c JJ |
4984 | { |
4985 | TREE_TYPE (field) | |
4986 | = c_build_bitfield_integer_type (width, | |
4987 | TYPE_UNSIGNED (ftype)); | |
4988 | TREE_TYPE (field) | |
4989 | = cp_build_qualified_type (TREE_TYPE (field), | |
4990 | TYPE_QUALS (ftype)); | |
4991 | } | |
38a4afee MM |
4992 | } |
4993 | ||
01955e96 MM |
4994 | /* If we needed additional padding after this field, add it |
4995 | now. */ | |
4996 | if (padding) | |
4997 | { | |
4998 | tree padding_field; | |
4999 | ||
c8094d83 | 5000 | padding_field = build_decl (FIELD_DECL, |
01955e96 | 5001 | NULL_TREE, |
c8094d83 | 5002 | char_type_node); |
01955e96 MM |
5003 | DECL_BIT_FIELD (padding_field) = 1; |
5004 | DECL_SIZE (padding_field) = padding; | |
1e099144 | 5005 | DECL_CONTEXT (padding_field) = t; |
ea258926 | 5006 | DECL_ARTIFICIAL (padding_field) = 1; |
78e0d62b | 5007 | DECL_IGNORED_P (padding_field) = 1; |
c20118a8 | 5008 | layout_nonempty_base_or_field (rli, padding_field, |
c8094d83 | 5009 | NULL_TREE, |
17bbb839 | 5010 | empty_base_offsets); |
01955e96 | 5011 | } |
eca7f13c MM |
5012 | |
5013 | last_field_was_bitfield = DECL_C_BIT_FIELD (field); | |
5c24fba6 MM |
5014 | } |
5015 | ||
17bbb839 | 5016 | if (abi_version_at_least (2) && !integer_zerop (rli->bitpos)) |
e3ccdd50 MM |
5017 | { |
5018 | /* Make sure that we are on a byte boundary so that the size of | |
5019 | the class without virtual bases will always be a round number | |
5020 | of bytes. */ | |
5021 | rli->bitpos = round_up (rli->bitpos, BITS_PER_UNIT); | |
5022 | normalize_rli (rli); | |
5023 | } | |
17bbb839 | 5024 | |
8a874cb4 MM |
5025 | /* G++ 3.2 does not allow virtual bases to be overlaid with tail |
5026 | padding. */ | |
5027 | if (!abi_version_at_least (2)) | |
5028 | include_empty_classes(rli); | |
58010b57 | 5029 | |
3ef397c1 MM |
5030 | /* Delete all zero-width bit-fields from the list of fields. Now |
5031 | that the type is laid out they are no longer important. */ | |
5032 | remove_zero_width_bit_fields (t); | |
5033 | ||
17bbb839 | 5034 | /* Create the version of T used for virtual bases. We do not use |
9e1e64ec | 5035 | make_class_type for this version; this is an artificial type. For |
17bbb839 | 5036 | a POD type, we just reuse T. */ |
58731fd1 | 5037 | if (CLASSTYPE_NON_POD_P (t) || CLASSTYPE_EMPTY_P (t)) |
06ceef4e | 5038 | { |
17bbb839 | 5039 | base_t = make_node (TREE_CODE (t)); |
c8094d83 | 5040 | |
58731fd1 MM |
5041 | /* Set the size and alignment for the new type. In G++ 3.2, all |
5042 | empty classes were considered to have size zero when used as | |
5043 | base classes. */ | |
5044 | if (!abi_version_at_least (2) && CLASSTYPE_EMPTY_P (t)) | |
5045 | { | |
5046 | TYPE_SIZE (base_t) = bitsize_zero_node; | |
5047 | TYPE_SIZE_UNIT (base_t) = size_zero_node; | |
5048 | if (warn_abi && !integer_zerop (rli_size_unit_so_far (rli))) | |
74fa0285 | 5049 | warning (OPT_Wabi, |
3db45ab5 | 5050 | "layout of classes derived from empty class %qT " |
58731fd1 MM |
5051 | "may change in a future version of GCC", |
5052 | t); | |
5053 | } | |
5054 | else | |
5055 | { | |
6b99d1c0 MM |
5056 | tree eoc; |
5057 | ||
5058 | /* If the ABI version is not at least two, and the last | |
5059 | field was a bit-field, RLI may not be on a byte | |
5060 | boundary. In particular, rli_size_unit_so_far might | |
5061 | indicate the last complete byte, while rli_size_so_far | |
5062 | indicates the total number of bits used. Therefore, | |
5063 | rli_size_so_far, rather than rli_size_unit_so_far, is | |
5064 | used to compute TYPE_SIZE_UNIT. */ | |
5065 | eoc = end_of_class (t, /*include_virtuals_p=*/0); | |
c8094d83 | 5066 | TYPE_SIZE_UNIT (base_t) |
8a874cb4 | 5067 | = size_binop (MAX_EXPR, |
6b99d1c0 MM |
5068 | convert (sizetype, |
5069 | size_binop (CEIL_DIV_EXPR, | |
5070 | rli_size_so_far (rli), | |
5071 | bitsize_int (BITS_PER_UNIT))), | |
5072 | eoc); | |
c8094d83 | 5073 | TYPE_SIZE (base_t) |
8a874cb4 MM |
5074 | = size_binop (MAX_EXPR, |
5075 | rli_size_so_far (rli), | |
5076 | size_binop (MULT_EXPR, | |
6b99d1c0 | 5077 | convert (bitsizetype, eoc), |
8a874cb4 | 5078 | bitsize_int (BITS_PER_UNIT))); |
58731fd1 | 5079 | } |
17bbb839 MM |
5080 | TYPE_ALIGN (base_t) = rli->record_align; |
5081 | TYPE_USER_ALIGN (base_t) = TYPE_USER_ALIGN (t); | |
5082 | ||
5083 | /* Copy the fields from T. */ | |
5084 | next_field = &TYPE_FIELDS (base_t); | |
5085 | for (field = TYPE_FIELDS (t); field; field = TREE_CHAIN (field)) | |
5086 | if (TREE_CODE (field) == FIELD_DECL) | |
5087 | { | |
5088 | *next_field = build_decl (FIELD_DECL, | |
c8094d83 | 5089 | DECL_NAME (field), |
17bbb839 MM |
5090 | TREE_TYPE (field)); |
5091 | DECL_CONTEXT (*next_field) = base_t; | |
5092 | DECL_FIELD_OFFSET (*next_field) = DECL_FIELD_OFFSET (field); | |
5093 | DECL_FIELD_BIT_OFFSET (*next_field) | |
5094 | = DECL_FIELD_BIT_OFFSET (field); | |
4f0a2b81 MM |
5095 | DECL_SIZE (*next_field) = DECL_SIZE (field); |
5096 | DECL_MODE (*next_field) = DECL_MODE (field); | |
17bbb839 MM |
5097 | next_field = &TREE_CHAIN (*next_field); |
5098 | } | |
5099 | ||
5100 | /* Record the base version of the type. */ | |
5101 | CLASSTYPE_AS_BASE (t) = base_t; | |
5a5cccaa | 5102 | TYPE_CONTEXT (base_t) = t; |
83b14b88 | 5103 | } |
1f84ec23 | 5104 | else |
17bbb839 | 5105 | CLASSTYPE_AS_BASE (t) = t; |
0b41abe6 | 5106 | |
5ec1192e MM |
5107 | /* Every empty class contains an empty class. */ |
5108 | if (CLASSTYPE_EMPTY_P (t)) | |
5109 | CLASSTYPE_CONTAINS_EMPTY_CLASS_P (t) = 1; | |
5110 | ||
8d08fdba MS |
5111 | /* Set the TYPE_DECL for this type to contain the right |
5112 | value for DECL_OFFSET, so that we can use it as part | |
5113 | of a COMPONENT_REF for multiple inheritance. */ | |
d2e5ee5c | 5114 | layout_decl (TYPE_MAIN_DECL (t), 0); |
8d08fdba | 5115 | |
7177d104 MS |
5116 | /* Now fix up any virtual base class types that we left lying |
5117 | around. We must get these done before we try to lay out the | |
5c24fba6 MM |
5118 | virtual function table. As a side-effect, this will remove the |
5119 | base subobject fields. */ | |
17bbb839 MM |
5120 | layout_virtual_bases (rli, empty_base_offsets); |
5121 | ||
c8094d83 | 5122 | /* Make sure that empty classes are reflected in RLI at this |
17bbb839 MM |
5123 | point. */ |
5124 | include_empty_classes(rli); | |
5125 | ||
5126 | /* Make sure not to create any structures with zero size. */ | |
58731fd1 | 5127 | if (integer_zerop (rli_size_unit_so_far (rli)) && CLASSTYPE_EMPTY_P (t)) |
c8094d83 | 5128 | place_field (rli, |
17bbb839 MM |
5129 | build_decl (FIELD_DECL, NULL_TREE, char_type_node)); |
5130 | ||
3b426391 | 5131 | /* Let the back end lay out the type. */ |
17bbb839 | 5132 | finish_record_layout (rli, /*free_p=*/true); |
9785e4b1 | 5133 | |
17bbb839 MM |
5134 | /* Warn about bases that can't be talked about due to ambiguity. */ |
5135 | warn_about_ambiguous_bases (t); | |
78b45a24 | 5136 | |
00bfffa4 JM |
5137 | /* Now that we're done with layout, give the base fields the real types. */ |
5138 | for (field = TYPE_FIELDS (t); field; field = TREE_CHAIN (field)) | |
5139 | if (DECL_ARTIFICIAL (field) && IS_FAKE_BASE_TYPE (TREE_TYPE (field))) | |
5140 | TREE_TYPE (field) = TYPE_CONTEXT (TREE_TYPE (field)); | |
5141 | ||
9785e4b1 | 5142 | /* Clean up. */ |
c20118a8 | 5143 | splay_tree_delete (empty_base_offsets); |
c5a35c3c MM |
5144 | |
5145 | if (CLASSTYPE_EMPTY_P (t) | |
3db45ab5 | 5146 | && tree_int_cst_lt (sizeof_biggest_empty_class, |
c0572427 MM |
5147 | TYPE_SIZE_UNIT (t))) |
5148 | sizeof_biggest_empty_class = TYPE_SIZE_UNIT (t); | |
2ef16140 | 5149 | } |
c35cce41 | 5150 | |
af287697 MM |
5151 | /* Determine the "key method" for the class type indicated by TYPE, |
5152 | and set CLASSTYPE_KEY_METHOD accordingly. */ | |
9aad8f83 | 5153 | |
af287697 MM |
5154 | void |
5155 | determine_key_method (tree type) | |
9aad8f83 MA |
5156 | { |
5157 | tree method; | |
5158 | ||
5159 | if (TYPE_FOR_JAVA (type) | |
5160 | || processing_template_decl | |
5161 | || CLASSTYPE_TEMPLATE_INSTANTIATION (type) | |
5162 | || CLASSTYPE_INTERFACE_KNOWN (type)) | |
af287697 | 5163 | return; |
9aad8f83 | 5164 | |
af287697 MM |
5165 | /* The key method is the first non-pure virtual function that is not |
5166 | inline at the point of class definition. On some targets the | |
5167 | key function may not be inline; those targets should not call | |
5168 | this function until the end of the translation unit. */ | |
9aad8f83 MA |
5169 | for (method = TYPE_METHODS (type); method != NULL_TREE; |
5170 | method = TREE_CHAIN (method)) | |
5171 | if (DECL_VINDEX (method) != NULL_TREE | |
5172 | && ! DECL_DECLARED_INLINE_P (method) | |
5173 | && ! DECL_PURE_VIRTUAL_P (method)) | |
af287697 MM |
5174 | { |
5175 | CLASSTYPE_KEY_METHOD (type) = method; | |
5176 | break; | |
5177 | } | |
9aad8f83 | 5178 | |
af287697 | 5179 | return; |
9aad8f83 MA |
5180 | } |
5181 | ||
548502d3 MM |
5182 | /* Perform processing required when the definition of T (a class type) |
5183 | is complete. */ | |
2ef16140 MM |
5184 | |
5185 | void | |
94edc4ab | 5186 | finish_struct_1 (tree t) |
2ef16140 MM |
5187 | { |
5188 | tree x; | |
00a17e31 | 5189 | /* A TREE_LIST. The TREE_VALUE of each node is a FUNCTION_DECL. */ |
e6858a84 | 5190 | tree virtuals = NULL_TREE; |
2ef16140 | 5191 | int n_fields = 0; |
2ef16140 | 5192 | |
d0f062fb | 5193 | if (COMPLETE_TYPE_P (t)) |
2ef16140 | 5194 | { |
9e1e64ec | 5195 | gcc_assert (MAYBE_CLASS_TYPE_P (t)); |
1f070f2b | 5196 | error ("redefinition of %q#T", t); |
2ef16140 MM |
5197 | popclass (); |
5198 | return; | |
5199 | } | |
5200 | ||
2ef16140 MM |
5201 | /* If this type was previously laid out as a forward reference, |
5202 | make sure we lay it out again. */ | |
2ef16140 | 5203 | TYPE_SIZE (t) = NULL_TREE; |
911a71a7 | 5204 | CLASSTYPE_PRIMARY_BINFO (t) = NULL_TREE; |
2ef16140 | 5205 | |
6d0a3f67 | 5206 | fixup_inline_methods (t); |
c8094d83 | 5207 | |
5ec1192e MM |
5208 | /* Make assumptions about the class; we'll reset the flags if |
5209 | necessary. */ | |
58731fd1 MM |
5210 | CLASSTYPE_EMPTY_P (t) = 1; |
5211 | CLASSTYPE_NEARLY_EMPTY_P (t) = 1; | |
5ec1192e | 5212 | CLASSTYPE_CONTAINS_EMPTY_CLASS_P (t) = 0; |
58731fd1 | 5213 | |
2ef16140 | 5214 | /* Do end-of-class semantic processing: checking the validity of the |
03702748 | 5215 | bases and members and add implicitly generated methods. */ |
58731fd1 | 5216 | check_bases_and_members (t); |
2ef16140 | 5217 | |
f4f206f4 | 5218 | /* Find the key method. */ |
a63996f1 | 5219 | if (TYPE_CONTAINS_VPTR_P (t)) |
9aad8f83 | 5220 | { |
af287697 MM |
5221 | /* The Itanium C++ ABI permits the key method to be chosen when |
5222 | the class is defined -- even though the key method so | |
5223 | selected may later turn out to be an inline function. On | |
5224 | some systems (such as ARM Symbian OS) the key method cannot | |
5225 | be determined until the end of the translation unit. On such | |
5226 | systems, we leave CLASSTYPE_KEY_METHOD set to NULL, which | |
5227 | will cause the class to be added to KEYED_CLASSES. Then, in | |
5228 | finish_file we will determine the key method. */ | |
5229 | if (targetm.cxx.key_method_may_be_inline ()) | |
5230 | determine_key_method (t); | |
9aad8f83 MA |
5231 | |
5232 | /* If a polymorphic class has no key method, we may emit the vtable | |
9bcb9aae | 5233 | in every translation unit where the class definition appears. */ |
9aad8f83 MA |
5234 | if (CLASSTYPE_KEY_METHOD (t) == NULL_TREE) |
5235 | keyed_classes = tree_cons (NULL_TREE, t, keyed_classes); | |
5236 | } | |
5237 | ||
2ef16140 | 5238 | /* Layout the class itself. */ |
e93ee644 | 5239 | layout_class_type (t, &virtuals); |
a0c68737 NS |
5240 | if (CLASSTYPE_AS_BASE (t) != t) |
5241 | /* We use the base type for trivial assignments, and hence it | |
5242 | needs a mode. */ | |
5243 | compute_record_mode (CLASSTYPE_AS_BASE (t)); | |
8ebeee52 | 5244 | |
e93ee644 | 5245 | virtuals = modify_all_vtables (t, nreverse (virtuals)); |
db5ae43f | 5246 | |
5e19c053 | 5247 | /* If necessary, create the primary vtable for this class. */ |
e6858a84 | 5248 | if (virtuals || TYPE_CONTAINS_VPTR_P (t)) |
8d08fdba | 5249 | { |
8d08fdba | 5250 | /* We must enter these virtuals into the table. */ |
3ef397c1 | 5251 | if (!CLASSTYPE_HAS_PRIMARY_BASE_P (t)) |
da3d4dfa | 5252 | build_primary_vtable (NULL_TREE, t); |
dbbf88d1 | 5253 | else if (! BINFO_NEW_VTABLE_MARKED (TYPE_BINFO (t))) |
0533d788 MM |
5254 | /* Here we know enough to change the type of our virtual |
5255 | function table, but we will wait until later this function. */ | |
28531dd0 | 5256 | build_primary_vtable (CLASSTYPE_PRIMARY_BINFO (t), t); |
8d08fdba MS |
5257 | } |
5258 | ||
bbd15aac | 5259 | if (TYPE_CONTAINS_VPTR_P (t)) |
8d08fdba | 5260 | { |
e93ee644 MM |
5261 | int vindex; |
5262 | tree fn; | |
5263 | ||
604a3205 | 5264 | if (BINFO_VTABLE (TYPE_BINFO (t))) |
50bc768d | 5265 | gcc_assert (DECL_VIRTUAL_P (BINFO_VTABLE (TYPE_BINFO (t)))); |
1eb4bea9 | 5266 | if (!CLASSTYPE_HAS_PRIMARY_BASE_P (t)) |
50bc768d | 5267 | gcc_assert (BINFO_VIRTUALS (TYPE_BINFO (t)) == NULL_TREE); |
1eb4bea9 | 5268 | |
e6858a84 | 5269 | /* Add entries for virtual functions introduced by this class. */ |
604a3205 NS |
5270 | BINFO_VIRTUALS (TYPE_BINFO (t)) |
5271 | = chainon (BINFO_VIRTUALS (TYPE_BINFO (t)), virtuals); | |
e93ee644 MM |
5272 | |
5273 | /* Set DECL_VINDEX for all functions declared in this class. */ | |
c8094d83 MS |
5274 | for (vindex = 0, fn = BINFO_VIRTUALS (TYPE_BINFO (t)); |
5275 | fn; | |
5276 | fn = TREE_CHAIN (fn), | |
e93ee644 MM |
5277 | vindex += (TARGET_VTABLE_USES_DESCRIPTORS |
5278 | ? TARGET_VTABLE_USES_DESCRIPTORS : 1)) | |
4977bab6 ZW |
5279 | { |
5280 | tree fndecl = BV_FN (fn); | |
5281 | ||
5282 | if (DECL_THUNK_P (fndecl)) | |
5283 | /* A thunk. We should never be calling this entry directly | |
5284 | from this vtable -- we'd use the entry for the non | |
5285 | thunk base function. */ | |
5286 | DECL_VINDEX (fndecl) = NULL_TREE; | |
5287 | else if (TREE_CODE (DECL_VINDEX (fndecl)) != INTEGER_CST) | |
7d60be94 | 5288 | DECL_VINDEX (fndecl) = build_int_cst (NULL_TREE, vindex); |
4977bab6 | 5289 | } |
8d08fdba MS |
5290 | } |
5291 | ||
d2c5305b | 5292 | finish_struct_bits (t); |
8d08fdba | 5293 | |
f30432d7 MS |
5294 | /* Complete the rtl for any static member objects of the type we're |
5295 | working on. */ | |
58010b57 | 5296 | for (x = TYPE_FIELDS (t); x; x = TREE_CHAIN (x)) |
19e7881c | 5297 | if (TREE_CODE (x) == VAR_DECL && TREE_STATIC (x) |
650fcd07 | 5298 | && TREE_TYPE (x) != error_mark_node |
c7f4981a | 5299 | && same_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (x)), t)) |
19e7881c | 5300 | DECL_MODE (x) = TYPE_MODE (t); |
8d08fdba | 5301 | |
f90cdf34 | 5302 | /* Done with FIELDS...now decide whether to sort these for |
58010b57 | 5303 | faster lookups later. |
f90cdf34 | 5304 | |
6c73ad72 | 5305 | We use a small number because most searches fail (succeeding |
f90cdf34 MT |
5306 | ultimately as the search bores through the inheritance |
5307 | hierarchy), and we want this failure to occur quickly. */ | |
5308 | ||
58010b57 MM |
5309 | n_fields = count_fields (TYPE_FIELDS (t)); |
5310 | if (n_fields > 7) | |
f90cdf34 | 5311 | { |
99dd239f | 5312 | struct sorted_fields_type *field_vec = GGC_NEWVAR |
0cbd7506 MS |
5313 | (struct sorted_fields_type, |
5314 | sizeof (struct sorted_fields_type) + n_fields * sizeof (tree)); | |
d07605f5 AP |
5315 | field_vec->len = n_fields; |
5316 | add_fields_to_record_type (TYPE_FIELDS (t), field_vec, 0); | |
5317 | qsort (field_vec->elts, n_fields, sizeof (tree), | |
17211ab5 | 5318 | field_decl_cmp); |
f90cdf34 MT |
5319 | if (! DECL_LANG_SPECIFIC (TYPE_MAIN_DECL (t))) |
5320 | retrofit_lang_decl (TYPE_MAIN_DECL (t)); | |
5321 | DECL_SORTED_FIELDS (TYPE_MAIN_DECL (t)) = field_vec; | |
5322 | } | |
5323 | ||
b9e75696 JM |
5324 | /* Complain if one of the field types requires lower visibility. */ |
5325 | constrain_class_visibility (t); | |
5326 | ||
8d7a5379 MM |
5327 | /* Make the rtl for any new vtables we have created, and unmark |
5328 | the base types we marked. */ | |
5329 | finish_vtbls (t); | |
c8094d83 | 5330 | |
23656158 MM |
5331 | /* Build the VTT for T. */ |
5332 | build_vtt (t); | |
8d7a5379 | 5333 | |
f03e8526 MM |
5334 | /* This warning does not make sense for Java classes, since they |
5335 | cannot have destructors. */ | |
5336 | if (!TYPE_FOR_JAVA (t) && warn_nonvdtor && TYPE_POLYMORPHIC_P (t)) | |
9fd8f60d | 5337 | { |
9f4faeae MM |
5338 | tree dtor; |
5339 | ||
5340 | dtor = CLASSTYPE_DESTRUCTORS (t); | |
9f4faeae MM |
5341 | if (/* An implicitly declared destructor is always public. And, |
5342 | if it were virtual, we would have created it by now. */ | |
5343 | !dtor | |
5344 | || (!DECL_VINDEX (dtor) | |
43f14744 PS |
5345 | && (/* public non-virtual */ |
5346 | (!TREE_PRIVATE (dtor) && !TREE_PROTECTED (dtor)) | |
5347 | || (/* non-public non-virtual with friends */ | |
5348 | (TREE_PRIVATE (dtor) || TREE_PROTECTED (dtor)) | |
5349 | && (CLASSTYPE_FRIEND_CLASSES (t) | |
5350 | || DECL_FRIENDLIST (TYPE_MAIN_DECL (t))))))) | |
5351 | warning (OPT_Wnon_virtual_dtor, | |
5352 | "%q#T has virtual functions and accessible" | |
5353 | " non-virtual destructor", t); | |
9fd8f60d | 5354 | } |
8d08fdba | 5355 | |
0154eaa8 | 5356 | complete_vars (t); |
8d08fdba | 5357 | |
9e9ff709 MS |
5358 | if (warn_overloaded_virtual) |
5359 | warn_hidden (t); | |
8d08fdba | 5360 | |
43d9ad1d DS |
5361 | /* Class layout, assignment of virtual table slots, etc., is now |
5362 | complete. Give the back end a chance to tweak the visibility of | |
5363 | the class or perform any other required target modifications. */ | |
5364 | targetm.cxx.adjust_class_at_definition (t); | |
5365 | ||
ae673f14 | 5366 | maybe_suppress_debug_info (t); |
8d08fdba | 5367 | |
b7442fb5 | 5368 | dump_class_hierarchy (t); |
c8094d83 | 5369 | |
d2e5ee5c | 5370 | /* Finish debugging output for this type. */ |
881c6935 | 5371 | rest_of_type_compilation (t, ! LOCAL_CLASS_P (t)); |
8d08fdba | 5372 | } |
f30432d7 | 5373 | |
61a127b3 MM |
5374 | /* When T was built up, the member declarations were added in reverse |
5375 | order. Rearrange them to declaration order. */ | |
5376 | ||
5377 | void | |
94edc4ab | 5378 | unreverse_member_declarations (tree t) |
61a127b3 MM |
5379 | { |
5380 | tree next; | |
5381 | tree prev; | |
5382 | tree x; | |
5383 | ||
7088fca9 KL |
5384 | /* The following lists are all in reverse order. Put them in |
5385 | declaration order now. */ | |
61a127b3 | 5386 | TYPE_METHODS (t) = nreverse (TYPE_METHODS (t)); |
7088fca9 | 5387 | CLASSTYPE_DECL_LIST (t) = nreverse (CLASSTYPE_DECL_LIST (t)); |
61a127b3 MM |
5388 | |
5389 | /* Actually, for the TYPE_FIELDS, only the non TYPE_DECLs are in | |
5390 | reverse order, so we can't just use nreverse. */ | |
5391 | prev = NULL_TREE; | |
c8094d83 MS |
5392 | for (x = TYPE_FIELDS (t); |
5393 | x && TREE_CODE (x) != TYPE_DECL; | |
61a127b3 MM |
5394 | x = next) |
5395 | { | |
5396 | next = TREE_CHAIN (x); | |
5397 | TREE_CHAIN (x) = prev; | |
5398 | prev = x; | |
5399 | } | |
5400 | if (prev) | |
5401 | { | |
5402 | TREE_CHAIN (TYPE_FIELDS (t)) = x; | |
5403 | if (prev) | |
5404 | TYPE_FIELDS (t) = prev; | |
5405 | } | |
5406 | } | |
5407 | ||
f30432d7 | 5408 | tree |
94edc4ab | 5409 | finish_struct (tree t, tree attributes) |
f30432d7 | 5410 | { |
82a98427 | 5411 | location_t saved_loc = input_location; |
1f0d71c5 | 5412 | |
61a127b3 MM |
5413 | /* Now that we've got all the field declarations, reverse everything |
5414 | as necessary. */ | |
5415 | unreverse_member_declarations (t); | |
f30432d7 | 5416 | |
91d231cb | 5417 | cplus_decl_attributes (&t, attributes, (int) ATTR_FLAG_TYPE_IN_PLACE); |
6467930b | 5418 | |
1f0d71c5 NS |
5419 | /* Nadger the current location so that diagnostics point to the start of |
5420 | the struct, not the end. */ | |
f31686a3 | 5421 | input_location = DECL_SOURCE_LOCATION (TYPE_NAME (t)); |
1f0d71c5 | 5422 | |
5566b478 | 5423 | if (processing_template_decl) |
f30432d7 | 5424 | { |
7fb213d8 GB |
5425 | tree x; |
5426 | ||
b0e0b31f | 5427 | finish_struct_methods (t); |
867580ce | 5428 | TYPE_SIZE (t) = bitsize_zero_node; |
ae54ec16 | 5429 | TYPE_SIZE_UNIT (t) = size_zero_node; |
7fb213d8 GB |
5430 | |
5431 | /* We need to emit an error message if this type was used as a parameter | |
5432 | and it is an abstract type, even if it is a template. We construct | |
5433 | a simple CLASSTYPE_PURE_VIRTUALS list without taking bases into | |
5434 | account and we call complete_vars with this type, which will check | |
5435 | the PARM_DECLS. Note that while the type is being defined, | |
5436 | CLASSTYPE_PURE_VIRTUALS contains the list of the inline friends | |
5437 | (see CLASSTYPE_INLINE_FRIENDS) so we need to clear it. */ | |
585b44d3 | 5438 | CLASSTYPE_PURE_VIRTUALS (t) = NULL; |
7fb213d8 GB |
5439 | for (x = TYPE_METHODS (t); x; x = TREE_CHAIN (x)) |
5440 | if (DECL_PURE_VIRTUAL_P (x)) | |
d4e6fecb | 5441 | VEC_safe_push (tree, gc, CLASSTYPE_PURE_VIRTUALS (t), x); |
7fb213d8 | 5442 | complete_vars (t); |
6f1b4c42 | 5443 | } |
f30432d7 | 5444 | else |
9f33663b | 5445 | finish_struct_1 (t); |
5566b478 | 5446 | |
82a98427 | 5447 | input_location = saved_loc; |
1f0d71c5 | 5448 | |
5566b478 | 5449 | TYPE_BEING_DEFINED (t) = 0; |
8f032717 | 5450 | |
5566b478 | 5451 | if (current_class_type) |
b74a0560 | 5452 | popclass (); |
5566b478 | 5453 | else |
357351e5 | 5454 | error ("trying to finish struct, but kicked out due to previous parse errors"); |
5566b478 | 5455 | |
5f261ba9 MM |
5456 | if (processing_template_decl && at_function_scope_p ()) |
5457 | add_stmt (build_min (TAG_DEFN, t)); | |
ae673f14 | 5458 | |
5566b478 | 5459 | return t; |
f30432d7 | 5460 | } |
8d08fdba | 5461 | \f |
51ddb82e | 5462 | /* Return the dynamic type of INSTANCE, if known. |
8d08fdba MS |
5463 | Used to determine whether the virtual function table is needed |
5464 | or not. | |
5465 | ||
5466 | *NONNULL is set iff INSTANCE can be known to be nonnull, regardless | |
97d953bb MM |
5467 | of our knowledge of its type. *NONNULL should be initialized |
5468 | before this function is called. */ | |
e92cc029 | 5469 | |
d8e178a0 | 5470 | static tree |
555551c2 | 5471 | fixed_type_or_null (tree instance, int *nonnull, int *cdtorp) |
8d08fdba | 5472 | { |
555551c2 MM |
5473 | #define RECUR(T) fixed_type_or_null((T), nonnull, cdtorp) |
5474 | ||
8d08fdba MS |
5475 | switch (TREE_CODE (instance)) |
5476 | { | |
5477 | case INDIRECT_REF: | |
608afcc5 | 5478 | if (POINTER_TYPE_P (TREE_TYPE (instance))) |
a0de9d20 JM |
5479 | return NULL_TREE; |
5480 | else | |
555551c2 | 5481 | return RECUR (TREE_OPERAND (instance, 0)); |
a0de9d20 | 5482 | |
8d08fdba MS |
5483 | case CALL_EXPR: |
5484 | /* This is a call to a constructor, hence it's never zero. */ | |
5485 | if (TREE_HAS_CONSTRUCTOR (instance)) | |
5486 | { | |
5487 | if (nonnull) | |
5488 | *nonnull = 1; | |
51ddb82e | 5489 | return TREE_TYPE (instance); |
8d08fdba | 5490 | } |
51ddb82e | 5491 | return NULL_TREE; |
8d08fdba MS |
5492 | |
5493 | case SAVE_EXPR: | |
5494 | /* This is a call to a constructor, hence it's never zero. */ | |
5495 | if (TREE_HAS_CONSTRUCTOR (instance)) | |
5496 | { | |
5497 | if (nonnull) | |
5498 | *nonnull = 1; | |
51ddb82e | 5499 | return TREE_TYPE (instance); |
8d08fdba | 5500 | } |
555551c2 | 5501 | return RECUR (TREE_OPERAND (instance, 0)); |
8d08fdba | 5502 | |
5be014d5 | 5503 | case POINTER_PLUS_EXPR: |
8d08fdba MS |
5504 | case PLUS_EXPR: |
5505 | case MINUS_EXPR: | |
394fd776 | 5506 | if (TREE_CODE (TREE_OPERAND (instance, 0)) == ADDR_EXPR) |
555551c2 | 5507 | return RECUR (TREE_OPERAND (instance, 0)); |
8d08fdba MS |
5508 | if (TREE_CODE (TREE_OPERAND (instance, 1)) == INTEGER_CST) |
5509 | /* Propagate nonnull. */ | |
555551c2 MM |
5510 | return RECUR (TREE_OPERAND (instance, 0)); |
5511 | ||
51ddb82e | 5512 | return NULL_TREE; |
8d08fdba | 5513 | |
63a906f0 | 5514 | CASE_CONVERT: |
555551c2 | 5515 | return RECUR (TREE_OPERAND (instance, 0)); |
8d08fdba MS |
5516 | |
5517 | case ADDR_EXPR: | |
88f19756 | 5518 | instance = TREE_OPERAND (instance, 0); |
8d08fdba | 5519 | if (nonnull) |
88f19756 RH |
5520 | { |
5521 | /* Just because we see an ADDR_EXPR doesn't mean we're dealing | |
5522 | with a real object -- given &p->f, p can still be null. */ | |
5523 | tree t = get_base_address (instance); | |
5524 | /* ??? Probably should check DECL_WEAK here. */ | |
5525 | if (t && DECL_P (t)) | |
5526 | *nonnull = 1; | |
5527 | } | |
555551c2 | 5528 | return RECUR (instance); |
8d08fdba MS |
5529 | |
5530 | case COMPONENT_REF: | |
642124c6 RH |
5531 | /* If this component is really a base class reference, then the field |
5532 | itself isn't definitive. */ | |
5533 | if (DECL_FIELD_IS_BASE (TREE_OPERAND (instance, 1))) | |
555551c2 MM |
5534 | return RECUR (TREE_OPERAND (instance, 0)); |
5535 | return RECUR (TREE_OPERAND (instance, 1)); | |
8d08fdba | 5536 | |
8d08fdba MS |
5537 | case VAR_DECL: |
5538 | case FIELD_DECL: | |
5539 | if (TREE_CODE (TREE_TYPE (instance)) == ARRAY_TYPE | |
9e1e64ec | 5540 | && MAYBE_CLASS_TYPE_P (TREE_TYPE (TREE_TYPE (instance)))) |
8d08fdba MS |
5541 | { |
5542 | if (nonnull) | |
5543 | *nonnull = 1; | |
51ddb82e | 5544 | return TREE_TYPE (TREE_TYPE (instance)); |
8d08fdba | 5545 | } |
e92cc029 | 5546 | /* fall through... */ |
8d08fdba MS |
5547 | case TARGET_EXPR: |
5548 | case PARM_DECL: | |
f63ab951 | 5549 | case RESULT_DECL: |
9e1e64ec | 5550 | if (MAYBE_CLASS_TYPE_P (TREE_TYPE (instance))) |
8d08fdba MS |
5551 | { |
5552 | if (nonnull) | |
5553 | *nonnull = 1; | |
51ddb82e | 5554 | return TREE_TYPE (instance); |
8d08fdba | 5555 | } |
394fd776 | 5556 | else if (instance == current_class_ptr) |
0cbd7506 MS |
5557 | { |
5558 | if (nonnull) | |
5559 | *nonnull = 1; | |
5560 | ||
5561 | /* if we're in a ctor or dtor, we know our type. */ | |
5562 | if (DECL_LANG_SPECIFIC (current_function_decl) | |
5563 | && (DECL_CONSTRUCTOR_P (current_function_decl) | |
5564 | || DECL_DESTRUCTOR_P (current_function_decl))) | |
5565 | { | |
5566 | if (cdtorp) | |
5567 | *cdtorp = 1; | |
5568 | return TREE_TYPE (TREE_TYPE (instance)); | |
5569 | } | |
5570 | } | |
394fd776 | 5571 | else if (TREE_CODE (TREE_TYPE (instance)) == REFERENCE_TYPE) |
0cbd7506 | 5572 | { |
555551c2 MM |
5573 | /* We only need one hash table because it is always left empty. */ |
5574 | static htab_t ht; | |
5575 | if (!ht) | |
5576 | ht = htab_create (37, | |
5577 | htab_hash_pointer, | |
5578 | htab_eq_pointer, | |
5579 | /*htab_del=*/NULL); | |
5580 | ||
0cbd7506 MS |
5581 | /* Reference variables should be references to objects. */ |
5582 | if (nonnull) | |
8d08fdba | 5583 | *nonnull = 1; |
c8094d83 | 5584 | |
555551c2 | 5585 | /* Enter the INSTANCE in a table to prevent recursion; a |
772f8889 MM |
5586 | variable's initializer may refer to the variable |
5587 | itself. */ | |
c8094d83 | 5588 | if (TREE_CODE (instance) == VAR_DECL |
772f8889 | 5589 | && DECL_INITIAL (instance) |
555551c2 | 5590 | && !htab_find (ht, instance)) |
772f8889 MM |
5591 | { |
5592 | tree type; | |
555551c2 MM |
5593 | void **slot; |
5594 | ||
5595 | slot = htab_find_slot (ht, instance, INSERT); | |
5596 | *slot = instance; | |
5597 | type = RECUR (DECL_INITIAL (instance)); | |
e656a465 | 5598 | htab_remove_elt (ht, instance); |
555551c2 | 5599 | |
772f8889 MM |
5600 | return type; |
5601 | } | |
8d08fdba | 5602 | } |
51ddb82e | 5603 | return NULL_TREE; |
8d08fdba MS |
5604 | |
5605 | default: | |
51ddb82e | 5606 | return NULL_TREE; |
8d08fdba | 5607 | } |
555551c2 | 5608 | #undef RECUR |
8d08fdba | 5609 | } |
51ddb82e | 5610 | |
838dfd8a | 5611 | /* Return nonzero if the dynamic type of INSTANCE is known, and |
338d90b8 NS |
5612 | equivalent to the static type. We also handle the case where |
5613 | INSTANCE is really a pointer. Return negative if this is a | |
5614 | ctor/dtor. There the dynamic type is known, but this might not be | |
5615 | the most derived base of the original object, and hence virtual | |
5616 | bases may not be layed out according to this type. | |
51ddb82e JM |
5617 | |
5618 | Used to determine whether the virtual function table is needed | |
5619 | or not. | |
5620 | ||
5621 | *NONNULL is set iff INSTANCE can be known to be nonnull, regardless | |
97d953bb MM |
5622 | of our knowledge of its type. *NONNULL should be initialized |
5623 | before this function is called. */ | |
51ddb82e JM |
5624 | |
5625 | int | |
94edc4ab | 5626 | resolves_to_fixed_type_p (tree instance, int* nonnull) |
51ddb82e JM |
5627 | { |
5628 | tree t = TREE_TYPE (instance); | |
394fd776 | 5629 | int cdtorp = 0; |
394fd776 | 5630 | tree fixed = fixed_type_or_null (instance, nonnull, &cdtorp); |
51ddb82e JM |
5631 | if (fixed == NULL_TREE) |
5632 | return 0; | |
5633 | if (POINTER_TYPE_P (t)) | |
5634 | t = TREE_TYPE (t); | |
394fd776 NS |
5635 | if (!same_type_ignoring_top_level_qualifiers_p (t, fixed)) |
5636 | return 0; | |
5637 | return cdtorp ? -1 : 1; | |
51ddb82e JM |
5638 | } |
5639 | ||
8d08fdba MS |
5640 | \f |
5641 | void | |
94edc4ab | 5642 | init_class_processing (void) |
8d08fdba MS |
5643 | { |
5644 | current_class_depth = 0; | |
61a127b3 | 5645 | current_class_stack_size = 10; |
c8094d83 | 5646 | current_class_stack |
0ac1b889 | 5647 | = XNEWVEC (struct class_stack_node, current_class_stack_size); |
806aa901 | 5648 | local_classes = VEC_alloc (tree, gc, 8); |
c5a35c3c | 5649 | sizeof_biggest_empty_class = size_zero_node; |
8d08fdba | 5650 | |
0e5921e8 ZW |
5651 | ridpointers[(int) RID_PUBLIC] = access_public_node; |
5652 | ridpointers[(int) RID_PRIVATE] = access_private_node; | |
5653 | ridpointers[(int) RID_PROTECTED] = access_protected_node; | |
8d08fdba MS |
5654 | } |
5655 | ||
39fb05d0 MM |
5656 | /* Restore the cached PREVIOUS_CLASS_LEVEL. */ |
5657 | ||
5658 | static void | |
5659 | restore_class_cache (void) | |
5660 | { | |
39fb05d0 | 5661 | tree type; |
39fb05d0 MM |
5662 | |
5663 | /* We are re-entering the same class we just left, so we don't | |
5664 | have to search the whole inheritance matrix to find all the | |
5665 | decls to bind again. Instead, we install the cached | |
5666 | class_shadowed list and walk through it binding names. */ | |
5667 | push_binding_level (previous_class_level); | |
5668 | class_binding_level = previous_class_level; | |
39fb05d0 | 5669 | /* Restore IDENTIFIER_TYPE_VALUE. */ |
c8094d83 MS |
5670 | for (type = class_binding_level->type_shadowed; |
5671 | type; | |
39fb05d0 MM |
5672 | type = TREE_CHAIN (type)) |
5673 | SET_IDENTIFIER_TYPE_VALUE (TREE_PURPOSE (type), TREE_TYPE (type)); | |
5674 | } | |
5675 | ||
a723baf1 MM |
5676 | /* Set global variables CURRENT_CLASS_NAME and CURRENT_CLASS_TYPE as |
5677 | appropriate for TYPE. | |
8d08fdba | 5678 | |
8d08fdba MS |
5679 | So that we may avoid calls to lookup_name, we cache the _TYPE |
5680 | nodes of local TYPE_DECLs in the TREE_TYPE field of the name. | |
5681 | ||
5682 | For multiple inheritance, we perform a two-pass depth-first search | |
39fb05d0 | 5683 | of the type lattice. */ |
8d08fdba MS |
5684 | |
5685 | void | |
29370796 | 5686 | pushclass (tree type) |
8d08fdba | 5687 | { |
c888c93b MM |
5688 | class_stack_node_t csn; |
5689 | ||
7fb4a8f7 | 5690 | type = TYPE_MAIN_VARIANT (type); |
8d08fdba | 5691 | |
61a127b3 | 5692 | /* Make sure there is enough room for the new entry on the stack. */ |
c8094d83 | 5693 | if (current_class_depth + 1 >= current_class_stack_size) |
8d08fdba | 5694 | { |
61a127b3 MM |
5695 | current_class_stack_size *= 2; |
5696 | current_class_stack | |
7767580e | 5697 | = XRESIZEVEC (struct class_stack_node, current_class_stack, |
3db45ab5 | 5698 | current_class_stack_size); |
8d08fdba MS |
5699 | } |
5700 | ||
61a127b3 | 5701 | /* Insert a new entry on the class stack. */ |
c888c93b MM |
5702 | csn = current_class_stack + current_class_depth; |
5703 | csn->name = current_class_name; | |
5704 | csn->type = current_class_type; | |
5705 | csn->access = current_access_specifier; | |
5706 | csn->names_used = 0; | |
5707 | csn->hidden = 0; | |
61a127b3 MM |
5708 | current_class_depth++; |
5709 | ||
5710 | /* Now set up the new type. */ | |
8d08fdba MS |
5711 | current_class_name = TYPE_NAME (type); |
5712 | if (TREE_CODE (current_class_name) == TYPE_DECL) | |
5713 | current_class_name = DECL_NAME (current_class_name); | |
5714 | current_class_type = type; | |
5715 | ||
61a127b3 MM |
5716 | /* By default, things in classes are private, while things in |
5717 | structures or unions are public. */ | |
c8094d83 MS |
5718 | current_access_specifier = (CLASSTYPE_DECLARED_CLASS (type) |
5719 | ? access_private_node | |
61a127b3 MM |
5720 | : access_public_node); |
5721 | ||
89b578be MM |
5722 | if (previous_class_level |
5723 | && type != previous_class_level->this_entity | |
8d08fdba MS |
5724 | && current_class_depth == 1) |
5725 | { | |
5726 | /* Forcibly remove any old class remnants. */ | |
8f032717 | 5727 | invalidate_class_lookup_cache (); |
8d08fdba MS |
5728 | } |
5729 | ||
c8094d83 | 5730 | if (!previous_class_level |
89b578be MM |
5731 | || type != previous_class_level->this_entity |
5732 | || current_class_depth > 1) | |
90ea9897 | 5733 | pushlevel_class (); |
29370796 | 5734 | else |
39fb05d0 | 5735 | restore_class_cache (); |
8f032717 MM |
5736 | } |
5737 | ||
39fb05d0 MM |
5738 | /* When we exit a toplevel class scope, we save its binding level so |
5739 | that we can restore it quickly. Here, we've entered some other | |
5740 | class, so we must invalidate our cache. */ | |
8d08fdba | 5741 | |
8f032717 | 5742 | void |
94edc4ab | 5743 | invalidate_class_lookup_cache (void) |
8f032717 | 5744 | { |
89b578be | 5745 | previous_class_level = NULL; |
8d08fdba | 5746 | } |
c8094d83 | 5747 | |
8d08fdba | 5748 | /* Get out of the current class scope. If we were in a class scope |
b74a0560 | 5749 | previously, that is the one popped to. */ |
e92cc029 | 5750 | |
8d08fdba | 5751 | void |
94edc4ab | 5752 | popclass (void) |
8d08fdba | 5753 | { |
273a708f | 5754 | poplevel_class (); |
8d08fdba MS |
5755 | |
5756 | current_class_depth--; | |
61a127b3 MM |
5757 | current_class_name = current_class_stack[current_class_depth].name; |
5758 | current_class_type = current_class_stack[current_class_depth].type; | |
5759 | current_access_specifier = current_class_stack[current_class_depth].access; | |
8f032717 MM |
5760 | if (current_class_stack[current_class_depth].names_used) |
5761 | splay_tree_delete (current_class_stack[current_class_depth].names_used); | |
8d08fdba MS |
5762 | } |
5763 | ||
c888c93b MM |
5764 | /* Mark the top of the class stack as hidden. */ |
5765 | ||
5766 | void | |
5767 | push_class_stack (void) | |
5768 | { | |
5769 | if (current_class_depth) | |
5770 | ++current_class_stack[current_class_depth - 1].hidden; | |
5771 | } | |
5772 | ||
5773 | /* Mark the top of the class stack as un-hidden. */ | |
5774 | ||
5775 | void | |
5776 | pop_class_stack (void) | |
5777 | { | |
5778 | if (current_class_depth) | |
5779 | --current_class_stack[current_class_depth - 1].hidden; | |
5780 | } | |
5781 | ||
fa6098f8 MM |
5782 | /* Returns 1 if the class type currently being defined is either T or |
5783 | a nested type of T. */ | |
b9082e8a | 5784 | |
fa6098f8 | 5785 | bool |
94edc4ab | 5786 | currently_open_class (tree t) |
b9082e8a JM |
5787 | { |
5788 | int i; | |
fa6098f8 | 5789 | |
1cb801bc JM |
5790 | if (!CLASS_TYPE_P (t)) |
5791 | return false; | |
5792 | ||
fa6098f8 MM |
5793 | /* We start looking from 1 because entry 0 is from global scope, |
5794 | and has no type. */ | |
5795 | for (i = current_class_depth; i > 0; --i) | |
c888c93b | 5796 | { |
fa6098f8 MM |
5797 | tree c; |
5798 | if (i == current_class_depth) | |
5799 | c = current_class_type; | |
5800 | else | |
5801 | { | |
5802 | if (current_class_stack[i].hidden) | |
5803 | break; | |
5804 | c = current_class_stack[i].type; | |
5805 | } | |
5806 | if (!c) | |
5807 | continue; | |
5808 | if (same_type_p (c, t)) | |
5809 | return true; | |
c888c93b | 5810 | } |
fa6098f8 | 5811 | return false; |
b9082e8a JM |
5812 | } |
5813 | ||
70adf8a9 JM |
5814 | /* If either current_class_type or one of its enclosing classes are derived |
5815 | from T, return the appropriate type. Used to determine how we found | |
5816 | something via unqualified lookup. */ | |
5817 | ||
5818 | tree | |
94edc4ab | 5819 | currently_open_derived_class (tree t) |
70adf8a9 JM |
5820 | { |
5821 | int i; | |
5822 | ||
9bcb9aae | 5823 | /* The bases of a dependent type are unknown. */ |
1fb3244a MM |
5824 | if (dependent_type_p (t)) |
5825 | return NULL_TREE; | |
5826 | ||
c44e68a5 KL |
5827 | if (!current_class_type) |
5828 | return NULL_TREE; | |
5829 | ||
70adf8a9 JM |
5830 | if (DERIVED_FROM_P (t, current_class_type)) |
5831 | return current_class_type; | |
5832 | ||
5833 | for (i = current_class_depth - 1; i > 0; --i) | |
c888c93b MM |
5834 | { |
5835 | if (current_class_stack[i].hidden) | |
5836 | break; | |
5837 | if (DERIVED_FROM_P (t, current_class_stack[i].type)) | |
5838 | return current_class_stack[i].type; | |
5839 | } | |
70adf8a9 JM |
5840 | |
5841 | return NULL_TREE; | |
5842 | } | |
5843 | ||
8d08fdba | 5844 | /* When entering a class scope, all enclosing class scopes' names with |
14d22dd6 MM |
5845 | static meaning (static variables, static functions, types and |
5846 | enumerators) have to be visible. This recursive function calls | |
5847 | pushclass for all enclosing class contexts until global or a local | |
5848 | scope is reached. TYPE is the enclosed class. */ | |
8d08fdba MS |
5849 | |
5850 | void | |
14d22dd6 | 5851 | push_nested_class (tree type) |
8d08fdba | 5852 | { |
b262d64c | 5853 | /* A namespace might be passed in error cases, like A::B:C. */ |
c8094d83 | 5854 | if (type == NULL_TREE |
56d0c6e3 | 5855 | || !CLASS_TYPE_P (type)) |
a28e3c7f | 5856 | return; |
c8094d83 | 5857 | |
56d0c6e3 | 5858 | push_nested_class (DECL_CONTEXT (TYPE_MAIN_DECL (type))); |
8d08fdba | 5859 | |
29370796 | 5860 | pushclass (type); |
8d08fdba MS |
5861 | } |
5862 | ||
a723baf1 | 5863 | /* Undoes a push_nested_class call. */ |
8d08fdba MS |
5864 | |
5865 | void | |
94edc4ab | 5866 | pop_nested_class (void) |
8d08fdba | 5867 | { |
d2e5ee5c | 5868 | tree context = DECL_CONTEXT (TYPE_MAIN_DECL (current_class_type)); |
8d08fdba | 5869 | |
b74a0560 | 5870 | popclass (); |
6b400b21 | 5871 | if (context && CLASS_TYPE_P (context)) |
b74a0560 | 5872 | pop_nested_class (); |
8d08fdba MS |
5873 | } |
5874 | ||
46ccf50a JM |
5875 | /* Returns the number of extern "LANG" blocks we are nested within. */ |
5876 | ||
5877 | int | |
94edc4ab | 5878 | current_lang_depth (void) |
46ccf50a | 5879 | { |
aff44741 | 5880 | return VEC_length (tree, current_lang_base); |
46ccf50a JM |
5881 | } |
5882 | ||
8d08fdba MS |
5883 | /* Set global variables CURRENT_LANG_NAME to appropriate value |
5884 | so that behavior of name-mangling machinery is correct. */ | |
5885 | ||
5886 | void | |
94edc4ab | 5887 | push_lang_context (tree name) |
8d08fdba | 5888 | { |
aff44741 | 5889 | VEC_safe_push (tree, gc, current_lang_base, current_lang_name); |
8d08fdba | 5890 | |
e229f2cd | 5891 | if (name == lang_name_cplusplus) |
8d08fdba | 5892 | { |
8d08fdba MS |
5893 | current_lang_name = name; |
5894 | } | |
e229f2cd PB |
5895 | else if (name == lang_name_java) |
5896 | { | |
e229f2cd PB |
5897 | current_lang_name = name; |
5898 | /* DECL_IGNORED_P is initially set for these types, to avoid clutter. | |
5899 | (See record_builtin_java_type in decl.c.) However, that causes | |
5900 | incorrect debug entries if these types are actually used. | |
00a17e31 | 5901 | So we re-enable debug output after extern "Java". */ |
e3cd9945 APB |
5902 | DECL_IGNORED_P (TYPE_NAME (java_byte_type_node)) = 0; |
5903 | DECL_IGNORED_P (TYPE_NAME (java_short_type_node)) = 0; | |
5904 | DECL_IGNORED_P (TYPE_NAME (java_int_type_node)) = 0; | |
5905 | DECL_IGNORED_P (TYPE_NAME (java_long_type_node)) = 0; | |
5906 | DECL_IGNORED_P (TYPE_NAME (java_float_type_node)) = 0; | |
5907 | DECL_IGNORED_P (TYPE_NAME (java_double_type_node)) = 0; | |
5908 | DECL_IGNORED_P (TYPE_NAME (java_char_type_node)) = 0; | |
5909 | DECL_IGNORED_P (TYPE_NAME (java_boolean_type_node)) = 0; | |
e229f2cd | 5910 | } |
8d08fdba MS |
5911 | else if (name == lang_name_c) |
5912 | { | |
8d08fdba MS |
5913 | current_lang_name = name; |
5914 | } | |
5915 | else | |
9e637a26 | 5916 | error ("language string %<\"%E\"%> not recognized", name); |
8d08fdba | 5917 | } |
c8094d83 | 5918 | |
8d08fdba | 5919 | /* Get out of the current language scope. */ |
e92cc029 | 5920 | |
8d08fdba | 5921 | void |
94edc4ab | 5922 | pop_lang_context (void) |
8d08fdba | 5923 | { |
aff44741 | 5924 | current_lang_name = VEC_pop (tree, current_lang_base); |
8d08fdba | 5925 | } |
8d08fdba MS |
5926 | \f |
5927 | /* Type instantiation routines. */ | |
5928 | ||
104bf76a MM |
5929 | /* Given an OVERLOAD and a TARGET_TYPE, return the function that |
5930 | matches the TARGET_TYPE. If there is no satisfactory match, return | |
eff3a276 MM |
5931 | error_mark_node, and issue an error & warning messages under |
5932 | control of FLAGS. Permit pointers to member function if FLAGS | |
5933 | permits. If TEMPLATE_ONLY, the name of the overloaded function was | |
5934 | a template-id, and EXPLICIT_TARGS are the explicitly provided | |
248e1b22 MM |
5935 | template arguments. |
5936 | ||
5937 | If OVERLOAD is for one or more member functions, then ACCESS_PATH | |
5938 | is the base path used to reference those member functions. If | |
5939 | TF_NO_ACCESS_CONTROL is not set in FLAGS, and the address is | |
5940 | resolved to a member function, access checks will be performed and | |
5941 | errors issued if appropriate. */ | |
104bf76a | 5942 | |
2c73f9f5 | 5943 | static tree |
c8094d83 | 5944 | resolve_address_of_overloaded_function (tree target_type, |
94edc4ab | 5945 | tree overload, |
92af500d NS |
5946 | tsubst_flags_t flags, |
5947 | bool template_only, | |
eff3a276 MM |
5948 | tree explicit_targs, |
5949 | tree access_path) | |
2c73f9f5 | 5950 | { |
104bf76a | 5951 | /* Here's what the standard says: |
c8094d83 | 5952 | |
104bf76a MM |
5953 | [over.over] |
5954 | ||
5955 | If the name is a function template, template argument deduction | |
5956 | is done, and if the argument deduction succeeds, the deduced | |
5957 | arguments are used to generate a single template function, which | |
5958 | is added to the set of overloaded functions considered. | |
5959 | ||
5960 | Non-member functions and static member functions match targets of | |
5961 | type "pointer-to-function" or "reference-to-function." Nonstatic | |
5962 | member functions match targets of type "pointer-to-member | |
5963 | function;" the function type of the pointer to member is used to | |
5964 | select the member function from the set of overloaded member | |
5965 | functions. If a nonstatic member function is selected, the | |
5966 | reference to the overloaded function name is required to have the | |
5967 | form of a pointer to member as described in 5.3.1. | |
5968 | ||
5969 | If more than one function is selected, any template functions in | |
5970 | the set are eliminated if the set also contains a non-template | |
5971 | function, and any given template function is eliminated if the | |
5972 | set contains a second template function that is more specialized | |
5973 | than the first according to the partial ordering rules 14.5.5.2. | |
5974 | After such eliminations, if any, there shall remain exactly one | |
5975 | selected function. */ | |
5976 | ||
5977 | int is_ptrmem = 0; | |
5978 | int is_reference = 0; | |
5979 | /* We store the matches in a TREE_LIST rooted here. The functions | |
5980 | are the TREE_PURPOSE, not the TREE_VALUE, in this list, for easy | |
5981 | interoperability with most_specialized_instantiation. */ | |
5982 | tree matches = NULL_TREE; | |
50714e79 | 5983 | tree fn; |
104bf76a | 5984 | |
d8f8dca1 MM |
5985 | /* By the time we get here, we should be seeing only real |
5986 | pointer-to-member types, not the internal POINTER_TYPE to | |
5987 | METHOD_TYPE representation. */ | |
50bc768d NS |
5988 | gcc_assert (TREE_CODE (target_type) != POINTER_TYPE |
5989 | || TREE_CODE (TREE_TYPE (target_type)) != METHOD_TYPE); | |
104bf76a | 5990 | |
50bc768d | 5991 | gcc_assert (is_overloaded_fn (overload)); |
c8094d83 | 5992 | |
104bf76a MM |
5993 | /* Check that the TARGET_TYPE is reasonable. */ |
5994 | if (TYPE_PTRFN_P (target_type)) | |
381ddaa6 | 5995 | /* This is OK. */; |
104bf76a MM |
5996 | else if (TYPE_PTRMEMFUNC_P (target_type)) |
5997 | /* This is OK, too. */ | |
5998 | is_ptrmem = 1; | |
5999 | else if (TREE_CODE (target_type) == FUNCTION_TYPE) | |
6000 | { | |
6001 | /* This is OK, too. This comes from a conversion to reference | |
6002 | type. */ | |
6003 | target_type = build_reference_type (target_type); | |
6004 | is_reference = 1; | |
6005 | } | |
c8094d83 | 6006 | else |
104bf76a | 6007 | { |
92af500d | 6008 | if (flags & tf_error) |
c4f73174 | 6009 | error ("cannot resolve overloaded function %qD based on" |
0cbd7506 MS |
6010 | " conversion to type %qT", |
6011 | DECL_NAME (OVL_FUNCTION (overload)), target_type); | |
104bf76a MM |
6012 | return error_mark_node; |
6013 | } | |
c8094d83 | 6014 | |
104bf76a MM |
6015 | /* If we can find a non-template function that matches, we can just |
6016 | use it. There's no point in generating template instantiations | |
6017 | if we're just going to throw them out anyhow. But, of course, we | |
6018 | can only do this when we don't *need* a template function. */ | |
6019 | if (!template_only) | |
6020 | { | |
6021 | tree fns; | |
6022 | ||
a723baf1 | 6023 | for (fns = overload; fns; fns = OVL_NEXT (fns)) |
104bf76a | 6024 | { |
a723baf1 | 6025 | tree fn = OVL_CURRENT (fns); |
104bf76a | 6026 | tree fntype; |
2c73f9f5 | 6027 | |
104bf76a MM |
6028 | if (TREE_CODE (fn) == TEMPLATE_DECL) |
6029 | /* We're not looking for templates just yet. */ | |
6030 | continue; | |
6031 | ||
6032 | if ((TREE_CODE (TREE_TYPE (fn)) == METHOD_TYPE) | |
6033 | != is_ptrmem) | |
6034 | /* We're looking for a non-static member, and this isn't | |
6035 | one, or vice versa. */ | |
6036 | continue; | |
34ff2673 | 6037 | |
d63d5d0c ILT |
6038 | /* Ignore functions which haven't been explicitly |
6039 | declared. */ | |
34ff2673 RS |
6040 | if (DECL_ANTICIPATED (fn)) |
6041 | continue; | |
6042 | ||
104bf76a MM |
6043 | /* See if there's a match. */ |
6044 | fntype = TREE_TYPE (fn); | |
6045 | if (is_ptrmem) | |
6046 | fntype = build_ptrmemfunc_type (build_pointer_type (fntype)); | |
6047 | else if (!is_reference) | |
6048 | fntype = build_pointer_type (fntype); | |
6049 | ||
30f86ec3 | 6050 | if (can_convert_arg (target_type, fntype, fn, LOOKUP_NORMAL)) |
e1b3e07d | 6051 | matches = tree_cons (fn, NULL_TREE, matches); |
104bf76a MM |
6052 | } |
6053 | } | |
6054 | ||
6055 | /* Now, if we've already got a match (or matches), there's no need | |
6056 | to proceed to the template functions. But, if we don't have a | |
6057 | match we need to look at them, too. */ | |
c8094d83 | 6058 | if (!matches) |
2c73f9f5 | 6059 | { |
104bf76a MM |
6060 | tree target_fn_type; |
6061 | tree target_arg_types; | |
8d3631f8 | 6062 | tree target_ret_type; |
104bf76a MM |
6063 | tree fns; |
6064 | ||
6065 | if (is_ptrmem) | |
4393e105 MM |
6066 | target_fn_type |
6067 | = TREE_TYPE (TYPE_PTRMEMFUNC_FN_TYPE (target_type)); | |
2c73f9f5 | 6068 | else |
4393e105 MM |
6069 | target_fn_type = TREE_TYPE (target_type); |
6070 | target_arg_types = TYPE_ARG_TYPES (target_fn_type); | |
8d3631f8 | 6071 | target_ret_type = TREE_TYPE (target_fn_type); |
e5214479 JM |
6072 | |
6073 | /* Never do unification on the 'this' parameter. */ | |
6074 | if (TREE_CODE (target_fn_type) == METHOD_TYPE) | |
6075 | target_arg_types = TREE_CHAIN (target_arg_types); | |
c8094d83 | 6076 | |
a723baf1 | 6077 | for (fns = overload; fns; fns = OVL_NEXT (fns)) |
104bf76a | 6078 | { |
a723baf1 | 6079 | tree fn = OVL_CURRENT (fns); |
104bf76a MM |
6080 | tree instantiation; |
6081 | tree instantiation_type; | |
6082 | tree targs; | |
6083 | ||
6084 | if (TREE_CODE (fn) != TEMPLATE_DECL) | |
6085 | /* We're only looking for templates. */ | |
6086 | continue; | |
6087 | ||
6088 | if ((TREE_CODE (TREE_TYPE (fn)) == METHOD_TYPE) | |
6089 | != is_ptrmem) | |
4393e105 | 6090 | /* We're not looking for a non-static member, and this is |
104bf76a MM |
6091 | one, or vice versa. */ |
6092 | continue; | |
6093 | ||
104bf76a | 6094 | /* Try to do argument deduction. */ |
f31c0a32 | 6095 | targs = make_tree_vec (DECL_NTPARMS (fn)); |
4393e105 | 6096 | if (fn_type_unification (fn, explicit_targs, targs, |
8d3631f8 | 6097 | target_arg_types, target_ret_type, |
30f86ec3 | 6098 | DEDUCE_EXACT, LOOKUP_NORMAL)) |
104bf76a MM |
6099 | /* Argument deduction failed. */ |
6100 | continue; | |
6101 | ||
6102 | /* Instantiate the template. */ | |
92af500d | 6103 | instantiation = instantiate_template (fn, targs, flags); |
104bf76a MM |
6104 | if (instantiation == error_mark_node) |
6105 | /* Instantiation failed. */ | |
6106 | continue; | |
6107 | ||
6108 | /* See if there's a match. */ | |
6109 | instantiation_type = TREE_TYPE (instantiation); | |
6110 | if (is_ptrmem) | |
c8094d83 | 6111 | instantiation_type = |
104bf76a MM |
6112 | build_ptrmemfunc_type (build_pointer_type (instantiation_type)); |
6113 | else if (!is_reference) | |
6114 | instantiation_type = build_pointer_type (instantiation_type); | |
3db45ab5 | 6115 | if (can_convert_arg (target_type, instantiation_type, instantiation, |
30f86ec3 | 6116 | LOOKUP_NORMAL)) |
e1b3e07d | 6117 | matches = tree_cons (instantiation, fn, matches); |
104bf76a MM |
6118 | } |
6119 | ||
6120 | /* Now, remove all but the most specialized of the matches. */ | |
6121 | if (matches) | |
6122 | { | |
e5214479 | 6123 | tree match = most_specialized_instantiation (matches); |
104bf76a MM |
6124 | |
6125 | if (match != error_mark_node) | |
3db45ab5 MS |
6126 | matches = tree_cons (TREE_PURPOSE (match), |
6127 | NULL_TREE, | |
7ca383e6 | 6128 | NULL_TREE); |
104bf76a MM |
6129 | } |
6130 | } | |
6131 | ||
6132 | /* Now we should have exactly one function in MATCHES. */ | |
6133 | if (matches == NULL_TREE) | |
6134 | { | |
6135 | /* There were *no* matches. */ | |
92af500d | 6136 | if (flags & tf_error) |
104bf76a | 6137 | { |
0cbd7506 MS |
6138 | error ("no matches converting function %qD to type %q#T", |
6139 | DECL_NAME (OVL_FUNCTION (overload)), | |
6140 | target_type); | |
6b9b6b15 JM |
6141 | |
6142 | /* print_candidates expects a chain with the functions in | |
0cbd7506 MS |
6143 | TREE_VALUE slots, so we cons one up here (we're losing anyway, |
6144 | so why be clever?). */ | |
6145 | for (; overload; overload = OVL_NEXT (overload)) | |
6146 | matches = tree_cons (NULL_TREE, OVL_CURRENT (overload), | |
e1b3e07d | 6147 | matches); |
c8094d83 | 6148 | |
6b9b6b15 | 6149 | print_candidates (matches); |
104bf76a MM |
6150 | } |
6151 | return error_mark_node; | |
2c73f9f5 | 6152 | } |
104bf76a MM |
6153 | else if (TREE_CHAIN (matches)) |
6154 | { | |
6155 | /* There were too many matches. */ | |
6156 | ||
92af500d | 6157 | if (flags & tf_error) |
104bf76a MM |
6158 | { |
6159 | tree match; | |
6160 | ||
0cbd7506 | 6161 | error ("converting overloaded function %qD to type %q#T is ambiguous", |
104bf76a MM |
6162 | DECL_NAME (OVL_FUNCTION (overload)), |
6163 | target_type); | |
6164 | ||
6165 | /* Since print_candidates expects the functions in the | |
6166 | TREE_VALUE slot, we flip them here. */ | |
6167 | for (match = matches; match; match = TREE_CHAIN (match)) | |
6168 | TREE_VALUE (match) = TREE_PURPOSE (match); | |
6169 | ||
6170 | print_candidates (matches); | |
6171 | } | |
c8094d83 | 6172 | |
104bf76a MM |
6173 | return error_mark_node; |
6174 | } | |
6175 | ||
50714e79 MM |
6176 | /* Good, exactly one match. Now, convert it to the correct type. */ |
6177 | fn = TREE_PURPOSE (matches); | |
6178 | ||
b1ce3eb2 | 6179 | if (DECL_NONSTATIC_MEMBER_FUNCTION_P (fn) |
92af500d | 6180 | && !(flags & tf_ptrmem_ok) && !flag_ms_extensions) |
19420d00 | 6181 | { |
b1ce3eb2 | 6182 | static int explained; |
c8094d83 | 6183 | |
92af500d | 6184 | if (!(flags & tf_error)) |
0cbd7506 | 6185 | return error_mark_node; |
19420d00 | 6186 | |
cbe5f3b3 | 6187 | permerror (input_location, "assuming pointer to member %qD", fn); |
b1ce3eb2 | 6188 | if (!explained) |
0cbd7506 | 6189 | { |
1f5b3869 | 6190 | inform (input_location, "(a pointer to member can only be formed with %<&%E%>)", fn); |
0cbd7506 MS |
6191 | explained = 1; |
6192 | } | |
19420d00 | 6193 | } |
84583208 MM |
6194 | |
6195 | /* If we're doing overload resolution purely for the purpose of | |
6196 | determining conversion sequences, we should not consider the | |
6197 | function used. If this conversion sequence is selected, the | |
6198 | function will be marked as used at this point. */ | |
6199 | if (!(flags & tf_conv)) | |
eff3a276 | 6200 | { |
4ad610c9 JM |
6201 | /* Make =delete work with SFINAE. */ |
6202 | if (DECL_DELETED_FN (fn) && !(flags & tf_error)) | |
6203 | return error_mark_node; | |
6204 | ||
eff3a276 | 6205 | mark_used (fn); |
248e1b22 MM |
6206 | } |
6207 | ||
6208 | /* We could not check access to member functions when this | |
6209 | expression was originally created since we did not know at that | |
6210 | time to which function the expression referred. */ | |
6211 | if (!(flags & tf_no_access_control) | |
6212 | && DECL_FUNCTION_MEMBER_P (fn)) | |
6213 | { | |
6214 | gcc_assert (access_path); | |
6215 | perform_or_defer_access_check (access_path, fn, fn); | |
eff3a276 | 6216 | } |
a6ecf8b6 | 6217 | |
50714e79 | 6218 | if (TYPE_PTRFN_P (target_type) || TYPE_PTRMEMFUNC_P (target_type)) |
5ade1ed2 | 6219 | return cp_build_unary_op (ADDR_EXPR, fn, 0, flags); |
50714e79 MM |
6220 | else |
6221 | { | |
5ade1ed2 | 6222 | /* The target must be a REFERENCE_TYPE. Above, cp_build_unary_op |
50714e79 MM |
6223 | will mark the function as addressed, but here we must do it |
6224 | explicitly. */ | |
dffd7eb6 | 6225 | cxx_mark_addressable (fn); |
50714e79 MM |
6226 | |
6227 | return fn; | |
6228 | } | |
2c73f9f5 ML |
6229 | } |
6230 | ||
ec255269 MS |
6231 | /* This function will instantiate the type of the expression given in |
6232 | RHS to match the type of LHSTYPE. If errors exist, then return | |
92af500d | 6233 | error_mark_node. FLAGS is a bit mask. If TF_ERROR is set, then |
5e76004e NS |
6234 | we complain on errors. If we are not complaining, never modify rhs, |
6235 | as overload resolution wants to try many possible instantiations, in | |
6236 | the hope that at least one will work. | |
c8094d83 | 6237 | |
e6e174e5 JM |
6238 | For non-recursive calls, LHSTYPE should be a function, pointer to |
6239 | function, or a pointer to member function. */ | |
e92cc029 | 6240 | |
8d08fdba | 6241 | tree |
94edc4ab | 6242 | instantiate_type (tree lhstype, tree rhs, tsubst_flags_t flags) |
8d08fdba | 6243 | { |
92af500d | 6244 | tsubst_flags_t flags_in = flags; |
eff3a276 | 6245 | tree access_path = NULL_TREE; |
c8094d83 | 6246 | |
c2ea3a40 | 6247 | flags &= ~tf_ptrmem_ok; |
c8094d83 | 6248 | |
8d08fdba MS |
6249 | if (TREE_CODE (lhstype) == UNKNOWN_TYPE) |
6250 | { | |
92af500d | 6251 | if (flags & tf_error) |
8251199e | 6252 | error ("not enough type information"); |
8d08fdba MS |
6253 | return error_mark_node; |
6254 | } | |
6255 | ||
6256 | if (TREE_TYPE (rhs) != NULL_TREE && ! (type_unknown_p (rhs))) | |
abff8e06 | 6257 | { |
8f4b394d | 6258 | if (same_type_p (lhstype, TREE_TYPE (rhs))) |
abff8e06 | 6259 | return rhs; |
c8094d83 | 6260 | if (flag_ms_extensions |
a723baf1 MM |
6261 | && TYPE_PTRMEMFUNC_P (lhstype) |
6262 | && !TYPE_PTRMEMFUNC_P (TREE_TYPE (rhs))) | |
6263 | /* Microsoft allows `A::f' to be resolved to a | |
6264 | pointer-to-member. */ | |
6265 | ; | |
6266 | else | |
6267 | { | |
92af500d | 6268 | if (flags & tf_error) |
1f070f2b | 6269 | error ("argument of type %qT does not match %qT", |
a723baf1 MM |
6270 | TREE_TYPE (rhs), lhstype); |
6271 | return error_mark_node; | |
6272 | } | |
abff8e06 | 6273 | } |
8d08fdba | 6274 | |
50ad9642 | 6275 | if (TREE_CODE (rhs) == BASELINK) |
eff3a276 MM |
6276 | { |
6277 | access_path = BASELINK_ACCESS_BINFO (rhs); | |
6278 | rhs = BASELINK_FUNCTIONS (rhs); | |
6279 | } | |
50ad9642 | 6280 | |
5ae9ba3e MM |
6281 | /* If we are in a template, and have a NON_DEPENDENT_EXPR, we cannot |
6282 | deduce any type information. */ | |
6283 | if (TREE_CODE (rhs) == NON_DEPENDENT_EXPR) | |
6284 | { | |
6285 | if (flags & tf_error) | |
6286 | error ("not enough type information"); | |
6287 | return error_mark_node; | |
6288 | } | |
6289 | ||
eff3a276 MM |
6290 | /* There only a few kinds of expressions that may have a type |
6291 | dependent on overload resolution. */ | |
6292 | gcc_assert (TREE_CODE (rhs) == ADDR_EXPR | |
6293 | || TREE_CODE (rhs) == COMPONENT_REF | |
6294 | || TREE_CODE (rhs) == COMPOUND_EXPR | |
6295 | || really_overloaded_fn (rhs)); | |
6296 | ||
2c73f9f5 ML |
6297 | /* We don't overwrite rhs if it is an overloaded function. |
6298 | Copying it would destroy the tree link. */ | |
6299 | if (TREE_CODE (rhs) != OVERLOAD) | |
6300 | rhs = copy_node (rhs); | |
c73964b2 | 6301 | |
8d08fdba MS |
6302 | /* This should really only be used when attempting to distinguish |
6303 | what sort of a pointer to function we have. For now, any | |
6304 | arithmetic operation which is not supported on pointers | |
6305 | is rejected as an error. */ | |
6306 | ||
6307 | switch (TREE_CODE (rhs)) | |
6308 | { | |
8d08fdba | 6309 | case COMPONENT_REF: |
92af500d | 6310 | { |
5ae9ba3e | 6311 | tree member = TREE_OPERAND (rhs, 1); |
92af500d | 6312 | |
5ae9ba3e MM |
6313 | member = instantiate_type (lhstype, member, flags); |
6314 | if (member != error_mark_node | |
92af500d | 6315 | && TREE_SIDE_EFFECTS (TREE_OPERAND (rhs, 0))) |
04c06002 | 6316 | /* Do not lose object's side effects. */ |
5ae9ba3e MM |
6317 | return build2 (COMPOUND_EXPR, TREE_TYPE (member), |
6318 | TREE_OPERAND (rhs, 0), member); | |
6319 | return member; | |
92af500d | 6320 | } |
8d08fdba | 6321 | |
2a238a97 | 6322 | case OFFSET_REF: |
05e0b2f4 JM |
6323 | rhs = TREE_OPERAND (rhs, 1); |
6324 | if (BASELINK_P (rhs)) | |
eff3a276 | 6325 | return instantiate_type (lhstype, rhs, flags_in); |
05e0b2f4 | 6326 | |
2a238a97 MM |
6327 | /* This can happen if we are forming a pointer-to-member for a |
6328 | member template. */ | |
50bc768d | 6329 | gcc_assert (TREE_CODE (rhs) == TEMPLATE_ID_EXPR); |
05e0b2f4 | 6330 | |
2a238a97 | 6331 | /* Fall through. */ |
874503bc | 6332 | |
386b8a85 | 6333 | case TEMPLATE_ID_EXPR: |
2bdb0643 JM |
6334 | { |
6335 | tree fns = TREE_OPERAND (rhs, 0); | |
6336 | tree args = TREE_OPERAND (rhs, 1); | |
6337 | ||
19420d00 | 6338 | return |
92af500d NS |
6339 | resolve_address_of_overloaded_function (lhstype, fns, flags_in, |
6340 | /*template_only=*/true, | |
eff3a276 | 6341 | args, access_path); |
2bdb0643 | 6342 | } |
386b8a85 | 6343 | |
2c73f9f5 | 6344 | case OVERLOAD: |
a723baf1 | 6345 | case FUNCTION_DECL: |
c8094d83 | 6346 | return |
92af500d NS |
6347 | resolve_address_of_overloaded_function (lhstype, rhs, flags_in, |
6348 | /*template_only=*/false, | |
eff3a276 MM |
6349 | /*explicit_targs=*/NULL_TREE, |
6350 | access_path); | |
2c73f9f5 | 6351 | |
8d08fdba | 6352 | case COMPOUND_EXPR: |
a0a33927 | 6353 | TREE_OPERAND (rhs, 0) |
940ff223 | 6354 | = instantiate_type (lhstype, TREE_OPERAND (rhs, 0), flags); |
8d08fdba MS |
6355 | if (TREE_OPERAND (rhs, 0) == error_mark_node) |
6356 | return error_mark_node; | |
a0a33927 | 6357 | TREE_OPERAND (rhs, 1) |
940ff223 | 6358 | = instantiate_type (lhstype, TREE_OPERAND (rhs, 1), flags); |
8d08fdba MS |
6359 | if (TREE_OPERAND (rhs, 1) == error_mark_node) |
6360 | return error_mark_node; | |
6361 | ||
6362 | TREE_TYPE (rhs) = lhstype; | |
6363 | return rhs; | |
6364 | ||
ca36f057 | 6365 | case ADDR_EXPR: |
19420d00 NS |
6366 | { |
6367 | if (PTRMEM_OK_P (rhs)) | |
0cbd7506 | 6368 | flags |= tf_ptrmem_ok; |
c8094d83 | 6369 | |
ca36f057 | 6370 | return instantiate_type (lhstype, TREE_OPERAND (rhs, 0), flags); |
19420d00 | 6371 | } |
ca36f057 MM |
6372 | |
6373 | case ERROR_MARK: | |
6374 | return error_mark_node; | |
6375 | ||
6376 | default: | |
8dc2b103 | 6377 | gcc_unreachable (); |
ca36f057 | 6378 | } |
8dc2b103 | 6379 | return error_mark_node; |
ca36f057 MM |
6380 | } |
6381 | \f | |
6382 | /* Return the name of the virtual function pointer field | |
6383 | (as an IDENTIFIER_NODE) for the given TYPE. Note that | |
6384 | this may have to look back through base types to find the | |
6385 | ultimate field name. (For single inheritance, these could | |
6386 | all be the same name. Who knows for multiple inheritance). */ | |
6387 | ||
6388 | static tree | |
94edc4ab | 6389 | get_vfield_name (tree type) |
ca36f057 | 6390 | { |
37a247a0 | 6391 | tree binfo, base_binfo; |
ca36f057 MM |
6392 | char *buf; |
6393 | ||
37a247a0 | 6394 | for (binfo = TYPE_BINFO (type); |
fa743e8c | 6395 | BINFO_N_BASE_BINFOS (binfo); |
37a247a0 NS |
6396 | binfo = base_binfo) |
6397 | { | |
6398 | base_binfo = BINFO_BASE_BINFO (binfo, 0); | |
ca36f057 | 6399 | |
37a247a0 NS |
6400 | if (BINFO_VIRTUAL_P (base_binfo) |
6401 | || !TYPE_CONTAINS_VPTR_P (BINFO_TYPE (base_binfo))) | |
6402 | break; | |
6403 | } | |
c8094d83 | 6404 | |
ca36f057 | 6405 | type = BINFO_TYPE (binfo); |
67f5655f | 6406 | buf = (char *) alloca (sizeof (VFIELD_NAME_FORMAT) |
3db45ab5 | 6407 | + TYPE_NAME_LENGTH (type) + 2); |
ea122333 JM |
6408 | sprintf (buf, VFIELD_NAME_FORMAT, |
6409 | IDENTIFIER_POINTER (constructor_name (type))); | |
ca36f057 MM |
6410 | return get_identifier (buf); |
6411 | } | |
6412 | ||
6413 | void | |
94edc4ab | 6414 | print_class_statistics (void) |
ca36f057 MM |
6415 | { |
6416 | #ifdef GATHER_STATISTICS | |
6417 | fprintf (stderr, "convert_harshness = %d\n", n_convert_harshness); | |
6418 | fprintf (stderr, "compute_conversion_costs = %d\n", n_compute_conversion_costs); | |
ca36f057 MM |
6419 | if (n_vtables) |
6420 | { | |
6421 | fprintf (stderr, "vtables = %d; vtable searches = %d\n", | |
6422 | n_vtables, n_vtable_searches); | |
6423 | fprintf (stderr, "vtable entries = %d; vtable elems = %d\n", | |
6424 | n_vtable_entries, n_vtable_elems); | |
6425 | } | |
6426 | #endif | |
6427 | } | |
6428 | ||
6429 | /* Build a dummy reference to ourselves so Derived::Base (and A::A) works, | |
6430 | according to [class]: | |
0cbd7506 | 6431 | The class-name is also inserted |
ca36f057 MM |
6432 | into the scope of the class itself. For purposes of access checking, |
6433 | the inserted class name is treated as if it were a public member name. */ | |
6434 | ||
6435 | void | |
94edc4ab | 6436 | build_self_reference (void) |
ca36f057 MM |
6437 | { |
6438 | tree name = constructor_name (current_class_type); | |
6439 | tree value = build_lang_decl (TYPE_DECL, name, current_class_type); | |
6440 | tree saved_cas; | |
6441 | ||
6442 | DECL_NONLOCAL (value) = 1; | |
6443 | DECL_CONTEXT (value) = current_class_type; | |
6444 | DECL_ARTIFICIAL (value) = 1; | |
a3d87771 | 6445 | SET_DECL_SELF_REFERENCE_P (value); |
ca36f057 MM |
6446 | |
6447 | if (processing_template_decl) | |
6448 | value = push_template_decl (value); | |
6449 | ||
6450 | saved_cas = current_access_specifier; | |
6451 | current_access_specifier = access_public_node; | |
6452 | finish_member_declaration (value); | |
6453 | current_access_specifier = saved_cas; | |
6454 | } | |
6455 | ||
6456 | /* Returns 1 if TYPE contains only padding bytes. */ | |
6457 | ||
6458 | int | |
94edc4ab | 6459 | is_empty_class (tree type) |
ca36f057 | 6460 | { |
ca36f057 MM |
6461 | if (type == error_mark_node) |
6462 | return 0; | |
6463 | ||
2588c9e9 | 6464 | if (! CLASS_TYPE_P (type)) |
ca36f057 MM |
6465 | return 0; |
6466 | ||
58731fd1 MM |
6467 | /* In G++ 3.2, whether or not a class was empty was determined by |
6468 | looking at its size. */ | |
6469 | if (abi_version_at_least (2)) | |
6470 | return CLASSTYPE_EMPTY_P (type); | |
6471 | else | |
6472 | return integer_zerop (CLASSTYPE_SIZE (type)); | |
ca36f057 MM |
6473 | } |
6474 | ||
956d9305 MM |
6475 | /* Returns true if TYPE contains an empty class. */ |
6476 | ||
6477 | static bool | |
6478 | contains_empty_class_p (tree type) | |
6479 | { | |
6480 | if (is_empty_class (type)) | |
6481 | return true; | |
6482 | if (CLASS_TYPE_P (type)) | |
6483 | { | |
6484 | tree field; | |
fa743e8c NS |
6485 | tree binfo; |
6486 | tree base_binfo; | |
956d9305 MM |
6487 | int i; |
6488 | ||
fa743e8c NS |
6489 | for (binfo = TYPE_BINFO (type), i = 0; |
6490 | BINFO_BASE_ITERATE (binfo, i, base_binfo); ++i) | |
6491 | if (contains_empty_class_p (BINFO_TYPE (base_binfo))) | |
956d9305 MM |
6492 | return true; |
6493 | for (field = TYPE_FIELDS (type); field; field = TREE_CHAIN (field)) | |
17bbb839 MM |
6494 | if (TREE_CODE (field) == FIELD_DECL |
6495 | && !DECL_ARTIFICIAL (field) | |
6496 | && is_empty_class (TREE_TYPE (field))) | |
956d9305 MM |
6497 | return true; |
6498 | } | |
6499 | else if (TREE_CODE (type) == ARRAY_TYPE) | |
6500 | return contains_empty_class_p (TREE_TYPE (type)); | |
6501 | return false; | |
6502 | } | |
6503 | ||
2588c9e9 JM |
6504 | /* Returns true if TYPE contains no actual data, just various |
6505 | possible combinations of empty classes. */ | |
6506 | ||
6507 | bool | |
6508 | is_really_empty_class (tree type) | |
6509 | { | |
6510 | if (is_empty_class (type)) | |
6511 | return true; | |
6512 | if (CLASS_TYPE_P (type)) | |
6513 | { | |
6514 | tree field; | |
6515 | tree binfo; | |
6516 | tree base_binfo; | |
6517 | int i; | |
6518 | ||
6519 | for (binfo = TYPE_BINFO (type), i = 0; | |
6520 | BINFO_BASE_ITERATE (binfo, i, base_binfo); ++i) | |
6521 | if (!is_really_empty_class (BINFO_TYPE (base_binfo))) | |
6522 | return false; | |
6523 | for (field = TYPE_FIELDS (type); field; field = TREE_CHAIN (field)) | |
6524 | if (TREE_CODE (field) == FIELD_DECL | |
6525 | && !DECL_ARTIFICIAL (field) | |
6526 | && !is_really_empty_class (TREE_TYPE (field))) | |
6527 | return false; | |
6528 | return true; | |
6529 | } | |
6530 | else if (TREE_CODE (type) == ARRAY_TYPE) | |
6531 | return is_really_empty_class (TREE_TYPE (type)); | |
6532 | return false; | |
6533 | } | |
6534 | ||
ca36f057 MM |
6535 | /* Note that NAME was looked up while the current class was being |
6536 | defined and that the result of that lookup was DECL. */ | |
6537 | ||
6538 | void | |
94edc4ab | 6539 | maybe_note_name_used_in_class (tree name, tree decl) |
ca36f057 MM |
6540 | { |
6541 | splay_tree names_used; | |
6542 | ||
6543 | /* If we're not defining a class, there's nothing to do. */ | |
39fb05d0 MM |
6544 | if (!(innermost_scope_kind() == sk_class |
6545 | && TYPE_BEING_DEFINED (current_class_type))) | |
ca36f057 | 6546 | return; |
c8094d83 | 6547 | |
ca36f057 MM |
6548 | /* If there's already a binding for this NAME, then we don't have |
6549 | anything to worry about. */ | |
c8094d83 | 6550 | if (lookup_member (current_class_type, name, |
39fb05d0 | 6551 | /*protect=*/0, /*want_type=*/false)) |
ca36f057 MM |
6552 | return; |
6553 | ||
6554 | if (!current_class_stack[current_class_depth - 1].names_used) | |
6555 | current_class_stack[current_class_depth - 1].names_used | |
6556 | = splay_tree_new (splay_tree_compare_pointers, 0, 0); | |
6557 | names_used = current_class_stack[current_class_depth - 1].names_used; | |
6558 | ||
6559 | splay_tree_insert (names_used, | |
c8094d83 | 6560 | (splay_tree_key) name, |
ca36f057 MM |
6561 | (splay_tree_value) decl); |
6562 | } | |
6563 | ||
6564 | /* Note that NAME was declared (as DECL) in the current class. Check | |
0e339752 | 6565 | to see that the declaration is valid. */ |
ca36f057 MM |
6566 | |
6567 | void | |
94edc4ab | 6568 | note_name_declared_in_class (tree name, tree decl) |
ca36f057 MM |
6569 | { |
6570 | splay_tree names_used; | |
6571 | splay_tree_node n; | |
6572 | ||
6573 | /* Look to see if we ever used this name. */ | |
c8094d83 | 6574 | names_used |
ca36f057 MM |
6575 | = current_class_stack[current_class_depth - 1].names_used; |
6576 | if (!names_used) | |
6577 | return; | |
6578 | ||
6579 | n = splay_tree_lookup (names_used, (splay_tree_key) name); | |
6580 | if (n) | |
6581 | { | |
6582 | /* [basic.scope.class] | |
c8094d83 | 6583 | |
ca36f057 MM |
6584 | A name N used in a class S shall refer to the same declaration |
6585 | in its context and when re-evaluated in the completed scope of | |
6586 | S. */ | |
cbe5f3b3 MLI |
6587 | permerror (input_location, "declaration of %q#D", decl); |
6588 | permerror (input_location, "changes meaning of %qD from %q+#D", | |
2ae2031e | 6589 | DECL_NAME (OVL_CURRENT (decl)), (tree) n->value); |
ca36f057 MM |
6590 | } |
6591 | } | |
6592 | ||
3461fba7 NS |
6593 | /* Returns the VAR_DECL for the complete vtable associated with BINFO. |
6594 | Secondary vtables are merged with primary vtables; this function | |
6595 | will return the VAR_DECL for the primary vtable. */ | |
ca36f057 | 6596 | |
c35cce41 | 6597 | tree |
94edc4ab | 6598 | get_vtbl_decl_for_binfo (tree binfo) |
c35cce41 MM |
6599 | { |
6600 | tree decl; | |
6601 | ||
6602 | decl = BINFO_VTABLE (binfo); | |
5be014d5 | 6603 | if (decl && TREE_CODE (decl) == POINTER_PLUS_EXPR) |
c35cce41 | 6604 | { |
50bc768d | 6605 | gcc_assert (TREE_CODE (TREE_OPERAND (decl, 0)) == ADDR_EXPR); |
c35cce41 MM |
6606 | decl = TREE_OPERAND (TREE_OPERAND (decl, 0), 0); |
6607 | } | |
6608 | if (decl) | |
50bc768d | 6609 | gcc_assert (TREE_CODE (decl) == VAR_DECL); |
c35cce41 MM |
6610 | return decl; |
6611 | } | |
6612 | ||
911a71a7 | 6613 | |
dbbf88d1 NS |
6614 | /* Returns the binfo for the primary base of BINFO. If the resulting |
6615 | BINFO is a virtual base, and it is inherited elsewhere in the | |
6616 | hierarchy, then the returned binfo might not be the primary base of | |
6617 | BINFO in the complete object. Check BINFO_PRIMARY_P or | |
6618 | BINFO_LOST_PRIMARY_P to be sure. */ | |
911a71a7 | 6619 | |
b5791fdc | 6620 | static tree |
94edc4ab | 6621 | get_primary_binfo (tree binfo) |
911a71a7 MM |
6622 | { |
6623 | tree primary_base; | |
c8094d83 | 6624 | |
911a71a7 MM |
6625 | primary_base = CLASSTYPE_PRIMARY_BINFO (BINFO_TYPE (binfo)); |
6626 | if (!primary_base) | |
6627 | return NULL_TREE; | |
6628 | ||
b5791fdc | 6629 | return copied_binfo (primary_base, binfo); |
911a71a7 MM |
6630 | } |
6631 | ||
838dfd8a | 6632 | /* If INDENTED_P is zero, indent to INDENT. Return nonzero. */ |
b7442fb5 NS |
6633 | |
6634 | static int | |
94edc4ab | 6635 | maybe_indent_hierarchy (FILE * stream, int indent, int indented_p) |
b7442fb5 NS |
6636 | { |
6637 | if (!indented_p) | |
6638 | fprintf (stream, "%*s", indent, ""); | |
6639 | return 1; | |
6640 | } | |
6641 | ||
dbbf88d1 NS |
6642 | /* Dump the offsets of all the bases rooted at BINFO to STREAM. |
6643 | INDENT should be zero when called from the top level; it is | |
6644 | incremented recursively. IGO indicates the next expected BINFO in | |
9bcb9aae | 6645 | inheritance graph ordering. */ |
c35cce41 | 6646 | |
dbbf88d1 NS |
6647 | static tree |
6648 | dump_class_hierarchy_r (FILE *stream, | |
0cbd7506 MS |
6649 | int flags, |
6650 | tree binfo, | |
6651 | tree igo, | |
6652 | int indent) | |
ca36f057 | 6653 | { |
b7442fb5 | 6654 | int indented = 0; |
fa743e8c NS |
6655 | tree base_binfo; |
6656 | int i; | |
c8094d83 | 6657 | |
b7442fb5 NS |
6658 | indented = maybe_indent_hierarchy (stream, indent, 0); |
6659 | fprintf (stream, "%s (0x%lx) ", | |
fc6633e0 | 6660 | type_as_string (BINFO_TYPE (binfo), TFF_PLAIN_IDENTIFIER), |
b7442fb5 | 6661 | (unsigned long) binfo); |
dbbf88d1 NS |
6662 | if (binfo != igo) |
6663 | { | |
6664 | fprintf (stream, "alternative-path\n"); | |
6665 | return igo; | |
6666 | } | |
6667 | igo = TREE_CHAIN (binfo); | |
c8094d83 | 6668 | |
9965d119 | 6669 | fprintf (stream, HOST_WIDE_INT_PRINT_DEC, |
ca36f057 | 6670 | tree_low_cst (BINFO_OFFSET (binfo), 0)); |
9965d119 NS |
6671 | if (is_empty_class (BINFO_TYPE (binfo))) |
6672 | fprintf (stream, " empty"); | |
6673 | else if (CLASSTYPE_NEARLY_EMPTY_P (BINFO_TYPE (binfo))) | |
6674 | fprintf (stream, " nearly-empty"); | |
809e3e7f | 6675 | if (BINFO_VIRTUAL_P (binfo)) |
dbbf88d1 | 6676 | fprintf (stream, " virtual"); |
9965d119 | 6677 | fprintf (stream, "\n"); |
ca36f057 | 6678 | |
b7442fb5 | 6679 | indented = 0; |
fc6633e0 | 6680 | if (BINFO_PRIMARY_P (binfo)) |
b7442fb5 NS |
6681 | { |
6682 | indented = maybe_indent_hierarchy (stream, indent + 3, indented); | |
6683 | fprintf (stream, " primary-for %s (0x%lx)", | |
fc6633e0 | 6684 | type_as_string (BINFO_TYPE (BINFO_INHERITANCE_CHAIN (binfo)), |
b7442fb5 | 6685 | TFF_PLAIN_IDENTIFIER), |
fc6633e0 | 6686 | (unsigned long)BINFO_INHERITANCE_CHAIN (binfo)); |
b7442fb5 NS |
6687 | } |
6688 | if (BINFO_LOST_PRIMARY_P (binfo)) | |
6689 | { | |
6690 | indented = maybe_indent_hierarchy (stream, indent + 3, indented); | |
6691 | fprintf (stream, " lost-primary"); | |
6692 | } | |
6693 | if (indented) | |
6694 | fprintf (stream, "\n"); | |
6695 | ||
6696 | if (!(flags & TDF_SLIM)) | |
6697 | { | |
6698 | int indented = 0; | |
c8094d83 | 6699 | |
b7442fb5 NS |
6700 | if (BINFO_SUBVTT_INDEX (binfo)) |
6701 | { | |
6702 | indented = maybe_indent_hierarchy (stream, indent + 3, indented); | |
6703 | fprintf (stream, " subvttidx=%s", | |
6704 | expr_as_string (BINFO_SUBVTT_INDEX (binfo), | |
6705 | TFF_PLAIN_IDENTIFIER)); | |
6706 | } | |
6707 | if (BINFO_VPTR_INDEX (binfo)) | |
6708 | { | |
6709 | indented = maybe_indent_hierarchy (stream, indent + 3, indented); | |
6710 | fprintf (stream, " vptridx=%s", | |
6711 | expr_as_string (BINFO_VPTR_INDEX (binfo), | |
6712 | TFF_PLAIN_IDENTIFIER)); | |
6713 | } | |
6714 | if (BINFO_VPTR_FIELD (binfo)) | |
6715 | { | |
6716 | indented = maybe_indent_hierarchy (stream, indent + 3, indented); | |
6717 | fprintf (stream, " vbaseoffset=%s", | |
6718 | expr_as_string (BINFO_VPTR_FIELD (binfo), | |
6719 | TFF_PLAIN_IDENTIFIER)); | |
6720 | } | |
6721 | if (BINFO_VTABLE (binfo)) | |
6722 | { | |
6723 | indented = maybe_indent_hierarchy (stream, indent + 3, indented); | |
6724 | fprintf (stream, " vptr=%s", | |
6725 | expr_as_string (BINFO_VTABLE (binfo), | |
6726 | TFF_PLAIN_IDENTIFIER)); | |
6727 | } | |
c8094d83 | 6728 | |
b7442fb5 NS |
6729 | if (indented) |
6730 | fprintf (stream, "\n"); | |
6731 | } | |
dbbf88d1 | 6732 | |
fa743e8c NS |
6733 | for (i = 0; BINFO_BASE_ITERATE (binfo, i, base_binfo); i++) |
6734 | igo = dump_class_hierarchy_r (stream, flags, base_binfo, igo, indent + 2); | |
c8094d83 | 6735 | |
dbbf88d1 | 6736 | return igo; |
c35cce41 MM |
6737 | } |
6738 | ||
6739 | /* Dump the BINFO hierarchy for T. */ | |
6740 | ||
b7442fb5 | 6741 | static void |
bb885938 | 6742 | dump_class_hierarchy_1 (FILE *stream, int flags, tree t) |
c35cce41 | 6743 | { |
b7442fb5 NS |
6744 | fprintf (stream, "Class %s\n", type_as_string (t, TFF_PLAIN_IDENTIFIER)); |
6745 | fprintf (stream, " size=%lu align=%lu\n", | |
6746 | (unsigned long)(tree_low_cst (TYPE_SIZE (t), 0) / BITS_PER_UNIT), | |
6747 | (unsigned long)(TYPE_ALIGN (t) / BITS_PER_UNIT)); | |
dbbf88d1 NS |
6748 | fprintf (stream, " base size=%lu base align=%lu\n", |
6749 | (unsigned long)(tree_low_cst (TYPE_SIZE (CLASSTYPE_AS_BASE (t)), 0) | |
6750 | / BITS_PER_UNIT), | |
6751 | (unsigned long)(TYPE_ALIGN (CLASSTYPE_AS_BASE (t)) | |
6752 | / BITS_PER_UNIT)); | |
6753 | dump_class_hierarchy_r (stream, flags, TYPE_BINFO (t), TYPE_BINFO (t), 0); | |
b7442fb5 | 6754 | fprintf (stream, "\n"); |
bb885938 NS |
6755 | } |
6756 | ||
da1d7781 | 6757 | /* Debug interface to hierarchy dumping. */ |
bb885938 | 6758 | |
ac1f3b7e | 6759 | void |
bb885938 NS |
6760 | debug_class (tree t) |
6761 | { | |
6762 | dump_class_hierarchy_1 (stderr, TDF_SLIM, t); | |
6763 | } | |
6764 | ||
6765 | static void | |
6766 | dump_class_hierarchy (tree t) | |
6767 | { | |
6768 | int flags; | |
6769 | FILE *stream = dump_begin (TDI_class, &flags); | |
6770 | ||
6771 | if (stream) | |
6772 | { | |
6773 | dump_class_hierarchy_1 (stream, flags, t); | |
6774 | dump_end (TDI_class, stream); | |
6775 | } | |
b7442fb5 NS |
6776 | } |
6777 | ||
6778 | static void | |
94edc4ab | 6779 | dump_array (FILE * stream, tree decl) |
b7442fb5 | 6780 | { |
4038c495 GB |
6781 | tree value; |
6782 | unsigned HOST_WIDE_INT ix; | |
b7442fb5 NS |
6783 | HOST_WIDE_INT elt; |
6784 | tree size = TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (decl))); | |
6785 | ||
6786 | elt = (tree_low_cst (TYPE_SIZE (TREE_TYPE (TREE_TYPE (decl))), 0) | |
6787 | / BITS_PER_UNIT); | |
6788 | fprintf (stream, "%s:", decl_as_string (decl, TFF_PLAIN_IDENTIFIER)); | |
6789 | fprintf (stream, " %s entries", | |
6790 | expr_as_string (size_binop (PLUS_EXPR, size, size_one_node), | |
6791 | TFF_PLAIN_IDENTIFIER)); | |
6792 | fprintf (stream, "\n"); | |
6793 | ||
4038c495 GB |
6794 | FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (DECL_INITIAL (decl)), |
6795 | ix, value) | |
4fdc14ca | 6796 | fprintf (stream, "%-4ld %s\n", (long)(ix * elt), |
4038c495 | 6797 | expr_as_string (value, TFF_PLAIN_IDENTIFIER)); |
b7442fb5 NS |
6798 | } |
6799 | ||
6800 | static void | |
94edc4ab | 6801 | dump_vtable (tree t, tree binfo, tree vtable) |
b7442fb5 NS |
6802 | { |
6803 | int flags; | |
6804 | FILE *stream = dump_begin (TDI_class, &flags); | |
6805 | ||
6806 | if (!stream) | |
6807 | return; | |
6808 | ||
6809 | if (!(flags & TDF_SLIM)) | |
9965d119 | 6810 | { |
b7442fb5 | 6811 | int ctor_vtbl_p = TYPE_BINFO (t) != binfo; |
c8094d83 | 6812 | |
b7442fb5 NS |
6813 | fprintf (stream, "%s for %s", |
6814 | ctor_vtbl_p ? "Construction vtable" : "Vtable", | |
fc6633e0 | 6815 | type_as_string (BINFO_TYPE (binfo), TFF_PLAIN_IDENTIFIER)); |
b7442fb5 NS |
6816 | if (ctor_vtbl_p) |
6817 | { | |
809e3e7f | 6818 | if (!BINFO_VIRTUAL_P (binfo)) |
b7442fb5 NS |
6819 | fprintf (stream, " (0x%lx instance)", (unsigned long)binfo); |
6820 | fprintf (stream, " in %s", type_as_string (t, TFF_PLAIN_IDENTIFIER)); | |
6821 | } | |
6822 | fprintf (stream, "\n"); | |
6823 | dump_array (stream, vtable); | |
6824 | fprintf (stream, "\n"); | |
9965d119 | 6825 | } |
c8094d83 | 6826 | |
b7442fb5 NS |
6827 | dump_end (TDI_class, stream); |
6828 | } | |
6829 | ||
6830 | static void | |
94edc4ab | 6831 | dump_vtt (tree t, tree vtt) |
b7442fb5 NS |
6832 | { |
6833 | int flags; | |
6834 | FILE *stream = dump_begin (TDI_class, &flags); | |
6835 | ||
6836 | if (!stream) | |
6837 | return; | |
6838 | ||
6839 | if (!(flags & TDF_SLIM)) | |
6840 | { | |
6841 | fprintf (stream, "VTT for %s\n", | |
6842 | type_as_string (t, TFF_PLAIN_IDENTIFIER)); | |
6843 | dump_array (stream, vtt); | |
6844 | fprintf (stream, "\n"); | |
6845 | } | |
c8094d83 | 6846 | |
b7442fb5 | 6847 | dump_end (TDI_class, stream); |
ca36f057 MM |
6848 | } |
6849 | ||
bb885938 NS |
6850 | /* Dump a function or thunk and its thunkees. */ |
6851 | ||
6852 | static void | |
6853 | dump_thunk (FILE *stream, int indent, tree thunk) | |
6854 | { | |
6855 | static const char spaces[] = " "; | |
6856 | tree name = DECL_NAME (thunk); | |
6857 | tree thunks; | |
c8094d83 | 6858 | |
bb885938 NS |
6859 | fprintf (stream, "%.*s%p %s %s", indent, spaces, |
6860 | (void *)thunk, | |
6861 | !DECL_THUNK_P (thunk) ? "function" | |
6862 | : DECL_THIS_THUNK_P (thunk) ? "this-thunk" : "covariant-thunk", | |
6863 | name ? IDENTIFIER_POINTER (name) : "<unset>"); | |
e00853fd | 6864 | if (DECL_THUNK_P (thunk)) |
bb885938 NS |
6865 | { |
6866 | HOST_WIDE_INT fixed_adjust = THUNK_FIXED_OFFSET (thunk); | |
6867 | tree virtual_adjust = THUNK_VIRTUAL_OFFSET (thunk); | |
6868 | ||
6869 | fprintf (stream, " fixed=" HOST_WIDE_INT_PRINT_DEC, fixed_adjust); | |
6870 | if (!virtual_adjust) | |
6871 | /*NOP*/; | |
6872 | else if (DECL_THIS_THUNK_P (thunk)) | |
6873 | fprintf (stream, " vcall=" HOST_WIDE_INT_PRINT_DEC, | |
6874 | tree_low_cst (virtual_adjust, 0)); | |
6875 | else | |
6876 | fprintf (stream, " vbase=" HOST_WIDE_INT_PRINT_DEC "(%s)", | |
6877 | tree_low_cst (BINFO_VPTR_FIELD (virtual_adjust), 0), | |
6878 | type_as_string (BINFO_TYPE (virtual_adjust), TFF_SCOPE)); | |
e00853fd NS |
6879 | if (THUNK_ALIAS (thunk)) |
6880 | fprintf (stream, " alias to %p", (void *)THUNK_ALIAS (thunk)); | |
bb885938 NS |
6881 | } |
6882 | fprintf (stream, "\n"); | |
6883 | for (thunks = DECL_THUNKS (thunk); thunks; thunks = TREE_CHAIN (thunks)) | |
6884 | dump_thunk (stream, indent + 2, thunks); | |
6885 | } | |
6886 | ||
6887 | /* Dump the thunks for FN. */ | |
6888 | ||
ac1f3b7e | 6889 | void |
bb885938 NS |
6890 | debug_thunks (tree fn) |
6891 | { | |
6892 | dump_thunk (stderr, 0, fn); | |
6893 | } | |
6894 | ||
ca36f057 MM |
6895 | /* Virtual function table initialization. */ |
6896 | ||
6897 | /* Create all the necessary vtables for T and its base classes. */ | |
6898 | ||
6899 | static void | |
94edc4ab | 6900 | finish_vtbls (tree t) |
ca36f057 | 6901 | { |
3461fba7 NS |
6902 | tree list; |
6903 | tree vbase; | |
ca36f057 | 6904 | |
3461fba7 NS |
6905 | /* We lay out the primary and secondary vtables in one contiguous |
6906 | vtable. The primary vtable is first, followed by the non-virtual | |
6907 | secondary vtables in inheritance graph order. */ | |
604a3205 | 6908 | list = build_tree_list (BINFO_VTABLE (TYPE_BINFO (t)), NULL_TREE); |
3461fba7 NS |
6909 | accumulate_vtbl_inits (TYPE_BINFO (t), TYPE_BINFO (t), |
6910 | TYPE_BINFO (t), t, list); | |
c8094d83 | 6911 | |
3461fba7 NS |
6912 | /* Then come the virtual bases, also in inheritance graph order. */ |
6913 | for (vbase = TYPE_BINFO (t); vbase; vbase = TREE_CHAIN (vbase)) | |
6914 | { | |
809e3e7f | 6915 | if (!BINFO_VIRTUAL_P (vbase)) |
3461fba7 | 6916 | continue; |
dbbf88d1 | 6917 | accumulate_vtbl_inits (vbase, vbase, TYPE_BINFO (t), t, list); |
ff668506 JM |
6918 | } |
6919 | ||
604a3205 | 6920 | if (BINFO_VTABLE (TYPE_BINFO (t))) |
3461fba7 | 6921 | initialize_vtable (TYPE_BINFO (t), TREE_VALUE (list)); |
ca36f057 MM |
6922 | } |
6923 | ||
6924 | /* Initialize the vtable for BINFO with the INITS. */ | |
6925 | ||
6926 | static void | |
94edc4ab | 6927 | initialize_vtable (tree binfo, tree inits) |
ca36f057 | 6928 | { |
ca36f057 MM |
6929 | tree decl; |
6930 | ||
6931 | layout_vtable_decl (binfo, list_length (inits)); | |
c35cce41 | 6932 | decl = get_vtbl_decl_for_binfo (binfo); |
19c29b2f | 6933 | initialize_artificial_var (decl, inits); |
b7442fb5 | 6934 | dump_vtable (BINFO_TYPE (binfo), binfo, decl); |
23656158 MM |
6935 | } |
6936 | ||
9965d119 NS |
6937 | /* Build the VTT (virtual table table) for T. |
6938 | A class requires a VTT if it has virtual bases. | |
c8094d83 | 6939 | |
9965d119 NS |
6940 | This holds |
6941 | 1 - primary virtual pointer for complete object T | |
90ecce3e JM |
6942 | 2 - secondary VTTs for each direct non-virtual base of T which requires a |
6943 | VTT | |
9965d119 NS |
6944 | 3 - secondary virtual pointers for each direct or indirect base of T which |
6945 | has virtual bases or is reachable via a virtual path from T. | |
6946 | 4 - secondary VTTs for each direct or indirect virtual base of T. | |
c8094d83 | 6947 | |
9965d119 | 6948 | Secondary VTTs look like complete object VTTs without part 4. */ |
23656158 MM |
6949 | |
6950 | static void | |
94edc4ab | 6951 | build_vtt (tree t) |
23656158 MM |
6952 | { |
6953 | tree inits; | |
6954 | tree type; | |
6955 | tree vtt; | |
3ec6bad3 | 6956 | tree index; |
23656158 | 6957 | |
23656158 MM |
6958 | /* Build up the initializers for the VTT. */ |
6959 | inits = NULL_TREE; | |
3ec6bad3 | 6960 | index = size_zero_node; |
9965d119 | 6961 | build_vtt_inits (TYPE_BINFO (t), t, &inits, &index); |
23656158 MM |
6962 | |
6963 | /* If we didn't need a VTT, we're done. */ | |
6964 | if (!inits) | |
6965 | return; | |
6966 | ||
6967 | /* Figure out the type of the VTT. */ | |
442e01b6 | 6968 | type = build_index_type (size_int (list_length (inits) - 1)); |
23656158 | 6969 | type = build_cplus_array_type (const_ptr_type_node, type); |
c8094d83 | 6970 | |
23656158 | 6971 | /* Now, build the VTT object itself. */ |
3e355d92 | 6972 | vtt = build_vtable (t, mangle_vtt_for_type (t), type); |
19c29b2f | 6973 | initialize_artificial_var (vtt, inits); |
548502d3 MM |
6974 | /* Add the VTT to the vtables list. */ |
6975 | TREE_CHAIN (vtt) = TREE_CHAIN (CLASSTYPE_VTABLES (t)); | |
6976 | TREE_CHAIN (CLASSTYPE_VTABLES (t)) = vtt; | |
b7442fb5 NS |
6977 | |
6978 | dump_vtt (t, vtt); | |
23656158 MM |
6979 | } |
6980 | ||
13de7ec4 JM |
6981 | /* When building a secondary VTT, BINFO_VTABLE is set to a TREE_LIST with |
6982 | PURPOSE the RTTI_BINFO, VALUE the real vtable pointer for this binfo, | |
6983 | and CHAIN the vtable pointer for this binfo after construction is | |
00a17e31 | 6984 | complete. VALUE can also be another BINFO, in which case we recurse. */ |
13de7ec4 JM |
6985 | |
6986 | static tree | |
94edc4ab | 6987 | binfo_ctor_vtable (tree binfo) |
13de7ec4 JM |
6988 | { |
6989 | tree vt; | |
6990 | ||
6991 | while (1) | |
6992 | { | |
6993 | vt = BINFO_VTABLE (binfo); | |
6994 | if (TREE_CODE (vt) == TREE_LIST) | |
6995 | vt = TREE_VALUE (vt); | |
95b4aca6 | 6996 | if (TREE_CODE (vt) == TREE_BINFO) |
13de7ec4 JM |
6997 | binfo = vt; |
6998 | else | |
6999 | break; | |
7000 | } | |
7001 | ||
7002 | return vt; | |
7003 | } | |
7004 | ||
a3a0fc7f NS |
7005 | /* Data for secondary VTT initialization. */ |
7006 | typedef struct secondary_vptr_vtt_init_data_s | |
7007 | { | |
7008 | /* Is this the primary VTT? */ | |
7009 | bool top_level_p; | |
7010 | ||
7011 | /* Current index into the VTT. */ | |
7012 | tree index; | |
7013 | ||
7014 | /* TREE_LIST of initializers built up. */ | |
7015 | tree inits; | |
7016 | ||
7017 | /* The type being constructed by this secondary VTT. */ | |
7018 | tree type_being_constructed; | |
7019 | } secondary_vptr_vtt_init_data; | |
7020 | ||
23656158 | 7021 | /* Recursively build the VTT-initializer for BINFO (which is in the |
9965d119 NS |
7022 | hierarchy dominated by T). INITS points to the end of the initializer |
7023 | list to date. INDEX is the VTT index where the next element will be | |
7024 | replaced. Iff BINFO is the binfo for T, this is the top level VTT (i.e. | |
7025 | not a subvtt for some base of T). When that is so, we emit the sub-VTTs | |
7026 | for virtual bases of T. When it is not so, we build the constructor | |
7027 | vtables for the BINFO-in-T variant. */ | |
23656158 MM |
7028 | |
7029 | static tree * | |
a3a0fc7f | 7030 | build_vtt_inits (tree binfo, tree t, tree *inits, tree *index) |
23656158 MM |
7031 | { |
7032 | int i; | |
7033 | tree b; | |
7034 | tree init; | |
7035 | tree secondary_vptrs; | |
a3a0fc7f | 7036 | secondary_vptr_vtt_init_data data; |
539ed333 | 7037 | int top_level_p = SAME_BINFO_TYPE_P (BINFO_TYPE (binfo), t); |
23656158 MM |
7038 | |
7039 | /* We only need VTTs for subobjects with virtual bases. */ | |
5775a06a | 7040 | if (!CLASSTYPE_VBASECLASSES (BINFO_TYPE (binfo))) |
23656158 MM |
7041 | return inits; |
7042 | ||
7043 | /* We need to use a construction vtable if this is not the primary | |
7044 | VTT. */ | |
9965d119 | 7045 | if (!top_level_p) |
3ec6bad3 MM |
7046 | { |
7047 | build_ctor_vtbl_group (binfo, t); | |
7048 | ||
7049 | /* Record the offset in the VTT where this sub-VTT can be found. */ | |
7050 | BINFO_SUBVTT_INDEX (binfo) = *index; | |
7051 | } | |
23656158 MM |
7052 | |
7053 | /* Add the address of the primary vtable for the complete object. */ | |
13de7ec4 | 7054 | init = binfo_ctor_vtable (binfo); |
23656158 MM |
7055 | *inits = build_tree_list (NULL_TREE, init); |
7056 | inits = &TREE_CHAIN (*inits); | |
9965d119 NS |
7057 | if (top_level_p) |
7058 | { | |
50bc768d | 7059 | gcc_assert (!BINFO_VPTR_INDEX (binfo)); |
9965d119 NS |
7060 | BINFO_VPTR_INDEX (binfo) = *index; |
7061 | } | |
3ec6bad3 | 7062 | *index = size_binop (PLUS_EXPR, *index, TYPE_SIZE_UNIT (ptr_type_node)); |
c8094d83 | 7063 | |
23656158 | 7064 | /* Recursively add the secondary VTTs for non-virtual bases. */ |
fa743e8c NS |
7065 | for (i = 0; BINFO_BASE_ITERATE (binfo, i, b); ++i) |
7066 | if (!BINFO_VIRTUAL_P (b)) | |
5d5a519f | 7067 | inits = build_vtt_inits (b, t, inits, index); |
c8094d83 | 7068 | |
23656158 | 7069 | /* Add secondary virtual pointers for all subobjects of BINFO with |
9965d119 NS |
7070 | either virtual bases or reachable along a virtual path, except |
7071 | subobjects that are non-virtual primary bases. */ | |
a3a0fc7f NS |
7072 | data.top_level_p = top_level_p; |
7073 | data.index = *index; | |
7074 | data.inits = NULL; | |
7075 | data.type_being_constructed = BINFO_TYPE (binfo); | |
c8094d83 | 7076 | |
5d5a519f | 7077 | dfs_walk_once (binfo, dfs_build_secondary_vptr_vtt_inits, NULL, &data); |
9965d119 | 7078 | |
a3a0fc7f | 7079 | *index = data.index; |
23656158 MM |
7080 | |
7081 | /* The secondary vptrs come back in reverse order. After we reverse | |
7082 | them, and add the INITS, the last init will be the first element | |
7083 | of the chain. */ | |
a3a0fc7f | 7084 | secondary_vptrs = data.inits; |
23656158 MM |
7085 | if (secondary_vptrs) |
7086 | { | |
7087 | *inits = nreverse (secondary_vptrs); | |
7088 | inits = &TREE_CHAIN (secondary_vptrs); | |
50bc768d | 7089 | gcc_assert (*inits == NULL_TREE); |
23656158 MM |
7090 | } |
7091 | ||
9965d119 | 7092 | if (top_level_p) |
a3a0fc7f NS |
7093 | /* Add the secondary VTTs for virtual bases in inheritance graph |
7094 | order. */ | |
9ccf6541 MM |
7095 | for (b = TYPE_BINFO (BINFO_TYPE (binfo)); b; b = TREE_CHAIN (b)) |
7096 | { | |
809e3e7f | 7097 | if (!BINFO_VIRTUAL_P (b)) |
9ccf6541 | 7098 | continue; |
c8094d83 | 7099 | |
dbbf88d1 | 7100 | inits = build_vtt_inits (b, t, inits, index); |
9ccf6541 | 7101 | } |
a3a0fc7f NS |
7102 | else |
7103 | /* Remove the ctor vtables we created. */ | |
5d5a519f | 7104 | dfs_walk_all (binfo, dfs_fixup_binfo_vtbls, NULL, binfo); |
23656158 MM |
7105 | |
7106 | return inits; | |
7107 | } | |
7108 | ||
8df83eae | 7109 | /* Called from build_vtt_inits via dfs_walk. BINFO is the binfo for the base |
a3a0fc7f | 7110 | in most derived. DATA is a SECONDARY_VPTR_VTT_INIT_DATA structure. */ |
23656158 MM |
7111 | |
7112 | static tree | |
a3a0fc7f | 7113 | dfs_build_secondary_vptr_vtt_inits (tree binfo, void *data_) |
23656158 | 7114 | { |
a3a0fc7f | 7115 | secondary_vptr_vtt_init_data *data = (secondary_vptr_vtt_init_data *)data_; |
23656158 | 7116 | |
23656158 MM |
7117 | /* We don't care about bases that don't have vtables. */ |
7118 | if (!TYPE_VFIELD (BINFO_TYPE (binfo))) | |
5d5a519f | 7119 | return dfs_skip_bases; |
23656158 | 7120 | |
a3a0fc7f NS |
7121 | /* We're only interested in proper subobjects of the type being |
7122 | constructed. */ | |
539ed333 | 7123 | if (SAME_BINFO_TYPE_P (BINFO_TYPE (binfo), data->type_being_constructed)) |
23656158 MM |
7124 | return NULL_TREE; |
7125 | ||
a3a0fc7f NS |
7126 | /* We're only interested in bases with virtual bases or reachable |
7127 | via a virtual path from the type being constructed. */ | |
5d5a519f NS |
7128 | if (!(CLASSTYPE_VBASECLASSES (BINFO_TYPE (binfo)) |
7129 | || binfo_via_virtual (binfo, data->type_being_constructed))) | |
7130 | return dfs_skip_bases; | |
c8094d83 | 7131 | |
5d5a519f NS |
7132 | /* We're not interested in non-virtual primary bases. */ |
7133 | if (!BINFO_VIRTUAL_P (binfo) && BINFO_PRIMARY_P (binfo)) | |
db3d8cde | 7134 | return NULL_TREE; |
c8094d83 | 7135 | |
3ec6bad3 | 7136 | /* Record the index where this secondary vptr can be found. */ |
a3a0fc7f | 7137 | if (data->top_level_p) |
9965d119 | 7138 | { |
50bc768d | 7139 | gcc_assert (!BINFO_VPTR_INDEX (binfo)); |
a3a0fc7f | 7140 | BINFO_VPTR_INDEX (binfo) = data->index; |
3ec6bad3 | 7141 | |
a3a0fc7f NS |
7142 | if (BINFO_VIRTUAL_P (binfo)) |
7143 | { | |
0cbd7506 MS |
7144 | /* It's a primary virtual base, and this is not a |
7145 | construction vtable. Find the base this is primary of in | |
7146 | the inheritance graph, and use that base's vtable | |
7147 | now. */ | |
a3a0fc7f NS |
7148 | while (BINFO_PRIMARY_P (binfo)) |
7149 | binfo = BINFO_INHERITANCE_CHAIN (binfo); | |
7150 | } | |
9965d119 | 7151 | } |
c8094d83 | 7152 | |
a3a0fc7f NS |
7153 | /* Add the initializer for the secondary vptr itself. */ |
7154 | data->inits = tree_cons (NULL_TREE, binfo_ctor_vtable (binfo), data->inits); | |
23656158 | 7155 | |
a3a0fc7f NS |
7156 | /* Advance the vtt index. */ |
7157 | data->index = size_binop (PLUS_EXPR, data->index, | |
7158 | TYPE_SIZE_UNIT (ptr_type_node)); | |
9965d119 | 7159 | |
a3a0fc7f | 7160 | return NULL_TREE; |
9965d119 NS |
7161 | } |
7162 | ||
a3a0fc7f NS |
7163 | /* Called from build_vtt_inits via dfs_walk. After building |
7164 | constructor vtables and generating the sub-vtt from them, we need | |
7165 | to restore the BINFO_VTABLES that were scribbled on. DATA is the | |
7166 | binfo of the base whose sub vtt was generated. */ | |
23656158 MM |
7167 | |
7168 | static tree | |
94edc4ab | 7169 | dfs_fixup_binfo_vtbls (tree binfo, void* data) |
23656158 | 7170 | { |
a3a0fc7f | 7171 | tree vtable = BINFO_VTABLE (binfo); |
23656158 | 7172 | |
5d5a519f NS |
7173 | if (!TYPE_CONTAINS_VPTR_P (BINFO_TYPE (binfo))) |
7174 | /* If this class has no vtable, none of its bases do. */ | |
7175 | return dfs_skip_bases; | |
c8094d83 | 7176 | |
5d5a519f NS |
7177 | if (!vtable) |
7178 | /* This might be a primary base, so have no vtable in this | |
7179 | hierarchy. */ | |
7180 | return NULL_TREE; | |
c8094d83 | 7181 | |
23656158 MM |
7182 | /* If we scribbled the construction vtable vptr into BINFO, clear it |
7183 | out now. */ | |
5d5a519f | 7184 | if (TREE_CODE (vtable) == TREE_LIST |
a3a0fc7f NS |
7185 | && (TREE_PURPOSE (vtable) == (tree) data)) |
7186 | BINFO_VTABLE (binfo) = TREE_CHAIN (vtable); | |
23656158 MM |
7187 | |
7188 | return NULL_TREE; | |
7189 | } | |
7190 | ||
7191 | /* Build the construction vtable group for BINFO which is in the | |
7192 | hierarchy dominated by T. */ | |
7193 | ||
7194 | static void | |
94edc4ab | 7195 | build_ctor_vtbl_group (tree binfo, tree t) |
23656158 MM |
7196 | { |
7197 | tree list; | |
7198 | tree type; | |
7199 | tree vtbl; | |
7200 | tree inits; | |
7201 | tree id; | |
9ccf6541 | 7202 | tree vbase; |
23656158 | 7203 | |
7bdcf888 | 7204 | /* See if we've already created this construction vtable group. */ |
1f84ec23 | 7205 | id = mangle_ctor_vtbl_for_type (t, binfo); |
23656158 MM |
7206 | if (IDENTIFIER_GLOBAL_VALUE (id)) |
7207 | return; | |
7208 | ||
539ed333 | 7209 | gcc_assert (!SAME_BINFO_TYPE_P (BINFO_TYPE (binfo), t)); |
23656158 MM |
7210 | /* Build a version of VTBL (with the wrong type) for use in |
7211 | constructing the addresses of secondary vtables in the | |
7212 | construction vtable group. */ | |
459c43ad | 7213 | vtbl = build_vtable (t, id, ptr_type_node); |
505970fc | 7214 | DECL_CONSTRUCTION_VTABLE_P (vtbl) = 1; |
23656158 MM |
7215 | list = build_tree_list (vtbl, NULL_TREE); |
7216 | accumulate_vtbl_inits (binfo, TYPE_BINFO (TREE_TYPE (binfo)), | |
7217 | binfo, t, list); | |
9965d119 NS |
7218 | |
7219 | /* Add the vtables for each of our virtual bases using the vbase in T | |
7220 | binfo. */ | |
c8094d83 MS |
7221 | for (vbase = TYPE_BINFO (BINFO_TYPE (binfo)); |
7222 | vbase; | |
9ccf6541 MM |
7223 | vbase = TREE_CHAIN (vbase)) |
7224 | { | |
7225 | tree b; | |
7226 | ||
809e3e7f | 7227 | if (!BINFO_VIRTUAL_P (vbase)) |
9ccf6541 | 7228 | continue; |
dbbf88d1 | 7229 | b = copied_binfo (vbase, binfo); |
c8094d83 | 7230 | |
dbbf88d1 | 7231 | accumulate_vtbl_inits (b, vbase, binfo, t, list); |
9ccf6541 | 7232 | } |
99389463 | 7233 | inits = TREE_VALUE (list); |
23656158 MM |
7234 | |
7235 | /* Figure out the type of the construction vtable. */ | |
442e01b6 | 7236 | type = build_index_type (size_int (list_length (inits) - 1)); |
23656158 | 7237 | type = build_cplus_array_type (vtable_entry_type, type); |
8208d7dc | 7238 | layout_type (type); |
23656158 | 7239 | TREE_TYPE (vtbl) = type; |
8208d7dc DJ |
7240 | DECL_SIZE (vtbl) = DECL_SIZE_UNIT (vtbl) = NULL_TREE; |
7241 | layout_decl (vtbl, 0); | |
23656158 MM |
7242 | |
7243 | /* Initialize the construction vtable. */ | |
548502d3 | 7244 | CLASSTYPE_VTABLES (t) = chainon (CLASSTYPE_VTABLES (t), vtbl); |
19c29b2f | 7245 | initialize_artificial_var (vtbl, inits); |
b7442fb5 | 7246 | dump_vtable (t, binfo, vtbl); |
23656158 MM |
7247 | } |
7248 | ||
9965d119 NS |
7249 | /* Add the vtbl initializers for BINFO (and its bases other than |
7250 | non-virtual primaries) to the list of INITS. BINFO is in the | |
7251 | hierarchy dominated by T. RTTI_BINFO is the binfo within T of | |
7252 | the constructor the vtbl inits should be accumulated for. (If this | |
7253 | is the complete object vtbl then RTTI_BINFO will be TYPE_BINFO (T).) | |
7254 | ORIG_BINFO is the binfo for this object within BINFO_TYPE (RTTI_BINFO). | |
7255 | BINFO is the active base equivalent of ORIG_BINFO in the inheritance | |
7256 | graph of T. Both BINFO and ORIG_BINFO will have the same BINFO_TYPE, | |
7257 | but are not necessarily the same in terms of layout. */ | |
ca36f057 MM |
7258 | |
7259 | static void | |
94edc4ab | 7260 | accumulate_vtbl_inits (tree binfo, |
0cbd7506 MS |
7261 | tree orig_binfo, |
7262 | tree rtti_binfo, | |
7263 | tree t, | |
7264 | tree inits) | |
ca36f057 | 7265 | { |
23656158 | 7266 | int i; |
fa743e8c | 7267 | tree base_binfo; |
539ed333 | 7268 | int ctor_vtbl_p = !SAME_BINFO_TYPE_P (BINFO_TYPE (rtti_binfo), t); |
23656158 | 7269 | |
539ed333 | 7270 | gcc_assert (SAME_BINFO_TYPE_P (BINFO_TYPE (binfo), BINFO_TYPE (orig_binfo))); |
23656158 | 7271 | |
00a17e31 | 7272 | /* If it doesn't have a vptr, we don't do anything. */ |
623fe76a NS |
7273 | if (!TYPE_CONTAINS_VPTR_P (BINFO_TYPE (binfo))) |
7274 | return; | |
c8094d83 | 7275 | |
23656158 MM |
7276 | /* If we're building a construction vtable, we're not interested in |
7277 | subobjects that don't require construction vtables. */ | |
c8094d83 | 7278 | if (ctor_vtbl_p |
5775a06a | 7279 | && !CLASSTYPE_VBASECLASSES (BINFO_TYPE (binfo)) |
9965d119 | 7280 | && !binfo_via_virtual (orig_binfo, BINFO_TYPE (rtti_binfo))) |
23656158 MM |
7281 | return; |
7282 | ||
7283 | /* Build the initializers for the BINFO-in-T vtable. */ | |
c8094d83 | 7284 | TREE_VALUE (inits) |
23656158 MM |
7285 | = chainon (TREE_VALUE (inits), |
7286 | dfs_accumulate_vtbl_inits (binfo, orig_binfo, | |
7287 | rtti_binfo, t, inits)); | |
c8094d83 | 7288 | |
c35cce41 MM |
7289 | /* Walk the BINFO and its bases. We walk in preorder so that as we |
7290 | initialize each vtable we can figure out at what offset the | |
23656158 MM |
7291 | secondary vtable lies from the primary vtable. We can't use |
7292 | dfs_walk here because we need to iterate through bases of BINFO | |
7293 | and RTTI_BINFO simultaneously. */ | |
fa743e8c | 7294 | for (i = 0; BINFO_BASE_ITERATE (binfo, i, base_binfo); ++i) |
23656158 | 7295 | { |
23656158 | 7296 | /* Skip virtual bases. */ |
809e3e7f | 7297 | if (BINFO_VIRTUAL_P (base_binfo)) |
23656158 MM |
7298 | continue; |
7299 | accumulate_vtbl_inits (base_binfo, | |
604a3205 | 7300 | BINFO_BASE_BINFO (orig_binfo, i), |
9965d119 | 7301 | rtti_binfo, t, |
23656158 MM |
7302 | inits); |
7303 | } | |
ca36f057 MM |
7304 | } |
7305 | ||
3461fba7 NS |
7306 | /* Called from accumulate_vtbl_inits. Returns the initializers for |
7307 | the BINFO vtable. */ | |
ca36f057 MM |
7308 | |
7309 | static tree | |
94edc4ab | 7310 | dfs_accumulate_vtbl_inits (tree binfo, |
0cbd7506 MS |
7311 | tree orig_binfo, |
7312 | tree rtti_binfo, | |
7313 | tree t, | |
7314 | tree l) | |
ca36f057 | 7315 | { |
23656158 | 7316 | tree inits = NULL_TREE; |
9965d119 | 7317 | tree vtbl = NULL_TREE; |
539ed333 | 7318 | int ctor_vtbl_p = !SAME_BINFO_TYPE_P (BINFO_TYPE (rtti_binfo), t); |
9965d119 | 7319 | |
13de7ec4 | 7320 | if (ctor_vtbl_p |
809e3e7f | 7321 | && BINFO_VIRTUAL_P (orig_binfo) && BINFO_PRIMARY_P (orig_binfo)) |
9965d119 | 7322 | { |
13de7ec4 JM |
7323 | /* In the hierarchy of BINFO_TYPE (RTTI_BINFO), this is a |
7324 | primary virtual base. If it is not the same primary in | |
7325 | the hierarchy of T, we'll need to generate a ctor vtable | |
7326 | for it, to place at its location in T. If it is the same | |
7327 | primary, we still need a VTT entry for the vtable, but it | |
7328 | should point to the ctor vtable for the base it is a | |
7329 | primary for within the sub-hierarchy of RTTI_BINFO. | |
c8094d83 | 7330 | |
13de7ec4 | 7331 | There are three possible cases: |
c8094d83 | 7332 | |
13de7ec4 JM |
7333 | 1) We are in the same place. |
7334 | 2) We are a primary base within a lost primary virtual base of | |
7335 | RTTI_BINFO. | |
049d2def | 7336 | 3) We are primary to something not a base of RTTI_BINFO. */ |
c8094d83 | 7337 | |
fc6633e0 | 7338 | tree b; |
13de7ec4 | 7339 | tree last = NULL_TREE; |
85a9a0a2 | 7340 | |
13de7ec4 JM |
7341 | /* First, look through the bases we are primary to for RTTI_BINFO |
7342 | or a virtual base. */ | |
fc6633e0 NS |
7343 | b = binfo; |
7344 | while (BINFO_PRIMARY_P (b)) | |
7bdcf888 | 7345 | { |
fc6633e0 | 7346 | b = BINFO_INHERITANCE_CHAIN (b); |
13de7ec4 | 7347 | last = b; |
809e3e7f | 7348 | if (BINFO_VIRTUAL_P (b) || b == rtti_binfo) |
fc6633e0 | 7349 | goto found; |
7bdcf888 | 7350 | } |
13de7ec4 JM |
7351 | /* If we run out of primary links, keep looking down our |
7352 | inheritance chain; we might be an indirect primary. */ | |
fc6633e0 NS |
7353 | for (b = last; b; b = BINFO_INHERITANCE_CHAIN (b)) |
7354 | if (BINFO_VIRTUAL_P (b) || b == rtti_binfo) | |
7355 | break; | |
7356 | found: | |
c8094d83 | 7357 | |
13de7ec4 JM |
7358 | /* If we found RTTI_BINFO, this is case 1. If we found a virtual |
7359 | base B and it is a base of RTTI_BINFO, this is case 2. In | |
7360 | either case, we share our vtable with LAST, i.e. the | |
7361 | derived-most base within B of which we are a primary. */ | |
7362 | if (b == rtti_binfo | |
58c42dc2 | 7363 | || (b && binfo_for_vbase (BINFO_TYPE (b), BINFO_TYPE (rtti_binfo)))) |
049d2def JM |
7364 | /* Just set our BINFO_VTABLE to point to LAST, as we may not have |
7365 | set LAST's BINFO_VTABLE yet. We'll extract the actual vptr in | |
7366 | binfo_ctor_vtable after everything's been set up. */ | |
7367 | vtbl = last; | |
13de7ec4 | 7368 | |
049d2def | 7369 | /* Otherwise, this is case 3 and we get our own. */ |
9965d119 | 7370 | } |
dbbf88d1 | 7371 | else if (!BINFO_NEW_VTABLE_MARKED (orig_binfo)) |
9965d119 | 7372 | return inits; |
7bdcf888 | 7373 | |
9965d119 | 7374 | if (!vtbl) |
ca36f057 | 7375 | { |
c35cce41 MM |
7376 | tree index; |
7377 | int non_fn_entries; | |
7378 | ||
7379 | /* Compute the initializer for this vtable. */ | |
23656158 | 7380 | inits = build_vtbl_initializer (binfo, orig_binfo, t, rtti_binfo, |
aabb4cd6 | 7381 | &non_fn_entries); |
c35cce41 | 7382 | |
23656158 | 7383 | /* Figure out the position to which the VPTR should point. */ |
c35cce41 | 7384 | vtbl = TREE_PURPOSE (l); |
6de9cd9a | 7385 | vtbl = build1 (ADDR_EXPR, vtbl_ptr_type_node, vtbl); |
c35cce41 MM |
7386 | index = size_binop (PLUS_EXPR, |
7387 | size_int (non_fn_entries), | |
7388 | size_int (list_length (TREE_VALUE (l)))); | |
23656158 MM |
7389 | index = size_binop (MULT_EXPR, |
7390 | TYPE_SIZE_UNIT (vtable_entry_type), | |
7391 | index); | |
5be014d5 | 7392 | vtbl = build2 (POINTER_PLUS_EXPR, TREE_TYPE (vtbl), vtbl, index); |
9965d119 | 7393 | } |
23656158 | 7394 | |
7bdcf888 | 7395 | if (ctor_vtbl_p) |
9965d119 NS |
7396 | /* For a construction vtable, we can't overwrite BINFO_VTABLE. |
7397 | So, we make a TREE_LIST. Later, dfs_fixup_binfo_vtbls will | |
7398 | straighten this out. */ | |
7399 | BINFO_VTABLE (binfo) = tree_cons (rtti_binfo, vtbl, BINFO_VTABLE (binfo)); | |
809e3e7f | 7400 | else if (BINFO_PRIMARY_P (binfo) && BINFO_VIRTUAL_P (binfo)) |
7bdcf888 NS |
7401 | inits = NULL_TREE; |
7402 | else | |
7403 | /* For an ordinary vtable, set BINFO_VTABLE. */ | |
7404 | BINFO_VTABLE (binfo) = vtbl; | |
ca36f057 | 7405 | |
23656158 | 7406 | return inits; |
ca36f057 MM |
7407 | } |
7408 | ||
1b746b0f AP |
7409 | static GTY(()) tree abort_fndecl_addr; |
7410 | ||
90ecce3e | 7411 | /* Construct the initializer for BINFO's virtual function table. BINFO |
aabb4cd6 | 7412 | is part of the hierarchy dominated by T. If we're building a |
23656158 | 7413 | construction vtable, the ORIG_BINFO is the binfo we should use to |
9965d119 NS |
7414 | find the actual function pointers to put in the vtable - but they |
7415 | can be overridden on the path to most-derived in the graph that | |
7416 | ORIG_BINFO belongs. Otherwise, | |
911a71a7 | 7417 | ORIG_BINFO should be the same as BINFO. The RTTI_BINFO is the |
23656158 MM |
7418 | BINFO that should be indicated by the RTTI information in the |
7419 | vtable; it will be a base class of T, rather than T itself, if we | |
7420 | are building a construction vtable. | |
aabb4cd6 MM |
7421 | |
7422 | The value returned is a TREE_LIST suitable for wrapping in a | |
7423 | CONSTRUCTOR to use as the DECL_INITIAL for a vtable. If | |
7424 | NON_FN_ENTRIES_P is not NULL, *NON_FN_ENTRIES_P is set to the | |
c8094d83 | 7425 | number of non-function entries in the vtable. |
911a71a7 MM |
7426 | |
7427 | It might seem that this function should never be called with a | |
9965d119 | 7428 | BINFO for which BINFO_PRIMARY_P holds, the vtable for such a |
911a71a7 | 7429 | base is always subsumed by a derived class vtable. However, when |
9965d119 | 7430 | we are building construction vtables, we do build vtables for |
911a71a7 MM |
7431 | primary bases; we need these while the primary base is being |
7432 | constructed. */ | |
ca36f057 MM |
7433 | |
7434 | static tree | |
94edc4ab | 7435 | build_vtbl_initializer (tree binfo, |
0cbd7506 MS |
7436 | tree orig_binfo, |
7437 | tree t, | |
7438 | tree rtti_binfo, | |
7439 | int* non_fn_entries_p) | |
ca36f057 | 7440 | { |
d0cd8b44 | 7441 | tree v, b; |
911a71a7 | 7442 | tree vfun_inits; |
911a71a7 | 7443 | vtbl_init_data vid; |
58c42dc2 NS |
7444 | unsigned ix; |
7445 | tree vbinfo; | |
d4e6fecb | 7446 | VEC(tree,gc) *vbases; |
c8094d83 | 7447 | |
911a71a7 | 7448 | /* Initialize VID. */ |
961192e1 | 7449 | memset (&vid, 0, sizeof (vid)); |
911a71a7 MM |
7450 | vid.binfo = binfo; |
7451 | vid.derived = t; | |
73ea87d7 | 7452 | vid.rtti_binfo = rtti_binfo; |
911a71a7 | 7453 | vid.last_init = &vid.inits; |
539ed333 NS |
7454 | vid.primary_vtbl_p = SAME_BINFO_TYPE_P (BINFO_TYPE (binfo), t); |
7455 | vid.ctor_vtbl_p = !SAME_BINFO_TYPE_P (BINFO_TYPE (rtti_binfo), t); | |
548502d3 | 7456 | vid.generate_vcall_entries = true; |
c35cce41 | 7457 | /* The first vbase or vcall offset is at index -3 in the vtable. */ |
ce552f75 | 7458 | vid.index = ssize_int(-3 * TARGET_VTABLE_DATA_ENTRY_DISTANCE); |
c35cce41 | 7459 | |
9bab6c90 | 7460 | /* Add entries to the vtable for RTTI. */ |
73ea87d7 | 7461 | build_rtti_vtbl_entries (binfo, &vid); |
9bab6c90 | 7462 | |
b485e15b MM |
7463 | /* Create an array for keeping track of the functions we've |
7464 | processed. When we see multiple functions with the same | |
7465 | signature, we share the vcall offsets. */ | |
1e625046 | 7466 | vid.fns = VEC_alloc (tree, gc, 32); |
c35cce41 | 7467 | /* Add the vcall and vbase offset entries. */ |
911a71a7 | 7468 | build_vcall_and_vbase_vtbl_entries (binfo, &vid); |
c8094d83 | 7469 | |
79cda2d1 | 7470 | /* Clear BINFO_VTABLE_PATH_MARKED; it's set by |
c35cce41 | 7471 | build_vbase_offset_vtbl_entries. */ |
9ba5ff0f NS |
7472 | for (vbases = CLASSTYPE_VBASECLASSES (t), ix = 0; |
7473 | VEC_iterate (tree, vbases, ix, vbinfo); ix++) | |
58c42dc2 | 7474 | BINFO_VTABLE_PATH_MARKED (vbinfo) = 0; |
ca36f057 | 7475 | |
a6f5e048 RH |
7476 | /* If the target requires padding between data entries, add that now. */ |
7477 | if (TARGET_VTABLE_DATA_ENTRY_DISTANCE > 1) | |
7478 | { | |
7479 | tree cur, *prev; | |
7480 | ||
7481 | for (prev = &vid.inits; (cur = *prev); prev = &TREE_CHAIN (cur)) | |
7482 | { | |
7483 | tree add = cur; | |
7484 | int i; | |
7485 | ||
7486 | for (i = 1; i < TARGET_VTABLE_DATA_ENTRY_DISTANCE; ++i) | |
7befdb9f | 7487 | add = tree_cons (NULL_TREE, |
2e88ae22 SE |
7488 | build1 (NOP_EXPR, vtable_entry_type, |
7489 | null_pointer_node), | |
7befdb9f | 7490 | add); |
a6f5e048 RH |
7491 | *prev = add; |
7492 | } | |
7493 | } | |
7494 | ||
c35cce41 | 7495 | if (non_fn_entries_p) |
911a71a7 | 7496 | *non_fn_entries_p = list_length (vid.inits); |
ca36f057 MM |
7497 | |
7498 | /* Go through all the ordinary virtual functions, building up | |
7499 | initializers. */ | |
c35cce41 | 7500 | vfun_inits = NULL_TREE; |
23656158 | 7501 | for (v = BINFO_VIRTUALS (orig_binfo); v; v = TREE_CHAIN (v)) |
ca36f057 MM |
7502 | { |
7503 | tree delta; | |
7504 | tree vcall_index; | |
4977bab6 | 7505 | tree fn, fn_original; |
f11ee281 | 7506 | tree init = NULL_TREE; |
c8094d83 | 7507 | |
ca36f057 | 7508 | fn = BV_FN (v); |
07fa4878 NS |
7509 | fn_original = fn; |
7510 | if (DECL_THUNK_P (fn)) | |
4977bab6 | 7511 | { |
07fa4878 NS |
7512 | if (!DECL_NAME (fn)) |
7513 | finish_thunk (fn); | |
e00853fd | 7514 | if (THUNK_ALIAS (fn)) |
bb885938 NS |
7515 | { |
7516 | fn = THUNK_ALIAS (fn); | |
7517 | BV_FN (v) = fn; | |
7518 | } | |
07fa4878 | 7519 | fn_original = THUNK_TARGET (fn); |
4977bab6 | 7520 | } |
c8094d83 | 7521 | |
d0cd8b44 JM |
7522 | /* If the only definition of this function signature along our |
7523 | primary base chain is from a lost primary, this vtable slot will | |
7524 | never be used, so just zero it out. This is important to avoid | |
7525 | requiring extra thunks which cannot be generated with the function. | |
7526 | ||
f11ee281 JM |
7527 | We first check this in update_vtable_entry_for_fn, so we handle |
7528 | restored primary bases properly; we also need to do it here so we | |
39a13be5 | 7529 | zero out unused slots in ctor vtables, rather than filling them |
f11ee281 JM |
7530 | with erroneous values (though harmless, apart from relocation |
7531 | costs). */ | |
7532 | for (b = binfo; ; b = get_primary_binfo (b)) | |
7533 | { | |
7534 | /* We found a defn before a lost primary; go ahead as normal. */ | |
4977bab6 | 7535 | if (look_for_overrides_here (BINFO_TYPE (b), fn_original)) |
f11ee281 JM |
7536 | break; |
7537 | ||
7538 | /* The nearest definition is from a lost primary; clear the | |
7539 | slot. */ | |
7540 | if (BINFO_LOST_PRIMARY_P (b)) | |
7541 | { | |
7542 | init = size_zero_node; | |
d0cd8b44 | 7543 | break; |
f11ee281 JM |
7544 | } |
7545 | } | |
d0cd8b44 | 7546 | |
f11ee281 JM |
7547 | if (! init) |
7548 | { | |
7549 | /* Pull the offset for `this', and the function to call, out of | |
7550 | the list. */ | |
7551 | delta = BV_DELTA (v); | |
548502d3 | 7552 | vcall_index = BV_VCALL_INDEX (v); |
f11ee281 | 7553 | |
50bc768d NS |
7554 | gcc_assert (TREE_CODE (delta) == INTEGER_CST); |
7555 | gcc_assert (TREE_CODE (fn) == FUNCTION_DECL); | |
f11ee281 JM |
7556 | |
7557 | /* You can't call an abstract virtual function; it's abstract. | |
7558 | So, we replace these functions with __pure_virtual. */ | |
4977bab6 | 7559 | if (DECL_PURE_VIRTUAL_P (fn_original)) |
4977bab6 | 7560 | { |
1b746b0f AP |
7561 | fn = abort_fndecl; |
7562 | if (abort_fndecl_addr == NULL) | |
7563 | abort_fndecl_addr = build1 (ADDR_EXPR, vfunc_ptr_type_node, fn); | |
7564 | init = abort_fndecl_addr; | |
7565 | } | |
7566 | else | |
7567 | { | |
7568 | if (!integer_zerop (delta) || vcall_index) | |
7569 | { | |
7570 | fn = make_thunk (fn, /*this_adjusting=*/1, delta, vcall_index); | |
7571 | if (!DECL_NAME (fn)) | |
7572 | finish_thunk (fn); | |
7573 | } | |
7574 | /* Take the address of the function, considering it to be of an | |
7575 | appropriate generic type. */ | |
7576 | init = build1 (ADDR_EXPR, vfunc_ptr_type_node, fn); | |
4977bab6 | 7577 | } |
f11ee281 | 7578 | } |
d0cd8b44 | 7579 | |
ca36f057 | 7580 | /* And add it to the chain of initializers. */ |
67231816 RH |
7581 | if (TARGET_VTABLE_USES_DESCRIPTORS) |
7582 | { | |
7583 | int i; | |
7584 | if (init == size_zero_node) | |
7585 | for (i = 0; i < TARGET_VTABLE_USES_DESCRIPTORS; ++i) | |
7586 | vfun_inits = tree_cons (NULL_TREE, init, vfun_inits); | |
7587 | else | |
7588 | for (i = 0; i < TARGET_VTABLE_USES_DESCRIPTORS; ++i) | |
7589 | { | |
f293ce4b RS |
7590 | tree fdesc = build2 (FDESC_EXPR, vfunc_ptr_type_node, |
7591 | TREE_OPERAND (init, 0), | |
7d60be94 | 7592 | build_int_cst (NULL_TREE, i)); |
67231816 RH |
7593 | TREE_CONSTANT (fdesc) = 1; |
7594 | ||
7595 | vfun_inits = tree_cons (NULL_TREE, fdesc, vfun_inits); | |
7596 | } | |
7597 | } | |
7598 | else | |
0cbd7506 | 7599 | vfun_inits = tree_cons (NULL_TREE, init, vfun_inits); |
ca36f057 MM |
7600 | } |
7601 | ||
c35cce41 MM |
7602 | /* The initializers for virtual functions were built up in reverse |
7603 | order; straighten them out now. */ | |
7604 | vfun_inits = nreverse (vfun_inits); | |
c8094d83 | 7605 | |
9bab6c90 | 7606 | /* The negative offset initializers are also in reverse order. */ |
911a71a7 | 7607 | vid.inits = nreverse (vid.inits); |
9bab6c90 MM |
7608 | |
7609 | /* Chain the two together. */ | |
911a71a7 | 7610 | return chainon (vid.inits, vfun_inits); |
ca36f057 MM |
7611 | } |
7612 | ||
d0cd8b44 | 7613 | /* Adds to vid->inits the initializers for the vbase and vcall |
c35cce41 | 7614 | offsets in BINFO, which is in the hierarchy dominated by T. */ |
ca36f057 | 7615 | |
c35cce41 | 7616 | static void |
94edc4ab | 7617 | build_vcall_and_vbase_vtbl_entries (tree binfo, vtbl_init_data* vid) |
ca36f057 | 7618 | { |
c35cce41 | 7619 | tree b; |
8d08fdba | 7620 | |
c35cce41 | 7621 | /* If this is a derived class, we must first create entries |
9bab6c90 | 7622 | corresponding to the primary base class. */ |
911a71a7 | 7623 | b = get_primary_binfo (binfo); |
c35cce41 | 7624 | if (b) |
911a71a7 | 7625 | build_vcall_and_vbase_vtbl_entries (b, vid); |
c35cce41 MM |
7626 | |
7627 | /* Add the vbase entries for this base. */ | |
911a71a7 | 7628 | build_vbase_offset_vtbl_entries (binfo, vid); |
c35cce41 | 7629 | /* Add the vcall entries for this base. */ |
911a71a7 | 7630 | build_vcall_offset_vtbl_entries (binfo, vid); |
ca36f057 | 7631 | } |
8d08fdba | 7632 | |
ca36f057 MM |
7633 | /* Returns the initializers for the vbase offset entries in the vtable |
7634 | for BINFO (which is part of the class hierarchy dominated by T), in | |
c35cce41 MM |
7635 | reverse order. VBASE_OFFSET_INDEX gives the vtable index |
7636 | where the next vbase offset will go. */ | |
8d08fdba | 7637 | |
c35cce41 | 7638 | static void |
94edc4ab | 7639 | build_vbase_offset_vtbl_entries (tree binfo, vtbl_init_data* vid) |
ca36f057 | 7640 | { |
c35cce41 MM |
7641 | tree vbase; |
7642 | tree t; | |
90b1ca2f | 7643 | tree non_primary_binfo; |
8d08fdba | 7644 | |
ca36f057 MM |
7645 | /* If there are no virtual baseclasses, then there is nothing to |
7646 | do. */ | |
5775a06a | 7647 | if (!CLASSTYPE_VBASECLASSES (BINFO_TYPE (binfo))) |
c35cce41 | 7648 | return; |
ca36f057 | 7649 | |
911a71a7 | 7650 | t = vid->derived; |
c8094d83 | 7651 | |
90b1ca2f NS |
7652 | /* We might be a primary base class. Go up the inheritance hierarchy |
7653 | until we find the most derived class of which we are a primary base: | |
7654 | it is the offset of that which we need to use. */ | |
7655 | non_primary_binfo = binfo; | |
7656 | while (BINFO_INHERITANCE_CHAIN (non_primary_binfo)) | |
7657 | { | |
7658 | tree b; | |
7659 | ||
7660 | /* If we have reached a virtual base, then it must be a primary | |
7661 | base (possibly multi-level) of vid->binfo, or we wouldn't | |
7662 | have called build_vcall_and_vbase_vtbl_entries for it. But it | |
7663 | might be a lost primary, so just skip down to vid->binfo. */ | |
809e3e7f | 7664 | if (BINFO_VIRTUAL_P (non_primary_binfo)) |
90b1ca2f NS |
7665 | { |
7666 | non_primary_binfo = vid->binfo; | |
7667 | break; | |
7668 | } | |
7669 | ||
7670 | b = BINFO_INHERITANCE_CHAIN (non_primary_binfo); | |
7671 | if (get_primary_binfo (b) != non_primary_binfo) | |
7672 | break; | |
7673 | non_primary_binfo = b; | |
7674 | } | |
ca36f057 | 7675 | |
c35cce41 MM |
7676 | /* Go through the virtual bases, adding the offsets. */ |
7677 | for (vbase = TYPE_BINFO (BINFO_TYPE (binfo)); | |
7678 | vbase; | |
7679 | vbase = TREE_CHAIN (vbase)) | |
7680 | { | |
7681 | tree b; | |
7682 | tree delta; | |
c8094d83 | 7683 | |
809e3e7f | 7684 | if (!BINFO_VIRTUAL_P (vbase)) |
c35cce41 | 7685 | continue; |
ca36f057 | 7686 | |
c35cce41 MM |
7687 | /* Find the instance of this virtual base in the complete |
7688 | object. */ | |
dbbf88d1 | 7689 | b = copied_binfo (vbase, binfo); |
c35cce41 MM |
7690 | |
7691 | /* If we've already got an offset for this virtual base, we | |
7692 | don't need another one. */ | |
7693 | if (BINFO_VTABLE_PATH_MARKED (b)) | |
7694 | continue; | |
dbbf88d1 | 7695 | BINFO_VTABLE_PATH_MARKED (b) = 1; |
c35cce41 MM |
7696 | |
7697 | /* Figure out where we can find this vbase offset. */ | |
c8094d83 | 7698 | delta = size_binop (MULT_EXPR, |
911a71a7 | 7699 | vid->index, |
c35cce41 MM |
7700 | convert (ssizetype, |
7701 | TYPE_SIZE_UNIT (vtable_entry_type))); | |
911a71a7 | 7702 | if (vid->primary_vtbl_p) |
c35cce41 MM |
7703 | BINFO_VPTR_FIELD (b) = delta; |
7704 | ||
7705 | if (binfo != TYPE_BINFO (t)) | |
50bc768d NS |
7706 | /* The vbase offset had better be the same. */ |
7707 | gcc_assert (tree_int_cst_equal (delta, BINFO_VPTR_FIELD (vbase))); | |
c35cce41 MM |
7708 | |
7709 | /* The next vbase will come at a more negative offset. */ | |
a6f5e048 RH |
7710 | vid->index = size_binop (MINUS_EXPR, vid->index, |
7711 | ssize_int (TARGET_VTABLE_DATA_ENTRY_DISTANCE)); | |
c35cce41 MM |
7712 | |
7713 | /* The initializer is the delta from BINFO to this virtual base. | |
4e7512c9 MM |
7714 | The vbase offsets go in reverse inheritance-graph order, and |
7715 | we are walking in inheritance graph order so these end up in | |
7716 | the right order. */ | |
90b1ca2f | 7717 | delta = size_diffop (BINFO_OFFSET (b), BINFO_OFFSET (non_primary_binfo)); |
c8094d83 MS |
7718 | |
7719 | *vid->last_init | |
9bab6c90 | 7720 | = build_tree_list (NULL_TREE, |
c8094d83 | 7721 | fold_build1 (NOP_EXPR, |
7866705a SB |
7722 | vtable_entry_type, |
7723 | delta)); | |
911a71a7 | 7724 | vid->last_init = &TREE_CHAIN (*vid->last_init); |
c35cce41 | 7725 | } |
8d08fdba | 7726 | } |
ca36f057 | 7727 | |
b485e15b | 7728 | /* Adds the initializers for the vcall offset entries in the vtable |
d0cd8b44 JM |
7729 | for BINFO (which is part of the class hierarchy dominated by VID->DERIVED) |
7730 | to VID->INITS. */ | |
b485e15b MM |
7731 | |
7732 | static void | |
94edc4ab | 7733 | build_vcall_offset_vtbl_entries (tree binfo, vtbl_init_data* vid) |
b485e15b | 7734 | { |
548502d3 MM |
7735 | /* We only need these entries if this base is a virtual base. We |
7736 | compute the indices -- but do not add to the vtable -- when | |
7737 | building the main vtable for a class. */ | |
b9302915 MM |
7738 | if (binfo == TYPE_BINFO (vid->derived) |
7739 | || (BINFO_VIRTUAL_P (binfo) | |
7740 | /* If BINFO is RTTI_BINFO, then (since BINFO does not | |
7741 | correspond to VID->DERIVED), we are building a primary | |
7742 | construction virtual table. Since this is a primary | |
7743 | virtual table, we do not need the vcall offsets for | |
7744 | BINFO. */ | |
7745 | && binfo != vid->rtti_binfo)) | |
548502d3 MM |
7746 | { |
7747 | /* We need a vcall offset for each of the virtual functions in this | |
7748 | vtable. For example: | |
b485e15b | 7749 | |
548502d3 MM |
7750 | class A { virtual void f (); }; |
7751 | class B1 : virtual public A { virtual void f (); }; | |
7752 | class B2 : virtual public A { virtual void f (); }; | |
7753 | class C: public B1, public B2 { virtual void f (); }; | |
d0cd8b44 | 7754 | |
548502d3 MM |
7755 | A C object has a primary base of B1, which has a primary base of A. A |
7756 | C also has a secondary base of B2, which no longer has a primary base | |
7757 | of A. So the B2-in-C construction vtable needs a secondary vtable for | |
7758 | A, which will adjust the A* to a B2* to call f. We have no way of | |
7759 | knowing what (or even whether) this offset will be when we define B2, | |
7760 | so we store this "vcall offset" in the A sub-vtable and look it up in | |
7761 | a "virtual thunk" for B2::f. | |
b485e15b | 7762 | |
548502d3 MM |
7763 | We need entries for all the functions in our primary vtable and |
7764 | in our non-virtual bases' secondary vtables. */ | |
7765 | vid->vbase = binfo; | |
7766 | /* If we are just computing the vcall indices -- but do not need | |
7767 | the actual entries -- not that. */ | |
809e3e7f | 7768 | if (!BINFO_VIRTUAL_P (binfo)) |
548502d3 MM |
7769 | vid->generate_vcall_entries = false; |
7770 | /* Now, walk through the non-virtual bases, adding vcall offsets. */ | |
7771 | add_vcall_offset_vtbl_entries_r (binfo, vid); | |
7772 | } | |
b485e15b MM |
7773 | } |
7774 | ||
7775 | /* Build vcall offsets, starting with those for BINFO. */ | |
7776 | ||
7777 | static void | |
94edc4ab | 7778 | add_vcall_offset_vtbl_entries_r (tree binfo, vtbl_init_data* vid) |
b485e15b MM |
7779 | { |
7780 | int i; | |
7781 | tree primary_binfo; | |
fa743e8c | 7782 | tree base_binfo; |
b485e15b MM |
7783 | |
7784 | /* Don't walk into virtual bases -- except, of course, for the | |
d0cd8b44 JM |
7785 | virtual base for which we are building vcall offsets. Any |
7786 | primary virtual base will have already had its offsets generated | |
7787 | through the recursion in build_vcall_and_vbase_vtbl_entries. */ | |
809e3e7f | 7788 | if (BINFO_VIRTUAL_P (binfo) && vid->vbase != binfo) |
b485e15b | 7789 | return; |
c8094d83 | 7790 | |
b485e15b MM |
7791 | /* If BINFO has a primary base, process it first. */ |
7792 | primary_binfo = get_primary_binfo (binfo); | |
7793 | if (primary_binfo) | |
7794 | add_vcall_offset_vtbl_entries_r (primary_binfo, vid); | |
7795 | ||
7796 | /* Add BINFO itself to the list. */ | |
7797 | add_vcall_offset_vtbl_entries_1 (binfo, vid); | |
7798 | ||
7799 | /* Scan the non-primary bases of BINFO. */ | |
fa743e8c NS |
7800 | for (i = 0; BINFO_BASE_ITERATE (binfo, i, base_binfo); ++i) |
7801 | if (base_binfo != primary_binfo) | |
7802 | add_vcall_offset_vtbl_entries_r (base_binfo, vid); | |
b485e15b MM |
7803 | } |
7804 | ||
9965d119 | 7805 | /* Called from build_vcall_offset_vtbl_entries_r. */ |
e92cc029 | 7806 | |
b485e15b | 7807 | static void |
94edc4ab | 7808 | add_vcall_offset_vtbl_entries_1 (tree binfo, vtbl_init_data* vid) |
8d08fdba | 7809 | { |
e6a66567 MM |
7810 | /* Make entries for the rest of the virtuals. */ |
7811 | if (abi_version_at_least (2)) | |
31f8e4f3 | 7812 | { |
e6a66567 | 7813 | tree orig_fn; |
911a71a7 | 7814 | |
e6a66567 MM |
7815 | /* The ABI requires that the methods be processed in declaration |
7816 | order. G++ 3.2 used the order in the vtable. */ | |
7817 | for (orig_fn = TYPE_METHODS (BINFO_TYPE (binfo)); | |
7818 | orig_fn; | |
7819 | orig_fn = TREE_CHAIN (orig_fn)) | |
7820 | if (DECL_VINDEX (orig_fn)) | |
95675950 | 7821 | add_vcall_offset (orig_fn, binfo, vid); |
e6a66567 MM |
7822 | } |
7823 | else | |
7824 | { | |
7825 | tree derived_virtuals; | |
7826 | tree base_virtuals; | |
7827 | tree orig_virtuals; | |
7828 | /* If BINFO is a primary base, the most derived class which has | |
7829 | BINFO as a primary base; otherwise, just BINFO. */ | |
7830 | tree non_primary_binfo; | |
7831 | ||
7832 | /* We might be a primary base class. Go up the inheritance hierarchy | |
7833 | until we find the most derived class of which we are a primary base: | |
7834 | it is the BINFO_VIRTUALS there that we need to consider. */ | |
7835 | non_primary_binfo = binfo; | |
7836 | while (BINFO_INHERITANCE_CHAIN (non_primary_binfo)) | |
911a71a7 | 7837 | { |
e6a66567 MM |
7838 | tree b; |
7839 | ||
7840 | /* If we have reached a virtual base, then it must be vid->vbase, | |
7841 | because we ignore other virtual bases in | |
7842 | add_vcall_offset_vtbl_entries_r. In turn, it must be a primary | |
7843 | base (possibly multi-level) of vid->binfo, or we wouldn't | |
7844 | have called build_vcall_and_vbase_vtbl_entries for it. But it | |
7845 | might be a lost primary, so just skip down to vid->binfo. */ | |
809e3e7f | 7846 | if (BINFO_VIRTUAL_P (non_primary_binfo)) |
e6a66567 | 7847 | { |
8dc2b103 | 7848 | gcc_assert (non_primary_binfo == vid->vbase); |
e6a66567 MM |
7849 | non_primary_binfo = vid->binfo; |
7850 | break; | |
7851 | } | |
911a71a7 | 7852 | |
e6a66567 MM |
7853 | b = BINFO_INHERITANCE_CHAIN (non_primary_binfo); |
7854 | if (get_primary_binfo (b) != non_primary_binfo) | |
7855 | break; | |
7856 | non_primary_binfo = b; | |
7857 | } | |
4e7512c9 | 7858 | |
e6a66567 MM |
7859 | if (vid->ctor_vtbl_p) |
7860 | /* For a ctor vtable we need the equivalent binfo within the hierarchy | |
7861 | where rtti_binfo is the most derived type. */ | |
dbbf88d1 NS |
7862 | non_primary_binfo |
7863 | = original_binfo (non_primary_binfo, vid->rtti_binfo); | |
c8094d83 | 7864 | |
e6a66567 MM |
7865 | for (base_virtuals = BINFO_VIRTUALS (binfo), |
7866 | derived_virtuals = BINFO_VIRTUALS (non_primary_binfo), | |
7867 | orig_virtuals = BINFO_VIRTUALS (TYPE_BINFO (BINFO_TYPE (binfo))); | |
7868 | base_virtuals; | |
7869 | base_virtuals = TREE_CHAIN (base_virtuals), | |
7870 | derived_virtuals = TREE_CHAIN (derived_virtuals), | |
7871 | orig_virtuals = TREE_CHAIN (orig_virtuals)) | |
7872 | { | |
7873 | tree orig_fn; | |
73ea87d7 | 7874 | |
e6a66567 MM |
7875 | /* Find the declaration that originally caused this function to |
7876 | be present in BINFO_TYPE (binfo). */ | |
7877 | orig_fn = BV_FN (orig_virtuals); | |
9bab6c90 | 7878 | |
e6a66567 MM |
7879 | /* When processing BINFO, we only want to generate vcall slots for |
7880 | function slots introduced in BINFO. So don't try to generate | |
7881 | one if the function isn't even defined in BINFO. */ | |
539ed333 | 7882 | if (!SAME_BINFO_TYPE_P (BINFO_TYPE (binfo), DECL_CONTEXT (orig_fn))) |
e6a66567 | 7883 | continue; |
b485e15b | 7884 | |
95675950 | 7885 | add_vcall_offset (orig_fn, binfo, vid); |
e6a66567 MM |
7886 | } |
7887 | } | |
7888 | } | |
b485e15b | 7889 | |
95675950 | 7890 | /* Add a vcall offset entry for ORIG_FN to the vtable. */ |
b485e15b | 7891 | |
e6a66567 | 7892 | static void |
95675950 | 7893 | add_vcall_offset (tree orig_fn, tree binfo, vtbl_init_data *vid) |
e6a66567 MM |
7894 | { |
7895 | size_t i; | |
7896 | tree vcall_offset; | |
1e625046 | 7897 | tree derived_entry; |
9bab6c90 | 7898 | |
e6a66567 MM |
7899 | /* If there is already an entry for a function with the same |
7900 | signature as FN, then we do not need a second vcall offset. | |
7901 | Check the list of functions already present in the derived | |
7902 | class vtable. */ | |
c8094d83 | 7903 | for (i = 0; VEC_iterate (tree, vid->fns, i, derived_entry); ++i) |
e6a66567 | 7904 | { |
e6a66567 MM |
7905 | if (same_signature_p (derived_entry, orig_fn) |
7906 | /* We only use one vcall offset for virtual destructors, | |
7907 | even though there are two virtual table entries. */ | |
7908 | || (DECL_DESTRUCTOR_P (derived_entry) | |
7909 | && DECL_DESTRUCTOR_P (orig_fn))) | |
7910 | return; | |
7911 | } | |
4e7512c9 | 7912 | |
e6a66567 MM |
7913 | /* If we are building these vcall offsets as part of building |
7914 | the vtable for the most derived class, remember the vcall | |
7915 | offset. */ | |
7916 | if (vid->binfo == TYPE_BINFO (vid->derived)) | |
0871761b | 7917 | { |
d4e6fecb | 7918 | tree_pair_p elt = VEC_safe_push (tree_pair_s, gc, |
0871761b NS |
7919 | CLASSTYPE_VCALL_INDICES (vid->derived), |
7920 | NULL); | |
7921 | elt->purpose = orig_fn; | |
7922 | elt->value = vid->index; | |
7923 | } | |
c8094d83 | 7924 | |
e6a66567 MM |
7925 | /* The next vcall offset will be found at a more negative |
7926 | offset. */ | |
7927 | vid->index = size_binop (MINUS_EXPR, vid->index, | |
7928 | ssize_int (TARGET_VTABLE_DATA_ENTRY_DISTANCE)); | |
7929 | ||
7930 | /* Keep track of this function. */ | |
1e625046 | 7931 | VEC_safe_push (tree, gc, vid->fns, orig_fn); |
e6a66567 MM |
7932 | |
7933 | if (vid->generate_vcall_entries) | |
7934 | { | |
7935 | tree base; | |
e6a66567 | 7936 | tree fn; |
548502d3 | 7937 | |
e6a66567 | 7938 | /* Find the overriding function. */ |
95675950 | 7939 | fn = find_final_overrider (vid->rtti_binfo, binfo, orig_fn); |
e6a66567 MM |
7940 | if (fn == error_mark_node) |
7941 | vcall_offset = build1 (NOP_EXPR, vtable_entry_type, | |
7942 | integer_zero_node); | |
7943 | else | |
7944 | { | |
95675950 MM |
7945 | base = TREE_VALUE (fn); |
7946 | ||
7947 | /* The vbase we're working on is a primary base of | |
7948 | vid->binfo. But it might be a lost primary, so its | |
7949 | BINFO_OFFSET might be wrong, so we just use the | |
7950 | BINFO_OFFSET from vid->binfo. */ | |
7951 | vcall_offset = size_diffop (BINFO_OFFSET (base), | |
7952 | BINFO_OFFSET (vid->binfo)); | |
7866705a SB |
7953 | vcall_offset = fold_build1 (NOP_EXPR, vtable_entry_type, |
7954 | vcall_offset); | |
548502d3 | 7955 | } |
34cd5ae7 | 7956 | /* Add the initializer to the vtable. */ |
e6a66567 MM |
7957 | *vid->last_init = build_tree_list (NULL_TREE, vcall_offset); |
7958 | vid->last_init = &TREE_CHAIN (*vid->last_init); | |
c35cce41 | 7959 | } |
570221c2 | 7960 | } |
b54ccf71 | 7961 | |
34cd5ae7 | 7962 | /* Return vtbl initializers for the RTTI entries corresponding to the |
aabb4cd6 | 7963 | BINFO's vtable. The RTTI entries should indicate the object given |
73ea87d7 | 7964 | by VID->rtti_binfo. */ |
b54ccf71 | 7965 | |
9bab6c90 | 7966 | static void |
94edc4ab | 7967 | build_rtti_vtbl_entries (tree binfo, vtbl_init_data* vid) |
b54ccf71 | 7968 | { |
ca36f057 | 7969 | tree b; |
aabb4cd6 | 7970 | tree t; |
ca36f057 | 7971 | tree basetype; |
ca36f057 MM |
7972 | tree offset; |
7973 | tree decl; | |
7974 | tree init; | |
b54ccf71 | 7975 | |
ca36f057 | 7976 | basetype = BINFO_TYPE (binfo); |
73ea87d7 | 7977 | t = BINFO_TYPE (vid->rtti_binfo); |
b54ccf71 | 7978 | |
ca36f057 MM |
7979 | /* To find the complete object, we will first convert to our most |
7980 | primary base, and then add the offset in the vtbl to that value. */ | |
7981 | b = binfo; | |
9965d119 | 7982 | while (CLASSTYPE_HAS_PRIMARY_BASE_P (BINFO_TYPE (b)) |
0cbd7506 | 7983 | && !BINFO_LOST_PRIMARY_P (b)) |
b54ccf71 | 7984 | { |
c35cce41 MM |
7985 | tree primary_base; |
7986 | ||
911a71a7 | 7987 | primary_base = get_primary_binfo (b); |
fc6633e0 NS |
7988 | gcc_assert (BINFO_PRIMARY_P (primary_base) |
7989 | && BINFO_INHERITANCE_CHAIN (primary_base) == b); | |
c35cce41 | 7990 | b = primary_base; |
b54ccf71 | 7991 | } |
73ea87d7 | 7992 | offset = size_diffop (BINFO_OFFSET (vid->rtti_binfo), BINFO_OFFSET (b)); |
8f032717 | 7993 | |
8fa33dfa MM |
7994 | /* The second entry is the address of the typeinfo object. */ |
7995 | if (flag_rtti) | |
7993382e | 7996 | decl = build_address (get_tinfo_decl (t)); |
ca36f057 | 7997 | else |
8fa33dfa | 7998 | decl = integer_zero_node; |
c8094d83 | 7999 | |
8fa33dfa MM |
8000 | /* Convert the declaration to a type that can be stored in the |
8001 | vtable. */ | |
7993382e | 8002 | init = build_nop (vfunc_ptr_type_node, decl); |
911a71a7 MM |
8003 | *vid->last_init = build_tree_list (NULL_TREE, init); |
8004 | vid->last_init = &TREE_CHAIN (*vid->last_init); | |
8f032717 | 8005 | |
78dcd41a VR |
8006 | /* Add the offset-to-top entry. It comes earlier in the vtable than |
8007 | the typeinfo entry. Convert the offset to look like a | |
c4372ef4 | 8008 | function pointer, so that we can put it in the vtable. */ |
7993382e | 8009 | init = build_nop (vfunc_ptr_type_node, offset); |
c4372ef4 NS |
8010 | *vid->last_init = build_tree_list (NULL_TREE, init); |
8011 | vid->last_init = &TREE_CHAIN (*vid->last_init); | |
8f032717 | 8012 | } |
0f59171d RH |
8013 | |
8014 | /* Fold a OBJ_TYPE_REF expression to the address of a function. | |
8015 | KNOWN_TYPE carries the true type of OBJ_TYPE_REF_OBJECT(REF). */ | |
8016 | ||
8017 | tree | |
8018 | cp_fold_obj_type_ref (tree ref, tree known_type) | |
8019 | { | |
8020 | HOST_WIDE_INT index = tree_low_cst (OBJ_TYPE_REF_TOKEN (ref), 1); | |
8021 | HOST_WIDE_INT i = 0; | |
604a3205 | 8022 | tree v = BINFO_VIRTUALS (TYPE_BINFO (known_type)); |
0f59171d RH |
8023 | tree fndecl; |
8024 | ||
8025 | while (i != index) | |
8026 | { | |
8027 | i += (TARGET_VTABLE_USES_DESCRIPTORS | |
8028 | ? TARGET_VTABLE_USES_DESCRIPTORS : 1); | |
8029 | v = TREE_CHAIN (v); | |
8030 | } | |
8031 | ||
8032 | fndecl = BV_FN (v); | |
8033 | ||
8034 | #ifdef ENABLE_CHECKING | |
8dc2b103 NS |
8035 | gcc_assert (tree_int_cst_equal (OBJ_TYPE_REF_TOKEN (ref), |
8036 | DECL_VINDEX (fndecl))); | |
0f59171d RH |
8037 | #endif |
8038 | ||
8634c649 JJ |
8039 | cgraph_node (fndecl)->local.vtable_method = true; |
8040 | ||
0f59171d RH |
8041 | return build_address (fndecl); |
8042 | } | |
d7afec4b | 8043 | |
1b746b0f | 8044 | #include "gt-cp-class.h" |