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8d08fdba | 1 | /* Functions related to building classes and their related objects. |
06ceef4e | 2 | Copyright (C) 1987, 1992, 1993, 1994, 1995, 1996, 1997, 1998, |
c9372112 | 3 | 1999, 2000, 2001, 2002, 2003 Free Software Foundation, Inc. |
8d08fdba MS |
4 | Contributed by Michael Tiemann (tiemann@cygnus.com) |
5 | ||
f5adbb8d | 6 | This file is part of GCC. |
8d08fdba | 7 | |
f5adbb8d | 8 | GCC is free software; you can redistribute it and/or modify |
8d08fdba MS |
9 | it under the terms of the GNU General Public License as published by |
10 | the Free Software Foundation; either version 2, or (at your option) | |
11 | any later version. | |
12 | ||
f5adbb8d | 13 | GCC is distributed in the hope that it will be useful, |
8d08fdba MS |
14 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | GNU General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU General Public License | |
f5adbb8d | 19 | along with GCC; see the file COPYING. If not, write to |
e9fa0c7c RK |
20 | the Free Software Foundation, 59 Temple Place - Suite 330, |
21 | Boston, MA 02111-1307, USA. */ | |
8d08fdba MS |
22 | |
23 | ||
e92cc029 | 24 | /* High-level class interface. */ |
8d08fdba MS |
25 | |
26 | #include "config.h" | |
8d052bc7 | 27 | #include "system.h" |
4977bab6 ZW |
28 | #include "coretypes.h" |
29 | #include "tm.h" | |
e7a587ef | 30 | #include "tree.h" |
8d08fdba MS |
31 | #include "cp-tree.h" |
32 | #include "flags.h" | |
28cbf42c | 33 | #include "rtl.h" |
e8abc66f | 34 | #include "output.h" |
54f92bfb | 35 | #include "toplev.h" |
11028a53 | 36 | #include "lex.h" |
1af6141b | 37 | #include "target.h" |
7b6d72fc | 38 | #include "convert.h" |
8d08fdba | 39 | |
61a127b3 MM |
40 | /* The number of nested classes being processed. If we are not in the |
41 | scope of any class, this is zero. */ | |
42 | ||
8d08fdba MS |
43 | int current_class_depth; |
44 | ||
61a127b3 MM |
45 | /* In order to deal with nested classes, we keep a stack of classes. |
46 | The topmost entry is the innermost class, and is the entry at index | |
47 | CURRENT_CLASS_DEPTH */ | |
48 | ||
49 | typedef struct class_stack_node { | |
50 | /* The name of the class. */ | |
51 | tree name; | |
52 | ||
53 | /* The _TYPE node for the class. */ | |
54 | tree type; | |
55 | ||
56 | /* The access specifier pending for new declarations in the scope of | |
57 | this class. */ | |
58 | tree access; | |
8f032717 MM |
59 | |
60 | /* If were defining TYPE, the names used in this class. */ | |
61 | splay_tree names_used; | |
61a127b3 MM |
62 | }* class_stack_node_t; |
63 | ||
911a71a7 | 64 | typedef struct vtbl_init_data_s |
c35cce41 | 65 | { |
911a71a7 MM |
66 | /* The base for which we're building initializers. */ |
67 | tree binfo; | |
73ea87d7 | 68 | /* The type of the most-derived type. */ |
c35cce41 | 69 | tree derived; |
73ea87d7 NS |
70 | /* The binfo for the dynamic type. This will be TYPE_BINFO (derived), |
71 | unless ctor_vtbl_p is true. */ | |
72 | tree rtti_binfo; | |
9bab6c90 MM |
73 | /* The negative-index vtable initializers built up so far. These |
74 | are in order from least negative index to most negative index. */ | |
75 | tree inits; | |
d0cd8b44 | 76 | /* The last (i.e., most negative) entry in INITS. */ |
9bab6c90 | 77 | tree* last_init; |
c35cce41 | 78 | /* The binfo for the virtual base for which we're building |
911a71a7 | 79 | vcall offset initializers. */ |
c35cce41 | 80 | tree vbase; |
9bab6c90 MM |
81 | /* The functions in vbase for which we have already provided vcall |
82 | offsets. */ | |
83 | varray_type fns; | |
c35cce41 MM |
84 | /* The vtable index of the next vcall or vbase offset. */ |
85 | tree index; | |
86 | /* Nonzero if we are building the initializer for the primary | |
87 | vtable. */ | |
911a71a7 MM |
88 | int primary_vtbl_p; |
89 | /* Nonzero if we are building the initializer for a construction | |
90 | vtable. */ | |
91 | int ctor_vtbl_p; | |
548502d3 MM |
92 | /* True when adding vcall offset entries to the vtable. False when |
93 | merely computing the indices. */ | |
94 | bool generate_vcall_entries; | |
911a71a7 | 95 | } vtbl_init_data; |
c35cce41 | 96 | |
c20118a8 | 97 | /* The type of a function passed to walk_subobject_offsets. */ |
94edc4ab | 98 | typedef int (*subobject_offset_fn) (tree, tree, splay_tree); |
c20118a8 | 99 | |
4639c5c6 | 100 | /* The stack itself. This is a dynamically resized array. The |
61a127b3 MM |
101 | number of elements allocated is CURRENT_CLASS_STACK_SIZE. */ |
102 | static int current_class_stack_size; | |
103 | static class_stack_node_t current_class_stack; | |
104 | ||
1f6e1acc AS |
105 | /* An array of all local classes present in this translation unit, in |
106 | declaration order. */ | |
107 | varray_type local_classes; | |
108 | ||
94edc4ab NN |
109 | static tree get_vfield_name (tree); |
110 | static void finish_struct_anon (tree); | |
111 | static tree get_vtable_name (tree); | |
112 | static tree get_basefndecls (tree, tree); | |
113 | static int build_primary_vtable (tree, tree); | |
dbbf88d1 | 114 | static int build_secondary_vtable (tree); |
94edc4ab NN |
115 | static void finish_vtbls (tree); |
116 | static void modify_vtable_entry (tree, tree, tree, tree, tree *); | |
117 | static tree delete_duplicate_fields_1 (tree, tree); | |
118 | static void delete_duplicate_fields (tree); | |
119 | static void finish_struct_bits (tree); | |
120 | static int alter_access (tree, tree, tree); | |
121 | static void handle_using_decl (tree, tree); | |
122 | static void check_for_override (tree, tree); | |
123 | static tree dfs_modify_vtables (tree, void *); | |
124 | static tree modify_all_vtables (tree, tree); | |
125 | static void determine_primary_base (tree); | |
126 | static void finish_struct_methods (tree); | |
127 | static void maybe_warn_about_overly_private_class (tree); | |
94edc4ab NN |
128 | static int method_name_cmp (const void *, const void *); |
129 | static int resort_method_name_cmp (const void *, const void *); | |
130 | static void add_implicitly_declared_members (tree, int, int, int); | |
131 | static tree fixed_type_or_null (tree, int *, int *); | |
92af500d NS |
132 | static tree resolve_address_of_overloaded_function (tree, tree, tsubst_flags_t, |
133 | bool, tree); | |
94edc4ab NN |
134 | static tree build_vtbl_ref_1 (tree, tree); |
135 | static tree build_vtbl_initializer (tree, tree, tree, tree, int *); | |
136 | static int count_fields (tree); | |
d07605f5 | 137 | static int add_fields_to_record_type (tree, struct sorted_fields_type*, int); |
94edc4ab | 138 | static void check_bitfield_decl (tree); |
58731fd1 MM |
139 | static void check_field_decl (tree, tree, int *, int *, int *, int *); |
140 | static void check_field_decls (tree, tree *, int *, int *, int *); | |
141 | static tree *build_base_field (record_layout_info, tree, splay_tree, tree *); | |
142 | static void build_base_fields (record_layout_info, splay_tree, tree *); | |
94edc4ab NN |
143 | static void check_methods (tree); |
144 | static void remove_zero_width_bit_fields (tree); | |
145 | static void check_bases (tree, int *, int *, int *); | |
58731fd1 MM |
146 | static void check_bases_and_members (tree); |
147 | static tree create_vtable_ptr (tree, tree *); | |
17bbb839 | 148 | static void include_empty_classes (record_layout_info); |
e93ee644 | 149 | static void layout_class_type (tree, tree *); |
94edc4ab NN |
150 | static void fixup_pending_inline (tree); |
151 | static void fixup_inline_methods (tree); | |
152 | static void set_primary_base (tree, tree); | |
dbbf88d1 | 153 | static void propagate_binfo_offsets (tree, tree); |
17bbb839 | 154 | static void layout_virtual_bases (record_layout_info, splay_tree); |
94edc4ab NN |
155 | static void build_vbase_offset_vtbl_entries (tree, vtbl_init_data *); |
156 | static void add_vcall_offset_vtbl_entries_r (tree, vtbl_init_data *); | |
157 | static void add_vcall_offset_vtbl_entries_1 (tree, vtbl_init_data *); | |
158 | static void build_vcall_offset_vtbl_entries (tree, vtbl_init_data *); | |
e6a66567 | 159 | static void add_vcall_offset (tree, tree, vtbl_init_data *); |
94edc4ab NN |
160 | static void layout_vtable_decl (tree, int); |
161 | static tree dfs_find_final_overrider (tree, void *); | |
dbbf88d1 NS |
162 | static tree dfs_find_final_overrider_post (tree, void *); |
163 | static tree dfs_find_final_overrider_q (tree, int, void *); | |
94edc4ab NN |
164 | static tree find_final_overrider (tree, tree, tree); |
165 | static int make_new_vtable (tree, tree); | |
166 | static int maybe_indent_hierarchy (FILE *, int, int); | |
dbbf88d1 | 167 | static tree dump_class_hierarchy_r (FILE *, int, tree, tree, int); |
94edc4ab | 168 | static void dump_class_hierarchy (tree); |
bb885938 | 169 | static void dump_class_hierarchy_1 (FILE *, int, tree); |
94edc4ab NN |
170 | static void dump_array (FILE *, tree); |
171 | static void dump_vtable (tree, tree, tree); | |
172 | static void dump_vtt (tree, tree); | |
bb885938 | 173 | static void dump_thunk (FILE *, int, tree); |
94edc4ab NN |
174 | static tree build_vtable (tree, tree, tree); |
175 | static void initialize_vtable (tree, tree); | |
176 | static void initialize_array (tree, tree); | |
177 | static void layout_nonempty_base_or_field (record_layout_info, | |
178 | tree, tree, splay_tree); | |
179 | static tree end_of_class (tree, int); | |
dbbf88d1 | 180 | static bool layout_empty_base (tree, tree, splay_tree); |
94edc4ab NN |
181 | static void accumulate_vtbl_inits (tree, tree, tree, tree, tree); |
182 | static tree dfs_accumulate_vtbl_inits (tree, tree, tree, tree, | |
183 | tree); | |
184 | static void build_rtti_vtbl_entries (tree, vtbl_init_data *); | |
185 | static void build_vcall_and_vbase_vtbl_entries (tree, | |
186 | vtbl_init_data *); | |
94edc4ab | 187 | static void mark_primary_bases (tree); |
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 tree copy_virtuals (tree); |
192 | static void build_ctor_vtbl_group (tree, tree); | |
193 | static void build_vtt (tree); | |
194 | static tree binfo_ctor_vtable (tree); | |
195 | static tree *build_vtt_inits (tree, tree, tree *, tree *); | |
196 | static tree dfs_build_secondary_vptr_vtt_inits (tree, void *); | |
dbbf88d1 | 197 | static tree dfs_ctor_vtable_bases_queue_p (tree, int, void *data); |
94edc4ab | 198 | static tree dfs_fixup_binfo_vtbls (tree, void *); |
94edc4ab NN |
199 | static int record_subobject_offset (tree, tree, splay_tree); |
200 | static int check_subobject_offset (tree, tree, splay_tree); | |
201 | static int walk_subobject_offsets (tree, subobject_offset_fn, | |
202 | tree, splay_tree, tree, int); | |
203 | static void record_subobject_offsets (tree, tree, splay_tree, int); | |
204 | static int layout_conflict_p (tree, tree, splay_tree, int); | |
205 | static int splay_tree_compare_integer_csts (splay_tree_key k1, | |
206 | splay_tree_key k2); | |
207 | static void warn_about_ambiguous_bases (tree); | |
208 | static bool type_requires_array_cookie (tree); | |
956d9305 | 209 | static bool contains_empty_class_p (tree); |
9368208b | 210 | static bool base_derived_from (tree, tree); |
7ba539c6 | 211 | static int empty_base_at_nonzero_offset_p (tree, tree, splay_tree); |
ba9a991f | 212 | static tree end_of_base (tree); |
548502d3 | 213 | static tree get_vcall_index (tree, tree); |
9965d119 NS |
214 | |
215 | /* Macros for dfs walking during vtt construction. See | |
216 | dfs_ctor_vtable_bases_queue_p, dfs_build_secondary_vptr_vtt_inits | |
217 | and dfs_fixup_binfo_vtbls. */ | |
12f50451 GS |
218 | #define VTT_TOP_LEVEL_P(NODE) TREE_UNSIGNED (NODE) |
219 | #define VTT_MARKED_BINFO_P(NODE) TREE_USED (NODE) | |
9965d119 | 220 | |
51c184be | 221 | /* Variables shared between class.c and call.c. */ |
8d08fdba | 222 | |
5566b478 | 223 | #ifdef GATHER_STATISTICS |
8d08fdba MS |
224 | int n_vtables = 0; |
225 | int n_vtable_entries = 0; | |
226 | int n_vtable_searches = 0; | |
227 | int n_vtable_elems = 0; | |
228 | int n_convert_harshness = 0; | |
229 | int n_compute_conversion_costs = 0; | |
230 | int n_build_method_call = 0; | |
231 | int n_inner_fields_searched = 0; | |
5566b478 | 232 | #endif |
8d08fdba | 233 | |
338d90b8 NS |
234 | /* Convert to or from a base subobject. EXPR is an expression of type |
235 | `A' or `A*', an expression of type `B' or `B*' is returned. To | |
236 | convert A to a base B, CODE is PLUS_EXPR and BINFO is the binfo for | |
237 | the B base instance within A. To convert base A to derived B, CODE | |
238 | is MINUS_EXPR and BINFO is the binfo for the A instance within B. | |
239 | In this latter case, A must not be a morally virtual base of B. | |
240 | NONNULL is true if EXPR is known to be non-NULL (this is only | |
241 | needed when EXPR is of pointer type). CV qualifiers are preserved | |
242 | from EXPR. */ | |
ca36f057 MM |
243 | |
244 | tree | |
94edc4ab NN |
245 | build_base_path (enum tree_code code, |
246 | tree expr, | |
247 | tree binfo, | |
248 | int nonnull) | |
1a588ad7 | 249 | { |
338d90b8 | 250 | tree v_binfo = NULL_TREE; |
6bc34b14 | 251 | tree d_binfo = NULL_TREE; |
338d90b8 NS |
252 | tree probe; |
253 | tree offset; | |
254 | tree target_type; | |
255 | tree null_test = NULL; | |
256 | tree ptr_target_type; | |
ca36f057 | 257 | int fixed_type_p; |
338d90b8 | 258 | int want_pointer = TREE_CODE (TREE_TYPE (expr)) == POINTER_TYPE; |
1a588ad7 | 259 | |
338d90b8 NS |
260 | if (expr == error_mark_node || binfo == error_mark_node || !binfo) |
261 | return error_mark_node; | |
6bc34b14 JM |
262 | |
263 | for (probe = binfo; probe; probe = BINFO_INHERITANCE_CHAIN (probe)) | |
264 | { | |
265 | d_binfo = probe; | |
266 | if (!v_binfo && TREE_VIA_VIRTUAL (probe)) | |
267 | v_binfo = probe; | |
268 | } | |
338d90b8 NS |
269 | |
270 | probe = TYPE_MAIN_VARIANT (TREE_TYPE (expr)); | |
271 | if (want_pointer) | |
272 | probe = TYPE_MAIN_VARIANT (TREE_TYPE (probe)); | |
273 | ||
274 | my_friendly_assert (code == MINUS_EXPR | |
275 | ? same_type_p (BINFO_TYPE (binfo), probe) | |
276 | : code == PLUS_EXPR | |
6bc34b14 | 277 | ? same_type_p (BINFO_TYPE (d_binfo), probe) |
338d90b8 NS |
278 | : false, 20010723); |
279 | ||
280 | if (code == MINUS_EXPR && v_binfo) | |
281 | { | |
33bd39a2 | 282 | error ("cannot convert from base `%T' to derived type `%T' via virtual base `%T'", |
6bc34b14 | 283 | BINFO_TYPE (binfo), BINFO_TYPE (d_binfo), BINFO_TYPE (v_binfo)); |
338d90b8 NS |
284 | return error_mark_node; |
285 | } | |
1a588ad7 | 286 | |
f576dfc4 JM |
287 | if (!want_pointer) |
288 | /* This must happen before the call to save_expr. */ | |
289 | expr = build_unary_op (ADDR_EXPR, expr, 0); | |
290 | ||
ca36f057 | 291 | fixed_type_p = resolves_to_fixed_type_p (expr, &nonnull); |
f2606a97 | 292 | if (fixed_type_p <= 0 && TREE_SIDE_EFFECTS (expr)) |
ca36f057 | 293 | expr = save_expr (expr); |
f2606a97 | 294 | |
f576dfc4 | 295 | if (want_pointer && !nonnull) |
338d90b8 NS |
296 | null_test = build (EQ_EXPR, boolean_type_node, expr, integer_zero_node); |
297 | ||
298 | offset = BINFO_OFFSET (binfo); | |
299 | ||
f2606a97 | 300 | if (v_binfo && fixed_type_p <= 0) |
1a588ad7 | 301 | { |
338d90b8 | 302 | /* Going via virtual base V_BINFO. We need the static offset |
6bc34b14 JM |
303 | from V_BINFO to BINFO, and the dynamic offset from D_BINFO to |
304 | V_BINFO. That offset is an entry in D_BINFO's vtable. */ | |
1f5a253a NS |
305 | tree v_offset; |
306 | ||
307 | if (fixed_type_p < 0 && in_base_initializer) | |
308 | { | |
309 | /* In a base member initializer, we cannot rely on | |
310 | the vtable being set up. We have to use the vtt_parm. */ | |
311 | tree derived = BINFO_INHERITANCE_CHAIN (v_binfo); | |
312 | ||
313 | v_offset = build (PLUS_EXPR, TREE_TYPE (current_vtt_parm), | |
314 | current_vtt_parm, BINFO_VPTR_INDEX (derived)); | |
315 | ||
316 | v_offset = build1 (INDIRECT_REF, | |
317 | TREE_TYPE (TYPE_VFIELD (BINFO_TYPE (derived))), | |
318 | v_offset); | |
319 | ||
320 | } | |
321 | else | |
322 | v_offset = build_vfield_ref (build_indirect_ref (expr, NULL), | |
323 | TREE_TYPE (TREE_TYPE (expr))); | |
338d90b8 | 324 | |
338d90b8 NS |
325 | v_offset = build (PLUS_EXPR, TREE_TYPE (v_offset), |
326 | v_offset, BINFO_VPTR_FIELD (v_binfo)); | |
327 | v_offset = build1 (NOP_EXPR, | |
328 | build_pointer_type (ptrdiff_type_node), | |
329 | v_offset); | |
330 | v_offset = build_indirect_ref (v_offset, NULL); | |
f63ab951 JM |
331 | TREE_CONSTANT (v_offset) = 1; |
332 | ||
7b6d72fc MM |
333 | offset = convert_to_integer (ptrdiff_type_node, |
334 | size_diffop (offset, | |
335 | BINFO_OFFSET (v_binfo))); | |
8d08fdba | 336 | |
338d90b8 | 337 | if (!integer_zerop (offset)) |
f2606a97 JM |
338 | v_offset = build (code, ptrdiff_type_node, v_offset, offset); |
339 | ||
340 | if (fixed_type_p < 0) | |
341 | /* Negative fixed_type_p means this is a constructor or destructor; | |
342 | virtual base layout is fixed in in-charge [cd]tors, but not in | |
343 | base [cd]tors. */ | |
344 | offset = build (COND_EXPR, ptrdiff_type_node, | |
345 | build (EQ_EXPR, boolean_type_node, | |
346 | current_in_charge_parm, integer_zero_node), | |
347 | v_offset, | |
348 | BINFO_OFFSET (binfo)); | |
338d90b8 NS |
349 | else |
350 | offset = v_offset; | |
8d08fdba | 351 | } |
8d08fdba | 352 | |
6bc34b14 | 353 | target_type = code == PLUS_EXPR ? BINFO_TYPE (binfo) : BINFO_TYPE (d_binfo); |
338d90b8 NS |
354 | |
355 | target_type = cp_build_qualified_type | |
356 | (target_type, cp_type_quals (TREE_TYPE (TREE_TYPE (expr)))); | |
357 | ptr_target_type = build_pointer_type (target_type); | |
358 | if (want_pointer) | |
359 | target_type = ptr_target_type; | |
360 | ||
361 | expr = build1 (NOP_EXPR, ptr_target_type, expr); | |
fed3cef0 | 362 | |
338d90b8 NS |
363 | if (!integer_zerop (offset)) |
364 | expr = build (code, ptr_target_type, expr, offset); | |
8d08fdba | 365 | else |
338d90b8 NS |
366 | null_test = NULL; |
367 | ||
368 | if (!want_pointer) | |
369 | expr = build_indirect_ref (expr, NULL); | |
8d08fdba | 370 | |
338d90b8 NS |
371 | if (null_test) |
372 | expr = build (COND_EXPR, target_type, null_test, | |
373 | build1 (NOP_EXPR, target_type, integer_zero_node), | |
374 | expr); | |
f2606a97 | 375 | |
338d90b8 | 376 | return expr; |
8d08fdba MS |
377 | } |
378 | ||
50ad9642 MM |
379 | /* Convert OBJECT to the base TYPE. If CHECK_ACCESS is true, an error |
380 | message is emitted if TYPE is inaccessible. OBJECT is assumed to | |
381 | be non-NULL. */ | |
382 | ||
383 | tree | |
384 | convert_to_base (tree object, tree type, bool check_access) | |
385 | { | |
386 | tree binfo; | |
387 | ||
388 | binfo = lookup_base (TREE_TYPE (object), type, | |
389 | check_access ? ba_check : ba_ignore, | |
390 | NULL); | |
5bfc90de | 391 | if (!binfo || binfo == error_mark_node) |
50ad9642 MM |
392 | return error_mark_node; |
393 | ||
394 | return build_base_path (PLUS_EXPR, object, binfo, /*nonnull=*/1); | |
395 | } | |
396 | ||
22ed7e5f MM |
397 | /* EXPR is an expression with class type. BASE is a base class (a |
398 | BINFO) of that class type. Returns EXPR, converted to the BASE | |
399 | type. This function assumes that EXPR is the most derived class; | |
400 | therefore virtual bases can be found at their static offsets. */ | |
401 | ||
402 | tree | |
403 | convert_to_base_statically (tree expr, tree base) | |
404 | { | |
405 | tree expr_type; | |
406 | ||
407 | expr_type = TREE_TYPE (expr); | |
408 | if (!same_type_p (expr_type, BINFO_TYPE (base))) | |
409 | { | |
410 | tree pointer_type; | |
411 | ||
412 | pointer_type = build_pointer_type (expr_type); | |
413 | expr = build_unary_op (ADDR_EXPR, expr, /*noconvert=*/1); | |
414 | if (!integer_zerop (BINFO_OFFSET (base))) | |
415 | expr = build (PLUS_EXPR, pointer_type, expr, | |
416 | build_nop (pointer_type, BINFO_OFFSET (base))); | |
417 | expr = build_nop (build_pointer_type (BINFO_TYPE (base)), expr); | |
418 | expr = build1 (INDIRECT_REF, BINFO_TYPE (base), expr); | |
419 | } | |
420 | ||
421 | return expr; | |
422 | } | |
423 | ||
f8361147 | 424 | \f |
8d08fdba | 425 | /* Given an object INSTANCE, return an expression which yields the |
67231816 RH |
426 | vtable element corresponding to INDEX. There are many special |
427 | cases for INSTANCE which we take care of here, mainly to avoid | |
428 | creating extra tree nodes when we don't have to. */ | |
e92cc029 | 429 | |
4a8d0c9c | 430 | static tree |
94edc4ab | 431 | build_vtbl_ref_1 (tree instance, tree idx) |
8d08fdba | 432 | { |
f63ab951 JM |
433 | tree aref; |
434 | tree vtbl = NULL_TREE; | |
8d08fdba | 435 | |
f63ab951 JM |
436 | /* Try to figure out what a reference refers to, and |
437 | access its virtual function table directly. */ | |
438 | ||
439 | int cdtorp = 0; | |
440 | tree fixed_type = fixed_type_or_null (instance, NULL, &cdtorp); | |
441 | ||
ee76b931 | 442 | tree basetype = non_reference (TREE_TYPE (instance)); |
8d08fdba | 443 | |
f63ab951 | 444 | if (fixed_type && !cdtorp) |
8d08fdba | 445 | { |
f63ab951 JM |
446 | tree binfo = lookup_base (fixed_type, basetype, |
447 | ba_ignore|ba_quiet, NULL); | |
448 | if (binfo) | |
449 | vtbl = BINFO_VTABLE (binfo); | |
450 | } | |
8d08fdba | 451 | |
f63ab951 | 452 | if (!vtbl) |
dbbf88d1 NS |
453 | vtbl = build_vfield_ref (instance, basetype); |
454 | ||
e3417fcd | 455 | assemble_external (vtbl); |
a1dd0d36 | 456 | |
8d08fdba | 457 | aref = build_array_ref (vtbl, idx); |
f63ab951 | 458 | TREE_CONSTANT (aref) = 1; |
8d08fdba | 459 | |
c4372ef4 | 460 | return aref; |
8d08fdba MS |
461 | } |
462 | ||
4a8d0c9c | 463 | tree |
94edc4ab | 464 | build_vtbl_ref (tree instance, tree idx) |
4a8d0c9c RH |
465 | { |
466 | tree aref = build_vtbl_ref_1 (instance, idx); | |
467 | ||
4a8d0c9c RH |
468 | return aref; |
469 | } | |
470 | ||
67231816 RH |
471 | /* Given an object INSTANCE, return an expression which yields a |
472 | function pointer corresponding to vtable element INDEX. */ | |
473 | ||
474 | tree | |
94edc4ab | 475 | build_vfn_ref (tree instance, tree idx) |
67231816 | 476 | { |
4a8d0c9c | 477 | tree aref = build_vtbl_ref_1 (instance, idx); |
67231816 RH |
478 | |
479 | /* When using function descriptors, the address of the | |
480 | vtable entry is treated as a function pointer. */ | |
481 | if (TARGET_VTABLE_USES_DESCRIPTORS) | |
4a8d0c9c | 482 | aref = build1 (NOP_EXPR, TREE_TYPE (aref), |
67231816 RH |
483 | build_unary_op (ADDR_EXPR, aref, /*noconvert=*/1)); |
484 | ||
485 | return aref; | |
486 | } | |
487 | ||
669ec2b4 JM |
488 | /* Return the name of the virtual function table (as an IDENTIFIER_NODE) |
489 | for the given TYPE. */ | |
490 | ||
491 | static tree | |
94edc4ab | 492 | get_vtable_name (tree type) |
669ec2b4 | 493 | { |
1f84ec23 | 494 | return mangle_vtbl_for_type (type); |
669ec2b4 JM |
495 | } |
496 | ||
497 | /* Return an IDENTIFIER_NODE for the name of the virtual table table | |
498 | for TYPE. */ | |
499 | ||
500 | tree | |
94edc4ab | 501 | get_vtt_name (tree type) |
669ec2b4 | 502 | { |
1f84ec23 | 503 | return mangle_vtt_for_type (type); |
669ec2b4 JM |
504 | } |
505 | ||
459c43ad MM |
506 | /* Create a VAR_DECL for a primary or secondary vtable for CLASS_TYPE. |
507 | (For a secondary vtable for B-in-D, CLASS_TYPE should be D, not B.) | |
508 | Use NAME for the name of the vtable, and VTABLE_TYPE for its type. */ | |
b9f39201 MM |
509 | |
510 | static tree | |
94edc4ab | 511 | build_vtable (tree class_type, tree name, tree vtable_type) |
b9f39201 MM |
512 | { |
513 | tree decl; | |
514 | ||
515 | decl = build_lang_decl (VAR_DECL, name, vtable_type); | |
90ecce3e JM |
516 | /* vtable names are already mangled; give them their DECL_ASSEMBLER_NAME |
517 | now to avoid confusion in mangle_decl. */ | |
518 | SET_DECL_ASSEMBLER_NAME (decl, name); | |
b9f39201 MM |
519 | DECL_CONTEXT (decl) = class_type; |
520 | DECL_ARTIFICIAL (decl) = 1; | |
521 | TREE_STATIC (decl) = 1; | |
b9f39201 | 522 | TREE_READONLY (decl) = 1; |
b9f39201 | 523 | DECL_VIRTUAL_P (decl) = 1; |
a6f5e048 | 524 | DECL_ALIGN (decl) = TARGET_VTABLE_ENTRY_ALIGN; |
d35543c0 | 525 | DECL_VTABLE_OR_VTT_P (decl) = 1; |
a6f5e048 | 526 | |
78d55cc8 JM |
527 | /* At one time the vtable info was grabbed 2 words at a time. This |
528 | fails on sparc unless you have 8-byte alignment. (tiemann) */ | |
529 | DECL_ALIGN (decl) = MAX (TYPE_ALIGN (double_type_node), | |
530 | DECL_ALIGN (decl)); | |
531 | ||
b9f39201 MM |
532 | import_export_vtable (decl, class_type, 0); |
533 | ||
534 | return decl; | |
535 | } | |
536 | ||
1aa4ccd4 NS |
537 | /* Get the VAR_DECL of the vtable for TYPE. TYPE need not be polymorphic, |
538 | or even complete. If this does not exist, create it. If COMPLETE is | |
838dfd8a | 539 | nonzero, then complete the definition of it -- that will render it |
1aa4ccd4 NS |
540 | impossible to actually build the vtable, but is useful to get at those |
541 | which are known to exist in the runtime. */ | |
542 | ||
7d52ae23 | 543 | tree |
94edc4ab | 544 | get_vtable_decl (tree type, int complete) |
1aa4ccd4 | 545 | { |
548502d3 MM |
546 | tree decl; |
547 | ||
548 | if (CLASSTYPE_VTABLES (type)) | |
549 | return CLASSTYPE_VTABLES (type); | |
1aa4ccd4 | 550 | |
d1a74aa7 | 551 | decl = build_vtable (type, get_vtable_name (type), vtbl_type_node); |
548502d3 MM |
552 | CLASSTYPE_VTABLES (type) = decl; |
553 | ||
1aa4ccd4 | 554 | if (complete) |
217f4eb9 MM |
555 | { |
556 | DECL_EXTERNAL (decl) = 1; | |
557 | cp_finish_decl (decl, NULL_TREE, NULL_TREE, 0); | |
558 | } | |
1aa4ccd4 | 559 | |
1aa4ccd4 NS |
560 | return decl; |
561 | } | |
562 | ||
aabb4cd6 MM |
563 | /* Returns a copy of the BINFO_VIRTUALS list in BINFO. The |
564 | BV_VCALL_INDEX for each entry is cleared. */ | |
565 | ||
566 | static tree | |
94edc4ab | 567 | copy_virtuals (tree binfo) |
aabb4cd6 MM |
568 | { |
569 | tree copies; | |
570 | tree t; | |
571 | ||
572 | copies = copy_list (BINFO_VIRTUALS (binfo)); | |
573 | for (t = copies; t; t = TREE_CHAIN (t)) | |
548502d3 | 574 | BV_VCALL_INDEX (t) = NULL_TREE; |
aabb4cd6 MM |
575 | |
576 | return copies; | |
577 | } | |
85a9a0a2 | 578 | |
28531dd0 MM |
579 | /* Build the primary virtual function table for TYPE. If BINFO is |
580 | non-NULL, build the vtable starting with the initial approximation | |
581 | that it is the same as the one which is the head of the association | |
838dfd8a | 582 | list. Returns a nonzero value if a new vtable is actually |
28531dd0 | 583 | created. */ |
e92cc029 | 584 | |
28531dd0 | 585 | static int |
94edc4ab | 586 | build_primary_vtable (tree binfo, tree type) |
8d08fdba | 587 | { |
31f8e4f3 MM |
588 | tree decl; |
589 | tree virtuals; | |
8d08fdba | 590 | |
1aa4ccd4 NS |
591 | decl = get_vtable_decl (type, /*complete=*/0); |
592 | ||
8d08fdba MS |
593 | if (binfo) |
594 | { | |
dbbf88d1 | 595 | if (BINFO_NEW_VTABLE_MARKED (binfo)) |
0533d788 MM |
596 | /* We have already created a vtable for this base, so there's |
597 | no need to do it again. */ | |
28531dd0 MM |
598 | return 0; |
599 | ||
aabb4cd6 | 600 | virtuals = copy_virtuals (binfo); |
c35cce41 MM |
601 | TREE_TYPE (decl) = TREE_TYPE (get_vtbl_decl_for_binfo (binfo)); |
602 | DECL_SIZE (decl) = TYPE_SIZE (TREE_TYPE (decl)); | |
603 | DECL_SIZE_UNIT (decl) = TYPE_SIZE_UNIT (TREE_TYPE (decl)); | |
8d08fdba MS |
604 | } |
605 | else | |
606 | { | |
d1a74aa7 | 607 | my_friendly_assert (TREE_TYPE (decl) == vtbl_type_node, 20000118); |
8d08fdba | 608 | virtuals = NULL_TREE; |
8d08fdba MS |
609 | } |
610 | ||
611 | #ifdef GATHER_STATISTICS | |
612 | n_vtables += 1; | |
613 | n_vtable_elems += list_length (virtuals); | |
614 | #endif | |
615 | ||
8d08fdba MS |
616 | /* Initialize the association list for this type, based |
617 | on our first approximation. */ | |
618 | TYPE_BINFO_VTABLE (type) = decl; | |
619 | TYPE_BINFO_VIRTUALS (type) = virtuals; | |
dbbf88d1 | 620 | SET_BINFO_NEW_VTABLE_MARKED (TYPE_BINFO (type)); |
28531dd0 | 621 | return 1; |
8d08fdba MS |
622 | } |
623 | ||
3461fba7 | 624 | /* Give BINFO a new virtual function table which is initialized |
8d08fdba MS |
625 | with a skeleton-copy of its original initialization. The only |
626 | entry that changes is the `delta' entry, so we can really | |
627 | share a lot of structure. | |
628 | ||
3461fba7 | 629 | FOR_TYPE is the most derived type which caused this table to |
8d08fdba MS |
630 | be needed. |
631 | ||
838dfd8a | 632 | Returns nonzero if we haven't met BINFO before. |
2636fde4 JM |
633 | |
634 | The order in which vtables are built (by calling this function) for | |
635 | an object must remain the same, otherwise a binary incompatibility | |
636 | can result. */ | |
e92cc029 | 637 | |
28531dd0 | 638 | static int |
dbbf88d1 | 639 | build_secondary_vtable (tree binfo) |
8d08fdba | 640 | { |
dbbf88d1 | 641 | if (BINFO_NEW_VTABLE_MARKED (binfo)) |
0533d788 MM |
642 | /* We already created a vtable for this base. There's no need to |
643 | do it again. */ | |
28531dd0 | 644 | return 0; |
0533d788 | 645 | |
8d7a5379 MM |
646 | /* Remember that we've created a vtable for this BINFO, so that we |
647 | don't try to do so again. */ | |
dbbf88d1 | 648 | SET_BINFO_NEW_VTABLE_MARKED (binfo); |
8d7a5379 MM |
649 | |
650 | /* Make fresh virtual list, so we can smash it later. */ | |
aabb4cd6 | 651 | BINFO_VIRTUALS (binfo) = copy_virtuals (binfo); |
8d7a5379 | 652 | |
3461fba7 NS |
653 | /* Secondary vtables are laid out as part of the same structure as |
654 | the primary vtable. */ | |
655 | BINFO_VTABLE (binfo) = NULL_TREE; | |
28531dd0 | 656 | return 1; |
8d08fdba MS |
657 | } |
658 | ||
28531dd0 | 659 | /* Create a new vtable for BINFO which is the hierarchy dominated by |
838dfd8a | 660 | T. Return nonzero if we actually created a new vtable. */ |
28531dd0 MM |
661 | |
662 | static int | |
94edc4ab | 663 | make_new_vtable (tree t, tree binfo) |
28531dd0 MM |
664 | { |
665 | if (binfo == TYPE_BINFO (t)) | |
666 | /* In this case, it is *type*'s vtable we are modifying. We start | |
d0cd8b44 | 667 | with the approximation that its vtable is that of the |
28531dd0 | 668 | immediate base class. */ |
d0cd8b44 JM |
669 | /* ??? This actually passes TYPE_BINFO (t), not the primary base binfo, |
670 | since we've updated DECL_CONTEXT (TYPE_VFIELD (t)) by now. */ | |
671 | return build_primary_vtable (TYPE_BINFO (DECL_CONTEXT (TYPE_VFIELD (t))), | |
28531dd0 MM |
672 | t); |
673 | else | |
674 | /* This is our very own copy of `basetype' to play with. Later, | |
675 | we will fill in all the virtual functions that override the | |
676 | virtual functions in these base classes which are not defined | |
677 | by the current type. */ | |
dbbf88d1 | 678 | return build_secondary_vtable (binfo); |
28531dd0 MM |
679 | } |
680 | ||
681 | /* Make *VIRTUALS, an entry on the BINFO_VIRTUALS list for BINFO | |
682 | (which is in the hierarchy dominated by T) list FNDECL as its | |
4e7512c9 MM |
683 | BV_FN. DELTA is the required constant adjustment from the `this' |
684 | pointer where the vtable entry appears to the `this' required when | |
685 | the function is actually called. */ | |
8d08fdba MS |
686 | |
687 | static void | |
94edc4ab NN |
688 | modify_vtable_entry (tree t, |
689 | tree binfo, | |
690 | tree fndecl, | |
691 | tree delta, | |
dbbf88d1 | 692 | tree *virtuals) |
8d08fdba | 693 | { |
28531dd0 | 694 | tree v; |
c0bbf652 | 695 | |
28531dd0 | 696 | v = *virtuals; |
c0bbf652 | 697 | |
5e19c053 | 698 | if (fndecl != BV_FN (v) |
4e7512c9 | 699 | || !tree_int_cst_equal (delta, BV_DELTA (v))) |
c0bbf652 | 700 | { |
28531dd0 MM |
701 | /* We need a new vtable for BINFO. */ |
702 | if (make_new_vtable (t, binfo)) | |
703 | { | |
704 | /* If we really did make a new vtable, we also made a copy | |
705 | of the BINFO_VIRTUALS list. Now, we have to find the | |
706 | corresponding entry in that list. */ | |
707 | *virtuals = BINFO_VIRTUALS (binfo); | |
5e19c053 | 708 | while (BV_FN (*virtuals) != BV_FN (v)) |
28531dd0 MM |
709 | *virtuals = TREE_CHAIN (*virtuals); |
710 | v = *virtuals; | |
711 | } | |
8d08fdba | 712 | |
5e19c053 | 713 | BV_DELTA (v) = delta; |
aabb4cd6 | 714 | BV_VCALL_INDEX (v) = NULL_TREE; |
5e19c053 | 715 | BV_FN (v) = fndecl; |
8d08fdba | 716 | } |
8d08fdba MS |
717 | } |
718 | ||
8d08fdba | 719 | \f |
452a394b MM |
720 | /* Add method METHOD to class TYPE. If ERROR_P is true, we are adding |
721 | the method after the class has already been defined because a | |
722 | declaration for it was seen. (Even though that is erroneous, we | |
723 | add the method for improved error recovery.) */ | |
e92cc029 | 724 | |
8d08fdba | 725 | void |
94edc4ab | 726 | add_method (tree type, tree method, int error_p) |
8d08fdba | 727 | { |
aa52c1ff | 728 | int using = (DECL_CONTEXT (method) != type); |
452a394b MM |
729 | int len; |
730 | int slot; | |
731 | tree method_vec; | |
5dd236e2 NS |
732 | int template_conv_p = (TREE_CODE (method) == TEMPLATE_DECL |
733 | && DECL_TEMPLATE_CONV_FN_P (method)); | |
452a394b MM |
734 | |
735 | if (!CLASSTYPE_METHOD_VEC (type)) | |
736 | /* Make a new method vector. We start with 8 entries. We must | |
737 | allocate at least two (for constructors and destructors), and | |
738 | we're going to end up with an assignment operator at some point | |
739 | as well. | |
740 | ||
741 | We could use a TREE_LIST for now, and convert it to a TREE_VEC | |
742 | in finish_struct, but we would probably waste more memory | |
743 | making the links in the list than we would by over-allocating | |
744 | the size of the vector here. Furthermore, we would complicate | |
745 | all the code that expects this to be a vector. */ | |
746 | CLASSTYPE_METHOD_VEC (type) = make_tree_vec (8); | |
747 | ||
748 | method_vec = CLASSTYPE_METHOD_VEC (type); | |
749 | len = TREE_VEC_LENGTH (method_vec); | |
750 | ||
751 | /* Constructors and destructors go in special slots. */ | |
752 | if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (method)) | |
753 | slot = CLASSTYPE_CONSTRUCTOR_SLOT; | |
754 | else if (DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P (method)) | |
4b0d3cbe MM |
755 | { |
756 | slot = CLASSTYPE_DESTRUCTOR_SLOT; | |
757 | TYPE_HAS_DESTRUCTOR (type) = 1; | |
f5c28a15 NS |
758 | |
759 | if (TYPE_FOR_JAVA (type)) | |
760 | error (DECL_ARTIFICIAL (method) | |
761 | ? "Java class '%T' cannot have an implicit non-trivial destructor" | |
762 | : "Java class '%T' cannot have a destructor", | |
763 | DECL_CONTEXT (method)); | |
4b0d3cbe | 764 | } |
452a394b | 765 | else |
61a127b3 | 766 | { |
5dd236e2 NS |
767 | int have_template_convs_p = 0; |
768 | ||
452a394b MM |
769 | /* See if we already have an entry with this name. */ |
770 | for (slot = CLASSTYPE_FIRST_CONVERSION_SLOT; slot < len; ++slot) | |
5dd236e2 NS |
771 | { |
772 | tree m = TREE_VEC_ELT (method_vec, slot); | |
773 | ||
774 | if (!m) | |
775 | break; | |
776 | m = OVL_CURRENT (m); | |
777 | ||
778 | if (template_conv_p) | |
779 | { | |
780 | have_template_convs_p = (TREE_CODE (m) == TEMPLATE_DECL | |
781 | && DECL_TEMPLATE_CONV_FN_P (m)); | |
782 | ||
783 | /* If we need to move things up, see if there's | |
00a17e31 | 784 | space. */ |
5dd236e2 NS |
785 | if (!have_template_convs_p) |
786 | { | |
787 | slot = len - 1; | |
788 | if (TREE_VEC_ELT (method_vec, slot)) | |
789 | slot++; | |
790 | } | |
791 | break; | |
792 | } | |
793 | if (DECL_NAME (m) == DECL_NAME (method)) | |
794 | break; | |
795 | } | |
796 | ||
452a394b MM |
797 | if (slot == len) |
798 | { | |
799 | /* We need a bigger method vector. */ | |
800 | int new_len; | |
801 | tree new_vec; | |
802 | ||
803 | /* In the non-error case, we are processing a class | |
804 | definition. Double the size of the vector to give room | |
805 | for new methods. */ | |
806 | if (!error_p) | |
807 | new_len = 2 * len; | |
808 | /* In the error case, the vector is already complete. We | |
809 | don't expect many errors, and the rest of the front-end | |
810 | will get confused if there are empty slots in the vector. */ | |
811 | else | |
812 | new_len = len + 1; | |
813 | ||
814 | new_vec = make_tree_vec (new_len); | |
730e1556 KG |
815 | memcpy (&TREE_VEC_ELT (new_vec, 0), &TREE_VEC_ELT (method_vec, 0), |
816 | len * sizeof (tree)); | |
452a394b MM |
817 | len = new_len; |
818 | method_vec = CLASSTYPE_METHOD_VEC (type) = new_vec; | |
819 | } | |
61a127b3 | 820 | |
452a394b MM |
821 | if (DECL_CONV_FN_P (method) && !TREE_VEC_ELT (method_vec, slot)) |
822 | { | |
823 | /* Type conversion operators have to come before ordinary | |
824 | methods; add_conversions depends on this to speed up | |
825 | looking for conversion operators. So, if necessary, we | |
826 | slide some of the vector elements up. In theory, this | |
827 | makes this algorithm O(N^2) but we don't expect many | |
828 | conversion operators. */ | |
5dd236e2 NS |
829 | if (template_conv_p) |
830 | slot = CLASSTYPE_FIRST_CONVERSION_SLOT; | |
831 | else | |
832 | for (slot = CLASSTYPE_FIRST_CONVERSION_SLOT; slot < len; ++slot) | |
833 | { | |
834 | tree fn = TREE_VEC_ELT (method_vec, slot); | |
03017874 | 835 | |
5dd236e2 NS |
836 | if (!fn) |
837 | /* There are no more entries in the vector, so we | |
838 | can insert the new conversion operator here. */ | |
839 | break; | |
03017874 | 840 | |
5dd236e2 NS |
841 | if (!DECL_CONV_FN_P (OVL_CURRENT (fn))) |
842 | /* We can insert the new function right at the | |
843 | SLOTth position. */ | |
844 | break; | |
845 | } | |
846 | ||
847 | if (template_conv_p && have_template_convs_p) | |
848 | /*OK*/; | |
849 | else if (!TREE_VEC_ELT (method_vec, slot)) | |
452a394b MM |
850 | /* There is nothing in the Ith slot, so we can avoid |
851 | moving anything. */ | |
61a127b3 | 852 | ; |
452a394b MM |
853 | else |
854 | { | |
855 | /* We know the last slot in the vector is empty | |
856 | because we know that at this point there's room | |
857 | for a new function. */ | |
730e1556 KG |
858 | memmove (&TREE_VEC_ELT (method_vec, slot + 1), |
859 | &TREE_VEC_ELT (method_vec, slot), | |
860 | (len - slot - 1) * sizeof (tree)); | |
452a394b | 861 | TREE_VEC_ELT (method_vec, slot) = NULL_TREE; |
8d08fdba | 862 | } |
61a127b3 | 863 | } |
452a394b | 864 | } |
61a127b3 | 865 | |
452a394b MM |
866 | if (template_class_depth (type)) |
867 | /* TYPE is a template class. Don't issue any errors now; wait | |
868 | until instantiation time to complain. */ | |
869 | ; | |
870 | else | |
871 | { | |
872 | tree fns; | |
03017874 | 873 | |
452a394b MM |
874 | /* Check to see if we've already got this method. */ |
875 | for (fns = TREE_VEC_ELT (method_vec, slot); | |
876 | fns; | |
877 | fns = OVL_NEXT (fns)) | |
878 | { | |
879 | tree fn = OVL_CURRENT (fns); | |
f0ab6bf2 MM |
880 | tree parms1; |
881 | tree parms2; | |
882 | bool same = 1; | |
883 | ||
452a394b MM |
884 | if (TREE_CODE (fn) != TREE_CODE (method)) |
885 | continue; | |
03017874 | 886 | |
f0ab6bf2 MM |
887 | /* [over.load] Member function declarations with the |
888 | same name and the same parameter types cannot be | |
889 | overloaded if any of them is a static member | |
890 | function declaration. | |
891 | ||
892 | [namespace.udecl] When a using-declaration brings names | |
893 | from a base class into a derived class scope, member | |
894 | functions in the derived class override and/or hide member | |
895 | functions with the same name and parameter types in a base | |
896 | class (rather than conflicting). */ | |
897 | parms1 = TYPE_ARG_TYPES (TREE_TYPE (fn)); | |
898 | parms2 = TYPE_ARG_TYPES (TREE_TYPE (method)); | |
899 | ||
900 | /* Compare the quals on the 'this' parm. Don't compare | |
901 | the whole types, as used functions are treated as | |
902 | coming from the using class in overload resolution. */ | |
903 | if (! DECL_STATIC_FUNCTION_P (fn) | |
904 | && ! DECL_STATIC_FUNCTION_P (method) | |
905 | && (TYPE_QUALS (TREE_TYPE (TREE_VALUE (parms1))) | |
906 | != TYPE_QUALS (TREE_TYPE (TREE_VALUE (parms2))))) | |
907 | same = 0; | |
8a188e24 NS |
908 | |
909 | /* For templates, the template parms must be identical. */ | |
910 | if (TREE_CODE (fn) == TEMPLATE_DECL | |
911 | && !comp_template_parms (DECL_TEMPLATE_PARMS (fn), | |
912 | DECL_TEMPLATE_PARMS (method))) | |
913 | same = 0; | |
914 | ||
f0ab6bf2 MM |
915 | if (! DECL_STATIC_FUNCTION_P (fn)) |
916 | parms1 = TREE_CHAIN (parms1); | |
917 | if (! DECL_STATIC_FUNCTION_P (method)) | |
918 | parms2 = TREE_CHAIN (parms2); | |
919 | ||
04ec0065 MM |
920 | if (same && compparms (parms1, parms2) |
921 | && (!DECL_CONV_FN_P (fn) | |
922 | || same_type_p (TREE_TYPE (TREE_TYPE (fn)), | |
923 | TREE_TYPE (TREE_TYPE (method))))) | |
452a394b | 924 | { |
f0ab6bf2 MM |
925 | if (using && DECL_CONTEXT (fn) == type) |
926 | /* Defer to the local function. */ | |
927 | return; | |
928 | else | |
03017874 | 929 | { |
f0ab6bf2 | 930 | cp_error_at ("`%#D' and `%#D' cannot be overloaded", |
04d6ccbd | 931 | method, fn); |
f0ab6bf2 MM |
932 | |
933 | /* We don't call duplicate_decls here to merge | |
934 | the declarations because that will confuse | |
935 | things if the methods have inline | |
936 | definitions. In particular, we will crash | |
937 | while processing the definitions. */ | |
938 | return; | |
03017874 | 939 | } |
452a394b | 940 | } |
03017874 | 941 | } |
452a394b | 942 | } |
03017874 | 943 | |
452a394b MM |
944 | /* Actually insert the new method. */ |
945 | TREE_VEC_ELT (method_vec, slot) | |
946 | = build_overload (method, TREE_VEC_ELT (method_vec, slot)); | |
8f032717 | 947 | |
5dd236e2 | 948 | /* Add the new binding. */ |
452a394b MM |
949 | if (!DECL_CONSTRUCTOR_P (method) |
950 | && !DECL_DESTRUCTOR_P (method)) | |
951 | push_class_level_binding (DECL_NAME (method), | |
952 | TREE_VEC_ELT (method_vec, slot)); | |
8d08fdba MS |
953 | } |
954 | ||
955 | /* Subroutines of finish_struct. */ | |
956 | ||
957 | /* Look through the list of fields for this struct, deleting | |
958 | duplicates as we go. This must be recursive to handle | |
959 | anonymous unions. | |
960 | ||
961 | FIELD is the field which may not appear anywhere in FIELDS. | |
962 | FIELD_PTR, if non-null, is the starting point at which | |
963 | chained deletions may take place. | |
964 | The value returned is the first acceptable entry found | |
965 | in FIELDS. | |
966 | ||
967 | Note that anonymous fields which are not of UNION_TYPE are | |
968 | not duplicates, they are just anonymous fields. This happens | |
969 | when we have unnamed bitfields, for example. */ | |
e92cc029 | 970 | |
8d08fdba | 971 | static tree |
94edc4ab | 972 | delete_duplicate_fields_1 (tree field, tree fields) |
8d08fdba MS |
973 | { |
974 | tree x; | |
00595019 | 975 | tree prev = 0; |
8d08fdba MS |
976 | if (DECL_NAME (field) == 0) |
977 | { | |
6bdb8141 | 978 | if (! ANON_AGGR_TYPE_P (TREE_TYPE (field))) |
8d08fdba MS |
979 | return fields; |
980 | ||
981 | for (x = TYPE_FIELDS (TREE_TYPE (field)); x; x = TREE_CHAIN (x)) | |
00595019 | 982 | fields = delete_duplicate_fields_1 (x, fields); |
8d08fdba MS |
983 | return fields; |
984 | } | |
985 | else | |
986 | { | |
987 | for (x = fields; x; prev = x, x = TREE_CHAIN (x)) | |
988 | { | |
989 | if (DECL_NAME (x) == 0) | |
990 | { | |
6bdb8141 | 991 | if (! ANON_AGGR_TYPE_P (TREE_TYPE (x))) |
8d08fdba MS |
992 | continue; |
993 | TYPE_FIELDS (TREE_TYPE (x)) | |
00595019 | 994 | = delete_duplicate_fields_1 (field, TYPE_FIELDS (TREE_TYPE (x))); |
8d08fdba MS |
995 | if (TYPE_FIELDS (TREE_TYPE (x)) == 0) |
996 | { | |
997 | if (prev == 0) | |
998 | fields = TREE_CHAIN (fields); | |
999 | else | |
1000 | TREE_CHAIN (prev) = TREE_CHAIN (x); | |
1001 | } | |
1002 | } | |
58010b57 | 1003 | else if (TREE_CODE (field) == USING_DECL) |
3ad97789 | 1004 | /* A using declaration is allowed to appear more than |
58010b57 MM |
1005 | once. We'll prune these from the field list later, and |
1006 | handle_using_decl will complain about invalid multiple | |
1007 | uses. */ | |
1008 | ; | |
1009 | else if (DECL_NAME (field) == DECL_NAME (x)) | |
8d08fdba | 1010 | { |
58010b57 MM |
1011 | if (TREE_CODE (field) == CONST_DECL |
1012 | && TREE_CODE (x) == CONST_DECL) | |
1013 | cp_error_at ("duplicate enum value `%D'", x); | |
1014 | else if (TREE_CODE (field) == CONST_DECL | |
1015 | || TREE_CODE (x) == CONST_DECL) | |
1016 | cp_error_at ("duplicate field `%D' (as enum and non-enum)", | |
1017 | x); | |
1018 | else if (DECL_DECLARES_TYPE_P (field) | |
1019 | && DECL_DECLARES_TYPE_P (x)) | |
8d08fdba | 1020 | { |
58010b57 MM |
1021 | if (same_type_p (TREE_TYPE (field), TREE_TYPE (x))) |
1022 | continue; | |
1023 | cp_error_at ("duplicate nested type `%D'", x); | |
8d08fdba | 1024 | } |
58010b57 MM |
1025 | else if (DECL_DECLARES_TYPE_P (field) |
1026 | || DECL_DECLARES_TYPE_P (x)) | |
1027 | { | |
1028 | /* Hide tag decls. */ | |
1029 | if ((TREE_CODE (field) == TYPE_DECL | |
1030 | && DECL_ARTIFICIAL (field)) | |
1031 | || (TREE_CODE (x) == TYPE_DECL | |
1032 | && DECL_ARTIFICIAL (x))) | |
1033 | continue; | |
1034 | cp_error_at ("duplicate field `%D' (as type and non-type)", | |
1035 | x); | |
1036 | } | |
1037 | else | |
1038 | cp_error_at ("duplicate member `%D'", x); | |
1039 | if (prev == 0) | |
1040 | fields = TREE_CHAIN (fields); | |
1041 | else | |
1042 | TREE_CHAIN (prev) = TREE_CHAIN (x); | |
8d08fdba MS |
1043 | } |
1044 | } | |
1045 | } | |
1046 | return fields; | |
1047 | } | |
1048 | ||
1049 | static void | |
94edc4ab | 1050 | delete_duplicate_fields (tree fields) |
8d08fdba MS |
1051 | { |
1052 | tree x; | |
1053 | for (x = fields; x && TREE_CHAIN (x); x = TREE_CHAIN (x)) | |
00595019 | 1054 | TREE_CHAIN (x) = delete_duplicate_fields_1 (x, TREE_CHAIN (x)); |
8d08fdba MS |
1055 | } |
1056 | ||
aa52c1ff JM |
1057 | /* Change the access of FDECL to ACCESS in T. Return 1 if change was |
1058 | legit, otherwise return 0. */ | |
e92cc029 | 1059 | |
8d08fdba | 1060 | static int |
94edc4ab | 1061 | alter_access (tree t, tree fdecl, tree access) |
8d08fdba | 1062 | { |
721c3b42 MM |
1063 | tree elem; |
1064 | ||
1065 | if (!DECL_LANG_SPECIFIC (fdecl)) | |
1066 | retrofit_lang_decl (fdecl); | |
1067 | ||
6df5158a | 1068 | my_friendly_assert (!DECL_DISCRIMINATOR_P (fdecl), 20030624); |
8e4ce833 | 1069 | |
721c3b42 | 1070 | elem = purpose_member (t, DECL_ACCESS (fdecl)); |
38afd588 | 1071 | if (elem) |
8d08fdba | 1072 | { |
38afd588 | 1073 | if (TREE_VALUE (elem) != access) |
8d08fdba | 1074 | { |
38afd588 | 1075 | if (TREE_CODE (TREE_TYPE (fdecl)) == FUNCTION_DECL) |
8251199e | 1076 | cp_error_at ("conflicting access specifications for method `%D', ignored", TREE_TYPE (fdecl)); |
38afd588 | 1077 | else |
8251199e | 1078 | error ("conflicting access specifications for field `%s', ignored", |
38afd588 | 1079 | IDENTIFIER_POINTER (DECL_NAME (fdecl))); |
8d08fdba MS |
1080 | } |
1081 | else | |
430bb96b JL |
1082 | { |
1083 | /* They're changing the access to the same thing they changed | |
1084 | it to before. That's OK. */ | |
1085 | ; | |
1086 | } | |
db5ae43f | 1087 | } |
38afd588 | 1088 | else |
8d08fdba | 1089 | { |
6df5158a | 1090 | perform_or_defer_access_check (TYPE_BINFO (t), fdecl); |
be99da77 | 1091 | DECL_ACCESS (fdecl) = tree_cons (t, access, DECL_ACCESS (fdecl)); |
8d08fdba MS |
1092 | return 1; |
1093 | } | |
1094 | return 0; | |
1095 | } | |
1096 | ||
58010b57 | 1097 | /* Process the USING_DECL, which is a member of T. */ |
79ad62b2 | 1098 | |
e9659ab0 | 1099 | static void |
94edc4ab | 1100 | handle_using_decl (tree using_decl, tree t) |
79ad62b2 MM |
1101 | { |
1102 | tree ctype = DECL_INITIAL (using_decl); | |
1103 | tree name = DECL_NAME (using_decl); | |
1104 | tree access | |
1105 | = TREE_PRIVATE (using_decl) ? access_private_node | |
1106 | : TREE_PROTECTED (using_decl) ? access_protected_node | |
1107 | : access_public_node; | |
1108 | tree fdecl, binfo; | |
1109 | tree flist = NULL_TREE; | |
aa52c1ff | 1110 | tree old_value; |
79ad62b2 | 1111 | |
3cedc9d8 MM |
1112 | if (ctype == error_mark_node) |
1113 | return; | |
1114 | ||
982216be | 1115 | binfo = lookup_base (t, ctype, ba_any, NULL); |
79ad62b2 | 1116 | if (! binfo) |
982216be | 1117 | { |
441b941a KL |
1118 | location_t saved_loc = input_location; |
1119 | ||
1120 | input_location = DECL_SOURCE_LOCATION (using_decl); | |
d9a50301 | 1121 | error_not_base_type (ctype, t); |
441b941a | 1122 | input_location = saved_loc; |
982216be MM |
1123 | return; |
1124 | } | |
79ad62b2 | 1125 | |
8ba658ee | 1126 | if (constructor_name_p (name, ctype)) |
2036a15c | 1127 | { |
186c0fbe NS |
1128 | cp_error_at ("`%D' names constructor", using_decl); |
1129 | return; | |
1130 | } | |
8ba658ee | 1131 | if (constructor_name_p (name, t)) |
186c0fbe NS |
1132 | { |
1133 | cp_error_at ("`%D' invalid in `%T'", using_decl, t); | |
2036a15c MM |
1134 | return; |
1135 | } | |
1136 | ||
86ac0575 | 1137 | fdecl = lookup_member (binfo, name, 0, false); |
79ad62b2 MM |
1138 | |
1139 | if (!fdecl) | |
1140 | { | |
8251199e | 1141 | cp_error_at ("no members matching `%D' in `%#T'", using_decl, ctype); |
79ad62b2 MM |
1142 | return; |
1143 | } | |
1144 | ||
aa52c1ff | 1145 | if (BASELINK_P (fdecl)) |
00a17e31 | 1146 | /* Ignore base type this came from. */ |
da15dae6 | 1147 | fdecl = BASELINK_FUNCTIONS (fdecl); |
79ad62b2 | 1148 | |
aa52c1ff JM |
1149 | old_value = IDENTIFIER_CLASS_VALUE (name); |
1150 | if (old_value) | |
79ad62b2 | 1151 | { |
aa52c1ff JM |
1152 | if (is_overloaded_fn (old_value)) |
1153 | old_value = OVL_CURRENT (old_value); | |
1154 | ||
1155 | if (DECL_P (old_value) && DECL_CONTEXT (old_value) == t) | |
1156 | /* OK */; | |
1157 | else | |
1158 | old_value = NULL_TREE; | |
79ad62b2 | 1159 | } |
1c35f5b6 | 1160 | |
aa52c1ff JM |
1161 | if (is_overloaded_fn (fdecl)) |
1162 | flist = fdecl; | |
aa52c1ff JM |
1163 | |
1164 | if (! old_value) | |
1165 | ; | |
1166 | else if (is_overloaded_fn (old_value)) | |
79ad62b2 | 1167 | { |
aa52c1ff JM |
1168 | if (flist) |
1169 | /* It's OK to use functions from a base when there are functions with | |
1170 | the same name already present in the current class. */; | |
1171 | else | |
79ad62b2 | 1172 | { |
186c0fbe | 1173 | cp_error_at ("`%D' invalid in `%#T'", using_decl, t); |
aa52c1ff JM |
1174 | cp_error_at (" because of local method `%#D' with same name", |
1175 | OVL_CURRENT (old_value)); | |
1176 | return; | |
79ad62b2 MM |
1177 | } |
1178 | } | |
186c0fbe | 1179 | else if (!DECL_ARTIFICIAL (old_value)) |
aa52c1ff | 1180 | { |
186c0fbe NS |
1181 | cp_error_at ("`%D' invalid in `%#T'", using_decl, t); |
1182 | cp_error_at (" because of local member `%#D' with same name", old_value); | |
aa52c1ff JM |
1183 | return; |
1184 | } | |
1185 | ||
1186 | /* Make type T see field decl FDECL with access ACCESS.*/ | |
1187 | if (flist) | |
1188 | for (; flist; flist = OVL_NEXT (flist)) | |
1189 | { | |
452a394b | 1190 | add_method (t, OVL_CURRENT (flist), /*error_p=*/0); |
aa52c1ff JM |
1191 | alter_access (t, OVL_CURRENT (flist), access); |
1192 | } | |
1193 | else | |
1194 | alter_access (t, fdecl, access); | |
79ad62b2 | 1195 | } |
8d08fdba | 1196 | \f |
607cf131 MM |
1197 | /* Run through the base clases of T, updating |
1198 | CANT_HAVE_DEFAULT_CTOR_P, CANT_HAVE_CONST_CTOR_P, and | |
1199 | NO_CONST_ASN_REF_P. Also set flag bits in T based on properties of | |
1200 | the bases. */ | |
8d08fdba | 1201 | |
607cf131 | 1202 | static void |
94edc4ab NN |
1203 | check_bases (tree t, |
1204 | int* cant_have_default_ctor_p, | |
1205 | int* cant_have_const_ctor_p, | |
1206 | int* no_const_asn_ref_p) | |
8d08fdba | 1207 | { |
607cf131 MM |
1208 | int n_baseclasses; |
1209 | int i; | |
0fb3018c | 1210 | int seen_non_virtual_nearly_empty_base_p; |
607cf131 | 1211 | tree binfos; |
8d08fdba | 1212 | |
607cf131 MM |
1213 | binfos = TYPE_BINFO_BASETYPES (t); |
1214 | n_baseclasses = CLASSTYPE_N_BASECLASSES (t); | |
0fb3018c | 1215 | seen_non_virtual_nearly_empty_base_p = 0; |
607cf131 MM |
1216 | |
1217 | /* An aggregate cannot have baseclasses. */ | |
1218 | CLASSTYPE_NON_AGGREGATE (t) |= (n_baseclasses != 0); | |
1219 | ||
1220 | for (i = 0; i < n_baseclasses; ++i) | |
8d08fdba | 1221 | { |
607cf131 MM |
1222 | tree base_binfo; |
1223 | tree basetype; | |
8d08fdba | 1224 | |
607cf131 MM |
1225 | /* Figure out what base we're looking at. */ |
1226 | base_binfo = TREE_VEC_ELT (binfos, i); | |
1227 | basetype = TREE_TYPE (base_binfo); | |
9a71c18b | 1228 | |
607cf131 MM |
1229 | /* If the type of basetype is incomplete, then we already |
1230 | complained about that fact (and we should have fixed it up as | |
1231 | well). */ | |
d0f062fb | 1232 | if (!COMPLETE_TYPE_P (basetype)) |
8d08fdba MS |
1233 | { |
1234 | int j; | |
1235 | /* The base type is of incomplete type. It is | |
1236 | probably best to pretend that it does not | |
1237 | exist. */ | |
1238 | if (i == n_baseclasses-1) | |
1239 | TREE_VEC_ELT (binfos, i) = NULL_TREE; | |
1240 | TREE_VEC_LENGTH (binfos) -= 1; | |
1241 | n_baseclasses -= 1; | |
1242 | for (j = i; j+1 < n_baseclasses; j++) | |
1243 | TREE_VEC_ELT (binfos, j) = TREE_VEC_ELT (binfos, j+1); | |
607cf131 | 1244 | continue; |
8d08fdba MS |
1245 | } |
1246 | ||
4c6b7393 | 1247 | /* Effective C++ rule 14. We only need to check TYPE_POLYMORPHIC_P |
607cf131 MM |
1248 | here because the case of virtual functions but non-virtual |
1249 | dtor is handled in finish_struct_1. */ | |
4c6b7393 | 1250 | if (warn_ecpp && ! TYPE_POLYMORPHIC_P (basetype) |
607cf131 | 1251 | && TYPE_HAS_DESTRUCTOR (basetype)) |
33bd39a2 | 1252 | warning ("base class `%#T' has a non-virtual destructor", |
607cf131 | 1253 | basetype); |
8d08fdba | 1254 | |
607cf131 MM |
1255 | /* If the base class doesn't have copy constructors or |
1256 | assignment operators that take const references, then the | |
1257 | derived class cannot have such a member automatically | |
1258 | generated. */ | |
1259 | if (! TYPE_HAS_CONST_INIT_REF (basetype)) | |
1260 | *cant_have_const_ctor_p = 1; | |
1261 | if (TYPE_HAS_ASSIGN_REF (basetype) | |
1262 | && !TYPE_HAS_CONST_ASSIGN_REF (basetype)) | |
1263 | *no_const_asn_ref_p = 1; | |
1264 | /* Similarly, if the base class doesn't have a default | |
1265 | constructor, then the derived class won't have an | |
1266 | automatically generated default constructor. */ | |
8d08fdba MS |
1267 | if (TYPE_HAS_CONSTRUCTOR (basetype) |
1268 | && ! TYPE_HAS_DEFAULT_CONSTRUCTOR (basetype)) | |
1269 | { | |
607cf131 | 1270 | *cant_have_default_ctor_p = 1; |
8d08fdba | 1271 | if (! TYPE_HAS_CONSTRUCTOR (t)) |
33bd39a2 | 1272 | pedwarn ("base `%T' with only non-default constructor in class without a constructor", |
cb9a3ff8 | 1273 | basetype); |
8d08fdba MS |
1274 | } |
1275 | ||
0fb3018c | 1276 | if (TREE_VIA_VIRTUAL (base_binfo)) |
00a17e31 | 1277 | /* A virtual base does not effect nearly emptiness. */ |
0fb3018c | 1278 | ; |
f9c528ea | 1279 | else if (CLASSTYPE_NEARLY_EMPTY_P (basetype)) |
0fb3018c NS |
1280 | { |
1281 | if (seen_non_virtual_nearly_empty_base_p) | |
1282 | /* And if there is more than one nearly empty base, then the | |
1283 | derived class is not nearly empty either. */ | |
1284 | CLASSTYPE_NEARLY_EMPTY_P (t) = 0; | |
1285 | else | |
00a17e31 | 1286 | /* Remember we've seen one. */ |
0fb3018c NS |
1287 | seen_non_virtual_nearly_empty_base_p = 1; |
1288 | } | |
1289 | else if (!is_empty_class (basetype)) | |
1290 | /* If the base class is not empty or nearly empty, then this | |
1291 | class cannot be nearly empty. */ | |
1292 | CLASSTYPE_NEARLY_EMPTY_P (t) = 0; | |
f9c528ea | 1293 | |
607cf131 MM |
1294 | /* A lot of properties from the bases also apply to the derived |
1295 | class. */ | |
8d08fdba | 1296 | TYPE_NEEDS_CONSTRUCTING (t) |= TYPE_NEEDS_CONSTRUCTING (basetype); |
834c6dff MM |
1297 | TYPE_HAS_NONTRIVIAL_DESTRUCTOR (t) |
1298 | |= TYPE_HAS_NONTRIVIAL_DESTRUCTOR (basetype); | |
607cf131 MM |
1299 | TYPE_HAS_COMPLEX_ASSIGN_REF (t) |
1300 | |= TYPE_HAS_COMPLEX_ASSIGN_REF (basetype); | |
e8abc66f | 1301 | TYPE_HAS_COMPLEX_INIT_REF (t) |= TYPE_HAS_COMPLEX_INIT_REF (basetype); |
4c6b7393 | 1302 | TYPE_POLYMORPHIC_P (t) |= TYPE_POLYMORPHIC_P (basetype); |
5ec1192e MM |
1303 | CLASSTYPE_CONTAINS_EMPTY_CLASS_P (t) |
1304 | |= CLASSTYPE_CONTAINS_EMPTY_CLASS_P (basetype); | |
607cf131 MM |
1305 | } |
1306 | } | |
1307 | ||
9965d119 NS |
1308 | /* Set BINFO_PRIMARY_BASE_OF for all binfos in the hierarchy |
1309 | dominated by TYPE that are primary bases. */ | |
c35cce41 MM |
1310 | |
1311 | static void | |
94edc4ab | 1312 | mark_primary_bases (tree type) |
c35cce41 | 1313 | { |
9965d119 NS |
1314 | tree binfo; |
1315 | ||
1316 | /* Walk the bases in inheritance graph order. */ | |
1317 | for (binfo = TYPE_BINFO (type); binfo; binfo = TREE_CHAIN (binfo)) | |
c35cce41 | 1318 | { |
dbbf88d1 | 1319 | tree base_binfo = get_primary_binfo (binfo); |
c35cce41 | 1320 | |
dbbf88d1 NS |
1321 | if (!base_binfo) |
1322 | /* Not a dynamic base. */; | |
1323 | else if (BINFO_PRIMARY_P (base_binfo)) | |
39e78d8b | 1324 | BINFO_LOST_PRIMARY_P (binfo) = 1; |
dbbf88d1 NS |
1325 | else |
1326 | { | |
1327 | BINFO_PRIMARY_BASE_OF (base_binfo) = binfo; | |
1328 | /* A virtual binfo might have been copied from within | |
1329 | another hierarchy. As we're about to use it as a primary | |
1330 | base, make sure the offsets match. */ | |
1331 | if (TREE_VIA_VIRTUAL (base_binfo)) | |
1332 | { | |
1333 | tree delta = size_diffop (convert (ssizetype, | |
1334 | BINFO_OFFSET (binfo)), | |
1335 | convert (ssizetype, | |
1336 | BINFO_OFFSET (base_binfo))); | |
1337 | ||
1338 | propagate_binfo_offsets (base_binfo, delta); | |
1339 | } | |
1340 | } | |
c35cce41 MM |
1341 | } |
1342 | } | |
1343 | ||
911a71a7 | 1344 | /* Make the BINFO the primary base of T. */ |
607cf131 | 1345 | |
03702748 | 1346 | static void |
94edc4ab | 1347 | set_primary_base (tree t, tree binfo) |
03702748 MM |
1348 | { |
1349 | tree basetype; | |
1350 | ||
911a71a7 MM |
1351 | CLASSTYPE_PRIMARY_BINFO (t) = binfo; |
1352 | basetype = BINFO_TYPE (binfo); | |
03702748 MM |
1353 | TYPE_BINFO_VTABLE (t) = TYPE_BINFO_VTABLE (basetype); |
1354 | TYPE_BINFO_VIRTUALS (t) = TYPE_BINFO_VIRTUALS (basetype); | |
1355 | TYPE_VFIELD (t) = TYPE_VFIELD (basetype); | |
03702748 | 1356 | } |
607cf131 | 1357 | |
03702748 | 1358 | /* Determine the primary class for T. */ |
607cf131 | 1359 | |
03702748 | 1360 | static void |
94edc4ab | 1361 | determine_primary_base (tree t) |
607cf131 | 1362 | { |
607cf131 | 1363 | int i, n_baseclasses = CLASSTYPE_N_BASECLASSES (t); |
911a71a7 MM |
1364 | tree vbases; |
1365 | tree type_binfo; | |
d2c5305b | 1366 | |
8026246f MM |
1367 | /* If there are no baseclasses, there is certainly no primary base. */ |
1368 | if (n_baseclasses == 0) | |
1369 | return; | |
1370 | ||
911a71a7 | 1371 | type_binfo = TYPE_BINFO (t); |
607cf131 MM |
1372 | |
1373 | for (i = 0; i < n_baseclasses; i++) | |
1374 | { | |
911a71a7 | 1375 | tree base_binfo = BINFO_BASETYPE (type_binfo, i); |
607cf131 | 1376 | tree basetype = BINFO_TYPE (base_binfo); |
aff08c18 | 1377 | |
bbd15aac | 1378 | if (TYPE_CONTAINS_VPTR_P (basetype)) |
8d08fdba | 1379 | { |
3461fba7 NS |
1380 | /* We prefer a non-virtual base, although a virtual one will |
1381 | do. */ | |
8d08fdba MS |
1382 | if (TREE_VIA_VIRTUAL (base_binfo)) |
1383 | continue; | |
1384 | ||
03702748 | 1385 | if (!CLASSTYPE_HAS_PRIMARY_BASE_P (t)) |
8d08fdba | 1386 | { |
e93ee644 | 1387 | set_primary_base (t, base_binfo); |
03702748 | 1388 | CLASSTYPE_VFIELDS (t) = copy_list (CLASSTYPE_VFIELDS (basetype)); |
8d08fdba MS |
1389 | } |
1390 | else | |
1391 | { | |
03702748 MM |
1392 | tree vfields; |
1393 | ||
8d08fdba | 1394 | /* Only add unique vfields, and flatten them out as we go. */ |
03702748 MM |
1395 | for (vfields = CLASSTYPE_VFIELDS (basetype); |
1396 | vfields; | |
1397 | vfields = TREE_CHAIN (vfields)) | |
1398 | if (VF_BINFO_VALUE (vfields) == NULL_TREE | |
1399 | || ! TREE_VIA_VIRTUAL (VF_BINFO_VALUE (vfields))) | |
1400 | CLASSTYPE_VFIELDS (t) | |
1401 | = tree_cons (base_binfo, | |
1402 | VF_BASETYPE_VALUE (vfields), | |
1403 | CLASSTYPE_VFIELDS (t)); | |
8d08fdba MS |
1404 | } |
1405 | } | |
1406 | } | |
1407 | ||
03702748 | 1408 | if (!TYPE_VFIELD (t)) |
911a71a7 MM |
1409 | CLASSTYPE_PRIMARY_BINFO (t) = NULL_TREE; |
1410 | ||
9965d119 NS |
1411 | /* Find the indirect primary bases - those virtual bases which are primary |
1412 | bases of something else in this hierarchy. */ | |
911a71a7 MM |
1413 | for (vbases = CLASSTYPE_VBASECLASSES (t); |
1414 | vbases; | |
1415 | vbases = TREE_CHAIN (vbases)) | |
1416 | { | |
9965d119 | 1417 | tree vbase_binfo = TREE_VALUE (vbases); |
911a71a7 | 1418 | |
9965d119 NS |
1419 | /* See if this virtual base is an indirect primary base. To be so, |
1420 | it must be a primary base within the hierarchy of one of our | |
1421 | direct bases. */ | |
911a71a7 MM |
1422 | for (i = 0; i < n_baseclasses; ++i) |
1423 | { | |
9965d119 | 1424 | tree basetype = TYPE_BINFO_BASETYPE (t, i); |
911a71a7 MM |
1425 | tree v; |
1426 | ||
911a71a7 MM |
1427 | for (v = CLASSTYPE_VBASECLASSES (basetype); |
1428 | v; | |
1429 | v = TREE_CHAIN (v)) | |
1430 | { | |
9965d119 NS |
1431 | tree base_vbase = TREE_VALUE (v); |
1432 | ||
1433 | if (BINFO_PRIMARY_P (base_vbase) | |
1434 | && same_type_p (BINFO_TYPE (base_vbase), | |
1435 | BINFO_TYPE (vbase_binfo))) | |
911a71a7 | 1436 | { |
9965d119 | 1437 | BINFO_INDIRECT_PRIMARY_P (vbase_binfo) = 1; |
911a71a7 MM |
1438 | break; |
1439 | } | |
1440 | } | |
1441 | ||
1442 | /* If we've discovered that this virtual base is an indirect | |
1443 | primary base, then we can move on to the next virtual | |
1444 | base. */ | |
9965d119 | 1445 | if (BINFO_INDIRECT_PRIMARY_P (vbase_binfo)) |
911a71a7 MM |
1446 | break; |
1447 | } | |
1448 | } | |
8026246f | 1449 | |
3461fba7 NS |
1450 | /* A "nearly-empty" virtual base class can be the primary base |
1451 | class, if no non-virtual polymorphic base can be found. */ | |
1f84ec23 | 1452 | if (!CLASSTYPE_HAS_PRIMARY_BASE_P (t)) |
7cafdb8b | 1453 | { |
911a71a7 MM |
1454 | /* If not NULL, this is the best primary base candidate we have |
1455 | found so far. */ | |
1456 | tree candidate = NULL_TREE; | |
1457 | tree base_binfo; | |
7cafdb8b MM |
1458 | |
1459 | /* Loop over the baseclasses. */ | |
911a71a7 MM |
1460 | for (base_binfo = TYPE_BINFO (t); |
1461 | base_binfo; | |
1462 | base_binfo = TREE_CHAIN (base_binfo)) | |
7cafdb8b | 1463 | { |
7cafdb8b MM |
1464 | tree basetype = BINFO_TYPE (base_binfo); |
1465 | ||
1466 | if (TREE_VIA_VIRTUAL (base_binfo) | |
1467 | && CLASSTYPE_NEARLY_EMPTY_P (basetype)) | |
1468 | { | |
7cafdb8b MM |
1469 | /* If this is not an indirect primary base, then it's |
1470 | definitely our primary base. */ | |
911a71a7 | 1471 | if (!BINFO_INDIRECT_PRIMARY_P (base_binfo)) |
7cafdb8b | 1472 | { |
911a71a7 | 1473 | candidate = base_binfo; |
7cafdb8b MM |
1474 | break; |
1475 | } | |
9965d119 NS |
1476 | |
1477 | /* If this is an indirect primary base, it still could be | |
1478 | our primary base -- unless we later find there's another | |
1479 | nearly-empty virtual base that isn't an indirect | |
1480 | primary base. */ | |
1481 | if (!candidate) | |
911a71a7 | 1482 | candidate = base_binfo; |
7cafdb8b MM |
1483 | } |
1484 | } | |
1485 | ||
1486 | /* If we've got a primary base, use it. */ | |
911a71a7 | 1487 | if (candidate) |
7cafdb8b | 1488 | { |
e93ee644 | 1489 | set_primary_base (t, candidate); |
7cafdb8b | 1490 | CLASSTYPE_VFIELDS (t) |
911a71a7 | 1491 | = copy_list (CLASSTYPE_VFIELDS (BINFO_TYPE (candidate))); |
7cafdb8b MM |
1492 | } |
1493 | } | |
dd42e135 MM |
1494 | |
1495 | /* Mark the primary base classes at this point. */ | |
8026246f | 1496 | mark_primary_bases (t); |
8d08fdba | 1497 | } |
8d08fdba | 1498 | \f |
d2c5305b MM |
1499 | /* Set memoizing fields and bits of T (and its variants) for later |
1500 | use. */ | |
e92cc029 | 1501 | |
8d08fdba | 1502 | static void |
94edc4ab | 1503 | finish_struct_bits (tree t) |
8d08fdba MS |
1504 | { |
1505 | int i, n_baseclasses = CLASSTYPE_N_BASECLASSES (t); | |
8d08fdba MS |
1506 | |
1507 | /* Fix up variants (if any). */ | |
1508 | tree variants = TYPE_NEXT_VARIANT (t); | |
1509 | while (variants) | |
1510 | { | |
1511 | /* These fields are in the _TYPE part of the node, not in | |
1512 | the TYPE_LANG_SPECIFIC component, so they are not shared. */ | |
1513 | TYPE_HAS_CONSTRUCTOR (variants) = TYPE_HAS_CONSTRUCTOR (t); | |
1514 | TYPE_HAS_DESTRUCTOR (variants) = TYPE_HAS_DESTRUCTOR (t); | |
1515 | TYPE_NEEDS_CONSTRUCTING (variants) = TYPE_NEEDS_CONSTRUCTING (t); | |
834c6dff MM |
1516 | TYPE_HAS_NONTRIVIAL_DESTRUCTOR (variants) |
1517 | = TYPE_HAS_NONTRIVIAL_DESTRUCTOR (t); | |
8d08fdba | 1518 | |
4c6b7393 MM |
1519 | TYPE_BASE_CONVS_MAY_REQUIRE_CODE_P (variants) |
1520 | = TYPE_BASE_CONVS_MAY_REQUIRE_CODE_P (t); | |
1521 | TYPE_POLYMORPHIC_P (variants) = TYPE_POLYMORPHIC_P (t); | |
8d08fdba MS |
1522 | TYPE_USES_VIRTUAL_BASECLASSES (variants) = TYPE_USES_VIRTUAL_BASECLASSES (t); |
1523 | /* Copy whatever these are holding today. */ | |
1524 | TYPE_MIN_VALUE (variants) = TYPE_MIN_VALUE (t); | |
1525 | TYPE_MAX_VALUE (variants) = TYPE_MAX_VALUE (t); | |
5566b478 | 1526 | TYPE_FIELDS (variants) = TYPE_FIELDS (t); |
e92cc029 | 1527 | TYPE_SIZE (variants) = TYPE_SIZE (t); |
509087ae | 1528 | TYPE_SIZE_UNIT (variants) = TYPE_SIZE_UNIT (t); |
8d08fdba MS |
1529 | variants = TYPE_NEXT_VARIANT (variants); |
1530 | } | |
1531 | ||
d2c5305b | 1532 | if (n_baseclasses && TYPE_POLYMORPHIC_P (t)) |
fee7654e MM |
1533 | /* For a class w/o baseclasses, `finish_struct' has set |
1534 | CLASS_TYPE_ABSTRACT_VIRTUALS correctly (by | |
1535 | definition). Similarly for a class whose base classes do not | |
1536 | have vtables. When neither of these is true, we might have | |
1537 | removed abstract virtuals (by providing a definition), added | |
1538 | some (by declaring new ones), or redeclared ones from a base | |
1539 | class. We need to recalculate what's really an abstract virtual | |
1540 | at this point (by looking in the vtables). */ | |
1541 | get_pure_virtuals (t); | |
8d08fdba MS |
1542 | |
1543 | if (n_baseclasses) | |
1544 | { | |
1545 | /* Notice whether this class has type conversion functions defined. */ | |
1546 | tree binfo = TYPE_BINFO (t); | |
1547 | tree binfos = BINFO_BASETYPES (binfo); | |
1548 | tree basetype; | |
1549 | ||
1550 | for (i = n_baseclasses-1; i >= 0; i--) | |
1551 | { | |
1552 | basetype = BINFO_TYPE (TREE_VEC_ELT (binfos, i)); | |
1553 | ||
0b41abe6 | 1554 | TYPE_HAS_CONVERSION (t) |= TYPE_HAS_CONVERSION (basetype); |
8d08fdba MS |
1555 | } |
1556 | } | |
1557 | ||
ffd696af JM |
1558 | /* If this type has a copy constructor or a destructor, force its mode to |
1559 | be BLKmode, and force its TREE_ADDRESSABLE bit to be nonzero. This | |
1560 | will cause it to be passed by invisible reference and prevent it from | |
8b16faa2 MM |
1561 | being returned in a register. */ |
1562 | if (! TYPE_HAS_TRIVIAL_INIT_REF (t) || TYPE_HAS_NONTRIVIAL_DESTRUCTOR (t)) | |
8d08fdba | 1563 | { |
e8abc66f | 1564 | tree variants; |
d2e5ee5c | 1565 | DECL_MODE (TYPE_MAIN_DECL (t)) = BLKmode; |
e8abc66f | 1566 | for (variants = t; variants; variants = TYPE_NEXT_VARIANT (variants)) |
8d08fdba MS |
1567 | { |
1568 | TYPE_MODE (variants) = BLKmode; | |
1569 | TREE_ADDRESSABLE (variants) = 1; | |
8d08fdba MS |
1570 | } |
1571 | } | |
1572 | } | |
1573 | ||
b0e0b31f MM |
1574 | /* Issue warnings about T having private constructors, but no friends, |
1575 | and so forth. | |
aed7b2a6 | 1576 | |
b0e0b31f MM |
1577 | HAS_NONPRIVATE_METHOD is nonzero if T has any non-private methods or |
1578 | static members. HAS_NONPRIVATE_STATIC_FN is nonzero if T has any | |
1579 | non-private static member functions. */ | |
1580 | ||
1581 | static void | |
94edc4ab | 1582 | maybe_warn_about_overly_private_class (tree t) |
aed7b2a6 | 1583 | { |
056a3b12 MM |
1584 | int has_member_fn = 0; |
1585 | int has_nonprivate_method = 0; | |
1586 | tree fn; | |
1587 | ||
1588 | if (!warn_ctor_dtor_privacy | |
b0e0b31f MM |
1589 | /* If the class has friends, those entities might create and |
1590 | access instances, so we should not warn. */ | |
056a3b12 MM |
1591 | || (CLASSTYPE_FRIEND_CLASSES (t) |
1592 | || DECL_FRIENDLIST (TYPE_MAIN_DECL (t))) | |
b0e0b31f MM |
1593 | /* We will have warned when the template was declared; there's |
1594 | no need to warn on every instantiation. */ | |
056a3b12 MM |
1595 | || CLASSTYPE_TEMPLATE_INSTANTIATION (t)) |
1596 | /* There's no reason to even consider warning about this | |
1597 | class. */ | |
1598 | return; | |
1599 | ||
1600 | /* We only issue one warning, if more than one applies, because | |
1601 | otherwise, on code like: | |
1602 | ||
1603 | class A { | |
1604 | // Oops - forgot `public:' | |
1605 | A(); | |
1606 | A(const A&); | |
1607 | ~A(); | |
1608 | }; | |
1609 | ||
1610 | we warn several times about essentially the same problem. */ | |
1611 | ||
1612 | /* Check to see if all (non-constructor, non-destructor) member | |
1613 | functions are private. (Since there are no friends or | |
1614 | non-private statics, we can't ever call any of the private member | |
1615 | functions.) */ | |
1616 | for (fn = TYPE_METHODS (t); fn; fn = TREE_CHAIN (fn)) | |
1617 | /* We're not interested in compiler-generated methods; they don't | |
1618 | provide any way to call private members. */ | |
1619 | if (!DECL_ARTIFICIAL (fn)) | |
1620 | { | |
1621 | if (!TREE_PRIVATE (fn)) | |
b0e0b31f | 1622 | { |
056a3b12 MM |
1623 | if (DECL_STATIC_FUNCTION_P (fn)) |
1624 | /* A non-private static member function is just like a | |
1625 | friend; it can create and invoke private member | |
1626 | functions, and be accessed without a class | |
1627 | instance. */ | |
1628 | return; | |
b0e0b31f | 1629 | |
056a3b12 | 1630 | has_nonprivate_method = 1; |
f576dfc4 | 1631 | /* Keep searching for a static member function. */ |
056a3b12 | 1632 | } |
ce0a5952 | 1633 | else if (!DECL_CONSTRUCTOR_P (fn) && !DECL_DESTRUCTOR_P (fn)) |
056a3b12 MM |
1634 | has_member_fn = 1; |
1635 | } | |
aed7b2a6 | 1636 | |
056a3b12 MM |
1637 | if (!has_nonprivate_method && has_member_fn) |
1638 | { | |
ce0a5952 MM |
1639 | /* There are no non-private methods, and there's at least one |
1640 | private member function that isn't a constructor or | |
1641 | destructor. (If all the private members are | |
1642 | constructors/destructors we want to use the code below that | |
1643 | issues error messages specifically referring to | |
1644 | constructors/destructors.) */ | |
056a3b12 | 1645 | int i; |
dbbf88d1 NS |
1646 | tree binfo = TYPE_BINFO (t); |
1647 | ||
1648 | for (i = 0; i < BINFO_N_BASETYPES (binfo); i++) | |
1649 | if (BINFO_BASEACCESS (binfo, i) != access_private_node) | |
056a3b12 MM |
1650 | { |
1651 | has_nonprivate_method = 1; | |
1652 | break; | |
1653 | } | |
1654 | if (!has_nonprivate_method) | |
b0e0b31f | 1655 | { |
33bd39a2 | 1656 | warning ("all member functions in class `%T' are private", t); |
056a3b12 | 1657 | return; |
b0e0b31f | 1658 | } |
056a3b12 | 1659 | } |
aed7b2a6 | 1660 | |
056a3b12 MM |
1661 | /* Even if some of the member functions are non-private, the class |
1662 | won't be useful for much if all the constructors or destructors | |
1663 | are private: such an object can never be created or destroyed. */ | |
4b0d3cbe MM |
1664 | if (TYPE_HAS_DESTRUCTOR (t) |
1665 | && TREE_PRIVATE (CLASSTYPE_DESTRUCTORS (t))) | |
056a3b12 | 1666 | { |
4b0d3cbe MM |
1667 | warning ("`%#T' only defines a private destructor and has no friends", |
1668 | t); | |
1669 | return; | |
056a3b12 | 1670 | } |
b0e0b31f | 1671 | |
056a3b12 MM |
1672 | if (TYPE_HAS_CONSTRUCTOR (t)) |
1673 | { | |
1674 | int nonprivate_ctor = 0; | |
b0e0b31f | 1675 | |
056a3b12 MM |
1676 | /* If a non-template class does not define a copy |
1677 | constructor, one is defined for it, enabling it to avoid | |
1678 | this warning. For a template class, this does not | |
1679 | happen, and so we would normally get a warning on: | |
b0e0b31f | 1680 | |
056a3b12 | 1681 | template <class T> class C { private: C(); }; |
b0e0b31f | 1682 | |
056a3b12 MM |
1683 | To avoid this asymmetry, we check TYPE_HAS_INIT_REF. All |
1684 | complete non-template or fully instantiated classes have this | |
1685 | flag set. */ | |
1686 | if (!TYPE_HAS_INIT_REF (t)) | |
1687 | nonprivate_ctor = 1; | |
1688 | else | |
1689 | for (fn = TREE_VEC_ELT (CLASSTYPE_METHOD_VEC (t), 0); | |
1690 | fn; | |
1691 | fn = OVL_NEXT (fn)) | |
1692 | { | |
1693 | tree ctor = OVL_CURRENT (fn); | |
1694 | /* Ideally, we wouldn't count copy constructors (or, in | |
1695 | fact, any constructor that takes an argument of the | |
1696 | class type as a parameter) because such things cannot | |
1697 | be used to construct an instance of the class unless | |
1698 | you already have one. But, for now at least, we're | |
1699 | more generous. */ | |
1700 | if (! TREE_PRIVATE (ctor)) | |
b0e0b31f | 1701 | { |
056a3b12 MM |
1702 | nonprivate_ctor = 1; |
1703 | break; | |
b0e0b31f | 1704 | } |
056a3b12 | 1705 | } |
aed7b2a6 | 1706 | |
056a3b12 MM |
1707 | if (nonprivate_ctor == 0) |
1708 | { | |
33bd39a2 | 1709 | warning ("`%#T' only defines private constructors and has no friends", |
056a3b12 MM |
1710 | t); |
1711 | return; | |
b0e0b31f MM |
1712 | } |
1713 | } | |
aed7b2a6 MM |
1714 | } |
1715 | ||
17211ab5 GK |
1716 | static struct { |
1717 | gt_pointer_operator new_value; | |
1718 | void *cookie; | |
1719 | } resort_data; | |
1720 | ||
f90cdf34 MT |
1721 | /* Comparison function to compare two TYPE_METHOD_VEC entries by name. */ |
1722 | ||
1723 | static int | |
94edc4ab | 1724 | method_name_cmp (const void* m1_p, const void* m2_p) |
f90cdf34 | 1725 | { |
17211ab5 GK |
1726 | const tree *const m1 = m1_p; |
1727 | const tree *const m2 = m2_p; | |
1728 | ||
f90cdf34 MT |
1729 | if (*m1 == NULL_TREE && *m2 == NULL_TREE) |
1730 | return 0; | |
1731 | if (*m1 == NULL_TREE) | |
1732 | return -1; | |
1733 | if (*m2 == NULL_TREE) | |
1734 | return 1; | |
1735 | if (DECL_NAME (OVL_CURRENT (*m1)) < DECL_NAME (OVL_CURRENT (*m2))) | |
1736 | return -1; | |
1737 | return 1; | |
1738 | } | |
b0e0b31f | 1739 | |
17211ab5 GK |
1740 | /* This routine compares two fields like method_name_cmp but using the |
1741 | pointer operator in resort_field_decl_data. */ | |
1742 | ||
1743 | static int | |
94edc4ab | 1744 | resort_method_name_cmp (const void* m1_p, const void* m2_p) |
17211ab5 GK |
1745 | { |
1746 | const tree *const m1 = m1_p; | |
1747 | const tree *const m2 = m2_p; | |
1748 | if (*m1 == NULL_TREE && *m2 == NULL_TREE) | |
1749 | return 0; | |
1750 | if (*m1 == NULL_TREE) | |
1751 | return -1; | |
1752 | if (*m2 == NULL_TREE) | |
1753 | return 1; | |
1754 | { | |
1755 | tree d1 = DECL_NAME (OVL_CURRENT (*m1)); | |
1756 | tree d2 = DECL_NAME (OVL_CURRENT (*m2)); | |
1757 | resort_data.new_value (&d1, resort_data.cookie); | |
1758 | resort_data.new_value (&d2, resort_data.cookie); | |
1759 | if (d1 < d2) | |
1760 | return -1; | |
1761 | } | |
1762 | return 1; | |
1763 | } | |
1764 | ||
1765 | /* Resort TYPE_METHOD_VEC because pointers have been reordered. */ | |
1766 | ||
1767 | void | |
94edc4ab NN |
1768 | resort_type_method_vec (void* obj, |
1769 | void* orig_obj ATTRIBUTE_UNUSED , | |
1770 | gt_pointer_operator new_value, | |
1771 | void* cookie) | |
17211ab5 GK |
1772 | { |
1773 | tree method_vec = obj; | |
1774 | int len = TREE_VEC_LENGTH (method_vec); | |
1775 | int slot; | |
1776 | ||
1777 | /* The type conversion ops have to live at the front of the vec, so we | |
1778 | can't sort them. */ | |
1779 | for (slot = 2; slot < len; ++slot) | |
1780 | { | |
1781 | tree fn = TREE_VEC_ELT (method_vec, slot); | |
1782 | ||
1783 | if (!DECL_CONV_FN_P (OVL_CURRENT (fn))) | |
1784 | break; | |
1785 | } | |
1786 | if (len - slot > 1) | |
1787 | { | |
1788 | resort_data.new_value = new_value; | |
1789 | resort_data.cookie = cookie; | |
1790 | qsort (&TREE_VEC_ELT (method_vec, slot), len - slot, sizeof (tree), | |
1791 | resort_method_name_cmp); | |
1792 | } | |
1793 | } | |
1794 | ||
8d08fdba MS |
1795 | /* Warn about duplicate methods in fn_fields. Also compact method |
1796 | lists so that lookup can be made faster. | |
1797 | ||
8d08fdba MS |
1798 | Data Structure: List of method lists. The outer list is a |
1799 | TREE_LIST, whose TREE_PURPOSE field is the field name and the | |
e1cd6e56 MS |
1800 | TREE_VALUE is the DECL_CHAIN of the FUNCTION_DECLs. TREE_CHAIN |
1801 | links the entire list of methods for TYPE_METHODS. Friends are | |
1802 | chained in the same way as member functions (? TREE_CHAIN or | |
1803 | DECL_CHAIN), but they live in the TREE_TYPE field of the outer | |
1804 | list. That allows them to be quickly deleted, and requires no | |
1805 | extra storage. | |
8d08fdba | 1806 | |
5b0cec3b MM |
1807 | Sort methods that are not special (i.e., constructors, destructors, |
1808 | and type conversion operators) so that we can find them faster in | |
1809 | search. */ | |
8d08fdba | 1810 | |
b0e0b31f | 1811 | static void |
94edc4ab | 1812 | finish_struct_methods (tree t) |
8d08fdba | 1813 | { |
b0e0b31f | 1814 | tree fn_fields; |
58010b57 | 1815 | tree method_vec; |
58010b57 MM |
1816 | int slot, len; |
1817 | ||
1818 | if (!TYPE_METHODS (t)) | |
1819 | { | |
1820 | /* Clear these for safety; perhaps some parsing error could set | |
1821 | these incorrectly. */ | |
1822 | TYPE_HAS_CONSTRUCTOR (t) = 0; | |
1823 | TYPE_HAS_DESTRUCTOR (t) = 0; | |
1824 | CLASSTYPE_METHOD_VEC (t) = NULL_TREE; | |
1825 | return; | |
1826 | } | |
1827 | ||
58010b57 | 1828 | method_vec = CLASSTYPE_METHOD_VEC (t); |
607cf131 | 1829 | my_friendly_assert (method_vec != NULL_TREE, 19991215); |
58010b57 | 1830 | len = TREE_VEC_LENGTH (method_vec); |
8d08fdba | 1831 | |
fc378698 MS |
1832 | /* First fill in entry 0 with the constructors, entry 1 with destructors, |
1833 | and the next few with type conversion operators (if any). */ | |
b0e0b31f MM |
1834 | for (fn_fields = TYPE_METHODS (t); fn_fields; |
1835 | fn_fields = TREE_CHAIN (fn_fields)) | |
5b0cec3b MM |
1836 | /* Clear out this flag. */ |
1837 | DECL_IN_AGGR_P (fn_fields) = 0; | |
8d08fdba | 1838 | |
0d9eb3ba | 1839 | if (TYPE_HAS_DESTRUCTOR (t) && !CLASSTYPE_DESTRUCTORS (t)) |
b0e0b31f MM |
1840 | /* We thought there was a destructor, but there wasn't. Some |
1841 | parse errors cause this anomalous situation. */ | |
1842 | TYPE_HAS_DESTRUCTOR (t) = 0; | |
1843 | ||
1844 | /* Issue warnings about private constructors and such. If there are | |
1845 | no methods, then some public defaults are generated. */ | |
f90cdf34 MT |
1846 | maybe_warn_about_overly_private_class (t); |
1847 | ||
f90cdf34 MT |
1848 | /* Now sort the methods. */ |
1849 | while (len > 2 && TREE_VEC_ELT (method_vec, len-1) == NULL_TREE) | |
1850 | len--; | |
1851 | TREE_VEC_LENGTH (method_vec) = len; | |
1852 | ||
1853 | /* The type conversion ops have to live at the front of the vec, so we | |
1854 | can't sort them. */ | |
1855 | for (slot = 2; slot < len; ++slot) | |
1856 | { | |
1857 | tree fn = TREE_VEC_ELT (method_vec, slot); | |
1858 | ||
1859 | if (!DECL_CONV_FN_P (OVL_CURRENT (fn))) | |
1860 | break; | |
1861 | } | |
1862 | if (len - slot > 1) | |
1863 | qsort (&TREE_VEC_ELT (method_vec, slot), len-slot, sizeof (tree), | |
17211ab5 | 1864 | method_name_cmp); |
8d08fdba MS |
1865 | } |
1866 | ||
90ecce3e | 1867 | /* Make BINFO's vtable have N entries, including RTTI entries, |
8d7a5379 MM |
1868 | vbase and vcall offsets, etc. Set its type and call the backend |
1869 | to lay it out. */ | |
1a588ad7 MM |
1870 | |
1871 | static void | |
94edc4ab | 1872 | layout_vtable_decl (tree binfo, int n) |
1a588ad7 | 1873 | { |
1a588ad7 | 1874 | tree atype; |
c35cce41 | 1875 | tree vtable; |
1a588ad7 | 1876 | |
1a588ad7 | 1877 | atype = build_cplus_array_type (vtable_entry_type, |
442e01b6 | 1878 | build_index_type (size_int (n - 1))); |
1a588ad7 MM |
1879 | layout_type (atype); |
1880 | ||
1881 | /* We may have to grow the vtable. */ | |
c35cce41 MM |
1882 | vtable = get_vtbl_decl_for_binfo (binfo); |
1883 | if (!same_type_p (TREE_TYPE (vtable), atype)) | |
1a588ad7 | 1884 | { |
06ceef4e | 1885 | TREE_TYPE (vtable) = atype; |
c35cce41 | 1886 | DECL_SIZE (vtable) = DECL_SIZE_UNIT (vtable) = NULL_TREE; |
06ceef4e | 1887 | layout_decl (vtable, 0); |
1a588ad7 MM |
1888 | } |
1889 | } | |
1890 | ||
9bab6c90 MM |
1891 | /* True iff FNDECL and BASE_FNDECL (both non-static member functions) |
1892 | have the same signature. */ | |
83f2ccf4 | 1893 | |
e0fff4b3 | 1894 | int |
94edc4ab | 1895 | same_signature_p (tree fndecl, tree base_fndecl) |
83f2ccf4 | 1896 | { |
872f37f9 MM |
1897 | /* One destructor overrides another if they are the same kind of |
1898 | destructor. */ | |
1899 | if (DECL_DESTRUCTOR_P (base_fndecl) && DECL_DESTRUCTOR_P (fndecl) | |
1900 | && special_function_p (base_fndecl) == special_function_p (fndecl)) | |
ca36f057 | 1901 | return 1; |
872f37f9 MM |
1902 | /* But a non-destructor never overrides a destructor, nor vice |
1903 | versa, nor do different kinds of destructors override | |
1904 | one-another. For example, a complete object destructor does not | |
1905 | override a deleting destructor. */ | |
0d9eb3ba | 1906 | if (DECL_DESTRUCTOR_P (base_fndecl) || DECL_DESTRUCTOR_P (fndecl)) |
ca36f057 | 1907 | return 0; |
872f37f9 | 1908 | |
a6c0d772 MM |
1909 | if (DECL_NAME (fndecl) == DECL_NAME (base_fndecl) |
1910 | || (DECL_CONV_FN_P (fndecl) | |
1911 | && DECL_CONV_FN_P (base_fndecl) | |
1912 | && same_type_p (DECL_CONV_FN_TYPE (fndecl), | |
1913 | DECL_CONV_FN_TYPE (base_fndecl)))) | |
83f2ccf4 | 1914 | { |
ca36f057 | 1915 | tree types, base_types; |
ca36f057 MM |
1916 | types = TYPE_ARG_TYPES (TREE_TYPE (fndecl)); |
1917 | base_types = TYPE_ARG_TYPES (TREE_TYPE (base_fndecl)); | |
1918 | if ((TYPE_QUALS (TREE_TYPE (TREE_VALUE (base_types))) | |
1919 | == TYPE_QUALS (TREE_TYPE (TREE_VALUE (types)))) | |
1920 | && compparms (TREE_CHAIN (base_types), TREE_CHAIN (types))) | |
1921 | return 1; | |
83f2ccf4 | 1922 | } |
ca36f057 | 1923 | return 0; |
83f2ccf4 MM |
1924 | } |
1925 | ||
9368208b MM |
1926 | /* Returns TRUE if DERIVED is a binfo containing the binfo BASE as a |
1927 | subobject. */ | |
1928 | ||
1929 | static bool | |
1930 | base_derived_from (tree derived, tree base) | |
1931 | { | |
dbbf88d1 NS |
1932 | tree probe; |
1933 | ||
1934 | for (probe = base; probe; probe = BINFO_INHERITANCE_CHAIN (probe)) | |
1935 | { | |
1936 | if (probe == derived) | |
1937 | return true; | |
1938 | else if (TREE_VIA_VIRTUAL (probe)) | |
1939 | /* If we meet a virtual base, we can't follow the inheritance | |
1940 | any more. See if the complete type of DERIVED contains | |
1941 | such a virtual base. */ | |
1942 | return purpose_member (BINFO_TYPE (probe), | |
1943 | CLASSTYPE_VBASECLASSES (BINFO_TYPE (derived))) | |
1944 | != NULL_TREE; | |
1945 | } | |
1946 | return false; | |
9368208b MM |
1947 | } |
1948 | ||
ca36f057 MM |
1949 | typedef struct find_final_overrider_data_s { |
1950 | /* The function for which we are trying to find a final overrider. */ | |
1951 | tree fn; | |
1952 | /* The base class in which the function was declared. */ | |
1953 | tree declaring_base; | |
1954 | /* The most derived class in the hierarchy. */ | |
1955 | tree most_derived_type; | |
9368208b | 1956 | /* The candidate overriders. */ |
78b45a24 | 1957 | tree candidates; |
cd0be382 | 1958 | /* Binfos which inherited virtually on the current path. */ |
dbbf88d1 | 1959 | tree vpath; |
ca36f057 | 1960 | } find_final_overrider_data; |
8d7a5379 | 1961 | |
ca36f057 | 1962 | /* Called from find_final_overrider via dfs_walk. */ |
8d7a5379 MM |
1963 | |
1964 | static tree | |
94edc4ab | 1965 | dfs_find_final_overrider (tree binfo, void* data) |
7177d104 | 1966 | { |
ca36f057 | 1967 | find_final_overrider_data *ffod = (find_final_overrider_data *) data; |
3c9d6359 | 1968 | |
dbbf88d1 NS |
1969 | if (binfo == ffod->declaring_base) |
1970 | { | |
1971 | /* We've found a path to the declaring base. Walk the path from | |
1972 | derived to base, looking for an overrider for FN. */ | |
1973 | tree path, probe, vpath; | |
1974 | ||
1975 | /* Build the path, using the inheritance chain and record of | |
1976 | virtual inheritance. */ | |
1977 | for (path = NULL_TREE, probe = binfo, vpath = ffod->vpath;;) | |
8d7a5379 | 1978 | { |
dbbf88d1 NS |
1979 | path = tree_cons (NULL_TREE, probe, path); |
1980 | if (same_type_p (BINFO_TYPE (probe), ffod->most_derived_type)) | |
1981 | break; | |
1982 | if (TREE_VIA_VIRTUAL (probe)) | |
1983 | { | |
1984 | probe = TREE_VALUE (vpath); | |
1985 | vpath = TREE_CHAIN (vpath); | |
1986 | } | |
1987 | else | |
1988 | probe = BINFO_INHERITANCE_CHAIN (probe); | |
1989 | } | |
1990 | /* Now walk path, looking for overrides. */ | |
1991 | for (; path; path = TREE_CHAIN (path)) | |
1992 | { | |
1993 | tree method = look_for_overrides_here | |
1994 | (BINFO_TYPE (TREE_VALUE (path)), ffod->fn); | |
1995 | ||
5e19c053 | 1996 | if (method) |
9368208b | 1997 | { |
dbbf88d1 | 1998 | tree *candidate = &ffod->candidates; |
9368208b | 1999 | path = TREE_VALUE (path); |
dbbf88d1 NS |
2000 | |
2001 | /* Remove any candidates overridden by this new function. */ | |
2002 | while (*candidate) | |
2003 | { | |
2004 | /* If *CANDIDATE overrides METHOD, then METHOD | |
2005 | cannot override anything else on the list. */ | |
2006 | if (base_derived_from (TREE_VALUE (*candidate), path)) | |
2007 | return NULL_TREE; | |
2008 | /* If METHOD overrides *CANDIDATE, remove *CANDIDATE. */ | |
2009 | if (base_derived_from (path, TREE_VALUE (*candidate))) | |
2010 | *candidate = TREE_CHAIN (*candidate); | |
2011 | else | |
2012 | candidate = &TREE_CHAIN (*candidate); | |
2013 | } | |
2014 | ||
2015 | /* Add the new function. */ | |
2016 | ffod->candidates = tree_cons (method, path, ffod->candidates); | |
9368208b MM |
2017 | break; |
2018 | } | |
5e19c053 | 2019 | } |
dbbf88d1 | 2020 | } |
5e19c053 | 2021 | |
dbbf88d1 NS |
2022 | return NULL_TREE; |
2023 | } | |
db3d8cde | 2024 | |
dbbf88d1 NS |
2025 | static tree |
2026 | dfs_find_final_overrider_q (tree derived, int ix, void *data) | |
2027 | { | |
2028 | tree binfo = BINFO_BASETYPE (derived, ix); | |
2029 | find_final_overrider_data *ffod = (find_final_overrider_data *) data; | |
78b45a24 | 2030 | |
dbbf88d1 NS |
2031 | if (TREE_VIA_VIRTUAL (binfo)) |
2032 | ffod->vpath = tree_cons (NULL_TREE, derived, ffod->vpath); | |
2033 | ||
2034 | return binfo; | |
2035 | } | |
dd42e135 | 2036 | |
dbbf88d1 NS |
2037 | static tree |
2038 | dfs_find_final_overrider_post (tree binfo, void *data) | |
2039 | { | |
2040 | find_final_overrider_data *ffod = (find_final_overrider_data *) data; | |
2041 | ||
2042 | if (TREE_VIA_VIRTUAL (binfo) && TREE_CHAIN (ffod->vpath)) | |
2043 | ffod->vpath = TREE_CHAIN (ffod->vpath); | |
2044 | ||
dd42e135 MM |
2045 | return NULL_TREE; |
2046 | } | |
2047 | ||
5e19c053 MM |
2048 | /* Returns a TREE_LIST whose TREE_PURPOSE is the final overrider for |
2049 | FN and whose TREE_VALUE is the binfo for the base where the | |
95675950 MM |
2050 | overriding occurs. BINFO (in the hierarchy dominated by the binfo |
2051 | DERIVED) is the base object in which FN is declared. */ | |
e92cc029 | 2052 | |
a292b002 | 2053 | static tree |
94edc4ab | 2054 | find_final_overrider (tree derived, tree binfo, tree fn) |
a292b002 | 2055 | { |
5e19c053 | 2056 | find_final_overrider_data ffod; |
a292b002 | 2057 | |
0e339752 | 2058 | /* Getting this right is a little tricky. This is valid: |
a292b002 | 2059 | |
5e19c053 MM |
2060 | struct S { virtual void f (); }; |
2061 | struct T { virtual void f (); }; | |
2062 | struct U : public S, public T { }; | |
a292b002 | 2063 | |
5e19c053 | 2064 | even though calling `f' in `U' is ambiguous. But, |
a292b002 | 2065 | |
5e19c053 MM |
2066 | struct R { virtual void f(); }; |
2067 | struct S : virtual public R { virtual void f (); }; | |
2068 | struct T : virtual public R { virtual void f (); }; | |
2069 | struct U : public S, public T { }; | |
dd42e135 | 2070 | |
d0cd8b44 | 2071 | is not -- there's no way to decide whether to put `S::f' or |
5e19c053 MM |
2072 | `T::f' in the vtable for `R'. |
2073 | ||
2074 | The solution is to look at all paths to BINFO. If we find | |
2075 | different overriders along any two, then there is a problem. */ | |
07fa4878 NS |
2076 | if (DECL_THUNK_P (fn)) |
2077 | fn = THUNK_TARGET (fn); | |
2078 | ||
5e19c053 MM |
2079 | ffod.fn = fn; |
2080 | ffod.declaring_base = binfo; | |
95675950 | 2081 | ffod.most_derived_type = BINFO_TYPE (derived); |
78b45a24 | 2082 | ffod.candidates = NULL_TREE; |
dbbf88d1 | 2083 | ffod.vpath = NULL_TREE; |
78b45a24 | 2084 | |
dbbf88d1 NS |
2085 | dfs_walk_real (derived, |
2086 | dfs_find_final_overrider, | |
2087 | dfs_find_final_overrider_post, | |
2088 | dfs_find_final_overrider_q, | |
2089 | &ffod); | |
5e19c053 | 2090 | |
78b45a24 | 2091 | /* If there was no winner, issue an error message. */ |
9368208b | 2092 | if (!ffod.candidates || TREE_CHAIN (ffod.candidates)) |
d0cd8b44 | 2093 | { |
95675950 MM |
2094 | error ("no unique final overrider for `%D' in `%T'", fn, |
2095 | BINFO_TYPE (derived)); | |
d0cd8b44 JM |
2096 | return error_mark_node; |
2097 | } | |
dd42e135 | 2098 | |
9368208b | 2099 | return ffod.candidates; |
a292b002 MS |
2100 | } |
2101 | ||
548502d3 MM |
2102 | /* Return the index of the vcall offset for FN when TYPE is used as a |
2103 | virtual base. */ | |
d0cd8b44 | 2104 | |
d0cd8b44 | 2105 | static tree |
548502d3 | 2106 | get_vcall_index (tree fn, tree type) |
d0cd8b44 | 2107 | { |
548502d3 | 2108 | tree v; |
d0cd8b44 | 2109 | |
548502d3 MM |
2110 | for (v = CLASSTYPE_VCALL_INDICES (type); v; v = TREE_CHAIN (v)) |
2111 | if ((DECL_DESTRUCTOR_P (fn) && DECL_DESTRUCTOR_P (TREE_PURPOSE (v))) | |
2112 | || same_signature_p (fn, TREE_PURPOSE (v))) | |
2113 | break; | |
2114 | ||
2115 | /* There should always be an appropriate index. */ | |
2116 | my_friendly_assert (v, 20021103); | |
2117 | ||
2118 | return TREE_VALUE (v); | |
d0cd8b44 | 2119 | } |
d0cd8b44 JM |
2120 | |
2121 | /* Update an entry in the vtable for BINFO, which is in the hierarchy | |
4639c5c6 | 2122 | dominated by T. FN has been overridden in BINFO; VIRTUALS points to the |
d0cd8b44 | 2123 | corresponding position in the BINFO_VIRTUALS list. */ |
4e7512c9 MM |
2124 | |
2125 | static void | |
a2ddc397 NS |
2126 | update_vtable_entry_for_fn (tree t, tree binfo, tree fn, tree* virtuals, |
2127 | unsigned ix) | |
4e7512c9 MM |
2128 | { |
2129 | tree b; | |
2130 | tree overrider; | |
4e7512c9 | 2131 | tree delta; |
31f8e4f3 | 2132 | tree virtual_base; |
d0cd8b44 | 2133 | tree first_defn; |
3cfabe60 NS |
2134 | tree overrider_fn, overrider_target; |
2135 | tree target_fn = DECL_THUNK_P (fn) ? THUNK_TARGET (fn) : fn; | |
2136 | tree over_return, base_return; | |
f11ee281 | 2137 | bool lost = false; |
4e7512c9 | 2138 | |
d0cd8b44 JM |
2139 | /* Find the nearest primary base (possibly binfo itself) which defines |
2140 | this function; this is the class the caller will convert to when | |
2141 | calling FN through BINFO. */ | |
2142 | for (b = binfo; ; b = get_primary_binfo (b)) | |
4e7512c9 | 2143 | { |
07fa4878 | 2144 | my_friendly_assert (b, 20021227); |
3cfabe60 | 2145 | if (look_for_overrides_here (BINFO_TYPE (b), target_fn)) |
31f8e4f3 | 2146 | break; |
f11ee281 JM |
2147 | |
2148 | /* The nearest definition is from a lost primary. */ | |
2149 | if (BINFO_LOST_PRIMARY_P (b)) | |
2150 | lost = true; | |
4e7512c9 | 2151 | } |
d0cd8b44 | 2152 | first_defn = b; |
4e7512c9 | 2153 | |
31f8e4f3 | 2154 | /* Find the final overrider. */ |
3cfabe60 | 2155 | overrider = find_final_overrider (TYPE_BINFO (t), b, target_fn); |
4e7512c9 MM |
2156 | if (overrider == error_mark_node) |
2157 | return; | |
3cfabe60 NS |
2158 | overrider_target = overrider_fn = TREE_PURPOSE (overrider); |
2159 | ||
9bcb9aae | 2160 | /* Check for adjusting covariant return types. */ |
3cfabe60 NS |
2161 | over_return = TREE_TYPE (TREE_TYPE (overrider_target)); |
2162 | base_return = TREE_TYPE (TREE_TYPE (target_fn)); | |
2163 | ||
2164 | if (POINTER_TYPE_P (over_return) | |
2165 | && TREE_CODE (over_return) == TREE_CODE (base_return) | |
2166 | && CLASS_TYPE_P (TREE_TYPE (over_return)) | |
2167 | && CLASS_TYPE_P (TREE_TYPE (base_return))) | |
2168 | { | |
2169 | /* If FN is a covariant thunk, we must figure out the adjustment | |
2170 | to the final base FN was converting to. As OVERRIDER_TARGET might | |
2171 | also be converting to the return type of FN, we have to | |
2172 | combine the two conversions here. */ | |
2173 | tree fixed_offset, virtual_offset; | |
2174 | ||
2175 | if (DECL_THUNK_P (fn)) | |
2176 | { | |
e00853fd | 2177 | my_friendly_assert (DECL_RESULT_THUNK_P (fn), 20031211); |
3cfabe60 NS |
2178 | fixed_offset = ssize_int (THUNK_FIXED_OFFSET (fn)); |
2179 | virtual_offset = THUNK_VIRTUAL_OFFSET (fn); | |
3cfabe60 NS |
2180 | } |
2181 | else | |
2182 | fixed_offset = virtual_offset = NULL_TREE; | |
4977bab6 | 2183 | |
e00853fd NS |
2184 | if (virtual_offset) |
2185 | /* Find the equivalent binfo within the return type of the | |
2186 | overriding function. We will want the vbase offset from | |
2187 | there. */ | |
2188 | virtual_offset = | |
2189 | TREE_VALUE (purpose_member | |
2190 | (BINFO_TYPE (virtual_offset), | |
2191 | CLASSTYPE_VBASECLASSES (TREE_TYPE (over_return)))); | |
2192 | else | |
3cfabe60 NS |
2193 | { |
2194 | /* There was no existing virtual thunk (which takes | |
cd0be382 | 2195 | precedence). */ |
3cfabe60 NS |
2196 | tree thunk_binfo; |
2197 | base_kind kind; | |
2198 | ||
2199 | thunk_binfo = lookup_base (TREE_TYPE (over_return), | |
2200 | TREE_TYPE (base_return), | |
2201 | ba_check | ba_quiet, &kind); | |
4e7512c9 | 2202 | |
3cfabe60 NS |
2203 | if (thunk_binfo && (kind == bk_via_virtual |
2204 | || !BINFO_OFFSET_ZEROP (thunk_binfo))) | |
2205 | { | |
bb885938 | 2206 | tree offset = convert (ssizetype, BINFO_OFFSET (thunk_binfo)); |
8d1f0f67 | 2207 | |
3cfabe60 NS |
2208 | if (kind == bk_via_virtual) |
2209 | { | |
2210 | /* We convert via virtual base. Find the virtual | |
2211 | base and adjust the fixed offset to be from there. */ | |
2212 | while (!TREE_VIA_VIRTUAL (thunk_binfo)) | |
2213 | thunk_binfo = BINFO_INHERITANCE_CHAIN (thunk_binfo); | |
dbbf88d1 NS |
2214 | |
2215 | virtual_offset = thunk_binfo; | |
bb885938 NS |
2216 | offset = size_diffop |
2217 | (offset, convert | |
2218 | (ssizetype, BINFO_OFFSET (virtual_offset))); | |
3cfabe60 NS |
2219 | } |
2220 | if (fixed_offset) | |
2221 | /* There was an existing fixed offset, this must be | |
2222 | from the base just converted to, and the base the | |
2223 | FN was thunking to. */ | |
2224 | fixed_offset = size_binop (PLUS_EXPR, fixed_offset, offset); | |
2225 | else | |
2226 | fixed_offset = offset; | |
2227 | } | |
2228 | } | |
2229 | ||
2230 | if (fixed_offset || virtual_offset) | |
2231 | /* Replace the overriding function with a covariant thunk. We | |
2232 | will emit the overriding function in its own slot as | |
9bcb9aae | 2233 | well. */ |
3cfabe60 NS |
2234 | overrider_fn = make_thunk (overrider_target, /*this_adjusting=*/0, |
2235 | fixed_offset, virtual_offset); | |
2236 | } | |
2237 | else | |
2238 | my_friendly_assert (!DECL_THUNK_P (fn), 20021231); | |
2239 | ||
31f8e4f3 MM |
2240 | /* Assume that we will produce a thunk that convert all the way to |
2241 | the final overrider, and not to an intermediate virtual base. */ | |
9ccf6541 | 2242 | virtual_base = NULL_TREE; |
31f8e4f3 | 2243 | |
f11ee281 | 2244 | /* See if we can convert to an intermediate virtual base first, and then |
3461fba7 | 2245 | use the vcall offset located there to finish the conversion. */ |
f11ee281 | 2246 | for (; b; b = BINFO_INHERITANCE_CHAIN (b)) |
4e7512c9 | 2247 | { |
d0cd8b44 JM |
2248 | /* If we find the final overrider, then we can stop |
2249 | walking. */ | |
1f84ec23 MM |
2250 | if (same_type_p (BINFO_TYPE (b), |
2251 | BINFO_TYPE (TREE_VALUE (overrider)))) | |
2252 | break; | |
31f8e4f3 | 2253 | |
d0cd8b44 JM |
2254 | /* If we find a virtual base, and we haven't yet found the |
2255 | overrider, then there is a virtual base between the | |
2256 | declaring base (first_defn) and the final overrider. */ | |
dbbf88d1 NS |
2257 | if (TREE_VIA_VIRTUAL (b)) |
2258 | { | |
2259 | virtual_base = b; | |
2260 | break; | |
2261 | } | |
4e7512c9 | 2262 | } |
4e7512c9 | 2263 | |
a2ddc397 NS |
2264 | if (overrider_fn != overrider_target && !virtual_base) |
2265 | { | |
2266 | /* The ABI specifies that a covariant thunk includes a mangling | |
2267 | for a this pointer adjustment. This-adjusting thunks that | |
2268 | override a function from a virtual base have a vcall | |
2269 | adjustment. When the virtual base in question is a primary | |
2270 | virtual base, we know the adjustments are zero, (and in the | |
2271 | non-covariant case, we would not use the thunk). | |
2272 | Unfortunately we didn't notice this could happen, when | |
2273 | designing the ABI and so never mandated that such a covariant | |
2274 | thunk should be emitted. Because we must use the ABI mandated | |
2275 | name, we must continue searching from the binfo where we | |
2276 | found the most recent definition of the function, towards the | |
2277 | primary binfo which first introduced the function into the | |
2278 | vtable. If that enters a virtual base, we must use a vcall | |
2279 | this-adjusting thunk. Bleah! */ | |
bb885938 NS |
2280 | tree probe = first_defn; |
2281 | ||
2282 | while ((probe = get_primary_binfo (probe)) | |
2283 | && (unsigned) list_length (BINFO_VIRTUALS (probe)) > ix) | |
2284 | if (TREE_VIA_VIRTUAL (probe)) | |
2285 | virtual_base = probe; | |
a2ddc397 | 2286 | |
a2ddc397 NS |
2287 | if (virtual_base) |
2288 | /* Even if we find a virtual base, the correct delta is | |
2289 | between the overrider and the binfo we're building a vtable | |
2290 | for. */ | |
2291 | goto virtual_covariant; | |
2292 | } | |
2293 | ||
d0cd8b44 JM |
2294 | /* Compute the constant adjustment to the `this' pointer. The |
2295 | `this' pointer, when this function is called, will point at BINFO | |
2296 | (or one of its primary bases, which are at the same offset). */ | |
31f8e4f3 | 2297 | if (virtual_base) |
20dde49d NS |
2298 | /* The `this' pointer needs to be adjusted from the declaration to |
2299 | the nearest virtual base. */ | |
bb885938 NS |
2300 | delta = size_diffop (convert (ssizetype, BINFO_OFFSET (virtual_base)), |
2301 | convert (ssizetype, BINFO_OFFSET (first_defn))); | |
f11ee281 JM |
2302 | else if (lost) |
2303 | /* If the nearest definition is in a lost primary, we don't need an | |
2304 | entry in our vtable. Except possibly in a constructor vtable, | |
2305 | if we happen to get our primary back. In that case, the offset | |
2306 | will be zero, as it will be a primary base. */ | |
2307 | delta = size_zero_node; | |
4e7512c9 | 2308 | else |
548502d3 MM |
2309 | /* The `this' pointer needs to be adjusted from pointing to |
2310 | BINFO to pointing at the base where the final overrider | |
2311 | appears. */ | |
a2ddc397 | 2312 | virtual_covariant: |
bb885938 NS |
2313 | delta = size_diffop (convert (ssizetype, |
2314 | BINFO_OFFSET (TREE_VALUE (overrider))), | |
2315 | convert (ssizetype, BINFO_OFFSET (binfo))); | |
4e7512c9 | 2316 | |
3cfabe60 | 2317 | modify_vtable_entry (t, binfo, overrider_fn, delta, virtuals); |
31f8e4f3 MM |
2318 | |
2319 | if (virtual_base) | |
548502d3 | 2320 | BV_VCALL_INDEX (*virtuals) |
3cfabe60 | 2321 | = get_vcall_index (overrider_target, BINFO_TYPE (virtual_base)); |
4e7512c9 MM |
2322 | } |
2323 | ||
8026246f | 2324 | /* Called from modify_all_vtables via dfs_walk. */ |
e92cc029 | 2325 | |
8026246f | 2326 | static tree |
94edc4ab | 2327 | dfs_modify_vtables (tree binfo, void* data) |
8026246f | 2328 | { |
9965d119 | 2329 | if (/* There's no need to modify the vtable for a non-virtual |
d0cd8b44 JM |
2330 | primary base; we're not going to use that vtable anyhow. |
2331 | We do still need to do this for virtual primary bases, as they | |
2332 | could become non-primary in a construction vtable. */ | |
9965d119 | 2333 | (!BINFO_PRIMARY_P (binfo) || TREE_VIA_VIRTUAL (binfo)) |
8026246f MM |
2334 | /* Similarly, a base without a vtable needs no modification. */ |
2335 | && CLASSTYPE_VFIELDS (BINFO_TYPE (binfo))) | |
7177d104 | 2336 | { |
a2ddc397 | 2337 | tree t = (tree) data; |
5e19c053 MM |
2338 | tree virtuals; |
2339 | tree old_virtuals; | |
a2ddc397 NS |
2340 | unsigned ix; |
2341 | ||
1f84ec23 | 2342 | make_new_vtable (t, binfo); |
5e19c053 MM |
2343 | |
2344 | /* Now, go through each of the virtual functions in the virtual | |
2345 | function table for BINFO. Find the final overrider, and | |
2346 | update the BINFO_VIRTUALS list appropriately. */ | |
a2ddc397 | 2347 | for (ix = 0, virtuals = BINFO_VIRTUALS (binfo), |
da3d4dfa | 2348 | old_virtuals = BINFO_VIRTUALS (TYPE_BINFO (BINFO_TYPE (binfo))); |
5e19c053 | 2349 | virtuals; |
a2ddc397 | 2350 | ix++, virtuals = TREE_CHAIN (virtuals), |
5e19c053 | 2351 | old_virtuals = TREE_CHAIN (old_virtuals)) |
4e7512c9 MM |
2352 | update_vtable_entry_for_fn (t, |
2353 | binfo, | |
2354 | BV_FN (old_virtuals), | |
a2ddc397 | 2355 | &virtuals, ix); |
7177d104 | 2356 | } |
8026246f | 2357 | |
dbbf88d1 | 2358 | BINFO_MARKED (binfo) = 1; |
8026246f MM |
2359 | |
2360 | return NULL_TREE; | |
2361 | } | |
2362 | ||
a68ad5bd MM |
2363 | /* Update all of the primary and secondary vtables for T. Create new |
2364 | vtables as required, and initialize their RTTI information. Each | |
e6858a84 NS |
2365 | of the functions in VIRTUALS is declared in T and may override a |
2366 | virtual function from a base class; find and modify the appropriate | |
2367 | entries to point to the overriding functions. Returns a list, in | |
2368 | declaration order, of the virtual functions that are declared in T, | |
2369 | but do not appear in the primary base class vtable, and which | |
2370 | should therefore be appended to the end of the vtable for T. */ | |
a68ad5bd MM |
2371 | |
2372 | static tree | |
94edc4ab | 2373 | modify_all_vtables (tree t, tree virtuals) |
8026246f | 2374 | { |
3461fba7 NS |
2375 | tree binfo = TYPE_BINFO (t); |
2376 | tree *fnsp; | |
a68ad5bd | 2377 | |
5e19c053 | 2378 | /* Update all of the vtables. */ |
dbbf88d1 NS |
2379 | dfs_walk (binfo, dfs_modify_vtables, unmarkedp, t); |
2380 | dfs_walk (binfo, dfs_unmark, markedp, t); | |
a68ad5bd | 2381 | |
e6858a84 NS |
2382 | /* Add virtual functions not already in our primary vtable. These |
2383 | will be both those introduced by this class, and those overridden | |
2384 | from secondary bases. It does not include virtuals merely | |
2385 | inherited from secondary bases. */ | |
2386 | for (fnsp = &virtuals; *fnsp; ) | |
a68ad5bd | 2387 | { |
3461fba7 | 2388 | tree fn = TREE_VALUE (*fnsp); |
a68ad5bd | 2389 | |
e6858a84 NS |
2390 | if (!value_member (fn, BINFO_VIRTUALS (binfo)) |
2391 | || DECL_VINDEX (fn) == error_mark_node) | |
a68ad5bd | 2392 | { |
3461fba7 NS |
2393 | /* We don't need to adjust the `this' pointer when |
2394 | calling this function. */ | |
2395 | BV_DELTA (*fnsp) = integer_zero_node; | |
2396 | BV_VCALL_INDEX (*fnsp) = NULL_TREE; | |
2397 | ||
e6858a84 | 2398 | /* This is a function not already in our vtable. Keep it. */ |
3461fba7 | 2399 | fnsp = &TREE_CHAIN (*fnsp); |
a68ad5bd | 2400 | } |
3461fba7 NS |
2401 | else |
2402 | /* We've already got an entry for this function. Skip it. */ | |
2403 | *fnsp = TREE_CHAIN (*fnsp); | |
a68ad5bd | 2404 | } |
e93ee644 | 2405 | |
e6858a84 | 2406 | return virtuals; |
7177d104 MS |
2407 | } |
2408 | ||
7d5b8b11 MM |
2409 | /* Get the base virtual function declarations in T that have the |
2410 | indicated NAME. */ | |
e92cc029 | 2411 | |
5ddc28a5 | 2412 | static tree |
94edc4ab | 2413 | get_basefndecls (tree name, tree t) |
9e9ff709 | 2414 | { |
7d5b8b11 | 2415 | tree methods; |
9e9ff709 | 2416 | tree base_fndecls = NULL_TREE; |
7d5b8b11 MM |
2417 | int n_baseclasses = CLASSTYPE_N_BASECLASSES (t); |
2418 | int i; | |
9e9ff709 | 2419 | |
3d1df1fa MM |
2420 | /* Find virtual functions in T with the indicated NAME. */ |
2421 | i = lookup_fnfields_1 (t, name); | |
2422 | if (i != -1) | |
2423 | for (methods = TREE_VEC_ELT (CLASSTYPE_METHOD_VEC (t), i); | |
2424 | methods; | |
2425 | methods = OVL_NEXT (methods)) | |
2426 | { | |
2427 | tree method = OVL_CURRENT (methods); | |
2428 | ||
2429 | if (TREE_CODE (method) == FUNCTION_DECL | |
2430 | && DECL_VINDEX (method)) | |
2431 | base_fndecls = tree_cons (NULL_TREE, method, base_fndecls); | |
2432 | } | |
9e9ff709 MS |
2433 | |
2434 | if (base_fndecls) | |
2435 | return base_fndecls; | |
2436 | ||
2437 | for (i = 0; i < n_baseclasses; i++) | |
2438 | { | |
7d5b8b11 MM |
2439 | tree basetype = TYPE_BINFO_BASETYPE (t, i); |
2440 | base_fndecls = chainon (get_basefndecls (name, basetype), | |
9e9ff709 MS |
2441 | base_fndecls); |
2442 | } | |
2443 | ||
2444 | return base_fndecls; | |
2445 | } | |
2446 | ||
2ee887f2 MS |
2447 | /* If this declaration supersedes the declaration of |
2448 | a method declared virtual in the base class, then | |
2449 | mark this field as being virtual as well. */ | |
2450 | ||
bd6dd845 | 2451 | static void |
94edc4ab | 2452 | check_for_override (tree decl, tree ctype) |
2ee887f2 | 2453 | { |
cbb40945 NS |
2454 | if (TREE_CODE (decl) == TEMPLATE_DECL) |
2455 | /* In [temp.mem] we have: | |
2ee887f2 | 2456 | |
cbb40945 NS |
2457 | A specialization of a member function template does not |
2458 | override a virtual function from a base class. */ | |
2459 | return; | |
2460 | if ((DECL_DESTRUCTOR_P (decl) | |
a6c0d772 MM |
2461 | || IDENTIFIER_VIRTUAL_P (DECL_NAME (decl)) |
2462 | || DECL_CONV_FN_P (decl)) | |
cbb40945 NS |
2463 | && look_for_overrides (ctype, decl) |
2464 | && !DECL_STATIC_FUNCTION_P (decl)) | |
e6858a84 NS |
2465 | /* Set DECL_VINDEX to a value that is neither an INTEGER_CST nor |
2466 | the error_mark_node so that we know it is an overriding | |
2467 | function. */ | |
2468 | DECL_VINDEX (decl) = decl; | |
2469 | ||
cbb40945 | 2470 | if (DECL_VIRTUAL_P (decl)) |
2ee887f2 | 2471 | { |
e6858a84 | 2472 | if (!DECL_VINDEX (decl)) |
2ee887f2 MS |
2473 | DECL_VINDEX (decl) = error_mark_node; |
2474 | IDENTIFIER_VIRTUAL_P (DECL_NAME (decl)) = 1; | |
2475 | } | |
2476 | } | |
2477 | ||
fc378698 MS |
2478 | /* Warn about hidden virtual functions that are not overridden in t. |
2479 | We know that constructors and destructors don't apply. */ | |
e92cc029 | 2480 | |
9e9ff709 | 2481 | void |
94edc4ab | 2482 | warn_hidden (tree t) |
9e9ff709 MS |
2483 | { |
2484 | tree method_vec = CLASSTYPE_METHOD_VEC (t); | |
2485 | int n_methods = method_vec ? TREE_VEC_LENGTH (method_vec) : 0; | |
2486 | int i; | |
2487 | ||
2488 | /* We go through each separately named virtual function. */ | |
61a127b3 | 2489 | for (i = 2; i < n_methods && TREE_VEC_ELT (method_vec, i); ++i) |
9e9ff709 | 2490 | { |
7d5b8b11 MM |
2491 | tree fns; |
2492 | tree name; | |
2493 | tree fndecl; | |
2494 | tree base_fndecls; | |
2495 | int j; | |
2496 | ||
2497 | /* All functions in this slot in the CLASSTYPE_METHOD_VEC will | |
2498 | have the same name. Figure out what name that is. */ | |
2499 | name = DECL_NAME (OVL_CURRENT (TREE_VEC_ELT (method_vec, i))); | |
2500 | /* There are no possibly hidden functions yet. */ | |
2501 | base_fndecls = NULL_TREE; | |
2502 | /* Iterate through all of the base classes looking for possibly | |
2503 | hidden functions. */ | |
2504 | for (j = 0; j < CLASSTYPE_N_BASECLASSES (t); j++) | |
a4832853 | 2505 | { |
7d5b8b11 MM |
2506 | tree basetype = TYPE_BINFO_BASETYPE (t, j); |
2507 | base_fndecls = chainon (get_basefndecls (name, basetype), | |
2508 | base_fndecls); | |
a4832853 JM |
2509 | } |
2510 | ||
00a17e31 | 2511 | /* If there are no functions to hide, continue. */ |
7d5b8b11 | 2512 | if (!base_fndecls) |
9e9ff709 MS |
2513 | continue; |
2514 | ||
00a17e31 | 2515 | /* Remove any overridden functions. */ |
7d5b8b11 | 2516 | for (fns = TREE_VEC_ELT (method_vec, i); fns; fns = OVL_NEXT (fns)) |
9e9ff709 | 2517 | { |
7d5b8b11 MM |
2518 | fndecl = OVL_CURRENT (fns); |
2519 | if (DECL_VINDEX (fndecl)) | |
2520 | { | |
2521 | tree *prev = &base_fndecls; | |
2522 | ||
2523 | while (*prev) | |
2524 | /* If the method from the base class has the same | |
2525 | signature as the method from the derived class, it | |
2526 | has been overridden. */ | |
2527 | if (same_signature_p (fndecl, TREE_VALUE (*prev))) | |
2528 | *prev = TREE_CHAIN (*prev); | |
2529 | else | |
2530 | prev = &TREE_CHAIN (*prev); | |
2531 | } | |
9e9ff709 MS |
2532 | } |
2533 | ||
9e9ff709 MS |
2534 | /* Now give a warning for all base functions without overriders, |
2535 | as they are hidden. */ | |
7d5b8b11 MM |
2536 | while (base_fndecls) |
2537 | { | |
2538 | /* Here we know it is a hider, and no overrider exists. */ | |
2539 | cp_warning_at ("`%D' was hidden", TREE_VALUE (base_fndecls)); | |
2540 | cp_warning_at (" by `%D'", | |
2541 | OVL_CURRENT (TREE_VEC_ELT (method_vec, i))); | |
2542 | base_fndecls = TREE_CHAIN (base_fndecls); | |
2543 | } | |
9e9ff709 MS |
2544 | } |
2545 | } | |
2546 | ||
2547 | /* Check for things that are invalid. There are probably plenty of other | |
2548 | things we should check for also. */ | |
e92cc029 | 2549 | |
9e9ff709 | 2550 | static void |
94edc4ab | 2551 | finish_struct_anon (tree t) |
9e9ff709 MS |
2552 | { |
2553 | tree field; | |
f90cdf34 | 2554 | |
9e9ff709 MS |
2555 | for (field = TYPE_FIELDS (t); field; field = TREE_CHAIN (field)) |
2556 | { | |
2557 | if (TREE_STATIC (field)) | |
2558 | continue; | |
2559 | if (TREE_CODE (field) != FIELD_DECL) | |
2560 | continue; | |
2561 | ||
2562 | if (DECL_NAME (field) == NULL_TREE | |
6bdb8141 | 2563 | && ANON_AGGR_TYPE_P (TREE_TYPE (field))) |
9e9ff709 | 2564 | { |
f90cdf34 MT |
2565 | tree elt = TYPE_FIELDS (TREE_TYPE (field)); |
2566 | for (; elt; elt = TREE_CHAIN (elt)) | |
9e9ff709 | 2567 | { |
b7076960 MM |
2568 | /* We're generally only interested in entities the user |
2569 | declared, but we also find nested classes by noticing | |
2570 | the TYPE_DECL that we create implicitly. You're | |
2571 | allowed to put one anonymous union inside another, | |
6f32162a JM |
2572 | though, so we explicitly tolerate that. We use |
2573 | TYPE_ANONYMOUS_P rather than ANON_AGGR_TYPE_P so that | |
2574 | we also allow unnamed types used for defining fields. */ | |
b7076960 MM |
2575 | if (DECL_ARTIFICIAL (elt) |
2576 | && (!DECL_IMPLICIT_TYPEDEF_P (elt) | |
6f32162a | 2577 | || TYPE_ANONYMOUS_P (TREE_TYPE (elt)))) |
9e9ff709 MS |
2578 | continue; |
2579 | ||
a723baf1 | 2580 | if (constructor_name_p (DECL_NAME (elt), t)) |
cb9a3ff8 | 2581 | cp_pedwarn_at ("ISO C++ forbids member `%D' with same name as enclosing class", |
f90cdf34 | 2582 | elt); |
8ebeee52 | 2583 | |
f90cdf34 | 2584 | if (TREE_CODE (elt) != FIELD_DECL) |
8ebeee52 JM |
2585 | { |
2586 | cp_pedwarn_at ("`%#D' invalid; an anonymous union can only have non-static data members", | |
f90cdf34 | 2587 | elt); |
8ebeee52 JM |
2588 | continue; |
2589 | } | |
2590 | ||
f90cdf34 | 2591 | if (TREE_PRIVATE (elt)) |
8251199e | 2592 | cp_pedwarn_at ("private member `%#D' in anonymous union", |
f90cdf34 MT |
2593 | elt); |
2594 | else if (TREE_PROTECTED (elt)) | |
8251199e | 2595 | cp_pedwarn_at ("protected member `%#D' in anonymous union", |
f90cdf34 | 2596 | elt); |
fc378698 | 2597 | |
f90cdf34 MT |
2598 | TREE_PRIVATE (elt) = TREE_PRIVATE (field); |
2599 | TREE_PROTECTED (elt) = TREE_PROTECTED (field); | |
9e9ff709 MS |
2600 | } |
2601 | } | |
2602 | } | |
2603 | } | |
2604 | ||
7088fca9 KL |
2605 | /* Add T to CLASSTYPE_DECL_LIST of current_class_type which |
2606 | will be used later during class template instantiation. | |
2607 | When FRIEND_P is zero, T can be a static member data (VAR_DECL), | |
2608 | a non-static member data (FIELD_DECL), a member function | |
2609 | (FUNCTION_DECL), a nested type (RECORD_TYPE, ENUM_TYPE), | |
2610 | a typedef (TYPE_DECL) or a member class template (TEMPLATE_DECL) | |
2611 | When FRIEND_P is nonzero, T is either a friend class | |
2612 | (RECORD_TYPE, TEMPLATE_DECL) or a friend function | |
2613 | (FUNCTION_DECL, TEMPLATE_DECL). */ | |
2614 | ||
2615 | void | |
94edc4ab | 2616 | maybe_add_class_template_decl_list (tree type, tree t, int friend_p) |
7088fca9 KL |
2617 | { |
2618 | /* Save some memory by not creating TREE_LIST if TYPE is not template. */ | |
2619 | if (CLASSTYPE_TEMPLATE_INFO (type)) | |
2620 | CLASSTYPE_DECL_LIST (type) | |
2621 | = tree_cons (friend_p ? NULL_TREE : type, | |
2622 | t, CLASSTYPE_DECL_LIST (type)); | |
2623 | } | |
2624 | ||
61a127b3 MM |
2625 | /* Create default constructors, assignment operators, and so forth for |
2626 | the type indicated by T, if they are needed. | |
2627 | CANT_HAVE_DEFAULT_CTOR, CANT_HAVE_CONST_CTOR, and | |
9eb71d8c MM |
2628 | CANT_HAVE_CONST_ASSIGNMENT are nonzero if, for whatever reason, the |
2629 | class cannot have a default constructor, copy constructor taking a | |
2630 | const reference argument, or an assignment operator taking a const | |
2631 | reference, respectively. If a virtual destructor is created, its | |
2632 | DECL is returned; otherwise the return value is NULL_TREE. */ | |
61a127b3 | 2633 | |
f72ab53b | 2634 | static void |
94edc4ab NN |
2635 | add_implicitly_declared_members (tree t, |
2636 | int cant_have_default_ctor, | |
2637 | int cant_have_const_cctor, | |
2638 | int cant_have_const_assignment) | |
61a127b3 MM |
2639 | { |
2640 | tree default_fn; | |
2641 | tree implicit_fns = NULL_TREE; | |
61a127b3 MM |
2642 | tree virtual_dtor = NULL_TREE; |
2643 | tree *f; | |
2644 | ||
e23bd218 IR |
2645 | ++adding_implicit_members; |
2646 | ||
61a127b3 | 2647 | /* Destructor. */ |
834c6dff | 2648 | if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (t) && !TYPE_HAS_DESTRUCTOR (t)) |
61a127b3 | 2649 | { |
9eb71d8c | 2650 | default_fn = implicitly_declare_fn (sfk_destructor, t, /*const_p=*/0); |
61a127b3 MM |
2651 | check_for_override (default_fn, t); |
2652 | ||
2653 | /* If we couldn't make it work, then pretend we didn't need it. */ | |
2654 | if (default_fn == void_type_node) | |
834c6dff | 2655 | TYPE_HAS_NONTRIVIAL_DESTRUCTOR (t) = 0; |
61a127b3 MM |
2656 | else |
2657 | { | |
2658 | TREE_CHAIN (default_fn) = implicit_fns; | |
2659 | implicit_fns = default_fn; | |
2660 | ||
2661 | if (DECL_VINDEX (default_fn)) | |
2662 | virtual_dtor = default_fn; | |
2663 | } | |
2664 | } | |
834c6dff MM |
2665 | else |
2666 | /* Any non-implicit destructor is non-trivial. */ | |
2667 | TYPE_HAS_NONTRIVIAL_DESTRUCTOR (t) |= TYPE_HAS_DESTRUCTOR (t); | |
61a127b3 MM |
2668 | |
2669 | /* Default constructor. */ | |
6eabb241 | 2670 | if (! TYPE_HAS_CONSTRUCTOR (t) && ! cant_have_default_ctor) |
61a127b3 | 2671 | { |
9eb71d8c | 2672 | default_fn = implicitly_declare_fn (sfk_constructor, t, /*const_p=*/0); |
61a127b3 MM |
2673 | TREE_CHAIN (default_fn) = implicit_fns; |
2674 | implicit_fns = default_fn; | |
2675 | } | |
2676 | ||
2677 | /* Copy constructor. */ | |
6eabb241 | 2678 | if (! TYPE_HAS_INIT_REF (t) && ! TYPE_FOR_JAVA (t)) |
61a127b3 MM |
2679 | { |
2680 | /* ARM 12.18: You get either X(X&) or X(const X&), but | |
2681 | not both. --Chip */ | |
9eb71d8c MM |
2682 | default_fn |
2683 | = implicitly_declare_fn (sfk_copy_constructor, t, | |
2684 | /*const_p=*/!cant_have_const_cctor); | |
61a127b3 MM |
2685 | TREE_CHAIN (default_fn) = implicit_fns; |
2686 | implicit_fns = default_fn; | |
2687 | } | |
2688 | ||
2689 | /* Assignment operator. */ | |
6eabb241 | 2690 | if (! TYPE_HAS_ASSIGN_REF (t) && ! TYPE_FOR_JAVA (t)) |
61a127b3 | 2691 | { |
9eb71d8c MM |
2692 | default_fn |
2693 | = implicitly_declare_fn (sfk_assignment_operator, t, | |
2694 | /*const_p=*/!cant_have_const_assignment); | |
61a127b3 MM |
2695 | TREE_CHAIN (default_fn) = implicit_fns; |
2696 | implicit_fns = default_fn; | |
2697 | } | |
2698 | ||
2699 | /* Now, hook all of the new functions on to TYPE_METHODS, | |
2700 | and add them to the CLASSTYPE_METHOD_VEC. */ | |
2701 | for (f = &implicit_fns; *f; f = &TREE_CHAIN (*f)) | |
7088fca9 KL |
2702 | { |
2703 | add_method (t, *f, /*error_p=*/0); | |
2704 | maybe_add_class_template_decl_list (current_class_type, *f, /*friend_p=*/0); | |
2705 | } | |
f72ab53b MM |
2706 | if (abi_version_at_least (2)) |
2707 | /* G++ 3.2 put the implicit destructor at the *beginning* of the | |
2708 | list, which cause the destructor to be emitted in an incorrect | |
2709 | location in the vtable. */ | |
2710 | TYPE_METHODS (t) = chainon (TYPE_METHODS (t), implicit_fns); | |
2711 | else | |
2712 | { | |
2713 | if (warn_abi && virtual_dtor) | |
2714 | warning ("vtable layout for class `%T' may not be ABI-compliant " | |
2715 | "and may change in a future version of GCC due to implicit " | |
2716 | "virtual destructor", | |
2717 | t); | |
2718 | *f = TYPE_METHODS (t); | |
2719 | TYPE_METHODS (t) = implicit_fns; | |
2720 | } | |
61a127b3 | 2721 | |
e23bd218 | 2722 | --adding_implicit_members; |
61a127b3 MM |
2723 | } |
2724 | ||
f90cdf34 MT |
2725 | /* Subroutine of finish_struct_1. Recursively count the number of fields |
2726 | in TYPE, including anonymous union members. */ | |
2727 | ||
2728 | static int | |
94edc4ab | 2729 | count_fields (tree fields) |
f90cdf34 MT |
2730 | { |
2731 | tree x; | |
2732 | int n_fields = 0; | |
2733 | for (x = fields; x; x = TREE_CHAIN (x)) | |
2734 | { | |
2735 | if (TREE_CODE (x) == FIELD_DECL && ANON_AGGR_TYPE_P (TREE_TYPE (x))) | |
2736 | n_fields += count_fields (TYPE_FIELDS (TREE_TYPE (x))); | |
2737 | else | |
2738 | n_fields += 1; | |
2739 | } | |
2740 | return n_fields; | |
2741 | } | |
2742 | ||
2743 | /* Subroutine of finish_struct_1. Recursively add all the fields in the | |
d07605f5 | 2744 | TREE_LIST FIELDS to the SORTED_FIELDS_TYPE elts, starting at offset IDX. */ |
f90cdf34 MT |
2745 | |
2746 | static int | |
d07605f5 | 2747 | add_fields_to_record_type (tree fields, struct sorted_fields_type *field_vec, int idx) |
f90cdf34 MT |
2748 | { |
2749 | tree x; | |
2750 | for (x = fields; x; x = TREE_CHAIN (x)) | |
2751 | { | |
2752 | if (TREE_CODE (x) == FIELD_DECL && ANON_AGGR_TYPE_P (TREE_TYPE (x))) | |
d07605f5 | 2753 | idx = add_fields_to_record_type (TYPE_FIELDS (TREE_TYPE (x)), field_vec, idx); |
f90cdf34 | 2754 | else |
d07605f5 | 2755 | field_vec->elts[idx++] = x; |
f90cdf34 MT |
2756 | } |
2757 | return idx; | |
2758 | } | |
2759 | ||
1e30f9b4 MM |
2760 | /* FIELD is a bit-field. We are finishing the processing for its |
2761 | enclosing type. Issue any appropriate messages and set appropriate | |
2762 | flags. */ | |
2763 | ||
2764 | static void | |
94edc4ab | 2765 | check_bitfield_decl (tree field) |
1e30f9b4 MM |
2766 | { |
2767 | tree type = TREE_TYPE (field); | |
cd8ed629 | 2768 | tree w = NULL_TREE; |
1e30f9b4 | 2769 | |
cd8ed629 | 2770 | /* Detect invalid bit-field type. */ |
1e30f9b4 MM |
2771 | if (DECL_INITIAL (field) |
2772 | && ! INTEGRAL_TYPE_P (TREE_TYPE (field))) | |
2773 | { | |
2774 | cp_error_at ("bit-field `%#D' with non-integral type", field); | |
cd8ed629 | 2775 | w = error_mark_node; |
1e30f9b4 MM |
2776 | } |
2777 | ||
2778 | /* Detect and ignore out of range field width. */ | |
2779 | if (DECL_INITIAL (field)) | |
2780 | { | |
cd8ed629 | 2781 | w = DECL_INITIAL (field); |
1e30f9b4 MM |
2782 | |
2783 | /* Avoid the non_lvalue wrapper added by fold for PLUS_EXPRs. */ | |
2784 | STRIP_NOPS (w); | |
2785 | ||
2786 | /* detect invalid field size. */ | |
2787 | if (TREE_CODE (w) == CONST_DECL) | |
2788 | w = DECL_INITIAL (w); | |
fc611ce0 | 2789 | else |
1e30f9b4 MM |
2790 | w = decl_constant_value (w); |
2791 | ||
2792 | if (TREE_CODE (w) != INTEGER_CST) | |
2793 | { | |
2794 | cp_error_at ("bit-field `%D' width not an integer constant", | |
2795 | field); | |
cd8ed629 | 2796 | w = error_mark_node; |
1e30f9b4 | 2797 | } |
05bccae2 | 2798 | else if (tree_int_cst_sgn (w) < 0) |
1e30f9b4 | 2799 | { |
1e30f9b4 | 2800 | cp_error_at ("negative width in bit-field `%D'", field); |
cd8ed629 | 2801 | w = error_mark_node; |
1e30f9b4 | 2802 | } |
05bccae2 | 2803 | else if (integer_zerop (w) && DECL_NAME (field) != 0) |
1e30f9b4 | 2804 | { |
1e30f9b4 | 2805 | cp_error_at ("zero width for bit-field `%D'", field); |
cd8ed629 | 2806 | w = error_mark_node; |
1e30f9b4 | 2807 | } |
05bccae2 | 2808 | else if (compare_tree_int (w, TYPE_PRECISION (type)) > 0 |
1e30f9b4 MM |
2809 | && TREE_CODE (type) != ENUMERAL_TYPE |
2810 | && TREE_CODE (type) != BOOLEAN_TYPE) | |
2811 | cp_warning_at ("width of `%D' exceeds its type", field); | |
2812 | else if (TREE_CODE (type) == ENUMERAL_TYPE | |
05bccae2 RK |
2813 | && (0 > compare_tree_int (w, |
2814 | min_precision (TYPE_MIN_VALUE (type), | |
2815 | TREE_UNSIGNED (type))) | |
2816 | || 0 > compare_tree_int (w, | |
2817 | min_precision | |
2818 | (TYPE_MAX_VALUE (type), | |
2819 | TREE_UNSIGNED (type))))) | |
1e30f9b4 MM |
2820 | cp_warning_at ("`%D' is too small to hold all values of `%#T'", |
2821 | field, type); | |
cd8ed629 MM |
2822 | } |
2823 | ||
2824 | /* Remove the bit-field width indicator so that the rest of the | |
2825 | compiler does not treat that value as an initializer. */ | |
2826 | DECL_INITIAL (field) = NULL_TREE; | |
1e30f9b4 | 2827 | |
cd8ed629 MM |
2828 | if (w != error_mark_node) |
2829 | { | |
2830 | DECL_SIZE (field) = convert (bitsizetype, w); | |
2831 | DECL_BIT_FIELD (field) = 1; | |
1e30f9b4 MM |
2832 | } |
2833 | else | |
cd8ed629 MM |
2834 | { |
2835 | /* Non-bit-fields are aligned for their type. */ | |
2836 | DECL_BIT_FIELD (field) = 0; | |
2837 | CLEAR_DECL_C_BIT_FIELD (field); | |
cd8ed629 | 2838 | } |
1e30f9b4 MM |
2839 | } |
2840 | ||
2841 | /* FIELD is a non bit-field. We are finishing the processing for its | |
2842 | enclosing type T. Issue any appropriate messages and set appropriate | |
2843 | flags. */ | |
2844 | ||
2845 | static void | |
94edc4ab NN |
2846 | check_field_decl (tree field, |
2847 | tree t, | |
2848 | int* cant_have_const_ctor, | |
2849 | int* cant_have_default_ctor, | |
2850 | int* no_const_asn_ref, | |
2851 | int* any_default_members) | |
1e30f9b4 MM |
2852 | { |
2853 | tree type = strip_array_types (TREE_TYPE (field)); | |
2854 | ||
2855 | /* An anonymous union cannot contain any fields which would change | |
2856 | the settings of CANT_HAVE_CONST_CTOR and friends. */ | |
2857 | if (ANON_UNION_TYPE_P (type)) | |
2858 | ; | |
2859 | /* And, we don't set TYPE_HAS_CONST_INIT_REF, etc., for anonymous | |
2860 | structs. So, we recurse through their fields here. */ | |
2861 | else if (ANON_AGGR_TYPE_P (type)) | |
2862 | { | |
2863 | tree fields; | |
2864 | ||
2865 | for (fields = TYPE_FIELDS (type); fields; fields = TREE_CHAIN (fields)) | |
17aec3eb | 2866 | if (TREE_CODE (fields) == FIELD_DECL && !DECL_C_BIT_FIELD (field)) |
1e30f9b4 MM |
2867 | check_field_decl (fields, t, cant_have_const_ctor, |
2868 | cant_have_default_ctor, no_const_asn_ref, | |
2869 | any_default_members); | |
2870 | } | |
2871 | /* Check members with class type for constructors, destructors, | |
2872 | etc. */ | |
2873 | else if (CLASS_TYPE_P (type)) | |
2874 | { | |
2875 | /* Never let anything with uninheritable virtuals | |
2876 | make it through without complaint. */ | |
2877 | abstract_virtuals_error (field, type); | |
2878 | ||
2879 | if (TREE_CODE (t) == UNION_TYPE) | |
2880 | { | |
2881 | if (TYPE_NEEDS_CONSTRUCTING (type)) | |
2882 | cp_error_at ("member `%#D' with constructor not allowed in union", | |
2883 | field); | |
834c6dff | 2884 | if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type)) |
1e30f9b4 MM |
2885 | cp_error_at ("member `%#D' with destructor not allowed in union", |
2886 | field); | |
2887 | if (TYPE_HAS_COMPLEX_ASSIGN_REF (type)) | |
2888 | cp_error_at ("member `%#D' with copy assignment operator not allowed in union", | |
2889 | field); | |
2890 | } | |
2891 | else | |
2892 | { | |
2893 | TYPE_NEEDS_CONSTRUCTING (t) |= TYPE_NEEDS_CONSTRUCTING (type); | |
834c6dff MM |
2894 | TYPE_HAS_NONTRIVIAL_DESTRUCTOR (t) |
2895 | |= TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type); | |
1e30f9b4 MM |
2896 | TYPE_HAS_COMPLEX_ASSIGN_REF (t) |= TYPE_HAS_COMPLEX_ASSIGN_REF (type); |
2897 | TYPE_HAS_COMPLEX_INIT_REF (t) |= TYPE_HAS_COMPLEX_INIT_REF (type); | |
2898 | } | |
2899 | ||
2900 | if (!TYPE_HAS_CONST_INIT_REF (type)) | |
2901 | *cant_have_const_ctor = 1; | |
2902 | ||
2903 | if (!TYPE_HAS_CONST_ASSIGN_REF (type)) | |
2904 | *no_const_asn_ref = 1; | |
2905 | ||
2906 | if (TYPE_HAS_CONSTRUCTOR (type) | |
2907 | && ! TYPE_HAS_DEFAULT_CONSTRUCTOR (type)) | |
2908 | *cant_have_default_ctor = 1; | |
2909 | } | |
2910 | if (DECL_INITIAL (field) != NULL_TREE) | |
2911 | { | |
2912 | /* `build_class_init_list' does not recognize | |
2913 | non-FIELD_DECLs. */ | |
2914 | if (TREE_CODE (t) == UNION_TYPE && any_default_members != 0) | |
04d6ccbd | 2915 | error ("multiple fields in union `%T' initialized", t); |
1e30f9b4 MM |
2916 | *any_default_members = 1; |
2917 | } | |
6bb88f3b | 2918 | } |
1e30f9b4 | 2919 | |
08b962b0 MM |
2920 | /* Check the data members (both static and non-static), class-scoped |
2921 | typedefs, etc., appearing in the declaration of T. Issue | |
2922 | appropriate diagnostics. Sets ACCESS_DECLS to a list (in | |
2923 | declaration order) of access declarations; each TREE_VALUE in this | |
2924 | list is a USING_DECL. | |
8d08fdba | 2925 | |
08b962b0 | 2926 | In addition, set the following flags: |
8d08fdba | 2927 | |
08b962b0 MM |
2928 | EMPTY_P |
2929 | The class is empty, i.e., contains no non-static data members. | |
8d08fdba | 2930 | |
08b962b0 MM |
2931 | CANT_HAVE_DEFAULT_CTOR_P |
2932 | This class cannot have an implicitly generated default | |
2933 | constructor. | |
8d08fdba | 2934 | |
08b962b0 MM |
2935 | CANT_HAVE_CONST_CTOR_P |
2936 | This class cannot have an implicitly generated copy constructor | |
2937 | taking a const reference. | |
8d08fdba | 2938 | |
08b962b0 MM |
2939 | CANT_HAVE_CONST_ASN_REF |
2940 | This class cannot have an implicitly generated assignment | |
2941 | operator taking a const reference. | |
8d08fdba | 2942 | |
08b962b0 MM |
2943 | All of these flags should be initialized before calling this |
2944 | function. | |
8d08fdba | 2945 | |
08b962b0 MM |
2946 | Returns a pointer to the end of the TYPE_FIELDs chain; additional |
2947 | fields can be added by adding to this chain. */ | |
8d08fdba | 2948 | |
607cf131 | 2949 | static void |
58731fd1 MM |
2950 | check_field_decls (tree t, tree *access_decls, |
2951 | int *cant_have_default_ctor_p, | |
2952 | int *cant_have_const_ctor_p, | |
2953 | int *no_const_asn_ref_p) | |
08b962b0 MM |
2954 | { |
2955 | tree *field; | |
2956 | tree *next; | |
2957 | int has_pointers; | |
2958 | int any_default_members; | |
2959 | ||
58010b57 MM |
2960 | /* First, delete any duplicate fields. */ |
2961 | delete_duplicate_fields (TYPE_FIELDS (t)); | |
2962 | ||
08b962b0 MM |
2963 | /* Assume there are no access declarations. */ |
2964 | *access_decls = NULL_TREE; | |
2965 | /* Assume this class has no pointer members. */ | |
2966 | has_pointers = 0; | |
2967 | /* Assume none of the members of this class have default | |
2968 | initializations. */ | |
2969 | any_default_members = 0; | |
2970 | ||
2971 | for (field = &TYPE_FIELDS (t); *field; field = next) | |
8d08fdba | 2972 | { |
08b962b0 MM |
2973 | tree x = *field; |
2974 | tree type = TREE_TYPE (x); | |
8d08fdba | 2975 | |
08b962b0 | 2976 | next = &TREE_CHAIN (x); |
8d08fdba | 2977 | |
c91a56d2 | 2978 | if (TREE_CODE (x) == FIELD_DECL) |
691c003d | 2979 | { |
e0d1297c NS |
2980 | if (TYPE_PACKED (t)) |
2981 | { | |
2982 | if (!pod_type_p (TREE_TYPE (x)) && !TYPE_PACKED (TREE_TYPE (x))) | |
2983 | cp_warning_at | |
2984 | ("ignoring packed attribute on unpacked non-POD field `%#D'", | |
2985 | x); | |
2986 | else | |
2987 | DECL_PACKED (x) = 1; | |
2988 | } | |
e6267549 JM |
2989 | |
2990 | if (DECL_C_BIT_FIELD (x) && integer_zerop (DECL_INITIAL (x))) | |
08b962b0 MM |
2991 | /* We don't treat zero-width bitfields as making a class |
2992 | non-empty. */ | |
2993 | ; | |
e6267549 | 2994 | else |
f9c528ea | 2995 | { |
5ec1192e MM |
2996 | tree element_type; |
2997 | ||
f9c528ea | 2998 | /* The class is non-empty. */ |
58731fd1 | 2999 | CLASSTYPE_EMPTY_P (t) = 0; |
f9c528ea MM |
3000 | /* The class is not even nearly empty. */ |
3001 | CLASSTYPE_NEARLY_EMPTY_P (t) = 0; | |
5ec1192e MM |
3002 | /* If one of the data members contains an empty class, |
3003 | so does T. */ | |
3004 | element_type = strip_array_types (type); | |
3005 | if (CLASS_TYPE_P (element_type) | |
3006 | && CLASSTYPE_CONTAINS_EMPTY_CLASS_P (element_type)) | |
aa06d37b | 3007 | CLASSTYPE_CONTAINS_EMPTY_CLASS_P (t) = 1; |
f9c528ea | 3008 | } |
691c003d | 3009 | } |
c91a56d2 | 3010 | |
cffa8729 | 3011 | if (TREE_CODE (x) == USING_DECL) |
f30432d7 | 3012 | { |
08b962b0 MM |
3013 | /* Prune the access declaration from the list of fields. */ |
3014 | *field = TREE_CHAIN (x); | |
3015 | ||
3016 | /* Save the access declarations for our caller. */ | |
3017 | *access_decls = tree_cons (NULL_TREE, x, *access_decls); | |
3018 | ||
3019 | /* Since we've reset *FIELD there's no reason to skip to the | |
3020 | next field. */ | |
3021 | next = field; | |
f30432d7 MS |
3022 | continue; |
3023 | } | |
8d08fdba | 3024 | |
050367a3 MM |
3025 | if (TREE_CODE (x) == TYPE_DECL |
3026 | || TREE_CODE (x) == TEMPLATE_DECL) | |
f30432d7 | 3027 | continue; |
8d08fdba | 3028 | |
f30432d7 | 3029 | /* If we've gotten this far, it's a data member, possibly static, |
e92cc029 | 3030 | or an enumerator. */ |
8d08fdba | 3031 | |
17aec3eb | 3032 | DECL_CONTEXT (x) = t; |
8d08fdba | 3033 | |
f30432d7 MS |
3034 | /* ``A local class cannot have static data members.'' ARM 9.4 */ |
3035 | if (current_function_decl && TREE_STATIC (x)) | |
8251199e | 3036 | cp_error_at ("field `%D' in local class cannot be static", x); |
8d08fdba | 3037 | |
f30432d7 MS |
3038 | /* Perform error checking that did not get done in |
3039 | grokdeclarator. */ | |
52fb2769 | 3040 | if (TREE_CODE (type) == FUNCTION_TYPE) |
f30432d7 | 3041 | { |
8251199e | 3042 | cp_error_at ("field `%D' invalidly declared function type", |
f30432d7 | 3043 | x); |
52fb2769 NS |
3044 | type = build_pointer_type (type); |
3045 | TREE_TYPE (x) = type; | |
f30432d7 | 3046 | } |
52fb2769 | 3047 | else if (TREE_CODE (type) == METHOD_TYPE) |
f30432d7 | 3048 | { |
8251199e | 3049 | cp_error_at ("field `%D' invalidly declared method type", x); |
52fb2769 NS |
3050 | type = build_pointer_type (type); |
3051 | TREE_TYPE (x) = type; | |
f30432d7 | 3052 | } |
8d08fdba | 3053 | |
52fb2769 | 3054 | if (type == error_mark_node) |
f30432d7 | 3055 | continue; |
8d08fdba | 3056 | |
f30432d7 MS |
3057 | /* When this goes into scope, it will be a non-local reference. */ |
3058 | DECL_NONLOCAL (x) = 1; | |
8d08fdba | 3059 | |
f30432d7 MS |
3060 | if (TREE_CODE (x) == CONST_DECL) |
3061 | continue; | |
8d08fdba | 3062 | |
f30432d7 MS |
3063 | if (TREE_CODE (x) == VAR_DECL) |
3064 | { | |
3065 | if (TREE_CODE (t) == UNION_TYPE) | |
3066 | /* Unions cannot have static members. */ | |
8251199e | 3067 | cp_error_at ("field `%D' declared static in union", x); |
8d08fdba | 3068 | |
f30432d7 MS |
3069 | continue; |
3070 | } | |
8d08fdba | 3071 | |
f30432d7 | 3072 | /* Now it can only be a FIELD_DECL. */ |
8d08fdba | 3073 | |
f30432d7 | 3074 | if (TREE_PRIVATE (x) || TREE_PROTECTED (x)) |
08b962b0 | 3075 | CLASSTYPE_NON_AGGREGATE (t) = 1; |
8d08fdba | 3076 | |
f30432d7 MS |
3077 | /* If this is of reference type, check if it needs an init. |
3078 | Also do a little ANSI jig if necessary. */ | |
52fb2769 | 3079 | if (TREE_CODE (type) == REFERENCE_TYPE) |
f30432d7 | 3080 | { |
08b962b0 | 3081 | CLASSTYPE_NON_POD_P (t) = 1; |
f30432d7 | 3082 | if (DECL_INITIAL (x) == NULL_TREE) |
6eb35968 | 3083 | SET_CLASSTYPE_REF_FIELDS_NEED_INIT (t, 1); |
8d08fdba | 3084 | |
f30432d7 MS |
3085 | /* ARM $12.6.2: [A member initializer list] (or, for an |
3086 | aggregate, initialization by a brace-enclosed list) is the | |
3087 | only way to initialize nonstatic const and reference | |
3088 | members. */ | |
08b962b0 | 3089 | *cant_have_default_ctor_p = 1; |
e349ee73 | 3090 | TYPE_HAS_COMPLEX_ASSIGN_REF (t) = 1; |
f30432d7 | 3091 | |
b930e428 MA |
3092 | if (! TYPE_HAS_CONSTRUCTOR (t) && CLASSTYPE_NON_AGGREGATE (t) |
3093 | && extra_warnings) | |
38da6039 | 3094 | cp_warning_at ("non-static reference `%#D' in class without a constructor", x); |
f30432d7 | 3095 | } |
8d08fdba | 3096 | |
1e30f9b4 | 3097 | type = strip_array_types (type); |
52fb2769 | 3098 | |
a5ac359a | 3099 | if (TYPE_PTR_P (type)) |
824b9a4c MS |
3100 | has_pointers = 1; |
3101 | ||
52fb2769 | 3102 | if (DECL_MUTABLE_P (x) || TYPE_HAS_MUTABLE_P (type)) |
08b962b0 | 3103 | CLASSTYPE_HAS_MUTABLE (t) = 1; |
a7a7710d | 3104 | |
d282fcb2 NS |
3105 | if (! pod_type_p (type)) |
3106 | /* DR 148 now allows pointers to members (which are POD themselves), | |
3107 | to be allowed in POD structs. */ | |
08b962b0 | 3108 | CLASSTYPE_NON_POD_P (t) = 1; |
52fb2769 | 3109 | |
94e6e4c4 AO |
3110 | if (! zero_init_p (type)) |
3111 | CLASSTYPE_NON_ZERO_INIT_P (t) = 1; | |
3112 | ||
f30432d7 | 3113 | /* If any field is const, the structure type is pseudo-const. */ |
52fb2769 | 3114 | if (CP_TYPE_CONST_P (type)) |
f30432d7 MS |
3115 | { |
3116 | C_TYPE_FIELDS_READONLY (t) = 1; | |
3117 | if (DECL_INITIAL (x) == NULL_TREE) | |
6eb35968 | 3118 | SET_CLASSTYPE_READONLY_FIELDS_NEED_INIT (t, 1); |
f30432d7 MS |
3119 | |
3120 | /* ARM $12.6.2: [A member initializer list] (or, for an | |
3121 | aggregate, initialization by a brace-enclosed list) is the | |
3122 | only way to initialize nonstatic const and reference | |
3123 | members. */ | |
08b962b0 | 3124 | *cant_have_default_ctor_p = 1; |
e349ee73 | 3125 | TYPE_HAS_COMPLEX_ASSIGN_REF (t) = 1; |
f30432d7 | 3126 | |
b930e428 MA |
3127 | if (! TYPE_HAS_CONSTRUCTOR (t) && CLASSTYPE_NON_AGGREGATE (t) |
3128 | && extra_warnings) | |
38da6039 | 3129 | cp_warning_at ("non-static const member `%#D' in class without a constructor", x); |
f30432d7 | 3130 | } |
08b962b0 | 3131 | /* A field that is pseudo-const makes the structure likewise. */ |
5552b43c | 3132 | else if (CLASS_TYPE_P (type)) |
f30432d7 | 3133 | { |
08b962b0 | 3134 | C_TYPE_FIELDS_READONLY (t) |= C_TYPE_FIELDS_READONLY (type); |
6eb35968 DE |
3135 | SET_CLASSTYPE_READONLY_FIELDS_NEED_INIT (t, |
3136 | CLASSTYPE_READONLY_FIELDS_NEED_INIT (t) | |
3137 | | CLASSTYPE_READONLY_FIELDS_NEED_INIT (type)); | |
f30432d7 | 3138 | } |
8d08fdba | 3139 | |
c10bffd0 JM |
3140 | /* Core issue 80: A nonstatic data member is required to have a |
3141 | different name from the class iff the class has a | |
3142 | user-defined constructor. */ | |
633221db | 3143 | if (constructor_name_p (DECL_NAME (x), t) && TYPE_HAS_CONSTRUCTOR (t)) |
d80c3489 | 3144 | cp_pedwarn_at ("field `%#D' with same name as class", x); |
c10bffd0 | 3145 | |
162bc98d JM |
3146 | /* We set DECL_C_BIT_FIELD in grokbitfield. |
3147 | If the type and width are valid, we'll also set DECL_BIT_FIELD. */ | |
3148 | if (DECL_C_BIT_FIELD (x)) | |
1e30f9b4 | 3149 | check_bitfield_decl (x); |
f30432d7 | 3150 | else |
1e30f9b4 | 3151 | check_field_decl (x, t, |
08b962b0 MM |
3152 | cant_have_const_ctor_p, |
3153 | cant_have_default_ctor_p, | |
3154 | no_const_asn_ref_p, | |
1e30f9b4 | 3155 | &any_default_members); |
8d08fdba MS |
3156 | } |
3157 | ||
824b9a4c | 3158 | /* Effective C++ rule 11. */ |
7834ab39 | 3159 | if (has_pointers && warn_ecpp && TYPE_HAS_CONSTRUCTOR (t) |
824b9a4c MS |
3160 | && ! (TYPE_HAS_INIT_REF (t) && TYPE_HAS_ASSIGN_REF (t))) |
3161 | { | |
33bd39a2 | 3162 | warning ("`%#T' has pointer data members", t); |
824b9a4c MS |
3163 | |
3164 | if (! TYPE_HAS_INIT_REF (t)) | |
3165 | { | |
33bd39a2 | 3166 | warning (" but does not override `%T(const %T&)'", t, t); |
824b9a4c | 3167 | if (! TYPE_HAS_ASSIGN_REF (t)) |
33bd39a2 | 3168 | warning (" or `operator=(const %T&)'", t); |
824b9a4c MS |
3169 | } |
3170 | else if (! TYPE_HAS_ASSIGN_REF (t)) | |
33bd39a2 | 3171 | warning (" but does not override `operator=(const %T&)'", t); |
824b9a4c | 3172 | } |
08b962b0 | 3173 | |
607cf131 MM |
3174 | |
3175 | /* Check anonymous struct/anonymous union fields. */ | |
3176 | finish_struct_anon (t); | |
3177 | ||
08b962b0 MM |
3178 | /* We've built up the list of access declarations in reverse order. |
3179 | Fix that now. */ | |
3180 | *access_decls = nreverse (*access_decls); | |
08b962b0 MM |
3181 | } |
3182 | ||
c20118a8 MM |
3183 | /* If TYPE is an empty class type, records its OFFSET in the table of |
3184 | OFFSETS. */ | |
607cf131 | 3185 | |
c20118a8 | 3186 | static int |
94edc4ab | 3187 | record_subobject_offset (tree type, tree offset, splay_tree offsets) |
5c24fba6 | 3188 | { |
c20118a8 | 3189 | splay_tree_node n; |
5c24fba6 | 3190 | |
c20118a8 MM |
3191 | if (!is_empty_class (type)) |
3192 | return 0; | |
5c24fba6 | 3193 | |
c20118a8 MM |
3194 | /* Record the location of this empty object in OFFSETS. */ |
3195 | n = splay_tree_lookup (offsets, (splay_tree_key) offset); | |
3196 | if (!n) | |
3197 | n = splay_tree_insert (offsets, | |
3198 | (splay_tree_key) offset, | |
3199 | (splay_tree_value) NULL_TREE); | |
3200 | n->value = ((splay_tree_value) | |
3201 | tree_cons (NULL_TREE, | |
3202 | type, | |
3203 | (tree) n->value)); | |
3204 | ||
3205 | return 0; | |
607cf131 MM |
3206 | } |
3207 | ||
838dfd8a | 3208 | /* Returns nonzero if TYPE is an empty class type and there is |
c20118a8 | 3209 | already an entry in OFFSETS for the same TYPE as the same OFFSET. */ |
9785e4b1 | 3210 | |
c20118a8 | 3211 | static int |
94edc4ab | 3212 | check_subobject_offset (tree type, tree offset, splay_tree offsets) |
9785e4b1 | 3213 | { |
c20118a8 MM |
3214 | splay_tree_node n; |
3215 | tree t; | |
3216 | ||
3217 | if (!is_empty_class (type)) | |
3218 | return 0; | |
3219 | ||
3220 | /* Record the location of this empty object in OFFSETS. */ | |
3221 | n = splay_tree_lookup (offsets, (splay_tree_key) offset); | |
3222 | if (!n) | |
3223 | return 0; | |
3224 | ||
3225 | for (t = (tree) n->value; t; t = TREE_CHAIN (t)) | |
3226 | if (same_type_p (TREE_VALUE (t), type)) | |
3227 | return 1; | |
3228 | ||
3229 | return 0; | |
9785e4b1 MM |
3230 | } |
3231 | ||
c20118a8 MM |
3232 | /* Walk through all the subobjects of TYPE (located at OFFSET). Call |
3233 | F for every subobject, passing it the type, offset, and table of | |
2003cd37 MM |
3234 | OFFSETS. If VBASES_P is one, then virtual non-primary bases should |
3235 | be traversed. | |
5cdba4ff MM |
3236 | |
3237 | If MAX_OFFSET is non-NULL, then subobjects with an offset greater | |
3238 | than MAX_OFFSET will not be walked. | |
3239 | ||
838dfd8a | 3240 | If F returns a nonzero value, the traversal ceases, and that value |
5cdba4ff | 3241 | is returned. Otherwise, returns zero. */ |
d77249e7 | 3242 | |
c20118a8 | 3243 | static int |
94edc4ab NN |
3244 | walk_subobject_offsets (tree type, |
3245 | subobject_offset_fn f, | |
3246 | tree offset, | |
3247 | splay_tree offsets, | |
3248 | tree max_offset, | |
3249 | int vbases_p) | |
5c24fba6 | 3250 | { |
c20118a8 | 3251 | int r = 0; |
ff944b49 | 3252 | tree type_binfo = NULL_TREE; |
c20118a8 | 3253 | |
5cdba4ff MM |
3254 | /* If this OFFSET is bigger than the MAX_OFFSET, then we should |
3255 | stop. */ | |
3256 | if (max_offset && INT_CST_LT (max_offset, offset)) | |
3257 | return 0; | |
3258 | ||
ff944b49 MM |
3259 | if (!TYPE_P (type)) |
3260 | { | |
3261 | if (abi_version_at_least (2)) | |
3262 | type_binfo = type; | |
3263 | type = BINFO_TYPE (type); | |
3264 | } | |
3265 | ||
c20118a8 | 3266 | if (CLASS_TYPE_P (type)) |
5c24fba6 | 3267 | { |
c20118a8 | 3268 | tree field; |
17bbb839 | 3269 | tree binfo; |
c20118a8 MM |
3270 | int i; |
3271 | ||
5ec1192e MM |
3272 | /* Avoid recursing into objects that are not interesting. */ |
3273 | if (!CLASSTYPE_CONTAINS_EMPTY_CLASS_P (type)) | |
3274 | return 0; | |
3275 | ||
c20118a8 MM |
3276 | /* Record the location of TYPE. */ |
3277 | r = (*f) (type, offset, offsets); | |
3278 | if (r) | |
3279 | return r; | |
3280 | ||
3281 | /* Iterate through the direct base classes of TYPE. */ | |
ff944b49 MM |
3282 | if (!type_binfo) |
3283 | type_binfo = TYPE_BINFO (type); | |
3284 | for (i = 0; i < BINFO_N_BASETYPES (type_binfo); ++i) | |
c20118a8 | 3285 | { |
ff944b49 MM |
3286 | tree binfo_offset; |
3287 | ||
3288 | binfo = BINFO_BASETYPE (type_binfo, i); | |
17bbb839 MM |
3289 | |
3290 | if (abi_version_at_least (2) | |
3291 | && TREE_VIA_VIRTUAL (binfo)) | |
3292 | continue; | |
5c24fba6 | 3293 | |
c20118a8 MM |
3294 | if (!vbases_p |
3295 | && TREE_VIA_VIRTUAL (binfo) | |
9965d119 | 3296 | && !BINFO_PRIMARY_P (binfo)) |
c20118a8 MM |
3297 | continue; |
3298 | ||
ff944b49 MM |
3299 | if (!abi_version_at_least (2)) |
3300 | binfo_offset = size_binop (PLUS_EXPR, | |
3301 | offset, | |
3302 | BINFO_OFFSET (binfo)); | |
3303 | else | |
3304 | { | |
3305 | tree orig_binfo; | |
3306 | /* We cannot rely on BINFO_OFFSET being set for the base | |
3307 | class yet, but the offsets for direct non-virtual | |
3308 | bases can be calculated by going back to the TYPE. */ | |
3309 | orig_binfo = BINFO_BASETYPE (TYPE_BINFO (type), i); | |
3310 | binfo_offset = size_binop (PLUS_EXPR, | |
3311 | offset, | |
3312 | BINFO_OFFSET (orig_binfo)); | |
3313 | } | |
3314 | ||
3315 | r = walk_subobject_offsets (binfo, | |
c20118a8 | 3316 | f, |
ff944b49 | 3317 | binfo_offset, |
c20118a8 | 3318 | offsets, |
5cdba4ff | 3319 | max_offset, |
17bbb839 MM |
3320 | (abi_version_at_least (2) |
3321 | ? /*vbases_p=*/0 : vbases_p)); | |
c20118a8 MM |
3322 | if (r) |
3323 | return r; | |
3324 | } | |
3325 | ||
ff944b49 | 3326 | if (abi_version_at_least (2)) |
17bbb839 MM |
3327 | { |
3328 | tree vbase; | |
3329 | ||
ff944b49 MM |
3330 | /* Iterate through the virtual base classes of TYPE. In G++ |
3331 | 3.2, we included virtual bases in the direct base class | |
3332 | loop above, which results in incorrect results; the | |
3333 | correct offsets for virtual bases are only known when | |
3334 | working with the most derived type. */ | |
3335 | if (vbases_p) | |
3336 | for (vbase = CLASSTYPE_VBASECLASSES (type); | |
3337 | vbase; | |
3338 | vbase = TREE_CHAIN (vbase)) | |
3339 | { | |
3340 | binfo = TREE_VALUE (vbase); | |
3341 | r = walk_subobject_offsets (binfo, | |
3342 | f, | |
3343 | size_binop (PLUS_EXPR, | |
3344 | offset, | |
3345 | BINFO_OFFSET (binfo)), | |
3346 | offsets, | |
3347 | max_offset, | |
3348 | /*vbases_p=*/0); | |
3349 | if (r) | |
3350 | return r; | |
3351 | } | |
3352 | else | |
17bbb839 | 3353 | { |
ff944b49 MM |
3354 | /* We still have to walk the primary base, if it is |
3355 | virtual. (If it is non-virtual, then it was walked | |
3356 | above.) */ | |
3357 | vbase = get_primary_binfo (type_binfo); | |
dbbf88d1 NS |
3358 | if (vbase && TREE_VIA_VIRTUAL (vbase) |
3359 | && BINFO_PRIMARY_BASE_OF (vbase) == type_binfo) | |
ff944b49 | 3360 | { |
dbbf88d1 NS |
3361 | r = (walk_subobject_offsets |
3362 | (vbase, f, offset, | |
3363 | offsets, max_offset, /*vbases_p=*/0)); | |
3364 | if (r) | |
3365 | return r; | |
ff944b49 | 3366 | } |
17bbb839 MM |
3367 | } |
3368 | } | |
3369 | ||
c20118a8 MM |
3370 | /* Iterate through the fields of TYPE. */ |
3371 | for (field = TYPE_FIELDS (type); field; field = TREE_CHAIN (field)) | |
17bbb839 | 3372 | if (TREE_CODE (field) == FIELD_DECL && !DECL_ARTIFICIAL (field)) |
c20118a8 | 3373 | { |
956d9305 MM |
3374 | tree field_offset; |
3375 | ||
3376 | if (abi_version_at_least (2)) | |
3377 | field_offset = byte_position (field); | |
3378 | else | |
3379 | /* In G++ 3.2, DECL_FIELD_OFFSET was used. */ | |
3380 | field_offset = DECL_FIELD_OFFSET (field); | |
3381 | ||
c20118a8 MM |
3382 | r = walk_subobject_offsets (TREE_TYPE (field), |
3383 | f, | |
3384 | size_binop (PLUS_EXPR, | |
3385 | offset, | |
956d9305 | 3386 | field_offset), |
c20118a8 | 3387 | offsets, |
5cdba4ff | 3388 | max_offset, |
c20118a8 MM |
3389 | /*vbases_p=*/1); |
3390 | if (r) | |
3391 | return r; | |
3392 | } | |
5c24fba6 | 3393 | } |
c20118a8 MM |
3394 | else if (TREE_CODE (type) == ARRAY_TYPE) |
3395 | { | |
5ec1192e | 3396 | tree element_type = strip_array_types (type); |
c20118a8 MM |
3397 | tree domain = TYPE_DOMAIN (type); |
3398 | tree index; | |
5c24fba6 | 3399 | |
5ec1192e MM |
3400 | /* Avoid recursing into objects that are not interesting. */ |
3401 | if (!CLASS_TYPE_P (element_type) | |
3402 | || !CLASSTYPE_CONTAINS_EMPTY_CLASS_P (element_type)) | |
3403 | return 0; | |
3404 | ||
c20118a8 | 3405 | /* Step through each of the elements in the array. */ |
17bbb839 MM |
3406 | for (index = size_zero_node; |
3407 | /* G++ 3.2 had an off-by-one error here. */ | |
3408 | (abi_version_at_least (2) | |
3409 | ? !INT_CST_LT (TYPE_MAX_VALUE (domain), index) | |
3410 | : INT_CST_LT (index, TYPE_MAX_VALUE (domain))); | |
c20118a8 MM |
3411 | index = size_binop (PLUS_EXPR, index, size_one_node)) |
3412 | { | |
3413 | r = walk_subobject_offsets (TREE_TYPE (type), | |
3414 | f, | |
3415 | offset, | |
3416 | offsets, | |
5cdba4ff | 3417 | max_offset, |
c20118a8 MM |
3418 | /*vbases_p=*/1); |
3419 | if (r) | |
3420 | return r; | |
3421 | offset = size_binop (PLUS_EXPR, offset, | |
3422 | TYPE_SIZE_UNIT (TREE_TYPE (type))); | |
5cdba4ff MM |
3423 | /* If this new OFFSET is bigger than the MAX_OFFSET, then |
3424 | there's no point in iterating through the remaining | |
3425 | elements of the array. */ | |
3426 | if (max_offset && INT_CST_LT (max_offset, offset)) | |
3427 | break; | |
c20118a8 MM |
3428 | } |
3429 | } | |
3430 | ||
3431 | return 0; | |
3432 | } | |
3433 | ||
3434 | /* Record all of the empty subobjects of TYPE (located at OFFSET) in | |
838dfd8a | 3435 | OFFSETS. If VBASES_P is nonzero, virtual bases of TYPE are |
c20118a8 MM |
3436 | examined. */ |
3437 | ||
3438 | static void | |
94edc4ab NN |
3439 | record_subobject_offsets (tree type, |
3440 | tree offset, | |
3441 | splay_tree offsets, | |
3442 | int vbases_p) | |
c20118a8 MM |
3443 | { |
3444 | walk_subobject_offsets (type, record_subobject_offset, offset, | |
5cdba4ff | 3445 | offsets, /*max_offset=*/NULL_TREE, vbases_p); |
5c24fba6 MM |
3446 | } |
3447 | ||
838dfd8a KH |
3448 | /* Returns nonzero if any of the empty subobjects of TYPE (located at |
3449 | OFFSET) conflict with entries in OFFSETS. If VBASES_P is nonzero, | |
c20118a8 | 3450 | virtual bases of TYPE are examined. */ |
9785e4b1 MM |
3451 | |
3452 | static int | |
94edc4ab NN |
3453 | layout_conflict_p (tree type, |
3454 | tree offset, | |
3455 | splay_tree offsets, | |
3456 | int vbases_p) | |
9785e4b1 | 3457 | { |
5cdba4ff MM |
3458 | splay_tree_node max_node; |
3459 | ||
3460 | /* Get the node in OFFSETS that indicates the maximum offset where | |
3461 | an empty subobject is located. */ | |
3462 | max_node = splay_tree_max (offsets); | |
3463 | /* If there aren't any empty subobjects, then there's no point in | |
3464 | performing this check. */ | |
3465 | if (!max_node) | |
3466 | return 0; | |
3467 | ||
c20118a8 | 3468 | return walk_subobject_offsets (type, check_subobject_offset, offset, |
5cdba4ff MM |
3469 | offsets, (tree) (max_node->key), |
3470 | vbases_p); | |
9785e4b1 MM |
3471 | } |
3472 | ||
5c24fba6 MM |
3473 | /* DECL is a FIELD_DECL corresponding either to a base subobject of a |
3474 | non-static data member of the type indicated by RLI. BINFO is the | |
c20118a8 | 3475 | binfo corresponding to the base subobject, OFFSETS maps offsets to |
17bbb839 MM |
3476 | types already located at those offsets. This function determines |
3477 | the position of the DECL. */ | |
5c24fba6 MM |
3478 | |
3479 | static void | |
17bbb839 MM |
3480 | layout_nonempty_base_or_field (record_layout_info rli, |
3481 | tree decl, | |
3482 | tree binfo, | |
3483 | splay_tree offsets) | |
5c24fba6 | 3484 | { |
c20118a8 | 3485 | tree offset = NULL_TREE; |
17bbb839 MM |
3486 | bool field_p; |
3487 | tree type; | |
3488 | ||
3489 | if (binfo) | |
3490 | { | |
3491 | /* For the purposes of determining layout conflicts, we want to | |
3492 | use the class type of BINFO; TREE_TYPE (DECL) will be the | |
3493 | CLASSTYPE_AS_BASE version, which does not contain entries for | |
3494 | zero-sized bases. */ | |
3495 | type = TREE_TYPE (binfo); | |
3496 | field_p = false; | |
3497 | } | |
3498 | else | |
3499 | { | |
3500 | type = TREE_TYPE (decl); | |
3501 | field_p = true; | |
3502 | } | |
c20118a8 | 3503 | |
5c24fba6 MM |
3504 | /* Try to place the field. It may take more than one try if we have |
3505 | a hard time placing the field without putting two objects of the | |
3506 | same type at the same address. */ | |
3507 | while (1) | |
3508 | { | |
defd0dea | 3509 | struct record_layout_info_s old_rli = *rli; |
5c24fba6 | 3510 | |
770ae6cc RK |
3511 | /* Place this field. */ |
3512 | place_field (rli, decl); | |
da3d4dfa | 3513 | offset = byte_position (decl); |
5c24fba6 MM |
3514 | |
3515 | /* We have to check to see whether or not there is already | |
3516 | something of the same type at the offset we're about to use. | |
3517 | For example: | |
3518 | ||
3519 | struct S {}; | |
3520 | struct T : public S { int i; }; | |
3521 | struct U : public S, public T {}; | |
3522 | ||
3523 | Here, we put S at offset zero in U. Then, we can't put T at | |
3524 | offset zero -- its S component would be at the same address | |
3525 | as the S we already allocated. So, we have to skip ahead. | |
3526 | Since all data members, including those whose type is an | |
838dfd8a | 3527 | empty class, have nonzero size, any overlap can happen only |
5c24fba6 MM |
3528 | with a direct or indirect base-class -- it can't happen with |
3529 | a data member. */ | |
7ba539c6 MM |
3530 | /* G++ 3.2 did not check for overlaps when placing a non-empty |
3531 | virtual base. */ | |
3532 | if (!abi_version_at_least (2) && binfo && TREE_VIA_VIRTUAL (binfo)) | |
3533 | break; | |
ff944b49 MM |
3534 | if (layout_conflict_p (field_p ? type : binfo, offset, |
3535 | offsets, field_p)) | |
5c24fba6 | 3536 | { |
5c24fba6 MM |
3537 | /* Strip off the size allocated to this field. That puts us |
3538 | at the first place we could have put the field with | |
3539 | proper alignment. */ | |
770ae6cc RK |
3540 | *rli = old_rli; |
3541 | ||
c20118a8 | 3542 | /* Bump up by the alignment required for the type. */ |
770ae6cc | 3543 | rli->bitpos |
c20118a8 MM |
3544 | = size_binop (PLUS_EXPR, rli->bitpos, |
3545 | bitsize_int (binfo | |
3546 | ? CLASSTYPE_ALIGN (type) | |
3547 | : TYPE_ALIGN (type))); | |
770ae6cc | 3548 | normalize_rli (rli); |
5c24fba6 MM |
3549 | } |
3550 | else | |
3551 | /* There was no conflict. We're done laying out this field. */ | |
3552 | break; | |
3553 | } | |
c20118a8 | 3554 | |
623fe76a | 3555 | /* Now that we know where it will be placed, update its |
c20118a8 MM |
3556 | BINFO_OFFSET. */ |
3557 | if (binfo && CLASS_TYPE_P (BINFO_TYPE (binfo))) | |
90024bdc | 3558 | /* Indirect virtual bases may have a nonzero BINFO_OFFSET at |
17bbb839 MM |
3559 | this point because their BINFO_OFFSET is copied from another |
3560 | hierarchy. Therefore, we may not need to add the entire | |
3561 | OFFSET. */ | |
c20118a8 | 3562 | propagate_binfo_offsets (binfo, |
17bbb839 MM |
3563 | size_diffop (convert (ssizetype, offset), |
3564 | convert (ssizetype, | |
dbbf88d1 | 3565 | BINFO_OFFSET (binfo)))); |
5c24fba6 MM |
3566 | } |
3567 | ||
90024bdc | 3568 | /* Returns true if TYPE is empty and OFFSET is nonzero. */ |
7ba539c6 MM |
3569 | |
3570 | static int | |
3571 | empty_base_at_nonzero_offset_p (tree type, | |
3572 | tree offset, | |
3573 | splay_tree offsets ATTRIBUTE_UNUSED) | |
3574 | { | |
3575 | return is_empty_class (type) && !integer_zerop (offset); | |
3576 | } | |
3577 | ||
9785e4b1 | 3578 | /* Layout the empty base BINFO. EOC indicates the byte currently just |
ec386958 | 3579 | past the end of the class, and should be correctly aligned for a |
c20118a8 | 3580 | class of the type indicated by BINFO; OFFSETS gives the offsets of |
623fe76a | 3581 | the empty bases allocated so far. T is the most derived |
838dfd8a | 3582 | type. Return nonzero iff we added it at the end. */ |
9785e4b1 | 3583 | |
06d9f09f | 3584 | static bool |
dbbf88d1 | 3585 | layout_empty_base (tree binfo, tree eoc, splay_tree offsets) |
9785e4b1 | 3586 | { |
ec386958 | 3587 | tree alignment; |
9785e4b1 | 3588 | tree basetype = BINFO_TYPE (binfo); |
06d9f09f | 3589 | bool atend = false; |
956d9305 | 3590 | |
9785e4b1 MM |
3591 | /* This routine should only be used for empty classes. */ |
3592 | my_friendly_assert (is_empty_class (basetype), 20000321); | |
1b50716d | 3593 | alignment = ssize_int (CLASSTYPE_ALIGN_UNIT (basetype)); |
9785e4b1 | 3594 | |
3075b327 NS |
3595 | if (!integer_zerop (BINFO_OFFSET (binfo))) |
3596 | { | |
3597 | if (abi_version_at_least (2)) | |
3598 | propagate_binfo_offsets | |
3599 | (binfo, size_diffop (size_zero_node, BINFO_OFFSET (binfo))); | |
3600 | else if (warn_abi) | |
3601 | warning ("offset of empty base `%T' may not be ABI-compliant and may" | |
3602 | "change in a future version of GCC", | |
3603 | BINFO_TYPE (binfo)); | |
3604 | } | |
3605 | ||
9785e4b1 MM |
3606 | /* This is an empty base class. We first try to put it at offset |
3607 | zero. */ | |
ff944b49 | 3608 | if (layout_conflict_p (binfo, |
c20118a8 MM |
3609 | BINFO_OFFSET (binfo), |
3610 | offsets, | |
3611 | /*vbases_p=*/0)) | |
9785e4b1 MM |
3612 | { |
3613 | /* That didn't work. Now, we move forward from the next | |
3614 | available spot in the class. */ | |
06d9f09f | 3615 | atend = true; |
dbbf88d1 | 3616 | propagate_binfo_offsets (binfo, convert (ssizetype, eoc)); |
9785e4b1 MM |
3617 | while (1) |
3618 | { | |
ff944b49 | 3619 | if (!layout_conflict_p (binfo, |
c20118a8 MM |
3620 | BINFO_OFFSET (binfo), |
3621 | offsets, | |
3622 | /*vbases_p=*/0)) | |
9785e4b1 MM |
3623 | /* We finally found a spot where there's no overlap. */ |
3624 | break; | |
3625 | ||
3626 | /* There's overlap here, too. Bump along to the next spot. */ | |
dbbf88d1 | 3627 | propagate_binfo_offsets (binfo, alignment); |
9785e4b1 MM |
3628 | } |
3629 | } | |
06d9f09f | 3630 | return atend; |
9785e4b1 MM |
3631 | } |
3632 | ||
17bbb839 | 3633 | /* Layout the the base given by BINFO in the class indicated by RLI. |
58731fd1 | 3634 | *BASE_ALIGN is a running maximum of the alignments of |
17bbb839 MM |
3635 | any base class. OFFSETS gives the location of empty base |
3636 | subobjects. T is the most derived type. Return nonzero if the new | |
3637 | object cannot be nearly-empty. A new FIELD_DECL is inserted at | |
3638 | *NEXT_FIELD, unless BINFO is for an empty base class. | |
5c24fba6 | 3639 | |
17bbb839 MM |
3640 | Returns the location at which the next field should be inserted. */ |
3641 | ||
3642 | static tree * | |
58731fd1 | 3643 | build_base_field (record_layout_info rli, tree binfo, |
17bbb839 | 3644 | splay_tree offsets, tree *next_field) |
d77249e7 | 3645 | { |
17bbb839 | 3646 | tree t = rli->t; |
d77249e7 | 3647 | tree basetype = BINFO_TYPE (binfo); |
d77249e7 | 3648 | |
d0f062fb | 3649 | if (!COMPLETE_TYPE_P (basetype)) |
d77249e7 MM |
3650 | /* This error is now reported in xref_tag, thus giving better |
3651 | location information. */ | |
17bbb839 | 3652 | return next_field; |
d77249e7 | 3653 | |
17bbb839 MM |
3654 | /* Place the base class. */ |
3655 | if (!is_empty_class (basetype)) | |
5c24fba6 | 3656 | { |
17bbb839 MM |
3657 | tree decl; |
3658 | ||
5c24fba6 MM |
3659 | /* The containing class is non-empty because it has a non-empty |
3660 | base class. */ | |
58731fd1 | 3661 | CLASSTYPE_EMPTY_P (t) = 0; |
17bbb839 MM |
3662 | |
3663 | /* Create the FIELD_DECL. */ | |
3664 | decl = build_decl (FIELD_DECL, NULL_TREE, CLASSTYPE_AS_BASE (basetype)); | |
3665 | DECL_ARTIFICIAL (decl) = 1; | |
3666 | DECL_FIELD_CONTEXT (decl) = t; | |
3667 | DECL_SIZE (decl) = CLASSTYPE_SIZE (basetype); | |
3668 | DECL_SIZE_UNIT (decl) = CLASSTYPE_SIZE_UNIT (basetype); | |
3669 | DECL_ALIGN (decl) = CLASSTYPE_ALIGN (basetype); | |
3670 | DECL_USER_ALIGN (decl) = CLASSTYPE_USER_ALIGN (basetype); | |
0f3a8219 MEC |
3671 | DECL_IGNORED_P (decl) = 1; |
3672 | ||
5c24fba6 MM |
3673 | /* Try to place the field. It may take more than one try if we |
3674 | have a hard time placing the field without putting two | |
3675 | objects of the same type at the same address. */ | |
17bbb839 MM |
3676 | layout_nonempty_base_or_field (rli, decl, binfo, offsets); |
3677 | /* Add the new FIELD_DECL to the list of fields for T. */ | |
3678 | TREE_CHAIN (decl) = *next_field; | |
3679 | *next_field = decl; | |
3680 | next_field = &TREE_CHAIN (decl); | |
5c24fba6 MM |
3681 | } |
3682 | else | |
ec386958 | 3683 | { |
17bbb839 | 3684 | tree eoc; |
7ba539c6 | 3685 | bool atend; |
ec386958 MM |
3686 | |
3687 | /* On some platforms (ARM), even empty classes will not be | |
3688 | byte-aligned. */ | |
17bbb839 MM |
3689 | eoc = round_up (rli_size_unit_so_far (rli), |
3690 | CLASSTYPE_ALIGN_UNIT (basetype)); | |
dbbf88d1 | 3691 | atend = layout_empty_base (binfo, eoc, offsets); |
7ba539c6 MM |
3692 | /* A nearly-empty class "has no proper base class that is empty, |
3693 | not morally virtual, and at an offset other than zero." */ | |
3694 | if (!TREE_VIA_VIRTUAL (binfo) && CLASSTYPE_NEARLY_EMPTY_P (t)) | |
3695 | { | |
3696 | if (atend) | |
3697 | CLASSTYPE_NEARLY_EMPTY_P (t) = 0; | |
3698 | /* The check above (used in G++ 3.2) is insufficient because | |
3699 | an empty class placed at offset zero might itself have an | |
90024bdc | 3700 | empty base at a nonzero offset. */ |
7ba539c6 MM |
3701 | else if (walk_subobject_offsets (basetype, |
3702 | empty_base_at_nonzero_offset_p, | |
3703 | size_zero_node, | |
3704 | /*offsets=*/NULL, | |
3705 | /*max_offset=*/NULL_TREE, | |
3706 | /*vbases_p=*/true)) | |
3707 | { | |
3708 | if (abi_version_at_least (2)) | |
3709 | CLASSTYPE_NEARLY_EMPTY_P (t) = 0; | |
3710 | else if (warn_abi) | |
3711 | warning ("class `%T' will be considered nearly empty in a " | |
3712 | "future version of GCC", t); | |
3713 | } | |
3714 | } | |
3715 | ||
17bbb839 MM |
3716 | /* We do not create a FIELD_DECL for empty base classes because |
3717 | it might overlap some other field. We want to be able to | |
3718 | create CONSTRUCTORs for the class by iterating over the | |
3719 | FIELD_DECLs, and the back end does not handle overlapping | |
3720 | FIELD_DECLs. */ | |
58731fd1 MM |
3721 | |
3722 | /* An empty virtual base causes a class to be non-empty | |
3723 | -- but in that case we do not need to clear CLASSTYPE_EMPTY_P | |
3724 | here because that was already done when the virtual table | |
3725 | pointer was created. */ | |
ec386958 | 3726 | } |
5c24fba6 | 3727 | |
5c24fba6 | 3728 | /* Record the offsets of BINFO and its base subobjects. */ |
ff944b49 | 3729 | record_subobject_offsets (binfo, |
c20118a8 MM |
3730 | BINFO_OFFSET (binfo), |
3731 | offsets, | |
3732 | /*vbases_p=*/0); | |
17bbb839 MM |
3733 | |
3734 | return next_field; | |
d77249e7 MM |
3735 | } |
3736 | ||
c20118a8 | 3737 | /* Layout all of the non-virtual base classes. Record empty |
17bbb839 MM |
3738 | subobjects in OFFSETS. T is the most derived type. Return nonzero |
3739 | if the type cannot be nearly empty. The fields created | |
3740 | corresponding to the base classes will be inserted at | |
3741 | *NEXT_FIELD. */ | |
607cf131 | 3742 | |
17bbb839 | 3743 | static void |
58731fd1 | 3744 | build_base_fields (record_layout_info rli, |
17bbb839 | 3745 | splay_tree offsets, tree *next_field) |
607cf131 MM |
3746 | { |
3747 | /* Chain to hold all the new FIELD_DECLs which stand in for base class | |
3748 | subobjects. */ | |
17bbb839 MM |
3749 | tree t = rli->t; |
3750 | int n_baseclasses = CLASSTYPE_N_BASECLASSES (t); | |
5c24fba6 | 3751 | int i; |
607cf131 | 3752 | |
3461fba7 | 3753 | /* The primary base class is always allocated first. */ |
17bbb839 MM |
3754 | if (CLASSTYPE_HAS_PRIMARY_BASE_P (t)) |
3755 | next_field = build_base_field (rli, CLASSTYPE_PRIMARY_BINFO (t), | |
58731fd1 | 3756 | offsets, next_field); |
d77249e7 MM |
3757 | |
3758 | /* Now allocate the rest of the bases. */ | |
607cf131 MM |
3759 | for (i = 0; i < n_baseclasses; ++i) |
3760 | { | |
d77249e7 | 3761 | tree base_binfo; |
607cf131 | 3762 | |
17bbb839 | 3763 | base_binfo = BINFO_BASETYPE (TYPE_BINFO (t), i); |
911a71a7 | 3764 | |
3461fba7 NS |
3765 | /* The primary base was already allocated above, so we don't |
3766 | need to allocate it again here. */ | |
17bbb839 | 3767 | if (base_binfo == CLASSTYPE_PRIMARY_BINFO (t)) |
607cf131 MM |
3768 | continue; |
3769 | ||
dbbf88d1 NS |
3770 | /* Virtual bases are added at the end (a primary virtual base |
3771 | will have already been added). */ | |
3772 | if (TREE_VIA_VIRTUAL (base_binfo)) | |
607cf131 MM |
3773 | continue; |
3774 | ||
58731fd1 | 3775 | next_field = build_base_field (rli, base_binfo, |
17bbb839 | 3776 | offsets, next_field); |
607cf131 | 3777 | } |
607cf131 MM |
3778 | } |
3779 | ||
58010b57 MM |
3780 | /* Go through the TYPE_METHODS of T issuing any appropriate |
3781 | diagnostics, figuring out which methods override which other | |
3ef397c1 | 3782 | methods, and so forth. */ |
58010b57 MM |
3783 | |
3784 | static void | |
94edc4ab | 3785 | check_methods (tree t) |
58010b57 MM |
3786 | { |
3787 | tree x; | |
58010b57 MM |
3788 | |
3789 | for (x = TYPE_METHODS (t); x; x = TREE_CHAIN (x)) | |
3790 | { | |
58010b57 | 3791 | /* If this was an evil function, don't keep it in class. */ |
92643fea MM |
3792 | if (DECL_ASSEMBLER_NAME_SET_P (x) |
3793 | && IDENTIFIER_ERROR_LOCUS (DECL_ASSEMBLER_NAME (x))) | |
58010b57 MM |
3794 | continue; |
3795 | ||
58010b57 | 3796 | check_for_override (x, t); |
fee7654e | 3797 | if (DECL_PURE_VIRTUAL_P (x) && ! DECL_VINDEX (x)) |
58010b57 MM |
3798 | cp_error_at ("initializer specified for non-virtual method `%D'", x); |
3799 | ||
3800 | /* The name of the field is the original field name | |
3801 | Save this in auxiliary field for later overloading. */ | |
3802 | if (DECL_VINDEX (x)) | |
3803 | { | |
3ef397c1 | 3804 | TYPE_POLYMORPHIC_P (t) = 1; |
fee7654e MM |
3805 | if (DECL_PURE_VIRTUAL_P (x)) |
3806 | CLASSTYPE_PURE_VIRTUALS (t) | |
3807 | = tree_cons (NULL_TREE, x, CLASSTYPE_PURE_VIRTUALS (t)); | |
58010b57 MM |
3808 | } |
3809 | } | |
58010b57 MM |
3810 | } |
3811 | ||
db9b2174 MM |
3812 | /* FN is a constructor or destructor. Clone the declaration to create |
3813 | a specialized in-charge or not-in-charge version, as indicated by | |
3814 | NAME. */ | |
3815 | ||
3816 | static tree | |
94edc4ab | 3817 | build_clone (tree fn, tree name) |
db9b2174 MM |
3818 | { |
3819 | tree parms; | |
3820 | tree clone; | |
3821 | ||
3822 | /* Copy the function. */ | |
3823 | clone = copy_decl (fn); | |
3824 | /* Remember where this function came from. */ | |
3825 | DECL_CLONED_FUNCTION (clone) = fn; | |
5daf7c0a | 3826 | DECL_ABSTRACT_ORIGIN (clone) = fn; |
db9b2174 MM |
3827 | /* Reset the function name. */ |
3828 | DECL_NAME (clone) = name; | |
71cb9286 | 3829 | SET_DECL_ASSEMBLER_NAME (clone, NULL_TREE); |
db9b2174 MM |
3830 | /* There's no pending inline data for this function. */ |
3831 | DECL_PENDING_INLINE_INFO (clone) = NULL; | |
3832 | DECL_PENDING_INLINE_P (clone) = 0; | |
3833 | /* And it hasn't yet been deferred. */ | |
3834 | DECL_DEFERRED_FN (clone) = 0; | |
3835 | ||
298d6f60 MM |
3836 | /* The base-class destructor is not virtual. */ |
3837 | if (name == base_dtor_identifier) | |
3838 | { | |
3839 | DECL_VIRTUAL_P (clone) = 0; | |
3840 | if (TREE_CODE (clone) != TEMPLATE_DECL) | |
3841 | DECL_VINDEX (clone) = NULL_TREE; | |
3842 | } | |
3843 | ||
4e7512c9 | 3844 | /* If there was an in-charge parameter, drop it from the function |
db9b2174 MM |
3845 | type. */ |
3846 | if (DECL_HAS_IN_CHARGE_PARM_P (clone)) | |
3847 | { | |
3848 | tree basetype; | |
3849 | tree parmtypes; | |
3850 | tree exceptions; | |
3851 | ||
3852 | exceptions = TYPE_RAISES_EXCEPTIONS (TREE_TYPE (clone)); | |
3853 | basetype = TYPE_METHOD_BASETYPE (TREE_TYPE (clone)); | |
3854 | parmtypes = TYPE_ARG_TYPES (TREE_TYPE (clone)); | |
3855 | /* Skip the `this' parameter. */ | |
3856 | parmtypes = TREE_CHAIN (parmtypes); | |
3857 | /* Skip the in-charge parameter. */ | |
3858 | parmtypes = TREE_CHAIN (parmtypes); | |
e0fff4b3 JM |
3859 | /* And the VTT parm, in a complete [cd]tor. */ |
3860 | if (DECL_HAS_VTT_PARM_P (fn) | |
3861 | && ! DECL_NEEDS_VTT_PARM_P (clone)) | |
3862 | parmtypes = TREE_CHAIN (parmtypes); | |
3ec6bad3 MM |
3863 | /* If this is subobject constructor or destructor, add the vtt |
3864 | parameter. */ | |
db9b2174 | 3865 | TREE_TYPE (clone) |
43dc123f MM |
3866 | = build_method_type_directly (basetype, |
3867 | TREE_TYPE (TREE_TYPE (clone)), | |
3868 | parmtypes); | |
db9b2174 MM |
3869 | if (exceptions) |
3870 | TREE_TYPE (clone) = build_exception_variant (TREE_TYPE (clone), | |
3871 | exceptions); | |
3872 | } | |
3873 | ||
e0fff4b3 JM |
3874 | /* Copy the function parameters. But, DECL_ARGUMENTS on a TEMPLATE_DECL |
3875 | aren't function parameters; those are the template parameters. */ | |
db9b2174 MM |
3876 | if (TREE_CODE (clone) != TEMPLATE_DECL) |
3877 | { | |
3878 | DECL_ARGUMENTS (clone) = copy_list (DECL_ARGUMENTS (clone)); | |
3879 | /* Remove the in-charge parameter. */ | |
3880 | if (DECL_HAS_IN_CHARGE_PARM_P (clone)) | |
3881 | { | |
3882 | TREE_CHAIN (DECL_ARGUMENTS (clone)) | |
3883 | = TREE_CHAIN (TREE_CHAIN (DECL_ARGUMENTS (clone))); | |
3884 | DECL_HAS_IN_CHARGE_PARM_P (clone) = 0; | |
3885 | } | |
e0fff4b3 JM |
3886 | /* And the VTT parm, in a complete [cd]tor. */ |
3887 | if (DECL_HAS_VTT_PARM_P (fn)) | |
3ec6bad3 | 3888 | { |
e0fff4b3 JM |
3889 | if (DECL_NEEDS_VTT_PARM_P (clone)) |
3890 | DECL_HAS_VTT_PARM_P (clone) = 1; | |
3891 | else | |
3892 | { | |
3893 | TREE_CHAIN (DECL_ARGUMENTS (clone)) | |
3894 | = TREE_CHAIN (TREE_CHAIN (DECL_ARGUMENTS (clone))); | |
3895 | DECL_HAS_VTT_PARM_P (clone) = 0; | |
3896 | } | |
3ec6bad3 MM |
3897 | } |
3898 | ||
db9b2174 MM |
3899 | for (parms = DECL_ARGUMENTS (clone); parms; parms = TREE_CHAIN (parms)) |
3900 | { | |
3901 | DECL_CONTEXT (parms) = clone; | |
63e1b1c4 | 3902 | cxx_dup_lang_specific_decl (parms); |
db9b2174 MM |
3903 | } |
3904 | } | |
3905 | ||
db9b2174 | 3906 | /* Create the RTL for this function. */ |
19e7881c | 3907 | SET_DECL_RTL (clone, NULL_RTX); |
db9b2174 MM |
3908 | rest_of_decl_compilation (clone, NULL, /*top_level=*/1, at_eof); |
3909 | ||
3910 | /* Make it easy to find the CLONE given the FN. */ | |
3911 | TREE_CHAIN (clone) = TREE_CHAIN (fn); | |
3912 | TREE_CHAIN (fn) = clone; | |
3913 | ||
3914 | /* If this is a template, handle the DECL_TEMPLATE_RESULT as well. */ | |
3915 | if (TREE_CODE (clone) == TEMPLATE_DECL) | |
3916 | { | |
3917 | tree result; | |
3918 | ||
3919 | DECL_TEMPLATE_RESULT (clone) | |
3920 | = build_clone (DECL_TEMPLATE_RESULT (clone), name); | |
3921 | result = DECL_TEMPLATE_RESULT (clone); | |
3922 | DECL_TEMPLATE_INFO (result) = copy_node (DECL_TEMPLATE_INFO (result)); | |
3923 | DECL_TI_TEMPLATE (result) = clone; | |
3924 | } | |
298d6f60 MM |
3925 | else if (DECL_DEFERRED_FN (fn)) |
3926 | defer_fn (clone); | |
db9b2174 MM |
3927 | |
3928 | return clone; | |
3929 | } | |
3930 | ||
3931 | /* Produce declarations for all appropriate clones of FN. If | |
838dfd8a | 3932 | UPDATE_METHOD_VEC_P is nonzero, the clones are added to the |
db9b2174 MM |
3933 | CLASTYPE_METHOD_VEC as well. */ |
3934 | ||
3935 | void | |
94edc4ab | 3936 | clone_function_decl (tree fn, int update_method_vec_p) |
db9b2174 MM |
3937 | { |
3938 | tree clone; | |
3939 | ||
c00996a3 | 3940 | /* Avoid inappropriate cloning. */ |
1f84ec23 MM |
3941 | if (TREE_CHAIN (fn) |
3942 | && DECL_CLONED_FUNCTION (TREE_CHAIN (fn))) | |
c00996a3 JM |
3943 | return; |
3944 | ||
298d6f60 | 3945 | if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (fn)) |
db9b2174 | 3946 | { |
298d6f60 MM |
3947 | /* For each constructor, we need two variants: an in-charge version |
3948 | and a not-in-charge version. */ | |
db9b2174 MM |
3949 | clone = build_clone (fn, complete_ctor_identifier); |
3950 | if (update_method_vec_p) | |
452a394b | 3951 | add_method (DECL_CONTEXT (clone), clone, /*error_p=*/0); |
db9b2174 MM |
3952 | clone = build_clone (fn, base_ctor_identifier); |
3953 | if (update_method_vec_p) | |
452a394b | 3954 | add_method (DECL_CONTEXT (clone), clone, /*error_p=*/0); |
db9b2174 MM |
3955 | } |
3956 | else | |
298d6f60 MM |
3957 | { |
3958 | my_friendly_assert (DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P (fn), 20000411); | |
3959 | ||
3ec6bad3 | 3960 | /* For each destructor, we need three variants: an in-charge |
298d6f60 | 3961 | version, a not-in-charge version, and an in-charge deleting |
4e7512c9 MM |
3962 | version. We clone the deleting version first because that |
3963 | means it will go second on the TYPE_METHODS list -- and that | |
3964 | corresponds to the correct layout order in the virtual | |
52682a1b MM |
3965 | function table. |
3966 | ||
3967 | For a non-virtual destructor, we do not build a deleting | |
3968 | destructor. */ | |
3969 | if (DECL_VIRTUAL_P (fn)) | |
3970 | { | |
3971 | clone = build_clone (fn, deleting_dtor_identifier); | |
3972 | if (update_method_vec_p) | |
3973 | add_method (DECL_CONTEXT (clone), clone, /*error_p=*/0); | |
3974 | } | |
4e7512c9 | 3975 | clone = build_clone (fn, complete_dtor_identifier); |
298d6f60 | 3976 | if (update_method_vec_p) |
452a394b | 3977 | add_method (DECL_CONTEXT (clone), clone, /*error_p=*/0); |
298d6f60 MM |
3978 | clone = build_clone (fn, base_dtor_identifier); |
3979 | if (update_method_vec_p) | |
452a394b | 3980 | add_method (DECL_CONTEXT (clone), clone, /*error_p=*/0); |
298d6f60 | 3981 | } |
5daf7c0a JM |
3982 | |
3983 | /* Note that this is an abstract function that is never emitted. */ | |
3984 | DECL_ABSTRACT (fn) = 1; | |
db9b2174 MM |
3985 | } |
3986 | ||
5f6eeeb3 NS |
3987 | /* DECL is an in charge constructor, which is being defined. This will |
3988 | have had an in class declaration, from whence clones were | |
3989 | declared. An out-of-class definition can specify additional default | |
3990 | arguments. As it is the clones that are involved in overload | |
3991 | resolution, we must propagate the information from the DECL to its | |
00a17e31 | 3992 | clones. */ |
5f6eeeb3 NS |
3993 | |
3994 | void | |
94edc4ab | 3995 | adjust_clone_args (tree decl) |
5f6eeeb3 NS |
3996 | { |
3997 | tree clone; | |
3998 | ||
3999 | for (clone = TREE_CHAIN (decl); clone && DECL_CLONED_FUNCTION (clone); | |
4000 | clone = TREE_CHAIN (clone)) | |
4001 | { | |
4002 | tree orig_clone_parms = TYPE_ARG_TYPES (TREE_TYPE (clone)); | |
4003 | tree orig_decl_parms = TYPE_ARG_TYPES (TREE_TYPE (decl)); | |
4004 | tree decl_parms, clone_parms; | |
4005 | ||
4006 | clone_parms = orig_clone_parms; | |
4007 | ||
00a17e31 | 4008 | /* Skip the 'this' parameter. */ |
5f6eeeb3 NS |
4009 | orig_clone_parms = TREE_CHAIN (orig_clone_parms); |
4010 | orig_decl_parms = TREE_CHAIN (orig_decl_parms); | |
4011 | ||
4012 | if (DECL_HAS_IN_CHARGE_PARM_P (decl)) | |
4013 | orig_decl_parms = TREE_CHAIN (orig_decl_parms); | |
4014 | if (DECL_HAS_VTT_PARM_P (decl)) | |
4015 | orig_decl_parms = TREE_CHAIN (orig_decl_parms); | |
4016 | ||
4017 | clone_parms = orig_clone_parms; | |
4018 | if (DECL_HAS_VTT_PARM_P (clone)) | |
4019 | clone_parms = TREE_CHAIN (clone_parms); | |
4020 | ||
4021 | for (decl_parms = orig_decl_parms; decl_parms; | |
4022 | decl_parms = TREE_CHAIN (decl_parms), | |
4023 | clone_parms = TREE_CHAIN (clone_parms)) | |
4024 | { | |
4025 | my_friendly_assert (same_type_p (TREE_TYPE (decl_parms), | |
4026 | TREE_TYPE (clone_parms)), 20010424); | |
4027 | ||
4028 | if (TREE_PURPOSE (decl_parms) && !TREE_PURPOSE (clone_parms)) | |
4029 | { | |
4030 | /* A default parameter has been added. Adjust the | |
00a17e31 | 4031 | clone's parameters. */ |
5f6eeeb3 NS |
4032 | tree exceptions = TYPE_RAISES_EXCEPTIONS (TREE_TYPE (clone)); |
4033 | tree basetype = TYPE_METHOD_BASETYPE (TREE_TYPE (clone)); | |
4034 | tree type; | |
4035 | ||
4036 | clone_parms = orig_decl_parms; | |
4037 | ||
4038 | if (DECL_HAS_VTT_PARM_P (clone)) | |
4039 | { | |
4040 | clone_parms = tree_cons (TREE_PURPOSE (orig_clone_parms), | |
4041 | TREE_VALUE (orig_clone_parms), | |
4042 | clone_parms); | |
4043 | TREE_TYPE (clone_parms) = TREE_TYPE (orig_clone_parms); | |
4044 | } | |
43dc123f MM |
4045 | type = build_method_type_directly (basetype, |
4046 | TREE_TYPE (TREE_TYPE (clone)), | |
4047 | clone_parms); | |
5f6eeeb3 NS |
4048 | if (exceptions) |
4049 | type = build_exception_variant (type, exceptions); | |
4050 | TREE_TYPE (clone) = type; | |
4051 | ||
4052 | clone_parms = NULL_TREE; | |
4053 | break; | |
4054 | } | |
4055 | } | |
4056 | my_friendly_assert (!clone_parms, 20010424); | |
4057 | } | |
4058 | } | |
4059 | ||
db9b2174 MM |
4060 | /* For each of the constructors and destructors in T, create an |
4061 | in-charge and not-in-charge variant. */ | |
4062 | ||
4063 | static void | |
94edc4ab | 4064 | clone_constructors_and_destructors (tree t) |
db9b2174 MM |
4065 | { |
4066 | tree fns; | |
4067 | ||
db9b2174 MM |
4068 | /* If for some reason we don't have a CLASSTYPE_METHOD_VEC, we bail |
4069 | out now. */ | |
4070 | if (!CLASSTYPE_METHOD_VEC (t)) | |
4071 | return; | |
4072 | ||
db9b2174 MM |
4073 | for (fns = CLASSTYPE_CONSTRUCTORS (t); fns; fns = OVL_NEXT (fns)) |
4074 | clone_function_decl (OVL_CURRENT (fns), /*update_method_vec_p=*/1); | |
298d6f60 MM |
4075 | for (fns = CLASSTYPE_DESTRUCTORS (t); fns; fns = OVL_NEXT (fns)) |
4076 | clone_function_decl (OVL_CURRENT (fns), /*update_method_vec_p=*/1); | |
db9b2174 MM |
4077 | } |
4078 | ||
58010b57 MM |
4079 | /* Remove all zero-width bit-fields from T. */ |
4080 | ||
4081 | static void | |
94edc4ab | 4082 | remove_zero_width_bit_fields (tree t) |
58010b57 MM |
4083 | { |
4084 | tree *fieldsp; | |
4085 | ||
4086 | fieldsp = &TYPE_FIELDS (t); | |
4087 | while (*fieldsp) | |
4088 | { | |
4089 | if (TREE_CODE (*fieldsp) == FIELD_DECL | |
4090 | && DECL_C_BIT_FIELD (*fieldsp) | |
4091 | && DECL_INITIAL (*fieldsp)) | |
4092 | *fieldsp = TREE_CHAIN (*fieldsp); | |
4093 | else | |
4094 | fieldsp = &TREE_CHAIN (*fieldsp); | |
4095 | } | |
4096 | } | |
4097 | ||
dbc957f1 MM |
4098 | /* Returns TRUE iff we need a cookie when dynamically allocating an |
4099 | array whose elements have the indicated class TYPE. */ | |
4100 | ||
4101 | static bool | |
94edc4ab | 4102 | type_requires_array_cookie (tree type) |
dbc957f1 MM |
4103 | { |
4104 | tree fns; | |
18fee3ee | 4105 | bool has_two_argument_delete_p = false; |
dbc957f1 MM |
4106 | |
4107 | my_friendly_assert (CLASS_TYPE_P (type), 20010712); | |
4108 | ||
4109 | /* If there's a non-trivial destructor, we need a cookie. In order | |
4110 | to iterate through the array calling the destructor for each | |
4111 | element, we'll have to know how many elements there are. */ | |
4112 | if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type)) | |
4113 | return true; | |
4114 | ||
4115 | /* If the usual deallocation function is a two-argument whose second | |
4116 | argument is of type `size_t', then we have to pass the size of | |
4117 | the array to the deallocation function, so we will need to store | |
4118 | a cookie. */ | |
4119 | fns = lookup_fnfields (TYPE_BINFO (type), | |
4120 | ansi_opname (VEC_DELETE_EXPR), | |
4121 | /*protect=*/0); | |
4122 | /* If there are no `operator []' members, or the lookup is | |
4123 | ambiguous, then we don't need a cookie. */ | |
4124 | if (!fns || fns == error_mark_node) | |
4125 | return false; | |
4126 | /* Loop through all of the functions. */ | |
50ad9642 | 4127 | for (fns = BASELINK_FUNCTIONS (fns); fns; fns = OVL_NEXT (fns)) |
dbc957f1 MM |
4128 | { |
4129 | tree fn; | |
4130 | tree second_parm; | |
4131 | ||
4132 | /* Select the current function. */ | |
4133 | fn = OVL_CURRENT (fns); | |
4134 | /* See if this function is a one-argument delete function. If | |
4135 | it is, then it will be the usual deallocation function. */ | |
4136 | second_parm = TREE_CHAIN (TYPE_ARG_TYPES (TREE_TYPE (fn))); | |
4137 | if (second_parm == void_list_node) | |
4138 | return false; | |
4139 | /* Otherwise, if we have a two-argument function and the second | |
4140 | argument is `size_t', it will be the usual deallocation | |
4141 | function -- unless there is one-argument function, too. */ | |
4142 | if (TREE_CHAIN (second_parm) == void_list_node | |
4143 | && same_type_p (TREE_VALUE (second_parm), sizetype)) | |
4144 | has_two_argument_delete_p = true; | |
4145 | } | |
4146 | ||
4147 | return has_two_argument_delete_p; | |
4148 | } | |
4149 | ||
607cf131 MM |
4150 | /* Check the validity of the bases and members declared in T. Add any |
4151 | implicitly-generated functions (like copy-constructors and | |
4152 | assignment operators). Compute various flag bits (like | |
4153 | CLASSTYPE_NON_POD_T) for T. This routine works purely at the C++ | |
4154 | level: i.e., independently of the ABI in use. */ | |
4155 | ||
4156 | static void | |
58731fd1 | 4157 | check_bases_and_members (tree t) |
607cf131 MM |
4158 | { |
4159 | /* Nonzero if we are not allowed to generate a default constructor | |
4160 | for this case. */ | |
4161 | int cant_have_default_ctor; | |
4162 | /* Nonzero if the implicitly generated copy constructor should take | |
4163 | a non-const reference argument. */ | |
4164 | int cant_have_const_ctor; | |
4165 | /* Nonzero if the the implicitly generated assignment operator | |
4166 | should take a non-const reference argument. */ | |
4167 | int no_const_asn_ref; | |
4168 | tree access_decls; | |
4169 | ||
4170 | /* By default, we use const reference arguments and generate default | |
4171 | constructors. */ | |
4172 | cant_have_default_ctor = 0; | |
4173 | cant_have_const_ctor = 0; | |
4174 | no_const_asn_ref = 0; | |
4175 | ||
00a17e31 | 4176 | /* Check all the base-classes. */ |
607cf131 MM |
4177 | check_bases (t, &cant_have_default_ctor, &cant_have_const_ctor, |
4178 | &no_const_asn_ref); | |
4179 | ||
4180 | /* Check all the data member declarations. */ | |
58731fd1 | 4181 | check_field_decls (t, &access_decls, |
607cf131 MM |
4182 | &cant_have_default_ctor, |
4183 | &cant_have_const_ctor, | |
4184 | &no_const_asn_ref); | |
4185 | ||
4186 | /* Check all the method declarations. */ | |
4187 | check_methods (t); | |
4188 | ||
bbd15aac MM |
4189 | /* A nearly-empty class has to be vptr-containing; a nearly empty |
4190 | class contains just a vptr. */ | |
4191 | if (!TYPE_CONTAINS_VPTR_P (t)) | |
f9c528ea MM |
4192 | CLASSTYPE_NEARLY_EMPTY_P (t) = 0; |
4193 | ||
607cf131 MM |
4194 | /* Do some bookkeeping that will guide the generation of implicitly |
4195 | declared member functions. */ | |
4196 | TYPE_HAS_COMPLEX_INIT_REF (t) | |
3ef397c1 MM |
4197 | |= (TYPE_HAS_INIT_REF (t) |
4198 | || TYPE_USES_VIRTUAL_BASECLASSES (t) | |
4199 | || TYPE_POLYMORPHIC_P (t)); | |
607cf131 | 4200 | TYPE_NEEDS_CONSTRUCTING (t) |
3ef397c1 MM |
4201 | |= (TYPE_HAS_CONSTRUCTOR (t) |
4202 | || TYPE_USES_VIRTUAL_BASECLASSES (t) | |
4203 | || TYPE_POLYMORPHIC_P (t)); | |
4204 | CLASSTYPE_NON_AGGREGATE (t) |= (TYPE_HAS_CONSTRUCTOR (t) | |
4205 | || TYPE_POLYMORPHIC_P (t)); | |
607cf131 MM |
4206 | CLASSTYPE_NON_POD_P (t) |
4207 | |= (CLASSTYPE_NON_AGGREGATE (t) || TYPE_HAS_DESTRUCTOR (t) | |
4208 | || TYPE_HAS_ASSIGN_REF (t)); | |
4209 | TYPE_HAS_REAL_ASSIGN_REF (t) |= TYPE_HAS_ASSIGN_REF (t); | |
4210 | TYPE_HAS_COMPLEX_ASSIGN_REF (t) | |
0830ae44 | 4211 | |= TYPE_HAS_ASSIGN_REF (t) || TYPE_CONTAINS_VPTR_P (t); |
607cf131 MM |
4212 | |
4213 | /* Synthesize any needed methods. Note that methods will be synthesized | |
4214 | for anonymous unions; grok_x_components undoes that. */ | |
4215 | add_implicitly_declared_members (t, cant_have_default_ctor, | |
4216 | cant_have_const_ctor, | |
4217 | no_const_asn_ref); | |
4218 | ||
db9b2174 MM |
4219 | /* Create the in-charge and not-in-charge variants of constructors |
4220 | and destructors. */ | |
4221 | clone_constructors_and_destructors (t); | |
4222 | ||
aa52c1ff JM |
4223 | /* Process the using-declarations. */ |
4224 | for (; access_decls; access_decls = TREE_CHAIN (access_decls)) | |
4225 | handle_using_decl (TREE_VALUE (access_decls), t); | |
4226 | ||
607cf131 MM |
4227 | /* Build and sort the CLASSTYPE_METHOD_VEC. */ |
4228 | finish_struct_methods (t); | |
dbc957f1 MM |
4229 | |
4230 | /* Figure out whether or not we will need a cookie when dynamically | |
4231 | allocating an array of this type. */ | |
e2500fed | 4232 | TYPE_LANG_SPECIFIC (t)->u.c.vec_new_uses_cookie |
dbc957f1 | 4233 | = type_requires_array_cookie (t); |
607cf131 MM |
4234 | } |
4235 | ||
3ef397c1 | 4236 | /* If T needs a pointer to its virtual function table, set TYPE_VFIELD |
5c24fba6 MM |
4237 | accordingly. If a new vfield was created (because T doesn't have a |
4238 | primary base class), then the newly created field is returned. It | |
c35cce41 | 4239 | is not added to the TYPE_FIELDS list; it is the caller's |
e6858a84 NS |
4240 | responsibility to do that. Accumulate declared virtual functions |
4241 | on VIRTUALS_P. */ | |
3ef397c1 | 4242 | |
5c24fba6 | 4243 | static tree |
94edc4ab | 4244 | create_vtable_ptr (tree t, tree* virtuals_p) |
3ef397c1 MM |
4245 | { |
4246 | tree fn; | |
4247 | ||
e6858a84 | 4248 | /* Collect the virtual functions declared in T. */ |
3ef397c1 | 4249 | for (fn = TYPE_METHODS (t); fn; fn = TREE_CHAIN (fn)) |
e6858a84 NS |
4250 | if (DECL_VINDEX (fn) && !DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P (fn) |
4251 | && TREE_CODE (DECL_VINDEX (fn)) != INTEGER_CST) | |
4252 | { | |
4253 | tree new_virtual = make_node (TREE_LIST); | |
4254 | ||
4255 | BV_FN (new_virtual) = fn; | |
4256 | BV_DELTA (new_virtual) = integer_zero_node; | |
3ef397c1 | 4257 | |
e6858a84 NS |
4258 | TREE_CHAIN (new_virtual) = *virtuals_p; |
4259 | *virtuals_p = new_virtual; | |
4260 | } | |
4261 | ||
da3d4dfa MM |
4262 | /* If we couldn't find an appropriate base class, create a new field |
4263 | here. Even if there weren't any new virtual functions, we might need a | |
bbd15aac MM |
4264 | new virtual function table if we're supposed to include vptrs in |
4265 | all classes that need them. */ | |
e6858a84 | 4266 | if (!TYPE_VFIELD (t) && (*virtuals_p || TYPE_CONTAINS_VPTR_P (t))) |
3ef397c1 MM |
4267 | { |
4268 | /* We build this decl with vtbl_ptr_type_node, which is a | |
4269 | `vtable_entry_type*'. It might seem more precise to use | |
4270 | `vtable_entry_type (*)[N]' where N is the number of firtual | |
4271 | functions. However, that would require the vtable pointer in | |
4272 | base classes to have a different type than the vtable pointer | |
4273 | in derived classes. We could make that happen, but that | |
4274 | still wouldn't solve all the problems. In particular, the | |
4275 | type-based alias analysis code would decide that assignments | |
4276 | to the base class vtable pointer can't alias assignments to | |
4277 | the derived class vtable pointer, since they have different | |
4639c5c6 | 4278 | types. Thus, in a derived class destructor, where the base |
3ef397c1 MM |
4279 | class constructor was inlined, we could generate bad code for |
4280 | setting up the vtable pointer. | |
4281 | ||
4282 | Therefore, we use one type for all vtable pointers. We still | |
4283 | use a type-correct type; it's just doesn't indicate the array | |
4284 | bounds. That's better than using `void*' or some such; it's | |
4285 | cleaner, and it let's the alias analysis code know that these | |
4286 | stores cannot alias stores to void*! */ | |
0abe00c5 NS |
4287 | tree field; |
4288 | ||
4289 | field = build_decl (FIELD_DECL, get_vfield_name (t), vtbl_ptr_type_node); | |
4290 | SET_DECL_ASSEMBLER_NAME (field, get_identifier (VFIELD_BASE)); | |
4291 | DECL_VIRTUAL_P (field) = 1; | |
4292 | DECL_ARTIFICIAL (field) = 1; | |
4293 | DECL_FIELD_CONTEXT (field) = t; | |
4294 | DECL_FCONTEXT (field) = t; | |
0abe00c5 NS |
4295 | |
4296 | TYPE_VFIELD (t) = field; | |
4297 | ||
4298 | /* This class is non-empty. */ | |
58731fd1 | 4299 | CLASSTYPE_EMPTY_P (t) = 0; |
3ef397c1 | 4300 | |
1f84ec23 | 4301 | if (CLASSTYPE_N_BASECLASSES (t)) |
5c24fba6 MM |
4302 | /* If there were any baseclasses, they can't possibly be at |
4303 | offset zero any more, because that's where the vtable | |
4304 | pointer is. So, converting to a base class is going to | |
4305 | take work. */ | |
4306 | TYPE_BASE_CONVS_MAY_REQUIRE_CODE_P (t) = 1; | |
3ef397c1 | 4307 | |
0abe00c5 | 4308 | return field; |
3ef397c1 | 4309 | } |
5c24fba6 MM |
4310 | |
4311 | return NULL_TREE; | |
3ef397c1 MM |
4312 | } |
4313 | ||
2ef16140 MM |
4314 | /* Fixup the inline function given by INFO now that the class is |
4315 | complete. */ | |
08b962b0 | 4316 | |
2ef16140 | 4317 | static void |
94edc4ab | 4318 | fixup_pending_inline (tree fn) |
2ef16140 | 4319 | { |
0e5921e8 | 4320 | if (DECL_PENDING_INLINE_INFO (fn)) |
2ef16140 | 4321 | { |
0e5921e8 | 4322 | tree args = DECL_ARGUMENTS (fn); |
2ef16140 MM |
4323 | while (args) |
4324 | { | |
4325 | DECL_CONTEXT (args) = fn; | |
4326 | args = TREE_CHAIN (args); | |
4327 | } | |
4328 | } | |
4329 | } | |
08b962b0 | 4330 | |
2ef16140 MM |
4331 | /* Fixup the inline methods and friends in TYPE now that TYPE is |
4332 | complete. */ | |
08b962b0 | 4333 | |
2ef16140 | 4334 | static void |
94edc4ab | 4335 | fixup_inline_methods (tree type) |
08b962b0 | 4336 | { |
2ef16140 | 4337 | tree method = TYPE_METHODS (type); |
08b962b0 | 4338 | |
2ef16140 | 4339 | if (method && TREE_CODE (method) == TREE_VEC) |
08b962b0 | 4340 | { |
2ef16140 MM |
4341 | if (TREE_VEC_ELT (method, 1)) |
4342 | method = TREE_VEC_ELT (method, 1); | |
4343 | else if (TREE_VEC_ELT (method, 0)) | |
4344 | method = TREE_VEC_ELT (method, 0); | |
08b962b0 | 4345 | else |
2ef16140 | 4346 | method = TREE_VEC_ELT (method, 2); |
08b962b0 MM |
4347 | } |
4348 | ||
2ef16140 MM |
4349 | /* Do inline member functions. */ |
4350 | for (; method; method = TREE_CHAIN (method)) | |
0e5921e8 | 4351 | fixup_pending_inline (method); |
08b962b0 | 4352 | |
2ef16140 MM |
4353 | /* Do friends. */ |
4354 | for (method = CLASSTYPE_INLINE_FRIENDS (type); | |
4355 | method; | |
4356 | method = TREE_CHAIN (method)) | |
0e5921e8 | 4357 | fixup_pending_inline (TREE_VALUE (method)); |
351c54c8 | 4358 | CLASSTYPE_INLINE_FRIENDS (type) = NULL_TREE; |
2ef16140 | 4359 | } |
08b962b0 | 4360 | |
9d4c0187 MM |
4361 | /* Add OFFSET to all base types of BINFO which is a base in the |
4362 | hierarchy dominated by T. | |
80fd5f48 | 4363 | |
911a71a7 | 4364 | OFFSET, which is a type offset, is number of bytes. */ |
80fd5f48 MM |
4365 | |
4366 | static void | |
dbbf88d1 | 4367 | propagate_binfo_offsets (tree binfo, tree offset) |
80fd5f48 | 4368 | { |
911a71a7 MM |
4369 | int i; |
4370 | tree primary_binfo; | |
80fd5f48 | 4371 | |
911a71a7 MM |
4372 | /* Update BINFO's offset. */ |
4373 | BINFO_OFFSET (binfo) | |
4374 | = convert (sizetype, | |
4375 | size_binop (PLUS_EXPR, | |
4376 | convert (ssizetype, BINFO_OFFSET (binfo)), | |
4377 | offset)); | |
80fd5f48 | 4378 | |
911a71a7 MM |
4379 | /* Find the primary base class. */ |
4380 | primary_binfo = get_primary_binfo (binfo); | |
4381 | ||
4382 | /* Scan all of the bases, pushing the BINFO_OFFSET adjust | |
4383 | downwards. */ | |
4384 | for (i = -1; i < BINFO_N_BASETYPES (binfo); ++i) | |
80fd5f48 | 4385 | { |
911a71a7 | 4386 | tree base_binfo; |
80fd5f48 | 4387 | |
623fe76a NS |
4388 | /* On the first time through the loop, do the primary base. |
4389 | Because the primary base need not be an immediate base, we | |
4390 | must handle the primary base specially. */ | |
911a71a7 MM |
4391 | if (i == -1) |
4392 | { | |
4393 | if (!primary_binfo) | |
4394 | continue; | |
80fd5f48 | 4395 | |
911a71a7 MM |
4396 | base_binfo = primary_binfo; |
4397 | } | |
4398 | else | |
4399 | { | |
4400 | base_binfo = BINFO_BASETYPE (binfo, i); | |
4401 | /* Don't do the primary base twice. */ | |
4402 | if (base_binfo == primary_binfo) | |
4403 | continue; | |
4404 | } | |
4405 | ||
623fe76a | 4406 | /* Skip virtual bases that aren't our canonical primary base. */ |
911a71a7 | 4407 | if (TREE_VIA_VIRTUAL (base_binfo) |
dbbf88d1 | 4408 | && BINFO_PRIMARY_BASE_OF (base_binfo) != binfo) |
911a71a7 MM |
4409 | continue; |
4410 | ||
dbbf88d1 | 4411 | propagate_binfo_offsets (base_binfo, offset); |
911a71a7 | 4412 | } |
9d4c0187 MM |
4413 | } |
4414 | ||
17bbb839 | 4415 | /* Set BINFO_OFFSET for all of the virtual bases for RLI->T. Update |
c20118a8 MM |
4416 | TYPE_ALIGN and TYPE_SIZE for T. OFFSETS gives the location of |
4417 | empty subobjects of T. */ | |
80fd5f48 | 4418 | |
d2c5305b | 4419 | static void |
17bbb839 | 4420 | layout_virtual_bases (record_layout_info rli, splay_tree offsets) |
80fd5f48 | 4421 | { |
dbbf88d1 | 4422 | tree vbase; |
17bbb839 | 4423 | tree t = rli->t; |
eca7f13c | 4424 | bool first_vbase = true; |
17bbb839 | 4425 | tree *next_field; |
9785e4b1 MM |
4426 | |
4427 | if (CLASSTYPE_N_BASECLASSES (t) == 0) | |
4428 | return; | |
4429 | ||
17bbb839 MM |
4430 | if (!abi_version_at_least(2)) |
4431 | { | |
4432 | /* In G++ 3.2, we incorrectly rounded the size before laying out | |
4433 | the virtual bases. */ | |
4434 | finish_record_layout (rli, /*free_p=*/false); | |
9785e4b1 | 4435 | #ifdef STRUCTURE_SIZE_BOUNDARY |
17bbb839 MM |
4436 | /* Packed structures don't need to have minimum size. */ |
4437 | if (! TYPE_PACKED (t)) | |
fc555370 | 4438 | TYPE_ALIGN (t) = MAX (TYPE_ALIGN (t), (unsigned) STRUCTURE_SIZE_BOUNDARY); |
9785e4b1 | 4439 | #endif |
17bbb839 MM |
4440 | rli->offset = TYPE_SIZE_UNIT (t); |
4441 | rli->bitpos = bitsize_zero_node; | |
4442 | rli->record_align = TYPE_ALIGN (t); | |
4443 | } | |
80fd5f48 | 4444 | |
17bbb839 MM |
4445 | /* Find the last field. The artificial fields created for virtual |
4446 | bases will go after the last extant field to date. */ | |
4447 | next_field = &TYPE_FIELDS (t); | |
4448 | while (*next_field) | |
4449 | next_field = &TREE_CHAIN (*next_field); | |
80fd5f48 | 4450 | |
9d4c0187 | 4451 | /* Go through the virtual bases, allocating space for each virtual |
3461fba7 NS |
4452 | base that is not already a primary base class. These are |
4453 | allocated in inheritance graph order. */ | |
dbbf88d1 | 4454 | for (vbase = TYPE_BINFO (t); vbase; vbase = TREE_CHAIN (vbase)) |
c35cce41 | 4455 | { |
dbbf88d1 | 4456 | if (!TREE_VIA_VIRTUAL (vbase)) |
1f84ec23 | 4457 | continue; |
eca7f13c | 4458 | |
9965d119 | 4459 | if (!BINFO_PRIMARY_P (vbase)) |
c35cce41 | 4460 | { |
17bbb839 MM |
4461 | tree basetype = TREE_TYPE (vbase); |
4462 | ||
c35cce41 MM |
4463 | /* This virtual base is not a primary base of any class in the |
4464 | hierarchy, so we have to add space for it. */ | |
58731fd1 | 4465 | next_field = build_base_field (rli, vbase, |
17bbb839 | 4466 | offsets, next_field); |
9785e4b1 | 4467 | |
eca7f13c MM |
4468 | /* If the first virtual base might have been placed at a |
4469 | lower address, had we started from CLASSTYPE_SIZE, rather | |
4470 | than TYPE_SIZE, issue a warning. There can be both false | |
4471 | positives and false negatives from this warning in rare | |
4472 | cases; to deal with all the possibilities would probably | |
4473 | require performing both layout algorithms and comparing | |
4474 | the results which is not particularly tractable. */ | |
4475 | if (warn_abi | |
4476 | && first_vbase | |
17bbb839 MM |
4477 | && (tree_int_cst_lt |
4478 | (size_binop (CEIL_DIV_EXPR, | |
4479 | round_up (CLASSTYPE_SIZE (t), | |
4480 | CLASSTYPE_ALIGN (basetype)), | |
4481 | bitsize_unit_node), | |
4482 | BINFO_OFFSET (vbase)))) | |
eca7f13c MM |
4483 | warning ("offset of virtual base `%T' is not ABI-compliant and may change in a future version of GCC", |
4484 | basetype); | |
4485 | ||
eca7f13c | 4486 | first_vbase = false; |
c35cce41 MM |
4487 | } |
4488 | } | |
80fd5f48 MM |
4489 | } |
4490 | ||
ba9a991f MM |
4491 | /* Returns the offset of the byte just past the end of the base class |
4492 | BINFO. */ | |
4493 | ||
4494 | static tree | |
4495 | end_of_base (tree binfo) | |
4496 | { | |
4497 | tree size; | |
4498 | ||
4499 | if (is_empty_class (BINFO_TYPE (binfo))) | |
4500 | /* An empty class has zero CLASSTYPE_SIZE_UNIT, but we need to | |
4501 | allocate some space for it. It cannot have virtual bases, so | |
4502 | TYPE_SIZE_UNIT is fine. */ | |
4503 | size = TYPE_SIZE_UNIT (BINFO_TYPE (binfo)); | |
4504 | else | |
4505 | size = CLASSTYPE_SIZE_UNIT (BINFO_TYPE (binfo)); | |
4506 | ||
4507 | return size_binop (PLUS_EXPR, BINFO_OFFSET (binfo), size); | |
4508 | } | |
4509 | ||
9785e4b1 MM |
4510 | /* Returns the offset of the byte just past the end of the base class |
4511 | with the highest offset in T. If INCLUDE_VIRTUALS_P is zero, then | |
4512 | only non-virtual bases are included. */ | |
80fd5f48 | 4513 | |
17bbb839 | 4514 | static tree |
94edc4ab | 4515 | end_of_class (tree t, int include_virtuals_p) |
80fd5f48 | 4516 | { |
17bbb839 | 4517 | tree result = size_zero_node; |
ba9a991f MM |
4518 | tree binfo; |
4519 | tree offset; | |
9785e4b1 | 4520 | int i; |
80fd5f48 | 4521 | |
9785e4b1 MM |
4522 | for (i = 0; i < CLASSTYPE_N_BASECLASSES (t); ++i) |
4523 | { | |
ba9a991f | 4524 | binfo = BINFO_BASETYPE (TYPE_BINFO (t), i); |
9785e4b1 MM |
4525 | |
4526 | if (!include_virtuals_p | |
ba9a991f | 4527 | && TREE_VIA_VIRTUAL (binfo) |
8234c6c1 | 4528 | && BINFO_PRIMARY_BASE_OF (binfo) != TYPE_BINFO (t)) |
9785e4b1 | 4529 | continue; |
80fd5f48 | 4530 | |
ba9a991f | 4531 | offset = end_of_base (binfo); |
17bbb839 MM |
4532 | if (INT_CST_LT_UNSIGNED (result, offset)) |
4533 | result = offset; | |
9785e4b1 | 4534 | } |
80fd5f48 | 4535 | |
ba9a991f MM |
4536 | /* G++ 3.2 did not check indirect virtual bases. */ |
4537 | if (abi_version_at_least (2) && include_virtuals_p) | |
4538 | for (binfo = CLASSTYPE_VBASECLASSES (t); | |
4539 | binfo; | |
4540 | binfo = TREE_CHAIN (binfo)) | |
4541 | { | |
4542 | offset = end_of_base (TREE_VALUE (binfo)); | |
4543 | if (INT_CST_LT_UNSIGNED (result, offset)) | |
4544 | result = offset; | |
4545 | } | |
4546 | ||
9785e4b1 | 4547 | return result; |
80fd5f48 MM |
4548 | } |
4549 | ||
17bbb839 | 4550 | /* Warn about bases of T that are inaccessible because they are |
78b45a24 MM |
4551 | ambiguous. For example: |
4552 | ||
4553 | struct S {}; | |
4554 | struct T : public S {}; | |
4555 | struct U : public S, public T {}; | |
4556 | ||
4557 | Here, `(S*) new U' is not allowed because there are two `S' | |
4558 | subobjects of U. */ | |
4559 | ||
4560 | static void | |
94edc4ab | 4561 | warn_about_ambiguous_bases (tree t) |
78b45a24 MM |
4562 | { |
4563 | int i; | |
17bbb839 MM |
4564 | tree vbases; |
4565 | tree basetype; | |
78b45a24 | 4566 | |
17bbb839 | 4567 | /* Check direct bases. */ |
78b45a24 MM |
4568 | for (i = 0; i < CLASSTYPE_N_BASECLASSES (t); ++i) |
4569 | { | |
17bbb839 | 4570 | basetype = TYPE_BINFO_BASETYPE (t, i); |
78b45a24 | 4571 | |
2db1ab2d | 4572 | if (!lookup_base (t, basetype, ba_ignore | ba_quiet, NULL)) |
33bd39a2 | 4573 | warning ("direct base `%T' inaccessible in `%T' due to ambiguity", |
17bbb839 | 4574 | basetype, t); |
78b45a24 | 4575 | } |
17bbb839 MM |
4576 | |
4577 | /* Check for ambiguous virtual bases. */ | |
4578 | if (extra_warnings) | |
4579 | for (vbases = CLASSTYPE_VBASECLASSES (t); | |
4580 | vbases; | |
4581 | vbases = TREE_CHAIN (vbases)) | |
4582 | { | |
4583 | basetype = BINFO_TYPE (TREE_VALUE (vbases)); | |
4584 | ||
4585 | if (!lookup_base (t, basetype, ba_ignore | ba_quiet, NULL)) | |
4586 | warning ("virtual base `%T' inaccessible in `%T' due to ambiguity", | |
4587 | basetype, t); | |
4588 | } | |
78b45a24 MM |
4589 | } |
4590 | ||
c20118a8 MM |
4591 | /* Compare two INTEGER_CSTs K1 and K2. */ |
4592 | ||
4593 | static int | |
94edc4ab | 4594 | splay_tree_compare_integer_csts (splay_tree_key k1, splay_tree_key k2) |
c20118a8 MM |
4595 | { |
4596 | return tree_int_cst_compare ((tree) k1, (tree) k2); | |
4597 | } | |
4598 | ||
17bbb839 MM |
4599 | /* Increase the size indicated in RLI to account for empty classes |
4600 | that are "off the end" of the class. */ | |
4601 | ||
4602 | static void | |
4603 | include_empty_classes (record_layout_info rli) | |
4604 | { | |
4605 | tree eoc; | |
e3ccdd50 | 4606 | tree rli_size; |
17bbb839 MM |
4607 | |
4608 | /* It might be the case that we grew the class to allocate a | |
4609 | zero-sized base class. That won't be reflected in RLI, yet, | |
4610 | because we are willing to overlay multiple bases at the same | |
4611 | offset. However, now we need to make sure that RLI is big enough | |
4612 | to reflect the entire class. */ | |
4613 | eoc = end_of_class (rli->t, | |
4614 | CLASSTYPE_AS_BASE (rli->t) != NULL_TREE); | |
e3ccdd50 MM |
4615 | rli_size = rli_size_unit_so_far (rli); |
4616 | if (TREE_CODE (rli_size) == INTEGER_CST | |
4617 | && INT_CST_LT_UNSIGNED (rli_size, eoc)) | |
17bbb839 | 4618 | { |
43fe31f6 MM |
4619 | if (!abi_version_at_least (2)) |
4620 | /* In version 1 of the ABI, the size of a class that ends with | |
4621 | a bitfield was not rounded up to a whole multiple of a | |
4622 | byte. Because rli_size_unit_so_far returns only the number | |
4623 | of fully allocated bytes, any extra bits were not included | |
4624 | in the size. */ | |
4625 | rli->bitpos = round_down (rli->bitpos, BITS_PER_UNIT); | |
4626 | else | |
4627 | /* The size should have been rounded to a whole byte. */ | |
4628 | my_friendly_assert (tree_int_cst_equal (rli->bitpos, | |
4629 | round_down (rli->bitpos, | |
4630 | BITS_PER_UNIT)), | |
4631 | 20030903); | |
e3ccdd50 MM |
4632 | rli->bitpos |
4633 | = size_binop (PLUS_EXPR, | |
4634 | rli->bitpos, | |
4635 | size_binop (MULT_EXPR, | |
4636 | convert (bitsizetype, | |
4637 | size_binop (MINUS_EXPR, | |
4638 | eoc, rli_size)), | |
4639 | bitsize_int (BITS_PER_UNIT))); | |
4640 | normalize_rli (rli); | |
17bbb839 MM |
4641 | } |
4642 | } | |
4643 | ||
2ef16140 MM |
4644 | /* Calculate the TYPE_SIZE, TYPE_ALIGN, etc for T. Calculate |
4645 | BINFO_OFFSETs for all of the base-classes. Position the vtable | |
00a17e31 | 4646 | pointer. Accumulate declared virtual functions on VIRTUALS_P. */ |
607cf131 | 4647 | |
2ef16140 | 4648 | static void |
e93ee644 | 4649 | layout_class_type (tree t, tree *virtuals_p) |
2ef16140 | 4650 | { |
5c24fba6 MM |
4651 | tree non_static_data_members; |
4652 | tree field; | |
4653 | tree vptr; | |
4654 | record_layout_info rli; | |
c20118a8 MM |
4655 | /* Maps offsets (represented as INTEGER_CSTs) to a TREE_LIST of |
4656 | types that appear at that offset. */ | |
4657 | splay_tree empty_base_offsets; | |
eca7f13c MM |
4658 | /* True if the last field layed out was a bit-field. */ |
4659 | bool last_field_was_bitfield = false; | |
17bbb839 MM |
4660 | /* The location at which the next field should be inserted. */ |
4661 | tree *next_field; | |
4662 | /* T, as a base class. */ | |
4663 | tree base_t; | |
5c24fba6 MM |
4664 | |
4665 | /* Keep track of the first non-static data member. */ | |
4666 | non_static_data_members = TYPE_FIELDS (t); | |
4667 | ||
770ae6cc RK |
4668 | /* Start laying out the record. */ |
4669 | rli = start_record_layout (t); | |
534170eb | 4670 | |
8026246f MM |
4671 | /* If possible, we reuse the virtual function table pointer from one |
4672 | of our base classes. */ | |
e93ee644 | 4673 | determine_primary_base (t); |
8026246f | 4674 | |
5c24fba6 | 4675 | /* Create a pointer to our virtual function table. */ |
58731fd1 | 4676 | vptr = create_vtable_ptr (t, virtuals_p); |
5c24fba6 | 4677 | |
3461fba7 | 4678 | /* The vptr is always the first thing in the class. */ |
1f84ec23 | 4679 | if (vptr) |
5c24fba6 | 4680 | { |
17bbb839 MM |
4681 | TREE_CHAIN (vptr) = TYPE_FIELDS (t); |
4682 | TYPE_FIELDS (t) = vptr; | |
4683 | next_field = &TREE_CHAIN (vptr); | |
770ae6cc | 4684 | place_field (rli, vptr); |
5c24fba6 | 4685 | } |
17bbb839 MM |
4686 | else |
4687 | next_field = &TYPE_FIELDS (t); | |
5c24fba6 | 4688 | |
72a50ab0 | 4689 | /* Build FIELD_DECLs for all of the non-virtual base-types. */ |
c20118a8 MM |
4690 | empty_base_offsets = splay_tree_new (splay_tree_compare_integer_csts, |
4691 | NULL, NULL); | |
58731fd1 | 4692 | build_base_fields (rli, empty_base_offsets, next_field); |
06d9f09f | 4693 | |
5c24fba6 | 4694 | /* Layout the non-static data members. */ |
770ae6cc | 4695 | for (field = non_static_data_members; field; field = TREE_CHAIN (field)) |
5c24fba6 | 4696 | { |
01955e96 MM |
4697 | tree type; |
4698 | tree padding; | |
5c24fba6 MM |
4699 | |
4700 | /* We still pass things that aren't non-static data members to | |
4701 | the back-end, in case it wants to do something with them. */ | |
4702 | if (TREE_CODE (field) != FIELD_DECL) | |
4703 | { | |
770ae6cc | 4704 | place_field (rli, field); |
0154eaa8 MM |
4705 | /* If the static data member has incomplete type, keep track |
4706 | of it so that it can be completed later. (The handling | |
4707 | of pending statics in finish_record_layout is | |
4708 | insufficient; consider: | |
4709 | ||
4710 | struct S1; | |
4711 | struct S2 { static S1 s1; }; | |
4712 | ||
4713 | At this point, finish_record_layout will be called, but | |
4714 | S1 is still incomplete.) */ | |
4715 | if (TREE_CODE (field) == VAR_DECL) | |
4716 | maybe_register_incomplete_var (field); | |
5c24fba6 MM |
4717 | continue; |
4718 | } | |
4719 | ||
01955e96 | 4720 | type = TREE_TYPE (field); |
1e099144 MM |
4721 | |
4722 | padding = NULL_TREE; | |
01955e96 MM |
4723 | |
4724 | /* If this field is a bit-field whose width is greater than its | |
3461fba7 NS |
4725 | type, then there are some special rules for allocating |
4726 | it. */ | |
01955e96 | 4727 | if (DECL_C_BIT_FIELD (field) |
1f84ec23 | 4728 | && INT_CST_LT (TYPE_SIZE (type), DECL_SIZE (field))) |
01955e96 MM |
4729 | { |
4730 | integer_type_kind itk; | |
4731 | tree integer_type; | |
555456b1 | 4732 | bool was_unnamed_p = false; |
01955e96 MM |
4733 | /* We must allocate the bits as if suitably aligned for the |
4734 | longest integer type that fits in this many bits. type | |
4735 | of the field. Then, we are supposed to use the left over | |
4736 | bits as additional padding. */ | |
4737 | for (itk = itk_char; itk != itk_none; ++itk) | |
4738 | if (INT_CST_LT (DECL_SIZE (field), | |
4739 | TYPE_SIZE (integer_types[itk]))) | |
4740 | break; | |
4741 | ||
4742 | /* ITK now indicates a type that is too large for the | |
4743 | field. We have to back up by one to find the largest | |
4744 | type that fits. */ | |
4745 | integer_type = integer_types[itk - 1]; | |
2d3e278d | 4746 | |
1e099144 MM |
4747 | /* Figure out how much additional padding is required. GCC |
4748 | 3.2 always created a padding field, even if it had zero | |
4749 | width. */ | |
4750 | if (!abi_version_at_least (2) | |
4751 | || INT_CST_LT (TYPE_SIZE (integer_type), DECL_SIZE (field))) | |
2d3e278d | 4752 | { |
1e099144 MM |
4753 | if (abi_version_at_least (2) && TREE_CODE (t) == UNION_TYPE) |
4754 | /* In a union, the padding field must have the full width | |
4755 | of the bit-field; all fields start at offset zero. */ | |
4756 | padding = DECL_SIZE (field); | |
4757 | else | |
4758 | { | |
4759 | if (warn_abi && TREE_CODE (t) == UNION_TYPE) | |
4760 | warning ("size assigned to `%T' may not be " | |
4761 | "ABI-compliant and may change in a future " | |
4762 | "version of GCC", | |
4763 | t); | |
4764 | padding = size_binop (MINUS_EXPR, DECL_SIZE (field), | |
4765 | TYPE_SIZE (integer_type)); | |
4766 | } | |
2d3e278d | 4767 | } |
c9372112 | 4768 | #ifdef PCC_BITFIELD_TYPE_MATTERS |
63e5f567 MM |
4769 | /* An unnamed bitfield does not normally affect the |
4770 | alignment of the containing class on a target where | |
4771 | PCC_BITFIELD_TYPE_MATTERS. But, the C++ ABI does not | |
4772 | make any exceptions for unnamed bitfields when the | |
4773 | bitfields are longer than their types. Therefore, we | |
4774 | temporarily give the field a name. */ | |
4775 | if (PCC_BITFIELD_TYPE_MATTERS && !DECL_NAME (field)) | |
4776 | { | |
4777 | was_unnamed_p = true; | |
4778 | DECL_NAME (field) = make_anon_name (); | |
4779 | } | |
c9372112 | 4780 | #endif |
01955e96 MM |
4781 | DECL_SIZE (field) = TYPE_SIZE (integer_type); |
4782 | DECL_ALIGN (field) = TYPE_ALIGN (integer_type); | |
11cf4d18 | 4783 | DECL_USER_ALIGN (field) = TYPE_USER_ALIGN (integer_type); |
555456b1 MM |
4784 | layout_nonempty_base_or_field (rli, field, NULL_TREE, |
4785 | empty_base_offsets); | |
4786 | if (was_unnamed_p) | |
4787 | DECL_NAME (field) = NULL_TREE; | |
4788 | /* Now that layout has been performed, set the size of the | |
4789 | field to the size of its declared type; the rest of the | |
4790 | field is effectively invisible. */ | |
4791 | DECL_SIZE (field) = TYPE_SIZE (type); | |
29edb15c MM |
4792 | /* We must also reset the DECL_MODE of the field. */ |
4793 | if (abi_version_at_least (2)) | |
4794 | DECL_MODE (field) = TYPE_MODE (type); | |
4795 | else if (warn_abi | |
4796 | && DECL_MODE (field) != TYPE_MODE (type)) | |
4797 | /* Versions of G++ before G++ 3.4 did not reset the | |
4798 | DECL_MODE. */ | |
4799 | warning ("the offset of `%D' may not be ABI-compliant and may " | |
4800 | "change in a future version of GCC", field); | |
01955e96 | 4801 | } |
555456b1 MM |
4802 | else |
4803 | layout_nonempty_base_or_field (rli, field, NULL_TREE, | |
4804 | empty_base_offsets); | |
01955e96 | 4805 | |
2003cd37 MM |
4806 | /* Remember the location of any empty classes in FIELD. */ |
4807 | if (abi_version_at_least (2)) | |
4808 | record_subobject_offsets (TREE_TYPE (field), | |
4809 | byte_position(field), | |
4810 | empty_base_offsets, | |
4811 | /*vbases_p=*/1); | |
4812 | ||
eca7f13c MM |
4813 | /* If a bit-field does not immediately follow another bit-field, |
4814 | and yet it starts in the middle of a byte, we have failed to | |
4815 | comply with the ABI. */ | |
4816 | if (warn_abi | |
4817 | && DECL_C_BIT_FIELD (field) | |
4818 | && !last_field_was_bitfield | |
4819 | && !integer_zerop (size_binop (TRUNC_MOD_EXPR, | |
4820 | DECL_FIELD_BIT_OFFSET (field), | |
4821 | bitsize_unit_node))) | |
4822 | cp_warning_at ("offset of `%D' is not ABI-compliant and may change in a future version of GCC", | |
4823 | field); | |
4824 | ||
956d9305 MM |
4825 | /* G++ used to use DECL_FIELD_OFFSET as if it were the byte |
4826 | offset of the field. */ | |
4827 | if (warn_abi | |
4828 | && !tree_int_cst_equal (DECL_FIELD_OFFSET (field), | |
4829 | byte_position (field)) | |
4830 | && contains_empty_class_p (TREE_TYPE (field))) | |
4831 | cp_warning_at ("`%D' contains empty classes which may cause base " | |
4832 | "classes to be placed at different locations in a " | |
4833 | "future version of GCC", | |
4834 | field); | |
4835 | ||
01955e96 MM |
4836 | /* If we needed additional padding after this field, add it |
4837 | now. */ | |
4838 | if (padding) | |
4839 | { | |
4840 | tree padding_field; | |
4841 | ||
4842 | padding_field = build_decl (FIELD_DECL, | |
4843 | NULL_TREE, | |
4844 | char_type_node); | |
4845 | DECL_BIT_FIELD (padding_field) = 1; | |
4846 | DECL_SIZE (padding_field) = padding; | |
1e099144 | 4847 | DECL_CONTEXT (padding_field) = t; |
ea258926 | 4848 | DECL_ARTIFICIAL (padding_field) = 1; |
c20118a8 MM |
4849 | layout_nonempty_base_or_field (rli, padding_field, |
4850 | NULL_TREE, | |
17bbb839 | 4851 | empty_base_offsets); |
01955e96 | 4852 | } |
eca7f13c MM |
4853 | |
4854 | last_field_was_bitfield = DECL_C_BIT_FIELD (field); | |
5c24fba6 MM |
4855 | } |
4856 | ||
17bbb839 | 4857 | if (abi_version_at_least (2) && !integer_zerop (rli->bitpos)) |
e3ccdd50 MM |
4858 | { |
4859 | /* Make sure that we are on a byte boundary so that the size of | |
4860 | the class without virtual bases will always be a round number | |
4861 | of bytes. */ | |
4862 | rli->bitpos = round_up (rli->bitpos, BITS_PER_UNIT); | |
4863 | normalize_rli (rli); | |
4864 | } | |
17bbb839 | 4865 | |
8a874cb4 MM |
4866 | /* G++ 3.2 does not allow virtual bases to be overlaid with tail |
4867 | padding. */ | |
4868 | if (!abi_version_at_least (2)) | |
4869 | include_empty_classes(rli); | |
58010b57 | 4870 | |
3ef397c1 MM |
4871 | /* Delete all zero-width bit-fields from the list of fields. Now |
4872 | that the type is laid out they are no longer important. */ | |
4873 | remove_zero_width_bit_fields (t); | |
4874 | ||
17bbb839 MM |
4875 | /* Create the version of T used for virtual bases. We do not use |
4876 | make_aggr_type for this version; this is an artificial type. For | |
4877 | a POD type, we just reuse T. */ | |
58731fd1 | 4878 | if (CLASSTYPE_NON_POD_P (t) || CLASSTYPE_EMPTY_P (t)) |
06ceef4e | 4879 | { |
17bbb839 MM |
4880 | base_t = make_node (TREE_CODE (t)); |
4881 | ||
58731fd1 MM |
4882 | /* Set the size and alignment for the new type. In G++ 3.2, all |
4883 | empty classes were considered to have size zero when used as | |
4884 | base classes. */ | |
4885 | if (!abi_version_at_least (2) && CLASSTYPE_EMPTY_P (t)) | |
4886 | { | |
4887 | TYPE_SIZE (base_t) = bitsize_zero_node; | |
4888 | TYPE_SIZE_UNIT (base_t) = size_zero_node; | |
4889 | if (warn_abi && !integer_zerop (rli_size_unit_so_far (rli))) | |
4890 | warning ("layout of classes derived from empty class `%T' " | |
4891 | "may change in a future version of GCC", | |
4892 | t); | |
4893 | } | |
4894 | else | |
4895 | { | |
6b99d1c0 MM |
4896 | tree eoc; |
4897 | ||
4898 | /* If the ABI version is not at least two, and the last | |
4899 | field was a bit-field, RLI may not be on a byte | |
4900 | boundary. In particular, rli_size_unit_so_far might | |
4901 | indicate the last complete byte, while rli_size_so_far | |
4902 | indicates the total number of bits used. Therefore, | |
4903 | rli_size_so_far, rather than rli_size_unit_so_far, is | |
4904 | used to compute TYPE_SIZE_UNIT. */ | |
4905 | eoc = end_of_class (t, /*include_virtuals_p=*/0); | |
8a874cb4 MM |
4906 | TYPE_SIZE_UNIT (base_t) |
4907 | = size_binop (MAX_EXPR, | |
6b99d1c0 MM |
4908 | convert (sizetype, |
4909 | size_binop (CEIL_DIV_EXPR, | |
4910 | rli_size_so_far (rli), | |
4911 | bitsize_int (BITS_PER_UNIT))), | |
4912 | eoc); | |
8a874cb4 MM |
4913 | TYPE_SIZE (base_t) |
4914 | = size_binop (MAX_EXPR, | |
4915 | rli_size_so_far (rli), | |
4916 | size_binop (MULT_EXPR, | |
6b99d1c0 | 4917 | convert (bitsizetype, eoc), |
8a874cb4 | 4918 | bitsize_int (BITS_PER_UNIT))); |
58731fd1 | 4919 | } |
17bbb839 MM |
4920 | TYPE_ALIGN (base_t) = rli->record_align; |
4921 | TYPE_USER_ALIGN (base_t) = TYPE_USER_ALIGN (t); | |
4922 | ||
4923 | /* Copy the fields from T. */ | |
4924 | next_field = &TYPE_FIELDS (base_t); | |
4925 | for (field = TYPE_FIELDS (t); field; field = TREE_CHAIN (field)) | |
4926 | if (TREE_CODE (field) == FIELD_DECL) | |
4927 | { | |
4928 | *next_field = build_decl (FIELD_DECL, | |
4929 | DECL_NAME (field), | |
4930 | TREE_TYPE (field)); | |
4931 | DECL_CONTEXT (*next_field) = base_t; | |
4932 | DECL_FIELD_OFFSET (*next_field) = DECL_FIELD_OFFSET (field); | |
4933 | DECL_FIELD_BIT_OFFSET (*next_field) | |
4934 | = DECL_FIELD_BIT_OFFSET (field); | |
4935 | next_field = &TREE_CHAIN (*next_field); | |
4936 | } | |
4937 | ||
4938 | /* Record the base version of the type. */ | |
4939 | CLASSTYPE_AS_BASE (t) = base_t; | |
5a5cccaa | 4940 | TYPE_CONTEXT (base_t) = t; |
83b14b88 | 4941 | } |
1f84ec23 | 4942 | else |
17bbb839 | 4943 | CLASSTYPE_AS_BASE (t) = t; |
0b41abe6 | 4944 | |
5ec1192e MM |
4945 | /* Every empty class contains an empty class. */ |
4946 | if (CLASSTYPE_EMPTY_P (t)) | |
4947 | CLASSTYPE_CONTAINS_EMPTY_CLASS_P (t) = 1; | |
4948 | ||
8d08fdba MS |
4949 | /* Set the TYPE_DECL for this type to contain the right |
4950 | value for DECL_OFFSET, so that we can use it as part | |
4951 | of a COMPONENT_REF for multiple inheritance. */ | |
d2e5ee5c | 4952 | layout_decl (TYPE_MAIN_DECL (t), 0); |
8d08fdba | 4953 | |
7177d104 MS |
4954 | /* Now fix up any virtual base class types that we left lying |
4955 | around. We must get these done before we try to lay out the | |
5c24fba6 MM |
4956 | virtual function table. As a side-effect, this will remove the |
4957 | base subobject fields. */ | |
17bbb839 MM |
4958 | layout_virtual_bases (rli, empty_base_offsets); |
4959 | ||
4960 | /* Make sure that empty classes are reflected in RLI at this | |
4961 | point. */ | |
4962 | include_empty_classes(rli); | |
4963 | ||
4964 | /* Make sure not to create any structures with zero size. */ | |
58731fd1 | 4965 | if (integer_zerop (rli_size_unit_so_far (rli)) && CLASSTYPE_EMPTY_P (t)) |
17bbb839 MM |
4966 | place_field (rli, |
4967 | build_decl (FIELD_DECL, NULL_TREE, char_type_node)); | |
4968 | ||
4969 | /* Let the back-end lay out the type. */ | |
4970 | finish_record_layout (rli, /*free_p=*/true); | |
9785e4b1 | 4971 | |
17bbb839 MM |
4972 | /* Warn about bases that can't be talked about due to ambiguity. */ |
4973 | warn_about_ambiguous_bases (t); | |
78b45a24 | 4974 | |
9785e4b1 | 4975 | /* Clean up. */ |
c20118a8 | 4976 | splay_tree_delete (empty_base_offsets); |
2ef16140 | 4977 | } |
c35cce41 | 4978 | |
9aad8f83 MA |
4979 | /* Returns the virtual function with which the vtable for TYPE is |
4980 | emitted, or NULL_TREE if that heuristic is not applicable to TYPE. */ | |
4981 | ||
4982 | static tree | |
4983 | key_method (tree type) | |
4984 | { | |
4985 | tree method; | |
4986 | ||
4987 | if (TYPE_FOR_JAVA (type) | |
4988 | || processing_template_decl | |
4989 | || CLASSTYPE_TEMPLATE_INSTANTIATION (type) | |
4990 | || CLASSTYPE_INTERFACE_KNOWN (type)) | |
4991 | return NULL_TREE; | |
4992 | ||
4993 | for (method = TYPE_METHODS (type); method != NULL_TREE; | |
4994 | method = TREE_CHAIN (method)) | |
4995 | if (DECL_VINDEX (method) != NULL_TREE | |
4996 | && ! DECL_DECLARED_INLINE_P (method) | |
4997 | && ! DECL_PURE_VIRTUAL_P (method)) | |
4998 | return method; | |
4999 | ||
5000 | return NULL_TREE; | |
5001 | } | |
5002 | ||
548502d3 MM |
5003 | /* Perform processing required when the definition of T (a class type) |
5004 | is complete. */ | |
2ef16140 MM |
5005 | |
5006 | void | |
94edc4ab | 5007 | finish_struct_1 (tree t) |
2ef16140 MM |
5008 | { |
5009 | tree x; | |
00a17e31 | 5010 | /* A TREE_LIST. The TREE_VALUE of each node is a FUNCTION_DECL. */ |
e6858a84 | 5011 | tree virtuals = NULL_TREE; |
2ef16140 MM |
5012 | int n_fields = 0; |
5013 | tree vfield; | |
2ef16140 | 5014 | |
d0f062fb | 5015 | if (COMPLETE_TYPE_P (t)) |
2ef16140 MM |
5016 | { |
5017 | if (IS_AGGR_TYPE (t)) | |
33bd39a2 | 5018 | error ("redefinition of `%#T'", t); |
2ef16140 | 5019 | else |
a98facb0 | 5020 | abort (); |
2ef16140 MM |
5021 | popclass (); |
5022 | return; | |
5023 | } | |
5024 | ||
2ef16140 MM |
5025 | /* If this type was previously laid out as a forward reference, |
5026 | make sure we lay it out again. */ | |
2ef16140 | 5027 | TYPE_SIZE (t) = NULL_TREE; |
911a71a7 | 5028 | CLASSTYPE_PRIMARY_BINFO (t) = NULL_TREE; |
2ef16140 | 5029 | |
6d0a3f67 NS |
5030 | fixup_inline_methods (t); |
5031 | ||
5ec1192e MM |
5032 | /* Make assumptions about the class; we'll reset the flags if |
5033 | necessary. */ | |
58731fd1 MM |
5034 | CLASSTYPE_EMPTY_P (t) = 1; |
5035 | CLASSTYPE_NEARLY_EMPTY_P (t) = 1; | |
5ec1192e | 5036 | CLASSTYPE_CONTAINS_EMPTY_CLASS_P (t) = 0; |
58731fd1 | 5037 | |
2ef16140 | 5038 | /* Do end-of-class semantic processing: checking the validity of the |
03702748 | 5039 | bases and members and add implicitly generated methods. */ |
58731fd1 | 5040 | check_bases_and_members (t); |
2ef16140 | 5041 | |
9aad8f83 | 5042 | /* Find the key method */ |
a63996f1 | 5043 | if (TYPE_CONTAINS_VPTR_P (t)) |
9aad8f83 MA |
5044 | { |
5045 | CLASSTYPE_KEY_METHOD (t) = key_method (t); | |
5046 | ||
5047 | /* If a polymorphic class has no key method, we may emit the vtable | |
9bcb9aae | 5048 | in every translation unit where the class definition appears. */ |
9aad8f83 MA |
5049 | if (CLASSTYPE_KEY_METHOD (t) == NULL_TREE) |
5050 | keyed_classes = tree_cons (NULL_TREE, t, keyed_classes); | |
5051 | } | |
5052 | ||
2ef16140 | 5053 | /* Layout the class itself. */ |
e93ee644 | 5054 | layout_class_type (t, &virtuals); |
8ebeee52 | 5055 | |
d0cd8b44 | 5056 | /* Make sure that we get our own copy of the vfield FIELD_DECL. */ |
3ef397c1 | 5057 | vfield = TYPE_VFIELD (t); |
d60d223b | 5058 | if (vfield && CLASSTYPE_HAS_PRIMARY_BASE_P (t)) |
2986ae00 | 5059 | { |
d60d223b NS |
5060 | tree primary = CLASSTYPE_PRIMARY_BINFO (t); |
5061 | ||
5062 | my_friendly_assert (same_type_p (DECL_FIELD_CONTEXT (vfield), | |
5063 | BINFO_TYPE (primary)), | |
5064 | 20010726); | |
00a17e31 | 5065 | /* The vtable better be at the start. */ |
d60d223b NS |
5066 | my_friendly_assert (integer_zerop (DECL_FIELD_OFFSET (vfield)), |
5067 | 20010726); | |
5068 | my_friendly_assert (integer_zerop (BINFO_OFFSET (primary)), | |
5069 | 20010726); | |
5070 | ||
0acf7199 | 5071 | vfield = copy_decl (vfield); |
2986ae00 | 5072 | DECL_FIELD_CONTEXT (vfield) = t; |
d3a3fb6a | 5073 | TYPE_VFIELD (t) = vfield; |
2986ae00 | 5074 | } |
d60d223b NS |
5075 | else |
5076 | my_friendly_assert (!vfield || DECL_FIELD_CONTEXT (vfield) == t, 20010726); | |
4c6b7393 | 5077 | |
e93ee644 | 5078 | virtuals = modify_all_vtables (t, nreverse (virtuals)); |
db5ae43f | 5079 | |
23656158 MM |
5080 | /* If we created a new vtbl pointer for this class, add it to the |
5081 | list. */ | |
5082 | if (TYPE_VFIELD (t) && !CLASSTYPE_HAS_PRIMARY_BASE_P (t)) | |
5083 | CLASSTYPE_VFIELDS (t) | |
5084 | = chainon (CLASSTYPE_VFIELDS (t), build_tree_list (NULL_TREE, t)); | |
5085 | ||
5e19c053 | 5086 | /* If necessary, create the primary vtable for this class. */ |
e6858a84 | 5087 | if (virtuals || TYPE_CONTAINS_VPTR_P (t)) |
8d08fdba | 5088 | { |
8d08fdba | 5089 | /* We must enter these virtuals into the table. */ |
3ef397c1 | 5090 | if (!CLASSTYPE_HAS_PRIMARY_BASE_P (t)) |
da3d4dfa | 5091 | build_primary_vtable (NULL_TREE, t); |
dbbf88d1 | 5092 | else if (! BINFO_NEW_VTABLE_MARKED (TYPE_BINFO (t))) |
0533d788 MM |
5093 | /* Here we know enough to change the type of our virtual |
5094 | function table, but we will wait until later this function. */ | |
28531dd0 | 5095 | build_primary_vtable (CLASSTYPE_PRIMARY_BINFO (t), t); |
8d08fdba MS |
5096 | } |
5097 | ||
bbd15aac | 5098 | if (TYPE_CONTAINS_VPTR_P (t)) |
8d08fdba | 5099 | { |
e93ee644 MM |
5100 | int vindex; |
5101 | tree fn; | |
5102 | ||
1eb4bea9 MM |
5103 | if (TYPE_BINFO_VTABLE (t)) |
5104 | my_friendly_assert (DECL_VIRTUAL_P (TYPE_BINFO_VTABLE (t)), | |
5105 | 20000116); | |
5106 | if (!CLASSTYPE_HAS_PRIMARY_BASE_P (t)) | |
5107 | my_friendly_assert (TYPE_BINFO_VIRTUALS (t) == NULL_TREE, | |
5108 | 20000116); | |
5109 | ||
e6858a84 NS |
5110 | /* Add entries for virtual functions introduced by this class. */ |
5111 | TYPE_BINFO_VIRTUALS (t) = chainon (TYPE_BINFO_VIRTUALS (t), virtuals); | |
e93ee644 MM |
5112 | |
5113 | /* Set DECL_VINDEX for all functions declared in this class. */ | |
5114 | for (vindex = 0, fn = BINFO_VIRTUALS (TYPE_BINFO (t)); | |
5115 | fn; | |
5116 | fn = TREE_CHAIN (fn), | |
5117 | vindex += (TARGET_VTABLE_USES_DESCRIPTORS | |
5118 | ? TARGET_VTABLE_USES_DESCRIPTORS : 1)) | |
4977bab6 ZW |
5119 | { |
5120 | tree fndecl = BV_FN (fn); | |
5121 | ||
5122 | if (DECL_THUNK_P (fndecl)) | |
5123 | /* A thunk. We should never be calling this entry directly | |
5124 | from this vtable -- we'd use the entry for the non | |
5125 | thunk base function. */ | |
5126 | DECL_VINDEX (fndecl) = NULL_TREE; | |
5127 | else if (TREE_CODE (DECL_VINDEX (fndecl)) != INTEGER_CST) | |
5128 | DECL_VINDEX (fndecl) = build_shared_int_cst (vindex); | |
5129 | } | |
8d08fdba MS |
5130 | } |
5131 | ||
d2c5305b | 5132 | finish_struct_bits (t); |
8d08fdba | 5133 | |
f30432d7 MS |
5134 | /* Complete the rtl for any static member objects of the type we're |
5135 | working on. */ | |
58010b57 | 5136 | for (x = TYPE_FIELDS (t); x; x = TREE_CHAIN (x)) |
19e7881c | 5137 | if (TREE_CODE (x) == VAR_DECL && TREE_STATIC (x) |
c7f4981a | 5138 | && same_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (x)), t)) |
19e7881c | 5139 | DECL_MODE (x) = TYPE_MODE (t); |
8d08fdba | 5140 | |
f90cdf34 | 5141 | /* Done with FIELDS...now decide whether to sort these for |
58010b57 | 5142 | faster lookups later. |
f90cdf34 | 5143 | |
6c73ad72 | 5144 | We use a small number because most searches fail (succeeding |
f90cdf34 MT |
5145 | ultimately as the search bores through the inheritance |
5146 | hierarchy), and we want this failure to occur quickly. */ | |
5147 | ||
58010b57 MM |
5148 | n_fields = count_fields (TYPE_FIELDS (t)); |
5149 | if (n_fields > 7) | |
f90cdf34 | 5150 | { |
d07605f5 AP |
5151 | struct sorted_fields_type *field_vec = ggc_alloc (sizeof (struct sorted_fields_type) |
5152 | + n_fields * sizeof (tree)); | |
5153 | field_vec->len = n_fields; | |
5154 | add_fields_to_record_type (TYPE_FIELDS (t), field_vec, 0); | |
5155 | qsort (field_vec->elts, n_fields, sizeof (tree), | |
17211ab5 | 5156 | field_decl_cmp); |
f90cdf34 MT |
5157 | if (! DECL_LANG_SPECIFIC (TYPE_MAIN_DECL (t))) |
5158 | retrofit_lang_decl (TYPE_MAIN_DECL (t)); | |
5159 | DECL_SORTED_FIELDS (TYPE_MAIN_DECL (t)) = field_vec; | |
5160 | } | |
5161 | ||
8d08fdba MS |
5162 | if (TYPE_HAS_CONSTRUCTOR (t)) |
5163 | { | |
5164 | tree vfields = CLASSTYPE_VFIELDS (t); | |
5165 | ||
dd98e14f NS |
5166 | for (vfields = CLASSTYPE_VFIELDS (t); |
5167 | vfields; vfields = TREE_CHAIN (vfields)) | |
5168 | /* Mark the fact that constructor for T could affect anybody | |
5169 | inheriting from T who wants to initialize vtables for | |
5170 | VFIELDS's type. */ | |
5171 | if (VF_BINFO_VALUE (vfields)) | |
5172 | TREE_ADDRESSABLE (vfields) = 1; | |
8d08fdba | 5173 | } |
8d08fdba | 5174 | |
8d7a5379 MM |
5175 | /* Make the rtl for any new vtables we have created, and unmark |
5176 | the base types we marked. */ | |
5177 | finish_vtbls (t); | |
9965d119 | 5178 | |
23656158 MM |
5179 | /* Build the VTT for T. */ |
5180 | build_vtt (t); | |
8d7a5379 | 5181 | |
0830ae44 NS |
5182 | if (warn_nonvdtor && TYPE_POLYMORPHIC_P (t) && TYPE_HAS_DESTRUCTOR (t) |
5183 | && DECL_VINDEX (TREE_VEC_ELT (CLASSTYPE_METHOD_VEC (t), 1)) == NULL_TREE) | |
33bd39a2 | 5184 | warning ("`%#T' has virtual functions but non-virtual destructor", t); |
8d08fdba | 5185 | |
0154eaa8 | 5186 | complete_vars (t); |
8d08fdba | 5187 | |
9e9ff709 MS |
5188 | if (warn_overloaded_virtual) |
5189 | warn_hidden (t); | |
8d08fdba | 5190 | |
ae673f14 | 5191 | maybe_suppress_debug_info (t); |
8d08fdba | 5192 | |
b7442fb5 NS |
5193 | dump_class_hierarchy (t); |
5194 | ||
d2e5ee5c | 5195 | /* Finish debugging output for this type. */ |
881c6935 | 5196 | rest_of_type_compilation (t, ! LOCAL_CLASS_P (t)); |
8d08fdba | 5197 | } |
f30432d7 | 5198 | |
61a127b3 MM |
5199 | /* When T was built up, the member declarations were added in reverse |
5200 | order. Rearrange them to declaration order. */ | |
5201 | ||
5202 | void | |
94edc4ab | 5203 | unreverse_member_declarations (tree t) |
61a127b3 MM |
5204 | { |
5205 | tree next; | |
5206 | tree prev; | |
5207 | tree x; | |
5208 | ||
7088fca9 KL |
5209 | /* The following lists are all in reverse order. Put them in |
5210 | declaration order now. */ | |
61a127b3 | 5211 | TYPE_METHODS (t) = nreverse (TYPE_METHODS (t)); |
7088fca9 | 5212 | CLASSTYPE_DECL_LIST (t) = nreverse (CLASSTYPE_DECL_LIST (t)); |
61a127b3 MM |
5213 | |
5214 | /* Actually, for the TYPE_FIELDS, only the non TYPE_DECLs are in | |
5215 | reverse order, so we can't just use nreverse. */ | |
5216 | prev = NULL_TREE; | |
5217 | for (x = TYPE_FIELDS (t); | |
5218 | x && TREE_CODE (x) != TYPE_DECL; | |
5219 | x = next) | |
5220 | { | |
5221 | next = TREE_CHAIN (x); | |
5222 | TREE_CHAIN (x) = prev; | |
5223 | prev = x; | |
5224 | } | |
5225 | if (prev) | |
5226 | { | |
5227 | TREE_CHAIN (TYPE_FIELDS (t)) = x; | |
5228 | if (prev) | |
5229 | TYPE_FIELDS (t) = prev; | |
5230 | } | |
5231 | } | |
5232 | ||
f30432d7 | 5233 | tree |
94edc4ab | 5234 | finish_struct (tree t, tree attributes) |
f30432d7 | 5235 | { |
82a98427 | 5236 | location_t saved_loc = input_location; |
1f0d71c5 | 5237 | |
61a127b3 MM |
5238 | /* Now that we've got all the field declarations, reverse everything |
5239 | as necessary. */ | |
5240 | unreverse_member_declarations (t); | |
f30432d7 | 5241 | |
91d231cb | 5242 | cplus_decl_attributes (&t, attributes, (int) ATTR_FLAG_TYPE_IN_PLACE); |
6467930b | 5243 | |
1f0d71c5 NS |
5244 | /* Nadger the current location so that diagnostics point to the start of |
5245 | the struct, not the end. */ | |
f31686a3 | 5246 | input_location = DECL_SOURCE_LOCATION (TYPE_NAME (t)); |
1f0d71c5 | 5247 | |
5566b478 | 5248 | if (processing_template_decl) |
f30432d7 | 5249 | { |
b0e0b31f | 5250 | finish_struct_methods (t); |
867580ce | 5251 | TYPE_SIZE (t) = bitsize_zero_node; |
6f1b4c42 | 5252 | } |
f30432d7 | 5253 | else |
9f33663b | 5254 | finish_struct_1 (t); |
5566b478 | 5255 | |
82a98427 | 5256 | input_location = saved_loc; |
1f0d71c5 | 5257 | |
5566b478 | 5258 | TYPE_BEING_DEFINED (t) = 0; |
8f032717 | 5259 | |
5566b478 | 5260 | if (current_class_type) |
b74a0560 | 5261 | popclass (); |
5566b478 | 5262 | else |
357351e5 | 5263 | error ("trying to finish struct, but kicked out due to previous parse errors"); |
5566b478 | 5264 | |
5f261ba9 MM |
5265 | if (processing_template_decl && at_function_scope_p ()) |
5266 | add_stmt (build_min (TAG_DEFN, t)); | |
ae673f14 | 5267 | |
5566b478 | 5268 | return t; |
f30432d7 | 5269 | } |
8d08fdba | 5270 | \f |
51ddb82e | 5271 | /* Return the dynamic type of INSTANCE, if known. |
8d08fdba MS |
5272 | Used to determine whether the virtual function table is needed |
5273 | or not. | |
5274 | ||
5275 | *NONNULL is set iff INSTANCE can be known to be nonnull, regardless | |
97d953bb MM |
5276 | of our knowledge of its type. *NONNULL should be initialized |
5277 | before this function is called. */ | |
e92cc029 | 5278 | |
d8e178a0 | 5279 | static tree |
94edc4ab | 5280 | fixed_type_or_null (tree instance, int* nonnull, int* cdtorp) |
8d08fdba MS |
5281 | { |
5282 | switch (TREE_CODE (instance)) | |
5283 | { | |
5284 | case INDIRECT_REF: | |
608afcc5 | 5285 | if (POINTER_TYPE_P (TREE_TYPE (instance))) |
a0de9d20 JM |
5286 | return NULL_TREE; |
5287 | else | |
5288 | return fixed_type_or_null (TREE_OPERAND (instance, 0), | |
5289 | nonnull, cdtorp); | |
5290 | ||
8d08fdba MS |
5291 | case CALL_EXPR: |
5292 | /* This is a call to a constructor, hence it's never zero. */ | |
5293 | if (TREE_HAS_CONSTRUCTOR (instance)) | |
5294 | { | |
5295 | if (nonnull) | |
5296 | *nonnull = 1; | |
51ddb82e | 5297 | return TREE_TYPE (instance); |
8d08fdba | 5298 | } |
51ddb82e | 5299 | return NULL_TREE; |
8d08fdba MS |
5300 | |
5301 | case SAVE_EXPR: | |
5302 | /* This is a call to a constructor, hence it's never zero. */ | |
5303 | if (TREE_HAS_CONSTRUCTOR (instance)) | |
5304 | { | |
5305 | if (nonnull) | |
5306 | *nonnull = 1; | |
51ddb82e | 5307 | return TREE_TYPE (instance); |
8d08fdba | 5308 | } |
394fd776 | 5309 | return fixed_type_or_null (TREE_OPERAND (instance, 0), nonnull, cdtorp); |
8d08fdba MS |
5310 | |
5311 | case RTL_EXPR: | |
51ddb82e | 5312 | return NULL_TREE; |
8d08fdba MS |
5313 | |
5314 | case PLUS_EXPR: | |
5315 | case MINUS_EXPR: | |
394fd776 NS |
5316 | if (TREE_CODE (TREE_OPERAND (instance, 0)) == ADDR_EXPR) |
5317 | return fixed_type_or_null (TREE_OPERAND (instance, 0), nonnull, cdtorp); | |
8d08fdba MS |
5318 | if (TREE_CODE (TREE_OPERAND (instance, 1)) == INTEGER_CST) |
5319 | /* Propagate nonnull. */ | |
f63ab951 | 5320 | return fixed_type_or_null (TREE_OPERAND (instance, 0), nonnull, cdtorp); |
51ddb82e | 5321 | return NULL_TREE; |
8d08fdba MS |
5322 | |
5323 | case NOP_EXPR: | |
5324 | case CONVERT_EXPR: | |
394fd776 | 5325 | return fixed_type_or_null (TREE_OPERAND (instance, 0), nonnull, cdtorp); |
8d08fdba MS |
5326 | |
5327 | case ADDR_EXPR: | |
5328 | if (nonnull) | |
5329 | *nonnull = 1; | |
394fd776 | 5330 | return fixed_type_or_null (TREE_OPERAND (instance, 0), nonnull, cdtorp); |
8d08fdba MS |
5331 | |
5332 | case COMPONENT_REF: | |
394fd776 | 5333 | return fixed_type_or_null (TREE_OPERAND (instance, 1), nonnull, cdtorp); |
8d08fdba | 5334 | |
8d08fdba MS |
5335 | case VAR_DECL: |
5336 | case FIELD_DECL: | |
5337 | if (TREE_CODE (TREE_TYPE (instance)) == ARRAY_TYPE | |
5338 | && IS_AGGR_TYPE (TREE_TYPE (TREE_TYPE (instance)))) | |
5339 | { | |
5340 | if (nonnull) | |
5341 | *nonnull = 1; | |
51ddb82e | 5342 | return TREE_TYPE (TREE_TYPE (instance)); |
8d08fdba | 5343 | } |
e92cc029 | 5344 | /* fall through... */ |
8d08fdba MS |
5345 | case TARGET_EXPR: |
5346 | case PARM_DECL: | |
f63ab951 | 5347 | case RESULT_DECL: |
8d08fdba MS |
5348 | if (IS_AGGR_TYPE (TREE_TYPE (instance))) |
5349 | { | |
5350 | if (nonnull) | |
5351 | *nonnull = 1; | |
51ddb82e | 5352 | return TREE_TYPE (instance); |
8d08fdba | 5353 | } |
394fd776 NS |
5354 | else if (instance == current_class_ptr) |
5355 | { | |
5356 | if (nonnull) | |
5357 | *nonnull = 1; | |
5358 | ||
00a17e31 | 5359 | /* if we're in a ctor or dtor, we know our type. */ |
394fd776 NS |
5360 | if (DECL_LANG_SPECIFIC (current_function_decl) |
5361 | && (DECL_CONSTRUCTOR_P (current_function_decl) | |
5362 | || DECL_DESTRUCTOR_P (current_function_decl))) | |
5363 | { | |
5364 | if (cdtorp) | |
5365 | *cdtorp = 1; | |
5366 | return TREE_TYPE (TREE_TYPE (instance)); | |
5367 | } | |
5368 | } | |
5369 | else if (TREE_CODE (TREE_TYPE (instance)) == REFERENCE_TYPE) | |
5370 | { | |
5371 | /* Reference variables should be references to objects. */ | |
5372 | if (nonnull) | |
8d08fdba | 5373 | *nonnull = 1; |
772f8889 MM |
5374 | |
5375 | /* DECL_VAR_MARKED_P is used to prevent recursion; a | |
5376 | variable's initializer may refer to the variable | |
5377 | itself. */ | |
5378 | if (TREE_CODE (instance) == VAR_DECL | |
5379 | && DECL_INITIAL (instance) | |
5380 | && !DECL_VAR_MARKED_P (instance)) | |
5381 | { | |
5382 | tree type; | |
5383 | DECL_VAR_MARKED_P (instance) = 1; | |
5384 | type = fixed_type_or_null (DECL_INITIAL (instance), | |
5385 | nonnull, cdtorp); | |
5386 | DECL_VAR_MARKED_P (instance) = 0; | |
5387 | return type; | |
5388 | } | |
8d08fdba | 5389 | } |
51ddb82e | 5390 | return NULL_TREE; |
8d08fdba MS |
5391 | |
5392 | default: | |
51ddb82e | 5393 | return NULL_TREE; |
8d08fdba MS |
5394 | } |
5395 | } | |
51ddb82e | 5396 | |
838dfd8a | 5397 | /* Return nonzero if the dynamic type of INSTANCE is known, and |
338d90b8 NS |
5398 | equivalent to the static type. We also handle the case where |
5399 | INSTANCE is really a pointer. Return negative if this is a | |
5400 | ctor/dtor. There the dynamic type is known, but this might not be | |
5401 | the most derived base of the original object, and hence virtual | |
5402 | bases may not be layed out according to this type. | |
51ddb82e JM |
5403 | |
5404 | Used to determine whether the virtual function table is needed | |
5405 | or not. | |
5406 | ||
5407 | *NONNULL is set iff INSTANCE can be known to be nonnull, regardless | |
97d953bb MM |
5408 | of our knowledge of its type. *NONNULL should be initialized |
5409 | before this function is called. */ | |
51ddb82e JM |
5410 | |
5411 | int | |
94edc4ab | 5412 | resolves_to_fixed_type_p (tree instance, int* nonnull) |
51ddb82e JM |
5413 | { |
5414 | tree t = TREE_TYPE (instance); | |
394fd776 NS |
5415 | int cdtorp = 0; |
5416 | ||
5417 | tree fixed = fixed_type_or_null (instance, nonnull, &cdtorp); | |
51ddb82e JM |
5418 | if (fixed == NULL_TREE) |
5419 | return 0; | |
5420 | if (POINTER_TYPE_P (t)) | |
5421 | t = TREE_TYPE (t); | |
394fd776 NS |
5422 | if (!same_type_ignoring_top_level_qualifiers_p (t, fixed)) |
5423 | return 0; | |
5424 | return cdtorp ? -1 : 1; | |
51ddb82e JM |
5425 | } |
5426 | ||
8d08fdba MS |
5427 | \f |
5428 | void | |
94edc4ab | 5429 | init_class_processing (void) |
8d08fdba MS |
5430 | { |
5431 | current_class_depth = 0; | |
61a127b3 MM |
5432 | current_class_stack_size = 10; |
5433 | current_class_stack | |
c68b0a84 | 5434 | = xmalloc (current_class_stack_size * sizeof (struct class_stack_node)); |
1f6e1acc | 5435 | VARRAY_TREE_INIT (local_classes, 8, "local_classes"); |
8d08fdba | 5436 | |
0e5921e8 ZW |
5437 | ridpointers[(int) RID_PUBLIC] = access_public_node; |
5438 | ridpointers[(int) RID_PRIVATE] = access_private_node; | |
5439 | ridpointers[(int) RID_PROTECTED] = access_protected_node; | |
8d08fdba MS |
5440 | } |
5441 | ||
a723baf1 MM |
5442 | /* Set global variables CURRENT_CLASS_NAME and CURRENT_CLASS_TYPE as |
5443 | appropriate for TYPE. | |
8d08fdba | 5444 | |
8d08fdba MS |
5445 | So that we may avoid calls to lookup_name, we cache the _TYPE |
5446 | nodes of local TYPE_DECLs in the TREE_TYPE field of the name. | |
5447 | ||
5448 | For multiple inheritance, we perform a two-pass depth-first search | |
5449 | of the type lattice. The first pass performs a pre-order search, | |
5450 | marking types after the type has had its fields installed in | |
5451 | the appropriate IDENTIFIER_CLASS_VALUE slot. The second pass merely | |
5452 | unmarks the marked types. If a field or member function name | |
5453 | appears in an ambiguous way, the IDENTIFIER_CLASS_VALUE of | |
5454 | that name becomes `error_mark_node'. */ | |
5455 | ||
5456 | void | |
29370796 | 5457 | pushclass (tree type) |
8d08fdba | 5458 | { |
7fb4a8f7 | 5459 | type = TYPE_MAIN_VARIANT (type); |
8d08fdba | 5460 | |
61a127b3 MM |
5461 | /* Make sure there is enough room for the new entry on the stack. */ |
5462 | if (current_class_depth + 1 >= current_class_stack_size) | |
8d08fdba | 5463 | { |
61a127b3 MM |
5464 | current_class_stack_size *= 2; |
5465 | current_class_stack | |
c68b0a84 KG |
5466 | = xrealloc (current_class_stack, |
5467 | current_class_stack_size | |
5468 | * sizeof (struct class_stack_node)); | |
8d08fdba MS |
5469 | } |
5470 | ||
61a127b3 MM |
5471 | /* Insert a new entry on the class stack. */ |
5472 | current_class_stack[current_class_depth].name = current_class_name; | |
5473 | current_class_stack[current_class_depth].type = current_class_type; | |
5474 | current_class_stack[current_class_depth].access = current_access_specifier; | |
8f032717 | 5475 | current_class_stack[current_class_depth].names_used = 0; |
61a127b3 MM |
5476 | current_class_depth++; |
5477 | ||
5478 | /* Now set up the new type. */ | |
8d08fdba MS |
5479 | current_class_name = TYPE_NAME (type); |
5480 | if (TREE_CODE (current_class_name) == TYPE_DECL) | |
5481 | current_class_name = DECL_NAME (current_class_name); | |
5482 | current_class_type = type; | |
5483 | ||
61a127b3 MM |
5484 | /* By default, things in classes are private, while things in |
5485 | structures or unions are public. */ | |
5486 | current_access_specifier = (CLASSTYPE_DECLARED_CLASS (type) | |
5487 | ? access_private_node | |
5488 | : access_public_node); | |
5489 | ||
8d08fdba | 5490 | if (previous_class_type != NULL_TREE |
8f032717 | 5491 | && (type != previous_class_type |
d0f062fb | 5492 | || !COMPLETE_TYPE_P (previous_class_type)) |
8d08fdba MS |
5493 | && current_class_depth == 1) |
5494 | { | |
5495 | /* Forcibly remove any old class remnants. */ | |
8f032717 | 5496 | invalidate_class_lookup_cache (); |
8d08fdba MS |
5497 | } |
5498 | ||
8f032717 MM |
5499 | /* If we're about to enter a nested class, clear |
5500 | IDENTIFIER_CLASS_VALUE for the enclosing classes. */ | |
29370796 | 5501 | if (current_class_depth > 1) |
8f032717 MM |
5502 | clear_identifier_class_values (); |
5503 | ||
8d08fdba MS |
5504 | pushlevel_class (); |
5505 | ||
29370796 | 5506 | if (type != previous_class_type || current_class_depth > 1) |
fd9aef9d NS |
5507 | { |
5508 | push_class_decls (type); | |
1f845b30 | 5509 | if (CLASSTYPE_TEMPLATE_INFO (type) && !CLASSTYPE_USE_TEMPLATE (type)) |
fd9aef9d | 5510 | { |
1f845b30 | 5511 | /* If we are entering the scope of a template declaration (not a |
fd9aef9d NS |
5512 | specialization), we need to push all the using decls with |
5513 | dependent scope too. */ | |
5514 | tree fields; | |
5515 | ||
5516 | for (fields = TYPE_FIELDS (type); | |
5517 | fields; fields = TREE_CHAIN (fields)) | |
5518 | if (TREE_CODE (fields) == USING_DECL && !TREE_TYPE (fields)) | |
5519 | pushdecl_class_level (fields); | |
5520 | } | |
5521 | } | |
29370796 | 5522 | else |
8d08fdba | 5523 | { |
29370796 NS |
5524 | tree item; |
5525 | ||
5526 | /* We are re-entering the same class we just left, so we don't | |
5527 | have to search the whole inheritance matrix to find all the | |
5528 | decls to bind again. Instead, we install the cached | |
5529 | class_shadowed list, and walk through it binding names and | |
5530 | setting up IDENTIFIER_TYPE_VALUEs. */ | |
5531 | set_class_shadows (previous_class_values); | |
5532 | for (item = previous_class_values; item; item = TREE_CHAIN (item)) | |
8d08fdba | 5533 | { |
29370796 NS |
5534 | tree id = TREE_PURPOSE (item); |
5535 | tree decl = TREE_TYPE (item); | |
5536 | ||
5537 | push_class_binding (id, decl); | |
5538 | if (TREE_CODE (decl) == TYPE_DECL) | |
4b0d3cbe | 5539 | set_identifier_type_value (id, decl); |
8d08fdba | 5540 | } |
29370796 | 5541 | unuse_fields (type); |
8f032717 | 5542 | } |
29370796 NS |
5543 | |
5544 | cxx_remember_type_decls (CLASSTYPE_NESTED_UTDS (type)); | |
8f032717 MM |
5545 | } |
5546 | ||
5547 | /* When we exit a toplevel class scope, we save the | |
5548 | IDENTIFIER_CLASS_VALUEs so that we can restore them quickly if we | |
5549 | reenter the class. Here, we've entered some other class, so we | |
5550 | must invalidate our cache. */ | |
8d08fdba | 5551 | |
8f032717 | 5552 | void |
94edc4ab | 5553 | invalidate_class_lookup_cache (void) |
8f032717 | 5554 | { |
8f032717 MM |
5555 | tree t; |
5556 | ||
4890c2f4 | 5557 | /* The IDENTIFIER_CLASS_VALUEs are no longer valid. */ |
8f032717 MM |
5558 | for (t = previous_class_values; t; t = TREE_CHAIN (t)) |
5559 | IDENTIFIER_CLASS_VALUE (TREE_PURPOSE (t)) = NULL_TREE; | |
4890c2f4 MM |
5560 | |
5561 | previous_class_values = NULL_TREE; | |
8f032717 | 5562 | previous_class_type = NULL_TREE; |
8d08fdba MS |
5563 | } |
5564 | ||
5565 | /* Get out of the current class scope. If we were in a class scope | |
b74a0560 | 5566 | previously, that is the one popped to. */ |
e92cc029 | 5567 | |
8d08fdba | 5568 | void |
94edc4ab | 5569 | popclass (void) |
8d08fdba | 5570 | { |
273a708f | 5571 | poplevel_class (); |
b74a0560 | 5572 | pop_class_decls (); |
8d08fdba MS |
5573 | |
5574 | current_class_depth--; | |
61a127b3 MM |
5575 | current_class_name = current_class_stack[current_class_depth].name; |
5576 | current_class_type = current_class_stack[current_class_depth].type; | |
5577 | current_access_specifier = current_class_stack[current_class_depth].access; | |
8f032717 MM |
5578 | if (current_class_stack[current_class_depth].names_used) |
5579 | splay_tree_delete (current_class_stack[current_class_depth].names_used); | |
8d08fdba MS |
5580 | } |
5581 | ||
70adf8a9 JM |
5582 | /* Returns 1 if current_class_type is either T or a nested type of T. |
5583 | We start looking from 1 because entry 0 is from global scope, and has | |
5584 | no type. */ | |
b9082e8a JM |
5585 | |
5586 | int | |
94edc4ab | 5587 | currently_open_class (tree t) |
b9082e8a JM |
5588 | { |
5589 | int i; | |
14d22dd6 | 5590 | if (current_class_type && same_type_p (t, current_class_type)) |
b9082e8a | 5591 | return 1; |
70adf8a9 | 5592 | for (i = 1; i < current_class_depth; ++i) |
14d22dd6 MM |
5593 | if (current_class_stack[i].type |
5594 | && same_type_p (current_class_stack [i].type, t)) | |
b9082e8a JM |
5595 | return 1; |
5596 | return 0; | |
5597 | } | |
5598 | ||
70adf8a9 JM |
5599 | /* If either current_class_type or one of its enclosing classes are derived |
5600 | from T, return the appropriate type. Used to determine how we found | |
5601 | something via unqualified lookup. */ | |
5602 | ||
5603 | tree | |
94edc4ab | 5604 | currently_open_derived_class (tree t) |
70adf8a9 JM |
5605 | { |
5606 | int i; | |
5607 | ||
9bcb9aae | 5608 | /* The bases of a dependent type are unknown. */ |
1fb3244a MM |
5609 | if (dependent_type_p (t)) |
5610 | return NULL_TREE; | |
5611 | ||
c44e68a5 KL |
5612 | if (!current_class_type) |
5613 | return NULL_TREE; | |
5614 | ||
70adf8a9 JM |
5615 | if (DERIVED_FROM_P (t, current_class_type)) |
5616 | return current_class_type; | |
5617 | ||
5618 | for (i = current_class_depth - 1; i > 0; --i) | |
5619 | if (DERIVED_FROM_P (t, current_class_stack[i].type)) | |
5620 | return current_class_stack[i].type; | |
5621 | ||
5622 | return NULL_TREE; | |
5623 | } | |
5624 | ||
8d08fdba | 5625 | /* When entering a class scope, all enclosing class scopes' names with |
14d22dd6 MM |
5626 | static meaning (static variables, static functions, types and |
5627 | enumerators) have to be visible. This recursive function calls | |
5628 | pushclass for all enclosing class contexts until global or a local | |
5629 | scope is reached. TYPE is the enclosed class. */ | |
8d08fdba MS |
5630 | |
5631 | void | |
14d22dd6 | 5632 | push_nested_class (tree type) |
8d08fdba | 5633 | { |
a28e3c7f MS |
5634 | tree context; |
5635 | ||
b262d64c | 5636 | /* A namespace might be passed in error cases, like A::B:C. */ |
07c88314 MM |
5637 | if (type == NULL_TREE |
5638 | || type == error_mark_node | |
b262d64c | 5639 | || TREE_CODE (type) == NAMESPACE_DECL |
07c88314 | 5640 | || ! IS_AGGR_TYPE (type) |
73b0fce8 | 5641 | || TREE_CODE (type) == TEMPLATE_TYPE_PARM |
a1281f45 | 5642 | || TREE_CODE (type) == BOUND_TEMPLATE_TEMPLATE_PARM) |
a28e3c7f MS |
5643 | return; |
5644 | ||
d2e5ee5c | 5645 | context = DECL_CONTEXT (TYPE_MAIN_DECL (type)); |
8d08fdba | 5646 | |
6b400b21 | 5647 | if (context && CLASS_TYPE_P (context)) |
14d22dd6 | 5648 | push_nested_class (context); |
29370796 | 5649 | pushclass (type); |
8d08fdba MS |
5650 | } |
5651 | ||
a723baf1 | 5652 | /* Undoes a push_nested_class call. */ |
8d08fdba MS |
5653 | |
5654 | void | |
94edc4ab | 5655 | pop_nested_class (void) |
8d08fdba | 5656 | { |
d2e5ee5c | 5657 | tree context = DECL_CONTEXT (TYPE_MAIN_DECL (current_class_type)); |
8d08fdba | 5658 | |
b74a0560 | 5659 | popclass (); |
6b400b21 | 5660 | if (context && CLASS_TYPE_P (context)) |
b74a0560 | 5661 | pop_nested_class (); |
8d08fdba MS |
5662 | } |
5663 | ||
46ccf50a JM |
5664 | /* Returns the number of extern "LANG" blocks we are nested within. */ |
5665 | ||
5666 | int | |
94edc4ab | 5667 | current_lang_depth (void) |
46ccf50a JM |
5668 | { |
5669 | return VARRAY_ACTIVE_SIZE (current_lang_base); | |
5670 | } | |
5671 | ||
8d08fdba MS |
5672 | /* Set global variables CURRENT_LANG_NAME to appropriate value |
5673 | so that behavior of name-mangling machinery is correct. */ | |
5674 | ||
5675 | void | |
94edc4ab | 5676 | push_lang_context (tree name) |
8d08fdba | 5677 | { |
46ccf50a | 5678 | VARRAY_PUSH_TREE (current_lang_base, current_lang_name); |
8d08fdba | 5679 | |
e229f2cd | 5680 | if (name == lang_name_cplusplus) |
8d08fdba | 5681 | { |
8d08fdba MS |
5682 | current_lang_name = name; |
5683 | } | |
e229f2cd PB |
5684 | else if (name == lang_name_java) |
5685 | { | |
e229f2cd PB |
5686 | current_lang_name = name; |
5687 | /* DECL_IGNORED_P is initially set for these types, to avoid clutter. | |
5688 | (See record_builtin_java_type in decl.c.) However, that causes | |
5689 | incorrect debug entries if these types are actually used. | |
00a17e31 | 5690 | So we re-enable debug output after extern "Java". */ |
e3cd9945 APB |
5691 | DECL_IGNORED_P (TYPE_NAME (java_byte_type_node)) = 0; |
5692 | DECL_IGNORED_P (TYPE_NAME (java_short_type_node)) = 0; | |
5693 | DECL_IGNORED_P (TYPE_NAME (java_int_type_node)) = 0; | |
5694 | DECL_IGNORED_P (TYPE_NAME (java_long_type_node)) = 0; | |
5695 | DECL_IGNORED_P (TYPE_NAME (java_float_type_node)) = 0; | |
5696 | DECL_IGNORED_P (TYPE_NAME (java_double_type_node)) = 0; | |
5697 | DECL_IGNORED_P (TYPE_NAME (java_char_type_node)) = 0; | |
5698 | DECL_IGNORED_P (TYPE_NAME (java_boolean_type_node)) = 0; | |
e229f2cd | 5699 | } |
8d08fdba MS |
5700 | else if (name == lang_name_c) |
5701 | { | |
8d08fdba MS |
5702 | current_lang_name = name; |
5703 | } | |
5704 | else | |
8251199e | 5705 | error ("language string `\"%s\"' not recognized", IDENTIFIER_POINTER (name)); |
8d08fdba MS |
5706 | } |
5707 | ||
5708 | /* Get out of the current language scope. */ | |
e92cc029 | 5709 | |
8d08fdba | 5710 | void |
94edc4ab | 5711 | pop_lang_context (void) |
8d08fdba | 5712 | { |
46ccf50a JM |
5713 | current_lang_name = VARRAY_TOP_TREE (current_lang_base); |
5714 | VARRAY_POP (current_lang_base); | |
8d08fdba | 5715 | } |
8d08fdba MS |
5716 | \f |
5717 | /* Type instantiation routines. */ | |
5718 | ||
104bf76a MM |
5719 | /* Given an OVERLOAD and a TARGET_TYPE, return the function that |
5720 | matches the TARGET_TYPE. If there is no satisfactory match, return | |
92af500d NS |
5721 | error_mark_node, and issue a error & warning messages under control |
5722 | of FLAGS. Permit pointers to member function if FLAGS permits. If | |
5723 | TEMPLATE_ONLY, the name of the overloaded function was a | |
5724 | template-id, and EXPLICIT_TARGS are the explicitly provided | |
104bf76a MM |
5725 | template arguments. */ |
5726 | ||
2c73f9f5 | 5727 | static tree |
94edc4ab NN |
5728 | resolve_address_of_overloaded_function (tree target_type, |
5729 | tree overload, | |
92af500d NS |
5730 | tsubst_flags_t flags, |
5731 | bool template_only, | |
94edc4ab | 5732 | tree explicit_targs) |
2c73f9f5 | 5733 | { |
104bf76a MM |
5734 | /* Here's what the standard says: |
5735 | ||
5736 | [over.over] | |
5737 | ||
5738 | If the name is a function template, template argument deduction | |
5739 | is done, and if the argument deduction succeeds, the deduced | |
5740 | arguments are used to generate a single template function, which | |
5741 | is added to the set of overloaded functions considered. | |
5742 | ||
5743 | Non-member functions and static member functions match targets of | |
5744 | type "pointer-to-function" or "reference-to-function." Nonstatic | |
5745 | member functions match targets of type "pointer-to-member | |
5746 | function;" the function type of the pointer to member is used to | |
5747 | select the member function from the set of overloaded member | |
5748 | functions. If a nonstatic member function is selected, the | |
5749 | reference to the overloaded function name is required to have the | |
5750 | form of a pointer to member as described in 5.3.1. | |
5751 | ||
5752 | If more than one function is selected, any template functions in | |
5753 | the set are eliminated if the set also contains a non-template | |
5754 | function, and any given template function is eliminated if the | |
5755 | set contains a second template function that is more specialized | |
5756 | than the first according to the partial ordering rules 14.5.5.2. | |
5757 | After such eliminations, if any, there shall remain exactly one | |
5758 | selected function. */ | |
5759 | ||
5760 | int is_ptrmem = 0; | |
5761 | int is_reference = 0; | |
5762 | /* We store the matches in a TREE_LIST rooted here. The functions | |
5763 | are the TREE_PURPOSE, not the TREE_VALUE, in this list, for easy | |
5764 | interoperability with most_specialized_instantiation. */ | |
5765 | tree matches = NULL_TREE; | |
50714e79 | 5766 | tree fn; |
104bf76a | 5767 | |
d8f8dca1 MM |
5768 | /* By the time we get here, we should be seeing only real |
5769 | pointer-to-member types, not the internal POINTER_TYPE to | |
5770 | METHOD_TYPE representation. */ | |
5771 | my_friendly_assert (!(TREE_CODE (target_type) == POINTER_TYPE | |
5772 | && (TREE_CODE (TREE_TYPE (target_type)) | |
5773 | == METHOD_TYPE)), 0); | |
104bf76a | 5774 | |
92af500d NS |
5775 | my_friendly_assert (is_overloaded_fn (overload), 20030910); |
5776 | ||
104bf76a MM |
5777 | /* Check that the TARGET_TYPE is reasonable. */ |
5778 | if (TYPE_PTRFN_P (target_type)) | |
381ddaa6 | 5779 | /* This is OK. */; |
104bf76a MM |
5780 | else if (TYPE_PTRMEMFUNC_P (target_type)) |
5781 | /* This is OK, too. */ | |
5782 | is_ptrmem = 1; | |
5783 | else if (TREE_CODE (target_type) == FUNCTION_TYPE) | |
5784 | { | |
5785 | /* This is OK, too. This comes from a conversion to reference | |
5786 | type. */ | |
5787 | target_type = build_reference_type (target_type); | |
5788 | is_reference = 1; | |
5789 | } | |
5790 | else | |
5791 | { | |
92af500d | 5792 | if (flags & tf_error) |
33bd39a2 | 5793 | error ("\ |
381ddaa6 JM |
5794 | cannot resolve overloaded function `%D' based on conversion to type `%T'", |
5795 | DECL_NAME (OVL_FUNCTION (overload)), target_type); | |
104bf76a MM |
5796 | return error_mark_node; |
5797 | } | |
5798 | ||
5799 | /* If we can find a non-template function that matches, we can just | |
5800 | use it. There's no point in generating template instantiations | |
5801 | if we're just going to throw them out anyhow. But, of course, we | |
5802 | can only do this when we don't *need* a template function. */ | |
5803 | if (!template_only) | |
5804 | { | |
5805 | tree fns; | |
5806 | ||
a723baf1 | 5807 | for (fns = overload; fns; fns = OVL_NEXT (fns)) |
104bf76a | 5808 | { |
a723baf1 | 5809 | tree fn = OVL_CURRENT (fns); |
104bf76a | 5810 | tree fntype; |
2c73f9f5 | 5811 | |
104bf76a MM |
5812 | if (TREE_CODE (fn) == TEMPLATE_DECL) |
5813 | /* We're not looking for templates just yet. */ | |
5814 | continue; | |
5815 | ||
5816 | if ((TREE_CODE (TREE_TYPE (fn)) == METHOD_TYPE) | |
5817 | != is_ptrmem) | |
5818 | /* We're looking for a non-static member, and this isn't | |
5819 | one, or vice versa. */ | |
5820 | continue; | |
34ff2673 RS |
5821 | |
5822 | /* Ignore anticipated decls of undeclared builtins. */ | |
5823 | if (DECL_ANTICIPATED (fn)) | |
5824 | continue; | |
5825 | ||
104bf76a MM |
5826 | /* See if there's a match. */ |
5827 | fntype = TREE_TYPE (fn); | |
5828 | if (is_ptrmem) | |
5829 | fntype = build_ptrmemfunc_type (build_pointer_type (fntype)); | |
5830 | else if (!is_reference) | |
5831 | fntype = build_pointer_type (fntype); | |
5832 | ||
5833 | if (can_convert_arg (target_type, fntype, fn)) | |
e1b3e07d | 5834 | matches = tree_cons (fn, NULL_TREE, matches); |
104bf76a MM |
5835 | } |
5836 | } | |
5837 | ||
5838 | /* Now, if we've already got a match (or matches), there's no need | |
5839 | to proceed to the template functions. But, if we don't have a | |
5840 | match we need to look at them, too. */ | |
5841 | if (!matches) | |
2c73f9f5 | 5842 | { |
104bf76a MM |
5843 | tree target_fn_type; |
5844 | tree target_arg_types; | |
8d3631f8 | 5845 | tree target_ret_type; |
104bf76a MM |
5846 | tree fns; |
5847 | ||
5848 | if (is_ptrmem) | |
4393e105 MM |
5849 | target_fn_type |
5850 | = TREE_TYPE (TYPE_PTRMEMFUNC_FN_TYPE (target_type)); | |
2c73f9f5 | 5851 | else |
4393e105 MM |
5852 | target_fn_type = TREE_TYPE (target_type); |
5853 | target_arg_types = TYPE_ARG_TYPES (target_fn_type); | |
8d3631f8 | 5854 | target_ret_type = TREE_TYPE (target_fn_type); |
e5214479 JM |
5855 | |
5856 | /* Never do unification on the 'this' parameter. */ | |
5857 | if (TREE_CODE (target_fn_type) == METHOD_TYPE) | |
5858 | target_arg_types = TREE_CHAIN (target_arg_types); | |
4393e105 | 5859 | |
a723baf1 | 5860 | for (fns = overload; fns; fns = OVL_NEXT (fns)) |
104bf76a | 5861 | { |
a723baf1 | 5862 | tree fn = OVL_CURRENT (fns); |
104bf76a MM |
5863 | tree instantiation; |
5864 | tree instantiation_type; | |
5865 | tree targs; | |
5866 | ||
5867 | if (TREE_CODE (fn) != TEMPLATE_DECL) | |
5868 | /* We're only looking for templates. */ | |
5869 | continue; | |
5870 | ||
5871 | if ((TREE_CODE (TREE_TYPE (fn)) == METHOD_TYPE) | |
5872 | != is_ptrmem) | |
4393e105 | 5873 | /* We're not looking for a non-static member, and this is |
104bf76a MM |
5874 | one, or vice versa. */ |
5875 | continue; | |
5876 | ||
104bf76a | 5877 | /* Try to do argument deduction. */ |
f31c0a32 | 5878 | targs = make_tree_vec (DECL_NTPARMS (fn)); |
4393e105 | 5879 | if (fn_type_unification (fn, explicit_targs, targs, |
8d3631f8 | 5880 | target_arg_types, target_ret_type, |
e5214479 | 5881 | DEDUCE_EXACT, -1) != 0) |
104bf76a MM |
5882 | /* Argument deduction failed. */ |
5883 | continue; | |
5884 | ||
5885 | /* Instantiate the template. */ | |
92af500d | 5886 | instantiation = instantiate_template (fn, targs, flags); |
104bf76a MM |
5887 | if (instantiation == error_mark_node) |
5888 | /* Instantiation failed. */ | |
5889 | continue; | |
5890 | ||
5891 | /* See if there's a match. */ | |
5892 | instantiation_type = TREE_TYPE (instantiation); | |
5893 | if (is_ptrmem) | |
5894 | instantiation_type = | |
5895 | build_ptrmemfunc_type (build_pointer_type (instantiation_type)); | |
5896 | else if (!is_reference) | |
5897 | instantiation_type = build_pointer_type (instantiation_type); | |
5898 | if (can_convert_arg (target_type, instantiation_type, instantiation)) | |
e1b3e07d | 5899 | matches = tree_cons (instantiation, fn, matches); |
104bf76a MM |
5900 | } |
5901 | ||
5902 | /* Now, remove all but the most specialized of the matches. */ | |
5903 | if (matches) | |
5904 | { | |
e5214479 | 5905 | tree match = most_specialized_instantiation (matches); |
104bf76a MM |
5906 | |
5907 | if (match != error_mark_node) | |
e1b3e07d | 5908 | matches = tree_cons (match, NULL_TREE, NULL_TREE); |
104bf76a MM |
5909 | } |
5910 | } | |
5911 | ||
5912 | /* Now we should have exactly one function in MATCHES. */ | |
5913 | if (matches == NULL_TREE) | |
5914 | { | |
5915 | /* There were *no* matches. */ | |
92af500d | 5916 | if (flags & tf_error) |
104bf76a | 5917 | { |
33bd39a2 | 5918 | error ("no matches converting function `%D' to type `%#T'", |
104bf76a MM |
5919 | DECL_NAME (OVL_FUNCTION (overload)), |
5920 | target_type); | |
6b9b6b15 JM |
5921 | |
5922 | /* print_candidates expects a chain with the functions in | |
5923 | TREE_VALUE slots, so we cons one up here (we're losing anyway, | |
5924 | so why be clever?). */ | |
5925 | for (; overload; overload = OVL_NEXT (overload)) | |
e1b3e07d MM |
5926 | matches = tree_cons (NULL_TREE, OVL_CURRENT (overload), |
5927 | matches); | |
6b9b6b15 JM |
5928 | |
5929 | print_candidates (matches); | |
104bf76a MM |
5930 | } |
5931 | return error_mark_node; | |
2c73f9f5 | 5932 | } |
104bf76a MM |
5933 | else if (TREE_CHAIN (matches)) |
5934 | { | |
5935 | /* There were too many matches. */ | |
5936 | ||
92af500d | 5937 | if (flags & tf_error) |
104bf76a MM |
5938 | { |
5939 | tree match; | |
5940 | ||
33bd39a2 | 5941 | error ("converting overloaded function `%D' to type `%#T' is ambiguous", |
104bf76a MM |
5942 | DECL_NAME (OVL_FUNCTION (overload)), |
5943 | target_type); | |
5944 | ||
5945 | /* Since print_candidates expects the functions in the | |
5946 | TREE_VALUE slot, we flip them here. */ | |
5947 | for (match = matches; match; match = TREE_CHAIN (match)) | |
5948 | TREE_VALUE (match) = TREE_PURPOSE (match); | |
5949 | ||
5950 | print_candidates (matches); | |
5951 | } | |
5952 | ||
5953 | return error_mark_node; | |
5954 | } | |
5955 | ||
50714e79 MM |
5956 | /* Good, exactly one match. Now, convert it to the correct type. */ |
5957 | fn = TREE_PURPOSE (matches); | |
5958 | ||
b1ce3eb2 | 5959 | if (DECL_NONSTATIC_MEMBER_FUNCTION_P (fn) |
92af500d | 5960 | && !(flags & tf_ptrmem_ok) && !flag_ms_extensions) |
19420d00 | 5961 | { |
b1ce3eb2 NS |
5962 | static int explained; |
5963 | ||
92af500d | 5964 | if (!(flags & tf_error)) |
19420d00 NS |
5965 | return error_mark_node; |
5966 | ||
33bd39a2 | 5967 | pedwarn ("assuming pointer to member `%D'", fn); |
b1ce3eb2 NS |
5968 | if (!explained) |
5969 | { | |
33bd39a2 | 5970 | pedwarn ("(a pointer to member can only be formed with `&%E')", fn); |
b1ce3eb2 NS |
5971 | explained = 1; |
5972 | } | |
19420d00 | 5973 | } |
84583208 MM |
5974 | |
5975 | /* If we're doing overload resolution purely for the purpose of | |
5976 | determining conversion sequences, we should not consider the | |
5977 | function used. If this conversion sequence is selected, the | |
5978 | function will be marked as used at this point. */ | |
5979 | if (!(flags & tf_conv)) | |
5980 | mark_used (fn); | |
a6ecf8b6 | 5981 | |
50714e79 MM |
5982 | if (TYPE_PTRFN_P (target_type) || TYPE_PTRMEMFUNC_P (target_type)) |
5983 | return build_unary_op (ADDR_EXPR, fn, 0); | |
5984 | else | |
5985 | { | |
5986 | /* The target must be a REFERENCE_TYPE. Above, build_unary_op | |
5987 | will mark the function as addressed, but here we must do it | |
5988 | explicitly. */ | |
dffd7eb6 | 5989 | cxx_mark_addressable (fn); |
50714e79 MM |
5990 | |
5991 | return fn; | |
5992 | } | |
2c73f9f5 ML |
5993 | } |
5994 | ||
ec255269 MS |
5995 | /* This function will instantiate the type of the expression given in |
5996 | RHS to match the type of LHSTYPE. If errors exist, then return | |
92af500d | 5997 | error_mark_node. FLAGS is a bit mask. If TF_ERROR is set, then |
5e76004e NS |
5998 | we complain on errors. If we are not complaining, never modify rhs, |
5999 | as overload resolution wants to try many possible instantiations, in | |
6000 | the hope that at least one will work. | |
6001 | ||
e6e174e5 JM |
6002 | For non-recursive calls, LHSTYPE should be a function, pointer to |
6003 | function, or a pointer to member function. */ | |
e92cc029 | 6004 | |
8d08fdba | 6005 | tree |
94edc4ab | 6006 | instantiate_type (tree lhstype, tree rhs, tsubst_flags_t flags) |
8d08fdba | 6007 | { |
92af500d | 6008 | tsubst_flags_t flags_in = flags; |
19420d00 | 6009 | |
c2ea3a40 | 6010 | flags &= ~tf_ptrmem_ok; |
105d8e1f | 6011 | |
8d08fdba MS |
6012 | if (TREE_CODE (lhstype) == UNKNOWN_TYPE) |
6013 | { | |
92af500d | 6014 | if (flags & tf_error) |
8251199e | 6015 | error ("not enough type information"); |
8d08fdba MS |
6016 | return error_mark_node; |
6017 | } | |
6018 | ||
6019 | if (TREE_TYPE (rhs) != NULL_TREE && ! (type_unknown_p (rhs))) | |
abff8e06 | 6020 | { |
8f4b394d | 6021 | if (same_type_p (lhstype, TREE_TYPE (rhs))) |
abff8e06 | 6022 | return rhs; |
a723baf1 MM |
6023 | if (flag_ms_extensions |
6024 | && TYPE_PTRMEMFUNC_P (lhstype) | |
6025 | && !TYPE_PTRMEMFUNC_P (TREE_TYPE (rhs))) | |
6026 | /* Microsoft allows `A::f' to be resolved to a | |
6027 | pointer-to-member. */ | |
6028 | ; | |
6029 | else | |
6030 | { | |
92af500d | 6031 | if (flags & tf_error) |
a723baf1 MM |
6032 | error ("argument of type `%T' does not match `%T'", |
6033 | TREE_TYPE (rhs), lhstype); | |
6034 | return error_mark_node; | |
6035 | } | |
abff8e06 | 6036 | } |
8d08fdba | 6037 | |
50ad9642 MM |
6038 | if (TREE_CODE (rhs) == BASELINK) |
6039 | rhs = BASELINK_FUNCTIONS (rhs); | |
6040 | ||
2c73f9f5 ML |
6041 | /* We don't overwrite rhs if it is an overloaded function. |
6042 | Copying it would destroy the tree link. */ | |
6043 | if (TREE_CODE (rhs) != OVERLOAD) | |
6044 | rhs = copy_node (rhs); | |
c73964b2 | 6045 | |
8d08fdba MS |
6046 | /* This should really only be used when attempting to distinguish |
6047 | what sort of a pointer to function we have. For now, any | |
6048 | arithmetic operation which is not supported on pointers | |
6049 | is rejected as an error. */ | |
6050 | ||
6051 | switch (TREE_CODE (rhs)) | |
6052 | { | |
6053 | case TYPE_EXPR: | |
6054 | case CONVERT_EXPR: | |
6055 | case SAVE_EXPR: | |
6056 | case CONSTRUCTOR: | |
6057 | case BUFFER_REF: | |
a98facb0 | 6058 | abort (); |
8d08fdba MS |
6059 | return error_mark_node; |
6060 | ||
6061 | case INDIRECT_REF: | |
6062 | case ARRAY_REF: | |
ec255269 MS |
6063 | { |
6064 | tree new_rhs; | |
8d08fdba | 6065 | |
ec255269 | 6066 | new_rhs = instantiate_type (build_pointer_type (lhstype), |
940ff223 | 6067 | TREE_OPERAND (rhs, 0), flags); |
ec255269 MS |
6068 | if (new_rhs == error_mark_node) |
6069 | return error_mark_node; | |
6070 | ||
6071 | TREE_TYPE (rhs) = lhstype; | |
6072 | TREE_OPERAND (rhs, 0) = new_rhs; | |
6073 | return rhs; | |
6074 | } | |
8d08fdba MS |
6075 | |
6076 | case NOP_EXPR: | |
6077 | rhs = copy_node (TREE_OPERAND (rhs, 0)); | |
6078 | TREE_TYPE (rhs) = unknown_type_node; | |
940ff223 | 6079 | return instantiate_type (lhstype, rhs, flags); |
8d08fdba MS |
6080 | |
6081 | case COMPONENT_REF: | |
92af500d NS |
6082 | { |
6083 | tree addr = instantiate_type (lhstype, TREE_OPERAND (rhs, 1), flags); | |
6084 | ||
6085 | if (addr != error_mark_node | |
6086 | && TREE_SIDE_EFFECTS (TREE_OPERAND (rhs, 0))) | |
04c06002 | 6087 | /* Do not lose object's side effects. */ |
92af500d NS |
6088 | addr = build (COMPOUND_EXPR, TREE_TYPE (addr), |
6089 | TREE_OPERAND (rhs, 0), addr); | |
6090 | return addr; | |
6091 | } | |
8d08fdba | 6092 | |
2a238a97 | 6093 | case OFFSET_REF: |
05e0b2f4 JM |
6094 | rhs = TREE_OPERAND (rhs, 1); |
6095 | if (BASELINK_P (rhs)) | |
92af500d | 6096 | return instantiate_type (lhstype, BASELINK_FUNCTIONS (rhs), flags_in); |
05e0b2f4 | 6097 | |
2a238a97 MM |
6098 | /* This can happen if we are forming a pointer-to-member for a |
6099 | member template. */ | |
2a238a97 | 6100 | my_friendly_assert (TREE_CODE (rhs) == TEMPLATE_ID_EXPR, 0); |
05e0b2f4 | 6101 | |
2a238a97 | 6102 | /* Fall through. */ |
874503bc | 6103 | |
386b8a85 | 6104 | case TEMPLATE_ID_EXPR: |
2bdb0643 JM |
6105 | { |
6106 | tree fns = TREE_OPERAND (rhs, 0); | |
6107 | tree args = TREE_OPERAND (rhs, 1); | |
6108 | ||
19420d00 | 6109 | return |
92af500d NS |
6110 | resolve_address_of_overloaded_function (lhstype, fns, flags_in, |
6111 | /*template_only=*/true, | |
2bdb0643 | 6112 | args); |
2bdb0643 | 6113 | } |
386b8a85 | 6114 | |
2c73f9f5 | 6115 | case OVERLOAD: |
a723baf1 | 6116 | case FUNCTION_DECL: |
104bf76a | 6117 | return |
92af500d NS |
6118 | resolve_address_of_overloaded_function (lhstype, rhs, flags_in, |
6119 | /*template_only=*/false, | |
104bf76a | 6120 | /*explicit_targs=*/NULL_TREE); |
2c73f9f5 ML |
6121 | |
6122 | case TREE_LIST: | |
00a17e31 | 6123 | /* Now we should have a baselink. */ |
940ff223 | 6124 | my_friendly_assert (BASELINK_P (rhs), 990412); |
e5966228 | 6125 | |
da15dae6 | 6126 | return instantiate_type (lhstype, BASELINK_FUNCTIONS (rhs), flags); |
8d08fdba MS |
6127 | |
6128 | case CALL_EXPR: | |
6129 | /* This is too hard for now. */ | |
a98facb0 | 6130 | abort (); |
8d08fdba MS |
6131 | return error_mark_node; |
6132 | ||
6133 | case PLUS_EXPR: | |
6134 | case MINUS_EXPR: | |
6135 | case COMPOUND_EXPR: | |
a0a33927 | 6136 | TREE_OPERAND (rhs, 0) |
940ff223 | 6137 | = instantiate_type (lhstype, TREE_OPERAND (rhs, 0), flags); |
8d08fdba MS |
6138 | if (TREE_OPERAND (rhs, 0) == error_mark_node) |
6139 | return error_mark_node; | |
a0a33927 | 6140 | TREE_OPERAND (rhs, 1) |
940ff223 | 6141 | = instantiate_type (lhstype, TREE_OPERAND (rhs, 1), flags); |
8d08fdba MS |
6142 | if (TREE_OPERAND (rhs, 1) == error_mark_node) |
6143 | return error_mark_node; | |
6144 | ||
6145 | TREE_TYPE (rhs) = lhstype; | |
6146 | return rhs; | |
6147 | ||
6148 | case MULT_EXPR: | |
6149 | case TRUNC_DIV_EXPR: | |
6150 | case FLOOR_DIV_EXPR: | |
6151 | case CEIL_DIV_EXPR: | |
6152 | case ROUND_DIV_EXPR: | |
6153 | case RDIV_EXPR: | |
6154 | case TRUNC_MOD_EXPR: | |
6155 | case FLOOR_MOD_EXPR: | |
6156 | case CEIL_MOD_EXPR: | |
6157 | case ROUND_MOD_EXPR: | |
6158 | case FIX_ROUND_EXPR: | |
6159 | case FIX_FLOOR_EXPR: | |
6160 | case FIX_CEIL_EXPR: | |
6161 | case FIX_TRUNC_EXPR: | |
6162 | case FLOAT_EXPR: | |
6163 | case NEGATE_EXPR: | |
6164 | case ABS_EXPR: | |
6165 | case MAX_EXPR: | |
6166 | case MIN_EXPR: | |
8d08fdba MS |
6167 | |
6168 | case BIT_AND_EXPR: | |
6169 | case BIT_IOR_EXPR: | |
6170 | case BIT_XOR_EXPR: | |
6171 | case LSHIFT_EXPR: | |
6172 | case RSHIFT_EXPR: | |
6173 | case LROTATE_EXPR: | |
6174 | case RROTATE_EXPR: | |
6175 | ||
6176 | case PREINCREMENT_EXPR: | |
6177 | case PREDECREMENT_EXPR: | |
6178 | case POSTINCREMENT_EXPR: | |
6179 | case POSTDECREMENT_EXPR: | |
92af500d | 6180 | if (flags & tf_error) |
8251199e | 6181 | error ("invalid operation on uninstantiated type"); |
8d08fdba MS |
6182 | return error_mark_node; |
6183 | ||
6184 | case TRUTH_AND_EXPR: | |
6185 | case TRUTH_OR_EXPR: | |
6186 | case TRUTH_XOR_EXPR: | |
6187 | case LT_EXPR: | |
6188 | case LE_EXPR: | |
6189 | case GT_EXPR: | |
6190 | case GE_EXPR: | |
6191 | case EQ_EXPR: | |
6192 | case NE_EXPR: | |
6193 | case TRUTH_ANDIF_EXPR: | |
6194 | case TRUTH_ORIF_EXPR: | |
6195 | case TRUTH_NOT_EXPR: | |
92af500d | 6196 | if (flags & tf_error) |
8251199e | 6197 | error ("not enough type information"); |
8d08fdba MS |
6198 | return error_mark_node; |
6199 | ||
ca36f057 MM |
6200 | case COND_EXPR: |
6201 | if (type_unknown_p (TREE_OPERAND (rhs, 0))) | |
6202 | { | |
92af500d | 6203 | if (flags & tf_error) |
ca36f057 MM |
6204 | error ("not enough type information"); |
6205 | return error_mark_node; | |
6206 | } | |
6207 | TREE_OPERAND (rhs, 1) | |
6208 | = instantiate_type (lhstype, TREE_OPERAND (rhs, 1), flags); | |
6209 | if (TREE_OPERAND (rhs, 1) == error_mark_node) | |
6210 | return error_mark_node; | |
6211 | TREE_OPERAND (rhs, 2) | |
6212 | = instantiate_type (lhstype, TREE_OPERAND (rhs, 2), flags); | |
6213 | if (TREE_OPERAND (rhs, 2) == error_mark_node) | |
6214 | return error_mark_node; | |
6215 | ||
6216 | TREE_TYPE (rhs) = lhstype; | |
6217 | return rhs; | |
6218 | ||
6219 | case MODIFY_EXPR: | |
6220 | TREE_OPERAND (rhs, 1) | |
6221 | = instantiate_type (lhstype, TREE_OPERAND (rhs, 1), flags); | |
6222 | if (TREE_OPERAND (rhs, 1) == error_mark_node) | |
6223 | return error_mark_node; | |
6224 | ||
6225 | TREE_TYPE (rhs) = lhstype; | |
6226 | return rhs; | |
6227 | ||
6228 | case ADDR_EXPR: | |
19420d00 NS |
6229 | { |
6230 | if (PTRMEM_OK_P (rhs)) | |
c2ea3a40 | 6231 | flags |= tf_ptrmem_ok; |
19420d00 | 6232 | |
ca36f057 | 6233 | return instantiate_type (lhstype, TREE_OPERAND (rhs, 0), flags); |
19420d00 | 6234 | } |
ca36f057 | 6235 | case ENTRY_VALUE_EXPR: |
a98facb0 | 6236 | abort (); |
ca36f057 MM |
6237 | return error_mark_node; |
6238 | ||
6239 | case ERROR_MARK: | |
6240 | return error_mark_node; | |
6241 | ||
6242 | default: | |
a98facb0 | 6243 | abort (); |
ca36f057 MM |
6244 | return error_mark_node; |
6245 | } | |
6246 | } | |
6247 | \f | |
6248 | /* Return the name of the virtual function pointer field | |
6249 | (as an IDENTIFIER_NODE) for the given TYPE. Note that | |
6250 | this may have to look back through base types to find the | |
6251 | ultimate field name. (For single inheritance, these could | |
6252 | all be the same name. Who knows for multiple inheritance). */ | |
6253 | ||
6254 | static tree | |
94edc4ab | 6255 | get_vfield_name (tree type) |
ca36f057 MM |
6256 | { |
6257 | tree binfo = TYPE_BINFO (type); | |
6258 | char *buf; | |
6259 | ||
6260 | while (BINFO_BASETYPES (binfo) | |
6261 | && TYPE_CONTAINS_VPTR_P (BINFO_TYPE (BINFO_BASETYPE (binfo, 0))) | |
6262 | && ! TREE_VIA_VIRTUAL (BINFO_BASETYPE (binfo, 0))) | |
6263 | binfo = BINFO_BASETYPE (binfo, 0); | |
6264 | ||
6265 | type = BINFO_TYPE (binfo); | |
c68b0a84 | 6266 | buf = alloca (sizeof (VFIELD_NAME_FORMAT) + TYPE_NAME_LENGTH (type) + 2); |
ea122333 JM |
6267 | sprintf (buf, VFIELD_NAME_FORMAT, |
6268 | IDENTIFIER_POINTER (constructor_name (type))); | |
ca36f057 MM |
6269 | return get_identifier (buf); |
6270 | } | |
6271 | ||
6272 | void | |
94edc4ab | 6273 | print_class_statistics (void) |
ca36f057 MM |
6274 | { |
6275 | #ifdef GATHER_STATISTICS | |
6276 | fprintf (stderr, "convert_harshness = %d\n", n_convert_harshness); | |
6277 | fprintf (stderr, "compute_conversion_costs = %d\n", n_compute_conversion_costs); | |
6278 | fprintf (stderr, "build_method_call = %d (inner = %d)\n", | |
6279 | n_build_method_call, n_inner_fields_searched); | |
6280 | if (n_vtables) | |
6281 | { | |
6282 | fprintf (stderr, "vtables = %d; vtable searches = %d\n", | |
6283 | n_vtables, n_vtable_searches); | |
6284 | fprintf (stderr, "vtable entries = %d; vtable elems = %d\n", | |
6285 | n_vtable_entries, n_vtable_elems); | |
6286 | } | |
6287 | #endif | |
6288 | } | |
6289 | ||
6290 | /* Build a dummy reference to ourselves so Derived::Base (and A::A) works, | |
6291 | according to [class]: | |
6292 | The class-name is also inserted | |
6293 | into the scope of the class itself. For purposes of access checking, | |
6294 | the inserted class name is treated as if it were a public member name. */ | |
6295 | ||
6296 | void | |
94edc4ab | 6297 | build_self_reference (void) |
ca36f057 MM |
6298 | { |
6299 | tree name = constructor_name (current_class_type); | |
6300 | tree value = build_lang_decl (TYPE_DECL, name, current_class_type); | |
6301 | tree saved_cas; | |
6302 | ||
6303 | DECL_NONLOCAL (value) = 1; | |
6304 | DECL_CONTEXT (value) = current_class_type; | |
6305 | DECL_ARTIFICIAL (value) = 1; | |
a3d87771 | 6306 | SET_DECL_SELF_REFERENCE_P (value); |
ca36f057 MM |
6307 | |
6308 | if (processing_template_decl) | |
6309 | value = push_template_decl (value); | |
6310 | ||
6311 | saved_cas = current_access_specifier; | |
6312 | current_access_specifier = access_public_node; | |
6313 | finish_member_declaration (value); | |
6314 | current_access_specifier = saved_cas; | |
6315 | } | |
6316 | ||
6317 | /* Returns 1 if TYPE contains only padding bytes. */ | |
6318 | ||
6319 | int | |
94edc4ab | 6320 | is_empty_class (tree type) |
ca36f057 | 6321 | { |
ca36f057 MM |
6322 | if (type == error_mark_node) |
6323 | return 0; | |
6324 | ||
6325 | if (! IS_AGGR_TYPE (type)) | |
6326 | return 0; | |
6327 | ||
58731fd1 MM |
6328 | /* In G++ 3.2, whether or not a class was empty was determined by |
6329 | looking at its size. */ | |
6330 | if (abi_version_at_least (2)) | |
6331 | return CLASSTYPE_EMPTY_P (type); | |
6332 | else | |
6333 | return integer_zerop (CLASSTYPE_SIZE (type)); | |
ca36f057 MM |
6334 | } |
6335 | ||
956d9305 MM |
6336 | /* Returns true if TYPE contains an empty class. */ |
6337 | ||
6338 | static bool | |
6339 | contains_empty_class_p (tree type) | |
6340 | { | |
6341 | if (is_empty_class (type)) | |
6342 | return true; | |
6343 | if (CLASS_TYPE_P (type)) | |
6344 | { | |
6345 | tree field; | |
6346 | int i; | |
6347 | ||
6348 | for (i = 0; i < CLASSTYPE_N_BASECLASSES (type); ++i) | |
6349 | if (contains_empty_class_p (TYPE_BINFO_BASETYPE (type, i))) | |
6350 | return true; | |
6351 | for (field = TYPE_FIELDS (type); field; field = TREE_CHAIN (field)) | |
17bbb839 MM |
6352 | if (TREE_CODE (field) == FIELD_DECL |
6353 | && !DECL_ARTIFICIAL (field) | |
6354 | && is_empty_class (TREE_TYPE (field))) | |
956d9305 MM |
6355 | return true; |
6356 | } | |
6357 | else if (TREE_CODE (type) == ARRAY_TYPE) | |
6358 | return contains_empty_class_p (TREE_TYPE (type)); | |
6359 | return false; | |
6360 | } | |
6361 | ||
ca36f057 MM |
6362 | /* Find the enclosing class of the given NODE. NODE can be a *_DECL or |
6363 | a *_TYPE node. NODE can also be a local class. */ | |
6364 | ||
6365 | tree | |
94edc4ab | 6366 | get_enclosing_class (tree type) |
ca36f057 MM |
6367 | { |
6368 | tree node = type; | |
6369 | ||
6370 | while (node && TREE_CODE (node) != NAMESPACE_DECL) | |
6371 | { | |
6372 | switch (TREE_CODE_CLASS (TREE_CODE (node))) | |
6373 | { | |
6374 | case 'd': | |
6375 | node = DECL_CONTEXT (node); | |
6376 | break; | |
6377 | ||
6378 | case 't': | |
6379 | if (node != type) | |
6380 | return node; | |
6381 | node = TYPE_CONTEXT (node); | |
6382 | break; | |
6383 | ||
6384 | default: | |
a98facb0 | 6385 | abort (); |
ca36f057 MM |
6386 | } |
6387 | } | |
6388 | return NULL_TREE; | |
6389 | } | |
6390 | ||
ca36f057 MM |
6391 | /* Note that NAME was looked up while the current class was being |
6392 | defined and that the result of that lookup was DECL. */ | |
6393 | ||
6394 | void | |
94edc4ab | 6395 | maybe_note_name_used_in_class (tree name, tree decl) |
ca36f057 MM |
6396 | { |
6397 | splay_tree names_used; | |
6398 | ||
6399 | /* If we're not defining a class, there's nothing to do. */ | |
a7e8c268 | 6400 | if (innermost_scope_kind() != sk_class) |
ca36f057 MM |
6401 | return; |
6402 | ||
6403 | /* If there's already a binding for this NAME, then we don't have | |
6404 | anything to worry about. */ | |
6405 | if (IDENTIFIER_CLASS_VALUE (name)) | |
6406 | return; | |
6407 | ||
6408 | if (!current_class_stack[current_class_depth - 1].names_used) | |
6409 | current_class_stack[current_class_depth - 1].names_used | |
6410 | = splay_tree_new (splay_tree_compare_pointers, 0, 0); | |
6411 | names_used = current_class_stack[current_class_depth - 1].names_used; | |
6412 | ||
6413 | splay_tree_insert (names_used, | |
6414 | (splay_tree_key) name, | |
6415 | (splay_tree_value) decl); | |
6416 | } | |
6417 | ||
6418 | /* Note that NAME was declared (as DECL) in the current class. Check | |
0e339752 | 6419 | to see that the declaration is valid. */ |
ca36f057 MM |
6420 | |
6421 | void | |
94edc4ab | 6422 | note_name_declared_in_class (tree name, tree decl) |
ca36f057 MM |
6423 | { |
6424 | splay_tree names_used; | |
6425 | splay_tree_node n; | |
6426 | ||
6427 | /* Look to see if we ever used this name. */ | |
6428 | names_used | |
6429 | = current_class_stack[current_class_depth - 1].names_used; | |
6430 | if (!names_used) | |
6431 | return; | |
6432 | ||
6433 | n = splay_tree_lookup (names_used, (splay_tree_key) name); | |
6434 | if (n) | |
6435 | { | |
6436 | /* [basic.scope.class] | |
6437 | ||
6438 | A name N used in a class S shall refer to the same declaration | |
6439 | in its context and when re-evaluated in the completed scope of | |
6440 | S. */ | |
33bd39a2 | 6441 | error ("declaration of `%#D'", decl); |
38da6039 NS |
6442 | cp_error_at ("changes meaning of `%D' from `%+#D'", |
6443 | DECL_NAME (OVL_CURRENT (decl)), | |
ca36f057 MM |
6444 | (tree) n->value); |
6445 | } | |
6446 | } | |
6447 | ||
3461fba7 NS |
6448 | /* Returns the VAR_DECL for the complete vtable associated with BINFO. |
6449 | Secondary vtables are merged with primary vtables; this function | |
6450 | will return the VAR_DECL for the primary vtable. */ | |
ca36f057 | 6451 | |
c35cce41 | 6452 | tree |
94edc4ab | 6453 | get_vtbl_decl_for_binfo (tree binfo) |
c35cce41 MM |
6454 | { |
6455 | tree decl; | |
6456 | ||
6457 | decl = BINFO_VTABLE (binfo); | |
6458 | if (decl && TREE_CODE (decl) == PLUS_EXPR) | |
6459 | { | |
6460 | my_friendly_assert (TREE_CODE (TREE_OPERAND (decl, 0)) == ADDR_EXPR, | |
6461 | 2000403); | |
6462 | decl = TREE_OPERAND (TREE_OPERAND (decl, 0), 0); | |
6463 | } | |
6464 | if (decl) | |
6465 | my_friendly_assert (TREE_CODE (decl) == VAR_DECL, 20000403); | |
6466 | return decl; | |
6467 | } | |
6468 | ||
911a71a7 | 6469 | |
dbbf88d1 NS |
6470 | /* Returns the binfo for the primary base of BINFO. If the resulting |
6471 | BINFO is a virtual base, and it is inherited elsewhere in the | |
6472 | hierarchy, then the returned binfo might not be the primary base of | |
6473 | BINFO in the complete object. Check BINFO_PRIMARY_P or | |
6474 | BINFO_LOST_PRIMARY_P to be sure. */ | |
911a71a7 MM |
6475 | |
6476 | tree | |
94edc4ab | 6477 | get_primary_binfo (tree binfo) |
911a71a7 MM |
6478 | { |
6479 | tree primary_base; | |
dbbf88d1 | 6480 | tree result; |
623fe76a | 6481 | |
911a71a7 MM |
6482 | primary_base = CLASSTYPE_PRIMARY_BINFO (BINFO_TYPE (binfo)); |
6483 | if (!primary_base) | |
6484 | return NULL_TREE; | |
6485 | ||
dbbf88d1 | 6486 | result = copied_binfo (primary_base, binfo); |
911a71a7 MM |
6487 | return result; |
6488 | } | |
6489 | ||
838dfd8a | 6490 | /* If INDENTED_P is zero, indent to INDENT. Return nonzero. */ |
b7442fb5 NS |
6491 | |
6492 | static int | |
94edc4ab | 6493 | maybe_indent_hierarchy (FILE * stream, int indent, int indented_p) |
b7442fb5 NS |
6494 | { |
6495 | if (!indented_p) | |
6496 | fprintf (stream, "%*s", indent, ""); | |
6497 | return 1; | |
6498 | } | |
6499 | ||
dbbf88d1 NS |
6500 | /* Dump the offsets of all the bases rooted at BINFO to STREAM. |
6501 | INDENT should be zero when called from the top level; it is | |
6502 | incremented recursively. IGO indicates the next expected BINFO in | |
9bcb9aae | 6503 | inheritance graph ordering. */ |
c35cce41 | 6504 | |
dbbf88d1 NS |
6505 | static tree |
6506 | dump_class_hierarchy_r (FILE *stream, | |
94edc4ab | 6507 | int flags, |
94edc4ab | 6508 | tree binfo, |
dbbf88d1 | 6509 | tree igo, |
94edc4ab | 6510 | int indent) |
ca36f057 | 6511 | { |
b7442fb5 | 6512 | int indented = 0; |
dbbf88d1 | 6513 | tree base_binfos; |
b7442fb5 NS |
6514 | |
6515 | indented = maybe_indent_hierarchy (stream, indent, 0); | |
6516 | fprintf (stream, "%s (0x%lx) ", | |
6517 | type_as_string (binfo, TFF_PLAIN_IDENTIFIER), | |
6518 | (unsigned long) binfo); | |
dbbf88d1 NS |
6519 | if (binfo != igo) |
6520 | { | |
6521 | fprintf (stream, "alternative-path\n"); | |
6522 | return igo; | |
6523 | } | |
6524 | igo = TREE_CHAIN (binfo); | |
6525 | ||
9965d119 | 6526 | fprintf (stream, HOST_WIDE_INT_PRINT_DEC, |
ca36f057 | 6527 | tree_low_cst (BINFO_OFFSET (binfo), 0)); |
9965d119 NS |
6528 | if (is_empty_class (BINFO_TYPE (binfo))) |
6529 | fprintf (stream, " empty"); | |
6530 | else if (CLASSTYPE_NEARLY_EMPTY_P (BINFO_TYPE (binfo))) | |
6531 | fprintf (stream, " nearly-empty"); | |
c35cce41 | 6532 | if (TREE_VIA_VIRTUAL (binfo)) |
dbbf88d1 | 6533 | fprintf (stream, " virtual"); |
9965d119 | 6534 | fprintf (stream, "\n"); |
ca36f057 | 6535 | |
b7442fb5 NS |
6536 | indented = 0; |
6537 | if (BINFO_PRIMARY_BASE_OF (binfo)) | |
6538 | { | |
6539 | indented = maybe_indent_hierarchy (stream, indent + 3, indented); | |
6540 | fprintf (stream, " primary-for %s (0x%lx)", | |
6541 | type_as_string (BINFO_PRIMARY_BASE_OF (binfo), | |
6542 | TFF_PLAIN_IDENTIFIER), | |
6543 | (unsigned long)BINFO_PRIMARY_BASE_OF (binfo)); | |
6544 | } | |
6545 | if (BINFO_LOST_PRIMARY_P (binfo)) | |
6546 | { | |
6547 | indented = maybe_indent_hierarchy (stream, indent + 3, indented); | |
6548 | fprintf (stream, " lost-primary"); | |
6549 | } | |
6550 | if (indented) | |
6551 | fprintf (stream, "\n"); | |
6552 | ||
6553 | if (!(flags & TDF_SLIM)) | |
6554 | { | |
6555 | int indented = 0; | |
6556 | ||
6557 | if (BINFO_SUBVTT_INDEX (binfo)) | |
6558 | { | |
6559 | indented = maybe_indent_hierarchy (stream, indent + 3, indented); | |
6560 | fprintf (stream, " subvttidx=%s", | |
6561 | expr_as_string (BINFO_SUBVTT_INDEX (binfo), | |
6562 | TFF_PLAIN_IDENTIFIER)); | |
6563 | } | |
6564 | if (BINFO_VPTR_INDEX (binfo)) | |
6565 | { | |
6566 | indented = maybe_indent_hierarchy (stream, indent + 3, indented); | |
6567 | fprintf (stream, " vptridx=%s", | |
6568 | expr_as_string (BINFO_VPTR_INDEX (binfo), | |
6569 | TFF_PLAIN_IDENTIFIER)); | |
6570 | } | |
6571 | if (BINFO_VPTR_FIELD (binfo)) | |
6572 | { | |
6573 | indented = maybe_indent_hierarchy (stream, indent + 3, indented); | |
6574 | fprintf (stream, " vbaseoffset=%s", | |
6575 | expr_as_string (BINFO_VPTR_FIELD (binfo), | |
6576 | TFF_PLAIN_IDENTIFIER)); | |
6577 | } | |
6578 | if (BINFO_VTABLE (binfo)) | |
6579 | { | |
6580 | indented = maybe_indent_hierarchy (stream, indent + 3, indented); | |
6581 | fprintf (stream, " vptr=%s", | |
6582 | expr_as_string (BINFO_VTABLE (binfo), | |
6583 | TFF_PLAIN_IDENTIFIER)); | |
6584 | } | |
6585 | ||
6586 | if (indented) | |
6587 | fprintf (stream, "\n"); | |
6588 | } | |
6589 | ||
dbbf88d1 NS |
6590 | base_binfos = BINFO_BASETYPES (binfo); |
6591 | if (base_binfos) | |
6592 | { | |
6593 | int ix, n; | |
b7442fb5 | 6594 | |
dbbf88d1 NS |
6595 | n = TREE_VEC_LENGTH (base_binfos); |
6596 | for (ix = 0; ix != n; ix++) | |
6597 | { | |
6598 | tree base_binfo = TREE_VEC_ELT (base_binfos, ix); | |
6599 | ||
6600 | igo = dump_class_hierarchy_r (stream, flags, base_binfo, | |
6601 | igo, indent + 2); | |
6602 | } | |
6603 | } | |
6604 | ||
6605 | return igo; | |
c35cce41 MM |
6606 | } |
6607 | ||
6608 | /* Dump the BINFO hierarchy for T. */ | |
6609 | ||
b7442fb5 | 6610 | static void |
bb885938 | 6611 | dump_class_hierarchy_1 (FILE *stream, int flags, tree t) |
c35cce41 | 6612 | { |
b7442fb5 NS |
6613 | fprintf (stream, "Class %s\n", type_as_string (t, TFF_PLAIN_IDENTIFIER)); |
6614 | fprintf (stream, " size=%lu align=%lu\n", | |
6615 | (unsigned long)(tree_low_cst (TYPE_SIZE (t), 0) / BITS_PER_UNIT), | |
6616 | (unsigned long)(TYPE_ALIGN (t) / BITS_PER_UNIT)); | |
dbbf88d1 NS |
6617 | fprintf (stream, " base size=%lu base align=%lu\n", |
6618 | (unsigned long)(tree_low_cst (TYPE_SIZE (CLASSTYPE_AS_BASE (t)), 0) | |
6619 | / BITS_PER_UNIT), | |
6620 | (unsigned long)(TYPE_ALIGN (CLASSTYPE_AS_BASE (t)) | |
6621 | / BITS_PER_UNIT)); | |
6622 | dump_class_hierarchy_r (stream, flags, TYPE_BINFO (t), TYPE_BINFO (t), 0); | |
b7442fb5 | 6623 | fprintf (stream, "\n"); |
bb885938 NS |
6624 | } |
6625 | ||
da1d7781 | 6626 | /* Debug interface to hierarchy dumping. */ |
bb885938 NS |
6627 | |
6628 | extern void | |
6629 | debug_class (tree t) | |
6630 | { | |
6631 | dump_class_hierarchy_1 (stderr, TDF_SLIM, t); | |
6632 | } | |
6633 | ||
6634 | static void | |
6635 | dump_class_hierarchy (tree t) | |
6636 | { | |
6637 | int flags; | |
6638 | FILE *stream = dump_begin (TDI_class, &flags); | |
6639 | ||
6640 | if (stream) | |
6641 | { | |
6642 | dump_class_hierarchy_1 (stream, flags, t); | |
6643 | dump_end (TDI_class, stream); | |
6644 | } | |
b7442fb5 NS |
6645 | } |
6646 | ||
6647 | static void | |
94edc4ab | 6648 | dump_array (FILE * stream, tree decl) |
b7442fb5 NS |
6649 | { |
6650 | tree inits; | |
6651 | int ix; | |
6652 | HOST_WIDE_INT elt; | |
6653 | tree size = TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (decl))); | |
6654 | ||
6655 | elt = (tree_low_cst (TYPE_SIZE (TREE_TYPE (TREE_TYPE (decl))), 0) | |
6656 | / BITS_PER_UNIT); | |
6657 | fprintf (stream, "%s:", decl_as_string (decl, TFF_PLAIN_IDENTIFIER)); | |
6658 | fprintf (stream, " %s entries", | |
6659 | expr_as_string (size_binop (PLUS_EXPR, size, size_one_node), | |
6660 | TFF_PLAIN_IDENTIFIER)); | |
6661 | fprintf (stream, "\n"); | |
6662 | ||
522801e7 | 6663 | for (ix = 0, inits = CONSTRUCTOR_ELTS (DECL_INITIAL (decl)); |
b7442fb5 | 6664 | inits; ix++, inits = TREE_CHAIN (inits)) |
4fdc14ca | 6665 | fprintf (stream, "%-4ld %s\n", (long)(ix * elt), |
b7442fb5 NS |
6666 | expr_as_string (TREE_VALUE (inits), TFF_PLAIN_IDENTIFIER)); |
6667 | } | |
6668 | ||
6669 | static void | |
94edc4ab | 6670 | dump_vtable (tree t, tree binfo, tree vtable) |
b7442fb5 NS |
6671 | { |
6672 | int flags; | |
6673 | FILE *stream = dump_begin (TDI_class, &flags); | |
6674 | ||
6675 | if (!stream) | |
6676 | return; | |
6677 | ||
6678 | if (!(flags & TDF_SLIM)) | |
9965d119 | 6679 | { |
b7442fb5 | 6680 | int ctor_vtbl_p = TYPE_BINFO (t) != binfo; |
9965d119 | 6681 | |
b7442fb5 NS |
6682 | fprintf (stream, "%s for %s", |
6683 | ctor_vtbl_p ? "Construction vtable" : "Vtable", | |
6684 | type_as_string (binfo, TFF_PLAIN_IDENTIFIER)); | |
6685 | if (ctor_vtbl_p) | |
6686 | { | |
6687 | if (!TREE_VIA_VIRTUAL (binfo)) | |
6688 | fprintf (stream, " (0x%lx instance)", (unsigned long)binfo); | |
6689 | fprintf (stream, " in %s", type_as_string (t, TFF_PLAIN_IDENTIFIER)); | |
6690 | } | |
6691 | fprintf (stream, "\n"); | |
6692 | dump_array (stream, vtable); | |
6693 | fprintf (stream, "\n"); | |
9965d119 | 6694 | } |
b7442fb5 NS |
6695 | |
6696 | dump_end (TDI_class, stream); | |
6697 | } | |
6698 | ||
6699 | static void | |
94edc4ab | 6700 | dump_vtt (tree t, tree vtt) |
b7442fb5 NS |
6701 | { |
6702 | int flags; | |
6703 | FILE *stream = dump_begin (TDI_class, &flags); | |
6704 | ||
6705 | if (!stream) | |
6706 | return; | |
6707 | ||
6708 | if (!(flags & TDF_SLIM)) | |
6709 | { | |
6710 | fprintf (stream, "VTT for %s\n", | |
6711 | type_as_string (t, TFF_PLAIN_IDENTIFIER)); | |
6712 | dump_array (stream, vtt); | |
6713 | fprintf (stream, "\n"); | |
6714 | } | |
6715 | ||
6716 | dump_end (TDI_class, stream); | |
ca36f057 MM |
6717 | } |
6718 | ||
bb885938 NS |
6719 | /* Dump a function or thunk and its thunkees. */ |
6720 | ||
6721 | static void | |
6722 | dump_thunk (FILE *stream, int indent, tree thunk) | |
6723 | { | |
6724 | static const char spaces[] = " "; | |
6725 | tree name = DECL_NAME (thunk); | |
6726 | tree thunks; | |
6727 | ||
6728 | fprintf (stream, "%.*s%p %s %s", indent, spaces, | |
6729 | (void *)thunk, | |
6730 | !DECL_THUNK_P (thunk) ? "function" | |
6731 | : DECL_THIS_THUNK_P (thunk) ? "this-thunk" : "covariant-thunk", | |
6732 | name ? IDENTIFIER_POINTER (name) : "<unset>"); | |
e00853fd | 6733 | if (DECL_THUNK_P (thunk)) |
bb885938 NS |
6734 | { |
6735 | HOST_WIDE_INT fixed_adjust = THUNK_FIXED_OFFSET (thunk); | |
6736 | tree virtual_adjust = THUNK_VIRTUAL_OFFSET (thunk); | |
6737 | ||
6738 | fprintf (stream, " fixed=" HOST_WIDE_INT_PRINT_DEC, fixed_adjust); | |
6739 | if (!virtual_adjust) | |
6740 | /*NOP*/; | |
6741 | else if (DECL_THIS_THUNK_P (thunk)) | |
6742 | fprintf (stream, " vcall=" HOST_WIDE_INT_PRINT_DEC, | |
6743 | tree_low_cst (virtual_adjust, 0)); | |
6744 | else | |
6745 | fprintf (stream, " vbase=" HOST_WIDE_INT_PRINT_DEC "(%s)", | |
6746 | tree_low_cst (BINFO_VPTR_FIELD (virtual_adjust), 0), | |
6747 | type_as_string (BINFO_TYPE (virtual_adjust), TFF_SCOPE)); | |
e00853fd NS |
6748 | if (THUNK_ALIAS (thunk)) |
6749 | fprintf (stream, " alias to %p", (void *)THUNK_ALIAS (thunk)); | |
bb885938 NS |
6750 | } |
6751 | fprintf (stream, "\n"); | |
6752 | for (thunks = DECL_THUNKS (thunk); thunks; thunks = TREE_CHAIN (thunks)) | |
6753 | dump_thunk (stream, indent + 2, thunks); | |
6754 | } | |
6755 | ||
6756 | /* Dump the thunks for FN. */ | |
6757 | ||
6758 | extern void | |
6759 | debug_thunks (tree fn) | |
6760 | { | |
6761 | dump_thunk (stderr, 0, fn); | |
6762 | } | |
6763 | ||
ca36f057 MM |
6764 | /* Virtual function table initialization. */ |
6765 | ||
6766 | /* Create all the necessary vtables for T and its base classes. */ | |
6767 | ||
6768 | static void | |
94edc4ab | 6769 | finish_vtbls (tree t) |
ca36f057 | 6770 | { |
3461fba7 NS |
6771 | tree list; |
6772 | tree vbase; | |
ca36f057 | 6773 | |
3461fba7 NS |
6774 | /* We lay out the primary and secondary vtables in one contiguous |
6775 | vtable. The primary vtable is first, followed by the non-virtual | |
6776 | secondary vtables in inheritance graph order. */ | |
6777 | list = build_tree_list (TYPE_BINFO_VTABLE (t), NULL_TREE); | |
6778 | accumulate_vtbl_inits (TYPE_BINFO (t), TYPE_BINFO (t), | |
6779 | TYPE_BINFO (t), t, list); | |
6780 | ||
6781 | /* Then come the virtual bases, also in inheritance graph order. */ | |
6782 | for (vbase = TYPE_BINFO (t); vbase; vbase = TREE_CHAIN (vbase)) | |
6783 | { | |
3461fba7 NS |
6784 | if (!TREE_VIA_VIRTUAL (vbase)) |
6785 | continue; | |
dbbf88d1 | 6786 | accumulate_vtbl_inits (vbase, vbase, TYPE_BINFO (t), t, list); |
ff668506 JM |
6787 | } |
6788 | ||
3461fba7 NS |
6789 | if (TYPE_BINFO_VTABLE (t)) |
6790 | initialize_vtable (TYPE_BINFO (t), TREE_VALUE (list)); | |
ca36f057 MM |
6791 | } |
6792 | ||
6793 | /* Initialize the vtable for BINFO with the INITS. */ | |
6794 | ||
6795 | static void | |
94edc4ab | 6796 | initialize_vtable (tree binfo, tree inits) |
ca36f057 | 6797 | { |
ca36f057 MM |
6798 | tree decl; |
6799 | ||
6800 | layout_vtable_decl (binfo, list_length (inits)); | |
c35cce41 | 6801 | decl = get_vtbl_decl_for_binfo (binfo); |
23656158 | 6802 | initialize_array (decl, inits); |
b7442fb5 | 6803 | dump_vtable (BINFO_TYPE (binfo), binfo, decl); |
23656158 MM |
6804 | } |
6805 | ||
6806 | /* Initialize DECL (a declaration for a namespace-scope array) with | |
6807 | the INITS. */ | |
6808 | ||
6809 | static void | |
94edc4ab | 6810 | initialize_array (tree decl, tree inits) |
23656158 MM |
6811 | { |
6812 | tree context; | |
6813 | ||
ca36f057 | 6814 | context = DECL_CONTEXT (decl); |
23656158 | 6815 | DECL_CONTEXT (decl) = NULL_TREE; |
dcf92453 | 6816 | DECL_INITIAL (decl) = build_constructor (NULL_TREE, inits); |
8e3df2de | 6817 | TREE_HAS_CONSTRUCTOR (DECL_INITIAL (decl)) = 1; |
ca36f057 MM |
6818 | cp_finish_decl (decl, DECL_INITIAL (decl), NULL_TREE, 0); |
6819 | DECL_CONTEXT (decl) = context; | |
6820 | } | |
6821 | ||
9965d119 NS |
6822 | /* Build the VTT (virtual table table) for T. |
6823 | A class requires a VTT if it has virtual bases. | |
6824 | ||
6825 | This holds | |
6826 | 1 - primary virtual pointer for complete object T | |
90ecce3e JM |
6827 | 2 - secondary VTTs for each direct non-virtual base of T which requires a |
6828 | VTT | |
9965d119 NS |
6829 | 3 - secondary virtual pointers for each direct or indirect base of T which |
6830 | has virtual bases or is reachable via a virtual path from T. | |
6831 | 4 - secondary VTTs for each direct or indirect virtual base of T. | |
6832 | ||
6833 | Secondary VTTs look like complete object VTTs without part 4. */ | |
23656158 MM |
6834 | |
6835 | static void | |
94edc4ab | 6836 | build_vtt (tree t) |
23656158 MM |
6837 | { |
6838 | tree inits; | |
6839 | tree type; | |
6840 | tree vtt; | |
3ec6bad3 | 6841 | tree index; |
23656158 | 6842 | |
23656158 MM |
6843 | /* Build up the initializers for the VTT. */ |
6844 | inits = NULL_TREE; | |
3ec6bad3 | 6845 | index = size_zero_node; |
9965d119 | 6846 | build_vtt_inits (TYPE_BINFO (t), t, &inits, &index); |
23656158 MM |
6847 | |
6848 | /* If we didn't need a VTT, we're done. */ | |
6849 | if (!inits) | |
6850 | return; | |
6851 | ||
6852 | /* Figure out the type of the VTT. */ | |
442e01b6 | 6853 | type = build_index_type (size_int (list_length (inits) - 1)); |
23656158 MM |
6854 | type = build_cplus_array_type (const_ptr_type_node, type); |
6855 | ||
6856 | /* Now, build the VTT object itself. */ | |
669ec2b4 | 6857 | vtt = build_vtable (t, get_vtt_name (t), type); |
23656158 | 6858 | initialize_array (vtt, inits); |
548502d3 MM |
6859 | /* Add the VTT to the vtables list. */ |
6860 | TREE_CHAIN (vtt) = TREE_CHAIN (CLASSTYPE_VTABLES (t)); | |
6861 | TREE_CHAIN (CLASSTYPE_VTABLES (t)) = vtt; | |
b7442fb5 NS |
6862 | |
6863 | dump_vtt (t, vtt); | |
23656158 MM |
6864 | } |
6865 | ||
13de7ec4 JM |
6866 | /* When building a secondary VTT, BINFO_VTABLE is set to a TREE_LIST with |
6867 | PURPOSE the RTTI_BINFO, VALUE the real vtable pointer for this binfo, | |
6868 | and CHAIN the vtable pointer for this binfo after construction is | |
00a17e31 | 6869 | complete. VALUE can also be another BINFO, in which case we recurse. */ |
13de7ec4 JM |
6870 | |
6871 | static tree | |
94edc4ab | 6872 | binfo_ctor_vtable (tree binfo) |
13de7ec4 JM |
6873 | { |
6874 | tree vt; | |
6875 | ||
6876 | while (1) | |
6877 | { | |
6878 | vt = BINFO_VTABLE (binfo); | |
6879 | if (TREE_CODE (vt) == TREE_LIST) | |
6880 | vt = TREE_VALUE (vt); | |
6881 | if (TREE_CODE (vt) == TREE_VEC) | |
6882 | binfo = vt; | |
6883 | else | |
6884 | break; | |
6885 | } | |
6886 | ||
6887 | return vt; | |
6888 | } | |
6889 | ||
23656158 | 6890 | /* Recursively build the VTT-initializer for BINFO (which is in the |
9965d119 NS |
6891 | hierarchy dominated by T). INITS points to the end of the initializer |
6892 | list to date. INDEX is the VTT index where the next element will be | |
6893 | replaced. Iff BINFO is the binfo for T, this is the top level VTT (i.e. | |
6894 | not a subvtt for some base of T). When that is so, we emit the sub-VTTs | |
6895 | for virtual bases of T. When it is not so, we build the constructor | |
6896 | vtables for the BINFO-in-T variant. */ | |
23656158 MM |
6897 | |
6898 | static tree * | |
94edc4ab | 6899 | build_vtt_inits (tree binfo, tree t, tree* inits, tree* index) |
23656158 MM |
6900 | { |
6901 | int i; | |
6902 | tree b; | |
6903 | tree init; | |
6904 | tree secondary_vptrs; | |
9965d119 | 6905 | int top_level_p = same_type_p (TREE_TYPE (binfo), t); |
23656158 MM |
6906 | |
6907 | /* We only need VTTs for subobjects with virtual bases. */ | |
6908 | if (!TYPE_USES_VIRTUAL_BASECLASSES (BINFO_TYPE (binfo))) | |
6909 | return inits; | |
6910 | ||
6911 | /* We need to use a construction vtable if this is not the primary | |
6912 | VTT. */ | |
9965d119 | 6913 | if (!top_level_p) |
3ec6bad3 MM |
6914 | { |
6915 | build_ctor_vtbl_group (binfo, t); | |
6916 | ||
6917 | /* Record the offset in the VTT where this sub-VTT can be found. */ | |
6918 | BINFO_SUBVTT_INDEX (binfo) = *index; | |
6919 | } | |
23656158 MM |
6920 | |
6921 | /* Add the address of the primary vtable for the complete object. */ | |
13de7ec4 | 6922 | init = binfo_ctor_vtable (binfo); |
23656158 MM |
6923 | *inits = build_tree_list (NULL_TREE, init); |
6924 | inits = &TREE_CHAIN (*inits); | |
9965d119 NS |
6925 | if (top_level_p) |
6926 | { | |
6927 | my_friendly_assert (!BINFO_VPTR_INDEX (binfo), 20010129); | |
6928 | BINFO_VPTR_INDEX (binfo) = *index; | |
6929 | } | |
3ec6bad3 MM |
6930 | *index = size_binop (PLUS_EXPR, *index, TYPE_SIZE_UNIT (ptr_type_node)); |
6931 | ||
23656158 MM |
6932 | /* Recursively add the secondary VTTs for non-virtual bases. */ |
6933 | for (i = 0; i < BINFO_N_BASETYPES (binfo); ++i) | |
6934 | { | |
6935 | b = BINFO_BASETYPE (binfo, i); | |
6936 | if (!TREE_VIA_VIRTUAL (b)) | |
9ccf6541 | 6937 | inits = build_vtt_inits (BINFO_BASETYPE (binfo, i), t, |
9ccf6541 | 6938 | inits, index); |
23656158 | 6939 | } |
3ec6bad3 | 6940 | |
23656158 | 6941 | /* Add secondary virtual pointers for all subobjects of BINFO with |
9965d119 NS |
6942 | either virtual bases or reachable along a virtual path, except |
6943 | subobjects that are non-virtual primary bases. */ | |
9ccf6541 | 6944 | secondary_vptrs = tree_cons (t, NULL_TREE, BINFO_TYPE (binfo)); |
3ec6bad3 | 6945 | TREE_TYPE (secondary_vptrs) = *index; |
9965d119 NS |
6946 | VTT_TOP_LEVEL_P (secondary_vptrs) = top_level_p; |
6947 | VTT_MARKED_BINFO_P (secondary_vptrs) = 0; | |
6948 | ||
23656158 | 6949 | dfs_walk_real (binfo, |
9ccf6541 | 6950 | dfs_build_secondary_vptr_vtt_inits, |
23656158 | 6951 | NULL, |
9965d119 | 6952 | dfs_ctor_vtable_bases_queue_p, |
23656158 | 6953 | secondary_vptrs); |
9965d119 NS |
6954 | VTT_MARKED_BINFO_P (secondary_vptrs) = 1; |
6955 | dfs_walk (binfo, dfs_unmark, dfs_ctor_vtable_bases_queue_p, | |
6956 | secondary_vptrs); | |
6957 | ||
3ec6bad3 | 6958 | *index = TREE_TYPE (secondary_vptrs); |
23656158 MM |
6959 | |
6960 | /* The secondary vptrs come back in reverse order. After we reverse | |
6961 | them, and add the INITS, the last init will be the first element | |
6962 | of the chain. */ | |
6963 | secondary_vptrs = TREE_VALUE (secondary_vptrs); | |
6964 | if (secondary_vptrs) | |
6965 | { | |
6966 | *inits = nreverse (secondary_vptrs); | |
6967 | inits = &TREE_CHAIN (secondary_vptrs); | |
6968 | my_friendly_assert (*inits == NULL_TREE, 20000517); | |
6969 | } | |
6970 | ||
6971 | /* Add the secondary VTTs for virtual bases. */ | |
9965d119 | 6972 | if (top_level_p) |
9ccf6541 MM |
6973 | for (b = TYPE_BINFO (BINFO_TYPE (binfo)); b; b = TREE_CHAIN (b)) |
6974 | { | |
9ccf6541 MM |
6975 | if (!TREE_VIA_VIRTUAL (b)) |
6976 | continue; | |
6977 | ||
dbbf88d1 | 6978 | inits = build_vtt_inits (b, t, inits, index); |
9ccf6541 | 6979 | } |
23656158 | 6980 | |
9965d119 NS |
6981 | if (!top_level_p) |
6982 | { | |
6983 | tree data = tree_cons (t, binfo, NULL_TREE); | |
6984 | VTT_TOP_LEVEL_P (data) = 0; | |
6985 | VTT_MARKED_BINFO_P (data) = 0; | |
6986 | ||
6987 | dfs_walk (binfo, dfs_fixup_binfo_vtbls, | |
6988 | dfs_ctor_vtable_bases_queue_p, | |
6989 | data); | |
6990 | } | |
23656158 MM |
6991 | |
6992 | return inits; | |
6993 | } | |
6994 | ||
9965d119 NS |
6995 | /* Called from build_vtt_inits via dfs_walk. BINFO is the binfo |
6996 | for the base in most derived. DATA is a TREE_LIST who's | |
6997 | TREE_CHAIN is the type of the base being | |
6998 | constructed whilst this secondary vptr is live. The TREE_UNSIGNED | |
6999 | flag of DATA indicates that this is a constructor vtable. The | |
7000 | TREE_TOP_LEVEL flag indicates that this is the primary VTT. */ | |
23656158 MM |
7001 | |
7002 | static tree | |
94edc4ab | 7003 | dfs_build_secondary_vptr_vtt_inits (tree binfo, void* data) |
23656158 MM |
7004 | { |
7005 | tree l; | |
7006 | tree t; | |
7007 | tree init; | |
3ec6bad3 | 7008 | tree index; |
9965d119 | 7009 | int top_level_p; |
23656158 MM |
7010 | |
7011 | l = (tree) data; | |
9ccf6541 | 7012 | t = TREE_CHAIN (l); |
9965d119 NS |
7013 | top_level_p = VTT_TOP_LEVEL_P (l); |
7014 | ||
dbbf88d1 | 7015 | BINFO_MARKED (binfo) = 1; |
23656158 MM |
7016 | |
7017 | /* We don't care about bases that don't have vtables. */ | |
7018 | if (!TYPE_VFIELD (BINFO_TYPE (binfo))) | |
7019 | return NULL_TREE; | |
7020 | ||
7021 | /* We're only interested in proper subobjects of T. */ | |
7022 | if (same_type_p (BINFO_TYPE (binfo), t)) | |
7023 | return NULL_TREE; | |
7024 | ||
7025 | /* We're not interested in non-virtual primary bases. */ | |
9965d119 | 7026 | if (!TREE_VIA_VIRTUAL (binfo) && BINFO_PRIMARY_P (binfo)) |
23656158 MM |
7027 | return NULL_TREE; |
7028 | ||
9965d119 NS |
7029 | /* If BINFO has virtual bases or is reachable via a virtual path |
7030 | from T, it'll have a secondary vptr. */ | |
db3d8cde | 7031 | if (!TYPE_USES_VIRTUAL_BASECLASSES (BINFO_TYPE (binfo)) |
9965d119 | 7032 | && !binfo_via_virtual (binfo, t)) |
db3d8cde | 7033 | return NULL_TREE; |
23656158 | 7034 | |
3ec6bad3 MM |
7035 | /* Record the index where this secondary vptr can be found. */ |
7036 | index = TREE_TYPE (l); | |
9965d119 NS |
7037 | if (top_level_p) |
7038 | { | |
7039 | my_friendly_assert (!BINFO_VPTR_INDEX (binfo), 20010129); | |
7040 | BINFO_VPTR_INDEX (binfo) = index; | |
7041 | } | |
3ec6bad3 MM |
7042 | TREE_TYPE (l) = size_binop (PLUS_EXPR, index, |
7043 | TYPE_SIZE_UNIT (ptr_type_node)); | |
7044 | ||
7045 | /* Add the initializer for the secondary vptr itself. */ | |
9965d119 NS |
7046 | if (top_level_p && TREE_VIA_VIRTUAL (binfo)) |
7047 | { | |
7048 | /* It's a primary virtual base, and this is not the construction | |
7049 | vtable. Find the base this is primary of in the inheritance graph, | |
00a17e31 | 7050 | and use that base's vtable now. */ |
9965d119 NS |
7051 | while (BINFO_PRIMARY_BASE_OF (binfo)) |
7052 | binfo = BINFO_PRIMARY_BASE_OF (binfo); | |
7053 | } | |
13de7ec4 | 7054 | init = binfo_ctor_vtable (binfo); |
23656158 | 7055 | TREE_VALUE (l) = tree_cons (NULL_TREE, init, TREE_VALUE (l)); |
3ec6bad3 | 7056 | |
23656158 MM |
7057 | return NULL_TREE; |
7058 | } | |
7059 | ||
9965d119 | 7060 | /* dfs_walk_real predicate for building vtables. DATA is a TREE_LIST, |
b7ad2f8b NS |
7061 | VTT_MARKED_BINFO_P indicates whether marked or unmarked bases |
7062 | should be walked. TREE_PURPOSE is the TREE_TYPE that dominates the | |
7063 | hierarchy. */ | |
9965d119 NS |
7064 | |
7065 | static tree | |
dbbf88d1 NS |
7066 | dfs_ctor_vtable_bases_queue_p (tree derived, int ix, |
7067 | void* data) | |
9965d119 | 7068 | { |
dbbf88d1 NS |
7069 | tree binfo = BINFO_BASETYPE (derived, ix); |
7070 | ||
9965d119 NS |
7071 | if (!BINFO_MARKED (binfo) == VTT_MARKED_BINFO_P ((tree) data)) |
7072 | return NULL_TREE; | |
7073 | return binfo; | |
7074 | } | |
7075 | ||
7076 | /* Called from build_vtt_inits via dfs_walk. After building constructor | |
7077 | vtables and generating the sub-vtt from them, we need to restore the | |
7078 | BINFO_VTABLES that were scribbled on. DATA is a TREE_LIST whose | |
7079 | TREE_VALUE is the TREE_TYPE of the base whose sub vtt was generated. */ | |
23656158 MM |
7080 | |
7081 | static tree | |
94edc4ab | 7082 | dfs_fixup_binfo_vtbls (tree binfo, void* data) |
23656158 | 7083 | { |
dbbf88d1 | 7084 | BINFO_MARKED (binfo) = 0; |
23656158 MM |
7085 | |
7086 | /* We don't care about bases that don't have vtables. */ | |
7087 | if (!TYPE_VFIELD (BINFO_TYPE (binfo))) | |
7088 | return NULL_TREE; | |
7089 | ||
7090 | /* If we scribbled the construction vtable vptr into BINFO, clear it | |
7091 | out now. */ | |
85a9a0a2 NS |
7092 | if (BINFO_VTABLE (binfo) |
7093 | && TREE_CODE (BINFO_VTABLE (binfo)) == TREE_LIST | |
9ccf6541 MM |
7094 | && (TREE_PURPOSE (BINFO_VTABLE (binfo)) |
7095 | == TREE_VALUE ((tree) data))) | |
7096 | BINFO_VTABLE (binfo) = TREE_CHAIN (BINFO_VTABLE (binfo)); | |
23656158 MM |
7097 | |
7098 | return NULL_TREE; | |
7099 | } | |
7100 | ||
7101 | /* Build the construction vtable group for BINFO which is in the | |
7102 | hierarchy dominated by T. */ | |
7103 | ||
7104 | static void | |
94edc4ab | 7105 | build_ctor_vtbl_group (tree binfo, tree t) |
23656158 MM |
7106 | { |
7107 | tree list; | |
7108 | tree type; | |
7109 | tree vtbl; | |
7110 | tree inits; | |
7111 | tree id; | |
9ccf6541 | 7112 | tree vbase; |
23656158 | 7113 | |
7bdcf888 | 7114 | /* See if we've already created this construction vtable group. */ |
1f84ec23 | 7115 | id = mangle_ctor_vtbl_for_type (t, binfo); |
23656158 MM |
7116 | if (IDENTIFIER_GLOBAL_VALUE (id)) |
7117 | return; | |
7118 | ||
9965d119 | 7119 | my_friendly_assert (!same_type_p (BINFO_TYPE (binfo), t), 20010124); |
23656158 MM |
7120 | /* Build a version of VTBL (with the wrong type) for use in |
7121 | constructing the addresses of secondary vtables in the | |
7122 | construction vtable group. */ | |
459c43ad | 7123 | vtbl = build_vtable (t, id, ptr_type_node); |
23656158 MM |
7124 | list = build_tree_list (vtbl, NULL_TREE); |
7125 | accumulate_vtbl_inits (binfo, TYPE_BINFO (TREE_TYPE (binfo)), | |
7126 | binfo, t, list); | |
9965d119 NS |
7127 | |
7128 | /* Add the vtables for each of our virtual bases using the vbase in T | |
7129 | binfo. */ | |
7130 | for (vbase = TYPE_BINFO (BINFO_TYPE (binfo)); | |
9ccf6541 MM |
7131 | vbase; |
7132 | vbase = TREE_CHAIN (vbase)) | |
7133 | { | |
7134 | tree b; | |
7135 | ||
7136 | if (!TREE_VIA_VIRTUAL (vbase)) | |
7137 | continue; | |
dbbf88d1 | 7138 | b = copied_binfo (vbase, binfo); |
9965d119 | 7139 | |
dbbf88d1 | 7140 | accumulate_vtbl_inits (b, vbase, binfo, t, list); |
9ccf6541 | 7141 | } |
99389463 | 7142 | inits = TREE_VALUE (list); |
23656158 MM |
7143 | |
7144 | /* Figure out the type of the construction vtable. */ | |
442e01b6 | 7145 | type = build_index_type (size_int (list_length (inits) - 1)); |
23656158 MM |
7146 | type = build_cplus_array_type (vtable_entry_type, type); |
7147 | TREE_TYPE (vtbl) = type; | |
7148 | ||
7149 | /* Initialize the construction vtable. */ | |
548502d3 | 7150 | CLASSTYPE_VTABLES (t) = chainon (CLASSTYPE_VTABLES (t), vtbl); |
23656158 | 7151 | initialize_array (vtbl, inits); |
b7442fb5 | 7152 | dump_vtable (t, binfo, vtbl); |
23656158 MM |
7153 | } |
7154 | ||
9965d119 NS |
7155 | /* Add the vtbl initializers for BINFO (and its bases other than |
7156 | non-virtual primaries) to the list of INITS. BINFO is in the | |
7157 | hierarchy dominated by T. RTTI_BINFO is the binfo within T of | |
7158 | the constructor the vtbl inits should be accumulated for. (If this | |
7159 | is the complete object vtbl then RTTI_BINFO will be TYPE_BINFO (T).) | |
7160 | ORIG_BINFO is the binfo for this object within BINFO_TYPE (RTTI_BINFO). | |
7161 | BINFO is the active base equivalent of ORIG_BINFO in the inheritance | |
7162 | graph of T. Both BINFO and ORIG_BINFO will have the same BINFO_TYPE, | |
7163 | but are not necessarily the same in terms of layout. */ | |
ca36f057 MM |
7164 | |
7165 | static void | |
94edc4ab NN |
7166 | accumulate_vtbl_inits (tree binfo, |
7167 | tree orig_binfo, | |
7168 | tree rtti_binfo, | |
7169 | tree t, | |
7170 | tree inits) | |
ca36f057 | 7171 | { |
23656158 | 7172 | int i; |
9965d119 | 7173 | int ctor_vtbl_p = !same_type_p (BINFO_TYPE (rtti_binfo), t); |
23656158 MM |
7174 | |
7175 | my_friendly_assert (same_type_p (BINFO_TYPE (binfo), | |
7176 | BINFO_TYPE (orig_binfo)), | |
7177 | 20000517); | |
7178 | ||
00a17e31 | 7179 | /* If it doesn't have a vptr, we don't do anything. */ |
623fe76a NS |
7180 | if (!TYPE_CONTAINS_VPTR_P (BINFO_TYPE (binfo))) |
7181 | return; | |
7182 | ||
23656158 MM |
7183 | /* If we're building a construction vtable, we're not interested in |
7184 | subobjects that don't require construction vtables. */ | |
7185 | if (ctor_vtbl_p | |
9ccf6541 | 7186 | && !TYPE_USES_VIRTUAL_BASECLASSES (BINFO_TYPE (binfo)) |
9965d119 | 7187 | && !binfo_via_virtual (orig_binfo, BINFO_TYPE (rtti_binfo))) |
23656158 MM |
7188 | return; |
7189 | ||
7190 | /* Build the initializers for the BINFO-in-T vtable. */ | |
7191 | TREE_VALUE (inits) | |
7192 | = chainon (TREE_VALUE (inits), | |
7193 | dfs_accumulate_vtbl_inits (binfo, orig_binfo, | |
7194 | rtti_binfo, t, inits)); | |
7195 | ||
c35cce41 MM |
7196 | /* Walk the BINFO and its bases. We walk in preorder so that as we |
7197 | initialize each vtable we can figure out at what offset the | |
23656158 MM |
7198 | secondary vtable lies from the primary vtable. We can't use |
7199 | dfs_walk here because we need to iterate through bases of BINFO | |
7200 | and RTTI_BINFO simultaneously. */ | |
7201 | for (i = 0; i < BINFO_N_BASETYPES (binfo); ++i) | |
7202 | { | |
9965d119 NS |
7203 | tree base_binfo = BINFO_BASETYPE (binfo, i); |
7204 | ||
23656158 MM |
7205 | /* Skip virtual bases. */ |
7206 | if (TREE_VIA_VIRTUAL (base_binfo)) | |
7207 | continue; | |
7208 | accumulate_vtbl_inits (base_binfo, | |
7209 | BINFO_BASETYPE (orig_binfo, i), | |
9965d119 | 7210 | rtti_binfo, t, |
23656158 MM |
7211 | inits); |
7212 | } | |
ca36f057 MM |
7213 | } |
7214 | ||
3461fba7 NS |
7215 | /* Called from accumulate_vtbl_inits. Returns the initializers for |
7216 | the BINFO vtable. */ | |
ca36f057 MM |
7217 | |
7218 | static tree | |
94edc4ab NN |
7219 | dfs_accumulate_vtbl_inits (tree binfo, |
7220 | tree orig_binfo, | |
7221 | tree rtti_binfo, | |
7222 | tree t, | |
7223 | tree l) | |
ca36f057 | 7224 | { |
23656158 | 7225 | tree inits = NULL_TREE; |
9965d119 NS |
7226 | tree vtbl = NULL_TREE; |
7227 | int ctor_vtbl_p = !same_type_p (BINFO_TYPE (rtti_binfo), t); | |
7228 | ||
13de7ec4 JM |
7229 | if (ctor_vtbl_p |
7230 | && TREE_VIA_VIRTUAL (orig_binfo) && BINFO_PRIMARY_P (orig_binfo)) | |
9965d119 | 7231 | { |
13de7ec4 JM |
7232 | /* In the hierarchy of BINFO_TYPE (RTTI_BINFO), this is a |
7233 | primary virtual base. If it is not the same primary in | |
7234 | the hierarchy of T, we'll need to generate a ctor vtable | |
7235 | for it, to place at its location in T. If it is the same | |
7236 | primary, we still need a VTT entry for the vtable, but it | |
7237 | should point to the ctor vtable for the base it is a | |
7238 | primary for within the sub-hierarchy of RTTI_BINFO. | |
7bdcf888 | 7239 | |
13de7ec4 | 7240 | There are three possible cases: |
7bdcf888 | 7241 | |
13de7ec4 JM |
7242 | 1) We are in the same place. |
7243 | 2) We are a primary base within a lost primary virtual base of | |
7244 | RTTI_BINFO. | |
049d2def | 7245 | 3) We are primary to something not a base of RTTI_BINFO. */ |
7bdcf888 | 7246 | |
13de7ec4 JM |
7247 | tree b = BINFO_PRIMARY_BASE_OF (binfo); |
7248 | tree last = NULL_TREE; | |
85a9a0a2 | 7249 | |
13de7ec4 JM |
7250 | /* First, look through the bases we are primary to for RTTI_BINFO |
7251 | or a virtual base. */ | |
7252 | for (; b; b = BINFO_PRIMARY_BASE_OF (b)) | |
7bdcf888 | 7253 | { |
13de7ec4 JM |
7254 | last = b; |
7255 | if (TREE_VIA_VIRTUAL (b) || b == rtti_binfo) | |
7256 | break; | |
7bdcf888 | 7257 | } |
13de7ec4 JM |
7258 | /* If we run out of primary links, keep looking down our |
7259 | inheritance chain; we might be an indirect primary. */ | |
7260 | if (b == NULL_TREE) | |
7261 | for (b = last; b; b = BINFO_INHERITANCE_CHAIN (b)) | |
7262 | if (TREE_VIA_VIRTUAL (b) || b == rtti_binfo) | |
7263 | break; | |
7264 | ||
7265 | /* If we found RTTI_BINFO, this is case 1. If we found a virtual | |
7266 | base B and it is a base of RTTI_BINFO, this is case 2. In | |
7267 | either case, we share our vtable with LAST, i.e. the | |
7268 | derived-most base within B of which we are a primary. */ | |
7269 | if (b == rtti_binfo | |
dbbf88d1 NS |
7270 | || (b && purpose_member (BINFO_TYPE (b), |
7271 | CLASSTYPE_VBASECLASSES (BINFO_TYPE (rtti_binfo))))) | |
049d2def JM |
7272 | /* Just set our BINFO_VTABLE to point to LAST, as we may not have |
7273 | set LAST's BINFO_VTABLE yet. We'll extract the actual vptr in | |
7274 | binfo_ctor_vtable after everything's been set up. */ | |
7275 | vtbl = last; | |
13de7ec4 | 7276 | |
049d2def | 7277 | /* Otherwise, this is case 3 and we get our own. */ |
9965d119 | 7278 | } |
dbbf88d1 | 7279 | else if (!BINFO_NEW_VTABLE_MARKED (orig_binfo)) |
9965d119 | 7280 | return inits; |
7bdcf888 | 7281 | |
9965d119 | 7282 | if (!vtbl) |
ca36f057 | 7283 | { |
c35cce41 MM |
7284 | tree index; |
7285 | int non_fn_entries; | |
7286 | ||
7287 | /* Compute the initializer for this vtable. */ | |
23656158 | 7288 | inits = build_vtbl_initializer (binfo, orig_binfo, t, rtti_binfo, |
aabb4cd6 | 7289 | &non_fn_entries); |
c35cce41 | 7290 | |
23656158 | 7291 | /* Figure out the position to which the VPTR should point. */ |
c35cce41 MM |
7292 | vtbl = TREE_PURPOSE (l); |
7293 | vtbl = build1 (ADDR_EXPR, | |
23656158 | 7294 | vtbl_ptr_type_node, |
c35cce41 | 7295 | vtbl); |
90ecce3e | 7296 | TREE_CONSTANT (vtbl) = 1; |
c35cce41 MM |
7297 | index = size_binop (PLUS_EXPR, |
7298 | size_int (non_fn_entries), | |
7299 | size_int (list_length (TREE_VALUE (l)))); | |
23656158 MM |
7300 | index = size_binop (MULT_EXPR, |
7301 | TYPE_SIZE_UNIT (vtable_entry_type), | |
7302 | index); | |
7303 | vtbl = build (PLUS_EXPR, TREE_TYPE (vtbl), vtbl, index); | |
7304 | TREE_CONSTANT (vtbl) = 1; | |
9965d119 | 7305 | } |
23656158 | 7306 | |
7bdcf888 | 7307 | if (ctor_vtbl_p) |
9965d119 NS |
7308 | /* For a construction vtable, we can't overwrite BINFO_VTABLE. |
7309 | So, we make a TREE_LIST. Later, dfs_fixup_binfo_vtbls will | |
7310 | straighten this out. */ | |
7311 | BINFO_VTABLE (binfo) = tree_cons (rtti_binfo, vtbl, BINFO_VTABLE (binfo)); | |
7bdcf888 NS |
7312 | else if (BINFO_PRIMARY_P (binfo) && TREE_VIA_VIRTUAL (binfo)) |
7313 | inits = NULL_TREE; | |
7314 | else | |
7315 | /* For an ordinary vtable, set BINFO_VTABLE. */ | |
7316 | BINFO_VTABLE (binfo) = vtbl; | |
ca36f057 | 7317 | |
23656158 | 7318 | return inits; |
ca36f057 MM |
7319 | } |
7320 | ||
90ecce3e | 7321 | /* Construct the initializer for BINFO's virtual function table. BINFO |
aabb4cd6 | 7322 | is part of the hierarchy dominated by T. If we're building a |
23656158 | 7323 | construction vtable, the ORIG_BINFO is the binfo we should use to |
9965d119 NS |
7324 | find the actual function pointers to put in the vtable - but they |
7325 | can be overridden on the path to most-derived in the graph that | |
7326 | ORIG_BINFO belongs. Otherwise, | |
911a71a7 | 7327 | ORIG_BINFO should be the same as BINFO. The RTTI_BINFO is the |
23656158 MM |
7328 | BINFO that should be indicated by the RTTI information in the |
7329 | vtable; it will be a base class of T, rather than T itself, if we | |
7330 | are building a construction vtable. | |
aabb4cd6 MM |
7331 | |
7332 | The value returned is a TREE_LIST suitable for wrapping in a | |
7333 | CONSTRUCTOR to use as the DECL_INITIAL for a vtable. If | |
7334 | NON_FN_ENTRIES_P is not NULL, *NON_FN_ENTRIES_P is set to the | |
911a71a7 MM |
7335 | number of non-function entries in the vtable. |
7336 | ||
7337 | It might seem that this function should never be called with a | |
9965d119 | 7338 | BINFO for which BINFO_PRIMARY_P holds, the vtable for such a |
911a71a7 | 7339 | base is always subsumed by a derived class vtable. However, when |
9965d119 | 7340 | we are building construction vtables, we do build vtables for |
911a71a7 MM |
7341 | primary bases; we need these while the primary base is being |
7342 | constructed. */ | |
ca36f057 MM |
7343 | |
7344 | static tree | |
94edc4ab NN |
7345 | build_vtbl_initializer (tree binfo, |
7346 | tree orig_binfo, | |
7347 | tree t, | |
7348 | tree rtti_binfo, | |
7349 | int* non_fn_entries_p) | |
ca36f057 | 7350 | { |
d0cd8b44 | 7351 | tree v, b; |
911a71a7 | 7352 | tree vfun_inits; |
c35cce41 | 7353 | tree vbase; |
911a71a7 MM |
7354 | vtbl_init_data vid; |
7355 | ||
7356 | /* Initialize VID. */ | |
961192e1 | 7357 | memset (&vid, 0, sizeof (vid)); |
911a71a7 MM |
7358 | vid.binfo = binfo; |
7359 | vid.derived = t; | |
73ea87d7 | 7360 | vid.rtti_binfo = rtti_binfo; |
911a71a7 MM |
7361 | vid.last_init = &vid.inits; |
7362 | vid.primary_vtbl_p = (binfo == TYPE_BINFO (t)); | |
7363 | vid.ctor_vtbl_p = !same_type_p (BINFO_TYPE (rtti_binfo), t); | |
548502d3 | 7364 | vid.generate_vcall_entries = true; |
c35cce41 | 7365 | /* The first vbase or vcall offset is at index -3 in the vtable. */ |
a6f5e048 | 7366 | vid.index = ssize_int (-3 * TARGET_VTABLE_DATA_ENTRY_DISTANCE); |
c35cce41 | 7367 | |
9bab6c90 | 7368 | /* Add entries to the vtable for RTTI. */ |
73ea87d7 | 7369 | build_rtti_vtbl_entries (binfo, &vid); |
9bab6c90 | 7370 | |
b485e15b MM |
7371 | /* Create an array for keeping track of the functions we've |
7372 | processed. When we see multiple functions with the same | |
7373 | signature, we share the vcall offsets. */ | |
7374 | VARRAY_TREE_INIT (vid.fns, 32, "fns"); | |
c35cce41 | 7375 | /* Add the vcall and vbase offset entries. */ |
911a71a7 | 7376 | build_vcall_and_vbase_vtbl_entries (binfo, &vid); |
79cda2d1 | 7377 | /* Clear BINFO_VTABLE_PATH_MARKED; it's set by |
c35cce41 MM |
7378 | build_vbase_offset_vtbl_entries. */ |
7379 | for (vbase = CLASSTYPE_VBASECLASSES (t); | |
7380 | vbase; | |
7381 | vbase = TREE_CHAIN (vbase)) | |
dbbf88d1 | 7382 | BINFO_VTABLE_PATH_MARKED (TREE_VALUE (vbase)) = 0; |
ca36f057 | 7383 | |
a6f5e048 RH |
7384 | /* If the target requires padding between data entries, add that now. */ |
7385 | if (TARGET_VTABLE_DATA_ENTRY_DISTANCE > 1) | |
7386 | { | |
7387 | tree cur, *prev; | |
7388 | ||
7389 | for (prev = &vid.inits; (cur = *prev); prev = &TREE_CHAIN (cur)) | |
7390 | { | |
7391 | tree add = cur; | |
7392 | int i; | |
7393 | ||
7394 | for (i = 1; i < TARGET_VTABLE_DATA_ENTRY_DISTANCE; ++i) | |
7befdb9f | 7395 | add = tree_cons (NULL_TREE, |
2e88ae22 SE |
7396 | build1 (NOP_EXPR, vtable_entry_type, |
7397 | null_pointer_node), | |
7befdb9f | 7398 | add); |
a6f5e048 RH |
7399 | *prev = add; |
7400 | } | |
7401 | } | |
7402 | ||
c35cce41 | 7403 | if (non_fn_entries_p) |
911a71a7 | 7404 | *non_fn_entries_p = list_length (vid.inits); |
ca36f057 MM |
7405 | |
7406 | /* Go through all the ordinary virtual functions, building up | |
7407 | initializers. */ | |
c35cce41 | 7408 | vfun_inits = NULL_TREE; |
23656158 | 7409 | for (v = BINFO_VIRTUALS (orig_binfo); v; v = TREE_CHAIN (v)) |
ca36f057 MM |
7410 | { |
7411 | tree delta; | |
7412 | tree vcall_index; | |
4977bab6 | 7413 | tree fn, fn_original; |
f11ee281 | 7414 | tree init = NULL_TREE; |
73ea87d7 | 7415 | |
ca36f057 | 7416 | fn = BV_FN (v); |
07fa4878 NS |
7417 | fn_original = fn; |
7418 | if (DECL_THUNK_P (fn)) | |
4977bab6 | 7419 | { |
07fa4878 NS |
7420 | if (!DECL_NAME (fn)) |
7421 | finish_thunk (fn); | |
e00853fd | 7422 | if (THUNK_ALIAS (fn)) |
bb885938 NS |
7423 | { |
7424 | fn = THUNK_ALIAS (fn); | |
7425 | BV_FN (v) = fn; | |
7426 | } | |
07fa4878 | 7427 | fn_original = THUNK_TARGET (fn); |
4977bab6 ZW |
7428 | } |
7429 | ||
d0cd8b44 JM |
7430 | /* If the only definition of this function signature along our |
7431 | primary base chain is from a lost primary, this vtable slot will | |
7432 | never be used, so just zero it out. This is important to avoid | |
7433 | requiring extra thunks which cannot be generated with the function. | |
7434 | ||
f11ee281 JM |
7435 | We first check this in update_vtable_entry_for_fn, so we handle |
7436 | restored primary bases properly; we also need to do it here so we | |
7437 | zero out unused slots in ctor vtables, rather than filling themff | |
7438 | with erroneous values (though harmless, apart from relocation | |
7439 | costs). */ | |
7440 | for (b = binfo; ; b = get_primary_binfo (b)) | |
7441 | { | |
7442 | /* We found a defn before a lost primary; go ahead as normal. */ | |
4977bab6 | 7443 | if (look_for_overrides_here (BINFO_TYPE (b), fn_original)) |
f11ee281 JM |
7444 | break; |
7445 | ||
7446 | /* The nearest definition is from a lost primary; clear the | |
7447 | slot. */ | |
7448 | if (BINFO_LOST_PRIMARY_P (b)) | |
7449 | { | |
7450 | init = size_zero_node; | |
d0cd8b44 | 7451 | break; |
f11ee281 JM |
7452 | } |
7453 | } | |
d0cd8b44 | 7454 | |
f11ee281 JM |
7455 | if (! init) |
7456 | { | |
7457 | /* Pull the offset for `this', and the function to call, out of | |
7458 | the list. */ | |
7459 | delta = BV_DELTA (v); | |
548502d3 | 7460 | vcall_index = BV_VCALL_INDEX (v); |
f11ee281 JM |
7461 | |
7462 | my_friendly_assert (TREE_CODE (delta) == INTEGER_CST, 19990727); | |
7463 | my_friendly_assert (TREE_CODE (fn) == FUNCTION_DECL, 19990727); | |
7464 | ||
7465 | /* You can't call an abstract virtual function; it's abstract. | |
7466 | So, we replace these functions with __pure_virtual. */ | |
4977bab6 | 7467 | if (DECL_PURE_VIRTUAL_P (fn_original)) |
f11ee281 | 7468 | fn = abort_fndecl; |
bb5e8a7f | 7469 | else if (!integer_zerop (delta) || vcall_index) |
4977bab6 ZW |
7470 | { |
7471 | fn = make_thunk (fn, /*this_adjusting=*/1, delta, vcall_index); | |
7472 | if (!DECL_NAME (fn)) | |
07fa4878 | 7473 | finish_thunk (fn); |
4977bab6 | 7474 | } |
f11ee281 JM |
7475 | /* Take the address of the function, considering it to be of an |
7476 | appropriate generic type. */ | |
bb5e8a7f | 7477 | init = build1 (ADDR_EXPR, vfunc_ptr_type_node, fn); |
f11ee281 | 7478 | /* The address of a function can't change. */ |
bb5e8a7f | 7479 | TREE_CONSTANT (init) = 1; |
f11ee281 | 7480 | } |
d0cd8b44 | 7481 | |
ca36f057 | 7482 | /* And add it to the chain of initializers. */ |
67231816 RH |
7483 | if (TARGET_VTABLE_USES_DESCRIPTORS) |
7484 | { | |
7485 | int i; | |
7486 | if (init == size_zero_node) | |
7487 | for (i = 0; i < TARGET_VTABLE_USES_DESCRIPTORS; ++i) | |
7488 | vfun_inits = tree_cons (NULL_TREE, init, vfun_inits); | |
7489 | else | |
7490 | for (i = 0; i < TARGET_VTABLE_USES_DESCRIPTORS; ++i) | |
7491 | { | |
7492 | tree fdesc = build (FDESC_EXPR, vfunc_ptr_type_node, | |
7493 | TREE_OPERAND (init, 0), | |
7494 | build_int_2 (i, 0)); | |
7495 | TREE_CONSTANT (fdesc) = 1; | |
7496 | ||
7497 | vfun_inits = tree_cons (NULL_TREE, fdesc, vfun_inits); | |
7498 | } | |
7499 | } | |
7500 | else | |
7501 | vfun_inits = tree_cons (NULL_TREE, init, vfun_inits); | |
ca36f057 MM |
7502 | } |
7503 | ||
c35cce41 MM |
7504 | /* The initializers for virtual functions were built up in reverse |
7505 | order; straighten them out now. */ | |
7506 | vfun_inits = nreverse (vfun_inits); | |
7507 | ||
9bab6c90 | 7508 | /* The negative offset initializers are also in reverse order. */ |
911a71a7 | 7509 | vid.inits = nreverse (vid.inits); |
9bab6c90 MM |
7510 | |
7511 | /* Chain the two together. */ | |
911a71a7 | 7512 | return chainon (vid.inits, vfun_inits); |
ca36f057 MM |
7513 | } |
7514 | ||
d0cd8b44 | 7515 | /* Adds to vid->inits the initializers for the vbase and vcall |
c35cce41 | 7516 | offsets in BINFO, which is in the hierarchy dominated by T. */ |
ca36f057 | 7517 | |
c35cce41 | 7518 | static void |
94edc4ab | 7519 | build_vcall_and_vbase_vtbl_entries (tree binfo, vtbl_init_data* vid) |
ca36f057 | 7520 | { |
c35cce41 | 7521 | tree b; |
8d08fdba | 7522 | |
c35cce41 | 7523 | /* If this is a derived class, we must first create entries |
9bab6c90 | 7524 | corresponding to the primary base class. */ |
911a71a7 | 7525 | b = get_primary_binfo (binfo); |
c35cce41 | 7526 | if (b) |
911a71a7 | 7527 | build_vcall_and_vbase_vtbl_entries (b, vid); |
c35cce41 MM |
7528 | |
7529 | /* Add the vbase entries for this base. */ | |
911a71a7 | 7530 | build_vbase_offset_vtbl_entries (binfo, vid); |
c35cce41 | 7531 | /* Add the vcall entries for this base. */ |
911a71a7 | 7532 | build_vcall_offset_vtbl_entries (binfo, vid); |
ca36f057 | 7533 | } |
8d08fdba | 7534 | |
ca36f057 MM |
7535 | /* Returns the initializers for the vbase offset entries in the vtable |
7536 | for BINFO (which is part of the class hierarchy dominated by T), in | |
c35cce41 MM |
7537 | reverse order. VBASE_OFFSET_INDEX gives the vtable index |
7538 | where the next vbase offset will go. */ | |
8d08fdba | 7539 | |
c35cce41 | 7540 | static void |
94edc4ab | 7541 | build_vbase_offset_vtbl_entries (tree binfo, vtbl_init_data* vid) |
ca36f057 | 7542 | { |
c35cce41 MM |
7543 | tree vbase; |
7544 | tree t; | |
90b1ca2f | 7545 | tree non_primary_binfo; |
8d08fdba | 7546 | |
ca36f057 MM |
7547 | /* If there are no virtual baseclasses, then there is nothing to |
7548 | do. */ | |
7549 | if (!TYPE_USES_VIRTUAL_BASECLASSES (BINFO_TYPE (binfo))) | |
c35cce41 | 7550 | return; |
ca36f057 | 7551 | |
911a71a7 | 7552 | t = vid->derived; |
90b1ca2f NS |
7553 | |
7554 | /* We might be a primary base class. Go up the inheritance hierarchy | |
7555 | until we find the most derived class of which we are a primary base: | |
7556 | it is the offset of that which we need to use. */ | |
7557 | non_primary_binfo = binfo; | |
7558 | while (BINFO_INHERITANCE_CHAIN (non_primary_binfo)) | |
7559 | { | |
7560 | tree b; | |
7561 | ||
7562 | /* If we have reached a virtual base, then it must be a primary | |
7563 | base (possibly multi-level) of vid->binfo, or we wouldn't | |
7564 | have called build_vcall_and_vbase_vtbl_entries for it. But it | |
7565 | might be a lost primary, so just skip down to vid->binfo. */ | |
7566 | if (TREE_VIA_VIRTUAL (non_primary_binfo)) | |
7567 | { | |
7568 | non_primary_binfo = vid->binfo; | |
7569 | break; | |
7570 | } | |
7571 | ||
7572 | b = BINFO_INHERITANCE_CHAIN (non_primary_binfo); | |
7573 | if (get_primary_binfo (b) != non_primary_binfo) | |
7574 | break; | |
7575 | non_primary_binfo = b; | |
7576 | } | |
ca36f057 | 7577 | |
c35cce41 MM |
7578 | /* Go through the virtual bases, adding the offsets. */ |
7579 | for (vbase = TYPE_BINFO (BINFO_TYPE (binfo)); | |
7580 | vbase; | |
7581 | vbase = TREE_CHAIN (vbase)) | |
7582 | { | |
7583 | tree b; | |
7584 | tree delta; | |
7585 | ||
7586 | if (!TREE_VIA_VIRTUAL (vbase)) | |
7587 | continue; | |
ca36f057 | 7588 | |
c35cce41 MM |
7589 | /* Find the instance of this virtual base in the complete |
7590 | object. */ | |
dbbf88d1 | 7591 | b = copied_binfo (vbase, binfo); |
c35cce41 MM |
7592 | |
7593 | /* If we've already got an offset for this virtual base, we | |
7594 | don't need another one. */ | |
7595 | if (BINFO_VTABLE_PATH_MARKED (b)) | |
7596 | continue; | |
dbbf88d1 | 7597 | BINFO_VTABLE_PATH_MARKED (b) = 1; |
c35cce41 MM |
7598 | |
7599 | /* Figure out where we can find this vbase offset. */ | |
7600 | delta = size_binop (MULT_EXPR, | |
911a71a7 | 7601 | vid->index, |
c35cce41 MM |
7602 | convert (ssizetype, |
7603 | TYPE_SIZE_UNIT (vtable_entry_type))); | |
911a71a7 | 7604 | if (vid->primary_vtbl_p) |
c35cce41 MM |
7605 | BINFO_VPTR_FIELD (b) = delta; |
7606 | ||
7607 | if (binfo != TYPE_BINFO (t)) | |
7608 | { | |
c35cce41 | 7609 | /* The vbase offset had better be the same. */ |
dbbf88d1 NS |
7610 | my_friendly_assert (tree_int_cst_equal (delta, |
7611 | BINFO_VPTR_FIELD (vbase)), | |
7612 | 20030202); | |
c35cce41 MM |
7613 | } |
7614 | ||
7615 | /* The next vbase will come at a more negative offset. */ | |
a6f5e048 RH |
7616 | vid->index = size_binop (MINUS_EXPR, vid->index, |
7617 | ssize_int (TARGET_VTABLE_DATA_ENTRY_DISTANCE)); | |
c35cce41 MM |
7618 | |
7619 | /* The initializer is the delta from BINFO to this virtual base. | |
4e7512c9 MM |
7620 | The vbase offsets go in reverse inheritance-graph order, and |
7621 | we are walking in inheritance graph order so these end up in | |
7622 | the right order. */ | |
90b1ca2f NS |
7623 | delta = size_diffop (BINFO_OFFSET (b), BINFO_OFFSET (non_primary_binfo)); |
7624 | ||
911a71a7 | 7625 | *vid->last_init |
9bab6c90 MM |
7626 | = build_tree_list (NULL_TREE, |
7627 | fold (build1 (NOP_EXPR, | |
7628 | vtable_entry_type, | |
7629 | delta))); | |
911a71a7 | 7630 | vid->last_init = &TREE_CHAIN (*vid->last_init); |
c35cce41 | 7631 | } |
8d08fdba | 7632 | } |
ca36f057 | 7633 | |
b485e15b | 7634 | /* Adds the initializers for the vcall offset entries in the vtable |
d0cd8b44 JM |
7635 | for BINFO (which is part of the class hierarchy dominated by VID->DERIVED) |
7636 | to VID->INITS. */ | |
b485e15b MM |
7637 | |
7638 | static void | |
94edc4ab | 7639 | build_vcall_offset_vtbl_entries (tree binfo, vtbl_init_data* vid) |
b485e15b | 7640 | { |
548502d3 MM |
7641 | /* We only need these entries if this base is a virtual base. We |
7642 | compute the indices -- but do not add to the vtable -- when | |
7643 | building the main vtable for a class. */ | |
7644 | if (TREE_VIA_VIRTUAL (binfo) || binfo == TYPE_BINFO (vid->derived)) | |
7645 | { | |
7646 | /* We need a vcall offset for each of the virtual functions in this | |
7647 | vtable. For example: | |
b485e15b | 7648 | |
548502d3 MM |
7649 | class A { virtual void f (); }; |
7650 | class B1 : virtual public A { virtual void f (); }; | |
7651 | class B2 : virtual public A { virtual void f (); }; | |
7652 | class C: public B1, public B2 { virtual void f (); }; | |
d0cd8b44 | 7653 | |
548502d3 MM |
7654 | A C object has a primary base of B1, which has a primary base of A. A |
7655 | C also has a secondary base of B2, which no longer has a primary base | |
7656 | of A. So the B2-in-C construction vtable needs a secondary vtable for | |
7657 | A, which will adjust the A* to a B2* to call f. We have no way of | |
7658 | knowing what (or even whether) this offset will be when we define B2, | |
7659 | so we store this "vcall offset" in the A sub-vtable and look it up in | |
7660 | a "virtual thunk" for B2::f. | |
b485e15b | 7661 | |
548502d3 MM |
7662 | We need entries for all the functions in our primary vtable and |
7663 | in our non-virtual bases' secondary vtables. */ | |
7664 | vid->vbase = binfo; | |
7665 | /* If we are just computing the vcall indices -- but do not need | |
7666 | the actual entries -- not that. */ | |
7667 | if (!TREE_VIA_VIRTUAL (binfo)) | |
7668 | vid->generate_vcall_entries = false; | |
7669 | /* Now, walk through the non-virtual bases, adding vcall offsets. */ | |
7670 | add_vcall_offset_vtbl_entries_r (binfo, vid); | |
7671 | } | |
b485e15b MM |
7672 | } |
7673 | ||
7674 | /* Build vcall offsets, starting with those for BINFO. */ | |
7675 | ||
7676 | static void | |
94edc4ab | 7677 | add_vcall_offset_vtbl_entries_r (tree binfo, vtbl_init_data* vid) |
b485e15b MM |
7678 | { |
7679 | int i; | |
7680 | tree primary_binfo; | |
7681 | ||
7682 | /* Don't walk into virtual bases -- except, of course, for the | |
d0cd8b44 JM |
7683 | virtual base for which we are building vcall offsets. Any |
7684 | primary virtual base will have already had its offsets generated | |
7685 | through the recursion in build_vcall_and_vbase_vtbl_entries. */ | |
b485e15b MM |
7686 | if (TREE_VIA_VIRTUAL (binfo) && vid->vbase != binfo) |
7687 | return; | |
7688 | ||
7689 | /* If BINFO has a primary base, process it first. */ | |
7690 | primary_binfo = get_primary_binfo (binfo); | |
7691 | if (primary_binfo) | |
7692 | add_vcall_offset_vtbl_entries_r (primary_binfo, vid); | |
7693 | ||
7694 | /* Add BINFO itself to the list. */ | |
7695 | add_vcall_offset_vtbl_entries_1 (binfo, vid); | |
7696 | ||
7697 | /* Scan the non-primary bases of BINFO. */ | |
7698 | for (i = 0; i < BINFO_N_BASETYPES (binfo); ++i) | |
7699 | { | |
7700 | tree base_binfo; | |
7701 | ||
7702 | base_binfo = BINFO_BASETYPE (binfo, i); | |
7703 | if (base_binfo != primary_binfo) | |
7704 | add_vcall_offset_vtbl_entries_r (base_binfo, vid); | |
7705 | } | |
7706 | } | |
7707 | ||
9965d119 | 7708 | /* Called from build_vcall_offset_vtbl_entries_r. */ |
e92cc029 | 7709 | |
b485e15b | 7710 | static void |
94edc4ab | 7711 | add_vcall_offset_vtbl_entries_1 (tree binfo, vtbl_init_data* vid) |
8d08fdba | 7712 | { |
e6a66567 MM |
7713 | /* Make entries for the rest of the virtuals. */ |
7714 | if (abi_version_at_least (2)) | |
31f8e4f3 | 7715 | { |
e6a66567 | 7716 | tree orig_fn; |
911a71a7 | 7717 | |
e6a66567 MM |
7718 | /* The ABI requires that the methods be processed in declaration |
7719 | order. G++ 3.2 used the order in the vtable. */ | |
7720 | for (orig_fn = TYPE_METHODS (BINFO_TYPE (binfo)); | |
7721 | orig_fn; | |
7722 | orig_fn = TREE_CHAIN (orig_fn)) | |
7723 | if (DECL_VINDEX (orig_fn)) | |
95675950 | 7724 | add_vcall_offset (orig_fn, binfo, vid); |
e6a66567 MM |
7725 | } |
7726 | else | |
7727 | { | |
7728 | tree derived_virtuals; | |
7729 | tree base_virtuals; | |
7730 | tree orig_virtuals; | |
7731 | /* If BINFO is a primary base, the most derived class which has | |
7732 | BINFO as a primary base; otherwise, just BINFO. */ | |
7733 | tree non_primary_binfo; | |
7734 | ||
7735 | /* We might be a primary base class. Go up the inheritance hierarchy | |
7736 | until we find the most derived class of which we are a primary base: | |
7737 | it is the BINFO_VIRTUALS there that we need to consider. */ | |
7738 | non_primary_binfo = binfo; | |
7739 | while (BINFO_INHERITANCE_CHAIN (non_primary_binfo)) | |
911a71a7 | 7740 | { |
e6a66567 MM |
7741 | tree b; |
7742 | ||
7743 | /* If we have reached a virtual base, then it must be vid->vbase, | |
7744 | because we ignore other virtual bases in | |
7745 | add_vcall_offset_vtbl_entries_r. In turn, it must be a primary | |
7746 | base (possibly multi-level) of vid->binfo, or we wouldn't | |
7747 | have called build_vcall_and_vbase_vtbl_entries for it. But it | |
7748 | might be a lost primary, so just skip down to vid->binfo. */ | |
7749 | if (TREE_VIA_VIRTUAL (non_primary_binfo)) | |
7750 | { | |
7751 | if (non_primary_binfo != vid->vbase) | |
7752 | abort (); | |
7753 | non_primary_binfo = vid->binfo; | |
7754 | break; | |
7755 | } | |
911a71a7 | 7756 | |
e6a66567 MM |
7757 | b = BINFO_INHERITANCE_CHAIN (non_primary_binfo); |
7758 | if (get_primary_binfo (b) != non_primary_binfo) | |
7759 | break; | |
7760 | non_primary_binfo = b; | |
7761 | } | |
4e7512c9 | 7762 | |
e6a66567 MM |
7763 | if (vid->ctor_vtbl_p) |
7764 | /* For a ctor vtable we need the equivalent binfo within the hierarchy | |
7765 | where rtti_binfo is the most derived type. */ | |
dbbf88d1 NS |
7766 | non_primary_binfo |
7767 | = original_binfo (non_primary_binfo, vid->rtti_binfo); | |
e6a66567 MM |
7768 | |
7769 | for (base_virtuals = BINFO_VIRTUALS (binfo), | |
7770 | derived_virtuals = BINFO_VIRTUALS (non_primary_binfo), | |
7771 | orig_virtuals = BINFO_VIRTUALS (TYPE_BINFO (BINFO_TYPE (binfo))); | |
7772 | base_virtuals; | |
7773 | base_virtuals = TREE_CHAIN (base_virtuals), | |
7774 | derived_virtuals = TREE_CHAIN (derived_virtuals), | |
7775 | orig_virtuals = TREE_CHAIN (orig_virtuals)) | |
7776 | { | |
7777 | tree orig_fn; | |
73ea87d7 | 7778 | |
e6a66567 MM |
7779 | /* Find the declaration that originally caused this function to |
7780 | be present in BINFO_TYPE (binfo). */ | |
7781 | orig_fn = BV_FN (orig_virtuals); | |
9bab6c90 | 7782 | |
e6a66567 MM |
7783 | /* When processing BINFO, we only want to generate vcall slots for |
7784 | function slots introduced in BINFO. So don't try to generate | |
7785 | one if the function isn't even defined in BINFO. */ | |
7786 | if (!same_type_p (DECL_CONTEXT (orig_fn), BINFO_TYPE (binfo))) | |
7787 | continue; | |
b485e15b | 7788 | |
95675950 | 7789 | add_vcall_offset (orig_fn, binfo, vid); |
e6a66567 MM |
7790 | } |
7791 | } | |
7792 | } | |
b485e15b | 7793 | |
95675950 | 7794 | /* Add a vcall offset entry for ORIG_FN to the vtable. */ |
b485e15b | 7795 | |
e6a66567 | 7796 | static void |
95675950 | 7797 | add_vcall_offset (tree orig_fn, tree binfo, vtbl_init_data *vid) |
e6a66567 MM |
7798 | { |
7799 | size_t i; | |
7800 | tree vcall_offset; | |
9bab6c90 | 7801 | |
e6a66567 MM |
7802 | /* If there is already an entry for a function with the same |
7803 | signature as FN, then we do not need a second vcall offset. | |
7804 | Check the list of functions already present in the derived | |
7805 | class vtable. */ | |
7806 | for (i = 0; i < VARRAY_ACTIVE_SIZE (vid->fns); ++i) | |
7807 | { | |
7808 | tree derived_entry; | |
aabb4cd6 | 7809 | |
e6a66567 MM |
7810 | derived_entry = VARRAY_TREE (vid->fns, i); |
7811 | if (same_signature_p (derived_entry, orig_fn) | |
7812 | /* We only use one vcall offset for virtual destructors, | |
7813 | even though there are two virtual table entries. */ | |
7814 | || (DECL_DESTRUCTOR_P (derived_entry) | |
7815 | && DECL_DESTRUCTOR_P (orig_fn))) | |
7816 | return; | |
7817 | } | |
4e7512c9 | 7818 | |
e6a66567 MM |
7819 | /* If we are building these vcall offsets as part of building |
7820 | the vtable for the most derived class, remember the vcall | |
7821 | offset. */ | |
7822 | if (vid->binfo == TYPE_BINFO (vid->derived)) | |
7823 | CLASSTYPE_VCALL_INDICES (vid->derived) | |
7824 | = tree_cons (orig_fn, vid->index, | |
7825 | CLASSTYPE_VCALL_INDICES (vid->derived)); | |
548502d3 | 7826 | |
e6a66567 MM |
7827 | /* The next vcall offset will be found at a more negative |
7828 | offset. */ | |
7829 | vid->index = size_binop (MINUS_EXPR, vid->index, | |
7830 | ssize_int (TARGET_VTABLE_DATA_ENTRY_DISTANCE)); | |
7831 | ||
7832 | /* Keep track of this function. */ | |
7833 | VARRAY_PUSH_TREE (vid->fns, orig_fn); | |
7834 | ||
7835 | if (vid->generate_vcall_entries) | |
7836 | { | |
7837 | tree base; | |
e6a66567 | 7838 | tree fn; |
548502d3 | 7839 | |
e6a66567 | 7840 | /* Find the overriding function. */ |
95675950 | 7841 | fn = find_final_overrider (vid->rtti_binfo, binfo, orig_fn); |
e6a66567 MM |
7842 | if (fn == error_mark_node) |
7843 | vcall_offset = build1 (NOP_EXPR, vtable_entry_type, | |
7844 | integer_zero_node); | |
7845 | else | |
7846 | { | |
95675950 MM |
7847 | base = TREE_VALUE (fn); |
7848 | ||
7849 | /* The vbase we're working on is a primary base of | |
7850 | vid->binfo. But it might be a lost primary, so its | |
7851 | BINFO_OFFSET might be wrong, so we just use the | |
7852 | BINFO_OFFSET from vid->binfo. */ | |
7853 | vcall_offset = size_diffop (BINFO_OFFSET (base), | |
7854 | BINFO_OFFSET (vid->binfo)); | |
548502d3 MM |
7855 | vcall_offset = fold (build1 (NOP_EXPR, vtable_entry_type, |
7856 | vcall_offset)); | |
548502d3 | 7857 | } |
34cd5ae7 | 7858 | /* Add the initializer to the vtable. */ |
e6a66567 MM |
7859 | *vid->last_init = build_tree_list (NULL_TREE, vcall_offset); |
7860 | vid->last_init = &TREE_CHAIN (*vid->last_init); | |
c35cce41 | 7861 | } |
570221c2 | 7862 | } |
b54ccf71 | 7863 | |
34cd5ae7 | 7864 | /* Return vtbl initializers for the RTTI entries corresponding to the |
aabb4cd6 | 7865 | BINFO's vtable. The RTTI entries should indicate the object given |
73ea87d7 | 7866 | by VID->rtti_binfo. */ |
b54ccf71 | 7867 | |
9bab6c90 | 7868 | static void |
94edc4ab | 7869 | build_rtti_vtbl_entries (tree binfo, vtbl_init_data* vid) |
b54ccf71 | 7870 | { |
ca36f057 | 7871 | tree b; |
aabb4cd6 | 7872 | tree t; |
ca36f057 | 7873 | tree basetype; |
ca36f057 MM |
7874 | tree offset; |
7875 | tree decl; | |
7876 | tree init; | |
b54ccf71 | 7877 | |
ca36f057 | 7878 | basetype = BINFO_TYPE (binfo); |
73ea87d7 | 7879 | t = BINFO_TYPE (vid->rtti_binfo); |
b54ccf71 | 7880 | |
ca36f057 MM |
7881 | /* To find the complete object, we will first convert to our most |
7882 | primary base, and then add the offset in the vtbl to that value. */ | |
7883 | b = binfo; | |
9965d119 NS |
7884 | while (CLASSTYPE_HAS_PRIMARY_BASE_P (BINFO_TYPE (b)) |
7885 | && !BINFO_LOST_PRIMARY_P (b)) | |
b54ccf71 | 7886 | { |
c35cce41 MM |
7887 | tree primary_base; |
7888 | ||
911a71a7 | 7889 | primary_base = get_primary_binfo (b); |
9965d119 | 7890 | my_friendly_assert (BINFO_PRIMARY_BASE_OF (primary_base) == b, 20010127); |
c35cce41 | 7891 | b = primary_base; |
b54ccf71 | 7892 | } |
73ea87d7 | 7893 | offset = size_diffop (BINFO_OFFSET (vid->rtti_binfo), BINFO_OFFSET (b)); |
8f032717 | 7894 | |
8fa33dfa MM |
7895 | /* The second entry is the address of the typeinfo object. */ |
7896 | if (flag_rtti) | |
7993382e | 7897 | decl = build_address (get_tinfo_decl (t)); |
ca36f057 | 7898 | else |
8fa33dfa MM |
7899 | decl = integer_zero_node; |
7900 | ||
7901 | /* Convert the declaration to a type that can be stored in the | |
7902 | vtable. */ | |
7993382e | 7903 | init = build_nop (vfunc_ptr_type_node, decl); |
911a71a7 MM |
7904 | *vid->last_init = build_tree_list (NULL_TREE, init); |
7905 | vid->last_init = &TREE_CHAIN (*vid->last_init); | |
8f032717 | 7906 | |
c35cce41 | 7907 | /* Add the offset-to-top entry. It comes earlier in the vtable that |
c4372ef4 NS |
7908 | the the typeinfo entry. Convert the offset to look like a |
7909 | function pointer, so that we can put it in the vtable. */ | |
7993382e | 7910 | init = build_nop (vfunc_ptr_type_node, offset); |
c4372ef4 NS |
7911 | *vid->last_init = build_tree_list (NULL_TREE, init); |
7912 | vid->last_init = &TREE_CHAIN (*vid->last_init); | |
8f032717 | 7913 | } |