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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 *); | |
132 | static tree resolve_address_of_overloaded_function (tree, tree, int, | |
133 | int, int, 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 NN |
168 | static void dump_class_hierarchy (tree); |
169 | static void dump_array (FILE *, tree); | |
170 | static void dump_vtable (tree, tree, tree); | |
171 | static void dump_vtt (tree, tree); | |
172 | static tree build_vtable (tree, tree, tree); | |
173 | static void initialize_vtable (tree, tree); | |
174 | static void initialize_array (tree, tree); | |
175 | static void layout_nonempty_base_or_field (record_layout_info, | |
176 | tree, tree, splay_tree); | |
177 | static tree end_of_class (tree, int); | |
dbbf88d1 | 178 | static bool layout_empty_base (tree, tree, splay_tree); |
94edc4ab NN |
179 | static void accumulate_vtbl_inits (tree, tree, tree, tree, tree); |
180 | static tree dfs_accumulate_vtbl_inits (tree, tree, tree, tree, | |
181 | tree); | |
182 | static void build_rtti_vtbl_entries (tree, vtbl_init_data *); | |
183 | static void build_vcall_and_vbase_vtbl_entries (tree, | |
184 | vtbl_init_data *); | |
94edc4ab | 185 | static void mark_primary_bases (tree); |
94edc4ab NN |
186 | static void clone_constructors_and_destructors (tree); |
187 | static tree build_clone (tree, tree); | |
a2ddc397 | 188 | static void update_vtable_entry_for_fn (tree, tree, tree, tree *, unsigned); |
94edc4ab NN |
189 | static tree copy_virtuals (tree); |
190 | static void build_ctor_vtbl_group (tree, tree); | |
191 | static void build_vtt (tree); | |
192 | static tree binfo_ctor_vtable (tree); | |
193 | static tree *build_vtt_inits (tree, tree, tree *, tree *); | |
194 | static tree dfs_build_secondary_vptr_vtt_inits (tree, void *); | |
dbbf88d1 | 195 | static tree dfs_ctor_vtable_bases_queue_p (tree, int, void *data); |
94edc4ab | 196 | static tree dfs_fixup_binfo_vtbls (tree, void *); |
94edc4ab NN |
197 | static int record_subobject_offset (tree, tree, splay_tree); |
198 | static int check_subobject_offset (tree, tree, splay_tree); | |
199 | static int walk_subobject_offsets (tree, subobject_offset_fn, | |
200 | tree, splay_tree, tree, int); | |
201 | static void record_subobject_offsets (tree, tree, splay_tree, int); | |
202 | static int layout_conflict_p (tree, tree, splay_tree, int); | |
203 | static int splay_tree_compare_integer_csts (splay_tree_key k1, | |
204 | splay_tree_key k2); | |
205 | static void warn_about_ambiguous_bases (tree); | |
206 | static bool type_requires_array_cookie (tree); | |
956d9305 | 207 | static bool contains_empty_class_p (tree); |
9368208b | 208 | static bool base_derived_from (tree, tree); |
7ba539c6 | 209 | static int empty_base_at_nonzero_offset_p (tree, tree, splay_tree); |
ba9a991f | 210 | static tree end_of_base (tree); |
548502d3 | 211 | static tree get_vcall_index (tree, tree); |
9965d119 NS |
212 | |
213 | /* Macros for dfs walking during vtt construction. See | |
214 | dfs_ctor_vtable_bases_queue_p, dfs_build_secondary_vptr_vtt_inits | |
215 | and dfs_fixup_binfo_vtbls. */ | |
12f50451 GS |
216 | #define VTT_TOP_LEVEL_P(NODE) TREE_UNSIGNED (NODE) |
217 | #define VTT_MARKED_BINFO_P(NODE) TREE_USED (NODE) | |
9965d119 | 218 | |
51c184be | 219 | /* Variables shared between class.c and call.c. */ |
8d08fdba | 220 | |
5566b478 | 221 | #ifdef GATHER_STATISTICS |
8d08fdba MS |
222 | int n_vtables = 0; |
223 | int n_vtable_entries = 0; | |
224 | int n_vtable_searches = 0; | |
225 | int n_vtable_elems = 0; | |
226 | int n_convert_harshness = 0; | |
227 | int n_compute_conversion_costs = 0; | |
228 | int n_build_method_call = 0; | |
229 | int n_inner_fields_searched = 0; | |
5566b478 | 230 | #endif |
8d08fdba | 231 | |
338d90b8 NS |
232 | /* Convert to or from a base subobject. EXPR is an expression of type |
233 | `A' or `A*', an expression of type `B' or `B*' is returned. To | |
234 | convert A to a base B, CODE is PLUS_EXPR and BINFO is the binfo for | |
235 | the B base instance within A. To convert base A to derived B, CODE | |
236 | is MINUS_EXPR and BINFO is the binfo for the A instance within B. | |
237 | In this latter case, A must not be a morally virtual base of B. | |
238 | NONNULL is true if EXPR is known to be non-NULL (this is only | |
239 | needed when EXPR is of pointer type). CV qualifiers are preserved | |
240 | from EXPR. */ | |
ca36f057 MM |
241 | |
242 | tree | |
94edc4ab NN |
243 | build_base_path (enum tree_code code, |
244 | tree expr, | |
245 | tree binfo, | |
246 | int nonnull) | |
1a588ad7 | 247 | { |
338d90b8 | 248 | tree v_binfo = NULL_TREE; |
6bc34b14 | 249 | tree d_binfo = NULL_TREE; |
338d90b8 NS |
250 | tree probe; |
251 | tree offset; | |
252 | tree target_type; | |
253 | tree null_test = NULL; | |
254 | tree ptr_target_type; | |
ca36f057 | 255 | int fixed_type_p; |
338d90b8 | 256 | int want_pointer = TREE_CODE (TREE_TYPE (expr)) == POINTER_TYPE; |
1a588ad7 | 257 | |
338d90b8 NS |
258 | if (expr == error_mark_node || binfo == error_mark_node || !binfo) |
259 | return error_mark_node; | |
6bc34b14 JM |
260 | |
261 | for (probe = binfo; probe; probe = BINFO_INHERITANCE_CHAIN (probe)) | |
262 | { | |
263 | d_binfo = probe; | |
264 | if (!v_binfo && TREE_VIA_VIRTUAL (probe)) | |
265 | v_binfo = probe; | |
266 | } | |
338d90b8 NS |
267 | |
268 | probe = TYPE_MAIN_VARIANT (TREE_TYPE (expr)); | |
269 | if (want_pointer) | |
270 | probe = TYPE_MAIN_VARIANT (TREE_TYPE (probe)); | |
271 | ||
272 | my_friendly_assert (code == MINUS_EXPR | |
273 | ? same_type_p (BINFO_TYPE (binfo), probe) | |
274 | : code == PLUS_EXPR | |
6bc34b14 | 275 | ? same_type_p (BINFO_TYPE (d_binfo), probe) |
338d90b8 NS |
276 | : false, 20010723); |
277 | ||
278 | if (code == MINUS_EXPR && v_binfo) | |
279 | { | |
33bd39a2 | 280 | error ("cannot convert from base `%T' to derived type `%T' via virtual base `%T'", |
6bc34b14 | 281 | BINFO_TYPE (binfo), BINFO_TYPE (d_binfo), BINFO_TYPE (v_binfo)); |
338d90b8 NS |
282 | return error_mark_node; |
283 | } | |
1a588ad7 | 284 | |
f576dfc4 JM |
285 | if (!want_pointer) |
286 | /* This must happen before the call to save_expr. */ | |
287 | expr = build_unary_op (ADDR_EXPR, expr, 0); | |
288 | ||
ca36f057 | 289 | fixed_type_p = resolves_to_fixed_type_p (expr, &nonnull); |
f2606a97 | 290 | if (fixed_type_p <= 0 && TREE_SIDE_EFFECTS (expr)) |
ca36f057 | 291 | expr = save_expr (expr); |
f2606a97 | 292 | |
f576dfc4 | 293 | if (want_pointer && !nonnull) |
338d90b8 NS |
294 | null_test = build (EQ_EXPR, boolean_type_node, expr, integer_zero_node); |
295 | ||
296 | offset = BINFO_OFFSET (binfo); | |
297 | ||
f2606a97 | 298 | if (v_binfo && fixed_type_p <= 0) |
1a588ad7 | 299 | { |
338d90b8 | 300 | /* Going via virtual base V_BINFO. We need the static offset |
6bc34b14 JM |
301 | from V_BINFO to BINFO, and the dynamic offset from D_BINFO to |
302 | V_BINFO. That offset is an entry in D_BINFO's vtable. */ | |
1f5a253a NS |
303 | tree v_offset; |
304 | ||
305 | if (fixed_type_p < 0 && in_base_initializer) | |
306 | { | |
307 | /* In a base member initializer, we cannot rely on | |
308 | the vtable being set up. We have to use the vtt_parm. */ | |
309 | tree derived = BINFO_INHERITANCE_CHAIN (v_binfo); | |
310 | ||
311 | v_offset = build (PLUS_EXPR, TREE_TYPE (current_vtt_parm), | |
312 | current_vtt_parm, BINFO_VPTR_INDEX (derived)); | |
313 | ||
314 | v_offset = build1 (INDIRECT_REF, | |
315 | TREE_TYPE (TYPE_VFIELD (BINFO_TYPE (derived))), | |
316 | v_offset); | |
317 | ||
318 | } | |
319 | else | |
320 | v_offset = build_vfield_ref (build_indirect_ref (expr, NULL), | |
321 | TREE_TYPE (TREE_TYPE (expr))); | |
338d90b8 | 322 | |
338d90b8 NS |
323 | v_offset = build (PLUS_EXPR, TREE_TYPE (v_offset), |
324 | v_offset, BINFO_VPTR_FIELD (v_binfo)); | |
325 | v_offset = build1 (NOP_EXPR, | |
326 | build_pointer_type (ptrdiff_type_node), | |
327 | v_offset); | |
328 | v_offset = build_indirect_ref (v_offset, NULL); | |
f63ab951 JM |
329 | TREE_CONSTANT (v_offset) = 1; |
330 | ||
7b6d72fc MM |
331 | offset = convert_to_integer (ptrdiff_type_node, |
332 | size_diffop (offset, | |
333 | BINFO_OFFSET (v_binfo))); | |
8d08fdba | 334 | |
338d90b8 | 335 | if (!integer_zerop (offset)) |
f2606a97 JM |
336 | v_offset = build (code, ptrdiff_type_node, v_offset, offset); |
337 | ||
338 | if (fixed_type_p < 0) | |
339 | /* Negative fixed_type_p means this is a constructor or destructor; | |
340 | virtual base layout is fixed in in-charge [cd]tors, but not in | |
341 | base [cd]tors. */ | |
342 | offset = build (COND_EXPR, ptrdiff_type_node, | |
343 | build (EQ_EXPR, boolean_type_node, | |
344 | current_in_charge_parm, integer_zero_node), | |
345 | v_offset, | |
346 | BINFO_OFFSET (binfo)); | |
338d90b8 NS |
347 | else |
348 | offset = v_offset; | |
8d08fdba | 349 | } |
8d08fdba | 350 | |
6bc34b14 | 351 | target_type = code == PLUS_EXPR ? BINFO_TYPE (binfo) : BINFO_TYPE (d_binfo); |
338d90b8 NS |
352 | |
353 | target_type = cp_build_qualified_type | |
354 | (target_type, cp_type_quals (TREE_TYPE (TREE_TYPE (expr)))); | |
355 | ptr_target_type = build_pointer_type (target_type); | |
356 | if (want_pointer) | |
357 | target_type = ptr_target_type; | |
358 | ||
359 | expr = build1 (NOP_EXPR, ptr_target_type, expr); | |
fed3cef0 | 360 | |
338d90b8 NS |
361 | if (!integer_zerop (offset)) |
362 | expr = build (code, ptr_target_type, expr, offset); | |
8d08fdba | 363 | else |
338d90b8 NS |
364 | null_test = NULL; |
365 | ||
366 | if (!want_pointer) | |
367 | expr = build_indirect_ref (expr, NULL); | |
8d08fdba | 368 | |
338d90b8 NS |
369 | if (null_test) |
370 | expr = build (COND_EXPR, target_type, null_test, | |
371 | build1 (NOP_EXPR, target_type, integer_zero_node), | |
372 | expr); | |
f2606a97 | 373 | |
338d90b8 | 374 | return expr; |
8d08fdba MS |
375 | } |
376 | ||
50ad9642 MM |
377 | /* Convert OBJECT to the base TYPE. If CHECK_ACCESS is true, an error |
378 | message is emitted if TYPE is inaccessible. OBJECT is assumed to | |
379 | be non-NULL. */ | |
380 | ||
381 | tree | |
382 | convert_to_base (tree object, tree type, bool check_access) | |
383 | { | |
384 | tree binfo; | |
385 | ||
386 | binfo = lookup_base (TREE_TYPE (object), type, | |
387 | check_access ? ba_check : ba_ignore, | |
388 | NULL); | |
5bfc90de | 389 | if (!binfo || binfo == error_mark_node) |
50ad9642 MM |
390 | return error_mark_node; |
391 | ||
392 | return build_base_path (PLUS_EXPR, object, binfo, /*nonnull=*/1); | |
393 | } | |
394 | ||
22ed7e5f MM |
395 | /* EXPR is an expression with class type. BASE is a base class (a |
396 | BINFO) of that class type. Returns EXPR, converted to the BASE | |
397 | type. This function assumes that EXPR is the most derived class; | |
398 | therefore virtual bases can be found at their static offsets. */ | |
399 | ||
400 | tree | |
401 | convert_to_base_statically (tree expr, tree base) | |
402 | { | |
403 | tree expr_type; | |
404 | ||
405 | expr_type = TREE_TYPE (expr); | |
406 | if (!same_type_p (expr_type, BINFO_TYPE (base))) | |
407 | { | |
408 | tree pointer_type; | |
409 | ||
410 | pointer_type = build_pointer_type (expr_type); | |
411 | expr = build_unary_op (ADDR_EXPR, expr, /*noconvert=*/1); | |
412 | if (!integer_zerop (BINFO_OFFSET (base))) | |
413 | expr = build (PLUS_EXPR, pointer_type, expr, | |
414 | build_nop (pointer_type, BINFO_OFFSET (base))); | |
415 | expr = build_nop (build_pointer_type (BINFO_TYPE (base)), expr); | |
416 | expr = build1 (INDIRECT_REF, BINFO_TYPE (base), expr); | |
417 | } | |
418 | ||
419 | return expr; | |
420 | } | |
421 | ||
f8361147 | 422 | \f |
8d08fdba | 423 | /* Given an object INSTANCE, return an expression which yields the |
67231816 RH |
424 | vtable element corresponding to INDEX. There are many special |
425 | cases for INSTANCE which we take care of here, mainly to avoid | |
426 | creating extra tree nodes when we don't have to. */ | |
e92cc029 | 427 | |
4a8d0c9c | 428 | static tree |
94edc4ab | 429 | build_vtbl_ref_1 (tree instance, tree idx) |
8d08fdba | 430 | { |
f63ab951 JM |
431 | tree aref; |
432 | tree vtbl = NULL_TREE; | |
8d08fdba | 433 | |
f63ab951 JM |
434 | /* Try to figure out what a reference refers to, and |
435 | access its virtual function table directly. */ | |
436 | ||
437 | int cdtorp = 0; | |
438 | tree fixed_type = fixed_type_or_null (instance, NULL, &cdtorp); | |
439 | ||
ee76b931 | 440 | tree basetype = non_reference (TREE_TYPE (instance)); |
8d08fdba | 441 | |
f63ab951 | 442 | if (fixed_type && !cdtorp) |
8d08fdba | 443 | { |
f63ab951 JM |
444 | tree binfo = lookup_base (fixed_type, basetype, |
445 | ba_ignore|ba_quiet, NULL); | |
446 | if (binfo) | |
447 | vtbl = BINFO_VTABLE (binfo); | |
448 | } | |
8d08fdba | 449 | |
f63ab951 | 450 | if (!vtbl) |
dbbf88d1 NS |
451 | vtbl = build_vfield_ref (instance, basetype); |
452 | ||
e3417fcd | 453 | assemble_external (vtbl); |
a1dd0d36 | 454 | |
8d08fdba | 455 | aref = build_array_ref (vtbl, idx); |
f63ab951 | 456 | TREE_CONSTANT (aref) = 1; |
8d08fdba | 457 | |
c4372ef4 | 458 | return aref; |
8d08fdba MS |
459 | } |
460 | ||
4a8d0c9c | 461 | tree |
94edc4ab | 462 | build_vtbl_ref (tree instance, tree idx) |
4a8d0c9c RH |
463 | { |
464 | tree aref = build_vtbl_ref_1 (instance, idx); | |
465 | ||
4a8d0c9c RH |
466 | return aref; |
467 | } | |
468 | ||
67231816 RH |
469 | /* Given an object INSTANCE, return an expression which yields a |
470 | function pointer corresponding to vtable element INDEX. */ | |
471 | ||
472 | tree | |
94edc4ab | 473 | build_vfn_ref (tree instance, tree idx) |
67231816 | 474 | { |
4a8d0c9c | 475 | tree aref = build_vtbl_ref_1 (instance, idx); |
67231816 RH |
476 | |
477 | /* When using function descriptors, the address of the | |
478 | vtable entry is treated as a function pointer. */ | |
479 | if (TARGET_VTABLE_USES_DESCRIPTORS) | |
4a8d0c9c | 480 | aref = build1 (NOP_EXPR, TREE_TYPE (aref), |
67231816 RH |
481 | build_unary_op (ADDR_EXPR, aref, /*noconvert=*/1)); |
482 | ||
483 | return aref; | |
484 | } | |
485 | ||
669ec2b4 JM |
486 | /* Return the name of the virtual function table (as an IDENTIFIER_NODE) |
487 | for the given TYPE. */ | |
488 | ||
489 | static tree | |
94edc4ab | 490 | get_vtable_name (tree type) |
669ec2b4 | 491 | { |
1f84ec23 | 492 | return mangle_vtbl_for_type (type); |
669ec2b4 JM |
493 | } |
494 | ||
495 | /* Return an IDENTIFIER_NODE for the name of the virtual table table | |
496 | for TYPE. */ | |
497 | ||
498 | tree | |
94edc4ab | 499 | get_vtt_name (tree type) |
669ec2b4 | 500 | { |
1f84ec23 | 501 | return mangle_vtt_for_type (type); |
669ec2b4 JM |
502 | } |
503 | ||
459c43ad MM |
504 | /* Create a VAR_DECL for a primary or secondary vtable for CLASS_TYPE. |
505 | (For a secondary vtable for B-in-D, CLASS_TYPE should be D, not B.) | |
506 | Use NAME for the name of the vtable, and VTABLE_TYPE for its type. */ | |
b9f39201 MM |
507 | |
508 | static tree | |
94edc4ab | 509 | build_vtable (tree class_type, tree name, tree vtable_type) |
b9f39201 MM |
510 | { |
511 | tree decl; | |
512 | ||
513 | decl = build_lang_decl (VAR_DECL, name, vtable_type); | |
90ecce3e JM |
514 | /* vtable names are already mangled; give them their DECL_ASSEMBLER_NAME |
515 | now to avoid confusion in mangle_decl. */ | |
516 | SET_DECL_ASSEMBLER_NAME (decl, name); | |
b9f39201 MM |
517 | DECL_CONTEXT (decl) = class_type; |
518 | DECL_ARTIFICIAL (decl) = 1; | |
519 | TREE_STATIC (decl) = 1; | |
b9f39201 | 520 | TREE_READONLY (decl) = 1; |
b9f39201 | 521 | DECL_VIRTUAL_P (decl) = 1; |
a6f5e048 | 522 | DECL_ALIGN (decl) = TARGET_VTABLE_ENTRY_ALIGN; |
d35543c0 | 523 | DECL_VTABLE_OR_VTT_P (decl) = 1; |
a6f5e048 | 524 | |
78d55cc8 JM |
525 | /* At one time the vtable info was grabbed 2 words at a time. This |
526 | fails on sparc unless you have 8-byte alignment. (tiemann) */ | |
527 | DECL_ALIGN (decl) = MAX (TYPE_ALIGN (double_type_node), | |
528 | DECL_ALIGN (decl)); | |
529 | ||
b9f39201 MM |
530 | import_export_vtable (decl, class_type, 0); |
531 | ||
532 | return decl; | |
533 | } | |
534 | ||
1aa4ccd4 NS |
535 | /* Get the VAR_DECL of the vtable for TYPE. TYPE need not be polymorphic, |
536 | or even complete. If this does not exist, create it. If COMPLETE is | |
838dfd8a | 537 | nonzero, then complete the definition of it -- that will render it |
1aa4ccd4 NS |
538 | impossible to actually build the vtable, but is useful to get at those |
539 | which are known to exist in the runtime. */ | |
540 | ||
7d52ae23 | 541 | tree |
94edc4ab | 542 | get_vtable_decl (tree type, int complete) |
1aa4ccd4 | 543 | { |
548502d3 MM |
544 | tree decl; |
545 | ||
546 | if (CLASSTYPE_VTABLES (type)) | |
547 | return CLASSTYPE_VTABLES (type); | |
1aa4ccd4 | 548 | |
d1a74aa7 | 549 | decl = build_vtable (type, get_vtable_name (type), vtbl_type_node); |
548502d3 MM |
550 | CLASSTYPE_VTABLES (type) = decl; |
551 | ||
1aa4ccd4 | 552 | if (complete) |
217f4eb9 MM |
553 | { |
554 | DECL_EXTERNAL (decl) = 1; | |
555 | cp_finish_decl (decl, NULL_TREE, NULL_TREE, 0); | |
556 | } | |
1aa4ccd4 | 557 | |
1aa4ccd4 NS |
558 | return decl; |
559 | } | |
560 | ||
aabb4cd6 MM |
561 | /* Returns a copy of the BINFO_VIRTUALS list in BINFO. The |
562 | BV_VCALL_INDEX for each entry is cleared. */ | |
563 | ||
564 | static tree | |
94edc4ab | 565 | copy_virtuals (tree binfo) |
aabb4cd6 MM |
566 | { |
567 | tree copies; | |
568 | tree t; | |
569 | ||
570 | copies = copy_list (BINFO_VIRTUALS (binfo)); | |
571 | for (t = copies; t; t = TREE_CHAIN (t)) | |
548502d3 | 572 | BV_VCALL_INDEX (t) = NULL_TREE; |
aabb4cd6 MM |
573 | |
574 | return copies; | |
575 | } | |
85a9a0a2 | 576 | |
28531dd0 MM |
577 | /* Build the primary virtual function table for TYPE. If BINFO is |
578 | non-NULL, build the vtable starting with the initial approximation | |
579 | that it is the same as the one which is the head of the association | |
838dfd8a | 580 | list. Returns a nonzero value if a new vtable is actually |
28531dd0 | 581 | created. */ |
e92cc029 | 582 | |
28531dd0 | 583 | static int |
94edc4ab | 584 | build_primary_vtable (tree binfo, tree type) |
8d08fdba | 585 | { |
31f8e4f3 MM |
586 | tree decl; |
587 | tree virtuals; | |
8d08fdba | 588 | |
1aa4ccd4 NS |
589 | decl = get_vtable_decl (type, /*complete=*/0); |
590 | ||
8d08fdba MS |
591 | if (binfo) |
592 | { | |
dbbf88d1 | 593 | if (BINFO_NEW_VTABLE_MARKED (binfo)) |
0533d788 MM |
594 | /* We have already created a vtable for this base, so there's |
595 | no need to do it again. */ | |
28531dd0 MM |
596 | return 0; |
597 | ||
aabb4cd6 | 598 | virtuals = copy_virtuals (binfo); |
c35cce41 MM |
599 | TREE_TYPE (decl) = TREE_TYPE (get_vtbl_decl_for_binfo (binfo)); |
600 | DECL_SIZE (decl) = TYPE_SIZE (TREE_TYPE (decl)); | |
601 | DECL_SIZE_UNIT (decl) = TYPE_SIZE_UNIT (TREE_TYPE (decl)); | |
8d08fdba MS |
602 | } |
603 | else | |
604 | { | |
d1a74aa7 | 605 | my_friendly_assert (TREE_TYPE (decl) == vtbl_type_node, 20000118); |
8d08fdba | 606 | virtuals = NULL_TREE; |
8d08fdba MS |
607 | } |
608 | ||
609 | #ifdef GATHER_STATISTICS | |
610 | n_vtables += 1; | |
611 | n_vtable_elems += list_length (virtuals); | |
612 | #endif | |
613 | ||
8d08fdba MS |
614 | /* Initialize the association list for this type, based |
615 | on our first approximation. */ | |
616 | TYPE_BINFO_VTABLE (type) = decl; | |
617 | TYPE_BINFO_VIRTUALS (type) = virtuals; | |
dbbf88d1 | 618 | SET_BINFO_NEW_VTABLE_MARKED (TYPE_BINFO (type)); |
28531dd0 | 619 | return 1; |
8d08fdba MS |
620 | } |
621 | ||
3461fba7 | 622 | /* Give BINFO a new virtual function table which is initialized |
8d08fdba MS |
623 | with a skeleton-copy of its original initialization. The only |
624 | entry that changes is the `delta' entry, so we can really | |
625 | share a lot of structure. | |
626 | ||
3461fba7 | 627 | FOR_TYPE is the most derived type which caused this table to |
8d08fdba MS |
628 | be needed. |
629 | ||
838dfd8a | 630 | Returns nonzero if we haven't met BINFO before. |
2636fde4 JM |
631 | |
632 | The order in which vtables are built (by calling this function) for | |
633 | an object must remain the same, otherwise a binary incompatibility | |
634 | can result. */ | |
e92cc029 | 635 | |
28531dd0 | 636 | static int |
dbbf88d1 | 637 | build_secondary_vtable (tree binfo) |
8d08fdba | 638 | { |
dbbf88d1 | 639 | if (BINFO_NEW_VTABLE_MARKED (binfo)) |
0533d788 MM |
640 | /* We already created a vtable for this base. There's no need to |
641 | do it again. */ | |
28531dd0 | 642 | return 0; |
0533d788 | 643 | |
8d7a5379 MM |
644 | /* Remember that we've created a vtable for this BINFO, so that we |
645 | don't try to do so again. */ | |
dbbf88d1 | 646 | SET_BINFO_NEW_VTABLE_MARKED (binfo); |
8d7a5379 MM |
647 | |
648 | /* Make fresh virtual list, so we can smash it later. */ | |
aabb4cd6 | 649 | BINFO_VIRTUALS (binfo) = copy_virtuals (binfo); |
8d7a5379 | 650 | |
3461fba7 NS |
651 | /* Secondary vtables are laid out as part of the same structure as |
652 | the primary vtable. */ | |
653 | BINFO_VTABLE (binfo) = NULL_TREE; | |
28531dd0 | 654 | return 1; |
8d08fdba MS |
655 | } |
656 | ||
28531dd0 | 657 | /* Create a new vtable for BINFO which is the hierarchy dominated by |
838dfd8a | 658 | T. Return nonzero if we actually created a new vtable. */ |
28531dd0 MM |
659 | |
660 | static int | |
94edc4ab | 661 | make_new_vtable (tree t, tree binfo) |
28531dd0 MM |
662 | { |
663 | if (binfo == TYPE_BINFO (t)) | |
664 | /* In this case, it is *type*'s vtable we are modifying. We start | |
d0cd8b44 | 665 | with the approximation that its vtable is that of the |
28531dd0 | 666 | immediate base class. */ |
d0cd8b44 JM |
667 | /* ??? This actually passes TYPE_BINFO (t), not the primary base binfo, |
668 | since we've updated DECL_CONTEXT (TYPE_VFIELD (t)) by now. */ | |
669 | return build_primary_vtable (TYPE_BINFO (DECL_CONTEXT (TYPE_VFIELD (t))), | |
28531dd0 MM |
670 | t); |
671 | else | |
672 | /* This is our very own copy of `basetype' to play with. Later, | |
673 | we will fill in all the virtual functions that override the | |
674 | virtual functions in these base classes which are not defined | |
675 | by the current type. */ | |
dbbf88d1 | 676 | return build_secondary_vtable (binfo); |
28531dd0 MM |
677 | } |
678 | ||
679 | /* Make *VIRTUALS, an entry on the BINFO_VIRTUALS list for BINFO | |
680 | (which is in the hierarchy dominated by T) list FNDECL as its | |
4e7512c9 MM |
681 | BV_FN. DELTA is the required constant adjustment from the `this' |
682 | pointer where the vtable entry appears to the `this' required when | |
683 | the function is actually called. */ | |
8d08fdba MS |
684 | |
685 | static void | |
94edc4ab NN |
686 | modify_vtable_entry (tree t, |
687 | tree binfo, | |
688 | tree fndecl, | |
689 | tree delta, | |
dbbf88d1 | 690 | tree *virtuals) |
8d08fdba | 691 | { |
28531dd0 | 692 | tree v; |
c0bbf652 | 693 | |
28531dd0 | 694 | v = *virtuals; |
c0bbf652 | 695 | |
5e19c053 | 696 | if (fndecl != BV_FN (v) |
4e7512c9 | 697 | || !tree_int_cst_equal (delta, BV_DELTA (v))) |
c0bbf652 | 698 | { |
28531dd0 MM |
699 | /* We need a new vtable for BINFO. */ |
700 | if (make_new_vtable (t, binfo)) | |
701 | { | |
702 | /* If we really did make a new vtable, we also made a copy | |
703 | of the BINFO_VIRTUALS list. Now, we have to find the | |
704 | corresponding entry in that list. */ | |
705 | *virtuals = BINFO_VIRTUALS (binfo); | |
5e19c053 | 706 | while (BV_FN (*virtuals) != BV_FN (v)) |
28531dd0 MM |
707 | *virtuals = TREE_CHAIN (*virtuals); |
708 | v = *virtuals; | |
709 | } | |
8d08fdba | 710 | |
5e19c053 | 711 | BV_DELTA (v) = delta; |
aabb4cd6 | 712 | BV_VCALL_INDEX (v) = NULL_TREE; |
5e19c053 | 713 | BV_FN (v) = fndecl; |
8d08fdba | 714 | } |
8d08fdba MS |
715 | } |
716 | ||
8d08fdba | 717 | \f |
452a394b MM |
718 | /* Add method METHOD to class TYPE. If ERROR_P is true, we are adding |
719 | the method after the class has already been defined because a | |
720 | declaration for it was seen. (Even though that is erroneous, we | |
721 | add the method for improved error recovery.) */ | |
e92cc029 | 722 | |
8d08fdba | 723 | void |
94edc4ab | 724 | add_method (tree type, tree method, int error_p) |
8d08fdba | 725 | { |
aa52c1ff | 726 | int using = (DECL_CONTEXT (method) != type); |
452a394b MM |
727 | int len; |
728 | int slot; | |
729 | tree method_vec; | |
5dd236e2 NS |
730 | int template_conv_p = (TREE_CODE (method) == TEMPLATE_DECL |
731 | && DECL_TEMPLATE_CONV_FN_P (method)); | |
452a394b MM |
732 | |
733 | if (!CLASSTYPE_METHOD_VEC (type)) | |
734 | /* Make a new method vector. We start with 8 entries. We must | |
735 | allocate at least two (for constructors and destructors), and | |
736 | we're going to end up with an assignment operator at some point | |
737 | as well. | |
738 | ||
739 | We could use a TREE_LIST for now, and convert it to a TREE_VEC | |
740 | in finish_struct, but we would probably waste more memory | |
741 | making the links in the list than we would by over-allocating | |
742 | the size of the vector here. Furthermore, we would complicate | |
743 | all the code that expects this to be a vector. */ | |
744 | CLASSTYPE_METHOD_VEC (type) = make_tree_vec (8); | |
745 | ||
746 | method_vec = CLASSTYPE_METHOD_VEC (type); | |
747 | len = TREE_VEC_LENGTH (method_vec); | |
748 | ||
749 | /* Constructors and destructors go in special slots. */ | |
750 | if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (method)) | |
751 | slot = CLASSTYPE_CONSTRUCTOR_SLOT; | |
752 | else if (DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P (method)) | |
753 | slot = CLASSTYPE_DESTRUCTOR_SLOT; | |
754 | else | |
61a127b3 | 755 | { |
5dd236e2 NS |
756 | int have_template_convs_p = 0; |
757 | ||
452a394b MM |
758 | /* See if we already have an entry with this name. */ |
759 | for (slot = CLASSTYPE_FIRST_CONVERSION_SLOT; slot < len; ++slot) | |
5dd236e2 NS |
760 | { |
761 | tree m = TREE_VEC_ELT (method_vec, slot); | |
762 | ||
763 | if (!m) | |
764 | break; | |
765 | m = OVL_CURRENT (m); | |
766 | ||
767 | if (template_conv_p) | |
768 | { | |
769 | have_template_convs_p = (TREE_CODE (m) == TEMPLATE_DECL | |
770 | && DECL_TEMPLATE_CONV_FN_P (m)); | |
771 | ||
772 | /* If we need to move things up, see if there's | |
00a17e31 | 773 | space. */ |
5dd236e2 NS |
774 | if (!have_template_convs_p) |
775 | { | |
776 | slot = len - 1; | |
777 | if (TREE_VEC_ELT (method_vec, slot)) | |
778 | slot++; | |
779 | } | |
780 | break; | |
781 | } | |
782 | if (DECL_NAME (m) == DECL_NAME (method)) | |
783 | break; | |
784 | } | |
785 | ||
452a394b MM |
786 | if (slot == len) |
787 | { | |
788 | /* We need a bigger method vector. */ | |
789 | int new_len; | |
790 | tree new_vec; | |
791 | ||
792 | /* In the non-error case, we are processing a class | |
793 | definition. Double the size of the vector to give room | |
794 | for new methods. */ | |
795 | if (!error_p) | |
796 | new_len = 2 * len; | |
797 | /* In the error case, the vector is already complete. We | |
798 | don't expect many errors, and the rest of the front-end | |
799 | will get confused if there are empty slots in the vector. */ | |
800 | else | |
801 | new_len = len + 1; | |
802 | ||
803 | new_vec = make_tree_vec (new_len); | |
730e1556 KG |
804 | memcpy (&TREE_VEC_ELT (new_vec, 0), &TREE_VEC_ELT (method_vec, 0), |
805 | len * sizeof (tree)); | |
452a394b MM |
806 | len = new_len; |
807 | method_vec = CLASSTYPE_METHOD_VEC (type) = new_vec; | |
808 | } | |
61a127b3 | 809 | |
452a394b MM |
810 | if (DECL_CONV_FN_P (method) && !TREE_VEC_ELT (method_vec, slot)) |
811 | { | |
812 | /* Type conversion operators have to come before ordinary | |
813 | methods; add_conversions depends on this to speed up | |
814 | looking for conversion operators. So, if necessary, we | |
815 | slide some of the vector elements up. In theory, this | |
816 | makes this algorithm O(N^2) but we don't expect many | |
817 | conversion operators. */ | |
5dd236e2 NS |
818 | if (template_conv_p) |
819 | slot = CLASSTYPE_FIRST_CONVERSION_SLOT; | |
820 | else | |
821 | for (slot = CLASSTYPE_FIRST_CONVERSION_SLOT; slot < len; ++slot) | |
822 | { | |
823 | tree fn = TREE_VEC_ELT (method_vec, slot); | |
03017874 | 824 | |
5dd236e2 NS |
825 | if (!fn) |
826 | /* There are no more entries in the vector, so we | |
827 | can insert the new conversion operator here. */ | |
828 | break; | |
03017874 | 829 | |
5dd236e2 NS |
830 | if (!DECL_CONV_FN_P (OVL_CURRENT (fn))) |
831 | /* We can insert the new function right at the | |
832 | SLOTth position. */ | |
833 | break; | |
834 | } | |
835 | ||
836 | if (template_conv_p && have_template_convs_p) | |
837 | /*OK*/; | |
838 | else if (!TREE_VEC_ELT (method_vec, slot)) | |
452a394b MM |
839 | /* There is nothing in the Ith slot, so we can avoid |
840 | moving anything. */ | |
61a127b3 | 841 | ; |
452a394b MM |
842 | else |
843 | { | |
844 | /* We know the last slot in the vector is empty | |
845 | because we know that at this point there's room | |
846 | for a new function. */ | |
730e1556 KG |
847 | memmove (&TREE_VEC_ELT (method_vec, slot + 1), |
848 | &TREE_VEC_ELT (method_vec, slot), | |
849 | (len - slot - 1) * sizeof (tree)); | |
452a394b | 850 | TREE_VEC_ELT (method_vec, slot) = NULL_TREE; |
8d08fdba | 851 | } |
61a127b3 | 852 | } |
452a394b | 853 | } |
61a127b3 | 854 | |
452a394b MM |
855 | if (template_class_depth (type)) |
856 | /* TYPE is a template class. Don't issue any errors now; wait | |
857 | until instantiation time to complain. */ | |
858 | ; | |
859 | else | |
860 | { | |
861 | tree fns; | |
03017874 | 862 | |
452a394b MM |
863 | /* Check to see if we've already got this method. */ |
864 | for (fns = TREE_VEC_ELT (method_vec, slot); | |
865 | fns; | |
866 | fns = OVL_NEXT (fns)) | |
867 | { | |
868 | tree fn = OVL_CURRENT (fns); | |
f0ab6bf2 MM |
869 | tree parms1; |
870 | tree parms2; | |
871 | bool same = 1; | |
872 | ||
452a394b MM |
873 | if (TREE_CODE (fn) != TREE_CODE (method)) |
874 | continue; | |
03017874 | 875 | |
f0ab6bf2 MM |
876 | /* [over.load] Member function declarations with the |
877 | same name and the same parameter types cannot be | |
878 | overloaded if any of them is a static member | |
879 | function declaration. | |
880 | ||
881 | [namespace.udecl] When a using-declaration brings names | |
882 | from a base class into a derived class scope, member | |
883 | functions in the derived class override and/or hide member | |
884 | functions with the same name and parameter types in a base | |
885 | class (rather than conflicting). */ | |
886 | parms1 = TYPE_ARG_TYPES (TREE_TYPE (fn)); | |
887 | parms2 = TYPE_ARG_TYPES (TREE_TYPE (method)); | |
888 | ||
889 | /* Compare the quals on the 'this' parm. Don't compare | |
890 | the whole types, as used functions are treated as | |
891 | coming from the using class in overload resolution. */ | |
892 | if (! DECL_STATIC_FUNCTION_P (fn) | |
893 | && ! DECL_STATIC_FUNCTION_P (method) | |
894 | && (TYPE_QUALS (TREE_TYPE (TREE_VALUE (parms1))) | |
895 | != TYPE_QUALS (TREE_TYPE (TREE_VALUE (parms2))))) | |
896 | same = 0; | |
8a188e24 NS |
897 | |
898 | /* For templates, the template parms must be identical. */ | |
899 | if (TREE_CODE (fn) == TEMPLATE_DECL | |
900 | && !comp_template_parms (DECL_TEMPLATE_PARMS (fn), | |
901 | DECL_TEMPLATE_PARMS (method))) | |
902 | same = 0; | |
903 | ||
f0ab6bf2 MM |
904 | if (! DECL_STATIC_FUNCTION_P (fn)) |
905 | parms1 = TREE_CHAIN (parms1); | |
906 | if (! DECL_STATIC_FUNCTION_P (method)) | |
907 | parms2 = TREE_CHAIN (parms2); | |
908 | ||
04ec0065 MM |
909 | if (same && compparms (parms1, parms2) |
910 | && (!DECL_CONV_FN_P (fn) | |
911 | || same_type_p (TREE_TYPE (TREE_TYPE (fn)), | |
912 | TREE_TYPE (TREE_TYPE (method))))) | |
452a394b | 913 | { |
f0ab6bf2 MM |
914 | if (using && DECL_CONTEXT (fn) == type) |
915 | /* Defer to the local function. */ | |
916 | return; | |
917 | else | |
03017874 | 918 | { |
f0ab6bf2 | 919 | cp_error_at ("`%#D' and `%#D' cannot be overloaded", |
04d6ccbd | 920 | method, fn); |
f0ab6bf2 MM |
921 | |
922 | /* We don't call duplicate_decls here to merge | |
923 | the declarations because that will confuse | |
924 | things if the methods have inline | |
925 | definitions. In particular, we will crash | |
926 | while processing the definitions. */ | |
927 | return; | |
03017874 | 928 | } |
452a394b | 929 | } |
03017874 | 930 | } |
452a394b | 931 | } |
03017874 | 932 | |
452a394b MM |
933 | /* Actually insert the new method. */ |
934 | TREE_VEC_ELT (method_vec, slot) | |
935 | = build_overload (method, TREE_VEC_ELT (method_vec, slot)); | |
8f032717 | 936 | |
5dd236e2 | 937 | /* Add the new binding. */ |
452a394b MM |
938 | if (!DECL_CONSTRUCTOR_P (method) |
939 | && !DECL_DESTRUCTOR_P (method)) | |
940 | push_class_level_binding (DECL_NAME (method), | |
941 | TREE_VEC_ELT (method_vec, slot)); | |
8d08fdba MS |
942 | } |
943 | ||
944 | /* Subroutines of finish_struct. */ | |
945 | ||
946 | /* Look through the list of fields for this struct, deleting | |
947 | duplicates as we go. This must be recursive to handle | |
948 | anonymous unions. | |
949 | ||
950 | FIELD is the field which may not appear anywhere in FIELDS. | |
951 | FIELD_PTR, if non-null, is the starting point at which | |
952 | chained deletions may take place. | |
953 | The value returned is the first acceptable entry found | |
954 | in FIELDS. | |
955 | ||
956 | Note that anonymous fields which are not of UNION_TYPE are | |
957 | not duplicates, they are just anonymous fields. This happens | |
958 | when we have unnamed bitfields, for example. */ | |
e92cc029 | 959 | |
8d08fdba | 960 | static tree |
94edc4ab | 961 | delete_duplicate_fields_1 (tree field, tree fields) |
8d08fdba MS |
962 | { |
963 | tree x; | |
00595019 | 964 | tree prev = 0; |
8d08fdba MS |
965 | if (DECL_NAME (field) == 0) |
966 | { | |
6bdb8141 | 967 | if (! ANON_AGGR_TYPE_P (TREE_TYPE (field))) |
8d08fdba MS |
968 | return fields; |
969 | ||
970 | for (x = TYPE_FIELDS (TREE_TYPE (field)); x; x = TREE_CHAIN (x)) | |
00595019 | 971 | fields = delete_duplicate_fields_1 (x, fields); |
8d08fdba MS |
972 | return fields; |
973 | } | |
974 | else | |
975 | { | |
976 | for (x = fields; x; prev = x, x = TREE_CHAIN (x)) | |
977 | { | |
978 | if (DECL_NAME (x) == 0) | |
979 | { | |
6bdb8141 | 980 | if (! ANON_AGGR_TYPE_P (TREE_TYPE (x))) |
8d08fdba MS |
981 | continue; |
982 | TYPE_FIELDS (TREE_TYPE (x)) | |
00595019 | 983 | = delete_duplicate_fields_1 (field, TYPE_FIELDS (TREE_TYPE (x))); |
8d08fdba MS |
984 | if (TYPE_FIELDS (TREE_TYPE (x)) == 0) |
985 | { | |
986 | if (prev == 0) | |
987 | fields = TREE_CHAIN (fields); | |
988 | else | |
989 | TREE_CHAIN (prev) = TREE_CHAIN (x); | |
990 | } | |
991 | } | |
58010b57 | 992 | else if (TREE_CODE (field) == USING_DECL) |
3ad97789 | 993 | /* A using declaration is allowed to appear more than |
58010b57 MM |
994 | once. We'll prune these from the field list later, and |
995 | handle_using_decl will complain about invalid multiple | |
996 | uses. */ | |
997 | ; | |
998 | else if (DECL_NAME (field) == DECL_NAME (x)) | |
8d08fdba | 999 | { |
58010b57 MM |
1000 | if (TREE_CODE (field) == CONST_DECL |
1001 | && TREE_CODE (x) == CONST_DECL) | |
1002 | cp_error_at ("duplicate enum value `%D'", x); | |
1003 | else if (TREE_CODE (field) == CONST_DECL | |
1004 | || TREE_CODE (x) == CONST_DECL) | |
1005 | cp_error_at ("duplicate field `%D' (as enum and non-enum)", | |
1006 | x); | |
1007 | else if (DECL_DECLARES_TYPE_P (field) | |
1008 | && DECL_DECLARES_TYPE_P (x)) | |
8d08fdba | 1009 | { |
58010b57 MM |
1010 | if (same_type_p (TREE_TYPE (field), TREE_TYPE (x))) |
1011 | continue; | |
1012 | cp_error_at ("duplicate nested type `%D'", x); | |
8d08fdba | 1013 | } |
58010b57 MM |
1014 | else if (DECL_DECLARES_TYPE_P (field) |
1015 | || DECL_DECLARES_TYPE_P (x)) | |
1016 | { | |
1017 | /* Hide tag decls. */ | |
1018 | if ((TREE_CODE (field) == TYPE_DECL | |
1019 | && DECL_ARTIFICIAL (field)) | |
1020 | || (TREE_CODE (x) == TYPE_DECL | |
1021 | && DECL_ARTIFICIAL (x))) | |
1022 | continue; | |
1023 | cp_error_at ("duplicate field `%D' (as type and non-type)", | |
1024 | x); | |
1025 | } | |
1026 | else | |
1027 | cp_error_at ("duplicate member `%D'", x); | |
1028 | if (prev == 0) | |
1029 | fields = TREE_CHAIN (fields); | |
1030 | else | |
1031 | TREE_CHAIN (prev) = TREE_CHAIN (x); | |
8d08fdba MS |
1032 | } |
1033 | } | |
1034 | } | |
1035 | return fields; | |
1036 | } | |
1037 | ||
1038 | static void | |
94edc4ab | 1039 | delete_duplicate_fields (tree fields) |
8d08fdba MS |
1040 | { |
1041 | tree x; | |
1042 | for (x = fields; x && TREE_CHAIN (x); x = TREE_CHAIN (x)) | |
00595019 | 1043 | TREE_CHAIN (x) = delete_duplicate_fields_1 (x, TREE_CHAIN (x)); |
8d08fdba MS |
1044 | } |
1045 | ||
aa52c1ff JM |
1046 | /* Change the access of FDECL to ACCESS in T. Return 1 if change was |
1047 | legit, otherwise return 0. */ | |
e92cc029 | 1048 | |
8d08fdba | 1049 | static int |
94edc4ab | 1050 | alter_access (tree t, tree fdecl, tree access) |
8d08fdba | 1051 | { |
721c3b42 MM |
1052 | tree elem; |
1053 | ||
1054 | if (!DECL_LANG_SPECIFIC (fdecl)) | |
1055 | retrofit_lang_decl (fdecl); | |
1056 | ||
6df5158a | 1057 | my_friendly_assert (!DECL_DISCRIMINATOR_P (fdecl), 20030624); |
8e4ce833 | 1058 | |
721c3b42 | 1059 | elem = purpose_member (t, DECL_ACCESS (fdecl)); |
38afd588 | 1060 | if (elem) |
8d08fdba | 1061 | { |
38afd588 | 1062 | if (TREE_VALUE (elem) != access) |
8d08fdba | 1063 | { |
38afd588 | 1064 | if (TREE_CODE (TREE_TYPE (fdecl)) == FUNCTION_DECL) |
8251199e | 1065 | cp_error_at ("conflicting access specifications for method `%D', ignored", TREE_TYPE (fdecl)); |
38afd588 | 1066 | else |
8251199e | 1067 | error ("conflicting access specifications for field `%s', ignored", |
38afd588 | 1068 | IDENTIFIER_POINTER (DECL_NAME (fdecl))); |
8d08fdba MS |
1069 | } |
1070 | else | |
430bb96b JL |
1071 | { |
1072 | /* They're changing the access to the same thing they changed | |
1073 | it to before. That's OK. */ | |
1074 | ; | |
1075 | } | |
db5ae43f | 1076 | } |
38afd588 | 1077 | else |
8d08fdba | 1078 | { |
6df5158a | 1079 | perform_or_defer_access_check (TYPE_BINFO (t), fdecl); |
be99da77 | 1080 | DECL_ACCESS (fdecl) = tree_cons (t, access, DECL_ACCESS (fdecl)); |
8d08fdba MS |
1081 | return 1; |
1082 | } | |
1083 | return 0; | |
1084 | } | |
1085 | ||
58010b57 | 1086 | /* Process the USING_DECL, which is a member of T. */ |
79ad62b2 | 1087 | |
e9659ab0 | 1088 | static void |
94edc4ab | 1089 | handle_using_decl (tree using_decl, tree t) |
79ad62b2 MM |
1090 | { |
1091 | tree ctype = DECL_INITIAL (using_decl); | |
1092 | tree name = DECL_NAME (using_decl); | |
1093 | tree access | |
1094 | = TREE_PRIVATE (using_decl) ? access_private_node | |
1095 | : TREE_PROTECTED (using_decl) ? access_protected_node | |
1096 | : access_public_node; | |
1097 | tree fdecl, binfo; | |
1098 | tree flist = NULL_TREE; | |
aa52c1ff | 1099 | tree old_value; |
79ad62b2 | 1100 | |
3cedc9d8 MM |
1101 | if (ctype == error_mark_node) |
1102 | return; | |
1103 | ||
982216be | 1104 | binfo = lookup_base (t, ctype, ba_any, NULL); |
79ad62b2 | 1105 | if (! binfo) |
982216be MM |
1106 | { |
1107 | error_not_base_type (t, ctype); | |
1108 | return; | |
1109 | } | |
79ad62b2 | 1110 | |
8ba658ee | 1111 | if (constructor_name_p (name, ctype)) |
2036a15c | 1112 | { |
186c0fbe NS |
1113 | cp_error_at ("`%D' names constructor", using_decl); |
1114 | return; | |
1115 | } | |
8ba658ee | 1116 | if (constructor_name_p (name, t)) |
186c0fbe NS |
1117 | { |
1118 | cp_error_at ("`%D' invalid in `%T'", using_decl, t); | |
2036a15c MM |
1119 | return; |
1120 | } | |
1121 | ||
86ac0575 | 1122 | fdecl = lookup_member (binfo, name, 0, false); |
79ad62b2 MM |
1123 | |
1124 | if (!fdecl) | |
1125 | { | |
8251199e | 1126 | cp_error_at ("no members matching `%D' in `%#T'", using_decl, ctype); |
79ad62b2 MM |
1127 | return; |
1128 | } | |
1129 | ||
aa52c1ff | 1130 | if (BASELINK_P (fdecl)) |
00a17e31 | 1131 | /* Ignore base type this came from. */ |
da15dae6 | 1132 | fdecl = BASELINK_FUNCTIONS (fdecl); |
79ad62b2 | 1133 | |
aa52c1ff JM |
1134 | old_value = IDENTIFIER_CLASS_VALUE (name); |
1135 | if (old_value) | |
79ad62b2 | 1136 | { |
aa52c1ff JM |
1137 | if (is_overloaded_fn (old_value)) |
1138 | old_value = OVL_CURRENT (old_value); | |
1139 | ||
1140 | if (DECL_P (old_value) && DECL_CONTEXT (old_value) == t) | |
1141 | /* OK */; | |
1142 | else | |
1143 | old_value = NULL_TREE; | |
79ad62b2 | 1144 | } |
1c35f5b6 | 1145 | |
aa52c1ff JM |
1146 | if (is_overloaded_fn (fdecl)) |
1147 | flist = fdecl; | |
aa52c1ff JM |
1148 | |
1149 | if (! old_value) | |
1150 | ; | |
1151 | else if (is_overloaded_fn (old_value)) | |
79ad62b2 | 1152 | { |
aa52c1ff JM |
1153 | if (flist) |
1154 | /* It's OK to use functions from a base when there are functions with | |
1155 | the same name already present in the current class. */; | |
1156 | else | |
79ad62b2 | 1157 | { |
186c0fbe | 1158 | cp_error_at ("`%D' invalid in `%#T'", using_decl, t); |
aa52c1ff JM |
1159 | cp_error_at (" because of local method `%#D' with same name", |
1160 | OVL_CURRENT (old_value)); | |
1161 | return; | |
79ad62b2 MM |
1162 | } |
1163 | } | |
186c0fbe | 1164 | else if (!DECL_ARTIFICIAL (old_value)) |
aa52c1ff | 1165 | { |
186c0fbe NS |
1166 | cp_error_at ("`%D' invalid in `%#T'", using_decl, t); |
1167 | cp_error_at (" because of local member `%#D' with same name", old_value); | |
aa52c1ff JM |
1168 | return; |
1169 | } | |
1170 | ||
1171 | /* Make type T see field decl FDECL with access ACCESS.*/ | |
1172 | if (flist) | |
1173 | for (; flist; flist = OVL_NEXT (flist)) | |
1174 | { | |
452a394b | 1175 | add_method (t, OVL_CURRENT (flist), /*error_p=*/0); |
aa52c1ff JM |
1176 | alter_access (t, OVL_CURRENT (flist), access); |
1177 | } | |
1178 | else | |
1179 | alter_access (t, fdecl, access); | |
79ad62b2 | 1180 | } |
8d08fdba | 1181 | \f |
607cf131 MM |
1182 | /* Run through the base clases of T, updating |
1183 | CANT_HAVE_DEFAULT_CTOR_P, CANT_HAVE_CONST_CTOR_P, and | |
1184 | NO_CONST_ASN_REF_P. Also set flag bits in T based on properties of | |
1185 | the bases. */ | |
8d08fdba | 1186 | |
607cf131 | 1187 | static void |
94edc4ab NN |
1188 | check_bases (tree t, |
1189 | int* cant_have_default_ctor_p, | |
1190 | int* cant_have_const_ctor_p, | |
1191 | int* no_const_asn_ref_p) | |
8d08fdba | 1192 | { |
607cf131 MM |
1193 | int n_baseclasses; |
1194 | int i; | |
0fb3018c | 1195 | int seen_non_virtual_nearly_empty_base_p; |
607cf131 | 1196 | tree binfos; |
8d08fdba | 1197 | |
607cf131 MM |
1198 | binfos = TYPE_BINFO_BASETYPES (t); |
1199 | n_baseclasses = CLASSTYPE_N_BASECLASSES (t); | |
0fb3018c | 1200 | seen_non_virtual_nearly_empty_base_p = 0; |
607cf131 MM |
1201 | |
1202 | /* An aggregate cannot have baseclasses. */ | |
1203 | CLASSTYPE_NON_AGGREGATE (t) |= (n_baseclasses != 0); | |
1204 | ||
1205 | for (i = 0; i < n_baseclasses; ++i) | |
8d08fdba | 1206 | { |
607cf131 MM |
1207 | tree base_binfo; |
1208 | tree basetype; | |
8d08fdba | 1209 | |
607cf131 MM |
1210 | /* Figure out what base we're looking at. */ |
1211 | base_binfo = TREE_VEC_ELT (binfos, i); | |
1212 | basetype = TREE_TYPE (base_binfo); | |
9a71c18b | 1213 | |
607cf131 MM |
1214 | /* If the type of basetype is incomplete, then we already |
1215 | complained about that fact (and we should have fixed it up as | |
1216 | well). */ | |
d0f062fb | 1217 | if (!COMPLETE_TYPE_P (basetype)) |
8d08fdba MS |
1218 | { |
1219 | int j; | |
1220 | /* The base type is of incomplete type. It is | |
1221 | probably best to pretend that it does not | |
1222 | exist. */ | |
1223 | if (i == n_baseclasses-1) | |
1224 | TREE_VEC_ELT (binfos, i) = NULL_TREE; | |
1225 | TREE_VEC_LENGTH (binfos) -= 1; | |
1226 | n_baseclasses -= 1; | |
1227 | for (j = i; j+1 < n_baseclasses; j++) | |
1228 | TREE_VEC_ELT (binfos, j) = TREE_VEC_ELT (binfos, j+1); | |
607cf131 | 1229 | continue; |
8d08fdba MS |
1230 | } |
1231 | ||
4c6b7393 | 1232 | /* Effective C++ rule 14. We only need to check TYPE_POLYMORPHIC_P |
607cf131 MM |
1233 | here because the case of virtual functions but non-virtual |
1234 | dtor is handled in finish_struct_1. */ | |
4c6b7393 | 1235 | if (warn_ecpp && ! TYPE_POLYMORPHIC_P (basetype) |
607cf131 | 1236 | && TYPE_HAS_DESTRUCTOR (basetype)) |
33bd39a2 | 1237 | warning ("base class `%#T' has a non-virtual destructor", |
607cf131 | 1238 | basetype); |
8d08fdba | 1239 | |
607cf131 MM |
1240 | /* If the base class doesn't have copy constructors or |
1241 | assignment operators that take const references, then the | |
1242 | derived class cannot have such a member automatically | |
1243 | generated. */ | |
1244 | if (! TYPE_HAS_CONST_INIT_REF (basetype)) | |
1245 | *cant_have_const_ctor_p = 1; | |
1246 | if (TYPE_HAS_ASSIGN_REF (basetype) | |
1247 | && !TYPE_HAS_CONST_ASSIGN_REF (basetype)) | |
1248 | *no_const_asn_ref_p = 1; | |
1249 | /* Similarly, if the base class doesn't have a default | |
1250 | constructor, then the derived class won't have an | |
1251 | automatically generated default constructor. */ | |
8d08fdba MS |
1252 | if (TYPE_HAS_CONSTRUCTOR (basetype) |
1253 | && ! TYPE_HAS_DEFAULT_CONSTRUCTOR (basetype)) | |
1254 | { | |
607cf131 | 1255 | *cant_have_default_ctor_p = 1; |
8d08fdba | 1256 | if (! TYPE_HAS_CONSTRUCTOR (t)) |
33bd39a2 | 1257 | pedwarn ("base `%T' with only non-default constructor in class without a constructor", |
cb9a3ff8 | 1258 | basetype); |
8d08fdba MS |
1259 | } |
1260 | ||
0fb3018c | 1261 | if (TREE_VIA_VIRTUAL (base_binfo)) |
00a17e31 | 1262 | /* A virtual base does not effect nearly emptiness. */ |
0fb3018c | 1263 | ; |
f9c528ea | 1264 | else if (CLASSTYPE_NEARLY_EMPTY_P (basetype)) |
0fb3018c NS |
1265 | { |
1266 | if (seen_non_virtual_nearly_empty_base_p) | |
1267 | /* And if there is more than one nearly empty base, then the | |
1268 | derived class is not nearly empty either. */ | |
1269 | CLASSTYPE_NEARLY_EMPTY_P (t) = 0; | |
1270 | else | |
00a17e31 | 1271 | /* Remember we've seen one. */ |
0fb3018c NS |
1272 | seen_non_virtual_nearly_empty_base_p = 1; |
1273 | } | |
1274 | else if (!is_empty_class (basetype)) | |
1275 | /* If the base class is not empty or nearly empty, then this | |
1276 | class cannot be nearly empty. */ | |
1277 | CLASSTYPE_NEARLY_EMPTY_P (t) = 0; | |
f9c528ea | 1278 | |
607cf131 MM |
1279 | /* A lot of properties from the bases also apply to the derived |
1280 | class. */ | |
8d08fdba | 1281 | TYPE_NEEDS_CONSTRUCTING (t) |= TYPE_NEEDS_CONSTRUCTING (basetype); |
834c6dff MM |
1282 | TYPE_HAS_NONTRIVIAL_DESTRUCTOR (t) |
1283 | |= TYPE_HAS_NONTRIVIAL_DESTRUCTOR (basetype); | |
607cf131 MM |
1284 | TYPE_HAS_COMPLEX_ASSIGN_REF (t) |
1285 | |= TYPE_HAS_COMPLEX_ASSIGN_REF (basetype); | |
e8abc66f | 1286 | TYPE_HAS_COMPLEX_INIT_REF (t) |= TYPE_HAS_COMPLEX_INIT_REF (basetype); |
4c6b7393 | 1287 | TYPE_POLYMORPHIC_P (t) |= TYPE_POLYMORPHIC_P (basetype); |
5ec1192e MM |
1288 | CLASSTYPE_CONTAINS_EMPTY_CLASS_P (t) |
1289 | |= CLASSTYPE_CONTAINS_EMPTY_CLASS_P (basetype); | |
607cf131 MM |
1290 | } |
1291 | } | |
1292 | ||
9965d119 NS |
1293 | /* Set BINFO_PRIMARY_BASE_OF for all binfos in the hierarchy |
1294 | dominated by TYPE that are primary bases. */ | |
c35cce41 MM |
1295 | |
1296 | static void | |
94edc4ab | 1297 | mark_primary_bases (tree type) |
c35cce41 | 1298 | { |
9965d119 NS |
1299 | tree binfo; |
1300 | ||
1301 | /* Walk the bases in inheritance graph order. */ | |
1302 | for (binfo = TYPE_BINFO (type); binfo; binfo = TREE_CHAIN (binfo)) | |
c35cce41 | 1303 | { |
dbbf88d1 | 1304 | tree base_binfo = get_primary_binfo (binfo); |
c35cce41 | 1305 | |
dbbf88d1 NS |
1306 | if (!base_binfo) |
1307 | /* Not a dynamic base. */; | |
1308 | else if (BINFO_PRIMARY_P (base_binfo)) | |
39e78d8b | 1309 | BINFO_LOST_PRIMARY_P (binfo) = 1; |
dbbf88d1 NS |
1310 | else |
1311 | { | |
1312 | BINFO_PRIMARY_BASE_OF (base_binfo) = binfo; | |
1313 | /* A virtual binfo might have been copied from within | |
1314 | another hierarchy. As we're about to use it as a primary | |
1315 | base, make sure the offsets match. */ | |
1316 | if (TREE_VIA_VIRTUAL (base_binfo)) | |
1317 | { | |
1318 | tree delta = size_diffop (convert (ssizetype, | |
1319 | BINFO_OFFSET (binfo)), | |
1320 | convert (ssizetype, | |
1321 | BINFO_OFFSET (base_binfo))); | |
1322 | ||
1323 | propagate_binfo_offsets (base_binfo, delta); | |
1324 | } | |
1325 | } | |
c35cce41 MM |
1326 | } |
1327 | } | |
1328 | ||
911a71a7 | 1329 | /* Make the BINFO the primary base of T. */ |
607cf131 | 1330 | |
03702748 | 1331 | static void |
94edc4ab | 1332 | set_primary_base (tree t, tree binfo) |
03702748 MM |
1333 | { |
1334 | tree basetype; | |
1335 | ||
911a71a7 MM |
1336 | CLASSTYPE_PRIMARY_BINFO (t) = binfo; |
1337 | basetype = BINFO_TYPE (binfo); | |
03702748 MM |
1338 | TYPE_BINFO_VTABLE (t) = TYPE_BINFO_VTABLE (basetype); |
1339 | TYPE_BINFO_VIRTUALS (t) = TYPE_BINFO_VIRTUALS (basetype); | |
1340 | TYPE_VFIELD (t) = TYPE_VFIELD (basetype); | |
03702748 | 1341 | } |
607cf131 | 1342 | |
03702748 | 1343 | /* Determine the primary class for T. */ |
607cf131 | 1344 | |
03702748 | 1345 | static void |
94edc4ab | 1346 | determine_primary_base (tree t) |
607cf131 | 1347 | { |
607cf131 | 1348 | int i, n_baseclasses = CLASSTYPE_N_BASECLASSES (t); |
911a71a7 MM |
1349 | tree vbases; |
1350 | tree type_binfo; | |
d2c5305b | 1351 | |
8026246f MM |
1352 | /* If there are no baseclasses, there is certainly no primary base. */ |
1353 | if (n_baseclasses == 0) | |
1354 | return; | |
1355 | ||
911a71a7 | 1356 | type_binfo = TYPE_BINFO (t); |
607cf131 MM |
1357 | |
1358 | for (i = 0; i < n_baseclasses; i++) | |
1359 | { | |
911a71a7 | 1360 | tree base_binfo = BINFO_BASETYPE (type_binfo, i); |
607cf131 | 1361 | tree basetype = BINFO_TYPE (base_binfo); |
aff08c18 | 1362 | |
bbd15aac | 1363 | if (TYPE_CONTAINS_VPTR_P (basetype)) |
8d08fdba | 1364 | { |
3461fba7 NS |
1365 | /* We prefer a non-virtual base, although a virtual one will |
1366 | do. */ | |
8d08fdba MS |
1367 | if (TREE_VIA_VIRTUAL (base_binfo)) |
1368 | continue; | |
1369 | ||
03702748 | 1370 | if (!CLASSTYPE_HAS_PRIMARY_BASE_P (t)) |
8d08fdba | 1371 | { |
e93ee644 | 1372 | set_primary_base (t, base_binfo); |
03702748 | 1373 | CLASSTYPE_VFIELDS (t) = copy_list (CLASSTYPE_VFIELDS (basetype)); |
8d08fdba MS |
1374 | } |
1375 | else | |
1376 | { | |
03702748 MM |
1377 | tree vfields; |
1378 | ||
8d08fdba | 1379 | /* Only add unique vfields, and flatten them out as we go. */ |
03702748 MM |
1380 | for (vfields = CLASSTYPE_VFIELDS (basetype); |
1381 | vfields; | |
1382 | vfields = TREE_CHAIN (vfields)) | |
1383 | if (VF_BINFO_VALUE (vfields) == NULL_TREE | |
1384 | || ! TREE_VIA_VIRTUAL (VF_BINFO_VALUE (vfields))) | |
1385 | CLASSTYPE_VFIELDS (t) | |
1386 | = tree_cons (base_binfo, | |
1387 | VF_BASETYPE_VALUE (vfields), | |
1388 | CLASSTYPE_VFIELDS (t)); | |
8d08fdba MS |
1389 | } |
1390 | } | |
1391 | } | |
1392 | ||
03702748 | 1393 | if (!TYPE_VFIELD (t)) |
911a71a7 MM |
1394 | CLASSTYPE_PRIMARY_BINFO (t) = NULL_TREE; |
1395 | ||
9965d119 NS |
1396 | /* Find the indirect primary bases - those virtual bases which are primary |
1397 | bases of something else in this hierarchy. */ | |
911a71a7 MM |
1398 | for (vbases = CLASSTYPE_VBASECLASSES (t); |
1399 | vbases; | |
1400 | vbases = TREE_CHAIN (vbases)) | |
1401 | { | |
9965d119 | 1402 | tree vbase_binfo = TREE_VALUE (vbases); |
911a71a7 | 1403 | |
9965d119 NS |
1404 | /* See if this virtual base is an indirect primary base. To be so, |
1405 | it must be a primary base within the hierarchy of one of our | |
1406 | direct bases. */ | |
911a71a7 MM |
1407 | for (i = 0; i < n_baseclasses; ++i) |
1408 | { | |
9965d119 | 1409 | tree basetype = TYPE_BINFO_BASETYPE (t, i); |
911a71a7 MM |
1410 | tree v; |
1411 | ||
911a71a7 MM |
1412 | for (v = CLASSTYPE_VBASECLASSES (basetype); |
1413 | v; | |
1414 | v = TREE_CHAIN (v)) | |
1415 | { | |
9965d119 NS |
1416 | tree base_vbase = TREE_VALUE (v); |
1417 | ||
1418 | if (BINFO_PRIMARY_P (base_vbase) | |
1419 | && same_type_p (BINFO_TYPE (base_vbase), | |
1420 | BINFO_TYPE (vbase_binfo))) | |
911a71a7 | 1421 | { |
9965d119 | 1422 | BINFO_INDIRECT_PRIMARY_P (vbase_binfo) = 1; |
911a71a7 MM |
1423 | break; |
1424 | } | |
1425 | } | |
1426 | ||
1427 | /* If we've discovered that this virtual base is an indirect | |
1428 | primary base, then we can move on to the next virtual | |
1429 | base. */ | |
9965d119 | 1430 | if (BINFO_INDIRECT_PRIMARY_P (vbase_binfo)) |
911a71a7 MM |
1431 | break; |
1432 | } | |
1433 | } | |
8026246f | 1434 | |
3461fba7 NS |
1435 | /* A "nearly-empty" virtual base class can be the primary base |
1436 | class, if no non-virtual polymorphic base can be found. */ | |
1f84ec23 | 1437 | if (!CLASSTYPE_HAS_PRIMARY_BASE_P (t)) |
7cafdb8b | 1438 | { |
911a71a7 MM |
1439 | /* If not NULL, this is the best primary base candidate we have |
1440 | found so far. */ | |
1441 | tree candidate = NULL_TREE; | |
1442 | tree base_binfo; | |
7cafdb8b MM |
1443 | |
1444 | /* Loop over the baseclasses. */ | |
911a71a7 MM |
1445 | for (base_binfo = TYPE_BINFO (t); |
1446 | base_binfo; | |
1447 | base_binfo = TREE_CHAIN (base_binfo)) | |
7cafdb8b | 1448 | { |
7cafdb8b MM |
1449 | tree basetype = BINFO_TYPE (base_binfo); |
1450 | ||
1451 | if (TREE_VIA_VIRTUAL (base_binfo) | |
1452 | && CLASSTYPE_NEARLY_EMPTY_P (basetype)) | |
1453 | { | |
7cafdb8b MM |
1454 | /* If this is not an indirect primary base, then it's |
1455 | definitely our primary base. */ | |
911a71a7 | 1456 | if (!BINFO_INDIRECT_PRIMARY_P (base_binfo)) |
7cafdb8b | 1457 | { |
911a71a7 | 1458 | candidate = base_binfo; |
7cafdb8b MM |
1459 | break; |
1460 | } | |
9965d119 NS |
1461 | |
1462 | /* If this is an indirect primary base, it still could be | |
1463 | our primary base -- unless we later find there's another | |
1464 | nearly-empty virtual base that isn't an indirect | |
1465 | primary base. */ | |
1466 | if (!candidate) | |
911a71a7 | 1467 | candidate = base_binfo; |
7cafdb8b MM |
1468 | } |
1469 | } | |
1470 | ||
1471 | /* If we've got a primary base, use it. */ | |
911a71a7 | 1472 | if (candidate) |
7cafdb8b | 1473 | { |
e93ee644 | 1474 | set_primary_base (t, candidate); |
7cafdb8b | 1475 | CLASSTYPE_VFIELDS (t) |
911a71a7 | 1476 | = copy_list (CLASSTYPE_VFIELDS (BINFO_TYPE (candidate))); |
7cafdb8b MM |
1477 | } |
1478 | } | |
dd42e135 MM |
1479 | |
1480 | /* Mark the primary base classes at this point. */ | |
8026246f | 1481 | mark_primary_bases (t); |
8d08fdba | 1482 | } |
8d08fdba | 1483 | \f |
d2c5305b MM |
1484 | /* Set memoizing fields and bits of T (and its variants) for later |
1485 | use. */ | |
e92cc029 | 1486 | |
8d08fdba | 1487 | static void |
94edc4ab | 1488 | finish_struct_bits (tree t) |
8d08fdba MS |
1489 | { |
1490 | int i, n_baseclasses = CLASSTYPE_N_BASECLASSES (t); | |
8d08fdba MS |
1491 | |
1492 | /* Fix up variants (if any). */ | |
1493 | tree variants = TYPE_NEXT_VARIANT (t); | |
1494 | while (variants) | |
1495 | { | |
1496 | /* These fields are in the _TYPE part of the node, not in | |
1497 | the TYPE_LANG_SPECIFIC component, so they are not shared. */ | |
1498 | TYPE_HAS_CONSTRUCTOR (variants) = TYPE_HAS_CONSTRUCTOR (t); | |
1499 | TYPE_HAS_DESTRUCTOR (variants) = TYPE_HAS_DESTRUCTOR (t); | |
1500 | TYPE_NEEDS_CONSTRUCTING (variants) = TYPE_NEEDS_CONSTRUCTING (t); | |
834c6dff MM |
1501 | TYPE_HAS_NONTRIVIAL_DESTRUCTOR (variants) |
1502 | = TYPE_HAS_NONTRIVIAL_DESTRUCTOR (t); | |
8d08fdba | 1503 | |
4c6b7393 MM |
1504 | TYPE_BASE_CONVS_MAY_REQUIRE_CODE_P (variants) |
1505 | = TYPE_BASE_CONVS_MAY_REQUIRE_CODE_P (t); | |
1506 | TYPE_POLYMORPHIC_P (variants) = TYPE_POLYMORPHIC_P (t); | |
8d08fdba MS |
1507 | TYPE_USES_VIRTUAL_BASECLASSES (variants) = TYPE_USES_VIRTUAL_BASECLASSES (t); |
1508 | /* Copy whatever these are holding today. */ | |
1509 | TYPE_MIN_VALUE (variants) = TYPE_MIN_VALUE (t); | |
1510 | TYPE_MAX_VALUE (variants) = TYPE_MAX_VALUE (t); | |
5566b478 | 1511 | TYPE_FIELDS (variants) = TYPE_FIELDS (t); |
e92cc029 | 1512 | TYPE_SIZE (variants) = TYPE_SIZE (t); |
509087ae | 1513 | TYPE_SIZE_UNIT (variants) = TYPE_SIZE_UNIT (t); |
8d08fdba MS |
1514 | variants = TYPE_NEXT_VARIANT (variants); |
1515 | } | |
1516 | ||
d2c5305b | 1517 | if (n_baseclasses && TYPE_POLYMORPHIC_P (t)) |
fee7654e MM |
1518 | /* For a class w/o baseclasses, `finish_struct' has set |
1519 | CLASS_TYPE_ABSTRACT_VIRTUALS correctly (by | |
1520 | definition). Similarly for a class whose base classes do not | |
1521 | have vtables. When neither of these is true, we might have | |
1522 | removed abstract virtuals (by providing a definition), added | |
1523 | some (by declaring new ones), or redeclared ones from a base | |
1524 | class. We need to recalculate what's really an abstract virtual | |
1525 | at this point (by looking in the vtables). */ | |
1526 | get_pure_virtuals (t); | |
8d08fdba MS |
1527 | |
1528 | if (n_baseclasses) | |
1529 | { | |
1530 | /* Notice whether this class has type conversion functions defined. */ | |
1531 | tree binfo = TYPE_BINFO (t); | |
1532 | tree binfos = BINFO_BASETYPES (binfo); | |
1533 | tree basetype; | |
1534 | ||
1535 | for (i = n_baseclasses-1; i >= 0; i--) | |
1536 | { | |
1537 | basetype = BINFO_TYPE (TREE_VEC_ELT (binfos, i)); | |
1538 | ||
0b41abe6 | 1539 | TYPE_HAS_CONVERSION (t) |= TYPE_HAS_CONVERSION (basetype); |
8d08fdba MS |
1540 | } |
1541 | } | |
1542 | ||
ffd696af JM |
1543 | /* If this type has a copy constructor or a destructor, force its mode to |
1544 | be BLKmode, and force its TREE_ADDRESSABLE bit to be nonzero. This | |
1545 | will cause it to be passed by invisible reference and prevent it from | |
8b16faa2 MM |
1546 | being returned in a register. */ |
1547 | if (! TYPE_HAS_TRIVIAL_INIT_REF (t) || TYPE_HAS_NONTRIVIAL_DESTRUCTOR (t)) | |
8d08fdba | 1548 | { |
e8abc66f | 1549 | tree variants; |
d2e5ee5c | 1550 | DECL_MODE (TYPE_MAIN_DECL (t)) = BLKmode; |
e8abc66f | 1551 | for (variants = t; variants; variants = TYPE_NEXT_VARIANT (variants)) |
8d08fdba MS |
1552 | { |
1553 | TYPE_MODE (variants) = BLKmode; | |
1554 | TREE_ADDRESSABLE (variants) = 1; | |
8d08fdba MS |
1555 | } |
1556 | } | |
1557 | } | |
1558 | ||
b0e0b31f MM |
1559 | /* Issue warnings about T having private constructors, but no friends, |
1560 | and so forth. | |
aed7b2a6 | 1561 | |
b0e0b31f MM |
1562 | HAS_NONPRIVATE_METHOD is nonzero if T has any non-private methods or |
1563 | static members. HAS_NONPRIVATE_STATIC_FN is nonzero if T has any | |
1564 | non-private static member functions. */ | |
1565 | ||
1566 | static void | |
94edc4ab | 1567 | maybe_warn_about_overly_private_class (tree t) |
aed7b2a6 | 1568 | { |
056a3b12 MM |
1569 | int has_member_fn = 0; |
1570 | int has_nonprivate_method = 0; | |
1571 | tree fn; | |
1572 | ||
1573 | if (!warn_ctor_dtor_privacy | |
b0e0b31f MM |
1574 | /* If the class has friends, those entities might create and |
1575 | access instances, so we should not warn. */ | |
056a3b12 MM |
1576 | || (CLASSTYPE_FRIEND_CLASSES (t) |
1577 | || DECL_FRIENDLIST (TYPE_MAIN_DECL (t))) | |
b0e0b31f MM |
1578 | /* We will have warned when the template was declared; there's |
1579 | no need to warn on every instantiation. */ | |
056a3b12 MM |
1580 | || CLASSTYPE_TEMPLATE_INSTANTIATION (t)) |
1581 | /* There's no reason to even consider warning about this | |
1582 | class. */ | |
1583 | return; | |
1584 | ||
1585 | /* We only issue one warning, if more than one applies, because | |
1586 | otherwise, on code like: | |
1587 | ||
1588 | class A { | |
1589 | // Oops - forgot `public:' | |
1590 | A(); | |
1591 | A(const A&); | |
1592 | ~A(); | |
1593 | }; | |
1594 | ||
1595 | we warn several times about essentially the same problem. */ | |
1596 | ||
1597 | /* Check to see if all (non-constructor, non-destructor) member | |
1598 | functions are private. (Since there are no friends or | |
1599 | non-private statics, we can't ever call any of the private member | |
1600 | functions.) */ | |
1601 | for (fn = TYPE_METHODS (t); fn; fn = TREE_CHAIN (fn)) | |
1602 | /* We're not interested in compiler-generated methods; they don't | |
1603 | provide any way to call private members. */ | |
1604 | if (!DECL_ARTIFICIAL (fn)) | |
1605 | { | |
1606 | if (!TREE_PRIVATE (fn)) | |
b0e0b31f | 1607 | { |
056a3b12 MM |
1608 | if (DECL_STATIC_FUNCTION_P (fn)) |
1609 | /* A non-private static member function is just like a | |
1610 | friend; it can create and invoke private member | |
1611 | functions, and be accessed without a class | |
1612 | instance. */ | |
1613 | return; | |
b0e0b31f | 1614 | |
056a3b12 | 1615 | has_nonprivate_method = 1; |
f576dfc4 | 1616 | /* Keep searching for a static member function. */ |
056a3b12 | 1617 | } |
ce0a5952 | 1618 | else if (!DECL_CONSTRUCTOR_P (fn) && !DECL_DESTRUCTOR_P (fn)) |
056a3b12 MM |
1619 | has_member_fn = 1; |
1620 | } | |
aed7b2a6 | 1621 | |
056a3b12 MM |
1622 | if (!has_nonprivate_method && has_member_fn) |
1623 | { | |
ce0a5952 MM |
1624 | /* There are no non-private methods, and there's at least one |
1625 | private member function that isn't a constructor or | |
1626 | destructor. (If all the private members are | |
1627 | constructors/destructors we want to use the code below that | |
1628 | issues error messages specifically referring to | |
1629 | constructors/destructors.) */ | |
056a3b12 | 1630 | int i; |
dbbf88d1 NS |
1631 | tree binfo = TYPE_BINFO (t); |
1632 | ||
1633 | for (i = 0; i < BINFO_N_BASETYPES (binfo); i++) | |
1634 | if (BINFO_BASEACCESS (binfo, i) != access_private_node) | |
056a3b12 MM |
1635 | { |
1636 | has_nonprivate_method = 1; | |
1637 | break; | |
1638 | } | |
1639 | if (!has_nonprivate_method) | |
b0e0b31f | 1640 | { |
33bd39a2 | 1641 | warning ("all member functions in class `%T' are private", t); |
056a3b12 | 1642 | return; |
b0e0b31f | 1643 | } |
056a3b12 | 1644 | } |
aed7b2a6 | 1645 | |
056a3b12 MM |
1646 | /* Even if some of the member functions are non-private, the class |
1647 | won't be useful for much if all the constructors or destructors | |
1648 | are private: such an object can never be created or destroyed. */ | |
1649 | if (TYPE_HAS_DESTRUCTOR (t)) | |
1650 | { | |
1651 | tree dtor = TREE_VEC_ELT (CLASSTYPE_METHOD_VEC (t), 1); | |
b0e0b31f | 1652 | |
056a3b12 MM |
1653 | if (TREE_PRIVATE (dtor)) |
1654 | { | |
33bd39a2 | 1655 | warning ("`%#T' only defines a private destructor and has no friends", |
056a3b12 MM |
1656 | t); |
1657 | return; | |
b0e0b31f | 1658 | } |
056a3b12 | 1659 | } |
b0e0b31f | 1660 | |
056a3b12 MM |
1661 | if (TYPE_HAS_CONSTRUCTOR (t)) |
1662 | { | |
1663 | int nonprivate_ctor = 0; | |
b0e0b31f | 1664 | |
056a3b12 MM |
1665 | /* If a non-template class does not define a copy |
1666 | constructor, one is defined for it, enabling it to avoid | |
1667 | this warning. For a template class, this does not | |
1668 | happen, and so we would normally get a warning on: | |
b0e0b31f | 1669 | |
056a3b12 | 1670 | template <class T> class C { private: C(); }; |
b0e0b31f | 1671 | |
056a3b12 MM |
1672 | To avoid this asymmetry, we check TYPE_HAS_INIT_REF. All |
1673 | complete non-template or fully instantiated classes have this | |
1674 | flag set. */ | |
1675 | if (!TYPE_HAS_INIT_REF (t)) | |
1676 | nonprivate_ctor = 1; | |
1677 | else | |
1678 | for (fn = TREE_VEC_ELT (CLASSTYPE_METHOD_VEC (t), 0); | |
1679 | fn; | |
1680 | fn = OVL_NEXT (fn)) | |
1681 | { | |
1682 | tree ctor = OVL_CURRENT (fn); | |
1683 | /* Ideally, we wouldn't count copy constructors (or, in | |
1684 | fact, any constructor that takes an argument of the | |
1685 | class type as a parameter) because such things cannot | |
1686 | be used to construct an instance of the class unless | |
1687 | you already have one. But, for now at least, we're | |
1688 | more generous. */ | |
1689 | if (! TREE_PRIVATE (ctor)) | |
b0e0b31f | 1690 | { |
056a3b12 MM |
1691 | nonprivate_ctor = 1; |
1692 | break; | |
b0e0b31f | 1693 | } |
056a3b12 | 1694 | } |
aed7b2a6 | 1695 | |
056a3b12 MM |
1696 | if (nonprivate_ctor == 0) |
1697 | { | |
33bd39a2 | 1698 | warning ("`%#T' only defines private constructors and has no friends", |
056a3b12 MM |
1699 | t); |
1700 | return; | |
b0e0b31f MM |
1701 | } |
1702 | } | |
aed7b2a6 MM |
1703 | } |
1704 | ||
17211ab5 GK |
1705 | static struct { |
1706 | gt_pointer_operator new_value; | |
1707 | void *cookie; | |
1708 | } resort_data; | |
1709 | ||
f90cdf34 MT |
1710 | /* Comparison function to compare two TYPE_METHOD_VEC entries by name. */ |
1711 | ||
1712 | static int | |
94edc4ab | 1713 | method_name_cmp (const void* m1_p, const void* m2_p) |
f90cdf34 | 1714 | { |
17211ab5 GK |
1715 | const tree *const m1 = m1_p; |
1716 | const tree *const m2 = m2_p; | |
1717 | ||
f90cdf34 MT |
1718 | if (*m1 == NULL_TREE && *m2 == NULL_TREE) |
1719 | return 0; | |
1720 | if (*m1 == NULL_TREE) | |
1721 | return -1; | |
1722 | if (*m2 == NULL_TREE) | |
1723 | return 1; | |
1724 | if (DECL_NAME (OVL_CURRENT (*m1)) < DECL_NAME (OVL_CURRENT (*m2))) | |
1725 | return -1; | |
1726 | return 1; | |
1727 | } | |
b0e0b31f | 1728 | |
17211ab5 GK |
1729 | /* This routine compares two fields like method_name_cmp but using the |
1730 | pointer operator in resort_field_decl_data. */ | |
1731 | ||
1732 | static int | |
94edc4ab | 1733 | resort_method_name_cmp (const void* m1_p, const void* m2_p) |
17211ab5 GK |
1734 | { |
1735 | const tree *const m1 = m1_p; | |
1736 | const tree *const m2 = m2_p; | |
1737 | if (*m1 == NULL_TREE && *m2 == NULL_TREE) | |
1738 | return 0; | |
1739 | if (*m1 == NULL_TREE) | |
1740 | return -1; | |
1741 | if (*m2 == NULL_TREE) | |
1742 | return 1; | |
1743 | { | |
1744 | tree d1 = DECL_NAME (OVL_CURRENT (*m1)); | |
1745 | tree d2 = DECL_NAME (OVL_CURRENT (*m2)); | |
1746 | resort_data.new_value (&d1, resort_data.cookie); | |
1747 | resort_data.new_value (&d2, resort_data.cookie); | |
1748 | if (d1 < d2) | |
1749 | return -1; | |
1750 | } | |
1751 | return 1; | |
1752 | } | |
1753 | ||
1754 | /* Resort TYPE_METHOD_VEC because pointers have been reordered. */ | |
1755 | ||
1756 | void | |
94edc4ab NN |
1757 | resort_type_method_vec (void* obj, |
1758 | void* orig_obj ATTRIBUTE_UNUSED , | |
1759 | gt_pointer_operator new_value, | |
1760 | void* cookie) | |
17211ab5 GK |
1761 | { |
1762 | tree method_vec = obj; | |
1763 | int len = TREE_VEC_LENGTH (method_vec); | |
1764 | int slot; | |
1765 | ||
1766 | /* The type conversion ops have to live at the front of the vec, so we | |
1767 | can't sort them. */ | |
1768 | for (slot = 2; slot < len; ++slot) | |
1769 | { | |
1770 | tree fn = TREE_VEC_ELT (method_vec, slot); | |
1771 | ||
1772 | if (!DECL_CONV_FN_P (OVL_CURRENT (fn))) | |
1773 | break; | |
1774 | } | |
1775 | if (len - slot > 1) | |
1776 | { | |
1777 | resort_data.new_value = new_value; | |
1778 | resort_data.cookie = cookie; | |
1779 | qsort (&TREE_VEC_ELT (method_vec, slot), len - slot, sizeof (tree), | |
1780 | resort_method_name_cmp); | |
1781 | } | |
1782 | } | |
1783 | ||
8d08fdba MS |
1784 | /* Warn about duplicate methods in fn_fields. Also compact method |
1785 | lists so that lookup can be made faster. | |
1786 | ||
8d08fdba MS |
1787 | Data Structure: List of method lists. The outer list is a |
1788 | TREE_LIST, whose TREE_PURPOSE field is the field name and the | |
e1cd6e56 MS |
1789 | TREE_VALUE is the DECL_CHAIN of the FUNCTION_DECLs. TREE_CHAIN |
1790 | links the entire list of methods for TYPE_METHODS. Friends are | |
1791 | chained in the same way as member functions (? TREE_CHAIN or | |
1792 | DECL_CHAIN), but they live in the TREE_TYPE field of the outer | |
1793 | list. That allows them to be quickly deleted, and requires no | |
1794 | extra storage. | |
8d08fdba | 1795 | |
5b0cec3b MM |
1796 | Sort methods that are not special (i.e., constructors, destructors, |
1797 | and type conversion operators) so that we can find them faster in | |
1798 | search. */ | |
8d08fdba | 1799 | |
b0e0b31f | 1800 | static void |
94edc4ab | 1801 | finish_struct_methods (tree t) |
8d08fdba | 1802 | { |
b0e0b31f | 1803 | tree fn_fields; |
58010b57 | 1804 | tree method_vec; |
58010b57 MM |
1805 | int slot, len; |
1806 | ||
1807 | if (!TYPE_METHODS (t)) | |
1808 | { | |
1809 | /* Clear these for safety; perhaps some parsing error could set | |
1810 | these incorrectly. */ | |
1811 | TYPE_HAS_CONSTRUCTOR (t) = 0; | |
1812 | TYPE_HAS_DESTRUCTOR (t) = 0; | |
1813 | CLASSTYPE_METHOD_VEC (t) = NULL_TREE; | |
1814 | return; | |
1815 | } | |
1816 | ||
58010b57 | 1817 | method_vec = CLASSTYPE_METHOD_VEC (t); |
607cf131 | 1818 | my_friendly_assert (method_vec != NULL_TREE, 19991215); |
58010b57 | 1819 | len = TREE_VEC_LENGTH (method_vec); |
8d08fdba | 1820 | |
fc378698 MS |
1821 | /* First fill in entry 0 with the constructors, entry 1 with destructors, |
1822 | and the next few with type conversion operators (if any). */ | |
b0e0b31f MM |
1823 | for (fn_fields = TYPE_METHODS (t); fn_fields; |
1824 | fn_fields = TREE_CHAIN (fn_fields)) | |
5b0cec3b MM |
1825 | /* Clear out this flag. */ |
1826 | DECL_IN_AGGR_P (fn_fields) = 0; | |
8d08fdba | 1827 | |
0d9eb3ba | 1828 | if (TYPE_HAS_DESTRUCTOR (t) && !CLASSTYPE_DESTRUCTORS (t)) |
b0e0b31f MM |
1829 | /* We thought there was a destructor, but there wasn't. Some |
1830 | parse errors cause this anomalous situation. */ | |
1831 | TYPE_HAS_DESTRUCTOR (t) = 0; | |
1832 | ||
1833 | /* Issue warnings about private constructors and such. If there are | |
1834 | no methods, then some public defaults are generated. */ | |
f90cdf34 MT |
1835 | maybe_warn_about_overly_private_class (t); |
1836 | ||
f90cdf34 MT |
1837 | /* Now sort the methods. */ |
1838 | while (len > 2 && TREE_VEC_ELT (method_vec, len-1) == NULL_TREE) | |
1839 | len--; | |
1840 | TREE_VEC_LENGTH (method_vec) = len; | |
1841 | ||
1842 | /* The type conversion ops have to live at the front of the vec, so we | |
1843 | can't sort them. */ | |
1844 | for (slot = 2; slot < len; ++slot) | |
1845 | { | |
1846 | tree fn = TREE_VEC_ELT (method_vec, slot); | |
1847 | ||
1848 | if (!DECL_CONV_FN_P (OVL_CURRENT (fn))) | |
1849 | break; | |
1850 | } | |
1851 | if (len - slot > 1) | |
1852 | qsort (&TREE_VEC_ELT (method_vec, slot), len-slot, sizeof (tree), | |
17211ab5 | 1853 | method_name_cmp); |
8d08fdba MS |
1854 | } |
1855 | ||
90ecce3e | 1856 | /* Make BINFO's vtable have N entries, including RTTI entries, |
8d7a5379 MM |
1857 | vbase and vcall offsets, etc. Set its type and call the backend |
1858 | to lay it out. */ | |
1a588ad7 MM |
1859 | |
1860 | static void | |
94edc4ab | 1861 | layout_vtable_decl (tree binfo, int n) |
1a588ad7 | 1862 | { |
1a588ad7 | 1863 | tree atype; |
c35cce41 | 1864 | tree vtable; |
1a588ad7 | 1865 | |
1a588ad7 | 1866 | atype = build_cplus_array_type (vtable_entry_type, |
442e01b6 | 1867 | build_index_type (size_int (n - 1))); |
1a588ad7 MM |
1868 | layout_type (atype); |
1869 | ||
1870 | /* We may have to grow the vtable. */ | |
c35cce41 MM |
1871 | vtable = get_vtbl_decl_for_binfo (binfo); |
1872 | if (!same_type_p (TREE_TYPE (vtable), atype)) | |
1a588ad7 | 1873 | { |
06ceef4e | 1874 | TREE_TYPE (vtable) = atype; |
c35cce41 | 1875 | DECL_SIZE (vtable) = DECL_SIZE_UNIT (vtable) = NULL_TREE; |
06ceef4e | 1876 | layout_decl (vtable, 0); |
1a588ad7 MM |
1877 | } |
1878 | } | |
1879 | ||
9bab6c90 MM |
1880 | /* True iff FNDECL and BASE_FNDECL (both non-static member functions) |
1881 | have the same signature. */ | |
83f2ccf4 | 1882 | |
e0fff4b3 | 1883 | int |
94edc4ab | 1884 | same_signature_p (tree fndecl, tree base_fndecl) |
83f2ccf4 | 1885 | { |
872f37f9 MM |
1886 | /* One destructor overrides another if they are the same kind of |
1887 | destructor. */ | |
1888 | if (DECL_DESTRUCTOR_P (base_fndecl) && DECL_DESTRUCTOR_P (fndecl) | |
1889 | && special_function_p (base_fndecl) == special_function_p (fndecl)) | |
ca36f057 | 1890 | return 1; |
872f37f9 MM |
1891 | /* But a non-destructor never overrides a destructor, nor vice |
1892 | versa, nor do different kinds of destructors override | |
1893 | one-another. For example, a complete object destructor does not | |
1894 | override a deleting destructor. */ | |
0d9eb3ba | 1895 | if (DECL_DESTRUCTOR_P (base_fndecl) || DECL_DESTRUCTOR_P (fndecl)) |
ca36f057 | 1896 | return 0; |
872f37f9 | 1897 | |
ca36f057 | 1898 | if (DECL_NAME (fndecl) == DECL_NAME (base_fndecl)) |
83f2ccf4 | 1899 | { |
ca36f057 | 1900 | tree types, base_types; |
ca36f057 MM |
1901 | types = TYPE_ARG_TYPES (TREE_TYPE (fndecl)); |
1902 | base_types = TYPE_ARG_TYPES (TREE_TYPE (base_fndecl)); | |
1903 | if ((TYPE_QUALS (TREE_TYPE (TREE_VALUE (base_types))) | |
1904 | == TYPE_QUALS (TREE_TYPE (TREE_VALUE (types)))) | |
1905 | && compparms (TREE_CHAIN (base_types), TREE_CHAIN (types))) | |
1906 | return 1; | |
83f2ccf4 | 1907 | } |
ca36f057 | 1908 | return 0; |
83f2ccf4 MM |
1909 | } |
1910 | ||
9368208b MM |
1911 | /* Returns TRUE if DERIVED is a binfo containing the binfo BASE as a |
1912 | subobject. */ | |
1913 | ||
1914 | static bool | |
1915 | base_derived_from (tree derived, tree base) | |
1916 | { | |
dbbf88d1 NS |
1917 | tree probe; |
1918 | ||
1919 | for (probe = base; probe; probe = BINFO_INHERITANCE_CHAIN (probe)) | |
1920 | { | |
1921 | if (probe == derived) | |
1922 | return true; | |
1923 | else if (TREE_VIA_VIRTUAL (probe)) | |
1924 | /* If we meet a virtual base, we can't follow the inheritance | |
1925 | any more. See if the complete type of DERIVED contains | |
1926 | such a virtual base. */ | |
1927 | return purpose_member (BINFO_TYPE (probe), | |
1928 | CLASSTYPE_VBASECLASSES (BINFO_TYPE (derived))) | |
1929 | != NULL_TREE; | |
1930 | } | |
1931 | return false; | |
9368208b MM |
1932 | } |
1933 | ||
ca36f057 MM |
1934 | typedef struct find_final_overrider_data_s { |
1935 | /* The function for which we are trying to find a final overrider. */ | |
1936 | tree fn; | |
1937 | /* The base class in which the function was declared. */ | |
1938 | tree declaring_base; | |
1939 | /* The most derived class in the hierarchy. */ | |
1940 | tree most_derived_type; | |
9368208b | 1941 | /* The candidate overriders. */ |
78b45a24 | 1942 | tree candidates; |
dbbf88d1 NS |
1943 | /* Binfos which inherited virtually on the currrent path. */ |
1944 | tree vpath; | |
ca36f057 | 1945 | } find_final_overrider_data; |
8d7a5379 | 1946 | |
ca36f057 | 1947 | /* Called from find_final_overrider via dfs_walk. */ |
8d7a5379 MM |
1948 | |
1949 | static tree | |
94edc4ab | 1950 | dfs_find_final_overrider (tree binfo, void* data) |
7177d104 | 1951 | { |
ca36f057 | 1952 | find_final_overrider_data *ffod = (find_final_overrider_data *) data; |
3c9d6359 | 1953 | |
dbbf88d1 NS |
1954 | if (binfo == ffod->declaring_base) |
1955 | { | |
1956 | /* We've found a path to the declaring base. Walk the path from | |
1957 | derived to base, looking for an overrider for FN. */ | |
1958 | tree path, probe, vpath; | |
1959 | ||
1960 | /* Build the path, using the inheritance chain and record of | |
1961 | virtual inheritance. */ | |
1962 | for (path = NULL_TREE, probe = binfo, vpath = ffod->vpath;;) | |
8d7a5379 | 1963 | { |
dbbf88d1 NS |
1964 | path = tree_cons (NULL_TREE, probe, path); |
1965 | if (same_type_p (BINFO_TYPE (probe), ffod->most_derived_type)) | |
1966 | break; | |
1967 | if (TREE_VIA_VIRTUAL (probe)) | |
1968 | { | |
1969 | probe = TREE_VALUE (vpath); | |
1970 | vpath = TREE_CHAIN (vpath); | |
1971 | } | |
1972 | else | |
1973 | probe = BINFO_INHERITANCE_CHAIN (probe); | |
1974 | } | |
1975 | /* Now walk path, looking for overrides. */ | |
1976 | for (; path; path = TREE_CHAIN (path)) | |
1977 | { | |
1978 | tree method = look_for_overrides_here | |
1979 | (BINFO_TYPE (TREE_VALUE (path)), ffod->fn); | |
1980 | ||
5e19c053 | 1981 | if (method) |
9368208b | 1982 | { |
dbbf88d1 | 1983 | tree *candidate = &ffod->candidates; |
9368208b | 1984 | path = TREE_VALUE (path); |
dbbf88d1 NS |
1985 | |
1986 | /* Remove any candidates overridden by this new function. */ | |
1987 | while (*candidate) | |
1988 | { | |
1989 | /* If *CANDIDATE overrides METHOD, then METHOD | |
1990 | cannot override anything else on the list. */ | |
1991 | if (base_derived_from (TREE_VALUE (*candidate), path)) | |
1992 | return NULL_TREE; | |
1993 | /* If METHOD overrides *CANDIDATE, remove *CANDIDATE. */ | |
1994 | if (base_derived_from (path, TREE_VALUE (*candidate))) | |
1995 | *candidate = TREE_CHAIN (*candidate); | |
1996 | else | |
1997 | candidate = &TREE_CHAIN (*candidate); | |
1998 | } | |
1999 | ||
2000 | /* Add the new function. */ | |
2001 | ffod->candidates = tree_cons (method, path, ffod->candidates); | |
9368208b MM |
2002 | break; |
2003 | } | |
5e19c053 | 2004 | } |
dbbf88d1 | 2005 | } |
5e19c053 | 2006 | |
dbbf88d1 NS |
2007 | return NULL_TREE; |
2008 | } | |
db3d8cde | 2009 | |
dbbf88d1 NS |
2010 | static tree |
2011 | dfs_find_final_overrider_q (tree derived, int ix, void *data) | |
2012 | { | |
2013 | tree binfo = BINFO_BASETYPE (derived, ix); | |
2014 | find_final_overrider_data *ffod = (find_final_overrider_data *) data; | |
78b45a24 | 2015 | |
dbbf88d1 NS |
2016 | if (TREE_VIA_VIRTUAL (binfo)) |
2017 | ffod->vpath = tree_cons (NULL_TREE, derived, ffod->vpath); | |
2018 | ||
2019 | return binfo; | |
2020 | } | |
dd42e135 | 2021 | |
dbbf88d1 NS |
2022 | static tree |
2023 | dfs_find_final_overrider_post (tree binfo, void *data) | |
2024 | { | |
2025 | find_final_overrider_data *ffod = (find_final_overrider_data *) data; | |
2026 | ||
2027 | if (TREE_VIA_VIRTUAL (binfo) && TREE_CHAIN (ffod->vpath)) | |
2028 | ffod->vpath = TREE_CHAIN (ffod->vpath); | |
2029 | ||
dd42e135 MM |
2030 | return NULL_TREE; |
2031 | } | |
2032 | ||
5e19c053 MM |
2033 | /* Returns a TREE_LIST whose TREE_PURPOSE is the final overrider for |
2034 | FN and whose TREE_VALUE is the binfo for the base where the | |
95675950 MM |
2035 | overriding occurs. BINFO (in the hierarchy dominated by the binfo |
2036 | DERIVED) is the base object in which FN is declared. */ | |
e92cc029 | 2037 | |
a292b002 | 2038 | static tree |
94edc4ab | 2039 | find_final_overrider (tree derived, tree binfo, tree fn) |
a292b002 | 2040 | { |
5e19c053 | 2041 | find_final_overrider_data ffod; |
a292b002 | 2042 | |
0e339752 | 2043 | /* Getting this right is a little tricky. This is valid: |
a292b002 | 2044 | |
5e19c053 MM |
2045 | struct S { virtual void f (); }; |
2046 | struct T { virtual void f (); }; | |
2047 | struct U : public S, public T { }; | |
a292b002 | 2048 | |
5e19c053 | 2049 | even though calling `f' in `U' is ambiguous. But, |
a292b002 | 2050 | |
5e19c053 MM |
2051 | struct R { virtual void f(); }; |
2052 | struct S : virtual public R { virtual void f (); }; | |
2053 | struct T : virtual public R { virtual void f (); }; | |
2054 | struct U : public S, public T { }; | |
dd42e135 | 2055 | |
d0cd8b44 | 2056 | is not -- there's no way to decide whether to put `S::f' or |
5e19c053 MM |
2057 | `T::f' in the vtable for `R'. |
2058 | ||
2059 | The solution is to look at all paths to BINFO. If we find | |
2060 | different overriders along any two, then there is a problem. */ | |
07fa4878 NS |
2061 | if (DECL_THUNK_P (fn)) |
2062 | fn = THUNK_TARGET (fn); | |
2063 | ||
5e19c053 MM |
2064 | ffod.fn = fn; |
2065 | ffod.declaring_base = binfo; | |
95675950 | 2066 | ffod.most_derived_type = BINFO_TYPE (derived); |
78b45a24 | 2067 | ffod.candidates = NULL_TREE; |
dbbf88d1 | 2068 | ffod.vpath = NULL_TREE; |
78b45a24 | 2069 | |
dbbf88d1 NS |
2070 | dfs_walk_real (derived, |
2071 | dfs_find_final_overrider, | |
2072 | dfs_find_final_overrider_post, | |
2073 | dfs_find_final_overrider_q, | |
2074 | &ffod); | |
5e19c053 | 2075 | |
78b45a24 | 2076 | /* If there was no winner, issue an error message. */ |
9368208b | 2077 | if (!ffod.candidates || TREE_CHAIN (ffod.candidates)) |
d0cd8b44 | 2078 | { |
95675950 MM |
2079 | error ("no unique final overrider for `%D' in `%T'", fn, |
2080 | BINFO_TYPE (derived)); | |
d0cd8b44 JM |
2081 | return error_mark_node; |
2082 | } | |
dd42e135 | 2083 | |
9368208b | 2084 | return ffod.candidates; |
a292b002 MS |
2085 | } |
2086 | ||
548502d3 MM |
2087 | /* Return the index of the vcall offset for FN when TYPE is used as a |
2088 | virtual base. */ | |
d0cd8b44 | 2089 | |
d0cd8b44 | 2090 | static tree |
548502d3 | 2091 | get_vcall_index (tree fn, tree type) |
d0cd8b44 | 2092 | { |
548502d3 | 2093 | tree v; |
d0cd8b44 | 2094 | |
548502d3 MM |
2095 | for (v = CLASSTYPE_VCALL_INDICES (type); v; v = TREE_CHAIN (v)) |
2096 | if ((DECL_DESTRUCTOR_P (fn) && DECL_DESTRUCTOR_P (TREE_PURPOSE (v))) | |
2097 | || same_signature_p (fn, TREE_PURPOSE (v))) | |
2098 | break; | |
2099 | ||
2100 | /* There should always be an appropriate index. */ | |
2101 | my_friendly_assert (v, 20021103); | |
2102 | ||
2103 | return TREE_VALUE (v); | |
d0cd8b44 | 2104 | } |
d0cd8b44 JM |
2105 | |
2106 | /* Update an entry in the vtable for BINFO, which is in the hierarchy | |
4639c5c6 | 2107 | dominated by T. FN has been overridden in BINFO; VIRTUALS points to the |
d0cd8b44 | 2108 | corresponding position in the BINFO_VIRTUALS list. */ |
4e7512c9 MM |
2109 | |
2110 | static void | |
a2ddc397 NS |
2111 | update_vtable_entry_for_fn (tree t, tree binfo, tree fn, tree* virtuals, |
2112 | unsigned ix) | |
4e7512c9 MM |
2113 | { |
2114 | tree b; | |
2115 | tree overrider; | |
4e7512c9 | 2116 | tree delta; |
31f8e4f3 | 2117 | tree virtual_base; |
d0cd8b44 | 2118 | tree first_defn; |
3cfabe60 NS |
2119 | tree overrider_fn, overrider_target; |
2120 | tree target_fn = DECL_THUNK_P (fn) ? THUNK_TARGET (fn) : fn; | |
2121 | tree over_return, base_return; | |
f11ee281 | 2122 | bool lost = false; |
4e7512c9 | 2123 | |
d0cd8b44 JM |
2124 | /* Find the nearest primary base (possibly binfo itself) which defines |
2125 | this function; this is the class the caller will convert to when | |
2126 | calling FN through BINFO. */ | |
2127 | for (b = binfo; ; b = get_primary_binfo (b)) | |
4e7512c9 | 2128 | { |
07fa4878 | 2129 | my_friendly_assert (b, 20021227); |
3cfabe60 | 2130 | if (look_for_overrides_here (BINFO_TYPE (b), target_fn)) |
31f8e4f3 | 2131 | break; |
f11ee281 JM |
2132 | |
2133 | /* The nearest definition is from a lost primary. */ | |
2134 | if (BINFO_LOST_PRIMARY_P (b)) | |
2135 | lost = true; | |
4e7512c9 | 2136 | } |
d0cd8b44 | 2137 | first_defn = b; |
4e7512c9 | 2138 | |
31f8e4f3 | 2139 | /* Find the final overrider. */ |
3cfabe60 | 2140 | overrider = find_final_overrider (TYPE_BINFO (t), b, target_fn); |
4e7512c9 MM |
2141 | if (overrider == error_mark_node) |
2142 | return; | |
3cfabe60 NS |
2143 | overrider_target = overrider_fn = TREE_PURPOSE (overrider); |
2144 | ||
9bcb9aae | 2145 | /* Check for adjusting covariant return types. */ |
3cfabe60 NS |
2146 | over_return = TREE_TYPE (TREE_TYPE (overrider_target)); |
2147 | base_return = TREE_TYPE (TREE_TYPE (target_fn)); | |
2148 | ||
2149 | if (POINTER_TYPE_P (over_return) | |
2150 | && TREE_CODE (over_return) == TREE_CODE (base_return) | |
2151 | && CLASS_TYPE_P (TREE_TYPE (over_return)) | |
2152 | && CLASS_TYPE_P (TREE_TYPE (base_return))) | |
2153 | { | |
2154 | /* If FN is a covariant thunk, we must figure out the adjustment | |
2155 | to the final base FN was converting to. As OVERRIDER_TARGET might | |
2156 | also be converting to the return type of FN, we have to | |
2157 | combine the two conversions here. */ | |
2158 | tree fixed_offset, virtual_offset; | |
2159 | ||
2160 | if (DECL_THUNK_P (fn)) | |
2161 | { | |
2162 | fixed_offset = ssize_int (THUNK_FIXED_OFFSET (fn)); | |
2163 | virtual_offset = THUNK_VIRTUAL_OFFSET (fn); | |
3cfabe60 NS |
2164 | } |
2165 | else | |
2166 | fixed_offset = virtual_offset = NULL_TREE; | |
4977bab6 | 2167 | |
3cfabe60 NS |
2168 | if (!virtual_offset) |
2169 | { | |
2170 | /* There was no existing virtual thunk (which takes | |
9bcb9aae | 2171 | precidence). */ |
3cfabe60 NS |
2172 | tree thunk_binfo; |
2173 | base_kind kind; | |
2174 | ||
2175 | thunk_binfo = lookup_base (TREE_TYPE (over_return), | |
2176 | TREE_TYPE (base_return), | |
2177 | ba_check | ba_quiet, &kind); | |
4e7512c9 | 2178 | |
3cfabe60 NS |
2179 | if (thunk_binfo && (kind == bk_via_virtual |
2180 | || !BINFO_OFFSET_ZEROP (thunk_binfo))) | |
2181 | { | |
2182 | tree offset = BINFO_OFFSET (thunk_binfo); | |
8d1f0f67 | 2183 | |
3cfabe60 NS |
2184 | if (kind == bk_via_virtual) |
2185 | { | |
2186 | /* We convert via virtual base. Find the virtual | |
2187 | base and adjust the fixed offset to be from there. */ | |
2188 | while (!TREE_VIA_VIRTUAL (thunk_binfo)) | |
2189 | thunk_binfo = BINFO_INHERITANCE_CHAIN (thunk_binfo); | |
dbbf88d1 NS |
2190 | |
2191 | virtual_offset = thunk_binfo; | |
a2ddc397 | 2192 | offset = size_binop (MINUS_EXPR, offset, |
dbbf88d1 | 2193 | BINFO_OFFSET (virtual_offset)); |
3cfabe60 NS |
2194 | } |
2195 | if (fixed_offset) | |
2196 | /* There was an existing fixed offset, this must be | |
2197 | from the base just converted to, and the base the | |
2198 | FN was thunking to. */ | |
2199 | fixed_offset = size_binop (PLUS_EXPR, fixed_offset, offset); | |
2200 | else | |
2201 | fixed_offset = offset; | |
2202 | } | |
2203 | } | |
2204 | ||
2205 | if (fixed_offset || virtual_offset) | |
2206 | /* Replace the overriding function with a covariant thunk. We | |
2207 | will emit the overriding function in its own slot as | |
9bcb9aae | 2208 | well. */ |
3cfabe60 NS |
2209 | overrider_fn = make_thunk (overrider_target, /*this_adjusting=*/0, |
2210 | fixed_offset, virtual_offset); | |
2211 | } | |
2212 | else | |
2213 | my_friendly_assert (!DECL_THUNK_P (fn), 20021231); | |
2214 | ||
31f8e4f3 MM |
2215 | /* Assume that we will produce a thunk that convert all the way to |
2216 | the final overrider, and not to an intermediate virtual base. */ | |
9ccf6541 | 2217 | virtual_base = NULL_TREE; |
31f8e4f3 | 2218 | |
f11ee281 | 2219 | /* See if we can convert to an intermediate virtual base first, and then |
3461fba7 | 2220 | use the vcall offset located there to finish the conversion. */ |
f11ee281 | 2221 | for (; b; b = BINFO_INHERITANCE_CHAIN (b)) |
4e7512c9 | 2222 | { |
d0cd8b44 JM |
2223 | /* If we find the final overrider, then we can stop |
2224 | walking. */ | |
1f84ec23 MM |
2225 | if (same_type_p (BINFO_TYPE (b), |
2226 | BINFO_TYPE (TREE_VALUE (overrider)))) | |
2227 | break; | |
31f8e4f3 | 2228 | |
d0cd8b44 JM |
2229 | /* If we find a virtual base, and we haven't yet found the |
2230 | overrider, then there is a virtual base between the | |
2231 | declaring base (first_defn) and the final overrider. */ | |
dbbf88d1 NS |
2232 | if (TREE_VIA_VIRTUAL (b)) |
2233 | { | |
2234 | virtual_base = b; | |
2235 | break; | |
2236 | } | |
4e7512c9 | 2237 | } |
4e7512c9 | 2238 | |
a2ddc397 NS |
2239 | if (overrider_fn != overrider_target && !virtual_base) |
2240 | { | |
2241 | /* The ABI specifies that a covariant thunk includes a mangling | |
2242 | for a this pointer adjustment. This-adjusting thunks that | |
2243 | override a function from a virtual base have a vcall | |
2244 | adjustment. When the virtual base in question is a primary | |
2245 | virtual base, we know the adjustments are zero, (and in the | |
2246 | non-covariant case, we would not use the thunk). | |
2247 | Unfortunately we didn't notice this could happen, when | |
2248 | designing the ABI and so never mandated that such a covariant | |
2249 | thunk should be emitted. Because we must use the ABI mandated | |
2250 | name, we must continue searching from the binfo where we | |
2251 | found the most recent definition of the function, towards the | |
2252 | primary binfo which first introduced the function into the | |
2253 | vtable. If that enters a virtual base, we must use a vcall | |
2254 | this-adjusting thunk. Bleah! */ | |
2255 | tree probe; | |
2256 | ||
2257 | for (probe = first_defn; (probe = get_primary_binfo (probe));) | |
2258 | { | |
2259 | if (TREE_VIA_VIRTUAL (probe)) | |
2260 | virtual_base = probe; | |
2261 | if ((unsigned) list_length (BINFO_VIRTUALS (probe)) <= ix) | |
2262 | break; | |
2263 | } | |
2264 | if (virtual_base) | |
2265 | /* Even if we find a virtual base, the correct delta is | |
2266 | between the overrider and the binfo we're building a vtable | |
2267 | for. */ | |
2268 | goto virtual_covariant; | |
2269 | } | |
2270 | ||
d0cd8b44 JM |
2271 | /* Compute the constant adjustment to the `this' pointer. The |
2272 | `this' pointer, when this function is called, will point at BINFO | |
2273 | (or one of its primary bases, which are at the same offset). */ | |
31f8e4f3 | 2274 | if (virtual_base) |
20dde49d NS |
2275 | /* The `this' pointer needs to be adjusted from the declaration to |
2276 | the nearest virtual base. */ | |
d0cd8b44 | 2277 | delta = size_diffop (BINFO_OFFSET (virtual_base), |
20dde49d | 2278 | BINFO_OFFSET (first_defn)); |
f11ee281 JM |
2279 | else if (lost) |
2280 | /* If the nearest definition is in a lost primary, we don't need an | |
2281 | entry in our vtable. Except possibly in a constructor vtable, | |
2282 | if we happen to get our primary back. In that case, the offset | |
2283 | will be zero, as it will be a primary base. */ | |
2284 | delta = size_zero_node; | |
4e7512c9 | 2285 | else |
548502d3 MM |
2286 | /* The `this' pointer needs to be adjusted from pointing to |
2287 | BINFO to pointing at the base where the final overrider | |
2288 | appears. */ | |
a2ddc397 | 2289 | virtual_covariant: |
548502d3 MM |
2290 | delta = size_diffop (BINFO_OFFSET (TREE_VALUE (overrider)), |
2291 | BINFO_OFFSET (binfo)); | |
4e7512c9 | 2292 | |
3cfabe60 | 2293 | modify_vtable_entry (t, binfo, overrider_fn, delta, virtuals); |
31f8e4f3 MM |
2294 | |
2295 | if (virtual_base) | |
548502d3 | 2296 | BV_VCALL_INDEX (*virtuals) |
3cfabe60 | 2297 | = get_vcall_index (overrider_target, BINFO_TYPE (virtual_base)); |
4e7512c9 MM |
2298 | } |
2299 | ||
8026246f | 2300 | /* Called from modify_all_vtables via dfs_walk. */ |
e92cc029 | 2301 | |
8026246f | 2302 | static tree |
94edc4ab | 2303 | dfs_modify_vtables (tree binfo, void* data) |
8026246f | 2304 | { |
9965d119 | 2305 | if (/* There's no need to modify the vtable for a non-virtual |
d0cd8b44 JM |
2306 | primary base; we're not going to use that vtable anyhow. |
2307 | We do still need to do this for virtual primary bases, as they | |
2308 | could become non-primary in a construction vtable. */ | |
9965d119 | 2309 | (!BINFO_PRIMARY_P (binfo) || TREE_VIA_VIRTUAL (binfo)) |
8026246f MM |
2310 | /* Similarly, a base without a vtable needs no modification. */ |
2311 | && CLASSTYPE_VFIELDS (BINFO_TYPE (binfo))) | |
7177d104 | 2312 | { |
a2ddc397 | 2313 | tree t = (tree) data; |
5e19c053 MM |
2314 | tree virtuals; |
2315 | tree old_virtuals; | |
a2ddc397 NS |
2316 | unsigned ix; |
2317 | ||
1f84ec23 | 2318 | make_new_vtable (t, binfo); |
5e19c053 MM |
2319 | |
2320 | /* Now, go through each of the virtual functions in the virtual | |
2321 | function table for BINFO. Find the final overrider, and | |
2322 | update the BINFO_VIRTUALS list appropriately. */ | |
a2ddc397 | 2323 | for (ix = 0, virtuals = BINFO_VIRTUALS (binfo), |
da3d4dfa | 2324 | old_virtuals = BINFO_VIRTUALS (TYPE_BINFO (BINFO_TYPE (binfo))); |
5e19c053 | 2325 | virtuals; |
a2ddc397 | 2326 | ix++, virtuals = TREE_CHAIN (virtuals), |
5e19c053 | 2327 | old_virtuals = TREE_CHAIN (old_virtuals)) |
4e7512c9 MM |
2328 | update_vtable_entry_for_fn (t, |
2329 | binfo, | |
2330 | BV_FN (old_virtuals), | |
a2ddc397 | 2331 | &virtuals, ix); |
7177d104 | 2332 | } |
8026246f | 2333 | |
dbbf88d1 | 2334 | BINFO_MARKED (binfo) = 1; |
8026246f MM |
2335 | |
2336 | return NULL_TREE; | |
2337 | } | |
2338 | ||
a68ad5bd MM |
2339 | /* Update all of the primary and secondary vtables for T. Create new |
2340 | vtables as required, and initialize their RTTI information. Each | |
e6858a84 NS |
2341 | of the functions in VIRTUALS is declared in T and may override a |
2342 | virtual function from a base class; find and modify the appropriate | |
2343 | entries to point to the overriding functions. Returns a list, in | |
2344 | declaration order, of the virtual functions that are declared in T, | |
2345 | but do not appear in the primary base class vtable, and which | |
2346 | should therefore be appended to the end of the vtable for T. */ | |
a68ad5bd MM |
2347 | |
2348 | static tree | |
94edc4ab | 2349 | modify_all_vtables (tree t, tree virtuals) |
8026246f | 2350 | { |
3461fba7 NS |
2351 | tree binfo = TYPE_BINFO (t); |
2352 | tree *fnsp; | |
a68ad5bd | 2353 | |
5e19c053 | 2354 | /* Update all of the vtables. */ |
dbbf88d1 NS |
2355 | dfs_walk (binfo, dfs_modify_vtables, unmarkedp, t); |
2356 | dfs_walk (binfo, dfs_unmark, markedp, t); | |
a68ad5bd | 2357 | |
e6858a84 NS |
2358 | /* Add virtual functions not already in our primary vtable. These |
2359 | will be both those introduced by this class, and those overridden | |
2360 | from secondary bases. It does not include virtuals merely | |
2361 | inherited from secondary bases. */ | |
2362 | for (fnsp = &virtuals; *fnsp; ) | |
a68ad5bd | 2363 | { |
3461fba7 | 2364 | tree fn = TREE_VALUE (*fnsp); |
a68ad5bd | 2365 | |
e6858a84 NS |
2366 | if (!value_member (fn, BINFO_VIRTUALS (binfo)) |
2367 | || DECL_VINDEX (fn) == error_mark_node) | |
a68ad5bd | 2368 | { |
3461fba7 NS |
2369 | /* We don't need to adjust the `this' pointer when |
2370 | calling this function. */ | |
2371 | BV_DELTA (*fnsp) = integer_zero_node; | |
2372 | BV_VCALL_INDEX (*fnsp) = NULL_TREE; | |
2373 | ||
e6858a84 | 2374 | /* This is a function not already in our vtable. Keep it. */ |
3461fba7 | 2375 | fnsp = &TREE_CHAIN (*fnsp); |
a68ad5bd | 2376 | } |
3461fba7 NS |
2377 | else |
2378 | /* We've already got an entry for this function. Skip it. */ | |
2379 | *fnsp = TREE_CHAIN (*fnsp); | |
a68ad5bd | 2380 | } |
e93ee644 | 2381 | |
e6858a84 | 2382 | return virtuals; |
7177d104 MS |
2383 | } |
2384 | ||
7d5b8b11 MM |
2385 | /* Get the base virtual function declarations in T that have the |
2386 | indicated NAME. */ | |
e92cc029 | 2387 | |
5ddc28a5 | 2388 | static tree |
94edc4ab | 2389 | get_basefndecls (tree name, tree t) |
9e9ff709 | 2390 | { |
7d5b8b11 | 2391 | tree methods; |
9e9ff709 | 2392 | tree base_fndecls = NULL_TREE; |
7d5b8b11 MM |
2393 | int n_baseclasses = CLASSTYPE_N_BASECLASSES (t); |
2394 | int i; | |
9e9ff709 | 2395 | |
3d1df1fa MM |
2396 | /* Find virtual functions in T with the indicated NAME. */ |
2397 | i = lookup_fnfields_1 (t, name); | |
2398 | if (i != -1) | |
2399 | for (methods = TREE_VEC_ELT (CLASSTYPE_METHOD_VEC (t), i); | |
2400 | methods; | |
2401 | methods = OVL_NEXT (methods)) | |
2402 | { | |
2403 | tree method = OVL_CURRENT (methods); | |
2404 | ||
2405 | if (TREE_CODE (method) == FUNCTION_DECL | |
2406 | && DECL_VINDEX (method)) | |
2407 | base_fndecls = tree_cons (NULL_TREE, method, base_fndecls); | |
2408 | } | |
9e9ff709 MS |
2409 | |
2410 | if (base_fndecls) | |
2411 | return base_fndecls; | |
2412 | ||
2413 | for (i = 0; i < n_baseclasses; i++) | |
2414 | { | |
7d5b8b11 MM |
2415 | tree basetype = TYPE_BINFO_BASETYPE (t, i); |
2416 | base_fndecls = chainon (get_basefndecls (name, basetype), | |
9e9ff709 MS |
2417 | base_fndecls); |
2418 | } | |
2419 | ||
2420 | return base_fndecls; | |
2421 | } | |
2422 | ||
2ee887f2 MS |
2423 | /* If this declaration supersedes the declaration of |
2424 | a method declared virtual in the base class, then | |
2425 | mark this field as being virtual as well. */ | |
2426 | ||
bd6dd845 | 2427 | static void |
94edc4ab | 2428 | check_for_override (tree decl, tree ctype) |
2ee887f2 | 2429 | { |
cbb40945 NS |
2430 | if (TREE_CODE (decl) == TEMPLATE_DECL) |
2431 | /* In [temp.mem] we have: | |
2ee887f2 | 2432 | |
cbb40945 NS |
2433 | A specialization of a member function template does not |
2434 | override a virtual function from a base class. */ | |
2435 | return; | |
2436 | if ((DECL_DESTRUCTOR_P (decl) | |
2437 | || IDENTIFIER_VIRTUAL_P (DECL_NAME (decl))) | |
2438 | && look_for_overrides (ctype, decl) | |
2439 | && !DECL_STATIC_FUNCTION_P (decl)) | |
e6858a84 NS |
2440 | /* Set DECL_VINDEX to a value that is neither an INTEGER_CST nor |
2441 | the error_mark_node so that we know it is an overriding | |
2442 | function. */ | |
2443 | DECL_VINDEX (decl) = decl; | |
2444 | ||
cbb40945 | 2445 | if (DECL_VIRTUAL_P (decl)) |
2ee887f2 | 2446 | { |
e6858a84 | 2447 | if (!DECL_VINDEX (decl)) |
2ee887f2 MS |
2448 | DECL_VINDEX (decl) = error_mark_node; |
2449 | IDENTIFIER_VIRTUAL_P (DECL_NAME (decl)) = 1; | |
2450 | } | |
2451 | } | |
2452 | ||
fc378698 MS |
2453 | /* Warn about hidden virtual functions that are not overridden in t. |
2454 | We know that constructors and destructors don't apply. */ | |
e92cc029 | 2455 | |
9e9ff709 | 2456 | void |
94edc4ab | 2457 | warn_hidden (tree t) |
9e9ff709 MS |
2458 | { |
2459 | tree method_vec = CLASSTYPE_METHOD_VEC (t); | |
2460 | int n_methods = method_vec ? TREE_VEC_LENGTH (method_vec) : 0; | |
2461 | int i; | |
2462 | ||
2463 | /* We go through each separately named virtual function. */ | |
61a127b3 | 2464 | for (i = 2; i < n_methods && TREE_VEC_ELT (method_vec, i); ++i) |
9e9ff709 | 2465 | { |
7d5b8b11 MM |
2466 | tree fns; |
2467 | tree name; | |
2468 | tree fndecl; | |
2469 | tree base_fndecls; | |
2470 | int j; | |
2471 | ||
2472 | /* All functions in this slot in the CLASSTYPE_METHOD_VEC will | |
2473 | have the same name. Figure out what name that is. */ | |
2474 | name = DECL_NAME (OVL_CURRENT (TREE_VEC_ELT (method_vec, i))); | |
2475 | /* There are no possibly hidden functions yet. */ | |
2476 | base_fndecls = NULL_TREE; | |
2477 | /* Iterate through all of the base classes looking for possibly | |
2478 | hidden functions. */ | |
2479 | for (j = 0; j < CLASSTYPE_N_BASECLASSES (t); j++) | |
a4832853 | 2480 | { |
7d5b8b11 MM |
2481 | tree basetype = TYPE_BINFO_BASETYPE (t, j); |
2482 | base_fndecls = chainon (get_basefndecls (name, basetype), | |
2483 | base_fndecls); | |
a4832853 JM |
2484 | } |
2485 | ||
00a17e31 | 2486 | /* If there are no functions to hide, continue. */ |
7d5b8b11 | 2487 | if (!base_fndecls) |
9e9ff709 MS |
2488 | continue; |
2489 | ||
00a17e31 | 2490 | /* Remove any overridden functions. */ |
7d5b8b11 | 2491 | for (fns = TREE_VEC_ELT (method_vec, i); fns; fns = OVL_NEXT (fns)) |
9e9ff709 | 2492 | { |
7d5b8b11 MM |
2493 | fndecl = OVL_CURRENT (fns); |
2494 | if (DECL_VINDEX (fndecl)) | |
2495 | { | |
2496 | tree *prev = &base_fndecls; | |
2497 | ||
2498 | while (*prev) | |
2499 | /* If the method from the base class has the same | |
2500 | signature as the method from the derived class, it | |
2501 | has been overridden. */ | |
2502 | if (same_signature_p (fndecl, TREE_VALUE (*prev))) | |
2503 | *prev = TREE_CHAIN (*prev); | |
2504 | else | |
2505 | prev = &TREE_CHAIN (*prev); | |
2506 | } | |
9e9ff709 MS |
2507 | } |
2508 | ||
9e9ff709 MS |
2509 | /* Now give a warning for all base functions without overriders, |
2510 | as they are hidden. */ | |
7d5b8b11 MM |
2511 | while (base_fndecls) |
2512 | { | |
2513 | /* Here we know it is a hider, and no overrider exists. */ | |
2514 | cp_warning_at ("`%D' was hidden", TREE_VALUE (base_fndecls)); | |
2515 | cp_warning_at (" by `%D'", | |
2516 | OVL_CURRENT (TREE_VEC_ELT (method_vec, i))); | |
2517 | base_fndecls = TREE_CHAIN (base_fndecls); | |
2518 | } | |
9e9ff709 MS |
2519 | } |
2520 | } | |
2521 | ||
2522 | /* Check for things that are invalid. There are probably plenty of other | |
2523 | things we should check for also. */ | |
e92cc029 | 2524 | |
9e9ff709 | 2525 | static void |
94edc4ab | 2526 | finish_struct_anon (tree t) |
9e9ff709 MS |
2527 | { |
2528 | tree field; | |
f90cdf34 | 2529 | |
9e9ff709 MS |
2530 | for (field = TYPE_FIELDS (t); field; field = TREE_CHAIN (field)) |
2531 | { | |
2532 | if (TREE_STATIC (field)) | |
2533 | continue; | |
2534 | if (TREE_CODE (field) != FIELD_DECL) | |
2535 | continue; | |
2536 | ||
2537 | if (DECL_NAME (field) == NULL_TREE | |
6bdb8141 | 2538 | && ANON_AGGR_TYPE_P (TREE_TYPE (field))) |
9e9ff709 | 2539 | { |
f90cdf34 MT |
2540 | tree elt = TYPE_FIELDS (TREE_TYPE (field)); |
2541 | for (; elt; elt = TREE_CHAIN (elt)) | |
9e9ff709 | 2542 | { |
b7076960 MM |
2543 | /* We're generally only interested in entities the user |
2544 | declared, but we also find nested classes by noticing | |
2545 | the TYPE_DECL that we create implicitly. You're | |
2546 | allowed to put one anonymous union inside another, | |
6f32162a JM |
2547 | though, so we explicitly tolerate that. We use |
2548 | TYPE_ANONYMOUS_P rather than ANON_AGGR_TYPE_P so that | |
2549 | we also allow unnamed types used for defining fields. */ | |
b7076960 MM |
2550 | if (DECL_ARTIFICIAL (elt) |
2551 | && (!DECL_IMPLICIT_TYPEDEF_P (elt) | |
6f32162a | 2552 | || TYPE_ANONYMOUS_P (TREE_TYPE (elt)))) |
9e9ff709 MS |
2553 | continue; |
2554 | ||
a723baf1 | 2555 | if (constructor_name_p (DECL_NAME (elt), t)) |
cb9a3ff8 | 2556 | cp_pedwarn_at ("ISO C++ forbids member `%D' with same name as enclosing class", |
f90cdf34 | 2557 | elt); |
8ebeee52 | 2558 | |
f90cdf34 | 2559 | if (TREE_CODE (elt) != FIELD_DECL) |
8ebeee52 JM |
2560 | { |
2561 | cp_pedwarn_at ("`%#D' invalid; an anonymous union can only have non-static data members", | |
f90cdf34 | 2562 | elt); |
8ebeee52 JM |
2563 | continue; |
2564 | } | |
2565 | ||
f90cdf34 | 2566 | if (TREE_PRIVATE (elt)) |
8251199e | 2567 | cp_pedwarn_at ("private member `%#D' in anonymous union", |
f90cdf34 MT |
2568 | elt); |
2569 | else if (TREE_PROTECTED (elt)) | |
8251199e | 2570 | cp_pedwarn_at ("protected member `%#D' in anonymous union", |
f90cdf34 | 2571 | elt); |
fc378698 | 2572 | |
f90cdf34 MT |
2573 | TREE_PRIVATE (elt) = TREE_PRIVATE (field); |
2574 | TREE_PROTECTED (elt) = TREE_PROTECTED (field); | |
9e9ff709 MS |
2575 | } |
2576 | } | |
2577 | } | |
2578 | } | |
2579 | ||
7088fca9 KL |
2580 | /* Add T to CLASSTYPE_DECL_LIST of current_class_type which |
2581 | will be used later during class template instantiation. | |
2582 | When FRIEND_P is zero, T can be a static member data (VAR_DECL), | |
2583 | a non-static member data (FIELD_DECL), a member function | |
2584 | (FUNCTION_DECL), a nested type (RECORD_TYPE, ENUM_TYPE), | |
2585 | a typedef (TYPE_DECL) or a member class template (TEMPLATE_DECL) | |
2586 | When FRIEND_P is nonzero, T is either a friend class | |
2587 | (RECORD_TYPE, TEMPLATE_DECL) or a friend function | |
2588 | (FUNCTION_DECL, TEMPLATE_DECL). */ | |
2589 | ||
2590 | void | |
94edc4ab | 2591 | maybe_add_class_template_decl_list (tree type, tree t, int friend_p) |
7088fca9 KL |
2592 | { |
2593 | /* Save some memory by not creating TREE_LIST if TYPE is not template. */ | |
2594 | if (CLASSTYPE_TEMPLATE_INFO (type)) | |
2595 | CLASSTYPE_DECL_LIST (type) | |
2596 | = tree_cons (friend_p ? NULL_TREE : type, | |
2597 | t, CLASSTYPE_DECL_LIST (type)); | |
2598 | } | |
2599 | ||
61a127b3 MM |
2600 | /* Create default constructors, assignment operators, and so forth for |
2601 | the type indicated by T, if they are needed. | |
2602 | CANT_HAVE_DEFAULT_CTOR, CANT_HAVE_CONST_CTOR, and | |
9eb71d8c MM |
2603 | CANT_HAVE_CONST_ASSIGNMENT are nonzero if, for whatever reason, the |
2604 | class cannot have a default constructor, copy constructor taking a | |
2605 | const reference argument, or an assignment operator taking a const | |
2606 | reference, respectively. If a virtual destructor is created, its | |
2607 | DECL is returned; otherwise the return value is NULL_TREE. */ | |
61a127b3 | 2608 | |
f72ab53b | 2609 | static void |
94edc4ab NN |
2610 | add_implicitly_declared_members (tree t, |
2611 | int cant_have_default_ctor, | |
2612 | int cant_have_const_cctor, | |
2613 | int cant_have_const_assignment) | |
61a127b3 MM |
2614 | { |
2615 | tree default_fn; | |
2616 | tree implicit_fns = NULL_TREE; | |
61a127b3 MM |
2617 | tree virtual_dtor = NULL_TREE; |
2618 | tree *f; | |
2619 | ||
e23bd218 IR |
2620 | ++adding_implicit_members; |
2621 | ||
61a127b3 | 2622 | /* Destructor. */ |
834c6dff | 2623 | if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (t) && !TYPE_HAS_DESTRUCTOR (t)) |
61a127b3 | 2624 | { |
9eb71d8c | 2625 | default_fn = implicitly_declare_fn (sfk_destructor, t, /*const_p=*/0); |
61a127b3 MM |
2626 | check_for_override (default_fn, t); |
2627 | ||
2628 | /* If we couldn't make it work, then pretend we didn't need it. */ | |
2629 | if (default_fn == void_type_node) | |
834c6dff | 2630 | TYPE_HAS_NONTRIVIAL_DESTRUCTOR (t) = 0; |
61a127b3 MM |
2631 | else |
2632 | { | |
2633 | TREE_CHAIN (default_fn) = implicit_fns; | |
2634 | implicit_fns = default_fn; | |
2635 | ||
2636 | if (DECL_VINDEX (default_fn)) | |
2637 | virtual_dtor = default_fn; | |
2638 | } | |
2639 | } | |
834c6dff MM |
2640 | else |
2641 | /* Any non-implicit destructor is non-trivial. */ | |
2642 | TYPE_HAS_NONTRIVIAL_DESTRUCTOR (t) |= TYPE_HAS_DESTRUCTOR (t); | |
61a127b3 MM |
2643 | |
2644 | /* Default constructor. */ | |
6eabb241 | 2645 | if (! TYPE_HAS_CONSTRUCTOR (t) && ! cant_have_default_ctor) |
61a127b3 | 2646 | { |
9eb71d8c | 2647 | default_fn = implicitly_declare_fn (sfk_constructor, t, /*const_p=*/0); |
61a127b3 MM |
2648 | TREE_CHAIN (default_fn) = implicit_fns; |
2649 | implicit_fns = default_fn; | |
2650 | } | |
2651 | ||
2652 | /* Copy constructor. */ | |
6eabb241 | 2653 | if (! TYPE_HAS_INIT_REF (t) && ! TYPE_FOR_JAVA (t)) |
61a127b3 MM |
2654 | { |
2655 | /* ARM 12.18: You get either X(X&) or X(const X&), but | |
2656 | not both. --Chip */ | |
9eb71d8c MM |
2657 | default_fn |
2658 | = implicitly_declare_fn (sfk_copy_constructor, t, | |
2659 | /*const_p=*/!cant_have_const_cctor); | |
61a127b3 MM |
2660 | TREE_CHAIN (default_fn) = implicit_fns; |
2661 | implicit_fns = default_fn; | |
2662 | } | |
2663 | ||
2664 | /* Assignment operator. */ | |
6eabb241 | 2665 | if (! TYPE_HAS_ASSIGN_REF (t) && ! TYPE_FOR_JAVA (t)) |
61a127b3 | 2666 | { |
9eb71d8c MM |
2667 | default_fn |
2668 | = implicitly_declare_fn (sfk_assignment_operator, t, | |
2669 | /*const_p=*/!cant_have_const_assignment); | |
61a127b3 MM |
2670 | TREE_CHAIN (default_fn) = implicit_fns; |
2671 | implicit_fns = default_fn; | |
2672 | } | |
2673 | ||
2674 | /* Now, hook all of the new functions on to TYPE_METHODS, | |
2675 | and add them to the CLASSTYPE_METHOD_VEC. */ | |
2676 | for (f = &implicit_fns; *f; f = &TREE_CHAIN (*f)) | |
7088fca9 KL |
2677 | { |
2678 | add_method (t, *f, /*error_p=*/0); | |
2679 | maybe_add_class_template_decl_list (current_class_type, *f, /*friend_p=*/0); | |
2680 | } | |
f72ab53b MM |
2681 | if (abi_version_at_least (2)) |
2682 | /* G++ 3.2 put the implicit destructor at the *beginning* of the | |
2683 | list, which cause the destructor to be emitted in an incorrect | |
2684 | location in the vtable. */ | |
2685 | TYPE_METHODS (t) = chainon (TYPE_METHODS (t), implicit_fns); | |
2686 | else | |
2687 | { | |
2688 | if (warn_abi && virtual_dtor) | |
2689 | warning ("vtable layout for class `%T' may not be ABI-compliant " | |
2690 | "and may change in a future version of GCC due to implicit " | |
2691 | "virtual destructor", | |
2692 | t); | |
2693 | *f = TYPE_METHODS (t); | |
2694 | TYPE_METHODS (t) = implicit_fns; | |
2695 | } | |
61a127b3 | 2696 | |
e23bd218 | 2697 | --adding_implicit_members; |
61a127b3 MM |
2698 | } |
2699 | ||
f90cdf34 MT |
2700 | /* Subroutine of finish_struct_1. Recursively count the number of fields |
2701 | in TYPE, including anonymous union members. */ | |
2702 | ||
2703 | static int | |
94edc4ab | 2704 | count_fields (tree fields) |
f90cdf34 MT |
2705 | { |
2706 | tree x; | |
2707 | int n_fields = 0; | |
2708 | for (x = fields; x; x = TREE_CHAIN (x)) | |
2709 | { | |
2710 | if (TREE_CODE (x) == FIELD_DECL && ANON_AGGR_TYPE_P (TREE_TYPE (x))) | |
2711 | n_fields += count_fields (TYPE_FIELDS (TREE_TYPE (x))); | |
2712 | else | |
2713 | n_fields += 1; | |
2714 | } | |
2715 | return n_fields; | |
2716 | } | |
2717 | ||
2718 | /* Subroutine of finish_struct_1. Recursively add all the fields in the | |
d07605f5 | 2719 | TREE_LIST FIELDS to the SORTED_FIELDS_TYPE elts, starting at offset IDX. */ |
f90cdf34 MT |
2720 | |
2721 | static int | |
d07605f5 | 2722 | add_fields_to_record_type (tree fields, struct sorted_fields_type *field_vec, int idx) |
f90cdf34 MT |
2723 | { |
2724 | tree x; | |
2725 | for (x = fields; x; x = TREE_CHAIN (x)) | |
2726 | { | |
2727 | if (TREE_CODE (x) == FIELD_DECL && ANON_AGGR_TYPE_P (TREE_TYPE (x))) | |
d07605f5 | 2728 | idx = add_fields_to_record_type (TYPE_FIELDS (TREE_TYPE (x)), field_vec, idx); |
f90cdf34 | 2729 | else |
d07605f5 | 2730 | field_vec->elts[idx++] = x; |
f90cdf34 MT |
2731 | } |
2732 | return idx; | |
2733 | } | |
2734 | ||
1e30f9b4 MM |
2735 | /* FIELD is a bit-field. We are finishing the processing for its |
2736 | enclosing type. Issue any appropriate messages and set appropriate | |
2737 | flags. */ | |
2738 | ||
2739 | static void | |
94edc4ab | 2740 | check_bitfield_decl (tree field) |
1e30f9b4 MM |
2741 | { |
2742 | tree type = TREE_TYPE (field); | |
cd8ed629 | 2743 | tree w = NULL_TREE; |
1e30f9b4 | 2744 | |
cd8ed629 | 2745 | /* Detect invalid bit-field type. */ |
1e30f9b4 MM |
2746 | if (DECL_INITIAL (field) |
2747 | && ! INTEGRAL_TYPE_P (TREE_TYPE (field))) | |
2748 | { | |
2749 | cp_error_at ("bit-field `%#D' with non-integral type", field); | |
cd8ed629 | 2750 | w = error_mark_node; |
1e30f9b4 MM |
2751 | } |
2752 | ||
2753 | /* Detect and ignore out of range field width. */ | |
2754 | if (DECL_INITIAL (field)) | |
2755 | { | |
cd8ed629 | 2756 | w = DECL_INITIAL (field); |
1e30f9b4 MM |
2757 | |
2758 | /* Avoid the non_lvalue wrapper added by fold for PLUS_EXPRs. */ | |
2759 | STRIP_NOPS (w); | |
2760 | ||
2761 | /* detect invalid field size. */ | |
2762 | if (TREE_CODE (w) == CONST_DECL) | |
2763 | w = DECL_INITIAL (w); | |
fc611ce0 | 2764 | else |
1e30f9b4 MM |
2765 | w = decl_constant_value (w); |
2766 | ||
2767 | if (TREE_CODE (w) != INTEGER_CST) | |
2768 | { | |
2769 | cp_error_at ("bit-field `%D' width not an integer constant", | |
2770 | field); | |
cd8ed629 | 2771 | w = error_mark_node; |
1e30f9b4 | 2772 | } |
05bccae2 | 2773 | else if (tree_int_cst_sgn (w) < 0) |
1e30f9b4 | 2774 | { |
1e30f9b4 | 2775 | cp_error_at ("negative width in bit-field `%D'", field); |
cd8ed629 | 2776 | w = error_mark_node; |
1e30f9b4 | 2777 | } |
05bccae2 | 2778 | else if (integer_zerop (w) && DECL_NAME (field) != 0) |
1e30f9b4 | 2779 | { |
1e30f9b4 | 2780 | cp_error_at ("zero width for bit-field `%D'", field); |
cd8ed629 | 2781 | w = error_mark_node; |
1e30f9b4 | 2782 | } |
05bccae2 | 2783 | else if (compare_tree_int (w, TYPE_PRECISION (type)) > 0 |
1e30f9b4 MM |
2784 | && TREE_CODE (type) != ENUMERAL_TYPE |
2785 | && TREE_CODE (type) != BOOLEAN_TYPE) | |
2786 | cp_warning_at ("width of `%D' exceeds its type", field); | |
2787 | else if (TREE_CODE (type) == ENUMERAL_TYPE | |
05bccae2 RK |
2788 | && (0 > compare_tree_int (w, |
2789 | min_precision (TYPE_MIN_VALUE (type), | |
2790 | TREE_UNSIGNED (type))) | |
2791 | || 0 > compare_tree_int (w, | |
2792 | min_precision | |
2793 | (TYPE_MAX_VALUE (type), | |
2794 | TREE_UNSIGNED (type))))) | |
1e30f9b4 MM |
2795 | cp_warning_at ("`%D' is too small to hold all values of `%#T'", |
2796 | field, type); | |
cd8ed629 MM |
2797 | } |
2798 | ||
2799 | /* Remove the bit-field width indicator so that the rest of the | |
2800 | compiler does not treat that value as an initializer. */ | |
2801 | DECL_INITIAL (field) = NULL_TREE; | |
1e30f9b4 | 2802 | |
cd8ed629 MM |
2803 | if (w != error_mark_node) |
2804 | { | |
2805 | DECL_SIZE (field) = convert (bitsizetype, w); | |
2806 | DECL_BIT_FIELD (field) = 1; | |
1e30f9b4 MM |
2807 | } |
2808 | else | |
cd8ed629 MM |
2809 | { |
2810 | /* Non-bit-fields are aligned for their type. */ | |
2811 | DECL_BIT_FIELD (field) = 0; | |
2812 | CLEAR_DECL_C_BIT_FIELD (field); | |
cd8ed629 | 2813 | } |
1e30f9b4 MM |
2814 | } |
2815 | ||
2816 | /* FIELD is a non bit-field. We are finishing the processing for its | |
2817 | enclosing type T. Issue any appropriate messages and set appropriate | |
2818 | flags. */ | |
2819 | ||
2820 | static void | |
94edc4ab NN |
2821 | check_field_decl (tree field, |
2822 | tree t, | |
2823 | int* cant_have_const_ctor, | |
2824 | int* cant_have_default_ctor, | |
2825 | int* no_const_asn_ref, | |
2826 | int* any_default_members) | |
1e30f9b4 MM |
2827 | { |
2828 | tree type = strip_array_types (TREE_TYPE (field)); | |
2829 | ||
2830 | /* An anonymous union cannot contain any fields which would change | |
2831 | the settings of CANT_HAVE_CONST_CTOR and friends. */ | |
2832 | if (ANON_UNION_TYPE_P (type)) | |
2833 | ; | |
2834 | /* And, we don't set TYPE_HAS_CONST_INIT_REF, etc., for anonymous | |
2835 | structs. So, we recurse through their fields here. */ | |
2836 | else if (ANON_AGGR_TYPE_P (type)) | |
2837 | { | |
2838 | tree fields; | |
2839 | ||
2840 | for (fields = TYPE_FIELDS (type); fields; fields = TREE_CHAIN (fields)) | |
17aec3eb | 2841 | if (TREE_CODE (fields) == FIELD_DECL && !DECL_C_BIT_FIELD (field)) |
1e30f9b4 MM |
2842 | check_field_decl (fields, t, cant_have_const_ctor, |
2843 | cant_have_default_ctor, no_const_asn_ref, | |
2844 | any_default_members); | |
2845 | } | |
2846 | /* Check members with class type for constructors, destructors, | |
2847 | etc. */ | |
2848 | else if (CLASS_TYPE_P (type)) | |
2849 | { | |
2850 | /* Never let anything with uninheritable virtuals | |
2851 | make it through without complaint. */ | |
2852 | abstract_virtuals_error (field, type); | |
2853 | ||
2854 | if (TREE_CODE (t) == UNION_TYPE) | |
2855 | { | |
2856 | if (TYPE_NEEDS_CONSTRUCTING (type)) | |
2857 | cp_error_at ("member `%#D' with constructor not allowed in union", | |
2858 | field); | |
834c6dff | 2859 | if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type)) |
1e30f9b4 MM |
2860 | cp_error_at ("member `%#D' with destructor not allowed in union", |
2861 | field); | |
2862 | if (TYPE_HAS_COMPLEX_ASSIGN_REF (type)) | |
2863 | cp_error_at ("member `%#D' with copy assignment operator not allowed in union", | |
2864 | field); | |
2865 | } | |
2866 | else | |
2867 | { | |
2868 | TYPE_NEEDS_CONSTRUCTING (t) |= TYPE_NEEDS_CONSTRUCTING (type); | |
834c6dff MM |
2869 | TYPE_HAS_NONTRIVIAL_DESTRUCTOR (t) |
2870 | |= TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type); | |
1e30f9b4 MM |
2871 | TYPE_HAS_COMPLEX_ASSIGN_REF (t) |= TYPE_HAS_COMPLEX_ASSIGN_REF (type); |
2872 | TYPE_HAS_COMPLEX_INIT_REF (t) |= TYPE_HAS_COMPLEX_INIT_REF (type); | |
2873 | } | |
2874 | ||
2875 | if (!TYPE_HAS_CONST_INIT_REF (type)) | |
2876 | *cant_have_const_ctor = 1; | |
2877 | ||
2878 | if (!TYPE_HAS_CONST_ASSIGN_REF (type)) | |
2879 | *no_const_asn_ref = 1; | |
2880 | ||
2881 | if (TYPE_HAS_CONSTRUCTOR (type) | |
2882 | && ! TYPE_HAS_DEFAULT_CONSTRUCTOR (type)) | |
2883 | *cant_have_default_ctor = 1; | |
2884 | } | |
2885 | if (DECL_INITIAL (field) != NULL_TREE) | |
2886 | { | |
2887 | /* `build_class_init_list' does not recognize | |
2888 | non-FIELD_DECLs. */ | |
2889 | if (TREE_CODE (t) == UNION_TYPE && any_default_members != 0) | |
04d6ccbd | 2890 | error ("multiple fields in union `%T' initialized", t); |
1e30f9b4 MM |
2891 | *any_default_members = 1; |
2892 | } | |
6bb88f3b | 2893 | } |
1e30f9b4 | 2894 | |
08b962b0 MM |
2895 | /* Check the data members (both static and non-static), class-scoped |
2896 | typedefs, etc., appearing in the declaration of T. Issue | |
2897 | appropriate diagnostics. Sets ACCESS_DECLS to a list (in | |
2898 | declaration order) of access declarations; each TREE_VALUE in this | |
2899 | list is a USING_DECL. | |
8d08fdba | 2900 | |
08b962b0 | 2901 | In addition, set the following flags: |
8d08fdba | 2902 | |
08b962b0 MM |
2903 | EMPTY_P |
2904 | The class is empty, i.e., contains no non-static data members. | |
8d08fdba | 2905 | |
08b962b0 MM |
2906 | CANT_HAVE_DEFAULT_CTOR_P |
2907 | This class cannot have an implicitly generated default | |
2908 | constructor. | |
8d08fdba | 2909 | |
08b962b0 MM |
2910 | CANT_HAVE_CONST_CTOR_P |
2911 | This class cannot have an implicitly generated copy constructor | |
2912 | taking a const reference. | |
8d08fdba | 2913 | |
08b962b0 MM |
2914 | CANT_HAVE_CONST_ASN_REF |
2915 | This class cannot have an implicitly generated assignment | |
2916 | operator taking a const reference. | |
8d08fdba | 2917 | |
08b962b0 MM |
2918 | All of these flags should be initialized before calling this |
2919 | function. | |
8d08fdba | 2920 | |
08b962b0 MM |
2921 | Returns a pointer to the end of the TYPE_FIELDs chain; additional |
2922 | fields can be added by adding to this chain. */ | |
8d08fdba | 2923 | |
607cf131 | 2924 | static void |
58731fd1 MM |
2925 | check_field_decls (tree t, tree *access_decls, |
2926 | int *cant_have_default_ctor_p, | |
2927 | int *cant_have_const_ctor_p, | |
2928 | int *no_const_asn_ref_p) | |
08b962b0 MM |
2929 | { |
2930 | tree *field; | |
2931 | tree *next; | |
2932 | int has_pointers; | |
2933 | int any_default_members; | |
2934 | ||
58010b57 MM |
2935 | /* First, delete any duplicate fields. */ |
2936 | delete_duplicate_fields (TYPE_FIELDS (t)); | |
2937 | ||
08b962b0 MM |
2938 | /* Assume there are no access declarations. */ |
2939 | *access_decls = NULL_TREE; | |
2940 | /* Assume this class has no pointer members. */ | |
2941 | has_pointers = 0; | |
2942 | /* Assume none of the members of this class have default | |
2943 | initializations. */ | |
2944 | any_default_members = 0; | |
2945 | ||
2946 | for (field = &TYPE_FIELDS (t); *field; field = next) | |
8d08fdba | 2947 | { |
08b962b0 MM |
2948 | tree x = *field; |
2949 | tree type = TREE_TYPE (x); | |
8d08fdba | 2950 | |
08b962b0 | 2951 | next = &TREE_CHAIN (x); |
8d08fdba | 2952 | |
c91a56d2 | 2953 | if (TREE_CODE (x) == FIELD_DECL) |
691c003d | 2954 | { |
e0d1297c NS |
2955 | if (TYPE_PACKED (t)) |
2956 | { | |
2957 | if (!pod_type_p (TREE_TYPE (x)) && !TYPE_PACKED (TREE_TYPE (x))) | |
2958 | cp_warning_at | |
2959 | ("ignoring packed attribute on unpacked non-POD field `%#D'", | |
2960 | x); | |
2961 | else | |
2962 | DECL_PACKED (x) = 1; | |
2963 | } | |
e6267549 JM |
2964 | |
2965 | if (DECL_C_BIT_FIELD (x) && integer_zerop (DECL_INITIAL (x))) | |
08b962b0 MM |
2966 | /* We don't treat zero-width bitfields as making a class |
2967 | non-empty. */ | |
2968 | ; | |
e6267549 | 2969 | else |
f9c528ea | 2970 | { |
5ec1192e MM |
2971 | tree element_type; |
2972 | ||
f9c528ea | 2973 | /* The class is non-empty. */ |
58731fd1 | 2974 | CLASSTYPE_EMPTY_P (t) = 0; |
f9c528ea MM |
2975 | /* The class is not even nearly empty. */ |
2976 | CLASSTYPE_NEARLY_EMPTY_P (t) = 0; | |
5ec1192e MM |
2977 | /* If one of the data members contains an empty class, |
2978 | so does T. */ | |
2979 | element_type = strip_array_types (type); | |
2980 | if (CLASS_TYPE_P (element_type) | |
2981 | && CLASSTYPE_CONTAINS_EMPTY_CLASS_P (element_type)) | |
aa06d37b | 2982 | CLASSTYPE_CONTAINS_EMPTY_CLASS_P (t) = 1; |
f9c528ea | 2983 | } |
691c003d | 2984 | } |
c91a56d2 | 2985 | |
cffa8729 | 2986 | if (TREE_CODE (x) == USING_DECL) |
f30432d7 | 2987 | { |
08b962b0 MM |
2988 | /* Prune the access declaration from the list of fields. */ |
2989 | *field = TREE_CHAIN (x); | |
2990 | ||
2991 | /* Save the access declarations for our caller. */ | |
2992 | *access_decls = tree_cons (NULL_TREE, x, *access_decls); | |
2993 | ||
2994 | /* Since we've reset *FIELD there's no reason to skip to the | |
2995 | next field. */ | |
2996 | next = field; | |
f30432d7 MS |
2997 | continue; |
2998 | } | |
8d08fdba | 2999 | |
050367a3 MM |
3000 | if (TREE_CODE (x) == TYPE_DECL |
3001 | || TREE_CODE (x) == TEMPLATE_DECL) | |
f30432d7 | 3002 | continue; |
8d08fdba | 3003 | |
f30432d7 | 3004 | /* If we've gotten this far, it's a data member, possibly static, |
e92cc029 | 3005 | or an enumerator. */ |
8d08fdba | 3006 | |
17aec3eb | 3007 | DECL_CONTEXT (x) = t; |
8d08fdba | 3008 | |
f30432d7 MS |
3009 | /* ``A local class cannot have static data members.'' ARM 9.4 */ |
3010 | if (current_function_decl && TREE_STATIC (x)) | |
8251199e | 3011 | cp_error_at ("field `%D' in local class cannot be static", x); |
8d08fdba | 3012 | |
f30432d7 MS |
3013 | /* Perform error checking that did not get done in |
3014 | grokdeclarator. */ | |
52fb2769 | 3015 | if (TREE_CODE (type) == FUNCTION_TYPE) |
f30432d7 | 3016 | { |
8251199e | 3017 | cp_error_at ("field `%D' invalidly declared function type", |
f30432d7 | 3018 | x); |
52fb2769 NS |
3019 | type = build_pointer_type (type); |
3020 | TREE_TYPE (x) = type; | |
f30432d7 | 3021 | } |
52fb2769 | 3022 | else if (TREE_CODE (type) == METHOD_TYPE) |
f30432d7 | 3023 | { |
8251199e | 3024 | cp_error_at ("field `%D' invalidly declared method type", x); |
52fb2769 NS |
3025 | type = build_pointer_type (type); |
3026 | TREE_TYPE (x) = type; | |
f30432d7 | 3027 | } |
8d08fdba | 3028 | |
52fb2769 | 3029 | if (type == error_mark_node) |
f30432d7 | 3030 | continue; |
8d08fdba | 3031 | |
f30432d7 MS |
3032 | /* When this goes into scope, it will be a non-local reference. */ |
3033 | DECL_NONLOCAL (x) = 1; | |
8d08fdba | 3034 | |
f30432d7 MS |
3035 | if (TREE_CODE (x) == CONST_DECL) |
3036 | continue; | |
8d08fdba | 3037 | |
f30432d7 MS |
3038 | if (TREE_CODE (x) == VAR_DECL) |
3039 | { | |
3040 | if (TREE_CODE (t) == UNION_TYPE) | |
3041 | /* Unions cannot have static members. */ | |
8251199e | 3042 | cp_error_at ("field `%D' declared static in union", x); |
8d08fdba | 3043 | |
f30432d7 MS |
3044 | continue; |
3045 | } | |
8d08fdba | 3046 | |
f30432d7 | 3047 | /* Now it can only be a FIELD_DECL. */ |
8d08fdba | 3048 | |
f30432d7 | 3049 | if (TREE_PRIVATE (x) || TREE_PROTECTED (x)) |
08b962b0 | 3050 | CLASSTYPE_NON_AGGREGATE (t) = 1; |
8d08fdba | 3051 | |
f30432d7 MS |
3052 | /* If this is of reference type, check if it needs an init. |
3053 | Also do a little ANSI jig if necessary. */ | |
52fb2769 | 3054 | if (TREE_CODE (type) == REFERENCE_TYPE) |
f30432d7 | 3055 | { |
08b962b0 | 3056 | CLASSTYPE_NON_POD_P (t) = 1; |
f30432d7 | 3057 | if (DECL_INITIAL (x) == NULL_TREE) |
6eb35968 | 3058 | SET_CLASSTYPE_REF_FIELDS_NEED_INIT (t, 1); |
8d08fdba | 3059 | |
f30432d7 MS |
3060 | /* ARM $12.6.2: [A member initializer list] (or, for an |
3061 | aggregate, initialization by a brace-enclosed list) is the | |
3062 | only way to initialize nonstatic const and reference | |
3063 | members. */ | |
08b962b0 | 3064 | *cant_have_default_ctor_p = 1; |
e349ee73 | 3065 | TYPE_HAS_COMPLEX_ASSIGN_REF (t) = 1; |
f30432d7 | 3066 | |
b930e428 MA |
3067 | if (! TYPE_HAS_CONSTRUCTOR (t) && CLASSTYPE_NON_AGGREGATE (t) |
3068 | && extra_warnings) | |
38da6039 | 3069 | cp_warning_at ("non-static reference `%#D' in class without a constructor", x); |
f30432d7 | 3070 | } |
8d08fdba | 3071 | |
1e30f9b4 | 3072 | type = strip_array_types (type); |
52fb2769 | 3073 | |
a5ac359a | 3074 | if (TYPE_PTR_P (type)) |
824b9a4c MS |
3075 | has_pointers = 1; |
3076 | ||
52fb2769 | 3077 | if (DECL_MUTABLE_P (x) || TYPE_HAS_MUTABLE_P (type)) |
08b962b0 | 3078 | CLASSTYPE_HAS_MUTABLE (t) = 1; |
a7a7710d | 3079 | |
d282fcb2 NS |
3080 | if (! pod_type_p (type)) |
3081 | /* DR 148 now allows pointers to members (which are POD themselves), | |
3082 | to be allowed in POD structs. */ | |
08b962b0 | 3083 | CLASSTYPE_NON_POD_P (t) = 1; |
52fb2769 | 3084 | |
94e6e4c4 AO |
3085 | if (! zero_init_p (type)) |
3086 | CLASSTYPE_NON_ZERO_INIT_P (t) = 1; | |
3087 | ||
f30432d7 | 3088 | /* If any field is const, the structure type is pseudo-const. */ |
52fb2769 | 3089 | if (CP_TYPE_CONST_P (type)) |
f30432d7 MS |
3090 | { |
3091 | C_TYPE_FIELDS_READONLY (t) = 1; | |
3092 | if (DECL_INITIAL (x) == NULL_TREE) | |
6eb35968 | 3093 | SET_CLASSTYPE_READONLY_FIELDS_NEED_INIT (t, 1); |
f30432d7 MS |
3094 | |
3095 | /* ARM $12.6.2: [A member initializer list] (or, for an | |
3096 | aggregate, initialization by a brace-enclosed list) is the | |
3097 | only way to initialize nonstatic const and reference | |
3098 | members. */ | |
08b962b0 | 3099 | *cant_have_default_ctor_p = 1; |
e349ee73 | 3100 | TYPE_HAS_COMPLEX_ASSIGN_REF (t) = 1; |
f30432d7 | 3101 | |
b930e428 MA |
3102 | if (! TYPE_HAS_CONSTRUCTOR (t) && CLASSTYPE_NON_AGGREGATE (t) |
3103 | && extra_warnings) | |
38da6039 | 3104 | cp_warning_at ("non-static const member `%#D' in class without a constructor", x); |
f30432d7 | 3105 | } |
08b962b0 | 3106 | /* A field that is pseudo-const makes the structure likewise. */ |
5552b43c | 3107 | else if (CLASS_TYPE_P (type)) |
f30432d7 | 3108 | { |
08b962b0 | 3109 | C_TYPE_FIELDS_READONLY (t) |= C_TYPE_FIELDS_READONLY (type); |
6eb35968 DE |
3110 | SET_CLASSTYPE_READONLY_FIELDS_NEED_INIT (t, |
3111 | CLASSTYPE_READONLY_FIELDS_NEED_INIT (t) | |
3112 | | CLASSTYPE_READONLY_FIELDS_NEED_INIT (type)); | |
f30432d7 | 3113 | } |
8d08fdba | 3114 | |
c10bffd0 JM |
3115 | /* Core issue 80: A nonstatic data member is required to have a |
3116 | different name from the class iff the class has a | |
3117 | user-defined constructor. */ | |
633221db | 3118 | if (constructor_name_p (DECL_NAME (x), t) && TYPE_HAS_CONSTRUCTOR (t)) |
d80c3489 | 3119 | cp_pedwarn_at ("field `%#D' with same name as class", x); |
c10bffd0 | 3120 | |
162bc98d JM |
3121 | /* We set DECL_C_BIT_FIELD in grokbitfield. |
3122 | If the type and width are valid, we'll also set DECL_BIT_FIELD. */ | |
3123 | if (DECL_C_BIT_FIELD (x)) | |
1e30f9b4 | 3124 | check_bitfield_decl (x); |
f30432d7 | 3125 | else |
1e30f9b4 | 3126 | check_field_decl (x, t, |
08b962b0 MM |
3127 | cant_have_const_ctor_p, |
3128 | cant_have_default_ctor_p, | |
3129 | no_const_asn_ref_p, | |
1e30f9b4 | 3130 | &any_default_members); |
8d08fdba MS |
3131 | } |
3132 | ||
824b9a4c | 3133 | /* Effective C++ rule 11. */ |
7834ab39 | 3134 | if (has_pointers && warn_ecpp && TYPE_HAS_CONSTRUCTOR (t) |
824b9a4c MS |
3135 | && ! (TYPE_HAS_INIT_REF (t) && TYPE_HAS_ASSIGN_REF (t))) |
3136 | { | |
33bd39a2 | 3137 | warning ("`%#T' has pointer data members", t); |
824b9a4c MS |
3138 | |
3139 | if (! TYPE_HAS_INIT_REF (t)) | |
3140 | { | |
33bd39a2 | 3141 | warning (" but does not override `%T(const %T&)'", t, t); |
824b9a4c | 3142 | if (! TYPE_HAS_ASSIGN_REF (t)) |
33bd39a2 | 3143 | warning (" or `operator=(const %T&)'", t); |
824b9a4c MS |
3144 | } |
3145 | else if (! TYPE_HAS_ASSIGN_REF (t)) | |
33bd39a2 | 3146 | warning (" but does not override `operator=(const %T&)'", t); |
824b9a4c | 3147 | } |
08b962b0 | 3148 | |
607cf131 MM |
3149 | |
3150 | /* Check anonymous struct/anonymous union fields. */ | |
3151 | finish_struct_anon (t); | |
3152 | ||
08b962b0 MM |
3153 | /* We've built up the list of access declarations in reverse order. |
3154 | Fix that now. */ | |
3155 | *access_decls = nreverse (*access_decls); | |
08b962b0 MM |
3156 | } |
3157 | ||
c20118a8 MM |
3158 | /* If TYPE is an empty class type, records its OFFSET in the table of |
3159 | OFFSETS. */ | |
607cf131 | 3160 | |
c20118a8 | 3161 | static int |
94edc4ab | 3162 | record_subobject_offset (tree type, tree offset, splay_tree offsets) |
5c24fba6 | 3163 | { |
c20118a8 | 3164 | splay_tree_node n; |
5c24fba6 | 3165 | |
c20118a8 MM |
3166 | if (!is_empty_class (type)) |
3167 | return 0; | |
5c24fba6 | 3168 | |
c20118a8 MM |
3169 | /* Record the location of this empty object in OFFSETS. */ |
3170 | n = splay_tree_lookup (offsets, (splay_tree_key) offset); | |
3171 | if (!n) | |
3172 | n = splay_tree_insert (offsets, | |
3173 | (splay_tree_key) offset, | |
3174 | (splay_tree_value) NULL_TREE); | |
3175 | n->value = ((splay_tree_value) | |
3176 | tree_cons (NULL_TREE, | |
3177 | type, | |
3178 | (tree) n->value)); | |
3179 | ||
3180 | return 0; | |
607cf131 MM |
3181 | } |
3182 | ||
838dfd8a | 3183 | /* Returns nonzero if TYPE is an empty class type and there is |
c20118a8 | 3184 | already an entry in OFFSETS for the same TYPE as the same OFFSET. */ |
9785e4b1 | 3185 | |
c20118a8 | 3186 | static int |
94edc4ab | 3187 | check_subobject_offset (tree type, tree offset, splay_tree offsets) |
9785e4b1 | 3188 | { |
c20118a8 MM |
3189 | splay_tree_node n; |
3190 | tree t; | |
3191 | ||
3192 | if (!is_empty_class (type)) | |
3193 | return 0; | |
3194 | ||
3195 | /* Record the location of this empty object in OFFSETS. */ | |
3196 | n = splay_tree_lookup (offsets, (splay_tree_key) offset); | |
3197 | if (!n) | |
3198 | return 0; | |
3199 | ||
3200 | for (t = (tree) n->value; t; t = TREE_CHAIN (t)) | |
3201 | if (same_type_p (TREE_VALUE (t), type)) | |
3202 | return 1; | |
3203 | ||
3204 | return 0; | |
9785e4b1 MM |
3205 | } |
3206 | ||
c20118a8 MM |
3207 | /* Walk through all the subobjects of TYPE (located at OFFSET). Call |
3208 | F for every subobject, passing it the type, offset, and table of | |
2003cd37 MM |
3209 | OFFSETS. If VBASES_P is one, then virtual non-primary bases should |
3210 | be traversed. | |
5cdba4ff MM |
3211 | |
3212 | If MAX_OFFSET is non-NULL, then subobjects with an offset greater | |
3213 | than MAX_OFFSET will not be walked. | |
3214 | ||
838dfd8a | 3215 | If F returns a nonzero value, the traversal ceases, and that value |
5cdba4ff | 3216 | is returned. Otherwise, returns zero. */ |
d77249e7 | 3217 | |
c20118a8 | 3218 | static int |
94edc4ab NN |
3219 | walk_subobject_offsets (tree type, |
3220 | subobject_offset_fn f, | |
3221 | tree offset, | |
3222 | splay_tree offsets, | |
3223 | tree max_offset, | |
3224 | int vbases_p) | |
5c24fba6 | 3225 | { |
c20118a8 | 3226 | int r = 0; |
ff944b49 | 3227 | tree type_binfo = NULL_TREE; |
c20118a8 | 3228 | |
5cdba4ff MM |
3229 | /* If this OFFSET is bigger than the MAX_OFFSET, then we should |
3230 | stop. */ | |
3231 | if (max_offset && INT_CST_LT (max_offset, offset)) | |
3232 | return 0; | |
3233 | ||
ff944b49 MM |
3234 | if (!TYPE_P (type)) |
3235 | { | |
3236 | if (abi_version_at_least (2)) | |
3237 | type_binfo = type; | |
3238 | type = BINFO_TYPE (type); | |
3239 | } | |
3240 | ||
c20118a8 | 3241 | if (CLASS_TYPE_P (type)) |
5c24fba6 | 3242 | { |
c20118a8 | 3243 | tree field; |
17bbb839 | 3244 | tree binfo; |
c20118a8 MM |
3245 | int i; |
3246 | ||
5ec1192e MM |
3247 | /* Avoid recursing into objects that are not interesting. */ |
3248 | if (!CLASSTYPE_CONTAINS_EMPTY_CLASS_P (type)) | |
3249 | return 0; | |
3250 | ||
c20118a8 MM |
3251 | /* Record the location of TYPE. */ |
3252 | r = (*f) (type, offset, offsets); | |
3253 | if (r) | |
3254 | return r; | |
3255 | ||
3256 | /* Iterate through the direct base classes of TYPE. */ | |
ff944b49 MM |
3257 | if (!type_binfo) |
3258 | type_binfo = TYPE_BINFO (type); | |
3259 | for (i = 0; i < BINFO_N_BASETYPES (type_binfo); ++i) | |
c20118a8 | 3260 | { |
ff944b49 MM |
3261 | tree binfo_offset; |
3262 | ||
3263 | binfo = BINFO_BASETYPE (type_binfo, i); | |
17bbb839 MM |
3264 | |
3265 | if (abi_version_at_least (2) | |
3266 | && TREE_VIA_VIRTUAL (binfo)) | |
3267 | continue; | |
5c24fba6 | 3268 | |
c20118a8 MM |
3269 | if (!vbases_p |
3270 | && TREE_VIA_VIRTUAL (binfo) | |
9965d119 | 3271 | && !BINFO_PRIMARY_P (binfo)) |
c20118a8 MM |
3272 | continue; |
3273 | ||
ff944b49 MM |
3274 | if (!abi_version_at_least (2)) |
3275 | binfo_offset = size_binop (PLUS_EXPR, | |
3276 | offset, | |
3277 | BINFO_OFFSET (binfo)); | |
3278 | else | |
3279 | { | |
3280 | tree orig_binfo; | |
3281 | /* We cannot rely on BINFO_OFFSET being set for the base | |
3282 | class yet, but the offsets for direct non-virtual | |
3283 | bases can be calculated by going back to the TYPE. */ | |
3284 | orig_binfo = BINFO_BASETYPE (TYPE_BINFO (type), i); | |
3285 | binfo_offset = size_binop (PLUS_EXPR, | |
3286 | offset, | |
3287 | BINFO_OFFSET (orig_binfo)); | |
3288 | } | |
3289 | ||
3290 | r = walk_subobject_offsets (binfo, | |
c20118a8 | 3291 | f, |
ff944b49 | 3292 | binfo_offset, |
c20118a8 | 3293 | offsets, |
5cdba4ff | 3294 | max_offset, |
17bbb839 MM |
3295 | (abi_version_at_least (2) |
3296 | ? /*vbases_p=*/0 : vbases_p)); | |
c20118a8 MM |
3297 | if (r) |
3298 | return r; | |
3299 | } | |
3300 | ||
ff944b49 | 3301 | if (abi_version_at_least (2)) |
17bbb839 MM |
3302 | { |
3303 | tree vbase; | |
3304 | ||
ff944b49 MM |
3305 | /* Iterate through the virtual base classes of TYPE. In G++ |
3306 | 3.2, we included virtual bases in the direct base class | |
3307 | loop above, which results in incorrect results; the | |
3308 | correct offsets for virtual bases are only known when | |
3309 | working with the most derived type. */ | |
3310 | if (vbases_p) | |
3311 | for (vbase = CLASSTYPE_VBASECLASSES (type); | |
3312 | vbase; | |
3313 | vbase = TREE_CHAIN (vbase)) | |
3314 | { | |
3315 | binfo = TREE_VALUE (vbase); | |
3316 | r = walk_subobject_offsets (binfo, | |
3317 | f, | |
3318 | size_binop (PLUS_EXPR, | |
3319 | offset, | |
3320 | BINFO_OFFSET (binfo)), | |
3321 | offsets, | |
3322 | max_offset, | |
3323 | /*vbases_p=*/0); | |
3324 | if (r) | |
3325 | return r; | |
3326 | } | |
3327 | else | |
17bbb839 | 3328 | { |
ff944b49 MM |
3329 | /* We still have to walk the primary base, if it is |
3330 | virtual. (If it is non-virtual, then it was walked | |
3331 | above.) */ | |
3332 | vbase = get_primary_binfo (type_binfo); | |
dbbf88d1 NS |
3333 | if (vbase && TREE_VIA_VIRTUAL (vbase) |
3334 | && BINFO_PRIMARY_BASE_OF (vbase) == type_binfo) | |
ff944b49 | 3335 | { |
dbbf88d1 NS |
3336 | r = (walk_subobject_offsets |
3337 | (vbase, f, offset, | |
3338 | offsets, max_offset, /*vbases_p=*/0)); | |
3339 | if (r) | |
3340 | return r; | |
ff944b49 | 3341 | } |
17bbb839 MM |
3342 | } |
3343 | } | |
3344 | ||
c20118a8 MM |
3345 | /* Iterate through the fields of TYPE. */ |
3346 | for (field = TYPE_FIELDS (type); field; field = TREE_CHAIN (field)) | |
17bbb839 | 3347 | if (TREE_CODE (field) == FIELD_DECL && !DECL_ARTIFICIAL (field)) |
c20118a8 | 3348 | { |
956d9305 MM |
3349 | tree field_offset; |
3350 | ||
3351 | if (abi_version_at_least (2)) | |
3352 | field_offset = byte_position (field); | |
3353 | else | |
3354 | /* In G++ 3.2, DECL_FIELD_OFFSET was used. */ | |
3355 | field_offset = DECL_FIELD_OFFSET (field); | |
3356 | ||
c20118a8 MM |
3357 | r = walk_subobject_offsets (TREE_TYPE (field), |
3358 | f, | |
3359 | size_binop (PLUS_EXPR, | |
3360 | offset, | |
956d9305 | 3361 | field_offset), |
c20118a8 | 3362 | offsets, |
5cdba4ff | 3363 | max_offset, |
c20118a8 MM |
3364 | /*vbases_p=*/1); |
3365 | if (r) | |
3366 | return r; | |
3367 | } | |
5c24fba6 | 3368 | } |
c20118a8 MM |
3369 | else if (TREE_CODE (type) == ARRAY_TYPE) |
3370 | { | |
5ec1192e | 3371 | tree element_type = strip_array_types (type); |
c20118a8 MM |
3372 | tree domain = TYPE_DOMAIN (type); |
3373 | tree index; | |
5c24fba6 | 3374 | |
5ec1192e MM |
3375 | /* Avoid recursing into objects that are not interesting. */ |
3376 | if (!CLASS_TYPE_P (element_type) | |
3377 | || !CLASSTYPE_CONTAINS_EMPTY_CLASS_P (element_type)) | |
3378 | return 0; | |
3379 | ||
c20118a8 | 3380 | /* Step through each of the elements in the array. */ |
17bbb839 MM |
3381 | for (index = size_zero_node; |
3382 | /* G++ 3.2 had an off-by-one error here. */ | |
3383 | (abi_version_at_least (2) | |
3384 | ? !INT_CST_LT (TYPE_MAX_VALUE (domain), index) | |
3385 | : INT_CST_LT (index, TYPE_MAX_VALUE (domain))); | |
c20118a8 MM |
3386 | index = size_binop (PLUS_EXPR, index, size_one_node)) |
3387 | { | |
3388 | r = walk_subobject_offsets (TREE_TYPE (type), | |
3389 | f, | |
3390 | offset, | |
3391 | offsets, | |
5cdba4ff | 3392 | max_offset, |
c20118a8 MM |
3393 | /*vbases_p=*/1); |
3394 | if (r) | |
3395 | return r; | |
3396 | offset = size_binop (PLUS_EXPR, offset, | |
3397 | TYPE_SIZE_UNIT (TREE_TYPE (type))); | |
5cdba4ff MM |
3398 | /* If this new OFFSET is bigger than the MAX_OFFSET, then |
3399 | there's no point in iterating through the remaining | |
3400 | elements of the array. */ | |
3401 | if (max_offset && INT_CST_LT (max_offset, offset)) | |
3402 | break; | |
c20118a8 MM |
3403 | } |
3404 | } | |
3405 | ||
3406 | return 0; | |
3407 | } | |
3408 | ||
3409 | /* Record all of the empty subobjects of TYPE (located at OFFSET) in | |
838dfd8a | 3410 | OFFSETS. If VBASES_P is nonzero, virtual bases of TYPE are |
c20118a8 MM |
3411 | examined. */ |
3412 | ||
3413 | static void | |
94edc4ab NN |
3414 | record_subobject_offsets (tree type, |
3415 | tree offset, | |
3416 | splay_tree offsets, | |
3417 | int vbases_p) | |
c20118a8 MM |
3418 | { |
3419 | walk_subobject_offsets (type, record_subobject_offset, offset, | |
5cdba4ff | 3420 | offsets, /*max_offset=*/NULL_TREE, vbases_p); |
5c24fba6 MM |
3421 | } |
3422 | ||
838dfd8a KH |
3423 | /* Returns nonzero if any of the empty subobjects of TYPE (located at |
3424 | OFFSET) conflict with entries in OFFSETS. If VBASES_P is nonzero, | |
c20118a8 | 3425 | virtual bases of TYPE are examined. */ |
9785e4b1 MM |
3426 | |
3427 | static int | |
94edc4ab NN |
3428 | layout_conflict_p (tree type, |
3429 | tree offset, | |
3430 | splay_tree offsets, | |
3431 | int vbases_p) | |
9785e4b1 | 3432 | { |
5cdba4ff MM |
3433 | splay_tree_node max_node; |
3434 | ||
3435 | /* Get the node in OFFSETS that indicates the maximum offset where | |
3436 | an empty subobject is located. */ | |
3437 | max_node = splay_tree_max (offsets); | |
3438 | /* If there aren't any empty subobjects, then there's no point in | |
3439 | performing this check. */ | |
3440 | if (!max_node) | |
3441 | return 0; | |
3442 | ||
c20118a8 | 3443 | return walk_subobject_offsets (type, check_subobject_offset, offset, |
5cdba4ff MM |
3444 | offsets, (tree) (max_node->key), |
3445 | vbases_p); | |
9785e4b1 MM |
3446 | } |
3447 | ||
5c24fba6 MM |
3448 | /* DECL is a FIELD_DECL corresponding either to a base subobject of a |
3449 | non-static data member of the type indicated by RLI. BINFO is the | |
c20118a8 | 3450 | binfo corresponding to the base subobject, OFFSETS maps offsets to |
17bbb839 MM |
3451 | types already located at those offsets. This function determines |
3452 | the position of the DECL. */ | |
5c24fba6 MM |
3453 | |
3454 | static void | |
17bbb839 MM |
3455 | layout_nonempty_base_or_field (record_layout_info rli, |
3456 | tree decl, | |
3457 | tree binfo, | |
3458 | splay_tree offsets) | |
5c24fba6 | 3459 | { |
c20118a8 | 3460 | tree offset = NULL_TREE; |
17bbb839 MM |
3461 | bool field_p; |
3462 | tree type; | |
3463 | ||
3464 | if (binfo) | |
3465 | { | |
3466 | /* For the purposes of determining layout conflicts, we want to | |
3467 | use the class type of BINFO; TREE_TYPE (DECL) will be the | |
3468 | CLASSTYPE_AS_BASE version, which does not contain entries for | |
3469 | zero-sized bases. */ | |
3470 | type = TREE_TYPE (binfo); | |
3471 | field_p = false; | |
3472 | } | |
3473 | else | |
3474 | { | |
3475 | type = TREE_TYPE (decl); | |
3476 | field_p = true; | |
3477 | } | |
c20118a8 | 3478 | |
5c24fba6 MM |
3479 | /* Try to place the field. It may take more than one try if we have |
3480 | a hard time placing the field without putting two objects of the | |
3481 | same type at the same address. */ | |
3482 | while (1) | |
3483 | { | |
defd0dea | 3484 | struct record_layout_info_s old_rli = *rli; |
5c24fba6 | 3485 | |
770ae6cc RK |
3486 | /* Place this field. */ |
3487 | place_field (rli, decl); | |
da3d4dfa | 3488 | offset = byte_position (decl); |
5c24fba6 MM |
3489 | |
3490 | /* We have to check to see whether or not there is already | |
3491 | something of the same type at the offset we're about to use. | |
3492 | For example: | |
3493 | ||
3494 | struct S {}; | |
3495 | struct T : public S { int i; }; | |
3496 | struct U : public S, public T {}; | |
3497 | ||
3498 | Here, we put S at offset zero in U. Then, we can't put T at | |
3499 | offset zero -- its S component would be at the same address | |
3500 | as the S we already allocated. So, we have to skip ahead. | |
3501 | Since all data members, including those whose type is an | |
838dfd8a | 3502 | empty class, have nonzero size, any overlap can happen only |
5c24fba6 MM |
3503 | with a direct or indirect base-class -- it can't happen with |
3504 | a data member. */ | |
7ba539c6 MM |
3505 | /* G++ 3.2 did not check for overlaps when placing a non-empty |
3506 | virtual base. */ | |
3507 | if (!abi_version_at_least (2) && binfo && TREE_VIA_VIRTUAL (binfo)) | |
3508 | break; | |
ff944b49 MM |
3509 | if (layout_conflict_p (field_p ? type : binfo, offset, |
3510 | offsets, field_p)) | |
5c24fba6 | 3511 | { |
5c24fba6 MM |
3512 | /* Strip off the size allocated to this field. That puts us |
3513 | at the first place we could have put the field with | |
3514 | proper alignment. */ | |
770ae6cc RK |
3515 | *rli = old_rli; |
3516 | ||
c20118a8 | 3517 | /* Bump up by the alignment required for the type. */ |
770ae6cc | 3518 | rli->bitpos |
c20118a8 MM |
3519 | = size_binop (PLUS_EXPR, rli->bitpos, |
3520 | bitsize_int (binfo | |
3521 | ? CLASSTYPE_ALIGN (type) | |
3522 | : TYPE_ALIGN (type))); | |
770ae6cc | 3523 | normalize_rli (rli); |
5c24fba6 MM |
3524 | } |
3525 | else | |
3526 | /* There was no conflict. We're done laying out this field. */ | |
3527 | break; | |
3528 | } | |
c20118a8 | 3529 | |
623fe76a | 3530 | /* Now that we know where it will be placed, update its |
c20118a8 MM |
3531 | BINFO_OFFSET. */ |
3532 | if (binfo && CLASS_TYPE_P (BINFO_TYPE (binfo))) | |
90024bdc | 3533 | /* Indirect virtual bases may have a nonzero BINFO_OFFSET at |
17bbb839 MM |
3534 | this point because their BINFO_OFFSET is copied from another |
3535 | hierarchy. Therefore, we may not need to add the entire | |
3536 | OFFSET. */ | |
c20118a8 | 3537 | propagate_binfo_offsets (binfo, |
17bbb839 MM |
3538 | size_diffop (convert (ssizetype, offset), |
3539 | convert (ssizetype, | |
dbbf88d1 | 3540 | BINFO_OFFSET (binfo)))); |
5c24fba6 MM |
3541 | } |
3542 | ||
90024bdc | 3543 | /* Returns true if TYPE is empty and OFFSET is nonzero. */ |
7ba539c6 MM |
3544 | |
3545 | static int | |
3546 | empty_base_at_nonzero_offset_p (tree type, | |
3547 | tree offset, | |
3548 | splay_tree offsets ATTRIBUTE_UNUSED) | |
3549 | { | |
3550 | return is_empty_class (type) && !integer_zerop (offset); | |
3551 | } | |
3552 | ||
9785e4b1 | 3553 | /* Layout the empty base BINFO. EOC indicates the byte currently just |
ec386958 | 3554 | past the end of the class, and should be correctly aligned for a |
c20118a8 | 3555 | class of the type indicated by BINFO; OFFSETS gives the offsets of |
623fe76a | 3556 | the empty bases allocated so far. T is the most derived |
838dfd8a | 3557 | type. Return nonzero iff we added it at the end. */ |
9785e4b1 | 3558 | |
06d9f09f | 3559 | static bool |
dbbf88d1 | 3560 | layout_empty_base (tree binfo, tree eoc, splay_tree offsets) |
9785e4b1 | 3561 | { |
ec386958 | 3562 | tree alignment; |
9785e4b1 | 3563 | tree basetype = BINFO_TYPE (binfo); |
06d9f09f | 3564 | bool atend = false; |
956d9305 | 3565 | |
9785e4b1 MM |
3566 | /* This routine should only be used for empty classes. */ |
3567 | my_friendly_assert (is_empty_class (basetype), 20000321); | |
1b50716d | 3568 | alignment = ssize_int (CLASSTYPE_ALIGN_UNIT (basetype)); |
956d9305 MM |
3569 | |
3570 | if (abi_version_at_least (2)) | |
3571 | BINFO_OFFSET (binfo) = size_zero_node; | |
3572 | if (warn_abi && !integer_zerop (BINFO_OFFSET (binfo))) | |
3573 | warning ("offset of empty base `%T' may not be ABI-compliant and may" | |
3574 | "change in a future version of GCC", | |
3575 | BINFO_TYPE (binfo)); | |
9785e4b1 MM |
3576 | |
3577 | /* This is an empty base class. We first try to put it at offset | |
3578 | zero. */ | |
ff944b49 | 3579 | if (layout_conflict_p (binfo, |
c20118a8 MM |
3580 | BINFO_OFFSET (binfo), |
3581 | offsets, | |
3582 | /*vbases_p=*/0)) | |
9785e4b1 MM |
3583 | { |
3584 | /* That didn't work. Now, we move forward from the next | |
3585 | available spot in the class. */ | |
06d9f09f | 3586 | atend = true; |
dbbf88d1 | 3587 | propagate_binfo_offsets (binfo, convert (ssizetype, eoc)); |
9785e4b1 MM |
3588 | while (1) |
3589 | { | |
ff944b49 | 3590 | if (!layout_conflict_p (binfo, |
c20118a8 MM |
3591 | BINFO_OFFSET (binfo), |
3592 | offsets, | |
3593 | /*vbases_p=*/0)) | |
9785e4b1 MM |
3594 | /* We finally found a spot where there's no overlap. */ |
3595 | break; | |
3596 | ||
3597 | /* There's overlap here, too. Bump along to the next spot. */ | |
dbbf88d1 | 3598 | propagate_binfo_offsets (binfo, alignment); |
9785e4b1 MM |
3599 | } |
3600 | } | |
06d9f09f | 3601 | return atend; |
9785e4b1 MM |
3602 | } |
3603 | ||
17bbb839 | 3604 | /* Layout the the base given by BINFO in the class indicated by RLI. |
58731fd1 | 3605 | *BASE_ALIGN is a running maximum of the alignments of |
17bbb839 MM |
3606 | any base class. OFFSETS gives the location of empty base |
3607 | subobjects. T is the most derived type. Return nonzero if the new | |
3608 | object cannot be nearly-empty. A new FIELD_DECL is inserted at | |
3609 | *NEXT_FIELD, unless BINFO is for an empty base class. | |
5c24fba6 | 3610 | |
17bbb839 MM |
3611 | Returns the location at which the next field should be inserted. */ |
3612 | ||
3613 | static tree * | |
58731fd1 | 3614 | build_base_field (record_layout_info rli, tree binfo, |
17bbb839 | 3615 | splay_tree offsets, tree *next_field) |
d77249e7 | 3616 | { |
17bbb839 | 3617 | tree t = rli->t; |
d77249e7 | 3618 | tree basetype = BINFO_TYPE (binfo); |
d77249e7 | 3619 | |
d0f062fb | 3620 | if (!COMPLETE_TYPE_P (basetype)) |
d77249e7 MM |
3621 | /* This error is now reported in xref_tag, thus giving better |
3622 | location information. */ | |
17bbb839 | 3623 | return next_field; |
d77249e7 | 3624 | |
17bbb839 MM |
3625 | /* Place the base class. */ |
3626 | if (!is_empty_class (basetype)) | |
5c24fba6 | 3627 | { |
17bbb839 MM |
3628 | tree decl; |
3629 | ||
5c24fba6 MM |
3630 | /* The containing class is non-empty because it has a non-empty |
3631 | base class. */ | |
58731fd1 | 3632 | CLASSTYPE_EMPTY_P (t) = 0; |
17bbb839 MM |
3633 | |
3634 | /* Create the FIELD_DECL. */ | |
3635 | decl = build_decl (FIELD_DECL, NULL_TREE, CLASSTYPE_AS_BASE (basetype)); | |
3636 | DECL_ARTIFICIAL (decl) = 1; | |
3637 | DECL_FIELD_CONTEXT (decl) = t; | |
3638 | DECL_SIZE (decl) = CLASSTYPE_SIZE (basetype); | |
3639 | DECL_SIZE_UNIT (decl) = CLASSTYPE_SIZE_UNIT (basetype); | |
3640 | DECL_ALIGN (decl) = CLASSTYPE_ALIGN (basetype); | |
3641 | DECL_USER_ALIGN (decl) = CLASSTYPE_USER_ALIGN (basetype); | |
0f3a8219 MEC |
3642 | DECL_IGNORED_P (decl) = 1; |
3643 | ||
5c24fba6 MM |
3644 | /* Try to place the field. It may take more than one try if we |
3645 | have a hard time placing the field without putting two | |
3646 | objects of the same type at the same address. */ | |
17bbb839 MM |
3647 | layout_nonempty_base_or_field (rli, decl, binfo, offsets); |
3648 | /* Add the new FIELD_DECL to the list of fields for T. */ | |
3649 | TREE_CHAIN (decl) = *next_field; | |
3650 | *next_field = decl; | |
3651 | next_field = &TREE_CHAIN (decl); | |
5c24fba6 MM |
3652 | } |
3653 | else | |
ec386958 | 3654 | { |
17bbb839 | 3655 | tree eoc; |
7ba539c6 | 3656 | bool atend; |
ec386958 MM |
3657 | |
3658 | /* On some platforms (ARM), even empty classes will not be | |
3659 | byte-aligned. */ | |
17bbb839 MM |
3660 | eoc = round_up (rli_size_unit_so_far (rli), |
3661 | CLASSTYPE_ALIGN_UNIT (basetype)); | |
dbbf88d1 | 3662 | atend = layout_empty_base (binfo, eoc, offsets); |
7ba539c6 MM |
3663 | /* A nearly-empty class "has no proper base class that is empty, |
3664 | not morally virtual, and at an offset other than zero." */ | |
3665 | if (!TREE_VIA_VIRTUAL (binfo) && CLASSTYPE_NEARLY_EMPTY_P (t)) | |
3666 | { | |
3667 | if (atend) | |
3668 | CLASSTYPE_NEARLY_EMPTY_P (t) = 0; | |
3669 | /* The check above (used in G++ 3.2) is insufficient because | |
3670 | an empty class placed at offset zero might itself have an | |
90024bdc | 3671 | empty base at a nonzero offset. */ |
7ba539c6 MM |
3672 | else if (walk_subobject_offsets (basetype, |
3673 | empty_base_at_nonzero_offset_p, | |
3674 | size_zero_node, | |
3675 | /*offsets=*/NULL, | |
3676 | /*max_offset=*/NULL_TREE, | |
3677 | /*vbases_p=*/true)) | |
3678 | { | |
3679 | if (abi_version_at_least (2)) | |
3680 | CLASSTYPE_NEARLY_EMPTY_P (t) = 0; | |
3681 | else if (warn_abi) | |
3682 | warning ("class `%T' will be considered nearly empty in a " | |
3683 | "future version of GCC", t); | |
3684 | } | |
3685 | } | |
3686 | ||
17bbb839 MM |
3687 | /* We do not create a FIELD_DECL for empty base classes because |
3688 | it might overlap some other field. We want to be able to | |
3689 | create CONSTRUCTORs for the class by iterating over the | |
3690 | FIELD_DECLs, and the back end does not handle overlapping | |
3691 | FIELD_DECLs. */ | |
58731fd1 MM |
3692 | |
3693 | /* An empty virtual base causes a class to be non-empty | |
3694 | -- but in that case we do not need to clear CLASSTYPE_EMPTY_P | |
3695 | here because that was already done when the virtual table | |
3696 | pointer was created. */ | |
ec386958 | 3697 | } |
5c24fba6 | 3698 | |
5c24fba6 | 3699 | /* Record the offsets of BINFO and its base subobjects. */ |
ff944b49 | 3700 | record_subobject_offsets (binfo, |
c20118a8 MM |
3701 | BINFO_OFFSET (binfo), |
3702 | offsets, | |
3703 | /*vbases_p=*/0); | |
17bbb839 MM |
3704 | |
3705 | return next_field; | |
d77249e7 MM |
3706 | } |
3707 | ||
c20118a8 | 3708 | /* Layout all of the non-virtual base classes. Record empty |
17bbb839 MM |
3709 | subobjects in OFFSETS. T is the most derived type. Return nonzero |
3710 | if the type cannot be nearly empty. The fields created | |
3711 | corresponding to the base classes will be inserted at | |
3712 | *NEXT_FIELD. */ | |
607cf131 | 3713 | |
17bbb839 | 3714 | static void |
58731fd1 | 3715 | build_base_fields (record_layout_info rli, |
17bbb839 | 3716 | splay_tree offsets, tree *next_field) |
607cf131 MM |
3717 | { |
3718 | /* Chain to hold all the new FIELD_DECLs which stand in for base class | |
3719 | subobjects. */ | |
17bbb839 MM |
3720 | tree t = rli->t; |
3721 | int n_baseclasses = CLASSTYPE_N_BASECLASSES (t); | |
5c24fba6 | 3722 | int i; |
607cf131 | 3723 | |
3461fba7 | 3724 | /* The primary base class is always allocated first. */ |
17bbb839 MM |
3725 | if (CLASSTYPE_HAS_PRIMARY_BASE_P (t)) |
3726 | next_field = build_base_field (rli, CLASSTYPE_PRIMARY_BINFO (t), | |
58731fd1 | 3727 | offsets, next_field); |
d77249e7 MM |
3728 | |
3729 | /* Now allocate the rest of the bases. */ | |
607cf131 MM |
3730 | for (i = 0; i < n_baseclasses; ++i) |
3731 | { | |
d77249e7 | 3732 | tree base_binfo; |
607cf131 | 3733 | |
17bbb839 | 3734 | base_binfo = BINFO_BASETYPE (TYPE_BINFO (t), i); |
911a71a7 | 3735 | |
3461fba7 NS |
3736 | /* The primary base was already allocated above, so we don't |
3737 | need to allocate it again here. */ | |
17bbb839 | 3738 | if (base_binfo == CLASSTYPE_PRIMARY_BINFO (t)) |
607cf131 MM |
3739 | continue; |
3740 | ||
dbbf88d1 NS |
3741 | /* Virtual bases are added at the end (a primary virtual base |
3742 | will have already been added). */ | |
3743 | if (TREE_VIA_VIRTUAL (base_binfo)) | |
607cf131 MM |
3744 | continue; |
3745 | ||
58731fd1 | 3746 | next_field = build_base_field (rli, base_binfo, |
17bbb839 | 3747 | offsets, next_field); |
607cf131 | 3748 | } |
607cf131 MM |
3749 | } |
3750 | ||
58010b57 MM |
3751 | /* Go through the TYPE_METHODS of T issuing any appropriate |
3752 | diagnostics, figuring out which methods override which other | |
3ef397c1 | 3753 | methods, and so forth. */ |
58010b57 MM |
3754 | |
3755 | static void | |
94edc4ab | 3756 | check_methods (tree t) |
58010b57 MM |
3757 | { |
3758 | tree x; | |
58010b57 MM |
3759 | |
3760 | for (x = TYPE_METHODS (t); x; x = TREE_CHAIN (x)) | |
3761 | { | |
58010b57 | 3762 | /* If this was an evil function, don't keep it in class. */ |
92643fea MM |
3763 | if (DECL_ASSEMBLER_NAME_SET_P (x) |
3764 | && IDENTIFIER_ERROR_LOCUS (DECL_ASSEMBLER_NAME (x))) | |
58010b57 MM |
3765 | continue; |
3766 | ||
58010b57 | 3767 | check_for_override (x, t); |
fee7654e | 3768 | if (DECL_PURE_VIRTUAL_P (x) && ! DECL_VINDEX (x)) |
58010b57 MM |
3769 | cp_error_at ("initializer specified for non-virtual method `%D'", x); |
3770 | ||
3771 | /* The name of the field is the original field name | |
3772 | Save this in auxiliary field for later overloading. */ | |
3773 | if (DECL_VINDEX (x)) | |
3774 | { | |
3ef397c1 | 3775 | TYPE_POLYMORPHIC_P (t) = 1; |
fee7654e MM |
3776 | if (DECL_PURE_VIRTUAL_P (x)) |
3777 | CLASSTYPE_PURE_VIRTUALS (t) | |
3778 | = tree_cons (NULL_TREE, x, CLASSTYPE_PURE_VIRTUALS (t)); | |
58010b57 MM |
3779 | } |
3780 | } | |
58010b57 MM |
3781 | } |
3782 | ||
db9b2174 MM |
3783 | /* FN is a constructor or destructor. Clone the declaration to create |
3784 | a specialized in-charge or not-in-charge version, as indicated by | |
3785 | NAME. */ | |
3786 | ||
3787 | static tree | |
94edc4ab | 3788 | build_clone (tree fn, tree name) |
db9b2174 MM |
3789 | { |
3790 | tree parms; | |
3791 | tree clone; | |
3792 | ||
3793 | /* Copy the function. */ | |
3794 | clone = copy_decl (fn); | |
3795 | /* Remember where this function came from. */ | |
3796 | DECL_CLONED_FUNCTION (clone) = fn; | |
5daf7c0a | 3797 | DECL_ABSTRACT_ORIGIN (clone) = fn; |
db9b2174 MM |
3798 | /* Reset the function name. */ |
3799 | DECL_NAME (clone) = name; | |
71cb9286 | 3800 | SET_DECL_ASSEMBLER_NAME (clone, NULL_TREE); |
db9b2174 MM |
3801 | /* There's no pending inline data for this function. */ |
3802 | DECL_PENDING_INLINE_INFO (clone) = NULL; | |
3803 | DECL_PENDING_INLINE_P (clone) = 0; | |
3804 | /* And it hasn't yet been deferred. */ | |
3805 | DECL_DEFERRED_FN (clone) = 0; | |
3806 | ||
298d6f60 MM |
3807 | /* The base-class destructor is not virtual. */ |
3808 | if (name == base_dtor_identifier) | |
3809 | { | |
3810 | DECL_VIRTUAL_P (clone) = 0; | |
3811 | if (TREE_CODE (clone) != TEMPLATE_DECL) | |
3812 | DECL_VINDEX (clone) = NULL_TREE; | |
3813 | } | |
3814 | ||
4e7512c9 | 3815 | /* If there was an in-charge parameter, drop it from the function |
db9b2174 MM |
3816 | type. */ |
3817 | if (DECL_HAS_IN_CHARGE_PARM_P (clone)) | |
3818 | { | |
3819 | tree basetype; | |
3820 | tree parmtypes; | |
3821 | tree exceptions; | |
3822 | ||
3823 | exceptions = TYPE_RAISES_EXCEPTIONS (TREE_TYPE (clone)); | |
3824 | basetype = TYPE_METHOD_BASETYPE (TREE_TYPE (clone)); | |
3825 | parmtypes = TYPE_ARG_TYPES (TREE_TYPE (clone)); | |
3826 | /* Skip the `this' parameter. */ | |
3827 | parmtypes = TREE_CHAIN (parmtypes); | |
3828 | /* Skip the in-charge parameter. */ | |
3829 | parmtypes = TREE_CHAIN (parmtypes); | |
e0fff4b3 JM |
3830 | /* And the VTT parm, in a complete [cd]tor. */ |
3831 | if (DECL_HAS_VTT_PARM_P (fn) | |
3832 | && ! DECL_NEEDS_VTT_PARM_P (clone)) | |
3833 | parmtypes = TREE_CHAIN (parmtypes); | |
3ec6bad3 MM |
3834 | /* If this is subobject constructor or destructor, add the vtt |
3835 | parameter. */ | |
db9b2174 MM |
3836 | TREE_TYPE (clone) |
3837 | = build_cplus_method_type (basetype, | |
3838 | TREE_TYPE (TREE_TYPE (clone)), | |
3839 | parmtypes); | |
3840 | if (exceptions) | |
3841 | TREE_TYPE (clone) = build_exception_variant (TREE_TYPE (clone), | |
3842 | exceptions); | |
3843 | } | |
3844 | ||
e0fff4b3 JM |
3845 | /* Copy the function parameters. But, DECL_ARGUMENTS on a TEMPLATE_DECL |
3846 | aren't function parameters; those are the template parameters. */ | |
db9b2174 MM |
3847 | if (TREE_CODE (clone) != TEMPLATE_DECL) |
3848 | { | |
3849 | DECL_ARGUMENTS (clone) = copy_list (DECL_ARGUMENTS (clone)); | |
3850 | /* Remove the in-charge parameter. */ | |
3851 | if (DECL_HAS_IN_CHARGE_PARM_P (clone)) | |
3852 | { | |
3853 | TREE_CHAIN (DECL_ARGUMENTS (clone)) | |
3854 | = TREE_CHAIN (TREE_CHAIN (DECL_ARGUMENTS (clone))); | |
3855 | DECL_HAS_IN_CHARGE_PARM_P (clone) = 0; | |
3856 | } | |
e0fff4b3 JM |
3857 | /* And the VTT parm, in a complete [cd]tor. */ |
3858 | if (DECL_HAS_VTT_PARM_P (fn)) | |
3ec6bad3 | 3859 | { |
e0fff4b3 JM |
3860 | if (DECL_NEEDS_VTT_PARM_P (clone)) |
3861 | DECL_HAS_VTT_PARM_P (clone) = 1; | |
3862 | else | |
3863 | { | |
3864 | TREE_CHAIN (DECL_ARGUMENTS (clone)) | |
3865 | = TREE_CHAIN (TREE_CHAIN (DECL_ARGUMENTS (clone))); | |
3866 | DECL_HAS_VTT_PARM_P (clone) = 0; | |
3867 | } | |
3ec6bad3 MM |
3868 | } |
3869 | ||
db9b2174 MM |
3870 | for (parms = DECL_ARGUMENTS (clone); parms; parms = TREE_CHAIN (parms)) |
3871 | { | |
3872 | DECL_CONTEXT (parms) = clone; | |
63e1b1c4 | 3873 | cxx_dup_lang_specific_decl (parms); |
db9b2174 MM |
3874 | } |
3875 | } | |
3876 | ||
db9b2174 | 3877 | /* Create the RTL for this function. */ |
19e7881c | 3878 | SET_DECL_RTL (clone, NULL_RTX); |
db9b2174 MM |
3879 | rest_of_decl_compilation (clone, NULL, /*top_level=*/1, at_eof); |
3880 | ||
3881 | /* Make it easy to find the CLONE given the FN. */ | |
3882 | TREE_CHAIN (clone) = TREE_CHAIN (fn); | |
3883 | TREE_CHAIN (fn) = clone; | |
3884 | ||
3885 | /* If this is a template, handle the DECL_TEMPLATE_RESULT as well. */ | |
3886 | if (TREE_CODE (clone) == TEMPLATE_DECL) | |
3887 | { | |
3888 | tree result; | |
3889 | ||
3890 | DECL_TEMPLATE_RESULT (clone) | |
3891 | = build_clone (DECL_TEMPLATE_RESULT (clone), name); | |
3892 | result = DECL_TEMPLATE_RESULT (clone); | |
3893 | DECL_TEMPLATE_INFO (result) = copy_node (DECL_TEMPLATE_INFO (result)); | |
3894 | DECL_TI_TEMPLATE (result) = clone; | |
3895 | } | |
298d6f60 MM |
3896 | else if (DECL_DEFERRED_FN (fn)) |
3897 | defer_fn (clone); | |
db9b2174 MM |
3898 | |
3899 | return clone; | |
3900 | } | |
3901 | ||
3902 | /* Produce declarations for all appropriate clones of FN. If | |
838dfd8a | 3903 | UPDATE_METHOD_VEC_P is nonzero, the clones are added to the |
db9b2174 MM |
3904 | CLASTYPE_METHOD_VEC as well. */ |
3905 | ||
3906 | void | |
94edc4ab | 3907 | clone_function_decl (tree fn, int update_method_vec_p) |
db9b2174 MM |
3908 | { |
3909 | tree clone; | |
3910 | ||
c00996a3 | 3911 | /* Avoid inappropriate cloning. */ |
1f84ec23 MM |
3912 | if (TREE_CHAIN (fn) |
3913 | && DECL_CLONED_FUNCTION (TREE_CHAIN (fn))) | |
c00996a3 JM |
3914 | return; |
3915 | ||
298d6f60 | 3916 | if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (fn)) |
db9b2174 | 3917 | { |
298d6f60 MM |
3918 | /* For each constructor, we need two variants: an in-charge version |
3919 | and a not-in-charge version. */ | |
db9b2174 MM |
3920 | clone = build_clone (fn, complete_ctor_identifier); |
3921 | if (update_method_vec_p) | |
452a394b | 3922 | add_method (DECL_CONTEXT (clone), clone, /*error_p=*/0); |
db9b2174 MM |
3923 | clone = build_clone (fn, base_ctor_identifier); |
3924 | if (update_method_vec_p) | |
452a394b | 3925 | add_method (DECL_CONTEXT (clone), clone, /*error_p=*/0); |
db9b2174 MM |
3926 | } |
3927 | else | |
298d6f60 MM |
3928 | { |
3929 | my_friendly_assert (DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P (fn), 20000411); | |
3930 | ||
3ec6bad3 | 3931 | /* For each destructor, we need three variants: an in-charge |
298d6f60 | 3932 | version, a not-in-charge version, and an in-charge deleting |
4e7512c9 MM |
3933 | version. We clone the deleting version first because that |
3934 | means it will go second on the TYPE_METHODS list -- and that | |
3935 | corresponds to the correct layout order in the virtual | |
52682a1b MM |
3936 | function table. |
3937 | ||
3938 | For a non-virtual destructor, we do not build a deleting | |
3939 | destructor. */ | |
3940 | if (DECL_VIRTUAL_P (fn)) | |
3941 | { | |
3942 | clone = build_clone (fn, deleting_dtor_identifier); | |
3943 | if (update_method_vec_p) | |
3944 | add_method (DECL_CONTEXT (clone), clone, /*error_p=*/0); | |
3945 | } | |
4e7512c9 | 3946 | clone = build_clone (fn, complete_dtor_identifier); |
298d6f60 | 3947 | if (update_method_vec_p) |
452a394b | 3948 | add_method (DECL_CONTEXT (clone), clone, /*error_p=*/0); |
298d6f60 MM |
3949 | clone = build_clone (fn, base_dtor_identifier); |
3950 | if (update_method_vec_p) | |
452a394b | 3951 | add_method (DECL_CONTEXT (clone), clone, /*error_p=*/0); |
298d6f60 | 3952 | } |
5daf7c0a JM |
3953 | |
3954 | /* Note that this is an abstract function that is never emitted. */ | |
3955 | DECL_ABSTRACT (fn) = 1; | |
db9b2174 MM |
3956 | } |
3957 | ||
5f6eeeb3 NS |
3958 | /* DECL is an in charge constructor, which is being defined. This will |
3959 | have had an in class declaration, from whence clones were | |
3960 | declared. An out-of-class definition can specify additional default | |
3961 | arguments. As it is the clones that are involved in overload | |
3962 | resolution, we must propagate the information from the DECL to its | |
00a17e31 | 3963 | clones. */ |
5f6eeeb3 NS |
3964 | |
3965 | void | |
94edc4ab | 3966 | adjust_clone_args (tree decl) |
5f6eeeb3 NS |
3967 | { |
3968 | tree clone; | |
3969 | ||
3970 | for (clone = TREE_CHAIN (decl); clone && DECL_CLONED_FUNCTION (clone); | |
3971 | clone = TREE_CHAIN (clone)) | |
3972 | { | |
3973 | tree orig_clone_parms = TYPE_ARG_TYPES (TREE_TYPE (clone)); | |
3974 | tree orig_decl_parms = TYPE_ARG_TYPES (TREE_TYPE (decl)); | |
3975 | tree decl_parms, clone_parms; | |
3976 | ||
3977 | clone_parms = orig_clone_parms; | |
3978 | ||
00a17e31 | 3979 | /* Skip the 'this' parameter. */ |
5f6eeeb3 NS |
3980 | orig_clone_parms = TREE_CHAIN (orig_clone_parms); |
3981 | orig_decl_parms = TREE_CHAIN (orig_decl_parms); | |
3982 | ||
3983 | if (DECL_HAS_IN_CHARGE_PARM_P (decl)) | |
3984 | orig_decl_parms = TREE_CHAIN (orig_decl_parms); | |
3985 | if (DECL_HAS_VTT_PARM_P (decl)) | |
3986 | orig_decl_parms = TREE_CHAIN (orig_decl_parms); | |
3987 | ||
3988 | clone_parms = orig_clone_parms; | |
3989 | if (DECL_HAS_VTT_PARM_P (clone)) | |
3990 | clone_parms = TREE_CHAIN (clone_parms); | |
3991 | ||
3992 | for (decl_parms = orig_decl_parms; decl_parms; | |
3993 | decl_parms = TREE_CHAIN (decl_parms), | |
3994 | clone_parms = TREE_CHAIN (clone_parms)) | |
3995 | { | |
3996 | my_friendly_assert (same_type_p (TREE_TYPE (decl_parms), | |
3997 | TREE_TYPE (clone_parms)), 20010424); | |
3998 | ||
3999 | if (TREE_PURPOSE (decl_parms) && !TREE_PURPOSE (clone_parms)) | |
4000 | { | |
4001 | /* A default parameter has been added. Adjust the | |
00a17e31 | 4002 | clone's parameters. */ |
5f6eeeb3 NS |
4003 | tree exceptions = TYPE_RAISES_EXCEPTIONS (TREE_TYPE (clone)); |
4004 | tree basetype = TYPE_METHOD_BASETYPE (TREE_TYPE (clone)); | |
4005 | tree type; | |
4006 | ||
4007 | clone_parms = orig_decl_parms; | |
4008 | ||
4009 | if (DECL_HAS_VTT_PARM_P (clone)) | |
4010 | { | |
4011 | clone_parms = tree_cons (TREE_PURPOSE (orig_clone_parms), | |
4012 | TREE_VALUE (orig_clone_parms), | |
4013 | clone_parms); | |
4014 | TREE_TYPE (clone_parms) = TREE_TYPE (orig_clone_parms); | |
4015 | } | |
4016 | type = build_cplus_method_type (basetype, | |
4017 | TREE_TYPE (TREE_TYPE (clone)), | |
4018 | clone_parms); | |
4019 | if (exceptions) | |
4020 | type = build_exception_variant (type, exceptions); | |
4021 | TREE_TYPE (clone) = type; | |
4022 | ||
4023 | clone_parms = NULL_TREE; | |
4024 | break; | |
4025 | } | |
4026 | } | |
4027 | my_friendly_assert (!clone_parms, 20010424); | |
4028 | } | |
4029 | } | |
4030 | ||
db9b2174 MM |
4031 | /* For each of the constructors and destructors in T, create an |
4032 | in-charge and not-in-charge variant. */ | |
4033 | ||
4034 | static void | |
94edc4ab | 4035 | clone_constructors_and_destructors (tree t) |
db9b2174 MM |
4036 | { |
4037 | tree fns; | |
4038 | ||
db9b2174 MM |
4039 | /* If for some reason we don't have a CLASSTYPE_METHOD_VEC, we bail |
4040 | out now. */ | |
4041 | if (!CLASSTYPE_METHOD_VEC (t)) | |
4042 | return; | |
4043 | ||
db9b2174 MM |
4044 | for (fns = CLASSTYPE_CONSTRUCTORS (t); fns; fns = OVL_NEXT (fns)) |
4045 | clone_function_decl (OVL_CURRENT (fns), /*update_method_vec_p=*/1); | |
298d6f60 MM |
4046 | for (fns = CLASSTYPE_DESTRUCTORS (t); fns; fns = OVL_NEXT (fns)) |
4047 | clone_function_decl (OVL_CURRENT (fns), /*update_method_vec_p=*/1); | |
db9b2174 MM |
4048 | } |
4049 | ||
58010b57 MM |
4050 | /* Remove all zero-width bit-fields from T. */ |
4051 | ||
4052 | static void | |
94edc4ab | 4053 | remove_zero_width_bit_fields (tree t) |
58010b57 MM |
4054 | { |
4055 | tree *fieldsp; | |
4056 | ||
4057 | fieldsp = &TYPE_FIELDS (t); | |
4058 | while (*fieldsp) | |
4059 | { | |
4060 | if (TREE_CODE (*fieldsp) == FIELD_DECL | |
4061 | && DECL_C_BIT_FIELD (*fieldsp) | |
4062 | && DECL_INITIAL (*fieldsp)) | |
4063 | *fieldsp = TREE_CHAIN (*fieldsp); | |
4064 | else | |
4065 | fieldsp = &TREE_CHAIN (*fieldsp); | |
4066 | } | |
4067 | } | |
4068 | ||
dbc957f1 MM |
4069 | /* Returns TRUE iff we need a cookie when dynamically allocating an |
4070 | array whose elements have the indicated class TYPE. */ | |
4071 | ||
4072 | static bool | |
94edc4ab | 4073 | type_requires_array_cookie (tree type) |
dbc957f1 MM |
4074 | { |
4075 | tree fns; | |
18fee3ee | 4076 | bool has_two_argument_delete_p = false; |
dbc957f1 MM |
4077 | |
4078 | my_friendly_assert (CLASS_TYPE_P (type), 20010712); | |
4079 | ||
4080 | /* If there's a non-trivial destructor, we need a cookie. In order | |
4081 | to iterate through the array calling the destructor for each | |
4082 | element, we'll have to know how many elements there are. */ | |
4083 | if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type)) | |
4084 | return true; | |
4085 | ||
4086 | /* If the usual deallocation function is a two-argument whose second | |
4087 | argument is of type `size_t', then we have to pass the size of | |
4088 | the array to the deallocation function, so we will need to store | |
4089 | a cookie. */ | |
4090 | fns = lookup_fnfields (TYPE_BINFO (type), | |
4091 | ansi_opname (VEC_DELETE_EXPR), | |
4092 | /*protect=*/0); | |
4093 | /* If there are no `operator []' members, or the lookup is | |
4094 | ambiguous, then we don't need a cookie. */ | |
4095 | if (!fns || fns == error_mark_node) | |
4096 | return false; | |
4097 | /* Loop through all of the functions. */ | |
50ad9642 | 4098 | for (fns = BASELINK_FUNCTIONS (fns); fns; fns = OVL_NEXT (fns)) |
dbc957f1 MM |
4099 | { |
4100 | tree fn; | |
4101 | tree second_parm; | |
4102 | ||
4103 | /* Select the current function. */ | |
4104 | fn = OVL_CURRENT (fns); | |
4105 | /* See if this function is a one-argument delete function. If | |
4106 | it is, then it will be the usual deallocation function. */ | |
4107 | second_parm = TREE_CHAIN (TYPE_ARG_TYPES (TREE_TYPE (fn))); | |
4108 | if (second_parm == void_list_node) | |
4109 | return false; | |
4110 | /* Otherwise, if we have a two-argument function and the second | |
4111 | argument is `size_t', it will be the usual deallocation | |
4112 | function -- unless there is one-argument function, too. */ | |
4113 | if (TREE_CHAIN (second_parm) == void_list_node | |
4114 | && same_type_p (TREE_VALUE (second_parm), sizetype)) | |
4115 | has_two_argument_delete_p = true; | |
4116 | } | |
4117 | ||
4118 | return has_two_argument_delete_p; | |
4119 | } | |
4120 | ||
607cf131 MM |
4121 | /* Check the validity of the bases and members declared in T. Add any |
4122 | implicitly-generated functions (like copy-constructors and | |
4123 | assignment operators). Compute various flag bits (like | |
4124 | CLASSTYPE_NON_POD_T) for T. This routine works purely at the C++ | |
4125 | level: i.e., independently of the ABI in use. */ | |
4126 | ||
4127 | static void | |
58731fd1 | 4128 | check_bases_and_members (tree t) |
607cf131 MM |
4129 | { |
4130 | /* Nonzero if we are not allowed to generate a default constructor | |
4131 | for this case. */ | |
4132 | int cant_have_default_ctor; | |
4133 | /* Nonzero if the implicitly generated copy constructor should take | |
4134 | a non-const reference argument. */ | |
4135 | int cant_have_const_ctor; | |
4136 | /* Nonzero if the the implicitly generated assignment operator | |
4137 | should take a non-const reference argument. */ | |
4138 | int no_const_asn_ref; | |
4139 | tree access_decls; | |
4140 | ||
4141 | /* By default, we use const reference arguments and generate default | |
4142 | constructors. */ | |
4143 | cant_have_default_ctor = 0; | |
4144 | cant_have_const_ctor = 0; | |
4145 | no_const_asn_ref = 0; | |
4146 | ||
00a17e31 | 4147 | /* Check all the base-classes. */ |
607cf131 MM |
4148 | check_bases (t, &cant_have_default_ctor, &cant_have_const_ctor, |
4149 | &no_const_asn_ref); | |
4150 | ||
4151 | /* Check all the data member declarations. */ | |
58731fd1 | 4152 | check_field_decls (t, &access_decls, |
607cf131 MM |
4153 | &cant_have_default_ctor, |
4154 | &cant_have_const_ctor, | |
4155 | &no_const_asn_ref); | |
4156 | ||
4157 | /* Check all the method declarations. */ | |
4158 | check_methods (t); | |
4159 | ||
bbd15aac MM |
4160 | /* A nearly-empty class has to be vptr-containing; a nearly empty |
4161 | class contains just a vptr. */ | |
4162 | if (!TYPE_CONTAINS_VPTR_P (t)) | |
f9c528ea MM |
4163 | CLASSTYPE_NEARLY_EMPTY_P (t) = 0; |
4164 | ||
607cf131 MM |
4165 | /* Do some bookkeeping that will guide the generation of implicitly |
4166 | declared member functions. */ | |
4167 | TYPE_HAS_COMPLEX_INIT_REF (t) | |
3ef397c1 MM |
4168 | |= (TYPE_HAS_INIT_REF (t) |
4169 | || TYPE_USES_VIRTUAL_BASECLASSES (t) | |
4170 | || TYPE_POLYMORPHIC_P (t)); | |
607cf131 | 4171 | TYPE_NEEDS_CONSTRUCTING (t) |
3ef397c1 MM |
4172 | |= (TYPE_HAS_CONSTRUCTOR (t) |
4173 | || TYPE_USES_VIRTUAL_BASECLASSES (t) | |
4174 | || TYPE_POLYMORPHIC_P (t)); | |
4175 | CLASSTYPE_NON_AGGREGATE (t) |= (TYPE_HAS_CONSTRUCTOR (t) | |
4176 | || TYPE_POLYMORPHIC_P (t)); | |
607cf131 MM |
4177 | CLASSTYPE_NON_POD_P (t) |
4178 | |= (CLASSTYPE_NON_AGGREGATE (t) || TYPE_HAS_DESTRUCTOR (t) | |
4179 | || TYPE_HAS_ASSIGN_REF (t)); | |
4180 | TYPE_HAS_REAL_ASSIGN_REF (t) |= TYPE_HAS_ASSIGN_REF (t); | |
4181 | TYPE_HAS_COMPLEX_ASSIGN_REF (t) | |
0830ae44 | 4182 | |= TYPE_HAS_ASSIGN_REF (t) || TYPE_CONTAINS_VPTR_P (t); |
607cf131 MM |
4183 | |
4184 | /* Synthesize any needed methods. Note that methods will be synthesized | |
4185 | for anonymous unions; grok_x_components undoes that. */ | |
4186 | add_implicitly_declared_members (t, cant_have_default_ctor, | |
4187 | cant_have_const_ctor, | |
4188 | no_const_asn_ref); | |
4189 | ||
db9b2174 MM |
4190 | /* Create the in-charge and not-in-charge variants of constructors |
4191 | and destructors. */ | |
4192 | clone_constructors_and_destructors (t); | |
4193 | ||
aa52c1ff JM |
4194 | /* Process the using-declarations. */ |
4195 | for (; access_decls; access_decls = TREE_CHAIN (access_decls)) | |
4196 | handle_using_decl (TREE_VALUE (access_decls), t); | |
4197 | ||
607cf131 MM |
4198 | /* Build and sort the CLASSTYPE_METHOD_VEC. */ |
4199 | finish_struct_methods (t); | |
dbc957f1 MM |
4200 | |
4201 | /* Figure out whether or not we will need a cookie when dynamically | |
4202 | allocating an array of this type. */ | |
e2500fed | 4203 | TYPE_LANG_SPECIFIC (t)->u.c.vec_new_uses_cookie |
dbc957f1 | 4204 | = type_requires_array_cookie (t); |
607cf131 MM |
4205 | } |
4206 | ||
3ef397c1 | 4207 | /* If T needs a pointer to its virtual function table, set TYPE_VFIELD |
5c24fba6 MM |
4208 | accordingly. If a new vfield was created (because T doesn't have a |
4209 | primary base class), then the newly created field is returned. It | |
c35cce41 | 4210 | is not added to the TYPE_FIELDS list; it is the caller's |
e6858a84 NS |
4211 | responsibility to do that. Accumulate declared virtual functions |
4212 | on VIRTUALS_P. */ | |
3ef397c1 | 4213 | |
5c24fba6 | 4214 | static tree |
94edc4ab | 4215 | create_vtable_ptr (tree t, tree* virtuals_p) |
3ef397c1 MM |
4216 | { |
4217 | tree fn; | |
4218 | ||
e6858a84 | 4219 | /* Collect the virtual functions declared in T. */ |
3ef397c1 | 4220 | for (fn = TYPE_METHODS (t); fn; fn = TREE_CHAIN (fn)) |
e6858a84 NS |
4221 | if (DECL_VINDEX (fn) && !DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P (fn) |
4222 | && TREE_CODE (DECL_VINDEX (fn)) != INTEGER_CST) | |
4223 | { | |
4224 | tree new_virtual = make_node (TREE_LIST); | |
4225 | ||
4226 | BV_FN (new_virtual) = fn; | |
4227 | BV_DELTA (new_virtual) = integer_zero_node; | |
3ef397c1 | 4228 | |
e6858a84 NS |
4229 | TREE_CHAIN (new_virtual) = *virtuals_p; |
4230 | *virtuals_p = new_virtual; | |
4231 | } | |
4232 | ||
da3d4dfa MM |
4233 | /* If we couldn't find an appropriate base class, create a new field |
4234 | here. Even if there weren't any new virtual functions, we might need a | |
bbd15aac MM |
4235 | new virtual function table if we're supposed to include vptrs in |
4236 | all classes that need them. */ | |
e6858a84 | 4237 | if (!TYPE_VFIELD (t) && (*virtuals_p || TYPE_CONTAINS_VPTR_P (t))) |
3ef397c1 MM |
4238 | { |
4239 | /* We build this decl with vtbl_ptr_type_node, which is a | |
4240 | `vtable_entry_type*'. It might seem more precise to use | |
4241 | `vtable_entry_type (*)[N]' where N is the number of firtual | |
4242 | functions. However, that would require the vtable pointer in | |
4243 | base classes to have a different type than the vtable pointer | |
4244 | in derived classes. We could make that happen, but that | |
4245 | still wouldn't solve all the problems. In particular, the | |
4246 | type-based alias analysis code would decide that assignments | |
4247 | to the base class vtable pointer can't alias assignments to | |
4248 | the derived class vtable pointer, since they have different | |
4639c5c6 | 4249 | types. Thus, in a derived class destructor, where the base |
3ef397c1 MM |
4250 | class constructor was inlined, we could generate bad code for |
4251 | setting up the vtable pointer. | |
4252 | ||
4253 | Therefore, we use one type for all vtable pointers. We still | |
4254 | use a type-correct type; it's just doesn't indicate the array | |
4255 | bounds. That's better than using `void*' or some such; it's | |
4256 | cleaner, and it let's the alias analysis code know that these | |
4257 | stores cannot alias stores to void*! */ | |
0abe00c5 NS |
4258 | tree field; |
4259 | ||
4260 | field = build_decl (FIELD_DECL, get_vfield_name (t), vtbl_ptr_type_node); | |
4261 | SET_DECL_ASSEMBLER_NAME (field, get_identifier (VFIELD_BASE)); | |
4262 | DECL_VIRTUAL_P (field) = 1; | |
4263 | DECL_ARTIFICIAL (field) = 1; | |
4264 | DECL_FIELD_CONTEXT (field) = t; | |
4265 | DECL_FCONTEXT (field) = t; | |
0abe00c5 NS |
4266 | |
4267 | TYPE_VFIELD (t) = field; | |
4268 | ||
4269 | /* This class is non-empty. */ | |
58731fd1 | 4270 | CLASSTYPE_EMPTY_P (t) = 0; |
3ef397c1 | 4271 | |
1f84ec23 | 4272 | if (CLASSTYPE_N_BASECLASSES (t)) |
5c24fba6 MM |
4273 | /* If there were any baseclasses, they can't possibly be at |
4274 | offset zero any more, because that's where the vtable | |
4275 | pointer is. So, converting to a base class is going to | |
4276 | take work. */ | |
4277 | TYPE_BASE_CONVS_MAY_REQUIRE_CODE_P (t) = 1; | |
3ef397c1 | 4278 | |
0abe00c5 | 4279 | return field; |
3ef397c1 | 4280 | } |
5c24fba6 MM |
4281 | |
4282 | return NULL_TREE; | |
3ef397c1 MM |
4283 | } |
4284 | ||
2ef16140 MM |
4285 | /* Fixup the inline function given by INFO now that the class is |
4286 | complete. */ | |
08b962b0 | 4287 | |
2ef16140 | 4288 | static void |
94edc4ab | 4289 | fixup_pending_inline (tree fn) |
2ef16140 | 4290 | { |
0e5921e8 | 4291 | if (DECL_PENDING_INLINE_INFO (fn)) |
2ef16140 | 4292 | { |
0e5921e8 | 4293 | tree args = DECL_ARGUMENTS (fn); |
2ef16140 MM |
4294 | while (args) |
4295 | { | |
4296 | DECL_CONTEXT (args) = fn; | |
4297 | args = TREE_CHAIN (args); | |
4298 | } | |
4299 | } | |
4300 | } | |
08b962b0 | 4301 | |
2ef16140 MM |
4302 | /* Fixup the inline methods and friends in TYPE now that TYPE is |
4303 | complete. */ | |
08b962b0 | 4304 | |
2ef16140 | 4305 | static void |
94edc4ab | 4306 | fixup_inline_methods (tree type) |
08b962b0 | 4307 | { |
2ef16140 | 4308 | tree method = TYPE_METHODS (type); |
08b962b0 | 4309 | |
2ef16140 | 4310 | if (method && TREE_CODE (method) == TREE_VEC) |
08b962b0 | 4311 | { |
2ef16140 MM |
4312 | if (TREE_VEC_ELT (method, 1)) |
4313 | method = TREE_VEC_ELT (method, 1); | |
4314 | else if (TREE_VEC_ELT (method, 0)) | |
4315 | method = TREE_VEC_ELT (method, 0); | |
08b962b0 | 4316 | else |
2ef16140 | 4317 | method = TREE_VEC_ELT (method, 2); |
08b962b0 MM |
4318 | } |
4319 | ||
2ef16140 MM |
4320 | /* Do inline member functions. */ |
4321 | for (; method; method = TREE_CHAIN (method)) | |
0e5921e8 | 4322 | fixup_pending_inline (method); |
08b962b0 | 4323 | |
2ef16140 MM |
4324 | /* Do friends. */ |
4325 | for (method = CLASSTYPE_INLINE_FRIENDS (type); | |
4326 | method; | |
4327 | method = TREE_CHAIN (method)) | |
0e5921e8 | 4328 | fixup_pending_inline (TREE_VALUE (method)); |
351c54c8 | 4329 | CLASSTYPE_INLINE_FRIENDS (type) = NULL_TREE; |
2ef16140 | 4330 | } |
08b962b0 | 4331 | |
9d4c0187 MM |
4332 | /* Add OFFSET to all base types of BINFO which is a base in the |
4333 | hierarchy dominated by T. | |
80fd5f48 | 4334 | |
911a71a7 | 4335 | OFFSET, which is a type offset, is number of bytes. */ |
80fd5f48 MM |
4336 | |
4337 | static void | |
dbbf88d1 | 4338 | propagate_binfo_offsets (tree binfo, tree offset) |
80fd5f48 | 4339 | { |
911a71a7 MM |
4340 | int i; |
4341 | tree primary_binfo; | |
80fd5f48 | 4342 | |
911a71a7 MM |
4343 | /* Update BINFO's offset. */ |
4344 | BINFO_OFFSET (binfo) | |
4345 | = convert (sizetype, | |
4346 | size_binop (PLUS_EXPR, | |
4347 | convert (ssizetype, BINFO_OFFSET (binfo)), | |
4348 | offset)); | |
80fd5f48 | 4349 | |
911a71a7 MM |
4350 | /* Find the primary base class. */ |
4351 | primary_binfo = get_primary_binfo (binfo); | |
4352 | ||
4353 | /* Scan all of the bases, pushing the BINFO_OFFSET adjust | |
4354 | downwards. */ | |
4355 | for (i = -1; i < BINFO_N_BASETYPES (binfo); ++i) | |
80fd5f48 | 4356 | { |
911a71a7 | 4357 | tree base_binfo; |
80fd5f48 | 4358 | |
623fe76a NS |
4359 | /* On the first time through the loop, do the primary base. |
4360 | Because the primary base need not be an immediate base, we | |
4361 | must handle the primary base specially. */ | |
911a71a7 MM |
4362 | if (i == -1) |
4363 | { | |
4364 | if (!primary_binfo) | |
4365 | continue; | |
80fd5f48 | 4366 | |
911a71a7 MM |
4367 | base_binfo = primary_binfo; |
4368 | } | |
4369 | else | |
4370 | { | |
4371 | base_binfo = BINFO_BASETYPE (binfo, i); | |
4372 | /* Don't do the primary base twice. */ | |
4373 | if (base_binfo == primary_binfo) | |
4374 | continue; | |
4375 | } | |
4376 | ||
623fe76a | 4377 | /* Skip virtual bases that aren't our canonical primary base. */ |
911a71a7 | 4378 | if (TREE_VIA_VIRTUAL (base_binfo) |
dbbf88d1 | 4379 | && BINFO_PRIMARY_BASE_OF (base_binfo) != binfo) |
911a71a7 MM |
4380 | continue; |
4381 | ||
dbbf88d1 | 4382 | propagate_binfo_offsets (base_binfo, offset); |
911a71a7 | 4383 | } |
9d4c0187 MM |
4384 | } |
4385 | ||
17bbb839 | 4386 | /* Set BINFO_OFFSET for all of the virtual bases for RLI->T. Update |
c20118a8 MM |
4387 | TYPE_ALIGN and TYPE_SIZE for T. OFFSETS gives the location of |
4388 | empty subobjects of T. */ | |
80fd5f48 | 4389 | |
d2c5305b | 4390 | static void |
17bbb839 | 4391 | layout_virtual_bases (record_layout_info rli, splay_tree offsets) |
80fd5f48 | 4392 | { |
dbbf88d1 | 4393 | tree vbase; |
17bbb839 | 4394 | tree t = rli->t; |
eca7f13c | 4395 | bool first_vbase = true; |
17bbb839 | 4396 | tree *next_field; |
9785e4b1 MM |
4397 | |
4398 | if (CLASSTYPE_N_BASECLASSES (t) == 0) | |
4399 | return; | |
4400 | ||
17bbb839 MM |
4401 | if (!abi_version_at_least(2)) |
4402 | { | |
4403 | /* In G++ 3.2, we incorrectly rounded the size before laying out | |
4404 | the virtual bases. */ | |
4405 | finish_record_layout (rli, /*free_p=*/false); | |
9785e4b1 | 4406 | #ifdef STRUCTURE_SIZE_BOUNDARY |
17bbb839 MM |
4407 | /* Packed structures don't need to have minimum size. */ |
4408 | if (! TYPE_PACKED (t)) | |
fc555370 | 4409 | TYPE_ALIGN (t) = MAX (TYPE_ALIGN (t), (unsigned) STRUCTURE_SIZE_BOUNDARY); |
9785e4b1 | 4410 | #endif |
17bbb839 MM |
4411 | rli->offset = TYPE_SIZE_UNIT (t); |
4412 | rli->bitpos = bitsize_zero_node; | |
4413 | rli->record_align = TYPE_ALIGN (t); | |
4414 | } | |
80fd5f48 | 4415 | |
17bbb839 MM |
4416 | /* Find the last field. The artificial fields created for virtual |
4417 | bases will go after the last extant field to date. */ | |
4418 | next_field = &TYPE_FIELDS (t); | |
4419 | while (*next_field) | |
4420 | next_field = &TREE_CHAIN (*next_field); | |
80fd5f48 | 4421 | |
9d4c0187 | 4422 | /* Go through the virtual bases, allocating space for each virtual |
3461fba7 NS |
4423 | base that is not already a primary base class. These are |
4424 | allocated in inheritance graph order. */ | |
dbbf88d1 | 4425 | for (vbase = TYPE_BINFO (t); vbase; vbase = TREE_CHAIN (vbase)) |
c35cce41 | 4426 | { |
dbbf88d1 | 4427 | if (!TREE_VIA_VIRTUAL (vbase)) |
1f84ec23 | 4428 | continue; |
eca7f13c | 4429 | |
9965d119 | 4430 | if (!BINFO_PRIMARY_P (vbase)) |
c35cce41 | 4431 | { |
17bbb839 MM |
4432 | tree basetype = TREE_TYPE (vbase); |
4433 | ||
c35cce41 MM |
4434 | /* This virtual base is not a primary base of any class in the |
4435 | hierarchy, so we have to add space for it. */ | |
58731fd1 | 4436 | next_field = build_base_field (rli, vbase, |
17bbb839 | 4437 | offsets, next_field); |
9785e4b1 | 4438 | |
eca7f13c MM |
4439 | /* If the first virtual base might have been placed at a |
4440 | lower address, had we started from CLASSTYPE_SIZE, rather | |
4441 | than TYPE_SIZE, issue a warning. There can be both false | |
4442 | positives and false negatives from this warning in rare | |
4443 | cases; to deal with all the possibilities would probably | |
4444 | require performing both layout algorithms and comparing | |
4445 | the results which is not particularly tractable. */ | |
4446 | if (warn_abi | |
4447 | && first_vbase | |
17bbb839 MM |
4448 | && (tree_int_cst_lt |
4449 | (size_binop (CEIL_DIV_EXPR, | |
4450 | round_up (CLASSTYPE_SIZE (t), | |
4451 | CLASSTYPE_ALIGN (basetype)), | |
4452 | bitsize_unit_node), | |
4453 | BINFO_OFFSET (vbase)))) | |
eca7f13c MM |
4454 | warning ("offset of virtual base `%T' is not ABI-compliant and may change in a future version of GCC", |
4455 | basetype); | |
4456 | ||
eca7f13c | 4457 | first_vbase = false; |
c35cce41 MM |
4458 | } |
4459 | } | |
80fd5f48 MM |
4460 | } |
4461 | ||
ba9a991f MM |
4462 | /* Returns the offset of the byte just past the end of the base class |
4463 | BINFO. */ | |
4464 | ||
4465 | static tree | |
4466 | end_of_base (tree binfo) | |
4467 | { | |
4468 | tree size; | |
4469 | ||
4470 | if (is_empty_class (BINFO_TYPE (binfo))) | |
4471 | /* An empty class has zero CLASSTYPE_SIZE_UNIT, but we need to | |
4472 | allocate some space for it. It cannot have virtual bases, so | |
4473 | TYPE_SIZE_UNIT is fine. */ | |
4474 | size = TYPE_SIZE_UNIT (BINFO_TYPE (binfo)); | |
4475 | else | |
4476 | size = CLASSTYPE_SIZE_UNIT (BINFO_TYPE (binfo)); | |
4477 | ||
4478 | return size_binop (PLUS_EXPR, BINFO_OFFSET (binfo), size); | |
4479 | } | |
4480 | ||
9785e4b1 MM |
4481 | /* Returns the offset of the byte just past the end of the base class |
4482 | with the highest offset in T. If INCLUDE_VIRTUALS_P is zero, then | |
4483 | only non-virtual bases are included. */ | |
80fd5f48 | 4484 | |
17bbb839 | 4485 | static tree |
94edc4ab | 4486 | end_of_class (tree t, int include_virtuals_p) |
80fd5f48 | 4487 | { |
17bbb839 | 4488 | tree result = size_zero_node; |
ba9a991f MM |
4489 | tree binfo; |
4490 | tree offset; | |
9785e4b1 | 4491 | int i; |
80fd5f48 | 4492 | |
9785e4b1 MM |
4493 | for (i = 0; i < CLASSTYPE_N_BASECLASSES (t); ++i) |
4494 | { | |
ba9a991f | 4495 | binfo = BINFO_BASETYPE (TYPE_BINFO (t), i); |
9785e4b1 MM |
4496 | |
4497 | if (!include_virtuals_p | |
ba9a991f | 4498 | && TREE_VIA_VIRTUAL (binfo) |
8234c6c1 | 4499 | && BINFO_PRIMARY_BASE_OF (binfo) != TYPE_BINFO (t)) |
9785e4b1 | 4500 | continue; |
80fd5f48 | 4501 | |
ba9a991f | 4502 | offset = end_of_base (binfo); |
17bbb839 MM |
4503 | if (INT_CST_LT_UNSIGNED (result, offset)) |
4504 | result = offset; | |
9785e4b1 | 4505 | } |
80fd5f48 | 4506 | |
ba9a991f MM |
4507 | /* G++ 3.2 did not check indirect virtual bases. */ |
4508 | if (abi_version_at_least (2) && include_virtuals_p) | |
4509 | for (binfo = CLASSTYPE_VBASECLASSES (t); | |
4510 | binfo; | |
4511 | binfo = TREE_CHAIN (binfo)) | |
4512 | { | |
4513 | offset = end_of_base (TREE_VALUE (binfo)); | |
4514 | if (INT_CST_LT_UNSIGNED (result, offset)) | |
4515 | result = offset; | |
4516 | } | |
4517 | ||
9785e4b1 | 4518 | return result; |
80fd5f48 MM |
4519 | } |
4520 | ||
17bbb839 | 4521 | /* Warn about bases of T that are inaccessible because they are |
78b45a24 MM |
4522 | ambiguous. For example: |
4523 | ||
4524 | struct S {}; | |
4525 | struct T : public S {}; | |
4526 | struct U : public S, public T {}; | |
4527 | ||
4528 | Here, `(S*) new U' is not allowed because there are two `S' | |
4529 | subobjects of U. */ | |
4530 | ||
4531 | static void | |
94edc4ab | 4532 | warn_about_ambiguous_bases (tree t) |
78b45a24 MM |
4533 | { |
4534 | int i; | |
17bbb839 MM |
4535 | tree vbases; |
4536 | tree basetype; | |
78b45a24 | 4537 | |
17bbb839 | 4538 | /* Check direct bases. */ |
78b45a24 MM |
4539 | for (i = 0; i < CLASSTYPE_N_BASECLASSES (t); ++i) |
4540 | { | |
17bbb839 | 4541 | basetype = TYPE_BINFO_BASETYPE (t, i); |
78b45a24 | 4542 | |
2db1ab2d | 4543 | if (!lookup_base (t, basetype, ba_ignore | ba_quiet, NULL)) |
33bd39a2 | 4544 | warning ("direct base `%T' inaccessible in `%T' due to ambiguity", |
17bbb839 | 4545 | basetype, t); |
78b45a24 | 4546 | } |
17bbb839 MM |
4547 | |
4548 | /* Check for ambiguous virtual bases. */ | |
4549 | if (extra_warnings) | |
4550 | for (vbases = CLASSTYPE_VBASECLASSES (t); | |
4551 | vbases; | |
4552 | vbases = TREE_CHAIN (vbases)) | |
4553 | { | |
4554 | basetype = BINFO_TYPE (TREE_VALUE (vbases)); | |
4555 | ||
4556 | if (!lookup_base (t, basetype, ba_ignore | ba_quiet, NULL)) | |
4557 | warning ("virtual base `%T' inaccessible in `%T' due to ambiguity", | |
4558 | basetype, t); | |
4559 | } | |
78b45a24 MM |
4560 | } |
4561 | ||
c20118a8 MM |
4562 | /* Compare two INTEGER_CSTs K1 and K2. */ |
4563 | ||
4564 | static int | |
94edc4ab | 4565 | splay_tree_compare_integer_csts (splay_tree_key k1, splay_tree_key k2) |
c20118a8 MM |
4566 | { |
4567 | return tree_int_cst_compare ((tree) k1, (tree) k2); | |
4568 | } | |
4569 | ||
17bbb839 MM |
4570 | /* Increase the size indicated in RLI to account for empty classes |
4571 | that are "off the end" of the class. */ | |
4572 | ||
4573 | static void | |
4574 | include_empty_classes (record_layout_info rli) | |
4575 | { | |
4576 | tree eoc; | |
e3ccdd50 | 4577 | tree rli_size; |
17bbb839 MM |
4578 | |
4579 | /* It might be the case that we grew the class to allocate a | |
4580 | zero-sized base class. That won't be reflected in RLI, yet, | |
4581 | because we are willing to overlay multiple bases at the same | |
4582 | offset. However, now we need to make sure that RLI is big enough | |
4583 | to reflect the entire class. */ | |
4584 | eoc = end_of_class (rli->t, | |
4585 | CLASSTYPE_AS_BASE (rli->t) != NULL_TREE); | |
e3ccdd50 MM |
4586 | rli_size = rli_size_unit_so_far (rli); |
4587 | if (TREE_CODE (rli_size) == INTEGER_CST | |
4588 | && INT_CST_LT_UNSIGNED (rli_size, eoc)) | |
17bbb839 | 4589 | { |
e3ccdd50 MM |
4590 | rli->bitpos = round_up (rli->bitpos, BITS_PER_UNIT); |
4591 | rli->bitpos | |
4592 | = size_binop (PLUS_EXPR, | |
4593 | rli->bitpos, | |
4594 | size_binop (MULT_EXPR, | |
4595 | convert (bitsizetype, | |
4596 | size_binop (MINUS_EXPR, | |
4597 | eoc, rli_size)), | |
4598 | bitsize_int (BITS_PER_UNIT))); | |
4599 | normalize_rli (rli); | |
17bbb839 MM |
4600 | } |
4601 | } | |
4602 | ||
2ef16140 MM |
4603 | /* Calculate the TYPE_SIZE, TYPE_ALIGN, etc for T. Calculate |
4604 | BINFO_OFFSETs for all of the base-classes. Position the vtable | |
00a17e31 | 4605 | pointer. Accumulate declared virtual functions on VIRTUALS_P. */ |
607cf131 | 4606 | |
2ef16140 | 4607 | static void |
e93ee644 | 4608 | layout_class_type (tree t, tree *virtuals_p) |
2ef16140 | 4609 | { |
5c24fba6 MM |
4610 | tree non_static_data_members; |
4611 | tree field; | |
4612 | tree vptr; | |
4613 | record_layout_info rli; | |
c20118a8 MM |
4614 | /* Maps offsets (represented as INTEGER_CSTs) to a TREE_LIST of |
4615 | types that appear at that offset. */ | |
4616 | splay_tree empty_base_offsets; | |
eca7f13c MM |
4617 | /* True if the last field layed out was a bit-field. */ |
4618 | bool last_field_was_bitfield = false; | |
17bbb839 MM |
4619 | /* The location at which the next field should be inserted. */ |
4620 | tree *next_field; | |
4621 | /* T, as a base class. */ | |
4622 | tree base_t; | |
5c24fba6 MM |
4623 | |
4624 | /* Keep track of the first non-static data member. */ | |
4625 | non_static_data_members = TYPE_FIELDS (t); | |
4626 | ||
770ae6cc RK |
4627 | /* Start laying out the record. */ |
4628 | rli = start_record_layout (t); | |
534170eb | 4629 | |
8026246f MM |
4630 | /* If possible, we reuse the virtual function table pointer from one |
4631 | of our base classes. */ | |
e93ee644 | 4632 | determine_primary_base (t); |
8026246f | 4633 | |
5c24fba6 | 4634 | /* Create a pointer to our virtual function table. */ |
58731fd1 | 4635 | vptr = create_vtable_ptr (t, virtuals_p); |
5c24fba6 | 4636 | |
3461fba7 | 4637 | /* The vptr is always the first thing in the class. */ |
1f84ec23 | 4638 | if (vptr) |
5c24fba6 | 4639 | { |
17bbb839 MM |
4640 | TREE_CHAIN (vptr) = TYPE_FIELDS (t); |
4641 | TYPE_FIELDS (t) = vptr; | |
4642 | next_field = &TREE_CHAIN (vptr); | |
770ae6cc | 4643 | place_field (rli, vptr); |
5c24fba6 | 4644 | } |
17bbb839 MM |
4645 | else |
4646 | next_field = &TYPE_FIELDS (t); | |
5c24fba6 | 4647 | |
72a50ab0 | 4648 | /* Build FIELD_DECLs for all of the non-virtual base-types. */ |
c20118a8 MM |
4649 | empty_base_offsets = splay_tree_new (splay_tree_compare_integer_csts, |
4650 | NULL, NULL); | |
58731fd1 | 4651 | build_base_fields (rli, empty_base_offsets, next_field); |
06d9f09f | 4652 | |
5c24fba6 | 4653 | /* Layout the non-static data members. */ |
770ae6cc | 4654 | for (field = non_static_data_members; field; field = TREE_CHAIN (field)) |
5c24fba6 | 4655 | { |
01955e96 MM |
4656 | tree type; |
4657 | tree padding; | |
5c24fba6 MM |
4658 | |
4659 | /* We still pass things that aren't non-static data members to | |
4660 | the back-end, in case it wants to do something with them. */ | |
4661 | if (TREE_CODE (field) != FIELD_DECL) | |
4662 | { | |
770ae6cc | 4663 | place_field (rli, field); |
0154eaa8 MM |
4664 | /* If the static data member has incomplete type, keep track |
4665 | of it so that it can be completed later. (The handling | |
4666 | of pending statics in finish_record_layout is | |
4667 | insufficient; consider: | |
4668 | ||
4669 | struct S1; | |
4670 | struct S2 { static S1 s1; }; | |
4671 | ||
4672 | At this point, finish_record_layout will be called, but | |
4673 | S1 is still incomplete.) */ | |
4674 | if (TREE_CODE (field) == VAR_DECL) | |
4675 | maybe_register_incomplete_var (field); | |
5c24fba6 MM |
4676 | continue; |
4677 | } | |
4678 | ||
01955e96 | 4679 | type = TREE_TYPE (field); |
1e099144 MM |
4680 | |
4681 | padding = NULL_TREE; | |
01955e96 MM |
4682 | |
4683 | /* If this field is a bit-field whose width is greater than its | |
3461fba7 NS |
4684 | type, then there are some special rules for allocating |
4685 | it. */ | |
01955e96 | 4686 | if (DECL_C_BIT_FIELD (field) |
1f84ec23 | 4687 | && INT_CST_LT (TYPE_SIZE (type), DECL_SIZE (field))) |
01955e96 MM |
4688 | { |
4689 | integer_type_kind itk; | |
4690 | tree integer_type; | |
555456b1 | 4691 | bool was_unnamed_p = false; |
01955e96 MM |
4692 | /* We must allocate the bits as if suitably aligned for the |
4693 | longest integer type that fits in this many bits. type | |
4694 | of the field. Then, we are supposed to use the left over | |
4695 | bits as additional padding. */ | |
4696 | for (itk = itk_char; itk != itk_none; ++itk) | |
4697 | if (INT_CST_LT (DECL_SIZE (field), | |
4698 | TYPE_SIZE (integer_types[itk]))) | |
4699 | break; | |
4700 | ||
4701 | /* ITK now indicates a type that is too large for the | |
4702 | field. We have to back up by one to find the largest | |
4703 | type that fits. */ | |
4704 | integer_type = integer_types[itk - 1]; | |
2d3e278d | 4705 | |
1e099144 MM |
4706 | /* Figure out how much additional padding is required. GCC |
4707 | 3.2 always created a padding field, even if it had zero | |
4708 | width. */ | |
4709 | if (!abi_version_at_least (2) | |
4710 | || INT_CST_LT (TYPE_SIZE (integer_type), DECL_SIZE (field))) | |
2d3e278d | 4711 | { |
1e099144 MM |
4712 | if (abi_version_at_least (2) && TREE_CODE (t) == UNION_TYPE) |
4713 | /* In a union, the padding field must have the full width | |
4714 | of the bit-field; all fields start at offset zero. */ | |
4715 | padding = DECL_SIZE (field); | |
4716 | else | |
4717 | { | |
4718 | if (warn_abi && TREE_CODE (t) == UNION_TYPE) | |
4719 | warning ("size assigned to `%T' may not be " | |
4720 | "ABI-compliant and may change in a future " | |
4721 | "version of GCC", | |
4722 | t); | |
4723 | padding = size_binop (MINUS_EXPR, DECL_SIZE (field), | |
4724 | TYPE_SIZE (integer_type)); | |
4725 | } | |
2d3e278d | 4726 | } |
c9372112 | 4727 | #ifdef PCC_BITFIELD_TYPE_MATTERS |
63e5f567 MM |
4728 | /* An unnamed bitfield does not normally affect the |
4729 | alignment of the containing class on a target where | |
4730 | PCC_BITFIELD_TYPE_MATTERS. But, the C++ ABI does not | |
4731 | make any exceptions for unnamed bitfields when the | |
4732 | bitfields are longer than their types. Therefore, we | |
4733 | temporarily give the field a name. */ | |
4734 | if (PCC_BITFIELD_TYPE_MATTERS && !DECL_NAME (field)) | |
4735 | { | |
4736 | was_unnamed_p = true; | |
4737 | DECL_NAME (field) = make_anon_name (); | |
4738 | } | |
c9372112 | 4739 | #endif |
01955e96 MM |
4740 | DECL_SIZE (field) = TYPE_SIZE (integer_type); |
4741 | DECL_ALIGN (field) = TYPE_ALIGN (integer_type); | |
11cf4d18 | 4742 | DECL_USER_ALIGN (field) = TYPE_USER_ALIGN (integer_type); |
555456b1 MM |
4743 | layout_nonempty_base_or_field (rli, field, NULL_TREE, |
4744 | empty_base_offsets); | |
4745 | if (was_unnamed_p) | |
4746 | DECL_NAME (field) = NULL_TREE; | |
4747 | /* Now that layout has been performed, set the size of the | |
4748 | field to the size of its declared type; the rest of the | |
4749 | field is effectively invisible. */ | |
4750 | DECL_SIZE (field) = TYPE_SIZE (type); | |
01955e96 | 4751 | } |
555456b1 MM |
4752 | else |
4753 | layout_nonempty_base_or_field (rli, field, NULL_TREE, | |
4754 | empty_base_offsets); | |
01955e96 | 4755 | |
2003cd37 MM |
4756 | /* Remember the location of any empty classes in FIELD. */ |
4757 | if (abi_version_at_least (2)) | |
4758 | record_subobject_offsets (TREE_TYPE (field), | |
4759 | byte_position(field), | |
4760 | empty_base_offsets, | |
4761 | /*vbases_p=*/1); | |
4762 | ||
eca7f13c MM |
4763 | /* If a bit-field does not immediately follow another bit-field, |
4764 | and yet it starts in the middle of a byte, we have failed to | |
4765 | comply with the ABI. */ | |
4766 | if (warn_abi | |
4767 | && DECL_C_BIT_FIELD (field) | |
4768 | && !last_field_was_bitfield | |
4769 | && !integer_zerop (size_binop (TRUNC_MOD_EXPR, | |
4770 | DECL_FIELD_BIT_OFFSET (field), | |
4771 | bitsize_unit_node))) | |
4772 | cp_warning_at ("offset of `%D' is not ABI-compliant and may change in a future version of GCC", | |
4773 | field); | |
4774 | ||
956d9305 MM |
4775 | /* G++ used to use DECL_FIELD_OFFSET as if it were the byte |
4776 | offset of the field. */ | |
4777 | if (warn_abi | |
4778 | && !tree_int_cst_equal (DECL_FIELD_OFFSET (field), | |
4779 | byte_position (field)) | |
4780 | && contains_empty_class_p (TREE_TYPE (field))) | |
4781 | cp_warning_at ("`%D' contains empty classes which may cause base " | |
4782 | "classes to be placed at different locations in a " | |
4783 | "future version of GCC", | |
4784 | field); | |
4785 | ||
01955e96 MM |
4786 | /* If we needed additional padding after this field, add it |
4787 | now. */ | |
4788 | if (padding) | |
4789 | { | |
4790 | tree padding_field; | |
4791 | ||
4792 | padding_field = build_decl (FIELD_DECL, | |
4793 | NULL_TREE, | |
4794 | char_type_node); | |
4795 | DECL_BIT_FIELD (padding_field) = 1; | |
4796 | DECL_SIZE (padding_field) = padding; | |
1e099144 | 4797 | DECL_CONTEXT (padding_field) = t; |
c20118a8 MM |
4798 | layout_nonempty_base_or_field (rli, padding_field, |
4799 | NULL_TREE, | |
17bbb839 | 4800 | empty_base_offsets); |
01955e96 | 4801 | } |
eca7f13c MM |
4802 | |
4803 | last_field_was_bitfield = DECL_C_BIT_FIELD (field); | |
5c24fba6 MM |
4804 | } |
4805 | ||
17bbb839 | 4806 | if (abi_version_at_least (2) && !integer_zerop (rli->bitpos)) |
e3ccdd50 MM |
4807 | { |
4808 | /* Make sure that we are on a byte boundary so that the size of | |
4809 | the class without virtual bases will always be a round number | |
4810 | of bytes. */ | |
4811 | rli->bitpos = round_up (rli->bitpos, BITS_PER_UNIT); | |
4812 | normalize_rli (rli); | |
4813 | } | |
17bbb839 | 4814 | |
8a874cb4 MM |
4815 | /* G++ 3.2 does not allow virtual bases to be overlaid with tail |
4816 | padding. */ | |
4817 | if (!abi_version_at_least (2)) | |
4818 | include_empty_classes(rli); | |
58010b57 | 4819 | |
3ef397c1 MM |
4820 | /* Delete all zero-width bit-fields from the list of fields. Now |
4821 | that the type is laid out they are no longer important. */ | |
4822 | remove_zero_width_bit_fields (t); | |
4823 | ||
17bbb839 MM |
4824 | /* Create the version of T used for virtual bases. We do not use |
4825 | make_aggr_type for this version; this is an artificial type. For | |
4826 | a POD type, we just reuse T. */ | |
58731fd1 | 4827 | if (CLASSTYPE_NON_POD_P (t) || CLASSTYPE_EMPTY_P (t)) |
06ceef4e | 4828 | { |
17bbb839 MM |
4829 | base_t = make_node (TREE_CODE (t)); |
4830 | ||
58731fd1 MM |
4831 | /* Set the size and alignment for the new type. In G++ 3.2, all |
4832 | empty classes were considered to have size zero when used as | |
4833 | base classes. */ | |
4834 | if (!abi_version_at_least (2) && CLASSTYPE_EMPTY_P (t)) | |
4835 | { | |
4836 | TYPE_SIZE (base_t) = bitsize_zero_node; | |
4837 | TYPE_SIZE_UNIT (base_t) = size_zero_node; | |
4838 | if (warn_abi && !integer_zerop (rli_size_unit_so_far (rli))) | |
4839 | warning ("layout of classes derived from empty class `%T' " | |
4840 | "may change in a future version of GCC", | |
4841 | t); | |
4842 | } | |
4843 | else | |
4844 | { | |
6b99d1c0 MM |
4845 | tree eoc; |
4846 | ||
4847 | /* If the ABI version is not at least two, and the last | |
4848 | field was a bit-field, RLI may not be on a byte | |
4849 | boundary. In particular, rli_size_unit_so_far might | |
4850 | indicate the last complete byte, while rli_size_so_far | |
4851 | indicates the total number of bits used. Therefore, | |
4852 | rli_size_so_far, rather than rli_size_unit_so_far, is | |
4853 | used to compute TYPE_SIZE_UNIT. */ | |
4854 | eoc = end_of_class (t, /*include_virtuals_p=*/0); | |
8a874cb4 MM |
4855 | TYPE_SIZE_UNIT (base_t) |
4856 | = size_binop (MAX_EXPR, | |
6b99d1c0 MM |
4857 | convert (sizetype, |
4858 | size_binop (CEIL_DIV_EXPR, | |
4859 | rli_size_so_far (rli), | |
4860 | bitsize_int (BITS_PER_UNIT))), | |
4861 | eoc); | |
8a874cb4 MM |
4862 | TYPE_SIZE (base_t) |
4863 | = size_binop (MAX_EXPR, | |
4864 | rli_size_so_far (rli), | |
4865 | size_binop (MULT_EXPR, | |
6b99d1c0 | 4866 | convert (bitsizetype, eoc), |
8a874cb4 | 4867 | bitsize_int (BITS_PER_UNIT))); |
58731fd1 | 4868 | } |
17bbb839 MM |
4869 | TYPE_ALIGN (base_t) = rli->record_align; |
4870 | TYPE_USER_ALIGN (base_t) = TYPE_USER_ALIGN (t); | |
4871 | ||
4872 | /* Copy the fields from T. */ | |
4873 | next_field = &TYPE_FIELDS (base_t); | |
4874 | for (field = TYPE_FIELDS (t); field; field = TREE_CHAIN (field)) | |
4875 | if (TREE_CODE (field) == FIELD_DECL) | |
4876 | { | |
4877 | *next_field = build_decl (FIELD_DECL, | |
4878 | DECL_NAME (field), | |
4879 | TREE_TYPE (field)); | |
4880 | DECL_CONTEXT (*next_field) = base_t; | |
4881 | DECL_FIELD_OFFSET (*next_field) = DECL_FIELD_OFFSET (field); | |
4882 | DECL_FIELD_BIT_OFFSET (*next_field) | |
4883 | = DECL_FIELD_BIT_OFFSET (field); | |
4884 | next_field = &TREE_CHAIN (*next_field); | |
4885 | } | |
4886 | ||
4887 | /* Record the base version of the type. */ | |
4888 | CLASSTYPE_AS_BASE (t) = base_t; | |
5a5cccaa | 4889 | TYPE_CONTEXT (base_t) = t; |
83b14b88 | 4890 | } |
1f84ec23 | 4891 | else |
17bbb839 | 4892 | CLASSTYPE_AS_BASE (t) = t; |
0b41abe6 | 4893 | |
5ec1192e MM |
4894 | /* Every empty class contains an empty class. */ |
4895 | if (CLASSTYPE_EMPTY_P (t)) | |
4896 | CLASSTYPE_CONTAINS_EMPTY_CLASS_P (t) = 1; | |
4897 | ||
8d08fdba MS |
4898 | /* Set the TYPE_DECL for this type to contain the right |
4899 | value for DECL_OFFSET, so that we can use it as part | |
4900 | of a COMPONENT_REF for multiple inheritance. */ | |
d2e5ee5c | 4901 | layout_decl (TYPE_MAIN_DECL (t), 0); |
8d08fdba | 4902 | |
7177d104 MS |
4903 | /* Now fix up any virtual base class types that we left lying |
4904 | around. We must get these done before we try to lay out the | |
5c24fba6 MM |
4905 | virtual function table. As a side-effect, this will remove the |
4906 | base subobject fields. */ | |
17bbb839 MM |
4907 | layout_virtual_bases (rli, empty_base_offsets); |
4908 | ||
4909 | /* Make sure that empty classes are reflected in RLI at this | |
4910 | point. */ | |
4911 | include_empty_classes(rli); | |
4912 | ||
4913 | /* Make sure not to create any structures with zero size. */ | |
58731fd1 | 4914 | if (integer_zerop (rli_size_unit_so_far (rli)) && CLASSTYPE_EMPTY_P (t)) |
17bbb839 MM |
4915 | place_field (rli, |
4916 | build_decl (FIELD_DECL, NULL_TREE, char_type_node)); | |
4917 | ||
4918 | /* Let the back-end lay out the type. */ | |
4919 | finish_record_layout (rli, /*free_p=*/true); | |
9785e4b1 | 4920 | |
17bbb839 MM |
4921 | /* Warn about bases that can't be talked about due to ambiguity. */ |
4922 | warn_about_ambiguous_bases (t); | |
78b45a24 | 4923 | |
9785e4b1 | 4924 | /* Clean up. */ |
c20118a8 | 4925 | splay_tree_delete (empty_base_offsets); |
2ef16140 | 4926 | } |
c35cce41 | 4927 | |
9aad8f83 MA |
4928 | /* Returns the virtual function with which the vtable for TYPE is |
4929 | emitted, or NULL_TREE if that heuristic is not applicable to TYPE. */ | |
4930 | ||
4931 | static tree | |
4932 | key_method (tree type) | |
4933 | { | |
4934 | tree method; | |
4935 | ||
4936 | if (TYPE_FOR_JAVA (type) | |
4937 | || processing_template_decl | |
4938 | || CLASSTYPE_TEMPLATE_INSTANTIATION (type) | |
4939 | || CLASSTYPE_INTERFACE_KNOWN (type)) | |
4940 | return NULL_TREE; | |
4941 | ||
4942 | for (method = TYPE_METHODS (type); method != NULL_TREE; | |
4943 | method = TREE_CHAIN (method)) | |
4944 | if (DECL_VINDEX (method) != NULL_TREE | |
4945 | && ! DECL_DECLARED_INLINE_P (method) | |
4946 | && ! DECL_PURE_VIRTUAL_P (method)) | |
4947 | return method; | |
4948 | ||
4949 | return NULL_TREE; | |
4950 | } | |
4951 | ||
548502d3 MM |
4952 | /* Perform processing required when the definition of T (a class type) |
4953 | is complete. */ | |
2ef16140 MM |
4954 | |
4955 | void | |
94edc4ab | 4956 | finish_struct_1 (tree t) |
2ef16140 MM |
4957 | { |
4958 | tree x; | |
00a17e31 | 4959 | /* A TREE_LIST. The TREE_VALUE of each node is a FUNCTION_DECL. */ |
e6858a84 | 4960 | tree virtuals = NULL_TREE; |
2ef16140 MM |
4961 | int n_fields = 0; |
4962 | tree vfield; | |
2ef16140 | 4963 | |
d0f062fb | 4964 | if (COMPLETE_TYPE_P (t)) |
2ef16140 MM |
4965 | { |
4966 | if (IS_AGGR_TYPE (t)) | |
33bd39a2 | 4967 | error ("redefinition of `%#T'", t); |
2ef16140 | 4968 | else |
a98facb0 | 4969 | abort (); |
2ef16140 MM |
4970 | popclass (); |
4971 | return; | |
4972 | } | |
4973 | ||
2ef16140 MM |
4974 | /* If this type was previously laid out as a forward reference, |
4975 | make sure we lay it out again. */ | |
2ef16140 | 4976 | TYPE_SIZE (t) = NULL_TREE; |
911a71a7 | 4977 | CLASSTYPE_PRIMARY_BINFO (t) = NULL_TREE; |
2ef16140 | 4978 | |
6d0a3f67 NS |
4979 | fixup_inline_methods (t); |
4980 | ||
5ec1192e MM |
4981 | /* Make assumptions about the class; we'll reset the flags if |
4982 | necessary. */ | |
58731fd1 MM |
4983 | CLASSTYPE_EMPTY_P (t) = 1; |
4984 | CLASSTYPE_NEARLY_EMPTY_P (t) = 1; | |
5ec1192e | 4985 | CLASSTYPE_CONTAINS_EMPTY_CLASS_P (t) = 0; |
58731fd1 | 4986 | |
2ef16140 | 4987 | /* Do end-of-class semantic processing: checking the validity of the |
03702748 | 4988 | bases and members and add implicitly generated methods. */ |
58731fd1 | 4989 | check_bases_and_members (t); |
2ef16140 | 4990 | |
9aad8f83 | 4991 | /* Find the key method */ |
a63996f1 | 4992 | if (TYPE_CONTAINS_VPTR_P (t)) |
9aad8f83 MA |
4993 | { |
4994 | CLASSTYPE_KEY_METHOD (t) = key_method (t); | |
4995 | ||
4996 | /* If a polymorphic class has no key method, we may emit the vtable | |
9bcb9aae | 4997 | in every translation unit where the class definition appears. */ |
9aad8f83 MA |
4998 | if (CLASSTYPE_KEY_METHOD (t) == NULL_TREE) |
4999 | keyed_classes = tree_cons (NULL_TREE, t, keyed_classes); | |
5000 | } | |
5001 | ||
2ef16140 | 5002 | /* Layout the class itself. */ |
e93ee644 | 5003 | layout_class_type (t, &virtuals); |
8ebeee52 | 5004 | |
d0cd8b44 | 5005 | /* Make sure that we get our own copy of the vfield FIELD_DECL. */ |
3ef397c1 | 5006 | vfield = TYPE_VFIELD (t); |
d60d223b | 5007 | if (vfield && CLASSTYPE_HAS_PRIMARY_BASE_P (t)) |
2986ae00 | 5008 | { |
d60d223b NS |
5009 | tree primary = CLASSTYPE_PRIMARY_BINFO (t); |
5010 | ||
5011 | my_friendly_assert (same_type_p (DECL_FIELD_CONTEXT (vfield), | |
5012 | BINFO_TYPE (primary)), | |
5013 | 20010726); | |
00a17e31 | 5014 | /* The vtable better be at the start. */ |
d60d223b NS |
5015 | my_friendly_assert (integer_zerop (DECL_FIELD_OFFSET (vfield)), |
5016 | 20010726); | |
5017 | my_friendly_assert (integer_zerop (BINFO_OFFSET (primary)), | |
5018 | 20010726); | |
5019 | ||
0acf7199 | 5020 | vfield = copy_decl (vfield); |
2986ae00 | 5021 | DECL_FIELD_CONTEXT (vfield) = t; |
d3a3fb6a | 5022 | TYPE_VFIELD (t) = vfield; |
2986ae00 | 5023 | } |
d60d223b NS |
5024 | else |
5025 | my_friendly_assert (!vfield || DECL_FIELD_CONTEXT (vfield) == t, 20010726); | |
4c6b7393 | 5026 | |
e93ee644 | 5027 | virtuals = modify_all_vtables (t, nreverse (virtuals)); |
db5ae43f | 5028 | |
23656158 MM |
5029 | /* If we created a new vtbl pointer for this class, add it to the |
5030 | list. */ | |
5031 | if (TYPE_VFIELD (t) && !CLASSTYPE_HAS_PRIMARY_BASE_P (t)) | |
5032 | CLASSTYPE_VFIELDS (t) | |
5033 | = chainon (CLASSTYPE_VFIELDS (t), build_tree_list (NULL_TREE, t)); | |
5034 | ||
5e19c053 | 5035 | /* If necessary, create the primary vtable for this class. */ |
e6858a84 | 5036 | if (virtuals || TYPE_CONTAINS_VPTR_P (t)) |
8d08fdba | 5037 | { |
8d08fdba | 5038 | /* We must enter these virtuals into the table. */ |
3ef397c1 | 5039 | if (!CLASSTYPE_HAS_PRIMARY_BASE_P (t)) |
da3d4dfa | 5040 | build_primary_vtable (NULL_TREE, t); |
dbbf88d1 | 5041 | else if (! BINFO_NEW_VTABLE_MARKED (TYPE_BINFO (t))) |
0533d788 MM |
5042 | /* Here we know enough to change the type of our virtual |
5043 | function table, but we will wait until later this function. */ | |
28531dd0 | 5044 | build_primary_vtable (CLASSTYPE_PRIMARY_BINFO (t), t); |
8d08fdba MS |
5045 | } |
5046 | ||
bbd15aac | 5047 | if (TYPE_CONTAINS_VPTR_P (t)) |
8d08fdba | 5048 | { |
e93ee644 MM |
5049 | int vindex; |
5050 | tree fn; | |
5051 | ||
1eb4bea9 MM |
5052 | if (TYPE_BINFO_VTABLE (t)) |
5053 | my_friendly_assert (DECL_VIRTUAL_P (TYPE_BINFO_VTABLE (t)), | |
5054 | 20000116); | |
5055 | if (!CLASSTYPE_HAS_PRIMARY_BASE_P (t)) | |
5056 | my_friendly_assert (TYPE_BINFO_VIRTUALS (t) == NULL_TREE, | |
5057 | 20000116); | |
5058 | ||
e6858a84 NS |
5059 | /* Add entries for virtual functions introduced by this class. */ |
5060 | TYPE_BINFO_VIRTUALS (t) = chainon (TYPE_BINFO_VIRTUALS (t), virtuals); | |
e93ee644 MM |
5061 | |
5062 | /* Set DECL_VINDEX for all functions declared in this class. */ | |
5063 | for (vindex = 0, fn = BINFO_VIRTUALS (TYPE_BINFO (t)); | |
5064 | fn; | |
5065 | fn = TREE_CHAIN (fn), | |
5066 | vindex += (TARGET_VTABLE_USES_DESCRIPTORS | |
5067 | ? TARGET_VTABLE_USES_DESCRIPTORS : 1)) | |
4977bab6 ZW |
5068 | { |
5069 | tree fndecl = BV_FN (fn); | |
5070 | ||
5071 | if (DECL_THUNK_P (fndecl)) | |
5072 | /* A thunk. We should never be calling this entry directly | |
5073 | from this vtable -- we'd use the entry for the non | |
5074 | thunk base function. */ | |
5075 | DECL_VINDEX (fndecl) = NULL_TREE; | |
5076 | else if (TREE_CODE (DECL_VINDEX (fndecl)) != INTEGER_CST) | |
5077 | DECL_VINDEX (fndecl) = build_shared_int_cst (vindex); | |
5078 | } | |
8d08fdba MS |
5079 | } |
5080 | ||
d2c5305b | 5081 | finish_struct_bits (t); |
8d08fdba | 5082 | |
f30432d7 MS |
5083 | /* Complete the rtl for any static member objects of the type we're |
5084 | working on. */ | |
58010b57 | 5085 | for (x = TYPE_FIELDS (t); x; x = TREE_CHAIN (x)) |
19e7881c | 5086 | if (TREE_CODE (x) == VAR_DECL && TREE_STATIC (x) |
c7f4981a | 5087 | && same_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (x)), t)) |
19e7881c | 5088 | DECL_MODE (x) = TYPE_MODE (t); |
8d08fdba | 5089 | |
f90cdf34 | 5090 | /* Done with FIELDS...now decide whether to sort these for |
58010b57 | 5091 | faster lookups later. |
f90cdf34 | 5092 | |
6c73ad72 | 5093 | We use a small number because most searches fail (succeeding |
f90cdf34 MT |
5094 | ultimately as the search bores through the inheritance |
5095 | hierarchy), and we want this failure to occur quickly. */ | |
5096 | ||
58010b57 MM |
5097 | n_fields = count_fields (TYPE_FIELDS (t)); |
5098 | if (n_fields > 7) | |
f90cdf34 | 5099 | { |
d07605f5 AP |
5100 | struct sorted_fields_type *field_vec = ggc_alloc (sizeof (struct sorted_fields_type) |
5101 | + n_fields * sizeof (tree)); | |
5102 | field_vec->len = n_fields; | |
5103 | add_fields_to_record_type (TYPE_FIELDS (t), field_vec, 0); | |
5104 | qsort (field_vec->elts, n_fields, sizeof (tree), | |
17211ab5 | 5105 | field_decl_cmp); |
f90cdf34 MT |
5106 | if (! DECL_LANG_SPECIFIC (TYPE_MAIN_DECL (t))) |
5107 | retrofit_lang_decl (TYPE_MAIN_DECL (t)); | |
5108 | DECL_SORTED_FIELDS (TYPE_MAIN_DECL (t)) = field_vec; | |
5109 | } | |
5110 | ||
8d08fdba MS |
5111 | if (TYPE_HAS_CONSTRUCTOR (t)) |
5112 | { | |
5113 | tree vfields = CLASSTYPE_VFIELDS (t); | |
5114 | ||
dd98e14f NS |
5115 | for (vfields = CLASSTYPE_VFIELDS (t); |
5116 | vfields; vfields = TREE_CHAIN (vfields)) | |
5117 | /* Mark the fact that constructor for T could affect anybody | |
5118 | inheriting from T who wants to initialize vtables for | |
5119 | VFIELDS's type. */ | |
5120 | if (VF_BINFO_VALUE (vfields)) | |
5121 | TREE_ADDRESSABLE (vfields) = 1; | |
8d08fdba | 5122 | } |
8d08fdba | 5123 | |
8d7a5379 MM |
5124 | /* Make the rtl for any new vtables we have created, and unmark |
5125 | the base types we marked. */ | |
5126 | finish_vtbls (t); | |
9965d119 | 5127 | |
23656158 MM |
5128 | /* Build the VTT for T. */ |
5129 | build_vtt (t); | |
8d7a5379 | 5130 | |
0830ae44 NS |
5131 | if (warn_nonvdtor && TYPE_POLYMORPHIC_P (t) && TYPE_HAS_DESTRUCTOR (t) |
5132 | && DECL_VINDEX (TREE_VEC_ELT (CLASSTYPE_METHOD_VEC (t), 1)) == NULL_TREE) | |
33bd39a2 | 5133 | warning ("`%#T' has virtual functions but non-virtual destructor", t); |
8d08fdba | 5134 | |
0154eaa8 | 5135 | complete_vars (t); |
8d08fdba | 5136 | |
9e9ff709 MS |
5137 | if (warn_overloaded_virtual) |
5138 | warn_hidden (t); | |
8d08fdba | 5139 | |
ae673f14 | 5140 | maybe_suppress_debug_info (t); |
8d08fdba | 5141 | |
b7442fb5 NS |
5142 | dump_class_hierarchy (t); |
5143 | ||
d2e5ee5c | 5144 | /* Finish debugging output for this type. */ |
881c6935 | 5145 | rest_of_type_compilation (t, ! LOCAL_CLASS_P (t)); |
8d08fdba | 5146 | } |
f30432d7 | 5147 | |
61a127b3 MM |
5148 | /* When T was built up, the member declarations were added in reverse |
5149 | order. Rearrange them to declaration order. */ | |
5150 | ||
5151 | void | |
94edc4ab | 5152 | unreverse_member_declarations (tree t) |
61a127b3 MM |
5153 | { |
5154 | tree next; | |
5155 | tree prev; | |
5156 | tree x; | |
5157 | ||
7088fca9 KL |
5158 | /* The following lists are all in reverse order. Put them in |
5159 | declaration order now. */ | |
61a127b3 | 5160 | TYPE_METHODS (t) = nreverse (TYPE_METHODS (t)); |
7088fca9 | 5161 | CLASSTYPE_DECL_LIST (t) = nreverse (CLASSTYPE_DECL_LIST (t)); |
61a127b3 MM |
5162 | |
5163 | /* Actually, for the TYPE_FIELDS, only the non TYPE_DECLs are in | |
5164 | reverse order, so we can't just use nreverse. */ | |
5165 | prev = NULL_TREE; | |
5166 | for (x = TYPE_FIELDS (t); | |
5167 | x && TREE_CODE (x) != TYPE_DECL; | |
5168 | x = next) | |
5169 | { | |
5170 | next = TREE_CHAIN (x); | |
5171 | TREE_CHAIN (x) = prev; | |
5172 | prev = x; | |
5173 | } | |
5174 | if (prev) | |
5175 | { | |
5176 | TREE_CHAIN (TYPE_FIELDS (t)) = x; | |
5177 | if (prev) | |
5178 | TYPE_FIELDS (t) = prev; | |
5179 | } | |
5180 | } | |
5181 | ||
f30432d7 | 5182 | tree |
94edc4ab | 5183 | finish_struct (tree t, tree attributes) |
f30432d7 | 5184 | { |
82a98427 | 5185 | location_t saved_loc = input_location; |
1f0d71c5 | 5186 | |
61a127b3 MM |
5187 | /* Now that we've got all the field declarations, reverse everything |
5188 | as necessary. */ | |
5189 | unreverse_member_declarations (t); | |
f30432d7 | 5190 | |
91d231cb | 5191 | cplus_decl_attributes (&t, attributes, (int) ATTR_FLAG_TYPE_IN_PLACE); |
6467930b | 5192 | |
1f0d71c5 NS |
5193 | /* Nadger the current location so that diagnostics point to the start of |
5194 | the struct, not the end. */ | |
82a98427 | 5195 | input_location = DECL_SOURCE_LOCATION (TYPE_NAME (t)); |
1f0d71c5 | 5196 | |
5566b478 | 5197 | if (processing_template_decl) |
f30432d7 | 5198 | { |
b0e0b31f | 5199 | finish_struct_methods (t); |
867580ce | 5200 | TYPE_SIZE (t) = bitsize_zero_node; |
6f1b4c42 | 5201 | } |
f30432d7 | 5202 | else |
9f33663b | 5203 | finish_struct_1 (t); |
5566b478 | 5204 | |
82a98427 | 5205 | input_location = saved_loc; |
1f0d71c5 | 5206 | |
5566b478 | 5207 | TYPE_BEING_DEFINED (t) = 0; |
8f032717 | 5208 | |
5566b478 | 5209 | if (current_class_type) |
b74a0560 | 5210 | popclass (); |
5566b478 | 5211 | else |
357351e5 | 5212 | error ("trying to finish struct, but kicked out due to previous parse errors"); |
5566b478 | 5213 | |
5f261ba9 MM |
5214 | if (processing_template_decl && at_function_scope_p ()) |
5215 | add_stmt (build_min (TAG_DEFN, t)); | |
ae673f14 | 5216 | |
5566b478 | 5217 | return t; |
f30432d7 | 5218 | } |
8d08fdba | 5219 | \f |
51ddb82e | 5220 | /* Return the dynamic type of INSTANCE, if known. |
8d08fdba MS |
5221 | Used to determine whether the virtual function table is needed |
5222 | or not. | |
5223 | ||
5224 | *NONNULL is set iff INSTANCE can be known to be nonnull, regardless | |
97d953bb MM |
5225 | of our knowledge of its type. *NONNULL should be initialized |
5226 | before this function is called. */ | |
e92cc029 | 5227 | |
d8e178a0 | 5228 | static tree |
94edc4ab | 5229 | fixed_type_or_null (tree instance, int* nonnull, int* cdtorp) |
8d08fdba MS |
5230 | { |
5231 | switch (TREE_CODE (instance)) | |
5232 | { | |
5233 | case INDIRECT_REF: | |
608afcc5 | 5234 | if (POINTER_TYPE_P (TREE_TYPE (instance))) |
a0de9d20 JM |
5235 | return NULL_TREE; |
5236 | else | |
5237 | return fixed_type_or_null (TREE_OPERAND (instance, 0), | |
5238 | nonnull, cdtorp); | |
5239 | ||
8d08fdba MS |
5240 | case CALL_EXPR: |
5241 | /* This is a call to a constructor, hence it's never zero. */ | |
5242 | if (TREE_HAS_CONSTRUCTOR (instance)) | |
5243 | { | |
5244 | if (nonnull) | |
5245 | *nonnull = 1; | |
51ddb82e | 5246 | return TREE_TYPE (instance); |
8d08fdba | 5247 | } |
51ddb82e | 5248 | return NULL_TREE; |
8d08fdba MS |
5249 | |
5250 | case SAVE_EXPR: | |
5251 | /* This is a call to a constructor, hence it's never zero. */ | |
5252 | if (TREE_HAS_CONSTRUCTOR (instance)) | |
5253 | { | |
5254 | if (nonnull) | |
5255 | *nonnull = 1; | |
51ddb82e | 5256 | return TREE_TYPE (instance); |
8d08fdba | 5257 | } |
394fd776 | 5258 | return fixed_type_or_null (TREE_OPERAND (instance, 0), nonnull, cdtorp); |
8d08fdba MS |
5259 | |
5260 | case RTL_EXPR: | |
51ddb82e | 5261 | return NULL_TREE; |
8d08fdba MS |
5262 | |
5263 | case PLUS_EXPR: | |
5264 | case MINUS_EXPR: | |
394fd776 NS |
5265 | if (TREE_CODE (TREE_OPERAND (instance, 0)) == ADDR_EXPR) |
5266 | return fixed_type_or_null (TREE_OPERAND (instance, 0), nonnull, cdtorp); | |
8d08fdba MS |
5267 | if (TREE_CODE (TREE_OPERAND (instance, 1)) == INTEGER_CST) |
5268 | /* Propagate nonnull. */ | |
f63ab951 | 5269 | return fixed_type_or_null (TREE_OPERAND (instance, 0), nonnull, cdtorp); |
51ddb82e | 5270 | return NULL_TREE; |
8d08fdba MS |
5271 | |
5272 | case NOP_EXPR: | |
5273 | case CONVERT_EXPR: | |
394fd776 | 5274 | return fixed_type_or_null (TREE_OPERAND (instance, 0), nonnull, cdtorp); |
8d08fdba MS |
5275 | |
5276 | case ADDR_EXPR: | |
5277 | if (nonnull) | |
5278 | *nonnull = 1; | |
394fd776 | 5279 | return fixed_type_or_null (TREE_OPERAND (instance, 0), nonnull, cdtorp); |
8d08fdba MS |
5280 | |
5281 | case COMPONENT_REF: | |
394fd776 | 5282 | return fixed_type_or_null (TREE_OPERAND (instance, 1), nonnull, cdtorp); |
8d08fdba | 5283 | |
8d08fdba MS |
5284 | case VAR_DECL: |
5285 | case FIELD_DECL: | |
5286 | if (TREE_CODE (TREE_TYPE (instance)) == ARRAY_TYPE | |
5287 | && IS_AGGR_TYPE (TREE_TYPE (TREE_TYPE (instance)))) | |
5288 | { | |
5289 | if (nonnull) | |
5290 | *nonnull = 1; | |
51ddb82e | 5291 | return TREE_TYPE (TREE_TYPE (instance)); |
8d08fdba | 5292 | } |
e92cc029 | 5293 | /* fall through... */ |
8d08fdba MS |
5294 | case TARGET_EXPR: |
5295 | case PARM_DECL: | |
f63ab951 | 5296 | case RESULT_DECL: |
8d08fdba MS |
5297 | if (IS_AGGR_TYPE (TREE_TYPE (instance))) |
5298 | { | |
5299 | if (nonnull) | |
5300 | *nonnull = 1; | |
51ddb82e | 5301 | return TREE_TYPE (instance); |
8d08fdba | 5302 | } |
394fd776 NS |
5303 | else if (instance == current_class_ptr) |
5304 | { | |
5305 | if (nonnull) | |
5306 | *nonnull = 1; | |
5307 | ||
00a17e31 | 5308 | /* if we're in a ctor or dtor, we know our type. */ |
394fd776 NS |
5309 | if (DECL_LANG_SPECIFIC (current_function_decl) |
5310 | && (DECL_CONSTRUCTOR_P (current_function_decl) | |
5311 | || DECL_DESTRUCTOR_P (current_function_decl))) | |
5312 | { | |
5313 | if (cdtorp) | |
5314 | *cdtorp = 1; | |
5315 | return TREE_TYPE (TREE_TYPE (instance)); | |
5316 | } | |
5317 | } | |
5318 | else if (TREE_CODE (TREE_TYPE (instance)) == REFERENCE_TYPE) | |
5319 | { | |
5320 | /* Reference variables should be references to objects. */ | |
5321 | if (nonnull) | |
8d08fdba | 5322 | *nonnull = 1; |
772f8889 MM |
5323 | |
5324 | /* DECL_VAR_MARKED_P is used to prevent recursion; a | |
5325 | variable's initializer may refer to the variable | |
5326 | itself. */ | |
5327 | if (TREE_CODE (instance) == VAR_DECL | |
5328 | && DECL_INITIAL (instance) | |
5329 | && !DECL_VAR_MARKED_P (instance)) | |
5330 | { | |
5331 | tree type; | |
5332 | DECL_VAR_MARKED_P (instance) = 1; | |
5333 | type = fixed_type_or_null (DECL_INITIAL (instance), | |
5334 | nonnull, cdtorp); | |
5335 | DECL_VAR_MARKED_P (instance) = 0; | |
5336 | return type; | |
5337 | } | |
8d08fdba | 5338 | } |
51ddb82e | 5339 | return NULL_TREE; |
8d08fdba MS |
5340 | |
5341 | default: | |
51ddb82e | 5342 | return NULL_TREE; |
8d08fdba MS |
5343 | } |
5344 | } | |
51ddb82e | 5345 | |
838dfd8a | 5346 | /* Return nonzero if the dynamic type of INSTANCE is known, and |
338d90b8 NS |
5347 | equivalent to the static type. We also handle the case where |
5348 | INSTANCE is really a pointer. Return negative if this is a | |
5349 | ctor/dtor. There the dynamic type is known, but this might not be | |
5350 | the most derived base of the original object, and hence virtual | |
5351 | bases may not be layed out according to this type. | |
51ddb82e JM |
5352 | |
5353 | Used to determine whether the virtual function table is needed | |
5354 | or not. | |
5355 | ||
5356 | *NONNULL is set iff INSTANCE can be known to be nonnull, regardless | |
97d953bb MM |
5357 | of our knowledge of its type. *NONNULL should be initialized |
5358 | before this function is called. */ | |
51ddb82e JM |
5359 | |
5360 | int | |
94edc4ab | 5361 | resolves_to_fixed_type_p (tree instance, int* nonnull) |
51ddb82e JM |
5362 | { |
5363 | tree t = TREE_TYPE (instance); | |
394fd776 NS |
5364 | int cdtorp = 0; |
5365 | ||
5366 | tree fixed = fixed_type_or_null (instance, nonnull, &cdtorp); | |
51ddb82e JM |
5367 | if (fixed == NULL_TREE) |
5368 | return 0; | |
5369 | if (POINTER_TYPE_P (t)) | |
5370 | t = TREE_TYPE (t); | |
394fd776 NS |
5371 | if (!same_type_ignoring_top_level_qualifiers_p (t, fixed)) |
5372 | return 0; | |
5373 | return cdtorp ? -1 : 1; | |
51ddb82e JM |
5374 | } |
5375 | ||
8d08fdba MS |
5376 | \f |
5377 | void | |
94edc4ab | 5378 | init_class_processing (void) |
8d08fdba MS |
5379 | { |
5380 | current_class_depth = 0; | |
61a127b3 MM |
5381 | current_class_stack_size = 10; |
5382 | current_class_stack | |
c68b0a84 | 5383 | = xmalloc (current_class_stack_size * sizeof (struct class_stack_node)); |
1f6e1acc | 5384 | VARRAY_TREE_INIT (local_classes, 8, "local_classes"); |
8d08fdba | 5385 | |
0e5921e8 ZW |
5386 | ridpointers[(int) RID_PUBLIC] = access_public_node; |
5387 | ridpointers[(int) RID_PRIVATE] = access_private_node; | |
5388 | ridpointers[(int) RID_PROTECTED] = access_protected_node; | |
8d08fdba MS |
5389 | } |
5390 | ||
a723baf1 MM |
5391 | /* Set global variables CURRENT_CLASS_NAME and CURRENT_CLASS_TYPE as |
5392 | appropriate for TYPE. | |
8d08fdba | 5393 | |
8d08fdba MS |
5394 | So that we may avoid calls to lookup_name, we cache the _TYPE |
5395 | nodes of local TYPE_DECLs in the TREE_TYPE field of the name. | |
5396 | ||
5397 | For multiple inheritance, we perform a two-pass depth-first search | |
5398 | of the type lattice. The first pass performs a pre-order search, | |
5399 | marking types after the type has had its fields installed in | |
5400 | the appropriate IDENTIFIER_CLASS_VALUE slot. The second pass merely | |
5401 | unmarks the marked types. If a field or member function name | |
5402 | appears in an ambiguous way, the IDENTIFIER_CLASS_VALUE of | |
5403 | that name becomes `error_mark_node'. */ | |
5404 | ||
5405 | void | |
29370796 | 5406 | pushclass (tree type) |
8d08fdba | 5407 | { |
7fb4a8f7 | 5408 | type = TYPE_MAIN_VARIANT (type); |
8d08fdba | 5409 | |
61a127b3 MM |
5410 | /* Make sure there is enough room for the new entry on the stack. */ |
5411 | if (current_class_depth + 1 >= current_class_stack_size) | |
8d08fdba | 5412 | { |
61a127b3 MM |
5413 | current_class_stack_size *= 2; |
5414 | current_class_stack | |
c68b0a84 KG |
5415 | = xrealloc (current_class_stack, |
5416 | current_class_stack_size | |
5417 | * sizeof (struct class_stack_node)); | |
8d08fdba MS |
5418 | } |
5419 | ||
61a127b3 MM |
5420 | /* Insert a new entry on the class stack. */ |
5421 | current_class_stack[current_class_depth].name = current_class_name; | |
5422 | current_class_stack[current_class_depth].type = current_class_type; | |
5423 | current_class_stack[current_class_depth].access = current_access_specifier; | |
8f032717 | 5424 | current_class_stack[current_class_depth].names_used = 0; |
61a127b3 MM |
5425 | current_class_depth++; |
5426 | ||
5427 | /* Now set up the new type. */ | |
8d08fdba MS |
5428 | current_class_name = TYPE_NAME (type); |
5429 | if (TREE_CODE (current_class_name) == TYPE_DECL) | |
5430 | current_class_name = DECL_NAME (current_class_name); | |
5431 | current_class_type = type; | |
5432 | ||
61a127b3 MM |
5433 | /* By default, things in classes are private, while things in |
5434 | structures or unions are public. */ | |
5435 | current_access_specifier = (CLASSTYPE_DECLARED_CLASS (type) | |
5436 | ? access_private_node | |
5437 | : access_public_node); | |
5438 | ||
8d08fdba | 5439 | if (previous_class_type != NULL_TREE |
8f032717 | 5440 | && (type != previous_class_type |
d0f062fb | 5441 | || !COMPLETE_TYPE_P (previous_class_type)) |
8d08fdba MS |
5442 | && current_class_depth == 1) |
5443 | { | |
5444 | /* Forcibly remove any old class remnants. */ | |
8f032717 | 5445 | invalidate_class_lookup_cache (); |
8d08fdba MS |
5446 | } |
5447 | ||
8f032717 MM |
5448 | /* If we're about to enter a nested class, clear |
5449 | IDENTIFIER_CLASS_VALUE for the enclosing classes. */ | |
29370796 | 5450 | if (current_class_depth > 1) |
8f032717 MM |
5451 | clear_identifier_class_values (); |
5452 | ||
8d08fdba MS |
5453 | pushlevel_class (); |
5454 | ||
29370796 | 5455 | if (type != previous_class_type || current_class_depth > 1) |
fd9aef9d NS |
5456 | { |
5457 | push_class_decls (type); | |
5458 | if (CLASSTYPE_IS_TEMPLATE (type)) | |
5459 | { | |
5460 | /* If we are entering the scope of a template (not a | |
5461 | specialization), we need to push all the using decls with | |
5462 | dependent scope too. */ | |
5463 | tree fields; | |
5464 | ||
5465 | for (fields = TYPE_FIELDS (type); | |
5466 | fields; fields = TREE_CHAIN (fields)) | |
5467 | if (TREE_CODE (fields) == USING_DECL && !TREE_TYPE (fields)) | |
5468 | pushdecl_class_level (fields); | |
5469 | } | |
5470 | } | |
29370796 | 5471 | else |
8d08fdba | 5472 | { |
29370796 NS |
5473 | tree item; |
5474 | ||
5475 | /* We are re-entering the same class we just left, so we don't | |
5476 | have to search the whole inheritance matrix to find all the | |
5477 | decls to bind again. Instead, we install the cached | |
5478 | class_shadowed list, and walk through it binding names and | |
5479 | setting up IDENTIFIER_TYPE_VALUEs. */ | |
5480 | set_class_shadows (previous_class_values); | |
5481 | for (item = previous_class_values; item; item = TREE_CHAIN (item)) | |
8d08fdba | 5482 | { |
29370796 NS |
5483 | tree id = TREE_PURPOSE (item); |
5484 | tree decl = TREE_TYPE (item); | |
5485 | ||
5486 | push_class_binding (id, decl); | |
5487 | if (TREE_CODE (decl) == TYPE_DECL) | |
5488 | set_identifier_type_value (id, TREE_TYPE (decl)); | |
8d08fdba | 5489 | } |
29370796 | 5490 | unuse_fields (type); |
8f032717 | 5491 | } |
29370796 NS |
5492 | |
5493 | cxx_remember_type_decls (CLASSTYPE_NESTED_UTDS (type)); | |
8f032717 MM |
5494 | } |
5495 | ||
5496 | /* When we exit a toplevel class scope, we save the | |
5497 | IDENTIFIER_CLASS_VALUEs so that we can restore them quickly if we | |
5498 | reenter the class. Here, we've entered some other class, so we | |
5499 | must invalidate our cache. */ | |
8d08fdba | 5500 | |
8f032717 | 5501 | void |
94edc4ab | 5502 | invalidate_class_lookup_cache (void) |
8f032717 | 5503 | { |
8f032717 MM |
5504 | tree t; |
5505 | ||
4890c2f4 | 5506 | /* The IDENTIFIER_CLASS_VALUEs are no longer valid. */ |
8f032717 MM |
5507 | for (t = previous_class_values; t; t = TREE_CHAIN (t)) |
5508 | IDENTIFIER_CLASS_VALUE (TREE_PURPOSE (t)) = NULL_TREE; | |
4890c2f4 MM |
5509 | |
5510 | previous_class_values = NULL_TREE; | |
8f032717 | 5511 | previous_class_type = NULL_TREE; |
8d08fdba MS |
5512 | } |
5513 | ||
5514 | /* Get out of the current class scope. If we were in a class scope | |
b74a0560 | 5515 | previously, that is the one popped to. */ |
e92cc029 | 5516 | |
8d08fdba | 5517 | void |
94edc4ab | 5518 | popclass (void) |
8d08fdba | 5519 | { |
273a708f | 5520 | poplevel_class (); |
b74a0560 | 5521 | pop_class_decls (); |
8d08fdba MS |
5522 | |
5523 | current_class_depth--; | |
61a127b3 MM |
5524 | current_class_name = current_class_stack[current_class_depth].name; |
5525 | current_class_type = current_class_stack[current_class_depth].type; | |
5526 | current_access_specifier = current_class_stack[current_class_depth].access; | |
8f032717 MM |
5527 | if (current_class_stack[current_class_depth].names_used) |
5528 | splay_tree_delete (current_class_stack[current_class_depth].names_used); | |
8d08fdba MS |
5529 | } |
5530 | ||
70adf8a9 JM |
5531 | /* Returns 1 if current_class_type is either T or a nested type of T. |
5532 | We start looking from 1 because entry 0 is from global scope, and has | |
5533 | no type. */ | |
b9082e8a JM |
5534 | |
5535 | int | |
94edc4ab | 5536 | currently_open_class (tree t) |
b9082e8a JM |
5537 | { |
5538 | int i; | |
14d22dd6 | 5539 | if (current_class_type && same_type_p (t, current_class_type)) |
b9082e8a | 5540 | return 1; |
70adf8a9 | 5541 | for (i = 1; i < current_class_depth; ++i) |
14d22dd6 MM |
5542 | if (current_class_stack[i].type |
5543 | && same_type_p (current_class_stack [i].type, t)) | |
b9082e8a JM |
5544 | return 1; |
5545 | return 0; | |
5546 | } | |
5547 | ||
70adf8a9 JM |
5548 | /* If either current_class_type or one of its enclosing classes are derived |
5549 | from T, return the appropriate type. Used to determine how we found | |
5550 | something via unqualified lookup. */ | |
5551 | ||
5552 | tree | |
94edc4ab | 5553 | currently_open_derived_class (tree t) |
70adf8a9 JM |
5554 | { |
5555 | int i; | |
5556 | ||
9bcb9aae | 5557 | /* The bases of a dependent type are unknown. */ |
1fb3244a MM |
5558 | if (dependent_type_p (t)) |
5559 | return NULL_TREE; | |
5560 | ||
70adf8a9 JM |
5561 | if (DERIVED_FROM_P (t, current_class_type)) |
5562 | return current_class_type; | |
5563 | ||
5564 | for (i = current_class_depth - 1; i > 0; --i) | |
5565 | if (DERIVED_FROM_P (t, current_class_stack[i].type)) | |
5566 | return current_class_stack[i].type; | |
5567 | ||
5568 | return NULL_TREE; | |
5569 | } | |
5570 | ||
8d08fdba | 5571 | /* When entering a class scope, all enclosing class scopes' names with |
14d22dd6 MM |
5572 | static meaning (static variables, static functions, types and |
5573 | enumerators) have to be visible. This recursive function calls | |
5574 | pushclass for all enclosing class contexts until global or a local | |
5575 | scope is reached. TYPE is the enclosed class. */ | |
8d08fdba MS |
5576 | |
5577 | void | |
14d22dd6 | 5578 | push_nested_class (tree type) |
8d08fdba | 5579 | { |
a28e3c7f MS |
5580 | tree context; |
5581 | ||
b262d64c | 5582 | /* A namespace might be passed in error cases, like A::B:C. */ |
07c88314 MM |
5583 | if (type == NULL_TREE |
5584 | || type == error_mark_node | |
b262d64c | 5585 | || TREE_CODE (type) == NAMESPACE_DECL |
07c88314 | 5586 | || ! IS_AGGR_TYPE (type) |
73b0fce8 | 5587 | || TREE_CODE (type) == TEMPLATE_TYPE_PARM |
a1281f45 | 5588 | || TREE_CODE (type) == BOUND_TEMPLATE_TEMPLATE_PARM) |
a28e3c7f MS |
5589 | return; |
5590 | ||
d2e5ee5c | 5591 | context = DECL_CONTEXT (TYPE_MAIN_DECL (type)); |
8d08fdba | 5592 | |
6b400b21 | 5593 | if (context && CLASS_TYPE_P (context)) |
14d22dd6 | 5594 | push_nested_class (context); |
29370796 | 5595 | pushclass (type); |
8d08fdba MS |
5596 | } |
5597 | ||
a723baf1 | 5598 | /* Undoes a push_nested_class call. */ |
8d08fdba MS |
5599 | |
5600 | void | |
94edc4ab | 5601 | pop_nested_class (void) |
8d08fdba | 5602 | { |
d2e5ee5c | 5603 | tree context = DECL_CONTEXT (TYPE_MAIN_DECL (current_class_type)); |
8d08fdba | 5604 | |
b74a0560 | 5605 | popclass (); |
6b400b21 | 5606 | if (context && CLASS_TYPE_P (context)) |
b74a0560 | 5607 | pop_nested_class (); |
8d08fdba MS |
5608 | } |
5609 | ||
46ccf50a JM |
5610 | /* Returns the number of extern "LANG" blocks we are nested within. */ |
5611 | ||
5612 | int | |
94edc4ab | 5613 | current_lang_depth (void) |
46ccf50a JM |
5614 | { |
5615 | return VARRAY_ACTIVE_SIZE (current_lang_base); | |
5616 | } | |
5617 | ||
8d08fdba MS |
5618 | /* Set global variables CURRENT_LANG_NAME to appropriate value |
5619 | so that behavior of name-mangling machinery is correct. */ | |
5620 | ||
5621 | void | |
94edc4ab | 5622 | push_lang_context (tree name) |
8d08fdba | 5623 | { |
46ccf50a | 5624 | VARRAY_PUSH_TREE (current_lang_base, current_lang_name); |
8d08fdba | 5625 | |
e229f2cd | 5626 | if (name == lang_name_cplusplus) |
8d08fdba | 5627 | { |
8d08fdba MS |
5628 | current_lang_name = name; |
5629 | } | |
e229f2cd PB |
5630 | else if (name == lang_name_java) |
5631 | { | |
e229f2cd PB |
5632 | current_lang_name = name; |
5633 | /* DECL_IGNORED_P is initially set for these types, to avoid clutter. | |
5634 | (See record_builtin_java_type in decl.c.) However, that causes | |
5635 | incorrect debug entries if these types are actually used. | |
00a17e31 | 5636 | So we re-enable debug output after extern "Java". */ |
e3cd9945 APB |
5637 | DECL_IGNORED_P (TYPE_NAME (java_byte_type_node)) = 0; |
5638 | DECL_IGNORED_P (TYPE_NAME (java_short_type_node)) = 0; | |
5639 | DECL_IGNORED_P (TYPE_NAME (java_int_type_node)) = 0; | |
5640 | DECL_IGNORED_P (TYPE_NAME (java_long_type_node)) = 0; | |
5641 | DECL_IGNORED_P (TYPE_NAME (java_float_type_node)) = 0; | |
5642 | DECL_IGNORED_P (TYPE_NAME (java_double_type_node)) = 0; | |
5643 | DECL_IGNORED_P (TYPE_NAME (java_char_type_node)) = 0; | |
5644 | DECL_IGNORED_P (TYPE_NAME (java_boolean_type_node)) = 0; | |
e229f2cd | 5645 | } |
8d08fdba MS |
5646 | else if (name == lang_name_c) |
5647 | { | |
8d08fdba MS |
5648 | current_lang_name = name; |
5649 | } | |
5650 | else | |
8251199e | 5651 | error ("language string `\"%s\"' not recognized", IDENTIFIER_POINTER (name)); |
8d08fdba MS |
5652 | } |
5653 | ||
5654 | /* Get out of the current language scope. */ | |
e92cc029 | 5655 | |
8d08fdba | 5656 | void |
94edc4ab | 5657 | pop_lang_context (void) |
8d08fdba | 5658 | { |
46ccf50a JM |
5659 | current_lang_name = VARRAY_TOP_TREE (current_lang_base); |
5660 | VARRAY_POP (current_lang_base); | |
8d08fdba | 5661 | } |
8d08fdba MS |
5662 | \f |
5663 | /* Type instantiation routines. */ | |
5664 | ||
104bf76a MM |
5665 | /* Given an OVERLOAD and a TARGET_TYPE, return the function that |
5666 | matches the TARGET_TYPE. If there is no satisfactory match, return | |
5667 | error_mark_node, and issue an error message if COMPLAIN is | |
838dfd8a | 5668 | nonzero. Permit pointers to member function if PTRMEM is nonzero. |
19420d00 | 5669 | If TEMPLATE_ONLY, the name of the overloaded function |
104bf76a MM |
5670 | was a template-id, and EXPLICIT_TARGS are the explicitly provided |
5671 | template arguments. */ | |
5672 | ||
2c73f9f5 | 5673 | static tree |
94edc4ab NN |
5674 | resolve_address_of_overloaded_function (tree target_type, |
5675 | tree overload, | |
5676 | int complain, | |
5677 | int ptrmem, | |
5678 | int template_only, | |
5679 | tree explicit_targs) | |
2c73f9f5 | 5680 | { |
104bf76a MM |
5681 | /* Here's what the standard says: |
5682 | ||
5683 | [over.over] | |
5684 | ||
5685 | If the name is a function template, template argument deduction | |
5686 | is done, and if the argument deduction succeeds, the deduced | |
5687 | arguments are used to generate a single template function, which | |
5688 | is added to the set of overloaded functions considered. | |
5689 | ||
5690 | Non-member functions and static member functions match targets of | |
5691 | type "pointer-to-function" or "reference-to-function." Nonstatic | |
5692 | member functions match targets of type "pointer-to-member | |
5693 | function;" the function type of the pointer to member is used to | |
5694 | select the member function from the set of overloaded member | |
5695 | functions. If a nonstatic member function is selected, the | |
5696 | reference to the overloaded function name is required to have the | |
5697 | form of a pointer to member as described in 5.3.1. | |
5698 | ||
5699 | If more than one function is selected, any template functions in | |
5700 | the set are eliminated if the set also contains a non-template | |
5701 | function, and any given template function is eliminated if the | |
5702 | set contains a second template function that is more specialized | |
5703 | than the first according to the partial ordering rules 14.5.5.2. | |
5704 | After such eliminations, if any, there shall remain exactly one | |
5705 | selected function. */ | |
5706 | ||
5707 | int is_ptrmem = 0; | |
5708 | int is_reference = 0; | |
5709 | /* We store the matches in a TREE_LIST rooted here. The functions | |
5710 | are the TREE_PURPOSE, not the TREE_VALUE, in this list, for easy | |
5711 | interoperability with most_specialized_instantiation. */ | |
5712 | tree matches = NULL_TREE; | |
50714e79 | 5713 | tree fn; |
104bf76a | 5714 | |
d8f8dca1 MM |
5715 | /* By the time we get here, we should be seeing only real |
5716 | pointer-to-member types, not the internal POINTER_TYPE to | |
5717 | METHOD_TYPE representation. */ | |
5718 | my_friendly_assert (!(TREE_CODE (target_type) == POINTER_TYPE | |
5719 | && (TREE_CODE (TREE_TYPE (target_type)) | |
5720 | == METHOD_TYPE)), 0); | |
104bf76a | 5721 | |
2bdb0643 JM |
5722 | if (TREE_CODE (overload) == COMPONENT_REF) |
5723 | overload = TREE_OPERAND (overload, 1); | |
5724 | ||
104bf76a MM |
5725 | /* Check that the TARGET_TYPE is reasonable. */ |
5726 | if (TYPE_PTRFN_P (target_type)) | |
381ddaa6 | 5727 | /* This is OK. */; |
104bf76a MM |
5728 | else if (TYPE_PTRMEMFUNC_P (target_type)) |
5729 | /* This is OK, too. */ | |
5730 | is_ptrmem = 1; | |
5731 | else if (TREE_CODE (target_type) == FUNCTION_TYPE) | |
5732 | { | |
5733 | /* This is OK, too. This comes from a conversion to reference | |
5734 | type. */ | |
5735 | target_type = build_reference_type (target_type); | |
5736 | is_reference = 1; | |
5737 | } | |
5738 | else | |
5739 | { | |
5740 | if (complain) | |
33bd39a2 | 5741 | error ("\ |
381ddaa6 JM |
5742 | cannot resolve overloaded function `%D' based on conversion to type `%T'", |
5743 | DECL_NAME (OVL_FUNCTION (overload)), target_type); | |
104bf76a MM |
5744 | return error_mark_node; |
5745 | } | |
5746 | ||
5747 | /* If we can find a non-template function that matches, we can just | |
5748 | use it. There's no point in generating template instantiations | |
5749 | if we're just going to throw them out anyhow. But, of course, we | |
5750 | can only do this when we don't *need* a template function. */ | |
5751 | if (!template_only) | |
5752 | { | |
5753 | tree fns; | |
5754 | ||
a723baf1 | 5755 | for (fns = overload; fns; fns = OVL_NEXT (fns)) |
104bf76a | 5756 | { |
a723baf1 | 5757 | tree fn = OVL_CURRENT (fns); |
104bf76a | 5758 | tree fntype; |
2c73f9f5 | 5759 | |
104bf76a MM |
5760 | if (TREE_CODE (fn) == TEMPLATE_DECL) |
5761 | /* We're not looking for templates just yet. */ | |
5762 | continue; | |
5763 | ||
5764 | if ((TREE_CODE (TREE_TYPE (fn)) == METHOD_TYPE) | |
5765 | != is_ptrmem) | |
5766 | /* We're looking for a non-static member, and this isn't | |
5767 | one, or vice versa. */ | |
5768 | continue; | |
5769 | ||
5770 | /* See if there's a match. */ | |
5771 | fntype = TREE_TYPE (fn); | |
5772 | if (is_ptrmem) | |
5773 | fntype = build_ptrmemfunc_type (build_pointer_type (fntype)); | |
5774 | else if (!is_reference) | |
5775 | fntype = build_pointer_type (fntype); | |
5776 | ||
5777 | if (can_convert_arg (target_type, fntype, fn)) | |
e1b3e07d | 5778 | matches = tree_cons (fn, NULL_TREE, matches); |
104bf76a MM |
5779 | } |
5780 | } | |
5781 | ||
5782 | /* Now, if we've already got a match (or matches), there's no need | |
5783 | to proceed to the template functions. But, if we don't have a | |
5784 | match we need to look at them, too. */ | |
5785 | if (!matches) | |
2c73f9f5 | 5786 | { |
104bf76a MM |
5787 | tree target_fn_type; |
5788 | tree target_arg_types; | |
8d3631f8 | 5789 | tree target_ret_type; |
104bf76a MM |
5790 | tree fns; |
5791 | ||
5792 | if (is_ptrmem) | |
4393e105 MM |
5793 | target_fn_type |
5794 | = TREE_TYPE (TYPE_PTRMEMFUNC_FN_TYPE (target_type)); | |
2c73f9f5 | 5795 | else |
4393e105 MM |
5796 | target_fn_type = TREE_TYPE (target_type); |
5797 | target_arg_types = TYPE_ARG_TYPES (target_fn_type); | |
8d3631f8 | 5798 | target_ret_type = TREE_TYPE (target_fn_type); |
e5214479 JM |
5799 | |
5800 | /* Never do unification on the 'this' parameter. */ | |
5801 | if (TREE_CODE (target_fn_type) == METHOD_TYPE) | |
5802 | target_arg_types = TREE_CHAIN (target_arg_types); | |
4393e105 | 5803 | |
a723baf1 | 5804 | for (fns = overload; fns; fns = OVL_NEXT (fns)) |
104bf76a | 5805 | { |
a723baf1 | 5806 | tree fn = OVL_CURRENT (fns); |
104bf76a MM |
5807 | tree instantiation; |
5808 | tree instantiation_type; | |
5809 | tree targs; | |
5810 | ||
5811 | if (TREE_CODE (fn) != TEMPLATE_DECL) | |
5812 | /* We're only looking for templates. */ | |
5813 | continue; | |
5814 | ||
5815 | if ((TREE_CODE (TREE_TYPE (fn)) == METHOD_TYPE) | |
5816 | != is_ptrmem) | |
4393e105 | 5817 | /* We're not looking for a non-static member, and this is |
104bf76a MM |
5818 | one, or vice versa. */ |
5819 | continue; | |
5820 | ||
104bf76a | 5821 | /* Try to do argument deduction. */ |
f31c0a32 | 5822 | targs = make_tree_vec (DECL_NTPARMS (fn)); |
4393e105 | 5823 | if (fn_type_unification (fn, explicit_targs, targs, |
8d3631f8 | 5824 | target_arg_types, target_ret_type, |
e5214479 | 5825 | DEDUCE_EXACT, -1) != 0) |
104bf76a MM |
5826 | /* Argument deduction failed. */ |
5827 | continue; | |
5828 | ||
5829 | /* Instantiate the template. */ | |
3e4a3562 NS |
5830 | instantiation = instantiate_template (fn, targs, |
5831 | complain ? tf_error : tf_none); | |
104bf76a MM |
5832 | if (instantiation == error_mark_node) |
5833 | /* Instantiation failed. */ | |
5834 | continue; | |
5835 | ||
5836 | /* See if there's a match. */ | |
5837 | instantiation_type = TREE_TYPE (instantiation); | |
5838 | if (is_ptrmem) | |
5839 | instantiation_type = | |
5840 | build_ptrmemfunc_type (build_pointer_type (instantiation_type)); | |
5841 | else if (!is_reference) | |
5842 | instantiation_type = build_pointer_type (instantiation_type); | |
5843 | if (can_convert_arg (target_type, instantiation_type, instantiation)) | |
e1b3e07d | 5844 | matches = tree_cons (instantiation, fn, matches); |
104bf76a MM |
5845 | } |
5846 | ||
5847 | /* Now, remove all but the most specialized of the matches. */ | |
5848 | if (matches) | |
5849 | { | |
e5214479 | 5850 | tree match = most_specialized_instantiation (matches); |
104bf76a MM |
5851 | |
5852 | if (match != error_mark_node) | |
e1b3e07d | 5853 | matches = tree_cons (match, NULL_TREE, NULL_TREE); |
104bf76a MM |
5854 | } |
5855 | } | |
5856 | ||
5857 | /* Now we should have exactly one function in MATCHES. */ | |
5858 | if (matches == NULL_TREE) | |
5859 | { | |
5860 | /* There were *no* matches. */ | |
5861 | if (complain) | |
5862 | { | |
33bd39a2 | 5863 | error ("no matches converting function `%D' to type `%#T'", |
104bf76a MM |
5864 | DECL_NAME (OVL_FUNCTION (overload)), |
5865 | target_type); | |
6b9b6b15 JM |
5866 | |
5867 | /* print_candidates expects a chain with the functions in | |
5868 | TREE_VALUE slots, so we cons one up here (we're losing anyway, | |
5869 | so why be clever?). */ | |
5870 | for (; overload; overload = OVL_NEXT (overload)) | |
e1b3e07d MM |
5871 | matches = tree_cons (NULL_TREE, OVL_CURRENT (overload), |
5872 | matches); | |
6b9b6b15 JM |
5873 | |
5874 | print_candidates (matches); | |
104bf76a MM |
5875 | } |
5876 | return error_mark_node; | |
2c73f9f5 | 5877 | } |
104bf76a MM |
5878 | else if (TREE_CHAIN (matches)) |
5879 | { | |
5880 | /* There were too many matches. */ | |
5881 | ||
5882 | if (complain) | |
5883 | { | |
5884 | tree match; | |
5885 | ||
33bd39a2 | 5886 | error ("converting overloaded function `%D' to type `%#T' is ambiguous", |
104bf76a MM |
5887 | DECL_NAME (OVL_FUNCTION (overload)), |
5888 | target_type); | |
5889 | ||
5890 | /* Since print_candidates expects the functions in the | |
5891 | TREE_VALUE slot, we flip them here. */ | |
5892 | for (match = matches; match; match = TREE_CHAIN (match)) | |
5893 | TREE_VALUE (match) = TREE_PURPOSE (match); | |
5894 | ||
5895 | print_candidates (matches); | |
5896 | } | |
5897 | ||
5898 | return error_mark_node; | |
5899 | } | |
5900 | ||
50714e79 MM |
5901 | /* Good, exactly one match. Now, convert it to the correct type. */ |
5902 | fn = TREE_PURPOSE (matches); | |
5903 | ||
b1ce3eb2 | 5904 | if (DECL_NONSTATIC_MEMBER_FUNCTION_P (fn) |
19420d00 NS |
5905 | && !ptrmem && !flag_ms_extensions) |
5906 | { | |
b1ce3eb2 NS |
5907 | static int explained; |
5908 | ||
19420d00 NS |
5909 | if (!complain) |
5910 | return error_mark_node; | |
5911 | ||
33bd39a2 | 5912 | pedwarn ("assuming pointer to member `%D'", fn); |
b1ce3eb2 NS |
5913 | if (!explained) |
5914 | { | |
33bd39a2 | 5915 | pedwarn ("(a pointer to member can only be formed with `&%E')", fn); |
b1ce3eb2 NS |
5916 | explained = 1; |
5917 | } | |
19420d00 | 5918 | } |
a6ecf8b6 JM |
5919 | mark_used (fn); |
5920 | ||
50714e79 MM |
5921 | if (TYPE_PTRFN_P (target_type) || TYPE_PTRMEMFUNC_P (target_type)) |
5922 | return build_unary_op (ADDR_EXPR, fn, 0); | |
5923 | else | |
5924 | { | |
5925 | /* The target must be a REFERENCE_TYPE. Above, build_unary_op | |
5926 | will mark the function as addressed, but here we must do it | |
5927 | explicitly. */ | |
dffd7eb6 | 5928 | cxx_mark_addressable (fn); |
50714e79 MM |
5929 | |
5930 | return fn; | |
5931 | } | |
2c73f9f5 ML |
5932 | } |
5933 | ||
ec255269 MS |
5934 | /* This function will instantiate the type of the expression given in |
5935 | RHS to match the type of LHSTYPE. If errors exist, then return | |
5e76004e NS |
5936 | error_mark_node. FLAGS is a bit mask. If ITF_COMPLAIN is set, then |
5937 | we complain on errors. If we are not complaining, never modify rhs, | |
5938 | as overload resolution wants to try many possible instantiations, in | |
5939 | the hope that at least one will work. | |
5940 | ||
e6e174e5 JM |
5941 | For non-recursive calls, LHSTYPE should be a function, pointer to |
5942 | function, or a pointer to member function. */ | |
e92cc029 | 5943 | |
8d08fdba | 5944 | tree |
94edc4ab | 5945 | instantiate_type (tree lhstype, tree rhs, tsubst_flags_t flags) |
8d08fdba | 5946 | { |
c2ea3a40 | 5947 | int complain = (flags & tf_error); |
c2ea3a40 | 5948 | int allow_ptrmem = flags & tf_ptrmem_ok; |
19420d00 | 5949 | |
c2ea3a40 | 5950 | flags &= ~tf_ptrmem_ok; |
105d8e1f | 5951 | |
8d08fdba MS |
5952 | if (TREE_CODE (lhstype) == UNKNOWN_TYPE) |
5953 | { | |
5954 | if (complain) | |
8251199e | 5955 | error ("not enough type information"); |
8d08fdba MS |
5956 | return error_mark_node; |
5957 | } | |
5958 | ||
5959 | if (TREE_TYPE (rhs) != NULL_TREE && ! (type_unknown_p (rhs))) | |
abff8e06 | 5960 | { |
8f4b394d | 5961 | if (same_type_p (lhstype, TREE_TYPE (rhs))) |
abff8e06 | 5962 | return rhs; |
a723baf1 MM |
5963 | if (flag_ms_extensions |
5964 | && TYPE_PTRMEMFUNC_P (lhstype) | |
5965 | && !TYPE_PTRMEMFUNC_P (TREE_TYPE (rhs))) | |
5966 | /* Microsoft allows `A::f' to be resolved to a | |
5967 | pointer-to-member. */ | |
5968 | ; | |
5969 | else | |
5970 | { | |
5971 | if (complain) | |
5972 | error ("argument of type `%T' does not match `%T'", | |
5973 | TREE_TYPE (rhs), lhstype); | |
5974 | return error_mark_node; | |
5975 | } | |
abff8e06 | 5976 | } |
8d08fdba | 5977 | |
50ad9642 MM |
5978 | if (TREE_CODE (rhs) == BASELINK) |
5979 | rhs = BASELINK_FUNCTIONS (rhs); | |
5980 | ||
2c73f9f5 ML |
5981 | /* We don't overwrite rhs if it is an overloaded function. |
5982 | Copying it would destroy the tree link. */ | |
5983 | if (TREE_CODE (rhs) != OVERLOAD) | |
5984 | rhs = copy_node (rhs); | |
c73964b2 | 5985 | |
8d08fdba MS |
5986 | /* This should really only be used when attempting to distinguish |
5987 | what sort of a pointer to function we have. For now, any | |
5988 | arithmetic operation which is not supported on pointers | |
5989 | is rejected as an error. */ | |
5990 | ||
5991 | switch (TREE_CODE (rhs)) | |
5992 | { | |
5993 | case TYPE_EXPR: | |
5994 | case CONVERT_EXPR: | |
5995 | case SAVE_EXPR: | |
5996 | case CONSTRUCTOR: | |
5997 | case BUFFER_REF: | |
a98facb0 | 5998 | abort (); |
8d08fdba MS |
5999 | return error_mark_node; |
6000 | ||
6001 | case INDIRECT_REF: | |
6002 | case ARRAY_REF: | |
ec255269 MS |
6003 | { |
6004 | tree new_rhs; | |
8d08fdba | 6005 | |
ec255269 | 6006 | new_rhs = instantiate_type (build_pointer_type (lhstype), |
940ff223 | 6007 | TREE_OPERAND (rhs, 0), flags); |
ec255269 MS |
6008 | if (new_rhs == error_mark_node) |
6009 | return error_mark_node; | |
6010 | ||
6011 | TREE_TYPE (rhs) = lhstype; | |
6012 | TREE_OPERAND (rhs, 0) = new_rhs; | |
6013 | return rhs; | |
6014 | } | |
8d08fdba MS |
6015 | |
6016 | case NOP_EXPR: | |
6017 | rhs = copy_node (TREE_OPERAND (rhs, 0)); | |
6018 | TREE_TYPE (rhs) = unknown_type_node; | |
940ff223 | 6019 | return instantiate_type (lhstype, rhs, flags); |
8d08fdba MS |
6020 | |
6021 | case COMPONENT_REF: | |
19420d00 | 6022 | return instantiate_type (lhstype, TREE_OPERAND (rhs, 1), flags); |
8d08fdba | 6023 | |
2a238a97 | 6024 | case OFFSET_REF: |
05e0b2f4 JM |
6025 | rhs = TREE_OPERAND (rhs, 1); |
6026 | if (BASELINK_P (rhs)) | |
da15dae6 | 6027 | return instantiate_type (lhstype, BASELINK_FUNCTIONS (rhs), |
19420d00 | 6028 | flags | allow_ptrmem); |
05e0b2f4 | 6029 | |
2a238a97 MM |
6030 | /* This can happen if we are forming a pointer-to-member for a |
6031 | member template. */ | |
2a238a97 | 6032 | my_friendly_assert (TREE_CODE (rhs) == TEMPLATE_ID_EXPR, 0); |
05e0b2f4 | 6033 | |
2a238a97 | 6034 | /* Fall through. */ |
874503bc | 6035 | |
386b8a85 | 6036 | case TEMPLATE_ID_EXPR: |
2bdb0643 JM |
6037 | { |
6038 | tree fns = TREE_OPERAND (rhs, 0); | |
6039 | tree args = TREE_OPERAND (rhs, 1); | |
6040 | ||
19420d00 | 6041 | return |
2bdb0643 JM |
6042 | resolve_address_of_overloaded_function (lhstype, |
6043 | fns, | |
6044 | complain, | |
19420d00 | 6045 | allow_ptrmem, |
2bdb0643 JM |
6046 | /*template_only=*/1, |
6047 | args); | |
2bdb0643 | 6048 | } |
386b8a85 | 6049 | |
2c73f9f5 | 6050 | case OVERLOAD: |
a723baf1 | 6051 | case FUNCTION_DECL: |
104bf76a MM |
6052 | return |
6053 | resolve_address_of_overloaded_function (lhstype, | |
6054 | rhs, | |
6055 | complain, | |
19420d00 | 6056 | allow_ptrmem, |
104bf76a MM |
6057 | /*template_only=*/0, |
6058 | /*explicit_targs=*/NULL_TREE); | |
2c73f9f5 ML |
6059 | |
6060 | case TREE_LIST: | |
00a17e31 | 6061 | /* Now we should have a baselink. */ |
940ff223 | 6062 | my_friendly_assert (BASELINK_P (rhs), 990412); |
e5966228 | 6063 | |
da15dae6 | 6064 | return instantiate_type (lhstype, BASELINK_FUNCTIONS (rhs), flags); |
8d08fdba MS |
6065 | |
6066 | case CALL_EXPR: | |
6067 | /* This is too hard for now. */ | |
a98facb0 | 6068 | abort (); |
8d08fdba MS |
6069 | return error_mark_node; |
6070 | ||
6071 | case PLUS_EXPR: | |
6072 | case MINUS_EXPR: | |
6073 | case COMPOUND_EXPR: | |
a0a33927 | 6074 | TREE_OPERAND (rhs, 0) |
940ff223 | 6075 | = instantiate_type (lhstype, TREE_OPERAND (rhs, 0), flags); |
8d08fdba MS |
6076 | if (TREE_OPERAND (rhs, 0) == error_mark_node) |
6077 | return error_mark_node; | |
a0a33927 | 6078 | TREE_OPERAND (rhs, 1) |
940ff223 | 6079 | = instantiate_type (lhstype, TREE_OPERAND (rhs, 1), flags); |
8d08fdba MS |
6080 | if (TREE_OPERAND (rhs, 1) == error_mark_node) |
6081 | return error_mark_node; | |
6082 | ||
6083 | TREE_TYPE (rhs) = lhstype; | |
6084 | return rhs; | |
6085 | ||
6086 | case MULT_EXPR: | |
6087 | case TRUNC_DIV_EXPR: | |
6088 | case FLOOR_DIV_EXPR: | |
6089 | case CEIL_DIV_EXPR: | |
6090 | case ROUND_DIV_EXPR: | |
6091 | case RDIV_EXPR: | |
6092 | case TRUNC_MOD_EXPR: | |
6093 | case FLOOR_MOD_EXPR: | |
6094 | case CEIL_MOD_EXPR: | |
6095 | case ROUND_MOD_EXPR: | |
6096 | case FIX_ROUND_EXPR: | |
6097 | case FIX_FLOOR_EXPR: | |
6098 | case FIX_CEIL_EXPR: | |
6099 | case FIX_TRUNC_EXPR: | |
6100 | case FLOAT_EXPR: | |
6101 | case NEGATE_EXPR: | |
6102 | case ABS_EXPR: | |
6103 | case MAX_EXPR: | |
6104 | case MIN_EXPR: | |
6105 | case FFS_EXPR: | |
6106 | ||
6107 | case BIT_AND_EXPR: | |
6108 | case BIT_IOR_EXPR: | |
6109 | case BIT_XOR_EXPR: | |
6110 | case LSHIFT_EXPR: | |
6111 | case RSHIFT_EXPR: | |
6112 | case LROTATE_EXPR: | |
6113 | case RROTATE_EXPR: | |
6114 | ||
6115 | case PREINCREMENT_EXPR: | |
6116 | case PREDECREMENT_EXPR: | |
6117 | case POSTINCREMENT_EXPR: | |
6118 | case POSTDECREMENT_EXPR: | |
6119 | if (complain) | |
8251199e | 6120 | error ("invalid operation on uninstantiated type"); |
8d08fdba MS |
6121 | return error_mark_node; |
6122 | ||
6123 | case TRUTH_AND_EXPR: | |
6124 | case TRUTH_OR_EXPR: | |
6125 | case TRUTH_XOR_EXPR: | |
6126 | case LT_EXPR: | |
6127 | case LE_EXPR: | |
6128 | case GT_EXPR: | |
6129 | case GE_EXPR: | |
6130 | case EQ_EXPR: | |
6131 | case NE_EXPR: | |
6132 | case TRUTH_ANDIF_EXPR: | |
6133 | case TRUTH_ORIF_EXPR: | |
6134 | case TRUTH_NOT_EXPR: | |
6135 | if (complain) | |
8251199e | 6136 | error ("not enough type information"); |
8d08fdba MS |
6137 | return error_mark_node; |
6138 | ||
ca36f057 MM |
6139 | case COND_EXPR: |
6140 | if (type_unknown_p (TREE_OPERAND (rhs, 0))) | |
6141 | { | |
6142 | if (complain) | |
6143 | error ("not enough type information"); | |
6144 | return error_mark_node; | |
6145 | } | |
6146 | TREE_OPERAND (rhs, 1) | |
6147 | = instantiate_type (lhstype, TREE_OPERAND (rhs, 1), flags); | |
6148 | if (TREE_OPERAND (rhs, 1) == error_mark_node) | |
6149 | return error_mark_node; | |
6150 | TREE_OPERAND (rhs, 2) | |
6151 | = instantiate_type (lhstype, TREE_OPERAND (rhs, 2), flags); | |
6152 | if (TREE_OPERAND (rhs, 2) == error_mark_node) | |
6153 | return error_mark_node; | |
6154 | ||
6155 | TREE_TYPE (rhs) = lhstype; | |
6156 | return rhs; | |
6157 | ||
6158 | case MODIFY_EXPR: | |
6159 | TREE_OPERAND (rhs, 1) | |
6160 | = instantiate_type (lhstype, TREE_OPERAND (rhs, 1), flags); | |
6161 | if (TREE_OPERAND (rhs, 1) == error_mark_node) | |
6162 | return error_mark_node; | |
6163 | ||
6164 | TREE_TYPE (rhs) = lhstype; | |
6165 | return rhs; | |
6166 | ||
6167 | case ADDR_EXPR: | |
19420d00 NS |
6168 | { |
6169 | if (PTRMEM_OK_P (rhs)) | |
c2ea3a40 | 6170 | flags |= tf_ptrmem_ok; |
19420d00 | 6171 | |
ca36f057 | 6172 | return instantiate_type (lhstype, TREE_OPERAND (rhs, 0), flags); |
19420d00 | 6173 | } |
ca36f057 | 6174 | case ENTRY_VALUE_EXPR: |
a98facb0 | 6175 | abort (); |
ca36f057 MM |
6176 | return error_mark_node; |
6177 | ||
6178 | case ERROR_MARK: | |
6179 | return error_mark_node; | |
6180 | ||
6181 | default: | |
a98facb0 | 6182 | abort (); |
ca36f057 MM |
6183 | return error_mark_node; |
6184 | } | |
6185 | } | |
6186 | \f | |
6187 | /* Return the name of the virtual function pointer field | |
6188 | (as an IDENTIFIER_NODE) for the given TYPE. Note that | |
6189 | this may have to look back through base types to find the | |
6190 | ultimate field name. (For single inheritance, these could | |
6191 | all be the same name. Who knows for multiple inheritance). */ | |
6192 | ||
6193 | static tree | |
94edc4ab | 6194 | get_vfield_name (tree type) |
ca36f057 MM |
6195 | { |
6196 | tree binfo = TYPE_BINFO (type); | |
6197 | char *buf; | |
6198 | ||
6199 | while (BINFO_BASETYPES (binfo) | |
6200 | && TYPE_CONTAINS_VPTR_P (BINFO_TYPE (BINFO_BASETYPE (binfo, 0))) | |
6201 | && ! TREE_VIA_VIRTUAL (BINFO_BASETYPE (binfo, 0))) | |
6202 | binfo = BINFO_BASETYPE (binfo, 0); | |
6203 | ||
6204 | type = BINFO_TYPE (binfo); | |
c68b0a84 | 6205 | buf = alloca (sizeof (VFIELD_NAME_FORMAT) + TYPE_NAME_LENGTH (type) + 2); |
ea122333 JM |
6206 | sprintf (buf, VFIELD_NAME_FORMAT, |
6207 | IDENTIFIER_POINTER (constructor_name (type))); | |
ca36f057 MM |
6208 | return get_identifier (buf); |
6209 | } | |
6210 | ||
6211 | void | |
94edc4ab | 6212 | print_class_statistics (void) |
ca36f057 MM |
6213 | { |
6214 | #ifdef GATHER_STATISTICS | |
6215 | fprintf (stderr, "convert_harshness = %d\n", n_convert_harshness); | |
6216 | fprintf (stderr, "compute_conversion_costs = %d\n", n_compute_conversion_costs); | |
6217 | fprintf (stderr, "build_method_call = %d (inner = %d)\n", | |
6218 | n_build_method_call, n_inner_fields_searched); | |
6219 | if (n_vtables) | |
6220 | { | |
6221 | fprintf (stderr, "vtables = %d; vtable searches = %d\n", | |
6222 | n_vtables, n_vtable_searches); | |
6223 | fprintf (stderr, "vtable entries = %d; vtable elems = %d\n", | |
6224 | n_vtable_entries, n_vtable_elems); | |
6225 | } | |
6226 | #endif | |
6227 | } | |
6228 | ||
6229 | /* Build a dummy reference to ourselves so Derived::Base (and A::A) works, | |
6230 | according to [class]: | |
6231 | The class-name is also inserted | |
6232 | into the scope of the class itself. For purposes of access checking, | |
6233 | the inserted class name is treated as if it were a public member name. */ | |
6234 | ||
6235 | void | |
94edc4ab | 6236 | build_self_reference (void) |
ca36f057 MM |
6237 | { |
6238 | tree name = constructor_name (current_class_type); | |
6239 | tree value = build_lang_decl (TYPE_DECL, name, current_class_type); | |
6240 | tree saved_cas; | |
6241 | ||
6242 | DECL_NONLOCAL (value) = 1; | |
6243 | DECL_CONTEXT (value) = current_class_type; | |
6244 | DECL_ARTIFICIAL (value) = 1; | |
a3d87771 | 6245 | SET_DECL_SELF_REFERENCE_P (value); |
ca36f057 MM |
6246 | |
6247 | if (processing_template_decl) | |
6248 | value = push_template_decl (value); | |
6249 | ||
6250 | saved_cas = current_access_specifier; | |
6251 | current_access_specifier = access_public_node; | |
6252 | finish_member_declaration (value); | |
6253 | current_access_specifier = saved_cas; | |
6254 | } | |
6255 | ||
6256 | /* Returns 1 if TYPE contains only padding bytes. */ | |
6257 | ||
6258 | int | |
94edc4ab | 6259 | is_empty_class (tree type) |
ca36f057 | 6260 | { |
ca36f057 MM |
6261 | if (type == error_mark_node) |
6262 | return 0; | |
6263 | ||
6264 | if (! IS_AGGR_TYPE (type)) | |
6265 | return 0; | |
6266 | ||
58731fd1 MM |
6267 | /* In G++ 3.2, whether or not a class was empty was determined by |
6268 | looking at its size. */ | |
6269 | if (abi_version_at_least (2)) | |
6270 | return CLASSTYPE_EMPTY_P (type); | |
6271 | else | |
6272 | return integer_zerop (CLASSTYPE_SIZE (type)); | |
ca36f057 MM |
6273 | } |
6274 | ||
956d9305 MM |
6275 | /* Returns true if TYPE contains an empty class. */ |
6276 | ||
6277 | static bool | |
6278 | contains_empty_class_p (tree type) | |
6279 | { | |
6280 | if (is_empty_class (type)) | |
6281 | return true; | |
6282 | if (CLASS_TYPE_P (type)) | |
6283 | { | |
6284 | tree field; | |
6285 | int i; | |
6286 | ||
6287 | for (i = 0; i < CLASSTYPE_N_BASECLASSES (type); ++i) | |
6288 | if (contains_empty_class_p (TYPE_BINFO_BASETYPE (type, i))) | |
6289 | return true; | |
6290 | for (field = TYPE_FIELDS (type); field; field = TREE_CHAIN (field)) | |
17bbb839 MM |
6291 | if (TREE_CODE (field) == FIELD_DECL |
6292 | && !DECL_ARTIFICIAL (field) | |
6293 | && is_empty_class (TREE_TYPE (field))) | |
956d9305 MM |
6294 | return true; |
6295 | } | |
6296 | else if (TREE_CODE (type) == ARRAY_TYPE) | |
6297 | return contains_empty_class_p (TREE_TYPE (type)); | |
6298 | return false; | |
6299 | } | |
6300 | ||
ca36f057 MM |
6301 | /* Find the enclosing class of the given NODE. NODE can be a *_DECL or |
6302 | a *_TYPE node. NODE can also be a local class. */ | |
6303 | ||
6304 | tree | |
94edc4ab | 6305 | get_enclosing_class (tree type) |
ca36f057 MM |
6306 | { |
6307 | tree node = type; | |
6308 | ||
6309 | while (node && TREE_CODE (node) != NAMESPACE_DECL) | |
6310 | { | |
6311 | switch (TREE_CODE_CLASS (TREE_CODE (node))) | |
6312 | { | |
6313 | case 'd': | |
6314 | node = DECL_CONTEXT (node); | |
6315 | break; | |
6316 | ||
6317 | case 't': | |
6318 | if (node != type) | |
6319 | return node; | |
6320 | node = TYPE_CONTEXT (node); | |
6321 | break; | |
6322 | ||
6323 | default: | |
a98facb0 | 6324 | abort (); |
ca36f057 MM |
6325 | } |
6326 | } | |
6327 | return NULL_TREE; | |
6328 | } | |
6329 | ||
ca36f057 MM |
6330 | /* Note that NAME was looked up while the current class was being |
6331 | defined and that the result of that lookup was DECL. */ | |
6332 | ||
6333 | void | |
94edc4ab | 6334 | maybe_note_name_used_in_class (tree name, tree decl) |
ca36f057 MM |
6335 | { |
6336 | splay_tree names_used; | |
6337 | ||
6338 | /* If we're not defining a class, there's nothing to do. */ | |
6339 | if (!current_class_type || !TYPE_BEING_DEFINED (current_class_type)) | |
6340 | return; | |
6341 | ||
6342 | /* If there's already a binding for this NAME, then we don't have | |
6343 | anything to worry about. */ | |
6344 | if (IDENTIFIER_CLASS_VALUE (name)) | |
6345 | return; | |
6346 | ||
6347 | if (!current_class_stack[current_class_depth - 1].names_used) | |
6348 | current_class_stack[current_class_depth - 1].names_used | |
6349 | = splay_tree_new (splay_tree_compare_pointers, 0, 0); | |
6350 | names_used = current_class_stack[current_class_depth - 1].names_used; | |
6351 | ||
6352 | splay_tree_insert (names_used, | |
6353 | (splay_tree_key) name, | |
6354 | (splay_tree_value) decl); | |
6355 | } | |
6356 | ||
6357 | /* Note that NAME was declared (as DECL) in the current class. Check | |
0e339752 | 6358 | to see that the declaration is valid. */ |
ca36f057 MM |
6359 | |
6360 | void | |
94edc4ab | 6361 | note_name_declared_in_class (tree name, tree decl) |
ca36f057 MM |
6362 | { |
6363 | splay_tree names_used; | |
6364 | splay_tree_node n; | |
6365 | ||
6366 | /* Look to see if we ever used this name. */ | |
6367 | names_used | |
6368 | = current_class_stack[current_class_depth - 1].names_used; | |
6369 | if (!names_used) | |
6370 | return; | |
6371 | ||
6372 | n = splay_tree_lookup (names_used, (splay_tree_key) name); | |
6373 | if (n) | |
6374 | { | |
6375 | /* [basic.scope.class] | |
6376 | ||
6377 | A name N used in a class S shall refer to the same declaration | |
6378 | in its context and when re-evaluated in the completed scope of | |
6379 | S. */ | |
33bd39a2 | 6380 | error ("declaration of `%#D'", decl); |
38da6039 NS |
6381 | cp_error_at ("changes meaning of `%D' from `%+#D'", |
6382 | DECL_NAME (OVL_CURRENT (decl)), | |
ca36f057 MM |
6383 | (tree) n->value); |
6384 | } | |
6385 | } | |
6386 | ||
3461fba7 NS |
6387 | /* Returns the VAR_DECL for the complete vtable associated with BINFO. |
6388 | Secondary vtables are merged with primary vtables; this function | |
6389 | will return the VAR_DECL for the primary vtable. */ | |
ca36f057 | 6390 | |
c35cce41 | 6391 | tree |
94edc4ab | 6392 | get_vtbl_decl_for_binfo (tree binfo) |
c35cce41 MM |
6393 | { |
6394 | tree decl; | |
6395 | ||
6396 | decl = BINFO_VTABLE (binfo); | |
6397 | if (decl && TREE_CODE (decl) == PLUS_EXPR) | |
6398 | { | |
6399 | my_friendly_assert (TREE_CODE (TREE_OPERAND (decl, 0)) == ADDR_EXPR, | |
6400 | 2000403); | |
6401 | decl = TREE_OPERAND (TREE_OPERAND (decl, 0), 0); | |
6402 | } | |
6403 | if (decl) | |
6404 | my_friendly_assert (TREE_CODE (decl) == VAR_DECL, 20000403); | |
6405 | return decl; | |
6406 | } | |
6407 | ||
911a71a7 | 6408 | |
dbbf88d1 NS |
6409 | /* Returns the binfo for the primary base of BINFO. If the resulting |
6410 | BINFO is a virtual base, and it is inherited elsewhere in the | |
6411 | hierarchy, then the returned binfo might not be the primary base of | |
6412 | BINFO in the complete object. Check BINFO_PRIMARY_P or | |
6413 | BINFO_LOST_PRIMARY_P to be sure. */ | |
911a71a7 MM |
6414 | |
6415 | tree | |
94edc4ab | 6416 | get_primary_binfo (tree binfo) |
911a71a7 MM |
6417 | { |
6418 | tree primary_base; | |
dbbf88d1 | 6419 | tree result; |
623fe76a | 6420 | |
911a71a7 MM |
6421 | primary_base = CLASSTYPE_PRIMARY_BINFO (BINFO_TYPE (binfo)); |
6422 | if (!primary_base) | |
6423 | return NULL_TREE; | |
6424 | ||
dbbf88d1 | 6425 | result = copied_binfo (primary_base, binfo); |
911a71a7 MM |
6426 | return result; |
6427 | } | |
6428 | ||
838dfd8a | 6429 | /* If INDENTED_P is zero, indent to INDENT. Return nonzero. */ |
b7442fb5 NS |
6430 | |
6431 | static int | |
94edc4ab | 6432 | maybe_indent_hierarchy (FILE * stream, int indent, int indented_p) |
b7442fb5 NS |
6433 | { |
6434 | if (!indented_p) | |
6435 | fprintf (stream, "%*s", indent, ""); | |
6436 | return 1; | |
6437 | } | |
6438 | ||
dbbf88d1 NS |
6439 | /* Dump the offsets of all the bases rooted at BINFO to STREAM. |
6440 | INDENT should be zero when called from the top level; it is | |
6441 | incremented recursively. IGO indicates the next expected BINFO in | |
9bcb9aae | 6442 | inheritance graph ordering. */ |
c35cce41 | 6443 | |
dbbf88d1 NS |
6444 | static tree |
6445 | dump_class_hierarchy_r (FILE *stream, | |
94edc4ab | 6446 | int flags, |
94edc4ab | 6447 | tree binfo, |
dbbf88d1 | 6448 | tree igo, |
94edc4ab | 6449 | int indent) |
ca36f057 | 6450 | { |
b7442fb5 | 6451 | int indented = 0; |
dbbf88d1 | 6452 | tree base_binfos; |
b7442fb5 NS |
6453 | |
6454 | indented = maybe_indent_hierarchy (stream, indent, 0); | |
6455 | fprintf (stream, "%s (0x%lx) ", | |
6456 | type_as_string (binfo, TFF_PLAIN_IDENTIFIER), | |
6457 | (unsigned long) binfo); | |
dbbf88d1 NS |
6458 | if (binfo != igo) |
6459 | { | |
6460 | fprintf (stream, "alternative-path\n"); | |
6461 | return igo; | |
6462 | } | |
6463 | igo = TREE_CHAIN (binfo); | |
6464 | ||
9965d119 | 6465 | fprintf (stream, HOST_WIDE_INT_PRINT_DEC, |
ca36f057 | 6466 | tree_low_cst (BINFO_OFFSET (binfo), 0)); |
9965d119 NS |
6467 | if (is_empty_class (BINFO_TYPE (binfo))) |
6468 | fprintf (stream, " empty"); | |
6469 | else if (CLASSTYPE_NEARLY_EMPTY_P (BINFO_TYPE (binfo))) | |
6470 | fprintf (stream, " nearly-empty"); | |
c35cce41 | 6471 | if (TREE_VIA_VIRTUAL (binfo)) |
dbbf88d1 | 6472 | fprintf (stream, " virtual"); |
9965d119 | 6473 | fprintf (stream, "\n"); |
ca36f057 | 6474 | |
b7442fb5 NS |
6475 | indented = 0; |
6476 | if (BINFO_PRIMARY_BASE_OF (binfo)) | |
6477 | { | |
6478 | indented = maybe_indent_hierarchy (stream, indent + 3, indented); | |
6479 | fprintf (stream, " primary-for %s (0x%lx)", | |
6480 | type_as_string (BINFO_PRIMARY_BASE_OF (binfo), | |
6481 | TFF_PLAIN_IDENTIFIER), | |
6482 | (unsigned long)BINFO_PRIMARY_BASE_OF (binfo)); | |
6483 | } | |
6484 | if (BINFO_LOST_PRIMARY_P (binfo)) | |
6485 | { | |
6486 | indented = maybe_indent_hierarchy (stream, indent + 3, indented); | |
6487 | fprintf (stream, " lost-primary"); | |
6488 | } | |
6489 | if (indented) | |
6490 | fprintf (stream, "\n"); | |
6491 | ||
6492 | if (!(flags & TDF_SLIM)) | |
6493 | { | |
6494 | int indented = 0; | |
6495 | ||
6496 | if (BINFO_SUBVTT_INDEX (binfo)) | |
6497 | { | |
6498 | indented = maybe_indent_hierarchy (stream, indent + 3, indented); | |
6499 | fprintf (stream, " subvttidx=%s", | |
6500 | expr_as_string (BINFO_SUBVTT_INDEX (binfo), | |
6501 | TFF_PLAIN_IDENTIFIER)); | |
6502 | } | |
6503 | if (BINFO_VPTR_INDEX (binfo)) | |
6504 | { | |
6505 | indented = maybe_indent_hierarchy (stream, indent + 3, indented); | |
6506 | fprintf (stream, " vptridx=%s", | |
6507 | expr_as_string (BINFO_VPTR_INDEX (binfo), | |
6508 | TFF_PLAIN_IDENTIFIER)); | |
6509 | } | |
6510 | if (BINFO_VPTR_FIELD (binfo)) | |
6511 | { | |
6512 | indented = maybe_indent_hierarchy (stream, indent + 3, indented); | |
6513 | fprintf (stream, " vbaseoffset=%s", | |
6514 | expr_as_string (BINFO_VPTR_FIELD (binfo), | |
6515 | TFF_PLAIN_IDENTIFIER)); | |
6516 | } | |
6517 | if (BINFO_VTABLE (binfo)) | |
6518 | { | |
6519 | indented = maybe_indent_hierarchy (stream, indent + 3, indented); | |
6520 | fprintf (stream, " vptr=%s", | |
6521 | expr_as_string (BINFO_VTABLE (binfo), | |
6522 | TFF_PLAIN_IDENTIFIER)); | |
6523 | } | |
6524 | ||
6525 | if (indented) | |
6526 | fprintf (stream, "\n"); | |
6527 | } | |
6528 | ||
dbbf88d1 NS |
6529 | base_binfos = BINFO_BASETYPES (binfo); |
6530 | if (base_binfos) | |
6531 | { | |
6532 | int ix, n; | |
b7442fb5 | 6533 | |
dbbf88d1 NS |
6534 | n = TREE_VEC_LENGTH (base_binfos); |
6535 | for (ix = 0; ix != n; ix++) | |
6536 | { | |
6537 | tree base_binfo = TREE_VEC_ELT (base_binfos, ix); | |
6538 | ||
6539 | igo = dump_class_hierarchy_r (stream, flags, base_binfo, | |
6540 | igo, indent + 2); | |
6541 | } | |
6542 | } | |
6543 | ||
6544 | return igo; | |
c35cce41 MM |
6545 | } |
6546 | ||
6547 | /* Dump the BINFO hierarchy for T. */ | |
6548 | ||
b7442fb5 | 6549 | static void |
94edc4ab | 6550 | dump_class_hierarchy (tree t) |
c35cce41 | 6551 | { |
b7442fb5 NS |
6552 | int flags; |
6553 | FILE *stream = dump_begin (TDI_class, &flags); | |
6554 | ||
6555 | if (!stream) | |
6556 | return; | |
9965d119 | 6557 | |
b7442fb5 NS |
6558 | fprintf (stream, "Class %s\n", type_as_string (t, TFF_PLAIN_IDENTIFIER)); |
6559 | fprintf (stream, " size=%lu align=%lu\n", | |
6560 | (unsigned long)(tree_low_cst (TYPE_SIZE (t), 0) / BITS_PER_UNIT), | |
6561 | (unsigned long)(TYPE_ALIGN (t) / BITS_PER_UNIT)); | |
dbbf88d1 NS |
6562 | fprintf (stream, " base size=%lu base align=%lu\n", |
6563 | (unsigned long)(tree_low_cst (TYPE_SIZE (CLASSTYPE_AS_BASE (t)), 0) | |
6564 | / BITS_PER_UNIT), | |
6565 | (unsigned long)(TYPE_ALIGN (CLASSTYPE_AS_BASE (t)) | |
6566 | / BITS_PER_UNIT)); | |
6567 | dump_class_hierarchy_r (stream, flags, TYPE_BINFO (t), TYPE_BINFO (t), 0); | |
b7442fb5 NS |
6568 | fprintf (stream, "\n"); |
6569 | dump_end (TDI_class, stream); | |
6570 | } | |
6571 | ||
6572 | static void | |
94edc4ab | 6573 | dump_array (FILE * stream, tree decl) |
b7442fb5 NS |
6574 | { |
6575 | tree inits; | |
6576 | int ix; | |
6577 | HOST_WIDE_INT elt; | |
6578 | tree size = TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (decl))); | |
6579 | ||
6580 | elt = (tree_low_cst (TYPE_SIZE (TREE_TYPE (TREE_TYPE (decl))), 0) | |
6581 | / BITS_PER_UNIT); | |
6582 | fprintf (stream, "%s:", decl_as_string (decl, TFF_PLAIN_IDENTIFIER)); | |
6583 | fprintf (stream, " %s entries", | |
6584 | expr_as_string (size_binop (PLUS_EXPR, size, size_one_node), | |
6585 | TFF_PLAIN_IDENTIFIER)); | |
6586 | fprintf (stream, "\n"); | |
6587 | ||
522801e7 | 6588 | for (ix = 0, inits = CONSTRUCTOR_ELTS (DECL_INITIAL (decl)); |
b7442fb5 | 6589 | inits; ix++, inits = TREE_CHAIN (inits)) |
4fdc14ca | 6590 | fprintf (stream, "%-4ld %s\n", (long)(ix * elt), |
b7442fb5 NS |
6591 | expr_as_string (TREE_VALUE (inits), TFF_PLAIN_IDENTIFIER)); |
6592 | } | |
6593 | ||
6594 | static void | |
94edc4ab | 6595 | dump_vtable (tree t, tree binfo, tree vtable) |
b7442fb5 NS |
6596 | { |
6597 | int flags; | |
6598 | FILE *stream = dump_begin (TDI_class, &flags); | |
6599 | ||
6600 | if (!stream) | |
6601 | return; | |
6602 | ||
6603 | if (!(flags & TDF_SLIM)) | |
9965d119 | 6604 | { |
b7442fb5 | 6605 | int ctor_vtbl_p = TYPE_BINFO (t) != binfo; |
9965d119 | 6606 | |
b7442fb5 NS |
6607 | fprintf (stream, "%s for %s", |
6608 | ctor_vtbl_p ? "Construction vtable" : "Vtable", | |
6609 | type_as_string (binfo, TFF_PLAIN_IDENTIFIER)); | |
6610 | if (ctor_vtbl_p) | |
6611 | { | |
6612 | if (!TREE_VIA_VIRTUAL (binfo)) | |
6613 | fprintf (stream, " (0x%lx instance)", (unsigned long)binfo); | |
6614 | fprintf (stream, " in %s", type_as_string (t, TFF_PLAIN_IDENTIFIER)); | |
6615 | } | |
6616 | fprintf (stream, "\n"); | |
6617 | dump_array (stream, vtable); | |
6618 | fprintf (stream, "\n"); | |
9965d119 | 6619 | } |
b7442fb5 NS |
6620 | |
6621 | dump_end (TDI_class, stream); | |
6622 | } | |
6623 | ||
6624 | static void | |
94edc4ab | 6625 | dump_vtt (tree t, tree vtt) |
b7442fb5 NS |
6626 | { |
6627 | int flags; | |
6628 | FILE *stream = dump_begin (TDI_class, &flags); | |
6629 | ||
6630 | if (!stream) | |
6631 | return; | |
6632 | ||
6633 | if (!(flags & TDF_SLIM)) | |
6634 | { | |
6635 | fprintf (stream, "VTT for %s\n", | |
6636 | type_as_string (t, TFF_PLAIN_IDENTIFIER)); | |
6637 | dump_array (stream, vtt); | |
6638 | fprintf (stream, "\n"); | |
6639 | } | |
6640 | ||
6641 | dump_end (TDI_class, stream); | |
ca36f057 MM |
6642 | } |
6643 | ||
6644 | /* Virtual function table initialization. */ | |
6645 | ||
6646 | /* Create all the necessary vtables for T and its base classes. */ | |
6647 | ||
6648 | static void | |
94edc4ab | 6649 | finish_vtbls (tree t) |
ca36f057 | 6650 | { |
3461fba7 NS |
6651 | tree list; |
6652 | tree vbase; | |
ca36f057 | 6653 | |
3461fba7 NS |
6654 | /* We lay out the primary and secondary vtables in one contiguous |
6655 | vtable. The primary vtable is first, followed by the non-virtual | |
6656 | secondary vtables in inheritance graph order. */ | |
6657 | list = build_tree_list (TYPE_BINFO_VTABLE (t), NULL_TREE); | |
6658 | accumulate_vtbl_inits (TYPE_BINFO (t), TYPE_BINFO (t), | |
6659 | TYPE_BINFO (t), t, list); | |
6660 | ||
6661 | /* Then come the virtual bases, also in inheritance graph order. */ | |
6662 | for (vbase = TYPE_BINFO (t); vbase; vbase = TREE_CHAIN (vbase)) | |
6663 | { | |
3461fba7 NS |
6664 | if (!TREE_VIA_VIRTUAL (vbase)) |
6665 | continue; | |
dbbf88d1 | 6666 | accumulate_vtbl_inits (vbase, vbase, TYPE_BINFO (t), t, list); |
ff668506 JM |
6667 | } |
6668 | ||
3461fba7 NS |
6669 | if (TYPE_BINFO_VTABLE (t)) |
6670 | initialize_vtable (TYPE_BINFO (t), TREE_VALUE (list)); | |
ca36f057 MM |
6671 | } |
6672 | ||
6673 | /* Initialize the vtable for BINFO with the INITS. */ | |
6674 | ||
6675 | static void | |
94edc4ab | 6676 | initialize_vtable (tree binfo, tree inits) |
ca36f057 | 6677 | { |
ca36f057 MM |
6678 | tree decl; |
6679 | ||
6680 | layout_vtable_decl (binfo, list_length (inits)); | |
c35cce41 | 6681 | decl = get_vtbl_decl_for_binfo (binfo); |
23656158 | 6682 | initialize_array (decl, inits); |
b7442fb5 | 6683 | dump_vtable (BINFO_TYPE (binfo), binfo, decl); |
23656158 MM |
6684 | } |
6685 | ||
6686 | /* Initialize DECL (a declaration for a namespace-scope array) with | |
6687 | the INITS. */ | |
6688 | ||
6689 | static void | |
94edc4ab | 6690 | initialize_array (tree decl, tree inits) |
23656158 MM |
6691 | { |
6692 | tree context; | |
6693 | ||
ca36f057 | 6694 | context = DECL_CONTEXT (decl); |
23656158 | 6695 | DECL_CONTEXT (decl) = NULL_TREE; |
dcf92453 | 6696 | DECL_INITIAL (decl) = build_constructor (NULL_TREE, inits); |
8e3df2de | 6697 | TREE_HAS_CONSTRUCTOR (DECL_INITIAL (decl)) = 1; |
ca36f057 MM |
6698 | cp_finish_decl (decl, DECL_INITIAL (decl), NULL_TREE, 0); |
6699 | DECL_CONTEXT (decl) = context; | |
6700 | } | |
6701 | ||
9965d119 NS |
6702 | /* Build the VTT (virtual table table) for T. |
6703 | A class requires a VTT if it has virtual bases. | |
6704 | ||
6705 | This holds | |
6706 | 1 - primary virtual pointer for complete object T | |
90ecce3e JM |
6707 | 2 - secondary VTTs for each direct non-virtual base of T which requires a |
6708 | VTT | |
9965d119 NS |
6709 | 3 - secondary virtual pointers for each direct or indirect base of T which |
6710 | has virtual bases or is reachable via a virtual path from T. | |
6711 | 4 - secondary VTTs for each direct or indirect virtual base of T. | |
6712 | ||
6713 | Secondary VTTs look like complete object VTTs without part 4. */ | |
23656158 MM |
6714 | |
6715 | static void | |
94edc4ab | 6716 | build_vtt (tree t) |
23656158 MM |
6717 | { |
6718 | tree inits; | |
6719 | tree type; | |
6720 | tree vtt; | |
3ec6bad3 | 6721 | tree index; |
23656158 | 6722 | |
23656158 MM |
6723 | /* Build up the initializers for the VTT. */ |
6724 | inits = NULL_TREE; | |
3ec6bad3 | 6725 | index = size_zero_node; |
9965d119 | 6726 | build_vtt_inits (TYPE_BINFO (t), t, &inits, &index); |
23656158 MM |
6727 | |
6728 | /* If we didn't need a VTT, we're done. */ | |
6729 | if (!inits) | |
6730 | return; | |
6731 | ||
6732 | /* Figure out the type of the VTT. */ | |
442e01b6 | 6733 | type = build_index_type (size_int (list_length (inits) - 1)); |
23656158 MM |
6734 | type = build_cplus_array_type (const_ptr_type_node, type); |
6735 | ||
6736 | /* Now, build the VTT object itself. */ | |
669ec2b4 | 6737 | vtt = build_vtable (t, get_vtt_name (t), type); |
23656158 | 6738 | initialize_array (vtt, inits); |
548502d3 MM |
6739 | /* Add the VTT to the vtables list. */ |
6740 | TREE_CHAIN (vtt) = TREE_CHAIN (CLASSTYPE_VTABLES (t)); | |
6741 | TREE_CHAIN (CLASSTYPE_VTABLES (t)) = vtt; | |
b7442fb5 NS |
6742 | |
6743 | dump_vtt (t, vtt); | |
23656158 MM |
6744 | } |
6745 | ||
13de7ec4 JM |
6746 | /* When building a secondary VTT, BINFO_VTABLE is set to a TREE_LIST with |
6747 | PURPOSE the RTTI_BINFO, VALUE the real vtable pointer for this binfo, | |
6748 | and CHAIN the vtable pointer for this binfo after construction is | |
00a17e31 | 6749 | complete. VALUE can also be another BINFO, in which case we recurse. */ |
13de7ec4 JM |
6750 | |
6751 | static tree | |
94edc4ab | 6752 | binfo_ctor_vtable (tree binfo) |
13de7ec4 JM |
6753 | { |
6754 | tree vt; | |
6755 | ||
6756 | while (1) | |
6757 | { | |
6758 | vt = BINFO_VTABLE (binfo); | |
6759 | if (TREE_CODE (vt) == TREE_LIST) | |
6760 | vt = TREE_VALUE (vt); | |
6761 | if (TREE_CODE (vt) == TREE_VEC) | |
6762 | binfo = vt; | |
6763 | else | |
6764 | break; | |
6765 | } | |
6766 | ||
6767 | return vt; | |
6768 | } | |
6769 | ||
23656158 | 6770 | /* Recursively build the VTT-initializer for BINFO (which is in the |
9965d119 NS |
6771 | hierarchy dominated by T). INITS points to the end of the initializer |
6772 | list to date. INDEX is the VTT index where the next element will be | |
6773 | replaced. Iff BINFO is the binfo for T, this is the top level VTT (i.e. | |
6774 | not a subvtt for some base of T). When that is so, we emit the sub-VTTs | |
6775 | for virtual bases of T. When it is not so, we build the constructor | |
6776 | vtables for the BINFO-in-T variant. */ | |
23656158 MM |
6777 | |
6778 | static tree * | |
94edc4ab | 6779 | build_vtt_inits (tree binfo, tree t, tree* inits, tree* index) |
23656158 MM |
6780 | { |
6781 | int i; | |
6782 | tree b; | |
6783 | tree init; | |
6784 | tree secondary_vptrs; | |
9965d119 | 6785 | int top_level_p = same_type_p (TREE_TYPE (binfo), t); |
23656158 MM |
6786 | |
6787 | /* We only need VTTs for subobjects with virtual bases. */ | |
6788 | if (!TYPE_USES_VIRTUAL_BASECLASSES (BINFO_TYPE (binfo))) | |
6789 | return inits; | |
6790 | ||
6791 | /* We need to use a construction vtable if this is not the primary | |
6792 | VTT. */ | |
9965d119 | 6793 | if (!top_level_p) |
3ec6bad3 MM |
6794 | { |
6795 | build_ctor_vtbl_group (binfo, t); | |
6796 | ||
6797 | /* Record the offset in the VTT where this sub-VTT can be found. */ | |
6798 | BINFO_SUBVTT_INDEX (binfo) = *index; | |
6799 | } | |
23656158 MM |
6800 | |
6801 | /* Add the address of the primary vtable for the complete object. */ | |
13de7ec4 | 6802 | init = binfo_ctor_vtable (binfo); |
23656158 MM |
6803 | *inits = build_tree_list (NULL_TREE, init); |
6804 | inits = &TREE_CHAIN (*inits); | |
9965d119 NS |
6805 | if (top_level_p) |
6806 | { | |
6807 | my_friendly_assert (!BINFO_VPTR_INDEX (binfo), 20010129); | |
6808 | BINFO_VPTR_INDEX (binfo) = *index; | |
6809 | } | |
3ec6bad3 MM |
6810 | *index = size_binop (PLUS_EXPR, *index, TYPE_SIZE_UNIT (ptr_type_node)); |
6811 | ||
23656158 MM |
6812 | /* Recursively add the secondary VTTs for non-virtual bases. */ |
6813 | for (i = 0; i < BINFO_N_BASETYPES (binfo); ++i) | |
6814 | { | |
6815 | b = BINFO_BASETYPE (binfo, i); | |
6816 | if (!TREE_VIA_VIRTUAL (b)) | |
9ccf6541 | 6817 | inits = build_vtt_inits (BINFO_BASETYPE (binfo, i), t, |
9ccf6541 | 6818 | inits, index); |
23656158 | 6819 | } |
3ec6bad3 | 6820 | |
23656158 | 6821 | /* Add secondary virtual pointers for all subobjects of BINFO with |
9965d119 NS |
6822 | either virtual bases or reachable along a virtual path, except |
6823 | subobjects that are non-virtual primary bases. */ | |
9ccf6541 | 6824 | secondary_vptrs = tree_cons (t, NULL_TREE, BINFO_TYPE (binfo)); |
3ec6bad3 | 6825 | TREE_TYPE (secondary_vptrs) = *index; |
9965d119 NS |
6826 | VTT_TOP_LEVEL_P (secondary_vptrs) = top_level_p; |
6827 | VTT_MARKED_BINFO_P (secondary_vptrs) = 0; | |
6828 | ||
23656158 | 6829 | dfs_walk_real (binfo, |
9ccf6541 | 6830 | dfs_build_secondary_vptr_vtt_inits, |
23656158 | 6831 | NULL, |
9965d119 | 6832 | dfs_ctor_vtable_bases_queue_p, |
23656158 | 6833 | secondary_vptrs); |
9965d119 NS |
6834 | VTT_MARKED_BINFO_P (secondary_vptrs) = 1; |
6835 | dfs_walk (binfo, dfs_unmark, dfs_ctor_vtable_bases_queue_p, | |
6836 | secondary_vptrs); | |
6837 | ||
3ec6bad3 | 6838 | *index = TREE_TYPE (secondary_vptrs); |
23656158 MM |
6839 | |
6840 | /* The secondary vptrs come back in reverse order. After we reverse | |
6841 | them, and add the INITS, the last init will be the first element | |
6842 | of the chain. */ | |
6843 | secondary_vptrs = TREE_VALUE (secondary_vptrs); | |
6844 | if (secondary_vptrs) | |
6845 | { | |
6846 | *inits = nreverse (secondary_vptrs); | |
6847 | inits = &TREE_CHAIN (secondary_vptrs); | |
6848 | my_friendly_assert (*inits == NULL_TREE, 20000517); | |
6849 | } | |
6850 | ||
6851 | /* Add the secondary VTTs for virtual bases. */ | |
9965d119 | 6852 | if (top_level_p) |
9ccf6541 MM |
6853 | for (b = TYPE_BINFO (BINFO_TYPE (binfo)); b; b = TREE_CHAIN (b)) |
6854 | { | |
9ccf6541 MM |
6855 | if (!TREE_VIA_VIRTUAL (b)) |
6856 | continue; | |
6857 | ||
dbbf88d1 | 6858 | inits = build_vtt_inits (b, t, inits, index); |
9ccf6541 | 6859 | } |
23656158 | 6860 | |
9965d119 NS |
6861 | if (!top_level_p) |
6862 | { | |
6863 | tree data = tree_cons (t, binfo, NULL_TREE); | |
6864 | VTT_TOP_LEVEL_P (data) = 0; | |
6865 | VTT_MARKED_BINFO_P (data) = 0; | |
6866 | ||
6867 | dfs_walk (binfo, dfs_fixup_binfo_vtbls, | |
6868 | dfs_ctor_vtable_bases_queue_p, | |
6869 | data); | |
6870 | } | |
23656158 MM |
6871 | |
6872 | return inits; | |
6873 | } | |
6874 | ||
9965d119 NS |
6875 | /* Called from build_vtt_inits via dfs_walk. BINFO is the binfo |
6876 | for the base in most derived. DATA is a TREE_LIST who's | |
6877 | TREE_CHAIN is the type of the base being | |
6878 | constructed whilst this secondary vptr is live. The TREE_UNSIGNED | |
6879 | flag of DATA indicates that this is a constructor vtable. The | |
6880 | TREE_TOP_LEVEL flag indicates that this is the primary VTT. */ | |
23656158 MM |
6881 | |
6882 | static tree | |
94edc4ab | 6883 | dfs_build_secondary_vptr_vtt_inits (tree binfo, void* data) |
23656158 MM |
6884 | { |
6885 | tree l; | |
6886 | tree t; | |
6887 | tree init; | |
3ec6bad3 | 6888 | tree index; |
9965d119 | 6889 | int top_level_p; |
23656158 MM |
6890 | |
6891 | l = (tree) data; | |
9ccf6541 | 6892 | t = TREE_CHAIN (l); |
9965d119 NS |
6893 | top_level_p = VTT_TOP_LEVEL_P (l); |
6894 | ||
dbbf88d1 | 6895 | BINFO_MARKED (binfo) = 1; |
23656158 MM |
6896 | |
6897 | /* We don't care about bases that don't have vtables. */ | |
6898 | if (!TYPE_VFIELD (BINFO_TYPE (binfo))) | |
6899 | return NULL_TREE; | |
6900 | ||
6901 | /* We're only interested in proper subobjects of T. */ | |
6902 | if (same_type_p (BINFO_TYPE (binfo), t)) | |
6903 | return NULL_TREE; | |
6904 | ||
6905 | /* We're not interested in non-virtual primary bases. */ | |
9965d119 | 6906 | if (!TREE_VIA_VIRTUAL (binfo) && BINFO_PRIMARY_P (binfo)) |
23656158 MM |
6907 | return NULL_TREE; |
6908 | ||
9965d119 NS |
6909 | /* If BINFO has virtual bases or is reachable via a virtual path |
6910 | from T, it'll have a secondary vptr. */ | |
db3d8cde | 6911 | if (!TYPE_USES_VIRTUAL_BASECLASSES (BINFO_TYPE (binfo)) |
9965d119 | 6912 | && !binfo_via_virtual (binfo, t)) |
db3d8cde | 6913 | return NULL_TREE; |
23656158 | 6914 | |
3ec6bad3 MM |
6915 | /* Record the index where this secondary vptr can be found. */ |
6916 | index = TREE_TYPE (l); | |
9965d119 NS |
6917 | if (top_level_p) |
6918 | { | |
6919 | my_friendly_assert (!BINFO_VPTR_INDEX (binfo), 20010129); | |
6920 | BINFO_VPTR_INDEX (binfo) = index; | |
6921 | } | |
3ec6bad3 MM |
6922 | TREE_TYPE (l) = size_binop (PLUS_EXPR, index, |
6923 | TYPE_SIZE_UNIT (ptr_type_node)); | |
6924 | ||
6925 | /* Add the initializer for the secondary vptr itself. */ | |
9965d119 NS |
6926 | if (top_level_p && TREE_VIA_VIRTUAL (binfo)) |
6927 | { | |
6928 | /* It's a primary virtual base, and this is not the construction | |
6929 | vtable. Find the base this is primary of in the inheritance graph, | |
00a17e31 | 6930 | and use that base's vtable now. */ |
9965d119 NS |
6931 | while (BINFO_PRIMARY_BASE_OF (binfo)) |
6932 | binfo = BINFO_PRIMARY_BASE_OF (binfo); | |
6933 | } | |
13de7ec4 | 6934 | init = binfo_ctor_vtable (binfo); |
23656158 | 6935 | TREE_VALUE (l) = tree_cons (NULL_TREE, init, TREE_VALUE (l)); |
3ec6bad3 | 6936 | |
23656158 MM |
6937 | return NULL_TREE; |
6938 | } | |
6939 | ||
9965d119 | 6940 | /* dfs_walk_real predicate for building vtables. DATA is a TREE_LIST, |
b7ad2f8b NS |
6941 | VTT_MARKED_BINFO_P indicates whether marked or unmarked bases |
6942 | should be walked. TREE_PURPOSE is the TREE_TYPE that dominates the | |
6943 | hierarchy. */ | |
9965d119 NS |
6944 | |
6945 | static tree | |
dbbf88d1 NS |
6946 | dfs_ctor_vtable_bases_queue_p (tree derived, int ix, |
6947 | void* data) | |
9965d119 | 6948 | { |
dbbf88d1 NS |
6949 | tree binfo = BINFO_BASETYPE (derived, ix); |
6950 | ||
9965d119 NS |
6951 | if (!BINFO_MARKED (binfo) == VTT_MARKED_BINFO_P ((tree) data)) |
6952 | return NULL_TREE; | |
6953 | return binfo; | |
6954 | } | |
6955 | ||
6956 | /* Called from build_vtt_inits via dfs_walk. After building constructor | |
6957 | vtables and generating the sub-vtt from them, we need to restore the | |
6958 | BINFO_VTABLES that were scribbled on. DATA is a TREE_LIST whose | |
6959 | TREE_VALUE is the TREE_TYPE of the base whose sub vtt was generated. */ | |
23656158 MM |
6960 | |
6961 | static tree | |
94edc4ab | 6962 | dfs_fixup_binfo_vtbls (tree binfo, void* data) |
23656158 | 6963 | { |
dbbf88d1 | 6964 | BINFO_MARKED (binfo) = 0; |
23656158 MM |
6965 | |
6966 | /* We don't care about bases that don't have vtables. */ | |
6967 | if (!TYPE_VFIELD (BINFO_TYPE (binfo))) | |
6968 | return NULL_TREE; | |
6969 | ||
6970 | /* If we scribbled the construction vtable vptr into BINFO, clear it | |
6971 | out now. */ | |
85a9a0a2 NS |
6972 | if (BINFO_VTABLE (binfo) |
6973 | && TREE_CODE (BINFO_VTABLE (binfo)) == TREE_LIST | |
9ccf6541 MM |
6974 | && (TREE_PURPOSE (BINFO_VTABLE (binfo)) |
6975 | == TREE_VALUE ((tree) data))) | |
6976 | BINFO_VTABLE (binfo) = TREE_CHAIN (BINFO_VTABLE (binfo)); | |
23656158 MM |
6977 | |
6978 | return NULL_TREE; | |
6979 | } | |
6980 | ||
6981 | /* Build the construction vtable group for BINFO which is in the | |
6982 | hierarchy dominated by T. */ | |
6983 | ||
6984 | static void | |
94edc4ab | 6985 | build_ctor_vtbl_group (tree binfo, tree t) |
23656158 MM |
6986 | { |
6987 | tree list; | |
6988 | tree type; | |
6989 | tree vtbl; | |
6990 | tree inits; | |
6991 | tree id; | |
9ccf6541 | 6992 | tree vbase; |
23656158 | 6993 | |
7bdcf888 | 6994 | /* See if we've already created this construction vtable group. */ |
1f84ec23 | 6995 | id = mangle_ctor_vtbl_for_type (t, binfo); |
23656158 MM |
6996 | if (IDENTIFIER_GLOBAL_VALUE (id)) |
6997 | return; | |
6998 | ||
9965d119 | 6999 | my_friendly_assert (!same_type_p (BINFO_TYPE (binfo), t), 20010124); |
23656158 MM |
7000 | /* Build a version of VTBL (with the wrong type) for use in |
7001 | constructing the addresses of secondary vtables in the | |
7002 | construction vtable group. */ | |
459c43ad | 7003 | vtbl = build_vtable (t, id, ptr_type_node); |
23656158 MM |
7004 | list = build_tree_list (vtbl, NULL_TREE); |
7005 | accumulate_vtbl_inits (binfo, TYPE_BINFO (TREE_TYPE (binfo)), | |
7006 | binfo, t, list); | |
9965d119 NS |
7007 | |
7008 | /* Add the vtables for each of our virtual bases using the vbase in T | |
7009 | binfo. */ | |
7010 | for (vbase = TYPE_BINFO (BINFO_TYPE (binfo)); | |
9ccf6541 MM |
7011 | vbase; |
7012 | vbase = TREE_CHAIN (vbase)) | |
7013 | { | |
7014 | tree b; | |
7015 | ||
7016 | if (!TREE_VIA_VIRTUAL (vbase)) | |
7017 | continue; | |
dbbf88d1 | 7018 | b = copied_binfo (vbase, binfo); |
9965d119 | 7019 | |
dbbf88d1 | 7020 | accumulate_vtbl_inits (b, vbase, binfo, t, list); |
9ccf6541 | 7021 | } |
99389463 | 7022 | inits = TREE_VALUE (list); |
23656158 MM |
7023 | |
7024 | /* Figure out the type of the construction vtable. */ | |
442e01b6 | 7025 | type = build_index_type (size_int (list_length (inits) - 1)); |
23656158 MM |
7026 | type = build_cplus_array_type (vtable_entry_type, type); |
7027 | TREE_TYPE (vtbl) = type; | |
7028 | ||
7029 | /* Initialize the construction vtable. */ | |
548502d3 | 7030 | CLASSTYPE_VTABLES (t) = chainon (CLASSTYPE_VTABLES (t), vtbl); |
23656158 | 7031 | initialize_array (vtbl, inits); |
b7442fb5 | 7032 | dump_vtable (t, binfo, vtbl); |
23656158 MM |
7033 | } |
7034 | ||
9965d119 NS |
7035 | /* Add the vtbl initializers for BINFO (and its bases other than |
7036 | non-virtual primaries) to the list of INITS. BINFO is in the | |
7037 | hierarchy dominated by T. RTTI_BINFO is the binfo within T of | |
7038 | the constructor the vtbl inits should be accumulated for. (If this | |
7039 | is the complete object vtbl then RTTI_BINFO will be TYPE_BINFO (T).) | |
7040 | ORIG_BINFO is the binfo for this object within BINFO_TYPE (RTTI_BINFO). | |
7041 | BINFO is the active base equivalent of ORIG_BINFO in the inheritance | |
7042 | graph of T. Both BINFO and ORIG_BINFO will have the same BINFO_TYPE, | |
7043 | but are not necessarily the same in terms of layout. */ | |
ca36f057 MM |
7044 | |
7045 | static void | |
94edc4ab NN |
7046 | accumulate_vtbl_inits (tree binfo, |
7047 | tree orig_binfo, | |
7048 | tree rtti_binfo, | |
7049 | tree t, | |
7050 | tree inits) | |
ca36f057 | 7051 | { |
23656158 | 7052 | int i; |
9965d119 | 7053 | int ctor_vtbl_p = !same_type_p (BINFO_TYPE (rtti_binfo), t); |
23656158 MM |
7054 | |
7055 | my_friendly_assert (same_type_p (BINFO_TYPE (binfo), | |
7056 | BINFO_TYPE (orig_binfo)), | |
7057 | 20000517); | |
7058 | ||
00a17e31 | 7059 | /* If it doesn't have a vptr, we don't do anything. */ |
623fe76a NS |
7060 | if (!TYPE_CONTAINS_VPTR_P (BINFO_TYPE (binfo))) |
7061 | return; | |
7062 | ||
23656158 MM |
7063 | /* If we're building a construction vtable, we're not interested in |
7064 | subobjects that don't require construction vtables. */ | |
7065 | if (ctor_vtbl_p | |
9ccf6541 | 7066 | && !TYPE_USES_VIRTUAL_BASECLASSES (BINFO_TYPE (binfo)) |
9965d119 | 7067 | && !binfo_via_virtual (orig_binfo, BINFO_TYPE (rtti_binfo))) |
23656158 MM |
7068 | return; |
7069 | ||
7070 | /* Build the initializers for the BINFO-in-T vtable. */ | |
7071 | TREE_VALUE (inits) | |
7072 | = chainon (TREE_VALUE (inits), | |
7073 | dfs_accumulate_vtbl_inits (binfo, orig_binfo, | |
7074 | rtti_binfo, t, inits)); | |
7075 | ||
c35cce41 MM |
7076 | /* Walk the BINFO and its bases. We walk in preorder so that as we |
7077 | initialize each vtable we can figure out at what offset the | |
23656158 MM |
7078 | secondary vtable lies from the primary vtable. We can't use |
7079 | dfs_walk here because we need to iterate through bases of BINFO | |
7080 | and RTTI_BINFO simultaneously. */ | |
7081 | for (i = 0; i < BINFO_N_BASETYPES (binfo); ++i) | |
7082 | { | |
9965d119 NS |
7083 | tree base_binfo = BINFO_BASETYPE (binfo, i); |
7084 | ||
23656158 MM |
7085 | /* Skip virtual bases. */ |
7086 | if (TREE_VIA_VIRTUAL (base_binfo)) | |
7087 | continue; | |
7088 | accumulate_vtbl_inits (base_binfo, | |
7089 | BINFO_BASETYPE (orig_binfo, i), | |
9965d119 | 7090 | rtti_binfo, t, |
23656158 MM |
7091 | inits); |
7092 | } | |
ca36f057 MM |
7093 | } |
7094 | ||
3461fba7 NS |
7095 | /* Called from accumulate_vtbl_inits. Returns the initializers for |
7096 | the BINFO vtable. */ | |
ca36f057 MM |
7097 | |
7098 | static tree | |
94edc4ab NN |
7099 | dfs_accumulate_vtbl_inits (tree binfo, |
7100 | tree orig_binfo, | |
7101 | tree rtti_binfo, | |
7102 | tree t, | |
7103 | tree l) | |
ca36f057 | 7104 | { |
23656158 | 7105 | tree inits = NULL_TREE; |
9965d119 NS |
7106 | tree vtbl = NULL_TREE; |
7107 | int ctor_vtbl_p = !same_type_p (BINFO_TYPE (rtti_binfo), t); | |
7108 | ||
13de7ec4 JM |
7109 | if (ctor_vtbl_p |
7110 | && TREE_VIA_VIRTUAL (orig_binfo) && BINFO_PRIMARY_P (orig_binfo)) | |
9965d119 | 7111 | { |
13de7ec4 JM |
7112 | /* In the hierarchy of BINFO_TYPE (RTTI_BINFO), this is a |
7113 | primary virtual base. If it is not the same primary in | |
7114 | the hierarchy of T, we'll need to generate a ctor vtable | |
7115 | for it, to place at its location in T. If it is the same | |
7116 | primary, we still need a VTT entry for the vtable, but it | |
7117 | should point to the ctor vtable for the base it is a | |
7118 | primary for within the sub-hierarchy of RTTI_BINFO. | |
7bdcf888 | 7119 | |
13de7ec4 | 7120 | There are three possible cases: |
7bdcf888 | 7121 | |
13de7ec4 JM |
7122 | 1) We are in the same place. |
7123 | 2) We are a primary base within a lost primary virtual base of | |
7124 | RTTI_BINFO. | |
049d2def | 7125 | 3) We are primary to something not a base of RTTI_BINFO. */ |
7bdcf888 | 7126 | |
13de7ec4 JM |
7127 | tree b = BINFO_PRIMARY_BASE_OF (binfo); |
7128 | tree last = NULL_TREE; | |
85a9a0a2 | 7129 | |
13de7ec4 JM |
7130 | /* First, look through the bases we are primary to for RTTI_BINFO |
7131 | or a virtual base. */ | |
7132 | for (; b; b = BINFO_PRIMARY_BASE_OF (b)) | |
7bdcf888 | 7133 | { |
13de7ec4 JM |
7134 | last = b; |
7135 | if (TREE_VIA_VIRTUAL (b) || b == rtti_binfo) | |
7136 | break; | |
7bdcf888 | 7137 | } |
13de7ec4 JM |
7138 | /* If we run out of primary links, keep looking down our |
7139 | inheritance chain; we might be an indirect primary. */ | |
7140 | if (b == NULL_TREE) | |
7141 | for (b = last; b; b = BINFO_INHERITANCE_CHAIN (b)) | |
7142 | if (TREE_VIA_VIRTUAL (b) || b == rtti_binfo) | |
7143 | break; | |
7144 | ||
7145 | /* If we found RTTI_BINFO, this is case 1. If we found a virtual | |
7146 | base B and it is a base of RTTI_BINFO, this is case 2. In | |
7147 | either case, we share our vtable with LAST, i.e. the | |
7148 | derived-most base within B of which we are a primary. */ | |
7149 | if (b == rtti_binfo | |
dbbf88d1 NS |
7150 | || (b && purpose_member (BINFO_TYPE (b), |
7151 | CLASSTYPE_VBASECLASSES (BINFO_TYPE (rtti_binfo))))) | |
049d2def JM |
7152 | /* Just set our BINFO_VTABLE to point to LAST, as we may not have |
7153 | set LAST's BINFO_VTABLE yet. We'll extract the actual vptr in | |
7154 | binfo_ctor_vtable after everything's been set up. */ | |
7155 | vtbl = last; | |
13de7ec4 | 7156 | |
049d2def | 7157 | /* Otherwise, this is case 3 and we get our own. */ |
9965d119 | 7158 | } |
dbbf88d1 | 7159 | else if (!BINFO_NEW_VTABLE_MARKED (orig_binfo)) |
9965d119 | 7160 | return inits; |
7bdcf888 | 7161 | |
9965d119 | 7162 | if (!vtbl) |
ca36f057 | 7163 | { |
c35cce41 MM |
7164 | tree index; |
7165 | int non_fn_entries; | |
7166 | ||
7167 | /* Compute the initializer for this vtable. */ | |
23656158 | 7168 | inits = build_vtbl_initializer (binfo, orig_binfo, t, rtti_binfo, |
aabb4cd6 | 7169 | &non_fn_entries); |
c35cce41 | 7170 | |
23656158 | 7171 | /* Figure out the position to which the VPTR should point. */ |
c35cce41 MM |
7172 | vtbl = TREE_PURPOSE (l); |
7173 | vtbl = build1 (ADDR_EXPR, | |
23656158 | 7174 | vtbl_ptr_type_node, |
c35cce41 | 7175 | vtbl); |
90ecce3e | 7176 | TREE_CONSTANT (vtbl) = 1; |
c35cce41 MM |
7177 | index = size_binop (PLUS_EXPR, |
7178 | size_int (non_fn_entries), | |
7179 | size_int (list_length (TREE_VALUE (l)))); | |
23656158 MM |
7180 | index = size_binop (MULT_EXPR, |
7181 | TYPE_SIZE_UNIT (vtable_entry_type), | |
7182 | index); | |
7183 | vtbl = build (PLUS_EXPR, TREE_TYPE (vtbl), vtbl, index); | |
7184 | TREE_CONSTANT (vtbl) = 1; | |
9965d119 | 7185 | } |
23656158 | 7186 | |
7bdcf888 | 7187 | if (ctor_vtbl_p) |
9965d119 NS |
7188 | /* For a construction vtable, we can't overwrite BINFO_VTABLE. |
7189 | So, we make a TREE_LIST. Later, dfs_fixup_binfo_vtbls will | |
7190 | straighten this out. */ | |
7191 | BINFO_VTABLE (binfo) = tree_cons (rtti_binfo, vtbl, BINFO_VTABLE (binfo)); | |
7bdcf888 NS |
7192 | else if (BINFO_PRIMARY_P (binfo) && TREE_VIA_VIRTUAL (binfo)) |
7193 | inits = NULL_TREE; | |
7194 | else | |
7195 | /* For an ordinary vtable, set BINFO_VTABLE. */ | |
7196 | BINFO_VTABLE (binfo) = vtbl; | |
ca36f057 | 7197 | |
23656158 | 7198 | return inits; |
ca36f057 MM |
7199 | } |
7200 | ||
90ecce3e | 7201 | /* Construct the initializer for BINFO's virtual function table. BINFO |
aabb4cd6 | 7202 | is part of the hierarchy dominated by T. If we're building a |
23656158 | 7203 | construction vtable, the ORIG_BINFO is the binfo we should use to |
9965d119 NS |
7204 | find the actual function pointers to put in the vtable - but they |
7205 | can be overridden on the path to most-derived in the graph that | |
7206 | ORIG_BINFO belongs. Otherwise, | |
911a71a7 | 7207 | ORIG_BINFO should be the same as BINFO. The RTTI_BINFO is the |
23656158 MM |
7208 | BINFO that should be indicated by the RTTI information in the |
7209 | vtable; it will be a base class of T, rather than T itself, if we | |
7210 | are building a construction vtable. | |
aabb4cd6 MM |
7211 | |
7212 | The value returned is a TREE_LIST suitable for wrapping in a | |
7213 | CONSTRUCTOR to use as the DECL_INITIAL for a vtable. If | |
7214 | NON_FN_ENTRIES_P is not NULL, *NON_FN_ENTRIES_P is set to the | |
911a71a7 MM |
7215 | number of non-function entries in the vtable. |
7216 | ||
7217 | It might seem that this function should never be called with a | |
9965d119 | 7218 | BINFO for which BINFO_PRIMARY_P holds, the vtable for such a |
911a71a7 | 7219 | base is always subsumed by a derived class vtable. However, when |
9965d119 | 7220 | we are building construction vtables, we do build vtables for |
911a71a7 MM |
7221 | primary bases; we need these while the primary base is being |
7222 | constructed. */ | |
ca36f057 MM |
7223 | |
7224 | static tree | |
94edc4ab NN |
7225 | build_vtbl_initializer (tree binfo, |
7226 | tree orig_binfo, | |
7227 | tree t, | |
7228 | tree rtti_binfo, | |
7229 | int* non_fn_entries_p) | |
ca36f057 | 7230 | { |
d0cd8b44 | 7231 | tree v, b; |
911a71a7 | 7232 | tree vfun_inits; |
c35cce41 | 7233 | tree vbase; |
911a71a7 MM |
7234 | vtbl_init_data vid; |
7235 | ||
7236 | /* Initialize VID. */ | |
961192e1 | 7237 | memset (&vid, 0, sizeof (vid)); |
911a71a7 MM |
7238 | vid.binfo = binfo; |
7239 | vid.derived = t; | |
73ea87d7 | 7240 | vid.rtti_binfo = rtti_binfo; |
911a71a7 MM |
7241 | vid.last_init = &vid.inits; |
7242 | vid.primary_vtbl_p = (binfo == TYPE_BINFO (t)); | |
7243 | vid.ctor_vtbl_p = !same_type_p (BINFO_TYPE (rtti_binfo), t); | |
548502d3 | 7244 | vid.generate_vcall_entries = true; |
c35cce41 | 7245 | /* The first vbase or vcall offset is at index -3 in the vtable. */ |
a6f5e048 | 7246 | vid.index = ssize_int (-3 * TARGET_VTABLE_DATA_ENTRY_DISTANCE); |
c35cce41 | 7247 | |
9bab6c90 | 7248 | /* Add entries to the vtable for RTTI. */ |
73ea87d7 | 7249 | build_rtti_vtbl_entries (binfo, &vid); |
9bab6c90 | 7250 | |
b485e15b MM |
7251 | /* Create an array for keeping track of the functions we've |
7252 | processed. When we see multiple functions with the same | |
7253 | signature, we share the vcall offsets. */ | |
7254 | VARRAY_TREE_INIT (vid.fns, 32, "fns"); | |
c35cce41 | 7255 | /* Add the vcall and vbase offset entries. */ |
911a71a7 | 7256 | build_vcall_and_vbase_vtbl_entries (binfo, &vid); |
79cda2d1 | 7257 | /* Clear BINFO_VTABLE_PATH_MARKED; it's set by |
c35cce41 MM |
7258 | build_vbase_offset_vtbl_entries. */ |
7259 | for (vbase = CLASSTYPE_VBASECLASSES (t); | |
7260 | vbase; | |
7261 | vbase = TREE_CHAIN (vbase)) | |
dbbf88d1 | 7262 | BINFO_VTABLE_PATH_MARKED (TREE_VALUE (vbase)) = 0; |
ca36f057 | 7263 | |
a6f5e048 RH |
7264 | /* If the target requires padding between data entries, add that now. */ |
7265 | if (TARGET_VTABLE_DATA_ENTRY_DISTANCE > 1) | |
7266 | { | |
7267 | tree cur, *prev; | |
7268 | ||
7269 | for (prev = &vid.inits; (cur = *prev); prev = &TREE_CHAIN (cur)) | |
7270 | { | |
7271 | tree add = cur; | |
7272 | int i; | |
7273 | ||
7274 | for (i = 1; i < TARGET_VTABLE_DATA_ENTRY_DISTANCE; ++i) | |
7befdb9f | 7275 | add = tree_cons (NULL_TREE, |
2e88ae22 SE |
7276 | build1 (NOP_EXPR, vtable_entry_type, |
7277 | null_pointer_node), | |
7befdb9f | 7278 | add); |
a6f5e048 RH |
7279 | *prev = add; |
7280 | } | |
7281 | } | |
7282 | ||
c35cce41 | 7283 | if (non_fn_entries_p) |
911a71a7 | 7284 | *non_fn_entries_p = list_length (vid.inits); |
ca36f057 MM |
7285 | |
7286 | /* Go through all the ordinary virtual functions, building up | |
7287 | initializers. */ | |
c35cce41 | 7288 | vfun_inits = NULL_TREE; |
23656158 | 7289 | for (v = BINFO_VIRTUALS (orig_binfo); v; v = TREE_CHAIN (v)) |
ca36f057 MM |
7290 | { |
7291 | tree delta; | |
7292 | tree vcall_index; | |
4977bab6 | 7293 | tree fn, fn_original; |
f11ee281 | 7294 | tree init = NULL_TREE; |
73ea87d7 | 7295 | |
ca36f057 | 7296 | fn = BV_FN (v); |
07fa4878 NS |
7297 | fn_original = fn; |
7298 | if (DECL_THUNK_P (fn)) | |
4977bab6 | 7299 | { |
07fa4878 NS |
7300 | if (!DECL_NAME (fn)) |
7301 | finish_thunk (fn); | |
7302 | fn_original = THUNK_TARGET (fn); | |
4977bab6 ZW |
7303 | } |
7304 | ||
d0cd8b44 JM |
7305 | /* If the only definition of this function signature along our |
7306 | primary base chain is from a lost primary, this vtable slot will | |
7307 | never be used, so just zero it out. This is important to avoid | |
7308 | requiring extra thunks which cannot be generated with the function. | |
7309 | ||
f11ee281 JM |
7310 | We first check this in update_vtable_entry_for_fn, so we handle |
7311 | restored primary bases properly; we also need to do it here so we | |
7312 | zero out unused slots in ctor vtables, rather than filling themff | |
7313 | with erroneous values (though harmless, apart from relocation | |
7314 | costs). */ | |
7315 | for (b = binfo; ; b = get_primary_binfo (b)) | |
7316 | { | |
7317 | /* We found a defn before a lost primary; go ahead as normal. */ | |
4977bab6 | 7318 | if (look_for_overrides_here (BINFO_TYPE (b), fn_original)) |
f11ee281 JM |
7319 | break; |
7320 | ||
7321 | /* The nearest definition is from a lost primary; clear the | |
7322 | slot. */ | |
7323 | if (BINFO_LOST_PRIMARY_P (b)) | |
7324 | { | |
7325 | init = size_zero_node; | |
d0cd8b44 | 7326 | break; |
f11ee281 JM |
7327 | } |
7328 | } | |
d0cd8b44 | 7329 | |
f11ee281 JM |
7330 | if (! init) |
7331 | { | |
7332 | /* Pull the offset for `this', and the function to call, out of | |
7333 | the list. */ | |
7334 | delta = BV_DELTA (v); | |
548502d3 | 7335 | vcall_index = BV_VCALL_INDEX (v); |
f11ee281 JM |
7336 | |
7337 | my_friendly_assert (TREE_CODE (delta) == INTEGER_CST, 19990727); | |
7338 | my_friendly_assert (TREE_CODE (fn) == FUNCTION_DECL, 19990727); | |
7339 | ||
7340 | /* You can't call an abstract virtual function; it's abstract. | |
7341 | So, we replace these functions with __pure_virtual. */ | |
4977bab6 | 7342 | if (DECL_PURE_VIRTUAL_P (fn_original)) |
f11ee281 | 7343 | fn = abort_fndecl; |
bb5e8a7f | 7344 | else if (!integer_zerop (delta) || vcall_index) |
4977bab6 ZW |
7345 | { |
7346 | fn = make_thunk (fn, /*this_adjusting=*/1, delta, vcall_index); | |
7347 | if (!DECL_NAME (fn)) | |
07fa4878 | 7348 | finish_thunk (fn); |
4977bab6 | 7349 | } |
f11ee281 JM |
7350 | /* Take the address of the function, considering it to be of an |
7351 | appropriate generic type. */ | |
bb5e8a7f | 7352 | init = build1 (ADDR_EXPR, vfunc_ptr_type_node, fn); |
f11ee281 | 7353 | /* The address of a function can't change. */ |
bb5e8a7f | 7354 | TREE_CONSTANT (init) = 1; |
f11ee281 | 7355 | } |
d0cd8b44 | 7356 | |
ca36f057 | 7357 | /* And add it to the chain of initializers. */ |
67231816 RH |
7358 | if (TARGET_VTABLE_USES_DESCRIPTORS) |
7359 | { | |
7360 | int i; | |
7361 | if (init == size_zero_node) | |
7362 | for (i = 0; i < TARGET_VTABLE_USES_DESCRIPTORS; ++i) | |
7363 | vfun_inits = tree_cons (NULL_TREE, init, vfun_inits); | |
7364 | else | |
7365 | for (i = 0; i < TARGET_VTABLE_USES_DESCRIPTORS; ++i) | |
7366 | { | |
7367 | tree fdesc = build (FDESC_EXPR, vfunc_ptr_type_node, | |
7368 | TREE_OPERAND (init, 0), | |
7369 | build_int_2 (i, 0)); | |
7370 | TREE_CONSTANT (fdesc) = 1; | |
7371 | ||
7372 | vfun_inits = tree_cons (NULL_TREE, fdesc, vfun_inits); | |
7373 | } | |
7374 | } | |
7375 | else | |
7376 | vfun_inits = tree_cons (NULL_TREE, init, vfun_inits); | |
ca36f057 MM |
7377 | } |
7378 | ||
c35cce41 MM |
7379 | /* The initializers for virtual functions were built up in reverse |
7380 | order; straighten them out now. */ | |
7381 | vfun_inits = nreverse (vfun_inits); | |
7382 | ||
9bab6c90 | 7383 | /* The negative offset initializers are also in reverse order. */ |
911a71a7 | 7384 | vid.inits = nreverse (vid.inits); |
9bab6c90 MM |
7385 | |
7386 | /* Chain the two together. */ | |
911a71a7 | 7387 | return chainon (vid.inits, vfun_inits); |
ca36f057 MM |
7388 | } |
7389 | ||
d0cd8b44 | 7390 | /* Adds to vid->inits the initializers for the vbase and vcall |
c35cce41 | 7391 | offsets in BINFO, which is in the hierarchy dominated by T. */ |
ca36f057 | 7392 | |
c35cce41 | 7393 | static void |
94edc4ab | 7394 | build_vcall_and_vbase_vtbl_entries (tree binfo, vtbl_init_data* vid) |
ca36f057 | 7395 | { |
c35cce41 | 7396 | tree b; |
8d08fdba | 7397 | |
c35cce41 | 7398 | /* If this is a derived class, we must first create entries |
9bab6c90 | 7399 | corresponding to the primary base class. */ |
911a71a7 | 7400 | b = get_primary_binfo (binfo); |
c35cce41 | 7401 | if (b) |
911a71a7 | 7402 | build_vcall_and_vbase_vtbl_entries (b, vid); |
c35cce41 MM |
7403 | |
7404 | /* Add the vbase entries for this base. */ | |
911a71a7 | 7405 | build_vbase_offset_vtbl_entries (binfo, vid); |
c35cce41 | 7406 | /* Add the vcall entries for this base. */ |
911a71a7 | 7407 | build_vcall_offset_vtbl_entries (binfo, vid); |
ca36f057 | 7408 | } |
8d08fdba | 7409 | |
ca36f057 MM |
7410 | /* Returns the initializers for the vbase offset entries in the vtable |
7411 | for BINFO (which is part of the class hierarchy dominated by T), in | |
c35cce41 MM |
7412 | reverse order. VBASE_OFFSET_INDEX gives the vtable index |
7413 | where the next vbase offset will go. */ | |
8d08fdba | 7414 | |
c35cce41 | 7415 | static void |
94edc4ab | 7416 | build_vbase_offset_vtbl_entries (tree binfo, vtbl_init_data* vid) |
ca36f057 | 7417 | { |
c35cce41 MM |
7418 | tree vbase; |
7419 | tree t; | |
90b1ca2f | 7420 | tree non_primary_binfo; |
8d08fdba | 7421 | |
ca36f057 MM |
7422 | /* If there are no virtual baseclasses, then there is nothing to |
7423 | do. */ | |
7424 | if (!TYPE_USES_VIRTUAL_BASECLASSES (BINFO_TYPE (binfo))) | |
c35cce41 | 7425 | return; |
ca36f057 | 7426 | |
911a71a7 | 7427 | t = vid->derived; |
90b1ca2f NS |
7428 | |
7429 | /* We might be a primary base class. Go up the inheritance hierarchy | |
7430 | until we find the most derived class of which we are a primary base: | |
7431 | it is the offset of that which we need to use. */ | |
7432 | non_primary_binfo = binfo; | |
7433 | while (BINFO_INHERITANCE_CHAIN (non_primary_binfo)) | |
7434 | { | |
7435 | tree b; | |
7436 | ||
7437 | /* If we have reached a virtual base, then it must be a primary | |
7438 | base (possibly multi-level) of vid->binfo, or we wouldn't | |
7439 | have called build_vcall_and_vbase_vtbl_entries for it. But it | |
7440 | might be a lost primary, so just skip down to vid->binfo. */ | |
7441 | if (TREE_VIA_VIRTUAL (non_primary_binfo)) | |
7442 | { | |
7443 | non_primary_binfo = vid->binfo; | |
7444 | break; | |
7445 | } | |
7446 | ||
7447 | b = BINFO_INHERITANCE_CHAIN (non_primary_binfo); | |
7448 | if (get_primary_binfo (b) != non_primary_binfo) | |
7449 | break; | |
7450 | non_primary_binfo = b; | |
7451 | } | |
ca36f057 | 7452 | |
c35cce41 MM |
7453 | /* Go through the virtual bases, adding the offsets. */ |
7454 | for (vbase = TYPE_BINFO (BINFO_TYPE (binfo)); | |
7455 | vbase; | |
7456 | vbase = TREE_CHAIN (vbase)) | |
7457 | { | |
7458 | tree b; | |
7459 | tree delta; | |
7460 | ||
7461 | if (!TREE_VIA_VIRTUAL (vbase)) | |
7462 | continue; | |
ca36f057 | 7463 | |
c35cce41 MM |
7464 | /* Find the instance of this virtual base in the complete |
7465 | object. */ | |
dbbf88d1 | 7466 | b = copied_binfo (vbase, binfo); |
c35cce41 MM |
7467 | |
7468 | /* If we've already got an offset for this virtual base, we | |
7469 | don't need another one. */ | |
7470 | if (BINFO_VTABLE_PATH_MARKED (b)) | |
7471 | continue; | |
dbbf88d1 | 7472 | BINFO_VTABLE_PATH_MARKED (b) = 1; |
c35cce41 MM |
7473 | |
7474 | /* Figure out where we can find this vbase offset. */ | |
7475 | delta = size_binop (MULT_EXPR, | |
911a71a7 | 7476 | vid->index, |
c35cce41 MM |
7477 | convert (ssizetype, |
7478 | TYPE_SIZE_UNIT (vtable_entry_type))); | |
911a71a7 | 7479 | if (vid->primary_vtbl_p) |
c35cce41 MM |
7480 | BINFO_VPTR_FIELD (b) = delta; |
7481 | ||
7482 | if (binfo != TYPE_BINFO (t)) | |
7483 | { | |
c35cce41 | 7484 | /* The vbase offset had better be the same. */ |
dbbf88d1 NS |
7485 | my_friendly_assert (tree_int_cst_equal (delta, |
7486 | BINFO_VPTR_FIELD (vbase)), | |
7487 | 20030202); | |
c35cce41 MM |
7488 | } |
7489 | ||
7490 | /* The next vbase will come at a more negative offset. */ | |
a6f5e048 RH |
7491 | vid->index = size_binop (MINUS_EXPR, vid->index, |
7492 | ssize_int (TARGET_VTABLE_DATA_ENTRY_DISTANCE)); | |
c35cce41 MM |
7493 | |
7494 | /* The initializer is the delta from BINFO to this virtual base. | |
4e7512c9 MM |
7495 | The vbase offsets go in reverse inheritance-graph order, and |
7496 | we are walking in inheritance graph order so these end up in | |
7497 | the right order. */ | |
90b1ca2f NS |
7498 | delta = size_diffop (BINFO_OFFSET (b), BINFO_OFFSET (non_primary_binfo)); |
7499 | ||
911a71a7 | 7500 | *vid->last_init |
9bab6c90 MM |
7501 | = build_tree_list (NULL_TREE, |
7502 | fold (build1 (NOP_EXPR, | |
7503 | vtable_entry_type, | |
7504 | delta))); | |
911a71a7 | 7505 | vid->last_init = &TREE_CHAIN (*vid->last_init); |
c35cce41 | 7506 | } |
8d08fdba | 7507 | } |
ca36f057 | 7508 | |
b485e15b | 7509 | /* Adds the initializers for the vcall offset entries in the vtable |
d0cd8b44 JM |
7510 | for BINFO (which is part of the class hierarchy dominated by VID->DERIVED) |
7511 | to VID->INITS. */ | |
b485e15b MM |
7512 | |
7513 | static void | |
94edc4ab | 7514 | build_vcall_offset_vtbl_entries (tree binfo, vtbl_init_data* vid) |
b485e15b | 7515 | { |
548502d3 MM |
7516 | /* We only need these entries if this base is a virtual base. We |
7517 | compute the indices -- but do not add to the vtable -- when | |
7518 | building the main vtable for a class. */ | |
7519 | if (TREE_VIA_VIRTUAL (binfo) || binfo == TYPE_BINFO (vid->derived)) | |
7520 | { | |
7521 | /* We need a vcall offset for each of the virtual functions in this | |
7522 | vtable. For example: | |
b485e15b | 7523 | |
548502d3 MM |
7524 | class A { virtual void f (); }; |
7525 | class B1 : virtual public A { virtual void f (); }; | |
7526 | class B2 : virtual public A { virtual void f (); }; | |
7527 | class C: public B1, public B2 { virtual void f (); }; | |
d0cd8b44 | 7528 | |
548502d3 MM |
7529 | A C object has a primary base of B1, which has a primary base of A. A |
7530 | C also has a secondary base of B2, which no longer has a primary base | |
7531 | of A. So the B2-in-C construction vtable needs a secondary vtable for | |
7532 | A, which will adjust the A* to a B2* to call f. We have no way of | |
7533 | knowing what (or even whether) this offset will be when we define B2, | |
7534 | so we store this "vcall offset" in the A sub-vtable and look it up in | |
7535 | a "virtual thunk" for B2::f. | |
b485e15b | 7536 | |
548502d3 MM |
7537 | We need entries for all the functions in our primary vtable and |
7538 | in our non-virtual bases' secondary vtables. */ | |
7539 | vid->vbase = binfo; | |
7540 | /* If we are just computing the vcall indices -- but do not need | |
7541 | the actual entries -- not that. */ | |
7542 | if (!TREE_VIA_VIRTUAL (binfo)) | |
7543 | vid->generate_vcall_entries = false; | |
7544 | /* Now, walk through the non-virtual bases, adding vcall offsets. */ | |
7545 | add_vcall_offset_vtbl_entries_r (binfo, vid); | |
7546 | } | |
b485e15b MM |
7547 | } |
7548 | ||
7549 | /* Build vcall offsets, starting with those for BINFO. */ | |
7550 | ||
7551 | static void | |
94edc4ab | 7552 | add_vcall_offset_vtbl_entries_r (tree binfo, vtbl_init_data* vid) |
b485e15b MM |
7553 | { |
7554 | int i; | |
7555 | tree primary_binfo; | |
7556 | ||
7557 | /* Don't walk into virtual bases -- except, of course, for the | |
d0cd8b44 JM |
7558 | virtual base for which we are building vcall offsets. Any |
7559 | primary virtual base will have already had its offsets generated | |
7560 | through the recursion in build_vcall_and_vbase_vtbl_entries. */ | |
b485e15b MM |
7561 | if (TREE_VIA_VIRTUAL (binfo) && vid->vbase != binfo) |
7562 | return; | |
7563 | ||
7564 | /* If BINFO has a primary base, process it first. */ | |
7565 | primary_binfo = get_primary_binfo (binfo); | |
7566 | if (primary_binfo) | |
7567 | add_vcall_offset_vtbl_entries_r (primary_binfo, vid); | |
7568 | ||
7569 | /* Add BINFO itself to the list. */ | |
7570 | add_vcall_offset_vtbl_entries_1 (binfo, vid); | |
7571 | ||
7572 | /* Scan the non-primary bases of BINFO. */ | |
7573 | for (i = 0; i < BINFO_N_BASETYPES (binfo); ++i) | |
7574 | { | |
7575 | tree base_binfo; | |
7576 | ||
7577 | base_binfo = BINFO_BASETYPE (binfo, i); | |
7578 | if (base_binfo != primary_binfo) | |
7579 | add_vcall_offset_vtbl_entries_r (base_binfo, vid); | |
7580 | } | |
7581 | } | |
7582 | ||
9965d119 | 7583 | /* Called from build_vcall_offset_vtbl_entries_r. */ |
e92cc029 | 7584 | |
b485e15b | 7585 | static void |
94edc4ab | 7586 | add_vcall_offset_vtbl_entries_1 (tree binfo, vtbl_init_data* vid) |
8d08fdba | 7587 | { |
e6a66567 MM |
7588 | /* Make entries for the rest of the virtuals. */ |
7589 | if (abi_version_at_least (2)) | |
31f8e4f3 | 7590 | { |
e6a66567 | 7591 | tree orig_fn; |
911a71a7 | 7592 | |
e6a66567 MM |
7593 | /* The ABI requires that the methods be processed in declaration |
7594 | order. G++ 3.2 used the order in the vtable. */ | |
7595 | for (orig_fn = TYPE_METHODS (BINFO_TYPE (binfo)); | |
7596 | orig_fn; | |
7597 | orig_fn = TREE_CHAIN (orig_fn)) | |
7598 | if (DECL_VINDEX (orig_fn)) | |
95675950 | 7599 | add_vcall_offset (orig_fn, binfo, vid); |
e6a66567 MM |
7600 | } |
7601 | else | |
7602 | { | |
7603 | tree derived_virtuals; | |
7604 | tree base_virtuals; | |
7605 | tree orig_virtuals; | |
7606 | /* If BINFO is a primary base, the most derived class which has | |
7607 | BINFO as a primary base; otherwise, just BINFO. */ | |
7608 | tree non_primary_binfo; | |
7609 | ||
7610 | /* We might be a primary base class. Go up the inheritance hierarchy | |
7611 | until we find the most derived class of which we are a primary base: | |
7612 | it is the BINFO_VIRTUALS there that we need to consider. */ | |
7613 | non_primary_binfo = binfo; | |
7614 | while (BINFO_INHERITANCE_CHAIN (non_primary_binfo)) | |
911a71a7 | 7615 | { |
e6a66567 MM |
7616 | tree b; |
7617 | ||
7618 | /* If we have reached a virtual base, then it must be vid->vbase, | |
7619 | because we ignore other virtual bases in | |
7620 | add_vcall_offset_vtbl_entries_r. In turn, it must be a primary | |
7621 | base (possibly multi-level) of vid->binfo, or we wouldn't | |
7622 | have called build_vcall_and_vbase_vtbl_entries for it. But it | |
7623 | might be a lost primary, so just skip down to vid->binfo. */ | |
7624 | if (TREE_VIA_VIRTUAL (non_primary_binfo)) | |
7625 | { | |
7626 | if (non_primary_binfo != vid->vbase) | |
7627 | abort (); | |
7628 | non_primary_binfo = vid->binfo; | |
7629 | break; | |
7630 | } | |
911a71a7 | 7631 | |
e6a66567 MM |
7632 | b = BINFO_INHERITANCE_CHAIN (non_primary_binfo); |
7633 | if (get_primary_binfo (b) != non_primary_binfo) | |
7634 | break; | |
7635 | non_primary_binfo = b; | |
7636 | } | |
4e7512c9 | 7637 | |
e6a66567 MM |
7638 | if (vid->ctor_vtbl_p) |
7639 | /* For a ctor vtable we need the equivalent binfo within the hierarchy | |
7640 | where rtti_binfo is the most derived type. */ | |
dbbf88d1 NS |
7641 | non_primary_binfo |
7642 | = original_binfo (non_primary_binfo, vid->rtti_binfo); | |
e6a66567 MM |
7643 | |
7644 | for (base_virtuals = BINFO_VIRTUALS (binfo), | |
7645 | derived_virtuals = BINFO_VIRTUALS (non_primary_binfo), | |
7646 | orig_virtuals = BINFO_VIRTUALS (TYPE_BINFO (BINFO_TYPE (binfo))); | |
7647 | base_virtuals; | |
7648 | base_virtuals = TREE_CHAIN (base_virtuals), | |
7649 | derived_virtuals = TREE_CHAIN (derived_virtuals), | |
7650 | orig_virtuals = TREE_CHAIN (orig_virtuals)) | |
7651 | { | |
7652 | tree orig_fn; | |
73ea87d7 | 7653 | |
e6a66567 MM |
7654 | /* Find the declaration that originally caused this function to |
7655 | be present in BINFO_TYPE (binfo). */ | |
7656 | orig_fn = BV_FN (orig_virtuals); | |
9bab6c90 | 7657 | |
e6a66567 MM |
7658 | /* When processing BINFO, we only want to generate vcall slots for |
7659 | function slots introduced in BINFO. So don't try to generate | |
7660 | one if the function isn't even defined in BINFO. */ | |
7661 | if (!same_type_p (DECL_CONTEXT (orig_fn), BINFO_TYPE (binfo))) | |
7662 | continue; | |
b485e15b | 7663 | |
95675950 | 7664 | add_vcall_offset (orig_fn, binfo, vid); |
e6a66567 MM |
7665 | } |
7666 | } | |
7667 | } | |
b485e15b | 7668 | |
95675950 | 7669 | /* Add a vcall offset entry for ORIG_FN to the vtable. */ |
b485e15b | 7670 | |
e6a66567 | 7671 | static void |
95675950 | 7672 | add_vcall_offset (tree orig_fn, tree binfo, vtbl_init_data *vid) |
e6a66567 MM |
7673 | { |
7674 | size_t i; | |
7675 | tree vcall_offset; | |
9bab6c90 | 7676 | |
e6a66567 MM |
7677 | /* If there is already an entry for a function with the same |
7678 | signature as FN, then we do not need a second vcall offset. | |
7679 | Check the list of functions already present in the derived | |
7680 | class vtable. */ | |
7681 | for (i = 0; i < VARRAY_ACTIVE_SIZE (vid->fns); ++i) | |
7682 | { | |
7683 | tree derived_entry; | |
aabb4cd6 | 7684 | |
e6a66567 MM |
7685 | derived_entry = VARRAY_TREE (vid->fns, i); |
7686 | if (same_signature_p (derived_entry, orig_fn) | |
7687 | /* We only use one vcall offset for virtual destructors, | |
7688 | even though there are two virtual table entries. */ | |
7689 | || (DECL_DESTRUCTOR_P (derived_entry) | |
7690 | && DECL_DESTRUCTOR_P (orig_fn))) | |
7691 | return; | |
7692 | } | |
4e7512c9 | 7693 | |
e6a66567 MM |
7694 | /* If we are building these vcall offsets as part of building |
7695 | the vtable for the most derived class, remember the vcall | |
7696 | offset. */ | |
7697 | if (vid->binfo == TYPE_BINFO (vid->derived)) | |
7698 | CLASSTYPE_VCALL_INDICES (vid->derived) | |
7699 | = tree_cons (orig_fn, vid->index, | |
7700 | CLASSTYPE_VCALL_INDICES (vid->derived)); | |
548502d3 | 7701 | |
e6a66567 MM |
7702 | /* The next vcall offset will be found at a more negative |
7703 | offset. */ | |
7704 | vid->index = size_binop (MINUS_EXPR, vid->index, | |
7705 | ssize_int (TARGET_VTABLE_DATA_ENTRY_DISTANCE)); | |
7706 | ||
7707 | /* Keep track of this function. */ | |
7708 | VARRAY_PUSH_TREE (vid->fns, orig_fn); | |
7709 | ||
7710 | if (vid->generate_vcall_entries) | |
7711 | { | |
7712 | tree base; | |
e6a66567 | 7713 | tree fn; |
548502d3 | 7714 | |
e6a66567 | 7715 | /* Find the overriding function. */ |
95675950 | 7716 | fn = find_final_overrider (vid->rtti_binfo, binfo, orig_fn); |
e6a66567 MM |
7717 | if (fn == error_mark_node) |
7718 | vcall_offset = build1 (NOP_EXPR, vtable_entry_type, | |
7719 | integer_zero_node); | |
7720 | else | |
7721 | { | |
95675950 MM |
7722 | base = TREE_VALUE (fn); |
7723 | ||
7724 | /* The vbase we're working on is a primary base of | |
7725 | vid->binfo. But it might be a lost primary, so its | |
7726 | BINFO_OFFSET might be wrong, so we just use the | |
7727 | BINFO_OFFSET from vid->binfo. */ | |
7728 | vcall_offset = size_diffop (BINFO_OFFSET (base), | |
7729 | BINFO_OFFSET (vid->binfo)); | |
548502d3 MM |
7730 | vcall_offset = fold (build1 (NOP_EXPR, vtable_entry_type, |
7731 | vcall_offset)); | |
548502d3 | 7732 | } |
34cd5ae7 | 7733 | /* Add the initializer to the vtable. */ |
e6a66567 MM |
7734 | *vid->last_init = build_tree_list (NULL_TREE, vcall_offset); |
7735 | vid->last_init = &TREE_CHAIN (*vid->last_init); | |
c35cce41 | 7736 | } |
570221c2 | 7737 | } |
b54ccf71 | 7738 | |
34cd5ae7 | 7739 | /* Return vtbl initializers for the RTTI entries corresponding to the |
aabb4cd6 | 7740 | BINFO's vtable. The RTTI entries should indicate the object given |
73ea87d7 | 7741 | by VID->rtti_binfo. */ |
b54ccf71 | 7742 | |
9bab6c90 | 7743 | static void |
94edc4ab | 7744 | build_rtti_vtbl_entries (tree binfo, vtbl_init_data* vid) |
b54ccf71 | 7745 | { |
ca36f057 | 7746 | tree b; |
aabb4cd6 | 7747 | tree t; |
ca36f057 | 7748 | tree basetype; |
ca36f057 MM |
7749 | tree offset; |
7750 | tree decl; | |
7751 | tree init; | |
b54ccf71 | 7752 | |
ca36f057 | 7753 | basetype = BINFO_TYPE (binfo); |
73ea87d7 | 7754 | t = BINFO_TYPE (vid->rtti_binfo); |
b54ccf71 | 7755 | |
ca36f057 MM |
7756 | /* To find the complete object, we will first convert to our most |
7757 | primary base, and then add the offset in the vtbl to that value. */ | |
7758 | b = binfo; | |
9965d119 NS |
7759 | while (CLASSTYPE_HAS_PRIMARY_BASE_P (BINFO_TYPE (b)) |
7760 | && !BINFO_LOST_PRIMARY_P (b)) | |
b54ccf71 | 7761 | { |
c35cce41 MM |
7762 | tree primary_base; |
7763 | ||
911a71a7 | 7764 | primary_base = get_primary_binfo (b); |
9965d119 | 7765 | my_friendly_assert (BINFO_PRIMARY_BASE_OF (primary_base) == b, 20010127); |
c35cce41 | 7766 | b = primary_base; |
b54ccf71 | 7767 | } |
73ea87d7 | 7768 | offset = size_diffop (BINFO_OFFSET (vid->rtti_binfo), BINFO_OFFSET (b)); |
8f032717 | 7769 | |
8fa33dfa MM |
7770 | /* The second entry is the address of the typeinfo object. */ |
7771 | if (flag_rtti) | |
7993382e | 7772 | decl = build_address (get_tinfo_decl (t)); |
ca36f057 | 7773 | else |
8fa33dfa MM |
7774 | decl = integer_zero_node; |
7775 | ||
7776 | /* Convert the declaration to a type that can be stored in the | |
7777 | vtable. */ | |
7993382e | 7778 | init = build_nop (vfunc_ptr_type_node, decl); |
911a71a7 MM |
7779 | *vid->last_init = build_tree_list (NULL_TREE, init); |
7780 | vid->last_init = &TREE_CHAIN (*vid->last_init); | |
8f032717 | 7781 | |
c35cce41 | 7782 | /* Add the offset-to-top entry. It comes earlier in the vtable that |
c4372ef4 NS |
7783 | the the typeinfo entry. Convert the offset to look like a |
7784 | function pointer, so that we can put it in the vtable. */ | |
7993382e | 7785 | init = build_nop (vfunc_ptr_type_node, offset); |
c4372ef4 NS |
7786 | *vid->last_init = build_tree_list (NULL_TREE, init); |
7787 | vid->last_init = &TREE_CHAIN (*vid->last_init); | |
8f032717 | 7788 | } |